Of course, not just lifting must be perpendicular to the port
bridge gantry crane s, as well as various types of quay cranes and other lifting machinery is so. About a dozen non-lifting cranes, etc., do not know we are not clear? If in doubt, have the opportunity to work with you on it. One of them is not hanging ten: not allowed oblique oblique hanging. There may be some specific reasons people do not quite understand, analyze here with us, so that we can truly understand, remember it from the heart, to ensure the safety of construction operations.
1, oblique hanging may overload
Assuming the weight lifted from the ground as Q of objects, vertical lifting, rope tension is equal to Q S as long as or slightly larger than Q, the weight can leave the ground.
However, if the oblique, and the ground wire to the vertical at an angle. According to mechanics, the role of the tension on the rope S, so that the object can be decomposed into a vertical upward force P and the horizontal movement of the force F, to make the object hanging from the ground, P at least equal to Q. F same as the angle increases. That is,overhead bridge crane the larger the angle oblique hanging in the lifting heavy objects the same time the greater the force rope. So, if a full load when lifting heavy objects vertically, then diagonally hanging inevitable when overload occurs even rope pulled off by accident.
2, oblique hanging produce inertial forces dling personnel
In addition, the oblique hanging horizontal force generated when the F, when the heavy left front also subject to the effects of friction. After leaving the ground a moment, would object to the vertical center of the swing, it is possible and hang hanging personnel, operations personnel, or other objects around the jostling caused by accidents.
Therefore, these two aspects, the oblique oblique lifting
overhead gantry crane is absolutely not allowed, making sure the goods required when lifting vertically.
For all types of large construction machinery, every detail needs to be done very close to perfection, this is the basis for future development!
2013年9月8日星期日
Wharf crane operation three small dots Precautions
Today begins the pier quay
hoist gantry crane outside many occasions together, in order to ensure safe operation, afar as we propose three small dots requirements, to help you while avoiding disadvantages, better use of crane equipment.
1, lifting site selection should be appropriate
Operation should be smooth lifting spacious venue selection, ease of accidents, the timely evacuation of danger zones.
2, the lifting process should establish stable fixed point
To confirm the operation, stable foothold: standing mechanical equipment and lifting objects stacked,overhead gantry crane you should pay attention to the foot without slipping and tripping hazards.
3, lifting position should avoid harmful
Operation should avoid the loss of ability to function in the direction as lifting heavy objects that could fall in operation or slipped, asymmetrical lifting will produce a swing and rotation, hanging objects running there kinetic energy. Therefore, the operator hung suspended in the need to avoid the attention and directing these harmful orientation.
Wharf overhead bridge crane operation errors caused by security incidents are not uncommon, we must not empirically work, pay more attention to the operation is an effective means of avoiding accidents.
1, lifting site selection should be appropriate
Operation should be smooth lifting spacious venue selection, ease of accidents, the timely evacuation of danger zones.
2, the lifting process should establish stable fixed point
To confirm the operation, stable foothold: standing mechanical equipment and lifting objects stacked,overhead gantry crane you should pay attention to the foot without slipping and tripping hazards.
3, lifting position should avoid harmful
Operation should avoid the loss of ability to function in the direction as lifting heavy objects that could fall in operation or slipped, asymmetrical lifting will produce a swing and rotation, hanging objects running there kinetic energy. Therefore, the operator hung suspended in the need to avoid the attention and directing these harmful orientation.
Wharf overhead bridge crane operation errors caused by security incidents are not uncommon, we must not empirically work, pay more attention to the operation is an effective means of avoiding accidents.
Crane Hydraulic System Attention five-point problem
At present, China is basically a hydraulic
overhead bridge crane as their motivation to work, so there are many internal parts of the crane hydraulics. The normal operation of the hydraulic unit is the basic crane working key. Therefore, if there is no operation and maintenance in accordance with prescribed rules, on the one hand, causing the crane does not work properly run. On the other hand, may also greatly reduce engine life. Therefore, in our daily work operations, you should look at five questions:
First, we work, we must first check the mailbox crane hydraulic oil is not adequate, if not enough, it should be added immediately. In addition, the refueling time, we must proceed from a strainer to join, but can not add other brands of hydraulic oil;
Second, the oil filter cartridge job almost ten days or so, it shall be checked, if necessary to carry out cleaning and replacement;
Third, the hydraulic tank fifteen days will put out the oil from below and remove impurities. In addition, when the overhead gantry crane work for a year, I want to replace all the hydraulic oil tank.
Fourth, there are many crane hydraulics valve is not the same as they had before the manufacturing factory after various experiments tune just the flow and pressure when in operation do not easily rotated, so as to avoid the machine failure.
Fifth, after each job, remember to clean the hydraulic unit.
steel cranes need our routine maintenance when the job should comply professional charters to avoid some of the accidents.
First, we work, we must first check the mailbox crane hydraulic oil is not adequate, if not enough, it should be added immediately. In addition, the refueling time, we must proceed from a strainer to join, but can not add other brands of hydraulic oil;
Second, the oil filter cartridge job almost ten days or so, it shall be checked, if necessary to carry out cleaning and replacement;
Third, the hydraulic tank fifteen days will put out the oil from below and remove impurities. In addition, when the overhead gantry crane work for a year, I want to replace all the hydraulic oil tank.
Fourth, there are many crane hydraulics valve is not the same as they had before the manufacturing factory after various experiments tune just the flow and pressure when in operation do not easily rotated, so as to avoid the machine failure.
Fifth, after each job, remember to clean the hydraulic unit.
steel cranes need our routine maintenance when the job should comply professional charters to avoid some of the accidents.
2013年8月30日星期五
Crane fault diagnosis technology development
Various types of
hoist gantry crane state detection and fault diagnosis of electronic technology applications and the development of electronic technology Wei maturing and advanced . By the relay , contactor auxiliary chain connector , limit switch indicator consisting of a simple fault detection developed to specifically fault diagnosis system . Especially in the modern port of bulk and container loading dock harbor cranes, automated handling systems with improved performance , lifting the growing complexity of loading and unloading operations in order to improve the efficiency and reliability of lifting machinery , maintenance and effective utilization , try lifting downtime rate is reduced to minimum. The past 10 years , at home and abroad continue to develop and apply the port handling system RAS ( reliability , effective utilization , maintenance ) overall performance of the technology . In the automation system using "distributed " means of control for each device to take measures to improve the overall performance of RAS . The
overhead gantry crane motor control system , the programmable logic controller (PC), the data transmission device and the velocity modulation of the three components are used rigorous diagnostic measures and monitoring software reliability . In the system design , set back-up facilities and specialized diagnostic equipment monitoring .
Crane fault diagnostic testing device uses a microprocessor for data acquisition and processing , to achieve the lifting equipment and wiring fault detection , diagnosis and management of job records . Loading bridge microcomputers and computer in the control room via fiber optic cable linking the data can be easily transmitted the communication of information and instructions . MCMS systems often detect electrical transmission line is normal , at any time of the electrical equipment of the analog signal and digital signal switching record , and the detected value and the normal value is compared to determine whether there is failure , if failure occurs in the driver's cab CRT on the display , while the display the results printed out. After a fault occurs , the rapid tracking and detection of point of failure where they are. From the CRT display can be seen at a glance time curve shows the point of failure. Also can put the life of the various components , replacement time , repair time storage, display, print out, providing maintenance and repair information overhead bridge crane parts .
Crane fault diagnostic testing device uses a microprocessor for data acquisition and processing , to achieve the lifting equipment and wiring fault detection , diagnosis and management of job records . Loading bridge microcomputers and computer in the control room via fiber optic cable linking the data can be easily transmitted the communication of information and instructions . MCMS systems often detect electrical transmission line is normal , at any time of the electrical equipment of the analog signal and digital signal switching record , and the detected value and the normal value is compared to determine whether there is failure , if failure occurs in the driver's cab CRT on the display , while the display the results printed out. After a fault occurs , the rapid tracking and detection of point of failure where they are. From the CRT display can be seen at a glance time curve shows the point of failure. Also can put the life of the various components , replacement time , repair time storage, display, print out, providing maintenance and repair information overhead bridge crane parts .
2013年8月29日星期四
Quick off the Chinese equipment manufacturing
The scale of China's equipment manufacturing industry has leapt to the world, including a number of enterprises to enter the world's leading ranks .overhead gantry crane Equipment manufacturing industry known as " the mother of industry " in the country to promote the industrialization process plays an important role . The rapid take-off of China's equipment manufacturing industry , thanks to the national strategy , the key is to take the road of innovation . The rapid take-off equipment manufacturing , manufacturing in China will shift from the manufacturing powerhouse to lay a solid foundation. Starting today , the newspaper launched the " quick take-off of China's equipment manufacturing industry ," a series of reports , analysis of China's equipment manufacturing rapid take-off path , in-depth interpretation of China 's successful experience in enterprise innovation and development , so stay tuned .
" The mother of industry " off significant
The rapid take-off of China's equipment manufacturing industry has become a worldwide topic. In July, a U.S. consulting firm released a research report , " Chinese equipment manufacturing enterprises in some areas have achieved rapid success , and now the world's top five companies , at least one is in China ."
In fact , as early as 2009 , China's machinery equipment industry sales have reached $ 1.5 trillion , more than Japan 's $ 1.2 trillion and U.S. $ 1 trillion , ranking first in the world .
Equipment manufacturing industry known as " the mother of industry ," is for the provision of technical equipment SECTOR strategic industries, industries associated with high , is the industry industrial upgrading , technological progress and an important guarantee for the concentrated expression of the comprehensive national strength . Chinese manufacturing power shift from manufacturing country ,overhead bridge crane we first need the equipment manufacturing industry to take off .
In today's world power and both are power equipment manufacturing industry in the process of industrialization rely on the equipment manufacturing industry led. Japan had called the electromechanical industry leading sectors of economic take-off , as the improvement of national welfare "engine industry ." 20th century, the rise of information technology, nuclear technology, space technology , and both are created through equipment manufacturing industry .
Effectiveness of China's industrial structure adjustment, industrial level smooth upgrade, which depends largely on whether the equipment manufacturing sectors of the national economy to provide advanced , complete technical equipment .
In the 21st century, the industrial countries will put more priority to developing the equipment manufacturing industry strategic position . In recent years , the United States and other industrialized countries the proportion of manufacturing equipment manufacturing accounted for more than 40% , the emerging industrial countries more than 30% , and showed a rising trend .
"Eleventh Five-Year" period, China's equipment manufacturing industry is developing rapidly. Ministry of Industry and Information Technology data show that from 2006 to 2010 , average annual growth rate of industrial added value of China's equipment more than 25% . In 2010, the country's total industrial added value the industry accounted for more than 9% of GDP , accounting for 19.35% of all industry .
From the size of the current point of view, China's equipment manufacturing industry has leapt to the world. In radio communications , solar panels , coal and other industries, China has a number of enterprises have entered the world leader in the column. Some foreign media that the challenger from China is reshaping the global industry structure ,steel crane made in China are climbing up the value chain .
In the October 18, 2010 release of " The State Council on accelerating the development and development of strategic emerging industries decision" to determine the high-end equipment manufacturing industry as China's current focus on fostering and development of strategic emerging industries, will develop into 2020 pillar industries.
" The mother of industry " off significant
The rapid take-off of China's equipment manufacturing industry has become a worldwide topic. In July, a U.S. consulting firm released a research report , " Chinese equipment manufacturing enterprises in some areas have achieved rapid success , and now the world's top five companies , at least one is in China ."
In fact , as early as 2009 , China's machinery equipment industry sales have reached $ 1.5 trillion , more than Japan 's $ 1.2 trillion and U.S. $ 1 trillion , ranking first in the world .
Equipment manufacturing industry known as " the mother of industry ," is for the provision of technical equipment SECTOR strategic industries, industries associated with high , is the industry industrial upgrading , technological progress and an important guarantee for the concentrated expression of the comprehensive national strength . Chinese manufacturing power shift from manufacturing country ,overhead bridge crane we first need the equipment manufacturing industry to take off .
In today's world power and both are power equipment manufacturing industry in the process of industrialization rely on the equipment manufacturing industry led. Japan had called the electromechanical industry leading sectors of economic take-off , as the improvement of national welfare "engine industry ." 20th century, the rise of information technology, nuclear technology, space technology , and both are created through equipment manufacturing industry .
Effectiveness of China's industrial structure adjustment, industrial level smooth upgrade, which depends largely on whether the equipment manufacturing sectors of the national economy to provide advanced , complete technical equipment .
In the 21st century, the industrial countries will put more priority to developing the equipment manufacturing industry strategic position . In recent years , the United States and other industrialized countries the proportion of manufacturing equipment manufacturing accounted for more than 40% , the emerging industrial countries more than 30% , and showed a rising trend .
"Eleventh Five-Year" period, China's equipment manufacturing industry is developing rapidly. Ministry of Industry and Information Technology data show that from 2006 to 2010 , average annual growth rate of industrial added value of China's equipment more than 25% . In 2010, the country's total industrial added value the industry accounted for more than 9% of GDP , accounting for 19.35% of all industry .
From the size of the current point of view, China's equipment manufacturing industry has leapt to the world. In radio communications , solar panels , coal and other industries, China has a number of enterprises have entered the world leader in the column. Some foreign media that the challenger from China is reshaping the global industry structure ,steel crane made in China are climbing up the value chain .
In the October 18, 2010 release of " The State Council on accelerating the development and development of strategic emerging industries decision" to determine the high-end equipment manufacturing industry as China's current focus on fostering and development of strategic emerging industries, will develop into 2020 pillar industries.
2013年8月25日星期日
Tower crane industry requires multilateral cooperation
Tower crane from the current industry size, growth rate, favorable policies such as the development trend, SMEs should actively develop product technology, optimizing product mix, cultivate brand value. In the information technology development today, the tower
overhead gantry crane business in ensuring the quality of products, you should seek a balance can promote the sales network of sales and output path.
Lifting equipment factory store that the tower crane industry needs multilateral cooperation, especially as such a professional factory store electronic business platform of cooperation. Small tower crane companies should enhance its strength in the ups and actively participate in trade shows and factory store activities and accurate understanding of their own position, competition in the market continue to explore the development of mechanisms to obtain deserved market share.
Has been completed. So both long-term planning is obviously difficult to meet the national highway traffic development needs. In order to better support the economic and social development,steel crane to adapt to a comprehensive well-off society and modernization requirements, the need for our trunk highway construction plan long-term development strategy, from the top on the design.
Thus, from a strategic point of view to the preparation and the top of the national road network planning is very necessary and very urgent. It reflects the development of the objective requirements of road traffic should be said that the preparation and introduction of the "planning", both to solve China's road traffic, in particular trunk highway transportation development process of the emergence of some practical problems, while also guiding the country road transport, especially long-term development trunk road transport has a strategic significance, so I thought, "planning" in the background and necessity is very important.
On the effective convergence problems that we have been committed for this "planning" process is a matter of concern, as it has always been an important issue throughout the planning process. Because road transport is the entire basis of an integrated transport system in the strongest modes of transport, providing a full range of door to door, the whole connection points, lines and transportation modes. In addition to basic addition, but it is also and railways and inland waterways and waterways of the main channel to work together to jointly form a main road, the main channel of the integrated transport function, so when in the preparation of this plan, put it in an integrated transport system backdrop to the requirements of building an integrated transport system to plan it, which is always our goal,hoist gantry crane grasp and focus.
Daidong Chang said, "planning" to build itself to develop effective integrated transport system is a major decision, mentioned the planning process, but in recent years we have noticed, the state has issued a coastal port planning, inland shipping and aviation and long-term planning planning. Long-term planning of the railway in recent years has made some adjustments. In this case, to adapt to the development of road transport, in particular with the construction of the modern transportation system to match only at the planning level for timely adjustment and improvement in order to better serve the construction of an integrated transport system.
In the "National Highway Network Plan" and a series of special programs under the guidance of highway, road traffic in the future be better able to play to their strengths, to better serve the overall transportation system construction and development.
Lifting equipment factory store that the tower crane industry needs multilateral cooperation, especially as such a professional factory store electronic business platform of cooperation. Small tower crane companies should enhance its strength in the ups and actively participate in trade shows and factory store activities and accurate understanding of their own position, competition in the market continue to explore the development of mechanisms to obtain deserved market share.
Has been completed. So both long-term planning is obviously difficult to meet the national highway traffic development needs. In order to better support the economic and social development,steel crane to adapt to a comprehensive well-off society and modernization requirements, the need for our trunk highway construction plan long-term development strategy, from the top on the design.
Thus, from a strategic point of view to the preparation and the top of the national road network planning is very necessary and very urgent. It reflects the development of the objective requirements of road traffic should be said that the preparation and introduction of the "planning", both to solve China's road traffic, in particular trunk highway transportation development process of the emergence of some practical problems, while also guiding the country road transport, especially long-term development trunk road transport has a strategic significance, so I thought, "planning" in the background and necessity is very important.
On the effective convergence problems that we have been committed for this "planning" process is a matter of concern, as it has always been an important issue throughout the planning process. Because road transport is the entire basis of an integrated transport system in the strongest modes of transport, providing a full range of door to door, the whole connection points, lines and transportation modes. In addition to basic addition, but it is also and railways and inland waterways and waterways of the main channel to work together to jointly form a main road, the main channel of the integrated transport function, so when in the preparation of this plan, put it in an integrated transport system backdrop to the requirements of building an integrated transport system to plan it, which is always our goal,hoist gantry crane grasp and focus.
Daidong Chang said, "planning" to build itself to develop effective integrated transport system is a major decision, mentioned the planning process, but in recent years we have noticed, the state has issued a coastal port planning, inland shipping and aviation and long-term planning planning. Long-term planning of the railway in recent years has made some adjustments. In this case, to adapt to the development of road transport, in particular with the construction of the modern transportation system to match only at the planning level for timely adjustment and improvement in order to better serve the construction of an integrated transport system.
In the "National Highway Network Plan" and a series of special programs under the guidance of highway, road traffic in the future be better able to play to their strengths, to better serve the overall transportation system construction and development.
Excavators, cranes, etc. in the first quarter sales fell 20%
Since the second half of 2012, subject to the impact of falling real estate investment growth, concrete machinery sales began to decline until 2013 a quarter has not improved. From sales data, excavators,
overhead bridge crane and other products in a quarter, about 20% in sales volume decline. Sluggish downstream demand, accounts receivable bad debt problems of the company tightened conditions of sale, profits are at a greater impact.
However, after entering the second quarter will accelerate investment in infrastructure,overhead gantry crane two quarters of recovery is expected to remain the industry. March 2013 to excavators, loaders, represented by sales of construction machinery product range has been narrowed down to about 5%. 2 quarter,steel crane with investment in infrastructure and the market is expected to accelerate the improvement of growth in sales of construction machinery is expected to remain.
However, after entering the second quarter will accelerate investment in infrastructure,overhead gantry crane two quarters of recovery is expected to remain the industry. March 2013 to excavators, loaders, represented by sales of construction machinery product range has been narrowed down to about 5%. 2 quarter,steel crane with investment in infrastructure and the market is expected to accelerate the improvement of growth in sales of construction machinery is expected to remain.
2013年8月22日星期四
Crane's position in the national economy analysis
Material Handling in the entire national economy has a very important position. Improve production efficiency
bridge gantry crane to ensure safe reliability, reduce material handling cost is important.
According to statistics, in the United States, per 100 yuan of industrial finished products, and material handling costs from $ 20-25 to account for the U.S. factory production process used in material handling work for 80% of total production cycle.
United Kingdom each year for plant and site material handling cost up to one billion pounds' bow when the right foot national wage expenditures ninth. In 1974, the British industrial material handling costs under the Ministry of the word good investigation committee to investigate the company for 30 and said: "inter-process material handling costs account for more than 12% processing fee, if coupled processes inside and outside the factory handling costs the cost is estimated to reach 20% -25%.
Germany Demag company had done a detailed investigation confirmed material handling costs account for 45% of the costs of production (30% of inter-process material handling, process material handling costs within 15%.)
Plant of Dongfeng Motor also some statistics, automotive parts in the plant's processing time only 5%,overhead gantry crane other 95% of man-hours were used in the handling and storage being. 1t products should produce material hoist 50t times, producing castings 1t to 80t handling times, the production capacity of Dongfeng Motor plant scheduled to 100,000, material handling equipment accounted for much of the total equipment.
Thus seen as an important component of material handling equipment steel crane s requirement is very impressive, lifting machinery industry has a broad prospect.
According to statistics, in the United States, per 100 yuan of industrial finished products, and material handling costs from $ 20-25 to account for the U.S. factory production process used in material handling work for 80% of total production cycle.
United Kingdom each year for plant and site material handling cost up to one billion pounds' bow when the right foot national wage expenditures ninth. In 1974, the British industrial material handling costs under the Ministry of the word good investigation committee to investigate the company for 30 and said: "inter-process material handling costs account for more than 12% processing fee, if coupled processes inside and outside the factory handling costs the cost is estimated to reach 20% -25%.
Germany Demag company had done a detailed investigation confirmed material handling costs account for 45% of the costs of production (30% of inter-process material handling, process material handling costs within 15%.)
Plant of Dongfeng Motor also some statistics, automotive parts in the plant's processing time only 5%,overhead gantry crane other 95% of man-hours were used in the handling and storage being. 1t products should produce material hoist 50t times, producing castings 1t to 80t handling times, the production capacity of Dongfeng Motor plant scheduled to 100,000, material handling equipment accounted for much of the total equipment.
Thus seen as an important component of material handling equipment steel crane s requirement is very impressive, lifting machinery industry has a broad prospect.
The direction of development of the domestic crane
(1) Improved lifting structure to reduce weight
Cranes and more domestic computer optimized design has been adopted, in order to improve the machine's technical performance and reduce weight, and in this context as far as possible the new structure. If 5 ~ 50t overhead bridge crane used in semi-generic off-track main beam structure, compared with the track box girder can be reduced or eliminated in the small girder stiffened plate, canceled short stiffened plate, reducing structural weight, saving processing time. Currently the national Spark Program proposed bridge using four split structure is not high, making it the same with the ordinary crane lifting height, the plant can be reduced corbel elevation 1.5m; two ends of the main beam is placed end of the beam, with high strength bolts connecting; wheel tread height drop as a result, will make the plant corbels elevation drop. In the role of the vertical wheel load, the calculation of the column height reduction, to reduce the capital cost plant, plant life increases.
(2) to large-scale development
Since the state tournament source two qe two wide attention and funding the construction of many large and medium hydropower turbines is growing. Especially in the construction of the Three Gorges project requirements for large overhead gantry crane rising rapidly. Three Gorges Project main plant installed two 1200/125t bridge crane, equipped with a large tower crane 2000t. Currently in the construction of large and medium-sized hydropower stations, there are many, such as Yantan, Longtan, GEHEYAN, Fujian outlet power stations; There are many nuclear power plants and large and medium-sized power plants need to build, it can be expected, large tonnage High Performance cranes requirement is very large and broad prospects.
(3) to fully absorb foreign advanced technology
Crane size car run institutions of the German demag company's "triple play" drives, hanging on the end of the beam inside, it is not under the main beam deflection and vibration, improved operational performance and life institutions, and to structure Compact, beautiful appearance, easy installation and maintenance. With the domestic machining capabilities, so that carts end beam and small frame overall boring as possible, and thus split and wheels 45 degrees or cylindrical bearing housing will likely replace the angular bearing box, mounted on axle hole on the axle centerline and end beam centerline constitute the standard 90 degrees, so the horizontal and vertical deflection of the wheels can be strictly controlled within prescribed limits, to avoid the phenomenon of eating track. Due to the small frame is a bore formed after welding, hole center line of the four wheels in the same plane, the three-point landing successfully solved the problem.
Hoisting mechanism in the hardened or hardened reducer, gear accuracy of 7, the tooth surface hardness 320HBS, thus increasing the carrying capacity, extended service life. Electrical control absorbing foreign advanced technology, using a novel energy-saving speed control system. If thyristor cascade open or closed loop systems, scaling up to 1:30. With the increasing demand for speed, frequency control system will also allow for the steel crane. Meanwhile, computer-controlled crane will also be applied, such as the Three Gorges dam project 600t gantry cranes require frequency control system, microcomputer automatic correction and Big Head precision microcomputer monitoring system. With the development of production requirements for remote crane is also growing, Baoshan steel mill cranes in the study abroad after the proposed remote crane develop recommendations to improve safety, reduce labor.
Cranes and more domestic computer optimized design has been adopted, in order to improve the machine's technical performance and reduce weight, and in this context as far as possible the new structure. If 5 ~ 50t overhead bridge crane used in semi-generic off-track main beam structure, compared with the track box girder can be reduced or eliminated in the small girder stiffened plate, canceled short stiffened plate, reducing structural weight, saving processing time. Currently the national Spark Program proposed bridge using four split structure is not high, making it the same with the ordinary crane lifting height, the plant can be reduced corbel elevation 1.5m; two ends of the main beam is placed end of the beam, with high strength bolts connecting; wheel tread height drop as a result, will make the plant corbels elevation drop. In the role of the vertical wheel load, the calculation of the column height reduction, to reduce the capital cost plant, plant life increases.
(2) to large-scale development
Since the state tournament source two qe two wide attention and funding the construction of many large and medium hydropower turbines is growing. Especially in the construction of the Three Gorges project requirements for large overhead gantry crane rising rapidly. Three Gorges Project main plant installed two 1200/125t bridge crane, equipped with a large tower crane 2000t. Currently in the construction of large and medium-sized hydropower stations, there are many, such as Yantan, Longtan, GEHEYAN, Fujian outlet power stations; There are many nuclear power plants and large and medium-sized power plants need to build, it can be expected, large tonnage High Performance cranes requirement is very large and broad prospects.
(3) to fully absorb foreign advanced technology
Crane size car run institutions of the German demag company's "triple play" drives, hanging on the end of the beam inside, it is not under the main beam deflection and vibration, improved operational performance and life institutions, and to structure Compact, beautiful appearance, easy installation and maintenance. With the domestic machining capabilities, so that carts end beam and small frame overall boring as possible, and thus split and wheels 45 degrees or cylindrical bearing housing will likely replace the angular bearing box, mounted on axle hole on the axle centerline and end beam centerline constitute the standard 90 degrees, so the horizontal and vertical deflection of the wheels can be strictly controlled within prescribed limits, to avoid the phenomenon of eating track. Due to the small frame is a bore formed after welding, hole center line of the four wheels in the same plane, the three-point landing successfully solved the problem.
Hoisting mechanism in the hardened or hardened reducer, gear accuracy of 7, the tooth surface hardness 320HBS, thus increasing the carrying capacity, extended service life. Electrical control absorbing foreign advanced technology, using a novel energy-saving speed control system. If thyristor cascade open or closed loop systems, scaling up to 1:30. With the increasing demand for speed, frequency control system will also allow for the steel crane. Meanwhile, computer-controlled crane will also be applied, such as the Three Gorges dam project 600t gantry cranes require frequency control system, microcomputer automatic correction and Big Head precision microcomputer monitoring system. With the development of production requirements for remote crane is also growing, Baoshan steel mill cranes in the study abroad after the proposed remote crane develop recommendations to improve safety, reduce labor.
"Made in China" crane there are some gaps in the overall rise
Our crane manufacturing industry from scratch, gradually developed, the "Eleventh Five-Year" period of domestic
bridge gantry crane manufacturing industry has made considerable progress, some large and medium-sized backbone enterprises of some products have reached the international advanced level and even lead, but overall still with foreign advanced level there are still some gaps.
Compared with the international advanced level, the domestic enterprises in the large equipment product development and system integration capabilities, general equipment of different specifications and performance of products, parts, components, and the reliability of the product appearance and coating, people Machine relations and other aspects of environmental factors, there are still some gaps.
At present, China's crane products with foreign advanced level gap is mainly reflected in the industrial scale, the core technology, management, talent pool and so on.
In the industrial scale, the comparison with the large foreign enterprises and domestic enterprises in the overhead gantry crane scale is still a large gap between the small-scale, the formation of the international context of enterprise technology innovation and marketing and service network construction, generating constraints. However, in recent years, Chinese crane industry to achieve a "blowout" development, the crane industry scale and enterprise scale, closer to the requirements of international operations.
In the core technology, our crane technology is relatively backward, equipment performance can not meet the processing requirements, means of control failure, quality assurance system can not function effectively, outstanding performance in part flatness, roughness, and the vertical axis to reach the design requirements , but the quality of domestic fittings hard.
A hydraulic products, for example. Although our hydraulic industry has made great progress, but with the world advanced level, there are still large gaps, mainly reflected in product variety, performance, and reliability. Only foreign varieties of hydraulic products for 1/3, life abroad 1/2. To meet the key host, hosts, and imports of major technical equipment needs, every year a large number of hydraulic products imports.
Especially in the management of international management experience deficiencies, has become China's crane business internationalization process more difficult to break one aspect. From the company's management philosophy to the corporate culture, from basic management systems into thinking ability, etc., each have a non-overnight transformation can be realized.
Heavy machinery manufacturing industry as a high-tech talent competition is the crane industry toward nationalization of important support, and the current lack of talent pool has become our crane industry to better participate in international market competition, an important obstacle, therefore, the relevant enterprises should strengthen the training and introduction to understand the needs of the international market background and talents, to create an excellent, with international operational capacity of the personnel to the international development of enterprises laid a good foundation.
Crane Industry Outlook Industry Research Institute researcher Zhang Lan chant that the future will focus on the global overhead bridge crane industry products large-scale, high-speed, durability and specialization of direction, the series modular, combination, standardization and practical orientation and general product miniaturization, lighter, simple and diversification direction, end, China crane enterprises should increase investment in research, personnel training and introduction, and effectively enhance the core competitiveness of the industry, and actively participate in international market competition.
Compared with the international advanced level, the domestic enterprises in the large equipment product development and system integration capabilities, general equipment of different specifications and performance of products, parts, components, and the reliability of the product appearance and coating, people Machine relations and other aspects of environmental factors, there are still some gaps.
At present, China's crane products with foreign advanced level gap is mainly reflected in the industrial scale, the core technology, management, talent pool and so on.
In the industrial scale, the comparison with the large foreign enterprises and domestic enterprises in the overhead gantry crane scale is still a large gap between the small-scale, the formation of the international context of enterprise technology innovation and marketing and service network construction, generating constraints. However, in recent years, Chinese crane industry to achieve a "blowout" development, the crane industry scale and enterprise scale, closer to the requirements of international operations.
In the core technology, our crane technology is relatively backward, equipment performance can not meet the processing requirements, means of control failure, quality assurance system can not function effectively, outstanding performance in part flatness, roughness, and the vertical axis to reach the design requirements , but the quality of domestic fittings hard.
A hydraulic products, for example. Although our hydraulic industry has made great progress, but with the world advanced level, there are still large gaps, mainly reflected in product variety, performance, and reliability. Only foreign varieties of hydraulic products for 1/3, life abroad 1/2. To meet the key host, hosts, and imports of major technical equipment needs, every year a large number of hydraulic products imports.
Especially in the management of international management experience deficiencies, has become China's crane business internationalization process more difficult to break one aspect. From the company's management philosophy to the corporate culture, from basic management systems into thinking ability, etc., each have a non-overnight transformation can be realized.
Heavy machinery manufacturing industry as a high-tech talent competition is the crane industry toward nationalization of important support, and the current lack of talent pool has become our crane industry to better participate in international market competition, an important obstacle, therefore, the relevant enterprises should strengthen the training and introduction to understand the needs of the international market background and talents, to create an excellent, with international operational capacity of the personnel to the international development of enterprises laid a good foundation.
Crane Industry Outlook Industry Research Institute researcher Zhang Lan chant that the future will focus on the global overhead bridge crane industry products large-scale, high-speed, durability and specialization of direction, the series modular, combination, standardization and practical orientation and general product miniaturization, lighter, simple and diversification direction, end, China crane enterprises should increase investment in research, personnel training and introduction, and effectively enhance the core competitiveness of the industry, and actively participate in international market competition.
Large cranes "encounter" increased market opportunities in Europe
As we all know, whether in production or longer in use, China has been the largest market for cranes in exports also has an irreplaceable position. Although in recent years has been the impact of the economic situation at home and abroad, the export volume has been reduced, but the 2012 is approaching, the rumors say, but will usher in the export opportunities, especially in the European market. Although at this stage the number of small cranes on the European market has been spilled, but for large
steel crane , the market's "encounter" opportunities will be more and more.
One opportunity: 2012 UEFA European Football Championship
Now Poland, is busy preparing for the European Football Federation 2012 European Football Championship, as the host of this event, one of Poland required substantial investment. For example, the capital of Poland for Euro 2012, one of key construction projects in the National Stadium in Warsaw. Meanwhile, in the transport infrastructure still needs a lot of investment, only large-scale investment projects that are expected to more than 1 billion euros on, this is the country's current national construction cost of nearly 30%. Here's residential and infrastructure construction market another boom, housing and infrastructure, there has been large-scale projects. In infrastructure, the crane is absolutely essential for the mechanical one, so this overhead gantry crane for Chinese manufacturers, as long as they achieve cooperation, this is definitely a huge market share.
The two opportunities: Wind energy construction
European crane market prosperity will be another place Scania areas, where large crane equipment has been in short supply state. More than 6.6 trillion euros of the capital cost of wind power in Finland, Norway and Sweden has brought more than 10 billion euros of credit, so that here the crane company to meet the needs of exhausted, but still can not meet the market demand, and in Norway, people used to in large-scale projects will be outsourced to foreign companies. China Machinery Network pointed out that, in recent years, these areas at the land wind power generation will still have significant investments, if China crane companies to win a share in this market, it will be driven by the overall Chinese hoist gantry crane industry.
Industry analysts said: "In the recent downturn in the world economy of the state, although most markets are depressed, but local circumstances. 'East does not shine bright', which is inevitable, if a local situation is bad they do not represent the whole of this, just as some European market good question, and there are emerging markets like these will see you how to find opportunity, how to mobilize the production and export of. "
One opportunity: 2012 UEFA European Football Championship
Now Poland, is busy preparing for the European Football Federation 2012 European Football Championship, as the host of this event, one of Poland required substantial investment. For example, the capital of Poland for Euro 2012, one of key construction projects in the National Stadium in Warsaw. Meanwhile, in the transport infrastructure still needs a lot of investment, only large-scale investment projects that are expected to more than 1 billion euros on, this is the country's current national construction cost of nearly 30%. Here's residential and infrastructure construction market another boom, housing and infrastructure, there has been large-scale projects. In infrastructure, the crane is absolutely essential for the mechanical one, so this overhead gantry crane for Chinese manufacturers, as long as they achieve cooperation, this is definitely a huge market share.
The two opportunities: Wind energy construction
European crane market prosperity will be another place Scania areas, where large crane equipment has been in short supply state. More than 6.6 trillion euros of the capital cost of wind power in Finland, Norway and Sweden has brought more than 10 billion euros of credit, so that here the crane company to meet the needs of exhausted, but still can not meet the market demand, and in Norway, people used to in large-scale projects will be outsourced to foreign companies. China Machinery Network pointed out that, in recent years, these areas at the land wind power generation will still have significant investments, if China crane companies to win a share in this market, it will be driven by the overall Chinese hoist gantry crane industry.
Industry analysts said: "In the recent downturn in the world economy of the state, although most markets are depressed, but local circumstances. 'East does not shine bright', which is inevitable, if a local situation is bad they do not represent the whole of this, just as some European market good question, and there are emerging markets like these will see you how to find opportunity, how to mobilize the production and export of. "
Gantry crane maintenance content
1 gantry crane luffing gear rack drives the various security settings should be sensitive and reliable. Because the rack easier to wear in the job, resulting in shock when starting and braking, such as security settings are not reliable, the boom will occur over travel and the risk of falling.
2 bridge gantry crane hydraulic luffing drive device is a compact, able to withstand two-way force, etc., but its piston, cylinder, push rod has a certain precision, to strengthen maintenance.
3 attachment bolts torque wrench to be used, so that the preload is relatively uniform. Since gantry crane operation prone to vibration, to regularly check the bolts are loose.
4 using the hydraulically actuated brake should always check the hydraulic oil quantity is insufficient to amount to add. To check whether the pipe joints with hydraulic oil or air leakage into the interior of the tank, such as air tanks should be promptly removed.
5 Run agencies and brakes should always check, especially if you want to check the steel crane brake solenoid is stuck due to vibration does not move, but also check whether the solenoid coil damp.
6 the hydraulic pump oil varieties, the temperature should be selected depending on the region. To prevent the pump draws air in the work process, we should always check the discharge.
7 As gantry cranes self-important,overhead gantry crane therefore trolley bearings should be balanced calcium-based grease once a week to ensure that the friction surface will not appear dry friction phenomenon.
2 bridge gantry crane hydraulic luffing drive device is a compact, able to withstand two-way force, etc., but its piston, cylinder, push rod has a certain precision, to strengthen maintenance.
3 attachment bolts torque wrench to be used, so that the preload is relatively uniform. Since gantry crane operation prone to vibration, to regularly check the bolts are loose.
4 using the hydraulically actuated brake should always check the hydraulic oil quantity is insufficient to amount to add. To check whether the pipe joints with hydraulic oil or air leakage into the interior of the tank, such as air tanks should be promptly removed.
5 Run agencies and brakes should always check, especially if you want to check the steel crane brake solenoid is stuck due to vibration does not move, but also check whether the solenoid coil damp.
6 the hydraulic pump oil varieties, the temperature should be selected depending on the region. To prevent the pump draws air in the work process, we should always check the discharge.
7 As gantry cranes self-important,overhead gantry crane therefore trolley bearings should be balanced calcium-based grease once a week to ensure that the friction surface will not appear dry friction phenomenon.
2013年8月21日星期三
Bridge crane inspection and maintenance system - inspection and lubrication
3 half Inspection and Maintenance
Maintenance and inspection once every six months, including the month in addition to checking the content outside there should be:
1) Check that all the gear reducer and wear,overhead bridge crane pitting damage to the tooth surface should not exceed 30% of the engagement surface and a depth of not more than 10% of the original thickness of the teeth (tooth thickness fixed chord); wear of the tooth thickness the percentage of the original tooth thickness does not exceed 15% to 25%; Check bearing condition; replace oil.
2) check whether large, small wheel condition, the wheel bearings lubricated track to eliminate the phenomenon of eating.
3) Check the main girder, end beam welds have to open the main welding, corrosion phenomena, rust should not exceed 10% of the original thickness of the principal stress components whether fatigue cracks; various rails, brackets are intact; inspection girder, end beam and tighten the bolt again.
4) Check the main beam deformation. Check the trolley track situation. Main beam interference under no load should not exceed the span 1/2000; girders bent inwards next level measured length shall not exceed 1/1500; trolley rail track should not produce the phenomenon,sino hoist rail top face and flank wear ( sided) volume must not exceed 3mm.
5) Check the reel case, reel wall wear should not exceed 20% of the original wall, rope groove hump does not strain the tip.
6) Tighten all bolts on the crane and fastening bolts.
4 crane lubrication
Lubrication is to ensure the normal operation of the machine, to extend the life of parts, improve efficiency and safety of the important measures. Maintenance personnel should fully understand the importance of lubrication equipment, always check the lubrication of all moving points, and regularly add oil to each lubrication points (grease).
4.1 Dan river bridge machine main power plant lubrication
① bridge machine winch; ② kinds of bearings; ③ each gear couplings; ④ reducer; ⑤ rope; ⑥ hinge point on the brake.
4.2 Lubrication Precautions
1) maintain the lubricant (grease) clean;
2) different grades of lubricating oil (fat) should not be mixed;
3) selection of a suitable lubricant (grease) at the stipulated time for lubrication;
4) using pressure greasing France (grease gun or pump, screw-type oil cup) add grease, so you can put grease pushed the friction surface to prevent his hand when not enter the friction surface;
5) wet areas should not use sodium based grease, because of its hydrophilic, easy to lapse;
6) The agency did not oiling point rotating parts, should be regularly rotated with dilute oiler in the gap,overhead gantry crane in order to reduce mechanical friction and prevent corrosion.
Bridge crane inspection and maintenance system - weekly inspection and monthly inspection
bridge gantry crane components as more different techniques for the various components of the features, we will be maintained in the actual work, inspection cycle is divided into weeks, months, years, each cycle including the following:
1 weekly inspection and maintenance
Maintenance and inspection once a week, inspection and maintenance as follows:
1) Check the brakes on the nuts, cotter pins, positioning plates are complete, loose, levers and springs without cracks, pin on the brake wheel bolts and washers are loose cushion, complete; brakes are reliable braking. Brake release opening of the brake pads should be less than 1.0mm, and the distance of the gap on both sides of the brake drum should be equal, the pivot pin may have stuck.
2) Check the safety switch and limit switch is accurate, flexible and reliable work, especially the increase in the limit is reliable.
3) Check the wire rope on the drum and pulley wound is normal, without off-tank, channeling, knotted, twisted and other phenomena, wire rope clamp bolts are tightened, whether there is double nut locking devices.
4) Check the hoisting mechanism coupling closures fastening screw is loose, the shortage.
5) Check the transmission mechanism is normal,overhead bridge crane with or without abnormal noise.
6) Check all lubrication lubrication condition is good.
7) Check the track if there is a foreign body obstruction bridge machine is running.
(2) Monthly inspection and maintenance
Once monthly maintenance and inspection, inspection and maintenance, we cover every week to the contents include:
1) Check the brake pad wear pads should not exceed 2mm, wheel and brake pad contact area shall not be less than 70%; checks the status of each mounting pin and wear and lubrication conditions, the amount of wear of the pin should not exceed 5% of the original diameter of the small axis and the amount of wear of the mandrel should not exceed 5% of the original diameter and ovality than 0.5mm.
2) Check the wire rope for wear, if there is broken wire and so on, check the wire rope lubrication conditions.
3) Check the hook for cracks, wear and tear of its dangerous section does not exceed 5% of the original thickness; hook nut locking device is complete, set the hook on the various parts are complete and reliable. Hook should rotate flexible, non-jamming phenomenon.
4) Check that all bolts are loose and shortages.
5) Check the motor, reducer bolts fastening the base and individually fastened.
6) Check the gearbox lubrication conditions, the oil level should be within the specified range, measures should be taken against oil leakage sites prevent leakage.
7) of the gears.
8) Check the balance at the rope pulleys for wear on pulleys and pulley shaft lubrication.
9) Check the pulley position, to see whether it flexible, without damage, cracks, particular attention to the wear of the fixed pulley shaft.
10) Check the brake wheel, uneven surface of its work should not exceed 1.5mm, brake wheel should not have cracks, its radial runout should be less than 0.3mm.
11) Check the coupling, which should not be on the key and keyway damage, loose; two coupling between the drive shaft axial string momentum should be 2 ~ 7mm.
12) Check the size of the vehicle operating conditions, should not have gnawing rails, three fulcrum, when the pendulum starts and stops and so on. Check the wheel rim and the tread wear, the wear of the rim thickness should not exceed 50% of the original thickness, wheel tread wear should not exceed 3% of the diameter of the wheel of the original.
13) Check the cart track conditions,overhead gantry crane to see whether the bolts loose, shortages, pressure plate is fixed on the track, rail cracks and fracture; two tracks whether the gap joints 1 ~ 2mm (summer) or 3 ~ 5mm ( winter), the joint down, left dislocation is more than 1mm.
14) for the crane to conduct a comprehensive clean, clear on dirt.
2013年8月20日星期二
Mobile crane are several?
Mobile crane is rotating jib crane. Since the power system on its own drive, also known as self-propelled cranes, which used to be called pneumatic tire assembly wheeled cranes. Mobile
overhead gantry crane can travel long distances and flexible conversion job site, mobility, and therefore widely used.
There are mobile crane truck crane, tire cranes and crawler cranes, their characteristics are briefly described below.
1. Used truck crane chassis, with a car driving through the performance, speed is high. Disadvantage is running can not load, lifting legs must fight. But because of its flexible, fast transfer characteristics, making the use of mobile cranes largest amount cranes.
2. Crane uses a specially designed tire tire chassis, wide track, good stability, can work around all sides, on flat ground without legs can load driving. In other countries, especially off-road tire tire hoist gantry crane more widely used, much to replace cranes trend.
3. Crawler crane with crawler chassis, walking by the crawler crane. Compared with the wheeled crane has its outstanding features: Crawler large contact area with the ground than live small, in the soft, muddy ground operations; traction coefficient is high, climbing degree, you can travel on bumpy field; crawler bearing wide, good stability, generally do not need to set outrigger devices. Weakness is cumbersome,bridge gantry crane slow driving on pavement damage effects, higher manufacturing costs.
There are mobile crane truck crane, tire cranes and crawler cranes, their characteristics are briefly described below.
1. Used truck crane chassis, with a car driving through the performance, speed is high. Disadvantage is running can not load, lifting legs must fight. But because of its flexible, fast transfer characteristics, making the use of mobile cranes largest amount cranes.
2. Crane uses a specially designed tire tire chassis, wide track, good stability, can work around all sides, on flat ground without legs can load driving. In other countries, especially off-road tire tire hoist gantry crane more widely used, much to replace cranes trend.
3. Crawler crane with crawler chassis, walking by the crawler crane. Compared with the wheeled crane has its outstanding features: Crawler large contact area with the ground than live small, in the soft, muddy ground operations; traction coefficient is high, climbing degree, you can travel on bumpy field; crawler bearing wide, good stability, generally do not need to set outrigger devices. Weakness is cumbersome,bridge gantry crane slow driving on pavement damage effects, higher manufacturing costs.
Several crane introduce rehabilitation programs
General
overhead gantry crane for its large carrying capacity, good stability and a series of advantages are widely used in various types of workshops, factories and warehouses. However, the lack of impact of headspace height of overhead cranes, double girder bridge crane particularly important reason to use one. The workshop or factory roof reconstruction is very difficult work; re-build the crane bearing rail beam is put too much, so by the traditional general-purpose
overhead bridge crane structural transformation, reduce machine height, is the most viable solution to this problem methods.
Crane design principles explicitly mentioned in the three basic conditions:
Cranes and mechanical parts metal structure should have sufficient strength, stiffness and resistance to buckling;
Machine must have the necessary stability against overturning;
Prime mover has to meet the requirements of the job performance power brakes provide the necessary braking torque.hoist gantry crane During crane structural transformation, they must meet three basic conditions. Traditional designs were analyzed and found the car above the rail height is the height of the main factors affecting the whole world.
Through its orbit for small frame transformation can reduce machine height. Small frame metal structure change this transformation program will be the biggest feature is the horizontal support surface placed in the car, under the car axle instead of the traditional design will be placed on the supporting surface on top of the car axle. Rack mounted in the car lifting mechanism and other components "hidden" in between the two main beams and shelves trolley car parts below the highest point of the axle.
General overhead crane technology is mature, highlight the advantages. But according to the traditional design of a large crane machine height, in some special occasions can not install and use. Through the transformation of the trolley bridge crane structure can reduce the overall height of the overhead crane applications enhance the breadth. Above describes several rehabilitation programs, and in the actual production in the applications.
Crane design principles explicitly mentioned in the three basic conditions:
Cranes and mechanical parts metal structure should have sufficient strength, stiffness and resistance to buckling;
Machine must have the necessary stability against overturning;
Prime mover has to meet the requirements of the job performance power brakes provide the necessary braking torque.hoist gantry crane During crane structural transformation, they must meet three basic conditions. Traditional designs were analyzed and found the car above the rail height is the height of the main factors affecting the whole world.
Through its orbit for small frame transformation can reduce machine height. Small frame metal structure change this transformation program will be the biggest feature is the horizontal support surface placed in the car, under the car axle instead of the traditional design will be placed on the supporting surface on top of the car axle. Rack mounted in the car lifting mechanism and other components "hidden" in between the two main beams and shelves trolley car parts below the highest point of the axle.
General overhead crane technology is mature, highlight the advantages. But according to the traditional design of a large crane machine height, in some special occasions can not install and use. Through the transformation of the trolley bridge crane structure can reduce the overall height of the overhead crane applications enhance the breadth. Above describes several rehabilitation programs, and in the actual production in the applications.
2013年8月19日星期一
Threaded connection bridge crane demolition methods and precautions
Removing the threaded connection. Threaded connection in the mechanical connection is the most widely, it has a simple, easy to adjust and multiple disassembly and assembly advantages.steel crane Its removal easier, but also often due to inadequate attention, improper selection tools, demolition method is not correct and cause damage. Bridge crane screwed General demolition method is:
First, recognize the thread rotation, use the right tools (wrench, screwdriver sizes match), forced to be uniform. Remove threaded connections generally should not use an extension, only by the force of the special threaded parts, the use of specialized forging wrench, allows the use of extensions. To reduce labor intensity and improve work efficiency, should be adopted motorized wrench. Use special wrench to remove the stud.overhead bridge crane Special circumstances Removing the threaded connections:
1 decapitated screw off the surface and below the body disassembly:
a. the screw drilled into polygonal hardened steel, then screw extruder;
b. decapitated end of the center in drilling, tapping reverse threaded screw screwed into reverse spin out;
c. the screw holes (diameter equivalent to minor diameter), with the same specifications tap tapping; drilling large diameter threaded equivalent, attack large a diameter thread.
2 decapitated screws exposed on the outer surface of the body part of the demolition:
a. at the head sawed off groove with a screwdriver screwed out;overhead gantry crane migraine processed in off the head or square head with a wrench;
b. increase in off the head or nut welded curved rod out;
c. screws thick, use a flat shovel circumferentially excised.
First, recognize the thread rotation, use the right tools (wrench, screwdriver sizes match), forced to be uniform. Remove threaded connections generally should not use an extension, only by the force of the special threaded parts, the use of specialized forging wrench, allows the use of extensions. To reduce labor intensity and improve work efficiency, should be adopted motorized wrench. Use special wrench to remove the stud.overhead bridge crane Special circumstances Removing the threaded connections:
1 decapitated screw off the surface and below the body disassembly:
a. the screw drilled into polygonal hardened steel, then screw extruder;
b. decapitated end of the center in drilling, tapping reverse threaded screw screwed into reverse spin out;
c. the screw holes (diameter equivalent to minor diameter), with the same specifications tap tapping; drilling large diameter threaded equivalent, attack large a diameter thread.
2 decapitated screws exposed on the outer surface of the body part of the demolition:
a. at the head sawed off groove with a screwdriver screwed out;overhead gantry crane migraine processed in off the head or square head with a wrench;
b. increase in off the head or nut welded curved rod out;
c. screws thick, use a flat shovel circumferentially excised.
Lifting tire maintenance process should pay attention to use what issues
Lifting tires for your analysis process should be maintained in the use of primary attention to the following three points:
1 Pressure Normal
The tire pressure must be maintained properly. Pressure is normal, tread contact area with the road,sino hoist bear the load evenly, normal wear and tear, if the pressure was too low, the tire stiffness degradation, bearing deformation after serious because the tire shoulder wear increased local ground deformation will be serious carcass caused fever, fatigue caused by cords, and other early loss carcass stratification; if pressure is too high, will tire stiff, elasticity, cords and broken due to excessive stretching, and because of the ground area smaller, accelerated tire crown local wear and increasing the load per unit area, causing early damage or puncture,overhead bridge crane this phenomenon is particularly serious in summer. Therefore, the driver should pay attention to before work check the tire pressure, insufficient to timely inflated.
2 smooth start-up and shutdown
Machinery at the very start, tire rotation by a sudden standstill, if starting excessive speed, tire and road generates intense friction, can accelerate tread wear. Therefore, construction machinery started, not too much should tie loose clutch and accelerate properly,overhead gantry crane so that the machinery started slowly and smoothly without shaking to avoid dragging the tire and the ground accelerated tread wear.
3 Maintenance timely
Machinery in motion, if there is weakness, operational difficulties, body tilt, abnormal noise, jitter or a burning smell, immediately stop and check tire condition. Way to rest, you should check the tire pressure and temperature is normal, the wheel nut is loose, the tire is being scratched and so on, and carefully check whether the debris embedded in the tread, if it is found to be promptly removed.
1 Pressure Normal
The tire pressure must be maintained properly. Pressure is normal, tread contact area with the road,sino hoist bear the load evenly, normal wear and tear, if the pressure was too low, the tire stiffness degradation, bearing deformation after serious because the tire shoulder wear increased local ground deformation will be serious carcass caused fever, fatigue caused by cords, and other early loss carcass stratification; if pressure is too high, will tire stiff, elasticity, cords and broken due to excessive stretching, and because of the ground area smaller, accelerated tire crown local wear and increasing the load per unit area, causing early damage or puncture,overhead bridge crane this phenomenon is particularly serious in summer. Therefore, the driver should pay attention to before work check the tire pressure, insufficient to timely inflated.
2 smooth start-up and shutdown
Machinery at the very start, tire rotation by a sudden standstill, if starting excessive speed, tire and road generates intense friction, can accelerate tread wear. Therefore, construction machinery started, not too much should tie loose clutch and accelerate properly,overhead gantry crane so that the machinery started slowly and smoothly without shaking to avoid dragging the tire and the ground accelerated tread wear.
3 Maintenance timely
Machinery in motion, if there is weakness, operational difficulties, body tilt, abnormal noise, jitter or a burning smell, immediately stop and check tire condition. Way to rest, you should check the tire pressure and temperature is normal, the wheel nut is loose, the tire is being scratched and so on, and carefully check whether the debris embedded in the tread, if it is found to be promptly removed.
Bridge crane bridge strengthening scheme
As steel production needs,
bridge gantry crane frequent long at full load lifting of the state of the bridge crane will appear under torsion, lateral bending and other serious problems, greatly shorten the life of the bridge, but not conducive to the safe operation of the crane . Therefore, to be reinforced for overhead crane bridge, in order to improve the carrying capacity of the bridge and the safety factor, Here I share with bridge strengthening scheme:
Need for the reinforcement of the overhead bridge crane girder bridge box-shaped track, a span of 16.5m. Improve the overall carrying capacity of the bridge primarily for the main beam, main beam and side beams connecting welds, end beam three parts to reinforce dangerous section of the program is as follows.
1.1 improve the carrying capacity of the main beam reinforcement scheme
Increasing the cross sectional area of the main beam can increase the moment of inertia, thereby increasing the strength and rigidity of the main beam, the main beam is to improve the carrying capacity of a reliable and effective way. Increasing the cross sectional area of the main beam of the most common methods are the following three kinds, each of the following features:
(A) small box beam welding reinforcement increases large cross-sections to increase the quality of large structural components, structural parts production workload, difficult construction, welding capacity, suitable for large tonnage, larger span Crane beam reinforcement.
(2) increased reinforcement welded channel cross-sectional area smaller than the welded box girder reinforcement method is small, welding capacity, but the increase of the structural parts quality to light, the structure of the production of a small amount of work, construction difficulty, suitable for representing large tonnage, smaller crane girder span reinforcement.
(3) the increase in cross-sectional area Prestressed Reinforcement and welding small box girder reinforcement method considerably, welding a small amount of light to increase the quality of structural components, structural parts produced small amount of work, construction difficulty, suitable for small tonnage overhead gantry crane main beam reinforcement. Taken together, decided to adopt the main beam under the cover plate is welded on the 16th channel reinforcement, and in the cover plate weld a new cover.
1.2 improve the main beam and side beams carrying capacity of the connection weld reinforcement program
Main beam and the end plate connections through the beam web, and the web plate carrying the most shear weld, the weld connecting the bearing capacity of the attachment welds number, length, thickness of the meat is directly related to welding, which increase the connection increase the number of weld seam on the carrying capacity of the most significant effect. Therefore, using a solution to increase the number of attachment welds, which in the original plate and welding the outside of a reinforcement plate.
1.3 improve the carrying capacity of the end beam reinforcement program
Reinforcement required at each end of the beam bridge crane under two wheels, track smaller, and thus end beam to withstand the bending moment is small, so the upper and lower lid force is small, can not reinforced; side beam web is subjected to a more large shear, while at the wheel support section to withstand the most vigorous, therefore, to take the end of the beam web welded steel shearing reinforcement program.
Need for the reinforcement of the overhead bridge crane girder bridge box-shaped track, a span of 16.5m. Improve the overall carrying capacity of the bridge primarily for the main beam, main beam and side beams connecting welds, end beam three parts to reinforce dangerous section of the program is as follows.
1.1 improve the carrying capacity of the main beam reinforcement scheme
Increasing the cross sectional area of the main beam can increase the moment of inertia, thereby increasing the strength and rigidity of the main beam, the main beam is to improve the carrying capacity of a reliable and effective way. Increasing the cross sectional area of the main beam of the most common methods are the following three kinds, each of the following features:
(A) small box beam welding reinforcement increases large cross-sections to increase the quality of large structural components, structural parts production workload, difficult construction, welding capacity, suitable for large tonnage, larger span Crane beam reinforcement.
(2) increased reinforcement welded channel cross-sectional area smaller than the welded box girder reinforcement method is small, welding capacity, but the increase of the structural parts quality to light, the structure of the production of a small amount of work, construction difficulty, suitable for representing large tonnage, smaller crane girder span reinforcement.
(3) the increase in cross-sectional area Prestressed Reinforcement and welding small box girder reinforcement method considerably, welding a small amount of light to increase the quality of structural components, structural parts produced small amount of work, construction difficulty, suitable for small tonnage overhead gantry crane main beam reinforcement. Taken together, decided to adopt the main beam under the cover plate is welded on the 16th channel reinforcement, and in the cover plate weld a new cover.
1.2 improve the main beam and side beams carrying capacity of the connection weld reinforcement program
Main beam and the end plate connections through the beam web, and the web plate carrying the most shear weld, the weld connecting the bearing capacity of the attachment welds number, length, thickness of the meat is directly related to welding, which increase the connection increase the number of weld seam on the carrying capacity of the most significant effect. Therefore, using a solution to increase the number of attachment welds, which in the original plate and welding the outside of a reinforcement plate.
1.3 improve the carrying capacity of the end beam reinforcement program
Reinforcement required at each end of the beam bridge crane under two wheels, track smaller, and thus end beam to withstand the bending moment is small, so the upper and lower lid force is small, can not reinforced; side beam web is subjected to a more large shear, while at the wheel support section to withstand the most vigorous, therefore, to take the end of the beam web welded steel shearing reinforcement program.
2013年8月16日星期五
Analysis of bridge crane troubleshooting methods
1 When the crane mechanical failure:
If a fault occurs in the body or trolley carts run institutions, should emergency power;
If a fault occurs in the lifting sector, the driver should immediately send an emergency signal:overhead gantry crane Ming alarm, loud warning notice below the staff with the control measures taken to avoid and to immediately start again on the hook lifting mechanism is controlled so that the hook can not produce free fall state;
2 crane failure there is an electrical failure or malfunction illusion:
Turn off the start switch and the driver with emergency switch down the way;
Ground staff with total three-phase bridge gantry crane off the power switch way, cutting off power to effectively control overhead crane failure events to expand, and then stop and check repairs;
For overhead bridge crane illusion failure of the control, less experienced drivers, the operating handle is not exactly stay in the controller's zero due to zero as long as the operating handle complex, failure phenomenon can be avoided.
If a fault occurs in the body or trolley carts run institutions, should emergency power;
If a fault occurs in the lifting sector, the driver should immediately send an emergency signal:overhead gantry crane Ming alarm, loud warning notice below the staff with the control measures taken to avoid and to immediately start again on the hook lifting mechanism is controlled so that the hook can not produce free fall state;
2 crane failure there is an electrical failure or malfunction illusion:
Turn off the start switch and the driver with emergency switch down the way;
Ground staff with total three-phase bridge gantry crane off the power switch way, cutting off power to effectively control overhead crane failure events to expand, and then stop and check repairs;
For overhead bridge crane illusion failure of the control, less experienced drivers, the operating handle is not exactly stay in the controller's zero due to zero as long as the operating handle complex, failure phenomenon can be avoided.
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