2013年7月31日星期三
Gantry crane in the choice of the electrical part, to considering what factors?
If single girder bridge gantry crane as a cable reel speaking, then single girder gantry crane electric cable reel partial element equivalent to the above wire rope, wire rope direct impact on the entire crane hoisting mechanism operation, that is, single girder gantry crane's electrical system in a single girder gantry crane throughout the operating system, occupy a large position and plays an essential role.
Of course, this requires the staff, whether it is the Department of Design or manufacturing department, in the work process, for single girder gantry crane electrical part of the selection and design, we must strive for excellence.
Well, for single girder overhead gantry crane electrical part of the choice of material, it should pay attention to what point?
Whether it is in the choice of a motor or electrical system electrical components, the first one of the factors to consider are: continuous electrical connection rate. Because when the electrical connection of different sizes sustained rate at run time, the electrical current or power output of the system is not the same, if the electrical connection sustained rate is too low, then work in a fixed cycle, single girder gantry crane electrical systems will become shorter working hours, which is certainly not the result we want.
We all know how many times the electrical connection is a single girder hoist gantry crane at work within a fixed period of times, so the choice of electrical components, it had to be considered in addition to the electrical connection sustained rate, we should also take multiple perspectives how much electricity times, when necessary, can be appropriate to reduce the motor rated current value.
Single girder gantry crane pulley failure how to prevent it?
Current lifting machinery industry such as single girder bridge gantry crane faces three major difficulties: First, as a strong cyclical industry faces profitability pressures. The second is a capital-intensive industry is facing capital pressures. Third, as a strategic emerging industry faces competitive pressures.
In the current situation, to strengthen the lifting machinery industry guidance and policy support, especially single girder overhead gantry crane As soon as possible to establish major projects, key projects and equipment manufacturing enterprise communication and contact mechanism, timely bidding plan to corporate announcements, and guide enterprises, especially private enterprises to participate in research and development of new products to meet market demand, have the opportunity to participate in market competition, encourage and support enterprises through joint research, development and other forms of cooperation, participation in national key projects and major projects. At the same time, increase efforts to support the equipment manufacturing industry, the implementation of a more active financing credit policy more favorable land-use policies, and more inclined fiscal policies, such as domestic first full VAT refund and purchase full deduction, simplifying first domestic certification process, to establish use of domestic first equipment risk compensation mechanism
Single girder hoist gantry crane pulley failure how to prevent it?
1 Check whether the material evenly, installation meets the requirements, ropes and wheel contact is good;
2 mandrels and rope regularly checked for wear;
3-axis positioning regularly check for loose parts, wire rope is quit;
4 Check regularly single girder gantry crane pulley wear.
Our single girder gantry crane market is very uneven pattern
Of the construction machinery industry is facing the lack of construction of core components, single girder
overhead gantry crane industry is no exception. In recent years, China has made a breakthrough on the quality of the
steel crane to some extent, has received international recognition, not only to increase the volume of exports of the product, but also cultivate a Chinese brand products, and other products forming the construction machinery industry interrelated effect, the influence is very significant.
(A) market continued to grow. 2012 of single girder gantry crane cumulative sales of major products, revenues, profits, and exports have maintained a positive growth year on year. But in addition to steady growth in truck-mounted cranes, other product year, the chain many months of negative growth, the enterprise should be based on actual market demand careful development.
(2) continued strong leading enterprises. Continuing strength of enterprises, but also as the crane industry leading enterprises, led the entire industry's market prosperity. Construction Crane launch new products, especially single girder bridge gantry crane development more attention.
(3) business costs continue to rise. The main raw material prices remain higher; energy, crude oil prices climbed, pushing up production costs of enterprises. With the pay levels of workers to upgrade and increase consumption, labor costs continue to increase. Global excess liquidity, inflation remained high.
(4) market structure is still uneven. Single girder gantry crane market structure is still very uneven. TNCs, with its great strength enhancing competitiveness in the Chinese market; domestic share is concentrated in just a few large companies who trade in low value-added production chain on the vicious competition, making the scene even more confusing.
(A) market continued to grow. 2012 of single girder gantry crane cumulative sales of major products, revenues, profits, and exports have maintained a positive growth year on year. But in addition to steady growth in truck-mounted cranes, other product year, the chain many months of negative growth, the enterprise should be based on actual market demand careful development.
(2) continued strong leading enterprises. Continuing strength of enterprises, but also as the crane industry leading enterprises, led the entire industry's market prosperity. Construction Crane launch new products, especially single girder bridge gantry crane development more attention.
(3) business costs continue to rise. The main raw material prices remain higher; energy, crude oil prices climbed, pushing up production costs of enterprises. With the pay levels of workers to upgrade and increase consumption, labor costs continue to increase. Global excess liquidity, inflation remained high.
(4) market structure is still uneven. Single girder gantry crane market structure is still very uneven. TNCs, with its great strength enhancing competitiveness in the Chinese market; domestic share is concentrated in just a few large companies who trade in low value-added production chain on the vicious competition, making the scene even more confusing.
Rail size tolerances and heat treated rails Introduction
Rail section size and flatness deviation is single girder
overhead gantry crane rail an important indicator of quality. Such as the use-sectional dimension deviation is too large, poor flatness rail, then it is difficult to lay railway track quality. To ensure the smooth running of trains is required track geometry is stable, the wheel-rail contact rail head position and the width of the band of light stability, and to achieve this, a high-precision dimensions and flatness is essential rail indispensable.
Because rail weld materials, microstructure, hardness, toughness, etc. The difference with the rail base metal, welding equipment, precision level of technical proficiency operating workers, etc., will result in single girder bridge gantry crane rail welding rail joints surface is not flat. Rail welded joints in three, contact welding, pressure welding and thermite welding. Three kinds of welding methods there are differences in the quality of welded joints, thermite welding rail joints worst quality. So rail joints are welded rail track single source of irregularity. To ensure high-speed high-speed trains, smooth run and reduce the role of power between wheel and rail, the rail welded joints welding quality, flatness and put forward higher requirements. So rail is welded joint control of the track surface is not flat parts.
The hardness of the rail single girder gantry crane is an important indicator of the high hardness of the rail are generally more resistant (to match the hardness of the wheel), and its life is also increased accordingly. For the ordinary high-carbon steel rail, generally Brinell hardness of 280 ~ 300HB, but there are also low 260HB. For some special requirements for rail, such as the curve of the rail when the rail at above 800 ° C, the use of water mist cooling, so that the rail hardness 355 ~ 390HB.
Current single girder hoist gantry crane rails heat two, one is the railway works department head hardened rail track, one is iron and steel plant in the factory rails railway works departments according to the requirements of the rail hardening heat treatment, general hardened steel mills on the rail better quality. Rail plant significantly reduces the heat treatment pearlite steel body sheet spacing maximum hardness of the rail up to 400HB.
Because rail weld materials, microstructure, hardness, toughness, etc. The difference with the rail base metal, welding equipment, precision level of technical proficiency operating workers, etc., will result in single girder bridge gantry crane rail welding rail joints surface is not flat. Rail welded joints in three, contact welding, pressure welding and thermite welding. Three kinds of welding methods there are differences in the quality of welded joints, thermite welding rail joints worst quality. So rail joints are welded rail track single source of irregularity. To ensure high-speed high-speed trains, smooth run and reduce the role of power between wheel and rail, the rail welded joints welding quality, flatness and put forward higher requirements. So rail is welded joint control of the track surface is not flat parts.
The hardness of the rail single girder gantry crane is an important indicator of the high hardness of the rail are generally more resistant (to match the hardness of the wheel), and its life is also increased accordingly. For the ordinary high-carbon steel rail, generally Brinell hardness of 280 ~ 300HB, but there are also low 260HB. For some special requirements for rail, such as the curve of the rail when the rail at above 800 ° C, the use of water mist cooling, so that the rail hardness 355 ~ 390HB.
Current single girder hoist gantry crane rails heat two, one is the railway works department head hardened rail track, one is iron and steel plant in the factory rails railway works departments according to the requirements of the rail hardening heat treatment, general hardened steel mills on the rail better quality. Rail plant significantly reduces the heat treatment pearlite steel body sheet spacing maximum hardness of the rail up to 400HB.
Wireless remote control in the application of gantry crane
Wireless remote control electric
hoist gantry crane on the application of advanced technology, safe and reliable, in addition to a general air control and efficient blasting machine technical features, the more the following advantages:
1, using the SAW resonator frequency stabilization wireless remote control technology, which has a frequency stability, high feasibility, control distance of 100 meters and so on. More sensitive than the pneumatic remote control, without gas control, workers to operate more easily. And avoid the harsh environment of the scene may be gas electric hoist bridge gantry crane control damage phenomenon.
2, according to the electric hoist overhead gantry crane different codec chip, different frequencies, can guarantee 32 yuan (43 million units) without duplication. Completely avoid interfering between the remote control.
3, the use of double solenoid valve, the operation of the state with memory self-locking function, eliminating PLC. Just push the button, you can achieve sandblasting on and off, no long hold control buttons.
4, AC power 380V/220V/36V selectable receiver, transmitter power supply DC 3V (2 AA alkaline batteries can be used 5 5 months).
5, protection class IP65, temperature -35 degrees to 80 degrees.
6, the entire control system is equipped with a pressure switch, pressure in the absence of circumstances not connected to the circuit, electric hoist gantry crane remote control does not operate; in the case of low pressure blasting off automatically. Thus avoiding accidental activation solenoid valve is blasting state so that the device has a high safety and reliability.
1, using the SAW resonator frequency stabilization wireless remote control technology, which has a frequency stability, high feasibility, control distance of 100 meters and so on. More sensitive than the pneumatic remote control, without gas control, workers to operate more easily. And avoid the harsh environment of the scene may be gas electric hoist bridge gantry crane control damage phenomenon.
2, according to the electric hoist overhead gantry crane different codec chip, different frequencies, can guarantee 32 yuan (43 million units) without duplication. Completely avoid interfering between the remote control.
3, the use of double solenoid valve, the operation of the state with memory self-locking function, eliminating PLC. Just push the button, you can achieve sandblasting on and off, no long hold control buttons.
4, AC power 380V/220V/36V selectable receiver, transmitter power supply DC 3V (2 AA alkaline batteries can be used 5 5 months).
5, protection class IP65, temperature -35 degrees to 80 degrees.
6, the entire control system is equipped with a pressure switch, pressure in the absence of circumstances not connected to the circuit, electric hoist gantry crane remote control does not operate; in the case of low pressure blasting off automatically. Thus avoiding accidental activation solenoid valve is blasting state so that the device has a high safety and reliability.
Single girder gantry crane reason for the existence of assembled components and solutions
Single girder
overhead gantry crane simple structure, easy installation, the quality of their small, mostly off-track girder box-shaped frame structure. And double-girder gantry crane compared to the overall stiffness is weaker. Therefore, when the starting weight Q ≤ 50t, span S ≤ 35m, we can use this form. Single girder
bridge gantry crane doors legs with L-and C-type forms. L-manufacture and installation convenience, the force is good, the quality of their small, but, lifting cargo space through the legs at a relatively small number. The feet made of C-inclined or curved shape, the purpose is to have large lateral space to pass the goods foot.
I. Analysis:
1, single girder hoist gantry crane assembly process is unreasonable.
2, the assembly node size does not meet the design requirements.
Second, the solution:
1, component assembly to be set up assembly table, positioning welding to single girder gantry crane component leveling underside to prevent warping. The level of the pivot table should be assembled, to prevent welding in welding deformation. In particular beam segment or stairway final assembly, to adjust the positioning after welding deformation, pay attention to the node size to meet the design requirements, otherwise easily lead to component distortion.
2, own less rigid member, stood before welding reinforcement, components should be carried out after leveling stand, or component can not be corrected after welding.
3, component bagging, value greater than single girder gantry crane design value, easy to produce extruded surface elevation exceeded; value is less than the design value, install rear spar lower torsion.
I. Analysis:
1, single girder hoist gantry crane assembly process is unreasonable.
2, the assembly node size does not meet the design requirements.
Second, the solution:
1, component assembly to be set up assembly table, positioning welding to single girder gantry crane component leveling underside to prevent warping. The level of the pivot table should be assembled, to prevent welding in welding deformation. In particular beam segment or stairway final assembly, to adjust the positioning after welding deformation, pay attention to the node size to meet the design requirements, otherwise easily lead to component distortion.
2, own less rigid member, stood before welding reinforcement, components should be carried out after leveling stand, or component can not be corrected after welding.
3, component bagging, value greater than single girder gantry crane design value, easy to produce extruded surface elevation exceeded; value is less than the design value, install rear spar lower torsion.
2013年7月30日星期二
China will become the number of foreign construction machinery enterprises battleground
With the recent construction of large infrastructure, energy, industry, real estate industry, the petrochemical industry and other industrial and shipbuilding industry's rapid development has greatly promoted China's single girder
overhead gantry crane and other heavy machinery manufacturing industry, some of the best heavy machinery the rise of manufacturing enterprises, China's crane industry is also among the world's
hoist gantry crane s are increasingly making powers.
Since the 1980s, the single girder gantry crane, the country in the full absorption of foreign advanced technology, based on lifting machinery, began to introduce digestion of foreign technology, lifting products and localization of key components to become technological development mainstream.
After years of development, Chinese enterprises have the ability crane on existing technology innovation, research and development to meet the domestic and foreign market demand for personalized construction machinery and road machinery and other applications of various products. Up to now, our product range of lifting machinery industry has more than 1000, and there are always new lifting equipment come out.
In recent years, the domestic basic industries and infrastructure driven by large-scale development, energy, real estate, petrochemicals, logistics, shipbuilding industry, metallurgical industry, machinery processing, aviation industry and container industry developed rapidly, driven by our single girder bridge gantry crane manufacturing industry rapid development, the emergence of a group of outstanding crane manufacturers.
World crane market is further towards integration, and some developed countries in Europe and America crane market has become saturated, foreign giants continue to enter China, with its advantages in technology to seize the Chinese market, China has become a large foreign construction machinery enterprises will compete land. As China's equipment manufacturing industry to increase efforts to support our single girder gantry crane manufacturing industry is expected to maintain a rapid development, is expected in 2012 China's crane manufacturing industry sales revenue, total profit will continue to grow, but growth will slowed. Our equipment leasing industry has gradually mature and develop, finance lease crane industry will become a strong driving force for future growth.
Since the 1980s, the single girder gantry crane, the country in the full absorption of foreign advanced technology, based on lifting machinery, began to introduce digestion of foreign technology, lifting products and localization of key components to become technological development mainstream.
After years of development, Chinese enterprises have the ability crane on existing technology innovation, research and development to meet the domestic and foreign market demand for personalized construction machinery and road machinery and other applications of various products. Up to now, our product range of lifting machinery industry has more than 1000, and there are always new lifting equipment come out.
In recent years, the domestic basic industries and infrastructure driven by large-scale development, energy, real estate, petrochemicals, logistics, shipbuilding industry, metallurgical industry, machinery processing, aviation industry and container industry developed rapidly, driven by our single girder bridge gantry crane manufacturing industry rapid development, the emergence of a group of outstanding crane manufacturers.
World crane market is further towards integration, and some developed countries in Europe and America crane market has become saturated, foreign giants continue to enter China, with its advantages in technology to seize the Chinese market, China has become a large foreign construction machinery enterprises will compete land. As China's equipment manufacturing industry to increase efforts to support our single girder gantry crane manufacturing industry is expected to maintain a rapid development, is expected in 2012 China's crane manufacturing industry sales revenue, total profit will continue to grow, but growth will slowed. Our equipment leasing industry has gradually mature and develop, finance lease crane industry will become a strong driving force for future growth.
Lifting in the future will face a huge market demand
In the future, will continue lifting the huge demand for the current scene. Main reasons:
From a policy perspective, the national "five" development planning documents explicitly put forward the "stick strategy of expanding domestic demand and maintain stable and rapid economic development," and that the government was fully aware of the enormous potential of expanding domestic demand, combined with China's reality, Some people's livelihood projects, especially bridges and other infrastructure, housing construction, will be further strengthened in the future of electric hoist gantry crane and other lifting machinery demand will grow.
From the industry point of view of their own development, national requirements "to ensure stable development of equipment manufacturing industry, accelerate structural adjustment, enhance independent innovation capability, enhance the level of autonomy, promote industrial upgrading." There are already many companies in the electric hoist gantry cranes and other machinery technically mature, has a competitive edge on the international stage, in 2011 the global steel crane industry top ten list of enterprises in China accounted for four seats. Can be said that China lifting machinery industry developed well, strength.
From market development, national planning lifting emerging industry will be another focus area development. Especially the wind power industry, offshore oil exploration and other fields, will drive the electric hoist overhead gantry crane and other lifting machinery sales.
From the current development trend, lifting machinery gradually to specialization and large-scale development. Market electric hoist gantry crane species continues to introduce new products with unique features to meet different customer's needs, by the majority of users of all ages, the market is also expanding. Meet various operational needs of the crane constantly being developed and put into use, there are nuclear power, paper, waste disposal and other special cranes. And a special performance of the crane can meet a variety of work environments, such as corrosion, explosion-proof, insulated cranes. Conventional rail, ship-specific performance of the crane is also growing, adaptability to the environment is also rising.
From a policy perspective, the national "five" development planning documents explicitly put forward the "stick strategy of expanding domestic demand and maintain stable and rapid economic development," and that the government was fully aware of the enormous potential of expanding domestic demand, combined with China's reality, Some people's livelihood projects, especially bridges and other infrastructure, housing construction, will be further strengthened in the future of electric hoist gantry crane and other lifting machinery demand will grow.
From the industry point of view of their own development, national requirements "to ensure stable development of equipment manufacturing industry, accelerate structural adjustment, enhance independent innovation capability, enhance the level of autonomy, promote industrial upgrading." There are already many companies in the electric hoist gantry cranes and other machinery technically mature, has a competitive edge on the international stage, in 2011 the global steel crane industry top ten list of enterprises in China accounted for four seats. Can be said that China lifting machinery industry developed well, strength.
From market development, national planning lifting emerging industry will be another focus area development. Especially the wind power industry, offshore oil exploration and other fields, will drive the electric hoist overhead gantry crane and other lifting machinery sales.
From the current development trend, lifting machinery gradually to specialization and large-scale development. Market electric hoist gantry crane species continues to introduce new products with unique features to meet different customer's needs, by the majority of users of all ages, the market is also expanding. Meet various operational needs of the crane constantly being developed and put into use, there are nuclear power, paper, waste disposal and other special cranes. And a special performance of the crane can meet a variety of work environments, such as corrosion, explosion-proof, insulated cranes. Conventional rail, ship-specific performance of the crane is also growing, adaptability to the environment is also rising.
Single girder gantry crane gear installation steps
With the national electric power, petrochemical, steel, transportation and other infrastructure construction reached a climax, the domestic single girder overhead gantry crane with rapid market expansion, the trend of large crane has become an irreversible fact. In order to reduce production costs, saving manpower and resources, the demand for large cranes has gradually expanded. The requirements for crane lifting capacity is growing, lifting speed is becoming more demanding, it is bound on the energy performance of the control and cranes have become increasingly demanding.
As automated production process in the important part of the operational aspects of a simple, safe, reliable performance, easy maintenance are the basic requirements for hoist gantry crane s, in addition, the high cost of lifting machinery will be more in the future market.
Today, as we introduce single girder gantry crane gear installation steps:
1 with a feeler lateral backlash gear, shall comply with the relevant provisions of its minimum value, if measured with the pressure of lead, the lead wire along the outer edge of Busi gear tooth pitch length of not less than five, turning gear, the gear will be lead wire flattening, remove, respectively, with flattened lead wire micrometer thickness, the minimum value should be specified.
2 with Hongdan coloring, Inspection Measurement single girder gantry crane gear contact case, is: Hongdan thin and evenly on both sides of the pinion tooth surface, turn the high speed shaft, the large gear pros direction of rotation, see contact marks, and calculate the percentage of contacts whose values should be consistent with the relevant requirements.
3 single girder bridge gantry crane installation and adjustment of open gear requirements above, but can reduce the contact point precision grade 1-2 level, according to the 8-9 level checks.
Single girder gantry crane buffer device has what?
Single girder steel crane simple structure, easy installation, the quality of their small, mostly off-track girder box-shaped frame structure. And double-girder gantry crane compared to the overall stiffness is weaker. Therefore, when the starting weight Q ≤ 50t, span S ≤ 35m, we can use this form. Single girder gantry crane doors legs with L-and C-type forms. L-manufacture and installation convenience, the force is good, the quality of their small, but, lifting cargo space through the legs at a relatively small number. The feet made of C-inclined or curved shape, the purpose is to have large lateral space to pass the goods foot.
Single girder bridge gantry crane buffer device is divided into three categories: physical buffers, spring buffers, shock absorber
One is the physical buffer. Buffer is divided into physical and polyurethane rubber buffers buffer. Both have their own characteristics, rubber buffer structure is simple, can play a role in blocking, while its low price, long life, installation and maintenance is also very convenient, thus Polyurethane buffers currently in the more extensive use of international .
One is spring buffer. Spring buffer structure is very simple, of a total of three parts, namely, meet, springs and housings. Its main task is the principle of spring buffer hoist gantry crane crash when the energy can be transformed into a compression spring, in order to prevent accidents, ensure the single girder overhead bridge crane safety and reliability.
Finally, hydraulic buffers. This buffer works is when a single girder gantry crane collision, hydraulic buffers to allow all parts of the crane through a process in order to play a buffer role.
MH electric hoist gantry crane structure features introduced
MH type electric hoist gantry crane for working-level A2-A5, working environment temperature -25-40 ℃, applicable from the weight of 3.2-12.5 t; span of 10-22 m, 2.5-5.5 m effective length of the cantilever, lifting height of 6-9 meters. In order to manipulate the main cab can also be manipulated using ground flashlight door. It is suitable for docks, garages, warehouses, construction sites, cement products and other field operations and small hydropower stations in open space for lifting and transport operations.
MH type electric hoist steel crane structural features:
MH type electric hoist gantry crane from the mast (main beam, legs and lower beams, etc.), electric hoist, crane operating agencies and electric control parts. These departments body are:
1 box-girder beam or an H-shaped steel beam, channel steel welding legs, lower beam channel steel welding or using box-shaped beams.
(2) with the introduction of electric hoist electric hoist technical standard AS or domestically developed H-type electric hoist, electric hoist hanging in the bottom flange on the main beam
3. MH electric hoist bridge gantry crane operation mechanism consists of motor, hydraulic coupling, hydraulic pusher brakes, gearbox and wheel components can also be used to run triple agency.
4. MH electric hoist gantry crane lifting, transverse, longitudinal limit switch protection or have a buffer device and a windproof folder track safety device.
Single girder gantry crane control circuit What are the characteristics?
1, single girder steel crane with a reversible asymmetric circuits.
2, the master controller file number 3-0-3,11 loops.
3, single girder gantry crane series resistor in series with the motor rotor
4 down "a" file is an inverted pull reverse braking files, enabling heavy loads slow decline.
5, down "2" file as a single-phase brake file, realize light load low speed fall.
6, down "3" file as regenerative braking file, get above synchronous speed of high-speed fall.
7, single girder bridge gantry crane parking, the circuit components to ensure the brake before driving motor 0.6s power outages, prevent slip hook.
8, using the time delay relay KT1 reversible motor run the conversion time, to prevent contactor KM1-KM3, KM3-KM2 reversible phase transition may cause a short circuit.
9, heavy loads, in some cases need to frequently use the jog operation, for single girder overhead gantry crane controller to "0" - "down 2" to "0" operation.
2013年7月29日星期一
Development of lifting machinery, which aspects need to strengthen awareness
It is understood that China's lifting machinery manufacturing enterprises are only a few large firms have better long-term production and operation plans, many SMEs do not have a good long-term production and operation plans, which to some extent, restricted the lifting machinery enterprise development . Electric
hoist gantry crane and other lifting machinery manufacturing enterprises, information technology, including the general content management information, engineering information technology, manufacturing automation, quality assurance, information and other content.
In engineering design, lifting machinery manufacturing enterprises of some large crane manufacturing enterprises in the engineering design aspects of information technology started earlier, and some have set up a dedicated R & D team, they use advanced computer technology to steel crane design, graphics, and virtual assembly. Currently, SMEs are gradually lifting machinery manufacturing these technologies will be applied to the lifting machinery product development, manufacturing and testing of other sectors, which has greatly improved the electric hoist gantry crane and other mechanical engineering degree of information. "
Currently automation products in China electric hoist gantry crane and other lifting machinery market prospects for development, to strengthen the understanding of three areas:
First of all, can not let the technical standards limiting the lifting machinery product design and application of automation products. Foreign companies are designed in accordance with customer demand diverse range of products to meet market demand, flexible. But many domestic provisions are too specific, so that over a single product type;
Second, the domestic application of the relative lack of technical personnel, technical requirements for high crane electronic control system requires companies to complete the training, so the pre-market training needs further intensify;
Finally, the domestic electric hoist gantry crane and other lifting machinery prices are relatively low, but not in order to control costs, and reduce the proportion of automated product applications, this approach often outweigh the benefits.
In engineering design, lifting machinery manufacturing enterprises of some large crane manufacturing enterprises in the engineering design aspects of information technology started earlier, and some have set up a dedicated R & D team, they use advanced computer technology to steel crane design, graphics, and virtual assembly. Currently, SMEs are gradually lifting machinery manufacturing these technologies will be applied to the lifting machinery product development, manufacturing and testing of other sectors, which has greatly improved the electric hoist gantry crane and other mechanical engineering degree of information. "
Currently automation products in China electric hoist gantry crane and other lifting machinery market prospects for development, to strengthen the understanding of three areas:
First of all, can not let the technical standards limiting the lifting machinery product design and application of automation products. Foreign companies are designed in accordance with customer demand diverse range of products to meet market demand, flexible. But many domestic provisions are too specific, so that over a single product type;
Second, the domestic application of the relative lack of technical personnel, technical requirements for high crane electronic control system requires companies to complete the training, so the pre-market training needs further intensify;
Finally, the domestic electric hoist gantry crane and other lifting machinery prices are relatively low, but not in order to control costs, and reduce the proportion of automated product applications, this approach often outweigh the benefits.
Rail clamp on the application of gantry crane
According to GB6067 --- 85 "crane safety regulations" states: open-air work, single girder
bridge gantry crane rail clamp should be set up, anchoring devices or iron shoes. For outdoor work on the track crane rail clamp pliers and its anchoring device or iron shoes should be able to withstand non-working state when you are not the subject at the maximum wind blown.
Locomotive rail clamp and clamp shaft through the hole in the back-end connections, locomotives when walking, dragging (push) synchronous dynamic rail clamp is moved, the guide rail clamp wheel in under the pressure of the weight of rolling along the serpentine track, and by the Idler bracket, guide rail clamp pliers whole drive shaft in a fixed axis along the track surface float. Automatic rail clamp can automatically single girder overhead gantry crane locked in orbit, in order to prevent accidental thrust sometimes slip by. Rail clamp automatically open the car traversing the state, other states automatically clamped. Control system adopts Siemens PLC control. Without changing the original machine operator action under the premise of the crane through the PLC system and stop walking walking mechanism, brakes and brake open, rail clamp opening and clamping other actions to implement automatic control, improve the overall stability of the and safety.
Prevent strong wind outdoor cranes glide along the rail crane safety device. Usually with a single girder hoist gantry crane at the bottom of the clamp structure connected together, the head of the two sides of the track grip to prevent sliding. Rail clamp of manual and electric type two (see Figure). Hand rail clamp screw is generally simple structure, but the clamping force is small and slow, mainly for the small size of the windshield or temporary use small cranes. Large cranes or port cranes used mainly electric rail clamp. It is made by a lever or hammer spring force clamp clamping rail, by force of the hydraulic system of the cylinder release clamp.
Heavy hammer more cumbersome dimensions large clamping force smaller than the spring, the work is not as smooth spring style. Electric spring rail clamp achieved through anemometer with crane electrical interlock, when anemometer wind reaches the crane can not guarantee the normal operation of wind (usually corresponding to 6 to 7), the single girder gantry crane power , clamps grip the track. This folder track work and high reliability.
Locomotive rail clamp and clamp shaft through the hole in the back-end connections, locomotives when walking, dragging (push) synchronous dynamic rail clamp is moved, the guide rail clamp wheel in under the pressure of the weight of rolling along the serpentine track, and by the Idler bracket, guide rail clamp pliers whole drive shaft in a fixed axis along the track surface float. Automatic rail clamp can automatically single girder overhead gantry crane locked in orbit, in order to prevent accidental thrust sometimes slip by. Rail clamp automatically open the car traversing the state, other states automatically clamped. Control system adopts Siemens PLC control. Without changing the original machine operator action under the premise of the crane through the PLC system and stop walking walking mechanism, brakes and brake open, rail clamp opening and clamping other actions to implement automatic control, improve the overall stability of the and safety.
Prevent strong wind outdoor cranes glide along the rail crane safety device. Usually with a single girder hoist gantry crane at the bottom of the clamp structure connected together, the head of the two sides of the track grip to prevent sliding. Rail clamp of manual and electric type two (see Figure). Hand rail clamp screw is generally simple structure, but the clamping force is small and slow, mainly for the small size of the windshield or temporary use small cranes. Large cranes or port cranes used mainly electric rail clamp. It is made by a lever or hammer spring force clamp clamping rail, by force of the hydraulic system of the cylinder release clamp.
Heavy hammer more cumbersome dimensions large clamping force smaller than the spring, the work is not as smooth spring style. Electric spring rail clamp achieved through anemometer with crane electrical interlock, when anemometer wind reaches the crane can not guarantee the normal operation of wind (usually corresponding to 6 to 7), the single girder gantry crane power , clamps grip the track. This folder track work and high reliability.
2013年7月28日星期日
Machinery market's lack of confidence in the future is expected to
The current economic operation of the basic machinery industry is characterized by "slow recovery, moderate growth and steady development", the main difficulty remains the
overhead gantry crane and other machinery products demand, overcapacity, rising costs, highlighting the highlight of extension and expansion cooling, innovation becomes hot market Forced transformation. Looking ahead, it is expected neither rose nor fell, still mainly smooth tone.
Recommends that the Government not to use short-term stimulus strong pull speed, but should strengthen market discipline bridge gantry crane machinery competition, promote survival of the fittest; Meanwhile, enterprises should take advantage of domestic resources, cultivate high-end brands.
Changes from growth, the recent pick-up over the previous year. Among them, the rise of private enterprises contributed the most.
From the profit point of view, an increase over the previous year significantly improved, but mainly rely on lifting machinery industries. Expected in the future gantry crane industry profits may not be able to continue high growth, other than machinery industry profit growth is expected to moderate rebound. It is noteworthy that, the main income margin declined over the previous year, indicating that rising costs, lower prices are still the principal contradiction, it will not help profit growth.
From the fixed asset investment perspective, not only sustained growth gantry crane fell sharply, and is now lower than the same period of the whole society and the All Manufacturing; not only increase already very low, and continues to decline. This not only shows significant cooling heat capacity expansion, but also reflects the machinery business in the future is expected to lack of confidence.
Recommends that the Government not to use short-term stimulus strong pull speed, but should strengthen market discipline bridge gantry crane machinery competition, promote survival of the fittest; Meanwhile, enterprises should take advantage of domestic resources, cultivate high-end brands.
Changes from growth, the recent pick-up over the previous year. Among them, the rise of private enterprises contributed the most.
From the profit point of view, an increase over the previous year significantly improved, but mainly rely on lifting machinery industries. Expected in the future gantry crane industry profits may not be able to continue high growth, other than machinery industry profit growth is expected to moderate rebound. It is noteworthy that, the main income margin declined over the previous year, indicating that rising costs, lower prices are still the principal contradiction, it will not help profit growth.
From the fixed asset investment perspective, not only sustained growth gantry crane fell sharply, and is now lower than the same period of the whole society and the All Manufacturing; not only increase already very low, and continues to decline. This not only shows significant cooling heat capacity expansion, but also reflects the machinery business in the future is expected to lack of confidence.
2013 Lifting improved macroeconomic
Since 2012 Universal
overhead gantry crane slowing demand growth downward more than two years has been a difficult day. Nevertheless, we still hope that the introduction of short-term stimulus policies to strong pull speed, because the "upgrade" to cross this off sooner or later. Although short-term stimulus could accelerate at one time, but only delayed the time of crisis. Cure or to rely on a market order of fair competition under the Forced mechanism to stimulate endogenous development vitality. Forced mechanism has now come into play, should continue to insist on progress.
Government's primary responsibility is to regulate the market order, to create a "superior can win, bad been eliminated," the fair competitive environment. Well, as long as the tube universal gantry crane market environment, Forced mechanism, there will be a number of outstanding companies stand out and lead the entire industry to upgrade.
Financial expenses and the increase in interest expenses dropped significantly, indicating universal bridge gantry crane corporate financing environment has improved, which is conducive to enterprise financial cost control. Though still higher than the corresponding increase in accounts receivable and sales growth, but has ended up settling; Description loan recovery, though still difficult, but the risk of excessive growth of receivables being brought under control. Inventories increased, especially the increase in the finished product which has been reduced to a low level, indicating that "to stock" has achieved remarkable results. This has created the conditions for future economic recovery.
2013 macroeconomic environment has been warmer than the previous year, but to a limited extent, expected 2013 Universal hoist gantry crane and other machinery industry is expected to achieve economic operation speed of growth of about 10 percent.
Government's primary responsibility is to regulate the market order, to create a "superior can win, bad been eliminated," the fair competitive environment. Well, as long as the tube universal gantry crane market environment, Forced mechanism, there will be a number of outstanding companies stand out and lead the entire industry to upgrade.
Financial expenses and the increase in interest expenses dropped significantly, indicating universal bridge gantry crane corporate financing environment has improved, which is conducive to enterprise financial cost control. Though still higher than the corresponding increase in accounts receivable and sales growth, but has ended up settling; Description loan recovery, though still difficult, but the risk of excessive growth of receivables being brought under control. Inventories increased, especially the increase in the finished product which has been reduced to a low level, indicating that "to stock" has achieved remarkable results. This has created the conditions for future economic recovery.
2013 macroeconomic environment has been warmer than the previous year, but to a limited extent, expected 2013 Universal hoist gantry crane and other machinery industry is expected to achieve economic operation speed of growth of about 10 percent.
How to promote crane sales and output balance
hoist gantry crane from the current industry size, growth rate, favorable policies such as the development trend, SMEs should actively develop product technology, optimize the product structure, foster brand value. In the information technology development today, lifting machinery enterprises to ensure product quality at the same time, they should seek a balance can promote the sales network of sales and output path.
A long-term, China's market overhead gantry crane is still inseparable from the orderly development of policy guidance and support. Relevant departments should play a guiding role in science, focused on solving the crane industry overcapacity, technology upgrades and other policies have practical significance. After all, the lack of appropriate norms for guidance, the huge market opportunities or industry, it may be a crisis.
Nevertheless, gantry cranes and construction industry and economic development are closely related, lifting machinery industry for quite a long period of time is still the market. Therefore, China's crane industry wants rational development, first of all we should abandon the price war. Only companies with a superior product safety and reliability in order to continuously expand the market space, optimizing industrial structure, secured market and get more development resources and technical sources.
Lifting equipment factory that bridge gantry crane industry needs multilateral cooperation, especially as such a professional factory store electronic business platform of cooperation. Small crane enterprises 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.
A long-term, China's market overhead gantry crane is still inseparable from the orderly development of policy guidance and support. Relevant departments should play a guiding role in science, focused on solving the crane industry overcapacity, technology upgrades and other policies have practical significance. After all, the lack of appropriate norms for guidance, the huge market opportunities or industry, it may be a crisis.
Nevertheless, gantry cranes and construction industry and economic development are closely related, lifting machinery industry for quite a long period of time is still the market. Therefore, China's crane industry wants rational development, first of all we should abandon the price war. Only companies with a superior product safety and reliability in order to continuously expand the market space, optimizing industrial structure, secured market and get more development resources and technical sources.
Lifting equipment factory that bridge gantry crane industry needs multilateral cooperation, especially as such a professional factory store electronic business platform of cooperation. Small crane enterprises 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.
Demolition work lifting some of the considerations
1, General overhead gantry crane crane demolition job site location station car skids treatment to ensure adequate capacity;
2, lifting slings used in the process may not have broken wire, surface rust, scratches and other defects, not to overload;
3, common gantry crane and rope tied and structure in the corner to pad rubber or steel tile protection;
4, lifting operations to be set up before the cordon set up special protection key positions, lifting non-staff allowed to enter the area;
5, lifting operations, was hanging objects rotating crane counterweight radius and the radius of rotation of personnel and vehicles are prohibited in residence;
6, GM gantry crane lifting process, the designated persons, requiring accurate signal louder;
7, when the leash humping hoisting rope to prevent the bump from happening;
8, Universal hoist gantry crane before erection work at height platforms, operating personnel wear seat belts, seat belts do hanging arrived with;
Gantry crane dismantling of the various components
Gantry crane will be traveling to the removal position, so that the location and legs tied to the anchor point alignment, with the embrace wind rope fixed on both ends of the legs and tighten the fixed-gourd.
sino hoist crane lifting the door to the main beam traveling ends, both ends of the wheel clogged with iron shoes to prevent slippery.
The spreader fell to the ground, remove the rope. Check the electrical cabinet of the outgoing cable nameplate are complete and accurate, and that identifies the complement. Remove the electric hoist lifting all the cables, and a good dish away. Continue to dismantle the door hanging all power and control cables.
50T electric hoist gantry crane demolition were removed using two electric hoist, electric hoist weight about 1T, requiring the magnitude of 10m, rod length 18.8m, rated lifting weight 12T. 3.5 girders removed.
Using two 50T crane lifting beams together with removal of main beam, crane support vehicles in the track between the auxiliary crane gantry crane support vehicles in the east. Center of rotation of the gantry crane to avoid embrace wind rope. At both ends of the main beam selection two ￠ 21.5 rope tied at the end of the main beam lift crane, truck crane master synchronization raised arm, so that the north west side of the main beam, turn south east, until the main beam wrong door After hanging legs, two cranes sync down the main beam to the ground. Before lifting the corner of the main girder good pad pad tile to prevent cutting steel rope. Before lifting girder ends leash rope swing in the air to prevent the main beam. Girder weight about 20T, requires both ends of the main girder crane slewing radius of 8m, rod length 24.6m, at this time the amount of load of crane 15.8T, crane hoists at this time to meet the construction requirements of construction.
overhead gantry crane outrigger removed using a main hoisting crane 50T, 50T crane with a job. Use wire rope as the lifting rope ￠ 21.5, at the corner pad good steel outrigger pads tile to prevent cutting rope. Each side of the leg weighs about 4T, 50T crane range 12m, arm length 24.6m, the amount set for the 9T, 50T crane auxiliary rope hanging two ￠ 21.5 bundled in the bottom of the legs, around the corner pad steel mat tile, two cranes safe removal.
China's construction machinery gap with foreign countries where the performance
At present, China's construction cranes and foreign level, the biggest difference than poor reliability, fault feedback rate, and feedback to the largest component parts as much, and therefore universal overhead gantry crane manufacturers obliged to OEMs under the leadership transition concepts, increase investment, improve product quality, revitalize national industry.
Industrial automation market has brought prosperity Stone Industrial busy business, as well as a leap in turnover growth. The first of these was achieved thanks to favorable external market environment. Today, China has become the world's universal bridge gantry crane manufacturing country, the manufacturing industry will inevitably bring increased automation needs.
With the domestic industrial automation market situation gradually moving towards full competition, initially thought to be "no technical content, the light will play trade" universal gantry crane channels have also long been reborn, riding the wind market paid off, finished from immature to mature, weak to strong transformation.
The forefront of the domestic industrial automation channels in the process of expanding the domestic industrial automation channels are also looking forward to the most adapt to market development. Initially, Universal gantry crane manufacturers are mostly just "traders" will take over and then sell products, and the market environment changes so that they see the technical services and the importance of marketing.
How to extend the life of gantry crane
Girder bridge gantry crane rails on the ground through the support of two rigid legs or rigid - flexible leg, forming a yard across the railroad tracks or door frame, outside the main beam extends outside leg cantilever portion can be expanded operating area, gantry crane is sometimes made into single-leg semi-gantry cranes, loading bridges is designed for loading and unloading gantry cranes, supply stations, ports and other sectors of granular materials stacker reclaimer, which features a car speed large span (usually above), high productivity (up to 500-1000t / h) or higher container gantry survey was developed in the 1980s, the aircraft, is designed to carry container pile stack and loading and unloading overhead gantry crane , such as unloading the container gantry crane.
1, first make sure that the door cranes spend the run-in period, which is the basis for long life, whether it is new or overhauled small crane engine must be run according to the rules;
2: gantry crane engine main fuel purity, such as diesel and gasoline purity is not good, make precise fit body wear, with the gap increasing, causing oil spill, drip, fuel pressure is reduced, the gap becomes larger, even cause oil blockage, cranes cavitation axle bush-burning and other serious fault;
3, ground inspection work: that regular checks fastening positions due to diesel and gasoline engines the course of the shock and vibration loads uneven impact, bolts, nuts easy to loose. There are various parts of the adjustment bolts should be checked in order to avoid damage due to loose body's accident;
4, commonly used and check regularly do when gantry crane engine maintenance work to make small hoist gantry crane operation is always maintained in good condition. To ground observation, ground inspection, found fault, and remove.
2013年7月26日星期五
Gantry crane changes in market demand situation analysis
Gantry crane changes in market demand situation analysis
According to the 2012 data show that China's hoist gantry crane
sales from sales of each model to see, small and medium-tonnage products are still the main force in the market, accounting for more than 80% of total sales cranes, especially 20 ~ 25t products, accounting for more than 50% of total sales. Large-tonnage products increased rapidly, especially in all-terrain crane sales rose rapidly, reflection of China's enterprises to improve production capacity gantry cranes and changes in market demand.
Cranes have a slow rise of the process, the current proportion of prefabricated concrete construction is increasing, lifting operations instead of part of the original site concrete pouring operations, various construction projects in the future, the pre-use of components increase will gradually increase the proportion of lifting operations to market demand, which led to the demand for overhead gantry crane .
In the new urbanization become the engine of China's economic development, construction crane manufacturing industry has formed a certain scale, gantry cranes crane around SECTOR urgently be applied. The large-tonnage cranes direction of the trend has become more uncertain.
Gantry crane is mainly used for outdoor yard, yard goods, bulk cargo loading and unloading operations. Its metal structure shaped like a door frame, bearing girder installed under two feet directly in the ground walking on the tracks, you can have both ends of the main beam overhanging cantilever. bridge gantry crane with space utilization, operating range, wide adaptability, versatility and other characteristics, widely used in the port yard.
According to the 2012 data show that China's hoist gantry crane
sales from sales of each model to see, small and medium-tonnage products are still the main force in the market, accounting for more than 80% of total sales cranes, especially 20 ~ 25t products, accounting for more than 50% of total sales. Large-tonnage products increased rapidly, especially in all-terrain crane sales rose rapidly, reflection of China's enterprises to improve production capacity gantry cranes and changes in market demand.
Cranes have a slow rise of the process, the current proportion of prefabricated concrete construction is increasing, lifting operations instead of part of the original site concrete pouring operations, various construction projects in the future, the pre-use of components increase will gradually increase the proportion of lifting operations to market demand, which led to the demand for overhead gantry crane .
In the new urbanization become the engine of China's economic development, construction crane manufacturing industry has formed a certain scale, gantry cranes crane around SECTOR urgently be applied. The large-tonnage cranes direction of the trend has become more uncertain.
Gantry crane is mainly used for outdoor yard, yard goods, bulk cargo loading and unloading operations. Its metal structure shaped like a door frame, bearing girder installed under two feet directly in the ground walking on the tracks, you can have both ends of the main beam overhanging cantilever. bridge gantry crane with space utilization, operating range, wide adaptability, versatility and other characteristics, widely used in the port yard.
Machinery large price movements cause analysis
Machinery large price movements cause analysis
2013 first half, China lifting equipment market turnover increased steadily, the industry outlook is good. But with the development of economy, the rise in prices in order to represent common overhead gantry crane crane product prices rise significantly, is not optimistic.
Universal gantry crane of the same model product price changes greatly, it is an indisputable fact. What causes it?
First, the product quality determines the price, the price also depends on the crane product cost. Cranes of different material specifications, features, safety and durability can are different, the price is different; secondly, brand affect the price. There are certain well-known enterprises in the common bridge gantry crane is definitely higher than the price of the same model with materials for small businesses, and is still popular, the most expensive on the best, which is Chinese-style thinking brought about consumer attitudes; addition, regional disparities, additional transportation costs also affect the price movements of the crane.
Price also depends on the amount and volume of purchase, this factor is generally reflected in the high-volume dealers and their customers, in general, according to the product manufacturers will significantly lower the amount of the purchase price, or by a similar increase in such a way as to maintain customer rebate .
Like General hoist gantry crane
such products, manufacturers are generally used in the sales sample let customers choose models, materials and so on. Therefore, the manufacturers did not spot a single production will need to reschedule certain production cycle, during this time, the crane will change the price of the same magnitude.
Installation Considerations instructions crane beam
Installation Considerations instructions crane beam
Universal hoist gantry crane
girder is installed at the same time should pay attention to what
1, the crane girder installation must be in Turin mouth secondary grouting concrete strength of 70% before and after lifting roof. In special cases, it may, after lifting the roof or the roof lifting simultaneously. According to the weight of a universal crane girder gantry crane lifting, such as lifting the roof has been completed, the available short boom crane or a one-man (or one word) mast.
2, stacking crane beam spot position should be arranged in close proximity to the installation location, the crane beam centering Installation Center. General car frame installation order from the column end to the other end of the sequence advances, but also from the middle to both ends of the forward.
3, crane girder general lashing lashing points. Universal overhead gantry crane beam with rings, the rings can be hooked directly lifting slings. Weight 5t crane beam above rings and rings available cards, hanging elements interconnected lifting; beam embedded rings is not set, and can be used at both ends of the portable crane hanging around the house with the card under the beam banding.
4, the installation will be using a common crane girder bridge gantry crane slowly lifted to the design position 10cm away from the bearing surface see, the use of human righting, the bearing surface of the beam centerline and the centerline (or adjacent to the crane beam centerline Ann) aligned, and to hold both ends of equal length, and then slowly fall, if any deviation is pulling with a crowbar, such as going seat uneven, with oblique iron pad level, you can be decoupled. When the beam height and width ratio greater than 4:00, when the number before the application of decoupling the beam and stub wire tied together to prevent windy dumping.
Universal hoist gantry crane
girder is installed at the same time should pay attention to what
1, the crane girder installation must be in Turin mouth secondary grouting concrete strength of 70% before and after lifting roof. In special cases, it may, after lifting the roof or the roof lifting simultaneously. According to the weight of a universal crane girder gantry crane lifting, such as lifting the roof has been completed, the available short boom crane or a one-man (or one word) mast.
2, stacking crane beam spot position should be arranged in close proximity to the installation location, the crane beam centering Installation Center. General car frame installation order from the column end to the other end of the sequence advances, but also from the middle to both ends of the forward.
3, crane girder general lashing lashing points. Universal overhead gantry crane beam with rings, the rings can be hooked directly lifting slings. Weight 5t crane beam above rings and rings available cards, hanging elements interconnected lifting; beam embedded rings is not set, and can be used at both ends of the portable crane hanging around the house with the card under the beam banding.
4, the installation will be using a common crane girder bridge gantry crane slowly lifted to the design position 10cm away from the bearing surface see, the use of human righting, the bearing surface of the beam centerline and the centerline (or adjacent to the crane beam centerline Ann) aligned, and to hold both ends of equal length, and then slowly fall, if any deviation is pulling with a crowbar, such as going seat uneven, with oblique iron pad level, you can be decoupled. When the beam height and width ratio greater than 4:00, when the number before the application of decoupling the beam and stub wire tied together to prevent windy dumping.
Common design girder gantry crane
Common design girder overhead gantry crane
Nominal weight of 5 tons, a span of 15 meters or less: use the 30th beam (posted under the reinforcing plate thickness 8 mm);
hoist gantry crane Nominal weight of 5 tons, a span of 15 to 28 meters when: selection of 36 beam (posted under the reinforcement plate thickness 8 mm);;
Nominal weight of 5 tons, a span of 28 to 35 meters when: selection of 40 beam (posted under the reinforcement plate thickness 8 mm);;
Nominal weight of 10 tons, a span of 15 to 28 meters when: selection of 40 beam (thickness 10 mm under paste reinforcement plate);
Nominal weight of 10 tons, a span of 28 to 35 meters when: selection 40-45 I-beam (thickness 10-12 mm under paste reinforcement plate);
Nominal weight of 15 tons, a span of 28 to 35 meters when: 50-56 selection beam (posted under the reinforcing plate thickness 16 mm);
Nominal weight of 5 tons, a span of 15 meters or less: use the 30th beam (posted under the reinforcing plate thickness 8 mm);
hoist gantry crane Nominal weight of 5 tons, a span of 15 to 28 meters when: selection of 36 beam (posted under the reinforcement plate thickness 8 mm);;
Nominal weight of 5 tons, a span of 28 to 35 meters when: selection of 40 beam (posted under the reinforcement plate thickness 8 mm);;
Nominal weight of 10 tons, a span of 15 to 28 meters when: selection of 40 beam (thickness 10 mm under paste reinforcement plate);
Nominal weight of 10 tons, a span of 28 to 35 meters when: selection 40-45 I-beam (thickness 10-12 mm under paste reinforcement plate);
Nominal weight of 15 tons, a span of 28 to 35 meters when: 50-56 selection beam (posted under the reinforcing plate thickness 16 mm);
Gantry crane manufacturer describes the design of the cab
overhead gantry crane manufacturer describes the design of the cab:
①, interior clear height: 2000 mm.
②, the top pressure: 2000N / m ^ 2.
③, internal fire retardant materials.
④, panel thickness generally take 1-1.2 mm.
⑤, the driver good sight.
⑥, chairs used by the crane driver GB selection.
⑦, the windows of hoist gantry crane can be opened.
⑧, tempered glass, laminated, organic. Thickness: 5%.
①, interior clear height: 2000 mm.
②, the top pressure: 2000N / m ^ 2.
③, internal fire retardant materials.
④, panel thickness generally take 1-1.2 mm.
⑤, the driver good sight.
⑥, chairs used by the crane driver GB selection.
⑦, the windows of hoist gantry crane can be opened.
⑧, tempered glass, laminated, organic. Thickness: 5%.
Ladder gantry crane design
①, climb the ladder overhead gantry crane installation location: arranged at the rigid legs.
②, ladder width: 600 mm.
③, ladders main limb: thickness 3 mm with folded trough. Also channel 12 can be used directly.
④, stepping ladder: textured board with a 3 mm thick hems production. Short side about 5 mm high.
⑤, ladders on both sides of the fence. Wire and tube production.
⑥, ladder and outrigger design with high contact at the 100-150 mm high stand. Standoffs with the 12th channel welded together. Generally have 3-4 stand.
⑦, at no fence into the cab. There is the other side of the main limb ladder fence and a pass to top.
⑧, enter the cab platform upwards 1600-1800 millimeters. There is a handle. For the driver's cab from the platform to the step ladder leg, hand grasp with. Objective: To secure.
⑨, bridge gantry crane ladder stepping interval set by the requirements of ergonomics. Typically 250-300 mm.
Gantry frame line winding. Generally choose what size angle
overhead gantry crane frame line winding. Generally choose what size angle
Frame for the two main lines. Double angle as a group. Total: 4. Generally used L63X63X6 to 125X125X12 specifications angle.
Nominal weight of 5 tons, a span of 15 meters or less: generally used L63X63X6.
Nominal weight of 5 tons, a span of 28 to 35 meters when: generally used L80X80X8.
Nominal weight of 10 tons, a span of 15 to 28 meters when: generally used L80X80X8 to L100X100X10 specifications angle.
Nominal weight of 15 tons, a span of 28 to 35 meters when: generally used L125X125X12.
bridge gantry crane frame internal oblique abdominal line pole, generally used in what size angle
Double angle as a group.
Nominal weight of 5 tons, a span of 15 meters or less: generally used L50X505 to L63X63X6.
Nominal weight of 5 tons, a span of 28 to 35 meters when: generally used L70X70X7 to L80X80X8.
Nominal weight of 10 tons, a span of 15 to 28 meters when: generally used L80X80X8 to L100X100X10 specifications angle.
Nominal weight of 15 tons, a span of 28 to 35 meters when: generally used L100X100X10 to L125X125X12.
Girder gantry crane trolley design
overhead gantry crane trolley beam design:
①, outrigger connection Zama determine the size: the leg plane, the horizontal angle of the legs is generally 70-75 degrees. The horizontal distance calculation, set: B1. The distance between the top leg to B2. The outrigger connection Zama size (set B3):
②, walking round carts between dimensions (wheelbase) to determine: ⑴, press leg extension cord diagonally arranged. ⑵, determine carts travel drive dimensions. ⑶, angular dimensions to determine the axle seat. ⑷, the conclusion that the dimensions between the running wheel carts (wheelbase).
③, trolley beam central structure: generally battened lattice dual channel. 5 tons gantry crane is generally :18-22 channel.
10 tons hoist gantry crane is generally :25-40 channel. 15 tons gantry crane is generally: welded box.
④, calculate: ⑴, according to Charpy with cantilevers to determine its strength. ⑵, deflection calculations: Permissible values are: (1/400) * B4. (B4-wheelbase)
⑤, structure taking the thinnest thickness: 10 mm.
⑥, gear box bearing plate to take the thinnest thickness: 16 mm. To satisfy the stiffness requirements.
⑦, outrigger plate flange thickness generally taken: 20 mm.
⑧, outrigger plate flange bolts M20. Flange diameter: 22.
Calculation of gantry crane flexible leg
1, the car load stop at the side of the flexible cantilever leg end. Calculate the maximum support flexible leg reaction force. If there is no full stop at the car boom is flexible leg center.
2, a flexible leg channel formed by the two sets of uprights. Struts its stability calculation in both directions. The maximum of bridge gantry crane load is flexible leg supporting forces.
3, for the two directions of single limb strut slenderness ratio calculation. Allowable slenderness ratio: 150.
4, calculated on the single-piece parts: such as: battens; connecting rod; plate;
5, manufacture weld; installation welds.
6, hoist gantry crane walking carts breaking legs when conditions force OK. The bending strength calculation.
2, a flexible leg channel formed by the two sets of uprights. Struts its stability calculation in both directions. The maximum of bridge gantry crane load is flexible leg supporting forces.
3, for the two directions of single limb strut slenderness ratio calculation. Allowable slenderness ratio: 150.
4, calculated on the single-piece parts: such as: battens; connecting rod; plate;
5, manufacture weld; installation welds.
6, hoist gantry crane walking carts breaking legs when conditions force OK. The bending strength calculation.
Calculation of rigid gantry crane outrigger
Calculation of rigid
overhead gantry crane outrigger
1, the car load stop at the side of the rigid leg cantilever end. Calculate the maximum rigid leg support reaction force. If there is no boom is fully loaded car parked in the center of the rigid leg.
2, a rigid leg channel formed by the two sets of uprights. bridge gantry crane recommends either of two directions of a group strut stability calculation. The maximum load for the rigid leg support reaction force. Bending moment and shear by another group of columns to balance (can not be counted). This is a simplified calculation method is convenient and safe.
3, for the two directions of single limb strut slenderness ratio calculation. Allowable slenderness ratio: 150.
4, calculated on the single-piece parts: such as: battens; connecting rod; plate;
5, manufacture weld; installation welds.
1, the car load stop at the side of the rigid leg cantilever end. Calculate the maximum rigid leg support reaction force. If there is no boom is fully loaded car parked in the center of the rigid leg.
2, a rigid leg channel formed by the two sets of uprights. bridge gantry crane recommends either of two directions of a group strut stability calculation. The maximum load for the rigid leg support reaction force. Bending moment and shear by another group of columns to balance (can not be counted). This is a simplified calculation method is convenient and safe.
3, for the two directions of single limb strut slenderness ratio calculation. Allowable slenderness ratio: 150.
4, calculated on the single-piece parts: such as: battens; connecting rod; plate;
5, manufacture weld; installation welds.
gantry crane calculation method: Section Method
gantry crane calculation method: Section Method
Winding calculation: Line frame by bending moment diagram chord distribution, the maximum span moment. Respectively, in the vertical plane and the horizontal plane is calculated. Beam weight allocated by node. Hoists and hoist gantry crane were acting cantilever end and cross, in order to focus. Dynamic load factor of K1 = 1.2, overload factor can take K2 = 1.25 (based on usage to determine whether to take the value). Vertical and horizontal axial force is calculated, and then the synthesis. Horizontal plane by the wind load and the load hoist horizontal force deflection combination.
overhead gantry crane manufacturers feel the level of force deflection hoists from 5 degrees yaw angle. Wind load frame and hanging by a line consisting of heavy windward side. Rated capacity 5 tons when: lifting the windward side is 8 meters. Lifting capacity 10 tons when: lifting the windward side is 10 square meters. Selected maximum axial force, for the calculation of the stability lever. Double angle should be considered in both directions. Allowable slenderness ratio: 120. Allowable stress (II load): 180Mpa.
Winding calculation: Line frame by bending moment diagram chord distribution, the maximum span moment. Respectively, in the vertical plane and the horizontal plane is calculated. Beam weight allocated by node. Hoists and hoist gantry crane were acting cantilever end and cross, in order to focus. Dynamic load factor of K1 = 1.2, overload factor can take K2 = 1.25 (based on usage to determine whether to take the value). Vertical and horizontal axial force is calculated, and then the synthesis. Horizontal plane by the wind load and the load hoist horizontal force deflection combination.
overhead gantry crane manufacturers feel the level of force deflection hoists from 5 degrees yaw angle. Wind load frame and hanging by a line consisting of heavy windward side. Rated capacity 5 tons when: lifting the windward side is 8 meters. Lifting capacity 10 tons when: lifting the windward side is 10 square meters. Selected maximum axial force, for the calculation of the stability lever. Double angle should be considered in both directions. Allowable slenderness ratio: 120. Allowable stress (II load): 180Mpa.
Gantry installation - horizontal part of the installation:
Lateral part of the installation before the first rod connected and fixed to the arm, check whether the deformation of plywood on the boom, ready to pin and cotter pin (pin joint of each must be plugged with a cotter pin) installed Elam rod.
Transverse section of the pulley lifting process in strict accordance with bridge gantry crane wearing rope wear around use, must be properly and check whether there is in the work rope breakage, with the hoisting rope should widen obey the command, and concentrate on lifting to slow lifting ( Note: The widening rope speed and lifting speed coordinated in order to avoid chaos rope rope quit and cause problems.
4.3.3 Lifting weights is good, then connect the power for debugging, check limiter, safety device, for each hoisting mechanism, slewing parts lubricated, overhead gantry crane gantry body reminds check the verticality ≯ 4% 0, fastening , connecting parts and circuit is in a normal state, identify problems and timely solutions.
Transverse section of the pulley lifting process in strict accordance with bridge gantry crane wearing rope wear around use, must be properly and check whether there is in the work rope breakage, with the hoisting rope should widen obey the command, and concentrate on lifting to slow lifting ( Note: The widening rope speed and lifting speed coordinated in order to avoid chaos rope rope quit and cause problems.
4.3.3 Lifting weights is good, then connect the power for debugging, check limiter, safety device, for each hoisting mechanism, slewing parts lubricated, overhead gantry crane gantry body reminds check the verticality ≯ 4% 0, fastening , connecting parts and circuit is in a normal state, identify problems and timely solutions.
gantry crane installation - vertical part of the installation
The vertical part of the installation:
Standard section lifting: the first section of the installed base on the track. Standard section with a hoist gantry crane , bridge gantry crane lifting a recommendation based on standard section rose to the top surface of the section, turn the erection of boom base section of the alignment, lifting mechanism Matsunawa standard section whereabouts of the top surface of the base section of the connection holes, with high-strength bolts tighten the nuts to connect (all bolted connections to ensure its tightening torque reaches 1300N.m), and installed the same way after the holiday will be a standard four diagonal braces installed, continue lifting the standard section (Note: Use the wrench to turn the adjusting lever erection adjust workpiece position, allowed to use the big hove automatically adjusted).
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