Bridge crane girder

On the main beam camber arch girder bridge crane concept refers to the bridge at both ends of the beam on a plane as a reference , the main beam relative to the plane of the beam end bent upward plane. Max crane girder span bent upward at the center of the main beam , the maximum value on the center of the arch is called the camber of the main beam . Camber on the direction of the main beam length of each part of the camber of the track known as the main beam of the curve, or simply camber line. The sino hoist size and shape of the camber curve crane main beam camber on the manufacture and use of cranes are two important technical conditions . Carrying trolley bridge crane in the main beam is running, if the main beam inelastic deformation , the car is always on a straight track running, which is the best , but in fact this is not possible , because the main beam is an elastomer. If the crane made ​​of the level of the main beam , the crane when under load , the position of the main beam load is bound to produce a downward bent , that hoist gantry crane under the so-called main beam deflection . This time as the car runs across the end of the cross , the car itself will likely slip , running instability phenomenon ; And when the car runs across the end of the span to occur when climbing phenomenon , the running resistance of the car increases easy burning motor . On the other hand , if there is a large main beam under torsion , also worsen driving conditions carts run institutions.

Double girder truss gantry crane

With economic development , it is not only occupies an important position in the national economy , but also in the fields of production and life are also expanding. Weight 160t double girder truss gantry crane gantry steel accounted for more than 60% of the whole weight is an important part of the whole crane engineering system design. Rationality and sino hoist reliability of the safety design of steel structures directly determine the ability to work and quality of work cranes ; while irrational steel design parameters will reduce the utilization of resources. Therefore, the gantry crane steel structure design and analysis has become the focus of the design in the field of research . Aiming at this situation , the use of modern design methods , conduct research on the optimization of a shipbuilding hoist gantry crane design theory 160t double girder truss gantry crane steel structure . Firstly, analysis of the current level of research and development trend of domestic crane , according to the shipyard 's design requirements, 160t double girder truss gantry crane steel structure design depth theoretical study proposes a more advanced design, and in ANSYS modeling, finite element analysis of strength and stiffness .

Electric hoist gantry crane use common problems in the analysis

Electric hoist gantry crane is a kind of more sino hoist crane, the wharf, warehouse and construction sites and other open Spaces has been widely used. Electric hoist gantry crane hoisting device is all kinds of steel wire rope electric hoist, in order to realize the transportation of goods, or to turn the operation, the need to move up and down before and after the hoist gantry crane hook, moving back and forth around the car and mobile crane cart mobile forms such as combination. The work level applicable to the electric hoist gantry crane between A3 and A4, working temperature, about 25 degrees Celsius below zero to 40 degrees Celsius, the outdoor work, large, car and lifting structure must be set to cover. Main component of electric hoist gantry crane work for supporting institutions, electric hoist, steel door frame and electric control system, they are the core part of the electric hoist gantry crane work, also decided to the working performance of the electric hoist gantry crane is the most main factor. Using issues a, electric hoist gantry crane electric hoist gantry crane, a variety of models 10 tons of LDI type electric hoist gantry crane is widely used in railway construction departments, such as the following to the model electric hoist gantry crane as an example, points out problems need to be improved in use, for everybody to discuss. Electric hoist gantry crane beam and the opportunity to connect parts of the main girder

Chain electric hoist

Chain electric hoist made up for the shortcomings of wire rope electric hoist large bulky. Chain electric hoist motor, drive mechanism and the sprocket, and steel wire rope electric hoist's biggest difference change wire rope to the chain. Lifting weight average of 0.5 ~ 60 tons, lifting height is 3 ~ 120 meters. Chain electric hoist, keep hand chain hoist and convenient features, and improve the hand chain hoist steel crane operation, slow speed and so on, gathered his hand chain hoist and electric hoist, the advantages of using disc brake motor as power cycloid pin gear reducer reducer, chain electric hoist compact structure, small volume, light weight, high efficiency, easy operation, reliable braking, the characteristics of simple maintenance. Chain electric are mainly domestic platinum (Vanbon), TXK, ELK, WKTO, imported Japanese like CARDS, toyo, Japanese ghost number one, and sino hoist, animal husbandry, grace and so on Europe and the United States electric hoist and other several use is more, quality is good brand. Chain electric hoist capacity: 240 kg, 300 kg, 0.5 t, 1 t and 2 t, 3 t, 5 t, 10 t, t, 20 t, 30 t, 35 t, 50 t, t, 60 Shanghai wan platinum crane (Vanbon) have been able to achieve the maximum tonnage of 100 tons. Chain electric hoist chain electric hoist speed: double speed, single speed, frequency conversion start, double speed variable frequency start, domestic at present technology has been able to achieve a double speed variable frequency electric hoist manufacturing requirements. Chain electric hoist brake: pound of magnetic brake, conical rotor braking brakes, double brake (pounds magnetic brake + mechanical brake) chain electric hoist according to lifting methods are divided into: crane, crane lifting stage special upside down. Chain electric hoist characteristic: the performance of advanced structure, small volume, light weight, reliable performance, convenient operation, chain electric hoist applicability is wide and the lifting heavy objects, loading and unloading, maintenance equipment, lifting the goods is very convenient and chain electric hoist can be mounted to the impending h-beam, curve track, slewing crane rails and fixed hoisting hanging heavy objects. Chain electric hoist access power 110 v to 690 v (domestic current can reach), the standard generally is 380 v, 50 hz. Chain electric hoist control switch voltage is 36 v / 24 v (control switch if without built-in transformer into 36 v safety voltage will cause harm to the person so most of the link chain electric hoist control voltage is 24/36 v). Chain electric hoist standard configuration must contain a limit switch phase and phase sequence protector.

Hoist bridge crane

Gourd refers to electric hoist bridge crane for lifting mechanism of bridge crane, mainly for small tonnage (less than 10 t) and use frequency sino hoist lifting work sites. Because of its convenient operation and maintenance, lightweight flexible, price is low, so in the light industry, chemical industry, machinery and other industries are widely used in lifting operation. This kind of crane is the ground operation more, generally a professional life is the number, or do not need specialized personnel operation, so the scene, there are many unsafe hidden trouble easily. Of course, not only the hoist bridge crane prone to hidden trouble, some hoist gantry crane types of crane is the existence of insecurity. Lifting equipment common accident features: accident consequences; Accidents have frequent sex, concentration and sudden; The accident types associated with the kinds of hoisting equipment; Accident injury crisis of range and concentration. Caused the main reason of the accident has the following several aspects: mechanical operation personnel in operation and maintenance of the violations; The negative impact of the mechanical work environment in there are obstacles on the run, for example, in the job site along with high; Mechanical equipment itself safety performance is not good. It might be against standard design, manufacture or installation problems left by the bad; Natural phenomena occur suddenly. Such as earthquakes, floods, etc.

Simulate the crane work

With traditional two-dimensional CAD design of crane time cycle is long, repeated design, product innovation is insufficient, the engineer's design experience is not very good inheritance, makes the design efficiency of series of products is not ideal. Bridge crane is designed to experience of design, development, evaluation, manufacturing cycle repeatedly, the process time is long, and the design cost is high, the efficiency is low, the risk is big. And the sino hoist of modular design, through the component level, generalization and standardization can simplify the product structure, make the product diversification. At the same time using the parameterized design of gantry crane and 3 d parametric modeling technology, can reduce repeated labor and improve the design efficiency, make products to satisfy user needs. At the same time using an interactive simulation technology, the bridge crane driver's operating system can be virtual simulation, set up the corresponding effects, truly simulate the crane work and working conditions, to predict the potential risks in the working process of the bridge crane, and can improve the work efficiency of bridge crane.hoist gantry crane as interactive simulation tool, has great advantages in terms of interactive simulation. Through the, can realize the keyboard to control the 3 d model and the man-machine interaction effect because of the bridge crane bridge block design.

Loader job working device should be able to guarantee

Loader job working device should be able to guarantee: when turning cylinder are blocking,sino hoist arm oil cylinder lifting or landing, up and down link mechanism make the bucket translation or close to translation, to avoid tilt bucket and scattered material; When the movable arm in any location, bucket spinning the movable arm hinge point hoist gantry crane during discharging, bucket Angle is not less than

45 °, movable arm fall after unloading and can make the bucket flat automatically.

Cantilever crane

Cantilever crane steel crane main use of boom keep out appearance around the vertical axis of rotation (pitch) cooperate with lifting goods, using flexible action, meet the requirement of loading and unloading, and its form has fixed, mobile and floating. Cantilever crane sino hoist crane main use of boom keep out appearance around the vertical axis of rotation (pitch) cooperate with lifting goods, using flexible action, meet the requirement of loading and unloading, and its form has fixed, mobile and floating.

Wharf cranes crane equipment such as the lack of development

Although in recent years the construction, port construction implementation, wharf cranes and other  sino hoist  equipment have been relatively rapid development. But in the rapid development, we still need to know that we exist some shortcomings, after all, only the presence of such awareness, enterprises or individuals, what we need to know. Understand their own disadvantages and advantages to be able to truly realize their own progress and development.
1, the domestic equipment manufacturing enterprises crane overall design of the low level, especially in innovative design ability, mostly stay in the imitation stage, the product level is difficult to improve.
2, the market most of the small scale enterprises hanged machine, subject to market constraints, some companies generally do not have to take it as a major product development, manufacturing processes and equipment generally lag behind.
3, from the point of view of product marketing in recent years, a lot of product quality, but off, poor reliability, resulting in high failure rate, hoist gantry crane  safety has become a topic of concern to society in general.
4, cab and interior design has long been a weak link in crane design, supporting industries lack of capacity also affects the overall level of product improvement.
5, product specifications less, generally only 1 to 2 business sizes, it is difficult to meet the needs of various users at home and abroad. In addition, the product update cycle is long, some enterprises for product upgrading is not enough emphasis.
6, technical services are not in place, the level is not high, the lack of an effective technology to track products. In products and services, domestic enterprises and foreign crane larger than the gap, but also improve the comprehensive service system.
7, as in recent years, rising raw material prices, the manufacturing cost is high.
     In the face of these developments lack of  steel crane  equipment, crane manufacturing enterprises should integrate research efforts for technological breakthroughs, improved product mix; facilitate planning of production, reducing costs; while enhancing quality of products and services, I believe so, China's crane equipment development will be more rapid, open foreign markets to occupy foreign markets just round the corner.

Construction machinery industry has ended the high growth momentum

From 2011 the first seven months of construction machinery of the situation , the industry has ended the high growth momentum.
Although the growth rate of output ,sino hoist the construction machinery industry is still in the machinery manufacturing industry to maintain a high level, but with the rapid growth of the industry compared to 2010 , the growth rate has been greatly reduced. Meanwhile , construction machinery sales of several major products has grown from growth to decline in the rate of decline of individual products is still quite large.
Production and sales from April to enter the inflection point
From 2011 the monthly output of construction machinery industry point of view, in April this year reached a peak . According to the China Machinery Industry Federation data , from January to June of construction machinery industry output value of the month was 41.922 billion yuan , 36.428 billion yuan , 59.227 billion yuan , 64.873 billion yuan ,steel crane 57.398 billion yuan , 52.717 billion yuan . From this set of data, you can clearly see that from the beginning of April , the monthly output of the construction machinery industry began monthly decline , MoM decline were 11% and 8% .
From the China Construction Machinery Industry Association statistics, also reflects the same trend. However , the entire decline in a month ahead of time , from March began. China Construction Machinery Industry Association, key enterprises Group 2011 3 to 6 months of operating income was 49.2 billion yuan , 46.1 billion yuan , 37.2 billion yuan , 31.6 billion yuan . Operating income showed monthly decline, the decline MoM were 6 %, 19 %, 15% .
In addition, from the main product sales point of view, the first three months of this year , also increased month by month , but from the beginning of April , sales began to turn down , and showed a downward trend month by month . According to the China Construction Machinery Industry Association, 24 key enterprises of the industry statistics , the 2011 excavators , loaders , cranes three kinds of main products in June with March sales comparison can be found with only three months , three large variety of both sales decline of 50 % or more. Especially excavators, the decrease is as high as 77%. March sales of 39,989 units loaders , June to 19,240 units , a decrease of 51% ; March 6860 truck crane sales units, in June of 2718 units , a decrease of 60%. March excavator sales of 43,299 units in June of 9961 units , a decrease of 77%.
April entire construction machinery industry in 30 % of the decline in output , sales have declined substantially ,hoist gantry crane when it caused widespread concern in the industry , the industry concerned thus put forward the " inflection point ," said. Recalling the situation in the industry this year , April has indeed become the high point of the entire industry , even though the "turning point , said " It is not widely recognized , but the situation now , in April this high point has become increasingly clear , and very there may be maintained until the year.

Tower crane rental market boom tower crane industry successfully saved

As the world's largest producer of the tower crane , tower crane , not only in our country has achieved good sales results,steel crane the tower crane rental market has been the development and prosperity . Especially in the last year of construction machinery industry downturn , the loan market has not been affected , the gradual recovery of the industry in the current context , our tower crane rental market is extremely strong .
Statistics show that as early as 2002, China is the world's first tower crane annual production exceeded 1 million units Country, to become the world 's largest producer of the tower crane . At present , China's output of enterprises tower crane construction not only meet the domestic demand , but also are exported to Europe, America and other developed countries and regions. As of the end of September 2011 ,hoist gantry crane total exports of tower cranes 1703 , with a total amount of $ 240 million .
Tower crane industry benefited from the development of successive adjustments of domestic economic growth, and this context large infrastructure continue to be launched , including rail transportation, building construction, energy and water conservation , and so many aspects of engineering . And this year, the country 's urbanization gradually expand and accelerate the development , the development of the tower crane gave another massive new blue ocean. Can be said that China tower crane market prospects, are long-term bullish .
It is particularly worth mentioning is that , even in the last year, China's construction machinery industry is facing negative growth , the tower crane market has managed to avoid this fate. This is mainly because of the tower crane market structure of the credit , because the price is usually higher , largely hindered ability to buy small needs, these needs have been met through leasing instead , making China tower crane market is actually made purchase and lease of two parts , but the proportion is much higher than other leasing of construction machinery products. In the slow economic recovery , funds are tight circumstances, buy tower crane market is further transformed into the rental market , so the overall market in terms of the impact on the tower crane is not large , which is the tower crane market in the context of shrinking industry in general under the unique cause.
Our tower crane rental market has been able to successfully save the tower crane industry , the main interest in the leasing industry sound system , because the tower crane tower crane rental not stop at the level of leasing , and ranging from  sino hoist  leasing , installation, use, maintenance , etc. provide high quality services in all aspects . Recommendations tower crane rental companies to increase production and hire market attention , to further improve the existing rental service industry chain , the maximum to meet customer needs, in a competitive market slice.

When transporting girder beam carrier safety inspections

With the adjustment of national policies, accelerate infrastructure construction, the construction of the railway bridge,sino hoist the rapid increase in the number of highway bridges, girder vehicle in such construction projects increasing demand, then beam carrier girder need to pay attention to what security checks it, because girder car body is relatively large, the way must be cautious in the girder, a small mistake can cause the body might capsize, personnel casualties. In order to effectively prevent accidents, accident prone areas for strict checks:
     First check whether the beam carrier qualification units issued Zhunyongzheng; job site where a safety hazard identification, full-time staff monitoring; checking the status of the road surface must be dry and free of oil, flat cement, asphalt and compaction hoist gantry crane graded pavement.
     Followed by transporting girder vehicle checks before commissioning, such as: emergency switch is working properly, the tire pressure up to standard, wire rope is not damaged; trial run of the indicator, device, system working properly; mounted on the beam, the beam position accurately fitted, working pressure within the normal range.
     Finally, with the bridge machine with the process, transporting girder vehicle parking position and the distance to the  overhead bridge crane  within the limits prescribed, girder trolley car girder erecting machine the day before yesterday with the car speed synchronization.

To the rational development of tower cranes

Nevertheless, since the tower hoist gantry crane  and construction industry and economic development are closely related, the tower crane industry for quite a long period of time is still the market. Therefore, our tower crane industry wants rational development, first 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.

Long-term, our tower crane market is still inseparable from the orderly development of policy guidance and support.sino hoist Relevant departments should play a guiding role in science, focused on solving the tower 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,overhead bridge crane it may be a crisis, after all, can not make good policy to become the tower crane market a "narcotic."

Heavy cranes in the chemical industry market prospects

As oil prices rose faster than on the demand for petrochemical products in the recovery phase velocity,hoist gantry crane the petrochemical industry, companies have to please the leasing company, trying to be more cost-effective services.
Asia-Pacific region during the financial crisis of affordability in 2010 OPEC developing strategic documents long since been described as refiners' ability to grow the core "of its fast recovery of the global petrochemical industry plays an important role.
In the past 20 years, the region has achieved self-sufficiency in turn develop national export of petrochemical products, although able to export petrochemical products decreased number of countries, but the proportion of petrochemical production capacity has increased in developed countries .
The establishment of the new plant and the old plant expansion is carried out up to this pace, resulting in Western Europe, Japan and the United States in 1980, when they accounted for 80 percent of the global petrochemical market countries, to 2010 in the world market share of total reached only 37%.
OPEC said the mature markets of Western Europe and the United States generally lower utilization, interim profits.steel crane As these areas the demand for petrochemical products slow recovery, so not many new projects underway.
However, in another mature markets such as the Middle East, other markets fall in consumption does not affect the good performance here. In Saudi Arabia, petrochemical products export growth of 83%, in June 2011 reached $ 1.39 billion.
Middle East countries to vote heavily in the expansion of existing production capacity after the leasing company responded quickly together toward the rapid development of the promising market. A series of expansion projects in the region behind, ALE will relocate its heavy lifting sector UAE, want to take advantage of this opportunity in the next five years to obtain greater benefits.
These projects include ALE Habshan V gas processing plant and plans 2016 Ruwais refinery expansion project completed in Phase II.
ALE Heavy  sino hoist,  director Paul Sands said that even if the existing equipment with Saudi Al Suwaidi transportation company providing services in terms of size, enough to see the market potential of the region, it was decided to move the company headquarters here.

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.

Cranes equipped with safety devices which

To ensure safe and reliable lifting operations,  bridge gantry crane  equipped with a better safety devices in order to unexpected circumstances, play a protective parts or alert the operator, and thus play a security role.
  A hydraulic system, the pressure relief valve: inhibit loop abnormally high pressure in order to prevent damage to the hydraulic pumps and motors, and to prevent is overloaded.
  2 luffing jib safety device: When the unexpected accident, boom luffing cylinder loop pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from work oil, the boom will not fall, thereby ensuring the safety of operation.
  3 telescopic crane safety device: When unexpected accidents, telescopic boom cylinder circuit of the high-pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from the working oil, the suspension will retract themselves,hoist gantry crane thus ensuring the safety of operation.
  4 height limit device: hook up the required height to rise after touching limit hammer, turn the trip switch, "over round" indicator light that is bright, while cutting off the hook lifting, boom stretched out, hanging Arm volts to the operation of such action to ensure safety. Then just manipulate the hook down, boom boom retracted or looked up (to the Security side operation), etc. handle, lift the weight limit constraint, the operation returns to normal. For special occasions, such as still need to make a small amount of over-winding operation, press the release button on the meter box, this time limit will be lifted role, but this time the operation must be very careful to prevent accidents.
  5 leg locking device: When unexpected accident occurred, leading to the leg vertical cylinder hoses or tubing rupture or cutting, the hydraulic system can be disabled with a two-way hydraulic lock cylinder two leg blocking pressure oil chamber, the branch Notations or throw the legs, thereby ensuring the safety of the lifting operation.
  6 from the weight indicator: Starting weight indicator is set in the basic arm together side (ie, the right side of the cab), the operator sitting in the control room can be clearly observed, can accurately indicate the boom elevation and the corresponding conditions allow cranes rated capacity.
  7 Lifting Characteristics Table:sino hoist Set in the control room on the front side of the lower wall, the table lists the various arm lengths and a variety of work rate and the nominal weight lifting height for operation inspection. Lifting operation, must not exceed the values ​​specified in the table.

Crane industry related specifications

In order to eliminate hidden dangers, construction quality and safety supervision station specifically for city construction  overhead bridge crane  operations management developed ten "red line", builders beyond any one of them, will face severe punishment, in serious cases, they will be hung booked even withheld safety production license.
It is reported that the supervisory authority will take the spot test method, the inspection found that the construction  sino hoist  management responsibilities are not implemented, there are security risks units and persons responsible for strict accountability, as appropriate, to give warning, hanging yellow card, remember bad behavior, withheld safety production license (or into fertilizer record card) and other penalties. Meanwhile, the city construction quality supervision station developed a "construction crane Ten Management 'red line'", focusing on the legal formalities to fulfill equipment operator certificates, safety limit safety device intact, implement regular inspection and maintenance as made it clear that.

    Please  steel crane  industry related personnel comply with relevant regulations!

Bridge crane normal operation, gnawing rail hazards

Crane normal operation, the wheel rim and the orbit must maintain a certain gap between the design maximum gap of 30-40mm, but in exceptional circumstances, the wheel is not in the middle of running its tread,hoist gantry crane rim and squeezing each side of the track friction gnawing rail failure occurred, affecting the safe operation of the crane.
First, the dangers of eating track
1. Reducing the service life of the wheel and rail. Intermediate bridge crane in the type of work under normal use, the wheels can be used for 10 years or longer, but the gnawing serious rail bridge crane, wheel life difficult than one year, or even only a few months, resulting in frequent replacement wheels. Side of the track rail friction also reduces the service life, serious, track access is only 3-5 years scrapped.

2. Increase the running resistance. According to the determination, serious gnawing rail bridge gantry crane  running resistance is the resistance of 1.5-3.5 times normal operation, causing the motor and drive mechanism to increase the load even overloaded, the motor can be severe burning or transmission failure. Bridge crane with the risk of derailment. Overhead crane rails serious bite, the wheel rim is compressional deformation, may climb the top of the track causing derailment.

3. Negative impact on the building structure. Easy to produce horizontal rail crane gnawing lateral force, causing lateral displacement of the track, the track bolts loose. In addition,sino hoist the lateral force transmitted to the plant through the roof rail, seriously affecting the bridge and plant stress conditions so trusses Itabashi partial loosening or breakage.

Overhead crane load sway reasons

When using material handling  sino hoist  when the crane carts, trolleys and lifting mechanism motion by the respective operating instructions are usually controlled independently; when handling the material reaches the target position, due to the carts and trolley deceleration effects load swing phenomenon appears objectionable; when the load swing, the unloading operation can not be performed.
     The above situation, only skilled operatives is possible by controlling the size of the car running to eliminate rocking. However, this requires highly skilled operatives operating skills and a high degree of concentration. Elimination of the load to adjust the load swing and microscopic target position takes a long operation time, which accounts for the handling about one third of the time required.
     In addition, the  overhead bridge crane  load quickly run will cause much of a swing. Excessive load swing on-site operations pose a threat to personal safety. Also increases the load and the load swing around the possibility of damage to the goods being. Swinging has become a crane load limit movement of materials to improve the efficiency of a major factor.
 
Crane brake inspection

     Brakes are important parts of the crane, the agencies directly affect the accuracy and reliability of the movement. Therefore, we must carefully check the hoist and luffing two institutions brake condition, observe the opening of the brake shoe friction elements and the wear of the brake pads. Band brake brake band to pay attention to check for cracks in steel backing, whether flexible transmission brake,hoist gantry crane brake frame is intact and the main spring and the auxiliary spring elastic compliance.

     Bridge crane track to determine: the dimensions of the goods to be able to pass the legs flat steel frame. Along the mast to meet stability requirements crane track direction. Note that track B and span S proportional relationship, and generally track B = (1/4-1/6) S.

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.