Electric hoist single-girder gantry crane maintenance platform modification

Current situation analysis of electric hoist single-girder gantry crane is widely used in outdoor environment loading and unloading of goods. For L type electric hoist single-girder gantry Manual hoist, every time when overhauling electric hoist is one of the maintenance, to ensure the normal maintenance of electric hoist, often used when manufacturing method based on a crane gate leg erection overhaul platform, platform construction can be divided into two categories: fixed and discharge type. For fixed maintenance platform, in order to guarantee the safe operation of electric hoist Manual block process, platform edge must keep a safe distance with the electric hoist (usually not less than 5 0 0 mm), the existence of the original table arrangement distance, make the electric hoist maintenance disassembly is very difficult, to be the body stretched out when the repairman in maintenance platform, sometimes need lift car even escalator to complete the maintenance task. Hold dump maintenance platform is set up when needed to repair, can solve the stationary platform caused by the platform and electric hoist distance too far.

The role of lever hoist

Lever hoist is safe and reliable, durable; Good manual hoist, convenient maintenance; Small volume, light weight, easy to carry; Small hand force, high efficiency; Progress predecessors structure, beautiful appearance, etc. With regulation model, specification of the wire rope hoist firmly down. Wire rope hand gourd, general for metal material synthesis, so in terms of maintenance must be done comprehensively, so that can not hoist equipment the equipment normal use. Usually with brake squirrel-cage conical rotor motor with electromagnetic brake (or another cylindrical rotor motor) drive, the weight average of 0.1 ~ 80 tons, lifting height is 3 ~ 30 meters. Electric hoist except can be used alone, but also with the manual, chain or electric car together, hanging on the roof of the building or crane beam is used.

Automatic shift function of hand since the transmission

In recent years, which has the function of automatic shift hand - the one transmission (AMT), the domestic heavy commercial vehicle manual hoist boom, developing rapidly, the loading rate is rising. By drivers, however, the use of arm for gear transform mechanical manual transmission (MT), despite the challenges, but as a result of product performance has a comparative advantage is very outstanding, therefore, under the current national conditions, is chainb lock a heavy commercial vehicles of the most widely used variable speed device. In the field of heavy MT gearbox, the loading rate is the highest gear more modular MT transmission. From the point of product technical characteristics, modular MT gearbox, generally there are two kinds, one kind is times file (sectional match) combined, the other is a half (plug-in match) combined. 1.1 times the combined in terms of the structure of products, times file combined MT gearbox, is back in the main transmission series to install a second vice transmission (high and low), the main transmission gear by the increase in the number 1 times. Gear transmission ratio increased by numerical value is equal to the product of the main transmission gear ratio and auxiliary transmission ratio, number of logarithmic is less than the gear and gear. Therefore, the size of the gearbox casing is shortened, it shorten the length of the shaft, but stiffness increased, thus increasing the transmission capacity.

Mechanical efficiency calculation problem

Mechanical efficiency computation chainb lock is an examination questions type, as long as the students grasp the mechanical efficiency calculation problem of the problem solving skills, accurately identified which force to do the work is useful work, which total energy is doing the work force, will be able to correct the problem solving fast. In this paper, through the analysis of the general topic, for example, and the mechanical efficiency, and the students to manual hoist and summary mechanical efficiency calculation problem of the problem solving skills. A using block and tackle, the vertical case 1 in small construction site, simple lifting equipment commonly used vertical lifting construction materials, its working principle of pulley block as shown in figure 1. One will be the total weight is 4000 G n bricks uniform to 10 m high above, takes 40 s, hoist provide pulling force F 2500 n. : (1) the useful work in the process; (2) the work and power of the force F; Analysis (3) the mechanical efficiency of pulley block. (1) work is equal to the size of the forces acting on the object and the object in the direction of the force on through distance by figure 1. The figure 1 shows that useful work is the effect on the objects of the work done. As shown in figure 2, because the object in the vertical direction to do uniform motion in a straight line, so F = G, namely there W = F, h = Gh. (2) due to mechanical tension is through the direct effect on the rope of the free end, so the work force F do is work all the time. So the power of pull force F can be used.

Chain lever hoist is widely used

HSH lever hoist ring chain is widely used in electric power, mining, shipbuilding, construction, transportation, post and telecommunications chainb lock such as equipment installation, lifting, part drawing, bulk, bundling, line taut and welding counterpoint, lever hoist especially in narrow workplace, field aerial work and different Angle of pull more show its manual hoist. Light chain lever hoist is a kind of small, multi-purpose manual lifting, traction machine, widely used in electric power, mining, shipbuilding, construction, transportation, post and telecommunications departments such as equipment installation, lifting, part drawing, bulk, bundling, line taut and welding counterpoint, lever hoist especially in narrow workplace, field aerial work and different Angle of pull more show its superiority. HSH - DC lever hoist subminiature, ultra-low weight, easy to carry, high operating easily, ka ca can firmly fasten. A subminiature because of its structure, light weight, etc. In the place where high operation and small operation. Light goods fastening, fixed object, calibration position. On various occasions. It can be upgraded, traction, drop, calibration etc. If a particular device, not only can be used as a non linear drawing operation, and can be very convenient to choose the appropriate operating position, or in small tonnage machinery exponentially expand its load capacity, a number of machines can be used for large tonnage load in parallel.

Condition of large hoisting equipment

Condition of large hoisting equipment, marks a national engineering machinery manufacturing ability, determine the traffic construction speed and quality. Our country really started to manufacture large chainb lock machinery lifting equipment in the 70 s, after nearly 30 years of arduous exploration, has made great development. Large hoisting equipment level of design capability, manufacturing, lifting load and the intrinsic quality, mechanical properties and the contents of science and technology, continuously leapfrog development. At present, is moving toward product seriation, variety diversification, simple operation, intelligent operation and performance of modern direction. $$in recent years, our country developed manual hoist developed large hoisting equipment, and identified by authority department has been close to or reached the current international advanced level. And initially formed the development of generation, research generation, reserve generation of production pattern. Based $$$$from scratch to lay looking back the development course we may see that the first 20 years since the founding of new China, our country because do not have the ability to create large lifting equipment, lead to transportation and engineering infrastructure used imports all large lifting equipment. $$in the next few years, our country successfully developed the 38 meters high, weight of 140 tons, the hoisting with 10 tons of port portal crane M10-25 type. Used for lifting heavy weights, traction weight and tensioning of the SuoSheng, suitable for places no power supply and liquidity operations.

The role of the chain

Temporary anchor chain chain chart (people used to think that chain can only be used as a lifting and bundled goods, actually the role of the chain is far more than these, with the following two examples, chain blocks can be found more use. Use a: instead of sinking cart river don't call chuan chuan si row of demodex led states with lead in sichuan words ︸ factory in jiaozuo hoist equipment han shan mine shaft wind well temporary change in the process of the ground, because the ground sinking car enough, two cage rope no steady vehicles. They through the ground a temporary car, two stable rope hanging to the headgear pulley platforms, stabilizing the ground end of the rope rope head, two by two 5 t fixed on ground hit temporary anchor chain, need rope tension, adjust by hand chain hoist, this solution both production in need, and save a large amount of manpower and material resources, as shown in the attached figure shown in (a); (note here, steady rope tension adjustment, the small chain chain should be on the main chain). Use 2: eliminate the manual hoist cable head rotating force in the city always Chen hang 24 t skip process four mine shaft

In order to ensure the vulnerability including perfecting hoisting machinery parts and metal structure of security technology, lifting machinery safety device, lifting machinery safety procedures. Metallurgical industry with the crane has the characteristics of different, its safety technical measures are also different. Improve the crane safety technical parts, main parts, have the hook, rope and pulley and drum, brake, gear reducer and gear coupling, wheels, etc. Hook according to the structure is divided into forging hook and chip.

Choose steel materials manufacturing

Choose steel materials manufacturing, chain chainb lock, the main part of the chain with 800 mpa high strength lifting chain, material generally is 20 m2, medium frequency quenching heat treatment, low wear and corrosion resistance of the chain; High strength hook, general for alloy steel material, calcined play type design ensures that the slow lifting hook to manual hoist overload; Comply with the European CE safety standards.

Chain by pulling to move the chain

Chain by pulling to move the chain, manual hoist wheel rotation, the friction slice ratchet wheel, brake pressure into one common rotation, short and long axis rotation piece of gear, the tooth axis and the spline gear. So perfectly on the spline gear lifting chain wheel drives the lifting chain, thus hoist equipment promote weight. Unilateral brake friction ratchet type, can self braking under load, ratchet in spring and ratchet gearing, under the action of the brake safety work.

lifting and other materials such as wood handling operation.

Change of different auxiliary work unit can also be bulldozing, lifting and other materials such as manual hoist handling operation. In roads, especially in the construction of high-grade highway, the loader used in subgrade engineering fill dig, asphalt mixture of aggregate and cement concrete chainb lock and loading operations. And also can be a force behind the soil, ground leveling and other machinery operation traction.

Traction weights of small light lifting equipment

Also called the fairy gourd, jin does not fall, manual gourd, is a kind of simple to use, easy to carry the manual manual hoist machinery, also known as chain hoist or chain. It is suitable for small short lifting equipment and goods, the weight is generally not more than 100 t. Shell material is high quality alloy steel chain, strong wear resistance, high safety performance. Manual gourd - hoist equipment gourd refers to using human drive chain and the handle to ascend or traction weight small light lifting equipment. Can be divided into the ring chain and lever blocks, steel wire rope type two kinds.

Chain hoists main parts scrapped conditions

manual hoist accessories including hooks, wall panels, sprockets, flower keying gears, so siding, sheets and other gear, chain hoists to introduce you to the following main parts scrapped conditions, such as in case of retirement should be replaced.

    1) Lifting chain
A, chain wear ring diameter than the nominal size of 10%;
B, two links from the elongation of more than 3%,wire rope winch a single link from the elongation of more than 5%;
C, cracks or other harmful defects;
2) Gear
A, tooth thickness wear more than 10% of nominal size;
B, crack;
C, broken teeth;
3) friction plate wear more than 25% of the nominal size;
4) increased wear of the chain groove size, more than 10% of nominal size;
5) between the shaft and the bearing clearance is too large,chain block more than 15% of nominal size;
6) ratchet pawl and spring severe wear or corrosion;

Bronze proof chain hoists instructions

1, the operation must be scrutinized before proof  chain Block  individual components and parts, including each link of the chain, in good time before use. In equipment shaft, gear daub amount of grease to reduce wear and improve extended equipment life.
2, are not allowed to use overload proof chain hoists.
     3, lifting chain requires vertical hanging weights. Chain link between individual shall have the wrong button.
4 Pull the zipper, the zipper direction must be in the same plane with the chain sprocket.
5, is strictly prohibited stayed  manual hoist s to prevent card chain.
6, pulling force must be smooth to avoid jumping chain or card chain. When they find driving difficulties, should promptly check the reason, not deadlift, but not allowed to add people afterburner, so pull off a chain or pin.
7, use a tripod, the tripod must maintain relative spacing, feet between applications rope ties a rope on the ground when the contact time, pay attention to prevent workers tripping.
8, lifting height shall not exceed the standard value,hoist equipment to prevent the chain pull off the pin, causing the accident.
9, lifting personnel are forbidden to do any work under heavy loads and walk around to avoid accidents resulting in personal injury.

Electric hoist crane group conditions of use

Electric  rope hoist  crane group conditions of use
Conditions of use not only affects the group hanging electric hoist use and work efficiency, but also the life of the equipment has a great impact on the future, the following  for your group hanging electric hoist conditions of use.
     Electric hoist in what context the work efficiently for you to do the following brief introduction. If you do not pay attention to these factors the premise of their work, their work efficiency will be discounts. Many people use electric hoist, it may be the most easily overlooked premise of this factor in the working environment, but in fact the environment will affect their work.
Ambient temperature: -20 ℃ ~ +40 ℃
Work rail system: Intermediate JC25%
Weight class: JC40% when the intermediate rail system working group hanging electric  lever hoist  30% weight reduction, namely heavy duty rail system JC40% of electric hoist. Heavy duty rail system JC40% of electric hoist is used in relatively heavy work load often requires a higher safety factor rating or the case.
Electric hoist structure reducer: A three fixed idea helical gear roll structure, gears and gear shaft via a heat-treated alloy steel, box, cover made ​​from high quality cast iron, fitted tightly sealed. Reducer self-contained unit, handling is extremely convenient.
Control Box: The intercept in case of emergency the main circuit, and with vertical stroke limiter off the fire protection devices. Ensure the safe operation of the electric manual hoist. Electrical components, long life, reliable operation.

Electric wire rope hoist single multi reel

Electric wire rope  lever hoist  drum major play in lifting mechanism hoisting or hauling bodies and winding rope.
Electric hoist wire rope electric hoist drum where the number of layers can make single or multi-layered. Normally they use a single hoist drum. Single hoist drum surface is usually cut helical grooves, a rope wound in the groove, the contact area between the rope and the drum increases, the pressure reducing unit, and to prevent friction between adjacent wire, extending the life of the rope .
Spiral groove is divided into two kinds of shallow grooves and deep grooves, generally use more standard slots, only when there is the use of rope brackets dangerous only when using trench hoist drum. Single drum hoist pulley block with single spiral groove; twin pulley reel double spiral grooves symmetrically distributed.
Multilayer winding drum  manual hoist  for lifting height is large, while the electric hoist roll length and limited circumstances, such as cranes, electric hoist drum winding layers generally made smooth, and its inner rope by the outer layer extrusion wire in the winding process the friction between adjacent loops, reduce the life of the rope. Moreover, constant tension on the rope, the rope on the drum with the load torque varies layers, resulting in instability of the load torque. To improve the hoist wire rope on the drum in the released state, to improve the life of the rope,hoist equipment and there is also a spiral groove around the hoist multi-roll.

Electric wire rope hoist coupling material selection

Coupling of different materials  rope hoist  carrying capacity are very different, usually electric hoist gear couplings carrying capacity than other couplings, metal flexible couplings original carrying capacity than the original non-metallic elastic rope hoist couplings,manual block the following details for you.
Mainly to transfer power coupling and transmission wire rope hoist or hoist control movement-based coupling is obviously different. In focusing conditions, should not choose hoist drive couplings, will increase the electric hoist coupling size and weight. Short time overload,load chain the best selection of safety couplings to reduce size. Under variable loads of drive shafts, when the load change is large, you should choose a good cushioning and shock absorption coupling elastic wire rope hoist.
Rigid coupling specially made easy, light weight, low cost, but two of the neutral axis demanding, flange couplings,manual hoist packers couplings, wire rope electric hoist lifting flange couplings most widely used.

Explosion-proof electric hoist electric idea how to deal with

Explosion-proof electric hoist applications rather special, in general, relatively high demand for proof. Explosion-proof electric  lift hoist  proof grade is divided into three and four explosion, the explosion of different products corresponding to different environments.
All electrical components electric motor are mounted in explosion-proof enclosure. Including explosion-proof enclosure consisting of several parts, end caps, bearing cover, shaft, terminal box and cover, terminals, terminal screws, seals, screw terminal sets, compression nut, etc., explosion-proof enclosure fastening bolts connecting the number of non-missing, each bolt with spring washers to prevent self-loosening,wire rope winch otherwise they will lose proof function.
Introduction of cable diameter electric motor with terminal box match the diameter of the inlet ring, good line, pressed by the compression nut seals the cable diameter and the inner ring and the seal between the outer diameter and junction box no gap between the seat bore so as to achieve proof function, brake inlet ring diameter Φ6.
Explosion proof enclosure between the mating surfaces of the joint surface, such as the base and cover of the Mouth of the mating surfaces, axis and the axis of the inner cover mating surface,manual hoist terminal screw threaded sleeve with the mating surfaces, etc., can not be bump-proof combination of surface and rust.

Chain hoists performance mutations cause decreased security

Chain hoists because of their small size and other simple maintenance and other advantages, the use of more extensive range of original, and because mutations chain hoists performance,lever hoist security incidents are growing decline, leading to the emergence of failures in addition to the device itself quality problems, the there are many objective reasons such as improper use of the following detailed analysis of your performance chain hoists mutations security reasons for the decline, for your reference:

1, chain hoists lifting weights over from the weight of the provisions;
2, chain hoists or oblique horizontal pull, pull too high or too low;
3, on the use of chain hoists lifting chain bend or kink is still used;
4, tossing hoists;
5, chain hoists main force component corrosion, cracks, lack of strength or significant plastic deformation;
6, rope or tie optional low base connection method is not correct, then do not tie securely;
Mutation  manual hoist  performance, safety performance reasons for the decline of the two
An opponent pull hoist performance principles, institutions are not familiar with easily removable;
2, install chain hoist brake, the installation is not reliable;
3, have not been unloaded after maintenance, overloading test that is put into use;
4, long chain hoists work load; work environment is complex, rubs increase the weight;
5, the use of chain hoists can not concentrate, resulting card chain, tripping, kink;
6, the use of the rear end routine maintenance, improper storage.
When you use a  chain Block  to remind eye rigorous inspection equipment for problems, operators work should concentrate, to observe, rational operation, after use to be more equipment to do proper maintenance to maintain a permanent chain hoists performance.

Using the remote control electric hoist Precautions

Electric  rope hoist  remote control operation is to achieve the major components used directly manipulated by the operator, here to introduce you to the use of electric hoist remote control when you pay attention to what matters?

1, you can not hoist cables hanging keys or other items strong pull.
2, once the remote control button insensitive action,hoist and trolley please stop using it.
3, in order to adjust the cable length keys, do not wound bundle.
4, the operating and release the key switch electric hoist, do not throw, hit to avoid the physical equipment and other operating personnel.
Finally reminded users who encounter a sudden power outages and other power outages, voltage maintenance circuit will start working. In this case, after power is restored, even if the operation of the remote control button switches, electric  manual hoist  does not work. At this point need to press the emergency stop button to stop the reset state to lift the suspension, electric hoist to work.

How to prevent overloading using chain hoists

Chain hoist overload use is more common, failures due to overloading is also more common,manual block the following shows you how to prevent overloading chain hoists, to avoid similar accidents.
Prevent overloading chain hoists can be used on the device plus overload limit device, this time, add the gourd is also called overload device against overload chain hoists. Overload prevention chain hoists main purpose is safe to use. If you pull the weight exceeds the rated load requirements chain hoists, chain hoists will be at work is stalled, not a security risk, it would not do any harm to the device.
Anti-overload  manual hoist  operation is also very simple, if already in the anti-overloading heavy chain hoist load range, this time to pull the hand chain hoists are not working, at a standstill. General anti-overloading chain hoists using the occasion is very extensive, outdoor site, high-end production workshops, warehouses, power plants and other of the anti-overloading chain hoists are used.
In order to ensure the safe use of customers, each anti-overloading  chain Block  in the factory will go through rigorous testing regulation. Meet the requirements before leaving the factory, inspection is very strict. Please the majority of customers read the instruction manual before use.