Single rope winding lifting equipment

An earlier onset , it is reliable, simple structure, but only for shallow and medium depth of the mine , and the terminal load is not too large . For deep wells and the terminal load is large, a large rope and hoist upgrade roll diameter , resulting in a hoist equipmentlarge volume , gravity soared, making the hoisting rope and hoist the manufacture , transport and use on both inconvenience. Thus , to a liftech cheap wire rope hoistcertain extent, limit the single rope winding hoist used in deep well conditions. Friction appears to enhance its development machine , to a certain extent, solve the single rope winding hoist that appear under the condition of deep problems. However , things are always divided into two . Generally used to enhance the friction tail rope balanced tension at both ends to reduce the error and improve reliability. Thus , the container connection with hoisting rope rope section , the static stress changes with position changes of the container . When the container is located in the unloading liftech hoist and trolleyposition the wellhead , the gravity of the entire container and the end of the gravity are acting on the rope of the section ; arrival when the container bottom before loading position to withstand only the gravity of the section of the container. In other words, the entire upgrade process, with the hoisting rope section of the vessel to bear in connection with an amplitude of . static stress changes σj = qH / S0 of (q is the tail rope per meter gravity , N / m H as lifting height , m S0 to enhance the cross sectional area of ​​the wire rope , cm2).

Introduction to the control circuit and maintenance of electric hoist

Electric hoist is a small weight, simple structure of a kind of hoisting machinery, widely used in industrial enterprises in the lifting installation of small equipment, has small occupied area is small, convenient use, etc. Electric hoist have two hoisting mechanism and a mobile device, structure associated with each other, they are all have Manual block own motor drive. Electric hoist lifting and lowering is motor driven by gear box for car motor through the role of the idler pulley, walking back and forth on the h beam movement, rising and falling, by line with limit switch to control the itinerary. Commonly used electric hoist are: 2 t, 3 t, 5 t with conical rotor motor, motor stator and rotor are tapered, after electrify with the establishment of the magnetic field and rotor shaft Hoist and trolley the fan wheel to overcome the spring force to produce axial movement, fan wheel conical brake ring out of the back cover, out of control, the rotor of the motor can operate freely, cone-shaped brake laps in the spring when the power is cut off, and back cover tightly closed to control the braking of electric hoist motor circuit consists of: circuit breaker, contactor, transformer, terminal, control handle button, thermal relay, wires, slide wire cable (mobile), and other electrical components.

How explosion proof electric hoist

Explosion-proof electric wire rope hoist  electric hoist is more common but a rather special, mainly reflected in the "explosion" word, and from this we can see the word on the product's main performance, we described in detail below is proof electric hoist electric control system.

Explosion-proof electric hoist electric control system consists of explosion-proof hoist boxes, explosion-proof button control box, explosion off the fire limiter components. Explosion-proof electrical equipment enclosure closed securely  Explosion levels to meet the appropriate requirements of its internal functions and ordinary hoist electrical installations basically the same. Explosion-proof hoist box internal electrical components are of high quality, reliability and long life of Siemens low-voltage electrical components to minimize the explosion due to an electrical fault caused the number of boxes out of the box.manual hoist In addition to the control box to run the opposite direction contactors with electrical interlocking between the outer  button button control box is also provided with a mechanical interlock between avoid misuse caused by short circuit happening. Control button box with a fine wire hanging in the explosion-proof hoist box about 1.5m from the ground under high position in order to facilitate personnel. Reset button box with a rotary-type mushroom head type emergency stop switch in case of emergency to facilitate fast the motor is stopped. Button on the control box using the arrow mark internationally accepted symbols and safety AC 36V control voltage. Limiter off the fire-proof control box by the limiter and external guide rods. Wire rope on the drum Fairlead card board push rod limiter control box and then trigger action to cut off contacts Lifting motor power.hoist and trolley By adjusting the position of the guide rod can be set to hit the block hoist upper and lower limit position but must ensure that the hook reaches the lower limit bit  wire rope on the drum 2 laps still left margin (excluding the rope under pressure lap ).

Electric chain hoist cycles common sense protection

Any product has a protective cycle, electric hoist is no exception, if you can master the hoist protection period, hoist and trolley it will bring you great benefits, eliminating unnecessary overhead electric chain hoist purchase.
1 electric hoist in the design protection period, the surface does not exceed the ISO4628-3 rust rust grades in Ri3 level (equivalent to ASTMD610 of six or European standards Re3 grade)
2, A3.08, A3.11, A4.14, A4.15, etc. are ISO12944-5.
3, electric hoist the main consideration gloss finish selection and color retention, 4 files, PU412 aromatic polyurethane topcoat, PU413 aliphatic polyurethane topcoat, PU421 polyurethane topcoat electric hoist machinery, PU420 polyurethane engineering automotive finish.
4, no zinc primer (EPMisc.) consideration was mainly rust resistance and high solids, one can achieve a dry film thickness of 80 microns, optional epoxy zinc phosphate primer,wire rope winch epoxy bottom aluminum tripolyphosphate paint.
5, zinc-rich primer required dry film (or non-volatile parts of) zinc content (not the metal zinc content) ≥ 80%. Such as the use of the level GB_T_6890-2000 zinc (metallic zinc content ≥ 96%), the dry film can be converted into (or non-volatile parts of) zinc content (not the metal zinc content) ≥ 76.80%. Can also be taken as inorganic zinc (zinc silicate) primer.
6, the most commonly used in the paint is epoxy painted iron, because iron thin cloud is not high,manual block such as requiring a good surface appearance, good fineness can be replaced by an epoxy.

Factors affecting the quality of lifting chain

Lifting  hoist equipment  as an important accessory, chain hoist mass relation to the overall usage of the following lifting chain to introduce you to influence what factors?
1, lifting chain is divided into 80, 100, etc., the higher the level, the chain is relatively good quality
2, the same series of chain products, components and the materials according to the chain, the chain and the hinge attachment structure is divided varieties.
3, the chain selection of alloy steel, hardness, durability, safety coefficient is high, cast iron alloy is relatively poor quality.
4, lifting chain welding standards, purchase, pay attention to whether it is hand-welded chain, if the manual welding,load chain resistance to pressure the chain can not reach higher standards.
5, chain and monocyclic permanent elongation shall not exceed 5% of the original length
6, hanging chain permissible wear value must not exceed ring chain bar diameter or thickness of 10% of the aids.
7, the same species, according to the chain pitch, Rows,hoist and trolley ultimate tensile load chain width and the different divisions specifications.
Lifting chain in the field of lifting machinery is widely used as an accessory, I hope this article can help buyers identify the quality chain.

Electric wire rope hoist brake type

Under normal circumstances the hoist hoist brake mounted on the high speed shaft, and some brake is mounted on the low speed shaft or hoist drum, and its role is to prevent items falling off the shaft,hoist and trolley you can increase security, belonging to hoist the the mounting device is an integral part of the hoist, wire rope electric hoist in the following example, to introduce you to the type of brake.
Electric wire rope hoists are many types of brakes, the choice of a variety of factors need to be considered, because of the different use of the environment determines the electric hoist can adapt to the various components, can be used normally. If you choose incorrectly,manual hoist ranging from damage hoist machine, it caused heavy accidents.
Brake type selection, mainly based electric hoist standard requirements and the actual needs, determine the type of brake. Such as standards: hoisting mechanism, luffing mechanism must be set normally closed brake, walking or turning mechanism can be used normally closed brake.
Consider using environment and places, such as brake mounting there is enough space, the choice of block, arm band brake or disc brake,load chain space is limited value, can be used within the shoe or clamp disc brakes.

Climbing frame hoist the current market situation

  With the country on the micro economy turned on fortifications built slowed down the completion of all the original program names emerged early scene, while those who went the first three quarters,wire rope hoist climbing frame hoist sale rapids increased market situation has also emerged.
       Three quarters of 2011, their total sales climbing frame hoist 300 million units, an increase of 10.57%. Within the first quarter, sold 680,000 units, an increase of 42.90%; sold 890,000 units in the second quarter, down 2.29%; certainly have emerged in the third quarter,hoist and trolley the level of bounce, the cumulative sold 1.47 million units, down 10.45%.
       Climbing frame hoist which is occupied by relative market disadvantage, the market share of the enterprise skewed further to the handlebar, according to the manufacturer's main focus as well as by the level, with the crane's future has been stagnant, will gradually change the leader among the lifting career .
       After climbing frame on the front of the comprehensive market hoist, electric hoist climbing frame fortifications are being attack the market changes, the proliferation of business start climbing frame hoist care market,chain block because as the economy has been stagnant said, lifting the market will gradually recover .

Five Easy Tips to improve efficiency in the use of electric hoist

Based on years of work and technical personnel,hoist equipment laboratory lessons learned in the course of the following hoist the tips to help you work more efficiently.
1, wire rope electric hoist in the course of special attention, the rope must be wrapped properly, a reliable guide rope rope, rope chaos.
2, buttons parking off sensitive and reliable, consistent action buttons labeled with gourds.
3, limit movement reliable, accurate,lever hoist reliable and accurate protection of electric hoist safe operation.
4, electric hoist hook part to ensure that swung flexible.
5, reducer running, lifting reducer sound normal, motor brake, reliable, flexible trolleys, electric hoist protection when normal operation and safety.
Note:hoist and trolley The use of electric hoist before trial whether empty normal operation to protect the safe use of electric hoist.

Electric hoist inspection and maintenance are also cycle

Product inspection and maintenance are cycle electric hoist as small light lifting equipment is no exception,lever hoist not only to maintain but also to master the correct method hoist inspection and maintenance cycles can extend its life to ensure efficiency.
      Electric hoist parts more, different techniques for the various components of the characteristics of the actual work will be maintenance, inspection cycle is divided into weeks, months, years, the specific content of each period are as follows:
      A weekly maintenance and check again:
      1) Check the nut on the brake, the opening pin, the positioning plate is complete, loose, the lever and the spring no cracks; brake is reliable braking, the brake pad to open the opening when the brake should be less than 1.0mm and the brake wheel clearance distance should be equal on both sides of each axle pin may not have stuck.
      2) safety switches and limit switches are accurate, flexible and reliable work, especially electric hoist up limit is reliable.
      3) on the drum and pulley rope wound is normal,manual hoist without off-tank, channeling, knotted, twisted and so on.
      4) Check the hoisting mechanism coupling closures fastening screw is loose, the shortage.
      5) agencies transmission is normal, no abnormal sound.
      6) Check all lubrication lubrication condition is good.
      2, the monthly inspection and maintenance, inspection and maintenance, we cover the content but also have weekly:
      1) Check the wire rope for wear, if there is broken wire and so on, check the wire rope lubrication conditions.
      2) Check the hook for cracks, wear and tear of its dangerous section does not exceed 5% of the original thickness; hook nut locking device is complete.
      3) Check the motor, reducer bolts fastening the base and individually fastened.
      4) Check the gearbox lubrication conditions, the oil level should be within the specified range, measures should be taken against oil leakage sites prevent leakage.
      5) Check the balance at the rope pulleys for wear on pulleys and pulley shaft lubrication.
      6) Check the pulley position, to see whether it flexible, without damage, cracks, particular attention to the wear of the fixed pulley shaft.
      7) Check the brake wheel, uneven surface of its work should not exceed 1.5mm, brake wheel should not have cracks, its radial runout should be less than 0.3mm.
      8) Check the coupling, which should not be on the key and keyway damage, loose.
      9) Check the size of the vehicle operating conditions, should not have gnawing rails, three fulcrum,hoist and trolley when the pendulum starts and stops and so on.
      10) on the hoist to conduct a comprehensive clean, remove dirt on it.

Stage-specific hoist use, maintenance and testing

   Stage-specific part of the  manual hoist  electric hoist in strict accordance with touring exhibitions requirements design, black surface treatment, 110 volt control circuit heat treatment, forming a steel chain guide plate to the positive and negative way and designed to be used around the clock, with adjustable screw limit switches, higher reliability, chain galvanized, rust, grease installed in the gear box, to prevent the oil droplets penetrate into the arena.
Stage electric hoist used:
Electric hoist operating voltage and frequency are marked on the motor nameplate rated voltage on in connection stage before powering electric chain hoist definitely want to check these figures consistent with those of the supply voltage. Stage hoist hanging point should be an appropriate size to accommodate the arena of electric chain  lift hoist  hook or hooks at the top of the eye and allow it, on a modest placed in the saddle and it must be competent enough to support the crane lifting capacity at maximum power .
Stage electric hoist maintenance:
1, electric hoist initial lubrication:
Bearing Chain: refining of the entire length will need to be lubricated, including through the chain CHAIN ​​place to be determined is the contact point between the connecting rod is to be properly lubricated.
Gearbox: ambient temperature is about -10 ℃ to +50 ℃ between, you should use 220mm2 / S 40 ℃ temperature and high pressure gear oils with additives, gear oil specifications for DIN51502CLP220.
2, electric hoist objects surrounding the removal of:
Electric chain hoist will need to be hung in a place without hindrance. Suspension point should be a position that allows carrying hooks and any anticipated load for rising and falling action unhindered. Lumps must not hit bottom ground, if there is a need,hoist and trolley in the refining end of the slack adjustment CHAIN ​​stopped position.
Stage electric hoist final test:
Electric chain hoist on stage after completing the assembly, but the crane being used in normal operation, the following procedure should be performed. Isolated Power: Check all mechanical and electrical connections and connections are locked and is solid.

Rotating hook prevention and avoidance measures

      In practice, the following measures can be taken to improve the stability of the hook in order to reduce the possibility of rotating the hook:
       (1) When a plurality of pulleys hook,lift hoist and boom to the extent possible with the use of a pulley on the outside by a pulley;
       (2) there are multiple hooks on the crane when possible, use larger diameter pulleys;
       (3) make use of wire rope double the number of the number of horses; conditions permit, try to use more number of horses to reduce the single-piece force;
       (4) around the wire rope wear, the top section of the crane hook pulley and not between the pulleys shifted too much to reduce the rise and fall of the hook wire rope hooks horizontal rotational force generated;
       (5) in the lifting process,lever hoist the boom top and the hook as far as possible to reduce the length of wire between, for example, using methods such as larger span;
       (6) When lifting, use slip rope hanging objects to be controlled so that, if the lifting height is relatively high, but is not required to rotate the hook in place, you can lock the hook;
       (7) when lifting the driver to have a smooth operation, landing hooks and rotary movements do not simultaneously;
       (8) Optional rope when other conditions are met in the case, try to choose "no spin" rope;
       (9) crane wire rope used for a period of time,hoist and trolley or to re-wear around the fixed end untied the rope release torque.

Rotation causes the hook

   Causes rotation causes the crane hook internal and external factors.
       Hook rotating internal reasons but also its root causes.
       Lifting machinery (such as:wire rope winch electric hoists, chain hoists) rope used either type, size, grade, will be in force when torque is generated. Torque is due to the rope caused by manufacturing methods, first wire helically twisted together to form a stock, and then a few shares and spirally twisted together to form a rope. When the force, the wires and stocks will be straightened, but when lifting operations rope ends are fixed,load chain so that torque is formed inside the rope. Another source of torque is formed wire pitch in use for some time becomes long, so that it is fixed at the end of the case, the rope is unstressed will produce a torque, the torque the presence of a rotating hook assembly trend .
       On the other hand there are many external factors that lead directly hook rotation, such as lifting process of manpower hook external force such as the wind turning drivers operate heavy swinging hook and the instability that led to rotating hook,hoist and trolley hook for wear around the way resulting imbalance hook hook rotation.

Safety procedures and precautions

1 Only trained personnel may operate the hoist.
(2) If there is no electric lift hoist  limit switch, to strictly control the hoist does not rise too high or drop too low, so as not to pull off the heavy chain pin, dangerous.
(3) Do the following end hook hanging objects must be correct in all studies within the tongue.
4 Do not use substandard lifting chain or rope.
5 Do not use the voltage specified range Frequency (HZ)
6 To avoid electric shock, before they can be fully grounded.
7 attention to the power of three-phase or single-phase voltage magnitude.
8 electric  manual hoist  strength enough to be installed in the structure.
9 In the reverse actuation ago Remember determine the motor has completely stopped before performing, non-sudden reverse operation.
10 Avoid strenuous lifting up and down.
11 Install electric hoist, hoist and trolley the power cord Do not pass through the gear box above the rings.

Buy electric hoist, please choose the regular manufacturers.

Stage electric hoist motors sealed in aluminum rims cylindrical motor housing Nagakubo

Stage-specific part of the chain hoist electric hoist, also called the  lift hoist .  Stage electric hoist in strict accordance with touring exhibitions to design production, surface treatment black, bright lasting, 110 volt control circuit heat treatment, forming a steel chain guide plate to the positive and negative way and designed to be used around the clock, with a can adjusting screw limit switches, higher reliability, chain galvanized, rust, grease packed in the gear box, to prevent the oil droplets penetrate into the arena,  rope hoist  motors sealed in aluminum rims cylindrical housing within the permanent warranty motors, suitable for use with a variety of controllers and circuit distributor connected.

Stage electric hoist features:
An efficient, lightweight motors, non-asbestos brake system, low energy consumption.
2, stamping steel shell, lightweight and sturdy.
3, high-strength safety hook to withstand impact of accidental overload fracture does not occur, overweight only gradually deformed.
4, lightweight, attractive and durable molded chain bag.
5, the limit switch: limit switch hanging under the hanging device, the motor automatically stops to prevent the chain beyond, to ensure safety.
6, heat-treated steel chain guide plate forming.
7, easy to operate,hoist and trolley easy to maintain.
8, with positive and negative way and all-weather use and design.
9, with adjustable screw limit switches, higher reliability.
10, chain galvanized, rust.
11, mounted on the gear box grease to prevent oil droplets penetrate into the arena.
12, hoist motors sealed in aluminum rims cylindrical enclosure permanently protect motors.
13, suitable for use with a variety of controllers and circuit distributor connected.

Different places using different types of lifting tackle

      Hoist and trolley  mainly used in factories, mines, agriculture, electricity, construction and other production and construction, piers, docks, warehouses and cargo lifting machinery installation work. The following block types to introduce you to hope for the procurement tackle help.
      There are wooden pulley, short axis, ropes, pulleys and the main core component composition.  hoist and trolley  tonnage according to the bearing can be divided into Hook lift slip hanger hoists, chain link hoists, hangers hoists. According to the number of rounds can be divided into single-door pulley, pulley and multi-door two-door pulley. By pulley and hanging objects can be divided into hook type pulley, chain pulley, rings and hanger-type block-type block of four.
      Pulley is mainly used to heavy lifting, the structure is very simple, easy to use, in recent years by the plant, construction of all ages, different places tackles different types before buying need to explain your use of occasions and requirements.