Double Speed Electric Hoist Composition and Precautions

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Double Speed Electric Hoist

Double speed electric hoist is a small-sized lifting equipment, which is installed on the single girder, bridge cranes, gantry cranes, jib cranes for material handling. As one of the commonly used material handling equipment, the double speed electric hoist is usually used in factory, mining, railway, port, and storage, etc.

The double speed electric hoist crane manufacturer has two speed options which coordinate with each other to realize the efficient material handling work with precision. The lifting capacity of double speed electric hoist is 0.5 – 32 ton and the working class is M3 and M4. The main parameter of double speed electric hoist is as follow:

Product Type: MD1
Lifting Capacity: 0.5~32t
Lifting Height:  6~50m
Working Class: M3,M4
Ambient Temperature: -25~40℃

Component of double girder electric hoist

The main component of double speed electric hoist is gearbox, trolley traveling mechanism, drum, hook, coupling, limit switch etc.

Precautions

The new installation double speed hoist should be testing with empty load several times. But testing should not be done before installation work finished.

Before the double speed electric hoist put into usage, the electric hoist should be tested by lifting 125% load above ground level 100mm for 10 minutes’ time to check whether it is qualified.

Dynamic load test for the electric hoist is to lift rated capacity load repeatedly in every direction, after dynamic load test, all the mechanical and electrical components should be checked to see whether all components is qualified.

• Among electric hoist usage, the following circumstances is prohibited: overload lifting, lift more than 120 times in one hour, operation under prohibited environment.
• Among the electric hoist installation and maintenance, the limit switch device should be strictly checked in qualified state, when the hook is at upper limit position, the distance from hook shell to drum shell should be more than 50mm(10t,16t and 20t hoist should be more than 120mm). When the hook is at lower limit position, the wire rope should have at least 2 effective laps on the drum.
• It is prohibited to press two opposite movement button at the same time.
• When the double speed electric hoist is off duty, cut off the power.
• The double speed electric hoist should be operated by professional person, the hoist operator should be aware of all the safety operating rules, non-straight lifting operation should be strictly prohibited.
• Regular maintenance should be done among electric hoist usage, timely measures should be taken if any problem happens, and take record carefully.
• There should be enough lubrication oil among hoist usage, and keep the oil clean without any dirt.
• Stiff brush or small piece of wood should be used to make the wire rope oiled, directly by hand is prohibited.
• When double speed hoist if off duty, it is prohibited to hang load in the air, in order to prevent deformation.
• If any problem happen among operation, hoist should be cut off power immediately.
• After continuous operation of 10~20Ton double speed electric hoist, automatic power-off circumstance may occur, it is a function of the motor overheating protection, when this circumstance happens, the operation should be stopped till the motor becomes cool down.
  

Double Speed Electric Hoist Composition and Precautions