The winch is now dominated by electric winch. It can be used alone or as a component in machinery such as lifting, road construction and mine hoisting. It is widely used because of its simple operation, large amount of rope winding, and convenient displacement. However, there will be some hidden dangers in daily operation. This article will tell you the hidden dangers and precautions of the winch.
1. The hidden danger of the winch
1. The winch is not firmly fixed, and the ground anchor is not firmly set, causing the winch to shift and overturn.
2. There is no protective device on the reel to prevent the steel wire from slipping or the protection device is set unreasonably and unreliably, causing the steel wire to separate from the hoist.
3. The end of the wire rope is not fixed or does not meet the requirements, causing the wire rope to fall off.
4. The brake of the hoist fails and cannot be positioned.
5. Inaccurate positioning of the shaft end of the rope drum causes shaft fatigue fracture.
Second, the precautions of the winch
a. Precautions when using the winch:
1. The wire rope on the reel should be neatly arranged. If overlap and diagonal winding are found, the machine should be stopped and rearranged. It is strictly forbidden to step on the wire rope with hands and feet during rotation. The wire rope is not allowed to be fully unwound, at least three turns should be kept.
2. The wire rope is not allowed to be knotted or twisted. When the wire breakage exceeds 10% within one pitch, it should be replaced.
3. During the operation, no one may cross the wire rope. After the object (object) is lifted, the operator shall not leave the hoist. Objects or cages should be lowered to the ground during rest.
4. During the operation, the driver and the signalman shall maintain good visibility with the lifting objects. The driver and the signalman shall cooperate closely and obey the unified command of the signal.
5. If there is a power outage during the operation, the power supply should be cut off to lower the lifting object to the ground.
6. Observe the signal of the commander during work, the signal is unknown or may cause an accident
When the operation is suspended, the operation can be continued only after the situation is clarified.
7. Sudden power failure during the operation, the knife should be pulled away immediately and the transported goods should be put down.
8. After the operation is completed, the material tray should be grounded and the electric box should be locked.
9. The wear of the wire rope and the machine during use. The local damage of spontaneous corrosion is inevitable, and the protective oil should be painted at intervals.
10. The use of overload is strictly prohibited. That is, the maximum tonnage is exceeded.
11. Pay attention to avoid knotting, flattening, arc damage, chemical medium erosion during use.
12. Do not directly lift high-temperature objects, and add protective plates for angular objects.
13. The steel wire rope used should be checked frequently during use, and scrapped immediately when it reaches the scrapping standard.
b. The scrapping standard of the steel wire rope of the hoist
1. The diameter is reduced;
If the diameter wear exceeds 40%, it should be scrapped. If it does not exceed 40%, the coefficient should be reduced.
2. Surface corrosion;
When the corrosion of the entire wire rope surface is obvious to the naked eye, the wire rope cannot be used.
3. Structural damage;
The whole broken wire rope should be scrapped, and the wire rope with broken wire should be used with a reduced coefficient.
4. Overload;
Wire rope used for overloading shall not be used.
