1. Are electric hoist bridge cranes special equipment?
The electric hoist gantry cranes, bridge cranes, and electric hoist single-girder cranes we often talk about are special equipment. It is within the scope of equipment management, but a single electric hoist does not belong to special equipment.
For cranes with a rated lifting capacity of 0.3 to 80 tons, a vertical lifting height of 3 meters or a hovering device above 2 floors, the electric hoist is an important component and must be integrated into special equipment as a whole.
2. Electric Hoist Crane Safety Skills Operating Procedures
1. Electric hoists that are newly installed or installed after disassembly and inspection should first be tested empty for several times. But before the installation is completed, do not turn on the power and try to run.
2. The dynamic load test is to perform repeated lifting and left-right movement experiments with additional load weight. After the test, check whether the mechanical transmission part, electrical part and connecting part are normal and reliable.
3. When debugging and maintaining the device, it is necessary to strictly check whether the limit device is flexible and reliable. When the hook is raised to the upper limit position, the distance between the hook shell and the drum shell must be greater than 50mm (10 , 16t, 20t must be larger than 120mm). When the hook is lowered to the lower limit position, the safety circle of the wire rope on the drum should be ensured. The effective safety circle must be more than 2 circles.
4. The electric hoist should be operated by a dedicated person with a certificate. The operator should fully grasp the safety operating procedures. It is prohibited to pull or lift at an angle, and it is prohibited to operate by non-staff personnel. During use, it is absolutely prohibited to use it under impermissible circumstances, or when the additional load and additional closing times per hour (120 times) are exceeded. When lifting, do not hold your hands between the rope and the object. When the hanging object is rising, be careful not to collide.
5. Before lifting, check the mechanical parts of the equipment. The wire ropes, hooks, limiters, etc. should be intact. Check the electrical parts for leakage and the grounding device should be prominent. Every time you lift a heavy object, you should stop the car and check the braking condition when it is lifted 10cm from the ground. You can start the operation only after confirming that it is intact. Rainproof shelters should be installed for open-air operations.
6. Lifting objects must be tied firmly and centered. When walking with a hoist, the weight should not be too high off the ground. It is prohibited to pass heavy objects over people’s heads. Do not hang heavy objects in the air during work gaps.
7. If the electric hoist produces a peculiar smell during the lifting process and the temperature is high, you should immediately stop the vehicle and check to find out the cause and deal with it before continuing the operation.
8.The electric hoist wire rope should be wound neatly on the drum. When the hook is placed in the lowest position, the wire rope on the drum should be no less than three turns.
9. When using a suspended cable electrical switch to start, the insulation must be good, the sliding must be free, and the button must be operated correctly and pay attention to the standing position of the person.
10. When lifting, if a fault causes the heavy object to slide down, emergency measures must be taken to lower the heavy object to an unattended place.
11. When lifting heavy objects, it is necessary to lift them vertically. It is not allowed to pull heavy objects diagonally. Do not lift objects whose weight is unclear.
12. After the operation is completed, the electric hoist should stop at the designated position, the hook should be raised, and the power supply should be cut off.
13. It is not allowed to press two flashlight door buttons that make the electric hoist move in opposite directions at the same time.
14. After the work is completed, the main switch of the power supply must be opened and the power supply must be cut off.
15. During use, specialized personnel must regularly inspect the electric hoist, take timely measures if any faults are found, and record them carefully.
16. When adjusting the braking sliding amount of the electric hoist, it should be ensured that the braking sliding amount S≤V/100 under the rated load (V is the distance for stable lifting of the load within one minute).
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