How do you install and operate a single-chain electric hoist?

How to install and operate a single-chain electric hoist? Provided by Hummer Crane. The BCD explosion-proof electric hoist can be used in conjunction with the BX explosion-proof single-girder suspended crane or the BQ explosion-proof single-girder bridge crane, depending on specific application requirements. The explosion-proof marking for the “flameproof” wire-rope electric hoist is dII BT4 and dII CT4, making it suitable for Zone 1 and Zone 2 locations where explosive gas mixtures are present, consisting of flammable gases or vapors of IIA, IIB, and IIC categories, with temperature classes T1 to T4, in combination with air.

1. Each newly installed single-chain electric hoist shall be run idly several times. Prior to normal operation, a dynamic load test at 10% of the rated capacity shall be conducted, with repeated lifting and lowering cycles. After moving the hoist, inspect the mechanical transmission, electrical components, and connecting parts to ensure they are functioning properly and reliably. Subsequently, perform a static load test at 25% overload: lift the load approximately 100 mm off the ground and hold it suspended for 10 minutes. After unloading, verify that all functions are operating normally.

2. Before each use, the electric hoist shall be run idly under load several times, and the following items shall be inspected: (1) whether the pushbuttons can properly control the hoisting and operation of the electric hoist; (2) whether the limit device is flexible and reliable; (3) whether there are any abnormal noises or odors during operation; and (4) whether the wire rope is wound in an orderly manner in the grooves of the drum, whether the wire rope is securely held in the grooves by the automatic action of the hook, and whether the wire rope between the hook and the drum is kinked. If any abnormalities are detected, they shall be promptly rectified before use.

3. During operation, the hoist must not be used in unauthorized environments or under conditions exceeding its rated load. Tilting lifting or horizontal dragging of the load is prohibited. The limit switch is a safety device designed to prevent accidents by preventing the hook from rising or descending beyond its extreme travel limits; therefore, the limit switch must not be used as a power on/off switch. After work is completed, the main power switch must be pulled to disconnect the power supply. Explosion-proof electric hoists shall be operated only by designated personnel who are thoroughly familiar with explosion-proof safety requirements and the complete operating procedures.

4. During shift handover, inspect the wire rope for bends or knots, protruding or excessively twisted strands, any signs of surface distortion, broken strands or individual wires, secure end connections, cleanliness of the wire rope, and adequate lubrication. When operating an explosion-proof electric hoist, the load must not be suspended in the air for extended periods to prevent deformation. If a serious malfunction occurs during operation, immediately disconnect the power supply.

5. Each time a lift is initiated, it is recommended to briefly press the button to tension the wire rope before lifting the load. The buffers or stop plates at both ends of the I-beam runway are intended solely as time-limiting devices in the event of an accident and should not be subjected to frequent impacts during routine operations. It is strictly prohibited to lift loads over personnel or critical equipment to prevent accidents. If the brake fails during operation and the load descends rapidly, immediately press the raise button to lift the load by a safe distance, then press the lower button to lower the load at a normal speed. After unloading, promptly identify the cause and eliminate the fault.

6. Single-chain electric hoists shall be inspected by qualified personnel at least once every ten days. Any faults detected shall be promptly addressed, and detailed records shall be maintained. Inspections shall cover explosion-proof motors, explosion-proof magnetic starters, explosion-proof limit switches, and explosion-proof push-button switches. If the explosion-proof enclosure needs to be disassembled, first disconnect the power supply and proceed with caution. During disassembly, care must be taken to protect the flameproof surfaces to prevent impacts that could damage these surfaces and potentially lead to an explosion. An explosion-proof enclosure shall be scrapped if it is cracked, has air leaks, or its flameproof surfaces are abraded. When installing the flameproof enclosure, all bolts must be tightened securely to prevent loosening.