When facing the problem that the handle of a chain hoist can only rise but cannot descend, the following steps can be taken to handle it:

Check power and voltage:

Ensure that the power supply of the elevator is properly connected and the voltage is stable.

Check if the normally closed valve power supply is connected or if the voltage is sufficient. If the power supply is not connected or the voltage is insufficient, it is necessary to wire it correctly and check the voltage.

Check the electrical control system:

Check the electrical control system for potential leakage hazards and ensure that all bolts are not loose.

Check whether the motor wiring is correct, whether the motor grounding is good, and whether the motor rotation meets the requirements.

Check the normally closed valve and related components:

Check if the voltage and voltage type of the normally closed valve coil are consistent with the power supply voltage and type.

If the coil of the normally closed valve is burnt out, a new coil needs to be replaced.

Check if the back cap of the normally closed valve is loose. If it is loose, tighten it.

If the normally closed valve gets stuck, it needs to be removed for cleaning.

Check the descent speed control valve:

Check if the descent speed control valve is tightly closed. If it is tightly closed, it needs to be opened.

Check the mechanical part:

Check if the steel wire rope is damaged and replace it if necessary.

Check if the brake blade is in the middle position to ensure that the braking system is working properly.

Check if the protective fence is damaged or deformed, and if so, repair or replace it.

Safety operating procedures:

Before conducting any maintenance or inspection, ensure that all safety operating procedures have been followed, including cutting off power, using appropriate personal protective equipment, etc.

It is prohibited to dismantle any components arbitrarily, and it is not allowed to pry up chains with iron rods or smash heavy objects with a hammer.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment