When the electric chain hoist is not used for a long time, people may mistakenly adjust the brake adjusting nut or the brake ring will wear too much, which will reduce the pressure of the brake spring and reduce the braking force. When the machine stops, the braking is unreliable and the sliding distance exceeds the specified requirements. In this case, just readjust the brake nut according to the instructions. However, it is forbidden to adjust, inspect and repair the brake when lifting heavy objects during work. After adjusting the brake nut, the sliding distance of the electric chain hoist at stop still exceeds the specified requirements. Other reasons should be considered when such a situation is encountered.
First, disassemble the brake ring and check whether there is oil on the brake surface. If there is oil on the surface, the coefficient of friction will be reduced, causing it to slide down during braking. The sliding distance exceeds the specified requirements. It is not useful to only adjust the brake nut. At this time, only Thoroughly clean the brake surface (clean and easy to use light gasoline) to restore the friction coefficient of the brake surface.
Secondly, if the brake ring or damaged brake ring cannot guarantee effective braking, the only way to replace the brake ring is to adjust the brake as follows:
- Remove the rear cover of the motor;
- Remove the adjusting screw of the motor shaft end of the electric chain hoist, increase the braking torque and turn the lock nut clockwise or counterclockwise, generally adjust 30°-90° each time, and reduce the braking torque to lock the lock nut The direction of rotation is opposite;
- Install each piece in turn in the reverse order of disassembly.
- Observe the amount of shaft movement of the motor shaft after adjustment, generally 1.5mm is appropriate.