The ratchet pawl device is a ratchet stopper, which is generally used as a reversal control device in machinery to prevent reversal or for intermittent transmission.
1. When the two sets of drive systems work normally:
1. When the main hoisting mechanism is lifted, the motor rotates counterclockwise to drive the high-speed shaft of the reducer, and rotates clockwise through the gear pair to drive the ratchet, and the ratchet drives the first intermediate shaft of the reducer through the pawl, and rotates clockwise through the gear pair to drive the drum group to lift the heavy object.
2. When the main hoisting mechanism descends, the motor rotates clockwise to drive the high-speed shaft of the reducer, drives the ratchet through the gear pair, drives the drum group to rotate counterclockwise due to the mass of the weight itself, and drives the first intermediate shaft of the reducer and the pawl to rotate counterclockwise through the gear pair; The motor rotates clockwise to drive the high-speed shaft of the reducer, and rotates counterclockwise through the gear pair drive ratchet. When the counterclockwise rotation speed of the pawl caused by the weight falling is greater than the counterclockwise rotation speed of the ratchet driven by the electric motor, the pawl meshes with the ratchet, and the descending speed of the heavy object is controlled by the motor.
2. When a set of drive systems is working:
1. When the faulty motor end does not brake, the system works the same as the normal operation of the two drive systems.
2. When the faulty motor end brakes, the ratchet at the brake end stops and does not rotate, and the pawl can only rotate in one direction. Therefore, the lifting mechanism can only lift and not descend under the action of the motor. When descending, the brake end brake needs to be opened, and the heavy object is lowered by the motor drive at the other end.