No response or action of operation keys

1. If the push rod itself makes abnormal noise → the movement electromagnetic sound is loud → the bearing sound is loud → the worm and bevel gear are not meshed well → the external force strikes the motor to cause abnormal sound → the torsion spring makes abnormal noise → knocking and wiping the pipe
2. Abnormal noise caused by improper use → improper selection of pin shaft → abnormal noise caused by interference → large deviation of hole center before and after push rod installation
The customer's own structure makes abnormal noise