Fault detector for brake shoe of elevator driving main machine

The invention belongs to the technical field of elevator detection equipment, and particularly relates to a fault detector for a brake shoe of an elevator driving main machine. The fault detector forthe brake shoe of the elevator driving main machine comprises a brake wheel fixed on an output shaft of the driving main machine, a band-type brake device arranged on the outer side of the brake wheeland a detection circuit, wherein two conductive contact columns easy to wear are installed on one arc-shaped band-type brake arm; insulation installation pieces are arranged between the conductive contact columns and the arc-shaped band-type brake arms; the detection circuit comprises a main loop and an auxiliary loop; the main loop comprises an indicating lamp, a contactor KM and a main contactof the contactor KM which are connected in series in the circuit; the auxiliary loop comprises a sealing breakdown mechanism and two conductive contact columns which are connected in series; the auxiliary loop is connected with