The invention provides an improved grinder sucker magnetizing and demagnetizing controller, which consists of a main circuit and a
control circuit. The main circuit includes an H-bridge inverting circuit, and the
control circuit includes positive and negative switch control and
amplitude control of output
voltage. The upper tube at one side of the H-bridge inverting circuit is connected with a
relay at the two ends respectively, which is in parallel connection with a power tube and in connection with a filtering circuit. In magnetizing, the invention transmits adjustable
DC voltage through
relay and power tube, and in demagnetizing, the invention transmits adjustable
voltage after alternative connection, and is connected with electromagnetic sucker directly; the
control circuit consists of a SCM, a photoelectric coupler, and a
timer, which are connected with each other. The control circuit makes positive and negative switch on output
voltage and transmits the
voltage amplitude. By making magnetizing voltage adjustable, the invention enhances the magnetizing precision, lowers magnetizing
power consumption, and reinforces the performances of anti-disturbance and liability. The H-bridge transmits adjustable and excellent demagnetizing effect; after tests, all performance indexes are proved to be superior to those of prior arts. Furthermore, the invention has the advantages of high reliability, good anti-disturbance, simple structure, and convenient installation.