Modified grinder cupula magnetizing and demagnetization controller

Abstract

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.

Description

technical field [0001] The invention relates to a charge and demagnetization controller, in particular to an improved charge and demagnetization controller for an electromagnetic chuck of a grinding machine. Background technique [0002] Surface grinders usually use electromagnetic chucks to clamp workpieces. In order to reliably attract and remove workpieces conveniently, the design of the charge and demagnetization control circuit of the electromagnetic chuck is very important. The more advanced charge and demagnetization controller currently used in our country controls the magnitude of the voltage by controlling the trigger conduction of the thyristor, and completes the direction switching of the voltage by controlling the internal and external relays (or contactors), or through The main circuit consists of four power tubes connected in a bridge type to form an H-bridge inverter to output DC voltage with adjustable amplitude and direction for non-contact output, directly...

AI Technical Summary

Problems solved by technology

[0003] However, there are still many deficiencies in these current charging and demagnetizing devices: ①Frequent switching of relay contacts will cause electric corrosion due to arcing, affecting conduction or adhesion, thus making the product invalid

②Simple forward and reverse switching can not demagnetize the workpiece very well, and the demagnetization effect is very poor; ③Although the demagnetization effect of "Grinder Electromagnetic Chuck Charging and Demagnetization Controller" is good, the output power of the main circuit H bridge is relatively large, and the device is easy to work for a long time. The device is damaged due to heat generation, and the failure rate is high

④ There are two relays connected to the opposite corner of the main circuit H bridge, and the voltage cannot be adjusted during magnetization.

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