Grinder chuck magnetizing and demagnetizing controller

Abstract

The grinder chuck magnetizing and demagnetizing controller has one main loop and one monolithic computer control loop. The main loop includes one H-bridge inverter circuit and two relays connected to the opposite angle of the H-bridge inverter circuit. During magnetizing, DC voltage is output through the relays, and during demagnetizing, the output is switched to the H-bridge inverter circuit and connected to the electromagnetic chuck. The control loop with monolithic computer controls the switching of the output voltage and the control of the output voltage amplitude. The present invention has rectifying bridge plus relay has high voltage fluctuation resistance, high antijamming capability, excellent demagnetizing effect, greatly lowered magnetizing power consumption and other advantages.

Description

technical field [0001] The invention relates to a charge and demagnetization controller, in particular to a charge and demagnetization controller for an electromagnetic chuck of a grinder. Background technique [0002] Surface grinders usually use electromagnetic chucks to clamp the workpiece. In order to reliably attract and remove the workpiece conveniently, the design of the charge and demagnetization control circuit of the electromagnetic chuck is particularly 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 Four power tubes are bridge-connected to form the main circuit of the H-bridge inverter, which outputs a DC voltage with adjustable amplitude and direction, and performs non-contact output and is dire...

AI Technical Summary

Problems solved by technology

[0003] However, there are still many deficiencies in these current charging and demagnetizing devices: ① Frequent switching of relay contacts will cause electric corrosion due to arcing, affecting conduction or adhesion, thereby making the product invalid; ② Simple forward and reverse Switching can not demagnetize the workpiece very well, and the demagnetization effect is very poor; ③ Although the demagnetization effect of "Grinder Electromagnetic Chuck Charging and Demagnetization Controller" is good, but the output power of the main circuit H bridge is relatively large, and the device is prone to heat and cause damage to the device after a long time working , high failure rate

In addition, there are disadvantages such as poor reliability, long demagnetization time and low precision, poor anti-interference, etc.

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