Elimination method of non magnetic force of the ho

2022-09-23
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Elimination method of electromagnetic chuck without magnetic force

elimination method of electromagnetic chuck without magnetic force from domestic point of view

how can we find and eliminate the fault that the electromagnetic chuck of the surface grinder has no magnetic force and the grinding wheel motor cannot be started

press the button of the grinding wheel motor and start the electromagnetic chuck switch. The workpiece cannot be pulled in. Because the contact of the relay is interlocked, the grinding wheel motor cannot be started at the same time. Open the power distribution box of the machine tool, check the power at both ends of the fuse with a test pencil, and then measure the power supply voltage of 380V with a multimeter at the AC 500V gear. Disconnect the main power switch, check whether the AC contactor is mechanically stuck, remove one coil wire of the contactor, measure the resistance at both ends of the coil with a multimeter resistance block, and the gauge needle indicates normally, which proves that the coil is in good condition

connect the coil wire, remove the undervoltage relay housing, measure the resistance at both ends of the coil, and the gauge needle still indicates that the undervoltage relay coil is not open, and then check whether the relay is mechanically stuck. Then close the upper power switch, measure the voltage at the secondary side of the transformer with the AC Gear of the multimeter to 135 V, and change the DC gear to measure the voltage at both ends of the rectifier diode of the intensity drop. Under normal circumstances, the DC voltage output by the bridge rectifier should be 110V, and there is no voltage output at this time. Disconnect the main power switch, measure the four rectifiers with the resistance block of the multimeter, which caused the cost of the paper packaging market to expand, and found that there was a problem with two tubes. Weld the wire connecting the diode, remove the diode, and conduct measurement and inspection again to prove that the tube has been broken down. Replace two new secondary pipes, connect the wires, and check whether the welding is firm. Turn on the main power switch, and measure both ends of the rectifier diode with the DC gear of the multimeter. There is a voltage indication, and the voltage value is 110V. The operator presses the button of the grinding wheel motor and starts the electromagnetic chuck switch. The workpiece can be pulled in, and the fault has been eliminated

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