Device and method for automatically adjusting arc to improve grinding precision of carbon brushes of large water turbines

Abstract

A device and method for automatically adjusting the arc to improve the grinding precision of a carbon brush of a large water turbine, which includes a mounting plate, a grinding device, an adjusting mechanism, a tensioning mechanism, a brush holder and a vacuum cleaner. The device and the brush holder, the dust suction cover of the vacuum cleaner is connected with the dust suction hole, the arc adjustment block of the adjustment mechanism is in contact with the elastic plate in the grinding device, the tension wheel of the tension mechanism is rolled and matched with the grinding belt, and the adjustment mechanism adjusts the elastic plate The arc is consistent with the arc to be ground by the carbon brush. The tension mechanism tensions the grinding belt. The carbon brush is located in the brush box and respectively conflicts with the grinding belt and the coil spring. The grinding motor drives the grinding belt to roll and grind. The invention overcomes the problem that the original carbon brush cannot reach the precision of being in close contact with the collector ring after grinding, thereby affecting the stable operation of the unit. It has a simple structure, can grind multiple carbon brushes at the same time at one time, can adjust the grinding arc, has high grinding precision, and is automatic. High grinding efficiency, simple and convenient operation.

Description

technical field [0001] The invention belongs to the technical field of generator installation, and relates to a device and a method for automatically adjusting arcs and improving the grinding precision of carbon brushes of large water turbines. Background technique [0002] Large and giant hydroelectric generators are the core components of super hydropower stations. The principle of the synchronous motor in the unit is to convert the mechanical energy of the hydro turbine into electrical energy. The main components of the synchronous generator are the stator and the rotor. Among them, the excitation current generated by the excitation system passes through the excitation cable on the rotor, the carbon brush on the brush holder, the slip ring device, the large shaft lead wire, and flows into the magnetic pole coil on the excitation winding to generate a constant magnetic field. The rotor rotates under the drive of the water turbine, and the stator winding of the generator co...

AI Technical Summary

Problems solved by technology

[0004] In the slip ring chamber, the surface of the slip ring is rubbed and polished. The space is narrow, the operation is inconvenient, and there is a danger of personal electric shock. At present, the arc surface is manually polished, and the accuracy is difficult to guarantee. When the arc surface is not in close contact with the collector ring , there will be uneven current distribution, ignition, overheating and other phenomena, which will affect the safe and stable operation of the generator set

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