Closed carbon brush grinding tool

Abstract

The invention relates to the field of electric power overhaul, in particular to a closed carbon brush grinding tool. The closed carbon brush grinding tool is applied to the carbon brush replacing and grinding work of a stator sub-ring in a maintenance process of a water-turbine generator set. The closed carbon brush grinding tool comprises a dust collection box, wherein a driving wheel, a first driven wheel, a second driven wheel and a third driven wheel which are in transmission connection through an abrasive belt are arranged in the dust collection box, a plane grinding module is fixed between the driving wheel and the first driven wheel, and a plane grinding opening is formed in the upper surface of the dust collection box corresponding to the plane grinding module; an arc-shaped plane grinding module is arranged between the first driven wheel and the second driven wheel; the center of the third driven wheel is connected with a locking mechanism for adjusting the tightness of the abrasive belt; a carbon brush grinding brush holder which extends into the dust collection box and is obliquely arranged is arranged above the right part of the dust collection box; the rear side of the dust collection box is provided with a crank driving the whole device. The abrasive cloth is driven by wheels to move, meanwhile, two grinding openings are formed, the plane grinding module and the arc-shaped plane grinding module are arranged, grinding adapts to the carbon brush structure, the grinding precision is high, the maintenance labor intensity can be relieved, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the field of electric power maintenance, that is, a closed carbon brush grinding tool. It is applied to the carbon brush replacement and grinding work of the stator collector ring during the maintenance of the hydroelectric generator set. Background technique [0002] In the prior art, the replacement and installation of the stator collector ring carbon brushes during the C-level (or D-level) maintenance of the hydro-generator set is an important maintenance item. During the maintenance process of the generator, some carbon brushes of the stator collector ring of the unit were severely worn after operation, which did not meet the requirements of the regulations, and the worn carbon brushes needed to be replaced. The contact surfaces of new carbon brushes must be ground before they can be installed and used. In previous overhauls, manual grinding of carbon brushes was often used for grinding. However, the method of manually g...

AI Technical Summary

Problems solved by technology

The disadvantages of the method of using hand-grinding carbon brushes are: 1) The carbon powder after grinding is scattered and cannot be collected centrally, which will affect the operating environment of the unit after maintenance.

2) The hand-grinding carbon brush will have uneven grinding and no radian on the contact surface with the collector ring, which will cause some unfavorable factors, which will increase the wear of the carbon brush and affect the normal operation of the generator

3) The size of the gap between the carbon brush and the brush holder is not well controlled by manual grinding, resulting in no gap or too small gap between the carbon brush and the brush holder, and the carbon brush may be stuck in the brush holder due to thermal expansion

However, manual grinding sometimes fails to meet the corresponding requirements, and there will be insufficient contact area between the carbon brush and the slip ring, which cannot ensure that the carbon brush and the slip ring are always in good contact, which may lead to overheating of the carbon brush due to an increase in electrical loss. The increase of sparks will cause unfavorable factors such as burns, which will increase the wear of carbon brushes and affect the operation of the generator

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