Grinding device for inner wall of large shaft central hole of power generator unit

Abstract

The invention relates to a grinding device for an inner wall of a large shaft central hole of a power generator unit. The grinding device comprises a handheld device round bar, wherein a fixed retainer ring is fixedly installed on the right side end part of the round bar, the round bar at the left side of the fixed retainer ring is sleeved by a hard sponge sleeve, a layer of grinding abrasive paper is fixedly installed on the outer side of the circumference of the hard sponge sleeve, a fixed stop ring sleeves the round bar at the left side of the hard sponge sleeve, and the fixed stop ring is fixed by a clamping hoop at the outer side of the circumference of the fixed stop ring. The grinding abrasive paper elastically contacts with the inner wall of the central hole, the elastic contact is different from the rigid contact between the traditional mechanical grinding block and the inner wall of the central hole, the abrasive paper in different fineness degree can be replaced at any time, the grinding effect can be guaranteed, the grinding efficiency can be improved, and the good coupling of an ultrasonic probe is guaranteed, so that accuracy in ultrasonic flaw detection can be realized, and leak detection can be avoided.

Description

technical field [0001] The invention belongs to the technical field of processing electric equipment in an electric power system, in particular to a grinding device for the inner wall of a central hole of a large shaft of a generating set. Background technique [0002] At present, ultrasonic flaw detection is required for each overhaul of the central hole of the large shaft of the thermal power generation unit, steam turbine, and generator. The ultrasonic flaw detection of the central hole is one of the main inspection items for the regular inspection of boiler generator sets. [0003] Ultrasonic flaw detection has requirements for the roughness of the inner wall (not greater than 1.6 microns) to ensure that the ultrasonic probe is well coupled, so that the ultrasonic flaw detection is accurate and does not miss inspection. The traditional method of grinding the inner wall is time-consuming and laborious, the equipment is heavy and difficult to transport and assemble, the de...

AI Technical Summary

Problems solved by technology

The traditional method of grinding the inner wall is time-consuming and laborious, the equipment is heavy, it is not easy to transport and assemble, the device is expensive, more than 3 people are needed manually, and the grinding effect is not good

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