Automatic inspection device for bolt holes on reactor pressure vessel

Abstract

The invention provides an automatic detection device for bolt holes on a reactor pressure vessel, which includes a frame on which a first positioning structure, a second positioning structure, a scanning mechanism, a driving mechanism and a plurality of traveling wheels are installed; The first positioning structure includes a first arc-shaped guide rail and a second arc-shaped guide rail arranged in parallel in the horizontal direction, and the first arc-shaped guide rail and the second arc-shaped guide rail can perform a clamping action close to each other; The second positioning structure is located between the first arc-shaped guide rail and the second arc-shaped guide rail, the second positioning structure includes a base that can move up and down, and the base is provided with symmetrically arranged first stops and The second block; the drive mechanism is used to drive the road wheels. The invention can realize the automatic detection of the bolt holes on the flange surface by the scanning probe, can complete the detection of all the bolt holes after one installation, and improves the detection efficiency.

Description

technical field [0001] The invention relates to a detection device in the field of nuclear power, in particular to a detection device for bolt holes on a flange surface of a reactor pressure vessel. Background technique [0002] In a nuclear power plant, the reactor pressure vessel and the pressure vessel top cover are connected by bolts. The flange surface of the pressure vessel is machined with bolt holes in the circumferential direction. The bolt holes are used for the connection and cooperation with the main bolts. These bolt holes work under high temperature and pressure for a long time. , In a strong radiation environment, and in the operation of the nuclear power plant, it is accompanied by multiple tensile disassembly and assembly, so it is easy to cause damage, which will cause crack expansion, affect the bolt connection effect, and seriously lead to thread breakage and pressure vessel damage, causing nuclear safety accident. According to industry regulations, it i...

AI Technical Summary

Problems solved by technology

[0003] (1) Since the position of the inner wall of the clamped pressure vessel is the sealing surface of the pressure vessel, there is a risk of damaging the sealing surface

[0004] (2) The camera mounted on the flange surface cannot clearly observe the tightness of the inner and outer guide plates clamping the inner and outer walls of the pressure vessel and the movement of the guide plates; at the same time, the outer guide plate of the existing device is attached to the outer wall of the pressure vessel. During the movement, it is limited by the 0° and 180° guide pins, so it cannot pass through continuously, and the equipment has three vertical support wheels that are supported on the support steps in the pressure vessel. Affected by the positioning groove, the vertical support wheel cannot pass through the positioning groove smoothly, resulting in an unreachable area for detection

[0005] (3) The peripheral positioning of the equipment adopts the flat-shaped laser mounted on the laser camera assembly to emit a flat-shaped laser, and then adjusts the circumferential position by observing the positional relationship between the flat-shaped laser and the bolt hole cover through video. The lower laser emission is affected by strong radiation, and its stability is easily disturbed; in addition, the circumferential position is judged by observing the position of the inline laser and the bolt hole cover through video, and the human judgment error is large, and the position accuracy cannot be guaranteed

[0006] Based on the above, the existing detection equipment has a low degree of automation, and the device structure has limitations, so it is impossible to achieve global automation

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