A driving device for automatic inspection and positioning of safety injection pipes of reactor pressure vessels

Abstract

The invention belongs to a nuclear power station non-destructive testing technology, and particularly discloses an automatic checking, positioning and driving device for a safety injection pipe of a reactor pressure vessel. The device comprises a main movement assembly, a middle supporting assembly, a safe end axial assembly and a safe end checking assembly, wherein the middle supporting assembly, the safe end axial assembly and the safe end checking assembly are sequentially connected with the main movement assembly. The main movement assembly comprises a main movement sleeve, a circumferential movement driving gear, a circumferential movement driven gear, a circumferential motor and an axial motor. The middle supporting assembly comprises a middle supporting sleeve and a middle supporting central spindle; the safe end axial assembly comprises a safe end rear supporting base, a safe end front supporting base, a safe end guide shaft and a safe end screw. The axial motor is designed to drive the main movement assembly and the safe end axial assembly to move in the axial direction. The axial movement range of the main movement assembly is inconsistent with that of the safe end axial assembly so that two movement ends can be different in axial speed through the difference of the main movement screw lead and the safe end screw lead, and the connection pipe supersonic checking requirements and the extra segment supersonic testing requirement are met.

Description

technical field [0001] The invention belongs to the non-destructive detection technology of nuclear power plants, and in particular relates to a driving device for automatic inspection and positioning of safety injection pipes of pressure vessels. Background technique [0002] There are different pipes on the nuclear reactor pressure vessel. According to the requirements of relevant specifications, regular non-destructive testing of the welds of these pipes is required. Since the pipe near the pressure vessel is wrapped with an insulation layer, it is troublesome to dismantle it. At the same time, the dose rate of the external environment is relatively high, so it is difficult to detect from the outside. Therefore, the inspection can be carried out from the inside of the pipe, but the ultrasonic inspection from the inside is divided into contact ultrasonic inspection and water immersion ultrasonic inspection. Since the internal weld seam of some small-diameter pipes is not e...

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Problems solved by technology

Since the pipe near the pressure vessel is wrapped with an insulation layer, it is troublesome to dismantle it. At the same time, the dose rate of the external environment is relatively high, so it is difficult to detect from the outside

Therefore, the inspection can be carried out from the inside of the pipe, but the ultrasonic inspection from the inside is divided into contact ultrasonic inspection and water immersion ultrasonic inspection. Since the internal weld seam of some small-diameter pipes is not easy to clean after welding, the weld left on the inner wall Slag, if contact ultrasonic testing is used, the fit of the probe cannot be guaranteed, which will affect the test results, and the probe holder may be stuck at the same time.

[0003] At present, there are already relevant ultrasonic automatic inspection devices for pipeline water immersion in China, and the number of welds to be inspected is relatively simple.

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