Internal automated flaw detection system for nuclear power rectangular variable cross-section pipelines

Abstract

The invention discloses a nuclear power rectangular variable-section pipeline internal automatic flaw detection system. The system comprises a cloth piece part, a positioning system, a driving part and a supporting part, wherein the supporting part is used for providing the friction force for driving wheels; the supporting part comprises a fixed supporting rod and a sliding supporting rod, whereinthe fixed supporting rod and the sliding supporting rod are arranged on a mounting plate, and the middle of the fixed supporting rod is rotationally connected with the middle of the fixed supportingrod; the lower end of the fixed supporting rod is rotationally connected to the mounting plate; the lower end of the sliding supporting rod is movably connected to the mounting plate, so that the sliding supporting rod can slide, and the included angle between the sliding supporting rod and the mounting plate can be changed; and the supporting part further comprises a rotating power assembly usedfor driving the sliding supporting rod to rotate. A longitudinal cloth mechanism and a transverse cloth mechanism are arranged on the mounting plate, one device can meet the requirements of two clothpieces at the same time, the position of the cloth piece can be accurately positioned, meanwhile the piece pressing effect is good, so that the detection effect is guaranteed, a supporting air cylinder is arranged in the mounting plate in a penetrating mode, the overall height of the system can be greatly reduced, so that the size of a detection window can be adapted, and the change of detection space can be met.

Description

technical field [0001] The invention relates to the field of nuclear power detection equipment, in particular to an internal automatic flaw detection system for nuclear power rectangular variable-section pipelines. Background technique [0002] The longitudinal section of nuclear power rectangular variable cross-section pipeline is as follows: figure 1 As shown, it is a double-layer D-shaped section, and its transverse section is as follows figure 2 As shown, it is composed of outer shell, inner shell, ribs and compensation ring. The material is all stainless steel 316L. The distance between the inner shell and the outer shell is between 180 and 280mm. As the curvature changes, the distance between the two ribs is 300mm, the width of the compensation ring is 200mm and the thickness is 50mm. It is welded with the inner shell to form two longitudinal welds Ⅰ and Ⅱ. The compensation ring itself is also welded by multiple plates to form a transverse weld Ⅲ. In the enclosed sp...

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Problems solved by technology

Due to structural constraints, these three welds can only be welded from the outside of the inner shell to the side of the closed space, resulting in the uneven surface of the welds on the side of the closed space that cannot be processed

At present, there is no device specially used for internal flaw detection of nuclear power rectangular variable cross-section pipelines. Due to the special shape of the closed space, the existing pipeline crawling robots cannot be applied to the internal flaw detection of nuclear power rectangular variable cross-section pipelines. The flatness of the wall surface is high, and it cannot adapt to the uneven working environment of the weld surface. The magnetic wheel crawler robot requires the inspection object to be ferromagnetic material, which cannot be used for non-ferromagnetic materials such as stainless steel, and cannot meet the requirements of nuclear power rectangular variable cross-section pipes. Requirements for internal flaw detection testing

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