Adjusting tool for welding main pump casing of nuclear steam generator

Abstract

The invention discloses an adjusting tool for welding a main pump casing of a nuclear steam generator. The adjusting tool comprises an adjusting bracket and a welding support, wherein the adjusting bracket embraces and fixes the pump casing, so as to lift and overturn the pump casing conveniently. The adjusting bracket comprises an upper beam and a lower base, wherein the upper beam is arranged at the top of the pump casing; the lower base is arranged at the bottom of the pump casing; and the upper beam is connected with the lower base to form a frame so as to embrace the pump casing. The welding support is located at the position of a welding station, and the adjusting bracket is fixedly connected with the welding support. The position of the pump casing in the X-direction, the Y-direction and the Z-direction is adjusted through the welding support; and the circumferential fine adjustment of the pump casing is achieved through the matching of the welding support and the adjusting bracket. The adjusting tool has the advantages that through the tool, the partial fine adjustment of the pump casing in the X-direction, the Y-direction, the Z-direction and the circumferential direction can be achieved, and the lifting and overturning of the pump casing are facilitated so that the assembly accuracy requirements are met better.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to an adjustment tool for welding the casing of a main pump of a nuclear steam generator. Background technique [0002] The cooling main pump casing (RCP) of the steam generator needs to be assembled and welded after the hydrostatic test of the steam generator. The main pump of the third-generation nuclear steam generator weighs about 16 tons and is 1.7 meters long. A pair of outlet pipes are respectively assembled and welded with the main pump casing. The welding accuracy requires that the angle deviation between the main pump casing and the steam generator must be controlled within 0.1°, and the limit position must meet ∥3.2A. In order to meet this requirement , during the whole welding process, the pump casing and steam generator need to use the laser tracker to provide data monitoring and feedback the welding deformation of the pump casing during the welding proces...

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Problems solved by technology

[0003] In the prior art, after the manufacture of the steam generator is completed, the following method is usually used for the assembly and welding of the main pump casing. First, the steam generator is positioned at the welding station, and then the pump casing is positioned at the welding position through the welding bracket tooling. Station, adjust the axial, height and circumferential direction of the pump casing through in-position tooling to ensure that the welding position requirements are met; since the main pump pump casing is a stainless steel casting with complex and irregular shapes, its weight is heavy, It is inconvenient to move up, down, left, right, back and forth, which leads to the unsatisfactory effect of using the in-position tooling to adjust the precision. Therefore, such an assembly tooling is required, which must be able to carry out the pump casing in the three directions of X, Y, Z and the circumferential direction. Local fine-tuning and convenient lifting and turning of the pump casing to better meet the accuracy requirements of assembly

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