Seal weld surfacing maintenance device

Abstract

The invention provides a seal weld surfacing maintenance device. The seal weld surfacing maintenance device comprises a mounting base with a containing inner cavity, a clamping mechanism, a rotating mechanism and a welding module. A mounting through groove which is vertically through and is used for allowing a seal weld carrier to penetrate into is formed in the mounting base. The mounting base isprovided with a rotating mechanism fixing plate located at the lower end of the containing inner cavity. The clamping mechanism is arranged in the containing inner cavity of the mounting base and provided with two symmetrically-arranged clamping stirrups, and the two clamping stirrups can oppositely move in the radial direction of the seal weld carrier so as to fix the mounting base to the periphery of the seal weld carrier. The rotating mechanism is installed on the lower end face of the rotating mechanism fixing plate and provided with a welding motion fixing plate capable of rotating in the circumferential direction of the seal weld carrier. The welding module is installed on the welding motion fixing plate and provided with a welding assembly and a wire feeding nozzle assembly. By means of the seal weld surfacing maintenance device, the automatic surfacing operation can be achieved, operation is simple, the mounting time is short, the surfacing maintenance time is shortened, and the seal weld maintenance operation cost is greatly reduced.

Description

technical field [0001] The invention relates to the fields of welding, surfacing and maintenance of sealing welds, in particular to a sealing welding surfacing maintenance device for a control rod drive mechanism (CRDM) of a nuclear power plant. Background technique [0002] The control rod drive mechanism (hereinafter referred to as CRDM) is the servo mechanism of the reactor control and safety protection system. Its function is to drive the control rod assembly to move up and down in the core according to the instructions of the reactor control and protection system, and to keep the control rod assembly in the reactor core. The safety and reliability of reactor start-up, power adjustment, power maintenance, safety shutdown and emergency shutdown are completed by command height or power failure and rod drop, which directly affect the safety and operation of the reactor. There are multiple control rod drive mechanisms distributed on the top cover of the reactor pressure vess...

AI Technical Summary

Problems solved by technology

The maintenance surfacing welding technology in the United States is the overall surfacing welding on the basis of retaining the original CRDM components and their sealed welds. Compared with the French CRDM overall replacement technology, it has good technical reliability, relatively short maintenance cycle, and relatively good economy , but the structure of the maintenance equipment in this technology is complex, the size is large, the process control is cumbersome, and the maintenance cost is extremely high

At present, when such leakage failures of sealing welds occur in China, the maintenance of sealing welds is highly dependent on foreign imports. Not only is the cost quite expensive, but also the maintenance cycle is long, which seriously affects the operating efficiency of nuclear power plants.

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