Fixing device and application thereof

Abstract

The invention discloses a fixing device used for fixing an electric heating plate during circumferential weld heat treatment of an electric steam generator. The fixing device comprises a support plate component and a plurality of pushing components; the pushing components penetrate the support plate component and has the electric heating plate pressed tightly; each pushing component comprises a sleeve with one end connected with the support plate component, an adjusting cover plate arranged at the other end of the sleeve, a pushing shaft including a first part, a second part, a third part and a fourth part which are connected in sequence, a retaining plate located in the sleeve and arranged at the joint of the first part and the second part of the pushing shaft, a spring arranged in the sleeve, sleeving the pushing shaft and located between the retaining plate and the adjusting cover plate and a hand drawing plate connected with the fourth part of the pushing shaft. By the arrangement that the electric heating plate is in tight contact with the inner wall of a shell, effectiveness in heating is guaranteed, and the fixing device is simple in structure, safe and reliable in fixing mode, and convenient and rapid to disassemble.

Description

technical field [0001] The invention relates to manufacturing equipment for nuclear power steam generators, in particular to a fixing device and its application. Background technique [0002] The partial heat treatment method is adopted for the heat treatment of the upper circular seam of the steam generator of the nuclear equipment vessel. During the partial heat treatment, an electric heating plate is installed on the inner wall of the circular seam, and the outer side of the electric heating plate is wrapped with thermal insulation cotton. In order to prevent the electric heating plate and the insulation cotton from falling off, a fixing device is installed outside the insulation cotton. The fixing device in the prior art is supported and fixed by a plate or a rod connected to the component. When the diameter of the annular gap is large, the expansion of the shell is more obvious when heated, and it is easy to cause the electric heating plate and the shell to swell during...

AI Technical Summary

Problems solved by technology

The fixing device in the prior art is supported and fixed by a plate or a rod connected to the component. When the diameter of the annular gap is large, the expansion of the shell is more obvious when heated, and it is easy to cause the electric heating plate and the shell to swell during the heat treatment process. gap, so that the shell cannot be heated effectively, resulting in loss of control of the heating temperature

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