Overall expansion-joint device for fuel assembly skeleton

Abstract

The invention belongs to an expansion-joint device, and specifically relates to an overall expansion-joint device for a fuel assembly skeleton. The overall expansion-joint device for the fuel assembly skeleton comprises an expansion-joint assembly, a lifting assembly, a support and a location assembly, wherein the support is located at the bottommost end and supports the whole expansion-joint device; the lifting assembly is arranged on the support and capable of lifting and driving the expansion-joint assembly and the location assembly to lift together; the location assembly is arranged at the foremost end of the lifting assembly and used for locating a position to be subjected to expansion joint; and the expansion-joint assembly is further arranged on the lifting assembly and comprises a plurality of expansion-joint pipes, and each expansion-joint pipe is capable of independently completing one-process expansion joint. The overall expansion-joint device for the fuel assembly skeleton has the following remarkable effects: 700 and more groups of overall expansion joint is carried out through applying a new process of overall expansion joint for a guide pipe and a sleeve pipe of the skeleton, the dimensions of an expansion-joint specimen and stretching inspections are both qualified, planeness inspections on the sleeve-pipe end of the skeleton product are all qualified (the planeness is required to be not greater than 0.15mm), and the value of an expansion-joint stretching force is high (the value is required to be greater than 4500N).

Description

technical field [0001] The invention belongs to an expansion joint device, in particular to an integral expansion joint device of a fuel component skeleton. Background technique [0002] Fuel assembly framework expansion is a key process in the manufacture of AFA3G fuel framework. Its purpose is to firmly connect the casing to the framework guide tube, serving as a "bridge" between the framework and the upper pipe seat of the assembly. Skeleton expansion (as indicated figure 1 ) is to move to the right through the tapered expansion rod, the expansion sleeve is opened, and a large enough radial expansion force is generated to cause plastic deformation of the guide tube and the sleeve tube, so that the two are tightly combined to complete the skeleton expansion work. [0003] At present, most domestic fuel assembly skeletons adopt the method of single expansion joint, and the expansion joint work is completed by manually using a single expansion gun to pair 24 guide tubes and...

AI Technical Summary

Problems solved by technology

Its production efficiency is not high, the human error is large, and the operation is cumbersome

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