Bolt assembly process for evaporator sealed cover plate in hydrostatic test

Abstract

The invention relates to a bolt assembly process for an evaporator sealed cover plate in a hydrostatic test. A bolt comprises a head and a screw, wherein the screw comprises a cylindrical sleeve with an external thread and a mandrel arranged in the sleeve, and one end of the mandrel is connected with the head. The assembly process comprises a calculating step and an assembly step. In the assemblyprocess in the invention, the pre-tightening force is conversed to the surplus elongation according to the material characteristics of the bolt material and a hydraulic tensioner is used for tightening the bolt, whether the bolt is tightened or not is judged by directly checking whether the final elongation of the bolt when the bolt is tightened is in the range of presupposed surplus elongation, thereby realizing the reliable installation of the bolt on the sealed cover plate. By using the bolt assembly process provided by the invention, the bolt is relatively uniformly stressed, and in addition, the hydraulic tensioner and a bolt measuring device are used for measuring the bolt elongation in any state, thereby ensuring the veracity of screwing the bolt.

Description

technical field [0001] The invention relates to a mechanical assembly process, in particular to a bolt assembly process for an evaporator sealing cover plate in a hydraulic test. Background technique [0002] As we all know, general bolt tightening can be achieved by manual or torque wrench direct tightening and other methods, but in the evaporator hydrostatic test, the bolt pre-tightening force of the evaporator sealing cover plate is relatively large, so the bolts cannot be directly tightened by hand. In addition, The assessment requirements for bolt tightening are mainly the pre-tightening force when the bolt is tightened, and the pre-tightening force is inconvenient to measure and control directly. It can be seen that the above-mentioned traditional bolt assembly method has disadvantages such as uneven force on the bolt and poor control of the tightening force. Therefore, there is an urgent need to improve the assembly process of the evaporator sealing cover plate in the...

AI Technical Summary

Problems solved by technology

[0002] As we all know, general bolt tightening can be achieved by manual or torque wrench direct tightening and other methods, but in the evaporator hydrostatic test, the bolt pre-tightening force of the evaporator sealing cover plate is relatively large, so the bolts cannot be directly tightened by hand. In addition, The assessment requirements for bolt tightening are mainly the pre-tightening force when the bolt is tightened, and the pre-tightening force is inconvenient to measure and control directly. It can be seen that the above-mentioned traditional bolt assembly method has disadvantages such as uneven force on the bolt and poor control of the tightening force. Therefore, there is an urgent need to improve the assembly process of the evaporator sealing cover in the hydrostatic test.

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