Entire bolt stretcher for nuclear reactor pressure vessels and operating process thereof

Abstract

The invention discloses an entire bolt stretcher for nuclear reactor pressure vessels comprising a supporting ring, a lifting device, a supporting device, stretching component, a robot operating platform and a main bolt rotary robot. The supporting ring bears a reactor cover; the stretching component comprises a stretching hydraulic cylinder, a stretching bridge, a stretching nut, a stretching nut rotating device and a cover nut rotating device; the stretching cylinder is fixed to the supporting ring, the stretching bridge bears the piston of the stretching cylinder, the stretching unit is connected with a main bolt in a screwed manner, the stretching nut rotating device drives the stretching nut to rotate, the cover nut rotating device drives a cover nut to rotate, the lifting device drives the supporting ring to move upwardly, the supporting device supports the supporting ring, and the main bolt rotary robot is arranged on the robot operating platform and rotates the main bolt. The entire bolt stretcher is capable of screwing the main bolt in or out of a bolt hole in the pressure vessel and stretching the main bole so as to screwing the cover nut tightly or loosely, the operating efficiency is high, and disassembling time is saved.

Description

technical field [0001] The invention relates to a bolt tensioning machine, in particular to an integral bolt tensioning machine for fastening and dismantling the main bolts of the large cover of the reactor pressure vessel of a nuclear power plant and its operating process. Background technique [0002] Pressure vessels used in industrial fields such as shipbuilding, petrochemical, electric power, nuclear power, metallurgy, bridges, railways, and heavy machinery are generally tightly connected to the reactor cover by main bolts. Tightening force, the pre-tightening force of multiple main bolts on the pressure vessel is required to be uniform and controlled within a certain range, but the purpose of making the pre-tightening force consistent cannot be achieved by manually using a wrench to tighten the main bolts. In addition, the main bolts used in these fields are often large bolts, which are difficult to operate by manpower, and special devices are required to fasten and di...

AI Technical Summary

Problems solved by technology

[0004] However, the bolt tensioner in the prior art can only stretch the main bolt and tighten or loosen the nut, and cannot screw the main bolt in before tightening or unscrew the main bolt after loosening The through hole on the reactor cover and the bolt hole on the pressure vessel, so other devices are needed to realize the screwing in and out of the main bolt in the through hole and the bolt hole, and various devices are installed and used alternately on the reactor cover , which makes the operation more complicated and takes longer

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