Horizontal steam generator blocking plate bolt protective cover and dismounting tool thereof

Abstract

The invention belongs to the technical field of mechanical devices and transportation, and particularly relates to a horizontal steam generator blocking plate bolt protective cover and a disassembling tool thereof. The protective cover comprises four split type protective covers, and the four split type protective covers are installed in a matched mode and completely cover header pipe blocking plate bolts. According to the disassembling tool, the two ends of first connecting rods and the two ends of second connecting rods are provided with pin controllers, and the two first connecting rods and the two second connecting rods form a self-locking rhombic block through short screw tail cylindrical pins; one corner of the self-locking rhombic block is connected with the bottom of a long rod through the long screw tail cylindrical pin, the other symmetrical corner is connected with one end of the steel wire rope through the short screw tail cylindrical pin, the steel wire rope penetrates into the long rod, a gravity rod is installed on the steel wire rope, and a handle is installed at the other end of the steel wire rope. The header pipe blocking plate bolt of the steam generator is prevented from being damaged, or the defect that the bolt is jammed and seized due to the fact that foreign matter enters the threaded connection position of the blocking plate bolt is overcome, and the influence on a nuclear island overhaul key path is avoided.

Description

technical field [0001] The invention belongs to the technical field of mechanical devices and transportation, and in particular relates to a horizontal steam generator blocking plate bolt protective cover and a disassembly tool thereof. Background technique [0002] The steam generator is one of the important equipments of the nuclear power plant. Its function is to transfer the heat of the coolant in the primary circuit to the feed water in the secondary circuit, so that it can be heated into steam. [0003] During the dismantling and overhaul of a horizontal steam generator in a nuclear power plant, it is necessary to perform eddy current testing on the heat transfer tube of the steam generator. Before the eddy current test, it is necessary to use a special long rod tool to install the blocking plate at the header of the cold and hot ends of the steam generator in the blocking plate groove at the bottom of the header at a depth of 5 meters from the header, so that Ensure ...

AI Technical Summary

Problems solved by technology

[0005] During the eddy current test of the heat transfer tube, the eddy current testing equipment has the risk of knocking against the blocking plate and the plugging plate bolts, and the rust residue, boron crystals and other dirt brought out by the eddy current probe from the heat transfer tube during the eddy current testing process will fall into the collecting tube plug The threaded connection parts of the plate bolts will cause frequent seizures during the removal of the blocking plate bolts

If the bolts of the steam generator blocking plate are seized and cannot be removed smoothly, the removal of the entire blocking plate will be delayed; if the seizure is serious, personnel will need to enter the header to remove the nuts, which will greatly increase the radiation of personnel Dosage and Industrial Safety Risks

When the bolts of the steam generator blocking plate are seized, if the defect cannot be dealt with quickly within a limited time, it will directly affect the progress of the main line

[0006] In view of the above problems, the maintenance personnel tried to use rubber pads and other anti-foreign object tools to protect the bolts of the blocking plate, but because the steam generator header was smaller than the diameter of the blocking plate, foreign objects fell off and fell off during the removal of the rubber pads and other anti-foreign object tools. The threaded connection of the bolts of the blocking plate will cause the phenomenon of bolt seizure, which cannot fundamentally solve the problem of the bolt seizure of the blocking plate

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