Inclined-plane manhole closing tool for double-cover type steam generator

Abstract

The invention belongs to the technical field of nuclear power, and specifically relates to an inclined-plane manhole closing tool for a double-cover type steam generator. The inclined-plane manhole closing tool for the double-cover type steam generator comprises a centering device, a fixing device and a conversion fixing device, wherein the centering device is independently used, an inner cover of a manhole and the manhole are coaxially aligned and then disassembled, the fixing device and the conversion fixing device are matched for use, the inner cover of the manhole is firstly fixed by using the fixing device, and then the conversion fixing device is used for ensuring disassembly for the fixing device and correct reassembly for an outer cover of the manhole. The inclined-plane manhole closing tool for the double-cover type steam generator has the following beneficial effects: (1) centering for the inner cover of the manhole: fine adjustment for the position of the inner cover of the manhole in a lifting process for the inner cover of the manhole can be realized, so that the inner cover of the manhole is lifted to a specified position; and (2) fixing for the inner cover of the manhole: after the inner cover of the manhole is lifted to the specified position, the inner cover of the manhole is fixed by virtue of a left clamping plate, a right clamping plate and a transition stud.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a tool for closing manholes on inclined planes of double-covered steam generators. Background technique [0002] The secondary side of the steam generator in a nuclear power plant includes a manhole structure. The manhole structure includes a manhole inner cover and a manhole outer cover. The manhole inner cover is supported by a rotating arm. The manhole inner cover can rotate around the rotating arm. The rotating arm Fixed on the inner surface of the head, the rotating arm can rotate around the fixed axis. When the manhole is closed, the inner cover of the manhole is rotated to the position of the manhole by swinging the rotating arm, and the inner cover of the manhole is swung so that the inner cover of the manhole is centered with the manhole. Through the outer cover of the manhole and the fastening bolts, the The inner cover of the manhole is lifted and fi...

AI Technical Summary

Problems solved by technology

However, the rotating shaft and the manhole inner cover in the manhole structure have been inside the steam generator for a long time. During the operation of the equipment, soda water and impurities enter the manhole inner cover and the rotating mechanism of the rotating arm, forming rust, which makes the manhole inner cover It is difficult to move the manhole and the rotating arm. When opening the manhole, additional force is required to forcibly move the manhole inner cover and the rotating arm. This additional force makes the manhole inner cover and the rotation mechanism of the rotating shaft loose. The cover cannot be aligned with the manhole, so the manhole inner cover cannot be lifted to the designated position through the manhole outer cover and manhole bolts, and the manhole cannot be closed smoothly

Images