Wrench special for nuts of main heat transfer pipe support post of heavy water reactor

Abstract

The invention relates to a wrench special for an upper nut and a lower nut of a main heat transfer pipe support post. The wrench is used for overhauling heavy water reactor nuclear power equipment. The wrench comprises a driving system and further comprises a rotary sleeve transmission system and a slide type pull rod device, wherein the rotary sleeve transmission system, the slide type pull rod device and the driving system are sequentially connected. The rotary sleeve transmission system comprises a tank body, a rotary worm gear sleeve, two worm bevel gear shafts, a first universal coupling section and a connection shaft, wherein a worm gear thread is arranged on the outer wall of the rotary worm gear sleeve, the two worm bevel gear shafts are arranged in the tank body, a bevel gear is arranged at one end of each worm bevel gear shaft, the bevel gears are meshed with the two worm bevel gear shaft, screw threads are arranged on the outer walls of the two worm bevel gear shafts, the screw threads are meshed with the worm gear thread, the end, where the bevel gear is arranged, of any one of the two worm bevel gear shafts is connected with the connection shaft through the first universal coupling section, and the connection is in clearance fit with the tank body. The wrench is reliable in running, convenient to operate and high in safety.

Description

technical field [0001] The invention relates to a special wrench for a main heat transfer pipe support and hanger of a nuclear power plant, in particular to a special wrench for fixing, adjusting, and constant torque fastening of the upper and lower nuts of the main heat transfer pipe support and hanger of a heavy water reactor nuclear power equipment maintenance. Background technique [0002] The main heat transfer pipe supports and hangers of the nuclear power plant are located in the nuclear radiation area, and about 240 supports and hangers are densely arranged within a range of 6m in width and 1.5m in depth. The upper and lower nuts that fix the hanger during work will loosen due to vibration, temperature, stress and other factors. At present, the power plant uses conventional (various) wrenches to adjust and lock the nuts for personnel to enter the area, especially for the nuts at a depth of 1.5m in the rear row; however, it is difficult for personnel to enter the area...

AI Technical Summary

Problems solved by technology

At present, the power plant uses conventional (various) wrenches to adjust and lock the nuts for personnel to enter the area, especially for the nuts at a depth of 1.5m in the rear row; however, it is difficult for personnel to enter the area and operate in the dense support and hanger matrix. Long operation time, low efficiency, large radiation dose

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