Inner hole positioning device, positioning method and crawling mechanism

Abstract

The invention discloses an inner hole positioning device, an inner hole positioning method and a climbing mechanism. A lower air cylinder is arranged in an upper air cylinder, a cylinder cover of thelower air cylinder is connected to a piston rod of the upper air cylinder, a first upper cavity is formed in the top of the piston rod of the upper air cylinder, a first lower cavity is formed in thebottom of the piston rod of the upper air cylinder, a second upper cavity is formed in the top of a piston rod of the lower air cylinder, a second lower cavity is formed in the bottom of the piston rod of the lower air cylinder, and the first upper cavity, the first lower cavity, the second upper cavity and the second lower cavity are separately connected to an inflating pipeline through air via ports; a paw core penetrates through a through hole in the middle of the piston rod of the upper air cylinder, the bottom of the paw core is connected to the cylinder cover of the lower air cylinder, slide blocks sliding axially are arranged on the outer wall of the paw core, reversed L-shaped grooves are formed in the bottoms of the slide blocks, bumps equal to the slide blocks in quantity are arranged on the top of the piston rod of the lower air cylinder, and the dimensions of the bumps fit the reversed L-shaped grooves. The inner hole positioning device provided by the invention is reliablein structure and stable to position an inner hole, prevents positioning failure, is light in weight and large in bearing capacity, and monitors the positioning state in real time.

Description

technical field [0001] The invention belongs to the field of hole positioning technology, and relates to an inner hole positioning device, a positioning method and a crawling mechanism, which are used for steam generator detection and tube plate fixing, positioning in the machining production process, quick clamping and positioning of an automatic production line, and the like. Background technique [0002] The steam generator tube sheet is an important part of the pressure boundary of the primary circuit of a nuclear power plant, and is the main barrier to prevent the leakage of radioactive fission products. Therefore, the inspection of the steam generator tube sheet is a mandatory inspection item for pre-service and in-service inspections of nuclear power plants. At present, the detection devices of steam generators used in various countries are different, but most of them use positioning devices to fix the detection devices on the tube sheet. This requires that the positi...

AI Technical Summary

Problems solved by technology

With the development of detection devices, the carrying capacity of existing positioning devices is insufficient, and there is an urgent need for a positioning device with large carrying capacity, reliable structure and light weight

Since the inner hole of the tube sheet is a round hole, the currently used positioning device cannot reliably adapt to the inner hole of the tube sheet, resulting in uneven stress on the inner hole and damage; Air pressure, under the action of the spring reaction force, the claws will directly collide with the tube sheet, resulting in damage to the positioning device and the tube sheet; there is a large amount of debris accumulation in the inner hole of the tube sheet, which will increase the great resistance during the insertion process of the positioning device , it is difficult to use the spring to make the positioning device reach the designated position; after positioning, if the external air source is lost, the positioning device cannot be removed from the tube plate; and the existing positioning device does not have the real-time monitoring function for the status of the positioning device. There are huge hidden dangers in the process; the existing positioning device opens the air port in the cylinder, so the thickness of the cylinder cannot be reduced, and the weight cannot be reduced, which has great restrictions on improving the load capacity of the positioning device; Use a slender tie rod to connect with the slider. In actual use, it is very easy to cause the positioning device to fail due to structural breakage or poor movement.

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