A new type of double oblique wedge inner hole expansion and tightening device

Abstract

The invention provides a novel double-wedge inner hole expansion device. The device comprises a cylinder and a clamping jaw; the cylinder is a double-piston cylinder; the top end of a piston rod in a piston B at the lower part of the cylinder penetrates through the top of the cylinder; upper and lower outwards projected conical surfaces are axially arranged at the top end of the piston rod; the clamping jaw includes a basal body and extension and contraction blocks; the basal body is a hollow column; the bottom of the basal body is fixedly connected with a piston A at the upper part in the cylinder; the outer periphery of each extension and contraction block is arc-shaped; convex blocks matched with the upper and lower outwards projected conical surfaces at the top end of the piston rod are arranged on the inner ring of each extension and contraction block; and windows for allowing the convex blocks in the extension and contraction blocks to penetrate through are peripherally formed in the upper part of the basal body. The device is simple in structure and reliable in clamping; and the extension and contraction blocks are matched with the upper and lower conical surfaces of the piston rod to enable the arc-shaped outer surfaces of the extension and contraction blocks to be always parallel to the generatrix of an inner hole of a pipe, so that the extension and contraction blocks and the wall of the inner hole of the pipe are in surface contact, the contact area is increased, the damage to the inner wall of the pipe is reduced, the friction force is increased, and the grabbing reliability is improved.

Description

technical field [0001] The invention relates to a gripping mechanism of a tube-sheet crawling robot, in particular to a device for realizing inner hole expansion with a double-wedge structure. Background technique [0002] At present, most of the tube-sheet crawling robots adopt the method of grasping and positioning the inner hole, and most of the grasping structures of the inner hole adopt the single wedge expansion method. Because the inner hole of the tube plate is a round hole and the tube wall is thin, the single oblique wedge cannot reliably adapt to the inner wall, and will cause deformation and damage to the inner wall of the tube due to uneven force, and the jaws in the single wedge structure are multi-lobe elastic When the claw is used, the life of multiple cycles of stress during work is short. Therefore, it is necessary to provide an inner hole positioning and tightening device with simple structure and reliable clamping, so as to overcome the above-mentioned d...

AI Technical Summary

Problems solved by technology

Because the inner hole of the tube plate is a round hole and the tube wall is thin, the single oblique wedge cannot reliably adapt to the inner wall, and will cause deformation and damage to the inner wall of the tube due to uneven force, and the jaws in the single wedge structure are multi-lobe elastic When the claw is used, the stress life of multiple cycles during work is short

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