Clamping mechanism

Abstract

The invention discloses a clamping mechanism which comprises a shell and an oil cylinder installed in the shell, wherein clamping blocks are distributed in the front part of the shell in bilateral symmetry; and the inner side surfaces of the front half parts of the clamping blocks are inner concave surfaces. The clamping mechanism is characterized in that a cylinder barrel of the oil cylinder is centered at the rear part of the shell; the front end of a piston rod of the oil cylinder is articulated with a connecting plate; the left part and the right part of the connecting plate are respectively articulated with the rear ends of the clamping blocks; the front part of at least one cover plate of the shell is symmetrically provided with guide grooves left and right; guide pins are arranged in the middle parts of the two clamping blocks and inserted into the guide grooves; fixed blocks are clamped and fixed in the middle parts of the front ends of the two cover plates, and the normal line of the surfaces of the front parts of the inner concave surfaces of the two clamping blocks are inclined to the directions of the fixed blocks. The invention has simple structure, high strength and large clamping force and can be suitable for different pipe columns with the external diameter range of 3.5-9.75 inches without replacing the clamping mechanism, and the clamping mechanism can not interfere with the adjacent pipe column during working.

Description

Technical field [0001] The invention belongs to an automatic machine tool of oil drilling equipment, and particularly relates to a clamping mechanism of a standing discharge manipulator. Background technique [0002] Drill pipe discharge automation and site pipe arranging and transporting systems are one of the key technologies for rig automation. The standpipe discharge manipulator is an important component of the drill pipe discharge automation mechanism and the field pipe and pipe transportation system. Its main functions are: 1) Move the connected standpipe (three single pipe strings are called standpipes) to Refer to the designated position on the beam frame; 2) When drilling, send the stand root at the designated position on the finger beam stand to the centerline of the wellbore; 3) When starting the drill, send the stand root from the center line of the wellbore to the finger beam stand Designated location on the. [0003] The working conditions of the stand root discharg...

AI Technical Summary

Problems solved by technology

However, this kind of clamping mechanism has the following problems in use: since the clamping block with a curved surface is opened and then closed, the clamping is realized by surrounding the pipe string with the curved surface, and the curved surface of the clamping block is fixed, so it can only clamp When holding a string with a smaller size range, when the clamping range is exceeded, the entire clamping mechanism can only be replaced, which is quite troublesome

This kind of clamping method also has problems that need to be improved: the curved surface of the clamping block surrounds the pipe string, and the curved surface is suitable for a narrow range of pipe diameters, and the same clamping mechanism cannot clamp pipe strings within a larger outer diameter range, such as The above-mentioned 3.5-9.75 inches (88.9mm-247.7mm); since the clamping block rotates around the fulcrum at the rear, when the clamping block is opened and closed, its front part has a larger range of motion in the width direction. When the small-diameter pipe string is used, the clamping block easily interferes with the adjacent pipe string to be clamped; the rotation fulcrum of the clamping block is at the rear, and the cantilever of the clamping block is long, which easily causes insufficient clamping force , not strong enough

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