New unscrewing pliers for drill pipe

Abstract

The invention discloses a novel unscrewing tong for a drill stem. The novel unscrewing tong comprises a movable jaw and a fixed jaw. An inner jaw part of the movable jaw comprises an engagement end face designed into a plane and an inner clamping face designed into an arc-shaped concave surface. The plane where an opening of the inner clamping face is located forms an included angle being 65-80 degrees with the engagement end face. The rear end of the movable jaw is hinged to the fixed jaw. The fixed jaw comprises a tong head and tong arms on the two sides. The tong head is fixedly clamped between the two tong arms. The rear end of the movable jaw is hinged between the two tong arms through a pin shaft. A mounting block is arranged between the two tong arms. A spring piece is fixedly mounted on the mounting block. The rear end of the movable jaw is provided with an arc-shaped convex surface. When the movable jaw rotates around the pin shaft, the arc-shaped convex surface at the rear end of the movably jaw makes contact with the spring piece to bend or unfold the spring piece. The novel unscrewing tong for the drill stem is wide in application range and high in operability and is expected to completely replace traditional chain tongs and pipe tongs in the near future.

Description

technical field [0001] The invention relates to a rod unscrewing device, in particular to a rod unscrewing pliers. Background technique [0002] In the prior art, a wrench is a very versatile installation and removal tool. Its principle is to use the principle of leverage to turn bolts, screws, nuts and other threaded fastening bolts or socket fasteners. The wrench is usually made with clamping jaws at one or both ends of the handle. When in use, an external force is applied to the handle along the thread rotation direction to twist the bolt or nut. [0003] According to whether the jaws can move, wrenches can be divided into dead wrenches and live wrenches. An adjustable wrench, also known as a network wrench, is a tool for tightening or loosening angled screws or nuts. Commonly used are 200mm, 250mm and 300mm, which should be selected according to the size of the nut when used. Dead wrenches mainly include Allen wrench (Inner hexagon), Phillips screwdriver (Phillips sc...

AI Technical Summary

Problems solved by technology

[0004] At the same time, the current manual working tongs such as pipe tongs and chain tongs used in geological drilling are bulky and have poor unscrewing effects. There is an urgent need for a light, easy-to-use pipe tong that can adapt to a certain caliber (￠50-￠130mm)

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