Clamping forceps with swingable jaws

Abstract

The invention discloses clamping forceps with swingable jaws. The clamping forceps comprise a combined hydraulic cylinder, a left arm frame and a right arm frame, wherein the front ends of the left arm frame and right arm frame are provided with jaw holder assemblies, each jaw holder assembly is internally provided with two groups of jaw seats and the jaws, the jaw seats are of triangular-prism-shaped structures, the triangular tails of the jaw seats are hinged into the jaw holder assemblies through pin shafts, the pin shafts are coaxial with rollers in roller forceps on lifting arms of a tubedrawbench to ensure that the jaws are coaxial with a drilling tool clamped by the roller forceps after the jaws clamp the drilling tool; the front end faces of the jaw seats are provided with groovesused for mounting jaws, and the clamping edges of the jaws are of arc-shaped structures. The clamping forceps with the swingable jaws have the advantages that when the clamping forceps are in use, the drilling tool is enclosed by the four jaw assemblies of the clamping forceps, the jaws can swing along with the pin shafts under the combined action of the clamping force and drilling tool, when thedistance between the rotating centers of the jaws and the centers of the drilling tools is the smallest, the four jaws stops swinging under the action of the clamping force, and clamping of the drilling tool is achieved through four-point positioning.

Description

technical field [0001] The invention relates to the technical field of oil drilling equipment, in particular to a clamping pliers with swingable teeth. Background technique [0002] The chuck of the lifting arm of the pipe racking machine used for oil drilling is mainly composed of three types of tongs, namely safety tongs, roller tongs and clamping tongs. The three sets of tongs are usually driven by a combined hydraulic cylinder through a connecting rod mechanism. The safety gear is used to protect the drilling tool from toppling over. The roller pliers are used for the centering and positioning of the drilling tool. When grabbing the drilling tool, the four rotating rollers in the same plane and the drilling tool circumscribe it to position it. The clamping tong is the core part in the lifting arm jaw, which is used to clamp the drilling tool and bears the weight of all the drilling tool. [0003] At the drilling site, the vertical roots of drilling tools are neatly arr...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a swingable clamping pliers for the lifting arm of the pipe rowing machine, so as to solve the problem that the teeth of the clamping pliers in the lifting arm of the pipe rowing machine in the prior art are prone to wear and tear at the position where the force is in contact with the drilling tool , hold on to poor performance

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