An anti-pinch oilfield pipe power tongs

Abstract

The invention relates to a pair of power tongs for preventing an oil field pipe from being clamped to be flat. The pair of power tongs comprises a tong head gear assembly, a tong head brake mechanism, a tong head clamping mechanism and a limit pin, wherein a limit groove is formed in the circumference of the end face rotating around the axis of the tong head gear assembly, the limit pin is arranged on the circumference of the tong head brake mechanism, the circumference of the tong head brake mechanism is the same as the circumference of the tong head gear assembly, and one end of the limit pin extends into the limit groove. By means of the limit pin on the tong head brake mechanism and the limit groove in the tong head gear assembly, the tong head brake mechanism can only perform relative rotation in the set rotation angle of the tong head gear assembly, a clamping claw in the tong head clamping mechanism performs climbing in the set extending stroke, therefore, the amount of the clamping claw clamped into the outer wall of a tubular column can be controlled, the tubular column cannot be clamped to be flat within an elastic deformation range, and damage to the power tongs caused by the fact that the power tongs go beyond the largest clamping range is avoided. The pair of power tongs has the advantages of being reasonable in design, simple in structure, remarkable in effect in preventing the oil field pipe from being clamped to be flat and safe and reliable.

Description

technical field [0001] The invention relates to a power tong for oilfield pipes, in particular to a protective structure for preventing the power tongs for oilfield pipes from pinching a pipe string, and belongs to the technical field of petroleum equipment design and manufacture. Background technique [0002] Power tongs for oilfield tubing are used in threading and breaking operations of tubing, casing, and drill pipe. The clamping method of traditional power tongs for oilfield pipes is mostly through two translational jaws or swinging jaws to clamp or double-team the oil pipes. In addition, planetary jaws are also used for clamping. However, regardless of the clamping method, the working principle is basically the same, that is, through the lift in the eccentric cam clamping mechanism, the pushing jaw moves to the center of the pipe string and clamps the pipe string, and then drives the pipe string to rotate together to achieve Make up or shackle. During the above proce...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-pinching power tongs for oilfield pipes, which solves the problem that the traditional power tongs for oilfield pipes are often pinched due to over-torque use or pipe wall thinning by setting the limit of the position where the jaws snap into the pipe string question

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