Production process of hydraulic power backup tongs for oil pipe

Abstract

The invention relates to a production technology of hydraulic power backup tongs for an oil pipe, in particular to multi-die direct drive type hydraulic power backup tongs for a clamped oil pipe, belonging to a mechanical manufacturing technology. The acting force of a hydraulic cylinder is directly acted on a clamped pipe column by using a sliding pair between a translational tong die assembly and a backup tong main body; meanwhile, rectilinear motion of a hydraulic cylinder body or a piston rod is transformed into rotating motion of a clamping arm by a fixed hinge form of two rotary pairs between the hydraulic cylinder and a rotary tong die assembly and a moving hinge form between the two rotary pairs, so that an acting force output by the hydraulic cylinder acts on the clamped pipe column by use of the action of a force arm, and the aim of three-point clamping is achieved. The production technology disclosed by the invention has the advantages of reasonable design, simple principle,compact structure, convenience in manufacturing, small size, light weight, good clamping stability and long service life.

Description

technical field [0001] The invention relates to a production process of hydraulic power back tongs for oil pipes, in particular to a hydraulic power back tong with multiple jaws and direct transmission for clamping oil pipes, which belongs to the mechanical manufacturing technology. Background technique [0002] In oil field wellhead tubing, casing, and drill pipe screw threads, in order to make the threaded connection of tubing and drill pipe easy to disassemble and have good stability, a power tong for pipe is usually used. It is composed of main tongs and backup tongs. The main tongs are used to clamp and unscrew the dismantling pipe, and the back tongs are used to clamp and stabilize the connecting pipe. The clamping form of the traditional power tongs for oilfield pipes is as follows: in the cavity contained by the main body of the back tong and the cover plate of the back tong head, there are four inner curved slope plates, the rollers are installed on the jaw plate, a...

AI Technical Summary

Problems solved by technology

However, although this structure can realize the clamping of any pipe string, its structure is relatively complicated, and there are many parts involved, especially the existence of gear meshing pairs, which not only requires higher machining accuracy, but also makes manufacturing more difficult. Large, and iron filings or other hard debris are easily caught in the gear meshing pair, which may easily cause the meshing pair to be stuck

Therefore, the back vise clamping device of the latter structure has large volume, heavy weight, high manufacturing cost and poor working stability.

The power of the above-mentioned structural forms is transmitted to the jaws by the gear train or its transmission parts to clamp the oil pipe, so there is a large loss of energy and the parts are easily damaged.

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