Internal clamp

Abstract

The invention relates to pipeline construction equipment, and provides an internal clamp which adopts the structure that a tensioning mechanism I (33), a tensioning mechanism II (34) and a tensioning mechanism III (35) are axially arranged and adjacent to one another; the tensioning mechanism II (34) and the tensioning mechanism III (35) are arranged corresponding to the same pipeline, and driven by the same hydraulic cylinder I; an actuating element III (19) and an actuating element II (16) are axially arranged side by side; the actuating element III (19) and the actuating element II (16) are used for pushing the tensioning mechanism III (35) and the tensioning mechanism II (34) to perform head pressing actions respectively, and adopt an integrated structure or are connected into an integration; the hydraulic cylinder I is used for driving the tensioning mechanism II (34) and the tensioning mechanism III (35) to act; a hydraulic cylinder II is used for driving the tensioning mechanism I (33) to act; the hydraulic cylinders (I and II) move in the same direction, and adopt an internal-external sleeving structure. Through the adoption of the internal clamp, the requirement for butt welding in such welding conditions as a welding assessment experiment and welding of an equipment process pipeline can be met.

Description

technical field [0001] The invention relates to pipeline construction equipment, in particular to an internal counterpart, especially suitable for welding conditions of short pipe joints such as welding evaluation experiments and process pipelines of equipment. Background technique [0002] The internal counterpart is used for the counterpart of two pipes before welding. The internal counterpart used in the prior art is mostly the internal counterpart of the long pipe section. The internal counterpart includes a front frame, tensioning mechanism I, expansion Tightening mechanism II, rear frame, driving mechanism, gas storage tank, rear traveling wheel, front traveling wheel and control system; the rear traveling wheel and tensioning mechanism II are located in the same pipeline, and tensioning mechanism II supports and cooperates with the rear traveling wheel Jointly complete the centering of equipment and pipelines; due to the existing structural design and arrangement of t...

AI Technical Summary

Problems solved by technology

[0002] The internal counterpart is used for the counterpart of two pipes before welding. The internal counterpart used in the prior art is mostly the internal counterpart of the long pipe section. The internal counterpart includes a front frame, tensioning mechanism I, expansion Tightening mechanism II, rear frame, driving mechanism, gas storage tank, rear traveling wheel, front traveling wheel and control system; the rear traveling wheel and tensioning mechanism II are located in the same pipeline, and tensioning mechanism II supports and cooperates with the rear traveling wheel Jointly complete the centering of equipment and pipelines; due to the structural design and arrangement of the existing internal counterparts, its axial length is long, which cannot meet the needs of welding conditions such as welding evaluation experiments and equipment process pipelines

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