A traction device for a detector in a variable-diameter pipeline

Abstract

The application provides a traction device for a variable-diameter pipeline detector, including: a head drive assembly, a cabin body, and a tail drive assembly, wherein the head drive assembly, the cabin body, and the tail drive assembly are coaxially arranged, and the One end of the cabin body is connected with the head driving assembly, and the other end is connected with the tail driving assembly. The head driving assembly and the tail driving assembly include a foldable umbrella structure; the head support arm assembly and the tail support arm assembly include a plurality of link mechanisms with return springs. The supporting parts of the cup assembly are joined by folds that are evenly spaced apart, and the support parts and the folds are symmetrically distributed. Therefore, when the traction device enters a small-diameter pipeline, the cup assembly is first deformed from the fold, so that the cup assembly can shrink or expand quickly, and still maintain a circular shape without affecting the sealing of the pipeline.

Description

technical field [0001] The present application relates to the technical field of pipeline detection equipment, in particular to a traction device for a variable-diameter in-pipe detector. Background technique [0002] As a special detection instrument, the oil and gas pipeline internal detector is often used to detect the internal defects of the oil and gas pipeline. It runs inside the pipeline and is pushed forward by the medium in the pipeline to make the detector run forward. The detector in the oil and gas pipeline is mainly composed of a traction device and a detector. The traction device does not generate power, and relies on the pressure difference generated by the sealed pipeline to provide the driving force. [0003] The traction device of conventional in-pipe detectors is mainly composed of polyurethane sealing cups and cabins. The sealing cups are divided into dish-shaped, straight-plate-shaped, conical-shaped and other shapes, which not only seal the pipe but als...

AI Technical Summary

Problems solved by technology

The maximum deformation of the conventional cup is about 10%-15%. When the deformation is large, the pressure of the pipeline on the cup will be increased, which will lead to aggravated wear of the cup and affect the normal sealing of the cup.

[0004] The cup of the pulling device of the conventional detector is circular, increasing the amount of deformation will cause uneven wrinkles locally and cause seal failure

If a small-diameter cup is used, although it runs smoothly in a small-diameter pipe section, it will lose its power to run in a large-diameter pipe due to too much effusion; if a large-diameter cup is used, it will run smoothly in a large-diameter pipe section. Running, but in small diameter pipes, the interference may be too large, which may cause jamming

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