Mileage measuring mechanism for inner detection of pipeline

Abstract

The invention relates to a mileage measuring mechanism for inner detection of a pipeline, and applies to the field of millage measuring and positioning for inner detection of an oil gas pipeline. The mechanism is that a mileage wheel I and a mileage wheel II are respectively mounted at two ends of a floating arm; the floating arm, a rotating arm and a spring form a triangular structure; the mileage wheel I and the mileage II are clung to the pipe wall all the time under the tension effect of the spring. The mechanism has the characteristics of being simple in structure and small in space used; the capacity of the mechanism passing through the pipeline is improved; in addition, the diameter of the mileage wheels can be relatively increased; a rotating force arm is enlarged, thus the slipping can be avoided, and as a result, the mileage measurement accuracy can be improved.

Description

technical field [0001] The invention relates to a mileage measuring mechanism for in-pipeline detection, which is applied to the field of mileage measurement and positioning required for detection in oil and gas pipelines. Background technique [0002] Oil and gas pipelines are affected by factors such as medium corrosion and environmental changes during use. Defects may occur, and oil leakage may occur, causing environmental pollution. Therefore, regular inspections of pipelines are required. Long-distance pipeline inspections generally The magnetic flux leakage detector or ultrasonic detector is put into the pipeline, driven by the pressure difference in the pipeline to make the detector advance in the pipeline and measure the pipeline defect information. In order to obtain the axial length of the defect, the position of the defect and the length of the pipeline, mileage measurement is required . [0003] The current mileage measurement method is mainly to connect the mil...

AI Technical Summary

Problems solved by technology

[0003] The current mileage measurement method is mainly to connect the mileage wheel with the sensor to the detector body through a swingable arm, and the swing arm is equipped with a spring to make the mileage wheel roll close to the pipe wall to realize mileage measurement. Small, especially the pipe space with smaller pipe diameter is smaller, which not only reduces the obstacle-surpassing ability of the detector, but also makes the diameter of the mileage wheel smaller, which is easy to slip, resulting in reduced measurement accuracy

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