Eddy current non-contact multi-channel diameter detector in pipeline

Abstract

The invention discloses an eddy current non-contact multi-channel diameter detector in a pipeline. The detector comprises a tubular front detector warehouse, a computer warehouse and a battery warehouse. The detector is characterized in that the front detector warehouse, the computer warehouse and the battery warehouse are arranged in sequence, every two adjacent warehouses are connected through a coupler, and supporting wheels are evenly distributed at the outer side of each warehouse in the circumferential direction. A power leather cup is arranged at the axial front end of the front detector warehouse, an eddy current detection ring is arranged at the axial rear end of the front detector warehouse, and a three-channel eddy current sensor is at least arranged in the eddy current detection ring. A single chip microcomputer data processing unit is arranged in the computer warehouse, and a data storage device and a USB plug are also arranged in the computer warehouse. Eddy current detection signals are obtained through an eddy current detection circuit. A lithium battery and a positioning device are arranged in the battery warehouse, and a mileage wheel is arranged at the rear end of the battery warehouse. The eddy current non-contact multi-channel diameter detector is suitable for all pipelines, can solve the problems that the pipeline is easily blocked when the diameter of the large tapered pipeline is detected to the maximum degree, and calibration is not needed every time the detector is used.

Description

technical field [0001] The invention belongs to the technical field of pipeline detection, in particular to an eddy current non-contact multi-channel diameter detector in pipelines mainly used for long-distance pipelines. Online detection of flattening deformation of metal pipelines due to transportation or construction, changes in inner diameter of pipelines, turning radius and direction of elbows, and pipeline ancillary equipment (including valves, tees, flanges, bypasses, welds, transformers, etc.) diameter short section). At the same time, the built-in positioning system of the equipment can accurately lock the position of the above-mentioned pipeline features, providing relatively complete archives for the basic situation of the pipeline. Background technique [0002] Pipeline transportation capacity represents a country's industrial development level. Domestic pipeline laying is now developing at a rate of 10,000-20,000 kilometers per year. By 2015, the total length o...

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Problems solved by technology

[0005] Starting from the working principle, the contact diameter detector has an unsolvable technical bottleneck: because the probe part is in direct contact with the inner wall of the pipe, it is easy to scratch the pipe or the inner coating of the pipe; because the probe part is in direct contact with the inner wall of the pipe, the contact surface of the probe is worn , resulting in a drop in accuracy; contact probes all use cantilever devices with complex structures and are not suitable for small-diameter pipes below DN300; Before each use, the probe needs to be re-calibrated to ensure the consistency of each probe; the contact probe detector has low precision and poor anti-interference ability due to the cantilever device

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