Drill rod demagnetizing device and method

Abstract

The invention relates to a drill rod demagnetizing device and method, and belongs to the technical field of coal mine equipment. The demagnetizing device comprises a transmission mechanism, two demagnetizing coils connected with the transmission mechanism and synchronously and relatively moving at the same speed, and a controller electrically connected with the transmission mechanism and the demagnetizing coils, wherein the centers of the two demagnetizing coils are located on the same horizontal line, a drill rod is horizontally inserted into the inner cavity of each demagnetizing coil, and the two demagnetizing coils are symmetrical relative to the middle of the drill rod. According to the invention, the two demagnetizing coils symmetrically arranged relative to the middle of the drill rod relatively move at a constant speed along the length direction of the drill rod to demagnetize the drill rod in both directions while change the polar direction of the residual magnetism on the drill rod, the polar direction is distributed to two poles, and the magnetic poles are mutually counteracted, so that the residual magnetism is quickly and efficiently eliminated, the demagnetization efficiency is improved, and the measurement precision of a subsequent measurement while drilling system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coal mine equipment, and relates to a drill pipe degaussing device and method. Background technique [0002] With the development of comprehensive mechanized coal mining technology in coal mines in my country, the requirements for mine safety production on construction equipment and technologies such as underground exploration holes, water discharge holes, and gas drainage holes are also continuously increasing. high. Drill pipes are often used in conjunction with the measurement-while-drilling system to track the drilling trajectory. The magnetic sensor for measuring the azimuth in the measurement-while-drilling system cannot be interfered by magnetic objects, otherwise it will cause inaccurate angle measurement. During the production process of the drill pipe, the flaw detection process of the drill pipe will leave a certain degree of magnetism in the drill pipe. The magnetism of the drill pipe will aff...

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a drill rod degaussing device and method, through which two degaussing coils arranged symmetrically relative to the middle of the drill rod move relatively at a uniform speed along the length direction of the drill rod, so that the drill rod is demagnetized bidirectionally, While being simple and easy to implement, it achieves good residual magnetization elimination effect, improves degaussing efficiency, and solves the problems of low degaussing efficiency and poor degaussing effect in the prior art where degaussing machines can only degauss tapes in one direction.

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