Borehole inner wall ultrasonic scanning and imaging device and method

Abstract

The invention provides a borehole inner wall ultrasonic scanning and imaging device, which comprises an external connection unit, a guidance pipe body and a scanning unit, wherein the external connection unit comprises a numerical control module and a wind speed regulation and control device; the numerical control module is connected with the scanning unit; the wind speed regulation and control device is provided with an air duct which is independently connected with the wind speed regulation and control device and the guidance pipe body; a magnetic pull wire is arranged between the numericalcontrol module and the scanning unit; the scanning unit comprises a scanning unit shell, wherein an ultrasonic distance measuring instrument and a scanning driving motor are arranged in the scanning unit shell; the motor shaft of the scanning driving motor is connected with a transmission shaft; the transmission shaft is connected with the ultrasonic distance measuring instrument; and the ultrasonic distance measuring instrument is provided with an ultrasonic probe. In addition, the invention also provides a scanning and imaging method for the above borehole inner wall ultrasonic scanning andimaging device. By use of the device disclosed by the invention, the three-image scanning and imaging of the borehole inner wall can be realized, a three-dimensional scanning image of a whole boreholeis obtained, and the detection of a hole collapsing position of the borehole is realized.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to an ultrasonic scanning imaging device and method for the inner wall of a borehole. Background technique [0002] Coal mining conditions in most areas of the country are harsh, the mining depth is large, the gas content in the coal seam is high, the pressure is high, the gas permeability of the coal seam is low, the geological structure conditions are complex, and gas accidents are prone to occur. Reducing and preventing gas accidents has become an urgent problem in the field of coal mine safety. The problem. At present, the most common method of gas drainage in my country is to use boreholes to pre-drain the coal seam gas in the mining face. The most commonly used method of gas drainage is comprehensive gas drainage. Ground vertical-downhole horizontal directional drilling and underground coal seam drilling. Because the coal body becomes soft in the high-gassy so...

AI Technical Summary

Problems solved by technology

Therefore, the judgment of the location of the collapsed hole and the mastery of the layout of the entire length of the hole wall are important foundations for the prevention and control of the entire hole collapse. The traditional method of judging the location of the collapsed hole mostly relies on the amount of cuttings during the drilling process combined with the work experience of the worker's master. Make a rough judgment, the judgment accuracy is not high, the severity of the hole collapse is not clear, and the situation of the entire hole wall after the hole is drilled cannot be effectively grasped

There are problems such as inaccurate judgment of the position of the collapsed hole and unclear gradual change process of the hole circumference of the drilled hole

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