Ultrasonic leakage detector for gas exhaust pipe for coal mine

Abstract

The invention discloses an ultrasonic leakage detector for a gas exhaust pipe for a coal mine, and relates to a gas leakage detection instrument. The ultrasonic leakage detector comprises an ultrasonic probe, a signal amplifying circuit, an audio processing circuit, a frequency display circuit and a singlechip controller, wherein the ultrasonic probe is used for acquiring leakage ultrasonic signals generated by pipe leakage; the leakage ultrasonic signals pass through the signal amplifying circuit and are input to the audio processing circuit; the audio processing circuit converts the leakage ultrasonic high-frequency signals into human eye audible low-frequency signals; and the frequency display circuit displays the frequency values of the ultrasonic signals in real time. The leakage ultrasonic signals generated by pipe leakage are acquired by adopting the ultrasonic probe, and the leakage ultrasonic high-frequency signals are converted into the low-frequency signals or the frequency values of the ultrasonic signals are displayed in real time through the frequency display circuit; and the leakage detector has low cost, is convenient to use, high in speed, accurate, reliable and convenient for field detection, and is suitable for gas leakage detection of a gas delivery pipe in the explosive gas environment under the coal mine.

Description

technical field [0001] The invention relates to a gas leak detection instrument, in particular to an ultrasonic leak detector for gas drainage pipelines used in coal mines. Background technique [0002] In recent years, with the improvement of mine production mechanization and production intensification, more mining areas have entered into deep mining, and the amount of gas emission has increased sharply. Extracting and utilizing the gas in the coal seam can not only prevent and reduce the occurrence of major gas accidents in coal mines, ensure safe production in the mine, but also protect the environment of the mining area and obtain better economic and social benefits. The control, mining and utilization of coal mine gas are inseparable from gas transportation. Pipeline leakage is an important safety hazard for the safe transportation of underground gas. The concentration of coalbed methane in the coal mining area is determined by the extraction method and process and th...

AI Technical Summary

Problems solved by technology

Most of the coalbed methane transmission pipelines (that is, gas drainage pipelines) used in underground coal mines are still metal steel pipes, but the steel pipes have problems such as easy corrosion, low installation efficiency, short service life and easy friction sparks.

Although non-metallic pipelines have gradually begun to be popularized and applied in coal mines in recent years, their progress is slow and the effect of use is not ideal. The main reason is that the safety and reliability of the current non-metallic pipeline systems are not good enough. There are disadvantages such as poor resistance to long-term negative pressure (easy to absorb deflation), low impact toughness (easy to brittle failure), etc.

[0005] Therefore, there is still a lack of security technology for the underground transportation pipeline network.

Images