Abstract
The technology of coal-rock interface recognition is the core of realizing the automatic heightening technology of shearer’s rocker. Only by accurately and quickly identifying the interface of coal and rock can we realize the fully automatic control of shearer. As the only one used in the actual detection of coal mining machine drum cutting coal seam after the thickness of the remaining coal seam detection method, natural γ-ray has a very practical advantage. Based on the relationship between the attenuation of the natural γ-ray passing through the coal seam and the thickness of the coal seam, the mathematical model of the attenuation of the natural γ-ray penetrating coal seam is established. By comparing the attenuation intensity of γ-ray with or without brackets, it is verified that the hydraulic girders will absorb some natural γ-rays. Finally, this paper uses the ground simulation experiment and the field experiment to verify the correctness of the mathematical model and finally develop the natural γ-ray seam thickness sensor. The sensor has the function of indicating the thickness of the coal seam, measuring the natural γ-ray intensity, and storing and processing the data.
Highlights
Coal is the main energy source in China; the safe and efficient mining of coal is important for China’s economic development
Coal mining machine as a key tool for coal mining face, how to achieve its automatic control is of great significance
To achieve fully automatic control of the shearer, we must first solve the problem of how to accurately determine the interface of coal and rock; only in this way, we can effectively solve the problem of shearer cutting drum increase automatically according to the coal seam ups and downs
Summary
Coal is the main energy source in China; the safe and efficient mining of coal is important for China’s economic development. To achieve fully automatic control of the shearer, we must first solve the problem of how to accurately determine the interface of coal and rock; only in this way, we can effectively solve the problem of shearer cutting drum increase automatically according to the coal seam ups and downs. E natural c-ray method can measure the residual radiation intensity of c-ray from rock stratum after the attenuation of the coal seam, and the thickness of the top-coal seam can be determined according to its attenuation law, so as to achieve the purpose of coalrock interface identification. The mathematic model of the interface identification of coal and rock is proposed by establishing the relationship between the natural c-ray attenuation intensity and the thickness of the coal seam, the presence of the brackets, and the natural c-ray attenuation law. Using the ground simulation experiment and field experiment, the correctness of the data model is verified and developed into a natural c -ray coal thickness sensor
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