Measurement of coal mining height based on hydraulic support structural angle

The coal mining height measurement problem has been addressed and a solution method has been proposed using hydraulic support angle sensor. The measurement height model was analyzed by using a two-leg type hydraulic support’s angle. Then,considering the base of slope angle,the influence of inclined slope angle formula was derived for height measurement. To analyze the factors influencing the precision of height measurement,the authors examined the procedure with the aim of improving the accuracy of angle measurement including changing the installation posi- tion,and using the Kalman filtering method to eliminate vibration noise. A height measurement system with four dual- axis tilt sensors was designed using angle measurement method. The height measuring sensor method was verified by performing ground tests in the laboratory and underground experiments. A height measurement accuracy of 5-10 cm in 6 m hydraulic support has been achieved. In comparison with the laser ranging,the test results have shown that the proposed method has a stronger environment adaptability in coal dust environment.