Abstract
In this paper, to identify the roof unconfined compressive strength (UCS) in the process of coal mine roadway support in real-time and optimize the real-time drilling speed while drilling, this paper proposes and establishes a drilling test method for assessing the uniaxial compressive strength (UCS) of a roof. This method can be used to optimize the speed of drilling. Moreover, a mathematical model of the power output is developed for a roof-strata identification system with a drilling test system. The results were as follows: (1) the system was able to identify the uniaxial compressive strength of roof rock; (2) the pressure of the drill leg of the pneumatic bolt did not match the output power of the pneumatic motor, the pneumatic motor could not reach the maximum power point, and the insufficient thrust of the pneumatic leg led to failure of the maximum output power of the pneumatic motor; (3) to increase the output power of the air motor and thus improve the drilling speed, we applied a booster valve for the system. The experimental results show that the power of the air motor has a linear relationship with drilling speed. In this way, the speed of the drill can be increased by increasing the motor power.
Highlights
IntroductionAcademic Editors: Pavlo Krot and Radosław Zimroz
We found that the power of the pneumatic motor was linearly related drilling speed,speed, we found that the power17, of which the pneumatic motorthat wasincreasing linearly related to the drilling as shown inpower
The present research found that the maximum output power of the pneumatic motor was related to the unconfined compressive strength of different rocks and the support-leg pressure
Summary
Academic Editors: Pavlo Krot and Radosław Zimroz. Coal mine roadways are important living environments for underground workers and provide paths for mineral lifting, transmission, drainage, ventilation, and mining machinery excavations [1]. Bolt supports have an important impact on coal mining. Due to their ability to strengthen the surrounding rock and their low cost, bolt supports can accelerate the speed of roadway formation, improve labor intensity and the working environment, and make coal mining more efficient with a higher yield. Bolt support has become the main type of support form in all countries, especially in developed countries such as Australia, the United States, and Britain [2]
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