Research on bolt pretension torque closed-loop control device
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摘要: 针对现有煤矿锚杆预紧扭矩控制装置存在结构复杂、可操作性较差及控制精度较低的问题，设计了一种机械式锚杆预紧扭矩闭环控制装置。该装置通过充液波纹管液体压力的变化来测量齿圈扭矩,并将该压力作用于滑阀，当扭矩达到控制值时滑阀动作，使锚杆预紧回路断开，一个锚杆预紧过程结束。仿真与井下试验结果表明，该装置能有效控制扭矩在480~510 N·m内,响应速度快，可靠性高，控制精度达90%以上；温度、角度对测量结果不产生影响；扭矩倍增器传动效率、减磨垫摩擦因数分别导致控制结果误差为6.2%、10%，应使用摩擦因数较小的减磨垫并定期对扭矩倍增器进行维护。Abstract: In view of problems of complex structure, poor operability and low control precision of existing bolt pretension torque control device of coal mine, a mechanical bolt pretension torque closed-loop control device was designed. The device measures torque of gear ring by change of liquid pressure of the liquid-filled bellows and acts the pressure on slide valve. When the torque reaches control value, the slide valve can be action and makes the bolt pretension circuit cut off, so as to complete a bolt pretension process. The simulation and underground test results show that the device can effectively control torque within 480-510 N·m with fast response，high reliability and control accuracy of more than 90%. Temperature and angle have no influence on the measurement results. The torque multiplier's transmission efficiency and the friction factor of friction pad lead to the control result error of 6.2% and 10% respectively. The friction pad with smaller friction factor should be used and the torque multiplier should be maintained regularly.
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Keywords:
- bolt support /
- roof bolter /
- pretension torque /
- pretension force /
- torque multiplier /
- friction pad /
- transmission efficiency /
- friction factor
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期刊类型引用(9)
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