Electromechanical braking technology is an effective way to improve the braking response of mine hoist. Based on the analysis of mechanical disc brake of mine hoist, the control process is analyzed in detail, and then the control strategy is obtained. An automatic control system based on linear quadratic regulator and PI controller is proposed. The braking goal of self-adaptive adjustment of braking clearance and on-line adjustment of braking force is realized. The results of the experiment indicate that the brake gap adjustment time is less than 10s, stable within 1±0.2mm, and the steady-state error is less than 2%. The positive pressure of the brake has a linear relationship with the motor voltage, with a slope of 920.4 and an intercept of -1298.88. The problems of low automation and high pollution of the existing hydraulic brake have been solved, which provides a new way for the control system of electromechanical brake.
According to the dynamic tension testing requirements of the multi-rope winder rope, this paper designs the sensor used to measure the tension of steel wire rope directly. The sensor uses the strain shear measuring principle, and has many features with small size, big measuring range, easy to install, don’t change the structure of connected devices and so on. Application of the finite element analysis software makes the structure of the sensor optimized, and then enhance the static and dynamic performance of the sensor.
In order to realize online real-time monitoring of the hydraulic bracket support, improve the existing communication system, and improve the reliability of data transmission, this paper set up the communication simulation system and platform to simulate the coal mine communication based CAN bus. Based on the design and analysis of system hardware and software, this paper completed the construction of the whole hardware and the debugging of communication system. The debug end can communicate simulate by the CAN protocol simulation device, and realized the work of the entire communication system. Experiments showed that the monitoring system can work reliably.
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