Abstract
In order to reduce the dynamic load of cutting transmission system and maintain the coal productivity under sudden-changing load conditions, the drum speed control strategy and traction-drum speed combined control strategy were proposed to adapt to different sudden-changing load conditions based on analyzing the influence factors of drum load and productivity. When sudden-changing load is small, the drum speed control strategy is adopted; when sudden-changing load is large, the traction-drum speed combined control strategy is adopted. The model of cutting transmission system has been established and analyzed, and the results show that the proposed strategies can not only reduce the dynamic load effectively, but also maintain the highly coal productivity under sudden-changing load conditions. Aiming at the overshoot of system load in the variable speed process, the speed variation rate of cutting motor of the two control strategies was optimized, respectively, and the load overshoot can be reduced effectively. The conclusions have been verified by building the test bench.
Highlights
At present, coal accounts for 64% of China’s energy consumption, and in the decades, coal will still be the main energy source in China [1]
In order to reduce the dynamic load of cutting transmission system and maintain the coal productivity under suddenchanging load conditions, the drum speed control strategy and traction-drum speed combined control strategy were proposed to adapt to different sudden-changing load conditions based on analyzing the influence factors of drum load and productivity
The model of cutting transmission system has been established and analyzed, and the results show that the proposed strategies can reduce the dynamic load effectively, and maintain the highly coal productivity under sudden-changing load conditions
Summary
Coal accounts for 64% of China’s energy consumption, and in the decades, coal will still be the main energy source in China [1]. The drum speed of existing shearers can’t be adjusted, so these shearers have the shortages of high failure rate, bad adaptability and low coal productivity. The references [9, 10] achieved better coal productivity and lump coal rate through matching drum speed and traction speed. Most researches haven’t considered the load of transmission system and coal productivity synthetically when studying on how to reduce drum load. According to the different operation conditions of shearer and the change of cutting resistance, the drum speed control strategy and traction-drum speed combined control strategy are put forward. The effectiveness of the control strategies has been proved by building simulation model and test bench
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