Abstract: In order to effectively control the dust in the cutting area of the continuous mining face,aiming at the shortcomings of the traditional spray dust reduction measures of the continuous mining machine,such as poor atomization effect and small coverage,the parameter optimization experiment of the nozzle for dust reduction was carried out,and the equivalent aperture 1. 8 mm fan nozzle with sealing control characteristics and the equivalent aperture 2 mm solid cone nozzle with atomization dust capture characteristics were obtained. Based on the field conditions and continuous mining process characteristics of 15218 continuous mining face in Hongliulin Coal Mine,the dust control design of the cutting area of the continuous mining machine in the working face was carried out,and a new external spray control and dust reduction device of the continuous mining machine was developed. The adjustable ball valve was installed between the atomizing nozzle and the external spray control and dust reduction device,and the combination mode of " external spray control and dust reduction device + adjustable universal ball head + atomizing nozzle" was adopted,which not only reduced the frequent disassembly of the nozzle. The wear of the internal thread of the external spray control and dust reduction device was easy to adjust the spray direction of the atomizing nozzle to meet the dust reduction needs of the continuous mining machine. In order to improve the water pressure of the water supply pipeline of the continuous miner,through the calculation of the water consumption of each device on the continuous miner and the pressure loss along the water supply pipeline of the continuous miner,the booster pump with rated flow of 250 L / min and rated pressure of 6. 3 MPa is preferably used to supercharge the water of the continuous miner,and a high-pressure atomization closed dust control system for the cutting dust source of the continuous miner suitable for the continuous mining face of Hongliulin Coal Mine is formed. The field application shows that after using the system,the total dust reduction rate in the cutting area of the continuous miner is greater than or equal to 82. 3%,and the respirable dust reduction rate is greater than or equal to 72. 5%, which effectively reduces the dust production and overflow in the cutting area,and realizes the closed and efficient prevention and control of the cutting dust source of the continuous miner.

Key words: continuous mining machine,dust,heading face,cutting area,spray dust reduction