Dynamic Model and Simulation Analysis of Advancement of Fully Mechanized Mining Face

doi:10.3901/JME.2022.07.117

Abstract

Abstract: The automatic straightening control strategy of fully mechanized coal mining face needs to be verified by experiment. To overcome the complexity of test at the coal mine site and the problem coal seam cut is unrecoverable, a mathematical model that simulate the progress of advancement of fully mechanized coal face is proposed. Considering factors such as inclination angle of coal seam, structure size and operating parameters of fully mechanized mining equipment, resistance generated by falling coal and roof and forces generated by roof and floor, the mechanical model of hydraulic support during push-pull process is proposed. Mathematical models of quantitative pump, electro-hydraulic directional valve, hydraulic control check valve, relief valve, hydraulic cylinder are established, and the hydraulic model of advancing control circuit is established based on cavity-node method. On the basis of the mechanical model of hydraulic support during push-pull process and the hydraulic model of advancing control circuit, mechanical-hydraulic coupling simulation model of fully mechanized coal mining face is proposed. Through simulation experiment, it is found that since pushing load gradually increases with the increase of the advancing distance, difference in pushing load caused action of pushing cylinders are out of sync, which in turn leads to the straightness error of scraper conveyor. With the increase of number of cutting cycles, accumulation of errors causes the straightness error of scraper conveyor to gradually increase. Abnormal load will reduce the synchronization of advancing hydraulic support, which causes the alignment error of hydraulic support. The dynamic advancement model of fully mechanized mining face provides the basic theory and test platform for control strategy of the advancement fully mechanized mining face

Key words: fully mechanized mining face, hydraulic support, scraper conveyor, mechanical-hydraulic coupling simulation

CLC Number:

TD421

WANG Shibo, ZHANG Hui. Dynamic Model and Simulation Analysis of Advancement of Fully Mechanized Mining Face[J]. Journal of Mechanical Engineering, 2022, 58(7): 117-130.

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