Automated mining technology and equipment for fully-mechanized caving mining with large mining height in extra-thick coal seam

WANG Guo-fa; PANG Yi-hui; MA Ying

doi:10.11799/ce201801001

Abstract：In view of the technical difficulties of fully mechanized top coal caving mining in the hard and thick seam in mining areas of western China,we studied the coupling between hydraulic support and surrounding rock for fully mechanized top coal caving face with large mining height,analyzed the roof coal caving structure and the determination method of hydraulic support working resistance,developed the intelligent support-rock coupling control system and automatic top coal caving control system,realizing automatic mining of fully mechanized top coal caving mining face with large mining height.Based on the coupling relationship between hydraulic support and surrounding rock of the fully mechanized top coal caving mining face in hard and ultra-thick seam,we established the of cantilever beam model for hard top coal caving and the combined cantilever beam model of roof strata structure instability,and then proposed the determination method of reasonable mining height for high fully mechanized caving face and reasonable working resistance of hydraulic support.By analyzing the bearing characteristics of the two-leg strong hydraulic support,we innovatively designed a three-stage high efficiency and strong perturbation coal caving mechanism with large mining height,and developed the intelligent coupling control system of the hydraulic support,realizing real-time monitoring of support posture and stress status.Based on the logical relationship for timing control of automatic coal caving using multi-window and multi-turn coal caving technology in the fully-mechanized top coal caving face,an automatic coal caving control device was developed to realize the safe,efficient,high recovery rate and automated mining of fully mechanized top coal caving mining face in the hard and thick coal seam.