Study on Safety Withdrawing Technology of Hydraulic Powered Supports from Fully Mechanized Coal Mining Face

In order to solve the low efficiency,poor safety and other problems existed in the hydraulic powered supports withdrawing from the fully mechanized coal mining face,from the safety withdrawing technology of the hydraulic powered supports and the equipment matching technique,the withdrawing technology with a single channel in single wing and withdrawing technology with multi channels of auxiliary gateway were studied and optimized and were in comparison with the conventional fa ce equipment removing technology.A layout mode of ZZ7200/1 8/36 mode delta area shield support was applied to the above two powered support withdrawing technolo gies and thus the safety withdrawing space could be safely and effectively controlled.With application of the WC40Y series powered support removing truck and the WC 25EJ series removing truck and other auxiliary transportation equipment,the withdrawing time of the hydraulic powered support could be reduced individually about 27 d ays and 35 days and the working hour could be reduced about 60% and 85% .Meanwhile the withdrawing technology with a single channel of single wing with a low requ irement of gateway driving quantity and a low requirement of the gas content would have a higher suitability than the withdrawing technology with multi channels of the auxiliary gateway.