Abstract:
Longtan Coal Mine faces problems of serious broken roof,unreasonable layout,difficulty in moving,and high labor intensity in the traditional advanced support for composite roof thin and medium-thick coal seams. According to the principle of the stability control principle of the gateroad surrounding strata and fast driving and supporting,a lightweight lateral self-moving advanced hydraulic support system consisting of 8 advanced supports and 2 face-end supports is developed using theoretical calculation and structural design methods. Application results of Longtan coal mine 3124S working face shows thatdue to the 800 mm arrangement left between the advanced support,the roof damage is reduced by 2 times while moving an advanced support,which ensure the stability of the roof. The problem of unreasonable equipment arrangement of thin-medium-thick coal seam was solved effectively. The overall base was coordinated with the double-push jack with the assistance of the double-offset helper to ensure a smooth and coordinated forward shift of the forward bracket,which reduced downtime greatly. The speed of working face propulsion was increased by 15% to 20%. Supporting video surveillance system,control system,sensing system,to achieve the central control center of the advanced support system remote control and manual intervention,greatly reduce the labor intensity of workers,each shift ahead of maintenance workers reduced by 67%. The new advance support system provide a guarantee for the safety and efficient production of intelligent integrated working face.