Hydraulic anchor bar drilling machine composite hydraulic control valve

The utility model relates to a combined hydraulic control valve for hydraulic bolt drillers use in coal mines, belonging to the technical field of coal-mining mechanical equipment. The utility model provides a hydraulic control valve for hydraulic bolt drillers which can coordinate rotary-cutting and move-in automatically. The controlling and change valves are parallel. To prevent the bend of the drilling rod caused by the excessive force of the move-in cylinder, a pressure reducer is connected in series before the change valve of the move-in cylinder, which could control the maximum propulsion of the controlling hydraulic pressure system. Compared with the serial system at the same pressure, the pressure drop between the entrance and exit of the hydraulic motor is increased which intensify the ability of rotary-moment exportation. Since the rotary-cutting and move-in can coordinate automatically and the speed hardness of the drilling speed of the driller is relatively great, the rates of rotary-cutting and move-in are stable and relatively less influenced by the load change. Therefore the efficiency of the hydraulic bolt driller is greatly improved and the utility model is fit for a plurality of hydraulic bolt drills.