System is increaseed to coal -winning machine rocking arm based on digit hydro -cylinder

The utility model discloses a system is increaseed to coal -winning machine rocking arm based on digit hydro -cylinder, including digital hydro -cylinder and PLC controller, digital hydro -cylinder include hydraulic oil pump, hydraulic tank and with coal -winning machine tractive unit fixed connection's cylinder body, the piston rod that is provided with integrated motor in the cylinder body and is connected with the rocking arm, the input termination of PLC controller has the digital input module and sets up distance sensor on the piston rod, the output termination of PLC controller has the display module. The utility model has the advantages of simple structure and reasonable design, the electric pulse signal who sends through digital input module control PLC controller, the electric pulse signal who sends through digital input module control PLC controller, negative feedback spin control through lead screw and piston rod realize the overhanging of piston rod, detect the extension ofpiston rod and realize t