Side protection plate pushing device of hydraulic support

The utility model discloses a side protection plate pushing device of a hydraulic support. A through cavity is formed in a cylinder barrel. A first through hole and a second through hole are formed in the side wall of the cylinder barrel. A first connector base is arranged at the first through hole. A second connector base is arranged at the second through hole. A cylinder deck is welded to one end of the cylinder barrel. The end, provided with a piston, of a piston rod extends into the through cavity from the other end of the cylinder barrel. The piston is located between the first through hole and the second through hole. A supporting part is arranged at the end, located outside the cylinder barrel, of the piston rod. A limiting sleeve is arranged on the side wall of the piston rod and is close to the supporting part of the piston rod. The limiting part of the limiting sleeve abuts against the end of the cylinder barrel. A first sealing piece is arranged between the piston and the cylinder barrel. A second sealing sleeve is arranged between the limiting sleeve and the piston rod. The side protection plate pushing device is compact in overall structure, easy to machine, stable and reliable in mechanical structure in the repeated utilization process, not prone to working medium leakage and high in sealing performance.