Lubricating device

The utility model discloses a lubricating device, including cylinder and piston rod, the uide bushing has been cup jointed in the activity between cylinder and the piston rod, the inside fixedly connected with dust ring of uide bushing, the one end fixedly connected with piston of piston rod, the bottom fixedly connected with buffer of piston, the bottom fixedly connected with base of cylinder, the fixed surface of piston rod and piston has cup jointed the casing, the oil storage tank has been seted up to the inside of casing, the inside roll connection of oil storage tank has the ball, the one end of oil storage tank with advance the oil pipe intercommunication. The utility model discloses a set up circulation hydraulic pressure oil duct, advance oil pipe and go out oil pipe through be equipped with hydraulic pressure respectively on the casing lateral wall to connect the circulation hydraulic pressure oil duct that has discharge valve and hydraulically controlled check valve betweenthe two, hydraulic oil ca