A instrument for dismantling piston rod

The utility model discloses an instrument for dismantling piston rod fixes first downthehole at a fixing device with the pneumatic cylinder, realizes fixed to the pneumatic cylinder, and the wire rope one end on the fixed pulley is connected with the shaft hole of piston rod, the other end and driving hook connect, and through the motion of driving lifting hook pulling wire rope, wire rope pulling piston rod moves, takes out in following the cylinder of pneumatic cylinder with the piston rod. After the cylinder is taken out to the tip of piston rod, a piston rod entering strutting arrangement's second is downthehole, a strutting arrangement is not only to piston rod played a supporting role, simultaneously play the guide effect to the motion of piston rod, a strutting arrangement makes the axis height of piston rod equal with the axis height of cylinder, avoid the in -process axis location that the piston rod was being taken out to take place the skew, thereby it leads to the emergence of the sealing member damage and the piston rod fish tail cylinder inner wall condition effectively to have avoided the tip of piston rod to bump with the cylinder.