The utility model discloses a pull out trochus and rim plate thereof. Offering the constant head tank that is used for holding the area and pulls out the rim plate on the pressure driving disk face of rim plate, setting up the location opening on the tank bottom face of constant head tank, the cell wall mask of constant head tank has the location section of the arc of laminating on waiting to pull out the outer peripheral face of band pulley that is used for coincideing, and the location section is coaxial with the disk body. After like this on rim plate cutting ferrule motor shaft, along with the pressure driving disk face of the disk body of rim plate compress tightly wait to pull out the band pulley on motor body's terminal surface, it can block in the constant head tank of pressing on the driving disk face to wait to pull out the band pulley, and the laminating can be coincide on waiting to pull out the outer peripheral face of band pulley to the location section of the cell wall face of constant head tank, it the incline can not appear being moved the in -process by the pressure to utilize location section and relative position between the tank bottom face to guarantee to wait to pull out the band pulley, just also avoided the belt pulley being pulled up in -process and motor shaft problem divergent relatively, avoided the in -process that the belt pulley was being pulled up the jamming can not appear on the motor shaft, make the belt pulley at the epaxial dismantlement labour saving and time saving of motor.