Patent ID: 11964350
Assignee: YANTAI JEREH PETROLEUM EQUIPMENT & TECHNOLOGIES CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 14:
15. A usage method of a puller comprising:
providing the puller, the puller, comprising a first claw and a second claw arranged opposite to each other, wherein,
the first claw comprises a first pulling part, a first limiting part and a first connecting part connecting the first pulling part and the first limiting part; the first limiting part comprises a first body part, a first notch part and a second notch part; the first notch part is located at one side of the first body part close to the second claw in a first direction, and the second notch part is located at one side of the first notch part away from the first body part in the first direction; a size of the second notch part in a second direction is larger than that of the first notch part in the second direction, and the second direction intersects with the first direction,
the second claw comprises a second pulling part, a second limiting part and a second connecting part connecting the second pulling part and the second limiting part; the second limiting part comprises a second body part, a third notch part and a fourth notch part; the third notch part is located at one side of the second body part close to the first claw in the first direction, and the fourth notch part is located at one side of the third notch part away from the second body part in the first direction; a size of the fourth notch part in the second direction is larger than that of the third notch part in the second direction,
a size of the first limiting part in the first direction and a size of the first pulling part in the first direction are both larger than that of the first connecting part in the first direction; and a size of the second limiting part in the first direction and a size of the second pulling part in the first direction are both larger than that of the second connecting part in the first direction, and
a size of the second pulling part in the second direction is smaller than or equal to that of the second notch part in the second direction,
placing the first claw into a valve seat and pushing the first claw towards an edge of the valve seat,
placing the second claw into the valve seat through the second notch part and pushing the second claw towards the edge of the valve seat,
assembling the first claw with the second claw,
screwing one end of a leading screw into the puller through the first notch part, the second notch part, the third notch part and the fourth notch part, so that the one end of the leading screw is connected with the first pulling part and the second pulling part, and
sleeving a hydraulic driving device onto the other end of the leading screw and fixing the hydraulic driving device by a nut,
wherein the first limiting part and the second limiting part respectively are abutted against an upper end face of the valve seat.