The utility model discloses an automatic
punching tool for a valve hole of a
butterfly valve seat sealing ring, and belongs to the technical field of
butterfly valve seat sealing ring
machining. The device comprises a
machine cabinet, a supporting frame is fixedly arranged on the
machine cabinet, a through hole is formed in the
machine cabinet, and a positioning
assembly used for positioning a sealing ring to the position above the through hole is detachably installed on the machine cabinet; the device further comprises a
punching device, a transverse moving
assembly for driving the
punching device to transversely move along the supporting frame is arranged on the supporting frame, and the punching device comprises a lifting
assembly connected with the transverse moving assembly in a matched mode. When the trimming machine is used, the
cutting cylinder is used for
cutting the roots of trimmings, after
cutting is completed, the push-pull assembly shrinks, the cutting cylinder is driven to move upwards along the tamping cylinder, the lifting assembly moves downwards, the tamping cylinder is driven to extrude the trimmings, and the trimmings on the positioning cylinder are fed into the feeding port along the slope face on the inner side of the upper end of the positioning cylinder and then enter the through hole; and finally, the flash falls into the collecting
barrel, so that the flash is
cut, separated and collected.