Arch-shaped frame valve spring replacer and head transmission mechanism thereof

The utility model provides an arch-shaped frame valve spring dismounting device and a head transmission mechanism thereof, and relates to the field of valve dismounting tools. Comprising an outer sleeve, an inner sleeve, a trapezoidal threaded screw and a pressing rod, one end of the inner sleeve is open, a trapezoidal threaded nut is arranged in the inner sleeve, the other end of the inner sleeve is closed, and a pressing head is connected outside the closed end and used for installing an overhead head; one end of the outer sleeve is closed, a through hole is formed in the closed end, the other end of the outer sleeve is open, the outer sleeve is arranged outside the inner sleeve in a sleeving mode, and the open end of the outer sleeve is close to the pressing head; the trapezoidal thread screw comprises a thread part and a head part, the thread part penetrates through the inner sleeve and is screwed with the trapezoidal thread nut, and the head part penetrates through the through hole of the outer sleeve an