Axial feed mechanism

The utility model discloses an axial feed mechanism, including screw rod driving device, connecting seat, ball, integral key shaft, spline housing, rotation sleeve and toolbox, the integral key shaft makes up for the suit with the spline housing, connecting seat fixed mounting is on spline housing upper portion, ball upper end is by installing the screw rod driving device drive on the connecting seat, and the ball lower extreme passes connecting seat and integral key shaft upper end downwards to be connected just between ball and the connecting seat axial and to lock, ball, rotation sleeve rotates with radial fixed mode than the spline housing length and with the axial and cup joints outside the spline housing, the lower extreme at rotation sleeve is installed to the toolbox, the spline housing lower part is equipped with and is used for stretching into the positioner who advances line location in the pipe fitting. The utility model discloses can be applicable to the fixed occasion of constrictive working spa