Large carrier rocket storage tank bottom clamping and positioning device

A large carrier rocket storage tank bottom clamping and positioning device comprises a supporting frame, a stand column, an internal molded surface supporting block, an external pressing mechanism and an upper pressing mechanism, the internal molded surface supporting block is fixed to one side of the upper surface of the supporting frame, the stand column is fixed to the other side of the upper surface of the supporting frame, and a nut hole is formed in the lower portion of the stand column; the nut hole is internally connected with an external pressing mechanism through a lead screw nut pair, a positioning block is welded to the top of the stand column, a horizontal rotating cantilever is rotationally connected to the positioning block through a rotary pin, and the end of the horizontal rotating cantilever is connected with an upper pressing mechanism. By means of the device, deformation of welding, clamping and assembling can be reduced to a large extent, effective limitation of six degrees of freedom of