Floating fixture for welding upper cover plate and annular inner cavity of annular water jacket

The utility model provides an annular water jacket upper cover plate and annular inner cavity welding floating clamp which comprises a large supporting plate, a horizontal positioning module and a vertical positioning module, wherein the horizontal positioning module and the vertical positioning module are used for conducting horizontal positioning on an annular water jacket upper cover plate to be welded and an annular inner cavity to be welded. The horizontal positioning module comprises a spring positioning pin mechanism arranged in the foresight direction of the large supporting plate, an X-direction limiting mechanism arranged at one side end of the large supporting plate and a spring pin ejection mechanism arranged at the other side end of the large supporting plate. By means of the floating clamp for welding the upper cover plate and the annular inner cavity of the annular water jacket, the machining process of welding and fixing of the joint of the upper cover plate and the annular inner cavity can be