Rapid preparation equipment for mold-free composite formed sand blank

The invention discloses rapid preparation equipment for a mold-free composite formed sand blank. The rapid preparation equipment comprises an upper mold, a lower mold, a sand box, an amine blowing mechanism, a first moving mechanism, a second moving mechanism and a control mechanism; the upper mold comprises an upper mold frame and an upper mold bottom plate moving in the upper mold frame; the lower mold comprises a lower mold frame and a lower mold bottom plate moving in the lower mold frame; wherein the amine blowing mechanism comprises an amine blowing hole, and the amine blowing hole is formed in the upper mold or the lower mold; the first moving mechanism drives the upper mold bottom plate to move in the upper mold frame so as to adjust the height above the sand box after mold closing; the second moving mechanism drives the lower mold bottom plate to move in the lower mold frame so as to adjust the height below the sand box after mold closing; and the control mechanism controls the first moving mechanism