The working principle of the up-and-down sand-shooting molding machine is to use the sand adding method of air suspension from top to bottom and sand from bottom to top to complete the sand adding process, which solves the problem of sand shooting shadows on castings with complex shapes or high heights problem.

Each of the upper shooting board and the lower shooting board has multiple sand shooting nozzles, which are evenly distributed on the top board and the floor. The sand nozzle can also be adjusted in any position at the same time according to the shape characteristics of the mold and the depth of the suspended sand mold.

The upper and lower sand injection molding machine solves the shortcomings of the inconsistent sand mold hardness caused by the uneven sand molding machine of the previous side shot molding machine. The mold plate with the deep hanging sand shape can also be molded, and the dimensional accuracy of the castings can be improved. Innovative design that completely replaces artificial modeling.