Special precoated sand outer housing for manufacturing walking machinery motor cover

The utility model discloses a special precoated sand outer housing for manufacturing a walking machinery motor cover. The special precoated sand outer housing mainly comprises an upper mold and a lower mold in a mold clamping manner, wherein the upper mold is in a structure which imitates a motor cover face structure, the upper mold is provided with a casting head, and the casting head is formed in the central part of the upper mold; and the lower mold is in a structure which imitates a motor cover bottom structure, the bottom surface of the lower mold is provided with one or more windows with a large area, and a cold iron block is attached to each window. The upper mold is a structure which imitates the motor cover face structure, and the lower mold is a structure which imitates the motor cover bottom structure, and the casting head is formed in the upper mold; because of the structure of the motor cover, the structure is rightly suitable for the use of molding flow lines, and the practicability of the outer housing is improved; and the cold iron block is arranged on the lower mold, so as to plays a role of quickly cooling castings after melted iron is cast into a mold cavity, so that the sand hole rate of the castings is reduced, the quality is improved, and the oil leakage of the castings during the using process is prevented.