Outer wall heat preservation structure of vacuum drying tank

The outer wall heat preservation structure of the vacuum drying tank is characterized in that the vacuum drying tank comprises a vacuum tank door, an in-tank heating calandria, an air duct, a tank wall, a tank bottom, a tank top, mineral rock wool and aluminum foil, the mineral rock wool is arranged on the inner side of the tank wall and is in a plane plate shape, the aluminum foil is arranged on one face of the mineral rock wool, grounding pieces are arranged on the periphery of the aluminum foil, and the grounding pieces are connected with the air duct. The grounding piece is an extension outside the aluminum foil, the grounding piece is in a long strip shape, a riveting hole is formed in the tail end of the grounding piece, through the aluminum foil with the grounding, on one hand, the effects of saving energy and reducing consumption are achieved, on the other hand, the effect of providing a grounding point is achieved, and the purpose of the peripheral extension grounding piece is that when a vacuum tank