Heat preservation structure for preventing frosting at joint of cold box plate of air separation equipment

The invention relates to a heat preservation structure for preventing frosting at the joint of a cold box plate of air separation equipment. The heat preservation structure is an extending type, and is composed of a perforated straight pipe, a sealing ring plate, a zipper type rubber sleeve and a hose clamp, wherein the perforated straight pipe is welded to the cold box plate, one end of the perforated straight pipe is connected with a vacuum pipe on the outer side of the cold box plate through a zipper type sleeve with the stainless steel hose clamp, the other end of the perforated straight pipe is used for sealing a low-temperature pipe on the inner side of the cold box plate through the sealing ring plate, and a heat insulation filling material is further arranged in the perforated straight pipe. According to the heat preservation structure, the structure is simple, the cost is low, through the structure, perlite in the cold box can smoothly enter the heat preservation structure through small holes, meanwh