1. Cold frame uses the heat source of sunlight to create a seedbed suitable for seedling growth temperature under the enclosure and transparent covering equipment within a certain range. 2. The cooling bed is a worktable for the metallurgical steel rolling industry to effectively cool the rolled products (threaded steel, round steel, steel pipe, etc.). The cooling bed is composed of mechanical transmission system, water cooling system, working table of cooling bed, fixed support, etc. Cooling beds mainly include tooth pulling cooling bed, rack stepping cooling bed, claw type cooling bed, carrying chain type cooling bed, roller type cooling bed, etc.