The reinforced polypropylene plate is moulded. Smooth surface, high strength, light weight, acid and alkali resistance, corrosion resistance, non-toxic and tasteless. The frame adopts high strength steel welding joint, high strength, stable structure and long service life. It is equipped with automatic drawing board, automatic solution, PLC automatic control, simple and safe operation, and equipped with a variety of safety devices. The guide rail of the main beam is equipped with a molded anticorrosive stainless steel track.