It mainly consists of an organic seat, a frame, a roller, a transmission gear, a roller distance adjusting device, a safety brake reversing device and a motor reducer. The roller is made of chilled alloy and its surface is polished to a smooth surface. The inside of the drum is hollow, and the temperature of the drum can be adjusted by introducing steam or cooling water according to the use requirements. The frame adopts Korean technology and is welded with H-beam, which is heavy-bearing, never broken and beautiful. The frame is made of HT200 cast iron, which is machined and scraped by workers. The reducer and transmission gear are produced by famous brand manufacturers, with wear-resistant tooth surfaces and low noise. The distance adjusting device adopts worm gear and worm drive, which makes the distance adjusting force large and convenient.