The transmission of this machine is mainly designed for the transmission structure of large pipe diameter and long pipe; Reduction gearbox adopts multiple sets of gears with large gross number, which are connected to the motor and formed into one set of gear reduction motors with large torsional distance, which can avoid the trouble of insufficient transmission force or easy damage to the motor caused by shrinking large tubes and long tubes. In the middle, a double universal shaft is used to connect the motor with the rolling roller shaft, so that the machine can drive in parallel and the torsion distance is increased, thus reducing the direct stress between the motor and the rolling roller shaft and protecting the reduction motor. A; Shrinkable pipe diameter range: 3-30 (mm); B; Shrinkable pipe length: 120-10000 (mm) C; Machine structure classification: integral casting, split combination D; Group number; Groups 8, 10, 12, 14, 16, 18 E; Die material: alloy, high speed steel, die steel F; Shrinkage speed: from 10-20 (m/min) G; Volume product (length * width * height) (mm) 1500*1200*1300(mm)