Sliding bearings are made of high quality alloy cooper, thus to get effect of anti-friction and shake reducing.Flywheel is with big moment of force and large pressure. High strength due to one piece casting by using top-ranking material for machine body.Single plate electromagnetic clutch is sensitive and reliableWith functions of single, continuous and opening dwell operation, dwell range is adjustable. Operating position is reasonably arranged, moving-bed can be opened to its optimum. Safety system is reliable.Can equip inner and outer movable frame.