The huge tube expander for heat exchanger of air con ditioner and refrigeration system are developed first by our institute after stu dying for a long time . the tube expanding from manual - operation to automatic - oper ation is solved to keep fin at a large distance 在我院多年开发胀管机的基础上，首次研制成功空调制冷换热器超大型胀管机，解决了大片距换热器由手工胀管转变为机械胀管的难题。
