机械胀管 meaning in English

mechanical expanding of pipe

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。