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1·The control part of tube expander adopts the structure of double bearings.

它的控制部分采用双轴承结构。

2·The huge Tube Expander for Heat Exchanger of Air Conditioner and Refrigeration System are developed first by our institute after studying for a long time.

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。

3·The working principle of boiler tube expander is elaborated and the formula for calculating the related parameters is derived in this paper according to the theory of mechanics of rigid body.

本文运用刚体力学理论阐明了胀管器的工作机理，并导出相关参量的计算公式。

4·The principle of ultra - high pressure hydraulic tube expanding technology for liquid bag type expander is addressed in this article anddeveloping process for this new equipment has been discussed.

本文论述了液袋式超高液压胀管技术的原理和液压胀管新设备的开发。