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换向机构是滚筒式抽油机的主要部件。无切换换向机构是在分析以往滚筒式抽油机机械换向机构的基础上设计出的一种新式换向机构。它的主要原理是采用大摆角正反转的曲柄－齿轮、齿条换向机构，把电动机的旋转运动转变为小齿轮的往复摆动；小齿轮的往复摆动可通过滚筒、柔性件及天车轮转变为悬点的上下直线运动。介绍了这种换向机构的结构特点、运动及动力分析情况。采用这种换向机构设计出了滚筒式抽油机。分析、计算及设计实例表明，无切换换向机构对减少和消除滚筒式抽油机换向时引起的冲击是十分有效的。由于在换向机构内增加了减速齿轮，所需减速器的尺寸也相应减小。采用这种机构设计出的滚筒机具有结构紧凑、重量轻及减速器寿命长等优点。
The reversing mechanism is the main part of the drum pumping unit. The switching mechanism without switching is a new type of reversing mechanism designed on the basis of analyzing the mechanical reversing mechanism of the drum pumping unit in the past. Its main principle is the use of large swing angle positive and negative crank - gear, rack reversing mechanism, the motor rotation into pinion reciprocating swing; pinion reciprocating swing through the drum, flexible parts and days of the wheel Change to a straight line up and down motion. The structural characteristics, movement and dynamic analysis of the reversing mechanism are introduced. The use of such a reversing mechanism designed drum pumping unit. The analysis, calculation and design examples show that the switchless mechanism is very effective in reducing and eliminating the impact caused by the reversing of drum pumping unit. Due to the increase in the reversing gear reduction gear, the required reducer size is also reduced. The drum machine designed by this kind of machine has the advantages of compact structure, light weight and long service life of reducer.