缩短有杆泵的冲程长度可有效地减小抽油泵的排量。通常所用调节抽油机冲程长度的方法,不仅费工费时,而且还要使油井停产后才能进行。这对一些出砂井是不允许的,并且这种方法还有一个很大的缺点,就是不能均匀地、只能间隔分级地减小有杆泵的排量。为了克服上述的不足,前苏联新近研制出一种可以均匀缩短有杆泵冲程的装置。该装置是在原先的标准悬绳器上下夹板间添加一个特种弹簧及其它附件。 Shortening rod stroke length can effectively reduce pump displacement. The commonly used method of adjusting the stroke length of a pumping unit is not only laborious and time-consuming, but also allows the well to stop working. This is impermissible for some sand wells and there is a significant disadvantage of this method in that the displacement of the rod pump can not be reduced evenly, only at intervals. In order to overcome the above deficiencies, the former Soviet Union has recently developed a device that can uniformly shorten the rod pump stroke. The device adds a special spring and other accessories between the upper and lower plywood of the original standard suspension rope.