The control rod string which is consisted of pumping rod and controller is tripped into the release string.
抽油杆与控制器组成的控制杆柱下入到丢手管柱内，控制杆柱上部与杆式泵的进油孔相连。
A pumping rod housing lock joint of a screw pump is primarily used to resolve the problem that the current screw pumping rod joint is easy to release.
一种螺杆泵抽油杆防脱扣接头主要解决现有螺杆泵抽油杆接头易脱扣问题。
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