接箍类双旋转型扶正器
Double Rotary Coupling Centralizer

    本结构产品是由一端为抽油杆外螺纹，一端为抽油杆内螺纹，在其中间的实体部位上，通过压盖连接形式，分别将扶正件连接在上下两端，在杆体中间留有旋入搬手空间的整体结构产品。

      The product is a special pup joint for sucker rod processed through
hot forging, upsetting, hardening and tempering. both ends of the
joint are processed through cold extrusion and rolling. One is externally
threaded, the other is internally threaded or both are internally threaded.
     A centralizing element of different shapes is moulded around or wedged in the middle part of the pup joint with special technique which can revolve round the joint.