The kelly is used to transmit rotary motion from the rotary table or kelly bushing to the drillstring, while allowing the drillstring to be lowered or raised during rotation.
方钻杆用于传递转盘或者方钻杆补心的旋转运动到钻柱上去，并允许钻柱在上提或下放的过程中旋转。
Single-screw pump is a new volume of the inner rotary gear pump. The main working parts are eccentric screw (rotor) and fixed bushing (stator).
单螺杆泵是一种新型的内啮合回转式容积泵。主要工作部件是偏心螺杆（转子）和固定的衬套（定子）。
The utility model relates to a square bushing for measuring the torsion of a rotary table in the process of drilling Wells, which belongs to an appliance of well drilling equipment.
本实用新型是一种在钻井过程中测量转盘扭矩的方补芯，属于钻井设备的器具。
The utility model relates to a square bushing for measuring the torsion of a rotary table in the process of drilling Wells, which belongs to an appliance of well drilling equipment.
本实用新型是一种在钻井过程中测量转盘扭矩的方补芯，属于钻井设备的器具。
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