...（Rotating Prevent），靠密封胶芯与钻具之间的保持一定过盈密封钻具与井壁之间的环空的称为旋转控制头（Rotating control head）。旋转防喷系统是欠平衡压力钻井关键的安全保障设备，属高压设备．工作条件恶劣，可靠性要求非常高。
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In the process of drilling, the rotating control head is often damaged by the lateral force of the kelly, and this may lead to serious accident.
在钻井过程中，方钻杆的侧向力作用常常导致旋转控制头损坏，造成事故。
Disclosed is a mold head apparatus of a spring molding machine, comprising a rotation control mechanism, a straight-line moving mechanism, a rotating head and a mold head;
一种弹簧成型机的模头装置，包括有一旋转控制机构、一直线运动机构、一旋转头与一模头；
The electric toothbrush comprises a protecting cover, a rotary brush head, a rotating shaft, a power handle and a control switch.
它包括保护罩、旋转刷头、转轴、动力手柄和控制开关。
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