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。

youdao

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；

youdao

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。

youdao

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。

youdao