安装蹄片上部和下部返回弹簧。使用针针嘴钳连接弹簧至每个蹄片。操作拉杆确认蹄片放开和收回正确。

Install shoe upper and lower return sprinNeedle nose pliers can be used to connect spring to each shoOperate lever to verify that shoes expand and retract properly.

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连接猫头绳和钳尾绳到大钳上。

Connect the makeup line (s) and snub line to the rig tongs.

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结果表明，断裂是由于热处理工艺不当、管子钳活动钳口齿部、螺纹部以及螺纹和齿部的过渡连接部分硬度过高引起；

The results show that the fracture may be due to improper heat treatment which leads to over hardness of the thread part and the joint of thread part and tooth part.

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