对于各种机械化上卸管柱的工具,如钻井用机械化大钳旋扣器,修井用电动或液动油管钳,合理地设计钳头部分的结构,往往是整个工具成败的关键。钳头要有适应各种不同尺寸管柱的大的使用范围,要有足够的强度以保证所需传递的扭矩,要能够在牙板磨损、管柱偏磨及油、水、泥侵入钳头等复杂条件下正常工作。特别是钳头结构要保证大钳能可靠地咬紧 For a variety of mechanized on the pipe string tools, such as drilling mechanized tongs rotary buckle, workover with electric or hydraulic tubing clamp, the rational design of the structure of the first part of the clamp is often the key to the success of the entire tool. The clamp head must have a wide range of applications to adapt to different sizes of pipe string, have enough strength to ensure the required torque transmission, to be able to wear the tooth board, pipe partial wear and oil, water, mud invade pliers Working under complicated conditions. In particular, clamp head structure to ensure that the jaws can be reliably clenched