钻机传动装置广泛采用滚子传动链条。由于链条的工作条件很繁重(负荷达20000公斤力,线速度达20米/秒),加上在现场条件下更换零件有很大困难,故对钻机传动链条的可靠性要求很高,直到现在,传动链条的最薄弱环节仍是中间链板。因此,21834—76《钻机滚子传动链条》中对中间链板的持久强度作了详细规定。根据的规定,按5×10~6次循环进行计算的应力极 Drill gear widely used roller drive chain. Due to the heavy working conditions of the chain (load up to 20,000 kg, line speed up to 20 m / s) and the difficulty of changing parts under field conditions, the reliability of the drive chain of the rig is so demanding that until now , The weakest link chain is still the middle link plate. Therefore, 21834-76 “rig roller drive chain” on the long-lasting strength of the middle chain made detailed provisions. According to the provisions of 5 × 10 ~ 6 cycles calculated stress pole