square drive roller kelly bushing

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square drive roller kelly bushing
Posting date : Jun 21, 2008
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82-
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the square drive roller kelly bushing provides the following advantages: 1. pulling out or feeding off string can be done while rotating; 2. because fo its integral construction , it can not fly out and hurts you, 3. the bushing is easily installed into the master bushing, maintaining good alignment; 4. the contact between kelly and roller is rolling contact, so friction is lower, and weight on bit is accurate; 5. the kelly has lower wear and has long life; 6. labor condition is improved ,and penetration rate is faster; it is bottom seat of the kelly bushing with cover is made up of cover and lower seat. there is rooling bearing between roller and roller pin. msn xiaoyouloveyou@hotmail.com

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