Technology of On-line Full-automatic Inspection and Straightening of Drill Pipe Straightness Blind Area

Addressing the shortcomings related to the method of manual inspection and straightening of drill pipe straightness blind area, an on-line full automatic inspection and straightening technology is proposed, which is based on the multi-displacement transducer, pressure straightener and operation controller, etc. Studies are conducted to the system mathematic model and the structure and the inspection and straightening algorithm. The operation practice has proven that owing to the high efficiency and accuracy and consistency as provided by the said technology, the chronic technical difficulty concerning inspection and straightening of drill pipe straightness blind area has been tackled.