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作者根据石油钻机常用气动元件的结构和工作原理,按国家标准GB786-76中的规定,绘制其图形符号。并以这些图形符号重新绘制出大庆I-130钻机气控流程图。
According to the structure and working principle of the commonly used pneumatic components of oil drilling rigs, the author draws the graphic symbols according to the provisions of the national standard GB786-76. And with these graphic symbols to re-draw Daqing I-130 rig pneumatic control flow chart.