The problems in leakage protection and executive circuit of synthetical protection set in coal electric drill have been analyzed and calculated.

通过分析和计算说明老式煤电钻综合保护装置在漏电保护和执行电路中存在的问题。

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RD auto pinning machine is used to make reference positioning pin prior to drill the laminated plates of etched circuit ca rd on drill machine for etched circuit ca rd manufacture premium products.

rd 全自动钉销机用于印刷电路叠层板在印制电路板数控钻床钻孔前钻作基准定位销钉，从面保证印刷电路板数控钻床能加工出高品质的产品。

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Finish the pneumatic design of all the functions of hill-drop drill, and produce the pneumatic circuit drawings.

对气动部分的各种功能进行了设计，并绘制出气动回路图。

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