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。
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。
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。
Ring-Mounting machine is mainly used for mounting the reference-positioning ring to the tool and removing the ring from it on numerical controlled drill, fraise machine for etched circuit card.
装圈机主要用于印制电路板数控钻床，铣床加工刀具装上，卸下基准定位环只用。
The paper mainly introduces the design method of power supply and earth-leakage circuit for the electric-coal-drill integrated unit.
本文主要介绍煤电钻综合装置电源与漏电保护电路的设计方法。
This paper systematically introduces the composition and principle of a self-design and manufactured miniature nc drill machine's control system used for processing printing circuit board.
本文系统地介绍了自行设计与制造的加工印刷电路板微型数控钻床控制系统的组成及原理，并对各部分功能进行了分析。
When processing, if the stable time is obtained, the drill can be moved on Z-axis direction, and can be cut into printed circuit board.
在加工时，一旦经过获得的稳定时间后，钻便在Z轴方向上运动以切入印制线路板。
When processing, if the stable time is obtained, the drill can be moved on Z-axis direction, and can be cut into printed circuit board.
在加工时，一旦经过获得的稳定时间后，钻便在Z轴方向上运动以切入印制线路板。
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