目前，煤矿井下使用的煤电钻综保开关的开关器件大多为交流接触器，动作时易产生火花，开关体积大而且笨重，保护功能单一。随着煤矿生产自动化程度的提高，对煤矿井下煤电钻综保开关设备的性能和保护提出了更高的要求。因此研制安全可靠的新型矿用开关具有重要的意义。 本文研究的矿用新型煤电钻开关是以固态继电器作为开关器件，以AT89C51单片机为控制器，采用过零触发技术，实现快速、无触点开断的煤矿新型智能开关。本文的硬件设计包括：信号采集模块、单片机控制模块、液晶显示电路、显示模块以及固态继电器开关控制电路。软件设计包括：主程序、中断子程序、数据采集子程序、液晶显示子程序等流程图。 最后对整个装置的硬件、软件进行了调试。调试结果表明：本文所设计的智能综保开关达到了预期的目标，验证了本设计的可行性。

At present,the switch device of electric hand drill for coal and intelligent integrated protector used in coal mine is almost contactor.Spark is easily produced when this device works. This device also has followed setbacks,such as large、unwieldly and poor capacity.With the improvement of automation in coal production, we place higher demand for the performance and protection of the device of hand drill for coal and intelligent integrated protector in coal mine.Therefore,it is primary importance in developing new switch device of coal with guarantee of safety. The new electric hand drill which is studied in this paper uses Solid-state relay as switching element and uses AT89C51 as its controller.Through the technology of triggering by passing zero,we can complete the design of nontact switch. The hardware design involve in designing of signal gather module、the chip microprocessors controlling module、disply module and Solid-state control module.The software design involve in designing of the mainline program、interruption sobroutine、data acquisition sobroutine and LCD subroutine. Finally,the paper debug both of the sofeware and the hardware.The result of the test indicate that the switch device of hand drill for coal and integrated protector achieve the desired result and verify the feasibility.