Intelligent electric control system design for mine horizontal directional drilling rig
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摘要: 针对国产水平定向钻机电控系统存在智能化程度低、功能单一、安全性差等问题，设计了一套矿用水平定向钻机智能化电控系统。该系统主要由微处理器、电压电流检测模块、安全栅采集模块、漏电闭锁模块、漏电流检测模块和先导模块组成。安全栅采集模块通过开关量安全栅、模拟量安全栅、热电阻安全栅进行限压限流和故障隔离，提升信号采集精确度和信号采集过程中的安全系数；漏电闭锁模块采用外加直流电的方法检测电动机对地等效绝缘电阻，将计算出的电阻值与漏电闭锁动作电阻的整定值比较，实现电动机漏电闭锁故障的切除；漏电流检测模块采用外加零序电流互感器的方法在线检测回路中的漏电流，经处理器分析判断后，达到快速切除漏电故障的目的；先导模块除了可实现远程控制功能外，还可在满足本质安全性能的基础上对故障信号进行采集，有效减少误动作。测试结果表明：该系统实现了电动机远程和就地启停控制及远程先导保护等基本功能；电流采集精度高，误差小于2%；故障识别准确，漏电闭锁保护和过载保护动作准确、可靠。Abstract: In order to solve the problems of low degree of intelligence, single function and poor safety of electric control system of domestic horizontal directional drilling rigs, an intelligent electric control system for mine horizontal directional drilling rig is designed. The system is mainly composed of a microprocessor, a voltage and current detection module, a safety barrier acquisition module, a leakage blocking module, a leakage current detection module and a pilot module. The safety barrier acquisition module uses switching safety barriers, analog safety barriers, and thermal resistance safety barriers to limit voltage and current and obtain fault isolation so as to improve the accuracy of signal acquisition and the safety factor in the signal acquisition process. The leakage blocking module adopts the method of applying direct current to detect the equivalent insulation resistance of the motor to ground, and compares the calculated resistance value with the setting value of the leakage blocking action resistance to realize the removal of the motor leakage blocking fault. The leakage current detection module adopts the method of applying a zero-sequence current transformer to detect the leakage current in the circuit online. After the analysis and judgment by the processor, the module achieves the purpose of removing the leakage fault quickly. The pilot module not only realizes the remote control function, but also collects the fault signal on the basis of meeting the requirements of intrinsic safety performance so as to reduce the misoperation effectively. The test results show that the system realizes the basic functions of remote and on-site start-stop control of the motor and remote pilot protection. The current acquisition accuracy is high and the error is less than 2%. The fault identification is accurate and the leakage blocking protection and overload protection actions are accurate and reliable.
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