Development of remote control system for automatic drilling rig used in coal mine

In response to the problems of high labor intensity and great safety risk of drilling rig under the complex construction environment, a set of remote monitoring system for automatic drilling rig of coal mine was developed using the electronic circuit, measurement sensing, remote control, video monitoring and big data technologies. The system, based on ZDY4500LFK coal mine drilling rig, has implemented the three control modes: in-line-of-sight control, underground centralized control and ground remote monitoring. Besides, a cloud automatic drilling rig management and control platform was established. Specifically, the in-line-of-sight monitoring is used to realize the accurate operation of drilling rig in the downhole visual range by means of telecontroller, controller and supporting sensors. The underground centralized control mode has the centralized control cabin, flameproof and intrinsically safe computer, intrinsically safe display, flameproof and intrinsically safe switch, intrinsically safe camera and intrinsically safe control box integrated to realize the remote monitoring of drilling rigin underground dangerous drilling field. The ground monitoring mode provides strong support to the ground remote monitoring of automatic drilling rig with the ground control console, ground server, display, switch, AI intelligent analysis box, etc.. In addition, the cloud automated rig management and control platform is mainly used for the data statistics and analysis of the operation and construction status of the automatic drilling rig group. The remote control system developed is applicable to the drilling rigs such as ZDY4500LFK and ZDY6500LDK for the stable operation in various control modes, including in-line-of-sight control, underground centralized control and ground remote monitoring. The results of field test and testing show that: (1) The in-line-of-sight control system has the telecontroller equipped with abundant buttons, the controller designed with rich interfaces such as CAN and RS485, capable of being rapidly and conveniently upgraded by mobile phone. Hence, it can be widely used in the electronic control upgrade and transformation of the drilling rig. (2) The remote centralized control system can achieve the remote control at a distance of 10km, with the control response time less than 200 ms. In particular, the video and parameter acquisition data respond in time without delay, which could meet the needs of remote monitoring of underground drilling rigs. (3) The ground remote monitoring system could realize the remote monitoring of the ground drilling rig and has the AI identification function, which could realize the early warning of personnel intrusion and shutdown. (4) The automatic drilling rig management and control platform has been tested by function, pressure, parallel and access, with normal function, timely response and no system crash. Thus, it can be used for the statistical analysis of data and working conditions of the automatic drilling rig. Generally, the application of the control system not only ensures the safety of drilling construction, but also provides a reference for the realization of less human, intelligence and informatization of coal mine drilling rig.