| At present, the mine hoister electrical control system in domestic is consisted of relays,contactors,and other contact devices,poor system control precision with a large quantity of maintenance.The hoister electric drive system adopts the manner of AC motor rotor in series with resistances,speed control is not smooth,and the comfort is low.To adapt the demand for automation and high-performance operation of the mine hoister control system,the author has transformed the 3rd mine hoister electrical control system of Song Mine belongs to Yunnan Tin Group.Including the improvement of 3rd mine hoister speed control system and control loop,development of PC monitoring software and design of video surveillance system.After the improvement,the speed control system adopts the manner of VWF,it can reduce energy consumption,also improve stability of hoister operation.Control loop adopts the manner of PLC,reliability of the system and the control accuracy have been increased greatly.PC monitoring software was programmed under the environment of Visual C++,through the communication between PC and PLC,it can show the operating parameters on the interface.These operating parameters contain given speed,actual speed,armature current,hydraulic oil pressure,hoister position,fault alarm display and protection of safety circuit.These can make users realize the operation of the mine hoister clearly. According to the situation,the video surveillance system make the video signal received by CCD be inputted to the Video Capture Card,through the transmission medium.The video surveillance system can capture and display the video through the video capture module of the PC monitoring system.Users implement monitoring according to the video.Through the design of improvement, the security and stability of 3rd mine hoister belongs to Song Mine will be improved greatly. The safe and reliable monitoring system not only make sure mine production be working well, but also ensure the personal safety, it will bring plenty of economic and social benefits to the corporation. |
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