Abstract: This paper introduces a PLC-based centralized monitoring all mine belt conveyor system, which set the scene controller and a control master station, set up a CC-LINK communications network, and equipment on the belt conveyor system, centralized control CRT made to improve production efficiency and reduce on-site operators, improve the security of good results. A71 Introduction Coal belt conveyor control system safe and reliable direct impact on whether or not the economic benefits of mine. To enhance system reliability and security, the implementation of centralized control, to achieve comprehensive system protection and centralized control, it is very necessary.
Tangshan open and Electric Co., Ltd. focus on the production of intelligent control and monitoring of belt conveyor systems are used in mining belt transport automated high-tech products, this system is based on "Coal Mine Safety Regulations" as the basis of summing up the pits during the accident occurred , in line with safe, practical and has the characteristics of advanced research and development of a new generation of integrated control system. Centralized control systems and scheduling phone systems, industrial TV system together with a complete operation, scheduling, monitoring networks, realize the whole system of telemetry, remote, remote control. The system can increase productivity, reduce the accident rate, reduce troubleshooting time, reduce on-site operators, increase economic efficiency. Description of Control System A72 Currently, PLC is always in the field of industrial automation and control the main battlefield for a wide range of automation control equipment provides a very reliable control applications. The main reason is that it can provide a safe and reliable automatic control applications and more complete solution for automation of industrial enterprises in the current need. In the field of global industrial computer control, process control systems around the open, open process control software, open data communication protocol, great changes have taken place. With the PLC (SoftPLC) birth control configuration software technology and to further improve and develop configuration software installed SoftPLC PC-based industrial process control systems are gradually developed. The control software, this is a PLC controller core, to the industrial users of open programming configuration tool. In addition, open communication network technology has also been a breakthrough, the result is the PLC into the more open industrial automation and control. The system uses fully distributed control structure. Console from the underground control station and integrated form. Integrated Operations Center located in the central control room floor. System uses the Japanese Mitsubishi Electric Corporation AnS and FX series PLC, the main control station and control Sub-station network with Ryoden open bus architecture CC-Link, control sub-station and sensor connection between the use of Inmerse Matrix structure, control of the main station monitoring and integrated console controller via the CC-Link bus network connection. Control Sub-station equipment for field data acquisition and control, through the monitoring device can monitor the whole system and centralized control. The system is based and the FX series Ryoden AnS PLC as main control component, a moisture-proof, anti-interference ability, on-site easy to program, easy to expand, basic maintenance, and to achieve control of the software to automatically detect system failures and so on. PLC system is composed of multiple data transmission network, to a different scale control. Completion of a multiple belt system to monitor the whole process, monitoring, together with the ground command station management center to form a complete monitoring system. A73 Network Taking into account the situation and control of coal mine site from the ground control center set up control of the main station, with Mitsubishi s large and medium-PLC-AnS series, the network used open CC-Link bus, the control of more than 1200 meters away from the two controllers room to add repeaters, set up in the head belt control device sub-station. Control equipment for on-site sub-station signal acquisition and real time control of the scene. System for real-time monitoring network, with a sound monitoring and management functions of production, the main part of the belt transport links and related supporting the production of real-time data acquisition, transmission, processing, display, log printing, the transport belt system on the remote underground centralized monitoring, in conjunction with industrial television systems for security video surveillance, to ensure the safety of personnel and equipment. Monitoring network implementation, the operator terminal in the control room monitor control on the transport belt production process, complete the relevant part of the transport belt production and the "telemetry, remote and remote control" of a mine transport belt production system integrated automation. 1. Real-time monitoring of operating parameters. The production control system real-time acquisition and operation parameters and can use graphics, reports, real-time display system in the form of conditions and the current production, storage and so on. 2. Real-time process control. Analysis of acquisition parameters, the system will automatically complete the process control, or operational control by the operator. 3. Historical data query. AboveProduction of real-time monitoring data real-time data can be stored in the production history database, enabling the echo of history, historical trend analysis, and histograms, pie charts, etc. were analyzed. 4. Equipment failures and analog over-limit alarm. When equipment failure or analog gauge, the production monitoring and management of network synchronization failure device display name, and may voice alarm, real-time printing fault function. Server failure the fault information into database for later statistical analysis. 5. Optimize production planning. Server in the network established a comprehensive historical database, timing of production, business operation data into the database, production planning, production and completion of the trend analysis charts, production plans for the future reference; Sinotrans issued under the plan and the actual state of equipment , storage of coal capacity, rationalize production planning, equipment maintenance program to minimize the impact on production. A74 Operator Workstation Function under the control subsystem, in the monitoring center set up workstations, transportation system monitoring stations of their functions:
1. According to different operators, set different permissions, perform their duties;
2. To provide an interactive platform for all Chinese operation interface, each subsystem visual equipment operation status and parameters of dynamic display;
3. According to relations between process and interlocking subsystems of automatic / manual / local control;
4. Time to set various operation parameters of the production process;
5. Real-time monitoring of all subsystems of equipment operating parameters and status, while the parameters of the data stored on your hard drive, upload the necessary data to the data server; 6. Real-time sensors to monitor the current status of all subsystems and parameters; 7. On the various equipment and the necessary real-time sensor fault alarm state, alarm mode for the sound and light alarm. And printing real-time alarm, while alarm data storage into the data server to facilitate unified management information to accident analysis on the alarm; 8. Any query, printing real-time trends and historical trends in any time period; 9. Any query, print reports of historical data any time. A75 engineer station Engineer station except with the operator workstation for all functions, also has the following features.
1. According to the adjustment process control procedures online changes to suit the needs of new technology;
2. The control system to convert the data into all mine information management systems;
3. Set color printers, print color images in real time and color of the trends;
Four. When a subsystem failure of the operator workstation, the operator can immediately by setting permissions, will be converted into the subsystem engineer station operator workstation. A76 belt transport monitoring system The system consists of the transport belt machine, to coal and other basic equipment, which uses the control equipment, communications module, slip, stacking, over temperature, smoke, longitudinal tear, dust off, speed, deviation, coal and other protected places, to belt centralized control and monitoring systems. PLC system is composed of multiple data transmission network, to a different scale control. Complete belt system, to the coal machine s entire work process control, monitoring, together with the ground in the control room, form a complete monitoring system.
1) The realization of the belt conveyor system centralized monitoring, real-time monitoring equipment status and operating parameters, and display the data curve, important information on the hard disk recording;
2) Control mode diversity controlled automatic / manual control set / place, three ways to convert. Normal production, the use of centralized control automated equipment according to process requirements and process the order automatically start and stop by the center console; set of manual controls, it can operate the equipment in the central console, no lockout and linkage relations; place when operation in the field;
3) start the equipment before the notice issued by the central control station signal after 30 seconds notice, if the site were automatically activated to meet the conditions of centralized control, equipment, automatic start sequence. On-site parking available button to stop the boot process;
4) The scene from the signal box set / stop button, on-site parking at any time. If the device starts from the central control, the control system stops receiving on-site parking number, can be used for emergency stop processing, the implementation of failure stop operation;
5) Press the "technical requirements" pull the cord belt conveyor installed, deviation protection, low-speed protection, these signals are set access control system, to participate in the emergency equipmentParking and closed parking;
6) of the equipment failure and abnormal parameters of real-time alarm, and make sound and light tips. General fault alarm only, on-site parking or serious non-normal faults, fault emergency stop device and the upstream equipment, downstream equipment, closed parking along coal flow delay. 6.1 The main function
1. Each device are equipped with head next to the local operator control box, switch on the way to work and start-stop button on the spot;
2. All the tape machines on the coal points were set up to protect and longitudinal tear of coal heap protection to prevent the spreading of tape machine accident;
3. All tape machines are equipped with two poles deviation switch, set at intervals of about 50 meters from a pair of wandering switch, a deviation for fault alarm, two parking deviation for fault;
4. All tape transport aircraft, are equipped with pull switch for emergency parking, emergency stop pull switches are determined by the installation of 50 meters spacing configuration, and can extend the protection under the belt of deviation to ensure that equipment and personal safety ;
5. Speakerphone, selection using the new telephone system, installed by 200 m spacing to determine configuration;
6. The level of the belt conveyor tensioning device for the hydraulic adjustment method, open and provide a loose belt conveyor belt detection sensors, controlled by the PLC to complete the belt conveyor tension adjustment mechanism;
7. Set the heap of coal in the belt sensor head to prevent the belt of the heap of coal accidents;
8. The belt conveyor belt speed sensor set to detect speeding and skidding belt accident;
9. Smoke sensor in the belt tunnel set up to detect the smoke concentration to prevent the belt tunnel fire accident;
10. In the main drum belt conveyor equipped with a temperature sensor, the temperature at any time detection roller, and is equipped with an automatic fire sprinkler installations, the drum-temperature when the automatic sprinkler and cool the main drum;
11. Belt conveyor located about every 100 meters starting early warning devices, equipment, early warning signals before the start, suggesting that the officers concerned shall immediately away from the equipment;
12. Motor function of current real-time monitoring of some mechanical equipment can be found hidden potential failure; operation of the motor current in real-time monitoring and analysis, when the mutation occurs when the current limit or alarm, serious downtime.
13. To realize the coal feeder and the belt latch, latch belt to achieve with the previous function, automatic, manual and repair of control;
14. In the software and hardware development of advanced matrix of control functions, the main cable to save expenses;
15. Control System in the performance of good heat resistance, anti-interference, the structure can meet the conditions in the underground rapid repair or replacement of components, according to Mine-site environment, the control box of stainless steel, the other with anti-corrosion measures ;
16. Conveyer system according to the nature of the fault, emergency stop, stop, or the order of sound and light alarm signals;
17. In the centralized operation platform to focus on working conditions show tape machines, fault type, fault location;
18. Flameproof or explosion-proof soft starter include inverter control;
19. A variety of operating methods. Control methods are: focus on interaction, focus manually, local interaction, local manual, since prohibition, etc., the system is flexible and reliable. In the centralized approach, all the equipment from the central control room operator through the PC operation;
20. A variety of process options. In the interaction mode, the transport process in accordance with process selection, start by tape along the direction of coal flow and, based on tape speed, driving the length of delay, to reduce the running time; overload starts, press start against the flow direction of coal; system to stop or automatically stop when the delay without coal;
21. Comprehensive information processing functions, alarm information, operational parameters, operational records and other information automatically form a standard format of the database file and hard drive long-term preservation, for the information system Tiaoyong;
22. To achieve centralized monitoring system, production data management computer
1) intuitive and friendly interface, easy operation and complete functions. Dynamic images are vivid and full Chinese display, real-time alarm monitoring, security, recognition mechanisms, and data logging capabilities. The quality of the operators has no special requirements, training, simple;
2) the important alarm information and operation parameters on the hard disk recording, data tables, and curves can be called up;
3) production data into the computer hard drive, can be invoked on demand management information system. 6.2 can be automated control system and production management system data sharing management workstation computer based information management system, decision-makers through the management station can monitor their remote access privileges host computer, get on-site production data reporting, equipment management information and production statistics and analysis. 6.3 with fault self-diagnosis function
1. Network fault diagnosis. When the network as a result of disconnection, interference and other transmission problems, the network will automatically detect and alarm;
2. PLC fault diagnosis. PLC scanner and adapter failure, the system will be judged by the communications network failure, and alarm; PLC s I / O module failure, CPU will be through the I / O module detects failures and status bits fault content, the system will issue a warning;
3. Sensor and signal line fault diagnosis. Analog sensor or signal line when the line breaks, PLC, and by measuring the value of judging fault alarm. 6.4 easy maintenance
1. I / O module with removable terminal block, failure, central control room audible alarm can be completed within a few minutes can be replaced;
2. To facilitate system expansion, adding new equipment or on the late works, can easily join the node, and can modify the program through the network line;
3. System with self diagnostic function, failure to timely report the time, location, type of information, moreEasy to maintain. 6.5 Characteristics of Control System The centralized control system has the following characteristics:
1. Use the advanced controller, the system s real-time, high reliability, data processing speed;
2. With fully distributed control, the system has high security. Surface portion of local control fails, the underground part of the operation can achieve centralized control;
3. Communication network speed, distance, high reliability;
4. Intuitive and friendly interface, easy operation and complete functions. Man-machine interface is not only vivid and full Chinese display dynamic images, it also has real-time alarm monitoring, security, recognition mechanisms, and data recording capabilities;
5. To reduce cabling costs, due to the use of remote communication network, so that wiring is more convenient, and greatly reduce the amount of cable;
6. Easy maintenance, low operating costs. Easy system expansion, which can increase the node, and through the network line from Central Control Room modify the program. Controllers and network reliability, maintenance workload is small;
7. Summarize the mineral belt transport system lessons learned, in particular, has taken measures to increase equipment reliability, such as the use of advanced and reliable control and networking products.