1 Coal mine ventilation automation system based on TCP/IP protocol
1.1 Working principle
The design of this kind of system takes into account the environmental conditions of the coal mine ventilation system, and adopts three different design methods: hierarchical design, redundant design and distributed design for the harsh environment of the coal mine ventilation system and the specific operating environment, and its hardware equipment. And the overall framework is also intact. The system is combined with communication network technologies such as Ethernet and optical fiber data transmission to ensure system reliability. The software system uses the VC++ configuration language to effectively control the coal mine ventilation system and improve its safety.
1.2 Main functions
(1) Manual operation function, which allows the operator to directly operate the system, and can realize the state of opening, closing, and suspending the fan at any time without starting the substation controller.
(2) Semi-automatic operation function, which mainly realizes the remote control of the status of the main and sub-station by the staff, thereby realizing effective control of the ventilation system.
(3) Automatic control function, this kind of function can greatly save manpower, the system itself will transmit the collected data to the main station according to the state of the operation of the coal mine ventilator, and then control the operation status of each part of the substation to realize the automatic control function. .
(4) “Three remote†function, “three remote†function mainly refers to the collective functions of system remote control, telemetry and remote signaling. Different functions play different roles. The remote control function is mainly responsible for sending control commands, and the system will operate the fan according to the sent control commands. The telemetry function is mainly to detect the coal mine ventilator in the running state, including the voltage, temperature, current and other information data in the operation, and then transmitted to the main station system. The remote signaling function uses remote monitoring to collect the status data of the ventilator by monitoring its operating status and transmitting it to the primary station system.
(5) Data real-time display function, this kind of function is mainly to display the status data of the fan running in real time, which is convenient for detection.
(6) Record the fault function function. If the ventilation system fails, the system will automatically record it. The maintenance personnel can use the function of the system to understand the current state data for better maintenance.
(7) Cross-line alarm function, whether it is a local system or a remote system, once the cross-line range occurs, the system will automatically alarm to improve the staff's failure. Real-time monitoring of fan operating conditions is possible.
(8) Redundancy function, this kind of function is mainly to ensure the normal operation of the machine and maintain normal order in a certain period of time when the fan is faulty.
(9) Expand the function, which can make the system increase the monitoring substation at any time when the ventilation system needs it, and maintain the organic connection with the main station.
1.3 System Implementation
Based on the application of this system, the coal mine ventilation system is mainly composed of the ground centralized control center, the monitoring and information integration substation and the industrial Ethernet ring network. The master station exchanges real-time data with each substation via Ethernet, while the substation of the automation system is responsible for accepting commands issued by the main station for automated operation.
2 coal mine ventilation frequency conversion automation system
2.1 Working principle
The system is realized after the original ventilation equipment is modified. The working principle is that a frequency conversion control cabinet is connected in parallel on the basis of the original control cabinet, and the ventilation machine is controlled by the frequency conversion control cabinet, so that the frequency conversion can be achieved. The control state of the power frequency dual-loop operating system. And the system adopts the operation mode of “one for two†and “one for oneâ€, which can better realize the free conversion between power frequency and frequency conversion. In the coal mine ventilation frequency conversion automation system, two inverters are used, one inverter controls one main station fan, the fan is modified, the control valve inside is removed, and then combined with the controller system programming, so that it can directly Operate and control the coal mine ventilator to achieve the automation effect of ventilation frequency conversion.
2.2 Reform measures for coal mine ventilation variable frequency automation system
First of all, the two systems of DOS centralized control and remote communication are used to control and monitor the interface networking, so that the control function can be easily realized, and the state of the fan operation can be grasped in time.
Secondly, two kinds of operation control modes can be set on the automatic frequency conversion cabinet. One is to manually adjust the air volume control mode, and the other is to automatically adjust the air volume control mode. In the automatic adjustment air volume operation control mode, the frequency of the machine output during operation can also be adjusted to form an automatic closed-loop control of frequency and air volume.
Finally, the coal mine ventilation frequency conversion automation system after the successful transformation also has a multi-directional function. Master the various data information of the fan operation, let the operator have traces, monitor the state of the fan operation in real time, and immediately start the alarm device if there is any problem, to avoid major accidents.
2.3 Frequency conversion automation transformation effect of ventilation system
After the transformation of this kind of system, it can easily realize the automatic conversion of the controller frequency conversion and power frequency, and adopt the three frequency conversion control methods of local, automation and microcomputer to operate the whole system. In the event of a malfunction or a problem, the system automatically switches the controlled fan.
The modified ventilation frequency conversion automation system has higher automation level, saves manpower and material resources, and produces flexible start, which can change the ventilation volume at will, reduce the loss, and greatly improve the operating state of the fan.
3 Conclusion
In summary, automation technology is a major trend of development at present, and is an important measure to ensure the safety of coal mine ventilation. It is of great significance to combine automation technology with coal mine ventilation management. This article mainly describes the application of two major automation technologies, each of which has its own merits and unique features. In order to ensure safer and more efficient operation of the coal mine ventilation system, advanced technology must be introduced to achieve optimal production conditions and improve production efficiency.
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