Introduction
Belt conveyor is the main transportation equipment in automatic mining, which can realize large-scale and fast transportation of coal. In the design process of belt conveyor, its operation power is large and has a certain design margin to meet the working conditions of full load and overload. When the coal load is small, due to the high-speed operation of the conveyor belt, it tend to cause energy consumption and waste, which is not conducive to the energy conservation, emission reduction and cost control of the coal mine. While the coal mine is moving towards automatic mining, it should also develop back to the direction of intelligence. In view of the energy consumption of belt conveyor, intelligent control mode is adopted to intelligently adjust the speed according to the coal loading, so as to realize the energy-saving control of belt conveyor, reduce the waste of energy source, reduce the wear of belt conveyor and improve the intelligent level of coal mining.
1. Design of fuzzy controller for intelligent energy consumption of belt conveyor
Fuzzy control is an important method to control complex nonlinear system such as belt conveyor. For the controlled object, the fuzzy variable is described in the form of language. It does not need accurate mathematical model, and fuzzy control method can be used to describe the relationship between variables of the belt conveyor. The fuzzy controller has better adaptability, robustness and fault tolerance for belt conveyor.
During the operation of the belt conveyor, when the coal load is different, the speed of the belt conveyor can be changed to realize energy-saving operation, and the running speed can be adjusted by adjusting the frequency of the motor, so as to realize the energy consumption control of the belt conveyor. In the process of operation, the speed is adjusted according to the coal load, when the coal load is Q. , the speed of the belt conveyor for V, and speed through the speed sensor acquisition, fuzzy controller is used to analyse the data collected by signal processing, get the velocity deviation e, its input into the fuzzy controller, through the PLC control the value of the frequency converter to change the work frequency of the motor, so as to realize the intelligent control of the speed.
2. Design of intelligent energy consumption control system for belt conveyor
2.1 Overall design of intelligent energy consumption control system of belt conveyor
Based on fuzzy control of belt conveyor, the whole intelligent energy consumption control system is designed. Taking PLC as the control core of hardware system, the energy consumption optimization model of fuzzy control is established. According to the optimal matching relation between coal load and running speed, the frequency conversion adjustment of belt conveyor is realized to realize energy saving and consumption reduction.
The intelligent energy consumption control system of belt conveyor sends out control instructions through the upper computer, and PLC controls the frequency converter to adjust the motor, so as to adjust the running speed. At the same time, the speed of the sensor is collected and fed back to PLC, and transmitted to the upper computer to realize the monitoring of the running speed. The overall structure of the control system is powered by the power distribution cabinet. PLC is connected with the host computer through Ethernet, and the PROFIBUS communication protocol is used to connect with the frequency converter to realize the real-time communication of frequency regulation.
The function of intelligent energy consumption control system of belt conveyor mainly includes energy-saving operation, realizing self-regulation according to different coal load; Capable of intelligent control, automatic adjustment of running speed based on PLC fuzzy control; With the belt conveyor self-protection function, when there is a failure or conveyor belt deviation, temperature is too high, can be emergency braking, parking and alarm processing; It has the function of real-time monitoring. According to the data and section of the upper computer, it can monitor the running state of the belt conveyor in real time, and store and query the running data, which is convenient to realize the intelligent management of the belt conveyor.
2.2 Hardware connection design of intelligent energy consumption control system of belt conveyor
PLC as the main controller, its work reliability for the stable operation of the system has an important impact. The hardware part of the control system mainly includes PLC controller, frequency converter and motor, upper computer and various sensors.
2.3 Design of key functions of intelligent energy consumption control system of belt conveyor
In the intelligent energy consumption control system of belt conveyor, the speed adjustment is mainly based on the size of coal load, which is particularly critical for the accuracy of monitoring data of coal load. In the process of operation, the electronic belt scale is used to monitor the coal load, and the accuracy of the electronic belt scale is high to ensure the accuracy of data.
Electronic belt scale measurement system, the conveying belt conveyor in the process of coal, coal weight function on the sensor response data signals, the transmission to the industrial PC for data analysis, and then to transmit a signal to the intelligent control system, the energy consumption on the basis of coal load of the collected by data processing, and adjust the speed of response.
3. Conclusion
Belt conveyor as the main equipment of coal transport, due to the different working conditions of underground coal mining, different coal transport in different periods of time, shearer to maintain constant speed operation caused a certain amount of energy consumption waste, is not conducive to the mine energy conservation and emission reduction and cost control. In order to solve this problem, design the fuzzy controller, PLC control and intelligent control system of energy consumption on the basis of the study design, so as to realize the coal load according to the different, conveyor belt running speed of real-time adjustment, improve the automation level of the belt conveyor running, and reduce the energy consumption and is beneficial to the long-term use of belt conveyor, reduce the cost of coal mine, The comprehensive benefit of coal mine has been improved.
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