Energy is the cornerstone of social development. With the exhaustion of non-renewable energy sources, energy conservation and consumption reduction has become the most important task for enterprises. The current frequency conversion speed regulation technology can play an energy-saving operation in industrial production and reduce the production cost of enterprises, and has been widely used in various professional fields. In the transportation system of mining enterprises, frequency conversion speed regulation technology has played a key role. The thesis elaborates the advantages of frequency conversion speed regulation technology in detail, and makes a detailed study on the application of frequency conversion speed regulation technology in mine transport hoist system.
1. Analysis of the advantages of frequency conversion speed regulation technology in transport hoists
Frequency conversion speed control equipment is widely used at present, mainly because there are many advantages in its use. Specifically in the following points:
(1) Frequency conversion speed regulation technology can adjust the acceleration and deceleration time of the motor, optimize the start and stop of the system, ensure the stability of speed change and operation, and improve the operating efficiency of the hoist system as a whole
(2) The frequency conversion speed regulation technology is easy to debug during the equipment process, and the later maintenance process is also very simple. In mine transportation, the working status of the hoist is different at different stages and locations. When installing the frequency conversion speed control device, we only need to wire according to the on-site working conditions, and then set the relevant parameters.
(3) The frequency conversion speed regulation technology implements the closed-loop method of vector control, and outputs the operation of the hoist with the rated torque to realize zero-speed brake operation. Full-speed control can be easily achieved, avoiding the adverse effects of sniffing and closing, thereby affecting the use of the device.
2. Application of frequency conversion speed regulation technology in mine hoist
The transportation system of mine hoist includes four parts: transmission system, auxiliary system, braking system and control system. The details are as follows.
(1) PLC system. The hoist system is different from other systems. Currently, it adopts dual PLC working mode, one master machine is used for normal work, and the auxiliary machine is used for backup. Assuming that the working PLC system fails and cannot work normally, the system will automatically switch to the standby PLC to ensure the normal operation of the entire system. Applying the high integration of the PLC system itself, it is possible to integrate parameters such as the main drum shaft, motor shaft, shaft encoder, and sky wheel, and at the same time monitor the operating speed and operating position of the hoist to ensure operation.
(2) Signal control. At the mine transportation site, the state operation parameters, fault protection signals, and instruction operation signals in the hoisting system can be introduced into the main control unit, and the data parameters, signals, etc. can be blocked or logically operated with the operating system content, and finally output the corresponding Control instruction. When the system has an abnormal signal, it will analyze it according to the corresponding logical operation to see if there is a fault, and the corresponding signal that the system can receive will get the corresponding conclusion, and then it will carry out corresponding measures according to the degree, and if a fault occurs Different fault types will be displayed in the machine position, and corresponding voice-activated alarms can also occur. In addition, the monitoring and monitoring system can check the corresponding signals. The corresponding signals can be seen during normal operation, and various parameters of the operation can also be displayed when a fault occurs. This greatly facilitates the relevant maintenance technicians to judge the fault according to the data, and can perform maintenance in time to ensure the operation of the system.
2.2 The specific scheme of frequency conversion speed regulation technology for hoists in the transportation system
(1) Rotor circuit speed control system. During the acceleration process of the system, each AC contactor realizes the attraction effect, and the network resistance of the rotor is reduced, so as to maintain the stability of the average value of the acceleration force. To realize the low-speed operation of the hoist, a corresponding large resistance needs to be connected in series in the rotor. Generally, low-frequency power can be applied to the stator winding to improve the negative force condition in the deceleration section. This method is called dynamic braking.
When the motor of the hoist is in working hours, the scheme will have the following problems:
1. Contact control problem. The application of large-capacity switches increases the difficulty of system maintenance and reduces the reliability of operation;
2. The switch has a step-by-step speed regulation problem, and the acceleration of the system cannot be accurately controlled, so it will lead to inaccurate speed regulation;
3. The working efficiency of the operation is low, and the low-speed operation will cause the resistance consumption to be too high, which is not conducive to the efficiency of energy utilization;
4. The power consumption is 1/3 of the output power, and the characteristics of the machine city are soft. This speed control scheme has the advantages of less investment, relatively simple operation, easy to use, etc., and is widely used in small mine transportation systems.
(2) Fuzzy control system. In the process of controlling the speed of the hoist, two-dimensional input variables can be adopted. Through the sampling function of the PLC system, the precise controlled quantity can be obtained, and the corresponding program can be customized and compared with it to obtain parameters such as error signal and error change rate. The error signal and the precise quantity of the error change rate are converted into fuzzy quantities, and then the fuzzy control quantity is obtained through the fuzzy reasoning theory, and the defuzzification process is carried out, and finally the control signal is obtained to control the object through signal transmission. The fuzzy control system belongs to nonlinear control, and its working range and application range are very large, and its application is very wide. The disadvantage is that the processing information of the application is simple and the precision is relatively small.
Energy is the cornerstone of social development. With the exhaustion of non-renewable energy sources, energy conservation and consumption reduction has become the most important task for enterprises. The current frequency conversion speed regulation technology can play an energy-saving operation in industrial production and reduce the production cost of enterprises, and has been widely used in various professional fields. In the transportation system of mining enterprises, frequency conversion speed regulation technology has played a key role. The thesis elaborates the advantages of frequency conversion speed regulation technology in detail, and makes a detailed study on the application of frequency conversion speed regulation technology in mine transport hoist system.
1. Analysis of the advantages of frequency conversion speed regulation technology in transport hoists
Frequency conversion speed control equipment is widely used at present, mainly because there are many advantages in its use. Specifically in the following points:
(1) Frequency conversion speed regulation technology can adjust the acceleration and deceleration time of the motor, optimize the start and stop of the system, ensure the stability of speed change and operation, and improve the operating efficiency of the hoist system as a whole
(2) The frequency conversion speed regulation technology is easy to debug during the equipment process, and the later maintenance process is also very simple. In mine transportation, the working status of the hoist is different at different stages and locations. When installing the frequency conversion speed control device, we only need to wire according to the on-site working conditions, and then set the relevant parameters.
(3) The frequency conversion speed regulation technology implements the closed-loop method of vector control, and outputs the operation of the hoist with the rated torque to realize zero-speed brake operation. Full-speed control can be easily achieved, avoiding the adverse effects of sniffing and closing, thereby affecting the use of the device.
2. Application of frequency conversion speed regulation technology in mine hoist
The transportation system of mine hoist includes four parts: transmission system, auxiliary system, braking system and control system. The details are as follows.
(1) PLC system. The hoist system is different from other systems. Currently, it adopts dual PLC working mode, one master machine is used for normal work, and the auxiliary machine is used for backup. Assuming that the working PLC system fails and cannot work normally, the system will automatically switch to the standby PLC to ensure the normal operation of the entire system. Applying the high integration of the PLC system itself, it is possible to integrate parameters such as the main drum shaft, motor shaft, shaft encoder, and sky wheel, and at the same time monitor the operating speed and operating position of the hoist to ensure operation.
(2) Signal control. At the mine transportation site, the state operation parameters, fault protection signals, and instruction operation signals in the hoisting system can be introduced into the main control unit, and the data parameters, signals, etc. can be blocked or logically operated with the operating system content, and finally output the corresponding Control instruction. When the system has an abnormal signal, it will analyze it according to the corresponding logical operation to see if there is a fault, and the corresponding signal that the system can receive will get the corresponding conclusion, and then it will carry out corresponding measures according to the degree, and if a fault occurs Different fault types will be displayed in the machine position, and corresponding voice-activated alarms can also occur. In addition, the monitoring and monitoring system can check the corresponding signals. The corresponding signals can be seen during normal operation, and various parameters of the operation can also be displayed when a fault occurs. This greatly facilitates the relevant maintenance technicians to judge the fault according to the data, and can perform maintenance in time to ensure the operation of the system.
2.2 The specific scheme of frequency conversion speed regulation technology for hoists in the transportation system
(1) Rotor circuit speed control system. During the acceleration process of the system, each AC contactor realizes the attraction effect, and the network resistance of the rotor is reduced, so as to maintain the stability of the average value of the acceleration force. To realize the low-speed operation of the hoist, a corresponding large resistance needs to be connected in series in the rotor. Generally, low-frequency power can be applied to the stator winding to improve the negative force condition in the deceleration section. This method is called dynamic braking.
When the motor of the hoist is in working hours, the scheme will have the following problems:
1. Contact control problem. The application of large-capacity switches increases the difficulty of system maintenance and reduces the reliability of operation;
2. The switch has a step-by-step speed regulation problem, and the acceleration of the system cannot be accurately controlled, so it will lead to inaccurate speed regulation;
3. The working efficiency of the operation is low, and the low-speed operation will cause the resistance consumption to be too high, which is not conducive to the efficiency of energy utilization;
4. The power consumption is 1/3 of the output power, and the characteristics of the machine city are soft. This speed control scheme has the advantages of less investment, relatively simple operation, easy to use, etc., and is widely used in small mine transportation systems.
(2) Fuzzy control system. In the process of controlling the speed of the hoist, two-dimensional input variables can be adopted. Through the sampling function of the PLC system, the precise controlled quantity can be obtained, and the corresponding program can be customized and compared with it to obtain parameters such as error signal and error change rate. The error signal and the precise quantity of the error change rate are converted into fuzzy quantities, and then the fuzzy control quantity is obtained through the fuzzy reasoning theory, and the defuzzification process is carried out, and finally the control signal is obtained to control the object through signal transmission. The fuzzy control system belongs to nonlinear control, and its working range and application range are very large, and its application is very wide. The disadvantage is that the processing information of the application is simple and the precision is relatively small.
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