Application example of constant power control system for PYD-2200 cone crusher

In recent years, with the rapid development of computer technology to computer-based distributed Control System has been widely used in chemical, power plants, non-ferrous metals industry, at present, Sizhou dressing plant to improve the efficiency of cone crusher for the purpose of industrial use The machine and Siemens PLC modified the PYD-2200 cone crusher feeding system. Since the system was put into use, the operation was stable and the performance was good, which met the technical transformation requirements.

First, the production process

In the crushing operation, the change in the amount of ore, the hardness of the ore and the size of the ore is the main cause of the cone crusher being stuck. The change of ore content, ore hardness and ore particle size can be reflected by the real-time power of the crushed surface. We can automatically adjust the ore supply to the mine according to the ore size and ore hardness, so that the crusher can be safe and efficient in the constant power range. Running.

In this system, the frequency converter is used to control the feeding motor, which replaces the original electromagnetic speed regulating device. The peripheral instruments mostly use the selected digital display instruments to make the collected data more accurate, so as to improve the stability and reliability of the system.

Second, the system principle and composition

(1) System principle

The system is designed as a fixed value control system, and the constant power is given to the power of the crusher. Because the load of the control object does not change much, the hysteresis is small, no error is allowed, and the proportional integral control law is used to adjust the ore amount. The system block diagram is shown in Figure 1:

(two) system composition

The system consists of a display operator station and a process control station

The display station is composed of Advantech IPC and display hardware platform, and uses KZNGVIEW industrial control software to complete various display operation screens, thereby realizing the monitoring and operation of the production process:

The process control station selects SIMATICS7-200PLC as the main controller. Its main configuration basic unit includes CPR216.24V power supply, I/O port and RS-485 communication port: mine exhibition module EM235. Direct control and data acquisition of the production process by programming the PLC process control software: the display operator station and the process control station provide PC/PPI cable via Siemens (with RS-232/RS-485 level shifter on the cable) Realizing data communication, on the one hand, transmitting the parameters in the process control station to the display operation station display; on the other hand, transmitting the control parameters set by the operator at the display operation station to the process control station, and the process control station realizes according to the operator's requirements Direct control of the production process.

Third, the system software

The operation of the whole system is supported by software, and the system software is divided into interface software of the control software.

(1) Control software

According to the process requirements, the application program is programmed in the ladder diagram of the PLC of the host computer. After compiling, the program is loaded into the PLC. The program flow is shown in Figure 2. The main work is as follows:
1. Communicate with the display operator station

2. Sampling the analog input and performing engineering quantity conversion;

3. Perform PID control loop calculation and send the analog output module.

(two) interface software

The KVNGVIEW engineering software of Beijing Asia Control Company was used to complete various display operation screens. The whole interface software was divided into two parts: system configuration and operation monitoring.

System configuration According to the needs of process control, the input data generates data files for system monitoring and use, including system composition definition, basic database definition, process flow definition, timing trend definition, and historical trend definition.

The system operation monitoring part mainly includes process flow chart, parameter setting, real-time trend curve and historical trend curve. Historical data automatically saves, reproduces, and sets password assignment operation permissions and other functions to meet different levels of user requirements. The whole system software runs under the Windows95 environment, has a good user interface, enters into the dialogue mode, the operation is simple and easy to remember, the system structure is clear, and the function is complete.

Fourth, the conclusion

The system not only utilizes the advantages of flexible PLC structure and strong anti-interference ability, but also utilizes the advantages of good PC interface, rich hardware and software resources. Since the system was put into operation in November 1998, it has been operating continuously for more than half a year. Due to the realization of constant power control, the operating current of the cone crusher is increased from the original 28A to 33A, which greatly improves the operating efficiency of the cone crusher.

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