Crusher is a mining crushing device used in open-pit mine production to break large pieces of ore into the required size according to production needs. Its importance is self-evident. To improve the operational reliability of the mining crusher, reduce production costs, and improve crushing quality, you can try to introduce PLC automatic control technology to realize the automation of crushing operations through programmed controllers, free up the workforce. At the same time, operation is more precise, avoid human errors, and has significant value. Next, you can follow the editor to look at the PLC technology application path in the mine crusher automatic control system.
Crusher Overview of the Connotation of the PLC System
PLC is a controller that realizes automatic control functions through programming. It includes a central processing module (CPU), input and output and expansion interfaces, power supply, programmer, and memory. It is a commonly used computer control system currently used in industrial automation system. The CPU is the core of the entire system. The program is edited into the CPU through the programmer. At the same time, the output and input devices are connected to the controlled components. When the parameters collected in the front meet the program trigger conditions, the CPU will be programmed according to the preprogrammed parameters. The program is transmitted to the control component through the output device, and corresponding operations are performed according to the program settings.
Crusher Advantages of PLC Automatic Control Technology
- The programming of the PLC system is simple, easy to master, intuitive, and easy to learn. Usually, you can effectively master the programming technology after a few days of training, significantly saving training costs and reducing the difficulty of popularization.
- Although there are many PLC systems on the market, each with its own advantages and disadvantages, their operating principles are the same. At the same time, many PLC systems also have expansion modules that can be flexibly combined.
- The mining area has complex links and harsh natural conditions, and the PLC system in the stone crusher machine is highly adaptable and can effectively adapt to this environment.
Crushers Selection of PLC Models
At present, PLC technology is perfect, and its performance is stable and reliable. However, based on the advantages and disadvantages of different types of PLC systems, after comprehensive analysis, it was decided to use Rockwell’s AB-Logix5000 PLC. This type of PLC system can be modified and programmed online. Problems found during debugging can be modified in time without repeatedly downloading the program. The operation is more straightforward. It also has good scalability and can communicate with other host computers. Based on the above advantages, it was decided to use this PLC system to build automatic control system of the crushing machine.
The PLC system must first compile a program and store it in the CPU. After the program execution conditions are met, the CPU issues opening and closing instructions to the controlled components to achieve automatic control, including pressure, temperature, height, current, etc. This requires setting up sensing devices in each control module, collecting relevant parameters, and passing the parameters to the PLC through the input lines. In the CPU, the operating instructions of the program are transmitted to the crushing components that need to be controlled through the output lines. For example, current and voltage sensors need to be set in the motor control module.
Crusher Application of PLC in Automatic Control System
(1) Crushers PLC-based motor automation control
The crusher indonesia needs to be started and operated with load for a long time, and the coal blocks processed simultaneously are of different shapes and sizes, so the load is volatile. During operation, the motor operation should be automatically controlled to maintain stable operation of the system. Please set up a current collection device in the rock crusher motor system to collect real-time parameters and feed them back to the CPU control center. At the same time, multiple resistors are connected in series in the system. According to the current situation , the resistance path is opened and closed to adjust the current so that the motor always runs in a stable state.
(2) Crushers PLC-based automatic control of lubrication systems
The lubrication system provides lubricating oil, coolant, etc., to the transmission device in the crushing module. The stone crusher’s lubrication system is centralized lubrication. To realize automatic control of the lubrication system, the lubrication and temperature of relevant components can be detected through pressure and temperature sensors, operating conditions, etc., and transmit pertinent data to the CPU module of the PLC to monitor the oil pump cutoff, pressure loss, and overtemperature of the lubrication system.
(3) Crushers PLC-based automatic control of crushing status
In the automated control of this module, the PLC system and the frequency converter device are combined to collect parameters such as the china crusher operating load, roller rotation frequency, operating time, etc. When the preset parameters are reached, the power supply of the feeding device is turned on and off.
(4) Crushers PLC-based alarm automation control
The upper and lower limits of alarm parameters are set for each mining stone machine module, including the control module, lubrication module, crushing status, motor current, etc. If the automatic control system of one of the modules fails and normal functions cannot be achieved, the collected relevant parameters cannot be effectively adjusted. Abnormalities will occur. When the value is higher than the upper limit of the alarm parameter or lower than the lower limit, the PLC will activate the alarm function and stop operation. At the same time, it prompts modules with abnormal parameters to facilitate fault finding and equipment maintenance.
(5) Crusher Safety design of PLC system
PLC systems need to consider safety when designing fully. First, because the PLC system has high real-time requirements during operation, communication can be temporarily interrupted during network communication. Although it can be automatically restored later, during this process, the PLC controller will be in a state of control. In addition, this system is a PLC control system composed of multiple control modules. In this system, if the control commands are only transmitted through the communication network, then when the communication is interrupted, the commands will not arrive in time, affecting the system's timeliness and causing operational safety hazards. Therefore, in addition to the communication network, it is best to form a hardware chain through the I/O points in the system to transmit instructions. In addition, in the “emergency stop” command of the control module and management module, if one of the two modules stops running according to the emergency stop command, but the other module does not stop running in time due to the interruption of the communication network and is still running. The consequences will be seriousness, which is self-evident. Therefore, in the “emergency stop” command of the control module, it is necessary to cut off not only the power of the controlled module but also the management module and programming module at the same time to achieve simultaneous shutdown.
