Research On Automatic Loading Control System Based On PLC

The large-scale open-pit mining machinery front shovel excavator is the core equipment of open-pit mining,and its comprehensive performance directly determines the production efficiency of the entire mine.The research content of this paper is the automatic loading part of the intelligent unmanned electric shovel project.The experimental verification platform is built,the software scheme of the automatic loading system is designed,and the controller part of the automatic loading system is designed and implemented.Carried out system integration and real machine test.First,the control object of the electric shovel slewing platform was analyzed and modeled,the control model of the experimental platform was identified,and the discrete linear auto disturbance rejection controller was designed according to the characteristics of the slewing system.The simulation analysis was carried out and the PSO algorithm was adopted to control the auto-reaction.The control parameters of the disturbance controller are optimized.Completed the design and debugging of the experimental platform.With Siemens S7-1200 PLC as the controller and G120 frequency converter as the drive system,a set of experimental platform that simulates a real electric shovel is formed.The communication between the PLC and the touch screen was tested,the inverter was configured with parameters,an encoder was installed to form a closed-loop control system,and the electrical connection was completed,providing an experimental platform for completing the design of the electric shovel automatic loading control system.Designed and completed the software design scheme of the electric shovel automatic loading control system.The communication scheme is designed and realized,the automatic loading rotary part is programmed,and the remaining required modules of the system are introduced.The communication scheme part introduced and realized the cyclic communication scheme design,OPC UA communication scheme design,and S7 communication scheme design.The automatic loading rotary part designed and realized the modules of data receiving,rotary control,bucket opening control,etc.,and programmed the discrete linear auto disturbance rejection controller.In addition,in order to facilitate the control and monitoring of the operating status of the system,a commonly used HMI human-computer interaction page is designed and implemented.The experiment platform test and prototype test were carried out.First,the shaft technology object that comes with the PLC is used for experimental testing,and then the auto-disturbance rejection controller is used for the experimental platform verification.After verification on the experimental platform,the operation test was carried out on the prototype platform and compared with the PID control,which verified the control effect of the active disturbance rejection control.This paper studies and realizes the automatic loading control system part of the intelligent electric shovel design.The system can automatically complete the rotary unloading task,the control process is fast and stable,which meets the control requirements of the rotary task,and lays the foundation for the unmanned design of the electric shovel.