| Automobile door trim is an important part of the car interior.As the decoration of the car door,the quality of door trim will directly affect the overall decoration effect of the car interior.The traditional door trim production line is a manual production line.The increasing labor costs and many problems in production have greatly limited the development of the enterprise.Therefore,the research of automatic integrated control system of door trim production line will have a significant sense in the future.In this paper,PLC is used as the control core,AGV is used for material transportation,and linear manipulator is used to connect the work stations in the production line to form an automatic production line.The specific research contents and conclusions are as follows:(1)Through the analysis of the process flow and existing problems of the manual production line of automobile door trims,combined with the design principles and technological requirements,an automated production process of automobile door trims is proposed.In the production process,AGV is used to transport materials and the linear manipulator is used to load and unload materials.Then the overall layout design of the automated production line is carried out according to the product principles.According to the control functions and requirements of the production line,a control solution with PLC as the main controller and signal transmission through industrial Ethernet and hard-wired technology is determined.(2)According to the movement requirements of each station and equipment,the relevant mechanical structure design and pneumatic system design are completed.Inventor software is used to complete the three-dimensional modeling of the production line.Visual Components software is used to complete the production line simulation.The simulation results show that the layout of each station and equipment on the production line is reasonable and there is no motion interference problem,which verifies the rationality of the structural design and layout of each station and equipment.(3)According to the safety requirements of AGV production,the transformation of the diaphragm punching workshop is completed,and the AGV material flow process is proposed.After confirming the guidance method,body type,control system,and charging system of AGV,the two-dimensional code-guided backpack-lift AGV is chosen to use.Through the analysis of AGV safety requirements,the obstacle avoidance sensors selection is completed.Then,according to the equipment layout and production process requirements of the workshop,the material flow path design between the diaphragm cutting workshop and the injection molding workshop is completed.Finally,combined with the actual production needs of the enterprise,the required number of AGV is determined.(4)According to the control system I/O signal points,S7-1200 is selected as the main controller.Then,according to the power requirements of each station of the production line,the main circuit incoming power is designed to provide 220V AC voltage.The control circuit is powered by the PLC power supply module and the switching power supply to provide 24V DC voltage.The system software is divided into several subprograms such as automatic program,manual program,and alarm program,etc.The system software is written in ladder language and the manipulator control program is written with the programming software of the teach pendant.WinCC software is used to complete the man-machine interface design.(5)In order to modify the unreasonable part of the program,PLC SIM software is used to simulate and debug the PLC program.Then,the on-site debugging is carried out to test the production capacity of the production line.The results show that the designed system can complete the production requirements of the enterprise safely and steadily. |
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