Design of control system for automatic placing machine based on PLC
DOU Meng, WAN Yi, WANG Cong hong, REN Bing
(School of Mechanical Engineering, Shandong University, Jinan 250061, China)

Abstract: Aiming at reducing the labor intensity and improving the production efficiency in food industries, the automatic placing machine based on PLC was designed. The pneumatic actuators were driven by compressed air, which had no pollution to the environment. According to the weight and the shape of the objects, the pressure of the system and the sizes of pneumatic actuators were determined. The solidworks was used to establish 3D model of mechanical structure, which included material conveyor belt, tray conveyor belt, slideway and support structure. According to the action of the automatic placing machine, the PLC modules were selected. Then the hardware wiring project and ladder diagram of PLC were established. The pneumatic actuators were controlled by the program, which could realize the action of moving, scaling and rotating. Then the automatic placing machine could grab and place automatically. The results indicate that the automatic placing machine can grab 100 120 materials per minute. This automatic placing machine can improve the automation level of the food industry, which has the advantages of simple structure, strong adaptability and so on.

Key words: automatic placing; PLC control; pneumatic control