Tobacco Leaf Grading Control System Design And System Integration Research

Aiming at the problem of spend amount of human and financial resources, and the classification result was unscientific, subjective and low efficiency because of susceptible to subjective during the process of flue-cured tobacco classification. Our team carried out a research of auto-classification device of flue-cured tobacco. Through develop a set of device that can replace the manual work to achieve the goal of efficiency, classification standard unified and quality improvement. According to the research of characters of flue-cured tobacco, combined with the experience of manual classification in the purchase station, the auto-classification device was divided into four parts, including posture correcting device, smooth device, image capture device and sorting device. In this paper, a research of auto-classification device of flue-cured tobacco was developed, including main contents as follow:(1)Research of technological process and overall electrical control system in the production line. Combining with the experience of manual classification in the purchase station, technological process of tobacco classification was researched. Finally designed the production efficiency of 2.38s/sheet. Basing on the overall mechanical structure design of the auto-device and technological process, three different sets of overall electrical control scheme of the production line was proposed. Through comparison and contrast the advantages and disadvantages of the three kinds of scheme, the first option that used S7-300 as the control core, used a network switch to communicate for DP net and MODBUS net, use MPI for subordinate unit communication was chose as the final electrical control scheme.(2)Design and analysis of hardware system in the control system. Hardware system including the main components of the control system was designed and analysised. Finallydetermined to chose Siemens S7-300 PLC as the control core. The model of motors and other main electrical components including the color mark sensor and network adapter was chose in this paper.(3)Design and analysis of software system in the control system. On the basis of hardware design, the parameters of frequency conversion driving system and servo drive system that needed to be set was analysised. Using the programming software STEP7,configuration design and control programming including the total program and subprograms of the control system was completed.(4)Parameter setting research of the posture correct servo system. Through established the three-ring simulation model for posture correct servo system in SIMULINK. The critical proportional method and the response curve method was used for PI parameters setting of speed ring and P parameter setting. Through contrast and analysis of the simulation results, Different parameters was set for the speed proportional gain, integral time constant parameter and position proportional gain in the servo system, final tuning parameters was kp = 0.3471, ki = 0.4173, kpp = 56.75.(5)Integration research of flue-cured tobacco classification Control System.Communication designed between King View and PLC via serial communication between King View and tobacco grading algorithm VC program; Combining with the control program of auto-classification production line, using Kingview software to design the monitoring interface for convenient man-machine interactive function.