Study On The Control System For Molding Equipment Of Fruit Cultivation Bag

Bagging technology is being widely spread in apple production. Bagging could create a suitablemicro-environment for the fruit growth, improve color of apple fruits and its peel smoothness, decreasepeel pesticide residues and isolate pests. A higher requirement was put forward to the fruit bags produceequipment to meat the need of the fruit bag production as the type and the shape of the bag affected thequality of the apple fruit Improving fruit bag machine has important significance to the increase thequality of the paper bags production.Production process of double-paper bag producing, the role of each module in fruit bag machineand the main factors to affect the paper bag quality were analyzed. Function of shaping device wasimproved. The integral semicircle-and-straight-combined-knife was used to cut the paper materiel.Pneumatic method was considered to break and clear up the waste edges which had not cut down yet.Pneumatic assistant device was utilized to accomplish the folding process of paper bags and imitationartificial folding device was used to prevent the uneven folded edge of the paper bag while the machinerun in high-speed. Closed gluing device was used in bonding both edge of outer layer of the paper bagin order to prevent the adhesion of the paper with the bag-make-roller by the glue.The tension fluctuation and the transmission deviation of the paper tape in the high speedmovement were analyzed and the regulation device was developed. Then, real-time surveillance andadjustment of paper bag shape were realized.The fruit bag machine tension system is a strong coupling, multi-interfering, nonlinear andcomplex uncertainties. Based on the analysis of the main points affecting tension according to thetension principle, fuzzy adaptive PID intelligent control algorithm is put forward and the automaticadjustment of the controller parameters was achieved to meet the adaptation to the requirements of thenonlinear and time-varying tension control in fruit bag machine. The algorithm was simulazed by usingthe software MATLAB. It was showed that the fuzzy adaptive PID intelligent control algorithm coulddecrease the overshoot, shorten the adjusting time and increase the anti-jamming performance of thesystem.Correcting detection device had been designed based on the analysis of deviation causes of thepaper tape marching direction in the system operation process. CCD sensor was selected as the positiondetection sensor and the CCD drive circuit was designed based on the CPLD. Stepping motor wasselected as the actuator of the rectifying system and the humanoid corrective intelligent controlalgorithm was proposed for adaptation to the requirements of the high-speed dynamic response andaccurate location while actual mathematic model was difficult to established in the corrective system.The algorithm was the control mode combining multi-PID and the transfer control model based on the actual real-time state measurement. The simulation results indicated that the algorithm was closer to theartificial control with high-speed response, accurate location and rear overshooting.The tension and rectification control system with STM32F103VCT6microprocessor as its corehardware was designed considered the processing commands. The system was include CCD photocollection, A/D transfer, FIFO interface and drive circuit of stepping motor, the drive of tension detectorand magnetic powder brake, indicator, touch screen, alarm circuit and etc. The system software wasbased on C language and real-time operating system RTX provided by ARM company. The real-timeRTX system could execute multi-task concurrent to make programming and testing easier. The hostcomputer use touch screen to complete parameter settings, status monitoring and historical data viewing.The system achieved isolation in the signal input and output links, and had a good anti-interferenceperformance with friendly interface, easy to operate and meet the requirements of different coil control.The paper bag was minor error after the mechanical device and each functional module were tested. Thedesigned on-line monitoring system of the fruit bag machine was stable tension control, fast suitablecorrection, high precision and strong adaptability as well as could provid theoretical basis and designingreferences for high-speed operation of roils in similar condition.