Design Of Control System For High-speed Corrugated Cardboard Bundling Production Line

The post-station bundling methods of corrugated board production enterprises in our country are mainly manual bundling and semi-manual bundling.Workers have strong labor repetitiveness and poor working environment.At present,there is no set of mature strapping equipment that can be docked with the advanced corrugated cardboard production line to complete the mechanized and automated strapping of corrugated cardboard post-station strapping.Therefore,the equipment of a high-speed corrugated cardboard bundling production line can not only fill the vacancy of domestic bundling equipment,but also reduce the production cost of the enterprise,and finally reach the production goal of adding value and improving efficiency of the enterprise.According to the research status of domestic and foreign bundling equipment and the actual needs of domestic corrugated paperboard enterprises,this paper designs a set of corrugated paperboard production line control system with the characteristics of rapid supply,intelligent detection,flexible adjustment and so on.The process flow and overall design of the corrugated cardboard bundling production line were determined,and the structure and working principle of the bundling production line were studied.Complete the hardware framework design and control process design of the control system.It is aimed at the problems of unstable shape and inaccurate positioning of cardboard when fast-feeding on the bundling production line.Based on the theory of frictional kinematics of the contact surface,the kinematics equation of corrugated cardboard stacking is established,and the variation laws of acceleration and cardboard friction coefficient at the start and stop of the production line conveyor belt are solved.When the conveyor belt starts and stops,the maximum acceleration is less than or equal to the product of the minimum static friction coefficient and the acceleration of gravity in the friction pair of the corrugated cardboard stack((6₈?6??2)₈4)9))),it can ensure the stable supply of the corrugated cardboard stack.The surface morphology,corrugation direction and vertical load of the cardboard were extracted.Usingorthogonal xperiments,the coefficient of static friction of corrugatedardboarwas obtained between 0.227-0.647,the coefficient of dynamic friction was 56.3%—79.6%of the coefficient of static friction,and the coefficient of friction of corrugated cardboard influencing factors was analyzed.The results show that under the same conditions,the friction coefficient of the cardboard is the largest when there is no corrugated surface contact;the friction coefficient is the smallest when the double corrugated surface is in contact;The friction coefficient of the two specimens with the flute direction perpendicular to the sliding direction is greater than the friction coefficient of the two specimens with the flute direction parallel to the sliding direction;As the positive pressure increases,the coefficient of friction of the cardboard increases first and then tends to be stable.The relationship between the coefficient of friction of the corrugated cardboard and the positive pressure can be expressed using a cubic linear regression equation.Through the friction experiment of corrugated cardboard with conveyor belt and workbench,it is found that the surface morphology of cardboard has a greater influence on the friction coefficient of cardboard with conveyor belt and workbench.According to the requirements of stable supply of cardboard stacking form,the master-slave control scheme of the motor of the supply unit of the production line was determined.The fuzzy PID of the motor speed and the classic PID control model are established in MATLAB.Through the comparison of the simulation results,it is found that the fuzzy PID control is better than the classic PID control in controlling the motor speed control accuracy and error adjust of the control system,and the production line motor speed adjustment time is reduced 33%.Fuzzy PID control can effectively suppress the oscillation and overshoot generated during the speed adjustment of the conveyor belt,reduce the speed fluctuation of the conveying mechanism of the binding production line,and improve the operation stability of the binding production line.Therefore,this paper chose fuzzy PID control as the adjustment algorithm of the motor speed of the conveyor unit of the binding production line.Aiming at the problem that the front-end production line's raw pipe system is complicated and the back-end bundling production line cannot obtain the specification data of the cardboard to be bundled,a corrugated cardboard specification detection and feeding position detection scheme is designed,so as to realize the supply speed of the bundling production line and the width of the bundling head can be based on the cardboard Specification,type flexible adjustment function.According to the above research content,the optimized design of corrugated cardboard high-speed bundling production line was completed.Combined with the on-site functional testing and performance testing of the bundling production line,the bundling production line achieved the design goals of corrugated cardboard intelligent detection,flexible adjustment,stable supply and automatic bundling.The effect of knotting is better than manual bundling,which reduces the number of corrugated cardboard packaging stations by 70%.The single-station corrugated cardboard bundling speed can reach 10-13 times/min.