The Design Of Mechanical Device And Tension Control System For Suspension Packing

The packaging industry is an important part of the national economy,and it is also one of the important marking industries of the level of commodity economy development.The traditional packaging is difficult to adapt to the industrial trend for the rapid development of the logistics industry and increasing improvement of the environmental protection regulations.Therefore,the suspension packaging,with the excellent cushioning performance and recyclable characteristics,has become a hot research topic in the packaging industry.In this thesis,a new type of suspension packaging on the basis of the improvement of Korrvu suspension packaging technology was proposed.However,up to now,the suspension packing method is only in the exploration stage,and it is still the manual way to cover the film.So,it is urgent to design a set of automatic film covering mechanical device to improve the production efficiency and to lay the foundation for the popularization of this packaging method.In this thesis,a set of mechanical device for producing suspension packaging was designed.In addition,the power system,rotating expansion mechanism,and film feeding mechanism were studied based on the detailed analysis of suspension packaging technology.The film tension system based on virtual instrument was designed to solve the problem that the film tension was difficult to control.The specific research contents were as follows.(1)The overall design of automatic film laminating machine was studied.The working principle of the automatic film laminating machine was expounded,and the basic structure and key parts of the whole mechanical device were determined.The relevant components of the power system were selected according to the specific requirements of the process.The rotating expansion bracket and rotary expansion box were designed in the rotary expansion mechanism.The model of a pair of gears in the rotary expansion box was established.The model was input into ADAMS to add constraints,loads and drives to verify the rationality of gear design by simulation analysis.The basic structure of the film feeding system was determined,and the film,tension sensor,magnetic particle brake and data acquisition card were selected,which laid the foundation for the realization of the film tension control system.(2)The fuzzy adaptive PID(Proportion Integration Differentiation)control of film tension was studied.Firstly,the mathematical model of film tension in discontinuous laminating process was established to study the influence of coil diameter,acceleration and speed on tension fluctuation.And simulation research was carried out by MATLAB.Secondly,the sine and trapezoid of velocity generating function simulated the laminating operation under different speeds,accelerations,acceleration and deceleration modes,which compared the control effects between PID and fuzzy adaptive PID.(3)The film tension control simulation system based on the virtual instrument was designed.The basic framework of the tension simulation system based on virtual instrument was determined.The Lab VIEW program was written,which was divided into three parts: the permission design program,the tension acquisition program and the tension control program.The graphical programming language designed the simulation program of the film tension control system and the human-computer interface.The mathematical analysis and data processing ability simulated the change of film tension under different working conditions and controlled performance of the whole control system to form a complete virtual tension simulation system.In this thesis,the automatic mechanical device used in suspension packaging has a wide application prospect in the packaging and transportation industry.The film laminating process of the suspension packing cushion has the characteristics of discontinuous operation and frequent acceleration and deceleration,which leads to the uncontrollable film tension.In view of these problems,the mathematical model of film tension in discontinuous laminating process and the fuzzy PID control of film tension were mainly studied,and the film tension simulation platform was designed based on virtual instrument.The simulation results showed that the fuzzy adaptive PID,with the better adaptability and the simpleness of its parameters adjustment,can meet the stability requirement of the film tension control in the process of discontinuous laminating.The simulation platform can intuitively demonstrate the whole film tension control process,which lay a foundation for the practical application of the whole device.