Design Of Pressure Regulating System For Flexographic Printing Machine Based On FPGA

With the continuous improvement of our country's economic strength,the manufacturing of green intelligent equipment has become the inevitable trend of development.In the field of printing,flexographic printing machine,as the only non polluting printing equipment,has been fully developed and widely used in foreign countries.Due to the late start of this field in our country,a large number of foreign products are still used in the medium and high level flexographic printing equipment.Mastering the key technology in the field of printing plays an important role in the development of our country's printing industry.Pressure adjustment of flexographic press is one of the keys for flexographic printing machine to achieve high quality products.In this paper,we will further research and design the pressure regulating system of flexographic printing machine.The pressure adjustment system of flexographic press is a typical application of motion control technology in printing industry.According to the functional requirements of flexographic press pressure regulation and the related contents of motion control technology,we design a pressure regulate system consisting of man-machine interface,controller based on FPGA,stepper motor driver,stepper motor and grating ruler.On the level of motion control algorithm,this paper studies the problem of the step loss or excess of stepping motor as an executive unit,and the feedback lag in the system when grating ruler as a feedback unit.A reference pulse interpolation algorithm is applied to plan the speed of stepping motor,and a closed loop control algorithm without overshoot is designed based on this.Through the analysis and improvement of the deviation coupling control strategy,the design of synchronization control algorithm is completed.Then,combined with the mathematical analysis of stepper motor,we use Matlab and Simulink tools to simulate the motion control algorithm,so as to verify the feasibility of the algorithm.According to the design principle of hardware circuit,we divide the hardware module of the controller.By analyzing the specific application of each module in the actual industrial field,the design of the hardware circuit and the selection of the chip are carried out.In the process of FPGA programming,according to the characteristics of the hardware description language,we reasonably use the internal resources of FPGA to design the motion control algorithm and the related functions in the process of pressure regulation,such as communication and storage.After that,we use Quartus II and Model Sim software to simulate the system program.And a system experimental platform is set up on the flexographic printing machine.Combined with the human-machine interface,micrometer,logic analyzer,we complete the system tuning and get the experimental results,and then verify the smooth operation of the system.The results of the system simulation and the actual test show that the system designed in this paper can realize the multi axis cooperative motion control in the Flexography machine,and it has been successfully applied to the actual industrial control.