Application And Development Of Multi Axis Rotary Screen Printing Machine Control System

With economic and efficient technical features, rotary screen printing machine has been widely appreciated by more and more printing enterprises, its features of continuous work, high-speed production, high printing precision and good stability make rotary screen printing technology in the field of screen printing champion. Although textile dyeing has greatly improved its technology in all aspects in recent years, it still faces a variety of difficulties and challenges for its stability of equipment, production efficiency and quality need to be further enhanced. Against this background, the subject cooperated with Delta Greentech(China) Co.,Ltd., jointly offered design of rotary screen printing machine based on DMCNET bus control.In the first part, this thesis will make a simple analysis of the mechanical composition and control system of rotary screen printing machine. Demand analyses of the rotary screen printing machine control system were processed firstly from the following aspects of printer control system composition, function and printing machine precision. Focusing on the motor speed, this paper analyzes the causes of printing errors in order to put forward solutions.In the second part, there is a concentration on the design of multi axis synchronous control subsystem. It is the most central part of the entire rotary screen printing machine control system that consists of both the inverter and servo system. This thesis makes an introduction on ways of synchronization control and principle of frequency converter control, which serves as a basis to design two transmission modes of inverter and servo control scheme and finally contribute to complete specific control design according to characteristics of the printing press.In the third part, analysis and design of the printer communication subsystem and human-computer interface will be carried out. Reliable communication is the basis for coordinating the work of various parts of the control system and also the assurance for high-speed and stable operation of the whole system. Date exchange of each part of the system needs to be carried on demand analysis first and then two bus control codes of MODBUS and DMCNET should be adopted respectively, depending on the frequency converter system and servo system control precision to meet the requirements of communication subsystem. Basing on the demand analysis of man-machine interface, design of man-machine interface screen control can be realized including functions as data monitoring, input and output, alarm display.etc.In the final part, this thesis is going to interpret the debugging in rotary screen printing machine control system from aspects of both the machine function debugging and printing precision debugging. It is available to make the printing machine run normally by manipulating the touch screen and to realize the separate and synchronous control of rotary screen printing. Besides, the printing precision of rotary screen printing machine can be calculated by measuring the relationship between the speed of servo and pulse position error.The locale testing result shows that each printing machine motor of the system can operate stably with 12 axis rotary screen at the same time with a printing precision of 0.01 mm. The maximum operating speed can be up to 100m/min and all the indexes have met the predetermined requirements.