Electronic shaft drive printing machine has many advantages such as high speed, high precision, simple structure, good flexibility, low energy consumption and strong anti-interference ability. Each color on the print is controlled by an electronic axis, and the colors are "mixed and matched" in different proportions to form a colorful packaged print.
"Printing on digital color image color depth requirements are 8 bits, that is to say, high-end packaging printing equipment generally has at least 8 axes, the richer the color, the more electronic axes need to be used. How to make each electronic shaft can not only complete its own 'prescribed action', but also achieve 'seamless connection' with other electronic shafts to achieve synchronous cooperation of multiple electronic shafts is a problem that high-end packaging and printing equipment must solve."
Mei Xuesong introduced that in order to make the equipment print a beautiful pattern, it is necessary to make the electronic axis in the online speed of more than 350 meters per minute, in the case of more than 100 meters of plastic film will control the error within 0.1 mm, otherwise there will be printing pattern deviation, resulting in "big face", even fuzzy and other problems.
In order to solve the problem of printing precision, the team, from the perspective of "measuring + feedback" to different electronic shaft marking printing design, by measuring the software to find great set of tags that adopt the method of distributed control, the communication of each electronic shafts for gigabit network architecture, real-time reaches 1 millisecond, guarantees that every response speed of the shaft At the same time, the control algorithm can be used to monitor the tension change of the film in real time. No matter how many electronic axes are superimposed, the accuracy error of the printing position is less than 0.1 mm.
Ink drying is also the key to ensure a clear print pattern. At high speed, ink drying must be done in a very short time through the color set to ensure that each color "in place". Xue-song mei, energy-saving ink drying system of hot wind energy recycling, not only can be in 0.3 milliseconds drying inks, can also on the printing ink after heated waste heat, peculiar smell, organic gases to timely recovery, the printing and packaging industry in our country as a whole to reduce carbon emissions, realize the goal of "double carbon" in our country and the safety of the food and drug packaging has very positive meaning.
Blending ink is an important work in color printing process, which is directly related to the printing quality of products. Bright color, good brightness and accurate hue are the basic requirements of color printing products. To achieve this requirement, it is necessary to accurately mix the printing ink of each color group. In the past, the deployment of ink this work needs to be completed by experienced technicians, and the difficulty is higher, debugging time is long, and waste a lot of printing material. With the cloud platform, the deployment of ink and equipment and other professional knowledge can be stored in the cloud platform for packaging and printing machinery users to inquire and use. Moreover, each machine can realize networking work, and the operation and maintenance work is completed by the cloud platform.
Power equipment localization, the cost of import only 20%
Before 2007, China's high-end packaging and printing equipment mainly relied on imports from Germany, Switzerland, Japan and other countries. The price of an imported high-end packaging and printing equipment is about 50 million yuan, leading to low-end equipment flooding the market, poor printing quality, high energy consumption and high pollution.
With economic development and social progress, China's demand for high-end packaging and printing equipment is increasing. "The cost of buying a printing press for the price of half an airplane is too high, and we want to bring it down," Mr. Mei said.
Since 1993, Professor Mei xuesong's team has been committed to the research and development of motion control technology for CNC equipment, cooperating with relevant industry leaders, and starting the development process of localization of high-end packaging and printing equipment.
"We mainly adjusted the hardware architecture of the equipment. In the past, for example, a 'brain' had to control eight electrical axes, and signals could be delayed, and one of the electrical axes would respond 'half a beat late'. Now, each axis is controlled by its own 'brain', which is connected by high-speed signals to ensure that they both work in sync and adjust their own processes. Each electronic shaft can adjust its own process parameters through the feedback of the alignment error, in order to complete the printing work more accurately." Mei xuesong said.
In addition, the team also carried out a large number of experiments on the structure of the oven, heating temperature, wind speed, energy consumption ratio and other factors, and proposed an online fault diagnosis method based on built-in sensors and support vector machines. Each equipment can be networked to achieve dual operation and maintenance control of manufacturers and enterprise users.
In the fierce market competition environment, it is by virtue of excellent technical level, the high-end packaging and printing equipment developed by the team is favored by many enterprise users at home and abroad.
"Now, printing enterprises have bid farewell to the history of using 50 million yuan to buy a printing press, they can buy high-end packaging and printing equipment at one-fifth of the price. According to rough statistics, more than 70% of high-end packaging and printing products in China are manufactured by our products. In other words, the packaging and printing of most of the items you see in supermarkets are made with domestic equipment. We have realized the goal that 'made in China' should have 'Printed in China'!" Mei xuesong said.
High-end packaging and printing equipment belongs to the interdisciplinary results of "complex electromechanical control and high-end packaging and printing". "High-speed and high-precision motion control technology" is the long-term research direction of the innovation team led by Professor Mei Xuesong. In the next step, the team composed of 23 teachers and nearly 200 students will continue to devote to the deep combination of high-speed and high-precision motion control and laser processing technology, and develop high-end CNC machining equipment and intelligent manufacturing system for important industries in line with the major national needs.
