Circular screen printing machines can be divided into three types according to the arrangement of the circular screen: vertical, horizontal, and radial. Among them, the most commonly used is the horizontal circular screen printing machine. The rotary screen printing machine is used in combination with other equipment, with a general printing speed of 30 meters/minute to 80 meters/minute. It is widely used for printing cotton fabrics, synthetic and blended fabrics, as well as general knitted and silk fabrics. In order to save wiring and costs, Zhongda Diantong Co., Ltd. has launched a solution for the application of circular screen printing machine system.
The Delta circular screen printing machine system mainly consists of a B-series high-end HMI, network PLC, frequency converter, and intelligent motion control servo A2 to form the main body of the circular screen printing machine. The technical difficulty of this system lies in the synchronous control of the 12 axis circular mesh. The circular mesh host control system based on Delta ASDA A2 series high-performance servo drives has built-in electronic cam function and powerful pulse By pass function to achieve synchronous control of the circular mesh. The motion control program is independently completed by A2 servo, and CANopen network communication is used between the servo and the upper controller. During the operation of the machine, compensation for the printing position can only be achieved by adjusting the circular mesh. If the flower position is ahead, the circular mesh must be slowed down and a negative deviation pulse must be added; If the flower position lags behind, a circular grid acceleration is required, and a positive deviation pulse is superimposed. The difficulty of its process lies in the speed and position size of each stacking, as the thickness of the circular mesh wall is only 0.2 millimeters. If the speed or position of each stacking is too large or too small, there is a possibility of "twisting the mesh" or "breaking the mesh".
Flower pairs are divided into coarse and fine pairs, with coarse pairs including point motion pairs and continuous coarse pairs. Jogging is mainly performed using a cam+PR overlap method, with each time leading or lagging the conduction band
0.3 millimeters; Due to the customer's requirement for a printing accuracy of 0.1 millimeters, the fine alignment is manually completed by the operator with each lead or lag of the guide tape by 0.1 millimeters. Using servo event triggered PR program, the main control HMI is mainly used for data collection, display of equipment data and status, and operation of machine control buttons. In addition to planning basic machine control functions, the circular mesh HMI also adds specification memory and calling functions to the system through human-machine recipe functions. This function can remember necessary information such as the number of color sets for historical specifications, the magnetic strength of each color circular mesh, the size of the circular mesh, and the diameter of the magnetic rod. When users make the same specification again, they only need to call it to complete the relevant settings. This feature is being applied for the first time in domestic circular mesh systems. In order to reduce the burden on the PLC, the calculation of specification parameters is completed using HMI macro instructions.
Practice has shown that the overall solution of Delta's circular network has the following main advantages: the entire control system adopts CAN industrial control bus, which has the characteristics of saving wiring, reducing costs, improving performance, and facilitating maintenance; The circular mesh adopts high-performance motion control servo, and the entire printing motion servo is processed separately; 1kHz response bandwidth, unique dynamic error correction, ensuring no glitches during acceleration and deceleration processes. After on-site testing, the Delta control system can achieve a speed of 80-100 meters per minute and a printing accuracy of ≤ 0.1 millimeters. The successful application of the complete integrated system solution for Delta's circular screen printing machine indicates that Delta has gained a deeper understanding of the process flow of such industry machinery, and can provide low-cost, high-performance, and optimized system solutions for more printing and dyeing industry customers.
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