Shaftless Printing Machine Control System (I)

I. Overview The system uses PLC as the main control system. The printing roller, ink roller, paper feed roller, and electronic cam are all servo drives. The stepping motor adjusts the gap. The man-machine interface is monitored centrally. The field bus collects and transmits signals. Precision speed reducer, coupling, encoder, slide screw, timing belt and other mechanisms to achieve speed synchronization and phase synchronization of the rollers under high-speed operation, vacuum adsorption electronic cam feed mechanism to ensure fast and accurate feeding, system The phase adjustment function makes adjustment easy. All of these greatly increase the production speed, overlay accuracy and ease of operation.
Second, the system constitutes a brief introduction The system consists of a paper feeder and a four-color printing department. The paper feeding unit mainly includes an electronic cam vacuum suction paper feeding mechanism and a paper feeding roller. The electronic cam vacuum adsorption paper feeding mechanism utilizes the negative pressure generated by the fan to make the paper board tightly adsorbed on the paper feeding platform. The two electronic cam servo motor driven paper feeding platforms synchronously reciprocate between the paper feed lower positions, and cooperate with the paper feed roller and feed paper. The roll completes the cardboard in turn. Based on the stability of the wheel friction coefficient and the cardboard pressure, the timing of paper feeding is related to the position and production speed of the monochromatic printing plate. At a certain speed, when a single printing plate is turned to a certain position, the paper feeding is started and transferred to another position. The paper feed is stopped to ensure that the plate can be accurately printed on the corresponding position of the paperboard each time. Different specifications of the paperboard, send / stop paper timing also changed accordingly, the operator only need to adjust the number of the man-machine interface, the system will automatically adjust immediately to ensure that the printing position is accurate. The operation, speed, and rotation angle of the two electronic cam motors must be exactly the same to ensure the continuous and stable operation of the motor and the mechanism, and the cardboard is sent straight out. Here, we use the two-axis synchronous motion tween function to achieve two-axis real-time synchronization. In addition, the cam motor must meet the long-term frequent reciprocating forward and reverse operation needs, requires the system to match the high response of the servo system, and adjust the servo parameters in combination with the load, give full play to the high-speed high-response characteristics of the servo system, to minimize the drive link and each The link is delayed. At the same time, the system heat and regenerative protection issues must be fully considered so that the motor can be operated under light load conditions. (The schematic diagram of equipment and system structure is as follows)
Equipment composition diagram:

System composition diagram:

After the paperboard is sent out, it enters the four-color printing department. Each color part is controlled by a printing plate roller, an ink roller, a paper roller, a paper roller and an air cylinder. Each roller is directly or indirectly driven by a servo, and a stepping motor is provided at the same time. And encoder adjustment roller gap and position. (To be continued)