A lithographic press is a common printing device used to print on flat objects such as paper, plastic film, etc. It uses lithographic printing technology to transfer the printed pattern to the printing plate, and then transfer the ink through the contact between the printing plate and the printed matter, and finally form the desired pattern or text on the printed matter.
When using PLC to control the lithographic press, the following points need to be noted:
1) Motion control: Lithographic printing machines usually have multiple moving parts (such as printing plate platform, printing head, paper feed system, etc.), and PLC needs to write corresponding programs to control the operation of these moving parts, including the control of speed, position, acceleration and deceleration and other parameters.
2) Sensors and feedback: In order to achieve accurate printing operations, PLC needs to be connected with various sensors (such as photoelectric sensors, position sensors, etc.) and obtain real-time feedback information. These sensors can be used to detect the position of the paper, the position of the printing plate, the amount of ink supplied, etc., in order to realize automatic printing control.
3) Ink supply and control: Ink is an important part of lithography, and PLC needs to control the ink supply system to ensure that the right amount of ink is transferred to the printing plate. This can involve the control of equipment such as ink pumps, valves, flow sensors, etc.
4) Fault detection and alarm: PLC needs to realize the fault detection function, monitor the status of the equipment and send out the corresponding alarm signal when the fault occurs. This helps to identify problems in time and take appropriate measures to ensure print quality and safe operation of the equipment.
5) User interface and operation control: The PLC can be connected with the human-machine interface (HMI) to provide an intuitive operation interface for operators to set up equipment, adjust parameters and monitor. A good user interface design can improve the convenience and efficiency of operation.