Multicolor printing machine control system based on PLC and HMI

Because people for smart printing production methods and diversification of newspaper production put forward higher request, therefore the corresponding of the printing press has also formed a new management concept. In this new printing environment, flexible and consistency as a key requirement, and printing machine control system based on PLC and HMI is able to fully meet the requirements. Multicolor printing machine for easy operation, high accuracy, so its input and output points more, thus adopted double machine communication. PC mainly responsible for the control of main drive, the clutch pressure control, and air pump, valve, etc. , the control of the lower machine mainly responsible for the control of water roll motor, main drive speed control output, the version of the motor data acquisition, etc. Upper machine and lower machine adopted RS485 communication, communication is convenient, and reliable. Chose a touch-screen, at the same time is mainly responsible for water roll motor speed, according to the version shown, and the machine fault display, etc. For multi-color machine, safety factor is very important. In the design, each unit should not only consider the safety control, including the standard unit of scram, security button; Consider convenient operation, each unit shall have excellent, including the button. Therefore, on the one hand, the input point increases a lot; On the other hand, walk line also is not very convenient. Adopts double machine communication, is a good way to solve this problem, the unit can get the line according to the principle nearby, the ark into closer to its control, saves walk the line, is also convenient for control. The stand or fall of printed matter is on the one hand, the precision of machining and installation, on the other hand, also depends on the waterway, the balance of ink road, and the accuracy of the pressure. Each color group, two-color machine, there is water and ink device. In order to facilitate water roller speed regulating, each root water roll with a frequency converter control, at the same time, also need inverter to adjust the main motor speed. Therefore, in order to achieve the multi-channel speed regulation, need to use d/a converter, it would give the digital quantity of PLC, according to the corresponding algorithm, converted into 0 ~ 10 v dc voltage output, well realize the multi-channel speed regulation requirements. In the process of printing, the version is a more complicated process. Especially for multi-color machine, the accuracy of each version for can produce great influence to printing quality. If misregister, print will appear literally overlap or image is not clear. In general, plate axial adjustment range for - 2 mm ~ + 2 mm, weeks to adjust the range of - 1mm～+1mm。 If you are using a manual version, will waste a lot of time, and the accuracy is not high. In order to realize the automatic version, we installed in the version of the roll potentiometer, through the potentiometer to send 4 analog a/D, through PLC controller processing, version roller rotation accuracy can be well controlled within the scope of the play version. The application of touch screen omitted some of the original button, indicator light, counter, tachometer, time relay, and lubrication programmable controller and other components, reduce the failure rate, and the workload of wiring. Touch screen image can be in the form of version offers a wide range of alarm information, and also can design more screen PLC input and output state monitor screen, can also see the machine electrical operation and maintenance in system help prompt in detail, the electrical system of the machine operation, use, maintenance easy and convenient. The system used in the printing press after mass production, found no big problem. PLC functional, reliable, durable, instruction is concise, touch screen and PLC has good generality and can be through the touch screen monitor and modify the program, to designers and users has brought a lot of convenience.
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