Yielding-water as well as ink automatic control system for offset machine

Abstract

The invention relates to an automatic control system for water and ink supply of an offset press. The system comprises a printing roller, a water-supply component, an ink-supply component, a power assembly to rotate the printing roller, the water-supply component and the ink-supply component, a touch display screen, a pressure-joint sensor, a water-ink supply inductive switch which are connected with the input end of a programmable controller, a frequency converter of a water-ink supply motor, which is connected with the output end of the programmable controller, a frequency converter motor connected with the output end of the frequency converter, a pressure-joint relay, a water-supply relay and an ink-supply relay which are connected with the output end of the programmable controller, electromagnetic valves connected with the output ends of relays, and cylinder pistons connected with the output ends of the electromagnetic valves. The cylinder piston is contacted movably with a swing rod by a supporting block, and one end of the swing rod is connected and fixed with a water-transmission roller or an ink-transmission roller; the frequency converter can control a frequency-converting speed regulating motor which is arranged separately to drive the water-ink supply components to work automatically, and electromagnetic valves can push the cylinder pistons to drive the water-transmission roller and the ink-transmission roller to work automatically, thereby achieving water-ink supplying on demand, realizing the water-ink balance of the printing version and ensuring the effects of high printing quality and energy saving.

Description

Technical field [0001] The invention relates to a control system device of an offset printing machine, in particular to an automatic control system for the water and ink discharge of the offset printing machine. Background technique [0002] The offset printing machine uses the principle of mutual repulsion of oil and water to protect the blank part of the printed image and text so that it does not stick to the ink. The offset printing machine is equipped with a device to wet the printing plate and accurately control the coating amount of the printing plate wetting fluid , Maintaining a good balance of ink and water is an important condition for obtaining high-quality prints. Although the amount of ink supplied to the printing plate, the degree of uniformity, and the stability of the inking system all affect the quality of the printed product, the above-mentioned water and ink devices work separately to achieve the balance of ink and water on the printing plate by separately cont...

AI Technical Summary

Problems solved by technology

Although the device can realize automatic control of ink addition, it does not mention automatic humidification to achieve water-ink balance. As mentioned earlier, maintaining a good water-ink balance on the printing plate is an important condition for obtaining high-quality printed matter, so the automatic control of water addition system is an important aspect of water-ink essential component of balance

In addition, as the area of ​​the printing plate increases and the printing speed increases, the actuator only relies on the relay, which has problems such as small force of the electromagnet, insufficient thrust, lagging response, and easy jamming.

Ordinary AC motor rotates at a constant speed, and the running time of the control motor is inaccurate and easy to lag behind. It is impossible to accurately control the amount of water and ink delivered, and it wastes energy.

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