Circulating ink supply system

Abstract

The embodiment of the invention discloses a circulating ink supply system. The circulating ink supply system comprises an ink supply pipeline and an ink return pipeline, and circulating ink supply iscompleted through an ink barrel, an ink-jet printing head set, a proportional valve set, an ink supply pressure generating device and an ink return pressure generating device. By controlling the pressure at the two ends of a printing head and the ink supply proportion, so that the pressure on a nozzle plate on the printing head is stable, stable work of the printing head is guaranteed, the printing quality is guaranteed through the proportional valve device, the structure of the circulating ink supply system is optimized, the proportional valve easily controls the pressure at the two ends of the ink-jet printing head, the printing quality is guaranteed, and practicability is higher.

Description

technical field [0001] The embodiment of the present application relates to the technical field of ink supply for printing machines, and in particular to a circulating ink supply system. Background technique [0002] In the process of rapid development of digital inkjet printing technology, the print nozzle has become a core limiting factor. Usually, the ink supply method is used to supply ink to the nozzle, so that impurities, air bubbles, waste heat, etc. in the nozzle can be taken out through the ink circulation. Prevent print head from being clogged or overheated or too cold to affect print quality. At the same time, the circulating ink supply method can also ensure the stability of ink viscosity. [0003] In the prior art, the air pressure method or the differential pressure method is usually used for circulating ink supply. Among them, the air pressure method is to adjust the pressure difference between the two ends of the print head by switching and controlling the ...

AI Technical Summary

Problems solved by technology

Among them, the air pressure method is to adjust the pressure difference between the two ends of the print head by switching and controlling the high and low pressure air source to enter the ink supply box to realize the ink output. However, there will be a large number of air paths in the system through air pressure adjustment, resulting in high complexity of the system. , if a system failure occurs, it may also cause ink to enter the air circuit, causing damage to the air circuit components, which is not conducive to the reliable operation of the ink supply system; and the differential pressure method is to generate a pressure difference through an adjustable speed ink pump to control the circulating ink supply , this method does not have an air path, so it solves the disadvantages of the air pressure method, but the distance from the nozzle to the ink supply pump and the ink return pump in the general system is relatively long, and there may be multiple nozzles in the system, which increases The complexity of the system makes it difficult to control the pressure and flow of the ink passing through the print head, thus affecting the printing quality

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