Degreasing circulating water recycling system for electrophoretic coating

Abstract

The invention provides a degreasing circulating water recycling system for electrophoretic coating. The system comprises a degreasing region and a washing region which are sequentially arranged in theworkpiece conveying direction, wherein a sewage outlet is formed in the degreasing region, and is connected with a filter mechanism; degreasing liquid in the degreasing region flows from the sewage outlet, is filtered by the filter mechanism and flows back to the degreasing region; a water inlet is formed above the washing region and used for providing clear water for the washing region; a firstreverse delivery pipe is arranged between the degreasing region and the washing region, and tilts downwards from the washing region to the degreasing region; a degreasing reverse port and a washing reverse port are formed in the first reverse delivery pipe; the degreasing reverse port is located in the degreasing region, and faces the bottom of the degreasing region; the washing reverse port is located in the washing region and faces the bottom of the washing region. The degreasing circulating water recycling system for electrophoretic coating has the advantages that water and energy consumption in pre-treatment technology before coating can be remarkably reduced, and a higher water use rate and better greasy dirt clearing effect can be achieved.

Description

technical field [0001] The invention relates to the field of electrophoretic coating, in particular to the field of reuse of degreased circulating water for electrophoretic coating. Background technique [0002] Electrophoretic coating is a coating method that uses an external electric field to make the particles such as pigments and resins suspended in the electrophoretic liquid directional migrate and deposit on the surface of the substrate of one of the electrodes. The electrophoretic coating process generally consists of four main processes: pre-coating pretreatment, electrophoretic coating, post-electrophoretic cleaning, and drying of the electrophoretic coating. Among them, the pretreatment process before painting refers to the elimination of various oil stains (such as lubricating oil, emulsion, grease, sweat stains, etc.) and dust on the surface of the object to be coated before electrophoretic painting. At present, the following three problems generally exist in th...

AI Technical Summary

Problems solved by technology

At present, the following three problems generally exist in the pretreatment process before painting: (1) The degreasing and cleaning effect on the workpiece is not good enough, causing the oil stain remaining on the workpiece to enter the next process, and then pollute the bath liquid of other processes, And affect the effect of electrophoretic coating; (2) in order to achieve a better degreasing and cleaning effect, a large amount of clear water is used, resulting in higher water resource consumption and more wastewater discharge, which is not conducive to energy saving, emission reduction and environmental friendliness; ( 3) In order to deal with a large amount of wastewater generated by the pretreatment process before painting, the energy consumption of the process becomes higher and the production cost is increased

However, during the specific operation, the technicians found that the pre-treatment degreasing system still has the problems of large water consumption, high energy consumption of the treatment process, and oil pollution on the workpiece after treatment.

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