PVA extraction device for PVA-containing wastewater

Abstract

The invention discloses a PVA extraction device for PVA-containing wastewater, the PVA extraction device comprises a rotary drum, a tray and a scraping mechanism, the scraping mechanism comprises a scraper and two water retaining wings, a power screw is rotatably arranged on a vertical-line-shaped supporting table and a T-shaped supporting table through a plurality of groups of bearings, the power screw, a guide sliding rod on the front side and a guide sliding rod on the rear side jointly penetrate through a strip-shaped shifting block, supporting swing arms are correspondingly and rotationally hinged to block bodies of the front end and the rear end of the strip-shaped shifting block respectively, and the other end of the supporting swing arm on the front side is correspondingly and rotationally hinged to a rear wing body of the water retaining wing on the front side, the other end of the supporting swing arm on the rear side is correspondingly hinged to a rear wing body of the water retaining wing on the rear side in a rotating mode. By means of the transmission effect of the supporting swing arms, the angles of the two wings can be freely adjusted according to actual conditions, pertinence is achieved, and therefore the application range is expanded.

Description

technical field [0001] The invention relates to the related technical field of PVA extraction, in particular to a PVA extraction device containing PVA wastewater. Background technique [0002] The printing and dyeing industry is an important part of the textile industry, and it is also the main source of wastewater in the textile industry. A large number of pollutants in printing and dyeing wastewater come from the size used in the sizing process, mainly polyvinyl alcohol (PVA) size. PVA has good adhesion, size film toughness and wear resistance, and is low in cost. Widely used in textile sizing process. However, after the weaving process is completed, the size on the gray cloth will affect the water absorption performance of the fabric, and will also affect the processing quality of the dyed and finished products. Therefore, during dyeing and finishing, the coated size on the fabric must be removed for desizing treatment. [0003] see figure 1 , reference numeral 1 indi...

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Problems solved by technology

[0003] see figure 1 , reference numeral 1 indicates a PVA extraction device of the prior art, a patent on a PVA extraction device containing PVA wastewater disclosed on the patent network, the authorization number is CN201821964728, and its general structure includes a drum, a tray and The scraping mechanism 3, the scraping mechanism 3 as the core structure is composed of a scraper 301 and two hydrofoils 302, the two hydrofoils 302 are respectively corresponding to the two sides of a scraper 301, the gap between the hydrofoil 302 and the scraper 301 is The included angle between them is fixed and cannot be changed. Other structures are described in detail in its patent specification, and will not be repeated here. Although this device can realize the extraction of PVA, there is a defect in this device, that is, due to the water blocking The angle between the wing 302 and the scraper 301 is fixed and cannot be changed, and the two are always kept at the same angle. Once the speed of the drum changes, the splashing water generated by scraping between the scraper 301 and the drum will not be sprayed. Both the speed and the splash range will change. The scraper mechanism 3 with a constant angle in the PVA extraction device of the prior art cannot effectively intercept, and there are limitations in the use of the device, which needs to be improved. In the improved scraper mechanism 4 The hydrofoil 302 and the scraper 301 are independently designed, and the angle of the two wings can be adjusted freely according to different situations, which is targeted, so as to expand the scope of application. Therefore, the present invention provides an improved PVA extraction device

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