Plate/strip spray back face powder floating sweeper and electrostatic powder spraying device

Abstract

The invention discloses a plate / strip spray back face powder floating sweeper and an electrostatic powder spraying device. The plate / strip spray back face powder floating sweeper comprises floating roller brushes arranged on a plate / strip spray back face and making contact with the plate / strip spray back face, and the rotating circumference tangent line direction of the floating roller brushes isopposite to the plate / strip operating direction; the two ends of rotary shafts of the floating roller brushes are mounted on independent floating servo mechanisms correspondingly so as to float as a plate / strip floats, and accordingly, bristles of the floating roller brushes are kept always making contact with the plate / strip spray back face; the floating roller brushes include the two side floating roller brushes arranged on the two sides of the plate / strip correspondingly; and the outer side edges of the side floating roller brushes are beyond the edges of one sides of the plate / strip wherethe floating roller brushes are located correspondingly, and angles which are greater than 0 degree and smaller than 90 degrees is formed between the rotary axes of the roller brushes and the plate / strip operating direction correspondingly. By means of the plate / strip spray back face powder floating sweeper and the electrostatic powder spraying device, the roller brush bristles can be guaranteed to make contact with the plate / strip spray back face always; and in addition, the situation that plate / strip edge end powder is brushed away, and paint film protection is lost can be avoided.

Description

technical field [0001] The invention relates to the field of powder electrostatic spraying, in particular to a powder floating cleaning device and a powder electrostatic spraying device on the back side of strip spraying. Background technique [0002] At present, most color-coated panels in China use solvent-based liquid paint to coat panels and coils. There are relatively few production lines for powder continuous electrostatic spraying of intermittent steel plates, aluminum plates or steel coils and aluminum coils. [0003] For electrostatic powder spraying intermittent boards and spraying continuous coiled boards, due to the large area of ​​the boards and coils, the sprayer needs to spray a large amount of powder to the board surface at the same time. This requires the use of large quantities of compressed air when spraying the powder. Since most of the spraying devices are basically perpendicular to the plate surface and roll surface, the sprayed compressed air carries...

AI Technical Summary

Problems solved by technology

[0008] This kind of device has the following disadvantages: (1) because the axis of rotation of the roller brush is perpendicular to the running direction of the strip, and the length of the roller brush with bristles is greater than the width of the strip, then for the plane formed by the rotation of each bristle on the roller brush, which is parallel to the running direction of the strip

(2) Because the strip often floats up and down due to tension adjustment during operation, or deviation occurs due to strip shape and equipment problems, that is, the centerline of the strip deviates from the theoretical centerline it should be on

When it floats upward, it will cause the back of the strip to be sprayed and lifted away from the roller brush, and the brush of the roller brush cannot sweep the back, that is, the whole brush cannot sweep or the single side brush cannot sweep

The powder sprayed on the front is still attached to the back of the strip. In the next back spraying process, if the color of the powder sprayed on the back is different, it will cause color mixing, so that the strip is unqualified and downgraded for use, or becomes a waste product.

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