CN209918114U - Metal wire type electrostatic guiding device and powder electrostatic spraying device - Google Patents

Abstract

The utility model discloses a wire formula static guider and powder electrostatic spraying device. The utility model discloses a wire formula static guiding device for in the intermittent or continuous powder electrostatic spraying of slab band, include: the metal wire is arranged along the running direction of the sprayed plate belt in a spraying range; the metal wires are grounded and positioned at two sides of the running direction of the sprayed plate belt and used for adsorbing powder drifted out of the edge of the sprayed plate belt in powder electrostatic spraying. The utility model discloses a wire formula static guider can reduce the slab band spraying face both sides limit portion fringe electric field intensity of operation as far as possible, simultaneously with be taken the powder by the spraying board to reduce the powder that the sprayer spun carries static charge and in the adhesion volume of slab band both sides edge part, reduced the spraying curb plate after toasting area edge film and show the bodiness phenomenon. The discontinuous steel plate and the aluminum plate are stacked in multiple layers and then are flat, and the steel coil and the aluminum coil are not deformed and not warped after being curled in multiple circles.

Description

Metal wire type electrostatic guiding device and powder electrostatic spraying device

Technical Field

The utility model relates to a powder electrostatic spraying field, concretely relates to wire formula electrostatic guidance device and powder electrostatic spraying device.

Background

At present, most of color-coated plates in China adopt a mode of coating plates and coils by solvent type liquid paint. The production line for carrying out powder continuous electrostatic spraying on the intermittent steel plate, the aluminum plate or the steel coil and the aluminum coil is less.

For intermittent steel plates and aluminum plates, a plurality of steel plates and aluminum plates with the same length and width are required to be accumulated and stacked orderly for convenient packaging and transportation of baked color-coated plate finished products after powder spraying, and the number of the steel plates and the aluminum plates reaches hundreds to thousands. This requires that the thickness of the accumulated and stacked plates be consistent, and that the thickness of the powder coating applied to each plate be consistent, which may cause uneven thickness and uneven height of the stacked plates within the length and width range, which may result in irregular and reasonable uniform packaging, and may cause local deformation of the plates due to uneven height, which may result in disqualified spray-coated plate products.

Similarly, for steel coils (strips) or aluminum coils (strips), because the number of turns of coils (i.e., the number of layers) wound into a coil (strip) is hundreds to thousands, if the thickness of the powder coating sprayed on the coil (strip) is inconsistent, the constant-width steel coils wound together have uneven thickness within the width range, the coil diameter is inconsistent, and the appearance is unsightly; in addition, because the plates (strips) bear great tension in the coiling process, the coiled plates (strips) are tightened, and because the steel coils are uneven, the plates (strips) which are uncoiled and expanded later are deformed convexly and concavely, which is not allowed and cannot be used as waste.

In the case of the electrostatic powder-sprayed intermittent sheet and the sprayed continuous rolled sheet, since the sheet and the roll have large areas, the sprayer is required to simultaneously spray a large amount of powder toward the sheet surface. This requires the use of large quantities of compressed air for powder spraying. Because most of the spraying devices are basically vertical to the plate surface and the rolling surface, the sprayed compressed air carries the electrostatic powder to be vertically sprayed to the surface of the steel plate. Most of the powder is attached to the surface of the plate roll, and the powder which is not attached to the surface of the plate roll is pressed by compressed air and can horizontally move along the two sides of the width of the surface of the plate strip to the edge of the width of the plate (strip). At the same time, the edge of the sprayed plate surface is sprayed with powder by a sprayer.

The sprayer has high voltage electrostatic field to make the sprayed powder carry electric charge. The sprayed plate (belt) is grounded, so the powder sprayed by the sprayer and carrying charges is equivalent to the positive (or negative) pole of the power supply, and the sprayed plate (belt) is equivalent to the zero pole. Due to the attraction of the electric field, the powder which is sprayed by the sprayer and carries charges is easily combined with the surface of the sprayed plate (belt) and is adhered to the surface of the plate (belt); and the charged powder adheres more readily to the plate (strip) where the electric field strength is present. Since the electric field is much stronger at the point than at the smooth point for a metal surface, the electric field strength is strongest at the edge of the plate (strip) shaped like a "knife edge" point for the plate (strip) being sprayed. The charge-carrying powder is more likely to collect toward the plate (belt) edges. Therefore, for powder electrostatic spraying, the powder absorbed by the edge of the interrupted steel plate and the edge of the steel coil (strip) is more, so that the paint film at the edge (within 1-2 mm from the edge) of the plate (strip) is obviously thickened after heating and baking, and is much thicker than the surface of the plate.

For the intermittent steel plates and the aluminum plates, hundreds to thousands of steel plates are required to be stacked neatly before packaging and transportation; for steel or aluminum coils, where thousands of layers are wound into a coil, the problem of the coil width being thicker at the edges than in the middle section is prominent! Namely, a plurality of stacked intermittent steel plates and aluminum plates are warped at the upper edge part of the width and are concave in the middle, and cannot be packaged orderly; for steel coils or aluminum coils, edge raised middle concave parts are also obviously generated in the width direction, so that the coils are seriously deformed! In the color coating industry, the color coating is judged to be waste.

In order to reduce the powder floating out of the edge of the plate strip and reduce the adhesion of the floating powder on the edge of the plate (strip), a porous (pipe) suction device is arranged at the edge of the plate (strip) to be sprayed. As shown in fig. 1 and 2, a plurality of powder suction pipes 101 parallel to each other are arranged in a row at a short distance along the edge of the coated sheet strip 2, perpendicular to the running direction 103 of the coated sheet strip. The plurality of powder suction pipes 101 are inserted into a negative pressure main pipe 102.

There are a number of disadvantages with this arrangement. Firstly, as the caliber of the powder suction pipe cannot be set too large, otherwise, the negative pressure drop, the suction force and the powder suction efficiency are low or the diameter of the main negative pressure pipe needs to be very large, and a large pipeline is not suitable to be arranged in the spray room. The floating range of the powder raised by the plate and the edge curling part is larger and far larger than the caliber of the powder suction pipe, so that most of the floating powder cannot be sucked into the powder suction pipe, namely the powder suction effect and the powder suction efficiency of the powder suction pipe are poor. And secondly, the powder suction pipes are arranged in parallel along the main negative pressure pipe, and the negative pressure generating ports of the main negative pressure pipe can be only arranged at two ends of the main pipe or a plurality of negative pressure generating ports are arranged in a limited manner along the length of the main pipe. The negative pressure at the pipe openings of the powder suction pipes along the length direction of the plate strip is different in size, and the difference is large. The uneven powder suction capability along the length direction of the plate strip can be seriously caused. Moreover, most of the prior continuous coil electrostatic powder spraying production lines enter a spraying room in a state that the strip belt is horizontal, and because the continuously sprayed steel coil or aluminum coil horizontally enters the spraying room, the strip belt cannot be provided with a carrier roller or a lifting device, the strip belt naturally hangs and is not straight in the spraying process in the spraying room; and the strip slightly floats in the running process, and for the powder suction pipe openings arranged in parallel on the main negative pressure pipe, the pipe material is a hard pipe, so that the powder suction pipe openings are difficult to be aligned with the edge part of the suspended strip, and the powder suction efficiency is reduced. Thirdly, the electric field at the edge of the plate (strip) cannot be reduced by the method, and the problem that the paint film at the edge of the plate is obviously thickened can hardly be effectively reduced.

Therefore, in order to solve the above problems, it is necessary to reduce the electric field intensity at the edge of the plate (tape) to be sprayed, to remarkably reduce the powder adhering to the edge of the plate (tape) to be sprayed, and to alleviate the above problems.

SUMMERY OF THE UTILITY MODEL

Based on above background art, the utility model provides a wire formula static guiding device and powder electrostatic spraying device. The metal wire type static guiding device is an auxiliary device in the static powder spraying of a plane interrupted steel plate or an aluminum plate or a steel coil or an aluminum coil. The metal wire type electrostatic guiding device is used for the continuous or intermittent powder electrostatic spraying of the plate strip, and can reduce the electric field intensity of the edges of two sides of a spraying surface of the running plate strip as much as possible, so that the attachment amount of powder which is sprayed by a sprayer and carries electrostatic charges on the edges of two sides of the plate strip is reduced; meanwhile, the metal wire is small in section and easy to form a tip on the outline, so that a strong electric field is generated to compete for adsorbing surrounding powder, and the powder falling on the edge of the sprayed side plate strip is reduced, so that the phenomenon that a paint film on the edge of the surface of the sprayed side plate strip after baking is obviously thickened is reduced. The discontinuous steel plate and the aluminum plate are flattened when a plurality of steel plates and aluminum plates are stacked and packaged, and the steel coil and the aluminum coil are not deformed and do not stick up edges after being curled for a plurality of circles.

The utility model discloses in for the convenience of description, used and called for short "slab band", the slab band all indicate plane interrupted steel sheet, aluminum plate, coil of strip (area), aluminium book (area) etc..

In order to realize the above purpose, the utility model adopts the following technical scheme:

an aspect of the present invention provides a wire type electrostatic guiding device for use in the intermittent or continuous electrostatic powder spraying of a strip, the wire type electrostatic guiding device includes: the metal wire is arranged along the running direction of the sprayed plate belt in a spraying range; the metal wires are grounded and positioned at two sides of the running direction of the sprayed plate belt and used for adsorbing powder drifted out of the edge of the sprayed plate belt in powder electrostatic spraying.

The metal wires are arranged along the running direction of the coated plate strip, and then the metal wires are basically parallel to the plate strip. When the plate belt is horizontally suspended, the metal wire is also horizontally arranged; the plate belt and the metal wires are in a natural suspension state, and the state of the metal wires is consistent with that of the plate belt as far as possible.

Optionally, the metal wires are arranged at intervals.

Preferably, the metal wires are arranged at intervals, and the metal wires are parallel to each other.

Preferably, the plurality of the grooves are arranged at equal intervals, and the intervals are 10-150 mm;

or the multiple wires are arranged at unequal intervals, and the intervals are not more than 150 mm.

Preferably, the horizontal distance between one of the metal wires closest to the sprayed plate strip and the edge of the sprayed plate strip is 10-100 mm; namely, when the sprayed sheet strip is hung horizontally, the horizontal distance between one of the plurality of metal wires closest to the sprayed sheet strip and the edge of the sprayed sheet strip is 10-100 mm. When the sprayed plate strip is vertically suspended or obliquely placed, and so on. The metal wire is positioned near the side surface of the sprayed plate strip, so that the aims of competing for drift powder and reducing the electric field intensity of the edge part of the sprayed plate strip are fulfilled.

Preferably, the section of the metal wire is circular, and the diameter of the metal wire is 0.1-6 mm. The wire can also be selected to be triangular, diamond or square in cross section, in which case it is preferable to align the edge of the wire with the strip to be sprayed, so as to ensure that the wire has a sharp enough blade tip near the side of the strip to be sprayed, so as to achieve the purpose of competing for drift powder and reducing the electric field strength of the edge of the strip to be sprayed.

Preferably, the length of the metal wire is 0.5-50 m, so that the metal wire slightly exceeds the spraying range of the sprayed plate strip.

Preferably, the wire-type guiding means comprise two sets of wires located on both sides in the running direction of the strip of coated board.

Preferably, both ends of the wire are fixed by a fixing structure.

Preferably, a vibration device is connected to both ends of the wire.

The utility model discloses another aspect provides a powder electrostatic spraying device, including above wire formula static guiding device.

Drawings

FIG. 1 is a schematic view of a negative pressure powder suction pipe structure used on two side edges of a plate belt in the prior art.

Fig. 2 is a schematic sectional view of fig. 1 taken along a direction a.

Fig. 3 is a schematic structural view (horizontal natural suspension) of the wire type electrostatic guiding device according to a preferred embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of the board strip, wire and spray booth in the direction B of FIG. 3.

Fig. 5 is an installation view of the wire both-end fixing structure shown in fig. 3.

Fig. 6 is a schematic view of the installation of the vibrating device at both ends of the wire shown in fig. 3.

Description of reference numerals:

101-a powder suction pipe; 102-negative pressure main pipeline; 103-running direction of the sprayed plate belt; 1-a metal wire; 2-coated plate strip; 3-vertical distance between the metal wire and the edge of the sprayed plate strip close to each other; 4-distance between wires; 5-a fixed structure; 6-vibration device.

Detailed Description

In order to illustrate the invention more clearly, the invention is further described below with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

The utility model discloses a utility model thinking does: the metal wire is arranged in the spraying range along the running direction of the sprayed plate strip, the metal wire is thin, the edge is equivalent to adding an additional blade-shaped tip near the edge of the sprayed plate strip, the electric field intensity is strong, and the powder adsorption capacity is strong; compete for floating powder with the edges of the coated plate. In addition, because the edge of the metal wire is sharp and is close to the edge of the metal wire, and the metal wire is grounded, weak current can be formed by air passing through the metal wire, and charges accumulated at the edge of the sprayed plate strip are absorbed, so that the electric field intensity of the edge of the sprayed plate strip is reduced, the capability of the edge of the sprayed plate strip for absorbing powder is reduced, and the amount of attached powder is also reduced. Therefore, the problem of thickening of the edge of the electrostatic powder spraying plate is well solved.

From this, the utility model provides an overall scheme does: an electrostatic wire guide for use in the electrostatic painting of continuous or discontinuous powders on a strip, the electrostatic wire guide comprising: the metal wire is arranged along the running direction of the sprayed plate belt in a spraying range; the metal wires are grounded and positioned at two sides of the running direction of the sprayed plate belt and used for adsorbing powder drifted out of the edge of the sprayed plate belt in powder electrostatic spraying. If the sprayed sheet strip is suspended vertically, obliquely or horizontally and horizontally, the laterally arranged wires are correspondingly also vertically, obliquely or horizontally and approximately parallel to it or suspended approximately parallel.

The metal wires are arranged at intervals, and can be arranged on one side or two sides of the sprayed plate strip.

When the metal wires are arranged at intervals, the metal wires can be parallel to each other. Simultaneously, can be for equidistant setting between many, its interval is 10 ~ 150mm, also can be for unequal interval setting, nevertheless its interval is not more than 150 mm.

Preferably, the horizontal distance between one of the metal wires closest to the sprayed plate strip and the edge of the sprayed plate strip is 10-100 mm; that is, when the strip to be painted is hung horizontally, the horizontal distance between one of the plurality of elongated metal wires closest to the strip to be painted and the edge of the strip to be painted is 10 to 100 mm. When the sprayed plate strip is vertically suspended or obliquely placed, and so on. The metal wire is positioned near the side surface of the sprayed plate strip, so that the aims of competing for drift powder and reducing the electric field intensity of the edge part of the sprayed plate strip are fulfilled.

Preferably, the length of the metal wire slightly exceeds the spraying range of the sprayed plate strip and is 0.5-50 m.

Preferably, the diameter of the metal wire is 0.1-6 mm, the section of the thin metal wire can be circular, and the section of the thick metal wire can be triangular, rhombic or square.

Regarding the fixing mode of the metal wire, the fixing structure can be directly adopted at the two ends of the metal wire for fixing, and a vibration device can also be adopted as a connecting mechanism. When the sprayed plate belt is in a vertical state, a vibration mechanism is not required to be arranged.

Specifically, the present invention provides a preferred embodiment, as shown in fig. 3, a wire type electrostatic guiding device for use in the intermittent or continuous electrostatic powder coating of a strip, the wire type electrostatic guiding device comprising: the metal wire 1 is arranged along the running direction of the coated plate strip 2 in the coating range; the metal wires 1 are grounded and positioned at two sides of the running direction of the sprayed plate belt 2 and used for adsorbing powder drifted out of the edge of the sprayed plate belt in powder electrostatic spraying.

As shown in fig. 3, the metal wires 1 comprise two groups located on both sides of the strip 2 to be sprayed, wherein the two sides are symmetrically arranged; it will be readily appreciated by those skilled in the art that the wire 1 may also be configured to be single-sided, or asymmetrical when configured double-sided, depending on the particular spray conditions. In addition, while the strip to be painted in fig. 3 is in a horizontal natural overhang, those skilled in the art will appreciate that the strip to be painted may also be vertical, inclined or horizontal, and the wires are correspondingly vertical, inclined or horizontal and approximately parallel thereto.

As shown in fig. 3, the four metal wires 1 are arranged in parallel, and as is easily understood by those skilled in the art, the number of the metal wires 1 can be a single metal wire or more metal wires, and can be adjusted according to specific effects, and when the plurality of metal wires are arranged, the plurality of metal wires can be arranged at equal intervals, or can be arranged at unequal intervals, and when the plurality of metal wires are arranged at equal intervals, the intervals are 10-150 mm; or when the distance is not equal, the distance is not more than 150 mm.

As shown in FIG. 4, the horizontal distance between one of the metal wires 1 closest to the sprayed sheet strip 2 and the edge of the sprayed sheet strip 2 is marked as 3, which may be specifically selected to be 10-100 mm, so as to ensure that the metal wire 1 is located near the side surface of the sprayed sheet strip 2, and achieve the purpose of competing for drift powder and reducing the electric field intensity at the edge of the sprayed sheet strip.

As shown in fig. 4, the distance of the four wires 1 from each other is marked 4, which may be chosen in particular to be not more than 150 mm.

Preferably, the diameter of the outline of the metal wire is 0.1-6 mm, the thin metal wire can be round, and the cross section of the thick metal wire can be triangular, rhombic or square. This ensures that the side of the elongated wire 1 adjacent to the strip 2 has a sufficiently sharp cutting edge for the purpose of fighting against drift powder and reducing the electric field strength at the edge of the strip.

Generally, according to the actual electrostatic spraying conditions, the length of the metal wire is slightly larger than the spraying range of the spraying plate strip and is 0.5-50 m.

In another preferred embodiment of the invention, as shown in fig. 5, the two ends of the elongated metal wire 1 are fixed by fixing structures 5. Alternatively, as shown in fig. 6, a vibration device 6 is attached to both ends of the elongated metal wire 1.

The spraying plate belt horizontally entering the spraying room is in a natural suspension state due to the fact that the bottom of the spraying plate belt cannot be provided with the carrier roller, two ends of the spraying plate belt are outside the spraying room and can be supported by the carrier roller, two ends of a single wire or a plurality of wires on two sides of the spraying plate belt are supported by the fixing device or the vibrating device, and the two ends of the single wire or the plurality of wires are in the natural suspension state, so that the spraying plate belt can be well parallel, aligned and aligned with the edge of the spraying plate belt.

For the plate strip which runs horizontally or obliquely, because the continuous spraying time of the plate strip is long, if the long metal plate strip is arranged on the side face of the width of the plate strip to be sprayed for electrostatic guidance, a large amount of adhered powder with electrostatic charges is accumulated on the long metal plate strip, and because the accumulated layer is thick, the charges on the long metal plate strip are difficult to convey away through grounding, so that the effect of the metal plate strip on reducing the electric field and the capability of the tip of the edge of the metal plate strip for adsorbing newly sprayed powder are reduced. The metal wire is very thin, so that the powder is not accumulated much, even if more powder is adsorbed, the attached powder can automatically fall off due to the very thin metal wire, and the effect of reducing the electric field is slightly influenced; meanwhile, even if some powder is accumulated and adhered thereon, the wire type both ends have a vibration means by which vibration is generated to vibrate the floating powder accumulated thereon to drop.

The utility model discloses still provide a powder electrostatic spraying device on above basis, including above wire formula static guiding device. Set up in original electrostatic spraying application the utility model provides a wire formula static guiding device can effectively reduce the powder volume of being sprayed the board band edge portion, solves the problem of static powder spraying board limit portion bodiness.

Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or changes based on the above descriptions, and all the embodiments cannot be exhausted here, and all the obvious variations or changes that belong to the technical solutions of the present invention are still in the protection scope of the present invention.

Claims (10)

1. A wire electrostatic guide for use in the electrostatic painting of intermittent or continuous webs of powder, the wire electrostatic guide comprising: the metal wire is arranged along the running direction of the sprayed plate belt in a spraying range; the metal wires are grounded and positioned at two sides of the running direction of the sprayed plate belt and used for adsorbing powder drifted out of the edge of the sprayed plate belt in powder electrostatic spraying.

2. The electrostatic leader device according to claim 1, wherein the wires are spaced apart.

3. The electrostatic leader device according to claim 2 wherein the wires are spaced apart and parallel.

4. The electrostatic guiding apparatus as claimed in claim 3, wherein the plurality of wires are arranged at equal intervals, and the intervals are 10-150 mm;

or the multiple metal wires are arranged at unequal intervals, and the intervals are not more than 150 mm.

5. An electrostatic leader device according to claim 1 wherein the horizontal distance between the closest of the wires to the strip of board being painted and the edge of the strip of board being painted is 10 to 100 mm.

6. The electrostatic guide of claim 1 wherein the wire has a cross-section that is circular, triangular, diamond-shaped, or square.

7. An electrostatic leader device according to claim 1, wherein the electrostatic leader device comprises two sets of wires located on either side of the direction of travel of the strip being sprayed.

8. The electrostatic lead in wire form of claim 2 wherein the ends of the wire are secured by a securing structure.

9. The electrostatic lead in wire form of claim 2 wherein a vibration device is attached to each end of the wire.

10. An electrostatic powder spraying device comprising an electrostatic wire guide as claimed in any one of claims 1 to 9.

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