JPS6054754A - Electrostatic sprayer - Google Patents

Abstract

PURPOSE:To make a painting pattern easily changeable by attaching a pattern- changing ring for ejecting air for deforming the painting pattern toward a rotary atomizing head in positioning said ring on the rear side of the rotary atomizing head to a body. CONSTITUTION:An electrostatic sprayer consists of a body 1 which has internally a rotation source, a revolving shaft 2 which is pivotally supported freely rotatably with said body and of which one end is fixed to the rotation source and the other end projects to the outside of the body 1 and a rotary atomizing head 3 which is fixed on the other end side of said shaft and sprays pulverized paint. A pattern-changing ring 21 for ejecting air for deforming the painting pattern toward the head 3 is positioned on the rear side of the head 3 and is attached to the body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a static atomizing device in which a coating pattern sprayed from a rotating atomizing head is deformed into an arbitrary shape so as to hang.

Among this type of electrostatic spraying apparatus, those shown in FIGS. 1 to 5 are conventionally known as those in which a large number of air holes are formed in a circular shape as a near ring for forming a coating pattern.

That is, in the figure, 1 indicates the main body of the electrostatic spraying device, and the main body 1 has a built-in rotation source (not shown) such as an air motor or an electric motor. One end of the rotary shaft 2, which is rotatably supported via means such as a bearing or an air bearing, is fixed to the rotation source, and the other end protrudes outside the main body 1.

Reference numeral 3 denotes a bell-shaped rotating atomizing head with a fixed N-shaped awning on the other end side of the rotating shaft 2, and the rotating atomizing head 3 is rotated by a rotation source, for example, 30,
It is rotated at a heavy speed of 000 to 100,000 rpm. 4 is a paint tube, one end of which is connected to a paint source (not shown) such as a paint tank, and the other end is connected to one end of a feed tube 5 on the front end IA side of the main body 1; The other end of the feed tube 5 extends into the rotary atomizing head 3 to supply paint to its wetted surface t1. ing.

7 is located on the back side of the rotating atomizing head 3 and is located at the front end IA of the main body l.
With a nib ring fixed to the side, the near ring 7 has a fan-like shape as shown by arrow A in FIG. In order to blow out expanding shaping air, a large number of air holes 8, 8[deg.]... are bored in a circular shape 4n (see Fig. 2). Further, an annular air chamber 9 is formed in the near ring 7 and communicates with each air hole 8. One end of the air chamber 9 is connected to an air source (not shown), and the other end is connected to the main body 1. Air for pattern forming is supplied through a 10-karat gold air tube connected to the front end IA side of the plate.

On the other hand, 11 and 12 are electrodes (probes) for pattern deformation that are parallel to each other and are placed above and below the main body in the figure through an insulating material, and 13 is a probe whose one end is -30 to -120 (
A high voltage generator (not shown) that generates a high voltage (KV), a connecting wire n, and a high voltage cable f'L'fc whose other end is connected to each pattern deforming electrode 11, 12, the high voltage cable By applying a predetermined high voltage (for example, -90 (KV)) to each pattern deforming electrode 11. ing.

Especially, 14U-1ftM car 30~-120[KV]
(7) A high-voltage cable connected to a high-voltage generator (not shown) that generates voltage A, and whose other end is connected to the main body 1. By applying a high voltage (e.g. -9o [KV]),
The high voltage can be applied to the rotating atomizing head 3 via the rotating shaft 2.

In addition, a conveyor is shown at 15 in the figure, and a large number of hangers 16 are suspended from the conveyor 15, and the objects 17 to be coated are suspended from the hangers 16. A coating work is applied to an object 17 to be coated. Further, 18°18, . . . indicate bolt holes formed in the near ring 7 for attachment to the main body 1.

The electrostatic spraying device according to the prior art is constructed as described above, and is connected from the main body 1 to the rotating shaft 2 via the high voltage cable 14.
A predetermined high voltage (e.g. -90 (KV)) is applied to the rotating atomizing head 3.
is applied, and the object to be coated 17 is held at ground potential.

Meanwhile, the rotary atomizing head 3 is rotated at high speed by the rotation source, and the paint tube 4. When paint is supplied to the liquid contact surface of the rotary atomizing head 3 through the feed tube 5, the paint is turned into a thin film by centrifugal force, and is ejected from the discharge edge as a paint liquid system (casb). By electrostatically atomizing this liquid system, it becomes negatively charged paint particles.

Then, the charged paint particles are transferred to the rotating atomizing head 3 and the object 17 to be coated.
Formed between 1. The particles fly along the lines of electric force E and are coated on the object 17 to be coated.

At this time, most of the charged paint particles adhere to the object 17 along the lines of electric force E, but since the rotary atomizing head 3 is rotating at high speed, some of them are scattered in the direction of centrifugal force. ,
It is not possible to obtain a coating pattern with a uniform coating. Therefore, pattern forming air is supplied to the air chamber 9 of the nearing 7 via the air chive 10, and shaping air A is directed from each air hole 8 toward the vicinity of the discharge edge of the rotary atomizing head 3 in the direction indicated by the arrow in the figure. It gushes out like that. As a result, the coating pattern is wrapped by the shaping air A, and a donut-shaped coating pattern having a circular hole in the center can be obtained as shown in FIG.

By the way, if the object 17 is an inverted object or the body of a JI71 car, an electrostatic spray device is attached to the reciprocating cake,
Painting work is performed while using the electrostatic sprayer FIIF reciprocating VJJ. For this reason, if the coating pattern is donut-shaped as described in 7'c above, there is a problem in that the amount of paint blown out from the edge of the object 17 during reciprocal movement is large and completely reduces the adhesion efficiency. . Furthermore, depending on the size of the overlapping portion of the donut-shaped coating patterns, the thickness of the coating film in the overlapping portion changes, making it difficult to obtain a uniform coating distribution.

In order to solve this problem, pattern deformation electrodes 11 and 12 are attached to the upper and lower positions of the main body l, and each electrode 11.
12, a predetermined high voltage (for example, B-9
0 (KV)) is applied.

As a result, a negative electrostatic field is formed around each pattern deformation electrode 11, 12, and the negatively charged paint particles are repelled by the electrostatic field and escape to the left and right in the figure, as shown in FIG. 0
) As shown in K, it can be transformed into an elliptical or drum-shaped coating pattern with an elliptical hole in the center, the amount of paint blowout is small, the coating efficiency is high, and a uniform coating can be achieved. I can do it.

However, the method using the pattern deforming electrodes 11 and 12 as described above has the following drawbacks. In the first K, the charged paint particles are repelled by the pattern deformation electrodes 11 and 12, and the paint particles escape to the left and right, so that the donut-shaped coating pattern in the fourth prisoner becomes an ellipse as shown in Fig. 5 (A). Or it just transforms into a drum-shaped paint pattern,
As shown in Fig. 5←), the coated raw stone becomes thinner in the center in the left and right directions. As a result, when performing painting work while reciprocating vertically using a reciprocator,
The disadvantage is that the coating film in the central part is very thin compared to the coating thickness in the overlapping parts, and it is not possible to obtain a uniform coating distribution over the entire area. Secondly, it is not only necessary to separately attach the pattern deforming electrodes 11, 12t to the main body 1, but also a high voltage cable 13, a high voltage generator, etc., resulting in a complicated and expensive structure. Third, the pattern deforming electrode 1 is directed toward the rotating atomizing head 3.
Because the electrodes 1 and 12 protrude, when cleaning the rotary atomizing head 3 or repairing or replacing it, the electrodes 11 and 12 may hit the operator's eyes, making it extremely dangerous to work there. There is a drawback that it cannot be used.

The present invention was developed in view of the drawbacks of the electrostatic spraying device according to the prior art described above, and it not only eliminates the need for pattern deforming electrodes, but also provides a large number of air holes for ejecting shaping air for forming paint patterns. This electrostatic coating eliminates the nearing, which is formed into a circular shape, and instead of the nearing, sprays air for changing the coating pattern toward the rotating atomizer head to obtain a coating pattern of the desired shape. The purpose is to provide a device.

In order to achieve the above object, the feature of the configuration adopted by the present invention is that a pattern deforming ring for ejecting a coating pattern deforming air group toward the rotary atomizing head is located on the back side of the rotary atomizing head. The reason is that it is attached to the main body.

The present invention will be described below based on the embodiments shown in FIGS. 6 to 1O. Note that the same components as those in the prior art described above are given the same reference numerals, and their explanation will be omitted.
In the present invention, the pattern deforming electrodes 11, 12, high voltage cable 13, etc. in the prior art are not provided, and also the nearing as shown in FIGS. 2 and 3 is not provided.

However, FIGS. 6 to 9 show a first embodiment of the present invention, and 21 is a pattern deformation ring used in the present invention, and this ring 21 is replaced with the near ring 7 in the prior art as shown in FIG. It is located on the back side of the rotating atomizing head 3 and disposed on the front end IA side of the main body 1. The pattern deforming ring 21 consists of a fixed ring 21A located at the center and fixed to the front end IA, and a movable ring 21E rotatably provided on the outer circumferential side of the fixed ring. Here, as shown in FIG. 7, on the front side of the movable ring 21B,
In order to transform the coating pattern sprayed from the rotary atomizing head 3 into an elliptical or drum-shaped coating pattern, a large number of air holes 22A, 22A, .
. . , 22 B, 2.2 B, .
B are collectively referred to as "air holes 22"), and each air hole 22
Air for pattern modification is ejected from the rotary atomizing head 3 as indicated by arrow B in FIG. Therefore, unlike the near ring 7 in the prior art, the pattern deforming ring 21 of the present invention has a pattern on the left side in the figure with respect to the axial center.

Air holes are not drilled in the right position. Further, an annular air chamber 23 communicating with the air hole 22 is formed on the back side of the movable ring 21B, and the air tube 1 is connected to the air chamber 23.
Air for pattern deformation is supplied through 0. Additionally, 24°24... is the fixing ring 21
A bolt hole for mounting to the main body 1 formed in a circular shape,
The front outer periphery of the fixing ring 21A surrounding each of the bolt holes 4 is a tapered surface 25. On the other hand, the inner periphery on the front side of the movable ring 21B also forms a tapered surface 26, and by tightening a bolt (not shown) into the bolt hole 24, the tapered surface 25
．． The movable ring 21B'i is configured in a nine-point configuration such that the movable ring 21B'i can be fixed by being engaged with the movable ring 21B'i.

The present embodiment is constructed as described above, but similarly to the prior art, the rotary atomizing head 3 is rotated at high speed and a high voltage is applied, and paint is supplied to the surface in contact with the liquid. As a result, the charged paint particles atomized 7'' from the rotary atomizer head 3 are formed by electric lines of force Et between the rotary atomizer head 3 and the object to be coated 17.
c, and coats the object 17.

Accordingly, pattern deforming air is supplied to the air chamber 23 of the pattern deforming ring 2j via the air tube 10. However, the pattern deforming ring 21 has arcuate air holes 22A only at the upper and lower positions.

22 A, ...-122B,, 22B v"'
7>"The coating pattern, which is supposed to be donut-shaped as shown in Figure 4, is not pressed by the pattern-deforming air ejected from the upper and lower positions.
, it is possible to obtain an elliptical coating pattern containing long grooves in the longitudinal direction of the center as shown in FIG. 9(a).

In this way, the pattern deforming electrode 11 of the prior art is
．． 12, which allows charged paint particles to escape to the surrounding area, the present invention utilizes the air pressure of the pattern deforming air ejected from the air hole 22 via the pattern deforming ring 21, and uses the air pressure of the pattern deforming air as shown in FIG. 9 (a). Since the coating pattern is to be transformed into the one shown in Figure 9, the circular hole at the center is also pressed flat, resulting in a long groove shape as shown in the figure, and the coating thickness is uniform as shown in Figure 9←)K. be able to. Therefore, even if the painting operation is performed while reciprocating in the lateral direction using the reciprocator, a uniform coating film can be obtained over the entire surface.

On the other hand, in order to change the position of the air hole 22, loosen the bolt fastened in the bolt hole 24, release the engagement force of the tapered surface 25 with the tapered surface 26, and then move the movable ring 21H.
Rotate by t-θr desired angle. Then, by tightening the bolts again to fix the movable ring 21B, the direction 1 of the coating pattern can be changed.

Next, FIG. 10 shows a second embodiment of the present invention, and the feature of this embodiment is that a movable ring 311JK serves as a pattern deformation ring 31 for blowing out pattern deformation air, and a movable ring 311JK is arranged in the figure with respect to the axis center. Air slits 32A, 3215' (iH drilling μ or less, air slits F 32 A * 32 B'l - collectively referred to as [air slits, ) 32J and A5) with monthly income of 32A and 3215' on the left and right positions, from the air slits 32 The structure is such that air is ejected in a pattern-deformed amount toward the rotating atomizing head 3. 33.33°...is fixed ring 3
1A is a port hole for attachment to the main body 1.

The present embodiment is configured as described above, but the pattern deformation ring 31 is attached to the present case 1, and the left and right air slits 32 are attached.
By blowing out pattern-deforming air from A and 32B, it is possible to transform the coating pattern shown in Figure 9 (A) into a vertically elongated coating pattern with the turns rotated by 90 degrees, and a uniform coating film can be obtained. .

In addition, in the first embodiment, the pattern deformation ring 21 is composed of a fixed ring 21A and a movable ring 21115, and by tightening the bolts in the bolt holes 24, the tapered surface 2
5.26 is engaged to fix the movable ring 21Bt, and by loosening the bolt, the movable ring 21Bt can be rotated. However, the pattern deformation ring 21 is formed of a single member, and the deformation ring The coating pattern may be configured to be rotatably attached to the main body 1 so that the coating pattern can be changed or omitted in a desired direction. Also, the second
The same applies to the embodiment.

As described in detail above, the electrostatic spraying device according to the present invention has a structure in which a coating pattern is deformed into a desired shape by a pattern deformation ring, and then a pattern deformation electrode (probe) is used as in the prior art. Compared to what is used, the film thickness distribution can be made completely uniform, and pattern deformation can be performed with an extremely simple configuration. Furthermore, safety can be ensured during cleaning work and repair/replacement work, and there is no risk of short-circuit accidents or the like. Further, by simply selecting the shape of the air holes or air slits in the pattern deformation ring, it is possible to easily change the shape of the coating pattern.

[Brief explanation of the drawing]

Figures 1 to 5 show an electrostatic spraying device according to the prior art. Figure 1 is its overall configuration, Figure 2 is a front view of the near ring, and Figure 3 is indicated by the ■-■ arrows in Figure 2. Directional sectional view, 4th
The figure shows a plan view of the coating pattern when only shaping air is used, FIG. 5 shows the coating pattern when nearing and pattern deformation electrodes are used together, and FIG. ←) is a sectional view showing a coating film atomic bomb, FIGS. 6 to 8 are a first embodiment of the electrostatic spraying device according to the present invention containing water, FIG. 6 is the overall structure Ib, and FIG. A front view of the pattern deformation ring, Fig. 8 is a cross-sectional view in the direction of the ■-■ arrow in Fig. 7, Fig. 9 shows the conversion pattern when the pattern deformation ring is used, and Fig. 9 0) is its plane. 9) is a sectional view showing the entire thickness of the coating film, and FIG. 10 is a front view showing a second embodiment of the pattern deformation ring used in the present invention. 1... Main body, 2... Rotating shaft, 3... Rotating atomizing head,
4...Paint tube, 5...Feed tube, 1
0... Air tube, 14... High voltage cable, 1
7... Uncoated object, 21.31... Pattern deformation ring, 22... Air hole, 23... Air chamber, 32... Air slit. Figure 2 Figure 3 Figure 4 Figure 5 (b)

Claims (3)

[Claims] (1) A main body having a rotation source inside, a rotary shaft rotatably mounted on the main body, a rotating shaft having one end fixed to the rotation source and the other end protruding outside the main body, and the other end of the rotating shaft End side fixation n1
In an electrostatic spraying device comprising a rotating atomizing head that sprays atomized fLfc paint, a pattern deforming ring for ejecting paint pattern deforming air toward the rotating atomizing head is attached to the rotating atomizing head. An electrostatic spraying device characterized in that it is attached to the main body at a rear side. (2) The pattern deformation ring has arc-shaped air holes or air slits facing each other at the top, bottom, left, and right positions with respect to the center of the axis, so that the coating pattern can be changed. An electrostatic spraying device according to claim (1), which is configured to blow out deforming air. (3) The electrostatic spraying device according to claim (1), wherein the pattern deformation ring is composed of a fixed ring and a movable ring located on the outer peripheral side of the fixed ring.