JPH0454836Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention applies various surface treatments such as anti-corrosion oil to the surface of strip-shaped metal plates such as steel plates, aluminum plates, and copper plates that are continuously conveyed at a required speed. The present invention relates to an electrostatic coating device that electrostatically applies a coating agent.

[Prior art and its problems]

As shown in FIG. 4, for example, a conventional general electrostatic coating device has a coating chamber 4 in which a carry-in port 2 and a carry-out port 3 are formed for carrying in and out a strip metal plate 1 that is continuously conveyed at a required speed. , electrostatic coating machines 5R and 5L are disposed facing each other on both sides of the strip metal plate 1,
The electrostatic coating machines 5R and 5L are used simultaneously to perform double-sided coating, or only one of the electrostatic coating machines 5R and 5L is used to perform single-sided coating.

Each electrostatic coating machine 5R, 5L costs 20,000~
A high voltage of about DC -80 to 120kv is applied to the cup-shaped body 6 which is rotated at a high speed of about 50,000 rpm, and the surface treatment agent supplied to the cup-shaped body 6 is atomized by centrifugal force and electrostatic force. It is made to radiate.

The cup-shaped body 6 is used as a cathode, and the grounded strip-shaped metal plate 1 is used as an anode to form an electrostatic field between the two electrodes. It is attracted to the surface of the metal plate 1 by electric attraction force and electrostatically applied.

By the way, when coating one side of the strip metal plate 1 using only one of the electrostatic coating machines 5R and 5L, the electrostatic coating machine charges and oversprays over the width of the strip metal plate 1. There is a problem in that a part of the surface treatment agent particles coated on the surface of the belt-shaped metal plate 1 go around to the back side of the strip-shaped metal plate 1, which is the non-coating surface.

Therefore, in the past, electrostatic coating machines 5R and 5
L are arranged spaced apart from each other along the conveyance direction of the strip metal plate 1, and at a position facing one electrostatic coating machine 5R with the strip metal plate 1 interposed therebetween, the metal strips L are wider than the width of the strip metal plate 1. A decoy plate 7 formed wide is provided.

That is, a decoy plate 7 is arranged on the other side of the strip metal plate 1 facing one electrostatic coating machine 5R, and the grounded decoy plate 7 is used as an anode, and the cup-shaped body of the electrostatic coating machine 5R is 6 as a cathode, an electrostatic field is formed between the electrostatic applicator 5R and the decoy plate 7, and particles of the surface treatment agent charged and emitted from the cup-shaped body 6 are adsorbed to the decoy plate 7. , the surface treatment agent oversprayed over the width of the strip metal plate 1 is applied to the strip metal plate 1.
This prevents the paint from getting onto the back side of the device.

However, when arranging the decoy plate 7 facing the electrostatic applicator 5R with the strip metal plate 1 in between, the decoy plate 7 must be placed in a place where it does not get in the way of the other electrostatic applicator 5L. Therefore, each of the electrostatic coating machines 5R and 5L must be installed at a predetermined distance from each other along the conveyance direction of the strip metal plate 1, which increases the size of the coating chamber 4 and requires a very wide installation. The drawback is that it requires space.

[Purpose of invention]

This idea was created in view of the above-mentioned circumstances.
The electrostatic coating machines, which are placed facing each other on both sides of the strip metal plate, are installed close to each other along the conveyance direction of the strip metal plate, making the coating chamber much smaller and wider than conventional equipment. In addition to eliminating the need for installation space, even if the electrostatic applicators are installed close to each other in this way, only the electrostatic applicators installed facing each other on one side of the strip metal plate can be used. When coating on one side, the decoy plate on the other side of the metal strip can reliably prevent particles of the surface treatment agent from getting around and being coated on the other side. To provide an electrostatic coating device in which the decoy plate does not get in the way at all when coating both sides of a strip metal plate using an electrostatic coating machine disposed opposite to the other side of the metal plate. The purpose is to

[Structure of the idea]

In order to achieve this objective, the present invention provides a static coating system for applying a surface treatment agent to a strip-shaped metal plate in a coating chamber that is formed with an inlet and an exit for loading and unloading the strip-shaped metal plate that is continuously conveyed. In an electrostatic coating device in which electrostatic coating machines are disposed facing each other on both sides of the strip-shaped metal plate, single-sided coating is performed with an electrostatic coating machine disposed opposite to one side of the strip-shaped metal plate. Preferably, a decoy plate that forms an electrostatic field between the electrostatic coating machine and the electrostatic coating machine is extended to the other side of the band-shaped metal plate.

[Effect of invention]

According to the present invention, when coating one side of the belt-shaped metal plate with an electrostatic coating machine disposed opposite to the other, the decoy plate that forms an electrostatic field between the belt-shaped metal plate and the electrostatic coating machine Since it is configured so that it can advance to the other side, the decoy plate does not get in the way when coating both sides using the electrostatic coating machines installed oppositely on both sides of the strip metal plate. Moreover, in the case of single-sided coating, the decoy plate can be used to reliably prevent the surface treatment agent from adhering to the other surface of the strip-shaped metal plate, which is the non-coated surface. Therefore, the electrostatic coating machines disposed opposite to each other on both sides of the strip metal plate are installed close to each other along the conveyance direction of the strip metal plate,
It is possible to make the coating chamber much smaller than before and to reduce the installation space.

[Example] The present invention will be specifically described below based on an example shown in the drawings.

FIG. 1 is a side view showing an example of an electrostatic coating device according to the present invention.

Note that parts common to those in FIG. 4 are given the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 1, a loading port 2 and a loading port 3 for loading and unloading the strip-shaped metal plate 1 are formed above and below a coating chamber 4 formed of a steel plate or the like. Electrostatic applicator 5R, 5L facing each other
are placed on the left and right.

The electrostatic coating machines 5R and 5L are arranged horizontally with their cup-shaped bodies 6 facing each other with the band-shaped metal plate 1 in between.

Reference numeral 7 denotes a decoy plate formed of metal slats 8, 8, which are wider than the width of the band-shaped metal plate 1, and is normally attached to a winding shaft 9 disposed above the coating chamber 4.
It is wound up and housed in the case 10, and is unwound from the winding shaft 9 when coating one side of the strip metal plate 1 using only the electrostatic coating machine 5R.
While being supported by guide groove members 11 at both ends thereof, it is configured to be lowered into the coating chamber 4 through the carry-out port 3 in the direction of the carry-in port 2.

That is, the decoy plate 7 is lowered in parallel along the other side of the strip metal plate 1 facing the electrostatic coating machine 5R, and is brought to a position facing the electrostatic coating machine 5R with the strip metal plate 1 in between. It is configured to advance and form an electrostatic field between it and the electrostatic coating machine 5R.

In addition, as a means for advancing and retracting the decoy plate 7 to a position facing the electrostatic coating machine 5R, there is a manual method in which the decoy plate 7 is rolled up on a winding shaft 9 that is rotationally driven by a handle, and the thumb piece is rotated to lower the decoy plate 7 by its own weight. A handle winding method may be adopted, or an electric type may be adopted in which the winding shaft 9 is automatically rotated in forward and reverse directions by an electric switch 12 as shown in FIG.

The above is an example of the structure of the electrostatic coating device according to the present invention, and the operation thereof will be explained next.

First, when coating both sides of the strip metal plate 1, the cup-shaped body 6 of each electrostatic coating machine 5R, 5L is driven to rotate at high speed and a high voltage is applied thereto. The surface treatment agent is atomized and radiated, and the strip metal plate 1 is continuously conveyed at a predetermined speed.

As a result, an electrostatic field is formed between the two electrodes, with the cup-shaped bodies 6 of the electrostatic applicators 5R and 5L serving as cathodes and the grounded band-shaped metal plate 1 serving as an anode.
The surface treatment agent particles charged and emitted from the surface treatment agent are uniformly electrostatically applied to both sides of the strip-shaped metal plate 1, which is the opposite pole.

At this time, the decoy plate 7 is wound up by the winding shaft 9 in the case 10 disposed at the upper part of the coating chamber 4 and is housed in the case 10, so it does not get in the way of coating both sides of the strip metal plate 1. It never becomes.

Next, when coating one side of the strip-shaped metal plate 1, the decoy plate 7 is unwound from the winding shaft 9 and is lowered in the coating chamber 4 toward the carry-in port 2 through the carry-out port 3. It is advanced in parallel to the other side of the band-shaped metal plate 1 facing the electrostatic coating machine 5R.

Then, with the electrostatic coating machine 5R facing the decoy plate 7 with the metal strip 1 in between, only the electrostatic coating machine 5R is operated, and the metal strip 1 is continuously conveyed at a predetermined speed.

As a result, an electrostatic field is formed between the two electrodes, with the cup-shaped body 6 of the electrostatic coating machine 5R serving as the cathode, and the grounded strip metal plate 1 and the decoy plate 7 disposed in the grounded coating chamber 4 serving as the anodes. The surface treatment agent particles charged and emitted from the cup-shaped body 6 are attracted to the surface of the strip-shaped metal plate 1 having the opposite polarity and the surface of the decoy plate 7, which is wider than the width of the strip-shaped metal plate 1. and electrostatically applied.

Therefore, the surface treatment agent particles oversprayed beyond the width of the strip metal plate 1 are reliably prevented from going around and being applied to the other surface of the strip metal plate 1 that is not coated. Ru.

As described above, according to this example, only when performing single-sided coating using only the electrostatic coating machine 5R disposed opposite to one side of the strip metal plate 1, the electrostatic coating machine 5R and A decoy plate 7 that forms an electrostatic field between the coating chambers 4 and 4 is configured to be lowered into the coating chamber 4 from above and advanced to the other side of the band-shaped metal plate 1.
When performing double-sided coating using the electrostatic coating machines 5R and 5L, the decoy plate 7 is wound up by the winding shaft 9 disposed outside the coating chamber 4 and completely retracted from the coating chamber 4. Therefore, it is not necessary to install the electrostatic coating machines 5R and 5L apart from each other along the conveying direction of the strip metal plate 1 so that the decoy plate does not get in the way, as in the conventional case, for example, as shown in FIG. It is also possible to install the cup-shaped bodies 6 of the electrostatic coating machines 5R and 5L facing each other, and the coating chamber 4
can be downsized and require very little installation space.

In addition, in the above-mentioned embodiment, a case was explained in which the decoy plate 7 was configured to move forward and backward in parallel along the other surface side of the strip metal plate 1 facing the electrostatic coating machine 5R. The invention is not limited to this, for example, even if the decoy plate 7 is configured to move forward and backward in a direction perpendicular to the other side of the band-shaped metal plate 1 as shown in FIGS. 2 and 3. good.

[Embodiment] That is, FIGS. 2 and 3 are a side view and a plan view showing another example of the electrostatic coating device according to the present invention.

In FIG. 2, an inlet 2 and an outlet 3 for loading and unloading the strip metal plate 1 are formed on the left and right sides of the coating chamber 4, and inside the coating chamber 4, there are static seats facing the upper and lower surfaces of the strip metal plate 1, respectively. Electric coating machine 5U, 5U and 5D, 5
D is placed.

Further, the decoy plate 7 is a rectangular metal plate 21 that is moved forward and backward by the lifting mechanism 20 in a direction perpendicular to the lower surface side of the band-shaped metal plate 1 facing the electrostatic coating machines 5U, 5U.
It is formed of.

The decoy plate 7 made of this metal plate 21 is a belt-shaped metal plate 1
It is formed wider than the plate width of the strip-shaped metal plate 1, and holes 22, 22 are bored through which the electrostatic coating machines 5D and 5D are inserted, which are vertically arranged opposite to the lower surface of the strip-shaped metal plate 1. Two support rods 23, 2 protrude on the left and right sides in the conveying direction of the metal plate 1.
3... is attached to the elevating mechanism 20 via...

The elevating mechanism 20 includes a cylinder 24 installed horizontally at the bottom of the coating chamber 4, and two movable pulleys 26 and 27 installed in parallel with a connecting member 25 attached to the rod head of the cylinder 24 with their spindles parallel to each other. , a fixed pulley 2 fixedly installed below the tip of each of the support rods 23;
8 and 29 (28' and 29'), fixed pulleys 30 and 31 (30' and 31'), and both ends of the chain 32, which is stretched between the fixed pulleys 28 and 29, are fixed at a predetermined position with the ends thereof wrapped around the movable pulleys 26 and 27, respectively. Fixed pulley 28,
Chains 33 and 34, each of which has both ends connected to each support rod 23 of the decoy plate 7, are hung in parallel between the chain 30 and the fixed pulleys 29 and 31, respectively. Although not shown, an endless chain is connected in parallel between the fixed pulleys 28' and 29', and the fixed pulleys 28' and 29' are coaxially connected to the fixed pulleys 28 and 29, respectively. It is supported and interlocked with fixed pulleys 28 and 29, and further between fixed pulleys 28' and 30', and fixed pulley 2
Also between 9' and 31', both ends are connected to the support rods 2 of the decoy plate 7.
Chains connected to 3 are hung in parallel.

Therefore, when coating both sides of the strip metal plate 1, the piston rod of the cylinder 24 is in a contracted state, and the decoy plate 7 has the electrostatic coating machines 5D, 5D inserted into the holes 22, 22, respectively. , as shown by the chain line in FIG. 2, the electrostatic coating machines 5D and 5D are retreated toward the rear end side, which moves away from the lower surface of the band-shaped metal plate 1.

Therefore, each electrostatic coating machine 5U, 5U and 5
D and 5D can be used to coat both sides of the strip metal plate 1 without the decoy plate 7 getting in the way.

Next, when coating one side of the strip metal plate 1, first operate the cylinder 24 of the lifting mechanism 20 to extend its piston rod with a predetermined stroke, and move the movable pulleys 26 and 27 arranged in parallel to the connecting member 25. is moved forward, and the fixed pulleys 28 and 29, on which the chain 32 is stretched, are rotated counterclockwise as seen in FIG.

As a result, the fixed pulleys 30 and 31, which have chains 33 and 34 hooked in parallel with the fixed pulleys 28 and 29, are similarly driven in the counterclockwise direction.
Chain 33 on the exit side of fixed pulleys 28 and 29
The decoy plate 7 attached to 34 via the support rod 23 rises and comes close to the lower surface of the strip metal plate 1 as shown by the solid line in FIG. 2, creating an electrostatic field between it and the electrostatic coating machines 5U, will be advanced to a position where it can form a

In this state, when the surface treatment agent is atomized and radiated from the cup-shaped body 6 using only the electrostatic coating machines 5U and 5U, the surface treatment is oversprayed over the width of the strip metal plate 1. The agent particles are adsorbed to the decoy plate 7 made of the metal plate 21 and are prevented from going around to the lower surface side of the band-shaped metal plate 1.

Therefore, in this example as well, the decoy plate 7 is used instead of installing the electrostatic coating machines 5U and 5U and the electrostatic coating machines 5D and 5D apart from each other in the conveying direction of the strip metal plate 1. One-sided coating can be performed by using the metal strip 1, and the length of the coating chamber 4 in the conveying direction of the strip metal plate 1 can be reduced to reduce the size.

In this example, the cylinder 24 is used as the drive source for the elevating mechanism 20, but an electric motor or the like may also be used.

[Effect of idea]

As described above, according to the present invention, the electrostatic coating machines, which are disposed facing each other on both sides of a strip-shaped metal plate, are installed close to each other along the conveyance direction of the strip-shaped metal plate, The chamber can be made much smaller than conventional equipment and the installation space can be reduced, and even if the electrostatic coating machines are installed close to each other in this way, it will be difficult to coat one side of a strip metal plate. By using the decoy plate, it is possible to reliably prevent the surface treatment agent particles from going around and being applied to the other side of the strip-shaped metal plate, which is the non-applied surface. This has the effect of allowing coating on both sides of the metal plate.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one example of the electrostatic coating device according to the present invention, FIGS. 2 and 3 are side views and plan views showing other examples of the electrostatic coating device according to the present invention, and FIG.
The figure is a side view showing a conventional electrostatic coating device. Explanation of symbols, 1... Band-shaped metal plate, 2... Carrying inlet, 3... Carrying out outlet, 4... Coating room, 5R, 5L,
5U, 5D... Electrostatic applicator, 7... Decoy plate.

Claims (1)

[Claims for Utility Model Registration] (1) An electrostatic coating system for applying a surface treatment agent to a strip-shaped metal plate is installed in a coating chamber that has an inlet and an exit for carrying in and out the strip-shaped metal plate that is continuously conveyed. In an electrostatic coating device in which coating machines are disposed opposite to each other on both sides of the strip-shaped metal plate, when performing single-sided coating with an electrostatic coating machine disposed opposite to one side of the strip-shaped metal plate. An electrostatic coating device characterized in that a decoy plate that forms an electrostatic field between the electrostatic coating device and the electrostatic coating device is extended to the other side of the band-shaped metal plate. (2) The electrostatic coating device according to claim 1, wherein the decoy plate is configured to advance and retreat parallel to the other surface of the band-shaped metal plate. (3) The decoy plate is formed of a metal plate that can be moved forward and backward in a direction perpendicular to the other side of the band-shaped metal plate, and the metal plate has a metal plate on the other side of the band-shaped metal plate. The electrostatic coating device according to claim 1, wherein a hole is provided through which the electrostatic coating devices disposed opposite to each other are inserted.