JPH11216396A - Electrostatic oil coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the mixing of the first oil coating material into the second oil coating material surely by a method in which in an article which is electrostatically applying the first and second oil coating materials selectively to a plate-shaped article traveling in an oil coating chamber, the pressure of the atomization chamber of the second oil coating material atomizer is kept higher than the pressure of the oil coating chamber. SOLUTION: The first and second oil coating material atomizers 10, 20 which can atomize the first and second oil coating materials of different kinds are provided, and the first and second oil coating materials are electrostatically applied selectively to a plate-shaped article W1 or W2 traveling in an oil coating chamber 1. In an electrostatic oil coater, with regard to the second atomizer 20, an internal pressure adjusting means having a transportation air supply source (blower and others) 8 connected to an atomizing chamber 21 through a duct 4 is provided. The pressure of the chamber 21 is kept higher than the pressure of the chamber 1 of the atomizer 10 by air supplied into the chamber 21 of the atomizer 20. By this, the entrance of the first oil coating material into the chamber 21 is hindered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an atomizing chamber having a first oiling material spraying device capable of spraying a first oiling material, an atomizing chamber and a spray port communicating with the atomizing chamber. A second oiling material spraying device capable of atomizing the second oiling material, which interferes with use when the first oiling material is mixed therein, and spraying the sprayed oil through a spray port. The present invention relates to an electrostatic lubricating apparatus capable of selectively electrostatically applying a first lubricating material or a second lubricating material to a shaped article.

[0002]

2. Description of the Related Art Conventionally, in a production line for plate-like articles such as a steel plate, an aluminum plate and a copper plate, atomization is performed to prevent rust, improve machinability, improve printability, and prevent scratches. It is common to form a thin oil film on the surface by electrostatically applying a finely divided oil coating material.

[0003] The oiling material used for forming the oil film varies depending on the properties of the plate-like article and the purpose of oiling. Also,
The amount of oil applied often varies depending on the viscosity of the oil coating material and the like. Here, the amount of oil applied by the conventional electrostatic oil applicator is generally determined by the type of the spraying mechanism, and may be in a small control range (for example, 0.001 to 0.1 g / m 2) or a large amount. Control range (for example, 0.1 to 5.0 g /
Square meters), and with one device,
It is impossible to control a wide range of oiling amount from 0.001 to 5.0 g / m 2. In addition, it is difficult to completely clean the atomizing chamber or the like of the electrostatic oil applying device to completely remove the oil applying material used so far.

[0004] Therefore, it is ideal to provide an electrostatic oiling device suitable for each range of oiling amount. However, arranging, for example, two types of electrostatic oiling devices in a production line is
It is disadvantageous in terms of cost and location.

[0005] Under such circumstances, in a production line in which different types of lubricating materials are switched and used, a separate lubricating material spraying device capable of spraying each lubricating material is provided, and the grid electrode is a common electrostatic electrode. An oiling device is used.

[0006] As shown in FIG.
First oil material spraying device 10 capable of spraying first oil material
And a second oiling device spraying device 20 that can spray a second oiling material different in type from the first oiling material, and the plate-like article (W1, The first oil coating material or the second oil coating material can be selectively electrostatically applied to W2).

The first oiling material spraying device 10 applies a large amount (0.1 to 5.0 g / m 2) of the first oiling material (for example, mineral oil or sewing machine oil) to the plate-like article W1. It is possible and is usually of direct atomization type. Specifically, the first oiling material spraying device 10 includes an oiling material storage chamber (not shown), an oiling material supply rotor (pickup roller 12) partially immersed therein, A plurality of spraying units 13 for removing the oil coating material adhered to the surface of the roller 12 with the rotation of the roller 12, sucking the oil coating material by the supplied air, and atomizing the oil coating material. 46-36115
No.).

The second lubricating material spraying device 20 can lubricate the plate-like article W2 with the second lubricating material in a small amount (0.001 to 0.1 g / m 2). An atomizer 22 disposed in the atomization chamber 21 and capable of atomizing the second oiling material; a spray port 23 communicating with the atomization chamber 21; a charging electrode 25 (case 26, electrode 27); Is formed from.

The atomizer 22 is supplied with a second oil material from the oil material tank 2 at a constant pressure through a pump (not shown), and is supplied with atomizing air from the compressor 3 at a predetermined pressure. You. The atomizing chamber 21 is supplied to the atomizing device 22 by the carrier air of a predetermined pressure supplied from the carrier air supply source 8 (the blower 5, the motor 6, the flow rate control valve 7, etc.) via the carrier air supply duct 4. Spray port 23
Is formed so as to be sprayable upward at a predetermined angle onto the plate-like article W2 in the oiling chamber 1. In addition, the spray port 23
The lubricating material remaining in the atomizing chamber 21 without being sprayed from is returned to the lubricating material tank 2 and circulated.

The oil coating material particles sprayed from the spray port 23 are
After being charged to the negative electrode by the charging electrode portion 25 disposed outside the spray port 23, the negative electrode is repelled by the grid electrode (9, 9) disposed opposite to the plate-like article W2 and charged to the negative electrode. Thus, the electrostatic coating is efficiently performed on the plate-shaped article W2.

[0011]

In the above-mentioned electrostatic oiling device, the first oiling material is sprayed from the first oiling material spraying device 10 and electrostatically applied to the plate-like article W1. During the operation, or after the end of the electrostatic coating operation of the first oil coating material, the work of replacing the plate-like article is performed, and the second oil coating material is sprayed from the spray port 23 of the second oil coating material spraying device 20. Until the spraying starts, the oiling chamber 1
The first atomized oil material floating in the air inside may enter the atomization chamber 21 from the spray port 23.

Here, the first oiling material is a first oiling material.
In some cases, the use of a lubricating material that is difficult to use when it is mixed with a lubricating material is selected. For example, when an oil (dioctyl sebacate) electrostatically applied to the plate-like article W2 for a food can for the purpose of rust prevention or the like is selected as the second oiling material,
If the first oiling material (such as sewing machine oil) is mixed in even a very small amount, it becomes unusable.

When the second oiling material becomes unusable as described above, since the oiling material is circulated in the electrostatic oiling device, a large amount of the second oiling material stored in the oiling material tank 2 is used. 2 must be disposed of, and the circulation path including the tank 2 must be cleaned, which is very laborious and costly.

Therefore, when switching from the first oiling material to the second oiling material, it is conceivable to forcibly discharge the atomized first oiling material floating in the oiling chamber 1. . But,
Since it takes time to completely discharge such oiling material,
The start of electrostatic application of the second oiling material is delayed, resulting in a decrease in application efficiency.

An object of the present invention is to provide an electrostatic lubricating apparatus capable of reliably preventing the first lubricating material from being mixed into the second lubricating material.

[0016]

SUMMARY OF THE INVENTION The present invention provides a first oil coating material spraying device capable of spraying a first oil coating material, an atomizing chamber, and a spray port communicating with the atomizing chamber. A second oiling material spraying device capable of atomizing the second oiling material in the gasification chamber and spraying the sprayed oil from a spray port, wherein the first oiling material or a plate-like article traveling in the oiling chamber is provided. An electrostatic oiling device capable of selectively electrostatically applying a second oiling material, wherein a pressure in an atomizing chamber of the second oiling material spraying device is higher than a pressure in the oiling chamber. Characterized in that an internal pressure adjusting means capable of holding the internal pressure is provided.

In the case of this invention, the operation of spraying the first oil coating material (for example, mineral oil or sewing machine oil) from the first oil coating material spraying device and applying the first oil coating material to the plate-like article traveling in the oil coating chamber. During this process, the internal pressure of the atomization chamber of the second oil coating material spraying device is kept higher than the pressure in the oil coating chamber by the internal pressure adjusting means.

Thus, it is possible to prevent the atomized first oil coating material floating in the air around the spray port from entering the atomization chamber via the spray port.

After the driving of the first oiling material spraying device is completed, the plate-like articles are replaced or the like, and the second oiling material spraying device (for example, a food can) Until the spraying of dioctyl sebacate) is started, the pressure in the atomization chamber of the second oiling material spraying device is maintained higher than the internal pressure of the oiling chamber by the internal pressure adjusting means. Is done.

Therefore, it is possible to reliably prevent the first oiling material from being mixed into the second oiling material.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. The present electrostatic lubricating apparatus is shown in FIGS.
As shown in FIG. 3, the basic configuration is the same as that of the conventional example (FIG. 3), but the internal pressure adjusting means (8) is provided, and the second oiling material spraying device 20 has the first The second oiling material can be prevented from entering.

The same components as those in the conventional example (FIG. 3) are denoted by the same reference numerals, and description thereof will be simplified or omitted.

The internal pressure adjusting means (8) is a means for maintaining the pressure in the atomizing chamber 21 of the second oiling material spraying device 20 higher than the pressure in the oiling chamber 1. In this embodiment, the internal pressure adjusting means includes a conveying air supply source 8 (blower 5, 5) connected to the atomizing chamber 21 via the conveying air supply duct 4.
Motor 6, a flow control valve 7, etc.). Here, the flow rate of the air sucked from the blower 5 driven by the motor 6 is controlled to a predetermined value by the flow rate control valve 7 and is supplied into the atomizing chamber 21. The internal pressure of the atomizing chamber 21 is maintained higher than the internal pressure of the oiling chamber 1 by the air supplied into the atomizing chamber 21.

Here, during the operation of electrostatically applying the first oiling material to the plate-shaped article W1 running in the oiling chamber 1, the first oiling material adhered to the grid electrodes (9, 9) and the like. A situation may occur in which the oil coating material drips onto the second oil coating material spraying device 20. Therefore, even if such a situation occurs, the shielding means 30 that covers the spray port 23 from above so that the first oiling material can be prevented from entering the atomization chamber 21 through the spray port 23 can be prevented. Provided.

The shielding means 30 comprises a second oiling material spraying device 2
This is means for blocking the first spraying material (for example, mineral oil, sewing machine oil) from entering the atomizing chamber 21 by shielding the 0 spraying port 23.

In this embodiment, the shielding means 30 is provided as shown in FIG.
As shown in the figure, the shield plate 31 and the lid opening / closing mechanism 33 are formed. The shielding plate 31 has a base end rotatably held on an outer wall surface 21F of the atomization chamber 22 via a hinge 32 and is formed so as to cover the case 26 of the charging electrode unit 25 from above.

The lid opening / closing mechanism 33 includes a driving cylinder 34,
A wire 35 having one end connected to the distal end of the rod 34R of the drive cylinder 34 and the other end connected to the distal end of the shielding plate 31, and a wire supporting rotating body (36A) supporting an intermediate portion of the wire 35 , 36B), the shield plate 31 can be positioned from the shield position shown by the solid line in FIG. 2 to the open position shown by the two-dot chain line by driving the drive cylinder 34 to retract the rod 34R, and drive the drive cylinder 34. The rod 34R to project the shielding plate 31
Is formed so as to be positioned from the open position to the shield position.

Next, the operation of this embodiment will be described. An operation of spraying a first oil coating material (mineral oil, sewing machine oil, or the like) from the first oil coating material spraying device 10 and electrostatically applying it to the plate-shaped article W1 traveling in the oil coating chamber 1 is performed. During this time, the internal pressure of the atomizing chamber 21 of the second oil coating material spraying device 20 is maintained higher than the internal pressure of the oil coating chamber 2 by using the internal pressure adjusting means (8). Further, the charging electrode unit 2 is
The fifth case 26 is covered from above.

This prevents the first atomized oil coating material floating in the air around the spray port 23 from entering the atomization chamber 21 through the spray port 23. Further, it is possible to prevent the first oiling material attached to the grid electrodes (9, 9) from dripping and entering the atomization chamber 21 from the spray port 23.

After the driving of the first oiling material spraying device 10 is completed, the plate-like articles are exchanged (W1 → W2) and the like, and the second
Until the spraying of the second oiling material (dioctyl sebacate) from the spraying port 23 of the oiling material spraying device 20 is started, the atomizing chamber 21 is controlled using the internal pressure adjusting means (8) and the shielding means 30. Is kept higher than the internal pressure of the oiling chamber 2, and the case 26 of the charging electrode unit 25 is covered from above. As a result, the first oiling material is
1 can be prevented from entering.

The internal pressure adjusting means (8) capable of maintaining the pressure in the atomizing chamber 21 of the second oiling material spraying device 20 higher than the pressure in the oiling chamber 2 is provided. Thus, it is possible to prevent the atomized first oil coating material floating in the air around the spray port 23 from entering the atomization chamber 21 via the spray port 23.

Further, since the internal pressure adjusting means is formed from the existing conveying air supply source 8, parts can be shared, the apparatus can be further reduced in size, and the cost can be reduced.

In addition, since the shielding means 30 capable of covering the spraying port 23 of the second oiling material spraying device 20 from above is provided,
The first oil coating material attached to the grid electrodes (9, 9) can be reliably prevented from dripping and entering the atomization chamber 21 from the spray port 23.

[0034]

According to the present invention, since the internal pressure adjusting means capable of maintaining the pressure in the atomization chamber of the second oiling material spraying device higher than the pressure in the oiling chamber is provided, the spray port is provided. It is possible to prevent the atomized first oil coating material floating in the surrounding air from entering the atomization chamber through the spray port.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

FIG. 2 is also a view for explaining a shielding means.

FIG. 3 is a view for explaining a conventional configuration of an electrostatic oil applying device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lubricating chamber 2 Lubricating material tank 3 Compressor 4 Conveying air supply duct 5 Blower 6 Drive motor 7 Flow control valve 8 Conveying air supply source (internal pressure adjusting means) 10 First lubricating material spraying device 20 Second lubricating device Material spraying device 23 Spray port 30 Shielding means 31 Shielding plate 32 Hinge 33 Lid opening / closing mechanism 34 Drive cylinder 35 Wire 36A, 36B Wire supporting rotating body W1, W2 Plate-shaped article

Claims (1)

[Claims] 1. A first oil coating material spraying device capable of spraying a first oil coating material, an atomization chamber and a spray port communicating with the atomization chamber, and a second oil coating device in the atomization chamber. A second oiling material spraying device capable of atomizing the material and spraying it from a spray port, and selects the first oiling material or the second oiling material for a plate-like article traveling in the oiling chamber. And an internal oil pressure adjusting device capable of maintaining a pressure in an atomizing chamber of the second oiling material spraying device higher than a pressure in the oiling chamber. An electrostatic oiling apparatus characterized by comprising means.