JP2504803Y2 - Electrostatic oiling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electrostatic oiling device for applying oil to a strip surface by electrostatic action. More specifically, the present invention relates to a device capable of selectively switching heavy coating oil and light coating oil.

[Prior Art] Comparison of strip surface using electrostatic action to prevent rusting of strip-shaped articles (hereinafter referred to as strips) such as steel and non-ferrous metals, improve printability, and prevent scratches. An electrostatic oiling device for forming a thin oil film is widely used.

In principle, this type of electrostatic oiling device can be roughly classified into an air atomizing type oiling device and an electrostatic atomizing type oiling device.

The former includes an air atomizing mechanism that atomizes oil by using air flow and a drive electrode. Further, there are a charged atomized oil supply system and a non-charged atomized oil supply system depending on whether or not the atomized oil is pre-charged.

This charged atomized oil supply system (for example, Japanese Patent Publication No. 54-17775) uses an air atomization mechanism 10 (chamber 11, atomization chamber 12, oil sump 13, atomizer 14) as shown in FIG. It is composed of a long drive electrode 20 arranged along the slip S and an ionizer 18 for charging atomized oil. A high voltage power supply 25 is connected to the drive electrode 20 and the electrode of the ionizer 18 is charged. Power supply
It is configured to connect 19.

On the other hand, an uncharged atomized oil supply system (for example, Japanese Utility Model Sho 63-358
No. 01 gazette), as shown in FIG. 4 (a horizontal feed type is shown as a vertical feed type for convenience of comparison with other examples), an ionizer (18) is not provided and the air atomizing mechanism 10 is provided with an oil. It has a simple structure including a reservoir 15 and a pickup roller 16.

Therefore, both types are excellent in atomization of atomized oil, and are suitable for carrying out so-called light coating oil having an oil coating amount of, for example, 0.5 / 1 g / m ² . In addition, since the uncharged atomized oil supply method has a slightly coarser particle size, the amount of applied oil can be increased.

However, since both methods are air atomization type and the distance to the drive-in electrode 20 is long, the coating efficiency (stopped at around 70%) is low, and the drive-in electrode 20 is large, so the device is large. There is a drawback.

On the other hand, an electrostatic atomization type oil coating device (for example,
63-46139), as shown in FIG. 5, has a spray head 23 having a slit 22 of several tens of μm and connected to a high-voltage power supply 25.
Is closely arranged so as to face the strip S to be fed, so that the coating efficiency is close to 100%, the apparatus is small, and the amount of oil is suitable for so-called heavy oil coating such as 1 to 5 g / m ^2. . However, since the atomization is carried out by using the electrostatic action, the atomized oil particles are coarse and cannot follow the load fluctuation, especially the light load, and thus the strip S
The thickness of the oil coating film tends to vary in the width direction.

Heretofore, in the case of a strip S that needs to have a very thick oil coating film such as a product for export, an electrostatic atomization type oil coating device suitable for heavy oil coating is conventionally installed to light oil coating. In this case, an air atomization type oil coating device is generally installed.

Therefore, for example, when the electrostatic atomization type is installed and the oil-based treatment is performed, it is inevitable that the oil film variation is tolerated. On the other hand, when the air atomization type is installed and the heavy oil-based treatment is performed, The fact is that the air atomization mechanism 10 must be made very large and the coating efficiency must be reduced.

[Problems to be solved by the invention] However, under the present situation where there is a strong demand for higher quality and smaller equipment, it is difficult to permit the above operations.

That is, in the case of the light oil treatment, the variation in the oil film thickness results in an increase in the degreasing treatment load in the subsequent final product. In consideration of the labor cost, the increase in degreasing processing load, the increase in equipment cost, and the diversification demand that the strip S and oil coating film thickness for each small amount change drastically every time, the above-mentioned operation must be practically abandoned. I don't get.

Therefore, after unavoidably approving the increase in size and cost of the equipment to some extent, conventionally, an air atomization type oil coating device and an electrostatic atomization oil coating device were installed side by side to match light oil coating products or heavy oil coating products. Since either one of them is switched and used, it is a factor that hinders the provision of high-quality and inexpensive high-quality oil strips, and its solution is strongly desired.

It is an object of the present invention to provide an electrostatic oiling device capable of selectively performing both heavy oiling and light oiling, having a small installation space and reducing equipment costs.

[Means for Solving the Problems] The present invention is directed to a spray head of an electrostatic atomization type oil coating unit.
Although the atomizing action and the electrifying action are performed at the same time, if we consider the excluding atomizing action and pay attention to the fact that sufficient electrifying action can be exerted even under a light load etc. The atomization type oil coating unit is also used as a driving electrode and is configured to be capable of selectively switching between light oil coating and heavy oil coating by automatically switching oil supply and the like to achieve the above object. .

That is, according to the present invention, an air atomization type oil coating unit including an air atomization mechanism and a drive electrode is arranged on the upstream side in the strip feeding direction, and a static spray head having a spray head is provided on the downstream side. An electric atomization type oil coating unit is arranged, the drive electrode is formed so that it can also serve as the spraying head, and one of the air atomization type oil coating unit and the electrostatic atomization type oil coating unit is activated. It is characterized in that selection switching means for selectively switching to provide the above is provided, and selective oil supply means for selectively supplying oil to the air atomizing mechanism or the spray head of the selected oil application unit is provided.

[Operation] In the present invention, if heavy oil is selected by the selection switching means, a high voltage power source is connected to the spray head forming the electrostatic atomization type oil coating unit and oil is supplied to the spray head by the selective oil supply means. To be done. Therefore, the charged atomized oil is sprayed from the spray head, and the strip can be heavily coated.

On the other hand, if light coating oil is selected, the selective oil supply means supplies oil to the air atomization mechanism of the air atomization type oil coating unit instead of the spray head, and the selection switching means connects a high voltage power supply to the spray head. It

Therefore, charged or uncharged atomized oil flows out from the air atomization mechanism, and is applied on the strip by the drive-in electrode which also serves as the atomizing head.

Therefore, the heavy oil and the light oil can be switched and selected simply by operating which of the oil applying units is selected by the selection switching means.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

 FIG. 1 is a system diagram, and FIG. 2 is a side view of a main part.

This electrostatic oiling device is equipped with a strip S as shown in FIG.
The air atomization type oil coating unit 1 is arranged on the upstream side in the feeding direction of the above, and the electrostatic atomization type oil coating unit 2 is arranged on the downstream side of the air atomization type oil coating unit 1 and the driving electrode (20) of the former 1 By forming the latter 2 so as to also serve as the spray head 23 and selecting one of the oil coating units by the selection switching means 30, the former 1
It is configured such that a light oiling operation using the above and a heavy oiling operation using the latter 2 can be switched and operated in a one-touch type. In the former case, oil is supplied to the air atomizing mechanism 10, and in the latter case, oil is supplied to the spray head 23. This switching is a selective refueling means that cooperates with the selective switching means 30.
It is designed to be done automatically by 40.

Here, since the basic configurations of the former 1 and the latter 2 are the same as those of the conventional oil coating devices shown in FIGS. 3 to 5, the same or common parts are denoted by the same reference numerals and the description thereof is simplified. To do.

In addition, the former 1 can be implemented as the above-mentioned uncharged atomized oil supply system or the charged atomized oil supply system. In this embodiment, an uncharged atomized oil supply system was adopted.

Now, the air atomization type oil coating unit 1 comprises an air atomization mechanism 10 (oil reservoir 15, pickup roller 16) and a drive electrode (20) as shown in FIG. Is supplied with oil through the oil supply valve 35-1 and compressed air is supplied through the air supply valve 34. In addition, 28 is a high pressure air source. Further, the drive electrode (20) is formed so as to also serve as the spray head 23, and is connected to the high voltage power supply 25 via the power supply connector 33-1.

On the other hand, the electrostatic atomization type oil coating unit 2 is configured with a spray head 23 having a slit 22 as a main constituent element. The spray head 23 is supplied with oil through an oil supply valve 35-2 and a power supply connector 33-2. Is connected to the high voltage power supply 25 via.

Since the spraying head 23 also forms the above-mentioned drive electrode (20), one pair is arranged on both sides of the strip S so as to face each other and two sets are arranged in a row in the feeding direction of the strip S.
Each spraying head 23 is electrically floated by an insulator 21 as shown in FIG. 2 (this device is a horizontal strip feed type, but is shown as a vertical feed type for convenience of comparison with the conventional example). There is.

The power supply connectors 33-1 and 33-2 may be a common unit, but in this embodiment, each of the oil coating units 1 and 2 is provided separately to enable the highest efficiency operation,
At the same time, the high voltage power supply 25 is formed to be able to output different set voltages. Similarly, as shown in FIG. 1, the selective refueling means 40 is a refueling means for the unit 1 (oil tank 41-1 and pressurizing means).
42-1, piping, etc.) and oil supply means for the unit 2 (oil tank 41
-2, pressurizing means 42-2, piping, etc.), and any one of them can be selected for oil supply. The means 40 includes the oil supply valves 35-1 and 35-2.

By the way, the power supply connector 33-3 shown in FIG. 1 is provided for charging the ionizer (18) with electricity when the ionizer (18) is provided in the air atomization mechanism 10 and is carried out as a method for charging atomized oil. It is a thing.

Here, the selection switching means 30, as shown in FIG. 1, is a selection for selectively setting light oil (air atomization type oil coating unit 1) or heavy oil coating (electrostatic atomization type oil coating unit 2). It consists of a switch 32 and a control panel 31, and it is a selected oiling unit 1 or 2.
Is a means for activating. Specifically, oil refueling valves 35-1, 35- that form a part of the selective refueling means 40 from the control panel 31.
Signals SO1 and SO2 for opening and closing 2, signal SA1 for opening and closing the air supply valve 34, power supply connectors 33-1, 33-2, (33-
It is formed to output signals SE1, SE2, (SE3) for turning ON / OFF 3). The drive signals for the pickup roller 16 and the like are omitted in the figure.

 Next, the operation will be described.

(Heavy oiling operation) "Heavy oiling" is selected by the selection switch 32 of the selection switching means 30.

Then, the control panel 31 outputs signals SO2 and SE2. Therefore, the power supply connector 33-2 is turned on, the high pressure power supply 25 is connected to each spray head 23, the pressurizing means 42-2 of the selective refueling means 40 is activated, and the oil supply valve 35-2 is opened. .

Therefore, from each spray head 23, as shown on the right side of the strip S in FIG. 1, the charged atomized oil is sprayed and heavy coating oil can be formed on the strip S.

(Light oiling operation) Select "light oiling" with the selection switch 32.

Then, the signals SO1, SA1, SE1 are output from the control panel 31 this time. Therefore, the pressurizing means 42-1 is activated, the oil supply valve 35-1 is opened, and oil is supplied to the air atomization mechanism 10.
At the same time, the air supply valve is opened and the pickup roller
16 is rotated.

From the air atomizing mechanism 10, as shown on the left side of the strip S in FIG.
It is jetted to the 0) side.

On the other hand, the power supply connector 33-2 is turned on, and a high-voltage power supply is applied to each of the spray heads 23 that act as the drive electrodes (20) this time. The non-charged atomized oil jetted from the air atomization mechanism 10 is applied onto the strimp S by the electrostatic action of the drive electrodes 23 (20) and the strip S.

Thus, according to this embodiment, the air atomization type oil coating unit 1 and the electrostatic atomization type oil coating unit 2 are arranged in this order from the upstream side to the downstream side in the feeding direction of the strip S, Former one
Since the drive-in electrode (20) and the spraying head 23 of the latter 2 can be used in common, and the selection switching means 30 and the selective oil supply means 40 are provided, the light coating oil and the heavy coating oil are provided. It is possible to establish an electrostatic oiling device that can be selectively switched between the two types of operation, has a small installation space, can reduce equipment costs, is easy to handle, and has wide applicability. The coating film quality can be good without any variation.

Further, since the selection switching means 30 is composed of the selection switch 32 and the control panel 31 and is configured so that the selection can be switched by a one-touch operation, the frequent switching between the heavy coating oil and the light coating oil due to the diversification can be quickly performed. And it can be done easily and productivity can be greatly improved.

Furthermore, a power supply connector is provided for each of the 33-1, 33-2,
Since the high-voltage power supply 25 is formed so that the voltage can be changed to the optimum voltage for each operation, the coating efficiency can be improved and the oil film thickness can be made uniform. The selective refueling means 40 also promotes a similar operation.

Furthermore, the storage space of the drive electrode (20) and the spray head 23 that also serves as the drive electrode is small, and only one high-voltage power supply 25 or the like is required, so that the facility cost is light.

[Advantage of the Invention] According to the present invention, the air atomization type oil coating unit is arranged on the upstream side in the strip feeding direction, and the electrostatic atomization type oil coating unit is arranged on the downstream side, and the drive electrode and the spraying head are provided. Since it can be used for both, and both can be selectively switched by the selective switching means, the installation space can be greatly reduced and the burden of equipment costs is light, and heavy oil and light oil can be used together. It has the excellent effect of being able to perform switching operation quickly and easily and dramatically improving productivity.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is a side view of essential parts, FIGS. 3 to 5 are diagrams showing a conventional electrostatic oiling device, and FIG. The atomization type charging system, FIG. 4 shows the air atomization type non-charging system, and FIG. 5 shows the electrostatic atomization type. 1 ... Air atomization type oiling unit, 2 ... Electrostatic atomization type oiling unit, 10 ... Air atomization mechanism, 20 ... Push-in electrode, 22 ...
… Slits, 23 …… Spraying head (drive-in electrode), 25 …… High-voltage power supply, 30 …… Selection switching means, 31 …… Control panel, 32 …… Selection switch, 40 …… Selective lubrication means.

Claims (1)

(57) [Scope of utility model registration request] 1. An electrostatic atomizer having an air atomizing type oil coating unit formed including an air atomizing mechanism and a drive electrode on the upstream side in the strip feeding direction, and having a spraying head on the downstream side. An atomization type oil coating unit is provided, the drive electrode is formed so that it can also be used as the spraying head, and one of the air atomization type oil coating unit and the electrostatic atomization type oil coating unit is activated. An electrostatic oiling device, characterized in that selection switching means for selectively switching is provided, and selection oiling means for selectively oiling the air atomizing mechanism or spray head of the selected oiling unit is provided.