JPS6244983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic oil applicator for forming a lubricant coating on conveyed articles.

Generally, during the final forming process of plate-shaped products such as steel plates, aluminum plates, and copper plates, oil particles are electrostatically applied to the surface for the purpose of preventing rust, improving machinability, or preventing scratches that may occur during transportation. to form an oil coating.

The reason why electrostatic oil application is performed in this way is that other oil application devices such as roll coaters usually require an oil application amount of about 3 to 5 g/m ² to form a uniform oil film on the surface. For this reason, the degreasing process, which is a pretreatment for secondary processing, is extremely time-consuming and the amount of degreased waste oil increases, causing problems in its disposal, whereas electrostatic oil coating produces oil of about 0.001 to 2.0 g/ ^m2 . This is because a uniform oil film can be formed with a smaller amount of applied oil, the load in the degreasing process can be reduced, and the amount of oil consumed can be reduced.

Conventionally, this type of electrostatic oil applicator has a plate-shaped electrode with a knife-edge tip and to which a high voltage is applied, which is disposed in parallel to face the transported article, and which coats the upper surface of the plate-shaped electrode. A system has been proposed in which oil is supplied so as to form a liquid film, electrostatically atomized at the knife edge, and deposited on the conveyed article (Japanese Patent Publication No. 46-2759, Japanese Patent Publication No. 49-1982). 11855
When depositing the lubricant on the conveyed article, this does not require conveying air to convey the lubricant, so the coating efficiency on the conveyed article is high and the amount of oil particles flowing out to the outside of the article is also reduced. Since the amount is extremely small, it has the excellent effect of reducing oil consumption and preventing environmental pollution.

By the way, as a lubricant for anointing conveyed goods,
Conventionally, insulating mineral oils, chemically synthesized oils, etc. have been used, but recently water-soluble rust-preventing oils with conductive properties have been developed. This water-soluble rust preventive oil has vaporizability and forms a gas film on the transported goods, and the amount of oil applied to obtain the rust preventive effect is 0.05 to 0.1.
It is attracting attention because it requires only a small amount of about g/m ² and is water-soluble, making it easy to treat in the degreasing process and speeding up the production line.

However, since it has conductivity, when applied to the conventional device as described above, the high voltage applied to the charging electrode will be transmitted to the lubricant supply device through the water-soluble rust preventive oil. All of these supply paths must be insulated, and when replenishing lubricant to the top coat lubricant supply device, which requires equipment for this purpose, there is the inconvenience that the high voltage must be cut off each time. However, the electrostatically atomized coating material particle size was coarser than that in the case of insulating rust preventive oil, and it had a serious defect that a uniform thin oil film could not be formed.

In view of the above, the inventors have conducted various experiments and found that when the charging electrode and lubricant supply device are separated and the lubricant supply mechanism is disposed near the charging electrode, and when insulating oil is used. is once deposited on the charged electrode and atomized by the charged electrode. However, when conductive oil is used, the lubricant is atomized into fine particles at the supply end of the lubricant supply mechanism and the lubricant is atomized by the charged electrode. It was discovered that the lubricant is deposited along the direction toward the lubricated material, and this led to the completion of the present invention, in which a charging electrode for charging the lubricated material is arranged opposite to the conveying plate. , in the electrostatic oil coating device for forming an oil coating on the surface of the conveying plate, an oil coating material supply mechanism that flows out the coating material substantially uniformly in the width direction of the conveyance plate is provided in the vicinity of the charging electrode; It is characterized in that it is arranged at a position apart from the charging electrode, and the lubricant flowing out from the lubricant supply mechanism is electrostatically atomized by the charging electrode.

Therefore, according to the present invention, it is possible to reliably form a uniform thin oil film not only with insulating oil but also with conductive oil, thereby eliminating the drawbacks of conventional devices.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

In the figure, 1 is a plate-shaped body 2 such as a steel plate, aluminum plate, copper plate, etc.
It is an oil application chamber into which oil is carried in and out through a carry-in port 3 and a carry-out port 4 in the vertical direction, and plate-shaped body guide rolls 5 and 6 are disposed outside facing the carry-in port 3 and carry-out port 4. .

8L and 8R are plate-shaped charging electrodes that charge the lubricating material arranged symmetrically with the plate-like body 2 in between in the oil-application chamber 1, and each has an edge facing the plate-like body 2. A high voltage source is formed on a knife edge 9 parallel to the plate-shaped body 2, is attached to the side wall of the oil application chamber 1 insulated from the side wall of the oil application chamber 1 via a support 10 and an insulator 11, and is arranged outside the oil application chamber 1. Connected via high voltage cable 13 to generator 12, positive or negative 40~
A high voltage of 120KV is applied.

15L and 15R are charged electrodes 8L and 15R in the oil application chamber 1,
8R is a lubricating material supply mechanism disposed at a position above and apart from the charging electrode, each having a liquid film forming inclined surface 16 that slopes forward and downward toward the plate-like body 2; A wide oiling guide plate 18 having a knife edge 17 at the tip thereof, a pipe 20 having a plurality of oiling spouts 19 provided at the upper outer end of the oiling guide plate, and Piping the lubricated material 2
1, and a lubricating material supply source 23 having a built-in pump 22, each of which is grounded.

The lubricating material from the lubricating material supply source 23 is supplied to the pipe 20 through the pipe 21, and is uniformly transmitted from the spout 19 on the liquid film forming slope 16 in the width direction of the plate-shaped body 2 to the knife edge 17. Charging electrode 8L,
Supplied to the 8R side. The amount of oil supplied increases the conveyance speed of the plate-shaped body 2 by the tachometer generator 2.
4, and the detection output is supplied to the drive motor of the pump 22 of the lubricating material supply source 23 via the inverter 25 with a ratio and bias setting device, and the rotation speed of the pump 22 is adjusted to the rotation speed of the plate body 2. The optimum amount is regulated by controlling it in direct proportion to the transfer rate.

The above is an example of the configuration of the device of the present invention, and the operation thereof will be explained next.

First, a high voltage is applied to the charging electrodes 8L and 8R, and the lubricant is supplied from the lubricant supply source 23 to the lubricant supply mechanisms 15L and 15R to flow out from the knife edge 17. Start the transfer. The rotation speed of the pump 22 of the lubricant supply source 23 is controlled in accordance with the transfer speed of the plate-shaped body 2, and the supply amount of the lubricant is adjusted.

When a conductive lubricant is used as the lubricant, the lubricant is applied to the charged electrodes 8L, 8R at the knife edge 17 position of the lubricant supply mechanism 15L, 15R.
The atomized particles are immediately atomized into fine particles, and these atomized particles once head toward the charged electrodes 8L and 8R, and are then uniformly deposited on the plate-like body 2, forming a thin oil film on the surface of the plate-like body 2.

Note that a very small portion of the atomized particles is transferred to the charged electrodes 8L, 8.
However, this is atomized again at the knife edge 9 position of the charging electrode and deposited on the plate-shaped body 2.
In this way, the conductive lubricant is supplied to the lubricant supply mechanism 15.
Since it is atomized by the knife edge 17 of L and 15R, the lubricant supply mechanism 15L and 15R and the charging electrode 8
L, 8R are electrically insulated, and charging electrodes 8L,
The applied high voltage of 8R is applied to the lubricant supply mechanism 15L, 15
There is no risk of leakage to R.

Further, when the lubricant is insulating oil, it is atomized by the knife edge 17 of the lubricant supply mechanism 15L, 15R, but once it adheres to the charging electrodes 8L, 8R, the knife edge 9 of the charging electrode The particles are atomized again into fine particles and deposited on the plate-shaped body 2.

In the above embodiment, a case has been described in which the lubricant supply mechanisms 15L and 15R cause the lubricant to flow down in the form of a liquid film and are supplied from the knife edge 17. However, if the fineness of the particle size is not required, it does not necessarily have to be an acute angle, and the lubricating material may be made to flow directly from the spout 19 of the pipe 20. A slit may be provided on the opposite edge to allow the fluid to flow down through the slit.

Furthermore, the charging electrodes 8L and 8R are not limited to plate-shaped electrodes, but may also be mesh-shaped electrodes or linear electrodes.

Furthermore, if there is a change in the width of the plate-shaped body 2, as shown in FIG. , oil-applied material collection plates 26L, 2 grounded at positions facing these with the plate-like body 2 in between.
6R is arranged to collect oil particles 26L, 26R that do not face the plate-like body 2 and are not deposited on the plate-like body 2.
If the atomized oil particles are collected and collected at the top, the charged atomized oil particles will float unnecessarily in the oil application chamber 1 and the oil application material will be excessively deposited on the side edges of the plate-shaped body 2. This is effective in making the oil coating film of the plate-shaped body 2 uniform and preventing oil coating material particles from leaking to the outside.

Furthermore, in the above example, the case where the plate-like body 2 is conveyed in the vertical direction has been explained, but when the plate-like body 2 is conveyed in the horizontal direction, as shown in FIG. For the lubricant supply mechanism 15U, the liquid film forming slope 16 is inclined downward to the left, and for the lower lubricant supply mechanism 15D, the lubricant is supplied from the lubricant supply mechanism 28 having a slit 27 formed inside. The charged electrode 8D is forced out upward, and a charging electrode 8D is placed on both sides or one side above the flow.
All you have to do is set it up.

As described above, according to the present invention, it is possible to thinly, uniformly and reliably apply electrostatic lubricant to a conveying plate using not only an insulating lubricant but also a conductive lubricant, which could not be achieved with conventional equipment. Moreover, since the charging electrode and the lubricating material supply mechanism are separated and insulated, there is no need to insulate the entire lubricating material supplying device, and furthermore, since there is no need for conveying air, the power cost can be reduced. It has the excellent effect of being able to reduce the amount of oil applied, prevent external environmental pollution, and reduce the consumption of lubricating materials.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one example of the electrostatic oil applicator according to the present invention, and FIGS. 2 and 3 are cross-sectional views showing other examples of the apparatus according to the present invention. Explanation of symbols, 1...oiling chamber, 2...plate-shaped body, 8
L, 8R, 8U, 8D...Charging electrode, 12...High voltage generator, 15L, 15R, 15U, 15D...
...Lubrication material supply mechanism, 16...Slanted surface for liquid film formation,
23... Oil supply source.

Claims (1)

[Claims] 1. In an electrostatic lubricating device in which a charging electrode for charging a lubricating material is disposed opposite to a conveying plate-like body and an oil coating is formed on the surface of the conveying plate-like body, in the width direction of the conveying plate-like body. A lubricant supply mechanism that flows out the lubricant substantially uniformly is disposed near the charging electrode and spaced apart from the charging electrode, and the lubricant flowing out from the lubricant supply mechanism flows into the charging electrode. 1. An electrostatic oil applicator, characterized in that it is configured to electrostatically atomize the oil.