JPH0123185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrostatic oil applicator that forms a coating of lubricant on a conveyed plate-shaped body that is conveyed at a constant speed.

[Conventional technology]

In general, plate-shaped products such as steel plates, aluminum plates, or copper plates are coated with electrostatic oil particles on their surfaces in the final forming process for the purpose of preventing rust, improving machinability, or preventing scratches during transportation. The method is to form an oil coating.

The reason why electrostatic oil application is performed in this way is that, when using other oil application methods such as a roll coater, a uniform oil film is usually formed on the surface of the plate-shaped article.
g/m ² is required, which makes the degreasing process, which is a pretreatment for secondary processing, time-consuming, and the amount of degreased waste oil increases, causing problems in waste oil disposal. According to electrostatic oiling, 0.001~
A uniform oil film can be formed with an extremely small amount of oil applied, ^around 2.0g/m2, reducing the load in the degreasing process, and at the same time, the amount of oil applied is reduced, significantly reducing the burden of waste oil disposal. This is because it is reduced.

By the way, this type of electrostatic oil applicator in the past has a plate-shaped electrode having a knife-edge tip and to which a high voltage is applied, which is opposed to a conveying plate-shaped object, which is a plate-shaped article being conveyed at a constant speed. The lubricating material is supplied to the upper surface of the plate-shaped electrode to form a liquid film, electrostatically atomized at the knife edge portion, and deposited on the surface of the conveyed plate-shaped body. A method has been proposed (Japanese Patent Publication No. 46-2759 and Japanese Patent Publication No. 49-11855), which does not require conveying air to convey the lubricant when depositing the lubricant on the conveying plate. The coating efficiency on the conveying plate is high, and the amount of lubricant particles flowing out of the device is extremely small, so it has the excellent effect of reducing lubricant consumption and preventing environmental pollution. have.

Furthermore, although insulating mineral oils, chemically synthesized oils, and the like have conventionally been used as lubricating materials, recently, water-soluble antirust oils having electrical conductivity have been developed. This water-soluble rust preventive oil has vaporizability and forms a gas film on the surface of the conveying plate, and the amount of oil applied to obtain the rust preventive effect is 0.05 to 0.1 g/
It requires only a very small amount of about m ² , and since it is water-soluble, it is extremely easy to process in the degreasing process, and is attracting attention as a means of speeding up the production line.

[Problem that the invention seeks to solve]

However, since the water-soluble rust preventive oil has conductivity, when applied to the conventional device described above, the high voltage applied to the plate-shaped electrode that serves as the charged electrode supplies the lubricating material through the water-soluble rust preventive oil. Therefore, all lubricant supply paths must be insulated, which requires equipment costs, and when collecting lubricant to the lubricant supply device. In addition, the voltage drop causes the particle size of the electrostatically atomized lubricant to become coarser than in the case of insulating rust preventive oil, resulting in the inconvenience of having to shut off the high voltage. It had a serious defect in that it could not form an oil film.

In addition, in the case of an electrostatic oil applicator of the type that supplies the lubricant to a plate electrode to which a high voltage is applied and electrostatically atomizes it at the knife edge part, the plate width of the conveying plate may be changed. Since it is not possible to adjust the atomization width of the lubricant particles in accordance with the change in the amount of lubricant particles, for example, when lubricating a narrow conveyor plate, it is possible to prevent the particles from being deposited on the conveyor plate. A large amount of atomized oil particles float inside the oil application chamber, and at the same time flow out from the oil application chamber to the outside, polluting the environment. There was a defect in that particles were concentrated and deposited excessively, resulting in poor oil application.

[Means for solving problems]

Therefore, the present invention makes it possible to uniformly deposit even a conductive lubricating material onto a conveying plate without any problem, and at the same time, even if the width of the conveying plate is changed, The purpose is to provide an electrostatic lubrication device that can prevent the occurrence of oil defects, etc., and in order to achieve this purpose, a charging electrode that charges the lubrication material is arranged opposite to the conveying plate, In the electrostatic oil application device that forms an oil coating on the surface of the conveyed plate-like object, the oil-applied material supply mechanism uniformly flows out the oil-applied material in the width direction of the conveyed plate-like object, and from the said oil-applied material supply mechanism. Charging electrodes that electrostatically atomize the spilled lubricating material are arranged spaced apart from each other, and the conveying plate is placed at a position facing these lubricating material supply mechanism and charging electrodes with the conveying plate body in between. The present invention is characterized in that a lubricant collecting plate is provided to collect lubricant particles that are not deposited on the plate-like body.

〔Example〕

Embodiments of the present invention will be specifically described below based on the drawings.

In the figure, reference numeral 1 denotes a lubricating chamber where conveyed plate-shaped objects 2 such as steel plates, aluminum plates, or copper plates are transported in and out by running in the vertical direction through an inlet 3 and an outlet 4; Plate-shaped body guide rolls 5 and 6 are respectively disposed on the opposing exterior sides.

8L and 8R are plate-shaped charged electrodes arranged on the left and right sides of the conveying plate-like body 2 in the oil application chamber 1,
The edge facing the conveying plate-like body 2 is the conveying plate-like body 2
It is formed on a knife edge 9 parallel to the lubrication chamber 1, and 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. It is connected via a voltage cable 13, and a positive or negative high voltage of 40 to 120 KV is applied.

15L and 15R are lubricating material supply mechanisms disposed in the lubricating chamber 1 at positions above and near the charging electrodes 8L and 8R, respectively, and spaced apart from the respective charging electrodes,
A wide lubricating material guide plate 18 each having a liquid film forming inclined surface 16 that slopes forward and downward toward the conveying plate-shaped body 2 and having a knife edge 17 at the tip, and the lubricating material guide plate. A lubricated material that includes a pipe 20 with a plurality of lubricant spouts 19 provided at the upper outer end of the lubricant 18, and a built-in pump 22 that supplies lubricant to the pipe 20 via piping 21. and a supply source 23, each of which is grounded.

The lubricant from the lubricant 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 conveying plate 2. It is supplied so as to flow from the knife edge 17 to the charging electrodes 8L and 8R.

And the amount of anointing material supplied in this way is
The conveying speed of the conveying plate-shaped body 2 is controlled by the tachometer generator 24.
The detection output is supplied to the drive motor of the pump 22 of the lubricating material supply source 23 via the inverter 25 equipped with a ratio/bias setting device, and the rotation speed of the pump 22 is adjusted to the conveying plate 2. is adjusted to the optimum amount by controlling it in direct proportion to the transfer rate.

In addition, the respective sets of the over-charged electrode 8L and lubricating material supply mechanism 15L, which are provided apart from each other in the vicinity, and the charging electrode 8R and lubricating material supplying mechanism 15R, are disposed vertically and incongruously. , grounded oil-applied material collecting plates 26L and 26R are disposed at positions facing these with the conveying plate-like body 2 in between.

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 predetermined high voltage is applied to each of 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, and at the same time Transfer of the conveying plate-shaped body 2 is started. At this time, the rotation speed of the pump 22 of the lubricant supply source 23 is controlled in accordance with the transfer speed of the conveying plate-shaped body 2, so that the supply amount of the lubricant is optimally adjusted.

Therefore, when a conductive lubricant is used as the lubricant, the lubricant flowing out from the knife edge 17 of the lubricant supply mechanism 15L, 15R is immediately electrostatically charged by the action of the charged electrodes 8L, 8R, respectively. The atomized oil particles are once charged to the charged electrodes 8L and 8R.
side, then deflected toward the conveying plate 2 side and deposited uniformly on the surface of the conveying plate 2, forming a thin oil film on the surface of the conveying plate 2.

According to experiments, a small portion of the atomized oil particles adheres to the surface of the charging electrodes 8L, 8R, but this is atomized again at the knife edge 9 position of the charging electrodes 8L, 8R and transferred to the conveyor plate. It is deposited on the body 2.

In this way, the electrically conductive lubricant is applied to the charged electrodes 8L,
Lubricating material supply mechanism 15 provided apart from 8R
Since the lubricant supply mechanism 15L, 15R and the charging electrodes 8L, 8R are electrically insulated, the high voltage applied to the charging electrodes 8L, 8R is electrostatically atomized by the knife edge 17 of the lubricant L, 15R. There is no risk of voltage leaking to the lubricant supply mechanisms 15L, 15R.

Although it is preferable that the knife edge 17 be an acute angle, it does not necessarily have to be an acute angle if the particle size is not required to be very fine.

Also, the knife edge 17 is omitted and the pipe 20
The lubricating material may be directly flowed out from the spout 19.

Furthermore, a slit may be provided on the edge facing the conveying plate-like body 2, and the lubricant may flow out from the slit.

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

If there is a change in the width of the transport plate 2 to be electrostatically lubricated as described above, the lubricant collecting plates 26L and 26R effectively act to prevent lubricating defects.

That is, when the plate width of the conveying plate-like body 2 is changed to a smaller value, the electrostatically atomized oil particles are removed from the lubricant supply mechanisms 15L and 15R along the width direction of the conveying plate-like body 2. Some of the oil particles are no longer deposited on the conveying plate-like body 2, but the oil particles that are not deposited on the conveying plate-like body 2 are applied to oil particles facing the oil-applying material supply mechanisms 15L and 15R, respectively, with the conveying plate-like body 2 in between. Material collection plate 26L
Since the particles are collected and collected by the charging electrodes 8L and 26R, the atomized oil particles electrostatically atomized and charged by the charging electrodes 8L and 8R may float unnecessarily in the oil application chamber 1, or they may become electrically sharp. It is possible to reliably prevent excessive deposition on the side edges of the conveying plate-like body 2, to make the oil coating on the conveying plate-like body 2 uniform, and at the same time, to prevent the oil from being deposited on the outside of the oil-applied material particles. can effectively prevent the outflow of

〔Effect of the invention〕

As described above, according to the present invention, it is possible to perform thin and uniform electrostatic lubricating on a conveyed plate-shaped body even when using not only an insulating lubricating material but also a conductive lubricating material.
Moreover, even if the width of the conveying plate is changed, there will be no adverse effects such as poor lubrication or environmental pollution, and there is no need for a sprayer with a complicated atomization mechanism, and if conductive lubricant is used. There is no need to insulate the entire lubricating material supply device, which reduces equipment costs, and furthermore, since there is no need for conveying air to carry the atomized lubricant particles, power costs and lubricant consumption can be reduced. It has various excellent effects.

[Brief explanation of drawings]

The figure is a sectional view showing an example of an electrostatic oil applicator according to the present invention. Explanation of symbols, 1...Oil application chamber, 2...Transport plate, 8L, 8R...Charging electrode, 12...High voltage generator, 15L, 15R...Oil material supply mechanism, 26
L, 26R... Oil-applied material collection plate.

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 lubricating material supply mechanism that uniformly flows out the lubricating material and a charging electrode that electrostatically atomizes the lubricating material flowing out from the lubricating material supplying mechanism are disposed at nearby positions and spaced apart from each other, A lubricant collection plate that collects lubricant particles that have not been deposited on the conveyor plate is disposed at a position facing the lubricant supply mechanism and the charged electrode with the conveyor plate interposed therebetween. An electrostatic oil application device characterized by: