JPS63162056A - Electrostatic oil coating machine - Google Patents

Abstract

PURPOSE:To efficiently supply a constant amount of oil in a cup-shaped body and to surely prevent the unevenness of oil coating, by adsorbing the particles of coating oil agent discharged from a coating oil discharge nozzle to the inside of the cup-shaped body by the moving action of ion in a electric field. CONSTITUTION:A specified amount of the coating oil agent is supplied from the coating oil agent discharge nozzle 8 to the inside of the cup-shaped body 6 which a high voltage is impressed to and is revolved at a high speed to electrostatically pulverize. In this case, the nozzle 8 is made of an electric conductive material, and is mounted to be electrically isolated from the electrostatic oil coating machine body to form a certain electric field between the nozzle 8 and the cup-shaped body 6 so that the liquid particles are adsorbed to the cup-shaped body 6. As a result, even when an extremely small amount of the coating oil agent is continuously discharged from the nozzle 8 in a pulverized state, the particles of coating oil agent are efficiently supplied with a constant amount to the inside of the cup-shaped body 6 without splashing by the cup-shaped body revolving at a high speed with a result that the unevenness of oil coating is surely prevented.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is designed to prevent static electricity by supplying lubricating agents such as rust preventive oil and lubricating oil in a fixed amount into a cup-shaped body to which a high voltage is applied and which is driven to rotate at high speed. This invention relates to an electrostatic oil applicator that atomizes and adsorbs the atomized oil onto the surface of a metal plate such as a steel plate, an aluminum plate, or a copper plate using electrostatic force to form a thin film.

[Conventional technology]

For example, the strip-shaped steel plate used as can material for freezing is
Rust-preventing oil is used for the purpose of rust prevention in the final molding process and to improve machinability such as press processing.

A thin film is formed by applying a lubricant such as lubricating oil.

By the way, in the can manufacturing work using such steel plates, there is a printing process in which printing is performed directly on the thin film formed on the surface of the steel plate, and a final cleaning process to remove oil film, dirt, etc. from the surface of the steel plate. There is a degreasing process, etc., and in order to improve the adhesion of printing ink and facilitate the degreasing process, it is desired that the oil film formed on the surface of the steel plate be as thin and uniform as possible.

For this reason, conventional electrostatic oil applicator T° as shown in Fig.
is used. This is normally carried out from a DC high voltage generator 1 via a high voltage cable 2.

C, (-) 80 to (-) An air motor 4 is built in the main body 3 to which a high voltage of about 120 Kv is applied, and the rotating shaft 5 of the air motor 4 is protruded from the tip of the main body 3, and the rotation A cup-shaped body 6 is fixed to the protruding end of the shaft 5.

The high voltage applied to the main body 3 of the electrostatic oil applicator T' is directly applied to the cup-shaped body 6 via the rotating shaft 5, and is also connected to the lubricant supply hose 7 connected to the main body 3. The lubricant is supplied in a fixed amount from the lubricant discharge nozzle 8.

As a result, an electrostatic field is formed between the two electrodes, with the metal plate K such as a strip-shaped copper plate, which is continuously conveyed in a grounded state, as the positive electrode and the cup-shaped body 6 of the electrostatic oil applicator T as the negative electrode, and the lubricant is discharged. The lubricant supplied from the nozzle 8 into the cup-shaped body 6 is atomized by electrostatic force and centrifugal force, becoming negatively charged fine lubricant particles, which are then applied to the surface of the opposite metal plate by electrostatic force ( It is possible to form a very thin oil film on the surface of the metal plate by adsorption (electrostatic attraction).

[Problem that the invention seeks to solve]

However, in recent years, the amount of lubricant electrostatically applied to the surface of a metal plate is, for example, 0.05 to 0.1 g/Cl11.
There is a strong demand for extremely light coating oil that forms an ultra-thin oil film, such as:
Since it is necessary to control the amount to an extremely small amount of /win,
It is no longer possible to supply the lubricant in the form of droplets from the lubricant discharge nozzle 8 to the cup-shaped body 6.

That is, the amount of lubricant supplied to the cup-shaped body 6 is approximately 15 c.
c/min or less, the lubricant must be supplied drop by drop using a normal lubricant discharge nozzle, and the lubricant cannot be continuously supplied, and the lubricant is intermittently discharged from the cup-shaped body 6. This causes a so-called breathing phenomenon, resulting in uneven oil application.

Furthermore, when the supply rate of the lubricant is about 0.5 to 1 cc/min, the time interval for the lubricant to drip from the lubricant discharge nozzle into the cup-shaped body 6 is about 10-odd seconds, and the surface of the metal plate is It becomes impossible to form a uniform oil film on the surface.

For this reason, the present applicant has attempted a means of providing the lubricating agent discharge nozzle 8 with, for example, an atomizing mechanism to continuously atomize a very small amount of the lubricating agent little by little and supplying the atomized quantity into the cup-shaped body 6 (
See Japanese Patent Application Laid-open No. 145063/1983. ) However, in this case as well, some of the lubricant particles atomized and discharged from the lubricant discharge nozzle 8 are bounced off by the cup-shaped body 6 rotating at high speed and are not attached to the inner surface of the cup-shaped body 6. At the same time, it becomes difficult to supply the lubricant in a constant quantity, causing uneven lubricating, and at the same time, the lubricant particles splashed out of the cup-shaped body 6 adhere to the surface of the main body 3 of the electrostatic lubricator T" and form droplets. Under the influence of high voltage, these become coarse lubricant particles that fly out in the direction of the metal plate, and are adsorbed to the surface of the metal plate, creating a thick oil film called an oil spot, which can lead to poor lubricating. It turned out to be happening.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electrostatic oil applicator in which a lubricant discharged from a lubricant discharge nozzle is adsorbed into a cup-shaped body without being bounced back to the cup-shaped body and is reliably supplied. .

[Means for solving problems]

In order to achieve this object, the present invention provides an electrostatic lubricant that supplies a certain amount of lubricant from a lubricant discharge nozzle into a cup-shaped body to which a high voltage is applied and is driven to rotate at high speed, and electrostatically atomizes the lubricant. In the machine, a lubricant discharge nozzle is formed of a conductive material and is provided insulated and separated from the main body of the electrostatic lubricant, and a certain potential difference is created between the lubricant discharge nozzle and the cup-shaped body. It is characterized in that an electric field is formed to cause particles or droplets of the lubricant discharged from the lubricant discharge nozzle to be attracted to the cup-shaped body.

[Effect]

According to the present invention, since particles or droplets of the lubricant discharged from the lubricant discharge nozzle are adsorbed into the cup-shaped body by the ion movement effect of the electric field, a very small amount of lubricant is continuously discharged from the lubricant discharge nozzle. Even when the lubricant particles are atomized and discharged, they are efficiently and quantitatively supplied into the cup-shaped body without being bounced back by the centrifugal force of the cup-shaped body, reliably preventing uneven lubricating. be done.

〔Example〕

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

FIG. 1 is a side view showing an example of an electrostatic oil applicator according to the present invention;
FIG. 2 is a rear view of the cover that houses the electrostatic oil applicator.

Note that parts common to those in FIG. 3 are given the same reference numerals and detailed explanations are omitted.

The electrostatic oil applicator T shown in FIG. 3. High voltage cable connected to 2. The lubricant is prevented from adhering to the lubricant supply hose 7 and the like.

The lubricant discharge nozzle 8 is made of a conductive material such as a metal pipe with a diameter of about 1 to 3 mm, and is arranged along the inner surface of the cover 9 made of an insulating material together with the lubricant supply hose 7. , are spaced apart from the main body 3 of the electrostatic oil applicator T.

That is, the lubricant discharge nozzle 8 is inserted into the cylindrical part 9a of the cover 9 that accommodates the main body 3 of the electrostatic oil applicator T from the rear end side, and is spaced apart from the main body 2 and is inserted into the inner surface of the cylindrical part 9a. It is fixed by a nozzle fixing fitting 10 fixedly attached to the nozzle.

The nozzle fixing fitting 10 is provided with a nozzle insertion hole 11 that supports the lubricant discharge nozzle 8 so as to be movable forward and backward with respect to the cup-shaped body 6, and fixes the lubricant discharge nozzle 8 inserted into the nozzle insertion hole 11. The position can be adjusted using a set screw 12.

The nozzle fixing fitting 10 also includes a main body 3 of the electrostatic oil applicator T.
For example, a resistor 13 of about 250 MΩ is connected between the
is connected to the electrostatic oil applicator T via the high voltage cable 2.
From the high voltage generator 1 to the main body 3, C, (=) 8
When a high voltage of 0 Kv is applied, the nozzle fixing fitting 10
The lubricant discharge nozzle 8 fixed to is approximately C, (-)
A high voltage of about 76 Kv is applied to create a potential difference of about 4 KV between the lubricant discharge nozzle 8 and the cup-shaped body 6, and the difference between the discharge port 8a of the lubricant discharge nozzle 8 and the cup-shaped body 6 is During this time, an electric field is formed that causes particles or droplets of the lubricant discharged from the discharge port 8a to be attracted to the inner surface of the cup-shaped body 6.

Note that the discharge port 8a of the lubricant discharge nozzle 8 which is on the high potential side
The distance between the inner surface of the cup-shaped body 6 on the low potential side can be determined by adjusting the fixing position of the lubricant discharge nozzle 8 with respect to the nozzle fixing fitting 10 with the set screw 12.
The optimum interval can be selected to form an electric field that effectively attracts the lubricant discharged from the inner surface of the cup-shaped body 6, and in this example, it is selected to be about 2 to 311. There is.

The cover 9 also has a cylindrical portion 9a with open front and rear end surfaces.
and a fin-shaped case portion 9b integrally protruding along the lower surface of the cylindrical portion 9a. The case portion 9b has a lower end formed into an inclined surface that slopes downward at a constant angle from the tip end toward the rear end side, the rear end surface is open, and the front end side is bored into the cylindrical portion 9a. It is communicated with the inside of the cylindrical portion 9a through the through hole 15.

Further, inside the cylindrical portion 9a, a lubricant supply hose 7 connected to the rear end of a lubricant discharge nozzle 8 fixed to a nozzle fixing fitting 10 is arranged so as to be separated from the main body 3 of the electrostatic lubricator T. It is arranged along the inner wall of the cylindrical portion 9a. On the other hand, a resistor 1 connected to the nozzle fixing fitting 10 is provided inside the case portion 9b.
4 is fixed along the inclined surface formed at the lower end of the case portion 9b. As a result, a discharge action occurs between the main body 3 and lubricant supply hose 7 of the electrostatic oil applicator T housed in the cylindrical part 9a and the resistor 14 and its conductor housed in the case part 9b. Sufficient insulation distance is ensured to prevent this.

Further, on the rotation shaft 5 of the air motor 4, a circular shape is provided between the cup-shaped body 6 and the main body 3, and is located slightly inside the distal end edge of the cylindrical part 9a of the cover 9, and covers the distal end of the main body 3. Rotating plate 1
6 is installed.

The gap between the circumferential edge of the rotary plate 16 and the inner circumferential surface of the cylindrical portion 9a is selected to be, for example, about 7 to 1Q nm, so that the rotation of the rotary plate 16 causes the circumferential edge of the rotary plate 16 to close to the cover. A negative pressure state is created between the inner circumferential surface of the cylindrical part 9a of 9, and droplets of lubricant formed on the tip edge of the cylindrical part 9a are sucked into the cylindrical part 9a together with air. It is made possible.

Further, the lubricant discharge nozzle 8 extending from the inside of the cylindrical part 9a toward the inside of the cup-shaped body 6 is arranged between the peripheral edge of the rotary plate 16 and the peripheral wall of the cup-shaped body 6. The distance between the discharge port 8a and the inner surface of the cup-shaped body 6 (for example, 2 to 3
It is bent into a predetermined shape that can maintain a larger spacing (for example, 4 to 5 dragons or more).

Further, the main body 3 of the electrostatic oil application aT is disposed horizontally with its rear end fixed to an insulating support member 17.

Thus, a high voltage of about C,(-)80 Kv is applied from the high voltage generator 1 to the cup-shaped body 6 via the high voltage cable 2, and it is driven by high pressure air supplied from the air hose 18. The cup-shaped body 6 is driven to rotate at a high speed of about 20,000 to 50.00 rpm by an air motor 4.

Then, the metal plate K to be coated is continuously conveyed at a predetermined speed, and the lubricant supplied through the lubricant supply hose 7 is continuously atomized from the discharge port 8a of the lubricant discharge nozzle 8. and discharge it in the form of particles.

At this time, there is a voltage of approximately 4 KV between the discharge port 8a of the lubricant discharge nozzle 8 to which a high voltage of approximately ()76 Kv is applied and the inner surface of the cup-shaped body 6 to which a high voltage of (-)80 Kv is applied. Since an electric field is created by generating a potential difference of It is adsorbed.

Therefore, the lubricant particles discharged from the discharge port 8a of the lubricant discharge nozzle 8 are not bounced back by the centrifugal force of the cup-shaped body 6, but are efficiently adhered to the cup-shaped body 6 and are reliably supplied in a fixed amount. The Rukoto.

Further, even if the potential difference between the cup-shaped body 6 and the lubricant discharge nozzle 8 is about 4 KV, the current value is about 0.015 A.
Since it is extremely small at about X 10-3, there is no risk of the lubricant catching fire due to spark discharge.

According to the embodiment, the fixed position of the lubricant discharge nozzle 8 can be adjusted by the set screw 12 of the nozzle fixing fitting 10 depending on the resistance values of the resistors 13 and 14 used, the voltage value applied to the cup-shaped body 6, etc. By adjusting and delicately changing the distance between the discharge port 8a and the inner surface of the cup-shaped body 6, the strength of the electric field between the discharge port 8a of the lubricant discharge nozzle 8 and the inner surface of the cup-shaped body 6 can be optimized. You can fine-tune it to suit.

Further, the main body 3 of the electrostatic oil applicator T and the lubricant supply hose 7 are arranged in the cylindrical part 9a of the cover 9, and the resistor 14 connected to the ground and its conductor are separated by the lower surface of the cylindrical part 9a. Since it is arranged along the lower end side inclined surface in the case part 9b, it is possible to prevent a voltage drop from being caused by discharge from the main body 3 of the electrostatic oil applicator T and the lubricant supply hose 7 to the conductor wire of the resistor 14. be done.

Therefore, the lubricant is discharged from the outlet 8a of the lubricant discharge nozzle 8.
It is possible to supply a constant quantity of lubricant to the cup-shaped body 6 without interruption, and at the same time, the degree of atomization of the lubricant particles electrostatically atomized from the cup-shaped body 6 can be maintained extremely well.

Also, the nozzle fixing fitting 10. The resistor 13 and the resistor 14 are
Since all of them are housed in the cover 9, the lubricant particles electrostatically atomized from the cup-shaped body 6 adhere to their surfaces to form lubricant droplets, and the droplets are exposed to high voltage. This action also prevents large lubricant particles from flying out.

Further, the lubricant adhering to the surface of the cover 90 flows down from the cylindrical part 9a to the case part 9b, and travels along the slope formed at the lower end of the case part 9b to the rear end side of the electrostatic lubricator T. , the droplets of the lubricant adhering to the surface of the cover 9 fly out toward the surface of the metal plate due to the action of the electric field formed between the tip of the electrostatic lubricator T and the metal plate. This will be prevented.

Furthermore, the tip side of the cylindrical portion 9a of the cover 9 is provided with a rotary plate 16.
Since the rotation of the cover 9 creates a negative pressure state and air is sucked in, droplets of lubricant adhering to the tip edge of the cylindrical portion 9a of the cover 9 are sucked into the cylindrical portion 9a.
This prevents it from flying out in the direction of the metal plate.

Therefore, it is possible to reliably prevent large lubricant particles from adhering to the surface of the metal plate and causing oil spots.

Furthermore, both the cylindrical part 9a and the case part 9b of the cover 9 are open at their rear ends, and the air sucked into the cylindrical part 9a through the opening at its tip by the rotation of the rotary plate I6 is drawn into the rear end. The air sucked into the cylindrical part 9a flows into the case part 9b through the through hole 15 and flows out to the rear end. a resistor 13 disposed within the case portion 9b, and a resistor 14 disposed within the case portion 9b.
is cooled and its heat generation is suppressed.

Therefore, deterioration of the resistors 13 and 14 due to overheating, occurrence of fire, etc. can be prevented.

In the above embodiments, the case where the lubricant is discharged in the form of particles from the discharge port 8a of the lubricant discharge nozzle 8 has been described, but the same effect can be obtained when the lubricant is discharged in the form of droplets. It will be done.

[Effects of the Invention] As described above, according to the present invention, particles or droplets of the lubricant discharged from the lubricant discharge nozzle are adsorbed into the cup-shaped body by the ion movement action of the electric field, so that the lubricant Even when a very small amount of lubricant is continuously atomized and discharged from the discharge nozzle, the lubricant particles are not bounced off by the cup-shaped body that rotates at high speed, and are efficiently quantified into the cup-shaped body. This has the excellent effect of reliably preventing the occurrence of uneven oil application.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an electrostatic oil applicator according to the present invention;
FIG. 2 is a rear view of a cover that houses the electrostatic oil applicator, and FIG. 3 is a side view of a conventional electrostatic oil applicator. Description of symbols T--Electrostatic oil applicator, 1--High voltage generator, 2--High voltage cable, 3- Main body of electrostatic oil applicator, 4- Air motor, 5- Rotating shaft, 6- Cup-shaped body, 7--lubricant supply hose, 8--lubricant discharge nozzle, 8a-discharge port, 13.
14.-Resistance. Patent applicant Trinity Kogyo Co., Ltd. Toyo Kohan Co., Ltd.

Claims (1)

[Claims] In an electrostatic oil applicator that supplies a certain amount of lubricant from a lubricant discharge nozzle into a cup-shaped body to which a high voltage is applied and is driven to rotate at high speed and electrostatically atomizes it, the lubricant discharge nozzle is made of a conductive material. Particles of lubricant that are formed and provided insulated and separated from the main body of an electrostatic lubricant applicator, and are discharged from the lubricant discharge nozzle by creating a certain potential difference between the lubricant discharge nozzle and the cup-shaped body. Alternatively, an electrostatic oil applicator is characterized in that it is configured to create an electric field that attracts droplets to a cup-shaped body.