JPS614557A - Electrostatic oil coating device - Google Patents

Abstract

PURPOSE:To improve the quality of an oil film on a material to be coated by interposing a cup-shaped rotary member which is fixed to the revolving shaft and is rotated at high speed between the spray nozzle of a coating oil agent supply pipe and the inner surface of the cup-shaped body. CONSTITUTION:A coating oil agent, which is continuously discharged as coarse particles under liquid or air pressure from an atomization nozzle 10 of a coating oil agent supply pipe 9, is made into extremely fine particles by a rotary plate 12 which revolves at the same high speed as a cup-shaped body 4. The fine particles are emitted through a slit 15, supplied uniformly and continuously over the whole region of the inner peripheral surface of the outer cylinder 5 of the cup-shaped body 4, and supplied as a uniform thin film by centrifugal force through a slit 8 over the whole region of the whole periphery of the leading end part of the outer cylinder 5. Then the film is electrostatically atomized at said leading end part, and emitted to a material to be coated.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention supplies a lubricating agent into a cup-shaped body that is driven to rotate at high speed by a rotary drive source such as an air motor and applies a high voltage, and This invention relates to an electrostatic oil applicator that atomizes and emits atomized particles using centrifugal force and electrostatic force.

[Prior art and its problems]

This type of electrostatic oil applicator is mainly used to form a thin oil film on the surface of a strip-shaped plate such as a steel plate, an aluminum plate, or a copper plate. 1. For the purpose of improving machinability or preventing scratches during transportation, the surface is coated with oil particles.

By the way, when performing this type of oiling treatment, it is necessary to take into consideration the reduction of burden when performing secondary processing of the product after the oiling treatment, such as degreasing the oiled object, so that it can be applied evenly with a very small amount of oil. It is desirable to form a thin film that is In particular, when applying oil to the surface of a strip steel plate for purposes such as rust prevention in the final forming process, the amount of lubricant supplied to the cup-shaped body of the electrostatic oil applicator should be controlled at lcc/min. It is required to form an extremely thin oil film at a certain level.

However, in conventional electrostatic lubricating devices, when the amount of lubricant supplied is relatively large, a fixed amount of lubricant is always continuously supplied from the lubricant supply pipe into the cup-shaped body, and the oil to be coated is constantly supplied from the lubricant supply pipe into the cup-shaped body. It is possible to uniformly apply oil to the surface of the object, but the supply amount is about 15c.
c/min or less, lubricant droplets are once formed at the tip of the lubricant supply pipe, and once they reach a certain amount, the phenomenon of dropping one drop at a time is repeated, causing an intermittent dripping phenomenon. It is said that the force cannot be continuously supplied to the knob-shaped body, and as a result, lubricant particles are intermittently emitted from the cup-shaped body, causing a so-called breathing phenomenon in the lubricating state and causing uneven lubricating. It had serious drawbacks.

In particular, if the lubricant supply rate in the final process of steel strip strips is approximately lcc/min as described above, the time interval between each drop of lubricant being dripped and supplied from the lubricant supply pipe into the cup-shaped body is approximately 10 seconds. However, in this case, since the strip steel plate was conveyed at a high speed of about 1,500/min, it was completely impossible to form a uniform thin film on the surface of the steel plate.

Therefore, the present applicant filed Japanese Patent Application No. 58-19143,
By disposing an atomizing nozzle in the lubricant discharge hole of the lubricant supply pipe and supplying the lubricant in an atomized state from the spout of the atomizing nozzle to the cup-shaped body, the lubricant can be supplied in a small amount. We have proposed an electrostatic oil application device that does not cause the breathing phenomenon as described above even when

However, the inventors have made this improvement.
) Further experimental research was conducted on the electrostatic oil applicator, and although the obvious breathing phenomenon was resolved, the lubricant ejected from the atomizing nozzle's spout nozzle was unable to absorb the inner periphery of the rotating cup-shaped body. Since the lubricant is supplied locally to the surface and cannot be uniformly supplied over the entire inner circumference at the same time, the lubricant is uniformly distributed over the entire circumference of the tip of the cup-shaped body that electrostatically atomizes the lubricant. It has been found that there is a problem in that it cannot be supplied in the form of a film and that perfect /[I] film quality cannot yet be obtained.

[Purpose of the invention]

Therefore, in the present invention, the lubricant continuously discharged from the atomizing nozzle of the lubricant supply pipe is made into finer and more uniform particles by centrifugal force, and is uniformly supplied over the entire circumference of the rotating inner surface of the cup-shaped body. It is an object of the present invention to provide an electrostatic oil applicator capable of forming a high-quality thin film with significantly better uniformity than before on the surface of an object to be oiled.

[Structure of the invention]

In order to achieve this object, the present invention supplies a lubricant from a lubricant supply pipe to a cup-shaped body that is fixed to the tip of a rotating shaft of a rotary drive source, is driven to rotate at high speed, and is applied with a high voltage. In an electrostatic oil applicator configured to electrostatically atomize, an atomizing nozzle is disposed at the tip of the lubricant supply pipe, and the rotating oil is disposed between the atomizing nozzle and the inner surface of the cup-shaped body. A rotating member fixed to the shaft is interposed, and the rotating member is configured to atomize the lubricant discharged from the atomizing nozzle by centrifugal force and supply it to the inner surface of the cup-shaped body. Features.

[Example　■]

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view showing an example of an electrostatic oil applicator according to the present invention.

In the figure, the reference numeral ``■'' denotes a main body housing an air motor 2 as a rotational drive source, and a rotary shaft 3 of the air motor 2 is extended forward and has a cup-shaped body 4 fixed to its tip.

The cup-shaped body 4 is integrally formed with a so-called cup-shaped outer cylinder 5, a partition wall 6 that closes the center portion in the axial direction, and the center portion of the partition wall 6, and its shape gradually becomes larger toward the partition wall 6 side. It is composed of a truncated conical inner cylinder 7, a partition wall 6 and an outer cylinder 5.
A small hole or slit 8 is formed at a required interval between the
80-12! A high voltage of about OKV is applied.

Reference numeral 9 denotes a lubricant supplying vibrator which protrudes and extends from the front end of the main body l toward the inside of the cup-shaped body 4 and has an atomizing nozzle 10 disposed at its tip; The lubricant is discharged from the outlet 1) in the form of particles.

12 is a rotating member fixed to the rotating shaft 3 and interposed between the atomizing nozzle 10 of the lubricant supply pipe 9 and the partition wall 6 and inner 'wi7 of the cup-shaped body 4, and is perpendicular to the rotating shaft 3. a circular plate 13 extending in the horizontal direction; and a truncated conical folded piece projecting from the periphery of the circular plate 13 toward the rear end of the cup-shaped body 4 and tilting at a required angle in the direction of the rotation axis 3. 1
4, and a plurality of small holes or slits 15 are formed at required intervals on the periphery of the circular plate body 13.

Note that the outer diameter of the rotating member 12 is selected to be smaller than the inner diameter of the opening 16 formed in the rear end surface of the cup-shaped body 4.

The above is an example of the configuration of the electrostatic oil applicator according to the present invention, and its operation will be explained next.

First, the air motor 2 is driven and the cup-shaped body 4 fixed to the tip of the rotating shaft 3 is moved about 20 minutes. OOOrpm~50
,00Orpm, and DC-80
A high voltage of about 120 KV is applied.

In this state, a lubricant such as rust preventive oil is supplied from a lubricant supply source (not shown) to the lubricant supply pipe 9, and the supply vibrator 9
It is ejected in the form of particles from the spout 1) of the atomizing nozzle 10 attached to the tip of the atomizing nozzle 10.

The released lubricant particles are supplied onto the circular plate 13 of the rotary plate 12 which is fixed to the rotating shaft 3 and rotated at the same speed as the cup-shaped body 4, and the circular plate 13 is rotated by centrifugal force. The particles are emitted as very fine and uniform particles through the slit 15 formed on the periphery of the cup-shaped body 4.
The water is supplied extremely uniformly and continuously over the entire circumference of the outer cylinder 5). Furthermore, the lubricating agent that has been uniformly supplied over the entire circumference of the rotating inner surface of the cup-shaped body 4 is supplied as a uniform thin film over the entire circumference of the tip of the outer cylinder 5 through the slit 8 due to centrifugal force. Here, it is electrostatically atomized and radiated onto the object to be oiled, and the surface of the object to be oiled is electrostatically coated with oil.

As described above, according to the above embodiment, the lubricating agent that is continuously discharged as coarse particles from the atomizing nozzle 10 of the lubricating agent supply pipe 9 by hydraulic or air pressure is delivered at the same speed as the cup-shaped body 4. The oil is made into extremely fine particles by the rotating plate 12 that rotates at high speed, and is uniformly and continuously supplied over the entire rotating inner surface of the cup-shaped body 4, which not only prevents the phenomenon of breathing and uneven oil application. Since the lubricant can be supplied in the form of an extremely uniform thin film over the entire circumference of the tip of the cup-shaped body 4 that electrostatically atomizes the lubricant, the lubricant can be applied to the surface of the object to be coated in an unprecedentedly uniform manner. It is possible to form high-quality thin films with good properties.

Furthermore, if the outer diameter of the rotating member 12 is selected to be smaller than the inner diameter of the opening 16 formed on the rear wheel surface of the cup-shaped body 4 as in the embodiment, when replacing the cup-shaped body 4, the rotating member 12 12 can be attached and detached while being fixed to the rotating shaft 3, and on the other hand, the rotating member 12 can also be easily replaced at any time depending on the lubricant supply source and the diameter of the cup-shaped body 4 to select the most suitable one. There are advantages to getting it.

[Example　■]

Next, FIG. 2 is a longitudinal sectional view showing another example of the electrostatic oil applicator according to the present invention.

Parts common to those in FIG. 1 are given the same reference numerals and detailed explanation thereof is omitted;
is integrally projected from the circumferential edge of the circular plate body 13'' toward the rear end side of the cup-shaped body 4, and is angled toward the outer cylinder 5 of the cup-shaped body 4 at a required angle (IJ! The folded piece 14' has a truncated conical shape, and thin strips 417 are carved at predetermined intervals along the inner peripheral surface of the tip of the folded piece 14. The outer diameter of the cup-shaped body 12 is selected to be smaller than the inner diameter of the opening 16 of the cup-shaped body 4, so that only the rotating member 12 and the cup-shaped body 4 can be replaced.

As a result, the lubricant supplied onto the circular plate 13'' of the rotary plate 12 is moved from the periphery of the cough plate 13' to the folded piece 14 by centrifugal force.
Transfers to the inner circumferential surface of ゛, forms a uniform thin film over its entire circumference, and is emitted as extremely fine and uniform particles from the periphery of the tip of the folded piece 14° in which the thin groove 17 is carved. It is supplied extremely uniformly and continuously to the inner peripheral surface of the outer cylinder 5 of the cup-shaped body 4 over its entire circumference.

Therefore, in this example as well, the same effects as in the first example can be obtained.

[Operation and effect of the invention]

As described above, according to the present invention, a rotating member that is fixed to a rotating shaft that rotationally drives the cup-shaped body and rotated at high speed is provided between the atomization nozzle of the lubricant supply pipe and the inner surface of the cup-shaped body. The rotating member interposes the lubricating agent released in the form of particles from the atomizing nozzle by air pressure or hydraulic pressure into more uniform and fine particles by centrifugal force, and then converts the lubricating agent into more uniform and fine particles through the rotating inner surface of the cup-shaped body. Since the lubricating agent is configured to be uniformly and continuously supplied over the entire circumference of the cup-shaped body, the lubricating agent is continuously supplied as an extremely uniform thin film over the entire circumference of the tip of the cup-shaped body, and therefore It has the excellent effect of significantly improving oil film quality compared to conventional methods.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal cross-sectional views showing an example of an electrostatic oil applicator according to the present invention, respectively. Explanation of symbols 2-Air morph (rotary drive source), 3-Rotating shaft, 4-Cup-shaped body, 9-Lubricant supply vibe, 10-Atomization nozzle, 1
) - spout, 12 - one rotation member, 13.13° - circular plate, 14.14' - folded piece, 15 - slit, 17 - thin groove. Patent applicant: Trinity Industries Co., Ltd. Figure 1 Figure 2

Claims (3)

[Claims] (1) A lubricant is supplied from a lubricant supply pipe to a cup-shaped body fixed to the tip of a rotating shaft of a rotation drive source, driven to rotate at high speed, and to which a high voltage is applied, and electrostatically atomized. In the electrostatic oil applicator, an atomizing nozzle is disposed at the tip of the lubricant supply pipe, and a rotating member fixed to the rotating shaft is interposed between the atomizing nozzle and the inner surface of the cup-shaped body. An electrostatic lubricating device, characterized in that the rotary member is configured to atomize the lubricating agent discharged from the atomizing nozzle by centrifugal force and supply the atomized lubricating agent to the inner surface of the cup-shaped body. (2) The rotating member is composed of a circular plate and a truncated conical folded piece that protrudes from the periphery of the plate toward the rear end of the cup-shaped body and is inclined at a required angle in the direction of the rotation axis. ,
The electrostatic oil applicator according to claim 1, wherein slits or perforations are formed at required intervals along the circumferential edge of the circular plate or the circumferential surface of the folded piece. (3) The rotating member includes a circular plate body and a truncated cone-shaped folded piece that protrudes from the periphery of the plate body toward the rear end side of the cup-shaped body and is inclined at a predetermined angle in the direction of the outer cylinder of the cup-shaped body. An electrostatic oil applicator according to claim 1, comprising the following.