JPH0116545B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention supplies a lubricant into a cup-shaped body that is driven to rotate at high speed by a rotary drive source such as an air motor and to which a high voltage is applied. The present invention relates to an electrostatic oil application device that atomizes and emits oil 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. 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 oil film. In particular, when applying oil to the surface of the steel strip for purposes such as rust prevention in the final process of forming the steel sheet, the amount of lubricant supplied to the cup-shaped body of the electrostatic oil applicator should be 1 c.c./c. It is required to form an extremely thin oil film at a thickness of about 100 min.

However, in the case of conventional electrostatic lubricating equipment, 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 supplied. It is possible to uniformly apply oil to the surface of the object, but if the supply rate is less than about 15 c.c./min, droplets of lubricant will form 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, and the lubricant cannot be continuously supplied to the cup-shaped body, so that the lubricant particles are intermittently emitted from the cup-shaped body. This has a serious drawback in that a so-called breathing phenomenon occurs in the oil application state, resulting in uneven oil application.

In particular, if the lubricant supply rate in the final process of strip steel plate is approximately 1 c.c./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 c.c./min. In this case, since the strip steel plate was being conveyed at a high speed of about 1500/min, it was completely impossible to form a uniform oil 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 to the cup-shaped body from the spout of the atomizing nozzle,
We have proposed an electrostatic oil applicator that does not cause the above-mentioned breathing phenomenon even when the amount of lubricant supplied is small.

However, when the present inventors conducted further experimental research on the electrostatic oil applicator improved in this way, although the obvious breathing phenomenon was resolved, the amount of water emitted from the atomizing nozzle nozzle was The lubricant is supplied locally to the inner peripheral surface of the rotating cup-shaped body, and cannot be uniformly supplied over the entire inner circumference at the same time. It has been found that there is a problem in that it is not possible to supply the lubricating agent in a uniform thin oil film over the entire circumference of the tip, and it is still not possible to obtain a perfect oil film quality.

[Purpose of the invention]

Therefore, the present invention aims to use centrifugal force to turn the lubricating agent continuously discharged from the atomizing nozzle of the lubricating agent supply pipe into finer and more uniform particles 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 oil film with significantly better uniformity than before on the surface of an object to be oiled by supplying an oil film.

[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 which is fixed to the tip of a rotating shaft of a rotary drive source, is driven to rotate at high speed, and to which a high voltage is applied. 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 lubricating agent discharged from the atomizing nozzle by centrifugal force and supply it to the inner surface of the cup-shaped body. Features.

[Example] The present invention will be described below based on specific examples 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, reference numeral 1 denotes a main body with a built-in air motor 2 as a rotational drive source, and a rotation shaft 3 of the air motor 2.
extends forward and has a cup-shaped body 4 fixed to its tip.

The cup-shaped body 4 includes a so-called cup-shaped outer cylinder 5, a partition wall 6 that closes the central part in the axial direction, and the partition wall 6.
It consists of a frusto-conical inner cylinder 7 which is integrally molded in the center of the partition wall 6 and whose shape gradually becomes larger toward the partition wall 6, and a small hole is formed between the partition wall 6 and the outer cylinder 5 at a required interval. Or, while the slit 8 is formed,
Although not shown, DC-80 ~ from a high voltage generator
A high voltage of about 120KV is applied.

Reference numeral 9 denotes a lubricant supply pipe that projects and extends from the front end of the main body 1 toward the inside of the cup-shaped body 4 and has an atomizing nozzle 10 disposed at its tip, and a spout port disposed at the lower end of the atomizing nozzle 10. From 11, the lubricant is released 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 cylinder 7 of the cup-shaped body 4;
A circular plate 13 extending in the horizontal direction orthogonal to the rotation axis 3, and a truncated cone protruding from the periphery of the circular plate 13 toward the rear end of the cup-shaped body 4 and tilted at a required angle in the direction of the rotation axis 3. 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 its rotating shaft 3 is
The cup-shaped body 4 fixed to the tip of the
~50000rpm high speed rotation drive and DC-80
Apply a high voltage of ~120KV.

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,
It is discharged in the form of particles from the spout 11 of the atomizing nozzle 10 attached to the tip of the supply pipe 9.

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 extremely fine and uniform particles through the slit 15 formed on the periphery of the cup-shaped body 4, and are extremely uniform and continuous over the entire circumference of the inner peripheral surface of the outer cylinder 5 of the cup-shaped body 4. Supplied. Furthermore, the lubricating agent, which has been uniformly supplied over the entire circumference of the rotating inner surface of the cup-shaped body 4, passes through the slit 8 due to centrifugal force and forms a uniform thin film over the entire circumference of the tip of the outer cylinder 5. Here, the oil 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 released in the form of coarse particles from the atomizing nozzle 10 of the lubricant 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, so that there is no chance of lubrication and uneven oil application. In addition, since the lubricant can be supplied in the form of an extremely uniform thin oil film over the entire circumference of the tip of the cup-shaped body 4 that electrostatically atomizes the lubricant, it is possible to apply the lubricant to the surface of the object to be oiled, unlike conventional methods. It is possible to form a high quality thin oil film with extremely good uniformity.

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 end surface of the cup-shaped body 4 as in the embodiment, when replacing the cup-shaped body 4, the rotating member 12 can be attached and detached while fixed to the rotating shaft 3, and on the other hand,
The rotary member 12 also has the advantage that it can be easily replaced at the appropriate time depending on the supply amount of lubricant and the diameter of the cup-shaped body 4 to select the most suitable one.

[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 a detailed explanation thereof is omitted. It is composed of a truncated cone-shaped folded piece 14' that integrally projects from the rear end side of the body 4 and is inclined at a predetermined angle in the direction of the outer cylinder 5 of the cup-shaped body 4, and the tip of the folded piece 14' Narrow grooves 17 are cut at predetermined intervals along the inner peripheral surface of the portion. In the case of this example as well, the outer diameter of the rotating member 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.

The lubricant supplied onto the circular plate 13' of the rotary plate 12 is transferred from the periphery of the plate 13' to the inner peripheral surface of the folded piece 14' by centrifugal force, and is uniformly distributed over the entire circumference. The particles form a very thin film and are emitted as very fine and uniform particles from the periphery of the tip of the folded piece 14' in which the thin groove 17 is carved, and are emitted onto the inner circumferential surface of the outer cylinder 5 of the cup-shaped body 4. However, it is supplied extremely uniformly and continuously 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, there is provided a rotating member fixed to a rotating shaft for rotationally driving the cup-shaped body and rotated at high speed between the atomizing nozzle of the lubricant supply pipe and the inner surface of the cup-shaped body. The rotary member interposed therebetween transforms the lubricant released in particle form 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 around the entire circumference of 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 in an extremely uniform thin oil film over the entire circumference of the tip of the cup-shaped body, and therefore the oil to be coated is It has the excellent effect of significantly improving the oil film quality of objects compared to conventional methods.

[Brief explanation of drawings]

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 the code, 2... Air motor (rotary drive source),
3... Rotating shaft, 4... Cup-shaped body, 9... Lubricant supply pipe, 10... Atomizing nozzle, 11... Spout nozzle, 12... Rotating member, 13, 13'... Circular plate body, 14, 14'...Folded piece, 15...Slit,
17...Narrow groove.

Claims (1)

[Scope of 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 configured as above, an atomizing nozzle is disposed at the tip of the lubricant supply pipe, and the atomizing nozzle is fixed to the rotating shaft between the atomizing nozzle and the inner surface of the cup-shaped body. A rotating member 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. Oiling device. 2. The rotating member is composed of a circular plate and a truncated cone-shaped folded piece that protrudes from the periphery of the plate toward the rear end of the cup-shaped body and is inclined at a predetermined angle in the direction of the rotation axis, and 2. 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 and a truncated cone-shaped folded piece that protrudes from the periphery of the plate toward the rear end 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, wherein the electrostatic oil applicator is constructed as follows.