JPH0116544B2 - - 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. In the final molding process, the surface is coated with oil particles for the purpose of preventing rust, improving machinability, or preventing scratches during transportation.

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.

Furthermore, since the conventional electrostatic oil applicator supplies the lubricant from the lubricant supply pipe to the cup-shaped body in the form of a liquid stream or droplets, the apparatus is used to apply the lubricant to the object to be oiled, such as a steel strip. On the other hand, if you try to apply oil while it is installed upwards from below, there is also the drawback that the lubricant supplied to the cup-shaped body overflows to the bottom, making it impossible to perform good oil application. Was.

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 lubricating device that does not cause the above-mentioned breathing phenomenon even when the amount of lubricant supplied is small, and can perform good lubricating work regardless of the installation orientation of the device.

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 locally supplied to the inner circumferential surface of the rotating cup-shaped body and cannot be uniformly supplied over the entire circumference, and the lubricant particles discharged from the atomizing nozzle are Since the particles are very coarse compared to the lubricant particles that are atomized and released from the tip of the shaped body by centrifugal force and electrostatic force, there is a problem that it is still not possible to obtain a perfect oil film quality. found.

[Purpose of the invention]

Therefore, the present invention provides that the lubricant discharged from the atomizing nozzle of the lubricant supply pipe is not directly supplied to the cup-shaped body, but is supplied to the inner circumferential surface of the rotating shaft formed of a hollow pipe. By applying centrifugal force to the tip of the rotating shaft that rotates at the same speed as the oil, the oil film quality is even better than before. The purpose is to obtain.

[Structure of the invention]

In order to achieve this object, the present invention includes a main body incorporating a rotary drive source, and a rotary drive source that is fixed to the tip of a rotating shaft of the rotary drive source that protrudes forward from the main body, and is driven to rotate at high speed and at high speed. In an electrostatic oil applicator comprising a cup-shaped body to which a voltage is applied and a lubricant supply pipe for supplying lubricant into the cup-shaped body, the rotary shaft is a hollow pipe having an inclined surface on the inner periphery of the tip thereof. The lubricant supply pipe, which is formed at the same time and has an atomizing nozzle attached to its tip, is inserted into the rotating shaft substantially coaxially with the inner peripheral surface of the rotating shaft at a distance from the inner circumferential surface of the rotating shaft, and the atomizing nozzle has an ejection port is arranged so as to face the inclined surface.

〔Example〕

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

The figure 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.
is extended forward and has a cup-shaped body 4 at its tip.
is fixed.

The rotating shaft 3 is formed entirely of a hollow pipe, and the tip thereof is formed so that its inner diameter gradually increases as it approaches the tip, and a truncated conical inclined surface 5 is formed on the inner periphery of the tip. It is formed.

Inside the rotating shaft 3 thus formed, a lubricant supply pipe 6 is provided spaced apart from and substantially coaxially with the inner peripheral surface of the rotating shaft 3.
is inserted therethrough, and a spout 8 of an atomizing nozzle 7 attached to the tip of the lubricant supply pipe 6 is disposed so as to face the inclined surface 5 of the rotating shaft 3.

The cup-shaped body 4 includes a so-called cup-shaped outer cylinder 9, a partition wall 10 that closes the axial center of the outer cylinder 9, and a partition wall 10 that is integrally formed along the periphery of the partition wall 10. The inner cylinder 12 is formed to have a small inner diameter and has a truncated conical inclined surface 11 formed on the inner periphery, and small holes or slits 13 are provided at required intervals between the partition wall 10 and the outer cylinder 9. is formed, and although not shown, a high voltage generator
A high voltage of DC -80 to 120KV is applied.

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 built into the main body 1 is driven to rotate the cup-shaped body 4 fixed to the tip of the rotating shaft 3 at high speed, and a high voltage is applied.
A lubricant is supplied from a lubricant supply source (not shown) to a lubricant supply pipe 6 inserted into the rotating shaft 3 .

The supplied lubricant is emitted in the form of particles from the spout 8 of the atomizing nozzle 7 attached to the tip of the lubricant supply pipe 6, and is continuously emitted onto the inclined surface 5 of the rotating shaft 3 facing the spout 8. be supplied.

The lubricant supplied to the inclined surface 5 of the rotating shaft 3 rotating at high speed is emitted from the tip edge of the rotating shaft 3 as extremely uniform and very fine particles due to centrifugal force, and is emitted from the inside of the cup-shaped body 4. It is continuously and uniformly supplied to the inclined surface 11 of the cylinder 12 over the entire circumference.

In this way, the lubricating agent supplied to the cup-shaped body 4 in the form of extremely fine particles becomes a uniform thin film due to centrifugal force, and passes from the inclined surface 11 of the inner cylinder 12 through the slit 13 into the outer cylinder 9. move to the peripheral surface,
It is electrostatically atomized from its front end and radiated onto the object to be coated with electrostatic oil.

As described above, the electrostatic oil applicator according to the present invention has the following features:
Coarse particles of the lubricant continuously emitted from the atomizing nozzle 7 of the lubricant supply pipe 6 are supplied to the inclined surface 5 of the rotating shaft 3 that rotates at high speed, and are converted into extremely fine particles from the tip edge of the rotating shaft 3. Since the lubricant is distributed evenly over the entire circumference of the inclined surface 11 in the cup-shaped body 4, even when the amount of lubricant applied is extremely small, the lubricant is applied to the tip of the cup-shaped body 4. It is possible to continuously supply oil in an extremely uniform thin film over the entire circumference, and therefore the object to be oiled can be coated with a more uniform film thickness than conventional devices.

In addition, when the end face of the cup-shaped body 4 on the main body 1 side is completely closed as shown in the figure, the lubricant particles emitted from the tip of the rotating shaft 3 are prevented from scattering on the main body 1 side, Therefore, even when the device of the present invention is installed from above on the object to be oiled, the scattered particles of the lubricant adhere to the front end surface of the main body 1, reach a certain amount, and turn into droplets to remove the oil to be applied. When dripped directly onto an object, there is no possibility that a thick oil film called an oil spot will form on the surface of the object, resulting in poor lubrication.

[Operation and effect of the invention]

As described above, according to the present invention, a lubricating agent supply pipe having an atomizing nozzle is inserted into the rotary shaft formed of a hollow pipe and having an inclined surface formed on the inner periphery of the tip thereof, and the lubricating agent is supplied. First, the atomized state is continuously supplied from the spout of the atomizing nozzle to the inclined surface of the rotating shaft that is driven to rotate at high speed, and then from the tip of the rotating shaft, it becomes even finer particles by centrifugal force and is then capped. Since the lubricant is uniformly supplied over the entire circumference of the rotating inner surface of the body, the lubricating agent is not only electrostatically atomized continuously without interruption, but also does not cause the breathing phenomenon. It has the excellent effect of forming a more uniform oil film on the surface of the object to be oiled.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an example of an electrostatic oil applicator according to the present invention. Description of symbols, 1... Main body, 2... Air motor (rotary drive source), 3... Rotating shaft, 4... Cup-shaped body, 5... Inclined surface, 6... Oil supply pipe, 7
... Atomization nozzle, 8 ... Spout nozzle.

Claims (1)

[Scope of Claims] 1. A main body with a built-in rotary drive source, and a rotary drive source that is fixed to the tip of a rotating shaft of the rotary drive source that protrudes forward from the main body to be driven to rotate at high speed and to which a high voltage is applied. In an electrostatic oil applicator comprising a cup-shaped body and a lubricant supply pipe for supplying a lubricant into the cup-shaped body, the rotating shaft is formed of a hollow pipe having an inclined surface on the inner periphery of its tip, and
The lubricant supply pipe with an atomizing nozzle attached to its tip is inserted into the rotating shaft substantially coaxially with the inner circumferential surface of the rotating shaft, and the ejection port of the atomizing nozzle is arranged on the inclined surface. An electrostatic oil application device characterized by being arranged so as to face each other. 2. The electrostatic oil application device according to claim 1, wherein the end face of the cup-shaped body on the side of the main body is closed.