JPH0137716Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention supplies a lubricant to a cup-shaped body that is driven to rotate at high speed and to which a high voltage is applied, and this lubricant is applied by centrifugal force and electrostatic force. This invention relates to an improvement in an electrostatic oil applicator that atomizes and radiates oil.

Conventionally, this type of electrostatic oil applicator was mainly used for steel plates,
It is used to form a thin oil film on the surface of a strip-shaped plate such as an aluminum plate or a copper plate, for example, in the final process of forming the strip-shaped plate, to prevent rust, improve machinability, or prevent scratches during transportation. For this purpose, oily particles are applied to the surface to form a thin oil film.

By the way, when performing such oil coating, it is necessary to create a uniform thin oil film with a very small amount of oil, in order to reduce the burden on secondary processing of the oiled product, such as degreasing. It is desirable to form a In particular, when forming a thin oil film on the surface of a steel strip for rust prevention purposes in the final process of forming the steel strip, the amount of lubricant supplied to the cup-shaped body of the electrostatic oil applicator should be approximately 1 cc/min. It is required to form an extremely thin oil film.

[Conventional technology]

However, in the case of conventional electrostatic lubricating equipment, when the amount of lubricant supplied is relatively large, a certain amount of lubricant is 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 cc/min, droplets of lubricant will form at the tip of the lubricant supply pipe, and once they reach a certain amount, they will drip out one drop at a time. This phenomenon is repeated, resulting in a so-called intermittent dripping phenomenon, and as a result, the lubricant cannot be continuously supplied from the lubricant supply pipe to the cup-shaped body, and as a result, lubricant particles drop from the cup-shaped body. This has a serious drawback in that the oil is emitted intermittently, causing a so-called breathing phenomenon in the oil application state, resulting in uneven oil application.

In particular, if the lubricant supply rate is about 1 cc/min in the final process of forming a steel strip as mentioned above, the interval between drops of lubricant dripping from the lubricant supply pipe into the cup-shaped body will be about 10 seconds. In this case, since the steel strip is being conveyed at a high speed of about 1500 m/min, it is completely impossible to form a uniform thin oil film on the surface of the steel strip, and conventional electrostatic oil coating equipment cannot could not be applied at all.

In addition, in the conventional electrostatic oil applicator, the lubricant is supplied from the lubricant supply pipe into the cup-shaped body as it is, so the device is placed downwardly against the object to be oiled, such as a belt-shaped plate. When oiling is carried out with the cup-shaped body facing upward, there is also the drawback that the lubricating agent supplied to the cup-shaped body overflows downward, making it impossible to perform a good oiling operation.

Therefore, the present applicant filed Japanese Patent Application No. 58-19143,
Even when the amount of lubricant supplied is extremely small, the lubricant can be electrostatically atomized and radiated continuously to form a thin, uniform oil film on the surface of the object being coated. At the same time, the present invention provides an electrostatic lubricating device that can perform good lubricating work regardless of the installation orientation of the device.

FIG. 1 is a partially sectional side view showing an example of the electrostatic oil applicator.

In the figure, reference numeral 1 denotes a main body housing an air motor (not shown) as a rotational drive source, and a rotating shaft 2 of the air motor extends forward and has a cup-shaped body 3 fixed to its tip.

The cup-shaped body 3 is formed integrally with a substantially cylindrical outer cylinder 4, a partition wall 5 that closes the axial center of the outer cylinder 4, and a diameter that gradually decreases toward the partition wall 5. It consists of an inner cylinder 6 in the shape of a truncated cone that becomes larger, and slits 7 are formed at required intervals between the partition wall 5 and the outer cylinder 4, and although not shown, DC
A DC high voltage of about -80 to 120KV is applied.

Reference numeral 8 denotes a lubricant supply pipe for supplying a lubricant such as rust preventive oil into the cup-shaped body 3, and is screwed into a lubricant passage 9 formed at the front end of the main body 1.
The lubricant passage 9 opens on the side surface of the main body 1 and is connected to a lubricant supply source via a nipple and a paint hose (not shown).

This lubricant supply pipe 8 is provided with a lubricant atomizing mechanism 10 as shown in FIG.

The lubricant atomization mechanism 10 includes an inner pipe 11 through which the lubricant passes, and a required pressure (for example, 0.1 to 1.0 Kg/cm ² ) from a compressed air supply source (not shown) to the outside thereof.
The compressed air supplied through the compressed air supply hose 13 is jetted out from the outer tube 12, and
A so-called air atomization method is used in which the lubricant is atomized by the air flow. A lubricant discharge hole 14 is bent at the tip of the inner tube 11 at right angles to the inner tube 11 .

The lubricant discharge hole 14 is oriented in the horizontal direction perpendicular to the rotating shaft 2, and the outer cylinder 4 of the cup-shaped body 3 is
A lubricant supply pipe 8 is disposed so as to face the inner peripheral surface of the lubricant supply pipe 8.

The inner circumferential surface of the outer cylinder 4 is composed of a truncated conical surface 15 whose diameter increases toward the tip, and a cylindrical inner surface 16 that communicates with the truncated conical surface 15.

Then, while the cup-shaped body 3 is driven to rotate at a high speed of, for example, about 20,000 rpm and a high voltage is applied,
The lubricant is supplied to the inner pipe 11 of the lubricant supply pipe 8 through the lubricant passage 9 of the main body 1, and the outer pipe 1
When compressed air is supplied to the lubricant 2, the lubricant that has reached the lubricant discharge hole 14 is atomized by the compressed air jetted from the outer periphery of the lubricant, and is atomized by the truncated conical surface 15 of the outer cylinder 4 of the cup-shaped body 3. Therefore, even when the amount of lubricant supplied is extremely small, the lubricant does not form droplets and accumulate at the tip of the lubricant supply pipe 8, unlike in the past. The lubricant is continuously atomized from the lubricating agent discharge hole 14 and formed into a cup-shaped body 3.
A constant amount will be supplied at all times.

The lubricant sprayed in a fixed amount onto the truncated conical surface 15 of the outer cylinder 4 becomes a thin film due to centrifugal force and is gradually transferred to the tip side, and is transferred from the tip side of the outer cylinder 4 due to centrifugal force and electrostatic force. It is electrostatically atomized and radiated evenly onto the object to be oiled.

As described above, according to the electrostatic oil applicator shown in FIGS. 1 and 2, even when the amount of lubricant supplied is extremely small, the lubricant is supplied from the lubricant supply pipe 8 to the cup-shaped body 3. It is possible to supply the oil continuously without interruption, and it is possible to form a uniform thin oil film without uneven oil application without causing a breathing phenomenon. In the experiment, the amount of lubricant supplied was 0.1cc/
Even if it is a minute amount, apply the lubricant to the cup-shaped body 3.
It has been confirmed that a stable supply can be provided.

Further, according to this, the lubricant is supplied to the lubricant discharge hole 1.
4 is sprayed onto the truncated conical surface 15 of the cup-shaped body 3 and is supplied to adhere to the truncated conical surface 15, so even if the device is installed facing upward, the coating on the cup-shaped body 3 is prevented. The lubricant can be supplied smoothly and does not interfere with the lubricating work.

[The problem that the idea attempts to solve]

However, when the present inventors conducted further experimental research on the electrostatic oil applicator thus improved, it was discovered that the following problem occurred.

That is, when spraying and supplying the lubricant to the truncated conical surface 15 of the cup-shaped body 3, the lubricant discharge hole 14 is arranged to face the horizontal direction orthogonal to the rotation axis 2 as described above, and the lubricant is When the lubricant is sprayed radially from the lubricant discharge hole 14 by the atomization mechanism 10, a part of the sprayed lubricant particles is applied to the main body 1 of the cup-shaped body 3 by the centrifugal force of the cup-shaped body 3 rotating at high speed. It was found that the liquid was scattered to the outside through the opening 17 formed on the side.

The lubricant particles scattered from the opening 17 in this way are considerably coarser particles than the lubricant particles that are atomized and emitted from the tip of the cup-shaped body 3, and therefore do not allow the device to When installed downward from above, these coarse lubricant particles fall directly onto the object to be oiled, causing uneven lubricating on the surface, and at the same time adhering to the front end of the main body 1, causing droplets to form. There is a fear that this may drop directly onto the object to be oiled, forming a thick oil film called an oil spot, resulting in poor oil application.

Therefore, the present invention has further improved the conventional device.
Even when the supply of lubricant is extremely small,
The lubricant can be continuously supplied into the cup-shaped body from the lubricant supply pipe and electrostatically atomized, and the lubricant supplied into the cup-shaped body is scattered to the outside from the opening on the main body side. The purpose of the present invention is to provide an electrostatic lubrication device that does not cause any lubrication.

[Means to solve the problem]

In order to achieve this purpose, the present invention provides a lubricating agent inside a cup-shaped body that is fixed to the tip of a rotating shaft connected to a rotational drive source built into the main body of the device, driven to rotate at high speed, and to which a high voltage is applied. In an electrostatic oil applicator in which a lubricant supply pipe having an atomization mechanism is inserted, the lubricant supply pipe has a double-tube structure consisting of an inner pipe for feeding the lubricant and an outer pipe for sending compressed air for atomization. The lubricant atomizing mechanism of the lubricant supply pipe is formed in the peripheral wall of the outer tube with the tip closed, and extends straight from the front end of the device body toward the cup-shaped body in parallel with the rotation axis. an air outlet,
It consists of a lubricant discharge hole that opens at the tip of an inner tube that is bent toward the air outlet, and
The inner circumferential surface of the perforation that forms the air outlet is inclined at a certain angle from the direction perpendicular to the rotation axis toward the tip of the cup-shaped body, and is bent into the perforation at the same angle as the inclination angle. The lubricant discharge hole of the inner tube is inserted concentrically.

[Effect of invention]

According to the present invention, the perforation that is formed in the lubricant supply pipe and serves as the air outlet of the lubricant atomizing mechanism is bored with an inclined inner circumferential surface, and the inner cylinder is attached to the perforation at the same angle. Since the lubricant is inserted at an angle, the lubricant is sprayed along the inclination from the air outlet of the lubricant supply pipe toward the tip side of the cup-shaped body.

Therefore, the lubricating agent particles are prevented from scattering from the opening formed on the rear end side of the cup-shaped body, and the amount of scattering is significantly reduced, and the relatively coarse lubricant particles that are scattered are prevented from scattering. Eliminates the problem of liquid falling directly onto the surface of the object to be oiled or adhering to the front end of the main body of the lubricant and, when reaching a certain amount, becoming droplets and falling directly onto the object to be oiled. be done.

〔Example〕

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

FIG. 3 is a partially sectional side view showing an example of the electrostatic oil applicator according to the present invention, and parts common to those in FIG. 1 are designated by the same reference numerals and detailed explanation thereof will be omitted.

As shown in FIG. 3, the lubricant supply pipe 8' is
It is formed into a double pipe structure consisting of an inner pipe 11' for sending lubricant and an outer pipe 12' for sending compressed air for atomization.
It extends straight from the front end of the device main body 1 toward the cup-shaped body 3 parallel to the rotating shaft 2.

The outer tube 11' has its tip closed and has an air jet port 18 formed in its peripheral wall, and the inner tube 12' has a lubricant discharge hole 14' formed at its tip to allow the air jet to flow through the air jet. It is bent toward the outlet 18, and the air jet port 18 and the lubricant discharge hole 14' form a lubricant atomizing mechanism 10'.

In addition, the inner peripheral surface of the perforation forming the air outlet 18 is
The lubricant is discharged from an inner tube 11' which is inclined at a certain angle from a direction perpendicular to the rotating shaft 2 toward the tip side of the cup-shaped body 3, and is bent at the same angle as the inclination angle into the perforated hole. Holes 14' are inserted concentrically.

The lubricant discharge hole 14' is connected to the cup-shaped body 3.
It is configured to be inclined at an angle of about 30 degrees toward the tip side of the cup-shaped body 3 from the horizontal direction perpendicular to the rotation axis 2 that rotationally drives the cup-shaped body 3, and to face the inner peripheral surface of the outer cylinder 4 of the cup-shaped body 3. has been done.

By applying a high voltage to the cup-shaped body 3 and driving it to rotate at high speed, the lubricant is supplied to the inner pipe 11' of the lubricant supply pipe 8', and at the same time compressed air is supplied to the outer pipe 12'. When the lubricant reaches the opening of the lubricant discharge hole 14' formed at the tip of the inner tube 11', the lubricant reaches the outer tube 1 formed around it.
The air is atomized by compressed air that is ejected diagonally from the air outlet 2' along the inclination angle of the inner circumferential surface of the air outlet 18, and is atomized toward the inner circumferential surface of the outer cylinder 4 of the cup-shaped body 3. be done.

Here, since the lubricant discharge hole 14' is inclined at an angle of about 30 degrees from the horizontal direction perpendicular to the rotating shaft 2 toward the tip side of the cup-shaped body 3 as described above, the lubricant discharge hole 14' The lubricant sprayed from the hole 14' is applied along the slope of the truncated conical surface 15 formed on the inner circumferential surface of the outer cylinder 4 of the cup-shaped body 3 so that the diameter increases toward the tip. Moreover, since it is radiated to a relatively distant place from the opening 17 formed at the rear end of the cup-shaped body 3, the lubricant is atomized and sprayed from the lubricant discharge hole 14' of the lubricant supply pipe 8'. The amount of lubricant particles scattered outside from the opening 17 of the cup-shaped body 3 is significantly reduced.

In particular, according to the experimental results, as in this embodiment, the inclination angle of the lubricant discharge hole 14' is approximately 30 degrees from the horizontal direction perpendicular to the rotating shaft 2 toward the tip side of the cup-shaped body 3.
As shown in FIG. It was verified that almost no lubricant particles were scattered to the outside from the opening 17.

Furthermore, since the lubricant supply pipe 8 extends straight from the front end surface of the main body 1, the cup-shaped body 3 can be easily attached and detached during maintenance, etc., and the paint supply pipe 8 can be bent. Also, the cup-shaped body 3 is not damaged by the paint supply pipe 8.

In addition, by bringing the paint supply pipe 8 closer to the rotation axis, it can be separated from the truncated conical surface 15, and even if the cup-shaped body is downsized, it can be maintained sufficiently by adjusting the interval. The lubricant can be supplied in an atomized state.

As described above, according to this embodiment, the lubricant can be continuously and stably supplied to the cup-shaped body 3 regardless of the amount of lubricant supplied, and the lubricant can be continuously and stably supplied to the cup-shaped body 3. Since the amount of lubricant particles scattered from the opening 17 on the side of the main body 1 is extremely reduced, a uniform thin oil film can always be formed on the surface of the object to be oiled regardless of the installation direction of the device. effective.

In the above-mentioned embodiment, the case where the lubricant discharge hole 14' is arranged toward the inner circumferential surface of the outer cylinder 4 of the cup-shaped body 3 has been described, but the present invention is not limited to this. The lubricant discharge hole 14' may be disposed toward the truncated conical inner cylinder 6 side.

As described above, according to the present invention, the lubricant can be sprayed diagonally toward the tip side of the cup-shaped body from the straight lubricant supply pipe arranged parallel to the rotation axis. Therefore, the lubricant particles atomized and sprayed from the lubricant discharge hole are prevented from scattering from the opening formed on the rear end side of the cup-shaped body, and the amount of scattering is significantly reduced. The relatively coarse particles of the lubricant that are scattered fall directly onto the surface of the object to be oiled, or the particles of the scattered lubricant adhere to the front end of the main body of the device, reach a certain amount, and turn into droplets, causing the oil to be coated. This eliminates the problem of dripping directly onto the object, and has the excellent effect of always forming a uniform thin oil film on the object.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view of an electrostatic oil applicator shown for comparison, Figure 2 is a sectional view showing the lubricant supply pipe, and Figure 3 is an electrostatic oil applicator according to the present invention. FIG. 2 is a partially cross-sectional side view showing an example of the present invention. Explanation of symbols, 1...Main body, 2...Rotation axis, 3...
...Cup-shaped body, 8,8'...Lubricant supply pipe,
10, 10'... Lubricant atomization mechanism, 14, 14'...
...Lubricant discharge hole.

Claims (1)

[Scope of utility model registration request] A lubricant supply device having a lubricant atomization mechanism is placed in a cup-shaped body 3 which is fixed to the tip of a rotating shaft 2 connected to a rotational drive source built into the device main body 1 and driven to rotate at high speed, and to which a high voltage is applied. In the electrostatic oil applicator in which the pipe is inserted, the lubricant supply pipe 8'
It is formed into a double pipe structure consisting of an inner pipe 11' for sending lubricant and an outer pipe 12' for sending compressed air for atomization.
The lubricant atomizing mechanism 10' of the lubricant supply pipe 8' extends straight from the front end of the device main body 1 toward the cup-shaped body 3 in parallel with the rotating shaft 2, and the lubricant atomizing mechanism 10' of the lubricant supply pipe 8' is connected to the outer tube 12' whose tip is closed. Air outlet 1 drilled in the peripheral wall
8, and a lubricant discharge hole 1 that opens at the tip of the inner tube 11' bent toward the air outlet 18.
4', and the inner circumferential surface of the perforation forming the air outlet 18 is inclined at a certain angle from the direction perpendicular to the rotating shaft 2 toward the distal end side of the cup-shaped body 3. , lubricant discharge hole 1 of inner tube 11' bent at the same angle as the inclination angle.
An electrostatic oil application device characterized in that 4' are inserted concentrically.