JPH0113575Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention creates a uniform thin oil film by electrostatically applying a lubricant such as anti-rust oil to the surface of a strip-shaped steel plate, aluminum plate, copper plate, etc. In particular, an electrostatic oil applicator that supplies a lubricant to a cup-shaped body to which a high voltage is applied and is driven to rotate at high speed and electrostatically atomizes the lubricant at a predetermined speed in the vertical direction. This invention relates to an improvement in an electrostatic oil applicator that is horizontally disposed opposite to a belt-shaped oiled object that is continuously transferred.

[Prior art and its problems]

This type of electrostatic oil applicator is, for example, DC-80~
A high voltage of about 120Kv is applied and about 20,000~
A lubricant such as anti-rust oil is supplied to a cup-shaped body that is driven to rotate at a high speed of about 50,000 rpm, and the lubricant is emitted in atomized form from the tip of the cup-shaped body, and the cup-shaped body is used as a cathode and grounded. An electrostatic field is formed between the two electrodes using the continuously transferred object to be coated as an anode, and the lubricant particles charged and radiated from the cup-shaped body are electrically applied to the surface of the object to be coated, which is the opposite pole. It is designed to be applied electrostatically by suction force, and is installed in the production line of steel strips, etc., and used to form a uniform thin oil film on the surface of the steel sheets for purposes such as rust prevention. ing.

By the way, in the final manufacturing process of such steel strips, desired printing is sometimes applied directly onto the thin oil film that has been formed on the surface. There is a need to form the thin oil film extremely uniformly and extremely thinly.

In order to apply extremely fine oil to the surface of the object to be oiled, such as a strip steel plate, to form an extremely thin oil film, the amount of lubricant supplied to the cup-shaped body of the electrostatic oil applicator must be adjusted. It is necessary to control the amount to a very small constant level, but in order to achieve this control, a strip steel plate is transported horizontally and electrostatic oil applicators are placed facing each other from above and below on both sides to apply electrostatic oil. It is more preferable to use a method in which a strip steel plate is transported in a vertical direction and electrostatic oil applicators are disposed facing each other on both sides from the left and right. That is, in the former case, the oil is supplied into the cup-shaped body of an electrostatic oil applicator placed oppositely from below to the steel strip, and into the cup-shaped body of an electrostatic oil applicator placed oppositely from above. While it is extremely difficult to evenly supply an extremely small amount of lubricant equal to the amount of lubricant, in the latter case, the electrostatic lubricant is placed horizontally opposite each other in the cup-shaped body. This is because it is easy to uniformly supply the same amount of lubricating agent to both sides, and uniform lubricating can be applied to both sides of the steel strip.

Therefore, when applying extremely fine oil in the past, a belt-shaped object to be oiled, such as a belt-shaped steel plate, is continuously conveyed vertically at a predetermined speed, and an electrostatic oil applicator is used to apply the oil to the object. Electrostatic oil applicators are used that are placed horizontally facing each other from both sides of the object.

By the way, when electrostatically applying oil to a relatively wide plate-like object that cannot be coated entirely on one side with a single electrostatic oil applicator, multiple electrostatic oil applicators are biased toward each other. It is necessary that the spray patterns of the lubricant emitted from the cup-shaped bodies of adjacent electrostatic lubricators are arranged in parallel and partially overlap each other when viewed from the direction of transport of the object to be coated. Therefore, as mentioned above, an electrostatic oil applicator of the type in which the electrostatic oil applicator is horizontally arranged opposite to the object to be oiled that is transported vertically is used to statically apply it to a wide plate-shaped object to be oiled. In the case of electrostatic lubrication, a plurality of electrostatic lubrication machines must be vertically biased and arranged side by side on one side of the object to be oiled.

However, when multiple electrostatic oil applicators are placed side by side in a vertically biased manner, the lubricant adhering to the surface of the main body of the electrostatic oil applicator located above becomes droplets and drips. However, under the influence of the high voltage applied to the cup-shaped body of the electrostatic oil applicator located below, these become relatively coarse lubricant particles and are adsorbed onto the surface of the object to be oiled, forming oil spots. It has the disadvantage of producing a thick oil film (defect in lubrication) called
When these oil spots occur, when printing is performed directly on the oil film formed on the surface of the object to be oiled, the printing ink does not adhere well and causes printing unevenness, which is a serious problem.

In addition, since an electrostatic field is created between the electrostatic oil applicator and the object to be oiled, the droplets of lubricant formed on the main body of the electrostatic oil applicator are removed from the main body at the same time. It also had the disadvantage of being directly adsorbed onto the object to be oiled, forming a thick oil film and causing poor oil application.

[Purpose of invention]

Therefore, the present invention aims to prevent the lubricant adhering to the surface of the electrostatic lubricator from dripping in the form of droplets and directly adsorbed onto the surface of the object to be lubricated, or by using an electrostatic lubricant installed below. This prevents the particles from becoming relatively coarse particles under the influence of the machine's high voltage and being adsorbed onto the surface of the belt-shaped oiled object, and prevents thick oil films such as oil spots from forming on the surface of the object. It is an object of the present invention to provide an electrostatic oil coating device capable of forming an extremely uniform and extremely thin oil coating film without causing oil formation.

[Structure of the idea]

In order to achieve this objective, the present invention has an electrostatic oil applicator that supplies lubricant to 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 an electrostatic oil applicator installed horizontally opposite to a belt-shaped object to be coated that is continuously transported by The inclined plate to be collected is
The electrostatic oil applicator is arranged directly below the electrostatic oil applicator in a downwardly inclined state from the cup-shaped body provided at the tip of the electrostatic oil applicator toward the rear end of the main body. shall be.

[Effect of invention]

According to the present invention, the droplets of the lubricant that adhere to and drip from the electrostatic lubricant are collected along the inclined plate disposed below, so that the droplets are collected directly or relatively coarsely. It does not form particles and become adsorbed on the surface of the object to be oiled, and the occurrence of uneven oil application such as oil spots is prevented.

〔Example〕

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

FIG. 1 is a front view schematically showing an example of an electrostatic oil applicator according to the present invention, and FIG. 2 is a perspective view showing the main parts thereof. A carry-in port 4 and a carry-out port 5 for carrying in and out the belt-shaped oiled object 3 that is continuously transferred at high speed.
The object to be oiled 3 is placed in a chamber 6 formed above and below.
There are two electrostatic oil applicators R1 and R2 on the left and right through the
, and L1 and L2 are arranged above and below.

These electrostatic oil applicators R1, R2, L1 and L2
The cup-shaped bodies 7 to which a high voltage is applied and are driven to rotate at high speed are horizontally disposed facing the object 3 to be oiled. And electrostatic oil applicator R1 and R
2, L1, and L2 are arranged so as to be offset from each other in the width direction of the object 3 to be oiled, and the spray patterns of the atomized lubricant emitted from the cup-shaped body 7 are aligned with each other as shown by the arrow F. They are formed so that they partially overlap when viewed from the direction of transport of the object 3.

In the figure, 8R and 8L are columns arranged on the left and right sides of the chamber 6 to horizontally support the electrostatic oil applicators R1 and L1, and 9 is externally fitted onto the columns 8R and 8L so as to be vertically slidable. Main body 1 of electrostatic oil applicator R1, L1 respectively
This is a support member that attaches and supports the rear end portion formed of an insulating material of 0.0.

The support member 9 is composed of a bush pipe 11 to which the electrostatic oil applicators R1 and L1 are fixed, and a set screw 12 that fixes the bush pipe 11 so as to be vertically slidable along the support columns 8R and 8L.

Although not shown in the drawings, the electrostatic oil applicators R2 and L2 similarly slide up and down on columns that are spaced apart from the columns 8R and 8L by a required distance in the width direction of the object 3 to be oiled. Mountable and supported.

13R and 13L are electrostatic oil applicators R1 and R, respectively.
2 and L1, L2, and is an inclined plate that collects droplets of lubricant dripping from the electrostatic lubricating machines R1, R2 and L1, L2.

The inclined plates 13R, 13L are made of an insulating material with high dielectric strength and dielectric constant, such as vinyl chloride, acrylic, epoxy, polyethylene, polypropylene, acetal resin, or fluororesin, and are made using an electrostatic oil applicator. R1 and R2, L1 and L
The pillars 8R, 8L protrude from the tip of the main body 10 of No. 2 toward the cup-shaped body 7 side, and are inclined downward from the cup-shaped body 7 side to the rear end side of the main body 10.
The support member 14 is fitted onto the outside of the support member 14 so as to be vertically slidable.

This support member 14 is composed of a bush pipe 15 for mounting and supporting the inclined plates 13R and 13L, and a set screw 16 for fixing the bush pipe 15 so as to be vertically slidable along the columns 8R and 8L.

Note that the upper surfaces of the inclined plates 13R and 13L are brought very close to the lower surfaces of the tips of the main bodies 10 of the electrostatic oil applicators R1 and R2, L1 and L2.

Further, a drain pipe 16 is provided at the bottom of the chamber 6 to collect and reuse the dropped lubricant.

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

First, a high voltage of about DC-80 to 120 Kv is applied to each cup-shaped body 7 of the electrostatic oil applicator R1, R2, L1, and L2, and the cup-shaped body 7 is
The belt-shaped object 3 to be coated, such as a belt-shaped steel plate, is continuously transferred at a predetermined speed in the direction of arrow F by rotating at a high speed of about 20,000 to 50,000 rpm, and at the same time, the inside of each cup-shaped body 7 is coated with anti-rust oil, etc. The oil agent is supplied at a rate of, for example, about 1 c.c./min.

As a result, an electrostatic field is created between the two poles, with the cup-shaped body 7 serving as a cathode and the grounded object 3 to be coated as an anode, and the minute particles of the lubricant charged and radiated from the cup-shaped body 7 move to the opposite pole. An extremely thin oil film is formed on the surface of the object 3 to be oiled by electric attraction.

As time passes, lubricant particles etc. oversprayed from the electrostatic oil applicators R1 to L2 and floating in the chamber 6 adhere to the surfaces of the main bodies 10 of the electrostatic oil applicators R1, R2, L1 and L2. When this reaches a certain amount, droplets are formed and dripped downward as shown in FIG.

Here, below each electrostatic oil applicator R1 to L2,
Since the inclined plates 13R and 13L are disposed close to each other, the droplets of the lubricant falling onto the inclined plate 1
It is collected by 3R and 13L. Therefore, the droplets dripping from each electrostatic oil applicator are directly adsorbed on the surface of the object 3 to be oiled, or fall near the cup-shaped body 7 of the electrostatic oil applicator disposed below. Then, it becomes coarse lubricant particles again and is no longer adsorbed on the surface of the object 3 to be oiled, preventing the occurrence of oil spots, etc., and making it possible to always apply uniform and fine oil. .

Note that the lubricant adhering to the lower surfaces of the inclined plates 13R, 13L is also collected along the inclined surfaces of the inclined plates 13R, 13L, so that it does not drip as droplets.

Further, although the figure shows an example in which the inclined plates 13R and 13L are formed into a flat plate shape, they are not limited to this, and may be formed into a gutter shape, for example.

Further, the tips of the inclined plates 13R and 13L are not limited to being slightly spaced apart from the main bodies 10 of the electrostatic oil applicators R1 and L1 as shown in the figure, but may be in contact with each other.

[Effect of idea]

As described above, according to the present invention, the lubricant adhering to the surface of the electrostatic lubricator drips in the form of droplets, and is directly adsorbed on the surface of the object to be oiled, or This prevents particles from adsorbing on the surface of the belt-shaped oiled object, and forms an extremely uniform and extremely thin oil film on the surface of the oiled object without forming thick parts of the oil film such as oil spots. It has the excellent effect of being able to form.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing an example of an electrostatic oil applicator according to the present invention, and FIG. 2 is a perspective view showing the main parts thereof. Explanation of the symbol, 3... Belt-shaped oiled object, R1, R
2, L1, L2... Electrostatic oil applicator, 7... Cup-shaped body, 13R, 13L... Inclined plate.

Claims (1)

[Scope of utility model registration request] An electrostatic lubricant that supplies lubricant to a cup-shaped body to which a high voltage is applied and is driven to rotate at high speed and electrostatically atomizes the lubricant, is used to continuously transport a belt-shaped object to be coated at a predetermined speed in the vertical direction. In an electrostatic oil applicator installed horizontally opposite to the electrostatic oil applicator, an inclined plate receives and collects droplets of lubricant adhering to and dripping onto the surface of the electrostatic oil applicator. An electrostatic oil applicator, characterized in that the electrostatic oil applicator is disposed directly below the electrostatic oil applicator in a downwardly inclined state from the cup-shaped body provided at the tip of the machine body toward the rear end of the body. oil equipment.