JPS6314655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating apparatus and a coating method for coating a long object.

Conventionally, there are two methods for applying paint to long objects such as rope-shaped objects, steel bars, wire rods, etc. Another method involves moving a coating device to coat an object that is difficult to move, and the present invention belongs to the latter.

First, the former method of painting includes, for example, a method using a die (Special Publication No. 54-1740);
A method using a roll (Japanese Patent Application No. 54-94530), a method using a belt (Japanese Patent Application No. 52-63396), and a method of inserting it into a mouthpiece that has approximately the same external shape as the object to be coated (Japanese Patent Application No. 16330-1972) ), but all of these methods require a high shear rate during coating, making it difficult to uniformly apply a thick film of several tens of microns or more, and furthermore, it is difficult to coat the surface of the object to be coated. There are problems such as difficulty in obtaining a uniform film thickness when there are irregularities, and at the same time, it cannot be used to coat long objects that have already been installed and cannot be moved. It is.

Furthermore, in JP-A-50-123144, the coating tank is provided with a supply port and a discharge port for the film-forming solution, and a packing is provided in the bottom slit of the coating tank to allow the hoop material to move by being pulled upwards, and A coating apparatus has been disclosed which is characterized in that a partition plate is provided in a tank to exclude bubbles together with an excess supply of film-forming liquid. However, this coating device performs dip coating by passing the object to be coated through a fixed tank containing the coating liquid, making it impossible to coat extremely long objects or objects that are difficult to move. It is.

Also, patent application No. 1977-107764 and patent application No. 52-2182.
In this method, the substrate to be coated (substrate to be coated) is immersed in the coating liquid in a tank, the coating liquid is discharged from below to the outside of the tank, and the substrate is pulled up relative to the liquid level. A device is disclosed. In addition to the above-mentioned problems due to the fact that the tank is fixed, this device requires that the entire area to be coated be immersed in the tank at the same time. Dimensions, especially length, are very limited.

Further, JP-A-50-65537 discloses a liquid coating device comprising a nozzle having an opening at the upper end and a liquid supply mechanism for supplying liquid into the nozzle and causing the liquid to rise to the opening by surface tension. An apparatus is disclosed. In this device, the object to be coated passes through the raised part due to surface tension, so the outer diameter of the object that can be coated must be extremely thin, and the device is fixed. It also has the problems mentioned above.

In any case, with these devices, it is extremely difficult to coat fixed, elongated objects that are difficult to move.

On the other hand, the latter coating method, in which the coating device is moved to coat a fixed object,
For example, it is used to paint hanger ropes suspended from the main cables of long bridges. Conventionally, such hanger ropes have been painted manually by brushing, for example, by a person sitting on a chair suspended from the rope or riding in a gondola. However, these painting methods have drawbacks such as safety issues when working at high places, unfavorable environmental hygiene due to paint scattering, and low work efficiency due to manual work.

In view of the above situation, the present invention has been made regarding a coating device and a coating method that are effective for coating fixed long objects that are difficult to move.According to the present invention, A hollow coating means has an opening in the lower center through which a long object to be coated passes, a shower coater inside communicates with the outside, and a paint collection port at the bottom, and the coating means is connected to the object to be coated. a coating device characterized in that it is equipped with a drive means for moving the object downwardly, and the coating device is characterized in that the object to be coated penetrates through the inside of the coating device using the coating device. There is provided a coating method characterized in that the object to be coated is moved by the driving means downward in the length direction of the object to be coated.

An object of the present invention is to provide a coating device and a coating method suitable for coating a long object to be coated.

Another object of the present invention is to provide a coating device and a coating method that are particularly effective for coating long objects that are difficult to move because they have already been installed, particularly hanger ropes on long bridges.

Another object of the present invention is to provide a coating device and a coating method that can perform relatively thick and uniform coating by adjusting the viscosity of the coating material and the rate of descent of the coating means.

Another object of the present invention is a coating device that can quickly and uniformly coat objects with complex shapes such as rope-shaped objects without leaving any unpainted areas, and can perform coatings that are favorable for corrosion prevention. and a coating method.

Another object of the present invention is to provide a coating device and a coating method that are superior in safety and work efficiency at high places compared to manual coating, and do not cause environmental health problems due to paint scattering.

The above objects and other objects will become clear from the description of preferred embodiments of the coating apparatus and coating method of the present invention with reference to the accompanying drawings.

First, a specific example of the coating apparatus according to the present invention will be described with reference to FIGS. 1 to 9.

1 to 4 show a sectional view and a side view, respectively, of a hanger rope for a long bridge, which is an example of the long object to be coated. These hanger ropes are
It connects the main rope of a long bridge and the bridge girder, and functions to transfer the weight of the bridge girder to the main rope. 1st
Figures 1 and 2 are a sectional view and a side view of a hanger rope in which a plurality of steel wires are spirally formed. 3 and 4 are a cross-sectional view and a side view of a parallel wire mainly used in cable-stayed bridges. For this reason, these hanger ropes have spiral or parallel irregularities formed on their outer surfaces.

The shape of a long object to be coated, such as a hanger rope, that can be coated by the coating device and coating method of the present invention is not particularly limited, but it must be 2 to 15 cm thick and 5 to 100 meters long or longer. Painting over the entire area is preferred in order to achieve the above-mentioned object of the present invention. Further, it is preferable that the object to be coated is formed in a vertical shape, but it can also be formed at an angle of about 60 degrees or less with respect to the vertical line.

FIG. 5 shows an embodiment of a coating apparatus according to the present invention, which is equipped with a hollow coating means and a driving means, and the configuration of the coating apparatus according to the present invention will be explained based on this figure.

The coating device according to the present invention has a hollow coating means 1.
1 and a driving means 41.

The coating means 11 is a container 12 having a hollow interior, and the hollow container 12 has an opening 13 at least at the lower center thereof through which the elongated object 1 to be coated passes, and the inside thereof communicates with the outside. Shower coater 14 and paint collection port 15 at its bottom.
It is a hollow coating means comprising: One coating means 11 is provided for each long object to be coated.

The hollow container 12 in the coating means 11 is used to prevent the paint from scattering during painting and to facilitate the collection of unapplied paint. , and its inner diameter is not particularly limited, but it is preferably about 10 to 50 cm in terms of handling. The material is not particularly limited, but metals that are lightweight, have excellent physical strength, and are not deformed or altered by paint;
Plastic etc. are preferred.

The opening 13 provided at the bottom of the hollow container 12 is
This is an inlet for the elongated object 1 to pass through the inside of the container 12, and also allows excess paint applied to the object 1 by the shower coater 14 in the container 12 to pass through the container 12. The container 1 is filled with coating material 1, etc.
This is to prevent leakage from 2 to the outside. Therefore, the opening 13 must be located below the shower coater 14 and must have the function of preventing the paint from leaking out from the container 12 through the object 1 and the like. . That is, the opening 13 is preferably located below the shower coater 14, and the distance therebetween is preferably about 3 to 10 cm. and,
In order to prevent the paint from leaking through the object 1 to the outside from the container 12, the opening 13 is preferably formed of flexible packing 16. The opening 13 at the tip of the flexible packing 16 has a shape that is the same as or smaller than the cross section (diameter) of the object 1 to be coated. For this reason, when the object 1 to be coated passes from below to above the opening 13 (actually, the object 1 to be coated is fixed, the opening 13 moves downward relative to the object 1 to be coated). ), the tip of the flexible packing 16 of the opening 13 is always in close contact with the outer peripheral surface of the object 1 to be coated, and due to the flexibility and elasticity of the packing 16, the concave portion of the object 1 is Also, the tip of the packing 16 can be brought into close contact with the convex portion with almost no gap. Therefore, even if the coating means 11 is moved downward while painting, the object 1
There is almost no possibility that the paint will leak through the opening 13 of the hollow container 12. The flexible packing 16 may be perpendicular to the longitudinal direction of the object 1, but it is preferable to form the flexible packing 16 into a truncated cone shape as shown in FIG. This makes it easier to flow down from the slope of the opening 1 to the bottom of the hollow container 12.
3, which is preferable for preventing leakage from the opening 13. The material for the flexible packing may be any material as long as it has the above-mentioned flexibility and elasticity and is not deformed or altered by paint, and natural or synthetic rubber, plastic, etc. are suitable. The rear end of the flexible packing 16 is physically or chemically bonded to the end of the hollow container 12.

The shower coater 14 provided inside the hollow container 12 will be described with reference to FIG. 6, which is a sectional view taken along lines A and A' in FIG. 5.

The shower coater 14 sprays water onto the outer surface of the object 1 while moving downward to spray the paint onto the outer surface of the object 1.

Shower coater 14, as shown in FIG. are doing. Both the paint discharging section 17 and the paint pumping section 18 are preferably cylindrical metal or plastic pipes, and the inner diameter thereof is suitably about 0.5 to 1.5 cm.

The paint discharge part 17 is located inside the hollow container 12.
At any cylindrical place through which the object 1 to be coated passes (however, above the opening 13), so as to surround the side surface of the object 1 to be coated,
It is divided into a plurality of parts, each of which is fixed to the hollow container 12 via a paint pumping part 18. In FIG. 6, the paint discharge section 17 is divided into two parts. The purpose of dividing is to enable the object 1 to be easily placed inside the hollow container 12 (details will be described later). Then, the object 1 to be coated of the paint discharge section 17
A paint discharge hole 19 is bored on the side facing the paint so that the paint fed under pressure can be poured onto the outer surface of the object 1 to be coated. The paint discharge holes 19 need to be bored so that the paint can be uniformly poured onto all sides of the outer surface of the object 1 to be coated, and the paint discharge holes 19 may be either dotted or linear in shape. When the paint discharge holes 19 are dotted, it is preferable that the inner diameter is 0.5 to 2 mm and the holes are bored at intervals of 2 to 5 mm; on the other hand, when they are linear,
A linear discharge hole with a width of 0.5 to 1 mm is suitable. These paint discharge holes 19 can be provided in one stage (single row) or in a plurality of stages (multiple rows) in the paint discharge portion 17 facing the object 1 to be coated. The distance to the outer surface of
5 cm is preferred.

Further, it is preferable that the center of the space surrounded by the opening 13 and the paint discharge part 17 be substantially on the center line of the hollow container 12.

One end of the paint pumping section 18 is connected to the hollow container 12.
It communicates with the outside of the tank and can be connected to a paint supply hose 20 (see FIG. 5).

A feature of the coating method in the coating means 11 of the present invention is that a shower coater 14 is provided inside the hollow container 12 and communicates with the outside. That is, according to the shower coater 14, the paint is discharged from the paint discharge hole 19 of the paint discharge portion 17 to the object 1 to be coated.
Since the paint is discharged in a pouring manner towards the outer surface of the hollow container 12, there is almost no mist scattering within the hollow container 12, and therefore the paint is hardly scattered outside the hollow container 12. This eliminates environmental health problems caused by paint scattering.
Moreover, it is possible to uniformly coat the uneven surface of the object 1 without leaving any unpainted surface. Furthermore, it is sufficient to simply pump the paint, and the distance from the paint discharge hole 19 to the surface of the object 1 to be coated is short. Moreover, based on the fact that unapplied paint can be collected at any time from a paint collection port (to be described later), the structure of the coating means 11 can be extremely simplified and it can be downsized. It can be easily moved to different parts.

The present inventor has also investigated coating methods other than the shower coater 14 in the coating means 11, such as a spray method, a roller method, a brush coating method, and a dip coating method, but all of them have various defects and are not practical. Overall, I didn't like it.
That is, the spray method uses a spray paint machine instead of the shower coater 14, but since the paint is atomized, if there is a slight gap in the hollow container 12, the paint will scatter outward from that part. Unfavorable in terms of environmental hygiene. In addition, in order to uniformly coat the entire circumference of the object 1, many spray guns and accompanying air hoses are required, and the distance between the head of the spray gun and the surface of the object 1 must be kept to a certain extent (approximately 10 to 15 cm). ), the coating means itself becomes an extremely large device, making it difficult and impractical to perform coating operations at high places. Moreover, it was difficult to coat every inch of the narrow genital area of the rope shown in FIGS. 1 and 2.
Further, the roller method and the brush coating method use a pressure-feeding coating roller and a pressure-feeding brush in place of the shower coater 14, but in both cases, it is difficult to coat the concave portions of the object 1, and the coating tool It was impractical because it suffered from severe wear and a uniform coating could not be obtained. Furthermore, in the dip coating method, a shower coater 14 and a dip coating tank filled with paint are installed inside the hollow container 12 in place of the shower coater 14 and the opening 13. In this method, the paint is applied by moving the paint from the top to the bottom, but the paint easily leaks from the passage hole for the object 1 provided at the bottom of the coating tank filled with a large amount of paint. It was difficult to move the coating tank to a higher location.

In FIG. 5, the paint recovery port 15 is for taking out and recovering the paint that has not been applied to the object 1 out of the paint discharged from the paint discharge hole 19 from the hollow container 12. It is provided below the opening 13, preferably at the bottom of the hollow container 12. Therefore, it is preferable that the bottom of the hollow container 12 be shaped so that the unapplied paint flows into one place, and that the paint collection port 15 be provided in that part. Since the paint recovery hose 21 is connected to the outside of the paint recovery port 15, unapplied paint can be easily recovered without remaining inside the hollow container 12.

The paint supply hose 20 connected to the other end of the paint pumping section 18 and the paint recovery hose 21 connected to the paint recovery port 15 both reach the ground surface of the site where the object 1 to be coated is to be painted. The ground side end of the paint supply hose 21 is connected to a paint pressure pump, a paint tank, etc.
If the ground side end of the paint collection hose 21 is connected to a paint tank, the collected paint can be used again, thereby reducing paint loss.

In the present invention, the coating means 11 of the hollow container 12 equipped with the above-mentioned opening 13, shower coater 14, and paint collection port 15 is equipped with a guide caster and coating material for smooth driving of the hollow container 12. A brush for cleaning the surface of object 1,
A paint absorption brush for absorbing paint leaked from the opening 13 onto the surface of the object 1 to be coated, a repair brush for making the paint film applied by the shower coater 14 more uniform, etc. are attached as necessary. be able to.

The guide caster 22 is preferably attached to the outside of the lower part of the hollow container 12. This is effective for smoothly driving the coating means 11 downward with respect to the object 1 to be coated, and for positioning the object 1 to be coated at the center of the area surrounded by the paint discharge section 17 of the shower coater 14. . FIG. 7 shows a cross-sectional view of the guide caster 22, taken along lines B and B' in FIG. The guide caster 22 has a rotatable metal or plastic sphere 23 at its tip.
3 is attached to the lower outside of the hollow container via a holding cover 24 and a spring 25. As shown in FIG. 7, the guide caster 22 is preferably mounted so as to surround the object 1 to be coated from at least three directions at equal angles. It is preferable that the center point be on an extension line connecting the center point of the opening 13 and the center point of the opening 13. Then, the guide casters 22 are attached so that the metal balls 23 of all the attached guide casters 22 are in contact with the surface of the object 1 to be coated. The guide caster 22 installed in this manner may be installed in one stage, but it is preferable to install it in two or more stages as shown in FIG.

A cleaning brush 26 for cleaning the surface of the object 1 to be coated
is for removing dirt, dust, etc. adhering to the surface of the object 1 to be coated before painting, and like the guide caster 22 described above, the hollow container 1
It is preferable to attach it to the outside of the lower part of 2. This cleaning brush 26 is a relatively hard brush,
The tip must be in contact with the outer surface of the object 1 to be coated.

Furthermore, in the coating means 11 of the present invention, the paint hardly leaks from the opening 13 over the surface of the object 1 to be coated to the outside of the hollow container 12. It is preferable to attach the brush 27 in advance. The paint absorption brush 27 is applied to the object 1 to be coated.
Since it absorbs the paint dripping down the surface and leaking from the opening 13, a sponge, soft brush, or the like with excellent paint absorption properties is preferably used. Further, it is preferable that the paint absorption brush 27 is attached outside the lower part of the hollow container 12 and near the opening 13, and its tip is connected to the outer surface of the object 1 like the cleaning brush 26 described above. You need to keep it in contact.

Furthermore, in order to make the coating film applied by the shower coater 14 uniform and to eliminate uncoated areas, it is preferable to attach a repair brush 28 to the upper part of the shower coater 14. The repair brush 2
As the brush 8, one used for general painting can be used, and the tip thereof must be brought into contact with the circumferential surface of the object 1 to be coated, similarly to the cleaning brush 26 described above.

Although the upper part of the hollow container 12 may be left open, it is preferable to provide a lid to prevent foreign matter such as dirt and dust from entering. The lid may be continuously integrated with the sides, but a removable lid 29 may also be used. If a lid is provided, it is necessary to provide a passage hole 30 in the center thereof through which the object 1 to be coated passes.

Furthermore, as shown in FIG. 8, a hollow container 12 and openings installed inside and outside the container 12 are provided so as to be convenient for coating the object 1 that has already been installed and is difficult to move. 13, the shower coater 14, the repair brush 28, the paint absorption brush 27, the guide caster 22, the cleaning brush 26, etc. It is structured so that it can be divided into By this,
The installed object 1 can be placed inside the hollow container 12.

Next, regarding the drive means 41 for moving the coating means 11 downward with respect to the object 1 to be coated,
This will be explained based on FIGS. 5 and 9.

The driving means 41 mainly includes a driving wire 42 for moving the hollow container 12 downward (or upward) with respect to the object 1 to be coated, and a driving wire 42 for connecting the end of the wire 42 to the hollow container 12. It consists of wire hooks 43, 44 and a drive section 45 for driving the wire 42.

Figure 9 is a long bridge hanger rope (object 1)
FIG. 1 is a schematic overall view of a vehicle equipped with a coating device according to the present invention.

The driving wire 42 connects one hollow container 12
At least 22 wire hooks 4 are required for the wire hook 4, each having one end attached to the upper side of the hollow container 12.
3 and the other end of each is connected to the drive unit 45 installed on the ground 47 via a pulley 46 provided above the object 1 to be coated.
It is connected to a wire hook 44 provided on the lower side of the. The pulley 46 is preferably attached to the main cable 48 when painting a hanger rope (object 1) of a long bridge. The operation of connecting the drive wires 42 to the wire hooks 43 and 44 can be performed with the hollow container 12 placed on the ground. After performing this operation, by activating the drive unit 45, the hollow container 12, that is, the coating means 11, is
It can be freely moved upward or downward relative to the object to be coated 1 via the drive wire 42, and all of this operation can be performed on the ground.

Next, a coating method using the coating apparatus of the present invention will be explained.

Shower coater 14, opening 13, paint recovery port 15, and repair brush 2 if necessary
8, paint absorption brush 27, cleaning brush 26,
The hollow container 12 equipped with the guide caster 22 and the like is divided into two parts via the hinge 31 (see FIG. 8). Then, the object to be coated 1 is placed in a hollow container 12.
After being positioned on the center line of the space surrounded by the paint discharge portion 17, the divided hollow container 12 is closed and combined so as to wrap around the circumference of the object 1 to be coated. All this work can be done on the ground.

Next, one end of the driving wire 42 is connected to each of the wire hooks 43, and the wire 4
The other end of 2 is passed through a pulley 46 provided in advance on the upper part of the object 1 to be coated, and the drive unit 4 of the above-ground part 47
5 and then connected to the wire hook 44.

On the other hand, one end of a paint supply hose 20 is fitted to the outer end of the paint pressure feeding section 18 of the shower coater 14 attached to the hollow container 12, and the other end of the hose 20 is connected to a paint pressure pump (not shown). ) to the paint tank 32. The paint supply hose 20 can be made of a material that is flexible and does not deform or change in quality when it comes into contact with the paint, and its length is longer than the length of the object to be painted 1. It is preferable.

Then, one end of a paint recovery hose 21 made of the same material and length as the paint supply hose 20 is fitted into the paint recovery port 15 provided at the bottom of the hollow container 12, and the other end of the recovery hose 21 is fitted. The parts are connected to the paint tank 32.

After being equipped in this way, the drive section 45 is operated to move the hollow container 12 to the upper end of the object 1 to be coated. Next, the paint contained in the paint tank 32 is pumped by the paint pressure pump.
The surface of the object to be coated 1 is coated by feeding the paint through the paint supply hose 20 to the pressure feeding section 18 of the hollow container 12 and discharging it from the paint discharge hole 19 of the discharge section 17. The paint pumping pressure varies depending on the length of the object 1 to be coated (height from the ground to the coating means 11), the inner diameter of the paint supply hose 20 and the shower coater 14, the viscosity of the paint, etc. It is sufficient that a sufficient amount of paint can be discharged from the paint discharge hole 19 to spray the paint onto the outer surface. The amount of paint discharged from the entire paint discharge hole 19 varies depending on the purpose, but is preferably 1 c.c. to 2/min/cm ² .

When the coating on the object 1 starts, the drive unit 45
is actuated to move the hollow container 12 (that is, the coating means 11) downward relative to the object 1 via the driving wire 42. If the moving speed is too slow, the coating efficiency will decrease, and if the moving speed is too fast, there is a risk of leaving unpainted areas.
m/min is preferred.

In the hollow container 12, among the paint discharged from the paint discharge hole 19, the paint that has not been applied to the object 1 flows into the bottom of the container 12, and is passed through the paint recovery hose 21 from the paint recovery port 15. After that, it can be collected in the paint tank 32.

The paint that can be applied in the present invention is not particularly limited, but it is preferable to adjust the viscosity to 30 to 200 centipoise at the time of painting, taking into account that it will be applied with a shower coater. Further, the thickness of the coating film can be easily adjusted by adjusting the nonvolatile content and viscosity of the coating material, the amount of coating material discharged, the downward movement speed of the coating means 11, and the like.

The coating apparatus and coating method of the present invention have various superior technical effects compared to the above-described conventional manual coating method for long objects.

That is, since the coating is applied in a hollow container and by spraying with a shower coater, no scattering of the paint is observed, which is extremely favorable in terms of environmental hygiene. Further, even if the outer surface has complex irregularities, there will be no unpainted areas, and the coating can be efficiently and uniformly applied. Furthermore, most of the painting operations can be done on the ground, making it safer.
Furthermore, the coating film thickness can be easily adjusted.

In addition, since the coating method of the present invention uses a shower coater and brush coating, it has excellent technical effects as described above compared to other spray coating methods, roller coating methods, brush coating methods, and dip coating methods. ing.

[Brief explanation of the drawing]

Figures 1 and 3 are cross-sectional views of the hanger rope, Figures 2 and 4 are side views of the hanger rope, Figure 5 is a cross-sectional view of the coating device of the present invention, and Figure 6 is an illustration of Figure 5. , A' cross-sectional view, 7th
The figure is a cross-sectional view taken along lines B and B' in FIG. 5, and FIG.
FIG. 9 is a diagram of a specific example using the coating apparatus of the present invention. 1 to 9, 1: object to be coated, 11: coating means, 12: hollow container, 13: opening, 14:
Shower coater, 15: Paint collection port, 16: Flexible packing, 17: Paint discharge part, 1
8: Paint pressure feeding section, 19: Paint discharge hole, 20: Paint supply hose, 21: Paint collection hose, 22: Guide caster, 26: Cleaning brush, 27: Paint absorption brush, 28: Repair brush, 30 : Passing port, 31: Hinge, 32: Paint tank, 41: Driving means, 42: Driving wire, 43 and 4
4: Wire hook, 45: Drive unit, 48: Main cable.

Claims (1)

[Claims] 1. An opening in the lower center through which a long object to be coated passes,
A hollow coating means having a shower coater communicating with the outside and a paint collection port at the bottom, and a driving means for moving the coating means downward relative to the object to be coated. A painting device characterized by: