Patent Description:
Painting is applied to many structures including buildings for the purpose of giving design and protection thereto. Particularly, in moving bodies such as railway vehicles and automobiles, in order to give aesthetics and to reduce aerodynamic resistance, smoothing a surface of a paint film is required. There is a case where the paint film is formed of a single layer, but in order to secure the above characteristics, the paint film is formed of a multi-layer in many cases.

For example, when a paint film is formed on a metal surface, painting is performed to form a number of layers in the following procedure: the application of primer and drying to prevent rust after the roughening of the metal surface by a blasting process, puttying, drying, and polishing to cover roughness of the metal surface so as to secure smoothness, the application of surfacer, drying, and polishing to cover fine roughness of the putty surface, intermediate coat painting, drying, and polishing, and topcoat painting, drying, and polishing to give design to an uppermost surface.

Generally, painting is performed by the hand of a worker, or is performed using an automatic machine such as a robot. When a worker performs painting, the worker uses a spray, a brush, a roller, etc., and in the case of an object to be painted having such a height that the object to be painted cannot be reached by the hand of the worker, installing a scaffolding, etc. is required. In addition, when paint containing an organic solvent, etc. is used, a worker requires wearing protective equipment such as a mask and gloves, so that workability is reduced.

When a robot is used, capital investment is large, and when paint containing an organic solvent is used, a facility conforming to explosion-proof specifications is required, so that the amount of capital investment is further increased. In addition, a place where a robot is to be installed, and a place where the robot is to be retracted or an object to be painted is to be moved and heated when the object to be painted is heated are required.

On the other hand, there is a device that has a high degree of freedom of movement, and that uses a compact flying object to perform painting. For example, as a technique related to painting using a flying object, Patent Document <NUM> discloses "an airship including: an airship body in which a power supply device, a radio control device, a posture control device, a surveillance television control device are mounted; a balloon coaxially provided in an upper portion of the airship body; arms provided on the airship body radially in all directions to be orthogonal to an axis; a propulsion and posture control blower attached to an end of the same arm so as to be rotatable around an axis of the same arm, and having an axis orthogonal to the axis of the same arm; a level sensor provided in each of the arms; a manipulator attached to the airship body and carrying a surveillance television; and a general work device, an automatic window cleaning device, an automatic painting device, an automatic exterior wall cleaning device, etc. each of which is replaceably attached to a lower portion of the airship body via an attachment fitting". Patent Document <NUM> discloses a modular aerial operations system that includes an aerial vehicle capable of vertically taking off and landing, hovering and precisely maneuvering near walls and 216121PCEP other structures. In an aspect, the aerial vehicle paints one or more designated surfaces using detachable arms and equipment. The system may paint the designated surface in one of several available techniques using paint provided in a container. Patent Document <NUM> discloses systems and methods of coating an installed overhead conductor with an unmanned aerial vehicle. The unmanned aerial vehicles can attach to an installed overhead conductor and can apply a coating composition from one or more canisters. Patent Document <NUM> discloses a device for projecting a fluid onto a surface to be treated comprising a drone incorporating remote control means, at least one fluid projection means integral with said drone and designed to project said fluid onto said surface to be treated, a fluid pressurization unit, and a fluid supply pipe connecting said drone to said fluid pressurization unit, said pressurization unit comprising means for progressively varying a pressure in said fluid supply pipe.

Since the airship of Patent Document <NUM> includes the balloon having a high volume ratio occupied in the airship and having a small specific gravity, flight stability or posture stability is significantly affected by external disturbances such as wind. In addition, since it takes time to maintain the flight and posture stability of the entire device, the working time is increased accordingly.

An object of the present invention is to secure flight stability of a flying object in a short time.

The aforementioned object is solved by the invention according to the independent claim claims. Further preferred developments are described by the dependent claims.

According to one aspect of the present invention, flight stability of the flying object can be secured in a short time.

A configuration of a flying object of a first embodiment will be described with reference to <FIG>.

A flying object <NUM> includes a plurality of blades <NUM> to enable a flying object body <NUM> to fly. The flying object <NUM> rotates the blades <NUM> to fly, and changes the rotation speed to fly while changing the travelling direction and the rising position and speed. A controller <NUM> installed in the flying object <NUM> receives radio wave <NUM> transmitted from an external controller <NUM>, to control the rotation speed of the blades <NUM>. Particularly, the number of the blades <NUM> is not limited.

The flying object <NUM> includes a nozzle <NUM> in a lower portion of the flying object body <NUM>, the nozzle <NUM> including a first discharge port <NUM> and a second discharge port <NUM>. The nozzle <NUM> includes a movable unit <NUM>. The movable unit <NUM> changes a direction of the second discharge port <NUM> as shown by a broken line in <FIG> to change an angle <NUM> formed by the first discharge port <NUM> and the second discharge port <NUM>.

The nozzle <NUM> includes a paint supply port <NUM> to receive a supply of paint; a fluid supply port <NUM> to receive a supply of a fluid; an air supply port <NUM> for the first discharge port to receive a supply of a gas so as to spray the paint in a mist form from the first discharge port <NUM>; and an air supply port <NUM> for the second discharge port to receive a supply of a gas so as to spray the paint in a mist form from the second discharge port <NUM>.

The first discharge port <NUM> and the second discharge port <NUM> are located at positions that are not affected by an air flow to be generated from the blades <NUM> to perform flight. Specifically, the first discharge port <NUM> and the second discharge port <NUM> further extend outward from the flying object body <NUM> than the blades <NUM>, to secure a length <NUM>. In addition, valves may be installed inside the first discharge port <NUM> and the second discharge port <NUM> so as to adjust the discharge rate of the paint and the fluid to be discharged from the first discharge port <NUM> and the second discharge port <NUM>.

As described above, the flying object <NUM> of the first embodiment includes the blades <NUM> that enable the flying object body <NUM> to fly; a paint ejection mechanism (including the first discharge port <NUM>) that ejects the paint in a first direction; and a fluid ejection mechanism (including the second discharge port <NUM>) that ejects the fluid in a second direction that is a direction opposite the first direction.

Here, in <FIG>, the fluid ejection mechanism ejects (discharges) the fluid in the second direction that is a direction opposite the first direction; however, the present invention is not limited thereto, and the fluid ejection mechanism may eject the fluid in the second direction differing from the first direction by <NUM> degrees or more.

The flying object <NUM> includes the movable unit <NUM> that changes an angle formed by the paint ejection mechanism and the fluid ejection mechanism. The movable unit <NUM> changes the angle formed by the paint ejection mechanism and the fluid ejection mechanism, in a range of <NUM> degrees to <NUM> degrees. In addition, a tip of the paint ejection mechanism and a tip of the fluid ejection mechanism are located outside an end of the blades <NUM> with respect to the flying object body <NUM>. Here, the "outside" means an outside of a space formed when rotation trajectories of the blades <NUM> are extended in a rotation axis direction of the blades <NUM>.

In addition, the flying object <NUM> includes the nozzle <NUM> provided in the lower portion of the flying object body <NUM>. The paint ejection mechanism includes a first ejection port (first discharge port <NUM>) provided at one end of the nozzle <NUM>. The fluid ejection mechanism includes a second ejection port (second discharge port <NUM>) provided at the other end of the nozzle <NUM>.

A lower portion of the nozzle <NUM> is provided with the paint supply port <NUM> to which the paint is to be supplied, the fluid supply port <NUM> to which the fluid is to be supplied, a first gas supply port (air supply port <NUM> for the first discharge port) to which a first gas (air for the first discharge port) is to be supplied to eject the paint from the first ejection port (first discharge port <NUM>), and a second gas supply port (air supply port <NUM> for the second discharge port) to which a second gas (air for the second discharge port) is to be supplied to eject the fluid from the second ejection port (second discharge port <NUM>). In addition, the fluid to be ejected from the fluid ejection mechanism is, for example, any one of a gas, a liquid, and powder or a mixture thereof.

A configuration of a flying object system of the first embodiment, not according to the claims, will be described with reference to <FIG>.

Paint <NUM> is to be transported from a paint supply container <NUM> to the paint supply port <NUM> of the flying object <NUM> via a paint hose <NUM>. Air for the paint is to be transported from an air compressor <NUM> for the paint to the air supply port <NUM> for the first discharge port of the flying object <NUM> via an air compressor hose <NUM> for the paint.

The transported paint <NUM> and air are to be sprayed at the same time to paint an object <NUM> to be painted with the paint <NUM>. A fluid <NUM> is to be transported from a fluid supply container <NUM> to the fluid supply port <NUM> of the flying object <NUM> via a fluid hose <NUM> at the same time when the paint <NUM> is ejected from the first discharge port <NUM>.

Air for the fluid is to be transported from an air compressor <NUM> for the fluid to the air supply port <NUM> for the second discharge port of the flying object <NUM> via an air compressor hose <NUM> for the fluid. The paint hose <NUM>, the fluid hose <NUM>, the air compressor hose <NUM> for the paint, and the air compressor hose <NUM> for the fluid are used for the transport of the paint <NUM>, the fluid <NUM>, and air, but it is preferable that these hoses use a transport tube <NUM> to secure the flight stability of the flying object <NUM>.

The transported fluid <NUM> and air are to be ejected from the second discharge port <NUM> at the same timing when the paint <NUM> is ejected from the first discharge port <NUM>. In addition, the fluid <NUM> is to be ejected as the fluid <NUM> having a momentum equivalent to that of the paint <NUM> to be ejected from the first discharge port <NUM>. Here, the momentum is a product of the weight of a discharged substance and a discharge speed.

As described above, the fluid <NUM> is also to be ejected from the second discharge port <NUM> at the same time when the paint <NUM> is ejected from the first discharge port <NUM>, so that the flight of the flying object <NUM> can be stabilized, and a high-quality painted object can be obtained.

The second discharge port <NUM> is oriented in a direction opposite the paint <NUM> to be ejected from the first discharge port <NUM>. The angle <NUM> formed by the first discharge port <NUM> and the second discharge port <NUM> had better be set to <NUM> to <NUM>°. It is preferable that the angle <NUM> had better be set to <NUM> to <NUM>°. Here, the formed angle <NUM> is an angle formed at an intersection of center lines of the first discharge port <NUM> and the second discharge port <NUM>. This angle is defined as <NUM> to <NUM>°, and may be variable during painting.

In order to make this angle variable, the movable unit <NUM> such as a ball joint or a hinge had better be provided in a portion connecting the first discharge port <NUM> and the second discharge port <NUM> or in a portion connecting the flying object body <NUM> and the first discharge port <NUM> or the second discharge port <NUM>.

The movable unit <NUM> is capable of utilizing the discharge of the fluid <NUM> from the second discharge port <NUM> as a part of energy to move the flying object <NUM> upward, downward, rightward, and leftward. In addition, even when the flying object body <NUM> is inclined, the movable unit <NUM> prevents the first discharge port <NUM> from deviating from a position perpendicular to the object <NUM> to be painted, so that a stable high-quality painting surface without irregularities can be obtained.

As shown in <FIG>, the paint <NUM> to be ejected from the first discharge port <NUM> can be transported from the container outside the flying object <NUM> through the transport tube <NUM> to be supplied to the first discharge port <NUM>. At this time, the paint may be press-fed using a compressed gas, or may be transported using a pump.

As shown in <FIG>, in accordance with the claimed invention, the paint <NUM>, the fluid <NUM>, and are stored in the containers provided in the flying object <NUM>, to be supplied to the first discharge port <NUM> and the second discharge port <NUM>. Specifically, as shown in <FIG>, the lower portion of the nozzle <NUM> is provided with the paint supply container <NUM>, the compressor <NUM> for the paint, the fluid supply container <NUM>, and the compressor <NUM> for the fluid. The paint is to be transported from the paint supply container <NUM> to the paint supply port <NUM>. The first gas is to be transported from the compressor <NUM> for the paint to the first gas supply port <NUM>. The fluid is to be transported from the fluid supply container <NUM> to the fluid supply port <NUM>. The second gas is to be transported from the compressor <NUM> for the fluid to the second gas supply port <NUM>.

General paints such as oil paints, water paints, and powder paints can be used as the paint <NUM>; however, the present invention is not limited thereto. The paint is the paint <NUM> to be discharged from the first discharge port <NUM> of the flying object <NUM>, and the timing of discharge of the paint <NUM> may be continuous or intermittent; however, the present invention is not limited thereto. The paint <NUM> had better be ejected (discharged) as needed while a flight path of the flying object <NUM> is set according to the shape of the object <NUM> to be painted. Methods such as airless spraying, air spraying, and electrostatic painting can be used as a discharge method, and the discharge method is not limited as long as painting is performed without contact with the object <NUM> to be painted.

The fluid <NUM> is discharged from the second discharge port <NUM> according to the timing of discharge of the paint <NUM>, so that the flight of the flying object <NUM> and a direction of the paint <NUM> to be discharged can be stabilized. The fluid <NUM> to be discharged from the second discharge port <NUM> may be a gas, a liquid, or powder. Examples of the fluid <NUM> include, for example, a single gas or a mixed gas such as air, nitrogen, or carbon dioxide, water, an organic solvent, or a mixed liquid, a mixture of the gas and the liquid, a mixture of the gas and solid particles such as a polymer, ceramics, or metal, a mixture of the liquid and the solid particles, and a mixture of the gas, the liquid, and the solid particles.

The fluid <NUM> to be discharged from the second discharge port <NUM> may be sprayed similarly to the paint <NUM> to be discharged from the first discharge port <NUM>, may be discharged as a continuous fluid, or may be discharged in any form as long as the stability of the flying object <NUM> can be secured.

The controller <NUM> installed in the flying object <NUM> receives the radio wave <NUM> transmitted from the external controller <NUM>, to determine a flight path. Incidentally, the flight path may be determined by GPS, or may be determined by programming determined in advance while a camera is mounted in the flying object <NUM> and recognizes the shape of the object <NUM> to be painted automatically. In addition, a worker may operate and fly the flying object <NUM> using a controller while watching a painting situation.

After the paint <NUM> adheres to the object <NUM> to be painted, a dry gas or a heating gas may be discharged from the first discharge port <NUM> or the second discharge port <NUM> to dry the paint painted on the object <NUM> to be painted.

In addition, as shown in <FIG>, the painting time can also be further shortened by painting a plurality of places at once using a plurality of painting systems <NUM>. In this case, the external controller <NUM> may be used alone, or a plurality of the external controllers <NUM> may be used.

As described above, the flying object system of the first embodiment includes the flying object <NUM>, and the controllers <NUM> and <NUM> that adjust the timing of ejection of the paint <NUM> and the timing of ejection of the fluid <NUM>. The controllers <NUM> and <NUM> control the rotation speed of the blades <NUM> to cause the flying object body <NUM> to fly.

In addition, the flying object system of the first embodiment includes a plurality of the flying objects <NUM>, and the plurality of flying objects <NUM> are controlled by the controllers <NUM> and <NUM> to paint a plurality of places on the object <NUM> to be painted.

In addition, in a method for painting an object to be painted using the flying object according to claim <NUM>, the paint ejection mechanism ejects the paint <NUM> in the first direction to paint the object <NUM> to be painted in a non-contact manner.

According to the first embodiment of the method, there is no need for capital investment on or an installation space for a scaffolding for a painting worker and a painting robot, and painting in high places can be performed safely and quickly while securing painting quality on an object to be painted. In addition, even when maintenance on a paint film is required, the maintenance time can be shortened, and a painted object can be provided quickly. For example, the operating time of a railway vehicle or a building can be increased.

Here, a reference comparative example for comparison with the first embodiment will be described.

As a general painting method, painting by hand or painting using a robot is performed. When a large object to be painted is painted by hand, the installation of a scaffolding is required, and a worker is required to wear a protective mask or protective glasses. In addition, variations in painting quality may be generated depending on the skill level of a worker, or a desired quality may not be achieved. In addition, when a robot is used, capital investment to introduce an expensive robot, securing an installation space, securing a robot storage space for drying, or improving the heat resistance of the robot is required.

In the case of painting using a flying object, the discharge rate of paint is suppressed to make the flying object fly safely, or the flight is not stable since a flying object body receives a reaction when the paint is discharged, so that the workability is reduced, and a paint film is difficult to form in a short time.

A second embodiment of the method will be described with reference to <FIG>. The second embodiment is such that the first embodiment is applied to a railway vehicle. <FIG> is a side view of a railway vehicle to which painting is applied.

As shown in <FIG>, in an exterior wall of a railway vehicle <NUM>, a side surface portion <NUM> and an upper surface portion that is a ceiling are formed of a processed material obtained by processing a metal sheet. The side surface portion <NUM> of the railway vehicle <NUM> is provided with a door portion <NUM> that is an opening and closing door, and a window portion <NUM>. In addition, the upper surface portion of the railway vehicle <NUM> is provided with a pantograph <NUM>. The railway vehicle <NUM> is provided with a wheel <NUM>.

A paint film is to be formed on the exterior wall of the railway vehicle <NUM> by the above-described painting. A surface of the metal material is covered with the paint film of the embodiments physically to protect the surface of the metal material, and to prevent foreign matter, rainwater, etc. from coming into direct contact with the surface of the metal material. For this reason, the generation of metal corrosion on the surface of the metal material can be effectively prevented.

Further, design can be given to the railway vehicle by using a colored topcoat.

Hereinbelow, examples will be described with reference to <FIG>. In the examples, the above-described painting will be specifically described.

First, an aluminum sheet was prepared as the object <NUM> to be painted shown in <FIG>. Specifically, a 6N01 alloy was used among Al-Mg-Si alloys (<NUM> series aluminum alloys). The size was <NUM> in length × <NUM> in width and <NUM> in thickness.

First, a blasting process was performed to secure adhesion between an object to be painted and a paint film. The blasting process was performed by blowing crushed steel particles having a particle size of <NUM> as a grinding material on the aluminum sheet at a projection speed of <NUM>/s. After the blowing was completed, air blowing was performed, and it was visually confirmed that there were no remaining grinding material.

The aluminum sheet of the object to be painted was erected vertically and installed such that an upper end of the aluminum sheet was located <NUM> above the ground. Primer painting was performed to prevent corrosion of the object to be painted. For the primer painting, Uniepoc <NUM> Primer NC Red Rust Paint Liquid (produced by Nippon Paint) and Uniepoc <NUM> Primer Hardener (produced by Nippon Paint) were mixed at a weight ratio of <NUM>. The liquid mixture was adjusted to a viscosity appropriate for painting with a thinner, and was put into a pressurized container, the container was pressurized with air to pressure-feed the paint to the first discharge port of the flying object, so that the paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, water was sprayed from the second discharge port at a discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min. The time required for painting at this time was <NUM> seconds. Drying was performed naturally at room temperature for <NUM> hours.

For intermediate coat painting, NAX Mighty Rack G-IIKB type (produced by Nippon Paint) and NAX Mighty Rack G-IIKB type Hardener (produced by Nippon Paint) were mixed at a weight ratio of <NUM>. The liquid mixture was adjusted to an appropriate viscosity with NAX Mighty Rack G-II500 Standard Thinner, and the paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint flow rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, water was sprayed from the second discharge port at a flow rate of <NUM>/min with air at an air flow rate of <NUM>/min. The time required for painting at this time was <NUM> seconds. Drying was performed naturally at room temperature for <NUM> hours.

After the intermediate coat was dried, the surface was smoothed by performing polishing using #<NUM> abrasive paper until the film thickness reached approximately <NUM>.

For topcoat painting, NAX Mighty Rack G-IIKB type (produced by Nippon Paint) and NAX Mighty Rack G-IIKB type Hardener (manufactured by Nippon Paint), which are the same paints as the intermediate coat, were mixed at a weight ratio of <NUM>. The liquid mixture was adjusted to an appropriate viscosity with NAX Mighty Rack G-II500 Standard Thinner, and the paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint flow rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, water was sprayed from the second discharge port at a flow rate of <NUM>/min with air at an air flow rate of <NUM>/min. The time required for painting at this time was <NUM> seconds. Drying was performed naturally at room temperature for <NUM> hours. When the obtained paint film was visually checked, it was confirmed that the film had no irregularities, cracking, and peeling.

The paint film obtained by the above steps was evaluated for adhesion, impact resistance, and scratch hardness by the following method. Evaluation results are shown in <FIG>.

Incidentally, adhesion, impact resistance, and scratch hardness were evaluated also in Examples <NUM> to <NUM> and Comparative Examples <NUM> and <NUM> according to the same criteria as the following evaluation criteria.

The appearance of the paint film was evaluated as follows. In a visual inspection, a case where the paint film was glossy, had no defects, and was smooth was denoted by "○", a case where the paint film had low gloss, defects, or a rough surface was denoted by "△", and a case where the paint film had no gloss, had large defects and severe irregularities was denoted by "×".

The adhesion of the paint film to the aluminum sheet was evaluated as follows. First, cuts reaching the aluminum sheet were formed in a grid pattern on the paint film. Specifically, <NUM> linear cuts were formed in each of a longitudinal direction and a lateral direction using a cutter knife, so as to intersect each other. The linear cuts were formed at an interval of <NUM>. Accordingly, a total of <NUM><NUM> × <NUM> squares each surrounded by the cuts were formed on the paint film. In other words, the paint film was formed which was divided into <NUM> × <NUM> regions in a grid pattern by the linear cuts.

Next, cellophane tape was caused to adhere to the regions in a grid pattern on the paint film, and then the cellophane tape was pulled upward at once and peeled off. The work of adhering and peeling of the cellophane tape was repeated three times. As a result, the area of a peeled portion of the paint film in the regions divided in a grid pattern was visually calculated, and a ratio of the area of the peeled portion to the entire area of the regions in a grid pattern was calculated as a defect rate (peeling rate). The obtained defect rate (peeling rate) was used to determine whether or not adhesion was acceptable according to the following criteria. A case where the defect rate was <NUM>% was denoted by "○", a case where the defect rate was more than <NUM>% and less than <NUM>% was denoted by "△", and a case where the defect rate was <NUM>% or more was denoted by "×".

As described above, the obtained paint film was evaluated for appearance and adhesion. The evaluation results are shown in <FIG>.

In addition, also in Example <NUM>, the same evaluation is performed for each evaluation item, and the evaluation results are shown in <FIG>.

The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, water was sprayed from the second discharge port at <NUM>/min. As for others, a paint film was formed on the aluminum sheet in the same manner as in Example <NUM>.

The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, air was sprayed from the second discharge port at an air flow rate of <NUM>/min. As for others, a paint film was formed on the aluminum sheet in the same manner as in Example <NUM>.

The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, ethylene glycol was sprayed from the second discharge port at a discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min. As for others, a paint film was formed on the aluminum sheet in the same manner as in Example <NUM>.

The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, alumina particles were sprayed from the second discharge port at a discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min. As for others, a paint film was formed on the aluminum sheet in the same manner as in Example <NUM>.

The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, a <NUM> wt% slurry in which alumina particles were dispersed in water were sprayed from the second discharge port at a discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min. As for others, a paint film was formed on the aluminum sheet in the same manner as in Example <NUM>.

The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> of the flying object at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min so as to form a film thickness of approximately <NUM>. At this time, water was sprayed from the second discharge port at a discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min, and a horizontal angle and a vertical angle formed by the first discharge port and the second discharge port were set to <NUM>° and <NUM>°, respectively. As for others, a paint film was formed on the aluminum sheet in the same manner as in Example <NUM>.

A paint film was formed on the aluminum sheet in the same manner as in Example <NUM> except that a topcoat paint was put into a spray gun carrying a suction type paint cup of <NUM> under the flying object body, and that the paint cup is carried in the flying object.

A paint film was formed on the aluminum sheet in the same manner as in Example <NUM> except that the topcoat paint was changed to IHT7200 (produced by Axalta), which is a water paint.

The exterior wall of the railway vehicle <NUM> shown in <FIG> was used as an object <NUM> to be painted. As for others, a paint film was formed in the same manner as in Example <NUM>. The exterior wall of the railway vehicle <NUM> was made of aluminum. In such an exterior wall of the railway vehicle <NUM>, a paint film was formed on the side surface portion <NUM> in the same manner as in Example <NUM>. The railway vehicle <NUM> was used as a normal traveling vehicle in an in-house test facility for three months. In the railway vehicle <NUM> after use for three months, the paint films formed in regions A1 and A2 were evaluated for adhesion and scratch hardness in the same manner as in Example <NUM>.

The same aluminum sheet as the one used in Example <NUM> was used as an object to be painted, and a blasting process was performed on the aluminum sheet in the same manner as in Example <NUM>. In primer painting, intermediate coat painting, and topcoat painting, painting and drying were performed under the same conditions as in Example <NUM> except that a fluid was not discharged from the second discharge port. When the obtained paint film was visually checked, it was confirmed that there were many irregularities and partially non-glossy places.

The same aluminum sheet as the one used in Example <NUM> was used as an object to be painted, and a blasting process was performed on the aluminum sheet in the same manner as in Example <NUM>. Similarly to Comparative Example <NUM>, in primer painting, intermediate coat painting, and topcoat painting, a fluid was not discharged from the second discharge port. The paint was sprayed from the first discharge port having a nozzle diameter of <NUM> at a paint discharge rate of <NUM>/min with air at an air flow rate of <NUM>/min in a state where the flying object was capable of flying stably, so as to form a film thickness of approximately <NUM>. As for others, paining and drying were performed under the same conditions as in Example <NUM>.

The time required for painting was <NUM>,<NUM> seconds for the primer painting, <NUM>,<NUM> seconds for the intermediate coat painting, and <NUM>,<NUM> seconds for the topcoat painting, and a lot of time was required. In addition, when the obtained paint film was visually checked, irregularities and roughness were confirmed, and adhesion was reduced.

According to Examples <NUM> to <NUM>, in painting using the flying object, the time required for painting could be shortened, and a high-quality paint film could be obtained without depending on the type of paint and the type of a fluid by the flying object including the first discharge port to discharge the paint and the second discharge port to discharge the fluid having the same momentum in a direction opposite the first discharge port.

In addition, in Example <NUM>, when the appearance of the paint film on the exterior wall of the railway vehicle after use for three months was visually checked, no breakage such as cracking or peeling was confirmed.

On the other hand, in Comparative Example <NUM>, the flying object lacked flight stability since painting was performed without discharging a fluid from the second discharge port, and the light and shade of painting was generated since the first discharge port fluctuated, so that irregularities were generated and non-paintable places were generated to cause a problem in the formation of a paint film. In Comparative Example <NUM>, in order to make the flying object fly stably without discharging a fluid from the second discharge port, painting was performed while significantly reducing the paint discharge rate, and a lot of time was required for painting, and no defects were seen but irregularities or roughness was generated, thereby causing a problem in the formation of a paint film.

Incidentally, the present invention is also applicable to railway vehicles, construction machines, or buildings as an object to be painted, that require a scaffolding, etc. when a person performs painting, and that require a robot, moving the object to be painted, a large robot, etc. when the robot performs painting.

Further, the present invention is also applicable to the field of power generation equipment such as large solar power generation devices, solar power generation modules, wind power generators, or wind power generation modules to be used outdoors.

Claim 1:
A flying object (<NUM>) comprising:
a flying object body (<NUM>);
a blade (<NUM>) that enables the flying object body (<NUM>) to fly;
a paint ejection mechanism that ejects paint (<NUM>) in a first direction; and
a fluid ejection mechanism that ejects a fluid (<NUM>) in a second direction differing from the first direction by <NUM> degrees or more; wherein
a nozzle (<NUM>) is provided in a lower portion of the flying object body (<NUM>), wherein the paint ejection mechanism includes a first ejection port (<NUM>) provided at one end of the nozzle (<NUM>), and the fluid ejection mechanism includes a second ejection port provided at the other end of the nozzle,
characterized in that
a lower portion of the nozzle (<NUM>) is provided with a paint supply port (<NUM>) to which the paint (<NUM>) is to be supplied, a fluid supply port (<NUM>) to which the fluid (<NUM>) is to be supplied, a first gas supply port (<NUM>) to which a first gas is to be supplied to eject the paint (<NUM>) from the first ejection port (<NUM>), and a second gas supply port (<NUM>) to which a second gas is to be supplied to eject the fluid (<NUM>) from the second ejection port (<NUM>), and wherein
the lower portion of the nozzle (<NUM>) is provided with a paint supply container (<NUM>), a first compressor (<NUM>) for the paint (<NUM>), a fluid supply container (<NUM>), and a second compressor (<NUM>) for the fluid (<NUM>),
the paint (<NUM>) is to be transported from the paint supply container (<NUM>) to the paint supply port (<NUM>),
the first gas is to be transported from the first compressor (<NUM>) for the paint to the first gas supply port (<NUM>), the fluid (<NUM>) is to be transported from the fluid supply container (<NUM>) to the fluid supply port (<NUM>), and the second gas is to be transported from the second compressor (<NUM>) for the fluid (<NUM>) to the second gas supply port (<NUM>).