JP7416373B2 - Self-propelled paint sprayer and painting method - Google Patents

Description

The present invention relates to a self-propelled coating machine and a coating method.

When repainting walls and roofs of large structures such as factory buildings, a coating film generation process is carried out. In coating film generation, a coating film is generated on a painted surface, for example, by spraying a coating liquid. Normally, the process of creating a paint film is carried out by hand by workers on scaffolding, but especially when the painted surface is located at a high place, the amount of work involved in assembling and dismantling the scaffolding becomes enormous, and the painting itself In many cases, the amount of work exceeded the amount of work required.

Regarding this point, Patent Document 1 and Patent Document 2 describe that painting can be performed using a flying aircraft having rotary wings. By using a flying aircraft to perform painting, there is no need for scaffolding for workers to stand on, and the enormous amount of work required to assemble and dismantle scaffolding can be reduced. However, these documents do not mention the specific process of painting, such as the formation of the coating film mentioned above, and therefore, based on the descriptions in these documents, it is possible to develop a painting process that uses an airplane and does not require scaffolding. It is not realistic to realize this.

JP 2017-171032 Publication JP2017-39334A

For example, as a practical problem when painting using a self-propelled aircraft including an airplane, it is necessary to prevent the sprayed coating liquid from scattering to the surrounding area. From the perspective of preventing scattering, it is preferable to use a low pressure when spraying the coating liquid, but in this case, the airflow generated by the propeller may affect the jet flow of the coating liquid, and the coating film formed on the painted surface may be disturbed. There is. As described above, it is not easy to achieve both the prevention of coating liquid scattering and the quality of the coating film, but the above-mentioned Patent Documents 1 and 2 do not mention this point.

Therefore, the present invention has developed a self-propelled paint sprayer that uses an air thrust device to easily move the paint sprayer to any working position, and that can both prevent the sprayed coating fluid from scattering and improve the quality of the paint film. The purpose is to provide a coating machine and a coating method.

According to an aspect of the present invention, a self-propelled paint sprayer includes an air thrust device, a spray nozzle forming a spray opening outside the operating area of the air thrust device, and a spray nozzle for applying a coating liquid to the spray nozzle at a pressure of 1 MPa or less. The contact frame includes a supply means for supplying, and a contact frame that extends beyond the spray port and contacts the work surface on which the spray nozzle sprays the coating liquid.
According to the above configuration, the coating liquid is supplied to the spray nozzle at a low pressure of 1 MPa or less to prevent the coating liquid from scattering, and the spray port is formed on the outside of the air thrust device, so that the airflow can be applied to the coating liquid. The quality of the coating can be improved by reducing the impact on the jet flow and by maintaining the distance between the working surface and the spray nozzle using a contact frame.

The above self-propelled paint sprayer may further include wheels that contact the work surface, and the contact frame may contact the work surface via the wheels.
Providing wheels that contact the work surface facilitates moving the self-propelled sprayer along the work surface while maintaining the distance between the work surface and the spray nozzle.

In the above case, the wheels may be formed of elastic members. Alternatively, the self-propelled paint sprayer may further include a resilient member interposed between the contact frame and the wheels.
By forming the wheels with an elastic member or interposing an elastic member between the contact frame and the wheels, it is possible to absorb the shock received from the work surface when, for example, a self-propelled paint sprayer shakes. can.

The painting method using the self-propelled paint sprayer described above involves the process of moving the self-propelled paint sprayer close to the work surface using the thrust generated by the air thrust device, and the process of moving the self-propelled paint sprayer to the vicinity of the work surface by the thrust generated by the air thrust device, and the process of moving the self-propelled paint sprayer to the vicinity of the work surface by contacting the contact frame with the work surface. the self-propelled paint sprayer is moved along the work surface by the thrust generated by the pneumatic thrust device. including.
The ability of the self-propelled paint sprayer to fly and move close to the work surface using the thrust generated by the air thrust device eliminates the need for scaffolding, even when the work surface is located at an elevated location. The ability of the self-propelled paint sprayer to fly along the work surface makes it easier to deal with obstacles and irregularities on the work surface.

As explained above, according to the present invention, by using an air thrust device, a coating machine can be easily moved to any working position, and at the same time, it is possible to prevent the sprayed coating liquid from scattering and to improve the quality of the coating film. be able to.

1 is a diagram showing the configuration of a coating system including a self-propelled coating machine according to an embodiment of the present invention. FIG. 2 is a plan view of the self-propelled paint sprayer shown in FIG. 1;

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that, in this specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals and redundant explanation will be omitted.

As shown in FIG. 1 , the painting system 1 includes a self-propelled paint sprayer 10 and a fixed location unit 20 . The self-propelled paint sprayer 10 includes a propeller 11 which is an example of an air thrust device, a spray nozzle 12 forming a spray port 121 directed toward a work surface W, and a supply means for supplying a coating liquid containing paint to the spray nozzle 12. A contact frame 14 that contacts the work surface W is provided. As shown in FIG. 2, the propellers 11 (propellers 11A to 11D) of the self-propelled paint sprayer 10 constitute a multi-rotor, and are used to move the self-propelled paint sprayer 10 up, down, forward, backward, and turn. generates thrust. Here, as illustrated, in this embodiment, the blowing port 121 formed by the blowing nozzle 12 is located outside the operating region R of the propeller 11. Thereby, the influence of the airflow generated by the propeller 11 on the jet flow of the coating liquid can be reduced.

The spray nozzle 12 is provided with a communication pipe that communicates between the fixed arrangement unit 20 and the self-propelled atomizer 10, through which the coating liquid is sent out using the pressure pump 22 from the coating liquid tank 21 included in the fixed arrangement unit 20. 23 and supply piping 13. Here, the supply pipe 13 supplies the coating liquid to the spray nozzle 12 at a pressure of 1 MPa or less. In the case of general spray painting of walls without using a self-propelled paint machine, the pressure at which the coating liquid is supplied is about 200 MPa, so the pressure at which the coating liquid is supplied in this embodiment is lower than that in the general case. The pressure is low. By supplying the coating liquid to the spray nozzle 12 at such a low pressure, it is possible to prevent the coating liquid from scattering. By supplying the coating liquid at a low pressure, it is also possible to effectively utilize a mechanism (not shown) that prevents the coating liquid from scattering by, for example, generating an air curtain from the vicinity of the spray port 121 of the spray nozzle 12. can. The lower limit of the pressure at which the coating liquid is supplied to the spray nozzle 12 is not particularly limited, but may be set to 0.1 MPa or higher, for example, in order to avoid the influence of the airflow generated by the propeller 11.

The contact frame 14 maintains the distance d between the spray port 121 and the work surface W shown in FIG. 2 by extending beyond the spray port 121 of the spray nozzle 12 and contacting the work surface W. As described above, in this embodiment, the coating liquid is supplied to the spray nozzle 12 at low pressure, but in this case, the quality of the coating film formed on the work surface W by spraying the coating liquid is greatly influenced by the distance d. Ru. In other words, if the distance d fluctuates greatly, it is difficult to stabilize the quality of the coating film. In this embodiment, by maintaining the distance d using the contact frame 14, the quality of the coating film can be stably improved.

Further, in the illustrated example, the self-propelled paint sprayer 10 includes a wheel 15 that is attached to the tip of the contact frame 14 and contacts the work surface W, and an elastic member 16 that is interposed between the contact frame 14 and the wheel 15. Equipped with. In this case, the contact frame 14 contacts the work surface W via the wheels 15. For example, the axis of rotation of the wheels 15 is oriented to rotate as the self-propelled paint sprayer 10 moves up and down along the work surface W. This facilitates, for example, raising the self-propelled paint sprayer 10 along the work surface W while maintaining the distance d using the contact frame 14.

In addition, by interposing the elastic member 16 between the contact frame 14 and the wheel 15, it is possible to perform work when, for example, the wheel 15 is brought into contact with the work surface W for the first time or when the self-propelled paint sprayer 10 shakes. The impact received from the surface W can be absorbed. Similar effects can be obtained by forming the wheels 15 from an elastic member while arranging the elastic member 16 or instead of arranging the elastic member 16.

In the painting method using the self-propelled paint sprayer 10 as described above, the self-propelled paint sprayer 10 is separated from the work surface W by a predetermined distance in the vicinity of the work surface W, specifically, by the thrust generated by the propeller 11. the contact frame 14 contacts the work surface W to maintain the spray port 121 at a predetermined distance d from the work surface W, and the supply pipe 13 supplies the coating liquid to the spray nozzle 12. and a step of moving the self-propelled paint sprayer 10 along the work surface W by the thrust generated by the propeller 11. Through these processes, even if the work surface W is located at a high place, a coating film can be applied to a predetermined area of the work surface W without using scaffolding and while dealing with obstacles and unevenness on the work surface W. can be formed.

Next, examples of the present invention will be described. In this embodiment, the self-propelled paint sprayer 10 described above is moved to the vicinity of the work surface W, which is a wall surface formed of a steel plate, by the thrust generated by the propeller 11, and then the contact frame 14 is moved to the work surface W. The spray port 121 was maintained at a position 20 cm from the work surface W by contacting the work surface W. In this state, the coating liquid was supplied from the supply pipe 13 to the spray nozzle 12 at a pressure of 0.6 MPa to 1.4 MPa. While spraying the coating liquid onto the work surface W from the spray nozzle 12, the self-propelled paint sprayer 10 is moved upward along a predetermined area of the work surface W at a speed of 0.4 m/s by the thrust generated by the propeller 11. The process was repeated twice. The results are shown in Table 1.

In Cases 1 to 3, by supplying the coating liquid to the spray nozzle 12 at a pressure of 0.6 MPa to 1.0 MPa, the coating efficiency of the coating liquid was 80% or more, and a coating film with a thickness of 90 μm was obtained. We were able to form the product with high quality. On the other hand, in Cases 4 and 5, when the coating liquid was supplied to the spray nozzle 12 at a pressure exceeding 1.0 MPa, the coating efficiency was less than 80%, and the coating film thickness was insufficient, resulting in poor quality. I couldn't get it.

From this result, if the self-propelled paint sprayer 10 can spray the coating liquid by bringing the contact frame 14 into contact with the work surface W and maintaining the distance of the spray port 121 from the work surface W, the coating liquid It has been found that the quality of the coating film is also improved by supplying the coating liquid to the spray nozzle 12 at a pressure of 1 MPa or less, which prevents the scattering of the coating liquid.

In addition, in the above embodiment, the self-propelled coating machine 10 was used for painting the work surface W formed of a steel plate, but the self-propelled coating machine 10 can be used on the work surface W made of various materials such as a concrete surface. Is possible. The work surface W does not necessarily have to be a wall surface, but may be a roof surface, a ceiling surface, or the like.

Although preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person with ordinary knowledge in the technical field to which the present invention pertains can come up with various modifications or modifications within the scope of the technical idea stated in the claims. It is understood that these also naturally fall within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1... Painting system, 10... Self-propelled paint machine, 11... Propeller, 12... Spraying nozzle, 121... Spraying port, 13... Supply piping, 14... Contact frame, 15... Wheel, 16... Elastic member, 20... Fixed arrangement Unit, 21... Coating liquid tank, 22... Pressure pump, 23... Communication pipe, R... Operating area, W... Working surface, d... Distance.

Claims (6)

an air thrust device;
a blowing nozzle forming a blowing port outside the operating area of the air thrust device;
Supply means for supplying the coating liquid to the spray nozzle at a pressure of 0.1 MPa or more and 1 MPa or less;
a contact frame that extends beyond the spray nozzle and is arranged to contact the work surface on which the spray nozzle sprays the coating liquid and maintain a distance between the spray nozzle and the work surface; Propulsion type paint machine. further comprising wheels that contact the work surface,
The self-propelled paint sprayer of claim 1, wherein the contact frame contacts the work surface via the wheels. The self-propelled paint sprayer according to claim 2, wherein the wheels are formed of an elastic member. The self-propelled paint machine according to claim 2 or 3, further comprising an elastic member interposed between the contact frame and the wheel. The self-propelled paint machine according to any one of claims 1 to 4, further comprising a mechanism that generates an air curtain from the vicinity of the spray nozzle. A coating method using the self-propelled coating machine according to any one of claims 1 to 5 ,
moving the self-propelled paint sprayer to the vicinity of the work surface using thrust generated by the air thrust device;
maintaining the spray nozzle at a predetermined distance from the work surface by the contact frame contacting the work surface;
a step in which the supply means supplies the coating liquid to the spray nozzle;
moving the self-propelled paint sprayer along the work surface by thrust generated by the air thrust device.

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