JP2022126950A - Coating device and coating system - Google Patents

Abstract

To enable coating with excellent coating efficiency while obtaining high convenience.SOLUTION: An air conditioner 30 includes: a first flow channel 31a to which compressed air is supplied from an air compressor 20; a nozzle 32 for decompressing the compressed air of the first flow channel and discharging the compressed air; a second flow channel 33a for making the compressed air discharged from the nozzle flow; a discharge port 33b for discharging compressed air of the second flow channel fed to an air delivery passage 16 of a spray gun 10; and an outside air suction port 33c for sucking outside air to the second flow passage by a flow of the compressed air discharged to the second flow channel from the nozzle, wherein the nozzle, the second flow channel and the outside air suction port are formed into such a shape as to decompress the compressed air discharged from the nozzle so that a pressure of the compressed air in the discharge port becomes a magnitude corresponding to a spray air pressure of the spray gun while setting a flow rate per unit time of the compressed air in the discharge port to be greater than a discharge amount per unit time of the compressed air in the nozzle by the compressed air from the nozzle and the outside air from the outside suction port.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coating apparatus and coating system.

Conventionally, a coating apparatus includes a spray gun that atomizes a liquid coating material such as paint by air discharge pressure and air volume, and an air supply source that supplies air to the spray gun. It is known that a coating material is sprayed with low-pressure, high-volume blowing air (Patent Documents 1 and 2 below).

Japanese Utility Model Laid-Open No. 6-64745 Japanese Utility Model Laid-Open No. 49-136867

By the way, in this type of coating apparatus, an electric blower is used as an air supply source. For example, when an electric blower is used, low-pressure, high-flow air is supplied from the electric blower to the spray gun through a pipe such as an air hose, thereby enabling coating with high coating efficiency. On the other hand, an electric blower discharges air at a lower pressure than an air compressor, and pressure loss occurs when the pipe is lengthened. Further, the electric blower uses a built-in electric motor as a driving source, and requires a power supply for supplying power to the electric motor. For this reason, when using an electric blower, some kind of power source is required near the workplace regardless of whether it is an existing power source in the workplace or a portable power source. Thus, in this coating apparatus, from the viewpoint of convenience, it is desirable to use an air compressor, which is more versatile than an electric blower, as an air supply source. However, when an air compressor is used, for example, in order to spray the coating material with a low blowing air pressure equivalent to that of an electric blower, the compressed air from the air compressor is decompressed by an air regulator or the like before spraying. It is necessary to supply the gun. For this reason, in this case, when the compressed air is adjusted to a low pressure comparable to that of the electric blower, the supply amount of the compressed air to the spray gun decreases, and the compression required by the spray gun is reduced. Since the air supply condition cannot be satisfied, it is difficult to improve the coating efficiency compared to the case of using an electric blower.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a coating apparatus and a coating system that enable coating with excellent coating efficiency while obtaining high convenience.

In order to achieve the above object, the present invention provides a spray gun for atomizing and spraying a coating material with compressed air supplied to an air delivery passage, an air compressor for discharging the compressed air, and a and an air regulator that adjusts the pressure and flow rate of the compressed air and supplies the adjusted compressed air to the air delivery path. The air regulator includes a first flow path to which the compressed air is supplied from the air compressor, a nozzle for decompressing and discharging the compressed air in the first flow path, and the compressed air discharged from the nozzle. a second flow path for inflowing air, a discharge port communicating with the air delivery path and discharging the compressed air of the second flow path sent to the air delivery path, and a discharge port from the nozzle to the second flow path. and an outside air intake port for sucking outside air into the second flow path by the flow of the compressed air. The nozzle, the second flow path, and the external air intake port are composed of the compressed air discharged from the nozzle to the second flow path and the external air sucked into the second flow path from the external air intake port. By increasing the flow rate of the compressed air per unit time at the discharge port to a level greater than the discharge rate of the compressed air per unit time at the nozzle, the pressure of the compressed air at the discharge port increases the pressure of the spray gun. It is characterized in that it is formed in a shape that decompresses the compressed air discharged from the nozzle so that the size thereof corresponds to the blowing air pressure.

Further, in order to achieve the above object, the present invention provides a spray gun for atomizing and spraying a coating material with compressed air supplied to an air delivery passage, an air compressor for discharging compressed air, and from the air compressor A painting apparatus comprising an air regulator that adjusts the pressure and flow rate of the supplied compressed air and supplies the adjusted compressed air to the air delivery path; and the compressed air discharged from the air compressor. and an unmanned mobile device that moves using the as a power source. The air regulator includes a first flow path to which the compressed air is supplied from the air compressor, a nozzle for decompressing and discharging the compressed air in the first flow path, and the compressed air discharged from the nozzle. a second flow path for inflowing air, a discharge port communicating with the air delivery path and discharging the compressed air of the second flow path sent to the air delivery path, and a discharge port from the nozzle to the second flow path. and an outside air intake port for sucking outside air into the second flow path by the flow of the compressed air. The nozzle, the second flow path, and the external air intake port are composed of the compressed air discharged from the nozzle to the second flow path and the external air sucked into the second flow path from the external air intake port. By increasing the flow rate of the compressed air per unit time at the discharge port to a level greater than the discharge rate of the compressed air per unit time at the nozzle, the pressure of the compressed air at the discharge port increases the pressure of the spray gun. The unmanned mobile equipment is characterized in that the spray gun is mounted on the unmanned mobile device, and is formed in a shape that decompresses the compressed air discharged from the nozzle so as to have a size corresponding to the spray air pressure.

Even if an air compressor is used as an air supply source, the coating apparatus according to the present invention can be compared with a conventional coating apparatus using an electric blower by interposing an air regulator between the air compressor and the spray gun. Similarly, low pressure and high flow rates of compressed air can be supplied to the spray gun. Therefore, this coating apparatus can reduce the particle size of the atomized coating material and reduce the rebounding of the coating material from the surface to be coated in the same manner as the conventional coating apparatus. Therefore, it is possible to perform coating with excellent coating efficiency.

Furthermore, the coating apparatus according to the present invention uses an air compressor as an air supply source, so that at least the spray gun and the air regulator need only be carried by the operator, unlike the conventional coating apparatus using an electric blower. Since the operator does not need to carry a heavy and bulky tool such as an electric blower, the burden on the operator can be reduced and the workability can be improved. Furthermore, the coating apparatus according to the present invention uses an air compressor as an air supply source, so that the piping connecting the air regulator and the air compressor is reduced compared to the conventional coating apparatus using an electric blower. Since it can be made longer than the pipe connecting the electric blower and the electric blower, the air compressor and its power supply can be installed at a place farther away from the spray gun than the electric blower and its power supply. Therefore, this coating apparatus can perform coating work even if there is no power supply near the work place. Moreover, since this coating apparatus uses an air compressor as an air supply source, there is no need to install bulky equipment such as an electric blower or a generator near the operator, unlike the conventional coating apparatus using an electric blower. Therefore, workability can be improved in narrow workshops or workshops with poor scaffolding. In addition, when the work place is in an explosion-proof area (for example, inside a gas tank, underground passage, airport, oil refinery, etc.), this coating equipment can use a power supply outside the explosion-proof area or use a portable type outside the explosion-proof area. A power supply can be installed, and compressed air from an air compressor outside the explosion-proof area or an explosion-proof air compressor can be used, so work in the explosion-proof area becomes possible. Furthermore, since the coating apparatus according to the present invention uses an air compressor as an air supply source, there is one air compressor and one existing power supply or one portable type power supply for supplying power to the air compressor. By providing a power source, the air compressor can supply compressed air to multiple spray guns.

Thus, the coating apparatus according to the present invention and the coating system including the coating apparatus can perform coating with excellent coating efficiency while obtaining high convenience.

FIG. 1 is an explanatory diagram illustrating a coating apparatus according to an embodiment. FIG. 2 is a partial cross-sectional view showing the spray gun and air conditioning section.

EMBODIMENT OF THE INVENTION Below, embodiment of the coating apparatus and coating system which concern on this invention is described in detail based on drawing. In addition, this invention is not limited by this embodiment.

[Embodiment]
One embodiment of a coating apparatus and a coating system according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

Reference numeral 1 shown in FIG. 1 indicates a coating apparatus of this embodiment. This coating apparatus 1 adjusts compressed air to a predetermined pressure and flow rate, and atomizes and sprays a liquid coating material such as paint with the adjusted compressed air. Specifically, in order to increase the coating efficiency of the coating material, the coating apparatus 1 reduces the pressure of the compressed air in the air supply source while increasing the flow rate of the compressed air per unit time after the pressure reduction. The coating material is atomized and sprayed with a large flow of low-pressure compressed air. Here, the low pressure indicates the level of the spraying air pressure in the technical field of the coating apparatus 1, and indicates a well-known pressure value in this technical field.

This coating apparatus 1 is supplied with a coating material and compressed air, and includes a spray gun 10 for atomizing and spraying the coating material with the supplied compressed air, and an air compressor 20 as an air supply source for discharging the compressed air. and an air adjuster 30 that adjusts the pressure and flow rate of the compressed air supplied from the air compressor 20 and supplies the adjusted compressed air to the spray gun 10 (FIG. 1). The coating apparatus 1 also has a storage container 41 in which the coating material is stored, and the coating material is supplied from the storage container 41 to the spray gun 10 (FIG. 1). It should be noted that the coating apparatus 1 can be connected to the spray gun 10 with a coating material supply device capable of pumping the coating material instead of the storage container 41 .

The spray gun 10 has a barrel 11 provided with a coating material spray mechanism (FIGS. 1 and 2). The barrel 11 is formed in a cylindrical shape with both ends opened, and the coating material is sprayed from the opening side of one end. The barrel 11 shown here is formed cylindrically.

The barrel 11 is provided with a cylindrical air pipe 12 for sending compressed air into its internal space (FIGS. 1 and 2). The air pipe 12 is branched from the barrel 11 like a branch pipe, and its internal space communicates with the internal space of the barrel 11 . The air pipe 12 has an open end branched from the barrel 11 . The air pipe 12 shown here is formed in a cylindrical shape. In the spray gun 10 , compressed air adjusted by the air regulator 30 is supplied to the inner space of the air pipe 12 , and the adjusted compressed air is sent to the inner space of the barrel 11 through the air pipe 12 .

Furthermore, the barrel 11 is provided with a first branch pipe 13 and a second branch pipe 14 that connect the storage container 41 (FIGS. 1 and 2). The first branch pipe 13 and the second branch pipe 14 are each branched from the barrel 11 and communicate their internal spaces with the internal space of the barrel 11 . Each of the first branch pipe 13 and the second branch pipe 14 has an open end at one end branched from the barrel 11 . The first branch pipe 13 and the second branch pipe 14 shown here are branched on the side opposite to the air supply pipe 12 when viewed from the barrel axis of the barrel 11 .

A storage container 41 is connected to the first branch pipe 13, and the coating material in the storage container 41 is introduced (FIGS. 1 and 2). On the other hand, one end of a flexible pipe 42 is connected to the second branch pipe 14 (FIGS. 1 and 2). The other end of the pipe 42 is connected to a space (inside room) in the storage container 41 above the liquid surface of the coating material, and the interior space of the barrel 11 communicates with the inside space of the storage container 41 . In the storage container 41, the compressed air in the internal space of the barrel 11 is supplied through the pipe 42 into the chamber, and the pressure in the chamber increases. Therefore, the coating material in the storage container 41 is fed into the first branch pipe 13 with the liquid surface being pressurized as the pressure inside the chamber increases.

The barrel 11 is a molded body made of a metal material or the like in which the air supply pipe 12, the first branch pipe 13, and the second branch pipe 14 are integrated.

The barrel 11 is provided with the following spray mechanism.

The interior space of the barrel 11 is provided with a coating material delivery pipe 51 that communicates with the interior space of the first branch pipe 13 and allows the coating material in the storage container 41 to flow through the first branch pipe 13 (FIG. 2). . The coating material delivery pipe 51 is formed in a cylindrical shape with both ends opened and arranged coaxially in the internal space of the barrel 11 .

Further, in the interior space of the barrel 11, a first ejection nozzle 52 for ejecting the coating material delivered from the coating material delivery pipe 51 from the ejection port at the tip of the conical nozzle, and the ejection of the first ejection nozzle 52 A needle valve 53 is provided to open and close the outlet (FIGS. 1 and 2). The first ejection nozzle 52 is attached to an opening at one end of the coating material delivery pipe 51 . The needle valve 53 is coaxially accommodated in the inner space of the coating material delivery pipe 51, and is relatively moved in the axial direction in this inner space to open and close the ejection port of the first ejection nozzle 52. As shown in FIG. A valve guide 54 for movably holding the needle valve 53 is assembled to the opening at the other end of the barrel 11 (FIG. 2).

In this spray gun 10, the needle valve 53 is assembled in a normally closed state in which the ejection port of the first ejection nozzle 52 is always closed. Therefore, in the spray gun 10, in order to keep the needle valve 53 in the normally closed state, an elastic force is applied to the needle valve 53 in one axial direction (close direction) to cause the needle valve 53 to emit the first jet. An elastic member 55 is provided to close the ejection port of the nozzle 52 (FIG. 2). The elastic member 55 shown here is a so-called coiled spring. The elastic member 55 applies a force to the needle valve 53 to move it in the other axial direction (opening direction). , the needle valve 53 is normally closed again.

A trigger 56 for moving the needle valve 53 in the opening direction is assembled to the barrel 11 (FIGS. 1 and 2). The trigger 56 is an operation lever inserted through the inside and outside of the barrel 11 and can be rotated around a rotation shaft 56a arranged in the inner space of the barrel 11. As shown in FIG. In the spray gun 10 , when the trigger 56 is pulled, the normally closed needle valve 53 is guided by the valve guide 54 to move in the opening direction, thereby opening the ejection port of the first ejection nozzle 52 . Accordingly, in the spray gun 10 , the coating material delivered from the coating material delivery pipe 51 can be ejected from the ejection port of the first ejection nozzle 52 . In the spray gun 10, when the trigger 56 is stopped being pulled, the elastic member 55 pushes the needle valve 53 in the closing direction. to block the ejection port of the first ejection nozzle 52 .

Further, the opening at one end of the barrel 11 is provided with a second jetting nozzle 15 for jetting out the compressed air from its internal space (FIGS. 1 and 2). The second ejection nozzle 15 may be formed by forming one end of the barrel 11 into a nozzle shape, or may be a separate part assembled to the opening of this one end. The second ejection nozzle 15 shown here is one end of the barrel 11 formed into a nozzle shape.

Here, in the internal space of the barrel 11, there are cross sections between the inner wall surface of the barrel 11 and the outer wall surface of the coating material delivery pipe 51 and between the inner wall surface of the barrel 11 and the outer wall surface of the first ejection nozzle 52. An annular space is formed. In this spray gun 10, the space is used as an air delivery path 16 (Figs. 1 and 2). The air delivery path 16 is a path for delivering the compressed air supplied from the air supply pipe 12 toward the second ejection nozzle 15 .

An on-off valve 57 is assembled in the internal space of the barrel 11 to open and close the space between the internal space of the air supply pipe 12 and the air delivery path 16 (FIG. 2). The on-off valve 57 is assembled in a normally closed state in which the gap therebetween is always closed. Therefore, in the spray gun 10, in order to keep the open/close valve 57 in a normally closed state, the open/close valve 57 is given an elastic force in one axial direction (close direction), and the open/close valve 57 is closed by the air pipe. An elastic member 58 is provided to close the space between the internal space of 12 and the air delivery path 16 (FIG. 2). The elastic member 58 shown here is a so-called coiled spring. The elastic member 58 applies a force to the on-off valve 57 to move it in the other axial direction (opening direction). , the on-off valve 57 is brought back to the normally closed state. In the spray gun 10, when the trigger 56 is pulled, the normally closed on-off valve 57 moves in the opening direction in conjunction with the opening operation of the needle valve 53, thereby opening the inner space of the air supply pipe 12 and the air delivery path. 16 is opened. In the spray gun 10, when the trigger 56 is stopped being pulled, the elastic member 58 pushes the on-off valve 57 in the closing direction, so that the on-off valve 57 moves in the closing direction, 12 and the air delivery path 16 are closed.

The spray gun 10 includes a coating material delivery pipe 51, a first ejection nozzle 52, a needle valve 53, a valve guide 54, an elastic member 55, a trigger 56, a second ejection nozzle 15, an air delivery passage 16, an on-off valve 57 and an elastic member. A member 58 constitutes a major part of the construction of the spray mechanism. In the spray gun 10 , the compressed air in the air supply pipe 12 is sent into the internal space of the barrel 11 by opening the needle valve 53 and the open/close valve 57 together with the operation of pulling the trigger 56 . The compressed air sent into the internal space of the barrel 11 is directed to the second ejection nozzle 15 through the air delivery path 16 and sent to the storage container 41 through the pipe 42 . Therefore, in the spray gun 10, the compressed air supplied to the air delivery passage 16 is blown out from the second ejection nozzle 15 at high speed, and the high-speed compressed air sprays the coating material ejected from the first ejection nozzle 52. atomized and sprayed.

Incidentally, in the spray gun 10, the air pipe 12 also serves as a gun grip. Therefore, in the spray gun 10, the air pipe 12 is covered with a grip 59 from the outside, for example, in order to increase the stability when held by hand (Fig. 2). This gripper 59 is molded from a synthetic resin material.

The air compressor 20 is a so-called electric air compressor, and discharges compressed air at a predetermined discharge pressure. In this coating apparatus 1, an air compressor 20 capable of discharging compressed air having a width of 0.2 MPa to 0.7 MPa, or compressed air of any pressure between 0.2 MPa and 0.7 MPa An air compressor 20 capable of discharging is used. The air compressor 20 discharges compressed air to a flexible pipe 61 (FIG. 1) to which one end is connected, and to an air regulator 30 to which the other end of the pipe 61 is connected. supply. The pipe 61 is a so-called air hose.

The air regulator 30 adjusts the compressed air supplied from the air compressor 20 to a predetermined pressure and flow rate, and supplies the adjusted compressed air to the air delivery path 16 of the spray gun 10 . Specifically, the air regulator 30 reduces the pressure of the compressed air supplied from the air compressor 20 to a level corresponding to the spraying air pressure of the spray gun 10, and the flow rate of the compressed air after this pressure reduction per unit time is increased from the amount of compressed air supplied from the air compressor 20 per unit time. The air regulator 30 supplies low-pressure compressed air whose flow rate per unit time is amplified to the air delivery path 16 of the spray gun 10 . The air regulator 30 shown here adjusts the pressure of the compressed air supplied to the air delivery path 16 to any pressure between 0.02 MPa and 0.05 MPa, and adjusts the pressure of the compressed air supplied to the air delivery path 16 every time. Adjust the flow to anywhere between 100 L and 2,000 L min. The air regulator 30 in a specific example to be described later reduces the pressure of 0.5 MPa compressed air supplied from the air compressor 20 to 0.035 MPa and increases the flow rate to 1000 L per minute.

The air regulator 30 has a first flow path 31a to which compressed air is supplied from the air compressor 20 (FIGS. 1 and 2). The air conditioner 30 shown here has a cylindrical air introduction member 31 with both ends opened, and the columnar internal space of the air introduction member 31 is used as a first flow path 31a (Fig. 2). The air introducing member 31 shown here is formed in a cylindrical shape using a synthetic resin material (for example, engineering plastic) having high heat resistance and high strength. The pipe 61 is connected to one end of the air introduction member 31, and feeds the compressed air discharged from the air compressor 20 into the cylindrical first flow path 31a.

The air conditioner 30 also includes a nozzle 32 that reduces the pressure of the compressed air in the first flow path 31a and discharges it (FIGS. 1 and 2). The nozzle 32 reduces the flow rate of the compressed air in the first flow path 31a and discharges it, thereby reducing the pressure of the discharged compressed air below the pressure of the compressed air in the first flow path 31a. The nozzle 32 is formed in a cylindrical shape with one end open and the opening area of the other end narrower than this opening, and one end of the nozzle 32 is coaxially connected to the other end of the air introduction member 31 . be. The nozzle 32 allows the compressed air of the first flow path 31a to flow in from one end side, and discharges the compressed air from the opening at the other end.

The nozzle 32 shown here has a cylindrical main body 32a on one end side connected to the other end of the air introduction member 31, and a cone-shaped nozzle tip 32b on the other end side. (Fig. 2). In this nozzle 32, the compressed air in the first flow path 31a is supplied to the inner space of the nozzle tip 32b through the inner space of the main body 32a, and the supplied compressed air in the first flow path 31a is supplied to the nozzle tip. The liquid is discharged from the discharge port _32b1 at the tip of 32b. The discharge port _32b1 is formed as a circular through hole. In this nozzle 32, the other end of the air introducing member 31 is inserted from the opening at one end (opening of the main body 32a), and the other end of the air introducing member 31 is inserted into the inner wall of this one end (the inner wall of the main body 32a). is inserted or screwed.

The air regulator 30 also has a second flow path 33a into which the compressed air discharged from the nozzle 32 flows, and a second flow path that communicates with the air delivery path 16 of the spray gun 10 and feeds the air into the air delivery path 16. and a discharge port 33b for discharging the compressed air of 33a (FIGS. 1 and 2). Further, the air conditioner 30 is provided with an outside air intake port 33c for sucking outside air into the second flow path 33a by means of the flow of compressed air discharged from the nozzle 32 to the second flow path 33a (FIGS. 1 and 2). . The air conditioner 30 has a filter 34 at its outside air inlet 33c so as not to suck dust together with the outside air. For the filter 34, for example, a laminate of non-woven fabric having a low external air suction resistance may be used.

The air conditioner 30 shown here has a cylindrical air lead-out member 33 with both ends opened. (Fig. 2). The air lead-out member 33 is molded using the same synthetic resin material as the air lead-in member 31 . In this air lead-out member 33, the columnar internal space is used as the second flow path 33a. In the air lead-out member 33, the nozzle 32 connected to one end of the air lead-out member 33 discharges compressed air to the second flow path 33a, and the compressed air of the second flow path 33a is discharged from the opening of the other end. . Therefore, in this air lead-out member 33, the opening at the other end is used as a discharge port 33b. Further, in the air lead-out member 33, a through-hole is formed in the peripheral wall for communicating the inside and the outside, and this through-hole is used as an outside air intake port 33c. At least one outside air intake port 33c is provided.

Further, the air lead-out member 33 shown here includes a first cylindrical portion 33d on the one end side which is formed in a cylindrical shape, and an outer diameter smaller than that of the first cylindrical portion 33d coaxially with the first cylindrical portion 33d. It has a second cylindrical portion 33e on the other end side formed in a cylindrical shape having the same inner diameter as the first cylindrical portion 33d (FIG. 2). In the air lead-out member 33, the columnar internal spaces of the first cylindrical portion 33d and the second cylindrical portion 33e are used as the second flow paths 33a, and the first cylindrical portion 33d and the second cylindrical portion 33e of the second cylindrical portion 33e The opening at the opposite end is used as a discharge port 33b. In the air lead-out member 33, a through-hole used as an outside air intake port 33c is formed in the peripheral wall of the first cylindrical portion 33d.

One end of the air lead-out member 33 is coaxially connected to the nozzle 32 in which the nozzle tip 32b and the main body 32a are inserted from the opening in this order. Therefore, the nozzle tip portion 32b can discharge the compressed air in the _first flow path 31a from the discharge port 32b1 at the tip to the second flow path 33a. In the air lead-out member 33, the nozzle 32 is inserted from an opening on one end side of the first cylindrical portion 33d, and the main body 32a of the nozzle 32 is fitted or screwed to the inner wall on the one end side of the first cylindrical portion 33d. ing. For this reason, the inner diameter of the first cylindrical portion 33d on the one end side is formed to match the outer diameter of the main body 32a.

In the air lead-out member 33, compressed air is discharged from the discharge port _32b1 of the nozzle tip portion 32b to the second flow passage 33a, thereby generating a negative pressure around the nozzle tip portion 32b and generating an external air intake port 33c. outside air of atmospheric pressure is sucked into the second flow path 33a. For this reason, it is desirable that the outside air intake port 33c is arranged to face the outer wall surface of the nozzle tip portion 32b in the direction perpendicular to the axis of the nozzle tip portion 32b in order to increase the efficiency of sucking the outside air.

The air lead-out member 33 is inserted into the internal space of the air pipe 12 from the side of the discharge port 33 b so as to have the discharge port 33 b inside the internal space of the air pipe 12 and is coaxially connected to the air pipe 12 . Therefore, the air lead-out member 33 can discharge the compressed air in the second flow path 33a into the internal space of the air pipe 12 from the discharge port 33b. In the air supply pipe 12 shown here, the air lead-out member 33 is inserted from the opening at the end in the order of the second cylindrical portion 33e and the first cylindrical portion 33d, and the first cylindrical portion 33d is fitted or inserted into the inner wall of the end. screwed on. That is, the air regulator 30 shown here is directly connected to the spray gun 10 . The connected portion of the air regulator 30 is connected to the connecting portion of the spray gun 10 while the discharge port 33b is included in the spray gun 10. As shown in FIG. Here, the first cylindrical portion 33d of the air lead-out member 33 is used as the connected portion of the air adjuster 30 for directly connecting the air adjuster 30 to the spray gun 10. The end of the air pipe 12 is used as the connection of the spray gun 10 to which the device 30 is directly connected.

In this air conditioner 30, the nozzle 32, the second flow path 33a, and the outside air intake port 33c are configured to suck the compressed air discharged from the nozzle 32 into the second flow path 33a and the outside air intake port 33c into the second flow path 33a. The pressure of the compressed air at the discharge port 33b increases the flow rate per unit time of the compressed air at the discharge port 33b more than the discharge quantity per unit time of the compressed air at the nozzle 32, and the pressure of the compressed air at the discharge port 33b increases to the spray gun. It is formed in a shape that decompresses the compressed air discharged from the nozzle 32 so as to have a size corresponding to the blowing air pressure of the nozzle 32 . Specifically, the nozzle 32, the second flow path 33a, and the outside air intake port 33c are composed of the compressed air discharged from the nozzle 32 to the second flow path 33a and the external air sucked into the second flow path 33a from the outside air intake port 33c. Depending on the air, the compressed air at the discharge port 33b can be adjusted to a pressure between 0.02 MPa and 0.05 MPa, and the compressed air at the discharge port 33b can be adjusted to a pressure of 100 L to 2,000 L per minute. It is formed with a shape that can be adjusted to provide a flow rate anywhere in between. Here, the nozzle 32, the second flow path 33a, and the outside air intake port 33c are formed in the following shapes so that the adjusted compressed air is obtained at the discharge port 33b.

In the nozzle 32, the shape of the nozzle tip portion 32b is determined so that the adjusted compressed air is formed at the discharge port 33b. The nozzle tip portion 32b has a conical cylindrical shape with an acute taper angle, and has a conical internal space with an acute taper angle. The nozzle tip portion 32b has such an acute-angled cone-shaped internal space that moderates the flow of the compressed air from the _first flow path 31a toward the discharge port 32b1, thereby reducing the flow resistance of the compressed air. to reduce losses. Furthermore, in this nozzle tip portion 32b, the discharge port 32b1 at the tip has a diameter between _1.5 mm and 2.5 mm, taking into account the ease with which external air is drawn in from the external air intake port 33c. It is formed as a circular through hole. The specific exemplary nozzle tip 32b shown here has a conical cylindrical shape with a taper angle of 60 degrees, and has a conical inner space with a taper angle of 60 degrees. A specific example of the discharge port 32b1 shown here is formed as a circular through hole with _a diameter of 1.9 mm.

In addition, the second flow path 33a is formed in a columnar flow path with a diameter between 5 mm and 8 mm so as to facilitate the intake of external air from the external air intake port 33c. The second flow path 33a shown here as a specific example is formed as a cylindrical flow path with a diameter of 6.7 mm.

The number and opening area of the external air intake ports 33c are determined according to the amount of external air to be drawn in per unit time required to amplify the flow rate of the compressed air discharged from the nozzle 32 with the external air. The outside air intake port 33c shown here has an opening area of 200 mm ² , and three of them are arranged around the axis so as to face the outer wall surface of the nozzle tip portion 32b.

Here, the second flow path 33a may be formed as a cylindrical flow path having the same diameter from the position of the ejection port _32b1 of the nozzle 32 to the ejection port 33b at the other end. In order to reduce or eliminate the pressure difference of the compressed air before and after the air supply pipe 12 and the air delivery path 16, the flow of the compressed air is made uniform, and the spray pattern of the coating material is stabilized. It may be formed into a shape. For example, the _second flow path 33a includes _a cylindrical flow path 33a1 on the nozzle 32 side and a truncated conical shape with the end of the cylindrical flow path 33a1 as the upper base and the discharge port 33b as the lower base. It may have a shape having a base channel 33a2 (FIG. ₂ ). The second flow path 33a shown here includes a cylindrical flow path 33a ₁ having a diameter between 5 mm and 8 mm (diameter 6.7 mm in the specific example shown here). and a truncated conical flow path _33a2 having _a truncated cone shape with the end of 33a1 as the upper base and the circular discharge port 33b with a diameter of 12 mm as the lower base.

The air regulator 30 has an on-off valve 35 for opening and closing the first flow path 31a in the air introduction member 31 (FIGS. 1 and 2). The on-off valve 35 shown here includes a spherical valve element 35a having _a communication passage 35a1 capable of communicating with the first flow path 31a when the valve is open, and the valve element 35a in an open state and a closed state. (FIG. 2).

As described above, in the coating apparatus 1 of the present embodiment, even if the air compressor 20 is used as the air supply source, the air regulator 30 can be interposed between the air compressor 20 and the spray gun 10. Therefore, it is possible to supply the spray gun 10 with low-pressure and high-flow compressed air in the same manner as in a conventional coating apparatus using an electric blower. Therefore, the coating apparatus 1 can reduce the particle size of the atomized coating material and reduce the rebounding of the coating material from the surface to be coated, like the conventional coating apparatus. Therefore, it is possible to perform coating with excellent coating efficiency.

Here, in a conventional coating apparatus using an electric blower, the operator wears the electric blower on his or her back or on his shoulder. However, since the coating apparatus 1 of this embodiment uses the air compressor 20 as an air supply source, it is sufficient for the operator to carry at least the spray gun 10 and the air regulator 30. Since there is no need for the operator to carry a heavy and bulky tool such as an electric blower, the burden on the operator can be reduced and workability can be improved. Therefore, the coating apparatus 1 is more convenient than conventional coating apparatuses using an electric blower.

Incidentally, the air regulator 30 may be built in the spray gun 10 . Even in this case, the coating apparatus 1 can reduce the burden on the operator and improve the workability as compared with the conventional coating apparatus using an electric blower, so that the convenience is high.

Furthermore, in a conventional coating apparatus using an electric blower, if the operator does not wear the electric blower, it is necessary to place the electric blower near the operator due to the low discharge pressure of the electric blower. . For this reason, in this conventional coating apparatus, considering the voltage drop due to the long power cord, a power source for the electric blower is required in the workshop. A portable power supply must be brought into the workshop. On the other hand, the coating apparatus 1 of the present embodiment uses the air compressor 20 as an air supply source, so that the piping connecting the air regulator 30 and the air compressor 20 is reduced compared to the conventional coating apparatus using an electric blower. Since the length 61 can be made longer than the pipe connecting the spray gun and the electric blower, the air compressor 20 can be installed at a place farther away from the spray gun 10 than the electric blower. In addition, the coating apparatus 1 can use an existing power supply at a location distant from the spray gun 10 as a power supply (power supply for the air compressor 20) as compared with a conventional coating apparatus using an electric blower. Alternatively, a power source such as a portable generator can be installed at a location remote from the spray gun 10 . Therefore, the coating apparatus 1 can perform coating work even if there is no power supply near the work place. In addition, by using the air compressor 20 as an air supply source, the coating apparatus 1 can install bulky equipment such as an electric blower and a generator near the operator as in a conventional coating apparatus using an electric blower. Since there is no need to do so, workability can be improved in narrow workshops or workshops with poor scaffolding. In addition, this coating apparatus 1 can use a power supply outside the explosion-proof area or can be moved outside the explosion-proof area when the work area is an explosion-proof area (for example, inside a gas tank, an underground passage, an airport, an oil refinery, etc.). can be installed, and compressed air from the air compressor 20 outside the explosion-proof area or from the explosion-proof air compressor 20 can be used, making it possible to work in the explosion-proof area. Thus, the coating apparatus 1 is more convenient than conventional coating apparatuses using an electric blower.

Furthermore, since the coating apparatus 1 of the present embodiment uses the air compressor 20 as an air supply source, there is one air compressor 20 and one existing power supply or one power supply for supplying power to the air compressor 20 Compressed air can be supplied from the air compressor 20 to a plurality of spray guns 10 by providing a portable power source. In other words, the coating apparatus 1 can simultaneously use a plurality of spray guns 10 by using one air compressor 20 and one existing power supply or one portable power supply for supplying power to the air compressor 20. become. On the other hand, in a conventional coating apparatus using an electric blower, when a plurality of spray guns 10 are used, an electric blower for each spray gun 10 and a power supply for each electric blower are required. Therefore, the coating apparatus 1 of this embodiment is more convenient than a conventional coating apparatus using an electric blower.

Furthermore, the coating apparatus 1 of this embodiment may interpose another flexible pipe (not shown) between the spray gun 10 and the air regulator 30 . That is, the air regulator 30 may be connected to the spray gun 10 via a flexible pipe that sends the compressed air in the second flow path 33a discharged from the discharge port 33b to the air delivery line 16. As a result, the coating apparatus 1 requires only the spray gun 10 to be carried by the operator, thereby further reducing the burden on the operator and improving workability.

Furthermore, the coating apparatus 1 of this embodiment adjusts the pressure of the compressed air discharged from the air compressor 20 between the air compressor 20 and the air regulator 30, A pressure regulator (not shown) for supplying to the 1 flow path 31a may be provided. The pressure regulator is assembled to the air introduction member 31, for example.

Furthermore, in the coating apparatus 1 of the present embodiment, a warm air generator (not shown) such as a heater capable of heating the compressed air discharged from the air compressor 20 is provided between the air compressor 20 and the air regulator 30. ) may be provided. As a result, the coating apparatus 1 can accelerate the drying of the sprayed coating material.

Here, the coating apparatus 1 of the present embodiment may constitute a coating system together with an unmanned mobile device (not shown) that moves using the compressed air discharged from the air compressor 20 as a power source. The unmanned mobile device is a device to be controlled that can be remotely controlled and unmanned to an object to be coated or a coating location. For example, the unmanned mobile device may be an unmanned aircraft that moves on air routes, an unmanned land mobile device that moves on land routes, an unmanned wall mobile device that moves along walls, and the like. The unmanned land transport machine and the unmanned wall transport machine, for example, may move the surface to be coated along a guide rail or the like, or move the surface to be coated using wheels, a steering device, or the like. may A spray gun 10 or a spray gun 10 and an air regulator 30 are mounted on this unmanned mobile device. This coating system is provided with a control device (not shown) for controlling at least the spraying from the spray gun 10 and the stopping of the spraying. A control device for driving and controlling an unmanned mobile device may be used as the control device.

This coating system can obtain the same effect as that of the coating apparatus 1 . Since this coating system uses the compressed air discharged from the air compressor 20 of the coating apparatus 1 as a power source for the unmanned mobile equipment, it is possible to reduce the weight of the unmanned mobile equipment. In addition, since this painting system does not use an electric motor or a combustion engine as a power source for the unmanned mobile equipment, it is possible to work in an explosion-proof area. In addition, this coating system enables high-place work at a higher position than when an operator operates the spray gun 10 . Since this coating system does not require the operator to be near the spray gun 10, it is possible to prevent the sprayed coating material from scattering to the operator. Therefore, in this coating system, it is not necessary to provide the coating apparatus 1 with a mechanism for suppressing the scattering of the coating material, or the mechanism can be simplified, and a highly volatile coating material can be used. enable

As described above, the coating apparatus 1 and the coating system of the present embodiment can perform coating with excellent coating efficiency while obtaining high convenience.

Reference Signs List 1 coating device 10 spray gun 16 air delivery path 20 air compressor 30 air regulator 31a first flow path 32 nozzle 32b nozzle tip 32b ₁ discharge port (circular through hole)
33a Second flow path 33b Discharge port 33c External air intake port

Claims (6)

a spray gun for atomizing and spraying the coating material with compressed air supplied to the air delivery path;
an air compressor for discharging compressed air;
an air regulator that adjusts the pressure and flow rate of the compressed air supplied from the air compressor and supplies the adjusted compressed air to the air delivery path;
with
The air conditioner is
a first flow path to which the compressed air is supplied from the air compressor;
a nozzle for depressurizing and discharging the compressed air in the first flow path;
a second flow path into which the compressed air discharged from the nozzle flows;
a discharge port that communicates with the air delivery path and discharges the compressed air of the second flow path that is fed into the air delivery path;
an outside air intake port for sucking outside air into the second flow path by the flow of the compressed air discharged from the nozzle to the second flow path;
with
The nozzle, the second flow path, and the external air inlet are formed by the compressed air discharged from the nozzle to the second flow path and the external air sucked into the second flow path from the external air inlet. and increasing the flow rate of the compressed air at the discharge port per unit time more than the discharge rate of the compressed air at the nozzle per unit time, and increasing the pressure of the compressed air at the discharge port to the spray air of the spray gun. A coating apparatus characterized by being formed in a shape for decompressing the compressed air discharged from the nozzle so as to have a size corresponding to the pressure. The nozzle, the second flow path, and the external air inlet are formed by the compressed air discharged from the nozzle to the second flow path and the external air sucked into the second flow path from the external air inlet. , the compressed air at the outlet is adjustable to a pressure anywhere between 0.02 MPa and 0.05 MPa, and the compressed air at the outlet is between 100 L and 2,000 L/min. 2. The coating apparatus according to claim 1, wherein the coating apparatus is formed in a shape that can be adjusted so that the flow rate is any one of the following. The nozzle has a conical cylindrical shape with an acute taper angle, and has a nozzle tip portion in which a conical inner space with an acute taper angle is formed,
The nozzle tip has a circular tip with a diameter between 1.5 mm and 2.5 mm for discharging the compressed air of the first flow path supplied to the internal space to the second flow path. having a through hole,
3. A coating apparatus according to claim 2, wherein said second flow path is formed as a cylindrical flow path having a diameter between 5 mm and 8 mm. The air conditioner has a connected portion that connects the discharge port to the connection portion of the spray gun while the discharge port is included in the spray gun, or the second flow path discharged from the discharge port has the 4. A coating apparatus according to claim 1, 2 or 3, wherein said spray gun is connected to said spray gun via a flexible pipe for sending compressed air to said air delivery path, or said spray gun is built in said spray gun. A pressure regulator between the air compressor and the air regulator for regulating the pressure of the compressed air discharged from the air compressor and for supplying the regulated compressed air to the first flow path. 5. The coating apparatus according to any one of claims 1 to 4, characterized by comprising: A spray gun that atomizes and sprays the coating material with compressed air supplied to the air delivery path, an air compressor that discharges the compressed air, and the pressure and flow rate of the compressed air supplied from the air compressor are adjusted. a coating apparatus comprising an air regulator for supplying the adjusted compressed air to the air delivery path;
an unmanned mobile device that moves using the compressed air discharged from the air compressor as a power source;
with
The air conditioner is
a first flow path to which the compressed air is supplied from the air compressor;
a nozzle for depressurizing and discharging the compressed air in the first flow path;
a second flow path into which the compressed air discharged from the nozzle flows;
a discharge port that communicates with the air delivery path and discharges the compressed air of the second flow path that is fed into the air delivery path;
an outside air intake port for sucking outside air into the second flow path by the flow of the compressed air discharged from the nozzle to the second flow path;
with
The nozzle, the second flow path, and the external air inlet are formed by the compressed air discharged from the nozzle to the second flow path and the external air sucked into the second flow path from the external air inlet. and increasing the flow rate of the compressed air at the discharge port per unit time more than the discharge rate of the compressed air at the nozzle per unit time, and increasing the pressure of the compressed air at the discharge port to the spray air of the spray gun. formed in a shape that decompresses the compressed air discharged from the nozzle so as to have a size corresponding to the pressure,
A coating system, wherein the spray gun is mounted on the unmanned mobile device.

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