JP2005034704A - Painting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To wash a rotary atomization head without using a dedicated washing means with regard to a coating apparatus fitted with a coating gun having the rotary atomization head. <P>SOLUTION: In the coating apparatus, an ejection opening 12 opens toward the peripheral edge 11a of the rotary atomization head 11, and a washing liquid supply means B for supplying the washing liquid is connected to a supply passage 21 for shaping air in the coating gun A. After coating, the washing liquid is supplied to the supply passage 21 in a body 10. When the washing liquid is sprayed from the ejection opening 12 to the peripheral edge 11a of the rotary atomization head 11, a coating adherent to the peripheral edge 11a is removed. Since the washing liquid is supplied and ejected by using the supply passage 21 and the ejection opening 12, a dedicated washing apparatus is unnecessary. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating apparatus provided with a coating gun having a rotary atomizing head.
[0002]
[Prior art]
A coating gun having a rotary atomizing head at the tip is provided with an outlet for ejecting shaping air along the outer peripheral edge of the rotary atomizing head. The paint discharged in an atomized form from the outer peripheral edge of the rotary atomizing head is formed into a predetermined pattern while being converged to the center by shaping air, and is applied to the object to be coated. In addition, as a coating gun having a rotary atomizing head, there is one disclosed in Patent Document 1.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-216567
[Problems to be solved by the invention]
Part of the atomized paint floats in the vicinity of the rotary atomizing head without being applied to the workpiece, so that the floating atomized paint stays in the rotary atomizing head while painting is continued for a long time. It is unavoidable that it adheres to the outer periphery. If the adhered paint accumulates, it may become a paint lump called “butsu” and fly toward the object to be coated.
[0005]
Therefore, conventionally, a dedicated cleaning device is regularly used, and the cleaning device is moved to the vicinity of the rotary atomizing head to spray the cleaning liquid on the outer peripheral edge of the rotary atomizing head to remove the attached paint. However, the use of such a dedicated cleaning apparatus is not only costly, but also has a problem that it takes time to change the setup between the cleaning process and the painting process.
The present invention has been made in view of the above circumstances, and has an object to allow the rotary atomizing head to be cleaned without using a dedicated cleaning means.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, the atomizing paint is sprayed onto the front end portion from the outer peripheral edge in a radial manner, and the atomized paint discharged from the rotary atomizing head is sprayed onto the atomized paint in a predetermined shape. A coating device provided with a spray gun for jetting shaping air to be molded into the spray gun, wherein the jet port is opened in a direction toward the outer peripheral edge of the rotary atomizing head, A cleaning liquid supply means for supplying a cleaning liquid was connected to a shaping air supply path provided inside the coating gun.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention, the jet port is disposed behind the outer peripheral edge of the rotary atomizing head and at a position separated from the outer peripheral surface of the rotary atomizing head. In the present invention, the outer peripheral edge of the outlet is configured to protrude forward from the inner peripheral edge.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the jet outlet is configured to continuously open over the entire circumference.
[0008]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the supply path provided in the coating gun includes a plurality of spiral flow paths having a spiral shape substantially concentric with the rotation center of the rotary atomizing head. It was set as the structure provided at intervals in the circumferential direction.
According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the supply path includes an annular annular flow path that is continuous with the entire front end of the spiral flow path and the rear end of the jet outlet. It was set as the structure provided.
[0009]
According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the cross-sectional area perpendicular to the rotation center of the rotary atomizing head in the annular flow path gradually decreases from the spiral flow path side toward the jet outlet side. The configuration is as follows.
A seventh aspect of the present invention is the structure according to any one of the fourth to sixth aspects, wherein the spiral direction of the cleaning liquid ejected from the ejection port is opposite to the rotational direction of the rotary atomizing head. It was.
[0010]
Operation and effect of the invention
[Invention of Claim 1]
After painting, when the cleaning liquid is supplied to the shaping air supply passage in the body and the cleaning liquid is sprayed from the jet port to the outer peripheral edge of the rotary atomizing head, the paint adhering to the outer peripheral edge is removed. Since the cleaning liquid is supplied and ejected by using the shaping air supply passage and the jet outlet, a dedicated cleaning device is not required.
[0011]
[Invention of claim 2]
When the jet outlet is located behind the outer peripheral edge of the rotary atomizing head and is disposed at a position separated from the outer peripheral surface of the rotary atomizing head, an ejection path for shaping air along the opening direction of the jet outlet; Since the space between the outer peripheral surface of the rotary atomizing head becomes negative pressure, the atomized paint may be drawn into the negative pressure space and adhere to the outer peripheral surface of the rotary atomizing head.
However, according to the present invention, the outer peripheral edge of the jet outlet is projected forward from the inner peripheral edge, so that a part of the cleaning liquid is ejected by shaping air along the opening direction of the jet outlet. The area that can be cleaned is expanded because it goes to the inner side, that is, the outer peripheral side of the rotary atomizing head.
[0012]
[Invention of claim 3]
Since a jet nozzle is a form which opens continuously over the perimeter, a uniform cleaning effect is acquired over the perimeter.
[Invention of claim 4]
The cleaning liquid supplied to the supply path passes through the plurality of spiral flow paths and is sent to the jet outlet while accumulating circumferential rotational force. The plurality of cleaning liquid flows that have passed through the plurality of spiral flow channels are mixed while reaching the jet outlet to become a uniform spiral cleaning liquid flow in the circumferential direction, and are ejected from the jet outlet while maintaining a uniform spiral flow state. To do.
[0013]
[Invention of claim 5]
Since the plurality of cleaning liquid flows that have passed through the spiral flow path are mixed in the process of moving in the annular flow path before reaching the jet outlet, they become a uniform spiral cleaning liquid flow in the circumferential direction. High uniformity when doing.
[Invention of claim 6]
Since the cross-sectional area of the flow path of the cleaning liquid gradually decreases while flowing through the annular flow path, the flow speed of the cleaning liquid is accelerated and the cleaning effect by the cleaning liquid is enhanced.
[Invention of Claim 7]
After coating, if the cleaning liquid is continuously sprayed on the outer peripheral edge of the rotary atomizing head, a brake effect for suppressing the rotation of the rotary atomizing head can be obtained, so that a dedicated air brake mechanism becomes unnecessary.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
A first embodiment of the present invention will be described below with reference to FIGS.
The coating apparatus of the present embodiment is configured to include a coating gun A and a cleaning liquid supply means B, and a cleaning liquid supply for supplying a cleaning liquid to a shaping air supply path 21 provided in the coating gun A is provided. Means B is connected.
The coating gun A includes a rotary atomizing head 11 and a circular slit-shaped jet nozzle 12 provided along the outer peripheral edge 11a of the rotary atomizing head 11 at the front end portion (left end portion in FIG. 1) of the body 10. Is provided. In the body 10, a cylindrical fixed shaft 13 extending in the front-rear direction is provided in a rotationally restricted state, and a paint pipe 14 elongated in the front-rear direction is coaxial with the fixed shaft 13 at the front end portion of the fixed shaft 13. And it is fixed in a form protruding forward from the fixed shaft 13. The coating gun A is connected to a paint supply source (not shown), and the liquid paint pumped from the paint supply source passes through the fixed shaft 13 and is supplied to the paint pipe 14.
[0015]
A rotating shaft 15 having a cylindrical shape concentric with the fixed shaft 13 is rotatably supported on the outer periphery of the fixed shaft 13, and the rotating shaft 15 rotates at high speed by blowing turbine air to a turbine blade 16 provided on the outer periphery of the rotating shaft 15. It is designed to be driven. The rotation direction of the rotary atomizing head 11 is a counterclockwise direction toward the front, that is, a counterclockwise direction. A rotary atomizing head 11 having a cup shape that is concentric with the rotary shaft 15 and opened forward is attached to the front end portion of the rotary shaft 15 so as to rotate integrally. A storage chamber 17 is formed inside the rotary atomizing head 11, and a front end portion of the paint pipe 14 faces in the storage chamber 17. A concentric circular dish-shaped recess 18 is formed on the front surface of the rotary atomizing head 11, and the inner periphery of the recess 18 is a tapered surface 19 whose diameter is increased toward the front. In addition, a plurality of small-diameter communication holes 20 penetrating from the outer periphery of the storage chamber 17 to the tapered surface 19 are formed in the partition partitioning the recess 18 and the storage chamber 17 at intervals in the circumferential direction.
[0016]
When the liquid paint is supplied to the paint pipe 14 with the rotary atomizing head 11 rotated at a high speed, the liquid paint is dropped into the storage chamber 17 from the front end of the paint pipe 14 and passes through the communication hole 20 by centrifugal force. The taper surface 19 is sent to the taper surface 19 and moved forward by the centrifugal force, and is atomized from the outer peripheral edge of the taper surface 19 (rotating atomizing head 11) to be discharged radially. .
A supply path 21 for supplying the shaping air and the cleaning liquid to the ejection port 12 is provided in the body 10. The rear end portion of the supply path 21 reaches a port 22 at the rear end portion of the body 10, and an air supply source 24 is connected to the port 22 via a hose 23. On the other hand, the front end of the supply path 21 is a spout 12. The front end portion of the supply path 21 has a cylindrical air cap 25 that is concentric with the rotary atomizing head 11 on the inner and outer circumferences, and a circular shape that is concentric with the rotary atomizing head 11 on the inner and outer circumferences. It consists of two parts, a cylindrical air guide 26. The air cap 25 constitutes the outer periphery of the front end of the body 10 and is fixed to the body 10 so as not to rotate. The air guide 26 is fixedly provided in the hollow of the air cap 25.
[0017]
A tapered inner peripheral surface 27 that decreases in diameter toward the front is formed at the inner peripheral front end of the air cap 25, and the inner diameter is constant in the front-rear direction at the rear end of the tapered inner peripheral surface 27. The constant-diameter inner peripheral surface 28 is continuous. The inner diameter of the constant diameter inner peripheral surface 28 is the same as the inner diameter of the rear end of the tapered inner peripheral surface 27. Further, at the rear end of the constant diameter inner peripheral surface 28, an enlarged inner peripheral surface 29 having an inner diameter larger than that of the constant diameter inner peripheral surface 28 and having a constant inner diameter in the front-rear direction is formed in a step shape.
[0018]
A tapered outer peripheral surface 30 that is reduced in diameter toward the front and has the same gradient as the tapered inner peripheral surface 27 is formed at the outer peripheral front end of the air guide 26. In the front-rear direction, the front end of the tapered outer peripheral surface 30 is substantially at the same position as the front end of the tapered inner peripheral surface 27, but the rear end of the tapered outer peripheral surface 30 is more forward than the rear end of the tapered inner peripheral surface 27. To position. A constant-diameter outer peripheral surface 31 having a constant outer diameter in the front-rear direction is connected to the rear end of the tapered outer peripheral surface 30. The inner diameter of the constant diameter outer peripheral surface 31 is the same as the inner diameter of the rear end of the tapered outer peripheral surface 30 and is smaller than the constant diameter inner peripheral surface 28. In the front-rear direction, the rear end of the constant diameter outer peripheral surface 31 is at the same position as the front end of the constant diameter inner peripheral surface 28 (that is, the rear end of the tapered inner peripheral surface 27).
[0019]
At the rear end of the constant diameter outer peripheral surface 31, an enlarged outer peripheral surface 32 having an outer diameter equal to or slightly smaller than the inner diameter of the constant diameter outer peripheral surface 31 and having a constant outer diameter in the front-rear direction is formed in a step shape. Is formed. In the front-rear direction, the rear end of the enlarged diameter outer peripheral surface 32 is at the same position as the rear end of the constant diameter inner peripheral surface 28. In other words, the enlarged outer peripheral surface 32 and the constant diameter inner peripheral surface 28 are in the same range. It has become. A plurality of spiral grooves 33 having a concentric spiral shape with the rotary atomizing head 11 are formed on the enlarged diameter outer peripheral surface 32 at regular intervals (at a constant pitch) in the circumferential direction. In the present embodiment, the cross-sectional shape of the spiral groove 33 is a semicircular shape. The cross-sectional shape of the spiral groove 33 is not limited to a semicircular shape, and may be any shape such as a square, a triangle, and a trapezoid.
[0020]
Further, a reduced diameter outer peripheral surface 34 having an outer diameter smaller than the outer diameter of the enlarged outer peripheral surface 32 and a constant outer diameter in the front-rear direction is formed in a stepped manner at the rear end of the enlarged outer peripheral surface 32. ing. In the front-rear direction, the rear end of the reduced diameter outer peripheral surface 34 is at the same position as the rear end of the enlarged diameter inner peripheral surface 29. In other words, the reduced diameter outer peripheral surface 34 and the expanded inner peripheral surface 29 have the same formation region. It has become. The reduced diameter outer peripheral surface 34 is formed with a flange portion 35 that is concentrically expanded from the center position in the front-rear direction and whose outer diameter is smaller than the inner diameter of the expanded inner peripheral surface 29.
[0021]
The following space is formed between the air cap 25 and the air guide 26. First, between the front end side region of the tapered inner peripheral surface 27 and the tapered outer peripheral surface 30, a narrow slit 36 that is continuous over the entire circumference is formed, and the opening at the front end of the slit 36 is the coating gun A. This is a circular spout 12 that continuously opens over the entire circumference at the front end. The position of the jet nozzle 12 in the front-rear direction is the outer peripheral edge 11a of the rotary atomizing head 11 (that is, the outer peripheral edge of the tapered surface 19, and the liquid paint is atomized and discharged radially outward). Is set backwards. Moreover, the position of the jet nozzle 12 is a position spaced radially outward with respect to the outer peripheral edge 11 a of the rotary atomizing head 11. The opening direction of the spout 12, that is, the inclination direction of the tapered inner peripheral surface 27 and the tapered outer peripheral surface 30 is such that the shaping air ejected therefrom is directed to the outer peripheral edge 11 a of the rotary atomizing head 11, It is set as the direction which hits the periphery 11a from diagonally outside rear. Further, of the edges constituting the ring-shaped opening 12, the outer peripheral edge 12 a (the front end of the tapered inner peripheral surface 27 of the air cap 25) is the inner peripheral edge 12 b (air guide). 26, the front end of the tapered outer peripheral surface 30).
[0022]
Between the taper-shaped inner peripheral surface 27 and the constant-diameter outer peripheral surface 31, a circular annular channel 37 that is continuous over the entire circumference is formed. Since the peripheral surface on the outer peripheral side constituting the annular flow path 37, that is, the tapered inner peripheral surface 27 is reduced in diameter toward the front, it is perpendicular to the rotation center of the rotary atomizing head 11 in the annular flow path 37. The cross-sectional area gradually decreases from the rear (spiral channel 38 side) to the front (jet port 12 side).
Between the constant-diameter inner peripheral surface 28 and the enlarged-diameter outer peripheral surface 32, a plurality of spiral flow paths 38 formed by the constant-diameter inner peripheral surface 28 and the spiral groove 33 are formed at regular intervals in the circumferential direction. ing. The front end of the spiral channel 38 communicates with the annular channel 37. Further, the spiral direction of the spiral flow path 38 is a direction that is displaced in the clockwise direction toward the front (that is, clockwise).
[0023]
A circular annular chamber 39 that is continuous over the entire circumference is formed between the enlarged inner peripheral surface 29 and the reduced outer peripheral surface 34. The annular chamber 39 is divided into two front and rear chambers by the flange portion 35, and air can flow between the two chambers through a gap between the outer periphery of the flange portion 35 and the enlarged inner peripheral surface 29. All the spiral channels 38 communicate with each other at the front end of the annular chamber 39. In addition, the rear end of the annular chamber 39 is decentered in the radial direction with respect to the rotation center of the rotary atomizing head 11 and via an eccentric hole 40 extending in the front-rear direction provided at a position radially outward from the rotation shaft 15. It communicates with the port 22. That is, the supply path 21 is configured by the eccentric hole 40, the annular chamber 39, the spiral flow path 38, the annular flow path 37, the slit 36, and the ejection port 12.
[0024]
Next, the cleaning liquid supply means B will be described.
The cleaning liquid supply means B is for supplying a cleaning liquid (for example, thinner) to the shaping air supply path 21 in the body 10. A branch passage 41 is connected in the middle of the hose 23 connecting the coating gun A and the air supply source 24, and a normally closed check valve 42 is connected in the middle of the branch passage 41. Is connected to a tank 43 for storing the cleaning liquid. When pilot air is supplied to the check valve 42 from the pilot air pressure supply source 44, the check valve 42 is opened. Further, when pressurized air is pumped from the pressurized air supply source 45 to the tank 43 to pressurize the tank 43, the cleaning liquid stored in the tank 43 is moved to the check valve 42 side by the air pressure. It is designed to be pumped.
[0025]
Next, the operation of this embodiment will be described.
When painting, the liquid paint is atomized from the outer peripheral edge 11a of the rotary atomizing head 11 and released, and the check valve 42 is kept in the closed state from the air supply source 24 in the painting gun A. The air is pumped to the supply path 21. The pumped air sequentially passes through the eccentric hole 40, the annular chamber 39, the spiral channel 38, the annular channel 37, and the slit 36, and obliquely forward from the jet port 12 toward the outer peripheral edge 11a of the rotary atomizing head 11. It is ejected as shaping air. Then, the atomized paint released from the outer peripheral edge 11a of the rotary atomizing head 11 is shaped into a pattern of a predetermined shape while being converged by being blown with shaping air simultaneously with the release, and is applied to an object to be coated (not shown). Painted.
[0026]
Here, the shaping air will be described. The air supplied to the supply path 21 is sent into the annular flow path 37 in a state where the rotational force in the circumferential direction is accumulated by passing through the plurality of spiral flow paths 38. In the annular channel 37, the plurality of spiral flows formed by passing through the spiral channels 38 are mixed with each other while accumulating the rotational force in the circumferential direction, so that the density is uniform in the circumferential direction. The spiral air flow passes through the slit 36 and reaches the spout 12. And it ejects as shaping air from the jet nozzle 12, maintaining the state of a uniform spiral flow. Thereby, the atomization coating material discharge | released from the rotary atomization head 11 is shape | molded by the uniform pattern over the perimeter. Further, it is avoided that the particle diameter of the atomized paint is nonuniform due to nonuniformity of the shaping air spraying in the circumferential direction.
[0027]
In addition, since the cross-sectional area perpendicular to the rotation center of the rotary atomizing head 11 in the annular flow path 37 gradually decreases from the spiral flow path 38 side toward the jet outlet 12 side, The air flow rate is accelerated. Thereby, the flow velocity of the shaping air is increased.
In addition, since the jetting air 12 is opened in a direction in which the shaping air ejected therefrom hits the outer peripheral edge 11a of the rotary atomizing head 11, the atomized paint discharged from the outer peripheral edge 11a of the rotary atomizing head 11 is At the same time as the release, it is shaped by shaping air. Thereby, the particle diameter of the atomized paint can be made uniform, and the molding efficiency by shaping air can be improved.
[0028]
In addition, since the spiral direction of the shaping air ejected from the ejection port 12 and the rotation direction of the rotary atomizing head 11 are opposite to each other, the radiation direction of the atomized paint discharged from the rotary atomizing head 11, The ejection direction of the shaping air with respect to the atomized paint is opposite to each other in the circumferential direction. Therefore, the relative blowing speed of the shaping air to the atomized paint is increased, and the molding efficiency is excellent.
Further, the shaping air is blown in the spiral direction toward the outer peripheral edge 11 a of the rotary atomizing head 11, and the direction of the spiral of the shaping air to be blown is opposite to the rotation direction of the rotary atomizing head 11. The brake which suppresses rotation of the rotary atomizing head 11 by continuing to blow shaping air on the outer peripheral edge 11a of the rotary atomizing head 11 for a predetermined time even after finishing painting. Since an effect is obtained, a dedicated air brake mechanism is not required.
[0029]
Further, the spout 12 is disposed behind the outer peripheral edge 11a of the rotary atomizing head 11 and at a position spaced outward from the outer peripheral surface of the rotary atomizing head 11, in this case, A substantially triangular shape formed between an ejection path of shaping air along the opening direction of the jet nozzle 12 (that is, directed to the outer peripheral edge 11a of the rotary atomizing head 11) and the outer peripheral surface of the front end portion of the rotary atomizing head 11. Since the space of the cross section becomes negative pressure, there is a concern that the atomized paint is drawn into the negative pressure space and adheres to the outer peripheral surface of the front end portion of the rotary atomizing head 11. However, in this embodiment, since the outer peripheral edge 12a of the jet nozzle 12 is projected forward from the inner peripheral edge 12b, a part of the shaping air is along the opening direction of the jet nozzle 12. Further, since the air travels toward the inner side of the shaping air ejection path, that is, toward the outer peripheral side of the front end portion of the rotary atomizing head 11, there is no possibility that the space becomes negative pressure.
[0030]
In addition, since the atomized paint released from the rotary atomizing head 11 draws a spiral, it wraps around the back side of the object to be coated and is also applied to the back side, so that the coating efficiency is good.
Now, when cleaning the outer peripheral edge 11a of the front end portion of the rotary atomizing head 11, the check valve 42 is opened and the cleaning liquid in the tank 43 is pumped to the check valve 42 side. Then, in the coating gun A, the cleaning liquid is supplied to the supply path 21 which is a flow path of the shaping air, and the cleaning liquid is sprayed from the jet port 12 to the outer peripheral edge 11a of the rotary atomizing head 11, thereby rotating the atomization. The paint adhering to the outer peripheral edge 11a of the front end portion of the head 11 is removed. As described above, since the cleaning liquid is supplied and ejected by using the supply passage 21 for the shaping air and the ejection port 12, a dedicated cleaning device is unnecessary.
[0031]
Also, in the unlikely event, between the ejection path of shaping air along the opening direction of the ejection port 12 (a path directed from the ejection port 12 to the outer peripheral edge 11a of the rotary atomizing head 11) and the outer peripheral surface of the rotary atomizing head 11 In this embodiment, the adhering paint is removed even if the space becomes negative pressure and the atomized paint drawn into the negative pressure space adheres to the outer peripheral surface of the front end portion of the rotary atomizing head 11. Can be done. That is, in this embodiment, since the edge 12a on the outer peripheral side of the spout 12 is configured to protrude forward from the edge 12b on the inner peripheral side, a part of the cleaning liquid is along the opening direction of the spout 12. In addition to the shaping air ejection path, that is, toward the outer peripheral area behind the outer peripheral front end edge of the rotary atomizing head 11, the washable area is expanded, and the paint adhering to this area is surely washed off. Can do.
[0032]
Moreover, since the jet nozzle 12 is a form which opens continuously over the perimeter as mentioned above, a uniform cleaning effect is acquired over the perimeter.
Further, the cleaning liquid supplied to the supply passage 21 is sent to the ejection port 12 in a state where the rotational force in the circumferential direction is accumulated by passing through the plurality of spiral flow paths 38, but the plurality of liquids that have passed through the plurality of spiral flow paths 38. The cleaning liquid flow becomes a spiral cleaning liquid flow that is made uniform in the circumferential direction by being mixed while reaching the jet outlet 12, and is thus ejected from the jet outlet 12 while maintaining a uniform spiral flow state. A uniform cleaning effect can be obtained.
[0033]
In addition, the plurality of cleaning liquid flows that have passed through the spiral flow path 38 are mixed in the process of moving through the annular flow path 37 before reaching the jet outlet 12, thereby forming a spiral cleaning liquid flow that is uniform in the circumferential direction. The uniformity when ejected from the ejection port 12 is further increased.
In addition, as described above, the cross-sectional area perpendicular to the rotation center of the rotary atomizing head 11 in the annular flow path 37 gradually decreases from the spiral flow path 38 side toward the jet outlet 12 side. While flowing through 37, the flow rate of the cleaning liquid is accelerated, and the cleaning effect of the cleaning liquid is enhanced.
[0034]
In addition, as described above, the spiral direction of the cleaning liquid ejected from the ejection port 12 is opposite to the rotational direction of the rotary atomizing head 11, and therefore the cleaning liquid is applied to the outer peripheral edge 11 a of the rotary atomizing head 11 after painting. As a result, the braking effect of suppressing the rotation of the rotary atomizing head 11 can be obtained. Therefore, a dedicated air brake mechanism is not required.
[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
[0035]
(1) In the above-described embodiment, the spout is formed in a slit shape that continuously opens over the entire circumference. However, according to the present invention, the spout is configured by a plurality of openings arranged at intervals in the circumferential direction. May be. In this case, each opening may have a circular shape or an arc shape concentric with the rotary atomizing head.
(2) In the above-described embodiment, the spiral direction of the cleaning liquid ejected from the ejection port is opposite to the rotational direction of the rotary atomizing head. However, according to the present invention, the spiral direction of the cleaning liquid is the rotational direction of the rotary atomizing head. It is good also as the same direction as a rotation direction.
[0036]
(3) In the above embodiment, the spiral flow path is formed on the outer periphery of the air guide. However, according to the present invention, it may be formed on the inner periphery of the air cap. You may form in both.
(4) In the above embodiment, the annular flow path clearly defined from the slit communicating with the ejection port is provided, but according to the present invention, such an annular flow path may not be provided. In this case, you may make it a slit become narrow gradually toward the front.
[0037]
(5) In the above embodiment, the outer peripheral surface of the annular flow path is tapered. However, according to the present invention, the outer peripheral surface of the annular flow path may have a constant diameter in the front-rear direction.
(6) In the above embodiment, the outer peripheral edge of the jet port is projected forward from the inner peripheral edge. However, according to the present invention, the outer peripheral edge of the jet port is the inner edge. Form that does not protrude forward from the edge on the peripheral side, that is, the form in which both the inner and outer edges are in the same position in the front-rear direction, or the form in which the inner peripheral edge protrudes forward from the outer peripheral edge It is good.
[0038]
(7) In the above embodiment, the cross-sectional area perpendicular to the rotation center of the rotary atomizing head in the annular flow path gradually decreases from the spiral flow path side toward the jet outlet side. The area may remain constant, or the cross-sectional area may gradually increase from the spiral channel side toward the jet port side.
[Brief description of the drawings]
1 is a cross-sectional view of a front end portion of a body in Embodiment 1. FIG. 2 is a partially cutaway side view showing a shaping air supply path. FIG. 3 is a partially enlarged cross-sectional view of a front end portion of a body. Partial enlarged cross-sectional view showing the flow path [Explanation of symbols]
A ... Coating gun B ... Cleaning liquid supply means 11 ... Rotating atomizing head 11a ... Outer peripheral edge 12 of rotating atomizing head ... Spout 21 ... Supply channel 37 ... Annular channel 38 ... Spiral channel

Claims (7)

A rotary atomizing head that discharges the paint radially from the outer periphery to the front end, and shaping air for forming the atomized paint into a predetermined shape by being sprayed to the atomized paint discharged from the rotary atomizing head A coating device provided with a coating gun provided with a spout for ejecting
The spout is opened in a direction toward the outer periphery of the rotary atomizing head;
A coating apparatus, wherein a cleaning liquid supply means for supplying a cleaning liquid is connected to a shaping air supply path provided in the coating gun. In the case where the jet outlet is disposed behind the outer peripheral edge of the rotary atomizing head and is spaced from the outer peripheral surface of the rotary atomizing head, the outer peripheral edge of the jet outlet is The coating apparatus according to claim 1, wherein the coating apparatus projects forward from the edge on the inner peripheral side. The coating apparatus according to claim 1, wherein the jet port is configured to continuously open over the entire circumference. The supply path provided in the coating gun is provided with a plurality of spiral flow paths having a spiral shape substantially concentric with the rotation center of the rotary atomizing head at intervals in the circumferential direction. The coating apparatus according to claim 3. The said supply channel is provided with the cyclic | annular annular flow path which continues to the front end of the said spiral flow path, and the rear end of the said jet outlet, and continues over the perimeter. Painting equipment. 6. The coating apparatus according to claim 5, wherein a cross-sectional area perpendicular to the rotation center of the rotary atomizing head in the annular flow path gradually decreases from the spiral flow path side toward the ejection port side. . The coating apparatus according to any one of claims 4 to 6, wherein a spiral direction of the cleaning liquid ejected from the ejection port is opposite to a rotational direction of the rotary atomizing head.

Images