JP2009285642A - Rotary atomizing coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary atomizing coater that can adjust the flow velocity of shaping air so as to be suitable to each kind of paint while maintaining a specified pattern diameter even when the discharge rate of the paint fluctuates in the case that a plurality kinds of paint each of which has a different suitable flow velocity of the shaping air are used. <P>SOLUTION: Two air passages 16A and 16B which are to be connected to independent air sources 17A and 17B respectively are formed in the coater 10. Jet nozzles 24A and 24B are separated into two systems so as to correspond to two air passages 16A and 16B respectively. The jetting directions of the jet nozzles 24A and 24B are set so that two systems of the shaping air S jetting from the two jet nozzles 24A and 24B join each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary atomizing coating machine.

  Patent Document 1 discloses a rotary atomization in which a paint discharged radially from the outer peripheral edge of a rotary atomizing head is formed into a predetermined pattern diameter by being surrounded by shaping air and applied to an object to be coated. A coating machine is disclosed. Shaping air is ejected from two outlets arranged along two circles that are concentric with the rotary atomizing head and have different diameters, and is ejected from an outlet arranged inside the two outlets. The first shaping air is set at a high pressure and a small flow rate as compared with the second shaping air ejected from the ejection port disposed outside.

The fact that the shaping air is ejected at a high pressure means that the flow velocity is fast and the force for accelerating the paint is strong. Further, the large flow rate of the shaping air means that the force for forming a predetermined pattern diameter while suppressing the scattering amount of the paint is strong. Therefore, in the above-described rotary atomizing coating machine, the first shaping air mainly plays a role of accelerating the paint, and the second shaping air mainly plays a role of forming the paint into a predetermined pattern diameter.
JP 07-265746 A

  There are metallic paints and solid paints as paint types. In the metallic paint, since the coating quality is greatly affected by the flow velocity of the shaping air, it is preferable that the flow velocity of the shaping air is increased with priority on the coating quality. On the other hand, in the case of a solid paint, since the coating quality is not affected by the flow velocity of the shaping air, it is preferable to lower the flow velocity of the shaping air in order to give priority to the painting efficiency. Also, in terms of paint pattern formation, it is necessary to increase the flow rate of shaping air as the amount of paint discharged increases, regardless of the type of paint.

  In view of these points, in the rotary atomizing coating machine in which the magnitude relationship between the flow velocity and the flow rate is defined between the first shaping air and the second shaping air as described above, the metallic and solid 2 If you try to paint using different types of paint, the following problems will occur.

  For example, when metallic coating is performed with a small amount of paint discharged, it is necessary to reduce the flow rate of the second shaping air in order to maintain a predetermined pattern diameter. For the above, the flow rate is made smaller than that of the second shaping air by suppressing the supplied air pressure. However, suppressing the supply air pressure of the first shaping air means that the flow velocity of the first shaping air is reduced, so that the coating quality is deteriorated in metallic coating that requires high-speed shaping air. Will come.

In addition, when solid coating is performed with a large amount of paint discharged, it is necessary to increase the flow rate by increasing the supply air pressure of the second shaping air in order to maintain a predetermined pattern diameter. As for the first shaping air, the supply air pressure is increased to maintain a higher pressure than the second shaping air. However, if the first shaping air is set to a high pressure and its flow rate is increased, the coating efficiency is reduced.
The present invention has been completed on the basis of the above circumstances, and when a plurality of types of paints having different flow rates of suitable shaping air are used, even if the amount of paint discharged varies, a predetermined pattern is obtained. An object of the present invention is to adjust the flow velocity of the shaping air to a speed suitable for each paint while maintaining the diameter.

  As means for achieving the above object, the invention of claim 1 is directed to a coating machine main body, a rotary atomizing head rotatably provided at a front end portion of the coating machine main body, and a front end portion of the coating machine main body. And a jet outlet provided along a circle concentric with the rotary atomizing head, and the paint discharged radially from the outer peripheral edge of the rotary atomizing head is surrounded by shaping air jetted from the jet outlet. In the rotary atomizing coating machine that is shaped to have a predetermined pattern diameter and is applied to the object by multiplying the flow of the shaping air, an individual air supply source is provided in the coating machine main body. A plurality of air flow paths connected to the plurality of air flow paths are formed, and the jet ports are divided into a plurality of systems so as to correspond to the plurality of air flow paths, and the jet directions of the jet ports are different from each other. Spouted from the spout Having said shaping air of a plurality of systems where that is the direction for combining the.

  According to a second aspect of the present invention, in the first aspect of the present invention, the plurality of nozzles are arranged so as to be alternately arranged in a circumferential direction on a circumference having substantially the same diameter, and are different from each other. It is characterized in that the jetting directions of the shaping air from the two jet outlets arranged adjacent to each other in the direction are substantially the same.

  According to a third aspect of the present invention, the main body of the coating machine according to the second aspect of the present invention has a ring-shaped member having a plurality of nozzles opened on the front surface thereof, and the jets in the ring-shaped member. In the region behind the outlet, a plurality of annular flow passages that are partitioned in a radial direction by circular partition walls and arranged concentrically are formed so as to correspond to the plurality of jet outlets according to the system. In the ring-shaped member, an ejection hole extending from the ejection port to the annular flow path is formed, and the ejection hole includes a rotation center axis of the rotary atomizing head and includes the ejection port. It is characterized in that it is configured to penetrate linearly in an oblique direction with respect to a virtual plane that crosses.

<Invention of Claim 1>
When coating is performed using paint that requires high-speed shaping air and the discharge amount of the paint is suppressed, shaping air is ejected at a high pressure from only one or a part of the plurality of systems. . In this way, since the flow rate of the shaping air can be suppressed in accordance with the discharge amount of the paint, it can be formed into a predetermined pattern diameter and high-speed shaping air is ejected, so that the coating quality is excellent.

  In addition, when coating is performed using a large amount of paint for which it is preferable that the shaping air is low in consideration of the coating efficiency, shaping is performed from all of a plurality of systems or a large number of outlets. Air is blown out at low pressure. In this way, since a large amount of shaping air is ejected in accordance with the discharge amount of the paint, it can be formed into a predetermined pattern diameter, and low-speed shaping air is ejected, so that the coating efficiency is excellent.

<Invention of Claim 2>
Spouts of shaping air from two jet outlets that are arranged in a circumferential direction on a circle having substantially the same diameter and are arranged in a circumferential direction, and are arranged in different systems and adjacent to each other in the circumferential direction. Since the directions are substantially the same, the shaping air ejected from the plurality of system ejection ports can be merged in a rectifying manner without extremely intersecting.

<Invention of Claim 3>
In order to make the flow rate and flow velocity of the shaping air from a plurality of jets constituting one system uniform, one of the plurality of jets constituting one system along the direction in which the jets are arranged. A structure in which an annular channel is provided and a plurality of ejection holes communicating from the annular channel to each ejection port is desirable. Therefore, when a plurality of jet outlets are provided, a plurality of annular flow paths are provided concentrically.

  In such a structure, two jet nozzles arranged in two or more different systems that are adjacent to each other in the circumferential direction are arranged on the circumference of substantially the same diameter so as to be alternately arranged in the circumferential direction. When trying to make the ejection direction of the shaping air from the outlet almost the same direction, the shape of the ejection hole corresponds to the rear end of the ejection hole by extending backward from the ejection port and bending it in the radial direction in the middle. The form opened to an annular flow path can be considered. However, since it is necessary to combine a plurality of parts in order to form a bent ejection hole, there are disadvantages such as an increase in the number of parts and high cost.

  Therefore, in the present invention, the ejection hole is configured to linearly penetrate in an oblique direction with respect to a virtual plane that includes the rotation center axis of the rotary atomizing head and crosses the ejection port. With such a configuration, the rear ends of the two ejection holes extending obliquely rearward from the two different outlets adjacent to each other in the circumferential direction to the annular channel are displaced in the radial direction in the annular channel. It is possible to open the aperture in a positional relationship. Thereby, it becomes possible to connect the spout of different systems lined up in the circumferential direction and the annular flow passage partitioned in the radial direction by means of a straight jet hole, and the ring-shaped member that is the matrix for forming the jet hole is 1 Can be one part.

<Embodiment 1>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 10. The rotary atomizing coating machine P of the present embodiment includes a coating machine main body 10 and a well-known circular rotary atomizing head 26 provided at the front end of the coating machine main body 10. In the coating machine main body 10, a cylindrical rotary shaft 11 whose axis is directed in the front-rear direction is provided to be rotated at a high speed by a well-known turbine mechanism (not shown). The rotary atomizing head 26 is attached so as to be rotated concentrically and integrally. The paint supplied to the central portion of the rotary atomizing head 26 through the paint supply pipe 12 provided inside the rotary shaft 11 flows to the outer peripheral side by centrifugal force on the front surface of the rotary atomizing head 26 that is rotationally driven. Radiation is emitted from the outer peripheral edge of the rotary atomizing head 26. The discharged paint is surrounded by shaping air, which will be described later, so that it has a predetermined pattern diameter and is applied to an object to be coated (not shown) by taking advantage of the flow of shaping air. ing.

  As shown in FIGS. 1 to 3, the front end portion of the coating machine body 10 includes a first annular member 13, a second annular member 14, a third annular member 15, and a ring-shaped member 20. The parts 13, 14, 15, and 20 are all concentric with the rotating shaft 11. In the coating machine body 10, the first air flow path 16A and the second air flow path 16B are formed as independent flow paths that do not communicate with each other. The air fed from the first air supply source 17A is supplied to the first air flow path 16A, and the air fed from the second air supply source 17B to the second air flow path 16B. Is to be supplied. The pressure of air fed from the first air supply source 17A and the pressure of air fed from the second air supply source 17B can be controlled independently of each other.

  The first annular member 13 is formed with a first through hole 18A penetrating from the rear end face to the front end face and a second through hole 18B penetrating from the rear end face to the front end face in a manner that does not communicate with each other. A second annular member 14 is assembled on the front surface of the first annular member 13, and an annular communication passage 19 communicating with the second through hole 18 </ b> B is formed between the first annular member 13 and the second annular member 14. ing. A ring-shaped member 20 is assembled on the outer periphery of the second annular member 14, and the second annular member 14 and the ring-shaped member 20 are continuous over the entire circumference and are concentric with the rotating shaft 11. A second annular flow path 21B is formed. The second annular channel 21 </ b> B communicates with the annular communication passage 19 through a communication hole 22 formed in the second annular member 14.

  A third annular member 15 is assembled to the outer periphery of the first annular member 13 and the outer periphery of the ring-shaped member 20. Inside the third annular member 15, the first annular channel 21 </ b> A defined by the front surface of the first annular member 13, the outer periphery of the second annular member 14, and the outer periphery of the ring-shaped member 20 extends over the entire periphery. It is continuously formed in a circular shape concentric with the rotating shaft 11. The first annular channel 21A is arranged on the outer peripheral side of the second annular channel 21B, and the first annular channel 21A and the second annular channel 21B are circular partition walls formed in the ring-shaped member 20. 23 in the radial direction.

  On the front surface of the ring-shaped member 20, a plurality of first outlets 24A for ejecting the shaping air forward and the same number of second outlets 24B as the first outlets 24A are opened. The first jet outlet 24A and the second jet outlet 24B are concentric with the rotary atomizing head 26 and have a circumference on one (common) virtual circumference that is larger in diameter than the outer peripheral edge of the rotary atomizing head 26. They are arranged alternately in the direction. In FIG. 5 in which the ring-shaped member 20 is viewed from the front (front side), the distance between the first jet outlet 24A and the second jet outlet 24B located adjacent to the front in the clockwise direction is the front in the counterclockwise direction. Is smaller than the distance from the second jet outlet 24B located adjacent to each other.

  Each first jet outlet 24A communicates with the first annular flow path 21A through a first jet hole 25A that penetrates the ring-shaped member 20 and opens as a first inlet 27A on the rear surface thereof. As shown in FIG. 6, each first ejection hole 25 </ b> A includes a rotation center axis 26 a of the rotary atomizing head 26, and an imaginary plane Sa (FIG. 1 to FIG. 1) crossing the first ejection outlet 24 </ b> A of the first ejection hole 25 </ b> A. The ring-shaped member 20 is linearly penetrated in an oblique direction with respect to the surface shown in FIG. The inclination direction of the first ejection hole 25A is inclined in the counterclockwise direction from the first annular channel 21A toward the first ejection port 24A.

  The cross section along the line XX in FIG. 5 is perpendicular to the cross section including the rotation center axis 26a of the rotary atomizing head 26 and passing through the first outlet 24A, and crosses the first outlet 24A without including the rotation center axis 26a. FIG. 6 is a cross-sectional view. On the X-X line cross section, the angle α formed between the rotation center axis 26a (virtual plane Sa) and the penetrating direction line of the first ejection hole 25A (that is, the ejection direction of the shaping air from the first ejection outlet 24A) is 55 °. In addition, as shown in FIG. 2, the rotation center axis on the virtual plane Sa (that is, a plane parallel to the paper surface of FIG. 2) that includes the rotation center axis 26a of the rotary atomizing head 26 and crosses the first ejection port 24A. An angle θa formed by 26a and the penetrating direction of the first ejection hole 25A (that is, the shaping air ejection direction) is 15 °. Further, on the cross section orthogonal to the rotation center axis 26a shown in FIG. 9 (that is, the cross section taken along the line CC in FIG. 8), the first ejection hole 25A extends in a substantially tangential direction substantially perpendicular to the radial direction. It has become. The cross-sectional shape of this first ejection hole 25A (the shape of the transverse cross section perpendicular to the penetrating direction of the first ejection hole 25A) is a perfect circle. Therefore, the opening shape of the first jet outlet 24A on the front surface of the ring-shaped member 20 is an ellipse that is long in the circumferential direction.

  Each of the second ejection ports 24B communicates with the second annular channel 21B through a second ejection hole 25B that penetrates the ring-shaped member 20 and opens as a second inflow port 27B on the rear surface thereof. As shown in FIG. 7, each second ejection hole 25 </ b> B includes a rotation center axis 26 a of the rotary atomizing head 26, and an imaginary plane Sb that crosses the second ejection opening 24 </ b> B of the second ejection hole 25 </ b> B (FIG. 1 to FIG. 1). The ring-shaped member 20 is linearly penetrated in an oblique direction with respect to the surface shown in FIG. The direction of the inclination of the second ejection hole 25B is a direction inclined in the counterclockwise direction from the second annular flow path 21B toward the second ejection outlet 24B (that is, substantially the same direction as the first ejection hole 25A). ing.

  The cross section along line YY in FIG. 5 is orthogonal to the cross section passing through the second jet outlet 24B including the rotation center axis 26a of the rotary atomizing head 26 and crosses the second jet outlet 24B without including the rotation center axis 26a. FIG. 7 is a cross-sectional view. On the YY line cross section, the angle β formed by the rotation center axis 26a (virtual surface Sb) and the penetrating direction of the second ejection hole 25B is 55.61 °, which is substantially the same angle as the first ejection hole 25A. (To be precise, the angle is slightly larger than the first ejection holes 25A). Further, as shown in FIG. 3, on the virtual plane Sb including the rotation center axis 26a of the rotary atomizing head 26 and crossing the second ejection port 24B (that is, a plane parallel to the paper surface of FIG. 3), the rotation center axis The angle θb formed between the line 26a and the penetrating direction line of the second ejection hole 25B (ie, the shaping air ejection direction) is 5 °, which is smaller than the first ejection hole 25A. Further, on the cross section orthogonal to the rotation center axis 26a shown in FIG. 9 (that is, the cross section taken along the line CC in FIG. 8), the second ejection hole 25B has a substantially tangential direction (that is, a first direction substantially perpendicular to the radial direction). 1 jetting hole 25A).

  The cross-sectional shape of this second ejection hole 25B (the shape of the transverse cross section perpendicular to the penetrating direction of the second ejection hole 25B) is a perfect circle. Therefore, the opening shape of the 2nd jet nozzle 24B in the front surface of the ring-shaped member 20 becomes an ellipse long in the circumferential direction. Further, the sectional area of the second ejection holes 25B is the same as the sectional area of the first ejection holes 25A. Therefore, the total opening area of all the second ejection openings 24B is the total opening area of all the first ejection openings 24A. Is the same.

  The first through hole 18A, the first annular flow path 21A, and the first ejection hole 25A constitute a first air flow path 16A. The air supplied to the first air flow path 16A is ejected in a cylindrical shape as shaping air from the plurality of first ejection ports 24A. The ejection direction of the shaping air ejected forward from the first ejection port 24A is parallel to the penetration direction of the first ejection hole 25A, and includes the rotation center axis 26a of the rotary atomizing head 26 and the first ejection port 25A. On the crossing virtual plane Sa (see FIG. 2), it is inclined inward so as to approach the rotation center axis 26 a of the rotary atomizing head 26. However, as shown in FIG. 6, since the ejection direction of the shaping air is oblique with respect to the virtual plane Sa, the ejection direction line of the shaping air does not intersect the rotation center axis 26a.

  Further, the second through hole 18B, the annular communication path 19, the communication hole 22, the second annular flow path 21B, and the second ejection hole 25B constitute a second air flow path 16B. The air supplied to the second air flow path 16B is ejected in a cylindrical shape as shaping air from the plurality of second ejection ports 24B. The ejection direction of the shaping air ejected forward from the second ejection port 24B is parallel to the penetration direction of the second ejection hole 25B, and includes the rotation center axis 26a of the rotary atomizing head 26 and the second ejection port 24B. On the imaginary plane Sb (see FIG. 3) that crosses, it is inclined inward so as to approach the rotation center axis 26 a of the rotary atomizing head 26. However, as shown in FIG. 7, since the ejection direction of the shaping air is an oblique direction with respect to the virtual plane Sb, the ejection direction line of the shaping air does not intersect the rotation center axis 26a.

  Next, the operation of this embodiment will be described. In the rotary atomizing coating machine P of the present embodiment, coating can be performed using various paints such as metallic paint, solid paint, and clear paint. In general, in terms of paint pattern formation, it is necessary to increase the flow rate of shaping air as the amount of paint discharged increases, regardless of the type of paint. Also, in terms of coating efficiency, regardless of the type of paint, if the flow velocity of shaping air becomes too fast, the amount of paint that scatters around and does not adhere to the workpiece increases. Has an upper limit.

  In metallic paint, since the coating quality is greatly influenced by the flow velocity of shaping air, it is required to prioritize the coating quality over the painting efficiency. In order to perform high-quality coating, it is necessary to eject shaping air at a relatively high speed, for example, about 18 m / sec.

  Accordingly, when coating is performed using a relatively small amount of metallic paint, air is supplied at a relatively high pressure from the first air supply source 17A, but air is not supplied from the second air supply source 17B. Shaping air is ejected from only the first ejection port 24A. Since the flow rate of the shaping air at this time is small as compared with the case of ejecting from both the first ejection port 24A and the second ejection port 24B, a small amount of metallic paint can be formed into a predetermined pattern diameter. Further, since the pressure of the air supplied from the first air supply source 17A is high, the flow speed of the shaping air is fast and the coating quality is high. In addition, when performing coating using a small amount of metallic paint, it is possible to change only the shaping air from only the second ejection port 24B instead of the method of ejecting the shaping air only from the first ejection port 24A. A high coating quality can be obtained while forming to a pattern diameter of.

  In addition, when coating is performed using a relatively large amount of metallic paint, relatively high-pressure air is supplied from both the first air supply source 17A and the second air supply source 17B, Shaping air is ejected from both of the second ejection ports 24B. The two types of ejected shaping air merge to form one cylindrical shaping air, and the metallic paint is formed into a predetermined pattern. Since the flow rate of the shaping air at this time is larger than that in the case of ejecting from only one of the first ejection port 24A and the second ejection port 24B, a large amount of metallic paint can be formed into a predetermined pattern diameter. Further, since the pressure of the air supplied from the first air supply source 17A and the second air supply source 17B is high, the flow speed of the shaping air is fast and the coating quality is high.

  In contrast to the metallic paint described above, in the case of a solid paint (clear paint and dark metallic paint are the same), the paint quality is not affected by the flow speed of the shaping air, so the shaping air is controlled with priority on the painting efficiency. The In order to improve the coating efficiency, it is necessary to keep the flow velocity low. Specifically, a flow rate of about 7 to 8 m / sec is preferable for the solid paint, a flow rate of 5 m / sec or less is preferable for the clear paint, and a flow rate of about 10 m / sec is preferable for the dark metallic paint. In any case, the preferred flow rate is slower than that of metallic paint.

  When coating is performed using a relatively small amount of solid paint, air is supplied from the first air supply source 17A at a relatively low pressure, but air is not supplied from the second air supply source 17B. Shaping air is ejected from only the first ejection port 24A. Since the flow rate of the shaping air at this time is small as compared with the case of jetting from both the first jet port 24A and the second jet port 24B, a small amount of solid paint can be formed into a predetermined pattern diameter.

  Further, since the pressure of the air supplied from the first air supply source 17A is low, the flow speed of the shaping air is slow and the coating efficiency is high. In addition, when performing painting using a small amount of solid paint, it is possible to change the method in which the shaping air is ejected from only the first ejection port 24A, or to eject only the shaping air from only the second ejection port 24B. It is possible to obtain high coating quality while molding to a pattern diameter of.

  Further, when coating is performed using a relatively large amount of solid paint, relatively low-pressure air is supplied from both the first air supply source 17A and the second air supply source 17B, and the first jet outlet 24A Shaping air is ejected from both of the second ejection ports 24B. The two types of shaped air that has been ejected merge to form one shaped air, and the solid paint is formed into a predetermined pattern. Since the flow rate of the shaping air at this time is larger than that in the case of ejecting from only one of the first ejection port 24A and the second ejection port 24B, a large amount of solid paint can be formed into a predetermined pattern diameter. Further, since the pressure of the air supplied from the first air supply source 17A and the second air supply source 17B is low, the flow rate of the shaping air is slow and the coating efficiency is high.

  As described above, in the present embodiment, the two air flow paths 16A and 16B connected to the individual air supply sources 17A and 17B are formed in the coating machine body 10, and the jet outlets 24A and 24B are connected to the two outlets 24A and 24B. The system is divided into two systems so as to correspond to the air flow paths 16A and 16B of the system, and the two directions of the shaping air ejected from the two system outlets 24A and 24B are merged. Oriented. As a result, when multiple types of paints with different preferred shaping air flow rates are used, the shaping air flow rate is adjusted to a speed suitable for each paint while maintaining a predetermined pattern diameter even if the discharge rate of the paint fluctuates. Can be adjusted.

  Further, two jet outlets 24A, 24B are arranged so as to be alternately arranged in the circumferential direction on a circumference having substantially the same diameter, and two jet outlets 24A, 24A, 24A, which are different from each other and are arranged adjacently in the circumferential direction Since the jetting direction of the shaping air from 24B is made substantially the same direction, the shaping air jetted from the two system outlets 24A and 24B can be merged in a rectifying manner without extremely intersecting.

  Further, in the present embodiment, one annular flow path corresponding to the plurality of jet outlets 24A, 24B constituting one system is provided so as to follow the arrangement direction of the jet outlets 24A, 24B. By forming a plurality of ejection holes 25A and 25B communicating with the ejection ports 24A and 24B from the road, the flow rate and flow velocity of the shaping air from the plurality of ejection ports 24A and 24B constituting one system are made uniform. I have to. Moreover, since the jet nozzles 24A and 24B are provided in two systems, the two annular channels 21A and 21B are provided in concentric circles having different diameters. Further, the two outlets 24A, 24B are arranged so as to be alternately arranged in the circumferential direction on the circumference of substantially the same diameter, and then two different systems are arranged adjacent to each other in the circumferential direction. The ejection direction of the shaping air from the ejection ports 24A and 24B is set to be substantially the same direction.

  In the case of such a structure, the form of the ejection holes extending from the ejection outlets 24A, 24B to the annular flow paths 21A, 21B extends rearward from the ejection outlets 24A, 24B, and is bent in the radial direction in the middle, thereby A configuration in which the rear ends of the rear ends are opened to the corresponding annular flow paths 21A and 21B is conceivable. However, in order to form a bent ejection hole, it is necessary to form the ejection hole forming matrix in a form in which a plurality of parts are combined. Thus, there are disadvantages such as an increase in the number of parts and high cost.

  Therefore, in the present embodiment, as shown in FIGS. 6 and 7, the ejection holes 25A and 25B are arranged with respect to virtual surfaces Sa and Sb including the rotation center axis 26a of the rotary atomizing head 26 and crossing the ejection ports 24A and 24B. Thus, it is configured to penetrate linearly in an oblique direction. With such a configuration, as shown in an enlarged view in FIG. 9, two jet holes extending obliquely rearward from the two different outlets 24A, 24B adjacent in the circumferential direction to the annular flow paths 21A, 21B. The inlets 27A and 27B at the rear ends of 25A and 25B can be opened in the annular flow paths 21A and 21B in a positional relationship that is displaced in the radial direction. Thereby, it becomes possible to connect the outlets 24A and 24B of different systems arranged in the circumferential direction and the annular flow paths 21A and 21B partitioned in the radial direction by the linear ejection holes 25A and 25B. , 25B forming the ring-shaped member 20 as a single component.

<Other embodiments>
The present invention is not limited to the embodiments 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.
(1) In the above-described embodiment, two spouts are provided. However, the present invention is not limited to this, and the number of spouts may be three or more.
(2) In the above embodiment, the two systems of jets are arranged on the circumference of substantially the same diameter. However, the present invention is not limited to this, and the two systems of jets are separately arranged on the circumferences having different diameters. May be.
(3) In the above-described embodiment, the number of the two system outlets is the same. However, the number is not limited thereto, and the number of the two system outlets may be different from each other. In this case, the number of jet outlets of one system may be an integer multiple of the number of jet outlets of the other system or may not be an integer multiple.
(4) In the above-described embodiment, the opening areas of the two nozzles are substantially the same. However, the present invention is not limited to this, and the opening areas of the two nozzles may be different from each other.
(5) In the above-described embodiment, the direction in which the shaping air is ejected from two ejection ports that are different from each other and are arranged adjacent to each other in the circumferential direction includes a virtual axis that includes the rotation center axis of the rotary atomizing head and crosses the ejection port. Although it was made to become a mutually different direction on a surface (refer FIGS. 1-3), it is not restricted to this, The ejection direction of the shaping air from two different jet nozzles distribute | arranged so that it may adjoin to the circumferential direction However, you may make it become the same direction on the said virtual surface.
(6) In the above embodiment, the imaginary direction in which the shaping air is ejected from the two ejection ports that are different from each other and are arranged adjacent to each other in the circumferential direction includes the rotation center axis of the rotary atomizing head and crosses the ejection port. On the surface (see FIGS. 1 to 3), all of them are inclined inward so as to approach the rotation center axis of the rotary atomizing head. The jetting direction of the shaping air from the two different jet outlets of the different systems may be such that the two systems are obliquely outward on the virtual plane so that both of them are separated from the rotation center axis of the rotary atomizing head. The jet direction from the jet outlet of one system may be obliquely inward, and the jet direction from the other jet outlet may be obliquely outward.
(7) In the above embodiment, the virtual plane in which the jetting direction of the shaping air from the two jetting ports that are different from each other and are arranged adjacent to each other in the circumferential direction is orthogonal to the rotation center axis of the rotary atomizing head (FIG. 9). However, the present invention is not limited to this, and the jetting direction of the shaping air from two different jet outlets arranged adjacent to each other in the circumferential direction is determined on the virtual plane. The directions may be different from each other.
(8) In the above embodiment, the cross-sections of the shaping air from the two outlets that are different from each other and are arranged adjacent to each other in the circumferential direction include the rotation center axis of the rotary atomizing head and pass through the outlet. Are substantially the same direction on a virtual plane (see FIGS. 6 and 7) that intersects with the nozzle and does not include the rotation center axis, but is not limited to this, and is adjacent to the circumferential direction. The jetting direction of the shaping air from the two jetting outlets of different arranged systems may be different from each other on the virtual plane.
(9) In the above embodiment, the shaping air is ejected in an oblique direction with respect to a virtual plane (a surface appearing in FIGS. 1 to 3) that includes the rotation center axis of the rotary atomizing head and crosses the ejection port. However, the present invention is not limited to this, and the direction in which the shaping air is ejected is the direction along the imaginary plane that crosses the ejection port including the rotation center axis of the rotary atomizing head (that is, the direction parallel to the rotation center axis or the rotation center axis). Or the direction intersecting).
(10) In the above embodiment, the opening shape of the jet port is an ellipse. However, the opening shape of the jet port is not limited to this, and may be, for example, an arc shape that is elongated along the circumferential direction. .

A longitudinal sectional view showing a front end portion of the rotary atomizing coating machine of the first embodiment Partial enlarged vertical sectional view showing the first ejection hole Partially enlarged vertical sectional view showing the second ejection hole Perspective view showing the front end of a rotary atomizing coating machine Front view of ring-shaped member XX sectional view of FIG. YY sectional view of FIG. Side view of ring-shaped member ZZ sectional view of FIG. Side view showing the state of shaping air being blown out

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Coating machine main body 16A ... 1st air flow path 16B ... 2nd air flow path 17A ... 1st air supply source 17B ... 2nd air supply source 20 ... Ring-shaped member 21A ... 1st annular flow path 21B ... 2nd annular Flow path 24A ... 1st jet nozzle 24B ... 2nd jet nozzle 26 ... Rotary atomization head 26a ... Rotation center axis of rotary atomization head Pa, Pb ... Virtual plane including rotation center axis of rotary atomization head and crossing jet nozzle S ... Shaping air

Claims (3)

The main body of the coating machine,
A rotary atomizing head provided rotatably at the front end of the coating machine body;
A spout provided along the circle concentric with the rotary atomizing head at the front end of the coating machine body;
The paint discharged radially from the outer peripheral edge of the rotary atomizing head is formed into a predetermined pattern diameter by surrounding with the shaping air ejected from the ejection port, and the coating is applied by taking advantage of the flow of the shaping air. In a rotary atomizing coating machine designed to be applied to objects,
In the coating machine body, a plurality of air flow paths connected to individual air supply sources are formed,
The spout is divided into a plurality of systems so as to correspond to the plurality of air flow paths,
The rotary atomizing coating machine is characterized in that the ejection direction of the ejection port is a direction in which a plurality of types of shaping air ejected from the ejection ports of different systems are merged. The plurality of spouts are arranged so as to be alternately arranged in the circumferential direction on a circumference having substantially the same diameter,
The rotary atomizing coating machine according to claim 1, wherein the jetting directions of the shaping air from the two jetting ports that are different from each other and are arranged adjacent to each other in the circumferential direction are substantially the same. . The coating machine main body has a ring-shaped member having a plurality of spouts opened on the front surface,
A plurality of annular channels concentrically arranged in a radial direction by a circular partition wall in a region rearward of the jet outlet in the ring-shaped member are systematic with respect to the plurality of jet outlets. It is formed to correspond separately,
In the ring-shaped member, a jet hole extending from the jet port to the annular flow path is formed,
The said ejection hole is made into the form penetrated linearly in the diagonal direction with respect to the virtual surface which includes the rotation center axis | shaft of the said rotary atomization head, and crosses the said ejection port. Rotary atomizing coating machine.

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