JP6005497B2 - Rotary atomizing head type coating machine - Google Patents

Description

  The present invention relates to a rotary atomizing head type coating machine that performs coating by spraying a paint using a rotary atomizing head.

  In the painting of automobile bodies and automobile parts, strict painting quality is required, and therefore, a rotary atomizing head type coating machine capable of performing uniform and high quality painting is used.

  As shown in FIG. 10, the conventional rotary atomizing head type coating machine 50 is provided with a bell-type rotary atomizing head 52 on the tip side of the coating machine main body 51. And the rotary atomizing head type coating machine 50 rotates the rotary atomizing head 52 by the air motor 53 provided in the coating machine main body 51, and atomizes and sprays a coating material with the centrifugal force. In addition, an air outlet 55 is provided at a position behind the outer peripheral edge of the rotary atomizing head 52 at the tip of the coating machine main body 51, from the air outlet 55 toward the periphery of the outer peripheral edge of the rotary atomizing head 52. Shaping air A1 is ejected. By ejecting the shaping air A1, the spray paint is prevented from diffusing and uniform and high-quality coating is performed.

  However, when the shaping air A1 is ejected, an accompanying flow is generated, and a negative pressure region is generated on the back surface 56 side of the rotary atomizing head 52. For this reason, as a result of the paint dust P1 floating around the rotary atomizing head type coating machine 50 being attracted to the negative pressure region, the front end surface 51a of the coating machine body 51, the back surface 56 of the rotary atomizing head 52, and the like. The dirt of the paint dust P1 adheres to the surface. And when this dirt increases, the adhering coating material solidifies and peels off, resulting in a quality defect called “butsu” and lowering the coating quality. In order to avoid this, it is necessary to frequently perform a cleaning operation of the coating machine 50 and the maintenance cost increases.

  Further, in Patent Document 1, supplementary air is supplied toward the negative pressure region on the back surface 56 side of the rotary atomizing head 52 in order to prevent the coating material from adhering to the back surface 56 of the rotary atomizing head 52. A constructed rotary atomizing head type coater is disclosed. This rotary atomizing head type coating machine is provided with a dedicated pressure source (such as an air pump) for supplying supplementary air, and by controlling the flow rate of supplementary air from the pressure source, paint dust P1 is applied to the negative pressure region. Is prevented, and supplementary air is prevented from adversely affecting the finished state of the paint.

  Incidentally, in Patent Document 2, a concave and convex groove is provided at the edge of the back surface 56 of the rotary atomizing head 52, and the shaping air A1 is applied to a portion where the concave and convex groove is formed in the rotary atomizing head 52 to generate a swirling flow. A rotary atomizing head type coater that performs painting with a small amount of air is disclosed.

JP-A-9-285742 JP-A-8-99053

  By the way, in the rotary atomizing head type coating machine of patent document 1, in order to supply supplementary air, it is necessary to provide a dedicated pressure source, such as an air pump, and equipment cost and running cost will increase.

  Further, in the rotary atomizing head type coating machine of Patent Document 2, since the swirling flow of the shaping air A1 is made by the concave and convex grooves, the negative pressure on the back surface 56 of the rotary atomizing head 52 is reduced by providing the concave and convex grooves. It will increase. Accordingly, the provision of the concave and convex grooves acts in a direction in which the dirt of the paint dust P1 is attracted, so that the dirt on the tip surface 51a of the coating machine main body 51, the back surface 56 of the rotary atomizing head 52, and the like becomes a problem.

  The present invention has been made in view of the above problems, and its object is to provide a rotary atomizing head type coating machine capable of reducing dirt adhering to the tip surface of the coating machine body while suppressing an increase in cost. It is to provide.

  In order to solve the above-mentioned problem, the invention described in means 1 is provided with a coating machine main body having an air motor therein and supported by a coating machine support, provided on the tip side of the coating machine main body, and rotated by the air motor. It has a bell-shaped rotary atomizing head that is driven and discharges paint from the front side, and an air jet opening that opens at the front end side of the coating machine main body and at the rear position of the outer peripheral edge of the rotary atomizing head. And a rotary atomizing head type coating machine provided with air jetting means for jetting shaping air from the air jet port to the periphery of the outer peripheral edge of the rotary atomizing head. And a communication path communicating with the atmospheric pressure region in the coating machine support body through the interior of the coating machine body at a position closer to the central axis side of the rotary atomizing head than the outer peripheral edge and the air ejection port, or The interior of the coating machine A communication passage communicating with the atmospheric pressure region outside the coating booth is formed through the inside of the coating machine support, and is on the back surface of the rotary atomizing head and more than the outer peripheral edge and the air jet outlet. Airflow generation that generates a flow of air from the center of the rotary atomizing head toward the outer periphery along the back surface of the rotary atomizing head when the rotary atomizing head is rotationally driven at a position on the central axis side of the chemical head The gist of the rotary atomizing head type coating machine is characterized in that a part is provided.

  According to the invention described in the means 1, the shaping air is ejected from the air ejection opening opened at the rear position of the outer peripheral edge of the rotary atomizing head. In the present invention, since air in the atmospheric pressure region is supplied to the back side of the rotary atomizing head via the communication path, even when shaping air is ejected, the back side region does not become negative pressure. Further, since the air flow generation site is provided on the back surface of the rotary atomizing head and at a position closer to the central axis side of the rotary atomizing head than the outer peripheral edge and the air outlet, the rotary atomizing head rotates. Accordingly, air flows from the center of the rotary atomizing head toward the outer periphery by the air flow generation site. As a result, the paint dust is prevented from entering the back side of the rotary atomizing head. For this reason, the adhesion of the dirt of the paint dust can be suppressed on the front end surface of the coating machine main body and the back surface of the rotary atomizing head. In addition, the air flowing from the center of the rotary atomizing head to the outer periphery on the back side of the rotary atomizing head is supplied from the atmospheric pressure area inside the coating machine support body or the atmospheric pressure area outside the coating booth via the communication path, and the paint dust Does not contain clean air. Therefore, even if this air is mixed into the shaping air, the coating quality is not affected. Furthermore, in the present invention, it is not necessary to separately provide a dedicated air pump or the like as in the prior art, so that the equipment cost and running cost of the coating machine can be kept low.

  The invention described in means 2 is that, in the means 1, the air flow generation site is a plurality of elongated blade portions extending along the radial direction of the rotary atomizing head on the back surface. The gist.

  According to the invention described in Means 2, the air flow generation site is a plurality of long blade portions extending along the radial direction of the rotary atomizing head on the back surface. An air flow (airflow) from the center of the chemical head toward the outer periphery can be generated efficiently and reliably. As a result, the adhesion of dirt due to paint dust can be suppressed.

  The gist of the invention described in the means 3 is that, in the means 2, the blade portion is arranged at a position where the inclination angle with respect to the central axis of the rotary atomizing head is maximized on the back surface. .

  According to the invention described in Means 3, since the blade portion is arranged at the portion where the inclination angle on the back surface is maximized, the blade portion can efficiently generate an air flow from the center of the rotary atomizing head to the outer periphery. Thus, it is possible to reliably suppress the adhesion of dirt due to paint dust.

  The gist of the invention described in means 4 is that, in the means 2, the blade portion is arranged at a position where the inclination angle with respect to the central axis of the rotary atomizing head is more than 45 ° on the back surface. And

  According to the invention described in Means 4, since the blade portion is disposed at a portion where the inclination angle on the back surface exceeds 45 °, the blade portion efficiently generates an air flow from the center of the rotary atomizing head to the outer periphery. Thus, the adhesion of dirt due to paint dust can be reliably suppressed.

  According to the invention described in Means 5, in any one of Means 2 to 4, the blade part has an outer peripheral side end and a center side end, and the communication path is located at a position behind the center side end of the blade part. The gist is that it is open.

  According to the invention described in the means 5, air is supplied to the center side end of the blade part on the back surface of the rotary atomizing head through the communication path, and the air flows from the center side end toward the outer peripheral side end by the blade part. As a result, it is possible to reliably generate an air flow from the center of the rotary atomizing head to the outer periphery, and to suppress the adhesion of dirt due to paint dust.

  The invention described in means 6 is that, in any one of means 2 to 5, the blade portion has an outer peripheral side end and a center side end, and the rotation trajectory of the outer peripheral side end when the rotary atomizing head rotates. The gist of the maximum diameter is 0.7 to 0.9 times the outer diameter of the rotary atomizing head.

  If the blade portion on the back surface of the rotary atomizing head is too long, the airflow caused by the blade portion affects the shaping air, and there is a concern that the coating quality may deteriorate. On the other hand, if the blade portion is too short, a sufficient air volume cannot be secured and the effect of suppressing dirt cannot be obtained. Accordingly, as in the invention described in the means 6, when the blade portion is formed so that the maximum diameter of the rotation trajectory at the outer peripheral side end is not less than 0.7 times and not more than 0.9 times the outer diameter of the rotary atomizing head. The air flow from the center of the rotary atomizing head to the outer periphery can be generated with an accurate air volume. As a result, it is possible to reliably suppress adhesion of dirt due to paint dust without deteriorating the coating quality.

  As described above in detail, according to the inventions described in the means 1 to 6, a rotary atomizing head type coating machine capable of reducing dirt adhering to the tip surface of the coating machine main body while suppressing an increase in cost is provided. To do.

The side view which shows the rotary atomizing head type coating machine of one Embodiment. The principal part sectional drawing which shows the rotary atomization head type coating machine of one Embodiment. The rear view which shows the rotary atomization head of one Embodiment. The rear view which shows the rotary atomization head which changed the length of the blade | wing part. Explanatory drawing for demonstrating the level of the adhesion amount of paint dust. Explanatory drawing for demonstrating the level of the adhesion amount of paint dust. Sectional drawing which shows the rotary atomization head of another embodiment. Sectional drawing which shows the rotary atomization head of another embodiment. Sectional drawing which shows the rotary atomization head of another embodiment. Sectional drawing which shows the principal part which shows the conventional rotary atomizing head type coating machine.

  Hereinafter, an embodiment in which the present invention is embodied in a rotary atomizing head type coating machine will be described in detail with reference to the drawings.

  As shown in FIG. 1, the rotary atomizing head type coating machine 1 according to the present embodiment is an electrostatic coating machine for coating an automobile body 2, for example, and is attached to the tip of a robot arm 3. . The rotary atomizing head type painting machine 1 and the robot arm 3 are provided in a painting booth 4. Then, when the control device (not shown) drives and controls the robot arm 3, the spraying direction and position of the paint P0 sprayed from the rotary atomizing head type coater 1 are changed. As a result, the automobile body 2 conveyed into the painting booth 4 is painted.

  As shown in FIG. 2, the rotary atomizing head type coating machine 1 includes a cylindrical coating machine main body 11 having an air motor 10 therein, a cylindrical part 13 provided in the coating machine main body 11, and a cylindrical part 13. And a bell-shaped rotary atomizing head 14 (bell cup) that is rotationally driven together with the cylindrical portion 13 by the air motor 10. A coating machine main body 11 in the rotary atomizing head type coating machine 1 is supported by a robot arm 3 as a coating machine support.

  Also, a feed tube (not shown) is extended in the axial direction in the cylindrical portion 13 so that the paint from the paint supply device (not shown) is supplied to the rotary atomizing head 14 via the feed tube. It has become. The rotary atomizing head 14 is driven to rotate to release paint from the front side.

  A plurality of air jets 21 are open at the front end side of the coating machine main body 11 and at the rear position of the outer peripheral edge of the rotary atomizing head 14. These air outlets 21 are connected to an air supply passage 22 extending from the base end side toward the tip end side in the coating machine main body 11. Further, the air supply passage 22 is connected to an air supply source 23 (such as an air pump) provided outside the coating machine body 11. In the rotary atomizing head type coating machine 1 according to the present embodiment, the air supply means 23, the air supply passages 22, and the air outlets 21 constitute air jetting means. The rotary atomizing head type coating machine 1 ejects the shaping air A <b> 1 supplied from the air supply source 23 via the air supply passage 22 from each air outlet 21 toward the periphery of the outer peripheral edge of the rotary atomizing head 14. .

  Moreover, in the rotary atomizing head type coating machine 1, it is the front end side of the coating machine main body 11, and is on the central axis O1 side of the rotary atomizing head 14 from the outer peripheral edge of the rotary atomizing head 14 and the air outlet 21. A communication path 25 communicating with the atmospheric pressure region in the robot arm 3 through the interior of the coating machine body 11 is formed at the position. The communication path 25 is opened at the front end surface 11 a of the coating machine body 11. The opening diameter of the communication path 25 is a size of φ0.5 mm or more and 5 mm or less.

  Further, as shown in FIG. 2 and FIG. 3, on the back surface 26 of the rotary atomizing head 14 and at a position closer to the central axis side of the rotary atomizing head 14 than the outer peripheral edge and the air outlet 21. A plurality of long blade portions 31 are provided. Each blade portion 31 is an airflow generating portion formed so as to protrude from the back surface 26 of the rotary atomizing head 14, and extends along the radial direction of the rotary atomizing head 14 on the back surface 26 of the rotary atomizing head 14. It is installed. The blade portion 31 is formed integrally with the rotary atomizing head 14. Specifically, the blade portion 31 is formed by cutting the back surface portion of the rotary atomizing head 14. The wing | blade part 31 is a protrusion part whose height is about 5 mm-20 mm, and width is about 5 mm-20 mm, for example.

  The back surface 26 of the rotary atomizing head 14 according to the present embodiment is disposed outside the central region R1 and the central region R1 where the inclination angle α1 with respect to the central axis O1 of the rotary atomizing head 14 is the maximum. The region is divided into an outer region R2 having an inclination angle α2 smaller than the central region R1. The inclination angle with respect to the central axis O1 of the rotary atomizing head 14 is an angle (specifically, the outer region R2 is 45 ° or less (specifically α2 = about 40 °) and the central region R1 is more than 45 ° (specifically). Specifically, α1 = about 70 °). The blade portion 31 of the present embodiment is provided in the central region R1 where the inclination angle α1 is maximum on the back surface 26 of the rotary atomizing head 14.

  The blade portion 31 generates a flow (airflow) of air A2 from the center of the rotary atomizing head 14 toward the outer periphery along the back surface 26 of the rotary atomizing head 14 when the rotary atomizing head 14 is rotationally driven. The airflow generated by the blade portion 31 only needs to have an air volume of about 1/10 compared to the shaping air A1. For this reason, in this Embodiment, the two blade | wing parts 31 are provided in the position which opposes on both sides of the central axis O1 of the rotary atomization head 14. FIG. That is, on the back surface 26 of the rotary atomizing head 14, the one blade portion 31 and the other blade portion 31 are arranged so as to be rotationally symmetric.

  The blade 31 has an outer peripheral side end 32 and a center side end 33. The communication path 25 is opened at a position behind the center side end 33 of the blade portion 31. In this case, when the rotary atomizing head 14 is driven to rotate, air A2 in the atmospheric region in the robot arm 3 is supplied to the back surface 26 side of the rotary atomizing head 14 through the communication path 25. The air A <b> 2 flows from the center side end 33 toward the outer peripheral side end 32 by the blade portion 31. That is, a flow of air A2 from the center of the rotary atomizing head 14 toward the outer periphery is generated. As a result, the dirt of the paint dust P1 is prevented from adhering to the front end surface 11a of the coating machine body 11.

  The inventors of the present invention produced a rotary atomizing head 14 in which the length of the blade portion 31 was changed, and performed a confirmation test of the dirt prevention effect by the blade portion 31. Here, as shown in FIGS. 3 and 4, the position of the outer peripheral side end 32 is changed without changing the position of the center side end 33 of the blade part 31, and the length of the blade part 31 is changed. In this case, when the rotary atomizing head 14 is driven to rotate, the maximum diameter φd (the outer diameter of the blade portion 31) of the rotation locus of the outer peripheral side end 32 of the blade portion 31 changes.

  Specifically, a blade portion 31 having an outer diameter φd of 0.9 times the outer diameter φD of the rotary atomizing head 14 (Example 1), a blade having an outer diameter φd of 0.7 times A test for confirming the antifouling effect was performed using a part 31 formed (Example 2) and a part 31 formed with a blade part 31 having an outer diameter φd of 0.5 times (Comparative Example 1). The results are shown in Table 1. In addition, a confirmation test was also performed for Conventional Example 1 in which the blade portion 31 was not formed, and the results are shown in Table 1.

The amount of dirt adhered was evaluated visually at 6 levels (level 0 to level 5). Specifically, the level 0 is set when there is no dirt of the paint dust P1 on the front end surface 11a of the coating machine body 11. Further, when the dirt of the paint dust P1 adheres to only the outer peripheral portion (1/2 surface area) of the tip end surface 11a of the coating machine main body 11 (see FIG. 5), the entire surface of the tip end surface 11a of the coating machine main body 11 is level 3. When the dirt of the paint dust P1 adheres (see FIG. 6), the level 5 is set.

  As shown in Table 1, in Example 1 and Example 2, the amount of dirt adhered was less than half that of Conventional Example 1 (level 4) (level 2 or less), and it was confirmed that there was a dirt prevention effect. . On the other hand, in Comparative Example 1, since the size of the blade portion 31 was too small, the amount of dirt adhered was the same as that in Conventional Example 1, and the effect of preventing dirt could not be confirmed.

  Therefore, in the rotary atomizing head type coating machine 1 according to the present embodiment, the maximum diameter φd of the rotation trajectory of the outer peripheral end 32 when the rotary atomizing head 14 is rotationally driven is 0 of the outer diameter φD of the rotary atomizing head 14. The size of the blade portion 31 is set so as to have a dimension of 7 times to 0.9 times.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the rotary atomizing head type coating machine 1 of the present embodiment, the air A2 in the atmospheric pressure region is supplied to the back surface 26 side of the rotary atomizing head 14 via the communication path 25, so that the shaping air A1 is Even when ejected, the area on the back surface 26 side does not become negative pressure. Further, since the blade portion 31 is provided on the back surface 26 of the rotary atomizing head 14 and at the position closer to the central axis side of the rotary atomizing head 14 than the outer peripheral edge and the air outlet 21, the rotary atomizing is performed. As the head 14 rotates, air A <b> 2 flows from the center of the rotary atomizing head 14 toward the outer periphery by the blade portion 31. As a result, the paint dust P <b> 1 is prevented from entering the back surface 26 side of the rotary atomizing head 14. For this reason, the adhesion of dirt due to the paint dust P1 can be suppressed on the front end surface 11a of the coating machine body 11 and the back surface 26 of the rotary atomizing head 14. Further, the air A2 flowing from the center of the rotary atomizing head 14 to the outer periphery on the back surface 26 side of the rotary atomizing head 14 is supplied from the atmospheric pressure region in the robot arm 3 through the communication path 25 and includes the paint dust P1. There is no clean air. For this reason, even if the air A2 is mixed into the shaping air A1, the coating quality is not affected. Further, in the rotary atomizing head type coating machine 1, there is no need to use a dedicated air pump or the like in order to generate an air flow from the center of the rotary atomizing head 14 toward the outer periphery as in the conventional technique. For this reason, the installation cost and running cost of the rotary atomizing head type coating machine 1 can be kept low.

  (2) In the rotary atomizing head type coating machine 1 of the present embodiment, the inclination angle α1 with respect to the central axis O1 of the rotary atomizing head 14 is the maximum (70 °) on the back surface 26 of the rotary atomizing head 14. A long blade portion 31 is provided as an airflow generation portion in a portion (central region R1). By providing such a blade portion 31, it is possible to efficiently generate the flow of air A2 from the center of the rotary atomizing head 14 toward the outer periphery, and to reliably suppress the adhesion of dirt due to the paint dust P1. .

  (3) In the rotary atomizing head type coating machine 1 according to the present embodiment, the communication path 25 is opened at the rear position of the center side end 33 of the blade portion 31. Therefore, air A <b> 2 is supplied to the portion of the center side end 33 of the blade 31 on the back surface 26 side of the rotary atomizing head 14 through the communication path 25. The air A <b> 2 flows from the center side end 33 toward the outer peripheral side end 32 by the blade portion 31 as the rotary atomizing head 14 rotates. As a result, the flow of the air A2 from the center of the rotary atomizing head 14 toward the outer periphery can be reliably generated, and the adhesion of dirt due to the paint dust P1 can be suppressed.

  (4) In the rotary atomizing head type coating machine 1 of the present embodiment, the maximum diameter φd of the rotation locus of the outer peripheral side end 32 when the rotary atomizing head 14 is driven to rotate is the outer diameter φD of the rotary atomizing head 14. The size of the blade portion 31 is set so as to have a dimension of 0.7 times or more and 0.9 times or less. If it does in this way, the flow of the air A2 which goes to an outer periphery from the center of the rotary atomization head 14 can be generated with an exact air volume. As a result, the adhesion of dirt due to the paint dust P1 can be suppressed without deteriorating the coating quality.

  (5) In the rotary atomizing head type coating machine 1 of the present embodiment, since the blade portion 31 is provided integrally with the rotary atomizing head 14, centrifugal force is applied when the rotary atomizing head 14 is driven to rotate. Also, the problem that the blade 31 is detached from the rotary atomizing head 14 can be avoided.

  (6) In the rotary atomizing head type coating machine 1 of the present embodiment, since the two blade portions 31 are provided at positions facing each other across the central axis O1 of the rotary atomizing head 14, the rotary atomization is performed. It is possible to prevent the rotational balance of the head 14 from being lost. As a result, in the rotary atomizing head type coating machine 1, the rotary atomizing head 14 can be smoothly rotated, and coating can be performed while maintaining a good coating quality.

  (7) In the present embodiment, the blade portion 31 is provided in a state of protruding from the back surface 26 of the rotary atomizing head 14, so that the rotary atomizing head 14 is easily held when the blade portion 31 is used. For this reason, the cleaning operation etc. can be easily performed by holding the blade | wing part 31 by hand and performing the cleaning operation | work etc. of the rotary atomization head 14. FIG.

  In addition, you may change each embodiment of this invention as follows.

  In the rotary atomizing head type coating machine 1 of each embodiment described above, the back surface 26 of the rotary atomizing head 14 has the inclination angles α1, α2 with respect to the central region R1 with respect to the central axis O1 of the rotary atomizing head 14. It was formed differently in the outer region R2. On the other hand, as shown in FIGS. 7 to 9, the present invention may be applied to rotary atomizing heads 14 </ b> A, 14 </ b> B, 14 </ b> C having different shapes of the back surface 26. In the rotary atomizing heads 14A and 14B of FIGS. 7 and 8, the back surface 26 is formed so as to have the same inclination angle α1 from the central region to the outer region. Moreover, in the rotary atomizing head 14A of FIG. 7, the flat surface 41 parallel to the axial direction of the rotary atomizing head 14 is provided in the outer peripheral edge part. In the rotary atomizing head 14B of FIG. 8, the flat surface 41 is not provided, and the outer peripheral end portion has a sharp edge. Furthermore, in the rotary atomizing head 14 </ b> C of FIG. 9, the back surface 26 has a curved bowl shape. In these rotary atomizing heads 14A to 14C, as in the above-described embodiment, the blade portion 31 extends along the radial direction of the rotary atomizing head 14 on the back surface 26. In addition, each blade 31 is disposed on the back surface 26 at a position where the inclination angle α1 with respect to the central axis O1 of the rotary atomizing heads 14A to 14C is greater than 45 °. Furthermore, the maximum diameter φd of the rotation trajectory of the outer peripheral end 32 when the rotary atomizing heads 14A to 14C are rotationally driven is 0.7 times or more and 0.9 times or less the outer diameter φD of the rotary atomizing heads 14A to 14C. It is a dimension. Thus, by providing the blade | wing part 31 on the back surface 26 of each rotary atomization head 14A-14C, air A2 flows toward the outer periphery from the center of rotary atomization head 14A-14C, and rotation atomization head 14A ~. The coating dust P1 is prevented from entering the back surface 26 side of 14C. Therefore, adhesion of dirt due to the paint dust P1 can be suppressed on the front end surface 11a of the coating machine body 11 and the back surface 26 of the rotary atomizing heads 14A to 14C. In addition, since the rotary atomizing heads 14A to 14C are easily held by the blade portion 31, the cleaning operation and the like of the rotary atomizing heads 14A to 14C are facilitated. In particular, as in the case of the rotary atomizing head 14B in FIG. 8, when the outer peripheral end portion is a sharp edge, holding the blade portion 31 by hand instead of the outer peripheral end portion hurts the hand at the outer peripheral end portion. Cleaning operation can be performed efficiently.

  In the rotary atomizing head type coating machine 1 of the above-described embodiment, the two blade portions 31 are provided. However, the present invention is not limited to this, and three or more blade portions 31 may be provided. However, if the number of the blade portions 31 is increased too much, the weight of the rotary atomizing head 14 increases or the cleaning operation of the rotary atomizing head 14 becomes difficult. For this reason, it is preferable that the number of blade portions 31 be six or less.

  In the rotary atomizing head type coating machine 1 of the above embodiment, the communication path 25 communicates with the atmospheric pressure region in the robot arm 3, but is not limited to this. For example, the communication path 25 may be formed so as to communicate with the atmospheric pressure region outside the coating booth 4 via the interior of the coating machine main body 11 and the robot arm 3. Even in this way, clean air A2 that does not contain the paint dust P1 can be supplied to the back surface 26 side of the rotary atomizing head 14 through the communication path 25. Accordingly, it is possible to prevent dirt from adhering to the front end surface 11a of the coating machine body 11 without affecting the coating quality. In addition, an air filter is provided in the middle of the communication path 25 communicating with the atmospheric pressure area inside the robot arm 3 or in the middle of the communication path 25 communicating with the atmospheric pressure area outside the coating booth 4, and the air purified by the filter is rotated. You may comprise so that it may supply to the back surface 26 side of the atomization head 14. FIG.

  -In the rotary atomizing head type coating machine 1 of the said embodiment, although the blade | wing part 31 was provided as an airflow generation | occurrence | production part, it is not limited to this. A groove portion as an air flow generation site may be provided on the back surface 26 of the rotary atomizing head 14, and the flow of air A <b> 2 from the center of the rotary atomizing head 14 toward the outer periphery may be generated by the groove portion.

  -Although the rotary atomizing head type coating machine 1 of the said embodiment performed the coating of the motor vehicle body 2, you may perform the coating of components other than the motor vehicle body 2. FIG.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiments described above are listed below.

  (1) In any one of the means 2 to 6, a plurality of the blade portions are arranged so as to be rotationally symmetric.

  (2) The rotary atomizing head type coating machine according to any one of the means 2 to 6, wherein the number of the blade portions is 6 or less.

  (3) The rotary atomizing head type coating machine according to any one of the means 2 to 6, wherein the blade portion is integrally formed with the rotary atomizing head.

DESCRIPTION OF SYMBOLS 1 ... Rotary atomizing head type coating machine 3 ... Robot arm as a coating machine support body 4 ... Painting booth 11 ... Coating machine main body 14, 14A-14C ... Rotary atomizing head 21 ... Air ejection port 22 ... Constructing an air ejection means Air supply passage 23 ... Air supply source constituting the air ejection means 25 ... Communication passage 26 ... Back face 31 ... Blade part 32 as an air flow generation site 32 ... Outer end side 33 ... Center side end A1 ... Shaping air A2 ... Air O1 ... Central axis P0 ... Paint α1 ... Inclination angle φD ... Outer diameter of rotary atomizing head φd ... Maximum diameter of rotation trajectory at outer edge

Claims (6)

A sprayer body having an air motor inside and supported by a sprayer support;
A bell-type rotary atomizing head that is provided on the front end side of the coating machine main body, is rotationally driven by the air motor, and discharges paint from the front side;
It has an air jet opening that opens at the front end side of the coating machine main body and at a rear position of the outer peripheral edge of the rotary atomizing head, from the air outlet toward the periphery of the outer peripheral edge of the rotary atomizing head In a rotary atomizing head type coating machine equipped with air jetting means for jetting shaping air
A large inside of the coating machine support body is disposed on the tip side of the coating machine main body and at a position closer to the central axis side of the rotary atomizing head than the outer peripheral edge and the air outlet. A communication passage communicating with the atmospheric pressure region, or a communication passage communicating with the atmospheric pressure region outside the coating booth through the interior of the coating machine main body and the interior of the coating machine support is formed,
When the rotary atomizing head is driven to rotate, the rotary atomizing head is positioned on the back surface of the rotary atomizing head and closer to the central axis side of the rotary atomizing head than the outer peripheral edge and the air jet port. The rotary atomizing head type coating machine is provided with an air flow generating portion for generating an air flow from the center of the rotary atomizing head toward the outer periphery along the back surface of the rotary atomizing head.   2. The rotary atomization according to claim 1, wherein the air flow generation site is a plurality of elongated blade portions extending along a radial direction of the rotary atomizing head on the back surface. Head type painting machine.   The rotary atomizing head type coating machine according to claim 2, wherein the blade portion is disposed on the back surface at a portion where an inclination angle with respect to a central axis of the rotary atomizing head is maximized. .   3. The rotary atomizing head type according to claim 2, wherein the blade portion is disposed at a portion where an inclination angle with respect to a central axis of the rotary atomizing head is greater than 45 ° on the back surface. Painting machine.   The said blade | wing part has an outer peripheral side end and a center side end, and the said communicating path is opened in the back position of the said center side end of the said blade | wing part. A rotary atomizing head type coating machine according to item 1.   The blade portion has an outer peripheral side end and a central side end, and the maximum diameter of the rotation trajectory of the outer peripheral side end during rotation of the rotary atomizing head is 0.7 of the outer diameter of the rotary atomizing head. The rotary atomizing head type coating machine according to any one of claims 2 to 5, which has a size of not less than twice and not more than 0.9 times.

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