Nozzle for powder coating

Abstract

Provided is a powder coating nozzle capable of suppressing missed coating of a powder coating material and unevenness in film thickness of the powder coating material while improving versatility. A powder coating nozzle (1) capable of coating an object to be coated, which is an object to be coated, by discharging a supplied powder coating material, is provided with: a long nozzle part (3) for supplying the powder coating material from one end toward the other end; a plurality of discharge holes (4) which are formed on the other end side of the nozzle part (3) so as to face different directions from each other and discharge the powder coating supplied to the nozzle part (3); and a sleeve (5) which is provided inside the nozzle part (3) and is formed so as to be movable inside the nozzle part (3), in which a through-hole (8) is formed, said through-hole (8) being capable of selectively connecting one of the plurality of discharge holes (4) to the inside of the nozzle part (3) by moving the sleeve (5).

Description

Technical Field

[0001] This invention relates to a powder coating nozzle for applying powder coating to car bodies and the like. Background Technology

[0002] Patent Document 1 discloses a powder coating apparatus for powder coating the inner surface of a cylindrical tube. The apparatus of Patent Document 1 includes: a support tube with an outer diameter smaller than the inner diameter of the tube to be coated; an air motor disposed at the front end of the support tube; a spray nozzle fixed to the front end of the rotating shaft of the air motor; and a powder coating delivery pipe extending through the interior of the support tube, with one end opening into the interior of the spray nozzle. The spray nozzle is formed as a cone with a diameter decreasing as it moves towards the front end opposite to the air motor. Furthermore, a plurality of spray holes opening towards the front end of the spray nozzle are formed on the outer peripheral wall of the spray nozzle. In the apparatus of Patent Document 1, the tube to be coated moves toward the spray nozzle and the support tube formed in this manner, with the support tube entering the interior of the tube to be coated. In this state, powder coating is supplied to the spray nozzle from a powder coating supply tank connected to the powder coating delivery pipe via pneumatic conveying, and the air motor operates, causing the spray nozzle to rotate. Thus, the powder coating is ejected from the nozzle by the supply pressure when the powder coating is supplied from the powder coating delivery pipe to the spray nozzle, and by the centrifugal force generated by the rotation of the spray nozzle. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 60-5253 Summary of the Invention The problem that the invention aims to solve

[0004] In Patent Document 1, the aforementioned structure allows for reliable adhesion of powder coating to the inner surface of the tube being coated, and enables the formation of a uniformly thick coating film across the entire surface. However, Patent Document 1 requires the powder coating apparatus to enter the interior or move along the axial direction of the powder coating apparatus. If the component does not have an insertion hole of the size and shape that enables this, coating cannot be performed, limiting the number of components that can be coated.

[0005] On the other hand, in the absence of an insertion hole into which such a powder coating apparatus can be inserted, for example, one could consider simply inserting the spray nozzle of the powder coating apparatus into the object to be coated. However, in the powder coating apparatus of Patent Document 1, depending on the distance and angle between the spray nozzle and the object to be coated, or the size and angle of the spray nozzle's outlet, there may be areas where the powder coating is difficult to adhere to the object. Thus, in the powder coating apparatus of Patent Document 1, there is a possibility that the places and components where coating can be performed are limited.

[0006] This invention was made in view of the above-mentioned technical problems. Its purpose is to provide a nozzle for powder coating, which can improve versatility and suppress powder coating omissions and uneven film thickness when coating objects with powder coating. Technical means for solving the problem

[0007] To achieve the above objective, the present invention provides a powder coating nozzle capable of coating an object by discharging supplied powder coating material. The powder coating nozzle is characterized by comprising: an elongated nozzle portion that supplies the powder coating material from one end toward the other; a plurality of discharge holes formed at the other end of the nozzle portion in different orientations to discharge the powder coating material supplied to the nozzle portion; and a sleeve disposed inside the nozzle portion and configured to move within the nozzle portion. A through hole is formed in the sleeve, and by moving the sleeve, the through hole selectively connects one of the plurality of discharge holes to the interior of the nozzle portion.

[0008] Alternatively, in this invention, an operating unit may also be included, which is connected to the sleeve in a manner that allows the sleeve to move, and can select the discharge hole that is connected to the interior of the nozzle portion through the through hole.

[0009] Alternatively, the plurality of discharge holes in the present invention may have at least a plurality of predetermined discharge holes arranged along the length direction of the nozzle portion. The predetermined discharge holes are formed by penetrating the nozzle portion at angles that are different from each other relative to the length direction. The sleeve is formed to be movable inside the nozzle portion along the length direction. The through hole is formed such that the position of the through hole coincides with the position of one of the predetermined discharge holes in the plurality of predetermined discharge holes, thereby connecting the interior of the nozzle portion with one of the predetermined discharge holes.

[0010] Alternatively, in this invention, a plurality of prescribed discharge holes are arranged along the short side direction of the nozzle portion, and adjacent prescribed discharge holes in the short side direction are formed such that their angles relative to the length direction are the same. The through hole is configured to allow the plurality of prescribed discharge holes arranged along the short side direction to simultaneously connect with the interior of the nozzle portion.

[0011] Alternatively, the nozzle portion in this invention can be formed as a cylinder, and the sleeve can be formed as a cylinder extending through the inner surface of the nozzle portion. The powder coating passes through the interior of the sleeve and is discharged from one of the discharge holes via the through hole. The sleeve and the plurality of discharge holes are formed such that the sum of the cross-sectional areas of adjacent discharge holes in the short side direction is equal to the cross-sectional area of ​​the flow path through which the powder coating passes inside the sleeve. Invention Effects

[0012] In the powder coating nozzle of the embodiment of the present invention, a plurality of discharge holes for discharging powder coating are formed in the nozzle portion. The plurality of discharge holes are formed in different orientations. Inside the nozzle portion, a sleeve movable inside the nozzle portion is provided, and a through hole is formed in the sleeve to selectively connect one of the plurality of discharge holes to the inside of the nozzle portion. Therefore, by moving the sleeve, powder coating can be discharged from the selected discharge hole. In addition, since the plurality of discharge holes are formed in different orientations, powder coating can be discharged in a desired direction. For example, in the case where discharge holes are formed in the length direction of the nozzle portion and discharge holes are formed in the short side direction of the nozzle portion, by selectively connecting the discharge holes using the through hole, powder coating can be discharged in either the length direction or the short side direction of the nozzle portion. That is, the direction of powder coating discharge can be adjusted simply by moving the sleeve. Therefore, when coating an object with powder coating, it is possible to prevent or suppress the occurrence of powder coating omissions and uneven powder coating film thickness. Furthermore, since powder coating can be applied by inserting the nozzle into the object being coated, the limitation of the object being coated can be prevented. In other words, since the shape of the parts other than the nozzle can be freely set, powder coating can be applied to various objects by reducing the size of the nozzle or freely setting the number and orientation of the discharge holes.

[0013] In addition, an operating unit is provided, which is connected to the sleeve in a manner that allows the sleeve to move and adjust the position of the through hole. Therefore, the movement of the sleeve can be made easy, thereby making it easy to change the discharge direction.

[0014] Furthermore, the multiple discharge holes have multiple predetermined discharge holes arranged along the length direction of the nozzle section, and the predetermined discharge holes have different angles relative to each other in the length direction. Moreover, by moving the sleeve inside the nozzle section along the length direction, the position of the through hole is aligned with the position of a predetermined discharge hole, thereby connecting the interior of the nozzle section with a predetermined discharge hole. In other words, by moving the sleeve along the length direction of the nozzle section, the discharge hole for discharging powder coating can be selected, thus allowing for easy change of the powder coating discharge direction.

[0015] Furthermore, multiple discharge holes are arranged along the short side of the nozzle section, and the angles of these multiple discharge holes relative to the length direction are the same for all of them. Moreover, these multiple discharge holes arranged along the short side are configured to connect simultaneously to the interior of the nozzle section through through holes. Therefore, powder coating can be discharged over a wide area along the short side of the nozzle section.

[0016] Furthermore, the nozzle section is formed into a cylindrical shape, and the powder coating is supplied into the cylindrical sleeve that penetrates the interior of the nozzle section. The powder coating is then discharged from the inside of the sleeve through a through-hole and a discharge port. The sleeve and the plurality of discharge ports are configured such that the sum of the cross-sectional areas of adjacent discharge ports along the short side of the nozzle section is equal to the cross-sectional area of ​​the flow path of the sleeve. Therefore, the powder coating supplied to the inside of the nozzle section can be smoothly discharged from the discharge port. Attached Figure Description

[0017] Figure 1 This is an overall diagram illustrating an example of the overall structure of a powder coating nozzle in an embodiment of the present invention. Figure 2 This is a cross-sectional view used to illustrate the discharge amount and direction of powder coating at each discharge hole corresponding to the spacing between the cover and the front end. Figure 2 (a) is a cross-sectional view showing the through hole connected to the first discharge hole. Figure 2 (b) is a cross-sectional view showing the case where the through hole is connected to the second discharge hole. Figure 2 (c) is a cross-sectional view showing the connection between the through hole and the third discharge hole. Figure 2 (d) is a cross-sectional view of the case where the through hole is connected to the fourth discharge hole. Figure 3 This is an explanatory diagram illustrating an example of coating an object using a powder coating nozzle according to an embodiment of the present invention. Figure 4 It is used for applying powder coating through a nozzle. Figure 3 The diagram illustrates the coating process on the object shown. Figure 5 This is an explanatory diagram used to illustrate another example of coating an object using a powder coating nozzle according to an embodiment of the present invention. Figure 5 (a) is an explanatory diagram showing an example of coating a powder coating nozzle being inserted into the side of the object being coated. Figure 5 (b) is an illustrative diagram showing an example of coating the inner surface of a bent object. Detailed Implementation

[0018] The present invention will now be described based on the illustrated embodiments. Furthermore, the embodiments described below are merely examples of how the present invention is embodied and do not constitute a limitation thereof.

[0019] The powder coating nozzle 1 in this embodiment of the invention is used for vehicle body painting in places such as vehicle manufacturing sites. Rust prevention treatment is applied to the vehicle body not only on the outer surface but also on the inner side to prevent rusting caused by infiltrating rainwater or the like. This rust prevention treatment can be performed using powder coating. The powder coating nozzle 1 is used when spraying the supplied powder coating onto the vehicle body. Figure 1 and Figure 2 An example of this powder coating nozzle 1 is shown. For example... Figure 1 and Figure 2 As shown, the powder coating nozzle 1 mainly comprises a main body 2, a nozzle 3, a discharge hole 4, a sleeve 5, and a rod 66.

[0020] Furthermore, the device for supplying powder coating material to the powder coating nozzle 1 can be a conventionally known device. Although not shown in the figures, this powder coating material supply device can be configured to supply powder coating material to the powder coating nozzle 1 using a hopper for storing and agitating powder coating material, a feeder for supplying powder coating material by adjusting the supply amount from the hopper, and a pipeline for moving the powder coating material supplied from the feeder by air pressure from an air pump. In this way, the powder coating material supplied from the device is discharged from the powder coating nozzle 1 while charged by the electrostatic spray gun. In addition, the powder coating material supply device is configured to be able to change the speed at which the powder coating material is supplied to the powder coating nozzle 1 by changing the intensity of the supplied air pressure.

[0021] like Figure 1 As shown, the main body 2 is formed into a long cylindrical shape along its central axis, and is designed to allow powder coating to pass through its interior. Therefore, the aforementioned powder coating supply device (not shown) is connected to one end of the main body 2. Additionally, a switching section 7 is formed at one end of the main body 2. Figure 1As shown, the switching part 7 has a step extending through the main body part 2 and along the central axis, namely four engaging grooves 7a, 7b, 7c, and 7d. Starting from the side closest to the nozzle part 3, the engaging grooves 7a, 7b, 7c, and 7d are sequentially the first engaging groove 7a, the second engaging groove 7b, the third engaging groove 7c, and the fourth engaging groove 7d. The rod part 6, described later, selectively engages with each of the engaging grooves 7a, 7b, 7c, and 7d. That is, by pressing the rod part 6 towards the end of the main body part 2 in the axial direction and moving the rod part 6 laterally along the short side of the main body part 2, the engaging grooves 7a, 7b, 7c, and 7d engaged by the rod part 6 are switched. Furthermore, although not shown in the figure, four engaging grooves 7a, 7b, 7c, and 7d are also formed on the opposite side across the central axis of the main body part 2. Furthermore, the detailed shapes of the four engaging slots 7a, 7b, 7c, and 7d will be described later in conjunction with the rod portion 6. Additionally, the inner surface of the main body 2 is configured to allow the powder coating material, already charged inside the electrostatic spray gun, to pass through while maintaining its charged state.

[0022] like Figure 1 and Figure 2 As shown, the nozzle part 3 is a cylindrical component with a closed end, integrated with the other end of the main body part 2. One end of the nozzle part 3 in the axial direction, i.e., the front end, is formed into a closed shape. The interior of the nozzle part 3 is connected to the interior of the main body part 2, and powder coating is supplied to the nozzle part 3 via the main body part 2.

[0023] like Figure 1 and Figure 2 As shown, the discharge holes 4 are multiple rectangular holes that penetrate the nozzle portion 3 in the thickness direction of the plate. Multiple discharge holes 4 are formed at predetermined intervals along both the circumferential and axial directions of the nozzle portion 3. Furthermore, adjacent discharge holes 4 formed in the circumferential direction of the nozzle portion 3 have the same cross-sectional area and orientation (penetration direction). On the other hand, adjacent discharge holes 4 formed in the axial direction of the nozzle portion 3 have different cross-sectional areas and orientations.

[0024] The first discharge hole 4a, which is formed at the foremost end of the nozzle portion 3 among the adjacent discharge holes 4 formed in the axial direction, is formed through a direction slightly inclined relative to the central axis of the nozzle portion 3. That is, as Figure 2As shown, the first inclination angle (discharge angle) θ1 formed by the line extending from the center of the first discharge hole 4a toward or through the center of the first discharge hole 4a and the line extending along the central axis of the nozzle portion 3 toward the front end of the nozzle portion 3 is called a sharp angle. That is, the first discharge hole 4a is formed by extending through in an inclination toward the front end of the nozzle portion 3. In addition, four first discharge holes 4a are formed, and they are formed such that the angles they form with each other in the circumferential direction of the nozzle portion 3 are approximately right angles. That is, the four third discharge holes 4c are formed in the circumferential direction of the nozzle portion 3 at positions staggered by 90°.

[0025] In the axial direction, a plurality of second discharge holes 4b, which are adjacent to the first discharge hole 4a, are formed to penetrate in a direction that is more inclined relative to the central axis of the nozzle portion 3 than the first discharge hole 4a. That is, as Figure 2 As shown, the second inclination angle (discharge angle) θ2 formed by the line extending from the center of the second discharge hole 4b toward or through the center of the second discharge hole 4b and the line extending along the central axis of the nozzle portion 3 toward the front end of the nozzle portion 3 is larger than the first inclination angle θ1. That is, the second discharge hole 4b is oriented in a direction orthogonal to the central axis, and the second inclination angle is approximately right angle. Furthermore, the number of second discharge holes 4b is less than the number of first discharge holes 4a, and the cross-sectional area of ​​each second discharge hole 4b is larger than the cross-sectional area of ​​each first discharge hole 4a. In addition, two second discharge holes 4b are formed at positions opposite each other across the central axis of the nozzle portion 3. Furthermore, these two second discharge holes 4b are formed at positions that overlap with any two of the four first discharge holes 4a in the axial direction.

[0026] A plurality of third discharge holes 4c, which are adjacent to the second discharge hole 4b in the axial direction, are formed to penetrate in the same direction as the second discharge hole 4b relative to the central axis of the nozzle portion 3. That is, as Figure 2As shown, the third inclination angle (discharge angle) θ3 formed by the line from the center of the second discharge hole 4b in the direction of penetration of the second discharge hole 4b to the line extending along the central axis of the nozzle portion 3 towards the front end of the nozzle portion 3 is approximately the same as the second inclination angle θ2. Therefore, the third discharge hole 4c, like the second discharge hole 4b, is oriented in a direction orthogonal to the central axis, and the third inclination angle θ3 is approximately right angle. Furthermore, the number of third discharge holes 4c is greater than the number of second discharge holes 4b, and the cross-sectional area of ​​each third discharge hole 4c is smaller than the cross-sectional area of ​​each second discharge hole 4b. Four third discharge holes 4c are formed, and they are formed such that the angles they form with each other in the circumferential direction of the nozzle portion 3 are approximately right angles. That is, the four third discharge holes 4c are formed in the circumferential direction of the nozzle portion 3 at positions staggered by 90°. In addition, these four third discharge holes 4c are formed at positions overlapping with the four first discharge holes 4a in the axial direction.

[0027] Furthermore, the fourth discharge hole 4d, which is adjacent to the third discharge hole 4c in the adjacent discharge holes 4 formed in the axial direction, is formed through a direction that is more inclined relative to the central axis of the nozzle portion 3 than the second discharge hole 4b and the third discharge hole 4c. That is to say, as Figure 2 As shown, the fourth inclination angle (discharge angle) θ4 formed by the line from the center of the third discharge hole 4c toward or through the center of the third discharge hole 4c and the line extending along the central axis of the nozzle portion 3 toward the front end of the nozzle portion 3 is an obtuse angle larger than the second inclination angle θ2 and the third inclination angle θ3. Therefore, the fourth discharge hole 4d is formed to extend through from the nozzle portion 3 toward the main body portion 2 at an inclination. The cross-sectional area of ​​each of the fourth discharge holes 4d is approximately the same as the cross-sectional area of ​​each of the first discharge holes 4a, and the size of the opening of the fourth discharge hole 4d is approximately the same as the size of the opening of the first discharge hole 4a. In addition, four fourth discharge holes 4d are formed, and the angles they form with each other in the circumferential direction of the nozzle portion 3 are approximately right angles. That is, the four fourth discharge holes 4d are formed in the circumferential direction of the nozzle portion 3 at positions that are staggered by 90°. Furthermore, these four fourth discharge holes 4d are formed at positions that overlap with the four first discharge holes 4a and the four third discharge holes 4c in the axial direction. That is, the nozzle part 3 is provided with a portion in which no discharge holes 4a, 4b, 4c, 4d are formed in the axial direction.

[0028] That is, regarding the orientation of each discharge hole 4a, 4b, 4c, 4d relative to the central axis of the main body 2 and the nozzle part 3, or the inclination angle of the line passing through the center in the through direction of each discharge hole 4a, 4b, 4c, 4d, the first inclination angle θ1 is the smallest, followed by the second inclination angle θ2, the third inclination angle θ3, and the fourth inclination angle θ4, which increase in the following order (θ1 < θ2 = θ3 < θ4). On the other hand, the sum of the cross-sectional areas of each discharge hole 4a, 4b, 4c, 4d is equal to each other. For example, the first total cross-sectional area D1 obtained by adding the cross-sectional areas of each of the multiple first discharge holes 4a is equal to the second total cross-sectional area D2 obtained by adding the cross-sectional areas of each of the multiple second discharge holes 4b. Similarly, the third total cross-sectional area D3 obtained by adding the cross-sectional areas of each of the multiple third discharge holes 4c and the fourth total cross-sectional area D4 obtained by adding the cross-sectional areas of each of the multiple fourth discharge holes 4d are also equal to the first total cross-sectional area D1 and the second total cross-sectional area D1 (D1 = D2 = D3 = D4). Because of this configuration, the powder coating is discharged in a direction corresponding to the orientation of each discharge hole 4a, 4b, 4c, 4d, and the amount of powder coating discharged is approximately equal at each discharge hole 4a, 4b, 4c, 4d. Furthermore, the first discharge angle θ1, the second discharge angle θ2, the third discharge angle θ3, and the fourth discharge angle θ4 correspond to angles relative to the length direction in embodiments of the present invention.

[0029] Furthermore, the angles of each discharge hole 4a, 4b, 4c, and 4d arranged in the axial direction relative to the central axis can be significantly different from each other. Additionally, the multiple discharge holes 4 arranged in the circumferential direction can also be slightly different from each other relative to the central axis. For example, the angle of one of the multiple first discharge holes 4a arranged in the circumferential direction can be formed to be smaller than the angles of the other first discharge holes 4a. By forming it in this way, a larger area of ​​powder coating can be discharged. Furthermore, the number, angle, size, etc., of the aforementioned discharge holes 4a, 4b, 4c, and 4d can be appropriately set according to the characteristics of the powder coating, the speed (flow rate) at which the powder coating is supplied, the shape of the object being coated, etc.

[0030] like Figure 2 As shown, the sleeve 5 is a cylindrical component that extends through the interior of the main body 2 and the nozzle 3, and is formed along the central axis of the nozzle 3. The outer surface of the sleeve 5 abuts against the inner surface of the nozzle 3, and the outer surface of the sleeve 5 is mounted so as to be able to slide on the inner surface of the nozzle 3. That is to say, the powder coating supplied from the main body 2 to the nozzle 3 passes through the interior of the sleeve 5.

[0031] Furthermore, a through hole 8 is formed at one end of the sleeve 5, specifically at the nozzle portion 3. Multiple through holes 8 are arranged along the circumference of the sleeve 5, each corresponding to a plurality of discharge holes 4. That is, when the position of the through hole 8 in the height direction coincides with the position of one of the discharge holes 4a, 4b, 4c, and 4d, that coinciding discharge hole 4 is connected to the interior of the sleeve 5. Therefore, the powder coating is discharged directly or after contact with the front end of the sleeve 5 through the through hole 8 from one of the discharge holes 4: the first discharge hole 4a, the second discharge hole 4b, the third discharge hole 4c, and the fourth discharge hole 4d.

[0032] Furthermore, the cross-sectional area inside the sleeve 5, i.e., the flow path cross-sectional area D0, is approximately equal to the total cross-sectional areas D1, D2, D3, and D4 of each of the discharge holes 4a, 4b, 4c, and 4d (D0 = D1 = D2 = D3 = D4). In other words, the cross-sectional areas D1, D2, D3, and D4 of a particular discharge hole 4a, 4b, 4c, or 4d that is simultaneously open through the through hole 8 are approximately equal to the flow path cross-sectional area D0 of the nozzle. Therefore, the powder coating supplied to the sleeve 5 can be smoothly discharged from a particular discharge hole 4a, 4b, 4c, or 4d.

[0033] For example, when the through hole 8 and the plurality of first discharge holes 4a are aligned in the height direction, all of the plurality of first discharge holes 4a are connected to the interior of the sleeve 5. Similarly, when the through hole 8 and the plurality of second discharge holes 4b are aligned in the height direction, all of the plurality of second discharge holes 4b are connected to the interior of the sleeve 5. In other words, by aligning the through hole 8 with a particular discharge hole 4a, 4b, 4c, or 4d, and connecting that particular discharge hole 4a, 4b, 4c, or 4d to the interior of the sleeve 5, powder coating can be discharged from that particular discharge hole 4a, 4b, 4c, or 4d. Furthermore, the through hole 8 is formed such that a selected type of discharge hole 4a, 4b, 4c, or 4d arranged along the axial direction is fully open.

[0034] For example, when the through hole 8 is located at the same position as one of the discharge holes 4a, 4b, 4c, or 4d in the axial direction, a through hole 8 is formed at the same position as that discharge hole 4a, 4b, 4c, or 4d. In this case, the number and shape of the through holes 8 are set such that all discharge holes 4a, 4b, 4c, or 4d are fully open. For example, since there are four discharge holes 4a, 4c, and 4d, the number of through holes 8 is also set to four. Furthermore, the opening of the second discharge hole 4b is formed to be the longest in the axial direction, and the opening of the third discharge hole 4c is formed to be the longest in the circumferential direction. Therefore, the opening of the through hole 8 is longer than that of the second discharge hole 4b in the axial direction and longer than that of the third discharge hole 4c in the circumferential direction. Additionally, through holes formed at positions not corresponding to the second discharge hole 4b can also be formed to have the same length in the axial direction as the opening of the first discharge hole 4a or the opening of the fourth discharge hole 4d.

[0035] By forming the through hole 8 in this way, the discharge holes 4a, 4b, 4c, and 4d can all discharge powder coating without any residue. Furthermore, as described above, since each nozzle portion 3 has a portion that does not overlap with each discharge hole 4a, 4b, 4c, and 4d in the axial direction, the through hole 8 can be formed in a manner corresponding to each discharge hole 4a, 4b, 4c, and 4d. Thus, the powder coating supplied from the main body portion 2 passes through the interior of the sleeve 5 and is discharged through the through hole 8 from one of the discharge holes 4a, 4b, 4c, and 4d.

[0036] The rod portion 6 is a rod-shaped component integrated with the other end of the sleeve 5. The rod portion 6 extends from the end of the sleeve 5 opposite to the through hole 8 in a direction orthogonal to the sleeve 5, passes through the switching portion 7 of the main body 2, and protrudes. As described above, a step along the central axis, i.e., a plurality of engaging grooves 7a, 7b, 7c, and 7d, is formed in the switching portion 7. By engaging the rod portion 6 with one of these engaging grooves 7a, 7b, 7c, and 7d, the movement of the sleeve 5 in the axial direction is restricted. Furthermore, the rod portion 6 corresponds to the operating portion in the embodiment of the present invention.

[0037] In this way, the sleeve 5 and the rod 6 operate as a single unit, configured to adjust the position of the through hole 8 relative to each discharge hole 4a, 4b, 4c, 4d. The engaging grooves 7a, 7b, 7c, 7d are formed in a manner that alternates and is staggered in the circumferential direction of the main body 2. Therefore, by pressing the rod 6 towards the main body 2 and sliding it along the circumferential direction of the main body 2, the engaging grooves 7a, 7b, 7c, 7d of the rod 6 can be selected. Figure 1 and Figure 2As shown, when the rod portion 6 engages with the first engaging groove 7a, which is formed on the side closest to the nozzle portion 3, among the four engaging grooves 7a, 7b, 7c, and 7d, the positions of the plurality of first discharge holes 4a coincide with the positions of the through holes 8. That is, since the interior of the sleeve 5 is connected to the first discharge hole 4a, powder coating can be discharged from the first discharge hole 4a.

[0038] When the rod 6 engages with the second engaging groove 7b, which is adjacent to the first engaging groove 7a, among the four engaging grooves 7a, 7b, 7c, and 7d, the positions of the plurality of second discharge holes 4b coincide with the positions of the through holes 8. That is, since the interior of the sleeve 5 is connected to the second discharge hole 4b, powder coating can be discharged from the second discharge hole 4b. Similarly, when the rod 6 engages with the third engaging groove 7c, which is adjacent to the second engaging groove 7b, the positions of the plurality of third discharge holes 4c coincide with the positions of the through holes 8, and therefore, powder coating can be discharged from the third discharge holes 4c. Likewise, when the rod 6 engages with the fourth engaging groove 7d, which is adjacent to the third engaging groove 7c, the positions of the plurality of fourth discharge holes 4d coincide with the positions of the through holes 8, and therefore, powder coating can be discharged from the fourth discharge holes 4d.

[0039] When the rod 6 is engaged with the first engaging groove 7a, such as Figure 2 As shown, powder coating is discharged only from the first discharge hole 4a. Since the first discharge hole 4a passes through the nozzle section 3 at an angle towards the front end as described above, the powder coating is discharged along the axial direction toward the front end of the nozzle section 3.

[0040] When the rod 6 is engaged with the second engaging slot 7b, such as Figure 2 As shown, powder coating is discharged only from the second discharge hole 4b. Since the second discharge hole 4b penetrates the nozzle 3 in a direction orthogonal to the axis of the nozzle 3, as described above, the powder coating is discharged in a direction orthogonal to the axis. Furthermore, two second discharge holes 4b are formed opposite each other, separated by the central axis of the nozzle 3, as described above. Moreover, the circumferential length of the second discharge hole 4b is slightly shorter than that of the third discharge hole 4c, while its axial length is longer. Therefore, compared to the third discharge hole 4c, the second discharge hole 4b can discharge powder coating to a farther location.

[0041] When the rod 6 is engaged with the third engaging groove 7c, such as Figure 2As shown, powder coating is discharged only from the third discharge hole 4c. Since the third discharge hole 4c penetrates the nozzle portion 3 in a direction orthogonal to the axial direction of the nozzle portion 3, as described above, the powder coating is discharged in a direction orthogonal to the axial direction. Furthermore, as described above, four third discharge holes 4c are formed at approximately equal intervals along the circumference of the nozzle portion 3. Moreover, the circumferential length of the third discharge hole 4c is longer than that of the second discharge hole 4b, and its axial length is also longer than that of the second discharge hole 4b. Therefore, compared to the second discharge hole 4b, the third discharge hole 4c can discharge powder coating closer to the nozzle portion 3.

[0042] When the rod 6 is engaged with the fourth engaging slot 7d, such as Figure 2 As shown, powder coating is discharged only from the fourth discharge hole 4d. Since the fourth discharge hole 4d passes through the nozzle section 3 at an angle towards the main body section 2 as described above, the powder coating is discharged along the axial direction toward the end side of the nozzle section 3.

[0043] Next, refer to Figure 3 and Figure 4 An example will be described where a rectangular and elongated hollow first object component 9, which is the object to be coated, is coated using a powder coating nozzle 1 configured as described above. Figure 3 and Figure 4 In the example shown, the powder coating nozzle 1 is inserted into the lower surface of the first object part 9 to coat the inner surface of the first object part 9. The order of powder coating is as follows: Figure 4 As shown, the sequence is the upper surface, the upper part of the side surface, the lower part of the side surface, and the lower surface of the first object component. On the lower surface of the first object component 9, a plurality of through holes 10 are formed at predetermined intervals along the length direction. (See diagram below.) Figure 4 As shown, the powder coating nozzle 1 is inserted through the through hole 10. In this state, the operating lever 6 engages with the first engaging groove 7a, thereby aligning the position of the through hole 8 with the position of the first discharge hole 4a. By supplying powder coating material into the nozzle section 3, i.e., the inside of the sleeve 5, in this state, the powder coating material is discharged axially, that is, centered on the top of the nozzle section 3. Thus, the inner upper surface of the first target component 9 is coated. Furthermore, in Figure 4 For ease of explanation, the front side of the first object component 9 is omitted from the illustration.

[0044] After coating the upper surface of the interior of the first object component 9, the rod 6 is engaged with the second engaging groove 7b. This aligns the position of the through hole 8 with the position of the second discharge hole 4b. By supplying powder coating into the interior of the sleeve 5 in this state, the powder coating is discharged in a direction orthogonal to the axial direction, that is, centered on the side of the nozzle 3. At this time, the second discharge hole 4b can discharge the powder coating to a relatively distant location. Therefore, as... Figure 4 As shown, it is possible to coat the side of the inner side of the first object component 9 that is farther away from the nozzle part 3.

[0045] Inside the first component 9, after coating the side portion farther from the nozzle 3, the rod 6 engages with the third engaging groove 7c. This aligns the position of the through hole 8 with the position of the third discharge hole 4c. When powder coating is supplied into the sleeve 5 in this state, the powder coating is discharged in a direction orthogonal to the axis, that is, centered on the side of the nozzle 3. At this time, the third discharge hole 4c can discharge powder coating over a wide area to a nearby location. Therefore, as... Figure 4 As shown, it is possible to uniformly coat the side of the inner side of the first object component 9 that is closer to the nozzle part 3.

[0046] Finally, after coating the inner side of the first object part 9, the rod 6 is engaged with the fourth engagement groove 7d. This aligns the position of the through hole 8 with the position of the fourth discharge hole 4d. In this state, powder coating is supplied to the inside of the sleeve 5, and the powder coating is discharged with the main body side of the nozzle part 3, that is, the bottom, as the center. This allows coating of the lower surface of the first object part 9.

[0047] Furthermore, the powder coating nozzle 1 only needs to be able to insert the nozzle portion 3 into the inner surface of the target part; therefore, the direction in which the nozzle portion 3 is inserted is not limited to upwards. For example, in... Figure 5 As shown in (a), coating can also be performed even when the insertion hole 10 is formed on the side. That is, it can also be configured such that the nozzle part 3 is inserted through the insertion hole 10 formed on the side to coat the inner surface of the second target part 11.

[0048] Or, even if Figure 5 As shown in (b), the third object component 12, which is formed as an integrally bent cylindrical shape, can also be coated using the powder coating nozzle 1. That is, it can also be configured such that the nozzle part 3 is inserted into one of the openings of the third object component 12 to coat the inner surface of the third object component 12.

[0049] According to the powder coating nozzle 1 configured in this way, a plurality of discharge holes 4 are formed in a circumferential direction and an axial direction along the nozzle portion 3. The plurality of discharge holes 4 arranged in the circumferential direction are configured to have the same shape in terms of cross-sectional area, orientation (through direction), etc. The plurality of discharge holes 4 arranged in the axial direction are configured to have different shapes in terms of cross-sectional area, orientation (through direction), etc. For example, the first discharge hole 4a formed on the front end side of the nozzle portion 3 is formed in an inclined manner toward the front end side of the nozzle portion 3, which can discharge powder coating towards the front end side of the nozzle portion 3. On the other hand, the fourth discharge hole 4d formed on the main body portion 2 side of the nozzle portion 3 is formed in an inclined manner toward the main body portion 2, which can discharge powder coating towards the main body portion 2.

[0050] Furthermore, a cylindrical sleeve 5 is provided inside the nozzle section 3, sliding on the inner surface of the nozzle section 3. At one end of the sleeve 5, there is a through hole 8 that connects one of the plurality of discharge holes 4 arranged along the axial direction to the interior of the sleeve 5. That is, by moving the through hole 8 along the axial direction, powder coating can be selectively discharged from a particular discharge hole 4. As described above, since the orientation and cross-sectional area of ​​each discharge hole 4a, 4b, 4c, 4d arranged along the axial direction are different, by aligning the through hole 8 with a particular discharge hole 4a, 4b, 4c, 4d according to the desired discharge direction, powder coating can be applied over a large area.

[0051] Therefore, when coating an object with powder coating, it is possible to prevent or suppress missed areas and uneven film thickness of the powder coating. Furthermore, by simply inserting the nozzle 3 into the interior of the object being coated, powder coating can be applied evenly over a large area, thus preventing situations where the object being coated is restricted. Moreover, since the discharge direction of the powder coating can be changed via the rod 6 and the switching part 7, the nozzle 3 can be reduced in size, or the number and orientation of the discharge holes 4a, 4b, 4c, and 4d can be increased. In other words, it is not necessary to increase the cross-sectional area of ​​the nozzle 3 or finely adjust the orientation of the discharge holes 4a, 4b, 4c, and 4d according to the supply amount and speed of the powder coating to achieve even discharge over a large area; therefore, miniaturization and versatility can be improved.

[0052] The embodiments of the present invention have been described above, but the present invention is not limited to the above examples, and appropriate modifications can be made within the scope of achieving the purpose of the present invention. For example, the number of discharge holes 4 arranged in the circumferential direction is not limited to multiple as described above, and may also be one. That is, as long as the discharge hole 4 communicating with the interior of the nozzle portion 3 can be selected through the through hole 8, and the discharge direction, position, etc. of the powder coating can be changed by changing the selected discharge hole 4. In addition, the discharge hole 4 communicated through the through hole 8 is not limited to one discharge hole 4 arranged in the axial direction, and may also be configured such that two or more discharge holes 4 are communicated through the through hole 8. For example, it may also be configured such that the first discharge hole 4a and the second discharge hole 4b open simultaneously through the through hole 8. Explanation of reference numerals in the attached figures

[0053] 1. Powder coating nozzle 2 Main body 3 Nozzle section 4 discharge holes 4a First discharge port 4b Second discharge port 4c third discharge port 4d fourth discharge hole 5 sleeves 6-bar section 6 7 Switching Unit 7a First Card Slot 7b Second Card Slot 7c third card slot 7d fourth card slot 8 through holes 9 First object component 10 through holes 11 Second object component 12 Third object component

Claims

1. A powder coating nozzle, capable of coating a workpiece by discharging supplied powder coating material, characterized in that, have: The elongated nozzle section supplies the powder coating from one end to the other. Multiple discharge holes, which are formed on the other end side of the nozzle portion in a manner that is different from each other, discharge the powder coating supplied to the nozzle portion; as well as A sleeve, disposed inside the nozzle portion, is configured to move within the nozzle portion. A through hole is formed in the sleeve, and by moving the sleeve, the through hole can selectively connect one of the plurality of discharge holes to the interior of the nozzle portion.

2. The nozzle for powder coating according to claim 1, characterized in that, It also includes an operating unit that is connected to the sleeve in a manner that allows the sleeve to move, and that allows the discharge port connected to the interior of the nozzle portion to be selected through the through hole.

3. The nozzle for powder coating according to claim 1 or 2, characterized in that, The plurality of discharge holes have at least a plurality of predetermined discharge holes arranged along the length direction of the nozzle portion. The specified discharge holes are formed by passing through the nozzle portion at angles that are different from each other relative to the length direction. The sleeve is configured to move along the length direction inside the nozzle portion. The through hole is formed such that the sleeve moves along the length direction inside the nozzle portion, so that the position of the through hole coincides with the position of one of the predetermined discharge holes among the plurality of predetermined discharge holes. The nozzle portion is configured such that the position of the through hole coincides with the position of a certain discharge hole, thereby connecting the interior of the nozzle portion with a certain designated discharge hole.

4. The nozzle for powder coating according to claim 3, characterized in that, The specified discharge holes are arranged in multiple ways along the short side of the nozzle portion. The specified discharge holes adjacent to each other in the short-side direction are formed such that the angles relative to the length direction are the same for each other. The through hole is configured to allow multiple predetermined discharge holes arranged along the short side to simultaneously connect with the interior of the nozzle portion.

5. The nozzle for powder coating according to claim 4, characterized in that, The nozzle portion is formed in a cylindrical shape. The sleeve is formed in the shape of a cylinder that extends through the inner surface of the nozzle portion. The powder coating passes through the interior of the sleeve, through the through hole, and is discharged from one of the discharge holes. The sleeve and the plurality of discharge holes are configured such that the sum of the cross-sectional areas of adjacent discharge holes in the short side direction is equal to the cross-sectional area of ​​the flow path through which the powder coating passes inside the sleeve.

Images