JP2019122936A - Painting nozzle - Google Patents

Abstract

To form a paint film in a desired site of an object to be painted uniformly and efficiently and can be reduced in manufacturing costs and shorten in manufacturing time.SOLUTION: In a painting device 10, supplied paint is allocated from a paint chamber 70 into a plurality of paint passages 82 and then distributed to separate from each other at equal spaces in a width direction toward a nozzle plate 46, and air from an air chamber 72 is allocated through air passages 84a and 84b divided into two to separate from each other at equal spaces similar to the paint. The paint, discharged uniformly by being discharged through a discharge port 116 to the outside after the paint supplied into the nozzle plate 46 converges with the air in a converging part 126, forms a paint film on a surface of an object W.SELECTED DRAWING: Figure 7

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a coating nozzle used in a coating apparatus for coating an object to be coated such as an automobile body.

  2. Description of the Related Art Conventionally, an air spray type coating apparatus has been known as a means for coating a body or the like of an automobile. For example, as disclosed in Patent Document 1, this coating apparatus has a spray nozzle and a coating nozzle for discharging a coating material, and a pump connected to the pipe from the coating material to the spray nozzle and the coating nozzle. It is supplied and discharged at a high pressure, and the spray nozzle is moved by the robot arm to uniformly coat the surface of the object to be coated.

  In addition, the coating apparatus disclosed in Patent Document 2 includes a spray nozzle assembly including a nozzle body and an air cap, and atomizing air supplied from an actuator is mixed with a liquid such as a paint. The coating is performed by discharging the liquid in the form of a mist by fan air supplied through an air cap.

Japanese Patent Publication No. 2003-506210 Japanese Patent Application Publication No. 2006-521206

  In the coating apparatus of Patent Documents 1 and 2 described above, the coating material (liquid) discharged from the tip of the spray nozzle collides with air for atomization, so the air pressure of the air and the discharge pressure of the coating material High precision control is required.

  However, in the process of mixing and atomizing both by controlling the paint such as the air and the coating material described above, since the paint particles fly outward in the discharge direction, the paint is applied to the object to be coated. As the efficiency decreases, it is necessary to take time to overspray in order to obtain the coating film in the required range on the article to be coated.

  As a result, a coating material such as a coating material is wasted more than necessary, which causes an increase in manufacturing cost, and also increases the operation rate of the recovery facility to recover the surplus coating material. Power consumption will increase. In addition, it takes time to clean and maintain the paint adhering to the equipment such as a coating robot, which further increases the manufacturing cost.

  The present invention has been made in consideration of the above-mentioned problems, and a coating film can be formed uniformly and efficiently on a desired portion of an object to be coated, and the manufacturing cost can be reduced and the manufacturing time can be shortened. To provide a coating nozzle.

In order to achieve the above object, the present invention has a paint supply path for supplying paint, a fluid supply path for supplying fluid, and a body to which the paint supply path and the fluid supply path are connected. A coating nozzle is provided with a merging portion for combining and mixing paint and fluid, and a discharge hole for discharging from the merging portion in a state where the paint and fluid are mixed,
A merging portion and at least one or more discharge holes are provided inside the body, and a flat portion is provided on the tip end side of the discharge holes.

  According to the present invention, in a coating apparatus having a body to which a paint supply passage for supplying paint and a fluid supply passage for supplying fluid are connected, a joining unit for joining the supplied paint and the fluid is provided. A portion is formed inside the body, and includes at least one or more discharge holes for discharging paint particles in which the paint and the fluid are mixed, and a flat portion on the tip end side of the discharge hole.

  Therefore, the paint supplied from the paint supply and the fluid supplied from the fluid supply path respectively flow to the front end side of the body, and are discharged from the discharge hole to the outside in a mixed state at the merging portion in the body. At this time, the mixed paint (paint particles) can be suitably led to the outside by passing through the flat part provided on the tip side from the discharge hole, and its straightness and uniformity can be enhanced. In addition, by combining the paint and the fluid in advance at the merging portion in the body, stable paint particles can be generated as compared with the conventional coating apparatus in which both are mixed on the outside of the body, Thus, the paint discharged to the outside can be made uniform.

  As a result, a desired part of the object to be coated can be uniformly and efficiently coated by the coating apparatus, and since the amount of paint used can be reduced, the manufacturing time can be shortened while the manufacturing cost is reduced. it can.

  In addition, when the flat portion is formed into a flat shape along the direction substantially orthogonal to the axis of the body and is extended in a fan shape, the paint mixed with the fluid is discharged from the discharge hole to the outside Since the distance for guiding the paint from the discharge hole to the outside can be made uniform, the straightness of the discharged paint can be improved. As a result, it becomes possible to coat only the desired part vicinity in a thing to be coated efficiently, and while being able to reduce the amount of paints used compared with the conventional coating device, shortening of a painting process (manufacturing time) Can be Furthermore, by reducing the amount of consumption of paint, it is possible to reduce the operation rate of the recovery facility for recovering the paint used in the coating process, and to reduce the manufacturing cost by reducing the power consumption and the like.

  Further, the merging portion is configured such that one flow passage in communication with the paint supply passage and two flow passages in communication with the fluid supply passage sandwich the paint passage from two sides and join together in the body. By mixing paint and fluid more effectively, stable paint particles can be generated and discharged from the discharge hole, and it is possible to obtain a stable coating film by the paint uniformly discharged accordingly. Become.

  Furthermore, by providing the junctions in the same number corresponding to the respective discharge holes, control of the flow rate of the discharged paint and the pressure of the fluid can be easily performed, whereby stable paint application is possible. It becomes.

  Furthermore, at least one or more paint supply passages are communicated with the paint passage disposed substantially circumferentially in the body, and the paint passages are arranged in a straight line along the direction orthogonal to the axis at the junction. And may be formed to have substantially the same length. As a result, the paint can be supplied from the paint passage arranged substantially circumferentially to the merging portion at substantially the same flow rate, and the paint can be supplied from the merging portion through the plurality of discharge holes arranged linearly. Since uniform discharge can be performed, the uniformity and stability of the coating film on the object to be coated can be enhanced.

  According to the present invention, the following effects can be obtained.

  That is, the body constituting the coating apparatus is provided with a joining portion for joining the supplied paint and fluid, and at least one or more ejection holes for ejecting the paint particles mixed in the joining portion, and the ejection holes By providing a flat portion on the tip side from the side, by combining and mixing paint and fluid in advance at a merging portion in the body, a stable paint is obtained as compared with a conventional coating device mixed at the outside of the body. Particles can be generated, and accordingly, the paint discharged to the outside can be made uniform. Further, it is preferably formed into a flat shape along a direction substantially orthogonal to the axis of the body, and is suitably led to the outside by passing through the fan-shaped extended flat portion, and its straightness and uniformity are enhanced. Can. As a result, a desired part of the object to be coated can be uniformly and efficiently coated by the coating apparatus, and since the amount of paint used can be reduced, the manufacturing time can be shortened while the manufacturing cost is reduced. it can.

It is a schematic perspective view which shows the coating robot with which the coating apparatus which concerns on embodiment of this invention was attached. It is an external appearance perspective view of the coating apparatus shown in FIG. It is a whole side view of the coating apparatus shown in FIG. It is sectional drawing along the IV-IV line of FIG. It is an external appearance perspective view of the nozzle for coating which comprises the coating apparatus of FIG. It is a disassembled perspective view of the nozzle for coating shown in FIG. It is whole sectional drawing of the nozzle for coating along the VII-VII line of FIG. It is the flow-path perspective view which represented the flow path for paints and the flow path for air in the nozzle for coating shown in FIG. 7 typically. FIG. 6 is a partially omitted cross-sectional view along the line IX-IX in FIG. 5; It is an expanded sectional view of the discharge port vicinity in FIG. It is an expanded sectional view which shows the nozzle plate and cover plate vicinity in FIG. FIG. 12A is a schematic perspective view in which a plurality of coating nozzles are alternately arranged with respect to the frame, and FIG. 12B is a schematic diagram in which the plurality of coating nozzles are offset in the longitudinal direction of the frame. It is a perspective view.

  Preferred embodiments of the coating nozzle according to the present invention will be described in detail below with reference to the attached drawings. In FIG. 1, reference numeral 10 denotes a coating apparatus on which the coating nozzle 24 according to the embodiment of the present invention is mounted.

  As shown in FIG. 1, this coating apparatus 10 is provided on a painting robot 12 installed in a painting line such as a factory, and for example, discharges paint to an object (object to be coated) W such as a body of a vehicle. Thus, a coating film is formed on the surface of the object W.

  First, the coating robot 12 described above will be described with reference to FIG. The painting robot 12 is configured as, for example, an articulated robot, and a base 14 fixed to a painting line (not shown), a first arm 16 extending from the base 14, and a tip of the first arm 16 The base 14 and the first arm 16, and the first arm 16 and the second arm 18 are mutually connected via the joints 20a and 20b, respectively. It is movably connected. The joint portions 20a and 20b relatively rotatably connect the respective portions (for example, the base 14 and the first arm portion 16). Further, the coating device 10 is detachably provided at the tip of the second arm portion 18.

  Next, the coating apparatus 10 mounted on the above-described coating robot 12 will be described.

  As shown in FIGS. 1 to 4, the coating device 10 has, for example, a frame 22 mounted on the second arm 18 of the coating robot 12 and a plurality of coating nozzles installed on the frame 22. 24 and a mixer 26 (see FIGS. 2 and 3) provided on the frame 22 for distributing paint to a plurality of coating nozzles 24 respectively. The mixer 26 is connected to a paint supply device (not shown) via piping, and the paint is supplied from the paint supply device. In addition, the coating apparatus 10 provided with the nozzle 24 for 12 coating is demonstrated here.

  The frame 22 is formed of, for example, a metal material in a U-shaped cross section, and has an annular base portion 28 connected to the painting robot 12, and a pair of support portions 30a and 30b erected from the base portion 28; The base portion 28 is connected to the tip of the second arm portion 18 of the painting robot 12, and the plate portion 32 is provided between the support portions 30 a and 30 b.

  The support portions 30a, 30b extend substantially orthogonal to the base portion 28 and are formed to extend diagonally upward by a predetermined length, and one support portion 30a and the other support portion A plate portion 32 is provided to connect with 30b (see FIG. 4). That is, the plate portion 32 is provided to extend in the width direction (arrow A direction) orthogonal to the extending direction of the support portions 30a and 30b.

  The plate portion 32 is provided with a plurality of first pin holes 34 into which first positioning pins 60 of the coating nozzle 24 described later are fitted. The first pin holes 34 extend in the longitudinal direction of the plate portion 32. They are formed so as to be equidistantly spaced from each other along (the direction of arrow B in FIG. 3), and are formed in pairs along the width direction (the direction of arrow A). The first pin holes 34 are formed to have the same number or more as at least the number of the coating nozzles 24 to be mounted.

  Further, in the support portions 30a and 30b, side plates 36a and 36b are provided on the side portions which are the outer side in the width direction, and the side plates 36a and 36b A plurality of second pin holes 38 are provided along which the second positioning pins 62 of the coating nozzle 24 described later are fitted. The second pin holes 38 are formed to be equally spaced from each other along the longitudinal direction (the direction of the arrow B) of the side plates 36a and 36b, and are provided to be paired with the first pin holes 34. That is, the second pin holes 38 are provided in the same number as the first pin holes 34.

  Then, as shown in FIG. 4, the frame 22 is U-shaped in cross section from the support portions 30a and 30b including the side plates 36a and 36b and the plate portion 32, and the plurality of coating nozzles 24 are in the width direction inside Arranged and fixed in parallel to Specifically, as shown in FIG. 2, two paint nozzles 24 are arranged in parallel in the width direction (direction of arrow A) of the frame 22, and in the longitudinal direction (direction of arrow B) of the support portions 30a and 30b. Six are provided along the line.

  In addition, arrangement | positioning and quantity of the nozzle 24 for coating with respect to the flame | frame 22 are not limited to the structure mentioned above, What is necessary is just to set suitably to arrangement | positioning and quantity according to need.

  The coating nozzle 24 is provided detachably with respect to the frame 22, and as shown in FIGS. 5 to 7, for example, the body main body 40, the intermediate body 42 covering the end face of the body main body 40, and the cover plate And 44 a nozzle plate 46 provided at the tip end. The body main body 40 side of the coating nozzle 24 will be described as the base end side (arrow C1 direction) and the nozzle plate 46 side as the tip end side (arrow C2 direction). In addition, the body main body 40, the intermediate body 42, the cover plate 44, and the nozzle plate 46 described above function as a body constituting the coating nozzle 24.

  The body body 40 is a block body having a rectangular cross section, and on the side surface thereof, a pilot port 48 to which pilot air is supplied from a pressure fluid source (not shown) and a paint supply port (paint supply passage) 50 to which paint is supplied. And the pilot port 48 is formed on the proximal side (in the direction of the arrow C1), and the paint supply port 50 is formed on the distal side (in the direction of the arrow C2).

  A tube (paint supply path) 54 is connected to the pilot port 48 and the paint supply port 50 through a joint 52, respectively. The pilot port 48 and the paint supply port 50 are in communication with the first and second communication passages 56 and 58 (see FIG. 7) extending toward the inside of the body 40, respectively.

  Further, the first positioning pin 60 is provided on the base end surface of the body main body 40 at a position on the outer peripheral side of the storage hole 66 described later, and on the side surface, the base end side (arrow C1 direction) than the pilot port 48 The second positioning pin 62 is provided at the position.

  The first and second positioning pins 60 and 62 protrude by a predetermined height by being fitted into holes (not shown) on the base end surface and the side surface of the body main body 40, and the first and second in the frame 22 The pin holes 34 and 38 are respectively inserted and fitted. Thus, each of the coating nozzles 24 is positioned at a predetermined position of the frame 22 and fixed by a fixing bolt (not shown).

  On the other hand, as shown in FIG. 7, an accommodation hole 66 for accommodating the switching valve 64 is formed inside the body main body 40, and the accommodation hole 66 is opened at the center of the base end surface of the body main body 40. It is formed to extend along the axial direction (directions of arrows C1 and C2) and is in communication with the communication hole 68 opened at the center on the tip end side (direction of arrow C2). Further, the housing hole 66 is connected to and in communication with the pilot port 48 and the paint supply port 50 through the first and second communication passages 56 and 58, respectively.

  Then, as shown in FIG. 6 and FIG. 7, the switching valve 64 is inserted and stored in the housing hole 66 from the base end side (direction of arrow C1) of the body 40, and this switching valve 64 supplies pilot air. It has a valve body (not shown) which advances and retracts in the axial direction (arrows C1 and C2 directions) under action. The movement of the valve body switches the communication state between the paint supply port 50 and the communication hole 68 through the second communication passage 58.

  Further, a paint chamber 70 communicated with the communication hole 68 and expanded radially outward at the tip of the body main body 40 is formed, and an outer peripheral side of the paint chamber 70 from the air supply port 80 described later. An air chamber 72 to which air is supplied is formed.

  The paint chamber 70 is formed in the center of the body main body 40 in a circular shape in cross section, and is opened so as to face the intermediate body 42. When the paint supply port 50 and the communication hole 68 communicate with each other under the switching action of the switching valve 64, the paint is supplied to the paint chamber 70 through the second communication passage 58 and the communication hole 68. On the other hand, the air chamber 72 is annularly formed so as to surround the paint chamber 70 without communicating with the paint chamber 70.

  Furthermore, a first connection pin 74 is provided at a position on the outer peripheral side of the air chamber 72 at the tip of the body main body 40, and the intermediate body adjacent to the first connection pin 74 protrudes in the axial direction (arrow C2 direction) By being respectively fitted into the 42 pin holes 76 (see FIG. 7), the body main body 40 and the intermediate body 42 are positioned coaxially, and integrally integrated by four fastening bolts 78. It is connected.

  The intermediate body 42 is formed in a rectangular shape in cross section having substantially the same cross section as the body main body 40 and is connected to contact with the tip end side (direction of the arrow C2) of the body main body 40 and discharges paint on its side surface. The air supply port (fluid supply path) 80 to which the air (fluid) of the above is supplied is opened. A tube (fluid supply path) 54 is connected to the air supply port 80 via a joint 52. The air supply port 80 is formed on the side surface of the intermediate body 42 which is flush with the open side surface of the paint supply port 50 in the main body 40.

  On the other hand, inside the intermediate body 42, a plurality of paint passages 82 open at the center of the base end and extending to the tip end side (arrow C2 direction), and in the vertical direction (arrow D direction) A pair of provided air passages 84a and 84b are formed.

  For example, ten paint passages 82 are provided, and the base end of the paint passage 82 opens at the proximal end surface of the intermediate body 42 and communicates with the paint chamber 70 of the body main body 40, as shown in FIG. In order to correspond to the shape of the paint chamber 70, the paint chambers 70 are arranged at equal intervals along the circumferential direction.

  Further, the plurality of paint passages 82 are formed with the same passage diameter, and in the height direction (direction of arrow D) of the intermediate body 42 from the proximal end arranged on the circumference toward the distal end side (direction of arrow C2). As shown in FIGS. 8 and 9, in the width direction (arrow E direction) orthogonal to the height direction while being inclined so as to approach each other toward the center, they move toward the tip side (arrow C2 direction). It extends in equal intervals.

  The plurality of paint passages 82 open at the center in the height direction at the tip of the intermediate body 42, and as shown in FIG. 6, they are equally spaced apart from each other and are straight along the width direction (arrow E direction). Arranged in a shape.

  That is, the paint passages 82 extend in a three-dimensional manner from the base end of the intermediate body 42 toward the tip end (in the direction of the arrow C2) so that the respective passage lengths are substantially the same.

  The air passages 84a and 84b have a predetermined width in the width direction (direction of arrow E) of the intermediate body 42, and are formed on the proximal end side (direction of arrow C1) of the intermediate body 42, as shown in FIGS. And a second air passage 88 extending from the end of the first air passage 86 to the end of the intermediate body 42. The first air passage 86 extends along the axial direction of the intermediate body 42 by a predetermined length, opens at the proximal end of the intermediate body 42 and communicates with the air chamber 72 of the body 40.

  The seal ring 90 is held between the body portion 40 and the inner and outer circumferential sides of the first air passage portion 86 so that air leaks between the body body 40 and the intermediate body 42. Is prevented.

  The second air passage 88 extends from the end of the first air passage 86 toward the center in the height direction (the direction of arrow D), and inclines at the end of the intermediate body 42 from the center in the height direction. They are opened at positions equally spaced from each other in the vertical direction (direction of arrow D).

  That is, at the tip of the intermediate body 42, a plurality of paint passages 82 are opened at the center in the height direction, and the tips of the air passages 84a and 84b vertically extend across the paint passage 82 along the width direction (arrow E direction). It has an elongated opening (see FIGS. 6 and 7). Specifically, one air passage 84a formed at the upper side and the other air passage 84b provided at the lower side are formed in a bifurcated shape symmetrical in the height direction (the arrow D direction) of the intermediate body 42. ing.

  Further, at the tip of the intermediate body 42, second connection pins 92 (see FIG. 6) are provided at positions further below the air passage 84b opened upward and downward from the air passage 84a opened upward. The intermediate body 42 and the cover plate 44 are at predetermined positions by fitting the second connection pins 92 in the axial direction (the direction of the arrow C2) from the tip to the pin holes of the adjacent cover plate 44 respectively. And integrally connected by six fastening bolts 96 described later.

  For example, as shown in FIGS. 6 to 10, the cover plate 44 is formed in a plate shape having a constant thickness, is formed in a substantially rectangular shape covering the tip of the intermediate body 42, and protrudes from the tip A plurality of inner nozzle portions 98 are provided. The inner nozzle portion 98 is formed at the center of the cover plate 44 in the height direction (arrow D direction), provided at equal intervals along the width direction (arrow E direction), and axially (arrow C2 direction). ) Protrudes by a predetermined height.

  Further, the cover plate 44 is formed with a plurality of intermediate paint passage portions 100 penetrating in the axial direction at the center in the height direction, and the intermediate paint passage portions 100 are equally spaced from each other along the width direction (arrow E direction). Separated, the base end communicates with the paint passage 82 of the intermediate body 42, and the tip end penetrates the inside of the inner nozzle portion 98 and opens at the tip. The number of the intermediate paint passage portions 100 is set to ten so as to be equal to the number of the paint passages 82 and the inner nozzle portions 98 of the intermediate body 42.

  Furthermore, in the cover plate 44, a plurality of intermediate air passage portions 102 are formed at positions facing the tips of the air passages 84a and 84b of the intermediate body 42, respectively. The intermediate air passage portion 102 penetrates along the axial direction (directions of arrows C1 and C2) and opens at the tip, and is formed apart from each other in the vertical direction (direction of arrow D) with the intermediate paint passage portion 100 interposed therebetween. In addition, they are formed at equal intervals from each other so as to have the same spacing as the intermediate paint passage portion 100 in the width direction (the direction of the arrow E). That is, for each of the ten inner nozzle portions 98 (intermediate paint passage portion 100), ten intermediate air passage portions 102 are formed at the top and the bottom, respectively.

  Then, as shown in FIGS. 6 and 7, six fastening bolts 110 are respectively inserted into a plurality of bolt holes 104 provided on the upper and lower sides of the intermediate air passage 102 in the cover plate 44, and the intermediate body 42 is The cover plate 44 is connected to the front end of the intermediate body 42 by being screwed into the screw hole 106 of the second embodiment.

  Further, a gasket 108 is provided between the cover plate 44 and the intermediate body 42 so as to surround the air passages 84a and 84b (intermediate air passage portion 102) and the paint passage 82 (intermediate paint passage portion 100). , 84b, and also prevent the leakage of paint from the paint passage 82.

  Thus, in the cover plate 44, the intermediate air passage portion 102 communicates with the air passages 84a and 84b of the intermediate body 42, and the intermediate paint passage portion 100 communicates with the paint passage 82.

  The nozzle plate 46 is formed in a plate shape having a rectangular cross section and a predetermined thickness, and the flat end formed in contact with the front end of the cover plate 44 causes the base end side of the cover plate 44 (arrow C1 direction). ) Are connected by a fastening bolt 110 inserted from the

  On the other hand, at the center of the tip of the nozzle plate 46, as shown in FIG. 6, FIG. 7 and FIG. 11, there is formed a tip recess 112 which is recessed toward the base end side (arrow C1 direction). The paint discharge portion 114 extends in the same cross sectional shape along the width direction (arrow E direction), and protrudes in the axial direction (arrows C1 and C2 directions) from the tip at the center in the height direction (arrow D direction). It is formed.

  As shown in FIG. 5 to FIG. 9, the paint discharge section 114 is provided with a plurality of discharge ports 116 for discharging the paint mixed with air in a straight line along the width direction (the direction of the arrow E). The discharge ports 116 are provided at equal intervals from each other along the width direction of the paint discharge portion 114, and have discharge holes 118 opened in a circular shape in cross section, and a flat for guiding the paint from the discharge holes 118 to the outside. And a part 120. The discharge ports 116 are provided in the same number as the paint passage 82 and the middle paint passage portion 100, that is, ten.

  The discharge holes 118 communicate with the tip of the discharge passage 122 described later, and as shown in FIG. 9, the discharge holes 118 of the adjacent discharge ports 116 are in a straight line along the width direction (arrow E direction). It is formed.

  The flat portion 120 opens in, for example, a rectangular cross-section having a large width dimension with respect to the height dimension, and bulges in a cross-sectional fan shape in a direction (arrow C2 direction) separated from the discharge hole 118 in the width direction It forms so that the edge parts of the flat part 120 which adjoins and adjoins may be connected. That is, as viewed in the direction orthogonal to the width direction of the nozzle plate 46, the tips of the discharge ports 116 are formed in a concavo-convex shape by a plurality of adjacent flat portions 120.

  On the other hand, a plurality of discharge passages 122 penetrating in the axial direction are formed in the inside of the nozzle plate 46, and the discharge passages 122 are formed at the center in the height direction, and the tips thereof communicate with the discharge holes 118 respectively and The side (in the direction of arrow C1) opens at the proximal end of the nozzle plate 46, and the inner nozzle portion 98 of the cover plate 44 is inserted. Similar to the discharge port 116 and the inner nozzle portion 98 of the cover plate 44, the discharge passages 122 are formed at equal intervals from each other along the width direction (the direction of the arrow E) of the nozzle plate 46.

  Further, the inner nozzle portion 98 is inserted from the proximal end to the tip end side in the discharge passage 122 to the vicinity of the center in the longitudinal direction, and between the outer peripheral surface of the inner nozzle portion 98 and the inner peripheral surface of the discharge passage 122. As shown in FIGS. 9-11, an annular passage 124 is formed which is annular in the radial direction. That is, the discharge passage 122 is formed with a passage diameter larger than the diameter of the inner nozzle portion 98.

  Further, a merging portion 126 is formed in the discharge passage 122 at a position between the annular passage 124 and the discharge hole 118, and in the merging portion 126, the paint supplied from the inner nozzle portion 98 and the annular passage 124 The supplied air is mixed at a predetermined mixing ratio.

  Furthermore, in the nozzle plate 46, an air collecting chamber 128 opened on the base end side (the direction of the arrow C1) is formed in a substantially rectangular shape in cross section. This air collecting chamber 128 is all (20) in the cover plate 44 The intermediate air passage portion 102 is formed to communicate with the intermediate air passage portion 102.

  Further, the air collecting chamber 128 is in communication with the annular passage 124 of each discharge passage 122 at its tip end side. Then, the air supplied from the intermediate air passage portion 102 of the cover plate 44 is supplied to the annular passage 124 of each discharge passage 122 through the air collecting chamber 128. Then, the paint and air mixed in the merging portion 126 become paint particles and are sent out from the merging portion 126 to the discharge hole 118 and discharged from the discharge hole 118 to the outside.

  The coating apparatus 10 having the coating nozzle 24 according to the embodiment of the present invention is basically configured as described above, and next, a plurality of the coating nozzles 24 are attached to the frame 22 The case will be described.

  First, with respect to the frame 22 shown in FIGS. 2 to 4, the base end of the coating nozzle 24 is disposed on the plate portion 32 side, and the side surface is disposed on the side plates 36 a and 36 b.

  Then, the first positioning pin 60 provided on the coating nozzle 24 is fitted into the first pin hole 34 of the plate portion 32, and the second positioning pin 62 of the coating nozzle 24 disposed on one side in the width direction is By fitting into the second pin hole 38 of the side plate 36 a and fitting the second positioning pin 62 of the coating nozzle 24 disposed on the other side in the width direction into the second pin hole 38 of the side plate 36 b The position of each paint nozzle 24 with respect to the frame 22 is determined. Specifically, the plurality of coating nozzles 24 are positioned so as to be at predetermined positions along the longitudinal direction (arrow B direction) and the width direction (arrow A direction) of the frame 22.

  Then, the fixing nozzle (not shown) inserted through the plate portion 32 and the side plates 36a and 36b is screwed into the body main body 40 of the coating nozzle 24, so that the coating nozzle 24 is fixed to the frame 22. Each is fixed in the position of. Thus, the coating device 10 is configured in a state in which the plurality of coating nozzles 24 are continuously disposed and mounted along the longitudinal direction and the width direction of the frame 22.

  Finally, the fitting operation is completed by connecting the joints 52 and the tubes 54 to the pilot port 48, the paint supply port 50 and the air supply port 80 in each of the coating nozzles 24, respectively.

  Further, the coating device 10 is not limited to the case where the paint is simultaneously discharged from all the coating nozzles 24. For example, as shown in FIG. 12A, the frame 22 is switched by switching the switching valve 64 (see FIG. 7). Paint is discharged from the coating nozzle 24 every other piece in the longitudinal direction (arrow B direction), and one width direction on the side plate 36a side and the other width direction on the other side plate 36b side Alternatively, the paint may be applied in a staggered manner by alternately discharging the paint.

  Furthermore, the paint is discharged from the plurality of coating nozzles 24 disposed on the side plate 36a side in the direction of travel of the coating apparatus 10, and the plurality of coatings disposed on the side plate 36b side in the rearward direction of the travel direction. By discharging not the paint but the air from the nozzle 24, the paint discharged and applied on the front side in the traveling direction is suitably dried by the air discharged from the coating nozzle 24 on the rear side in the traveling direction. It becomes possible.

  Furthermore, the plurality of coating nozzles 24 are not limited to the case where they are continuously arranged to be adjacent along the longitudinal direction and the width direction of the frame 22 as described above, for example, as shown in FIG. As in the coating apparatus 160 shown, a plurality of coating nozzles 24 continuously provided in the width direction on one side of the side plate 36a and the other in the width direction on the other side of the side plate 36b are continuously provided. The plurality of coating nozzles 24 provided may be arranged to be offset in the longitudinal direction of the frame 22 (the direction of the arrow B).

  With such a configuration, when the paint is applied to the object W by the coating nozzle 24 disposed on one side in the width direction, the application to the portion 162 between the adjacent coating nozzles 24 is insufficient There is a concern that the coating nozzle 24 disposed longitudinally offset on the other side in the width direction reliably coats the portion 162 between the coating nozzles 24 on the one side in the width direction. Is possible.

  That is, the arrangement of the plurality of coating nozzles 24 with respect to the frame 22 is appropriately changed according to the size and shape of the object W to be coated by the coating apparatus 10 and 160 including the plurality of coating nozzles 24 and the coating pattern. It becomes possible to cope with the shape, the painting pattern, etc. easily and freely.

  Next, the operation and effects of the coating apparatus 10 in which the plurality of coating nozzles 24 are attached to the frame 22 as described above will be described.

  The coating robot 12 equipped with the coating apparatus 10 shown in FIG. 1 operates the first and second arm units 16 and 18 under the control of a controller (not shown) to apply the coating nozzle 24 of the coating apparatus 10. It arrange | positions in a predetermined | prescribed position (for example, the position facing the coating surface of the target object W).

  Thereafter, the paint is supplied from the paint supply device (not shown) to the mixer 26 through the piping, and distributed from the mixer 26 to the respective coating nozzles 24 through the plurality of tubes 54, and simultaneously from the air supply source not shown Air is supplied to the pilot port 48 and the air supply port 80 of the coating nozzle 24.

  In each of the coating nozzles 24, the pilot air supplied to the pilot port 48 is supplied to the switching valve 64 through the first communication passage 56, whereby the valve body is moved in the axial direction to be in the valve open state. The paint that has been supplied from the paint supply port 50 into the body 40 through the second communication passage 58 is supplied from the communication hole 68 to the paint chamber 70 as the valve body opens.

  The paint supplied to the paint chamber 70 is supplied to the tip side (in the direction of the arrow C2) through the ten paint passages 82, respectively. Under the present circumstances, since the passage diameter of paint passage 82 is formed the same, and the length is also formed substantially the same, the supply amount of the paint which flows to the tip side through each paint passage 82 becomes almost the same, and is supplied. The time for the paint to reach the tip end is also substantially the same.

  The paint flows along the paint passage 82 to the tip side (in the direction of the arrow C2) and gradually gathers at the height center of the intermediate body 42 and is led so as to be equally spaced apart in the width direction, After being positioned at the center of height at the tip of the intermediate body 42 and at positions spaced equally from each other in the width direction, the intermediate paint passage portions 100 of the cover plate 44 are supplied. Since ten intermediate paint passage portions 100 are provided in the same number as the paint passage 82, the supply amount of the paint from the paint passage 82 does not change, and the same supply amount is applied to the intermediate paint passage portion 100. Supplied.

  Then, the paint that has flowed to the tip of the inner nozzle portion 98 through the intermediate paint passage portion 100 is led out to the merging portion 126 of the discharge passage 122 in the nozzle plate 46.

  On the other hand, the air supplied to the air supply port 80 is supplied to the air passages 84a and 84b and the air chamber 72, and then the first and second air passage portions of the bifurcated air passages 84a and 84b. It is divided by flowing into 86 and 88 respectively, and flows from the top and bottom toward the tip side (direction of arrow C2). Further, as shown in FIG. 7, since the air passages 84a and 84b are formed to be symmetrical in the height direction (direction of arrow D) of the coating nozzle 24, the air supplied to the tip end side The amount of supplied air and the time to reach the tip become substantially the same, and the diverted air flows so as to gradually approach the height center toward the tip side (the direction of the arrow C2).

  Then, the air having flowed to the tip of the intermediate body 42 flows to the plurality of intermediate air passage portions 102 in the cover plate 44 and is further divided and then supplied to the air collecting chamber 128 of the nozzle plate 46. The air flows from the air collecting chamber 128 to the plurality of discharge passages 122, flows to the annular passage 124 which is the outside of the inner nozzle portion 98, and is then supplied to the merging portion 126. Accordingly, the paint discharged from the inner nozzle portion 98 and the air are mixed at a predetermined ratio in the merging portion 126.

  The paint particles in which the air and the paint are mixed in the merging portion 126 are delivered to the tip side along the discharge passage 122 and discharged from the discharge hole 118 to the outside through the flat portion 120. The coating device 10 described above discharges the supplied paint evenly from the plurality of coating nozzles 24 to the object W. Then, the coating robot 12 moves the coating device 10 while discharging the paint particles from the coating device 10 to form a coating film having a desired thickness on the object W.

  On the other hand, by stopping the supply of pilot air to the switching valve 64, the valve body of the switching valve 64 moves to the initial position and the valve is closed, thereby interrupting the communication between the paint supply port 50 and the paint passage 82. The discharge of the paint from the discharge port 116 is stopped. In this case, by continuing the supply of the air to the air supply port 80, only the air is discharged from the discharge port 116. Therefore, for example, the air may be applied to the coating applied to the surface of the object W It is also possible to accelerate the drying of the coating film by discharging the

  As described above, in the present embodiment, the paint is supplied to the paint supply port 50 of the main body 40 and the air is supplied to the air supply port 80 of the intermediate body 42 in the paint nozzle 24 of the coating apparatus 10. The nozzle plate 46 provided at the front end includes a merging portion 126 for merging the paint and the air, and a plurality of discharges from the merging portion 126 as paint particles in which the paint and the air are mixed. A discharge hole 118 is provided, and a flat portion 120 is provided on the tip end side (the direction of the arrow C2) of the discharge hole 118.

  As a result, the paint supplied from the paint supply port 50 and the air supplied from the air supply port 80 circulate to the nozzle plate 46 side which is the tip side, and the discharge holes 118 are mixed in the merging portion 126. When the paint is discharged to the outside, the paint is suitably led to the outside by passing the fan-shaped flat portion 120 from the discharge hole 118, so both the straightness and the uniformity of the discharged paint are improved. Can. Also, by combining paint and air in advance at the merging portion 126 in the nozzle plate 46, stable paint particles can be generated, so that the paint discharged to the outside can be further homogenized. .

  As a result, it is possible to uniformly and efficiently coat a desired portion of the object W by the coating apparatus 10, and it is possible to shorten the manufacturing time while reducing the amount of paint used.

  Further, the flat portion 120 of the discharge port 116 is formed in a flat shape elongated along the width direction (direction of arrow E) of the nozzle plate 46 and in the direction (direction of arrow C2) separating from the discharge hole 118 It extends like a fan in cross section. Therefore, when the paint is discharged from the discharge port 116 to the outside, as shown in FIG. 10, the paint can be discharged from the discharge hole 118 so as to fan out outward, and moreover, to the outside thereof. The distance of the flat portion 120 for guiding can be made uniform.

  As a result, the straightness of the paint discharged from the coating apparatus 10 can be improved, and only the vicinity of a desired portion of the object W can be efficiently coated, so it takes time to overspray. While it is not necessary to carry out, the amount of paint used can be reduced to reduce the manufacturing cost, and the painting process can be shortened.

  Furthermore, by reducing the amount of paint consumption as described above, it becomes possible to lower the operation rate of the recovery facility for recovering the paint used in the painting process as compared to the conventional painting apparatus, Accordingly, it is possible to reduce the manufacturing cost by reducing the power consumption and the like.

  Furthermore, the discharge passage 122 of the nozzle plate 46 includes an inner nozzle portion 98 provided at the center and supplied with the paint, and an annular passage 124 provided on the outer peripheral side of the inner nozzle portion 98 and supplied with air. A merging portion 126 where the paint and air merge at the tip end side of the inner nozzle portion 98 is provided.

  Therefore, the paint from the inner nozzle portion 98 and the air from the annular passage 124 are joined more effectively by joining them so as to be sandwiched from two sides by the joining portion 126, and the paint particles are generated more stably and discharge holes 118 are generated. Thus, the paint can be stably and uniformly discharged. Furthermore, a mixing effect can be obtained by providing an annular passage 124 which is an air flow passage so as to sandwich the central inner nozzle portion 98 from the outside in the discharge passage 122.

  Furthermore, by providing the merging portion 126 so as to have the same number as the discharge holes 118 of the plurality of discharge ports 116, it is possible to easily control the flow rate of the discharged paint and the pressure of the air. This enables stable coating (straightness, uniformity) of the paint.

  Further, a plurality of paint passages 82 are connected to the paint chamber 70 formed at the base end in a circular cross-sectional shape so as to be equally spaced apart along the circumferential direction, and the tip of the paint passage 82 has a width The paint passages 82 are arranged in a straight line along the direction, and the lengths of the paint passages 82 are formed to be substantially the same. Thus, the paint can be supplied from the paint chamber 70 to the tip side (in the direction of the arrow C2) at substantially the same flow rate through the paint passages 82, and the paint can be uniformly discharged from the discharge holes 118. Since it can do, the uniformity and stability of the coating film in subject W can be improved.

  The coating nozzle according to the present invention is not limited to the above-described embodiment, and it goes without saying that various configurations can be adopted without departing from the scope of the present invention.

10, 160 ... coating apparatus 12 ... coating robot 22 ... frame 24 ... nozzle for coating 40 ... body body 42 ... intermediate body 44 ... cover plate 46 ... nozzle plate 50 ... paint supply port 70 ... paint chamber 72 ... air chamber 80 ... air chamber 80 Supply port 82: Paint passage 84a, 84b: Air passage 98: Inner nozzle portion 100: Intermediate paint passage portion 102: Intermediate air passage portion 114: Paint discharge portion 116: Discharge port 118: Discharge hole 120: Flat portion 122: Discharge passage 124 ... annular passage 126 ... junction W ... object

Claims (5)

A paint supply path for supplying paint, a fluid supply path for supplying fluid, and a body to which the paint supply path and the fluid supply path are connected, the body is made to merge the paint and the fluid A coating nozzle comprising: a merging portion to be mixed; and a discharge hole to be discharged from the merging portion in a state in which the paint and the fluid are mixed,
The coating nozzle according to claim 1, wherein the confluent portion and at least one discharge hole are provided in the inside of the body, and a flat portion is provided on a tip end side of the discharge hole. In the nozzle for coating according to claim 1,
The said flat part is formed in flat shape along the direction substantially orthogonal to the axis line of the said body, and extends in a fan shape, The nozzle for coating characterized by the above-mentioned. In the nozzle for coating according to claim 1 or 2,
The coating nozzle is characterized in that the merging portion is formed by combining one flow passage communicating with the paint supply passage and two flow passages communicating with the fluid supply passage. In the nozzle for coating according to any one of claims 1 to 3,
The coating nozzles are characterized in that the merging portions are provided in the same number corresponding to the respective discharge holes. In the nozzle for coating according to any one of claims 1 to 4,
The paint supply passage is in communication with a paint passage provided at least one or more and disposed substantially circumferentially in the body, and the paint passage is disposed in a straight line along a direction perpendicular to the axis at the junction. And a coating nozzle having substantially the same length.

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