JP3922663B2 - Application nozzle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an application nozzle that attaches a liquid such as a paint to a liquid ejection tip of an application apparatus that applies a liquid to an object surface.
[0002]
[Prior art]
A nozzle is attached to the paint outlet of the coating apparatus that sprays the paint onto the object surface. The nozzle tip has an appropriate shape depending on the shape of the surface of the object to be coated, the type of paint used, the spraying shape of the paint, etc., so that the paint can be satisfactorily applied to the surface of the object to be painted. The
[0003]
Japanese Patent Application Laid-Open No. 8-224503 discloses a nozzle that can apply a peelable protective film without adhering paint splashes around. As shown in FIG. 5, this nozzle has a plurality of fine holes 101 arranged in a row facing the surface 103 to be coated and discharging paint. The paint discharged from the plurality of pores 101 arranged in a row is combined in the lateral direction to form a sheet having a certain coating width and applied to the surface to be coated.
[0004]
[Problems to be solved by the invention]
A conventional application nozzle in which a large number of fine holes for discharging paint are arranged in a row needs to have a large number of fine holes having the same width as the application width, and the application nozzle becomes larger than the application width. In addition, there are problems that clogging and the like are likely to occur due to a large number of pores, and management of the coating nozzle is difficult.
[0005]
Then, this invention makes it a subject to provide the simple coating nozzle which can apply | coat with a uniform coating film thickness and wide.
[0006]
[Means for Solving the Problems]
The coating nozzle of the present invention has a predetermined converging width in a predetermined depth in a direction converging from the outlet while maintaining the predetermined gap at one end with a outlet having a predetermined gap and extending in a predetermined arc shape. Chi to the other end of the inlet, the nozzle passage Ogidai shape paint is injected in a radial direction of the outlet, conductor inlet is defined by an inner wall surface of the arc extending along a conductor inlet opening An internal space and an introduction passage communicating with the internal space are provided. The fan-shaped shape means a trapezoidal shape in which a short upper side and a long lower side of a normal trapezoid are replaced with an arc-shaped arc having a small curvature radius and an arc having a large curvature radius.
[0007]
In the coating nozzle of the present invention, the paint accumulated in the internal space is discharged from a fan-shaped nozzle passage having a slit-shaped gap, and is discharged in a film shape while widening the width. As a result, a film-like coating film having a wide and constant thickness can be easily formed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The coating nozzle of the present invention has a nozzle passage, an internal space, and an introduction passage. The nozzle passage has a slit-like narrow predetermined gap, and has an outlet having a predetermined width extending in an arc shape at one end, and an inlet having an arc-shaped predetermined convergence width at a predetermined depth in the direction of convergence from the outlet. It has a fan shape at the other end. The paint is guided from the inlet to the outlet, and is pushed out of the nozzle passage while widening like a fan. The optimum one can be selected according to the properties of the paint, application conditions, etc., such as the size of the fan base, the opening angle, the distance from the inlet to the outlet, the size of the gap between the slits, and the like.
[0009]
The internal space is a space for storing paint and supplying the paint uniformly to the inlet of the nozzle passage. The inlet of the nozzle passage opens in this internal space. An internal space is defined by an arc-shaped inner wall surface extending along the introduction port. That is, the internal space has a very wide width compared to the gap of the nozzle passage. The shape of the internal space may be a fan shape, the introduction passage may be opened at a position of the fan, and the introduction port of the nozzle passage may be opened at the position of the arc of the fan.
[0010]
By making the internal space into a fan shape, the coating material sent from the introduction passage to the essential position in the internal space at a predetermined flow velocity spreads out from the essential position in a fan shape and drops the flow velocity. And every part is extruded by the same flow velocity to the outlet opening opened to the arc-shaped inner wall surface. This increases the uniformity of the applied paint.
The introduction passage is a passage for supplying paint to the internal space. A paint supply pipe or the like connected to the paint supply source is connected to the introduction passage.
[0011]
The coating nozzle of the present invention defines at least a part of an inner wall surface that partitions a nozzle passage and a part of an inner wall surface that partitions an inner space, and a remaining part of the inner wall surface that partitions a nozzle passage and an inner space. It can comprise from the cover part which has the remainder of an inner wall surface. You may make it have a nozzle channel | path in this main-body part.
Further, the coating nozzle of the present invention comprises a main body part having a part of an inner wall surface defining a nozzle passage, a part of an inner wall surface defining an internal space, and a part of an inner wall surface defining an introduction passage, and a nozzle passage. The remaining portion of the inner wall surface to be partitioned, the remaining portion of the inner wall surface that partitions the internal space, and the lid portion having the remaining portion of the inner wall surface that partitions the introduction passage can be configured.
[0012]
[Operation and effect of the invention]
In the coating nozzle having such a configuration, the liquid such as the paint fed from the introduction passage is once stored in the internal space. Then, paint or the like is pushed out into the inlet of the nozzle passage communicating with the internal space.
The paint sent through the introduction passage enters the internal space. At this time, the paint has a relatively large flow rate. However, by entering the expanded internal space, the flow rate of the paint is reduced, resulting in a slow flow. Thereby, the flow velocity change by the partial part in internal space becomes small. The paint is supplied at almost the same flow rate to any part of the inlet of the nozzle passage.
[0013]
The depth of the nozzle passage in the convergence direction is substantially equal throughout the passage. Further, the gap of the nozzle passage is extremely narrow compared to the size of the internal space. That is, the passage resistance in the nozzle passage is high. Thereby, the pressure of the paint pushed into the inlet of the nozzle passage from the internal space is further uniformed at any part of the inlet. Then, the paint sent into the inlet is ejected equally in the radial direction of the outlet through the nozzle passage having a predetermined depth. That is, an equal amount of paint is continuously ejected at an equal pressure in any part of the outlet.
[0014]
Further, since the nozzle passage is formed in a fan shape and the inlet and outlet are formed in an arc shape, the sprayed paint is ejected from the outlet while increasing the width. As a result, the coating applied on the object has a coating width wider than that of the outlet, and the thickness of the entire coating film is always uniform. That is, the paint can be applied with a uniform film thickness that is wider than the length of the nozzle passage in the arc direction.
[0015]
This application nozzle can be composed of a main body part that partitions a part of the nozzle passage and the internal space, and a lid part that partitions the remaining part of the nozzle passage and the internal space. By doing so, when the liquid is clogged in the nozzle passage, the clogging can be immediately removed and resolved by disassembling the lid portion and the main body portion.
Further, the nozzle passage, the internal space, and the introduction passage can be configured to be plane-symmetric with respect to the same plane. By doing so, it becomes easy to manufacture the application nozzle.
[0016]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. The top view of the coating nozzle 1 of the Example of this invention is shown in FIG. 1, and the top view is shown in FIG. FIG. 3 is a cross-sectional view taken along the line II ′ shown in FIG. 1, and FIG. 4 is an overall perspective view schematically showing the coating state fixed to the tip of the paint supply pipe 49. As shown in FIG.
[0017]
As is apparent from FIGS. 1 and 4, the coating nozzle 1 of the present embodiment has a substantially fan-shaped thick plate shape as a whole. The application nozzle 1 includes a main body 25 and a lid 23. The main body portion 25 has a substantially L-shape that is thicker at a main portion 3 that is substantially fan-shaped and has a thinner other tip portion. The lid portion 23 has a shape that compensates for the thin portion of the tip portion of the main body portion 25, and the main body portion 25 and the lid portion 23 are fixed by four embedded screws 27.
[0018]
The nozzle passage 37 and the internal space 15 are partitioned by the main body portion 25 and the lid portion 23. That is, the nozzle passage 37 is formed by forming a shallow groove-like recess having a fan-like shape on the mating surface side of the lid portion 23. The depth of this recess becomes the gap 35 of the nozzle passage 37. The internal space 15 is formed by forming relatively deep substantially fan-shaped recesses on both mating surfaces of the main body portion 25 and the lid portion 23. The nozzle passage 37 and the internal space 15 are connected by the respective recesses of the lid portion 23 communicating with each other, the introduction port 45 is opened on the inner wall surface of the internal space 15, and the outlet port 43 is opened on the opposite end surface.
[0019]
The introduction passage 5 is formed in the main part 3 of the main body 25 as a tapered through hole having a small diameter on the inner space 15 side, and a female screw 11 is screwed on the inner peripheral surface 9 thereof. The portion of the introduction passage 5 that communicates with the internal space 15 is formed by forming a recess on both mating surfaces of the main body portion 25 and the lid portion 23.
A paint supply pipe 49 of a fixed quantity supply device (not shown) is screwed into the introduction passage 5, and the paint supply pipe 49 is sandwiched by the tapered shape of the inner peripheral surface 9. As a result, the application nozzle 1 is fixed to the tip of the paint supply pipe 49. In this embodiment, the gap 35 is 0.6 mm, the opening length of the outlet 43 is 43 mm, the radius of curvature of the outlet 43 is 30 mm, the radius of curvature of the inlet 45 is 22 mm, the inner diameter of the conduit 13 is 12 mm, the nozzle passage The passage length of 37 was about 8 mm.
[0020]
Next, the function of the coating nozzle 1 of the present embodiment will be described. As shown in FIG. 4, the coating nozzle 1 is screwed to the tip of the paint supply pipe 49. Then, the paint is fed from the paint supply pipe 49 to the introduction passage 5 of the application nozzle 1 at a predetermined pressure. The coating material supplied into the coating nozzle 1 is fed into the internal space 15 through the introduction passage 5 and the conduit 13. The paint guided into the internal space 15 is temporarily stored in the internal space 15. By releasing the paint once into the internal space 15 which is a wide space, the internal pressure unevenness generated in the paint liquid is made uniform.
[0021]
Then, the paint is pushed out from the internal space 15 to the inlet 45 of the nozzle passage 37. The paint pushed into the inlet 45 is ejected radially from the outlet 43 through the nozzle passage 37. The sprayed paint becomes a film with a thickness corresponding to the gap 35 of the nozzle passage 37 and adheres to the surface 53 of the object to be coated while spreading in a skirt shape.
[0022]
In this way, the internal pressure of the paint supplied into the application nozzle 1 is averaged by the wide space of the internal space 15. In addition, since the inlet 45 of the nozzle passage 37 is open in the direction in which the fan radius of the internal space 15 extends, the moving speed of the paint passing through the nozzle passage 37 is made uniform.
Therefore, the paint is ejected at the same pressure in the entire outlet 43 of the nozzle passage 37. For example, low pressure (about 170 kg per square centimeter) and about 5 liters per second can be ejected. As shown in FIG. 4, the paint sprayed from the outlet 43 adheres onto the surface 53 of the object to be coated while gradually spreading the coating width.
[0023]
The coating nozzle 1 is slowly translated in the direction of an arrow 47 parallel to the surface 53 of the object to be coated, and the paint sprayed from the coating nozzle 1 is applied to the surface 53 of the object to be coated with a predetermined film. Can be applied in thickness. In this example, a uniform film-like coating film can be formed by setting the film thickness to 3 mm, the coating width to 100 mm, and the coating progressing speed to about 300 mm per second when the coating is undried. It was.
[0024]
The application nozzle of the present invention is not limited to water-based emulsion paints, but also epoxy paints, water-based paints, organic solvent-based paints, or adhesives such as Canadian balsam, trough balsam, peru balsam, water glass, or gluten. Ink or moisture-proofing agent such as adhesives, glycerin, nitroglycerin, gyptal resin, or insecticides such as chlordane, pyrethrin, protective film materials such as coal tar, hyaluric acid, viscose, or pine resin, sandalwood oil, latex, You may use for application of all viscous substances, such as protective agents, such as chlorobrene rubber and raw rubber, coating materials, such as collodion and nitrocellulose, photosensitive film materials, and dialysis film materials.
[0025]
As described above, the coating nozzle 1 according to the present embodiment has a flow velocity that is weakened in the internal space 15 even when a coating material with a biased flow velocity is fed into the hollow internal space 15. Is resolved. That is, non-uniformities such as the flow velocity of the injected paint can be suppressed by the expanded internal space 15.
Further, the passage length 57 of the nozzle passage 37 is formed so that the central portion thereof is slightly longer than the side end portion of the outlet port 43. Therefore, the spray pressure of the paint sprayed from the outlet port 43 through the nozzle passage 37 can be made substantially uniform throughout the outlet port 43. Moreover, since the nozzle passage 37 has a fan shape, the sprayed paint spreads radially from the outlet 43. The width of the outlet 43 of the coating nozzle 1 can be made shorter than the coating width of the coating material, and the thickness of the coating film can be made constant.
[0026]
Moreover, since it has the wide internal space 15 and the nozzle passage 37 extending in an arc shape, the discharge pressure of the paint ejected from the outlet port 43 of the nozzle passage 37 can be reduced, and the paint does not atomize. As a result, the occurrence of application defects such as “tail” or “mist” on the liquid application surface can be prevented.
[Brief description of the drawings]
FIG. 1 is a plan view of an application nozzle according to an embodiment.
FIG. 2 is a top view of an application nozzle according to an embodiment.
3 is a cross-sectional view taken along the line II ′ of FIG.
FIG. 4 is a perspective view showing a usage state of the application nozzle of the embodiment.
FIG. 5 is a cross-sectional view of a conventional coating nozzle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Coating nozzle, 3 ... Main part, 5 ... Introduction passage, 9 ... Inner peripheral surface, 13 ... Conduit, 15 ... Internal space, 23 ... Cover part, 25 ... Main-body part, 27 ... Screw, 29 ... Inner wall ceiling surface, 35 ... Gap, 37 ... Nozzle passage, 39, 43 ... Outlet port, 45 ... Inlet port, 49 ... Paint supply pipe, 101 ... Pore, 103 ... Coating surface.

Claims (6)

An outlet having a predetermined gap and having an arc-shaped predetermined convergence width at a predetermined depth in a direction converging from the outlet while maintaining the predetermined gap is provided at one end. A fan-shaped nozzle passage through which paint is sprayed in the radial direction of the outlet ,
An internal space defined by an arcuate inner wall surface extending along the introduction port where the introduction port opens;
An introduction passage communicating with the internal space;
An application nozzle characterized by having.   The coating nozzle according to claim 1, wherein the nozzle passage, the internal space, and the introduction passage have a plane-symmetric shape with respect to the same plane.   The coating nozzle according to claim 1, wherein the internal space has a fan shape that converges from an inner wall surface including the introduction port to a discharge port of the introduction passage. A body portion having at least a part of an inner wall surface defining the nozzle passage and a part of an inner wall surface defining the inner space, a remaining portion of the inner wall surface defining the nozzle passage, and an inner wall surface defining the inner space. A lid with a remainder,
The coating nozzle according to claim 1, comprising:   The coating nozzle according to claim 4, wherein the main body has the nozzle passage. A main body having a part of an inner wall surface defining the nozzle passage, a part of an inner wall surface defining the internal space, and a part of an inner wall surface defining the introduction passage; and an inner wall surface defining the nozzle passage A lid portion having a remaining portion, a remaining portion of the inner wall surface that defines the internal space, and a remaining portion of the inner wall surface that defines the introduction passage;
The coating nozzle according to claim 1, comprising:

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