WO2015125619A1

WO2015125619A1 - Spray gun

Info

Publication number: WO2015125619A1
Application number: PCT/JP2015/053213
Authority: WO
Inventors: 芳裕藤原; 朋哉小林
Original assignee: アネスト岩田株式会社
Priority date: 2014-02-21
Filing date: 2015-02-05
Publication date: 2015-08-27
Also published as: JP2015157244A; JP6267538B2; CN106029238A

Abstract

Provided is a spray gun (1) which can achieve pattern uniformity of a coating material. The spray gun (1) is provided with: a gun main body (10) which has a paint spray nozzle (20); multiple pattern spray nozzles (50) which spray air approximately parallel with the paint spray direction; and a cap (52) which comprises a center opening end (52H) which has an opening greater than or equal to the outer diameter of the paint spray nozzle (20), and an inner wall surface (52W) which communicates with the center opening end (52H) and is inclined such that the inner diameter increases in the paint spray direction, and which has multiple granularity adjustment nozzles (55) which are formed in the inner wall surface (52W) and spray air to adjust the granularity of the paint. The granularity adjustment nozzles (55) are formed such that the axis lines thereof are at a prescribed angle of inclination relative to the axis line of the paint spray direction of the paint spray nozzle (20), and in the cap (52), slits (60) are formed for supplying air towards the pattern spray nozzles (50).

Description

Spray gun

The present invention relates to a spray gun, and more particularly to an external mixing type spray gun for pattern blowing.

The spray for spraying the coating material for building finishing is, for example, spraying (ball blowing) such as uneven patterns on a tile material or the like that has been subjected to base blowing (base blowing) (see Patent Document 1 below).

As a spray gun having such a function, for example, as disclosed in Patent Document 2, a pattern in which compressed air is jetted around a nozzle (paint jet nozzle) from which paint is jetted is substantially parallel to the paint jet direction. One having a blow nozzle is known. The compressed air from the pattern blowing nozzle is formed into a pattern (for example, a ball pattern) by tearing off the paint from the paint ejection nozzle to form relatively large particles.

However, the spray gun shown in Patent Document 2 has the disadvantage that the paint discharge direction becomes irregular and the pattern of the coating material cannot be made uniform. In addition, the spray guns shown in Patent Document 1 and Patent Document 2 have different troubles in that the types of nozzles and caps are different in the base blowing process and the pattern blowing process, and that different nozzles and caps are exchanged for each process.

Japanese Patent Laid-Open No. 01-127079 JP-A-63-224756

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a spray gun capable of achieving the uniformity of the pattern of the coating material. Another object of the present invention is to provide a spray gun that uses the same nozzle and cap in the base blowing process and the pattern blowing process.

The present invention can be configured as follows.
(1) The spray gun of the present invention
An external mixing spray gun for pattern blowing,
A gun body having a paint jet nozzle for jetting paint;
A plurality of pattern blowing nozzles, which are provided on the gun body side from the paint jet nozzle part and jet air in substantially parallel to the paint jet direction, are substantially equally spaced in the circumferential direction in the front view of the paint jet nozzle part, and A pattern blowing nozzle portion disposed at a position that is substantially the same distance from the paint ejection nozzle portion;
A cap mounted so as to cover the outer periphery of the paint jet nozzle part,
The cap has a central opening end having an opening equal to or larger than the outer diameter of the paint ejection nozzle part, and an inner wall surface that is connected to the central opening end and is inclined so that an inner diameter is widened in the paint ejection direction.
The cap includes a plurality of particle size adjusting nozzles for ejecting paint particle size adjusting air in the front view, the position of the inner wall surface being substantially equal in the circumferential direction and substantially the same distance from the paint spray nozzle portion. Has a particle size adjustment nozzle part formed in
The particle size adjusting nozzle of the particle size adjusting nozzle with respect to an axis of the paint ejecting direction of the paint ejecting nozzle portion so that the particle size adjusting air is blown obliquely to the paint ejected from the paint ejecting nozzle portion. The particle size adjustment nozzle is formed such that the axis has a predetermined inclination angle,
The cap is attached to the gun body so that a slit portion formed by a gap is formed between the center opening end and the outer peripheral portion of the pattern blowing nozzle portion, and the slit portion is the pattern blowing nozzle. Air is supplied to the part side.
(2) In the configuration of (1), it is preferable that the spray gun has an angle at which the predetermined inclination angle converges on an axis of the paint jetting direction, preferably 110 degrees or more and 140 degrees or less.
(3) In the configuration of (1) or (2), the spray gun is configured such that the particle size adjusting nozzle is in contact with the outer periphery facing the pattern blowing nozzle from the center of the paint spray nozzle portion in the front view. It is preferably arranged outside the range described by the two drawn straight lines.
(4) The spray gun according to any one of (1) to (3), wherein the particle size adjusting nozzle portion has a total opening area A obtained by summing the opening areas of the particle size adjusting nozzles, and the slit portion. Has a total opening area B, the pattern blowing nozzle portion has a total opening area C obtained by summing up the opening areas of the respective pattern blowing nozzles, and the relationship between these total opening areas is the total opening area A <total opening area B <The total opening area C is preferred.
(5) In the spray gun according to any one of (1) to (4), the spray main body preferably includes a particle size adjusting unit that adjusts a supply amount of air supplied to the particle size adjusting nozzle unit.

The spray gun constructed in this way can achieve a uniform coating material pattern. In addition, both the base blowing process and the pattern blowing process can be performed consistently with the same nozzle and cap.

It is sectional drawing which shows the outline of Embodiment 1 of the spray gun of this invention. It is a front view which shows the front-end | tip part of the barrel part of the spray gun of this invention. It is sectional drawing to which the front-end | tip part of the barrel part of the spray gun of this invention was expanded. It is the perspective view which showed the front-end | tip part of the barrel part of the spray gun of this invention. It is the front view of the tip of the barrel part of the spray gun of the present invention, and is the figure showing the arrangement relation of a pattern spray nozzle and a particle size adjustment nozzle. (A), (b) is the front photograph of the tip of the barrel part of the spray gun of the present invention, (a) shows the case where the slit part is formed, (b) shows the slit part formed. It is a photograph showing the case of not.

DETAILED DESCRIPTION Hereinafter, embodiments for carrying out the present invention (hereinafter, embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view schematically showing Embodiment 1 of the spray gun of the present invention.

In FIG. 1, a spray gun 1 is shown. The gun body 10 includes a barrel portion 11, and a paint spray nozzle portion 20 through which paint is sprayed is attached to a tip portion T of the barrel portion 11. The paint jet nozzle unit 20 communicates with a paint supply port 12 formed in the barrel unit 11, and the paint is supplied to the paint jet nozzle unit 20 through the paint supply port 12. The paint jet nozzle portion 20 is provided with a needle 21 arranged coaxially therewith. By operating the trigger 30, the needle 21 is moved rearward in the axial direction, whereby the needle valve 21A provided on the needle 21 releases the seal with the paint ejection nozzle section 20, and the paint is applied to the paint ejection nozzle section. It can be ejected as a paint flow from 20 paint outlets 22. A paint spray amount adjustment knob 23 is provided at the rear end of the barrel portion 11 and on the extension of the needle 21. By the rotation of the paint jetting amount adjusting knob 23, the opening degree formed between the sheet portion of the paint jetting nozzle 22 of the paint jetting nozzle portion 20 and the needle valve 21A is adjusted so that the jetting amount of the paint can be adjusted. It has become.

On the other hand, the spray gun 1 includes a grip portion 14 provided on the rear side of the barrel portion 11. From the grip portion 14, compressed air (which may be referred to as air in this specification) is sent to the air valve portion 43 via the air nipple 41 and the air passage 42, and is further guided to the air passage 44. It has become. By moving the air valve rod 45 rearward in the axial direction by the above-described operation of the trigger 30, the air valve portion 43 is opened.

The compressed air guided from the air valve portion 43 to the air passage 44 is supplied to a plurality of (six in the figure, but not limited to six) pattern blowing nozzles 50 (see FIG. 2) formed around the paint jet nozzle portion 20. It has come to be guided. The pattern spray nozzle 50 is disposed so as to be substantially parallel to the paint spray nozzle portion 20, and thereby the compressed air from the pattern spray nozzle 50 is sprayed substantially parallel to the paint spray direction of the paint spray nozzle portion 20. Further, the pattern spray nozzle 50 is provided on the gun body 10 side from the paint spray nozzle portion 20, and thereby the tip of the paint spray nozzle portion 20 is arranged to protrude forward from the tip of the pattern spray nozzle 50. Yes. As shown in FIG. 2, when the front end portion T of the spray gun 1 is viewed from the front, the pattern blowing nozzles 50 are substantially evenly spaced in the circumferential direction around the paint ejection nozzle portion 20 and substantially from the paint ejection nozzle portion 20. They are placed at the same distance. The diameter of the pattern blowing nozzle 50 is preferably, for example, not less than φ2 mm and not more than φ2.5 mm. The compressed air from each of the pattern blowing nozzles 50 is supplied to the flow of paint ejected from the paint jet nozzle section 20, and the paint flow is torn off by the compressed air. As a result, relatively large particles are formed, so that the paint ejected from the paint ejection nozzle portion 20 has a pattern. In this specification, the plurality of pattern blowing nozzles 50 may be collectively referred to as a pattern blowing nozzle unit.

Further, as shown in FIG. 3 which is an enlarged cross-sectional view of the distal end portion T of the barrel portion 11, a cap 52 is disposed so as to cover the outer periphery of the paint ejection nozzle portion 20. The cap 52 is attached to the barrel portion 11 via a cap cover 53. As shown in FIG. 4 which is a perspective view of the cap 52, a central opening end 52H having an opening larger than the outer diameter of the paint jet nozzle portion 20 and an inner diameter extending in the paint jetting direction are connected to the central opening end 52H. The inner wall surface 52W is inclined as described above. On the inner wall surface 52W of the cap 52, a plurality of particle size adjusting nozzles 55 (six in the figure but not limited to six) are formed. These particle size adjustment nozzles 55 are arranged at substantially equal intervals in the circumferential direction centering on the paint ejection nozzle portion 20 and at positions where the distances from the paint ejection nozzle portion 20 are substantially equal. In this case, for example, as shown in FIG. 5, the particle size adjusting nozzle 55 has two straight lines (shown by dotted lines in the drawing) drawn from the center of the coating material spray nozzle portion 20 so as to contact the outer periphery facing the pattern blowing nozzle 50. It is arranged outside the range described in. Such an arrangement relationship between the particle size adjusting nozzle 55 and the pattern blowing nozzle 50 is designed so as not to cancel each other's effects. The compressed air (particle size adjusting air) from each particle size adjusting nozzle 55 functions so as to directly collide with the coating material from the coating material ejection nozzle portion 20 so that the coating material can be atomized with less air energy. ing. For this reason, the base spraying process can be performed with the paint whose atomization is promoted.

Further, as shown in FIG. 3, each particle size adjusting nozzle 55 communicates with an air passage 46 through which compressed air is guided from the air passage 44 via the particle size adjusting valve 57, and the compressed air is opened by opening the particle size adjusting valve 57. Will be ejected. As shown in FIG. 1, the particle size adjusting valve 57 is a particle size adjusting knob (in this specification, a particle size adjusting portion and a second end of the adjusting valve rod 59 provided at the rear end portion of the barrel portion 11). The degree of opening with the sheet portion is adjusted by adjusting the rotation of 58, and the flow rate of the compressed air sent to each particle size adjusting nozzle 55 is adjusted.

Further, as shown in FIG. 3, each particle size adjusting nozzle 55 has an axis O ′ having an inclination angle θ (for example, 110 degrees or more and 140 degrees or less) with respect to the axis O in the paint ejection direction of the paint ejection nozzle portion 20. It is formed as follows. Thereby, the particle size adjustment nozzle 55 blows compressed air (particle size adjustment air) so as to converge obliquely with respect to the paint from the paint jet nozzle portion 20 to be ejected. Here, when the inclination angle θ of each particle size adjusting nozzle 55 is increased, the atomization energy increases, but the forward paint conveying effect is braked. In order to avoid the inconvenience, when the inclination angle θ is reduced, the forward paint conveying effect is increased, but the atomization energy is reduced. Therefore, the inclination angle θ is set as a harmony point to avoid these disadvantages. The diameter of the particle size adjusting nozzle 55 is preferably, for example, from φ1.1 mm to φ1.3 mm. In this specification, the plurality of particle size adjustment nozzles 55 may be collectively referred to as a particle size adjustment nozzle unit.

As shown in FIG. 3, the cap 52 is attached to the gun body 10 so that a gap 60 is formed between the center opening end 52 </ b> H and the outer peripheral portion (outer peripheral end surface) of the pattern blowing nozzle 50. ing. Thus, the gap 60 is communicated with the air passage 46 and functions as a slit portion 60 through which compressed air from the air passage 46 is supplied to the tip of the pattern blowing nozzle 50. The slit portion 60 is formed to be inclined in a direction from the front of the pattern blowing nozzle 50 toward the tip of the pattern blowing nozzle 50, and the inclination angle γ is about 90 °. Moreover, the width of the slit part 60 is 0.3 mm or more and 0.7 mm or less, for example. FIG. 6 is a photograph of the front of the tip of the barrel part of the spray gun, where (a) shows the case where the slit part 60 is formed, and (b) shows the case where the slit part 60 is not formed. Show. In the actual machine test, as shown in FIGS. 6A and 6B, the paint ejected from the paint jet nozzle 22 of the paint jet nozzle section 20 to the cap 52 and the like by the slit air supplied from the slit section 60. It was confirmed that the adhesion amount was significantly reduced.

In the configuration described above, the sum of the opening areas of the particle size adjusting nozzles 55 in the particle size adjusting nozzle part is A, the total opening area in the slit part 60 is B, and the pattern blowing nozzles 50 in the pattern blowing nozzle part. When the total area of the openings is C, the relationship of A <B <C is established. In this case, it has been confirmed that the ratio of A, B, and C is preferably a ratio of 1: 2: 2.5, for example.

The spray gun configured as described above has a plurality of pattern blowing nozzles 50 for ejecting compressed air substantially in parallel with the paint jetting direction behind the paint jet nozzle part 20, so that the spray gun from the paint jet nozzle part 20 is arranged. It becomes possible to ensure straightness of the spray of paint. The particle size adjusting nozzle 55 formed on the cap 52 sprays the compressed air obliquely against the paint ejected from the paint ejection nozzle section 20, so that the atomization of the paint is performed without impairing the straightness of the paint ejection direction. Can be promoted. For this reason, the uniformity of the pattern of the coating material can be achieved. Further, the spray gun configured as described above has a function of adjusting the flow rate of the compressed air and can change the degree of atomization of the paint. For this reason, it becomes possible to achieve both the base blowing process and the pattern blowing process with the same nozzle and cap.

As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

The above embodiments may be arbitrarily combined.

This application claims priority based on Japanese Patent Application No. 2014-32342 filed on Feb. 21, 2014. The entire disclosure including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2014-32342 filed on Feb. 21, 2014 is incorporated herein by reference in its entirety.

DESCRIPTION OF SYMBOLS 1 Spray gun 10 Gun main body 11 Gun barrel part 12 Paint supply port 14 Grip part 20 Paint jet nozzle part 21 Needle 21A Needle valve 22 Paint jet outlet 23 Paint jet amount adjustment knob 30 Trigger 41 Air nipple 42 Air passage 43 Air valve part 44 Air passage 45 Air valve rod 46 Air passage 50 Pattern blowing nozzle 52 Cap 52H Central opening end 52W Inner wall surface 53 Cap cover 55 Particle size adjustment nozzle 57 Particle size adjustment valve 58 Particle size adjustment knob 59 Adjustment valve rod 60 Clearance (slit portion)

Claims

An external mixing spray gun for pattern blowing,
A gun body having a paint jet nozzle for jetting paint;
A plurality of pattern blowing nozzles, which are provided on the gun body side from the paint jet nozzle part and jet air in substantially parallel to the paint jet direction, are substantially equally spaced in the circumferential direction in the front view of the paint jet nozzle part, and A pattern blowing nozzle portion disposed at a position that is substantially the same distance from the paint ejection nozzle portion;
A cap mounted so as to cover the outer periphery of the paint jet nozzle part,
The cap has a central opening end having an opening equal to or larger than the outer diameter of the paint ejection nozzle part, and an inner wall surface that is connected to the central opening end and is inclined so that an inner diameter is widened in the paint ejection direction.
The cap includes a plurality of particle size adjusting nozzles for ejecting paint particle size adjusting air in the front view, the position of the inner wall surface being substantially equal in the circumferential direction and substantially the same distance from the paint spray nozzle portion. Has a particle size adjustment nozzle part formed in
The particle size adjusting nozzle of the particle size adjusting nozzle with respect to an axis of the paint ejecting direction of the paint ejecting nozzle portion so that the particle size adjusting air is blown obliquely to the paint ejected from the paint ejecting nozzle portion. The particle size adjustment nozzle is formed such that the axis has a predetermined inclination angle,
The cap is attached to the gun body so that a slit portion formed by a gap is formed between the center opening end and the outer peripheral portion of the pattern blowing nozzle portion, and the slit portion is the pattern blowing nozzle. A spray gun characterized by supplying air to the head side.
2. The spray gun according to claim 1, wherein the predetermined inclination angle is an angle that converges on an axis of the paint spraying direction.
The particle size adjusting nozzle is disposed outside the range described by two straight lines drawn from the center of the paint spray nozzle portion so as to contact the outer periphery of the pattern blowing nozzle facing each other in the front view. The spray gun according to claim 1 or 2.
The particle size adjustment nozzle portion has a total opening area A that is the sum of the opening areas of the particle size adjustment nozzles,
The slit portion has a total opening area B;
The pattern blowing nozzle portion has a total opening area C obtained by summing the opening areas of the pattern blowing nozzles,
The spray gun according to any one of claims 1 to 3, wherein the relationship between the total opening areas is: total opening area A <total opening area B <total opening area C.
The spray gun according to any one of claims 1 to 4, wherein the gun body has a particle size adjusting unit that adjusts a supply amount of air supplied to the particle size adjusting nozzle unit.
The spray gun according to claim 2, wherein the predetermined inclination angle is an angle of 110 degrees or more and 140 degrees or less so that the predetermined inclination angle converges on an axis of the paint ejection direction.