Two-component mixing type paint sprayer and mixing nozzle built into it

Abstract

To provide a coating machine with excellent maintainability, and a mixing nozzle built in the same.SOLUTION: A coating machine comprises a mixing nozzle 2 which receives a first liquid and a second liquid, and mixes the first liquid and the second liquid. The mixing nozzle 2 has a surrounding wall 4 which surrounds a first passage 120 for supplying the first liquid and a second passage 122 for supplying the second liquid, and further, has an obstacle wall 6 which extends toward a nozzle axis Ax from the surrounding wall 4 and is so positioned as to face an outlet of the second passage 122 in vicinity of outlets of the first passage 120 and the second passage 122. The second liquid, which has come out of the second passage 122 due to the obstacle wall 6, is forcibly deflected in a flow direction thereof and the second liquid is s directed at or near the outlet of the first passage 120. The vicinity of the outlet of the first passage 120 constitutes a first mixing chamber 8. In the mixing chamber 8, the second liquid immediately after having come out of the second passage 122 contacts the first liquid immediately after having come out of the first passage 120, and starts mixing with the same.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a two-component mixing type coating machine and a mixing nozzle built into the machine. [Background technology]

[0002] Patent Document 1 discloses a sprayer having a function of mixing paints of different colors inside the sprayer. The sprayer disclosed in Patent Document 1 is a rotary atomizing electrostatic sprayer, and is equipped with two systems of paint feed tubes. The liquid paints supplied to the bell cup from each paint feed tube are ON / OFF controlled by independently controlled valves. A gear pump is provided between each paint feed tube and a paint source, and each gear pump is driven by an independently controlled servo motor. This controls the amount of each paint supplied to the bell cup through the two systems of paint feed tubes. This sprayer is typically used to create a gradation pattern on the surface of a workpiece by changing the mixing ratio of two colors of paint mixed inside the sprayer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-153184 A Summary of the Invention [Problem to be solved by the invention]

[0004] The rotary atomizer electrostatic sprayer of Patent Document 1 is equipped with a mechanism for mixing two liquids inside the sprayer. Specifically, the sprayer of Patent Document 1 has a static mixer as a mixing mechanism, and the static mixer is disposed between a bell cup and two paint feed tubes. This static mixer has multiple baffles for mixing. For this reason, paint components tend to accumulate on the baffles, which makes cleaning difficult and causes other problems such as poor maintainability. [Means for solving the problem]

[0005] An object of the present invention is to provide a coater having an internal mechanism for mixing two liquids, which is easy to maintain, and a mixing nozzle built into the coater.

[0006] The present invention is characterized by having a mechanism for actively starting mixing of two liquids immediately after they are discharged from a feed tube inside the coater. More specifically, the present invention basically comprises the following: A coating machine having a function of receiving a first liquid and a second liquid and mixing the first liquid and the second liquid, a mixing nozzle (2) having a peripheral wall (4) surrounding a first pipeline (110) that forms a first passage (120) for supplying the first liquid, and a second pipeline (112) that is located on the outer circumferential side of the first pipeline (110) and forms a second passage (122) for supplying the second liquid, The mixing nozzle (2) is a nozzle outlet (104a) located in front of the outlets of the first passage (120) and the second passage (122); a baffle wall (6) extending radially inward from the peripheral wall (4) toward the nozzle axis (Ax) between the nozzle discharge port (104a) and the outlet of the first passage (120) and the outlet of the second passage (122) and in the vicinity of the outlets of the first passage (120) and the second passage (122), and positioned opposite the outlet of the second passage (122), and forcibly deflecting the flow direction of the second liquid exiting the outlet of the second passage (122) radially inward, to direct the second liquid toward the outlet of the first passage (120) or its vicinity; a first mixing chamber (8) in which the second liquid, which is forcibly directed by the baffle wall (6) to an outlet of the first passage (120) or its vicinity, comes into contact with the first liquid exiting the first passage (120) and starts mixing; a second mixing chamber (10) adjacent to the first mixing chamber (8); The second mixing chamber (10) is followed by a third mixing chamber (12) which communicates with the nozzle outlet (104a). The above technical object is achieved by providing a sprayer characterized by the above.

[0007] According to the present invention, since it does not have the multiple baffle plates for stirring that are built into the interior of conventional coating machines, it is possible to provide a coating machine and a mixing nozzle that are easy to maintain. Also, by providing the baffle plate (6) described above, it is possible to start mixing the first liquid and the second liquid earlier than in the case where the baffle plate is not provided.

[0008] Other objects, functions and advantages of the present invention will become apparent from the following detailed description of preferred embodiments of the present invention. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a cross-sectional view of a first mixing nozzle incorporated in the coating machine of the first embodiment. [Diagram 2] FIG. 2 is an enlarged view of a baffle wall included in the first mixing nozzle shown in FIG. 1. [Diagram 3] FIG. 13 is a diagram for explaining a modified example of a baffle wall included in the first mixing nozzle. [Figure 4] FIG. 13 is a diagram for explaining that the inclination angle of the baffle wall may be an acute angle. [Diagram 5] FIG. 13 is a diagram for explaining that the baffle wall may be stepped. [Figure 6] 11 is a diagram for explaining the minimum extent to which a baffle wall located opposite an outlet of a base material passage needs to overlap the outlet of the base material passage. FIG. [Figure 7] FIG. 11 is a cross-sectional view of a second mixing nozzle incorporated in a coating machine according to a second embodiment. [Figure 8] FIG. 11 is a cross-sectional view of a third mixing nozzle incorporated in a coating machine according to a third embodiment. [Figure 9] FIG. 11 is a cross-sectional view of a fourth mixing nozzle incorporated in a coating machine according to a fourth embodiment. [Figure 10] FIG. 13 is a cross-sectional view of a fifth mixing nozzle incorporated in a coating machine according to a fifth embodiment. [Figure 11] FIG. 13 is a cross-sectional view of a sixth mixing nozzle incorporated in a coating machine according to a sixth embodiment. [Figure 12]FIG. 13 is a cross-sectional view of a seventh mixing nozzle incorporated in a coating machine of a seventh embodiment. [Figure 13] FIG. 13 is a cross-sectional view of an eighth mixing nozzle incorporated in a coating machine of an eighth embodiment. [Figure 14] FIG. 13 is a cross-sectional view of a ninth mixing nozzle incorporated in a coating machine of the ninth embodiment. [Figure 15] FIG. 13 is a cross-sectional view of a tenth mixing nozzle incorporated in a coating machine of the tenth embodiment. [Figure 16] FIG. 1 is a diagram for explaining an outline of a prototype rotary atomization type sprayer, and the sprayer shown is a comparative example. [Figure 17] FIG. 17 is a diagram for explaining the configuration of the mixing nozzle portion shown in FIG. 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0010] Prior to describing an embodiment of the present invention, a comparative example will be described with reference to Figures 16 and 17. While considering and examining a mechanism for mixing two liquids inside a sprayer, the inventors created a prototype shown in Figures 16 and 17 for verification. In Figure 16, reference numeral 100 denotes a prototype rotary atomization type sprayer. Reference numeral 102 denotes a bell cup. Paint is supplied to bell cup 102 through a mixing nozzle 104. Bell cup 102 has a paint retention chamber 106 formed by a partition wall 102a, and paint supplied from mixing nozzle 104 is sprayed from the outer periphery of bell cup 102 through paint retention chamber 106 and a number of small diameter paint passages 108.

[0011] 17, the mixing nozzle 104 has a feed tube 114 composed of inner and outer double tubes 110, 112 with a common axis Ax of the mixing nozzle 104, and the feed tube 114 forms a hardener passage 120 in the center, a base agent passage 122 on the periphery thereof, and a thinner passage 124 on the outermost periphery. The hardener passage 120 communicates with a hardener source 128 via a first ON / OFF valve 126. The base agent passage 122 communicates with a base agent (paint) source 132 via a second ON / OFF valve 130. The thinner passage 124 communicates with a thinner source 136 via a third ON / OFF valve 134.

[0012] A coating machine equipped with a mechanism for mixing a hardener and a base agent inside the coating machine is disclosed, for example, in WO 2008 / 081634.

[0013] 17, the mixing nozzle 104 has a mixing chamber 140 between the nozzle outlet 104a and the tip of the feed tube 114. The mixing chamber 140 has a shape that tapers toward the nozzle outlet 104a.

[0014] When the performance evaluation experiment of the coating machine 100 including the mixing nozzle 104 equipped with the two-liquid mixing mechanism, i.e., the mixing chamber 140, i.e., the coating machine 100 of the comparative example, was repeated, it was found that, depending on various conditions such as the flow rate, flow speed, viscosity, and shape of the mixing chamber of each paint, a mixing failure may occur immediately after starting. When the cause of this was considered, it was found that a phenomenon occurred in which one of the base agent and the hardener discharged from the feed tube 114 to the mixing chamber 140 reaches the nozzle outlet 104a first. A two-liquid mixed paint consisting of a base agent and a hardener is generally mixed so that the amount of the base agent is relatively larger than that of the hardener. It was found that, when this general two-liquid mixed paint is used, the base agent reaches the nozzle outlet 104a before the hardener, and only the base agent is supplied to the bell cup 102 from the nozzle outlet 104a and sprayed. This phenomenon causes the paint to harden poorly.

[0015] To address this issue, it is conceivable to control the start-up of the coater 100 by opening the first ON / OFF valve 126 that controls the hardener passage 120 before the second ON / OFF valve 130 that controls the base agent passage 122 so that the hardener and base agent are discharged from the nozzle outlet 104a in a synchronized manner. However, options other than this type of solution based on valve timing control are also desired, for example, because the viscosity of the paint, which is the base agent, changes depending on the environmental temperature.

[0016] Preferred embodiments of the present invention will be described below with reference to Figures 1 to 15. In the description of the embodiments of the present invention, the same elements as those in the comparative example (Figures 16 and 17) described above are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

[0017] First embodiment and its modifications (FIGS. 1 to 6) : The first mixing nozzle 2 included in the coater 150A of the first embodiment is a component that is functionally common to the mixing nozzle 104 of the prototype 100. The first mixing nozzle 2 has a baffle wall 6 that extends from a cylindrical surrounding wall 4 that surrounds the tip portion of the feed tube 114 toward the axis Ax, and the baffle wall 6 is positioned opposite the opening, i.e., the outlet, of the base material passage 122. The baffle wall 6, together with the surrounding wall 4 and the outlet of the feed tube 114, forms a first mixing chamber 8. The flow of the base material discharged from the base material passage 122 is indicated by arrows X.

[0018] Fig. 2 is an enlarged view of the baffle wall 6 and its vicinity of the first mixing nozzle 2. Referring to Fig. 2, immediately after being discharged from the base agent passage 122, the base agent (arrow X) collides with the baffle wall 6, and its flow direction is forcibly deflected, and the base agent moves toward the nozzle axis Ax of the first mixing nozzle 2 (arrow Y). In other words, the base agent that has come out of the base agent passage 122 is immediately forcibly directed toward the outlet of the hardener passage 120 by the baffle wall 6. On the other hand, the hardener passage 120 discharges the hardener in the direction of the arrow Z, that is, in the direction of the nozzle axis Ax.

[0019] As a result, the hardener comes into contact with the base agent in the vicinity of the outlet of the hardener passage 120 immediately after it leaves the hardener passage 120, and mixing of the base agent and the hardener is forcibly started. This means that the outlet portion of the hardener passage 120 and its vicinity constitute the first mixing chamber 8. The first mixing chamber 8 is defined by the surrounding wall 4, the baffle wall 6, and the outlet portion of the hardener passage 120 and its vicinity, and the flow direction of the base agent leaving the outlet of the base agent passage 122 is forcibly deflected by the baffle wall 6 and directed to the outlet of the hardener passage 120 or its vicinity. In this first mixing chamber 8, the base agent just after leaving the base agent passage 122 comes into contact with the hardener just after leaving the hardener passage 120 and starts mixing. This first mixing chamber 8 is present in the most upstream portion of the first mixing nozzle 2. This allows the base agent and the hardener to be forced into contact and mixed immediately after the start of the sprayer 150A, and as will be described later, the paint passes through the second mixing chamber 10 and the third mixing chamber 12, making it possible to discharge the paint in a thoroughly mixed state from the sprayer 150A.

[0020] 1, as described above, the inner pipe 110 defines a hardener passage 120 therein. A base agent passage 122 is defined between the inner pipe 110 and the outer pipe 112 located thereoutside. Referring to FIG. 1, the tip of the inner pipe 110 protrudes forward more than the tip of the outer pipe 112. This relative protrusion amount ΔEt is arbitrary, and as shown in FIG. 2 and the like, the protrusion amount ΔEt may be zero, that is, the tip of the inner pipe 110 and the tip of the outer pipe 112 may be located on the same vertical plane.

[0021] The first mixing nozzle 2 has a second mixing chamber 10 that extends cylindrically from the radial inner end 6a of the baffle wall 6 toward the nozzle outlet 104a, and also has a third mixing chamber 12 that extends from the second mixing chamber 10 toward the nozzle outlet 104a. The third mixing chamber 12 has a cylindrical shape and directly communicates with the nozzle outlet 104a. The second mixing chamber 10 and the third mixing chamber 12 are arranged successively on the axis Ax.

[0022] The diameter of the cylindrical second mixing chamber 10 is approximately equal to the diameter of the outlet of the hardener passage 120. The third mixing chamber 12 has a cylindrical shape and its diameter is smaller than the diameter of the second mixing chamber 10. Due to this difference in diameter, turbulence occurs in the flow of the two liquids that move from the second mixing chamber 10 to the third mixing chamber 12, and this turbulence promotes mixing of the two liquids in the third mixing chamber 12.

[0023] Although not particularly limited, the ratio of the cross-sectional area of ​​the second mixing chamber 10 to that of the third mixing chamber 12 is preferably, for example, 2 to 10 times, 2 to 6 times, or 2 to 3 times that of the third mixing chamber 12.

[0024] 1 denotes a cap member. The cap member 14 constitutes the tip portion of the first mixing nozzle 2, and the nozzle discharge port 104a, the third mixing chamber 12, and a part of the second mixing chamber 10 are formed in this cap member 14. The cap member 14 is incorporated into the first mixing nozzle 2 by being press-fitted into the relevant portion of the first mixing nozzle 2, and is integrated with the first mixing nozzle 2.

[0025] The angle of the baffle wall 6 with respect to the nozzle axis Ax will now be described. In Fig. 2, the angle at which an imaginary extension line of the baffle wall 6 intersects with the nozzle axis Ax is indicated by "α". In the first mixing nozzle 2, the angle α of the baffle wall 6 is a right angle (90°).

[0026] 3 to 6 are diagrams for explaining modified examples related to the baffle wall 6, and various modified examples disclosed in FIGS. 3 to 6 and combinations of these modified examples may be incorporated into the first mixing nozzle 2 (FIG. 1) and other embodiments shown in FIG. 7 and subsequent figures.

[0027] The baffle wall 6 shown in Figures 1 and 2 is composed of a flat wall surface, but the baffle wall 6 may be composed of a concave curved wall surface toward the base material passage 122, as shown in Figure 3, or may be composed of a convex curved wall surface toward the base material passage 122, as shown by the virtual line in Figure 3.

[0028] 4 and 5 are diagrams for explaining the intersection angle α between the imaginary extension line of the baffle wall 6 and the nozzle axis Ax. In the first mixing nozzle 2 of FIG. 1, the intersection angle α is a right angle as described above, but this intersection angle α is not limited to a right angle. The intersection angle α is an acute angle α as shown in FIG. (1) That is, the baffle wall 6 may be configured as an inclined wall in which the baffle wall inner end 6a approaches the outlet of the hardener passage 120 as it approaches the nozzle axis Ax. (1) 45°<α (1) <90°, preferably 60°<α (1) It should be <90°.

[0029] The baffle wall 6 is composed of a flat wall surface (FIG. 1), a concave curved wall surface (solid line in FIG. 3) toward the base material passage 122, or a convex curved wall surface (phantom line in FIG. 3) toward the base material passage 122, but may also be composed of a stepped wall surface having multiple steps as shown in FIG. 5.

[0030] The baffle wall 6 of the first mixing nozzle 2 shown in FIG. 1 has a wall surface size that faces the entire area of ​​the opening of the base material passage 122, and completely overlaps with the opening of the base material passage 122. FIG. 6 is a diagram for explaining the overlap rate of the baffle wall 6 with respect to the opening of the base material passage 122. In FIG. 6, the height of the opening of the base material passage 122 is indicated by H1. And the height of the baffle wall 6 corresponding to the height H1 of the opening of the base material passage 122 is indicated by H2. If the ratio of the height H2 of the baffle wall 6 to the outlet opening height H1 of the base material passage 122 is called the overlap rate, the overlap rate does not have to far exceed 100% as in the example shown in FIG. 1, but may be 50% or more, preferably 60% or more, and more preferably 65% ​​or more. If the discharge direction X (FIG. 1) of more than half of the base agent discharged from the base agent passage 122 is deflected radially inward (arrow Y in FIG. 1) by the baffle wall 6, this forcibly deflected base agent collides with the remainder of the base agent discharged from the base agent passage 122, affecting the flow direction of the remainder and generating turbulence in the flow of the base agent. This allows the hardener and base agent to immediately and actively come into contact with each other immediately after they leave the outlet of the hardener passage 120. As a result, the base agent and hardener start to mix near the outlet of the hardener passage 120.

[0031] Second embodiment (Figure 7) : The second mixing nozzle 60 included in the coater 150B of the second embodiment is also a modified example of the first mixing nozzle 2 (FIG. 1) described above. For this reason, the same elements as those of the first mixing nozzle 2 are given the same reference numerals, and the description thereof will be omitted as appropriate.

[0032] The second mixing chamber 10 directly connected to the first mixing chamber 8 included in the first mixing nozzle 2 was cylindrical, but the second mixing chamber 10 included in the second mixing nozzle 60 shown in Figure 7 has a barrel shape. That is, the second mixing chamber 10 has a shape in which the middle part in the longitudinal direction bulges outward in the radial direction. By making the second mixing chamber 10 in this barrel shape, the two-liquid mixture flowing through this second mixing chamber 10 is forced to flow in the radial direction and becomes turbulent, and this turbulence in the flow can promote mixing of the two liquids.

[0033] Third embodiment (Fig. 8) : The third mixing nozzle 62 included in the coater 150C of the third embodiment has a relatively small diameter relay passage 32 between the first mixing chamber 8 and the second mixing chamber 10. The diameter of the relay passage 32 is determined by the baffle wall inner end 6a. The diameter of the relay passage 32 is not particularly limited, but is preferably substantially the same as the outlet of the hardener passage 120 or smaller than the diameter of the outlet of the hardener passage 120.

[0034] The two liquids, i.e., the base agent and the hardener, that start to mix in the first mixing chamber 8 are disturbed as they pass through the relatively small diameter relay passage 32, and then enter the cylindrical second mixing chamber 10, which has a relatively larger diameter than the relay passage 32, and the two liquids diffuse radially outward. This phenomenon can promote the mixing of the two liquids.

[0035] Fourth embodiment (Fig. 9) : The fourth mixing nozzle 64 included in the coater 150D of the fourth embodiment is also a modified version of the third mixing nozzle 62 (FIG. 8) included in the coater 150C of the third embodiment described above.

[0036] The shape of the second mixing chamber 10 is arbitrary, and as shown in Fig. 9, the second mixing chamber 10 may have an inlet portion 10b on the upstream side of the cylindrical main body portion 10a and / or an outlet portion 10c on the downstream side of the cylindrical main body portion 10a. The inlet portion 10b may have a tapered shape that gradually expands in diameter from the relay passage 32 toward the cylindrical main body portion 10a. The outlet portion 10c may have a tapered shape that gradually reduces in diameter from the cylindrical main body portion 10a toward the third mixing chamber 12.

[0037] Fifth embodiment (Fig. 10) : The fifth mixing nozzle 66 included in the coater 150E of the fifth embodiment is also a modified version of the fourth mixing nozzle 64 (FIG. 9) included in the coater 150D of the fourth embodiment described above. As described above, the shape of the second mixing chamber 10 is arbitrary, and the fifth mixing nozzle 66 shown in FIG. 10 employs a barrel-shaped second mixing chamber 10.

[0038] Sixth embodiment (Fig. 11) : The sixth mixing nozzle 68 included in the coater 150F of the sixth embodiment has an intersection angle α between the imaginary extension line of the baffle wall 6 and the nozzle axis Ax, and this intersection angle is an acute angle α (1) This is a specific example where the intersection angle α is set to an acute angle α (1) As already described with reference to FIG. 4, it may be possible to

[0039] In FIG. 11, the shape of the second mixing chamber 10 is substantially the same as the shape described for the fourth mixing nozzle 64 shown in FIG. 9, however, this is merely an example, and the shape may be the same as the second mixing chamber 10 of the third mixing nozzle 62 shown in FIG. 8, or the shape may be the same as the second mixing chamber 10 of the fifth mixing nozzle 66 shown in FIG. 10.

[0040] Referring to FIG. 11, acute angle α (1) The baffle wall 6, which extends at an inclination angle of 10°, approaches the outlet of the hardener passage 120 as it approaches the nozzle axis Ax, and the baffle wall inner end 6a approaches the outlet of the hardener passage 120. As the baffle wall 6 inner end 6a approaches the inner diameter of the inner pipe 110, the baffle wall 6 has a guide function for guiding the base agent to the outlet of the inner pipe 110. In the illustrated sixth mixing nozzle 68, the inner end 6a of the baffle wall 6, i.e., the diameter of the relay passage 32, is smaller than the inner diameter of the inner pipe 110, so that the base agent coming out of the base agent passage 122 is reflected by the baffle wall 6 and is then guided by the baffle wall 6 and forcibly guided to the outlet of the hardener passage 120.

[0041] It is preferable that the outlet of the inner pipe 110 is chamfered. The chamfered portion is indicated by reference symbol 120a. This chamfered portion 120a guides a part of the hardener discharged from the inner pipe 110 to the chamfered portion 120a and directs it radially outward. As a result, in the first mixing chamber 8, the base agent that is guided by the baffle wall 6 and forcibly guided to the outlet of the hardener passage 120, the hardener that is facing this and trying to exit the hardener passage 120, and the hardener that is guided by the chamfered portion 120a and directed radially outward are mixed together, creating a state in which the base agent and the hardener are in active contact with each other.

[0042] In addition, the inner end 6a of the baffle wall 6, i.e., the diameter of the relay passage 32, is smaller than the inner diameter of the inner pipe 110, i.e., the diameter of the hardener passage 120, in other words, the diameter of the hardener passage 120 is larger than the diameter of the relay passage 32. For this reason, a phenomenon occurs in which a part of the hardener discharged from the hardener passage 120 flows in a reverse direction through the baffle wall 6 in the first mixing chamber 8. This makes it possible to extend the time that the base agent and the hardener are retained in the first mixing chamber 8, and also makes it possible to promote the mixing of the two liquids in the first mixing chamber 8 by the intense contact between the base agent and the hardener in the first mixing chamber 8.

[0043] Seventh embodiment (Fig. 12) : The seventh mixing nozzle 70 included in the coater 150J of the seventh embodiment is also a modified example of the sixth mixing nozzle 68 (FIG. 11) included in the coater 150F of the sixth embodiment described above. (1) The baffle wall 6 has an inclination angle of 0.05 mm, and its inner end 6a joins at the nozzle axis Ax to form a vertex P. That is, the baffle wall 6 has a conical shape that protrudes toward the outlet of the hardener passage 120 and has a vertex P on the nozzle axis Ax. As can be seen from FIG. 12, the first mixing chamber 8 and the second mixing chamber 10 are defined by the conical baffle wall 6. For this reason, in the closed first mixing chamber 8, the hardener and base agent start mixing immediately after they leave the hardener passage 120 and the base agent passage 122.

[0044] A plurality of through holes 34 are formed in the baffle wall 6, and the first and second mixing chambers 8 and 10 are connected to each other through the plurality of through holes 34. The through holes 34 have a smaller diameter than the relay passage 32 shown in FIG. 11 and the like. As a result, each through hole 34 constitutes a kind of orifice, and mixing of the two liquids is promoted when the mixed liquid of the base agent and the hardener in the first mixing chamber 8 passes through the plurality of through holes 34 and also when it enters the second mixing chamber 10. In particular, since each through hole 34 is a passage with a relatively small diameter, when the mixed liquid leaves the through hole 34 and enters the second mixing chamber 10, pressure is released from the mixed liquid, and the mixed liquid diffuses into the second mixing chamber 10, which also promotes mixing of the two liquids.

[0045] It is preferable that the multiple through holes 34 are set so that their orientation directions are different. As a result, the mixed liquid flowing into the second mixing chamber 10 from the multiple through holes 34 oriented in different directions is discharged in various directions in the second mixing chamber 10. As a result, significant turbulence occurs in the flow of the mixed liquid flowing into the second mixing chamber 10, which promotes the mixing of the base agent and the hardener.

[0046] Various aspects of the baffle wall 6 and various shapes of the second mixing chamber 10 that can be applied to the present invention have been described above. In other words, it has been described that the aspects of the baffle wall 6 and the second mixing chamber 10 are not limited to the aspects shown in each drawing. Based on this, the eighth and ninth embodiments shown in Figs. 13 and 14 will be described.

[0047] Eighth embodiment (Fig. 13) : The eighth mixing nozzle 72 included in the coater 150K of the eighth embodiment has a characteristic internal structure in the vicinity of the outlet of the hardener passage 120. Therefore, other than the hardener passage 120, such as the inclination angle of the baffle wall 6 and the shape of the second mixing chamber 10, are not limited to the embodiment shown in FIG.

[0048] Referring to FIG. 13, a cylindrical member 36 having, for example, a twist groove 36a on its inner surface is press-fitted near the outlet of the hardener passage 120. By disposing this cylindrical member 36 near the outlet of the hardener passage 120, the flow of the hardener discharged from the hardener passage 120 is twisted. A chamfered portion 120a is preferably formed at the outlet of the hardener passage 120. The flow of the hardener discharged in a twisted state from the hardener passage 120 is directed radially outward by the chamfered portion 120a. Then, this hardener collides with the base agent discharged from the base agent passage 122 and forcibly directed radially inward by the baffle wall 6, promoting mixing.

[0049] Ninth embodiment (Fig. 14) : The ninth mixing nozzle 74 included in the coater 150L of the ninth embodiment, like the eighth mixing nozzle 72 (FIG. 13) described above, has a characteristic internal structure near the outlet of the hardener passage 120. Therefore, other than the hardener passage 120, such as the inclination angle of the baffle wall 6 and the shape of the second mixing chamber 10, are not limited to the embodiment shown in FIG.

[0050] 14, a cylindrical member 38 having a plurality of circumferential grooves 38a is press-fitted into the inner surface of the inner pipe 110 near the outlet of the hardener passage 120. By disposing the circumferential grooves 38a near the outlet of the hardener passage 120, the flow of the hardener discharged from the hardener passage 120 is disturbed. Then, the hardener discharged in a disturbed state from the hardener passage 120 collides with the base agent discharged from the base agent passage 122 and forcibly directed radially inward by the baffle wall 6, promoting mixing.

[0051] The nozzles 2, 60, 62, 64, 66, 68, 70, 72, 74 equipped with the feed tube 114 consisting of concentric inner and outer multiple tubes have been described above with reference to Figures 1 to 14. The present invention is not limited to a sprayer equipped with the feed tube 114 consisting of concentric inner and outer multiple tubes.

[0052] Tenth embodiment (Fig. 15) : The tenth mixing nozzle 76 included in the coater 150M of the tenth embodiment has a first pipe 80 and a second pipe 82 arranged side by side. The first pipe 80 forms a hardener passage 120, and the second pipe 82 forms a base passage 122. Generally, the base is present in a larger amount than the hardener. It is preferable to place a baffle wall 6 near the outlet of the base passage 122 for the relatively large amount of base. The flow direction of the base coming out of the base passage 122 is forcibly directed by the baffle wall 6 to the vicinity of the outlet of the hardener passage 120. As a result, the vicinity of the outlets of the base passage 122 and the hardener passage 120 constitute the first mixing chamber 8.

[0053] The base agent exiting the base agent passage 122 is directed near the outlet of the hardener passage 120, so that the hardener comes into contact with the base agent immediately after exiting the hardener passage 120 and begins mixing with the base agent. The coater 150M, like the coater 150A described in FIG. 1 and other figures, is provided with the first mixing chamber 8 followed by the second and third mixing chambers 10, 12, and these first to third mixing chambers 8, 10, 12 constitute a mixing mechanism located inside the tenth mixing nozzle 76, just like the coater 150A described above.

[0054] The sprayers 150A to 150M according to the present invention have a thinner passage 124 on the outermost periphery, and the inside can be washed at any time by the thinner, that is, the cleaning agent, supplied through this thinner passage 124.

[0055] According to the coating machines 150A to 150M of the present invention, it is possible to discharge from the coating machines 150A to 150M a two-component mixed paint in which the base agent and the hardener are sufficiently mixed immediately after the start of the coating machines 150A to 150M. The coating machines 150A to 150M of the present invention are applicable not only to low-solid paints with a solid content of 10 to 15% or 30%, but also to high-solid paints with a solid content of 32% to 37% or 41% to 55%, and it is possible to discharge from the coating machines 150A to 150M a two-component mixed paint in which the base agent and the hardener are sufficiently mixed immediately after the start of the coating machines 150A to 150M.

[0056] The above describes the first to tenth embodiments of the coating machines 150A to 150M using two-component mixed paint that mixes a base agent and a hardener. However, the coating machine according to the present invention can also be used in a coating machine that mixes two different color paints inside the coating machine, as in Patent Document 1. [Explanation of symbols]

[0057] 102 Bell Cup 104 Mixing nozzle included in prototype sprayer Ax: Center axis of nozzle 104a Nozzle outlet 110, 112 Concentric inner and outer double pipes (110 inner pipe, 112 outer pipe) 120 Hardener passage 122 Main Agent Passage 124 Thinner Passage 150A First embodiment of the sprayer 2. First mixing nozzle included in the coating machine of the first embodiment 4 Cylindrical surrounding wall 6 Obstacles 6a Inner end of obstruction wall 8 1st mixing chamber 10 Second mixing chamber 12 3rd mixing chamber 32 A relay passage connecting the first mixing chamber and the second mixing chamber

Claims

1. A coating machine having a function of receiving a first liquid and a second liquid and mixing the first liquid and the second liquid, a mixing nozzle having a peripheral wall surrounding a first pipe forming a first passage for supplying the first liquid, and a second pipe located on an outer circumferential side of the first pipe and forming a second passage for supplying the second liquid, The mixing nozzle comprises: a nozzle outlet located in front of the outlets of the first passage and the second passage; a baffle wall extending radially inward from the peripheral wall toward the nozzle axis and positioned opposite the outlet of the second passage between the nozzle discharge port and the outlet of the first passage and the outlet of the second passage and in the vicinity of the outlets of the first passage and the second passage, and forcibly deflecting the flow direction of the second liquid discharged from the outlet of the second passage inward in the radial direction, so as to direct the second liquid toward the outlet of the first passage or its vicinity; a first mixing chamber in which the second liquid forcedly directed by the baffle wall to an outlet of the first passage or its vicinity comes into contact with the first liquid exiting the first passage and starts mixing; A second mixing chamber adjacent to the first mixing chamber; a third mixing chamber connected to the second mixing chamber and communicating with the nozzle outlet,

2. 2. The sprayer of claim 1, wherein the second fluid is in an amount greater than the first fluid.

3. 3. The sprayer according to claim 2, wherein the first liquid is a hardener and the second liquid is a base resin.

4. The first pipe and the second pipe are constituted by an inner and outer double pipe having a common axis line along the nozzle axis, 4. The sprayer according to claim 3, wherein the nozzle outlet is located on the nozzle axis.

5. 5. The sprayer according to claim 1, wherein an overlap ratio of the baffle wall, which is a ratio of a height of the baffle wall to a height of an outlet opening of the second passage, is 50% or more.

6. 6. The sprayer according to claim 1, wherein an intersecting angle between an imaginary extension line of the baffle wall and an axis of the nozzle is a right angle.

7. 6. The coater according to claim 1, wherein an intersection angle between an imaginary extension line of said baffle wall and said nozzle axis line is an acute angle, and said baffle wall is configured as an inclined wall whose inner end approaches the outlet of said first passage as it approaches the nozzle axis line.

8. 8. The sprayer of claim 7, wherein an outlet portion of said first passageway is chamfered.

9. The mixing chamber further includes a relay passage that communicates between the first mixing chamber and the second mixing chamber, 9. The sprayer of claim 8, wherein a diameter of the relay passage is equal to or smaller than a diameter of the first passage.

10. 10. The sprayer of claim 9, wherein a diameter of the second mixing chamber is greater than a diameter of the first passageway.

11. The sprayer according to any one of claims 1 to 10, wherein the diameter of the third mixing chamber is smaller than the diameter of the second mixing chamber.

12. The coater according to any one of claims 1 to 11, wherein the coater is a rotary atomizing type electrostatic coater equipped with a rotary atomizing head.

13. A mixing nozzle to be incorporated in a coating machine having a function of receiving a first liquid and a second liquid and mixing the first liquid and the second liquid, a peripheral wall surrounding a first pipe forming a first passage for supplying the first liquid and a second pipe forming a second passage for supplying the second liquid; a nozzle outlet located in front of the outlets of the first passage and the second passage; a baffle wall extending from the peripheral wall toward the nozzle axis and positioned opposite the outlet of the second passage between the nozzle discharge port and the outlet of the first passage and the outlet of the second passage and in the vicinity of the outlets of the first passage and the second passage, and forcibly deflecting the flow direction of the second liquid discharged from the outlet of the second passage to direct the second liquid toward the outlet of the first passage or its vicinity; a first mixing chamber in which the second liquid forcedly directed by the baffle wall to an outlet of the first passage or its vicinity comes into contact with the first liquid exiting the first passage and starts mixing; A second mixing chamber adjacent to the first mixing chamber; a third mixing chamber connected to the second mixing chamber and communicating with the nozzle outlet port,

14. 14. The mixing nozzle of claim 13, wherein a diameter of the third mixing chamber is smaller than a diameter of the second mixing chamber.

15. 14. The mixing nozzle of claim 13, further comprising a relay passage between said first mixing chamber and said second mixing chamber.

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