JP2002102751A - Two-component mixed coating equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reliably mix a main agent and a curing agent with a simple structure so that a high-quality coating operation can be efficiently performed. A double pipe nozzle has an inner pipe and an outer pipe.
And a hardener passage 66 is provided in the inner tube 50, while a main agent passage 68 is provided between the inner tube 50 and the outer tube 52. The distal end portion 50a of the inner tube 50 is provided with a tapered surface 70 for releasing the curing agent 22 at a predetermined release angle α1 °, and the outer peripheral surface of the distal end portion 50a is provided with the main agent 14 at a predetermined release angle. A cone 72 for emission at α2 α is formed. And the angle α1 ゜ is
The angle is set to be larger than the angle α2 °.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of supplying a main agent and a curing agent individually to respective passages of a double tube nozzle provided in a rotary atomizing head, and mixing the main agent and the curing agent to form a coating. The present invention relates to a two-liquid mixed coating apparatus that atomizes and discharges a coating object.

[0002]

2. Description of the Related Art For example, when coating an object to be coated such as an automobile body, a two-component mixing coating apparatus is used in which a main agent and a curing agent are mixed and discharged from a coating gun. As this type of apparatus, for example, a two-liquid mixed coating apparatus disclosed in JP-A-2000-126654 is known.

In the above-mentioned prior art, as shown in FIG.
The coating machine 1 includes an inner tube 2, an outer tube 3 coaxially disposed on the outer periphery of the inner tube 2, and a coaxially disposed outer periphery of the outer tube 3. Rotatable shaft 4
And a bell cup 5 provided at the tip of the shaft 4
And a lid 6 provided at the tip of the bell cup 5. While the main agent 7 is supplied to the inner tube 2, a curing agent 8 is supplied between the inner tube 2 and the outer tube 3.

Therefore, the bell cup 5 is driven by an air motor or the like.
Is rotated at a high speed, the main agent 7 supplied to the inner tube 2 and the curing agent 8 supplied between the inner tube 2 and the outer tube 3 are mixed, and the paint is removed from the gap 9 of the bell cup 5 to the outside. And applied to an object not shown.

[0005]

However, in the above-mentioned prior art, the main agent 7 and the hardener 8 are individually supplied while being blocked by a double tube, and the main agent 7 is hardened by the inner tube 2.
Is discharged into the bell cup 5 in the direction of arrow H, while the hardener 8 is discharged into the bell cup 5 in the direction of arrow H from between the inner tube 2 and the outer tube 3. I have. As described above, since the main agent 7 and the curing agent 8 are discharged into the bell cup 5 in the same direction, even if the main agent 7 and the curing agent 8 are guided along the inner shape of the lid 6, the main agent 7 and the hardening agent 8 remain in the bell cup 5. And the curing agent 8 may not be sufficiently mixed. As a result, the mixed state of the main agent 7 and the curing agent 8 tends to fluctuate, and the problem that the quality of the coating film becomes unstable is pointed out.

Further, the main agent 7 hardly changes in viscosity even when it comes into contact with air or moisture, whereas the curing agent 8 hardens in a short time when it comes into contact with air or moisture. It easily adheres to the outer surface of the tip 2a of the inner tube 2 and hardens.
Therefore, if there is a hardened material that has adhered and hardened to the distal end 2a of the inner tube 2, there is a problem that the amount and direction of discharge of the hardener 8 changes, and the coating quality becomes unstable.

The present invention is intended to solve this kind of problem. With a simple structure, it is possible to surely mix a main agent and a curing agent to maintain a desired mixed state, and to effectively improve coating quality. It is an object of the present invention to provide a possible two-component mixed coating apparatus.

[0008]

According to the present invention, there is provided a two-liquid mixing / coating apparatus, wherein a double-pipe nozzle having an outer pipe and an inner pipe is provided in a rotary atomizing head, and is provided via the double-pipe nozzle. The main agent and the curing agent, which are liquids, are supplied separately, and the liquid discharge angle from the inner tube is set to an angle larger than the liquid discharge angle from the gap between the inner tube and the outer tube. I have.

For this reason, the main agent and the curing agent discharged from the double tube nozzle are supplied directly into the rotary atomizing head in a state of being directly mixed in the air. As a result, the mixing state of the main agent and the curing agent can be effectively improved, and the paint sprayed and ejected from the rotary atomizing head is reliably maintained at a predetermined mixing ratio, and high quality is achieved for the object to be coated. It is possible to reliably carry out a proper coating treatment. In addition, it is only necessary to set each liquid agent discharge angle, and the configuration is not complicated, and the apparatus is economical.

In the double tube nozzle, a hardener passage for supplying a hardener to the inner tube is provided, while a main agent passage for supplying the main agent to a gap between the inner tube and the outer tube is provided. ing. Therefore, the curing agent does not adhere to the outer peripheral surface of the inner tube at the tip end portion and is hardened, so that the variation in the discharge amount and the discharging direction of the liquid material by the cured product can be effectively prevented, and the coating process of stable quality can be performed. Performed efficiently.

[0011]

FIG. 1 is a schematic structural explanatory view of a two-liquid mixed coating apparatus 10 according to an embodiment of the present invention.

The coating apparatus 10 includes a main agent supply path 18 for supplying the main agent 14 fed from the first color changing valve mechanism 12 to the coating machine 16, and a curing agent 22 fed from the second color changing valve mechanism 20. And a curing agent supply path 24 for supplying the coating agent to the coating machine 16.

The first color changing valve mechanism 12 includes a first cleaning valve 26 for controlling the supply of air (A), cleaning liquid (S), and the like;
A plurality of switching valves 28a to 28d capable of supplying the main agent 14 corresponding to paints of different colors are provided. Second
Similarly, the color changing valve mechanism 20 includes a second cleaning valve 30 that controls the supply of the air (A), the cleaning liquid (S), and the like, and a plurality of the curing agents 22 that can supply the curing agent 22 corresponding to the paint of a different color. Switching valves 32a to 32i. Each of the switching valves 28a to 28d and 32a to 32i is connected to a storage tank for the main agent and a storage tank for the hardener not shown.

Main agent supply path 18 and curing agent supply path 24
Are disposed on the upstream side of the first and second gear pumps 34 and 36 for pumping the main agent 14 and the curing agent 22 to the coating machine 16 side, and the first and second gear pumps 34 and 36 A first method for controlling the main agent 14 and the hardener 22 supplied to the gear pumps 34 and 36 to a predetermined pressure.
And second pressure control valves 38 and 40. First
The first and second gear pumps 34 and 36 have first and second gear pumps.
Servo motors 42 and 44 are connected.

Trigger valves 46a and 46b and a drain valve 48 are provided at the outlet side of the main agent supply passage 18 and the hardening agent supply passage 24, respectively.
a, 48b are connected to the main agent supply path 18 and the curing agent supply path 24, and the trigger valves 46a, 46b
The inner pipe 50 and the outer pipe 52 constituting the double pipe nozzle 49 provided in the coating machine 16 are connected to be openable and closable via the.

As shown in FIG. 2, the coating machine 16 includes an air motor 56 incorporated in a casing 54, and the cylindrical rotary shaft 5 driven to rotate via the air motor 56.
8 is rotatably supported in the casing 54 via a bearing 59. At the tip of the rotary shaft 58, a rotary atomizing head 6
The hub member 64 is attached to the inner wall surface 62 of the rotary atomizing head 60.

Inside the rotary shaft 58, the inner tube 50 and the outer tube 52 are coaxially arranged to form a double tube nozzle 49, and the tip 50a of the inner tube 50 is connected to the tip of the outer tube 52. It protrudes forward from the portion 52a by a predetermined length.
A hardener passage 66 is provided in the inner tube 50, and the hardener passage 66 can communicate with the hardener supply passage 24. Inner tube 5
A main agent passage 68 is provided between the outer tube 52 and the outer tube 52, and the main agent passage 68 can communicate with the main agent supply passage 18.

As shown in FIG. 3, the distal end portion 50 of the inner tube 50 is provided.
A is provided with a tapered surface 70 which communicates with the curing agent passage 66 and forms a tapered hole whose diameter gradually increases toward the front (in the direction of arrow H) of the distal end portion 50a. Angle α1 between tapered surface 70 and axis O of double tube nozzle 49
゜ is a liquid agent discharge angle for discharging the curing agent 22 from the inner tube 50 into the rotary atomizing head 60. A conical portion 72 gradually increasing in diameter toward the front is provided on the outer peripheral surface of the tip portion 50a.
Are formed to bulge, and the outer surface 72a of the conical portion 72 is formed.
An angle α2 ° between the axis and the axis O is a liquid agent discharge angle for discharging the main agent 14 into the rotary atomizing head 60.

The angle α1 ° for releasing the curing agent 22 is set to be larger than the angle α2 ° for releasing the main agent 14, and in the present embodiment, the angle α1 ° is set to 45 °. At the same time, the angle α2 ° is set to 30 °. The distal end portion 52a of the outer tube 52 has a tapered shape whose diameter increases toward the front.

As shown in FIG. 1, the coating machine 16 has a third
And fourth cleaning valves 74 and 76 are provided, and drain lines 78 a and 78 b are connected to the coating machine 16. Similarly, the drain valves 48a and 48b have drain lines 8 respectively.
0a and 80b are connected.

The operation of the coating apparatus 10 configured as described above will be described below.

First, the first and second color changing valve mechanisms 12,
In 20, for example, by opening the switching valves 28 a, 32 a, the main agent 14 and the curing agent 22 corresponding to the predetermined paint are applied to the first and second color change valve mechanisms 12, 2.
From 0, it is fed under pressure to the main agent supply path 18 and the curing agent supply path 24.

At this time, the first and second gear pumps 34,
Drive 36 is controlled by first and second servomotors 42 and 44, and downstream of the main agent supply passage 18 and the curing agent supply passage 24 via the first and second gear pumps 34 and 36, respectively. A predetermined amount of the base material 14 and the curing agent 22 are pumped. Further, the main agent 14 and the curing agent 22
Is supplied to the main agent passage 68 and the hardener passage 66 under the opening action of the trigger valves 46a and 46b (see FIG. 1).

On the other hand, in the coating machine 16, as shown in FIG. 2, a rotary shaft 58 is driven to rotate by an air motor 56 while being supported by a bearing 59, and is integrally attached to the rotary shaft 58. The rotating atomizing head 60 is rotating.

In this case, in this embodiment, as shown in FIG. 3, an angle α1 ° with respect to the axis O is formed at the tip end side of the curing agent passage 66 provided in the inner tube 50 via the tapered surface 70. While the release angle of the curing agent 22 having is set,
A discharge angle of the main agent 14 having an angle α2 ° with respect to the axis O via the conical portion 72 is set at the distal end side of the main agent passage 68, and the angle α1 ° has an angle larger than the angle α2 °. .

Therefore, as shown in FIG. 4, the hardener 22 discharged from the front end side of the hardener passage 66 and the main agent passage 6
The main agent 14 discharged from the front end of the nozzle 8 is supplied into the rotary atomizing head 60 in a state of being directly mixed in the air near the front end of the double tube nozzle 49. Thereby, the rotary atomizing head 60
Under the rotating action of the above, the paint sprayed and ejected from the rotary atomizing head 60 to the object to be coated (not shown) is such that the main agent 14 and the curing agent 22 are surely mixed in a desired mixing state (mixing ratio). There is an effect that a stable coating quality can be always obtained.

Further, in this embodiment, the double pipe nozzle 4
The hardener 22 is supplied to a hardener passage 66 provided in the inner tube 50 constituting the inner tube 9, and the main agent 14 is supplied to a main agent passage 68 provided between the inner tube 50 and the outer tube 52. ing. Here, the main agent 14 is, for example, acrylic,
Urethane, polyester urethane, acryl urethane, or the like is used, and a change in viscosity is unlikely to occur even when exposed to air or moisture. On the other hand, the curing agent 22 uses, for example, isocyanate, and has a property of being cured in a short time when exposed to air or moisture.

Therefore, in the structure in which the main agent 14 is supplied to the inner passage of the double tube nozzle 49 and the hardener 22 is supplied to the outer passage of the double tube nozzle 49, the inner tube 5
The hardener 22 adheres to the leading end portion 50a of the hardener and hardens, and the amount and direction of discharge of the hardener 22 may fluctuate and the quality of the coating film may not be stable.

Therefore, in the present embodiment, the hardener 22 is supplied into the inner tube 50, and the main agent 14 is supplied between the inner tube 50 and the outer tube 52. An advantage is obtained in that a hardening agent does not adhere to the outer surface of 50a and is hardened, and a stable coating process can be effectively maintained.

By the way, if the interval between the coating by the coating machine 16 and the start of the next coating is relatively long, the double pipe nozzle 49 is cleaned. That is, after the supply of the main agent 14 and the curing agent 22 is stopped, in the second color change valve mechanism 20, the second cleaning valve 30 is opened, and the cleaning liquid is sent to the curing agent supply path 24. At this time, while the first gear pump 34 is stopped, the second gear pump 36 is driven, the cleaning liquid is pumped into the hardening agent supply path 24, and the cleaning liquid is introduced into the curing agent path 66 constituting the coating machine 16. You. This cleaning liquid is supplied to the curing agent passage 66.
After the inner surface of the inner tube 50 is washed by flowing through, the liquid is discharged from the tip of the rotary atomizing head 60.

Next, after the washing of the double tube nozzle 49 is performed, the second washing valve 30 is closed in the second color changing valve mechanism 20, while, for example, the switching valve 32a is opened. Therefore, under the action of the second gear pump 36, the curing agent 22 is pressure-fed to the curing agent supply path 24 to perform a filling operation. After the filling of the curing agent 22 is completed, the main agent 14 is supplied to the main agent passage 68 and the curing agent passage 66 is driven by the first and second gear pumps 34 and 36.
The hardener 22 is supplied to the main agent 14 and the hardener 2
2 is supplied directly into the rotary atomizing head 60 in a state of being mixed in the air. Therefore, the main agent 14 and the curing agent 22 are sufficiently mixed, and a desired coating operation on the object to be coated (not shown) is restarted.

In this embodiment, the outer surface of the inner tube 50 is cleaned by the second cleaning valve 30 constituting the second color changing valve mechanism 20, but the present invention is not limited to this. The inner surface of the inner tube 50 can be cleaned via the cleaning valve 74.

In the present embodiment, the double tube nozzle 49
The hardener 22 is supplied to the inner passage (hardener passage 66) of the double tube nozzle 49 while the outer passage (main agent passage 6) of the double pipe nozzle 49 is supplied.
8), the main agent 14 is supplied. Conversely, the main agent 14 may be supplied to the inner passage and the hardener 22 may be supplied to the outer passage. At this time, the liquid agent discharge angle from the inner tube 50 is different from the inner tube 50 and the outer tube 52.
By setting the angle to be larger than the liquid agent discharge angle from the gap, the main agent 14 and the curing agent 22 can be supplied into the rotary atomizing head 60 in a sufficiently mixed state. As a result, the mixed state of the main agent 14 and the curing agent 22 is reliably maintained, and a high-quality coating operation is efficiently performed.

[0034]

According to the present invention, there is provided a two-package coating apparatus having a double-pipe nozzle to which a base material and a hardening agent, which are liquids, are separately supplied, and an inner pipe from the inner pipe constituting the double-pipe nozzle. The liquid agent discharge angle is set to an angle larger than the liquid agent discharge angle from the gap between the inner tube and the outer tube. Thereby, the main agent and the curing agent are directly supplied into the rotary atomizing head in a state of being mixed in the air.

For this reason, with a simple structure, the mixing state of the main agent and the curing agent can be effectively improved, and the paint can be atomized and discharged onto the object at a desired mixing ratio. Is efficiently performed.

[Brief description of the drawings]

FIG. 1 is a schematic structural explanatory view of a two-liquid mixed coating apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory sectional view of a main part of a coating machine constituting the coating apparatus.

FIG. 3 is an explanatory view of a double pipe nozzle constituting the coating machine.

FIG. 4 is an operation explanatory view of the double tube nozzle shown in FIG. 3;

FIG. 5 is an explanatory cross-sectional view of a coating machine constituting a two-liquid mixed coating apparatus according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Two-liquid mixing coating device 12 ... 1st color change valve mechanism 14 ... Main agent 16 ... Coating machine 18 ... Main agent supply path 20 ... 2nd color change valve mechanism 22 ... Hardener 24 ... Hardener supply path 26, 30, 74 , 76 ... Washing valve 28a-28d, 32a-32i ... Switching valve 49 ... Double pipe nozzle 50 ... Inner pipe 50a, 52a ... Tip 52 ... Outer pipe 54 ... Casing 60 ... Rotary atomizing head 66 ... Hardener passage 68 ... Main agent passage 70 ... Tapered surface 72 ... Conical portion 72a ... Outer surface

Continued on the front page (72) Inventor Yoshiyoshi Nozaki 1-10-1 Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (72) Inventor Hidenori Taguchi 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. Company F-term (reference) 4F033 QA01 QB03X QB18 QD02 QD15 QE09 QE24

Claims (2)

[Claims] A double nozzle having an outer tube and an inner tube is provided in a rotary atomizing head for atomizing a paint, and a main agent as a liquid agent and a curing agent are provided through the double tube nozzle. Are separately supplied, thereby mixing and mixing the main agent and the curing agent, and atomizing and discharging the mixture to the object to be coated. An angle larger than a liquid agent discharge angle from a gap between the inner tube and the outer tube is set, and the main agent and the curing agent are supplied into the rotary atomizing head in a state of being mixed in the air. Two-component mixed coating equipment. 2. The apparatus according to claim 1, wherein the inner tube is provided with a curing agent passage to which the curing agent is supplied, while the gap between the inner tube and the outer tube contains the main agent. A two-component mixed coating apparatus, wherein a supply path of a main agent is provided.