JP2000126654A - Two-pack mixing coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-pack mixing coating device which is simple in its structure and in which there is not hardening of coating in a coating path of a coater. SOLUTION: This device has a coater 2 consisting of an inner pipe 21, an outer pipe 22 disposed on the outer periphery thereof, a rotatable shaft 23 disposed on the outer periphery of the outer pipe, a bell cup 24 attached on the head of the shaft, and a cover 25 disposed on the head of the bell cup and also it has a main agent tank 4 connected to the inner pipe through a main agent pipe 41 and a curing agent tank 5 connected to the inner pipe through a curing agent pipe 51. A main agent 40 fed to a main agent path in the inner pipe from the main agent tank and a curing agent 50 fed to a curing agent path between the inner pipe and the outer pipe from the curing agent tank are mixed within the bell cup 24 rotated at high speed to spray the mixture from the bell cup 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-component mixture coating apparatus capable of mixing and spraying a main agent and a curing agent by a coating machine.

[0002]

2. Description of the Related Art When spray coating an automobile body or the like, a two-pack coating apparatus (Japanese Patent Application Laid-Open No. 8-71459) is generally used in which a main agent and a curing agent are mixed by a mixer. As shown in FIG. 4, the conventional two-component mixed coating apparatus 9 includes a coating gun 92 as a coating machine and a mixer 93.
And a main agent tank 94 and a curing agent tank 95.
The main agent tank 94 is connected to a mixer 93 via a main agent pipe 941, and the curing agent tank 95 is connected to the mixer 93 via a curing agent pipe 951.

[0003] The main agent supplied from the main agent tank 94 into the mixer 93 and the curing agent supplied from the curing agent tank 95 into the mixer 93 are mixed with the mixer 9.
Mix in 3. Then, the mixer 93 quantitatively supplies the mixed paint to the coating gun 92 via the hose 98, and the coating gun 92 sprays the paint.

[0004]

However, the above-mentioned conventional two-component mixed coating apparatus has the following problems. That is, the coating gun 92 is provided with the main agent and the curing agent in the mixer 9.
3, the mixed paint is supplied. for that reason,
When the paint after mixing is hardened by being left in the hose 98 and the paint gun 92 which are the passage of the paint when the paint is stopped or the like, the hose 98 and the paint gun 92 become unusable. . In this case, many of these parts need to be replaced or complicated repairs are required, and there is a problem that damage is large. In particular, when a coating machine having a bell cup (see FIG. 2) is used as the above-mentioned coating machine, the amount of damage increases.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a two-part mixed coating apparatus which has a simple structure and does not harden the paint in a paint passage of a coating machine.

[0006]

The invention according to claim 1 comprises an inner tube,
An outer tube coaxially disposed on the outer periphery thereof, a rotatable shaft coaxially disposed on the outer periphery of the outer tube, and a bell cup provided at a tip of the shaft in front of the inner tube and the outer tube. And a coating machine comprising a lid provided at the tip of the bell cup, a main agent tank connected to the inner tube via a main agent pipe, and a hardener tank connected to the outer tube via a hardener pipe. And a curing agent supplied from the main agent tank to the main agent passage in the inner tube and a curing agent supplied from the curing agent tank to the curing agent passage between the inner tube and the outer tube. Is a two-part mixing coating apparatus characterized in that it is configured to be mixed in a bell cup rotating at a high speed and sprayed from the bell cup.

[0007] Most notably, in the present invention, the main agent and the curing agent are not mixed before being supplied to the coating machine, but are mixed for the first time in the bell cup. That is, it is configured to be sprayed.

Next, the operation of the present invention will be described. In the present invention, the coating machine has the inner tube and the outer tube, and the main agent passage and the hardener passage are separately formed. Further, the tip of the inner tube is disposed in the bell cup. Therefore, the main agent discharged from the outlet of the main agent passage and the hardener discharged from the outlet of the hardener passage are mixed for the first time in the bell cup rotating at high speed. And the paint after mixing is
It is immediately sprayed from between the bell cup and the lid.

Therefore, the paint after the mixing does not harden in the inner tube and the outer tube of the coating machine, nor does the coating harden in the coating machine. Further, the structure of the coating machine is simple.

As the above-mentioned main agent, for example, polyester resin, epoxy resin, acrylic polyol resin and the like can be used. Examples of the curing agent (isocyanate) include tolylene diisocyanate (TDI),
Metaphenylene diisocyanate (MDI), hexamethylene diisocyanate (HMDI) and the like can be used.

Next, as in the second aspect of the present invention, the main agent pipe has a main agent flow control device for controlling the flow rate of the main agent, and the curing agent pipe has a hardening agent for controlling the flow rate of the curing agent. It is preferable that the agent flow control devices are respectively provided. In this case, the main agent and the curing agent can be reliably and quantitatively supplied to the coating machine at an arbitrary ratio.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment A two-component mixed coating apparatus according to an embodiment of the present invention is described below.
This will be described with reference to FIGS. As shown in FIGS. 1 to 3, the two-part mixed coating apparatus 1 of the present embodiment has an inner pipe 21, an outer pipe 22 disposed coaxially on the outer periphery thereof, and a coaxially disposed outer periphery of the outer pipe 22. The rotatable shaft 23 and the inner tube 2
1 and a bell cup 24 provided at the tip 231 of the shaft 23 in front of the outer tube 22;
4, a coating machine 2 including a lid 25 provided at the tip of the coating machine. In addition, the two-component mixed coating apparatus 1 includes a main agent pipe 41.
And a hardener tank 5 connected to the outer tube 22 via a hardener pipe 51.

The main agent 40 is supplied from the main agent tank 4 to the main agent passage 210 in the inner tube 21, and the hardener tank 5 is supplied to the hardener passage 220 between the inner tube 21 and the outer tube 22. The hardener 50 is mixed in the bell cup 24 rotating at high speed, and the bell cup 24 is rotated.
It is configured to be sprayed more.

The details will be described below. As shown in FIG. 2, the coating machine 2 is provided with a bell cup 24 at a tip 231 of a cylindrical shaft 23 rotated by an air motor or the like. The bell cup 24 rotated at a high speed has a bell shape whose diameter gradually increases from a base end connected to the tip 231 to a tip. Further, a lid 25 is provided at the tip of the bell cup 24.

The lid 25 has a substantially conical shape, and its apex is arranged coaxially with the bell cup 24 with its vertex facing the inside of the bell cup 24, and the outer peripheral edge is fixed to the inner periphery of the tip of the bell cup 24. A plurality of gaps 250 are provided in a fixed portion between the bell cup 24 and the lid 25, and the main agent 40 and the curing agent 50 are sprayed from the gaps 250.

As shown in FIG. 3, the coating machine 2 has an inner pipe 21 and an outer pipe 2 having a concentric double structure inside the shaft 23.
2 is arranged coaxially with the shaft 23. As shown in FIG. 2, the inner pipe 21 and the outer pipe 22 have their tips 211 and 22 respectively.
2 are opened toward bell cups 24 as spraying means.

As shown in FIG. 1, the rear ends of the inner pipe 21 and the outer pipe 22 are connected to a main agent pipe 41 and a hardener pipe 51, respectively. The main agent pipe 41 is provided in communication with the main agent passage 210 in the inner tube 21 and is also provided in communication with the main agent tank 4 containing the main agent 40. The hardening agent pipe 51 is provided in communication with a hardening agent passage 220 between the inner pipe 21 and the outer pipe 22, and is provided in communication with the hardening agent tank 5 containing the hardening agent 50.

The main agent pipe 41 is provided with a main agent flow control device 64 for controlling the flow rate of the main agent 40,
1 is provided with a hardener flow controller 65 for controlling the flow rate of the hardener 50. In addition, the above coating machine 2
Is provided with a high voltage generator (not shown) for applying a charge to the paint in order to perform electrostatic coating. The main agent 4
Reference numeral 0 denotes a polyester resin, and a curing agent 50 for curing the main agent 40 is an isocyanate.

When the coating is performed, the main agent flow control device 64 receives a signal from the controller 6 inside the bell cup 24 which rotates at a high speed by an air motor or the like, and receives the signal from the controller 6.
0 is set to a predetermined flow rate and supplied from the main agent passage 210. Similarly, the hardener flow controller 65 receives the signal from the controller 6 and sets the hardener 50 to a predetermined flow rate and supplies the hardener 50 from the hardener passage 220.

Then, as shown in FIG.
Inside 4, the rotation causes the main agent 40 and the curing agent 50 to be mixed to form a paint. This paint is immediately sprayed to the outside through the gap 250. As a result, the paint is applied to the surface of the object to be coated, forming a coating film (not shown). Thereafter, baking or the like is performed to obtain a painted product.

The operation of this embodiment will be described below. In this example, the coating machine 2 has an inner tube 21 and an outer tube 22, and the main agent passage 210 and the hardener passage 220 are separately formed. The tip 211 of the inner tube 21 is disposed in the bell cup 24. Therefore, the main agent 40 discharged from the outlet of the main agent passage 210 and the hardener 50 discharged from the outlet of the hardener passage 220 are mixed for the first time in the bell cup 24 rotating at high speed. And the paint after mixing is the bell cup 24
The liquid is immediately sprayed from the gap 250 between the cover 25 and the cover 25.

Therefore, the paint after the mixing is applied to the inner pipe 2 of the coating machine 2.
1, there is no hardening in the outer tube 22 and no hardening of the paint in the coating machine 2. Further, the structures of the coating machine 2 and the two-component mixed coating apparatus 1 are also simple.

The main material pipe 41 is provided with a main material flow control device 64, and the hardener pipe 51 is provided with a hardener flow control device 6.
5 are interposed. Therefore, the main agent 40 and the curing agent 50 can be reliably and quantitatively supplied to the coating machine 2 at an arbitrary ratio.

[0024]

As described above, according to the present invention, it is possible to provide a two-component mixed coating apparatus which has a simple structure and does not harden the paint in the paint passage of the coating machine.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a two-component mixed coating apparatus in an embodiment.

FIG. 2 is an explanatory sectional view of a coating machine in the embodiment.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is an explanatory view of a two-component mixed coating apparatus in a conventional example.

[Explanation of symbols]

 1. . . 1. Two-component mixed coating equipment, . . Coating machine, 21. . . Inner tube, 210. . . Main agent passage, 22. . . Outer tube, 220. . . Hardener passage, 23. . . Shaft, 24. . . Bell cup, 25. . . Lid, 4. . . Main agent tank, 41. . . Main agent pipe, 5. . . Hardener tank, 51. . . 5. hardener pipe, . . Controller, 64. . . Main agent flow control device, 65. . . Hardener flow controller,

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) B05C 11/10 B05C 11/10 F term (Reference) 4D075 AA08 AA71 DB02 DC12 EA27 4F033 QA01 QB03X QB16X QB17 QB18 QD02 QD11 QE09 QF11X QK02 QK03X QK09X QK16X QK17X QK23X QK27X 4F034 AA04 BA23 BB04 4F042 CA01 CB19 CB27

Claims (2)

[Claims] 1. An inner tube, an outer tube coaxially disposed on the outer periphery thereof, a rotatable shaft coaxially disposed on the outer periphery of the outer tube, and a front of the inner tube and the outer tube. A coating machine comprising a bell cup provided at the tip of the shaft, a lid provided at the tip of the bell cup, a base tank connected to the inner tube via a base pipe, and a hardener pipe via the hardener pipe In a two-part mixed coating apparatus having a hardener tank connected to an outer tube, a main agent supplied from the main agent tank to a main agent passage in the inner tube, and a hardener between the inner tube and the outer tube from the hardener tank. A two-pack coating apparatus characterized in that the curing agent supplied to the curing agent passage is mixed in a bell cup rotating at a high speed and sprayed from the bell cup. 2. The main agent pipe according to claim 1, wherein the main agent pipe has a main agent flow control device for controlling the flow rate of the main agent, and the hardener pipe has a hardener flow controller for controlling the flow amount of the hardener. , A two-component mixed coating device, each of which is interposed.