JPS6316067A - Apparatus for applying reaction curable paint - Google Patents

Abstract

PURPOSE:To enhance the quantitative accuracy of a positive displacement pump by a simple structure, in supplying a main agent and a curing agent to a mixer separately by positive displacement pumps, by arranging an atmospheric open type auxiliary tank to the upstream area of the pump on the side of the main agent. CONSTITUTION:A main agent 3 and a curing agent 7 preliminarily prepared with solvents and stored in main tanks 2, 6 are respectively transported through recirculation pipelines 5, 10 separately by pumps to be carried to the vicinity of a painting booth 12 and taken over to take-out pipelines 11, 12 arranged in the proper number of rows from said position to be supplied to mixers 19, 23 and a painting machine 25 by positive displacement pumps 18, 22 respectively adjusted quantitatively. At this time, the main agent 3 is guided to the upstream pipeline 11a of the take-out pipeline 11 to be stored in an atmosphere open type main agent auxiliary tank 14 and, therefore, pressure variation based on the emitting pulsation of the pumps generated in the recirculation pipelines 5, 10 or pressure variation generated between the take-out pipelines 11, 20 can be adsorbed and settled.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coating device for a two-component reaction-curing paint, and more specifically, to an improvement of the coating device with the aim of increasing the precision of the mixing ratio of the main agent and the curing agent. Regarding.

[Prior art] In general, two-component reaction-curing paints have a better appearance than one-component paints, and they are also capable of room temperature reaction curing, which does not require curing energy when curing and drying the paint film. It has advantages. However, since this reaction-curing paint has a pot life, it is difficult to mix or mix it and then transport it to the booth via pipes. The problem is that they must be transported by supply system, mixed and sprayed before application. Another problem is that the mixing ratio of the base resin and curing agent must be controlled with high precision depending on the type of base resin, the type of pigment contained in the base resin, and the like.

As a technical means to try to solve the above problem, for example, Japanese Patent Publication No.
The invention disclosed in Japanese Patent No. 59-21346 is known.

The present invention is characterized by detecting the supply amounts supplied from the main agent supply system and the curing agent supply system, comparing the mixing ratio of the main agent and curing agent with a preset mixing ratio, and The supply amount of the agent is controlled to a preset mixing ratio.

[Problems to be Solved by the Invention] However, the invention requires a control device consisting of a hard circuit, a microcomputer, etc., a mixing ratio setting device that automatically sets the mixing ratio of the base resin and the curing agent to a desired ratio,
In addition to requiring complex equipment such as rotation detectors and input/output signal lines, when the main agent and curing agent are led from each supply system to multiple mixing devices and coating machines via branch systems, Accompanied by pressure fluctuations, quantitative accuracy is impaired, and in some cases, this may have an unfavorable effect on the physical properties of the coating film.

The technical problem to be solved by the present invention is to improve the quantitative accuracy of the main agent and curing agent, or at least the main agent, with an extremely simple structure, and to be able to control their mixing ratio at a high level.

[Means for Solving the Problems] In order to solve the above-mentioned technical problems, the present invention provides a circulation system pipe that individually circulates the base agent and curing agent that have been prepared and stored in each main tank, and each circulation system pipe. a take-out system pipe connecting a part of the channel and the Si mixing device via positive displacement pumps each having a predetermined flow rate, a coating machine connected to the mixing device via a hose, and the take-out system pipe related to at least the base agent. A structure including an open type sub-tank disposed upstream of the positive displacement pump in the passageway is adopted.

One form of the take-out system conduit related to the above-mentioned base agent includes a sub-circulation system conduit that bypasses the mixing device and returns to the sub-tank at an appropriate time.

C action] The main agent and curing agent, which have been mixed with a solvent in advance and stored in each main tank, are pumped through separate circulation system pipes and transported to the vicinity of the coating booth, and from this position one or more After being taken over by a series of take-out pipes, it is supplied to each mixing device and coating machine by a positive displacement pump whose supply amount is adjusted, but due to the discharge pulsation of the pump that occurs in the circulation pipe The pressure fluctuations that occur between each extraction system pipe line due to the double-row system according to the required number of extractions are absorbed and suppressed by the interposition of an open sub-tank, so the volume of the extraction system pipe line is reduced. The above-mentioned pressure fluctuation has no effect on the discharge action of the mold pump, and the quantitative accuracy is significantly improved, so that the mixing ratio of the base resin and curing agent can be controlled at a high level.

[Example] Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows a first embodiment of the present invention, and in the figure, 1 is a paint mixing room that is generally installed at a certain distance from a painting booth, which will be described later. A first main agent main tank 2 for storing the main agent 3 is disposed, and the main agent 3 is pumped by a reciprocating pump 4 such as an air-driven plunger pump, which does not require consideration of radiation protection and can easily control a desired pressure.
so that it circulates inside the first circulation system pipe 5,
The turning point of the first circulation system pipe rR5 extends to the vicinity of the painting booth. Reference numeral 6 denotes a curing agent main tank for storing, for example, isocyanate-based curing agent 7, which is distributed in the paint A gassho 1 together with the first main agent 412, and is sealed from contact with air by filling with nitrogen or the like to prevent curing. It is structured as follows. The curing agent 7 is circulated in the second circulation system pipe 10 by a positive displacement pump 9 such as a gear pump driven by an electric motor 8, and is circulated in the second circulation system pipe vB1.
The turning point 0 extends to the vicinity of the painting booth, similar to the first circulation system pipe 5 described above.

Reference numeral 11 denotes a first extraction system pipe for the base agent 3 that is connected to a part of the first circulation system pipe 5 (only one system is illustrated for convenience in the figure), and the end of the upstream pipe 11a is coated. Booth 1
Open-type first base agent #14 disposed within the bulging portion 13 of No. 2
1-14 is inserted. The first main agent sub-tank 14 is connected to the first circulation system pipe 5 based on the discharge pulsation of the reciprocating pump 4.
In order to absorb and suppress the pressure fluctuations occurring between each first extraction system pipe line 11 due to the pressure fluctuations within the pipes as well as the number of required extraction lines, the same The storage level of the main agent in the main agent sub-tank 14 is controlled by an on-off valve 16 that operates in correspondence with a level meter 15 . I! The first main agent sub-tank 1 is driven by a dynamic motor 17 to adjust its supply amount.
4 is connected to a mixing chamber 19 that constitutes a mixing device together with a static mixer, which will be described later, via a positive displacement pump 18 such as a gear pump.

On the other hand, in the curing agent 7 extraction system pipe line 20 (also only one system is shown) connected to a part of the second circulation system pipe line 10, the curing agent sub-tank ( However, in this embodiment, since the curing agent is an isocyanate-based curing agent, in order to prevent the curing agent from reacting and curing due to contact with the atmosphere, the second circulation system pipe 10
A positive displacement pump 9 with relatively little pressure fluctuation is used inside the
This is shown as an exceptional configuration in which the interposition of the curing agent gJFII is intentionally omitted. Therefore, the take-out line 20 is driven by an electric motor 21 and is directly connected to the mixing chamber 19 via a positive displacement pump 22 such as a gear pump whose supply rate is adjusted to a fixed ratio with the pump 18 for the base agent. . 23 is a static mixer for mixing the main agent 3 and curing agent 7 that have been combined in the mixing chamber 19, and the static mixer 23 is connected to a coating machine 25 such as an air gun or an airless gun via a flexible hose 24. ing. Note that 26 is an object to be coated placed in the coating booth 12, and 27 is a trolley for transporting the object.

The first embodiment of the present invention is constructed as described above, in which the main agent 3 and curing agent 7 of the reaction-curing paint are mixed with a solvent in advance in the paint mixing chamber 1, and the first main agent main side 2 and curing agent 7 are mixed with a solvent in advance in the paint mixing chamber 1. The agent is stored in the main tank 6. When the dedicated pumping means, that is, the reciprocating pump 4 for supplying the base agent and the positive displacement pump 9 for supplying the hardening agent, start operating, the base agent 3 and the hardening agent 7 are transferred to the first and second pumps extending to the vicinity of the coating booth 12. The main agent 3 circulates in the two circulation system pipes 5 and 10, and the main agent 3 is circulated in the upstream pipe 11 of the first extraction system pipe 11 arranged in an appropriate number of rows.
a and is stored in the first main agent sub-tank 14. The storage 11Wffi of the first main agent sub-W114 is maintained at a predetermined level by an on-off valve 16 that operates in accordance with the level meter 15, and pressure fluctuations of the main agent 3 are skillfully absorbed by the tank structure that is open to the atmosphere. Be sedated. A positive displacement pump 18 whose supply volume is adjusted to achieve a predetermined mixing ratio.
22 is activated, the main agent 3 passes through the downstream pipe line 11t of the first take-out system pipe line 11, the curing agent 7 passes through the take-out system pipe line 20, and both liquids meet in the mixing chamber 19, and then the static The mixture mixed by the mixer 23 is sent to the coating machine 2.
5 and is sprayed from the coating 63125 toward the object 26 to be coated.

FIG. 2 shows a second embodiment of the present invention, in which the same parts as in the first embodiment are designated by the same reference numerals and will be explained.

In the paint preparation chamber 1, a second main agent main tank 2' that stores a main agent 30 having a different color from the main agent 3 is juxtaposed. It is configured to circulate within the circulation system pipe 50, and the turning point of the m3 circulation system pipe 50 is tJ! as in the first @circulation system pipe 5. It extends to the vicinity of the mounting booth 12. Reference numeral 110 denotes a second extraction system pipe for the base agent 30 connected to a part of the third circulation system pipe 50, and the upstream pipe 110
The end of a is an open-type second main agent sub-tank 1 which is arranged in parallel with the first main agent sub-tank 14 in the bulging part 13 of the coating booth 12.
40. Downstream pipe line 1 of the second extraction system pipe line 110 connected to the outlet of the second main agent sub-tank 140
10b is a downstream pipe line 11b of the first extraction system pipe line 11;
It is also connected to the mixing chamber 19 via a positive displacement pump 180 formed in tandem. 11
C and 110C are first and second sub-circulation system pipes for preventing sedimentation of the main paint during color change or interruption of painting work, through a color change valve (not shown) attached to the mixing chamber 19, The main agent 3.30 is poured into the first and second main agent sub-tanks 14.
140.

The second embodiment of the present invention described above shows a configuration in which two types of base materials 3.30 with different color tones are selectively used, and each base material 3.30 has a dedicated first and second base materials. The 2nd main agent D1 tank 14.140 absorbs and suppresses fluctuations in power, and the 1st and 2nd auxiliary circulation systems are used to prevent the main agent of unpainted colors or the main agent from settling when the painting operation is interrupted. Since there is no substantial difference in the operation from the first embodiment except for the fact that it is refluxed to the first and second base D" tanks 14 and 140 via the pipes 11c and 110c, a detailed explanation will be omitted.

Note that the positive displacement pump 180 for supplying the base agent is not necessarily limited to a tandem type;
1. An independent pump may be used for each unit. Similarly, if the mixing ratio of the positive displacement pump 22 for supplying the curing agent differs depending on the type of base agent, an independent pump may be provided for each valve means. Switching by 1IIJIl
] may be configured. Further, even in the above-described first embodiment in which a monochrome main paint is used, it is desirable to provide the first sub-circulation system pipe 11C to prevent the main paint from settling during work interruptions. Furthermore, it is also possible to add a configuration in which a color change valve attached to the mixing chamber 19 is communicated with a thinner source, and when a predetermined loft is finished painting, the downstream supply system after the mixing chamber 19 is cleaned by switching the valve υJlil.

[Effects of the Invention] As detailed above, the reaction-curing paint coating apparatus of the present invention transports the main agent and curing agent from the main tank in the paint mixing chamber to the vicinity of the painting booth via each circulation system pipe. Then, when these are transferred to the extraction system pipe and supplied to the mixing device by each positive displacement pump whose supply amount is adjusted, the main agent and curing agent, or at least the upstream region of the positive displacement pump related to the main agent, The 01 tank, which is open to the atmosphere, is arranged to absorb and calm pressure fluctuations that occur between the extraction system piping lines due to the pump discharge pulsation and multiple extractions that occur within the circulation system piping line. With an extremely simple improved structure, the fixed m accuracy of the above-mentioned positive displacement pump can be significantly improved, and the mixing ratio can be managed at a high level.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a first embodiment of the present invention, and FIG. 2 is a system diagram showing a second embodiment. 1...Paint mixing room 2...1st main agent main tank 2'
...Second main agent main tank 3.30...Main agent 4.40...
Reciprocating pump 5...First circulation system pipe line 6...Curing agent main tank 7...
Hardening agent 9...Displacement pump 10...Second
Circulation system pipe 11...First extraction system pipe (main agent) 11c...111th Jli circular system pipe 12...Painting booth 14...First main agent sub-tank 18
．． 22.180...Displacement pump 19...Mixing chamber 20...Takeout system pipe (curing agent) 23...Static mixer 25...Painting machine 50...Third circulation system pipe 1
10...Second extraction system pipe (main agent) 110C...Second sub-circulation system pipe 140...Second main agent sub-tank

Claims (2)

[Claims] (1) Circulating system pipes that individually circulate the main agent and curing agent that have been prepared and stored in each main tank, and a part of each circulating system pipe and the mixing device are connected via positive displacement pumps with predetermined flow rates. a take-out pipe line connected to the mixer, a coating machine connected to the mixing device via a hose, and an open sub-tank disposed upstream of the positive displacement pump in the take-out pipe line for at least the main agent. A coating device for a reaction-curing paint, which includes: (2) The device according to claim 1, wherein the take-out line for the main ingredient constitutes a sub-circulation line that bypasses the mixing device and flows back to the sub-tank in a timely manner.