JP2000024583A - Three-liquid mixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the adjustment of a mixing ratio of three liquids by alternately supplying first and second liquids to a mixer by predetermined amts. and preparing the second liquid from a third liquid supplied from a metering pump and a fourth liquid supplied by the residual amt. calculated by subtracting the supply amt. of the third liquid from that of the second liquid. SOLUTION: One of on-off valves 2-4 for main agents of a, manifold 1 is opened to supply one of A-C liquids to the manifold 1 and, when the flow rate measured by a flowmeter 7 reaches a set value, the opened on-off valve for the main agent is closed to open an on-off valve 5 for a diluting curing agent. Whereupon, one of constant vol. pumps 18-20 of first - third curing agents is started and one of on-off valves 31-33 of diluting thinners is opened and both liquids are mixed by a static mixer 37 and, when the flow rate weighed by a flowmeter 11 reaches a predetermined value, the on-off valve 5 is closed and one; of on-off valves 2-4 is opened to supply the main agent to a premixer 10 and three liquids are mixed by the repetition of this operation to be ejected from a spray gun 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction curing type two-pack coating apparatus, for example, in which three liquids are mixed in predetermined amounts, such as when a curing agent is diluted with thinner and then mixed with a main agent. About the method.

[0002]

2. Description of the Related Art Conventionally, in order to mix three liquids by a predetermined amount,
Either three backward-acting plunger pumps of a predetermined diameter are driven by one air motor to supply a predetermined amount, or three single-acting plunger pumps adjusted to a predetermined stroke are separately driven. And then mixed.

[0003]

However, when changing the mixing ratio of the three liquids, it is necessary to replace some plunger pumps with different diameters in the former prior art, and to change the mixing ratio in the latter. In this technique, it was necessary to change the stroke of some plunger pumps, and all of them required a long time, which hindered the improvement of work efficiency.

[0004]

Means for Solving the Problems, Functions and Effects As means for solving such problems, the invention of claim 1 is directed to a method in which the first liquid and the second liquid have a predetermined fixed ratio. The second liquid is supplied alternately by a predetermined amount to the first mixer and mixed, and the second liquid is supplied preferentially from a metering pump that discharges a predetermined constant amount and the supply amount of the third liquid From the supply amount of the second liquid, the first liquid and the second liquid are supplied.
If the opening and closing valves are opened and closed by setting the flow rate each time, and if the discharge amount of the third liquid is set, the mixing ratio of the three liquids is automatically determined and the setup change time is shortened. The invention of claim 2 is the invention according to claim 1,
The discharge pressure of the metering pump that discharges the third liquid is higher than the discharge pressure of the pump that discharges the fourth liquid. Is automatically discharged, and there is an effect that one flow meter is not required and the manufacturing cost of the apparatus is reduced. Since the fourth liquid is mixed, the third liquid is effectively mixed when the second liquid is mixed with the first liquid.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a three-component coating method will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a first manifold,
On-off valves 2, 3 and 4 for liquids A, B and C, which are main agents (first liquid of the present invention), and a hardener (third liquid of the present invention) as a diluent (fourth liquid of the present invention) ) Is connected to the on-off valve 5 of the diluted hardener (second liquid of the present invention) and the on-off valve 6 of the cleaning thinner, and the on-off valves 2, 3, 4, and 6 are connected to the first flow meter 7 and the first
The open / close valve 5 is connected to the premixer 10 via the second flow meter 11 and the second check valve 13, and the main agent and the curing agent are connected to the premixer 10 via the check valve 9. Roughly mixed with static mixer 1
4, the mixture is sufficiently supplied, supplied to the spray gun 16 via the on-off valve 15, and injected.

[0006] Here, the main agent and the diluent curing agent are the first and the second.
The flow rate is measured by the flow meters 7 and 11, and each time the flow rate reaches a preset flow rate, one of the on-off valves 2, 3, and 4 and the on-off valve 5 are alternately opened and closed. Is maintained.

Next, a supply device for the diluent hardener will be described. In FIG. 1, reference numeral 17 denotes a second manifold, which supplies a first hardener, a second hardener, and a third hardener. Three constant volume pumps 18, 19, 20 for supply
Further, an opening / closing valve 21 of the cleaning thinner is attached.

As shown in FIG. 2, the constant displacement pumps 18, 19 and 20 reciprocate a piston 25 by pressurized air supplied alternately from pressurized air supply / discharge holes 23 and 24 formed in a cylinder 22. Plunger 2
6 is a single-acting type plunger pump in which the hardening agent sucked from the inlet 27 by the reciprocating motion of 6 is discharged from the outlet 28. The adjustment is performed by adjusting the stroke of the piston 25 according to.

Reference numeral 30 denotes a third manifold, which is a first manifold.
The open / close valves 31, 32, and 33 of the dilution thinner, the second dilution thinner, and the third dilution thinner are attached, and check valves 34, 35 are provided between the second manifold 17 and the third manifold 30. The premixer 36 and the static mixer 37 are connected via the, and the static mixer 36 is connected to the on-off valve 5 of the dilution hardener.

Here, the supply pressure of the first, second and third dilution thinners is controlled by the constant volume pumps 18 and 1 for supplying the curing agent.
9 and 20 are lower than the discharge pressure.

Next, the operation of the embodiment will be described. A selected one of the main agent on-off valves 2, 3, and 4 of the first manifold 1 is opened to supply one of the liquids A, B, and C to the first manifold 1, and the first flowmeter When the flow rate measured in step 7 reaches a preset value, the open / close valve for the main agent, which has been opened, closes, and the open / close valve 5 for the second dilution hardener opens.

Then, first, second, and third constant volume pumps 18, 19, and 20 for pumping the first, second, and third hardeners are provided.
Is activated, and the selected one of the first, second and third dilution thinner on-off valves 31, 32 and 33 is opened. Since the discharge pressures of the constant volume pumps 18, 19, and 20 for supplying the agent are high, the check valve 34 is closed even when the check valve 35 is opened, and one selected constant volume pump 18, 1
A constant amount determined by the strokes of 9, 20 is supplied,
Thereafter, the check valve 34 is opened and the selected diluted thinner is supplied to the pre-mixer 36, the two liquids are sufficiently mixed by the static mixer 37, and the second flow meter 1 is passed through the on-off valve 5.
When the flow rate reaches 1 and the flow rate reaches a predetermined value, the on-off valve 5 closes, and instead, one of the on-off valves 2, 3, and 4 opens to supply the main agent to the premixer 10. The three liquids are mixed and ejected from the spray gun 16.

Before switching between the main agent, the curing agent, and the dilution thinner, the on-off valves 6, 21 are opened, and the path is cleaned with the cleaning thinner.

The present invention can be used for mixing adhesives and the like in addition to mixing paints.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an apparatus used in an embodiment of the present invention.

FIG. 2 is a sectional view of the constant displacement pump.

[Explanation of symbols]

 7: First flow meter 8: First open / close valve 11: Second flow meter 12: Second open / close valve 16: Spray gun 18, 19, 20: Constant displacement pump

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shinsuke Toki 5050 Nitta-dong, Asahimae-cho, Owariasahi-shi, Aichi Prefecture F-term in Asahi Sana Tsuk Co., Ltd. 4D075 AC06 AC84 AC95 BB16X BB93X EA23 EB45 EC37 4G037 AA02 BA01 BB01 BC02 BD01

Claims (3)

[Claims] 1. A first liquid and a second liquid are alternately supplied to a first mixer by a predetermined amount so as to have a predetermined constant ratio and mixed therein, and the second liquid is a predetermined constant liquid. A three-liquid mixing method comprising a third liquid supplied preferentially from a metering pump for discharging an amount and a fourth liquid supplied only by the remaining amount obtained by subtracting the supply amount of the third liquid from the supply amount of the second liquid. . 2. The three-liquid mixing method according to claim 1, wherein the discharge pressure of the metering pump that discharges the third liquid is higher than the discharge pressure of the pump that discharges the fourth liquid. 3. The method for mixing three liquids according to claim 1, wherein the third liquid and the fourth liquid are mixed.