JP3701181B2 - Multi-component mixed pressure feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for mixing and feeding multiple liquids at a constant ratio, such as a two-liquid coating apparatus that mixes and sprays a curing agent with a main agent.
[0002]
[Prior art]
In the conventional multi-liquid mixing device, liquid is pumped from each tank opened to the atmosphere by a plurality of positive displacement pumps such as a gear pump, and is pumped to a mixer to be mixed. A liquid with a low viscosity such as a curing agent has a large leak in the positive displacement pump of the two-component coating apparatus and cannot send a predetermined amount. Therefore, it can be mixed with the main agent having a high viscosity and a small leak at a desired ratio. It was difficult.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide an apparatus capable of reliably mixing and feeding multiple liquids at a constant ratio.
[0004]
[Means, actions and effects for solving the problems]
As means for solving such problems, a first aspect of the present invention, was added to Rutotomoni, a plurality of liquid feed to the mixer a plurality of liquid allowed to act any pressure in each separate positive displacement pump Since the pressure and the outlet side pressure of the positive displacement pump of the liquid supplied to the mixer are compared, and based on the result, a control valve that shifts or stops the drive air motor of the positive displacement pump is provided, Even if the pressure on the inlet side and the outlet side of the positive displacement pump is substantially the same and the viscosity is low, there is almost no leakage, and multiple liquids can be mixed and fed at a constant ratio.
[0005]
In the invention of claim 2, a plurality of airtight tanks each containing different liquids are connected to a pressurized air supply source via a regulator, and one end is inserted into each airtight tank and the other end is connected to a mixer. Since the separate positive displacement pumps are interposed in the supply pipe, the effect of the invention of claim 1 can be reliably realized.
[0006]
In the invention of claim 3, since all or a part of the airtight tank is a pump, the facility is simplified.
[0008]
According to a fourth aspect of the present invention, the control valve is mounted on the other side of the diaphragm in which the pressure of the liquid supplied to the mixer acts on one side and the secondary side pressure of the regulator acts on the other side. It consists of a valve body, a flow path for air motor driving air formed on the other side of the diaphragm, and a valve port formed in the flow path corresponding to the valve body. Since the diaphragm is operated by the balance of the secondary side pressure, the opening and closing of the valve opening and the substantial opening degree adjustment are performed, so that the effect of the invention of claim 1 can be reliably realized. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 1 denotes a pressurized air supply source, which is connected to a reference pressure supply port 33 of the control valve 3 via a regulator 2, and the regulator 2 includes a main agent airtight tank 11 and a hardener airtightness. It is connected to the tank 21.
[0010]
The pressurized air supply source 1 is also connected to the pressurized air supply port 34 of the control valve 3, and the pressurized air discharge port 35 of the control valve 3 is connected to the air motor 6.
[0011]
The output shaft 61 of the air motor 6 is connected to a main drive shaft 62. The main drive shaft 62 directly drives the main volume positive pump 12 composed of a gear pump, and decelerates the hardener positive displacement pump 22. Driven via the machine 7.
[0012]
From the main agent positive displacement pump 12, the main agent reaches the mixer 4 from the inlet 31 of the control valve 3 through the outlet 32 by the pressure in the main agent airtight tank 11, and hardens from the hardener positive pump 22. The curing agent reaches the mixer 4 directly by the pressure in the agent airtight tank 21, is mixed with the main agent, and is ejected from the nozzle 5.
[0013]
In the present embodiment, since constant pressure air is supplied into the airtight tanks 11 and 21 to pressurize the main agent and the curing agent, the pressures at the inlet and outlet of the positive displacement pumps 12 and 22 are almost the same. In general, since the curing agent having a significantly lower viscosity than the main agent is also supplied to the mixer by the positive displacement pumps 12 and 22 at the same pressure as the main agent, the main agent and the curing agent are mixed at a constant ratio determined by the speed reducer 7 Good painting is done.
[0014]
The control valve 3 is configured as shown in FIGS. 2 and 3, and when the trigger is pulled and the paint is injected, the main agent flows from the inlet 31 to the outlet 32 as shown in FIG. Since the pressure of the passage is lower than the pressure supplied from the reference pressure supply port 33, the valve body 36 is lifted together with the diaphragm 37, the valve port 38 is opened, and the pressurized air discharge port 35 is pressurized from the pressurized air supply port 34. Air flows, the air motor 6 is driven, and the main agent and the curing agent are quantitatively supplied to the mixer 4 by the positive displacement pumps 12 and 22.
[0015]
When the trigger is loosened to reduce the amount of paint sprayed, the flow of the main agent from the inlet 31 to the outlet 32 of the control valve 3 is delayed, and the pressure in the flow path is higher than the pressure supplied from the reference pressure supply port 33. Therefore, the valve element 36 approaches the valve opening 38 together with the diaphragm 37, the pressurized air passage area of the valve opening 38, that is, the substantial opening degree is reduced, and the flow rate of the air supplied to the air motor 6 is reduced. As a result, the rotational speed of the air motor 6 decreases and the discharge amount of the positive displacement pumps 12 and 22 driven by the air motor 6 decreases, and the ratio of the main agent and the curing agent is made constant by the pulling amount of the trigger. The entire discharge amount can be controlled while keeping it.
[0016]
When the injection of the paint is stopped, as shown in FIG. 3, the flow of the main agent from the inlet 31 to the outlet 32 of the control valve 3 is stopped, and the pressure of the flow path is supplied from the reference pressure supply port 33. Therefore, the valve body 36 is pushed down together with the diaphragm 37, the valve port 38 is closed, the flow of pressurized air from the pressurized air supply port 34 to the pressurized air discharge port 35 is stopped, and the air motor 6 Stops and the displacement pumps 12, 22 stop.
[0017]
Therefore, the gear pumps that are the positive displacement pumps 12 and 22 are prevented from rotating idle and worn, and the hose rupture due to an abnormal increase in paint pressure is prevented.
[0018]
FIG. 4 shows another embodiment of the present invention. In this embodiment, the regulator 2 in the above embodiment is dedicated to the control valve 3, and the main agent airtight tank 11 and the hardener airtight tank 21 are Since the pressurized air supply source 1 is connected by the separate regulators 13 and 23, the pressures of the control valve 3, the main agent airtight tank 11 and the curing agent airtight tank 21 can be adjusted individually as necessary.
[0019]
This embodiment is used when the regulator 2, the control valve 3, and the airtight tanks 11 and 12 cannot be connected as in the above embodiment.
[0020]
In each of the above embodiments, a pump such as a diaphragm pump may be used instead of the airtight tanks 11 and 21.
[0021]
The present invention can be applied not only to the coating as in each of the above embodiments, but also to other multi-component mixed pressure feeding operations such as application of an adhesive.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a safety valve with a valve port open.
FIG. 3 is a cross-sectional view of the safety valve with the valve port closed.
FIG. 4 is an explanatory diagram of another embodiment of the present invention.
[Explanation of symbols]
1: Pressurized air source 2, 13, 23: Regulator 3: Control valve 4: Mixer 5: Nozzle 6: Air motor 7: Reducer 11, 21: Airtight tank 12, 22: Positive displacement pump

Claims (4)

A separate positive displacement pump provided in each supply pipe for sending a plurality of liquids under an arbitrary pressure to the mixer ;
The pressure applied to the plurality of liquids is compared with the outlet pressure of the positive displacement pump of the liquid supplied to the mixer, and the air motor for driving the positive displacement pump is changed based on the result. A control valve to stop,
A multi-component mixed pressure feeding device characterized by comprising: Wherein the plurality of liquid is contained in a respective different plurality of airtight tank connected through a regulator to a pressurized air supply source, the special volume pump is inserted one end to the respective airtight tank and the other end The multi-liquid mixed pressure feeding device according to claim 1, wherein the multi-liquid mixing pressure feeding device is interposed in each supply pipe connected to the mixer.   The multi-liquid mixed pressure feeding device according to claim 2, wherein all or part of the airtight tank is a pump. The pressure of the liquid supplied to the mixer acts on one side of the control valve,
A diaphragm on which the secondary side pressure of the regulator or another regulator acts on the other side;
A valve body attached to the other side of the diaphragm;
Similarly, the air motor driving air flow path formed on the other side of the diaphragm,
A valve port formed in the flow path corresponding to the valve body;
The valve is opened and closed and the opening degree is substantially adjusted by operating the diaphragm according to the balance between the pressure of the liquid and the secondary pressure of the regulator. The multi-liquid mixed pressure feeding device according to claim 1 .

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