JPH06198152A - Method for mixing gas in fluidic material - Google Patents

Abstract

PURPOSE:To provide a method for effectively mixing gas, such as air by feeding compressed gas into piston pumps at the suction stage of the piston pumps and forcibly sending a fluidic material and the compressed gas in pressure chambers at the discharge stage. CONSTITUTION:Piton pumps 13, 14 discharge a liquid resin material from material tanks 11, 12 while measuring it. When a motor 15 and a threaded shaft are turned, pistons 13, 14 are reciprocated, causing the liquid resin material and compressed air to be sucked or discharged at a flow rate according to their movement speed. At the suction stage of the piston pumps 13, 14, when a position sensor PS 2 for detecting the upper end of the stroke is on, the pressurization of the material tanks 11, 12 are stopped to feed the compressed gas that has overcome the internal pressure of the pressure chambers 13c, 14c into the pressure chambers. Therefore, the position of the position sensor and the position of a dog for operating it are adjusted, allowing the sucked quantity and the rate of mixing of the liquid resin material and compressed air at the suction stage to be accurately and easily adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mixing various gases such as air into a fluid material such as a two-liquid mixed type liquid resin raw material.

[0002]

2. Description of the Related Art When molding a gasket foam from a high-viscosity liquid resin material, a method of incorporating air as air bubbles has been conventionally adopted for the purpose of making a foam structure dense and improving physical properties such as elastic force. There is.

Conventionally, as a method for mixing air bubbles, air is compressed and blown into a liquid raw material.

[0004]

However, in the conventional mixing method, even if the compressed air is simply blown, it is affected by the pressure of the raw material. It was not clear whether or not the air was blown into the chamber, and it was difficult to control the total amount of compressed air to be blown, and thus the mixing ratio, to be constant.

In view of the above problems, it is an object of the present invention to provide a method capable of efficiently mixing a gas such as air into a fluid material and easily controlling the mixing ratio. .

[0006]

In order to solve the above-mentioned problems, the method according to the invention of claim 1 sucks the fluid material into the pressure chamber by the reciprocating movement of the piston, and the fluid material from the pressure chamber. Using a piston pump that discharges
A method for mixing gas into a fluid material discharged by the piston pump, wherein the compressed gas is fed into the pressure chamber by supplying compressed gas to the piston pump during a suction process of the piston pump. Inhale,
In the discharge process of the piston pump, the fluid material and the compressed gas in the pressure chamber are pressure-fed.

In the method according to the second aspect of the present invention, a plurality of piston pumps are used, and the fluid material and the compressed gas respectively discharged from the plurality of piston pumps are fed to one mixing chamber, and the mixing chamber is provided in the mixing chamber. Mix several types of flowable materials and compressed gas.

In the method according to the invention of claim 3, the volume of the mixing chamber is continuously discharged from the mixing chamber to the outside 1
Set sufficiently high for the amount of batch mixture. In the method according to the invention of claim 4, the fluid material stored in the material tank connected to the piston pump is pressurized in the fluid material suction step, and compressed in the compressed gas suction step. Releases the pressure.

[0009]

The fluid material or compressed gas is selectively sucked into the pressure chamber by controlling the pressure of the fluid material or gas supplied to the pressure chamber during the suction process of the piston pump.

In the discharge process of the piston pump, the fluid material and the compressed gas in the pressure chamber are pressure-fed and stored in, for example, the mixing chamber. In the mixing chamber, a plurality of fluid materials and compressed air are mixed and discharged from a nozzle or the like.

[0011]

FIG. 1 is a diagram showing a system of a mixing system 1 according to the present invention, and FIG. 2 is a timing chart showing the operation of the mixing system 1.

The mixing system 1 comprises two material tanks 1
1, 12 and 2 piston pumps 13 and 14, motor 15 for reciprocating piston pumps 13 and 14, check valves 16 to 19, mixer 20, stirring motor 21, check valves 22 and 23, discharge valve 24 , Nozzle 25, switching valve 26, air pressure source 31, filter 32, pressure adjusting valve 3
3, 33, switching valves 34 to 37, and the like.

The material tanks 11 and 12 are closed type pressure tanks for storing different liquid resin raw materials, and material cartridges are attached to the material tanks 11 and 12, respectively, and inner lids of the material cartridges are attached. Is pressurized downward by the air pressure from the pipe a. This assists the material supply to the piston pumps 13 and 14,
Prevents measurement errors due to viscosity.

The respective liquid resin raw materials are for forming a gasket foam by mixing them with each other and mixing air bubbles. The piston pumps 13 and 14 are pumps for measuring and discharging the liquid resin raw material fed from the material tanks 11 and 12, respectively.
The screw shaft 15a is rotated by the rotation of the motor 15, and the nut screwed to the screw shaft 15a reciprocates, whereby the piston (plunger) reciprocates. The stroke position of the piston is detected by the position sensors PS1 to PS3. That is, the position sensor PS2 detects the upper end, the position sensor PS3 detects the lower end, and the position sensor PS1 detects the intermediate position.

When the piston reciprocates, the liquid resin raw material and the compressed air are sucked or discharged at a flow rate corresponding to the moving speed. That is, when the piston moves in the upward direction of the drawing (direction of arrow M1), the liquid resin raw material is passed through the check valves 16 and 18, or the compressed air is passed through the check valves 17 and 19, and the pressure chambers 13c and 14c, respectively. Inhale to. When the piston moves downward, pressure chamber 13
The liquid resin raw material and compressed air in c and 14c are discharged into the mixing chamber 20a of the mixer 20 through the check valves 22 and 23.

In the suction process of the piston pumps 13 and 14, the liquid resin raw material is sucked up to about three quarters of its stroke, but the switching valves 34 and 35 are switched when the position sensor PS2 is turned on. Material tank 1
While the pressurization by air pressure to 1 and 12 is stopped,
Compressed air is supplied to the check valves 17 and 19.
As a result, in the remaining stroke of about 1/4 in the suction process, the compressed air is sucked into the pressure chambers 13c, 14c by overcoming the cracking pressure of the check valves 17, 19 and the internal pressure in the pressure chambers 13c, 14c. .

Therefore, by adjusting the positions of the position sensors PS1 to PS3 and the position of the dog that operates the position sensors PS1 to PS3, it is possible to easily adjust the intake amounts of the liquid resin raw material and the compressed air in the intake process, and to adjust the compressed air. The mixing rate can be accurately and easily set and adjusted.

The liquid resin raw material and compressed air sucked into the pressure chambers 13c and 14c are mixed by the mixer 20. In the mixer 20, the liquid resin raw material and the compressed air in the mixing chamber 20a are agitated by the blades rotated by the motor 21, and the heat generated by the agitation is cooled by the cooling device provided on the outer circumference. . The volume of the mixing chamber 20a is set to be sufficiently large, which is about 2 to 4 times as large as the amount of one batch of the mixture continuously discharged from the mixing chamber 20a. The raw materials are mixed and the compressed air is mixed and dispersed in a precise manner.

The mixture mixed by the mixer 20 is
When the discharge valve 24 is turned on during the discharge process of the piston pumps 13 and 14, it discharges from the nozzle 25 and is applied to the surface of the workpiece W that moves relatively to form a dense gasket (foam).

The motor 21 is an air motor whose rotation is controlled by the switching valve 37. The discharge valve 24 is switched and controlled by a switching valve 36. Switching valve 26
The liquid resin discharged from one piston pump 13 is switched by switching the switching valve 26 when it is a problem to keep a mixture of two kinds of liquid resin raw materials in the mixing chamber 20a for a long time. The material is returned to the original material tank 11 without being fed to the mixing chamber 20a.
0a is filled with only the other liquid resin raw material so that the reaction of the two-liquid mixed type liquid resin raw material is stopped.

As described above, according to the mixing system 1, it is possible to efficiently mix air into the liquid resin raw material and to accurately and easily control the mixing ratio. FIG. 3 is a diagram showing a system of a mixing system 2 according to another embodiment of the present invention, and FIG. 4 is a timing chart showing the operation of the mixing system 2. In these figures, parts having the same functions as those of the elements shown in FIG. 1 are designated by the same reference numerals to simplify or omit the description. Note that, in FIG. 3, a circuit for supplying compressed air is not shown.

In the mixing system 2, two sets of piston pumps 13a, 14a and 13b, 14b are provided, which alternately perform the suction process and the discharge process, and the liquid resin raw material and thus the mixture are discharged from the nozzle 25. It is continuously discharged. Further, in place of the check valves 16 and 18, switching valves MV1 to MV capable of performing on / off control are provided. Further, the switching valve 35 is doubled, and one of the solenoids (35a or 35a) not shown is
When b) is turned on, compressed air is supplied to the pipe e or f, and the compressed air is mixed through the check valves 17b, 19b or 17a, 19a.

Also in this mixing system 2, it is possible to efficiently mix air into the liquid resin raw material, control the mixing ratio accurately and easily, and further, continuously discharge the mixture.

According to the embodiment described above, the piston pump 1
Since the compressed air is sucked during the remaining constant stroke from the middle of the suction process of 3 and 14, the suction amount of the compressed air is constant, and the mixing ratio can be set accurately. Moreover, the mixing rate can be easily adjusted by adjusting the positions of the position sensors PS1 to PS3 and the dog.

When inhaling compressed air, the material tank 1
Since the pressures in 1 and 12 are released, the suction amount of the compressed air can be made accurate without sucking the liquid resin raw material.

Since the volume of the mixing chamber 20a is sufficiently large with respect to the discharge amount for one time, the mixture can be sufficiently stayed in the mixing chamber 20a and agitated, and the mixing and dispersion of air becomes dense.

In the above embodiment, the position sensor PS1
3 and the types of dogs, the number of dogs, the types of switching valves or motors, and the configurations of the mixing systems 1 and 2 can be variously changed in accordance with the gist of the present invention.

[0028]

According to the present invention, it is possible to efficiently mix a gas such as air into a fluid material and easily control the mixing ratio.

According to the third aspect of the invention, the mixture can be sufficiently kept in the mixing chamber and agitated, and the gas can be mixed and dispersed densely. According to the invention of claim 4, the intake amount of the compressed air can be easily made accurate.

[Brief description of drawings]

FIG. 1 is a diagram showing a system of a mixing system according to the present invention.

FIG. 2 is a timing chart showing the operation of the mixing system of FIG.

FIG. 3 is a diagram showing a system of a mixing system according to another embodiment of the present invention.

4 is a timing chart showing the operation of the mixing system of FIG.

[Explanation of symbols]

 1, 2 Mixing system 11, 12 Material tank 13, 14 Piston pump 13c, 14c Pressure chamber 20a Mixing chamber

Claims (4)

[Claims] 1. A piston pump that sucks a fluid material into a pressure chamber and discharges the fluid material from the pressure chamber by reciprocating movement of a piston is used, and a gas is supplied to the fluid material discharged by the piston pump. A method for mixing, in the middle of the suction step of the piston pump, the compressed gas is fed to the piston pump to suck the compressed gas into the pressure chamber, and in the discharge step of the piston pump, the pressure A method for mixing gas into a fluid material, which comprises pumping the fluid material and a compressed gas in a room. 2. A method for mixing gas into a fluid material according to claim 1, wherein a plurality of the piston pumps are used, and the fluid material and the compressed gas respectively discharged from the plurality of piston pumps are provided in one mixing chamber. And mixing a plurality of types of fluid material and compressed gas in the mixing chamber to mix the gas with the fluid material. 3. The method for mixing a gas into a fluid material according to claim 2, wherein the volume of the mixing chamber is sufficient for the amount of one batch of the mixture continuously discharged from the mixing chamber to the outside. A method of mixing a gas into a fluid material, which is characterized by being set to a large value. 4. The method for mixing gas into the fluid material according to claim 1, wherein the fluid material stored in a material tank connected to the piston pump is: A method of mixing gas into a fluid material, which comprises pressurizing the fluid material in the inhaling step and releasing the pressure in the compressed gas inhaling step.