JPH1015443A - Mixed liquid jetting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to perform fine adjustment for jetting a mixed liquid by hand by regulating a retreating position of a plunger and forming an adjusting screw for adjusting jetting in such a size capable of performing fine adjustment by hand, when different pressurized liquids from two places crossing with a axial direction of a cylinder are fed and mixed by a retreating movement of the plunger to be jetted. SOLUTION: Compressed air is fed into an air cylinder 7 by pressing an operation button, and a piston 8 is pushed backwards together with the plunger 4, and then a rear end surface of the plunger 4 hits on the tip surface of the adjusting screw 21 and the retreating is regulated and also liquid inlets 5, 6 are made to communicate with the inside of a cylinder room 2a, and two pressurized liquids come into collision to be mixed and are jetted from a jetting port 3. Since the jetting of this mixed liquid is regulated by the position of the plunger 4 retreating into the cylinder room 2a, a protrusion quantity of the adjusting screw 21 is preliminarily adjusted and then a nylon friction plug 14 is screwed in and screwing tightness of the adjusting screw 21 is adjusted. A knob 21a of this adjusting screw 21 is made large, and thus the jetting can easily be performed to attain fine adjustment by hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed liquid injection device, which is suitable for use in, for example, injection of polyurethane foam.

[0002]

2. Description of the Related Art Polyurethane foam molding is one of the cases where two different liquids must be mixed and sprayed at the same time. Mixing and spraying a polyurethane resin component and an active substance containing isocyanate is performed. .

As shown in FIG. 3, for example, a mixed liquid injection device used for molding such a polyurethane foam is configured as an injection gun 1 and provided with an injection head 2 forming a cylinder at a tip end thereof. A jet port 3 is formed at the tip of the head 2 and a slidable plunger 4 is attached to the inner peripheral portion. Further, liquid inlets 5 and 6 are formed on both sides of the jet head 2. The two liquid inlets 5 and 6 can communicate with the inside of the ejection head 2 or can be in a sealed state.

An air cylinder 7 is provided coaxially with the plunger 4 at an intermediate portion of the injection gun 1, and a male screw is formed at an intermediate portion of the plunger 4 penetrating the piston 8 of the air cylinder 7, and an adjusting nut is provided. A compression coil spring 10 is interposed between the adjusting nut 9 and the rear part of the air cylinder 7 to press the plunger 4 forward.

Therefore, the position of the plunger 4 pushed by the compression coil spring 10 can be adjusted by the position of the adjusting nut 9.

Further, in front of the piston 8 of the air cylinder 7, compressed air can be supplied / discharged through a valve 12 provided with an operation button 11, and the compressed air is supplied to the piston 8 so that the piston 8 is compressed. The plunger 4 can be moved backward with the piston 8 integrally with the piston 8 so that the two liquids pressurized through the liquid inlets 5 and 6 are supplied and mixed into the ejection head 2. The injection can be performed from the injection port 3.

In the state of FIG. 3B in which the injection gun 1 does not perform the injection, the tip of the plunger 4 is adjusted to protrude from the tip of the injection head 2 by about 0.8 mm, so that the remaining after the injection is obtained. It is necessary to be able to completely extrude the liquid, and the leading end position of the plunger 4 is adjusted with the adjusting nut 9.

On the other hand, the injection of the mixed liquid mixed and injected from the injection port 3 at the tip of the injection head 2 varies depending on the retreat position of the injection head 2 at the tip of the plunger 4, as shown in FIG. Therefore, an adjustment screw 13 is provided at the rear of the air cylinder 7 of the injection gun 1 to regulate the retreat position of the plunger 4, and the adjustment screw 13 is regulated by hitting the rear end of the plunger 4.

The adjustment screw 13 has a nylon frink plug 14 screwed in from the side of the injection gun 1 so that the tightness of the adjustment screw 13 can be adjusted.

Therefore, when the operating button 11 is pressed to open the valve 12 to supply compressed air into the air cylinder 7 and push the piston 8 back together with the plunger 4 against the compression coil spring 10, the rear end face of the plunger 4 Hits the tip surface of the adjusting screw 13 and further retreat is regulated, whereby the injection of the mixed liquid is adjusted.

[0011]

However, in the injection gun 1 constituting such a mixed liquid injection device, when the adjustment screw 13 is to be adjusted for adjusting the injection, the screw is tightened with the nylon friction plug 14. After adjusting the stiffness, the head of the adjusting screw 13 is hexagonal and has a small size, so that there is a problem that it is difficult to turn the adjusting screw 13 by hand to readjust it, and it is particularly difficult to make fine adjustments.

On the other hand, even if the tightening hardness of the screw by the nylon friction plug 14 is adjusted to an appropriate hardness, if the injection gun 1 constituting the mixed liquid injection device is continuously used, The tightening tightness of the adjusting screw 13 decreases due to vibration or the like, whereby the adjusting screw 13 moves to change the injection state of the mixed liquid and the spray pattern changes, so that the tightening tightness of the adjusting screw 13 is constantly increased. And the position of the adjusting screw 13 must be readjusted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is a mixing device which can easily be finely adjusted by hand even if the tightening tightness of the adjusting screw is increased so as not to be loosened over time. It is an object to provide a liquid ejecting apparatus.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, a mixed liquid injection device according to the present invention applies different pressurized liquids from two places crossing the axial direction of a cylinder by retreating a plunger. In the mixed liquid ejecting apparatus for supplying and mixing into the cylinder and ejecting from the tip of the cylinder, an adjusting screw for regulating the retreat position of the plunger and adjusting the ejection is formed so as to be finely adjustable by hand and provided. It is a feature.

According to this mixed liquid ejecting apparatus, the adjusting screw for regulating the rear end position of the plunger can be finely adjusted by hand. For example, the head of the adjusting screw is made to have a large circular shape. Thus, even if the tightening hardness of the adjusting screw is increased, the screw can be easily rotated and adjusted by hand.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show an embodiment of a mixed liquid injection device according to the present invention.
FIG. 1A is an overall configuration diagram showing a partially cutaway view, FIG.
2B is an external perspective view of only the adjusting screw, FIG. 2A is a partial cross-sectional view in a state where the mixed liquid is not jetted, and FIG. 2B is a partial cross-sectional view in a state where the mixed liquid is jetted.

This mixed liquid ejecting apparatus includes, for example, an ejection gun 2
0, the main parts are the same as those of the injection gun 1 of FIG. 1 already described, and the same parts are denoted by the same numbers.

In this injection gun 20, the injection head 2 is slidably provided in the injection head 2 constituting a cylinder.
And a plunger 4 for communicating or sealing the two liquid inlets 5 and 6 formed on both sides of the cylinder chamber 2a with the inside of the cylinder chamber 2a.

The plunger 4 is reciprocated while its intermediate portion is guided by a plunger guide 15, and an air cylinder 7 is provided coaxially with the plunger 4 behind the plunger guide 15. A male screw 4 a is formed in the middle of the penetrated plunger 4, and an adjustment nut 9 is screwed in. A compression coil spring 10 is provided between the adjustment nut 9 and the rear part of the air cylinder 7.
Is interposed and pressed by the spring holding screw 16 to press the plunger 4 forward.

Therefore, as shown in FIG. 2A, the piston 8 located at the tip (left end in the figure) of the air cylinder 7
By changing the tightening position of the adjusting nut 9 that comes into contact with the plunger 4, the leading end position of the plunger 4 held by the compression coil spring 10 can be adjusted, and the spring holding screw 16 at the base end of the air cylinder 7 can be tightened. The spring force of the compression coil spring 10 can be adjusted depending on the position.

Further, in front of the piston 8 of the air cylinder 7, compressed air can be supplied / discharged via a valve 12 provided with an operation button 11, and the compressed air is supplied to the piston 8 so that the piston 8 is compressed. The plunger 4 can be moved backward with the piston 8 integrally with the piston 8, and the two liquids pressurized through the liquid inlets 5 and 6 into the cylinder chamber 2 a of the ejection head 2. Can be supplied and mixed and can be ejected from the ejection port 3 at the tip of the ejection head 2.

On the other hand, as shown in FIG. 2 (b), the mixed liquid injected from the injection port 3 at the tip of the injection head 2 is injected into the cylinder chamber 2 of the injection head 2 at the tip of the plunger 4.
a, the adjusting screw 21 is provided in the air cylinder 7 on the center axis of the spring holding screw 16 at the rear end of the air cylinder 7 of the injection gun 20 in order to regulate the retreating position of the plunger 4. The distal end is screwed so as to protrude, and the rearward position of the plunger 4 is restricted by adjusting the adjusting screw 21 so as to regulate the retracted position.

The adjusting screw 21 is formed with a screw hole on the side of the spring retaining ring 16 to prevent the injection gun 20 from being loosened during use or the like. It can be adjusted.

Further, the adjusting screw 21 can be finely adjusted by hand with the nylon friction plug 16 even when the tightness of the mixture is increased by the nylon friction plug 16. Is provided with a disk-shaped knob 21a, and has a diameter of, for example, about 20 mm. An engraved mark 21b is formed on the outer surface of the disk-shaped knob 21a at one location on the radius to facilitate confirmation of the rotational position.

The screw portion of the adjusting screw 21 is
It has a hollow cylindrical shape as before, and a unified screw U
About 1/4 are formed about 20 mountains.

In the injection gun 20 constituting the mixed liquid injection apparatus having the above-described configuration, the liquid inlets 5 and 6 are supplied with an active substance containing, for example, a resin component of polyurethane and an isocyanate which have been pressurized in advance. With valve 1
2 to be able to supply compressed air.

After the preparation for injection of the mixture is completed,
When the operating button 11 is pressed to open the valve 12 to supply compressed air into the air cylinder 7 and push the piston 8 back together with the plunger 4 against the compression coil spring 10, the rear end face of the plunger 4 Along with the tip surface, further retreat is regulated and
The liquid inlets 5, 6 on both sides of the ejection head 2 are in the cylinder chamber 2a.
Two pressurized liquids which are communicated with each other are collided and mixed, and are ejected from the ejection port 3 at the tip.

The injection of this mixture is adjusted by the position of the plunger 4 retracted in the cylinder chamber 2a. Therefore, the protrusion of the adjusting screw 21 is adjusted in advance by checking the injection state, and then the nylon friction plug 14 is adjusted. And tighten the screw tightly.

Even when the adjusting screw 21 is adjusted in advance, the injection state changes during injection by the injection gun 20 and it is necessary to make fine adjustment. In this case, the knob 21a of the adjusting screw 21 is enlarged. Therefore, the screw can be easily turned by hand even in a state where the tightening of the screw is strengthened, and fine adjustment of the injection state can be performed.

Further, since the tightening hardness of the adjusting screw 21 can be increased by the nylon friction plug 14, the movement of the adjusting screw 21 during use of the injection gun can be suppressed, and the change of the spray pattern can be reduced. It can be sprayed in a constant state without any.

In the above-described embodiment, the case of foaming a polyurethane foam with two liquids as a mixed liquid has been described as an example. However, the present invention is not limited to this, and is widely applied to cases where it is necessary to spray simultaneously with other mixing. You can do it.

[0032]

As described above, according to the embodiment of the present invention, the adjusting screw for regulating the rear end position of the plunger can be finely adjusted by hand. For example, even when the adjusting screw is tightened firmly as a large diameter circular head, it can be easily turned by hand to adjust.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a mixed liquid injection device according to the present invention, wherein FIG.
(B) is an external perspective view of only the adjustment screw.

FIG. 2 is a partial cross-sectional view of a mixed liquid ejecting apparatus according to an embodiment of the present invention, in which (a) shows a state in which the mixed liquid is not ejected;
(B) is a partial cross-sectional view of a state in which the mixed liquid is jetted.

FIGS. 3A and 3B are views showing the entire configuration of a conventional injection gun, in which FIG. 3A is a partially cutaway view, FIG. 3B is a cross-sectional view of an injection head in a state where the mixed liquid is not injected, and FIG. It is sectional drawing of the ejection head part of an ejection state.

[Explanation of symbols]

 2 Injection head 2a Cylinder chamber 3 Injection port 4 Plunger 4a Male screw 5 Liquid inlet 6 Liquid inlet 7 Air cylinder 8 Piston 9 Adjusting nut 10 Compression coil spring 11 Operating button 12 Valve 14 Nylon friction plug 15 Plunger guide 16 Spring holding screw 20 Injection gun (Mixed liquid injection device) 21 Adjusting screw 21a Knob 21b Engraved

Claims (1)

[Claims] 1. A mixed liquid ejecting apparatus for supplying and mixing different pressurized liquid into a cylinder by retreating a plunger from two places intersecting with an axial direction of a cylinder and ejecting the mixed liquid from a tip of the cylinder. A mixed liquid ejecting apparatus characterized in that an adjusting screw for regulating ejection and adjusting ejection is formed in a size that can be finely adjusted by hand.