JP2005313042A - Mixing stirring discharging apparatus for liquid agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixing stirring discharging apparatus for liquid agents capable of discharging a first and a second liquid agent from an outlet in a sufficiently mixed and atomized state. <P>SOLUTION: The apparatus 10 is for mixing and stirring a first and a second liquid agent, those being different from each other, and discharging the agents in an atomized state toward the part to be supplied with and comprises an inlet 20 for the first agent, an inlet 22 for the second agent, a discharging tube 12 for discharging the mixture agents in an atomized state from a discharging outlet 19 arranged at the tip part, a static mixer 26 for preliminary mixing and stirring of the first and second agents and an air-blowing-off outlet 44 blowing off air toward the outlet tube 12 at a position downstream to the mixer 26. The preliminarily mixing liquid agents from the mixer 26 is mixed and stirred further with blowing off of air and discharged from the discharging outlet 19 in an atomized state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mixing and discharging device for a liquid agent, and is particularly suitable for application to a device that mixes and stirs a first liquid agent and a second liquid agent that are a reaction liquid agent of foamed polyurethane together with air and discharges them in an atomized state from a discharge port. The present invention relates to an apparatus for mixing and discharging liquid agents.

Conventionally, polyurethane foam has been used as a material for stabilizing natural ground, rock mass consolidation, cavity filling, etc. in tunnel construction.
For this purpose, as a mixing and discharging device for the liquid agent, the first liquid agent and the second liquid agent are mixed in a liquid state by a static mixer (stationary mixer), sent to the discharge pipe, and the liquid mixture is discharged from the discharge port of the discharge pipe to the outside. What was discharged in the state was used.

On the other hand, as a mixing stirring and discharging device for such a liquid agent, the first liquid agent and the second liquid agent are mixed by jetting air and discharged from the discharge port of the discharge pipe to the application target portion (supplied part) in an atomized state. Devices have also been proposed.
For example, Patent Document 1 listed below discloses a mixing stirring and discharging device for this type of liquid agent.
FIG. 6 shows a specific example.
In the figure, reference numeral 200 denotes a discharge pipe, and 202 denotes a discharge port at the tip.
204 and 206 are a first liquid agent inlet and a second liquid agent inlet, 208 is an air pipe, 210 is an air inlet, and 212 is an air jet.
Reference numeral 214 denotes an introduction passage formed around the air ejection port 212.

In this liquid mixture agitating and discharging apparatus, the first liquid agent and the second liquid agent that have flowed in from the inflow ports 204 and 206, respectively, are subjected to the action of the suction force generated by the ejection of air from the air outlet 212, and are introduced into the introduction passage 214. Through the discharge pipe 200, atomized, and mixed and agitated in the process of being pumped through the discharge pipe 200 by the action of the air blown from the air outlet 212, and then atomized from the discharge outlet 202. Is discharged to the outside.
The liquid mixture mixing agitation / discharge device of FIG. 6 can be suitably used, for example, for spraying polyurethane foam for preventing collapse of a wall in a tunnel.

  By the way, in the case of the liquid mixture stirring and discharging apparatus shown in FIG. 6, when a foamed polyurethane mixed liquid agent (mixed reaction liquid agent) is applied to the surface to be coated in a plane, or between the discharge port 202 and the surface to be coated. If a sufficient distance can be ensured, the liquid agent can be applied in a mixed state, but it is difficult to ensure a sufficient distance between the discharge port 202 and the application target location or object, and the liquid mixture is faced. In the case where a predetermined filling space is filled instead of being applied in a shape, it may be difficult to supply the first liquid and the second liquid in a sufficiently mixed state.

For example, using this liquid mixture stirring and discharging apparatus, it has been studied to fill the foamed polyurethane mixed liquid between the wire brushes of the tail seal at the rear of the shield machine used in the tunnel shield method.
However, when the present inventor conducted a filling test of the foamed polyurethane mixed liquid between the wire brushes of the tail seal using this liquid mixed stirring and discharging apparatus, the mixing of the first liquid and the second liquid remains insufficient. The mixed liquid agent is filled between the wire brushes, and as a result, uneven foaming occurs and physical properties such as expansion of the foam (foamed polyurethane) are insufficient. Therefore, the liquid mixture mixing stirring and discharging apparatus shown in FIG. Then, it turned out that this is not suitable for the filling of the foaming polyurethane mixed liquid agent between wire brushes.

In the tunnel shield method using a shield machine, a concrete or steel arc-shaped segment is assembled into a circular shape in parallel with the excavation of the tunnel with a rotary blade at the front end, and the tunnel is resisted against earth and water pressures of the ground. The tunnel inner wall that secures the inner space is constructed.
Here, a slight clearance (gap) for assembling the segment is secured between the tail portion and the segment of the shield machine, and the groundwater pressure is always acting on the clearance portion.

Therefore, the shield machine is provided with a tail seal for sealing the clearance between the tail portion and the segment.
The tail seal is provided in an annular shape in the circumferential direction in a form in which wire brushes are bundled, and grease having high viscosity is filled between the wire brushes to exert a water stop effect.
However, in the case of grease, the grease will flow out little by little while constructing a long distance of many kilometers.
Therefore, it is necessary to replenish the grease, but since the viscosity of the grease is high, there is a problem that it is difficult to fill the grease between the wire brushes.

  On the other hand, filling polyurethane foam as a water-stopping material between wire brushes can exert a good water-stopping effect, and the polyurethane foam has excellent elasticity due to internal bubbles. There is an advantage that it can be elastically deformed following the size of the clearance well, and the size of the clearance can be absorbed well by the deformation.

Thus, when the liquid mixture mixing stirring and discharging apparatus shown in FIG. 6 is used for filling the foamed polyurethane mixed liquid agent between the wire brushes, the first liquid agent and the second liquid agent are filled without being well mixed. As a result, it has been found that there are problems such as uneven foaming, insufficient physical properties such as elongation of the polyurethane foam, resulting in unstable quality, and poor durability.
The following points can be considered as the reason.

When applying a foamed polyurethane mixture to a specific surface to be applied in an atomized state, the atomized mixture discharged from the discharge port reaches the application surface while spreading widely and is applied there. Is done.
Then, it is considered that the mixed liquid agent is sufficiently uniformly dispersed in the diffusion process until reaching the application surface and is applied to the application surface in a good mixed state.

On the other hand, when filling the foam polyurethane mixed liquid agent between the wire brushes of the tail seal in the shield machine, filling is performed from a close distance (if the distance is long, the mixed liquid agent is widely dispersed in other parts than the wire brush. This is considered to be the reason why the liquid mixture is filled between the wire brushes in a non-uniform mixed state.
Therefore, when filling a liquid mixture of foamed polyurethane between the wire brushes of such a tail seal, it is required that the liquid mixture is in a sufficiently mixed state when discharged from the discharge port.
In other words, the liquid mixture agitating and discharging apparatus used for such a purpose is required to be in a sufficiently mixed state when the liquid mixture is discharged from the discharge port.

As mentioned above, the problem of filling the polyurethane foam mixed liquid agent between the wire brushes was described, but when discharging the polyurethane foam mixed liquid agent for other purposes, the mixed liquid agent is discharged at the time of discharge from the discharge port. It is desirable that there is sufficient mixing.
The situation is not limited to the case where the foamed polyurethane liquid mixture is mixed, and different types of liquid agents are mixed and sprayed or filled on the application target site or target object (supplied portion).

JP 2002-282670 A

  The present invention is based on the above circumstances, and an object thereof is to provide a liquid mixture agitating and discharging device capable of discharging a first liquid and a second liquid in an atomized state from a discharge port in a sufficiently mixed state. It was made as.

  Thus, according to the first aspect of the present invention, mixed and agitated discharge of a liquid agent in which different types of first liquid agent and second liquid agent are mixed and agitated, and then the mixed liquid agent is ejected in an atomized state toward the supplied portion. (B) an inlet port for the second liquid agent, and (c) a mixed liquid agent of the first liquid agent and the second liquid agent from the discharge port at the tip. (D) a static mixer that premixes and stirs the first liquid and the second liquid flowing in from the inlet of the first liquid and the inlet of the second liquid, E) an air outlet for discharging the air flowing in from the air inlet toward the discharge pipe at the downstream portion of the static mixer, and the premixed liquid agent from the static mixer is supplied from the air outlet. After further mixing and stirring by blowing out air, No interleaf liquid to discharge in atomized state, characterized in that are.

  According to a second aspect of the present invention, in the first aspect, the preliminary mixed liquid agent is introduced to the discharge pipe side by causing a suction force to act on the preliminary mixed liquid agent from the static mixer by ejecting air from the air outlet. An introduction passage is formed around the air outlet in a state where the discharge portion of the preliminary mixed liquid agent at the end of the static mixer and the discharge pipe communicate with each other.

  According to a third aspect of the present invention, in any one of the first and second aspects, the first liquid agent and the second liquid agent react with each other to form a foamed polyurethane.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the liquid mixture mixing agitation / discharge device is used for filling polyurethane foam between the wire brushes of the tail seal in the shield machine.

Effects and effects of the invention

  As described above, the liquid mixture mixing agitation / discharge device of the present invention first premixes the first liquid agent and the second liquid agent with a static mixer, and the premixed liquid agent is supplied from an air outlet provided in the downstream portion thereof. The mixed liquid agent is discharged in an atomized state from the discharge port of the discharge pipe after further mixing and stirring by jetting of the liquid. According to the liquid mixture mixing and stirring discharge device of the present invention, the first liquid agent and After sufficiently mixing and stirring the liquid mixture with the second liquid agent, that is, in a good mixed state, it can be discharged in an atomized state from the discharge port.

Here, in the liquid mixture mixing agitation discharge device, an introduction passage for introducing the premixed liquid agent to the discharge pipe side by applying a suction force to the premixed liquid agent from the static mixer by the ejection of air from the air jet port, It can be formed around the air outlet in a state where the discharge portion of the premixed liquid agent at the end of the mixer and the discharge pipe are in communication with each other (Claim 2).
In this way, the premixed liquid introduced to the discharge pipe side through the introduction passage can be satisfactorily atomized, and the first liquid and the second liquid in the premixed liquid can be mixed and stirred efficiently. can do.

  Moreover, in the mixing stirring discharge apparatus of the liquid agent of this invention, since the mixing stirring of the 1st liquid agent and the 2nd liquid agent can be performed effectively, the supply amount of these liquid agents and air | gas in order to implement | achieve an optimal mixing state There is also an advantage that the range of condition setting such as the amount of supply is widened.

  The present invention is particularly suitable when applied to an apparatus for discharging a mixed liquid agent of polyurethane foam (Claim 3). In this case, the mixed liquid agent discharged from the discharge port is in a sufficiently mixed state. In the supply section), the foaming reaction is good and uniform and does not cause foaming unevenness, and physical properties such as elongation of the produced foam (foamed polyurethane) are also good, and a foam with stable quality can be obtained.

The present invention is also particularly suitable for filling polyurethane foam between the wire brushes of the tail seal in a shield machine, as can be seen from the above description (Claim 4).
In this case, the foamed polyurethane foam-reacted between the wire brushes has a uniform foamed state and good physical properties such as elongation. Will also be good.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is the liquid mixture mixing stirring discharge device of this embodiment, and 12 is the discharge pipe.
The discharge pipe 12 has a large diameter portion 14 on the proximal end side and a small diameter nozzle portion 16 on the distal end side. Each of the large diameter portion 14 and the nozzle portion 16 is composed of an axial straight tube.
The large-diameter portion 14 and the nozzle portion 16 are separate from each other and are connected to each other by a connecting tool 18 having a tapered shape.
The connector 18 has female threaded portions at both axial ends, and these female threaded portions are screwed to the large-diameter portion 14 and the male threaded portions of the nozzle portion 16, respectively.

The nozzle portion 16 includes a discharge port (nozzle port) 19 at the tip thereof.
Here, the front end surface of the discharge port 19 is an inclined inclined surface.
However, as shown in FIG. 1B, the front end surface may be a shaft face (surface perpendicular to the shaft direction).

Reference numerals 20 and 22 denote an inlet of the first liquid agent and an inlet of the second liquid agent, respectively. The first liquid agent and the second liquid agent flowing in from the inlets 20 and 22 are sent to the static mixer 26 via the junction 24.
The static mixer 26 has a cylindrical body 28 and a stationary stirring blade 30 inside thereof, and the first liquid agent and the second liquid agent that are sent through the merging portion 24 are transferred to the stirring blade 30. The mixture is preliminarily mixed by a stirring action, and the premixed liquid is sent out to the front end side, that is, downward in the figure.

In this embodiment, the agitating blade 30 has a single blade 30A provided in the right half or the left half in a front view and a V-shaped double blade provided in the opposite half, that is, the left half or the right half. The blades 30 </ b> B are attached and held on the ring-shaped attachment seat 34 via the central shaft body 32.
In the static mixer 26, in the process in which the first liquid agent and the second liquid agent that have been sent flow downward in the figure, they are mixed (preliminarily mixed) with each other by the action of the single blade 30A and the double blade 30B, In the premixed state, the cylinder 28 is circulated to the distal end side (lower end side in the figure).

Reference numeral 36 denotes a joint for connecting the static mixer 26 and the discharge pipe 12 in a T-shaped cross state, and a pipe body 38 is screwed coaxially with the discharge pipe 12 to the joint 36, and inside thereof, An air pipe (air nozzle) 40 having a straight shape is provided.
The left end of the tube body 38 in the drawing is an air inlet 42, and the tip of the air tube 40 (the right end in the drawing) is an air outlet 44.

Around this air jet port 44, an introduction passage 46 is formed to communicate the premixed liquid discharge portion 35 of the static mixer 26 with the discharge pipe 12.
The introduction passage 46 is formed in an annular shape by overlapping portions of the air pipe 40 and the discharge pipe 12 in the direction perpendicular to the axis of the large diameter portion 14.
In the case of the liquid mixture agitating and discharging apparatus 10 of this embodiment, it has been confirmed that stirring is better performed when the introduction passage 46 is longer in the axial direction.

In the liquid mixture mixing and discharging apparatus 10, the first liquid and the second liquid are respectively introduced from the inlets 20 and 22, and sent to the static mixer 26 through the junction 24.
The static mixer 26 preliminarily mixes the first liquid and the second liquid that have been sent by the action of the stirring blade 30 and then discharges the liquid from the discharge unit 35 downward in the figure.

On the other hand, from the air outlet 44 at the tip of the air pipe 40 provided in the downstream portion of the static mixer 26, the air that has flowed in through the air inlet 42 is ejected vigorously toward the discharge pipe 12.
The suction force generated by the blown air is applied to the premixed liquid from the static mixer 26 through the introduction passage 46, whereby the premixed liquid is supplied with the supply pressure to the first liquid agent and the second liquid agent and the action of the suction force. Thus, the gas is introduced into the discharge pipe 12 side through the introduction passage 46, more specifically, into the large-diameter portion 14 on the base end side.

The introduced premixed liquid agent is atomized by the air jetted from the air jet port 44, and is mixed and stirred by the jet air in the atomized state. Pumped to the right in the figure.
Then, the liquid mixture is discharged from the discharge port 19 at the tip of the nozzle portion 16 in the atomized state forward, that is, rightward in the drawing.

1 is an example in which the discharge pipe 12 and the static mixer 26 are connected to each other at approximately 90 ° and configured in a T shape as a whole, but is illustrated in FIG. As described above, the static mixer 26 and the discharge pipe 12 can be connected in parallel.
Specifically, in the liquid mixture mixing and discharging apparatus 10 shown in FIG. 2, the static mixer 26 and the discharge pipe 12 are connected to each other with the joint tool 36 and the elbow-shaped joint tool 48 oriented substantially in parallel. Has been.
The other points are basically the same as those shown in FIG.

  According to the mixing and discharging apparatus 10 for liquid agent of the present embodiment as described above, the first liquid agent and the second liquid agent are first premixed by the static mixer 26, and the premixed liquid agent is ejected from the air outlet 44. In order to discharge the mixed liquid agent in an atomized state from the discharge port 19 of the discharge pipe 12 after further mixing and stirring with air, the mixed liquid agent of the first liquid agent and the second liquid agent is sufficiently mixed and stirred, that is, good. It is possible to discharge in an atomized state from the discharge port 19 in a mixed state.

  The liquid mixture agitating and discharging apparatus 10 of the present embodiment is particularly suitable as an apparatus for mixing and stirring the first liquid agent and the second liquid agent, which are reaction liquid agents of foamed polyurethane, and discharging them in an atomized state. Since the mixed liquid discharged from the discharge port 19 is in a sufficiently mixed state, the foaming reaction is good and uniform at the spraying location, and foaming unevenness does not occur, and physical properties such as elongation of the generated foam are also good. Thus, a foam with stable quality can be obtained.

  Incidentally, the polyol as the first liquid agent, which is the reaction liquid agent of the polyurethane foam, is supplied from either one of the inlets 20 and 22, and the isocyanate as the second liquid agent is supplied from the other at a flow rate of 2.0 kg / min as a whole. On the other hand, an experiment was conducted in which compressed air was supplied at an air flow rate of 100 L / min and 300 L / min, ejected from the air ejection port 44, and two types of liquid agents were mixed and ejected from the ejection port 19. The foamed polyurethane produced has a uniform foaming reaction, and the elongation of the foam is 242% on average with respect to the elongation of 179% obtained by manual injection (when the air flow rate is 100 L / min), 217 % (In the case of an air flow rate of 300 L / min), all were good with respect to the elongation of 179% obtained by manual injection.

Further, the closed cell ratio (closed cell ratio) of the foam was higher than the desirable value of 35%, and a higher closed cell ratio was obtained.
Specifically, when the air flow rate is 100 L / min, the closed cell rate is 35.4%, and when the air flow rate is 300 L / min, the closed cell rate is 40.1%, both of which are 35% or more. A high bubble rate was obtained.
Also, in terms of appearance, in the case of the discharge of the foamed polyurethane mixed liquid agent using the liquid mixture mixing and stirring discharge device 10 of the present embodiment, all of the generated polyurethane foam was uniformly foamed without foaming unevenness. .

As described above, since the liquid mixture mixing agitation discharge device 10 of the present embodiment can effectively perform the mixture agitation of the first liquid agent and the second liquid agent, the condition setting such as the supply amount of the liquid agent and the supply amount of air is set. The advantage of widening the range is also obtained.
Incidentally, Table 1 uses the conventional mixed stirring and discharging apparatus shown in FIG. 6 to show the quality of the foamed state, elongation and other physical properties when various conditions such as the liquid supply amount and the air supply amount are changed. It is shown in comparison with the case, and it can be seen from Table 1 that conditions such as the supply amount of the liquid agent and the supply amount of air can be set in a wide range by using the liquid mixture stirring and discharging apparatus 10 of the present embodiment.

Next, FIG. 3 to FIG. 5 show an example in which the liquid mixture mixing agitation / discharge device 10 of this embodiment is applied as a device for filling foamed polyurethane between the wire brushes of the tail seal of the shield machine.
In FIG. 3, 50 is the ground around the tunnel, 52 is a shield machine, 54 is a rotary blade at the tip, 56 is a cylindrical and steel outer plate in the shield machine 52, and 57 is the soil of the ground 50 around the tunnel. This is an arc-shaped concrete (or steel) segment that constitutes the inner wall to secure the tunnel inner space against pressure and water pressure.

A clearance C for assembling the segment 57 is formed between the outer plate 56 and the segment 57. Since the ground water pressure always acts on the clearance C, the shield machine 52 In this case, as shown in FIG. 5, a tail seal is formed by bundling a wire brush 60 (see FIG. 4) in a ring shape in the circumferential direction to seal the clearance C at the rear tail portion 58. 62 is provided.
Between the wire brushes 60 of these tail seals 62, polyurethane foam 64 is filled as a water-stopping material.
Here, the polyurethane foam 64 has a certain level or more of closed cells (closed cells).

FIG. 4 shows a state in which the foamed polyurethane 64 is filled between the wire brushes 60 in the tail seal 62, more specifically, the gap between them using the liquid mixture stirring and discharging device 10 shown in FIG. 1, more specifically, the first liquid agent (reaction liquid agent) It shows a state in which a liquid mixture of a polyol) and a second liquid agent (isocyanate) is filled.
As shown in the drawing, here, the mixed liquid agent of polyurethane foam is discharged between the wire brushes 60 of the tail seal 62 from a close distance, and the mixed liquid agent is injected into the gap.
Then, this is subjected to a foaming reaction, and the foamed polyurethane 64 is filled into the tail seal 62.

  In this case, the liquid mixture agitating and discharging apparatus 10 of the present embodiment is in a state in which the first liquid agent and the second liquid agent are sufficiently mixed when discharged from the discharge port 19, and therefore the wire brush 60 of the tail seal 62. When the mixed liquid agent undergoes a foaming reaction, the mixed liquid agent foams uniformly without causing foaming unevenness, and a foamed polyurethane 64 is obtained in which bubbles are uniformly distributed over the entire surface.

In this embodiment, the foamed polyurethane 64 foam-reacted between the wire brushes 60 has a uniform foamed state and good physical properties such as elongation. Therefore, when this is used as a water-stopping material, the water-stopping function is good. Its durability is also good.
In FIG. 5, 65 is grease.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied to a liquid mixture mixing and discharging device for various purposes other than filling polyurethane foam into the tail seal of the shield machine. In addition, the present invention can be configured in various forms without departing from the gist of the present invention, such as being capable of being applied as a mixed stirring and discharging device for various liquid agents other than polyurethane foam.

It is a figure which shows the mixing stirring discharge apparatus of the liquid agent which is one Embodiment of this invention. It is a figure which shows other embodiment of this invention. It is the figure which showed the shield construction method of the tunnel using a shield machine. It is a figure which shows the example which applied the mixing stirring discharge apparatus of the liquid agent of FIG. 1 for the filling of the polyurethane foam to the tail seal of a shield machine. It is an enlarged view of the V section of FIG. It is a figure which shows the conventional mixing stirring discharge apparatus of a liquid agent.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mixing stirring discharge apparatus of liquid agent 12 Discharge pipe | tube 19 Discharge port 20 Inflow port of 1st liquid agent 22 Inlet port of 2nd liquid agent 26 Static mixer 35 Discharge part 42 Air inflow port 44 Air jet port 46 Introduction passage 52 Shield machine 60 Wire brush 62 Tail seal 64 Polyurethane foam

Claims (4)

A mixing stirring and discharging device for a liquid agent that discharges the mixed liquid agent in an atomized state toward a supply portion after mixing and stirring different types of the first liquid agent and the second liquid agent,
(B) The mixed liquid of the first liquid and the second liquid is discharged in an atomized state from the inlet of the first liquid, (b) the inlet of the second liquid, and (c) the discharge port at the tip. A discharge pipe, (d) a static mixer that premixes and stirs the first liquid and the second liquid flowing in from the inlet of the first liquid and the second liquid, and (e) air flowing in from the air inlet. And an air outlet that is jetted toward the discharge pipe at a downstream portion of the static mixer, and the premixed liquid agent from the static mixer is further mixed and stirred by blowing air from the air outlet. The liquid mixture mixing agitation / discharge apparatus is characterized in that the liquid mixture is discharged from the discharge port in an atomized state.   2. The introduction passage according to claim 1, wherein an introduction passage that introduces the premixed liquid agent to the discharge pipe side by causing a suction force to act on the premixed liquid agent from the static mixer by ejecting air from the air ejection port includes the static mixer. An apparatus for mixing and agitating and discharging a liquid agent, characterized in that it is formed around the air ejection port in a state where the discharge portion of the preliminary mixed liquid agent at the end of the air-liquid discharge port and the discharge pipe communicate with each other.   3. The liquid mixture agitating and discharging apparatus according to claim 1, wherein the first liquid agent and the second liquid agent are reaction liquid agents that react with each other to produce foamed polyurethane.   4. The liquid mixture agitating and discharging apparatus according to claim 3, wherein the liquid agent mixing agitating and discharging apparatus is used for filling polyurethane foam between wire brushes of a tail seal in a shield machine.

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