JP2010075855A - Mixing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixing system and method for a spraying material where the mixing of an admixture material is uniformly performed regardless of what the kind of the spraying material is, the pulsation of the spraying material press-feed system can be prevented, a satisfactory finished face can be obtained not depending on the skill of an operator, and the finished face is caked in a short time. <P>SOLUTION: The mixing system comprises: a spraying material press-feed system Lm; an air feed system La; an admixture material feed system Lc; an injection nozzle 10 injecting a mixture of the spraying material, air, and the admixture material; an air addition apparatus 6 where the spraying material press-feed system Lm and the air feed system La are joined; and an admixture material addition apparatus 7 where the admixture material is added to a mixed flow of the spraying material and air. In the air addition apparatus 6, high pressure air forms a rotating flow spirally rotating in the flow passage of the air addition apparatus 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a technique for uniformly spraying a spray material and an admixture and spraying a homogeneous and stable spray material on a slope in a spraying method in which a spray material is sprayed on a slope.

As a technique for spraying a spray material on a slope, a technique is generally used in which the spray material is pressure-fed into a hose by high-pressure air from a mortar gun and sprayed to the slope from a nozzle at the tip of the hose. Here, in the related art, when the pumping distance becomes long, this method may not be adopted in terms of workability and quality.
On the other hand, a “pump combined type” spraying method in which air is blown in the middle of pressure feeding by a concrete pump has been proposed (see Patent Document 1).
In this “pump combined type” spraying method, in order to avoid a decrease in pumping pumpability, admixtures such as quick setting agents and agglomerates are not added in the material mixing process, but in the hose during the pumping or at the nozzle at the tip. It is common to add and mix with the spray material. And the technique which pumps an admixture to a nozzle by a different system | strain from a spray material, and adds and mixes with a nozzle is proposed (refer patent document 2).
However, in order to mix the admixture homogeneously, the nozzle part is long, and the hose weight for the admixture is added, so when blowing the material on the slope, the work is hanging on the slope with a rope etc. The problem is that the load on the person (nozzle man) becomes too large.

As another prior art, the mixing system shown in FIG. 9 includes a material hose Hm that conveys the spray material M with compressed air, and a quick-setting material conveyance hose Hc that conveys the quick-setting material with compressed air. And the spraying material injection nozzle Nm is provided in the front-end | tip of material hose Hm, and the quick setting material conveyance hose Hc is connected to the said spraying material injection nozzle Nm.
During construction of the spraying method, the quick setting material C injected from the nozzle Nc provided at the tip of the quick setting material transport hose Hc is mixed with the spray material M injected from the spray material injection nozzle Nm. Therefore, there is no possibility that the spray material is cured in the hose Hm.
However, the mixing system shown in FIG. 9 has a problem that the quick setting material C is not uniformly mixed with the spray material M.
Moreover, it is difficult for an operator to hold and move two hoses Hm and Hc provided side by side.

  In the mixing system shown in FIG. 10, a tip nozzle Nm is provided at the tip of a material hose Hm that pumps the spray material M with a pump. Then, the pipe Y merges at the position upstream of the tip nozzle Nm by the length L (right side in FIG. 10), and the spray material M in the material hose Hm and the abruptly supplied through the Y-shaped pipe Y. The binding material C is mixed.

In this system, the Y-tube Y is fixed, and the length of the section L from the tip nozzle Nm to the Y-tube Y is adjusted to increase the weight on the upstream side (right side in FIG. 10) from the Y-tube Y. This allows the nozzle man to work without acting on the nozzle man.
However, since the spray material M mixes with the quick setting material C at the junction of the pipe Y and the hose Hm, the mixed material may be cured in the region from the junction to the nozzle Nm (region before the nozzle Nm). There is. In particular, the spray material M may be cured at the junction of the pipe Y and the hose Hm.

When such hardening occurs, the spray material M flowing in the material hose Hm blocks the hose Hm at the cured portion. When such a blockage occurs, the hose Hm must be cut open.
In addition, in the stage before reaching the complete blockage, a region where only the spray material exists in the material hose Hm is intermittently generated, so-called “pulsation” is generated, and unevenness occurs on the spray surface due to this pulsation. End up. In addition, this pulsation sometimes poses a danger to workers who work by holding the hose.
JP-A-9-296453 JP 11-247196 A

  The present invention has been proposed in view of the above-mentioned problems of the prior art, and can uniformly mix the spray material and the additive, can prevent pulsation in the spray material pumping system, and is introduced. The object is to provide a spraying material mixing system and a mixing method that are low in cost and can obtain a safe finished surface safely even if an operator (so-called “nozzle man”) is not a skilled worker.

  The mixing system of the present invention includes, for example, a system for mixing a spray material (M) and an admixture (C) used in a spraying method, a spray material pumping system (Lm) for pumping the spray material (M), and a high pressure An air supply system (La) for supplying air (A), an admixture supply system (Lc) for conveying the admixture (C) by air, a spray material (M), air (A) and an admixture (C) An injection nozzle (10) for injecting a mixture of the above, an air addition device (6) in which a spraying material pumping system (Lm) and an air supply system (La) merge, and a downstream side (injection nozzle) of the air addition device (6) 10) and an admixture addition device (7) for adding the admixture (C) to the mixed flow of the spray material (M) and air (A). In the air addition device (6), the air supply The system (La) is inclined with respect to the spray material pumping system (Lm), and the high pressure A (A) is configured to form a swirl flow (6af) that spirally swirls around the flow path (6f) of the air addition device (6), and the admixture addition device (7) has a flow path (7f). ) Is connected to the admixture supply system (Lc) so that the admixture is injected into the inside (claim 1).

Here, the admixture adding device (7) is preferably configured such that the admixture is injected in a direction perpendicular to the flow path (6f) of the air adding device (6).
The mechanism for injecting the admixture into the flow path (7f) of the admixture addition device (7) is a through hole (72) drilled in the tube wall constituting the flow path (7f) of the admixture addition device (7). ) Is preferred.
Furthermore, it is preferable that the admixture injected in the direction perpendicular to the flow path (6f) of the air addition device (6) is injected in a curtain shape.

  In carrying out the present invention, the air supply system (La) for supplying the high-pressure air (A) and the admixture supply system (Lc) for conveying the admixture (C) to the same high-pressure air supply source (2) are used. It is preferable that they are connected (claim 3).

And the mixing method of this invention uses the mixing system (Claim 1 of Claim 1) mentioned above, for example in the mixing method which mixes the spraying material (M) and admixture (C) which are used by the spraying method, The blowing material (M) fed through the blowing material pumping system (Lm) by the air adding device (6) and the high-pressure air (A) flowing through the air supply system (La) are merged, and the air adding device (6) flows. The step (S2 in FIG. 3) of scraping off the spray material (M) piece by piece with the swirling flow (6af) of the high-pressure air (A) spirally swirling along the path (6f) and the admixture addition device (7) A step of injecting the admixture (C) supplied from the material supply system (Lc) into the flow path (7f) (S3 in FIG. 3), and a small piece of spray material (Mp) scraped by the high-pressure air (A) ) As a small piece of spray material (M Admixtures on the surface of) (C) is characterized in that and a process to be applied (S4 in FIG. 3) (claim 4).
Here, it is preferable that the admixture (C) injected by the admixture addition device (7) is injected in a direction perpendicular to the flow path (6f) of the air addition device (6).

According to the present invention having the above-described configuration, the high-pressure air (A) forms a swirl flow (6af) that spirally swirls in the flow path (6f) of the air addition device (6), and the spraying material pumping system The spray material (M) pumped from (Lm) is scraped off in small pieces from the radially outer side on the downstream side (injection nozzle 10 side).
Then, the spray material (Mp) scraped off by small pieces is conveyed by air to the admixture adding device (7) with high-pressure air (A), and the admixture adding device (7) is supplied from the admixture supply system (Lc). Since the supplied admixture (C) is injected into the flow path (7f) (for example, the direction perpendicular to the flow path: Claim 2), the portion where the admixture (C) is injected is sprayed material. By passing the small piece (Mp), the admixture (C) is applied to the surface of the small piece (Mp) of the sprayed material that has passed.

By applying the admixture (C) to the surface of the small piece (Mp) of the spray material, the small pieces (Mp) of the spray material do not adhere to each other, and the small pieces are prevented from adhering to form a large lump. Is done. And the small piece (Mp) of the spray material with which the admixture (C) was apply | coated to the surface is air-transported to the injection nozzle (10), maintaining the state isolate | separated into many small pieces, and is injected from an injection nozzle (10) Is done.
Therefore, there is no possibility that the spray material (M) will harden in the region from the location where the spray material (M) and the admixture (C) are mixed to the spray nozzle (10). And whatever the distance from the location where the spray material (M) and the admixture (C) are mixed to the injection nozzle (10) is set, the spray material with the admixture (C) applied to the surface The large number of small pieces (Mp) are kept separated from each other and are not separated into large lumps (Md) and air pools in the flow path.
Therefore, generation | occurrence | production of the pulsation of a pipe system containing an injection nozzle (10) can be suppressed.

  Furthermore, since the small piece (Mp) of the spray material passes through the portion where the admixture (C) is injected, the admixture (C) is applied to the entire surface of the small piece (Mp) of the spray material. The amount of the admixture (C) added to the material (M) becomes uniform corresponding to the surface area of the small piece (Mp) of the spray material. And since the admixture (C) is uniformly added to the spray material (M), the consumption of the admixture (C) is reduced.

In addition, after mixing the spray material (M) and the admixture (C) with the admixture addition device (7), the distance to the injection nozzle (10) can be set arbitrarily, so work on the slope. Even if the worker (nozzle man) holding the spray nozzle (10) by hand, the weight of the admixture addition device (7) is not burdened, and the construction site where the worker should carry out the spraying method (for example, the method) The operation of spraying the spray material (M) can be easily performed.
Moreover, since generation | occurrence | production of the pulsation of the pipe system containing the injection nozzle (10) can be suppressed as mentioned above, it will prevent that an operator (nozzle man) grasps the injection nozzle (10) by the said pulsation. No spraying work is facilitated. Therefore, even if it is not a skilled worker, it can finish with high precision.
Furthermore, in the present invention, since the admixture adding device (7) is provided so that the admixture is injected into the flow path (7f), the introduction cost can be extremely low.

Here, in the present invention, in order for the admixture (C) to be injected into the flow path (7f) of the admixture addition apparatus (7), the flow path (7f) of the admixture addition apparatus (7). The pressure of the admixture supply system (Lc) needs to be larger than the internal pressure.
Here, when the high pressure air (A) is supplied by the air addition device (6), the swirl flow (6af) of the high pressure air that spirally swirls the flow path (6f) of the air addition device (6) (M) and a high-pressure air (A) flow passage having an annular cross section surrounded by the inner wall surface (61i) of the pipe (61) and the outer surface (Ms) of the sprayed material (M) being pumped Flow through (6a). The cross-sectional annular flow path (6a) has a cross-sectional area that increases from the region where the high-pressure air is injected toward the downstream side (injection nozzle 10 side), and the speed and pressure of the high-pressure air decrease. .
Therefore, for example, even if the air supply system (La) for supplying high-pressure air and the admixture supply system (Lc) for conveying the admixture (C) by air are connected to the same high-pressure air supply source (2). The admixture (C) can be injected into the flow path (7f) of the admixture adding device (7), for example, in a direction perpendicular to the flow path (7f).

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the mixing system for mixing spray material (for example, mortar, greening base material, soil material, etc.) and admixture (for example, quick setting material, quick hardening material, slump killing material, aggregate material, etc.) Is shown at 100. The system 100 includes a spraying material pumping pump 1, an air compressor 2, and an admixture pumping pump 3.

In addition, the mixing system 100 includes a spray material pumping system Lm, an air supply system La, an admixture supply system Lc, an air distribution device 4, a merging pipe 5 for joining the admixture and air, an air addition device 6, and an admixture addition. The apparatus 7 and the mixed fluid transfer hose Lx are provided. The air addition device 6, the admixture addition device 7, and the mixed fluid transfer hose Lx are connected to one body, and the mixed fluid injection hose Lx is provided at the tip of the mixed fluid transfer hose Lx. Is connected.
In FIG. 1, in the admixture addition device 7, the admixture is spray mixed with the spray material sent from the air addition device 6, and the spray material mixed with the admixture is air-pressurized toward the mixed fluid transport hose Lx. Yes. The admixture adding device 7 includes a merging pipe 73, a taper pipe 74, and an adapter 75.
Here, the merging pipe 73 of the air addition device 6 and the admixture addition device 7 is configured to have a large diameter in order to add high-pressure air to the pumped spray material and further add the admixture. The mixed fluid transfer hose Lx is configured to have a small diameter in consideration of the pumpability of the air mixed fluid and the workability of the nozzleman on the slope. Therefore, in the admixture adding device 7, the taper tube 74 adjusts the difference in diameter between the large diameter portion and the small diameter portion, and is further connected to the mixed fluid transport hose Lx via the adapter 75.

The spraying material pumping system Lm connects the discharge port 1o of the spraying material pumping pump 1 and the suction port 6i of the air addition device 6.
The spray material discharged from the spray material pumping pump 1 is pumped to the air addition device 6 via the spray material pumping system Lm.

The air supply system La is composed of lines La1, La2, La3, La4, La5, an air distribution device 4, and a merging tube 5 of admixture and air.
The air distributor 4 has a suction port 4i connected to the line La1 and four discharge ports. Of the four outlets, the three outlets are connected to lines La2 to La4 via on-off valves V41, V42, and V43. The remaining one discharge port is closed with a plug P.
The mixing tube 5 of the admixture and air has two inlets 51 and 52 and an outlet 53. The inflow port 51 is connected to the line La4 through the on-off valve V51, and the inflow port 52 is connected to the admixture supply system Lc (described later) through the on-off valve V52.

The line La1 connects the air compressor 2 and the suction port 4i of the air distribution device 4.
The line La2 connects the open / close valve V41 at the discharge port of the air distributor 4 and one open / close valve V62 in the air inlet 62 of the air addition device 6 described later.
The line La3 connects the open / close valve V42 at the discharge port of the air distributor 4 and the other open / close valve V62 at the air inlet 62 of the air addition device 6.

The line La4 connects the open / close valve V43 at the discharge port of the air distributor 4 and the open / close valve V51 interposed in the inlet 51 of the merge pipe 5 for the admixture and air.
The line La5 connects the outlet 53 of the joining pipe 5 of the admixture and air and the on-off valve V7 interposed in the admixture inflow part 71 of the admixture addition device 7.

The admixture supply system Lc connects the discharge port 3o of the admixture pressure feed pump 3 and the open / close valve V52 at the inlet 52 of the merge pipe 5 for the admixture and air.
In the junction pipe 5 of the admixture and air, the high-pressure air supplied from the compressor 2 via the air distributor 4 and the admixture supplied from the admixture pump 3 are merged. The admixture is taken along the line La5 by high-pressure air and supplied to the admixture adding device 7.
In FIG. 1, reference sign ES indicates a slope on which the spraying operation is performed, reference sign N indicates an operator (nozzle man) who performs the spraying work, and reference sign Ro indicates a master rope for supporting the worker N on the slope. (Rope) is shown.

The details of the air addition device 6 and the admixture addition device 7 will be described with reference to FIGS.
FIG. 2 shows the air addition device 6 to the mixed fluid conveyance hose Lx in FIG. In FIG. 2, the white arrow M indicates the spray material, the arrow A indicates the high-pressure air supplied, the arrow C indicates the admixture, and more specifically the admixture conveyed by the high-pressure air.

FIG. 3 shows the air addition device 6 and the admixture addition device 7.
4 shows in detail the state in which the tip of the spray material M (the right end in FIGS. 3 and 4) is finely scraped off by the air jet Ja ejected from the air inflow portion 62 in the air addition device 6. ing.
3 and 4, the air addition device 6 includes a large-diameter portion 61 through which the spray material M is pumped and a pair of air inflow portions 62. In each of the pair of air inflow portions 62, an opening / closing valve V 62 is interposed at the end of the inflow side (air supply source side: the side indicated by the arrow A).
The pair of air inflow portions 62 are arranged to be inclined with respect to the large diameter portion 61. The tip of the air inflow portion 62 is not directed toward the central axis of the large diameter portion 61. The front end of the air inflow portion 62 is offset with respect to the central axis of the large diameter portion 61 so that the air jet Ja ejected therefrom flows in a spiral shape along the inner wall surface of the large diameter portion 61. Has been placed. As a result, the air jet Ja ejected from the tip of the air inflow portion 62 becomes a swirling flow 6af that flows in a spiral shape along the inner wall surface of the large diameter portion 61.

In the air addition device 6, the tip side (the right end side in FIGS. 3 and 4) of the spray material M that goes straight as a lump and travels straight through the large-diameter portion 61 is a high-pressure air jet Ja ejected from a pair of air inflow portions 62. And / or by the swirling flow 6af of the high-pressure air swirling in a spiral shape, the strip is scraped and deformed into a generally tapered shape.
The strip Mp of the spray material M scraped off by the high-pressure air jet Ja (sprayed material scraped finely) is dispersed in the form of strips and is taken along by the high-pressure air jet Ja, and the admixture addition device 7 Head for.
3 and 4, reference numeral Ms indicates a portion of the spray material M from which the strips have been scraped off by the high-pressure air jet Ja, which has been scraped off in a tapered shape.
As described above, the state in which the tip (right end) of the spray material M is finely scraped off by the air jet Ja ejected from the air inflow portion 62 in the air addition device 6 is shown in detail in FIG. .

  By the way, as shown in FIG. 3 and FIG. 4, the strips Mp of the spray material scraped off tend to be easily adhered to each other when the air blowing is performed as it is. Therefore, while being transported in the mixed fluid transport hose Lx (see FIGS. 6 and 7), as shown in FIG. 7, the strips Mp of the spray material are bonded (joined) to form a large mass Md. Thus, the flow path in the mixed fluid transfer hose Lx may be intermittently separated into a region where only air is present and a region where only the mass Md of the fine material Mp of the spray material is present (so-called “ "Pulsation" occurs).

  The interior of the flow path in the air addition device 6, the admixture addition device 7, and the mixed fluid transfer hose Lx is intermittently separated into a region where only air is present and a region where only the mass Md of the strip Mp of the spray material is present. In order to prevent the occurrence of blockage or “pulsation” of the flow path, in the illustrated embodiment, the spray material strip Mp scraped by high-pressure air into small pieces and dispersed. By forming a coating of an admixture on the surface, it is possible to suppress adhesion to each other.

FIG. 8 schematically illustrates an apparatus for forming a coating of admixture on the surface of a spray material strip Mp.
In FIG. 8, in the process in which the spray material M is pumped to the injection nozzle 10 by the pumping pump (in the process of pumping from left to right in FIG. 8), the air jet Ja added in the air inflow pipe 62 and The strips MP are formed by the spiral flow 6af (they are cut so as to be strips MP). An admixture spray curtain Jc (shown by a dotted line in FIG. 8) is formed behind the air inflow pipe 62 (to the right in FIG. 8) so as to cover the cross section of the flow path.
As the spray material strip Mp passes through the spray curtain Jc, a coating of admixture is formed over the entire surface of the spray material strip Mp. By forming the coating of the admixture on the entire surface of the spray material strip Mp, adhesion of the spray material Mp dispersed in the small pieces is suppressed, and the air addition device 6, the admixture addition device 7, the mixed fluid Generation of a large mass Md (see FIG. 7) that blocks the flow path in the transfer hose Lx is prevented, and so-called “pulsation” is also prevented.

In FIG. 1, in order to reduce the burden on the nozzle man working on the slope, the air addition device is applied to, for example, the steps of the slope and the bottom of the slope so that the weight of the air addition device 6 and the admixture mixing device 7 is not directly applied to the nozzle man. 6 and the admixture mixing device 7 are installed in a stable state, and are connected from here to the mixed fluid jet nozzle 10 by the mixed fluid transport hose Lx. Here, if the strip Mp of the spray material in the mixed fluid becomes a large lump Md and may block the flow path, the length of the mixed fluid transfer hose Lx cannot be set arbitrarily, and the nozzle man It becomes impossible to reduce the load.
In the present invention, the admixture is coated on the surface of the spray material strip Mp in a dispersed state, and the spray material strip Mp is prevented from adhering to each other to form a large mass Md. Therefore, the flow path is not blocked by the large lump Md, and the length of the mixed fluid transport hose Lx can be arbitrarily set.

FIG. 5 shows details of the admixture adding device 7 schematically shown in FIG. In FIG. 5, a large number of strips Mp of the spray material are comprehensively represented by arrows Mp.
In FIG. 5, an admixture inflow portion 71 is attached to the tube wall of the flow path 7f of the admixture adding device 7 so as to be orthogonal to the flow path 7f. A through hole 72 is formed in the center of the region where the admixture inflow portion 71 is attached on the tube wall of the flow path 7 f, and the admixture is injected into the flow path 7 f through the through hole 72.

In the admixture inflow portion 71, an opening / closing valve V 7 is interposed at the end opposite to the through hole 72. This on-off valve V7 is closed when the mixing system 100 is stopped.
In addition, it is also possible to provide a flow rate adjusting valve (not shown) instead of the on-off valve V7 so that the intake flow rate of the admixture can be adjusted depending on the characteristics of the spray material.

  The admixture C injected with the high-pressure air from the through hole 72 forms a high-pressure jet curtain Jc so as to cover the cross section of the flow path 7f. Then, when the spray material strip Mp passes through the curtain Jc of the high-pressure jet, the admixture C is applied to the entire surface of each of the numerous spray material strips Mp, and a coating layer of the admixture C is formed. The adhesion between the strips Mp of the spray material is suppressed or prevented.

Here, the admixture C is mixed with the high pressure air jet Ja and / or the swirl flow 6af sprayed from the air inflow portion 62 of the air addition device 6 before the admixture C is formed into a large lump Md adhered. When forming the coating layer, the distance from the air inflow portion 62 to the through hole 72 of the admixture inflow portion 71 is limited to within 200 cm.
By the way, in order to inject the admixture C (curtain Jc) into the flow path 7f of the admixture addition apparatus 7, the pressure in the admixture supply system Lc is higher than the pressure in the flow path 7f of the admixture addition apparatus 7. The pressure needs to be high, and for this purpose, an adjustment valve for pressure adjustment or a plurality of air compressors are required.

  In the present invention, in the air addition device 6, the jetted air jet Ja becomes a swirl flow 6 af that spirally swirls the flow path 6 f of the air addition device 6. The swirling flow 6af flows through the annular flow path 6a surrounded by the inner wall surface 61i of the pipe 61 through which the spray material M and the high-pressure air A flow and the outer surface Ms of the spray material M. The annular flow path 6a has the smallest cross-sectional area in the region immediately after the air jet Ja is ejected, and the cross-sectional area increases from there toward the downstream side (the ejection nozzle 10 side). Therefore, the speed of the swirl flow 6af is decelerated as it goes downstream (injection nozzle 10 side), and the pressure also decreases as it goes downstream (injection nozzle 10 side).

Here, in this invention, the through-hole 72 of the admixture inflow part 71 which is a location which injects the admixture C is downstream (injection nozzle) rather than the area | region (air inflow part 62) immediately after the air jet Ja was injected. 10 side), the high pressure constituting the swirling flow 6af is such that the admixture can be injected through the through-hole 72 by setting an appropriate distance from the air inflow portion 62 to the through-hole 72 of the admixture inflow portion 71. Air pressure can be reduced. According to the experiment conducted by the inventor, this distance needs to be 50 cm or more.
According to the above-described configuration, for example, the air supply system La that supplies high-pressure air and the admixture supply system Lc that air-transports the admixture C are supplied with the same amount of air from the same air compressor 2. However, at the location where the admixture C is injected into the flow path 7f of the admixture adding device 7 (for example, in a direction perpendicular to the flow path 7f), the pressure of the high-pressure air constituting the swirling flow 6af decreases. Therefore, the admixture C (curtain Jc) can be sprayed.

In FIG. 3, for example, the mixing method of mixing the spray material M and the admixture C used in the spraying method using the mixing system 100 of the illustrated embodiment roughly includes the following three steps. .
(1) The high pressure air injected from the spraying material pumping system Lm and the high pressure air A flowing through the air supply system La in the air adding device 6 and injected into the flow path 6f of the air adding device 6 The step of scraping off the pressure-fed spray material M into a large number of strips Mp by the air jet Ja of air A and / or the swirling flow 6af (step S2 in FIG. 3).
(2) A step of injecting the admixture C supplied from the admixture supply system Lc into the flow path 7f in the admixture addition device 7 in the form of an air curtain (S3 in FIG. 3).
(3) When the small piece Mp of the spray material scraped off by the air jet Ja and / or the swirl flow 6af passes through the admixture C injected in the form of an air curtain, the admixture is applied to the surface of the spray material small piece Mp. Step of applying C (step S4 in FIG. 3).
In FIG. 3, step S1 shows a process of conveying the spray material M to the air addition device 6, and step S5 transports a small piece Mp of the spray material with the admixture C applied to the surface to the nozzle 10 (not shown). The process is shown.

According to the mixing system 100 according to the illustrated embodiment, in the air addition device 6, a large number of high pressure air A air jets Ja and / or swirl flows 6 af are used to generate a large number of pressures from the spray material M that is pumped from the spray material pumping system Lm. The small piece or the thin piece Mp is scraped off and taken to the downstream side (the injection nozzle 10 side).
The adhering material C is applied to the entire surface of the spray material strip Mp when it passes through the admixing material C sprayed into the flow path 7f in the admixing material adding device 7.

By applying the admixture C onto the surface of the spray material strip Mp, the spray material strips Mp do not adhere to each other, and the small pieces Mp can be prevented from adhering to grow into a large lump.
Therefore, no matter how the distance from the location where the spray material M and the admixture C are mixed to the injection nozzle 10 is set, the spray material is properly conveyed by air and injected from the injection nozzle 10.

And since the small piece Mp of the spray material with which the admixture C was apply | coated to the surface maintains the state isolate | separated from each other and it is prevented from growing into a lump, it sprays from the air addition apparatus 6 and the admixture addition apparatus 7 There is no formation of a large mass Md that stays in the flow path to the nozzle 10 or closes the flow path, and no “pulsation” occurs in the flow path.
That is, in the illustrated embodiment, there is no fear that the spray material M will harden in the flow path from the portion where the spray material M and the admixture C are mixed to the injection nozzle 10, and the occurrence of pulsation in the pipe system is suppressed. it can.

  Further, since the small piece Mp of the spray material passes through the portion where the admixture C is injected, the admixture C is uniformly applied to the entire surface of the small piece Mp of the spray material. The amount of C added is also constant, so that an admixture more than necessary is not supplied to the spray material M (Mp). As a result, the consumption of the admixture C is reduced.

  It should be noted that the illustrated embodiment is merely an example and is not intended to limit the technical scope of the present invention.

The block diagram which shows embodiment of this invention. The partial block diagram in FIG. The schematic cross section which shows the air addition apparatus and admixture addition apparatus which are used in embodiment. FIG. 4 is a schematic cross-sectional view illustrating in detail the operation in the air addition device in FIG. 3. The schematic cross section which shows the admixture addition apparatus used by embodiment. Explanatory drawing which shows the state by which the strip of spray material is scraped off with the air addition apparatus used by embodiment. Explanatory drawing which shows the state in which the spraying materials scraped off by each small piece as shown in FIG. 6 mutually adhere in the prior art. In embodiment, explanatory drawing which showed the state by which the strip of spraying material passes the curtain-shaped admixture, and the spraying materials are not adhere | attaching the downstream. The partial side view explaining the structure around the spray material injection apparatus of a prior art. FIG. 10 is a partial side view for explaining a configuration around a spray material injection device of a prior art different from FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spraying material pressure feed pump 2 ... High pressure air supply source / air compressor 3 ... Admixture pressure feed pump 4 ... High pressure air distributor 5 ... Confluence pipe | tube (mixing pipe | tube) of admixture and air )
6 ... Air addition device 7 ... Admixture addition device 72 ... Through hole 73 ... Junction tube 74 ... Taper tube 75 ... Adapter 10 ... Nozzle La ... Air supply system Lc ... Admixture supply system Lm ... Spraying material pumping system 100 ... Mixing system

Claims (4)

  A spray material pumping system (Lm) that pumps the spray material (M), an air supply system (La) that supplies high-pressure air (A), and an admixture supply system (Lc) that transports the admixture (C) by air. , The addition of air in which the spray nozzle (10) for injecting a mixture of the spray material (M), air (A) and the admixture (C), the spray material pumping system (Lm) and the air supply system (La) join An apparatus (6) and an admixture addition apparatus (7) that is provided downstream of the air addition apparatus (6) and adds the admixture (C) to the mixed flow of the spray material (M) and air (A). In the air addition device (6), the air supply system (La) is inclined with respect to the spray material pressure feeding system (Lm), and the high-pressure air (A) is a flow path (6f) of the air addition device (6). Is formed to form a swirl flow (6af) that swirls in a spiral shape, and the admixture addition device (7) Mixing system, characterized in that the road (7f) admixtures are admixtures supply system as injected into the (Lc) is connected.   The mixing system according to claim 1, wherein the admixture adding device (7) is configured such that the admixture is injected in a direction perpendicular to the flow path (6f) of the air adding device (6).   In carrying out the present invention, the air supply system (La) for supplying high-pressure air (A) and the admixture supply system (Lc) for conveying the admixture (C) to the same high-pressure air supply source (2) The mixing system according to claim 1, which is connected.   In the mixing method using the mixing system of any one of Claims 1-3, the spray material (M) and the air supply system (La) pumped by the spray material pumping system (Lm) by the air addition device (6) The high-pressure air (A) flowing through the air addition device (6) is joined together, and the spray material (M) is fed in small pieces by the swirling flow (6af) of the high-pressure air (A) spirally swirling in the flow path (6f) of the air addition device (6). The step of scraping, the step of injecting the admixture (C) supplied from the admixture supply system (Lc) into the flow path (7f) by the admixture addition device (7), and the high pressure air (A) And the step of applying the admixture (C) to the surface of the sprayed material piece (Mp) when the sprayed material piece (Mp) passes through the injected admixture (C). A mixing method characterized by.

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