JP4523113B2 - Mixing and dispersing equipment - Google Patents
Mixing and dispersing equipment Download PDFInfo
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- JP4523113B2 JP4523113B2 JP2000131433A JP2000131433A JP4523113B2 JP 4523113 B2 JP4523113 B2 JP 4523113B2 JP 2000131433 A JP2000131433 A JP 2000131433A JP 2000131433 A JP2000131433 A JP 2000131433A JP 4523113 B2 JP4523113 B2 JP 4523113B2
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Description
【０００１】
【発明の属する技術分野】
この発明は、低粘性液体の結合材スラリーを、導管に導入された乾燥混合物に混合して分散させる混合分散装置に関し、特に、建築物の耐火被覆施工に用いる吹付施工用の混合分散装置に関するものである。
【０００２】
【従来の技術】
建築構造物の躯体として用いられる鉄骨には耐火被覆が必要とされ、一般には、ロックウール等の無機繊維材料とセメントスラリーとを混合して分散させる半乾式吹付耐火被覆材施工（半乾式吹付工法）や、水硬性セメント等からなるモルタルや高粘性スラリーをポンプで圧送して吹き付ける湿式吹付耐火被覆材施工（湿式吹付工法）が主流である。なお、湿式吹付工法としては、前記モルタルや高粘性スラリーと別系統で硬化促進剤等の低粘性液体を圧送し、混合分散しつつ吹き付ける湿式吹付工法も行われている。この湿式吹付工法に関しては、粘性水硬スラリー中への低粘性流体の混合方法として特開平２−２３３１６１に開示されている。
【０００３】
ここで、従来の半乾式吹付工法に使用される混合分散装置を説明するに、図1に示されるように、圧縮空気により無機繊維材料を搬送するために搬送ホースにつながる導管１と、その導管１の吐出口中心付近に吐出口に向かってセメントスラリーを噴霧するスラリーノズル２を配設したものである。同様の例は、特開昭５８−２７６６１に吹付用ガン先として挙げられている。
【０００４】
この混合分散装置において、搬送ホースを介して圧縮空気により導管１に導入された無機繊維材料は、前記導管１の吐出口部分において、スラリーノズル２から噴霧されるセメントスラリーと混合分散、湿潤されて施工面に吹き付けられるものである。
【０００５】
図1に示されるような混合分散装置にあっては、スラリーノズルから噴霧されるセメントスラリーの噴射角が導管の吐出口から噴射される繊維材料の噴射角より小さくなっているため、セメントスラリーの外側帯域において、繊維材料はセメントスラリーによる湿潤作用を十分受けられず、粉塵となって飛散する欠点があった。また、同様の理由により導管の吐出口と被施工面との距離の変化に応じて繊維材料とセメントスラリーに混合ムラが生じることがあった。
【０００６】
さらに、繊維材料は吐出口部分で導管内に設けられたセメントスラリー噴霧用ノズルによりその流速が部分的に変化し、繊維材料の吐出量に偏りが生じたりするため、吐出される繊維材料とセメントスラリーとの混合にムラが生じ、ひいては均質な吹付層が得られなかった。
【０００７】
また、セメントスラリーの噴霧用ノズルからはセメントスラリーがシャワー状もしくはミスト状に噴霧されるために、セメントスラリーと繊維材料の絡みや吹付層を締め固める作用が弱く、吹付層の嵩密度は０．２〜０．４ｇ／ｃｍ 3 程度と低く、また、吹付材の凝集力も小さいため、形成された吹付層は発塵量が多くエアチャンバー等には不適であり、また、機械的衝撃に弱く、施工中の損傷が多いという欠点があった。さらに、耐火性を確保するためにコテ押さえの作業や吹付層の過大な厚さが必要であった。
【０００８】
そこで、図２に示されるような混合分散装置が提案された。すなわち、導管内におけるセメントスラリー噴霧用ノズルの影響を避けるために、導管の内周面に設けた間隙から結合材スラリーを導管内に噴出させるもので、導管内の繊維材料は、僅かに内周面沿いで遅いものの全てほぼ一定の速度で流れる。このような繊維材料の流れに対し、内部に噴出する結合材スラリーは、図示のように、導管の内周面沿いに多量に分布し、導管の中心まで到達できないので、中心部を流れる繊維材料に絡み難く、吹付け施工時の混合ムラや粉塵の発生が多くなり、また、結合材スラリーが導管内周面に沿って導管の先端の吐出口からダレ落ちることが多かった。
【０００９】
さらに、図３に示されるように、吐出口部分において、結合材スラリーを導管の内周面に設けた噴出口から噴出すると共に、この結合材スラリー噴出口の上流側において、導管内径を絞り込む傾斜を導管の内周面に設け、いわゆる円筒状オリフィスを形成することによって、噴出口での速度圧を低くして、結合材スラリーの噴出を容易にする混合分散装置が提案された。
【００１０】
【発明が解決しようとする課題】
しかしながら、このような混合分散装置においては、円筒状オリフィスに対して導管内を送られてくる繊維材料の絡むことがあり、充分な混合分散を行わせることができるとは限らなかった。
【００１１】
この発明はこのような問題点を解消するためになされたもので、繊維材料と結合材スラリーを別系統で圧送し、円筒状オリフィスを通して混合分散させて吹き付ける半乾式吹付工法に使用して、繊維材料の絡むことがなく、広範囲の繊維材料と結合材スラリーを充分に混合、分散、湿潤化させて均質に吹き付けることが出来る混合分散装置を提供しようとするものである。
【００１２】
【課題を解決するための手段】
本発明に係る混合分散装置は、第１材料を圧縮空気により搬送するための導管と、この導管の吐出口部分の内周面に設けられた、第２材料を導管にほぼ直交する方向から導入するための噴出口を有する円筒部と、この円筒部の上流側で導管内径を絞り込むための第１傾斜部とこの円筒部の下流側で導管内径を拡開させるための第２傾斜部が形成された円筒状オリフィスとからなる混合分散装置において、前記円筒状オリフィスは、円筒部の長さＬと導管の内径Ｄとの比（Ｌ／Ｄ）が０．１〜２．０、前記円筒部の内径ｄと導管の内径Ｄとの比（ｄ／Ｄ）が０．２〜０．８、第１傾斜部の導管軸と平行な線に対する角度αが１０〜６０度、第２傾斜部の導管軸と平行な線に対する角度βが１０〜８０度に形成し、前記円筒部の上流側側縁に円筒部の内径より小さな直径の開口が形成された弾力性を有するオリフィス体を配設したことを特徴とするものである。好ましくは、前円筒状オリフィスにおける、円筒部の長さと導管の内径との比は０．３〜１．５、その内径と導管の内径との比は０．３〜０．６５、第１傾斜部の角度αおよび第２傾斜部の角度βは共に１０〜４５度である。
【００１３】
さらに、好適には、第１材料が繊維質材料、第２材料が水硬性材料および水とからなる結合材スラリーであることである。
【００１４】
また、第１材料が繊維質材料および粉体材料とからなる乾燥混合物、第２材料が水である場合も好適である。
【００１５】
なお、繊維質材料は、ロックウールやグラスウール等の無機質繊維材料やパルプ等の有機質繊維材料とすることができ、粉体材料としては、石膏、セメント等の水硬性材料、炭酸カルシウム、パーライト、バーミキュライト等の粉体材料とすることができる。
【００１６】
また、第２材料は、石膏、セメント等の水硬性材料および水からなる結合材スラリーまたは水とすることができる。
【００１７】
【発明の実施の形態】
以下、本発明の実施の形態である混合分散装置を添付図面に基づいて説明する。
先ず、図3及び図4に示される従来の混合分散装置においては、第１材料（繊維材料）を圧縮空気により搬送するための導管７と、この導管７の吐出口部分の内周面に、円筒状オリフィス８を有し、該円筒状オリフィス８の円筒部８ａには、第１導管７の軸方向すなわち第１材料の流れに対して直角の向きに向けられた略円形の第２材料（結合材スラリー）の噴出口９が、円周方向に等間隔に複数個、例えば１円周上に４ヶ所（好適には６ヶ所〜８ヶ所）設けられている。また、円筒状オリフィス８の内周面は、この噴出口９の上流側における第１傾斜部により円筒部８ａの内周面は導管７内周面に連続している。さらに該噴出口９の下流側においても同様に第２傾斜部により円筒部８ａの内周面は導管７の内周面に連続し、吐出口７ｂを形成している。
【００１８】
したがって、このような混合分散装置においては、図示しない搬送ホースから圧縮空気により送られてきた繊維材料は、導管７の導入側７ａから導入され、また、同様に図示しない第２材料搬送ホースにより送られてきた結合材スラリーが、円筒状オリフィス８の円筒部８ａの結合材スラリー噴出口９外周側のチャンバー１０にスラリー導入口１１から導入され、このチャンバー１０から円筒状オリフィス８の中心方向に向けた噴出口９から中心に向かって高い圧力で噴出される。複数の噴出口９から噴出された結合材スラリーは、円筒部８ａの中心付近で相互に衝突、跳ね返り、円筒部８ａ内に結合材スラリーの略スクリーン状態を形成する。搬送されてきた繊維材料はこの結合材スラリーのスクリーン状態部分を通過し、さらに、搬送のための圧縮空気の力により導管７の吐出口７ｂから吐出され、被覆対象面に吹き付けられる。したがって、この時、繊維材料がムラ無く結合材スラリーに覆われ、充分に混合分散、湿潤化されることにより、繊維材料による粉塵飛散が無く、また、噴出した結合材スラリーのスクリーンを通過した繊維材料は、結合材スラリーに覆われて質量が増すために、均質で密度の高い吹付層を形成することができ、結果、吹付層の比重の向上や凝集力の増大が可能である。
【００１９】
このような混合分散装置は、結合材スラリー噴出口９が円筒状オリフィス８の円筒部８ａに設けられ、さらには、結合材スラリー噴出口９の上流側における傾斜により導管内周面が絞り込まれた構造となり、繊維材料は導管７内を下流に向かって流れつつ円筒部８ａの軸心方向に向かって流れ、一方、噴出口９壁面付近では速度圧が低く、更には中心位置までの距離が小さくなることで、結合材スラリーが円筒部８ａの中心部まで充分に届き、結合材スラリーのスクリーン状態を形成する。これによって繊維材料は結合材スラリーと充分に混合され、湿潤化される。さらに、導管内径の絞り込みによって増大した流速を円筒部８ａの下流の傾斜部により導管内径を拡張することで、流速を減少させ、吹付面での跳ね返りを抑え、両材料の飛散やロスを低減させることができる。したがって、もし、図３に示すような円筒状オリフィス８を有さず、導管内径が一定の場合には、導管内の流速は僅かに壁面沿いが遅いもののほぼ一定の速度分布で流れるため、導管内から吐出される結合材スラリーは、図示されるように壁面沿いに多量に分布し、導管中心部まで到達せず、中心付近を通過する繊維材料は結合材スラリーに被覆され難く吹付時の混合ムラや粉塵の発生が多くなる。また、導管内に噴出する結合材スラリーも導管内壁面に沿って導管吐出口からダレ落ちることが多くなる。
【００２０】
なお、この混合分散装置は、内径Ｄが４６ｍｍの導管に対して、円筒状オリフィス８の内径ｄは２０ｍｍ、同円筒部８ａの長さＬは２５ｍｍ、第１傾斜部の導管軸と平行な線に対する角度αが１５度、第２傾斜部の同角度βが３４度を有しており、オリフィスの円筒部８ａの長さＬと導管７の内径Ｄとの比は０．５４、オリフィスの内径ｄと導管７の内径Ｄとの比は０．４３である。また、円筒状オリフィス８の内径ｄが２５ｍｍ、同円筒部の長さＬが６５ｍｍ、角度αが１０度、βが２０度、すなわち、オリフィス円筒部の長さＬと導管７の内径ｄとの比が１．４１、オリフィスの内径ｄと導管７の内径Ｄとの比が０．５４とすることも出来る。なお、結合材スラリーの噴出孔９は直径２ｍｍまたは３ｍｍの円形をなしているが、これらの形状は楕円形や多角形とすることも可能である。また、繊維材料としては綿状に解繊したパルプ繊維を使用し、結合材スラリーとしてはポルトランドセメントまたは石膏プラスター１００質量部に水１００〜２００質量部を加え混合攪拌した分散液が用いられる。これにより得られる吹付層は、均質でその嵩密度がおよそ０．４〜０．８ｇ／ｃｍ3の範囲で自由に調整でき、さらに、可燃性のパルプを使用しながら高い耐燃性及び耐火性を付与することができる。ところで、繊維材料としてロックウールやグラスウール等の無機質繊維を用いることもできるが、ある種の繊維材料においては、円筒状オリフィスの円筒部において繊維材料が絡み易く、この場合には充分な混合分散を行わせることが困難であった。なお、結合材スラリーとしては他の水硬性材料と水から構成することもできる。
【００２１】
本発明は、このような混合分散装置の改良に係り、図５及び図６に示すように、オリフィス８の円筒部８ａの上流側側縁に、円筒部８ａの内径よりも小さな直径の開口を形成した弾力性を有するオリフィス１２を配設したものである。
なお、このようなオリフィス体１２は、弾力性を有する材料によって作るものである。これにより、オリフィス８の円筒部８ａの結合材スラリーの噴出部９の速度圧がさらに軽減され、形成される結合材スラリースクリーンが安定し、繊維材料に対する混合分散性が向上するものである。また、弾力性を有するオリフィス１２を用いることで導管内を送られてくる繊維材料は該弾力性を有するオリフィス体１２に絡むことなく結合材スラリーのスクリーンを滑らかに通過することができる。
【００２２】
【発明の効果】
以上説明したように、この発明の混合分散装置によれば、第１材料を圧縮空気により搬送するための導管と、この導管の吐出口部分に設けられ、第２材料を第１材料の流れにほぼ直交する方向から導入するための噴出口を有する円筒部と内周面を絞り込む第１傾斜部と拡開する第２傾斜部とが形成された円筒状オリフィスとからなり、円筒部の上流側側縁に円筒部の内径より小さな直径の開口が形成された弾力性を有するオリフィス体を配設したので、第１材料として繊維材料等を第２材料として結合材スラリー等を使用する半乾式吹付工法に用いるときに、吹付時の繊維材料等による粉塵飛散が無く、また、混合ムラの少ない均質で密度の高い安定した吹付層を得ることが可能となると共に、広い範囲の繊維材料がオリフィス体に絡むことなく、一層優れた結合材スラリーの混合分散が行われることができる。
【図面の簡単な説明】
【図１】 従来の吹付ノズルを示す断面図である。
【図２】 従来の他の吹付ノズルを示す断面図である。
【図３】 従来の混合分散装置の断面図である。
【図４】 従来の混合分散装置の正面図である。
【図５】 本発明の実施の形態である混合分散装置の断面図である。
【図６】 本発明の実施の形態である混合分散装置の正面図である。
【符号の説明】
１，７…導管、７ｂ…吐出口、８…オリフィス、８ａ…円筒部、９…結合材スラリー噴出口、１０…チャンバー、１１…スラリー導入口、１２…オリフィス体。[0001]
BACKGROUND OF THE INVENTION
The present invention, the binder slurry of low viscosity liquids, relates mixing and dispersing device for dispersing by mixing the introduced dry mixture in the conduit, in particular, it relates to mixing and dispersing device for spraying installation to be used for fire protection construction of a building It is .
[0002]
[Prior art]
The steel used as precursor of the building structure is required fireproofing generally, semidry sprayed refractory coating material construction (semidry spraying method of dispersing a mixture of a mineral fiber material and cement slurry, such as rock wool ) And wet spraying fireproof coating construction (wet spraying method) in which a mortar or hydraulic slurry made of hydraulic cement or the like is pumped and sprayed is pumped. As the wet spray method, said mortar or low viscosity liquids, such as high-viscosity slurry and another system at the curing accelerator pumping, has also been wet spraying method of spraying while mixing and dispersion. For this wet spraying method is disclosed in JP-A-2-233161 as a method for mixing low-viscosity fluids to viscous water hardness slurry.
[0003]
Here, in order to explain the mixing and dispersing apparatus used in the conventional semi-dry spray method, as shown in FIG. 1, a
[0004]
In the mixing and dispersing device, an inorganic fibrous material introduced into the
[0005]
In the mixing and dispersing apparatus as shown in FIG. 1, since the injection angle of the cement slurry sprayed from the slurry nozzle is smaller than the injection angle of the fiber material injected from the discharge port of the conduit, In the outer zone, the fiber material cannot be sufficiently wetted by the cement slurry, and has a drawback of scattering as dust. For the same reason, uneven mixing may occur between the fiber material and the cement slurry in accordance with the change in the distance between the discharge port of the conduit and the work surface.
[0006]
Furthermore, since the flow rate of the fiber material is partially changed by the cement slurry spray nozzle provided in the conduit at the discharge port portion, and the discharge amount of the fiber material is biased, the discharged fiber material and cement Unevenness occurred in mixing with the slurry, and as a result, a homogeneous spray layer could not be obtained.
[0007]
Further, since the cement slurry is sprayed in a shower or mist form from the nozzle for spraying the cement slurry, the entanglement between the cement slurry and the fiber material and the action of compacting the spray layer are weak, and the bulk density of the spray layer is 0. Since it is as low as about 2 to 0.4 g / cm 3 and the cohesive force of the spray material is small, the formed spray layer has a large amount of dust generation and is unsuitable for an air chamber or the like, and is weak against mechanical impacts. There was the fault that there was much damage during construction. Furthermore, in order to ensure fire resistance, the work of holding the iron and the excessive thickness of the spray layer were required.
[0008]
Accordingly, a mixing and dispersing apparatus as shown in FIG. 2 has been proposed. That is, in order to avoid the influence of the cement slurry spray nozzle in the conduit, the binder slurry is ejected into the conduit from the gap provided on the inner peripheral surface of the conduit, and the fiber material in the conduit is slightly in the inner periphery. Everything that is slow along the surface flows at a nearly constant speed. As shown in the figure, the binder slurry spouted to the inside is distributed in a large amount along the inner peripheral surface of the conduit and cannot reach the center of the conduit. In many cases, mixing irregularities and dust generation during spraying are increased, and the slurry of the binder is often dripped from the discharge port at the end of the conduit along the inner peripheral surface of the conduit.
[0009]
Further, as shown in FIG. 3, at the discharge port portion, the binding material slurry is ejected from the ejection port provided on the inner peripheral surface of the conduit, and at the upstream side of the coupling material slurry ejection port, the inner diameter of the conduit is narrowed. Has been proposed on the inner peripheral surface of the conduit to form a so-called cylindrical orifice, thereby reducing the velocity pressure at the outlet and facilitating the ejection of the binder slurry.
[0010]
[Problems to be solved by the invention]
However, in such a mixing and dispersing apparatus, the fiber material sent through the conduit may be entangled with the cylindrical orifice, so that sufficient mixing and dispersing cannot always be performed.
[0011]
The present invention has been made to solve such problems, a binder slurry and fiber material was pumped on a separate line, using a semi-dry spray method of spraying a mixed dispersed allowed through cylindrical orifices, fibers without involving the material, mixing the binder slurry with a wide range of fibrous materials sufficiently, distributed, it is to attempt to provide a mixing and dispersing device which can be sprayed homogeneously by wetting.
[0012]
[Means for Solving the Problems]
The mixing and dispersing apparatus according to the present invention introduces a conduit for conveying the first material by compressed air and the second material provided on the inner peripheral surface of the discharge port portion of the conduit from a direction substantially perpendicular to the conduit. A cylindrical portion having a spout for forming a first inclined portion for narrowing the inner diameter of the conduit on the upstream side of the cylindrical portion, and a second inclined portion for expanding the inner diameter of the conduit on the downstream side of the cylindrical portion. In the mixing and dispersing apparatus comprising the cylindrical orifice, the cylindrical orifice has a ratio (L / D) of the length L of the cylindrical portion to the inner diameter D of the conduit of 0.1 to 2.0, and the cylindrical portion The ratio (d / D) of the inner diameter d to the inner diameter D of the conduit is 0.2 to 0.8, the angle α of the first inclined portion with respect to the line parallel to the conduit axis is 10 to 60 degrees, and the second inclined portion An angle β with respect to a line parallel to the conduit axis is formed at 10 to 80 degrees, and a cylindrical portion is formed on the upstream side edge of the cylindrical portion. An elastic orifice body in which an opening having a diameter smaller than the inner diameter is formed is provided. Preferably, in the front cylindrical orifice, the ratio of the length of the cylindrical portion to the inner diameter of the conduit is 0.3 to 1.5, the ratio of the inner diameter to the inner diameter of the conduit is 0.3 to 0.65, and the first inclination The angle α of the part and the angle β of the second inclined part are both 10 to 45 degrees.
[0013]
Further, preferably, the first material is a fibrous material, and the second material is a binder slurry composed of a hydraulic material and water.
[0014]
It is also preferable that the first material is a dry mixture composed of a fibrous material and a powder material, and the second material is water.
[0015]
The fibrous material may be an inorganic fiber material such as rock wool or glass wool, or an organic fiber material such as pulp, and the powder material may be a hydraulic material such as gypsum or cement, calcium carbonate, perlite, or vermiculite. Or a powder material such as
[0016]
The second material may be gypsum, and a binder slurry or water consisting hydraulic material and water such as cement.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a mixing and dispersing apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, in the conventional mixing and dispersing apparatus shown in FIG. 3 and FIG. 4, a conduit 7 for conveying the first material (fiber material) by compressed air, and an inner peripheral surface of the discharge port portion of the conduit 7, has a cylindrical orifice 8, the cylindrical portion 8a of the cylindrical orifice 8, a substantially circular second material directed at right angles the direction to the flow in the axial direction, i.e. the first material of the first conduit 7 ( A plurality of jetting holes 9 for the binder slurry) are provided at equal intervals in the circumferential direction, for example, four locations (preferably 6 to 8 locations) on one circumference . Further, the inner peripheral surface of the cylindrical orifice 8, the inner circumferential surface of the cylindrical portion 8a is to continue with the inner conduit 7 circumferential surface by the first inclined portion on the upstream side of the spout 9. Furthermore the inner circumferential surface of the cylindrical portion 8a by the second inclined portion also in the downstream side of the該噴outlet 9 continuous to the inner peripheral surface of the conduit 7 to form a discharge port 7b.
[0018]
Therefore, in such a mixing and dispersing apparatus , the fiber material sent by the compressed air from the conveyance hose (not shown) is introduced from the introduction side 7a of the conduit 7 and also sent by the second material conveyance hose (not shown). It is to have binder slurry is introduced from the slurry introducing port 11 into the chamber 10 of the binder slurry spout 9 outer peripheral side of the cylindrical portion 8a of the cylindrical orifice 8, directed from the chamber 10 toward the center of the cylindrical orifice 8 It is ejected at a high pressure from the spout 9 toward the center. Binder slurry ejected from a plurality of ejection ports 9, collide with each other near the center of the cylindrical portion 8a, rebound, to form a substantially screen state of the binder slurry in the cylindrical portion 8a. Fiber material was manner is conveyed to pass through the screen state portion of the binder slurry, further, is discharged from the discharge port 7b of the conduit 7 by the force of compressed air for transport, it is blown to the coated target surface. Therefore, at this time, the fiber material is covered with evenly binder slurry, thoroughly mixed and dispersed by Rukoto is wetted, there is no dust scattering by the fiber material was also passed through the screen of the ejected binder slurry fibers material, in order to increase the mass covered with binder slurry, homogeneous can be formed a dense spray layers, the result, it is possible to increase the improvement and cohesive force of gravity of the spray layer.
[0019]
Such mixing and dispersing devices, binder slurry spout 9 is provided in the cylindrical portion 8a of the cylindrical orifice 8, further conduit peripheral surface narrowed by us Keru inclined to the upstream side of the binding material slurry spout 9 the structure and Do Ri, fiber material flows toward the axial direction of the cylindrical portion 8a while flows in a conduit 7 downstream, while the spout 9 wall around at low speed pressure is more central position As a result, the binder slurry reaches the center of the cylindrical portion 8a sufficiently, and forms a screen of the binder slurry. This fibrous material is thoroughly mixed with the binder slurry, it is wetted. Furthermore, by extending the conduit inside diameter by the downstream inclined portion of the increased flow rate the cylindrical portion 8a by narrowing of the conduit inner diameter, to reduce the flow rate to suppress the bounce in spray face reduces scattering and loss of both materials be able to. Accordingly, if, without a cylindrical orifice 8 as shown in FIG. 3, because if the conduit inner diameter is constant, the flow rate in the conduit to flow at a substantially constant velocity distribution although slower along slightly walls, conduit binder slurry that will be discharged from the inner is heavily distributed along the wall as shown, it does not reach the conduit center, fibrous material passing through the vicinity of the center is mixed at the time of hard coated on binder slurry spraying the occurrence of unevenness or dust is that a lot. Further, the binder slurry injected into the conduit also often fall dripping from the conduit discharge opening along the conduit wall.
[0020]
In this mixing and dispersing apparatus, for a conduit having an inner diameter D of 46 mm, the inner diameter d of the cylindrical orifice 8 is 20 mm, the length L of the cylindrical portion 8a is 25 mm, and a line parallel to the conduit axis of the first inclined portion. angle α is 15 degrees relative to, the angle β of the second inclined portion has a 34 °, the ratio of the inner diameter D of the length L and the conduit 7 of the cylindrical portion 8a of the orifice 0.54, the inner diameter of the orifice The ratio of d to the inner diameter D of the conduit 7 is 0.43. The cylindrical orifice 8 has an inner diameter d of 25 mm, a length L of the cylindrical portion of 65 mm, an angle α of 10 degrees, and β of 20 degrees, that is , the length L of the orifice cylindrical section and the inner diameter d of the conduit 7. ratio 1.41, the ratio of the inner diameter D of the inner diameter d and the conduit 7 of the orifice can be 0.54. In addition, although the ejection hole 9 of the binder slurry has a circular shape with a diameter of 2 mm or 3 mm, these shapes may be elliptical or polygonal. As the fiber material using a pulp fiber obtained by fibrillating a flocculent, a dispersion obtained by mixing and stirring adding 100-200 parts by weight of water to 100 parts by weight of Portland cement or gypsum plaster is used as the binder slurry. The sprayed layer obtained by this is homogeneous and its bulk density can be freely adjusted in the range of about 0.4 to 0.8 g / cm 3 , and further, it has high flame resistance and fire resistance while using combustible pulp. Can be granted. By the way, Ru can be used inorganic fibers such as rock wool or glass wool as a fibrous material, in certain fibrous materials, easy fibrous material entangled in the cylindrical portion of the cylindrical orifice, this is the case sufficient mixing and dispersion It was difficult to let The binder slurry can be composed of other hydraulic material and water.
[0021]
The present invention relates to an improvement of such a mixing and dispersing apparatus, and as shown in FIGS. 5 and 6 , an opening having a diameter smaller than the inner diameter of the cylindrical portion 8a is formed on the upstream side edge of the cylindrical portion 8a of the orifice 8. The formed orifice 12 having elasticity is provided .
Such an orifice body 12 is made of a material having elasticity. Thereby, the velocity pressure of the jet part 9 of the binder slurry in the cylindrical part 8a of the orifice 8 is further reduced, the formed binder slurry screen is stabilized, and the mixing and dispersibility with respect to the fiber material is improved. Further, by using the orifice 12 having elasticity, the fiber material sent through the conduit can smoothly pass through the screen of the binder slurry without being entangled with the orifice body 12 having elasticity.
[0022]
【The invention's effect】
As described above, according to the mixing and dispersing apparatus of the present invention, the conduit for conveying the first material by compressed air and the discharge port portion of the conduit are provided, and the second material is changed into the flow of the first material. An upstream side of the cylindrical portion, comprising a cylindrical portion having a jet port for introduction from a substantially orthogonal direction, a cylindrical orifice formed with a first inclined portion that narrows the inner peripheral surface and a second inclined portion that expands. Since the elastic orifice body having an opening having a diameter smaller than the inner diameter of the cylindrical portion is disposed at the side edge, a semi-dry type spray using a fiber material or the like as the first material and a binder slurry or the like as the second material When used in the construction method, there is no dust scattering due to the fiber material, etc. at the time of spraying, and it is possible to obtain a uniform, high-density, stable spray layer with little mixing unevenness, and a wide range of fiber materials can be used for the orifice body. Entangling Ku, can be mixed and dispersed in the more excellent binder slurry is performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a conventional spray nozzle.
FIG. 2 is a cross-sectional view showing another conventional spray nozzle.
FIG. 3 is a cross-sectional view of a conventional mixing and dispersing apparatus.
FIG. 4 is a front view of a conventional mixing and dispersing apparatus.
FIG. 5 is a cross-sectional view of a mixing and dispersing apparatus according to an embodiment of the present invention.
FIG. 6 is a front view of the mixing and dispersing apparatus according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000131433A JP4523113B2 (en) | 2000-04-28 | 2000-04-28 | Mixing and dispersing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000131433A JP4523113B2 (en) | 2000-04-28 | 2000-04-28 | Mixing and dispersing equipment |
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| Publication Number | Publication Date |
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| JP2001310142A JP2001310142A (en) | 2001-11-06 |
| JP4523113B2 true JP4523113B2 (en) | 2010-08-11 |
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| JP2000131433A Expired - Fee Related JP4523113B2 (en) | 2000-04-28 | 2000-04-28 | Mixing and dispersing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3793525B2 (en) * | 2002-08-07 | 2006-07-05 | 日本植生株式会社 | Mortar or concrete mixing method and apparatus and mortar or concrete spraying apparatus |
| JP4137578B2 (en) * | 2002-10-02 | 2008-08-20 | 日本植生株式会社 | Mortar or concrete mixing equipment and mortar or concrete spraying equipment |
| DE102012013815B4 (en) | 2012-07-12 | 2015-10-22 | IMPACT-Innovations-GmbH | Cold gas spray gun with powder injector |
| CN103741938B (en) * | 2014-01-13 | 2016-01-06 | 北京科技大学 | The method of the quick wet shot of a kind of dry powder |
| CN104756970B (en) * | 2015-02-13 | 2017-03-08 | 南京林业大学 | A kind of movable medicine mixer |
| JP2020040020A (en) * | 2018-09-11 | 2020-03-19 | 株式会社大林組 | Spraying method and spray nozzle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115053U (en) * | 1984-07-02 | 1986-01-28 | 品川白煉瓦株式会社 | Spray nozzle for monolithic refractories |
| JPS6168157A (en) * | 1984-09-11 | 1986-04-08 | Shinagawa Refract Co Ltd | Nozzle for spraying concrete or refractory capable of controlling spouting liquid pressure to specified value |
| JPS6183463U (en) * | 1984-11-06 | 1986-06-02 | ||
| JPH11104528A (en) * | 1997-10-03 | 1999-04-20 | Onoda Co | Flesh concrete jetting nozzle device |
| JP3989079B2 (en) * | 1998-03-27 | 2007-10-10 | 株式会社エーアンドエーマテリアル | Spray nozzle |
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