JPH074844A - Method and device for drying aggregate for concrete - Google Patents
Method and device for drying aggregate for concreteInfo
- Publication number
- JPH074844A JPH074844A JP29365993A JP29365993A JPH074844A JP H074844 A JPH074844 A JP H074844A JP 29365993 A JP29365993 A JP 29365993A JP 29365993 A JP29365993 A JP 29365993A JP H074844 A JPH074844 A JP H074844A
- Authority
- JP
- Japan
- Prior art keywords
- aggregate
- rotary container
- hot air
- container
- drying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Drying Of Solid Materials (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンクリート用骨材の
乾燥方法及びその装置に係り、更に詳しくは、コンクリ
ートの物理的，化学的安定性あるいは未硬化のコンクリ
ートと骨材との適切な配合設計その他の条件を決定する
ため、事前に行う試験に用いるコンクリート用骨材（細
骨材，粗骨材その他）の乾燥方法及びその装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for drying aggregate for concrete, and more specifically, to a concrete and physical stability of concrete or an appropriate mixture of uncured concrete and aggregate. The present invention relates to a method for drying concrete aggregates (fine aggregates, coarse aggregates, etc.) used in tests to be performed in advance to determine design and other conditions, and an apparatus thereof.
【０００２】[0002]
【従来の技術】コンクリートに供される砂粒，砕石等の
骨材は、そのコンクリートの使用目的によって若干の相
違はあるが、一般にはコンクリート全体の体積の５０％
以上，多いものでは７０％前後を占める重要な構成材料
である。したがって、骨材の大きさや種類の選定、なら
びに未硬化のコンクリートに対する配合比の設計は、コ
ンクリートの最終的な強度，耐久性及び安定性等を左右
する重要な要素である。このため、骨材の選定及び配合
比を最も的確なものとするべく、予め骨材の試験を行う
ようにしている。2. Description of the Related Art Aggregates such as sand grains and crushed stones used for concrete are generally 50% of the total volume of the concrete, although there are some differences depending on the purpose of use of the concrete.
As mentioned above, it is an important constituent material which accounts for about 70% in many. Therefore, the selection of the size and type of aggregate and the design of the mixing ratio with respect to uncured concrete are important factors that affect the final strength, durability, stability, etc. of concrete. For this reason, in order to make the selection of the aggregate and the compounding ratio most accurate, the aggregate is tested in advance.
【０００３】前記試験にあたっては、先ず試料となる骨
材から、泥分，塩分，有機物その他塵埃等を除去するた
め、骨材に水洗処理を施す必要がある。そして、水洗処
理を施したままでは、試験規格（ＪＩＳ Ａ １１１）
に規定された表面水率０〜２％を満足できないため、骨
材表面に付着している余剰水分に対して乾燥処理を施し
ている。In the above test, it is necessary to wash the aggregate with water in order to remove mud, salt, organic matter and dust from the sample aggregate. And, the test standard (JIS A 111) is still applied after the washing treatment.
Since the surface water ratio of 0 to 2% specified in 1 is not satisfied, the excess water adhering to the surface of the aggregate is dried.
【０００４】前記乾燥処理は、以下の通りである。すな
わち、水洗した骨材を、風雨に晒されないように屋内の
床上に５〜１０cm程度の厚さに敷き広げた後、工業扇風
機等を使用して前記敷き広げた骨材の表面に強制的に空
気を吹き付け、乾燥を促進させる。そして、一定時間後
に骨材の表面が乾燥すると、作業者等がスコップ等を用
いて転地返しを行い、再び工業扇風機等によって強制的
に空気を吹き付ける。この作業を数回繰り返して行い、
骨材全体が乾燥した後、骨材表面の乾燥度合いすなわち
骨材表面水率が０〜１％（但し、試験に使用する骨材に
よっては若干異なる場合がある）となっているか否かを
確認するため、前記骨材をミキサに投入し、攪拌処理を
施して全体的に均質化させてから水分量を計測するよう
にしている。The drying process is as follows. That is, the washed aggregate is spread on an indoor floor to a thickness of about 5 to 10 cm so as not to be exposed to wind and rain, and then the surface of the spread aggregate is forcibly forced using an industrial fan or the like. Blow air to accelerate drying. Then, when the surface of the aggregate is dried after a certain period of time, an operator or the like turns over the ground using a scoop or the like, and forcibly blows air again with an industrial fan or the like. Repeat this work several times,
After the whole aggregate is dried, check whether the degree of drying of the aggregate surface, that is, the water content of the aggregate surface is 0 to 1% (however, it may be slightly different depending on the aggregate used in the test). Therefore, the aggregate is put into a mixer, subjected to a stirring treatment to be homogenized as a whole, and then the water content is measured.
【０００５】計測の結果、骨材表面が０〜１％内に達し
ていない場合は、再度乾燥処理を繰り返して行う。一
方、過度に乾燥し過ぎて表面水率が０％以下となった場
合には、骨材に散水し、最初から乾燥処理をやり直すよ
うにしている。As a result of the measurement, when the surface of the aggregate does not reach within 0 to 1%, the drying process is repeated again. On the other hand, when the surface water rate becomes 0% or less due to excessive drying, water is sprinkled on the aggregate and the drying process is performed again from the beginning.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上記骨材の
乾燥処理方法に関して、以下のような不都合が指摘され
ている。すなわち、水洗処理後の骨材の敷き広げ，転地
返し及びミキサへの投入は、主として作業者による人為
的作業に依存しているため、労力の負担が大きく、ま
た、骨材を屋内に敷き広げるに際し、一回の試験で使用
する骨材の量に対応する床面積は、一般に２０m2以上と
なる場合が殆どであり、この広さを有する場所の確保は
非常に困難である。さらに、作業の最終段階で行う攪拌
処理に際し、特別に攪拌装置を使用することは、コスト
高を助長する上、作業の手間を増幅させる。また、乾燥
処理を過度に繰り返して行うと、各々の骨材の衝突によ
る磨耗等により物理的な破壊変形が生じ、試験の試料と
して使用できなくなる可能性もある。By the way, the following disadvantages have been pointed out with respect to the above-mentioned method of drying aggregate. In other words, the spread of aggregate after washing with water, the turning over and the introduction into the mixer mainly depend on the manual work by the worker, so the labor burden is large and the aggregate is spread indoors. In this case, the floor area corresponding to the amount of aggregate used in one test is generally 20 m 2 or more in most cases, and it is very difficult to secure a place having this size. Further, when a stirring process is performed in the final stage of the work, the use of a special stirring device not only increases the cost but also increases the labor of the work. Further, if the drying treatment is excessively repeated, physical destruction and deformation may occur due to abrasion and the like due to collision of each aggregate, and there is a possibility that it cannot be used as a test sample.
【０００７】また、近年特に需要が高まっている超高強
度コンクリートや超流動化コンクリート等は、通常のコ
ンクリートとは異なり、水とセメントとの混合比である
水セメント比の精度が、強度及び流動性等に直接鋭敏に
影響するため、これら超高強度及び超流動化コンクリー
ト等に供する骨材の含水率の分散（含水率の散らばり具
合）を小さく仕上げる必要がある。具体的には、前記超
高強度コンクリートの調合において、許容できる骨材の
含水率の分散は、最大でも前記水セメント比を０．１％
以上変化させない範囲でなければならない。したがっ
て、水セメント比が例えば２０％の場合は、含水率の分
散を０．０５％以内としなければならず、このような値
を実現するには、従来の乾燥装置及び方法ではほとんど
不可能である。In addition, ultra-high-strength concrete, super-fluidized concrete, and the like, which have been particularly in demand in recent years, differ from ordinary concrete in that the accuracy of the water-cement ratio, which is the mixing ratio of water and cement, is Since it directly and sharply affects the properties, it is necessary to finish the dispersion of the water content (the degree of dispersion of the water content) of the aggregate to be used for these super high strength and super fluidized concrete to be small. Specifically, in the mixing of the ultra-high strength concrete, the dispersion of the water content of the aggregate that can be tolerated is at most 0.1% of the water-cement ratio.
It must be within the range that does not change. Therefore, when the water-cement ratio is 20%, for example, the dispersion of the water content must be within 0.05%, and in order to achieve such a value, it is almost impossible with the conventional drying apparatus and method. is there.
【０００８】上記の問題の他、一般に従来の骨材の乾燥
方法によれば、水洗処理後の骨材を良好な乾燥状態（表
面水率０〜１％以内）とするには多くの時間を必要と
し、その上、例えば夏場のように湿度の高い時期にあっ
てはさらに多くの時間を要する等、気候状態の影響も受
けやすく、定期的な処理計画が損なわれるといった欠点
もあり、新たな骨材の乾燥方法の提供が要請されてい
た。In addition to the above-mentioned problems, generally, according to the conventional method for drying aggregates, it takes a lot of time to bring the aggregates after the water-washing treatment into a good dry state (surface water ratio within 0 to 1%). In addition, there is a drawback that it is susceptible to climate conditions such as requiring more time in high humidity such as summer, and that regular treatment plans are impaired. It was requested to provide a method for drying aggregate.
【０００９】本発明は、上記の問題を解決し得るもので
あって、その目的は、短時間で効率的にかつ性状が均質
で信頼度の高いコンクリート用骨材を得ることのできる
コンクリート用骨材の乾燥方法及びその装置を提供する
ことにある。The present invention is capable of solving the above problems, and an object thereof is to provide a concrete bone material capable of efficiently obtaining a concrete aggregate material having a uniform property with high reliability in a short time. An object is to provide a method for drying a material and an apparatus therefor.
【００１０】[0010]
【課題を解決するための手段】本発明のコンクリート用
骨材の乾燥方法及びその装置のうち、請求項１に記載の
コンクリート用骨材の乾燥方法は、内部に攪拌羽根を有
する回転容器内にコンクリート用骨材を投入し、前記回
転容器を所定速度で所定時間回転させつつ前記回転容器
内外に熱風を送風し、加えて前記骨材の表面温度に基づ
いて前記熱風の温度を加減することを特徴とする。Among the methods and apparatus for drying concrete aggregate according to the present invention, the method for drying concrete aggregate according to claim 1 is a rotary container having a stirring blade therein. Adding concrete aggregate, blowing hot air into and out of the rotary container while rotating the rotary container at a predetermined speed for a predetermined time, and additionally adjusting the temperature of the hot air based on the surface temperature of the aggregate. Characterize.
【００１１】請求項２に記載のものは、請求項１に記載
のものにおいて、回転容器を所定速度で所定時間回転さ
せつつ前記回転容器内外へ熱風を送風して前記回転容器
を加温した後、前記回転容器内に骨材を投入し、さらに
前記回転容器を所定速度で所定時間回転させつつ前記回
転容器内外に熱風を送風し、加えて前記骨材の表面温度
に基づいて前記熱風の温度を加減することを特徴とす
る。According to a second aspect of the present invention, in the first aspect, after rotating the rotary container at a predetermined speed for a predetermined time, hot air is blown into and out of the rotary container to heat the rotary container. , Charging the aggregate into the rotary container, further blowing hot air into and out of the rotary container while rotating the rotary container at a predetermined speed for a predetermined time, and in addition, the temperature of the hot air based on the surface temperature of the aggregate. It is characterized by adjusting.
【００１２】請求項３に記載のものは、請求項１又は請
求項２に記載のものにおいて、骨材の表面温度に基づき
前記熱風の温度を加減して前記骨材の表面水率が所定値
に低減した後、この熱風の送風を停止するとともに前記
回転容器の回転を停止し、次いでこの骨材を外気温度近
くまで冷却した後、再び前記回転容器を所定速度で所定
時間回転させることを特徴とする。According to a third aspect of the present invention, according to the first or second aspect, the temperature of the hot air is adjusted based on the surface temperature of the aggregate so that the surface water rate of the aggregate is a predetermined value. After that, the blowing of the hot air is stopped, the rotation of the rotary container is stopped, the aggregate is cooled to a temperature close to the outside air, and then the rotary container is rotated again at a predetermined speed for a predetermined time. And
【００１３】請求項４に記載のものは、コンクリートに
供する骨材を乾燥させるコンクリート用骨材の乾燥装置
であって、内部に攪拌羽根を有する回転容器と、前記回
転容器を所定速度で所定時間回転させる駆動源と、前記
回転容器内外に熱風を送風する熱風装置と、前記回転容
器内に投入された骨材の表面温度を検出する温度検出器
と、前記温度検出器の検出出力に基づいて前記熱風装置
の加熱温度を自動的に制御するコントロール装置と、か
ら構成したことを特徴とする。According to a fourth aspect of the present invention, there is provided a drying device for concrete aggregate which dries the aggregate to be supplied to concrete, which comprises a rotating container having stirring blades therein and the rotating container at a predetermined speed for a predetermined time. A drive source for rotating, a hot air device for blowing hot air into and out of the rotary container, a temperature detector for detecting the surface temperature of the aggregate put in the rotary container, and based on the detection output of the temperature detector. And a control device for automatically controlling the heating temperature of the hot air device.
【００１４】請求項５に記載のものは、請求項４に記載
のものにおいて、前記攪拌羽根の位置は、前記回転容器
の内周面近くで回転容器の長手方向に沿いかつ軸線に対
してねじれの位置とし、さらに前記攪拌羽根と前記回転
容器内周面との間にスリットを設けたことを特徴とす
る。請求項６に記載のものは、請求項４に記載のものに
おいて、一端側を閉塞端面とし且つ他端側を開口端面と
した前記回転容器の内部に、前記開口端面に近い側の端
部が前記閉塞端面に近い側の端部より前記回転容器の回
転方向先側に位置した攪拌羽根を設けるとともに、前記
回転容器の前記閉塞端面側の内部に、前記閉塞端面に近
い側の端部が前記閉塞端面から遠い側の端部より前記回
転方向先側に位置した戻し羽根を設けたことを特徴とす
る。According to a fifth aspect of the present invention, in the fourth aspect, the position of the stirring blade is along the longitudinal direction of the rotary container near the inner peripheral surface of the rotary container and twisted with respect to the axis. And a slit is provided between the stirring blade and the inner peripheral surface of the rotary container. According to a sixth aspect of the present invention, in the fourth aspect of the present invention, an end portion close to the opening end surface is provided inside the rotary container having one end side as a closed end surface and the other end side as an opening end surface. While providing a stirring blade located in the rotation direction front side of the rotary container from the end on the side closer to the closed end face, inside the closed end face side of the rotary container, the end on the side closer to the closed end face is It is characterized in that a return blade is provided on the front side in the rotation direction from the end portion on the side far from the closed end surface.
【００１５】請求項７に記載のものは、請求項６に記載
のものにおいて、前記戻し羽根は、前記回転容器の回転
時に、この回転容器内部に投入した骨材の積み重なる高
さ以上の大きさに形成したことを特徴とする。請求項８
に記載のものは、請求項４ないし請求項７のいずれかに
記載のものにおいて、一端側を閉塞端面とし且つ他端側
を開口端面とした前記回転容器の内部の前記開口端面側
に、前記開口端面に近い側の端部が前記開口端面から遠
い側の端部より前記回転容器の回転方向先側に位置した
こぼれ防止羽根を設けたことを特徴とする。According to a seventh aspect of the present invention, in the sixth aspect, the return vane has a size equal to or larger than a stacking height of aggregates charged in the rotary container when the rotary container rotates. It is characterized in that it is formed. Claim 8
According to any one of claims 4 to 7, wherein the one end side has a closed end surface and the other end side has an opening end surface, the opening end surface side inside the rotary container is It is characterized in that an spill prevention blade is provided, the end portion of which is closer to the opening end surface is located on the front side in the rotation direction of the rotary container than the end portion of which is far from the opening end surface.
【００１６】請求項９に記載のものは、請求項４ないし
請求項８のいずれかに記載のものにおいて、前記回転容
器の内部に、この回転容器の内面に沿って一端側近くか
ら他端側近くまで延びる複数の粒状化防止突条を設けた
ことを特徴とする。請求項１０に記載のものは、請求項
４ないし請求項９のいずれかに記載のものにおいて、前
記回転容器は、この回転容器の軸線と直交する支持線を
中心として上下方向に旋回可能に配設したことを特徴と
する。According to a ninth aspect of the present invention, according to any one of the fourth to eighth aspects, inside the rotary container, along the inner surface of the rotary container, from near one end side to the other end side. It is characterized in that a plurality of grain-prevention protrusions extending to the vicinity are provided. According to a tenth aspect of the present invention, according to any one of the fourth to ninth aspects, the rotary container is arranged so as to be vertically rotatable about a support line orthogonal to an axis of the rotary container. It is characterized by being set up.
【００１７】請求項１１に記載のものは、請求項４ない
し請求項１０のいずれかに記載のものにおいて、前記コ
ントロール装置に、赤外線を照射して前記回転容器に投
入された骨材表面の水分を検出する赤外線水分計を接続
し、この赤外線水分計の検出出力に基づいて前記回転容
器の回転及び前記熱風装置の稼働を停止させることを特
徴とする。According to an eleventh aspect, in the one according to any one of the fourth to tenth aspects, moisture on the surface of the aggregate, which is radiated to the control device with infrared rays and put into the rotary container, is used. Is connected, and the rotation of the rotary container and the operation of the hot air device are stopped based on the detection output of the infrared moisture meter.
【００１８】請求項１２に記載のものは、請求項４ない
し請求項１１のいずれかに記載のものにおいて、前記熱
風装置を、前記回転容器外周に熱風を送風する灯油バー
ナーと、前記回転容器内部に熱風を送風する電熱ヒータ
ーと、から構成したことを特徴とする。According to a twelfth aspect of the present invention, according to any one of the fourth to eleventh aspects, the hot air device is a kerosene burner for blowing hot air to the outer circumference of the rotary container, and the inside of the rotary container. And an electric heater for blowing hot air.
【００１９】[0019]
【作用】本発明のコンクリート用骨材の乾燥方法及びそ
の装置のうち、請求項１に記載のものによれば、回転容
器内に骨材を投入した後、この回転容器を所定速度で所
定時間回転させつつ回転容器内外へ熱風を送風する。こ
の際、回転容器内の骨材の表面温度が高ければ熱風の温
度を減らし、表面温度が低ければ熱風の温度を加える。
このように、骨材の乾燥を機械的に行う方法であるの
で、人為的作業を必要最小限に抑制するとともに、均質
な骨材を短時間で効率的に得ることが可能である。さら
に、常に的確な温度の熱風を送風することで、乾燥の効
率化を促進するとともに、骨材の熱的変形を防止する。According to the method and apparatus for drying concrete aggregate of the present invention, according to claim 1, after the aggregate is put into the rotary container, the rotary container is kept at a predetermined speed for a predetermined time. Hot air is blown into and out of the rotating container while rotating. At this time, if the surface temperature of the aggregate in the rotary container is high, the temperature of hot air is reduced, and if the surface temperature is low, the temperature of hot air is added.
As described above, since this method is a method of mechanically drying the aggregate, it is possible to suppress the artificial work to a necessary minimum and efficiently obtain a homogeneous aggregate in a short time. Further, by constantly blowing hot air at an appropriate temperature, the efficiency of drying is promoted and the thermal deformation of the aggregate is prevented.
【００２０】請求項２に記載のものによれば、回転容器
を所定速度で所定時間回転させつつ、回転容器内外へ熱
風を送風して前記回転容器を加温した後、骨材をこの回
転容器内に投入し、さらにこの回転容器を所定速度で所
定時間回転させつつ回転容器内外へ熱風を送風する。こ
の際、回転容器内の骨材の表面温度が高ければ熱風の温
度を減らし、表面温度が低ければ熱風の温度を加える。
これによって、回転容器が加温されるまでの間に起こり
得る、各々の骨材あるいは骨材と攪拌羽根との衝突等に
よる骨材の物理的変形を防止させるとともに、回転容器
への骨材の付着が防止され、これによって信頼度の高い
骨材を得ることが可能となる。According to the second aspect of the present invention, while rotating the rotary container at a predetermined speed for a predetermined time, hot air is blown into and out of the rotary container to heat the rotary container, and then the aggregate is removed from the rotary container. It is thrown in and the hot air is blown into and out of the rotary container while rotating the rotary container at a predetermined speed for a predetermined time. At this time, if the surface temperature of the aggregate in the rotary container is high, the temperature of hot air is reduced, and if the surface temperature is low, the temperature of hot air is added.
This prevents physical deformation of the aggregate due to the collision between the aggregate or the aggregate and the stirring blade, which may occur before the rotating container is heated. Adhesion is prevented, which makes it possible to obtain a highly reliable aggregate.
【００２１】ここで、熱風の供給による熱が骨材に残っ
た状態で攪拌を続けると、この加温された骨材と外気と
の接触によって、必要以上に骨材が乾燥してしまう恐れ
がある。請求項３に記載のものは、この点に着目してな
されたもので、骨材の表面温度に基づき前記熱風の温度
を加減して前記骨材の表面水率が所定値に低減した後、
この熱風の送風を停止するとともに前記回転容器の回転
を停止し、次いでこの骨材を外気温度近くまで冷却した
後、再び前記回転容器を所定速度で所定時間回転させ
る。これによって、骨材は、加温後に停止した回転容器
内で一旦冷却されるから、骨材の余剰な乾燥が防止さ
れ、さらに、骨材を冷却した後再び攪拌することによっ
て、一層均質な表面水率を有する骨材を得ることが可能
となる。Here, if stirring is continued in a state where the heat from the supply of hot air remains in the aggregate, the aggregate may be dried more than necessary due to the contact between the heated aggregate and the outside air. is there. The thing of Claim 3 was made paying attention to this point, and after adjusting the temperature of the said hot air based on the surface temperature of an aggregate and reducing the surface water rate of the said aggregate to a predetermined value,
After stopping the blowing of the hot air and stopping the rotation of the rotary container, and then cooling the aggregate to a temperature close to the outside air temperature, the rotary container is again rotated at a predetermined speed for a predetermined time. As a result, since the aggregate is once cooled in the rotating container that has stopped after heating, excessive drying of the aggregate is prevented, and by further cooling and stirring the aggregate, a more uniform surface is obtained. It is possible to obtain an aggregate having a water content.
【００２２】請求項４に記載のものによれば、駆動源の
起動によって内部に攪拌羽根を有する回転容器が所定速
度で所定時間回転し、熱風装置がこの回転容器内外に熱
風を送風する。そして、温度検出器が前記回転容器内の
骨材の温度を検出し、この温度検出器の検出出力に基づ
いて、コントロール装置が前記熱風装置の加熱温度を最
適な値に制御する。このように、回転容器の回転による
攪拌と、熱風装置からの熱風の送風との機械的作業によ
って、骨材を効率よくかつ確実に乾燥させることが可能
である。According to the fourth aspect of the present invention, when the drive source is activated, the rotary container having the stirring blades therein rotates at a predetermined speed for a predetermined time, and the hot air device blows hot air into and out of the rotary container. Then, the temperature detector detects the temperature of the aggregate in the rotary container, and the control device controls the heating temperature of the hot air device to an optimum value based on the detection output of the temperature detector. As described above, it is possible to dry the aggregate efficiently and surely by the mechanical work of stirring by rotating the rotary container and blowing hot air from the hot air device.
【００２３】請求項５に記載のものによれば、前記回転
容器内部の攪拌羽根に位置を、回転容器内周面近くで回
転容器の長手方向に沿ってかつ軸線に対してねじれの位
置としたことで、乾燥処理終了後の骨材の外部への排出
が容易になるとともに、攪拌羽根と回転容器内周面との
間にスリットを設けたことで、攪拌羽根及び回転容器内
に骨材が付着することがない。According to the fifth aspect of the invention, the position of the stirring blade inside the rotary container is set near the inner peripheral surface of the rotary container along the longitudinal direction of the rotary container and at a position twisted with respect to the axis. This facilitates the discharge of the aggregate after the drying process to the outside, and by providing the slit between the stirring blade and the inner peripheral surface of the rotating container, the aggregate is kept inside the stirring blade and the rotating container. Does not adhere.
【００２４】請求項６に記載のものによれば、回転容器
の内部に、開口端面に近い側の端部が閉塞端面に近い側
の端部より前記回転容器の回転方向先側に位置した攪拌
羽根を設けるとともに、回転容器の閉塞端面側の内部
に、閉塞端面に近い側の端部が前記閉塞端面から遠い側
の端部より回転容器の回転方向先側に位置した戻し羽根
を設けたことで、回転容器内に投入された後に閉塞端面
側に集まった骨材は、回転容器の回転に伴い、戻し羽根
の前記回転方向先側の面に当接し、回転容器の開口端面
側へと戻されることになる。したがって、骨材が均質に
攪拌されるとともに、攪拌の効率が向上する。According to the sixth aspect of the present invention, in the inside of the rotary container, the agitator is located such that the end near the opening end face is located further forward than the end near the closed end face in the rotation direction of the rotary container. A blade is provided, and a return vane is provided inside the closed end surface side of the rotary container, the end portion of which is closer to the closed end surface, and the end portion of which is located farther from the closed end surface than the end portion of the rotary container. The aggregate collected on the closed end face side after being put into the rotary container comes into contact with the surface of the return blade on the front side in the rotation direction as the rotary container rotates, and is returned to the opening end face side of the rotary container. Will be done. Therefore, the aggregate is uniformly stirred and the stirring efficiency is improved.
【００２５】ここで、特に前記回転容器を超低速度（例
えば０．３rpm 前後）で回転させる際には、回転容器の
閉塞端面側に集まった骨材に前記戻し羽根が埋没した状
態となり、この戻し羽根と骨材とが一体となって回転し
てしまう。つまり、骨材に戻し羽根が埋没したまま回転
容器が回転すると、当然のことながら、骨材の良好な攪
拌は行われない。請求項７に記載のものは、この点に着
目してなされたもので、前記戻し羽根は、前記回転容器
の回転時に、この回転容器内部に投入した骨材の積み重
なる高さ以上の大きさに形成しているので、戻し羽根と
骨材とが一体となって回転することがない。なお、戻し
羽根の大きさは、一回に投入する骨材の量に対応して形
成するとよい。Here, in particular, when the rotary container is rotated at an extremely low speed (for example, about 0.3 rpm), the return vanes are buried in the aggregate gathered on the closed end face side of the rotary container. The return vane and the aggregate rotate together. That is, if the rotary container is rotated while the return vanes are buried in the aggregate, the aggregate is naturally not well stirred. The invention according to claim 7 is made by paying attention to this point, and the return vane has a size equal to or larger than a stacking height of aggregates charged in the rotary container when the rotary container is rotated. Since it is formed, the return vane and the aggregate do not rotate integrally. In addition, the size of the return vane may be formed corresponding to the amount of the aggregate to be thrown in at one time.
【００２６】請求項８に記載のものによれば、回転容器
の内部に、前記開口端面に近い側の端部が、前記開口端
面から遠い側の端部より前記回転容器の回転方向先側に
位置したこぼれ防止羽根を設けたことで、回転容器の回
転に伴いこの回転容器の開口端面に集まり、回転容器の
外側にこぼれつつある骨材が、こぼれ防止羽根の前記回
転方向先側の面に当接し、回転容器の閉塞端面側へと戻
されることになる。したがって、骨材のこぼれ落ちが防
止され、骨材が均質に攪拌されるとともに、攪拌の効率
が向上する。According to the eighth aspect of the invention, inside the rotary container, the end portion on the side closer to the opening end face is located ahead of the end on the side farther from the opening end face in the rotation direction of the rotary container. By providing the spill prevention blades that are located, the aggregate gathering on the opening end face of this rotary container as the rotary container rotates and spilling to the outside of the rotary container is on the surface of the spill prevention blade on the front side in the rotation direction. It abuts and is returned to the closed end surface side of the rotating container. Therefore, spillage of the aggregate is prevented, the aggregate is uniformly stirred, and the stirring efficiency is improved.
【００２７】ここでまた、例えば回転容器を約５rpm 以
上で回転させる際には、骨材に含有されている微粒子
（例えば泥分等）が、骨材の乾燥が進むに連れて、骨材
の固形粒子に付着して増大していく所謂粒状化現象が発
生する恐れがある。この粒状化現象を防止すべく案出さ
れたものが、請求項９に記載のものであって、前記回転
容器の内部に、この回転容器の内面に沿って一端側近く
から他端側近くまで延びる複数の粒状化防止突条を設け
ている。この粒状化防止突条を備えた回転容器を約０．
１rpm 〜約５rpm 未満の範囲で回転させて攪拌を行う
と、回転容器の回転に伴い、骨材が前記粒状化防止突条
に当接し、粒状化現象は略確実に防止される。特に、回
転容器を超低速度（約１rpm 以下）で回転させると、骨
材の粒状化現象は完全に防止される。Also here, for example, when the rotary container is rotated at about 5 rpm or more, the fine particles (for example, mud content) contained in the aggregate are separated from the aggregate as the drying of the aggregate progresses. There is a possibility that a so-called granulation phenomenon occurs in which the solid particles adhere and increase. What was devised in order to prevent this granulation phenomenon is a thing of Claim 9, Comprising: Inside the said rotary container, from one end side near the other end side along the inner surface of this rotary container. A plurality of extending granulation prevention ridges are provided. A rotary container equipped with this grain-preventing ridge is about 0.
When stirring is carried out by rotating in the range of 1 rpm to less than about 5 rpm, the aggregate comes into contact with the granulation-preventing ridges as the rotary container rotates, and the granulation phenomenon is almost certainly prevented. In particular, when the rotating container is rotated at an extremely low speed (about 1 rpm or less), the granulation phenomenon of the aggregate is completely prevented.
【００２８】請求項１０に記載のものによれば、回転容
器を上下方向に旋回可能としたことで、回転容器内への
骨材の投入及び回転容器内にある乾燥処理終了後の骨材
の外部への排出が容易になる。請求項１１に記載のもの
によれば、赤外線水分計が回転容器内の骨材表面の水分
を検出し、この赤外線水分計の検出出力に基づいて、コ
ントロール装置が前記回転容器の回転及び熱風装置の稼
働を停止させる。これによって、所望の骨材を的確に得
ることが可能になるとともに、回転容器及び熱風装置が
過剰運転することがない。According to the tenth aspect of the present invention, since the rotary container can be swung up and down, the aggregate is put into the rotary container and the aggregate in the rotary container after the drying process is completed. Easily discharged to the outside. According to the eleventh aspect, the infrared moisture meter detects moisture on the surface of the aggregate in the rotary container, and the control device rotates the rotary container and the hot air device based on the detection output of the infrared moisture meter. Stop running. This makes it possible to accurately obtain the desired aggregate and prevent the rotary container and the hot air device from operating excessively.
【００２９】請求項１２に記載のものによれば、回転容
器外周に灯油バーナーで熱風を送風することで、大きい
加熱温度を安価に得ることが可能となる。また、回転容
器内部に電熱ヒーターで熱風を送風することで、骨材の
乾燥を促進させ、この乾燥の際に生じる湿気を好適に排
除することが可能になるとともに、送風によって骨材を
汚染することがない。According to the twelfth aspect, it is possible to obtain a large heating temperature at low cost by blowing hot air with the kerosene burner around the outer circumference of the rotary container. Further, by blowing hot air into the rotary container with an electric heater, it is possible to accelerate the drying of the aggregate, and it is possible to suitably eliminate the moisture generated during this drying, and to contaminate the aggregate by the blowing. Never.
【００３０】[0030]
【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。 （第一実施例）図１ないし図４は、本発明に係るコンク
リート用骨材の乾燥装置の第一実施例を示しており、こ
れらの図において符号１で示すものは実験施設等に配設
した乾燥装置である。Embodiments of the present invention will now be described in detail with reference to the drawings. (First Embodiment) FIGS. 1 to 4 show a first embodiment of a concrete aggregate drying apparatus according to the present invention. The reference numeral 1 in these drawings is arranged in an experimental facility or the like. It is a drying device.
【００３１】乾燥装置１の構成は、以下の通りである。
すなわち、図において符号２で示す回転容器は、円柱体
の内部に空洞部２ａを形成し、一端側の端面に空洞部２
ａと連通する開口部２ｂを形成したものであり、空洞部
２ａには、その内周面に固着した攪拌羽根支持具３によ
って複数の攪拌羽根４を具備している。攪拌羽根４は、
板状体であって、回転容器２の他端側から一端側に向け
て若干傾斜させており、回転容器２の軸心を中心として
対称にかつ内周面との間に空隙（スリット）５を設けて
取り付けられている。The structure of the drying device 1 is as follows.
That is, in the rotary container indicated by reference numeral 2 in the drawing, the hollow portion 2a is formed inside the cylindrical body, and the hollow portion 2a is formed on the end face on one end side.
An opening 2b communicating with a is formed, and the cavity 2a is provided with a plurality of stirring blades 4 by a stirring blade supporting member 3 fixed to the inner peripheral surface thereof. The stirring blade 4 is
It is a plate-like body, is slightly inclined from the other end side of the rotary container 2 toward the one end side, and is symmetric about the axis of the rotary container 2 and has a space (slit) 5 between it and the inner peripheral surface. Is installed.
【００３２】前記回転容器２の周囲は、後述する熱風の
飛散を防止する熱風飛散防止用カバー６と、回転容器２
の下方であってかつ熱風飛散防止用カバー６を支持する
支持板７とによって囲まれている。そして、この支持板
７の上面であってかつ回転容器２の他端側すなわち開口
部２ｂを形成していない側には、減速機付電動機８を配
設している。この減速機付電動機（駆動源）８は、前記
回転容器２の他端側端面に突設したフランジ付回転軸９
に、駆動ベルト１０を介して回転力を供給し、これによ
って回転容器２を回転させるものである。フランジ付回
転軸９は、支持板７に立ち上げて配設した立設板１１を
貫通し、この立設板１１に貫通孔に設けた図示しないボ
ールベアリングによって滑らかに回転するとともに、回
転容器２の他端側が所定位置に支持されている。また、
回転容器２の一端側近傍の支持板７には、ガイドローラ
１２を配設しており、これによって回転容器２の一端側
を所定位置に支持するとともに、回転容器２全体の回転
を可能にしている。Around the periphery of the rotary container 2, a cover 6 for preventing the dispersion of hot air, which will be described later, for preventing the dispersion of hot air, and the rotary container 2 are provided.
And is surrounded by a support plate 7 that supports the hot-air scattering prevention cover 6. An electric motor 8 with a speed reducer is arranged on the upper surface of the support plate 7 and on the other end side of the rotary container 2, that is, on the side where the opening 2b is not formed. The electric motor (drive source) 8 with a speed reducer includes a rotary shaft 9 with a flange that is provided on the other end side end surface of the rotary container 2 so as to project therefrom.
Then, a rotational force is supplied to the rotary container 2 via the drive belt 10 to rotate the rotary container 2. The flanged rotary shaft 9 penetrates a standing plate 11 that is provided upright on the support plate 7, and is smoothly rotated by a ball bearing (not shown) provided in a through hole in the standing plate 11, and the rotary container 2 The other end side of is supported at a predetermined position. Also,
A guide roller 12 is provided on a support plate 7 near one end of the rotary container 2 to support one end of the rotary container 2 at a predetermined position and to rotate the entire rotary container 2. There is.
【００３３】これら支持板７及びその上に配設した各機
器は、基台１３に所定距離離して立ち上げて配設した支
柱１４に支持されかつ上下方向に旋回可能となってい
る。さらに詳しくは、支柱１４の上端に固設したブラケ
ット１４ａに、前記熱風飛散防止用カバー６の両側壁に
固設した支軸１５が係合することによって前記支持板７
及び各機器が支持された構成となっている。The support plate 7 and the devices arranged thereon are supported by columns 14 which are erected upright on the base 13 at a predetermined distance from each other, and are vertically rotatable. More specifically, the support plate 7 is provided by engaging the support shafts 15 fixed to both side walls of the hot-air scattering prevention cover 6 with the brackets 14a fixed to the upper ends of the columns 14.
Also, each device is supported.
【００３４】この支柱１４及び支軸１５は、前記回転容
器２の重心から他端側にずらせた位置にあり、この重心
のずれと前記減速機付電動機８の自重とによって、支持
板７が基台１３上面と一定角度をなし、回転容器２の開
口部２ｂが斜め上方を向いて開口した位置を上の限界位
置（図１参照）としている。また、支持板７の他端側上
方には電動ホイスト１６を設け、この電動ホイスト１６
と支持板７の他端側端縁に設けたプーリ１７とにワイヤ
１８を掛けわたし、電動ホイスト１６がワイヤ１８を引
張して回転容器２の開口部２ｂが斜め下方を向いて開口
した位置を下の限界位置（図２参照）としている。The column 14 and the support shaft 15 are located at a position displaced from the center of gravity of the rotary container 2 to the other end side, and the support plate 7 is formed as a base by the deviation of the center of gravity and the weight of the motor 8 with a reducer. The upper limit position (see FIG. 1) is the position where the opening 2b of the rotary container 2 forms an angle with the upper surface of the table 13 and is directed obliquely upward. An electric hoist 16 is provided above the other end of the support plate 7, and the electric hoist 16 is provided.
The wire 18 is hung over the pulley 17 provided on the other end side edge of the support plate 7, and the electric hoist 16 pulls the wire 18 so that the opening 2b of the rotating container 2 faces diagonally downward. The lower limit position (see Fig. 2) is used.
【００３５】一方、符号１９に示すものは、前記回転容
器２が上の限界位置にあるとき、開口部２ｂから空洞部
２ａに乾燥前の骨材を投入する投入用シュートであっ
て、２０に示すものは、回転容器２が下の限界位置にあ
るとき、空洞部２ａから排出した乾燥後の骨材を誘導す
る排出用シュートである。また、回転容器２の他端側で
あって、熱風飛散防止用カバー６の外側には、この回転
容器２に外部から熱風を送風する灯油バーナー２１を配
設しており、開口部２ｂ側には、この開口部２ｂから空
洞部２ａへ向けて熱風を送風する電熱ヒーター２２を配
設するとともに、空洞部２ａに投入された骨材表面の温
度を検出する赤外線温度検出器２３及び骨材表面の水分
を検出する赤外線水分計２４を配設している。On the other hand, reference numeral 19 is a charging chute for charging the aggregate before drying from the opening 2b into the cavity 2a when the rotary container 2 is at the upper limit position, and 20 Shown is a discharge chute for guiding the dried aggregate discharged from the cavity 2a when the rotary container 2 is at the lower limit position. Further, a kerosene burner 21 for blowing hot air from the outside to the rotary container 2 is provided on the other end of the rotary container 2 and outside the cover 6 for preventing hot air scattering, and the kerosene burner 21 is provided on the opening 2b side. Is provided with an electric heater 22 for blowing hot air from the opening 2b toward the cavity 2a, and an infrared temperature detector 23 and an aggregate surface for detecting the temperature of the aggregate surface introduced into the cavity 2a. An infrared moisture meter 24 for detecting the moisture content of is provided.
【００３６】これら灯油バーナー２１，電熱ヒーター２
２，赤外線温度検出器２３，赤外線水分計２４及び前記
減速機付電動機８は、図４にその構成概念図を示すよう
にコントロール装置２５に接続されており、このコント
ロール装置２５によってそれぞれ機械的に制御されるよ
うになっている。すなわち、赤外線温度検出器２３が、
骨材表面の温度を検出してコントロール装置２５に出力
したとき、コントロール装置２５は、この検出出力に基
づいて灯油バーナー２１及び電熱ヒーター２２の加熱温
度の加減を制御する。一方、赤外線水分計２４が骨材表
面の水分を検出してコントロール装置２５に出力したと
き、コントロール装置２５は、この検出出力が規定の表
面水率に達しているか否かを判断し、達していれば電熱
ヒーター２２，赤外線温度検出器２３，赤外線水分計２
４及び前記減速機付電動機８に出力してそれぞれの駆動
を停止させる。この際、灯油バーナー２１は、機器の保
全のため停止後に冷却する必要があり、コントロール装
置２５に接続した遅延タイマ２７によって一定時間後に
自動停止するようになっている。また、コントロール装
置２５には、灯油バーナー２１及び電熱ヒーター２２に
よる過剰加熱時に発音する異常温度警報装置２８も接続
されている。These kerosene burner 21 and electric heater 2
2, the infrared temperature detector 23, the infrared moisture meter 24, and the electric motor 8 with a speed reducer are connected to a control device 25 as shown in the conceptual diagram of its construction in FIG. It is controlled. That is, the infrared temperature detector 23
When the temperature of the aggregate surface is detected and output to the control device 25, the control device 25 controls the heating temperature of the kerosene burner 21 and the electric heater 22 based on the detected output. On the other hand, when the infrared moisture meter 24 detects the moisture on the surface of the aggregate and outputs it to the control device 25, the control device 25 determines whether or not the detected output has reached a prescribed surface water ratio, and has reached it. Electric heater 22, infrared temperature detector 23, infrared moisture meter 2
4 and the electric motor 8 with a speed reducer to stop the respective driving. At this time, the kerosene burner 21 needs to be cooled after being stopped in order to maintain the equipment, and is automatically stopped after a predetermined time by a delay timer 27 connected to the control device 25. The control device 25 is also connected to an abnormal temperature alarm device 28 that sounds when the kerosene burner 21 and the electric heater 22 overheat.
【００３７】次に、上記の構成からなる乾燥装置１を用
いて骨材を乾燥する方法について説明する。先ず、試験
の試料となる骨材に水洗処理を施し、泥分，塩分，有機
物その他塵埃等を除去する操作を行う。この間、コント
ロール装置２５によって減速機付電動機８を駆動させ、
回転容器２を所定速度で回転させつつ灯油バーナー２１
及び電熱ヒーター２２から熱風を送風し、回転容器２を
加温しておく。Next, a method of drying the aggregate by using the drying device 1 having the above structure will be described. First, the aggregate used as a test sample is washed with water to remove mud, salt, organic matter and other dust. During this period, the control device 25 drives the electric motor 8 with a reducer,
Kerosene burner 21 while rotating the rotary container 2 at a predetermined speed.
Also, hot air is blown from the electric heater 22 to warm the rotary container 2.
【００３８】回転容器２が適当な温度まで加温された
後、投入用シュート１９から水洗処理を施した骨材を投
入する。図において符号２６で示すものが骨材である。
この場合、骨材は人手によって直接投入してもよいし、
ベルトコンベヤ等の公知の技術を適用して自動的に投入
してもよい。このとき、回転容器２は、図１に示す上の
限界位置にあって所定速度で回転しており、投入された
骨材２６は他端側へ集中しつつ攪拌羽根４によって攪拌
される。なお、回転容器２の回転速度は、０．１〜３ｒ
ｐｍの範囲にあるのが好ましく、その最適値は、乾燥す
べき骨材の強度等を考慮して決定すればよい。After the rotary container 2 is heated to an appropriate temperature, the washed aggregate is charged from the charging chute 19. Reference numeral 26 in the figure is an aggregate.
In this case, the aggregate may be directly put in by hand,
You may apply a well-known technique, such as a belt conveyor, and it may input automatically. At this time, the rotary container 2 is at the upper limit position shown in FIG. 1 and is rotating at a predetermined speed, and the introduced aggregate 26 is agitated by the agitating blade 4 while concentrating on the other end side. The rotation speed of the rotary container 2 is 0.1 to 3r.
It is preferably in the range of pm, and its optimum value may be determined in consideration of the strength of the aggregate to be dried.
【００３９】前記攪拌を行いつつ、コントロール装置２
５によって赤外線温度検出器２３及び赤外線水分計２４
から骨材２６表面に赤外線を照射し、骨材２６の表面温
度及び含水率を検出する。この表面温度は、５０℃〜１
５０℃の範囲にあるのが適当である。赤外線温度検出器
２３は、検出した表面温度をコントロール装置２５に出
力し、コントロール装置２５は、予め設定したプログラ
ムにしたがって灯油バーナー２１及び電熱ヒーター２２
の加熱温度の加減を制御し、常に最適な熱風を送風す
る。また、赤外線水分計２４は、検出した含水率をコン
トロール装置２５に出力し、コントロール装置２５は、
骨材２６の表面水率が試験規格の範囲内となったとき、
予め設定したプログラムにしたがって灯油バーナー２
１，電熱ヒーター２２，赤外線温度検出器２３，赤外線
水分計２４を停止させる。While performing the agitation, the control device 2
5, the infrared temperature detector 23 and the infrared moisture meter 24
The surface of the aggregate 26 is irradiated with infrared rays to detect the surface temperature and the water content of the aggregate 26. This surface temperature is 50 ° C to 1
Suitably it is in the range of 50 ° C. The infrared temperature detector 23 outputs the detected surface temperature to the control device 25, and the control device 25 controls the kerosene burner 21 and the electric heater 22 according to a preset program.
Controls the heating temperature of, and always sends the optimum hot air. Further, the infrared moisture meter 24 outputs the detected water content to the control device 25, and the control device 25
When the surface water rate of the aggregate 26 falls within the range of the test standard,
Kerosene burner 2 according to a preset program
1, the electric heater 22, the infrared temperature detector 23, and the infrared moisture meter 24 are stopped.
【００４０】この場合、灯油バーナー２１は、通常の灯
油を燃焼させて加熱温度を得るため、大きい加熱温度に
よって回転容器２を十分に加温することができる。ま
た、電熱ヒーター２２は、骨材２６の乾燥によって生じ
る湿気を排除しつつ、空洞部２ａに向けて送風する熱風
に不純物を含んでいないので、空洞部２ａ内の骨材２６
を汚染することがない。In this case, since the kerosene burner 21 burns ordinary kerosene to obtain the heating temperature, the rotating container 2 can be sufficiently heated by the large heating temperature. Further, since the electric heater 22 excludes the moisture generated by the drying of the aggregate 26 and does not contain impurities in the hot air blown toward the cavity 2a, the aggregate 26 in the cavity 2a is
Never pollute.
【００４１】この後、回転容器２を前記と逆方向に回転
させつつ電動ホイスト１６を起動させ、ワイヤ１８の引
張によって回転容器２を図２に示す下の限界位置まで旋
回させる。このとき、攪拌羽根４によって、空洞部２ａ
の骨材２６は徐々に開口部２ｂ側へ移動し、排出用シュ
ート２０へと排出される。そして、空洞部２ａの骨材２
６が全て排出したら、電動ホイスト１６によってワイヤ
１８の引張を解除し、回転容器２を上の限界位置まで旋
回させた後、再び上記と同様の操作を繰り返して行う。After that, the electric hoist 16 is started while rotating the rotary container 2 in the opposite direction to the above, and the wire 18 is pulled to rotate the rotary container 2 to the lower limit position shown in FIG. At this time, by the stirring blade 4, the cavity 2a
The aggregate 26 gradually moves toward the opening 2b and is discharged to the discharging chute 20. Then, the aggregate 2 of the hollow portion 2a
When all 6 have been discharged, the electric hoist 16 releases the tension of the wire 18, the rotary container 2 is swung to the upper limit position, and the same operation as described above is repeated again.
【００４２】このように、減速機付電動機８によって回
転容器２を回転させつつ空洞部２ａへ骨材２６を投入
し、攪拌羽根４による攪拌によって骨材２６の攪拌を行
うとともに、赤外線温度検出器２３によって骨材の表面
温度を検出して灯油バーナー２１及び電熱ヒーター２２
の加熱温度をコントロール装置２５で的確に制御するこ
とで、人為的作業を必要最低限に抑制し、均質で信頼度
の高い骨材を短時間で得ることができ、さらに過剰送風
による骨材２６の熱的変形を防止できる。In this way, while the rotating container 2 is being rotated by the electric motor 8 with a speed reducer, the aggregate 26 is put into the cavity 2a, and the aggregate 26 is agitated by the agitation blade 4, and the infrared temperature detector is also provided. The surface temperature of the aggregate is detected by 23 to detect the kerosene burner 21 and the electric heater 22.
By accurately controlling the heating temperature of the control device 25 by the control device 25, it is possible to suppress the artificial work to a necessary minimum and obtain a uniform and highly reliable aggregate in a short time. Can be prevented from being thermally deformed.
【００４３】また、空洞部２ａと攪拌羽根４との間に、
空隙５を設けたことで、骨材２６が空洞部２ａ及び攪拌
羽根４に付着するのを防ぐことができ、さらに、回転容
器２を上下方向に旋回可能としたことで、骨材２６の投
入及び排出を容易に行うことができる。加えて、赤外線
水分計２４による骨材２６の表面水率の検出によって熱
風の送風を停止させることで、骨材２６の過剰乾燥を防
ぐことができる。Between the cavity 2a and the stirring blade 4,
By providing the void 5, it is possible to prevent the aggregate 26 from adhering to the cavity 2a and the stirring blades 4, and further, since the rotary container 2 can be swung in the vertical direction, the loading of the aggregate 26 can be performed. And the discharge can be easily performed. In addition, by stopping the blowing of hot air by detecting the surface water content of the aggregate 26 by the infrared moisture meter 24, excessive drying of the aggregate 26 can be prevented.
【００４４】（第二実施例）一方、図５ないし図９に
は、本発明に係る第二実施例を示している。この例は、
特に圧縮強度が１０００〜３０００kg／cm2 以上に達す
る超高強度コンクリート，ならびにコンクリートに特殊
な流動化剤を添加することにより、打設後バイブレータ
等による締固めを必要としない超流動化コンクリートに
供する骨材の乾燥に適用して極めて好適な乾燥装置であ
る。なお、このような乾燥装置は、以下に述べる回転容
器３１の内部の構成以外は、上述した乾燥装置１と同一
であるため、この例においては回転容器３１のみを詳細
に説明し、他の構成要素についてはその説明を省略す
る。(Second Embodiment) On the other hand, FIGS. 5 to 9 show a second embodiment according to the present invention. This example
In particular, it provides ultra-high-strength concrete with a compressive strength of 1000 to 3000 kg / cm 2 or more, and super-fluidized concrete that does not require compaction with a vibrator after placing by adding a special fluidizing agent to the concrete. It is a very suitable drying device applied to the drying of aggregate. Since such a drying device is the same as the above-described drying device 1 except for the internal configuration of the rotary container 31 described below, only the rotary container 31 will be described in detail in this example, and other configurations will be described. Description of elements is omitted.
【００４５】図５は、回転容器３１の軸心に沿う断面
図，図６は回転容器３１のＹ−Ｙ線で切ったときの端面
図，図７は回転容器３１を部分的に展開した説明図であ
る。これらの図を参照すると、回転容器３１は、円柱体
の内部に空洞部３１ａを形成し、一端側を閉塞端面３１
ｂとしかつ他端側を空洞部３１ａと連通する開口部３１
ｃとしたものであり、実質的に前記回転容器２と同一構
成である。この回転容器３１の内部には、板状体であっ
て、前記閉塞端面３１ｂから開口部３１ｃに向けて下方
に傾斜させた攪拌羽根３２が、回転容器３１の周方向に
等間隔で複数（この例では９個）固着されており、攪拌
羽根３２は、その長手方向略中央で分断されている。な
お、前記攪拌羽根３２に傾斜方向は、換言すれば攪拌羽
根３２の開口部３１ｃ側の端部が、閉塞端面３１ｂ側の
端部より回転容器３１の回転方向（図７の矢印Ｚ方向）
先側に位置するように傾斜したものである。FIG. 5 is a sectional view taken along the axis of the rotary container 31, FIG. 6 is an end view of the rotary container 31 taken along the line Y-Y, and FIG. 7 is a partially expanded view of the rotary container 31. It is a figure. Referring to these drawings, the rotary container 31 has a hollow portion 31a formed inside a cylindrical body, and one end side is closed at the closed end surface 31.
b, and the opening 31 communicating the other end with the cavity 31a
c and has substantially the same configuration as the rotary container 2. Inside the rotary container 31, a plurality of agitating blades 32, which are plate-like members and are inclined downward from the closed end surface 31b toward the opening 31c, are arranged at equal intervals in the circumferential direction of the rotary container 31. The number of the stirring blades 32 is fixed, and the stirring blade 32 is divided at the approximate center in the longitudinal direction. The inclination direction of the stirring blade 32, in other words, the end of the stirring blade 32 on the opening 31c side is the rotation direction of the rotary container 31 from the end on the closed end surface 31b side (arrow Z direction in FIG. 7).
It is inclined so that it is located on the front side.
【００４６】前記九個の攪拌羽根３２のうち、二個の攪
拌羽根３２を挟んで位置する合計３個の攪拌羽根３２
は、分断されて前記閉塞端面３１ｂ側に位置する羽根
が、開口部３１ｃ側に位置する羽根の傾斜方向と反対方
向にかつこの羽根の傾斜より急な角度で傾斜した戻し羽
根３３となっている。戻し羽根３２は、図５に示すよう
に、攪拌羽根３２の幅より大きい幅に形成され、具体的
には、後述する骨材の攪拌時に、この骨材の積み重なる
高さ以上に形成されている。一方、回転容器３１の開口
部３１ｃ側近くには、前記攪拌羽根３２の傾斜方向と同
一方向にかつこの羽根の傾斜より急な角度で傾斜したこ
ぼれ防止羽根３４が、各攪拌羽根３２の間で回転容器３
１の周方向に等間隔で固着されている。なお、これら各
羽根３２，３３，３４は、取付部材３６によって、回転
容器３１内面との間に隙間を設けず固着されている。Of the nine stirring blades 32, a total of three stirring blades 32 are located with two stirring blades 32 sandwiched therebetween.
Is a return blade 33 that is divided and the blade located on the closed end face 31b side is inclined in a direction opposite to the inclination direction of the blade located on the opening 31c side and at a steeper angle than the inclination of the blade. . As shown in FIG. 5, the return blade 32 is formed to have a width larger than the width of the stirring blade 32, and specifically, is formed to have a height equal to or higher than a height at which the aggregate is stacked when the aggregate is stirred as described later. . On the other hand, near the opening 31 c side of the rotary container 31, spill prevention blades 34 inclined in the same direction as the inclination direction of the stirring blades 32 and at a steeper angle than the inclination of the blades are provided between the stirring blades 32. Rotating container 3
1 are fixed at equal intervals in the circumferential direction. The blades 32, 33, 34 are fixed to each other by a mounting member 36 with no space provided between them and the inner surface of the rotary container 31.
【００４７】さらに、各攪拌羽根３２の間には、これら
攪拌羽根３２と平行に粒状化防止鋼棒（粒状化防止突
条）３５が、各攪拌羽根３２の間に一本〜三本の割合
（図６参照）で適宜固着されている。この粒状化防止鋼
棒３５は、図７に示すように、回転容器３１の閉塞端面
３１ｂ近くから開口部３１ｃ近くまで延びるものと、戻
し羽根３３の固着位置にあたるため他の粒状化防止鋼棒
３５より短く形成したものがある。粒状化防止鋼棒３５
は、鋼製の棒状体であるが、鋼棒以外のものでも突条を
なすものであればよい。Further, between the stirring blades 32, granulation preventing steel rods (granulation preventing protrusions) 35 are provided in parallel with the stirring blades 32, and one to three ratios are provided between the stirring blades 32. (See FIG. 6). As shown in FIG. 7, this anti-granulation steel rod 35 extends from near the closed end surface 31b of the rotary container 31 to near the opening 31c, and because it hits the return vane 33 at the fixed position, the other anti-granulation steel rod 35. Some have been made shorter. Granulation prevention steel rod 35
Is a steel rod-shaped body, but any material other than a steel rod may be used as long as it forms a ridge.
【００４８】次に、上記のような回転容器３１を備えた
乾燥装置を用いて、特に前記超高強度コンクリートある
いは超流動化コンクリートに供される骨材を乾燥する方
法について説明する。この場合は、水洗処理を施した骨
材を回転容器３１に投入し、減速機付電動機８によって
回転容器３１を回転させて攪拌を行いつつ、コントロー
ル装置２５によって適宜加温する工程までは上記した第
一実施例と同様に行うが、特に、回転容器３１の回転
は、約０．３rpm 〜約５rpm の範囲内で行うようにす
る。つまり、乾燥すべき骨材が、泥分を多く含んでいる
かもしくは物理的変化を生じやすいものであるときは、
０．３rpm 前後で回転させ、またこれらに該当しないも
のであるときは、５rpm 前後で回転させるようにする。Next, a method for drying the aggregate used for the super-high-strength concrete or super-fluidized concrete by using the drying apparatus equipped with the rotary container 31 as described above will be explained. In this case, the steps described above are performed until the step of heating the aggregate that has been washed with water into the rotary container 31 and rotating the rotary container 31 by the electric motor 8 with a speed reducer while stirring and appropriately heating by the control device 25. The procedure is the same as in the first embodiment, but in particular, the rotation of the rotary container 31 is performed within the range of about 0.3 rpm to about 5 rpm. In other words, when the aggregate to be dried contains a large amount of mud or is likely to undergo physical changes,
Rotate at around 0.3 rpm, and if not applicable, rotate at around 5 rpm.
【００４９】ここで、回転容器３１を０．３rpm 前後の
超低速で回転させると、回転容器３１に投入した骨材に
攪拌羽根３２及び戻し羽根３３が埋没し、このまま一体
となって回転する可能性があり、この状態では回転容器
３１内で骨材は殆ど移動しないから、良好な攪拌が行わ
れないのは明白である。しかしながら、戻し羽根３３
は、上記したように骨材の積み重なる高さ以上の幅に形
成しているので、回転容器３１の回転速度が超低速であ
っても良好な攪拌がなされる。Here, when the rotary container 31 is rotated at an ultra-low speed of about 0.3 rpm, the agitation blade 32 and the return blade 33 are buried in the aggregate put into the rotary container 31, so that the aggregate container can rotate as it is. Since the aggregate hardly moves in the rotary container 31 in this state, it is obvious that good stirring is not performed. However, the return vane 33
As described above, since the width is formed to be equal to or more than the height at which the aggregates are stacked, good stirring is performed even when the rotation speed of the rotary container 31 is extremely low.
【００５０】また、回転容器３１の回転に連れて、内部
の骨材は閉塞端面３１ｂ側へと移動するが、この骨材
は、戻し羽根３３の前記回転方向先側の面に当接し、回
転容器３１の開口部３１ｃ側へと戻される一方、回転容
器３１の開口部３１ｃ側に移動して外側にこぼれつつあ
る骨材は、こぼれ防止羽根３４の前記回転方向先側の面
に当接し、回転容器３１の閉塞端面３１ｂ側へと戻され
る。これによって、骨材は、回転容器３１内に常に均等
に散らばった状態で攪拌されるので、局所的に乾燥が進
んだり、逆に乾燥が遅れることがなく、骨材の含水率の
分散を極めて小さくすることができる。さらに、この攪
拌時には、回転容器３１を約０．３rpm で回転させ、骨
材が粒状化防止鋼棒３５と当接しつつ行われるので、骨
材に含有されている微粒分が骨材に付着することがな
く、粒状化現象も防止される。Further, as the rotary container 31 rotates, the internal aggregate moves toward the closed end face 31b side, but this aggregate comes into contact with the surface of the return vane 33 on the front side in the rotational direction to rotate. While being returned to the opening 31c side of the container 31, the aggregate moving toward the opening 31c side of the rotating container 31 and spilling to the outside comes into contact with the surface of the spill prevention blade 34 on the front side in the rotation direction, The rotary container 31 is returned to the closed end surface 31b side. As a result, the aggregate is always agitated in the rotating container 31 in a state of being evenly dispersed, so that the drying does not locally progress or conversely the drying does not delay, and the dispersion of the moisture content of the aggregate is extremely reduced. Can be made smaller. Further, at the time of this stirring, the rotary container 31 is rotated at about 0.3 rpm so that the aggregate is brought into contact with the granulation preventing steel rod 35, so that the fine particles contained in the aggregate adhere to the aggregate. And the granulation phenomenon is prevented.
【００５１】このように攪拌を続け、骨材の表面水率が
約１％〜２％に達したら、コントロール装置２５によっ
て灯油バーナー２１及び電熱ヒーター２２を停止すると
ともに、減速機付電動機８を停止させて一旦回転容器３
１の回転を停止させる。この後、回転容器３１の外側か
ら外気を送風して、回転容器３１内に滞留している骨材
を間接的に外気温度近くまで冷却させる。この外気の送
風は、灯油バーナー２１及び電熱ヒーター２２に通常内
蔵されている機器冷却装置によって行うとよいが、送風
装置を新たに設けて行ってもよい。外気の送風によって
大体外気温度まで骨材を冷却した後は、コントロール装
置２５によって再び減速機付電動機８を駆動させ、回転
容器３１を回転させる。このときの回転容器３１は、約
５rpm 〜約２０rpm の範囲内で、約２分〜約３分程度回
転させる。When stirring is continued in this way and the surface water content of the aggregate reaches approximately 1% to 2%, the kerosene burner 21 and the electric heater 22 are stopped by the control device 25, and the electric motor 8 with a reducer is stopped. Let's temporarily turn the container 3
Stop the rotation of 1. Thereafter, the outside air is blown from the outside of the rotary container 31 to indirectly cool the aggregate accumulated in the rotary container 31 to a temperature close to the outside air. The blowing of the outside air may be performed by a device cooling device that is usually built in the kerosene burner 21 and the electric heater 22, but a blowing device may be newly provided. After cooling the aggregate to about the outside air temperature by blowing the outside air, the control device 25 drives the electric motor 8 with a speed reducer again to rotate the rotary container 31. At this time, the rotary container 31 is rotated within a range of about 5 rpm to about 20 rpm for about 2 minutes to about 3 minutes.
【００５２】このような骨材の乾燥方法を纏めたものが
図８である。この図は、乾燥時間に対する乾燥装置の作
動状態（図において上側のタイムチャート）と、乾燥時
間に対する骨材の乾燥温度及び含水率の変化（図におい
て下側のグラフ）を示すものである。すなわち、回転容
器３１外側へ熱風を供給しつつ（チャートＡがＯＮ）、
回転容器３１を約０．３rpm 前後で回転させると（チャ
ートＣがＯＮ１）、骨材の温度（グラフＡ）が上昇する
に連れて含水率（グラフＢ）が低下してくのがわかる。
回転容器３１を回転させてから約６０分経過した後は、
熱風の供給を停止し（チャートＡがＯＦＦ）、回転容器
３１を約１５rpm で回転させる（チャートＣがＯＮ
２）。この際の回転時間は、上述したように約２分〜約
３分程度であって、これによって仕上げの攪拌、すなわ
ち骨材の含水率を均質化させるための攪拌がなされる。FIG. 8 shows a summary of the drying method of such an aggregate. This figure shows the operating state of the drying device with respect to the drying time (upper time chart in the figure), and changes in the drying temperature and water content of the aggregate with respect to the drying time (lower graph in the figure). That is, while supplying hot air to the outside of the rotary container 31 (chart A is ON),
It can be seen that when the rotary container 31 is rotated at about 0.3 rpm (chart C is ON1), the water content (graph B) decreases as the temperature of the aggregate (graph A) rises.
After about 60 minutes have passed since the rotary container 31 was rotated,
The supply of hot air is stopped (chart A is OFF), and the rotary container 31 is rotated at about 15 rpm (chart C is ON.
2). The rotation time at this time is about 2 minutes to about 3 minutes as described above, whereby the finishing stirring, that is, the stirring for homogenizing the water content of the aggregate is performed.
【００５３】一方、図９は、攪拌を終了した後の骨材に
おいて、回転容器３１の閉塞端面３１ｂ側にある骨材と
開口部３１ｃ側にある骨材との含水率の差と、攪拌時間
及び総攪拌数との関係を示しており、上記骨材の含水率
を均質化させるための攪拌時間を約２分〜約３分とした
ことを裏付けるものである。すなわち、グラフａは、第
一実施例で説明した装置と方法によって、５０°Ｃ〜６
０°Ｃの骨材を１８rpm で回転した回転容器２で乾燥を
行った場合，グラフｂは、第二実施例で説明した装置を
用い、冷却工程を加えない方法によって、５０°Ｃ〜６
０°Ｃの骨材を１８rpm で回転した回転容器３１で乾燥
を行った場合，グラフｃは、第二実施例で説明した装置
と方法によって、外気温度（約２０°Ｃ）の骨材を１８
rpm で回転した回転容器３１で乾燥を行った場合，グラ
フｄは、超高強度コンクリートに供する骨材に要求され
る含水率の差の目標値を示している。この図から明らか
なように、グラフｃは、攪拌時間が約１分〜約４分まで
の間にグラフｄを越えており、したがって前記目標値を
確実に達成できていることがわかる。一方、グラフａ及
びグラフｂは、目標値には達しておらず、特に超高強度
コンクリート等の特殊なコンクリートに供する骨材は、
第二実施例で説明した装置と方法によって乾燥させるの
が極めて好適である。このことから、骨材の含水率を均
質化させるための最後の攪拌は、約２分〜約３分が最適
であると結論できる。On the other hand, FIG. 9 shows the difference in water content between the aggregate on the closed end face 31b side of the rotary container 31 and the aggregate on the opening 31c side of the aggregate after the stirring and the stirring time. And the relationship with the total number of agitations, which proves that the agitation time for homogenizing the water content of the aggregate is about 2 minutes to about 3 minutes. That is, the graph a is 50 ° C. to 6 ° C. by the device and method described in the first embodiment.
When drying the 0 ° C aggregate in the rotary container 2 rotated at 18 rpm, the graph b shows 50 ° C to 6 ° C by using the apparatus described in the second embodiment and not adding the cooling step.
When the aggregate of 0 ° C is dried in the rotary container 31 rotated at 18 rpm, the graph c shows that the aggregate of the outside air temperature (about 20 ° C) is 18 by the apparatus and method described in the second embodiment.
When drying is performed in the rotary container 31 rotated at rpm, the graph d shows the target value of the difference in water content required for the aggregate used for the ultra-high strength concrete. As is clear from this figure, the graph c exceeds the graph d during the stirring time of about 1 minute to about 4 minutes, and therefore it can be seen that the target value can be reliably achieved. On the other hand, the graphs a and b do not reach the target value, and the aggregate used for special concrete such as super high strength concrete is
Drying with the apparatus and method described in the second embodiment is very suitable. From this, it can be concluded that the final stirring for homogenizing the water content of the aggregate is optimally about 2 minutes to about 3 minutes.
【００５４】[0054]
【発明の効果】以上の説明から明らかなように、本発明
のコンクリート用骨材の乾燥方法及びその装置によれ
ば、以下の効果を得ることができる。請求項１に記載の
ものによれば、回転容器内に骨材を投入した後、この回
転容器を所定速度で所定時間回転させつつ回転容器内外
へ熱風を送風し、加えて回転容器内の骨材の表面温度に
応じて熱風の温度を加減することで、骨材の乾燥を機械
的に行うことができ、したがって人為的作業を必要最小
限に抑制し、均質な骨材を短時間で効率的に得ることが
できる。また、常に的確な温度の熱風を送風すること
で、乾燥の効率化を促進し、骨材の熱的変形を防止する
ことができる。As is clear from the above description, the following effects can be obtained by the method and apparatus for drying concrete aggregate according to the present invention. According to the first aspect of the present invention, after the aggregate is put into the rotary container, the rotary container is rotated at a predetermined speed for a predetermined time and hot air is blown into and out of the rotary container. By adjusting the temperature of hot air according to the surface temperature of the aggregate, the drying of the aggregate can be performed mechanically, thus suppressing the manual work to the minimum necessary and making homogeneous aggregate efficient in a short time. You can get it. Further, by constantly blowing hot air having an appropriate temperature, it is possible to promote the efficiency of drying and prevent thermal deformation of the aggregate.
【００５５】請求項２に記載のものによれば、回転容器
を所定速度で所定時間回転させつつ回転容器内外へ熱風
を送風して前記回転容器を加温した後、骨材をこの回転
容器内に投入することで、回転容器が加温されるまでの
間に起こり得る、各々の骨材あるいは骨材と攪拌羽根と
の衝突等による骨材の物理的変形を防止するとともに回
転容器へ骨材が付着するのを防止し、したがって信頼度
の高い骨材を得ることができる。According to the second aspect, while rotating the rotary container at a predetermined speed for a predetermined time, hot air is blown into and out of the rotary container to heat the rotary container, and then the aggregate is placed in the rotary container. In order to prevent the physical deformation of the aggregate due to the collision between each aggregate or the aggregate and the stirring blade, which may occur before the rotary container is heated, Can be prevented from adhering, and thus a highly reliable aggregate can be obtained.
【００５６】請求項３に記載のものによれば、乾燥の際
に加温された骨材は、停止した回転容器内で一旦冷却さ
れるから、骨材の余剰な乾燥が防止でき、さらに、骨材
を冷却した後再び攪拌することによって、骨材の表面水
率を一層均質にすることができる。請求項４に記載のも
のによれば、回転容器の回転による攪拌と、熱風装置か
らの熱風の送風との機械的作業によって骨材を乾燥させ
ることができ、したがって人為的作業を抑制し、均質な
骨材を短時間で効率的に得ることができる。According to the third aspect of the present invention, since the aggregate heated during the drying is once cooled in the stopped rotating container, excessive drying of the aggregate can be prevented, and further, By cooling the aggregate and then stirring again, the surface water content of the aggregate can be made more uniform. According to the fourth aspect, the aggregate can be dried by the mechanical work of the stirring by the rotation of the rotary container and the blowing of the hot air from the hot air device, thus suppressing the artificial work and homogeneous. It is possible to efficiently obtain various aggregates in a short time.
【００５７】請求項５に記載のものによれば、回転容器
内部の攪拌羽根を、回転容器の延在方向に沿って傾斜さ
せて設けたことで、骨材の排出を容易にすることができ
るとともに、攪拌羽根と回転容器内周面との間にスリッ
トを設けたことで、攪拌羽根及び回転容器内に骨材が付
着するのを防止することができる。請求項６に記載のも
のによれば、回転容器内に投入された後に閉塞端面側に
集まった骨材は、回転容器の回転に伴い、戻し羽根の前
記回転方向先側の面に当接し、回転容器の開口端面側へ
と戻されることになり、したがって、骨材を均質に攪拌
することができるとともに、攪拌の効率を向上させるこ
とができる。According to the fifth aspect of the present invention, the stirring blade inside the rotary container is provided so as to be inclined along the extending direction of the rotary container, so that the aggregate can be easily discharged. In addition, since the slit is provided between the stirring blade and the inner circumferential surface of the rotary container, it is possible to prevent the aggregate from adhering to the stirring blade and the rotary container. According to the sixth aspect, the aggregate gathered on the closed end face side after being put into the rotary container comes into contact with the surface of the return blade on the front side in the rotation direction, as the rotary container rotates, Since the aggregate is returned to the opening end face side of the rotary container, the aggregate can be uniformly stirred and the stirring efficiency can be improved.
【００５８】請求項７に記載のものによれば、戻し羽根
を、前記回転容器の回転時に、この回転容器内部に投入
した骨材の積み重なる高さ以上の大きさに形成したこと
で、戻し羽根と骨材とが一体となって回転することがな
く、回転容器を低速度で回転させた場合にも、良好な攪
拌を行うことができる。請求項８に記載のものによれ
ば、回転容器の回転に伴いこの回転容器の開口端面に集
まり、回転容器の外側にこぼれつつある骨材が、こぼれ
防止羽根の前記回転方向先側の面に当接し、回転容器の
閉塞端面側へと戻されることになり、したがって、骨材
のこぼれ落ちが防止でき、骨材を均質に攪拌することが
できるとともに、攪拌の効率を向上させることができ
る。According to the seventh aspect of the present invention, the return vane is formed to have a size larger than the stacking height of the aggregates charged in the rotary container when the rotary container is rotated. It is possible to perform good stirring even when the rotary container is rotated at a low speed, because the aggregate and the aggregate do not rotate together. According to the eighth aspect, aggregates gathering on the opening end surface of the rotary container as the rotary container rotates and spilling to the outside of the rotary container are formed on the front surface of the spill preventing blade in the rotation direction. It comes into contact and is returned to the closed end face side of the rotary container, and therefore, the aggregate can be prevented from spilling down, the aggregate can be stirred uniformly, and the stirring efficiency can be improved.
【００５９】請求項９に記載のものによれば、前記回転
容器の内部に、この回転容器の内面に沿って一端側近く
から他端側近くまで延びる複数の粒状化防止突条を設け
たことで、この粒状化防止突条を備えた回転容器を約
０．１rpm 〜約５rpm 未満の範囲で回転させて攪拌を行
うと、回転容器の回転に伴い、骨材が前記粒状化防止突
条に当接し、粒状化現象を略確実に防止できる。特に、
回転容器を超低速度（約１rpm 以下）で回転させると、
粒状化現象を完全に防止することができる。According to a ninth aspect of the present invention, a plurality of granulation preventing ridges extending from near one end side to near the other end side along the inner surface of the rotary container are provided inside the rotary container. Then, when the rotating container provided with the granulation preventing ridges is rotated in a range of about 0.1 rpm to less than about 5 rpm to perform stirring, the aggregate becomes the granulation preventing ridges as the rotating container rotates. It is possible to make contact with each other and almost certainly prevent the granulation phenomenon. In particular,
When the rotating container is rotated at an extremely low speed (about 1 rpm or less),
The granulation phenomenon can be completely prevented.
【００６０】請求項１０に記載のものによれば、回転容
器を上下方向に旋回可能としたことで、回転容器内への
骨材の投入及び回転容器内にある骨材の外部への取り出
しを容易に行うことができる。請求項１１に記載のもの
によれば、赤外線水分計が回転容器内の骨材表面の水分
を検出し、この赤外線水分計の検出出力に基づいて、コ
ントロール装置が前記回転容器の回転及び熱風装置の稼
働を停止させるので、所望の骨材を的確に得ることがで
きるとともに、回転容器及び熱風装置の余剰な運転を防
止することができる。According to the tenth aspect of the present invention, since the rotary container can be turned up and down, it is possible to insert the aggregate into the rotary container and take out the aggregate inside the rotary container to the outside. It can be done easily. According to the eleventh aspect, the infrared moisture meter detects moisture on the surface of the aggregate in the rotary container, and the control device rotates the rotary container and the hot air device based on the detection output of the infrared moisture meter. Since the operation of No. 1 is stopped, the desired aggregate can be accurately obtained, and excessive operation of the rotary container and the hot air device can be prevented.
【００６１】請求項１２に記載のものによれば、回転容
器外周に灯油バーナーで熱風を送風することで、大きい
加熱温度を安価に得ることができ、したがって、乾燥効
率を向上させることができるとともに、作業コストを引
き上げることがない。また、回転容器内部に電熱ヒータ
ーで熱風を送風することで、骨材の乾燥を促進させ、乾
燥の際に生じる湿気を好適に排除することができるとと
もに、送風によって骨材表面を汚染することがない。According to the twelfth aspect of the present invention, a large heating temperature can be obtained at low cost by blowing hot air to the outer circumference of the rotary container with a kerosene burner, and therefore, the drying efficiency can be improved. , Does not raise the working cost. Further, by blowing hot air with an electric heater inside the rotary container, it is possible to accelerate the drying of the aggregate, and it is possible to suitably eliminate the moisture generated during the drying, and it is possible to contaminate the aggregate surface by the blowing. Absent.
【００６２】これらの効果から、骨材の試験に係る作業
コストの削減を実現できるとともに、試験期間を短縮す
ることができ、さらに多様な種類のコンクリートに対応
して骨材を的確に乾燥させることができる。From these effects, it is possible to reduce the working cost for the test of the aggregate, to shorten the test period, and to dry the aggregate appropriately for various kinds of concrete. You can
【図１】第一実施例で説明した乾燥装置による骨材の攪
拌時の状態を示す構成断面図である。FIG. 1 is a structural cross-sectional view showing a state when an aggregate is stirred by a drying device described in the first embodiment.
【図２】同骨材の排出時の状態示す構成断面図である。FIG. 2 is a structural cross-sectional view showing a state at the time of discharging the aggregate.
【図３】図２におけるＸ−Ｘ線断面図である。FIG. 3 is a sectional view taken along line XX in FIG.
【図４】第一実施例で説明した乾燥装置の制御状態の構
成を示す概念図である。FIG. 4 is a conceptual diagram showing a configuration of a control state of the drying device described in the first embodiment.
【図５】第二実施例で説明した乾燥装置の回転容器の構
成を示す断面図である。FIG. 5 is a cross-sectional view showing a configuration of a rotary container of the drying device described in the second embodiment.
【図６】図５においてＹ−Ｙ線で切ったときの回転容器
の端面図である。6 is an end view of the rotary container taken along line YY in FIG.
【図７】図５に示した回転容器を部分的に展開した説明
図である。FIG. 7 is an explanatory diagram in which the rotary container shown in FIG. 5 is partially developed.
【図８】第二実施例で説明した乾燥時間に対する乾燥装
置の作動状態を示すタイムチャート、及び乾燥時間に対
する骨材の乾燥温度及び含水率の変化を示すグラフであ
る。FIG. 8 is a time chart showing the operating state of the drying device with respect to the drying time described in the second example, and a graph showing changes in the drying temperature and water content of the aggregate with respect to the drying time.
【図９】第二実施例で説明した回転容器の閉塞端面側に
ある骨材と開口部側にある骨材との含水率の差と、攪拌
時間及び総攪拌数との関係を示すグラフである。FIG. 9 is a graph showing the relationship between the difference in water content between the aggregate on the closed end surface side of the rotary container and the aggregate on the opening side, and the stirring time and the total number of stirrings described in the second embodiment. is there.
１ 乾燥装置 ２，３１ 回転容器 ４，３２ 攪拌羽根 ５ 空隙（スリット） ８ 減速機付電動機（駆動源） ２１ 灯油バーナー（熱風装置） ２２ 電熱ヒーター（熱風装置） ２３ 赤外線温度検出器（温度検出器） ２４ 赤外線水分計 ２５ コントロール装置 ２６ 骨材 ３１ｂ 閉塞端面 ３１ｃ 開口部 ３３ 戻し羽根 ３４ こぼれ防止羽根 ３５ 粒状化防止鋼棒（粒状化防止突条） 1 Drying Device 2,31 Rotating Container 4,32 Stirring Blade 5 Void (Slit) 8 Motor with Reduction Gear (Drive Source) 21 Kerosene Burner (Hot Air Device) 22 Electric Heater (Hot Air Device) 23 Infrared Temperature Detector (Temperature Detector) ) 24 infrared moisture meter 25 control device 26 aggregate 31b closed end face 31c opening 33 return blade 34 spill prevention blade 35 anti-granulation steel bar (granulation-prevention bar)
Claims (12)
ンクリート用骨材を投入し、前記回転容器を所定速度で
所定時間回転させつつ前記回転容器内外に熱風を送風
し、加えて前記骨材の表面温度に基づいて前記熱風の温
度を加減することを特徴とするコンクリート用骨材の乾
燥方法。1. An aggregate for concrete is put into a rotary container having stirring blades therein, and while the rotary container is rotated at a predetermined speed for a predetermined time, hot air is blown into and out of the rotary container, and in addition, the aggregate is added. A method for drying concrete aggregate, characterized in that the temperature of the hot air is adjusted based on the surface temperature of the aggregate.
つつ前記回転容器内外へ熱風を送風して前記回転容器を
加温した後、前記回転容器内に骨材を投入し、さらに前
記回転容器を所定速度で所定時間回転させつつ前記回転
容器内外に熱風を送風し、加えて前記骨材の表面温度に
基づいて前記熱風の温度を加減することを特徴とする請
求項１に記載のコンクリート用骨材の乾燥方法。2. A rotary container is rotated at a predetermined speed for a predetermined time, hot air is blown into and out of the rotary container to heat the rotary container, and then an aggregate is put into the rotary container, and the rotary container is further rotated. The hot air is blown into and out of the rotary container while rotating at a predetermined speed for a predetermined time, and in addition, the temperature of the hot air is adjusted based on the surface temperature of the aggregate. How to dry aggregate.
を加減して前記骨材の表面水率が所定値に低減した後、
この熱風の送風を停止するとともに前記回転容器の回転
を停止し、次いでこの骨材を外気温度近くまで冷却した
後、再び前記回転容器を所定速度で所定時間回転させる
ことを特徴とする請求項１又は請求項２に記載のコンク
リート用骨材の乾燥方法。3. After the temperature of the hot air is adjusted based on the surface temperature of the aggregate to reduce the surface water ratio of the aggregate to a predetermined value,
2. The method according to claim 1, wherein the blowing of the hot air is stopped, the rotation of the rotary container is stopped, the aggregate is cooled to a temperature close to the outside air, and then the rotary container is again rotated at a predetermined speed for a predetermined time. Alternatively, the method for drying concrete aggregate according to claim 2.
コンクリート用骨材の乾燥装置であって、内部に攪拌羽
根を有する回転容器と、前記回転容器を所定速度で所定
時間回転させる駆動源と、前記回転容器内外に熱風を送
風する熱風装置と、前記回転容器内に投入された骨材の
表面温度を検出する温度検出器と、前記温度検出器の検
出出力に基づいて前記熱風装置の加熱温度を自動的に制
御するコントロール装置と、から構成したことを特徴と
するコンクリート用骨材の乾燥装置。4. A concrete aggregate drying apparatus for drying aggregate used for concrete, comprising: a rotating container having stirring blades therein; a drive source for rotating the rotating container at a predetermined speed for a predetermined time; A hot air device for blowing hot air into and out of the rotary container, a temperature detector for detecting the surface temperature of the aggregate put in the rotary container, and a heating temperature of the hot air device based on the detection output of the temperature detector. A drying device for concrete aggregate, which is characterized by being configured with a control device which is automatically controlled.
内周面近くで回転容器の長手方向に沿いかつ軸線に対し
てねじれの位置とし、さらに前記攪拌羽根と前記回転容
器内周面との間にスリットを設けたことを特徴とする請
求項４に記載のコンクリート用骨材の乾燥装置。5. The position of the stirring blade is near the inner peripheral surface of the rotary container along the longitudinal direction of the rotary container and twisted with respect to the axis, and further, the stirring blade and the inner peripheral surface of the rotary container. The drying device for concrete aggregate according to claim 4, wherein a slit is provided between the slits.
端面とした前記回転容器の内部に、前記開口端面に近い
側の端部が前記閉塞端面に近い側の端部より前記回転容
器の回転方向先側に位置した攪拌羽根を設けるととも
に、前記回転容器の前記閉塞端面側の内部に、前記閉塞
端面に近い側の端部が前記閉塞端面から遠い側の端部よ
り前記回転方向先側に位置した戻し羽根を設けたことを
特徴とする請求項４に記載のコンクリート用骨材の乾燥
装置。6. The rotary container, wherein one end side has a closed end face and the other end side has an open end face, and the end nearer to the open end face is closer than the end closer to the closed end face to the rotary container. In addition to providing a stirring blade located on the front side in the rotation direction of the rotating container, inside the closed end surface side of the rotating container, the end portion on the side close to the closed end surface is ahead of the end on the side far from the closed end surface in the rotation direction. The drying apparatus for concrete aggregate according to claim 4, further comprising a return vane located on the side.
に、この回転容器内部に投入した骨材の積み重なる高さ
以上の大きさに形成したことを特徴とする請求項６に記
載のコンクリート用骨材の乾燥装置。7. The concrete according to claim 6, wherein the return vane is formed to have a size equal to or larger than a stacking height of aggregates charged in the rotary container when the rotary container is rotated. Aggregate dryer.
端面とした前記回転容器の前記開口端面側の内部に、前
記開口端面に近い側の端部が前記開口端面から遠い側の
端部より前記回転容器の回転方向先側に位置したこぼれ
防止羽根を設けたことを特徴とする請求項４ないし請求
項７のいずれかに記載のコンクリート用骨材の乾燥装
置。8. The inside of the rotary container whose one end side is a closed end surface and whose other end side is an open end surface is inside the open end surface side, and an end portion close to the open end surface is an end far from the open end surface. 8. An apparatus for drying concrete aggregate according to any one of claims 4 to 7, further comprising spill-prevention blades located on the front side of the rotating container in the rotation direction.
内面に沿って一端側近くから他端側近くまで延びる複数
の粒状化防止突条を設けたことを特徴とする請求項４な
いし請求項８のいずれかに記載のコンクリート用骨材の
乾燥装置。9. A plurality of granulation preventing ridges extending inside the rotary container along the inner surface of the rotary container from near one end side to near the other end side. Item 9. A concrete aggregate drying device according to any one of items 8.
と直交する支持線を中心として上下方向に旋回可能に配
設したことを特徴とする請求項４ないし請求項９のいず
れかに記載のコンクリート用骨材の乾燥装置。10. The rotating container according to claim 4, wherein the rotating container is arranged so as to be vertically rotatable about a support line orthogonal to an axis of the rotating container. Equipment for drying aggregate for concrete.
射して前記回転容器に投入された骨材表面の水分を検出
する赤外線水分計を接続し、この赤外線水分計の検出出
力に基づいて前記回転容器の回転及び前記熱風装置の稼
働を停止させることを特徴とする請求項４ないし請求項
１０のいずれかに記載のコンクリート用骨材の乾燥装
置。11. An infrared moisture meter for irradiating infrared rays to detect moisture on the surface of an aggregate charged in the rotary container is connected to the control device, and the rotary container is detected based on a detection output of the infrared moisture meter. 11. The drying apparatus for concrete aggregate according to any one of claims 4 to 10, characterized in that the rotation of the above and the operation of the hot air device are stopped.
熱風を送風する灯油バーナーと、前記回転容器内部に熱
風を送風する電熱ヒーターと、から構成したことを特徴
とする請求項４ないし請求項１１のいずれかに記載のコ
ンクリート用骨材の乾燥装置。12. The hot air device comprises a kerosene burner for sending hot air to the outer circumference of the rotary container, and an electric heater for sending hot air to the inside of the rotary container. 11. A concrete aggregate drying device according to any one of 11 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29365993A JPH074844A (en) | 1993-04-23 | 1993-11-24 | Method and device for drying aggregate for concrete |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9785493 | 1993-04-23 | ||
| JP5-97854 | 1993-04-23 | ||
| JP29365993A JPH074844A (en) | 1993-04-23 | 1993-11-24 | Method and device for drying aggregate for concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH074844A true JPH074844A (en) | 1995-01-10 |
Family
ID=26438989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29365993A Pending JPH074844A (en) | 1993-04-23 | 1993-11-24 | Method and device for drying aggregate for concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074844A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092817A (en) * | 2016-07-29 | 2016-11-09 | 广东惠利普路桥信息工程有限公司 | A kind of bridge construction concrete moisture content monitoring device |
| JP2018194266A (en) * | 2017-05-19 | 2018-12-06 | 株式会社渡会電気土木 | Dryer |
| CN116754754A (en) * | 2023-08-08 | 2023-09-15 | 河北路诚检测技术有限公司 | Detection equipment for detecting raw materials of highway bridge |
-
1993
- 1993-11-24 JP JP29365993A patent/JPH074844A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092817A (en) * | 2016-07-29 | 2016-11-09 | 广东惠利普路桥信息工程有限公司 | A kind of bridge construction concrete moisture content monitoring device |
| JP2018194266A (en) * | 2017-05-19 | 2018-12-06 | 株式会社渡会電気土木 | Dryer |
| CN116754754A (en) * | 2023-08-08 | 2023-09-15 | 河北路诚检测技术有限公司 | Detection equipment for detecting raw materials of highway bridge |
| CN116754754B (en) * | 2023-08-08 | 2023-11-10 | 河北路诚检测技术有限公司 | Detection equipment for detecting raw materials of highway bridge |
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