JPH02249999A - Eliminating method for adhering/stagnant powder in pneumatic tube - Google Patents
Eliminating method for adhering/stagnant powder in pneumatic tubeInfo
- Publication number
- JPH02249999A JPH02249999A JP1072467A JP7246789A JPH02249999A JP H02249999 A JPH02249999 A JP H02249999A JP 1072467 A JP1072467 A JP 1072467A JP 7246789 A JP7246789 A JP 7246789A JP H02249999 A JPH02249999 A JP H02249999A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- pneumatic
- dry ice
- pneumatic tube
- adhering
- 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.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 35
- 235000011089 carbon dioxide Nutrition 0.000 claims abstract description 33
- 239000003758 nuclear fuel Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 12
- 239000010419 fine particle Substances 0.000 claims description 8
- 238000005202 decontamination Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 6
- 229910052778 Plutonium Inorganic materials 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 3
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 150000003671 uranium compounds Chemical class 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 206010073306 Exposure to radiation Diseases 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011824 nuclear material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Cleaning In General (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
Description
この発明は、空気輸送方式により粉末を移送させる気送
管の内面に付着あるいは滞留した粉末を、効果的かつ確
実に除去するための方法に関するものである。
特にこの発明は、水を用いて気送管内を洗浄する方法が
制限される分野、例えばプルトニウムやウラン化合物等
の核燃料物質粉末が気送管内に付着・滞留した場合に、
この粉末を除去、回収する除染方法等に有用である。The present invention relates to a method for effectively and reliably removing powder adhering to or staying on the inner surface of a pneumatic tube through which powder is transferred using a pneumatic transport method. In particular, this invention is useful in fields where methods of cleaning the inside of pneumatic pipes using water are restricted, for example, when nuclear fuel material powder such as plutonium or uranium compounds adheres to or accumulates inside the pneumatic pipe.
It is useful for decontamination methods to remove and recover this powder.
空気輸送方式により粉末を気送管内を通して所望箇所へ
移送する場合、気送管内面だけでなく気送のために必要
な設備、例えばサイクロンやホッパー内に粉末が付着あ
るいは滞留し、そのまま運転を続けると気送ラインの閉
塞を生じて工程が停止することもある。
特にプルトニウムやウラン化合物等の核燃料物質を取扱
う場合には、臨界管理や保障措置の観点からその量を常
に把握し、不明在庫を極力少なくする必要があり、気送
管内に付着・滞留する核燃料物質粉末を確実に除去、回
収しなくてはならない。また、使用する核燃料物質を変
更する場合にも、気送管内に残留する粉末を除去してお
かないと品質管理上問題が発生する。
気送管内に付着・滞留した粉末を除去する従来の方法と
しては、除去装置を用いて機械的に除去する方法、水ま
たはその他の液体を気送管内に流して洗浄する方法、あ
るいは砂等を圧空等により気送管内に吹込んで洗浄する
方法がある。When powder is transferred to a desired location through a pneumatic pipe using the pneumatic transport method, the powder adheres or accumulates not only on the inside of the pneumatic pipe but also in the equipment necessary for pneumatic transport, such as a cyclone or hopper, and the operation continues. This may cause blockage of the pneumatic line and stop the process. In particular, when handling nuclear fuel materials such as plutonium and uranium compounds, it is necessary to constantly monitor the amount of nuclear fuel materials from the viewpoint of criticality control and safeguards, and to minimize unknown inventory. Powder must be removed and recovered reliably. Furthermore, even when changing the nuclear fuel material used, quality control problems will occur unless the powder remaining in the pneumatic pipe is removed. Conventional methods for removing powder that has adhered or accumulated inside the pneumatic pipe include mechanical removal using a removal device, cleaning by flushing water or other liquid into the pneumatic pipe, or cleaning with sand, etc. There is a method of cleaning by blowing compressed air into the pneumatic pipe.
しかしながら、上記したような機械的除去方法は、気送
管の曲りの部分における除去が困難であったり、気送管
が長い場合には除去装置が大型化せざるを得ず、さらに
は気送のために必要な設備であるサイクロンやホッパー
内の粉末の除去ができないといった欠点がある。
また核燃料物質粉末の気送管の場合には、気送管内に付
着・滞留している粉末が核物質であるため水などの液体
による洗浄は制限され、さらに固体を吹込む方法におい
ては、その固体の回収および核燃料物質粉末との分離の
点で困難を生じる。
そこでこの発明の目的は、上述した従来技術における欠
点を解消し、気送管内に付着・滞留した粉末の除去を、
気送管の形状や長さに関係なく効果的かつ確実に行うこ
とができる方法を提供することである。
さらにこの発明の目的は、洗浄媒体として水などの液体
を用いることなく、さらには回収が困難でかつ粉末との
分離が困難な固体洗浄媒体を用いることなく、気送管内
に付着・滞留した粉末を確実に除去、回収することがで
きる方法を提供することである。
この発明のもう１つの目的は、核燃料物質粉末の気送管
内さらには気送のために必要なサイクロンやホッパー内
に付着・滞留した粉末を効果的に除去、回収して除染す
る方法を提供することである。However, with the mechanical removal method described above, it is difficult to remove curved parts of the pneumatic tube, or if the pneumatic tube is long, the removal device must be large, and furthermore, the pneumatic tube cannot be removed easily. There are drawbacks such as the inability to remove the powder in the cyclone or hopper, which is the equipment required for this purpose. In addition, in the case of pneumatic pipes containing nuclear fuel material powder, cleaning with liquids such as water is limited because the powder adhering and staying inside the pneumatic pipe is nuclear material, and furthermore, methods of injecting solids are difficult to clean. This creates difficulties in recovering the solids and separating them from the nuclear fuel material powder. Therefore, the purpose of this invention is to solve the above-mentioned drawbacks of the prior art, and to remove powder that has adhered and accumulated in the pneumatic pipe.
It is an object of the present invention to provide a method that can be carried out effectively and reliably regardless of the shape and length of the pneumatic tube. Furthermore, it is an object of the present invention to eliminate powder that has adhered or accumulated in a pneumatic pipe without using a liquid such as water as a cleaning medium, or without using a solid cleaning medium that is difficult to recover and separate from powder. The objective is to provide a method that can reliably remove and recover. Another object of the present invention is to provide a method for effectively removing, collecting, and decontaminating nuclear fuel material powder adhering to and staying in pneumatic pipes, as well as in cyclones and hoppers necessary for pneumatic transport. It is to be.
すなわちこの発明による気送管内付着・滞留粉末の除去
方法は、気送管内にドライアイス微粒子を気送すること
によって、該気送管内面に付着あるいは滞留した粉末を
除去することを特徴とするものである。That is, the method for removing powder adhering to or staying inside a pneumatic pipe according to the present invention is characterized in that powder adhering to or staying on the inner surface of the pneumatic pipe is removed by pneumatically delivering fine particles of dry ice into the pneumatic pipe. It is.
圧空等で気送管内に気送されたドライアイス微粒子は、
その衝撃力で気送管内あるいはす・イクロンやホッパー
内に付着あるいは滞留している粉末を効果的に剥離、除
去する。
ドライアイス（固体二酸化炭素）は、比重が１．５６で
硬度は低いため、これによる衝撃力を気送管内面やサイ
クロン、ホッパー等の機器類に与えても、損傷を与える
心配はない。
ドライアイス微粒子は気送管内を粉末と同様な経路を経
て移動するため、粉末が付着・滞留しやすい部分にも集
中的に作用して、そこに付着・滞留している粉末を確実
に除去することができる。
また、気送管内に単に付着・滞留しただけでなくその場
所で固化して水洗浄では除去できないような粉末でも、
ドライアイス微粒子の衝撃力により効果的に剥離、除去
できる。
除去された粉末はドライアイス微粒子と共に取出すだけ
で、ドライアイス微粒子は昇華してしまうため、ドライ
アイスと粉末とを分離する作業を行わずとも、除去した
粉末を確実に回収することができる。またドライアイス
微粒子が気送管内に残留した場合でも、ドライアイスは
その場で昇華するため不純物として気送管内に残ること
はない。Dry ice particles that are pneumatically blown into the pneumatic pipe using compressed air, etc.
The impact force effectively peels off and removes powder adhering to or staying inside the pneumatic pipe, glass, icron, or hopper. Dry ice (solid carbon dioxide) has a specific gravity of 1.56 and low hardness, so there is no risk of damage even if the impact force is applied to the inner surface of a pneumatic pipe or equipment such as a cyclone or hopper. Dry ice particles move through the pneumatic pipe through the same route as powder, so they act intensively on areas where powder tends to stick and stay, and reliably remove the powder that sticks and stays there. be able to. In addition, powder that not only adheres to and remains in the pneumatic pipe but also solidifies there and cannot be removed by washing with water can be removed.
It can be effectively peeled off and removed by the impact force of dry ice particles. Since the removed powder is simply taken out together with the dry ice fine particles and the dry ice fine particles sublimate, the removed powder can be reliably recovered without the need for separating the dry ice and the powder. Furthermore, even if dry ice particles remain in the pneumatic tube, the dry ice sublimates on the spot, so they do not remain as impurities in the pneumatic tube.
添付の図面は、一般的な核燃料物質粉末の気送管装置の
概略図である。通常の使用方法では、グローブボックス
Ａ内の粉末１を気送管２を介してグローブボックスＢ内
に設置したサイクロン３へ気送し、ここで固−気分離を
行い、固体の粉末のみホッパー４内に溜める。その後ホ
ッパー４より粉末を取出して引続く次のプロセス処理装
置（図示せず）へ移送する。気送管２を介しての粉末１
の気送は、グローブボックスＣ内に設置したブロアー５
により気送管２およびサイクロン３、ホッパー４内を負
圧にすることによりなされる。図中、番号６はサイクロ
ンに内装されたフィルターであり、番号２′は気送管の
分岐管である。この分岐管２′からは、別のグローブボ
ックス（図示せず）からの別の種類または同種の核燃料
物質粉末が気送され混合される。かような気送工程を実
施する過程で、気送管２，２′内面、サイクロン３内面
、ホッパ−４内面、フィルター６表面等に粉末が付着あ
るいは滞留する。
このような付着・滞留粉末の除去をこの発明の方法に従
って実施する場合には、粉末１に代えて単にドライアイ
ス微粒子を粉末と同様にして気送管内に気送すれば良い
。気送されたドライアイス微粒子は、粉末と同じ経路を
経て、気送管２、サイクロン３、ホッパー４、フィルタ
ー６を移送され、従って、粉末が特に付着・滞留しやす
い部分にドライアイス微粒子が気送され、効果的かつ確
実に付着・滞留粉末を除去する。
このとき使用するドライアイス微粒子の太きさは、気送
されうる寸法であればよく、一般的には直径２ ｍｍ程
度に予め調製した微粒子が好ましく使用できる。
除去された粉末は、ドライアイス微粒子との混合物とし
てホッパー４から取出したのちドライアイス微粒子のみ
を昇華させることにより、回収することができる。ある
いはまた、除去された粉末とドライアイス微粒子との混
合物をホッパー４から取出すことなく、ホッパー内でド
ライアイス微粒子が昇華するのをまってもよい。
実施例
添付図面に示したような気送管装置のモックアツプ機を
作製し、酸化アルミニウム粉末（ＡＩ Ｏ粒度Ｈｏｏ
ｏ 、平均粒径１μ）を２３′
気送した。次いで、気送管、サイクロン、ホッパーに残
留した酸化アルミニウム粉末を除去するために、直径約
２順のドライアイス微粒子を気送管に気送した。残留粉
末の回収率を測定した結果を下表に示す。
１回目 ２回目
粉 末 気 送 量 １０００ ｇ
１０００ ｇ粉 末 付 着 量
５８７．９ｇ ４３１３ｇドライアイス気送
量 ２２００ ｇ １０（ＩＱ ｇ付着粉未回
収量 ５３７．５ｇ ４２８．８ｇ回 収
率 ９［％ ９９ ％これら
の結果かられかるように、１回目は９１％、２回目は９
９％、２回の平均で９５％の回収率で、気送管、サイク
ロン、ホッパー内に付着・滞留した粉末を除去、回収す
ることができた。
【発明の効果］
上述したところかられかるようにこの発明による気送管
内の付着・滞留粉末の除去方法によれば、次のような優
れた効果を得ることができる：
■）粉末の代わりにドライアイス微粒子を気送管に気送
するだけであるため、作業が極めて簡単である。
２）既設の設備を改造あるいは追加する必要がない。
８）使用するドライアイスは比重が１．５６であり、硬
度は低いため、気送管内面を損傷する心配はない。
４）粉末が気送管内を気送されるのとまったく同じ経路
を経てドライアイス微粒子が気送されるため、粉末が付
着・滞留しやすい部分を集中的に除去することができる
。
５）気送管内で付着、固化してしまい水洗浄だけでは除
去できないような固着粉末でも効果的に剥離、除去する
ことができる。
６）除去された粉末とドライアイスとの混合物からドラ
イアイスのみが昇華するため、粉末とドライアイスを分
離する作業が不要となる。
７）気送管内さらには関連機器内にドライアイス微粒子
が残留しても昇華してしまうため、不純物として残るこ
とがない。従って、ドライアイスを取出すために機器類
を分解する必要がない。
８）特に核燃料物質粉末の気送管やサイクロン、ホッパ
ーをこの発明方法により洗浄する場合には、粉末取出し
作業に際してサイクロンやホッパーを分解する必要がな
いから、作業効率の向上および被爆低下が図れる。The accompanying drawings are schematic diagrams of a typical nuclear fuel material powder pneumatic tube apparatus. In a normal usage method, the powder 1 in the glove box A is pneumatically fed through the pneumatic pipe 2 to the cyclone 3 installed in the glove box B, where solid-gas separation is carried out, and only the solid powder is transferred to the hopper 4. Store it inside. Thereafter, the powder is taken out from the hopper 4 and transferred to the next subsequent processing device (not shown). Powder 1 via pneumatic tube 2
Air is supplied by blower 5 installed in glove box C.
This is done by creating a negative pressure inside the pneumatic pipe 2, cyclone 3, and hopper 4. In the figure, number 6 is a filter installed in the cyclone, and number 2' is a branch pipe of the pneumatic pipe. From this branch pipe 2', powder of other or similar nuclear fuel material from another glove box (not shown) is pneumatically mixed. During the process of performing such a pneumatic feeding process, powder adheres to or remains on the inner surfaces of the pneumatic pipes 2 and 2', the cyclone 3, the hopper 4, the filter 6, and the like. When removing such adhering and staying powder according to the method of the present invention, it is sufficient to simply pneumatically transport fine dry ice particles in place of powder 1 into the pneumatic pipe in the same manner as the powder. The air-fed dry ice particles are transported through the pneumatic pipe 2, cyclone 3, hopper 4, and filter 6 through the same route as the powder, so that the dry ice particles are air-fed in areas where powder is particularly likely to adhere and accumulate. This effectively and reliably removes adhering and stagnant powder. The size of the dry ice fine particles used at this time may be any size that can be pneumatically fed, and generally fine particles prepared in advance to have a diameter of about 2 mm are preferably used. The removed powder can be recovered by taking out the powder from the hopper 4 as a mixture with dry ice particles and sublimating only the dry ice particles. Alternatively, the mixture of removed powder and dry ice particles may not be removed from the hopper 4, but the dry ice particles may be allowed to sublimate within the hopper. EXAMPLE A mock-up machine for a pneumatic pipe device as shown in the attached drawings was prepared, and aluminum oxide powder (AIO particle size Hoo
o, average particle size 1μ) was insufflated for 23'. Next, in order to remove the aluminum oxide powder remaining in the pneumatic tube, cyclone, and hopper, dry ice fine particles of approximately two sizes in diameter were pneumatically fed into the pneumatic tube. The results of measuring the recovery rate of residual powder are shown in the table below. 1st time 2nd time Powder air supply amount 1000 g
1000g powder adhesion amount
587.9 g 4313 g Amount of dry ice pneumatically fed 2200 g 10 (IQ g Amount of unrecovered powder 537.5 g 428.8 g Recovery rate 9 [% 99% As can be seen from these results, the first time was 91%, 2 The 9th time is 9th
We were able to remove and collect the powder adhering to and staying in the pneumatic tube, cyclone, and hopper with a recovery rate of 9% and an average of 95% for the two tests. [Effects of the Invention] As can be seen from the above, according to the method of removing adhering and staying powder in a pneumatic pipe according to the present invention, the following excellent effects can be obtained: ■) In place of powder The operation is extremely simple as all that is required is to pneumatically transport the dry ice particles into the pneumatic pipe. 2) There is no need to modify or add to existing equipment. 8) The dry ice used has a specific gravity of 1.56 and low hardness, so there is no risk of damaging the inner surface of the pneumatic tube. 4) Since the dry ice particles are pneumatically transported through the same route as the powder is pneumatically transported through the pneumatic pipe, it is possible to intensively remove the areas where the powder tends to adhere and accumulate. 5) It is possible to effectively peel off and remove stuck powder that adheres and solidifies inside the pneumatic pipe and cannot be removed by washing with water alone. 6) Since only the dry ice sublimes from the removed powder and dry ice mixture, there is no need to separate the powder and dry ice. 7) Even if dry ice particles remain in the pneumatic pipe or in related equipment, they will sublimate and will not remain as impurities. Therefore, there is no need to disassemble the equipment to remove the dry ice. 8) In particular, when pneumatic pipes, cyclones, and hoppers for nuclear fuel material powder are cleaned by the method of the present invention, there is no need to disassemble the cyclones and hoppers when removing the powder, which improves work efficiency and reduces exposure to radiation.
添付図面は一般的な核燃料物質粉末の気送管装置の概略
説明図である。
１・・・粉末、 ２．２′・・・気送管、 ３・・・サ
イクロン、 ４・・・ホッパー Ａ、Ｂ、Ｃ・・・グ
ローブボックス。
特許出願人 動力炉・核燃料開発事業団式
理
人
尾
股
０′
雄The accompanying drawing is a schematic illustration of a general nuclear fuel material powder pneumatic pipe apparatus. 1...Powder, 2.2'...Pneumatic tube, 3...Cyclone, 4...Hopper A, B, C...Glove box. Patent applicant: Power Reactor and Nuclear Fuel Development Corporation Shikirijin Omata 0' Male
Claims (1)
って、該気送管内面に付着あるいは滞留した粉末を除去
することを特徴とする気送管内付着・滞留粉末の除去方
法。 ２、核燃料物質粉末の気送管内にドライアイス微粒子を
気送することによって、該気送管内面に付着あるいは滞
留した粉末を除去し該ドライアイス微粒子と共に回収す
ることを特徴とする気送管内の除染方法。 ３、直径が２ｍｍ程度のドライアイス微粒子を用いる請
求項１あるいは２記載の方法。[Claims] 1. Removal of adhering/stagnant powder in a pneumatic tube, characterized in that powder adhering to or staying on the inner surface of the pneumatic tube is removed by pneumatically feeding fine dry ice particles into the pneumatic tube. Method. 2. Pneumatically transporting nuclear fuel material powder into the pneumatic pipe, the powder adhering or staying on the inner surface of the pneumatic pipe is removed and collected together with the dry ice fine particles. Decontamination methods. 3. The method according to claim 1 or 2, wherein dry ice fine particles having a diameter of about 2 mm are used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072467A JPH0711597B2 (en) | 1989-03-24 | 1989-03-24 | Removal method of powder adhered and accumulated in pneumatic tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072467A JPH0711597B2 (en) | 1989-03-24 | 1989-03-24 | Removal method of powder adhered and accumulated in pneumatic tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02249999A true JPH02249999A (en) | 1990-10-05 |
| JPH0711597B2 JPH0711597B2 (en) | 1995-02-08 |
Family
ID=13490143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1072467A Expired - Fee Related JPH0711597B2 (en) | 1989-03-24 | 1989-03-24 | Removal method of powder adhered and accumulated in pneumatic tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711597B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335154A (en) * | 1998-03-09 | 1999-09-15 | System Hygienics Ltd | Cleaning the inside surface of ducts with solid carbon dioxide |
| JP2012210996A (en) * | 2011-03-31 | 2012-11-01 | Yamato Scale Co Ltd | Powder conveying system |
| CN103381966A (en) * | 2013-07-12 | 2013-11-06 | 信易电热机械有限公司 | Plug-in type stop device and using method thereof |
| WO2022208023A1 (en) * | 2021-04-02 | 2022-10-06 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Method and device for transporting powders |
-
1989
- 1989-03-24 JP JP1072467A patent/JPH0711597B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335154A (en) * | 1998-03-09 | 1999-09-15 | System Hygienics Ltd | Cleaning the inside surface of ducts with solid carbon dioxide |
| US6402854B1 (en) | 1998-03-09 | 2002-06-11 | System Hygienics Limited | Method of cleaning the inside surface of ducts |
| GB2335154B (en) * | 1998-03-09 | 2002-10-30 | System Hygienics Ltd | A method of cleaning the inside surface of ducts |
| JP2012210996A (en) * | 2011-03-31 | 2012-11-01 | Yamato Scale Co Ltd | Powder conveying system |
| CN103381966A (en) * | 2013-07-12 | 2013-11-06 | 信易电热机械有限公司 | Plug-in type stop device and using method thereof |
| WO2022208023A1 (en) * | 2021-04-02 | 2022-10-06 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Method and device for transporting powders |
| FR3121365A1 (en) * | 2021-04-02 | 2022-10-07 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | PROCESS FOR TRANSPORTING POWDERS |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0711597B2 (en) | 1995-02-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |