JPH07294315A - Powder level detector - Google Patents
Powder level detectorInfo
- Publication number
- JPH07294315A JPH07294315A JP6108979A JP10897994A JPH07294315A JP H07294315 A JPH07294315 A JP H07294315A JP 6108979 A JP6108979 A JP 6108979A JP 10897994 A JP10897994 A JP 10897994A JP H07294315 A JPH07294315 A JP H07294315A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- ultrasonic sensor
- pipe
- level
- sensor
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は粉体タンク内に貯留され
ている粉体のレベル（容量）を検知するための粉体レベ
ル検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder level detecting device for detecting the level (capacity) of powder stored in a powder tank.
【０００２】[0002]
【従来の技術】従来、粉体塗装等の分野でよく用いられ
ている、空気吹き込み型流動床式粉体タンクでは、粉体
タンク内に貯留されている粉体のレベル（容量）を検知
する方法として、主に静電容量式のセンサーが用いられ
ている。そしてこの静電容量式のセンサーを、粉体タン
クの容量の上限値と下限値の２位置に設けて、このセン
サーによって得られる信号に基づき、粉体容量が常にこ
の上限値と下限値の間にあるような制御が行われてき
た。2. Description of the Related Art An air-blown fluidized bed powder tank, which has been widely used in the field of powder coating, detects the level (capacity) of powder stored in the powder tank. As a method, a capacitance type sensor is mainly used. And, this electrostatic capacity type sensor is provided at two positions of the upper limit value and the lower limit value of the capacity of the powder tank, and the powder capacity is always between the upper limit value and the lower limit value based on the signal obtained by this sensor. The control as in the above has been performed.
【０００３】[0003]
【発明が解決しようとする課題】上記の従来の技術に
は、次のような問題があった。すなわち、それは粘性や
付着し易い性質のある粉体を取り扱う場合に顕著に表れ
る問題であるが、静電容量式のセンサーのセンシング面
に粉体が付着堆積すると、センサーが誤作動を起こして
誤った信号を発することである。これを防止するため
に、圧縮エアを噴出するエアノズルを設け、該エアノズ
ルから定期的に圧縮エアをセンサーに向けて吹き付けて
粉体が付着しないようにクリーニングを行っていた。The above-mentioned conventional techniques have the following problems. In other words, it is a problem that appears prominently when handling powder that is viscous or that tends to adhere, but when powder adheres and accumulates on the sensing surface of a capacitance type sensor, the sensor malfunctions and causes an error. Is to emit a signal. In order to prevent this, an air nozzle that ejects compressed air is provided, and the compressed air is periodically blown from the air nozzle toward the sensor to perform cleaning so that powder does not adhere.
【０００４】また、センサーによって得られる検知信号
は、センサーが設けられている上限と下限の２点だけで
あり、その中間の位置を検出しようとすれば、その必要
とする位置に別個にセンサーを設けなければならなかっ
た。しかし、数多くのセンサーを設けるにはスペース的
にも困難であり、またいかに数多くのセンサーを設けた
としても、それから得られる信号は段階的な信号であ
り、粉体のレベル（容量）を無段階で検知することはで
きなかった。Further, the detection signals obtained by the sensor are only two points, that is, the upper limit and the lower limit, at which the sensor is provided. If an intermediate position is to be detected, the sensor is separately provided at the required position. I had to set it up. However, it is difficult to install a large number of sensors in terms of space, and no matter how many sensors are installed, the signal obtained from them is a stepwise signal, and the powder level (capacity) can be set infinitely. Could not be detected by.
【０００５】また、本発明者等は、上記したような問題
点を解決すべく超音波式センサーを用いて、粉体のレベ
ル（容量）を無段階で検知することを試みてきた。その
方法として粉体タンクの上蓋に、該上蓋から粉体タンク
の内部下方に向けて超音波式センサを設置して、粉体の
レベルを無段階で検知しようとするものであった。しか
しこれはなかなか良い結果が得られなかった。それは、
センサーから発信された超音波が、粉体レベルよりも上
にふわふわと浮遊している粉体によって乱反射されて、
正確な粉体レベルを検知できなかったためと思われる。Further, the present inventors have tried to detect the level (capacity) of the powder steplessly by using an ultrasonic sensor in order to solve the above problems. As a method for this, an ultrasonic sensor is installed on the upper lid of the powder tank from the upper lid toward the lower inside of the powder tank to continuously detect the level of the powder. However, this did not give very good results. that is,
The ultrasonic waves emitted from the sensor are diffusely reflected by the powder that is fluffy and floating above the powder level,
Probably because the accurate powder level could not be detected.
【０００６】本発明は、このような問題点に鑑みてなさ
れたものであり、本発明の目的は、粉体の付着などによ
る誤作動を起こすことがなく、しかも１個のセンサーで
粉体のレベル（容量）を無段階で検知することができ
る、粉体レベル検出装置を提供することを目的とするも
のである。The present invention has been made in view of the above problems, and an object of the present invention is to prevent the occurrence of malfunction due to adhesion of powder and the like. It is an object of the present invention to provide a powder level detection device capable of continuously detecting a level (capacity).
【０００７】[0007]
【課題を解決するための手段】本発明は、上記の目的を
達成するために次のような構成とした。すなわち、粉体
タンクの上蓋に、該上蓋から粉体タンクの内部下方に向
けて設置された超音波センサーと、該超音波センサーの
先端部にパイプ状の保護管を設けた構成の粉体タンク内
の粉体レベル検出装置とした。また前記粉体レベル検出
装置の保護管は、内面が鏡面仕上げされている金属製の
保護管からなる粉体レベル検出装置とした。更にまた前
記粉体レベル検出装置の保護管は、保護管の内面下端部
が滑らかなＲ加工が施されている粉体レベル検出装置と
した。The present invention has the following constitution in order to achieve the above object. That is, a powder tank having a structure in which an ultrasonic sensor is installed on the upper lid of the powder tank from the upper lid toward the inside of the powder tank, and a pipe-shaped protection tube is provided at the tip of the ultrasonic sensor. It was the powder level detector inside. Further, the protective tube of the powder level detecting device is a powder level detecting device made of a metal protective tube whose inner surface is mirror-finished. Furthermore, the protective tube of the powder level detecting apparatus is a powder level detecting apparatus in which the lower end portion of the inner surface of the protective tube is subjected to smooth R processing.
【０００８】[0008]
【作用】次に本発明の作用について説明する。本発明で
は、前記したような構成の粉体レベル検出装置としたの
で、超音波センサーのセンシング面はパイプ状の保護管
によって保護されるので、粉体材料の付着等の汚れによ
る誤作動を起こすこともなく、また保管内には粉体の浮
遊物も侵入しないので、センサーから発信された超音波
は浮遊物によって乱反射されることもなく、常に正確な
粉体レベル位置からの反射波となって粉体レベルを検知
することができ、さらに１個のセンサーで無段階の粉体
レベルを検出することができる。Next, the operation of the present invention will be described. According to the present invention, since the powder level detecting device having the above-described configuration is used, the sensing surface of the ultrasonic sensor is protected by the pipe-shaped protective tube, which causes malfunction due to dirt such as adhesion of powder material. In addition, since the suspended matter of the powder does not enter the storage, the ultrasonic waves emitted from the sensor are not diffusely reflected by the suspended matter, and always become the reflected wave from the accurate powder level position. It is possible to detect the powder level with the use of a single sensor.
【０００９】[0009]
【実施例】以下本発明の粉体レベル検出装置を、その実
施例を示す図面を用いて詳細に説明する。図１は本発明
の粉体レベル検出装置を粉体塗装装置に適用した実施例
の全体構成を示す図であり、図２は本発明による粉体レ
ベル検出装置の詳細図であり、図３は本発明による粉体
レベル検出装置によって得られた信号の処理の事例を示
す図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The powder level detecting device of the present invention will be described in detail below with reference to the drawings showing the embodiments. FIG. 1 is a diagram showing an overall configuration of an embodiment in which the powder level detecting device of the present invention is applied to a powder coating device, FIG. 2 is a detailed view of the powder level detecting device of the present invention, and FIG. It is a figure which shows the example of a process of the signal acquired by the powder level detection apparatus by this invention.
【００１０】図において符号１は空気吹き込み型の流動
床式の粉体タンクであり、該粉体タンク１は、管路２を
介して制御装置３で調整された圧縮気体４を、前記流動
床式の粉体タンク１の底部の空気室５に導入し、通気性
の多孔質板６を通して粉体タンク１内へ吹き込み、多孔
質板６の上側にある粉体塗料７が、流動状態に貯留され
るものである。In the figure, reference numeral 1 is an air-blowing type fluidized bed type powder tank, and the powdered tank 1 stores a compressed gas 4 adjusted by a control device 3 via a conduit 2 in the fluidized bed. Introduced into the air chamber 5 at the bottom of the powder tank 1, and blown into the powder tank 1 through the air-permeable porous plate 6, and the powder paint 7 on the upper side of the porous plate 6 is stored in a fluid state. It is what is done.
【００１１】８は前記粉体タンク１の上蓋９上に設置さ
れたエゼクタポンプであり、該エゼクタポンプ８は、制
御装置３によって調整された圧縮気体を管路１０から受
けて、エゼクタポンプ内のベンチュリー作用により、粉
体タンク１内に挿入された吸引管１１から流動状態の粉
体塗料７を吸引し、更にホース１２を介して粉体噴出ガ
ン１３へと輸送され、一方、制御装置３からケーブル１
３を介して粉体噴出ガン１３へ供給される高電圧による
コロナ放電によって、粉体塗料は静電気的に帯電され
て、粉体噴出ガン１３から被塗物へ向けて噴出される。Reference numeral 8 is an ejector pump installed on the upper lid 9 of the powder tank 1. The ejector pump 8 receives the compressed gas adjusted by the control device 3 from the pipe line 10 and is installed in the ejector pump. By the Venturi action, the powder coating material 7 in a fluidized state is sucked from the suction pipe 11 inserted in the powder tank 1, and is further transported to the powder ejection gun 13 via the hose 12, while the control device 3 Cable 1
The powder paint is electrostatically charged by corona discharge due to the high voltage supplied to the powder jet gun 13 via 3, and is jetted from the powder jet gun 13 toward the object to be coated.
【００１２】そして本発明による粉体レベル検出装置１
４は、粉体タンク１の上蓋９に粉体タンク１の内部下方
に向けて設置された超音波センサー１５と、該超音波セ
ンサー１５の先端部に取り付けられた金属製でパイプ状
の保護管１６等によって構成される。The powder level detecting device 1 according to the present invention
Reference numeral 4 denotes an ultrasonic sensor 15 installed on the upper lid 9 of the powder tank 1 toward the lower inside of the powder tank 1, and a metal-made pipe-shaped protective tube attached to the tip of the ultrasonic sensor 15. 16 and the like.
【００１３】１７は超音波センサー１５と制御装置３と
を結ぶ信号ケーブルで、１８は保護管１６の上部に設け
られた空気抜き孔である。また保護管１６の内面は超音
波に対してノイズの発生を避けるため鏡面仕上げか滑ら
かなクロームメッキ等の仕上げ面とすることが望まし
く、さらに保護管１６の内面下端部は滑らかなＲ加工が
施されるのが望ましい。保護管１６の内面下端部がシャ
ープエッジをしていると、超音波がその部分で反応する
場合があり誤作動の要因となる場合もある。本実施例で
は保護管１６としてステンレスで内面を鏡面仕上げした
ものを用いた。また保護管１６にテフロン等のプラスチ
ック製のパイプを用いたところ共振作用が起こるためか
金属製のものに比べてやや劣るようなデータが得られ
た。プラスチック製の保護管を用いる場合にはこれらの
配慮が必要となろう。Reference numeral 17 is a signal cable connecting the ultrasonic sensor 15 and the control device 3, and reference numeral 18 is an air vent hole provided in the upper portion of the protective tube 16. Further, the inner surface of the protective tube 16 is preferably a mirror-finished surface or a smooth surface such as chrome plating in order to avoid generation of noise against ultrasonic waves, and the lower end portion of the inner surface of the protective tube 16 is subjected to smooth R processing. It is desirable to be done. If the lower end of the inner surface of the protective tube 16 has a sharp edge, ultrasonic waves may react at that portion, which may cause malfunction. In this embodiment, the protective tube 16 is made of stainless steel whose inner surface is mirror-finished. Also, when a plastic pipe made of Teflon or the like is used as the protective pipe 16, data is obtained which is slightly inferior to that made of metal, probably because a resonance action occurs. These considerations may be necessary when using a plastic protective tube.
【００１４】図３は本粉体レベル検出装置１４によって
得られた信号の処理の事例を示したもので、超音波セン
サー１５によってセンシングされた粉体タンク１内の粉
体塗料７のレベル信号は、信号ケーブル１７を介して制
御装置３内に組み込まれたアンプ１９で増幅され、Ａ／
Ｄ変換器２０でデジタル信号に変換され、デジタル表示
器２１によってデジタル表示される。さらに設定器２２
によってあらかじめ設定された値、例えば粉体塗料７の
レベルの上限値と下限値とを設定器２２に設定しておく
ことにより、比較器２３によって超音波センサー１５か
らの信号と、設定器２２に設定された値とを比較し、設
定値の範囲から外れた場合にはアラーム信号２４を出力
するにうに構成されている。FIG. 3 shows an example of the processing of the signal obtained by the powder level detecting device 14, in which the level signal of the powder coating material 7 in the powder tank 1 sensed by the ultrasonic sensor 15 is , Is amplified by the amplifier 19 incorporated in the control device 3 via the signal cable 17,
The digital signal is converted by the D converter 20 and digitally displayed by the digital display 21. Furthermore, the setting device 22
By setting a value preset in accordance with, for example, the upper limit value and the lower limit value of the level of the powder coating material 7 in the setter 22, the comparator 23 causes the signal from the ultrasonic sensor 15 to be set in the setter 22. The set value is compared, and if the set value is out of the range, the alarm signal 24 is output.
【００１５】以上本発明の粉体レベル検出装置を、粉体
塗装装置に適用した実施例を説明したが、本実施例によ
れば、超音波センサーのセンシング面はパイプ状の保護
管によって保護されるので、粉体材料の付着等の汚れに
よる誤作動を起こすこともなく、また保管内には粉体の
浮遊物も侵入しないので、センサーから発信された超音
波は浮遊物によって乱反射されることもなく、常に正確
な粉体レベルを検知することができ、さらに１個のセン
サーで無段階の粉体レベルを検出することができる。Although the embodiment in which the powder level detecting device of the present invention is applied to the powder coating device has been described above, according to this embodiment, the sensing surface of the ultrasonic sensor is protected by the pipe-shaped protection tube. Since it does not cause malfunction due to dirt such as adhesion of powder material, and powder suspended matter does not enter the storage, ultrasonic waves emitted from the sensor are diffusely reflected by the suspended matter. Moreover, it is possible to always detect the accurate powder level, and it is possible to detect the stepless powder level with one sensor.
【００１６】[0016]
【発明の効果】本発明の粉体塗布ノズル装置は、上記の
ような構成としたので、センサーへの粉体の付着などに
よる誤作動を起こすことがなく、しかも１個のセンサー
で粉体のレベル（容量）を無段階で検知することができ
る、粉体レベル検出装置を提供することができる。Since the powder coating nozzle device of the present invention is configured as described above, it does not cause malfunction due to adhesion of the powder to the sensor and the like. It is possible to provide a powder level detection device capable of continuously detecting the level (capacity).
【図１】本発明の粉体レベル検出装置を粉体塗装装置に
適用した実施例の全体構成を示す図。FIG. 1 is a diagram showing an overall configuration of an embodiment in which a powder level detection device of the present invention is applied to a powder coating device.
【図２】本発明による粉体レベル検出装置の詳細図。FIG. 2 is a detailed view of a powder level detecting device according to the present invention.
【図３】本発明による粉体レベル検出装置によって得ら
れた信号の処理の事例を示す図である。FIG. 3 is a diagram showing an example of processing of a signal obtained by the powder level detecting device according to the present invention.
１…粉体タンク ３…制御装
置 ７…粉体塗料 ９…上蓋 １３…粉体噴出ガン １４…粉体レ
ベル検出装置 １５…超音波センサー １６…保護管DESCRIPTION OF SYMBOLS 1 ... Powder tank 3 ... Control device 7 ... Powder coating 9 ... Upper lid 13 ... Powder ejection gun 14 ... Powder level detection device 15 ... Ultrasonic sensor 16 ... Protective tube
Claims (3)
ンクの内部下方に向けて設置された超音波センサーと、
該超音波センサーの先端部にパイプ状の保護管を設けた
ことを特徴とする粉体タンク内の粉体レベル検出装置。1. An ultrasonic sensor installed on the upper lid of the powder tank, the ultrasonic sensor being installed from the upper lid toward the lower inside of the powder tank,
A powder level detecting device in a powder tank, characterized in that a pipe-shaped protective tube is provided at the tip of the ultrasonic sensor.
属製の保護管からなる請求項１に記載の粉体レベル検出
装置。2. The powder level detecting device according to claim 1, wherein the protective tube is made of a metallic protective tube whose inner surface is mirror-finished.
されている請求項１又は請求項２に記載の粉体レベル検
出装置。3. The powder level detecting device according to claim 1, wherein the lower end of the inner surface of the protective tube is subjected to smooth R processing.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10897994A JP3364699B2 (en) | 1994-04-25 | 1994-04-25 | Powder level detector |
| PCT/JP1995/000807 WO1995029387A1 (en) | 1994-04-25 | 1995-04-25 | Powder level indicator |
| AU22676/95A AU2267695A (en) | 1994-04-25 | 1995-04-25 | Powder level indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10897994A JP3364699B2 (en) | 1994-04-25 | 1994-04-25 | Powder level detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07294315A true JPH07294315A (en) | 1995-11-10 |
| JP3364699B2 JP3364699B2 (en) | 2003-01-08 |
Family
ID=14498510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10897994A Expired - Lifetime JP3364699B2 (en) | 1994-04-25 | 1994-04-25 | Powder level detector |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3364699B2 (en) |
| AU (1) | AU2267695A (en) |
| WO (1) | WO1995029387A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015107217A1 (en) * | 2014-01-20 | 2015-07-23 | Alfons Tschritter Gmbh | Device and method for conveying fluent material, more particularly loose material |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105173745A (en) * | 2015-05-06 | 2015-12-23 | 天津市实达电力设备有限公司 | Adjustable material fluidization machine |
| DE102018105572B3 (en) * | 2018-03-12 | 2019-03-14 | Al-Ko Therm Gmbh | dedusting |
| KR20220031745A (en) | 2019-07-26 | 2022-03-11 | 벨로3디, 인크. | Quality assurance for 3D object shaping |
| WO2023129489A1 (en) * | 2021-12-27 | 2023-07-06 | Velo3D, Inc | Material detection, conveyance, and conditioning systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57199918A (en) * | 1981-06-03 | 1982-12-08 | Toshiba Corp | Liquid level detector |
-
1994
- 1994-04-25 JP JP10897994A patent/JP3364699B2/en not_active Expired - Lifetime
-
1995
- 1995-04-25 AU AU22676/95A patent/AU2267695A/en not_active Abandoned
- 1995-04-25 WO PCT/JP1995/000807 patent/WO1995029387A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015107217A1 (en) * | 2014-01-20 | 2015-07-23 | Alfons Tschritter Gmbh | Device and method for conveying fluent material, more particularly loose material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3364699B2 (en) | 2003-01-08 |
| WO1995029387A1 (en) | 1995-11-02 |
| AU2267695A (en) | 1995-11-16 |
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