WO1995029387A1 - Powder level indicator - Google Patents

Powder level indicator Download PDF

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Publication number
WO1995029387A1
WO1995029387A1 PCT/JP1995/000807 JP9500807W WO9529387A1 WO 1995029387 A1 WO1995029387 A1 WO 1995029387A1 JP 9500807 W JP9500807 W JP 9500807W WO 9529387 A1 WO9529387 A1 WO 9529387A1
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WO
WIPO (PCT)
Prior art keywords
powder
level
sensor
tank
ultrasonic sensor
Prior art date
Application number
PCT/JP1995/000807
Other languages
French (fr)
Japanese (ja)
Inventor
Tsuyoshi Moriyama
Wataru Kakuta
Kenji Fukunaga
Original Assignee
Nordson Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nordson Corporation filed Critical Nordson Corporation
Priority to AU22676/95A priority Critical patent/AU2267695A/en
Publication of WO1995029387A1 publication Critical patent/WO1995029387A1/en

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    • 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

Definitions

  • the present invention relates to a powder level detection device for detecting the level (capacity) of powder stored in a powder tank.
  • the conventional technology described above has the following problems. That is, when powder accumulates and accumulates on the sensing surface of a force or capacitance sensor, which is a problem that is particularly noticeable when handling powders that have a tendency to adhere or stick. One is that it malfunctions and emits the wrong signal. To prevent this, an air nozzle that blows out compressed air is provided, and the air nozzle is periodically sprayed with a compression air toward the sensor to clean the powder so that powder does not adhere. Had gone.
  • the detection signal obtained by the sensor 1 is only two points, the upper limit and the lower limit, where the sensor is installed, and the intermediate position is To detect it, a separate sensor had to be provided at the required location.
  • the signal obtained therefrom is a gradual signal, and the level of the powder (Capacity) cannot be detected steplessly.
  • the present inventors have tried to detect the level (capacity) of the powder in a stepless manner using an ultrasonic sensor in order to solve the above-mentioned problems.
  • an ultrasonic sensor is installed on the upper lid of the powder tank from the upper lid to the inside of the powder tank, and the level of the powder is detected continuously. It was a thing. But this didn't work very well. This is probably because the ultrasonic waves emitted from the sensor were irregularly reflected by the powder floating above the powder level, and the accurate powder level could not be detected.
  • the present invention has been made in view of such a problem, and it is an object of the present invention to prevent a malfunction due to powder adhesion and the like, and to obtain a powder with a single sensor. It is an object of the present invention to provide a powder level detecting device capable of detecting a level (capacity) in a stepless manner.
  • the present invention provides an ultrasonic sensor installed on an upper lid of a powder tank from the upper lid toward a lower part of the inside of the powder tank.
  • a sensor and a powder level detecting device in a powder tank having a configuration in which a pipe-shaped protection tube is provided at a tip portion of the ultrasonic sensor.
  • the protective tube of the powder level detecting device is made of metal whose inner surface is mirror-finished.
  • the protection tube of the powder level detection device is subjected to a smooth rounding at the lower end of the inner surface of the protection tube.
  • the powder level detecting device having the above-described configuration
  • the sensing surface of the ultrasonic sensor is protected by the pipe-shaped protective tube, so that the powder material adheres.
  • the ultrasonic wave transmitted from the sensor is irregularly reflected by the suspended matter
  • the powder level can always be detected as a reflected wave from the accurate powder level position, and the stepless powder level can be detected with a single sensor. Can be.
  • 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 according to the present invention.
  • 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.
  • FIG. 1 shows the powder level detector of the present invention.
  • FIG. 2 is a view showing the entire configuration of an embodiment in which the apparatus is applied to a powder coating apparatus
  • FIG. 2 is a detailed view of a powder level detecting apparatus according to the present invention
  • FIG. 4 is a diagram illustrating an example of processing of a signal obtained by a detection device.
  • reference numeral 1 denotes a fluidized bed powder tank of an air blowing type, and the powdered tank 1 sends compressed gas 4 adjusted by a control device 3 through a pipe 2 to the fluidized bed. Is introduced into the air chamber 5 at the bottom of the powder tank 1 of the formula, and is blown into the powder tank 1 through the permeable porous plate 6, and the powder coating 7 on the upper side of the porous plate 6 flows. It is stored in a state.
  • Reference numeral 8 denotes 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 pipeline 10. Then, by the action of the ventilator in the pump, the powder paint 7 in the flowing state is sucked from the suction pipe 11 inserted into the powder tank 1 and further through the hose 12.
  • the powder paint is transported to the powder ejection gun 13, while the powder paint is discharged by the high voltage supplied by the controller 3 to the powder ejection gun 13 via the cable 26. Is electrostatically charged and is ejected from the powder ejection gun 13 toward the object to be coated.
  • the powder level detecting device 14 comprises an ultrasonic sensor 15 installed on the upper lid 9 of the powder tank 1 toward the inside and below the powder tank 1, and the ultrasonic sensor 15. It is composed of a metal pipe protection tube 16 attached to the tip of the sensor 15. Reference numeral 17 denotes a signal cable connecting the ultrasonic sensor 15 to the control device 3, and reference numeral 18 denotes an air vent hole provided at an upper portion of the protection tube 16.
  • the inner surface of the protective tube 16 is desirably a mirror-finished surface or a smooth chrome finish, etc., in order to avoid generating noise due to ultrasonic waves. It is desirable that the lower edge of the inner surface be smooth-radiated.
  • the protection tube 16 used was a stainless steel tube whose inner surface was mirror-finished. Also, when a pipe made of plastic such as Teflon was used for the protective tube 16, the effect was somewhat inferior to that made of metal because of the resonance effect. These considerations will be necessary when using plastic protection tubes.
  • Fig. 3 shows an example of the processing of the signal obtained by the present powder level detector ⁇ 4.
  • the inside of the powder tank 1 sensed by the ultrasonic sensor ⁇ 5 is shown.
  • the level signal of the powder paint 7 is amplified by an amplifier 19 incorporated in the control device 3 via a signal cable 17, converted into a digital signal by an AZD converter 20, and converted to a digital display. Displayed digitally by 2 1. Further, by setting the values preset by the setting unit 22, for example, the upper limit value and the lower limit value of the level of the powder coating material 7, in the setting unit 22, 3 compares the signal from the ultrasonic sensor 15 with the value set in the setter 22 and deviates from the set value range. It is configured to output an alarm signal 24 in the event of a failure.
  • the powder level detecting device of the present invention is applied to a powder coating device.
  • the sensing surface of the ultrasonic sensor is formed by a pipe-shaped protective tube. It is protected by dust, so there is no malfunction due to dirt such as adhesion of powder material, and no suspended matter of powder enters the storage, so the ultrasonic wave transmitted from the sensor An accurate powder level can always be detected without irregular reflections from suspended matter, and one sensor
  • the stepless powder level can be detected.
  • the powder application nozzle device of the present invention has the above-described configuration, it does not cause malfunction due to the adhesion of the powder to the sensor and the like, and furthermore, the level of the powder can be reduced by one sensor. It is possible to provide a powder level detecting device capable of detecting (capacity) in a stepless manner.

Abstract

A powder level indicator free from malfunction due to deposition of powder, which indicates a level (capacity) of powder steplessly by using only one sensor. The indicator is disposed inside a powder tank. It includes an ultrasonic sensor attached to an upper cover in such a manner as to face downward inside the powder tank, and a protective pipe provided at the distal end of the ultrasonic sensor. The protective pipe comprises a metallic protective pipe whose inner surface is mirror-finished. The lower end portion of the inner surface of this protective pipe is smoothly rounded.

Description

明 細 書  Specification
粉体レベル検出装置  Powder level detector
技術分野 Technical field
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。  The present invention relates to a powder level detection device for detecting the level (capacity) of powder stored in a powder tank.
背景技術 Background art
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 In the past, air-blowing fluidized bed powder tanks, which have been widely used in the field of powder coating, detect the level (capacity) of the powder stored in the powder tank. As a method, a capacitance type sensor is mainly used. And this capacitance type sensor
—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、 このセンサ一によ 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。 Are provided at two positions, the upper limit and the lower limit of the capacity of the powder tank, and based on the signal obtained by this sensor, the powder capacity is always between the upper limit and the lower limit. Such control has been performed.
上記の従来の技術には、 次のよ う な問題があつた。 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力、 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、 センサ一が誤作動を起こ 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ェ ァをセンサ一に向けて吹き付けて粉体が付着 しないよ う にク リ 一二ングを行っていた。  The conventional technology described above has the following problems. That is, when powder accumulates and accumulates on the sensing surface of a force or capacitance sensor, which is a problem that is particularly noticeable when handling powders that have a tendency to adhere or stick. One is that it malfunctions and emits the wrong signal. To prevent this, an air nozzle that blows out compressed air is provided, and the air nozzle is periodically sprayed with a compression air toward the sensor to clean the powder so that powder does not adhere. Had gone.
ま た、 センサ一によ 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 ょ う とすれば、 その必要とする位置に別個にセ ンサ一を 設けなければならなかっ た。 しかし、 数多く のセンサ一を設け 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 —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 かつ た。 Also, the detection signal obtained by the sensor 1 is only two points, the upper limit and the lower limit, where the sensor is installed, and the intermediate position is To detect it, a separate sensor had to be provided at the required location. However, it is difficult to provide many sensors in terms of space, and no matter how many sensors are provided, the signal obtained therefrom is a gradual signal, and the level of the powder (Capacity) cannot be detected steplessly.
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 ょ う とする ものであつ 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。  In addition, the present inventors have tried to detect the level (capacity) of the powder in a stepless manner using an ultrasonic sensor in order to solve the above-mentioned problems. As a method, an ultrasonic sensor is installed on the upper lid of the powder tank from the upper lid to the inside of the powder tank, and the level of the powder is detected continuously. It was a thing. But this didn't work very well. This is probably because the ultrasonic waves emitted from the sensor were irregularly reflected by the powder floating above the powder level, and the accurate powder level could not be detected.
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 such a problem, and it is an object of the present invention to prevent a malfunction due to powder adhesion and the like, and to obtain a powder with a single sensor. It is an object of the present invention to provide a powder level detecting device capable of detecting a level (capacity) in a stepless manner.
発明の開示 Disclosure of the invention
上記の目的を達成するために本発明は、 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 ンサ一と、 該超音波セ ンサ一の先端部にパイ 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を提供する。 In order to achieve the above object, the present invention provides an ultrasonic sensor installed on an upper lid of a powder tank from the upper lid toward a lower part of the inside of the powder tank. Provided is a sensor and a powder level detecting device in a powder tank having a configuration in which a pipe-shaped protection tube is provided at a tip portion of the ultrasonic sensor.
また粉体レベル検出装置の保護管は、 内面が鏡面仕上げされ ている金属製のものとすることが好ま しい。  Further, it is preferable that the protective tube of the powder level detecting device is made of metal whose inner surface is mirror-finished.
更にまた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 こ とが好ま しい。  Further, it is preferable that the protection tube of the powder level detection device is subjected to a smooth rounding at the lower end of the inner surface of the protection tube.
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 サ一で無段階の粉体レベルを検出する こ とができる。  In 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, so that the powder material adheres. There is no malfunction due to dirt such as etc., and no suspended matter of powder enters the storage, so the ultrasonic wave transmitted from the sensor is irregularly reflected by the suspended matter In addition, the powder level can always be detected as a reflected wave from the accurate powder level position, and the stepless powder level can be detected with a single sensor. Can be.
図面の簡単な説明 BRIEF DESCRIPTION OF THE FIGURES
第 1 図は、 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る。  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.
第 2 図は、 本発明によ る粉体レベル検出装置の詳細図である。 第 3図は、 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。  FIG. 2 is a detailed view of the powder level detecting device according to the present invention. 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.
実施例 Example
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。 第 1 図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、 第 2 図は本発明による粉体レベル検出装置の詳細図であ り、 第 3図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。 Hereinafter, a powder level detecting apparatus according to the present invention will be described in detail with reference to the drawings showing the embodiments. Fig. 1 shows the powder level detector of the present invention. FIG. 2 is a view showing the entire configuration of an embodiment in which the apparatus is applied to a powder coating apparatus, FIG. 2 is a detailed view of a powder level detecting apparatus according to the present invention, and FIG. FIG. 4 is a diagram illustrating an example of processing of a signal obtained by a detection device.
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 denotes a fluidized bed powder tank of an air blowing type, and the powdered tank 1 sends compressed gas 4 adjusted by a control device 3 through a pipe 2 to the fluidized bed. Is introduced into the air chamber 5 at the bottom of the powder tank 1 of the formula, and is blown into the powder tank 1 through the permeable porous plate 6, and the powder coating 7 on the upper side of the porous plate 6 flows. It is stored in a state.
8 は前記粉体タ ンク 1 の上蓋 9上に設置されたェゼク 夕ボン プであ り、 該ェゼク 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 1 0から受けて、 ェゼク 夕ポンプ内のベン チユ リ 一作用によ り、 粉体タ ン ク 1 内に挿入された吸引管 1 1 から流動状態の粉体塗料 7 を吸引 し、 更にホース 1 2 を介して 粉体噴出ガ ン 1 3へと輸送され、 一方、 制御装置 3からケープ ル 2 6 を介して粉体噴出ガン 1 3へ供給される高電圧による コ 口十放電によ って、 粉体塗料は静電気的に帯電されて、 粉体噴 出ガン 1 3から被塗物へ向けて噴出される。  Reference numeral 8 denotes 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 pipeline 10. Then, by the action of the ventilator in the pump, the powder paint 7 in the flowing state is sucked from the suction pipe 11 inserted into the powder tank 1 and further through the hose 12. The powder paint is transported to the powder ejection gun 13, while the powder paint is discharged by the high voltage supplied by the controller 3 to the powder ejection gun 13 via the cable 26. Is electrostatically charged and is ejected from the powder ejection gun 13 toward the object to be coated.
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 1 5 と、 該超音波セ ンサ一 1 5 の先端部に取り付けられた 金属製でパイ プ状の保護管 1 6等によ って構成される。 1 7 は超音波センサ一 1 5 と制御装置 3 と を結ぶ信号ケープ ルで、 1 8は保護管 1 6 の上部に設けられた空気抜き孔である。 また保護管 1 6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 ツ キ等の仕上げ面とする こ とが望ま し く、 さ らに保護管 1 6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 1 6の内面下端部がシャ —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 1 6 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 1 6 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 うなデ一夕が得られた。 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。 The powder level detecting device 14 according to the present invention comprises an ultrasonic sensor 15 installed on the upper lid 9 of the powder tank 1 toward the inside and below the powder tank 1, and the ultrasonic sensor 15. It is composed of a metal pipe protection tube 16 attached to the tip of the sensor 15. Reference numeral 17 denotes a signal cable connecting the ultrasonic sensor 15 to the control device 3, and reference numeral 18 denotes an air vent hole provided at an upper portion of the protection tube 16. In addition, the inner surface of the protective tube 16 is desirably a mirror-finished surface or a smooth chrome finish, etc., in order to avoid generating noise due to ultrasonic waves. It is desirable that the lower edge of the inner surface be smooth-radiated. If the lower end of the inner surface of the protection tube 16 has a sharp edge, the ultrasonic wave may react at that portion, which may cause a malfunction. In this embodiment, the protection tube 16 used was a stainless steel tube whose inner surface was mirror-finished. Also, when a pipe made of plastic such as Teflon was used for the protective tube 16, the effect was somewhat inferior to that made of metal because of the resonance effect. These considerations will be necessary when using plastic protection tubes.
第 3図は本粉体レベル検出装置 〗 4 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 〗 5 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 1 7 を介して制御装置 3 内に組み込まれたア ンプ 1 9で増幅され、 A Z D変換器 2 0でデジ タル信号に変換され、 デジタル表示器 2 1 によ ってデジタ ル表示される。 さ らに設定 器 2 2 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 2 2 に設定しておく こ とに よ り、 比較器 2 3 によ って超音波セ ンサー 1 5からの信号と、 設定器 2 2 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 2 4 を出力するよ う に構成されている。 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 f 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Fig. 3 shows an example of the processing of the signal obtained by the present powder level detector〗 4. The inside of the powder tank 1 sensed by the ultrasonic sensor〗 5 is shown. The level signal of the powder paint 7 is amplified by an amplifier 19 incorporated in the control device 3 via a signal cable 17, converted into a digital signal by an AZD converter 20, and converted to a digital display. Displayed digitally by 2 1. Further, by setting the values preset by the setting unit 22, for example, the upper limit value and the lower limit value of the level of the powder coating material 7, in the setting unit 22, 3 compares the signal from the ultrasonic sensor 15 with the value set in the setter 22 and deviates from the set value range. It is configured to output an alarm signal 24 in the event of a failure. The embodiment in which the powder level detecting device of the present invention is applied to a powder coating device is described above. According to this embodiment, the sensing surface of the ultrasonic sensor is formed by a pipe-shaped protective tube. It is protected by dust, so there is no malfunction due to dirt such as adhesion of powder material, and no suspended matter of powder enters the storage, so the ultrasonic wave transmitted from the sensor An accurate powder level can always be detected without irregular reflections from suspended matter, and one sensor
—で無段階の粉体レベルを検出する こ とができる。 With-, the stepless powder level can be detected.
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 個のセンサ一で粉体のレベル （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 application nozzle device of the present invention has the above-described configuration, it does not cause malfunction due to the adhesion of the powder to the sensor and the like, and furthermore, the level of the powder can be reduced by one sensor. It is possible to provide a powder level detecting device capable of detecting (capacity) in a stepless manner.

Claims

請 求 の 範 囲 The scope of the claims
1 . 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 端部に設けたパイプ状の保護管とから成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 from the upper lid to the inside of the powder tank and downward, and a pipe-shaped protective tube provided at the tip end of the ultrasonic sensor. Powder level detector in powder tank.
2. 保護管の内面が鏡面仕上げされている金属製の保護管か らなる請求の範囲第 1 項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 inner surface of the protective tube is a mirror-finished metal protective tube.
3. 保護管の内面下端が滑らかな R加工が施されている請求 の範囲第 1 項又は第 2項に記載の粉体レベル検出装置。  3. The powder level detection device according to claim 1, wherein the lower end of the inner surface of the protection tube is subjected to a smooth R-work.
PCT/JP1995/000807 1994-04-25 1995-04-25 Powder level indicator WO1995029387A1 (en)

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EP3539639A1 (en) * 2018-03-12 2019-09-18 AL-KO Therm GmbH Dust extractor device
WO2023129489A1 (en) * 2021-12-27 2023-07-06 Velo3D, Inc Material detection, conveyance, and conditioning systems

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AU2267695A (en) 1995-11-16

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