JP2005009939A - Apparatus for detecting remaining quantity of liquid - Google Patents

Apparatus for detecting remaining quantity of liquid Download PDF

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Publication number
JP2005009939A
JP2005009939A JP2003172524A JP2003172524A JP2005009939A JP 2005009939 A JP2005009939 A JP 2005009939A JP 2003172524 A JP2003172524 A JP 2003172524A JP 2003172524 A JP2003172524 A JP 2003172524A JP 2005009939 A JP2005009939 A JP 2005009939A
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detection
liquid
mounting plate
air
pressure
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Japanese (ja)
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Kunio Misu
国男 三須
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Anest Iwata Corp
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Anest Iwata Corp
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  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe, simple, and highly reliable apparatus for detecting the remaining quantity of a liquid which solves the problem that coating failures have often occurred due to the exhaustion of coating in the case of detecting a liquid remaining in a container especially in a sealed type coating container of which the inside can not be viewed. <P>SOLUTION: In the apparatus for detecting the remaining quantity of a liquid, a mounting plate for mounting the container housing the liquid is supported by an elastic body, and a pneumatic detection means for detecting the movement of the mounting plate due to weight changes caused by increases and reductions of the liquid is provided. By outputting high-pressure air by a detection signal to sound an alarm whistle, etc., workmen are notified that the remaining quantity of the liquid in the container is becoming low. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】本発明は塗料容器、加圧式容器、その他の充填容器における残量検知に係り、特に電気を使用できない引火爆発の恐れのある箇所に配置される各種容器における液体残量検知装置に関する。
【0002】
【従来の技術】スプレーガンを用いた塗装作業の一例として、加圧式塗料タンク内に貯溜した塗料を加圧し、塗料ホースを経由してスプレーガンに供給する形態がよく見受けられるが、前記塗料は密閉された加圧式容器内に貯溜されているために外部より目視できず、塗料残量が確認できないため、しばしば塗料切れによる塗装不良が生じていた。かかる問題点を解消するために、容器内の塗料残量を検知する手段が求められていたが、密閉加圧容器であるため塗料による浮力や背圧等の物理量の変化を検知することが難しかった。また塗料等の引火性液体の残量を検知することから、火災の危険性を排除する必要があり単純に電気的な検知手段を利用することができなかった。
【0003】
本発明者は先に、塗料等の引火性液体の残量検知装置として特許公報第2895927号において、電気的検出によらない方法として充填物の増減に比例して変化する充填容器の荷重を受圧し容器内の充填物の残量を検知する技術を開示している。これらの技術は塗料が収容された塗料容器の重量を、片持ち支持する気体圧生成器が検出し、生成した圧力を連続的に圧力計に表示するようになっている。
【0004】
【発明が解決しようとする課題】しかしながら、前記公報の技術においては重量変化に伴う前記気体圧生成器に付設される受圧子のわずかな変位を、ダイアフラムを介して気体の圧力に変換するため、微妙な重量変化への追従性が十分ではなく、液面位置を検知する精度に課題があった。また、生成した圧力を圧力計に表示はするが、残量が残り少なくなったことを確認するには圧力計の表示が見える範囲まで作業者が近づく必要があり、よって離れて作業する際に確認ができないことと、作業者が意識して能動的に確認しない限り残量が残り少なくなったことを知り得ないため、時として液体補充のタイミングを逃してしまうなどの課題があった。精度良く安定して検知し、且つ作業者に確実に知らせる装置が求められていた。
【0005】
本発明は上記事情に鑑み成されたもので、その目的は、簡単な構造で残量の確認、特に液面下限時での確認を、精度良く安定して確実に行え、取扱い性の優れた安価で安全な残液検知装置を得ることを目的とする。
【0006】
【課題を解決するための手段】このような課題を解決するために、本発明は床面に設置されたベース板の上で、液体を収容した容器を載せた載せ板を弾性体で支持し、液体の増減に伴う重量変化による前記載せ板の移動を検知し信号を出力する液体残量検知装置において、液体を使用し容器内の液体が減少すると容器全体の重量が減少するので、減少する前に釣り合って静止していた載せ板が弾性体の力によって移動する。この移動を検出するために空圧式の検出手段を設けたことを特徴とするものである。検出手段からの検出信号により高圧空気(例えば5bar程度)を出力する手段と、該高圧空気により作動する警報手段とを設けることによって、前記高圧空気を利用し、例えば警笛を鳴らすことで作業者に容器内の液体残量が残り少なくなったことを知らせることができる。
【0007】
また、移動を検出する空圧式検出手段を、前記載せ板の移動により形成される検出部のスキマに、検出空気を吐出し、該吐出空気の背圧変動により検出信号を出力する近接センサとすることにより課題解決が達成できる。
【0008】
また、他の手段として吐出空気ノズルと空気受圧部を有する検出部とを設けて、検出空気を流しこの流れに対して前記載せ板の移動により前記受圧部への入力を遮断する遮蔽部を設けることで同様に課題解決が達成できる。
【0009】
また、高圧空気を出力する手段が、検出部に吐出する検出空気が遮断された時、該検出空気でダイアフラムを作動させ高圧空気バルブを開いて高圧空気を出力する空気式増圧器であって、前記検出空気の吐出を遮断する検出信号の入力に、前記検出部に吐出させた検出空気が、前記載せ板の移動により近接した検出ノズルに流入した検出空気を使用するので、安価で簡単な構成とすることができ課題解決が達成できる。
【0010】
また、警報手段として高圧空気で警笛を鳴らすことを特徴とすることで課題解決が達成できる。
【0011】
また、床面に設置されたベース板の上で、液体を収容した容器を載せた載せ板を弾性体で支持し、液体の増減による重量変化で前記載せ板の移動を検知し信号を出力する液体残量検知装置において、前記載せ板の移動を検出する空圧式検出手段を設け、該検出手段からの検出信号を、爆発危険域から離隔した区域に設けた空圧作動スイッチに接続し、該作動スイッチの出力信号を作動させることで、電気的出力方式が可能となり、空気出力方式に比較して精度良く、より広範囲な出力形態を必要に応じて選択することができ、空気出力方式と同様安全な確認ができるので課題解決が達成できる。尚、ここで用いられる空気式検出手段は前述と同様近接センサ等が用いられる。
【0012】
【発明の実施の態様】以下、図面に基づいて本発明の実施例を例示的に詳しく説明する。但しこの実施例に記載されている構成部品の寸法、材質、形状、その相対配置などは特に特定的な記載がない限りは、この発明の範囲をそれのみに限定する趣旨ではなく単なる説明例に過ぎない。
【0013】
図1は本発明の一実施例に係る液体残量検知装置である。この実施例では容器は加圧式塗料タンクとしているがこれに限定されない。図1において床面に設置されたベース板1には塗料容器2を載せる載せ板3が設置され、支点4を中心にベース板1に固定された支柱5に付設されるばね6によって吊られている。塗料容器2は支点4とばね6の付設位置とのほぼ中間点で載せ板3に固定され、塗料容器2および載せ板3はばね6により片持ち支持される。尚、図による説明は省略するが片持ち支持に限定せず、容器や載せ板全体をばねで受け支える構成としても良いし、吊り下げる構成としても良い。またばねに関しても繰り返し荷重に対して復元性の有る弾性体で良くばねに限定しない。
【0014】
塗料容器内に塗料が十分にある場合は、塗料容器2と載せ板3などの重量はばね6の引っ張り力に打ち勝ち、塗料容器2を載せた載せ板3がベース板1に付設されたストッパー11に接し、静止するようになっている。即ちベース板1が荷重の一部を受けている状態となるので、ばね6を必要以上に強いばねにしなくとも良い。
【0015】
塗装作業が進み塗料が吸い上げ管15を通りスプレーガン(図示せず)などに供給され、塗料容器内の塗料が残り少なくなり、液面水位が下限(塗料の補充が必要な状態)になった時、塗料容器2と載せ板3がばね6の引っ張る力により持ち上げられるようにし、ばね6側の調整ねじ7により、ばねが引っ張る強さを予め調整しておく。尚この際、ベース板1と載せ板3との間に磁石等を用いた作動抵抗を付与すると、ばね力と荷重の中立による緩慢な動きを防ぐことができる。つまりばね6を若干強めに設定し液面水位が下限となった時、載せ板3が速やかに大きく変位するようにしている。
【0016】
そして液面水位が下限(塗料の補充が必要な状態)になった時、載せ板3がばね6の引っ張る力により持ち上げられ、載せ板3に設置された検知ノズル8の端面が支柱5に固定された空気式増圧器20の壁面9に設けられた補助空気の排出口10に接近または当接すると検知ノズル8が前記排出口10からの排出空気圧力を検知するようになっている。そして後述のようにこの圧力を空気式増圧器20の動作信号に利用する。尚、載せ板3がほぼ水平の状態で検知ノズル8の端面が前記排出口10に接近または当接するように検知ノズル8の上下位置は調節できるようになっている。また、本実施例では接近または当接する前、検知ノズル8の端面と前記排出口10とのスキマは2mm程度としている。
【0017】
ばね6の引っ張る力により一旦吊りあがった塗料容器2と載せ板3は必要以上に浮かないように支柱5には載せ板3のストッパー12が付設されている。そして塗料容器2に塗料を補充し、容器全体が重くなり、吊り上げるばね力より勝ると載せ板3は元の状態、即ち荷重の一部をベース板1が受け、静止する状態になる。つまり載せ板3は支点4を中心にストッパー12とストッパー11との間で上下移動することになる。
【0018】
ここで、図1に示された空気式増圧器20の動作説明を図2及び図3で行う。通常、被検出物の接近を検知する空気式の近接センサと空気式増圧器20は図2に示される様に、被検出物が、常時検出用微圧空気を先端から吐出している近接センサに接近すると、吐出が制限され背圧を受け、近接センサからの信号aの圧力が上昇し、空気式増圧器20が作動して空気圧力Pにより空気圧力Sが出力される。一方、空気式増圧器20は図2、図3に示すように動作補助空気Pxが空気式増圧器20に供給され、微量な空気(例えば0.1barで1.4L/min程度)が非動作時に排出口から常に排出されている。そして前記近接センサからの信号aを内部のダイアフラム23が受圧しノズル26をふさぎ、動作補助空気Pxの排出が停止されると、動作補助空気による内圧が上昇しダイアフラム24が押し上げられ、出力側のポペット弁25を開く構造になっている。
【0019】
図1で示された実施例の検知部分を図4を用いてより詳しく説明する。空気式増圧器20の動作補助空気Pxの排出口10の真下にスキマ26を隔て検知ノズル8の端面の中心が正面に位置している。液面水位が下限(塗料の補充が必要な状態)になった時、載せ板3がばね6の引っ張る力により持ち上げられ、載せ板3に設置された検知ノズル8の端面が支柱5に固定された圧力増圧器20に形成される前記排出口10に接近または当接するようになっている。
【0020】
本実施例では、前記動作補助空気Pxを排出口10に接近した検知ノズル8が受け、検出信号として空気チューブ27を通り空気式増圧器20の動作信号として働く。一方、動作補助空気Pxはエアユニット13内に設置された減圧弁28、空気フィルター29、流量調節弁30を介して供給される。出力用高圧空気Pは空気チューブ31により空気式増圧器20に供給され、出力Sが空気チューブ32に出力される。空気チューブ32の先端にはホイッスル33などの警笛を取り付け、液面水位が下限(塗料の補充が必要な状態)になった時、作業者に知らせるようになっている。
【0021】
このように図1に示す本発明の一実施例では前記動作補助空気の排出空気を信号圧力として利用している。即ち前記動作補助空気の排出口10にノズル8の端面が接近または当接すると、微圧(例えば0.1bar)を検知し、この信号圧力により空気式増圧器20が空気圧力Sを出力するよう構成されている。そして図3で示したように前記動作補助空気の排出がストップすると前記信号圧力がなくなりノズル26が開いて、空気圧式増圧器20からの高圧空気吐出は停止する。すると再び前記動作補助空気の排出が始まり空気式増圧器20を動作させるといったいわゆるフリップフロップ出力が得られる。
【0022】
このフリップフロップ出力をホイッスルに接続することによって、液面水位が下限(塗料の補充が必要な状態)になった時、作業者はホイッスルの断続警報音を聞くこととなる。尚、危険雰囲気から離れた場所で警報もしくは警告灯その他の出力をさせる場合には、チューブ等で前記出力空気を送り電気信号に変換することによって広範囲な出力形態が選択でき、自動制御への応用展開も図ることができる。
【0023】
図5に本発明の空気式検出手段における別の実施例を示す。吐出空気ノズル51に対峙して受圧ノズル52が設置され両者の中間に遮蔽版53が位置する。載せ板3の移動により遮蔽版53が吐出空気ノズル51より吐出する空気を遮ると受圧ノズル52が載せ板の移動を検出し、検出信号を出力するようになっている。図5に示すエアセンサはいわゆる対向形と呼ばれ、この他に背圧形、反射形、乱流形などが市販されておりこれらの空圧式検出手段を用いて本発明の目的を達成することができる。
【0024】
図6は請求項6、7、8に記載された本発明の一実施例で、検出部からの検出信号で非爆発危険区域に設けた無接点スイッチを作動させ電気信号が得られるようにしている。
【0025】
【発明の効果】
以上述べた通り、本発明によれば液体の残量検知手段が全て空気駆動式の機器で構成可能となるので、塗装現場における火災危険場所であっても安全に使用できる。またフリップフロップ出力による断続警報音のため連続音に比較して作業者に液面下限を知らしめ易く液体補充のタイミングを逃してしまうことがない。
【図面の簡単な説明】
【図1】図1は本発明の一実施例を示す構成図
【図2】図2は図1に示された空気検出手段の動作説明図
【図3】図3は図1に示された空気式増圧器の動作説明図
【図4】図4は図1で示された発明の検知部分の詳細説明図
【図5】図5は本発明の空気式検出手段の別の実施例を示す
【図6】図6は本発明手段からの検出信号を空圧作動スイッチに接続した実施例を示す
【符号の説明】
1、 ベース板
2、 塗料容器
3、 載せ板
4、 支点
5、 支柱
6、 ばね
7、 調整ねじ
8、 検知ノズル
9、 壁面
10、排出口
11 ストッパー
12 ストッパー
13 エアユニット
15 吸い上げ管
20 空気式増圧器
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detection of remaining amount in paint containers, pressurized containers, and other filling containers, and in particular, remaining liquid amounts in various containers disposed in places where there is a risk of flammable explosion where electricity cannot be used. The present invention relates to a detection device.
[0002]
2. Description of the Related Art As an example of a painting operation using a spray gun, a form in which paint stored in a pressurized paint tank is pressurized and supplied to a spray gun via a paint hose is often seen. Since it is stored in a sealed pressurized container, it cannot be seen from the outside, and the remaining amount of paint cannot be confirmed. In order to solve such problems, there has been a demand for means for detecting the remaining amount of paint in the container. However, since it is a sealed pressurized container, it is difficult to detect changes in physical quantities such as buoyancy and back pressure due to paint. It was. Further, since the remaining amount of flammable liquid such as paint is detected, it is necessary to eliminate the danger of fire, and it is not possible to simply use an electrical detection means.
[0003]
The present inventor previously received a load of a filling container that changes in proportion to the increase or decrease of the filling as a method not based on electrical detection in Japanese Patent No. 2895927 as a remaining amount detection device for flammable liquids such as paint. And a technique for detecting the remaining amount of filling in the container. In these techniques, the weight of the paint container in which the paint is accommodated is detected by a gas pressure generator that supports the paint container, and the generated pressure is continuously displayed on the pressure gauge.
[0004]
However, in the technique of the above publication, in order to convert a slight displacement of the pressure receiver attached to the gas pressure generator accompanying a change in weight into a gas pressure through a diaphragm, The followability to subtle weight changes is not sufficient, and there is a problem in the accuracy of detecting the liquid level position. Although the generated pressure is displayed on the pressure gauge, to confirm that the remaining amount is low, it is necessary for the operator to approach the range where the pressure gauge display can be seen. Since there is no way to know that the remaining amount is low unless the operator consciously and actively confirms it, there is a problem that the timing of liquid replenishment is sometimes missed. There has been a need for a device that can accurately detect and stably detect and accurately notify an operator.
[0005]
The present invention has been made in view of the above circumstances, and its purpose is to check the remaining amount with a simple structure, particularly at the lower limit of the liquid level, accurately and reliably, and excellent in handleability. The object is to obtain an inexpensive and safe residual liquid detection device.
[0006]
In order to solve such problems, the present invention supports a mounting plate on which a container containing a liquid is placed on an elastic body on a base plate installed on a floor surface. In the liquid remaining amount detection device that detects the movement of the mounting plate due to the change in weight due to the increase or decrease of the liquid and outputs a signal, if the liquid in the container is reduced by using the liquid, the weight of the entire container is reduced, so that the weight decreases. The mounting plate that has been balanced and stationary before is moved by the force of the elastic body. In order to detect this movement, a pneumatic detection means is provided. By providing means for outputting high-pressure air (for example, about 5 bar) in response to a detection signal from the detection means and alarm means for operating with the high-pressure air, the high-pressure air is used, for example, by sounding a horn to the operator. It is possible to notify that the remaining amount of liquid in the container is low.
[0007]
Further, the pneumatic detection means for detecting the movement is a proximity sensor that discharges detection air to the gap of the detection unit formed by the movement of the mounting plate and outputs a detection signal by back pressure fluctuation of the discharge air. The problem can be solved.
[0008]
Further, as another means, a discharge air nozzle and a detection unit having an air pressure receiving part are provided, and a shielding part is provided for flowing detection air and blocking the input to the pressure receiving part by the movement of the mounting plate against this flow. The problem can be solved in the same way.
[0009]
Further, the means for outputting high-pressure air is a pneumatic intensifier that outputs a high-pressure air by opening a high-pressure air valve by operating a diaphragm with the detection air when the detection air discharged to the detection unit is shut off, The detection air that is discharged to the detection unit uses the detection air that has flowed into the detection nozzle that is closer due to the movement of the mounting plate to input the detection signal that blocks the discharge of the detection air, so that the configuration is inexpensive and simple. The problem can be solved.
[0010]
Further, the problem can be solved by using a high-pressure air as a warning means.
[0011]
Further, on the base plate installed on the floor surface, a mounting plate on which a container containing liquid is placed is supported by an elastic body, and the movement of the mounting plate is detected by a change in weight due to increase or decrease of the liquid and a signal is output. In the liquid remaining amount detection device, a pneumatic detection means for detecting movement of the mounting plate is provided, and a detection signal from the detection means is connected to a pneumatic operation switch provided in an area separated from the explosion danger area, By activating the output signal of the operation switch, an electrical output method becomes possible, and a wider range of output modes can be selected as needed with higher accuracy than the air output method. The problem can be solved because it can be confirmed safely. Incidentally, as the pneumatic detection means used here, a proximity sensor or the like is used as described above.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Not too much.
[0013]
FIG. 1 is a liquid remaining amount detection apparatus according to an embodiment of the present invention. In this embodiment, the container is a pressurized paint tank, but is not limited thereto. In FIG. 1, a base plate 1 placed on the floor is provided with a mounting plate 3 on which a paint container 2 is placed, and is suspended by a spring 6 attached to a column 5 fixed to the base plate 1 around a fulcrum 4. Yes. The paint container 2 is fixed to the mounting plate 3 at a substantially intermediate point between the fulcrum 4 and the attachment position of the spring 6, and the paint container 2 and the mounting plate 3 are cantilevered by the spring 6. In addition, although description by a figure is abbreviate | omitted, it is not limited to cantilever support, It is good also as a structure which receives and supports the container and the whole mounting plate with a spring, and it is good also as a structure suspended. In addition, the spring may be an elastic body having a resilience against repeated loads, and is not limited to the spring.
[0014]
When there is sufficient paint in the paint container, the weight of the paint container 2 and the mounting plate 3 overcomes the pulling force of the spring 6, and the stopper 11 on which the mounting plate 3 on which the paint container 2 is placed is attached to the base plate 1. It comes in contact with and comes to rest. That is, since the base plate 1 receives a part of the load, the spring 6 does not have to be stronger than necessary.
[0015]
When the painting operation progresses and the paint passes through the suction pipe 15 and is supplied to a spray gun (not shown), etc., the paint in the paint container becomes low and the liquid level becomes the lower limit (a state where paint replenishment is required). The paint container 2 and the mounting plate 3 are lifted by the pulling force of the spring 6, and the spring pulling strength is adjusted in advance by the adjusting screw 7 on the spring 6 side. At this time, if an operating resistance using a magnet or the like is applied between the base plate 1 and the mounting plate 3, slow movement due to the neutral force of the spring force and the load can be prevented. That is, when the spring 6 is set to be slightly stronger and the liquid level becomes the lower limit, the mounting plate 3 is quickly displaced greatly.
[0016]
When the liquid level becomes the lower limit (the state where replenishment of paint is required), the mounting plate 3 is lifted by the pulling force of the spring 6, and the end surface of the detection nozzle 8 installed on the mounting plate 3 is fixed to the column 5. The detection nozzle 8 detects the discharge air pressure from the discharge port 10 when approaching or coming into contact with the auxiliary air discharge port 10 provided on the wall surface 9 of the pneumatic pressure intensifier 20. As will be described later, this pressure is used as an operation signal for the pneumatic intensifier 20. The vertical position of the detection nozzle 8 can be adjusted so that the end surface of the detection nozzle 8 approaches or comes into contact with the discharge port 10 while the mounting plate 3 is substantially horizontal. In this embodiment, before the approach or contact, the clearance between the end face of the detection nozzle 8 and the discharge port 10 is about 2 mm.
[0017]
A stopper 12 of the mounting plate 3 is attached to the support column 5 so that the paint container 2 and the mounting plate 3 that are once suspended by the pulling force of the spring 6 do not float more than necessary. Then, the paint container 2 is replenished with paint, and the entire container becomes heavier, and when it surpasses the lifting spring force, the placing plate 3 receives the original state, that is, the base plate 1 receives a part of the load and becomes stationary. That is, the mounting plate 3 moves up and down between the stopper 12 and the stopper 11 around the fulcrum 4.
[0018]
Here, the operation of the pneumatic pressure intensifier 20 shown in FIG. 1 will be described with reference to FIGS. Normally, as shown in FIG. 2, the air proximity sensor 20 and the air pressure intensifier 20 for detecting the approach of the detection object are proximity sensors in which the detection object always discharges the detection fine pressure air from the tip. , The discharge is restricted and the back pressure is received, the pressure of the signal a from the proximity sensor rises, the pneumatic pressure intensifier 20 is activated, and the air pressure P is output by the air pressure P. On the other hand, as shown in FIGS. 2 and 3, the air pressure intensifier 20 is supplied with the operation auxiliary air Px to the air pressure intensifier 20, and a very small amount of air (for example, about 1.4 L / min at 0.1 bar) is inoperative. Sometimes it is always discharged from the outlet. When the signal a from the proximity sensor is received by the internal diaphragm 23 to block the nozzle 26 and the discharge of the operation auxiliary air Px is stopped, the internal pressure due to the operation auxiliary air rises, the diaphragm 24 is pushed up, and the output side The poppet valve 25 is open.
[0019]
The detection part of the embodiment shown in FIG. 1 will be described in more detail with reference to FIG. The center of the end face of the detection nozzle 8 is located in front of the air pressure booster 20 with the clearance 26 just below the discharge port 10 of the operation auxiliary air Px. When the liquid level becomes the lower limit (the state where replenishment of paint is required), the mounting plate 3 is lifted by the pulling force of the spring 6, and the end surface of the detection nozzle 8 installed on the mounting plate 3 is fixed to the column 5. The pressure intensifier 20 approaches or comes into contact with the discharge port 10.
[0020]
In the present embodiment, the operation assisting air Px is received by the detection nozzle 8 approaching the discharge port 10 and passes through the air tube 27 as a detection signal and functions as an operation signal of the pneumatic pressure intensifier 20. On the other hand, the operation auxiliary air Px is supplied through a pressure reducing valve 28, an air filter 29, and a flow rate adjusting valve 30 installed in the air unit 13. The high pressure air P for output is supplied to the pneumatic intensifier 20 through the air tube 31, and the output S is output to the air tube 32. A whistle 33 or the like is attached to the tip of the air tube 32 so that the operator is informed when the liquid level is at the lower limit (a state in which replenishment of paint is required).
[0021]
As described above, in the embodiment of the present invention shown in FIG. 1, the exhaust air of the operation auxiliary air is used as the signal pressure. That is, when the end face of the nozzle 8 approaches or comes into contact with the discharge port 10 for the operation auxiliary air, a fine pressure (for example, 0.1 bar) is detected, and the pneumatic pressure intensifier 20 outputs the air pressure S by this signal pressure. It is configured. Then, as shown in FIG. 3, when the discharge of the operation auxiliary air is stopped, the signal pressure disappears, the nozzle 26 is opened, and the high-pressure air discharge from the pneumatic pressure intensifier 20 is stopped. Then, the so-called flip-flop output is obtained such that the operation auxiliary air is discharged again and the pneumatic pressure intensifier 20 is operated.
[0022]
By connecting this flip-flop output to the whistle, the operator will hear a whistle intermittent alarm sound when the liquid level becomes the lower limit (a state where paint replenishment is required). Note that when outputting alarms, warning lights, or other outputs away from hazardous atmospheres, a wide range of output modes can be selected by sending the output air through a tube or the like and converting it into an electrical signal. Deployment can also be achieved.
[0023]
FIG. 5 shows another embodiment of the pneumatic detection means of the present invention. A pressure receiving nozzle 52 is installed opposite to the discharge air nozzle 51, and a shielding plate 53 is located between them. When the shielding plate 53 blocks the air discharged from the discharge air nozzle 51 by the movement of the mounting plate 3, the pressure receiving nozzle 52 detects the movement of the mounting plate and outputs a detection signal. The air sensor shown in FIG. 5 is called a so-called opposed type, and other types such as a back pressure type, a reflection type, and a turbulent type are commercially available, and these pneumatic detection means can be used to achieve the object of the present invention. it can.
[0024]
FIG. 6 shows an embodiment of the present invention as set forth in claims 6, 7, and 8, in which an electrical signal is obtained by operating a contactless switch provided in a non-explosion danger area by a detection signal from a detection unit. Yes.
[0025]
【The invention's effect】
As described above, according to the present invention, all of the liquid remaining amount detecting means can be constituted by air-driven equipment, and therefore, it can be used safely even in a fire danger place at the painting site. Further, because of the intermittent alarm sound generated by the flip-flop output, it is easier to let the operator know the lower limit of the liquid level compared to the continuous sound, and the timing of liquid replenishment is not missed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a diagram for explaining the operation of air detection means shown in FIG. 1. FIG. 3 is shown in FIG. FIG. 4 is a detailed explanatory view of the detection part of the invention shown in FIG. 1. FIG. 5 is a diagram showing another embodiment of the pneumatic detection means of the present invention. FIG. 6 shows an embodiment in which a detection signal from the means of the present invention is connected to a pneumatic operation switch.
1, base plate 2, paint container 3, mounting plate 4, fulcrum 5, support column 6, spring 7, adjustment screw 8, detection nozzle 9, wall surface 10, discharge port 11 stopper 12 stopper 13 air unit 15 suction pipe 20 pneumatic increase Pressure device

Claims (8)

床面に設置されたベース板の上で、液体を収容した容器を載せた載せ板を弾性体で支持し、液体の増減に伴う重量変化による前記載せ板の移動を検知し信号を出力する液体残量検知装置において、前記載せ板の移動を検出する空圧式検出手段を設け、該検出手段からの検出信号による高圧空気出力手段と、該高圧空気により作動する警報手段とを有することを特徴とする液体残量検知装置。A liquid that supports a mounting plate on which a container containing liquid is placed on a base plate installed on the floor with an elastic body, detects the movement of the mounting plate due to a change in weight due to increase or decrease of the liquid, and outputs a signal The remaining amount detecting device is provided with pneumatic detection means for detecting movement of the mounting plate, and has high-pressure air output means based on a detection signal from the detection means, and alarm means operated by the high-pressure air. Liquid remaining amount detecting device. 移動を検出する空圧式検出手段が、前記載せ板の移動により形成される検出部のスキマに、検出空気を吐出し、該吐出空気の背圧変動により検出信号を出力する近接センサである請求項1記載の液体残量検知装置。The pneumatic detection means for detecting movement is a proximity sensor that discharges detection air to a gap of a detection portion formed by movement of the mounting plate and outputs a detection signal by back pressure fluctuation of the discharge air. The liquid remaining amount detection apparatus according to 1. 移動を検出する空圧式検出手段が、吐出空気ノズルと空気受圧部を有する検出部と、前記載せ板の移動により前記受圧部への入力を遮断する遮蔽部からなる請求項1記載の液体残量検知装置。The remaining amount of liquid according to claim 1, wherein the pneumatic detection means for detecting movement includes a detection unit having a discharge air nozzle and an air pressure receiving unit, and a shielding unit for blocking input to the pressure receiving unit by movement of the mounting plate. Detection device. 前記高圧空気出力手段が微圧の検出空気圧によりダイアフラムを作動させて高圧空気バルブを開いて高圧空気を出力する空気式増圧器とし、前記空圧式検出手段が前記載せ板が移動すると該空気式増圧器からの排気を該空気式増圧器への検出信号とする請求項1記載の液体残量検知装置。The high-pressure air output means is a pneumatic intensifier that operates a diaphragm with a detection air pressure of a small pressure to open a high-pressure air valve and outputs high-pressure air. When the pneumatic detection means moves the mounting plate, 2. The liquid remaining amount detecting device according to claim 1, wherein the exhaust from the pressure device is used as a detection signal to the pneumatic pressure intensifier. 警報手段が高圧空気で警笛を鳴らすことを特徴とする請求項1乃至4に記載の液体残量検知装置。5. The liquid remaining amount detecting device according to claim 1, wherein the alarm means sounds a horn with high-pressure air. 床面に設置されたベース板の上で、液体を収容した容器を載せた載せ板を弾性体で支持し、液体の増減に伴う重量変化による前記載せ板の移動を検知し信号を出力する液体残量検知装置において、前記載せ板の移動を検出する空圧式検出手段を設け、該検出手段からの検出信号を、爆発危険域から離隔した区域に設けた空圧作動スイッチに接続し、該作動スイッチの出力信号を出力させることを特徴とする液体残量検知装置。A liquid that supports a mounting plate on which a container containing liquid is placed on a base plate installed on the floor with an elastic body, detects the movement of the mounting plate due to a change in weight due to increase or decrease of the liquid, and outputs a signal In the remaining amount detection device, a pneumatic detection means for detecting movement of the mounting plate is provided, and a detection signal from the detection means is connected to a pneumatic operation switch provided in an area separated from the explosion danger area, A liquid remaining amount detection device that outputs an output signal of a switch. 移動を検出する空圧式検出手段が、前記載せ板の移動により形成される検出部のスキマに、検出空気を吐出し、該吐出空気の背圧変動により検出信号を出力する近接センサである請求項6記載の液体残量検知装置。The pneumatic detection means for detecting movement is a proximity sensor that discharges detection air to a gap of a detection portion formed by movement of the mounting plate and outputs a detection signal by back pressure fluctuation of the discharge air. 6. A liquid remaining amount detecting device according to 6. 移動を検出する空圧式検出手段が、吐出空気ノズルと空気受圧部を有する検出部と、前記載せ板の移動により前記受圧部への入力を遮断する遮蔽部からなる請求項6記載の液体残量検知装置。The residual liquid amount according to claim 6, wherein the pneumatic detection means for detecting movement comprises a detection unit having a discharge air nozzle and an air pressure receiving unit, and a shielding unit for blocking input to the pressure receiving unit by movement of the mounting plate. Detection device.
JP2003172524A 2003-06-17 2003-06-17 Apparatus for detecting remaining quantity of liquid Pending JP2005009939A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8132456B2 (en) 2009-05-05 2012-03-13 Deere & Company Fuel level indicator for riding lawn equipment
CN115265729A (en) * 2020-09-30 2022-11-01 南京中科煜宸激光技术有限公司 Fine detection balancing device for weight of large-powder-amount storage bin for additive manufacturing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8132456B2 (en) 2009-05-05 2012-03-13 Deere & Company Fuel level indicator for riding lawn equipment
CN115265729A (en) * 2020-09-30 2022-11-01 南京中科煜宸激光技术有限公司 Fine detection balancing device for weight of large-powder-amount storage bin for additive manufacturing
CN115265729B (en) * 2020-09-30 2023-10-03 南京中科煜宸激光技术有限公司 Fine detection balancing device for material bin weight of large-powder-amount material bin for additive manufacturing

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