JPH0647092B2 - Drip prevention device - Google Patents
Drip prevention deviceInfo
- Publication number
- JPH0647092B2 JPH0647092B2 JP1219571A JP21957189A JPH0647092B2 JP H0647092 B2 JPH0647092 B2 JP H0647092B2 JP 1219571 A JP1219571 A JP 1219571A JP 21957189 A JP21957189 A JP 21957189A JP H0647092 B2 JPH0647092 B2 JP H0647092B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- diaphragm
- pressure
- ejected
- suction
- 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.)
- Expired - Lifetime
Links
Landscapes
- Coating Apparatus (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、試薬等の被吐出液体が下向きに開口したノズ
ルから吐出される場合において、被吐出液体の吐出を停
止したときに被吐出液体をノズル内に吸引することによ
り、吐出停止後に被吐出液体が滴下するのを防止するよ
うにした液だれ防止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle for ejecting a liquid to be ejected when a liquid to be ejected such as a reagent is ejected from a nozzle opened downward, when the ejection of the liquid to be ejected is stopped. The present invention relates to a dripping prevention device that prevents the liquid to be discharged from dropping after being stopped by sucking the liquid inside.
従来の技術及び発明が解決しようとする問題点 従来、このような液だれ防止装置として、ノズルの手前
の流通路に、被吐出液体が流通する流通室の容積がその
流通室とダイヤフラムによつて区画された圧力室に供給
されるパイロツト流体の圧力によつて増減する吸引弁を
介設し、その吸引弁の流通室の容積の増大により被吐出
液体の圧送停止後のノズル内の被吐出液体を吸引して液
だれを防止する装置があるが、パイロツト流体の増減に
より吸引弁内のダイヤフラムの動きをコントロールする
オープン制御であつて、吸引量を直接に測ることができ
ないため、吸引量の設定や調整のためには吸引弁自体を
試行錯誤的に調節する必要があつて、正確な設定を行う
には長時間を要する欠点があつた。Problems to be Solved by the Related Art and Invention Conventionally, as such a liquid drip prevention device, in the flow passage in front of the nozzle, the volume of the flow chamber in which the liquid to be discharged flows is defined by the flow chamber and the diaphragm. A suction valve that increases or decreases depending on the pressure of the pilot fluid supplied to the partitioned pressure chambers is provided, and the volume of the flow chamber of the suction valve increases, so that the liquid to be discharged in the nozzle after the pressure feed of the liquid to be discharged is stopped Although there is a device that sucks the liquid to prevent dripping, it is an open control that controls the movement of the diaphragm inside the suction valve by increasing or decreasing the pilot fluid, and the suction amount cannot be directly measured. It is necessary to adjust the suction valve itself by trial and error for adjustment and adjustment, and it takes a long time to make accurate setting.
問題点を解決するための手段 本発明はこのような問題点を解決するための手段とし
て、被吐出液体の吸引量を設定するデータ設定装置と、
ダイヤフラムの変形量を検出する検出装置と、データ設
定装置の設定信号と検出装置の検出信号とを比較して演
算する演算装置と、パイロツト流体の圧力を制御するサ
ーボ弁と、そのサーボ弁に演算装置の演算結果を入力す
る指令装置とを設けた構成とした。Means for Solving Problems As a means for solving such problems, the present invention is a data setting device for setting the suction amount of a liquid to be ejected,
A detection device that detects the amount of deformation of the diaphragm, a calculation device that calculates by comparing the setting signal of the data setting device with the detection signal of the detection device, a servo valve that controls the pressure of the pilot fluid, and a calculation for that servo valve. A command device for inputting the calculation result of the device is provided.
発明の作用及び効果 本発明は上記構成になり、ダイヤフラムの実際の変形量
を検出し、これを演算装置にフイードバツクして設定値
と比較演算し、検出値が設定値に近づくように指令装置
によつてサーボ弁を制御するようにしたから、吸引量を
所望の値に自動的に保つことができ、また、遠隔制御が
可能になつて作業性が著しく向上する効果がある。The operation and effect of the present invention has the above-mentioned configuration, detects the actual deformation amount of the diaphragm, and feeds this back to the arithmetic unit to perform a comparison operation with the set value, and to the command device so that the detected value approaches the set value. Therefore, since the servo valve is controlled, the suction amount can be automatically maintained at a desired value, and remote control can be performed, so that workability is significantly improved.
実施例 以下、本発明の一実施例を添付図面に基づいて説明す
る。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図において、１は所望の吸引量及び吸引時間をキー
入力によるデジタル値またはダイヤル入力によるアナロ
グ値として設定するデータ設定装置であつて、その設定
値は演算装置２に入力されて後記する検出装置８からフ
イードバツクされた吸引弁６の吸引量及び吸引時間のデ
ータと比較演算される。なお、データ設定装置１への入
力がダイヤル入力によるアナログ値である場合にはデジ
タル値に変換されて演算が行われる。演算装置２で比較
演算された結果は指令装置３へ入力され、後記する電空
比例弁５への供給電圧及びその供給時間に対応するデジ
タル値が出力される。このデジタル・アナログ変換器４
によりアナログ値に変換されて電空比例弁５に入力さ
れ、入力電圧に対応する圧力のパイロツトエアが電圧印
加時間に対応する時間だけ吸引弁６に供給され、被吐出
液体の供給源１０の供給停止後、パイロツトエアの圧力
変動に対応する量の吸引がその変動時間に対応する時間
だけノズル７において行われる。この吸引弁６の吸引は
後述するダイヤフラム１６の変動によつて行われるので
あつて、その変形量及び変形に要する時間が検出装置８
によりアナログ値として検知され、これがアナログ・デ
ジタル変換器９によりデジタル値として演算装置２に入
力される。In FIG. 1, reference numeral 1 denotes a data setting device for setting a desired suction amount and suction time as a digital value by key input or an analog value by dial input, and the set value is input to a computing device 2 to detect it later. It is compared with the data of the suction amount and suction time of the suction valve 6 fed back from the device 8. When the input to the data setting device 1 is an analog value by dial input, it is converted into a digital value and calculation is performed. The result of the comparison calculation by the arithmetic unit 2 is input to the command unit 3, and a digital value corresponding to the supply voltage to the electropneumatic proportional valve 5 and its supply time, which will be described later, is output. This digital-analog converter 4
Is converted into an analog value and input to the electropneumatic proportional valve 5, the pilot air having a pressure corresponding to the input voltage is supplied to the suction valve 6 for a time corresponding to the voltage application time, and the supply source 10 of the liquid to be discharged is supplied. After the stop, suction of an amount corresponding to the pressure fluctuation of the pilot air is performed in the nozzle 7 for a time corresponding to the fluctuation time. The suction of the suction valve 6 is performed by the fluctuation of the diaphragm 16 described later, and the amount of deformation and the time required for the deformation are detected by the detection device 8.
Is detected as an analog value by the analog / digital converter 9 and is input to the arithmetic unit 2 as a digital value.
本実施例の吸引弁６は第２図に示すように、本体１３の
流入口１４と流出口１５との間に、上面が第１のダイヤ
フラム１６によつて気密に仕切られた流通室１８を形成
したものであつて、流入口１４は被吐出液体の供給源１
０に、流出口１５はノズル７に夫々接続されており、こ
の第１のダイヤフラム１６の上方に形成された収容室１
９内に、下端面をダイヤフラム１６に当接した昇降杆２
０が配置され、その上部の小径部２１に２枚の円板２
３、２４が第２のダイヤフラム２６を挟んで嵌着され、
小径部２１の突出部２２をかしめ付けることにより円板
２３、２４と第２のダイヤフラム２６が昇降杆２０に一
体的に固着されており、第２のダイヤフラム２６の周縁
部はボデイ１３に被着したカバー２５によつて押さえ付
けられて第２のダイヤフラム２６とカバー２５の間に圧
力室３４が構成され、収容室１９の下側の段部２７と下
側の円板２４の間にはコイルばね２８が装着されていて
第２のダイヤフラム２６を上方へ付勢しており、収容室
１９は通気孔２９により外気に連通している。カバー２
５には偏心位置に電空比例弁５の空気供給口に接続され
るパイロツトエアポート３０が形成されているととも
に、中心位置に形成された透孔３１の周りに検出装置８
である直動型ポテンシヨメータが圧力室３４内の空気が
漏出しないように気密に取り付けられていて、検知ピン
３３が透孔３１を通つて昇降杆２０の小径部２１の突出
部２２に当接している。As shown in FIG. 2, the suction valve 6 of this embodiment has a flow chamber 18 whose upper surface is airtightly partitioned by a first diaphragm 16 between an inlet 14 and an outlet 15 of a main body 13. The inflow port 14 is formed by the supply source 1 of the liquid to be ejected.
0, the outlets 15 are connected to the nozzles 7, respectively, and the storage chamber 1 formed above the first diaphragm 16
9 has an elevating rod 2 whose lower end surface is in contact with the diaphragm 16.
0 is arranged, and two discs 2 are provided in the small diameter portion 21 on the upper side.
3, 24 are fitted with the second diaphragm 26 sandwiched therebetween,
The discs 23 and 24 and the second diaphragm 26 are integrally fixed to the elevating rod 20 by caulking the protruding portion 22 of the small diameter portion 21, and the peripheral edge portion of the second diaphragm 26 is attached to the body 13. A pressure chamber 34 is formed between the second diaphragm 26 and the cover 25 by being pressed by the cover 25, and a coil is provided between the lower step portion 27 of the storage chamber 19 and the lower disk 24. A spring 28 is attached to urge the second diaphragm 26 upward, and the storage chamber 19 communicates with the outside air through a ventilation hole 29. Cover 2
5, a pilot air port 30 connected to the air supply port of the electropneumatic proportional valve 5 is formed at the eccentric position, and the detection device 8 is provided around the through hole 31 formed at the center position.
The direct-acting potentiometer which is the air-tight type is attached airtightly so that the air in the pressure chamber 34 does not leak out, and the detection pin 33 passes through the through hole 31 and hits the protruding portion 22 of the small diameter portion 21 of the elevating rod 20. Touching.
次に、本実施例の作動を説明すると、被吐出液体の供給
中は電空比例弁５からパイロツトエアポート３０に供給
される圧力室３４の圧力が高く、第２のダイヤフラム２
６がコイルばね２８を弾縮させて第２図に鎖線で示す下
方位置にあり、昇降杆２０により一体的に作動する第１
のダイヤフラム１６も同じく鎖線で示す下方位置にあつ
て、流通室１８の容積が小さくなつており、被吐出液体
の供給源１０が閉じてノズル７からの吐出が停止する
と、電空比例弁５のパイロツトエアの吐出圧力が一定値
だけ一定時間かかつて低減され、圧力室３４内の圧力が
低下して第２のダイヤフラム２６及び昇降杆２０ととも
に第１のダイヤフラム１６が図に実線で示すように上昇
し、流通室１８の容積が増大してノズル７内の被吐出液
体が吸引されるのであつて、この際の第１のダイヤフラ
ム１６の変形は昇降杆２０の上下動と対応するのであ
り、これを検出装置８である直動型ポテンシヨメータの
検知ピン３３の動きとして検知し、既述のように、その
変動量と変動時間が演算装置２にフイードバツクされ、
データ設定装置１に入力された設定値と比較されてその
差が零になるように演算された値が指令装置３に入力さ
れ、その指令装置により電空比例弁５が制御されて昇降
杆２０の変動すなわち第１のダイヤフラム１６の変形が
設定装置１の入力値に一致するように自動的に制御され
る。Next, the operation of this embodiment will be described. During the supply of the liquid to be ejected, the pressure of the pressure chamber 34 supplied from the electropneumatic proportional valve 5 to the pilot air port 30 is high, and the second diaphragm 2 is operated.
6 is at the lower position shown by the chain line in FIG. 2 by elastically contracting the coil spring 28, and is operated integrally by the lifting rod 20.
The diaphragm 16 is also at the lower position shown by the chain line, and the volume of the flow chamber 18 is small. When the supply source 10 of the liquid to be discharged is closed and the discharge from the nozzle 7 is stopped, the electropneumatic proportional valve 5 The discharge pressure of the pilot air is once reduced by a certain value for a certain period of time, and the pressure in the pressure chamber 34 decreases, so that the first diaphragm 16 rises together with the second diaphragm 26 and the lifting rod 20 as shown by the solid line in the figure. However, since the volume of the flow chamber 18 increases and the liquid to be ejected inside the nozzle 7 is sucked, the deformation of the first diaphragm 16 at this time corresponds to the vertical movement of the elevating rod 20. Is detected as the movement of the detection pin 33 of the direct-acting potentiometer which is the detection device 8, and as described above, the variation amount and the variation time are fed back to the computing device 2,
A value that is compared with the set value input to the data setting device 1 and is calculated so that the difference becomes zero is input to the command device 3, and the command device controls the electropneumatic proportional valve 5 to move the lifting rod 20. , That is, the deformation of the first diaphragm 16 is automatically controlled so as to match the input value of the setting device 1.
第１図は本発明の一実施例のブロツク図、第２図は吸引
弁の断面図である。 １：データ設定装置、２：演算装置、３：指令装置、
５：電空比例弁（サーボ弁）、６：吸引弁、７：ノズ
ル、８：検出装置、１０：被吐出液体の供給源、１４：
流入口、１５：流出口、１６：第１のダイヤフラム、１
８：流通室、２０：昇降杆、２６：第２のダイヤフラ
ム、３３：検出ピン、３４：圧力室FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a sectional view of a suction valve. 1: data setting device, 2: arithmetic device, 3: command device,
5: Electropneumatic proportional valve (servo valve), 6: Suction valve, 7: Nozzle, 8: Detection device, 10: Supply source of discharged liquid, 14:
Inlet, 15: outlet, 16: first diaphragm, 1
8: Distribution chamber, 20: Lifting rod, 26: Second diaphragm, 33: Detection pin, 34: Pressure chamber
Claims (1)
ズルとの間に、被吐出液体が流通する流通室の容積が該
流通室とダイヤフラムによつて区画された圧力室に供給
されるパイロツト流体の圧力によつて増減する吸引弁を
介設し、該吸引弁の前記流通室の容積の増大により被吐
出液体の圧送停止後の前記ノズル内の被吐出液体を吸引
して液だれを防止する装置において、 前記被吐出液体の吸引量を設定するデータ設定装置と、
前記ダイヤフラムの変形量を検出する検出装置と、前記
データ設定装置の設定信号と前記検出装置の検出信号と
を比較して演算する演算装置と、前記パイロツト流体の
圧力を制御するサーボ弁と、該サーボ弁に前記演算装置
の演算結果を入力する指令装置とを設けたことを特徴と
する液だれ防止装置1. A volume of a flow chamber in which the liquid to be discharged flows is supplied to a pressure chamber defined by a diaphragm and the flow chamber between the pressure-feeding source of the liquid to be discharged and a nozzle opening downward. A suction valve that increases or decreases depending on the pressure of the pilot fluid is provided, and the volume of the flow chamber of the suction valve increases, so that the liquid to be ejected in the nozzle after the pumping of the liquid to be ejected is stopped to drip In the device for preventing, a data setting device for setting the suction amount of the liquid to be ejected,
A detection device that detects the deformation amount of the diaphragm, a calculation device that calculates by comparing the setting signal of the data setting device and the detection signal of the detection device, a servo valve that controls the pressure of the pilot fluid, A dripping prevention device characterized in that a servo valve is provided with a command device for inputting a calculation result of the calculation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1219571A JPH0647092B2 (en) | 1989-08-25 | 1989-08-25 | Drip prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1219571A JPH0647092B2 (en) | 1989-08-25 | 1989-08-25 | Drip prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0380961A JPH0380961A (en) | 1991-04-05 |
| JPH0647092B2 true JPH0647092B2 (en) | 1994-06-22 |
Family
ID=16737601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1219571A Expired - Lifetime JPH0647092B2 (en) | 1989-08-25 | 1989-08-25 | Drip prevention device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0647092B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08324478A (en) * | 1995-06-03 | 1996-12-10 | Makoto Onoyama | Bicycle |
| US7143956B2 (en) | 2003-07-07 | 2006-12-05 | Smc Kabushiki Kaisha | Suck back valve |
| DE10309112B4 (en) * | 2002-03-06 | 2013-03-14 | Smc K.K. | suck back |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006010037A (en) * | 2004-06-29 | 2006-01-12 | Smc Corp | Suck back valve |
-
1989
- 1989-08-25 JP JP1219571A patent/JPH0647092B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08324478A (en) * | 1995-06-03 | 1996-12-10 | Makoto Onoyama | Bicycle |
| DE10309112B4 (en) * | 2002-03-06 | 2013-03-14 | Smc K.K. | suck back |
| US7143956B2 (en) | 2003-07-07 | 2006-12-05 | Smc Kabushiki Kaisha | Suck back valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0380961A (en) | 1991-04-05 |
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