JPH0368740B2 - - Google Patents
Info
- Publication number
- JPH0368740B2 JPH0368740B2 JP19898384A JP19898384A JPH0368740B2 JP H0368740 B2 JPH0368740 B2 JP H0368740B2 JP 19898384 A JP19898384 A JP 19898384A JP 19898384 A JP19898384 A JP 19898384A JP H0368740 B2 JPH0368740 B2 JP H0368740B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- liquid
- valve
- pipe line
- control valve
- 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
Links
- 239000007788 liquid Substances 0.000 claims description 29
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、液体をノズルから吐出させて塗布す
るのに用いられる液体吐出装置における液体の飛
出し防止装置に関し、特にシール剤や接着剤また
は塗料のような高粘度液体を塗布する場合に利用
される。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for preventing liquid from splashing out in a liquid discharging device used to apply liquid by discharging it from a nozzle, and particularly to a device for preventing liquid from splashing out from a sealant, adhesive, or Used when applying high viscosity liquids such as paint.
（従来技術及び問題点）
第３図は液体吐出装置の概略を示すもので、液
体を圧送する圧送装置１と、この圧送装置１に接
続された管路２と、管路２の途中に接続された減
圧装置３と、管路２の先端部に接続された開閉バ
ルブ４及び吐出ノズル５とより構成されている。
圧送装置１は、例えば、空気圧シリンダ１ａによ
つて往復駆動されるポンプ１ｂで、タンク１ｃ内
の液体Ｑを150乃至200Kg／cm2程度の圧力で圧送す
るものである。減圧装置３はこれを30乃至80Kg／
cm2程度に減圧する。管路２には圧力を監視するた
めの圧力計６ａ，６ｂ，６ｃがそれぞれＰ１，Ｐ
２，Ｐ３の位置に設けてある。(Prior Art and Problems) Fig. 3 schematically shows a liquid discharging device, which includes a pressure feeding device 1 that pumps liquid, a pipe line 2 connected to this pressure feeding device 1, and a connection in the middle of the pipe line 2. It is comprised of a pressure reducing device 3, an on-off valve 4 connected to the tip of a pipe line 2, and a discharge nozzle 5.
The pressure-feeding device 1 is, for example, a pump 1b that is reciprocated by a pneumatic cylinder 1a, and is configured to force-feed the liquid Q in the tank 1c at a pressure of about 150 to 200 kg/cm 2 . The pressure reducing device 3 removes this from 30 to 80 kg/
Reduce the pressure to about cm 2 . In the pipe line 2, pressure gauges 6a, 6b, and 6c for monitoring pressure are installed at P1 and P, respectively.
2, is provided at position P3.
この液体吐出装置を使用して、吐出ノズル５か
ら吐出される液体の塗布作業を行う場合に、開閉
バルブ４を開いた瞬間に吐出ノズル５から多量の
液体が飛出して吐出し、塗布面の塗布状態を乱す
ことが起こる。この現象を第２図Ｂで説明する
と、同図において実線は非吐出時すなわち開閉バ
ルブ４が閉じているときの、破線は吐出時すなわ
ち開閉バルブ４が開いているときの、それぞれ圧
力状態を示している。この図でわかるように、吐
出ノズル５付近の圧力が、非吐出時と吐出時とで
は大きな差があり、この大きな差圧ΔPによつて
液体の飛出しが起こるのである。また、このよう
な大きな差圧ΔPがあると、例えば塗布用のガン
を用いて手操作を行う場合に、ガンのトリガーの
操作（開閉バルブ４の開閉）が行いにくく、ま
た、ガンに接続されたホースに高圧が作用してホ
ースが剛性化してしまうなど、圧力変化によるホ
ースの変形や反動によつてガンによる塗布位置を
正確に保持することが困難となる。 When using this liquid discharging device to apply liquid discharged from the discharge nozzle 5, a large amount of liquid will fly out and be discharged from the discharge nozzle 5 the moment the on-off valve 4 is opened, and the coating surface will be coated. Disturbing the coating condition may occur. This phenomenon can be explained with reference to FIG. 2B. In the same figure, the solid line shows the pressure state when no discharge is being performed, that is, when the on-off valve 4 is closed, and the broken line is the pressure state during discharging, that is, when the on-off valve 4 is open. ing. As can be seen from this figure, there is a large difference in the pressure near the discharge nozzle 5 between the non-discharge time and the discharge time, and this large differential pressure ΔP causes the liquid to splash out. In addition, if there is such a large differential pressure ΔP, for example, when manually operating a coating gun, it is difficult to operate the trigger of the gun (opening/closing the on-off valve 4). High pressure acts on the hose, causing it to become rigid, making it difficult to accurately maintain the application position with the gun due to deformation and reaction of the hose due to pressure changes.
従来は、このような飛出しを防止するために、
開閉バルブ４を操作するレバーに検知スイツチを
設け、開閉バルブ４を閉じた場合にこの検知スイ
ツチの信号によつてポンプ１ｂの作動を停止させ
たり、または開閉バルブ４を電磁的に開閉すると
ともに同時にポンプ１ｂの作動を停止させてい
た。しかし、この従来の方法によると、ポンプ１
ｂを頻繁に起動することとなるので傷みやすいと
ともに、起動時に吐出ノズル５から液体が吐出す
るまでに若干の時間遅れが生じるという欠点があ
る。 Conventionally, in order to prevent such protrusion,
A detection switch is provided on the lever that operates the on-off valve 4, and when the on-off valve 4 is closed, the operation of the pump 1b is stopped by a signal from this detection switch, or the on-off valve 4 is opened and closed electromagnetically and at the same time. The operation of pump 1b had been stopped. However, according to this conventional method, the pump 1
Since the device b is activated frequently, it is easily damaged, and there is also a disadvantage that there is a slight time delay before the liquid is ejected from the ejection nozzle 5 at the time of activation.
（問題点を解決するための手段）
本発明は上述の欠点を解消するために成された
もので、ポンプを停止させることなく、比較的簡
単な構成で液体の飛出しを防止することを目的と
しており、そのために本発明は、前記開閉バルブ
の上流側に管路内の液体の圧力を検知する圧力検
知器を、該圧力検知器の上流側に該管路を開閉す
る制御バルブを、それぞれ設け、前記圧力検知器
が通常吐出時の圧力よりも一定値以上高い圧力又
は一定値以上低い圧力を検知すれば前記制御バル
ブを閉じ又は開くように制御したものである。(Means for Solving the Problems) The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to prevent liquid from spilling out with a relatively simple configuration without stopping the pump. For this purpose, the present invention includes a pressure sensor for detecting the pressure of the liquid in the pipe line upstream of the opening/closing valve, and a control valve for opening and closing the pipe line upstream of the pressure sensor. The control valve is controlled to close or open if the pressure sensor detects a pressure higher than a certain value or a pressure lower than a certain value than the pressure at the time of normal discharge.
（実施例）
以下、本発明を実施例によつて図面を参照しな
がら説明する。(Example) Hereinafter, the present invention will be described by way of an example with reference to the drawings.
第１図において、第３図で説明したと同一の機
能を有するものについては同一の符号を付して説
明を省略する。管路２には、Ｐ１，Ｐ２，Ｐ３の
位置に圧力計７ａ，７ｂ，７ｃがそれぞれ設けら
れており、また、圧力計７ｃの上流側一定距離の
位置で減圧装置３の下流側近傍に電磁的に開閉さ
れる制御バルブ８が挿入されている。圧力計７ｃ
はある圧力範囲の上限値又は下限値を越えると信
号を出力するように圧力設定が可能であつて、出
力信号は制御装置９に入力され、またこの制御装
置９の出力によつて制御バルブ８が開閉されるよ
うに接続されている。 In FIG. 1, parts having the same functions as those explained in FIG. 3 are designated by the same reference numerals, and the explanation thereof will be omitted. The pipe line 2 is provided with pressure gauges 7a, 7b, and 7c at positions P1, P2, and P3, respectively, and an electromagnetic sensor is installed near the downstream side of the pressure reducing device 3 at a position a certain distance upstream of the pressure gauge 7c. A control valve 8 that is opened and closed automatically is inserted. Pressure gauge 7c
The pressure can be set so that a signal is output when the upper limit or lower limit of a certain pressure range is exceeded, and the output signal is input to the control device 9, and the output of the control device 9 causes the control valve 8 is connected so that it can be opened and closed.
制御装置９は、圧力計７ｃが上限値を検知すれ
ば制御バルブ８を閉じて且つその状態を保持しつ
づけ、下限値を検知すれば制御バルブ８を開いて
且つその状態を保持するようになつている。つま
り圧力計７ｃは、開閉バルブ４及び制御バルブ８
が開いて圧送装置１から圧送される液体が管路２
を流通し、吐出ノズル５から定常的に吐出されて
いる状態における圧力を中心にしてプラスマイナ
スＤの値が前述の上限値又は下限値になるように
設定されている。このＤの値は、使用する液体の
粘性特性又は塗布要求値（ビード形状、吐出量）
等によつて実験的に求めるとよいが、通常、数
Kg／cm2乃至十数Kg／cm2の範囲、例えば５Kg／cm2の
値が選ばれる。ただし、上限と下限の幅は同一で
なくてもよく、また下限の幅は圧力計７ｃの位置
によつて変化する。 The control device 9 closes the control valve 8 and maintains that state when the pressure gauge 7c detects the upper limit value, and opens the control valve 8 and maintains that state when the lower limit value is detected. ing. In other words, the pressure gauge 7c includes the on-off valve 4 and the control valve 8.
is opened and the liquid pumped from the pumping device 1 is transferred to the pipe line 2.
The value of plus or minus D is set to be the above-mentioned upper limit value or lower limit value, centering on the pressure in the state where the liquid is flowing and being steadily discharged from the discharge nozzle 5. The value of D is the viscosity property of the liquid used or the required coating value (bead shape, discharge amount)
It is best to obtain it experimentally by
A value in the range of Kg/cm 2 to more than a dozen Kg/cm 2 is selected, for example 5 Kg/cm 2 . However, the width of the upper limit and the lower limit may not be the same, and the width of the lower limit changes depending on the position of the pressure gauge 7c.
上述のように構成された飛出し防止装置の動作
について説明すると、第２図Ａにおいて、破線は
吐出時の圧力状態を示し、これは比較のため先に
第２図Ｂにおいて述べた従来の吐出時の状態と同
一になつている。この状態において、開閉バルブ
４を閉じると、管路２内の圧力が上昇しはじめ、
圧力計７ｃが上限値を検知して出力信号を出す。
これによつて制御装置９は制御バルブ８を閉じる
ように作動し、それより下流側の圧力の上昇が防
止され、第２図Ａの実線で示す状態となる。同図
でわかるように、吐出ノズル付近の圧力は非吐出
時と吐出時とでほとんど差がないため、次に開閉
バルブ４を開いても吐出ノズル５からの液体の飛
出しは発生しない。開閉バルブ４を開くことによ
つて制御バルブ８より下流側の管路２の圧力が低
下するが、圧力計７ｃが下限値を検知して制御装
置９が作動し、制御バルブ８が開かれてすぐに圧
力が上昇し定常の吐出状態となる。 To explain the operation of the pop-out prevention device configured as described above, in FIG. 2A, the broken line indicates the pressure state at the time of discharge, and for comparison, this is the same as that of the conventional discharge prevention device described earlier in FIG. 2B. It has become the same as it was at the time. In this state, when the on-off valve 4 is closed, the pressure inside the pipe line 2 begins to rise,
The pressure gauge 7c detects the upper limit value and outputs an output signal.
As a result, the control device 9 operates to close the control valve 8, preventing the pressure downstream from increasing, resulting in the state shown by the solid line in FIG. 2A. As can be seen from the figure, there is almost no difference in the pressure near the discharge nozzle between non-discharge and discharge, so even if the opening/closing valve 4 is opened next, no liquid will splash out from the discharge nozzle 5. By opening the on-off valve 4, the pressure in the conduit 2 on the downstream side of the control valve 8 is reduced, but the pressure gauge 7c detects the lower limit value, the control device 9 is activated, and the control valve 8 is opened. The pressure immediately rises and a steady discharge state is reached.
上述の実施例によれば、非吐出時と吐出時との
圧力差がほとんどないため、吐出の開始時に液体
の飛出しを防止して正常な塗布を行うことができ
るとともに、開閉バルブ４に高圧が作用しないた
めその開閉動作が容易であつて、例えば塗布用の
ガンを用いて手操作を行う場合にガンのトリガー
の操作が軽く行い易く、また、ガンに接続された
ホースにも高圧が作用しないため、圧力変化によ
るホースの変形や反動がなく、これによる塗布位
置の変動もない。 According to the embodiment described above, since there is almost no pressure difference between the non-dispensing time and the dispensing time, it is possible to prevent the liquid from splashing out at the start of dispensing and perform normal application, and also to apply high pressure to the on-off valve 4. The opening/closing operation is easy because there is no pressure applied, and for example, when manually operating a coating gun, the trigger of the gun can be operated lightly and easily, and high pressure is also applied to the hose connected to the gun. Therefore, there is no deformation or reaction of the hose due to pressure changes, and there is no change in the application position due to this.
上述の実施例では、圧力計７ｃを開閉バルブ４
の上流側近傍に設けているが、これは開閉バルブ
４と制御バルブ８との間のいずれの位置に設けて
もよい。圧力計７ｃに代えて、歪ゲージまたは半
導体感圧素子を用いた圧力センサーと増幅器とを
用いてもよい。制御装置９はリレー、シーケンサ
ー又はマイクロコンピユータを用いることができ
る。 In the above embodiment, the pressure gauge 7c is the on-off valve 4.
Although it is provided near the upstream side of the valve, it may be provided at any position between the on-off valve 4 and the control valve 8. In place of the pressure gauge 7c, a strain gauge or a pressure sensor using a semiconductor pressure sensitive element and an amplifier may be used. The control device 9 can be a relay, a sequencer, or a microcomputer.
上述の実施例では制御バルブ８を減圧装置３の
下流側に設けたが、これを減圧装置３の上流側近
傍に設けてもよい。そのようにすると、制御バル
ブ８が閉じたときにおいて減圧装置３の一次側と
二次側との差圧が減少し、減圧装置３内の液体の
流路が非常に小さく絞られることによつてブレン
ドされた液体成分のみが流通して固化し減圧装置
３内が詰るという、いわゆるスクイージーの発生
が防止されるという効果を期待できる。 Although the control valve 8 is provided on the downstream side of the pressure reducing device 3 in the above-described embodiment, it may be provided near the upstream side of the pressure reducing device 3. By doing so, when the control valve 8 is closed, the differential pressure between the primary side and the secondary side of the pressure reducing device 3 decreases, and the liquid flow path in the pressure reducing device 3 is narrowed down to a very small amount. This can be expected to have the effect of preventing the so-called squeegee, in which only the blended liquid components flow and solidify, clogging the inside of the pressure reducing device 3.
（発明の効果）
以上のように本発明によると、非吐出時と吐出
時との開閉バルブに加わる圧力差を低下させるこ
とができるので、吐出の開始時の液体の飛出しを
防止することができる。また、開閉バルブに高圧
が作用しないのでその開閉動作が容易になり、例
えば塗布用のガンを用いる場合にはトリガーの操
作が軽く行い易く、またホースの変形や反動がな
くこれによる塗布位置の変動をなくすることが可
能となる。(Effects of the Invention) As described above, according to the present invention, it is possible to reduce the pressure difference applied to the opening/closing valve between non-dispensing and dispensing, thereby preventing liquid from splashing out at the start of dispensing. can. In addition, since no high pressure is applied to the opening/closing valve, it is easy to open and close the valve. For example, when using a coating gun, the trigger can be operated lightly and easily, and there is no deformation or reaction of the hose, resulting in changes in the coating position. It becomes possible to eliminate
第１図は本発明の実施例を示す図、第２図Ａは
第１図の実施例による圧力状態を示す図、第２図
Ｂは飛出し防止装置を用いない従来例の圧力状態
を示す図、第３図は飛出し防止装置を用いない液
体吐出装置を示す図である。
Ｑ……液体、１……圧送装置、２……管路、３
……減圧装置、４……開閉バルブ、５……吐出ノ
ズル、７ｃ……圧力計（圧力検知器）、８……制
御バルブ、９……制御装置。
Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2A is a diagram showing a pressure state according to the embodiment of Fig. 1, and Fig. 2B is a diagram showing a pressure state in a conventional example without using a pop-out prevention device. FIG. 3 is a diagram showing a liquid ejecting device that does not use a splash prevention device. Q...liquid, 1...pressure feeding device, 2...piping line, 3
...Pressure reducing device, 4...Opening/closing valve, 5...Discharge nozzle, 7c...Pressure gauge (pressure detector), 8...Control valve, 9...Control device.
Claims (1)
接続された管路と、該管路の途中に接続された減
圧装置と、前記管路の先端部に接続された開閉バ
ルブ及び吐出ノズルとを有した液体吐出装置にお
いて、前記開閉バルブの上流側に管路内の液体の
圧力を検知する圧力検知器を、該圧力検知器の上
流側に該管路を開閉する制御バルブを、それぞれ
設け、前記圧力検知器が通常吐出時の圧力よりも
一定値以上高い圧力又は一定値以上低い圧力を検
知すれば前記制御バルブを閉じ又は開くように制
御してなることを特徴とする液体の飛出し防止装
置。1. A pressure-feeding device that pumps liquid, a pipe line connected to this pressure-feeding device, a pressure reducing device connected in the middle of the pipe line, and an on-off valve and a discharge nozzle connected to the tip of the pipe line. In the liquid discharging device, a pressure sensor for detecting the pressure of the liquid in the pipe line is provided upstream of the opening/closing valve, and a control valve for opening and closing the pipe line is provided upstream of the pressure sensor, respectively. Liquid splash prevention characterized in that the control valve is controlled to close or open if the pressure detector detects a pressure higher than a certain value or a pressure lower than the normal discharge pressure by a certain value or more. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19898384A JPS6178456A (en) | 1984-09-21 | 1984-09-21 | Apparatus for preventing flying-out of liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19898384A JPS6178456A (en) | 1984-09-21 | 1984-09-21 | Apparatus for preventing flying-out of liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6178456A JPS6178456A (en) | 1986-04-22 |
| JPH0368740B2 true JPH0368740B2 (en) | 1991-10-29 |
Family
ID=16400161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19898384A Granted JPS6178456A (en) | 1984-09-21 | 1984-09-21 | Apparatus for preventing flying-out of liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6178456A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06218303A (en) * | 1993-01-27 | 1994-08-09 | Asahi Sanac Kk | Paint spraying machine for architectural facing |
| JP4877710B2 (en) * | 2005-08-01 | 2012-02-15 | 大日本スクリーン製造株式会社 | Liquid processing apparatus and liquid supply method |
-
1984
- 1984-09-21 JP JP19898384A patent/JPS6178456A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6178456A (en) | 1986-04-22 |
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