JPS63110B2 - - Google Patents
Info
- Publication number
- JPS63110B2 JPS63110B2 JP59087067A JP8706784A JPS63110B2 JP S63110 B2 JPS63110 B2 JP S63110B2 JP 59087067 A JP59087067 A JP 59087067A JP 8706784 A JP8706784 A JP 8706784A JP S63110 B2 JPS63110 B2 JP S63110B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- paint
- current
- signal
- spray gun
- 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
- 239000003973 paint Substances 0.000 claims description 32
- 239000007921 spray Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 18
- 230000007423 decrease Effects 0.000 claims description 16
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/082—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
Landscapes
- Nozzles (AREA)
Description
【発明の詳細な説明】
本発明は、高圧の液体塗料を小径のノズルから
高速度で噴射して被塗装物に塗装を施すエアレス
塗装機のノズル詰まりを検知する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting nozzle clogging in an airless coating machine that sprays high-pressure liquid paint from a small-diameter nozzle at high speed to coat an object.
エアレス塗装機のノズルは極めて小径であるた
め、使用する塗料によつては頻繁にノズル詰まり
を生ずることがあるが、被塗装物を自動的に塗装
する自動エアレス塗装機においては、被塗装物が
搬送コンベアによつて自動送りされるため、ノズ
ル詰まりの発見が遅れると、多量の塗装不良が生
ずることとなる。そこで、このような事態を回避
するため、出願人は実開昭57−145561号公報にお
いて開示されているように、ノズル詰まりが生ず
ると、塗料噴射時にノズルから発生する噴射音が
小さくなることに着目し、スプレイガンのノズル
の近傍にマイクロフオンを配置してノズルから発
生する噴射音の音量を検出し、その音量が予め定
められた設定値を下回つたときにノズル詰まりの
検知信号を発するようにしたノズル詰まり検知装
置を考案したのであるが、例えば、スプレイガン
に塗料を圧送するポンプの駆動源であるエアーモ
ータに供給される圧縮空気の圧力が低下する等の
原因によりスプレイガンに圧送される塗料の圧力
が一時的に低下すると、噴射圧力が低下してノズ
ルから発生する噴射音が小さくなるため、ノズル
詰まりが生じていないのにノズル詰まりの検知信
号が発せられて塗装ラインが停止することがあつ
た。 The nozzle of an airless paint sprayer has an extremely small diameter, so depending on the paint used, the nozzle may frequently become clogged. Since it is automatically fed by a conveyor, if the discovery of nozzle clogging is delayed, a large amount of coating defects will occur. Therefore, in order to avoid such a situation, the applicant proposed a method that reduces the jetting noise generated from the nozzle during paint jetting when the nozzle is clogged, as disclosed in Japanese Utility Model Application Publication No. 57-145561. A microphone is placed near the nozzle of a spray gun to detect the volume of the spray sound generated from the nozzle, and when the volume falls below a predetermined set value, a nozzle clogging detection signal is issued. We devised a nozzle clogging detection device to do this, but for example, if the pressure of the compressed air supplied to the air motor, which is the drive source for the pump that pumps paint to the spray gun, drops, etc. When the pressure of the paint being applied temporarily decreases, the jetting pressure decreases and the jetting noise generated from the nozzle decreases, causing a nozzle clogging detection signal to be issued and the painting line to stop even though the nozzle is not clogged. I had something to do.
本発明は叙上の点に鑑み成されたものであつ
て、塗料の噴射圧力の一時的な変化に左右される
ことなく、ノズル詰まりを適確に検知し得るよう
にしたエアレス塗装機のノズル詰まり検知装置を
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 points, and provides a nozzle for an airless paint sprayer that enables accurate detection of nozzle clogging without being affected by temporary changes in paint injection pressure. The object of the present invention is to provide a clogging detection device.
以下、本発明の一実施例を添付図面に基づいて
説明する。 Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.
１は自動スプレイガンであつて、内臓した図示
しない開閉弁の開弁により、エアーモータで駆動
されるプランジヤポンプやダイヤフラムポンプな
どの塗料圧送ポンプ２によつて供給ホース４を介
して圧送された高圧力の塗料をノズル６から高速
度で噴射し、空気との摩擦により微粒化して搬送
コンベア３により移送される被塗装物５に吹き付
けるようになつている。 Reference numeral 1 denotes an automatic spray gun, and when a built-in on-off valve (not shown) is opened, a paint pressure pump 2 such as a plunger pump or a diaphragm pump driven by an air motor pumps the liquid through a supply hose 4. Pressurized paint is injected from a nozzle 6 at high speed, atomized by friction with air, and sprayed onto the object to be painted 5 being transported by a conveyor 3.
スプレイガン１のノズル６の近傍にはノズル６
から発生する塗料噴射音を検知して電流に変換す
るマイクロフオン７が配置されており、このマイ
クロフオン７には、ノズル６から発生する塗料噴
射音のうち音圧レベルがピーク値を示す特定周波
数帯域の電流のみを通すことにより、工場内で発
生する雑音の影響を阻止する帯域フイルタ８が接
続され、この帯域フイルタ８には増幅器１０と、
その増幅電流が予め定められた設定値以下になる
とノズル詰まり検知信号を発する信号発生器１２
が順次に接続されており、この信号発生器１２
は、前記スプレイガン１の開閉弁が開いていると
きにのみ作動するようになつている。 There is a nozzle 6 near the nozzle 6 of the spray gun 1.
A microphone 7 is arranged to detect the paint jetting sound generated from the nozzle 6 and convert it into an electric current. A bandpass filter 8 is connected which blocks the influence of noise generated in the factory by passing only band current, and an amplifier 10 and an amplifier 10 are connected to the bandpass filter 8.
A signal generator 12 that issues a nozzle clogging detection signal when the amplified current becomes less than a predetermined set value.
are connected in sequence, and this signal generator 12
is designed to operate only when the on-off valve of the spray gun 1 is open.
上記は出願人が既に開示したところであるが、
本実施例においては、スプレイガン１に接続され
た前記供給ホース４のスプレイガン１側の端末
に、塗料の圧力を検出してその圧力に対応する信
号電流を送出する圧力センサ１５が接続されてい
るとともに、前記増幅器１０は、外部信号により
増幅度を調節し得るようになつており、前記圧力
センサ１５が増幅器１０の外部信号入力端子に接
続されていて、その信号電流のレベルが低下する
と、これに比例して増幅器１０の増幅度が高くな
るようになつている。 Although the above has already been disclosed by the applicant,
In this embodiment, a pressure sensor 15 is connected to the end of the supply hose 4 connected to the spray gun 1 on the spray gun 1 side, which detects the pressure of the paint and sends out a signal current corresponding to the pressure. At the same time, the amplifier 10 is adapted to be able to adjust the degree of amplification by an external signal, and when the pressure sensor 15 is connected to the external signal input terminal of the amplifier 10 and the level of the signal current decreases, The amplification degree of the amplifier 10 increases in proportion to this.
次に、本実施例の作用を説明すると、ノズル６
から塗料が正常に噴射されているときは、特定周
波数帯域の噴射音が定常な音量で発生するが、ノ
ズル６が完全に詰まつたり、半詰まりになつたり
すると噴射音が消失し、または、小さくなつて信
号発生器１２には予め定められた設定値以下の電
流が入力され、これにより信号発生器１２からノ
ズル詰まり検知信号が発せられて搬送コンベア３
が停止するとともにスプレイガン１の塗料の噴射
が停止し、さらに、警報が発せられて、ノズル詰
まりを作業者に知らせるようになつている。 Next, to explain the operation of this embodiment, the nozzle 6
When the paint is being sprayed normally, a jetting sound in a specific frequency band is generated at a steady volume, but if the nozzle 6 is completely clogged or partially clogged, the jetting sound disappears, or As the current decreases, a current below a predetermined set value is input to the signal generator 12. As a result, the signal generator 12 issues a nozzle clogging detection signal and the conveyor 3
When the spray gun 1 stops, the spray gun 1 stops spraying paint, and an alarm is issued to notify the operator of the nozzle clogging.
これに対し、塗料圧送ポンプ２の駆動源である
エアーモータに供給される圧縮空気の圧力が何ら
かの原因で低下することによりスプレイガン１に
圧送される塗料の圧力が低下した場合にも、ノズ
ル６から発生する噴射音が小さくなるのである
が、塗料の圧力が低下すると圧力センサ１５から
送出される信号電流のレベルが低下し、これによ
り増幅器１０の増幅度が高められ、増幅器１０か
ら出力される増幅電流が大となる。したがつて、
信号発生器１２には予め定められた設定値以上の
電流が入力されることとなるため、この場合には
ノズル詰まり検知信号は発せられず、真にノズル
詰まりが生じた場合にのみ検知信号が発せられ
る。 On the other hand, even if the pressure of the compressed air supplied to the air motor, which is the driving source of the paint pressure pump 2, decreases for some reason, and the pressure of the paint force-fed to the spray gun 1 decreases, the nozzle 6 However, when the pressure of the paint decreases, the level of the signal current sent from the pressure sensor 15 decreases, which increases the amplification degree of the amplifier 10, and the signal current is output from the amplifier 10. The amplification current becomes large. Therefore,
Since a current higher than a predetermined set value is input to the signal generator 12, a nozzle clogging detection signal is not generated in this case, and a detection signal is generated only when nozzle clogging has truly occurred. Emitted.
なお、本実施例においては、圧力センサ１５に
よつて増幅器１０の増幅度を制御するようにした
が、図に破線で示すように、圧力センサ１５を信
号発生器１２に接続するとともに、この信号発生
器１２の設定値を外部信号によつて調節し得るよ
うにし、圧力センサ１５の信号電流のレベルに比
例して信号発生器１２の設定値を変更することに
より、塗料圧力の低下に応じて設定値を低下させ
るようにしてもよく、このような構成によつても
塗料圧力が低下することに起因してノズルの噴射
音が小さくなつた場合にはノズル詰まりの検知信
号は発せられないようにすることができる。 In this embodiment, the amplification degree of the amplifier 10 is controlled by the pressure sensor 15, but as shown by the broken line in the figure, the pressure sensor 15 is connected to the signal generator 12, and this signal is By making the set point of the signal generator 12 adjustable by an external signal and changing the set point of the signal generator 12 in proportion to the level of the signal current of the pressure sensor 15, it is possible to adjust the set point of the signal generator 12 in response to a decrease in paint pressure. The set value may be lowered, and even with such a configuration, if the nozzle jet noise becomes low due to a decrease in paint pressure, a nozzle clogging detection signal will not be generated. It can be done.
上記実施例によつて具体的に説明したように、
本発明のエアレス塗装機のノズル詰まり検知装置
は、エアレス塗装機のスプレイガンのノズル近傍
に、塗料噴出時に前記ノズルから発生する音波を
電流に変換するマイクロフオンを配置し、該マイ
クロフオンに、特定周波数帯域の電流のみを通す
帯域フイルタと、該フイルタを通過した電流を増
幅する増幅器と、その増幅電流が予め定められた
設定値以下となつたときにノズル詰まりの検知信
号を発する信号発生器とを順次に接続して構成し
たノズル詰まり検知装置において、前記スプレイ
ガン直近の塗料経路に該経路内の塗料圧力の低下
を検出し、その低下分に相応する信号電流を送出
する圧力センサを設け、該信号電流により前記増
幅器の増幅度を上げ、若しくは、前記信号発生器
の設定値を下げる構成としたから、スプレイガン
に供給される塗料の圧送圧力が低下することに起
因してノズルから発生する噴射音が小さくなつた
ときにはノズル詰まり検知信号は発せられず、塗
料圧力が正常で、かつ、噴射音が小さくなつたと
きにのみノズル詰まり検知信号が発せられ、ノズ
ル詰まりを適確に検知することができる効果を奏
する。 As specifically explained in the above embodiment,
The nozzle clogging detection device for an airless paint sprayer according to the present invention has a microphone arranged near the nozzle of the spray gun of the airless paint sprayer, which converts the sound waves generated from the nozzle when paint is ejected into an electric current. A bandpass filter that passes only current in a frequency band, an amplifier that amplifies the current that has passed through the filter, and a signal generator that issues a nozzle clogging detection signal when the amplified current falls below a predetermined set value. In a nozzle clogging detection device configured by sequentially connecting the spray gun, a pressure sensor is provided in the paint path adjacent to the spray gun to detect a decrease in paint pressure in the path and send out a signal current corresponding to the decrease; Since the signal current is configured to increase the amplification degree of the amplifier or lower the set value of the signal generator, the paint generated from the nozzle is caused by a decrease in the pumping pressure of the paint supplied to the spray gun. The nozzle clogging detection signal is not emitted when the jetting sound becomes low, and the nozzle clogging detection signal is emitted only when the paint pressure is normal and the jetting sound becomes low, thereby accurately detecting nozzle clogging. It produces the effect that can be achieved.
添付図面は本発明の一実施例の概要を示すブロ
ツク図である。
１：スプレイガン、６：ノズル、７：マイクロ
フオン、８：帯域フイルタ、１０：増幅器、２：
信号発生器、１５：圧力センサ。
The accompanying drawings are block diagrams outlining one embodiment of the present invention. 1: Spray gun, 6: Nozzle, 7: Microphone, 8: Bandpass filter, 10: Amplifier, 2:
Signal generator, 15: Pressure sensor.
Claims (1)
に、塗料噴出時に前記ノズルから発生する音波を
電流に変換するマイクロフオンを配置し、該マイ
クロフオンに、特定周波数帯域の電流のみを通す
帯域フイルタと、該フイルタを通過した電流を増
幅する増幅器と、その増幅電流が予め定められた
設定値以下となつたときにノズル詰まりの検知信
号を発する信号発生器とを順次に接続して構成し
たノズル詰まり検知装置において、前記スプレイ
ガン直近の塗料経路に該経路内の塗料圧力の低下
を検出し、その低下分に相応する信号電流を送出
する圧力センサを設け、該信号電流により前記増
幅器の増幅度を上げ、若しくは、前記信号発生器
の設定値を下げる構成としたことを特徴とするエ
アレス塗装機のノズル詰まり検知装置。1. A microphone that converts the sound waves generated from the nozzle when paint is ejected into an electric current is placed near the nozzle of the spray gun of an airless paint sprayer, and a bandpass filter that passes only a current in a specific frequency band through the microphone; A nozzle clogging detection device configured by sequentially connecting an amplifier that amplifies the current passing through a filter and a signal generator that issues a nozzle clogging detection signal when the amplified current falls below a predetermined setting value. A pressure sensor is provided in the paint path adjacent to the spray gun to detect a decrease in paint pressure in the path and send out a signal current corresponding to the decrease, and the signal current increases the amplification degree of the amplifier; Alternatively, a nozzle clogging detection device for an airless paint sprayer, characterized in that the device is configured to lower a setting value of the signal generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59087067A JPS60227858A (en) | 1984-04-27 | 1984-04-27 | Device for detecting clogging in nozzle of airless painting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59087067A JPS60227858A (en) | 1984-04-27 | 1984-04-27 | Device for detecting clogging in nozzle of airless painting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60227858A JPS60227858A (en) | 1985-11-13 |
| JPS63110B2 true JPS63110B2 (en) | 1988-01-05 |
Family
ID=13904594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59087067A Granted JPS60227858A (en) | 1984-04-27 | 1984-04-27 | Device for detecting clogging in nozzle of airless painting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60227858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100311893B1 (en) * | 1991-03-20 | 2001-12-15 | 엔도 마코토 | Vapor phase growth method and vapor growth apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201600089389A1 (en) * | 2016-09-02 | 2018-03-02 | Sacmi | PLANT, AND ITS PROCESS, FOR THE DISPOSAL OF SANITARY HYGIENIC ARTICLES |
-
1984
- 1984-04-27 JP JP59087067A patent/JPS60227858A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100311893B1 (en) * | 1991-03-20 | 2001-12-15 | 엔도 마코토 | Vapor phase growth method and vapor growth apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60227858A (en) | 1985-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |