JP2009255079A - Injection amount control method for coating apparatus and apparatus - Google Patents

Injection amount control method for coating apparatus and apparatus Download PDF

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JP2009255079A
JP2009255079A JP2009080056A JP2009080056A JP2009255079A JP 2009255079 A JP2009255079 A JP 2009255079A JP 2009080056 A JP2009080056 A JP 2009080056A JP 2009080056 A JP2009080056 A JP 2009080056A JP 2009255079 A JP2009255079 A JP 2009255079A
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paint
pressure
tank
spray gun
recovery tank
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JP5195577B2 (en
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Makiko Saito
麻紀子 斉藤
Koichiro Hayashi
浩一郎 林
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IHI Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers

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Abstract

<P>PROBLEM TO BE SOLVED: To enable a coating of a fine flow amount to be accurately discharged, by stabilizing the flow rate of the coating discharged from a spray gun. <P>SOLUTION: An injection amount control method for a coating apparatus comprises the steps of supplying a coating a in a coating supply tank 1 to the spray gun 5 by supplying force-feeding air 3 adjusting pressure to the coating supply tank 1, injecting a part of the coating a with atomizing air 14 by discharging it from the spray gun 5 and recovering a coating a' which is not discharged from the spray gun 5 by a return pipe 7, wherein the return pipe 7 is connected to an airtight coating recovery tank 16 to adjust a pressure difference between pressure in the coating supply tank 1 and pressure in the coating recovery tank 16 by reducing pressure in the coating recovery tank 16, thereby adjusting the flow rate of the coating a to be supplied to the spray gun 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、スプレーガンによって噴射する塗料の噴射量を精度良く調節できるようにした塗装装置の噴射量制御方法及び装置に関する。   The present invention relates to an injection amount control method and apparatus for a coating apparatus that can accurately adjust the spray amount of paint sprayed by a spray gun.

例えば、シャフトに耐熱コーティング膜を形成するための塗装を行う場合には、アルミニウム等の金属粉が混入された塗料をシャフトに噴射して塗装膜を形成し、その後、焼付けを行って塗装膜をシャフトに一体化させている。この種の塗料には、目的に応じて種々の溶媒に金属粉を混合した水系、溶剤系のものがあり、例えば重量比で数十％の金属粉を含む高濃度のものもある。   For example, when painting to form a heat-resistant coating film on the shaft, a paint film mixed with metal powder such as aluminum is sprayed onto the shaft to form a paint film, and then baked to form the paint film. It is integrated with the shaft. This type of paint includes water-based and solvent-based ones in which metal powder is mixed in various solvents depending on the purpose.

上記したように金属粉が混入した塗料を用いてシャフトを塗装する際は、塗装後の焼付時に塗装膜がひび割れ等の問題を生じないように、薄く均一な厚さの塗装膜を形成することが厳しく要求されている。   When painting a shaft using a paint mixed with metal powder as described above, a thin and uniform coating film should be formed so that the coating film does not cause problems such as cracks during baking after painting. Is strictly demanded.

しかし、前記したような金属粉が混入した塗料は、粉体が分離して沈殿し易く、そのために詰まりを生じ易いという問題がある。更に、上記したような水系の塗料は塗布した際に液垂れを生じ易く、そのために少量ずつ噴射して薄い塗装膜を形成する必要がある。   However, the coating material in which the metal powder is mixed as described above has a problem that the powder is easily separated and precipitated, and therefore clogging is likely to occur. Furthermore, the water-based paint as described above is liable to cause dripping when applied, and therefore, it is necessary to spray a small amount little by little to form a thin coating film.

このため、前記シャフトを塗装する際には、１０μｍ以下程度の薄く均一な厚さになるように塗装を行って乾燥した後、この塗装・乾燥の作業を例えば６〜７回繰り返して重ね塗りすることにより５０〜６０μｍ前後の塗装膜を形成するようにしている。   For this reason, when coating the shaft, after coating and drying so as to have a thin and uniform thickness of about 10 μm or less, this coating and drying operation is repeated, for example, 6 to 7 times. As a result, a coating film of about 50 to 60 μm is formed.

上記したように、１０μｍ以下程度の薄い厚さの塗装膜を均一に形成するには、極めて微流量の塗料を安定して噴射できる塗装装置が必要である。   As described above, in order to uniformly form a coating film having a thin thickness of about 10 μm or less, a coating apparatus that can stably spray a very small flow rate of paint is required.

このような溶媒に粉体が混入された塗料を用いて塗装する塗装装置としては、塗料を循環供給することで粉体の沈殿を防ぐようにしたもの（特許文献１）、或いは、粉体と溶媒とを噴射直前に混合するようにしたもの（特許文献２）等がある。又、スプレーガンへ供給する塗料を循環させる際に、バイパス路を設けてバイパス流路の流量を絞ることで、スプレーガンへの塗料の流量を調整するようにしたもの（特許文献３）がある。   As a coating apparatus for coating using a paint in which powder is mixed in such a solvent, a powder is prevented from being precipitated by circulatingly supplying the paint (Patent Document 1), or There is a type in which a solvent is mixed immediately before jetting (Patent Document 2). In addition, when circulating the paint to be supplied to the spray gun, there is a system in which the flow rate of the paint to the spray gun is adjusted by providing a bypass path and reducing the flow rate of the bypass path (Patent Document 3). .

しかし、上記特許文献１〜３は、いずれも供給ポンプによって塗料を供給するようにしているために、塗料の供給が脈動することが避けられず、前記したように微流量の塗料をスプレーガンから吐出させることは困難である。   However, since all of the above Patent Documents 1 to 3 supply the paint by the supply pump, it is inevitable that the supply of the paint pulsates. It is difficult to discharge.

一方、図５は、本発明者等が実施した初期の塗装装置の一例を示すもので、塗料ａが装入された塗料供給タンク１には圧送用エア供給装置２からの圧送用エア３が電空レギュレータ等の供給側圧力設定器４を介して供給されており、塗料供給タンク１の塗料ａを圧送用エア３の圧力によって供給管６を介してスプレーガン５に供給するようにしている。スプレーガン５に供給された塗料ａは、スプレーガン５に備えたニードル弁等の開閉手段１５によって一部がスプレーガン５内に吐出され、吐出した塗料は霧化用エア供給装置１３によって供給される霧化用エア１４により霧化されてスプレーガン５の先端５ａから噴射されるようになっている。一方、スプレーガン５に吐出されなかった残りの塗料ａ'は、戻り管７により塗料回収タンク８に回収されるようになっている。上記塗料回収タンク８の上部は開口９により大気開放されている。   On the other hand, FIG. 5 shows an example of an initial coating apparatus implemented by the present inventors. In the paint supply tank 1 charged with the paint a, the pressure feed air 3 from the pressure feed air supply apparatus 2 is provided. It is supplied via a supply-side pressure setting device 4 such as an electropneumatic regulator, and the paint a in the paint supply tank 1 is supplied to the spray gun 5 through the supply pipe 6 by the pressure of the air 3 for pressure feeding. . Part of the paint a supplied to the spray gun 5 is discharged into the spray gun 5 by an opening / closing means 15 such as a needle valve provided in the spray gun 5, and the discharged paint is supplied by an atomizing air supply device 13. Atomized by the atomizing air 14 and sprayed from the tip 5 a of the spray gun 5. On the other hand, the remaining paint a ′ that has not been discharged to the spray gun 5 is collected in the paint collection tank 8 by the return pipe 7. The upper part of the paint recovery tank 8 is opened to the atmosphere through an opening 9.

又、塗料供給タンク１と塗料回収タンク８には、攪拌用エア供給装置１１からの攪拌用エア１２により或いは電気的に回転されて前記塗料ａ，ａ'を攪拌することにより塗料の粉体が沈殿するのを防止するようにした攪拌機１０を設けている。   In addition, the coating material supply tank 1 and the coating material recovery tank 8 receive the powder of the coating material by stirring the coating materials a and a ′ by the stirring air 12 from the stirring air supply device 11 or by being electrically rotated. A stirrer 10 is provided so as to prevent precipitation.

上記した如く、塗料供給タンクに圧送用エアを供給してエア圧力によって塗料をスプレーガンに供給するようにしたものとしては特許文献４がある。又、循環流路をスプレーガンの内部まで通すようにした循環式スプレーガンとしては特許文献５がある。   As described above, Japanese Patent Application Laid-Open No. H10-228688 discloses a technique in which air for pressure feeding is supplied to a paint supply tank and paint is supplied to a spray gun by air pressure. Further, there is Patent Document 5 as a circulation type spray gun in which the circulation channel is passed to the inside of the spray gun.

上記図５及び特許文献４、５の装置によれば、前記特許文献１〜３と比較するとスプレーガンから噴射される塗料の噴射量を安定させることができる。   According to the apparatus of FIG. 5 and Patent Documents 4 and 5, the amount of paint sprayed from the spray gun can be stabilized as compared with Patent Documents 1 to 3.

特開２００４−３３０１１９号公報JP 2004-330119 A 特開２００３−０３３６８１号公報JP 2003-033681 A 特開平０６−０４７３３０号公報Japanese Patent Laid-Open No. 06-047330 特開２０００−３２５８３７号公報JP 2000-325837 A 特開２００６−０５５７３６号公報JP 2006-055736 A

図５及び特許文献４、５に示した装置において、圧送用エア３のエア圧力により塗料供給タンク１の塗料ａをスプレーガン５に供給して噴射させる際には、図６に示すように、塗料供給タンク１の供給圧Ｐ１（塗料の循環速度と相関関係にある）の塗料ａは供給管６及び戻り管７を通る間に圧力が低下し、塗料回収タンク８に回収されると大気圧Ｐ０となる。そして、前記塗料供給タンク１の供給圧Ｐ１と大気圧Ｐ０との間における比較的高い吐出圧Ｐ２において塗料はスプレーガン５から吐出される。この吐出圧Ｐ２はスプレーガン５から吐出される塗料の吐出速度（流量）と相関関係にある。ここで、スプレーガン５による塗料の噴射量を制御するには、スプレーガン５内に対する塗料の吐出圧を精度良く制御する必要がある。   In the apparatus shown in FIG. 5 and Patent Documents 4 and 5, when the paint a in the paint supply tank 1 is supplied to the spray gun 5 by the air pressure of the pressure feeding air 3 and sprayed, as shown in FIG. The pressure of the paint a at the supply pressure P1 (correlated with the paint circulation speed) of the paint supply tank 1 decreases while passing through the supply pipe 6 and the return pipe 7, and when it is recovered in the paint recovery tank 8, it is atmospheric pressure. P0. The paint is discharged from the spray gun 5 at a relatively high discharge pressure P2 between the supply pressure P1 of the paint supply tank 1 and the atmospheric pressure P0. This discharge pressure P2 has a correlation with the discharge speed (flow rate) of the paint discharged from the spray gun 5. Here, in order to control the spray amount of the paint by the spray gun 5, it is necessary to accurately control the discharge pressure of the paint to the inside of the spray gun 5.

従って、スプレーガン５から微流量の塗料を吐出するためには、破線Ａで示すように前記塗料供給タンク１の供給圧Ｐ１を低く設定して、スプレーガン５の吐出圧Ｐ２を低く調節することになるが、このように供給圧Ｐ１を低く調節すると、スプレーガン５における塗料の吐出部の流速が小さくなることによってスプレーガン５における塗料の吐出が不安定になる問題がある。即ち、流速が小さくなると粉体が分離し易くなると共に、供給圧Ｐ１が低いことにより供給管６の流路抵抗等による圧力の変動が起こることにより塗料の吐出は不安定となり、特に微流量を吐出する際にはこの現象が更に顕著になるという問題があった。   Therefore, in order to discharge a small amount of paint from the spray gun 5, the supply pressure P1 of the paint supply tank 1 is set low as shown by the broken line A, and the discharge pressure P2 of the spray gun 5 is adjusted low. However, if the supply pressure P1 is adjusted to be low in this way, there is a problem that the discharge of the paint in the spray gun 5 becomes unstable due to the decrease in the flow velocity of the discharge part of the paint in the spray gun 5. That is, when the flow rate is reduced, the powder is easily separated, and since the supply pressure P1 is low, pressure fluctuations due to the flow path resistance of the supply pipe 6 occur, resulting in unstable discharge of the paint. There is a problem that this phenomenon becomes more remarkable when discharging.

このように、スプレーガン５に微流量の塗料を吐出する際に安定した吐出ができないことにより、スプレーガン５から微流量の塗料を噴射して薄い均一な塗装膜を精度良く形成することは困難であった。   As described above, it is difficult to form a thin uniform coating film with high accuracy by spraying a small flow rate of paint from the spray gun 5 because stable discharge cannot be performed when a small flow rate of paint is discharged to the spray gun 5. Met.

本発明は、上記実情に鑑みてなしたもので、スプレーガンに吐出する塗料の流速を安定させて微流量の塗料を精度良く吐出させられるようにした塗装装置の噴射量制御方法及び装置を提供しようとするものである。   The present invention has been made in view of the above circumstances, and provides an injection amount control method and apparatus for a coating apparatus capable of stabilizing a flow rate of a paint discharged to a spray gun and accurately discharging a small flow of paint. It is something to try.

本発明は、塗料供給タンクに圧力を調整した圧送用エアを供給することにより塗料供給タンク内の塗料をスプレーガンに供給し、塗料の一部をスプレーガンから吐出することにより霧化用エアにより噴射させ、スプレーガンから吐出されない塗料は戻り管により回収するようにしている塗装装置の噴射量制御方法であって、
前記戻り管を塗料回収タンクに接続し、
該塗料回収タンクの圧力を設定して前記塗料供給タンク内の圧力と塗料回収タンク内の圧力との圧力差を調節することによりスプレーガンに供給する塗料の流速を調節する
ことを特徴とする塗装装置の噴射量制御方法、に係るものである。 The present invention supplies the paint supply tank with the pressure-feeding air adjusted in pressure to supply the paint in the paint supply tank to the spray gun, and discharges a part of the paint from the spray gun. A spray amount control method for a coating apparatus in which paint that is sprayed and is not discharged from a spray gun is collected by a return pipe,
Connecting the return pipe to the paint recovery tank;
The paint is characterized in that the flow rate of the paint supplied to the spray gun is adjusted by setting the pressure of the paint recovery tank and adjusting the pressure difference between the pressure in the paint supply tank and the pressure in the paint recovery tank. The present invention relates to an injection amount control method for an apparatus.

上記塗装装置の噴射量制御方法において、前記塗料回収タンクを減圧するようにしたことは好ましい。   In the spray amount control method of the coating apparatus, it is preferable that the paint recovery tank is depressurized.

又、上記塗装装置の噴射量制御方法において、前記スプレーガンの塗料の吐出圧と大気圧との圧力差が吐出差圧設定値になるように前記圧力差を調節することは好ましい。   In the spray amount control method of the coating apparatus, it is preferable to adjust the pressure difference so that the pressure difference between the spray pressure of the paint of the spray gun and the atmospheric pressure becomes a discharge differential pressure setting value.

又、上記塗装装置の噴射量制御方法において、前記スプレーガンに吐出される塗料の吐出量を計測し、計測した塗料の吐出量に基づいて前記圧送用エアの圧力を調整することは好ましい。   Further, in the spray amount control method of the coating apparatus, it is preferable to measure the discharge amount of the paint discharged to the spray gun and adjust the pressure of the pressure feeding air based on the measured discharge amount of the paint.

又、上記塗装装置の噴射量制御方法において、前記塗料回収タンクの塗料を塗料供給タンクに戻して循環使用することは好ましい。   In the spray amount control method of the coating apparatus, it is preferable that the paint in the paint recovery tank is returned to the paint supply tank and circulated for use.

又、上記塗装装置の噴射量制御方法において、前記スプレーガンと、塗料供給タンクと、塗料回収タンクを防爆ブース内に備えるようにしてもよい。   In the spray amount control method of the coating apparatus, the spray gun, the paint supply tank, and the paint collection tank may be provided in an explosion-proof booth.

本発明は、塗料を収容する塗料供給タンクと、該塗料供給タンクに供給する圧送用エアの圧力を設定する供給側圧力設定器と、圧送用エアにより塗料供給タンクから供給される塗料の一部を吐出させ吐出しない塗料は戻り管に流動させるスプレーガンとを有する塗装装置の噴射量制御装置であって、
前記戻り管に接続された気密の塗料回収タンクと、
該塗料回収タンクに備えた回収側圧力設定手段と、
タンク間差圧設定値に基づき塗料供給タンクと塗料回収タンクの圧力差を制御する制御器と、
を有することを特徴とする塗装装置の噴射量制御装置、に係るものである。 The present invention relates to a paint supply tank that contains paint, a supply-side pressure setting device that sets the pressure of the pressure-feeding air supplied to the paint-supply tank, and a part of the paint that is supplied from the paint-supply tank by the pressure-feeding air The spray amount control device of the coating apparatus having a spray gun that discharges and discharges the paint to the return pipe,
An airtight paint recovery tank connected to the return pipe;
Recovery side pressure setting means provided in the paint recovery tank;
A controller for controlling the pressure difference between the paint supply tank and the paint recovery tank based on the inter-tank differential pressure setting value;
The present invention relates to an injection amount control device for a coating apparatus, characterized by comprising:

上記塗装装置の噴射量制御装置において、前記回収側圧力設定手段が、塗料回収タンクの圧力を負圧に調節するための減圧装置であることは好ましい。   In the spray amount control device of the coating apparatus, it is preferable that the recovery side pressure setting means is a pressure reducing device for adjusting the pressure of the paint recovery tank to a negative pressure.

又、上記塗装装置の噴射量制御装置において、前記制御器が、スプレーガン内の吐出圧と大気圧との圧力差を吐出差圧設定値に調節するようにしたことは好ましい。   In the spray amount control device of the coating apparatus, it is preferable that the controller adjusts the pressure difference between the discharge pressure in the spray gun and the atmospheric pressure to a discharge differential pressure set value.

又、上記塗装装置の噴射量制御装置において、前記スプレーガンから塗料を吐出させた時の吐出量を検出する吐出量検出装置を備え、該吐出量検出装置の吐出量検出値を前記制御器に入力して該吐出量検出値に基づき前記圧送用エアの圧力を調節するようにしたことは好ましい。   The spray amount control device of the coating apparatus further includes a discharge amount detection device that detects a discharge amount when the paint is discharged from the spray gun, and the discharge amount detection value of the discharge amount detection device is stored in the controller. It is preferable that the pressure of the pressure-feeding air is adjusted based on the detected discharge amount.

又、上記塗装装置の噴射量制御装置において、前記塗料回収タンクの塗料を塗料供給タンクに戻す循環流路によって塗料回収タンクと塗料供給タンクの間を接続したことは好ましい。   In the spray amount control device of the coating apparatus, it is preferable that the paint recovery tank and the paint supply tank are connected by a circulation passage for returning the paint in the paint recovery tank to the paint supply tank.

又、上記塗装装置の噴射量制御装置において、前記塗料回収タンクに前記圧送用エアを供給して塗料回収タンクの塗料を塗料供給タンクに戻すようにしたことは好ましい。   In the spray amount control apparatus of the coating apparatus, it is preferable that the pressure-feeding air is supplied to the paint recovery tank so that the paint in the paint recovery tank is returned to the paint supply tank.

又、上記塗装装置の噴射量制御装置において、前記塗料回収タンクを昇降可能に構成し、該塗料回収タンクを上昇させることにより塗料回収タンク内の塗料を重力によって塗料供給タンクに戻すようにしたことは好ましい。   Further, in the spray amount control device of the coating apparatus, the paint recovery tank is configured to be movable up and down, and the paint in the paint recovery tank is returned to the paint supply tank by gravity by raising the paint recovery tank. Is preferred.

又、上記塗装装置の噴射量制御装置において、前記スプレーガンと、塗料供給タンクと、塗料回収タンクは防爆ブース内に備えるようにしてもよい。   In the spray amount control device of the coating apparatus, the spray gun, the paint supply tank, and the paint collection tank may be provided in an explosion-proof booth.

本発明の塗装装置の噴射量制御方法及び装置によれば、戻り管を気密の塗料回収タンクに接続し、塗料回収タンク内を減圧して塗料供給タンク圧力と塗料回収タンク圧力との圧力差を調節することによりスプレーガンに供給する塗料の流速を調節するようにしたので、スプレーガン内における塗料の流速を安定させることができ、これにより、粉体が沈殿する問題を防止すると共に、スプレーガンに吐出する塗料の吐出を安定させることができるという優れた効果を奏し得る。   According to the injection amount control method and apparatus for a coating apparatus of the present invention, the return pipe is connected to an airtight paint recovery tank, and the pressure inside the paint recovery tank is reduced to reduce the pressure difference between the paint supply tank pressure and the paint recovery tank pressure. By adjusting the flow rate of the paint supplied to the spray gun, the flow rate of the paint in the spray gun can be stabilized, thereby preventing the problem of powder precipitation and the spray gun. It is possible to achieve an excellent effect that the discharge of the paint discharged on the surface can be stabilized.

更に、大気圧とスプレーガンの吐出圧力との圧力差を調節するようにしたので、塗料の吐出量に関連する吐出速度を任意に設定することができ、よって、スプレーガンに微流量の塗料を安定して精度良く吐出し、微流量の塗料の噴射により薄い均一な塗装膜を精度良く形成できるという優れた効果を奏し得る。   Furthermore, since the pressure difference between the atmospheric pressure and the spray pressure of the spray gun is adjusted, it is possible to arbitrarily set the discharge speed related to the amount of paint discharged. It is possible to achieve an excellent effect that a thin and uniform coating film can be accurately formed by ejecting a paint with a small flow rate stably and accurately.

本発明における塗装装置の一実施例を示すブロック図である。It is a block diagram which shows one Example of the coating device in this invention. 図１の塗装装置における塗料供給タンクの供給圧と、塗料回収タンク圧と、吐出圧の関係を示す線図である。It is a diagram which shows the relationship between the supply pressure of the coating material supply tank in the coating apparatus of FIG. 1, a coating material collection | recovery tank pressure, and discharge pressure. 本発明の塗装装置を更に具体化した一例を示すブロック図である。It is a block diagram which shows an example which actualized the coating apparatus of this invention further. 本発明の塗装装置を更に具体化した他の例を示すブロック図である。It is a block diagram which shows the other example which actualized the coating apparatus of this invention further. 本発明者等が実施した初期の塗装装置の一例を示すブロック図である。It is a block diagram which shows an example of the initial stage coating apparatus which the present inventors implemented. 図５の塗装装置における塗料供給タンクの供給圧と、塗料回収タンク圧と、吐出圧の関係を示す線図である。FIG. 6 is a diagram showing a relationship between a supply pressure of a paint supply tank, a paint recovery tank pressure, and a discharge pressure in the coating apparatus of FIG. 5.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は図５に示した装置に適用した本発明の塗装装置の一実施例を示すもので、図５と同様に、圧送用エア供給装置２からの圧送用エア３が供給側圧力設定器４を介して塗料供給タンク１に供給されており、塗料供給タンク１の塗料ａは圧送用エア３の圧力によって供給管６を介してスプレーガン５に供給されている。スプレーガン５に供給された塗料ａはスプレーガン５内に備えられたニードル弁等の開閉手段１５によって一部がスプレーガン５内に吐出されて霧化用エア１４により先端５ａから噴射され、スプレーガン５内に吐出されなかった残りの塗料ａ'は戻り管７により回収されている。   FIG. 1 shows an embodiment of a coating apparatus according to the present invention applied to the apparatus shown in FIG. 5. As in FIG. 5, the pressure-feeding air 3 from the pressure-feeding air supply device 2 is supplied to the supply-side pressure setting device. The paint a in the paint supply tank 1 is supplied to the spray gun 5 through the supply pipe 6 by the pressure of the air 3 for pressure feeding. Part of the coating material a supplied to the spray gun 5 is discharged into the spray gun 5 by an opening / closing means 15 such as a needle valve provided in the spray gun 5 and sprayed from the tip 5a by the atomizing air 14 to be sprayed. The remaining paint a ′ that has not been discharged into the gun 5 is collected by the return pipe 7.

上記構成において、図１に示す実施例では、気密構造の塗料回収タンク１６を設け、該塗料回収タンク１６を戻り管７に気密に接続している。   In the above configuration, in the embodiment shown in FIG. 1, a paint recovery tank 16 having an airtight structure is provided, and the paint recovery tank 16 is connected to the return pipe 7 in an airtight manner.

更に、前記塗料回収タンク１６内の上部には、電空レギュレータ等による回収側圧力設定器１７を介し塗料回収タンク１６内を吸引して所定の設定圧に調節するようにした減圧装置１８'（真空装置）を接続して、回収側圧力設定手段１８を構成した場合を示している。尚、回収側圧力設定手段１８は、上記減圧装置１８'を備えて圧力を設定する他に、塗料回収タンク１６を大気に開放することによって塗料回収タンク１６内を大気圧に設定する方式、或いは加圧装置によって塗料回収タンク１６内を所定の正圧に加圧して設定圧に設定する方式等を用いてもよい。   Further, a decompression device 18 ′ (at the upper part of the paint recovery tank 16 is sucked into the paint recovery tank 16 through a recovery-side pressure setting device 17 such as an electropneumatic regulator and adjusted to a predetermined set pressure. The case where the collection | recovery side pressure setting means 18 is comprised by connecting a vacuum apparatus is shown. The recovery-side pressure setting means 18 includes a pressure reducing device 18 ′ and sets the pressure, or a method of setting the inside of the paint recovery tank 16 to atmospheric pressure by opening the paint recovery tank 16 to the atmosphere, or A system in which the inside of the paint recovery tank 16 is pressurized to a predetermined positive pressure by a pressurizing device and set to a set pressure may be used.

更に、前記供給側圧力設定器４に制御信号１９を送って塗料供給タンク１内を正圧に制御すると共に、回収側圧力設定器１７に制御信号２０を送って塗料回収タンク１６内を負圧（設定圧）に制御する制御器２１を設けている。   Further, a control signal 19 is sent to the supply side pressure setter 4 to control the inside of the paint supply tank 1 to a positive pressure, and a control signal 20 is sent to the recovery side pressure setter 17 to give a negative pressure inside the paint collection tank 16. A controller 21 is provided for controlling to (set pressure).

前記制御器２１には、スプレーガン５内の塗料圧を検出する圧力計２２からの圧力信号２２ａが入力されている。この時、スプレーガン５に上記圧力計２２が設置できない場合には、供給管６におけるスプレーガン５に近い位置に設けた圧力計２２'によってスプレーガン５に供給する塗料の圧力を検出し、その圧力信号２２ａを制御器２１に入力してもよい。   A pressure signal 22 a from a pressure gauge 22 that detects the paint pressure in the spray gun 5 is input to the controller 21. At this time, when the pressure gauge 22 cannot be installed in the spray gun 5, the pressure of the paint supplied to the spray gun 5 is detected by a pressure gauge 22 ′ provided near the spray gun 5 in the supply pipe 6. The pressure signal 22a may be input to the controller 21.

又、前記制御器２１には、塗料供給タンク１に設けた圧力計２３からの圧力信号２３ａと、塗料回収タンク１６に設けた圧力計２４からの圧力信号２４ａとが入力されている。 更に、前記制御器２１には、前記圧力信号２２ａに基づいてスプレーガン５内に吐出される塗料の吐出圧と大気圧との圧力差である吐出差圧設定値２５が入力されていると共に、塗料供給タンク１と塗料回収タンク１６との間の圧力差を設定するためのタンク間差圧設定値２６が入力されている。   Further, a pressure signal 23 a from a pressure gauge 23 provided in the paint supply tank 1 and a pressure signal 24 a from a pressure gauge 24 provided in the paint recovery tank 16 are input to the controller 21. Further, the controller 21 is supplied with a discharge differential pressure setting value 25 which is a pressure difference between the discharge pressure of the paint discharged into the spray gun 5 and the atmospheric pressure based on the pressure signal 22a. An inter-tank differential pressure setting value 26 for setting a pressure difference between the paint supply tank 1 and the paint recovery tank 16 is input.

以下に上記図１の実施例の作動を説明する。   The operation of the embodiment of FIG. 1 will be described below.

圧送用エア供給装置２からの圧送用エア３は供給側圧力設定器４により調節されて塗料供給タンク１に供給され、塗料供給タンク１内が加圧される。すると、塗料供給タンク１の塗料ａは圧送用エア３のエア圧力によって供給管６を介してスプレーガン５に供給され、スプレーガン５に供給された塗料ａの一部は開閉手段１５の調節によりスプレーガン５内から吐出され、スプレーガン５で吐出されなかった残りの塗料ａ'は戻り管７により塗料回収タンク１６に回収される。   The pressure-feeding air 3 from the pressure-feeding air supply device 2 is adjusted by the supply-side pressure setting device 4 and supplied to the paint supply tank 1, and the inside of the paint supply tank 1 is pressurized. Then, the paint a in the paint supply tank 1 is supplied to the spray gun 5 through the supply pipe 6 by the air pressure of the pumping air 3, and a part of the paint a supplied to the spray gun 5 is adjusted by the opening / closing means 15. The remaining paint a ′ discharged from the spray gun 5 and not discharged by the spray gun 5 is collected in the paint collection tank 16 by the return pipe 7.

この時、霧化用エア供給装置１３から霧化用エア１４をスプレーガン５に供給すると、前記スプレーガン５に吐出された塗料は霧化用エア１４により霧化されて先端５ａから噴射されて塗装が行われる。この時、塗料供給タンク１及び塗料回収タンク１６に備えた攪拌機１０を攪拌用エア１２により駆動して各タンク１，１６内の塗料ａ，ａ'を攪拌しておくことにより、塗料ａ，ａ'の粉体が沈殿して分離する問題を生じることはない。   At this time, when the atomizing air 14 is supplied from the atomizing air supply device 13 to the spray gun 5, the paint discharged to the spray gun 5 is atomized by the atomizing air 14 and sprayed from the tip 5 a. Painting is done. At this time, the stirrer 10 provided in the paint supply tank 1 and the paint recovery tank 16 is driven by the stirring air 12 to stir the paints a and a ′ in the tanks 1 and 16, whereby the paints a and a The 'powder does not settle out and cause problems.

上記したように圧送用エア３のエア圧力によって塗料ａをスプレーガン５に供給している状態において、圧力計２２からの圧力信号２２ａを入力している制御器２１は、スプレーガン５内での塗料の吐出圧と大気圧との圧力差が所定の吐出差圧設定値２５になるように、供給側圧力設定器４に制御信号１９を送って、塗料供給タンク１の圧力を調整する。   As described above, in the state where the paint a is supplied to the spray gun 5 by the air pressure of the pressure feeding air 3, the controller 21 receiving the pressure signal 22 a from the pressure gauge 22 is used in the spray gun 5. The control signal 19 is sent to the supply side pressure setting device 4 so that the pressure difference between the paint discharge pressure and the atmospheric pressure becomes a predetermined discharge differential pressure setting value 25, and the pressure in the paint supply tank 1 is adjusted.

更に、制御器２１は、圧力計２３，２４からの圧力信号２３ａ，２４ａに基づいて、塗料供給タンク１と塗料回収タンク１６との圧力差が所定のタンク間差圧設定値２６になるように回収側圧力設定器１７に制御信号２０を送って塗料回収タンク１６の圧力（負圧）を調節する。   Further, the controller 21 makes the pressure difference between the paint supply tank 1 and the paint recovery tank 16 become a predetermined inter-tank differential pressure setting value 26 based on the pressure signals 23a, 24a from the pressure gauges 23, 24. A control signal 20 is sent to the recovery side pressure setting device 17 to adjust the pressure (negative pressure) of the paint recovery tank 16.

塗料回収タンク１６内を負圧に調整すると、戻り管７内は吸引されるようになるため、塗料供給タンク１から圧送用エア３により加圧されてスプレーガン５に供給される塗料ａの流速と、戻り管７が吸引されることによるスプレーガン５からの塗料の流速が制御されるようになり、スプレーガン５内部の塗料の流速を高めることができる。このように、塗料回収タンク１６内の負圧によってスプレーガン５内部の塗料の流速を高める調節を行う際には、制御器２１は、前記吐出差圧設定値２５が維持されるように、前記回収側圧力設定手段１８に制御信号１９を送って塗料回収タンク１６の圧力を設定圧になるように調整すると共に、供給側圧力設定器４に制御信号１９を送って塗料供給タンク１の圧力の調整を行う。   When the inside of the paint recovery tank 16 is adjusted to a negative pressure, the return pipe 7 is sucked, so the flow rate of the paint a that is pressurized from the paint supply tank 1 by the pressure feeding air 3 and supplied to the spray gun 5. Then, the flow rate of the paint from the spray gun 5 due to the suction of the return pipe 7 is controlled, and the flow rate of the paint inside the spray gun 5 can be increased. In this way, when performing adjustment to increase the flow rate of the paint in the spray gun 5 by the negative pressure in the paint collection tank 16, the controller 21 is configured to maintain the discharge differential pressure setting value 25 so that the discharge differential pressure set value 25 is maintained. A control signal 19 is sent to the collection side pressure setting means 18 to adjust the pressure of the paint collection tank 16 so as to become a set pressure, and a control signal 19 is sent to the supply side pressure setter 4 to adjust the pressure of the paint supply tank 1. Make adjustments.

図２に示すように、塗料回収タンク１６の圧力が大気圧Ｐ０以下の負圧Ｐ３となるため、塗料供給タンク１の供給圧Ｐ１（塗料の循環速度と相関関係にある）と前記塗料回収タンク１６の負圧Ｐ３との間における大気圧Ｐ０との差である吐出圧Ｐ２'は、小さく設定できるようになる。   As shown in FIG. 2, since the pressure of the paint recovery tank 16 becomes a negative pressure P3 that is equal to or lower than the atmospheric pressure P0, the supply pressure P1 of the paint supply tank 1 (which is correlated with the paint circulation speed) and the paint recovery tank The discharge pressure P2 ′, which is the difference from the atmospheric pressure P0 between the negative pressure P3 of 16 and the negative pressure P3, can be set small.

従って、スプレーガン５からの吐出圧Ｐ２'を小さく保持しつつ、供給管６内の塗料ａの流速を高い速度に保持することができので、供給管６内での塗料ａの流動が安定し、よって、スプレーガン５から微流量の塗料を安定して吐出できるようになる。更に、供給管６内の塗料ａの流速が高く保持されることにより、供給管６内での塗料ａの沈殿が防止される。   Accordingly, the flow rate of the paint a in the supply pipe 6 can be stabilized because the flow rate of the paint a in the supply pipe 6 can be maintained at a high speed while keeping the discharge pressure P2 ′ from the spray gun 5 small. Therefore, it becomes possible to stably discharge a small flow rate of paint from the spray gun 5. Furthermore, since the flow rate of the paint a in the supply pipe 6 is kept high, precipitation of the paint a in the supply pipe 6 is prevented.

更に、戻り管７を吸引することによりスプレーガン５内部での塗料の流速が安定するようになるので、従来における塗料ａの圧力変動といった問題が低減されて、スプレーガン５に微流量の塗料を更に安定して吐出できるようになる。   Furthermore, since the flow velocity of the paint inside the spray gun 5 is stabilized by sucking the return pipe 7, the problem of pressure fluctuation of the paint a in the past is reduced, and a small flow rate of paint is applied to the spray gun 5. Furthermore, it becomes possible to discharge stably.

上記したように、スプレーガン５に微流量の塗料を安定して精度良く吐出できるようになるので、スプレーガン５から微流量の塗料を噴射させて薄い塗装膜を重ね塗りするような場合の塗装品質を大幅に向上することができる。   As described above, since a small flow rate of paint can be stably and accurately discharged to the spray gun 5, the coating in the case where a thin paint film is repeatedly applied by spraying a small flow rate of paint from the spray gun 5. Quality can be greatly improved.

図３は、本発明の塗装装置を更に具体化した一例を示すものであり、図３では、前記スプレーガン５と、塗料供給タンク１と、塗料回収タンク１６を防爆ブース２７内に備えた場合を示している。又、前記塗料回収タンク１６を吸引する減圧装置１８'及び回収側圧力設定器１７からなる回収側圧力設定手段１８は防爆ブース２７の外部に設けている。   FIG. 3 shows an example in which the painting apparatus of the present invention is further embodied. In FIG. 3, the spray gun 5, the paint supply tank 1, and the paint collection tank 16 are provided in an explosion-proof booth 27. Is shown. A recovery side pressure setting means 18 including a pressure reducing device 18 ′ for sucking the paint recovery tank 16 and a recovery side pressure setting device 17 is provided outside the explosion-proof booth 27.

又、図３では、前記塗料供給タンク１と塗料回収タンク１６との間は開閉弁２８を有する循環流路２９によって接続してあり、塗料供給タンク１と塗料回収タンク１６には夫々レベル計５０，５１を設けている。更に、前記塗料供給タンク１には開閉弁３０を有する洗浄水流路３１によって洗浄水３２が供給されるようになっており、更に、前記戻り管７には３方弁３３を介して洗浄排水管３４が接続されている。７'は３方弁３３とスプレーガン５との間の戻り管、３５は排水タンクである。   In FIG. 3, the paint supply tank 1 and the paint collection tank 16 are connected by a circulation passage 29 having an on-off valve 28. The paint supply tank 1 and the paint collection tank 16 are respectively connected to a level meter 50. , 51 are provided. Further, cleaning water 32 is supplied to the paint supply tank 1 by a cleaning water flow path 31 having an on-off valve 30, and further, a cleaning drain pipe is connected to the return pipe 7 via a three-way valve 33. 34 is connected. 7 'is a return pipe between the three-way valve 33 and the spray gun 5, and 35 is a drainage tank.

又、前記スプレーガン５の塗料を噴射する先端５ａの下部には、霧化用エア供給装置１３からの霧化用エア１４の供給が停止された状態で、スプレーガン５から塗料を吐出させた時に落下する塗料の液滴Ｘの滴下を検出するようにした投光器３６と受光器３７からなる光センサ３８が設けてあり、この光センサ３８によって検出した液滴Ｘの滴下信号３８ａは前記制御器２１に入力されており、制御器２１は液滴Ｘの滴下間隔に基づいてスプレーガン５から吐出される塗料の吐出量を計測するようになっている。   In addition, the paint was discharged from the spray gun 5 to the lower part of the tip 5a for spraying the paint of the spray gun 5 in a state where the supply of the atomizing air 14 from the atomizing air supply device 13 was stopped. An optical sensor 38 comprising a light projector 36 and a light receiver 37 for detecting the dropping of the paint droplet X that sometimes drops is provided, and the dropping signal 38a of the liquid droplet X detected by this optical sensor 38 is the controller. 21, the controller 21 measures the discharge amount of the paint discharged from the spray gun 5 based on the drop interval of the droplet X.

又、防爆ブース２７の外部に設けたエアパネル３９には、工場エア４０を取入れてドライヤ、エアフィルタ、ミストセパレータ等の浄化器４１等を経た後、圧送用エア３として供給する前記圧送用エア供給装置２が構成されている。圧送用エア供給装置２の圧送用エア３は、前記供給側圧力設定器４を経た後、開閉弁４２、流量計４３を介してソレノイドバルブからなる切換弁４４に導かれ、圧送用エア３は切換弁４４によって前記塗料供給タンク１と塗料回収タンク１６へ切り換えて供給できるようになっている。   In addition, the air panel 39 provided outside the explosion-proof booth 27 takes in factory air 40, passes through a purifier 41 such as a dryer, air filter, mist separator, etc., and then supplies the pressure-feeding air supply 3. A device 2 is configured. The pressure-feeding air 3 of the pressure-feeding air supply device 2 passes through the supply-side pressure setting device 4 and is then led to a switching valve 44 including a solenoid valve via an on-off valve 42 and a flow meter 43. The switching valve 44 can be switched to the paint supply tank 1 and the paint recovery tank 16 for supply.

前記浄化器４１からのエアの一部は、霧化用エア供給装置１３の霧化用エア１４としてスプレーガン５に供給されるようになっていると共に、シリンダ駆動エア４５としてスプレーガン５に供給してニードル弁の位置を調節する開閉手段１５を制御するようになっている。   A part of the air from the purifier 41 is supplied to the spray gun 5 as the atomizing air 14 of the atomizing air supply device 13 and also supplied to the spray gun 5 as the cylinder drive air 45. Thus, the opening / closing means 15 for adjusting the position of the needle valve is controlled.

更に、前記浄化器４１からのエアの一部は、切換弁４６，４７，４８を介して弁操作エア４９として前記開閉弁２８，３０及び３方弁３３に供給されて弁の切り換えを行なうようになっている。又、前記工場エア４０を取入れて浄化器４１'等を経たエアは、前記攪拌用エア供給装置１１の攪拌用エア１２として攪拌機１０に供給されて攪拌機１０を駆動するようになっている。   Further, a part of the air from the purifier 41 is supplied to the on-off valves 28, 30 and the three-way valve 33 as valve operating air 49 via the switching valves 46, 47, 48 so that the valves are switched. It has become. Further, the air that has taken in the factory air 40 and passed through the purifier 41 ′ and the like is supplied to the agitator 10 as the agitation air 12 of the agitation air supply device 11 to drive the agitator 10.

図３の構成において、前記塗料供給タンク１の塗料ａをエア圧によってスプレーガン５に供給してスプレーガン５に吐出すると共に、霧化用エア供給装置１３からの霧化用エア１４をスプレーガン５に供給し、スプレーガン５から塗料を噴射させることにより塗装作業を行う。この時、スプレーガン５から吐出される塗料は僅かであって、大半の塗料は戻り管７により塗料回収タンク１６に回収されるため、前記塗料供給タンク１内の塗料ａのレベルは低くなる。塗料供給タンク１内の塗料ａのレベルはレベル計５０によって検出されているので、検出レベルが所定値まで低下した場合には、塗料回収タンク１６の塗料ａ'を塗料供給タンク１に戻す循環を行う。   3, the paint a in the paint supply tank 1 is supplied to the spray gun 5 by air pressure and discharged to the spray gun 5, and the atomizing air 14 from the atomizing air supply device 13 is spray gun. The coating operation is performed by spraying paint from the spray gun 5. At this time, the amount of paint discharged from the spray gun 5 is very small, and most of the paint is collected in the paint collection tank 16 by the return pipe 7, so that the level of the paint a in the paint supply tank 1 is lowered. Since the level of the paint a in the paint supply tank 1 is detected by the level meter 50, when the detection level falls to a predetermined value, circulation is performed to return the paint a ′ in the paint collection tank 16 to the paint supply tank 1. Do.

循環を行うには、前記切換弁４４を切り換えて前記塗料供給タンク１に供給していた圧送用エア３を塗料回収タンク１６に供給するようにすると共に、開閉弁２８を開いて循環流路２９により塗料回収タンク１６と塗料供給タンク１を連通させる。すると、塗料回収タンク１６内が圧送用エア３によって加圧されることにより塗料回収タンク１６の塗料ａ'は塗料供給タンク１に戻されるようになる。レベル計５０による検出レベルが所定値まで上昇すると、前記循環は停止され、再び塗装作業を行う。   In order to circulate, the switching valve 44 is switched so that the pressure-feeding air 3 supplied to the paint supply tank 1 is supplied to the paint recovery tank 16, and the on-off valve 28 is opened to circulate the circulation passage 29. Thus, the paint recovery tank 16 and the paint supply tank 1 are communicated. Then, the inside of the paint collection tank 16 is pressurized by the pressure feeding air 3 so that the paint a ′ in the paint collection tank 16 is returned to the paint supply tank 1. When the level detected by the level meter 50 rises to a predetermined value, the circulation is stopped and the painting operation is performed again.

又、上記塗装作業が終了して洗浄を行う場合には、先ず、開閉弁２８を閉、開閉弁３０を開、３方弁３３が戻り管７，７'を連通させた状態として、洗浄水３２を塗料供給タンク１に供給する。次に、開閉弁３０を閉じた後、切換弁４４により圧送用エア３を塗料供給タンク１に供給し、塗料供給タンク１を加圧することにより洗浄水をスプレーガン５を経て塗料回収タンク１６に供給する。これにより、塗料供給タンク１とスプレーガン５は洗浄される。   When cleaning is performed after the painting operation is completed, first, the on-off valve 28 is closed, the on-off valve 30 is opened, and the three-way valve 33 is in communication with the return pipes 7 and 7 '. 32 is supplied to the paint supply tank 1. Next, after closing the on-off valve 30, the switching valve 44 supplies the pressure feeding air 3 to the paint supply tank 1, and pressurizes the paint supply tank 1, so that the washing water passes through the spray gun 5 to the paint recovery tank 16. Supply. Thereby, the paint supply tank 1 and the spray gun 5 are cleaned.

次に、開閉弁２８を開、３方弁３３が戻り管７を閉じた状態として、切換弁４４により圧送用エア３を塗料回収タンク１６に供給し、塗料回収タンク１６を加圧することにより洗浄水を循環流路２９を経て塗料供給タンク１に戻す。これにより塗料回収タンク１６は洗浄される。続いて、開閉弁２８を閉、開閉弁３０を閉、３方弁３３が戻り間７'と洗浄排水管３４を連通させた状態として、切換弁４４により圧送用エア３を塗料供給タンク１に供給し、塗料供給タンク１を加圧することにより塗料供給タンク１の洗浄水を供給管６、戻り管７'を経て洗浄排水管３４から排水タンク３５に排水する。又、上記洗浄操作が終了した後には、洗浄操作における洗浄水３２の供給を停止した状態で、圧送用エア３を前記洗浄操作と同様に塗料供給タンク１と塗料回収タンク１６に送ることにより、塗料供給タンク１、塗料回収タンク１６、供給管６、戻り管７，７'等を乾燥させる乾燥操作を行うことができる。   Next, the on-off valve 28 is opened, the three-way valve 33 is in a state in which the return pipe 7 is closed, the pressure feed air 3 is supplied to the paint recovery tank 16 by the switching valve 44, and the paint recovery tank 16 is pressurized to perform cleaning. Water is returned to the paint supply tank 1 through the circulation channel 29. As a result, the paint recovery tank 16 is washed. Subsequently, the on-off valve 28 is closed, the on-off valve 30 is closed, the three-way valve 33 is in a state where the return space 7 ′ and the washing drain pipe 34 are in communication with each other, and the pressure feed air 3 is supplied to the paint supply tank 1 by the switching valve 44. By supplying and pressurizing the paint supply tank 1, the cleaning water in the paint supply tank 1 is drained from the cleaning drain pipe 34 to the drain tank 35 through the supply pipe 6 and the return pipe 7 ′. Further, after the cleaning operation is completed, the supply of the cleaning water 32 in the cleaning operation is stopped, and the pressure feeding air 3 is sent to the paint supply tank 1 and the paint recovery tank 16 in the same manner as the cleaning operation. A drying operation for drying the paint supply tank 1, the paint recovery tank 16, the supply pipe 6, the return pipes 7 and 7 'can be performed.

一方、図３の構成においては、スプレーガン５から滴下する液滴Ｘの滴下を検出する光センサ３８を備えて、その滴下信号３８ａを制御器２１に入力しているので、制御器２１では、液滴Ｘの滴下間隔によって、スプレーガン５から吐出される塗料の吐出量を計測することができ、よって、図１の構成による作用に加え、計測した塗料の吐出量に基づいて前記塗料供給タンク１を加圧する圧力を調節することにより、スプレーガン５から吐出する塗料の吐出量を更に正確に制御することができる。   On the other hand, in the configuration of FIG. 3, the optical sensor 38 that detects the dropping of the droplet X dropped from the spray gun 5 is provided, and the dropping signal 38 a is input to the controller 21. The amount of paint discharged from the spray gun 5 can be measured by the drop interval of the droplets X. Therefore, in addition to the operation of the configuration of FIG. 1, the paint supply tank is based on the measured amount of paint discharged. By adjusting the pressure for pressurizing 1, the amount of paint discharged from the spray gun 5 can be more accurately controlled.

尚、図３では省略したが、塗料回収タンク１６の塗料ａ'を前記塗料供給タンク１に戻す循環制御、及び洗浄制御、更には霧化用エア１４の供給制御、シリンダ駆動エア４５の供給制御、攪拌用エア１２の供給制御等を、前記制御器２１によって一括して制御するようにしてもよい。   Although omitted in FIG. 3, circulation control and cleaning control for returning the paint a ′ in the paint recovery tank 16 to the paint supply tank 1, supply control for the atomizing air 14, and supply control for the cylinder drive air 45. Further, the supply control of the stirring air 12 and the like may be collectively controlled by the controller 21.

図３の構成では、前記スプレーガン５と、塗料供給タンク１と、塗料回収タンク１６を防爆ブース２７内に備え、更に、塗料の供給をエア圧にて行うと共に、エアの供給を制御する切換弁４４，４６，４７，４８及び制御器２１等を防爆ブース２７の外部に設けるようにしているので、引火性の塗料を用いた塗装作業も安全に行うことができる。   In the configuration of FIG. 3, the spray gun 5, the paint supply tank 1, and the paint collection tank 16 are provided in the explosion-proof booth 27. Further, the supply of paint is performed by air pressure and the switching for controlling the supply of air is performed. Since the valves 44, 46, 47, 48 and the controller 21 are provided outside the explosion-proof booth 27, painting work using flammable paint can be performed safely.

図４は、本発明の塗装装置を更に具体化した他の例を示すものであり、図３と異なる点は、前記塗料回収タンク１６を昇降手段５２により昇降可能に構成した塗料回収タンク１６ａとし、該塗料回収タンク１６ａを前記塗料供給タンク１より高い位置に上昇させることにより、塗料回収タンク１６ａ内の塗料を重力によって塗料供給タンク１に戻すようにした点にある。従って、図４の構成では、図３における圧送用エア３によって塗料回収タンク１６ａ内の塗料を塗料供給タンク１に戻すための構成は省略されている。図４の構成によれば、塗料回収タンク１６ａ内の塗料を塗料供給タンク１に戻すための操作が容易になる。   FIG. 4 shows another example in which the coating apparatus of the present invention is further embodied. The difference from FIG. 3 is that the paint recovery tank 16 is a paint recovery tank 16a that can be moved up and down by the lifting means 52. The paint recovery tank 16a is raised to a position higher than the paint supply tank 1, whereby the paint in the paint recovery tank 16a is returned to the paint supply tank 1 by gravity. Therefore, in the configuration of FIG. 4, the configuration for returning the paint in the paint recovery tank 16 a to the paint supply tank 1 by the pressure-feeding air 3 in FIG. 3 is omitted. According to the configuration of FIG. 4, the operation for returning the paint in the paint collection tank 16 a to the paint supply tank 1 becomes easy.

尚、本発明は上記形態にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In addition, this invention is not limited only to the said form, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

１ 塗料供給タンク
２ 圧送用エア供給装置
３ 圧送用エア
４ 供給側圧力設定器
５ スプレーガン
６ 供給管
７ 戻り管
１３ 霧化用エア供給装置
１４ 霧化用エア
１６ 塗料回収タンク
１６ａ 塗料回収タンク
１７ 回収側圧力設定器
１８ 回収側圧力設定手段
１８' 減圧装置
１９ 制御信号
２０ 制御信号
２１ 制御器
２５ 吐出差圧設定値
２６ タンク間差圧設定値
２７ 防爆ブース
２９ 循環流路
５２ 昇降手段
ａ 供給側の塗料
ａ' 戻り側の塗料 DESCRIPTION OF SYMBOLS 1 Paint supply tank 2 Air supply apparatus for pressure feeding 3 Air for pressure feed 4 Pressure setting device on the supply side 5 Spray gun 6 Supply pipe 7 Return pipe 13 Air supply apparatus for atomization 14 Air for atomization 16 Paint recovery tank 16a Paint recovery tank 17 Recovery side pressure setting device 18 Recovery side pressure setting means 18 'Pressure reducing device 19 Control signal 20 Control signal 21 Controller 25 Discharge differential pressure set value 26 Inter-tank differential pressure set value 27 Explosion-proof booth 29 Circulating flow path 52 Lifting means a Supply side Paint a 'return side paint

Claims (14)

塗料供給タンクに圧力を調整した圧送用エアを供給することにより塗料供給タンク内の塗料をスプレーガンに供給し、塗料の一部をスプレーガンから吐出することにより霧化用エアにより噴射させ、スプレーガンから吐出されない塗料は戻り管により回収するようにしている塗装装置の噴射量制御方法であって、
前記戻り管を塗料回収タンクに接続し、
該塗料回収タンクの圧力を設定して前記塗料供給タンク内の圧力と塗料回収タンク内の圧力との圧力差を調節することによりスプレーガンに供給する塗料の流速を調節する
ことを特徴とする塗装装置の噴射量制御方法。 Supplying the pressure supply air with pressure adjusted to the paint supply tank, the paint in the paint supply tank is supplied to the spray gun, and a part of the paint is ejected from the spray gun to be sprayed by the atomizing air and sprayed. The spray amount control method of the coating device is adapted to collect the paint not discharged from the gun by the return pipe,
Connecting the return pipe to the paint recovery tank;
The paint is characterized in that the flow rate of the paint supplied to the spray gun is adjusted by setting the pressure of the paint recovery tank and adjusting the pressure difference between the pressure in the paint supply tank and the pressure in the paint recovery tank. An injection amount control method for the apparatus. 前記塗料回収タンクを減圧することを特徴とする請求項１に記載の塗装装置の噴射量制御方法。   The method for controlling an injection amount of a coating apparatus according to claim 1, wherein the paint recovery tank is depressurized. 前記スプレーガンの塗料の吐出圧と大気圧との圧力差が吐出差圧設定値になるように前記圧力差を調節することを特徴とする請求項１又は２に記載の塗装装置の噴射量制御方法。   The spray amount control of the coating apparatus according to claim 1 or 2, wherein the pressure difference is adjusted so that a pressure difference between a discharge pressure of the paint of the spray gun and an atmospheric pressure becomes a discharge differential pressure setting value. Method. 前記スプレーガンに吐出される塗料の吐出量を計測し、計測した塗料の吐出量に基づいて前記圧送用エアの圧力を調整することを特徴とする請求項１〜３のいずれか１つに記載の塗装装置の噴射量制御方法。   The discharge amount of the paint discharged to the spray gun is measured, and the pressure of the pumping air is adjusted based on the measured discharge amount of the paint. Method for controlling the injection quantity of the painting equipment. 前記塗料回収タンクの塗料を塗料供給タンクに戻して循環使用することを特徴とする請求項１〜４のいずれか１つに記載の塗装装置の噴射量制御方法。   The spray amount control method for a coating apparatus according to any one of claims 1 to 4, wherein the paint in the paint recovery tank is returned to the paint supply tank for circulation. 前記スプレーガンと、塗料供給タンクと、塗料回収タンクは防爆ブース内に備えられていることを特徴とする請求項１〜５のいずれか１つに記載の塗装装置の噴射量制御方法。   The spray amount control method for a coating apparatus according to claim 1, wherein the spray gun, the paint supply tank, and the paint collection tank are provided in an explosion-proof booth. 塗料を収容する塗料供給タンクと、該塗料供給タンクに供給する圧送用エアの圧力を設定する供給側圧力設定器と、圧送用エアにより塗料供給タンクから供給される塗料の一部を吐出させ吐出しない塗料は戻り管に流動させるスプレーガンとを有する塗装装置の噴射量制御装置であって、
前記戻り管に接続された塗料回収タンクと、
該塗料回収タンクに備えた回収側圧力設定手段と、
タンク間差圧設定値に基づき塗料供給タンクと塗料回収タンクの圧力差を制御する制御器と、
を有することを特徴とする塗装装置の噴射量制御装置。 A paint supply tank that contains paint, a supply-side pressure setting device that sets the pressure of the pressure-feeding air supplied to the paint supply tank, and a part of the paint supplied from the paint supply tank by the pressure-feeding air is discharged and discharged The coating material that is not applied is a spray amount control device of a coating device having a spray gun that flows into the return pipe,
A paint recovery tank connected to the return pipe;
Recovery side pressure setting means provided in the paint recovery tank;
A controller for controlling the pressure difference between the paint supply tank and the paint recovery tank based on the inter-tank differential pressure setting value;
A spray amount control device for a coating apparatus, comprising: 前記回収側圧力設定手段が、塗料回収タンクの圧力を負圧に調節するための減圧装置であることを特徴とする請求項７に記載の塗装装置の噴射量制御装置。   The spray amount control device for a coating apparatus according to claim 7, wherein the recovery side pressure setting means is a pressure reducing device for adjusting the pressure of the paint recovery tank to a negative pressure. 前記制御器が、スプレーガン内の吐出圧と大気圧との圧力差を吐出差圧設定値に調節するようにしたことを特徴とする請求項７又は８に記載の塗装装置の噴射量制御装置。   The spray amount control device for a coating apparatus according to claim 7 or 8, wherein the controller adjusts a pressure difference between a discharge pressure in the spray gun and an atmospheric pressure to a discharge differential pressure setting value. . 前記スプレーガンから塗料を吐出させた時の吐出量を検出する吐出量検出装置を備え、該吐出量検出装置の吐出量検出値を前記制御器に入力して該吐出量検出値に基づき前記圧送用エアの圧力を調節するようにしたことを特徴とする請求項７〜９に記載の塗装装置の噴射量制御装置。   A discharge amount detection device for detecting a discharge amount when the paint is discharged from the spray gun, and the discharge amount detection value of the discharge amount detection device is input to the controller and the pressure feed is based on the discharge amount detection value; 10. The spray amount control device for a coating apparatus according to claim 7, wherein the pressure of the working air is adjusted. 前記塗料回収タンクの塗料を塗料供給タンクに戻す循環流路によって塗料回収タンクと塗料供給タンクの間を接続したことを特徴とする請求項７〜１０のいずれか１つに記載の塗装装置の噴射量制御装置。   The spray of the coating apparatus according to any one of claims 7 to 10, wherein the paint recovery tank and the paint supply tank are connected by a circulation channel for returning the paint in the paint recovery tank to the paint supply tank. Quantity control device. 前記塗料回収タンクに前記圧送用エアを供給して塗料回収タンクの塗料を塗料供給タンクに戻すようにしたことを特徴とする請求項１１に記載の塗装装置の噴射量制御装置。   12. The spray amount control device for a coating apparatus according to claim 11, wherein the pressure-feeding air is supplied to the paint recovery tank so that the paint in the paint recovery tank is returned to the paint supply tank. 前記塗料回収タンクを昇降可能に構成し、該塗料回収タンクを上昇させることにより塗料回収タンク内の塗料を重力によって塗料供給タンクに戻すようにしたことを特徴とする請求項１１に記載の塗装装置の噴射量制御装置。   12. The coating apparatus according to claim 11, wherein the paint recovery tank is configured to be movable up and down, and the paint in the paint recovery tank is returned to the paint supply tank by gravity by raising the paint recovery tank. Injection amount control device. 前記スプレーガンと、塗料供給タンクと、塗料回収タンクは防爆ブース内に備えられていることを特徴とする請求項７〜１３のいずれか１つに記載の塗装装置の噴射量制御装置。   The spray amount control device for a coating apparatus according to any one of claims 7 to 13, wherein the spray gun, the paint supply tank, and the paint recovery tank are provided in an explosion-proof booth.
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