JP4605413B2 - A method for conveying powder in powder coating - Google Patents

A method for conveying powder in powder coating Download PDF

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JP4605413B2
JP4605413B2 JP37667499A JP37667499A JP4605413B2 JP 4605413 B2 JP4605413 B2 JP 4605413B2 JP 37667499 A JP37667499 A JP 37667499A JP 37667499 A JP37667499 A JP 37667499A JP 4605413 B2 JP4605413 B2 JP 4605413B2
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Prior art keywords
powder
ejector pump
amount
conveying
suction
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JP2001170551A (en
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隆 渡辺
茂樹 坂口
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ノードソン株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder

Description

【０００１】
【発明の属する技術分野】
本発明は、粉体塗装における粉体の微量搬送方法に係わり、特に比較的小型のモータコアの表面に、絶縁性粉体を塗布して絶縁性薄膜層を形成する際の、粉体塗装に適する粉体の微量搬送方法に関するものである。
【０００２】
【従来の技術】
比較的小型のモータコアの表面に、絶縁性粉体を塗布して絶縁性薄膜層を形成する技術が特開平９−２８５０７８号公報、特開平１０−２５７７２７号公報等に開示されている。そして最近では、モータの小型化、高性能化が進み、被膜厚みも３０〜５０μｍが要求され、またモータコア１個当りの粉体塗布量は０．０５〜０．２０ｇと極めて微小量の粉体塗布が要求されるようになってきた。
【０００３】
ところで、これらの粉体塗布で用いられていた粉体塗装装置は一般に図２に示すような方法で行われていた。すなわち図２は従来の粉体塗装装置を示す図であり、符号１は空気吹き込み型の流動床式の粉体タンクであり、該粉体タンク１は管路２を介して制御装置３で圧力や流量が調整された圧縮気体４を、前記粉体タンク１の底部に設けられている空気室５に導入し、通気性の多孔質板６を通して粉体タンク１内へ吹き込み、多孔質板６の上側にある粉体７が流動状態に貯溜されるものである。
【０００４】
また８は前記粉体タンク１の上蓋９上に設置されたエゼクタポンプであり、該エゼクタポンプ８は、制御装置３によって圧力等が調整されたエゼクト用の圧縮気体が管路１０を介して供給される。そして、エゼクタポンプの吸引口に取り付けられて粉体タンク１内の粉体流動層内まで挿入された吸引管１１の先端からエゼクタポンプ８内のベンチュリー作用により、流動状態の粉体７を吸引し、更にホース等の管路１２を介して噴出ガン１３へと粉体７を搬送する。
【０００５】
そして噴出ガン１３へ運ばれた粉体７は、噴出ガン１３の内部で摩擦による静電気の帯電あるいは図示していないが高電圧電流によるコロナ放電によって静電気的に帯電されて、噴出ガン１３の先端から被塗物、例えばモータコアに向けて噴出される。１４は、粉体タンク１内における流動状態の粉体７のレベルを監視するための粉体レベル検出器である。
【０００６】
【発明が解決しようとする課題】
このような粉体塗装装置において、噴出ガン１３から噴出する粉体の噴出量を調節するには、エゼクタポンプ８へ供給する圧縮気体すなわちエゼクト用気体の供給量を調節することによって行われる。しかし、前述した比較的小型のモータコアへの粉体塗布としては、エゼクト用気体の噴出量をどんなに小さく絞り込んでも粉体の噴出量はモータコアに対する適量を越えたものに成ってしまう。
【０００７】
そこで粉体の噴出量をすくなくするため、エゼクタポンプへの圧縮気体の供給以外に、粉体の搬送系内へ希釈用の気体を吹き込み、粉体を搬送する気体内における粉体密度を低下させて粉体搬送量を調節する方法がとられている。このような粉体搬送系内への希釈用気体の吹き込み方法には、主にエゼクタポンプの吸引側で希釈気体を吹き込む方法とエゼクタポンプの吐出側で希釈気体を吹き込む方法とが知られている。エゼクタポンプの吸引側で希釈気体を吹き込む方法としては、例えば特開平１０−２９９７００号公報に開示されるもの等があり、またエゼクタポンプの吐出側で希釈気体を吹き込む方法としては、例えば特開平１５５３４６号公報に開示されたもの等がある。
【０００８】
前述した希釈気体を添加した粉体の搬送方法においても、最近の比較的小型のモータコアの塗装には、十分な満足は得られていなかった。すなわち最近の小型モータコアの粉体塗装では、毎分１０ｇ以下の量の粉体の搬送が求められるが、毎分１０ｇ以下の搬送になると、粉体粒子が搬送管路内で失速して管路内に滞留したり、あるいは吐出量が脈動したりして、安定した吐出が得られなかった。また粉体の搬送量を安定させるために、搬送気体の風量を上げると、一旦被塗物に付着した粉体までも吹き飛ばしてしまうことになり、付着効率が低下すると言う問題があった。
【０００９】
すなわち、本願発明は、前記した問題点に鑑みてなされたものであり、粉体塗装における粉体の搬送方法において、エゼクタポンプを用いる粉体の搬送であって毎分１０ｇ以下という微量の粉体搬送においても、搬送量にばらつきがなく、安定した搬送量を確保できる粉体の微量搬送方法を提供することを目的とするものである。
【００１０】
【課題を解決するための手段】
前記した課題を解決するために、本願発明では次のような方法とした。以下、理解を助けるため後述の実施例に用いた符号を併記して説明する。すなわち、気体吹き込み型流動床式の粉体タンク（１）から、エゼクタポンプ（８）を用いて微量の粉体を噴出ガン（１３）へ搬送する方法であって、エゼクタポンプの吸引が粉体タンク内の粉体流動層（７ａ）のレベル面（Ｌ）より上に浮遊状態すなわちエアロゾル状態で存在する粉体粒子（Ｐ）のみを吸引して搬送するようにしたことを特徴とする、粉体塗装における粉体の微量搬送方法とした。また前記方法において、エゼクタポンプの吸引口部に吸引量調整機構の設けられているエゼクタポンプを用いることを特徴とする、粉体塗装における粉体の微量搬送方法とした。
【００１１】
本願発明では、気体吹き込み型流動床式の粉体タンク内に流動状態に維持された粉体の、流動層のレベル面の上に浮遊状態すなわち粉体エアロゾル状態で存在する粉体粒子を、エゼクタポンプで吸引して搬送するようにしたものであり、これにより従来の流動層内の粉体を搬送するのに比べて、搬送する気体中に含まれる粉体粒子の密度が極めて低いので、微量の粉体を安定して搬送することができる。更に、エゼクタポンプの吸引口部に吸引量調整機構の設けられているエゼクタポンプを用いることにより、粉体の搬送量を任意に調整することができる。
【００１２】
【発明の実施の形態】
以下本発明の実施例を示す図面を用いて、本願発明の実施の形態を説明する。
すなわち図１は、本発明による粉体塗装における粉体の微量搬送方法の全体構成を示す面図である。なお従来技術を示した図２と同一機能を果たす部分については、同一符号を用いて説明する。
【００１３】
図におい符号１は空気吹き込み型の流動床式の粉体タンクであり、該粉体タンク１は管路２を介して制御装置３で圧力や流量が調整された圧縮気体４を、前記粉体タンク１の底部に設けられた空気室５に導入し、通気性の多孔質板６を通して粉体タンク１内へ吹き込み、多孔質板６の上側にある粉体７が流動状態に貯溜されるものである。そして流動状態の粉体７は、液体と同じような流動性のある挙動を示し、あるレベルの高さまで流動層７ａを形成し、該流動層７ａのレベル面Ｌの上にも、浮遊状態すなわちエアロゾル化した粉体粒子Ｐが存在する。
【００１４】
８は前記粉体タンク１の上蓋９上に設置されたエゼクタポンプであり、該エゼクタポンプ８には制御装置３によって圧力等が調整されたエゼクト用圧縮気体が管路１０介して供給される。そしてエゼクタポンプ８内のベンチュリー作用により、粉体タンク１内において粉体の流動層７ａのレベル面Ｌの上に浮遊状態すなわちエアロゾル状態の粉体粒子Ｐを、吸引して噴出ガン１３へと搬送する。
【００１５】
そして噴出ガン１３へ運ばれた粉体粒子Ｐは、噴出ガン１３の内部で摩擦による静電気の帯電あるいは図示していないが高電圧電流によるコロナ放電によって静電気的に帯電されて、噴出ガン１３の先端から被塗物、例えばモータコアに向けて噴出される。１４は、粉体タンク１内における粉体流動層７ａのレベル面Ｌを監視するための粉体レベル検出器である。
【００１６】
そしてエゼクタポンプ８の吸引口部には、吸引量調整機構１５が設けられている。該吸引量調整機構１５はエゼクタポンプ８の吸引力でエゼクタポンプ内へ外気を吸引する吸引ノズル１６と、該吸引ノズル１６の先端に外気の吸引量を調整する絞り弁機構１７とで構成される。そして絞り弁機構１７を閉じると、エゼクタポンプ８の吸引は、全量がエアロゾル状態の粉体粒子Ｐとなるが、絞り弁機構１７の開度を上げてゆくと外気の吸引量も開度に比例して徐々に大きくなり、その分エアロゾル状態の粉体粒子Ｐの吸引量が減少する。
【００１７】
【発明の効果】
以上説明したように、本願発明の粉体塗装における粉体の微量搬送方法によれば、気体吹き込み型流動床式の粉体タンク内の、流動層のレベル面の上に浮遊状態すなわち粉体エアロゾル状態で存在する粉体粒子のみを、エゼクタポンプで吸引して搬送するので、従来の流動層内の粉体を搬送するのに比べて、搬送する気体中に含まれる粉体粒子の密度が極めて低いので、微量の粉体を安定して搬送することができる。更に、エゼクタポンプの吸引口部に吸引量調整機構の設けられているエゼクタポンプを用いることにより、粉体の搬送量を任意に調整することができる。そして比較的小型のモータコアの絶縁被膜形成おいて、毎分１０ｇ以下という微量の粉体搬送においても、搬送量にばらつきや脈動もなく、安定した粉体の微量搬送方法を提供することができる。
【図面の簡単な説明】
【図１】本発明による粉体塗装における粉体の微量搬送方法の全体構成を示す図。
【図２】従来の粉体塗装装置を示す図。
【符号の説明】
１…粉体タンク、３…制御装置、６…多孔質板、７…粉体、８…エゼクタポンプ、１３…噴出ガン、１５…吸引量調整機構、Ｌ…流動層のレベル面、Ｐ…エアロゾル状態の粉体粒子。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for conveying a small amount of powder in powder coating, and is particularly suitable for powder coating when an insulating thin film layer is formed by applying insulating powder on the surface of a relatively small motor core. The present invention relates to a method for conveying a small amount of powder.
[0002]
[Prior art]
Techniques for forming an insulating thin film layer by applying insulating powder on the surface of a relatively small motor core are disclosed in JP-A-9-285078 and JP-A-10-257727. Recently, motors have become smaller and have higher performance, and a coating thickness of 30 to 50 μm has been required, and the amount of powder coated per motor core is 0.05 to 0.20 g, which is a very small amount of powder. Application has come to be required.
[0003]
By the way, the powder coating apparatus used in these powder coatings is generally performed by a method as shown in FIG. That is, FIG. 2 is a view showing a conventional powder coating apparatus. Reference numeral 1 is an air blowing type fluidized bed type powder tank. The powder tank 1 is pressured by a control device 3 via a pipe 2. The compressed gas 4 whose flow rate is adjusted is introduced into the air chamber 5 provided at the bottom of the powder tank 1 and blown into the powder tank 1 through the air-permeable porous plate 6. Is stored in a fluidized state.
[0004]
Reference numeral 8 denotes an ejector pump installed on the upper lid 9 of the powder tank 1, and the ejector pump 8 supplies a compressed gas for ejecting whose pressure or the like is adjusted by the control device 3 through a pipe 10. Is done. The fluidized powder 7 is sucked by the venturi action in the ejector pump 8 from the tip of the suction pipe 11 attached to the suction port of the ejector pump and inserted into the powder fluidized bed in the powder tank 1. Further, the powder 7 is conveyed to the ejection gun 13 through a pipe line 12 such as a hose.
[0005]
The powder 7 transported to the ejection gun 13 is electrostatically charged by friction inside the ejection gun 13 due to friction or corona discharge due to high voltage current (not shown), and from the tip of the ejection gun 13. It is ejected toward the object to be coated, for example, the motor core. Reference numeral 14 denotes a powder level detector for monitoring the level of the powder 7 in a fluid state in the powder tank 1.
[0006]
[Problems to be solved by the invention]
In such a powder coating apparatus, the amount of powder ejected from the ejection gun 13 is adjusted by adjusting the amount of compressed gas supplied to the ejector pump 8, that is, the amount of ejecting gas supplied. However, in the above-described powder coating on a relatively small motor core, the amount of powder ejection exceeds an appropriate amount for the motor core, no matter how small the ejection amount of the ejection gas is reduced.
[0007]
Therefore, in order to reduce the amount of powder ejected, in addition to supplying compressed gas to the ejector pump, a dilution gas is blown into the powder transport system to reduce the powder density in the gas transporting powder. The method of adjusting the amount of powder transport is taken. As a method for blowing dilution gas into such a powder conveyance system, a method of blowing dilution gas mainly on the suction side of the ejector pump and a method of blowing dilution gas on the discharge side of the ejector pump are known. . As a method for blowing dilution gas on the suction side of the ejector pump, there is a method disclosed in, for example, Japanese Patent Application Laid-Open No. 10-299700, and as a method for blowing dilution gas on the discharge side of the ejector pump, for example, Japanese Patent Application Laid-Open No. 155346. There are those disclosed in the Gazette.
[0008]
Even in the above-described method for conveying a powder to which a diluent gas has been added, sufficient satisfaction has not been achieved in the recent coating of relatively small motor cores. That is, in recent powder coating of small motor cores, it is required to transport a quantity of powder of 10 g or less per minute. Stable discharge could not be obtained due to stagnation in the inside or pulsation of the discharge amount. In addition, if the air flow rate of the conveying gas is increased in order to stabilize the powder conveyance amount, there is a problem that even the powder once adhering to the object to be coated is blown away, and the adhesion efficiency is lowered.
[0009]
That is, the present invention has been made in view of the above-mentioned problems, and in the powder conveying method in powder coating, the powder is conveyed using an ejector pump and is a very small amount of powder of 10 g or less per minute. It is an object of the present invention to provide a method for conveying a small amount of powder that can ensure a stable conveyance amount without variation in the conveyance amount.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention adopts the following method. Hereinafter, in order to help understanding, the symbols used in the examples described later are also described. That is, a method of conveying a small amount of powder from a gas blowing type fluidized bed type powder tank (1) to an ejection gun (13) using an ejector pump (8), wherein the suction of the ejector pump is powder. A powder characterized in that only powder particles (P) existing in a floating state, that is, in an aerosol state, are sucked and conveyed above the level surface (L) of the powder fluidized bed (7a) in the tank. A method for conveying a small amount of powder in body coating was adopted. In the above method, a method for conveying a small amount of powder in powder coating is characterized in that an ejector pump having a suction amount adjusting mechanism is provided at the suction port of the ejector pump.
[0011]
In the invention of the present application, powder particles that are maintained in a fluidized state in a gas blowing type fluidized bed type powder tank and that exist in a floating state, that is, in a powder aerosol state on the level surface of the fluidized bed, are ejected. Since the density of the powder particles contained in the gas to be transported is extremely low compared to the conventional method of transporting the powder in the fluidized bed, the amount of powder particles is very small. Can be stably conveyed. Furthermore, by using an ejector pump in which a suction amount adjusting mechanism is provided at the suction port of the ejector pump, the amount of powder transport can be arbitrarily adjusted.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings showing examples of the present invention.
That is, FIG. 1 is a plan view showing the overall configuration of a method for conveying a small amount of powder in powder coating according to the present invention. In addition, the part which fulfill | performs the same function as FIG. 2 which showed the prior art is demonstrated using the same code | symbol.
[0013]
In the figure, reference numeral 1 is an air blowing type fluidized bed type powder tank. The powder tank 1 is supplied with compressed gas 4 whose pressure and flow rate are adjusted by a control device 3 through a pipe 2 and the powder. What is introduced into the air chamber 5 provided at the bottom of the tank 1 and blown into the powder tank 1 through the air-permeable porous plate 6, and the powder 7 on the upper side of the porous plate 6 is stored in a fluidized state. It is. The powder 7 in a fluidized state exhibits a fluid behavior similar to that of a liquid, forms a fluidized bed 7a up to a certain level, and floats on the level surface L of the fluidized bed 7a. Aerosolized powder particles P are present.
[0014]
Reference numeral 8 denotes an ejector pump installed on the upper lid 9 of the powder tank 1. The ejector pump 8 is supplied with compressed gas for ejection whose pressure is adjusted by the control device 3 through a pipe 10. Then, by the venturi action in the ejector pump 8, the powder particles P in the floating state, that is, the aerosol state, are sucked and transported to the ejection gun 13 in the powder tank 1 on the level surface L of the fluidized bed 7 a of the powder. To do.
[0015]
The powder particles P transported to the ejection gun 13 are electrostatically charged by friction inside the ejection gun 13 due to friction or corona discharge due to a high voltage current (not shown), and the tip of the ejection gun 13 is charged. Is ejected toward the object to be coated, for example, the motor core. Reference numeral 14 denotes a powder level detector for monitoring the level surface L of the powder fluidized bed 7 a in the powder tank 1.
[0016]
A suction amount adjusting mechanism 15 is provided at the suction port of the ejector pump 8. The suction amount adjusting mechanism 15 includes a suction nozzle 16 that sucks outside air into the ejector pump by the suction force of the ejector pump 8, and a throttle valve mechanism 17 that adjusts the suction amount of the outside air at the tip of the suction nozzle 16. . When the throttle valve mechanism 17 is closed, the suction of the ejector pump 8 becomes the powder particles P in the aerosol state. As the throttle valve mechanism 17 is opened, the amount of outside air is proportional to the opening. The amount of suction of the powder particles P in the aerosol state decreases accordingly.
[0017]
【The invention's effect】
As described above, according to the method for conveying a small amount of powder in the powder coating of the present invention, the floating state on the level surface of the fluidized bed in the gas blowing type fluidized bed type powder tank, that is, the powder aerosol Since only the powder particles present in the state are sucked and transported by the ejector pump, the density of the powder particles contained in the transported gas is extremely high compared to transporting the powder in the conventional fluidized bed. Since it is low, a very small amount of powder can be stably conveyed. Furthermore, by using an ejector pump in which a suction amount adjusting mechanism is provided at the suction port of the ejector pump, the amount of powder transport can be arbitrarily adjusted. In addition, in the formation of an insulating coating on a relatively small motor core, even when a small amount of powder is transported at a rate of 10 g or less per minute, there is no variation or pulsation in the transport amount, and a stable powder transport method can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing the overall configuration of a method for conveying a small amount of powder in powder coating according to the present invention.
FIG. 2 is a view showing a conventional powder coating apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Powder tank, 3 ... Control apparatus, 6 ... Porous board, 7 ... Powder, 8 ... Ejector pump, 13 ... Jetting gun, 15 ... Suction amount adjusting mechanism, L ... Level surface of fluidized bed, P ... Aerosol State powder particles.

Claims (2)

気体吹き込み型流動床式の粉体タンク（１）から、エゼクタポンプ（８）を用いて微量の粉体を噴出ガン（１３）へ搬送する方法であって、エゼクタポンプの吸引が粉体タンク内の粉体流動層（７ａ）のレベル面（Ｌ）より上に浮遊状態すなわち粉体エアロゾルで存在する粉体粒子（Ｐ）のみを吸引して搬送するようにしたことを特徴とする、粉体塗装における粉体の微量搬送方法。A method of conveying a small amount of powder from a gas blowing type fluidized bed type powder tank (1) to an ejection gun (13) by using an ejector pump (8), and suction of the ejector pump is performed in the powder tank. A powder characterized in that only the powder particles (P) existing in a floating state, ie, powder aerosol, are sucked and conveyed above the level surface (L) of the powder fluidized bed (7a). A small amount of powder transport method in painting. エゼクタポンプの吸引口部に吸引量調整機構（１５）の設けられているエゼクタポンプを用いることを特徴とする、請求項１に記載の粉体塗装における粉体の微量搬送方法。  The method for conveying a trace amount of powder in powder coating according to claim 1, wherein an ejector pump having a suction amount adjusting mechanism (15) provided at a suction port of the ejector pump is used.
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JP5557437B2 (en) * 2008-10-01 2014-07-23 旭サナック株式会社 Powder supply device and powder coating device
CN102626685A (en) * 2012-04-28 2012-08-08 广州卓迅包装机械有限公司 Pressurized-jet powder supply system
CN103028530A (en) * 2012-12-05 2013-04-10 中山市君禾机电设备有限公司 Powder supply center with integrated powder pump and without powder barrel
DE112014002056B4 (en) * 2013-04-20 2023-06-01 Mtek-Smart Corp. Method of applying or dispensing powder or granular material
JP6474062B2 (en) * 2014-07-03 2019-02-27 株式会社エアーサーフ Powder sprayer
JP6481154B2 (en) * 2014-10-18 2019-03-13 エムテックスマート株式会社 How to apply powder
CN107755118A (en) * 2017-11-23 2018-03-06 中山市君禾机电设备有限公司 A kind of powder bucket structure
JP2022049585A (en) 2020-09-16 2022-03-29 パナソニックＩｐマネジメント株式会社 Powder layer composite, coating film, powder coating method, and powder coating apparatus

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