JP7565835B2

JP7565835B2 - Painting Equipment

Info

Publication number: JP7565835B2
Application number: JP2021043928A
Authority: JP
Inventors: 仁志柳谷; 直岐冨田; 健吾明渡; 尚紀安東
Original assignee: Kurimoto Ltd
Current assignee: Kurimoto Ltd
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2024-10-11
Anticipated expiration: 2041-03-17
Also published as: JP2022143430A

Description

本発明は、塗装装置に関する。 The present invention relates to a painting device.

上下水道に用いられる鋳鉄管などの金属管において、防食性などの観点から、エポキシ樹脂によって金属管の内面を塗装することがある。塗装の際に、高価なエポキシ樹脂の割合を低減するために、塗装材に珪砂などの安価な充填材を含めることもある。特許文献１には、粉体エポキシ樹脂を供給して金属管の内面に吹き付ける塗料供給機構と、珪砂を供給して金属管の内面に吹き付ける金属管の内面に吹き付ける珪砂供給機構とを備える塗装装置が開示されている。特許文献１の塗装装置によれば、金属管の内面にエポキシ樹脂と珪砂が混合された塗膜を形成することができる。 In metal pipes such as cast iron pipes used for water supply and sewerage, the inner surface of the metal pipe may be painted with epoxy resin from the viewpoint of corrosion resistance. When painting, an inexpensive filler such as silica sand may be included in the paint material to reduce the proportion of expensive epoxy resin. Patent Document 1 discloses a painting device that includes a paint supply mechanism that supplies powdered epoxy resin and sprays it onto the inner surface of the metal pipe, and a silica sand supply mechanism that supplies silica sand and sprays it onto the inner surface of the metal pipe. The painting device of Patent Document 1 can form a coating film of a mixture of epoxy resin and silica sand on the inner surface of the metal pipe.

特開２０２０－１３１１５１号公報JP 2020-131151 A

特許文献１では、比重の異なる粉体エポキシ樹脂と珪砂をそれぞれ均一に金属管の内面に吹き付けるために、塗料供給機構および珪砂供給機構が別々に粉体エポキシ樹脂および珪砂を別々に吹き付けている。この場合、粉体エポキシ樹脂を吹き付けるための塗料供給機構の配管と、珪砂を吹き付けるための珪砂供給機構の配管とを別々に設けているので、塗装装置全体として、配管経路が冗長になってしまう。 In Patent Document 1, in order to spray powdered epoxy resin and silica sand, which have different specific gravities, evenly onto the inner surface of the metal pipe, a paint supply mechanism and a silica sand supply mechanism spray the powdered epoxy resin and silica sand separately. In this case, the piping of the paint supply mechanism for spraying the powdered epoxy resin and the piping of the silica sand supply mechanism for spraying the silica sand are provided separately, which results in redundant piping routes for the entire coating device.

本発明は、かかる問題点に鑑みて、比重の異なる粉体を簡単な配管経路で吹き付けることが可能な塗装装置を提供することを目的とする。 In view of these problems, the present invention aims to provide a coating device that can spray powders of different specific gravities using a simple piping path.

本発明の一実施形態に係る塗装装置は、圧縮気体を用いて、比重の異なる第１粉体および第２粉体を対象物に向けて吐出することで、前記対象物を塗装する塗装装置であって、前記第１粉体を第１供給量で供給する第１供給部と、前記第２粉体を第２供給量で供給する第２供給部と、前記第１供給部および前記第２供給部に対して鉛直下方側に位置し、前記圧縮気体の流路を有する搬送部と、前記流路の下流側で前記搬送部に接続され、前記第１粉体および前記第２粉体を前記対象物に向けて吐出する吐出部とを備え、前記搬送部は、鉛直上方側に、前記流路と連通し、前記第１供給部および前記第２供給部から前記第１粉体および前記第２粉体が前記流路に落し込まれる、前記第１粉体および前記第２粉体で共通する搬入口を有し、前記搬送部は、前記搬入口から前記流路にそれぞれ落し込まれる前記第１粉体および前記第２粉体を前記圧縮気体によって前記流路の下流側に搬送し、前記吐出部は、前記第１供給量および前記第２供給量に応じた所定の割合で、前記搬送部から前記圧縮気体によって搬送される前記第１粉体および前記第２粉体を前記対象物に向けて吐出する。 A coating device according to one embodiment of the present invention is a coating device that uses compressed gas to discharge a first powder and a second powder having different specific gravities toward an object, thereby coating the object. The coating device includes a first supply unit that supplies the first powder at a first supply amount, a second supply unit that supplies the second powder at a second supply amount, a conveying unit that is located vertically below the first supply unit and the second supply unit and has a flow path for the compressed gas, and a discharge unit that is connected to the conveying unit on the downstream side of the flow path and discharges the first powder and the second powder toward the object. The conveying unit is arranged vertically above the first supply unit and the second supply unit. On one side, the flow path has an inlet common to the first powder and the second powder, which is connected to the flow path and through which the first powder and the second powder are dropped from the first supply unit and the second supply unit into the flow path, and the transport unit transports the first powder and the second powder, which are respectively dropped into the flow path from the inlet, to the downstream side of the flow path by the compressed gas, and the discharge unit discharges the first powder and the second powder transported by the compressed gas from the transport unit toward the target object at a predetermined ratio according to the first supply amount and the second supply amount.

前記第１粉体は、前記対象物を塗装する塗料によって構成され、前記第２粉体は、前記塗料に添加する充填材によって構成されてもよい。 The first powder may be composed of a paint used to paint the object, and the second powder may be composed of a filler added to the paint.

前記第１供給部および前記第２供給部と前記搬送部との間に、前記第１供給部および前記第２供給部から前記搬送部に前記第１粉体および前記第２粉体を落とし込む投入部をさらに備え、前記投入部は、前記第１粉体および前記第２粉体が投入される投入口と、前記第１粉体および前記第２粉体が排出される排出口とを繋ぐ、管状通路を有し、前記管状通路は、前記第１供給部および前記第２供給部と離間して設けられてもよい。 The apparatus may further include an input section between the first supply section and the second supply section and the transport section, which drops the first powder and the second powder from the first supply section and the second supply section onto the transport section, and the input section may have a tubular passage connecting an input port through which the first powder and the second powder are input and an output port through which the first powder and the second powder are output, and the tubular passage may be provided at a distance from the first supply section and the second supply section.

前記管状通路は、前記投入口と前記排出口との間に設けられ、前記投入部に投入される前記第１粉体および前記第２粉体が当接する当接部を有し、前記投入口から投入される前記第１粉体および前記第２粉体が、前記当接部に当接することで、少なくとも前記搬送方向への運動成分を増加させるように前記第１粉体および前記第２粉体の運動方向を変化させた後に、前記排出口から排出されることで、前記流路に投入されるように構成されてもよい。 The tubular passage may be provided between the inlet and the outlet, and may have an abutment portion with which the first powder and the second powder fed into the inlet abut, and the first powder and the second powder fed from the inlet may be discharged from the outlet after the first powder and the second powder have changed their directions of motion so as to increase at least the component of motion in the conveying direction by abutting on the abutment portion, thereby being fed into the flow path.

本発明の一実施形態に係る塗装装置によれば、比重の異なる粉体を簡単な配管経路で吹き付けることができる。 The coating device according to one embodiment of the present invention can spray powders with different specific gravities using a simple piping path.

本発明の一実施形態に係る塗装装置を示す、側面から見た、模式的な部分断面図である。1 is a schematic partial cross-sectional view showing a coating device according to an embodiment of the present invention, as viewed from the side; 本発明の一実施形態に係る塗装装置の主要部を示す、側面から見た、模式的な拡大断面図である。1 is a schematic enlarged cross-sectional view showing a main part of a coating device according to an embodiment of the present invention, as viewed from the side. 本発明の参考例に係る塗装装置の主要部を示す、側面から見た、模式的な拡大断面図である。1 is a schematic enlarged cross-sectional view showing a main part of a coating device according to a reference example of the present invention, as viewed from the side.

以下、添付図面を参照して、本発明の一実施形態に係る塗装装置を説明する。なお、以下に示される実施形態は、あくまで一例であり、本発明の塗装装置は、以下の実施形態に限定されるものではない。なお、本明細書において、「Ａに垂直」およびこれに類する表現は、Ａに対して完全に垂直な方向のみを指すのではなく、Ａに対して略垂直であることを含んで指すものとする。また、本明細書において、「Ｂに平行」およびこれに類する表現は、Ｂに対して完全に平行な方向のみを指すのではなく、Ｂに対して略平行であることを含んで指すものとする。また、本明細書において、「Ｃ形状」およびこれに類する表現は、完全なＣ形状のみを指すのではなく、Ｃ形状の角部が面取りされた形状など、見た目にＣ形状を連想させる形状（略Ｃ形状）を含んで指すものとする。 Below, a coating device according to one embodiment of the present invention will be described with reference to the attached drawings. Note that the embodiment shown below is merely an example, and the coating device of the present invention is not limited to the following embodiment. Note that in this specification, "perpendicular to A" and similar expressions do not only refer to a direction completely perpendicular to A, but also refer to a direction that is approximately perpendicular to A. Also, in this specification, "parallel to B" and similar expressions do not only refer to a direction completely parallel to B, but also refer to a direction that is approximately parallel to B. Also, in this specification, "C-shape" and similar expressions do not only refer to a perfect C-shape, but also refer to a shape that visually resembles a C-shape (approximately a C-shape), such as a shape with chamfered corners of a C-shape.

［本発明の一実施形態に係る塗装装置］
図１は、本発明の一実施形態に係る塗装装置１を示している。図１に示されるように、塗装装置１は、圧縮気体Ｇを用いて、第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに向けて吐出することで、対象物Ｔを塗装する。ここで、本明細書において、「圧縮」は、コンプレッサなどを用いて加圧することで、気体の体積を収縮させることを指す。また、本明細書において、「圧縮気体」は、加圧によって体積を収縮させた気体を指す。圧縮気体Ｇは、圧縮状態から解放されると、気流を生じる。塗装装置１は、この気流を用いて第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに向けて吐出する。 [Painting device according to one embodiment of the present invention]
FIG. 1 shows a coating apparatus 1 according to an embodiment of the present invention. As shown in FIG. 1, the coating apparatus 1 uses compressed gas G to discharge a first powder S1 and a second powder S2 toward the object T, thereby coating the object T. Here, in this specification, "compression" refers to contracting the volume of gas by pressurizing the gas using a compressor or the like. Also, in this specification, "compressed gas" refers to gas whose volume has been contracted by pressurization. When the compressed gas G is released from the compressed state, it generates an airflow. The coating apparatus 1 uses this airflow to discharge the first powder S1 and the second powder S2 toward the object T.

塗装装置１に用いられる圧縮気体Ｇは、特に限定されないが、本実施形態では、圧縮空気である。しかし、圧縮される気体は、特に限定されず、希ガスなどのその他の気体であってもよい。 The compressed gas G used in the coating device 1 is not particularly limited, but in this embodiment, it is compressed air. However, the gas to be compressed is not particularly limited, and may be other gases such as rare gases.

塗装装置１によって吐出される第１粉体Ｓ１および第２粉体Ｓ２は、比重が異なる。本実施形態では、第２粉体Ｓ２は、第１粉体Ｓ１より比重が大きい。第１粉体Ｓ１および第２粉体Ｓ２の種類は、対象物Ｔを塗装可能であれば、特に限定されない。本実施形態では、第１粉体Ｓ１は、対象物Ｔを塗装する塗料によって構成され、第２粉体Ｓ２は、塗料に添加する充填材によって構成されている。より具体的には、第１粉体Ｓ１は、比重が比較的軽い粉体エポキシ樹脂（たとえば、比重：１．５）によって構成され、第２粉体Ｓ２は、比重が比較的重い珪砂（たとえば、比重：２．５）によって構成されている。ここで、本明細書において、「珪砂」は、石英を主成分（たとえば、石英の含有率が８０ｗｔ％以上）とする粉体であり、表面が任意の材料でコーティングされた珪砂を含む。また、本明細書において、「粉体」は、たとえば、平均粒径が５μｍ～１０００μｍの粉状体であり、好ましくは、平均粒径が１０μｍ～５００μｍの粉状体であり、より好ましくは、平均粒径が５０μｍ～２００μｍの粉状体である。第２粉体Ｓ２が珪砂である場合、たとえば、７号珪砂または８号珪砂を用いることができる。しかし、第１粉体Ｓ１および第２粉体Ｓ２は、比重の異なる２種類の粉体塗料によって構成されるなど、その他の粉体から構成されてもよい。 The first powder S1 and the second powder S2 discharged by the coating device 1 have different specific gravities. In this embodiment, the second powder S2 has a larger specific gravity than the first powder S1. The types of the first powder S1 and the second powder S2 are not particularly limited as long as they can coat the object T. In this embodiment, the first powder S1 is composed of a paint for coating the object T, and the second powder S2 is composed of a filler added to the paint. More specifically, the first powder S1 is composed of a powder epoxy resin having a relatively light specific gravity (for example, specific gravity: 1.5), and the second powder S2 is composed of silica sand having a relatively heavy specific gravity (for example, specific gravity: 2.5). Here, in this specification, "silica sand" is a powder containing quartz as a main component (for example, a quartz content of 80 wt% or more), and includes silica sand whose surface is coated with any material. In addition, in this specification, "powder" refers to, for example, a powder having an average particle size of 5 μm to 1000 μm, preferably a powder having an average particle size of 10 μm to 500 μm, and more preferably a powder having an average particle size of 50 μm to 200 μm. When the second powder S2 is silica sand, for example, silica sand No. 7 or silica sand No. 8 can be used. However, the first powder S1 and the second powder S2 may be composed of other powders, such as two types of powder paints with different specific gravities.

塗装装置１が第１粉体Ｓ１および第２粉体Ｓ２を吐出する対象物Ｔは、本実施形態では、図１に示されるように、中心軸Ｘｒに沿って延びる内部空間を有する管体であり、具体的には、管体の内面である。管体（対象物）Ｔは、たとえば、上下水道に用いられる鋳鉄管などの金属管である。しかし、対象物Ｔは、金属管の外側壁であってもよく、その他の任意の物体の表面から選択されてもよい。図１では、管体（対象物）Ｔは、中心軸Ｘｒ周りに回転させる回転体Ｒに載置されている。 In this embodiment, the object T onto which the coating device 1 ejects the first powder S1 and the second powder S2 is a pipe having an internal space extending along the central axis Xr, as shown in FIG. 1, and specifically, the inner surface of the pipe. The pipe (object) T is, for example, a metal pipe such as a cast iron pipe used for water supply and sewerage. However, the object T may also be the outer wall of a metal pipe, or may be selected from the surface of any other object. In FIG. 1, the pipe (object) T is placed on a rotating body R that rotates it around the central axis Xr.

塗装装置１は、図２に示されるように、第１粉体Ｓ１を第１供給量で供給する第１供給部１１と、第２粉体Ｓ２を第２供給量で供給する第２供給部１２と、圧縮気体Ｇの流路１３１を有する搬送部１３と、流路１３１の下流側で搬送部１３に接続され、第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに向けて吐出する吐出部１４（図１参照）とを備えている。塗装装置１はさらに、第１供給部１１および第２供給部１２と搬送部１３との間に、第１供給部１１および第２供給部１２から搬送部１３に第１粉体Ｓ１および第２粉体Ｓ２を落とし込む投入部１５を備えていてもよい。塗装装置１は、本実施形態では、図１に示されるように、移動可能な台車Ｃ（キャリア）を備えており、塗装装置１の少なくとも一部は、台車Ｃに搭載されることで、台車Ｃとともに移動可能（具体的には、水平方向に移動可能）となっている。台車Ｃは、たとえば、塗装装置１の構成機器のうち、第１供給部１１の一部（具体的には、後述する第１供給器１１２）と、第２供給部１２の一部（具体的には、後述する第２供給器１２２）と、搬送部１３と、投入部１５とを搭載している。 2, the coating device 1 includes a first supply unit 11 that supplies the first powder S1 at a first supply amount, a second supply unit 12 that supplies the second powder S2 at a second supply amount, a conveying unit 13 having a flow path 131 for compressed gas G, and a discharge unit 14 (see FIG. 1) that is connected to the conveying unit 13 downstream of the flow path 131 and discharges the first powder S1 and the second powder S2 toward the target object T. The coating device 1 may further include an input unit 15 between the first supply unit 11 and the second supply unit 12 and the conveying unit 13, which drops the first powder S1 and the second powder S2 from the first supply unit 11 and the second supply unit 12 to the conveying unit 13. In this embodiment, as shown in FIG. 1, the coating device 1 is equipped with a movable cart C (carrier), and at least a part of the coating device 1 is mounted on the cart C, so that it can move together with the cart C (specifically, it can move horizontally). The cart C is equipped with, for example, part of the first supply unit 11 (specifically, the first supply device 112 described later), part of the second supply unit 12 (specifically, the second supply device 122 described later), the transport unit 13, and the input unit 15, which are among the components of the coating device 1.

第１供給部１１は、図２に示されるように、第１粉体Ｓ１を搬送部１３に所望の供給量（第１供給量）で供給する。本実施形態では、第１供給部１１は、第１粉体Ｓ１を貯留し、貯留された第１粉体Ｓ１を搬送部１３に向けて第１供給量で第１供給口１１ａから供給する。 As shown in FIG. 2, the first supply unit 11 supplies the first powder S1 to the conveying unit 13 at a desired supply amount (first supply amount). In this embodiment, the first supply unit 11 stores the first powder S1 and supplies the stored first powder S1 from the first supply port 11a toward the conveying unit 13 at the first supply amount.

第１供給部１１の形態は、第１粉体Ｓ１を搬送部１３に所定の供給量で供給することができれば、特に限定されない。本実施形態では、第１供給部１１は、第１粉体Ｓ１を貯留する第１タンク１１１と、第１タンク１１１から供給される第１粉体Ｓ１を第１供給量で第１供給口１１ａから搬送部１３に落とし込む（本実施形態では、投入部１５を介して搬送部１３に落とし込む）第１供給器１１２とを備えている。第１供給器１１２として、回転軸Ｘ１（以下、「第１回転軸Ｘ１」と呼ぶ）に沿って延びるスクリューを内部空間に有し、第１回転軸Ｘ１周りでスクリューが回転することで、第１供給口１１ａが設けられる第１回転軸Ｘ１の一方側に第１粉体Ｓ１を供給するスクリューフィーダを採用することができる。この場合、スクリューフィーダのスクリューの回転数を一定にすることで、搬送部１３への第１粉体Ｓ１の供給量を維持することができ、かつ、スクリューフィーダのスクリューの回転数を変更することで、第１粉体Ｓ１の供給量を調整することができる。 The form of the first supply unit 11 is not particularly limited as long as it can supply the first powder S1 to the conveying unit 13 at a predetermined supply amount. In this embodiment, the first supply unit 11 includes a first tank 111 that stores the first powder S1, and a first supply device 112 that drops the first powder S1 supplied from the first tank 111 from the first supply port 11a to the conveying unit 13 at a first supply amount (in this embodiment, it drops into the conveying unit 13 via the input unit 15). As the first supply device 112, a screw feeder can be adopted that has a screw extending along the rotation axis X1 (hereinafter referred to as the "first rotation axis X1") in an internal space and supplies the first powder S1 to one side of the first rotation axis X1 on which the first supply port 11a is provided by rotating the screw around the first rotation axis X1. In this case, the supply amount of the first powder S1 to the conveying section 13 can be maintained by keeping the rotation speed of the screw of the screw feeder constant, and the supply amount of the first powder S1 can be adjusted by changing the rotation speed of the screw of the screw feeder.

第２供給部１２は、図２に示されるように、第２粉体Ｓ２を搬送部１３に所望の供給量（第２供給量）で供給する。本実施形態では、第２供給部１２は、第２粉体Ｓ２を貯留し、貯留された第２粉体Ｓ２を搬送部１３に向けて第２供給量で第２供給口１２ａから供給する。 As shown in FIG. 2, the second supply unit 12 supplies the second powder S2 to the conveying unit 13 at a desired supply amount (second supply amount). In this embodiment, the second supply unit 12 stores the second powder S2 and supplies the stored second powder S2 from the second supply port 12a toward the conveying unit 13 at the second supply amount.

第２供給部１２の形態は、第２粉体Ｓ２を搬送部１３に所定の供給量で供給することができれば、特に限定されない。本実施形態では、第２供給部１２は、第２粉体Ｓ２を貯留する第２タンク１２１と、第２タンク１２１から供給される第２粉体Ｓ２を第２供給量で第２供給口１２ａから搬送部１３に落とし込む（本実施形態では、投入部１５を介して搬送部１３に落とし込む）第２供給器１２２とを備えている。第２供給器１２２として、回転軸Ｘ２（以下、「第２回転軸Ｘ２」と呼ぶ）に沿って延びるスクリューを内部空間に有し、第２回転軸Ｘ２周りでスクリューが回転することで、第２供給口１２ａが設けられる第２回転軸Ｘ２の一方側に第２粉体Ｓ２を供給するスクリューフィーダを採用することができる。この場合、スクリューフィーダのスクリューの回転数を一定にすることで、搬送部１３への第２粉体Ｓ２の供給量を維持することができ、かつ、スクリューフィーダのスクリューの回転数を変更することで、第２粉体Ｓ２の供給量を調整することができる。 The form of the second supply unit 12 is not particularly limited as long as it can supply the second powder S2 to the conveying unit 13 at a predetermined supply amount. In this embodiment, the second supply unit 12 includes a second tank 121 that stores the second powder S2, and a second supply device 122 that drops the second powder S2 supplied from the second tank 121 from the second supply port 12a to the conveying unit 13 at the second supply amount (in this embodiment, it drops into the conveying unit 13 via the input unit 15). As the second supply device 122, a screw feeder can be adopted that has a screw extending along the rotation axis X2 (hereinafter referred to as the "second rotation axis X2") in an internal space and supplies the second powder S2 to one side of the second rotation axis X2 on which the second supply port 12a is provided by rotating the screw around the second rotation axis X2. In this case, the supply amount of the second powder S2 to the conveying section 13 can be maintained by keeping the rotation speed of the screw of the screw feeder constant, and the supply amount of the second powder S2 can be adjusted by changing the rotation speed of the screw of the screw feeder.

第１供給部１１および第２供給部１２は、本実施形態では、図２に示されるように、搬送部１３に対して鉛直上方Ｄ１２に配置されており、さらに言えば、投入部１５に対して鉛直上方Ｄ１２に配置されている。具体的には、第１供給部１１および第２供給部１２は、投入部１５が第１供給部１１および第２供給部１２からそれぞれ落し込まれる第１粉体Ｓ１および第２粉体Ｓ２を受容可能であるように、鉛直方向Ｄ１において、第１供給口１１ａおよび第２供給口１２ａが投入部１５の投入口１５ａと重なるように配置されている。図２では、第１供給部１１および第２供給部１２は、流路１３１が延びる方向Ｄ２（具体的には、水平方向の一方向）で互いに対向して配置されている。具体的には、第１供給部１１および第２供給部１２は、第１供給部１１の長手方向（図２では、第１供給器１１２の第１回転軸Ｘ１に沿う方向）および第２供給部１２の長手方向（図２では、第２供給器１２２の第２回転軸Ｘ２に沿う方向）が、流路１３１が延びる方向Ｄ２（具体的には、水平方向の一方向）に沿うように、互いに対向して配置されている。そうした場合、第１供給器１１２および第２供給器１２２の長手方向が、流路１３１が延びる方向Ｄ２と揃うので、塗装装置１を全体として小型化することができる。しかし、第１供給部１１および第２供給部１２の配置は、第１粉体Ｓ１および第２粉体Ｓ２を搬送部１３に落とし込むことができれば、特に限定されない。たとえば、第１供給部１１および第２供給部１２は、第１供給部１１の長手方向および第２供給部１２の長手方向が、流路１３１が延びる方向Ｄ２に沿うように、流路１３１が延びる方向Ｄ２に垂直な方向で並ぶ（図２における紙面の上下方向または紙面手前方向に並ぶ）ように配置されてもよい。そうした場合にも、第１供給器１１２および第２供給器１２２の長手方向が、流路１３１が延びる方向Ｄ２と揃うので、塗装装置１を全体として小型化することができる。また、第１供給部１１および第２供給部１２は、第１供給部１１の長手方向および第２供給部１２の長手方向が、流路１３１が延びる方向Ｄ２と交差するように配置されてもよい。また、第１供給部１１および第２供給部１２は、第１供給部１１の長手方向および第２供給部１２の長手方向が交差するように配置されてもよい。 In this embodiment, as shown in FIG. 2, the first supply unit 11 and the second supply unit 12 are arranged vertically above the conveying unit 13, and more specifically, are arranged vertically above the input unit 15. Specifically, the first supply unit 11 and the second supply unit 12 are arranged such that the first supply port 11a and the second supply port 12a overlap with the input port 15a of the input unit 15 in the vertical direction D1 so that the input unit 15 can receive the first powder S1 and the second powder S2 dropped from the first supply unit 11 and the second supply unit 12, respectively. In FIG. 2, the first supply unit 11 and the second supply unit 12 are arranged opposite each other in the direction D2 in which the flow path 131 extends (specifically, one horizontal direction). Specifically, the first supply unit 11 and the second supply unit 12 are arranged opposite to each other so that the longitudinal direction of the first supply unit 11 (in FIG. 2, the direction along the first rotation axis X1 of the first supply unit 112) and the longitudinal direction of the second supply unit 12 (in FIG. 2, the direction along the second rotation axis X2 of the second supply unit 122) are along the direction D2 in which the flow path 131 extends (specifically, one horizontal direction). In this case, the longitudinal direction of the first supply unit 112 and the second supply unit 122 is aligned with the direction D2 in which the flow path 131 extends, so that the coating device 1 can be made smaller as a whole. However, the arrangement of the first supply unit 11 and the second supply unit 12 is not particularly limited as long as the first powder S1 and the second powder S2 can be dropped into the conveying unit 13. For example, the first supply unit 11 and the second supply unit 12 may be arranged so that the longitudinal direction of the first supply unit 11 and the longitudinal direction of the second supply unit 12 are aligned along the direction D2 in which the flow path 131 extends, and are aligned in a direction perpendicular to the direction D2 in which the flow path 131 extends (aligned in the up-down direction or toward the front of the paper in FIG. 2). Even in such a case, the longitudinal directions of the first supply unit 112 and the second supply unit 122 are aligned with the direction D2 in which the flow path 131 extends, so that the coating device 1 can be made smaller as a whole. In addition, the first supply unit 11 and the second supply unit 12 may be arranged so that the longitudinal direction of the first supply unit 11 and the longitudinal direction of the second supply unit 12 intersect with the direction D2 in which the flow path 131 extends. In addition, the first supply unit 11 and the second supply unit 12 may be arranged so that the longitudinal direction of the first supply unit 11 and the longitudinal direction of the second supply unit 12 intersect.

搬送部１３は、圧縮気体Ｇによって第１粉体Ｓ１および第２粉体Ｓ２を吐出部１４に搬送する。搬送部１３は、第１供給部１１および第２供給部１２に対して鉛直下方Ｄ１１側に位置している。第１供給部１１および第２供給部１２に対して鉛直下方Ｄ１１側に位置することで、重力によって、第１供給部１１および第２供給部１２から第１粉体Ｓ１および第２粉体Ｓ２が搬送部１３にそれぞれ落とし込まれる。搬送部１３は、圧縮気体Ｇの流路１３１を有し、鉛直上方Ｄ１２側に、流路１３１と連通し、第１供給部１１および第２供給部１２から第１粉体Ｓ１および第２粉体Ｓ２が流路１３１に落し込まれる、第１粉体Ｓ１および第２粉体Ｓ２で共通する搬入口１３ａを有している。本実施形態では、搬入口１３ａは、流路１３１と鉛直上方Ｄ１２で連通する単一の開口である。しかし、搬入口１３ａの配置や数は、第１粉体Ｓ１および第２粉体Ｓ２の両方を流路１３１に落とし込むことができれば、特に限定されない。 The conveying section 13 conveys the first powder S1 and the second powder S2 to the discharge section 14 by compressed gas G. The conveying section 13 is located on the vertically downward D11 side with respect to the first supply section 11 and the second supply section 12. By being located on the vertically downward D11 side with respect to the first supply section 11 and the second supply section 12, the first powder S1 and the second powder S2 are dropped into the conveying section 13 from the first supply section 11 and the second supply section 12 by gravity. The conveying section 13 has a flow path 131 for the compressed gas G, and has an inlet 13a on the vertically upward D12 side that is connected to the flow path 131 and is common to the first powder S1 and the second powder S2, through which the first powder S1 and the second powder S2 are dropped into the flow path 131 from the first supply section 11 and the second supply section 12. In this embodiment, the inlet 13a is a single opening that communicates with the flow path 131 vertically upward D12. However, the arrangement and number of the inlets 13a are not particularly limited as long as both the first powder S1 and the second powder S2 can be dropped into the flow path 131.

搬送部１３は、搬入口１３ａから流路１３１にそれぞれ落し込まれる第１粉体Ｓ１および第２粉体Ｓ２を圧縮気体Ｇによって流路１３１の下流側に搬送する。流路１３１が延びる方向Ｄ２（換言すれば、流路１３１の搬送方向Ｄ２１）は、塗装装置１の使用態様などに応じて適宜変更することが可能であるが、本実施形態では、水平方向の一方向である。流路１３１の形状は、圧縮気体Ｇによって第１粉体Ｓ１および第２粉体Ｓ２を搬送可能であれば、特に限定されない。本実施形態では、流路１３１は、円筒形状を有する搬送部１３の内部空間によって構成されている。しかし、流路１３１は、流路１３１に垂直な断面が四角形などの多角形である角筒形状を有する搬送部１３の内部空間によって構成されてもよく、流路１３１の搬送方向Ｄ２１に向かって狭まってもよく、流路１３１の搬送方向Ｄ２１に向かって広がってもよい。たとえば、流路１３１の一端は、公知のコンプレッサなどの圧縮気体供給源（図示せず）と配管１ｂで接続され、流路１３１の他端は、吐出部１４と配管１ａで接続されている。 The conveying section 13 conveys the first powder S1 and the second powder S2, which are respectively dropped into the flow path 131 from the inlet 13a, to the downstream side of the flow path 131 by the compressed gas G. The direction D2 in which the flow path 131 extends (in other words, the conveying direction D21 of the flow path 131) can be changed as appropriate depending on the usage mode of the coating device 1, but in this embodiment, it is a horizontal direction. The shape of the flow path 131 is not particularly limited as long as the first powder S1 and the second powder S2 can be conveyed by the compressed gas G. In this embodiment, the flow path 131 is constituted by the internal space of the conveying section 13 having a cylindrical shape. However, the flow path 131 may be constituted by the internal space of the conveying section 13 having a square cylindrical shape in which the cross section perpendicular to the flow path 131 is a polygon such as a square, and may be narrowed toward the conveying direction D21 of the flow path 131, or may be widened toward the conveying direction D21 of the flow path 131. For example, one end of the flow path 131 is connected to a compressed gas supply source (not shown) such as a known compressor via a pipe 1b, and the other end of the flow path 131 is connected to the discharge portion 14 via a pipe 1a.

吐出部１４は、図１に示されるように、搬送部１３（図２参照）から圧縮気体Ｇによって搬送される第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに向けて吐出する。具体的には、吐出部１４は、所定の方向に第１粉体Ｓ１および第２粉体Ｓ２を突出する吐出ノズルによって構成されている。本実施形態では、吐出部１４は、配管１ａによって搬送方向Ｄ２１側で搬送部１３の流路１３１と接続されており、搬送部１３から搬送される第１粉体Ｓ１および第２粉体Ｓ２を圧縮気体Ｇによって対象物Ｔに向けて吐出する。吐出部１４は、第１供給部１１による第１供給量および第２供給部１２による第２供給量に応じた所定の割合で、第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに向けて吐出する。吐出部１４による第１粉体Ｓ１および第２粉体Ｓ２の吐出方向は、塗装装置１の使用態様などに応じて適宜変更することが可能である。本実施形態では、吐出部１４は、流路１３１の搬送方向Ｄ２１と交差する方向（より具体的には、管体（対象物）Ｔの中心軸Ｘｒに垂直な方向（管体（対象物）Ｔの径方向））で、対象物Ｔである管体の内面に向けて第１粉体Ｓ１および第２粉体Ｓ２を吐出する。この場合、第１粉体Ｓ１および第２粉体Ｓ２の吐出方向が、流路１３１の搬送方向Ｄ２１と異なるため、圧縮気体Ｇの圧力損失が大きい。そのような場合であっても、本実施形態では、流路１３１の搬送方向Ｄ２１への第１粉体Ｓ１および第２粉体Ｓ２の運動成分を増加させることで、第１粉体Ｓ１および第２粉体Ｓ２が圧縮気体Ｇに乗りやすくなるので、第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに良好に吹き付けることができる。 As shown in FIG. 1, the discharge unit 14 discharges the first powder S1 and the second powder S2 conveyed by the compressed gas G from the conveying unit 13 (see FIG. 2) toward the target T. Specifically, the discharge unit 14 is configured by a discharge nozzle that projects the first powder S1 and the second powder S2 in a predetermined direction. In this embodiment, the discharge unit 14 is connected to the flow path 131 of the conveying unit 13 on the conveying direction D21 side by the piping 1a, and discharges the first powder S1 and the second powder S2 conveyed from the conveying unit 13 toward the target T by the compressed gas G. The discharge unit 14 discharges the first powder S1 and the second powder S2 toward the target T at a predetermined ratio according to the first supply amount by the first supply unit 11 and the second supply amount by the second supply unit 12. The discharge direction of the first powder S1 and the second powder S2 by the discharge unit 14 can be appropriately changed depending on the usage mode of the coating device 1. In this embodiment, the discharge unit 14 discharges the first powder S1 and the second powder S2 toward the inner surface of the tube, which is the target T, in a direction intersecting the conveying direction D21 of the flow path 131 (more specifically, in a direction perpendicular to the central axis Xr of the tube (target) T (diameter direction of the tube (target) T)). In this case, since the discharge direction of the first powder S1 and the second powder S2 is different from the conveying direction D21 of the flow path 131, the pressure loss of the compressed gas G is large. Even in such a case, in this embodiment, by increasing the motion component of the first powder S1 and the second powder S2 in the conveying direction D21 of the flow path 131, the first powder S1 and the second powder S2 are more likely to ride on the compressed gas G, so that the first powder S1 and the second powder S2 can be sprayed well onto the target T.

吐出部１４は、本実施形態では、図１に示されるように、管体（対象物）Ｔの内部空間に挿入されている。図１では、管体（対象物）Ｔを回転体Ｒによって中心軸Ｘｒ周りに回転させながら、台車Ｃを中心軸Ｘｒに沿って移動させるとともに、吐出部１４が、管体（対象物）Ｔの中心軸Ｘｒに垂直な方向（管体の径方向）に向けて第１粉体Ｓ１および第２粉体Ｓ２を吐出している。そうすることで、管体（対象物）Ｔの内面全体を塗装することができる。 In this embodiment, the discharge unit 14 is inserted into the internal space of the tube (object) T as shown in Figure 1. In Figure 1, the tube (object) T is rotated around the central axis Xr by the rotor R while the cart C moves along the central axis Xr, and the discharge unit 14 discharges the first powder S1 and the second powder S2 in a direction perpendicular to the central axis Xr of the tube (object) T (diameter of the tube). In this way, the entire inner surface of the tube (object) T can be painted.

投入部１５は、図２に示されるように、第１供給部１１から投入される第１粉体Ｓ１、および第２供給部１２から投入される第２粉体Ｓ２を搬送部１３に誘導する。具体的には、第１供給口１１ａから投入される第１粉体Ｓ１、および第２供給口１２ａから投入される第２粉体Ｓ２を、第１粉体Ｓ１および第２粉体Ｓ２で共通する搬入口１３ａに誘導する。投入部１５の形態は、特に限定されないが、本実施形態では、投入部１５は、第１粉体Ｓ１および第２粉体Ｓ２が投入される投入口１５ａと、第１粉体Ｓ１および第２粉体Ｓ２が排出される排出口１５ｂとを繋ぐ、管状通路１５１を有している。 As shown in FIG. 2, the input section 15 guides the first powder S1 input from the first supply section 11 and the second powder S2 input from the second supply section 12 to the transport section 13. Specifically, the input section 15 guides the first powder S1 input from the first supply port 11a and the second powder S2 input from the second supply port 12a to the inlet 13a shared by the first powder S1 and the second powder S2. The form of the input section 15 is not particularly limited, but in this embodiment, the input section 15 has a tubular passage 151 connecting the input port 15a through which the first powder S1 and the second powder S2 are input and the outlet 15b through which the first powder S1 and the second powder S2 are discharged.

管状通路１５１は、本実施形態では、図２に示されるように、第１供給部１１から投入される第１粉体Ｓ１、および第２供給部１２から投入される第２粉体Ｓ２を搬送部１３に誘導するように、第１供給部１１および第２供給部１２と搬送部１３との間に設けられている。ここで、流路１３１には圧縮気体Ｇが流れているので、流路１３１は負圧となり、第１供給部１１および第２供給部１２と管状通路１５１には吸引力が働く。そのため、第１供給部１１の第１供給口１１ａおよび第２供給部１２の第２供給口１２ａと管状通路１５１の投入口１５ａとが連結されていると、第１供給部１１および第２供給部１２内の第１粉体Ｓ１および第２粉体Ｓ２が過剰に吸引されるおそれがある、そこで、図２では、管状通路１５１は、第１供給部１１および第２供給部１２と離間して設けられている。換言すれば、管状通路１５１の投入口１５ａは、第１供給部１１の第１供給口１１ａおよび第２供給部１２の第２供給口１２ａと離間して設けられている。そうすると、管状通路１５１と第１供給部１１および第２供給部１２との間の部分が接続されず大気に開放されているので、負圧である流路１３１への第１供給部１１および第２供給部１２からの第１粉体Ｓ１および第２粉体Ｓ２の過剰な吸引が抑制される。また、この場合、第１粉体Ｓ１および第２粉体Ｓ２とともに空気も吸引されるので、搬送部１３の能力を十分に発揮することができる。図２では、管状通路１５１の投入口１５ａは、鉛直方向Ｄ１から見て、第１供給口１１ａおよび第２供給口１２ａを包含されるように設けられている。この場合、第１供給口１１ａおよび第２供給口１２ａからそれぞれ投下される第１粉体Ｓ１および第２粉体Ｓ２が、投入口１５ａに投入されずに、投入口１５ａから漏れることが抑制される。しかし、管状通路１５１は、第１供給部１１（具体的には、第１供給器１１２）および第２供給部１２（具体的には、第２供給器１２２）と連結されていてもよい。また、図２では、管状通路１５１は、第１粉体Ｓ１および第２粉体Ｓ２が圧縮気体Ｇの流路１３１に確実に落とし込まれるようにするために、搬送部１３の流路１３１と連結されている。換言すれば、管状通路１５１の排出口１５ｂは、搬送部１３の搬入口１３ａと一致するように設けられている。しかし、管状通路１５１は、搬送部１３の流路１３１と離間して設けられていてもよい。この場合、搬入口１３ａからの第１粉体Ｓ１および第２粉体Ｓ２の落とし込みを妨げないように、排出口１５ｂは、たとえば、鉛直方向Ｄ１から見て、搬入口１３ａを包含するように設けられる。 In this embodiment, as shown in Fig. 2, the tubular passage 151 is provided between the first supply unit 11 and the second supply unit 12 and the conveying unit 13 so as to guide the first powder S1 fed from the first supply unit 11 and the second powder S2 fed from the second supply unit 12 to the conveying unit 13. Here, since compressed gas G flows through the flow path 131, the flow path 131 becomes negative pressure, and a suction force acts on the first supply unit 11, the second supply unit 12, and the tubular passage 151. Therefore, if the first supply port 11a of the first supply unit 11 and the second supply port 12a of the second supply unit 12 are connected to the inlet 15a of the tubular passage 151, the first powder S1 and the second powder S2 in the first supply unit 11 and the second supply unit 12 may be excessively sucked in. Therefore, in Fig. 2, the tubular passage 151 is provided away from the first supply unit 11 and the second supply unit 12. In other words, the inlet 15a of the tubular passage 151 is provided away from the first supply port 11a of the first supply unit 11 and the second supply port 12a of the second supply unit 12. In this case, the portions between the tubular passage 151 and the first and second supply parts 11 and 12 are not connected and open to the atmosphere, so that excessive suction of the first powder S1 and the second powder S2 from the first and second supply parts 11 and 12 into the flow path 131, which is under negative pressure, is suppressed. In this case, air is also sucked in together with the first powder S1 and the second powder S2, so that the capacity of the conveying part 13 can be fully demonstrated. In FIG. 2, the inlet 15a of the tubular passage 151 is provided so as to include the first supply port 11a and the second supply port 12a when viewed from the vertical direction D1. In this case, the first powder S1 and the second powder S2 dropped from the first supply port 11a and the second supply port 12a, respectively, are suppressed from leaking from the inlet 15a without being fed into the inlet 15a. However, the tubular passage 151 may be connected to the first supply unit 11 (specifically, the first supply device 112) and the second supply unit 12 (specifically, the second supply device 122). Also, in FIG. 2, the tubular passage 151 is connected to the flow path 131 of the conveying unit 13 so that the first powder S1 and the second powder S2 are reliably dropped into the flow path 131 of the compressed gas G. In other words, the discharge port 15b of the tubular passage 151 is provided so as to coincide with the inlet 13a of the conveying unit 13. However, the tubular passage 151 may be provided apart from the flow path 131 of the conveying unit 13. In this case, the discharge port 15b is provided so as to include the inlet 13a when viewed from the vertical direction D1, for example, so as not to interfere with the dropping of the first powder S1 and the second powder S2 from the inlet 13a.

管状通路１５１は、本実施形態では、図２に示されるように、投入口１５ａと排出口１５ｂとの間に設けられ、投入部１５に落とし込まれる第１粉体Ｓ１および第２粉体Ｓ２が当接する当接部１５ｃを有している。具体的には、当接部１５ｃは、流路１３１の搬送方向Ｄ２１の反対側に位置する管状通路１５１の内面によって構成されている。本実施形態では、管状通路１５１は、投入口１５ａから投入される第１粉体Ｓ１および第２粉体Ｓ２が、当接部１５ｃに当接することで、少なくとも搬送方向Ｄ２１への運動成分を増加させるように第１粉体Ｓ１および第２粉体Ｓ２の運動方向を変化させた後に、排出口１５ｂから排出されることで、流路１３１に落とし込まれるように構成されている。そうした場合、第１粉体Ｓ１および第２粉体Ｓ２の運動成分が、流路１３１に落とし込まれる前に、流路１３１を流れる圧縮気体Ｇと同じ搬送方向Ｄ２１で増加するので、第１粉体Ｓ１および第２粉体Ｓ２が、圧縮気体Ｇに乗りやすくなる。これにより、第１粉体Ｓ１および第２粉体Ｓ２が、流路１３１内で重力により鉛直下方Ｄ１１に溜まることが抑制されるので、第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに良好に吹き付けることできる。図２では、第１粉体Ｓ１および第２粉体Ｓ２が投下される鉛直下方Ｄ１１に対して、管状通路１５１の内面に対する法線Ｎ１、Ｎ２が鋭角α１、α２をなすように、当接部１５ｃが設けられている。そうすることで、管状通路１５１を用いて当接部１５ｃを容易に形成することができる。 In this embodiment, as shown in FIG. 2, the tubular passage 151 is provided between the inlet 15a and the outlet 15b, and has an abutment portion 15c against which the first powder S1 and the second powder S2 dropped into the inlet 15 abut. Specifically, the abutment portion 15c is formed by the inner surface of the tubular passage 151 located on the opposite side of the conveying direction D21 of the flow path 131. In this embodiment, the tubular passage 151 is configured so that the first powder S1 and the second powder S2 input from the inlet 15a abut against the abutment portion 15c, thereby changing the direction of motion of the first powder S1 and the second powder S2 so as to increase at least the motion component in the conveying direction D21, and then being discharged from the outlet 15b, so as to be dropped into the flow path 131. In this case, the motion components of the first powder S1 and the second powder S2 increase in the same conveying direction D21 as the compressed gas G flowing through the flow path 131 before being dropped into the flow path 131, so that the first powder S1 and the second powder S2 are more likely to ride on the compressed gas G. This prevents the first powder S1 and the second powder S2 from accumulating vertically downward D11 in the flow path 131 due to gravity, so that the first powder S1 and the second powder S2 can be sprayed well onto the target T. In FIG. 2, the abutment portion 15c is provided so that the normals N1 and N2 to the inner surface of the tubular passage 151 form acute angles α1 and α2 with respect to the vertically downward D11 where the first powder S1 and the second powder S2 are dropped. In this way, the abutment portion 15c can be easily formed using the tubular passage 151.

管状通路１５１の形状は、第１粉体Ｓ１および第２粉体Ｓ２を搬送部１３に誘導可能であれば、特に限定されない。本実施形態では、図２に示されるように、管状通路１５１は、投入口１５ａと排出口１５ｂとの間で屈曲している。管状通路１５１を屈曲させることで、管状通路１５１の内面に当接した第１粉体Ｓ１および第２粉体Ｓ２が、鉛直上方Ｄ１２側に跳ね返りにくくなるので、第１粉体Ｓ１および第２粉体Ｓ２の管状通路１５１への投入効率が向上する。管状通路１５１は、具体的には、排出口１５ｂが投入口１５ａに対して流路１３１の搬送方向Ｄ２１の下流側に位置するように屈曲している。図２では、管状通路１５１は、排出口１５ｂ側の中心軸Ｙ１と流路１３１の搬送方向Ｄ２１とのなす角度β１が投入口１５ａ側の中心軸Ｙ２と流路１３１の搬送方向Ｄ２１とのなす角度β２より小さくなるように屈曲し、当接部１５ｃは、流路１３１の搬送方向Ｄ２１の反対側に位置する管状通路１５１の排出口１５ｂ側の内面によって構成されている。そうした場合、流路１３１の搬送方向Ｄ２１との角度β１が小さくなった排出口１５ｂ側の管状通路１５１と搬送部１３の流路１３１とが接続されることで、管状通路１５１と流路１３１との合流部付近での気体の乱流が生じにくくなる。管状通路１５１の排出口１５ｂ側の中心軸Ｙ１と流路１３１の搬送方向Ｄ２１とのなす角度β１は、好ましくは、３０度～６０度の範囲内、より好ましくは、３５度～５５度の範囲内、さらに好ましくは、４０度～５０度の範囲内に設定することができる。管状通路１５１の投入口１５ａ側の中心軸Ｙ２と流路１３１の搬送方向Ｄ２１とのなす角度β２は、好ましくは、６０度～９０度の範囲内、より好ましくは、７０度～９０度の範囲内、さらに好ましくは、８０度～９０度の範囲内に設定することができる。しかし、管状通路１５１は、直管形状を有していてもよく、この場合、鉛直方向Ｄ１に延びる直管であってもよく、鉛直方向Ｄ１と交差する方向に延びる直管であってもよい。 The shape of the tubular passage 151 is not particularly limited as long as it can guide the first powder S1 and the second powder S2 to the conveying section 13. In this embodiment, as shown in FIG. 2, the tubular passage 151 is bent between the inlet 15a and the outlet 15b. By bending the tubular passage 151, the first powder S1 and the second powder S2 that come into contact with the inner surface of the tubular passage 151 are less likely to bounce vertically upward D12, improving the efficiency of feeding the first powder S1 and the second powder S2 into the tubular passage 151. Specifically, the tubular passage 151 is bent so that the outlet 15b is located downstream of the inlet 15a in the conveying direction D21 of the flow path 131. 2, the tubular passage 151 is bent so that the angle β1 between the central axis Y1 on the discharge port 15b side and the conveying direction D21 of the flow path 131 is smaller than the angle β2 between the central axis Y2 on the inlet 15a side and the conveying direction D21 of the flow path 131, and the abutting portion 15c is formed by the inner surface on the discharge port 15b side of the tubular passage 151 located on the opposite side of the conveying direction D21 of the flow path 131. In such a case, the tubular passage 151 on the discharge port 15b side, in which the angle β1 with the conveying direction D21 of the flow path 131 is reduced, is connected to the flow path 131 of the conveying unit 13, so that turbulence of gas is less likely to occur near the confluence of the tubular passage 151 and the flow path 131. The angle β1 between the central axis Y1 of the tubular passage 151 on the discharge port 15b side and the conveying direction D21 of the flow path 131 can be set preferably within the range of 30 degrees to 60 degrees, more preferably within the range of 35 degrees to 55 degrees, and even more preferably within the range of 40 degrees to 50 degrees. The angle β2 between the central axis Y2 of the tubular passage 151 on the input port 15a side and the conveying direction D21 of the flow path 131 can be set preferably within the range of 60 degrees to 90 degrees, more preferably within the range of 70 degrees to 90 degrees, and even more preferably within the range of 80 degrees to 90 degrees. However, the tubular passage 151 may have a straight pipe shape, and in this case, it may be a straight pipe extending in the vertical direction D1, or may be a straight pipe extending in a direction intersecting the vertical direction D1.

なお、図２では、当接部１５ｃは、鉛直下方Ｄ１１に向かって、流路１３１の搬送方向Ｄ２１に対して一定の角度β１で傾斜する傾斜面によって構成されている。この場合、第１粉体Ｓ１が当接する当接部１５ｃに対する法線と、鉛直下方Ｄ１１とのなす角α１は、第２粉体Ｓ２が当接する当接部１５ｃに対する法線と、鉛直下方Ｄ１１とのなす角α２と略同じとなる。しかし、当接部１５ｃは、鉛直下方Ｄ１１に向かって、流路１３１の搬送方向Ｄ２１に対する角度β１を変えながら傾斜する湾曲面によって構成されていてもよい。この場合、第１粉体Ｓ１が当接する当接部１５ｃに対する法線と、鉛直下方Ｄ１１とのなす角α１は、第２粉体Ｓ２が当接する当接部１５ｃに対する法線と、鉛直下方Ｄ１１とのなす角α２と異なる。 2, the contact portion 15c is configured by an inclined surface that is inclined at a constant angle β1 with respect to the conveying direction D21 of the flow path 131 toward the vertical downward direction D11. In this case, the angle α1 between the normal to the contact portion 15c with which the first powder S1 contacts and the vertical downward direction D11 is approximately the same as the angle α2 between the normal to the contact portion 15c with which the second powder S2 contacts and the vertical downward direction D11. However, the contact portion 15c may be configured by a curved surface that is inclined toward the vertical downward direction D11 while changing the angle β1 with respect to the conveying direction D21 of the flow path 131. In this case, the angle α1 between the normal to the contact portion 15c with which the first powder S1 contacts and the vertical downward direction D11 is different from the angle α2 between the normal to the contact portion 15c with which the second powder S2 contacts and the vertical downward direction D11.

排出口１５ｂは、本実施形態では、鉛直方向Ｄ１から見て、投入口１５ａと重ならないように設けられている。そうした場合、投入口１５ａから投入される第１粉体Ｓ１および第２粉体Ｓ２が、当接部１５ｃに当接せず、搬送方向Ｄ２１への運動成分を増加させないまま、排出口１５ｂから排出されることが抑制される。 In this embodiment, the discharge port 15b is arranged so as not to overlap with the inlet 15a when viewed from the vertical direction D1. In this case, the first powder S1 and the second powder S2 fed from the inlet 15a are prevented from coming into contact with the contact portion 15c and being discharged from the discharge port 15b without increasing the motion component in the conveying direction D21.

［本発明の一実施形態に係る塗装装置における粉体の挙動］
次に、上述の塗装装置１での第１粉体Ｓ１および第２粉体Ｓ２の挙動を説明する。なお、以下に示す実施形態は、あくまで一例であり、本発明の塗装装置における第１粉体および第２粉体の挙動は、以下の実施形態に限定されるものではない。 [Behavior of powder in a coating device according to one embodiment of the present invention]
Next, a description will be given of the behavior of the first powder S1 and the second powder S2 in the above-mentioned coating apparatus 1. Note that the embodiment described below is merely an example, and the behavior of the first powder and the second powder in the coating apparatus of the present invention is not limited to the embodiment described below.

本実施形態において、図２に示されるように、まず、第１粉体Ｓ１および第２粉体Ｓ２は、第１供給部１１および第２供給部１２にそれぞれ供給される。具体的には、第１粉体Ｓ１および第２粉体Ｓ２はそれぞれ、第１タンク１１１および第２タンク１２１に供給されて貯留されている。本実施形態において、対象物Ｔを塗装する際には（図１参照）、第１粉体Ｓ１および第２粉体Ｓ２は、第１供給部１１および第２供給部１２から第１供給量および第２供給量で搬送部１３にそれぞれ落し込まれ、流路１３１を流れる圧縮気体Ｇによって搬送方向Ｄ２１に搬送される。第１タンク１１１から供給される第１粉体Ｓ１は、具体的には、第１供給器１１２によって第１供給量で第１供給口１１ａから搬送部１３に落とし込まれ、搬入口１３ａから流路１３１に投入されると、流路１３１を流れる圧縮気体Ｇによって搬送方向Ｄ２１に搬送される。第２タンク１２１から供給される第２粉体Ｓ２は、具体的には、第２供給器１２２によって第２供給量で第２供給口１２ａから搬送部１３に落とし込まれ、搬入口１３ａから流路１３１に投入されると、流路１３１を流れる圧縮気体Ｇによって搬送方向Ｄ２１に搬送される。換言すれば、本実施形態では、搬送部１３以降の下流側の配管は、第１粉体Ｓ１および第２粉体Ｓ２で共用されており、第１粉体Ｓ１用の配管および第２粉体Ｓ２用の配管として、別々に設けられなくてもよい。また、本実施形態では、第１粉体Ｓ１および第２粉体Ｓ２は、同一の搬入口１３ａから流路１３１に落とし込まれることで、流路１３１を流れる圧縮気体Ｇによって搬送方向Ｄ２１に搬送される。そうした場合、本発明者は、第１粉体Ｓ１および第２粉体Ｓ２の比重が異なっていても、流路１３１への第１粉体Ｓ１の供給量（第１供給量）および第２粉体Ｓ２の供給量（第２供給量）の割合で、第１粉体Ｓ１および第２粉体Ｓ２が均一に混じり合った状態で、吐出部１４から吐出されることを見出した。 In this embodiment, as shown in FIG. 2, first, the first powder S1 and the second powder S2 are supplied to the first supply unit 11 and the second supply unit 12, respectively. Specifically, the first powder S1 and the second powder S2 are supplied to and stored in the first tank 111 and the second tank 121, respectively. In this embodiment, when painting the object T (see FIG. 1), the first powder S1 and the second powder S2 are dropped into the conveying unit 13 from the first supply unit 11 and the second supply unit 12 in the first supply amount and the second supply amount, respectively, and are conveyed in the conveying direction D21 by the compressed gas G flowing through the flow path 131. Specifically, the first powder S1 supplied from the first tank 111 is dropped into the conveying section 13 from the first supply port 11a by the first supply device 112 at a first supply amount, and when it is input into the flow path 131 from the carry-in port 13a, it is conveyed in the conveying direction D21 by the compressed gas G flowing through the flow path 131. Specifically, the second powder S2 supplied from the second tank 121 is dropped into the conveying section 13 from the second supply port 12a by the second supply device 122 at a second supply amount, and when it is input into the flow path 131 from the carry-in port 13a, it is conveyed in the conveying direction D21 by the compressed gas G flowing through the flow path 131. In other words, in this embodiment, the piping downstream of the conveying section 13 is shared by the first powder S1 and the second powder S2, and it is not necessary to provide separate piping for the first powder S1 and for the second powder S2. In this embodiment, the first powder S1 and the second powder S2 are dropped into the flow path 131 from the same inlet 13a, and are transported in the transport direction D21 by the compressed gas G flowing through the flow path 131. In this case, the inventors have found that even if the specific gravities of the first powder S1 and the second powder S2 are different, the first powder S1 and the second powder S2 are discharged from the discharge unit 14 in a uniformly mixed state at the ratio of the supply amount (first supply amount) of the first powder S1 to the flow path 131 and the supply amount (second supply amount) of the second powder S2.

本実施形態では、図２に示されるように、第１供給部１１および第２供給部１２から搬送部１３への第１粉体Ｓ１および第２粉体Ｓ２の落とし込みの際に、第１粉体Ｓ１および第２粉体Ｓ２は、投入部１５を経由して搬送部１３に落とし込まれる。その際、本実施形態では、第１供給部１１および第２供給部１２（具体的には、第１供給器１１２および第２供給器１２２）と投入部１５（具体的には、管状通路１５１）とが離間して配置されているため、投入部１５と第１供給部１１および第２供給部１２との間の部分が接続されず大気に開放されている。そのため、第１供給部１１および第２供給部１２から負圧状態である流路１３１への第１粉体Ｓ１および第２粉体Ｓ２の過剰な吸引が抑制される。また、この場合、第１粉体Ｓ１および第２粉体Ｓ２とともに空気も吸引されるので、搬送部１３の能力を十分に発揮することができる。これにより、第１粉体Ｓ１および第２粉体Ｓ２の投入部１５（具体的には、管状通路１５１）への投入効率が向上する。 In this embodiment, as shown in FIG. 2, when the first powder S1 and the second powder S2 are dropped from the first supply unit 11 and the second supply unit 12 to the conveying unit 13, the first powder S1 and the second powder S2 are dropped into the conveying unit 13 via the input unit 15. At that time, in this embodiment, the first supply unit 11 and the second supply unit 12 (specifically, the first supply device 112 and the second supply device 122) and the input unit 15 (specifically, the tubular passage 151) are arranged apart from each other, so that the portions between the input unit 15 and the first supply unit 11 and the second supply unit 12 are not connected and are open to the atmosphere. Therefore, excessive suction of the first powder S1 and the second powder S2 from the first supply unit 11 and the second supply unit 12 to the flow path 131, which is in a negative pressure state, is suppressed. In addition, in this case, air is also sucked in together with the first powder S1 and the second powder S2, so that the capacity of the conveying unit 13 can be fully demonstrated. This improves the efficiency of feeding the first powder S1 and the second powder S2 into the feed section 15 (specifically, the tubular passage 151).

本実施形態では、図２に示されるように、第１粉体Ｓ１および第２粉体Ｓ２は、投入口１５ａから管状通路１５１に落とし込まれると、重力によって鉛直下方Ｄ１１に落下し、流路１３１の搬送方向Ｄ２１の反対側に位置する管状通路１５１の内面によって構成される当接部１５ｃに当接する。この第１粉体Ｓ１および第２粉体Ｓ２の当接部１５ｃへの当接により、流路１３１の搬送方向Ｄ２１への第１粉体Ｓ１および第２粉体Ｓ２の運動成分を増加させることができる。その際、本実施形態では、排出口１５ｂが鉛直方向Ｄ１から見て投入口１５ａと重ならないように設けられているので、投入口１５ａから投入される第１粉体Ｓ１および第２粉体Ｓ２が、当接部１５ｃに当接せずに（換言すれば、運動方向を変えずに）、そのまま排出口１５ｂから排出されることが抑制される。 In this embodiment, as shown in FIG. 2, when the first powder S1 and the second powder S2 are dropped into the tubular passage 151 from the inlet 15a, they fall vertically downward D11 due to gravity and come into contact with the abutment portion 15c formed by the inner surface of the tubular passage 151 located on the opposite side of the conveying direction D21 of the flow path 131. The abutment of the first powder S1 and the second powder S2 with the abutment portion 15c can increase the motion component of the first powder S1 and the second powder S2 in the conveying direction D21 of the flow path 131. At that time, in this embodiment, the discharge port 15b is arranged so as not to overlap with the inlet 15a when viewed from the vertical direction D1, so that the first powder S1 and the second powder S2 input from the inlet 15a are prevented from being discharged from the discharge port 15b without coming into contact with the abutment portion 15c (in other words, without changing the direction of movement).

第１粉体Ｓ１および第２粉体Ｓ２のうちの一部は、管状通路１５１の内面への当接により、鉛直上方Ｄ１２側に跳ね返ることもある。しかし、本実施形態では、図２に示されるように、管状通路１５１が屈曲しているので、第１粉体Ｓ１および第２粉体Ｓ２は、管状通路１５１の屈曲する内面によって、跳ね返りの方向が制限され、鉛直上方Ｄ１２側に跳ね返りにくくなる。この場合、たとえば、第１粉体Ｓ１および第２粉体Ｓ２が、管状通路１５１の投入口１５ａと第１供給部１１（具体的には、第１供給器１１２）の第１供給口１１ａおよび第２供給部１２（具体的には、第２供給器１２２）の第２供給口１２ａとの間から離脱したり、第１供給部１１（具体的には、第１供給器１１２）および第２供給部１２（具体的には、第２供給器１２２）に跳ね返って戻ることが抑制されるので、第１粉体Ｓ１および第２粉体Ｓ２の管状通路１５１への投入効率が向上する。 Some of the first powder S1 and the second powder S2 may bounce vertically upward D12 due to contact with the inner surface of the tubular passage 151. However, in this embodiment, as shown in FIG. 2, the tubular passage 151 is curved, so that the direction of the rebound of the first powder S1 and the second powder S2 is limited by the curved inner surface of the tubular passage 151, making it difficult for the first powder S1 and the second powder S2 to bounce vertically upward D12. In this case, for example, the first powder S1 and the second powder S2 are prevented from escaping between the inlet 15a of the tubular passage 151 and the first supply port 11a of the first supply unit 11 (specifically, the first supply device 112) and the second supply port 12a of the second supply unit 12 (specifically, the second supply device 122) or from bouncing back to the first supply unit 11 (specifically, the first supply device 112) and the second supply unit 12 (specifically, the second supply device 122), improving the efficiency of feeding the first powder S1 and the second powder S2 into the tubular passage 151.

本実施形態において、図２に示されるように、第１粉体Ｓ１および第２粉体Ｓ２は、搬送部１３への落とし込みにより、搬入口１３ａから圧縮気体Ｇの流路１３１に投入される。ここで、本実施形態では、管状通路１５１は、管状通路１５１の排出口１５ｂ側の中心軸Ｙ１と流路１３１の搬送方向Ｄ２１とのなす角度β１が管状通路１５１の投入口１５ａ側の中心軸Ｙ２と流路１３１の搬送方向Ｄ２１とのなす角度β２より小さくなるように屈曲している。この場合、流路１３１の搬送方向Ｄ２１との角度β１が小さくなった搬送部１３側の管状通路１５１と流路１３１とが接続されることで、管状通路１５１と流路１３１との合流部において、管状通路１５１からの気体と流路１３１の圧縮気体Ｇとの合流抵抗が小さくなるので、管状通路１５１と流路１３１との合流部において、圧縮気体Ｇの乱流が生じにくくなる。そのため、本実施形態では、管状通路１５１や流路１３１に生じる乱流によって圧縮気体Ｇの流れが乱れることで、第１粉体Ｓ１および第２粉体Ｓ２の流れが乱れて搬送されにくくなることが抑制される。 2, the first powder S1 and the second powder S2 are dropped into the conveying section 13 and fed from the inlet 13a into the flow path 131 of the compressed gas G. Here, in this embodiment, the tubular passage 151 is bent so that the angle β1 between the central axis Y1 on the outlet 15b side of the tubular passage 151 and the conveying direction D21 of the flow path 131 is smaller than the angle β2 between the central axis Y2 on the inlet 15a side of the tubular passage 151 and the conveying direction D21 of the flow path 131. In this case, by connecting the tubular passage 151 on the conveying section 13 side, in which the angle β1 of the passage 131 with the conveying direction D21 is reduced, the merging resistance between the gas from the tubular passage 151 and the compressed gas G of the passage 131 at the junction of the tubular passage 151 and the passage 131 is reduced, so that turbulence of the compressed gas G is less likely to occur at the junction of the tubular passage 151 and the passage 131. Therefore, in this embodiment, the turbulence generated in the tubular passage 151 and the passage 131 disturbs the flow of the compressed gas G, which disturbs the flow of the first powder S1 and the second powder S2, making it difficult to convey them.

本実施形態において、図２に示されるように、第１粉体Ｓ１および第２粉体Ｓ２は、圧縮気体Ｇの流路１３１に落とし込まれる際に、流路１３１を流れる圧縮気体Ｇと同じ搬送方向Ｄ２１への運動成分が増加しているので、圧縮気体Ｇに乗りやすくなる。そのため、本実施形態では、第１粉体Ｓ１および第２粉体Ｓ２は、流路１３１内で鉛直下方Ｄ１１側に溜まることが抑制され、圧縮気体Ｇによって容易に搬送方向Ｄ２１に搬送される。 2, when the first powder S1 and the second powder S2 are dropped into the flow path 131 of the compressed gas G, the component of motion in the same conveying direction D21 as the compressed gas G flowing through the flow path 131 increases, making it easier for them to ride on the compressed gas G. Therefore, in this embodiment, the first powder S1 and the second powder S2 are prevented from accumulating on the vertically downward D11 side within the flow path 131, and are easily conveyed in the conveying direction D21 by the compressed gas G.

本実施形態において、図１（図２も参照）に示されるように、第１粉体Ｓ１および第２粉体Ｓ２は、圧縮気体Ｇによって搬送方向Ｄ２１に搬送された後、配管１ａを通って、吐出部１４から管体（対象物）Ｔの内面に吐出される。本実施形態では、第１粉体Ｓ１および第２粉体Ｓ２は、搬送方向Ｄ２１と交差する方向（より具体的には、管体（対象物）Ｔの中心軸Ｘｒに垂直な方向（管体（対象物）Ｔの径方向））で、管体（対象物）Ｔに向かって吐出されるため、第１粉体Ｓ１および第２粉体Ｓ２を搬送する圧縮気体Ｇは、進行方向が曲げられることで、圧力損失が大きくなる。しかし、本実施形態では、このように圧縮気体Ｇの圧力損失が大きい場合であっても、流路１３１の搬送方向Ｄ２１への第１粉体Ｓ１および第２粉体Ｓ２の運動成分を増加させることで、第１粉体Ｓ１および第２粉体Ｓ２が圧縮気体Ｇに乗せる際の抵抗が小さくなるので、第１粉体Ｓ１および第２粉体Ｓ２を管体（対象物）Ｔに良好に吹き付けることができる。 1 (also see FIG. 2), the first powder S1 and the second powder S2 are transported in the transport direction D21 by the compressed gas G, and then discharged from the discharge section 14 through the pipe 1a onto the inner surface of the tube (object) T. In this embodiment, the first powder S1 and the second powder S2 are discharged toward the tube (object) T in a direction intersecting the transport direction D21 (more specifically, in a direction perpendicular to the central axis Xr of the tube (object) T (the radial direction of the tube (object) T)). Therefore, the compressed gas G transporting the first powder S1 and the second powder S2 has its traveling direction bent, resulting in a large pressure loss. However, in this embodiment, even if the pressure loss of the compressed gas G is large, the movement component of the first powder S1 and the second powder S2 in the conveying direction D21 of the flow path 131 is increased, so that the resistance of the first powder S1 and the second powder S2 when they are placed on the compressed gas G is reduced, and the first powder S1 and the second powder S2 can be sprayed well onto the tube (target object) T.

以上のように構成される本実施形態に係る塗装装置１によれば、搬送部１３は、鉛直上方Ｄ１２側に、流路１３１と連通し、第１供給部１１および第２供給部１２から第１粉体Ｓ１および第２粉体Ｓ２が流路１３１に落し込まれる、第１粉体Ｓ１および第２粉体Ｓ２で共通する搬入口１３ａを有している。搬送部１３は、搬入口１３ａから流路１３１にそれぞれ落し込まれる第１粉体Ｓ１および第２粉体Ｓ２を圧縮気体Ｇによって流路１３１の下流側に搬送し、吐出部１４は、第１供給量および第２供給量に応じた所定の割合で、搬送部１３から圧縮気体Ｇによって搬送される第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに向けて吐出する。換言すれば、本実施形態に係る塗装装置１では、少なくとも搬送部１３以降の下流側の配管は、第１粉体Ｓ１および第２粉体Ｓ２で共用されており、第１粉体Ｓ１用の配管および第２粉体Ｓ２用の配管として、別々に設けられなくてもよい。そのため、本実施形態に係る塗装装置１では、第１粉体Ｓ１および第２粉体Ｓ２を供給・吐出する配管が冗長にならないように、簡単な経路で設けることができる。 According to the coating device 1 according to the present embodiment configured as described above, the conveying unit 13 has an inlet 13a on the vertically upward D12 side, which is connected to the flow path 131 and through which the first powder S1 and the second powder S2 are dropped from the first supply unit 11 and the second supply unit 12 into the flow path 131, and which is common to the first powder S1 and the second powder S2. The conveying unit 13 conveys the first powder S1 and the second powder S2, which are respectively dropped into the flow path 131 from the inlet 13a, to the downstream side of the flow path 131 by compressed gas G, and the discharge unit 14 discharges the first powder S1 and the second powder S2 conveyed by the compressed gas G from the conveying unit 13 toward the target T at a predetermined ratio according to the first supply amount and the second supply amount. In other words, in the coating device 1 according to this embodiment, at least the piping downstream of the conveying section 13 is shared by the first powder S1 and the second powder S2, and it is not necessary to provide separate piping for the first powder S1 and piping for the second powder S2. Therefore, in the coating device 1 according to this embodiment, the piping for supplying and discharging the first powder S1 and the second powder S2 can be provided in a simple route so as not to be redundant.

また、本実施形態に係る塗装装置１によれば、第１粉体Ｓ１および第２粉体Ｓ２は、同一の搬入口１３ａから流路１３１に投入されることで、流路１３１を流れる圧縮気体Ｇによって搬送方向Ｄ２１に搬送される。そうした場合、本発明者は、第１粉体Ｓ１および第２粉体Ｓ２の比重が異なっていても、流路１３１に落とし込まれる第１粉体Ｓ１の供給量（第１供給量）および第２粉体Ｓ２の供給量（第２供給量）の割合で、第１粉体Ｓ１および第２粉体Ｓ２が均一に混じり合った状態で、吐出部１４から良好に吐出されることを見出した。 In addition, according to the coating device 1 of this embodiment, the first powder S1 and the second powder S2 are fed into the flow path 131 from the same inlet 13a, and are transported in the transport direction D21 by the compressed gas G flowing through the flow path 131. In this case, the inventor has found that even if the specific gravities of the first powder S1 and the second powder S2 are different, the first powder S1 and the second powder S2 are uniformly mixed and can be well discharged from the discharge section 14 at the ratio of the supply amount (first supply amount) of the first powder S1 and the supply amount (second supply amount) of the second powder S2 dropped into the flow path 131.

なお、本発明者は、本実施形態に係る塗装装置１の代替手段として、図３に示される塗装装置２を検討した。図３は、参考例に係る塗装装置２を示している。参考例に係る塗装装置２は、図３に示されるように、第１粉体Ｓ１および第２粉体Ｓ２を混合するための混合タンク２１と、混合タンク２１から供給される第１粉体Ｓ１および第２粉体Ｓ２を圧縮気体Ｇによって搬送するための圧送器２２とを備えている。混合タンク２１は、鉛直下方Ｄ１１の気体室２１ａと、鉛直上方Ｄ１２の撹拌室２１ｂとに内部空間を分離する分離体２１ｃを備えている。分離体２１ｃは、多孔質材料から構成され、第１粉体Ｓ１および第２粉体Ｓ２を透過させずに、気体を透過させるように構成されている。 The inventor has considered a coating device 2 shown in FIG. 3 as an alternative to the coating device 1 according to this embodiment. FIG. 3 shows a coating device 2 according to a reference example. As shown in FIG. 3, the coating device 2 according to the reference example includes a mixing tank 21 for mixing the first powder S1 and the second powder S2, and a pressure feeder 22 for conveying the first powder S1 and the second powder S2 supplied from the mixing tank 21 by compressed gas G. The mixing tank 21 includes a separator 21c that separates the internal space into a gas chamber 21a at the vertically lower portion D11 and a stirring chamber 21b at the vertically upper portion D12. The separator 21c is made of a porous material and is configured to allow gas to pass through while not allowing the first powder S1 and the second powder S2 to pass through.

参考例に係る塗装装置２では、配管２ｃによって気体室２１ａに供給される圧縮気体Ｇは、分離体２１ｃを透過して撹拌室２１ｂに供給され、撹拌室２１ｂに供給される第１粉体Ｓ１および第２粉体Ｓ２は、圧縮気体Ｇによって撹拌されることで、混合される。混合された第１粉体Ｓ１および第２粉体Ｓ２は、開閉弁２ｍを介して圧送器２２に供給され、圧送器２２は、配管２ｂを介して供給される圧縮気体Ｇにより、第１粉体Ｓ１および第２粉体Ｓ２を搬送方向Ｄ２１に搬送する。圧送器２２は、配管２ａを介して吐出部（図示せず）と接続されており、吐出部は、圧縮気体Ｇによって搬送される第１粉体Ｓ１および第２粉体Ｓ２を対象物（図示せず）に向かって吐出する。 In the coating device 2 according to the reference example, the compressed gas G supplied to the gas chamber 21a through the pipe 2c passes through the separator 21c and is supplied to the stirring chamber 21b, and the first powder S1 and the second powder S2 supplied to the stirring chamber 21b are mixed by being stirred by the compressed gas G. The mixed first powder S1 and the second powder S2 are supplied to the pressure feeder 22 through the opening and closing valve 2m, and the pressure feeder 22 conveys the first powder S1 and the second powder S2 in the conveying direction D21 by the compressed gas G supplied through the pipe 2b. The pressure feeder 22 is connected to a discharge section (not shown) through the pipe 2a, and the discharge section discharges the first powder S1 and the second powder S2 conveyed by the compressed gas G toward the target (not shown).

このような塗装装置２を用いて、第１粉体Ｓ１（具体的には、粉体エポキシ樹脂）および第２粉体Ｓ２（具体的には、珪砂）によって上記同様の対象物Ｔに塗装しようとしたところ、撹拌室２１ｂにおいて、比重の大きい第２粉体Ｓ２（具体的には、珪砂）が鉛直下方Ｄ１１に溜まりやすく、第１粉体Ｓ１および第２粉体Ｓ２が所望の割合で混合された状態で、対象物Ｔに塗装することができなかった。これに対し、本実施形態に係る塗装装置１では、第１粉体Ｓ１が圧縮気体Ｇに十分に乗らずに流路１３１内で鉛直下方Ｄ１１に溜まるといった事態は、ほとんど生じておらず、第１粉体Ｓ１および第２粉体Ｓ２が所望の割合で混合された状態で、対象物Ｔを塗装することができた。 When such a coating device 2 was used to coat the same object T as described above with the first powder S1 (specifically, powdered epoxy resin) and the second powder S2 (specifically, silica sand), the second powder S2 (specifically, silica sand) having a large specific gravity was prone to accumulate vertically downward D11 in the stirring chamber 21b, and the first powder S1 and the second powder S2 could not be mixed in the desired ratio when coating the object T. In contrast, with the coating device 1 according to the present embodiment, the situation in which the first powder S1 does not sufficiently ride on the compressed gas G and accumulates vertically downward D11 in the flow path 131 rarely occurred, and the first powder S1 and the second powder S2 could be mixed in the desired ratio when coating the object T.

本実施形態では、第１粉体Ｓ１は、対象物Ｔを塗装する塗料によって構成され、第２粉体Ｓ２は、塗料に添加する充填材によって構成されている。この場合、第１粉体Ｓ１である塗料と、第２粉体Ｓ２である充填材とが混合された塗膜が得られるので、塗料の割合が低減されることで、塗膜を安価に形成することができる。 In this embodiment, the first powder S1 is composed of paint to be applied to the object T, and the second powder S2 is composed of a filler to be added to the paint. In this case, a coating film is obtained in which the first powder S1 (paint) and the second powder S2 (filler) are mixed, and the proportion of paint is reduced, allowing the coating film to be formed inexpensively.

本実施形態では、第１供給部１１および第２供給部１２と搬送部１３との間に、第１供給部１１および第２供給部１２から搬送部１３に第１粉体Ｓ１および第２粉体Ｓ２を落とし込む投入部１５を備えており、投入部１５は、第１粉体Ｓ１および第２粉体Ｓ２が投入される投入口１５ａと、第１粉体Ｓ１および第２粉体Ｓ２が排出される排出口１５ｂとを繋ぐ管状通路１５１を有している。管状通路１５１は、具体的には、第１供給部１１および第２供給部１２と離間して設けられている。この場合、管状通路１５１と第１供給部１１および第２供給部１２との間の部分が大気に開放されるので、第１供給部１１および第２供給部１２から負圧状態である流路１３１への第１粉体Ｓ１および第２粉体Ｓ２の過剰な吸引が抑制される。また、この場合、第１粉体Ｓ１および第２粉体Ｓ２とともに空気も吸引されるので、搬送部１３の能力を十分に発揮することができる。 In this embodiment, between the first supply unit 11 and the second supply unit 12 and the conveying unit 13, there is provided an input unit 15 that drops the first powder S1 and the second powder S2 from the first supply unit 11 and the second supply unit 12 to the conveying unit 13, and the input unit 15 has a tubular passage 151 that connects an input port 15a through which the first powder S1 and the second powder S2 are input and an outlet port 15b through which the first powder S1 and the second powder S2 are discharged. Specifically, the tubular passage 151 is provided away from the first supply unit 11 and the second supply unit 12. In this case, since the portion between the tubular passage 151 and the first supply unit 11 and the second supply unit 12 is open to the atmosphere, excessive suction of the first powder S1 and the second powder S2 from the first supply unit 11 and the second supply unit 12 to the flow path 131, which is in a negative pressure state, is suppressed. In this case, air is also sucked in along with the first powder S1 and the second powder S2, allowing the conveying unit 13 to fully utilize its capabilities.

本実施形態では、投入部１５は、投入口１５ａと排出口１５ｂとの間に設けられ、投入部１５に投入される第１粉体Ｓ１および第２粉体Ｓ２が当接する当接部１５ｃを有している。この場合、投入口１５ａから投入される第１粉体Ｓ１および第２粉体Ｓ２が、当接部１５ｃに当接することで、少なくとも搬送方向Ｄ２１への運動成分を増加させるように第１粉体Ｓ１および第２粉体Ｓ２の運動方向を変化させた後に、排出口１５ｂから排出されることで、流路１３１に投入される。そうすると、第１粉体Ｓ１および第２粉体Ｓ２は、流路１３１に投入される前に、流路１３１を流れる圧縮気体Ｇと同じ搬送方向Ｄ２１への運動成分が増加することで、圧縮気体Ｇに乗りやすくなる。これにより、本実施形態では、流路１３１内で重力により鉛直下方Ｄ１１に溜まることが抑制されるので、第１粉体Ｓ１および第２粉体Ｓ２を対象物Ｔに良好に吹き付けることできる。 In this embodiment, the input section 15 is provided between the input port 15a and the discharge port 15b, and has a contact portion 15c with which the first powder S1 and the second powder S2 input into the input section 15 come into contact. In this case, the first powder S1 and the second powder S2 input from the input port 15a come into contact with the contact portion 15c, thereby changing the direction of motion of the first powder S1 and the second powder S2 so as to increase at least the motion component in the conveying direction D21, and are then discharged from the discharge port 15b and input into the flow path 131. In this way, the first powder S1 and the second powder S2 are more likely to ride on the compressed gas G because the motion component in the same conveying direction D21 as the compressed gas G flowing through the flow path 131 increases before being input into the flow path 131. As a result, in this embodiment, accumulation of the powder vertically downward D11 due to gravity within the flow path 131 is suppressed, allowing the first powder S1 and the second powder S2 to be sprayed effectively onto the target object T.

１塗装装置
１１第１供給部
１１１第１タンク
１１２第１供給器
１１ａ第１供給口
１２第２供給部
１２１第２タンク
１２２第２供給器
１２ａ第２供給口
１３搬送部
１３１流路
１３ａ搬入口
１４吐出部
１５投入部
１５１管状通路
１５ａ投入口
１５ｂ排出口
１５ｃ当接部
１ａ、１ｂ配管
２塗装装置
２１混合タンク
２１ａ気体室
２１ｂ撹拌室
２１ｃ分離体
２２圧送器
２ａ、２ｂ、２ｃ配管
２ｍ開閉弁
Ｃ台車
Ｄ１鉛直方向
Ｄ１１鉛直下方
Ｄ１２鉛直上方
Ｄ２流路が延びる方向
Ｄ２１搬送方向
Ｇ圧縮気体
Ｎ１第１粉体が当接する当接部の法線
Ｎ２第２粉体が当接する当接部の法線
Ｒ回転体
Ｓ１第１粉体
Ｓ２第２粉体
Ｔ対象物（管体）
Ｘ１第１供給器の第１回転軸
Ｘ２第２供給器の第２回転軸
Ｘｒ対象物（管体）の中心軸
Ｙ１管状通路の排出口側の中心軸
Ｙ２管状通路の投入口側の中心軸
α１第１粉体が当接する当接部の法線と鉛直下方とのなす角
α２第２粉体が当接する当接部の法線と鉛直下方とのなす角
β１管状通路の排出口側の中心軸と流路の搬送方向とのなす角度
β２管状通路の投入口側の中心軸と流路の搬送方向とのなす角度 LIST OF SYMBOLS 1 Coating device 11 First supply section 111 First tank 112 First supply device 11a First supply port 12 Second supply section 121 Second tank 122 Second supply device 12a Second supply port 13 Transport section 131 Flow path 13a Carry-in port 14 Discharge section 15 Input section 151 Tubular passage 15a Input port 15b Discharge port 15c Contact section 1a, 1b Pipe 2 Coating device 21 Mixing tank 21a Gas chamber 21b Mixing chamber 21c Separator 22 Pressure transmitter 2a, 2b, 2c Pipe 2m Opening/closing valve C Cart D1 Vertical direction D11 Vertical downward D12 Vertical upward D2 Direction in which flow path extends D21 Transport direction G Compressed gas N1 Normal line of the contact part where the first powder comes into contact N2 Normal line of the contact part where the second powder comes into contact R Rotating body S1 First powder S2 Second powder T Target object (tube)
X1: first rotation axis of the first supply device; X2: second rotation axis of the second supply device; Xr: central axis of the target object (tube); Y1: central axis of the outlet side of the tubular passage; Y2: central axis of the inlet side of the tubular passage; α1: angle between the normal to the contact part where the first powder comes into contact and the vertically downward direction; α2: angle between the normal to the contact part where the second powder comes into contact and the vertically downward direction; β1: angle between the central axis of the outlet side of the tubular passage and the transport direction of the flow path; β2: angle between the central axis of the inlet side of the tubular passage and the transport direction of the flow path.

Claims

A coating device that coats an object by discharging a first powder and a second powder having different specific gravities toward the object using compressed gas,
a first supply unit that supplies the first powder at a first supply amount;
a second supply unit that supplies the second powder at a second supply amount;
a conveying section that is located vertically below the first supply section and the second supply section and has a flow path for the compressed gas;
a discharge unit connected to the conveying unit on a downstream side of the flow path and configured to discharge the first powder and the second powder toward the target,
the transport unit has an inlet on a vertically upper side thereof that is in communication with the flow path, and through which the first powder and the second powder are dropped from the first supply unit and the second supply unit into the flow path, the inlet being common to the first powder and the second powder;
the conveying unit conveys the first powder and the second powder, each of which is dropped into the flow path from the inlet, to a downstream side of the flow path by the compressed gas;
the discharge unit discharges the first powder and the second powder transported by the compressed gas from the transport unit toward the target object at a predetermined ratio corresponding to the first supply amount and the second supply amount.
Painting equipment.

The first powder is composed of a paint for painting the object,
The second powder is composed of a filler to be added to the paint.
2. The coating apparatus according to claim 1.

a feed unit between the first supply unit and the transport unit, and between the second supply unit and the transport unit, the feed unit dropping the first powder and the second powder from the first supply unit and the second supply unit onto the transport unit,
the input section has a tubular passage connecting an input port through which the first powder and the second powder are input and an output port through which the first powder and the second powder are discharged,
The tubular passage is provided spaced apart from the first supply portion and the second supply portion.
3. The coating apparatus according to claim 1 or 2.

the tubular passage is provided between the inlet and the outlet, and has a contact portion with which the first powder and the second powder input to the inlet come into contact, and the first powder and the second powder input from the inlet come into contact with the contact portion, thereby changing the direction of motion of the first powder and the second powder so as to increase a motion component in at least the conveying direction, and then the first powder and the second powder are discharged from the outlet, thereby being input into the flow path.
4. The coating apparatus according to claim 3.