JP3145041U - Painting system - Google Patents

Abstract

A coating system capable of performing uniform color coating with good mixing efficiency is provided.
A first supply line for supplying a base paint to a spray gun, a second supply line for supplying a color paint of a different type from the base paint, and a base paint on the upstream side of the spray gun. A mixer 4 for mixing the color paint is provided, and the base paint and the color paint are stirred and mixed by this mixer and supplied to the spray gun 1. Therefore, it is possible to improve the mixing efficiency and create a paint having a uniform hue. In addition, when changing colors, only the color paint in the second supply line 3 needs to be changed, so that the color change operation can be easily performed.
[Selection] Figure 1

Description

  The present invention relates to a coating system for applying a coating object such as a coiled steel plate used as a ship exterior material or a foundation material for civil engineering construction.

  Conventionally, in this type of coating system, for example, a base paint is generally poured into a paint tank, mixed with a curing agent, sent to a spray gun through a pump, and sprayed by the spray gun.

  In addition, when applying colors, the base paint and the color paint are poured and mixed into the paint tank and then sprayed with a spray gun through a pump, so the color of the color paint is changed by the paint tank. All the paint contained in was removed, and the color was changed after washing the entire coating machine including the paint tank.

  For this reason, in order to change the color in the painting to which the color is applied, the remaining paint must be removed every time the color is changed, and there are problems of removing the remaining paint, paint loss, and disposal of the removed paint. , Tanks, hoses, airless pumps, etc., need to clean all the painting lines, and the line operation time is lost or a large amount of organic solvent is required for cleaning. There was a problem of being bulky.

  In Utility Model Registration Document 1, in order to solve the above problem, the base paint supply line and the color paint supply line are connected to a spray gun, and the color paint is added to and mixed with the base paint at the tip of the gun. Spray painting was done.

As a result, when changing colors, it is sufficient to replace and wash only the container containing the color paint and the pipe connecting the container and the spray gun, so that the effort of changing colors can be reduced. ing.
JP 2001-340788 A

  By the way, as in Patent Document 1, mixing of the base paint and the color paint is performed at a position ahead of the discharge port of the spray gun, that is, outside the spray gun discharge port. Appearance of a new coating system is also desired.

  An object of the present invention is to provide a new coating system that can perform uniform color coating with good mixing efficiency.

  In order to achieve the above object, a painting system of the present invention includes a first supply line for supplying a base paint to a spray gun, a second supply line for supplying a color paint of a different type from the base paint, A mixer for mixing the base paint and the color paint is provided upstream of the spray gun, and the base paint and the color paint are mixed by the mixer and supplied to the spray gun. Yes.

  According to the above configuration, the mixer is provided on the upstream side of the spray gun, and the base paint and the color paint are mixed and supplied to the spray gun by the mixer, so that the mixing efficiency is improved and the uniform color is obtained. Paint can be created. In addition, when the color is changed, only the color paint in the second supply line has to be changed, so that the color can be changed easily.

  The mixer is a static mixer in which a plurality of restricting plates are arranged in the axial direction inside a cylindrical casing, and the adjoining restricting plates are casings so that the internal paint flow path meanders in a zigzag shape in the axial direction. The base paint supply pipe is connected to one side in the axial direction of the casing, and the color paint supply pipe is connected near the base paint supply pipe. .

  According to the above configuration, the plurality of restricting plates are arranged in the axial direction, adjacent restricting plates protrude alternately from the inner peripheral surface of the casing in the axial center direction, and the internal paint flow path is zigzag in the axial direction. Since the meandering is performed, the base paint and the color paint are agitated and mixed.

  In this case, a first interval having a relatively long interval between the plurality of restricting plates and a second interval shorter than the first interval are set, and the first interval and the second interval are alternately arranged in the axial direction. It is arranged.

  According to the said structure, since a pressure change is produced between the control boards in which space | intervals differ, the flow of a fluid changes intentionally and it can raise mixing efficiency. Moreover, the mixing efficiency can be further increased by changing the fluid path in a zigzag manner.

  Another example of the mixer is a dynamic mixer in which a plurality of mixing gears mesh with each other in a cylindrical casing and are rotatably provided.

  According to the said structure, when a dynamic mixer is employ | adopted as a mixer, since it is a high voltage | pressure and the flow velocity is quick, it becomes easy to mix. Moreover, because of the gear system, the injection amount can be changed by changing the gear.

  As described above, according to the present invention, the base paint and the color paint are mixed and supplied to the spray gun by the mixer provided on the upstream side of the spray gun. Can create paint. In addition, when the color is changed, only the second supply line to which the color paint is supplied needs to be changed, so that the color can be changed easily.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a spraying station in a coating system showing an embodiment of the present invention.

  As shown in FIG. 1, the coating system of this embodiment includes a first supply line 2 that supplies a base paint to the spray gun 1, and a second supply line that supplies a color paint of a different type from the base paint. 3 and a mixer 4 provided on the upstream side of the spray gun for mixing the base paint and the color paint, and the base paint and the color paint are mixed by the mixer 4 so that the spray gun is mixed. 1 is supplied.

  The first supply line includes a tank 7 for storing the base paint 5, a pipe line 8 extending from the tank to the spray gun 1, and an airless pump 9 interposed in the pipe line 8 (see FIG. 9). ).

  Base paint is stored in the tank 7. The base paint is composed of a main agent containing a pigment (for example, a gray pigment), a curing agent, and a solvent.

  This base paint is temporarily stored in the relay tank 7. The main agent, curing agent and solvent are supplied from the container containing the main agent, the container containing the curing agent, and the container containing the solvent (both not shown) to the tank 7 side through piping and a pressure pump. Then, the desired base coating material is obtained by mixing and stirring in the tank 7 with a stirrer (not shown). Alternatively, the mixture is stirred and mixed by a mixer in a supply path to the tank 7 and supplied to the tank 7.

  In this supply line, the mixing ratio of the main agent, the curing agent and the solvent is determined by detecting the flow rate by a flow rate sensor (not shown) provided in the middle of the supply line and operating the flow rate adjustment valve based on the signal to obtain the desired amount. Main component, curing agent and solvent.

  The tank 7 and the spray gun 1 are connected by a pipe 8. An airless pump 9 is interposed in the middle of the pipe 8.

  As shown in FIG. 1, the spray gun 1 is disposed at a spraying station 12. The installation location of the tank 7 is set at a location away from the transfer target from the object to be painted. Therefore, the installation positions of the tank 7 and the airless pump 9 are usually set at a location 30 m to 50 m away from the spraying station. The airless pump 9 normally feeds the base paint at 10 to 20 MPa.

  The spray gun 1 is an airless type spray gun having a known structure, and is provided in a spraying station so as to be able to reciprocate in a direction orthogonal to the conveying direction of the object to be coated.

  The spray station 12 includes a second supply line 3 and a mixer 4. The second supply line 3 includes a tank 13 in which color paint is accommodated. The color paint is, for example, a pigment (brown) mixed with a solvent. A pressure supply pump 15 is provided in the supply pipe 14 extending from the tank 13 to the mixer 4. In addition, as shown in FIG. 9, a check valve 16, a variable flow control valve 17, and a pressure adjustment valve 18 are interposed so that a color paint having a desired flow rate is delivered at a predetermined pressure.

  The automatic coating machine 20 shown in FIG. 1 includes a roller conveyor 22 for conveyance arranged in the conveyance direction of the object 21 to be coated, and a portal-type column 23 arranged so as to straddle the roller conveyor 22. A spray gun 1 that is reciprocally movable in a direction orthogonal to the conveying direction of the coating object 21 along the cross rail of the gate-shaped column 23 is provided, and the steel plate 21 that is the coating object is conveyed on the roller conveyor 22. Then, when passing through the gate-shaped support 23, the paint is sprayed from the spray gun 1. The gate-type support 23 constitutes the spraying station 12.

  FIG. 2 is an exploded perspective view of the static mixer, and FIG. 3 is a sectional view thereof. As shown in the figure, the mixer 4 is a static mixer in which a plurality of regulating plates 26 are arranged in the axial direction inside a cylindrical casing 25. Adjacent regulation plates 26 are alternately projected in the center direction of the shaft 27 from the inner peripheral surface of the casing 25 so that the paint flow path inside the casing 20 meanders in a zigzag shape in the axial direction.

  A base paint connection port 29 is formed on the cover 28 on one axial side of the casing 25, a color paint supply connection port 30 is formed near the base paint side connection port 29, and pipes are respectively connected thereto. ing. In the drawing, reference numeral 31 denotes a lid on the other side of the casing 25 in the axial direction. A discharge port 32 is formed in the lid 31 at a position facing the supply port for the base paint and the color paint with the shaft 27 interposed therebetween.

  And in the mixer 4, the 1st space | interval L1 in which the space | interval of the some control board 26 is comparatively long, and the 2nd space | interval L2 shorter than it are set, The 1st space | interval L1 and the 2nd space | interval The intervals L2 are alternately arranged in the axial direction of the shaft 27.

  FIG. 3 shows details of the mixer. FIG. 4A is a longitudinal sectional view when cut along the axial direction of the mixer, and shows cutting positions in the subsequent drawings. The cross section 1 is a case where the cross section is cut along the shaft 27, and FIG.

  The cross section 2 is a case where the shaft 27 is cut in a direction perpendicular to the axis 27, and FIG.

  The cross section 3 is a case where the cross section is cut along the first regulating plate 26a on one side, and FIG.

  The cross section 4 is a case of cutting along the second restriction plate 26b on the other side, and FIG.

  The cross-sectional area of the passage flow path in the casing 25 is sequentially changed from the paint supply side to the passage flow passage cross-sectional area C⇒D⇒C⇒E⇒C⇒D⇒C⇒E⇒C⇒D⇒C⇒E⇒C. Channel cross-sectional area C = inner circumferential cross-sectional area of casing 25—cross-sectional area of shaft portion, flow-path cross-sectional area D = inner peripheral cross-sectional area of casing 25— [cross-sectional area of first restricting plate 26a (including shaft section) ], The flow path cross-sectional area E = the inner peripheral cross-sectional area of the casing 25− [the cross-sectional area of the second regulating plate 26b (including the shaft section)] Since the cross-sectional area of the first restricting plate 26a and the cross-sectional area of the second restricting plate 26b are equal, the cross-sectional area D = E.

  However, the interval between the first restriction plate 26a and the adjacent second restriction plate 26b is set to a first interval L1 that is relatively long and a second interval L2 that is shorter than the first interval L1. Since the interval L1 and the second interval L2 are alternately arranged in the axial direction of the shaft 27, the volume of the passages A and B specified by the intervals L1 and L2 is different. It will be. In FIG. 3, the passage channel A is set to have a larger channel volume than the passage channel B. For this reason, pressure variation occurs between the passage channel A and the passage channel B, and a zigzag passage along the axial direction is formed, so that the paint flowing therethrough is sufficiently stirred and mixed.

  FIG. 4 shows the cross-sectional areas of the passage channels A to E in FIG. (A) is a longitudinal sectional area of the passage channel A, (b) is a longitudinal sectional area of the passage channel B, (c) is a transverse area of the passage channel C, (d) is a transverse area of the passage channel D, (E) shows the cross-sectional area of the passage E.

  In the above configuration, the base paint is sent from the first supply line 2 to the mixer 4, and the color paint is sent from the second supply line 3 to one side of the mixer 4. Then, the mixer 4 mixes the base paint and the color paint and supplies them to the spray gun 1.

  The mixer 4 is a static mixer in which a plurality of restricting plates 26 are arranged in the axial direction inside a cylindrical casing 25, and adjacent restricting plates so that the internal paint flow path meanders in a zigzag shape in the axial direction. 26 protrude from the inner peripheral surface of the casing 25 alternately in the axial center direction. In addition, the first restriction plate 26a and the second restriction plate 26b adjacent to each other have a first interval L1 that is relatively long and a second interval L2 that is shorter than the first interval L1. Since the intervals L1 and the second intervals L2 are alternately arranged in the axial direction, a pressure fluctuation occurs due to a difference in the channel cross-sectional area and the channel volume.

  Therefore, the paint passing through the casing 25 of the mixer 4 is zigzag meandering in the axial direction, and the base paint and the color paint due to the pressure fluctuation caused by the difference in the channel cross-sectional area and the difference in the channel volume. Is reliably and rapidly stirred and mixed.

  Therefore, the spray gun 1 provided on the downstream side of the mixer 4 is supplied with a paint having a good mixing efficiency, so that the mixing efficiency can be improved and a paint having a uniform hue can be created.

  In addition, when the color is changed, the color paint tank 13 of the second supply line 3 is replaced. At this time, the cleaning of the first supply line 2 for supplying the base paint is basically unnecessary.

  Washing is performed from the second supply line 3 to the mixer 4 and the spray gun 1 or, even if the color is changed without washing because the color paint to be supplied is small, it is blown away after the color change. The color can be changed smoothly.

<Second Embodiment>
FIG. 5 is a block diagram showing a coating line using a static mixer according to the second embodiment of the present invention. 6 is a schematic cross-sectional view of the mixer, FIG. 7 is a perspective view of a state in which a part of the mixer is opened, and FIG. 8 is a perspective view of a state in which a spray gun is connected to the downstream side of the mixer. .

  The present embodiment is characterized in that two color paint supply lines 3 and 3A are provided and another static mixer is used as the mixer 4.

  That is, in the present embodiment, two supply lines 3 and 3A are provided as the second supply line 3 in order to supply two kinds of color paints different from the base paint.

  As shown in FIG. 5, each supply line 3, 3 </ b> A is provided with a flow meter 37 from the supply source side, and a pressure regulating valve 18, a flow control valve 17, and a check valve 16 are disposed downstream thereof. Yes. The throttle amount of the flow control valve 17 is controlled based on the flow signal from the flow meter 37.

  In the supply line 3, for example, a paint whose A pigment is brown is supplied. Further, in the supply line 3A, a paint having a green B pigment is supplied. Further, as the base paint supplied from the first supply line 2, a gray paint can be exemplified.

  The first supply line 2 and the second supply lines 3, 3 </ b> A are connected to the mixer 4. The mixer 4 is a static mixer in which a plurality of regulating plates 26 are arranged in the axial direction inside a cylindrical casing 25. Adjacent regulation plates 26a, 26b are alternately projected from the inner peripheral surface of the casing 25 toward the center of the flow path so that the paint flow path inside the casing 20 zigzags in the axial direction.

  The difference from the mixer in the first embodiment is that there is no member corresponding to the shaft 27, the interval between the regulating plates 26a and 26b is constant in the axial direction, and the shape of the regulating plates 26a and 26b. However, the axial center direction is inclined toward the downstream side of the flow path, and the tip 26c is further bent to the downstream side of the flow path.

  Further, in the mixer 4, a base paint connection port 29 is formed on the one axial side lid portion of the casing 25, and two color paints are formed on the peripheral surface of the casing 25 near the base paint side connection port 29. Supply connection ports 30 and 30a are formed, and pipes are connected to each other. Further, the mixed paint discharge port 32 is formed on the other axial side of the casing 25.

  Since the spray gun 1 connected to the downstream side of the mixer 4 via the pipe 33 is the same as that of the first embodiment, the description thereof is omitted. In FIG. 8, the spray gun 1 is provided with an air inlet 34 for driving a channel opening / closing valve that opens and closes the channel. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

  In the above configuration, the base paint is sent from the first supply line 2 to the mixer 4, and one of the two color paints from the two supply lines 3 and 3A of the second supply line or Two kinds of color paints are sent to one side of the mixer 4. Then, the mixer 4 mixes the base paint and the color paint and supplies them to the spray gun 1.

  The mixer 4 is a static mixer in which a plurality of restricting plates 26a and 26b are arranged in the axial direction inside a cylindrical casing 25, and the internal paint flow path is pumped while meandering in a zigzag shape in the axial direction. Therefore, the base paint and the color paint are rapidly and reliably stirred and mixed.

  Therefore, the spray gun 1 provided on the downstream side of the mixer 4 is supplied with a paint having a good mixing efficiency, so that the mixing efficiency can be improved and a paint having a uniform hue can be created.

  Moreover, at the time of color change, the supply pump 15 of the supply line 3 or 3A that has been used so far among the second supply lines 3 and 3A is stopped to stop the supply of the color paint, and the other color paint When the supply pump of the supply line 3A or 3 is operated, the color paint is sent from the supply line to the mixer 4, mixed with the base paint, and supplied to the spray gun 1. At the beginning of the supply line switching, the color paint before the color change remains in the spray gun 1, but the color change can be performed smoothly by blowing off for a short time.

<Third Embodiment>
9 is a conceptual diagram of a coating system using a dynamic mixer showing a third embodiment of the present invention, FIG. 10 is a sectional view of the mixer of FIG. 9, and FIG. 11 is a perspective view of the mixer.

  In the present embodiment, unlike the first embodiment and the second embodiment, the mixer 4 is configured such that a plurality of (two in this embodiment) mixing gears 41 and 42 are rotatable in a cylindrical casing 40. It is a dynamic mixer provided to mesh.

  The casing 40 has an elliptical cylindrical shape, and mixing gears 41 and 42 are provided inside.

  The gears 41 and 42 have gear shafts arranged in parallel, and the liquid (paint) flowing along the outer peripheral surface of the gear is compressed by the meshing portion of the gear and mixed by stirring, and is positioned downstream in the rotational direction of the gear. It ejects from the discharge port 46 to be discharged. The gear is driven by an external servo motor 48. The gears 41 and 42 are variable speed, and can be controlled at a variable speed by the flow rate of the supply line.

  A base paint supply port 43, two types of color paint supply ports 44 and 45, and a mixed paint discharge port 46 are formed on the peripheral surface of the casing 40 in a direction perpendicular to the gear shaft. The base paint supply port 43 and the discharge port 46 are formed at opposing positions with the center of the casing 40 in between. The color paint supply ports 44 and 45 are formed at opposite positions with a 90-degree phase difference from the base paint supply port 43 and the discharge port 46 across the center of the casing 40.

  In the above configuration, when the gears 41 and 42 are rotationally driven by the external servo motor 48, the base paint flowing in from the base paint supply port 43 and the color paint flowing in from the color paint supply ports 44 and 45 are mixed, and the gears are mixed. Since it is compressed and mixed at the meshing points 41 and 42, for example, it can be mixed at a high pressure of about 10 MPa to 20 MPa and a high flow rate, and a mixed paint with good mixing efficiency can be obtained.

  In addition, since the casing 41 has a negative pressure due to the rotation of the gears 41 and 42, the paint easily flows in from the supply ports 43, 44, and 45, and is easily mixed with stirring.

  Moreover, since the rotational drive speed of the gears 41 and 42 is variable, the negative pressure in the casing can be adjusted, and the amount of paint injected can be changed.

    In this way, the base paint and the color paint are mixed and supplied to the spray gun 1 by the mixer 4 provided on the upstream side of the spray gun 1, so that the mixing efficiency is improved and the paint having a uniform color is obtained. Can be created promptly. In addition, when the color is changed, only the second supply line 3 to which the color paint is supplied needs to be changed, so that the color can be changed easily.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added within the scope of the present invention.

The perspective view of the spraying station in the coating system which shows one Embodiment of this invention Disassembled perspective view of static mixer It is sectional drawing of the mixer of FIG. 2, (a) is a longitudinal cross-sectional view when cut | disconnecting along the axial direction of a mixer, (b) is a cross-sectional view of the cross section 1 shown to the same figure (a), (c) ) Is a cross-sectional view of the cross section 2 shown in FIG. 4A, FIG. 4D is a cross-sectional view of the cross section 3 shown in FIG. 1A, and FIG. Figure 3 represents a cross-sectional area of each of the passage channels A to E, (a) is a sectional area of the passage channel A, (b) is a sectional area of the passage channel B, and (c) is a section of the passage channel C. (D) is a cross-sectional area of the passage channel D, and (e) is a diagram showing a cross-sectional area of the passage channel E. Configuration diagram showing the painting line of another static mixer of the present invention Schematic cross section of the mixer of FIG. The perspective view of the state which opened a part of mixer of FIG. The perspective view which shows the state which connected the spray gun to the downstream of the mixer of FIG. Conceptual diagram of a coating system using a dynamic mixer showing a third embodiment of the present invention (A) is a front sectional view of the dynamic mixer of FIG. 9, and (b) is a side view of the same. FIG. 9 is a perspective view of the dynamic mixer shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spray gun 2 1st supply line 3 2nd supply line 4 Mixer 5 Base paint 7 Tank 8 Pipe line 9 Airless pump 12 Spraying station 13 Tank 15 Pressure feed pump 16 Check valve 17 Flow control valve 18 Pressure control valve DESCRIPTION OF SYMBOLS 20 Automatic coating machine 21 Object 22 Roller conveyor 23 Gate support | pillar 25 Casing 26 Restriction board 27 Shaft 28 Lid 29 Connection port 30 Connection port 31 Lid 32 Discharge port 33 Piping 34 Air inlet 37 Flow meter 40 Casing 41, 42 Mixing gear 43 Base paint supply port 44, 45 Color paint supply port 46 Discharge port

Claims (4)

A first supply line for supplying a base paint to a spray gun; a second supply line for supplying a color paint of a different type from the base paint; and the base paint and the color paint upstream of the spray gun Is provided, and a base paint and a color paint are mixed by the mixer and supplied to the spray gun. The mixer is a static mixer in which a plurality of restriction plates are arranged in an axial direction inside a cylindrical casing, and adjacent restriction plates are arranged so that an internal paint flow path meanders in a zigzag shape in the axial direction. It protrudes alternately in the axial center direction from the inner peripheral surface of the casing, the base paint supply pipe is connected to one side of the casing in the axial direction, and the color paint supply pipe is connected near the base paint supply pipe. The coating system according to claim 1, wherein: A first interval having a relatively short interval between the plurality of restricting plates and a second interval longer than the first interval are set, and the first interval and the second interval are alternately positioned in the axial direction. The coating system according to claim 2, wherein the coating system is set as follows. The coating system according to claim 1, wherein the mixer is a dynamic mixer provided in a cylindrical casing so that a plurality of mixing gears are rotatably engaged with each other.

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