JP7229708B2 - coating equipment - Google Patents

Description

The present invention relates to a coating device.

At the color mixing factory of a paint company, a large number of sample boards coated with the prepared paint are prepared. In this work, it is necessary to prepare a plurality of sample plates that are uniform in hue, brightness, brightness, and finish.
As a method for preparing the sample plate, there is manual painting using an air spray gun. In this case, the operator should be a skilled worker.
Next, the use of robotic coating machines, similar to automated lines in paint factories, to create sample plates is being considered. This method does not require skilled workers, but has the problem of requiring large-scale equipment. In view of this, a coating apparatus that does not require a large installation space has been proposed (Patent Document 1).

Patent No. 4836955

Although the coating apparatus of Patent Document 1 described above can easily prepare a coated plate, there is a need for improvement in order to prepare a coated plate having uniform hue, brightness, brightness and finish. In the coating apparatus of Patent Literature 1, for example, paint dust generated during the coating operation may affect the finish (hue, brightness, brightness, and uniformity of finish) of the coated object.

A problem to be solved by an aspect of the present invention is to provide a coating apparatus capable of stabilizing the hue, brightness, brilliance and finish of a coated object.

In order to solve the above problems, the present invention provides the following aspects.
A coating apparatus according to a first aspect includes a cover wall having a vertically extending cylindrical side peripheral wall and a coating booth in which an object to be coated is carried inside the side peripheral wall. an object-to-be-coated support base for supporting the accommodated object-to-be-coated object; and a paint from above the object-to-be-coated object supported on the object-to-be-coated object support base provided in the coating booth toward the object-to-be-coated object. an air supply device that supplies air to the inner side of the cover wall from a position above the spray gun on the cover wall; and a lower end opening of the side peripheral wall of the cover wall from the cover wall It has an exhaust device for exhausting the air inside, and a lower filter for blocking a position below the workpiece support on the inner side of the side peripheral wall, and the side peripheral wall of the cover wall extends in the vertical direction with a constant cross section. a cylindrical side peripheral main wall forming an inner space; a tapered cylindrical wall extending downward from the lower end of the side peripheral main wall in a tapered shape; and a tapered cylindrical wall extending downward from the lower end of the tapered cylindrical wall with a constant cross section. The lower filter is a filter that closes the outlet cylinder wall inside the side peripheral wall, and is a member that first closes a position below the workpiece support on the inside of the side peripheral wall is the lower filter, the painting booth is composed of a main chamber that is an inner space of the side peripheral main wall, and a space that extends from the main chamber to the lower filter, and the workpiece support is the A workpiece is supported within the main compartment of the paint booth.
The coating apparatus is fixed to a support bar passed through an elongated hole formed in the side peripheral wall around the coating booth and extending in the circumferential direction thereof, and to a distal end portion of the support bar disposed inside the cover wall. and a moving mechanism for moving the support bar disposed outside the cover wall in the extending direction of the long hole and the inner and outer directions of the side peripheral wall; a moving mechanism cover wall for accommodating the moving mechanism of the object moving device; the inner space of the moving mechanism cover wall communicates with the coating booth through the long hole; It is also possible to employ a configuration in which the object to be coated is supported at a position spaced apart above the elongated hole of the side peripheral wall.
The coating apparatus may further include a side air supply device for supplying temperature- and humidity-controlled conditioned air to the inner side of the moving mechanism cover wall.
The coating apparatus may further include a spray gun moving device that moves the spray gun.

According to the coating apparatus according to the aspect of the present invention, it is possible to stabilize the hue, brightness, brilliance and finish of the coated object.

1 is a front sectional view showing a coating apparatus according to a first embodiment of the invention; FIG. FIG. 2 is a front cross-sectional view showing a comparative (first comparative) coating apparatus with respect to the coating apparatus of FIG. 1; It is a front cross-sectional view showing a coating apparatus according to a second embodiment of the present invention. FIG. 4 is a cross-sectional plan view showing a structure near a coating booth of the coating apparatus of FIG. 3; 2 is a front cross-sectional view showing a comparative (second comparative) coating device for the coating device of FIG. 1; FIG.

A coating apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 shows a coating apparatus 10 of a first embodiment according to the invention.
In addition, in FIG. 1, description will be made with the upper side as the upper side and the lower side as the lower side.

The coating apparatus 10 of the embodiment shown in FIG. 1 includes a cover wall 20 inside which is secured a coating booth 20S into which an object T to be coated is carried, and the object T to be coated which is carried into the inside of the cover wall 20 is placed. and a spray gun 40 provided inside the cover wall 20 .
The coating apparatus 10 also includes an air supply device 50 that supplies conditioned air with adjusted temperature and humidity to the space inside the cover wall 20, an exhaust device 60 that exhausts the air inside the cover wall 20, and an upper part provided inside the cover wall 20. It also has a filter 71 and a lower filter 72 .

The cover wall 20 has a cylindrical side peripheral wall 21 supported by a support member (not shown) so as to extend in the vertical direction, and a top wall 22 covering the side peripheral wall 21 .
The ceiling wall 22 is provided at the upper end of the side peripheral wall 21 so as to cover the inner space of the side peripheral wall 21 .

The upper filter 71 is provided inside the upper end portion of the cover wall 20 so as to vertically divide the space inside the cover wall 20 . The upper filter 71 is provided at a position spaced downward from the top wall 22 within the side peripheral wall 21 of the cover wall 20 and vertically partitions the space inside the cover wall 20 .
The lower filter 72 is provided inside the lower end portion of the cover wall 20 so as to vertically divide the space inside the cover wall 20 .
The paint booth 20S refers to the space between the upper filter 71 and the lower filter 72 inside the cover wall 20 .

A side peripheral wall 21 of the cover wall 20 shown in FIG. It also has an extending tapered tubular wall 24 and an outlet tubular wall 25 extending downward from the lower end of the tapered tubular wall 24 with a constant cross section.

The lower filter 72 is provided at the upper end of the outlet tube wall 25 so as to extend in a horizontal direction perpendicular to the axial direction of the cover wall 20 (vertical direction in FIG. 1), and divides the inner space of the cover wall 20 vertically. ing.
The coating booth 20S of the coating apparatus 10 shown in FIG. 1 includes a main chamber portion 20S1, which is an inner space of the side peripheral main wall portion 23, and a tapered cylindrical wall portion 24 inside the main chamber portion 20S1, which tapers downward from the lower end of the main chamber portion 20S1. and a secured tapered chamber portion 20S2. The tapered chamber portion 20S2 extends from the lower end of the main chamber portion 20S1 to the lower filter 72. As shown in FIG.

The tapered tubular wall 24 of the coating apparatus 10 shown in FIG. 1 is formed in a tapered shape in which the outer peripheral size and the inner peripheral size decrease downward from the upper end.
The side peripheral wall 21 of the cover wall 20 has a configuration capable of securing the main chamber portion 20S1 of the coating booth 20S and the tapered chamber portion 20S2 extending downward from the lower end of the main chamber portion 20S1 to the lower filter 72. good. For example, the side peripheral wall 21 can also adopt a configuration in which the outer peripheral size extends in the vertical direction with a constant size.

The arrangement position of the lower filter 72 with respect to the side peripheral wall 21 may be lower than the upper end portion of the outlet tubular wall 25 .
The coating booth 20S may have a main chamber portion 20S1 and a lower chamber portion including a tapered chamber portion 20S2 and extending downward from the main chamber portion 20S1 to the lower filter 72. In the configuration in which the lower filter 72 is provided below the upper end of the outlet tube wall 25, the paint booth 20S is located above the lower filter 72 in the tapered chamber 20S2 and the inner space of the outlet tube wall 25. It has a lower chamber made up of a part that
Note that the coating booth 20S of the coating apparatus 10 shown in FIG. 1 has a lower chamber portion composed only of the tapered chamber portion 20S2 .

A side peripheral main wall portion 23 of the side peripheral wall 21 shown in FIG. 1 is configured in a rectangular tube shape by four flat side walls 21a.
One of the four side walls 21a of the side peripheral main wall portion 23 is formed with a window hole 21b through which the object to be coated T and the object to be coated created by coating the object T with paint on the inside of the cover wall 20 can pass. It is

The object to be coated T can be placed on the tray 30 inside the cover wall 20 from the outside of the cover wall 20 through the window hole 21b. Further, the object to be coated, which is coated with paint on the object T inside the cover wall 20, can be taken out from the inside of the cover wall 20 to the outside of the cover wall 20 through the window hole 21b.

Further, the side peripheral main wall portion 23 of the cover wall 20 shown in FIG. 1 includes an opening/closing door 21d that opens and closes the window hole 21b.
The opening/closing door 21d is rotatably or slidably attached to the side wall 21a (window hole forming side wall 21c) in which the window hole 21b of the side circumferential main wall portion 23 is formed. The opening/closing door 21d can open and close the window hole 21b by rotating or sliding with respect to the window hole forming side wall 21c.

The opening/closing door 21d is not limited to one that is rotatably or slidably attached to the window hole forming side wall 21c, and one that can be attached to and detached from the window hole forming side wall 21c from the outside of the cover wall 20 can also be employed.

The coating apparatus 10 of FIG. 1 has a workpiece moving device including a tray 30 .
The object moving device has a moving mechanism (not shown) that moves the tray 30 laterally with respect to the cover wall 20 .
The tray 30 is supported in the main chamber 20S1 of the coating booth 20S (hereinafter also referred to as the coating booth main chamber) by a coating object moving device.

The tray 30 shown in FIG. 1 has a configuration in which ribs 32 projecting from one side of the main plate 31 are formed on the outer peripheral portion of the main plate 31 in the form of a flat plate.
The object to be coated T is removably mounted on the upper surface of the main plate 31 (object mounting surface) inside the ribs 32 of the tray 30 .
The tray 30 positions the workpiece T placed on the main plate 31 (hereinafter also referred to as the tray main plate) by the ribs 32 on the outer periphery of the tray main plate 31 .
The tray 30 is supported by the apparatus for moving the object to be coated so that its upper surface (the upper surface of the tray main plate 31 in FIG. 1) is oriented horizontally.

The spray gun 40 is supported in the coating booth main chamber 20S1 by a spray gun moving device (not shown).
A spray gun movement device supports the spray gun 40 above the tray 30 and moves the spray gun 40 laterally with respect to the cover wall 20 .
The spray gun 40 sprays the coating material downward to coat the coating material T placed on the tray 30 (in FIG. 1, the upper surface of the tray main plate 31; hereinafter the same).

The position of the spray gun 30 can be adjusted in the vertical direction by driving a gun elevating mechanism provided in the spray gun moving device.
The spray gun 30 can change the distance from the object T in the vertical direction.

The spray gun 40 is connected to a coating material supply device, an air control panel, a high voltage generator, a cable (power supply cable), etc., which are not shown.
Examples of the spray gun 40 include a rotating bell type atomizing coating machine and an air atomizing coating machine.

A rotary bell-type atomizing coating machine has a bell cup that rotates at a high speed at the tip of a gun, and atomizes paint discharged into the bell cup by centrifugal force due to the rotation of the bell cup. In addition, the rotating bell-type atomizing coating machine ejects shaping air for controlling the pattern width of the paint spray pattern by adjusting the scattering direction of the atomized particles of the paint scattered radially outward from the outer peripheral edge of the bell cup. Equipped with an air nozzle.

The air atomization type coating machine is equipped with an ejection port for compressed air (atomization air) that surrounds the vicinity of the paint ejection port. It is a type of coating machine that atomizes paint by Further, the air atomization type coating machine can employ a configuration in which a pattern air ejection port for controlling the pattern width of the spray pattern is provided outside the compressed air ejection port.

The air control panel is a device that controls the air pressure for rotating the bell of the rotary bell type atomizing coating machine, the flow rate of shaping air, and the like.
The high voltage generator is a device for applying the atomized particles atomized by the atomizing device to the object 50 to be coated with static electricity.

In FIG. 1, a plate-like object T (hereinafter also referred to as a plate to be coated) is used.
The coating apparatus 10 of FIG. 1 coats the coating plate T placed on the tray 30 so as to overlap the tray main plate 31 with the paint sprayed from the spray gun 40, and the tray main plate 31 of the coating plate T is reversed. It is possible to create a coated object (coated plate) in which a coating film is formed on the side surface (upper surface).

As shown in FIG. 1, the air supply device 50 and the exhaust device 60 are arranged outside the cover wall 20 .
The air supply device 50 supplies conditioned air through an air supply pipe 52 to an air supply head 51 (air supply port) provided in the central portion of the top wall 22 of the cover wall 20 . The air supply head 51 is fixed to the ceiling wall 22 by being inserted into an opening 22a formed in the central portion of the ceiling wall 22. As shown in FIG. The air supply head 51 is formed with an air supply outlet (not shown, air supply port) that opens into the space inside the cover wall 20 .
The conditioned air supplied from the air supply device 50 to the air supply head 51 through the air supply pipe 52 is supplied from the air supply outlet of the air supply head 51 to the inner space of the cover wall 20 .

The exhaust device 60 is connected to the lower end opening of the side peripheral wall 21 of the cover wall 20 (the lower end opening of the outlet cylinder wall 25 ) via an exhaust pipe 61 so as to be able to suck the air inside the cover wall 20 .
The exhaust device 60 sucks and exhausts the air inside the cover wall 20 from the lower end opening of the side peripheral wall 21 of the cover wall 20 via the exhaust pipe 61 .

The coating apparatus 10 shown in FIG. 1 uses a push-pull method in which conditioned air is supplied to the inside of the cover wall 20 from the air supply device 50 and the air inside the cover wall 20 is exhausted by the exhaust device 60. Keep the temperature and humidity of the air stable.

1 illustrates the coating apparatus 10 having the air supply device 50 and the exhaust device 60, which are independent of each other. It is also possible to adopt a configuration in which air in the inner space of the cover wall 20 is connected to the opening (connected via the exhaust pipe 61 if necessary).
The air supply device 50 whose intake port is connected to the lower end opening of the side peripheral wall 21 of the cover wall 20 either directly or via the exhaust pipe 61 also serves as an exhaust device.

The upper filter 71 is provided extending in the lateral direction of the cover wall 20 at the upper end portion inside the side peripheral main wall portion 23 .
Inside the cover wall 20, a space above the upper filter 71, that is, a space between the upper filter 71 and the ceiling wall 22, is provided as an air supply chamber 20A.

The conditioned air supplied from the air supply device 50 to the inner space of the cover wall 20 is discharged from the air supply head 51 into the air supply chamber 20A.
The upper filter 71 has air permeability. The conditioned air in the air supply chamber 20A passes through the upper filter 71 and flows out from the upper filter 71 to the coating booth 20S below by continuing the supply of conditioned air from the air supply device 50 to the air supply chamber 20A. do. A downflow of conditioned air is supplied to the coating booth 20S from the air supply chamber 20A through the upper filter 71 .
The conditioned air flowing inside the cover wall 20 in FIG. 1 is denoted by A in the drawing.

The upper filter 71 removes fine dust such as dust from the conditioned air supplied from the air supply device 50 to the inner space of the cover wall 20 .
The upper filter 71 also serves to equalize the flow rate and velocity distribution of the conditioned air A from the air supply chamber 20A to the coating booth 20S in the lateral direction of the coating booth 20S.

When the paint sprayed from the spray gun 40 is sprayed onto the object T on the tray 30 in the painting booth 20S, the air supply device 50 continues to supply the conditioned air A to the air supply chamber 20A.
When the supply of the conditioned air A from the air supply device 50 to the air supply chamber 20A continues, the supply of the conditioned air A from the air supply chamber 20A to the coating booth 20S (downflow of the conditioned air A through the upper filter 71) supply) will also continue. Downflow conditioned air A continuously supplied from the air supply chamber 20A to the coating booth 20S through the upper filter 71 forms a laminar flow that flows downward from the upper filter 71 throughout the coating booth 20S.

Even if the upper filter 71 is not provided, the spray gun 40 and the tray 30 are located in the area in the vertical direction of the inner space of the cover wall 20 due to the arrangement and structure of the air supply outlet of the air supply head 51, for example. A configuration in which the upper filter 71 is omitted can also be adopted as long as it is possible to form a laminar flow that flows downward from above.
When the upper filter 71 is omitted from the coating apparatus 10 , the coating booth 20S refers to the space between the ceiling wall 22 and the lower filter 72 in the space inside the cover wall 20 .

The lower filter 72 has air permeability. The conditioned air A that flows downward from the upper filter 71 in the coating booth 20S and reaches the lower filter 72 passes through the lower filter 72, is sucked from the lower end of the side peripheral wall 21 to the exhaust device 60, and is exhausted from the exhaust device 60. .

The lower filter 72 catches the paint sprayed from the spray gun 40 that falls without adhering to the object to be coated T or the tray 30 .
The lower filter 72 prevents paint such as paint mist from flowing downward (downstream from the lower filter 72 in the flow direction of the conditioned air flow) from the lower filter 72 in the inner space of the cover wall 20, and the operation of the exhaust device 60 is prevented. Avoid being affected by inhaling paint dust.

As shown in FIG. 2, the present inventor prototyped a coating device 110 (comparative coating device) in which the position of the lower filter 72 was changed from the coating device 10 of FIG. and compared with the coating apparatus 10 of FIG.
The configuration of the coating apparatus 110 of FIG. 2 other than the position of the lower filter 72 is the same as that of the coating apparatus 10 of FIG.

2, the area between the upper filter 71 and the lower filter 72 inside the cover wall 20 is treated as a painting booth 110S.
The painting booth 110S of the comparative painting apparatus 110 of FIG. 2 does not have the tapered chamber S2. In the comparative coating apparatus 110 of FIG. 2, the distance from the workpiece T placed on the main plate 31 of the tray 30 to the lower filter 72 is shorter than that of the coating apparatus 10 of FIG.

In the comparative coating apparatus 110 of FIG. 2, when the paint sprayed from the spray gun 40 and falling downward from the tray 30 adheres to the upper surface of the lower filter 72, and the dried solidified paint P1 is present, the spray gun The paint dust P2 collided with the solidified paint P1 from 40 at high speed without colliding with the object T or the tray 30, and sometimes sprang up from the solidified paint P1 and adhered to the object T to be coated.
This is due to the air pressure discharged from the coating machine, and lowering the air pressure has an effect (adhesion of the paint dust P2, which bounces up after colliding with the solidified paint P1 at high speed, to the object T to be coated). ) can be reduced. However, in order to reproduce the coating conditions of the actual coating line in the coating apparatus 110, it is necessary to set the air pressure high.

In the coating apparatus 10 of FIG. 1, a tapered chamber S2 exists between the coating booth main chamber 20S1 and the lower filter 72. As shown in FIG. 1 can secure a larger distance from the upper surface of the tray main plate 31 to the lower filter 72 than the comparative coating apparatus 110 of FIG.
For this reason, in the coating apparatus 10 of FIG. 1, the paint dust P2 that collides with the solidified paint P1 on the upper surface of the lower filter 72 from above and bounces up does not easily reach the object T on the tray 30, and the solidified paint P1 It is possible to prevent the paint dust P2 splashed upward from adhering to the object T to be coated.

The tapered chamber portion 20S2 of the coating booth 20S of the coating apparatus 10 of FIG. 1 has a tapered shape in which the cross-sectional area in the horizontal direction decreases from the upper end toward the lower side.
In the region below the upper end of the tapered chamber portion 20S2, the flow velocity of the conditioned air that flows downward from the upper end of the coating booth 20S is faster than that in the main coating booth portion 20S1, and the flow speed of the conditioned air is higher than that in the main coating booth portion 20S1, and also downwards of the tapered chamber portion 20S2. The higher the velocity of the conditioned air flow, the higher the velocity.
Therefore, in the coating apparatus 10 of FIG. 1, it is possible to prevent the paint dust P2, which collides with the solidified paint P1 on the upper surface of the lower filter 72 from the spray gun 40 at high speed, from jumping upward from the solidified paint P1. As a result, in the coating apparatus 10 of FIG. 1, it is possible to reliably prevent the coating dust P2, which has sprung up from the solidified coating material P1, from adhering to the coating target T. uniformity of gender can be realized.

The coating apparatus 10 reciprocates the object to be coated while the paint is being sprayed from the spray gun, and reciprocates the object to be coated in a certain direction (overcoat movement direction) so that partial overcoating is sequentially performed. During the coating of the object to be coated, the object to be coated and the spray gun are shifted in the direction opposite to the moving direction of overcoating while the relative positions of the object to be coated and the spray gun are kept constant (halfway shift operation), A configuration is adopted in which a painting operation (hereinafter, also referred to as an intermediate shift painting operation) for restarting painting is performed.
For the halfway shift coating operation of the coating apparatus 10, the same coating operation as described in Patent Document 2, for example, can be adopted.

The painting operation restarted after the painting shift operation of the painting apparatus 10 is the same as the painting operation before the painting shift operation. That is, the coating operation restarted after the coating shift operation of the coating apparatus 10 is performed in a certain direction (overlapping) so that partial overcoating is sequentially performed while reciprocating the object to be coated while the coating is being sprayed from the spray gun. It is an operation to move in the painting movement direction).

The coating apparatus 10 that performs the midway shift coating operation can be made compact and space-saving by adopting a narrow cover wall 20. - 特許庁
Similarly to the coating apparatus 10 shown in FIG. 1, the comparative coating apparatus 110 shown in FIG.

However, the narrow cover wall 20 is required to reduce not only the circumferential dimension of the outer periphery of the side peripheral wall 21 but also the vertical dimension.
2 is structurally more difficult than the coating apparatus 10 shown in FIG.

2, when the cover wall 20 having the same size as that of the coating apparatus 10 of FIG. The separation distance between directions becomes shorter.
In the comparative coating apparatus 110 of FIG. 2, compared with the coating apparatus 10 of FIG. It tends to float near the upper surface. For this reason, in the comparative coating apparatus 110 of FIG. 2, the paint dust P2 that collides with the solidified paint P1 on the upper surface of the lower filter 72 from above and bounces up adheres to the upper surface of the object T on the tray 30. Cheap.

In the comparative coating apparatus 110 shown in FIG. 2, the paint dust P2 that collides with the solidified paint P1 on the upper surface of the lower filter 72 and bounces up from above moves between the inner peripheral surface of the side peripheral wall 21 of the cover wall 20 and the tray 30. It floats in the vicinity of the upper surface of the article to be coated T on the tray 30.
In a coating apparatus that has a low demand for compactness and space saving and that can employ a large-sized cover wall 20, a large distance can be secured from the upper surface of the object to be coated T on the tray 30 to the upper surface of the lower filter 72. Further, in this coating apparatus, there is sufficient space between the inner peripheral surface of the side peripheral wall 21 of the cover wall 20 and the tray 30 to spread the paint dust P2 that has collided with the solidified paint P1 on the upper surface of the lower filter 72 and bounced up over a wide range. It is possible to secure a dimensional separation distance. Therefore, it is easy to prevent the paint dust P2, which has collided with the solidified paint P1 on the upper surface of the lower filter 72 and jumped up, from floating in the vicinity of the upper surface of the article to be coated T on the tray 30. FIG.

On the other hand, in the painting apparatus 110 shown in FIG. 2, which employs a narrow cover wall 20 for compactness and space saving, due to the limitation of the dimensions of the painting booth 110S, the solidified paint P1 on the upper surface of the lower filter 72 collides and bounces up. Diffusion of the paint dust P2 is suppressed. As a result, the paint dust P2, which collided with the solidified paint P1 on the upper surface of the lower filter 72 from above and jumped up, passed between the inner peripheral surface of the side peripheral wall 21 of the cover wall 20 and the tray 30 and was supported by the tray 30. Paint dust P2 tends to reach the object T to be coated and float in the vicinity of the upper surface of the object T to be coated.

Compared to the comparative coating apparatus 110 shown in FIG. 2, the coating apparatus 10 shown in FIG. Between the booth main chamber 20S1 and the lower filter 72, there is provided a taper chamber 20S2 having a faster conditioned air flow rate than the painting booth main chamber 20S1.
For this reason, in the coating apparatus 10 of FIG. 1, even if the narrow cover wall 20 is adopted for compactness and space saving, the paint dust P2 which collides with the solidified paint P1 on the upper surface of the lower filter 72 from above and jumps up is can be prevented from reaching onto the substrate T supported by the tray 30 .
As a result, in the coating apparatus 10 of FIG. 1, even when the narrow cover wall 20 is employed, the paint dust P2 splashed upward from the solidified paint P1 can be prevented from adhering to the object T to be coated. It is possible to realize uniformity and stabilization of the hue, brightness, brightness and finish of the product.

(Second embodiment)
Next, a coating apparatus 10A of a second embodiment according to the invention will be described.
As shown in FIGS. 3 and 4, the coating apparatus 10A of this embodiment is the coating apparatus 10 of the first embodiment provided with a moving mechanism cover wall 82 housing the moving mechanism 81 of the object moving device 80. It has a schematic configuration.
The coating apparatus 10A of this embodiment will be described with the upper side as the upper side and the lower side as the lower side in FIG.
3 and 4, the same components as in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIGS. 3 and 4, the side peripheral main wall portion 23 of the cover wall 20 is formed with a long hole 26 extending in the peripheral direction thereof.
The object moving device 80 has a tray 30 , a support bar 83 passed through the long hole 26 of the cover wall 20 , and a moving mechanism 81 for moving the support bar 83 laterally with respect to the cover wall 20 .

As shown in FIG. 3 , the tray 30 is fixed to the tip of the support bar 83 located inside the cover wall 20 and supported on the tip of the support bar 83 .
The tray 30 of the device 80 for moving objects to be coated shown in FIG. ). Further, the tray 30 is provided on the support bar 83 so that the upper surface of the main plate 31 is positioned above the elongated hole 26 of the cover wall 20 .

The object moving device 80 is configured such that the upper surface of the tray main plate 31 is positioned above the elongated hole 26 of the cover wall 20, and the object to be coated T is separated above the elongated hole 26. It is not limited to the structure in which the tray 30 is fixed on the support legs 84 as long as it can be supported at any position.
The object moving device 80 is configured, for example, so that the upper surface of the main plate 31 of the tray 30 fixed to the tip of the support bar 83 is separated upward from the elongated hole 26 due to the thickness of the main plate 31 of the tray 30 itself. It is also possible to employ a configuration in which the upper surface of the tray main plate 31 is positioned apart from the elongated hole 26 by fixing the tray 30 to a support base fixed base protruding from the tip of the bar 83 .

The moving mechanism 81 shown in FIGS. 3 and 4 employs a biaxial actuator having a first actuator 85 and a second actuator 86. As shown in FIG.
The first actuator 85 moves the second actuator 86 parallel to the extending direction of the long hole 26 of the cover wall 20 (the X direction in FIG. 4).
As shown in FIGS. 3 and 4, the second actuator 86 has a moving head 86a arranged outside the cover wall 20 of the support bar 83 and fixed at its base end. The second actuator 86 moves the support bar 83 together with the moving head 86a in the Y direction (see FIGS. 3 and 4) perpendicular to the X direction in the lateral direction with respect to the cover wall 20 .

As shown in FIGS. 3 and 4, the elongated hole 26 of the cover wall 20 is formed in the side wall 21a of the side peripheral main wall portion 23 of the cover wall 20 located on the side opposite to the window hole forming side wall 21c.
The side wall 21c in which the long hole 26 is formed is hereinafter also referred to as the inner side wall 21e.
3 and 4, the Y direction is a direction perpendicular to the inner side wall 21e of the cover wall 20. In FIG.
Movement of the support bar 83 in the Y direction is movement in the inner and outer directions of the cover wall 20 with respect to the inner side wall 21e.

The moving mechanism 81 shown in FIGS. 3 and 4 can move the support bar 83 in the X direction and the Y direction by the first actuator 85 and the second actuator 86 .
Further, the moving mechanism 81 functions to move the support bar 83 and the tray 30 (substrate support base) together with the support bar 83 .
Hereinafter, the moving mechanism 81 is also referred to as a support base moving mechanism.

The second actuator 86 is a reciprocating device that reciprocates the support bar 83 and the tray 30 in the Y direction with a preset reciprocating stroke.
The coating apparatus 10A of FIGS. 3 and 4 performs a mid-shift coating operation.
In the midway shift coating operation performed by the coating apparatus 10A, the object to be coated T is reciprocated together with the tray 30 by the second actuator 86, and moved in the overcoating movement direction (X direction) by the first actuator 85, thereby coating the object to be coated. After performing the shift operation in the middle, painting is restarted.

In the midway shift operation, the object to be coated T and the spray gun 40 are shifted and moved in a direction opposite to the moving direction of overcoating while their relative positions are kept constant.
The midway shift operation is performed, for example, from the start of the midway shift coating operation, when the spray center P3 (see FIG. 4) of the spray gun 40 is at a preset position (shift operation start position) is reached.

As shown in FIGS. 3 and 4 , the moving mechanism cover wall 82 is attached to the rear side wall 21 e of the cover wall 20 to cover the long hole 26 .
The inner space of the moving mechanism cover wall 82 communicates with the painting booth 20S through the long hole 26 of the cover wall 20. As shown in FIG.

The coating apparatus 10A shown in FIGS. 3 and 4 includes a side air supply device 87 that supplies conditioned air whose temperature and humidity are adjusted to the inner space of the moving mechanism cover wall 82 . Supplying conditioned air from the side air supply device 87 to the inside of the moving mechanism cover wall 82 prevents paint dust from entering the inside of the moving mechanism cover wall 82 from the painting booth 20S through the long hole 26 .
The exhaust device 60 is provided with an exhaust capability capable of smoothly exhausting the conditioned air supplied from the air supply device 50 and the side air supply device 87, and the laminar flow of the conditioned air flowing downward in the coating booth 20S is ensured. keep the situation stable.

FIG. 5 shows a coating device 120 in contrast (second contrast) to the coating device 10A of the second embodiment.
In the comparative coating apparatus 120 of FIG. 5, the support position of the tray 30 by the tip of the support bar 83 of the object moving apparatus 80 is set to the long hole 26 of the cover wall 20 in the vertical direction in the coating apparatus 10A of the second embodiment. has changed to the same position as the formation of
5, the position of the lower filter 72 is positioned at the lower end of the coating booth main chamber 20S1 of the coating apparatus 10A of the second embodiment in accordance with the first comparison of FIG. The area between the upper filter 71 and the lower filter 72 on the inner side of the cover wall 20 is changed to the painting booth 120S.

In the comparative coating apparatus 120 of FIG. 5, the upper surface of the main plate 31 of the tray 30 is located within the projection range of the long hole 26 of the cover wall 20 in the Y direction. In FIG. 5, the object to be coated T (plate to be coated) supported on the tray main plate 31 is entirely positioned within the projection range of the long hole 26 of the cover wall 20 in the Y direction.

5, instead of supplying conditioned air to the inner side of the moving mechanism cover wall 82, air is supplied from the side air supply device 121 arranged outside the moving mechanism cover wall 82 to the moving mechanism. Air sucked from the outside of the moving mechanism cover wall 82 is supplied to the inside of the cover wall 82 .
Also, the pressure of the air supplied from the side air supply device 121 to the inside of the moving mechanism cover wall 82 is lower than the pressure of the conditioned air supplied from the air supply device 50 to the inside of the cover wall 20 .

In Patent Document 1, referring to FIG. 2 and the like, a coating object moving device is provided in a storage section provided adjacent to the coating booth, and the coating object moving device is a partition separating the coating booth and the storage section. A configuration is disclosed that includes a fixing jig that fixes an object to be coated via a space formed in the plate.
Referring to FIG. 2 and the like of Patent Document 1, the fixing jig supports the object to be coated at a position overlapping the space formed in the partition plate in the vertical direction.
Note that Patent Document 1 does not include a configuration for supplying air to the inside of the housing or for adjusting the air pressure inside the housing.

Referring to FIG. 2 of Patent Document 1, the space of the partition plate is formed in the shape of an elongated hole extending in the horizontal direction.
In order to prevent paint dust in the coating booth from entering the storage section through the space of the partition plate, the inventor of the present invention closed the space with the partition plate. In addition, it is considered to provide a bellows-shaped shutter that can be deformed to follow the movement of the fixing jig in the longitudinal direction of the space. The bellows-shaped shutter is configured to allow the fixing jig to slide relative to the bellows-shaped shutter in a direction perpendicular to the partition plate.

However, the bellows-shaped shutter becomes difficult to deform due to an increase in the amount of paint dust adhering to it due to repeated painting operations in the painting booth, which hinders movement of the fixing jig. In addition, when the bellows-shaped shutter is deformed by the movement of the fixing jig in the longitudinal direction of the space, the paint adhered to and solidified on the bellows-shaped shutter comes off and becomes a source of dust floating in the coating booth. .
The measure of providing a bellows-shaped shutter cannot stabilize the hue, brightness, brightness and finish of the painted object.

Therefore, the inventor of the present invention supplies air from the outside of the moving mechanism cover wall 82 to the inside of the moving mechanism cover wall 82 from the air supply device 121 as in the comparative coating apparatus 120 of FIG. A study was made to prevent paint dust inside from entering the inside of the moving mechanism cover wall 82 through the long hole 26 of the cover wall 20 .
However, in the preparation of a painted object using the comparative coating apparatus 120 of FIG. In some cases, there were differences in hue, brightness, glitter and finish. In addition, the temperature and humidity in the vicinity of the object to be coated T, which greatly affects the hue, brightness, brightness, and finish, may not be stable, especially when using a water-based paint.

As a result of verification by the present inventor, in the painting apparatus 120 of FIG. When it reaches the vicinity, the temperature and humidity in the vicinity of the object to be coated T become unstable, which causes the hue, brightness, brightness and finish of the painted object to be uneven at the beginning and end of the painting work. rice field.

Also, the replacement of the lower filter 72 is performed by replacing the lower filter 72 to which the solidified paint material P1 adheres with the lower filter 72 to which the solidified paint material P1 does not adhere. occurs. As a result, the amount of unconditioned air discharged from the inside of the moving mechanism cover wall 82 to the painting booth 120S through the long hole 26 of the cover wall 20 fluctuates. Fluctuations in temperature and humidity in the vicinity of the object to be coated T are caused, which causes non-uniformity in hue, brightness, brightness and finish of the object to be coated.

In the coating apparatus 10A of the embodiment shown in FIGS. 3 and 4, the upper surface of the main plate 31 of the tray 30 of the object moving device 80 is positioned upwardly away from the long hole 26 of the cover wall 20 so that the object to be coated An object T is supported at a position spaced upward from the long hole 26 . For this reason, the coating apparatus 10A discharges air (in this embodiment, Air-conditioning air) can be avoided from affecting the temperature and humidity in the vicinity of the upper surface of the article to be coated T placed on the tray 30 (referred to as "placed on the tray main plate 31" in this specification). As a result, in coating the object T to be coated using the coating apparatus 10A, the coating finish (hue, brightness, brightness and finish) of the object T to be coated can be made uniform and stabilized.

Further, in the coating apparatus 10A of the embodiment shown in FIGS. 3 and 4, conditioned air is supplied from the side air supply device 87 to the inside of the moving mechanism cover wall 82. As shown in FIG. Air-conditioned air inside the moving mechanism cover wall 82 is discharged from the elongated hole 26 of the cover wall 20 into the coating booth main room 20S1.
Therefore, the coating apparatus 10A maintains the temperature and humidity in the vicinity of the upper surface of the object to be coated T supported on the tray 30 more stably than in the case where unconditioned air instead of conditioned air is supplied to the inside of the moving mechanism cover wall 82. Therefore, uniformity and stabilization of the coating finish (hue, brightness, brightness, and finishing quality) of the object to be coated T can be achieved more reliably.

In the coating apparatus 10A, if unconditioned air instead of conditioned air is supplied to the inner side of the moving mechanism cover wall 82, depending on conditions such as the flow velocity of the conditioned air flowing downward in the coating booth main chamber 20S1 is slow. , part of the unconditioned air, which is diverted upward from the long hole 26 of the cover wall 20 by the operation of the object moving device 80, is affected by the temperature and humidity near the upper surface of the object T supported on the tray 30. May have a slight impact.
However, as in the coating apparatus 10A of the embodiment shown in FIGS. In addition, with a configuration in which conditioned air is supplied from the side air supply device 87 to the inner side of the moving mechanism cover wall 82, the temperature and humidity in the vicinity of the upper surface of the workpiece T supported by the tray 30 can be maintained stably. Uniformity and stabilization of the coating finish (hue, brightness, brightness and finish) of the object to be coated T can be realized more reliably.

Further, as in the coating apparatus 10A of the embodiment shown in FIG. 3 and FIG. In the supporting structure, the spraying of paint onto the upper surface of the object to be coated T and the drying and solidification of the coating film formed on the upper surface of the object to be coated T are affected by the conditioned air emitted from the long holes 26 of the cover wall 20. can avoid receiving This point also effectively contributes to the uniformity and stabilization of the finish (hue, brightness, brightness, and finish) of a coated object produced using the coating apparatus 10A of the embodiment shown in FIGS.

Although the present invention has been described above based on the best mode, the present invention is not limited to the above-described best mode, and various modifications are possible without departing from the gist of the present invention.

The coating apparatus according to the embodiment of the present invention is not limited to one that performs a midway shift coating operation.
For the coating apparatus of the embodiment according to the present invention, for example, one or both of the spray gun moving device and the object moving device may be omitted from the coating device of the first embodiment.

The tray 30 of the object moving device 80 is preferably detachable and replaceable with respect to the support bar 83 . The tray 30 replaceable with respect to the support bar 83 has ribs 32 capable of positioning the article to be coated T placed on the upper surface of the tray main plate 31 according to the outer dimensions of the article to be coated T. be able to.

The workpiece supporting table of the workpiece moving device 80 may be configured to support the workpiece T at a position spaced apart from the elongated hole 26 of the cover wall 20, and is not limited to a tray.
The object support table is, for example, configured to be formed in a flat plate shape forming an upper surface on which the object to be coated T is placed (object mounting surface), and to grip and release the object to be coated T. Configurations with switchable grippers, etc. can also be employed.
The object to be coated provided on the upper surface of the flat plate-shaped object support is supported by, for example, using an object holding tool (detachable type holding tool) that can be detached from the object support. Detachably fixed to the table. The detachable holder consists of a clip that can be attached to and detached from the work support base, a holding tape that can be adhesively attached to the top surface of the work support base, and a work support base made of a magnetic material (ferromagnetic material). A magnet (permanent magnet) that can be magnetically attracted to the magnet (adsorption presser) or the like can be adopted.
The plate-like workpiece supporting base can also adopt a configuration in which a workpiece holding tool (rotary pressing tool) that is rotatable with respect to the workpiece supporting table is provided.
A plate-like workpiece support base made of a magnetic material (ferromagnetic material) magnetically attracts the workpiece T made of a magnetic material (ferromagnetic material) by a magnet provided on the lower surface side opposite to the upper surface. It is also possible to adopt a configuration in which the holder can be held on the upper surface. Either a permanent magnet or an electromagnet can be used as the magnet arranged under the substrate support. When an electromagnet is used, a configuration is adopted in which magnetic attraction and attraction stop of the object to be coated T are switched by switching between the generation and stop of generation of the magnetic force of the electromagnet by switching on and off the energization of the electromagnet by the energization device. can.
The configuration in which the magnets are arranged under the support table for the object to be coated can also be adopted in the case of a tray. When the object support is a tray made of a magnetic material (ferromagnetic material), the electromagnet is arranged below the main plate of the tray.

For example, like the coating apparatus 10A of the second embodiment, it has an object moving device 80 that can support the object T to be coated by an object support base at a position spaced apart from the elongated hole 26 of the cover wall 20. The coating apparatus is not limited to a configuration having a side air supply device for supplying conditioned air to the inside of the moving mechanism cover wall 82 . For example, it should be noted that unconditioned air inside the moving mechanism cover wall 82 emitted through the long hole 26 of the cover wall 20 by the conditioned air flow descending in the coating booth affects the temperature and humidity around the object to be coated. If it can be avoided, a configuration having a side air supply device for supplying unconditioned air to the inside of the moving mechanism cover wall 82 can also be adopted.

The side peripheral main wall portion 23 of the cover wall 20 is not limited to a rectangular tubular shape, and may be, for example, a polygonal tubular shape such as a pentagonal tubular shape, a hexagonal tubular shape, an octagonal tubular shape, or a cylindrical shape.
The coating apparatus according to the embodiment of the present invention is not limited to the preparation of a coated plate for coating a plate to be coated, but can be applied to the preparation of various objects to be coated by coating objects other than the plate to be coated.

DESCRIPTION OF SYMBOLS 10, 10A... Coating preparation apparatus, 20... Cover wall, 20A... Air supply chamber, 20S... Painting booth, 20S1... Main chamber part, 20S2... Taper chamber part, 21... Side peripheral wall, 21a... Side wall, 21b... Window Hole 21c... Window hole forming side wall 21d... Opening/closing door 21e... Deep side side wall 22... Ceiling wall 23... Side peripheral main wall portion 24... Tapered tubular wall 25... Outlet tubular wall 26... Long hole 30... Object support (tray) 31 Main plate 32 Rib 40 Spray gun 50 Air supply device 51 Air supply head 52 Air supply pipe 60 Exhaust device 61 Piping 71 Upper filter 72 Lower filter 80 Object moving device 81 Moving mechanism (support table moving mechanism) 82 Moving mechanism cover wall 83 Support bar 84 Support leg 85 First actuator , 86 Second actuator 86a Moving head 87 Side air supply device 110 Painting device 110S Painting booth 120 Painting device 120S Painting booth 121 Air supply device A Conditioned air , P1... Solidified paint material, P2... Paint dust, P3... Spray center, T... Object to be coated.

Claims (4)

a cover wall having a cylindrical side peripheral wall extending in the vertical direction and having a coating booth in which an object to be coated is carried inside the side peripheral wall;
an object-to-be-coated support base for supporting the object to be coated accommodated in the coating booth;
a spray gun for spraying paint from above the object to be coated, which is provided in the painting booth and supported on the object support base, toward the object to be coated;
an air supply device that supplies air to the inner side of the cover wall from a position above the spray gun on the cover wall;
an exhaust device for exhausting air inside the cover wall from a lower end opening of the side peripheral wall of the cover wall;
a lower filter that closes a position below the workpiece support on the inner side of the side peripheral wall,
The side peripheral wall of the cover wall includes a cylindrical side peripheral main wall portion forming an inner space extending vertically with a constant cross section, and a tapered tube extending downward from the lower end of the side peripheral main wall portion in a tapered shape. Consists of a wall and an outlet cylindrical wall extending downward from the lower end of the tapered cylindrical wall with a constant cross section,
The lower filter is a filter that closes the outlet tube wall inside the side peripheral wall, and the member that first closes a position below the workpiece support on the inside of the side peripheral wall is the lower filter,
The painting booth is composed of a main chamber that is an inner space of the side peripheral main wall and a space that extends from the main chamber to the lower filter,
A coating apparatus in which the workpiece support table supports the workpiece within the main chamber of the coating booth. A support bar passed through an elongated hole extending in the circumferential direction of the side peripheral wall surrounding the coating booth, and the article to be coated fixed to the tip portion of the support bar located inside the cover wall. a device for moving an object to be coated, comprising: a support table;
a moving mechanism cover wall that accommodates the moving mechanism of the device for moving the object to be coated;
the inner space of the moving mechanism cover wall communicates with the painting booth through the long hole,
2. A coating apparatus according to claim 1, wherein said object support base supports said object to be coated at a position spaced above said long hole of said side peripheral wall. 3. The coating apparatus according to claim 2, further comprising a side air supply device for supplying temperature- and humidity-controlled conditioned air to the inside of said moving mechanism cover wall. 4. The coating apparatus according to any one of claims 1 to 3, further comprising a spray gun moving device for moving said spray gun.

Images