JP2001300371A - Coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating booth having a relatively simple structure, being not noisy and capable of excellently collecting coating mist sprayed and released from a spray coating gun to prevent the adverse effect on the coated surface of a material to be coated and the deterioration of an ambient environment. SOLUTION: The coating booth is provided with a booth main body 1 having an opening part in the front, an exhaust blower 11 for sucking air in the booth main body 1 and a filter 9 and the coating is performed by spraying a coating material from the spray coating gun 15 toward the material to be coated, which is arranged in the booth main body 1. A cylindrical curved surface frame part 3 with the front face having a cylindrical swelled curved surface is provided in the front peripheral part of the hood part 2 provided in the front part of the booth main body 1 and the inside of the cylindrical swelled curved surface of the cylindrical curved frame part 3 is continuously formed on the inside wall surface of the hood part 2 smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents spraying of paint mist by spraying by placing the work in a booth when coating the work such as various industrial products using a spray coating gun. About a painting booth.

[0002]

2. Description of the Related Art A dry baffle type painting booth is generally known as this type of painting booth. This baffle-type painting booth, as shown in FIGS.
A baffle plate 31 as a first filter is erected in the interior of the box-shaped booth main body 30, and a second filter 33 is provided behind the baffle plate 31. An exhaust chamber 34 is formed behind the second filter 33.

Further, an exhaust blower 3 is provided above the exhaust chamber 34.
5 is attached, and by the exhaust operation of the exhaust blower 35,
The air in the booth main body 30 is exhausted through the exhaust chamber 34, the baffle plate 31, and the second filter 33. The workpiece W to be painted is placed in the booth main body 30 having an open front, a spray painting gun 36 is placed in front of the body W, and paint is sprayed from the spray painting gun 36 to perform painting. Mist sprayed from the spray coating gun 36 and radiated into the booth body 30 (unnecessary paint that does not adhere to the object to be coated)
Is sucked through the baffle plate (first filter) 31 and the second filter 33 to collect the coating mist and prevent the coating mist from scattering.

[0004]

However, in this type of conventional baffle-type painting booth, a baffle plate 31 is erected at a relatively close position in the booth where the workpiece W is arranged.
In order to suck the air in the booth through the baffle plate 31 (first filter) and the second filter 33 having a large area, the paint is sprayed into the booth by the spray coating gun from the front toward the work W in the booth. 9 and FIG. 1
As shown at 0, the spray gas hits the baffle plate, causing air to rewind at the front surface of the baffle plate 31 or the dried paint adhered to the baffle plate 31 to be peeled off and wound up by the rewind airflow. For this reason, the unnecessary paint that has not adhered to the object to be coated re-adheres to the surface of the object to be coated W due to the rewinding airflow, thereby deteriorating the coating quality or causing the dust of the dry paint to be blown up to cause the object to be coated W to be coated. There was a problem that it adhered to the surface and caused poor coating.

[0005] Further, since the front edge of the booth main body of this type of conventional coating booth is formed in the shape of a cut end of a plate, an airflow flowing into the booth from the outside flows off the wall surface. For this reason, the air flow separated at the peripheral edge in the booth main body is contracted, and the flow rate and the flow velocity of the air flow flowing around the object to be coated are increased.

[0006] When a paint is sprayed onto a workpiece from a spray paint gun, the flow velocity of the airflow flowing around the paint is naturally as small as possible, while the adhesion of the spray paint is good. As described above, in the conventional baffle-type painting booth, the airflow flows so as to gather in the center, and the flow rate and the flow velocity of the airflow flowing around the object to be coated increase, so that the adhesion of the spray paint deteriorates. was there. Therefore, the operation is performed by reducing the rotation speed (exhaust flow velocity) of the exhaust blower as much as possible. However, in this case, the dispersed paint mist is difficult to be sucked and captured by the filter, and as a result, the paint mist stays in the booth. There has been a problem that it scatters around or falls to the floor, thereby deteriorating the surrounding working environment.

[0007] Further, since the air flow is wrapped around in the booth main body, paint dust adhering to the front surface of the baffle plate 31 and dried and peeled off, and paint dust dropped on the floor or the like and dried, are removed from the air. There is a problem in that the film is sowed up by rewinding and adheres to an object to be coated, thereby deteriorating the coated surface and causing defective coating.

On the other hand, a Venturi booth and an oil circulation booth are known as other conventional painting booths. The former booth is provided with a swirl chamber, and the exhaust swirl is generated in the swirl chamber. The structure is such that the air and the coating mist are separated by the swirl, and the separated coating mist is collected in the water tank. However, there is a problem that a loud noise is generated when the swirl is generated. Further, the latter oil-circulating booth requires a device for sending oil to the upper part, which complicates the structure and increases the manufacturing cost.
There was a problem that oil management was difficult, and maintenance and inspection required much labor and cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a relatively simple structure, low noise, and excellently collects a coating mist sprayed and radiated from a spray coating gun to form an object to be coated. It is an object of the present invention to provide a painting booth capable of preventing adverse effects on painted surfaces.

[0010]

To achieve the above object, a coating booth according to the present invention comprises a booth body having an opening at the front, an exhaust blower for sucking and exhausting air from the booth body, and a booth. A filter disposed between the main body and the exhaust blower, and in a coating booth for performing coating by spraying paint from a spray coating gun toward an object to be coated disposed in the booth main body, At the front edge of the hood portion provided at the front portion, a cylindrical curved frame portion having a front surface having a cylindrical bulging surface is provided, and the inside of the cylindrical bulging curved surface of the cylindrical curved frame portion is an inner wall surface of the hood portion. It is characterized by being formed smoothly and continuously.

Here, a tray portion communicating with the hood portion is provided below the hood portion, and a mist adhering material for adhering and catching paint mist or the like contained in exhaust gas can be accommodated in the tray portion. In addition, by projecting a protruding portion toward the inside of the tray portion at the rear lower end portion of the hood portion, a contraction portion can be provided in a ventilation path of the airflow toward the filter. Further, in the above configuration, the front surface of the protruding portion is formed with a gently bulging curved surface toward the lower end portion, and the inside of the cylindrical curved frame portion located on the upper side of the opening of the booth main body is above the hood portion. While gently continuing to the upper end of the rear wall,
The lower end of the upper rear wall portion can be formed so as to smoothly continue to the bulging curved surface of the protruding portion.

[0012]

In the coating booth having such a configuration, the object to be coated is placed in the booth body, and the object to be coated in the booth body is sprayed from the front with a spray coating gun to perform the painting. By operating the blower, the air in the booth body is exhausted through the filter. At this time, the airflow that enters the booth body from the opening at the front of the hood section smoothly flows in along the bulging cylindrical curved surface on the front surface of the cylindrical curved frame section, and thus flows along the inner wall of the booth body. The flow of air flows well without being separated, and an external air flow uniformly flows into the booth body from the entire opening of the hood.

Therefore, since the air flow does not concentrate around the object to be coated in the central portion, the air flow stays at the peripheral portion in the booth main body, and the air does not rewind, the coating to be performed as in the prior art is not performed. Unnecessary paint mist that has passed without adhering to the object can be satisfactorily applied without being re-adhered to the object by the rewinding airflow. In addition, since the air flow in the booth main body smoothly flows through both the central portion and the peripheral portion and is exhausted, it is not necessary to increase the air flow speed (rotational speed of the exhaust blower) so much, and it can be kept low. It is possible to prevent dust and the like from getting outside into the booth room, thereby preventing dust from adhering to the object to be coated.

Further, a tray portion communicating with the hood portion is provided below the hood portion, and a mist adhering material for adhering and catching paint mist or the like contained in exhaust gas is accommodated in the tray portion. The paint mist can be efficiently captured. Also, by forming a protruding portion at the rear lower end of the hood portion toward the inside of the tray portion to provide a contraction portion in a ventilation path of the airflow toward the filter, the spray gas sprayed from the spray paint gun can be provided. Does not directly hit the filter surface, preventing the dry paint adhering to the filter surface from being peeled off and wound up by the spray airflow from the spray paint gun as in the past, and preventing coating defects such as sticking to the object to be coated. be able to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of the painting booth, FIG. 2 is a sectional view taken along line II-II, and FIG. 3 is a sectional view taken along line III-III. Reference numeral 1 denotes a booth main body of a painting booth, which is basically configured such that a hood portion 2 having an open front surface is communicated with and disposed inside the tray portion 5 on a tray portion 5 placed on the floor or the like. You. A booth room 4 is formed in the hood 2 and the tray 5.

The tray section 5 is formed in a rectangular, shallow container shape with an upper opening, and is horizontally mounted on a gantry 12, as shown in FIG. The rear wall of the tray 5 is formed low to connect the connection duct 10 connected to the exhaust blower 11, and the upper side is open. Front wall part 5 of tray part 5
a is formed by a curved surface bulging forward. Hood part 2
As shown in the exploded perspective view of FIG. 4, the front surface has an opening 2a which opens diagonally upward, and an upper rear wall 2b having a bulging curved surface is provided from the upper surface to the rear surface of the opening 2a. A substantially triangular side wall 2c is provided on both sides of the opening 2a.

A projecting portion 7 for forming a contraction portion 6 in the ventilation passage is formed at a lower portion of the upper rear wall portion 2b with a front surface having a gentle bulging curved surface. As shown in FIGS. 3 and 7, the section from the upper rear wall portion 2b to the projecting portion 7 therebelow is formed so as to have a gentle S-shaped cross section, whereby the airflow in the exhaust direction is reduced. It flows smoothly and well.

Further, a cylindrical curved frame portion 3 having a curved surface bulging forward is formed around the opening 2a on the front surface of the hood portion 2 (four sides). The cylindrical curved frame portion 3 having a bulging cylindrical curved surface on the front surface is provided on the upper rear wall portion 2 of the hood portion 2.
b and the front edges of the side walls 2c on both sides are formed by bending outwardly into a cylindrical shape, and the lower edge of the opening 2a is provided with a cylindrical curved lower frame having a cylindrical curved surface. Opening 2a
The cylindrical curved frame portion 3 on the upper side is smoothly integrated with the upper end of the upper rear wall portion 2b, and the cylindrical curved frame portions 3 on both the left and right sides of the opening 2a are smoothly integrated with the tip of the side wall portion 2c. .
The cylindrical curved frame 3 on the lower side of the opening 2 a is smoothly connected to the front wall 5 a of the tray 5. The cylindrical curved frame portions 3 provided on the four sides around the opening 2a are continuously formed around the opening 2a, and the cross section of the cylindrical curved frame portion 3 is shown in FIG. Thus, it has a substantially semicircular arc-shaped cross section.

The hood portion 2 is detachably attached so as to cover the tray portion 5, and the protrusion 7 projecting from the rear lower portion of the hood portion 2 enters the tray portion 5.
When the protruding portion 7 enters the tray portion 5, as shown in FIG. 3, a contraction portion 6 for narrowing an air passage in the tray portion 5 is formed below the protruding portion 7. A horn-type connection duct 10 is connected to a rear portion of the tray section 5 through a filter 9, and an intake side of an exhaust blower 11 is connected to a base of the connection duct 10. As the filter 9, a replaceable paper filter or sponge filter can be used. The exhaust blower 11 is driven by a motor 13, and an exhaust duct is connected to the exhaust side of the exhaust blower 11.

A mist adhering material 8 for adhering and catching paint mist and dust from the airflow passing therethrough is accommodated in the tray section 5. As the mist adhering material 8, a sponge impregnated with a liquid such as oil or water can be used, and only the liquid may be accumulated on the bottom of the tray unit 5.

When performing the coating, as shown in FIG. 7, the mounting table 14 is placed in the booth room 4 and the object W to be coated is placed on the mounting table 14.
Is placed, the spray coating gun 15 is positioned in front of the opening 2a on the front surface of the hood portion 2, and the exhaust blower 11 is operated to spray paint from the spray coating gun 15 onto the workpiece W.

When the exhaust blower 11 operates, the air in the booth main body 1 is sucked from the contraction section 6 to the exhaust blower 11 through the connection duct. At this time, as shown in FIG. 6, the outside air is sucked into the booth room 4 from the opening 2a of the hood portion 2. At this time, the outside air near the four sides of the opening 2a flows into the opening 2a. The entering air flow smoothly flows in along the bulging cylindrical curved surface on the front surface of the cylindrical curved frame 3 on the four sides. For this reason, the airflow that enters the booth chamber 4 from the opening 2a flows relatively uniformly without stagnation at both the central portion and the peripheral portion as shown in FIG. 8, and as shown in FIG. The airflow does not separate from the side wall surface or the upper wall surface and collect at the central portion to flow.

For this purpose, when the spray coating gun 15 is positioned obliquely above the workpiece W and the paint is sprayed toward the workpiece W in the forward and downward direction, the paint is favorably directed toward the workpiece W. Flows and adheres there. Unnecessary paint mist that has passed without adhering to the object to be coated W travels through the smoothly flowing air flow, without re-adhering to the object to be coated W, proceeds from the contraction section 6 to the filter 9 and passes through the filter 9. Paint mist is satisfactorily collected from the air flow passing through the
Exhausted through 1.

At this time, since the exhaust gas is restricted by the contraction portion 6, the flow velocity of the exhaust gas flowing in the vicinity of the object to be coated W in the booth chamber 4 is suppressed. Good airflow without rewinding. Therefore, it is possible to prevent a coating defect in which unnecessary paint mist that has passed without attaching to the work W as in the related art is reattached to the work by the rewinding airflow.

Further, the air flow in the booth room 4 is at the center,
Since the peripheral edge portion flows smoothly and is exhausted, the air flow velocity (the rotation speed of the exhaust blower) does not need to be so high and can be kept low. Is prevented from adhering to the object W to be coated.

As shown in FIG. 7, a filter 9 for trapping paint mist from exhaust gas is supplied from the booth chamber 4 to the contraction section 6.
Is located at a distance from the spray paint gun 1
The spray gas sprayed from 5 does not directly hit the surface of the filter 9, but prevents the dry paint adhered to the surface of the filter from being peeled off and rolled up as in the prior art, thereby preventing coating defects such as sticking to the object to be coated. be able to.

In the above embodiment, the exhaust blower 11 is provided behind the rear end of the tray 5 via the connection duct, but the connection duct is connected above the rear end of the tray 5. If the exhaust blower 11 is connected and arranged thereon, the installation space of the painting booth can be reduced.

[0028]

As described above, according to the coating booth of the present invention, air flows smoothly without stagnation or rewinding of air at the periphery of the booth room. Unnecessary paint mist that has passed through without being applied can be prevented from being defective in coating, such as being re-adhered to an object to be coated by a rewinding airflow. In addition, the airflow in the booth room flows smoothly at both the center and the periphery, and is exhausted.
It is not necessary to make the air flow velocity (rotational speed of the exhaust blower) so high, and it can be kept low, so that dust and the like outside on the floor and the like can be prevented from getting into the booth room, and the adhesion of dust to the workpiece can be prevented. can do.

[Brief description of the drawings]

FIG. 1 is a plan view of a painting booth showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an exploded perspective view of a painting booth.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 4;

FIG. 6 is an explanatory perspective view showing a flow of an exhaust air flow.

FIG. 7 is an explanatory vertical sectional view showing a flow of an exhaust air flow.

FIG. 8 is an explanatory cross-sectional view showing a flow of an exhaust air flow.

FIG. 9 is a longitudinal sectional view showing a flow of an exhaust airflow of a conventional coating booth.

FIG. 10 is a cross-sectional view showing a flow of an exhaust airflow of a conventional painting booth.

[Explanation of symbols]

 1-Booth body 2-Hood 2 a-Opening 2 b-Upper rear wall 3-Cylindrical curved frame 4-Booth room 5-Tray 6-Leakage 7-Projection 8-Mist adhering material 9-Filter 11-Exhaust blower

Claims (4)

[Claims] 1. A booth main body having an opening at a front surface, an exhaust blower for sucking and exhausting air in the booth main body,
A filter disposed between the booth main body and the exhaust blower, and a coating booth for performing coating by spraying paint from a spray coating gun toward an object to be coated arranged in the booth main body, On the front edge of the hood provided at the front of the booth body,
A cylindrical curved frame portion having a front surface having a cylindrical bulging surface is provided, and the inside of the cylindrical bulging curved surface of the cylindrical curved frame portion is formed smoothly and continuously on the inner wall surface of the hood portion. A painting booth characterized by: 2. A tray unit communicating with the hood unit is provided below the hood unit, and a mist adhering material for adhering and catching paint mist or the like contained in exhaust gas is accommodated in the tray unit. The coating booth according to claim 1, characterized in that: 3. A contraction section is provided in a ventilation path of an air flow toward the filter by protruding a projection toward the inside of the tray section at a rear lower end of the hood section. The coating booth according to claim 1, wherein 4. A front surface of the projecting portion is formed with a gently bulging curved surface toward a lower end portion thereof, and an inside of a cylindrical curved frame portion located on an upper side of an opening of the booth main body is located above the hood portion. 4. The coating booth according to claim 3, wherein the lower end of the upper rear wall is formed so as to be smoothly continuous with the upper end of the rear wall, and the lower end of the upper rear wall is formed smoothly and continuously with the bulging curved surface of the projection.