JP2000288442A - Device for supplying ionized air for coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and highly practical device for supplying ionized air for coating booth, which is improved in dust removing effect by forming a high concentration ionized air atmosphere in the coating booth and remarkably enhanced in the quality of a coated surface by effectively blowing the high concentration ionized air to a work to be coated. SOLUTION: The device 1 for supplying the ionized air for coating booth has an air supply duct 3 for supplying air into the coating booth 2. An air fan 4 and an ionizer 5 are provided at prescribed positions of the air supply duct 3. When air is passed through the air supply duct 3, a prescribed range of an air passage is irradiated with soft X-ray from the ionizer 5 to ionize air to be supplied to the coating booth 2. A flexible hose for blowing the ionized air to the surface to be coated at the dust removing position and the coating position of the work W to be coated is preferably provided in the downstream part of the air supply duct 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ionizing air supply device for a coating booth, and is applied to a coating booth used for spray coating of automobile parts, home electric appliances, building materials, and the like.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a coating booth in which ionized air is introduced into a work space for spray coating, and dust and static electricity on a surface to be coated are removed in an atmosphere of the ionized air (Japanese Patent Application Laid-Open No. Hei 9 (1999)). -276755, JP-A-11-3
No. 1575). This type of coating booth is provided with an ionized air supply device using a forced air supply duct, and a corona discharge electrode is attached to a ceiling outlet of the supply duct or the like. During coating, particles in the air passing through the air supply passage are ionized by corona discharge, and the ionized air generated by this is blown into the coating booth.

[0003]

However, such a conventional ionized air supply device has the following problems when it is put to practical use. Since the amount of ions generated by corona discharge is small, a sufficient amount of ionized air is not distributed in the coating booth, and a sufficient dust removing effect cannot be obtained. Since high voltage is applied to particles in the air to generate ionized air, safety measures against electric shock and explosion are required, and harmful by-products such as ozone and nitrogen oxides are generated in large quantities. Since the effective distance in which the ionized air is kept in an ionized state is short, and it is necessary to provide an electrode outside the coating booth for safety measures, the design and construction of discharge electrodes and ducts for blow air becomes complicated. .

Accordingly, the present invention has been made in view of such a situation, and the dust removing effect is improved by forming an atmosphere of high-concentration ionized air in a coating booth, and a high-concentration ionization is applied to a product to be coated. It is an object of the present invention to provide a safe and practical ionizing air supply device for a painting booth in which the quality of a painted surface is greatly improved by efficiently blowing air.

[0005]

According to the present invention, there is provided an ionizing air supply apparatus for a coating booth according to the present invention, comprising: a coating booth forming a work space for coating; Air duct, blowing means for feeding air into an air supply passage of the air supply duct, ionized air generating means for irradiating soft X-rays to a predetermined range of the air supply passage, and ionizing air supplied to the coating booth; The configuration was provided with.

It is preferable that a blow air duct for blowing ionized air to the article to be coated be provided downstream of the air supply duct. The blow air duct may include a first duct provided toward a dust removal position of the article to be coated, and a second duct provided toward a coating position of the article to be coated.

According to the ionizing air supply device for a painting booth of the present invention, the air in the air supply duct is ionized by soft X-ray irradiation, so that a large amount of ionized air is generated in a short time in the soft X-ray irradiation area. This makes it possible to create an atmosphere of highly-concentrated ionized air in the painting booth. Further, since it is not necessary to apply a high voltage when generating ionized air, harmful by-products such as ozone are generated, and electric shock and explosion are avoided. Furthermore, since there are few restrictions on safety measures in the painting booth and the effective distance of ionized air is long, it is possible to form a blow air duct with a relatively simple configuration and efficiently cover high concentration ionized air. Can be sprayed on painted products.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the configuration of an ionized air supply device for a painting booth according to a first embodiment of the present invention. As shown in FIG. 1, in the ionized air supply device 1, an air supply duct 3 is provided outside a painting booth 2. A blower fan 4 that blows air into the coating booth 2 is provided at an outside air inlet of the air supply duct 3. An ionizer 5 is attached to a predetermined position of the air supply passage. When the blower fan 4 and the ionizer 5 are operated, ionized air generated in the air supply duct 3 is blown into the coating booth 2 from the outlet 2a.

An exhaust duct 9 is provided on the painting booth 2 on the side opposite to the air supply duct 3. The air in the painting booth 2 is sent out of the room through an exhaust duct 9 from an exhaust port 9a as shown by an arrow in FIG.

[0010] In the coating booth 2, a conveyor 7 for transporting the workpiece W is provided. The conveyor 7 moves the workpiece W along a predetermined transport path from the entrance to the exit of the coating booth 2. The conveyor 7 is provided with a dust removing position for removing dust from the workpiece W before painting and a painting position for painting the workpiece W after dust removal in accordance with the route in which the workpiece W is transported. That is, the article W to be coated placed on the conveyor 7
After the surface to be coated is dust-removed at the dust-removing position, it is immediately sent to the painting position and spray-painted.

A branch duct 1 is provided downstream of the air supply duct 3.
0 is provided. As shown in FIG.
Numeral 0 extends along the ceiling of the painting booth 2, and flexible hoses 11a and 11b are connected to the tip of the branch duct 10. The outlet of the flexible hose 11a is directed to the dust removal position of the article W to be coated, and the outlet of the flexible hose 11b is directed to the coating position of the article W to be coated.

The distance between each of the outlets of the flexible hoses 11a and 11b and the article W to be coated is different. This is because the amount of air flow is varied depending on the purpose of blow air from each hose. That is, at the time of dust removal, relatively strong ionized air is blown onto the surface to be coated by the flexible hose 11a,
Improves static elimination and dust removal effects. On the other hand, at the time of coating, relatively weak ionized air is sprayed onto the coated surface and the coating particles by the flexible hose 11b so that the coating film does not become uneven.

As shown in FIG. 2, between the dust removing position and the coating position of the article to be coated W, a partition wall 1 for partitioning these spaces is provided.
2 are provided. The partition 12 is a flexible hose 11
The blow airs a and 11b serve to prevent dust and the like from scattering into each other's space.

At the entrance of the branch duct 10, a damper 15 is provided.
Is provided. The amount of blown air is adjusted by opening and closing the damper 15. For example, when the surface to be coated of the workpiece W is wide, the damper 15 is fully opened to increase the amount of blow air, and when the surface to be coated is relatively small, the opening of the damper 15 is reduced to reduce the blow air. Reduce the amount. When blow air is not required, the damper 15 is fully closed.

As shown in FIGS. 3 and 4, the ionizer 5 is provided with a soft X-ray irradiation port 21 in a box-shaped case 20. A fixing piece 22 such as a bolt that can be fitted is provided at an end of the case 20. The fixing piece 22 allows the case 2
When 0 is fixed to the outer surface of the air supply duct 3, the soft X-ray irradiation port 21 faces the air supply passage.

As shown in FIG. 4, an oil chamber S is provided inside the case 20, and an electronic tube 24 and a power supply 25 are housed in the oil chamber S. A cooling fan 26 that suppresses an increase in the internal temperature of the case 20 is attached to a side surface of the case 20. The soft X-ray irradiation port 21 is provided with a window material made of beryllium. The irradiation light from the electron tube 24 is converted into light in the soft X-ray region when passing through the window material. In the soft X-ray irradiation region, ionization of air occurs, and the same amount of positive ions and negative ions is generated.

Next, a method of using the ionized air supply device 1 will be described. When dust is removed from the air in the coating booth 2, the air passing through the air supply duct 3 is irradiated with soft X-rays by the ionizer 5 to be ionized. At this time, a large amount of ionized air is generated in the soft X-ray irradiation area and sent to the coating booth 2. Then, in the painting booth 2, the entire work space R is filled with ionized air due to the flow of air generated in the room and the electric repulsion between ions. Then, as shown in FIG. 5, the dust D in the working space R is charged and electrically attracted to each other to increase the size of the particles, and the particles fall or are discharged. As a result, the floating amount of dust in the work space R decreases. For example, even if dust enters the painting booth 2 from the entrance for carrying in the article to be coated W or the like, the dust is removed by such a dust removing action.

At the time of coating, when the damper 15 of the branch duct 10 is opened, ionized air is directly blown onto the workpiece W from the flexible hoses 11a and 11b. At this time, the distance from the ionizer 5 to the outlet of each hose is relatively long, but the amount of ionized air generated from the ionizer 5 is large, and the ionization state is maintained for a long time. Ionized air is blown out.

As described above, according to the ionizing air supply device 1 for a painting booth, an atmosphere of high concentration ionized air can be formed in the painting booth, and dust in the booth can be efficiently removed. In addition, since high concentration ionized air can be effectively blown onto the workpiece,
Useful for improving the quality of painted surfaces. Further, when ionized air is generated, generation of harmful gas such as ozone is avoided, so that safety in the coating booth is also improved.

Next, the ionized air supply device of the present invention is used.
The example which tested about the dust removal effect of the painting booth which was done is shown.
In the test, a paint booth as shown in Fig.
Set a point and blow ionized air into the booth for a predetermined time
And the amount of dust was measured. The ionizer blows out the air supply section
It was attached at a position about 2 m away from the mouth. For measuring dust
Is a high sensitivity digital dust meter manufactured by Nippon Kagaku Kogyo Co., Ltd.
KANOMAX MODEL 3241 "was used.
The measurement conditions are as follows. Indoor volume: 93.5m^Three  Room temperature: 20.4 Air supply: 600 m^Three / H Height of measurement point: 1 m As a comparative example, without operating the ionizer,
The same applies to the amount of dust when normal air is introduced.
Measured. FIG. 7 shows the results.

As shown in FIG. 7, after 30 minutes from the start of the test, the dust was reduced to about 70% when using normal air, whereas the dust was reduced to 40% when ionized air was introduced. Decreased to below. This is presumably because the dust concentration in the coating booth was significantly enhanced by the high concentration of ionized air. In addition, in the case of the conventional corona discharge, considering that the dust was reduced to only about 60% in the investigation by the inventors, according to the present invention, the dust removing effect is extremely higher than that of the conventional device. I understand.

Next, a second embodiment of the present invention is shown in FIGS. The ionized air supply device 30 of the second embodiment includes:
The ionized air is supplied to a simple coating booth 32 without a forced air supply duct. Painting booth 3
An air supply box 33 is attached to the outer side of the second. At the upper part of the air supply box 33, two air supply hoses 34a, 34b extend along the outer wall surface of the painting booth 32. Each of the air supply hoses 34a and 34b is introduced into the booth from the ceiling or the opening of the coating booth 32, and is installed toward the dust removing position and the coating position of the article W to be coated.

In the air supply box 33, a blower fan 36 is provided.
Is attached. When the blower fan 36 is operated, outside air is sucked from below the air supply box 33 and blown into the painting booth 32 through the air supply hoses 34a and 34b.

An ionizer 37 is provided outside the air supply box 33. The soft X-ray irradiation port of the ionizer 37 is
It is directed to the air supply passage in the box. Air supply box 33
When air passes through the inside, ionized air is generated in the irradiation area of the soft X-rays and is sent to the coating booth 32.

As described above, by using the unit-type ionized air supply device 30, even a painting booth having no existing air supply duct or the like can efficiently perform high-concentration ionization by relatively simple work. Air can be supplied.

FIG. 10 shows a third embodiment of the present invention. Third
The ionizing air supply device 40 according to the embodiment includes a coating robot 4
The ionizing air is introduced into the coating booth 42 through the third spray nozzle 44. Coating spray nozzle 4
4 is supplied with a predetermined amount of paint and compressed air from a paint tank 45 and an air tank 46, respectively. The air tank 46 is provided with an ionizer therein, and ionizes the factory air (compressed air) flowing through the air supply duct 47. When the article W to be conveyed to the conveyor reaches the painting position, the painting robot 43 sprays the paint from the spray nozzle 44 onto the ionized air. The ionized air neutralizes the static electricity of the paint and effectively removes dust from the surface to be painted. Also, when the ionizing air fills the painting booth 42, the dust in the entire booth is reduced.

According to the third embodiment, high-concentration ionized air can be supplied into the coating booth by using the spray nozzle 44 of the coating robot 43, and the finish of the coated surface is improved. By providing a separate air supply duct in the coating booth 42, ionized air may be directly blown into the coating booth 42 or may be sprayed on the workpiece W.

FIG. 11 shows a fourth embodiment of the present invention. 4th
The ionizing air supply device 50 of the embodiment includes a coating booth 52.
A movable air supply box 53 is housed therein.
Air supply hoses 54a and 54b extend in front of the air supply box 53. A blower fan 56 is provided in the air supply box 53.
Is provided. An ionizer 57 is provided above the air supply box 53. The soft X-ray irradiation port of the ionizer 57 is directed to the air supply passage in the box. When the blower fan 56 is operated, the air in the painting booth 52 is taken into the air supply box 53 from the air supply port on the rear side of the box, and is ionized by soft X-ray irradiation. And the air supply hose 54
a and 54b are blown toward the dust removing position and the coating position of the article to be coated W.

According to the fourth embodiment, since the air supply box 50 can be freely moved in the painting booth, it is possible to quickly respond to a change in the painting position. In addition, the existing painting booth can be used as it is, and no trouble is required for construction of the duct and the like. Furthermore, the air supply hose 54
Since a and b can be formed short, the ion concentration of the blow air can be further increased.

FIG. 12 shows a fifth embodiment of the present invention. Fifth
In the embodiment, ionized air is supplied to each work booth of the coating line. In the ionized air supply device 60, an air supply duct 61 and a branch duct 63 are provided in an air supply chamber 61. Soft X-ray irradiators 65 and 66 are fixed to predetermined positions of the air supply chamber 61 and the air supply duct 62 toward the air supply passage. When the blower fan in the air supply chamber 61 is operated, the air taken in from the air supply port 61a causes the soft X-ray irradiator 65,
A predetermined amount of ionized air is blown into each of the dust removal booth B1, the charge removal booth B2, the conductive treatment booth B3, the first setting booth B4, the top coating booth B5, and the second setting booth B6 through each branch duct 63. Also, as required, blow air is blown onto the article to be coated by an air supply hose provided in each booth.
As described above, according to the fifth embodiment, it is possible to efficiently ionize the whole air, dust and static elimination air, and coating air sent to each of the booths B1 to B6 of the coating line with a relatively simple configuration. As a result, the dust in the coating space and the product surface is extremely small, and the defective rate during coating can be significantly reduced.

Although the ionized air supply apparatus according to the first to fifth embodiments has been described, the length, position, number, etc. of the air supply duct and the branch duct are not limited to those of the first to fifth embodiments, but may be changed as appropriate. May be. Further, the first to fifth embodiments may be appropriately combined. Further, the mounting position of the ionizer 5 can be changed to a ceiling portion of a painting booth or the like. Further, in the above-described embodiment, a movable conveyor is used as the coating table, but a fixed work table may be used instead of the conveyor.

Further, the ionized air supply device of the present invention can be widely applied to coating film formation including printing and the like. For example, the present invention can be applied to a printing technique such as a color printer or an ink jet printer, or spraying of an adhesive.

[0033]

As described above, the ionizing air supply device for a coating booth of the present invention has the following excellent effects. (a) It is possible to effectively remove dust from the coating booth by using a high concentration of ionized air. (b) High-concentration ionized air can be efficiently blown onto the surface to be coated of the article to be coated W, and the quality of the coated surface can be improved. (c) A safe working environment can be realized without generating harmful by-products such as ozone and nitrogen oxides in the painting booth. (d) When ionized air is generated, there is no need for safety measures to prevent electric shock and explosion. (e) Since high voltage discharge is not performed, no electromagnetic noise is generated. (f) Since the electron tube for generating soft X-rays is provided outside the air supply passage, there is no need for cleaning or the like even when used for a long time, and there is no need for maintenance.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an ionized air supply device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the ionized air supply device shown in FIG. 1 taken along the line II-II.

FIG. 3 is a perspective view showing an ionizer of the ionized air supply device according to the first embodiment of the present invention.

FIG. 4 is a side view showing an ionizer of the ionized air supply device according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a dust removing action by ionized air.

FIG. 6 is a schematic view showing a coating booth used in a dust removal test of the ionized air supply device according to the present invention.

FIG. 7 is a graph showing a result of a dust removal test of the ionized air supply device according to the present invention.

FIG. 8 is a sectional view showing an ionized air supply device according to a second embodiment of the present invention.

FIG. 9 is a partially cutaway side view showing an ionized air supply device according to a second embodiment of the present invention.

FIG. 10 is a sectional view showing an ionized air supply device according to a third embodiment of the present invention.

FIG. 11 is a perspective view showing the inside of an ionized air supply device according to a fourth embodiment of the present invention.

FIG. 12 is a perspective view illustrating an ionized air supply device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ionized air supply apparatus 2 Painting booth 2a Outlet 3 Supply air duct 4 Blow fan (Blow means) 5 Ionizer 7 Conveyor 8 Atomizer 9 Exhaust duct 10 Branch duct (Blow air duct) 11a Flexible hose (First duct) 11b Flexible hose (Second duct) 12 Partition wall 15 Damper 20 Case 21 Soft X-ray irradiation port 22 Fixed piece 24 Electron tube 25 Power supply 26 Cooling fan R Work space S Oil chamber W Coated product

Claims (3)

[Claims] A coating booth forming a work space for coating; an air supply duct for supplying air into the coating booth; air blowing means for feeding air into an air supply passage of the air supply duct; An ionizing air supply device for a coating booth, comprising: ionizing air generating means for irradiating soft X-rays to a predetermined area of the passage and ionizing air supplied to the coating booth. 2. The ionization air supply device for a coating booth according to claim 1, further comprising a blow air duct for blowing ionized air to the article to be coated, provided downstream of said air supply duct. 3. The blow air duct includes a first duct provided toward a dust removing position of the article to be coated, and a second duct provided toward a painting position of the article to be coated. The ionized air supply device for a coating booth according to claim 2.