JPS6154466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a paint booth equipped with an air curtain.

In a painting booth where car bodies are painted with a paint gun, etc., the purpose of improving painting quality, working environment, and pollution control is to have good ventilation and to remove the air in which paint particles are floating in the work space near the floor, especially under the floor. A paint booth is used in which the paint is removed and then discharged to the outside. In this type of painting booth, air is supplied by a blower to a static pressure chamber formed between the upper wall and the ceiling, and after the air is passed through a filter to remove dust, it is rectified by a grid formed on the ceiling to flow into the work space. In addition to quickly lowering the excess paint ejected from the painting gun to the floor, it also forms an air curtain that blows down from the ceiling between the object to be painted, such as an automobile body, and the painting worker. Efforts have also been made to prevent floating paint particles from reaching workers.

In conventional painting booths, the ventilation air that descends from the entire ceiling and the air for the air curtain are obtained from the same static pressure chamber. It is difficult to control coating quality when the viscosity and evaporability of the coating material change due to temperature changes.

The present invention uses separate and independent supply sources for the ventilation air that descends from almost the entire surface of the ceiling and the air for the air curtain formed between the object to be painted and the painter. The purpose is to achieve uniform coating quality regardless of changes in humidity and temperature.

Another object of the present invention is to form the air flow forming the air curtain at the most suitable position corresponding to the size of the object to be coated.

Furthermore, it is an object of the present invention to improve coating efficiency by adjusting the flow velocity distribution of the air flow forming the air curtain according to the size of the object to be coated, the position to be coated, or changes in air humidity and temperature. do.

That is, in the present invention, a chamber formed in the upper part of a ceiling plate stretched above a work space is communicated with the discharge side of a blower, and the air flow generated by the blower is almost uniformly distributed from the chamber through holes formed in the ceiling plate. At least one duct having a substantially rectangular opening whose length is significantly larger than its width and which supplies the work space downwardly is arranged so that the length direction of the opening is The duct is arranged so as to be close to one side wall of the work space so as to be substantially parallel to the side wall, and the opening opens toward the work space, and the duct is independent of the indoor space and is connected to the blower. By communicating with the discharge side, the air flow generated by the blower is supplied downward to the work space in the form of an air curtain from a nozzle provided at the opening of the duct, and the nozzle provided at the opening of the duct is movable in a direction substantially perpendicular to one side wall of the work space with respect to the opening, and when the nozzle is formed into a rigid frame-like body, the length of the opening of the duct of the nozzle is Both side walls of the direction are suspended from the side walls of the duct by deformable airtight walls, or are movable within the duct along a guide rod bridged in a substantially perpendicular direction to one side wall of the work space, or The nozzle is divided into two members arranged parallel to and opposite to each other in the length direction of the opening, and each of these two members is movable in a direction perpendicular to one side wall of the work space. This includes the means of

According to the present invention, the air curtain-like air flow supplied from the nozzle to the work space can be adjusted to match the workpiece by adjusting the size of the workpiece, the painting method, or the humidity, air temperature, etc. in the workspace. It is possible to supply the air by changing the distance and, in some cases, to change the thickness of the air curtain-like air flow.

The present invention will be further clarified by the following description based on the drawings.

FIG. 1 is a cross-sectional view schematically showing an embodiment of the painting booth of the present invention. A building 2 in which a painting space 1 is formed has a rod-like material or a plate-shaped material on the top of the painting space 1. A static pressure chamber 4 was constructed between the top of the building 2 and the ceiling plate 3 by constructing a ceiling plate 3 in which a large number of through holes were formed by combining materials in a lattice shape, and installed it outside the building 2. An air passage 6 that communicates with the discharge side of the blower 5 is made to communicate with the static pressure chamber 4, and a filter 7 is placed over the entire upper surface of the ceiling plate 3, so that air is not supplied from the blower 5 to the static pressure chamber 4. Dust is removed from the filtered air by a filter 7, and the purified air is blown down into the work space 1 through the through holes in the ceiling plate 3 at a substantially uniform speed. A flow rate control valve 8 is provided in the air passage 6, and the air volume is controlled by rotating around its axis.

The building 2 is provided with a floor plate 9 made of a grid-like plate or iron plate with many holes, and its bottom surface 10
A discharge space 11 is formed between the discharge space 1 and
1 is provided with an exhaust pipe 14 that communicates with the suction side of an exhaust fan 13 that fills water 12 at the bottom and sucks and removes air on the upper surface of the water 12 to the side.
The air in the work space 1 is controlled by a flow control valve 15 in the work space 1 to exclude air.

In the upper part of the work space 1, ducts 16 and 17 are arranged in the static pressure chamber 4 at positions separated from both side walls of the building 2 by a predetermined distance, and openings 18 and 19 at the lower ends of the ducts 16 and 17 are provided.
penetrates the ceiling plate 3 and opens below the ceiling plate 3. The ducts 16 and 17 each communicate with an air passage 20 which communicates with the discharge side of the blower 19, and the air supplied to the duct by the blower 19 through the air passage 20 is passed through the openings 18 and 19, respectively. It is configured to blow down into the work space 1. The amount of air blown down is controlled by rotation of a flow rate control valve 21 disposed in the air passage 20 around its axis.

The openings 18 and 19 of the ducts 16 and 17 have a substantially rectangular cross-sectional shape, and the length in the direction parallel to both side walls of the building 2 (perpendicular to the plane of the paper in FIG. 1) is in the direction perpendicular to the both side walls ( It is formed into an elongated shape that is significantly longer than the width (in the left-right direction of the paper surface of FIG. It is said that The positions where the ducts 16 and 17 are installed are approximately symmetrical with respect to the both side walls of the building 2, and the painter 10 is installed between the openings 16 and 17 and the side walls.
0 is a position that forms a space necessary for painting work, and also forms a space between both openings 16 and 17 in which the object to be painted 101 is accommodated.

The ends of the ducts 16 and 17 where the openings 18 and 19 are formed have a flange 23 that is placed and fixed on the periphery of the opening 22 of the ceiling plate 3, as shown in FIG. A filter 25 is placed on the upper surface of the wire mesh 24 stretched through the air passage 23 to clean the air when it is blown down like an air curtain. 18 and 19, rectangular support plates 26 and 26 whose longitudinal directions extend in the longitudinal direction of the opening 18 are fixed to the flanges 23 and 23, and side edges of the support plates 26 and 26 that are opposite to each other are fixed to the flanges 23 and 23. One end of the rectangular connecting plates 27, 27 is rotatably connected to the connecting plates 27, 27 by hinges 28, 28, respectively, and the connecting plates 27, 2
A frame-shaped nozzle body 30 having a nozzle opening 29 formed almost parallel to one side wall of the work space 1 is connected to the other end of the work space 1 by hinges 31, 31, and the nozzle body 30 is connected to the openings 18, 19. The air supplied to the air passage 20 is blown down from the nozzle opening 29 into the working space 1 in the form of an air curtain approximately parallel to one side wall of the working space 1.

One end of a rod 32 is pivotally attached to one of the outer surfaces of the connecting plate 27 by a pin 33, and the other end of the rod 32 is connected to an output shaft 35 of a control motor 34 attached to a suitable position on the ceiling plate 3. The rod 32 is pivotally connected via a pin 37 to a disk 36 which is fixed and rotatable in a plane perpendicular to the output shaft 35. , 27 around the axes of the hinges 28, 28 to move the nozzle body 30 almost horizontally,
The position of the air curtain blown down from the nozzle opening 29 is moved approximately perpendicularly to one side wall of the work space 1.

In FIG. 2, symbols 38 and 38 are the nozzle body 3.
The direction plate is hinged to the longitudinal side edge of the nozzle opening 29 of No. 0 with a hinge 39, and the direction plate 38, 3
When the air curtain 8 is rotated about the axis of the hinge 39, the air curtain can be tilted by the angle of rotation or can be formed into a diffused flow or a convergent flow. In addition, a thin piece 40 of a thin rubber plate or rubberized cloth that does not allow air circulation is installed over the support plate 26, the connecting plate 27, the nozzle body 30, and the direction plate 38 at the openings 18, 1.
9, attach it to the surface corresponding to the inner surface of the hinge 28,
This prevents air from leaking from parts 31 and 39.

According to the embodiment shown in FIGS. 1 and 2, the air supplied from the blower 5 to the static pressure chamber 4 through the air passage 6 is uniformly ventilated into the work space 1 from almost the entire surface of the ceiling plate 3. The ventilation air flow is supplied as a ventilation air flow by an independent blower 19 that is separate from this ventilation air flow, through an air passage 20, through the openings 18 and 19 of the ducts 16 and 17, and from the nozzle opening 29 of the nozzle body 30 in the form of an air curtain. An air flow is supplied into the work space 1, and the object to be painted 101 and the painting worker 100 are
Since an air curtain is formed between
The air curtain can be moved in a direction substantially perpendicular to one side wall of the work space 1, that is, in a direction substantially perpendicular to the length direction of the air curtain, via the rod 32 according to the rotation angle of the output shaft 35 of the air curtain. The distance between the constituent airflow and the coating surface of the object to be coated 101 can be set to be optimal for coating conditions. Furthermore, depending on the shape of the object 101 to be painted and the position of the surface to be painted, by changing the inclination of the direction plate 38, the blowing direction of the air curtain can be tilted, or the flow can be diffused or converged.

FIG. 3 shows a sectional view of the lower end of the duct 16 in the first embodiment of the present invention, in which a hollow shaft pipe 41 is attached along the upper edge of the connecting plate 27 shown in FIG. A shaft rod 42 is rotatably supported in the axial direction within the shaft tube 41, and rollers 43 are secured to both ends of the shaft rod 42, and the rollers 43 are fixed to the lower end of the duct 16. It is placed on a rail 44 vertically suspended from a side wall of the work space 1 so as to be able to roll freely in its length direction, and is installed in an appropriate case such as on a ceiling plate 3 as shown in FIG. The output shaft 35 of the control motor 34
and the shaft rod 42 are connected by a flexible shaft 45, and a pinion 46 fixed to the shaft rod 42 and a rack 47 provided on the rail 44 are meshed to ensure that the rotation of the control motor 34 is controlled by the roller. 43, each roller 43, 43
rolling the nozzle body 30 individually or simultaneously.
is movable in a direction perpendicular to one side wall of the work space 1. In this embodiment, the thin piece 40
One end is attached to the peripheral wall of the shaft tube 41, and the duct 1 is attached with a slack necessary for rolling of the roller 43.
The nozzle body 30 is fixedly attached to the side wall 46 of the nozzle body 30 so that all the airflow flowing inside the duct 16 is blown out from the nozzle opening 29 of the nozzle body 30. Other parts with the same reference numerals as in FIG. 2 indicate the same parts.

According to this embodiment, the upper end edge of the connecting plate 27 suspending the nozzle body 30 is rotatably supported by the shaft rod 42 of the roller 43 through the shaft tube 41.
Since both connecting plates 27 are movable separately by rollers 43, both connecting plates 27 can be moved simultaneously by rollers 43, and when fine movement is required, only one connecting plate 27 can be moved by rollers. 43
It can be moved by The lower end of the duct 17 is also configured in the same manner as described above.

FIG. 5 shows a sectional view of the lower end of the duct 16 in a second embodiment of the present invention, and the duct 17 is similarly constructed. A rail 44 is suspended from the lower end of the duct 16 as shown in FIG. A hollow tubular shaft tube 51 is fixed in the longitudinal direction to the upper part of the shaft tube 52, and a shaft rod 52 is rotatably supported in the axial direction within the shaft tube 52, and rollers 53, 53 fixed to both ends of the shaft rod 52 It is adapted to be moved on the rail 44 to one side wall of the work space 1 in a substantially perpendicular direction. Rail 44 has a fourth
As shown in the figure, the racks 47, 47 are fixed and the shaft rod 52
The flexible shaft 45 is connected to one side of the shaft rod 52 as shown in FIG. 4, and is rotationally driven by the output shaft 35 of the control motor 34. It is supposed to be done. Moreover, the thin piece 40 is a nozzle body 50.
The nozzle opening 49 is fixedly attached with a slack between the outer wall of the duct 16 and the side wall 46 of the duct 16 to prevent the airflow from being blown out from any other than the nozzle opening 49.

According to this embodiment, the volume shape of the nozzle body 50 is predetermined and does not change with the movement of the nozzle, so the discharge pressure of the air supply source, etc. can be adjusted according to the size of the object to be coated and the movement of the nozzle. There is no need for adjustment, and since it is integrally formed from a rigid plate material, there is no need to take measures against air leakage.It has a simple structure and does not cause air turbulence due to vibration deformation when moving. It has characteristics.

FIGS. 6 and 7 show a modification of the second embodiment in which the means for moving the nozzle is changed.
That is, racks 55 are fixed to end walls 54 formed at both ends of the nozzle body 50 in the longitudinal direction in parallel to the longitudinal direction of the rail 44, and the control motor 3 installed on the rail 44 is fixed.
A pinion 56 fixed to the output shaft 35 of No. 4 is meshed with the rack 55, and the nozzle body 50 is moved along the rail 44 by the roller 53 by rotation of the control motor 34.

FIG. 8 shows a sectional view of the lower end of the duct 16 in a fourth embodiment of the present invention. The duct 17 is similarly configured. In this embodiment, the rail 44 is suspended from the lower end of the duct 16 as in FIG. 5, and the nozzle body 60 has a shape in which the nozzle body 50 shown in FIG. Consisting of a pair of nozzle side plates 57 and 58, each of which is disposed movably along a rail 44 and facing each other as described later, a nozzle opening 59 is provided between the lower ends of both nozzle side plates 57 and 58.
is formed. The upper edge of each nozzle side plate 57, 58 is fixed to a hollow tubular shaft tube 61, and rollers 63, 63 are fixed to both ends of a shaft rod 62 that extends rotatably in the axial direction within the shaft tube 61. The rollers 63, 63 are placed on the upper surface of the rail 44 to allow each nozzle side plate 57, 58 to move freely along the rail 44 in a direction substantially perpendicular to one side wall of the work space 1, and also As shown in FIG. 4, a pinion 43 is fixed to 62, and a flexible shaft 45 is connected between it and the output shaft 35 of a control motor 34 installed at a proper location, and is rotated by the motor 34. , the rack 4 provided on the rail 44
Move along 7.

End walls 64, 6 formed parallel to the longitudinal direction of the rail 44 at both longitudinal ends of each nozzle side plate 57, 58.
A roller 66 is rotatably attached to the upper edge of the nozzle 5, and the roller 66 rolls on the upper surface of the rail 44 to stabilize the posture of each nozzle side plate 57, 58. Note that the reference numeral 67 indicates the end walls 64, 6.
The roller is rotatably attached to the nozzle side plate 5 and is engaged with the lower surface of the rail 44.
7,58 to ensure stable movement.

This embodiment has an advantage over the embodiment shown in FIG. 5 in that the width of the air curtain-like airflow can be adjusted.

FIG. 9 shows the duct 1 in the fifth embodiment of the present invention.
FIG. 6 shows a cross-sectional view of the lower end of No. 6. The lower end portion of the duct 17 is similarly configured. Nozzle body 70 of this embodiment
is a pair of shutter door-shaped shielding members formed by forming narrow plate-like materials into a C-shaped cross section, and reducing the curvature of both side edges so that they can be engaged with each other and rolled up onto a cylindrical shaft 71. 72, 72, and is disposed on the flange 23 of the duct 16 parallel to one side wall of the work space 1 in a direction perpendicular to said one side wall.
3, 73, and the collar edge 23
The opening 18 of the duct 16 is opened by winding it around a shaft 71 disposed close to the shaft 71, and the area of the opening 18 is narrowed by drawing it out from the shaft 71 along the guide member 73. It is located. A direction plate 74 extending downward is formed at the free end of the shielding members 72, 72, and the nozzle opening 69
are formed at the free ends of the pair of shielding members 72 between mutually opposing direction plates 74 .

According to this embodiment, the opening 69 of the nozzle body 70 is narrowed by rotating the shaft 71 manually or by a control motor or the like and letting out the shielding member 72 along the guide member 73. By rolling it up, the opening 69 can be enlarged, and the position of the opening 69 can be moved along the guide member 73 in a direction substantially perpendicular to one side wall of the work space.

In this embodiment, the blocking member 72 is not limited to the shutter door body shown in the drawings, but includes a plurality of plate-shaped members having a C-shaped cross section in parallel at intervals, for example, by engaging guide members 73 at both ends. These plate-like materials are clamped and fixed between thin rubber plates, and both ends of the plate-like members are slid along guide members 73, 73, and the rubber plates are wound around a cylindrical shaft 71. You can use the same format or similar formats.

As explained in detail above, the present invention supplies air that has been subjected to dust removal treatment downward from at least the upper part of a tunnel-shaped work space through a filter,
In a painting booth in which air in the work space is to be removed from near the floor of the work space, a chamber formed at the top of a ceiling plate stretched over the top surface of the work space is communicated with the discharge side of the blower, means for supplying airflow generated by the blower substantially uniformly downward through holes formed in the ceiling plate into the work space; and a substantially rectangular shape whose length is significantly larger than its width. at least one duct having an opening such that the longitudinal direction of the opening is substantially parallel to one side wall of the working space at a predetermined distance from the side wall, and the opening is directed toward the working space. The duct is arranged to be open, and the duct is made to be independent of the indoor space and communicated with the outlet of the blower,
means for supplying air flow generated by a blower to the work space in the form of an air curtain downward from a nozzle provided at the opening of the duct; It consists of a means movable in a substantially vertical direction on one side wall, and a means for blowing down air almost evenly into the work space from a chamber formed in the upper part of the ceiling board of the work space through holes in the ceiling board. Separately, a duct is provided that is independent of the indoor space and blows down the air supplied from the blower, and a nozzle provided at the opening of the duct blows an air curtain-like air flow down into the work space. Because I did it,
It isolates workers from air containing paint particles and solvent vapor, and removes air containing paint particles from near the floor of the work space to improve the work environment for painting work.
In addition, the nozzle installed at the opening of the duct is movable in a direction almost perpendicular to one side wall of the work space with respect to the duct, so that an air curtain-like air flow can be placed at the optimal position depending on the size of the object to be coated and the coating conditions. can be formed.

In particular, when the nozzle is formed into a rectangular frame-like body with approximately the same length as the opening of the duct, and the duct is suspended from the duct by a connecting plate or by a guide rod bridged within the duct. , the nozzle can be moved almost perpendicularly to one side wall of the work space with great ease, and by dividing the members constituting the nozzle into two parts and allowing relative movement, an air curtain-like structure can be created. It is also possible to change the thickness of the air.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a schematic sectional view of one embodiment, FIG. 2 is a sectional view of the main part thereof, and FIG. 3 is a sectional view of the main part of the second embodiment. ,
FIG. 4 is a partially cutaway side view showing an example of the nozzle moving means, FIG. 5 is a sectional view of the main part of the third embodiment, and FIGS. 6 and 7 are modified examples of the nozzle moving means. FIG. 8 is a sectional view of the main part of the fourth embodiment, and FIG. 9 is a sectional view of the main part of the fifth embodiment. In the figure, 1 is a work space, 2 is a building, 3 is a ceiling board, 5 and 19 are blowers, 16 and 17 are ducts, 1
Reference numerals 8 and 19 indicate the openings, 29, 49, 59, and 69 the nozzle openings, 30, 50, 60, and 70 the nozzle bodies, 34 the control motor, and 35 its output shaft, respectively.

Claims (1)

[Claims] 1. Air that has been subjected to dust removal processing is supplied downward through a filter from at least the upper part of a tunnel-shaped work space, and the air in the work space is directed to the outside from near the floor of the work space. In the painting booth that was to be eliminated, a chamber formed at the top of a ceiling plate stretched above the work space was communicated with the discharge side of the blower, and the air flow generated by the blower was passed through the hole formed in the ceiling plate. at least one duct having a substantially rectangular opening whose length is significantly larger than its width; The duct is arranged so that the width direction is substantially parallel to one side wall of the work space at a predetermined distance from the side wall, and the opening opens toward the work space, and the duct is connected to the indoor space. means for supplying the airflow generated by the blower to the work space in the form of an air curtain downward from a nozzle provided at the opening of the duct; means for making a nozzle provided in the opening movable in a direction substantially perpendicular to one side wall of the work space with respect to the opening. 2. The nozzle is formed into a rectangular rigid frame-like body having a length approximately the same as the length of the opening of the duct, and both longitudinal walls thereof are connected to the side walls of the duct by deformable airtight walls. 2. The painting booth according to claim 1, wherein the painting booth is suspended, and the wall body is provided with means for movable substantially perpendicularly to one side wall of the work space. 3. The nozzle is formed in a frame-like body having a length approximately equal to the length of the opening of the duct and a width smaller than the width of the opening, and is arranged within the duct in a direction approximately perpendicular to one side wall of the work space. 2. The coating booth according to claim 1, further comprising means for movable along the bridged guide rod. 4. The nozzle includes a pair of rigid walls extending parallel to and opposite to each other in the length direction of the opening, and the walls extend in a direction substantially perpendicular to one side wall of the work space within the duct. 2. The painting booth according to claim 1, further comprising means for allowing the painting booth to move freely along guide rods bridged over the painting booth. 5. Claims 3 or 4, characterized in that the longitudinally extending side wall of the nozzle is connected to the side wall of the duct by a deformable airtight shielding film. The painting booth described in . 6. A shielding member that can be wound up is engaged with and guided around rotating shafts disposed on both longitudinal edges of the opening along a guide member extending in the width direction of the opening of the duct, and the shielding member is caused to engage and guide the rotating shaft. 2. A paint booth according to claim 1, further comprising means for sliding said shielding members, each having one end attached thereto, along said guide member.