Dry coating equipment

Abstract

To provide a dry painting system that can reduce the overall height of the painting booth and lower the frequency of cleaning the space under the booth floor. [Solution] The paint booth 11 of the dry painting equipment of the present invention has a painting space formed above the breathable floor, and the object to be painted in the painting space is painted while being transported along a transport path 15 that extends in the longitudinal direction of the booth. A partition plate 24 is also provided at a position lower than the breathable floor, dividing the internal area of ​​the paint booth 11 into upper and lower sections. The area below the partition plate 24 is partitioned into an underfloor space of the booth that is flow-directly connected to a paint mist removal device. Openings 31 and 32 are formed on both sides of the transport path 15 in the partition plate 24 to allow booth air to flow into the underfloor space of the booth. The openings 31 and 32 have a vertical dimension that is long in the longitudinal direction of the booth and a horizontal dimension that is short in the width direction of the booth.

Description

[Technical Field]

[0001] The present invention relates to a dry painting system comprising a painting booth for painting an object to be painted, and a paint mist removal device for removing paint mist from the booth air. [Background technology]

[0002] Conventionally, dry painting equipment for painting objects such as automobile bodies is known. For example, in the dry painting equipment 101 shown in Figure 18, a paint mist removal device 105 is installed in the booth floor space 104 formed directly below the painting space 103 of the painting booth 102 (see, for example, Patent Document 1). The paint mist removal device 105 has a filter housing 107 capable of housing a filter 106, and is designed to remove paint mist from the booth air A1 discharged from the painting space 103. The filter 106 takes in booth air A1 from above (painting space 103 side) and discharges it from the side (right side in Figure 18).

[0003] In addition, low-floor wet painting equipment (painting equipment in which a paint mist removal device is placed outside the side wall of the painting booth) is also known. The painting booth equipped in this painting equipment has a partition plate that divides the interior area of ​​the painting booth into a painting space and a space under the booth floor. As a result, the booth air in the painting space flows into the space under the booth floor through an opening in the partition plate, and the paint mist in the booth air adheres to the bottom surface of the space under the booth floor. The paint mist is then removed by bringing the adhered paint mist into contact with water. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 6895011 [Overview of the project] [Problems that the invention aims to solve]

[0005] By the way, in a dry painting facility 101 in which a paint mist removal device 105 is installed in the space under the booth floor 104, the worker must enter the space under the booth floor 104 to perform maintenance on the paint mist removal device 105 (such as filter replacement and masking). In this case, the space under the booth floor 104 needs to be raised to facilitate worker access, which raises the overall height of the painting booth 102 and creates a problem of constraints on the installation location.

[0006] Furthermore, in low-floor wet painting equipment, the airflow velocity of the booth air passing through the opening is increased to improve the straightness of the booth air. As a result, the booth air is struck against the bottom surface of the space under the booth floor, causing more paint mist to adhere to the bottom surface. In this case, the paint mist can be efficiently removed by bringing it into contact with water. However, when using low-floor dry painting equipment that does not use water, water does not flow into the space under the booth floor, so the paint mist that adheres to the bottom surface of the space under the booth floor continues to accumulate without being washed away. As a result, there is a problem of increased frequency of cleaning of the space under the booth floor.

[0007] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a dry painting system that can reduce the overall height of the painting booth and reduce the frequency of cleaning the space under the booth floor. [Means for solving the problem]

[0008] To solve the above problems, the invention described in claim 1 is a dry painting equipment comprising: a painting booth having a pair of side walls and a breathable floor, a painting space formed above the breathable floor, and painting while transporting the object to be painted in the painting space along a transport path extending in the longitudinal direction of the booth; and a paint mist removal device having a filter housing capable of housing a filter, which removes paint mist from the booth air by flowing booth air discharged from the painting space through the filter, wherein the paint mist removal device is installed at a position offset in the width direction of the booth and outside one of the pair of side walls, and the breathable floor The gist of this dry painting equipment is that a partition plate is provided at a lower position to divide the internal area of ​​the painting booth vertically, and in the area below the partition plate, there is a space under the booth floor which is flow-directly connected to the paint mist removal device, and openings are formed on both sides of the transport path in the partition plate to allow the booth air to flow into the space under the booth floor, and the openings have a vertical dimension that is long in the longitudinal direction of the booth and a horizontal dimension that is short in the width direction of the booth, and the space under the booth floor guides the booth air that has passed through the openings in the width direction of the booth and supplies it to the paint mist removal device.

[0009] According to the invention described in claim 1, the paint mist removal device is installed in a position offset in the width direction of the booth, so as to be outside one of the pair of side walls of the paint booth. This allows the height of the space under the booth floor to be reduced by the height of the paint mist removal device, and consequently, the overall height of the paint booth can be reduced. Therefore, when workers replace or protect the filters housed in the filter housing of the paint mist removal device, they do not need to enter the space under the booth floor. This makes it easy to replace and protect the filters.

[0010] Furthermore, the opening that allows booth air to flow into the space beneath the booth floor is rectangular in shape, with a long vertical dimension in the length direction of the booth and a short horizontal dimension in the width direction of the booth. As a result, the booth air passing through the opening becomes thinner in the width direction of the booth, causing the air velocity to decrease and thus reducing the straightness of the booth air. Consequently, the booth air becomes more bendable, reducing the amount of paint mist that adheres to the bottom surface of the space beneath the booth floor. Therefore, the frequency of cleaning the space beneath the booth floor can be reduced.

[0011] Furthermore, openings are formed on both sides of the transport path. As a result, the booth air passing through one opening is supplied to the paint mist removal device without being obstructed by the booth air passing through the other opening, and without being disturbed by the flow of booth air passing through the other opening. Consequently, it is possible to prevent paint mist from being blown up or scattered within the space under the booth floor.

[0012] The invention described in claim 2 is characterized in that, in claim 1, the aspect ratio of the opening is 2.0 or more and less than 5.0.

[0013] The invention described in claim 3 is characterized in that, in claim 2, the wind speed of the booth air passing through the opening is 0.5 m / s or more and 3.0 m / s or less.

[0014] The invention described in claim 4 is characterized in that, in claim 3, the opening is a first opening located far from the paint mist removal device and a second opening located close to the paint mist removal device, and the first opening and the second opening are spaced at least 1500 mm apart. [Effects of the Invention]

[0015] As detailed above, according to the inventions described in claims 1 to 4, the overall height of the paint booth can be reduced, and the frequency of cleaning the space under the booth floor can be reduced. [Brief explanation of the drawing]

[0016] [Figure 1] Schematic cross-sectional view showing the dry painting equipment in this embodiment. [Figure 2] Schematic plan view showing the paint mist removing device, the space under the booth floor, and the opening. [Figure 3] Schematic plan view showing the conveyor frame and the partition plate. [Figure 4] Principal part plan view showing the conveyor frame and the partition plate. [Figure 5] Schematic perspective view showing the structure of the space under the booth floor. [Figure 6] Table showing the relationship between the shape of the opening and the paint mist adhering to the space under the booth floor. [Figure 7] Diagram showing the wind speed distribution of the booth air in Comparative Example 3. [Figure 8] Diagram showing the wind speed distribution of the booth air in Example 2. [Figure 9] Table showing the relationship between the aspect ratio of the opening and the paint mist adhering to the space under the booth floor. [Figure 10] In Example 1A, (a) is a diagram showing the wind speed distribution of the booth air, and (b) is a diagram showing the behavior of the paint mist. [Figure 11] In Example 2A, (a) is a diagram showing the wind speed distribution of the booth air, and (b) is a diagram showing the behavior of the paint mist. [Figure 12] In Example 3A, (a) is a diagram showing the wind speed distribution of the booth air, and (b) is a diagram showing the behavior of the paint mist. [Figure 13] In Example 4A, (a) is a diagram showing the wind speed distribution of the booth air, and (b) is a diagram showing the behavior of the paint mist. [Figure 14] In Example 5A, (a) is a diagram showing the wind speed distribution of the booth air, and (b) is a diagram showing the behavior of the paint mist. [Figure 15] Table showing Examples 1B to 4B when the processing air volume is changed. [Figure 16] Schematic plan view showing the paint mist removing device, the space under the booth floor, and the opening in other embodiments. [Figure 17]A schematic plan view showing a paint mist removal device, booth underfloor space, and opening in another embodiment. [Figure 18] A schematic cross-sectional view showing a conventional dry coating equipment. [Modes for carrying out the invention]

[0017] Hereinafter, one embodiment embodying the present invention will be described in detail with reference to the drawings.

[0018] As shown in Figure 1, the dry painting equipment 10 of this embodiment includes a painting booth 11 and a paint mist removal device 40. The painting booth 11 has a pair of side walls 12 and 13 and a breathable floor section 14 such as a grating. The side walls 12 and 13 are a first side wall 12 located farther from the paint mist removal device 40 and a second side wall 13 located closer to the paint mist removal device 40. A painting space S1 is formed above the breathable floor section 14. On the other hand, a grid-like conveyor frame 21 (see Figures 3 and 4) is provided at a position lower than the breathable floor section 14.

[0019] Furthermore, the painting space S1 houses a transport path 15 extending in the longitudinal direction of the booth (in Figure 1, the direction perpendicular to the plane of the paper) and a plurality of painting robots 16 positioned on both sides of the transport path 15. The transport path 15 is constructed by installing a conveyor 22 on a conveyor frame 21. In the painting booth 11, the object to be painted W1 (in this embodiment, a car body) in the painting space S1 is painted as it is transported along the transport path 15 by spraying atomized paint (paint mist M1 shown in Figure 5) from the paint gun of the painting robot 16.

[0020] As shown in Figure 1, a ceiling wall 17 is provided above the painting space S1. The ceiling wall 17 has a mesh structure, and booth air B0 is supplied to the upper side. As a result, the booth air B0 flows down through the painting booth 11 after passing through the ceiling wall 17, so that the paint mist M1 that does not adhere to the object to be painted W1 is guided downwards.

[0021] As shown in Figures 3 and 4, the conveyor frame 21 has multiple grids 23. Each grid 23 is rectangular in shape, with a long vertical dimension in the longitudinal direction of the booth (up and down in Figures 2 to 4) and a short horizontal dimension in the width direction of the booth (left and right in Figures 1 to 4). The aspect ratio of the grids 23 is, for example, between 2.0 and less than 4.0. Each grid 23 is closed off by a partition plate 24 that is rectangular in shape when viewed from above. These partition plates 24 are supported by the conveyor frame 21 and divide the internal area of ​​the painting booth 11 vertically. Below each partition plate 24 is an under-booth space S2 (see Figures 1, 2, and 5) which is connected to the paint mist removal device 40 via a flow path.

[0022] As shown in Figures 1 to 4, some of the partition plates 24 have openings 31 and 32 formed in them to allow booth air B0 to flow into the space S2 under the booth floor. The openings 31 and 32 are rectangular in shape, with a vertical dimension L1 (see Figure 4) that is long in the longitudinal direction of the booth and a horizontal dimension L2 (see Figure 4) that is short in the width direction of the booth. The aspect ratio of the openings 31 and 32 is 2.0 or more and less than 5.0, preferably 2.0 or more and less than 4.0. Furthermore, the opening area of ​​the openings 31 and 32 is smaller than the area of ​​one of the grids 23 of the conveyor frame 21. Specifically, the vertical dimension L1 of the openings 31 and 32 is smaller than the vertical dimension L1' (see Figure 4) of the grid 23, and the horizontal dimension L2 of the openings 31 and 32 is smaller than the horizontal dimension L2' (see Figure 4) of the grid 23. Therefore, the opening area of ​​openings 31 and 32 is smaller than the area of ​​the grid 23.

[0023] Furthermore, multiple openings 31 and 32 are arranged adjacent to each other along the longitudinal direction of the booth, on both sides of the transport path 15 (on the left and right sides of the transport path 15 in Figures 1 to 3). Each opening 31 or 32 is formed within the space S2 under the booth floor (see Figure 2). The openings 31 and 32 are a first opening 31 located farther from the paint mist removal device 40 and a second opening 32 located closer to the paint mist removal device 40. The first opening 31 and the second opening 32 are arranged so that their distances from the transport path 15 are equal. Specifically, the distance D1 from the center C0 of the transport path 15 (see Figure 1) to the center C1 of the first opening 31 (see Figures 1 and 3), and the distance D2 from the center C0 of the transport path 15 to the center C2 of the second opening 32 (see Figures 1 to 4) are equal to each other. Furthermore, the center C1 of the first opening 31 and the center C2 of the second opening 32 are spaced at least 1500 mm, preferably 3000 mm to 4500 mm, in the booth width direction. In addition, the pitch between the centers C1 of adjacent first openings 31 in the booth longitudinal direction is 1000 mm to 2000 mm (1500 mm in this embodiment). Similarly, the pitch between the centers C2 of adjacent second openings 32 in the booth longitudinal direction is also 1000 mm to 2000 mm (1500 mm in this embodiment).

[0024] Furthermore, as shown in Figures 3 and 4, each partition plate 24 is arranged in four rows on both the left and right sides of the transport path 15 along the width direction of the booth. The first opening 31 is formed in all of the partition plates 24 in the second row from the left among the partition plates 24 on the right side of the transport path 15. On the other hand, the second opening 32 is formed in all of the partition plates 24 in the second row from the right among the partition plates 24 on the left side of the transport path 15. In other words, the openings 31 and 32 are positioned so as to avoid the position of the conveyor frame 21 in the horizontal direction.

[0025] As shown in Figures 1, 2, and 5, the booth floor space S2 is connected to a paint mist removal device 40 via a connecting duct 25 at its end (right end in Figures 1 and 2). The booth floor space S2 is designed to guide the booth air B0 that has passed through the openings 31 and 32 in the booth width direction and supply it to the paint mist removal device 40. In this embodiment, multiple paint mist removal devices 40 are connected to the booth floor space S2. Each paint mist removal device 40 is provided only at the right end of the booth floor space S2. As shown in Figure 5, the booth floor space S2 consists of a main space S3 and a sub-space S4. Note that Figure 5 is a diagram used for analysis, and for convenience, only a portion of the booth floor space S2, region P1 (see Figure 2), is shown. In region P1, one paint mist removal device 40 and a pair of openings 31 and 32 are arranged along the booth width direction. The height U2 of the booth floor space S2 is between 800 mm and 1500 mm, and the length U3 of the booth floor space S2 is between 4000 mm and 8000 mm. The secondary space S4 has a rectangular cross-section and extends laterally (towards the upper left in Figure 5) toward the paint mist removal device 40. The height of the secondary space S4 is less than the height U2 of the main space S3. Furthermore, the length U4 of the secondary space S4 is less than the length U5 of the main space S3, specifically between one-tenth and one-fifth of the length U5.

[0026] As shown in Figures 1 and 2, the paint mist removal device 40 is a device that removes paint mist M1 contained in the booth air B0 discharged from the paint booth 11. The paint mist removal device 40 is offset in the booth width direction (to the right in Figures 1 and 2) and is installed outside the second side wall 13, which is one of the pair of side walls 12 and 13. In other words, in this embodiment, multiple paint mist removal devices 40 are arranged on the same side of the paint booth 11.

[0027] Furthermore, the paint mist removal device 40 has a filter housing 42 capable of housing a filter 41. The paint mist removal device 40 removes paint mist M1 from the booth air B0 discharged from the painting space S1 by flowing the booth air B0 discharged from the painting space S1 through the filter 41 housed in the filter housing 42. An exhaust duct 51 is connected to the filter housing 42 to discharge the booth air B0 that has passed through the filter 41.

[0028] Next, we will explain how to remove the paint mist M1 contained in the booth air B0.

[0029] First, when the painting robot 16 sprays paint from its paint gun to paint the object W1, the oversprayed paint mist M1, along with the booth air B0 of the painting space S1, passes sequentially through the openings 31 and 32 of the ventilated floor section 14 and partition plate 24, and is guided to the main space S3 side of the booth floor space S2. The booth air B0 that passes through the first opening 31 becomes the first airflow B1, and the booth air B0 that passes through the second opening 32 becomes the second airflow B2.

[0030] Furthermore, the inventors of this application have newly discovered that if the openings 31 and 32 are rectangular in shape, the thickness of the airflow B1 and B2 passing through the openings 31 and 32 becomes thinner in the width direction of the booth. As a result, the airflow velocity of B1 and B2 decreases sharply after traveling a predetermined distance from the openings 31 and 32, reducing their directional properties and making it easier to guide the airflow B1 and B2 towards the paint mist removal device 40. Moreover, the openings 31 and 32 in this embodiment are made by lengthening the vertical dimension of a conventionally used square opening (the horizontal dimension remains the same), so their cross-sectional area is larger than that of conventional openings. This also reduces the airflow velocity of the airflow B1 and B2 passing through the openings 31 and 32, reducing their directional properties and making it easier to guide the airflow B1 and B2 towards the paint mist removal device 40. In addition, the inside of the filter housing 42 and the exhaust duct 51 located downstream of the booth floor space S2 are under negative pressure due to a blower (not shown). As a result, the airflows B1 and B2 introduced into the main space S3 are reliably bent from below to the side (specifically towards the paint mist removal device 40). At this time, some of the airflows B1 and B2 that were not bent collide with the bottom surface of the main space S3, causing some of the paint mist M1 contained in the airflows B1 and B2 to adhere to the bottom surface (see Figure 5).

[0031] The airflows B1 and B2, whose direction has been changed, are then supplied to the paint mist removal device 40. At this time, the second airflow B2 passes through the connecting duct 25 and then through the filter 41 of the filter housing 42 (paint mist removal device 40). Meanwhile, the first airflow B1 is pulled and drawn in by the second airflow B2, and passes through the connecting duct 25 along with the flow of the second airflow B2, and then through the filter 41 of the filter housing 42 (paint mist removal device 40). Therefore, the first airflow B1 is not obstructed by the second airflow B2. In other words, both the first airflow B1 and the second airflow B2 flow smoothly toward the paint mist removal device 40. The paint mist M1 contained in the airflows B1 and B2 is removed by adhering to the surface of the filter 41.

[0032] The airflows B1 and B2, from which the paint mist M1 has been removed, are then discharged to the outside of the filter housing 42. Subsequently, the airflows B1 and B2 are discharged to the outside of the dry painting equipment 10 through the exhaust duct 51.

[0033] Next, we will explain the comparative tests of dry-coating equipment and their results.

[0034] (1) First comparative test First, we assumed a dry coating equipment with a booth floor space measuring 2000mm in width, 1100mm in height, and 5800mm in length. Next, we prepared the following measurement samples by changing the dimensions of the openings in the partition plates of the dry coating equipment. Specifically, we made the partition plates with vertical and horizontal dimensions of 500mm each, an aspect ratio of 1.0, and an opening area of ​​0.25m². 2 A partition plate having a square-shaped opening (i.e., a conventional opening) was used, and this was designated as Comparative Example 1. Similarly, a partition plate with a vertical and horizontal dimension of 707 mm, an aspect ratio of 1.0, and an opening area of ​​0.5 m² was used. 2 A partition plate with a square-shaped opening was used, and this was designated as Comparative Example 2. Furthermore, the partition plate had a vertical dimension of 1000 mm, a horizontal dimension of 500 mm, an aspect ratio of 2.0, and an opening area of ​​0.5 m². 2 A partition plate having a rectangular opening was used, and this was designated as Example 1. Furthermore, the partition plate had a vertical and horizontal dimension of 866 mm, an aspect ratio of 1.0, and an opening area of ​​0.75 m². 2 A partition plate with a square-shaped opening was used, and this was designated as Comparative Example 3. Furthermore, the partition plate had a vertical dimension of 1500 mm, a horizontal dimension of 500 mm, an aspect ratio of 3.0, and an opening area of ​​0.75 m². 2 A partition plate having a rectangular opening was used, and this was designated as Example 2.

[0035] Next, for each measurement sample (Examples 1 and 2, Comparative Examples 1 to 3), a simulation was performed in which booth air from the painting space was introduced into the space under the booth floor through two openings. The total volume of booth air flowing through the openings into the space under the booth floor was set to 80 m³. 3 The airflow rate of the booth air flowing from the space under the booth floor to the paint mist removal device is set to 160 m³ / min × 2. 3The setting was set to / min. Then, simulations were performed to calculate the proportion of paint mist contained in the booth air that adheres to the space under the booth floor and the proportion of paint mist that flows into the paint mist removal device. The results are shown in Figure 6.

[0036] As a result, it was confirmed that in Comparative Examples 1-3, which have a square-shaped opening, the proportion of paint mist adhering to the space under the booth floor was more than 50% (92.4%, 72.8%, and 57.5%). For example, in Comparative Example 3 (see Figure 7), the booth air passing through the opening has high straightness. As a result, the booth air is struck against the bottom surface of the main space under the booth floor, so it is thought that a large amount of paint mist adheres to the bottom surface. Also, because of the high straightness, the booth air does not bend easily, so there are more stagnant areas where the booth air accumulates, and it is thought that the amount of paint mist adhering to the space under the booth floor increases. Note that in Figure 7, the area with a higher booth air velocity is lighter in color, and the area with a lower booth air velocity is darker in color. The same is true in Figure 8.

[0037] On the other hand, in Examples 1 and 2, which have rectangular openings, it was confirmed that the proportion of paint mist adhering to the space under the booth floor was reduced compared to Comparative Examples 1 to 3 (47.9% and 15.4%, respectively). For example, in Example 2 (see Figure 8), the straightness of the booth air passing through the opening is reduced compared to Comparative Example 3. As a result, the booth air becomes more flexible, making it less likely to hit the bottom surface of the main space, thus reducing the amount of paint mist adhering to the bottom surface. Furthermore, because the straightness is reduced, the booth air becomes more flexible, which reduces stagnation and thus reduces the amount of paint mist adhering to the space under the booth floor.

[0038] Based on the above, if the opening is made into a long rectangle in the longitudinal direction of the booth, the straightness of the booth air passing through the opening will decrease and it will be more prone to bending. As a result, the booth air flowing into the space under the booth floor will be more easily pulled in the horizontal direction (the flow towards the paint mist removal device). Consequently, it is thought that the proportion of paint mist in the booth air that adheres to the space under the booth floor will decrease.

[0039] (2) Second comparative test Furthermore, the following samples were prepared for measurement. The partition plate in the dry-coating equipment was defined as a partition plate with a vertical dimension of 1400 mm, a horizontal dimension of 500 mm, and an opening with an aspect ratio of 2.8; this was designated as Example 1A. The partition plate was defined as a partition plate with a vertical dimension of 1400 mm, a horizontal dimension of 450 mm, and an opening with an aspect ratio of 3.1; this was designated as Example 2A. The partition plate was defined as a partition plate with a vertical dimension of 1400 mm, a horizontal dimension of 400 mm, and an opening with an aspect ratio of 3.5; this was designated as Example 3A. The partition plate was defined as a partition plate with a vertical dimension of 1400 mm, a horizontal dimension of 350 mm, and an opening with an aspect ratio of 4.0; this was designated as Example 4A. The partition plate was defined as a partition plate with a vertical dimension of 1400 mm, a horizontal dimension of 300 mm, and an opening with an aspect ratio of 4.7; this was designated as Example 5A.

[0040] Next, for each measurement sample (Examples 1A to 5A), simulations were performed in which booth air from the painting space was introduced into the space beneath the booth floor through an opening. Then, simulations were performed to calculate the airflow velocity of the booth air passing through the opening. In addition, simulations were performed to calculate the proportion of paint mist contained in the booth air that adheres to the space beneath the booth floor. The results of these simulations are shown in Figure 9.

[0041] As a result, it was confirmed that as the aspect ratio of the opening increased, the proportion of paint mist adhering to the space under the booth floor decreased. In Figures 10(b), 11(b), 12(b), 13(b), and 14(b), paint mist is shown as dots. That is, by increasing the aspect ratio of the opening, the thickness of the booth air flowing into the space under the booth floor becomes thinner (see Figures 10(a), 11(a), 12(a), 13(a), and 14(a)). This makes it easier for the booth air to bend towards the paint mist removal device, which is thought to reduce stagnant areas where booth air accumulates, and thus reduce the amount of paint mist adhering to the space under the booth floor. The stagnant areas occur directly below the first opening, which is far from the paint mist removal device, and near the connection point between the bottom of the main space and the side wall.

[0042] However, as the aspect ratio of the opening increases, the wind speed of the booth air passing through the opening becomes higher. As a result, in Examples 4A and 5A, the booth air (second air flow) passing through the second opening located close to the paint mist removal device forms an air wall in the booth underfloor space. In this case, since the booth air (first air flow) passing through the first opening is blocked by the second air flow, it was confirmed that the paint mist in the first air flow rises and scatters (see FIGS. 13(b) and 14(b)). Therefore, it was confirmed that if the aspect ratio of the opening is, for example, 2.0 or more and less than 4.0, it is possible to increase the rectification in the booth underfloor space while reducing the paint mist adhering to the booth underfloor space. Also, in Example 5A, since the wind speed of the booth air passing through the opening exceeds 3.0 m / s, it was confirmed that the flow of the paint mist is disturbed and it is likely to meander, and the paint mist is likely to adhere to the booth underfloor space. In FIGS. 10(a), 11(a), 12(a), 13(a), and 14(a), the higher the wind speed region of the booth air, the lighter the color, and the lower the wind speed region of the booth air, the darker the color.

[0043] (3) Third Comparative Test Furthermore, when the aspect ratio of the opening is 2.0 or more and less than 4.0 and the wind speed of the booth air passing through the opening is 0.5 m / s or more and 3.0 m / s or less, measurement samples when changing the processing air volume were prepared as follows. The partition plate provided in the dry painting equipment was a partition plate having an opening with a vertical dimension of 1400 mm, a horizontal dimension of 400 mm, and an aspect ratio of 3.5, and the measurement sample with the wind speed of the booth air passing through the opening being 2.0 m / s and the processing air volume being 135 m 3 / min was used as Example 1B. The partition plate was a partition plate having an opening with a vertical dimension of 1400 mm, a horizontal dimension of 450 mm, and an aspect ratio of 3.1, and the wind speed of the booth air passing through the opening was 2.1 m / s and the processing air volume was 160 m 3A sample used for measurement, with a flow rate of / min, was designated as Example 2B. The partition plate had an opening with a vertical dimension of 1400 mm, a horizontal dimension of 500 mm, and an aspect ratio of 2.8. The airflow velocity of the booth air passing through the opening was set to 2.3 m / s, and the processing airflow rate was set to 190 m³. 3 Example 3B was a measurement sample with a volume of / min, the airflow velocity of the booth air passing through the opening was 2.6 m / s, and the processing volume was 220 m³. 3 The measurement sample with a min level of / min was designated as Example 4B.

[0044] Next, in each of Examples 1B to 4B, simulations were performed to calculate the proportion of paint mist contained in the booth air that adheres to the space beneath the booth floor. The results are shown in Figure 15.

[0045] As a result, the processing airflow rate was changed to, for example, 50 m³. 3 / min or more 250m 3 Less than or equal to / min, preferably 135m 3 / min or more 220m 3 It was confirmed that setting the level to / min or lower can keep the percentage of paint mist adhering to the space under the booth floor low, for example, between 15% and 19%.

[0046] Therefore, according to this embodiment, the following effects can be obtained.

[0047] (1) In the dry painting equipment 10 of this embodiment, the paint mist removal device 40 is installed in a position offset in the width direction of the booth and outside the second side wall 13 of the painting booth 11. As a result, the height U2 of the space under the booth floor S2 can be lowered by the height of the paint mist removal device 40, and consequently the overall height of the painting booth 11 can be reduced. Therefore, when workers replace or mask the filter 41 housed in the filter housing 42 of the paint mist removal device 40, they do not need to enter the space under the booth floor S2. This makes it easy to replace or mask the filter 41.

[0048] Furthermore, the openings 31 and 32 that allow booth air B0 to flow into the booth underfloor space S2 are rectangular in shape, with a vertical dimension L1 that is long in the longitudinal direction of the booth and a horizontal dimension L2 that is short in the width direction of the booth. As a result, the booth air B0 that passes through the openings 31 and 32 becomes thinner in the width direction of the booth, causing the air velocity to decrease, thus reducing the straightness of the booth air B0 (see Figure 5). In addition, the filter housing 42 of the paint mist removal device 40 located downstream of the booth underfloor space S2 is under negative pressure due to a blower (not shown). As a result, the booth air B0 is more likely to bend towards the paint mist removal device 40. Therefore, the paint mist M1 contained in the booth air B0 can be collected by concentrating it in the filter 41 in the filter housing 42, and consequently, the amount of paint mist M1 adhering to the bottom surface of the booth underfloor space S2 decreases. Consequently, the frequency of cleaning the booth underfloor space S2 can be reduced.

[0049] Furthermore, openings 31 and 32 are formed on both sides of the transport path 15. As a result, the first airflow B1, which is booth air B0 that has passed through the first opening 31, is supplied to the paint mist removal device 40 without being obstructed by the second airflow B2, which is booth air B0 that has passed through the second opening 32, and is carried along by the flow of the second airflow B2 without being disturbed. Consequently, it is possible to prevent paint mist M1 from being stirred up or scattered within the space S2 under the booth floor.

[0050] (2) As described above, in this embodiment, the height U2 of the booth underfloor space S2 can be lowered by the height of the paint mist removal device 40. However, when the booth underfloor space S2 is lowered, the booth air B0 that has passed through the opening is more likely to collide with the bottom surface of the booth underfloor space S2 at a high speed. As a result, there is a problem that the paint mist M1 contained in the booth air B0 is more likely to adhere to the bottom surface of the booth underfloor space S2.

[0051] Therefore, in this embodiment, the booth air B0 in the painting space S1 is allowed to flow into the booth underfloor space S2 through two openings 31 and 32. As a result, the flow velocity of the booth air B0 passing through the first opening 31 and the flow velocity of the booth air B0 passing through the second opening 32 are both reduced, and the collision velocity of the booth air B0 with the bottom surface of the booth underfloor space S2 is also reduced. Consequently, the adhesion of paint mist M1 to the bottom surface of the booth underfloor space S2 can be reduced.

[0052] (3) In this embodiment, the center C1 of the first opening 31 (see Figures 1 to 3) and the center C2 of the second opening 32 (see Figures 1 to 4) are spaced apart by 1500 mm or more, preferably 3000 mm or more and 4500 mm or less. As a result, the distance between the openings 31 and 32 is appropriately maintained, so that the first airflow B1 flowing in from the first opening 31 and the second airflow B2 flowing in from the second opening 32 do not interfere with each other in the space S2 under the booth floor. Therefore, it becomes possible to form airflows B1 and B2 that can smoothly guide the paint mist M1 to the paint mist removal device 40.

[0053] (4) In this embodiment, each of the multiple grids 23 of the conveyor frame 21 is closed by a partition plate 24, and openings 31 and 32 are formed in parts of the multiple partition plates 24. The opening area of ​​the openings 31 and 32 is smaller than the area of ​​one of the grids 23. This prevents the airflows B1 and B2 passing through the openings 31 and 32 from colliding with the grids 23 and being disturbed. It also prevents the paint mist M1 contained in the airflows B1 and B2 from adhering to the grids 23 and causing contamination.

[0054] (5) In this embodiment, the first opening 31 is positioned at a distance from the first side wall 12 of the paint booth 11. This prevents the first airflow B1 flowing in from the first opening 31 from colliding with the first side wall 12 and becoming turbulent. Therefore, it is possible to prevent paint mist M1 from being stirred up or scattered in the space S2 under the booth floor due to turbulence of the first airflow B1.

[0055] The above embodiment may be modified as follows.

[0056] The openings 31 and 32 in the above embodiment were rectangular in shape, having a vertical dimension L1 that is longer in the longitudinal direction of the booth and a horizontal dimension L2 that is shorter in the width direction of the booth. However, the openings may have other shapes, such as an ellipse or a rhombus, as long as they have a vertical dimension that is longer in the longitudinal direction of the booth and a horizontal dimension that is shorter in the width direction of the booth.

[0057] In the above embodiment, the aspect ratio of each opening 31, 32 was 2.0 or more and less than 4.0. However, the aspect ratio of each opening 31, 32 may be 4.0 or more. For example, as shown in Figure 16, each opening 31, 32 may be an opening with a vertical dimension of 2900 mm, a horizontal dimension of 500 mm, and an aspect ratio of 5.8. Alternatively, as shown in Figure 17, each opening 31, 32 may be an opening with a vertical dimension of 8900 mm, a horizontal dimension of 500 mm, and an aspect ratio of 17.8.

[0058] In the above embodiment, the partition plate 24 blocked off each of the multiple grids 23 of the conveyor frame 21. However, the partition plate may block off two or more of the grids 23. In this case, the partition plate may be placed on the conveyor frame 21 or attached to the underside of the conveyor frame 21.

[0059] In the above embodiment, an automobile body was used as an example of the workpiece W1 to be painted in the paint booth 11, but it is not limited to this. For example, the workpiece may be an interior part of an automobile such as an instrument panel, console box, or armrest, or an exterior part of an automobile such as a bumper or aerodynamic add-on parts (spoiler, etc.). Furthermore, the workpiece W1 does not necessarily have to be an automobile part.

[0060] Next, in addition to the technical ideas described in the claims, the technical ideas that can be grasped by the embodiments described above are listed below.

[0061] (1) The dry coating equipment according to claim 1, characterized in that the aspect ratio of the opening is 2.0 or more and less than 4.0.

[0062] (2) The dry coating equipment according to claim 1, characterized in that the pitch between adjacent openings in the longitudinal direction of the booth is 1000 mm or more and 2000 mm or less.

[0063] (3) The dry coating equipment according to claim 1, characterized in that the aspect ratio of the opening is 4.0 or greater.

[0064] (4) The dry painting equipment according to any one of claims 1 to 4, wherein the opening is a first opening located far from the paint mist removal device and a second opening located close to the paint mist removal device, and the booth air that has passed through the first opening and the booth air that has passed through the second opening become a first airflow and a second airflow, respectively, which are thinner in the width direction of the booth, and the first airflow is supplied to the paint mist removal device by riding on the flow of the second airflow without being obstructed by the second airflow.

[0065] (5) In the technical concept of (4), the pair of side walls is a first side wall located far from the paint mist removal device and a second side wall located close to the paint mist removal device, and the first opening is installed at a distance from the first side wall.

[0066] (6) A dry coating apparatus characterized in that, in the technical concept of (4) or (5), the first opening and the second opening are arranged such that they are at equal distances from the transport path.

[0067] (7) The dry coating equipment according to any one of claims 1 to 4, wherein the transport path is configured by installing a conveyor on a grid-shaped conveyor frame provided at a lower position than the breathable floor, the partition plate is supported by the conveyor frame, and the opening has an opening area smaller than the area of ​​one grid of the conveyor frame, and is arranged so as to avoid the position of the conveyor frame in the horizontal direction.

[0068] (8) In any one of claims 1 to 4, the processing air volume is 50 m 3 / min or more 250m 3 A dry coating equipment characterized by a minimum output of / min.

[0069] (9) A dry coating equipment according to any one of claims 1 to 4, characterized in that the height of the space under the booth floor is 800 mm or more and 1500 mm or less.

[0070] (10) A dry coating equipment according to any one of claims 1 to 4, characterized in that the length of the space under the booth floor is 4000 mm or more and 8000 mm or less. [Explanation of Symbols]

[0071] 10…Dry painting equipment 11…Paint booth 12...First side wall as a side wall 13…Second side wall as a side wall 14…Breathable floor 15…Conveyor path 24... Partition plate 31...First opening as an opening 32...Second opening as an opening 40…Paint mist removal device 41…Filter 42…Filter housing B0... Booth Air L1…Vertical dimension L2...Width M1... Paint mist S1...Painting space S2…Booth Under-Bed Space W1…Applied material

Claims

1. A paint booth having a pair of side walls and a ventilated floor, a paint space formed above the ventilated floor, and a paint booth that paints while transporting the object to be painted within the paint space along a transport path extending in the longitudinal direction of the booth, A paint mist removal device having a filter housing capable of housing a filter, and which removes paint mist from the booth air discharged from the painting space by flowing booth air through the filter, A dry painting facility comprising the paint mist removal device being installed in a position offset in the booth width direction so as to be outside one of the pair of side walls, A partition plate is installed at a position lower than the aforementioned ventilated floor section, dividing the internal area of ​​the paint booth into upper and lower sections. In the area below the partition plate, there is an under-booth space that is connected in a flow path to the paint mist removal device. In the partition plate, openings are formed on both sides of the transport path to allow the booth air to flow into the space under the booth floor. The opening has a vertical dimension that is long in the longitudinal direction of the booth and a horizontal dimension that is short in the width direction of the booth. The space beneath the booth floor guides the booth air that has passed through the opening in the width direction of the booth and supplies it to the paint mist removal device. A dry coating equipment characterized by the following features.

2. The dry coating equipment according to claim 1, characterized in that the aspect ratio of the opening is 2.0 or more and less than 5.

0.

3. The dry coating equipment according to claim 2, characterized in that the air velocity of the booth air passing through the opening is 0.5 m / s or more and 3.0 m / s or less.

4. The dry coating equipment according to claim 3, characterized in that the opening is a first opening located far from the paint mist removal device and a second opening located close to the paint mist removal device, and the first opening and the second opening are spaced at least 1500 mm apart.

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