Coating equipment

Abstract

A coating apparatus (10) is provided with a coating chamber (11) in which an object (W1) to be coated is coated while being conveyed in the longitudinal direction of a coating line (14), and a coating mist removal device (30) having a filter housing body (31) capable of housing a primary filter (40) and a secondary filter (60), the primary filter (40) and the secondary filter (60) being disposed in the coating chamber (11), and the secondary filter (60) being disposed in the filter housing body (31). The spray air (A2) discharged from the spray space (S1) flows through the primary filter (40) and the secondary filter (60) accommodated in the filter accommodating body (31), so that the spray air (A2) contained in the spray air (A2) is removed. The coating fogdrop removing device (30) is arranged at an offset position in the width direction of the coating line (14) in a manner of avoiding an under-floor space (S2) of the coating and spraying room. By the adoption of the coating equipment, the overall height of the coating spraying chamber can be reduced, and the filter can be replaced conveniently.

Description

TECHNICAL FIELD

[0001] The present application relates to a painting device provided with a painting booth for painting a painting target, and a paint mist removing device for removing paint mist in the painting booth. BACKGROUND

[0002] Conventionally, a painting device for painting a painting target such as a vehicle body is known. For example, as shown in FIG. 15 , it has been proposed to provide a paint mist removing device 104 in a painting device 101 in a floor under space 103 of a painting booth 102 (for example, refer to Patent Document 1). The paint mist removing device 104 has a filter housing body 107 that can house a primary filter 105 and a secondary filter 106, and is used to remove paint mist in spray air A1 discharged from a spray space 108 of the painting booth 102. In addition, the primary filter 105 discharges the spray air A1 sucked from above (the spray space 108 side) to the left (right side in FIG. 15 ). And, the secondary filter 106 is connected and arranged to the side of the primary filter 105.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-133269

[0004] However, since the paint mist removing device 104 is provided in the painting booth floor under space 103, the worker must enter the painting booth floor under space 103 to perform maintenance work such as filter replacement on the paint mist removing device 104. In this case, the painting booth floor under space where the worker easily enters needs to be raised, resulting in an increase in the overall height of the painting booth 102, and there is a problem that the installation site is limited.

[0005] In addition, as shown in FIG. 15 , a discharge duct 109 for discharging the spray air A1 to the outside of the painting device 101 is provided to the side of the secondary filter 106 (right side in FIG. 15 ). In this case, the worker can only perform maintenance on the paint mist removing device 104 on the opposite side of the discharge duct 109 (left side in FIG. 15 ). Furthermore, when replacing the secondary filter 106, the primary filter 105 must be removed from the paint mist removing device 104 before the secondary filter 106 is removed from the paint mist removing device 104, so there is a problem that the filter replacement work is complicated. SUMMARY

[0006] The present application is to solve the above problems, and aims to provide a painting device that can reduce the overall height of the painting booth and facilitate filter replacement.

[0007] To solve the above problems, the first coating device provided by the present application has: a coating spray booth having a pair of side walls and a floor portion, a spray space being divided above the floor portion, a floor space below the floor portion, and a conveying path for conveying a coated object along the length direction of the coating line; and a paint mist removing device having a filter container capable of containing a primary filter and a secondary filter, paint mist in the spray air being removed by making the spray air flow through the primary filter and the secondary filter contained in the filter container. The paint mist removing device is arranged at a position offset from the coating line in the width direction, avoiding the floor space below the floor of the spray booth.

[0008] The first coating device provided by the present application has the paint mist removing device arranged at a position offset from the coating line in the width direction, avoiding the floor space below the floor of the spray booth. Thus, the height of the floor space below the floor of the spray booth can be reduced to a level that does not need to consider the height of the paint mist removing device, and the overall height of the coating spray booth can be reduced. Therefore, the installation freedom of the coating spray booth is greatly improved. In addition, when replacing the primary filter and the secondary filter contained in the filter container of the paint mist removing device, the operator does not need to enter the floor space below the floor of the spray booth. Therefore, the replacement work of the primary filter and the secondary filter can be easily performed.

[0009] The second coating device provided by the present application is based on the first coating device, and the paint mist removing device is arranged at a position spaced apart from the side wall.

[0010] The third coating device provided by the present application is based on the second coating device, and an exhaust duct is connected to the outlet of the filter container, the exhaust duct being arranged at a position offset from the coating line in the width direction, avoiding the floor space below the floor of the spray booth.

[0011] The third coating device provided by the present application has the exhaust duct arranged at a position offset from the coating line in the width direction, avoiding the floor space below the floor of the spray booth. Thus, the height of the floor space below the floor of the spray booth can be reduced to a level that does not need to consider the height of the exhaust duct, and the overall height of the coating spray booth can be reduced. Therefore, the installation freedom of the coating spray booth is greatly improved.

[0012] The fourth coating device provided by the present application is based on the first coating device, and the primary filter and the secondary filter are arranged in an up-down adjacent manner in the filter container.

[0013] The fourth coating device provided by the present application has no other structure connected to the side of the filter housing, so when replacing any one of the primary filter and the secondary filter, the replacement of the filter will not be hindered by other structures, and the replacement operation can be smoothly performed. In addition, by adjacently arranging the primary filter and the secondary filter in an up-down manner, the installation area of the filter housing (the paint mist removal device) can be reduced, thereby greatly improving the installation freedom of the paint mist removal device.

[0014] The fifth coating device provided by the present application is based on the fourth coating device, and the filter housing has a lower side housing portion and an upper side housing portion, the lower side housing portion can accommodate the primary filter which can be freely taken and placed, and the upper side housing portion can accommodate the secondary filter which can be freely taken and placed.

[0015] The fifth coating device provided by the present application has the primary filter and the secondary filter both being detachable, so the operator can clean the filter housing in the state that the primary filter and the secondary filter are detached. Therefore, the cleaning operation efficiency of the filter housing can be improved.

[0016] The sixth coating device provided by the present application is based on the fifth coating device, and the filter housing has a flow inlet for introducing the spraying air into the primary filter in the lower side housing portion, and a flow outlet for discharging the spraying air that has passed through the secondary filter in the upper side housing portion.

[0017] The sixth coating device provided by the present application has the filter housing having the flow inlet and the flow outlet, so the spraying air can be guided to flow through the flow inlet, the primary filter, the secondary filter and the flow outlet in sequence. In addition, when the flow outlet of the filter housing is connected with an exhaust pipeline, the exhaust pipeline will be located at the upper part of the filter housing, and will not hinder the operator.

[0018] The seventh coating device provided by the present application is based on any one of the first to sixth coating devices, and the air conveying flow path connecting the spraying space and the paint mist removal device is formed in the space below the floor of the spraying chamber, and the dust collecting portion for removing the paint mist contained in the spraying air is arranged in the middle of the air conveying flow path.

[0019] The seventh coating device provided by the present application has the spraying air colliding with the inner side surface of the dust collecting portion, and the paint mist contained in the spraying air will adhere to the inner side surface of the dust collecting portion, so that the dust collecting treatment of the paint mist can be performed.

[0020] The eighth coating device provided by the present application is based on the seventh coating device, and the air conveying flow path comprises: a downward pipe extending downward from the center of the floor; a flow direction changing part connected with the end of the downward pipe and used for changing the flow direction of the spraying air; and a transverse pipe connected with the flow direction changing part and extending in the transverse direction towards the paint mist removing device; the dust collecting part is arranged at the flow direction changing part, and a flow regulating part is formed on the transverse pipe, and the bottom surface of the flow regulating part has a slope gradually decreasing towards the flow direction changing part.

[0021] The eighth coating device provided by the present application is based on the seventh coating device, and the air conveying flow path comprises: a downward pipe extending downward from the center of the floor; a flow direction changing part connected with the end of the downward pipe and used for changing the flow direction of the spraying air; and a transverse pipe connected with the flow direction changing part and extending in the transverse direction towards the paint mist removing device; the dust collecting part is arranged at the flow direction changing part, and a flow regulating part is formed on the transverse pipe, and the bottom surface of the flow regulating part has a slope gradually decreasing towards the flow direction changing part.

[0022] The ninth coating device provided by the present application is based on the eighth coating device, and a liquid accumulation groove is arranged at the lower part of the dust collecting part.

[0023] The ninth coating device provided by the present application is based on the eighth coating device, and a liquid accumulation groove is arranged at the lower part of the dust collecting part.

[0024] As described above in detail, the first to ninth coating devices provided by the present application can provide a coating device which can reduce the overall height of the coating spraying chamber and facilitate the replacement of filters. BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1 FIG. 1 is a schematic sectional view of the coating device of the present embodiment. FIG. 2 FIG. 2 is a front view of the paint mist removing device. FIG. 3 FIG. 3 is a sectional view of the paint mist removing device. FIG. 4 FIG. 4 is a sectional view of the lower side accommodating part and the corrugated paper filter. FIG. 5 FIG. 5 is a sectional view of the upper side accommodating part and the secondary filter. FIG. 6 FIG. 6 is a schematic sectional view showing the taking and placing state of the corrugated paper filter and the secondary filter in the filter accommodating body. FIG. 7 FIG. 7 is a perspective view of the paint mist removing device showing the open state of the door body. FIG. 8A cross-sectional view of a paint mist removing device of another embodiment. FIG. 9 A schematic cross-sectional view of an air conveying flow path of another embodiment. FIG. 10 A schematic cross-sectional view of an air conveying flow path of another embodiment. FIG. 11 A schematic cross-sectional view of an air conveying flow path of another embodiment. FIG. 12 A schematic cross-sectional view of a painting apparatus of another embodiment. FIG. 13A A schematic cross-sectional view of a painting apparatus of another embodiment. FIG. 13B A cross-sectional view along line A-A in FIG. 13A FIG. 14 A schematic cross-sectional view of a painting apparatus of another embodiment. FIG. 15 A schematic cross-sectional view of a painting apparatus of the related art. DETAILED DESCRIPTION

[0026] Hereinafter, one embodiment of the present application will be described in detail based on the drawings.

[0027] As shown in FIG. 1 , a painting apparatus 10 of the present embodiment is provided with a painting booth 11 and a paint mist removing device 30. The painting booth 11 is provided with a pair of side walls 12 and a floor portion 13. Above the floor portion 13 of the painting booth 11, a painting space SI is demarcated, and below the floor portion 13 of the painting booth 11, a painting booth floor lower space S2 is demarcated. Further, in the painting space SI, a painting line 14 extending in the lengthwise direction (a direction perpendicular to the plane of the drawing) is housed, and a plurality of painting robots 15 are arranged laterally to the painting line 14. Also, the painting booth 11 sprays paint (paint mist) to an object to be painted Wl (an automobile in the present embodiment) in the painting space SI by means of the painting robots 15, and conveys the object to be painted Wl in the lengthwise direction of the painting line 14, thereby painting the object to be painted Wl. FIG. 1

[0028] Further, a ceiling 16 is provided in the upper portion of the painting space SI. The ceiling 16 is configured to supply clean air A2 to the upper side. As a result, the clean air A2 flows into the painting booth 11 through the ceiling 16 and flows downward, thereby guiding the paint mist that is not attached to the object to be painted Wl downward. On the other hand, an exhaust port 18 is provided in the center of the floor portion 13.

[0029] As shown in FIG. 1 ​​As shown, an air transport path 21 connecting the spraying space S1 and the paint droplet removal device 30 is formed in the space S2 under the floor of the spray booth. The air transport path 21 includes a downflow pipe 22, a flow direction changing section 23, and a transverse pipe 24. The downflow pipe 22 has a rectangular cross-section and extends downwards from the outlet 18 located in the center of the floor section 13. The flow direction changing section 23 is box-shaped and connected to the end of the downflow pipe 22. The flow direction changing section 23 is used to change the flow direction of the spraying air A2 flowing through the downflow pipe 22 from downwards to transverses. FIG. 1 (Right-middle direction). Furthermore, the cross-section of the transverse pipe 24 is rectangular, its starting end connected to the flow direction changing section 23, and its ending end connected to the paint droplet removal device 30 via the connecting pipe 25. The transverse pipe 24 penetrates the side wall 12 and protrudes towards the outside of the coating spraying chamber 11 (outside the space S2 under the floor of the spraying chamber), towards the paint droplet removal device 30 (…). FIG. 1 Extending laterally (in the right-center direction). Furthermore, the cross-section of the connecting pipe 25 is rectangular, extending towards the paint mist removal device 30 (in the right-center direction). FIG. 1 (From the right-center direction) Extends laterally.

[0030] like FIG. 1 As shown, a dust collection section 26 is provided midway through the air transport path 21, at the flow direction change section 23. The dust collection section 26 removes (collects) paint droplets by causing the sprayed air A2 flowing through the downflow pipe 22 to collide with its inner surface (especially the bottom surface), causing some of the paint droplets contained in the sprayed air A2 to adhere to the bottom surface. Furthermore, on the side of the dust collection section 26, specifically on the side opposite to the connection portion with the transverse pipe 24... FIG. 1 The left side of the middle section is provided with a gate valve 27 for blocking the inside and outside of the dust collection section 26.

[0031] like FIG. 1 , FIG. 3 As shown, the paint droplet removal device 30 avoids the space S2 under the floor of the painting spray booth 11 and is set in the width direction of the painting line 14. FIG. 1 The paint droplet removal device 30 is positioned offset from the side wall 12 of the coating spray chamber 11. Specifically, the paint droplet removal device 30 is separated from the side wall 12 by a distance equal to the sum of "half the length of the transverse duct 24 of the air delivery path 21" and "the length of the connecting duct 25".

[0032] The paint mist removing device 30 is a device that removes paint mist contained in the spray air A2 by flowing the spray air A2 discharged from the spray space S1 of the painting booth 11 therethrough. Specifically, the filter housing 31 has a lower housing portion 32 and an upper housing portion 33 disposed in the upper side of the lower housing portion 32. The lower housing portion 32 freely houses the corrugated paper filter 40 (primary filter) (refer to FIG. 6 , FIG. 7 ), and the upper housing portion 33 freely houses the secondary filters 60 (refer to FIG. 6 ). In addition, the corrugated paper filter 40 and the secondary filters 60 are disposed in the upper and lower sides of the filter housing 31. Further, the height of the filter housing 31 is set to be higher than the height of the spray booth floor under space S2 of the painting booth 11. In addition, the height of the lower housing portion 32 is set to be higher than the height of the spray booth floor under space S2. Further, the upper housing portion 33 is disposed above the floor portion 13 of the painting booth 11.

[0033] As shown in FIG. 3 to FIG. 6 , the flow inlet 35 is provided in the side surface 34 of the filter housing 31 (specifically, in the portion of the side surface 34 on the opposite side of the opening portion of the lower housing portion 32). The flow inlet 35 is connected to the end of the connection pipe 25. The flow inlet 35 is used to introduce the spray air A2 into the corrugated paper filter 40 in the lower housing portion 32. In addition, the flow outlet 36 is provided in the filter housing 31 at a position different in height from the flow inlet 35 (specifically, in the upper end portion of the filter housing 31). The flow outlet 36 is used to discharge the spray air A2 that has passed through the secondary filters 60 in the upper housing portion 33.

[0034] In addition, the corrugated paper filter 40 is formed mainly of a combustible material (specifically, corrugated paper). As shown in FIG. 3 , FIG. 4 , FIG. 6 , FIG. 7 , the corrugated paper filter 40 includes a filter main body 41 and an upper cover portion 42. The filter main body 41 is in a rectangular parallelepiped shape (box shape) and has an upper face 43, a lower face 44, and four side surfaces 45. Further, the filter main body 41 is provided with an inlet 46 having a rectangular opening in the side surface 45 on the right side in the upstream side FIG. 4 , and is provided with an outlet 47 having a rectangular opening in the upper face 43. In addition, the upper cover portion 42 covers the portion of the upper face 43 of the filter main body 41 other than the outlet 47. In the filter main body 41 of the present embodiment, the spray air A2 containing paint mist flows into the inside from the inlet 46 and is discharged from the outlet 47. Further, the spray air A2 discharged from the outlet 47 is introduced into the upper housing portion 33.

[0035] As shown in FIG. 4As shown, the filter body 41 includes a separating filter element 48 and a flow straightener 49. The separating filter element 48 is housed near the inlet 46 within the filter body 41. The separating filter element 48 is composed of multiple plate-shaped separating filter element units 50 arranged side by side, and has the function of separating paint droplets in the sprayed air A2. Each separating filter element unit 50 extends vertically, and its lower end contacts the bottom surface 51 of the filter body 41. Furthermore, the bottom surface 51 is parallel to the upper surface 43 and the lower surface 44 of the filter body 41. In addition, each separating filter element unit 50 is corrugated in the top view. Thus, a serpentine flow path is formed between adjacent separating filter element units 50.

[0036] Furthermore, the rectifier plate 49 is housed near the outlet 47 within the filter body 41. The rectifier plate 49 is composed of multiple rectifier plate units 52 arranged side-by-side. Each rectifier plate unit 52 extends vertically, with its lower end contacting the bottom surface 51 of the filter body 41. Additionally, each rectifier plate unit 52 extends horizontally (…). FIG. 4 It extends in the left-right direction, and its upstream end is connected to the downstream end of the separation filter element unit 50.

[0037] like FIG. 4 As shown, the rectifier plate 49 includes four guide plates 53 that connect the rectifier plate units 52 to each other. Each guide plate 53 is perpendicular to each rectifier plate unit 52 and extends horizontally. FIG. 4 (The middle extends in the depth direction). Furthermore, each guide plate 53 is inclined relative to the upper 43, lower 44 and bottom 51 of the filter body 41, and has the function of guiding the sprayed air A2 introduced from the inlet 46 and passing through the separation filter element 48 to the outlet 47.

[0038] like FIG. 2 to FIG. 4 , FIG. 6 As shown, at the bottom of the downflow duct 22, multiple rollers 54 are rotatably arranged at predetermined intervals. The rotation axis of each roller 54 is related to the loading / unloading direction of the corrugated paper filter 40. FIG. 6 The rollers 54 are perpendicular to each other in the left-right direction. Furthermore, the dimension of each roller 54 in the rotation axis direction is set smaller than the dimension of the corrugated paper filter 40 in the depth direction. All rollers 54 are arranged at the same height and aligned in a straight line along the loading and unloading direction of the corrugated paper filter 40. Thus, the outer peripheral surface of each roller 54 contacts the lower surface 44 of the corrugated paper filter 40, supporting the corrugated paper filter 40 from below. In addition, each roller 54 rotates during the handling of the corrugated paper filter 40, facilitating its smooth movement.

[0039] like FIG. 3 , FIG. 4 , FIG. 6As shown, a pressing member 55 is provided on the upper inner surface of the downflow pipe 22, which can abut against the upper surface 43 of the filter body 41. Specifically, the pressing member 55 is a rod-shaped member with an L-shaped cross-section, and is positioned to abut against the upper surface 42a of the upper cover 42. Furthermore, the pressing member 55 is detachable from the downflow pipe 22.

[0040] like FIG. 3 , FIG. 5 to FIG. 7 As shown, the secondary filter 60 includes two sheet-like filter elements 61, a filter frame 62, and a pair of mesh components 63. The sheet-like filter elements 61 are primarily made of a combustible material (specifically, fire-retardant paper) and are formed into rectangular plates. The sheet-like filter elements 61 allow the spray air A2 discharged from the corrugated paper filter 40 to pass through, thereby removing paint droplets contained in the spray air A2. Furthermore, the filter frame 62 is rectangular and holds the outer periphery of the two sheet-like filter elements 61. The outer periphery of each mesh component 63 is held by the filter frame 62, supporting the air inflow side (not shown) and air outflow side 61a of the sheet-like filter elements 61, respectively. This prevents the sheet-like filter elements 61 from detaching from the filter frame 62.

[0041] like FIG. 5 , FIG. 7 As shown, three secondary filter mounting parts 64 are housed within the upper receiving portion 33. Each secondary filter mounting part 64 is arranged laterally ( FIG. 5 The secondary filters are arranged side-by-side in a left-right direction. Furthermore, each secondary filter mounting section 64 is mountain-shaped, with two sides (…). FIG. 5 The secondary filters 60 are inclined surfaces 65 (left and right sides). Therefore, by tightly fitting the secondary filters 60 onto each inclined surface 65, a pair of secondary filters 60 can be installed on the secondary filter mounting portion 64 in a gradually upward, mutually approaching manner. At this time, the airflow side of the sheet filter element 61 faces the inclined surface 65.

[0042] A press-holding member 66 is provided at the upper end of each secondary filter mounting section 64. The press-holding member 66 is formed by bending a rectangular metal plate, and its cross-section is approximately U-shaped. The press-holding member 66 is used to hold the upper part of the filter frame 62 of a pair of secondary filters 60 mounted on the secondary filter mounting section 64. This allows each secondary filter 60 to fit tightly against the secondary filter mounting section 64. Furthermore, the central part of the press-holding member 66 is connected to the upper end of the secondary filter mounting section 64 by a bolt 67. By screwing a nut 68 onto the front end of the bolt 67, the press-holding member 66 and the secondary filter mounting section 64 can be fixed together. This secures each secondary filter 60 mounted on the secondary filter mounting section 64.

[0043] like FIG. 3 , FIG. 5, FIG. 6 As shown, an airflow regulating plate 69 is provided on the upper part of the upper receiving section 33 for regulating the airflow of the spray air A2 that passes through each secondary filter 60. In addition, the airflow regulating plate 69 can regulate the airflow of the spray air A2 by moving a baffle (moving along the plate surface direction of the airflow regulating plate 69) that forms part of the airflow regulating plate 69, or by removing the baffle.

[0044] like FIG. 2 , FIG. 3 , FIG. 7 As shown, the filter housing 31 has a door 70 consisting of a pair of rotating doors 71 on a side 37 opposite to the side 34 where the inlet 35 is located (i.e., the side 37 where the openings of the lower housing 32 and the upper housing 33 are located). The rotating doors 71 are rotatably connected by multiple hinges 72 provided on the side 37, respectively blocking half of the opening of the lower housing 32 and half of the opening of the upper housing 33. Furthermore, the door 70 in this embodiment is a shared door for facilitating the placement and removal of the lower housing 32 and the corrugated paper filter 40, as well as the upper housing 33 and the secondary filter 60. When the door 70 is open, the corrugated paper filter 40 and the secondary filter 60 can be replaced.

[0045] like FIG. 2 As shown, among the revolving doors 71 that constitute the door body 70, one of the revolving doors 71 ( FIG. 2 A pair of locking parts 73 are provided on the front of the right side of the door. Furthermore, on the side where the locking parts 73 are provided, the revolving door 71 ( FIG. 2 A pair of latches 74 are provided on the front of the left side of the door. The latches 74 are rotatably supported on the revolving door 71 and have an operating handle 75 and an actuating rod 76. Thus, when the operating handle 75 is rotated, the actuating rod 76 will enter the locking part 73, thereby keeping the pair of revolving doors 71 in the closed state.

[0046] like FIG. 1 As shown, the outlet 36 of the filter housing 31 (refer to...) FIG. 3 , FIG. 5 , FIG. 6 The upward duct 81 is connected to the beginning of the upward duct 81. The upward duct 81 has a rectangular cross-section and extends upward from the outlet 36. Furthermore, the end of the upward duct 81 is connected to the exhaust duct 82, which is used to discharge the spraying air A2 that has passed through the outlet 36 and flowed through the upward duct 81. Additionally, the upward duct 81 and the exhaust duct 82 avoid the space S2 under the floor of the coating chamber 11 and are positioned in the width direction of the coating line 14. FIG. 1The upper flow path 81 and the exhaust flow path 82 are arranged at a position offset to the right of the center of the painting booth 11. Further, the upper flow path 81 and the exhaust flow path 82 are arranged at a distance from the side wall 12 of the painting booth 11, and the distance is the sum of "half the length of the lateral flow path 24 of the air delivery flow path 21" and "the length of the connection flow path 25". Furthermore, the upper flow path 81 and the exhaust flow path 82 are arranged above the floor portion 13 of the painting booth 11 and are connected to the upper side of the paint mist removing device 30 (the filter housing 31).

[0047] Further, the air delivery flow path 21, the filter housing 31, the upper flow path 81, and the exhaust flow path 82 are in a state of negative pressure, which is not shown in the drawings. Thus, the painting air A2 in the painting booth 11 flows to the paint mist removing device 30 after passing through the air delivery flow path 21. Further, the paint mist contained in the painting air A2 is removed when passing through the dust collecting portion 26 and the paint mist removing device 30.

[0048] Next, the method of removing the paint mist contained in the painting air A2 will be described.

[0049] First, when the painting robot 15 sprays paint to paint the object W1, excess paint mist is guided to the painting booth floor under space S2 side through the exhaust port 18 of the floor portion 13 of the painting booth 11 along with the painting air A2 in the painting space S1.

[0050] After that, the painting air A2 containing the paint mist flows through the lower flow path 22 of the air delivery flow path 21 formed in the painting booth floor under space S2 and is guided to the flow direction changing portion 23 (the dust collecting portion 26). At this time, the painting air A2 collides with the inner side surface (particularly, the bottom surface) of the dust collecting portion 26, and part of the paint mist contained in the painting air A2 adheres to the inner side surface. Thus, the dust collecting portion 26 performs dust collecting treatment on the paint mist. Further, after the painting air A2 collides with the inner side surface of the dust collecting portion 26 (the flow direction changing portion 23), the flow direction thereof is changed from the lower side to the lateral side (to the right of the center). FIG. 1 After that, the painting air A2 whose flow direction has been changed flows into the lateral flow path 24 of the air delivery flow path 21. Then, the painting air A2 that has flowed through the lateral flow path 24 is sucked into the filter main body 41 after passing through the connection flow path 25, the inflow port 35 of the filter housing 31 (the paint mist removing device 30), and the inlet 46 of the corrugated paper filter 40 (the filter main body 41) in the lower housing portion 32 in this order (see FIG. 4). FIG. 4

[0051] ​Subsequently, the spray air A2 is guided to the separation filter 48, and flows between the adjacent separation filter units 50. Since each separation filter unit 50 is corrugated in plan view, a serpentine flow path is formed between the adjacent separation filter units 50. As a result, the spray air A2 collides with the surfaces of the separation filter units 50 while flowing in the serpentine flow path, and most of the paint mist contained in the spray air A2 is removed by being attached to the surfaces of the separation filter units 50.

[0052] Next, the spray air A2 that has passed through the separation filter 48 is guided to the rectifier plate 49 on the downstream side of the separation filter 48 (left side in the figure), and flows between the adjacent three rectifier plate units 52. At this time, the spray air A2 comes into contact with the surfaces of the rectifier plate units 52 and flows guided by the surfaces of the rectifier plate units 52. As a result, the flow of the spray air A2 becomes uniform. In addition, part of the paint mist contained in the spray air A2 is removed by being attached to the surfaces of the rectifier plate units 52. Further, the spray air A2 comes into contact with the surface of the guide plate 53, and its flow direction is changed from the lateral direction (leftward direction in the figure) to the upward direction. At this time, part of the paint mist contained in the spray air A2 is removed by being attached to the surface of the guide plate 53. FIG. 4 FIG. 4 After that, the spray air A2 is discharged from the outlet 47 to the outside of the filter main body 41, and is guided to the inside of the upper housing portion 33. Then, the spray air A2 is guided to the inside space S3 (see FIG. 6) of the secondary filter mounting portion 64 provided in the upper housing portion 33, and flows from the air inflow side surface side of the sheet filter element 61 in the secondary filter 60 to the air outflow side surface 61a side (see FIG. 6). At this time, the paint mist contained in the spray air A2 is removed by being attached to the air inflow side surface and the like of the sheet filter element 61. In this way, the paint mist contained in the spray air A2 is completely removed.

[0053] After that, the spray air A2 is discharged from the outlet 47 to the outside of the filter main body 41, and is guided to the inside of the upper housing portion 33. Then, the spray air A2 is guided to the inside space S3 (see FIG. 6) of the secondary filter mounting portion 64 provided in the upper housing portion 33, and flows from the air inflow side surface side of the sheet filter element 61 in the secondary filter 60 to the air outflow side surface 61a side (see FIG. 6). At this time, the paint mist contained in the spray air A2 is removed by being attached to the air inflow side surface and the like of the sheet filter element 61. In this way, the paint mist contained in the spray air A2 is completely removed. FIG. 5 FIG. 3 After that, the spray air A2 is discharged from the outlet 47 to the outside of the filter main body 41, and is guided to the inside of the upper housing portion 33. Then, the spray air A2 is guided to the inside space S3 (see FIG. 6) of the secondary filter mounting portion 64 provided in the upper housing portion 33, and flows from the air inflow side surface side of the sheet filter element 61 in the secondary filter 60 to the air outflow side surface 61a side (see FIG. 6). At this time, the paint mist contained in the spray air A2 is removed by being attached to the air inflow side surface and the like of the sheet filter element 61. In this way, the paint mist contained in the spray air A2 is completely removed.

[0054] Subsequently, the spray air A2 from which the paint mist has been removed passes through the air volume adjusting plate 69 in the upper housing portion 33, and is discharged from the flow outlet 36 to the outside of the filter housing 31. Then, the spray air A2 flows through the upflow duct 81, and is discharged to the outside of the painting equipment 10 through the exhaust duct 82.

[0055] Therefore, the present embodiment can achieve the following effects.

[0056] ​​(1) In the coating device 10 of the present embodiment, the paint mist removing device 30 is provided at a position offset from the spray booth floor lower space S2 of the coating spray booth 11 in the width direction of the coating line 14. Thereby, the height of the spray booth floor lower space S2 can be reduced to a level that does not require consideration of the height of the paint mist removing device 30 (for example, to 1100 mm, which is lower than the height of the general worker O1), and further, the overall height of the coating spray booth 11 can be reduced. Thus, the degree of freedom in installation of the coating spray booth 11 is greatly improved. Further, the worker O1 (refer to FIG. 1 ) does not need to enter the spray booth floor lower space S2 when replacing the corrugated paper filter 40 and the secondary filter 60 housed in the filter housing body 31 of the paint mist removing device 30. Thus, the replacement work of the corrugated paper filter 40 and the secondary filter 60 can be easily performed.

[0057] (2) In the present embodiment, the paint mist removing device 30 is provided at a position separated from the side wall 12 of the coating spray booth 11, and thus the paint mist removing device 30 can be provided at a position that does not interfere with the coating spray booth 11. Further, the corrugated paper filter 40 and the secondary filter 60 are arranged in the filter housing body 31 of the paint mist removing device 30 in an up-and-down manner. Thereby, when replacing any one of the corrugated paper filter 40 and the secondary filter 60, the replacement of the filter is not hindered by other structures (for example, the coating spray booth 11), and the replacement work can be smoothly performed.

[0058] (3) In the present embodiment, the corrugated paper filter 40 and the secondary filter 60 are arranged in an up-and-down manner, and the upflow duct 81 and the exhaust duct 82 are connected to the upper side of the filter housing body 31. Thereby, the installation area of the filter housing body 31 (paint mist removing device 30), the upflow duct 81, and the exhaust duct 82 can be reduced. Due to the reduction in the installation area, the degree of freedom in installation of the paint mist removing device 30 is greatly improved.

[0059] (4) In the present embodiment, the paint mist contained in the spray air A2 collides with the inner side surface of the dust collecting portion 26, and the paint mist adheres to the inner side surface of the dust collecting portion 26, and thus the paint mist can be subjected to the dust collecting treatment. Thereby, part of the paint mist in the spray air A2 can be removed before the spray air A2 is introduced into the paint mist removing device 30. Thus, the burden on the paint mist removing device 30 can be reduced.

[0060] (5) In the present embodiment, the bottom surface 94 (the rectifying portion 93) of the lateral duct 24 has a slope that gradually decreases toward the flow direction changing portion 23. Thus, when the cleaning liquid is flowed into the lateral duct 24 on the side close to the paint mist removing device 30 for cleaning (e.g., high-pressure cleaning), the paint mist adhered to the bottom surface 94 of the lateral duct 24 is carried toward the flow direction changing portion 23 by the cleaning liquid. Therefore, the inside of the air conveying flow path 21 is easily cleaned. Further, a sump 95 is provided at the lower portion of the dust collecting portion 26 (the flow direction changing portion 23). Thus, the paint mist accumulated in the dust collecting portion 26 is collected in the sump 95, and thus the inside of the air conveying flow path 21 is easily cleaned.

[0061] Further, the above-described embodiment can be modified as follows.

[0062] In the filter housing 31 (the paint mist removing device 30) of the above-described embodiment, the corrugated paper filter 40 is housed in the lower housing portion 32 and the secondary filter 60 is housed in the upper housing portion 33, but as shown in FIG. 6, the secondary filter 60 can be housed in the lower housing portion 32 and the corrugated paper filter 40 can be housed in the upper housing portion 33. In this case, the spray air A2 flowing through the lateral duct 24 of the air conveying flow path 21 is, after flowing through the connecting duct 25, drawn into the filter body 41, for example, in the order of the inflow port 91 of the filter housing 31, the inlet 46 of the corrugated paper filter 40 in the upper housing portion 33. Subsequently, the spray air A2 is discharged from the outlet (not shown in the figure) provided in the lower face 44 of the filter body 41 to the outside of the filter body 41, and is guided into the lower housing portion 32. Then, the spray air A2 passes through the sheet filter element 61 of the secondary filter 60 provided in the lower housing portion 32. Thereafter, the spray air A2 is discharged from the outflow port 92 to the outside of the filter housing 31. FIG. 8 As shown in FIG. 7, in the lateral duct 24 of the air conveying flow path 21, a rectifying portion 93 can be formed, and the bottom surface 94 of the rectifying portion 93 can have a slope that gradually decreases toward the flow direction changing portion 23. In this case, when the lateral duct 24 is contaminated, the cleaning liquid is flowed into the lateral duct 24 on the side close to the paint mist removing device 30 for cleaning (e.g., high-pressure cleaning), and the paint mist adhered to the bottom surface 94 of the lateral duct 24 is carried toward the flow direction changing portion 23 by the cleaning liquid. Therefore, the inside of the air conveying flow path 21 is easily cleaned. Further, a sump 95 is provided at the lower portion of the dust collecting portion 26 (the flow direction changing portion 23). Thus, the paint mist accumulated in the dust collecting portion 26 is collected in the sump 95, and thus the inside of the air conveying flow path 21 is further easily cleaned.

[0063] FIG. 9 As shown in FIG. 7, in the lateral duct 24 of the air conveying flow path 21, a rectifying portion 93 can be formed, and the bottom surface 94 of the rectifying portion 93 can have a slope that gradually decreases toward the flow direction changing portion 23. In this case, when the lateral duct 24 is contaminated, the cleaning liquid is flowed into the lateral duct 24 on the side close to the paint mist removing device 30 for cleaning (e.g., high-pressure cleaning), and the paint mist adhered to the bottom surface 94 of the lateral duct 24 is carried toward the flow direction changing portion 23 by the cleaning liquid. Therefore, the inside of the air conveying flow path 21 is easily cleaned. Further, a sump 95 is provided at the lower portion of the dust collecting portion 26 (the flow direction changing portion 23). Thus, the paint mist accumulated in the dust collecting portion 26 is collected in the sump 95, and thus the inside of the air conveying flow path 21 is further easily cleaned.

[0064] ​In the above embodiment, the dust collection unit 26 is provided at the flow direction changing unit 23, but the dust collection unit 26 can also be provided at other locations. For example, FIG. 10 As shown, the dust collection unit 26 can be installed at the end of the transverse pipe 24 of the air conveying path 21. Furthermore, in this case, it is preferable to install a blocking component 96 (e.g., a gate valve, baffle, etc.) between the dust collection unit 26 and the paint droplet removal device 30 to prevent them from entering the paint droplet removal device 30.

[0065] like FIG. 11 As shown, the dust collection section 26 of the air delivery path 21 may also house a filter 97 for removing paint droplets contained in the spray air A2. Furthermore, the filter 97 may be, for example, a rectangular (box-shaped) corrugated paper filter. The filter 97 has: an inlet for drawing in the spray air A2 discharged from the spraying space S1; and an inlet for changing the flow direction of the spray air A2 from downward to horizontal (…). FIG. 11 A rectifier plate (in the middle right direction); and an outlet for discharging spray air A2 to the transverse duct 24.

[0066] In the above embodiment, the exhaust duct 82 avoids the space under the floor of the spray booth, is located at an offset position in the width direction of the coating line 14, and is positioned above the floor portion 13 of the coating spray booth 11. Furthermore, as... FIG. 12 As shown, the exhaust pipe 82 can also be positioned below the floor section 13.

[0067] In the above embodiment, the outlet 18 for supplying spray air A2 is only located at the center of the floor portion 13, but the outlet 18 can also be located at multiple locations on the floor portion 13, for example, FIG. 13A As shown, the outlet 18 can also be located at two points on the floor 13. Furthermore, as... FIG. 13B As shown, multiple outlets 18 can be provided along the length of the coating line 14 (the conveying direction of the workpiece W1). Alternatively, instead of providing outlets 18, the floor section 13 can be made with a grid structure, allowing the spraying air A2 to pass through the entire floor section 13.

[0068] In the above embodiment, an air transport path 21 is formed within the space S2 beneath the floor of the spray booth. Furthermore, as... FIG. 14 As shown, the air delivery path 98 can also be positioned at an offset location in the width direction of the coating line 14, avoiding the spraying space S1. Specifically, it can be positioned to the side of the side wall 12 of the coating spraying chamber 11. FIG. 14 (Right side). Furthermore, the paint droplet removal device 30 can be positioned offset in the width direction of the coating line 14, avoiding the spraying space S1, and at the same height as the floor portion 13. This reduces the overall height of the coating spraying chamber 11.

[0069] In the above embodiment, a plurality of paint mist removing devices 30 can be provided along the length direction of the coating line 14 (the conveying direction of the coated article Wl) (see FIG. 1). By this, a large amount of spray air A2 can be treated. FIG. 13B

[0070] The paint mist removing device 30 of the above embodiment has a filter housing 31 which can house the corrugated paper filter 40 (primary filter) and the secondary filter 60. Further, the filter housing 31 can also house a tertiary filter or more.

[0071] The downcomer 22, the cross pipe 24, the connecting pipe 25 and the upcomer 81 of the above embodiment have a rectangular cross section, but can have a circular cross section, a triangular cross section or other cross section shape.

[0072] In the above embodiment, the coated article Wl coated in the coating booth 11 is exemplified by a car body, but is not limited thereto. For example, the coated article can be an instrument panel, a door panel, an armrest or other interior member for a car, or an exterior member for a car having a decorative member such as a bumper. Further, the coated article Wl is not necessarily a member for a car.

[0073] Next, the technical ideas described in the summary of the invention and the technical ideas which can be understood from the above embodiment are listed as follows.

[0074] (1) On the basis of the third coating apparatus according to the invention, the exhaust pipe is arranged above the floor portion.

[0075] (2) On the basis of any one of the first to ninth coating apparatuses, the height of the space below the floor of the booth is lower than the height of the filter housing.

[0076] (3) On the basis of any one of the seventh to ninth coating apparatuses, the dust collecting portion is provided with a blocking member for blocking the inside of the dust collecting portion from the outside.

[0077] (4) On the basis of the seventh or eighth coating apparatus, the dust collecting portion houses a filter for removing paint mist contained in the spray air.

[0078] (5) On the basis of any one of the first to ninth coating apparatuses, a plurality of the paint mist removing devices are arranged along the length direction of the coating line.

[0079] ​(6) A coating apparatus including a coating booth having a pair of side walls and a floor portion that defines a spray space above the floor portion and conveys a coated object in a length direction of a coating line, and a paint mist removing device having a filter housing that houses a primary filter and a secondary filter, and removes paint mist from spray air discharged from the spray space by causing the spray air to flow through the primary filter and the secondary filter housed in the filter housing; the coating apparatus characterized in that the paint mist removing device is disposed at a position offset in a width direction of the coating line and at the same height as the floor portion, avoiding the spray space, and an air conveying flow path that connects the spray space and the paint mist removing device is formed at the position offset in the width direction of the coating line, avoiding the spray space. REFERENCE NUMERALS

[0080] 1 … Coating apparatus 11 … Coating booth 12 … Side wall 13 … Floor portion 14 … Coating line 21 … Air conveying flow path 22 … Downward duct 23 … Flow direction changing portion 24 … Transverse duct 26 … Dust collecting portion 30 … Paint mist removing device 31 … Filter housing 32 … Lower housing portion 33 … Upper housing portion 35 … Inflow 36 … Outflow 40 … Primary filter (corrugated paper filter) 60 … Secondary filter 82 … Exhaust duct 93 … Straightening portion 94 … Inclined bottom surface 95 … Liquid collecting groove A2 … Spray air S1 … Spray space S2 … Floor space below the booth W1 … Coated object

Claims

1. A painting apparatus comprising: a painting booth having a pair of side walls and a floor portion, a painting space being partitioned above the floor portion, a booth floor lower space being partitioned below the floor portion, and a coated article being conveyed in a length direction of a painting line; and a paint mist removing device having a filter housing body in which a primary filter and a secondary filter are housed, paint mist in painting air being removed by causing the painting air discharged from the painting space to flow through the primary filter and the secondary filter housed in the filter housing body, characterized in that the paint mist removing device is disposed at a position offset in a width direction of the painting line, avoiding the booth floor lower space.

2. The painting apparatus according to claim 1, characterized in that the paint mist removing device is disposed at a position spaced apart from the side walls.

3. The painting apparatus according to claim 2, characterized in that an exhaust duct is connected to an outlet of the filter housing body, the exhaust duct being disposed at a position offset in the width direction of the painting line, avoiding the booth floor lower space.

4. The painting apparatus according to claim 1, characterized in that the primary filter and the secondary filter are disposed in an up-and-down relationship in the filter housing body.

5. The painting apparatus according to claim 4, characterized in that the filter housing body has a lower housing portion and an upper housing portion, the lower housing portion housing the primary filter which is freely attachable and detachable, the upper housing portion housing the secondary filter which is freely attachable and detachable.

6. The painting apparatus according to claim 5, characterized in that the filter housing body has an inlet for introducing the painting air into the primary filter in the lower housing portion, and an outlet for discharging the painting air having passed through the secondary filter in the upper housing portion.

7. The painting apparatus according to any one of claims 1 to 6, characterized in that an air conveying flow path connecting the painting space and the paint mist removing device is formed in the booth floor lower space, and a dust collecting portion for removing paint mist contained in the painting air is provided midway in the air conveying flow path.

8. The painting apparatus according to claim 7, characterized in that the air conveying flow path includes a downward pipe extending downward from a center of the floor portion, a flow direction changing portion connected to a distal end of the downward pipe for changing a flow direction of the painting air, and a lateral pipe connected to the flow direction changing portion and extending laterally toward the paint mist removing device, the dust collecting portion is provided at the flow direction changing portion, and a flow straightening portion is formed in the lateral pipe, a bottom surface of the flow straightening portion having a slope gradually decreasing toward the flow direction changing portion.

9. The painting apparatus according to claim 8, characterized in that a liquid accumulation groove is provided in a lower portion of the dust collecting portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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