Paint drying oven

Abstract

To obtain a paint drying oven that makes it easy to ensure the durability of the drive source for the movable nozzle. [Solution] The paint drying oven 10 comprises a drying oven body 12 in which an automobile body B coated with a wet paint film is transported inside, an air supply duct 14 provided on the top wall 12A, left wall 12C, and right wall 12D of the drying oven body 12, and a movable nozzle 18 provided inside the drying oven body 12 that blows air from the air supply duct 14 into the drying oven body 12 and can change the direction of air discharge. Furthermore, the paint drying oven 10 comprises a rotary motor 24 and an inclined motor 26 provided outside the drying oven body 12 that rotate the movable nozzle 18, and a drive force transmission unit 28 that connects the rotary motor 24 and the inclined motor 26 to the movable nozzle 18 and transmits the driving force of the rotary motor 24 and the inclined motor 26 to the movable nozzle 18.

Description

Technical Field

[0004] ,

[0006] , , , ,

[0005] , , , ,

[0001] The present invention relates to a painting drying furnace.

Background Art

[0002] The painting drying device of Patent Document 1 below has a hot air supply device that supplies hot air into the drying furnace body. The hot air supply device includes an air supply duct through which hot air is supplied, and a second hot air outlet attached to the air supply duct. The second hot air outlet includes a blowout port (nozzle) that blows out hot air from the intake duct, a support that supports the nozzle via a cross-shaped shaft body, a base that supports the blowout port and the support, a first drive unit that rotates the support in a horizontal plane with respect to the base, and a second drive unit that rotates the nozzle in a vertical plane with respect to the support, and the blowing direction of the hot air blown out from the nozzle can be changed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above prior art, since the first drive unit and the second drive unit are arranged in the air supply duct and a drive source such as a motor exists in the flow of high-temperature air, there is room for improvement from the viewpoint of ensuring the durability of the drive source.

[0005] An object of the present invention is to obtain a painting drying furnace in which it is easy to ensure the durability of the drive source of the movable nozzle.

Means for Solving the Problems

[0006] One aspect of the present invention is a paint drying oven comprising: a drying oven body in which a workpiece coated with a wet paint film is transported; an air supply duct provided on the wall of the drying oven body; and a movable nozzle provided inside the drying oven body for blowing air from the air supply duct into the drying oven body and for changing the direction of air discharge, wherein the drying oven is further characterized by comprising: a drive source provided outside the drying oven body for rotating the movable nozzle; and a drive force transmission unit connecting the drive source and the movable nozzle and transmitting the driving force of the drive source to the movable nozzle.

[0007] In this embodiment, a workpiece coated with a wet coating is transported inside the drying oven body. An air supply duct is provided in the wall of the drying oven body. A movable nozzle is provided inside the drying oven body to blow air from the air supply duct into the drying oven body. This movable nozzle is connected to a drive source by a drive force transmission unit. The drive force transmission unit transmits the driving force of the drive source to the movable nozzle. As a result, the movable nozzle rotates, and the direction of air blown out from the movable nozzle is changed. Since the drive source is located outside the drying oven body, the drive source is not exposed to high temperatures even when the air is at a high temperature. Therefore, it is easy to ensure the durability of the drive source. [Effects of the Invention]

[0008] As described above, according to the present invention, it is easy to ensure the durability of the drive source of the movable nozzle. [Brief explanation of the drawing]

[0009] [Figure 1] This is a longitudinal cross-sectional view showing a paint drying oven according to the first embodiment. [Figure 2A] This is a longitudinal cross-sectional view showing a part of a paint drying oven according to the first embodiment. [Figure 2B] This is a view in the direction of arrow 2B in Figure 2A, showing a part of the configuration shown in Figure 2A. [Figure 3A] This is a cross-sectional view corresponding to Figure 2A, showing the tilt state of the movable nozzle. [Figure 3B]This is a view in the direction of arrow 3B in Figure 3A, showing a part of the configuration shown in Figure 3A. [Figure 4] This is a longitudinal cross-sectional view showing a part of a paint drying oven according to the second embodiment. [Figure 5] This is a longitudinal cross-sectional view showing a paint drying oven according to the third embodiment. [Figure 6A] This is a plan cross-sectional view showing a paint drying oven according to the fourth embodiment. [Figure 6B] This is a longitudinal cross-sectional view showing a paint drying oven according to the fourth embodiment. [Figure 7A] This is a cross-sectional view showing a paint drying oven according to the fifth embodiment. [Figure 7B] This is a longitudinal cross-sectional view showing a paint drying oven according to the fifth embodiment. [Modes for carrying out the invention]

[0010] <First Embodiment> The paint drying oven 10 according to the first embodiment of the present invention will be described below with reference to Figures 1 to 3B. Note that some reference numerals may be omitted in each figure for clarity.

[0011] As shown in Figure 1, the paint drying oven 10 according to this embodiment is one of the devices that make up the painting line for an automobile body B, and is a device for drying the wet paint film applied to the automobile body B while transporting the automobile body B mounted on the painting trolley T. The above drying includes, for example, topcoat drying, intermediate coat drying, and undercoat drying.

[0012] This paint drying oven 10 includes a drying oven body 12 through which an automobile body B coated with a wet paint film is transported. The automobile body B corresponds to the "workpiece" in this invention. The automobile body B is coated with a wet paint film, for example, by electrodeposition coating. The drying oven body 12 is rectangular and has a top wall 12A, a floor 12B, a left wall 12C, and a right wall 12D.

[0013] The painting carriage T for transporting the automobile body B is provided on the floor surface 12B. This painting carriage T transports the automobile body B from the back side to the front side in the direction perpendicular to the plane of FIG. 1. Air supply ducts 14 are provided inside the furnace on each of the ceiling wall portion 12A, the left wall portion 12C, and the right wall portion 12D. Further, exhaust ducts 16 are provided above the air supply ducts 14 inside the furnace on each of the left wall portion 12C and the right wall portion 12D.

[0014] Hot air generated by a hot air supply device (not shown) is supplied into each air supply duct 14. The hot air supply device is configured to include, for example, an air supply fan, an air supply filter connected to the suction side of the air supply fan, and a burner connected to the discharge side of the air supply fan. The air inhaled by the air supply fan is filtered by the air supply filter and heated to a predetermined temperature by the burner, and then supplied into each air supply duct 14.

[0015] One or more movable nozzles 18 are attached to the inside of the furnace of each air supply duct 14. Each movable nozzle 18 has a cylindrical shape, and the inside of the drying furnace body 12 communicates with the inside of each air supply duct 14 through each movable nozzle 18. The high-temperature air supplied into each air supply duct 14 blows out into the drying furnace body 12 through each movable nozzle 18, and then is exhausted outside the drying furnace body 12 through each exhaust duct 16.

[0016] As shown in FIG. 2A, the movable nozzle 18 is attached to the wall portion 14A on the inside of the furnace (the lower side in FIG. 2A) of the air supply duct 14 via a gear cover 20. The gear cover 20 is formed in a substantially box shape by, for example, a press-formed metal plate. A circular through-hole (reference numeral omitted) is formed in the wall portion on the inside of the furnace (the lower side in FIG. 2A) of the gear cover 20, and the movable nozzle 18 is attached to the edge of the through-hole.

[0017] The movable nozzle 18 has a base portion 18A on the side of the gear cover 20 formed in a bellows shape, and a tip portion 18B on the side opposite to the gear cover 20 formed in a frustum of a cone shape. This movable nozzle 18 is made of a material having heat resistance and flexibility, and is deformable at the base portion 18A. The tip portion 18B of the movable nozzle 18 is formed so that the diameter thereof decreases toward the tip side (the side opposite to the base portion 18A), and the tip of the tip portion 18B is the hot air outlet 18C.

[0018] A gear cover 22 is provided on the wall portion 14B of the outside of the furnace (the upper side in FIG. 2A) of the air supply duct 14. Although schematically illustrated in FIG. 2A, the wall portion 14B of the outside of the furnace of the air supply duct 14 is shared with the wall portion of the drying furnace main body 12. The gear cover 22 is disposed on the side opposite to the gear cover 20 via the air supply duct 14. This gear cover 22 is formed in a substantially box shape by, for example, a press-formed metal plate material. A rotary motor 24 as a rotational drive source and a tilt motor 26 as a tilt drive source are attached to the outside of the furnace (the upper side in FIG. 2A) of the gear cover 22. The rotary motor 24 and the tilt motor 26 are gear motors, and are connected to the movable nozzle 18 via a driving force transmission portion 28.

[0019] The driving force transmission portion 28 includes a rotation transmission portion 30 that transmits the driving force of the rotary motor 24 to the movable nozzle 18 and rotates the movable nozzle 18, and a tilt transmission portion 32 that transmits the driving force of the tilt motor 26 to the movable nozzle 18 and tilts the movable nozzle 18. The rotation transmission portion 30 includes a pinion 34 and a gear 36A disposed in the gear cover 22, a pinion 40 and a gear 42A disposed in the gear cover 20, and a rotation shaft 46. The tilt transmission portion 32 includes a tilt shaft 48, an orthogonal gear box 50, and a lever 54. The orthogonal gear box 50 is, for example, a bevel box.

[0020] The pinion 34, the pinion 40, the rotating shaft 46, and the output shaft of the rotating motor 24 are arranged coaxially with respect to each other, with their respective axial directions perpendicular to the transport direction of the automobile body B (up and down in Figure 2A). The rotating shaft 46 penetrates the inner wall 14A and the outer wall 14B of the air supply duct 14, and is rotatably supported by bearings 45 and 47 on each wall 14A and 14B.

[0021] The rotating shaft 46 is connected to the output shaft of the rotating motor 24 so as to be coaxial and integrally rotatable. A pinion 34 is fixed to one end of the rotating shaft 46 (the end on the outside of the furnace), and a pinion 40 is fixed to the other end of the rotating shaft 46 (the end on the inside of the furnace). A gear 36A meshes with the pinion 34, and a gear 42A meshes with the pinion 40. As an example, a universal joint is provided in the middle of the rotating shaft 46, but a configuration without a universal joint in the middle of the rotating shaft 46 is also possible.

[0022] Gear 36A, gear 42A, tilting shaft 48, and the output shaft of the tilting motor 26 are arranged coaxially with each other, with their respective axial directions perpendicular to the transport direction of the automobile body B (up and down direction in Figure 2A). Gear 36A constitutes the outer ring of bearing 36, and the inner ring of bearing 36 is fixed to the wall portion 14B of the air supply duct 14 via a ring member 38 arranged concentrically with bearing 36. This gear 36A is meshed with pinion 34. Similarly, gear 42A constitutes the outer ring of bearing 42, and the inner ring of bearing 42 is fixed to the wall portion 14A of the air supply duct 14 via a ring member 44 arranged concentrically with bearing 42.

[0023] When the rotary motor 24 rotates, the rotary shaft 46, pinion 34, and pinion 40 rotate, and gears 36A and 42A also rotate. A rotating part 22A, which is part of the gear cover 22, is attached to gear 36A, and a rotating part 20A, which is part of the gear cover 20, is attached to gear 42A. The rotating part 22A is capable of rotating integrally with gear 36A, and the rotating part 20A is capable of rotating integrally with gear 42A. A tilting motor 26 is attached to the rotating part 22A, and a movable nozzle 18 is attached to the rotating part 20A. The tilting motor 26 and the movable nozzle 18 rotate integrally with gears 36A and 42A.

[0024] The tilting shaft 48 is connected to the output shaft of the tilting motor 26 so as to be able to rotate integrally with it. The tilting shaft 48 penetrates the inner wall 14A and the outer wall 14B of the air supply duct 14 and is arranged coaxially with the gears 36A and 42A. As an example, a universal joint is provided in the middle of the tilting shaft 48, but a configuration without a universal joint is also possible. The input shaft of the orthogonal gearbox 50 is fixed coaxially with one end of the tilting shaft 48 (the end on the inner side of the furnace).

[0025] The orthogonal gearbox 50 is attached to gear 42A (i.e., bearing 42) via a pair of stays 52 that extend radially to the gear 42A. The pair of stays 52 are made of, for example, L-shaped metal plates. The output shaft of the orthogonal gearbox 50 is oriented perpendicular to the axis of the inclined shaft 48. A lever 54 is fixed to this output shaft.

[0026] The lever 54 is located within the base 18A of the movable nozzle 18. This lever 54 is made of a metal plate material bent into a roughly U-shape, for example, and has a main body 54A fixed to the output shaft of the orthogonal gearbox 50, and a shaft portion 54B extending from the center of the main body 54A toward the opposite side from the orthogonal gearbox 50. The shaft portion 54B is located coaxially with the movable nozzle 18. This shaft portion 54B is connected to a stay 56 extending radially from the movable nozzle 18 via a pair of bearings (not shown). The stay 56 is fixed to the intermediate portion of the movable nozzle 18 between the base 18A and the tip 18B.

[0027] The rotational driving force of the tilt motor 26 is transmitted to the movable nozzle 18 via the tilt shaft 48, the orthogonal gearbox 50, the lever 54, and the stay 56 (see arrow R1 in Figure 3A). As a result, the movable nozzle 18 is configured to tilt, as shown in Figures 3A and 3B. In this process, the lever 54 swings around the output shaft of the orthogonal gearbox 50, causing the movable nozzle 18 to deform at its base 18A, and the axis of the tip 18B of the movable nozzle 18 to tilt with respect to the axis of the tilt shaft 48. The tilt shaft 48, the orthogonal gearbox 50, the lever 54, and the stay 56 constitute the tilt transmission unit 32.

[0028] Furthermore, in this embodiment, the rotational driving force of the rotary motor 24 is transmitted to the movable nozzle 18 via the rotary shaft 46, pinion 40, gear 42A, stay 52, orthogonal gearbox 50, lever 54, and stay 52 (see arrow R2 in Figure 3A). As a result, the movable nozzle 18 rotates around the axis of the gear 42A (see arrow R3 in Figure 3B). Therefore, by rotating the rotary motor 24 with the movable nozzle 18 tilted as shown in Figure 3B, the direction of hot air discharge from the movable nozzle 18 (see arrow F in Figure 3A) can be changed along the entire circumferential direction of the gear 42A.

[0029] The rotary motor 24 and tilting motor 26 described above are electrically connected to a control device 58 (not shown except in Figure 2A). The control device 58 consists of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), storage, and an input / output interface (I / F).

[0030] The CPU is a central processing unit that executes various programs and controls each part. Specifically, the CPU reads programs from ROM and executes them using RAM as a working area. In this embodiment, the program is stored in ROM. A workpiece detection sensor 60 (not shown except in Figure 2A), which is a detection means, is electrically connected to the input / output interface. The workpiece detection sensor 60 is, for example, an optical sensor or an ultrasonic sensor, and detects the type of workpiece being transported in the drying oven body 12. The control device 58 is configured to control the operation of the rotary motor 24 and the tilt motor 26 based on the detection result of the workpiece detection sensor 60, and to change the direction of hot air blown out from each movable nozzle 18.

[0031] In this embodiment, a rotary motor 24 and a tilting motor 26 are used as the rotational drive source and tilting drive source, respectively, but the invention is not limited to these. The drive source may be an air-driven source such as an air cylinder driven by compressed air.

[0032] In the paint drying oven 10 with the above configuration, the automobile body B to which the wet paint film has been applied is transported inside the drying oven body 12. Air supply ducts 14 are provided in the top wall 12A, left wall 12C, and right wall 12D of the drying oven body 12. A movable nozzle 18 is provided inside the drying oven body 12 to blow high-temperature air from the air supply duct 14 into the drying oven body 12. The movable nozzle 18 is connected to a rotary motor 24 and a tilting motor 26 by a drive force transmission unit 28. The drive force transmission unit 28 transmits the driving force of the rotary motor 24 and the tilting motor 26 to the movable nozzle 18. As a result, the movable nozzle 18 is rotated, and the direction of the blown-out high-temperature air from the movable nozzle 18 is changed. Since the rotary motor 24 and the tilting motor 26 are located outside the drying oven body 12, the rotary motor 24 and the tilting motor 26 are not exposed to high temperatures. Therefore, it is easy to ensure the durability of the rotary motor 24 and the tilting motor 26.

[0033] Furthermore, in this embodiment, the control device 58 changes the direction of high-temperature air blown from the movable nozzle 18 according to the type of workpiece detected by the workpiece detection sensor 60 (in this case, the type of automobile body B). This allows high-temperature air to be blown in an appropriate direction according to the type of automobile body B, enabling proper drying of the wet coating.

[0034] In this embodiment, the driving force of the rotary motor 24 is transmitted to the movable nozzle 18 by the rotation transmission unit 30, causing the movable nozzle 18 to rotate around the axis of the gear 42A. Simultaneously, the driving force of the tilt motor 26 is transmitted to the movable nozzle 18 by the tilt transmission unit 32, causing the movable nozzle 18 to tilt with respect to the axis of the gear 42A. This allows the direction of the high-temperature air discharged from the movable nozzle 18 to be changed within a 360-degree range around the gear 42A.

[0035] Furthermore, in this embodiment, the rotation transmission unit 30 includes a pinion 40 connected to the rotary motor 24 via a rotating shaft 46, and a gear 42A that is rotatable integrally with the movable nozzle 18 and meshes with the pinion 40. This allows the driving force of the rotary motor 24, which is located outside the drying oven body 12, to be transmitted to the movable nozzle 18 with a simple configuration, thereby allowing the movable nozzle 18 to rotate.

[0036] Furthermore, in this embodiment, the tilt transmission unit 32 includes an orthogonal gearbox 50 connected to the tilt motor 26 via a tilt shaft 48, and a lever 54 attached to the orthogonal gearbox 50 that can be tilted integrally with the movable nozzle 18. This allows the driving force of the tilt motor 26, which is located outside the drying oven body 12, to be transmitted to the movable nozzle 18 with a simple configuration, thereby tilting the movable nozzle 18.

[0037] <Second Embodiment> Figure 4 shows a vertical cross-sectional view of a part of a paint drying oven according to the second embodiment of the present invention. Components and operations that are basically the same as those in the first embodiment are given the same reference numerals as in the first embodiment and their descriptions are omitted. In this embodiment, the gap between the inclined shaft 48 (corresponding to the "shaft" in the present invention), which penetrates the outer wall portion 14B of the air supply duct 14 (i.e., the wall portion of the drying oven body 12), and the wall portion 14B is sealed by a heat-resistant and sliding sealing member 66. This prevents high-temperature air flowing through the air supply duct 14 from entering the gear cover 22 side, thereby protecting the rotary motor 24 and the inclined motor 26 from high-temperature air.

[0038] In this embodiment, the rotating shaft 46 is configured with an insulating section 62 made of a material with lower thermal conductivity than iron on the side facing the rotating motor 24, while the remaining portion is made of iron. Similarly, the inclined shaft 48 is configured with an insulating section 64 made of a material with lower thermal conductivity than iron on the side facing the inclined motor 26, while the remaining portion is made of iron. Examples of materials for the insulating sections 62 and 64 include SUS304 and titanium alloy. The insulating sections 62 and 64 are positioned close to the wall section 14B. This prevents heat from the supply air duct 14 from being transmitted to the rotating motor 24 and inclined motor 26 via the rotating shaft 46 and inclined shaft 48.

[0039] <Third Embodiment> Figure 5 shows a vertical cross-sectional view of a paint drying oven according to a third embodiment of the present invention. In this embodiment, the oven body is equipped with a plurality of (in this case, two) movable nozzles 18 arranged in the height direction, and a drive force transmission unit 28 connecting a rotary motor 24 and a tilting motor 26 to the two movable nozzles 18. In other words, in this embodiment, the two movable nozzles 18 are driven (rotated and tilted) by one rotary motor 24 and one tilting motor 26.

[0040] The rotary motor 24 and the tilting motor 26 are connected to a rotating shaft 46 and a tilting shaft 48, respectively, which are connected to one of the two movable nozzles 18 (the lower right movable nozzle 18 in Figure 5). The rotary shaft 46 and the tilting shaft 48 connected to one of the movable nozzles 18 are connected to the rotary shaft 46 and the tilting shaft 48 connected to the other of the two movable nozzles 18 (the upper right movable nozzle 18 in Figure 5), respectively, by an interlocking unit 68.

[0041] The interlocking section 68 is composed of, for example, a timing belt and timing pulley, a timing chain and timing sprocket, or a link mechanism. This interlocking section 68 interlocks a rotating shaft 46 connected to one movable nozzle 18 with a rotating shaft 46 connected to the other movable nozzle 18, and also interlocks a tilting shaft 48 connected to one movable nozzle 18 with a tilting shaft 48 connected to the other movable nozzle 18. As a result, when the rotating motor 24 and the tilting motor 26 rotate, the two movable nozzles 18 are moved in conjunction. With this configuration, the manufacturing cost of the paint drying oven 10 can be reduced compared to a configuration in which a rotating motor 24 and a tilting motor 26 are provided for each of the multiple movable nozzles 18.

[0042] <Fourth Embodiment> Figure 6A shows a plan cross-sectional view of a paint drying oven according to the fourth embodiment of the present invention, and Figure 6B shows a longitudinal cross-sectional view of the paint drying oven according to the fourth embodiment of the present invention. In this embodiment, a plurality of nozzle units 17 are provided on the left wall portion 12C and the right wall portion 12D of the drying oven body 12, arranged in the direction of transport of the automobile body B (direction of arrow CD in Figure 6A) and in a direction perpendicular to the transport direction (here, the height direction of the drying oven body 12). Each of the plurality of nozzle units 17 has a movable nozzle 18, a rotary motor 24, a tilt motor 26, and a drive force transmission unit 28.

[0043] The rotary motors 24 and tilt motors 26 of the multiple nozzle units 17 are electrically connected to a control device 58 (not shown in Figures 6A and 6B). The control device 58 is configured to control the rotary motors 24 and tilt motors 26 of each nozzle unit 17 individually, simultaneously, according to the transport direction and according to the orthogonal directions. This reduces costs compared to, for example, a configuration in which a control device 58 is provided for each of the multiple nozzle units 17.

[0044] <Fifth Embodiment> Figure 7A shows a plan view of a paint drying oven according to the fifth embodiment of the present invention, and Figure 7B shows a longitudinal view of the paint drying oven according to the fifth embodiment of the present invention. In this embodiment, an air supply duct 14 is provided on the outside (upper) side of the top wall portion 12A of the drying oven body 12. Room temperature air is supplied into the air supply duct 14.

[0045] Below the air supply duct 14, a plurality of (in this case, six) movable nozzles 70 for air sealing are provided inside the drying oven body 12. The plurality of movable nozzles 70 are arranged in the direction of transport of the automobile body B (see arrows CD in Figure 7A) and in the width direction of the drying oven body 12 (left and right direction in Figure 7B). In this embodiment, the movable nozzles 70 are arranged in two rows in the transport direction, and in each row, three movable nozzles 70 are arranged in the width direction. Each movable nozzle 70 is rotatable around a rotation axis (not shown) along the width direction.

[0046] Each movable nozzle 70 blows air from the air supply duct 14 into the drying oven body 12 as an air seal (see arrow F in Figure 7A), and is also capable of changing the direction of air discharge by being rotated (see arrow R in Figure 7A).

[0047] Above the air supply duct 14 and outside the drying oven body 12, there are multiple (four in this case) rotary motors 24, which are the drive sources for rotating the multiple movable nozzles 70. The output shafts (not shown in the reference numerals) of the rotary motors 24 and the rotation shafts of the four movable nozzles 70 are connected by a drive force transmission unit 72. The drive force transmission unit 72 is composed of, for example, a timing belt and a timing pulley, and transmits the rotational driving force of the rotary motors 24 to the rotation shafts of the movable nozzles 70. This is configured to cause the movable nozzles 70 to rotate. In this embodiment as well, since the rotary motors 24 are located outside the drying oven body 12, the rotary motors 24 are not exposed to high temperatures. Therefore, the durability of the rotary motors 24 can be ensured.

[0048] Although the present invention has been described above with reference to several embodiments, the present invention can be implemented with various modifications without departing from its spirit. Furthermore, it goes without saying that the scope of the present invention is not limited to the above-described embodiments.

[0049] The following additional information is disclosed regarding the embodiments described above.

[0050] (Note 1) A drying oven body in which workpieces coated with a wet coating are transported, An air supply duct provided in the wall of the drying oven body, A movable nozzle is provided inside the drying oven body, which blows air from the supply air duct into the drying oven body and can change the direction of air discharge when driven, A drive source provided outside the main body of the drying oven, A drive force transmission unit connects the drive source and the movable nozzle and transmits the driving force of the drive source to the movable nozzle, A paint drying oven equipped with a paint drying oven. (Note 2) The aforementioned drive force transmission unit has a shaft that penetrates the wall of the drying oven body, The paint drying oven according to Appendix 1, wherein the gap between the wall portion and the shaft is sealed by a heat-resistant and sliding sealing member. (Note 3) The paint drying oven according to Appendix 1 or Appendix 2, wherein the drive force transmission section has a shaft in which at least a portion on the drive source side is made of a material with lower thermal conductivity than iron. (Note 4) The system includes a plurality of movable nozzles arranged in the direction of transporting the workpiece or in a direction perpendicular to the transporting direction, The paint drying oven described in any of the appendices 1 to 3, wherein the drive force transmission unit connects the drive source and the plurality of movable nozzles and has an interlocking unit that interlocks the plurality of movable nozzles. (Note 5) The aforementioned interlocking part is a paint drying oven as described in Appendix 4, having a timing belt. (Note 6) The aforementioned drive source is an air-driven drive source that is driven by compressed air, as described in any of the appendices 1 to 5 of the Paint Drying Oven. (Note 7) A detection means for detecting the type of workpiece, A control device that controls the operation of the drive source and changes the blowing direction based on the detection result of the detection means, A paint drying oven equipped with any of the features described in Appendix 1 to Appendix 6. (Note 8) The aforementioned drive source includes a rotary drive source and a tilt drive source. The aforementioned drive force transmission unit is A rotation transmission unit that transmits the driving force of the rotation drive source to the movable nozzle and rotates the movable nozzle, A tilt transmission unit that transmits the driving force of the tilt drive source to the movable nozzle and tilts the movable nozzle, A paint drying oven described in any of the appendices 1 to 7, which has the following characteristics. (Note 9) The aforementioned rotational transmission unit is A pinion connected to the rotational drive source via a rotating shaft, The movable nozzle is rotatable integrally with the gear meshed with the pinion, A paint drying oven as described in Appendix 8, having the following features. (Note 10) The aforementioned inclined transmission unit is An orthogonal gearbox connected to the tilt drive source via a tilt shaft, The movable nozzle is integrally tiltable and has a lever attached to the orthogonal gearbox, A paint drying oven as described in Appendix 8 or Appendix 9, having the following features. [Explanation of Symbols]

[0051] 10 Paint drying oven 12 Drying oven body 14. Air supply duct 18 Movable nozzle 24 Rotary motor (rotation drive source; drive source) 26. Inclination motor (inclination drive source; drive source) 28 Power transmission section 30 Rotational transmission section 32 Inclined transmission section 40 pinion 42A Gear 46 Rotation shaft 48 Inclined shaft (shaft) 50 Right-angle gearbox 54 Lever 58 Control device 60 Workpiece detection sensor (detection means) 66 Seal member 68 Interlocking section 70 movable nozzles 72 Power transmission section B. Automotive Body (Work)

Claims

1. A drying oven body in which workpieces coated with a wet coating are transported, An air supply duct provided in the wall of the drying oven body, A movable nozzle is provided inside the drying oven body, which blows air from the supply air duct into the drying oven body and can change the direction of air discharge, In a paint drying oven equipped with, A drive source provided outside the drying oven body that rotates the movable nozzle, A paint drying oven characterized by comprising a drive force transmission unit that connects the drive source and the movable nozzle and transmits the driving force of the drive source to the movable nozzle.

2. The aforementioned drive force transmission unit has a shaft that penetrates the wall of the drying oven body, The paint drying oven according to claim 1, wherein the gap between the wall portion and the shaft is sealed by a sealing member having heat resistance and sliding properties.

3. The paint drying oven according to claim 1 or 2, wherein the driving force transmission section has a shaft in which at least a portion on the drive source side is made of a material with lower thermal conductivity than iron.

4. The system includes a plurality of movable nozzles arranged in the direction of transporting the workpiece or in a direction perpendicular to the transporting direction, The paint drying oven according to claim 1 or 2, wherein the drive force transmission unit has an interlocking unit that connects the drive source and the plurality of movable nozzles and interlocks the plurality of movable nozzles.

5. The paint drying oven according to claim 4, wherein the interlocking part has a timing belt.

6. The paint drying oven according to claim 1 or claim 2, wherein the drive source is an air-driven drive source driven by compressed air.

7. A detection means for detecting the type of workpiece, A control device that controls the operation of the drive source and changes the blowing direction based on the detection result of the detection means, A paint drying oven according to claim 1 or claim 2, comprising:

8. The aforementioned drive source includes a rotary drive source and a tilt drive source. The aforementioned drive force transmission unit is A rotation transmission unit that transmits the driving force of the rotation drive source to the movable nozzle and rotates the movable nozzle, A tilt transmission unit that transmits the driving force of the tilt drive source to the movable nozzle and tilts the movable nozzle, A paint drying oven according to claim 1 or claim 2, having the following features.

9. The aforementioned rotational transmission unit is A pinion connected to the rotational drive source via a rotating shaft, The movable nozzle is rotatable integrally with the gear meshed with the pinion, A paint drying oven according to claim 8, having the following features.

10. The aforementioned inclined transmission unit is An orthogonal gearbox connected to the tilt drive source via a tilt shaft, The movable nozzle is integrally tiltable and has a lever attached to the orthogonal gearbox, A paint drying oven according to claim 8, having the following features.

Images