Infrared curing device for coating large butterfly valve

Abstract

The utility model discloses an infrared curing device for coating a large butterfly valve, which solves the problem of curing powder coating on the surface of the butterfly valve by using an infrared heating method. Comprising an insulated house; the placing seat is arranged in the heat preservation room and comprises a base and a plurality of supporting seats, an avoiding structure is arranged in the middle of the base, and the supporting seats are arranged around the avoiding structure and can be mutually gathered or separated for adjustment; the first radiation device comprises a first support arranged in the middle of the avoiding structure, the first support is provided with a first movable part capable of ascending and descending, and a plurality of first infrared lamps are arranged on the first movable part in a surrounding mode; the second radiation device comprises a second support connected with the top of the insulated house, the second support is provided with a second movable part capable of ascending and descending, the second movable part is provided with a mounting seat, the mounting seat can be rotatably arranged on the second movable part, and a plurality of second infrared lamps are arranged on the lower side of the second movable part in a surrounding mode; and the second infrared lamps can be oppositely gathered or adjusted away from each other.

Description

Technical Field

[0001] This utility model relates to the field of infrared curing technology for coating, and in particular to an infrared curing device for coating large butterfly valves. Background Technology

[0002] With the continuous deepening of environmental protection measures, powder coating of valve surfaces has become a trend.

[0003] However, due to the valve body's thickness and extremely high heat capacity, each spraying operation requires a very long heating time using conventional heating methods, sometimes lasting several hours. This not only affects efficiency but also results in extremely high energy consumption.

[0004] Infrared curing can improve these problems. Because infrared curing is used, the entire workpiece does not need to reach the curing temperature, and the curing time is also greatly shortened. This significantly improves efficiency and reduces energy consumption. It has immense value for the widespread use of powder coatings.

[0005] However, a current challenge is that infrared heating requires a specific distance between the lamp and the workpiece, and there cannot be any areas unaffected by light radiation. Because valve workpieces vary in size and have irregular surfaces, it's difficult to ensure uniform light radiation on the cured surface. Only by arranging the lamps according to the specific dimensions of the valve can uniform radiation be achieved. Therefore, developing an adjustable heating device suitable for most butterfly valves makes infrared curing of valves a viable option. Utility Model Content

[0006] The purpose of this invention is to provide an infrared curing device for coating large butterfly valves, which solves the problem of using infrared heating to cure powder coatings on the surface of workpieces (butterfly valves).

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An infrared curing device for coating large butterfly valves includes: an insulated chamber with an openable and closable door; a placement base inside the insulated chamber, including a base and several support bases on the base, the base having a hollow clearance structure in the middle, the support bases surrounding the clearance structure, and the positions of the support bases being adjustable to be close together or far apart; a first radiation device including a first support in the middle of the clearance structure, the first support having a first movable part that can be raised and lowered, and several first infrared lamps surrounding the first movable part; and a second radiation device including a second support on the first radiation device and connected to the top of the insulated chamber, the second support having a second movable part that can be raised and lowered, the second movable part having a mounting base opposite to the first movable part, the mounting base being rotatably mounted on the second movable part, and several second infrared lamps surrounding the lower side of the second movable part, the second infrared lamps being adjustable to be close together or far apart.

[0009] Based on the above solution and as a preferred embodiment of the above solution: the base includes a cylindrical body, the bottom of which is fixedly connected to the bottom of the insulation room, and a mounting plate is provided on the top of the body. The clearance structure includes a cut hole in the middle of the mounting plate. The mounting plate is provided with a plurality of sliding grooves evenly distributed around the cut hole. The support base includes a connecting part that slides with the sliding grooves, and an upwardly extending support part is provided on the connecting part.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: a support block is provided on the top of the support part, one end of the support block is fixedly connected to the support part in the length direction, and the other end extends away from the avoidance structure, and serrated protrusions extending along the length direction of the support block are continuously provided on the top side of the support block.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: a rotary driver is provided at the bottom of the first support, the rotary driver being used to drive the first support to rotate around its own vertical central axis.

[0012] Based on the above scheme and as a preferred embodiment: a third movable part is provided above the first movable part, and a first telescopic driver for driving the third movable part to rise and fall is provided between the third movable part and the first movable part. A plurality of first hinge seats are provided on both the first movable part and the third movable part, and the first hinge seats on the first movable part and the third movable part are vertically opposite each other. The first infrared lamp includes a vertically arranged first lamp holder, and a first infrared lamp tube is provided on the side of the first lamp holder away from the direction of the first movable part. Two first connecting rods are hinged to the back of the first lamp holder, and the ends of the two first connecting rods away from the direction of the first lamp holder are respectively hinged to the first hinge seats on the first movable part and the third movable part.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme: a third movable part is provided above the first movable part, and a first telescopic driver for driving the third movable part to rise and fall is provided between the third movable part and the first movable part. A plurality of first hinge seats are provided on both the first movable part and the third movable part, and the first hinge seats on the first movable part and the third movable part are opposite each other in the vertical direction.

[0014] The first infrared lamp includes a vertically arranged first lamp holder, and a first infrared lamp tube is arranged on the side of the first lamp holder away from the direction of the first movable part;

[0015] A third connecting rod is hinged to the upper end of the back of the first lamp holder, and a sliding groove extending along the length of the first lamp holder is provided at the other end. A sliding block is provided in the sliding groove and slides therewith. A fourth connecting rod is hinged to the sliding block. The middle part of the third connecting rod is hinged to the middle part of the fourth connecting rod. The end of the third connecting rod away from the first lamp holder is hinged to the first hinge seat on the first movable part. The end of the fourth connecting rod away from the first lamp holder is hinged to the first hinge seat on the third movable part.

[0016] Based on the above scheme and as a preferred embodiment: the mounting base is cylindrical, and a plurality of second hinge seats are evenly distributed around the lower side of the mounting base. A second connecting rod is hinged to the second hinge seat. One end of the second connecting rod extends toward the inside of the mounting base, and the other end extends away from the mounting base. The end of the second connecting rod near the inside of the mounting base is provided with a U-shaped groove in the vertical direction. A second telescopic actuator is provided inside the mounting base. A driving ring is provided at the movable end of the second telescopic actuator. The ring body of the driving ring is freely embedded in the U-shaped groove. The movable end of the second telescopic actuator moves up and down to control the up and down movement of the driving ring. The second infrared lamp includes a second lamp holder. A second infrared lamp tube is provided on the side of the second lamp holder facing the central axis of the mounting base. The top of the second lamp holder is hinged to the end of the second connecting rod away from the mounting base. The second infrared lamp is set in a vertical state under its own gravity.

[0017] Based on the above scheme and as a preferred embodiment of the above scheme: the second lamp holder is C-shaped with its opening direction facing the central axis direction of the mounting base.

[0018] To solve the problem of curing powder coatings on the surface of workpieces (butterfly valves) using infrared heating, this utility model has the following beneficial effects:

[0019] This large-scale infrared curing device for butterfly valve coating sets up a placement base, a first radiation device, and a second radiation device inside an insulated chamber. The placement base supports the butterfly valve, the first radiation device heats the inside of the butterfly valve, and the second radiation device heats the outside of the butterfly valve. The insulated chamber provides an insulated environment during the heating process, preventing heat loss from affecting the heating effect, thereby achieving the purpose of curing the powder coating on the surface of the butterfly valve.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the infrared curing device for coating large butterfly valves according to this utility model;

[0022] Figure 2 This is a schematic diagram showing the positional relationship between the placement base, the first radiation device, and the workpiece of this utility model.

[0023] Figure 3 This is a schematic diagram of the placement base structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the first radiation device of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second radiation device of this utility model;

[0026] Figure 6 This is a cross-sectional structural diagram of the second radiation device of this utility model;

[0027] Figure 7 This is a schematic diagram of another embodiment of the first radiation device of this utility model. Detailed Implementation

[0028] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0029] See Figure 1-7 This utility model discloses an infrared curing device for coating large butterfly valves. This infrared curing device for coating large butterfly valves can be used for the curing treatment of powder coatings on the surface of butterfly valves (hereinafter referred to as workpieces).

[0030] In this disclosure, Figure 1 As shown, the infrared curing device for coating large butterfly valves of this utility model includes an insulated chamber 100, a placement seat 200, a first radiation device 300, and a second radiation device 400. This infrared curing device for coating large butterfly valves places the placement seat 200, the first radiation device 300, and the second radiation device 400 inside the insulated chamber 100. The placement seat 200 supports the workpiece, the first radiation device 300 heats the inner side of the workpiece, and the second radiation device 400 heats the outer side of the workpiece. The insulated chamber 100 provides an insulated environment during the heating process, preventing heat loss and affecting the heating effect, thereby achieving the purpose of curing the powder coating on the workpiece surface.

[0031] In the embodiments of this disclosure, such as Figure 1 As shown, the insulation chamber 100 is equipped with a door 101 that can be opened and closed. When the door 101 is opened, the workpiece is put into the insulation chamber 100 through the door 101 for curing treatment, or the workpiece that has completed curing treatment is taken out of the insulation chamber 100.

[0032] In the embodiments of this disclosure, such as Figure 1 As shown, the placement seat 200 is installed inside the insulation room 100, such as... Figure 3As shown, the placement seat 200 includes a base 201 and a plurality of support seats 207 disposed on the base 201. A hollow clearance structure 204 is provided in the center of the base 201, and the support seats 207 are evenly distributed around the clearance structure 204. The positions of the support seats 207 can be adjusted to be closer together or further apart. The placement seat 200 can be used to support the workpiece. When placing the workpiece, the workpiece is positioned as follows... Figure 2 The object is placed on the mounting base 200 in the posture shown.

[0033] The support base 207 that specifically supports the workpiece has a relatively small top cross section, which can reduce the impact of heating of the contact part due to contact with the workpiece. At the same time, the position of the support base 207 can be adjusted to be closer together or further apart on the base 201, which can be adaptively adjusted according to the size of the workpiece.

[0034] Furthermore, the base 201 includes a cylindrical body 202, the bottom of which is fixedly connected to the bottom of the insulation room 100. A mounting plate 203 is provided on the top of the body 202. The clearance structure 204 includes a cutout 205 in the center of the mounting plate 203. The mounting plate 203 has multiple evenly distributed grooves 206 surrounding the cutout 205, extending radially along the length of the grooves 205. The support base 207 includes a connecting portion 208 that slidably engages with the grooves 206. An upwardly extending support portion 209 is provided on the connecting portion 208. A support block 210 is provided on the top of the support portion 209. One end of the support block 210 is fixedly connected to the support portion 209 along its length, and the other end extends away from the clearance structure 204. A serrated protrusion 211 extending along the length of the support block 210 is continuously provided on the top side of the support block 210.

[0035] The cut hole 205 provides the necessary space for the installation of the first radiation device 300; the connecting part 208 can slide and adjust in the slide groove 206, supporting the position adjustment capability of the support base 207; the serrated protrusion 211 on the top side of the mounting plate 203 supports the end face of the workpiece, reducing the impact of the support base 207 supporting the workpiece on workpiece heating. During the heating process, the first movable part 303 rises to raise the first infrared lamp 308 to the inside of the workpiece to heat the inside of the workpiece.

[0036] In the embodiments of this disclosure, such as Figure 1 As shown, the first radiation device 300 is installed inside the insulation room 100. Figure 2 and 4 As shown, the first radiation device 300 includes a first support 302 disposed in the middle of the avoidance structure 204. The first support 302 is provided with a first movable part 303 capable of vertical movement, and a plurality of first infrared lamps 308 are arranged around the first movable part 303. The first support 302 may be a servo-controlled lifting platform assembly or a servo-driven electric cylinder.

[0037] like Figure 2 As shown, the inner side of the workpiece is heated by the first radiation device 300. The first movable part 303 can move up and down to move the top of the first infrared lamp 308 downward to a position lower than the top of the support base 207. In this case, there is no need to consider the interference between the workpiece and the first radiation device 300 during the movement of the workpiece when picking up or putting it down. This facilitates the picking up and putting down of the workpiece and protects the first radiation device 300.

[0038] Furthermore, a rotary driver 301 is provided at the bottom of the first support 302. The rotary driver 301 is used to drive the first support 302 to rotate around its own vertical central axis. The rotary driver 301 can be a turntable cylinder or an electric turntable. A third movable part 305 is provided above the first movable part 303. A first telescopic driver 304 for driving the third movable part 305 to rise and fall is provided between the third movable part 305 and the first movable part 303. The first telescopic driver 304 can be an electric telescopic rod. A plurality of first hinge seats 306 are provided on both the first movable part 303 and the third movable part 305. The first hinge seats 306 on the first movable part 303 and the third movable part 305 are vertically opposite each other. The first infrared lamp 308 includes a vertically arranged first lamp holder 309. A first infrared lamp tube 310 is provided on the side of the first lamp holder 309 away from the first movable part 303. Two first connecting rods 307 are hinged to the back of the first lamp holder 309. The ends of the two first connecting rods 307 away from the first lamp holder 309 are respectively hinged to the first hinge seats 306 on the first movable part 303 and the third movable part 305.

[0039] Based on this, the rotary driver 301 can drive the first infrared lamp 308 to rotate continuously inside the workpiece, achieving a uniform heating effect. At the same time, the third movable part 305, under the extension and retraction control of the first telescopic driver 304, moves closer to or further away from the first movable part 303 to adjust the distance between the first infrared lamp 310 and the inside of the workpiece, ensuring the heating effect.

[0040] In some embodiments, a third movable part 305 is disposed above the first movable part 303, and a first telescopic driver 304 for driving the third movable part 305 to rise and fall is disposed between the third movable part 305 and the first movable part 303. Both the first movable part 303 and the third movable part 305 are provided with a plurality of first hinge seats 306, which are vertically aligned. The first infrared lamp 308 includes a vertically disposed first lamp holder 309, and a first infrared lamp tube 310 is disposed on the side of the first lamp holder 309 away from the direction of the first movable part 303. Figure 7As shown, a third connecting rod 311 is hinged to the upper end of the back of the first lamp holder 309, and a sliding groove 312 extending along the length of the first lamp holder 309 is provided at the other end. A sliding block 313 is provided in the sliding groove 312 and slides therewith. A fourth connecting rod 314 is hinged to the sliding block 313. The middle part of the third connecting rod 311 is hinged to the middle part of the fourth connecting rod 314. The end of the third connecting rod 311 away from the first lamp holder 309 is hinged to the first hinge seat 306 on the first movable part 303. The end of the fourth connecting rod 314 away from the first lamp holder 309 is hinged to the first hinge seat 306 on the third movable part 305. It is worth noting that this embodiment can very effectively ensure the preset posture of the first infrared lamp 308 during its movement.

[0041] In the embodiments of this disclosure, such as Figure 1 As shown, the second radiation device 400 is installed inside the insulation room 100.

[0042] like Figure 5 and Figure 6 As shown, the second radiation device 400 includes a second support 401 disposed on the first radiation device 300 and connected to the top of the insulation room 100. The second support 401 is provided with a second movable part 402 that can be raised and lowered. The second movable part 402 is provided with a mounting seat 409 that is directly opposite to the first movable part 303. The mounting seat 409 is rotatably disposed on the second movable part 402. A plurality of second infrared lamps 415 are arranged around the lower side of the second movable part 402. The second infrared lamps 415 can be adjusted to converge towards each other or move away from each other.

[0043] The second radiation device 400 heats the outer side of the workpiece. The second movable part 402 drives the second infrared lamp 415 to move up and down to avoid interference during workpiece placement and removal. The second infrared lamps 415 can be adjusted to face each other or move away from each other. This addresses two issues: First, when a workpiece is placed on the placement seat 200, the second infrared lamps 415 need to be adjusted to move away from each other during descent to avoid interference. Once they reach a suitable position, they can be brought together to control the drying distance between the second infrared lamps 415 and the outer side of the workpiece. Second, the second infrared lamps 415 can be adjusted to face each other or move away from each other to accommodate changes in workpiece size and specifications.

[0044] Furthermore, a plurality of second hinge seats 412 are evenly distributed around the lower side of the mounting base 409. A second connecting rod 413 is hinged to each second hinge seat 412. One end of the second connecting rod 413 extends towards the inside of the mounting base 409, and the other end extends away from the mounting base 409. A U-shaped groove 414 with its width direction vertically is provided at the end of the second connecting rod 413 near the inside of the mounting base 409. A second telescopic actuator 410 is provided inside the mounting base 409. The movable end of the second telescopic actuator 410 is provided with… A drive ring 411 is included, with its body freely embedded in a U-shaped groove 414. The movable end of the second telescopic actuator 410 moves up and down to control the up and down movement of the drive ring 411. The second infrared lamp 415 includes a second lamp holder 416. A second infrared lamp tube 417 is disposed on the side of the second lamp holder 416 facing the central axis of the mounting base 409. The top of the second lamp holder 416 is hinged to the end of the second connecting rod 413 away from the mounting base 409. The second infrared lamp 415 is vertically positioned under its own weight. The second lamp holder 416 is C-shaped with its opening facing the central axis of the mounting base 409.

[0045] The up-and-down movement of the drive ring 411 causes the second connecting rod 413 to swing up and down, controlling the second infrared lamps 415 to move closer together or further apart, coordinating with the lifting and lowering of the second movable part 402. When the mounting base 409 is rotated, the second infrared lamps 415 can rotate as a whole, achieving uniform heating of the outer side of the workpiece. Furthermore, the second lamp holder 416 is C-shaped, further improving the heating of the upper and lower end faces of the workpiece.

[0046] The second support 401 may be a servo-controlled lifting platform assembly or a servo-driven electric cylinder; or, the second support 401 may include a connecting plate 403 disposed above the first radiation device 300, the upper side of the connecting plate 403 being connected to the top of the insulation room 100 via a third telescopic actuator 418, and a plurality of telescopic guide rods 404 being disposed around the third telescopic actuator 418 between the upper side of the connecting plate 403 and the top of the insulation room 100, wherein an annular flange 405 is disposed on the lower side of the connecting plate 403, and the annular flange 405 and the connecting plate 403 constitute the second movable part 402 of the second support 401. The lower end of the annular flange 405 is connected to the mounting base 409 via a bearing. A drive motor 406 is fixedly installed on the connecting plate 403 or the annular flange 405. The mounting base 409 is cylindrical, and an annular gear 407 is provided on the outer periphery of the mounting base 409. Then, a drive gear 408 is provided on the drive motor 406 and is connected to the annular gear 407 for transmission so that the drive motor 406 can control the rotation of the mounting base 409.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An infrared curing device for coating large butterfly valves, characterized in that, include: The insulated room (100) is equipped with a door (101) that can be opened and closed; A placement seat (200) is provided inside the insulation room (100), including a base (201) and a plurality of support seats (207) provided on the base (201). The base (201) has a hollowed-out clearance structure (204) in the middle. The support seats (207) are arranged around the clearance structure (204). The positions of the support seats (207) can be adjusted to be close together or far apart. The first radiation device (300) includes a first support (302) disposed in the middle of the avoidance structure (204), the first support (302) is provided with a first movable part (303) that can be raised and lowered, and a plurality of first infrared lamps (308) are arranged around the first movable part (303). The second radiation device (400) includes a second support (401) disposed on the first radiation device (300) and connected to the top of the insulation room (100). The second support (401) is provided with a second movable part (402) that can be raised and lowered. The second movable part (402) is provided with a mounting seat (409) facing the first movable part (303). The mounting seat (409) is rotatably disposed on the second movable part (402). A plurality of second infrared lamps (415) are arranged around the lower side of the second movable part (402). The second infrared lamps (415) can be adjusted to converge towards each other or move away from each other.

2. The infrared curing device for coating large butterfly valves according to claim 1, characterized in that, The base (201) includes a cylindrical seat body (202), the bottom of which is fixedly connected to the bottom of the insulation room (100), and an mounting plate (203) is provided on the top of the seat body (202). The clearance structure (204) includes a cut hole (205) provided in the middle of the mounting plate (203). The mounting plate (203) is provided with a plurality of grooves (206) evenly distributed around the cut hole (205); The support base (207) includes a connecting part (208) that slides with the groove (206), and the connecting part (208) is provided with an upwardly extending support part (209).

3. The infrared curing device for coating large butterfly valves according to claim 2, characterized in that, The top of the support part (209) is provided with a support block (210). One end of the support block (210) in the length direction is fixedly connected to the support part (209), and the other end extends away from the avoidance structure (204). The top side of the support block (210) is continuously provided with serrated protrusions (211) extending along the length direction of the support block (210).

4. The infrared curing device for coating large butterfly valves according to claim 1, characterized in that, The bottom of the first support (302) is provided with a rotary driver (301), which is used to drive the first support (302) to rotate around its own vertical central axis.

5. The infrared curing device for coating large butterfly valves according to claim 1, characterized in that, A third movable part (305) is provided above the first movable part (303). A first telescopic driver (304) for driving the third movable part (305) to rise and fall is provided between the third movable part (305) and the first movable part (303). A plurality of first hinge seats (306) are provided on both the first movable part (303) and the third movable part (305). The first hinge seats (306) on the first movable part (303) and the third movable part (305) are opposite each other in the vertical direction. The first infrared lamp (308) includes a vertically arranged first lamp holder (309). A first infrared lamp tube (310) is arranged on the side of the first lamp holder (309) away from the first movable part (303). Two first connecting rods (307) are hinged to the back of the first lamp holder (309). The ends of the two first connecting rods (307) away from the first lamp holder (309) are respectively hinged to the first hinge seat (306) on the first movable part (303) and the third movable part (305).

6. The infrared curing device for coating large butterfly valves according to claim 5, characterized in that, A third movable part (305) is provided above the first movable part (303). A first telescopic driver (304) for driving the third movable part (305) to rise and fall is provided between the third movable part (305) and the first movable part (303). A plurality of first hinge seats (306) are provided on both the first movable part (303) and the third movable part (305). The first hinge seats (306) on the first movable part (303) and the third movable part (305) are opposite each other in the vertical direction. The first infrared lamp (308) includes a vertically arranged first lamp holder (309), and a first infrared lamp tube (310) is arranged on the side of the first lamp holder (309) away from the first movable part (303); A third connecting rod (311) is hinged to the upper end of the back of the first lamp holder (309), and a sliding groove (312) extending along the length of the first lamp holder (309) is provided at the other end. A sliding block (313) is provided in the sliding groove (312) and slides therewith. A fourth connecting rod (314) is hinged on the sliding block (313). The middle part of the third connecting rod (311) is hinged to the middle part of the fourth connecting rod (314). The end of the third connecting rod (311) away from the first lamp holder (309) is hinged to the first hinge seat (306) on the first movable part (303). The end of the fourth connecting rod (314) away from the first lamp holder (309) is hinged to the first hinge seat (306) on the third movable part (305).

7. The infrared curing device for coating large butterfly valves according to claim 1, characterized in that, The mounting base (409) is cylindrical. A plurality of second hinge seats (412) are evenly distributed around the lower side of the mounting base (409). A second connecting rod (413) is hinged to the second hinge seat (412). One end of the second connecting rod (413) extends toward the inside of the mounting base (409), and the other end extends away from the mounting base (409). The end of the second connecting rod (413) near the inside of the mounting base (409) is provided with a U-shaped groove (414) in the vertical direction in the width direction. The mounting base (409) is provided with a second telescopic driver (410) on its inner side. The movable end of the second telescopic driver (410) is provided with a drive ring (411). The ring body of the drive ring (411) is freely embedded in the U-shaped groove (414). The movable end of the second telescopic driver (410) moves up and down to control the drive ring (411) to move up and down. The second infrared lamp (415) includes a second lamp holder (416), on which a second infrared lamp tube (417) is disposed on the side facing the central axis of the mounting base (409). The top of the second lamp holder (416) is hinged to the end of the second connecting rod (413) away from the mounting base (409). The second infrared lamp (415) is set in a vertical state under its own weight.

8. The infrared curing device for coating large butterfly valves according to claim 7, characterized in that, The second lamp holder (416) is C-shaped with its opening facing the central axis of the mounting base (409).

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