An environment-friendly spraying device for automobile accessories

Abstract

The present application relates to the technical field of spraying device, and specifically discloses an environment-friendly spraying device for automobile accessories, which comprises a ring conveying mechanism, a feeding station, a spraying mechanism, an appearance detection mechanism, a supplementary spraying mechanism, a baking station and a discharging station. The ring conveying mechanism is provided with a rotatable gear and a bidirectional clamp. The spraying mechanism comprises a paint spraying room, a mechanical arm, a first spraying head and a rack. When the clamp enters the paint spraying room, the gear can be engaged with the rack in the paint spraying room to drive the clamp to rotate by 180 degrees, so that the mechanical arm can spray the two automobile accessory outer sides on the clamp in turn. The appearance detection mechanism detects the sprayed accessories on line through an industrial camera, and the supplementary spraying mechanism performs paint supplement on the defect points according to the detection results. The present application realizes passive turning of the clamp by using the gear and the rack, simplifies the structure, improves the processing quantity and efficiency of single cycle, and improves the spraying quality and yield by combining online detection and supplementary spraying.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, and in particular to an environmentally friendly spraying device for automotive parts. Background Technology

[0002] After injection molding, automotive parts typically require paint spraying to achieve the desired color, appearance, and protective properties. This process demands a high degree of automation, uniform spraying, and consistent product quality; therefore, efficient automated painting equipment plays a crucial role in automotive parts production.

[0003] In the prior art, a typical automated spraying equipment solution can be found in Chinese Patent Publication No. CN105236761B. This solution discloses an automated spraying equipment for metal nano-mirror surfaces, in which an infrared heating and drying chamber and an automatic spraying chamber are integrated inside the spraying chamber. The equipment utilizes a workpiece conveying assembly to transport workpieces, employing a positionable rotating fixture with a rotary drive device to adjust the workpiece orientation. The automatic spraying chamber is equipped with multiple automatic spray guns driven by a three-axis robotic arm to achieve multi-angle spraying, and is equipped with dedicated air inlet and outlet components to maintain the environment.

[0004] However, the existing solutions described above have certain limitations. On the one hand, each positioning rotary fixture generally requires an independent rotary drive device to adjust the workpiece orientation, which undoubtedly increases the structural complexity and manufacturing cost of the equipment. On the other hand, the process involves direct drying and shaping after spraying, lacking an immediate online inspection and repair process for spraying quality. When uneven spraying or defects appear on the workpiece surface, they can usually only be screened out as defective products after drying, which not only wastes materials but also reduces overall production efficiency. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an environmentally friendly spraying device for automotive parts to solve the above problems.

[0006] An environmentally friendly spraying device for automotive parts, comprising: A ring conveyor mechanism, and a loading station, a spraying mechanism, a visual inspection mechanism, a touch-up spraying mechanism, a baking station and a unloading station arranged sequentially along the conveying direction of the ring conveyor mechanism; The annular conveying mechanism includes a conveying bracket, a circulating conveying module disposed on the conveying bracket, a plurality of support frames disposed at intervals on the circulating conveying module, a gear rotatably disposed on the support frame, and a bidirectional clamp fixed to the upper end of the gear shaft. The bidirectional clamp is used to simultaneously clamp two automotive parts placed in opposite directions. The spraying mechanism includes a spray booth, a robotic arm disposed outside the spray booth, a first nozzle connected to the execution end of the robotic arm, and a rack disposed inside the spray booth. The robotic arm can drive the first nozzle to extend into the spray booth to perform a spraying action. The circulating conveying module can drive the bidirectional clamp through the spray booth. The gear meshes with the rack inside the spray booth for transmission. The appearance inspection mechanism includes a side frame disposed on one side of the annular conveyor mechanism and two industrial cameras fixed to the upper end of the side frame, with the two industrial cameras respectively facing two automotive parts on the same bidirectional clamp; The touch-up spraying mechanism includes a drive module mounted on the side frame and a second nozzle connected to the output end of the drive module. The spraying direction of the second nozzle is adjustable.

[0007] Specifically, the circulating conveying module includes a chain that circulates along the conveying bracket, a drive motor fixed to one side of the conveying bracket, and a sprocket connected to the output shaft of the drive motor. The sprocket meshes with the chain for transmission. The chain is composed of multiple chain links that are hinged sequentially, and the support frame is fixedly mounted on the chain links.

[0008] Specifically, the axial bottom end of the gear is rotatably mounted on the support frame via a bearing.

[0009] Specifically, the bidirectional clamp includes a support rod fixed to the upper end of the gear shaft, two support frames fixed to the upper end of the support rod, and a press-type suction cup disposed on the support frame. The automotive parts are fixed by the support frame and / or the press-type suction cup.

[0010] Specifically, the robotic arm is a five-axis robotic arm, and the actuator of the robotic arm is also equipped with a camera.

[0011] Specifically, the spray booth is equipped with a water curtain plate. The top of the water curtain plate has an overflow trough, and the bottom has a lower channel for forming the water curtain. The side of the water curtain plate facing the first nozzle is the spraying area, and the side of the water curtain plate away from the first nozzle is the air extraction channel. The bottom of the air extraction channel has a water collection trough, and the top is connected to an air extraction device. The outside of the spray booth is equipped with a return flow device, which includes a water pump, a water pumping pipe connected to the water pump's inlet, and a water pumping pipe connected to the water pump's outlet. The water pumping pipe is connected to the water collection trough, and the water pumping pipe is connected to the overflow trough.

[0012] Specifically, the air extraction channel is provided with a water vapor separation layer, which includes multiple V-shaped plates arranged alternately in opposite directions along the vertical direction, and water vapor channels for airflow are formed between adjacent V-shaped plates.

[0013] Specifically, the drain pipe is also connected to a spray pipe, which extends into the air extraction channel and is located below the water vapor separation layer. The lower end of the spray pipe is provided with several spray holes.

[0014] Specifically, the two industrial cameras are respectively set on both sides of the conveying direction of the circulating conveying module, and the height and shooting angle of the industrial cameras are adjustable.

[0015] Specifically, the drive module includes a translation driver mounted on the side frame and aligned with the conveying direction of the circulating conveying module, a lifting driver mounted on the drive end of the translation driver, a rotary driver connected to the drive end of the lifting driver, and an L-shaped plate fixed to the drive end of the rotary driver. The second nozzle is mounted on the L-shaped plate, and the rotary driver can drive the second nozzle to adjust the spraying direction.

[0016] The beneficial effects of this invention are: 1. An environmentally friendly spraying device for automotive parts according to the present invention drives a bidirectional clamp to rotate through a passive steering mechanism composed of gears and a fixed rack. In conjunction with a robot arm, the outer surfaces of two automotive parts facing away from each other on the bidirectional clamp are sprayed sequentially in one spraying station. This realizes simultaneous processing and automatic switching of two parts in a single station, which significantly improves space utilization and processing efficiency per cycle. 2. This device integrates online appearance inspection and precise touch-up spraying functions, forming a process flow of spraying, inspection and immediate touch-up spraying, which effectively improves the product yield and reduces raw material waste; 3. At the same time, the circulating water curtain system and the built-in water vapor separation structure enhance the paint mist treatment effect and reflect the environmental protection design concept; 4. The overall solution has a clever structure, achieving efficient and high-quality automated spraying production with low mechanical complexity. Attached Figure Description

[0017] Figure 1 This is a perspective view of the environmentally friendly spraying device of this application; Figure 2 This is a top view of the environmentally friendly spraying device of this application; Figure 3 for Figure 2 A three-dimensional sectional view along line AA; Figure 4 This is a partial schematic diagram of the annular conveying mechanism of this application; Figure 5 This is a structural schematic diagram of the support frame, gear, two-way clamp, and automotive parts of this application; Figure 6 This is a schematic diagram of the spray booth and recirculation device of this application; Figure 7 This is a perspective sectional view of the spray booth and reflow device of this application.

[0018] The attached diagram is labeled as follows: 10 Circular conveyor mechanism, 20 loading station, 30 spraying mechanism, 40 appearance inspection mechanism, 50 touch-up spraying mechanism, 60 baking station, 70 unloading station, 11 conveyor support, 12 circulating conveyor module, 13 support frame, 14 gear, 15 bidirectional clamp, 80 automotive parts, 31 paint booth, 32 robotic arm, 33 first spray head, 34 rack, 41 side frame, 42 industrial camera, 51 drive module, 52 second spray head, and 1 chain. 21. Drive motor 122. Sprocket 123. Support rod 151. Support frame 152. Press-type suction cup 153. Water curtain plate 311. Overflow tank 312. Spraying area 313. Air extraction channel 314. Water collection tank 315. Return device 35. Water pump 351. Water extraction pipe 352. Drain pipe 353. Water vapor separation layer 36. Spray pipe 354. Translation driver 511. Lifting driver 512. Rotation driver 513. L-shaped plate 514. Detailed Implementation

[0019] This invention provides an environmentally friendly spraying device for automotive parts. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Please refer to Figures 1-7 : This embodiment discloses an environmentally friendly spraying device for automotive parts, comprising: The circular conveyor mechanism 10, along with the loading station 20, spraying mechanism 30, appearance inspection mechanism 40, respraying mechanism 50, baking station 60 and unloading station 70 arranged sequentially along the conveying direction of the circular conveyor mechanism 10, realizes a complete continuous operation from workpiece loading, automatic spraying, online quality inspection, immediate repair, drying and curing to final unloading, greatly improving the automation level and overall efficiency of spraying production.

[0022] like Figure 3As shown, the annular conveying mechanism 10 includes a conveying bracket 11, a circulating conveying module 12 disposed on the conveying bracket 11, a plurality of support frames 13 spaced apart on the circulating conveying module 12, a gear 14 rotatably disposed on the support frame 13, and a bidirectional clamp 15 fixed to the axial upper end of the gear 14. The bidirectional clamp 15 is used to simultaneously clamp two back-to-back automotive parts 80. The circulating conveying module 12 provides continuous circulating conveying power, and the combination of the gear 14 and the bidirectional clamp 15 constitutes an automatically steerable workstation, which allows one workstation to simultaneously carry and rotate two back-to-back automotive parts 80, effectively utilizing the painting workstation space.

[0023] like Figure 3 As shown, the spraying mechanism 30 includes a spray booth 31, a robotic arm 32 disposed outside the spray booth 31, a first nozzle 33 connected to the execution end of the robotic arm 32, and a rack 34 disposed inside the spray booth 31. The robotic arm 32 can drive the first nozzle 33 to extend into the spray booth 31 to perform spraying actions. The circulating conveying module 12 can drive the bidirectional clamp 15 through the spray booth 31. The gear 14 meshes with the rack 34 for transmission inside the spray booth 31. Specifically, when the support frame 13 carries... When gear 14 and bidirectional clamp 15 enter the paint booth 31, gear 14 and rack 34 are disengaged. The robotic arm 32 drives the first spray head 33 to spray one of the automotive parts 80. During a specific travel segment within the paint booth 31, gear 14 engages with the fixed rack 34. As the conveyor travels, this engagement drives gear 14 and bidirectional clamp 15 to rotate 180 degrees together, thus turning the other automotive part 80 towards the first spray head 33 for spraying. After the turning is complete, gear 14 disengages from rack 34. The length of this engagement stroke is carefully designed to ensure that gear 14 rotates exactly 180 degrees, enabling automatic switching between the two automotive parts 80.

[0024] like Figure 3 As shown, the appearance inspection mechanism 40 includes a side frame 41 set on one side of the circular conveyor mechanism 10, and two industrial cameras 42 fixed on the upper end of the side frame 41. The two industrial cameras 42 are respectively facing two automotive parts 80 on the same bidirectional clamp 15. This design enables synchronous image acquisition of the outer surfaces of the two automotive parts 80 side by side on the bidirectional clamp 15 during the conveying process without any additional process interruption, providing real-time and comprehensive visual information for subsequent online quality judgment.

[0025] like Figure 3As shown, the touch-up spraying mechanism 50 includes a drive module 51 mounted on the side frame 41 and a second nozzle 52 connected to the output end of the drive module 51. The spraying direction of the second nozzle 52 is adjustable. The drive module 51 can drive the second nozzle 52 to move and adjust its posture according to the recognition result of the appearance inspection mechanism 40, and perform local touch-up painting on the detected spraying defects, effectively improving the yield.

[0026] The overall workflow and technical effects of this device are as follows: At the loading station 20, the operator mounts two automotive parts 80 back-to-back onto the bidirectional clamp 15. The circulating conveyor module 12 feeds the workpiece into the spraying mechanism 30. Inside the spray booth 31, the robotic arm 32 drives the first spray nozzle 33 to spray the outer surface of the first automotive part 80 located in front of it. Subsequently, during the conveying process, the clamp rotates 180 degrees through the meshing of gear 14 and rack 34, causing the second automotive part 80 to turn towards the first spray nozzle 33, and the robotic arm 32 completes the spraying of its outer surface. After spraying, the automotive parts 80 are then conveyed to the appearance inspection mechanism 40, where two industrial cameras 42 photograph and analyze the outer surfaces of the two automotive parts 80. If a defect is detected, the control system records the position of the automotive part 80 on the circulating conveyor module 12. When the defective automotive part 80 reaches the re-spraying mechanism 50, the drive module 51 drives the second spray nozzle 52 to re-spray the defective point. Afterwards, the automotive parts 80 enter the baking station 60 for drying and curing, and finally are unloaded at the unloading station 70. This solution effectively improves the processing quantity, production efficiency, and product yield per conveying cycle through spraying, online inspection, and immediate touch-up spraying. Simultaneously, the passive steering mechanism of gear 14 and rack 34 avoids the need to install an independent drive motor on each bidirectional clamp 15, significantly reducing equipment manufacturing costs.

[0027] like Figure 4 As shown, the circulating conveying module 12 includes a chain 121 that circulates along the conveying support 11, a drive motor 122 fixed to one side of the conveying support 11, and a sprocket 123 connected to the output shaft of the drive motor 122. The sprocket 123 meshes with the chain 121 for transmission. The chain 121 is composed of multiple chain links that are hinged sequentially, and a support frame 13 is fixedly mounted on the chain links. This structure provides stable and reliable circulating conveying power. The chain 121 structure ensures the accuracy of workpiece positioning and the consistency of movement trajectory, providing a precise workstation foundation for subsequent automatic spraying, turning, and inspection operations.

[0028] Furthermore, the axial bottom end of gear 14 is rotatably mounted on support frame 13 via bearings. This design ensures that gear 14 can rotate smoothly under load with low frictional resistance, thereby guaranteeing the accuracy and reliability of 180-degree steering.

[0029] like Figure 5 As shown, the bidirectional clamp 15 includes a support rod 151 fixed to the upper axial end of the gear 14, two support frames 152 fixed to the upper end of the support rod 151, and a press-type suction cup 153 disposed on the support frame 152. The automotive part 80 is fixed by the support frame 152 and / or the press-type suction cup 153. This clamp design provides multiple fixing methods, enabling both support and positioning through the support frame 152 and stable suction force through the press-type suction cup 153. It is particularly suitable for automotive parts 80 with irregular shapes or smooth surfaces, exhibiting excellent versatility and stability.

[0030] Furthermore, the robotic arm 32 is a five-axis robotic arm, and its actuator is also equipped with a camera. The five-axis robotic arm gives the first spray head 33 extremely high mobility, enabling it to spray the outer surface of complex curved workpieces at the optimal angle and trajectory. The additional camera can assist in the initial positioning of the workpiece or simple pre-observation of the spraying quality.

[0031] like Figure 6 and Figure 7 As shown, the spray booth 31 is equipped with a water curtain plate 311. The top of the water curtain plate 311 is equipped with an overflow trough 312, and the bottom is equipped with a lower channel for forming a water curtain. The side of the water curtain plate 311 facing the first nozzle 33 is the spraying area 313, and the side of the water curtain plate 311 away from the first nozzle 33 is the exhaust channel 314. The bottom of the exhaust channel 314 is equipped with a water collection trough 315, and the top is connected to an exhaust device. The outside of the spray booth 31 is equipped with a return device 35. The return device 35 includes a water pump 351, a water suction pipe 352 connected to the water pump 351's water inlet, and a drain pipe 353 connected to the water pump 351's drain outlet. The water suction pipe 352 is connected to the water collection trough 315, and the drain pipe 353 is connected to the overflow trough 312. The water curtain plate 311 forms a continuous downward water curtain between the spraying area 313 and the exhaust channel 314, which can effectively absorb and carry away oversprayed paint mist particles, thus purifying the air. The contaminated circulating water is collected in the water collection tank 315, and after being lifted by the water pump 351, it can flow back to the overflow tank 312 to reform the water curtain, realizing the recycling of water resources and promoting environmental protection and energy conservation.

[0032] Furthermore, a water vapor separation layer 36 is provided within the air extraction channel 314. The water vapor separation layer 36 includes multiple V-shaped plates arranged alternately in opposite directions along the vertical direction, forming water vapor channels between adjacent V-shaped plates for airflow. When the mixed airflow containing paint mist and water vapor passes through the water vapor separation layer 36, its flow direction continuously changes within the tortuous channels of the V-shaped plates, causing water droplets and heavier water vapor particles to be separated by inertia and collisions with the wall surface. This improves the air-water separation efficiency and protects the subsequent air extraction device.

[0033] Furthermore, the drain pipe 353 is also connected to a spray pipe 354, which extends into the air extraction channel 314 and is located below the water vapor separation layer 36. The lower end of the spray pipe 354 is provided with several spray holes. The spray pipe 354 can spray a portion of the circulating water downwards, forming a water curtain at the lower part of the air extraction channel 314. This provides initial washing to the airflow entering the channel, further removing paint mist, and supplementing the separation process of the water vapor separation layer 36 above, thus enhancing the overall paint mist treatment effect.

[0034] Furthermore, two industrial cameras 42 are respectively positioned on both sides of the conveying direction of the circulating conveyor module 12, and the height and shooting angle of the industrial cameras 42 are adjustable. This symmetrical arrangement and adjustability ensure that the two industrial cameras 42 can capture images of the outer side surfaces of the two workpieces on the bidirectional clamp 15 from the optimal viewing angle, adapting to automotive parts 80 of different sizes and shapes, and improving the accuracy and versatility of inspection.

[0035] like Figure 3 As shown, the drive module 51 includes a translation driver 511 mounted on the side frame 41 and aligned with the conveying direction of the circulating conveyor module 12; a lifting driver 512 mounted on the drive end of the translation driver 511; a rotary driver 513 connected to the drive end of the lifting driver 512; and an L-shaped plate 514 fixed to the drive end of the rotary driver 513. A second nozzle 52 is mounted on the L-shaped plate 514. The rotary driver 513 can drive the second nozzle 52 to adjust its spraying direction. The translation driver 511 can be implemented using a combination of a linear guide rail and a motor screw, controlling the second nozzle 52 to move along the conveyor line to track the automotive part 80, achieving the effect of simultaneous movement and touch-up spraying. The lifting driver 512 uses a cylinder to quickly adjust the height of the second nozzle 52. The rotary driver 513 uses a motor to precisely control the spray angle of the second nozzle 52. The three components work together to give the second nozzle 52 multi-degree-of-freedom movement capability, enabling it to accurately locate any defect position on the surface of the automotive part 80 and perform touch-up spraying.

[0036] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. An environmentally friendly spraying device for automotive parts, characterized in that, include: The ring conveyor (10) and the loading station (20), spraying mechanism (30), appearance inspection mechanism (40), respraying mechanism (50), baking station (60) and unloading station (70) are arranged sequentially along the conveying direction of the ring conveyor (10). The annular conveying mechanism (10) includes a conveying bracket (11), a circulating conveying module (12) disposed on the conveying bracket (11), a plurality of support frames (13) spaced apart on the circulating conveying module (12), a gear (14) rotatably disposed on the support frame (13), and a bidirectional clamp (15) fixed to the upper axial end of the gear (14). The bidirectional clamp (15) is used to simultaneously clamp two back-to-back automotive parts (80). The spraying mechanism (30) includes a spray booth (31), a robot arm (32) disposed outside the spray booth (31), a first nozzle (33) connected to the execution end of the robot arm (32), and a rack (34) disposed inside the spray booth (31). The robot arm (32) can drive the first nozzle (33) to extend into the spray booth (31) to perform spraying action. The circulating conveying module (12) can drive the bidirectional clamp (15) through the spray booth (31). The gear (14) meshes with the rack (34) inside the spray booth (31) for transmission. The appearance inspection mechanism (40) includes a side frame (41) disposed on one side of the annular conveyor (10) and two industrial cameras (42) fixed on the upper end of the side frame (41). The two industrial cameras (42) are respectively facing two automotive parts (80) on the same bidirectional clamp (15). The respraying mechanism (50) includes a drive module (51) mounted on the side frame (41) and a second nozzle (52) connected to the output end of the drive module (51), wherein the spraying direction of the second nozzle (52) is adjustable.

2. The environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The circulating conveying module (12) includes a chain (121) that moves cyclically along the conveying bracket (11), a drive motor (122) fixed to one side of the conveying bracket (11), and a sprocket (123) connected to the output shaft of the drive motor (122). The sprocket (123) meshes with the chain (121) for transmission. The chain (121) is composed of multiple chain links that are hinged in sequence. The support frame (13) is fixedly mounted on the chain links.

3. The environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The axial bottom end of the gear (14) is rotatably mounted on the support frame (13) via a bearing.

4. The environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The bidirectional clamp (15) includes a support rod (151) fixed to the upper axial end of the gear (14), two support frames (152) fixed to the upper end of the support rod (151), and a press-type suction cup (153) provided on the support frame (152). The automotive part (80) is fixed by the support frame (152) and / or the press-type suction cup (153).

5. An environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The robotic arm (32) is a five-axis robotic arm, and the actuator of the robotic arm (32) is also equipped with a camera.

6. The environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The spray booth (31) is equipped with a water curtain plate (311). The top of the water curtain plate (311) is provided with an overflow trough (312), and the bottom is provided with a lower channel for forming a water curtain. The side of the water curtain plate (311) facing the first spray head (33) is the spraying area (313), and the side of the water curtain plate (311) away from the first spray head (33) is the exhaust channel (314). The bottom of the exhaust channel (314) is provided with a water collection trough (312). 5) An air extraction device is connected to the top. A return flow device (35) is provided on the outside of the spray booth (31). The return flow device (35) includes a water pump (351), a water pump pipe (352) connected to the water pump (351) inlet, and a water pump pipe (353) connected to the water pump (351) outlet. The water pump pipe (352) is connected to the water collection tank (315), and the water pump pipe (353) is connected to the overflow tank (312).

7. An environmentally friendly spraying device for automotive parts according to claim 6, characterized in that, The air extraction channel (314) is provided with a water vapor separation layer (36), which includes a plurality of V-shaped plates arranged alternately in the vertical direction, and a water vapor channel for airflow is formed between adjacent V-shaped plates.

8. An environmentally friendly spraying device for automotive parts according to claim 7, characterized in that, The drain pipe (353) is also connected to a spray pipe (354), which extends into the air extraction channel (314) and is located below the water vapor separation layer (36). The lower end of the spray pipe (354) is provided with several spray holes.

9. An environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The two industrial cameras (42) are respectively set on both sides of the conveying direction of the circulating conveying module (12), and the height and shooting angle of the industrial cameras (42) are adjustable.

10. An environmentally friendly spraying device for automotive parts according to claim 1, characterized in that, The drive module (51) includes a translation driver (511) disposed on the side frame (41) and in the same direction as the conveying of the circulating conveying module (12), a lifting driver (512) disposed at the driving end of the translation driver (511), a rotary driver (513) connected to the driving end of the lifting driver (512), and an L-shaped plate (514) fixed at the driving end of the rotary driver (513). The second nozzle (52) is mounted on the L-shaped plate (514), and the rotary driver (513) can drive the second nozzle (52) to adjust the spraying direction.

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