A surface paint spraying device for an automobile sheet metal part

Abstract

This invention belongs to the field of surface painting technology, specifically referring to a surface painting device for automotive sheet metal parts. It includes a ring-shaped pitch assembly, a control assembly, a spring-loaded assembly, a pressing assembly, an arc adjustment assembly, a probe assembly, a sliding assembly, and a spray head. The ring-shaped pitch assembly is mounted on the sliding assembly, the control assembly is mounted on the ring-shaped pitch assembly, the spring-loaded assembly is positioned between the ring-shaped pitch assemblies, and the pressing assembly is mounted on the ring-shaped pitch assembly. This invention, through the arc adjustment of the ring-shaped pitch assembly, enables the painting area to match workpieces of different diameters, thereby allowing the spray head to achieve comprehensive painting coverage of the workpiece surface through one or a few linear slides.

Description

Technical Field

[0001] This invention belongs to the field of surface painting technology, specifically referring to a surface painting device for automotive sheet metal parts. Background Technology

[0002] Automotive sheet metal parts are mainly divided into flat panels (body panels such as doors and fenders) and long strips (door anti-collision strips, sill inner panels, sunroof brackets, guide rail bases, etc.) in terms of shape. These parts need to be painted as a whole after production or repair.

[0003] For flat parts, due to their varied shapes and the high requirements for paint smoothness, most parts are currently handled and painted using robotic arms. Although robotic arms are expensive, they offer far greater control freedom and versatility than other methods.

[0004] The surface painting process for long, narrow parts is completely different:

[0005] Firstly, these types of parts are mostly hidden in areas not visible on the vehicle, so painting is only for rust prevention and there are no major requirements for aesthetics; secondly, these parts have a simple outer contour, and generally only differ in length and diameter.

[0006] Given this reality, if the common robotic arm solution is still used for painting operations, it will actually result in a waste of equipment and operating costs.

[0007] Furthermore, for maintenance organizations, using robotic arms for control requires writing control codes that can be reused very infrequently for specific parts, which is also a cost burden. Summary of the Invention

[0008] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a surface painting device for automotive sheet metal parts. By adjusting the curvature of the circumferential pitch component, the painting area can be matched to workpieces of different diameters, allowing the spray head to achieve comprehensive coating coverage of the workpiece surface through one or a few linear slides. Furthermore, to accommodate operators with varying experience, this invention also includes different operating modes. When extended, the probe component can retract after contacting the workpiece, providing a non-subjective auxiliary judgment of the adjustment range of the circumferential pitch component, thus offering operational guidance for less experienced operators.

[0009] The technical solution adopted by this invention is as follows: This invention proposes a surface painting device for automotive sheet metal parts, including a ring-shaped pitch assembly, a control assembly, a spring-loaded assembly, a pressing assembly, an arc adjustment assembly, a probe assembly, a sliding assembly, and a spray head. The ring-shaped pitch assembly is disposed on the sliding assembly, the control assembly is disposed on the ring-shaped pitch assembly, the spring-loaded assembly is disposed between the ring-shaped pitch assemblies, the pressing assembly is disposed on the ring-shaped pitch assembly, the arc adjustment assembly is disposed on the sliding assembly, the probe assembly is slidably disposed in the arc adjustment assembly, and the spray head is fixedly connected to the ring-shaped pitch assembly.

[0010] Furthermore, the encircling pitch assembly includes a fixed section, an intermediate section, an end section, and a hinge pin. The fixed section is fixedly connected to the sliding assembly, the intermediate section is rotatably mounted on the fixed section via the hinge pin, and the end section is rotatably mounted on the intermediate section.

[0011] By adjusting the curvature of the circumferential pitch component, the spraying area can be matched with workpieces of different diameters, allowing the spray head to achieve full spraying coverage of the workpiece surface through one or a few linear slides.

[0012] Furthermore, the control component includes a torsion guide wheel, a drive belt, and a winding drum. The torsion guide wheel is fixed to the intermediate section and the end section. One end of the drive belt is fixed to the end section, and the other end of the drive belt is fixed to the winding drum. When the winding drum rotates, it can control the winding and unwinding of the drive belt.

[0013] The spring force of each set of spring-loaded components is the same and significantly greater than the weight of the middle and end sections. Under the action of the spring force of the spring-loaded components, the angles between the sections of the ring-shaped pitch component can be approximately the same. Thus, the angles of multiple sections of the ring-shaped pitch component can be adjusted uniformly and synchronously by only the movement of the drive belt.

[0014] Furthermore, the pressing assembly includes a swing fork and an upper pressure roller. The swing fork is rotatably mounted on a hinge pin, and the upper pressure roller is rotatably mounted in the swing fork. The transmission belt is located between the torsion guide pulley and the upper pressure roller.

[0015] The pressure from the upper rollers ensures that the drive belt and the torsion guide pulley remain in contact, thereby improving stability and reducing the risk of the drive belt becoming loose.

[0016] Furthermore, the sliding assembly includes a cantilever bracket, the fixed section is fixedly connected to the end of the cantilever bracket, the arc adjustment assembly includes a winding bracket and a winding shaft, the winding bracket is fixedly connected to the fixed section, the winding shaft is rotatably disposed in the winding bracket, the winding shaft can be locked and unlocked, and the winding roller is fixedly connected to the winding shaft.

[0017] Furthermore, the curvature adjustment assembly also includes a winding gear, a rack guide rail, and a sliding rack. The winding gear is fixed to the winding shaft, the rack guide rail is fixed to the side of the cantilever bracket, and the sliding rack is engaged and slidably disposed on the rack guide rail. The sliding rack and the winding gear mesh and transmit power.

[0018] By rotating the winding shaft, the axial sliding of the sliding rack can be controlled while adjusting the curvature of the circumferential pitch assembly. This achieves the technical objective of assisting in determining the curvature setting value of the circumferential pitch assembly by moving the position of the probe assembly.

[0019] Furthermore, the probe assembly includes a telescopic probe, an elastic buckle, an elastic pin, and a return spring. The telescopic probe is engaged and slidably disposed in the sliding rack. The elastic buckle is fixed to the end face of the sliding rack. The elastic pin is fixed to the telescopic probe. The return spring is disposed between the sliding rack and the telescopic probe.

[0020] When the probe assembly is extended, it can retract after pressing against the workpiece, thereby providing a non-subjective auxiliary judgment on the adjustment range of the encircling pitch assembly and providing an operational basis for inexperienced operators.

[0021] Furthermore, the rebound assembly includes an arc-shaped sleeve, an arc-shaped slide rod, and a return spring. The rebound assembly is disposed between adjacent sections of the circumferential pitch assembly. The arc-shaped sleeve and the arc-shaped slide rod are respectively disposed on two adjacent sections. The return spring is disposed in the arc-shaped sleeve. Under the elastic force of the return spring, the arc-shaped slide rod has a tendency to retract toward the arc-shaped sleeve.

[0022] Furthermore, the sliding assembly also includes a sliding plate and a slider, the cantilever bracket is disposed on the sliding plate, the slider is disposed below the sliding plate, the sliding assembly is driven by an external linear module, and the nozzle is fixedly connected to the fixed section, the intermediate section and the end section.

[0023] Furthermore, the torsion guide pulley and transmission belt can be configured as a toothed synchronous pulley and belt.

[0024] The beneficial effects achieved by the present invention using the above structure are as follows:

[0025] (1) By adjusting the curvature of the circumferential pitch component, the spraying area can be matched with workpieces of different diameters, so that the nozzle can achieve full spraying coverage of the workpiece surface through one or a few linear sliding movements.

[0026] (2) The spring force of each group of spring components is the same and significantly greater than the weight of the middle section and the end section. Under the action of the spring force of the spring components, the angle between each section of the ring-shaped pitch component can be approximately the same. Thus, the angle of multiple sections of the ring-shaped pitch component can be adjusted uniformly and synchronously by only the movement of the transmission belt.

[0027] (3) The pressure of the upper pressure roller can keep the transmission belt and the torsion guide wheel in contact, thereby improving stability and reducing the risk of the transmission belt loosening.

[0028] (4) By rotating the winding shaft, the axial sliding of the sliding rack can be controlled while adjusting the curvature of the circumferential pitch component, thereby achieving the technical objective of assisting in judging the curvature setting value of the circumferential pitch component by moving the position of the probe component.

[0029] (5) When the probe assembly is in the extended state, it can retract after pressing against the workpiece, thereby providing a non-subjective auxiliary judgment on the adjustment range of the circumferential pitch assembly, which can provide an operational basis for operators with insufficient experience. Attached Figure Description

[0030] Figure 1 This is a perspective view of a surface painting device for automotive sheet metal parts proposed in this invention;

[0031] Figure 2 This is a front view of a surface painting device for automotive sheet metal parts proposed in this invention;

[0032] Figure 3 This is a left view of a surface painting device for automotive sheet metal parts proposed in this invention;

[0033] Figure 4 for Figure 3 A cross-sectional view along the cutting line AA;

[0034] Figure 5 for Figure 2 A cross-sectional view along the cutting line BB;

[0035] Figure 6 for Figure 5 A cross-sectional view along the section line CC;

[0036] Figure 7 for Figure 4 A magnified view of a section at point I;

[0037] Figure 8 for Figure 1 Enlarged view of a section at point II;

[0038] Figure 9 for Figure 6 A magnified view of section III in the middle.

[0039] The components include: 1. Encircling pitch assembly; 2. Control assembly; 3. Rebound assembly; 4. Pressing assembly; 5. Curvature adjustment assembly; 6. Probe assembly; 7. Sliding assembly; 8. Nozzle; 11. Fixed section; 12. Intermediate section; 13. End section; 14. Hinge pin; 21. Torsion guide wheel; 22. Drive belt; 23. Winding roller; 31. Arc sleeve; 32. Arc slide bar; 33. Return spring; 41. Swing fork; 42. Upper pressure roller; 51. Winding bracket; 52. Winding shaft; 53. Winding gear; 54. Rack and pinion guide; 55. Sliding rack; 61. Telescopic probe; 62. Elastic buckle; 63. Elastic pin; 64. Return spring; 71. Slide plate; 72. Cantilever bracket; 73. Slider.

[0040] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship 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 limitations on this invention.

[0043] like Figures 1-9 As shown, the present invention proposes a surface painting device for automotive sheet metal parts, including a ring-shaped pitch assembly 1, a control assembly 2, a spring-loaded assembly 3, a pressing assembly 4, an arc adjustment assembly 5, a probe assembly 6, a sliding assembly 7, and a nozzle 8. The ring-shaped pitch assembly 1 is disposed on the sliding assembly 7, the control assembly 2 is disposed on the ring-shaped pitch assembly 1, the spring-loaded assembly 3 is disposed between the ring-shaped pitch assemblies 1, the pressing assembly 4 is disposed on the ring-shaped pitch assembly 1, the arc adjustment assembly 5 is disposed on the sliding assembly 7, the probe assembly 6 is slidably disposed in the arc adjustment assembly 5, and the nozzle 8 is fixedly connected to the ring-shaped pitch assembly 1.

[0044] The encircling pitch assembly 1 includes a fixed section 11, an intermediate section 12, an end section 13, and a hinge pin 14. The fixed section 11 is fixed to the sliding assembly 7. The intermediate section 12 is rotatably mounted on the fixed section 11 via the hinge pin 14. The end section 13 is rotatably mounted on the intermediate section 12.

[0045] By adjusting the curvature of the circumferential pitch component 1, the spraying area can be matched with workpieces of different diameters, thereby enabling the nozzle 8 to achieve full spraying coverage of the workpiece surface through one or a few linear slides.

[0046] The control component 2 includes a torsion guide wheel 21, a transmission belt 22, and a winding drum 23. The torsion guide wheel 21 is fixed to the intermediate section 12 and the end section 13. One end of the transmission belt 22 is fixed to the end section 13, and the other end of the transmission belt 22 is fixed to the winding drum 23. When the winding drum 23 rotates, it can control the winding and unwinding of the transmission belt 22.

[0047] The spring force of each set of spring-loaded components 3 is the same and significantly greater than the weight of the middle section 12 and the end section 13. Under the action of the spring force of the spring-loaded components 3, the angle between each section of the ring-shaped pitch component 1 can be approximately the same. Thus, the angle of multiple sections of the ring-shaped pitch component 1 can be adjusted uniformly and synchronously by only the movement of the transmission belt 22.

[0048] The pressing assembly 4 includes a swing fork 41 and an upper pressure roller 42. The swing fork 41 is rotatably mounted on the hinge pin 14, and the upper pressure roller 42 is rotatably mounted in the swing fork 41. The transmission belt 22 is located between the torsion guide wheel 21 and the upper pressure roller 42.

[0049] The pressure from the upper roller 42 ensures that the drive belt 22 and the torsion guide wheel 21 remain in contact, thereby improving stability and reducing the risk of the drive belt 22 becoming loose.

[0050] The sliding assembly 7 includes a cantilever bracket 72, and a fixed section 11 is fixedly connected to the end of the cantilever bracket 72. The arc adjustment assembly 5 includes a winding bracket 51 and a winding shaft 52. The winding bracket 51 is fixedly connected to the fixed section 11, and the winding shaft 52 is rotatably disposed in the winding bracket 51. The winding shaft 52 can be locked and unlocked, and the winding roller 23 is fixedly connected to the winding shaft 52.

[0051] The arc adjustment component 5 also includes a winding gear 53, a rack guide rail 54, and a sliding rack 55. The winding gear 53 is fixed to the winding shaft 52, the rack guide rail 54 is fixed to the side of the cantilever bracket 72, and the sliding rack 55 is engaged and slidably disposed on the rack guide rail 54. The sliding rack 55 and the winding gear 53 mesh and drive each other. The probe assembly 6 is slidably disposed inside the sliding rack 55.

[0052] By rotating the winding shaft 52, the axial sliding of the sliding rack 55 can be controlled while adjusting the curvature of the circumferential pitch assembly 1, thereby achieving the technical objective of assisting in judging the curvature setting value of the circumferential pitch assembly 1 by moving the position of the probe assembly 6.

[0053] The probe assembly 6 includes a telescopic probe 61, an elastic buckle 62, an elastic pin 63, and a return spring 64. The telescopic probe 61 is engaged and slidably disposed in the sliding rack 55. The elastic buckle 62 is fixedly connected to the end face of the sliding rack 55. The elastic pin 63 is fixedly connected to the telescopic probe 61. The return spring 64 is disposed between the sliding rack 55 and the telescopic probe 61.

[0054] When the probe assembly 6 is extended, it can retract after pressing against the workpiece, thereby providing a non-subjective auxiliary judgment on the adjustment range of the encircling pitch assembly 1, and providing an operational basis for operators with insufficient experience.

[0055] The springback assembly 3 includes an arc-shaped sleeve 31, an arc-shaped slide bar 32, and a return spring 33. The springback assembly 3 is located between adjacent sections of the ring-shaped pitch assembly 1. The arc-shaped sleeve 31 and the arc-shaped slide bar 32 are respectively located on two adjacent sections. The return spring 33 is located in the arc-shaped sleeve 31. Under the elastic force of the return spring 33, the arc-shaped slide bar 32 has a tendency to retract into the arc-shaped sleeve 31.

[0056] The sliding assembly 7 also includes a slide plate 71 and a slider 73. The cantilever bracket 72 is mounted on the slide plate 71, and the slider 73 is mounted below the slide plate 71. The sliding assembly 7 is driven by an external linear module, and the nozzle 8 is fixed to the fixed section 11, the intermediate section 12, and the end section 13.

[0057] The torsion guide pulley 21 and the transmission belt 22 can be configured as a toothed synchronous pulley and belt.

[0058] In practical use, the workpiece first needs to be fixed on the external clamp. The length direction of the workpiece is set along the sliding direction of the sliding component 7. Then, according to the approximate diameter of the workpiece, the bending amplitude of the circumferential pitch component 1 is adjusted. After the adjustment is completed, the sliding component 7 is driven to slide along the length direction of the workpiece through the linear unit, and the nozzle 8 is opened at the same time.

[0059] If the encircling pitch assembly 1 can form a complete ring, then the sliding assembly 7 only needs to perform one linear movement; if the encircling pitch assembly 1 cannot form a complete ring, then the sliding assembly 7 needs to perform multiple linear movements. After each movement to the end, the fixture needs to control the workpiece to rotate a certain angle. The angle of a single rotation should be related to the coverage angle of the encircling pitch assembly 1, so as to ensure that the product can finally achieve full coverage of the paint surface.

[0060] The adjustment methods for the encircling pitch assembly 1 are divided into the following three types:

[0061] Visual inspection and manual operation: In this mode, the operator can freely control and adjust the range. At this time, the arc adjustment component 5 and the probe component 6 are not set. The workpiece is installed on the fixture. At this time, the center of the workpiece is roughly coincident with the center of the circle after the encircling pitch component 1 is fully closed. Then, the locking of the winding shaft 52 is released, and the winding shaft 52 is manually rotated. In the initial state, the encircling pitch component 1 is in a vertically open state. By rotating the winding shaft 52, the transmission belt 22 is released, so that each section of the encircling pitch component 1 rotates under the elastic force of the spring component 3.

[0062] Since the spring force of the spring-rebound assembly 3 between each section is the same and significantly greater than the weight of the middle section 12 and the end section 13, under the action of the spring force of the spring-rebound assembly 3, the angle between each section of the circumferential pitch assembly 1 can be approximately the same until the difference between the equivalent diameter of the circumferential pitch assembly 1 and the outer diameter of the workpiece reaches the optimal distance for painting, the adjustment is completed and the winding shaft 52 is locked.

[0063] If the wrap-around pitch assembly 1 is completely closed into a regular polygon, the winding shaft 52 can also be locked.

[0064] If the circumferential pitch assembly 1 does not close into a regular polygon when the winding shaft 52 is locked, then the center of the circumferential pitch assembly 1 does not coincide with the center of the workpiece. In this case, by adjusting the distance between the workpiece and the sliding assembly 7, the two can be made to roughly coincide.

[0065] The reset and closing processes of the ring-type pitch assembly 1 are reversed.

[0066] Mechanically assisted manual operation: The main operating steps in this mode are the same as those in the visual inspection mode, but the arc adjustment component 5 and the probe component 6 need to be installed. First, the telescopic probe 61 is turned into the extended state, and the position of the telescopic probe 61 is maintained by the elastic buckle 62 and the elastic pin 63; while the winding shaft 52 is rotating, it will push the sliding rack 55 closer to the workpiece.

[0067] Within a certain range: the smaller the diameter of the workpiece, the later the telescopic probe 61 contacts the workpiece, and the smaller the equivalent diameter of the circumferential pitch assembly 1; the larger the diameter of the workpiece, the earlier the telescopic probe 61 contacts the workpiece, and the larger the equivalent diameter of the circumferential pitch assembly 1. Through the indication of the arc adjustment assembly 5 and the probe assembly 6, the difference between the equivalent diameter of the circumferential pitch assembly 1 and the outer diameter of the workpiece can be kept basically constant when the telescopic probe 61 contacts the workpiece.

[0068] After the telescopic probe 61 comes into contact with the workpiece, the winding shaft 52 continues to rotate by a very small amount. The elastic pin 63 will then overcome the elastic force of the elastic buckle 62 and separate from the elastic buckle 62. After that, the telescopic probe 61 will retract into the sliding rack 55, without affecting the subsequent relative sliding of the nozzle 8 and the workpiece.

[0069] Mechanically assisted automatic operation: The main working steps in this mode are the same as those in the mechanically assisted manual mode. The difference is that the winding shaft 52 is driven by a motor; a sensor needs to be installed between the telescopic probe 61 and the sliding rack 55. The sensor senses the rebound timing of the telescopic probe 61 and automatically stops releasing the transmission belt 22 and locks the winding shaft 52 when the telescopic probe 61 rebounds.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A surface paint spraying device for automobile sheet metal parts, comprising a sliding assembly (7) and a spray head (8), characterized in that: It also includes a ring-shaped pitch assembly (1), a control assembly (2), a rebound assembly (3), a pressing assembly (4), an arc adjustment assembly (5), and a probe assembly (6). The ring-shaped pitch assembly (1) is mounted on the sliding assembly (7), the control assembly (2) is mounted on the ring-shaped pitch assembly (1), the rebound assembly (3) is located between the ring-shaped pitch assemblies (1), and the pressing assembly (4) is mounted on the ring-shaped pitch assembly (1). The arc adjustment component (5) is mounted on the sliding component (7), the probe component (6) is slidably mounted in the arc adjustment component (5), and the nozzle (8) is fixedly mounted on the circumferential pitch component (1). The encircling pitch assembly (1) includes a fixed section (11), an intermediate section (12), an end section (13), and a hinge pin (14). The fixed section (11) is fixed to the sliding assembly (7). The intermediate section (12) is rotatably mounted on the fixed section (11) via the hinge pin (14). The end section (13) is rotatably mounted on the intermediate section (12). The control component (2) includes a torsion guide wheel (21), a transmission belt (22), and a winding drum (23). The torsion guide wheel (21) is fixed to the intermediate section (12) and the end section (13). One end of the transmission belt (22) is fixed to the end section (13), and the other end of the transmission belt (22) is fixed to the winding drum (23). When the winding drum (23) rotates, it can control the winding and unwinding of the transmission belt (22). The pressing assembly (4) includes a swing fork (41) and an upper pressure roller (42). The swing fork (41) is rotatably mounted on a hinge pin (14), and the upper pressure roller (42) is rotatably mounted in the swing fork (41). The transmission belt (22) is located between the torsion guide wheel (21) and the upper pressure roller (42). The sliding assembly (7) includes a cantilever bracket (72), the fixed section (11) is fixed to the end of the cantilever bracket (72), the arc adjustment assembly (5) includes a winding bracket (51) and a winding shaft (52), the winding bracket (51) is fixed to the fixed section (11), the winding shaft (52) is rotatably disposed in the winding bracket (51), and the winding roller (23) is fixed to the winding shaft (52); The arc adjustment component (5) further includes a winding gear (53), a rack guide rail (54), and a sliding rack (55). The winding gear (53) is fixed to the winding shaft (52), the rack guide rail (54) is fixed to the side of the cantilever bracket (72), and the sliding rack (55) is engaged and slidably disposed on the rack guide rail (54). The sliding rack (55) and the winding gear (53) mesh and transmit power. The probe assembly (6) includes a telescopic probe (61), an elastic buckle (62), an elastic pin (63), and a return spring (64). The telescopic probe (61) is engaged and slidably disposed in the sliding rack (55). The elastic buckle (62) is fixed to the end face of the sliding rack (55). The elastic pin (63) is fixed to the telescopic probe (61). The return spring (64) is disposed between the sliding rack (55) and the telescopic probe (61).

2. The surface paint spraying device for an automobile sheet metal part according to claim 1, characterized by: The spring-loaded assembly (3) includes an arc-shaped sleeve (31), an arc-shaped slide bar (32), and a return spring (33). The spring-loaded assembly (3) is located between adjacent sections of the circumferential pitch assembly (1). The arc-shaped sleeve (31) and the arc-shaped slide bar (32) are respectively located on two adjacent sections. The return spring (33) is located in the arc-shaped sleeve (31). Under the elastic force of the return spring (33), the arc-shaped slide bar (32) tends to retract into the arc-shaped sleeve (31).

3. The surface paint spraying device for an automobile sheet metal part according to claim 2, characterized by: The sliding assembly (7) also includes a slide plate (71) and a slider (73). The cantilever bracket (72) is located on the slide plate (71), and the slider (73) is located below the slide plate (71). The sliding assembly (7) is driven by an external linear module. The nozzle (8) is fixed to the fixed section (11), the intermediate section (12), and the end section (13).

4. The surface paint spraying device for an automobile sheet metal part according to claim 3, characterized by: The torsion guide wheel (21) and the transmission belt (22) are configured as toothed synchronous pulleys and belts.

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