A paint spraying device for bicycle production

Abstract

The application belongs to the field of mechanical manufacturing and automation technology, and discloses a paint spraying device for bicycle production, which comprises a frame serving as a protective structure during the paint spraying process of the bicycle production, a spraying pipe vertically and slidingly connected to the top end of the frame and used for changing the spraying position, a feeding pipe threadedly connected to the feeding end of the spraying pipe and used for feeding the spraying pipe, and a lifting structure fixedly installed at the top end of the frame and fixedly connected between the movable end and the bottom end of the outer surface of the spraying pipe, used for adjusting the depth of the spraying pipe in the frame, wherein the lifting structure is provided with a dispersing disc driven by a driving member and adjustable-spacing fixing strips and moving strips, the application constructs a dynamic spraying area adaptable to different frame widths, the circumferential blocking structure ensures that the paint is strictly limited to be sprayed in the target area, completely eliminates the invalid spraying on the blank area between the frames, completely eliminates the over-spraying phenomenon from the source, and significantly reduces the production cost.

Description

Technical Field

[0001] This invention belongs to the field of mechanical manufacturing and automation technology, and particularly relates to a painting device for bicycle production. Background Technology

[0002] As a popular green mode of transportation and sports equipment, the appearance quality of bicycles is increasingly becoming a focus of consumers' attention. As a key process that determines the appearance, rust resistance and durability of bicycles, the level of automation and intelligence of the painting process is directly related to production efficiency and product quality.

[0003] Currently, large bicycle manufacturers generally use automated painting production lines, which typically consist of a conveyor chain system, a pretreatment station, a spraying system (such as a spraying mechanism or a spraying robot), and a curing oven. In the pretreatment paint (such as primer) coating stage, a through-type spraying system is often used.

[0004] In this process, in order to achieve full coverage of the vehicle frame surface, a circumferentially arranged spray structure is usually adopted. At the same time, a certain distance must be maintained between the vehicle frames on the conveyor chain to ensure that the vehicle frames can rotate smoothly when entering the spray area.

[0005] However, existing spraying systems have significant drawbacks: their spraying operation is continuous and cannot automatically identify the frame body and the gap area, resulting in a large amount of paint being continuously sprayed into the gaps between the frames, causing serious waste of paint resources. Summary of the Invention

[0006] This invention addresses the problem in existing technologies where the painting process is continuous and cannot automatically identify the vehicle frame body and intervening areas, resulting in a large amount of paint being continuously sprayed into the gaps between the frames, causing serious waste of paint resources. The invention proposes the following technical solution:

[0007] A painting apparatus for bicycle manufacturing includes: a frame, serving as a protective structure during the painting process in bicycle manufacturing;

[0008] The spray pipe is vertically slidably connected to the top of the frame to change the spray position;

[0009] The feed pipe is threadedly connected to the feed end of the spray pipe to supply material to the spray pipe;

[0010] The lifting structure is fixedly installed at the top of the frame and its movable end is fixedly connected to the bottom of the outer surface of the spray pipe, so as to adjust the depth of the spray pipe inside the frame.

[0011] The multi-faceted barrier mechanism includes: a driving component, a dispersion disc, a fixing strip, a moving strip, a circumferential barrier structure, a recycling structure, and an adjustment structure;

[0012] A driving component is fixedly installed at the bottom end of the spray pipe and is coaxial with the spray pipe;

[0013] The distribution disk is snapped into the output end of the drive unit;

[0014] The fixing strip is fixedly installed on the outer surface of the dispersing disc;

[0015] The movable strip is movably connected to the outer surface of the fixed strip;

[0016] A circumferential barrier structure is connected between the fixed strip and the moving strip to block the paint flowing between the fixed strip and the moving strip, so that the paint enters the interior of the dispersion disc.

[0017] The recycling structure is rotatably connected to the outside of the dispersion disk and fixedly connected to the bottom of the outer surface of the spray pipe, supporting the dispersion disk while collecting the diverted paint.

[0018] An adjustment structure is located inside the dispersion disk to adjust the distance between the fixed strip and the moving strip.

[0019] As a preferred embodiment of the above technical solution, the circumferential barrier structure includes a guide rod, which is fixedly installed at the bottom end of the fixed strip. A triangular arc-shaped strip is sleeved on the outside of the fixed strip, and an arc-shaped spring is sleeved on the outside of the triangular arc-shaped strip, with one end of the arc-shaped spring and the inner wall of the triangular arc-shaped strip fitting together. A support rod is sleeved on the other side inside the triangular arc-shaped strip, and the end face of the support rod away from the fixed strip is fixedly connected to the moving strip.

[0020] As a preferred embodiment of the above technical solution, the bottom end face of the triangular arc strip is provided with three rectangular grooves, the guide rod and the support rod are both T-shaped, the bottom ends of the fixed strip and the moving strip are provided with matching grooves, and the triangular arc strip is located inside the matching grooves.

[0021] As a preferred embodiment of the above technical solution, a baffle is integrally formed on the inclined surface of the triangular arc-shaped strip corresponding to the bottom end of the fixed strip and the moving strip, and the bottom end of the baffle and the inclined surface of the triangular arc-shaped strip are in contact with each other.

[0022] As a preferred embodiment of the above technical solution, the recycling structure includes a return pipe, which is fixedly installed on the outer surface of the spray pipe. A rotating disk is fixedly installed at the bottom end of the spray pipe, and a filter is installed in the middle of the bottom end of the rotating disk.

[0023] As a preferred embodiment of the above technical solution, a conical ring is integrally formed at the top center of the rotating disk, and the outlet end of the return pipe passes through the conical ring.

[0024] As a preferred embodiment of the above technical solution, the adjustment structure includes a connecting rod, which is fixedly connected to the moving bar, and a rotating ring is snapped onto the end of the connecting rod away from the moving bar.

[0025] As a preferred embodiment of the above technical solution, the inner wall of the rotating ring is connected to a gear by a key, a metal sheet is fitted inside the gear, a T-shaped rod is fixedly installed at one end of the metal sheet, and a common mounting base is installed between multiple T-shaped rods, with the top of the mounting base and the bottom of the inner outer surface of the dispersing disk being fixedly connected.

[0026] As a preferred embodiment of the above technical solution, the outer side of the dispersion disc is provided with equidistant return holes, the fixed strip and the moving strip are symmetrically arranged on the outer side of the dispersion disc with respect to the center line of the return holes, the spray pipe is provided with an annular groove, and the inner and outer sides of the fixed strip, the moving strip and the triangular arc strip are respectively attached to the inner wall and the outer wall of the annular groove.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) By using a dispersion disc driven by a drive unit and fixed and moving strips with adjustable spacing, the present invention constructs a dynamic spraying area that can adapt to different frame widths. The circumferential barrier structure ensures that the paint is strictly limited to the target area for spraying, completely eliminating the ineffective spraying of the blank areas between the frames, preventing overspraying from the source, and significantly reducing production costs.

[0029] (2) By adjusting the structure to change the distance between the fixed strip and the moving strip, it can quickly adapt to bicycle frames of different models and widths without replacing the entire spraying mechanism, greatly shortening the changeover time and improving the flexibility and efficiency of the production line. It is especially suitable for modern production modes with multiple varieties and small batches.

[0030] (3) The spacing between the moving strip and the fixed strip can be changed by the circumferential barrier structure, and after the change, there is no space between the two, thus forming a dynamic sealing effect, which further facilitates the return of the coating. Attached Figure Description

[0031] Figure 1 The diagram shown is a structural schematic of a painting apparatus for bicycle production according to Embodiment 1;

[0032] Figure 2 The image shown is a front view of a bicycle manufacturing spray painting apparatus according to Embodiment 1;

[0033] Figure 3 The diagram shown is a cross-sectional view of the spray pipe in Example 1;

[0034] Figure 4 The diagram shown is a schematic of the installation structure of the dispersion disk in Example 1;

[0035] Figure 5 The diagram shown is a schematic representation of the recycling structure in Example 1;

[0036] Figure 6 The diagram shown is a schematic of the installation structure of the movable bar in Embodiment 1;

[0037] Figure 7 The diagram shown is a schematic diagram of the circumferential barrier structure in Embodiment 1;

[0038] Figure 8 The diagram shown is a schematic diagram of the adjustment structure in Embodiment 1;

[0039] Figure 9 The example shown is from embodiment 1. Figure 8 A schematic diagram of the structure of region A in the middle.

[0040] In the diagram: 1. Frame; 2. Spray pipe; 3. Feed pipe; 4. Lifting structure; 51. Drive component; 52. Dispersion disc; 53. Return hole; 54. Fixing bar; 55. Moving bar; 56. Circumferential barrier structure; 561. Guide rod; 562. Triangular arc bar; 563. Arc spring; 564. Support rod; 565. Rectangular groove; 57. Recycling structure; 571. Return pipe; 572. Rotary disc; 573. Filter; 58. Adjustment structure; 581. Connecting rod; 582. Rotating ring; 583. Gear; 584. Metal sheet; 585. T-shaped rod; 586. Mounting base; 6. Fitting groove; 7. Conveyor chain structure. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Example

[0042] This invention provides a painting apparatus for bicycle production, such as... Figures 1 to 9As shown, the system includes: a frame 1, a spray pipe 2, a feed pipe 3, a lifting structure 4, and a multi-faceted barrier mechanism. The frame 1 serves as a protective structure during the painting process in bicycle production. The spray pipe 2 is vertically slidably connected to the top of the frame 1 to change the spraying position. The feed pipe 3 is threadedly connected to the feed end of the spray pipe 2 to supply material to the spray pipe 2. The lifting structure 4 (specifically a lifting cylinder) is fixedly installed on the top of the frame 1, with its movable end fixedly connected to the bottom of the outer surface of the spray pipe 2. The cylinder body of the lifting structure 4 is fixed to the top of the frame 1, and the top of the piston rod is fixedly connected to the spray pipe 2 to adjust the depth of the spray pipe 2 inside the frame 1. A conveyor chain structure 7 is installed at the bottom of the frame 1 outside the spray pipe 2. The multi-faceted barrier mechanism includes: a drive component 51, a dispersing disc 52, a fixing strip 54, a moving strip 55, a circumferential barrier structure 56, a recovery structure 57, and an adjustment mechanism. The spray pipe 2 is divided into several sections: section structure 58; drive component 51 (specifically a waterproof servo motor, whose output shaft is connected to the dispersing disc 52 via a key) is fixedly installed at the bottom end of the spray pipe 2 and coaxial with the spray pipe 2; dispersing disc 52 is snapped into the output end of drive component 51; fixing strip 54 is fixedly installed on the outside of dispersing disc 52; moving strip 55 is movably connected to the outside of fixing strip 54; circumferential barrier structure 56 is connected between fixing strip 54 and moving strip 55 to block the paint flowing between fixing strip 54 and moving strip 55, allowing the paint to enter the interior of dispersing disc 52; recovery structure 57 is rotatably connected to the outside of dispersing disc 52 and fixedly connected to the bottom end of the outer surface of spray pipe 2, supporting dispersing disc 52 while collecting the flowing paint; adjustment structure 58 is located inside dispersing disc 52 to adjust the distance between fixing strip 54 and moving strip 55.

[0043] The existing spraying system has significant drawbacks: its spraying operation is continuous and it cannot automatically identify the frame body and the interval area, resulting in a large amount of paint being continuously sprayed into the gaps between the frames, causing serious waste of paint resources;

[0044] In this invention, a dynamic spraying area that can adapt to different frame widths is formed by the dispersion disc 52 driven by the drive component 51 and the fixed strip 54 and moving strip 55 with adjustable spacing. The circumferential barrier structure 56 ensures that the paint is strictly limited to spraying within the target area. Compared with the continuous full-range spraying of traditional equipment, this invention eliminates the ineffective spraying of blank areas between frames, eliminates overspraying from the source, and significantly reduces production costs.

[0045] In use, the frame is transported to the inside of the frame 1 and located outside the spray pipe 2 through the conveyor chain structure 7. At this time, the paint from the outside enters the inside of the spray pipe 2 along the feed pipe 3 and is sprayed onto the frame transported by the conveyor chain structure 7. At the same time, the lifting structure 4 (specifically a lifting cylinder) operates. When the lifting structure 4 operates, it drives the spray pipe 2 to rise. When the spray pipe 2 rises, it sprays different positions on the outside of the frame.

[0046] During the spraying process, some of the paint enters above the circumferential barrier structure 56 along the space between the fixed strip 54 and the moving strip 55, and then enters the interior of the dispersion disk 52 along the circumferential barrier structure 56. It then enters the interior of the recovery structure 57. The paint that has not yet entered the space between the fixed strip 54 and the moving strip 55 enters the outside of the dispersion disk 52 and then flows along the dispersion disk 52 onto the frame. At the same time, the distance between the fixed strip 54 and the moving strip 55 is adjusted by the adjustment structure 58, so as to suit frames of different widths.

[0047] Furthermore, the moving strip 55 moves circumferentially along the dispersing disk 52, forming an angle between the moving strip 55, the fixed strip 54, and the center point of the dispersing disk 52, such that the area of ​​the paint diffused inside the angle is equal to or less than the distance between the two frames, thereby blocking the blank area between the two frames and preventing the paint from being sprayed between the two frames.

[0048] To achieve the goal of preventing the coating from entering the dispersion disk 52 as described in the above example, the following solution is proposed: Figure 4 and Figure 6As shown, the circumferential barrier structure 56 includes a guide rod 561, which is embedded in the bottom end of the fixed strip 54. A triangular arc-shaped strip 562 is sleeved on the outside of the fixed strip 54. An arc-shaped spring 563 is sleeved on the outside of the triangular arc-shaped strip 562, with one end of the arc-shaped spring 563 and the inner wall of the triangular arc-shaped strip 562 in contact with each other. A support rod 564 is sleeved on the other side inside the triangular arc-shaped strip 562. The end face of the support rod 564 away from the fixed strip 54 is embedded in the inside of the moving strip 55. A baffle is integrally formed on the inclined surface of the triangular arc-shaped strip 562 corresponding to the bottom end of the fixed strip 54 and the moving strip 55. The bottom end of the baffle and the inclined surface of the triangular arc-shaped strip 562 are in contact with each other. The bottom surface of the arc-shaped strip 562 has three rectangular grooves 565. The guide rod 561 and the support rod 564 are both T-shaped. The bottom ends of the fixed strip 54 and the moving strip 55 are both provided with fitting grooves 6. The triangular arc-shaped strip 562 is located inside the fitting grooves 6. The outer side of the dispersion disk 52 is provided with equidistant return holes 53. The number of return holes 53 is set to six. The number of fixed strips 54 and moving strips 55 is opposite to the number of return holes 53. The fixed strips 54 and moving strips 55 are symmetrically arranged on the outer side of the dispersion disk 52 with the center line of the return holes 53. The inside of the spray pipe 2 is provided with an annular groove. The inner and outer sides of the fixed strips 54, moving strips 55 and triangular arc-shaped strips 562 are respectively attached to the inner and outer walls of the annular groove.

[0049] Furthermore, the inclined surface of the triangular arc bar 562 matches the inclined angle of the baffle to ensure effective sealing and blocking under different adjustment positions. The arc spring 563 not only provides the restoring force, but also plays a role in buffering and stabilizing the movement of the triangular arc bar 562.

[0050] In use, the moving bar 55 is pulled. As the moving bar 55 moves, it moves inside the rectangular groove 565 of the triangular arc bar 562 via the support rod 564. When one end face of the support rod 564 is in contact with the inner wall of the triangular arc bar 562, the baffle of the moving bar 55 is at the edge of the inclined surface of the triangular arc bar 562. Then, the moving bar 55 is pulled again. At this time, the moving bar 55 drives the triangular arc bar 562 to move via the support rod 564, so that the triangular arc bar 562 moves along the outside of the guide rod 561 and compresses the arc spring 563, so that the arc spring 563 stores energy. When the triangular arc bar 562 moves to the maximum distance, the baffle at the bottom of the fixed bar 54 and the edge of the inclined surface of the triangular arc bar 562 are in contact with each other. At this time, the coating can be blocked, and then the coating enters the interior of the dispersion disc 52 along the return hole 53.

[0051] To achieve the goal of supporting the dispersion disc 52 without hindering its rotation, while simultaneously blocking the paint on the front of the spray pipe 2 to prevent paint from being directly sprayed onto personnel observing from outside the frame 1, the following solutions are proposed: Figure 4 and Figure 5 As shown, the recovery structure 57 includes a return pipe 571, which is fixedly installed on the outer surface of the spray pipe 2. A rotating disk 572 is fixedly installed at the bottom end of the spray pipe 2. The bottom end of the dispersion disk 52 and the rotating disk 572 are rotatably connected by a bearing. A threaded hole is opened in the middle of the bottom end of the rotating disk 572. A filter 573 (specifically, the filter 573 is a combination of a double-layer filter structure and a filter cover with air holes, the double-layer filter structure includes a primary filter and a high-efficiency precision filter) is installed inside the threaded hole. A conical ring is integrally formed in the middle of the top end of the rotating disk 572, and the air outlet end of the return pipe 571 passes through the conical ring.

[0052] In use, the conical ring facilitates the flow of gas, allowing it to enter the filter 573. The paint on the front of the spray pipe 2 enters the middle of the rotating disk 572 along the return pipe 571, and enters the filter 573 simultaneously with the paint collected inside the return hole 53. At this time, the filter 573 separates the solids and gases in the paint, achieving the purpose of paint recovery.

[0053] To achieve the synchronous adjustment of multiple moving bars 55 in the above example, change the adjustment time, and ensure that the moving bars 55 move at the same distance, the following solution is provided: The adjustment structure 58 includes a connecting rod 581, which is fixedly installed inside the moving bar 55. A rotating ring 582 is snapped onto the end of the connecting rod 581 away from the moving bar 55. A gear 583 is connected to the inner wall of the rotating ring 582 via a key. A metal plate 584 is fitted inside the gear 583. A T-shaped rod 585 is fixedly installed at one end of the metal plate 584. The same mounting base 586 is installed between multiple T-shaped rods 585. The top of the mounting base 586 is fixedly connected to the bottom of the inner outer surface of the dispersion disc 52.

[0054] Furthermore, the gear 583 and the metal plate 584 cooperate to form a damping structure, ensuring stability and self-locking function during the adjustment process, and preventing positional changes due to vibration or paint impact. The outer side of the rotating ring 582 can be provided with anti-slip texture or operating handle for easy manual adjustment. A support block is welded to the bottom of the rotating ring 582 to facilitate the rotation of the rotating ring 582.

[0055] In use, the operator rotates the rotating ring 582, which drives the gear 583 to rotate. When the gear 583 rotates, it first squeezes the metal sheet 584, causing the metal sheet 584 to deform. When the gear 583 rotates, the metal sheet 584 enters the other tooth of the gear 583. At this time, the deformation of the metal sheet 584 enters the tooth, thereby increasing the torque that the gear 583 needs to withstand during rotation. This causes the rotating ring 582 to rotate. When the rotating ring 582 rotates, it drives the connecting rod 581 to swing inside the return hole 53, thereby driving the moving bar 55 to rotate along the center of the dispersing disk 52.

[0056] Working principle: The bicycle frame to be painted is fixed on the conveyor chain structure 7. The operator presets the painting width according to the width of the current batch of frames by adjusting the structure 58 and manually rotates the moving bar 55. The moving bar 55 drives the rotating ring 582 to rotate through the connecting rod 581. At this time, the damping cooperation between the gear 583 and the metal plate 584 creates a gap to increase the resistance and keep it fixed. As the rotating ring 582 rotates, it synchronously drives all the moving bars 55 to move, thereby changing the distance between them and the fixed bar 54. This distance is adjusted to be slightly wider than the width of the frame, forming a dynamically adaptable spraying area (this method is adjusted before installation with the spray pipe 2).

[0057] Simultaneously, as the moving strip 55 moves, it moves within the rectangular groove 565 of the triangular arc strip 562 via the support rod 564. When one end face of the support rod 564 is in contact with the inner wall of the triangular arc strip 562, the baffle of the moving strip 55 is located at the edge of the inclined surface of the triangular arc strip 562. Then, the moving strip 55 continues to be pulled, and the moving strip 55 drives the triangular arc strip 562 to move via the support rod 564, causing the triangular arc strip 562 to move along the outside of the guide rod 561 and compress the arc spring 563, allowing the arc spring 563 to store energy. When the triangular arc strip 562 moves to the maximum distance, the baffle at the bottom of the fixed strip 54 and the edge of the inclined surface of the triangular arc strip 562 are in contact with each other. At this time, under the action of the spring, both inclined surfaces of the triangular arc strip 562 can always be tightly in contact with the baffles on the fixed strip 54 and the moving strip 55 at the same time, achieving dynamic sealing and preventing the paint from leaking from the bottom.

[0058] Next, the dispersing disc 52 and the driving component 51 are installed together. Then, the feeding pipe is connected to the feed pipe 3. The paint is pumped into the spray pipe 2. The conveyor chain structure 7 is started, which smoothly transports the frame into the frame 1 and corresponds to the fan-shaped spray area on the outside of the spray pipe 2 (adjusting the rotation speed of the driving component 51 and the running speed of the conveyor chain structure 7 to make them correspond is existing technology and will not be elaborated on here). At this time, the paint is sprayed downward from the spray pipe 2. At the same time, the driving component 51 is started, which drives the multi-faceted barrier mechanism composed of the dispersing disc 52, the fixed bar 54, the moving bar 55, etc. to rotate together. At this time, the paint inside the spray pipe 2 enters the outside of the dispersing disc 52 along the annular groove, and the paint is sprayed circumferentially along the outside of the dispersing disc 52.

[0059] At this time, some of the paint enters above the triangular arc-shaped strip 562 (changing the circumferential spraying on the outer side of the dispersion disc 52 to a fan-shaped area spraying) between the fixed strip 54 and the moving strip 55 (the included angle between the fixed strip 54 and the moving strip 55 is equal to or less than the distance between the two frames). Then, it enters the return hole 53 through the obstruction of the triangular arc-shaped strip 562, and enters the interior of the dispersion disc 52 through the return hole 53. The paint near the front of the spray pipe 2 enters the interior of the return pipe 571, and then enters the middle of the rotating disc 572 along the return pipe 571. It enters the filter 573 simultaneously with the paint collected inside the return hole 53. At this time, the solid and gas in the paint are separated by the filter 573, thus achieving the purpose of paint recovery.

[0060] Finally, while the conveyor chain structure 7 is moving the vehicle frame, the drive component 51 drives the dispersing disc 52 to rotate. At this time, the paint sprayed along the outside of the dispersing disc 52 is always aligned with the vehicle frame. Then, the lifting structure 4 (lifting cylinder) operates according to the preset program, driving the entire spray pipe 2 and the spraying device at its end to slowly rise or fall, thereby ensuring that every height position of the vehicle frame from bottom to top or from top to bottom can be evenly covered.

[0061] When the device needs maintenance or painting of frames of different widths after use, the worker supports the dispersion disc 52 to remove the filter 573. Then, while supporting the dispersion disc 52, the worker inserts their other hand into the dispersion disc 52 through the hole where the filter 573 is installed. The worker then rotates the rotating ring 582 by hand. As the rotating ring 582 rotates, it moves the moving strip 55 through the connecting rod 581. This achieves the purpose of adjusting the distance between the fixed strip 54 and the moving strip 55 (this adjustment is performed after installation with the spray pipe 2).

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A painting apparatus for bicycle production, characterized in that, Includes a frame (1), and a spray pipe (2) is slidably connected to the top of the frame (1); The multi-faceted barrier mechanism includes a dispersion disc (52), a fixed strip (54), a moving strip (55), a circumferential barrier structure (56), a recovery structure (57), and an adjustment structure (58). The circumferential barrier structure (56) is connected between the fixed strip (54) and the moving strip (55) to block the paint flowing between the fixed strip (54) and the moving strip (55), allowing the paint to enter the interior of the dispersion disc (52). The recovery structure (57) is rotatably connected to the dispersion disc (52). The outer side of the dispersion plate (52) and the bottom of the outer surface of the spray pipe (2) are fixedly connected to support the dispersion plate (52) and collect the diverted paint. The adjustment structure (58) is located inside the dispersion plate (52) to adjust the distance between the fixed strip (54) and the moving strip (55). The feed end of the spray pipe (2) is threadedly connected to the feed pipe (3). The top of the frame (1) is provided with a lifting structure (4) to adjust the depth of the spray pipe (2) inside the frame (1). The multi-faceted barrier mechanism also includes a driving component (51), which is fixedly installed at the bottom end of the spray pipe (2) and coaxial with the spray pipe (2). The dispersing disk (52) is snapped into the output end of the driving component (51). The fixing strip (54) is fixedly installed on the outer surface of the dispersing disk (52), and the moving strip (55) is movably connected to the outer surface of the dispersing disk (52). The circumferential barrier structure (56) includes a guide rod (561), which is fixedly installed at the bottom end of the fixing strip (54). A triangular arc strip (562) is sleeved on the outside of the fixing strip (54). An arc spring (563) is sleeved on the outside of the triangular arc strip (562), and one end of the arc spring (563) is in contact with the inner wall of the triangular arc strip (562). A support rod (564) is sleeved on the other side inside the triangular arc strip (562). The end face of the support rod (564) away from the fixing strip (54) is fixedly connected to the moving strip (55).

2. The painting apparatus for bicycle production according to claim 1, characterized in that, The bottom surface of the triangular arc strip (562) is provided with three rectangular grooves (565). The guide rod (561) and the support rod (564) are both T-shaped. The bottom ends of the fixed strip (54) and the moving strip (55) are provided with fitting grooves (6). The triangular arc strip (562) is located inside the fitting grooves (6).

3. The painting apparatus for bicycle production according to claim 2, characterized in that, The bottom ends of the fixed strip (54) and the movable strip (55) are integrally formed with baffles on the inclined surfaces of the triangular arc strip (562), and the bottom ends of the baffles and the inclined surfaces of the triangular arc strip (562) are in contact with each other.

4. The painting apparatus for bicycle production according to claim 1, characterized in that, The recycling structure (57) includes a return pipe (571), which is fixedly installed on the outer surface of the spray pipe (2). A rotating disk (572) is fixedly installed at the bottom end of the spray pipe (2), and a filter (573) is installed in the middle of the bottom end of the rotating disk (572).

5. A painting apparatus for bicycle production according to claim 4, characterized in that, The rotating disk (572) has a conical ring integrally formed at the top center, and the air outlet end of the return pipe (571) passes through the conical ring.

6. A painting apparatus for bicycle production according to claim 1, characterized in that, The adjustment structure (58) includes a connecting rod (581), which is fixedly connected to the moving bar (55). A rotating ring (582) is snapped onto one end of the connecting rod (581) away from the moving bar (55).

7. A painting apparatus for bicycle production according to claim 6, characterized in that, The inner wall of the rotating ring (582) is connected to a gear (583) by a key. A metal sheet (584) is fitted inside the gear (583). A T-shaped rod (585) is fixedly installed at one end of the metal sheet (584). A mounting base (586) is installed between multiple T-shaped rods (585). The top of the mounting base (586) is fixedly connected to the bottom of the inner outer surface of the dispersing disk (52).

8. A painting apparatus for bicycle production according to claim 1, characterized in that, The dispersion disc (52) has equidistant return holes (53) on its outer side. The fixed strip (54) and the moving strip (55) are symmetrically arranged on the outer side of the dispersion disc (52) with respect to the center line of the return holes (53). The spray pipe (2) has an annular groove inside. The fixed strip (54), the moving strip (55) and the triangular arc strip (562) are respectively attached to the inner wall and the outer wall of the annular groove.

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