Multi-station precise spraying system

By designing the conveying and positioning components of the multi-station precision spraying system, automatic flipping and spraying of the sheet material was achieved, solving the problem that existing equipment could not automatically flip the sheet material, improving spraying efficiency and consistency, and reducing labor intensity.

CN224237195UActive Publication Date: 2026-05-15SHENZHEN LINGTUO IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN LINGTUO IND CO LTD
Filing Date
2025-06-03
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing spraying equipment cannot automatically flip and spray the boards, resulting in high labor intensity, low efficiency, and easy scratches on the board surface.

Method used

A multi-station precision spraying system was designed, including a fixed frame, a conveying component, and a positioning component. The conveying component realizes automatic flipping and cyclic conveying of the sheet material through a linkage structure of a ring track, an L-shaped plate, and a motor drive. The positioning component realizes precise positioning and clamping of sheet materials of different sizes through a side plate, an alignment plate, and a screw structure.

Benefits of technology

It enables automatic flipping and spraying of panels, improving the automation level and spraying efficiency of the equipment, reducing labor intensity and error rate, and ensuring the continuity and consistency of the spraying process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of spraying, in particular to a multi-station precise spraying system which comprises a fixing frame, a paint spraying gun is installed on the top of the fixing frame, and a conveying assembly used for automatically overturning and conveying a plurality of plates to the bottom of the paint spraying gun to be sprayed is arranged on one side of the fixing frame. The conveying assembly is arranged, the rotating wheel is driven by the motor to drive the connecting plates, the L-shaped plate stably operates along the annular rail, meanwhile, when the L-shaped plate drives the linkage plate and the sliding column to move into the V-shaped groove, the rotating wheel is driven by the motor to drive the connecting plates to rotate, and the rotating wheel is driven by the motor to drive the connecting plates to rotate. And under the matching action of the V-shaped groove and the convex block, the linkage plate drives the connecting shaft and the plate borne by the linkage plate to automatically turn over, multi-station continuous spraying can be achieved through the structure, plate damage or misoperation caused by manual turning over is avoided, and the automation degree of equipment operation and the spraying efficiency are remarkably improved.
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Description

Technical Field

[0001] This utility model relates to the field of spraying technology, and in particular to a multi-station precision spraying system. Background Technology

[0002] In many fields such as furniture manufacturing, building decoration and industrial product surface treatment, spraying technology has been widely used as an important link to improve the appearance quality, anti-corrosion performance and service life of products. In order to improve the quality and efficiency of spraying, the spraying process is gradually shifting from traditional manual operation to automated, multi-station precision spraying. Especially when multiple boards are processed in continuous batches, the level of automation of the spraying system directly affects the production efficiency and processing consistency.

[0003] In the prior art, such as the "Multi-station Spraying Device" with announcement number CN222152517U, a base is included, a worktable is fixedly installed on the top surface of the base, and a spraying mechanism and a clamping mechanism are installed on the top surface of the worktable. Although this technology uses the spraying mechanism to apply color back and forth to the material to be sprayed, and the first hydraulic rod drives the first support frame to move to spray the material at different positions; and uses the clamping mechanism to quickly fix the material for multiple material spraying operations, and simultaneously starts the spraying device to spray the material, thus facilitating better material fixation, this technology is consistent with the traditional method in that existing spraying equipment mainly relies on manual operation when spraying boards, especially in the flipping process. When multiple sides of the board need to be sprayed, it is usually necessary to manually move the board to the spraying station one by one and flip it between different sides. This is not only labor-intensive and inefficient, but also easily causes scratches on the surface of the board. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a multi-station precision spraying system to solve the problem that existing spraying equipment cannot automatically flip and spray the board.

[0005] To achieve the above objectives, this utility model provides a multi-station precision spraying system, including a fixed frame. A paint gun is mounted on the top of the fixed frame, and a conveying component is provided on one side of the fixed frame for automatically flipping and conveying multiple plates to the bottom of the paint gun for spraying. The conveying component includes an annular track corresponding to the fixed frame, an annular block at the bottom of the annular track, and three L-shaped plates slidably connected between the annular track and the annular block. A plate is placed on one side of each L-shaped plate, and a positioning component is provided on one side of each L-shaped plate for fixing the position of the plate.

[0006] Preferably, the bottom of the annular block is fixedly connected to a plurality of second support frames, and the inner side of the annular track is fixedly connected to a plurality of first support frames.

[0007] Preferably, a movable groove is provided between the bottom of the annular track and the top of the annular block, a convex block is fixedly connected to the bottom of the annular track, and a V-shaped groove is provided on the top of the annular block. The V-shaped groove and the convex block are positioned corresponding to each other, and the positions of the V-shaped groove and the convex block are located in the path of the movable groove.

[0008] Preferably, a motor is installed on the inner side of the annular track on the ground. The motor is located in the middle of the inner diameter of the annular track. A wheel is fixedly connected to the top of the motor via a shaft. Three connecting plates are fixedly connected at equal intervals to the outside of the wheel, and the three connecting plates are at an angle to each other.

[0009] Preferably, the top of the annular track has an annular groove, and three pulleys are slidably connected inside the annular groove. An L-shaped plate is installed on the top of the pulleys, and one side of each of the three L-shaped plates is fixedly connected to the end of the three connecting plates away from the rotating wheel.

[0010] Preferably, a sliding column is slidably engaged inside the movable groove. A positioning ring is fixedly connected to one end of the sliding column, and a connecting plate is fixedly connected to the other end of the sliding column. A connecting shaft is fixedly connected to the end of the connecting plate away from the sliding column, and a side plate is fixedly connected to the end of the connecting shaft away from the connecting plate through the bottom of the L-shaped plate.

[0011] Preferably, when the sliding column slides inside the moving groove, the connecting plate and the L-shaped plate are in a perpendicular state, and the connecting plate and the side plate are in a parallel state. When the sliding column moves into the V-shaped groove, the connecting plate and the L-shaped plate are in a parallel state, and the side plate and the L-shaped plate are in a parallel state.

[0012] Preferably, the positioning component includes an alignment plate fixedly connected to one side of one end of the side plate, a baffle slidably connected to the other end of the side plate, a plate being engaged with the side of the alignment plate corresponding to the baffle, and the position of the paint gun output end corresponding to the position of the plate when the plate is rotated to one side of the fixing frame.

[0013] Preferably, a groove is provided inside the side plate at the end away from the alignment plate, a screw is rotatably connected inside the groove, a slider is threadedly connected to the outside of the screw, and one end of the slider is fixedly connected to one end of the baffle.

[0014] Preferably, a handle is fixedly connected to the end of the screw away from the inside of the groove and the end of the side plate. The screw is threaded on the outside of the handle end, and a nut is threaded on the outside of the screw at the threaded end of the handle. One side of the nut is in contact with one end of the side plate.

[0015] The beneficial effects of this utility model are:

[0016] 1. By setting up a conveyor assembly, including a ring track, ring block, L-shaped plate, and their linkage structure corresponding to the fixed frame, a stable and efficient conveyor assembly is constructed. This assembly enables the automatic flipping and cyclic conveying of multiple sheet materials. The motor-driven rotating wheel drives multiple connecting plates, allowing the L-shaped plate to run stably along the ring track. Simultaneously, when the L-shaped plate, along with the connecting plate and sliding column, moves into the V-groove, the connecting plate, along with the connecting shaft and the sheet material it carries, automatically flips under the action of the V-groove and the convex block. This structure enables continuous multi-station spraying while avoiding damage or misoperation of the sheet materials caused by manual flipping. It significantly improves the automation level and spraying efficiency of the equipment, effectively reduces labor intensity and error rate, and ensures the continuity and consistency of the spraying process.

[0017] 2. By setting a positioning component, a precise and adjustable positioning component is constructed by setting a side plate on the side of the L-shaped plate and integrating an alignment plate, sliding baffle, slide groove, screw, slider and locking structure on it. This component can not only effectively limit and clamp the plates of different sizes, but also achieve rapid clamping through the cooperation of screw and slider, ensuring the stability of the plate position during the conveying and spraying process and preventing shaking, displacement or tipping. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the conveying component and the positioning component of this utility model;

[0021] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the middle section;

[0022] Figure 4 This is an enlarged schematic diagram of the connecting plate and sliding column of this utility model;

[0023] Figure 5 This utility model Figure 4 Enlarged schematic diagram of the middle section;

[0024] Figure 6This is an enlarged schematic diagram of the annular block and annular track of this utility model.

[0025] The diagram is marked as follows:

[0026] 1. Fixed frame; 2. Spray gun; 3. First support frame; 4. Circular track; 5. Circular groove; 6. Second support frame; 7. Circular block; 8. V-groove; 9. Convex block; 10. Moving groove; 11. Motor; 12. Rotary wheel; 13. Connecting plate; 14. Pulley; 15. L-shaped plate; 16. Connecting shaft; 17. Sliding column; 18. Positioning ring; 19. Linkage plate; 20. Side plate; 21. Alignment plate; 22. Baffle; 23. Sliding groove; 24. Sliding block; 25. Screw; 26. Nut; 27. Handle; 28. Sheet metal. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Such as this utility model Figures 1 to 6 The diagram shows a multi-station precision spraying system, including a fixed frame 1, a paint gun 2 mounted on the top of the fixed frame 1, and a conveying assembly on one side of the fixed frame 1 for automatically flipping and conveying multiple plates 28 to the bottom of the paint gun 2 for spraying. The conveying assembly includes an annular track 4 corresponding to the fixed frame 1, an annular block 7 at the bottom of the annular track 4, and three L-shaped plates 15 slidably connected between the annular track 4 and the annular block 7. Plates 28 are placed on one side of the L-shaped plates 15, and a positioning assembly is provided on one side of the L-shaped plates 15 for fixing the position of the plates 28.

[0030] By setting up a conveying component, including an annular track 4, annular block 7, L-shaped plate 15, and their linkage structure corresponding to the fixed frame 1, a stable and efficient conveying component is constructed, realizing the automatic flipping and cyclic conveying of multiple plates 28. The motor 11 drives the rotating wheel 12 to drive multiple connecting plates 13, so that the L-shaped plate 15 runs stably along the annular track 4. At the same time, when the L-shaped plate 15 moves into the V-groove 8 with the connecting plate 19 and the sliding column 17, the connecting plate 19 with the connecting shaft 16 and the plate 28 it carries automatically flips under the action of the V-groove 8 and the convex block 9. This structure can realize continuous spraying at multiple stations, and avoid damage or misoperation of the plate 28 caused by manual flipping. It significantly improves the automation level and spraying efficiency of the equipment operation, effectively reduces labor intensity and error rate, and ensures the continuity and consistency of the spraying process.

[0031] like Figure 1 As shown, multiple second support frames 6 are fixedly connected to the bottom of the annular block 7, and multiple first support frames 3 are fixedly connected to the inner side of the annular track 4.

[0032] The first support frame 3 and the second support frame 6 are used to support the annular block 7 and the annular track 4, thereby forming a track moving groove 10 between the annular block 7 and the annular track 4, which facilitates the sliding of the sliding column 17 inside the moving groove 10.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, a moving groove 10 is provided between the bottom of the annular track 4 and the top of the annular block 7. A convex block 9 is fixedly connected to the bottom of the annular track 4. A V-shaped groove 8 is provided on the top of the annular block 7. The V-shaped groove 8 and the convex block 9 are positioned corresponding to each other, and the positions of the V-shaped groove 8 and the convex block 9 are located in the path of the moving groove 10.

[0034] By setting the V-shaped groove 8 and the convex block 9, a V-shaped track is formed on the path of the moving groove 10, which makes it easier for the rear sliding column 17 to slide between the V-shaped groove 8 and the convex block 9, thereby driving the connecting plate 19 and the side plate 20 to flip, which makes it easier to flip the plate 28 for use.

[0035] like Figures 1 to 6 As shown, a motor 11 is installed on the ground inside the circular track 4. The motor 11 is located in the middle of the inner diameter of the circular track 4. A rotating wheel 12 is fixedly connected to the top of the motor 11 via a shaft. Three connecting plates 13 are fixedly connected at equal intervals to the outside of the rotating wheel 12, and the three connecting plates 13 are at a 90-degree angle to each other.

[0036] With the motor 11 and three connecting plates 13 configured, during use, such as Figure 1As shown, this is the initial working state. During use, the paint gun 2 first sprays the material 28 already at the bottom of the gun. After spraying, the motor 11 is started, causing the rotating wheel 12 to rotate along with the connecting plate 13. At this time, the pulley 14 slides inside the annular groove 5, moving the L-shaped plate 15 along with it. The sliding column 17 slides inside the moving groove 10, moving the material 28 via the connecting plate 19. Then, when the first sprayed material 28 moves to one side between the V-shaped groove 8 and the convex block 9, the sliding column 17 first moves to the V-shaped groove 8. Between the V-groove 8 and the convex block 9, since the pulley 14 and the sliding column 17 move synchronously, the sliding column 17 first enters the space between the V-groove 8 and the convex block 9. The connecting plate 19 will then rotate the side plate 20 via the connecting shaft 16. At this point, the connecting plate 19 and the side plate 20 rotate the plate 28 until it is parallel to the L-shaped plate 15. Then, when the next plate 28 is finished being painted, the motor 11 starts and drives the connecting plate 13 to rotate again. At this point, the sliding column 17 on one side of the first plate 28 will move out of the space between the V-groove 8 and the convex block 9. When the sliding column 17 moves out of the space between the V-groove 8 and the convex block 9, the connecting plate 19... Plate 19 will rotate along with side plate 20 via connecting shaft 16, at which point the bottom surface of plate 28 will face upwards. Plates 28 are then sequentially conveyed and flipped to the bottom of spray gun 2, ensuring both sides of plate 28 are fully coated with material, thus avoiding the inconvenience of manual flipping as in traditional methods. After all three plates 28 have been coated on both sides, motor 11 is activated, causing wheel 12 to rotate in the opposite direction along with the three connecting plates 13. Since the sliding column 17 is positioned in front of the moving pulley 14 before the first flip, the plate 28 is flipped. After the flip, the sliding column 17... The column 17 will be behind the pulley 14, thus preventing it from completing the next flip. At this time, the motor 11 is started to rotate the three connecting plates 13 in the opposite direction, causing the L-shaped plate 15 to carry the column 17 through the V-shaped groove 8 and the convex block 9, and then pull the column 17 back to its original position. This makes it easier to restart the motor 11 to flip the plate 28 in the forward direction next time. It should be noted that the paint gun 2 is existing technology and can be adjusted in actual use, such as moving left and right, up and down, or forward and backward, so as to facilitate the spraying of plates 28 of different specifications.

[0037] like Figure 2 , Figure 3 ,and Figure 4 As shown, an annular groove 5 is provided at the top of the annular track 4. Three pulleys 14 are slidably connected inside the annular groove 5. An L-shaped plate 15 is installed on the top of the pulleys 14. One side of the three L-shaped plates 15 is fixedly connected to the end of the three connecting plates 13 away from the rotating wheel 12.

[0038] With the pulley 14 and L-shaped plate 15, the pulley 14 facilitates the rotation of the L-shaped plate 15, while the L-shaped plate 15 limits the position of the side plate 20, so that the side plate 20 can be in a parallel state with the connecting plate 19.

[0039] like Figure 2 , Figure 3 ,and Figure 4 As shown, a sliding column 17 is slidably engaged inside the moving groove 10. One end of the sliding column 17 is fixedly connected to a positioning ring 18, and the other end of the sliding column 17 is fixedly connected to a connecting plate 19. The end of the connecting plate 19 away from the sliding column 17 is fixedly connected to a connecting shaft 16. The end of the connecting shaft 16 away from the connecting plate 19 passes through the bottom of the L-shaped plate 15 and is fixedly connected to a side plate 20. When the sliding column 17 slides inside the moving groove 10, the connecting plate 19 and the L-shaped plate 15 are perpendicular to each other, and the connecting plate 19 and the side plate 20 are parallel to each other. When the sliding column 17 moves into the V-shaped groove 8, the connecting plate 19 and the L-shaped plate 15 are parallel to each other, and the side plate 20 and the L-shaped plate 15 are parallel to each other.

[0040] By using the sliding column 17 and the connecting plate 19, when the sliding column 17 moves between the V-groove 8 and the convex block 9, a movement difference is generated between the sliding column 17 and the pulley 14, which facilitates the automatic flipping of the plate 28. At the same time, the positioning ring 18 prevents the sliding column 17 from sliding out of the moving groove 10.

[0041] like Figure 4 and Figure 5 As shown, the positioning assembly includes an alignment plate 21 fixedly connected to one side of the side plate 20, a baffle 22 slidably connected to the other end of the side plate 20, a plate 28 being snapped onto the side of the alignment plate 21 corresponding to the baffle 22, and when the plate 28 is rotated to one side of the fixing frame 1, the position of the output end of the paint gun 2 corresponds to the position of the plate 28, a groove 23 is provided inside the side plate 20 away from the alignment plate 21, a screw 25 is rotatably connected inside the groove 23, a slider 24 is threadedly connected to the outside of the screw 25, and one end of the slider 24 is fixedly connected to one end of the baffle 22;

[0042] By setting a positioning component, a precise and adjustable positioning component is constructed by setting a side plate 20 on the side of the L-shaped plate 15, and integrating an alignment plate 21, a sliding baffle 22, a slide groove 23, a screw 25, a slider 24 and a locking structure on it. This component can not only effectively limit and clamp the plates 28 of different sizes, but also achieve rapid clamping through the cooperation of the screw 25 and the slider 24, ensuring the stability of the plate 28 in position during the conveying and spraying process, and preventing shaking, displacement or tipping.

[0043] like Figure 4 and Figure 5As shown, the end of the screw 25 away from the interior of the slide groove 23 passes through the end of the side plate 20 and is fixedly connected to a handle 27. The screw 25 is threaded on the outside of the handle 27, and a nut 26 is threaded on the outside of the threaded end of the screw 25. One side of the nut 26 is in contact with one end of the side plate 20.

[0044] When fixing the plate 28 using the nut 26, the plate 28 is first placed parallel to one side of the side plate 20. At this time, one end of the plate 28 is in contact with one side of the alignment plate 21. Then, by rotating the handle 27, the screw 25 is moved along with the slider 24 using the thread. During the movement, the baffle 22 is also moved, causing the baffle 22 to contact one end of the plate 28. This clamps the plate 28 between the alignment plate 21 and the baffle 22. At the same time, by rotating the nut 26, the nut 26 is made to contact one side of the side plate 20, so that the nut 26 can fix the position of the screw 25, prevent the screw 25 from rotating on its own, and increase the stability of the plate 28 being clamped.

[0045] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0046] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-station precision spraying system, comprising a mounting frame (1), wherein a paint gun (2) is mounted on the top of the mounting frame (1), characterized in that, The fixed frame (1) is provided with a conveying component on one side for automatically flipping and conveying multiple plates (28) to the bottom of the spray gun (2) for spraying. The conveying component includes an annular track (4) corresponding to the fixed frame (1). An annular block (7) is provided at the bottom of the annular track (4). Three L-shaped plates (15) are slidably connected between the annular track (4) and the annular block (7). Plates (28) are placed on one side of the L-shaped plate (15). A positioning component is provided on one side of the L-shaped plate (15), which is used to fix the position of the plate (28).

2. The multi-station precision spraying system according to claim 1, characterized in that, The bottom of the annular block (7) is fixedly connected to a plurality of second support frames (6), and the inner side of the annular track (4) is fixedly connected to a plurality of first support frames (3).

3. The multi-station precision spraying system according to claim 2, characterized in that, A movable groove (10) is provided between the bottom of the annular track (4) and the top of the annular block (7). A convex block (9) is fixedly connected to the bottom of the annular track (4). A V-shaped groove (8) is provided on the top of the annular block (7). The V-shaped groove (8) and the convex block (9) are positioned opposite each other, and the positions of the V-shaped groove (8) and the convex block (9) are located in the path of the movable groove (10).

4. The multi-station precision spraying system according to claim 3, characterized in that, A motor (11) is installed on the ground inside the circular track (4). The motor (11) is located in the middle of the inner diameter of the circular track (4). A rotating wheel (12) is fixedly connected to the top of the motor (11) through a shaft. Three connecting plates (13) are fixedly connected at equal intervals to the outside of the rotating wheel (12), and the three connecting plates (13) are at a 90-degree angle to each other.

5. A multi-station precision spraying system according to claim 4, characterized in that, The top of the annular track (4) is provided with an annular groove (5), and three pulleys (14) are slidably connected inside the annular groove (5). An L-shaped plate (15) is installed on the top of the pulley (14), and one side of the three L-shaped plates (15) is fixedly connected to the end of the three connecting plates (13) away from the rotating wheel (12).

6. A multi-station precision spraying system according to claim 5, characterized in that, The sliding groove (10) is internally slidably engaged with a sliding column (17). One end of the sliding column (17) is fixedly connected to a positioning ring (18), and the other end of the sliding column (17) is fixedly connected to a connecting plate (19). The end of the connecting plate (19) away from the sliding column (17) is fixedly connected to a connecting shaft (16), and the end of the connecting shaft (16) away from the connecting plate (19) passes through the bottom of the L-shaped plate (15) and is fixedly connected to a side plate (20).

7. A multi-station precision spraying system according to claim 6, characterized in that, When the sliding column (17) slides inside the moving groove (10), the connecting plate (19) and the L-shaped plate (15) are in a perpendicular state, and the connecting plate (19) and the side plate (20) are in a parallel state. When the sliding column (17) moves to the inside of the V-shaped groove (8), the connecting plate (19) and the L-shaped plate (15) are in a parallel state, and the side plate (20) and the L-shaped plate (15) are in a parallel state.

8. The multi-station precision spraying system according to claim 1, characterized in that, The positioning component includes an alignment plate (21) fixedly connected to one side of the side plate (20), and a baffle (22) slidably connected to the other end of the side plate (20). A plate (28) is snapped onto the side of the alignment plate (21) corresponding to the baffle (22). When the plate (28) is rotated to one side of the fixing frame (1), the position of the output end of the paint gun (2) corresponds to the position of the plate (28).

9. A multi-station precision spraying system according to claim 8, characterized in that, The side plate (20) has a groove (23) inside the end away from the alignment plate (21). A screw (25) is rotatably connected inside the groove (23). A slider (24) is threadedly connected to the outside of the screw (25). One end of the slider (24) is fixedly connected to one end of the baffle (22).

10. A multi-station precision spraying system according to claim 9, characterized in that, The end of the screw (25) away from the interior of the slide groove (23) is fixedly connected to the end of the side plate (20) and a handle (27). The screw (25) is threaded on the outside of the handle (27), and a nut (26) is threaded on the outside of the threaded end of the screw (25) and the nut (26) is in contact with one end of the side plate (20).