An automatic paint spraying device

Abstract

The present application belongs to the field of automatic spraying technology of automotive interior parts, and particularly relates to an automatic paint spraying device, comprising a spraying conveying table, wherein a conveying mechanism is arranged on the spraying conveying table, and an angle-adjustable spraying mechanism is further arranged on the front side of the spraying conveying table. The conveying mechanism comprises a closed conveying assembly arranged on the spraying conveying table and used for batch conveying of interior plastic parts, wherein a supporting assembly for placing the interior plastic parts is arranged on the conveying assembly, and a lifting assembly is further arranged on the conveying assembly. A driving assembly is arranged on the upper side of the spraying conveying table and close to the front side, and the driving assembly cooperates with each supporting assembly to control the automatic rotation of the supporting assembly to accept spraying when the supporting assembly is close to the spraying assembly. The present application reduces paint waste, shortens spraying time, improves spraying quality, effectively reduces production cost, and reduces waste material generation and environmental pollution due to high utilization of paint.

Description

Technical Field

[0001] This invention belongs to the field of automatic paint spraying technology for automotive interior parts, and particularly relates to an automatic paint spraying device. Background Technology

[0002] After being molded by injection molding, vacuum forming, etc., automotive interior plastic parts usually need to undergo a series of post-processing processes (such as painting, drying, surface decoration, functional enhancement, etc.) to meet requirements for appearance, feel, durability, etc.

[0003] To improve the efficiency of paint spraying on automotive interior plastic parts, some interior parts can be sprayed automatically. After being fixed by a fixing device, the interior plastic parts are placed on a feeding mechanism. The feeding mechanism moves the interior parts while spraying paint through multiple nozzles along the path. During the spraying process, the interior plastic parts rotate continuously to ensure that the paint is applied thoroughly.

[0004] The above-mentioned automotive interior plastic parts have the following defects in the paint spraying process: 1) The spraying equipment is generally installed on one side of the feeding mechanism and tilted at a certain angle. In order to ensure the spraying effect, multiple nozzles with small spacing are usually provided on the conveying path of the feeding mechanism. The nozzles spray a range of paint to the passing interior plastic parts. However, in the actual spraying process, only a part of the paint will be applied to the interior plastic parts, and the other part of the paint will be scattered on the worktable, resulting in a large amount of paint waste.

[0005] 2) During the spraying process, since the nozzle is on one side of the interior plastic parts, each interior plastic part will rotate to ensure that each side surface of the interior plastic part can be sprayed. Each interior plastic part needs to rotate for a long time during the entire spraying process. The continuous rotation for a long time will cause the paint mist to be thrown off before it adheres. In order to avoid a thin coating or a strong grainy texture, the spraying time needs to be increased to eliminate the above effects, which further increases the waste of paint.

[0006] Therefore, there is an urgent need for an automatic paint spraying device to solve the problem of low paint utilization rate when spraying traditional interior plastic parts. Summary of the Invention

[0007] To address the aforementioned problems, the present invention provides an automatic paint spraying device, which solves the problems mentioned in the background art.

[0008] To achieve the above objectives, this application provides the following technical solution: The present invention provides an automatic paint spraying device, including a spraying conveyor table. A conveying mechanism is provided on the spraying conveyor table, and an angle-adjustable spraying mechanism is also provided on the front side of the spraying conveyor table. The conveying mechanism includes a closed transport component disposed on the spraying conveyor table for batch transport of interior plastic parts. A support component for placing the interior plastic parts is provided on the transport component. A lifting component is also provided on the transport component. A drive component is located on the upper side of the spraying conveyor table, near the front side. The drive component cooperates with each support component to control the support component to automatically rotate and receive spraying when it approaches the spraying component. The supporting component includes a connecting part connected to the transport component. The connecting part is slidably connected to the spraying conveyor. A rotating shaft is provided above the connecting part, and a toggle frame is provided on the rotating shaft. The toggle frame cooperates with the drive component to rotate. A support plate that is compatible with the interior plastic parts is fixedly connected to the upper end of the rotating shaft. A movable part for driving the support plate to rise and fall is provided between the lower end of the rotating shaft and the connecting part. The movable part moves with the transport component and is gradually raised by the lifting component in each different area of ​​the spraying conveyor.

[0009] According to an advantageous embodiment, the spraying conveyor includes a mounting frame fixedly installed on the ground. A spraying table is fixedly installed on the upper side of the mounting frame via multiple columns. The spraying table consists of an outer frame and an inner guide plate. Both the outer frame and the inner guide plate are fixedly connected to the mounting frame via corresponding columns. The inner sidewall of the outer frame and the outer sidewall of the inner guide plate together form a serpentine conveying channel that is closed at both ends.

[0010] According to an advantageous embodiment, the transport assembly includes a plurality of sprockets rotatably disposed between a mounting frame and a spraying table, a transport chain being sleeved together among the plurality of sprockets, a support assembly being connected to the transport chain, and a drive motor being fixedly mounted on the mounting frame, the output shaft of the drive motor being fixedly connected to one of the sprockets.

[0011] According to an advantageous embodiment, the connecting part includes a connecting seat 1 fixedly connected to the transport chain, a T-shaped connecting plate fixedly connected to the upper side of the connecting seat 1, a disc-shaped connecting seat 2 fixedly connected to the vertical section of the T-shaped connecting plate, and a plurality of guide balls 1 provided on the upper side of the horizontal section of the T-shaped connecting plate and the lower side of the connecting seat 2. The guide balls 1 are rotatably connected to the corresponding side wall of the spraying table, and the T-shaped connecting plate is slidably disposed in the conveying channel.

[0012] According to an advantageous embodiment, the actuating frame includes a rotating sleeve rotatably sleeved on the surface of a rotating shaft, and a plurality of actuating levers are fixedly disposed on the surface of the rotating sleeve along its circumferential direction.

[0013] According to an advantageous embodiment, the drive assembly includes a drive plate fixedly mounted on the upper side of the spraying table by two L-shaped fixing plates on the left and right, and a plurality of levers fixedly mounted on the front side of the drive plate along its length direction, and the lever rotatably engages with the plurality of levers.

[0014] According to an advantageous embodiment, the movable part includes a sliding column slidably inserted into the upper side of the connecting seat 2. The lower end of the sliding column slidably inserts through the connecting seat 2 and the vertical section of the T-shaped connecting plate. A four-corner plate is fixedly provided at the upper end of the sliding column. A return spring 1 is fixedly provided between the upper side of the connecting seat 2 and the lower side of the four-corner plate. The return spring is sleeved on the surface of the sliding column. A return spring 2 is fixedly provided on the upper side of each of the four corners of the four-corner plate. A balance plate is fixedly connected to the upper end of the return spring 2. The lower end of the rotating shaft is rotatably connected to the upper side of the balance plate. A hinge plate is fixedly provided in the middle of the upper side of the four-corner plate. The upper end of the hinge plate is rotatably connected to the lower end of the balance plate.

[0015] According to an advantageous embodiment, the lifting assembly includes a serpentine track composed of two serpentine plates of different sizes, which are laid side by side on the front middle section of the conveying channel. The upper surface of the serpentine plates is provided with a three-section, gradually increasing stepped surface along the spraying and conveying direction of the interior plastic parts. Each stepped surface has an initial section with a loading ramp and an unloading ramp at the end of the final stepped surface. Two slides are fixedly provided on the lower side of the balance plate, and guide balls are rotatably provided on the lower side of the slides. The guide balls are rotatably connected to the upper side of the corresponding serpentine plate.

[0016] According to an advantageous embodiment, the spraying mechanism includes a second mounting platform fixedly installed on the ground. A fixing rod is fixedly installed on the upper side of the second mounting platform via two left and right lugs. Multiple spray guns are fixedly installed on the fixing rods. An angle adjustment component is provided between the spray guns and the second mounting platform.

[0017] According to an advantageous embodiment, the angle adjustment assembly includes an adjustment screw rotatably disposed on the upper side of the second mounting frame, a slider threaded on the adjustment screw, the slider being slidably disposed on the upper side of the second mounting frame, a transmission plate being hinged together between the slider and the spray gun, and a rotating handle being fixedly disposed on the front side of the second mounting frame at one end of the adjustment screw.

[0018] Compared with existing technologies, the automatic paint spraying device provided in this invention has the following beneficial effects: 1. In this invention, by cooperating with the spraying conveyor and the transport components, the traditional linear conveying is changed to a serpentine conveying channel, so that while the paint sprayed by the spraying mechanism acts on the foremost interior plastic parts, the diffused paint can be received by the interior plastic parts waiting in line behind. Furthermore, the serpentine feeding and conveying path allows most of the interior plastic parts to be sprayed to gather together, expanding the paint receiving area and significantly reducing paint waste from drifting onto the worktable.

[0019] 2. In this invention, the lifting component lifts the interior plastic parts in a stepped manner along a serpentine moving path, so that the interior plastic parts on the entire spraying conveyor are distributed in a stepped manner in the spraying area, and the paint sprayed by the spray gun at an angle can more evenly cover the surface of the workpiece to be sprayed on the back side.

[0020] 3. In this invention, the time for formal painting of interior plastic parts is shortened by automatic pre-painting, thereby avoiding the problem of paint waste caused by the need for long-term rotation of interior plastic parts for full painting. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of the overall external structure of the present invention.

[0022] Figure 2 This is a partial sectional planar structural diagram of the main view of the present invention.

[0023] Figure 3 This is a three-dimensional structural diagram of the support component in this invention.

[0024] Figure 4 This is a three-dimensional structural diagram of the lifting component in this invention.

[0025] Figure 5 This is a schematic diagram showing the relative positions of the lifting component and the supporting component in this invention.

[0026] Figure 6 This is an external three-dimensional structural diagram of the spraying mechanism in this invention.

[0027] Figure 7 This is a schematic diagram showing the relative positions of various interior plastic parts during the spraying process of the spraying mechanism in this invention.

[0028] Figure 8 This is a partial structural diagram of the transport component in this invention.

[0029] Figure 9 This is a schematic diagram of the spraying table in the spraying conveyor.

[0030] Figure reference numerals: 1. Spraying conveyor table; 2. Conveying mechanism; 21. Transport component; 22. Support component; 221. Connecting part; 2211. Connecting seat one; 2212. T-shaped connecting plate; 2213. Connecting seat two; 222. Rotating shaft; 223. Actuating frame; 224. Support plate; 225. Movable part; 2251. Sliding column; 2252. Four corner plates; 2253. Return spring one; 2254. Return spring two; 225 5. Balance plate; 2256. Hinge plate; 2257. Slide; 23. Lifting assembly; 231. Serpentine plate; 232. Stepped surface; 233. Loading ramp; 234. Unloading ramp; 24. Drive assembly; 241. Drive plate; 242. Paddle plate; 3. Spraying mechanism; 31. Fixing rod; 32. Spray gun; 33. Angle adjustment assembly; 331. Adjusting screw; 332. Slider; 333. Transmission plate; 4. Conveying channel. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 9 This application will now be described in further detail.

[0032] Please refer to the following: Figure 1 and Figure 9 An automatic paint spraying device includes a spraying conveyor table 1. The spraying conveyor table 1 includes a mounting frame fixedly installed on the ground. A spraying table is fixedly installed on the upper side of the mounting frame 1 by multiple columns. The spraying table consists of an outer frame and an inner guide plate. Both the outer frame and the inner guide plate are fixedly connected to the mounting frame 1 by corresponding columns. The inner side wall of the outer frame and the outer side wall of the inner guide plate together form a serpentine conveying channel 4 that is closed at both ends. An angle-adjustable spraying mechanism 3 is provided on the front side of the spraying conveyor table 1.

[0033] See Figure 1 and Figure 2 A conveying mechanism 2 is installed on the spray painting conveyor table 1. The conveying mechanism 2 includes a transport component 21 positioned between the mounting frame 1 and the spray painting table. The transport component 21 has a support component 22 for placing interior plastic parts, and a lifting component 23. A drive component 24 is located on the upper side and near the front of the spray painting conveyor table 1. Workers place the interior plastic parts on the support component 22, which is then transported along the conveying channel 4 via the transport component 21. When the interior plastic parts reach the spray painting mechanism 3, the drive component 24, in conjunction with each support component 22, controls the support component 22 to automatically rotate and receive the paint as it approaches the spraying position. It should be noted that... Figure 1 The diagram only shows the position of some of the support components 22 supporting the interior plastic parts. In actual use, multiple support components 22 are evenly arranged along the conveying channel 4 to support the interior plastic parts for spraying.

[0034] See Figure 2 and Figure 8 The transport component 21 includes multiple sprockets rotatably disposed between the mounting frame 1 and the spraying table, and a transport chain is sleeved on the multiple sprockets. The support component 22 is connected to the transport chain. A drive motor (not shown in the figure) is fixedly mounted on the mounting frame 1, and the output shaft of the drive motor is fixedly connected to one of the sprockets.

[0035] In practice, compared to the traditional method of linearly conveying interior plastic parts in a straight line, the transport component 21 transports all the supporting components 22 along the serpentine transport channel 4. This changes the original long-span, single-row material transport to a multi-row, serpentine, folded transport. When the spraying mechanism 3 at the front of the spraying conveyor 1 sprays the interior plastic parts at the front, a small portion of the paint adheres to the surface of the frontmost row of interior plastic parts. The remaining paint, which would otherwise be wasted, diffuses and spreads to the surfaces of the interior plastic parts waiting to be sprayed. The serpentine area of ​​the interior plastic parts forms a larger paint receiving surface, receiving the previously wasted paint and pre-spraying these parts. Figure 7 As shown. Furthermore, the serpentine spray pattern ensures that each side of the interior plastic parts queuing at the rear can receive paint by reversing direction, as... Figure 1 As shown, this not only reduces paint waste but also shortens the time required for the final painting of interior plastic parts, thus avoiding the paint waste caused by the need for prolonged rotation of interior plastic parts for thorough painting.

[0036] See Figure 2 and Figure 3 The supporting component 22 includes a connecting part 221 connected to the transport chain. The connecting part 221 includes a connecting seat 2211 fixedly connected to the transport chain. A T-shaped connecting plate 2212 is fixedly connected to the upper side of the connecting seat 2211. A disc-shaped connecting seat 2213 is fixedly connected to the vertical section of the T-shaped connecting plate 2212. Multiple guide balls are provided on the upper side of the horizontal section of the T-shaped connecting plate 2212 and the lower side of the connecting seat 2213. The guide balls are rolledly connected to the corresponding side wall of the spraying table, facilitating sliding on the spraying table. The T-shaped connecting plate 2212 is slidably disposed within the conveying channel 4. The movement of the transport chain drives the corresponding connecting seat 2213 to move.

[0037] See Figure 2 , Figure 3 and Figure 5A rotating shaft 222 is provided above the connecting part 221, and an actuating frame 223 is provided on the rotating shaft 222. A support plate 224 that is compatible with the interior plastic parts is fixedly connected to the upper end of the rotating shaft 222. The actuating frame 223 includes a rotating sleeve that is rotatably sleeved on the surface of the rotating shaft 222, and multiple actuating levers are fixedly provided on the surface of the rotating sleeve along its circumference. The drive assembly 24 includes a drive plate 241 that is fixedly mounted on the upper side of the spraying table by two L-shaped fixing plates on the left and right. Multiple toggle plates 242 are fixedly provided on the front side of the drive plate 241 along its length, and the actuating levers are rotatably engaged with the multiple toggle plates 242. To ensure that the interior plastic parts can be fully coated during the actual painting process, when the actuating frame 223 moves to the position of the painting mechanism 3 driven by the transport chain, the actuating rod on the rotating sleeve surface will come into contact with the actuating plate 242 on the right side during the movement of the actuating frame 223. This causes the actuating rod to rotate while driving the rotating shaft 222 to rotate, which in turn causes the support plate 224 on which the interior plastic parts are placed to rotate.

[0038] See Figure 2 and Figure 3 A movable part 225 for driving the support plate 224 to rise and fall is provided between the lower end of the rotating shaft 222 and the connecting part 221. The movable part 225 includes a sliding column 2251 that is slidably inserted into the upper side of the connecting seat 2213. The lower end of the sliding column 2251 slidably inserts through the connecting seat 2213 and the vertical section of the T-shaped connecting plate 2212. A four-corner plate 2252 is fixedly provided at the upper end of the sliding column 2251. A common fixed part is provided between the upper side of the connecting seat 2213 and the lower side of the four-corner plate 2252. A return spring 2253 is provided and sleeved on the surface of the sliding column 2251. Return springs 2254 are fixedly installed on the upper sides of the four corner plates 2252. The upper ends of the return springs 2254 are all fixedly connected to a balance plate 2255. The lower end of the rotating shaft 222 is rotatably connected to the upper side of the balance plate 2255. A hinge plate 2256 is fixedly installed in the middle of the upper side of the four corner plates 2252, and the upper end of the hinge plate 2256 is rotatably connected to the lower end of the balance plate 2255. The balance plate 2255 can slide up and down to adjust its height via the sliding column 2251, thereby adjusting the height of the upper support plate 224. Simultaneously, the balance plate 2255 can rotate relative to the four corner plates 2252, facilitating cooperation with the lifting assembly 23 to raise the support plate 224.

[0039] See Figure 1 , Figure 3 , Figure 4 and Figure 5The lifting assembly 23 includes a serpentine track, which consists of two serpentine plates 231 of different sizes. The two serpentine plates 231 are laid side by side on the front and middle sections of the conveying channel 4. The upper surface of the serpentine plate 231 is provided with three stepped surfaces 232 along the spraying and conveying direction of the interior plastic parts. Each step surface 232 has a loading ramp 233 at its initial section and a unloading ramp 234 at its final section. Two slides 2257 are fixedly provided on the lower side of the balance plate 2255. Guide balls 2257 are rotatably provided on the lower side of the slides 2257. The guide balls 2257 are rotatably connected to the upper side of the corresponding serpentine plate 231.

[0040] In actual operation, to fully receive the remaining paint after spraying, the balance plate 2255 moves along the conveyor channel 4 along the conveyor chain. The slide 2257 on the lower side of the balance plate 2255 contacts the serpentine plate 231 and slides along the first loading ramp 233 until the balance plate 2255 moves onto the first step surface 232. At this time, the balance plate 2255 is raised to a certain height. As the conveyor moves closer to the spraying mechanism 3, the height of the interior plastic parts in the serpentine area above the entire spraying table decreases in a stepped manner from front to back. Figure 7 As shown, this allows the paint sprayed by the spraying mechanism 3 from front to back to fall as much as possible onto the surface of the interior plastic parts to be sprayed on the rear side, maximizing paint absorption and further reducing paint waste.

[0041] See Figure 1 and Figure 6 The spraying mechanism 3 includes a mounting frame 2 fixedly installed on the ground. A fixing rod 31 is rotatably installed on the upper side of the mounting frame 2 via two left and right lugs. Multiple spray guns 32 are fixedly installed on the fixing rod 31. The spray guns 32 are evenly distributed in the left and right direction. An angle adjustment component 33 is provided between the spray guns 32 and the mounting frame 2.

[0042] See Figure 6 The angle adjustment assembly 33 includes an adjustment screw 331 rotatably mounted on the upper side of the mounting platform 2. A slider 332 is threaded onto the adjustment screw 331 and slidably mounted on the upper side of the mounting platform 2. A transmission plate 333 is hinged between the slider 332 and the spray gun 32. One end of the adjustment screw 331 movably passes through the front side of the mounting platform 2 and is fixedly mounted with a rotating handle. The spray gun 32 is connected to an external material supply device to spray the interior plastic parts in the front row. The operator can rotate the rotating handle to drive the adjustment screw 331 to rotate, thereby moving the slider 332, which in turn causes the transmission plate 333 to rotate, changing the angle of the spray gun 32.

[0043] The entire workflow of the processing equipment is as follows: The left front corner of the spraying conveyor 1 is set as the loading and unloading area. The operator places the interior plastic parts on the support plate 224. The drive motor drives the sprocket to rotate, causing the transport chain to move and the support plate 224 to move along the conveying channel 4. When the support plate 224 approaches the first loading ramp 233 of the serpentine plate 231, the slide 2257 on the lower side of the balance plate 2255 abuts against the loading ramp 233. As it moves, the slide column 2251 moves upward relative to the corresponding connecting seat 2213, and the support plate 224 rises in height. Then the support plate 224 moves along the first step surface 232 of the serpentine plate 231 and rises to the second step surface 232 and the third step surface 232 in the same way. When the interior plastic parts move to the third step surface 232, they are sprayed by the spray gun 32. Simultaneously, after the rotating shaft 222 moves to the third step surface 232, the lever on the actuating bracket 223 will abut against the lever 242 on the front side of the drive plate 241 and rotate, driving the support plate 224 to rotate the interior plastic parts to receive the paint. Finally, after the paint is finished, it returns to the initial position from the unloading ramp 234 and performs loading and unloading operations, repeating this process.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0045] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic paint spraying apparatus comprising a spraying conveyor table, characterised in that: The spraying conveying table is provided with a conveying mechanism, and the front side of the spraying conveying table is further provided with an angle-adjustable spraying mechanism; The conveying mechanism comprises a closed conveying assembly arranged on the spraying conveying table and used for batch conveying of the interior plastic parts, the conveying assembly is provided with a supporting assembly used for placing the interior plastic parts, and the conveying assembly is further provided with a lifting assembly; the driving assembly is arranged on the upper side of the spraying conveying table and close to the front side, and cooperates with each supporting assembly to control the supporting assembly to automatically rotate to receive spraying when close to the spraying assembly; The supporting assembly comprises a connecting portion connected with the conveying assembly, the connecting portion is slidably connected with the spraying conveying table, a rotating shaft is arranged above the connecting portion, a rotating frame is arranged on the rotating shaft, the rotating frame rotates in cooperation with the driving assembly, a supporting plate adapted to be clamped with the interior plastic part is fixedly connected to the upper end of the rotating shaft, and a movable portion for driving the supporting plate to lift is arranged between the lower end of the rotating shaft and the connecting portion, the movable portion moves with the conveying assembly and is gradually lifted by the lifting assembly in each different area of the spraying conveying table; The rotating sleeve is arranged on the surface of the rotating shaft, a plurality of rotating rods are fixedly arranged on the surface of the rotating sleeve along the circumferential direction of the rotating sleeve; The driving assembly comprises a driving plate fixedly arranged on the upper side of the spraying table plate through the left and right two L-shaped fixed plates, a plurality of rotating plates are fixedly arranged on the front side of the driving plate along the length direction of the driving plate, and the rotating rods rotate in cooperation with the plurality of rotating plates; The movable portion comprises a sliding column slidably inserted into the upper side of the connecting seat two, the lower end of the sliding column is movably penetrated through the connecting seat two and slidably inserted into the vertical segment of the T-shaped connecting plate, a four-corner plate is fixedly arranged on the upper end of the sliding column, a reset spring one is fixedly arranged between the upper side of the connecting seat two and the lower side of the four-corner plate, the reset spring one is sleeved on the surface of the sliding column, a reset spring two is fixedly arranged on the upper side of each corner of the four-corner plate, a balance plate is fixedly connected to the upper ends of the reset spring two, the lower end of the rotating shaft is rotatably connected to the upper side of the balance plate, a hinged plate is fixedly arranged on the upper side of the middle part of the four-corner plate, and the upper end of the hinged plate is rotatably connected to the lower end of the balance plate; The lifting assembly comprises a snake-shaped track, the snake-shaped track is composed of two snake-shaped track plates with different sizes, the two snake-shaped track plates are arranged side by side on the front middle segment path of the conveying channel, a three-segment and gradually increasing stepped surface is arranged on the upper side surface of each snake-shaped track plate along the spraying conveying direction of the interior plastic part, an initial segment of each stepped surface is provided with a feeding slope, and a tail segment of a tail stepped surface is further provided with a discharging slope, two sliding seats are fixedly arranged on the lower side of the balance plate, guide balls two are rotatably arranged on the lower side of the sliding seat, and the guide balls two are rotatably connected with the upper side of the corresponding snake-shaped track plate; The spraying mechanism comprises a mounting rack two fixedly arranged on the ground, a fixed rod rotatably arranged on the upper side of the mounting rack two through the left and right two ear seats, and a plurality of spraying guns fixedly arranged on the fixed rod, and an angle adjusting assembly is arranged between the spraying guns and the mounting rack two.

2. An automatic paint spraying device according to claim 1, wherein The spraying conveying table comprises a mounting rack one fixedly arranged on the ground, a spraying table plate fixedly arranged on the upper side of the mounting rack one through a plurality of stand columns, the spraying table plate is composed of an outer frame plate and an inner guide plate, the outer frame plate and the inner guide plate are fixedly connected with the mounting rack one through corresponding stand columns, and a conveying channel in a serpentine shape and closed at both ends is jointly formed between the inner side wall of the outer frame plate and the outer side wall of the inner guide plate.

3. An automatic paint spraying device according to claim 2, wherein The conveying assembly comprises a plurality of chain wheels rotatably arranged between the mounting rack one and the spraying table plate, a conveying chain is jointly sleeved between the plurality of chain wheels, the supporting assembly is connected with the conveying chain, a driving motor is fixedly arranged on the mounting rack one, and an output shaft of the driving motor is fixedly connected with one of the chain wheels.

4. An automatic paint spraying device according to claim 3, wherein The connecting portion comprises a connecting seat one fixedly connected with the conveying chain, a T-shaped connecting plate is fixedly connected to the upper side of the connecting seat one, a disc-shaped connecting seat two is fixedly connected to the vertical section of the T-shaped connecting plate, a plurality of guide balls one are arranged on the upper side of the horizontal section of the T-shaped connecting plate and the lower side of the connecting seat two, the guide balls one are rollingly connected with the corresponding side walls of the spraying table plate, and the T-shaped connecting plate is slidingly arranged in the conveying channel.

5. An automatic paint spraying device according to claim 1, wherein The angle adjusting assembly comprises an adjusting screw rotatably arranged on the upper side of the mounting rack two, a sliding block is threadedly arranged on the adjusting screw, the sliding block is slidingly arranged on the upper side of the mounting rack two, a transmission plate is jointly hinged between the sliding block and the spraying gun, and a rotating handle is fixedly arranged on one end of the adjusting screw and protrudes through the front side of the mounting rack two.

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