Automobile prime coat coating system

Abstract

The invention discloses an automobile prime coat coating system. The automobile prime coat coating system comprises a liquid supply system, a quantifying system, a coating device and an industrial robot. The coating device is mounted at the tail end of the industrial robot; the liquid supply system comprises an air treatment unit, a cleaning solvent pressure tank and a primer pressure tank; the air treatment unit is connected with an air source and used for filtering and drying the air source, the air treatment unit is connected with the cleaning solvent pressure tank through a first ventilation pipeline, and the cleaning solvent pressure tank is connected with the primer pressure tank through a second ventilation pipeline and a first liquid pipeline; the primer pressure tank is connected with the quantitative system through a second liquid pipeline, and the quantitative system is connected with the coating device through a third liquid pipeline; and control valves are arranged on the first ventilation pipeline, the second ventilation pipeline, the first liquid passing pipeline, the second liquid passing pipeline and the third liquid passing pipeline. According to the invention, the primer in the primer pressure tank and the pipeline can be effectively prevented from being cured and precipitated when meeting moisture, and the primer coating quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile glass primer coating devices, and more specifically, to an automobile primer coating system. Background Art

[0002] In the gluing process of automobile production, in order to increase the strength of the glue, the surface of the adhesive needs to be pre-treated before gluing. This pre-treatment process is called the primer process, and the raw material used is called the primer. Since the primer is particularly easy to solidify when exposed to moisture and is easy to precipitate, the existing automated equipment generally has the problem of pipeline blockage, the equipment is difficult to clean, and it is impossible to fully realize automation. It requires more manual participation and is difficult to maintain. In addition, due to the precipitation of the primer in the pipeline, it is also easy to cause changes in the flow rate in the pipeline, resulting in uneven primer amount and unstable primer quality. The primer contains volatile substances and is harmful to the human body. Long-term close contact operations are harmful to the health of operators. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] In order to achieve these purposes and other advantages according to the present invention, there is provided an automobile primer coating system, comprising: a liquid supply system, a dosing system, a coating device and an industrial robot; the coating device is installed at the end of the industrial robot; the liquid supply system comprises an air handling unit, a cleaning solvent pressure tank, and a primer pressure tank; the air handling unit is connected to an air source for filtering and drying the air source, the air handling unit is connected to the cleaning solvent pressure tank through a first ventilation line, and the cleaning solvent pressure tank is connected to the primer pressure tank through a second ventilation line and a first liquid line, respectively; the primer pressure tank is connected to the dosing system through a second liquid line, and the dosing system is connected to the coating device through a third liquid line; the first ventilation line, the second ventilation line, the first liquid line, the second liquid line and the third liquid line are all provided with control valves.

[0005] Preferably, the quantitative system is also connected to the primer pressure tank via a circulation pipeline, and a circulation valve is provided on one end of the circulation pipeline close to the quantitative system.

[0006] Preferably, the coating device comprises a mounting bracket connected to the end of the industrial robot, and a primer coating unit and an activator coating unit respectively mounted on the mounting bracket.

[0007] Preferably, the primer coating unit includes a first switch needle valve, a first connecting tube, a linear bearing and a spring, the linear bearing is fixedly connected to the mounting bracket and is sleeved on the first connecting tube; the upper end of the first connecting tube is connected to the first switch needle valve, and a brush is detachably connected to the lower end thereof, the spring is sleeved on the first connecting tube, one end of the spring is fixedly connected to the first switch needle valve, and the other end is fixedly connected to the linear bearing; the first switch needle valve is connected to the third liquid pipeline.

[0008] Preferably, the liquid supply system also includes an activator pressure tank, the air handling unit is connected to the activator pressure tank via a third ventilation pipeline, the activator pressure tank is connected to the activator coating unit via a fourth liquid pipeline, and control valves are provided on the third ventilation pipeline and the fourth liquid pipeline.

[0009] Preferably, the activator coating unit includes a telescopic cylinder, a second switch needle valve and a second connecting pipe, the telescopic cylinder is fixedly arranged on the mounting bracket, the movable end of the telescopic cylinder is fixedly connected to the second switch needle valve, the second switch needle valve is connected to the upper end of the second connecting pipe, and the lower end of the second connecting pipe is detachably connected with a brush.

[0010] Preferably, it also includes an automatic brush replacement and anti-hardening system, which includes a brush storage device, a brush detachment device and a brush installation device; the brush storage device includes a slide and a drive device, one end of the slide is provided with a discharge port, and the other end opposite to the discharge port is provided with a feed port, a plurality of brushes are placed in sequence between the discharge port and the feed port, and the drive device is used to drive the brush to slide along the slide; the brush detachment device includes a first positioning plate and a telescopic cylinder and a waste liquid box which are sequentially arranged below the first positioning plate, One side of the first positioning plate is provided with an opening for the brush to enter, and the movable end of the telescopic cylinder is provided with a stripping plate, and the stripping plate is clamped on the top of the brush; the brush installation device comprises a second positioning plate, a brush fixing block and a lifting cylinder which are arranged in sequence from top to bottom, the brush fixing block is arranged close to the discharge port of the slide, and a brush fixing groove is provided at one end abutting the discharge port; the second positioning plate is horizontally provided with a U-shaped groove on one side facing the slide; the movable end of the lifting cylinder is fixedly connected to the brush fixing block.

[0011] Preferably, the automatic brush replacement system and anti-hardening system also include an anti-hardening device, which includes an oil cup and a top cover movably arranged on the oil cylinder, the cleaning solvent pressure tank is connected to the oil cup through a fifth liquid pipeline, the bottom of the oil cup is connected to the waste liquid tank through a drain pipe, and control valves are provided on the fifth liquid pipeline and the drain pipe.

[0012] Preferably, a liquid level sensor is installed on the oil cup. The present invention has at least the following beneficial effects: 1. The automobile automatic primer coating system provided by the present invention provides clean and dry compressed air for the system through an air handling unit. The filtered and dried air first enters the cleaning solvent pressure tank, and then the dry air mixed with the cleaning solvent is transported to the primer pressure tank. This can effectively prevent the primer in the primer pressure tank from solidifying and precipitating when encountering moisture, thereby avoiding the precipitation of the primer in the pipeline, thereby ensuring the working efficiency and quality of the primer coating system.

[0013] 2. The automobile automatic primer coating system provided by the present invention first uses dry air through the air handling unit to remove the residual liquid in the primer flow pipeline, and then uses the cleaning solvent in the cleaning solvent pressure tank to clean the pipeline along the primer flow path, which can achieve thorough cleaning of the system management with high cleaning efficiency.

[0014] 3. The automobile automatic primer coating system provided by the present invention, by setting a circulation pipeline, allows the primer between the primer pressure tank and the quantitative system to be in a circulating flow state during the shutdown period, further avoiding the precipitation and accumulation of the primer in the relevant pipeline.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the automobile automatic primer coating system of the present invention; Figure 2 It is a structural schematic diagram of the industrial system of the present invention; Figure 3 It is a schematic diagram of the structure of the coating device of the present invention; Figure 4 It is a structural schematic diagram of the automatic brush replacement and anti-hardening system of the present invention; Figure 5 It is a structural schematic diagram of the brush storage device of the present invention; Figure 6 It is a structural schematic diagram of the brush installation device of the present invention; Figure 7 It is a structural schematic diagram of the brush separation device of the present invention; Figure 8 It is a schematic structural diagram of the anti-hardening device of the present invention; DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0018] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1 and Figure 2 As shown, the present invention provides an automobile primer coating system, comprising: a liquid supply system 2, a quantitative system 3, a coating device 5 and an industrial robot 4; the coating device 5 is installed at the end of the industrial robot 4; the liquid supply system 2 comprises an air processing unit 210, a cleaning solvent pressure tank 220, and a primer pressure tank 230; the air processing unit 210 is connected to an air source to filter and dry the air source, the air processing unit 210 is connected to the cleaning solvent pressure tank 220 through a first ventilation pipeline 241, and the cleaning solvent pressure tank 230 is connected to the cleaning solvent pressure tank 220 through a first ventilation pipeline 241. The washing solvent pressure tank 220 is connected to the primer pressure tank 230 through the second ventilation pipeline 242 and the first liquid pipeline 251 respectively; the primer pressure tank 230 is connected to the quantitative system 3 through the second liquid pipeline 252, and the quantitative system 3 is connected to the coating device 5 through the third liquid pipeline 253; the first ventilation pipeline 241, the second ventilation pipeline 242, the first liquid pipeline 251, the second liquid pipeline 252 and the third liquid pipeline 253 are all provided with control valves.

[0020] In this technical solution, the air processing unit 210 is used to provide clean, dry compressed air to the system. Figure 2 As shown, it may specifically include a pressure reducing filtration unit 211 and a drying unit 212, and conventional filtration devices and drying devices may be used; the air dried by multi-layer filtration enters the cleaning solvent pressure tank 220 through the first ventilation line 241, and the dry air mixed with the cleaning solvent is then transported to the primer pressure tank 230 through the second ventilation line 242, serving as a pressure source for the primer pressure tank 230, and can effectively prevent the primer in the primer pressure tank 230 from solidifying and precipitating when encountering moisture.

[0021] During coating operation, the control valves on the second liquid pipeline 252 and the third liquid pipeline 253 are opened, and the primer in the primer pressure tank 230 is input into the quantitative system 3 through the second liquid pipeline 252, and the liquid output entering the coating system is controlled by the quantitative system 3. The quantitative system 3 can select a servo quantitative cylinder commonly used in the art, and the industrial robot 4 controls the speed of the servo motor in the servo quantitative cylinder to adjust its liquid output. Preferably, a magnetic stirring device and a weighing device are sequentially provided at the bottom of the primer pressure tank 230, wherein the magnetic stirring device is used to drive the primer in the tank to flow and further prevent precipitation; the weighing device can sense the residual liquid amount in the bottle in real time through calibration, and will provide a low liquid level alarm if the primer dosage is lower than the set value; the top of the primer pressure tank 230 is equipped with a feeding funnel, and feeding can be achieved without opening the top cover; a filter 231 is added to the outlet of the primer pressure tank 230 to further reduce the solidified primer from entering the subsequent pipeline, thereby reducing the risk of clogging the pipeline.

[0022] During the cleaning operation, dry air is first introduced into the primer flow pipeline through the first ventilation pipeline 241 and the second ventilation pipeline 242 to blow the residual liquid in the pipeline into the waste liquid box. Then the control valves on the first liquid pipeline 251, the second liquid pipeline 252 and the third liquid pipeline 253 are all opened, and the cleaning solvent in the cleaning solvent pressure tank 220 enters the primer pressure tank 230 through the first liquid pipeline 251, and cleans the equipment and pipelines along the primer flow path, and the waste liquid after cleaning enters the waste liquid box from the coating device 5.

[0023] like Figure 1 As shown, the automobile automatic primer coating system further includes a control system 1, which can adopt a conventional automatic control system to control the opening and closing of each device and each control valve in the automobile automatic primer coating system through a built-in control module and program, thereby realizing automatic coating of the primer and automatic cleaning of each liquid pipeline.

[0024] In another technical solution, Figure 2 As shown, the quantitative system 3 is also connected to the primer pressure tank 230 via a circulation pipeline 260 , and a circulation valve is provided on one end of the circulation pipeline 260 close to the quantitative system 3 .

[0025] When there is no coating operation, the automatic circulation mode can be turned on, and the control system 1 can be set to circulate for m minutes when the production stops for more than n minutes according to the production status and production mode; when there is a coating operation, the automatic circulation mode is suspended and the circulation valve is closed. In the automatic circulation mode, the quantitative system 3 first extracts the primer through the second liquid pipeline 252, then closes the control valve on the second liquid pipeline 252, opens the circulation valve, and the quantitative system 3 discharges the liquid back to the primer pressure tank 230 through the circulation valve. The control valve on the second liquid pipeline 252 is set close to the quantitative system 3; through automatic circulation, the liquid in the pipeline is in a flowing state, which effectively prevents the primer from precipitating and accumulating. During the cleaning operation, the automatic circulation pipeline 260 can also be opened; a part of the cleaning solvent coming out of the quantitative system 3 enters the coating device, and the other part enters the circulation pipeline 260, and after returning to the primer pressure tank 230, it is discharged into the waste liquid tank 232.

[0026] In another technical solution, referring to Figure 3 The coating device 5 includes a mounting bracket 510 connected to the end of the industrial robot 4, and a primer coating unit 520 and an activator coating unit 530 respectively mounted on the mounting bracket 510. The industrial robot 4 drives the primer coating unit 520 and the activator coating unit 530 through the mounting bracket 510 to apply the primer and the activator respectively.

[0027] Specifically, the primer coating unit 520 includes a first switch needle valve 521, a first connecting pipe 524, a linear bearing 523 and a spring 522. The linear bearing 523 is fixedly connected to the mounting bracket 510 and sleeved on the first connecting pipe 524. The upper end of the first connecting pipe 524 is connected to the first switch needle valve 521, and the lower end thereof is detachably connected with a brush. The spring 522 is sleeved on the first connecting pipe 524, one end of which is fixedly connected to the first switch needle valve 521, and the other end of which is fixedly connected to the linear bearing 523. The first switch needle valve 521 is connected to the third liquid pipeline 253. The primer in the third liquid pipeline 253 reaches the brush 540 through the first switch needle valve 521 and the first connecting pipe 524 in sequence. The linear bearing 523 and the spring 522 constitute a brush floating mechanism. During the primer application process, the first switch needle valve 521, the first connecting pipe 524 and the brush 540 fall under their own gravity. The spring 522 installed on the upper part of the linear bearing 523 provides an opposite elastic force to ensure that the force of squeezing the brush 540 during the application process is consistent, thereby ensuring the uniform width of the primer application and the quality of the primer. Preferably, the coating device 5 also includes a visual system 550 installed on the mounting bracket 510, which includes a visual camera 551 and a light source assembly 552. The visual addition 551 is used to detect the primer quality in real time, and the image data captured is transmitted back to the control system 1, and judged by the built-in image analysis program, and timely warnings are given to products with poor quality to ensure that defective products will not flow into the next process.

[0028] In another technical solution, Figure 2 As shown, the liquid supply system 2 further includes an activator pressure tank 240, the air processing unit 210 is connected to the activator pressure tank 240 through a third ventilation pipeline 243, and the activator pressure tank 240 is connected to the activator coating unit 530 through a fourth liquid pipeline 254, and control valves are provided on the third ventilation pipeline 243 and the fourth liquid pipeline 254. The compressed air filtered and dried by the air processing unit 210 enters the activator pressure tank 240 through the third ventilation pipeline 243 to provide pressure to the activator pressure tank 240, and the activator in the tank enters the activator coating unit 530 through the fourth liquid pipeline 254. The activator pressure tank 240 is also provided with a pressure regulating valve to adjust the pressure in the activator pressure tank.

[0029] Further, refer to Figure 3The activator coating unit 530 includes a telescopic cylinder 531, a second switch needle valve 532 and a second connecting pipe 533. The telescopic cylinder 531 is fixedly arranged on the mounting bracket 510. The movable end of the telescopic cylinder 531 is fixedly connected to the second switch needle valve 532. The second switch needle valve 532 is connected to the upper end of the second connecting pipe 533. The lower end of the second connecting pipe 533 is detachably connected with a brush 540. The activator passes through the second switch needle valve 532 and the second connecting pipe 533 from the fourth liquid pipeline 254 in sequence and then reaches the brush 540.

[0030] In another technical solution, Figure 1 As shown, the automobile automatic primer coating system also includes an automatic brush replacement and anti-hardening system 6, which includes a brush storage device 610, a brush detachment device 620 and a brush installation device 630; the brush storage device includes a slide 611 and a drive device 612, one end of the slide 611 is provided with a discharge port, and the other end is provided with a feed port, a plurality of brushes are sequentially placed between the discharge port and the feed port, and the drive device is used to drive the brush to slide along the slide; the brush detachment device 620 includes a first positioning plate 621 and a telescopic cylinder and a waste liquid box 612 sequentially arranged below the first positioning plate 621 23. An opening for the brush to enter is provided on one side of the first positioning plate 621, and a stripping plate 622 is provided on the movable end of the telescopic cylinder, and the stripping plate 622 is clamped on the top of the brush; the brush installation device 630 includes a second positioning plate 631, a brush fixing block 632 and a lifting cylinder 633 arranged in sequence from top to bottom, the brush fixing block 632 is arranged close to the discharge port of the slide 611, and a brush fixing groove is provided on the side abutting the discharge port; the second positioning plate is horizontally provided with a U-shaped groove on one side facing the slide; the movable end of the lifting cylinder 633 is fixedly connected to the brush fixing block 632.

[0031] like Figure 4 As shown, the brush storage device 610, the brush separation device 620 and the brush installation device 630 are all integrated and installed in a cabinet. Figure 5 , a plurality of brushes 540 can be stored on the slide 611 of the brush storage device 610. Whenever the brush on the discharge port is removed, the driving device 612 pushes the remaining brushes from the tail to the direction of the feed port to the discharge port until the next brush 540 reaches the discharge port. Preferably, the driving device 612 can select a rodless cylinder. Preferably, the brush 540 is plug-connected with the corresponding first connecting pipe 524 or the second connecting pipe 533. Figure 7In the brush detachment device 620, the first positioning plate 621 is used to provide position guidance for the coating device 5. The primer coating unit 520 or the activator coating unit 530 extends the brush at its end into the opening on the first positioning plate 621. At this time, the stripping plate is clamped at the end of the brush, that is, the connection between the brush and the first connecting tube 524 or the second connecting tube 533. Then, the stripping plate 622 is driven downward by the telescopic cylinder, so that the brush can be separated from the first connecting tube 524 or the second connecting tube 533 and fall into the waste liquid box 623 below; then the telescopic cylinder is reset to drive the stripping plate 622 back to the initial position. The coating device 5 then moves to the brush mounting device 630, with reference to Figure 6 , extend the connecting end of the first connecting tube 524 or the second connecting tube 533 and the brush into the U-shaped groove of the second positioning plate 631, the driving device 612 pushes the brush from the discharge port into the brush fixing groove, and then the lifting cylinder 633 lifts the brush positioning block 632 upward until the brush and the first connecting tube 524 or the second connecting tube 533 are completely plugged in; the coating device 5 is removed from the opening of the U-shaped groove of the second positioning plate 631.

[0032] like Figure 8 As shown, the automatic brush replacement system and anti-hardening system 6 also include an anti-hardening device 640, which includes an oil cup 642 and a top cover 641 movably arranged on the oil cylinder 642. The cleaning solvent pressure tank 230 is connected to the oil cup 642 through the fifth liquid pipe 255. The bottom of the oil cup 642 is connected to the waste liquid tank 644 through the drain pipe 643. The fifth liquid pipe 255 and the drain pipe 643 are both provided with control valves. When the production gap exceeds a certain time, the industrial robot 4 will drive the coating device 5 to put the brush into the oil cup 642. The oil cup 642 is filled with cleaning solvent as an anti-hardening agent through the fifth liquid pipe 255. The used anti-hardening agent is discharged into the waste liquid tank 644 through the drain pipe 643 for storage. Preferably, a flexible joint is provided between the drain pipe 643 and the oil cup 642 to facilitate disassembly, cleaning and maintenance. A scraper plate 624 is provided above the waste liquid box 623. The brush taken out from the oil cup 642 is pressed on the scraper plate 624 to squeeze out the anti-hardening agent remaining in the brush. The cup cover 641 can automatically cover the oil cup 642 to prevent volatilization when the oil cup 642 is not in use. Specifically, a connecting rod 647 is connected to the cup cover 641, and the other end of the connecting rod 647 is connected to the rotating shaft of the rotating cylinder 645. The rotating cylinder 645 drives the cup cover 641 to leave or cover the oil cup 642.

[0033] Furthermore, a liquid level sensor 646 is installed on the oil cup 642. When the liquid level sensor 646 detects that the liquid level is insufficient, a signal is given to the control system 1, and the control system 1 controls the control valve on the fifth liquid pipeline 255 to open, and injects the cleaning solvent into the oil cup 642. When the liquid level in the oil cup 642 rises to be detected by the liquid level sensor 646, a signal is given to the control system 1, and the corresponding control valve is controlled to close, and the solvent supply is stopped.

[0034] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An automotive primer coating system, characterized in that: include: A liquid supply system, a dosing system, a coating device and an industrial robot; the coating device is installed at the end of the industrial robot; the liquid supply system includes an air handling unit, a cleaning solvent pressure tank, and a primer pressure tank; the air handling unit is connected to an air source to filter and dry the air source, the air handling unit is connected to the cleaning solvent pressure tank through a first ventilation line, and the cleaning solvent pressure tank is connected to the primer pressure tank through a second ventilation line and a first liquid line respectively; the primer pressure tank is connected to the dosing system through a second liquid line, and the dosing system is connected to the coating device through a third liquid line; the first ventilation line, the second ventilation line, the first liquid line, the second liquid line and the third liquid line are all provided with control valves.

2. The automotive automatic primer coating system according to claim 1, characterized in that: The quantitative system is also connected to the primer pressure tank via a circulation pipeline, and a circulation valve is provided on one end of the circulation pipeline close to the quantitative system.

3. The automotive automatic primer coating system according to claim 1, characterized in that: The coating device includes a mounting bracket connected to the end of the industrial robot, and a primer coating unit and an activator coating unit respectively mounted on the mounting bracket.

4. The automotive automatic primer coating system according to claim 3, characterized in that: The primer coating unit includes a first switch needle valve, a first connecting tube, a linear bearing and a spring. The linear bearing is fixedly connected to the mounting bracket and is sleeved on the first connecting tube. The upper end of the first connecting tube is connected to the first switch needle valve, and a brush is detachably connected to the lower end thereof. The spring is sleeved on the first connecting tube, one end of which is fixedly connected to the first switch needle valve, and the other end is fixedly connected to the linear bearing. The first switch needle valve is connected to the third liquid pipeline.

5. The automotive automatic primer coating system according to claim 3, characterized in that: The liquid supply system also includes an activator pressure tank, the air handling unit is connected to the activator pressure tank through a third ventilation pipeline, the activator pressure tank is connected to the activator coating unit through a fourth liquid pipeline, and control valves are provided on the third ventilation pipeline and the fourth liquid pipeline.

6. The automotive automatic primer coating system according to claim 5, characterized in that: The activator coating unit includes a telescopic cylinder, a second switch needle valve and a second connecting pipe. The telescopic cylinder is fixedly arranged on the mounting bracket, the movable end of the telescopic cylinder is fixedly connected to the second switch needle valve, the second switch needle valve is connected to the upper end of the second connecting pipe, and the lower end of the second connecting pipe is detachably connected with a brush.

7. The automotive automatic primer coating system according to claim 1, characterized in that: It also includes an automatic brush replacement and anti-hardening system, which includes a brush storage device, a brush detachment device and a brush installation device; the brush storage device includes a slide and a drive device, one end of the slide is provided with a discharge port, and the other end opposite to the discharge port is provided with a feed port, a plurality of brushes are placed in sequence between the discharge port and the feed port, and the drive device is used to drive the brush to slide along the slide; the brush detachment device includes a first positioning plate and a telescopic cylinder and a waste liquid box arranged in sequence below the first positioning plate, one side of the first positioning plate is provided with an opening for the brush to enter, and the movable end of the telescopic cylinder is provided with a stripping plate, and the stripping plate is clamped on the top of the brush; the brush installation device includes a second positioning plate, a brush fixing block and a lifting cylinder arranged in sequence from top to bottom, the brush fixing block is arranged close to the discharge port of the slide, and a brush fixing groove is provided at one end abutting against the discharge port; the second positioning plate is horizontally provided with a U-shaped groove toward one side of the slide; the movable end of the lifting cylinder is fixedly connected to the brush fixing block.

8. The automotive automatic primer coating system according to claim 7, characterized in that: The automatic brush replacement system and anti-hardening system also include an anti-hardening device, which includes an oil cup and a top cover movably arranged on the oil cylinder. The cleaning solvent pressure tank is connected to the oil cup through a fifth liquid pipeline, and the bottom of the oil cup is connected to the waste liquid tank through a drain pipe. Control valves are arranged on the fifth liquid pipeline and the drain pipe.

9. The automotive automatic primer coating system according to claim 8, characterized in that: A liquid level sensor is installed on the oil cup.

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