Automobile whole vehicle spraying system and method

Abstract

This invention provides an automotive painting system and method in the field of vehicle processing technology, comprising: a painting chamber with an air intake channel at its bottom; and painting robots distributed on both sides of the painting chamber. The invention is characterized by further comprising: a wind circulation device, which includes: a paint filter assembly that transports lime powder from top to bottom and arranges it in a dispersed state to treat the inhaled painting air; as the treated lime powder passes through the paint filter assembly with the painting air, the paint filter assembly forms a raised shape, causing the lime powder adhering to the paint filter assembly to detach; and a centralized filter assembly installed above the paint filter assembly to perform secondary filtration of the air discharged from the paint filter assembly. This invention has advantages such as good filtration effect of the circulating airflow during automotive painting and good adsorption effect of lime powder on paint.

Description

Technical Field

[0001] This invention relates to the field of vehicle processing technology, and in particular to an automotive painting system and method. Background Technology

[0002] In the process of painting automobiles, robots are used to control the spray guns, ensuring that they maintain the correct angle and constant distance from the surface to be painted. A wind circulation system is also often used to guide the spray air generated by the spray gun to a filter screen for filtration. In order to remove paint from the spray air, lime powder is sprinkled under the filter screen to adsorb the paint. The filtered gas is then blown back into the spray chamber by a fan to carry the spray air flow for repeated filtration. The lime powder after multiple adsorption processes is recycled as a raw material for the cement industry or flue gas desulfurization.

[0003] Chinese patent CN101966502B discloses a hybrid automotive painting robot based on a parallel mechanism of three degrees of freedom in space and planar plane. It includes a gantry frame and four painting operation module units. The first and fourth painting operation modules have the same structure, and the second and third painting operation modules have the same structure. By combining the horizontal movement of the gantry frame with the movement of the painting operation module units, the position and orientation of the atomizer nozzles of each painting module unit can be controlled, thereby completing the whole vehicle painting operation of the car to be painted.

[0004] However, while this technical solution can complete the painting of vehicles, the painting process is exposed in the workshop, which can easily cause paint pollution to the surrounding area. In the traditional paint circulation filtration process, when lime powder is used, it is directly sprinkled under the filter screen multiple times and then recycled, resulting in incomplete utilization of lime powder. Moreover, the filter screen is also prone to being contaminated with lime powder with paint on it. Since the filter screen is arranged perpendicular to the airflow direction, it is difficult to quickly clean the lime powder adsorbed on the surface of the filter screen. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an automotive whole-vehicle painting system and method. Through the airflow of the exhaust assembly, spraying air is drawn in through the inlet channel. The powder-spraying assembly then disperses lime powder to adsorb paint, and the mixture circulates downwards to the bottom of the filter assembly. Finally, it is guided to the next stage for further processing by the conveying assembly. Simultaneously, the guide rod and push rod create raised surfaces on the filter screen. The spraying airflow acts on these raised surfaces, blowing away the lime powder adsorbed on the filter screen. This ensures the filter screen throughput while achieving multi-stage utilization of the lime powder for paint adsorption.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A vehicle painting system includes: a painting chamber with an air intake channel at its bottom; and painting robots distributed on both sides of the painting chamber. The system further includes: a wind circulation device comprising: a paint filter assembly that transports lime powder from top to bottom and disperses it to treat the inhaled painting air; as the treated lime powder passes through the paint filter assembly with the painting air, the paint filter assembly forms a raised shape, causing the lime powder adhering to it to detach; a centralized filter assembly installed above the paint filter assembly to perform secondary filtration of the exhaust gas from the paint filter assembly; and an exhaust assembly installed above the centralized filter assembly to provide suction power to the centralized filter assembly and the paint filter assembly, and to discharge the exhaust gas downwards to the top of the painting chamber.

[0008] Furthermore, the paint filter assembly includes: a housing, with an inlet channel on one side of the bottom of the housing, through which the spraying airflow is introduced from bottom to top; a filter screen assembly, which is arranged in a stepped manner from top to bottom within the housing; and a powder polishing assembly, which is correspondingly disposed below each of the filter screen assemblies, and throws lime powder onto the raised surface of the filter screen assembly. The falling lime powder falls to the other side below the filter screen assembly and is conveyed to the next stepped powder polishing assembly for polishing.

[0009] Furthermore, the filter assembly includes: a filter screen, both ends of which are mounted on the housing; a guide rod that slides through both sides of the filter screen, guiding both sides of the filter screen back and forth in a curved arrangement; and a pushing assembly connected to the guide rod, the contact surface between the pushing assembly and the filter screen corresponding to the curved shape.

[0010] Furthermore, the guide rod includes: a straight guide rod; and a curved guide rod connected to one end of the straight guide rod, the curved guide rod being wave-shaped.

[0011] Furthermore, the propelling assembly includes: a propelling bracket; a propelling rod, a plurality of the propelling rods being mounted on the propelling bracket; and a propelling power component, the power output end of the propelling power component being connected to the propelling bracket; one end of the guide rod being mounted on the power output end of the propelling power component.

[0012] Furthermore, the push rod has a hollow structure, and each of the lower surfaces of the push rod is provided with an air jet.

[0013] Furthermore, the powder-dissolving assembly includes: a powder-dissolving chamber located at the bottom of the housing; a powder-lifting roller installed inside the powder-dissolving chamber along its length; a powder-collecting chamber located on one side of the powder-dissolving chamber; and a circulating powder-feeding assembly that guides the lime powder collected in the powder-collecting chamber to the powder-dissolving chamber of the next step.

[0014] Furthermore, the circulating powder feeding assembly includes: a powder output screw installed at the lower end of the powder collection chamber; a powder input screw installed on one side of the powder blasting chamber to input lime powder into the powder blasting chamber; and a guiding assembly located on the outside of the housing to transport the lime powder from the powder output screw of the previous step to the powder input screw of the next step.

[0015] Furthermore, the housing includes an air intake duct formed on one side of the powder-discharging chamber; the air intake duct connects the lower part of the filter assembly of the previous step to the top of the filter assembly of the next step.

[0016] The present invention also provides a method for filtering spray gases in an automotive painting system, characterized by comprising the following steps:

[0017] Step 1: Drain the spraying air. The exhaust unit blows air out from the top of the spraying chamber, guiding the spraying air generated by the spraying robot into the air intake channel.

[0018] Step 2: Powdering to remove paint. The spraying air enters the inlet channel through the air inlet channel and passes through the stepped filter screens in sequence. When passing through the filter screens, the powder-spraying roller throws the lime powder in the powder-spraying chamber toward the bottom of the filter screen and combines with the spraying air to suck away the paint.

[0019] Step 3: Circulating downward material movement. The lime powder falls into the powder collection chamber as it is pushed down by the airflow of the spraying air. It is then discharged by the powder output screw and guided by the conveying component to the powder input screw of the next step. The powder is then discharged into the corresponding powder throwing chamber through the powder input screw until it falls into the powder throwing chamber of the bottom group and is discharged and collected by the powder output screw.

[0020] Step 4: Cleaning the screen. During the process of step 2, the pushing power component simultaneously drives the guide rod and the push rod to move back and forth on the filter screen, so that the raised shape on the lower surface of the filter screen is in a moving state. Under the action of the airflow force of the spraying air, the lime powder adhering to the surface of the raised filter screen is blown down obliquely along the raised direction.

[0021] Step 5: Secondary filtration. After the airflow is treated by the paint filter assembly, it is filtered a second time by the centralized filter assembly. The exhaust assembly then circulates the filtered airflow and discharges it from the top of the spray booth.

[0022] The beneficial effects of this invention are as follows:

[0023] (1) The present invention can achieve multi-stage treatment of spraying gas with lime powder by the cooperation between the multi-stage filter screen assembly and the powder blasting assembly, so as to ensure the cleanliness of the gas filtered out from the top layer, and at the same time realize the efficient adsorption and use of lime powder.

[0024] (2) By cooperating with each other, the present invention can realize the transfer and reuse of lime powder processed in the previous stage to the next stage of the powder-dissolving chamber, thereby improving the utilization rate of lime powder and the paint removal effect.

[0025] (3) The present invention can create a raised shape on the lower surface of the filter screen by the mutual cooperation between the push rod, the guide rod and the filter screen, so that when the spraying gas passes through the raised surface, it can obliquely blow the lime powder on the surface of the filter screen, improve the efficiency of the filter screen surface to remove lime powder, improve the flow rate of the filter screen during filtration, and thus improve the wind power circulation efficiency.

[0026] In summary, the present invention has advantages such as good filtration effect of circulating airflow during whole vehicle painting and good adsorption effect of lime powder on paint. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the wind power circulation device of the present invention;

[0029] Figure 3 This is an enlarged view of the structure of the wind power circulation device of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the powder-blasting component of the present invention;

[0031] Figure 5 For the present invention Figure 4 A sectional view;

[0032] Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle;

[0033] Figure 7 For the present invention Figure 5 Enlarged view of point A in the middle;

[0034] Figure 8 This is a schematic diagram of the structure of the filter assembly of the present invention;

[0035] Figure 9 This is a schematic diagram showing the structural fit between the filter screen, guide rod, and push assembly of the present invention;

[0036] Figure 10 For the present invention Figure 9 Enlarged view at point C;

[0037] Figure 11 This is a schematic diagram of the push rod structure of the present invention;

[0038] Figure 12 This is a schematic diagram showing the state of the spraying gas acting on the filter screen according to the present invention;

[0039] Figure 13 This is a flowchart of the spraying method of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Example

[0043] like Figure 1 and 2As shown, an automotive painting system includes: a painting chamber 1, with an air intake channel 11 at the bottom; and painting robots 2 distributed on both sides of the painting chamber 1. The system is characterized by further including: a wind circulation device 3, comprising: a paint filter assembly 31, which transports lime powder from top to bottom and arranges it in a dispersed state to treat the inhaled painting air. When the treated lime powder passes through the paint filter assembly 31 with the painting air, the paint filter assembly 31 forms a raised shape, causing the lime powder adhering to the paint filter assembly 31 to detach; a centralized filter assembly 32, installed above the paint filter assembly 31, which performs secondary filtration on the gas discharged from the paint filter assembly 31; and an exhaust assembly 33, installed above the centralized filter assembly 32, which provides suction power to the centralized filter assembly 32 and the paint filter assembly 31, and sends the exhaust air to the top of the painting chamber 1 for downward discharge.

[0044] From the above, it is easy to see that during the whole-vehicle painting process, the vehicle is placed in the spray booth 1, and the paint is sprayed onto the vehicle by the spraying robot arm 2. During the spraying process, the exhaust assembly 33 draws in the recirculated air that has been filtered by the paint filter assembly 31 and the centralized filter assembly 32, and blows it out from the top of the spray booth 1. At the same time, it is drawn back through the bottom air intake channel 11 of the spray booth 1, filtered again by the paint filter assembly 31, and then filtered a second time by the centralized filter assembly 32 to obtain the recirculated spraying air. During the filtration process of the paint filter assembly 31, the lower surface of the paint filter assembly 31 continuously forms ridges, which allows the adsorbed lime powder to be obliquely blown along the ridged surface when the spraying air flows through it, thereby causing the lime powder to detach from the ridged surface (e.g., ...). Figure 12 As shown in the figure, this solves the technical problem of reduced air permeability caused by lime powder clogging the surface of the filter paint assembly 31 during the filtration process.

[0045] like Figure 1 As shown, the exhaust end of the exhaust assembly 33 is connected to an exhaust port 331 via a pipe, and the exhaust port 331 is located at the top center of the spraying chamber 1.

[0046] like Figure 3As shown, the paint filter assembly 31 includes: a housing 311, with an inlet channel 3111 on one side of the bottom of the housing 311, through which the spraying airflow is introduced from bottom to top; a filter screen assembly 312, which is arranged in a stepped manner from top to bottom within the housing 311; and a powder polishing assembly 313, which is correspondingly disposed below each of the filter screen assemblies 312, and throws lime powder onto the raised surface of the filter screen assembly 312. The falling lime powder falls to the other side below the filter screen assembly 312 and is conveyed to the next stepped powder polishing assembly 313 for polishing.

[0047] In this embodiment, during the filtration of the spraying gas entering through the air inlet channel 11, the paint filter assembly 31 enters through the inlet channel 3111, and the powder-spraying assembly 313 continuously lifts lime powder upwards to act on the spraying gas, so that the paint in the spraying gas is adsorbed by the dispersed lime powder. At the same time, the filtered spraying gas passes through each group of filter screen assemblies 312 from bottom to top, and before passing through the filter screen assembly 312, it is processed by the corresponding powder-spraying assembly 313 below, thereby achieving the filtration of the spraying gas.

[0048] like Figure 8 As shown, the filter assembly 312 includes: a filter 3121, the two ends of which are mounted on the housing 311; a guide rod 3122, which slides through both sides of the filter 3121 to guide the filter 3121 back and forth in a curved arrangement; and a pusher assembly 3123, which is connected to the guide rod 3122, and the contact surface between the pusher assembly 3123 and the filter 3121 corresponds to the curved shape.

[0049] In this embodiment, during the filtration of the spraying gas, the guide rod 3122 moves back and forth, thereby creating a curved shape on both sides of the filter screen 3121. At the same time, the pushing component 3123 pushes the upper surface of the filter screen 3121, causing the lower surface of the filter screen 3121 to bulge back and forth. As the spraying gas passes through, the airflow acts on the bulging surface, blowing away the lime powder particles adsorbed on the lower surface of the filter screen 3121.

[0050] like Figure 9 As shown, the guide rod 3122 includes: a straight guide rod 31221; and a curved guide rod 31222, the curved guide rod 31222 being connected to one end of the straight guide rod 31221, and the curved guide rod 31222 being wavy in shape.

[0051] In this embodiment, both the straight guide rod 31221 and the curved guide rod 31222 are arranged through both sides of the filter screen 3121. Thus, when the guide rod 3122 moves back and forth, the two sides of the filter screen 3121 can also be made into a curved shape corresponding to the curved guide rod 31222.

[0052] like Figure 10 As shown, the guiding assembly 3123 includes: a guiding bracket 31231; a guiding rod 31232, a plurality of the guiding rods 31232 being mounted on the guiding bracket 31231; and a guiding power component 31233, the power output end of the guiding power component 31233 being connected to the guiding bracket 31231; one end of the guide rod 3122 being mounted on the power output end of the guiding power component 31233.

[0053] In this embodiment, when the pusher assembly 3123 moves back and forth together with the guide rod 3122, the pusher rod 31232 will move back and forth on the upper surface of the filter screen 3121, and thus work together with the guide rod 3122 to create a raised surface on the filter screen 3121, so as to blow away the lime powder on the surface of the filter screen 3121.

[0054] like Figure 11 As shown, the push rod 31232 has a hollow structure, and the lower surface of the push rod 31232 is provided with an air jet 31234.

[0055] In this embodiment, the air jet 31234 can use an intermittent blowing method to act in the opposite direction on the surface of the filter screen 3121, so as to blow away the lime powder that is blocked on the filter screen 3121. Example

[0056] like Figure 4 and 5 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0057] The powder-dissolving assembly 313 includes: a powder-dissolving chamber 3131, which is located at the bottom of the housing 311; a powder-lifting roller 3132, which is installed inside the powder-dissolving chamber 3131 along its length; a powder-collecting chamber 3133, which is located on one side of the powder-dissolving chamber 3131; and a circulating powder-feeding assembly 3134, which guides the lime powder collected in the powder-collecting chamber 3133 to the powder-dissolving chamber 3131 of the next step.

[0058] In this embodiment, during the powder-spraying process, the powder-spraying component 313 continuously rotates the powder-lifting roller 3132 to lift up the lime powder in the powder-spraying chamber 3131. As the lime powder falls, it is obliquely moved by the airflow of the spraying gas and falls into the powder-collecting chamber 3133 on one side of the powder-spraying chamber 3131. It will then be transported to the next-level powder-spraying chamber 3131 by the circulating powder-feeding component 3134 to continue to absorb the spraying gas.

[0059] It is worth noting that by using the method of conveying lime powder from the upper level to the lower level powder chamber 3131, the utilization rate of lime powder can be guaranteed, while also ensuring the relative cleanliness of the lime powder in the upper level, so that it is in a relatively clean state when passing through the centralized filter component 32.

[0060] The centralized filtration assembly 32 is formed by multiple filtration layers.

[0061] like Figure 4-5 As shown in Figure 6, the circulating powder feeding assembly 3134 includes: a powder output screw 31341, which is installed at the lower end of the powder receiving chamber 3133; a powder input screw 31342, which is installed on one side of the powder throwing chamber 3131 to input lime powder into the powder throwing chamber 3131; and a guiding assembly 31343, which is located on the outside of the housing 311 to transport the lime powder in the powder output screw 31341 of the previous step to the powder input screw 31342 of the next step.

[0062] The guiding assembly 31343 includes a guiding housing and a guiding screw installed inside the guiding housing.

[0063] like Figure 7 As shown, the housing 311 includes an air intake duct opened on one side of the powder-discharging chamber 3131; the air intake duct connects the lower part of the filter assembly 312 of the previous step to the top of the filter assembly 312 of the next step.

[0064] In this embodiment, the air inlet 312 facilitates the passage of spraying air and solves the problem of backflow when lime powder is thrown up and falls through the air inlet 312. Example

[0065] like Figure 13 As shown, a method for painting an entire automobile vehicle includes the following steps:

[0066] Step 1: Drain the spraying air. The exhaust assembly 33 blows air out from the top of the spraying chamber 1, guiding the spraying air generated by the spraying robot 2 into the air intake channel 11.

[0067] Step 2: Powdering to remove paint. The spraying air enters the inlet channel 3111 through the air inlet channel 11 and passes through the stepped filter screen 3121 in sequence. When passing through the filter screen 3121, the powder-spraying roller 3132 throws the lime powder in the powder-spraying chamber 3131 toward the bottom side of the filter screen 3121 and combines with the spraying air to absorb the paint.

[0068] Step 3: Circulating downward material movement. As the lime powder is pushed down by the airflow of the spraying air, it falls into the powder collection chamber 3133, is discharged through the powder output screw 31341, and is guided by the guide assembly 31343 to the powder input screw 31342 of the next step. It is then discharged into the corresponding powder throwing chamber 3131 through the powder input screw 31342 until it falls into the bottom set of powder throwing chambers 3131 and is discharged and collected through the powder output screw 31341.

[0069] Step 4: Cleaning the screen. During the process of step 2, the pusher 31233 simultaneously drives the guide rod 3122 and the pusher rod 31232 to move back and forth on the filter screen 3121, so that the raised shape on the lower surface of the filter screen 3121 is in a moving state. Under the action of the airflow force of the spraying air, the lime powder adhering to the surface of the raised filter screen 3121 is blown down obliquely along the raised direction.

[0070] Step 5: Secondary filtration. After the airflow is treated by the paint filter assembly 31, it is filtered a second time by the centralized filter assembly 32. The exhaust assembly 33 then circulates the filtered airflow and discharges it from the top of the spray booth 1.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vehicle painting system, comprising: Spraying chamber (1), with an air inlet channel (11) at the bottom of the spraying chamber (1); A spraying robot (2) is distributed on both sides of the spraying chamber (1); Its characteristic is that it further includes: Wind power circulation device (3), the wind power circulation device (3) includes: The paint filter assembly (31) conveys lime powder from top to bottom and arranges it in a dispersed state to treat the inhaled spraying gas. When the treated lime powder passes through the paint filter assembly (31) with the spraying gas, the paint filter assembly (31) forms a raised shape, so that the lime powder adhering to the paint filter assembly (31) is removed. A centralized filtration assembly (32), installed above the paint filter assembly (31), performs secondary filtration on the gas discharged from the paint filter assembly (31); and An exhaust assembly (33) is installed above the centralized filter assembly (32) to provide suction power to the centralized filter assembly (32) and the paint filter assembly (31) and send it to the top of the spray booth (1) for downward discharge; The paint filter assembly (31) includes: The housing (311) has an inlet channel (3111) on one side of its bottom, and the housing (311) introduces the spraying airflow from bottom to top; A filter assembly (312) is arranged in a stepped manner from top to bottom inside the housing (311); The powder-throwing component (313) is disposed below each of the filter screen components (312) to throw lime powder onto the raised surface of the filter screen component (312). The falling lime powder falls to the other side below the filter screen component (312) and is conveyed to the powder-throwing component (313) of the next step for powder-throwing. The filter assembly (312) includes: A filter screen (3121) is mounted on the housing (311) at both ends; A guide rod (3122) slides through both sides of the filter screen (3121), guiding the two sides of the filter screen (3121) back and forth in a curved arrangement; and A guide assembly (3123) is connected to the guide rod (3122), and the contact surface between the guide assembly (3123) and the filter screen (3121) corresponds to the curved shape. The guide rod (3122) includes: Linear guide rod (31221); and A curved guide rod (31222) is connected to one end of the straight guide rod (31221), and the curved guide rod (31222) is wavy in shape; The derivation component (3123) includes: Derivation bracket (31231); A push rod (31232), a plurality of sets of said push rods (31232) are mounted on said push bracket (31231); and A propulsion power component (31233) is provided, wherein the power output end of the propulsion power component (31233) is connected to the propulsion support (31231); One end of the guide rod (3122) is installed at the power output end of the pushing power component (31233).

2. The automotive whole-vehicle painting system according to claim 1, characterized in that, The push rod (31232) has a hollow structure, and the lower surface of the push rod (31232) is provided with an air jet (31234).

3. The automotive whole-vehicle painting system according to claim 2, characterized in that, The powder-dissolving assembly (313) includes: A powder-dissolving chamber (3131) is provided at the bottom of the housing (311); A powder-lifting roller (3132) is installed inside the powder-throwing chamber (3131) along the length of the powder-throwing chamber (3131); A powder collection chamber (3133) is located on one side of the powder dispersing chamber (3131); and The circulating powder feeding assembly (3134) guides the lime powder collected in the powder receiving chamber (3133) to the powder throwing chamber (3131) of the next step.

4. The automotive whole-vehicle painting system according to claim 3, characterized in that, The circulating powder feeding assembly (3134) includes: A powder output screw (31341) is installed at the lower end of the powder collection chamber (3133); A powder input screw (31342) is installed on one side of the powder blasting chamber (3131) to input lime powder into the powder blasting chamber (3131); and A conveying assembly (31343) is located on the outside of the housing (311) to convey the lime powder in the powder output screw (31341) of the previous step to the powder input screw (31342) of the next step.

5. The automotive whole-vehicle painting system according to claim 4, characterized in that, The housing (311) includes an air intake duct opened on one side of the powder dispersing chamber (3131); the air intake duct connects the lower part of the filter assembly (312) of the previous step to the top of the filter assembly (312) of the next step.

6. A method for filtering spray gases in an automotive painting system according to claim 5, characterized in that, Includes the following steps: Step 1: Drain the spraying air. The exhaust assembly (33) blows the air out from the top of the spraying chamber (1) and guides the spraying air generated by the spraying robot (2) into the air intake channel (11). Step 2: Powdering to remove paint. The spraying air enters the inlet channel (3111) through the air inlet channel (11) and passes through the stepped filter screen (3121) in sequence. When passing through the filter screen (3121), the powder-raising roller (3132) throws the lime powder in the powder-spraying chamber (3131) toward the bottom side of the filter screen (3121) and combines with the spraying air to absorb the paint. Step 3: Circulating downward material transfer. When the lime powder is pushed down by the airflow of the spraying air, it falls into the powder collection chamber (3133), is discharged by the powder output screw (31341), and is guided by the guide assembly (31343) to the powder input screw (31342) of the next step. It is then discharged into the corresponding powder throwing chamber (3131) through the powder input screw (31342) until it falls into the powder throwing chamber (3131) of the bottom group and is discharged and collected through the powder output screw (31341). Step 4: Cleaning the screen. During the process of step 2, the pusher (31233) simultaneously drives the guide rod (3122) and the pusher rod (31232) to move back and forth on the filter screen (3121), so that the raised shape on the lower surface of the filter screen (3121) is in a moving state. Under the action of the airflow force of the spraying air, the lime powder adhering to the surface of the raised filter screen (3121) is blown down obliquely along the raised direction. Step 5: Secondary filtration. After the airflow is treated by the paint filter assembly (31), it is filtered a second time by the centralized filter assembly (32). The exhaust assembly (33) then circulates the filtered airflow from the top of the spray booth (1).

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