Anti-backflow device for glass surface coating production lines

Abstract

This invention relates to an anti-backflow device for a glass surface coating production line. It prevents contamination of non-coated areas of the glass during the coating process. The device includes a shielding fixture positioned below the glass. The shielding fixture moves vertically relative to the glass to a predetermined distance to shield the non-coated areas on the bottom surface of the glass. The shielding fixture has vents for injecting compressed air. Compressed air is injected through these vents into the space between the shielding fixture and the non-coated areas of the glass to disperse paint mist scattered between them. This invention solves the technical problem of non-coated surfaces being easily contaminated by the coating liquid during glass coating.

Description

Technical Field

[0001] This invention relates to the field of glass manufacturing, and more particularly to an anti-backflow device for a glass surface spraying production line, and especially to an anti-backflow device for a spraying production line for producing automotive glass surfaces. Background Technology

[0002] With technological advancements, functional coating technology for glass surfaces has been developed and is being used in mass production. However, during the operation of these production lines, a back-spraying phenomenon has been observed. Specifically, the paint mist from the spraying process floats to areas of the glass that do not require coating (such as the other side of the glass), forming scattered spots in these areas. This results in an unsightly appearance of the coated glass, affecting its aesthetics and usability. Therefore, after the glass is coated using the production line, manual polishing is required to remove the back-spray spots. However, polishing has the following drawbacks:

[0003] First, manual labor is inefficient, labor-intensive, and difficult to clean completely.

[0004] Second, manual operation involves many uncertainties, which makes product quality uncontrollable and can easily lead to glass scratches and other issues.

[0005] Currently, a masking plate can be used during the spraying process. Positioning the masking plate below and close to the glass during spraying effectively blocks areas that don't need to be sprayed. However, during continuous spraying, spray liquid accumulates on the masking plate and its edges. As the amount of accumulated spray liquid increases, it may transfer to the unsprayed areas of the next piece of glass during subsequent masking processes, still causing contamination and requiring the aforementioned polishing and cleaning processes.

[0006] There is currently no effective solution to the problem that non-sprayed surfaces are easily contaminated by the spraying liquid during the glass spraying process in related technologies.

[0007] Therefore, based on years of experience and practice in related industries, the inventor proposes an anti-backflow device for glass surface coating production lines to overcome the shortcomings of existing technologies. Summary of the Invention

[0008] The purpose of this invention is to provide an anti-backflow device for a glass surface spraying production line, which can effectively prevent backflow during the glass spraying process, improve the surface spraying quality of the glass, eliminate the need for polishing after spraying, and improve production efficiency.

[0009] The objective of this invention can be achieved through the following methods:

[0010] This invention provides an anti-backflow device for a glass surface coating production line, which is used to prevent contamination of non-coated areas of the glass during the glass coating process. The anti-backflow device for the glass surface coating production line includes:

[0011] A masking fixture is disposed below the glass. The masking fixture moves up and down relative to the glass to a preset distance to mask the non-coated area on the bottom surface of the glass. The masking fixture has air holes for spraying compressed air. The compressed air is sprayed through the air holes into the space between the masking fixture and the non-coated area of ​​the glass to disperse the paint mist scattered between the masking fixture and the non-coated area of ​​the glass.

[0012] In a preferred embodiment of the present invention, the shielding fixture is plate-shaped and adapted to the glass, the shielding fixture is arranged in a horizontal direction, and an annular protrusion is provided on the top surface of the shielding fixture along its edge.

[0013] In a preferred embodiment of the present invention, the inner and outer sides of the boss have annular first recess and second recess, respectively.

[0014] In a preferred embodiment of the present invention, the height of the top surface of the boss relative to the first recess is not less than 1-15 mm; and / or

[0015] The height of the top surface of the boss relative to the second recess is not less than 1-10 mm.

[0016] In a preferred embodiment of the present invention, the width of the second recess is 1-10 mm; and / or

[0017] The width of the boss is 1-100mm.

[0018] In a preferred embodiment of the present invention, the connection position between the boss and the first recess is chamfered.

[0019] In a preferred embodiment of the present invention, the top surface of the boss matches the bottom surface of the glass at its opposite position, so that the vertical distance between any position of the top surface of the boss and the bottom surface of the glass is the same.

[0020] In a preferred embodiment of the present invention, a diverter cap is provided above the air hole to prevent compressed air from blowing directly onto the glass. The projection of the diverter cap on the shielding fixture covers the air hole, and the diverter cap is connected to the top surface of the shielding fixture through multiple legs.

[0021] In a preferred embodiment of the present invention, the height of the diverter cap is less than the height of the top surface of the boss.

[0022] In a preferred embodiment of the present invention, the projected area of ​​the diverter cap on the shielding fixture is 1-3 times the area of ​​the vent.

[0023] In a preferred embodiment of the present invention, the anti-backflow device for the glass surface spraying production line further includes an air jet assembly, the air jet assembly including an air supply pipeline, the air inlet of the air supply pipeline being connected to a compressed air source, and the air outlet of the air supply pipeline being connected to the air hole.

[0024] In a preferred embodiment of the present invention, a pressure regulating valve is provided on the air supply pipeline to adjust the flow rate of the compressed air injected from the air hole to be at least 0.5-2 times the falling speed of the paint mist.

[0025] In a preferred embodiment of the present invention, the pressure regulating valve is capable of adjusting the pressure of the compressed air injected by the air hole to 0.001-0.2 MPa.

[0026] In a preferred embodiment of the present invention, the pressure regulating valve can adjust the flow rate of compressed air so that the pressure difference between the shielding fixture and the glass and the external environment is 1-10 Pa.

[0027] In a preferred embodiment of the present invention, the air hole is located in the middle or near the middle of the shielding fixture, and an air inlet connector for connecting to the air supply pipeline is provided at the air hole.

[0028] In a preferred embodiment of the present invention, the pore diameter is 4-10 mm.

[0029] In a preferred embodiment of the present invention, the anti-backflow device for a glass surface coating production line further includes a first lifting support mechanism, which comprises a first lifting component and a first support component.

[0030] The first lifting assembly includes a first driving device and a vertically arranged first connecting column, the bottom end of which is connected to the driving end of the first driving device.

[0031] The first support assembly includes a first support plate and a plurality of vertically arranged first support rods. The top end of the first connecting column is connected to the bottom surface of the first support plate, the bottom ends of the plurality of first support rods are respectively connected to the top surface of the first support plate, and the top ends of the plurality of first support rods are respectively provided with first suction cups for adsorbing and fixing the glass.

[0032] In a preferred embodiment of the present invention, the anti-backflow device for a glass surface coating production line further includes a second lifting support mechanism, which comprises a second lifting component and a second support component.

[0033] The second lifting assembly includes a second driving device and a vertically arranged second connecting column, the bottom end of which is connected to the driving end of the second driving device;

[0034] The second support assembly includes a second support plate and a plurality of vertically arranged second support rods. The top end of the second connecting column is connected to the bottom surface of the second support plate, and the bottom ends of the plurality of second support rods are respectively connected to the top surface of the second support plate. The top ends of the plurality of second support rods are respectively provided with second suction cups for adsorbing and fixing the shielding fixture.

[0035] In a preferred embodiment of the present invention, at least a portion of the gas pipeline is disposed inside the second connecting column.

[0036] In a preferred embodiment of the present invention, the anti-backflow device for the glass surface spraying production line further includes a base with an internal chamber, the base being fixed on the spraying station, and the shielding fixture and the glass being located above the base.

[0037] In a preferred embodiment of the present invention, the preset distance is 1-5mm.

[0038] In a preferred embodiment of the present invention, the surface of the shielding fixture is provided with a hydrophobic layer, which is formed by spraying a hydrophobic agent onto the surface of the shielding fixture.

[0039] In a preferred embodiment of the present invention, the surface of the shielding fixture is activated, and the activation treatment includes plasma treatment or flame treatment.

[0040] As described above, the features and advantages of the anti-backflow device for a glass surface coating production line of the present invention are as follows: a shielding fixture is provided below the glass to be coated, and the shielding fixture and the glass can move relative to each other vertically. Before painting, the shielding fixture can be moved up and down relative to the glass to a preset distance, thereby shielding the non-coated areas of the glass and preventing paint from splashing and contaminating the glass during painting. In addition, the shielding fixture is provided with air holes for spraying compressed air, and the compressed air is sprayed through the air holes onto the non-coated areas of the glass between the shielding fixture and the glass. The paint mist is dispersed between the spraying areas and between the masking fixture and the non-sprayed areas of the glass, thus preventing the paint mist from drifting into the non-sprayed areas of the glass and causing contamination, and also preventing the paint mist from drifting and accumulating at the edges of the masking fixture to a certain height and then contacting the non-sprayed areas of the glass, thus preventing contamination. Therefore, this invention can effectively prevent back spraying during the glass spraying production process, improve the surface coating quality of the glass, eliminate the need for polishing and grinding the glass after spraying, reduce the labor intensity of workers, and improve production efficiency. Attached Figure Description

[0041] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0042] in:

[0043] Figure 1 This is a schematic diagram of the anti-backflow device for a glass surface coating production line according to the present invention.

[0044] Figure 2 This is a schematic diagram of the first lifting support mechanism in the anti-backflow device for a glass surface spraying production line of the present invention.

[0045] Figure 3 This is a schematic diagram of the second lifting support mechanism in the anti-backflow device for a glass surface spraying production line of the present invention.

[0046] Figure 4 This is a schematic diagram of the shielding fixture in the anti-backflow device for a glass surface spraying production line according to the present invention.

[0047] Figure 5 This is a partially enlarged view of the edge position of the shielding fixture in the anti-backflow device of the glass surface spraying production line of the present invention.

[0048] Figure 6 This is a partial enlarged view of the location of the flow divider cap of the shielding fixture in the anti-backflow device of the glass surface spraying production line of the present invention.

[0049] The reference numerals in the accompanying drawings of this invention are:

[0050] 1. Base; 101. Chamber;

[0051] 2. First lifting support mechanism; 201. First lifting assembly;

[0052] 2011, First driving device; 2012, First connecting column;

[0053] 202. First support component; 2021. First support plate;

[0054] 2022, First support rod; 2023, First suction cup;

[0055] 3. Second lifting support mechanism; 301. Second lifting assembly;

[0056] 3011. Second drive unit; 3012. Second connecting column;

[0057] 302. Second support component; 3021. Second support plate;

[0058] 3022, Second support rod; 3023, Second suction cup;

[0059] 303. Jet assembly; 3031. Gas pipeline;

[0060] 3032. Pressure regulating valve; 4. Shielding fixture;

[0061] 401. Boss; 4011. Second recess;

[0062] 4012. First recess; 402. Through hole;

[0063] 403. Diverter cap; 404. Support leg;

[0064] 405. Pores; 5. Glass. Detailed Implementation

[0065] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0066] like Figures 1 to 6As shown, the present invention provides an anti-backflow device for a glass surface coating production line, which is used to prevent the non-coated areas of glass 5 from being contaminated during the painting process. The anti-backflow device for the glass surface coating production line includes a shielding fixture 4, which is disposed below the glass 5. The shielding fixture 4 and / or the glass 5 are movable vertically, allowing the shielding fixture 4 to be moved vertically relative to the glass 5 to a preset distance to shield the non-coated areas (i.e., the non-coated surfaces) of the bottom surface of the glass 5. The shielding fixture 4 has air holes 405 for injecting compressed air. Compressed air is injected through the air holes 405 between the shielding fixture 4 and the non-coated areas of the glass 5 to disperse the paint mist scattered between them.

[0067] In this invention, spraying refers to applying a functional coating to the surface of glass 5, and the type of paint is not limited.

[0068] This invention provides a masking fixture 4 positioned below the glass 5 to be painted. The masking fixture 4 and the glass 5 are vertically movable relative to each other. Before painting, the masking fixture 4 can be moved vertically relative to the glass 5 to a preset distance, thereby shielding the non-painted areas of the glass 5 and preventing paint splattering and contamination during painting. Furthermore, the masking fixture 4 is equipped with air holes 405 for injecting compressed air. Compressed air is injected through the air holes 405 into the area between the masking fixture 4 and the non-painted area of ​​the glass 5, thereby dispersing the splatter. The paint mist that falls between the masking fixture 4 and the non-coated area of ​​the glass 5 prevents it from drifting into the non-coated area of ​​the glass 5 and contaminating it, and also prevents the paint mist from drifting and accumulating at the edge of the masking fixture 4 to a certain height and then contacting the non-coated area of ​​the glass 5, thus preventing contamination. Therefore, this invention can effectively prevent backspray during the glass 5 coating process, improve the surface coating quality of the glass 5, eliminate the need for polishing after coating, reduce the labor intensity of workers, and improve production efficiency. The glass 5 can be, but is not limited to, automotive glass.

[0069] In an optional embodiment of the present invention, such as Figures 1 to 4 As shown, the masking fixture 4 is a plate-shaped structure adapted to fit the glass 5. The masking fixture 4 is arranged horizontally, and an annular protrusion 401 is provided on the top surface of the masking fixture 4 along its edge. During the painting process, paint mist will drift from the outside towards the area between the masking fixture 4 and the glass 5. Therefore, a large amount of paint will accumulate at the edge of the masking fixture 4. Thus, the protrusion 401 can intercept the paint mist drifting between the masking fixture 4 and the glass 5, thereby preventing contamination.

[0070] Furthermore, such as Figure 4 , Figure 5As shown, the inner side of the boss 401 has an annular first recess 4012, and the outer sides of the boss 401 have annular second recesses 4011. Paint blocked outside the boss 401 will accumulate in the second recesses 4011 and fall outwards towards the outside of the shielding fixture 4 as the accumulation increases, thus preventing the paint from contacting the glass 5 after accumulating to a certain height.

[0071] Furthermore, the connection position between the boss 401 and the first recess 4012 is chamfered (or streamlined). When paint accumulates on the boss 401, the chamfered structure can guide the paint into the first recess 4012, thus avoiding the accumulation of paint on the boss 401.

[0072] Furthermore, the depth of the first recess 4012 can be, but is not limited to, 1-15 mm, and the depth of the second recess 4011 can be, but is not limited to, 1-10 mm. Specifically, the depth of the first recess 4012 can be one of 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, and 15 mm. Specifically, the depth of the second recess 4011 can be one of 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, and 10 mm.

[0073] Furthermore, the width of the second recess 4011 can be, but is not limited to, 1-10 mm, and the width of the boss 401 can be, but is not limited to, 1-100 mm. Specifically, the width of the second recess can be one of 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, and 10 mm. Specifically, the width of the boss 401 can be one of 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, and 100 mm.

[0074] In an optional embodiment of the present invention, the top surface of the boss 401 matches the bottom surface of the glass 5 at its opposite position, so that the vertical distance between any position of the top surface of the boss 401 and the bottom surface of the glass 5 is the same. That is, it is necessary to ensure that the interval distance between each position of the top surface of the boss 401 and the bottom surface of the glass 5 is consistent. This can ensure that the compressed air jet velocity is consistent at each position, and also prevent the glass 5 from being contaminated by a small amount of paint accumulating on the top of the boss 401 due to the small interval distance at some positions.

[0075] In an optional embodiment of the present invention, such as Figure 4 , Figure 6As shown, a diverter cap 403 is provided above the vent 405 to prevent compressed air from directly blowing onto the glass 5. The diverter cap 403 is disc-shaped, and its projection on the masking fixture 4 covers the vent 405. The diverter cap 403 is connected to the top surface of the masking fixture 4 via multiple legs 404. The multiple legs 404 are spaced apart circumferentially along the diverter cap 403. The top ends of the multiple legs 404 are connected to the edges of the diverter cap 403, and the bottom ends of the multiple legs 404 are connected to the top surface of the masking fixture 4, thus providing support and fixation for the diverter cap 403. The compressed air ejected from the vent 405 enters from the gap between two adjacent legs 404 into the non-coating area between the masking fixture 4 and the glass 5, thereby preventing the compressed air from directly acting on the glass 5 to be coated and causing the glass 5 to move.

[0076] Furthermore, the projected area of ​​the flow divider cap 403 on the masking fixture 4 is 1-3 times the area of ​​the vent 405, further ensuring that compressed air does not directly act on the glass 5 to be sprayed, effectively ensuring that the spraying of compressed air will not cause the glass 5 to move, and ensuring the stable operation of the glass 5 spraying work. Specifically, the projected area of ​​the flow divider cap 403 on the masking fixture 4 is 1-3 times the area of ​​the vent 405, and further, the projected area of ​​the flow divider cap 403 on the masking fixture 4 can be one of 1, 1.5, 2, 2.5, or 3 times the area of ​​the vent 405.

[0077] Furthermore, the height of the diverter cap 403 is less than the height of the top surface of the boss 401. Specifically, the height of the top surface of the boss 401 relative to the first recess 4012 is not less than 1-15mm, and the height of the top surface of the boss 401 relative to the second recess 4011 is not less than 1-10mm. This ensures that the diverter cap 403 can be installed smoothly and stably after installation, preventing the diverter cap 403 from affecting the normal spraying of the glass 5 above. Specifically, the height of the top surface of the boss 401 relative to the first recess 4012 can be one of 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, and 15mm. Similarly, the height of the top surface of the boss 401 relative to the second recess 4011 can be one of 1mm, 3mm, 5mm, 7mm, 9mm, and 10mm.

[0078] Furthermore, it is necessary to ensure that the size and shape of the masking fixture 4 are compatible with the size and shape of the glass 5. Specifically, the size and shape of the masking fixture 4 can be set to be the same as the size and shape of the glass 5, or the size and shape of the masking fixture 4 can be set to be the same as the shape of the glass 5, and the size of the masking fixture 4 is 2-10mm smaller than the size of the glass 5, so as to ensure that the masking fixture 4 can effectively mask the non-coated areas of the glass 5.

[0079] In an optional embodiment of the present invention, such as Figure 1 , Figure 3 As shown, the anti-backflow device for the glass surface spraying production line also includes an air jet assembly 303. The air jet assembly 303 includes an air supply pipe 3031. The air inlet of the air supply pipe 3031 is connected to an external compressed air source, and the air outlet of the air supply pipe 3031 is connected to an air hole 405. The compressed air supplied by the air supply pipe 3031 is ejected through the air hole 405 to disperse the paint mist scattered between the non-spraying area of ​​the shielding fixture 4 and the glass 5.

[0080] In an optional embodiment of the present invention, such as Figure 1 , Figure 3 As shown, a pressure regulating valve 3032 is installed on the air supply pipeline 3031. The pressure regulating valve 3032 can adjust the flow rate of the compressed air injected from the air hole 405 to ensure that the flow rate of the compressed air is at least 0.5-2 times the falling speed of the paint mist. Its effects are: 1. It can reduce paint adsorption onto the masking fixture 4; 2. It can prevent paint accumulating on the edge of the masking fixture 4 from exceeding the highest point of the edge of the masking fixture 4 (i.e., the top surface of the boss 401); 3. It prevents the outward overflow speed of the compressed air between the masking fixture 4 and the glass 5 from being too low, causing the paint mist to still drift to the edge of the non-coated surface of the glass 5; 4. It prevents the outward overflow speed of the compressed air between the masking fixture 4 and the glass 5 from being too high, resulting in the paint mist dispersing slowly in the environment and causing the paint mist to drift to the non-coated surface of the next piece of glass 5, causing contamination of the next piece of glass 5.

[0081] Furthermore, the pressure of the compressed air injected through the air port 405 can be adjusted to 0.001-0.2 MPa via the pressure regulating valve 3032. Specifically, the compressed air pressure can be one of 0.001 MPa, 0.01 MPa, 0.05 MPa, 0.07 MPa, 0.09 MPa, 0.1 MPa, 0.12 MPa, 0.14 MPa, 0.16 MPa, 0.18 MPa, and 0.2 MPa. The higher the adjustment precision of the pressure regulating valve 3032, the more stable the compressed air output. Preferably, the compressed air pressure is 0.001 MPa.

[0082] Furthermore, the flow rate of compressed air is adjusted by the pressure regulating valve 3032 to ensure that the pressure difference between the masking fixture 4 and the glass 5 and the external environment is 1-10 Pa. Specifically, the pressure difference between the masking fixture 4 and the glass 5 and the external environment can be one of 1 Pa, 3 Pa, 5 Pa, 7 Pa, 9 Pa, and 10 Pa. This avoids the paint adsorbing onto the masking fixture 4 due to too small a pressure difference, while also preventing paint mist from polluting the working environment due to too high a pressure (e.g., paint mist being blown onto the walls of the spray booth), and also avoids contamination of the non-sprayed surface of the next piece of glass 5.

[0083] In an optional embodiment of the present invention, such as Figure 4 As shown, the air inlet 405 is located in the middle or near the middle of the shielding fixture 4, and an air inlet connector for connecting to the air supply line 3031 is provided at the air inlet 405. The position of the air inlet 405 ensures that the compressed air injected by the air inlet 405 flows uniformly in all directions. The diameter of the air inlet 405 can be, but is not limited to, 4-10 mm. Specifically, the diameter of the air inlet 405 can be one of 4 mm, 6 mm, 8 mm, and 10 mm.

[0084] In an optional embodiment of the present invention, such as Figure 1 , Figure 2 As shown, the anti-backflow device for the glass surface spraying production line also includes a first lifting support mechanism 2. The first lifting support mechanism 2 includes a first lifting component 201 and a first support component 202. The first lifting component 201 includes a first driving device 2011 and a vertically arranged first connecting column 2012. The bottom end of the first connecting column 2012 is connected to the driving end of the first driving device 2011. The first support component 202 includes a first support plate 2021 and multiple vertically arranged first support rods 2022. The top end of the first connecting column 2012 is connected to the middle position of the bottom surface of the first support plate 2021. The multiple first support rods 2022 are respectively arranged at each top corner of the glass 5. The bottom ends of the multiple first support rods 2022 are respectively connected to the top surface of the first support plate 2021. The top ends of the multiple first support rods 2022 are respectively provided with first suction cups 2023. The bottom surface of the glass 5 can be adsorbed by the first suction cups 2023, thereby adsorbing and fixing the glass 5 to the top of the first lifting support mechanism 2. Among them, the glass 5 in the fixed state has a top surface that is coated and a bottom surface that is not coated.

[0085] In an optional embodiment of the present invention, such as Figure 1 , Figure 3As shown, the anti-backflow device for the glass surface spraying production line also includes a second lifting support mechanism 3. The second lifting support mechanism 3 includes a second lifting component 301 and a second support component 302. The second lifting component 301 includes a second driving device 3011 and a vertically arranged second connecting column 3012. The bottom end of the second connecting column 3012 is connected to the driving end of the second driving device 3011. The second support component 302 includes a second support plate 3021 and multiple vertically arranged second support rods 3022. The top of the second connecting column 3012 is connected to the bottom surface of the second support plate 3021. Multiple second support rods 3022 are respectively arranged at the top corners of the shielding fixture 4. The bottom ends of the multiple second support rods 3022 are respectively connected to the top surface of the second support plate 3021. The tops of the multiple second support rods 3022 are respectively provided with second suction cups 3023. The bottom surface of the shielding fixture 4 can be adsorbed through the second suction cups 3023, thereby adsorbing and fixing the shielding fixture 4 to the top of the second lifting support mechanism 3. Figure 1 , Figure 4 As shown, to ensure that the glass 5 is located below the shielding fixture 4, through holes 402 are respectively provided on the shielding fixture 4 at positions opposite to the multiple first support rods 2022. This allows the multiple first support rods 2022 to pass through the corresponding through holes 402 from bottom to top and extend into the shielding fixture 4, thereby adsorbing and fixing the glass 5. The diameter of the through holes 402 is 2-10 mm larger than the diameter of the first support rods 2022, and is close to the diameter of the glass 5 relative to the shielding fixture 4, thus ensuring more uniform airflow.

[0086] Furthermore, both the first drive device 2011 and the second drive device 3011 can be, but are not limited to, cylinders or hydraulic cylinders.

[0087] Furthermore, such as Figure 1 , Figure 4 As shown, at least a portion of the gas supply line 3031 (which may be the portion of the gas supply line 3031 located upstream of the pressure regulating valve 3032 in the direction of compressed air flow) is disposed inside the second connecting column 3012. This not only protects the gas supply line 3031 but also ensures the aesthetics of the device.

[0088] In an optional embodiment of the present invention, the preset distance (i.e., the vertical distance between the top surface of the masking fixture 4 and the bottom surface of the glass 5 in the spraying state) is 1-5 mm. Since if the top surface of the masking fixture 4 is attached to the bottom surface of the glass 5, the paint will accumulate at the edge of the masking fixture 4 and then be printed on the non-sprayed surface of the glass 5, in order to ensure that the non-sprayed surface of the glass 5 is not contaminated, it is necessary to form a channel for compressed gas to flow out between the top surface of the masking fixture 4 and the bottom surface of the glass 5 by setting the preset distance, thereby preventing paint from accumulating on the masking fixture 4 and causing contamination of the non-sprayed surface of the glass 5.

[0089] In an optional embodiment of the present invention, such as Figure 1 As shown, the anti-backflow device for the glass surface spraying production line also includes a base 1 with a chamber 101 formed inside. The base 1 is used to fix the spraying station. The shielding fixture 4 and the glass 5 are located above the base 1. The first drive device 2011 and the second drive device 3011 are disposed in the chamber 101. At least a part of the structure of the jet assembly 303 is located in the chamber 101.

[0090] In an optional embodiment of the present invention, a hydrophobic layer is provided on the surface of the masking fixture 4, which is formed by spraying an existing hydrophobic agent onto the surface of the masking fixture 4. By treating the surface of the masking fixture 4 (especially the surfaces of the boss 401 and the second recess 4011) with hydrophobicity, the fluidity of the paint on the surface of the masking fixture 4 is increased, making it easier to clean the masking fixture 4. At the same time, if there is paint accumulation at the locations of the boss 401 and the second recess 4011, it is easier to be blown off by compressed air, thereby achieving the purpose of preventing the glass 5 from being contaminated by paint.

[0091] In an optional embodiment of the present invention, the surface of the shielding fixture 4 may also undergo an activation treatment. The activation treatment may include plasma treatment or flame treatment. Preferably, the surface of the shielding fixture 4 has a dyne value greater than or equal to 60 after activation treatment.

[0092] In an optional embodiment of the present invention, the shielding fixture 4 is made of a lightweight material with pressure resistance. The material may include metal, plastic, or wood. The lighter the material used for the shielding fixture 4, the better, as it facilitates replacement. However, because the shielding fixture 4 needs to have a certain pressure resistance (withstanding 1 MPa of pressure without deformation), it needs a certain level of strength to ensure that it will not deform during use.

[0093] The production and assembly process of the shielding fixture 4 in the anti-backflow device for glass surface spraying production line of the present invention is as follows:

[0094] Step 1: Design the shape and size of the shielding fixture 4 based on the digital model of the glass to be shielded;

[0095] Step 2: Activate the surface of the masking fixture 4;

[0096] Step 3: Perform a water-repellent treatment on the surface of the masking fixture 4;

[0097] Step 4: Install the shielding fixture 4 on top of the second lifting support mechanism 3;

[0098] Step 5: Connect the air vent 405 on the shielding fixture 4 to an external compressed air source through the air supply pipe 3031.

[0099] The working process of the anti-backflow device for a glass surface spraying production line of the present invention is as follows: First, the base 1 is fixedly installed in the spraying booth of the automotive glass spraying production line. When the glass 5 is transported to the spraying station, the first connecting column 2012 of the first lifting support mechanism 2 moves upward by the drive of the first driving device 2011, thereby driving the first support plate 2021 to move upward. At this time, the glass 5 can be placed above the first support rod 2022 by the glass conveying robot (existing equipment) on the production line and fixed by adsorption by multiple first suction cups 2023. The robot can then leave. Afterwards, the second connecting column 3012 of the second lifting support mechanism 3 moves upward by the second drive... Driven by the actuator 3011, the second support plate 3021 moves upward, causing the shielding fixture 4, which is attached to the second support rod 3022, to approach the bottom surface (i.e., the non-spraying surface) of the glass 5. Then, the compressed air source is activated, and the flow rate of the compressed air is adjusted by the pressure regulating valve 3032, so that the compressed air is sprayed sequentially through the air supply pipe 3031 and the air hole 405 between the top surface of the shielding fixture 4 and the bottom surface of the glass 5. Then, the operator can operate the automatic spraying equipment (existing equipment) to spray the top surface (i.e., the spraying surface) of the glass 5. The bottom surface of the glass 5 is shielded by the shielding fixture 4 to avoid being contaminated by paint mist. After the spraying operation is completed, the intake of compressed air can be stopped. The masking fixture 4 moves downward through the second drive device 3011. Then, the glass conveying robot extends under the glass 5. The glass 5 moves downward through the first drive device 2011 until the glass 5 is carried on the glass conveying robot. Finally, the glass 5 is transferred by the glass conveying robot to the transfer roller on the production line for transport to the subsequent process.

[0100] The following are specific embodiments of the anti-backflow device for a glass surface coating production line according to the present invention:

[0101] A spraying experiment was conducted on glass 5 in a Class 1000 cleanroom. The clean air in the environment exhibited a downward laminar flow with a wind speed of 0.4-0.6 m / s. The minimum distance between the spray booth wall and the device of this invention and glass 5 was 1 m. After glass 5 entered the spray booth and the shielding fixture 4 was raised to the preset position, the opening of the pressure regulating valve 3032 was adjusted to control the injection speed of compressed air. An anemometer was used to detect the wind speed of the compressed air blown between the shielding fixture 4 and glass 5 at or near the edge of glass 5. After adjusting to the preset suitable wind speed, three pieces of glass 5 could be sprayed continuously. The self-cleaning time of the paint mist in the environment after spraying each piece of glass 5 was measured. After spraying, glass 5 underwent leveling and surface drying treatment according to the normal production process to ensure that the treated coating would not leave fingerprints when touched. Then, glass 5 was transported to the inspection table for appearance inspection. In this embodiment, the wind speed measurement can be performed using a TSI VelociCalc 9515 portable anemometer, which is placed on the outside of the gap between the shielding fixture 4 and the glass 5. The self-cleaning time test is started from the completion of spraying (paint dispensing stops). A green flashlight is used to illuminate the spraying chamber, and the time within the flashlight's beam path where no paint mist drifts is recorded as the cutoff time. The self-cleaning time in Table 1 is the average (rounded) of the self-cleaning times of three glass pieces 5 with the same parameters. For visual inspection, under a light intensity of 1000 Lx, with the light source 500-600 mm away from the glass 5, if paint mist is observed on the non-sprayed surface of one of the three glass pieces 5 with the same parameters, it is considered to have paint mist; otherwise, no paint mist is observed.

[0102] Table 1

[0103]

[0104] The following are comparative examples 1 to 4:

[0105] In Comparative Example 1, glass 5 and masking fixture 4 are in close contact, with no compressed air between them. Because the masking fixture 4 is approximately 5mm smaller than the glass 5, all paint mist adheres to the edges of the glass 5, and paint mist also adheres to the edges of the masking fixture 4. In Comparative Example 2, glass 5 and masking fixture 4 are in close contact, but compressed air is still injected between them. Compressed air still escapes through some small gaps between the glass 5 and the masking fixture 4, but in some areas (where the glass 5 and the masking fixture 4 are completely in contact), no compressed air escapes, resulting in… Paint mist is adsorbed on the non-coated surface of glass 5 opposite to this area; Comparative Example 3: A certain gap is reserved between glass 5 and masking fixture 4, but no compressed air is injected between glass 5 and masking fixture 4, so paint mist still drifts between glass 5 and masking fixture 4, resulting in paint mist adsorbing onto the non-coated surface of glass 5; Comparative Example 4: A certain gap is reserved between glass 5 and masking fixture 4, but the speed of compressed air injection between glass 5 and masking fixture 4 is too small, so paint mist still drifts between glass 5 and masking fixture 4, resulting in paint mist adsorbing onto the non-coated surface of glass 5. Specific parameters are shown in Table 2 below:

[0106] Table 2

[0107]

[0108]

[0109] The features and advantages of the anti-backflow device for glass surface spraying production line of the present invention are as follows:

[0110] The anti-backflow device for the glass surface spraying production line can effectively prevent backflow during the glass 5 spraying process, improve the surface spraying quality of glass 5, eliminate the need for polishing and grinding glass 5 after spraying, reduce the labor intensity of workers, and improve production efficiency.

[0111] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A backflow prevention device for a glass surface spraying production line, used to prevent contamination of non-sprayed areas of the glass during the glass spraying process, characterized in that, The anti-backflow device for the glass surface spraying production line includes: A masking fixture is disposed below the glass. The masking fixture moves up and down relative to the glass to a preset distance to mask the non-coated area on the bottom surface of the glass. The masking fixture has air holes for spraying compressed air. The compressed air is sprayed through the air holes into the space between the masking fixture and the non-coated area of ​​the glass to disperse the paint mist scattered between the masking fixture and the non-coated area of ​​the glass. The shielding fixture is plate-shaped and adapted to the glass. The shielding fixture is arranged in a horizontal direction. A ring-shaped protrusion is provided on the top surface of the shielding fixture along its edge to intercept the paint mist drifting between the shielding fixture and the glass. A diverter cap is provided above the air hole to prevent compressed air from blowing directly onto the glass. The projection of the diverter cap on the shielding fixture covers the air hole. The diverter cap is connected to the top surface of the shielding fixture through multiple legs. The multiple legs are distributed circumferentially along the diverter cap so that the compressed air enters between the shielding fixture and the glass from the gap between two adjacent legs.

2. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The boss has an annular first recess and a second recess on its inner and outer sides, respectively.

3. The anti-backflow device for a glass surface coating production line as described in claim 2, characterized in that, The height of the top surface of the boss relative to the first recess is not less than 1-15mm; and / or The height of the top surface of the boss relative to the second recess is not less than 1-10 mm.

4. The anti-backflow device for a glass surface coating production line as described in claim 2, characterized in that, The width of the second recess is 1-10 mm; and / or The width of the boss is 1-100mm.

5. The anti-backflow device for a glass surface coating production line as described in claim 2, characterized in that, The connection between the boss and the first recess is chamfered.

6. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The top surface of the boss matches the bottom surface of the glass at its opposite position, so that the vertical distance between any position of the top surface of the boss and the bottom surface of the glass is the same.

7. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The height of the diverter cap is less than the height of the top surface of the boss.

8. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The projected area of ​​the diverter cap on the shielding fixture is 1-3 times the area of ​​the vent.

9. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The anti-backflow device for the glass surface spraying production line also includes an air jet assembly, which includes an air supply pipeline. The air supply pipeline has an inlet for connecting to a compressed air source and an outlet for connecting to the air hole.

10. The anti-backflow device for a glass surface coating production line as described in claim 9, characterized in that, A pressure regulating valve is installed on the air supply pipeline to adjust the flow rate of the compressed air injected from the air hole to 0.5-2 times the falling speed of the paint mist.

11. The anti-backflow device for a glass surface coating production line as described in claim 10, characterized in that, The pressure regulating valve can adjust the pressure of the compressed air injected through the air hole to 0.001-0.2 MPa.

12. The anti-backflow device for a glass surface coating production line as described in claim 10, characterized in that, The pressure regulating valve can adjust the flow rate of compressed air so that the pressure difference between the shielding fixture and the glass and the external environment is 1-10 Pa.

13. The anti-backflow device for a glass surface coating production line as described in any one of claims 9-12, characterized in that, The air hole is located in the middle or near the middle of the shielding fixture, and an air inlet connector for connecting to the air supply pipeline is provided at the air hole.

14. The anti-backflow device for a glass surface coating production line as described in any one of claims 9-12, characterized in that, The pore diameter is 4-10 mm.

15. The anti-backflow device for a glass surface coating production line as described in any one of claims 9-12, characterized in that, The anti-backflow device for the glass surface coating production line further includes a first lifting support mechanism, which comprises a first lifting component and a first support component. The first lifting assembly includes a first driving device and a vertically arranged first connecting column, the bottom end of which is connected to the driving end of the first driving device. The first support assembly includes a first support plate and a plurality of vertically arranged first support rods. The top end of the first connecting column is connected to the bottom surface of the first support plate, the bottom ends of the plurality of first support rods are respectively connected to the top surface of the first support plate, and the top ends of the plurality of first support rods are respectively provided with first suction cups for adsorbing and fixing the glass.

16. The anti-backflow device for a glass surface coating production line as described in claim 15, characterized in that, The anti-backflow device for the glass surface coating production line further includes a second lifting support mechanism, which comprises a second lifting component and a second support component. The second lifting assembly includes a second driving device and a vertically arranged second connecting column, the bottom end of which is connected to the driving end of the second driving device; The second support assembly includes a second support plate and a plurality of vertically arranged second support rods. The top end of the second connecting column is connected to the bottom surface of the second support plate, and the bottom ends of the plurality of second support rods are respectively connected to the top surface of the second support plate. The top ends of the plurality of second support rods are respectively provided with second suction cups for adsorbing and fixing the shielding fixture.

17. The anti-backflow device for a glass surface coating production line as described in claim 16, characterized in that, At least a portion of the gas pipeline is located inside the second connecting column.

18. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The anti-backflow device for the glass surface spraying production line also includes a base with an internal chamber, the base being fixed to the spraying station, and the shielding fixture and the glass being located above the base.

19. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The preset distance is 1-5mm.

20. The anti-backflow device for a glass surface coating production line as described in claim 1, characterized in that, The surface of the shielding fixture is provided with a water-repellent layer, which is formed by spraying a water-repellent agent onto the surface of the shielding fixture.

21. The anti-backflow device for a glass surface coating production line as described in claim 20, characterized in that, The surface of the shielding fixture is activated, and the activation treatment includes plasma treatment or flame treatment.

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