A screen printing device based on pre-coated powder and its efficiency enhancement method

Abstract

The invention relates to the technical field of screen printing, and discloses a screen printing device based on pre-coated powder and a method for improving the efficiency thereof. The screen printing device based on pre-coated powder comprises a frame, a support frame is fixedly installed on one side of the top of the frame, a support beam is installed on the front side of the support frame for sliding up and down, a slide seat is installed on the support beam for horizontal sliding, a lifting seat is installed on the front side of the slide seat for sliding up and down, an ink return knife and a scraper are installed below the lifting seat, and a placement table for supporting a glass plate to be printed is arranged on the top of the frame; the invention pre-sprays a layer of powder on the glass plate, then uses screen printing technology to evenly distribute the powder on the surface of the product, and finally uses a scraper to tightly combine the powder with the product again, so as to achieve a gapless and high-quality printing effect. This technology can not only effectively process and print products with complex shapes, but also ensure the stability and durability of the pattern.

Description

Technical Field

[0001] The invention relates to the technical field of screen printing, in particular to a screen printing device based on pre-coated powder and a method for enhancing the efficiency thereof. Background Art

[0002] Screen printing machine is a kind of printing equipment widely used in various materials and industries. It transfers ink or coating to the substrate through the screen template, and is suitable for fine printing of flat or curved materials. This machine is divided into flat screen platform type, rotary screen platform type and drum (rotary) type, etc., with different technical characteristics and application ranges, such as high-precision image recognition, automatic operation, etc., which can meet the diversified needs of electronics, advertising, clothing, packaging and other industries. With the advancement of technology and the growth of market demand, screen printing machines are developing towards higher precision and efficiency.

[0003] Chinese patent CN110126450B discloses a screen printing machine, which includes a machine base, a dye box, a control panel, a printing table, a folding frame, a printing slide frame, and a circulating reflux scraping device. The machine base is a rectangular structure, the dye box is embedded in the machine base, the control panel is embedded in the front surface of the machine base, and the printing table is arranged on the upper surface of the machine base. The invention provides eight-shaped side plates on both sides of the scraping brush plate to prevent the dye from flowing to both sides and flowing to both sides of the printing table when the scraping brush plate is pushed forward. At the same time, the scraping brush plate and the side scraping plates are provided with a reflux structure, which cooperates with the rotation to return the dye collected by the previous group of scraping brush plates to the printing table, and the dye is returned for use in time to prevent the hardening and waste, and the printing table from being damaged during cleaning, so as to effectively save dye and protect printing equipment.

[0004] As shown in the above patent, the existing screen printing device generally places the dye on the screen, places the glass plate under the screen, moves the screen to make the screen fit the top wall of the glass plate, and then scrapes the dye through the screen holes to make the dye adhere to the glass plate, thereby realizing the printing transfer of the dye. However, this printing method is limited by the screen aperture and it is difficult to form a thicker dye layer. In particular, when the powder particles in the dye are large or the dye viscosity is high, it is easy to cause the screen to be blocked, thereby affecting the clarity and quality of printing.

[0005] Therefore, it is necessary to provide a screen printing device based on pre-coated powder and a method for enhancing the efficiency thereof to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a screen printing device based on pre-coated powder and its efficiency enhancement method, by pre-spraying a layer of powder on a glass plate, then using screen printing technology to evenly distribute the powder on the surface of the product, and finally using a scraper again to tightly combine the powder and the product, so as to achieve a gapless, high-quality printing effect.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a screen printing device based on pre-coated powder, comprising a frame, a support frame is fixedly installed on one side of the top of the frame, a support beam is installed on the front side of the support frame for sliding up and down, a slide seat is installed on the support beam for horizontal sliding, a lifting seat is installed on the front side of the slide seat for sliding up and down, and an ink return knife and a scraper are installed below the lifting seat, a placement table for supporting a glass plate to be printed is arranged on the top of the frame, a mounting frame for fixing the screen is arranged above the placement table, the mounting frame is fixedly connected to the support beam through a connecting frame, a spraying mechanism is arranged between the placement table and the mounting frame, the spraying mechanism is used to spray powder coating on the surface of the glass plate to be printed, the spraying mechanism comprises a support plate, a driving assembly and a mounting rod, the support plate is fixedly connected to the support frame, the mounting rod and the support plate are arranged perpendicular to each other, the driving assembly is arranged on the support plate, the driving assembly is transmission-connected to the mounting rod, and a plurality of nozzles are installed at the bottom end of the mounting rod.

[0008] The present invention is further configured as follows: the driving assembly includes a guide rail, a motor, a screw and a first slider, the guide rail is fixedly mounted on the top end of the support plate, the first slider is slidably mounted inside the guide rail, one end of the mounting rod is fixedly connected to the first slider, a screw is rotatably mounted inside the guide rail, the screw passes through the first slider, and the screw is threadedly connected to the first slider, the motor is fixedly mounted on one end of the guide rail, and the output end of the motor is fixedly connected to one end of the screw.

[0009] The present invention is further configured as follows: a mounting box is fixedly installed on one side of the end of the support plate, a damping shaft is rotatably installed inside the mounting box, a flexible belt is wound around the damping shaft, a through groove having the same shape as the pattern to be printed is provided on the flexible belt, an extension port is provided on one side of the mounting box, one end of the flexible belt extends out through the extension port, and a slide plate is fixedly connected to one end of the flexible belt, and a push plate is fixedly installed on the top of the slide plate.

[0010] The present invention is further configured as follows: a slide groove is provided on the front wall of the support plate, a second sliding block is slidably installed in the slide groove, and one end of the sliding block is fixedly connected to the second sliding block.

[0011] The present invention is further configured as follows: the top of the push plate is located on one side of the mounting rod, and when the mounting rod moves toward the motor, the mounting rod pushes the slide plate toward the motor through the push plate, and a locking assembly for locking the second slider is provided on one side of the support plate close to the motor, and when the second slider moves to the side of the slide groove close to the motor, the locking assembly locks the second slider.

[0012] The present invention is further configured as follows: the locking assembly includes a connecting box, a one-way card block and a traction rope, the connecting box is fixedly installed on the top side of the support plate close to the motor, a one-way card block is slidably installed inside the connecting box, an inclined surface is provided on the bottom side of the one-way card block away from the motor, the bottom of the one-way card block can be extended into the slide groove, the top of the one-way card block is fixedly connected to a spring, the top of the spring is fixedly connected to the top wall of the connecting box, and one end of the traction rope extends into the connecting box and is fixedly connected to the top wall of the one-way card block.

[0013] The present invention is further configured as follows: a limit rail is fixedly installed on the side of the front wall of the guide rail away from the motor, an adjustment plate is slidably installed on the limit rail, one end of the traction rope away from the connecting box is fixedly connected to the adjustment plate, and the top of the adjustment plate is located on one side of the mounting rod.

[0014] The present invention is further configured as follows: a mounting tube is fixedly mounted on one end of the mounting box, one end of the damping shaft extends into the mounting tube, a mainspring is sleeved on the end of the damping shaft, one end of the mainspring is fixedly connected to the damping shaft, and the other end of the mainspring is fixedly connected to the inner wall of the mounting box.

[0015] The present invention is further configured as follows: a scraper is fixedly installed at the bottom of the inner cavity of the installation box, the scraper is pressed on the top wall of the flexible belt, one end of the installation box is connected to an air inlet, and the other end of the installation box is connected to an air outlet.

[0016] The method for improving the printing effect by using the above-mentioned screen printing device based on pre-coated powder comprises the following steps:

[0017] S1. Before use, fix the screen in the installation frame and pour the colloid ink on the screen;

[0018] S2. When printing, place the glass plate on the placement table, and then drive the mounting rod to move horizontally through the driving assembly, thereby driving the nozzle to move, and the nozzle moves toward the glass plate for pre-spraying;

[0019] S3. After spraying, the control mounting frame moves downward so that the screen fits the glass plate. Then the ink is moved on the screen by scraping with a scraper. The pressure of the scraper makes the ink adhere to the glass plate through the holes of the screen. The ink is integrated with the pre-sprayed powder coating to form a printed pattern.

[0020] In summary, the present invention has the following beneficial effects: the present invention achieves gapless, high-quality printing by pre-spraying a layer of powder on the glass plate, then using screen printing technology to evenly distribute the powder on the product surface, and finally using a scraper to tightly combine the powder with the product. This technology can not only effectively process and print products with complex shapes, but also ensure the stability and durability of the pattern. The pre-spraying method can also reduce the content of powder coating in the ink on the screen, thereby reducing the risk of screen clogging and improving printing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is one of the schematic diagrams of the three-dimensional structure of the present invention;

[0022] Figure 2 This is the second schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 4 It is one of the three-dimensional structural schematic diagrams of the spraying mechanism of the present invention;

[0025] Figure 5 The second schematic diagram of the three-dimensional structure of the spraying mechanism of the present invention;

[0026] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at point A;

[0027] Figure 7 It is a schematic diagram of the cross-sectional structure of the support plate and the guide rail of the present invention;

[0028] Figure 8 for Figure 7 A schematic diagram of the enlarged structure at B;

[0029] Fig. 9 for Figure 7 A schematic diagram of the enlarged structure at C;

[0030] Fig.10 It is a schematic diagram of the structure of the flexible belt of the present invention when it is unfolded;

[0031] Fig.11 It is a schematic diagram of the main cross-sectional structure of the installation box of the present invention;

[0032] Fig.12 It is a schematic diagram of the top cross-sectional structure of the installation tube of the present invention.

[0033] In the figure: 1. frame; 2. placing table; 3. support frame; 4. supporting beam; 401. slide seat; 5. lifting seat; 6. scraper; 7. ink return knife; 8. mounting frame; 9. support plate; 901. slide groove; 10. guide rail; 11. first slider; 12. mounting rod; 13. nozzle; 14. injection port; 15. screw rod; 16. mounting box; 1601. extension port; 17. damping shaft; 18. flexible belt; 19. guide roller; 20. scraper; 21. mounting cylinder; 22. spring; 23. air inlet; 24. air outlet; 25. slide plate; 26. push plate; 27. second slider; 28. connecting box; 29. ​​one-way block; 30. spring; 31. traction rope; 32. guide ring; 33. adjustment plate; 34. limit rail; 35. motor. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] See also Figures 1 to 6In an embodiment of the present invention, a screen printing device based on pre-coated powder includes a frame 1, a support frame 3 is fixedly installed on one side of the top of the frame 1, a support beam 4 is installed on the front of the support frame 3 for sliding up and down, a slide 401 is installed on the support beam 4 for horizontal sliding, a lifting seat 5 is installed on the front of the slide 401 for sliding up and down, an ink return knife 7 and a scraper 6 are installed below the lifting seat 5, and the ink return knife 7 and the scraper 6 can be lifted and lowered independently, a driving structure is arranged on the back of the support frame 3 to drive the support beam 4 to lift and lower, a driving structure is arranged on the back of the support beam 4 to drive the slide 401 to slide horizontally, a driving structure is arranged on the slide 401 to drive the lifting seat 5 to lift and lower, and a pneumatic The structure drives the ink return knife 7 and the scraper 6 to rise and fall independently. The driving structure and the pneumatic structure are both existing technologies and are not described in detail here. The top of the frame 1 is provided with a placement table 2 for supporting the glass plate to be printed. The placement table 2 is provided with a positioning structure to position the glass plate. The height of the placement table 2 can be adjusted according to the thickness of the glass plate. A mounting frame 8 for fixing the screen is provided above the placement table 2. The mounting frame 8 is fixedly connected to the supporting crossbeam 4 through a connecting frame. A spraying mechanism is provided between the placement table 2 and the mounting frame 8. The spraying mechanism is used to spray powder coating on the surface of the glass plate to be printed. The spraying mechanism includes a support plate 9, a driving assembly and a mounting rod 12. The support plate 9 is fixed to the support frame 3 The mounting rod 12 and the support plate 9 are arranged vertically with each other, the driving assembly is arranged on the support plate 9, the driving assembly is connected to the mounting rod 12 in transmission, and a plurality of nozzles 13 are installed at the bottom end of the mounting rod 12, and the plurality of nozzles 13 are independently controlled, and the spraying timing can be preset according to the spraying pattern to form a specified pattern; before use, the screen is fixed in the mounting frame 8, and the ink in a colloidal state is poured on the screen. When printing, the glass plate is placed on the placing table 2, and then the mounting rod 12 is driven by the driving assembly to move horizontally, thereby driving the nozzle 13 to move. When the nozzle 13 moves, it is pre-sprayed toward the glass plate. After the spraying is completed, the mounting frame 8 is controlled to move downward so that the screen fits the glass plate, and then through The scraper 6 scrapes the ink so that the ink adheres to the glass plate through the holes of the silk screen, and the ink is integrated with the pre-sprayed powder coating to form a relatively stable pattern. The glass plate is then removed for tempering so that the coating is integrated with the glass plate. After printing, the ink return knife 7 is controlled to move downward, the scraper 6 moves upward, and the ink return knife 7 moves in the opposite direction to push the ink on the screen back to the initial position for the next printing. Printing is performed by pre-spraying powder dye on the glass plate, so that the particle size of the coating powder will not be limited by the mesh of the silk screen, so that a thicker coating can be printed on the glass plate. By pre-spraying, the content of powder coating in the ink on the screen can also be reduced, so that the silk screen is not easily blocked.This solution pre-sprays a layer of powder on the glass plate, then uses screen printing technology to evenly distribute the powder on the product surface, and finally uses a scraper 6 to tightly combine the powder with the product, thereby achieving a gapless, high-quality printing effect. This technology can effectively process and print products with complex shapes. ;

[0036] In this embodiment, preferably, the driving assembly includes a guide rail 10, a motor 35, a screw 15 and a first slider 11, the guide rail 10 is fixedly installed on the top of the support plate 9, the first slider 11 is slidably installed inside the guide rail 10, one end of the mounting rod 12 is fixedly connected to the first slider 11, a screw 15 is rotatably installed inside the guide rail 10, the screw 15 passes through the first slider 11, and the screw 15 is threadedly connected to the first slider 11, the motor 35 is fixedly installed at one end of the guide rail 10, and the output end of the motor 35 is fixedly connected to one end of the screw 15; the motor 35 can drive the screw 15 to rotate, and when the screw 15 rotates, it drives the first slider 11 to move on the guide rail 10, thereby driving the mounting rod 12 to move, and when the mounting rod 12 moves, it drives the nozzle 13 to move, thereby switching the spraying position.

[0037] In this embodiment, preferably, an injection port 14 is provided above the mounting rod 12 , and the powder coating can be input into the plurality of nozzles 13 through the injection port 14 .

[0038] When the spray head 13 is directly sprayed toward the glass plate, the boundary of the pattern is unclear. In order to solve this problem, the following embodiment is provided.

[0039] See also Figures 6 to 12 In the embodiment of the present invention, a mounting box 16 is fixedly installed on one side of the end of the support plate 9, a damping shaft 17 is rotatably installed inside the mounting box 16, a flexible belt 18 is wound and installed on the damping shaft 17, a through groove having the same shape as the pattern to be printed is provided on the flexible belt 18, a projection opening 1601 is provided on one side of the mounting box 16, one end of the flexible belt 18 extends out through the projection opening 1601, and a slide plate 25 is fixedly connected to one end of the flexible belt 18, a push plate 26 is fixedly installed on the top of the slide plate 25; before the nozzle 13 performs spraying, the slide plate 25 is pushed to move by the push plate 26, so that the flexible belt 18 extends out from the mounting box 16, thereby making the flexible belt 18 fully unfolded, and then the pattern can be sprayed through the nozzle 13, and the paint passes through the through groove on the flexible belt 18 and is sprayed on the glass plate.

[0040] In this embodiment, preferably, a slide groove 901 is provided on the front wall of the support plate 9, and a second slider 27 is slidably installed in the slide groove 901, and one end of the slider 25 is fixedly connected to the second slider 27, thereby limiting the sliding of the slider 25; the top of the push plate 26 is located on one side of the mounting rod 12, and when the mounting rod 12 moves toward the motor 35, the mounting rod 12 pushes the slider 25 toward the motor 35 through the push plate 26, and a locking component for locking the second slider 27 is provided on the side of the support plate 9 close to the motor 35. When the second slider 27 moves to the side of the slide groove 901 close to the motor 35, the locking component locks the second slider 27. At this time, the flexible belt 18 is fully unfolded, and then the nozzle 13 can be moved to the right for spraying.

[0041] In this embodiment, preferably, the locking assembly includes a connection box 28, a one-way block 29 and a traction rope 31, the connection box 28 is fixedly installed on the top side of the support plate 9 close to the motor 35, the one-way block 29 is slidably installed inside the connection box 28, the bottom of the one-way block 29 is provided with an inclined surface on the side away from the motor 35, the bottom of the one-way block 29 can be extended into the slide groove 901, the top of the one-way block 29 is fixedly connected with a spring 30, the top of the spring 30 is fixedly connected to the top wall of the connection box 28, one end of the traction rope 31 is extended into the connection box 28 and is fixedly connected to the top wall of the one-way block 29; the positive A limit rail 34 is fixedly installed on the side of the wall away from the motor 35, and an adjustment plate 33 is slidably installed on the limit rail 34. The end of the traction rope 31 away from the connecting box 28 is fixedly connected to the adjustment plate 33, and the top of the adjustment plate 33 is located on one side of the mounting rod 12. When the mounting rod 12 moves to the right to a section of the stroke before the limit position, the mounting rod 12 pushes the adjustment plate 33 to move so that the traction rope 31 pulls the one-way block 29 to move upward, so that the one-way block 29 releases the lock on the second slider 27; a plurality of guide rings 32 are arranged above the support plate 9, and the traction rope 31 passes through the plurality of guide rings 32, thereby limiting and guiding the traction rope 31.

[0042] In this embodiment, preferably, a mounting tube 21 is fixedly installed at one end of the mounting box 16, one end of the damping shaft 17 extends into the mounting tube 21, and a spring 22 is sleeved on the end of the damping shaft 17, one end of the spring 22 is fixedly connected to the damping shaft 17, and the other end of the spring 22 is fixedly connected to the inner wall of the mounting box 16; when the slide plate 25 moves to the side close to the motor 35 and the spray head 13 is sprayed, the mounting rod 12 moves to the right to the extreme position to push the adjustment plate 33 to move so that the traction rope 31 pulls the one-way block 29 to move upward, thereby releasing the lock of the one-way block 29 on the second slider 27. At this time, under the action of the spring 22, the damping shaft 17 rotates in the opposite direction, thereby causing the flexible belt 18 to be rewound around the damping shaft 17. Through the setting of the damping shaft 17, the damping shaft 17 can rotate slowly to prevent the flexible belt 18 from being wound up too fast.

[0043] In this embodiment, preferably, a guide roller 19 is rotatably installed at the bottom of the inner cavity of the installation box 16, and the flexible belt 18 passes over the guide roller 19. A scraper 20 is fixedly installed at the bottom of the inner cavity of the installation box 16, and the scraper 20 presses on the top wall of the flexible belt 18. One end of the installation box 16 is connected to an air inlet 23, and the other end of the installation box 16 is connected to an exhaust port 24; the exhaust port 24 is connected to a powder recovery device through a pipeline. When the flexible belt 18 is rolled up, the scraper 20 scrapes off the residual paint powder on the surface of the flexible belt 18. When the slide plate 25 is in contact with the installation box 16, air is input through the air inlet 23. Under the action of the airflow, the scraped powder is discharged through the exhaust port 24 for recovery, thereby preventing a large amount of powder from remaining in the flexible belt 18 and the installation box 16.

[0044] Working principle: Before use, fix the screen in the installation frame 8, and pour the colloid ink on the screen. When printing, place the glass plate on the placement table 2, and then drive the installation rod 12 to move horizontally to the left through the driving component, thereby driving the nozzle 13 to move to the left. At the same time, when the installation rod 12 moves, the push plate 26 pushes the slide plate 25 to move to the left, and the slide plate 25 moves to drive the second slide block 27 to move. When the second slide block 27 moves to the left side of the one-way block 29, the one-way block 29 locks the second slide block 27. At this time, the flexible belt 18 is fully unfolded, and then the connecting rod is controlled to move to the right. At this time, due to The second slider 27 is locked, and the slide plate 25 does not need to move. When the connecting rod moves to the right, the nozzle 13 is controlled to spray, and the paint passes through the through groove on the flexible belt 18 and is sprayed on the glass plate. After the spraying is completed, the mounting rod 12 moves to the right to the limit position, and the mounting rod 12 pushes the adjustment plate 33 to move so that the traction rope 31 pulls the one-way block 29 to move upward, so that the one-way block 29 releases the lock on the second slider 27. At this time, under the action of the clockwork 22, the damping shaft 17 rotates in the opposite direction, so that the flexible belt 18 is rewound back on the damping shaft 17 to prevent the flexible belt 18 from interfering with the downward movement of the screen for printing;

[0045] When the flexible belt 18 is rolled up, the scraper 20 scrapes off the residual paint powder on the surface of the flexible belt 18. When the slide plate 25 is attached to the installation box 16, air is input through the air inlet 23. Under the action of the air flow, the scraped powder is discharged through the exhaust port 24 for recycling, thereby preventing a large amount of powder from remaining in the flexible belt 18 and the installation box 16.

[0046] After spraying, the mounting frame 8 is controlled to move downward so that the screen fits the glass plate. The ink is then scraped by the scraper 6 so that the ink passes through the holes in the screen and adheres to the glass plate. The ink is integrated with the pre-sprayed powder coating to form a relatively stable pattern. The glass plate is then removed for tempering so that the coating and the glass plate are integrated.

[0047] The present invention also discloses a screen printing synergy enhancement method based on pre-coated powder, comprising the following steps:

[0048] S1. Before use, fix the screen in the mounting frame 8 and pour the colloid ink on the screen;

[0049] S2. When printing, the glass plate is placed on the placement table 2, and then the mounting rod 12 is driven by the drive assembly to move horizontally, thereby driving the nozzle 13 to move, and the nozzle 13 moves toward the glass plate for pre-spraying;

[0050] S3. After spraying is completed, the mounting frame 8 is controlled to move downward so that the screen fits the glass plate. Then, the ink is moved on the screen by scraping with a scraper 6. The pressure of the scraper 6 allows the ink to pass through the holes in the screen and adhere to the glass plate. The ink is then integrated with the pre-sprayed powder coating to form a printed pattern.

[0051] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A screen printing device based on pre-coated powder, comprising a frame (1), a support frame (3) is fixedly mounted on one side of the top of the frame (1), a support beam (4) is slidably mounted on the front of the support frame (3), a slide seat (401) is horizontally slidably mounted on the support beam (4), a lifting seat (5) is slidably mounted on the front of the slide seat (401), an ink return knife (7) and a scraper (6) are mounted below the lifting seat (5), characterized in that: A placement table (2) for supporting the glass plate to be printed is arranged at the top of the frame (1); a mounting frame (8) for fixing the screen is arranged above the placement table (2); the mounting frame (8) is fixedly connected to the support beam (4) via a connecting frame; a spraying mechanism is arranged between the placement table (2) and the mounting frame (8); the spraying mechanism is used to spray powder coating on the surface of the glass plate to be printed; the spraying mechanism comprises a support plate (9), a driving assembly and a mounting rod (12); the support plate (9) is fixedly connected to the support frame (3); the mounting rod (12) and the support plate (9) are arranged perpendicular to each other; the driving assembly is arranged on the support plate (9); the driving assembly is connected to the mounting rod (12) in a transmission manner; and a plurality of spray heads (13) are installed at the bottom end of the mounting rod (12); The driving assembly comprises a guide rail (10), a motor (35), a screw rod (15) and a first slider (11); the guide rail (10) is fixedly mounted on the top of the support plate (9); the first slider (11) is slidably mounted inside the guide rail (10); one end of the mounting rod (12) is fixedly connected to the first slider (11); a screw rod (15) is rotatably mounted inside the guide rail (10); the screw rod (15) passes through the first slider (11), and the screw rod (15) is threadedly connected to the first slider (11); the motor (35) is fixedly mounted on one end of the guide rail (10); and an output end of the motor (35) is fixedly connected to one end of the screw rod (15); A mounting box (16) is fixedly mounted on one side of the end of the support plate (9), a damping shaft (17) is rotatably mounted inside the mounting box (16), a flexible belt (18) is wound around the damping shaft (17), a through groove having the same shape as the pattern to be printed is formed on the flexible belt (18), a projection opening (1601) is formed on one side of the mounting box (16), one end of the flexible belt (18) is extended through the projection opening (1601), and one end of the flexible belt (18) is fixedly connected to a slide plate (25), a push plate (26) is fixedly mounted on the top of the slide plate (25).

2. A screen printing device based on pre-coated powder according to claim 1, characterized in that: A sliding groove (901) is provided on the front wall of the support plate (9), a second sliding block (27) is slidably mounted in the sliding groove (901), and one end of the sliding block (25) is fixedly connected to the second sliding block (27).

3. A screen printing device based on pre-coated powder according to claim 2, characterized in that: The top of the push plate (26) is located on one side of the mounting rod (12); when the mounting rod (12) moves toward the motor (35), the mounting rod (12) pushes the slide plate (25) to move toward the motor (35) via the push plate (26); a locking component for locking the second slide block (27) is provided on one side of the support plate (9) close to the motor (35); when the second slide block (27) moves to a side of the slide groove (901) close to the motor (35), the locking component locks the second slide block (27).

4. A screen printing device based on pre-coated powder according to claim 3, characterized in that: The locking assembly comprises a connection box (28), a one-way block (29) and a traction rope (31); the connection box (28) is fixedly mounted on a side of the top end of the support plate (9) close to the motor (35); a one-way block (29) is slidably mounted inside the connection box (28); a side of the bottom of the one-way block (29) away from the motor (35) is provided with an inclined surface; the bottom of the one-way block (29) can extend into the slide groove (901); a spring (30) is fixedly connected to the top end of the one-way block (29); the top end of the spring (30) is fixedly connected to the top wall of the connection box (28); one end of the traction rope (31) extends into the connection box (28) and is fixedly connected to the top wall of the one-way block (29).

5. A screen printing device based on pre-coated powder according to claim 4, characterized in that: A limit rail (34) is fixedly mounted on a side of the front wall of the guide rail (10) away from the motor (35), an adjustment plate (33) is slidably mounted on the limit rail (34), one end of the traction rope (31) away from the connection box (28) is fixedly connected to the adjustment plate (33), and the top of the adjustment plate (33) is located on one side of the mounting rod (12).

6. A screen printing device based on pre-coated powder according to claim 5, characterized in that: A mounting tube (21) is fixedly mounted on one end of the mounting box (16), one end of the damping shaft (17) extends into the mounting tube (21), a spring (22) is sleeved on the end of the damping shaft (17), one end of the spring (22) is fixedly connected to the damping shaft (17), and the other end of the spring (22) is fixedly connected to the inner wall of the mounting box (16).

7. A screen printing device based on pre-coated powder according to claim 1, characterized in that: A scraper (20) is fixedly mounted on the bottom of the inner cavity of the installation box (16), and the scraper (20) is pressed on the top wall of the flexible belt (18). One end of the installation box (16) is connected to an air inlet (23), and the other end of the installation box (16) is connected to an air outlet (24).

8. A method for improving printing effect by using the screen printing device based on pre-coated powder according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Before use, fix the screen in the mounting frame (8) and pour the colloid ink on the screen; S2. When printing, the glass plate is placed on the placement table (2), and then the mounting rod (12) is driven horizontally by the driving assembly, thereby driving the nozzle (13) to move, and the nozzle (13) moves toward the glass plate for pre-spraying; S3. After spraying is completed, the control mounting frame (8) moves downward so that the screen fits the glass plate, and then the ink is moved on the screen by scraping with a scraper (6). The pressure of the scraper (6) causes the ink to pass through the holes of the screen and adhere to the glass plate. The ink is then integrated with the pre-sprayed powder coating to form a printed pattern.

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