Full-automatic silk screen printing device for glass cover plate

Abstract

The application relates to the technical field of glass cover plate processing, and particularly discloses a full-automatic silk-screen device for glass cover plates, which is provided with a horizontal reciprocating moving carrier, realizes full-automatic feeding, silk-screen station conveying and discharging of the glass cover plate, is provided with a dust cleaning structure with a dust cleaning scraper and an inclined spray port, can mechanically scrape and high-pressure airflow clean the surface of the glass cover plate before silk-screen, completely removes surface dust and impurities, is provided with a wind box structure capable of being reversed by lifting, can be automatically switched to a air-drying mode after silk-screen, uniformly air-dries and solidifies the ink layer after silk-screen at a low speed, realizes full-process integrated full-automatic operation of dust cleaning before silk-screen, silk-screen operation and air-drying after silk-screen of the glass cover plate, and solves the problem that the traditional glass cover plate silk-screen device does not have the integrated functions of automatic dust cleaning before silk-screen and automatic air-drying after silk-screen.

Description

Technical Field

[0001] This application relates to the field of glass cover processing technology, and specifically discloses a fully automatic screen printing device for glass covers. Background Technology

[0002] In the production and processing of glass covers, screen printing is mainly used to print functional and decorative coatings such as protective inks, brand logos, and decorative patterns on the surface of the glass cover.

[0003] The screen printing device for glass cover processing mainly consists of an operating table, a vertical guide mechanism, a horizontal slide table, a screen printing stencil clamping mechanism, and a scraper driving mechanism. The screen printing stencil is fixed by the clamping frame, and the scraper is driven by a cylinder to vertically lift and press against the stencil. Combined with horizontal movement, ink is scraped and printed to complete the screen printing operation of the glass cover.

[0004] However, during the transfer and loading process, dust, floating dust, and tiny particulate impurities easily adhere to the surface of the glass cover. If these impurities are not cleaned before screen printing, defects such as pinholes, ink shortages, broken patterns, and insufficient ink adhesion will occur in the screen printing layer, significantly reducing product yield. Therefore, manual wiping and cleaning are usually required, which not only increases the labor intensity of operators but also results in inconsistent cleaning and low efficiency.

[0005] Meanwhile, the ink on the surface of the glass cover after screen printing is in an uncured state. The existing equipment does not have an in-situ air drying and curing function. Operators need to remove the screen-printed glass cover from the screen printing device and transfer it to a dedicated drying and curing equipment for processing. During the transfer process, the screen printing layer is very easy to be scratched or smudged, resulting in product scrap.

[0006] Existing automatic screen printing equipment can only perform basic screen printing functions and does not have the integrated function of automatic dust removal before screen printing and automatic air drying after screen printing, so it cannot achieve fully automatic operation of the entire process of screen printing on glass covers.

[0007] This invention provides a fully automatic screen printing device for glass covers to solve the above-mentioned problems. Summary of the Invention

[0008] The purpose of this invention is to solve the problem that traditional glass cover screen printing devices do not have the integrated function of automatic dust removal before screen printing and automatic air drying after screen printing.

[0009] To achieve the above objectives, the basic solution of the present invention provides a fully automatic screen printing device for glass covers, comprising: The operating table has a transfer groove on its top surface along the front-to-back direction. The transfer and conveying mechanism is installed inside the operating table, including a transfer table and a chain power mechanism that drives the transfer table to move horizontally back and forth along the transfer chute. The transfer table is provided with suction cups for adsorbing and fixing the glass cover plate. The integrated dust removal and drying mechanism is mounted on the front side of the top of the operating table via a mounting bracket, and includes a third cylinder, a limit slide, a pneumatic wheel, a scraper, a wind box, and a reversing assembly. The pneumatic wheel is rotatably connected to the limiting slide. The third cylinder drives the limiting slide to rise and fall vertically. The scraper and the air box are respectively fixed to the opposite side walls of the pneumatic wheel. The reversing assembly is connected to the pneumatic wheel drive. When the limiting slide is raised and lowered, it drives the pneumatic wheel to rotate 180°, so that the scraper and the air box alternately switch downwards. The air impeller has an internal ventilation chamber, and the end of the air impeller has a vent that communicates with the ventilation chamber. The vent is connected to a low-speed air inlet pipe. The internal cavity of the air box is connected to the ventilation chamber inside the air impeller. The bottom of the air box has multiple sets of air outlet holes that are evenly arranged in a matrix. The screen printing mechanism is located on the rear side of the top surface of the operating table, including a vertical guide rod, a horizontal slide, a clamping frame and a squeegee assembly. The horizontal slide moves vertically up and down along the vertical guide rod. The clamping frame is slidably mounted on the horizontal slide for clamping the screen printing stencil. The squeegee assembly can move horizontally back and forth along the horizontal slide to complete the ink scraping. The controller is used to control the transplant chain power mechanism, the third cylinder, and the screen printing mechanism.

[0010] Furthermore, the reversing assembly includes a rack and a gear. The rack is vertically fixed to the inner side wall of the column of the mounting frame. The two ends of the pneumatic wheel are fixed to a rotating shaft that is rotatably connected to the limiting slide. The gear is coaxially fixed to the end of the rotating shaft of the pneumatic wheel. The gear and the rack mesh with each other. When the limiting slide moves vertically up and down, the pneumatic wheel is driven to rotate circumferentially through the meshing of the gear and the rack.

[0011] Furthermore, the bottom end of the scraper platform is integrally formed with a dust removal scraper, and the inside of the scraper platform has an air guide channel. One end of the air guide channel is connected to the ventilation chamber inside the impeller, and the other end of the air guide channel is connected to an inclined nozzle. The inclined nozzle is inclined downwards towards the working direction of the dust removal scraper.

[0012] Furthermore, the tilt angle of the tilted nozzle is 30° to 45°.

[0013] Furthermore, the air vent is connected to a low-speed air inlet pipe via a three-way valve, and the free end of the three-way valve is also connected to a high-speed air inlet pipe. The air velocity of the high-speed air inlet pipe is 15-20 m / s, and the air velocity of the low-speed air inlet pipe is 3-5 m / s.

[0014] Furthermore, the diameter of the air drying outlet is 1-2 mm, and the spacing between the outlets is 5-8 mm.

[0015] Furthermore, the chain power mechanism includes a drive motor, a transmission chain, and two sets of transmission sprockets. The two sets of transmission sprockets are rotatably connected to the left and right ends of the transfer slide, respectively, and the transmission chain is looped around the two sets of transmission sprockets. The side wall of the transfer platform is rotatably connected to a linkage sprocket, which meshes with the transmission chain to drive the transfer platform to move horizontally back and forth along the transfer chute.

[0016] Furthermore, a fourth cylinder is vertically fixed at each of the four corners of the top surface of the transfer platform, and a pad is fixed to the top of the piston rod of the fourth cylinder, with the top surfaces of the four pads on the same horizontal plane.

[0017] The principle and effect of this solution are as follows: Compared with existing technologies, this invention features a horizontally reciprocating transfer platform, enabling fully automated feeding, screen printing station conveying, and unloading of glass cover plates. It also includes a dust removal structure with a scraper and inclined nozzles, allowing for dual dust removal of the glass cover plate surface before screen printing, combining mechanical scraping and high-pressure airflow cleaning to thoroughly remove surface dust and impurities. Furthermore, it incorporates a reversible bellows structure that automatically switches to air-drying mode after screen printing, allowing for low-speed, uniform air-drying and curing of the ink layer. This invention achieves fully automated, integrated operation of the entire process, from pre-screening dust removal to screen printing and post-screening air drying, solving the problem that traditional glass cover plate screen printing devices lack integrated functions for both pre-screening automatic dust removal and post-screening automatic air drying. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A side view of a fully automatic screen printing device for glass covers according to an embodiment of this application is shown; Figure 2 A top view of a fully automatic screen printing device for glass covers according to an embodiment of this application is shown; Figure 3 A partial schematic diagram of the dust removal operation state of a fully automatic screen printing device for glass covers according to an embodiment of this application is shown; Figure 4 A partial schematic diagram of the air-drying operation state of a fully automatic screen printing device for glass covers according to an embodiment of this application is shown; Figure 5 A partial cross-sectional view of a fully automatic screen printing device for glass covers according to an embodiment of this application is shown. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] The reference numerals in the accompanying drawings include: operating table 1, vertical guide rod 2, horizontal slide table 3, clamping frame 4, first scraper 5, second scraper 6, first cylinder 7, second cylinder 8, third cylinder 9, limiting slide table 10, rack 11, pneumatic wheel 12, bellows 13, gear 14, transfer table 15, suction cup 16, pad block 17, linkage sprocket 18, scraper table 19, and air hole 20.

[0022] A fully automatic screen printing device for glass covers, implementing, for example... Figure 1 , Figure 2 As shown: The system includes an operating table 1, on which, from front to back, are a dust removal and drying integrated mechanism and a screen printing mechanism. An internal transfer and conveying mechanism is also installed on the operating table 1, which can move the glass cover to be processed sequentially through the dust removal station, screen printing station, and drying station to complete the fully automated operation.

[0023] The operating table 1 is a horizontal rectangular cabinet structure. The top surface of the operating table 1 has a horizontally continuous transfer groove along the front-to-back direction. The front end of the transfer groove extends to the bottom of the dust removal and drying integrated mechanism, and the rear end extends to the bottom of the screen printing mechanism, providing guidance for the movement of the transfer table 15.

[0024] The transfer conveying mechanism includes a chain power mechanism, a transfer platform 15, a suction cup 16, a pad 17, and a fourth cylinder. The chain power mechanism includes a drive motor, a transmission chain, and two sets of transmission sprockets. The two sets of transmission sprockets are rotatably connected to the left and right ends of the transfer chute via bearings. The transmission chain is looped around the two sets of transmission sprockets. The drive motor is bolted and fixed inside the operating table 1. The output shaft of the drive motor is coaxially fixed to one set of transmission sprockets, driving the transmission chain to rotate cyclically. The transfer platform 15 is a horizontally positioned rectangular platform. The sidewalls of the transfer platform 15 are slidably connected to the transfer chute via sliders. Linkage sprockets 18 are rotatably connected to both sides of the sidewalls of the transfer platform 15 via bearings. The linkage sprockets 18 mesh with the transmission chain. When the transmission chain rotates, the linkage sprockets 18 drive the transfer platform 15 to move horizontally back and forth along the transfer chute, achieving fully automatic transport of the glass cover between various workstations.

[0025] A suction cup 16 is fixed to the center of the top surface of the transfer stage 15 via a support rod. The top working surface of the suction cup 16 is adapted to the bottom surface of the glass cover plate. The suction cup 16 is connected to a vacuum generator via an air pipe, which can generate negative pressure to adsorb and fix the glass cover plate to be processed. A fourth cylinder is vertically fixed to each of the four corners of the top surface of the transfer stage 15. A pad 17 is fixed to the top of the piston rod of the fourth cylinder. The top surface of the pad 17 is provided with an anti-slip buffer pad. The top surfaces of the four pads 17 are on the same horizontal plane. By extending and retracting the piston rod of the fourth cylinder, the support height of the pad 17 can be adjusted, thereby adjusting the height of the screen printing reference surface of the glass cover plate to adapt to the processing requirements of glass cover plates of different thicknesses. At the same time, it provides stable support for the four corners of the glass cover plate, preventing the glass cover plate from warping or shaking during the screen printing process.

[0026] The screen printing mechanism is located on the rear side of the top surface of the operating table 1, and includes two vertical guide rods 2, a horizontal slide 3, two sets of clamping frames 4, a first scraper 5, a second scraper 6, a first cylinder 7, and a second cylinder 8. The first scraper 5, the second scraper 6, the first cylinder 7, and the second cylinder 8 constitute the scraper assembly. The two vertical guide rods 2 are vertically welded and fixed to the left and right sides of the top surface of the operating table 1, respectively. The left and right ends of the horizontal slide 3 are slidably connected to the two vertical guide rods 2 through linear bearings. Lifting drive cylinders are also fixed to the left and right sides of the top surface of the operating table 1, respectively. The top of the piston rod of the lifting drive cylinder is fixed to the bottom surface of the horizontal slide 3, and is used to drive the horizontal slide 3 to move vertically up and down along the vertical guide rods 2. The front side wall of the transverse slide table 3 is equipped with a horizontally continuous transverse guide rail. Two sets of clamping frames 4 are symmetrically slidably arranged on the transverse guide rail. The clamping frames 4 are equipped with locking bolts. The distance between the two sets of clamping frames 4 can be adjusted according to the size of the screen printing stencil, and the clamping bolts can be used to lock and fix the screen printing stencil, so as to achieve stable clamping of the screen printing stencil.

[0027] The first cylinder 7 and the second cylinder 8 are symmetrically fixed to the top surface of the transverse slide 3 via mounting bases. The piston rods of both cylinders are vertically downward. The bottom end of the piston rod of the first cylinder 7 is fixed to the top end of the first scraper 5, and the bottom end of the piston rod of the second cylinder 8 is fixed to the top end of the second scraper 6. Both scrapers 5 and 6 are made of polyurethane wear-resistant scrapers, with their bottom cutting edges in contact with the top surface of the screen printing stencil. The transverse slide 3 is also equipped with a screen printing drive module, which is a linear motor module. The mounting bases of the first cylinder 7 and the second cylinder 8 are fixed to the slide of the linear motor module, which can drive the first scraper 5 and the second scraper 6 to move horizontally back and forth along the transverse slide 3. Combined with the vertical lifting and lowering of the first cylinder 7 and the second cylinder 8, the fully automatic screen printing operation of the glass cover is completed.

[0028] The integrated dust removal and air drying mechanism is mounted on the front of the top of the operating table 1 via a mounting frame. The mounting frame is a gate-shaped welded frame, with its bottom end welded and fixed to the top surface of the operating table 1. A third cylinder 9 is vertically fixed to the center of the top surface of the crossbeam of the mounting frame. The piston rod of the third cylinder 9 extends vertically downward through the crossbeam of the mounting frame, and its bottom end is fixed to the top of the limiting slide 10. The limiting slide 10 is vertically arranged and rectangular. The left and right sides of the limiting slide 10 are vertically slidably connected to the inner side of the column of the mounting frame via guide rail sliders, ensuring that the limiting slide 10 can stably rise and fall vertically under the drive of the third cylinder 9 without radial swaying.

[0029] The integrated dust removal and drying mechanism also includes a pneumatic impeller 12, an air box 13, a scraper 19, and a reversing assembly. The pneumatic impeller 12 is a cylindrical wheel with a sealed ventilation chamber inside. The left and right ends of the pneumatic impeller 12 are rotatably connected to the inner side of the limiting slide 10 via a rotating shaft, allowing it to rotate circumferentially around the shaft. The reversing assembly includes a rack 11 and a gear 14. The rack 11 is vertically fixed to the inner wall of the mounting frame's column, and the gear 14 is coaxially fixed to the end of the pneumatic impeller 12's rotating shaft. The gear 14 and rack 11 mesh and mesh. When the third cylinder 9 drives the limiting slide 10 to move vertically up and down, the gear 14 moves synchronously with the limiting slide 10. Through meshing with the rack 11, it drives the pneumatic impeller 12 to rotate circumferentially around the shaft, achieving a 180° reversal of the pneumatic impeller 12.

[0030] The scraper platform 19 is integrally formed and fixed to one side wall of the impeller 12. A dust-removing scraper is integrally formed at the bottom of the scraper platform 19. The dust-removing scraper is made of anti-static polyurethane and has a flat bottom edge, allowing it to scrape away dust and impurities adhering to the top surface of the glass cover. An air guide channel is opened inside the scraper platform 19. One end of the air guide channel connects to the ventilation chamber of the impeller 12, and the other end connects to an inclined nozzle. The inclined nozzle is tilted downwards towards the working direction of the dust-removing scraper at an angle of 30° to 45°, allowing high-pressure airflow to be precisely sprayed onto the scraping area of ​​the dust-removing scraper, achieving a dual dust-removing effect of mechanical scraping and airflow cleaning.

[0031] The air box 13 is integrally formed and fixed to the opposite side wall of the air wheel 12 and the scraper 19. The air box 13 is a flat rectangular box with an internal cavity that is connected to the ventilation chamber of the air wheel 12. The bottom of the air box 13 has multiple sets of drying air outlet holes arranged in a matrix. The diameter of the drying air outlet holes is 1-2mm and the hole spacing is 5-8mm. It can output a uniform and gentle drying airflow to achieve uniform drying and curing of the ink layer after screen printing.

[0032] The end of the impeller 12 also has an air hole 20 that communicates with the ventilation chamber. The air hole 20 is connected to a three-way valve via a high-pressure air pipe. The other two ports of the three-way valve are connected to the high-speed air inlet pipe and the low-speed air inlet pipe, respectively. Both the high-speed and low-speed air inlet pipes are connected to an external high-pressure air source. The air velocity of the high-speed air inlet pipe is set to 15-20 m / s for dust removal operations, and the air velocity of the low-speed air inlet pipe is set to 3-5 m / s for air drying operations. The three-way valve is an electromagnetic three-way valve, which is electrically connected to the controller. The controller is also electrically connected to the drive motor, the third cylinder 9, the vacuum generator, and the various drive components of the screen printing mechanism, enabling fully automatic coordinated control of the entire device.

[0033] When using this invention, it consists of four core stages: material feeding and positioning, pre-screening dust removal, fully automatic screen printing, and post-screening drying. The specific operation process is as follows: Material loading and positioning stage: The controller starts the drive motor, moving the transfer table 15 to the frontmost loading position of the operating table 1. The glass cover to be screen-printed is placed stably on the four pads 17. The vacuum generator is started, and the glass cover is fixed by suction cups 16. According to the thickness specification of the glass cover, the controller controls the fourth cylinder to adjust the support height of the pads 17, adjusting the top surface of the glass cover to the preset screen-printing reference surface, completing the material loading and positioning.

[0034] Pre-screen printing dust removal stage: The controller controls the piston rod of the third cylinder 9 to extend, driving the limit slide 10 to descend to the dust removal station. At this time, the gear 14 and rack 11 mesh and drive the air wheel 12 to rotate to the position where the scraper 19 faces downward and the air box 13 faces upward, with the bottom end of the dust removal scraper in contact with the top surface of the glass cover. At the same time, the controller controls the three-way valve to switch to the high-speed air inlet pipe passage, and the high-pressure, high-speed airflow enters the ventilation chamber and is sprayed out at high speed from the inclined nozzle through the air guide channel. The controller controls the drive motor to start, and drives the transfer platform 15 to move backward at a uniform speed through the transmission chain. When the glass cover passes the dust removal station, the dust removal scraper first scrapes off the large particles of impurities and floating dust attached to the surface, and the high-speed airflow sprayed from the inclined nozzle simultaneously performs a secondary cleaning of the scraping area, thoroughly removing dust and impurities from the surface of the glass cover, completing the fully automatic dust removal before screen printing. After the dust removal is completed, the transfer platform 15 continues to move backward to the screen printing station.

[0035] Fully automated screen printing stage: After the transfer table 15 moves the cleaned glass cover to the screen printing station, the controller stops the drive motor. The lifting drive cylinder lowers the horizontal slide 3 to the screen printing station, and the screen printing stencil held by the two clamping frames 4 is attached to the top surface of the glass cover. The controller controls the piston rod of the first cylinder 7 to extend, causing the first scraper 5 to descend and attach to the screen printing stencil. The screen printing drive module moves the first scraper 5 laterally to complete the first ink scraping. Subsequently, the first cylinder 7 moves the first scraper 5 upward, and the second cylinder 8 moves the second scraper 6 downward to attach to the screen printing stencil. The screen printing drive module moves the second scraper 6 laterally in the opposite direction to complete the second ink return scraping, realizing the fully automated screen printing operation of the glass cover.

[0036] Post-screen printing drying stage: After screen printing is completed, the controller controls the piston rod of the third cylinder 9 to retract, driving the limit slide 10 to rise. Gear 14 and rack 11 mesh in opposite directions, driving the air wheel 12 to rotate 180° and reverse direction, so that the air box 13 faces downward and the scraper 19 faces upward. At the same time, the controller controls the three-way valve to switch to the low-speed air inlet passage, and the low-pressure, low-speed airflow enters the ventilation chamber and is evenly sprayed out from the drying air outlet at the bottom of the air box 13. The controller controls the drive motor to start in reverse, driving the transfer table 15 to move forward at a uniform speed. When the screen-printed glass cover passes through the drying station, the gentle airflow sprayed from the air box 13 evenly covers the screen printing ink layer on the surface of the glass cover, realizing the rapid drying and curing of the ink. After the transfer table 15 moves back to the loading station, the vacuum generator is turned off, and the screen-printed and dried glass cover can be removed, completing the fully automated processing of a single glass cover.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A fully automatic screen printing device for glass covers, characterized in that, include: The top surface of the operating table (1) has a transfer groove along the front-back direction; The transfer conveying mechanism is set in the operating table (1) and includes a transfer table (15) and a chain power mechanism that drives the transfer table (15) to move horizontally back and forth along the transfer chute. The transfer table (15) is provided with a suction cup (16) for adsorbing and fixing the glass cover plate. The dust removal and drying integrated mechanism is installed on the front side of the top of the operating table (1) via a mounting bracket, and includes a third cylinder (9), a limiting slide (10), a pneumatic wheel (12), a scraper (19), a wind box (13), and a reversing assembly; The pneumatic wheel (12) is rotatably connected to the limiting slide (10). The third cylinder (9) drives the limiting slide (10) to rise and fall vertically. The scraper (19) and the bellows (13) are respectively fixed to the opposite side walls of the pneumatic wheel (12). The reversing assembly is connected to the pneumatic wheel (12) in a transmission. When the limiting slide (10) rises and falls, it drives the pneumatic wheel (12) to rotate 180°, so that the scraper (19) and the bellows (13) alternately switch downwards. The air impeller (12) has an internal ventilation chamber. The end of the air impeller (12) has a wind hole (20) that communicates with the ventilation chamber. The wind hole (20) is connected to a low-speed air inlet pipe. The internal cavity of the air box (13) is connected to the ventilation chamber inside the air impeller (12). The bottom of the air box (13) has multiple sets of air drying outlet holes arranged in a matrix. The screen printing mechanism is located on the rear side of the top surface of the operating table (1), including a vertical guide rod (2), a horizontal slide (3), a clamping frame (4) and a squeegee assembly. The horizontal slide (3) moves vertically up and down along the vertical guide rod (2), and the clamping frame (4) is slidably disposed on the horizontal slide (3) to clamp the screen printing plate. The squeegee assembly can move horizontally back and forth along the horizontal slide (3) to complete the ink scraping. The controller is used to control the transplant chain power mechanism, the third cylinder (9), and the screen printing mechanism.

2. The fully automatic screen printing device for glass covers according to claim 1, characterized in that, The reversing assembly includes a rack (11) and a gear (14). The rack (11) is vertically fixed to the inner side wall of the column of the mounting frame. The two ends of the pneumatic wheel (12) are fixed with rotating shafts that are rotatably connected to the limiting slide (10). The gear (14) is coaxially fixed to the end of the rotating shaft of the pneumatic wheel (12). The gear (14) meshes with the rack (11). When the limiting slide (10) moves vertically up and down, the pneumatic wheel (12) is driven to rotate circumferentially through the meshing of the gear (14) and the rack (11).

3. The fully automatic screen printing device for glass covers according to claim 1, characterized in that, The bottom end of the scraper platform (19) is integrally formed with a dust removal scraper. The inside of the scraper platform (19) is an air guide channel. One end of the air guide channel is connected to the ventilation chamber inside the air wheel (12). The other end of the air guide channel is connected to an inclined nozzle. The inclined nozzle is inclined downward towards the working direction of the dust removal scraper.

4. The fully automatic screen printing device for glass covers according to claim 3, characterized in that, The tilt angle of the tilted nozzle is 30° to 45°.

5. The fully automatic screen printing device for glass covers according to claim 3, characterized in that, The air vent (20) is connected to the low-speed air inlet pipe through a three-way valve. The free end of the three-way valve is also connected to the high-speed air inlet pipe. The air speed of the high-speed air inlet pipe is 15-20 m / s, and the air speed of the low-speed air inlet pipe is 3-5 m / s.

6. The fully automatic screen printing device for glass covers according to claim 1, characterized in that, The diameter of the air outlet hole is 1-2mm, and the hole spacing is 5-8mm.

7. The fully automatic screen printing device for glass covers according to claim 1, characterized in that, The chain power mechanism includes a drive motor, a transmission chain, and two sets of transmission sprockets. The two sets of transmission sprockets are rotatably connected to the left and right ends of the transfer slide, and the transmission chain is looped around the two sets of transmission sprockets. The side wall of the transfer platform (15) is rotatably connected to a linkage sprocket (18), which meshes with the transmission chain to drive the transfer platform (15) to move horizontally back and forth along the transfer chute.

8. The fully automatic screen printing device for glass covers according to claim 1, characterized in that, The top surface of the transfer platform (15) is vertically fixed at the four corners of each of the four corners of the platform. The piston rod of the fourth cylinder is fixed with a pad (17) at the top. The top surfaces of the four pads (17) are on the same horizontal plane.

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