A curved surface glass screen printing machine

Abstract

The present application discloses a curved glass screen printing machine, belonging to the technical field of screen printing machines. It mainly includes a pre-positioning mechanism, which has four groups of positioning blocks for initially positioning the curved glass; a fine-positioning mechanism, which has four groups of CCD cameras for precisely positioning the curved glass; a conveying mechanism, which has a die fixture for adjusting the angle of the curved glass, a doctor blade body for initially covering the ink to the mesh holes of the screen printing plate, and a doctor blade module for printing on the curved glass; an anti-abrasion mechanism, and the anti-abrasion mechanism includes: a connecting frame, a seat body is installed at one end of the connecting frame, a partition plate is installed between the two seat bodies, and there is a certain horizontal distance between the partition plate and the doctor blade part. In the curved glass screen printing machine of the present application, by setting the partition plate, a slight upward extrusion force is generated on the screen printing plate, accelerating the separation of the curved glass from the printing plate of the screen printing plate and avoiding the inclined separation phenomenon caused by the sticking of the two.

Description

Technical Field

[0001] This application relates to the technical field of screen printers, and specifically to a screen printer for curved glass. Background Art

[0002] A screen printer, namely a screen printing press, is a device that prints based on the basic principle that the mesh holes in the graphic part of the screen printing plate can pass through the ink, while the mesh holes in the non-graphic part cannot pass through the ink, with the screen printing plate as the base plate;

[0003] Screen printing consists of five major elements: a screen printing plate, a squeegee, ink, a printing table, and a substrate. During printing, ink is poured at one end of the screen printing plate, and the squeegee applies a certain pressure to the ink area and moves towards the other end. The ink is squeezed by the squeegee from the mesh holes in the graphic part onto the substrate.

[0004] When printing on curved glass, the curved glass is placed on the printing platform of the screen printer and closely attached to the printing platform. Then, an appropriate amount of prepared ink is poured at one end of the screen printing plate, and the screen printer is started. The squeegee moves from one end of the screen printing plate to the other end at a certain speed and pressure. At this time, the printing platform on which the curved glass is placed rotates in the X direction, automatically rotating at an angle between 15° and -15°, so that the curved glass on the printing platform always contacts the printing screen. The squeegee continuously moves at a certain speed and pressure, and the ink will be evenly transferred to the surface of the curved glass through the mesh holes of the screen printing plate, completing the printing of patterns and text;

[0005] However, when the printing position on the curved glass is completed, the printing platform drives the curved glass to rotate, and as the curved glass gradually moves away from the screen printing plate, the relative position between the two changes. During this process, due to the continuous rotation of the curved glass, when the surface of the printed curved glass separates from the screen printing plate, since the contact angle between the screen printing plate and the surface of the curved glass transitions from a vertical state to an inclined state, it may cause the printed curved glass and the screen printing plate to separate obliquely, and thus there may be a certain amount of friction between the two, resulting in the curved glass possibly being slightly scratched by the printing plate, thereby causing abrasion, and further affecting the ink already printed on the curved glass. Therefore, it is necessary to provide a screen printer for curved glass to solve the above problems.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the above problems existing in the prior art, the problem to be solved by this application is to provide a curved glass screen printing machine, which realizes pushing the screen printing plate through a partition plate, avoiding contact and scratching between the glass and the printing plate, protecting the ink, and ensuring stable and reliable printing quality.

[0008] The technical solution adopted by this application to solve its technical problems is: a curved glass screen printing machine, including: a pre-positioning mechanism, which has four positioning blocks for initially positioning the curved glass, and a first cylinder for driving the positioning blocks close to the curved glass; a fine-positioning mechanism, which has four CCD cameras for finely positioning the curved glass; a conveying mechanism, which has a mold fixture for adjusting the angle of the curved glass, a second motor for driving the mold fixture to rotate, a doctor blade body for initially covering the ink into the mesh holes of the screen printing plate, and a doctor blade module for printing on the curved glass. The doctor blade module includes a first doctor blade part fixedly installed at the middle position of the doctor blade holder, and a second doctor blade part and a third doctor blade part with the curvature of the doctor blade controlled by a bending servo in front of and behind the first doctor blade part, and a chain linear conveying module for controlling the movement of the doctor blade body and the doctor blade module along the direction of the screen printing plate; an anti-abrasion mechanism, which is installed on the fine-positioning mechanism. The anti-abrasion mechanism includes: a connecting frame, which is installed on the fine-positioning mechanism. A seat body is installed at one end of the connecting frame. A partition plate is installed between the two seat bodies. There is a certain horizontal distance between the partition plate and the doctor blade part. The partition plate is located at the lower end of the screen printing plate. Among them: the partition plate is adapted to contact the screen printing plate from the bottom, generate a slight upward extrusion force on the screen printing plate, and is adapted to quickly and effectively separate the screen printing plate at the printing position from the curved glass.

[0009] Further, a plurality of groups of leakage holes are equidistantly arranged on the partition plate. A collecting hopper is connected and installed at the bottom of the partition plate. Valves are connected and installed at both ends of the collecting hopper.

[0010] Further, the positioning mechanism includes a first base. First guide rails are installed at positions close to both ends on the first base. Two first mounting seats are installed on the first guide rails. A first cylinder is installed on the first mounting seats. The output ends of the two first cylinders are connected and installed with a second guide rail. An installation plate is installed on the second guide rail. The positioning blocks are installed on the installation plate.

[0011] Further, two third guide rails are installed at positions close to both sides on the first base. Two sliders are slidably installed on the third guide rails. Four mounting frames are fixedly installed on the sliders. A photoelectric sensor is installed on the mounting frame.

[0012] Further, the fine positioning mechanism includes a second base fixedly connected to the side of the first base. A bracket is fixedly installed on the second base, and the four CCD cameras are installed on the bracket.

[0013] Further, the conveying mechanism includes a third base installed on the side of the second base. A linear movement unit is installed on the third base. The linear movement unit penetrates through the pre-positioning mechanism and the conveying mechanism. The linear movement unit includes a first motor installed on the third base. A lead screw is fixedly installed at the output end of the first motor, and a sliding block is installed on the lead screw in a threaded transmission manner.

[0014] Further, a slide rail is installed on the third base. The sliding block is slidably installed on the slide rail. A bottom plate is fixedly installed between the four sliding blocks. The sliding block is fixedly connected to the bottom surface of the bottom plate, and the second motor is installed on the bottom plate.

[0015] Further, the conveying mechanism includes a third base installed on the side of the fine positioning mechanism. Second cylinders are fixedly installed at the four corners of the third base. A connecting rod is connected between the output ends of the two vertically arranged second cylinders. Fixed clamping seats are installed on the sides of the two connecting rods. The fixed clamping seats have clamping grooves. A screen printing stencil is supported and placed in the two clamping grooves. Multiple nuts are threadedly connected to the fixed clamping seats.

[0016] Further, two symmetrically arranged oil knife cylinders are installed on the two side surfaces of the conveying mechanism. The oil knife body is installed at the output end of the oil knife cylinder. Scraping knife cylinders are fixedly installed on both sides of the conveying mechanism. A scraping knife holder is fixedly installed at the output end of the scraping knife cylinder. The oil knife module is installed on the scraping knife holder.

[0017] Further, a mechanical hand gripper is fixedly installed on one side of the third base. An out-feeding mechanism is fixedly installed on one side of the mechanical hand gripper. The out-feeding mechanism and the pre-positioning mechanism have a similar structure.

[0018] The beneficial effects of this application are as follows: A curved glass screen printer provided by this application sets a partition at the bottom of the screen printing stencil and at a position with a certain distance from the printing area to generate a slight upward extrusion force on the screen printing stencil, thereby accelerating the separation of the curved glass from the printing plate of the screen printing stencil, so that the curved glass and the printing plate of the screen printing stencil are vertically separated in time, avoiding the inclined separation phenomenon caused by the adhesion between the two, effectively protecting the ink already printed on the surface of the curved glass, and avoiding problems such as local displacement, smudging, and edge blurring of the ink, ensuring the stability and reliability of the printing quality.

[0019] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The following will further elaborate on the present application with reference to the drawings. Brief Description of the Drawings

[0020] The schematic drawings of the specification forming a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 is the overall schematic diagram of a curved glass screen printing machine in the present application;

[0022] Figure 2 is Figure 1 the partial structural schematic diagram of

[0023] Figure 3 is Figure 2 the enlarged schematic diagram of area A in

[0024] Figure 4 is Figure 1 the structural schematic diagram of the conveying assembly of

[0025] Figure 5 is Figure 4 the bottom structural schematic diagram of

[0026] Figure 6 is Figure 5 the enlarged schematic diagram of area B in

[0027] Figure 7 is Figure 1 the partial structural schematic diagram of the conveying mechanism in

[0028] Figure 8 is Figure 7 the partial structural schematic diagram of

[0029] Figure 9 is Figure 8 the structural schematic diagram of the anti-abrasion mechanism of

[0030] Figure 10 is Figure 9 the enlarged schematic diagram of area C in

[0031] Among them, the reference numerals in the drawings:

[0032] 1. Pre-positioning mechanism; 101. First base; 102. First guide rail; 103. First mounting seat; 104. First cylinder; 105. Second guide rail; 106. Mounting plate; 107. Positioning block; 108. Third guide rail; 109. Slide block; 110. Mounting frame; 111. Photoelectric sensor;

[0033] 2. Fine positioning mechanism; 201. Second base; 202. Bracket; 203. CCD camera;

[0034] 3. Conveyor mechanism; 301. Third base; 302. Slide rail; 303. First motor; 304. Lead screw; 305. Sliding block; 306. Base plate; 307. Second motor; 308. Die fixture; 309. Second cylinder; 310. Connecting rod; 311. Chain linear conveyor module; 312. Second mounting seat; 313. Fixed clamp seat; 316. Scraper cylinder; 317. Oil knife cylinder; 319. Oil knife body; 320. Scraper holder; 321. Curved knife servo; 323. Nut; 324. Screen printing stencil;

[0035] 4. Manipulator gripper;

[0036] 5. Sheet discharging mechanism;

[0037] 7. Anti-abrasion mechanism; 701. Connecting frame; 702. Seat body; 703. Partition board; 704. Leakage hole; 705. Collection hopper; 706. Valve; 707. Support bracket. Detailed implementation manners

[0038] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0040] Embodiment 1: This embodiment elaborates on the structure and working principle of a curved glass screen printer. Specifically:

[0041] As Figures 1-4As shown, the present application provides a curved glass screen printer, including a pre-positioning mechanism 1. The pre-positioning mechanism 1 includes a first base 101, and at positions near both ends on the first base 101, first guide rails 102 are fixedly installed. Two groups of first mounting seats 103 are slidably installed on the first guide rails 102. The first mounting seats 103 can be fixed to the first guide rails 102 by bolts, and the first mounting seats 103 can slide along the linear direction of the first guide rails 102 to change the positions of the first mounting seats 103 on the first guide rails 102. A first cylinder 104 is fixedly installed on the first mounting seats 103. When the first cylinder 104 is activated, its output end will produce a telescopic action;

[0042] And a second guide rail 105 is connected and installed at the output ends of the two groups of first cylinders 104. Thus, when the output ends of the first cylinders 104 telescope, the second guide rail 105 will be driven to perform a linear motion. And to ensure the stability of the movement of the second guide rail 105, two groups of guide rods (not marked in the figure) are fixedly installed at positions on both sides of the first cylinders 104 on the second guide rail 105. The guide rods movably penetrate through the first mounting seats 103. During the movement of the second guide rail 105, the guide rods play a role in auxiliary support and stable guidance, effectively reducing the shaking and deviation generated when the second guide rail 105 moves, and ensuring the smoothness and accuracy of its movement;

[0043] At the same time, a mounting plate 106 is fixedly installed on the second guide rail 105. The mounting plate 106 moves synchronously with the second guide rail 105. At the same time, a positioning block 107 is fixedly installed on the mounting plate 106. Before screen printing the curved glass, by controlling the telescopic length and speed of the output end of the first cylinder 104, the position of the positioning block 107 is accurately adjusted, and the curved glass is positioned by using the positioning block 107 to ensure that the glass is in the accurate position during screen printing;

[0044] And two groups of third guide rails 108 are also fixedly installed at positions near both sides on the first base 101. Two groups of sliders 109 are slidably installed on the third guide rails 108. And a mounting frame 110 is fixedly installed on the four groups of sliders 109. Due to the cooperation between the sliders 109 and the third guide rails 108, the mounting frame 110 can slide along the direction of the third guide rails 108. At the same time, a photoelectric sensor 111 is fixedly installed on the mounting frame 110;

[0045] When the curved glass is automatically conveyed from the front-end production line to the pre-positioning area, the entire positioning process starts. As the glass approaches continuously, the photoelectric sensor 111 operates based on the optical induction principle inside it. When the curved glass enters the sensing range of the photoelectric sensor 111 and blocks the light propagation path, the photoelectric sensor 111 will quickly capture this light change signal. Then, the first cylinder 104 drives the second guide rail 105, mounting plate 106, and positioning block 107 connected to the output end to move towards the glass direction to align the curved glass in the conveying direction and ensure the accurate position of the glass in the X direction;

[0046] And a fine positioning mechanism 2 is installed on one side of the first base 101. The fine positioning mechanism 2 includes a second base 201 fixedly connected to the side of the first base 101. A bracket 202 is fixedly installed on the second base 201, and four groups of CCD cameras 203 are fixedly installed on the bracket 202. Based on its photoelectric conversion principle, the photosensitive elements inside the CCD cameras 203 will convert the optical images of the curved glass and the mold fixture into electrical signals, and then form digital image information. These image information will be transmitted to the industrial control computer as the basic data for subsequent precise positioning;

[0047] As Figures 4-6 shown, a conveying mechanism 3 is installed on the side of the second base 201. The conveying mechanism 3 is used to convey the glass after pre-positioning. The conveying mechanism 3 includes a third base 301 fixedly installed on the side of the second base 201, and a linear movement unit is installed on the third base 301. The linear movement unit penetrates through the pre-positioning mechanism 1 and the conveying mechanism 3. The linear movement unit includes a first motor 303 fixedly installed on the third base 301, and a lead screw 304 is fixedly installed at the output end of the first motor 303. The lead screw 304 is adapted to rotate with the output end of the first motor 303, and a sliding block 305 is threadedly installed on the lead screw 304. The sliding block 305 is adapted to rotate with the lead screw 304 and move linearly along the axial direction of the lead screw 304;

[0048] To ensure the stability of the movement of the sliding block 305, slide rails 302 are fixedly installed on both sides of the lead screw 304 on the third base 301. The sliding block 305 is slidably installed on the slide rails 302, and a bottom plate 306 is fixedly installed between the four groups of sliding blocks 305. The sliding block 305 is fixedly connected to the bottom surface of the bottom plate 306. Thus, when the lead screw 304 drives the sliding block 305 in threaded cooperation with it to move, the sliding block 305 on the slide rails 302 will move together. The slide rails 302 provide guiding and supporting functions for the movement of the sliding block 305, reducing the shaking and deviation of the sliding block 305 during the movement process and ensuring the smoothness of the entire movement process;

[0049] And a second motor 307 is fixedly installed on the bottom plate 306, and a die fixture 308 is fixedly installed at the output end of the second motor 307. The die fixture 308 is adapted to place the glass. The die fixture 308 is designed with a vacuum adsorption function. It can be understood that (by arranging vacuum suckers on the die fixture 308, the glass is adsorbed on the fixture and does not move during printing). At the same time, the die fixture 308 is adapted to rotate along with the output end of the second motor 307 and automatically rotate within the angular range of 15° to -15°, so as to adjust the angle of the glass placed on the die fixture 308;

[0050] After positioning is completed, use the manipulator gripper (or suction cup) to transport the pre-positioned curved glass to the die fixture 308. The CCD camera 203 automatically takes pictures. After taking pictures, the industrial control computer compares the position of the curved glass on the die with the reference position of the screen plate, calculates the deviation value in the X direction, the deviation value in the Y direction, and the deviation value of the rotation angle respectively, and then re-positions. After positioning is completed, the CCD camera 203 takes pictures for the second time to check again whether the positioning accuracy is within the set accuracy range. If the accuracy reaches, the system issues a positioning completion instruction, otherwise re-position;

[0051] After positioning is completed, by using the method of driving the lead screw 304 to drive by the first motor 303, the movement of the sliding block 305 can be accurately controlled, and the sliding block 305 drives the glass and the die fixture 308 to move rapidly to the specified position to the right;

[0052] As Figures 7-9 shown, second cylinders 309 are fixedly installed at the four corner positions of the third base 301, and a connecting rod 310 is connected between the output ends of the two vertically arranged second cylinders 309 (refer to Figure 7 ), and fixed clamp seats 313 are fixedly installed on the sides of the two connecting rods 310. The fixed clamp seats 313 have clamping grooves (not marked in the figure), and a screen printing screen plate 324 is supported and placed in the two clamping grooves. And a plurality of nuts 323 are threadedly connected to the fixed clamp seats 313. One end of the nut 323 penetrates through the upper surface of the fixed clamp seat 313 to be suitable for screwing tightly and fixing the screen printing screen plate 324 between the two fixed clamp seats 313;

[0053] And a chain linear conveying module 311 is fixedly installed on the two connecting rods 310. The chain linear conveying module 311 has a second mounting seat 312 that can slide linearly. And the chain linear conveying module 311 is a conventional linear conveying module in the art. It is a common linear conveying device in the art, and its internal usually consists of components such as chains, sprockets, and driving motors. When the driving motor is started, the sprocket drives the chain to rotate, and the rotation of the chain drives the connected second mounting seat 312 to slide linearly along the preset linear track;

[0054] And on both sides of the second mounting seat 312, two sets of symmetrically arranged oil knife cylinders 317 are fixedly installed. The working principle of the oil knife cylinder 317 is similar to that of the second cylinder 309, and an oil knife body 319 is fixedly installed at the output end of the oil knife cylinder 317. The oil knife body 319 is adapted to perform telescopic movement along with the output end of the oil knife cylinder 317;

[0055] Thus, when the oil knife cylinder 317 receives a control signal, its output end expands and contracts. Since the oil knife body 319 is fixedly installed at the output end of the oil knife cylinder 317, the oil knife body 319 will perform synchronous telescopic movement along with the expansion and contraction of the output end of the oil knife cylinder 317. Thus, during the screen printing process, by controlling the expansion and contraction of the oil knife cylinder 317, the oil knife body 319 can be brought into contact with or separated from the screen printing stencil 324 and the glass surface;

[0056] At the same time, the oil knife body 319 can move synchronously along with the movement on the second mounting seat 312 to drive the oil knife body 319 to be transported to different positions required on the screen printing stencil 324, so as to infiltrate the ink at one end of the screen printing stencil 324 into the mesh holes of the screen printing stencil 324;

[0057] Such as Figures 9-10 As shown, scraping knife cylinders 316 are fixedly installed on both sides of the second mounting seat 312, and a scraping knife holder 320 is fixedly installed at the output end of the scraping knife cylinders 316. An oil knife module is installed on the scraping knife holder 320. The oil knife module is divided into three major parts: front, rear, and middle to segmentally control the bending of the printing scraping knife. Among them, the oil knife module includes a first scraping knife part fixedly installed at the middle position of the scraping knife holder 320 and with a length of 300 mm. The first scraping knife part plays a role of basic support and partial printing in the entire oil knife module;

[0058] And four sets of second scraping knife parts and third scraping knife parts for controlling the curvature of the scraping knife by the bending knife servo 321 are designed respectively in front of and behind the first scraping knife part. The bending knife servo 321 is fixedly installed on the scraping knife holder 320. During the printing process, the second scraping knife part and the third scraping knife part automatically adjust the scraping knife pressure according to the curvature of the glass in the Y direction by the bending knife servo 321 to ensure that the scraping knife and the glass achieve equal torque operation during the printing movement, achieving a full printing effect on the Y-direction glass curved surface;

[0059] At the same time, the arrangement of the second cylinder 309 enables the entire chain linear conveying module 311, the oil knife system and the scraper system to be conveniently adjusted in height. When facing glass of different thicknesses or screen printing processes with different height requirements, the height position of the oil knife body 319 and the scraper part can be adjusted by controlling the second cylinder 309, thereby improving the versatility and adaptability of the equipment. At the same time, the chain linear conveying module 311 can realize the linear sliding of the second mounting seat 312, thereby ensuring that the oil knife body 319 and the scraper part move on the screen printing screen 324 according to a predetermined path, thereby ensuring the straightness and accuracy of the screen printing pattern;

[0060] In addition, a robot gripper 4 is fixedly installed on one side of the third base 301, and the robot gripper 4 can transport the curved glass after printing. At the same time, a sheet discharging mechanism 5 is fixedly installed on one side of the robot gripper 4. The sheet discharging mechanism 5 and the pre-positioning mechanism 1 have similar structures. The sheet discharging mechanism 5 is used to temporarily place the curved glass after printing, so as to facilitate the subsequent further processing or storage of the glass.

[0061] Embodiment 2: After the printing process is completed at the designated position of the curved glass, the printing platform starts to drive the curved glass to rotate. At the same time, the position on the curved glass where the printing is completed gradually separates from the screen printing screen 324, and the relative position between the two continues to change. In this dynamic process, if the separation speed between the two is slow, the glass surface and the screen printing screen 324 may be tilted and separated, which may cause friction between the two, resulting in slight scratches between the curved glass and the screen printing screen 324, thereby generating a rubbing effect. This rubbing will affect the ink that has been printed on the surface of the curved glass, which may cause local displacement, rubbing, blurred edges and other problems of the ink;

[0062] In order to solve the above problems, Figures 9-10 As shown, an anti-rubbing mechanism 7 is installed on the second mounting seat 312, and the anti-rubbing mechanism 7 includes a connecting frame 701 fixedly installed on both sides of the second mounting seat 312, and a seat body 702 is fixedly installed at one end of the connecting frame 701, and a partition plate 703 is fixedly installed between the two sets of seat bodies 702;

[0063] For ease of understanding, the main part of the screen printing screen 324 is divided into a frame in the outer circle and the screen printing screen 324 in the middle, and along the direction of the scraper part moving forward, the frames on both sides are defined as a starting frame and a tail frame respectively. In the initial state, the scraper part is located at the upper end of the starting frame, so that when the scraper part is working, it moves from the starting frame of the screen printing screen 324 to the tail frame via the screen printing screen 324 to scrape the ink from the mesh of the screen printing screen 324 onto the curved glass;

[0064] Meanwhile, the partition plate 703 is located at the lower end of the starting frame and has a certain horizontal distance from the squeegee part, that is, the partition plate 703 is adapted to move synchronously with the squeegee part and lags behind the squeegee part in position;

[0065] It can be understood that since the curved glass is in a continuous rotating state and the partition plate 703 is at a certain distance from the screen printing area, the partition plate 703 can be in front of the screen printing stencil 324 and the curved glass while maintaining a certain distance and will not affect the printing of the curved glass;

[0066] Meanwhile, the upper surface of the partition plate 703 has an elastic end and contacts the bottom of the starting frame. Thus, in the initial state, the elastic end of the partition plate 703 is located at the bottom of the starting frame and is compressed. When the partition plate 703 lags behind and moves to the bottom of the screen printing stencil 324 along with the squeegee part, due to the restoring force of the elastic end, it will contact the screen printing stencil 324 and generate an upward squeezing force on the screen printing stencil 324;

[0067] Thus, when the squeegee part starts to move linearly along with the second mounting seat 312 on the chain linear conveying module 311, the anti-friction mechanism 7 is also activated synchronously. Since the partition plate 703 is tightly connected to the second mounting seat 312 through the connecting frame 701 and the seat body 702, the partition plate 703 will move synchronously with the squeegee part. During the movement, the squeegee part undertakes the task of printing the ink in the mesh holes of the screen printing stencil 324 onto the curved glass. The squeegee part applies an appropriate pressure to scrape the ink evenly through the mesh holes of the screen printing stencil 324, so that the ink adheres to the surface of the curved glass to complete the printing process.

[0068] For the printed area after screen printing, as the second mounting seat 312 continues to move linearly, the lagging partition plate 703 will contact the screen printing stencil 324 from the bottom and generate a slight upward squeezing force on the screen printing stencil 324. Since there is a certain horizontal distance between the squeegee part and the partition plate 703, the above squeezing force can quickly and effectively separate the screen printing stencil 324 from the curved glass at the printing position and will not affect the printing work of the squeegee part;

[0069] Therefore, during the dynamic process of the curved glass rotating and approaching and separating from the printing plate of the screen printing stencil 324, due to the extrusion of the squeegee part and the viscosity of the ink, the local screen printing stencil 324 may have a slower separation speed after printing. The setting of the partition plate 703 can generate a slight upward extrusion force on the screen printing stencil 324 at the bottom of the screen printing stencil 324 and at a certain distance from the printing area, thereby accelerating the separation of the curved glass from the printing plate of the screen printing stencil 324, enabling the curved glass to be vertically separated from the printing plate of the screen printing stencil 324 in a timely manner, avoiding the inclined separation phenomenon caused by the sticking of the two, effectively protecting the ink already printed on the surface of the curved glass, and avoiding problems such as local displacement, smudging, and edge blurring of the ink, ensuring the stability and reliability of the printing quality;

[0070] In this embodiment, a buffer area is provided at the position where the screen printing stencil 324 is close to the starting frame. This buffer area enables the partition plate 703 to be located at the lower end of the screen printing stencil 324 when the curved glass is being printed, so that the function of the partition plate 703 can cover the entire screen printing process, and thus the printing quality can be guaranteed;

[0071] More preferably, since the partition plate 703 contacts the bottom of the screen printing stencil 324 and lags behind the squeegee part, the ink remaining on the bottom of the screen printing stencil 324 can be scraped off by the partition plate 703, thereby avoiding the risk of excess ink dripping onto the curved glass and further ensuring the printing quality.

[0072] After the partition plate 703 has been working continuously for a long time, the ink accumulated on the partition plate 703 will continue to increase. Since the ink has a certain fluidity, it is likely to fall onto the curved glass, which will affect the printing quality;

[0073] To solve the above problems, as Figures 9-10 shown, a plurality of groups of leakage holes 704 are equidistantly arranged on the partition plate 703. The leakage holes 704 can convey the ink accumulated on the partition plate 703. A collecting hopper 705 is connected and installed at the bottom of the partition plate 703. The collecting hopper 705 can collect and process the ink flowing out from the leakage holes 704. Valves 706 are connected and installed at both ends of the collecting hopper 705. The valves 706 are used to regularly discharge the ink collected in the collecting hopper 705. At the same time, a support bracket 707 for supporting the valves 706 is fixedly installed at the bottom of the seat body 702. By providing the leakage holes 704 and the collecting hopper 705, the problem of ink accumulation on the partition plate 703 is solved. By collecting and regularly discharging the ink, the ink is prevented from falling onto the curved glass due to its fluidity, maintaining a good printing environment and ensuring the continuous stability of the printing quality.

[0074] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A curved glass screen printer, characterized in that: include: A pre-positioning mechanism (1), the pre-positioning mechanism (1) having four groups of positioning blocks (107) for initially positioning the curved glass, and a first cylinder (104) for driving the positioning blocks (107) to approach the curved glass; a fine positioning mechanism (2), the fine positioning mechanism (2) having four groups of CCD cameras (203) for fine positioning the curved glass; a conveying mechanism (3), the conveying mechanism (3) having a fetal membrane fixture (308) for adjusting the angle of the curved glass, and a second motor (307) for driving the fetal membrane fixture (308) to rotate, and an oil knife body (319) for initially covering the ink on the mesh of the silk screen printing screen, and an oil knife module for printing on the curved glass, the oil knife module comprising a first scraper portion fixedly mounted at a middle position of a scraper frame (320), and a second scraper portion and a third scraper portion respectively arranged in front of and behind the first scraper portion, the scraper curvature being controlled by a curved knife servo (321), and a control mechanism for controlling the oil knife body (319). and a chain linear conveying module (311) for moving the oil knife module along the direction of the silk screen printing screen, the chain linear conveying module (311) having a second mounting seat (312) capable of linear sliding; an anti-friction mechanism (7), the anti-friction mechanism (7) being mounted on the second mounting seat (312), the anti-friction mechanism (7) comprising: a connecting frame (701), the connecting frame (701) being mounted on the second mounting seat (312), a seat body (702) being mounted at one end of the connecting frame (701), a partition (703) being mounted between two groups of the seat bodies (702), a certain horizontal distance being between the partition (703) and the scraper part, the partition (703) being located at the lower end of the silk screen printing screen; wherein: the partition (703) is suitable for contacting the silk screen printing screen from the bottom, generating a slight upward squeezing force on the silk screen printing screen, and being suitable for quickly and effectively separating the silk screen printing screen at the printing position from the curved glass.

2. The curved glass screen printing machine according to claim 1, characterized in that: The partition (703) is provided with a plurality of groups of leakage holes (704) at equal intervals. The bottom of the partition (703) is connected to a collecting bucket (705), and valves (706) are connected to both ends of the collecting bucket (705).

3. The curved glass screen printing machine according to claim 2, characterized in that: The pre-positioning mechanism (1) comprises a first base (101), a first guide rail (102) is installed near two ends of the first base (101), two groups of first mounting seats (103) are installed on the first guide rail (102), a first cylinder (104) is installed on the first mounting seat (103), the output ends of the two groups of first cylinders (104) are connected to the second guide rail (105), a mounting plate (106) is installed on the second guide rail (105), and the positioning block (107) is installed on the mounting plate (106).

4. The curved glass screen printing machine according to claim 3, characterized in that: Two groups of third guide rails (108) are installed near two sides of the first base (101), two groups of sliders (109) are slidably installed on the third guide rails (108), mounting frames (110) are fixedly installed on the four groups of sliders (109), and photoelectric sensors (111) are installed on the mounting frames (110).

5. The curved glass screen printing machine according to claim 4, characterized in that: The precise positioning mechanism (2) comprises a second base (201) fixedly connected to the side of the first base (101), a bracket (202) fixedly mounted on the second base (201), and four groups of CCD cameras (203) mounted on the bracket (202).

6. The curved glass screen printing machine according to claim 5, characterized in that: The conveying mechanism (3) comprises a third base (301) mounted on the side of the second base (201), a linear moving unit being mounted on the third base (301), the linear moving unit being arranged to penetrate the pre-positioning mechanism (1) and the conveying mechanism (3), the linear moving unit comprising a first motor (303) mounted on the third base (301), a lead screw (304) being fixedly mounted on the output end of the first motor (303), and a sliding block (305) being threadedly mounted on the lead screw (304).

7. The curved glass screen printing machine according to claim 6, characterized in that: A slide rail (302) is installed on the third base (301), the sliding block (305) is slidably installed on the slide rail (302), a bottom plate (306) is fixedly installed between the four groups of sliding blocks (305), the sliding blocks (305) are fixedly connected to the bottom surface of the bottom plate (306), and the second motor (307) is installed on the bottom plate (306).

8. The curved glass screen printing machine according to claim 7, characterized in that: The conveying mechanism (3) comprises a third base (301) mounted on the side of the fine positioning mechanism (2), second cylinders (309) are fixedly mounted at the four corners of the third base (301), connecting rods (310) are connected between the output ends of two groups of vertically arranged second cylinders (309), fixed clamping seats (313) are mounted on the sides of the two groups of connecting rods (310), the fixed clamping seats (313) have clamping grooves, and the two groups of clamping grooves support and place silk screens (324), and the fixed clamping seats (313) are threadedly connected to multiple groups of nuts (323).

9. The curved glass screen printing machine according to claim 8, characterized in that: Two groups of symmetrically arranged oil knife cylinders (317) are mounted on the two side surfaces of the second mounting seat (312); the oil knife body (319) is mounted on the output end of the oil knife cylinder (317); scraper cylinders (316) are fixedly mounted on both sides of the second mounting seat (312); a scraper frame (320) is fixedly mounted on the output end of the scraper cylinder (316); and the oil knife module is mounted on the scraper frame (320).

10. The curved glass screen printing machine according to claim 9, characterized in that: A manipulator gripper (4) is fixedly mounted on one side of the third base (301), and a sheet discharging mechanism (5) is fixedly mounted on one side of the manipulator gripper (4); the sheet discharging mechanism (5) and the pre-positioning mechanism (1) are of similar structure.

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