Curved surface glass screen printing machine

Abstract

The invention discloses a curved surface glass screen printing machine, and belongs to the technical field of screen printing machines. The device mainly comprises a pre-positioning mechanism, wherein the pre-positioning mechanism is provided with four groups of positioning blocks for primarily positioning the curved glass; the fine positioning mechanism is provided with four groups of CCD (Charge Coupled Device) cameras for performing fine positioning on the curved glass; the conveying mechanism is provided with a tire film jig for adjusting the angle of the curved glass, an oil knife body for initially covering printing ink to meshes of the screen printing plate, and an oil knife module for printing the curved glass; the anti-abrasion mechanism comprises a connecting frame, base bodies are installed at one end of the connecting frame, a partition plate is installed between the two base bodies, and a certain horizontal distance is formed between the partition plate and the scraper part. According to the curved-surface glass screen printing machine, the partition plate is arranged to generate upward slight extrusion force on the screen printing plate, separation of curved-surface glass and the screen printing plate is accelerated, and the inclined separation phenomenon caused by adhesion of the curved-surface glass and the screen printing plate is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of screen printing machines, and in particular to a curved glass screen printing machine. Background Art

[0002] A screen printer is a device that uses a screen printing plate as a base plate and uses the basic principle that the mesh holes of the screen printing plate with images and texts can pass through the ink, while the mesh holes of the non-image and text parts cannot pass through the ink. Screen printing consists of five elements: screen printing plate, scraper, ink, printing table and substrate. When printing, pour ink on one end of the screen printing plate, use the scraper to apply a certain pressure on the ink part and move it to the other end. The ink is squeezed from the mesh of the image part to the substrate by the scraper.

[0003] When printing on curved glass, place the curved glass on the printing platform of the screen printer and fit it tightly to the printing platform. Then pour a proper amount of prepared ink on one end of the screen printing plate, start the screen printer, and move the scraper 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, and the rotation angle automatically rotates between 15° and -15°, so that the curved glass on the printing platform is always in contact with the printing screen. The scraper continues to move at a certain speed and pressure, and the ink is evenly transferred to the surface of the curved glass through the mesh of the screen printing plate to complete the printing of patterns and texts. However, when the printing position of the curved glass is completed, the printing platform drives the curved glass to rotate, and when the curved glass gradually moves away from the screen printing plate, the relative position between the two changes. In this process, due to the continuous rotation of the curved glass, when the printed curved glass surface and the screen printing plate are separated, the contact angle between the screen printing plate and the curved glass surface changes from a vertical state to an inclined state, which may cause the printed curved glass and the screen printing plate to be tilted and separated, and there may be a certain amount of friction between the two, resulting in slight scratches between the curved glass and the printing plate, thereby causing friction, and further affecting the ink that has been printed on the curved glass. Therefore, it is necessary to provide a curved glass screen printing machine to solve the above problems.

[0004] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0005] Based on the above problems existing in the prior art, the problem to be solved by the present application is: to provide a curved glass screen printing machine, which realizes pushing the screen printing screen through the partition, avoids contact and scratching between the glass and the printing plate, protects the ink, and ensures stable and reliable printing quality.

[0006] The technical solution adopted by the present application to solve its technical problems is: a curved glass screen printing machine, including: a pre-positioning mechanism, the pre-positioning mechanism has four groups of positioning blocks for initial positioning of the curved glass, and a first cylinder for driving the positioning blocks to approach the curved glass; a fine positioning mechanism, the fine positioning mechanism has four groups of CCD cameras for fine positioning of the curved glass; a conveying mechanism, the conveying mechanism has a fetal membrane fixture for adjusting the angle of the curved glass, and a second motor for driving the fetal membrane fixture to rotate, and an oil knife body for initially covering the ink to the mesh of the silk screen, and an oil knife module for printing on the curved glass, the oil knife module including a first scraper portion fixedly installed in the middle position of the scraper frame and two sets of scrapers arranged in front and behind the first scraper portion. A second scraper portion and a third scraper portion whose scraper curvature is controlled by a curved blade servo, and a chain linear conveying module that controls the movement of the oil knife body and the oil knife module along the direction of the silk screen; an anti-friction mechanism, which is installed on the precise positioning mechanism, and the anti-friction mechanism comprises: a connecting frame, which is installed on the precise positioning mechanism, a seat body is installed at one end of the connecting frame, a partition is installed between two groups of the seat bodies, a certain horizontal distance is between the partition and the scraper portion, and the partition is at the lower end of the silk screen; wherein: the partition is suitable for contacting the silk screen from the bottom, and generating a slight upward squeezing force on the silk screen, and is suitable for quickly and effectively separating the silk screen at the printing position from the curved glass.

[0007] Furthermore, a plurality of leakage holes are arranged at equal distances on the partition, a collecting hopper is connected to the bottom of the partition, and valves are connected to both ends of the collecting hopper.

[0008] Furthermore, the positioning mechanism includes a first base, a first guide rail is installed on the first base near both ends, two groups of first mounting seats are installed on the first guide rail, a first cylinder is installed on the first mounting seat, the output ends of the two groups of first cylinders are connected and installed with a second guide rail, a mounting plate is installed on the second guide rail, and the positioning block is installed on the mounting plate.

[0009] Furthermore, two groups of third guide rails are installed near two sides of the first base, two groups of sliders are slidably installed on the third guide rails, mounting frames are fixedly installed on the four groups of sliders, and photoelectric sensors are installed on the mounting frames.

[0010] Furthermore, the precise positioning mechanism comprises a second base fixedly connected to a side of the first base, a bracket is fixedly mounted on the second base, and the four groups of CCD cameras are mounted on the bracket.

[0011] Furthermore, the conveying mechanism includes a third base installed on the side of the second base, a linear moving unit is installed on the third base, the linear moving unit runs through the pre-positioning mechanism and the conveying mechanism, the linear moving unit includes a first motor installed on the third base, a screw is fixedly installed on the output end of the first motor, and a sliding block is threadedly installed on the screw.

[0012] Furthermore, 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 groups of 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.

[0013] Furthermore, the conveying mechanism includes a third base installed on the side of the precision positioning mechanism, and the second cylinder is fixedly installed at the four corners of the third base. A connecting rod is connected between the output ends of the two groups of vertically arranged second cylinders, and a fixed clamp seat is installed on the sides of the two groups of connecting rods. The fixed clamp seat has a clamping groove, and the silk screen is supported and placed in the two groups of clamping grooves, and multiple groups of nuts are threadedly connected to the fixed clamp seat.

[0014] Furthermore, two groups of symmetrically arranged oil knife cylinders are installed on both sides of the conveying mechanism, the oil knife body is installed at the output end of the oil knife cylinder, scraper cylinders are fixedly installed on both sides of the conveying mechanism, a scraper frame is fixedly installed at the output end of the scraper cylinder, and the oil knife module is installed on the scraper frame.

[0015] Furthermore, a robot gripper is fixedly mounted on one side of the third base, a sheet discharging mechanism is fixedly mounted on one side of the robot gripper, and the sheet discharging mechanism and the pre-positioning mechanism are similar structures.

[0016] The beneficial effect of the present application is that a curved glass screen printing machine provided by the present application generates a slight upward squeezing force on the screen printing screen by setting a partition at the bottom of the screen printing screen at a certain distance from the printing area, thereby accelerating the separation of the curved glass from the screen printing screen printing plate, so that the curved glass and the screen printing screen printing plate are separated vertically in time, avoiding the tilted separation phenomenon caused by the stickiness of the two, thereby effectively protecting the ink that has been printed on the surface of the curved glass, avoiding local displacement, smearing, edge blurring and other problems of the ink, and ensuring the stability and reliability of the printing quality.

[0017] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is an overall schematic diagram of a curved glass screen printing machine in this application; Figure 2 for Figure 1 Schematic diagram of the local structure; Figure 3 for Figure 2 A magnified schematic diagram of the middle A area; Figure 4 for Figure 1 A schematic diagram of the conveying component structure; Figure 5 for Figure 4 Schematic diagram of the bottom structure; Figure 6 for Figure 5 A magnified schematic diagram of the middle B area; Figure 7 for Figure 1 Schematic diagram of the partial structure of the conveying mechanism; Figure 8 for Figure 7 Schematic diagram of the local structure; Fig. 9 for Figure 8 Schematic diagram of the anti-friction mechanism structure; Fig.10 for Fig. 9 Enlarged schematic diagram of the middle C area; Among them, the reference numerals in the figure are: 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. Slider; 110. Mounting frame; 111. Photoelectric sensor; 2. Precision positioning mechanism; 201. Second base; 202. Bracket; 203. CCD camera; 3. Conveying mechanism; 301. Third base; 302. Slide rail; 303. First motor; 304. Screw rod; 305. Sliding block; 306. Bottom plate; 307. Second motor; 308. Fetal membrane fixture; 309. Second cylinder; 310. Connecting rod; 311. Chain linear conveying module; 312. Second mounting seat; 313. Fixed clamp seat; 316. Scraper cylinder; 317. Oil knife cylinder; 319. Oil knife body; 320. Scraper holder; 321. Scimitar servo; 323. Nut; 324. Silk screen; 4. Robotic gripper; 5. Film production organization; 7. Anti-friction mechanism; 701. Connecting frame; 702. Seat body; 703. Partition plate; 704. Leak hole; 705. Collecting bucket; 706. Valve; 707. Support bracket. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution 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 part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] Embodiment 1: This embodiment describes the structure and working principle of a curved glass screen printer, specifically: like Figure 1-Figure 4 As shown, the present application provides a curved glass screen printing machine, including a pre-positioning mechanism 1, the pre-positioning mechanism 1 includes a first base 101, and a first guide rail 102 is fixedly installed near the two ends of the first base 101, and two groups of first mounting seats 103 are slidably installed on the first guide rail 102, the first mounting seats 103 can be fixed on the first guide rail 102 by bolts, and the first mounting seats 103 can slide along the straight direction of the first guide rail 102 to change the position of the first mounting seats 103 on the first guide rail 102, and a first cylinder 104 is fixedly installed on the first mounting seat 103, and when the first cylinder 104 is started, its output end will produce a telescopic action; The output ends of the two groups of first cylinders 104 are connected and installed with second guide rails 105, so that when the output ends of the first cylinders 104 are extended or retracted, the second guide rails 105 are driven to perform linear motion. In order to ensure the stability of the movement of the second guide rails 105, two groups of guide rods (not shown in the figure) are fixedly installed on the second guide rails 105 at both sides of the first cylinders 104. The guide rods are movable and penetrate the first mounting seat 103. During the movement of the second guide rails 105, the guide rods play the role of auxiliary support and stable guidance, which effectively reduces the shaking and deviation of the second guide rails 105 during movement, and ensures the stability and accuracy of its movement. Meanwhile, a mounting plate 106 is fixedly mounted on the second guide rail 105, and the mounting plate 106 moves synchronously with the second guide rail 105. Meanwhile, a positioning block 107 is fixedly mounted on the mounting plate 106. Before the curved glass is screen-printed, the position of the positioning block 107 is precisely adjusted by controlling the telescopic length and speed of the output end of the first cylinder 104, and the curved glass is positioned by the positioning block 107 to ensure that the glass is in an accurate position during screen printing; Two sets of third guide rails 108 are fixedly installed near the two sides of the first base 101, and two sets of sliders 109 are slidably installed on the third guide rails 108, and a mounting frame 110 is fixedly installed on the four sets 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, and a photoelectric sensor 111 is fixedly installed on the mounting frame 110; When the curved glass is automatically transported from the front-end production line to the pre-positioning area, the entire positioning process starts. As the glass approaches, the photoelectric sensor 111 works based on its internal optical sensing principle. When the curved glass enters the sensing range of the photoelectric sensor 111 and blocks the propagation path of the light, the photoelectric sensor 111 will quickly capture the light change signal, and then the first cylinder 104 drives the second guide rail 105 connected to the output end, the mounting plate 106 and the positioning block 107 to move toward the glass to align the curved glass in the conveying direction to ensure that the glass is accurately positioned in the X direction. A precision positioning mechanism 2 is installed on one side of the first base 101. The precision 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 element inside the CCD camera 203 will convert the optical image of the curved glass and the fetal membrane fixture into an electrical signal, thereby forming digital image information. These image information will be transmitted to the industrial computer as the basic data for subsequent precise positioning; like Figure 4-Figure 6As shown, a conveying mechanism 3 is installed on the side of the second base 201, and the conveying mechanism 3 is used to convey the glass after the pre-positioning is completed, and the conveying mechanism 3 includes a third base 301 fixedly installed on the side of the second base 201, and a linear moving unit is installed on the third base 301, and the linear moving unit runs through the pre-positioning mechanism 1 and the conveying mechanism 3. The linear moving unit includes a first motor 303 fixedly installed on the third base 301, and a screw rod 304 is fixedly installed on the output end of the first motor 303, and the screw rod 304 is suitable for rotating with the output end of the first motor 303, and a sliding block 305 is threadedly installed on the screw rod 304, and the sliding block 305 is suitable for rotating with the screw rod 304 and moving linearly along the axial direction of the screw rod 304; In order to ensure the stability of the movement of the sliding block 305, the sliding rails 302 are fixedly installed on the third base 301 at both sides of the screw rod 304, the sliding block 305 is slidably installed on the sliding 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, so that when the screw rod 304 drives the sliding block 305 threadedly matched therewith to move, the sliding block 305 on the sliding rail 302 will move together, and the sliding rail 302 provides a guide and support for the movement of the sliding block 305, reduces the shaking and deviation of the sliding block 305 during the movement, and ensures the stability of the entire movement process; A second motor 307 is fixedly mounted on the bottom plate 306, and a fetal membrane jig 308 is fixedly mounted on the output end of the second motor 307. The fetal membrane jig 308 is suitable for placing glass. The fetal membrane jig 308 is designed with a vacuum adsorption function. It can be understood that (by providing a vacuum suction cup on the fetal membrane jig 308, the glass is adsorbed on the jig and does not move during printing). At the same time, the fetal membrane jig 308 is suitable for rotating with the output end of the second motor 307 and automatically rotating within an angle range of 15° to -15°, thereby adjusting the angle of the glass placed on the fetal membrane jig 308; After the positioning is completed, the pre-positioned curved glass is moved to the fetal membrane fixture 308 by using the manipulator gripper (or suction cup), and the CCD camera 203 automatically takes a photo. After taking the photo, the industrial computer compares the position of the curved glass in the fetal membrane with the reference position of the screen, and calculates the deviation value in the X direction, the deviation value in the Y direction, and the deviation value of the rotation angle, and then repositions it. After the positioning is completed, the CCD camera 203 takes a second photo to check again whether the positioning accuracy is within the set accuracy range. If the accuracy reaches the system, the positioning completion instruction is issued, otherwise the positioning is performed again; After the positioning is completed, the movement of the sliding block 305 can be accurately controlled by using the first motor 303 to drive the screw rod 304, and the sliding block 305 drives the glass and fetal membrane fixture 308 to move rightward to the specified position at high speed; like Figure 7-Figure 9 As shown, second cylinders 309 are fixedly installed at the four corners of the third base 301, and connecting rods 310 are connected between the output ends of the two sets of vertically arranged second cylinders 309 (refer to Figure 7 ), and a fixing clamp seat 313 is fixedly installed on the side of the two groups of connecting rods 310, and the fixing clamp seat 313 has a clamping groove (not marked in the figure), and a screen printing screen 324 is supported and placed in the two groups of clamping grooves, and a plurality of groups of nuts 323 are threadedly connected to the fixing clamp seat 313, and one end of the nut 323 passes through the upper surface of the fixing clamp seat 313 to be suitable for tightening and fixing the screen printing screen 324 between the two groups of fixing clamp seats 313; A chain linear conveying module 311 is fixedly mounted on the two sets of connecting rods 310. The chain linear conveying module 311 has a second mounting seat 312 that can slide linearly. 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 interior is usually composed of a chain, a sprocket, a driving motor and other components. When the driving motor is started, the sprocket drives the chain to rotate, and the rotation of the chain drives the second mounting seat 312 connected thereto to slide linearly along a preset linear track. Two groups of symmetrically arranged oil knife cylinders 317 are fixedly mounted on both sides of the second mounting base 312. The working principle of the oil knife cylinders 317 is similar to that of the second cylinder 309. An oil knife body 319 is fixedly mounted on the output end of the oil knife cylinder 317. The oil knife body 319 is suitable for telescopic movement along with the output end of the oil knife cylinder 317. Therefore, when the oil knife cylinder 317 receives the control signal, its output end is extended and retracted. 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 extension and retraction motion with the extension and retraction of the output end of the oil knife cylinder 317. Therefore, during the screen printing process, the oil knife body 319 can be brought into contact with or separated from the screen printing screen 324 and the glass surface by controlling the extension and retraction of the oil knife cylinder 317. At the same time, the oil knife body 319 can move synchronously with the movement of the second mounting seat 312 to drive the oil knife body 319 to be transported to different required positions on the screen printing screen 324 to infiltrate the ink at one end of the screen printing screen 324 into the mesh of the screen printing screen 324; like Figure 9-10As shown, scraper cylinders 316 are fixedly mounted on both sides of the second mounting seat 312, and scraper holders 320 are fixedly mounted on the output ends of the scraper cylinders 316. An oil knife module is mounted on the scraper holders 320. The oil knife module is divided into three major parts, namely, front, rear and middle parts, to achieve bending control of the printing scraper in sections. The oil knife module includes a first scraper part fixedly mounted in the middle position of the scraper holder 320 and having a length of 300 mm. The first scraper part plays a role of basic support and partial printing in the entire oil knife module. Four sets of second and third scraper parts are designed in front and behind the first scraper part, and the scraper curvature is controlled by a curved blade servo 321. The curved blade servo 321 is fixedly mounted on the scraper frame 320. During the printing process, the second and third scraper parts automatically adjust the scraper pressure according to the curvature of the glass in the Y direction through the curved blade servo 321, ensuring that the scraper and the glass achieve equal torque operation during the printing movement process, so as to achieve a full printing effect on the Y-direction glass curved surface; 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; 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.

[0022] 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; In order to solve the above problems, Figure 9-10As 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; 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; Meanwhile, the partition plate 703 is located at the lower end of the starting frame and has a certain horizontal distance from the scraper portion, that is, the partition plate 703 is suitable for synchronous movement with the scraper portion, and its position lags behind the scraper portion; It is understandable that, because the curved glass is in a continuous rotating state and the partition 703 is at a certain distance from the screen printing area, the partition 703 can be located between the screen printing screen 324 and the curved glass while maintaining a certain distance, and will not affect the printing of the curved glass; At the same time, the upper surface of the partition 703 has an elastic end, and contacts with the bottom of the starting frame, so that in the initial state, the elastic end of the partition 703 is located at the bottom of the starting frame and is compressed. When the partition 703 moves to the bottom of the screen printing screen 324 with the lagging of the scraper part, the elastic end has a restoring force, so it contacts with the screen printing screen 324 and generates an upward squeezing force on the screen printing screen 324; Therefore, when the scraper unit 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 started synchronously. Since the partition 703 is closely connected to the second mounting seat 312 through the connecting frame 701 and the seat body 702, the partition 703 will keep moving synchronously with the scraper unit. During the movement, the scraper unit is responsible for printing the ink in the mesh of the silk screen 324 onto the curved glass. The scraper unit uses appropriate pressure to evenly scrape the ink through the mesh of the silk screen 324, so that the ink adheres to the surface of the curved glass, completing the printing process.

[0023] For the printing area where the screen printing is completed, as the second mounting seat 312 continues to move linearly, the lagging partition 703 will contact the screen printing plate 324 from the bottom and generate a slight upward squeezing force on the screen printing plate 324. Since there is a certain horizontal distance between the scraper part and the partition 703, the squeezing force can quickly and effectively separate the screen printing plate 324 at the printing position from the curved glass without affecting the printing work of the scraper part. Therefore, in the dynamic process of the curved glass rotating and approaching and separating from the screen printing screen 324, due to the squeezing of the scraper part and the viscosity of the ink, the screen printing screen 324 may be separated slowly after printing. The partition 703 can be arranged at the bottom of the screen printing screen 324 and at a certain distance from the printing area to generate a slight upward squeezing force on the screen printing screen 324, thereby accelerating the separation of the curved glass and the screen printing screen 324, so that the curved glass and the screen printing screen 324 are separated vertically in time, avoiding the inclined separation caused by the sticking of the two, thereby effectively protecting the ink that has been printed on the surface of the curved glass, avoiding the problems of local displacement, rubbing, and blurred edges of the ink, and ensuring the stability and reliability of the printing quality; In this embodiment, a buffer area is provided at a position of the screen printing screen 324 close to the starting frame, and the buffer area enables the partition 703 to be located at the lower end of the screen printing screen 324 when the curved glass is printed, so that the function of the partition 703 can cover the entire screen printing process, thereby ensuring the quality of printing; More preferably, because the partition 703 contacts the bottom of the screen printing plate 324 and lags behind the scraper portion, the ink retained at the bottom of the screen printing plate 324 can be scraped off by the partition 703, thereby avoiding the risk of excess ink dripping onto the curved glass, thereby further ensuring the quality of printing.

[0024] After the partition 703 has been working continuously for a long time, the ink accumulated on the partition 703 will continue to increase. Since the ink has a certain fluidity, it is easy to fall on the curved glass, thereby affecting the printing quality. In order to solve the above problems, Figure 9-10 As shown, a plurality of groups of leakage holes 704 are provided at equal intervals on the partition 703, and the leakage holes 704 can transport the ink accumulated on the partition 703, and a collecting hopper 705 is connected and installed at the bottom of the partition 703, and the collecting hopper 705 can collect and process the ink flowing out of the leakage holes 704, and valves 706 are connected and installed at both ends of the collecting hopper 705, and the valve 706 is used to discharge the ink collected in the collecting hopper 705 regularly, and a supporting bracket 707 for supporting the valve 706 is fixedly installed at the bottom of the seat body 702. The setting of the leakage holes 704 and the collecting hopper 705 solves the problem of ink accumulation on the partition 703, and by collecting and discharging the ink regularly, the ink is prevented from falling on the curved glass due to fluidity, thereby maintaining a good printing environment and ensuring the continuous stability of printing quality.

[0025] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in 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 the curved glass, the oil knife module comprising a first scraper portion fixedly mounted at a middle position of a scraper frame (320) and second scraper portions respectively arranged in front and rear of the first scraper portion, the scraper curvature being controlled by a curved knife servo (321). and a third scraper unit, and a chain linear conveying module (311) for controlling the oil knife body (319) and the oil knife module to move along the direction of the silk screen; an anti-friction mechanism (7), the anti-friction mechanism (7) being mounted on the precise positioning mechanism (2), the anti-friction mechanism (7) comprising: a connecting frame (701), the connecting frame (701) being mounted on the precise positioning mechanism (2), 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), the partition (703) being at a certain horizontal distance from the scraper unit, and the partition (703) being located at the lower end of the silk screen; wherein: the partition (703) is suitable for contacting the silk screen from the bottom, generating a slight upward squeezing force on the silk screen, and being suitable for quickly and effectively separating the silk 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 installed on both side surfaces of the conveying mechanism (3); the oil knife body (319) is installed at the output end of the oil knife cylinder (317); scraper cylinders (316) are fixedly installed on both sides of the conveying mechanism (3); a scraper frame (320) is fixedly installed at the output end of the scraper cylinder (316); and the oil knife module is installed 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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