Curved screen printing device for printing platform

Abstract

The utility model discloses a curved surface silk screen printing device for printing platform, including frame, the frame top is provided with curved surface platform mechanism and printing mechanism, the curved surface platform mechanism includes the mounting frame, is provided with the curved surface printing platform on the mounting frame top, the mounting frame surface is installed with the rotation structure, the frame top is provided with the air -exhaust structure, the curved surface printing platform surface is opened with a plurality of adsorption holes, the hollow design in the curved surface printing platform, the frame top is fixed with two installation platform, the installation platform top is fixed with the linear guide rail, the linear guide rail surface slidingly connected with the sliding block, the frame top is fixed with the electric jar, the electric jar one end is connected with the mounting frame surface fixedly, the sliding block top is fixedly connected with the mounting frame bottom. The utility model effectively solved the sticky net problem in the soft thin material silk screen printing, and the printing quality and production efficiency have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the technical field of screen printing equipment, specifically a curved surface screen printing device for a printing platform. Background Technology

[0002] Screen printing, as a mature pattern transfer technology, is widely used in the manufacture of electronic components such as semiconductor packaging, multilayer ceramic capacitors, and low-temperature co-fired ceramics due to its advantages such as simple process, low cost, and applicability to various functional pastes. In this field, it is often necessary to print metal circuit patterns with high precision on unsintered, soft, and easily deformable ceramic film preforms (such as alumina ceramic preforms). The preforms are typically extremely thin, have low mechanical strength, and require a high degree of stability in the printing process.

[0003] Currently, most screen printing equipment used in the industry is equipped with a flat printing platform. However, this structure has significant drawbacks when dealing with the aforementioned soft, thin green bodies: at the end of printing, due to the extremely small screen pitch (typically 0.5-3.0 mm), the separation angle between the flat screen and the flat platform is insufficient. The viscous paste generates strong adhesion between the screen and the green body, causing the green body to stick to the screen, a phenomenon known as "screen sticking." Although this can be mitigated by enhancing the platform's adhesion or laying breathable paper on the platform, the former easily leads to the green body's concavity and deformation, while the latter weakens the adhesion effect, offering limited improvement. Screen sticking directly causes green body scrap (scrapping rate exceeding 50%), increases the labor and time costs of cleaning the screen, and severely restricts production yield and efficiency. Therefore, the existing flat printing platform has become a major technical bottleneck for improving the printing quality and efficiency of semiconductor ceramic thin film green bodies. Utility Model Content

[0004] The purpose of this invention is to provide a curved screen printing device for a printing platform to solve the problems mentioned above.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a curved surface screen printing device for a printing platform, comprising a base, wherein a curved surface platform mechanism and a printing mechanism are provided on the top of the base. The curved platform mechanism includes a mounting frame, a curved printing platform mounted on top of the mounting frame, a rotating structure mounted on the surface of the mounting frame, an air extraction structure on the top of the base, multiple suction holes on the surface of the curved printing platform, a hollow interior design of the curved printing platform, two mounting platforms fixed on the top of the base, linear guide rails fixed on the top of the mounting platforms, sliders slidably connected to the surface of the linear guide rails, an electric cylinder fixed on the top of the base, one end of the electric cylinder being fixedly connected to the surface of the mounting frame, and the top of the slider being fixedly connected to the bottom of the mounting frame.

[0006] As a preferred embodiment of the curved screen printing device for a printing platform according to this utility model, the rotating structure of the mounting frame surface includes a drive motor, the drive motor is fixedly connected to the surface of the mounting frame, two seated bearings are fixedly fixed on the top of the mounting frame, a connecting shaft is fixedly connected to the inner ring of the seated bearing, one end of the connecting shaft is fixedly connected to the surface of the curved printing platform, and the output shaft of the drive motor is fixedly connected to one end of the connecting shaft on one side.

[0007] As a preferred embodiment of the curved screen printing device for printing platform of this utility model, the air extraction structure at the top of the base includes a vacuum device, the surface of the vacuum device is connected to an air extraction pipe, one end of the air extraction pipe is connected to the interior of the curved printing platform, and the surface of the mounting frame is provided with a clearance part for use with the air extraction pipe.

[0008] As a preferred embodiment of the curved screen printing device for printing platform of this utility model, the printing mechanism includes a lifting linear module, which is fixed to the top of the machine base. A horizontal linear module is fixed to the surface of the moving part of the lifting linear module. A connecting block is fixed to the surface of the moving part of the horizontal linear module. A squeegee assembly is fixed to the surface of the connecting block. Two L-shaped plates are fixed to the surface of the horizontal linear module. A square profile plate is fixed to the surface of the L-shaped plate. Printing screens are slidably connected inside the square profile plates on the left and right sides.

[0009] As a preferred embodiment of the curved screen printing device for printing platform of this utility model, the surface of the square profile plate is threaded with multiple shank bolts, and the bottom end of the shank bolts is slidably connected to the top of the printing screen plate.

[0010] As a preferred embodiment of the curved screen printing device for a printing platform according to this utility model, the curvature radius of the curved printing platform ranges from 500mm to 1000mm, and its arc center angle ranges from 30° to 90°.

[0011] As a preferred embodiment of the curved screen printing device for the printing platform of this utility model, the aperture of the curved printing platform is 0.3mm to 0.8mm, and the apertures are uniformly distributed in a matrix pattern within the working area of ​​the curved printing platform. The working area of ​​the surface of the curved printing platform is at least 5mm away from the edge of its panel.

[0012] As a preferred embodiment of the curved screen printing device for printing platforms of this utility model, the drive motor is a servo motor equipped with a brake device at the tail.

[0013] As a preferred embodiment of the curved screen printing device for the printing platform of this utility model, the curved printing platform is made of anodized aluminum alloy.

[0014] As a preferred embodiment of the curved screen printing device for printing platforms of this utility model, the base surface is provided with a controller.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention fundamentally changes the traditional demolding method by adopting a curved printing platform and combining it with the synchronous motion control of the squeegee. It effectively overcomes the stickiness of the paste by using a progressively increasing separation angle, completely eliminating the phenomenon of screen sticking, and significantly reducing the product scrap rate and screen cleaning cost. The device has a reasonable structural design and a high degree of automation. The controller realizes the precise coordination of each execution component, ensuring the consistency and repeatability of the printing process. It is particularly suitable for precision printing of high-end and fragile materials such as semiconductor ceramic film preforms, and significantly improves production efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective; Figure 3 This is a schematic diagram of the curved surface platform mechanism in this utility model; Figure 4 This is a schematic diagram of the printing mechanism in this utility model.

[0017] In the diagram: 1. Base; 2. Curved platform mechanism; 201. Mounting frame; 202. Curved printing platform; 203. Mounting table; 204. Linear guide rail; 205. Slider; 206. Bearing with seat; 207. Drive motor; 208. Adsorption hole; 209. Vacuum device; 210. Evacuation pipe; 211. Electric cylinder; 212. Clearance part; 3. Printing mechanism; 301. Lifting linear module; 302. Horizontal linear module; 303. Connecting block; 304. Squeegee assembly; 305. L-shaped plate; 306. Square outline plate; 307. Printing screen; 308. Bolt with handle; 4. Controller. Detailed Implementation

[0018] Please see Figures 1-4 A curved screen printing apparatus for a printing platform includes a base 1, a curved platform mechanism 2 and a printing mechanism 3 disposed on the top of the base 1. The curved platform mechanism 2 includes a mounting frame 201, a curved printing platform 202 is mounted on the mounting frame 201, a rotating structure is mounted on the surface of the mounting frame 201, an air extraction structure is provided on the top of the base 1, multiple suction holes 208 are opened on the surface of the curved printing platform 202, the curved printing platform 202 has a hollow interior design, two mounting platforms 203 are fixed on the top of the base 1, a linear guide rail 204 is fixed on the top of the mounting platform 203, a slider 205 is slidably connected to the surface of the linear guide rail 204, an electric cylinder 211 is fixed on the top of the base 1, one end of the electric cylinder 211 is fixedly connected to the surface of the mounting frame 201, and the top of the slider 205 is fixedly connected to the bottom of the mounting frame 201.

[0019] Driven by an electric cylinder 211, the curved printing platform 202 can reciprocate horizontally along the linear guide 204 on the machine base 1, thereby conveying or removing the substrate it carries to the printing station. The curved design of the curved printing platform 202 is the basis for achieving progressive demolding. Its internal cavity and air extraction structure work together to firmly adhere the soft and thin substrate through the negative pressure generated by the suction holes 208, preventing it from shifting during the printing process. By innovatively changing the planar platform into a curved printing platform 202, a fundamental physical structural basis is provided for solving the problem of screen sticking. At the same time, the cooperation between the linear guide 204 and the electric cylinder 211 ensures the stability and accuracy of the platform movement, guaranteeing high-quality printing.

[0020] Furthermore, the rotating structure on the surface of the mounting frame 201 includes a drive motor 207, which is fixedly connected to the surface of the mounting frame 201. Two seated bearings 206 are fixedly fixed on the top of the mounting frame 201. A connecting shaft is fixedly connected to the inner ring of the seated bearings 206. One end of the connecting shaft is fixedly connected to the surface of the curved printing platform 202. The output shaft of the drive motor 207 is fixedly connected to one end of the connecting shaft on one side.

[0021] The drive motor 207 serves as the power source, driving the curved printing platform 202 to rotate precisely around its axis under the support of two bearings 206 via a connecting shaft. This rotation can be synchronously controlled with the linear movement of the platform and the movement of the squeegee. During printing, the rotational linear velocity of the curved printing platform 202 matches the moving speed of the squeegee assembly 304, ensuring that the ink is evenly applied. At the end of printing, the continuous rotation naturally and rapidly increases the separation angle between the printing screen 307 and the substrate on the curved printing platform 202. This design is key to achieving "rolling printing" and "progressive demolding." It makes the demolding process no longer an instantaneous overall separation, but rather a peeling angle that gradually increases, effectively overcoming the adhesive force of the ink and thus greatly reducing the risk of screen sticking.

[0022] Furthermore, the top air extraction structure of the base 1 includes a vacuum device 209, the surface of which is connected to an air extraction pipe 210. One end of the air extraction pipe 210 is connected to the interior of the curved printing platform 202, and the surface of the mounting frame 201 is provided with a clearance part 212 for use with the air extraction pipe 210.

[0023] After the vacuum device 209 is started, the air inside the cavity of the curved printing platform 202 is extracted through the air extraction pipe 210 to form a stable negative pressure environment. This negative pressure acts on the entire back of the substrate through the evenly distributed adsorption holes 208, generating a uniform and strong adsorption force. The clearance part 212 on the mounting frame 201 ensures that the air extraction pipe 210 will not be pulled or interfered with when the curved printing platform 202 rotates, thus ensuring the continuity and reliability of the vacuum circuit.

[0024] Furthermore, the printing mechanism 3 includes a lifting linear module 301, which is fixed to the top of the base 1. A horizontal linear module 302 is fixed to the surface of the moving part of the lifting linear module 301. A connecting block 303 is fixed to the surface of the moving part of the horizontal linear module 302. A scraper assembly 304 is fixed to the surface of the connecting block 303. Two L-shaped plates 305 are fixed to the surface of the horizontal linear module 302. A square profile plate 306 is fixed to the surface of the L-shaped plate 305. A printing screen 307 is slidably connected inside the square profile plates 306 on the left and right sides.

[0025] The lifting linear module 301 is responsible for driving the entire horizontal linear module 302 and the squeegee assembly 304 to move up and down, so as to accurately set and adjust the plate spacing between the printing screen 307 and the highest point of the curved printing platform 202. The horizontal linear module 302 is responsible for driving the squeegee assembly 304 to move at a constant speed in the horizontal direction to complete the squeegee action. The printing screen 307 is firmly installed by the square outline plates 306 and L-shaped plates 305 on both sides to form a stable printing plane.

[0026] Furthermore, the surface of the square profile plate 306 is threaded with multiple shank bolts 308, and the bottom end of the shank bolts 308 is slidably connected to the top of the printing screen plate 307.

[0027] By tightening or loosening multiple shank bolts 308, the bottom ends press down or release pressure on the top of the printing stencil 307, thereby enabling quick clamping, fine-tuning, and disassembly of the stencil. This design allows operators to easily adjust the flatness of the stencil or replace it.

[0028] Furthermore, the curvature radius of the curved printing platform 202 ranges from 500mm to 1000mm, and its arc center angle ranges from 30° to 90°.

[0029] A large radius of curvature ensures that the platform's arc surface is relatively flat, providing the necessary separation angle without causing damage or excessive deformation of the soft, thin substrate due to excessive bending stress during adsorption. The appropriate arc center angle range ensures a sufficiently long effective printing area in a single printing stroke, while also enabling effective demolding through moderate platform rotation.

[0030] Furthermore, the aperture of the curved printing platform 202 is 0.3mm to 0.8mm, and it is uniformly distributed in a matrix pattern within the working area of ​​the curved printing platform 202. The working area of ​​the surface of the curved printing platform 202 is at least 5mm away from the edge of its panel.

[0031] Smaller pore sizes provide sufficient adsorption force while avoiding leaving obvious indentations or holes on delicate substrate surfaces. The matrix-style uniform distribution ensures that the adsorption force is evenly distributed throughout the working area, eliminating the risk of substrate deformation or displacement caused by uneven local adsorption force. The working area is left with an appropriate margin from the edge of the panel to prevent adsorption leakage caused by edge effects, ensuring that the adsorption effect in the edge area is consistent with that in the center area, thereby ensuring that the substrate is adsorbed flat.

[0032] Furthermore, the drive motor 207 is a servo motor with a brake device at the tail.

[0033] The servo motor itself has precise position and speed control capabilities, and can accurately execute the instructions of the controller 4 to achieve high-precision synchronization with the scraper movement. The brake device installed at the tail can immediately lock the motor shaft when the motor is powered off, preventing the curved printing platform 202 from rotating unexpectedly due to external force or inertia.

[0034] Furthermore, the curved printing platform 202 is made of anodized aluminum alloy.

[0035] Anodized aluminum alloys are lightweight, high-strength, and corrosion-resistant. After anodizing, a hard and wear-resistant oxide layer is formed on the surface. This oxide layer can effectively resist the wear that may be caused by the scraper or the substrate. At the same time, the surface is smooth and flat, and will not damage the fragile substrate.

[0036] Furthermore, a controller 4 is provided on the surface of the base 1. The controller 4 is electrically connected to the lifting linear module 301, the horizontal linear module 302, the electric cylinder 211, the drive motor 207, and the vacuum device 209.

[0037] The controller 4 integrates a control program that can receive user commands and synchronously coordinate the extension and retraction of the electric cylinder 211, the rotation of the drive motor 207, the start and stop of the vacuum device 209, and the actions of the lifting linear module 301 and the horizontal linear module 302. It ensures that the movement and rotation of the curved printing platform 202 and the movement of the squeegee assembly 304 work together strictly according to the preset process parameters to form a complete automated printing process.

[0038] Working principle: The thin, soft substrate to be printed (such as a ceramic blank) is placed on the curved printing platform 202. At this time, the controller 4 activates the vacuum device 209, which creates a negative pressure in the cavity inside the platform through the suction pipe 210. This negative pressure firmly and evenly adsorbs the substrate onto the curved surface of the platform through the matrix-distributed suction holes 208. Subsequently, the printing mechanism 3 begins to operate. The lifting linear module 301 descends first, driving the horizontal linear module 302 and the printing screen 307 above it to descend together until the precise plate spacing between the screen and the substrate is reached by the controller 4. Next, the core printing and synchronous motion begins: the horizontal linear module 302 drives the squeegee assembly 304 to move at a constant speed along the surface of the printing screen 307, scraping the ink through the mesh onto the substrate; simultaneously, the curved platform mechanism 2, driven by the electric cylinder 211, moves horizontally along the linear guide 204, carrying the substrate in the same direction as the squeegee movement. Furthermore, the drive motor 207 on the mounting frame 201 synchronously drives the curved printing platform 202 to rotate around its axis, with its rotational linear velocity strictly consistent with the squeegee's movement speed. This composite motion of "movement + rotation" ensures that at the moment of printing, there is almost no relative slippage between the substrate surface and the printing screen 307, thus obtaining a clear, tail-free, and precise image. When the squeegee stroke ends, the squeegee assembly 304 lifts, entering the crucial demolding stage: under the continued drive of the drive motor 207, the curved printing platform 202 rotates continuously relative to the fixed printing screen 307. This causes the contact line between the screen and the substrate to naturally separate from the highest point to both sides. The separation angle gradually increases from zero as the rotation progresses, forming a gentle and efficient "peeling" effect. This effect completely overcomes the adhesive force of the ink, allowing the substrate to smoothly detach from the screen, thus eliminating screen sticking. Finally, the platform stops rotating, the vacuum suction releases, and the printed product can be removed. This invention, through its unique curved platform design and precise motion control, effectively solves the problem of screen sticking in screen printing of soft and thin materials, and significantly improves printing quality and production efficiency.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A curved screen printing apparatus for a printing platform, characterized in that: It includes a base (1), and a curved platform mechanism (2) and a printing mechanism (3) are provided on the top of the base (1). The curved platform mechanism (2) includes a mounting frame (201), a curved printing platform (202) is provided above the mounting frame (201), a rotating structure is installed on the surface of the mounting frame (201), an air extraction structure is provided on the top of the base (1), a plurality of adsorption holes (208) are opened on the surface of the curved printing platform (202), the curved printing platform (202) is hollow inside, two mounting platforms (203) are fixed on the top of the base (1), a linear guide rail (204) is fixed on the top of the mounting platform (203), a slider (205) is slidably connected to the surface of the linear guide rail (204), an electric cylinder (211) is fixed on the top of the base (1), one end of the electric cylinder (211) is fixedly connected to the surface of the mounting frame (201), and the top of the slider (205) is fixedly connected to the bottom of the mounting frame (201).

2. The curved screen printing device for a printing platform according to claim 1, characterized in that: The rotating structure on the surface of the mounting frame (201) includes a drive motor (207), which is fixedly connected to the surface of the mounting frame (201). Two seated bearings (206) are fixedly fixed on the top of the mounting frame (201). A connecting shaft is fixedly connected to the inner ring of the seated bearing (206). One end of the connecting shaft is fixedly connected to the surface of the curved printing platform (202). The output shaft of the drive motor (207) is fixedly connected to one end of the connecting shaft on one side.

3. The curved screen printing device for a printing platform according to claim 1, characterized in that: The top air extraction structure of the base (1) includes a vacuum device (209), and the surface of the vacuum device (209) is connected to an air extraction pipe (210). One end of the air extraction pipe (210) is connected to the interior of the curved printing platform (202). The surface of the mounting frame (201) is provided with a clearance part (212) for use with the air extraction pipe (210).

4. The curved screen printing device for a printing platform according to claim 1, characterized in that: The printing mechanism (3) includes a lifting linear module (301), which is fixed to the top of the base (1). A horizontal linear module (302) is fixed to the surface of the moving part of the lifting linear module (301). A connecting block (303) is fixed to the surface of the moving part of the horizontal linear module (302). A scraper assembly (304) is fixed to the surface of the connecting block (303). Two L-shaped plates (305) are fixed to the surface of the horizontal linear module (302). A square profile plate (306) is fixed to the surface of the L-shaped plate (305). A printing screen (307) is slidably connected inside the square profile plates (306) on the left and right sides.

5. A curved screen printing apparatus for a printing platform according to claim 4, characterized in that: The square profile plate (306) has multiple shank bolts (308) threaded through its surface, and the bottom end of the shank bolts (308) is slidably connected to the top of the printing screen (307).

6. The curved screen printing apparatus for a printing platform according to claim 1, characterized in that: The curvature radius of the curved printing platform (202) ranges from 500 mm to 1000 mm, and its arc center angle ranges from 30° to 90°.

7. The curved screen printing apparatus for a printing platform according to claim 1, characterized in that: The aperture of the curved printing platform (202) is 0.3mm to 0.8mm, and is uniformly distributed in a matrix within the working area of ​​the curved printing platform (202). The working area of ​​the surface of the curved printing platform (202) is at least 5mm away from the edge of its panel.

8. A curved screen printing apparatus for a printing platform according to claim 2, characterized in that: The drive motor (207) is a servo motor with a brake device at the tail.

9. A curved screen printing apparatus for a printing platform according to claim 1, characterized in that: The curved printing platform (202) is made of anodized aluminum alloy.

10. A curved screen printing apparatus for a printing platform according to claim 1, characterized in that: The base (1) is provided with a controller (4).

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