Screen printing device for printed circuit board

Abstract

The utility model discloses a silk-screen printing device for a printed circuit board. The silk-screen printing device comprises a transmission mechanism, a silk-screen printing mechanism, a lifting mechanism, a heat transfer cylinder, a bearing positioning plate and a heating mechanism, the conveying mechanism is used for continuously conveying circuit core boards, an avoiding space is formed in the middle of the conveying mechanism, a silk-screen printing mechanism is arranged above the middle of the conveying mechanism, a heat transfer cylinder is arranged between the silk-screen printing mechanism and the conveying mechanism, and the outer side of the heat transfer cylinder is sleeved with a heating mechanism. A heating cavity is formed in the middle of the heat transfer cylinder, and a silk-screen printing cavity is correspondingly formed in the bottom of the silk-screen printing mechanism. A lifting mechanism is arranged in the avoiding space in the middle of the conveying mechanism. According to the utility model, the transmission mechanism is matched with the lifting mechanism to realize continuous screen printing of the circuit core board, and through the arrangement of the heat transfer cylinder and the heating mechanism, the forming of the screen printing is accelerated, the problem of subsequent adhesion is reduced, and the practicability is better.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit board printing, specifically relating to a screen printing device for printing circuit boards. Background Technology

[0002] The conventional process for multilayer printed circuit boards (PCBs) is: material preparation → inner layer patterning → inner layer AOI (Automated Optical Inspection) → (browning → fusion → layout → hot pressing → cold pressing → milling edges → grinding edges) lamination → drilling. In the hot and cold pressing stages, multilayer PCBs are stacked, but the resin flow from the prepreg is insufficient to fill all the gaps in the PCB. Currently, the PCB industry often uses screen printing resin to fill these gaps before lamination. Screen printing works by creating a photosensitive printing plate with images and text, utilizing the principle that ink can pass through the mesh openings in the image areas but not in the non-image areas. However, current screen printing methods rely on a single robotic arm for grasping and moving, making continuous automated screen printing impossible. Utility Model Content

[0003] The purpose of this invention is to provide a screen printing device for printed circuit boards, which aims to achieve continuous and rapid printing on circuit boards.

[0004] This utility model is mainly achieved through the following technical solutions:

[0005] A screen printing apparatus for printed circuit boards includes a conveying mechanism, a screen printing mechanism, a lifting mechanism, a heat transfer cylinder, a support positioning plate, and a heating mechanism. The conveying mechanism is used to continuously convey circuit core boards, and a clearance space is provided in the middle of the conveying mechanism. The screen printing mechanism is arranged above the middle of the conveying mechanism, and a heat transfer cylinder is arranged between the screen printing mechanism and the conveying mechanism. The heating mechanism is sleeved on the outside of the heat transfer cylinder. A heating cavity is provided in the middle of the heat transfer cylinder, and a screen printing cavity is correspondingly provided at the bottom of the screen printing mechanism. The lifting mechanism is arranged inside the clearance space in the middle of the conveying mechanism, and a support positioning plate is arranged on the top of the lifting mechanism. A stop positioning unit is arranged on one side of the support positioning plate. The lifting mechanism is used to lift the support positioning plate to lift the circuit core board through the heating cavity and into the screen printing cavity.

[0006] To better realize this utility model, the transmission mechanism further includes two parallel transmission frames and a conveying unit. There is a clearance space between the two transmission frames, and the conveying unit is installed on the transmission frame along the length direction. A circuit core board is installed between adjacent conveying units. An outwardly extending receiving support is provided in the middle of the transmission frame, and a screen printing mechanism is installed between adjacent receiving supports.

[0007] To better realize this utility model, the screen printing mechanism further includes a base, a screen printing plate, a locking mechanism, an X-axis linear drive mechanism, a cantilever, and a scraper mechanism. The base is installed between adjacent support seats. The center of the base is provided with a through screen printing cavity. Slide grooves are provided on both sides of the base. The screen printing plate is slidably pulled through adjacent slide grooves. The base is fixed to the screen printing plate by the locking mechanism. An X-axis linear drive mechanism is provided on one side of the base. The drive end of the X-axis linear drive mechanism is connected to a cantilever. A scraper assembly located above the screen printing plate is installed on the cantilever.

[0008] To better realize this utility model, the scraper mechanism further includes a lifting cylinder, a lifting support, a guide column, a scraper and an ink return plate. The scraper and the ink return plate are slidably connected to the cantilever through the guide column. One end of the guide column passes through the cantilever and is connected to the lifting support. The driving end of the lifting cylinder is connected to the lifting support.

[0009] To better realize this utility model, the locking mechanism further includes a locking screw, one end of which extends into the slide groove and abuts against the edge of the screen printing plate.

[0010] To better realize this utility model, the heating mechanism further includes a heating wire, and the heating wire is sleeved around the outer side of the heat transfer cylinder, and the bottom of the base is fixedly connected to the heat transfer cylinder.

[0011] To better realize this utility model, the lifting mechanism further includes a Z-axis linear drive mechanism and a U-shaped support, with a support and positioning plate installed on the top of the U-shaped support.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention achieves continuous screen printing on the circuit core board through the cooperation of the transmission mechanism and the lifting mechanism. Furthermore, the setting of the heat transfer cylinder and the heating mechanism accelerates the formation of the screen printing and reduces the problem of subsequent adhesion. This invention also allows for quick replacement and installation of the screen printing stencil through a pull-out method, making it convenient to operate and highly practical. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the screen printing apparatus for printed circuit boards according to this utility model.

[0015] Figure 2 This is a structural diagram of the transmission mechanism and the U-shaped support;

[0016] Figure 3 A schematic diagram of the connection structure between the seat and the cantilever;

[0017] Figure 4 This is a schematic diagram of the structure of the seat in Example 2.

[0018] Among them: 1-transmission mechanism, 12-transmission frame, 13-support, 2-heat transfer cylinder, 3-heating mechanism, 4-heating cavity, 5-screen printing mechanism, 51-base, 52-screen printing plate, 53-cantilever, 54-scraper mechanism, 55-slide groove, 56-screen printing cavity, 6-lifting mechanism, 61-U-shaped support, 7-supporting positioning plate, 8-stop positioning unit. Detailed Implementation

[0019] Example 1:

[0020] A screen printing apparatus for printed circuit boards, such as Figure 1 As shown, the device includes a transmission mechanism 1, a screen printing mechanism 5, a lifting mechanism 6, and a support and positioning plate 7. The transmission mechanism 1 has an operating space (avoidance space) in its middle. The lifting mechanism 6 is located inside the operating space, and the support and positioning plate 7 is mounted on top of the lifting mechanism 6. The lifting mechanism 6 drives the support and positioning plate 7 to rise and fall within the operating space, thereby lifting the transported circuit board into the screen printing mechanism 5. To better stop and limit the circuit board, several stopping and positioning units 8 are provided on one side of the support and positioning plate 7. Furthermore, a heat transfer cylinder 2 is provided between the screen printing mechanism 5 and the transmission mechanism 1. A heating mechanism 3 is sleeved on the outside of the heat transfer cylinder 2, and a heating cavity 4 is provided in the middle of the heat transfer cylinder 2. A screen printing cavity 56 is correspondingly provided at the bottom of the screen printing mechanism 5.

[0021] Preferably, the transmission mechanism 1 includes two parallel transmission frames 12 and a conveying unit, with a clearance space between the two transmission frames 12, and the conveying unit is installed along the length of the transmission frame 12, with a circuit core board being installed between adjacent conveying units; an outwardly extending receiving support 13 is provided in the middle of the transmission frame 12, and a screen printing mechanism 5 is installed between adjacent receiving supports 13.

[0022] Preferably, the screen printing mechanism 5 includes a base 51, a screen printing plate 52, a locking mechanism, an X-axis linear drive mechanism, a cantilever 53, and a scraper mechanism 54. The base 51 is installed between adjacent support seats 13. A through screen printing cavity 56 is provided in the middle of the base 51. Slide grooves 55 are provided on both sides of the base 51. The screen printing plate 52 is slidably pulled between adjacent slide grooves 55. The screen printing plate 52 is fixed by the locking mechanism. An X-axis linear drive mechanism is provided on one side of the base 51. The drive end of the X-axis linear drive mechanism is connected to the cantilever 53. A scraper assembly located above the screen printing plate 52 is installed on the cantilever 53.

[0023] In use, the transmission mechanism 1 continuously transports the circuit board to the clearance space. Upon detection of its position by existing sensors, the lifting mechanism 6 raises the supporting positioning plate 7 and lifts the circuit board into the screen printing cavity 56 of the screen printing mechanism 5 for screen printing. After screen printing, the lifting mechanism 6 briefly holds the circuit board inside the heating cavity 4 for rapid drying and shaping. Finally, the lifting mechanism 6 drives the supporting positioning plate 7 to hide inside the clearance space. At this point, the circuit board rests on the transmission mechanism 1 and continues to be transported to the next process. This invention achieves continuous screen printing of the circuit board through the cooperation of the transmission mechanism 1 and the lifting mechanism 6. Furthermore, the arrangement of the heat transfer cylinder 2 and the heating mechanism 3 accelerates the screen printing process and reduces subsequent adhesion problems, demonstrating good practicality.

[0024] Example 2:

[0025] A screen printing apparatus for printed circuit boards, such as Figures 1-3 As shown, the system includes a transmission mechanism 1, a screen printing mechanism 5, a lifting mechanism 6, and a support and positioning plate 7. The transmission mechanism 1 includes two parallel transmission frames 12. Each transmission frame 12 has a conveying unit along its length. The conveying unit is existing technology and can be an existing chain, conveyor belt, or other conveying structure, so it will not be described in detail. A support base 13 is provided at the top of the middle of each transmission frame 12, and the screen printing mechanism 5 is installed between adjacent support bases 13. Specifically, the lifting mechanism 6 includes a Z-axis linear drive mechanism and a U-shaped support 61. The top of the U-shaped support 61 is equipped with a support and positioning plate 7. The Z-axis linear drive mechanism is existing technology, so it will not be described in detail.

[0026] Preferably, the screen printing mechanism 5 includes a base 51, a screen printing plate 52, a locking mechanism, an X-axis linear drive mechanism, a cantilever 53, and a scraper mechanism 54. The base 51 is installed between adjacent receiving supports 13. A through screen printing cavity 56 is provided in the middle of the base 51. Slide grooves 55 are provided on both sides of the base 51, and the screen printing plate 52 is slidably pulled between adjacent slide grooves 55. The base 51 fixes the screen printing plate 52 by the locking mechanism. An X-axis linear drive mechanism is provided on one side of the base 51. The drive end of the X-axis linear drive mechanism is connected to the cantilever 53, and a scraper assembly located above the screen printing plate 52 is installed on the cantilever 53. The X-axis linear drive mechanism is existing technology; for example, it can be an existing lead screw drive mechanism, and therefore will not be described in detail. Preferably, the locking mechanism includes a locking screw, one end of which extends into the slide groove 55 and abuts against the edge of the screen printing plate 52. Figure 4As shown, the base 51 has waist-shaped grooves on both sides corresponding to the locking screws, and the screen printing stencil 52 has threaded holes on both sides of its edges. One end of the locking screw passes through the waist-shaped groove, extends into the slide groove 55, and connects to the threaded hole of the screen printing stencil 52.

[0027] Preferably, the heating mechanism 3 includes a heating wire, the heating wire is sleeved around the outer side of the heat transfer cylinder 2, and the bottom of the base 51 is fixedly connected to the heat transfer cylinder 2.

[0028] Preferably, the scraper mechanism 54 includes two sets of lifting cylinders, lifting supports, guide columns, scrapers and ink return plates. The scrapers and ink return plates are slidably connected to the cantilever 53 via guide columns. One end of the guide column passes through the cantilever 53 and is connected to the lifting supports. The driving end of the lifting cylinder is connected to the lifting supports.

[0029] In use, the screen printing stencil 52 is slidably installed into the groove, and the position of the screen printing stencil 52 and the base 51 is secured by locking screws. Then, the transmission mechanism 1 continuously transports the circuit core board to the clearance space. After the existing sensor detects the positioning, the lifting mechanism 6 is driven to raise the supporting positioning plate 7 and lift the circuit core board into the screen printing cavity 56 of the screen printing mechanism 5 for screen printing. At this time, the printing material is laid on the top of the screen printing stencil 52, and then the scraper and ink return plate are driven by two sets of lifting cylinders to press the screen printing stencil 52. The cantilever is driven to move along the X-axis direction by the X-axis linear drive mechanism to realize screen printing. After screen printing is completed, the lifting mechanism 6 briefly stops the circuit core board in the heating cavity 4 for rapid drying and shaping. Finally, the lifting mechanism 6 drives the supporting positioning plate 7 to hide inside the clearance space. At this time, the circuit core board is supported by the transmission mechanism 1 and continues to be transported to the next process. This invention achieves continuous screen printing on the circuit core board through the cooperation of the transmission mechanism 1 and the lifting mechanism 6. Furthermore, the setting of the heat transfer cylinder 2 and the heating mechanism 3 accelerates the formation of the screen printing and reduces the subsequent adhesion problem, thus having good practicality.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A screen printing device for printed circuit boards, characterized by The application relates to a circuit core plate printing device which comprises a conveying mechanism (1), a screen printing mechanism (5), a lifting mechanism (6), a heat transfer cylinder (2), a supporting positioning plate (7) and a heating mechanism (3); the conveying mechanism (1) is used for continuously conveying circuit core plates, the middle part of the conveying mechanism (1) is provided with an avoiding space, the middle part of the conveying mechanism (1) is provided with the screen printing mechanism (5) above, the heat transfer cylinder (2) is arranged between the screen printing mechanism (5) and the conveying mechanism (1), the outer side of the heat transfer cylinder (2) is provided with the heating mechanism (3); the middle part of the heat transfer cylinder (2) is provided with a heating cavity (4), the bottom of the screen printing mechanism (5) is provided with a screen printing cavity (56) in a corresponding mode; the avoiding space in the middle part of the conveying mechanism (1) is provided with the lifting mechanism (6) inside, the top of the lifting mechanism (6) is provided with the supporting positioning plate (7), one side of the supporting positioning plate (7) is provided with a stopping positioning unit (8); the lifting mechanism (6) is used for lifting the supporting positioning plate (7) so as to lift the circuit core plate to pass through the heating cavity (4) and extend into the screen printing cavity (56).

2. A screen printing device for printed circuit boards according to claim 1, characterized in that The conveying mechanism (1) comprises two parallel conveying frame bodies (12) and conveying units, the two conveying frame bodies (12) are provided with the avoiding space, the conveying frame bodies (12) are provided with the conveying units along the length direction, and circuit core plates are arranged on the conveying units; the middle part of the conveying frame body (12) is provided with an outwardly extending supporting support (13), and the screen printing mechanism (5) is arranged between the adjacent supporting supports (13).

3. A screen printing device for printed circuit boards according to claim 2, characterized in that The screen printing mechanism (5) comprises a seat body (51), a screen printing screen plate (52), a locking mechanism, an X-axis linear driving mechanism, a cantilever (53) and a scraper mechanism (54), the seat body (51) is arranged between the adjacent supporting supports (13), the middle part of the seat body (51) is provided with a through screen printing cavity (56), the two sides of the seat body (51) are provided with sliding grooves (55) respectively, the screen printing screen plate (52) is slidably arranged between the adjacent sliding grooves (55), and the screen printing screen plate (52) is fixed by the locking mechanism; one side of the seat body (51) is provided with the X-axis linear driving mechanism, the driving end of the X-axis linear driving mechanism is connected with the cantilever (53), and the cantilever (53) is provided with the scraper assembly above the screen printing screen plate (52).

4. A screen printing device for printed circuit boards according to claim 3, characterized in that The scraper mechanism (54) comprises a lifting cylinder, a lifting support, a guide column, a scraper and an ink returning plate, the scraper and the ink returning plate are slidably connected with the cantilever (53) through the guide column respectively, one end of the guide column penetrates through the cantilever (53) and is connected with the lifting support, and the driving end of the lifting cylinder is connected with the lifting support.

5. A screen printing device for printed circuit boards according to claim 3, wherein The locking mechanism comprises a locking screw, one end of the locking screw penetrates into the sliding groove (55) and abuts against the edge of the screen printing screen plate (52).

6. A screen printing device for printed circuit boards according to claim 3, characterized in that The heating mechanism (3) comprises heating wires, the outer side of the heat transfer cylinder (2) is provided with the heating wires along the circumferential side, and the bottom of the seat body (51) is fixedly connected with the heat transfer cylinder (2).

7. A screen printing device for printed circuit boards according to claim 1, characterized in that The lifting mechanism (6) comprises a Z-axis linear driving mechanism and a U-shaped support (61), and a bearing positioning plate (7) is mounted on the top of the U-shaped support (61).

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