Automatic glue sealing device for thick film screen printing plate

Abstract

The invention relates to an automatic glue sealing device for a thick film screen printing plate, and belongs to the technical field of thick film integrated circuit manufacturing. The device comprises a supporting plate, a screen carrying table is arranged on the supporting plate, a set of clamps which can be opened and closed and are used for pressing and limiting a screen are arranged on the peripheral side edge of the screen carrying table, a supporting frame located above the screen carrying table is arranged on the supporting plate, and a set of horizontal transverse moving mechanisms with the number consistent with that of the peripheral side edges of the screen are arranged on the supporting frame. The straight line of the moving direction of the horizontal transverse moving mechanism is parallel to the gluing edge of the corresponding side of the screen; a vertical lifting mechanism which lifts downwards is arranged at the moving end of each horizontal transverse moving mechanism, and a glue scraping head is connected to the moving end of each vertical lifting mechanism; under the action of the horizontal transverse moving mechanism and the vertical lifting mechanism, each glue scraping head scrapes glue along the edge of the screen printing plate, and the head glue scraping area and the tail glue scraping area of the adjacent glue scraping heads coincide. The horizontal transverse moving mechanism and the vertical lifting mechanism are the same in structure. According to the device, automatic glue sealing of the screen printing plate can be realized, and the glue sealing quality and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of thick-film integrated circuit manufacturing technology, and specifically to an automatic encapsulation device for thick-film stencils. Background Technology

[0002] With the continuous development of thick-film technology and the increasing batch size of circuits, the linewidth and spacing of circuits are becoming increasingly finer, with circuit board linewidths reaching 4 mils or even finer. The bonding of circuit components is also becoming miniaturized. Thick-film printing of circuits relies on screen printing, and the screen encapsulation process is a crucial step in screen printing. Manual screen encapsulation significantly impacts the quality of screen printing and has a long production cycle. With the increasing demand for these circuits, there is a need to develop automated screen encapsulation equipment. For example, a type of outsourced circuit is produced in large batches, requiring the substrate to be free of any foreign objects that could be considered defective. This necessitates more precise screen printing, ensuring no pinholes or light leakage during encapsulation. Currently, screen printing requires horizontal placement and inspection under a microscope by operators, with quality control relying on manual labor. This results in low efficiency and inconsistent quality.

[0003] Search results revealed that although there are existing coating devices for automatic printing screens, such as the intelligent coating device and method for printing screen processing disclosed in CN120094807A, the structure mentioned therein is relatively complex and the screen needs to be vertically positioned during use. Therefore, it is not suitable for the screen sealing application scenario in this application. Summary of the Invention

[0004] To address the problems of low efficiency and unreliable quality in the existing screen printing gluing process, this invention provides an automatic gluing device for thick-film screen printing.

[0005] It adopts the following technical solution: An automatic sealing device for thick film screen printing includes a support plate, on which a screen printing plate carrier is provided. A set of openable and closable clips for pressing and limiting the screen printing plate are provided at the peripheral edge of the screen printing plate carrier. The support plate is provided with a support frame located above the screen printing plate carrier. The support frame is provided with a set of horizontal transverse movement mechanisms, the number of which is the same as the number of peripheral edges of the screen printing plate. The straight line in which the horizontal transverse movement mechanism moves is parallel to the glue-coating edge of the corresponding side of the screen printing plate. Each of the horizontal traverse mechanisms has a vertical lifting mechanism that moves downwards and upwards at its moving end, and the moving end of the vertical lifting mechanism is connected to a scraper head; under the action of the horizontal traverse mechanism and the vertical lifting mechanism, each scraper head scrapes glue along the edge of the screen, and the scraping areas of adjacent scraper heads overlap. The horizontal traversing mechanism and the vertical lifting mechanism have the same structure. They both include a base, on which a pair of bearings with seats are provided. A threaded transmission rod with one end extending outward is connected to both bearings. A stepper motor is connected to the extended end of the threaded transmission rod. A guide rod is also fixedly connected to the base. The guide rod and the threaded transmission rod are parallel. A slider is screwed onto the threaded transmission rod. The slider has a guide hole that slides with the guide rod. The slider serves as the moving end of the corresponding mechanism.

[0006] Furthermore, the scraper head is a rubber plate.

[0007] Furthermore, the device also includes a glue supply mechanism, which includes a glue supply nozzle mounted on the glue scraper head. The glue supply nozzle is connected to the glue supply tank via a hose, and a drive pump is provided on the transmission path between the glue supply nozzle and the glue supply tank.

[0008] Furthermore, the bottom of the squeegee head is provided with a squeegee lip, and the squeegee lip and the contact area of ​​the screen form a combined squeegee line. The combined squeegee line includes a first squeegee line located on the inner side to prevent the adhesive from being applied to the inner side of the screen, and a second squeegee line that forms an acute angle with the forward direction of the squeegee head and guides the adhesive to be applied to the outer side of the screen and discharged outward. The dispensing position of the glue nozzle is located outside and close to the first glue scraping line.

[0009] Furthermore, the scraper lip has a fixed end integrally connected to the scraper head and an extended free end, and the thickness of the scraper lip gradually increases from the free end to the fixed end.

[0010] The advantages of this invention compared to the prior art are as follows: This invention enables automatic gluing of screen printing plates. Through a horizontal traversing mechanism and a vertical lifting mechanism, the movement position of the glue scraper head can be accurately controlled. Combined with a special glue scraper lip setting, the uniformity of the glue thickness can be improved, as well as the quality of the glue. Overall, it can improve the production efficiency of screen printing plate gluing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an automatic sealing device for thick film screen printing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the screen printing plate carrier and the card holder in an embodiment of the present invention; Figure 3 This is a schematic diagram of the horizontal lateral movement mechanism and the vertical lifting mechanism in an embodiment of the present invention; Figure 4 This is a schematic diagram of the adhesive supply mechanism in an embodiment of the present invention; Figure 5 This is a schematic diagram of the scraper head structure in an embodiment of the present invention; Figure 6This is a schematic diagram of the glue scraping head in an embodiment of the present invention.

[0012] Explanation of reference numerals in the attached drawings: 100, screen printing plate carrier; 101, slot; 102, clamp; 200, support frame; 201, support column; 202, connecting block; 300, horizontal traverse mechanism; 301, base; 302, bearing with seat; 303, threaded transmission rod; 304, coupling; 305, stepper motor; 306, guide rod; 307, fixed seat; 308, slider; 308a, guide hole; 400, vertical lifting mechanism; 500, scraper head; 501, scraper lip; 501a, first scraper line; 501b, second scraper line; 600, glue supply mechanism; 601, glue supply nozzle; 602, glue supply box; 603, drive pump; 700, support plate. Detailed Implementation

[0013] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates an automatic sealing device for thick-film screen printing according to the present invention. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0014] like Figure 1 , Figure 2 As shown, an automatic sealing device for thick-film stencils includes a support plate 700, on which a stencil carrier 100 is fixed. The stencil carrier 100 is a rectangular frame structure made of metal, and its surrounding frame surfaces support and bear a stainless steel stencil. The stainless steel stencil has a rectangular outline, the size of which matches the outline size of the stencil carrier 100. A rectangular slot 101 is provided on each frame side of the stencil carrier 100, with the slot 101 opening upwards and outwards. A clamp 102 connected to the support plate 700 is placed at each slot 101. The moving end of the clamp 102 can open and close towards the rectangular slot 101, thereby compressing the side edges of the stainless steel stencil. Thus, the combined action of the four clamps 102 achieves the limiting and fixing of the stainless steel stencil. Here, the clamps 102 are existing technologies, such as button-controlled electric cylinders or other reciprocating motion mechanisms using common pneumatic or hydraulic energy forms.

[0015] The support plate 700 is equipped with a support frame 200 located above the screen printing table 100. The support frame 200 is a three-dimensional frame structure, and in the illustration, it is composed of support columns 201 and connecting blocks 202, which are connected by welding, pinning, screwing, etc. The support columns 201 are fixed to the support plate 700. Of course, other frame structures that achieve support and load-bearing functions can also be used. Four horizontal transverse movement mechanisms 300 are provided on the support frame 200. The straight line of the movement direction of each horizontal transverse movement mechanism 300 is parallel to the four corresponding glue-coating edges of the screen. The horizontal moving end of the horizontal transverse movement mechanism 300 is equipped with a vertical lifting mechanism 400 that moves downward. The moving end of the vertical lifting mechanism 400 is connected to a glue scraper head 500. Preferably, the glue scraper head 500 is a rubber plate. The elasticity of the rubber plate reduces the jamming phenomenon of the glue scraper head during movement, and also allows for more even application of glue. Under the action of the horizontal moving mechanism 300 and the vertical lifting mechanism 400, each scraper head 500 scrapes glue along the edge area of ​​the screen, and the first and last scraping areas of adjacent scraper heads 500 overlap.

[0016] Specifically, the horizontal lateral movement mechanism 300 and the vertical lifting mechanism 400 have the same structure. This embodiment uses the horizontal lateral movement mechanism 300 as an example for illustration. Figure 3 As shown, it includes a base 301, on which a pair of seated bearings 302 are mounted. The two seated bearings 302 are coaxially arranged and are connected to a threaded transmission rod 303 with one end extending outward. The extended end of the threaded transmission rod 303 is connected to a stepper motor 305 via a coupling 304. A guide rod 306 is also fixedly connected to the base 301. The guide rod 306 is fixedly connected to the base 301 via a guide rod fixing seat 307. Here, the guide rod 306 and the threaded transmission rod 303 are arranged parallel to each other. A slider 308 is screwed onto the transmission rod 303. The slider 308 is provided with a guide hole 308a that slides with the guide rod 306. Under the anti-rotation limit of the guide rod 306, the stepper motor 305 drives the threaded transmission rod 303 to rotate, so that the slider 308 moves linearly along the axial direction of the threaded transmission rod 303. The slider 308 is the moving end, and its shape and size can be set according to the displacement limit position to ensure that the first and last scraping areas of the adjacent scraping heads 500 can overlap without the mechanism itself interfering with the movement.

[0017] In some embodiments, the device further includes an adhesive supply mechanism 600, combined with Figure 3 , 4As shown, it includes a glue supply nozzle 601 mounted on a glue scraper head 500. The glue scraper head 500 has a vertical through-hole corresponding to the glue supply nozzle 601. The nozzle of the glue supply nozzle 601 is positioned downwards and located on the glue scraping movement path. It is connected to a glue supply tank 602 via a flexible hose. A drive pump 603 is provided on the transmission path between the glue supply nozzle 601 and the glue supply tank 602. Of course, to improve glue supply accuracy and reduce costs, this structure can share a single glue supply tank 602, with a peristaltic pump on each branch to provide precise glue supply. In addition, considering glue scraping efficiency and reducing reciprocating glue scraping motions, the glue supply point can be set at the starting position of each glue scraper head 500.

[0018] Furthermore, such as Figure 5 , Figure 6 As shown, the bottom of the scraper head 500 is provided with a scraper lip 501. The scraper lip 501 has a fixed end integrally connected with the scraper head 500 and an extended free end. The thickness of the scraper lip 501 gradually increases from the free end to the fixed end, and under the action of its own rubber elasticity, the consistency of the scraping thickness is further improved.

[0019] The line shape presented by the squeegee lip 501 is preferably a zigzag line. Specifically, in a static state, it forms a combined squeegee line with the contact area of ​​the screen. The combined squeegee line includes a first squeegee line 501a located on the inner side to prevent the adhesive from being applied to the inner side of the screen, and a second squeegee line 501b forming an acute angle α with the advancing direction of the squeegee head 500 to guide the adhesive to be applied to the outer side of the screen and to be patted outward. The glue dispensing position of the glue nozzle 601 is located outside and close to the first squeegee line 501a. In this way, during the scraping process of the scraping head 500, the first scraping line 501a can act as a limiting structure for the movement of the adhesive, preventing the adhesive from moving inward and breaking through the scraping area, thus ensuring that the actual scraping area meets the set requirements. Due to the presence of the included angle α, the second scraping line 501b guides the excess adhesive outward along the second scraping line 501b while scraping the adhesive evenly, thereby ensuring the consistency of the scraping thickness. Of course, the scraping thickness here is also related to the vertical height position of the scraping head 500, which is further controlled by the precise number of rotations of the stepper motor in the vertical lifting mechanism 400 to control the vertical displacement position of the slider 308.

[0020] The working process of this device is as follows: The stainless steel screen is positioned and fixed on the screen carrier table 100 by the clamp 102. The horizontal moving mechanism 300, the vertical lifting mechanism 400, and the glue supply mechanism 600 start working. The working process of each glue-applied edge of the stainless steel screen is defined as process segment 1 to process segment 4, and the operation steps of process segment 1 to process segment 4 are the same. Each process segment includes: 1. The horizontal movement mechanism 300 moves to adjust the scraper head 500 back to the starting point; 2. The vertical lifting mechanism 400 operates to lower the glue scraper head 500 to a suitable position and stop. Then the glue supply mechanism 600 works to supply the appropriate amount of glue to this process section. After that, the glue scraper head 500 lowers to the glue scraping state. 3. The horizontal moving mechanism 300 runs again to move the scraper head 500 parallel to its end position and then stops. Then the vertical lifting mechanism 400 runs to raise the scraper head 500 to the appropriate position. 4. The horizontal traverse mechanism 300 runs again to move the scraper head 500 parallel to the middle of its stroke. The specific position is determined by not interfering with the overlapping scraping areas of the first and last scraping heads of the adjacent scraper heads 500.

[0021] Run steps 1 through 4 sequentially, ensuring that all adjacent beginning and end scraping areas overlap, then the device operation ends. During the above process, the glue supply mechanism 600 can supply glue continuously or intermittently while the scraping head 500 is running horizontally. The specific glue supply method is not limited, but it is advisable to reduce glue waste while meeting the requirement of uniform scraping thickness.

[0022] Overall, this device can achieve automatic screen sealing. Through the horizontal traversing mechanism and the vertical lifting mechanism, the movement position of the glue scraper head can be accurately controlled. Combined with the special glue scraper lip setting, it can improve the uniformity of the sealing thickness and the sealing quality, thus improving the overall efficiency of screen sealing.

[0023] The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, obvious variations or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. An automatic sealing device for thick film screen printing, comprising a support plate (700), a screen printing plate carrier (100) provided on the support plate (700), and a set of openable and closable clips (102) for pressing and limiting the screen printing plate at the peripheral edge of the screen printing plate carrier (100), characterized in that: The support plate (700) is provided with a support frame (200) located above the screen printing table (100). The support frame (200) is provided with a set of horizontal transverse mechanisms (300) with the same number as the number of sides of the screen. The straight line in which the horizontal transverse mechanism (300) moves is parallel to the glue-coated edge of the corresponding side of the screen. Each of the horizontal transverse mechanism (300) has a vertical lifting mechanism (400) that moves downwards and upwards at its moving end. The moving end of the vertical lifting mechanism (400) is connected to a scraper head (500). Under the action of the horizontal transverse mechanism (300) and the vertical lifting mechanism (400), each scraper head (500) scrapes glue along the edge of the screen, and the scraping areas of adjacent scraper heads (500) overlap. The horizontal traversing mechanism (300) and the vertical lifting mechanism (400) have the same structure. They both include a base (301). A pair of seated bearings (302) are provided on the base (301). A threaded transmission rod (303) with one end extending outward is connected to both seated bearings (302). A stepper motor (305) is connected to the extended end of the threaded transmission rod (303). A guide rod (306) is also fixedly connected to the base (301). The guide rod (306) and the threaded transmission rod (303) are parallel. A slider (308) is screwed onto the threaded transmission rod (303). The slider (308) is provided with a guide hole (308a) that slides with the guide rod (306). The slider (308) serves as the moving end of the corresponding mechanism.

2. The automatic sealing device for thick film screen printing according to claim 1, characterized in that: The scraper head (500) is a rubber sheet.

3. The automatic sealing device for thick film screen printing according to claim 2, characterized in that: The device also includes a glue supply mechanism (600), which includes a glue supply nozzle (601) on a glue scraper head (500). The glue supply nozzle (601) is connected to a glue supply box (602) via a hose. A drive pump (603) is provided on the transmission path between the glue supply nozzle (601) and the glue supply box (602).

4. The automatic sealing device for thick film screen printing according to claim 3, characterized in that: The bottom of the squeegee head (500) is provided with a squeegee lip (501). The squeegee lip (501) and the contact area of ​​the screen form a combined squeegee line. The combined squeegee line includes a first squeegee line (501a) located on the inner side to prevent the adhesive from being applied to the inner side of the screen, and a second squeegee line (501b) that forms an acute angle with the forward direction of the squeegee head (500) and guides the adhesive to be applied to the outer side of the screen and discharged outward. The dispensing position of the dispensing nozzle (601) is located outside and close to the first scraper line (501a).

5. The automatic sealing device for thick film screen printing according to claim 4, characterized in that: The scraper lip (501) has a fixed end integrally connected to the scraper head (500) and an extended free end, and the thickness of the scraper lip (501) gradually increases from the free end to the fixed end.

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