Scraper, glue scraping device and printing equipment

Abstract

The utility model relates to the field of circuit board printing equipment, in particular to a scraper, a glue scraping device and printing equipment. The scraper comprises a rectangular glue scraping part, the glue scraping part comprises a first glue scraping piece and a second glue scraping piece, one side of the second glue scraping piece is fixedly connected with one side of the first glue scraping piece, and the included angle between the second glue scraping piece and the first glue scraping piece is 60-90 degrees. The side, protruding out of the included angle, of the glue scraping part is used for making contact with the bottom of the inner wall of the screen plate, the length L1 of the glue scraping part in the width direction is smaller than the width L2 of a through groove of the screen plate, and the difference between L2 and L1 ranges from 1 mm to 2 mm; the glue scraping device comprises the scrapers and a driving mechanism, the scrapers are connected to the driving mechanism, and the number of the scrapers is at least two; the printing equipment is provided with the glue scraping device. Through the arrangement, the probability of wiredrawing of the weldable object on the surface of the welded object is reduced, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of circuit board printing equipment, and particularly relates to a squeegee, a glue scraping device and a printing equipment. Background Technique

[0002] When printing a circuit board, solder paste and other solderable substances are commonly used to print a lead frame, etc. During this printing process, a stencil is required. The stencil is closely attached to the object to be soldered, and the solder paste and other solderable substances are evenly printed onto the specified position on the object to be soldered through a squeegee.

[0003] In the prior art, during the printing operation, it is necessary to add solderable substances into the stencil according to requirements. Some of the solderable substances adhere to the inner wall of the through holes in the stencil. When using a squeegee to print solder paste and other solderable substances, the side of the squeegee will scrape off the solderable substances adhering to the inner wall of the through holes in the stencil, causing the solderable substances to adhere to the surface of the squeegee. When the squeegee moves to the end of the stencil, the excess solderable substances are squeezed out along the gap between the squeegee and the inner wall of the through hole and adhere to the other side of the squeegee. As the squeegee continues to work, more and more solderable substances adhere to the other side of the squeegee, and the solderable substances will flow onto the surface of the object to be soldered along the other side of the squeegee. When the squeegee moves, there will be a phenomenon of solderable substance drawing on the object to be soldered. During the subsequent soldering process, the drawn solderable substances will form solder balls after sintering, reducing the product quality. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art, that is, when using a squeegee to print solder paste and other solderable substances, the side of the squeegee will scrape off the solderable substances adhering to the inner wall of the through holes in the stencil, causing the solderable substances to adhere to the surface of the squeegee. When the squeegee moves to the end of the stencil, the excess solderable substances are squeezed out along the gap between the squeegee and the inner wall of the through hole and adhere to the other side of the squeegee. As the squeegee continues to work, more and more solderable substances adhere to the other side of the squeegee, and the solderable substances will flow onto the surface of the object to be soldered along the other side of the squeegee. When the squeegee moves, there will be a phenomenon of solderable substance drawing on the object to be soldered. During the subsequent soldering process, the drawn solderable substances will form solder balls after sintering, reducing the product quality, and to provide a squeegee.

[0005] In a first aspect, the utility model provides a squeegee, which includes a glue scraping part. The glue scraping part is rectangular. The glue scraping part includes a first scraping film and a second scraping film. One side of the second scraping film is fixedly connected to one side of the first scraping film. The included angle between the second scraping film and the first scraping film is 60° - 90°. The protruding side of the glue scraping part at the included angle is used to contact the bottom of the inner wall of the stencil. The length L of the glue scraping part in the width direction 1 is less than the width L of the through hole of the stencil 2 , L 2 and L 1The difference is 1mm-2mm.

[0006] By setting the angle between the second scraper blade and the first scraper blade to be 60°-90°, a groove is formed at the connection between the second scraper blade and the first scraper blade, and a convex side of the connection between the second scraper blade and the first scraper blade forms an edge. The length L of the scraper portion along the width direction 1 Smaller than the width L of the through slot of the mesh plate 2 , that is, the length L of the scraping part along the axial direction of the edge 1 Smaller than the width L of the through slot of the mesh plate 2 , L 2 With L 1 The difference is 1mm-2mm, so that there are gaps between the two side edges at both ends of the edge and the two side walls of the through groove respectively. When the scraper is working, the straight line where the edge of the scraping part is located is perpendicular to the side wall of the screen plate through groove, and the edge is pressed against the bottom of the inner wall of the screen. The bottom of the screen is provided with a through hole, and the scraper is moved on the bottom of the inner wall of the screen in a direction perpendicular to the edge, that is, the edge is used to scrape the weldable material at the bottom of the inner wall of the screen, so that the weldable material flows to the welded object through the through hole at the bottom of the screen. When printing, it is necessary to add weldable material to the screen according to demand. Part of the weldable material sticks to the inner wall of the screen plate through groove. When the scraper moves, the side of the scraping part will The solderable material adhering to the wall is scraped off, so that the solderable material adheres to the surface of the scraper part. When the scraper moves to the end of the mesh plate, the excess solderable material is squeezed and overflowed along the gap between the scraper part and the inner wall of the through groove, and adheres to the other side of the scraper part. As the scraper part continues to work, more and more solderable material adheres to the scraper part. When the solderable material flows along the first scraper blade or the second scraper blade, it will flow through the groove and gather in the groove. The groove collects the solderable material, thereby reducing the probability of the solderable material flowing to the surface of the object to be welded to produce wiredrawing, thereby reducing the probability of tin beads appearing in the wiredrawing part of the solderable material after sintering, thereby improving the quality of the product.

[0007] The second scraper blade and the first scraper blade can be connected by welding, or can be integrally formed.

[0008] The angle between the second scraper blade and the first scraper blade can be 60°, 70° or 80°, etc., preferably 90°.

[0009] L 2 With L 1 The difference is 1mm-2mm, which can be 1.6mm or 1.7mm, etc., and is preferably 1.8mm.

[0010] The first scraper blade and the second scraper blade are both rectangular, the length of the short side of the first scraper blade is equal to the length of the short side of the second scraper blade, and the short side of the first scraper blade is connected to the short side of the second scraper blade.

[0011] By making the length of the short side of the first squeegee equal to the length of the short side of the second squeegee, that is, the widths of the covered areas of the two squeegees during scraping are the same. With this setting, it helps to improve the consistency and uniformity of the coating process.

[0012] The first squeegee and the second squeegee can also be set as squares or the like.

[0013] The length of the second squeegee is 4 mm - 10 mm. The length of the second squeegee can be set to 6 mm, 7 mm, etc., and preferably 5 mm.

[0014] By setting the length of the second squeegee, the ability to collect solderable substances can be improved without affecting the operation of the squeegee.

[0015] The squeegee includes a connecting portion, and the scraping portion can be connected to the scraping device through the connecting portion.

[0016] By enabling the scraping portion to be connected to the scraping device through the connecting portion, the flexibility of using the squeegee is improved.

[0017] The scraping portion and the connecting portion can be integrally formed, or can be connected by a fixed connection or a detachable connection.

[0018] The connecting portion is a connecting piece. The connecting portion is connected to one end of the first squeegee away from the second squeegee, and the length of the side of the connecting portion connected to the first squeegee is equal to the length of the short side of the first squeegee.

[0019] By making the length of the side of the connecting portion connected to the first squeegee equal to the length of the short side of the first squeegee, it helps to improve the rigidity of the squeegee, reduce the probability of stress concentration, and reduce the probability of bending or deformation of the squeegee during the process.

[0020] The included angle between the connecting portion and the first squeegee is 140° - 150°. The included angle between the connecting portion and the first squeegee can be set to 143°, 144°, 145°, etc., and preferably 147°.

[0021] By setting the included angle between the connecting portion and the first squeegee, when the squeegee is working, the connecting portion and the first squeegee are set at a certain included angle, which can improve the degree of fitting between the scraping portion and the object to be welded, and increase the probability that the thickness of the printed solderable substance meets the requirements.

[0022] The squeegee includes a mounting hole, and the connecting portion can be connected to the scraping device through the mounting hole.

[0023] By providing mounting holes, the blade is connected to the glue scraping device through the mounting holes, and the specifications of the blade can be adjusted according to requirements, improving the flexibility of the blade use.

[0024] In a second aspect, the present utility model provides a glue scraping device, including a blade and a driving mechanism, the blade is connected to the driving mechanism, and the number of the blades is at least 2.

[0025] Through this setting, the ability of the glue scraping device to collect the overflowed or redundant solderable substances during the printing process can be improved, reducing the probability that the solderable substances flow onto the surface of the object to be welded, and when the blade moves, the phenomenon of solderable substance drawing on the object to be welded is reduced, improving the quality of the product.

[0026] The number of blades can also be set to 3 or 4, etc.

[0027] In a third aspect, the present utility model provides a printing device provided with the glue scraping device, the printing device includes a stencil, and a printing through groove is provided on one side of the stencil. Through this setting, the quality of the products produced by the printing device can be improved.

[0028] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0029] 1. The present utility model provides a blade, including a glue scraping part, the glue scraping part is rectangular, the glue scraping part includes a first scraping sheet and a second scraping sheet, one side of the second scraping sheet is fixedly connected to one side of the first scraping sheet, the included angle between the second scraping sheet and the first scraping sheet is 60° - 90°, the protruding side of the glue scraping part at the included angle is used to contact the bottom of the inner wall of the stencil, and the length L of the glue scraping part in the width direction 1 is less than the width L of the through groove of the stencil 2 , and the difference between L 2 and L 1 is 1 mm - 2 mm. By setting the included angle between the second scraping sheet and the first scraping sheet to be 60° - 90°, a groove is formed at the connection between the second scraping sheet and the first scraping sheet. When the blade moves to the end of the stencil, the redundant solderable substances are extruded and overflow along the gap between the glue scraping part and the inner wall of the through groove, adhering to the other side of the glue scraping part. As the glue scraping part continues to work, more and more solderable substances adhere to the glue scraping part. When the solderable substances flow along the first scraping sheet, a part of the solderable substances will flow through the groove and accumulate in the groove. The groove plays a role in collecting the solderable substances, thereby reducing the probability that the solderable substances flow onto the surface of the object to be welded and generating a drawing phenomenon, and further reducing the probability that the solderable substances in the drawn part will form tin beads after sintering, thus improving the quality of the product;

[0030] 2. The present utility model provides a glue scraping device, which includes a scraper and a driving mechanism. The scraper is connected to the driving mechanism, and the number of the scrapers is at least two. Through this setting, the collecting ability of the glue scraping device for the overflowing or redundant solderable substances during the printing process can be improved, and the solderable substances flowing onto the surface of the object to be welded can be reduced. When the scraper moves, the phenomenon of solderable substance wire drawing on the object to be welded is reduced, thus improving the quality of the product.

[0031] 3. The present utility model provides a printing device provided with the glue scraping device. Through this setting, the quality of the products produced by the printing device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic diagram of the scraper of Embodiment 1 provided by the present utility model.

[0033] Figure 2 It is a right view schematic diagram of the scraper of Embodiment 1 provided by the present utility model.

[0034] Figure 3 It is a three-dimensional schematic diagram of the glue scraping device of Embodiment 3 provided by the present utility model.

[0035] Reference numerals in the drawings:

[0036] 1 - Glue scraping part, 11 - First scraping sheet, 12 - Second scraping sheet, 2 - Connection part, 3 - Mounting hole, 4 - Screen plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0038] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms of the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / equipment of the present utility model is usually used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0039] In addition, when terms such as "horizontal", "vertical", "hanging", and "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel. Instead, it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0040] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the descriptions of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0041] In addition, in the description of the embodiments of the present utility model, "several", "multiple", and "a plurality of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be more than 9.

[0042] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / limited, when terms such as "set", "installed", "connected", "coupled", "provided with", "laid", and "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0043] Embodiment 1

[0044] As Figure 1-2 shown, this embodiment provides a squeegee, which includes a glue scraping part 1. The glue scraping part 1 is rectangular. The glue scraping part 1 includes a first scraping film 11 and a second scraping film 12. One side of the second scraping film 12 is fixedly connected to one side of the first scraping film 11. The included angle β between the second scraping film 12 and the first scraping film 11 is 90°. The protruding side of the glue scraping part 1 at the included angle is used to contact the bottom of the inner wall of the screen plate. The length L of the glue scraping part 1 in the width direction 1 is less than the width L of the through slot of the screen plate 4 2 , L2 With L 1 The difference is 1.8mm.

[0045] By setting the angle β between the second scraper blade 12 and the first scraper blade 11 to 90°, a groove is formed at the connection between the second scraper blade 12 and the first scraper blade 11, and a convex side of the connection between the second scraper blade 12 and the first scraper blade 11 forms an edge. The length L of the scraper portion 1 along the width direction 1 Smaller than the width L of the through slot of the mesh plate 4 2 , i.e. the length L of the scraping part 1 along the axial direction of the edge 1 Smaller than the width L of the through slot of the mesh plate 4 2 , so that there are gaps between the two side edges at both ends of the edge and the two side walls of the through groove respectively. When the scraper is working, the straight line where the edge of the scraper part 1 is located is perpendicular to the side wall of the through groove of the screen plate 4, and the edge is pressed against the bottom of the inner wall of the screen plate 4. The bottom of the screen plate 4 is provided with a through hole, and the scraper is moved on the bottom of the inner wall of the screen plate 4 in a direction perpendicular to the edge, that is, the edge is used to scrape the weldable material on the bottom of the inner wall of the screen plate 4, so that the weldable material flows to the welded object through the through hole at the bottom of the screen plate 4. When printing, it is necessary to add weldable material to the screen plate 4 according to demand, and part of the weldable material sticks to the inner wall of the through groove of the screen plate 4. When the scraper moves, the side of the scraper part 1 will stick to the inner wall of the through groove of the screen plate 4 The solderable material is scraped off and made to stick to the surface of the scraper portion 1. When the scraper moves to the end of the stencil 4, the excess solderable material is squeezed and overflowed along the gap between the scraper portion 1 and the inner wall of the through groove, and adheres to the other side of the scraper portion 1. As the scraper portion 1 continues to work, more and more solderable material sticks to the scraper portion 1. When the solderable material flows along the first scraper blade 11 or the second scraper blade 12, it will flow through the groove and gather in the groove. The groove collects the solderable material, thereby reducing the probability of the solderable material flowing to the surface of the object to be welded to produce wire drawing, thereby reducing the probability of tin beads appearing in the wire drawing part of the solderable material after sintering, thereby improving the quality of the product.

[0046] The second scraper blade 12 and the first scraper blade 11 are integrally formed, and the solderable material is solder paste.

[0047] The first scraper blade 11 and the second scraper blade 12 are both rectangular, the length of the short side of the first scraper blade 11 is equal to the length of the short side of the second scraper blade 12, and the short side of the first scraper blade 11 is connected to the short side of the second scraper blade 12.

[0048] By making the length of the short side of the first scraper blade 11 equal to the length of the short side of the second scraper blade 12, that is, the width of the coverage area of ​​the two scrapers when scraping glue is consistent, this arrangement helps to improve the consistency and uniformity of the coating process.

[0049] The length of the second scraping film 12 is 5 mm. By setting the length of the second scraping film 12, the ability to collect solderable substances can be improved without affecting the operation of the scraper.

[0050] The scraper includes a connecting portion 2, and the scraping portion 1 can be connected to the scraping device through the connecting portion 2.

[0051] By enabling the scraping portion 1 to be connected to the scraping device through the connecting portion 2, the flexibility of using the scraper is improved.

[0052] The scraping portion 1 and the connecting portion 2 are integrally formed.

[0053] The connecting portion 2 is a connecting piece. The connecting portion 2 is connected to one end of the first scraping film 11 away from the second scraping film 12, and the length of the side of the connecting portion 2 connected to the first scraping film 11 is equal to the length of the short side of the first scraping film 11.

[0054] By making the length of the side of the connecting portion 2 connected to the first scraping film 11 equal to the length of the short side of the first scraping film 11, it helps to improve the rigidity of the scraper, reduce the probability of stress concentration, and reduce the probability of the scraper bending or deforming during the process.

[0055] The included angle α between the connecting portion 2 and the first scraping film 11 is 147°.

[0056] By setting the included angle between the connecting portion 2 and the first scraping film 11, when the scraper is working, the connecting portion 2 and the first scraping film 11 are arranged at a certain included angle, which can improve the degree of fitting between the scraping portion 1 and the object to be welded, and increase the probability that the thickness of the printed solderable substance meets the requirements.

[0057] The scraper includes a mounting hole 3, and the connecting portion 2 can be connected to the scraping device through screws and the mounting hole 3.

[0058] By setting the mounting hole 3, the scraper is connected to the scraping device through the mounting hole 3, and the specifications of the scraper can be adjusted according to needs, improving the flexibility of using the scraper.

[0059] Embodiment 2

[0060] This embodiment provides a scraping device, including a scraper and a driving mechanism. The scraper is connected to the driving mechanism, and the number of scrapers is 2.

[0061] Through this setting, the ability of the scraping device to collect overflowed or redundant solderable substances during printing can be improved, reducing the phenomenon that the solderable substance flows onto the surface of the object to be welded and the appearance of solderable substance drawing on the object to be welded when the scraper moves, thereby improving the quality of the product.

[0062] Embodiment 3

[0063] As Figure 3 shown, this embodiment provides a printing device provided with the described glue scraping device, wherein the driving mechanism is not shown.

[0064] The glue scraping device includes a screen plate 4. One side of the screen plate 4 is provided with a printing through groove, and the other side is provided with a plurality of printing holes. The outer wall of the side of the screen plate 4 where the printing holes are provided is used to contact the object to be welded.

[0065] During use, the weldable object is placed in the printing through groove. The first scraping film 11 and the second scraping film 12 contact the weldable object, and the weldable object is extruded through the printing holes onto the object to be welded. The driving mechanism drives the scraper to move along the length direction of the printing through groove, and thus printing can be completed. Through this setting, the quality of the products produced by the printing device can be improved.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A scraper, characterized in that: The invention comprises a scraper portion (1), the scraper portion (1) is rectangular, the scraper portion (1) comprises a first scraper blade (11) and a second scraper blade (12), one side of the second scraper blade (12) is fixedly connected to one side of the first scraper blade (11), the angle between the second scraper blade (12) and the first scraper blade (11) is 60°-90°, the side of the scraper portion (1) protruding at the angle is used to contact the bottom of the inner wall of the mesh plate, the length L1 of the scraper portion (1) along the width direction is less than the width L2 of the through groove of the mesh plate, and the difference between L2 and L1 is 1 mm-2 mm.

2. A scraper according to claim 1, characterized in that: The first scraper blade (11) and the second scraper blade (12) are both rectangular, the length of the short side of the first scraper blade (11) is equal to the length of the short side of the second scraper blade (12), and the short side of the first scraper blade (11) is connected to the short side of the second scraper blade (12).

3. A scraper according to claim 2, characterized in that: The length of the second scraper blade (12) is 4 mm-10 mm.

4. A scraper according to claim 2 or 3, characterized in that: It comprises a connecting portion (2), and the scraping portion (1) can be connected to a scraping device via the connecting portion (2).

5. A scraper according to claim 4, characterized in that: The connecting portion (2) is a connecting sheet, and the connecting portion (2) is connected to an end of the first scraper sheet (11) away from the second scraper sheet (12), and the length of one side of the connecting portion (2) connected to the first scraper sheet (11) is equal to the length of the short side of the first scraper sheet (11).

6. A scraper according to claim 5, characterized in that: The angle between the connecting portion (2) and the first scraper blade (11) is 140°-150°.

7. A scraper according to claim 4, characterized in that: The connecting portion (2) is provided with a mounting hole (3), and the connecting portion (2) can be connected to a scraping device through the mounting hole (3).

8. A scraping device, characterized in that: It comprises the scraper and driving mechanism as described in any one of claims 1 to 7, wherein the scraper is connected to the driving mechanism, and the number of the scrapers is at least 2.

9. A printing device, characterized in that: A scraper device as claimed in claim 8 is provided.

10. A printing device according to claim 9, characterized in that: It comprises a screen plate (4), one side of which is provided with a printing slot.

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