A three-section solder paste scraper device

Abstract

This utility model discloses a three-section solder paste squeegee device, relating to the field of solder paste printing. It includes a blade, with a blade holder mounted on the upper end of the blade. The blade and blade holder are connected by a disassembly / assembly assembly, and the disassembly / assembly assembly is connected to the blade holder by an anti-drop component. A brush screen is disposed below the blade, and a PCB board is disposed below the brush screen. The blade has notches. This utility model, through the design of the squeegee's external structure, creates notches on the left and right sides of the blade to accommodate excess solder paste, preventing solder paste from the PCB edge from moving to the inner PCB, thus avoiding excessive solder paste thickness on the inner PCB. Furthermore, the disassembly / assembly assembly and the anti-drop component prevent the blade from easily detaching from the blade holder.

Description

Technical Field

[0001] This utility model relates to the field of solder paste printing, specifically to a three-section solder paste scraper device. Background Technology

[0002] With the development of technology and the demand for miniaturized LED spacing, as well as the continuous improvement of process and equipment precision by major packaging manufacturers, the application of Mini LEDs is gradually gaining popularity. The continuous improvement of process and equipment precision, due to the smaller size of Mini LEDs compared to traditional LED chips, presents new challenges to existing equipment technologies in terms of transfer speed, placement accuracy, and production yield. In the SMT manufacturing process, solder paste printing, as the first step, has a crucial impact on SMT manufacturing quality. Printing quality directly affects the performance and reliability of surface mount components, and solder paste printing technology is the guarantee of solder joint quality and the final product quality. Solder paste is mainly used to solder electronic components such as resistors and capacitors on the surface of printed circuit boards. A solder paste squeegee is a tool used to spread and smooth solder paste during the assembly of printed circuit boards; it is frequently seen in electronics manufacturing. Using a solder paste squeegee, solder paste can be evenly spread onto the pads of the circuit board. There are many factors that affect the quality of solder paste printing, such as the manufacturing process of the stencil, the type and material of the squeegee, the opening design of the stencil, the flatness of the PCB, the setting of printing parameters, and the characteristics of the solder paste itself. One of the most important factors is the use of the squeegee in the solder paste printer. In addition to the setting of printing parameters and the selection of squeegee material, the design type of the squeegee has a great impact on the printing quality and the service life of the stencil.

[0003] The existing scraper device has the following problems: due to the thickness difference between the inner and outer boards of the PCB, during the scraping process, the solder paste on the outer board of the PCB is easy to move to the inner board of the PCB, resulting in excessive solder paste on the inner board, causing subsequent quality abnormalities. In addition, the existing blade and blade holder are prone to bolt detachment after long-term use.

[0004] Therefore, it is necessary to invent a three-section solder paste scraper device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a three-section solder paste scraper device to solve the problems mentioned in the background art, such as excessively thick solder paste on the inner board of the PCB during the solder scraping process due to the thickness difference between the inner and outer boards of the PCB, and the problem that the blade and the scraper holder are prone to detachment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a three-section solder paste scraper device, including a blade, a blade holder fitted at the upper end of the blade, and the blade and the blade holder are connected by a disassembly and assembly component, and the disassembly and assembly component and the blade holder are movably connected by an anti-drop component, a brush screen is provided below the blade, and a PCB board is provided below the brush screen, and the blade is provided with a notch.

[0007] Preferably, there are two notches, which divide the blade into a first solder scraping area and two second solder scraping areas, with the first solder scraping area located between the two second solder scraping areas.

[0008] Preferably, the brush screen has a printing area, two non-printing areas and two high-temperature critical areas, and the printing area, the two non-printing areas and the two high-temperature critical areas are respectively configured to correspond one-to-one with the first solder scraping area, the two second solder scraping areas and the two notches.

[0009] Preferably, a high-temperature tape is provided on the side of the non-printed area near the high-temperature critical zone between the non-printed area and the PCB board.

[0010] Preferably, the thickness of the steel mesh is 0.03-0.1 mm, and the thickness of the high-temperature tape is 0.05-0.2 mm.

[0011] Preferably, the disassembly and assembly components are provided in two sets, and the two sets of disassembly and assembly components are arranged symmetrically about the central axis of the tool holder.

[0012] Preferably, the disassembly and assembly assembly includes a mounting groove disposed inside the tool holder, and the mounting groove is connected to a threaded groove disposed on the tool holder. An mounting screw is installed in the internal thread of the threaded groove, and the mounting screw is connected to the threaded groove by an anti-drop component.

[0013] Preferably, the blade has a mounting hole corresponding to the threaded groove, and the mounting screw passes through the threaded groove and the mounting hole and abuts against one side wall of the mounting groove.

[0014] Preferably, the anti-drop component includes an annular groove disposed inside and communicating with the threaded groove, an annular block being rotatably mounted inside the annular groove, a limiting block being provided on the inner wall of the annular block, a limiting groove being provided on the side wall of the mounting screw, and the limiting block being slidably connected to the limiting groove.

[0015] Preferably, there are two limiting blocks, which are symmetrically arranged on the inner ring wall of the annular block with the central axis of the annular block as the axis of symmetry. The outer wall of the limiting block is attached to the inner wall of the limiting groove to achieve a sliding connection. This ensures that the mounting screw can rotate normally, while the anti-detachment connection between the limiting block and the limiting groove ensures that the threaded groove with the limiting block and the mounting screw with the limiting groove are connected in a way that prevents the mounting screw from being lost and increasing the installation cost.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. This utility model allows for the inclusion of solder paste on the PCB edge by opening notches on both sides of the scraper blade, thus preventing excess solder paste from moving into the inner PCB board. 2. Use a screwdriver to twist the mounting screw, so that the mounting screw connected to the threaded groove moves away from the blade when rotated, which facilitates the subsequent installation and removal of the blade. The anti-disengagement connection between the limiting block and the limiting groove ensures that the threaded groove with the limiting block and the mounting screw with the limiting groove are connected in a way that prevents the mounting screw from being lost and increasing installation costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a three-dimensional view of the overall structure of this utility model; Figure 2 This is an exploded view of the blade and blade holder connection structure of this utility model; Figure 3 This is an exploded view of the connection structure between the tool holder (partially cut) and the blade of this utility model; Figure 4 This is an exploded view of the connection structure between the disassembly / assembly component and the anti-drop component of this utility model; Figure 5 This is a schematic diagram of the blade, brush, and PCB board of this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Blade; 101. First solder scraping area; 102. Second solder scraping area; 2. Blade holder; 3. Stencil; 4. PCB board; 5. Notch; 6. Assembly / disassembly assembly; 601. Mounting slot; 602. Threaded slot; 603. Mounting screw; 7. Anti-drop assembly; 701. Annular groove; 702. Annular block; 703. Restricting block; 704. Restricting groove; 8. High-temperature tape; 9. Mounting hole. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] This utility model provides, for example Figure 1-5 The three-section solder paste scraper device shown includes a blade 1, a blade holder 2 fitted at the upper end of the blade 1, and the blade 1 and the blade holder 2 are connected by a disassembly and assembly component 6. The disassembly and assembly component 6 and the blade holder 2 are connected by an anti-drop component 7 to prevent them from falling off. A brush 3 is provided below the blade 1, and a PCB board 4 is provided below the brush 3. A notch 5 is provided on the blade 1.

[0022] The blade 1 and the tool holder 2 are connected by the disassembly and assembly component 6, which facilitates the subsequent disassembly and assembly of the blade. The anti-drop component 7 is used to further strengthen the connection between the blade and the tool holder, and prevent the disassembly and assembly components from coming apart during long-term use.

[0023] Because there is a thickness difference between the inner board and the side board of PCB board 4, in this embodiment, the side board is 0.05mm thicker than the inner board. During the soldering process, the solder paste on the outer side board of PCB board 4 will move towards the inner board of PCB board 4 under the action of the blade, resulting in excessive solder paste in the inner board of PCB board 4, causing short circuit quality abnormalities. By setting a notch 5 on the blade 1, the solder paste on the side board of PCB board 4 can be accommodated, preventing excess solder paste from moving towards the inner board of PCB board 4.

[0024] There are two notches 5, and the two notches 5 are symmetrically arranged on the blade 1 with the central axis of the blade 1 as the axis of symmetry, dividing the blade 1 into three sections. The two notches 5 divide the blade 1 into a first tin-scraping area 101 and two second tin-scraping areas 102. The first tin-scraping area 101 is located between the two second tin-scraping areas 102. The brush 3 has a printing area, two non-printing areas and two high-temperature critical areas. The printing area, two non-printing areas and two high-temperature critical areas are respectively arranged in a one-to-one correspondence with the first tin-scraping area 101, the two second tin-scraping areas 102 and the two notches 5, extending the tin-scraping range of the blade 1 from the printing area to the non-printing area of ​​the brush 3, so that the printing area and the non-printing area of ​​the brush 3 are subjected to the same force, avoiding the deformation of the brush 3 due to uneven force on the left and right sides in the high-temperature critical area.

[0025] In one optional embodiment, the inner board of the PCB board 4 is configured to correspond to the printing area of ​​the screen 3, the side board of the PCB board 4 is configured to correspond to the non-printing area of ​​the screen 3, and the high temperature critical zone corresponds to the height difference area between the inner board and the side board of the PCB board.

[0026] In one optional embodiment, a high-temperature tape 8 is provided between the non-printed area and the PCB board 4 on the side near the high-temperature critical zone. The high-temperature tape has a thickness of 0.05-0.2 mm.

[0027] There are two sets of disassembly and assembly components 6, and the two sets of disassembly and assembly components 6 are symmetrically arranged with the central axis of the tool holder 2 as the axis of symmetry.

[0028] The assembly / disassembly component 6 includes a mounting groove 601 inside the tool holder 2, which is connected to a threaded groove 602 on the tool holder 2. A mounting screw 603 is installed inside the threaded groove 602. The mounting screw 603 and the threaded groove 602 are connected to each other by an anti-drop component 7 to prevent them from falling off. The blade is provided with a mounting hole 9 corresponding to the threaded groove 602. The mounting screw 603 passes through the threaded groove 602 and the mounting hole 9 and abuts against one side wall of the mounting groove 601.

[0029] This way, when the screwdriver is used to twist the mounting screw 603, the mounting screw 603, which is threadedly connected to the threaded groove 602, will move away from the blade 1 when it rotates, making it easier to disassemble and assemble the blade 1 later.

[0030] The anti-drop component 7 includes an annular groove 701 disposed inside and communicating with the threaded groove 602. An annular block 702 is rotatably mounted inside the annular groove 701. A limiting block 703 fixedly mounted on the inner annular wall of the annular block 702 is slidably connected to a limiting groove 704 disposed inside the mounting screw 603. Two limiting blocks 703 form a group. The two limiting blocks 703 are symmetrically disposed on the inner annular wall of the annular block 702 with the central axis of the annular block 702 as the axis of symmetry. The outer wall of the limiting block 703 is attached to the inner wall of the limiting groove 704 to achieve a sliding connection.

[0031] While ensuring that the mounting screw 603 can rotate normally, the movable connection between the limiting block 703 and the limiting groove 704 ensures that there is effective space for the mounting screw 603, which is threadedly connected to the threaded groove 602, to move during rotation. The anti-disengagement connection between the limiting block 703 and the limiting groove 704 ensures that the threaded groove 602 with the limiting block 703 and the mounting screw 603 with the limiting groove 704 are anti-disengaged, avoiding the loss of the mounting screw 603 and increasing installation costs.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A three-stage tin paste doctor blade device comprising a blade (1), characterized in that, The upper end of the blade (1) is fitted with a blade holder (2), and the blade (1) and the blade holder (2) are connected by a disassembly assembly (6), and the disassembly assembly (6) and the blade holder (2) are movably connected by an anti-drop assembly (7). A brush mesh (3) is provided below the blade (1), and a PCB board (4) is provided below the brush mesh (3). A notch (5) is provided on the blade (1).

2. The three-stage solder paste doctor blade device according to claim 1, characterized in that Two notches (5) are provided, and the two notches (5) divide the blade (1) into a first tin scraping area (101) and two second tin scraping areas (102), with the first tin scraping area (101) located between the two second tin scraping areas (102).

3. The three-stage solder paste doctor blade device of claim 2, wherein, The brush (3) is provided with a printing area, two non-printing areas and two high-temperature critical areas. The printing area, the two non-printing areas and the two high-temperature critical areas are respectively set to correspond one-to-one with the first tin scraping area (101), the two second tin scraping areas (102) and the two notches (5).

4. The three-stage solder paste doctor blade apparatus of claim 3, wherein, High-temperature tape (8) is provided between the non-printed area and the PCB board (4) on the side near the high-temperature critical zone.

5. The three-stage solder paste doctor blade apparatus of claim 4, wherein, The thickness of the brush (3) is 0.03-0.1mm, and the thickness of the high-temperature tape (8) is 0.05-0.2mm.

6. The three-stage solder paste doctor blade apparatus of claim 2, wherein, The disassembly and assembly components (6) are provided in two sets, and the two sets of disassembly and assembly components (6) are symmetrically arranged with the central axis of the tool holder (2) as the axis of symmetry.

7. The three-stage solder paste doctor blade device of claim 6, wherein, The disassembly and assembly component (6) includes an installation groove (601) disposed inside the tool holder (2), and the installation groove (601) is connected to the threaded groove (602) disposed on the tool holder (2), and an installation screw (603) is installed inside the threaded groove (602), and the installation screw (603) and the threaded groove (602) are connected by the anti-drop component (7).

8. The three-section solder paste scraper device according to claim 7, characterized in that, The blade (1) is provided with a mounting hole (9) corresponding to the threaded groove (602), and the mounting screw (603) passes through the threaded groove (602) and the mounting hole (9) and abuts against one side wall of the mounting groove (601).

9. The three-section solder paste scraper device according to claim 8, characterized in that, The anti-drop component (7) includes an annular groove (701) disposed inside the threaded groove (602) and communicating with the threaded groove (602). An annular block (702) is rotatably mounted inside the annular groove (701). A limiting block (703) is fixedly provided on the inner annular wall of the annular block (702). A limiting groove (704) is provided on the side wall of the mounting screw (603). The limiting block (703) is slidably connected to the limiting groove (704).

10. The three-section solder paste scraper device according to claim 9, characterized in that, There are two limiting blocks (703). The two limiting blocks (703) are symmetrically arranged on the inner ring wall of the annular block (702) with the central axis of the annular block (702) as the axis of symmetry. The outer wall of the limiting block (703) is attached to and slidably connected to the inner wall of the limiting groove (704).

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