A fixing jig for reflow soldering of a circuit board

Abstract

The application relates to a fixing jig for reflow soldering of a circuit board, and relates to the field of PCB reflow soldering technology, which comprises a base and a mounting seat, the base and the mounting seat are detachably connected, a space for flowing of a heat medium gas is formed between the mounting seat and the base, the mounting seat is fixedly connected with a plurality of mounting areas for mounting the circuit board, and a positioning structure for limiting the position of the circuit board is arranged in each of the mounting areas; a cover plate is hingedly connected to the mounting seat, and a plurality of avoiding holes for avoiding electronic components on the circuit board are formed in the cover plate. The application improves the efficiency of a reflow soldering furnace.

Description

Technical Field

[0001] This application relates to the field of PCB reflow soldering technology, and in particular to a fixture for reflow soldering circuit boards. Background Technology

[0002] As electronic products continue to evolve towards miniaturization, lightweighting, and high density, PCB assembly structures featuring double-sided or mixed mounting of surface-mount components (SMC) and surface-mount devices (SMD) have emerged. Double-sided or mixed-mount PCB assemblies typically involve reflow soldering the top (component side) and then wave soldering the bottom (lead side). With the increasing popularity of reflow soldering, it has replaced the previous reflow-then-wave soldering process, becoming a crucial technology in mixed-assembly PCB manufacturing.

[0003] In existing technologies, to ensure the stability of circuit boards, appropriate fixtures are needed to clamp and position them. Common reflow soldering fixtures mainly consist of a base with multiple limiting protrusions fixedly connected to it. Between these protrusions are formed mounting grooves for mounting the circuit board. The bottom of the mounting groove has through-holes to avoid electronic components on the circuit board. Positioning components are rotatably mounted around the circuit board. After the circuit board is installed, the operator rotates the positioning components around the circuit board to press them against the edge of the circuit board, thus securing it. By placing the fixture with the mounted circuit board on the reflow soldering conveyor belt and selecting the desired temperature profile, the fixture can be driven sequentially through the preheating zone, heating zone, and cooling zone within the reflow oven.

[0004] However, common circuit board reflow soldering fixtures can usually only mount a single circuit board, resulting in low soldering efficiency and room for improvement. Utility Model Content

[0005] In order to improve the efficiency of reflow ovens, this application provides a fixture for circuit board reflow soldering.

[0006] The technical solution of the circuit board reflow soldering fixture provided in this application is as follows:

[0007] A fixture for reflow soldering circuit boards includes a base and a mounting base, which are detachably connected. A space for the flow of heating medium gas is formed between the mounting base and the base. The mounting base is fixedly connected to a plurality of mounting areas for mounting circuit boards. Each mounting area is provided with a positioning structure for limiting the position of the circuit board.

[0008] A cover plate is hinged to the mounting base, and the cover plate has several clearance holes for avoiding electronic components on the circuit board.

[0009] By adopting the above technical solution, when the operator installs the circuit board on the fixture, the mounting base can be removed from the base and placed on the worktable. The cover plate on top of the mounting base can be opened to expose the mounting area on the surface of the mounting base. Subsequently, the operator can quickly install the circuit board in the mounting area using the positioning structure within the mounting area. After the circuit board is fixed, the operator can place the cover plate on the surface of the circuit board to position the top of the circuit board. After the operator reinstalls the mounting base on the base, the mounting base and the base can be placed together on the reflow soldering conveyor belt. Through the fixture, multiple circuit boards can be installed simultaneously, increasing the number of circuit boards that can be soldered at the same time in the reflow oven and improving the efficiency of the reflow oven.

[0010] Preferably, the top of the base is fixedly connected to two parallel support plates, and the top of the base is fixedly connected to four L-shaped limiting members. The four limiting members are respectively located at both ends of the two support plates, the mounting base is located at the top of the two support plates, and the four limiting members are respectively limited at the four corners of the mounting base.

[0011] By adopting the above technical solution, the mounting base can be positioned above the top of the base through the arrangement of two support plates. This facilitates contact between the heat transfer gas in the reflow oven cavity and the bottom of the mounting base, improving the uniformity of heating of the circuit board. Four limiting components can position the four corners of the mounting base, reducing the likelihood of swaying or shifting during base transport.

[0012] Preferably, the positioning structure includes a plurality of positioning posts integrally formed on the top surface of the mounting base, the positioning posts extending into positioning holes on the circuit board.

[0013] By adopting the above technical solution, when installing the circuit board in the installation area, the operator can align the positioning hole at the corner of the circuit board with the positioning post in the installation area, so that the positioning post extends into the positioning hole. This makes it easier for the operator to quickly install the circuit board in the corresponding installation area and reduces the occurrence of circuit board misalignment when flipping the cover later.

[0014] Preferably, the mounting base has through holes on both the left and right sides of any mounting area.

[0015] By adopting the above technical solution, the contact area between the circuit board and the heat transfer medium gas can be further increased through the setting of through holes, while also making it easier for operators to hold the circuit board with their fingers for disassembly or installation.

[0016] Preferably, a hinge is provided between the mounting base and the cover plate. The hinge includes a first hinge and a second hinge. The first hinge is fixedly connected to the mounting base by bolts, and the second hinge is fixedly connected to the cover plate by bolts.

[0017] By adopting the above technical solution, the connection between the cover plate and the mounting base can be realized through the hinge, and the cover plate can be flipped.

[0018] Preferably, a handle is fixedly connected to the top of the cover plate.

[0019] By adopting the above technical solution, the handle design can improve the ease with which operators can open or close the cover.

[0020] Preferably, hand grips are fixedly connected to both sides of the mounting base.

[0021] By adopting the above technical solution, the hand grip can be easily disassembled or installed by the operator.

[0022] Preferably, each of the hand grips is covered with a heat-insulating sleeve.

[0023] By adopting the above technical solution, the installation of the heat insulation sleeve can prevent operators from being burned by the preheated handle when removing the mounting base from the discharge conveyor belt of the reflow oven.

[0024] Preferably, the base has two through-holes, and the two through-holes are located directly below the two hand grips.

[0025] By adopting the above technical solution, the weight of the base can be reduced through the notch, while the ease of holding the hand grip can be further improved when the operator disassembles or installs the mounting base.

[0026] In summary, the circuit board reflow soldering fixture of this application has at least one of the following beneficial technical effects:

[0027] 1. When the operator installs the circuit board on the fixture, the mounting base can be removed from the base and placed on the workbench. The cover plate on the top of the mounting base can be opened to expose the mounting area on the surface of the mounting base. Then, the operator can quickly install the circuit board in the mounting area using the positioning structure in the mounting area. Since the mounting base has multiple mounting areas, multiple circuit boards can be placed on the mounting base at the same time. After the operator reinstalls the mounting base on the base, the mounting base and the base can be placed together on the reflow soldering conveyor belt, which can increase the number of circuit boards that can be soldered at the same time in the reflow soldering oven and improve the efficiency of the reflow soldering oven.

[0028] 2. When installing the circuit board in the installation area, the operator can align the positioning holes at the corners of the circuit board with the positioning posts in the installation area, so that the positioning posts extend into the positioning holes. This makes it easier for the operator to quickly install the circuit board in the corresponding installation area and reduces the occurrence of circuit board misalignment when flipping the cover later. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating the overall structure of the fixing fixture in an embodiment of this application.

[0030] Figure 2 This is a schematic diagram illustrating the overall structure of the base in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram illustrating the overall structure of the mounting base in an embodiment of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Base; 11. Support plate; 12. Limiting component; 13. Notch; 2. Mounting base; 21. Positioning post; 22. Through hole; 23. Hand grip; 24. Heat insulation sleeve; 3. Cover plate; 31. Clearance hole; 32. Handle; 4. Circuit board; 41. Positioning hole; 5. Hinge. Detailed Implementation

[0033] The following combination Figures 1-3 This application will be described in further detail.

[0034] Example

[0035] This application discloses a fixture for reflow soldering circuit boards. (Refer to...) Figures 1-3 It mainly includes a base 1 and a mounting base 2, which are detachably connected. A space for the flow of heating medium gas is formed between the mounting base 2 and the base 1. The mounting base 2 is fixedly connected to four mounting areas for mounting circuit boards 4, which are evenly arranged in two rows and two columns. Each mounting area is provided with a positioning structure to limit the position of the circuit board 4. A cover plate 3 is hinged to the mounting base 2, and several clearance holes 31 are opened through the cover plate 3 to avoid electronic components on the circuit board 4.

[0036] When the operator installs circuit board 4 onto the fixture, they can first remove the mounting base 2 from the base 1 and place it on the workbench. Then, the cover plate 3 on top of the mounting base 2 is opened to expose the mounting area. The operator can then quickly install the circuit board 4 into the mounting area using the positioning structure within the mounting area. After securing the circuit board 4, the operator can place the cover plate 3 over the surface of the circuit board 4 to position its top. After reinstalling the mounting base 2 onto the base 1, the operator can place the mounting base 2 and base 1 together on the reflow oven conveyor belt. Using the fixture, multiple circuit boards 4 can be installed simultaneously, increasing the number of circuit boards 4 that can be soldered at the same time in the reflow oven and improving the efficiency of the reflow oven.

[0037] Reference Figure 1 and Figure 2The top of the base 1 is fixedly connected to two parallel support plates 11, and the axial direction of the two support plates 11 is along the width direction of the mounting base 2. The top of the base 1 is fixedly connected to four L-shaped limiting members 12, which are located at both ends of the two support plates 11 respectively. The mounting base 2 is located on the top of the two support plates 11, and the four limiting members 12 are respectively limited at the four corners of the mounting base 2.

[0038] The two support plates 11 allow the mounting base 2 to be positioned above the top of the base 1, facilitating contact between the heat transfer gas in the reflow oven cavity and the bottom of the mounting base 2, thus improving the uniformity of heating of the circuit board 4. The four limiting members 12 can position the four corners of the mounting base 2, reducing the occurrence of shaking or displacement of the mounting base 2 during the transport of the base 1.

[0039] Reference Figure 3 The positioning structure includes two positioning posts 21 integrally formed on the top surface of the mounting base 2. The positioning holes 41 of the circuit board 4 are located diagonally opposite each other. The positions of the two positioning posts 21 are adapted to the positions of the two positioning holes 41. The positioning posts 21 extend into the positioning holes 41 on the circuit board 4, and the height of the positioning posts 21 is less than the depth of the positioning holes 41.

[0040] When installing the circuit board 4 in the installation area, the operator can align the positioning hole 41 at the corner of the circuit board 4 with the positioning post 21 in the installation area, so that the positioning post 21 extends into the positioning hole 41. This makes it easier for the operator to quickly install the circuit board 4 in the corresponding installation area and reduces the occurrence of the circuit board 4 shifting when the cover plate 3 is flipped later.

[0041] In some other embodiments, depending on the actual installation needs, positioning protrusions that fit the corners of the circuit board 4 can also be provided in the installation area, which is not limited here.

[0042] In this embodiment, through holes 22 are provided on both the left and right sides of any mounting area on the mounting base 2. The through holes 22 can further increase the contact area between the circuit board 4 and the heat transfer gas, and at the same time make it easier for the operator to hold the circuit board 4 with their fingers for disassembly or installation.

[0043] It should be noted that, in order to further reduce the volume of the mounting base 2, in this embodiment, two mounting areas on the same straight line share a through hole 22.

[0044] A hinge 5 is provided between the mounting base 2 and the cover plate 3. The hinge 5 includes a first hinge and a second hinge. The first hinge is fixedly connected to the mounting base 2 by bolts, and the second hinge is fixedly connected to the cover plate 3 by bolts. The hinge 5 enables the connection between the cover plate 3 and the mounting base 2, and also allows the cover plate 3 to be flipped.

[0045] Reference Figure 1 A handle 32 is fixedly connected to the top of the cover plate 3, and the handle 32 is located at the end of the cover plate 3 away from the hinge 5.

[0046] The handle 32 improves the ease with which operators can open or close the cover 3.

[0047] Reference Figure 1 and Figure 3 Hand handles 23 are fixedly connected to the front and rear sides of the mounting base 2. The hand handles 23 facilitate the operator to disassemble or install the mounting base 2.

[0048] In this embodiment, heat insulation sleeves 24 are provided on all hand grips 23. The heat insulation sleeves 24 can prevent operators from being burned by the preheating of the hand grips 23 when removing the mounting base 2 from the discharge conveyor belt of the reflow oven.

[0049] Reference Figure 1 Two notches 13 are formed through the base 1, located directly below the two hand grips 23. The notches 13 reduce the weight of the base 1 and further improve the ease of holding the hand grips 23 when the operator disassembles or installs the mounting base 2.

[0050] The implementation principle of a circuit board reflow soldering fixture according to an embodiment of this application is as follows: When the operator installs the circuit board 4 on the fixture, the mounting seat 2 on the base 1 can be removed and placed on the workbench, and the cover plate 3 on the top of the mounting seat 2 can be opened to expose the mounting area on the surface of the mounting seat 2. Then, the operator can quickly install the circuit board 4 in the mounting area through the positioning structure in the mounting area. Since the mounting seat 2 is provided with multiple mounting areas, multiple circuit boards 4 can be placed on the mounting seat 2 at the same time. After the operator reinstalls the mounting seat 2 on the base 1, the mounting seat 2 and the base 1 can be placed together on the reflow soldering conveyor belt, which can increase the number of circuit boards 4 soldered by the reflow soldering furnace at the same time and improve the efficiency of the reflow soldering furnace.

[0051] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fixture for reflow soldering circuit boards, characterized in that, It includes a base (1) and a mounting base (2), the base (1) and the mounting base (2) are detachably connected, a space for the flow of heating medium gas is formed between the mounting base (2) and the base (1), and the mounting base (2) is fixedly connected to several mounting areas for mounting circuit boards (4), and each mounting area is provided with a positioning structure for limiting the position of the circuit board (4). A cover plate (3) is hinged to the mounting base (2), and a plurality of clearance holes (31) are provided on the cover plate (3) to avoid electronic components on the circuit board (4).

2. The circuit board reflow soldering fixture according to claim 1, characterized in that, The top of the base (1) is fixedly connected to two parallel support plates (11), and the top of the base (1) is fixedly connected to four L-shaped limiting members (12). The four limiting members (12) are located at the two ends of the two support plates (11), and the mounting base (2) is located at the top of the two support plates (11). The four limiting members (12) are respectively limited at the four corners of the mounting base (2).

3. A circuit board reflow soldering fixture according to claim 2, characterized in that, The positioning structure includes a plurality of positioning posts (21) integrally formed on the top surface of the mounting base (2), and the positioning posts (21) extend into the positioning holes (41) on the circuit board (4).

4. A circuit board reflow soldering fixture according to claim 3, characterized in that, The mounting base (2) has through holes (22) on both the left and right sides of any mounting area.

5. A circuit board reflow soldering fixture according to claim 4, characterized in that, A hinge (5) is provided between the mounting base (2) and the cover plate (3). The hinge (5) includes a first hinge and a second hinge. The first hinge is fixedly connected to the mounting base (2) by bolts, and the second hinge is fixedly connected to the cover plate (3) by bolts.

6. A circuit board reflow soldering fixture according to claim 5, characterized in that, A handle (32) is fixedly connected to the top of the cover plate (3).

7. A circuit board reflow soldering fixture according to claim 6, characterized in that, Hand grips (23) are fixedly connected to both sides of the mounting base (2).

8. A circuit board reflow soldering fixture according to claim 7, characterized in that, Each of the hand grips (23) is fitted with a heat insulation sleeve (24).

9. A circuit board reflow soldering fixture according to claim 8, characterized in that, The base (1) has two through-holes (13) located directly below the two hand grips (23).

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