Assembly jig and assembly method of circuit board

Abstract

The application provides an assembling jig and an assembling method of a circuit board. One end of the assembling jig is provided with a holding part. The other end of the assembling jig away from the holding part is provided with an abutting surface. The abutting surface is used for abutting a preset area on the board surface of the circuit board away from the connector. The preset area is an area farther away from the one end of the connector than the sealant. In the application, the preset area on the circuit board is abutted by the assembling jig in the assembling process of the circuit board and the frame. The original force application point is transferred to the front side of the sealant. The sealant connection position is not affected by the applied force. The probability of damage of the circuit board glue path is reduced. The sealing property of the sealant is maintained. The yield is improved.

Description

Technical Field

[0001] This invention relates to the field of auxiliary assembly fixture technology, and particularly to an assembly fixture and a method for assembling a circuit board. Background Technology

[0002] Circuit boards in electronic products are generally waterproof (e.g., IP68 waterproof circuit boards), which places special requirements on the airtightness of the circuit board. The circuit board and the frame are sealed with liquid silicone on the connector (e.g., Type-C interface). The connector and the circuit board need to be powered and transmit information. The conductive terminals of the connector are soldered to the circuit board to fix the connector and the circuit board in place. The connector and the circuit board are then sealed with sealant.

[0003] Existing circuit board assembly lines generally use toolingless manual assembly; please refer to [link / reference]. Figure 1 During the manual assembly of circuit board 1a and frame 2a, after one end of circuit board 1a contacts the limiting point 21a on frame 2a, force is applied to the tail end of circuit board 1a away from the limiting point 21a, thereby securing circuit board 1a into frame 2a. When force is applied to the tail end of circuit board 1a, the connection between connector 3a and circuit board 1a is subjected to a reaction force. This reaction force causes the connection to loosen, creating a gap, damaging the sealant 4a, resulting in poor airtightness and affecting product yield. Summary of the Invention

[0004] The purpose of this invention is to provide an assembly jig and a method for assembling a circuit board, which aims to solve the problem that the sealing adhesive of the circuit board is easily damaged during the assembly process of the existing circuit board and frame, resulting in poor airtightness.

[0005] To solve the above-mentioned technical problems, embodiments of the present invention provide an assembly fixture for assembling circuit boards, wherein a connector is provided on the circuit board, a sealant is provided at the electrical connection between the circuit board and the connector, and a gripping part is provided at one end of the assembly fixture;

[0006] The assembly fixture has an abutment surface at one end away from the gripping part. The abutment surface is used to abut against a predetermined area on the board surface of the circuit board away from the connector. The predetermined area is the area further away from the end of the circuit board away from the connector than the sealant.

[0007] This invention uses an assembly fixture to press against a predetermined area on the circuit board during the assembly process of the circuit board and the frame, transferring the original force point to the front of the sealant. The sealant joint is not affected by the applied force, reducing the probability of damage to the sealant path on the circuit board, thereby maintaining the sealant's sealing performance and improving the yield rate.

[0008] Preferably, in the assembly fixture, the end of the assembly fixture away from the gripping part is provided with a mounting surface facing the same direction as the abutment surface, and a boss is provided on the mounting surface, the end face of the boss away from the mounting surface forming the abutment surface.

[0009] Preferably, in the assembly fixture, a plurality of bosses are provided at intervals on the mounting surface along a direction perpendicular to the extension direction of the gripping portion.

[0010] Preferably, in the assembly fixture, one end of the assembly fixture away from the gripping part has a protrusion protruding in a direction perpendicular to the abutment surface, and the end face of the protrusion in the protrusion direction forms the mounting surface.

[0011] Preferably, in the assembly fixture, the end face of the protrusion near the gripping part in the extending direction of the gripping part is an inclined surface, and the inclined surface is inclined in the protruding direction of the protrusion away from the gripping part.

[0012] Preferably, in the assembly fixture, a positioning part is provided at one end of the assembly fixture where the abutment surface is provided, and the positioning part is used to position and cooperate with the mating part on the circuit board.

[0013] Preferably, in the assembly fixture, when the mating part is a positioning hole, the positioning part is a positioning post protruding from the abutment surface.

[0014] Preferably, in the assembly fixture, when an annular stepped surface is provided on the inner wall of the positioning hole, an annular abutment surface is provided on the positioning post, the orientation of the annular abutment surface is the same as the orientation of the abutment surface, and the annular abutment surface is used to abut against the annular stepped surface.

[0015] Preferably, in the assembly fixture, the shape of the positioning post is adapted to the shape of the positioning hole.

[0016] Preferably, in the assembly fixture, the extending direction of the gripping portion intersects with the orientation of the abutment surface.

[0017] Preferably, in the assembly fixture, the gripping part is arranged in a rod shape.

[0018] To achieve the above objectives, the present invention also provides a method for assembling a circuit board, comprising:

[0019] When the connector is mounted on the circuit board, the electrical connection between the circuit board and the connector is sealed with sealant.

[0020] The circuit board is placed on the frame such that one end of the circuit board with the connector abuts against the limiting point on the frame;

[0021] The circuit board is inserted into the frame by a pre-defined area on the board surface away from the connector, whereby the assembly fixture presses against the board surface. The pre-defined area is the area further away from the end of the circuit board away from the connector than the sealant. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a schematic diagram illustrating the principle of assembling a circuit board and a frame in the prior art;

[0024] Figure 2 This is a schematic diagram of the circuit board structure;

[0025] Figure 3 This is a schematic diagram of the structure of an assembly fixture provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0027] Figure 5 For use Figure 3 A schematic diagram illustrating the principle of assembling circuit boards and frames using a mid-assembly fixture;

[0028] Figure 6 This is a schematic flowchart illustrating a circuit board assembly method provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in existing technology:

[0030] 1a circuit board 3a connector 2a frame 4a sealant 21a Limit point

[0031] Explanation of reference numerals in the accompanying drawings of this invention:

[0032] 100 Assembly jig 62 Annular contact surface 1 grip section 200 circuit board 2 contact surface 210 connector 3 Mounting surface 211 conductive terminals 4 boss 220 positioning holes 5 Protrusion 230 sealant 51 bevel 300 frame 6 Positioning Department 310 Limit point 61 Positioning Post

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] Please see Figure 2 A connector 210 is provided on the circuit board 200, and a sealant 230 is provided at the electrical connection between the circuit board 200 and the connector 210.

[0038] Specifically, a connector 210 is provided on one side of the circuit board 200. The conductive terminals 211 of the connector 210 are soldered to the circuit board 200 by means of soldering or other methods to fix the connector 210 to the circuit board 200 and realize the electrical connection between the circuit board 200 and the connector 210. After fixing the connector 210 to the circuit board 200, sealant 230 is applied at the connection between the circuit board 200 and the connector 210.

[0039] Connector 210 is typically located at the end of circuit board 200. Hereinafter, the end of circuit board 200 with connector 210 is defined as the beginning of circuit board 200, and the end of circuit board 200 furthest from connector 210 is defined as the end of circuit board 200. The surface of circuit board 200 with connector 210 is defined as the front side of circuit board 200, and the surface of circuit board 200 furthest from connector 210 is defined as the back side of circuit board 200. Therefore, sealant 230 is applied to the front side of circuit board 200.

[0040] Please see Figure 5 During the assembly process of the circuit board 200 and the frame 300, the circuit board 200 can be placed on the frame 300 with the front of the circuit board 200 facing the inside of the frame 300 and the front end of the circuit board 200 abutting against the limiting point 310 on the frame 300. Then, force is applied to the back of the circuit board 200 to assemble the circuit board 200 into the frame 300.

[0041] To facilitate the assembly of the circuit board 200 into the frame 300, the present invention provides an assembly fixture that can be used for assembling the circuit board 200 and the frame 300. Figure 3 and Figure 4 A preferred embodiment of the assembly fixture provided by the present invention is shown.

[0042] Please see Figure 3 and Figure 4 In this embodiment, one end of the assembly fixture 100 is provided with a gripping part 1; the end of the assembly fixture 100 away from the gripping part 1 is provided with an abutting surface 2, which is used to abut against a preset area (not shown in the figure) on the board surface of the circuit board 200 away from the connector 210. The preset area is the area further away from the end of the circuit board 200 away from the connector 210 than the sealant 230.

[0043] Specifically, the preset area is an area pre-selected on the back of the circuit board 200, and the distance from the preset area to the tail end of the circuit board 200 is greater than the distance from the sealant 230 to the tail end of the circuit board 200.

[0044] During the assembly process of the circuit board 200 and the frame 300, the operator can hold the gripping part 1 of the assembly fixture 100 and align the contact surface 2 of the assembly fixture 100 with the preset area of ​​the circuit board 200. Then, the assembly fixture 100 applies force to the preset area of ​​the circuit board 200 to push the circuit board 200 into the frame 300. In this way, the point of force application on the circuit board 200 is shifted from the tail end of the circuit board 200 to the preset area of ​​the circuit board 200, the torque is shortened, and the point of force application on the circuit board 200 is on the front side of the sealant 230 (the front side of the sealant 230 is the side of the sealant 230 near the head end of the circuit board 200). Therefore, the joint of the sealant 230 is not affected by the applied force. Through actual production verification and comparison, the defect rate of assembling the circuit board 200 by applying force to the tail end is about 2%, while the defect rate after using the assembly fixture 100 is reduced to about 1%, which greatly reduces the generation of defective materials, reduces maintenance operations such as reflow, and solves the defect problem in the assembly of low-cost waterproof circuit boards.

[0045] Optionally, in this embodiment, the preset area and a portion of the conductive terminal 211 of the connector 210 are opposite each other in a direction perpendicular to the surface of the circuit board 200, so that the point of force application on the circuit board 200 is located at the conductive terminal 211.

[0046] This invention uses an assembly fixture 100 to press against a preset area on the circuit board 200 during the assembly process of the circuit board 200 and the frame 300, thereby transferring the original force application point to the front of the sealant 230. The joint of the sealant 230 will not be affected by the applied force, reducing the probability of damage to the sealant path of the circuit board 200, thus maintaining the sealing performance of the sealant 230 and improving the yield rate.

[0047] When the operator uses the assembly jig 100, they can hold the grip part 1 of the assembly jig 100 by hand. The specific shape of the grip part 1 is not particularly limited. Optionally, please refer to Figure 3 In this embodiment, the gripping part 1 is arranged in the shape of a rod, and the gripping part 1 is arranged in the shape of a straight rod extending along a straight line. By arranging the gripping part 1 in the shape of a straight rod, the lever arm of the assembly fixture 100 can be increased, so that it is easier to apply force to the circuit board 200 when operating the assembly fixture 100.

[0048] The assembly fixture 100 abuts against a predetermined area on the back of the circuit board 200 via the abutment surface 2. The orientation of the abutment surface 2 can be the same as the extension direction of the gripping part 1, that is, the extension direction of the gripping part 1 is perpendicular to the abutment surface 2; the extension direction of the gripping part 1 can also intersect with the orientation of the abutment surface 2, for example, see [reference needed]. Figure 3 and Figure 4 In this embodiment, the extending direction of the gripping part 1 is perpendicular to the orientation of the contact surface 2.

[0049] The assembly fixture 100 has an abutment surface 2 at the end away from the gripping part 1. Optionally, please refer to... Figure 3 and Figure 4 In this embodiment, the assembly fixture 100 has a mounting surface 3 facing the same direction as the abutment surface 2 at one end away from the gripping part 1. A boss 4 protrudes from the mounting surface 3, and the end face of the boss 4 away from the mounting surface 3 forms the abutment surface 2. By providing a boss 4 on the end face of the assembly fixture 100 and using the end face of the boss 4 as the abutment surface 2, that is, by abutting the circuit board 200 with the boss 4, interference is less likely to occur between the electrical components on the circuit board 200 and the assembly fixture 100.

[0050] The specific shape of the boss 4 is not particularly limited; for example, the boss 4 can be a circular frustum, a square frustum, a trapezoidal frustum, etc. Alternatively, please refer to... Figure 3 and Figure 4 In this embodiment, the boss 4 is a square platform.

[0051] The specific number of bosses 4 is not specifically limited. One or more bosses 4 can be provided on the mounting surface 3. Optionally, please refer to [link / reference]. Figure 3 and Figure 4 In this embodiment, a plurality of protrusions 4 are provided on the mounting surface 3 at intervals along a direction perpendicular to the extending direction of the grip portion 1. Each protrusion 4 has an abutment surface 2 formed on its end face away from the mounting surface 3. The plurality of protrusions 4 form a plurality of abutment surfaces 2. The plurality of protrusions 4 are arranged at intervals parallel to the mounting surface 3, and the direction of the plurality of protrusions 4 is perpendicular to the extending direction of the grip portion 1. For example, two protrusions 4 are provided at intervals, and these two protrusions 4 are located at opposite ends of the mounting surface 3 in the direction of the interval arrangement of the two protrusions 4.

[0052] Optionally, please refer to Figure 3 and Figure 4 In this embodiment, the assembly fixture 100 has a protrusion 5 at one end away from the gripping part 1, protruding in a direction perpendicular to the abutment surface 2. The end face of the protrusion 5 in the protrusion direction forms a mounting surface 3. The protrusion 5 faces the same direction as the abutment surface 2 in the protrusion direction. The protrusion 5 is provided at one end of the assembly fixture 100, and a boss 4 is formed on the protrusion 5. In this way, when assembling the circuit board 200 and the frame 300 through the assembly fixture 100, the assembly fixture 100 is less likely to interfere with the circuit board 200 and the frame 300.

[0053] For further information, please refer to [link / reference]. Figure 3 and Figure 4 In this embodiment, the end face of the protrusion 5 near the gripping part 1 in the extending direction of the gripping part 1 is a slope 51, and the slope 51 is inclined away from the gripping part 1 in the protruding direction of the protrusion 5. By providing the slope 51 on the protrusion 5, a clearance space is formed on the side of the protrusion 5 near the gripping part 1.

[0054] Optionally, in this embodiment, the assembly fixture 100 has a positioning part 6 at one end where the abutment surface 2 is provided. The positioning part 6 is used to position and engage with the mating part on the circuit board 200. When the abutment surface 2 of the assembly fixture 100 abuts against a preset area of ​​the circuit board 200, the positioning part 6 on the assembly fixture 100 and the mating part on the circuit board 200 form a positioning engagement, thereby realizing the positioning between the assembly fixture 100 and the circuit board 200, which facilitates aligning the abutment surface 2 of the assembly fixture 100 with the preset area of ​​the circuit board 200.

[0055] The specific arrangement of the positioning part 6 on the assembly fixture 100 and the mating part on the circuit board 200 can be configured according to actual conditions. For example, the positioning part 6 and the mating part can be two abutting surfaces, or mating protrusions and grooves, etc. Optionally, please refer to Figures 2 to 4In this embodiment, when the mating part is a positioning hole 220, the positioning part 6 is a positioning post 61 protruding from the abutment surface 2.

[0056] Specifically, the circuit board 200 is provided with positioning holes 220. The positioning holes 220 can be existing process holes on the circuit board 200, or through holes for screws to pass through, etc. The positioning holes 220 can also be newly added holes on the circuit board 200 corresponding to the positioning posts 61. Each abutment surface 2 is provided with one or more positioning posts 61. When the abutment surface 2 of the assembly fixture 100 abuts against the preset area of ​​the circuit board 200, the positioning post 61 extends into the corresponding positioning hole 220.

[0057] The shapes of the positioning pin 61 and the positioning hole 220 are usually adapted to each other, for example, see [reference needed]. Figures 2 to 4 In this embodiment, the positioning post 61 is a cylinder and the positioning hole 220 is a round hole.

[0058] Optionally, please refer to Figure 3 and Figure 4 In this embodiment, when an annular stepped surface (not shown in the figure) is provided on the inner wall of the positioning hole 220, an annular abutment surface 62 is provided on the positioning post 61. The orientation of the annular abutment surface 62 is the same as that of the abutment surface 2, and the annular abutment surface 62 is used to abut against the annular stepped surface. The positioning hole 220 is a stepped hole, thereby forming an annular stepped surface on the inner wall of the positioning hole 220, and the orientation of the annular stepped surface is the same as that of the back side of the circuit board 200. The diameter of the end of the positioning post 61 near the abutment surface 2 is larger than the diameter of the end of the positioning post 61 away from the abutment surface 2, so that an annular abutment surface 62 is formed on the positioning post 61. When the positioning post 61 extends into the positioning hole 220, the annular abutment surface 62 abuts against the annular stepped surface.

[0059] This invention also provides a method for assembling a circuit board; please refer to [link / reference]. Figure 6 In this embodiment, the assembly method of the circuit board includes, but is not limited to, the following steps:

[0060] Step S610: With the connector 210 mounted on the circuit board 200, seal the electrical connection between the circuit board 200 and the connector 210 with sealant 230.

[0061] Specifically, connector 210 is disposed on the front side of circuit board 200 and is located at the beginning of circuit board 200. The conductive terminals 211 of connector 210 are soldered to circuit board 200 by means of soldering or the like to fix connector 210 to circuit board 200 and realize electrical connection between circuit board 200 and connector 210.

[0062] Sealant 230 is applied to the front side of circuit board 200 and at the electrical connection between circuit board 200 and connector 210.

[0063] Step S620: Place the circuit board 200 on the frame 300, such that one end of the circuit board 200 with the connector 210 abuts against the limiting point 310 on the frame 300.

[0064] Specifically, after the connector 210 is installed on the front side of the circuit board 200, the circuit board 200 is placed on the frame 300 such that the front side of the circuit board 200 faces the inside of the frame 300, and the first end of the circuit board 200 abuts against the limiting point 310 on the frame 300.

[0065] Step S630: The assembly fixture 100 abuts against a preset area on the surface of the circuit board 200 away from the connector 210, so that the circuit board 200 is installed in the frame 300. The preset area is the area further away from the end of the circuit board 200 away from the connector 210 than the sealant 230.

[0066] Specifically, the assembly fixture 100 can be the assembly fixture 100 in the above embodiment. The operator can hold the gripping part 1 of the assembly fixture 100 and align the contact surface 2 of the assembly fixture 100 with the preset area of ​​the circuit board 200. Then, the assembly fixture 100 applies force to the preset area of ​​the circuit board 200 to push the circuit board 200 into the frame 300.

[0067] Since the preset area on the circuit board 200 is located in front of the sealant 230, the point of force application on the circuit board 200 is shifted from the tail end of the circuit board 200 to the preset area of ​​the circuit board 200, the torque is shortened. At the same time, since the point of force application on the circuit board 200 is in front of the sealant 230, the joint of the sealant 230 will not be affected by the applied force, thus reducing the probability of damage to the sealant of the circuit board 200.

[0068] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A method for assembling a circuit board, characterized in that, include: When the connector is mounted on the circuit board, the electrical connection between the circuit board and the connector is sealed with sealant. The circuit board is placed on the frame such that one end of the circuit board with the connector abuts against the limiting point on the frame; The assembly fixture abuts against a predetermined area on the board surface of the circuit board away from the connector, thereby inserting the circuit board into the frame. The predetermined area is the area further away from the circuit board and the connector than the sealant. One end of the assembly fixture is provided with a gripping part, the end of the assembly fixture away from the gripping part is provided with the abutting surface, and the end of the assembly fixture with the abutting surface is provided with a positioning part, which is used to position and cooperate with the mating part on the circuit board.

2. The circuit board assembly method as described in claim 1, characterized in that, The assembly fixture has a mounting surface at one end away from the gripping part, which faces the same direction as the abutment surface. A boss is protruding from the mounting surface, and the end face of the boss away from the mounting surface forms the abutment surface.

3. The circuit board assembly method as described in claim 2, characterized in that, The mounting surface is provided with a plurality of protrusions at intervals along a direction perpendicular to the extension direction of the grip portion.

4. The circuit board assembly method as described in claim 2, characterized in that, The assembly fixture has a protrusion at one end away from the gripping part, which protrudes in a direction perpendicular to the abutment surface, and the end face of the protrusion in the protruding direction forms the mounting surface.

5. The circuit board assembly method as described in claim 4, characterized in that, The protrusion is inclined at its end face near the grip in the extending direction of the grip, and the inclined surface is tilted away from the grip in the protruding direction of the protrusion.

6. The circuit board assembly method as described in claim 1, characterized in that, When the mating part is a positioning hole, the positioning part is a positioning post protruding from the abutment surface.

7. The circuit board assembly method as described in claim 6, characterized in that, When an annular stepped surface is provided on the inner wall of the positioning hole, an annular abutment surface is provided on the positioning post, the orientation of the annular abutment surface being the same as that of the abutment surface, and the annular abutment surface being used to abut against the annular stepped surface; and / or, The shape of the positioning post is adapted to the shape of the positioning hole.

8. The method for assembling a circuit board as described in any one of claims 1-5, characterized in that, The extending direction of the gripping portion intersects with the orientation of the abutting surface; and / or, The grip portion is rod-shaped.

Images