Positioning jig and positioning method for PCB board of LED display screen

Abstract

The application provides a positioning jig and a positioning method for a PCB of an LED display screen, and the positioning jig for the PCB of the LED display screen comprises: a base provided with a containing cavity, wherein the base is provided with an air outlet communicated with the containing cavity, and the top wall of the base is provided with a plurality of first adsorption channels communicated with the containing cavity and arranged at intervals; a plurality of supporting seats are arranged above the base, the bottom wall of each supporting seat is attached to the top wall of the base, each supporting seat is provided with a second adsorption channel penetrating through the top wall and the bottom wall and communicated with the first adsorption channels, each second adsorption channel is arranged correspondingly to one first adsorption channel, and the top walls of the plurality of supporting seats jointly form a supporting surface for supporting the PCB. Through the technical scheme, the problem that the front surface of the PCB in the related art does not have sufficient space for positioning can be solved.

Description

Technical Field

[0001] This invention relates to the field of electronic product technology, and more specifically, to a positioning fixture and positioning method for a PCB board used in LED displays. Background Technology

[0002] LED displays mainly consist of LED light boards and a housing. The LED light board includes a PCB board, LED chips on the front of the PCB board, and electronic components on the back of the PCB board. The electronic components are mounted on the PCB board for electrical connection, thereby controlling the LED chips. Surface mount technology (SMT) is used to mount leadless or short-lead surface mount components onto the surface of the PCB board, and then soldering them together using methods such as reflow soldering.

[0003] In related technologies, during the surface mount and reflow soldering processes, PCB boards need to be supported and positioned using fixtures to prevent deformation during processing.

[0004] However, the fixtures in related technologies require support on the back of the PCB board and positioning on the front. With these fixtures, the front of the PCB board is covered with pads and LEDs, leaving insufficient space for positioning. Summary of the Invention

[0005] This invention provides a positioning fixture and positioning method for PCB boards used in LED displays, in order to solve the problem that there is not enough space on the front side of the PCB board for positioning in related technologies.

[0006] According to one aspect of the present invention, a positioning fixture for a PCB board of an LED display screen is provided. The positioning fixture for the PCB board of an LED display screen includes: a base having a receiving cavity, the base having an air extraction port communicating with the receiving cavity, and the top wall of the base having a plurality of first adsorption channels communicating with and spaced apart from the receiving cavity; a plurality of support seats, all positionably disposed above the base, the bottom wall of each support seat being abutted against the top wall of the base, each support seat having a second adsorption channel penetrating its top wall and bottom wall and communicating with the first adsorption channels, each second adsorption channel being correspondingly disposed with and communicating with a first adsorption channel, and the top walls of the plurality of support seats collectively forming a support surface for supporting the PCB board of the LED display screen.

[0007] Furthermore, the number of first adsorption channels exceeds the number of support seats, and multiple support seats are movably arranged above the base. The second adsorption channels of the multiple support seats are connected to some of the first adsorption channels in the multiple first adsorption channels, and the remaining first adsorption channels in the multiple first adsorption channels are blocked.

[0008] Furthermore, the positioning fixture for the PCB board used in the LED display also includes sealing tape, and the remaining first adsorption channels are sealed by the sealing tape.

[0009] Furthermore, the support base includes a connecting section and a support section connected together. The cross-sectional dimension of the connecting section is larger than that of the support section. The bottom wall of the connecting section fits into the top wall of the base. The top walls of multiple support sections together form a support surface.

[0010] Furthermore, the second adsorption channel includes a large-diameter section and a small-diameter section that are connected to each other. The large-diameter section is located below the small-diameter section, and the cross-sectional dimension of the large-diameter section is larger than the cross-sectional dimension of the first adsorption channel.

[0011] Furthermore, the positioning fixture for the PCB board of the LED display also includes a magnetic component mounted on a support base, and the base has a magnetic component that magnetically engages with the magnetic component.

[0012] Furthermore, the positioning fixture for the PCB board of the LED display screen also includes multiple first sealing rings extending circumferentially along the support base. Each support base has a first receiving groove on its bottom wall, and the first sealing ring is located in the first receiving groove. The two sides of the first sealing ring are respectively attached to the top wall of the base and the bottom wall of the support base.

[0013] Furthermore, the base includes a seat body and a cover body covering the seat body. A receiving cavity is provided in the seat body, an air extraction port is provided in the side wall of the seat body, the bottom wall of the support seat is attached to the top wall of the cover body, and the cover body is made of iron.

[0014] Furthermore, the base also includes a second sealing ring extending circumferentially along the seat body. The top wall of the seat body is provided with a second receiving groove, and the second sealing ring is located in the second receiving groove. The two sides of the second sealing ring are respectively attached to the bottom wall of the cover body and the top wall of the seat body.

[0015] According to another aspect of the present invention, a method for positioning a PCB board of an LED display screen is provided. The method involves positioning the PCB board using a positioning fixture for the PCB board of the LED display screen. The method includes: determining the number of support seats and the positions of the support seats on a base based on the PCB board; setting multiple support seats on the base according to the determined number of support seats and the positions of the support seats on the base; supporting the PCB board on the multiple support seats; and evacuating air through an air extraction port, a receiving cavity, a first adsorption channel on the base, and a second adsorption channel on the support seats to adsorb the PCB board.

[0016] Furthermore, the steps of determining the number of support bases and their positions on the base based on the PCB board include: determining the number of support bases and their positions on the base based on the size of the PCB board and the positions of the components on the back of the PCB board.

[0017] According to the technical solution of this invention, a positioning fixture for a PCB board of an LED display screen includes a base and multiple support seats. When using this positioning fixture, multiple support seats are placed on the base, with the bottom wall of the support seat abutting against the top wall of the base. The second adsorption channel of each support seat is connected to the corresponding first adsorption channel of the base. The back of the PCB board is placed on the support surface, and the support seats support the PCB board. An air extraction machine is connected to the air extraction port of the base, and air is extracted sequentially through the air extraction port, the receiving cavity, the first adsorption channel, and the second adsorption channel. This creates a negative pressure at the top wall of the support seat in the second adsorption channel, which then adheres the PCB board to the support surface formed by the top walls of the multiple support seats. Since the back of the PCB board is used for support and positioning, the front of the PCB board is not needed for positioning, providing sufficient positioning space and preventing deformation during surface mount and reflow soldering. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A cross-sectional view of a positioning fixture for a PCB board for an LED display screen, provided according to an embodiment of the present invention, is shown.

[0020] Figure 2 It shows Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3An exploded view of a positioning fixture for a PCB board for an LED display screen provided according to an embodiment of the present invention is shown;

[0022] Figure 4 It shows Figure 3 A schematic diagram of the support base in the middle;

[0023] Figure 5 An assembly diagram of a positioning fixture for a PCB board for an LED display screen, provided according to an embodiment of the present invention, is shown.

[0024] The above figures include the following reference numerals:

[0025] 10. Base; 11. Receiving cavity; 12. Air extraction port; 13. First adsorption channel; 14. Seat body; 15. Cover body; 16. Second sealing ring;

[0026] 20. Support base; 21. Second adsorption channel; 211. Large diameter section; 212. Small diameter section; 22. Support surface; 23. Connecting section; 24. Support section;

[0027] 30. Magnetic components;

[0028] 40. First sealing ring;

[0029] 50. PCB board. Detailed Implementation

[0030] 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 some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 5As shown, this embodiment of the invention provides a positioning fixture for a PCB board of an LED display screen. The positioning fixture for the PCB board of an LED display screen includes a base 10 and a plurality of support seats 20. The base 10 has a receiving cavity 11 and an air extraction port 12 communicating with the receiving cavity 11. The top wall of the base 10 has a plurality of first adsorption channels 13 communicating with the receiving cavity 11 and spaced apart. The plurality of support seats 20 are all adjustablely positioned above the base 10. The bottom wall of each support seat 20 is in contact with the top wall of the base 10. Each support seat 20 has a second adsorption channel 21 penetrating its top wall and bottom wall and communicating with the first adsorption channel 13. Each second adsorption channel 21 is correspondingly arranged with a first adsorption channel 13 and communicating with the first adsorption channel 13. The top walls of the plurality of support seats 20 together form a support surface 22 for supporting the PCB board of the LED display screen.

[0032] According to the technical solution of this invention, the positioning fixture for the PCB board of an LED display screen includes a base 10 and multiple support seats 20. When using this positioning fixture for the PCB board of an LED display screen, the multiple support seats 20 are placed on the base 10, so that the bottom wall of the support seat 20 is in contact with the top wall of the base 10, and the second adsorption channel 21 of each support seat 20 is connected to the corresponding first adsorption channel 13 of the base 10. The back of the PCB board 50 is placed on the support surface 22, and the support seats 20 support the PCB board 50. An air pump is connected to the air extraction port 12 of the base 10, and air is extracted sequentially through the air extraction port 12, the receiving cavity 11, the first adsorption channel 13, and the second adsorption channel 21, so that the second adsorption channel 21 can generate negative pressure at the top wall of the support seat 20, thereby causing the PCB board 50 to adhere to the support surface 22 formed by the multiple support seats 20. Since the PCB board 50 is supported and positioned by simply adsorbing the back side of the PCB board 50, there is no need to use the front side of the PCB board 50 for positioning, so the PCB board 50 has sufficient positioning space and will not deform during the surface mount and reflow soldering processes.

[0033] The deformation of PCB board 50 refers to the bending of LED light board, especially for the bending of LED light board of large size and small pitch LED display. By using the positioning fixture provided in this embodiment, the positioning of PCB board 50 is more reasonable, so that PCB board will not bend during the chip mounting and reflow soldering process, and its flatness is better. This can prevent the splicing gap problem of LED display caused by PCB board deformation.

[0034] It should be noted that the PCB board in this embodiment is a PCB board used to manufacture the lamp board of an LED display screen. Of course, those skilled in the art can also use the positioning fixture provided in this embodiment to position and process PCB boards that are not limited to LED display screen lamp boards, according to actual conditions.

[0035] In this embodiment, in order to make the support base 20 support the PCB board 50 more stable, the top wall of the base 10, the bottom wall of the support base 20, the top wall of the support base 20, and the support surface 22 are all planar.

[0036] It should be noted that the number of second adsorption channels 21 is less than or equal to the number of first adsorption channels 13, so that the support base 20 can be arranged according to the actual situation of the PCB board. When the number of second adsorption channels 21 is less than the number of first adsorption channels 13, the second adsorption channels 21 that are connected to the outside need to be sealed to ensure airtightness.

[0037] like Figure 1 and Figure 3 As shown, the number of first adsorption channels 13 is greater than the number of support seats 20. Multiple support seats 20 are movably positioned above the base 10. The second adsorption channels 21 of the multiple support seats 20 are connected to a portion of the first adsorption channels 13, while the remaining first adsorption channels 13 are blocked. This configuration facilitates adjustment of the actual support position of the support seats 20 according to the size of the PCB board 50 and the actual position of its components, thus avoiding obstruction of the components on the PCB board 50. This allows for surface mount and reflow soldering operations on PCB boards of various models or sizes, enhancing the applicability of the positioning fixture.

[0038] It should be noted that when the number of first adsorption channels 13 is equal to the number of support seats 20, it is necessary to ensure that each support seat 20 can avoid the components on the PCB board 50 and can make contact with the back of the PCB board 50 so that the PCB board 50 can form a stable support effect.

[0039] In this embodiment, the positioning fixture for the PCB board of the LED display screen also includes sealing tape, and the remaining first adsorption channels 13 are sealed with sealing tape. The method of sealing the remaining first adsorption channels 13 with sealing tape has the advantage of being easy to operate.

[0040] In other embodiments, easily deformable sealing silicone pads or other sealing components can also be used to seal the remaining first adsorption channels 13, as long as the sealing of the receiving cavity of the base 10 can be achieved.

[0041] like Figure 3 and Figure 4As shown, the support base 20 includes a connecting section 23 and a support section 24 connected to each other. The cross-sectional dimension of the connecting section 23 is larger than that of the support section 24. The bottom wall of the connecting section 23 is in contact with the top wall of the base 10. The top walls of multiple support sections 24 together form a support surface 22. With the above structure, the support base 20 can increase the contact area between the support base 20 and the top wall of the base 10 by using the connecting section 23, thereby improving the support stability of the support base 20. The support section 24 can reduce the contact area between the top of the support base 20 and the PCB board 50, thereby allowing the support base 20 to avoid components on the PCB board 50 while ensuring support stability, so as to adapt to various PCB boards 50.

[0042] It should be noted that, to further enhance the support stability of the support base 20, the support section 24 includes a contact section and an intermediate section located below the contact section. The cross-sectional dimension of the contact section is smaller than that of the intermediate section, and the cross-sectional dimension of the intermediate section is smaller than that of the connecting section 23. This ensures that the support base 20 provides more stable support from top to bottom in the height direction. Furthermore, because the cross-sectional dimension of the contact section is smaller, it allows for space avoidance of components while ensuring support stability, thus meeting the space support requirements between different components.

[0043] In this embodiment, the outer surfaces of the connecting section 23, the contact section, and the middle section of the support base 20 are all rounded to prevent damage to the PCB board 50 caused by the sharp points on the outer surface of the support base 20 during the placement of the PCB board 50.

[0044] like Figure 1 and Figure 2 As shown, the second adsorption channel 21 includes a large-diameter section 211 and a small-diameter section 212 that are connected. The large-diameter section 211 is located below the small-diameter section 212, and the cross-sectional dimension of the large-diameter section 211 is larger than the cross-sectional dimension of the first adsorption channel 13. With the above-described structure, the second adsorption channel 21 can be easily aligned and connected with the first adsorption channel 13 using the large-diameter section 211, thereby enabling rapid positioning of the support base 20. Using the small-diameter section 212, the airflow speed can be increased under the same airflow rate, resulting in better adsorption between the PCB board 50 and the support base 20.

[0045] In this embodiment, the large-diameter section 211 is disposed within the connecting section 23, and the small-diameter section 212 is disposed within the supporting section 24, with the lower end of the small-diameter section 212 extending into the connecting section 23. Using the above structure, a suitable large-diameter section 211 and small-diameter section 212 can be disposed according to the cross-sectional dimensions of the support base 20.

[0046] like Figure 1 and Figure 2As shown, the positioning fixture for the PCB board of the LED display screen also includes a magnetic component 30 disposed on the support base 20, and the base 10 has a magnetic suction component that magnetically engages with the magnetic component 30. By using the magnetic component 30 and the magnetic suction component in a magnetic engagement manner, the connection between the support base 20 and the base 10 is ensured to be stable, while the support base 20 can be easily moved without disassembly, which has the advantages of convenience and speed.

[0047] In this embodiment, the magnetic component 30 is a magnet, and the magnetic attracting component is made of iron. Multiple magnetic components 30 are arranged circumferentially at intervals on the bottom wall of the support base 20.

[0048] like Figure 1 and Figure 2 As shown, the positioning fixture for the PCB board of the LED display screen also includes multiple first sealing rings 40 extending circumferentially along the support base 20. Each support base 20 has a first receiving groove on its bottom wall, and the first sealing rings 40 are located within the first receiving grooves. The two sides of the first sealing rings 40 are respectively abutted against the top wall of the base 10 and the bottom wall of the support base 20. The use of the first sealing rings 40 enhances the sealing between the support base 20 and the base 10, preventing air leakage, and thus allowing the PCB board 50 to be more stably attached to the support base 20.

[0049] In this embodiment, the first sealing ring 40 is located in the inner ring of the magnetic component 30, which ensures the stable connection between the support 20 and the base 10 while improving the sealing performance.

[0050] like Figure 3 As shown, the base 10 includes a base body 14 and a cover 15 covering the base body 14. A receiving cavity 11 is disposed on the base body 14, and an air extraction port 12 is disposed on the side wall of the base body 14. The bottom wall of the support 20 is fitted with the top wall of the cover 15, and the cover 15 is made of iron. The base 10 with the above structure has the advantages of simple structure and easy installation.

[0051] In this embodiment, the base 14 and the cover 15 are connected by bolts, which allows for easy disassembly. Meanwhile, to avoid obstructing the first adsorption channel 13 and the receiving cavity 11, the connecting bolts of the base 14 and the cover 15 are all located at the corners of the base 14.

[0052] Specifically, in order to facilitate the connection between the air extraction port 12 and the air extraction machine, an air inlet pipe is provided on the side wall of the base 14, and the air inlet pipe protrudes from the base 14.

[0053] like Figure 3As shown, the base 10 also includes a second sealing ring 16 extending circumferentially along the seat body 14. A second receiving groove is provided on the top wall of the seat body 14, and the second sealing ring 16 is located within the second receiving groove. The two sides of the second sealing ring 16 are respectively fitted against the bottom wall of the cover body 15 and the top wall of the seat body 14. The use of the second sealing ring 16 enhances the sealing between the seat body 14 and the cover body 15, preventing air leakage, and thus allowing the PCB board 50 to be more stably attached to the support base 20.

[0054] Another embodiment of the present invention provides a method for positioning a PCB board of an LED display screen. The method involves positioning the PCB board 50 using a positioning fixture for the PCB board of the LED display screen. The method includes:

[0055] S100. Determine the number of support bases 20 and the position of the support bases 20 on the base 10 according to the PCB board 50.

[0056] S200. According to the determined number of support seats 20 and the position of the support seats 20 on the base 10, multiple support seats 20 are set on the base 10;

[0057] S300, support the PCB board 50 on multiple support bases 20;

[0058] S400, air is drawn through the air extraction port 12, the receiving cavity 11, the first adsorption channel 13 on the base 10 and the second adsorption channel 21 of the support 20 to adsorb the PCB board 50.

[0059] The PCB board positioning method of this LED display screen is applied. The number of support seats 20 and the position of the support seats 20 on the base 10 are determined according to the PCB board 50 to avoid the components on the PCB board. Multiple support seats 20 are set on the base 10 so that the first adsorption channel 13 and the corresponding second adsorption channel 21 are connected. The PCB board 50 is then supported on the multiple support seats 20. By setting up an air pump, the air pump is used to sequentially draw air through the air extraction port 12 on the base 10, the receiving cavity 11, the first adsorption channel 13 and the second adsorption channel 21 of the support seat 20, so that the PCB board 50 can be stably adsorbed on the support seat 20.

[0060] When multiple support seats 20 are placed on the base 10, the first adsorption channel 13 and the corresponding second adsorption channel 21 can be connected. In addition, any excess first adsorption channels need to be sealed to ensure airtightness.

[0061] In this embodiment, step S100, which determines the number of support bases 20 and the position of the support bases 20 on the base 10 based on the PCB board 50, includes:

[0062] S110. Determine the number of support seats 20 and the position of the support seats 20 on the base 10 according to the size of the PCB board 50 and the position of the components on the back of the PCB board 50.

[0063] By using step S110, the actual support position of the support base 20 can be adjusted according to the size of the PCB board 50 and the actual position of the components on it, so as to adapt to multiple PCB boards 50 of different models or sizes, thereby enhancing the application range of the positioning fixture for PCB boards used in LED displays.

[0064] It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A positioning fixture for a PCB board of an LED display screen, characterized in that, The positioning fixture for the PCB board of the LED display screen includes: The base (10) has a receiving cavity (11), the base (10) has an air extraction port (12) connected to the receiving cavity (11), and the top wall of the base (10) has a plurality of first adsorption channels (13) connected to the receiving cavity (11) and spaced apart. Multiple support bases (20) are all positioned adjustablely above the base (10). The bottom wall of each support base (20) is in contact with the top wall of the base (10). Each support base (20) has a second adsorption channel (21) that penetrates its top and bottom walls and communicates with the first adsorption channel (13). Each second adsorption channel (21) is correspondingly provided with one of the first adsorption channels (13) and communicates with the first adsorption channel (13). The top walls of the multiple support bases (20) together form a support surface (22) for supporting the PCB board of the LED display screen. The number of the first adsorption channels (13) is greater than the number of the support seats (20). The multiple support seats (20) are movably arranged above the base (10). The second adsorption channels (21) of the multiple support seats (20) are connected to a portion of the first adsorption channels (13) in the multiple first adsorption channels (13). The remaining first adsorption channels (13) in the multiple first adsorption channels (13) are blocked. The support base (20) includes a connecting section (23) and a support section (24) connected to each other. The cross-sectional dimension of the connecting section (23) is larger than that of the support section (24). The bottom wall of the connecting section (23) is in contact with the top wall of the base (10). The top walls of multiple support sections (24) together form the support surface (22).

2. The positioning fixture for a PCB board of an LED display screen according to claim 1, characterized in that, The positioning fixture for the PCB board of the LED display screen also includes sealing tape, and the remaining first adsorption channels (13) are sealed by the sealing tape.

3. The positioning fixture for a PCB board of an LED display screen according to claim 1, characterized in that, The second adsorption channel (21) includes a large diameter section (211) and a small diameter section (212) that are connected to each other. The large diameter section (211) is located below the small diameter section (212), and the cross-sectional dimension of the large diameter section (211) is larger than the cross-sectional dimension of the first adsorption channel (13).

4. The positioning fixture for a PCB board of an LED display screen according to any one of claims 1 to 3, characterized in that, The positioning fixture for the PCB board of the LED display screen also includes a magnetic element (30) disposed on the support base (20), and the base (10) has a magnetic element that magnetically engages with the magnetic element (30).

5. The positioning fixture for a PCB board of an LED display screen according to any one of claims 1 to 3, characterized in that, The positioning fixture for the PCB board of the LED display screen also includes a plurality of first sealing rings (40) extending circumferentially along the support base (20). Each support base (20) has a first receiving groove on its bottom wall. The first sealing ring (40) is located in the first receiving groove. The two sides of the first sealing ring (40) are respectively attached to the top wall of the base (10) and the bottom wall of the support base (20).

6. The positioning fixture for a PCB board of an LED display screen according to any one of claims 1 to 3, characterized in that, The base (10) includes a seat (14) and a cover (15) covering the seat (14). The receiving cavity (11) is located on the seat (14). The air extraction port (12) is located on the side wall of the seat (14). The bottom wall of the support (20) is attached to the top wall of the cover (15). The cover (15) is made of iron.

7. The positioning fixture for a PCB board of an LED display screen according to claim 6, characterized in that, The base (10) further includes a second sealing ring (16) extending circumferentially along the seat body (14). The top wall of the seat body (14) is provided with a second receiving groove. The second sealing ring (16) is located in the second receiving groove. The two sides of the second sealing ring (16) are respectively attached to the bottom wall of the cover body (15) and the top wall of the seat body (14).

8. A method for positioning a PCB board for an LED display screen, characterized in that, The PCB board (50) is positioned using a positioning fixture for the PCB board of the LED display screen, wherein the positioning fixture for the PCB board of the LED display screen is the positioning fixture for the PCB board of the LED display screen as described in any one of claims 1-7, and the positioning method for the PCB board of the LED display screen includes: The number of support bases (20) and the position of the support bases (20) on the base (10) are determined according to the PCB board (50); According to the determined number of the support bases (20) and the position of the support bases (20) on the base (10), a plurality of the support bases (20) are arranged on the base (10); The PCB board (50) is supported on a plurality of the support bases (20); The PCB board (50) is adsorbed by drawing air through the air extraction port (12), the receiving cavity (11), the first adsorption channel (13) on the base (10) and the second adsorption channel (21) of the support (20).

9. The method for positioning the PCB board of an LED display screen according to claim 8, characterized in that, The steps for determining the number of support bases (20) and the position of the support bases (20) on the base (10) based on the PCB board (50) include: The number of support bases (20) and the position of the support bases (20) on the base (10) are determined according to the size of the PCB board (50) and the position of the components on the back of the PCB board (50).

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