Welding jig

Abstract

The utility model provides a welding jig. The welding jig comprises a limiting structure arranged on the supporting assembly, the limiting structure is provided with a first limiting concave part and a second limiting concave part, and the first limiting concave part is used for containing a substrate so that the substrate can be positioned through a limiting stopper between the inner wall of the first limiting concave part and the substrate; the pressing assembly is used for pressing the to-be-welded part on the base plate, at least part of the pressing assembly is located in the second limiting concave part, and the pressing assembly comprises a pressing structure used for abutting against the to-be-welded part; wherein at least part of the pressing structure is made of a flexible material, in the pressing process of the pressing assembly, the part, abutting against the to-be-welded part, of the pressing structure deforms to form a third limiting concave part used for containing the to-be-welded part, and a limiting stop is arranged between at least part of the inner wall of the third limiting concave part and the to-be-welded part; and the to-be-welded part is positioned. According to the utility model, the problem that the Mini LED chip deviates or inclines in the welding process in the prior art is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of display chip processing technology, and more specifically, to a welding fixture. Background Technology

[0002] Currently, Mini LEDs (submillimeter-sized light-emitting diodes) are widely used in screens. Compared with conventional-sized LED chips, Mini LEDs have higher installation precision requirements in order to ensure the color consistency of the screen from various viewing angles. This means that all Mini LED chips need to be horizontally soldered onto the pads as much as possible, so that the light-emitting surface of the Mini LED chip and the substrate are both horizontally set, thereby ensuring the color consistency of the screen.

[0003] In existing technologies, manufacturers typically apply solder paste to pads, then mount the Mini LED chip onto the solder paste, and finally solder the Mini LED chip onto the substrate using reflow soldering.

[0004] However, during the reflow soldering process, the Mini LED chip will flow with the solder paste, which becomes liquid after being heated, causing the Mini LED chip to shift or tilt. As a result, the light-emitting surface of the Mini LED chip and the substrate are no longer parallel to each other, and the color uniformity of the screen is severely reduced. Utility Model Content

[0005] The main purpose of this invention is to provide a welding fixture to solve the problem of Mini LED chips shifting or tilting during the welding process in the prior art.

[0006] To achieve the above objectives, this utility model provides a welding fixture for positioning the workpiece and substrate during the welding process. The welding fixture includes: a support assembly; a limiting structure disposed on the support assembly, the limiting structure having a first limiting recess and a second limiting recess, the first limiting recess being disposed close to the support assembly relative to the second limiting recess, the first limiting recess being used to accommodate the substrate, thereby positioning the substrate by a limiting stop between its inner wall and the substrate; and a clamping assembly for pressing the workpiece onto the substrate, at least a portion of the clamping assembly being located within the second limiting recess, the clamping assembly including a clamping structure for abutting against the workpiece; wherein at least a portion of the clamping structure is made of a flexible material, and during the clamping process of the clamping assembly, the portion of the clamping structure abutting against the workpiece deforms to form a third limiting recess for accommodating the workpiece, the limiting stop between at least a portion of the inner wall of the third limiting recess and the workpiece being welded, thereby positioning the workpiece.

[0007] Furthermore, the clamping assembly also includes: a clamping body, at least a portion of which is located within the second limiting recess, and a clamping structure disposed on the clamping body; wherein at least a portion of the inner wall of the second limiting recess provides a limiting stop with the clamping body, thereby positioning the clamping body.

[0008] Furthermore, the clamping structure has a clamping surface for abutting against the workpiece to be welded, the projection of the workpiece to be welded on the clamping surface being located within the clamping surface; and / or, the clamping body has a mounting surface for mounting the clamping structure, the projection of the clamping structure on the mounting surface being located within the mounting surface.

[0009] Furthermore, the limiting structure includes a plurality of limiting members disposed around the substrate, each limiting member having: a second sub-limiting recess, the bottom wall of the second sub-limiting recess being used to support the pressing assembly, and at least a portion of the inner sidewall of the second sub-limiting recess being used to limit and stop with the pressing assembly; wherein, the second sub-limiting recess extends to at least a portion of the outer peripheral surface of the limiting member to form a second opening, and the second sub-limiting recesses of each limiting member are interconnected through the second openings of each second sub-limiting recess to surround and form the second limiting recess.

[0010] Furthermore, each limiting member also has: a first sub-limiting recess disposed on the bottom wall of the second sub-limiting recess, the bottom wall of the first sub-limiting recess being used to support the substrate, and at least a portion of the inner sidewall of the first sub-limiting recess being used to limit and stop the substrate; wherein, the first sub-limiting recess extends to at least a portion of the outer peripheral surface of the limiting member to form a first opening, and the first sub-limiting recesses of each limiting member are interconnected through the first openings of each first sub-limiting recess to surround and form the first limiting recess.

[0011] Furthermore, in a limiting member, there is a preset distance L between the bottom wall of the first sub-limiting recess and the bottom wall of the second sub-limiting recess, and there is a total height H between the substrate and the workpiece to be welded. The preset distance L and the total height H satisfy the following condition: (HL) ≥ 0.2 mm.

[0012] Furthermore, the welding fixture also includes: a support member disposed on the support assembly and located below the substrate, the support member including an abutment portion for abutting against the substrate to support the substrate; wherein the abutment portion is telescopically disposed to apply a pushing force to the substrate toward the side away from the support assembly.

[0013] Furthermore, the abutment portion is rod-shaped, and the support member also includes: a cylindrical body disposed on the support assembly, one end of the abutment portion being telescopically disposed in the inner hole of the cylindrical body; and an elastic member disposed in the inner hole, one end of the elastic member being connected to the cylindrical body, and the other end of the elastic member being connected to the abutment portion.

[0014] Further, the support assembly includes: a plate-shaped carrier, with a limiting structure disposed on the plate surface of the plate-shaped carrier; and a support leg disposed on the plate surface of the plate-shaped carrier away from the limiting structure for supporting the plate-shaped carrier; the plate-shaped carrier has multiple cutouts located below the substrate, the multiple cutouts being spaced apart along the length and / or width direction of the plate-shaped carrier, and a plate-shaped support between two adjacent cutouts forming a mounting portion; wherein, there are multiple support members, and when the substrate is less than or equal to a preset size, the multiple support members are disposed around the multiple cutouts; when the substrate is larger than the preset size, at least a portion of the support members are disposed around the multiple cutouts; and at least another portion of the support members are disposed on the mounting portion.

[0015] Furthermore, the clamping structure is plate-shaped and includes an interconnected connecting layer and a clamping layer. The clamping layer is used to abut against the workpiece to be welded. The connecting layer is located between the clamping layer and the clamping body to connect the clamping layer and the clamping body. The clamping layer is made of a flexible material. The thickness T1 of the connecting layer satisfies: 180um≤T1≤220umm, and the thickness T2 of the clamping layer satisfies: 100um≤T2. And / or, the clamping assembly has a transparent portion disposed opposite to the substrate and / or the workpiece to be welded.

[0016] According to the technical solution of this utility model, a welding fixture is used to position the workpiece and the substrate during the welding process. The limiting structure of the welding fixture is disposed on a support assembly. The limiting structure has a first limiting recess and a second limiting recess. The first limiting recess is disposed closer to the support assembly than the second limiting recess. The first limiting recess is used to accommodate the substrate, thereby positioning the substrate by a limiting stop between its inner wall and the substrate. A clamping assembly is used to press the workpiece onto the substrate. At least a portion of the clamping assembly is located within the second limiting recess. The clamping assembly includes a clamping structure for abutting against the workpiece. At least a portion of the clamping structure is made of a flexible material. During the clamping process, the portion of the clamping structure that abuts against the workpiece deforms to form a third limiting recess for accommodating the workpiece. At least a portion of the inner wall of the third limiting recess provides a limiting stop between it and the workpiece, thereby positioning the workpiece. In this way, after the operator places the substrate in the first limiting recess to position it, the clamping assembly is then operated to press the component to be welded onto the substrate. During the clamping process, the part of the clamping structure made of flexible material that abuts against the component to be welded will deform and generate a third limiting recess that can accommodate the component to be welded, thereby positioning the component to be welded. Compared with the traditional method of positioning by clamping friction, the third limiting recess in this application can effectively position the tiny component to be welded (Mini LED chip) (no longer limited by insufficient clamping friction due to small contact area), thereby avoiding the phenomenon of shaking or shifting between the component to be welded and the substrate during the welding process, ensuring a sufficiently high welding quality between the component to be welded and the substrate, and thus solving the problem of Mini LED chip shifting or tilting during the welding process in the prior art, improving the color consistency of the screen. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A partial structural front view of an embodiment of the welding fixture according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 A magnified view of a portion of the image;

[0020] Figure 3 It shows Figure 1 A top view of the welding fixture in the image;

[0021] Figure 4 It shows Figure 1 A bottom view of the welding fixture in the image;

[0022] Figure 5 It shows Figure 1 Side view of the welding fixture in the image;

[0023] Figure 6 It shows Figure 1 A partial structural diagram of the welding fixture in the diagram;

[0024] Figure 7 It shows Figure 6 A magnified view of a portion of the image;

[0025] Figure 8 This diagram illustrates the overall structure of a Mini LED chip soldered onto a substrate in the prior art.

[0026] The above figures include the following reference numerals:

[0027] 1. Component to be soldered; 2. Substrate; 3. Solder pads; 4. Solder paste;

[0028] 10. Support component; 11. Plate-shaped load-bearing component; 111. Hollowed-out section; 112. Mounting section; 113. Mounting hole; 12. Support leg;

[0029] 20. Limiting structure; 21. First limiting recess; 22. Second limiting recess; 23. Limiting member; 231. Second sub-limiting recess; 232. Second opening; 233. First sub-limiting recess; 234. First opening;

[0030] 30. Clamping assembly; 31. Clamping structure; 311. Clamping surface; 32. Clamping body; 321. Mounting surface;

[0031] 40. Support component; 41. Abutment part; 42. Cylindrical main body. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0035] To address the problem of Mini LED chips shifting or tilting during the welding process in existing technologies, this application provides a welding fixture.

[0036] like Figures 1 to 7 As shown, the welding fixture is used to position the workpiece 1 and the substrate 2 during the welding process between them. The welding fixture includes: a support assembly 10; a limiting structure 20 disposed on the support assembly 10, the limiting structure 20 having a first limiting recess 21 and a second limiting recess 22, the first limiting recess 21 being disposed close to the support assembly 10 relative to the second limiting recess 22, the first limiting recess 21 being used to accommodate the substrate 2, and the substrate 2 being positioned by a limiting stop between its inner wall and the substrate 2; and a pressing assembly 30 for pressing the workpiece 1 onto the substrate 2, at least part of the pressing assembly 30 being located within the second limiting recess 22, the pressing assembly 30 including a pressing structure 31 for abutting against the workpiece 1. At least a portion of the clamping structure 31 is made of a flexible material. During the clamping process of the clamping assembly 30, the portion of the clamping structure 31 that abuts against the workpiece 1 to be welded deforms to form a third limiting recess for accommodating the workpiece 1 to be welded. At least a portion of the inner wall of the third limiting recess is limited and stopped between the workpiece 1 to be welded to position the workpiece 1 to be welded.

[0037] Using the technical solution of this embodiment, the welding fixture is used to position the workpiece 1 and the substrate 2 during the welding process between them. The limiting structure 20 of the welding fixture is disposed on the support component 10. The limiting structure 20 has a first limiting recess 21 and a second limiting recess 22. The first limiting recess 21 is disposed close to the support component 10 relative to the second limiting recess 22. The first limiting recess 21 is used to accommodate the substrate 2 so as to position the substrate 2 by limiting the stop between its inner wall and the substrate 2. The pressing component 30 is used to press the workpiece 1 onto the substrate 2. At least part of the pressing component 30 is located in the second limiting recess 22. The pressing component 30 includes a pressing structure 31 for abutting against the workpiece 1. At least a portion of the clamping structure 31 is made of a flexible material. During the clamping process of the clamping assembly 30, the portion of the clamping structure 31 that abuts against the workpiece 1 to be welded deforms to form a third limiting recess for accommodating the workpiece 1 to be welded. At least a portion of the inner wall of the third limiting recess is limited and stopped between the workpiece 1 to be welded to position the workpiece 1 to be welded. In this way, after the operator places the substrate 2 into the first limiting recess 21 to position the substrate 2, the clamping component 30 is then operated to press the workpiece 1 to be welded onto the substrate 2. During the clamping process of the clamping component 30, the part of the clamping structure 31 made of flexible material that abuts against the workpiece 1 will deform and generate a third limiting recess that can accommodate the workpiece 1, thereby positioning the workpiece 1. Compared with the traditional method of positioning by clamping friction, the third limiting recess in this embodiment can effectively position the tiny workpiece 1 (Mini LED chip) (no longer limited by insufficient clamping friction due to small contact area), thereby avoiding the phenomenon of shaking or shifting between the workpiece 1 and the substrate 2 during the welding process, ensuring a sufficiently high welding quality between the workpiece 1 and the substrate 2, and thus solving the problem of Mini LED chip shifting or tilting during the welding process in the prior art, improving the color consistency of the screen.

[0038] Specifically, the welding fixture in this embodiment can effectively position Mini LEDs (with dimensions ranging from 100µm to 300µm) and can also effectively position LED chips of conventional sizes.

[0039] Specifically, the substrate 2 is also provided with solder pads 3 for soldering. Solder paste 4 is applied to the solder pads 3. The component 1 to be soldered is placed on the solder paste 4. The solder paste 4 is melted by reflow soldering, thereby soldering the substrate 2 and the component 1 to be soldered.

[0040] like Figure 8 As shown, this is a side view of a partial structure of a Mini LED chip after welding in the prior art, which shows a relatively obvious problem of Mini LED chip flipping and tilting.

[0041] like Figure 7 The image shows a partial side view of the structure after the Mini LED chip and substrate 2 are positioned and welded using the welding fixture in this embodiment. The Mini LED chip is completely horizontal, and the screen has extremely high color uniformity.

[0042] like Figures 1 to 7 As shown, the clamping assembly 30 further includes a clamping body 32, at least a portion of which is located within the second limiting recess 22, and a clamping structure 31 disposed on the clamping body 32. At least a portion of the inner wall of the second limiting recess 22 provides a limiting stop with the clamping body 32, thus positioning the clamping body 32. This arrangement allows the second limiting recess 22 to also limit and position the clamping assembly 30 (clamping body 32), preventing the clamping assembly 30 from shaking or tilting, thereby improving the positioning reliability of the clamping assembly 30 on the workpiece 1 to be welded.

[0043] Specifically, the clamping component 30 in this embodiment adopts a manual clamping method, that is, it is necessary for the staff to manually clamp the clamping component 30 to achieve the clamping action. By using the second limiting recess 22 to limit and stop the clamping body 32, the difficulty of manual operation by the staff can be effectively reduced and the positioning reliability of the clamping component 30 can be improved.

[0044] In other embodiments not shown in the accompanying drawings, an additional drive structure may be provided to drive the clamping assembly to move up and down, so as to realize the clamping action of the clamping assembly.

[0045] Optionally, the clamping structure 31 has a clamping surface 311 for abutting against the workpiece 1 to be welded, the projection of the workpiece 1 on the clamping surface 311 being located within the clamping surface 311; and / or, the clamping body 32 has a mounting surface 321 for mounting the clamping structure 31, the projection of the clamping structure 31 on the mounting surface 321 being located within the mounting surface 321. In this way, the above arrangement ensures, on the one hand, that the clamping structure 31 can simultaneously clamp multiple workpieces 1 to be welded, thereby ensuring high positioning consistency among the multiple workpieces 1 to be welded, and further ensuring high synchronization of the welding quality among the multiple workpieces 1 to be welded, further improving the color consistency of the screen; on the other hand, the arrangement between the mounting surface 321 and the clamping structure 31 ensures that the clamping body 32 can stably and effectively support the clamping structure 31 made of flexible material.

[0046] In this embodiment, both the pressing structure 31 and the pressing body 32 are rectangular plate structures with the same dimensions. The second limiting recess 22 matches the structure of the pressing body 32. The inner sidewall of the second limiting recess 22 is limited and stopped with the outer peripheral surface of the pressing body 32 to position the pressing body 32.

[0047] In this embodiment, the substrate 2 is a rectangular plate structure. The first limiting recess 21 matches the structure of the substrate 2. The inner sidewall of the first limiting recess 21 and the outer peripheral surface of the substrate 2 provide a limiting stop to position the substrate 2.

[0048] In this embodiment, the dimensions (length and width) of the pressing body 32 and the pressing structure 31 are larger than the dimensions (length and width) of the substrate 2, so as to ensure that the pressing structure 31 can simultaneously press multiple parts 1 to be welded on the substrate 2.

[0049] like Figures 1 to 3 and Figure 5 As shown, the limiting structure 20 includes a plurality of limiting members 23 arranged around the substrate 2. Each limiting member 23 has a second sub-limiting recess 231. The bottom wall of the second sub-limiting recess 231 is used to support the clamping assembly 30, and at least a portion of the inner sidewall of the second sub-limiting recess 231 is used to limit and stop with the clamping assembly 30. The second sub-limiting recess 231 extends to at least a portion of the outer peripheral surface of the limiting member 23 to form a second opening 232. The second sub-limiting recesses 231 of each limiting member 23 are interconnected through the second openings 232 of each second sub-limiting recess 231 to form a second limiting recess 22. This arrangement reduces the overall size and weight of the limiting structure 20 (i.e., it only includes a plurality of limiting members 23 with reduced volume and weight), thereby achieving a lightweight design of the welding fixture and reducing the difficulty for workers to transport the welding fixture. On the other hand, it makes the formation of the second limiting recess 22 simpler, easier to process and realize, and also reduces the processing cost of the limiting member 23.

[0050] In this embodiment, the limiting member 23 is a cuboid structure, and the second sub-limiting recess 231 is a rectangular recess provided on its upper surface. The second sub-limiting recess 231 extends to two adjacent outer surfaces of the cuboid limiting member 23 to form a second opening 232. This arrangement allows the structure of the second sub-limiting recess 231 to match the structure of the pressing body 32, ensuring reliable limiting and stopping between its inner sidewall and the outer peripheral surface of the pressing body 32.

[0051] like Figures 1 to 3 and Figure 5As shown, each limiting member 23 also has a first sub-limiting recess 233 disposed on the bottom wall of the second sub-limiting recess 231. The bottom wall of the first sub-limiting recess 233 is used to support the substrate 2, and at least a portion of the inner sidewall of the first sub-limiting recess 233 is used to limit and stop the substrate 2. The first sub-limiting recess 233 extends to at least a portion of the outer peripheral surface of the limiting member 23 to form a first opening 234. The first sub-limiting recesses 233 of each limiting member 23 are interconnected through the first openings 234 of each first sub-limiting recess 233 to surround and form the first limiting recess 21. In this way, the first sub-limiting recess 233 is actually located below the second sub-limiting recess 231, that is, it ensures that the pressing body 32 can be located above the substrate 2 to drive the pressing structure 31 disposed thereon to perform a pressing action. At the same time, the above arrangement also makes the formation of the first limiting recess 21 simpler, easier to process and implement, and reduces the processing cost of the limiting member 23.

[0052] In this embodiment, the first sub-limiting recess 233 is also a rectangular recess to ensure that the structure of the first sub-limiting recess 233 can match the structure of the substrate 2, thereby reliably limiting and positioning the substrate 2. It extends to the same side as the limiting member 23 to which the second sub-limiting recess 231 extends, to form the first opening 234.

[0053] In this embodiment, there are four limiting members 23, which are located at the four apex corners of the rectangular plate-shaped substrate 2, so as to form a first limiting recess 21 by the four first sub-limiting recesses 233 of the four limiting members 23, and to form a second limiting recess 22 by the four second sub-limiting recesses 231 of the four limiting members 23.

[0054] It should be noted that the number of limiting members 23 is not limited to this and can be adjusted according to working conditions and usage requirements, as long as multiple limiting members 23 can effectively position the substrate 2 and the pressing body 32.

[0055] Optionally, in one limiting member 23, there is a preset distance L between the bottom wall of the first sub-limiting recess 233 and the bottom wall of the second sub-limiting recess 231, and a total height H between the substrate 2 and the workpiece 1 to be welded, wherein the preset distance L and the total height H satisfy (HL) ≥ 0.2 mm. This arrangement ensures that the installed workpiece 1 to be welded is slightly higher than the bottom wall of the second sub-limiting recess 231, guaranteeing that the clamping structure 31 can stably form a sufficiently large portion during the pressing process of the clamping assembly 30, thus forming a third limiting recess with sufficiently high positioning reliability. Simultaneously, this arrangement also allows for more flexible and diverse dimensional settings to adapt to different working conditions and usage requirements, and improves the processing flexibility of the operator.

[0056] In this embodiment, the preset distance L and the total height H satisfy the following condition: HL = 0.2 mm.

[0057] Specifically, there is a height difference of 0.2mm between the upper surface of the workpiece 1 to be welded and the bottom wall of the second sub-limiting recess 231. That is, after the pressing assembly 30 is pressed down into place, the pressing structure 31 can form a third limiting recess with a maximum depth of 0.2mm, thereby effectively limiting and positioning the workpiece 1 to be welded.

[0058] like Figure 1 , Figure 3 and Figure 5 As shown, the welding fixture also includes a support member 40, disposed on the support assembly 10 and located below the substrate 2. The support member 40 includes an abutment portion 41, which abuts against the substrate 2 to support it. The abutment portion 41 is telescopically configured to apply a pushing force to the substrate 2 in a direction away from the support assembly 10. In this way, by supporting the substrate 2 with the support member 40, it is possible to prevent excessive deformation of the support member 40, which could affect the welding quality of the workpiece 1 to be welded, or even damage or breakage of the substrate 2. Furthermore, the telescopically configured abutment portion 41 can provide a certain amount of deformation to the substrate 2 when the instantaneous pressure of the clamping assembly 30 is too high, thus preventing a hard collision between the clamping assembly 30 and the workpiece 1 to be welded, which could damage the workpiece 1. This allows the welding fixture to provide some protection for the substrate 2 and the workpiece 1 to be welded, reducing the defect rate.

[0059] like Figure 1 , Figure 3 and Figure 5 As shown, the abutment portion 41 is rod-shaped, and the support member 40 further includes: a cylindrical body 42, disposed on the support assembly 10, with one end of the abutment portion 41 retractably disposed in the inner hole of the cylindrical body 42; and an elastic member, disposed in the inner hole, with one end of the elastic member connected to the cylindrical body 42 and the other end of the elastic member connected to the abutment portion 41. This arrangement simplifies the structure of the support member 40, making it easier to manufacture and reducing its manufacturing cost. Furthermore, the elastic member ensures that the pushing force provided by the abutment portion 41 matches the deformation degree of the substrate 2 (i.e., the greater the deformation of the substrate 2, the greater the elastic force provided by the elastic member, and the greater the pushing force), achieving spontaneous adaptation of the pushing force and further preventing the substrate 2 from breaking or being damaged due to excessive deformation.

[0060] In this embodiment, the elastic element is a spring.

[0061] like Figures 1 to 7As shown, the support assembly 10 includes: a plate-shaped support member 11, with a limiting structure 20 disposed on the plate surface of the plate-shaped support member 11; and a support leg 12 disposed on the plate surface of the plate-shaped support member 11 away from the limiting structure 20 for supporting the plate-shaped support member 11; the plate-shaped support member 11 is provided with a plurality of hollow portions 111 located below the substrate 2, the plurality of hollow portions 111 being spaced apart along the length direction and / or width direction of the plate-shaped support member 11, and a plate-shaped support member 40 between two adjacent hollow portions 111 forming a mounting portion 112; wherein, there are a plurality of support members 40, when the substrate 2 is less than or equal to a preset size, the plurality of support members 40 are disposed around the plurality of hollow portions 111; when the substrate 2 is greater than the preset size, at least a portion of the support members 40 are disposed around the plurality of hollow portions 111; and at least another portion of the support members 40 are disposed on the mounting portion 112. In this way, the above-mentioned configuration achieves a lightweight design for the plate-shaped support member 11 through the hollowed-out portion 111, thereby reducing the overall weight of the welding fixture and lowering the difficulty of transportation for workers. On the other hand, the arrangement of the support legs 12 allows space to be formed below the plate-shaped support member 11, enabling the devices and circuits used in the welding process to connect with the substrate 2 through the space below the plate-shaped support member 11 and the hollowed-out portion 111, thus ensuring the smooth progress of the welding process. At the same time, the number and position of the support members 40 make its support range more flexible and diverse, matching the actual size of the substrate 2, thereby avoiding the rigidity of the middle area of ​​the substrate 2 being too small, which would cause the middle area to be prone to deformation (i.e., the support members 40 located on the mounting portion 112 can provide further support to this area).

[0062] In this embodiment, the preset size is the length and width of the substrate 2, which is 200mm*200mm.

[0063] In this embodiment, the size of the substrate 2 is larger than the preset size, so a plurality of support members 40 are also provided on the mounting part 112 to support the middle area of ​​the substrate 2.

[0064] In this embodiment, the plate-shaped support member 11 is also provided with mounting holes 113 for mounting the support leg 12.

[0065] Optionally, the clamping structure 31 is plate-shaped and includes an interconnected connecting layer and a clamping layer. The clamping layer abuts against the workpiece 1 to be soldered, and the connecting layer is located between the clamping layer and the clamping body 32 to connect the clamping layer and the clamping body 32. The clamping layer is made of a flexible material. The thickness T1 of the connecting layer satisfies: 180µm ≤ T1 ≤ 220µm, and the thickness T2 of the clamping layer satisfies: 100µm ≤ T2. And / or, the clamping assembly 30 has a transparent portion disposed opposite to the substrate 2 and / or the workpiece 1 to be soldered. In this way, the above-mentioned arrangement allows the clamping layer, made of flexible material, to be connected to the clamping body 32 via the connecting layer. Furthermore, the thickness settings of the connecting layer and the clamping layer not only ensure a reliable connection of the connecting layer but also ensure that the clamping layer can undergo sufficient deformation to create a sufficiently deep third limiting recess. Simultaneously, the transparent portion allows the operator to visually observe the melting state of the solder paste at the soldering position to determine whether the soldering has been successful.

[0066] In this embodiment, the thickness T1 of the connecting layer is 200 μm, and it is made entirely of heat-resistant and heat-insulating materials to prevent temperature rise of the pressing body 32 due to heat conduction, which could burn workers. At the same time, the thickness T1 in this embodiment also helps ensure reliable heat insulation.

[0067] In this embodiment, the thickness T2 of the clamping layer is 100um, that is, during the pressing process of the clamping component 30, the clamping layer can generate a third limiting recess with a depth of 100um to accommodate the workpiece 1 to be welded and to position the workpiece 1 to be welded.

[0068] Specifically, the overall dimensions (length and width) of the clamping layer are actually larger than the dimensions (length and width) of the substrate 2. During the pressing process of the clamping assembly 30, after the clamping layer on the bottom wall of the second sub-limiting recess 231 and the part of the clamping layer that abuts against the workpiece 1 are deformed, the remaining part of the clamping layer will not be deformed. Instead, it will move to abut against the surface of the substrate 2 where the workpiece 1 is not provided. This part of the clamping layer can press down on the substrate 2 to prevent the substrate 2 from deforming, thereby reducing the "warping edge" problem of the substrate 2, ensuring that the substrate 2 is completely horizontal, further improving the welding quality between the substrate 2 and the workpiece 1, and improving the color consistency of the screen.

[0069] It should be noted that this embodiment does not limit the specific material of the pressing layer, but requires that it be heat-resistant, does not dissolve or leave residue at high temperatures below 300°C, and has no high stickiness, so as to avoid it remaining on or adhering to the workpiece 1 to be welded during the high-temperature welding process.

[0070] In this embodiment, the pressing body 32 is a glass plate, which is transparent as a whole. The pressing layer and the connecting layer are also transparent. That is, the pressing component 30 is transparent as a whole, so that the staff can observe it intuitively.

[0071] This embodiment also provides a method for using the welding fixture, the specific method of use is as follows:

[0072] Step S1: Place the substrate 2, with the component to be soldered 1, solder pad 3 and solder paste 4 installed, into the first limiting recess 21 on the corresponding model of special fixture (soldering fixture), with the component to be soldered 1 facing upwards.

[0073] Step S2: Gently place the clamping assembly 30 into the second limiting recess 22, with the side having the clamping structure 31 facing down, i.e., opposite to the part 1 to be welded;

[0074] Step S3: Manual pressing. After pressing, the entire welding fixture is placed into the reflow soldering machine for welding.

[0075] Step S4: After welding is completed, remove the welding fixture and wait for it to cool down to room temperature before removing the clamping component 30.

[0076] Step S5: After removing the clamping assembly 30, peel off the clamping layer and connecting layer from the clamping body 32, and use a flux cleaner to clean the residual flux on the clamping body 32. After cleaning, the connecting layer and clamping layer can be reapplied to achieve the reuse of the clamping assembly 30.

[0077] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0078] A welding fixture is used to position the workpiece and substrate during the welding process. A limiting structure of the welding fixture is disposed on a support assembly. The limiting structure has a first limiting recess and a second limiting recess. The first limiting recess is disposed close to the support assembly relative to the second limiting recess. The first limiting recess is used to accommodate the substrate, thereby positioning the substrate by a limiting stop between its inner wall and the substrate. A clamping assembly is used to press the workpiece onto the substrate. At least a portion of the clamping assembly is located within the second limiting recess. The clamping assembly includes a clamping structure for abutting against the workpiece. At least a portion of the clamping structure is made of a flexible material. During the clamping process, the portion of the clamping structure abutting against the workpiece deforms to form a third limiting recess for accommodating the workpiece. At least a portion of the inner wall of the third limiting recess provides a limiting stop between it and the workpiece, thereby positioning the workpiece. In this way, after the operator places the substrate in the first limiting recess to position it, the clamping assembly is then operated to press the component to be welded onto the substrate. During the clamping process, the part of the clamping structure made of flexible material that abuts against the component to be welded will deform and generate a third limiting recess that can accommodate the component to be welded, thereby positioning the component to be welded. Compared with the traditional method of positioning by clamping friction, the third limiting recess in this application can effectively position the tiny component to be welded (Mini LED chip) (no longer limited by insufficient clamping friction due to small contact area), thereby avoiding the phenomenon of shaking or shifting between the component to be welded and the substrate during the welding process, ensuring a sufficiently high welding quality between the component to be welded and the substrate, and thus solving the problem of Mini LED chip shifting or tilting during the welding process in the prior art, improving the color consistency of the screen.

[0079] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0080] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0081] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A welding fixture for positioning the workpiece (1) and the substrate (2) during welding, characterized in that, The welding fixture includes: Support component (10); A limiting structure (20) is provided on the support assembly (10). The limiting structure (20) has a first limiting recess (21) and a second limiting recess (22). The first limiting recess (21) is disposed close to the support assembly (10) relative to the second limiting recess (22). The first limiting recess (21) is used to accommodate the substrate (2) so as to position the substrate (2) by limiting the stop between its inner wall and the substrate (2). A clamping assembly (30) is used to clamp the workpiece (1) to be welded onto the substrate (2). At least a portion of the clamping assembly (30) is located within the second limiting recess (22). The clamping assembly (30) includes a clamping structure (31) for abutting against the workpiece (1). At least a portion of the clamping structure (31) is made of a flexible material. During the clamping process of the clamping assembly (30), the portion of the clamping structure (31) that abuts against the workpiece (1) deforms to form a third limiting recess for accommodating the workpiece (1). At least a portion of the inner wall of the third limiting recess is limited and stopped between the workpiece (1) and the workpiece (1) to position the workpiece (1).

2. The welding fixture according to claim 1, characterized in that, The clamping assembly (30) also includes: A pressing body (32), at least a portion of which is located within the second limiting recess (22), and a pressing structure (31) disposed on the pressing body (32); Wherein, at least a portion of the inner wall of the second limiting recess (22) is limited and stopped between the pressing body (32) and the pressing body (32) for positioning.

3. The welding fixture according to claim 2, characterized in that, The clamping structure (31) has a clamping surface (311) for abutting against the workpiece (1) to be welded, the projection of the workpiece (1) on the clamping surface (311) being located within the clamping surface (311); and / or, The clamping body (32) has a mounting surface (321) for mounting the clamping structure (31), and the projection of the clamping structure (31) on the mounting surface (321) is located within the mounting surface (321).

4. The welding fixture according to any one of claims 1 to 3, characterized in that, The limiting structure (20) includes a plurality of limiting members (23) disposed around the substrate (2), each of the limiting members (23) having: The second sub-limiting recess (231) has a bottom wall for supporting the clamping assembly (30) and at least a portion of the inner sidewall of the second sub-limiting recess (231) is used for limiting and stopping the clamping assembly (30). The second sub-limiting recess (231) extends to at least a portion of the outer peripheral surface of the limiting member (23) to form a second opening (232), and the second sub-limiting recesses (231) of each limiting member (23) are interconnected through the second openings (232) of each second sub-limiting recess (231) to surround the formation of the second limiting recess (22).

5. The welding fixture according to claim 4, characterized in that, Each of the aforementioned limiting members (23) further comprises: A first sub-limiting recess (233) is disposed on the bottom wall of the second sub-limiting recess (231). The bottom wall of the first sub-limiting recess (233) is used to support the substrate (2). At least a portion of the inner sidewall of the first sub-limiting recess (233) is used to limit and stop the substrate (2). The first sub-limiting recess (233) extends to at least a portion of the outer peripheral surface of the limiting member (23) to form a first opening (234), and the first sub-limiting recesses (233) of each limiting member (23) are interconnected through the first openings (234) of each first sub-limiting recess (233) to surround the formation of the first limiting recess (21).

6. The welding fixture according to claim 5, characterized in that, In one of the limiting members (23), there is a preset distance L between the bottom wall of the first sub-limiting recess (233) and the bottom wall of the second sub-limiting recess (231), and there is a total height H between the substrate (2) and the workpiece to be welded (1). The preset distance L and the total height H satisfy: (HL) ≥ 0.2 mm.

7. The welding fixture according to claim 1, characterized in that, The welding fixture also includes: A support member (40) is disposed on the support assembly (10) and located below the substrate (2). The support member (40) includes an abutment portion (41) for abutting against the substrate (2) to support the substrate (2). The abutment portion (41) is telescopically provided to apply a pushing force to the substrate (2) to move toward the side away from the support assembly (10).

8. The welding fixture according to claim 7, characterized in that, The abutment portion (41) is rod-shaped, and the support member (40) further includes: A cylindrical body (42) is disposed on the support assembly (10), and one end of the abutment portion (41) is retractably disposed in the inner hole of the cylindrical body (42); An elastic element is disposed in the inner hole, one end of the elastic element is connected to the cylindrical body (42), and the other end of the elastic element is connected to the abutment part (41).

9. The welding fixture according to claim 7, characterized in that, The support component (10) includes: A plate-shaped support member (11), wherein the limiting structure (20) is disposed on the plate surface of the plate-shaped support member (11); Support legs (12) are provided on the plate surface of the plate-shaped support member (11) away from the limiting structure (20) to support the plate-shaped support member (11); The plate-shaped support member (11) is provided with a plurality of hollow portions (111) located below the substrate (2). The plurality of hollow portions (111) are spaced apart along the length direction and / or width direction of the plate-shaped support member (11). The plate-shaped support member (40) between two adjacent hollow portions (111) forms a mounting portion (112). There are multiple support members (40). When the substrate (2) is less than or equal to a preset size, multiple support members (40) are arranged around multiple hollow portions (111). When the substrate (2) is greater than the preset size, at least a portion of the support members (40) are arranged around multiple hollow portions (111). At least another portion of the support members (40) are arranged on the mounting portion (112).

10. The welding fixture according to claim 2, characterized in that, The clamping structure (31) is plate-shaped and includes an interconnected connecting layer and a clamping layer. The clamping layer is used to abut against the workpiece (1) to be welded. The connecting layer is located between the clamping layer and the clamping body (32) to connect the clamping layer and the clamping body (32). The clamping layer is made of a flexible material. The thickness T1 of the connecting layer satisfies: 180um ≤ T1 ≤ 220um, and the thickness T2 of the clamping layer satisfies: 100um ≤ T2; and / or, The clamping assembly (30) has a transparent portion disposed opposite to the substrate (2) and / or the workpiece to be welded (1).

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