Welding jig

Abstract

The invention 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. The problem that in the prior art, the Mini LED chip deviates or inclines in the welding process is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of display chip processing, and in particular to a welding jig. Background Art

[0002] At present, Mini LED (sub-millimeter light emitting diode) is widely used in screens. Compared with conventional-sized LED chips, in order to ensure the consistency of light color of the screen at various observation angles, Mini LED has higher installation accuracy requirements, that is, it is necessary to ensure that all Mini LED chips are soldered horizontally on the pads as much as possible, so as to ensure that the light-emitting surface of the Mini LED chip and the substrate are both horizontally set, thereby ensuring the consistency of light color of the screen.

[0003] In the prior art, manufacturers usually apply solder paste on the pad, then mount the Mini LED chip on the solder paste, and then solder the Mini LED chip to the substrate through reflow soldering.

[0004] However, during the reflow soldering process, the Mini LED chip will shift or tilt as it follows the flow of the heated liquid solder paste, causing the light-emitting surface of the Mini LED chip and the substrate to no longer be parallel to each other and the light color consistency of the screen to be severely reduced. Summary of the invention

[0005] The main purpose of the present invention is to provide a welding jig to solve the problem of Mini LED chips being offset or tilted during the welding process in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a welding jig for positioning a workpiece to be welded and a substrate during a welding process between the workpiece to be welded and the substrate, the welding jig comprising: a supporting assembly; a limiting structure, which is arranged on the supporting assembly, the limiting structure having a first limiting recess and a second limiting recess, the first limiting recess being arranged close to the supporting assembly relative to the second limiting recess, the first limiting recess being used to accommodate the substrate so as to position the substrate through a limiting stop between its inner wall and the substrate; a clamping assembly, which is used to clamp the workpiece to be welded on the substrate, at least part of the clamping assembly is located in the second limiting recess, the clamping assembly comprises a clamping structure for abutting against the workpiece to be welded; wherein at least part of the clamping structure is made of a flexible material, and during the clamping process of the clamping assembly, the part of the clamping structure abutting against the workpiece to be welded is deformed to form a third limiting recess for accommodating the workpiece to be welded, and a limiting stop is formed between at least part of the inner wall of the third limiting recess and the workpiece to be welded so as to position the workpiece to be welded.

[0007] Furthermore, the clamping assembly also includes: a clamping body, at least part of which is located in the second limiting recess, and a clamping structure is arranged on the clamping body; wherein, a limiting stop is provided between at least part of the inner wall of the second limiting recess and the clamping body to position the clamping body.

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

[0009] Furthermore, the limiting structure includes a plurality of limiting members arranged around the substrate, each limiting member having: a second sub-limiting recess, a bottom wall of the second sub-limiting recess being used to support the clamping assembly, and at least a portion of the inner side wall of the second sub-limiting recess being used to limit the stop with the clamping assembly; wherein the second sub-limiting recess extends to at least a portion of the outer circumferential 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 a second limiting recess.

[0010] Furthermore, each limiting member also has: a first sub-limiting recess, which is arranged on the bottom wall of the second sub-limiting recess, the bottom wall of the first sub-limiting recess is used to support the substrate, and at least part of the inner wall of the first sub-limiting recess is used to limit the stop with the substrate; wherein the first sub-limiting recess extends to at least part 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, there is a total height H between the substrate and the part to be welded, and the preset distance L and the total height H satisfy: (HL) ≥ 0.2 mm.

[0012] Furthermore, the welding jig also includes: a support member, which is arranged on the support assembly and located below the substrate, and the support member includes an abutment portion, which is used to abut against the substrate to support the substrate; wherein the abutment portion is telescopically arranged to apply a thrust force to the substrate to move toward a side away from the support assembly.

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

[0014] Further, the supporting assembly includes: a plate-like carrier, a limiting structure is arranged on the plate surface of the plate-like carrier; a support foot is arranged on the plate surface of the plate-like carrier away from the limiting structure, so as to support the plate-like carrier; a plurality of hollow portions located below the substrate are arranged on the plate-like carrier, the plurality of hollow portions are arranged at intervals along the length direction and / or width direction of the plate-like carrier, and the plate-like supporting member between two adjacent hollow portions forms a mounting portion; wherein there are a plurality of supporting members, and when the substrate is less than or equal to a preset size, the plurality of supporting members are arranged around the plurality of hollow portions; when the substrate is larger than the preset size, at least a portion of the supporting members are arranged around the plurality of hollow portions; and at least another portion of the supporting members are arranged on the mounting portion.

[0015] Furthermore, the clamping structure is plate-shaped and includes a connecting layer and a clamping layer that are interconnected, 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, and the clamping layer is made of a flexible material; wherein the thickness T1 of the connecting layer satisfies: 180um≤T1≤220umm, the thickness T2 of the clamping layer satisfies: 100um≤T2; and / or the clamping assembly has a transparent portion arranged opposite to the substrate and / or the workpiece to be welded.

[0016] According to the technical solution of the present invention, a welding jig is used to position the workpiece to be welded and the substrate during the welding process between the workpiece to be welded and the substrate. The limiting structure of the welding jig is arranged on the support assembly. The limiting structure has a first limiting recess and a second limiting recess. The first limiting recess is arranged close to the support assembly relative to the second limiting recess. The first limiting recess is used to accommodate the substrate so as to position the substrate through the limiting stop between its inner wall and the substrate. The clamping assembly is used to clamp the workpiece to be welded on the substrate. At least part of the clamping assembly is located in the second limiting recess. The clamping assembly includes a clamping structure for abutting against the workpiece to be welded. Among them, at least part of the clamping structure is made of flexible material. During the clamping process of the clamping assembly, the part of the clamping structure abutting against the workpiece to be welded is deformed to form a third limiting recess for accommodating the workpiece to be welded. At least part of the inner wall of the third limiting recess is a limiting stop between the workpiece to be welded to position the workpiece to be welded. In this way, after the staff places the substrate in the first limiting recess to position the substrate through the first limiting recess, they operate the clamping assembly to press the part to be welded onto the substrate. During the clamping process of the clamping assembly, the part of the clamping structure made of flexible material that abuts the part to be welded will deform, and a third limiting recess that can accommodate the part to be welded will be generated, thereby positioning the part to be welded. Compared with the traditional positioning method that relies on pressing friction, the third limiting recess in the present application can effectively position the tiny-sized part to be welded (Mini LED chip) (no longer limited by the problem of insufficient pressing friction due to the small contact area), thereby avoiding the shaking and offset of the part to be welded and the substrate during the welding process, ensuring a sufficiently high welding quality between the part to be welded and the substrate, thereby solving the problem of Mini LED chip offset or tilting during the welding process in the prior art, and improving the light and color consistency of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[0019] Figure 2 Shows Figure 1 A partial enlarged view of the

[0020] Figure 3 Shows Figure 1 A top view of the welding fixture in FIG.

[0021] Figure 4 Shows Figure 1Bottom view of the welding fixture in FIG.

[0022] Figure 5 Shows Figure 1 A side view of the welding fixture in FIG.

[0023] Figure 6 Shows Figure 1 Schematic diagram of the local structure of the welding fixture;

[0024] Figure 7 Shows Figure 6 A local enlarged schematic diagram in FIG.

[0025] Figure 8 A schematic diagram of the overall structure of a Mini LED chip welded on a substrate in the prior art is shown.

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

[0027] 1. Parts to be welded; 2. Substrate; 3. Solder pad; 4. Solder paste;

[0028] 10. Support assembly; 11. Plate-shaped bearing member; 111. Hollow portion; 112. Mounting portion; 113. Mounting hole; 12. Support foot;

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

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

[0031] 40. Support member; 41. Abutment portion; 42. Cylindrical body. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0035] In order to solve the problem of Mini LED chips being offset or tilted during the welding process in the prior art, the present application provides a welding jig.

[0036] like Figures 1 to 7 As shown, the welding jig is used to position the workpiece 1 to be welded and the substrate 2 during the welding process between the workpiece 1 to be welded and the substrate 2, and the welding jig includes: a support component 10; a limiting structure 20, which is arranged on the support component 10, and the limiting structure 20 has a first limiting recess 21 and a second limiting recess 22, and the first limiting recess 21 is arranged close to the support component 10 relative to the second limiting recess 22, and the first limiting recess 21 is used to accommodate the substrate 2 to position the substrate 2 through the limiting stop between its inner wall and the substrate 2; a clamping component 30, which is used to clamp the workpiece 1 to be welded on the substrate 2, and at least part of the clamping component 30 is located in the second limiting recess 22, and the clamping component 30 includes a clamping structure 31 for abutting against the workpiece 1 to be welded. Among them, at least part of the clamping structure 31 is made of flexible material. During the clamping process of the clamping assembly 30, the part of the clamping structure 31 that abuts against the workpiece 1 to be welded is deformed to form a third limiting recess for accommodating the workpiece 1 to be welded. A limiting stop is formed between at least part of the inner wall of the third limiting recess and the workpiece 1 to be welded to position the workpiece 1 to be welded.

[0037] Applying the technical solution of this embodiment, the welding jig is used to position the workpiece 1 to be welded and the substrate 2 during the welding process between the workpiece 1 to be welded and the substrate 2. The limiting structure 20 of the welding jig is arranged on the supporting assembly 10. The limiting structure 20 has a first limiting recess 21 and a second limiting recess 22. The first limiting recess 21 is arranged close to the supporting 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 through the limiting stop between its inner wall and the substrate 2. The clamping assembly 30 is used to clamp the workpiece 1 to be welded on the substrate 2. At least part of the clamping assembly 30 is located in the second limiting recess 22. The clamping assembly 30 includes a clamping structure 31 for abutting against the workpiece 1 to be welded. Among them, at least part of the clamping structure 31 is made of flexible material. During the clamping process of the clamping assembly 30, the part of the clamping structure 31 that abuts against the workpiece 1 to be welded is deformed to form a third limiting recess for accommodating the workpiece 1 to be welded. A limiting stop is formed between at least part of the inner wall of the third limiting recess and the workpiece 1 to be welded to position the workpiece 1 to be welded. In this way, after the staff places the substrate 2 in the first limiting recess 21 to position the substrate 2 through the first limiting recess 21, the clamping assembly 30 is operated to press the part to be welded 1 onto the substrate 2. During the clamping process of the clamping assembly 30, the part of the clamping structure 31 made of flexible material that abuts the part to be welded 1 will be deformed, and a third limiting recess that can accommodate the part to be welded 1 will be generated, thereby positioning the part to be welded 1. Compared with the traditional positioning method that relies on pressing friction, the third limiting recess in this embodiment can effectively position the tiny-sized part to be welded 1 (Mini LED chip) (no longer limited by the problem of insufficient pressing friction due to the small contact area), thereby avoiding the shaking and offset of the part to be welded 1 and the substrate 2 during the welding process, ensuring that the welding quality between the part to be welded 1 and the substrate 2 is sufficiently high, thereby solving the problem of MiniLED chip offset or tilting during the welding process in the prior art, and improving the light color consistency of the screen.

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

[0039] Specifically, a soldering pad 3 for soldering is also provided on the substrate 2, solder paste 4 is smeared on the soldering pad 3, the component 1 to be soldered is set on the solder paste 4, and the solder paste 4 is melted by reflow soldering, so as to solder the substrate 2 and the component 1 to be soldered.

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

[0041] like Figure 7 As shown, this is a side view of the local structure after the Mini LED chip and the substrate 2 are positioned and welded using the welding fixture in this embodiment. The Mini LED chip is completely horizontal and the light color consistency of the screen is extremely high.

[0042] like Figures 1 to 7 As shown, the clamping assembly 30 also includes: a clamping body 32, at least part of which is located in the second limiting recess 22, and a clamping structure 31 is arranged on the clamping body 32. Among them, at least part of the inner wall of the second limiting recess 22 and the clamping body 32 are limited and stopped, and the clamping body 32 is positioned. In this way, the above arrangement enables the second limiting recess 22 to also limit and stop the clamping assembly 30 (clamping body 32) and position it, so as to prevent the clamping assembly 30 from shaking or tilting, thereby improving the reliability of the clamping assembly 30 in positioning the workpiece 1 to be welded.

[0043] Specifically, the clamping assembly 30 in this embodiment actually adopts a manual clamping method, that is, it is necessary to rely on the staff to manually clamp the clamping assembly 30 to achieve the clamping action of the clamping assembly 30. By limiting the clamping body 32 through the second limiting recess 22, it can effectively reduce the difficulty of manual operation of the staff and improve the positioning reliability of the clamping assembly 30.

[0044] In other embodiments not shown in the drawings, an additional driving structure may also be provided to drive the clamping assembly to move up and down, so as to achieve 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, and the projection of the workpiece 1 to be welded on the clamping surface 311 is located inside 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 inside the mounting surface 321. In this way, the above arrangement ensures, on the one hand, that the clamping structure 31 can synchronously clamp multiple workpieces 1 to be welded, thereby ensuring that the multiple workpieces 1 to be welded have a high positioning consistency, and further ensuring that the welding quality of the multiple workpieces 1 to be welded has a high synchronization, further improving the light 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, the clamping structure 31 and the clamping body 32 are both rectangular plate structures with the same size. The second limiting recess 22 matches the structure of the clamping body 32, and a limiting stop is provided between the inner side wall of the second limiting recess 22 and the outer peripheral surface of the clamping body 32 to position the clamping body 32.

[0047] In this embodiment, the substrate 2 is a rectangular plate-shaped structure, the first limiting recess 21 matches the structure of the substrate 2, and a limiting stop is formed between the inner side wall of the first limiting recess 21 and the outer peripheral surface of the substrate 2 to position the substrate 2.

[0048] In this embodiment, the dimensions (length and width) of the clamping body 32 and the clamping structure 31 are larger than the dimensions (length and width) of the substrate 2 to ensure that the clamping structure 31 can simultaneously clamp multiple welded parts 1 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 carry the clamping assembly 30, and at least part of the inner side wall of the second sub-limiting recess 231 is used to limit and stop with the clamping assembly 30. Among them, the second sub-limiting recess 231 extends to at least part 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 connected to each other through the second openings 232 of each second sub-limiting recess 231 to surround and form the second limiting recess 22. In this way, the above-mentioned arrangement reduces the overall size and mass of the limiting structure 20 (that is, it only includes a plurality of limiting members 23 with reduced volume and mass), thereby realizing the lightweight design of the welding jig and reducing the difficulty of the staff in transporting the welding jig. On the other hand, the second limiting recess 22 is formed in a simpler manner, is easier to process and realize, and the processing cost of the limiting member 23 is reduced.

[0050] In this embodiment, the position-limiting member 23 is a rectangular parallelepiped structure, and the second sub-position-limiting recess 231 is a rectangular recess arranged on its upper surface, and the second sub-position-limiting recess 231 extends to two adjacent outer surfaces of the position-limiting member 23 of the rectangular parallelepiped structure to form a second opening 232. In this way, the above arrangement enables the structure of the second sub-position-limiting recess 231 to match the structure of the clamping body 32, so as to ensure that its inner side wall can reliably limit and stop the outer peripheral surface of the clamping body 32.

[0051] like Figures 1 to 3 and Figure 5As shown, each stopper 23 also has a first sub-stopper recess 233, which is arranged on the bottom wall of the second sub-stopper recess 231. The bottom wall of the first sub-stopper recess 233 is used to carry the substrate 2, and at least part of the inner side wall of the first sub-stopper recess 233 is used to stop the substrate 2; wherein, the first sub-stopper recess 233 extends to at least part of the outer peripheral surface of the stopper 23 to form a first opening 234, and the first sub-stopper recesses 233 of each stopper 23 are connected to each other through the first openings 234 of each first sub-stopper recess 233 to surround and form the first stopper recess 21. In this way, the first sub-stopper recess 233 is actually located below the second sub-stopper recess 231, that is, it is ensured that the clamping body 32 can be located above the substrate 2 to drive the clamping structure 31 arranged thereon to perform a clamping action. At the same time, the above arrangement also makes the formation method of the first stopper recess 21 simpler, easy to process and realize, and also reduces the processing cost of the stopper 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, stopping and positioning the substrate 2, and extending to the same side of the limiting member 23 to which the second sub-limiting recess 231 extends to form a first opening 234.

[0053] In this embodiment, there are four limiting members 23, and the four limiting members 23 are respectively located at the four vertices of the rectangular plate-shaped substrate 2, so that the first limiting recess 21 is formed by surrounding the four first sub-limiting recesses 233 of the four limiting members 23, and the second limiting recess 22 is formed by surrounding the four second sub-limiting recesses 231 of the four limiting members 23.

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

[0055] Optionally, in a 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, there is a total height H between the substrate 2 and the workpiece 1 to be welded, and the preset distance L and the total height H satisfy: (HL) ≥ 0.2 mm. In this way, the above arrangement makes the installed workpiece 1 to be welded slightly higher than the bottom wall of the second sub-limiting recess 231, so as to ensure that during the pressing process of the clamping assembly 30, the clamping structure 31 can stably form a sufficiently large structure to form a third limiting recess with sufficiently high positioning reliability. At the same time, the above arrangement also makes the size setting more flexible and diverse to adapt to different working conditions and usage requirements, and also improves the processing flexibility of the staff.

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

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

[0058] like Figure 1 , Figure 3 and Figure 5 As shown, the welding jig further includes: a support member 40, which is arranged on the support assembly 10 and is located below the substrate 2. The support member 40 includes an abutting portion 41, which is used to abut against the substrate 2 to support the substrate 2; wherein the abutting portion 41 is telescopically arranged to apply a thrust force to the substrate 2 moving toward a side away from the support assembly 10. In this way, by supporting the substrate 2 through the support member 40, on the one hand, it is possible to avoid excessive deformation of the support member 40, which may affect the welding quality of the workpiece 1 to be welded, or even cause damage or breakage of the substrate 2; on the other hand, the telescopically arranged abutting portion 41 can also provide a certain amount of deformation for the substrate 2 when the instantaneous downward pressure of the clamping assembly 30 is too large, so as to avoid a hard collision between the clamping assembly 30 and the workpiece 1 to be welded, which may cause damage to the workpiece 1 to be welded, so that the welding jig can provide certain protection for the substrate 2 and the workpiece 1 to be welded, thereby reducing the defective 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, which is arranged on the support assembly 10, and one end of the abutment portion 41 is telescopically arranged in the inner hole of the cylindrical body 42; an elastic member, which is arranged in the inner hole, one end of the elastic member is connected to the cylindrical body 42, and the other end of the elastic member is connected to the abutment portion 41. In this way, the above arrangement makes the structure of the support member 40 simpler and easier to process, thereby reducing the processing cost of the support member 40; on the other hand, the arrangement of the elastic member enables the magnitude of the thrust provided by the abutment portion 41 to match the deformation degree of the substrate 2 (that is, the greater the deformation of the substrate 2, the greater the elastic force provided by the elastic member, and the greater the thrust), so as to achieve spontaneous adaptation of the thrust, and further avoid the phenomenon that the deformation degree of the substrate 2 is too large and causes it to break or be damaged.

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

[0061] like Figures 1 to 7As shown, the support assembly 10 includes: a plate-like carrier 11, a limiting structure 20 is arranged on the plate surface of the plate-like carrier 11; a support leg 12 is arranged on the plate surface of the plate-like carrier 11 away from the limiting structure 20, so as to support the plate-like carrier 11; a plurality of hollow portions 111 located below the substrate 2 are arranged on the plate-like carrier 11, and the plurality of hollow portions 111 are arranged at intervals along the length direction and / or width direction of the plate-like carrier 11, and the plate-like support member 40 between two adjacent hollow portions 111 forms a mounting portion 112; wherein, there are a plurality of support members 40, and when the substrate 2 is less than or equal to a preset size, the plurality of support members 40 are arranged around the plurality of hollow portions 111; when the substrate 2 is larger than the preset size, at least a portion of the support members 40 are arranged around the plurality of hollow portions 111; and at least another portion of the support members 40 are arranged on the mounting portion 112. In this way, the above arrangement, on the one hand, realizes the lightweight design of the plate-like carrier 11 through the hollow portion 111, thereby reducing the overall mass of the welding jig and reducing the difficulty of transportation by the staff; on the other hand, the arrangement of the legs 12 enables a space to be formed below the plate-like carrier 11, that is, the devices and circuits used in the welding process can be connected to the substrate 2 through the space below the plate-like carrier 11 and the hollow portion 111, thereby ensuring that the welding process can proceed smoothly. At the same time, the number and position of the support members 40 make their support range more flexible and diverse, so as to match the actual size of the substrate 2, thereby avoiding the rigidity of the middle area of ​​the oversized substrate 2 being too small, which causes the middle area to be easily deformed (that is, the support members 40 located on the mounting portion 112 can further support this area).

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

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

[0064] In this embodiment, the plate-shaped carrier 11 is further provided with a mounting hole 113 , and the mounting hole 113 is used to mount the support leg 12 .

[0065] Optionally, the clamping structure 31 is plate-shaped and includes a connecting layer and a clamping layer that are connected to each other. 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; wherein 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 that is arranged relative to the substrate 2 and / or the workpiece 1 to be welded. In this way, the above-mentioned setting enables the clamping layer made of flexible material to be connected to the clamping body 32 through the connecting layer; on the other hand, the thickness setting of the connecting layer and the clamping layer not only ensures that the connecting layer can be reliably connected, but also ensures that the clamping layer can be deformed sufficiently to produce a third limiting recess with a sufficiently large depth. At the same time, the setting of the transparent portion enables the staff to visually observe the melting state of the solder paste at the welding position to determine whether the welding has been successful.

[0066] In this embodiment, the thickness T1 of the connecting layer is 200um, and the entire connecting layer is made of heat-resistant and heat-insulating materials to prevent temperature conduction from causing the temperature of the pressing body 32 to rise, thereby scalding the staff. At the same time, the setting of the thickness T1 in this embodiment also helps to ensure reliable heat insulation.

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

[0068] Specifically, the overall size (length and width) of the clamping layer is actually larger than the size (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 abutting against the part 1 to be welded are deformed, the remaining part of the clamping layer will not be deformed, and will move to abut against the surface of the substrate 2 where the part 1 to be welded is not provided. This part of the clamping layer can press down the substrate 2 to prevent the substrate 2 from deforming, thereby reducing the "warping" problem of the substrate 2, ensuring that the substrate 2 is completely level, further improving the welding quality between the substrate 2 and the part 1 to be welded, and improving the light and color consistency of the screen.

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

[0070] In this embodiment, the clamping body 32 is a glass plate, which is transparent as a whole. The clamping layer and the connecting layer are also transparent, that is, the clamping assembly 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, and the specific method of use is as follows:

[0072] Step S1: placing the substrate 2 with the component 1 to be welded, the pad 3 and the solder paste 4 installed in the first limiting recess 21 on the special fixture (welding fixture) of the corresponding model, with the component 1 to be welded facing upward as a whole;

[0073] Step S2: gently place the clamping assembly 30 in the second limiting recess 22, with the side with the clamping structure 31 facing downward, that is, opposite to the welded part 1;

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

[0075] Step S4: After welding is completed, the welding jig is taken out, and the pressing assembly 30 can be removed after the temperature thereof cools down to room temperature;

[0076] Step S5: After removing the clamping assembly 30, tear off the clamping layer and the connecting layer from the clamping body 32, and use a flux cleaning agent to clean the residual flux paste on the clamping body 32. After cleaning, the connecting layer and the clamping layer can be re-applied to achieve the reuse of the clamping assembly 30.

[0077] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0078] The welding jig is used to position the workpiece to be welded and the substrate during the welding process between the workpiece to be welded and the substrate. The limiting structure of the welding jig is arranged on the support assembly. The limiting structure has a first limiting recess and a second limiting recess. The first limiting recess is arranged close to the support assembly relative to the second limiting recess. The first limiting recess is used to accommodate the substrate so as to position the substrate through the limiting stop between its inner wall and the substrate. The clamping assembly is used to clamp the workpiece to be welded on the substrate. At least part of the clamping assembly is located in the second limiting recess. The clamping assembly includes a clamping structure for abutting against the workpiece to be welded. Among them, at least part of the clamping structure is made of flexible material. During the clamping process of the clamping assembly, the part of the clamping structure abutting against the workpiece to be welded is deformed to form a third limiting recess for accommodating the workpiece to be welded. At least part of the inner wall of the third limiting recess is a limiting stop between the workpiece to be welded to position the workpiece to be welded. In this way, after the staff places the substrate in the first limiting recess to position the substrate through the first limiting recess, they operate the clamping assembly to press the part to be welded onto the substrate. During the clamping process of the clamping assembly, the part of the clamping structure made of flexible material that abuts the part to be welded will deform, and a third limiting recess that can accommodate the part to be welded will be generated, thereby positioning the part to be welded. Compared with the traditional positioning method that relies on pressing friction, the third limiting recess in the present application can effectively position the tiny-sized part to be welded (Mini LED chip) (no longer limited by the problem of insufficient pressing friction due to the small contact area), thereby avoiding the shaking and offset of the part to be welded and the substrate during the welding process, ensuring a sufficiently high welding quality between the part to be welded and the substrate, thereby solving the problem of Mini LED chip offset or tilting during the welding process in the prior art, and improving the light and color consistency of the screen.

[0079] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A welding jig, used for positioning a workpiece (1) to be welded and a substrate (2) during welding between the workpiece (1) and the substrate (2), characterized in that: The welding jig comprises: Support assembly (10); a limiting structure (20) arranged on the supporting assembly (10), the limiting structure (20) comprising a first limiting recess (21) and a second limiting recess (22), the first limiting recess (21) being arranged closer to the supporting assembly (10) relative to the second limiting recess (22), the first limiting recess (21) being used to accommodate the substrate (2) so as to position the substrate (2) through a limiting stop between its inner wall and the substrate (2); a pressing assembly (30) for pressing the workpiece to be welded (1) onto the substrate (2), at least a portion of the pressing assembly (30) being located in the second limiting recess (22), and the pressing assembly (30) comprising a pressing structure (31) for abutting against the workpiece to be welded (1); Wherein, at least a portion of the clamping structure (31) is made of a flexible material, and during the clamping process of the clamping assembly (30), the portion of the clamping structure (31) that abuts against the part to be welded (1) is deformed to form a third limiting recess for accommodating the part to be welded (1), and a limiting stop is formed between at least a portion of the inner wall of the third limiting recess and the part to be welded (1) to position the part to be welded (1).

2. The welding jig according to claim 1, characterized in that: The pressing assembly (30) further comprises: A pressing body (32), at least a portion of the pressing body (32) is located in the second limiting recess (22), and the pressing structure (31) is arranged on the pressing body (32); Wherein, at least part of the inner wall of the second limiting recess (22) forms a limiting stop with the clamping body (32), thereby positioning the clamping body (32).

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

4. The welding jig according to any one of claims 1 to 3, characterized in that: The limiting structure (20) comprises a plurality of limiting members (23) arranged around the substrate (2), and each of the limiting members (23) has: A second sub-limiting recess (231), wherein 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 side wall of the second sub-limiting recess (231) is used to limit and stop the clamping assembly (30); The second sub-limiting recess (231) extends to at least a portion of the outer circumference 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 via the second openings (232) of each second sub-limiting recess (231) to surround and form the second limiting recess (22).

5. The welding jig according to claim 4, characterized in that: Each of the limiting members (23) further comprises: A first sub-limiting recess (233) is arranged on the bottom wall of the second sub-limiting recess (231), the bottom wall of the first sub-limiting recess (233) being used to support the substrate (2), and at least part of the inner side wall of the first sub-limiting recess (233) being used to limit and stop the substrate (2); The first sub-limiting recess (233) extends to at least a portion of the outer circumference 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 and form the first limiting recess (21).

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

7. The welding jig according to claim 1, characterized in that: The welding jig further comprises: A support member (40) is arranged on the support assembly (10) and is located below the substrate (2); the support member (40) comprises an abutment portion (41), and the abutment portion (41) is used to abut against the substrate (2) to support the substrate (2); The abutment portion (41) is telescopically arranged to apply a thrust force to the base plate (2) to move toward a side away from the support assembly (10).

8. The welding jig according to claim 7, characterized in that: The abutment portion (41) is rod-shaped, and the support member (40) further comprises: A cylindrical body (42) is arranged on the supporting assembly (10), and one end of the abutting portion (41) is telescopically arranged in the inner hole of the cylindrical body (42); An elastic member is arranged in the inner hole, one end of the elastic member is connected to the cylindrical body (42), and the other end of the elastic member is connected to the abutting portion (41).

9. The welding jig according to claim 7, characterized in that: The support assembly (10) comprises: A plate-shaped carrier (11), wherein the limiting structure (20) is arranged on a plate surface of the plate-shaped carrier (11); A support foot (12) is arranged on a plate surface of the plate-shaped carrier (11) away from the limiting structure (20) to support the plate-shaped carrier (11); The plate-shaped carrier (11) is provided with a plurality of hollow portions (111) located below the substrate (2); the plurality of hollow portions (111) are arranged at intervals along the length direction and / or width direction of the plate-shaped carrier (11); and the plate-shaped support member (40) between two adjacent hollow portions (111) forms a mounting portion (112); There are a plurality of support members (40), and when the substrate (2) is smaller than or equal to a preset size, the plurality of support members (40) are arranged around the plurality of hollow portions (111); when the substrate (2) is larger than the preset size, at least a portion of the support members (40) are arranged around the plurality of hollow portions (111); and at least another portion of the support members (40) are arranged on the mounting portion (112).

10. The welding jig according to claim 2, characterized in that: The clamping structure (31) is plate-shaped and comprises a connecting layer and a clamping layer connected to each other, the clamping layer is used to abut against the to-be-welded part (1), the connecting layer is located between the clamping layer and the clamping body (32) to connect the clamping layer and the clamping body (32), and the clamping layer is made of a flexible material; wherein 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 pressing assembly (30) comprises a transparent portion arranged opposite to the substrate (2) and / or the part to be welded (1).

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