Terminal welding clamp and method for fixing to-be-welded terminal on substrate

Abstract

The invention provides a terminal welding clamp and a method for fixing a to-be-welded terminal on a substrate, and the terminal welding clamp comprises a bottom plate which is provided with a bottom plate fixing column; the fixing frame is provided with a rectangular cavity and an opening and is suitable for fixing the DBC; the fixed frame is also provided with a fixed frame fixing hole; the support is provided with a through first opening, and the terminal can be vertically inserted from the upper side and can penetrate out of the support; a first supporting table is arranged above the periphery of the first opening, and first grooves allowing the upper ends of the terminals to be inserted and clamped are formed in the two sides of the inner wall of the first opening; the side edge of the support is provided with a through first jack which can allow a terminal to be vertically inserted from the upper part and to penetrate out. The bracket is also provided with a bracket fixing hole; the fixing block is provided with an open hole, and the top end of the terminal can be inserted and clamped in the open hole; the fixing block is further provided with a fixing block fixing column. According to the terminal welding clamp, when the support and the bottom plate are assembled, the terminal and the support do not need to be assembled in advance, the working efficiency is high, the bottom plate with a product and the support do not need to be inclined, and the risk that the terminal falls off does not exist.

Description

Technical Field

[0001] The present invention belongs to the technical field of terminal welding jigs, and particularly relates to a terminal welding jig and a method for fixing terminals to be welded on a substrate. Background Art

[0002] In the packaging and welding process of a power module, there is a process flow of secondary reflow. In this process, welding and product assembly are involved, especially for products with terminals. During assembly, the assembly process of existing terminal welding jigs usually requires an inverted installation method. First, the terminals are placed on an inverted bracket, then the product to be welded to the terminals is placed on the bottom plate. Then, one hand holds the bottom plate and the other hand holds the inverted bracket, and the bottom plate and the bracket are slowly tilted to align the bottom plate fixing post and the bracket fixing hole at the end close to the bottom surface of both, and then the bottom plate and the bracket are quickly combined to complete the assembly. Chinese patent document with publication number CN 221509901 U discloses a needle-shaped terminal welding positioning structure and a positioning jig. The needle-shaped terminal welding positioning structure includes a bottom frame and a needle plate assembly. The bottom frame is adapted to place a substrate thereon; the needle plate assembly includes a support plate connected to the bottom frame and a terminal mounting plate connected to the support plate. The support plate and the bottom frame are arranged opposite to each other in the up-down direction. The terminal mounting plate is located between the bottom frame and the needle plate assembly. A plurality of insertion holes are provided on the terminal mounting plate, and the plurality of insertion holes are adapted to allow the needle-shaped terminals to be inserted therein, and the bottom ends of the needle-shaped terminals extend out from the corresponding insertion holes to be pressed against the substrate; the terminal mounting plate can move relative to the support plate, so that the terminal mounting plate can continuously provide a pressing force on the needle-shaped terminals to press the needle-shaped terminals against the substrate. During welding, an inverted installation method is adopted. First, the needle-shaped terminal welding positioning structure is inverted, that is, the support plate is at the bottom, then the needle-shaped terminals are inserted into the corresponding insertion holes, and then the substrate and the bottom frame are pressed against the needle-shaped terminals, and then the entire needle-shaped terminal welding positioning structure is turned so that the bottom frame is at the bottommost end, and then normal welding operations are carried out to ensure that the bottom ends of the needle-shaped terminals are always in contact with the substrate. This kind of bracket can solve the problems of terminal welding and fixing. However, this kind of bracket requires extra time to assemble the terminals with the bracket in advance, and the work efficiency is low. Moreover, when the bracket and the bottom plate are assembled, the bottom plate with the product and the bracket need to be tilted, and the product has a risk of falling, and the requirement for the operator's operation level is high, and the training difficulty is large. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a terminal welding jig and a method for fixing terminals to be welded on a substrate. When fixing the terminals, there is no need to assemble the terminals with the bracket in advance, which improves the assembly work efficiency. When the bracket and the bottom plate are assembled, it is not necessary to tilt the bottom plate with the product and the bracket, there is no risk of terminal falling, and the operation is simple.

[0004] To solve the above problems, an aspect of the present invention provides a terminal welding fixture, comprising: A bottom plate, with bottom plate fixing posts respectively provided at four corners of the bottom plate; A fixing frame, with a rectangular cavity provided in the middle of the fixing frame, and the first DBC is adapted to be fixed in the rectangular cavity; a fixing frame opening is provided on the side of the fixing frame, and the second DBC is adapted to be fixed in the fixing frame opening; fixing frame fixing holes are respectively provided at four corners of the fixing frame, and the fixing frame fixing holes are matched with the bottom plate fixing posts; A bracket, with a through first opening provided in the middle of the bracket, and the first terminal can be vertically inserted into and pass through the first opening from above the bracket; a first support platform is provided above the outer periphery of the first opening, and first grooves are provided on both sides of the inner wall of the first support platform. Both sides of the upper end of the first terminal can be inserted into and stuck in the first grooves. After the first terminal is fixed by the first grooves, the bottom end of the first terminal is located at a set position of the first DBC; a through first jack is provided on the side of the bracket, and the second terminal can be vertically inserted into and pass through the first jack from above the bracket; the first terminal and the second terminal are terminals of different types; bracket fixing holes are respectively provided at four corners of the bracket, and the bracket fixing holes are matched with the bottom plate fixing posts; A fixing block, with an opening provided on the fixing block, and the top end of the second terminal can be inserted into and stuck in the opening. After the second terminal is fixed by the opening, the bottom end of the second terminal is located at a set position of the second DBC; fixing block fixing posts are respectively provided at both ends of the fixing block. After the bottom plate fixing posts are sequentially inserted into the fixing frame fixing holes and the bracket fixing holes, the fixing block fixing posts can be inserted into the bracket fixing holes.

[0005] Preferably, the fixing frame includes: A first fixing frame, which includes a first wide side, a first narrow side, and a second narrow side. The first narrow side and the second narrow side are perpendicular to the first wide side and are respectively connected to both ends of the first wide side; the fixing frame fixing holes are provided at both ends of the first wide side; A second fixing frame, which includes a second wide side, a third narrow side, and a fourth narrow side. The third narrow side and the fourth narrow side are perpendicular to the second wide side and are respectively connected to both ends of the second wide side; the fixing frame fixing holes are provided at both ends of the second wide side; the first fixing frame and the second fixing frame are combined to form the fixing frame, and the rectangular cavity is formed inside.

[0006] Preferably, when the first fixed frame and the second fixed frame are joined together, the first narrow side is connected to the third narrow side, and the second narrow side is connected to the fourth narrow side; a first step is provided at the end of the first narrow side away from the first wide side, a second step is provided at the end of the third narrow side away from the second wide side, and the first step engages with the second step; a third step is provided at the end of the second narrow side away from the first wide side, a fourth step is provided at the end of the fourth narrow side away from the second wide side, and the third step engages with the fourth step.

[0007] Preferably, the length of the first narrow side is less than the length of the third narrow side, and the length of the second narrow side is greater than the length of the fourth narrow side; a first partition strip is provided on the side of the second narrow side close to the rectangular cavity, and the first partition strip is perpendicular to the second narrow side; a second partition strip is provided on the side of the third narrow side close to the rectangular cavity, and the second partition strip is perpendicular to the third narrow side; the connection line between the first partition strip and the second partition strip can divide the rectangular cavity into two sub-rectangular cavities; the third DBC and the fourth DBC are respectively adapted to be fixed in the sub-rectangular cavities; after the first terminal is fixed by the first groove, the bottom end of the first terminal is located at a set position of the third DBC.

[0008] Preferably, a through second opening is further provided in the middle of the bracket, and the second opening can accommodate the third terminal to be vertically inserted from above the bracket and pass through the second opening; a second support platform is provided above the outer periphery of the second opening, and convex platforms are respectively provided on both sides of the inner wall of the second support platform. The convex platforms and the side wall of the second support platform form a second groove. Both sides of the upper end of the third terminal can be inserted into the second groove and can be stuck in the second groove. After the third terminal is fixed by the second groove, the bottom end of the third terminal is located at a set position of the fourth DBC.

[0009] Preferably, at least two first arc-shaped protrusions are provided on the sides of the first wide side, the first narrow side, the second narrow side, the third narrow side, and the fourth narrow side close to the rectangular cavity; the lengths of the first partition strip and the second partition strip extending into the rectangular cavity are greater than the lengths of the first arc-shaped protrusions extending into the rectangular cavity.

[0010] Preferably, a concave platform is provided on the side of the second wide side close to the rectangular cavity.

[0011] Preferably, at least two second arc-shaped protrusions are respectively provided on the inner sides of the sides of the opening of the fixed frame.

[0012] Preferably, the height of the first support platform is higher than half of the height of the first terminal.

[0013] The second aspect of the present invention provides a method for fixing terminals to be welded on a substrate, which is completed by using the above-mentioned terminal welding fixture, and includes the following steps: S1. Place the bottom plate, place the substrate on the bottom plate, and fix the substrate and the bottom plate through the fixing holes on the substrate and the fixing posts on the bottom plate; S2. Place the fixing frame on the substrate, and fix the fixing frame and the bottom plate through the fixing holes of the fixing frame and the fixing posts of the bottom plate; S3. Place the tin sheet and the first DBC in the rectangular cavity of the fixing frame in sequence, and fix the positions of the tin sheet and the first DBC through the rectangular cavity; place the tin sheet and the second DBC in the opening of the fixing frame in sequence, and fix the positions of the tin sheet and the second DBC through the opening of the fixing frame; S4. Place the bracket on the fixing frame, and fix the bracket and the bottom plate through the bracket fixing holes of the bracket and the bottom plate fixing posts of the bottom plate, with the side of the bracket provided with the first support platform facing upwards; S5. Vertically insert the first terminal from above the bracket into the first opening and pass through the first opening until the bottom end of the first terminal is located at the set position of the first DBC; vertically insert the second terminal from above the bracket into the first jack and pass through the first jack until the bottom end of the second terminal is located at the set position of the second DBC; S6. Place the fixing block above the bracket and directly above the first jack, insert the upper end of the second terminal into the opening on the fixing block, fix the fixing block and the bracket through the bracket fixing holes and the fixing block fixing posts, and fix the top end of the second terminal through the opening.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When the terminal welding fixture of the present invention fixes the terminal, after the bracket is fixed to the bottom plate and the fixing frame, the terminal is directly inserted into the opening or jack of the bracket from directly above, the bottom contacts the DBC in the fixing frame, and the terminal is fixed by the bracket or the fixing block. There is no need to assemble the terminal and the bracket in advance, which improves the assembly work efficiency. When assembling the bracket and the bottom plate, it is not necessary to tilt the bottom plate with the product and the bracket, and there is no risk of terminal dropping. The operation is simple and the requirement for the operation level is not high. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the terminal welding fixture described in the embodiment of the present invention; Figure 2It is a schematic structural view of the bottom plate in the terminal welding fixture according to the embodiment of the present invention; Figure 3 It is a top view of the fixing frame in the terminal welding fixture according to the embodiment of the present invention; Figure 4 It is a top view of the bracket in the terminal welding fixture according to the embodiment of the present invention; Figure 5 It is a top view of the fixing block in the terminal welding fixture according to the embodiment of the present invention.

[0016] Wherein: 1 - bottom plate; 11 - bottom plate fixing column; 2 - fixing frame; 21 - rectangular cavity; 22 - fixing frame opening; 23 - fixing frame fixing hole; 24 - first fixing frame; 241 - first wide side; 242 - first narrow side; 243 - second narrow side; 25 - second fixing frame; 251 - second wide side; 252 - third narrow side; 253 - fourth narrow side; 26 - first step; 27 - second step; 28 - third step; 29 - fourth step; 210 - first partition bar; 211 - second partition bar; 212 - sub - rectangular cavity; 213 - sub - rectangular cavity; 214 - first arc - shaped protrusion; 215 - concave platform; 216 - second arc - shaped protrusion; 3 - bracket; 31 - first opening; 32 - first support platform; 33 - first groove; 34 - first jack; 35 - bracket fixing hole; 36 - second opening; 37 - second support platform; 38 - boss; 39 - second groove; 4 - fixing block; 41 - opening; 42 - fixing block fixing column; 5 - first terminal; 6 - second terminal; 7 - third terminal; 8 - substrate. Detailed implementation manners

[0017] Next, in combination with the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention. Embodiment 1

[0018] As Figure 1 shown, the terminal welding fixture of this embodiment includes: A bottom plate 1, and bottom plate fixing columns 11 are respectively provided at the four corners of the bottom plate 1; A fixing frame 2, a rectangular cavity 21 is provided in the middle of the fixing frame 2, and the first DBC is suitable for being fixed in the rectangular cavity 21; a fixing frame opening 22 is provided on the side of the fixing frame 2, and the second DBC is suitable for being fixed in the fixing frame opening 22; fixing frame fixing holes 23 are respectively provided at the four corners of the fixing frame 2, and the fixing frame fixing holes 23 cooperate with the bottom plate fixing columns 11; A bracket 3, as Figure 4As shown in the figure, a through first opening 31 is provided in the middle of the bracket 3. The first opening 31 can accommodate the first terminal 5 to be vertically inserted from above the bracket 3 and pass through the first opening 31; above the outer periphery of the first opening 31, a first support platform 32 is provided. On both sides of the inner wall of the first support platform 32, first grooves 33 are provided. Both sides of the upper end of the first terminal 5 can be inserted into the first grooves 33 and can be stuck in the first grooves 33. After the first terminal 5 is fixed by the first grooves 33, the bottom end of the first terminal 5 is located at the set position of the first DBC; a through first jack 34 is provided on the side of the bracket 3. The first jack 34 can accommodate the second terminal 6 to be vertically inserted from above the bracket 3 and pass through the first jack 34; the first terminal 5 and the second terminal 6 are terminals of different types; bracket fixing holes 35 are respectively provided at the four corners of the bracket 3, and the bracket fixing holes 35 cooperate with the bottom plate fixing posts 11; The fixing block 4, as Figure 5 shown in the figure, an opening 41 is provided on the fixing block 4. The top end of the second terminal 6 can be inserted into the opening 41 and can be stuck in the opening 41. After the second terminal 6 is fixed by the opening 41, the bottom end of the second terminal 6 is located at the set position of the second DBC; fixing block fixing posts 42 are respectively provided at both ends of the fixing block 4. After the bottom plate fixing posts 11 are sequentially inserted into the fixing frame fixing holes 23 and the bracket fixing holes 35, the fixing block fixing posts 42 can be inserted into the bracket fixing holes 35.

[0019] For the terminals that can be inserted into the grooves on both sides of the upper part for fixing, the fixing method of the first terminal can be adopted, inserted into the first opening of the bracket, and fixed by the first groove. For the terminal structure that cannot be inserted into the grooves for fixing on both sides of the upper part, for example, the sides on both sides of the upper part are not vertical structures but inclined sides, and the top can be inserted into the opening, the fixing method of the second terminal can be adopted, inserted into the first jack, and the top end of the second terminal is fixed by the opening on the fixing block.

[0020] For the terminal welding fixture of this embodiment, during use, first place the bottom plate on an anti-static table, place the substrate on the bottom plate, and fix the substrate and the bottom plate through the fixing holes on the substrate and the fixing posts on the bottom plate; then place the fixing frame on the substrate, and fix the fixing frame and the bottom plate through the fixing holes on the fixing frame and the fixing posts on the bottom plate; next, place the tin sheet and the first DBC in the rectangular cavity of the fixing frame in sequence, and fix the positions of the tin sheet and the first DBC through the rectangular cavity; place the tin sheet and the second DBC in the opening of the fixing frame in sequence, and fix the positions of the tin sheet and the second DBC through the opening of the fixing frame; place the bracket on the fixing frame, and fix the bracket and the bottom plate through the fixing holes of the bracket and the bottom fixing posts of the bottom plate, with the side of the bracket provided with the first support platform facing upward; vertically insert the first terminal from above the bracket into the first opening and pass through the first opening until the bottom end of the first terminal is located at the set position of the first DBC; vertically insert the second terminal from above the bracket into the first jack and pass through the first jack until the bottom end of the second terminal is located at the set position of the second DBC; finally, place the fixing block above the bracket and directly above the first jack, insert the top end of the second terminal into the opening on the fixing block, and fix the fixing block and the bracket through the fixing holes of the bracket and the fixing posts of the fixing block, and fix the upper end of the second terminal through the opening to complete the fixing of the terminal, and then welding can be carried out.

[0021] In the prior art, when the terminal welding fixture fixes the terminal, an upside-down method is adopted, that is, first invert the positioning structure for fixing the needle-shaped terminal, insert the needle-shaped terminal into the corresponding insertion hole from above (that is, from the bottom of the positioning structure), then press the substrate and the bottom frame onto the needle-shaped terminal, flip the positioning structure for fixing the needle-shaped terminal, and then perform normal welding operations to ensure that the bottom end of the needle-shaped terminal is always in contact with the substrate. This fixing method requires assembling the terminal with the positioning structure in advance, resulting in low work efficiency. More importantly, when assembling the positioning structure and the bottom plate, the bottom plate and the bracket with the product need to be tilted, and there is a risk of the product falling. For the terminal welding fixture of this embodiment, when fixing the terminal, after the bracket is fixed to the bottom plate and the fixing frame, the terminal is directly inserted into the opening or jack of the bracket from directly above, the bottom contacts the DBC in the fixing frame, and the terminal is fixed through the bracket or the fixing block, without the need to assemble the terminal with the bracket in advance, improving the assembly work efficiency. When assembling the bracket and the bottom plate, there is no need to tilt the bottom plate and the bracket with the product, there is no risk of the terminal falling, the operation is simple, and the requirement for the operation level is not high.

[0022] Among them, the specific shape of the first opening can be designed according to the shape of the corresponding first terminal, as long as the first terminal can be inserted from above the first opening to the bottom to contact the corresponding DBC. According to the number of terminals actually designed, multiple first openings can be provided; moreover, two, three or more first terminals can also be adapted to be inserted into the first opening simultaneously, and the shape and size of the first opening can be adjusted according to the number of inserted terminals.

[0023] Among them, those skilled in the art can set the number and position of the first grooves according to different terminal models and specifications, and no excessive restrictions are imposed here.

[0024] Among them, the size and position of the opening 41 on the fixing block 4 can be set according to the needs of the actual product.

[0025] Preferably, as Figure 3 shown, the fixing frame 2 includes: A first fixing frame 24, the first fixing frame includes a first wide side 241, a first narrow side 242 and a second narrow side 243, the first narrow side and the second narrow side are perpendicular to the first wide side and are respectively connected to both ends of the first wide side; fixing frame fixing holes 23 are provided at both ends of the first wide side; A second fixing frame 25, the second fixing frame includes a second wide side 251, a third narrow side 252 and a fourth narrow side 253, the third narrow side and the fourth narrow side are perpendicular to the second wide side and are respectively connected to both ends of the second wide side; fixing frame fixing holes are provided at both ends of the second wide side; after the first fixing frame and the second fixing frame are joined together, a fixing frame is formed, and a rectangular cavity 21 is formed inside.

[0026] The fixing frame is formed by joining two half frames together. After the product is welded, the two half frames are opened, and the product can be removed, which is more convenient for the removal of the product in the fixing frame.

[0027] Preferably, when the first fixing frame 24 and the second fixing frame 25 are joined together, the first narrow side is connected to the third narrow side, and the second narrow side is connected to the fourth narrow side; a first step 26 is provided at the end of the first narrow side away from the first wide side, a second step 27 is provided at the end of the third narrow side away from the second wide side, and the first step meshes with the second step; a third step 28 is provided at the end of the second narrow side away from the first wide side, a fourth step 29 is provided at the end of the fourth narrow side away from the second wide side, and the third step meshes with the fourth step. Through the setting of the meshing steps, the first fixing frame and the second fixing frame can be better positioned and aligned when joined together.

[0028] Preferably, the length of the first narrow side is less than that of the third narrow side, and the length of the second narrow side is greater than that of the fourth narrow side; a first partition strip 210 is provided on the side of the second narrow side close to the rectangular cavity, and the first partition strip is perpendicular to the second narrow side; a second partition strip 211 is provided on the side of the third narrow side close to the rectangular cavity, and the second partition strip is perpendicular to the third narrow side; the connection line between the first partition strip 210 and the second partition strip can divide the rectangular cavity into two sub-rectangular cavities 212 and 213; the third DBC and the fourth DBC are respectively adapted to be fixed in the sub-rectangular cavities; after the first terminal is fixed by the first groove, the bottom end of the first terminal is located at the set position of the third DBC. The narrow sides of the fixing frame are divided into two half-frames in an unequal way, so that the two partition strips are respectively located on the two half-frames, and the two DBCs in the rectangular cavity are easier to remove after welding. The arrangement of the partition strips can prevent the two DBCs from contacting due to the melting of the solder during the product reflow, resulting in product failure.

[0029] Preferably, the first fixing frame and the second fixing frame are centrosymmetric about the center of the rectangular cavity, that is, the length of the first narrow side is equal to that of the fourth narrow side, and the second narrow side is equal to the third narrow side in length.

[0030] Wherein, the sizes of the first partition strip and the second partition strip are as short and thin as possible. Their function is to effectively prevent the contact between adjacent two DBCs and reduce the contact area between the fixing frame and the DBCs.

[0031] Preferably, a second through opening 36 is further provided in the middle of the bracket 3. The second through opening 36 can accommodate the third terminal 7 to be inserted vertically from above the bracket 3 and pass through the second through opening 36; a second support platform 37 is provided above the outer periphery of the second through opening 36. On both sides of the inner wall of the second support platform 37, there are convex platforms 38 respectively. The convex platforms and the side walls of the second support platform form a second groove 39. The two sides of the upper end of the third terminal 7 can be inserted into the second groove 39 and can be stuck in the second groove. After the third terminal is fixed by the second groove, the bottom end of the third terminal is located at the set position of the fourth DBC. The third terminal can be a terminal type with a different structure from the first terminal and the second terminal. The specific shape of the second through opening can be designed according to the shape of the corresponding third terminal, as long as the third terminal can be inserted from above the second through opening to the bottom end to contact the corresponding DBC. According to the number of terminals designed actually, multiple second through openings can be provided.

[0032] Preferably, the inner side of the second groove can be chamfered to reduce the contact area between the terminal and the bracket and facilitate disassembly.

[0033] Preferably, at least two first arc-shaped protrusions 214 are provided on one side of the first wide side, the first narrow side, the second narrow side, the third narrow side, and the fourth narrow side close to the rectangular cavity; the lengths of the first partition bar and the second partition bar extending into the rectangular cavity are greater than the length of the first arc-shaped protrusion extending into the rectangular cavity. The setting of the arc-shaped protrusions can reduce the contact area between the narrow side and the DBC, making it easier to disassemble the fixing frame and the product after reflow, and avoiding product damage caused by manual disassembly.

[0034] Preferably, a concave platform 215 is provided on one side of the second wide side 251 close to the rectangular cavity. The setting of the concave platform can reduce the contact area between the second wide side and the DBC, making it easier to disassemble the fixing frame and the product after reflow, and avoiding product damage caused by manual disassembly.

[0035] Preferably, at least two second arc-shaped protrusions 216 are respectively provided on the inner sides of the respective sides of the fixing frame opening 22. The setting of the arc-shaped protrusions can reduce the contact area between the fixing frame opening and the DBC, making it easier to disassemble the fixing frame and the product after reflow, and avoiding product damage caused by manual disassembly.

[0036] Preferably, the height of the first support platform 32 is higher than half of the height of the first terminal 5. Ensure the supporting effect on the terminal.

[0037] Preferably, the height of the second support platform 37 is higher than half of the height of the third terminal 7. Ensure the supporting effect on the terminal.

[0038] Preferably, as Figure 2 shown, the bottom plate 1 is a rectangular planar structure with rounded corners at the four corners, and a bottom plate fixing column 11 is provided at each of the four corners, and the heights of the 4 bottom plate fixing columns 11 are the same.

[0039] Preferably, the bracket 3 is a rectangular structure, and bracket fixing holes 35 matching the bottom plate fixing columns on the bottom plate 1 are provided at the four corners thereof, so that the bracket can be fixed on the bottom plate.

[0040] Preferably, the fixing block 4 is in a long rectangular shape, and two fixing block fixing columns are provided thereon, and the fixing block fixing columns can cooperate with the bracket fixing holes on the bracket to realize the fixing of the fixing block and the bracket.

[0041] Preferably, after the second terminal is inserted into the opening of the fixing block in place, the part exposed outside the fixing block is not more than 3 mm. Embodiment 2

[0042] The method for fixing the terminals to be welded on the substrate in this embodiment is completed by using the above-mentioned terminal welding jig, and includes the following steps: S1. Place the bottom plate on the anti-static table, place the substrate 8 on the bottom plate, and fix the substrate and the bottom plate through the fixing holes on the substrate and the bottom plate fixing columns; S2. Place the first fixing frame and the second fixing frame on the substrate, align the fixing holes on the first fixing frame and the second fixing frame with the bottom plate fixing posts one by one, and fix the fixing frames to the bottom plate through the fixing frame fixing holes and the bottom plate fixing posts; S3. Place the tin sheet and the first DBC in the rectangular cavity of the fixing frame in sequence, and fix the positions of the tin sheet and the first DBC through the rectangular cavity; place the tin sheet and the second DBC in the fixing frame opening of the fixing frame in sequence, and fix the positions of the tin sheet and the second DBC through the fixing frame opening; S4. Place the bracket on the fixing frame, and fix the bracket to the bottom plate through the bracket fixing holes of the bracket and the bottom plate fixing posts of the bottom plate. The side of the bracket provided with the first support platform and the second support platform faces upward; S5. Vertically insert the first terminal from above the bracket into the first opening and pass through the first opening until the bottom end of the first terminal is located at the set position of the first DBC; vertically insert the second terminal from above the bracket into the first jack and pass through the first jack until the bottom end of the second terminal is located at the set position of the second DBC; S6. Place the fixing block above the bracket and directly above the first jack, insert the upper end of the second terminal into the opening on the fixing block, fix the fixing block to the bracket through the bracket fixing holes and the fixing block fixing posts, and fix the top end of the second terminal through the opening; S7. The assembly is completed and ready for the next process.

[0043] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A terminal welding fixture, characterized in that Comprising: A bottom plate, with bottom plate fixing posts respectively provided at four corners of the bottom plate; A fixing frame, with a rectangular cavity provided in the middle of the fixing frame, and the first DBC is adapted to be fixed in the rectangular cavity; a fixing frame opening is provided on the side of the fixing frame, and the second DBC is adapted to be fixed in the fixing frame opening; fixing frame fixing holes are respectively provided at four corners of the fixing frame, and the fixing frame fixing holes are matched with the bottom plate fixing posts; A bracket, with a through first opening provided in the middle of the bracket, and the first terminal can be vertically inserted from above the bracket and pass through the first opening; a first support platform is provided above the outer periphery of the first opening, and first grooves are provided on both sides of the inner wall of the first support platform. Both sides of the upper end of the first terminal can be inserted into the first grooves and can be stuck in the first grooves. After the first terminal is fixed by the first grooves, the bottom end of the first terminal is located at a set position of the first DBC; a through first jack is provided on the side of the bracket, and the second terminal can be vertically inserted from above the bracket and pass through the first jack; the first terminal and the second terminal are different types of terminals; bracket fixing holes are respectively provided at four corners of the bracket, and the bracket fixing holes are matched with the bottom plate fixing posts; A fixing block, with an opening provided on the fixing block, and the top end of the second terminal can be inserted into the opening and can be stuck in the opening. After the second terminal is fixed by the opening, the bottom end of the second terminal is located at a set position of the second DBC; fixing block fixing posts are respectively provided at both ends of the fixing block. After the bottom plate fixing posts are sequentially inserted into the fixing frame fixing holes and the bracket fixing holes, the fixing block fixing posts can be inserted into the bracket fixing holes.

2. The terminal welding jig according to claim 1, wherein, The fixing frame includes: A first fixing frame, which includes a first wide side, a first narrow side and a second narrow side. The first narrow side and the second narrow side are perpendicular to the first wide side and are respectively connected to both ends of the first wide side; the fixing frame fixing holes are provided at both ends of the first wide side; A second fixing frame, which includes a second wide side, a third narrow side and a fourth narrow side. The third narrow side and the fourth narrow side are perpendicular to the second wide side and are respectively connected to both ends of the second wide side; the fixing frame fixing holes are provided at both ends of the second wide side; after the first fixing frame and the second fixing frame are assembled, the fixing frame is formed, and the rectangular cavity is formed inside.

3. The terminal welding fixture according to claim 2, wherein: When the first fixing frame and the second fixing frame are assembled, the first narrow side is connected to the third narrow side, and the second narrow side is connected to the fourth narrow side; a first step is provided at the end of the first narrow side away from the first wide side, and a second step is provided at the end of the third narrow side away from the second wide side, and the first step meshes with the second step; a third step is provided at the end of the second narrow side away from the first wide side, and a fourth step is provided at the end of the fourth narrow side away from the second wide side, and the third step meshes with the fourth step.

4. The terminal welding fixture according to claim 3, wherein: The length of the first narrow side is less than the length of the third narrow side, and the length of the second narrow side is greater than the length of the fourth narrow side; a first partition strip is provided on one side of the second narrow side close to the rectangular cavity, and the first partition strip is perpendicular to the second narrow side; a second partition strip is provided on one side of the third narrow side close to the rectangular cavity, and the second partition strip is perpendicular to the third narrow side; the connection line between the first partition strip and the second partition strip can divide the rectangular cavity into two sub-rectangular cavities; the third DBC and the fourth DBC are respectively adapted to be fixed in the sub-rectangular cavities; after the first terminal is fixed by the first groove, the bottom end of the first terminal is located at a set position of the third DBC.

5. The terminal welding fixture according to claim 4, wherein: A through second opening is further provided in the middle of the bracket, and the second opening can accommodate the third terminal to be vertically inserted from above the bracket and pass through the second opening; a second support platform is provided above the outer periphery of the second opening, and convex platforms are respectively provided on both sides of the inner wall of the second support platform, and the convex platforms and the side wall of the second support platform form a second groove, and both sides of the upper end of the third terminal can be inserted into the second groove and can be stuck in the second groove. After the third terminal is fixed by the second groove, the bottom end of the third terminal is located at a set position of the fourth DBC.

6. The terminal welding fixture according to claim 4, wherein: At least two first arc-shaped protrusions are respectively provided on one side of the first wide side, the first narrow side, the second narrow side, the third narrow side, and the fourth narrow side close to the rectangular cavity; the lengths of the first partition strip and the second partition strip extending into the rectangular cavity are greater than the lengths of the first arc-shaped protrusions extending into the rectangular cavity.

7. The terminal welding fixture according to claim 4, wherein: A concave platform is provided on one side of the second wide side close to the rectangular cavity.

8. The terminal welding fixture according to claim 4, wherein: At least two second arc-shaped protrusions are respectively provided on the inner sides of the respective side edges of the opening of the fixed frame.

9. The terminal welding fixture according to claim 1, wherein: The height of the first support platform is higher than half of the height of the first terminal.

10. A method for fixing terminals to be welded on a substrate, characterized in that, The method is completed by using the terminal welding fixture according to any one of claims 1-9, and includes the following steps: S1. Place the bottom plate, place the substrate on the bottom plate, and fix the substrate and the bottom plate through the fixing holes on the substrate and the fixing posts on the bottom plate; S2. Place the fixed frame on the substrate, and fix the fixed frame and the bottom plate through the fixing holes of the fixed frame and the fixing posts of the bottom plate; S3. Place the tin sheet and the first DBC in the rectangular cavity of the fixed frame in sequence, and fix the positions of the tin sheet and the first DBC through the rectangular cavity; place the tin sheet and the second DBC in the opening of the fixed frame in sequence, and fix the positions of the tin sheet and the second DBC through the opening of the fixed frame; S4. Place the bracket on the fixed frame, and fix the bracket and the bottom plate through the bracket fixing holes of the bracket and the bottom plate fixing posts of the bottom plate, with the side of the bracket provided with the first support platform facing upward; S5. Vertically insert the first terminal from above the bracket into the first opening and pass through the first opening until the bottom end of the first terminal is located at the set position of the first DBC; vertically insert the second terminal from above the bracket into the first jack and pass through the first jack until the bottom end of the second terminal is located at the set position of the second DBC; S6. Place the fixing block above the bracket and directly above the first jack, insert the upper end of the second terminal into the opening in the fixing block, fix the fixing block and the bracket through the bracket fixing hole and the fixing block fixing post, and fix the top end of the second terminal through the opening.

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