Welding jig

Abstract

The utility model provides a welding jig, which is used for welding electrode terminals on a power bottom plate and comprises a limiting frame, a plurality of mounting grooves, a plurality of clamping blocks, a plurality of clamping blocks, a plurality of clamping blocks and a plurality of clamping blocks, and is characterized in that the limiting frame is provided with a plurality of mounting grooves; a plurality of limiting columns, two sides of the limiting frame are provided with a plurality of mounting holes, the plurality of limiting columns are respectively arranged in the plurality of mounting holes, and the power bottom plate is sleeved between the two corresponding limiting columns and is connected with the electrode terminals; and the bearing plate is buckled on the end faces of the limiting columns, abuts against the power bottom plate and is used for limiting the power bottom plate on the limiting columns. When the power bottom plate is installed between the two limiting columns, all the electrode terminals correspond to the welding area of the power bottom plate, the electrode terminals and the power bottom plate can be accurately positioned, the positions of all the components do not need to be frequently and manually adjusted, the assembling efficiency is improved, the bearing plate is installed on the end faces of all the limiting columns in a buckled mode, and the assembling efficiency is improved. And the bearing plate enters the welding furnace as a bearing structure, so that the welding quality is ensured.

Description

Technical Field

[0001] This utility model relates to the field of modular welding technology, and in particular to a welding fixture. Background Technology

[0002] As one of the important high-power mainstream devices in power electronics, IGBT modules have been widely used in home appliances, transportation, power engineering, renewable energy and smart grids. In their packaging process, two soldering processes are generally required. The first is to solder the DBC to the chip with solder to form the DBC sub-unit. The second is to solder the DBC sub-unit to the metal base plate and terminals with solder. When some IGBT modules perform aluminum wire bonding on the soldered DBC sub-units, a third soldering process is required. In order to avoid the DBC sub-units, metal base plates or terminals from shifting during the soldering or transfer process, special soldering fixtures are often required to assist in positioning to meet the normal soldering requirements.

[0003] For example, Chinese patent "CN209199887U" discloses "a welding fixture for IGBT module packaging." This welding fixture uses a DBC unit positioning plate to quickly position the DBC unit, enabling the lead terminals to align quickly and accurately with the lead terminal positioning holes, thus improving the positioning efficiency of the DBC unit. Furthermore, this structure positions the heat sink, DBC unit, and lead terminals, facilitating subsequent welding operations. Although the provided lead terminal positioning holes can assist in the positioning of each lead terminal, during the process of the upper positioning seat engaging with the lower positioning seat, it cannot be guaranteed that each lead terminal corresponds to its respective positioning hole. Frequent manual adjustments are required, thereby reducing the overall efficiency of the welding operation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a welding fixture that solves the problem of low efficiency in existing welding tooling.

[0005] According to the embodiments of this utility model, the following technical solution is adopted:

[0006] A welding fixture for welding electrode terminals to a power base plate, comprising:

[0007] The limiting frame has several mounting slots, and several electrode terminals are respectively inserted into the several mounting slots;

[0008] Several limiting posts are provided, and several mounting holes are provided on both sides of the limiting frame. Several limiting posts are respectively provided in several mounting holes. The power base plate is sleeved between two corresponding limiting posts and connected to the electrode terminals.

[0009] And a bearing plate is buckled to the end face of each limiting column and abuts against the power bottom plate, for limiting the power bottom plate to the limiting column.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In the scheme, through the design of the mounting slot on the limiting frame, all electrode terminals can be respectively correspondingly threaded in each mounting slot in the early stage of welding, the position of each electrode terminal is limited by the position of the mounting slot, and the efficiency is improved; meanwhile, under the cooperation of each limiting column, one power bottom plate corresponds to two limiting columns, when the power bottom plate is installed between the two limiting columns, each electrode terminal corresponds to the welding area of the power bottom plate, so that the electrode terminal and the power bottom plate can be accurately positioned, the position of each component need not be manually adjusted frequently, the assembly efficiency is greatly improved, meanwhile, the bearing plate is buckled and installed on the end face of each limiting column, and the whole is turned over during the welding operation, so that the bearing plate enters the welding furnace as a bearing structure, and the welding quality is guaranteed.

[0012] Preferably, the bearing plate is provided with limiting grooves corresponding to the limiting columns.

[0013] Preferably, the end of the limiting column is sequentially provided with a first boss coaxial with the limiting column and a second boss, each limiting groove is provided with a limiting hole penetrating through the bearing plate, and the first boss and the second boss are respectively threaded in the power bottom plate and the limiting hole.

[0014] Preferably, the end of the limiting column away from the first boss is provided with an installation rod, and the installation rod is threaded in the limiting frame.

[0015] Preferably, the installation rod is a threaded rod, a nut is threadedly connected to the threaded rod, and the nut abuts against the limiting frame.

[0016] Preferably, a gasket is arranged between the nut and the limiting frame.

[0017] Preferably, the bearing plate is provided with a plurality of sink grooves corresponding to the limiting grooves respectively.

[0018] Preferably, the limiting frame is provided with a plurality of through grooves.

[0019] Preferably, each mounting slot is provided with a foolproof opening.

[0020] Preferably, the bearing plate is provided with two recesses corresponding. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an overall assembly structure schematic view of the utility model embodiment.

[0022] Figure 2This is a schematic diagram of the structure in an embodiment of the present invention, showing the separation of the bearing plate from each limiting post.

[0023] Figure 3 This is a three-dimensional structural diagram of each limiting post installed on the limiting frame in an embodiment of this utility model.

[0024] Figure 4 This is a three-dimensional structural diagram of the limiting frame in an embodiment of the present utility model.

[0025] Figure 5 This is a three-dimensional structural diagram of the support plate in an embodiment of this utility model.

[0026] Figure 6 This is a schematic diagram of the planar structure of each limiting post installed on the limiting frame in an embodiment of this utility model.

[0027] In the above attached figures: 1. Support plate; 101. Limiting groove; 102. Limiting hole; 103. Groove; 104. Sink; 2. Limiting frame; 201. Mounting groove; 202. Mounting hole; 203. Anti-fooling opening; 204. Through groove; 3. Limiting post; 301. First boss; 302. Second boss; 303. Mounting rod; 4. Power base plate; 5. Electrode terminal; 6. Nut; 601. Washer. Detailed Implementation

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0029] This utility model embodiment proposes a welding fixture for welding electrode terminals 5 onto a power base plate 4, comprising:

[0030] The limiting frame 2 has several mounting slots 201, and several electrode terminals 5 are respectively inserted into the several mounting slots 201;

[0031] A plurality of limiting posts 3 are provided, and a plurality of mounting holes 202 are provided on both sides of the limiting frame 2. The plurality of limiting posts 3 are respectively provided in the plurality of mounting holes 202. The power base plate 4 is sleeved between two corresponding limiting posts 3 and connected to the electrode terminal 5.

[0032] And the bearing plate 1, which is fastened to the end face of each limiting post 3 and abuts against the power base plate 4, is used to limit the power base plate 4 to the limiting post 3.

[0033] In the embodiments of this utility model, such as Figure 2As shown, the limiting frame 2 adopts a rectangular structure. In order to install the power base plate 4 in batches, a rectangular structure is preferred. Several mounting holes 202 are opened on both sides of the limiting frame 2, and a limiting post 3 is installed in each mounting hole 202. Through holes are opened at both ends of the power base plate 4. A limiting post 3 is taken on each side of the limiting frame 2 to correspond to the through hole of the power base plate 4, so as to form a positioning and installation structure for the power base plate 4.

[0034] Secondly, the limiting frame 2 also has mounting slots 201 for installing each electrode terminal 5. When installing each electrode terminal 5, by inserting the electrode terminal 5 into the corresponding mounting slot 201, the welding end of the electrode terminal 5 is positioned at the opening of the mounting slot 201, achieving a snap-fit ​​positioning effect. Even when the limiting frame 2 is lifted, moved laterally, or subjected to other transport operations, each electrode terminal 5 can remain stably positioned in its corresponding mounting slot 201. Moreover, the method of sequentially inserting the electrode terminals 5 into the mounting slots 201 not only simplifies the installation process but also optimizes installation accuracy. Furthermore, the welding area of ​​the electrode terminals 5 often undergoes structural changes, such as bending, to meet welding requirements. Therefore, if... Figure 4 As shown, each mounting slot 201 is provided with a foolproof notch 203. The notch 203 ensures that the electrode terminal 5 can only be inserted into the corresponding mounting slot 201 in the correct manner. If the electrode terminal 5 is installed incorrectly, the bending position of the electrode terminal 5 cannot correspond to the notch 203, indicating that the electrode terminal 5 is not installed in the predetermined position and needs to be reinstalled.

[0035] In summary, when welding the power base plate 4 to the electrode terminals 5, the limiting frame 2 is suspended, and each limiting post 3 is installed in the mounting hole 202. To ensure the stability of the installation, the limiting posts 3 can be fixedly connected to the mounting holes 202. The fixing method includes, but is not limited to, welding to ensure that the limiting posts 3 are not easy to loosen. Then, each electrode terminal 5 is inserted into each mounting groove 201 and corresponding to the designated anti-fooling opening 203, so that the electrode terminal 5 is suspended on the limiting frame 2. At the same time, the power base plate 4 is installed between the two limiting posts 3, so that the power base plate 4 is pressed onto each electrode terminal 5 to achieve the docking of the two. Finally, the bearing plate 1 is fastened to the end face of each limiting post 3 to press the power base plate 4 tightly, and the assembled whole is flipped over so that the bearing plate 1 can enter the welding furnace as a bearing structure. Specifically, in order to facilitate the movement of the whole, the bearing plate 1 has two corresponding grooves 103, which provide a handling part for hand force application and ensure stability. After welding, simply remove the limiting frame 2 longitudinally, moving it away from the support plate 1 and separating it from each electrode terminal 5. After separation, the electrode terminals 5 are welded to the power base plate 4, which sits on the support plate 1. The power base plate 4 is essentially in contact with the support plate 1. Therefore, the support plate 1 has several recessed grooves 104 corresponding to several limiting grooves 101. These grooves 104 are recessed into the support plate 1, providing a certain amount of operating space at the end of the support plate 1 corresponding to the power base plate 4, thus facilitating the removal of the power base plate 4. After welding, heat dissipation is a concern. Therefore, the limiting frame 2 has several through grooves 204. These through grooves 204 not only increase the overall permeability of the fixture but also reduce the overall weight of the limiting frame 2, indirectly making the overall weight lighter and easier to handle.

[0036] Specifically, such as Figure 5 As shown, if the bearing plate 1 adopts a flat plate structure, the limiting effect of the bearing plate 1 cannot be effectively guaranteed, and the bearing plate 1 is prone to movement with each limiting post 3. Therefore, the bearing plate 1 is provided with limiting grooves 101 corresponding to several limiting posts 3. The limiting grooves 101 are engaged with the ends of the limiting posts 3, so that when the bearing plate 1 is fastened to the end face of the limiting post 3, the end face of each limiting post 3 is precisely aligned with the limiting groove 101, thus limiting the bearing plate 1 laterally. Even after the entire assembly is flipped over, each limiting post 3 is engaged in the limiting groove 101, ensuring the quality of the welding. In other embodiments, to further ensure the stability of the direct connection between the limiting posts 3 and the bearing plate 1, such as... Figure 6As shown, the end of the limiting post 3 is provided with a first boss 301 and a second boss 302 coaxial with the limiting post 3. Each limiting groove 101 is provided with a limiting hole 102 penetrating the bearing plate 1. The first boss 301 and the second boss 302 are respectively inserted into the power base plate 4 and the limiting hole 102, dividing the limiting post 3 into three parts: the body, the first boss 301, and the second boss 302. The body has the largest diameter, the diameter of the first boss 301 is smaller than the diameter of the body, and the diameter of the second boss 302 is smaller than the diameter of the first boss 301. When the power base plate 4 is installed, the through holes on both sides of the power base plate 4 are installed on the first boss 301. At the same time, the second boss 302 passes through the through holes of the power base plate 4. When the bearing plate 1 is fastened, the limiting hole 102 of the bearing plate 1 is fitted onto the first boss 301. This not only plays a positioning role, but also enhances the connection strength between the bearing plate 1 and the limiting post 3 and the limiting frame 2. At the same time, when the bearing plate 1 serves as the bearing structure of the bottom surface, directly lifting the limiting frame 2 can quickly separate the two, which is convenient for operation.

[0037] In the overall prefabricated design, to facilitate initial assembly or subsequent disassembly, the limiting post 3 can be designed to be quickly installed and disassembled with the limiting frame 2. Specifically, the end of the limiting post 3 away from the first protrusion 301 is provided with an installation rod 303. The installation rod 303 passes through the limiting frame 2 and is fixedly located at its end. The installation rod 303 passes through the mounting hole 202. To ensure strength, the installation rod 303 and the mounting hole 202 are interference-fitted, allowing force to be applied for installation or disassembly. After installation, it can serve as a load-bearing structure for the limiting frame 2. When the limiting frame 2 is flipped over, each installation rod 303 is supported on the table, suspending the limiting frame 2 and facilitating the installation of the electrode terminal 5. However, hammering during installation may damage the structure. Preferably, such as Figure 6 As shown, the mounting rod 303 is a threaded rod with a nut 6 threaded onto it. The nut 6 abuts against the limiting frame 2. The diameter of the limiting post 3 is larger than the diameter of the mounting hole 202. When the mounting rod 303 moves, the nut 6 can quickly fix the limiting post 3 onto the limiting frame 2. Disassembly can be performed later simply by unscrewing the nut 6. Simultaneously, a washer 601, which can be a spring washer, is provided between the nut 6 and the limiting frame 2 to increase the stability of the nut 6 on the mounting rod 303 and prevent it from rotating.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A welding fixture for welding electrode terminals (5) onto a power base plate (4), characterized in that, include: The limiting frame (2) has several mounting slots (201), and several electrode terminals (5) are respectively inserted into several mounting slots (201); A plurality of limiting posts (3) are provided, and a plurality of mounting holes (202) are provided on both sides of the limiting frame (2). The plurality of limiting posts (3) are respectively provided in the plurality of mounting holes (202). The power base plate (4) is sleeved between two corresponding limiting posts (3) and connected to the electrode terminal (5). The bearing plate (1) is fastened to the end face of each of the limiting posts (3) and abuts against the power base plate (4) to limit the power base plate (4) to the limiting posts (3).

2. The welding fixture according to claim 1, characterized in that, The bearing plate (1) has a limiting groove (101) corresponding to a plurality of limiting posts (3), and the limiting groove (101) is engaged with the end of the limiting post (3).

3. A welding fixture according to claim 2, characterized in that, The end of the limiting post (3) is provided with a first boss (301) and a second boss (302) coaxial with the limiting post (3). Each limiting groove (101) is provided with a limiting hole (102) penetrating the bearing plate (1). The first boss (301) and the second boss (302) are respectively inserted into the power base plate (4) and the limiting hole (102).

4. A welding fixture according to claim 3, characterized in that, The limiting post (3) has an installation rod (303) at one end away from the first boss (301), and the installation rod (303) passes through the limiting frame (2).

5. A welding fixture according to claim 4, characterized in that, The mounting rod (303) is a threaded rod, and a nut (6) is threaded onto the threaded rod. The nut (6) abuts against the limiting frame (2).

6. A welding fixture according to claim 5, characterized in that, A washer (601) is provided between the nut (6) and the limiting frame (2).

7. A welding fixture according to any one of claims 2-6, characterized in that, The bearing plate (1) has a plurality of grooves (104) that correspond to a plurality of limiting grooves (101).

8. A welding fixture according to any one of claims 1-6, characterized in that, The limiting frame (2) has several through slots (204).

9. A welding fixture according to any one of claims 1-6, characterized in that, Each of the mounting slots (201) is provided with a foolproof opening (203).

10. A welding fixture according to any one of claims 1-6, characterized in that, The support plate (1) has two corresponding grooves (103).

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