Improved clamp suitable for precise welding of IGBT (Insulated Gate Bipolar Translator) module

Abstract

The utility model provides an improved fixture suitable for precise welding of an IGBT module, which comprises a bottom plate used for placing a substrate, a top plate arranged above the bottom plate, and a guide device connected with the bottom plate and the top plate, two ends of the top plate along the length direction are provided with locking grooves, and locking devices are arranged in the locking grooves; a needle plate assembly and a limiting assembly used for limiting a base plate are arranged between the bottom plate and the top plate. The top plate can move relative to the bottom plate, and the top plate is provided with a first position close to the bottom plate and a second position away from the bottom plate. When the clamp is in an unused state, the top plate is located at a second position far away from the bottom plate, a substrate of the IGBT module can be conveniently placed on the bottom plate, the top plate moves to the first position towards the bottom plate, and locking devices arranged in locking grooves in the two ends of the top plate are automatically or manually activated to firmly fix the top plate at the position.

Description

Technical Field

[0001] This utility model relates to the field of welding fixture technology, and in particular to an improved fixture suitable for precision welding of IGBT modules. Background Technology

[0002] With the rapid development of power electronics technology, IGBT (Insulated Gate Bipolar Transistor) modules, as core components of power electronic devices, have been widely used in electric vehicles, wind power generation, rail transportation, and other fields. The welding quality of IGBT modules directly affects their electrical performance and reliability; therefore, increasingly higher requirements are being placed on the precision welding of IGBT modules.

[0003] Traditional IGBT module welding fixtures have many design shortcomings, such as inaccurate positioning and unstable clamping. These problems often lead to errors in the welding process, affecting welding quality and efficiency. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an improved fixture suitable for precision welding of IGBT modules, which solves the problems of inaccurate positioning and unstable clamping of traditional IGBT module welding fixtures in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides the following technical solution:

[0006] In one embodiment of the present invention, the top plate has locking grooves at both ends along its length, and locking devices are provided in the locking grooves; a pin plate assembly and a limiting assembly for limiting the substrate are provided between the bottom plate and the top plate; the top plate is movable relative to the bottom plate, and the top plate has a first position close to the bottom plate and a second position away from the bottom plate.

[0007] To achieve the above technical solution, when the fixture is not in use, the top plate is located in a second position away from the bottom plate, which facilitates placing the IGBT module substrate on the bottom plate. The top plate moves towards the bottom plate to the first position, and the locking device in the locking grooves at both ends of the top plate is automatically or manually activated to firmly fix the top plate in this position. As the top plate approaches the bottom plate, the limiting component precisely limits the substrate to ensure that the substrate does not move or shift during the welding process. At the same time, the pin plate assembly applies appropriate pressure to the substrate through the terminals to ensure good contact at the welding points. After welding is completed, the locking device unlocks, allowing the top plate to return to the second position, and then the welded IGBT module can be safely removed from the bottom plate.

[0008] In one embodiment of the present invention, the pin plate assembly includes a terminal mounting plate and a first connecting rod with one end fixed to the terminal mounting plate and the other end passing through the top plate; the terminal mounting plate is provided with a plurality of assembly holes for terminal insertion.

[0009] To achieve the above technical solution, the terminal mounting plate is provided with multiple mounting holes. The position and size of these mounting holes are designed to precisely match the terminals on the IGBT module. When the top plate moves from the second position to the first position, the first connecting rod drives the terminal mounting plate and its terminals to gradually approach the substrate. Finally, when the top plate reaches the first position, the corresponding solder points on the terminals and the substrate are precisely aligned. After the solder points on the terminals and the substrate are aligned, the welding equipment starts working, achieving electrical connection by melting the solder between the terminals and the substrate.

[0010] In one embodiment of the present invention, the limiting component includes a fixed frame located at the lower end of the terminal mounting plate, limiting blocks disposed at both ends of the fixed frame, and a second connecting rod with one end fixed to the limiting block and the other end passing through the top plate.

[0011] To achieve the above technical solution, the main function of the fixed frame is to provide a stable support structure for supporting and positioning the substrate of the IGBT module. One end of the second connecting rod is fixed to the limiting block, and the other end is inserted into the top plate. When the top plate moves above the bottom plate, the second connecting rod can extend and retract with the movement of the top plate, thereby driving the limiting block and the fixed frame to move together.

[0012] In one embodiment of the present invention, the guiding device includes a guide post disposed on the base plate and a snap-fit ​​portion disposed on the guide post, wherein a snap-fit ​​groove is provided on the snap-fit ​​portion; when the top plate is in the first position, the locking device can lock with the snap-fit ​​groove to fix the top plate and the base plate in a welded state.

[0013] To achieve the above technical solution, the guide column provides a vertical guide path for the top plate. The snap-fit ​​part is located at the top of the guide column and is designed to work in conjunction with the locking device to fix the top plate and the bottom plate. When the top plate moves to the first position, the locking device aligns with the snap-fit ​​groove on the snap-fit ​​part and locks. This process can be automated or it can be done manually by the operator. After welding is completed, the locking device can release the locking state with the snap-fit ​​groove, allowing the top plate to move freely back to the second position so that the welded IGBT module can be removed.

[0014] In one embodiment of the present invention, the locking device includes two locking plates that are arranged opposite to each other and wedge together, and a rotating pin connecting the locking plates and the locking groove. The locking plates are rotatable relative to the top plate along the rotating pin. When the locking plates are located in the locking groove, the locking plates are engaged in the locking groove. When the locking plates are away from the locking groove, the locking plates are disengaged from the locking groove, causing the top plate to move from the first position to the second position.

[0015] To achieve the above technical solution, the locking plate is connected to the top plate via a rotating pin and can rotate relative to the top plate on the axis of the rotating pin. This design allows the locking plate to engage or disengage from the locking groove when needed. When the top plate moves to the first position, due to the mutual wedging action between the locking plates, they will rotate inward under external force and engage in the locking groove. Once the locking plate is engaged in the locking groove, the fixture will remain locked, ensuring the stability and accuracy of the welding. After welding is completed, the locking device needs to be unlocked so that the top plate can move back to the second position. The locking plates will rotate outward due to the reverse force of the mutual wedging action or the action of a spring or other reset mechanism, and disengage from the locking groove.

[0016] In one embodiment of the present invention, a rotating handle is provided on the locking plate located on the outer side.

[0017] To achieve the above technical solution, after welding is completed, in order to release the top plate, the operator only needs to gently pull and rotate the handle to make the locking plate disengage from the snap-fit ​​groove. Once the locking plate is disengaged from the snap-fit ​​groove, the top plate can be freely moved back to the second position to remove the welded IGBT module.

[0018] In one embodiment of the present invention, a positioning component is included, the positioning component including a plurality of positioning posts passing through the top plate, and a positioning block located at the lower end of the positioning posts and abutting against the bottom plate.

[0019] To achieve the above technical solution, the positioning column is vertically inserted into the top plate, with its lower end extending out of the top plate and connected to the positioning block. The positioning block is designed to fit tightly against the surface of the bottom plate. When the top plate moves to the first position, the positioning block will contact the bottom plate, thereby fixing the relative position between the top plate and the bottom plate.

[0020] As described above, the improved fixture of this utility model for precision welding of IGBT modules has the following advantages: by designing a precise guiding device and limiting components, the stability and accuracy of the top plate during movement and the precise positioning of the substrate during welding are ensured; the design of the locking device enables the top plate to be firmly fixed in the predetermined position during welding, preventing movement or displacement caused by vibration or other external factors; the pin plate assembly applies appropriate pressure to the substrate through the terminals, ensuring good contact at the welding points and improving the quality of the welding points. Attached Figure Description

[0021] Figure 1 The diagram shown is a structural schematic of this utility model.

[0022] Figure 2 This is a schematic diagram showing the exploded state of this utility model.

[0023] Figure 3 The diagram shown is a structural schematic of the locking device.

[0024] Component designation explanation

[0025] 1. Base plate; 2. Top plate; 3. Guide device; 4. Locking groove; 5. Locking device; 6. Terminal mounting plate; 7. First connecting rod; 8. Assembly hole; 9. Fixing frame; 10. Limiting block; 11. Second connecting rod; 31. Guide post; 32. Snap-fit ​​part; 33. Snap-fit ​​groove; 41. Locking plate; 42. Rotating pin; 43. Rotating handle; 12. Positioning post; 13. Positioning block. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Please see Figures 1 to 3 This utility model provides an improved fixture suitable for precision welding of IGBT modules, including a base plate 1 for placing a substrate, a top plate 2 disposed above the base plate 1, and a guide device 3 connecting the base plate 1 and the top plate 2. The top plate 2 has locking grooves 4 at both ends along its length, and locking devices 5 are provided in the locking grooves 4. A pin plate assembly and a limiting assembly for limiting the substrate are provided between the base plate 1 and the top plate 2. The top plate 2 is movable relative to the base plate 1, and the top plate 2 has a first position close to the base plate 1 and a second position away from the base plate 1.

[0028] When the fixture is not in use, the top plate 2 is in a second position away from the bottom plate 1, which facilitates placing the IGBT module substrate on the bottom plate 1. The top plate 2 moves towards the bottom plate 1 to the first position, and the locking device 5, which is provided in the locking groove 4 at both ends of the top plate 2, is automatically or manually activated to firmly fix the top plate 2 in this position. As the top plate 2 approaches the bottom plate 1, the limiting component precisely limits the substrate to ensure that the substrate will not move or shift during the welding process. At the same time, the pin plate assembly applies appropriate pressure to the substrate through the terminals to ensure good contact at the welding points. After welding is completed, the locking device 5 unlocks and the top plate 2 returns to the second position, and then the welded IGBT module can be safely removed from the bottom plate 1.

[0029] The pin plate assembly includes a terminal mounting plate 6 and a first connecting rod 7, one end of which is fixed to the terminal mounting plate 6 and the other end of which passes through the top plate 2. The terminal mounting plate 6 has multiple mounting holes 8 for terminal insertion. The positions and dimensions of these mounting holes 8 are designed to precisely match the terminals on the IGBT module. When the top plate 2 moves from the second position to the first position, the first connecting rod 7 drives the terminal mounting plate 6 and its terminals to gradually approach the substrate. Finally, when the top plate 2 reaches the first position, the corresponding solder points on the substrate are precisely aligned with the terminals. After the solder points on the substrate are aligned, the welding equipment starts working, achieving electrical connection by melting the solder between the terminals and the substrate.

[0030] The limiting component includes a fixing frame 9 located at the lower end of the terminal mounting plate 6, limiting blocks 10 disposed at both ends of the fixing frame 9, and a second connecting rod 11 with one end fixed to the limiting block 10 and the other end passing through the top plate 2.

[0031] The main function of the fixed frame 9 is to provide a stable support structure for supporting and positioning the substrate of the IGBT module. One end of the second connecting rod 11 is fixed on the limiting block 10, and the other end is inserted through the top plate 2. When the top plate 2 moves above the bottom plate 1, the second connecting rod 11 can extend and retract with the movement of the top plate 2, thereby driving the limiting block 10 and the fixed frame 9 to move together.

[0032] The guiding device 3 includes a guide post 31 disposed on the base plate 1 and a snap-fit ​​part 32 disposed on the guide post 31. The snap-fit ​​part 32 is provided with a snap-fit ​​groove 33. When the top plate 2 is in the first position, the locking device 5 can lock with the snap-fit ​​groove 33 to fix the top plate 2 and the base plate 1 in a welded state.

[0033] The guide post 31 provides a vertical guide path for the top plate 2. The snap-fit ​​part 32 is located at the top of the guide post 31. It is designed to work in conjunction with the locking device 5 to fix the top plate 2 and the bottom plate 1. When the top plate 2 moves to the first position, the locking device 5 will align with the snap-fit ​​groove 33 on the snap-fit ​​part 32 and lock. This process can be automated or it can be done manually by the operator. After welding is completed, the locking device 5 can release the locking state with the snap-fit ​​groove 33, so that the top plate 2 can move freely back to the second position to facilitate the removal of the welded IGBT module.

[0034] The locking device 5 includes two locking plates 41 that are arranged opposite to each other and wedge together, and a rotating pin 42 connecting the locking plates 41 and the locking groove 4. The locking plates 41 can rotate relative to the top plate 2 along the rotating pin 42. When the locking plates 41 are in the locking groove 4, the locking plates 41 are engaged in the locking groove 33. When the locking plates 41 are away from the locking groove 4, the locking plates 41 are disengaged from the locking groove 33, so that the top plate 2 moves from the first position to the second position.

[0035] The locking plate 41 is connected to the top plate 2 via a rotating pin 42 and can rotate relative to the top plate 2 on the axis of the rotating pin 42. This design allows the locking plate 41 to engage or disengage from the locking groove 33 when needed. When the top plate 2 moves to the first position, due to the mutual wedging action between the locking plates 41, they will rotate inward under external force and engage in the locking groove 33. Once the locking plate 41 is engaged in the locking groove 33, the fixture will remain locked, ensuring the stability and accuracy of the welding. After welding is completed, the locking device 5 needs to be unlocked so that the top plate 2 can move back to the second position. The locking plate 41 will rotate outward due to the reverse force of the mutual wedging action or the action of a spring or other reset mechanism, and disengage from the locking groove 33.

[0036] The locking plate 41 located on the outer side is provided with a rotating handle 43. After welding is completed, in order to release the top plate 2, the operator only needs to gently pull the rotating handle 43 to disengage the locking plate 41 from the snap-fit ​​groove 33. Once the locking plate 41 is disengaged from the snap-fit ​​groove 33, the top plate 2 can be freely moved back to the second position to remove the welded IGBT module.

[0037] The system includes a positioning assembly comprising a plurality of positioning posts 12 passing through the top plate 2, and a positioning block 13 located at the lower end of the positioning posts 12 and abutting against the bottom plate 1. The positioning posts 12 are vertically inserted into the top plate 2, with their lower ends extending out of the top plate 2 and connected to the positioning block 13. The positioning block 13 is designed to fit tightly against the surface of the bottom plate 1. When the top plate 2 moves to a first position, the positioning block 13 contacts the bottom plate 1, thereby fixing the relative position between the top plate 2 and the bottom plate 1.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An improved jig suitable for precision welding of IGBT modules, comprising a base plate for placing a substrate, a top plate disposed above the base plate, a guide means connecting the base plate and the top plate, characterized in that: The top plate is provided with a locking groove at both ends along the length direction, and the locking groove is provided with a locking device; The bottom plate and the top plate are provided with a needle plate assembly and a limiting assembly for limiting the substrate; The top plate can move relative to the bottom plate, and the top plate has a first position close to the bottom plate and a second position away from the bottom plate.

2. The improved fixture for precision welding of IGBT modules according to claim 1, wherein: The needle plate assembly comprises a terminal mounting plate and a first connecting rod fixed at one end of the terminal mounting plate and penetrating the top plate at the other end; The terminal mounting plate is provided with a plurality of assembly holes for terminal insertion.

3. The improved fixture for precision welding of IGBT modules according to claim 2, wherein: The limiting assembly comprises a fixed frame at the lower end of the terminal mounting plate, limiting blocks arranged at both ends of the fixed frame, and a second connecting rod fixed at one end of the limiting block and penetrating the top plate at the other end.

4. The improved fixture for precision welding of IGBT modules of claim 1, wherein: The guide device comprises a guide column arranged on the bottom plate and a clamping portion arranged on the guide column, and the clamping portion is provided with a clamping groove; When the top plate is in the first position, the locking device can be locked with the clamping groove to fix the top plate and the bottom plate in a welding state.

5. The improved fixture for precision welding of IGBT modules according to claim 4, wherein: The locking device comprises two locking plates arranged opposite to each other and wedged with each other, a rotating pin connecting the locking plates and the locking groove, and the locking plates can rotate relative to the top plate along the rotating pin; When the locking plate is in the locking groove, the locking plate is clamped in the clamping groove, and when the locking plate is away from the locking groove, the locking plate is out of the clamping groove, so that the top plate moves from the first position to the second position.

6. The improved fixture for precision welding of IGBT modules of claim 5, wherein: The locking plate on the outer side is provided with a rotating handle.

7. The improved fixture for precision welding of IGBT modules of claim 1, wherein: The positioning assembly comprises a plurality of positioning columns penetrating the top plate and a positioning block at the lower end of the positioning column and abutting against the bottom plate. ​

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