Positioning tool for welding semiconductor shunt disc

Abstract

The invention relates to the technical field of welding tools, in particular to a positioning tool for semiconductor shunt disc welding. Comprising a diffusion welding box, a base arranged at the bottom end of the interior of the diffusion welding box, a lifting placement plate arranged above the base and used for stacking shunting discs, four sets of clamping blocks symmetrically distributed on the periphery of the base, a centering power piece used for driving the clamping blocks to synchronously move towards the center, and a pressing piece arranged above the clamping blocks. The pressing piece comprises a fixing disc used for pressing the flow dividing disc downwards and an extrusion rod arranged in a sliding mode, the bottom of the extrusion rod is provided with an inclined face structure matched with the guide inclined face of the top of the clamping block, and when the pressing piece moves downwards, downward pressing force is converted into pushing force in the horizontal direction, so that the clamping block is driven to be further tightly attached to the periphery of the flow dividing disc. Fine centering and positioning of the flow dividing disc are achieved. The positioning error generated by the transmission mechanism can be effectively compensated, the positioning concentricity and the positioning stability of the shunting disc are improved, and therefore the stability of the diffusion welding process and the product quality are improved.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, and in particular to a positioning fixture for welding semiconductor shunts. Background Technology

[0002] In the manufacturing of metal cutting and welding equipment such as automatic and semi-automatic electric arc and plasma arc welding machines, as well as the construction of intelligent casting islands, high-power semiconductor shunts are core components supporting the power conversion and current distribution of the entire machine. To ensure the electrical continuity and thermal stability of the shunts under extreme welding conditions, multiple layers of dissimilar metals are typically stacked and subjected to diffusion welding.

[0003] Existing automated tooling suffers from the following unavoidable drawbacks:

[0004] Most existing positioning fixtures use a "drive motor + bidirectional lead screw" or cylinder-driven clamping mechanism to clamp and position the distributor plate from different directions using multiple clamping components. However, in industrial environments, transmission components such as lead screw pairs, chain drive mechanisms, and guide rail sliders are prone to mechanical wear, resulting in backlash or accumulated tolerances. This causes deviations in the clamping components during positioning, affecting the concentricity of the distributor plate and reducing the stability of diffusion welding.

[0005] Furthermore, since diffusion welding is typically performed at higher temperatures, the distributor plate will experience a certain degree of radial thermal expansion during the heating process. If radial rigid clamping is maintained throughout the welding process, it can easily generate additional constraint forces on the distributor plate, thereby creating thermal stress at the welding interface and affecting the welding quality. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a positioning fixture for welding semiconductor shunt plates, which solves the problem of cumulative error caused by long-term operation of mechanical structures such as lead screw drives.

[0007] To achieve the above objectives, the present invention provides a positioning fixture for semiconductor shunt pad welding, comprising:

[0008] A diffusion welding box, with a base at its bottom;

[0009] A lifting placement plate is set above the base for stacking distribution plates;

[0010] Four sets of clamping blocks are symmetrically distributed around the base. Each clamping block includes a clamping body, and the top of the clamping body is provided with a guide slope.

[0011] A centering power component is used to drive the four sets of clamping blocks to move synchronously towards the center, so as to initially center the diverter plate; and

[0012] A pressing component is disposed above the clamping block and is driven to move up and down by a hydraulic rod disposed inside the diffusion welding box; the pressing component includes a fixed plate for pressing down the diverter plate and a slidably disposed extrusion rod;

[0013] The bottom of the extrusion rod has an inclined surface adapted to the guide slope. When the pressing component moves downward, the extrusion rod first abuts against the guide slope, converting the downward pressing force into a horizontal thrust, driving the clamping body to further adhere to the outer periphery of the distribution plate to achieve precise centering. As the pressing component continues to move downward, the extrusion rod can be displaced relative to the clamping block and automatically disengage from the guide slope, causing the clamping block to automatically release its grip on the distribution plate.

[0014] The fixed plate then contacts the top of the distribution plate and applies an axial pressing force to the distribution plate.

[0015] Furthermore, the centering power component includes a longitudinal centering component and a transverse centering component respectively disposed on both longitudinal and transverse sides of the base;

[0016] The longitudinal centering component includes two sets of ear plates, and a bidirectional lead screw is rotatably provided between the two sets of ear plates. The opposite external threads at both ends of the bidirectional lead screw are respectively screwed to the two sets of clamping blocks in the longitudinal direction. The base is provided with a drive motor and a drive wheel. The end of the bidirectional lead screw is provided with a driven wheel. The drive wheel drives the driven wheel to rotate synchronously through a chain belt. The internal structure of the transverse centering component is the same as that of the longitudinal centering component.

[0017] Furthermore, the lifting and placing plate has sliding grooves on its four sides; the clamping block also includes a moving rod and a slide rod slidably connected to the moving rod, the moving rod has a threaded hole for screwing to the bidirectional lead screw, and both sides are fitted and limited to fit against the inner wall of the sliding groove; one end of the slide rod is provided with an end cap, and the other end is connected to the clamping body, and a first spring sleeved on the slide rod is connected between the end cap and the moving rod.

[0018] Furthermore, the pressing component also includes a rotating ring rotatably disposed on the outer periphery of the fixed disk, the bottom of the rotating ring having a device groove corresponding to the position of the clamping block, the pressing rod being slidably disposed in the device groove; a second spring is disposed in the device groove to abut against the pressing rod, the elastic force of the second spring being greater than that of the first spring.

[0019] Furthermore, a rack is connected to the extrusion rod, a small gear that meshes with the rack is rotatably provided at the bottom of the rotating ring, a large gear that is coaxially linked with the small gear is rotatably provided at the top of the rotating ring, and a fixing gear ring is fixed at the top of the fixed plate.

[0020] When the rack meshes with the pinion, the pinion rotates, causing the large gear to move along the fixed gear ring, which in turn causes the rotating ring to rotate and moves the pressing rod, causing the pressing rod to disengage from the clamping body.

[0021] Furthermore, a smooth straight rod is provided at one end of the rack near the pinion; in the initial stage when the extrusion rod moves downward and away from the diverter plate, the smooth straight rod and the pinion plate do not form a transmission relationship, and the counter-thrust force generated by the compression of the second spring further drives the clamping body to press tightly against the diverter plate; when the extrusion rod continues to move until the rack meshes with the pinion plate, the force of the clamping body on the diverter plate is released.

[0022] Furthermore, the distance between the extrusion rod and the center of the fixed plate is adjustable; an adjustment rod is inserted into the equipment slot, and an intermediate block and an end block with their outer peripheries fitting against the inner wall of the equipment slot are rotatably sleeved on the adjustment rod. The outer surface of the adjustment rod between the intermediate block and the end block is a smooth section, and a slider fixed to the extrusion rod is slidably sleeved on the smooth section.

[0023] Furthermore, a rotating cap is fixed to one end of the adjusting rod located on the outside, and the surface of the adjusting rod is provided with an external thread that is screwed into the groove wall of the equipment; a synchronizing element is also provided at the bottom of the rotating ring, the synchronizing element includes a bevel gear, and a helical gear that meshes with the bevel gear is fixed to the outer periphery of the rotating cap to achieve synchronous adjustment.

[0024] Furthermore, the top of the rotating ring is also provided with a reset component; the reset component includes an annular groove formed on the top of the rotating ring, a rotating ring plate rotatably provided on the top of the inner wall of the diffusion welding box, an elastic telescopic rod fixed at the bottom of the rotating ring plate, and an adapter plate adapted to the annular groove fixed at the bottom of the elastic telescopic rod; a drive tooth is sleeved on the outer periphery of the rotating ring plate, an outer toothed ring meshing with the drive tooth is provided on the top of the diffusion welding box, and a servo motor for driving the outer toothed ring to rotate;

[0025] In the initial state where the hydraulic rod drives the rotating ring to move downward, the adapter plate is located at the end of the ring groove; when the diffusion welding process ends and the hydraulic rod drives the rotating ring to move upward and reset, the servo motor drives the external toothed ring to rotate, causing the rotating ring plate to rotate at least two revolutions, so that the adapter plate slides into the ring groove and drives the rotating ring to rotate through the end of the ring groove, thereby realizing the position reset of the extrusion rod.

[0026] Furthermore, an electric drive telescopic rod is provided at each of the four internal corners of the base, and the output end of the electric drive telescopic rod passes upward through the top of the base and is fixed to the bottom of the lifting and placing plate; the side of the clamping body away from the diverter plate is provided with an arc surface.

[0027] The beneficial effects of this invention are as follows: By setting a centering power component to drive four sets of clamping blocks to perform initial centering of the distribution plate, and by utilizing the guide inclined surface cooperation between the extrusion rod and the clamping block, the vertical force generated by the pressing of the pressing component is converted into a horizontal thrust, so that the clamping block is further pressed against the outer periphery of the distribution plate, thereby achieving precise centering positioning of the distribution plate. This can effectively compensate for the gap error generated during the lead screw transmission process and improve the positioning concentricity and positioning stability of the distribution plate.

[0028] This invention utilizes a sloped force-transmitting structure between the extrusion rod and the clamping block to achieve precise centering of the distribution plate during the positioning stage. During the pressure welding stage, the extrusion rod automatically disengages from the clamping block, releasing the radial constraint on the distribution plate and allowing for slight free expansion during welding. This structural design matches the positioning structure to the requirements of the diffusion welding process, ensuring high-precision positioning while reducing thermal stress during welding, thus improving the bonding quality of the diffusion weld interface and overall process stability. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall front sectional view of an embodiment of the present invention;

[0031] Figure 2 This is a first-view structural diagram of the clamping member according to an embodiment of the present invention;

[0032] Figure 3 This is a top view of the lifting and placing plate structure according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the centering power component structure according to an embodiment of the present invention;

[0034] Figure 5 Embodiments of the present invention Figure 4 A magnified structural diagram of A in the middle;

[0035] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the base according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the clamping block structure according to an embodiment of the present invention;

[0037] Figure 8This is a first-view structural diagram of the press-fit component according to an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of the second-view structure of the press-fit component according to an embodiment of the present invention;

[0039] Figure 10 Embodiments of the present invention Figure 9 A magnified structural diagram of B in the diagram;

[0040] Figure 11 This is a schematic cross-sectional view of the internal structure of the equipment slot according to an embodiment of the present invention;

[0041] Figure 12 This is a schematic diagram of the reset component structure according to an embodiment of the present invention;

[0042] Figure 13 This is a schematic diagram of the internal structure of the elastic telescopic rod according to an embodiment of the present invention;

[0043] Figure 14 This is a schematic diagram of the overall three-dimensional structure of an embodiment of the present invention.

[0044] The diagram is marked as follows:

[0045] 1. Diffusion welding box; 11. Dust cover; 2. Clamping component; 21. Base; 22. Lifting and placing plate; 221. Sliding groove; 222. Electrically driven telescopic rod; 23. Clamping block; 231. Moving rod; 232. Threaded hole; 233. Slide rod; 234. Clamping body; 2341. Guide slope; 2342. Arc surface; 235. End cap; 236. First spring; 24. Centering power component; 241. Longitudinal centering component; 2411. Ear plate; 2412. Bidirectional lead screw; 2413. Driven transmission wheel; 2414. Driven transmission wheel; 2415. Chain belt; 242. Lateral centering component; 43. Drive motor 3. Pressing component; 31. Fixed plate; 32. Rotating ring; 321. Equipment slot; 4. Diverter plate; 5. Hydraulic rod; 6. Extrusion rod; 61. Second spring; 62. Adjusting rod; 621. Intermediate block; 622. End block; 623. Slider; 624. Rotating cap; 63. Synchronizing component; 631. Helical gear; 632. Bevel gear; 64. Rack; 65. Pinion; 66. Gear; 67. Fixed gear ring; 68. Reset component; 681. Ring groove; 682. Rotating ring plate; 6831. Adapter plate; 683. Elastic telescopic rod; 684. Drive gear; 685. External gear ring; 686. Servo motor. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0047] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] Example 1:

[0049] like Figures 1 to 14 As shown, this embodiment provides a positioning fixture for semiconductor shunt plate welding, including a diffusion welding box 1. A dust cover 11 is provided on the top of the diffusion welding box 1 to seal and protect the power source structure on top of the diffusion welding box 1. In practical applications, since diffusion welding processes are typically performed in high-temperature and vacuum environments, to ensure the vacuum level and thermal stability inside the diffusion welding box 1, all transmission parts connected to the external mechanisms of the diffusion welding box 1 in this positioning fixture adopt a sealed connection structure to ensure internal stability.

[0050] The bottom of the diffusion welding box 1 is equipped with a clamping component 2, including a base 21. A lifting placement plate 22 is provided on the top of the base 21, and the flow distribution plate 4 is stacked at the center of the lifting placement plate 22. Clamping blocks 23 are symmetrically arranged around the base 21 for positioning and clamping the flow distribution plate 4 from four directions.

[0051] The lifting and placing plate 22 has sliding grooves 221 on each of its four sides. The clamping blocks 23 can slide radially along the sliding grooves 221 to clamp and release the distribution plate 4. A centering power component 24 is provided on the top of the base 21 to drive the four sets of clamping blocks 23 to move synchronously toward the center. The centering power component 24 enables multiple clamping blocks 23 to move synchronously, thereby achieving the initial centering and positioning of the distribution plate 4.

[0052] The centering power component 24 includes a longitudinal centering component 241 and a transverse centering component 242. The longitudinal centering component 241 is used to drive the two clamping blocks 23 in the longitudinal direction to move towards the center, and the transverse centering component 242 is used to drive the two clamping blocks 23 in the transverse direction to move towards the center.

[0053] The longitudinal centering component 241 includes two sets of lugs 2411 fixed on both sides of the longitudinal direction of the base 21. A bidirectional lead screw 2412 is rotatably mounted between the two sets of lugs 2411. The bidirectional lead screw 2412 has external threads with opposite directions of rotation and is threadedly connected to the moving rods 231 in the two longitudinal clamping blocks 23. A driven transmission wheel 2413 is rotatably mounted on one set of lugs 2411. The driven transmission wheel 2413 is fixedly connected to one end of the bidirectional lead screw 2412 and can rotate synchronously.

[0054] A drive wheel 2414 is provided on the side of the base 21, and a drive motor 43 is provided inside the base 21. The drive motor 43 is used to drive the drive wheel 2414 to rotate. The drive wheel 2414 and the driven wheel 2413 are connected by a chain belt 2415 to form a chain drive structure.

[0055] When the drive motor 43 starts, the drive motor 43 drives the active transmission wheel 2414 to rotate, which in turn drives the driven transmission wheel 2413 to rotate via the chain belt 2415, thereby driving the bidirectional lead screw 2412 to rotate, causing the two longitudinal clamping blocks 23 to move closer or further apart.

[0056] The structure of the transverse centering component 242 is the same as that of the longitudinal centering component 241. It is arranged on both sides of the transverse side of the base 21 and is used to drive the two transverse clamping blocks 23 to move synchronously toward or away from the center.

[0057] By simultaneously driving the longitudinal centering component 241 and the transverse centering component 242, the four clamping blocks 23 can be moved closer to the distribution plate 4 synchronously, thereby initially centering and positioning the distribution plate 4. It should be noted that the centering power component 24 driving the clamping blocks 23 to move is the initial centering process. In this stage, each clamping block 23 is mainly used to push the distribution plate 4 from the off-center position to the center area, and will not immediately form a completely tight clamping state.

[0058] Therefore, after the initial centering stage, a certain small gap is maintained between the clamping body 234 and the diverter plate 4, allowing each clamping body 234 to still have space to continue moving towards the diverter plate 4. This allows the clamping body 234 to be further pushed towards the diverter plate 4 by the guide slope 2341 during the subsequent pressing of the extrusion rod 6, thereby achieving more accurate centering positioning.

[0059] The clamping block 23 includes a moving rod 231, a sliding rod 233, a clamping body 234, an end cap 235, and a first spring 236. The moving rod 231 has a threaded hole 232, which is threadedly connected to a two-way lead screw 2412. Both sides of the moving rod 231 are in contact with the inner wall of the sliding groove 221, thereby limiting the movement of the moving rod 231 and preventing it from rotating.

[0060] A sliding rod 233 is slidably connected to the moving rod 231. One end of the sliding rod 233 is provided with an end cap 235, and the other end is connected to the clamping body 234. The bottom of the clamping body 234 overlaps the top of the base 21, and the side of the clamping body 234 fits against the sliding groove 221.

[0061] A first spring 236 is provided between the end cap 235 and the moving rod 231. One end of the first spring 236 is connected to the end cap 235, and the other end is connected to the moving rod 231. The first spring 236 is sleeved on the outside of the slide rod 233. The first spring 236 provides elastic cushioning for the clamping body 234, allowing the clamping body 234 to have a certain elastic stroke when contacting the diverter plate 4, thereby avoiding rigid collision. Furthermore, when the first spring 236 is in its natural state, a certain small gap is maintained between the end cap 235 and the moving rod 231, allowing a small movement stroke between the clamping body 234 and the moving rod 231, thereby enabling the clamping body 234 to undergo elastic deformation when contacting the outer periphery of the diverter plate 4.

[0062] With this structural design, when the clamping body 234 contacts the outer periphery of the diverter plate 4, the first spring 236 can generate a certain buffering effect, so that the clamping body 234 and the diverter plate 4 form an elastic contact, thereby reducing the impact generated by the rigid contact.

[0063] The top of the clamping body 234 is provided with a guide slope 2341, and the side away from the diverter plate 4 is provided with an arc surface 2342.

[0064] A pressing component 3 is provided above the clamping block 23, and a hydraulic rod 5 is provided on the top of the diffusion welding box 1. The hydraulic rod 5 is used to drive the pressing component 3 to move up and down.

[0065] The pressing component 3 includes a fixed disk 31, which is fixedly connected to the bottom end of the hydraulic rod 5 and is used to press down the stacked distribution disks 4. The axis of the fixed disk 31 coincides with the axis of the lifting and placing plate 22. A rotating ring 32 is rotatably provided on the outer periphery of the fixed disk 31 via bearings.

[0066] The bottom of the rotating ring 32 is provided with a device groove 321, which corresponds to the position of the clamping block 23. A pressing rod 6 is slidably arranged in the device groove 321. The bottom of the pressing rod 6 is provided with an inclined surface that matches the guide inclined surface 2341. A second spring 61 is provided inside the device groove 321. The elastic force of the second spring 61 is greater than that of the first spring 236.

[0067] In use, after the clamping block 23 completes the initial centering and positioning of the distribution plate 4, the hydraulic rod 5 drives the pressing component 3 to move downward, so that the pressing rod 6 first contacts the clamping body 234. Under the action of the guide inclined surface 2341, the downward pressure of the pressing rod 6 is converted into a horizontal thrust, thereby pushing the clamping body 234 towards the distribution plate 4, so that the clamping body 234 is further pressed against the outer periphery of the distribution plate 4.

[0068] This structure enables secondary fine centering and positioning of the flow divider 4, thereby compensating for the gap error that may occur during the screw drive process, further improving the concentricity of the flow divider 4, and enhancing the bonding accuracy of the welding interface during diffusion welding.

[0069] After the clamping body 234 is fully attached to the outer periphery of the diverter plate 4, the extrusion rod 6 continues to move downward. At this time, the second spring 61 is compressed, and the extrusion rod 6 moves away from the diverter plate 4 under the action of elastic force.

[0070] Example 2:

[0071] Based on Example 1, in order to automatically release the clamp after welding, a rack 64 is connected to the extrusion rod 6, and a pinion 65 is rotatably arranged at the bottom of the rotating ring 32, which can mesh with the rack 64. A large gear 66 is rotatably arranged at the top of the rotating ring 32, and the large gear 66 is coaxial with the pinion 65.

[0072] A fixed gear ring 67 is fixedly installed on the top of the fixed disk 31, and the large gear 66 can move along the fixed gear ring 67.

[0073] A smooth straight rod is provided at one end of the rack 64 near the pinion 65.

[0074] When the extrusion rod 6 moves downward and away from the diverter plate 4, the smooth straight rod and the pinion 65 will not form a transmission relationship at first. At this time, the counter-thrust generated by the compression of the second spring 61 will further push the clamping body 234 to fit tightly against the outer periphery of the diverter plate 4, thereby further enhancing the effect of fine clamping and centering.

[0075] When the pressing rod 6 continues to move until the rack 64 meshes with the pinion 65, the pinion 65 starts to rotate and drives the large gear 66 to rotate synchronously. The large gear 66 moves along the fixed gear ring 67, thereby driving the rotating ring 32 to generate. The reset resistance of the large gear 66 is set to be greater than the elastic force of the second spring 61. Specifically, a friction pad or damping washer is set on the rotating shaft of the large gear 66 so that a certain frictional resistance is generated when the gear rotates, thereby forming a reset resistance.

[0076] After the rotating ring 32 rotates, it will cause the extrusion rod 6 to gradually deviate from the clamping body 234, thereby disengaging the extrusion rod 6 from the clamping body 234 and relieving the force of the clamping body 234 on the diverting plate 4.

[0077] After the clamping body 234 releases its clamping effect on the diverter plate 4, the diverter plate 4 is no longer constrained by the clamping block 23 in the radial direction. At this time, only the fixed plate 31 applies axial pressing force to the diverter plate 4 for diffusion welding. Through this structural design, the clamping block 23 only plays a role in the centering and positioning stage, and automatically exits the stress state in the pressing and welding stage.

[0078] Since diffusion welding is usually carried out at a high temperature, the flow divider 4 will generate a certain degree of thermal expansion during the heating process. When the clamping block 23 releases the clamp in advance, the flow divider 4 can undergo a small amount of free expansion in the radial direction.

[0079] Subsequently, the fixed plate 31 continues to press down to the top of the diverter plate 4, stabilizing the diverter plate 4.

[0080] Example 3:

[0081] Based on Embodiment 1 or Embodiment 2, in order to adapt to the positioning requirements of different sized diversion plates 4, an adjustment structure is provided inside the equipment slot 321.

[0082] Specifically, an adjusting rod 62 is inserted into the equipment slot 321, and an intermediate block 621 is rotatably sleeved on the outer periphery of the adjusting rod 62. An end block 622 is rotatably disposed at the inner end of the adjusting rod 62 located in the equipment slot 321. The outer peripheries of the intermediate block 621 and the end block 622 are respectively attached to the inner wall of the equipment slot 321.

[0083] The portion of the adjusting rod 62 between the intermediate block 621 and the end block 622 is a smooth section. A slider 623 is slidably mounted on this smooth section, and the slider 623 is fixedly connected to the extrusion rod 6. At the same time, the second spring 61 is mounted on this smooth section, with one end connected to the intermediate block 621 and the other end connected to the extrusion rod 6.

[0084] One end of the adjusting rod 62 extends out of the equipment slot 321 and is fixedly fitted with a rotating cap 624. The portion of the adjusting rod 62 located between the rotating cap 624 and the intermediate block 621 is provided with an external thread, which is threadedly connected to the slot wall of the equipment slot 321.

[0085] By rotating the rotating cap 624, the adjusting rod 62 can move axially within the equipment slot 321, thereby changing the distance between the extrusion rod 6 and the center of the fixed plate 31, so that the extrusion rod 6 can be adapted to the diverter plate 4 of different sizes.

[0086] A synchronizing element 63 is rotatably mounted at the bottom of the rotating ring 32. The synchronizing element 63 includes a bevel gear 632, and a helical gear 631 that meshes with the bevel gear 632 is fixedly mounted on the outer periphery of the rotating cap 624. When the worker rotates any rotating cap 624, the meshing transmission between the helical gear 631 and the bevel gear 632 can make multiple rotating caps 624 rotate synchronously, thereby realizing the synchronous adjustment of the positions of multiple extrusion rods 6.

[0087] Example 4:

[0088] Based on the above embodiment, an electric drive telescopic rod 222 is provided at each of the four corners inside the base 21. The output end of the electric drive telescopic rod 222 passes through the top of the base 21 and is fixedly connected to the bottom of the lifting and placing plate 22.

[0089] By adjusting the extension length of the electric drive telescopic rod 222, the height of the lifting placement plate 22 can be changed, thereby changing the height of the clamping block 23 exposed relative to the lifting placement plate 22, so as to adapt to the distribution plate 4 with different stacking heights.

[0090] Example 5:

[0091] Based on the above embodiment, a reset member 68 is provided at the top of the rotating ring 32. The reset member 68 includes an annular groove 681 formed at the top of the rotating ring 32.

[0092] A rotating ring plate 682 is rotatably installed at the top of the inner wall of the diffusion welding box 1. An elastic telescopic rod 683 is fixedly installed at the bottom of the rotating ring plate 682. An adapter plate 6831 is fixedly installed at the bottom of the elastic telescopic rod 683. The adapter plate 6831 is adapted to the ring groove 681.

[0093] An external toothed ring 685 is fitted around the outer periphery of the rotating ring plate 682, and a drive tooth 684 is provided on the top of the diffusion welding box 1. The external toothed ring 685 meshes with the drive tooth 684, and a servo motor 686 is provided on the top of the diffusion welding box 1 to drive the drive tooth 684 to rotate.

[0094] After the diffusion welding process is completed, the hydraulic rod 5 moves upward and resets. At this time, the servo motor 686 drives the external gear ring 685 to rotate, which in turn drives the rotating ring plate 682 to rotate. After the rotating ring plate 682 rotates at least two revolutions, the adapter plate 6831 enters the ring groove 681 and drives the rotating ring 32 to rotate through one end of the ring groove 681, thereby restoring the extrusion rod 6 to its initial position and realizing the reset of the entire mechanism.

[0095] Through the above structural design, the present invention can realize automatic centering and positioning, precise clamping and automatic reset of the flow divider plate 4, thereby effectively reducing the positioning deviation caused by the cumulative error of the transmission mechanism and improving the stability of the diffusion welding process and product quality.

[0096] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0097] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A positioning fixture for welding semiconductor shunt pads, characterized in that, include: A diffusion welding box (1) has a base (21) at its bottom. A lifting placement plate (22) is set above the base (21) for stacking the diversion plate (4); Four sets of clamping blocks (23) are symmetrically distributed around the base (21). Each clamping block (23) includes a clamping body (234), and the top of the clamping body (234) is provided with a guide slope (2341). The centering power component (24) is used to drive the four sets of clamping blocks (23) to move synchronously toward the center in order to perform initial centering of the diversion disk (4); as well as The pressing component (3) is positioned above the clamping block (23) and is driven to rise and fall by a hydraulic rod (5) located in the diffusion welding box (1); the pressing component (3) includes a fixed plate (31) for pressing down the diverter plate (4) and a slidably disposed extrusion rod (6). The bottom of the extrusion rod (6) has an inclined surface that is adapted to the guide inclined surface (2341); when the pressing member (3) moves down, the extrusion rod (6) first abuts against the guide inclined surface (2341), converting the downward pressing force into a horizontal thrust, driving the clamping body (234) to further adhere to the outer periphery of the diverter plate (4) to achieve precise centering; as the pressing member (3) continues to move down, the extrusion rod (6) can be displaced relative to the clamping block (23) and automatically disengage from the guide inclined surface (2341), so that the clamping block (23) automatically releases its clamping of the diverter plate (4); The fixed plate (31) then contacts the top of the diverter plate (4) and applies an axial pressing force to the diverter plate (4).

2. The positioning fixture for semiconductor shunt plate welding according to claim 1, characterized in that, The centering power component (24) includes a longitudinal centering component (241) and a transverse centering component (242) respectively disposed on the longitudinal and transverse sides of the base (21). The longitudinal centering component (241) includes two sets of ear plates (2411), and a bidirectional lead screw (2412) is rotatably provided between the two sets of ear plates (2411). The opposite external threads at both ends of the bidirectional lead screw (2412) are respectively screwed to the two sets of clamping blocks (23) in the longitudinal direction. The base (21) is provided with a drive motor (43) and a drive transmission wheel (2414). The end of the bidirectional lead screw (2412) is provided with a driven transmission wheel (2413). The drive transmission wheel (2414) drives the driven transmission wheel (2413) to rotate synchronously through a chain belt (2415). The internal structure of the transverse centering component (242) is the same as that of the longitudinal centering component (241).

3. The positioning fixture for semiconductor shunt plate welding according to claim 2, characterized in that, The lifting and placing plate (22) has sliding grooves (221) on its four sides respectively; the clamping block (23) also includes a moving rod (231) and a sliding rod (233) slidably connected to the moving rod (231). The moving rod (231) has a threaded hole (232) that is screwed to the bidirectional lead screw (2412), and both sides are fitted and limited to the inner wall of the sliding groove (221); one end of the sliding rod (233) is provided with an end cap (235), and the other end is connected to the clamping body (234). A first spring (236) is sleeved on the sliding rod (233) and connected between the end cap (235) and the moving rod (231).

4. A positioning fixture for semiconductor shunt plate welding according to claim 3, characterized in that, The pressing component (3) further includes a rotating ring (32) rotatably disposed on the outer periphery of the fixed disk (31). The bottom of the rotating ring (32) is provided with a device groove (321) corresponding to the position of the clamping block (23). The extrusion rod (6) is slidably disposed in the device groove (321). A second spring (61) is provided in the device groove (321) to abut against the extrusion rod (6). The elastic force of the second spring (61) is greater than that of the first spring (236).

5. A positioning fixture for semiconductor shunt plate welding according to claim 4, characterized in that, A rack (64) is connected to the extrusion rod (6), a small gear (65) that can mesh with the rack (64) is rotatably provided at the bottom of the rotating ring (32), a large gear (66) that is coaxially linked with the small gear (65) is rotatably provided at the top of the rotating ring (32), and a fixed gear ring (67) is fixed at the top of the fixed plate (31). When the rack (64) meshes with the pinion (65), the pinion (65) rotates, causing the large gear (66) to move along the fixed gear ring (67), driving the rotating ring (32) to rotate and causing the pressing rod (6) to move, so that the pressing rod (6) disengages from the clamping body (234).

6. A positioning fixture for semiconductor shunt plate welding according to claim 5, characterized in that, A smooth straight rod is provided at one end of the rack (64) near the pinion (65); in the initial stage when the extrusion rod (6) moves down and moves away from the diverter plate (4), the smooth straight rod and the pinion (65) do not form a transmission relationship, and the counter-thrust generated by the compression of the second spring (61) further drives the clamping body (234) to press against the diverter plate (4); when the extrusion rod (6) continues to move until the rack (64) meshes with the pinion (65), the force of the clamping body (234) on the diverter plate (4) is released.

7. A positioning fixture for semiconductor shunt plate welding according to claim 4, characterized in that, The distance between the extrusion rod (6) and the center of the fixed plate (31) is adjustable; an adjustment rod (62) is inserted into the equipment slot (321), and an intermediate block (621) and an end block (622) with their outer periphery in contact with the inner wall of the equipment slot (321) are rotatably sleeved on the adjustment rod (62). The outer surface of the adjustment rod (62) between the intermediate block (621) and the end block (622) is a smooth section, and a slider (623) fixed to the extrusion rod (6) is slidably sleeved on the smooth section.

8. A positioning fixture for semiconductor shunt plate welding according to claim 7, characterized in that, The adjusting rod (62) has a rotating cap (624) fixed at one end on the outside. The surface of the adjusting rod (62) is provided with an external thread that is screwed into the wall of the equipment groove (321). The bottom of the rotating ring (32) is also provided with a synchronizing element (63). The synchronizing element (63) includes a bevel gear (632). The outer periphery of the rotating cap (624) is fixed with a helical gear (631) that meshes with the bevel gear (632) to achieve synchronous adjustment.

9. A positioning fixture for semiconductor shunt plate welding according to claim 6, characterized in that, The top of the rotating ring (32) is also provided with a reset component (68); the reset component (68) includes an annular groove (681) opened on the top of the rotating ring (32), a rotating ring plate (682) is rotatably provided on the top of the inner wall of the diffusion welding box (1), an elastic telescopic rod (683) is fixed at the bottom of the rotating ring plate (682), and an adapter plate (6831) adapted to the annular groove (681) is fixed at the bottom of the elastic telescopic rod (683); a drive tooth (684) is sleeved on the outer periphery of the rotating ring plate (682), an outer toothed ring (685) meshing with the drive tooth (684) is provided on the top of the diffusion welding box (1), and a servo motor (686) driving the outer toothed ring (685) to rotate. In the initial state where the hydraulic rod (5) drives the rotating ring (32) to move downward, the adapter plate (6831) is located at the end of the ring groove (681); when the diffusion welding process ends and the hydraulic rod (5) drives the rotating ring (32) to move upward and reset, the servo motor (686) drives the external toothed ring (685) to rotate, causing the rotating ring plate (682) to rotate at least two revolutions, so that the adapter plate (6831) slides into the ring groove (681) and drives the rotating ring (32) to rotate through the end of the ring groove (681), thereby realizing the position reset of the extrusion rod (6).

10. A positioning fixture for semiconductor shunt plate welding according to any one of claims 1 to 9, characterized in that, The base (21) has an electric drive telescopic rod (222) at each of its four internal corners. The output end of the electric drive telescopic rod (222) passes through the top of the base (21) and is fixed to the bottom of the lifting and placing plate (22). The clamping body (234) has an arc surface (2342) on one side away from the diverter plate (4).

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