Clamp for welding semiconductor device

Abstract

The invention relates to the technical field of welding fixtures, and discloses a fixture for semiconductor device welding, which comprises a base, a storage cavity is formed in the bottom surface of the base, fixing holes are formed in four corners of the base in a penetrating manner, and four moving ports communicated with the storage cavity are formed in the middle of the upper surface of the base in a penetrating manner; a lifting mechanism is connected to the side, close to the moving opening, of the storage cavity, a moving plate slidably connected into the storage cavity is connected to the output end of the lifting mechanism, supporting blocks are fixedly connected to the four edges of the side, close to the moving opening, of the moving plate, and a moving mechanism is connected to the middle of the side, close to the supporting blocks, of the moving plate; the four output ends of the moving mechanism are connected with the four supporting blocks correspondingly. According to the clamp for welding the semiconductor device, the double-end motor drives the lead screw to adjust the positions of the moving block and the extension plate, the clamp is matched with the four-side extrusion structure, the clamp can be compatible with PCBs of different length and width specifications, the clamp does not need to be independently arranged for each size, and the equipment purchasing and replacing cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, specifically a fixture for welding semiconductor devices. Background Technology

[0002] In semiconductor manufacturing processes, soldering is a critical step in connecting chips to other components such as lead frames or printed circuit boards (PCBs). To ensure the quality and precision of soldering, specially designed fixtures are required to maintain the stability and correct positioning of semiconductor devices.

[0003] Patent CN220881104U discloses a fixture for soldering semiconductor devices. This fixture includes a base, two first sliders for holding the device, multiple second sliders, and multiple magnetic components. After placing the device on the support surface, the two first sliders are moved to clamp the device onto the support surface. The positions of the second sliders are adjusted according to the fixed position of the device. When each pin is placed on the magnetic component, the pin is attracted by the magnetic component, thus being fixed and aligned with the soldering position on the device. The entire fixture has a simple structure and is easy to operate, enabling rapid fixing and alignment of the device and pins, thereby improving soldering efficiency and quality and preventing device damage during the soldering process.

[0004] However, the above-mentioned welding fixtures still have the following problems in actual use: During the PCB board clamping and fixing process, due to the significant dimensional diversity of PCB boards (such as large differences in length, width, and height between different models and specifications), production lines need to configure dedicated fixtures for PCB boards of the same specification to achieve stable fixing. However, in this "one size, one fixture" approach, when producing PCB boards of different sizes, it undoubtedly increases the manufacturer's cost of fixture manufacturing or procurement. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fixture for soldering semiconductor devices, which can be adaptively adjusted according to PCB boards of different sizes, eliminating the need to manufacture or purchase different models of fixtures.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fixture for soldering semiconductor devices, comprising a base, a receiving cavity formed on the bottom surface of the base, fixing holes formed through the four corners of the base, and four movable openings formed through the middle of the upper surface of the base, each communicating with the receiving cavity. A lifting mechanism is connected to the side of the receiving cavity near the movable openings. A movable plate is slidably connected inside the receiving cavity to the output end of the lifting mechanism. Support blocks are fixedly connected to the four sides of the movable plate near the movable openings. A movable mechanism is connected to the middle of the side of the movable plate near the support blocks. The four output ends of the movable mechanism are respectively connected to the four support blocks, and each of the four output ends of the movable mechanism is also connected to a movable block. Two extension plates are connected to the upper surface of each of the four movable blocks. The upper ends of the eight extension plates extend through to the top of the movable openings, and two extension plates on the same movable plate are slidably connected to the same movable opening. A pressure sensor is provided inside the upper end of each of the eight extension plates.

[0007] Furthermore, the lifting mechanism includes a first electric push rod and a telescopic rod. The upper ends of the first electric push rod and the telescopic rod are both fixedly connected to the inner wall of the storage cavity near the moving opening. The output end of the first electric push rod and the other end of the telescopic rod are both fixedly connected to the moving plate.

[0008] Furthermore, two mounting holes are provided on the upper surface of the base. The ends of the first electric actuator and the telescopic rod away from the moving plate are both fixedly connected to mounting rods. The two mounting rods pass through the two mounting holes respectively and are threaded with nuts. The two nuts are located in the mounting holes respectively.

[0009] Furthermore, the moving mechanism includes a mounting base, two dual-head motors, and four lead screws. The bottom surface of the mounting base is fixedly connected to the middle of the upper surface of the moving plate, and the upper surface of the mounting base is fixedly connected to the outer wall of the first dual-head motor. The outer wall on the other side of the first dual-head motor is fixedly connected to the outer wall of the second dual-head motor. The two output shafts of the two dual-head motors are respectively fixedly connected to one end of the four lead screws. The other ends of the four lead screws pass through the four moving blocks and are rotatably connected to the four support blocks respectively. The lead screws are threadedly connected to the moving blocks.

[0010] Furthermore, pressure blocks are fixedly connected to the upper ends of the eight extension plates, and pressure sensors No. 2 are installed inside the eight pressure blocks.

[0011] Furthermore, a proximity sensor is fixedly connected to the upper surface of each of the eight pressure blocks.

[0012] Furthermore, two L-shaped plates are fixedly connected to the side of each of the four moving blocks closest to the dual-head motor. The other ends of the two L-shaped plates are connected to a pushing mechanism. The output ends of the two pushing mechanisms are respectively connected to two extension plates on the same moving block. A partition block is fixedly connected to the middle of the upper surface of each of the four moving blocks. A rotating shaft is fixedly connected to the interior of the lower end of each of the four partition blocks. The two ends of the four rotating shafts away from the partition blocks are respectively rotatably connected to the lower ends of the two extension plates on the same moving block.

[0013] Furthermore, the driving mechanism includes a first rod, a second rod, a second electric actuator, a rotating rod, two first blocks, and two second blocks. The lower ends of the two first blocks are fixedly connected to the end of the L-shaped plate away from the moving block. The two ends of the first rod are fixedly connected to the two first blocks respectively. One end of the rotating rod is sleeved and rotatably connected to the outer wall of the middle part of the first rod. The other end of the rotating rod is fixedly connected to one end of the second electric actuator. The output end of the second electric actuator is sleeved and rotatably connected to the outer wall of the middle part of the second rod. The two ends of the second rod are fixedly connected to one end of the two second blocks respectively. The other ends of the two second blocks are fixedly connected to the same extension plate.

[0014] Furthermore, the upper surface of the base has two through-holes that are connected to the storage cavity. Two limiting shells are fixedly connected to the side of the storage cavity near the through-holes, and each limiting shell has an opening on the side near the through-hole. Both ends of the inner wall of the limiting shell are rotatably connected to synchronous wheels. The outer walls of the two synchronous wheels are fitted with and slidably connected to synchronous belts. One side of the synchronous belt is connected to a self-sensing mechanism, which is located inside the through-hole, and the detection end of the self-sensing mechanism faces upwards from the base.

[0015] Furthermore, the self-sensing mechanism includes a second proximity sensor, a slider, and a sliding rod. A sliding opening is provided on the side of the through-hole away from the receiving cavity. One end of the slider is fixedly connected to the side wall of the timing belt, and the end of the slider near the timing belt is also slidably connected to the opening. The end of the slider away from the timing belt is fixedly connected to the lower end of the sliding rod. The upper end of the sliding rod passes through the through-hole and is fixedly connected to the second proximity sensor. The sliding rod is slidably connected to the through-hole, and the second proximity sensor is slidably connected to the sliding opening.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This type of fixture for semiconductor device welding uses a dual-head motor to drive a lead screw to adjust the position of the moving block and extension plate. Combined with a four-sided extrusion structure, it can be compatible with PCB boards of different lengths and widths, eliminating the need to configure a separate fixture for each size, thus significantly reducing equipment procurement and replacement costs. 2. This type of fixture for semiconductor device welding has a built-in pressure sensor on the extension board to achieve balanced clamping force detection, and a second pressure sensor integrated in the pressure block to accurately control the downward pressure. With the help of silicone / rubber pads, it can ensure welding stability and avoid PCB board damage caused by excessive extrusion. 3. This type of fixture for welding semiconductor devices has a proximity sensor on the top of the pressure block that can identify the position of the welding head. The extension plate is rotated around the rotation axis by the pushing mechanism to avoid interference with the welding head when welding at the edge, which solves the problem of interference between the traditional fixture and the welding head when welding at the edge and improves the safety of operation. 4. This type of fixture for semiconductor device soldering integrates a sliding second proximity sensor in the base. It automatically triggers the clamping process by detecting the PCB board coverage signal, eliminating the need for manual start-up. It also supports sensor position adjustment to adapt to miniature or irregularly shaped PCB boards, optimizing ease of operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall appearance of the present invention; Figure 2 This is a schematic diagram of the overall appearance of the invention from another perspective; Figure 3 This is a schematic diagram of the internal structure of the base of the present invention; Figure 4 This is a partial cross-sectional schematic diagram of the base of the present invention; Figure 5 This is a detailed connection diagram of the moving plate, lifting mechanism, and moving mechanism components of the present invention; Figure 6 This is a detailed connection diagram of the moving plate, lifting mechanism, and pushing mechanism of the present invention; Figure 7 This is a detailed connection diagram of the components of the present invention, including the limiting shell, the timing belt, and the self-sensing mechanism. Figure 8 This is a detailed connection diagram of the components of the present invention, including the moving block, the L-shaped plate, and the pushing mechanism.

[0018] In the diagram: 1. Base; 2. Moving block; 3. Extension plate; 4. Proximity sensor 1; 5. Proximity sensor 2; 6. Moving plate; 7. Support block; 8. Lead screw; 9. Electric actuator 1; 10. Limiting shell; 11. Synchronous belt; 12. Telescopic rod; 13. Mounting rod; 14. Dual-head motor; 15. Mounting seat; 16. Synchronous pulley; 17. Slider; 18. Sliding rod; 19. Opening; 20. Block 1; 21. L-shaped plate; 22. Rod 1; 23. Block 2; 24. Rod 2; 25. Electric actuator 2; 26. Rotating rod; 27. Pressure sensor 1; 28. Pressure sensor 2; 29. ​​Rotating shaft; 30. Separator block; 31. Pressure block; 101. Fixing hole; 102. Moving opening; 103. Mounting hole; 104. Sliding opening; 105. Through opening; 106. Storage cavity. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Please see Figures 1-8 A fixture for soldering semiconductor devices includes a base 1. A receiving cavity 106 is formed on the bottom surface of the base 1. Fixing holes 101 are formed through each of the four corners of the base 1. Four movable openings 102, each communicating with the receiving cavity 106, are formed through the center of the upper surface of the base 1. A lifting mechanism is connected to the side of the receiving cavity 106 near the movable openings 102. The output end of the lifting mechanism is connected to a movable plate 6 that is slidably connected inside the receiving cavity 106. Support blocks 7 are fixedly connected to the four sides of the movable plate 6 near the movable openings 102. A moving mechanism is connected to the middle of the moving plate 6 near the support block 7. The four output ends of the moving mechanism are connected to the four support blocks 7 respectively, and the four output ends of the moving mechanism are also connected to the moving block 2. Two extension plates 3 are connected to the upper surface of each of the four moving blocks 2. The upper ends of the eight extension plates 3 extend through to the top of the moving port 102. The two extension plates 3 on the same moving plate 6 are slidably connected to the same moving port 102. A pressure sensor 27 is installed inside the eight extension plates 3 at the upper end of the base 1.

[0021] The lifting mechanism includes a first electric push rod 9 and a telescopic rod 12. The upper ends of the first electric push rod 9 and the telescopic rod 12 are fixedly connected to the inner wall of the storage cavity 106 near the moving port 102. The output end of the first electric push rod 9 and the other end of the telescopic rod 12 are fixedly connected to the moving plate 6.

[0022] Two mounting holes 103 are provided on the upper surface of the base 1. The end of the first electric push rod 9 and the telescopic rod 12 away from the moving plate 6 are fixedly connected to the mounting rod 13. The two mounting rods 13 pass through the two mounting holes 103 respectively and are threaded with nuts. The two nuts are located in the mounting holes 103 respectively.

[0023] The moving mechanism includes a mounting base 15, two dual-head motors 14, and four lead screws 8. The bottom surface of the mounting base 15 is fixedly connected to the middle of the upper surface of the moving plate 6. The upper surface of the mounting base 15 is fixedly connected to the outer wall of the first dual-head motor 14. The outer wall on the other side of the first dual-head motor 14 is fixedly connected to the outer wall of the second dual-head motor 14. The two output shafts of the two dual-head motors 14 are fixedly connected to one end of the four lead screws 8 respectively. The other ends of the four lead screws 8 pass through the four moving blocks 2 and are rotatably connected to the four support blocks 7 respectively. The lead screws 8 are threadedly connected to the moving blocks 2.

[0024] like Figures 1 to 8As shown, when using the fixture for semiconductor device welding in this invention, the bottom surface of the base 1 (the side near the receiving cavity 106) is first placed on the welding table (this is the prior art). Then, the base 1 is connected to the welding table stably by passing four bolts through the four fixing holes 101 respectively. Subsequently, the power supply of the dual-head motor 14, the eight pressure sensors 27 and the electric actuator 9 inside the base 1 are connected to the external main power supply. At the same time, the dual-head motor 14, the eight pressure sensors 27 and the electric actuator 9 are connected to the external PLC controller (this is the prior art, hereinafter referred to as the controller). Then, simply place the workpiece to be welded (such as a PCB board) face down on the upper surface of the base 1. At this time, turn on one of the dual-head motors 14 through the controller. After the first dual-head motor 14 starts, its two output shafts drive the two connected lead screws 8 to rotate simultaneously. At this time, the two lead screws 8 will move laterally together with the two moving blocks 2 connected to the surface. At the same time, the two extension plates 3 connected to the moving blocks 2 will also move along the moving port 102 (and because of the restriction of the moving port 102 and the extension plates 3, when the lead screws 8 rotate, the extension plates 3 will only move along the moving port 102 and will not rotate themselves). As the four extension plates 3 on the two moving blocks 2 move, the four extension plates 3 can push the PCB board together towards the center of the base 1 from one of the two sides (e.g., the left and right sides) of the PCB board. When the four pressure sensors 27 at the top of the four extension plates 3 feel the same pressure (or simultaneously reach the set allowable error value), it means that the four pressure sensors 27 have squeezed the left and right sides of the PCB board tightly. Afterwards, the first dual-head motor 14 is turned off, and the second dual-head motor 14 is turned on at the same time (the purpose of setting the two dual-head motors 14 to turn on separately is that because different PCB boards have different lengths and widths, if the two dual-head motors 14 are turned on at the same time, or if they are operated at the same time through a certain linkage structure, it is not possible to use PCB boards of different sizes to hold them). After the second dual-head motor 14 is turned on, it will push the four extension plates 3 on the front and rear sides towards the middle at the same time. When the pressure sensor 27 on the four extension plates 3 also detects the same squeezing force, it means that the front, rear, left and right sides of the PCB board have been squeezed tightly, thus completing the fixation of the PCB board. After that, you only need to place the chip to be soldered in the appropriate position on the PCB board, and then you can solder it by external soldering equipment (whether it is manual soldering or automatic machine soldering, it is existing technology and will not be described in detail here). It is convenient and fast.

[0025] As a preferred embodiment of the present invention, each of the eight extension plates 3 is fixedly connected to a pressure block 31 at its upper end, and each of the eight pressure blocks 31 is provided with a second pressure sensor 28.

[0026] More specifically, since the eight extension plates 3 only squeeze and limit the PCB board from the front, back, left, and right sides, Wield further improves the limiting and fixing of the PCB board. At this time, by setting the pressure block 31, after the eight extension plates 3 squeeze the PCB board tightly, the controller only needs to turn on the first electric push rod 9. The output end of the first electric push rod 9 extends outward, and with the telescopic rod 12 supporting the other side of the moving plate 6, the moving plate 6 can be pushed down stably along the storage cavity 106. As the moving plate 6 descends, the dual-head motor 14, support block 7, moving block 2 and extension plate 3 connected to the moving plate 6 can also descend together. Then, the pressure block 31 located at the upper end of the extension plate 3 can press the PCB board onto the surface of the base 1 from the edge of the upper surface of the PCB board. With the second pressure sensor 28, the pressing intensity can be detected in real time. When the set value is reached, the first electric push rod 9 is automatically turned off. It should be noted that silicone or rubber pads are provided on the side of the pressure block 31 and the extension plate 3 adjacent to the PCB board, which increases friction and reduces damage to the PCB board.

[0027] As a preferred embodiment of the present invention, a proximity sensor 4 is fixedly connected to the upper surface of each of the eight pressure blocks 31.

[0028] More specifically, because some chips need to be soldered near the edge of the PCB board, and the heating head and wire feed head of the external soldering equipment are usually large, the heating head and wire feed head may collide with the adjacent pressure block 31 when the chip comes out of the soldering edge. At this time, by setting a proximity sensor 4, when the heating head and wire feed head are squeezed close to the pressure blocks 31 at both ends, the proximity sensor 4 will be detected, and the staff can be reminded to avoid it in time, thus reducing the collision rate. It should be noted that pressure sensor 27 and pressure sensor 28 can be model: Ruizhichen MEMS metal packaged pressure sensor, with a diameter of 10mm and a thickness of 2.6mm. It can be integrated into the small space of extension plate 3 and pressure block 31. Its all-metal sealed + oil-filled core structure is suitable for the vibration environment during the welding process. At the same time, its protection level of IP67 can resist oil and dust.

[0029] As a preferred embodiment of the present invention, two L-shaped plates 21 are fixedly connected to the side of each of the four moving blocks 2 near the dual-head motor 14. The other ends of the two L-shaped plates 21 are connected to a pushing mechanism. The output ends of the two pushing mechanisms are respectively connected to two extension plates 3 on the same moving block 2. A partition block 30 is fixedly connected to the middle of the upper surface of each of the four moving plates 6. A rotating shaft 29 is fixedly connected to the interior of the lower end of each of the four partition blocks 30. The two ends of the four rotating shafts 29 away from the partition blocks 30 are respectively rotatably connected to the lower ends of the two extension plates 3 on the same moving block 2.

[0030] The driving mechanism includes a first rod 22, a second rod 24, a second electric actuator 25, a rotating rod 26, two first blocks 20, and two second blocks 23. The lower ends of the two first blocks 20 are fixedly connected to the end of the L-shaped plate 21 away from the moving block 2. The two ends of the first rod 22 are fixedly connected to the two first blocks 20 respectively. One end of the rotating rod 26 is sleeved and rotatably connected to the outer wall of the middle part of the first rod 22. The other end of the rotating rod 26 is fixedly connected to one end of the second electric actuator 25. The output end of the second electric actuator 25 is sleeved and rotatably connected to the outer wall of the middle part of the second rod 24. The two ends of the second rod 24 are fixedly connected to one end of the two second blocks 23 respectively. The other ends of the two second blocks 23 are fixedly connected to the same extension plate 3.

[0031] More specifically, when proximity sensor 4 detects the approach of a heating head or wire feeder, the controller automatically activates electric actuator 25. The output end of electric actuator 25 extends outward. Since the output end of electric actuator 25 rotates on rod 24, and the rear of electric actuator 25 rotates on rod 22, the extension plate 3 and the pressure block 31 can be rotated together via the rotating shaft 29 at the same time as electric actuator 25 is activated. This allows the extension plate 3, which is close to the heating head or wire feeder, to be rotated away, thus avoiding a collision. It should be noted that since there are two extension plates 3 on the same side of the PCB board (in actual applications, if the base 1 is large, more extension plates 3 can be set, and there is no specific limitation), and extension plates 3 are set on all four sides of the PCB board, folding only one extension plate 3 (because the heating head and wire feeding head are soldered in sequence and according to the settings, it is impossible for them to collide with multiple extension plates 3 at the same time) will not affect the overall fixation of the PCB board.

[0032] As a preferred embodiment of the present invention, the upper surface of the base 1 has two through-holes 105 that are both connected to the storage cavity 106. Two limiting shells 10 are fixedly connected to the side of the storage cavity 106 near the through-holes 105, which are respectively adjacent to the two through-holes 105. The limiting shell 10 has an opening 19 on the side near the through-holes 105. Both ends of the inner wall of the limiting shell 10 are rotatably connected to synchronous wheels 16. The outer walls of the two synchronous wheels 16 are fitted with and slidably connected to synchronous belts 11. One side of the synchronous belt 11 is connected to a self-sensing mechanism. The self-sensing mechanism is located inside the through-holes 105, and the detection end of the self-sensing mechanism faces upwards from the base 1.

[0033] The self-sensing mechanism includes a second proximity sensor 5, a slider 17, and a slide bar 18. A slide opening 104 is provided on the side of the through-hole 105 away from the receiving cavity 106. One end of the slider 17 is fixedly connected to the side wall of the synchronous belt 11, and the end of the slider 17 near the synchronous belt 11 is also slidably connected to the opening 19. The end of the slider 17 away from the synchronous belt 11 is fixedly connected to the lower end of the slide bar 18. The upper end of the slide bar 18 passes through the through-hole 105 and is fixedly connected to the second proximity sensor 5. The slide bar 18 is slidably connected to the through-hole 105, and the second proximity sensor 5 is slidably connected to the slide opening 104.

[0034] More specifically, when the PCB board is placed on the upper surface of the base 1, as long as any position of the PCB board covers the two proximity sensors 5, the two proximity sensors 5 will immediately transmit electrical signals to the external processor, and then the dual-head motor 14 will be turned on by the controller. No manual operation is required, which is more convenient and faster. Furthermore, due to the different sizes of PCB boards, in order to avoid some PCB boards that are too small to cover the two proximity sensors 5 at the same time, and also to avoid the two proximity sensors 5 being too close together and causing the PCB board to be started before it is properly placed, the dual-head motor 14 is activated (because the above clamping structure is squeezed from the four sides towards the middle by four extension plates 3, so to avoid the four corners of the PCB board being aligned with the four moving blocks 2 when the PCB board is placed, which would cause subsequent clamping inaccuracies, although precise alignment is not required when placing the PCB board, at least the approximate orientation of the PCB board must be ensured). It can be done manually (because the adjustment probability is not high and high precision is not required, of course, a motor can also be set at one end of one of the synchronous wheels 16 for driving, the specific is not limited) by pushing the proximity sensor 5 or the slide bar 18, so that the proximity sensor 5 moves inside the slide 104, thereby changing the position of the proximity sensor 5 to adapt to more PCB boards of different sizes; Finally, it should be noted that both proximity sensor 4 (number one) and proximity sensor 5 (number two) can be inductive proximity sensors. Their principle is based on electromagnetic induction, generating an alternating magnetic field through a high-frequency oscillating coil. When an object (such as a heating head or wire feeder) enters the magnetic field, eddy currents are induced on the metal surface, causing a change in the coil inductance, which in turn triggers a signal output. Of course, gas sensors with equivalent functionality can also be used; the specific method is not limited.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixture for soldering semiconductor devices, characterized in that: Includes a base (1), the bottom surface of which has a storage cavity (106), and four corners of which have through-holes (101). The upper surface of the base (1) has four through-holes (102) communicating with the storage cavity (106). A lifting mechanism is connected to the side of the storage cavity (106) near the through-holes (102). The output end of the lifting mechanism is connected to a sliding plate (6) that slides inside the storage cavity (106). Support blocks (7) are fixedly connected to the four sides of the sliding plate (6) near the through-holes (102). A moving mechanism is connected to the middle of the side near the support block (7). The four output ends of the moving mechanism are connected to the four support blocks (7) respectively, and the four output ends of the moving mechanism are also connected to the moving block (2). The upper surface of the four moving blocks (2) is connected to two extension plates (3). The upper ends of the eight extension plates (3) extend to the top of the moving port (102). The two extension plates (3) on the same moving plate (6) are slidably connected to the same moving port (102). The interior of the eight extension plates (3) located above the base (1) is provided with a pressure sensor (27).

2. The fixture for welding semiconductor devices according to claim 1, characterized in that: The lifting mechanism includes a first electric push rod (9) and a telescopic rod (12). The upper ends of the first electric push rod (9) and the telescopic rod (12) are fixedly connected to the inner wall of the storage cavity (106) near the moving port (102). The output end of the first electric push rod (9) and the other end of the telescopic rod (12) are fixedly connected to the moving plate (6).

3. A fixture for welding semiconductor devices according to claim 2, characterized in that: The upper surface of the base (1) has two mounting holes (103). The end of the first electric push rod (9) and the telescopic rod (12) away from the moving plate (6) is fixedly connected to the mounting rod (13). The two mounting rods (13) pass through the two mounting holes (103) respectively and are threaded with nuts. The two nuts are located in the mounting holes (103) respectively.

4. A fixture for welding semiconductor devices according to claim 3, characterized in that: The moving mechanism includes a mounting base (15), two dual-head motors (14) and four lead screws (8). The bottom surface of the mounting base (15) is fixedly connected to the middle of the upper surface of the moving plate (6). The upper surface of the mounting base (15) is fixedly connected to the outer wall of the first dual-head motor (14). The outer wall of the other side of the first dual-head motor (14) is fixedly connected to the outer wall of the second dual-head motor (14). The two output shafts of the two dual-head motors (14) are fixedly connected to one end of the four lead screws (8). The other end of the four lead screws (8) passes through the four moving blocks (2) and is rotatably connected to the four support blocks (7). The lead screws (8) are threadedly connected to the moving blocks (2).

5. A fixture for soldering semiconductor devices according to claim 4, characterized in that: Each of the eight extension plates (3) has a pressure block (31) fixedly connected to its upper end, and each of the eight pressure blocks (31) has a second pressure sensor (28) installed inside.

6. A fixture for welding semiconductor devices according to claim 5, characterized in that: Each of the eight pressure blocks (31) has a proximity sensor (4) fixedly connected to its upper surface.

7. A fixture for soldering semiconductor devices according to claim 6, characterized in that: Two L-shaped plates (21) are fixedly connected to the side of each of the four movable blocks (2) near the dual-head motor (14). The other ends of the two L-shaped plates (21) are connected to a pushing mechanism. The output ends of the two pushing mechanisms are respectively connected to two extension plates (3) on the same movable block (2). A partition block (30) is fixedly connected to the middle of the upper surface of each of the four movable plates (6). A rotating shaft (29) is fixedly connected to the interior of the lower end of each of the four partition blocks (30). The two ends of the four rotating shafts (29) away from the partition blocks (30) are respectively rotatably connected to the lower ends of the two extension plates (3) on the same movable block (2).

8. A fixture for soldering semiconductor devices according to claim 7, characterized in that: The pushing mechanism includes a first rod (22), a second rod (24), a second electric actuator (25), a rotating rod (26), two first blocks (20) and two second blocks (23). The lower ends of the two first blocks (20) are fixedly connected to the end of the L-shaped plate (21) away from the moving block (2). The two ends of the first rod (22) are fixedly connected to the two first blocks (20) respectively. One end of the rotating rod (26) is sleeved and rotatably connected to the outer wall of the middle part of the first rod (22). The other end of the rotating rod (26) is fixedly connected to one end of the second electric actuator (25). The output end of the second electric actuator (25) is sleeved and rotatably connected to the outer wall of the middle part of the second rod (24). The two ends of the second rod (24) are fixedly connected to one end of the two second blocks (23) respectively. The other ends of the two second blocks (23) are fixedly connected to the same extension plate (3).

9. A fixture for welding semiconductor devices according to claim 8, characterized in that: The upper surface of the base (1) has two through holes (105) that are connected to the storage cavity (106). The storage cavity (106) is fixedly connected to two limiting shells (10) that are adjacent to the two through holes (105) on the side of the through holes (105). The limiting shell (10) has an opening (19) on the side of the through holes (105). Both ends of the inner wall of the limiting shell (10) are rotatably connected to synchronous wheels (16). The outer walls of the two synchronous wheels (16) are fitted with and slidably connected to a synchronous belt (11). One side of the synchronous belt (11) is connected to a self-sensing mechanism. The self-sensing mechanism is located inside the through hole (105), and the detection end of the self-sensing mechanism faces upwards from the base (1).

10. A fixture for soldering semiconductor devices according to claim 9, characterized in that: The self-sensing mechanism includes a second proximity sensor (5), a slider (17), and a slide bar (18). A slide opening (104) is provided on the side of the through-hole (105) away from the receiving cavity (106). One end of the slider (17) is fixedly connected to the side wall of the synchronous belt (11), and the end of the slider (17) near the synchronous belt (11) is also slidably connected to the opening (19). The end of the slider (17) away from the synchronous belt (11) is fixedly connected to the lower end of the slide bar (18). The upper end of the slide bar (18) passes through the through-hole (105) and is fixedly connected to the second proximity sensor (5). The slide bar (18) is slidably connected to the through-hole (105), and the second proximity sensor (5) is slidably connected to the slide opening (104).

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