Automatic needle pressing mechanism for pressing and fixing welding products of vacuum welding furnace

Abstract

The utility model discloses a kind of automatic needle pressing mechanisms of vacuum welding furnace welding product compression fixation, it is related to welding equipment technical field.The utility model includes support platform, support platform bottom is equipped with lifting assembly, lifting assembly includes four synchronous lifters, and between the bottom of synchronous lifter and support platform installation is equipped with limiting component, and limiting component is used to limit the moving height of synchronous lifter;Synchronous lifter top end is equipped with lifting rod, and each lifting rod top end is equipped with needle pressing disc between, and needle pressing disc top end is evenly arranged with needle pressing component, and support platform top end is fixedly connected with welding table, and welding table top end is placed with welding piece tray, and welding piece tray top end is evenly arranged with chip, and each chip top end is placed with lead frame between.The utility model is equipped with needle pressing component and limiting component of anti-overvoltage, protect chip while making needle can compact chip everywhere to be welded point.

Description

Technical Field

[0001] This utility model belongs to the field of welding equipment technology, specifically relating to an automatic pressing needle mechanism for pressing and fixing welded products in a vacuum welding furnace. Background Technology

[0002] When welding products in a vacuum welding furnace, two components need to be melted and welded together using solder paste, silver paste, or copper paste. During welding, a clamping structure is required to press the welding surface firmly to avoid incomplete soldering.

[0003] In the prior art, when welding products such as silicon carbide substrates for terminal chips, pressure pins are used to clamp and position the chip and lead frame. The drawback of this technical solution is that, due to the thickness difference and flatness error in various parts of the chip, after the lead frame and chip are positioned in the welding carrier, the thickness difference and flatness error will cause local welding points to not fit tightly, resulting in welding gaps. If the gap of the welding point is too large, local cold solder joints will still occur even when the lead frame is clamped.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] The purpose of this utility model is to provide an automatic pin clamping mechanism for clamping and fixing welded products in a vacuum welding furnace. The technical problem to be solved is as follows: When the existing lead frame is clamped in the vacuum furnace, there is a problem that the local solder joints are not compacted, which leads to the problem of poor soldering when it is subsequently soldered to the chip.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An automatic pin-pressing mechanism for pressing and fixing welded parts in a vacuum welding furnace includes a support platform. A lifting assembly is installed at the bottom of the support platform. The lifting assembly includes four synchronous lifters. A limit component is installed between the bottom of one of the synchronous lifters and the support platform. The limit component is used to limit the moving height of the synchronous lifter. A lifting rod is installed at the top of the synchronous lifter. A pin-pressing plate is installed between the tops of each lifting rod. Pin-pressing components are evenly arranged at the top of the pin-pressing plate. A welding platform is fixedly connected to the top of the support platform. A workpiece tray is placed at the top of the welding platform. Chips are evenly arranged at the top of the workpiece tray. A lead frame is placed between the tops of each chip. The pin-pressing components are used to press the chips and the lead frame together.

[0008] As a further embodiment of this utility model: four support columns are installed at the bottom of the support platform, the synchronous lifter is installed at the bottom of the support columns, the lifting assembly also includes a coupling installed between two adjacent synchronous lifters, each synchronous lifter is located on the same horizontal plane, a lifting motor is installed on one side of one of the synchronous lifters, a reducer is provided on one side of the lifting motor, and the output end of the reducer is connected to the adjacent synchronous lifter.

[0009] As a further embodiment of this utility model: the limiting component includes a side plate disposed on one side of the bottom of one of the synchronous lifters, two side frames are installed on one side of the side plate, and a bottom limit switch is installed on one side of the side frame at the bottom end, and a top limit switch is installed on one side of the other side frame. A through hole is opened on one side of the support column, and contacts are provided at the bottom and top of the through hole.

[0010] As a further embodiment of this utility model: an origin switch is installed on one side of the side plate, and the origin switch is electrically connected to the lifting assembly.

[0011] As a further embodiment of this utility model: the pressure needle assembly includes three pressure needle seats installed on the top of the pressure needle plate, a pressure needle spring is fixedly connected to the bottom of the pressure needle seat, a pressure needle is fixedly connected to the bottom end of the pressure needle spring, the top end of the pressure needle is slidably connected to the pressure needle seat, and each pressure needle is located on a different side of the top of the lead frame.

[0012] As a further embodiment of this utility model: a vacuum chamber is installed on the outer side of the top of the support platform, and a vacuum chamber cover plate is rotatably connected to the top of the vacuum chamber, with the bottom surface of the vacuum chamber cover plate being separate from the top of the pressure needle plate.

[0013] The beneficial effects of this utility model are:

[0014] By installing synchronously lifting components at the bottom of the support platform, connecting the pressure pin plate between the top of the lifting components via lifting rods, and evenly installing pressure pin components on the pressure pin plate, after the welding tray is placed on the welding table at the top of the support platform, the lifting components are moved in height by the origin switch, controlling the pressure pins of the pressure pin components to press against the lead frame. When the lead frame presses against different sides of the chip, the multiple pressure pins that press down synchronously are affected by the contraction of the pressure pin springs, which can keep the solder joints on all sides of the chip pressed to a compacted state, and avoid the problem of false pressure caused by rigid pressing pins in the prior art to avoid damaging the chip, thereby improving the pressing effect of the equipment on the workpiece to be welded.

[0015] Furthermore, by setting a limiting component on one side of the bottom of the support platform, and using the bottom and top limit switches set in the limiting component to control the lifting component, the operating height of the lifting component is limited to a safe range that does not collide with the internal structure and avoids overvoltage to the chip, thereby further improving the protection of the workpiece to be soldered during automatic pin pressing. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial structural schematic diagram of the present invention for removing the vacuum chamber;

[0019] Figure 3 This is a utility model Figure 2 A schematic diagram of the structure with part of the pressure needle assembly removed;

[0020] Figure 4 This is a utility model Figure 3 Enlarged detail view of point A in the middle;

[0021] Figure 5 This is a utility model Figure 3 A magnified view of the details at point B in the middle.

[0022] In the diagram: 1. Support platform; 2. Lifting assembly; 21. Synchronous lifter; 22. Coupling; 23. Lifting motor; 24. Reducer; 3. Limit assembly; 31. Side plate; 32. Side frame; 33. Bottom limit switch; 34. Top limit switch; 35. Through hole; 36. Contact; 4. Lifting rod; 5. Pressure needle plate; 6. Pressure needle assembly; 61. Pressure needle seat; 62. Pressure needle spring; 63. Pressure needle; 7. Welding table; 8. Welding workpiece tray; 81. Chip; 82. Lead wire frame; 9. Vacuum chamber; 10. Vacuum chamber cover; 11. Support column; 12. Origin switch. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] like Figures 1 to 5As shown, an automatic pin clamping mechanism for clamping and fixing welded parts in a vacuum welding furnace includes a support platform 1. A lifting assembly 2 is installed at the bottom of the support platform 1. The lifting assembly 2 includes four synchronous lifters 21. A limiting assembly 3 is installed between the bottom of one synchronous lifter 21 and the support platform 1. The limiting assembly 3 is used to limit the moving height of the synchronous lifter 21. A lifting rod 4 is installed at the top of the synchronous lifter 21. A pin clamping plate 5 is installed between the tops of each lifting rod 4. Pin clamping assemblies 6 are evenly arranged at the top of the pin clamping plate 5. A welding table 7 is fixedly connected to the top of the support platform 1. A workpiece tray 8 is placed at the top of the welding table 7. Chips 81 are evenly arranged at the top of the workpiece tray 8. A lead frame 82 is placed between the tops of each chip 81. The pin clamping assembly 6 is used to clamp the chips 81 and lead frame 82 in the workpiece tray 8.

[0025] It should be noted that a vacuum chamber 9 is installed on the outer side of the top of the support platform 1 (see...). Figure 1 The top of the vacuum chamber 9 is rotatably connected to the vacuum chamber cover 10. An opening is provided on one side of the vacuum chamber 9 to push the pre-positioned chip 81 and lead frame 82 into the top of the welding station 7 and position them inside the vacuum chamber 9. Then, preparations are made for the pressing and welding of the pin assembly 6. The entire equipment is located inside the vacuum furnace, and the bottom surfaces of the vacuum chamber cover 10 move away from each other when the pin plate 5 moves to its highest position to avoid collision.

[0026] like Figure 2 and Figure 3 As shown, four support columns 11 are installed at the bottom of the support platform 1, and synchronous lifters 21 are installed at the bottom of the support columns 11. The lifting assembly 2 also includes a coupling 22 installed between two adjacent synchronous lifters 21. Each synchronous lifter 21 is located on the same horizontal plane. A lifting motor 23 is installed on one side of one of the synchronous lifters 21, and a reducer 24 is set on one side of the lifting motor 23. The output end of the reducer 24 is connected to the adjacent synchronous lifter 21, and the top of the synchronous lifter 21 is fixedly connected to the lifting rod 4.

[0027] It should be noted that the support column 11 has a hollow structure and a vertical slot is opened inside the installation position of the synchronous lifter 21. The lifting rod 4 built into the support column 11 is fixedly connected through the slot. In use, the lifting motor 23 reverses through the reducer 24. The reducer 24 rotates and drives the synchronous lifter 21 connected to it to move vertically. The synchronous lifter 21 then drives the other three synchronous lifters 21 to move synchronously through the coupling 22. The pressure needle plate 5 installed between the tops of each lifting rod 4 moves vertically, driving each pressure needle assembly 6 to move vertically and press against the welding tray 8.

[0028] like Figure 3 and Figure 4As shown, the limiting component 3 includes a side plate 31 disposed on one side of the bottom of one of the synchronous lifters 21. Two side brackets 32 are installed on one side of the side plate 31. A bottom limit switch 33 is installed on one side of the side bracket 32 ​​at the bottom end, and a top limit switch 34 is installed on one side of the side bracket 32 ​​at the top. A through hole 35 is adapted to be opened on one side of the support column 11. Contact points 36 are provided at the bottom and top of the through hole 35.

[0029] It should be noted that when the lifting assembly 2 is raising or lowering its height, it drives the side plate 31 to move vertically. When the lifting motor 23 moves upward, the top limit switch 34 contacts the top contact 36, and the lifting motor 23 stops moving upward. When the lifting motor 23 moves downward, the bottom limit switch 33 contacts the bottom contact 36, and the lifting motor 23 also stops moving downward. The purpose is to limit the upper and lower limits of the movement of the equipment by setting the limit assembly 3, so as to avoid collision with the vacuum chamber cover 10 during the upward movement and to avoid the problem of overpressure of the needle pressing assembly 6 on the welding tray 8 during the downward movement. That is, it is used to protect the equipment and chip 81 in the automatic needle pressing process. In addition, the origin switch 12 is installed on one side of the side plate 31. The origin switch 12 is electrically connected to the lifting assembly 2 and is used to start and stop the lifting assembly 2.

[0030] like Figure 3 and Figure 5 As shown, the needle assembly 6 includes three needle seats 61 mounted on the top of the needle plate 5. A needle spring 62 is fixedly connected to the bottom of the needle seat 61. A needle 63 is fixedly connected to the bottom of the needle spring 62. The top of the needle 63 is slidably connected to the needle seat 61. Each needle 63 is located on a different side of the top of the lead frame 82.

[0031] It should be noted that when the lifting component 2 moves the pressure pin disk 5 vertically, a single pressure pin component 6 presses against the lead frame 82. Due to the different contact heights between the top of each side of the chip 81 and the lead frame 82, after the pressure pin 63 presses the side of the lead frame 82 closest to the chip 81, the side of the chip 81 farther from the lead frame 82 remains uncontacted. At this time, under the pre-protection of the limiting component 3 to prevent overpressure, the lifting component 2 continues to press down. The already pressed pressure pin 63 compresses the pressure pin spring 62 to avoid overpressure on the chip 81, while the unpressed pressure pin 63 changes from an unpressed state to a pressed state. This achieves the automatic pressing function of the solder joints of the chip 81 at different heights while protecting the chip 81, avoiding the problem of cold solder joints during subsequent soldering.

[0032] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An automatic pressing pin mechanism for pressing and fixing welded products in a vacuum welding furnace, comprising a support platform (1), characterized in that, The support platform (1) is equipped with a lifting assembly (2) at its bottom. The lifting assembly (2) includes four synchronous lifters (21). One of the synchronous lifters (21) is equipped with a limit assembly (3) between its bottom and the support platform (1). The limit assembly (3) is used to limit the moving height of the synchronous lifter (21). The synchronous lifter (21) is equipped with a lifting rod (4) at its top. A pressure needle plate (5) is installed between the tops of each lifting rod (4). Pressure needle assemblies (6) are evenly arranged at the top of the pressure needle plate (5). A welding table (7) is fixedly connected to the top of the support platform (1). A welding tray (8) is placed at the top of the welding table (7). Chips (81) are evenly arranged at the top of the welding tray (8). A lead frame (82) is placed between the tops of each chip (81). The pressure needle assembly (6) is used to press the chip (81) and the lead frame (82) together.

2. The automatic pressing pin mechanism for pressing and fixing welded products in a vacuum welding furnace according to claim 1, characterized in that, The support platform (1) has four support columns (11) installed at its bottom. The synchronous lifter (21) is installed at the bottom of the support column (11). The lifting assembly (2) also includes a coupling (22) installed between two adjacent synchronous lifters (21). Each synchronous lifter (21) is located on the same horizontal plane. A lifting motor (23) is installed on one side of one of the synchronous lifters (21). A reducer (24) is provided on one side of the lifting motor (23). The output end of the reducer (24) is connected to the adjacent synchronous lifter (21).

3. The automatic pressing pin mechanism for pressing and fixing welded products in a vacuum welding furnace according to claim 2, characterized in that, The limiting component (3) includes a side plate (31) disposed on one side of the bottom of one of the synchronous lifters (21). Two side frames (32) are installed on one side of the side plate (31). A bottom limit switch (33) is installed on one side of the side frame (32) at the bottom end, and a top limit switch (34) is installed on one side of the other side frame (32). A through hole (35) is opened on one side of the support column (11). Contact points (36) are provided at the bottom and top of the through hole (35).

4. The automatic pressing pin mechanism for pressing and fixing welded products in a vacuum welding furnace according to claim 3, characterized in that, A origin switch (12) is installed on one side of the side plate (31), and the origin switch (12) is electrically connected to the lifting assembly (2).

5. The automatic pressing pin mechanism for pressing and fixing welded products in a vacuum welding furnace according to claim 1, characterized in that, The pressure needle assembly (6) includes three pressure needle seats (61) installed on the top of the pressure needle plate (5). A pressure needle spring (62) is fixedly connected to the bottom of the pressure needle seat (61). A pressure needle (63) is fixedly connected to the bottom of the pressure needle spring (62). The top of the pressure needle (63) is slidably connected to the pressure needle seat (61). Each pressure needle (63) is located on a different side of the top of the lead frame (82).

6. The automatic pressing pin mechanism for pressing and fixing welded products in a vacuum welding furnace according to claim 1, characterized in that, A vacuum chamber (9) is installed on the outer side of the top of the support platform (1). A vacuum chamber cover plate (10) is rotatably connected to the top of the vacuum chamber (9). The bottom surface of the vacuum chamber cover plate (10) is separate from the top of the pressure needle plate (5).

Images