Vacuum welding tool for power module

Abstract

The utility model relates to a power module vacuum welding tool which comprises a tray, a first stand column, a limiting middle frame, a plurality of pin counterweight columns and counterweight sheets, a welding base plate is placed on the tray, a template is placed on the welding base plate, a plurality of pins are arranged on the template, the limiting middle frame is located above the welding base plate, a plurality of pin corresponding holes are formed in the limiting middle frame, and the pin counterweight columns and the counterweight sheets are arranged on the first stand column. The first stand column is located between the limiting middle frame and the welding base plate and arranged close to the outer edge, the pins extend into the pin corresponding holes, the multiple pin balance weight columns are arranged on the upper surface of the limiting middle frame and cover upper openings of the multiple pin corresponding holes, the weight stacks are placed on the upper surfaces of the multiple pin balance weight columns, and through cooperation of the limiting middle frame, the first stand column and the pin balance weights, the weight stacks are arranged on the upper surfaces of the multiple pin balance weight columns. According to the pin counter weight device, the pins are fixed through primary counter weight, after the pins are fixed in place, counter weight pieces are placed above the multiple pin counter weight columns for secondary counter weight, the pins subjected to tin prefabrication cannot be damaged, it is guaranteed that all the pins are stressed consistently, and the counter weight weight can be adjusted according to the actual situation.

Description

Technical Field

[0001] This utility model belongs to the field of power module welding fixture technology, specifically relating to a power module vacuum welding fixture. Background Technology

[0002] Current vacuum soldering fixtures use counterweight fixing blocks to secure the counterweight, which is then fixed to a tray by multiple parts before entering the soldering furnace. This fixture has the following disadvantages: 1. Using counterweight fixing blocks for securing the counterweight is cumbersome to disassemble and handle, wasting time and resources. 2. Uneven counterweight distribution leads to uneven soldering, leaving voids at the solder joints and causing defects. 3. Excessive counterweight can damage the PIN pins after pre-soldering, resulting in defects. To address these issues, this solution was developed. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a vacuum welding fixture for power modules, whose counterweight is easy to disassemble and assemble.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a power module vacuum welding fixture, including a tray, a first column, a limiting frame, multiple pin counterweight columns and counterweight plates. A welding substrate is placed on the tray, a template is placed on the welding substrate, and the template has multiple pins. The limiting frame is located above the welding substrate, and multiple pin corresponding holes are formed on the limiting frame. The first column is located between the limiting frame and the welding substrate and is set near the outer edge. The pins extend into the pin corresponding holes. Multiple pin counterweight columns are arranged on the upper surface of the limiting frame and cover the openings of the multiple pin corresponding holes. The counterweight plates are placed on the upper surface of the multiple pin counterweight columns.

[0005] Furthermore, the pin counterweight column includes a column body and an adjusting rod. A first screw hole is formed on the upper surface of the column body, and an external thread is formed on the outer circumferential surface of the lower end of the adjusting rod. The lower end of the adjusting rod is screwed into the first screw hole.

[0006] Furthermore, the power module vacuum welding fixture also includes two U-shaped limiting frames, which are disposed on both sides of the upper surface of the welding substrate and face each other, with the first column in contact with the upper surface of the U-shaped limiting frames.

[0007] Furthermore, the upper surface of the limiting frame is formed with multiple positioning bosses, and the multiple positioning bosses correspond to multiple pin corresponding holes. The pin corresponding holes extend through to the upper surface of the positioning bosses, and the pin counterweight column is placed on the upper surface of the positioning bosses.

[0008] Furthermore, the power module vacuum welding fixture also includes a limiting upper frame and a second column. The limiting upper frame has a plurality of first limiting holes, which correspond to a plurality of adjusting rods respectively. The adjusting rods pass through their corresponding first limiting holes respectively. The second column is located between the limiting upper frame and the limiting middle frame and is set near the outer edge.

[0009] Furthermore, at least two diagonally arranged positioning posts are formed on the upper surface of the limiting frame, and second limiting holes are formed at two diagonal points on the upper surface of the counterweight plate, the second limiting holes being adapted to the positioning posts.

[0010] Furthermore, the welding substrate is provided with three templates, which are spaced apart, and the U-shaped limiting frame forms limiting protrusions on the three sides facing the templates.

[0011] Furthermore, the U-shaped limiting frame has a limiting protrusion on its side facing the template, and the limiting protrusion extends between the two templates.

[0012] Furthermore, a plate is provided on the lower surface of the limiting frame. The plate has the same shape as the limiting frame and has through holes corresponding to the pin holes. The plate and the limiting frame are detachably connected.

[0013] Furthermore, the upper surface of the tray is an arc surface that is lower in the middle and higher on both sides.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In this utility model, the pin is fixed by the first counterweight through the cooperation of the limiting frame, the first column and the pin counterweight. After the pin is fixed in place, a counterweight plate is placed on top of the multiple pin counterweight columns for secondary counterweighting. This will not damage the pin after the pre-tinning and ensures that the force on each pin is consistent. The counterweight weight can be adjusted according to the actual situation.

[0016] 2. Compared with the existing method of fixing the counterweight with a counterweight fixing block, the pin counterweight and counterweight plate provided in this solution are easy to disassemble and assemble. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a power module vacuum welding fixture according to the present invention;

[0018] Figure 2 This is a front view structural diagram of the present utility model;

[0019] Figure 3 This is a top view of the U-shaped limiting frame in this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the pin counterweight column in this utility model.

[0021] The markings in the diagram are: 1. Upper limiting frame; 11. Positioning post; 2. Second column; 3. U-shaped limiting frame; 31. Limiting protrusion; 32. Limiting strip; 4. Tray; 5. First column; 6. Middle limiting frame; 61. Boss; 62. Plate; 63. L-shaped connecting plate; 7. Pin counterweight column; 71. Column; 72. Adjusting rod; 73. Operating head; 8. Counterweight plate; 9. Welding substrate; 91. Template. Detailed Implementation

[0022] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0023] like Figures 1-4 As shown, this embodiment provides a power module vacuum welding fixture, including a limiting upper frame 1, a second column 2, two U-shaped limiting frames 3, a tray 4, a first column 5, a limiting middle frame 6, multiple pin counterweight columns 7 and counterweight plates 8.

[0024] A welding substrate 9 is placed on a tray 4. The upper surface of the tray 4 is an arc surface that is lower in the middle and higher on both sides. The tray 4 has a through hole in the middle, and the pins on the lower surface of the welding substrate 9 are located in the through hole. A template 91 is placed on the welding substrate 9. In this embodiment, there are three templates 91, which are spaced apart. Each template 91 has multiple pins.

[0025] The limiting frame 6 is located above the welding substrate 9. The limiting frame 6 has three corresponding holes, which correspond to three templates 91 respectively. The first pillar 5 is located between the limiting frame 6 and the welding substrate 9 and is set near the outer edge. Specifically, the U-shaped limiting frame 3 is set on both sides of the upper surface of the welding substrate 9 and is arranged opposite to each other. The first pillar 5 is in contact with the upper surface of the U-shaped limiting frame 3. There are four first pillars 5 set at the four diagonal corners of the welding substrate 9. The limiting frame 6 has multiple pin corresponding holes. Specifically, the upper surface of the limiting frame 6 has multiple positioning bosses 61, which correspond to multiple pin corresponding holes. The pin corresponding holes extend through to the upper surface of the positioning bosses 61. The pins extend into the pin corresponding holes and their upper ends are at least flush with the surface of the pin corresponding holes. Multiple pin counterweight pillars 7 are set on the upper surface of the positioning bosses 61 and cover the openings of the multiple pin corresponding holes. The pins are fixed by the multiple pin counterweight pillars 7 pressing against the pins.

[0026] The pin counterweight column 7 includes a column body 71 and an adjusting rod 72. A first screw hole is formed on the upper surface of the column body 71, and an external thread is formed on the outer circumferential surface of the lower end of the adjusting rod 72. The lower end of the adjusting rod 72 is screwed into the first screw hole. When the pin is placed on the template 91, the upper end surfaces of the adjusting rods 72 of multiple pins may be uneven. By rotating the adjusting rod 72, the height of the upper surface of the adjusting rod 72 is adjusted so that the height of all adjusting rods 72 is consistent, which makes it convenient for the counterweight plate 8 to be placed on the adjusting rod 72 and evenly distribute the weight to each pin. An operating head 73 is also provided at the end of the pin. The diameter of the operating head 73 is larger than that of the adjusting rod 72.

[0027] Preferably, the three sides of the U-shaped limiting frame 3 facing the template 91 form limiting protrusions 31. The limiting protrusions 31 limit the placement position of the template 91. The sides of the U-shaped limiting frame 3 facing the template 91 form limiting strips 32. The limiting strips 32 extend between two templates 91. The limiting strips 32 block two adjacent templates 91 and control the distance between two adjacent templates 91.

[0028] Preferably, a plate 62 is also provided on the lower surface of the limiting frame 6. The plate 62 has the same shape as the limiting frame 6. Through holes corresponding to the pin holes are formed on the plate 62. The plate 62 and the limiting frame 6 can be detachably connected. Specifically, L-shaped connecting plates 63 are provided on both sides of the plate 62. The lower surface of the plate 62 is supported on the short side of the L-shaped connecting plate 63. The L-shaped connecting plate 63 is connected to the limiting frame 6 by screws, or one end of the L-shaped connecting plate 63 is connected to the limiting frame 6 by screws, and the other end abuts against the welding substrate 9 through a support column.

[0029] The upper limiting frame 1 has multiple first limiting holes, which correspond to multiple adjusting rods 72. The adjusting rods 72 pass through their corresponding first limiting holes. The second column 2 is located between the upper limiting frame 1 and the middle limiting frame 6 and is set near the outer edge. The upper limiting frame 1 is also provided with connecting screws. The connecting screws pass through the upper limiting frame 1, the second column 2, and the middle limiting frame 6 and are screwed into the first column 5. The upper surface of the upper limiting frame 1 also has three sets of positioning columns 11, each set consisting of 4 columns arranged in a matrix. The three sets correspond to three templates 91. The upper surface of the counterweight plate 8 has four diagonal second limiting holes, which are adapted to the positioning columns 11. The setting of the positioning columns 11 makes it easier to place the counterweight plate 8.

[0030] This solution uses the combination of the limiting frame 6, the first column 5, and the pin counterweight to achieve primary counterweight fixation of the pin. After the pin is fixed in place, a counterweight plate 8 is placed on top of multiple pin counterweight columns 7 for secondary counterweighting. This will not damage the pin after pre-soldering and ensures that the force on each pin is consistent. The counterweight weight can be adjusted according to the actual situation. Compared with the existing counterweight fixing block method, the pin counterweight and counterweight plate 8 provided in this solution are simple to install and remove.

[0031] The foregoing has shown and described the basic principles and main features of this invention, as well as its advantages. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope. All such changes and modifications fall within the scope of this invention as defined by the appended claims and their equivalents.

Claims

1. A vacuum welding fixture for power modules, characterized in that: The device includes a tray, a first column, a limiting frame, multiple pin counterweight columns, and a counterweight plate. A welding substrate is placed on the tray, and a template is placed on the welding substrate. The template has multiple pins. The limiting frame is located above the welding substrate and has multiple pin corresponding holes. The first column is located between the limiting frame and the welding substrate and is positioned near the outer edge. The pins extend into the pin corresponding holes. Multiple pin counterweight columns are disposed on the upper surface of the limiting frame and cover the openings of the multiple pin corresponding holes. The counterweight plate is placed on the upper surface of the multiple pin counterweight columns.

2. The power module vacuum welding fixture according to claim 1, characterized in that: The pin counterweight column includes a column body and an adjusting rod. A first screw hole is formed on the upper surface of the column body, and an external thread is formed on the outer circumferential surface of the lower end of the adjusting rod. The lower end of the adjusting rod is screwed into the first screw hole.

3. The power module vacuum welding fixture according to claim 1, characterized in that: The power module vacuum welding fixture also includes two U-shaped limiting frames, which are arranged on both sides of the upper surface of the welding substrate and facing each other. The first column is in contact with the upper surface of the U-shaped limiting frame.

4. The power module vacuum welding fixture according to claim 1, characterized in that: The upper surface of the limiting frame has multiple positioning bosses, and the multiple positioning bosses correspond to multiple pin corresponding holes. The pin corresponding holes extend through to the upper surface of the positioning bosses, and the pin counterweight column is placed on the upper surface of the positioning bosses.

5. The power module vacuum welding fixture according to claim 2, characterized in that: The power module vacuum welding fixture also includes a limiting upper frame and a second column. The limiting upper frame has a plurality of first limiting holes, which correspond to a plurality of adjusting rods respectively. The adjusting rods pass through their corresponding first limiting holes. The second column is located between the limiting upper frame and the limiting middle frame and is set near the outer edge.

6. The power module vacuum welding fixture according to claim 5, characterized in that: The upper surface of the limiting frame is also provided with at least two diagonally arranged positioning posts, and the upper surface of the counterweight plate is provided with two diagonally arranged second limiting holes, which are adapted to the positioning posts.

7. The power module vacuum welding fixture according to claim 3, characterized in that: The welding substrate is provided with three templates, which are spaced apart, and the U-shaped limiting frame forms limiting protrusions on the three sides facing the templates.

8. The power module vacuum welding fixture according to claim 7, characterized in that: The U-shaped limiting frame has a limiting protrusion on its side facing the template, and the limiting protrusion extends between the two templates.

9. The power module vacuum welding fixture according to claim 1, characterized in that: The lower surface of the limiting frame is also provided with a plate, the plate having the same shape as the limiting frame, and through holes corresponding to the pin holes formed on the plate. The plate and the limiting frame are detachably connected.

10. A vacuum welding fixture for power modules according to claim 1, characterized in that: The upper surface of the tray is an arc surface that is lower in the middle and higher on both sides.

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