Chip-type heat sink welding tool and method thereof

Abstract

The application discloses a sheet type radiator welding tool, which comprises a base, a clamping mechanism arranged on the top of the base, the clamping mechanism comprising two oppositely arranged connecting frames, the two connecting frames being configured to be capable of moving close to or away from each other to adapt to radiators of different widths, a plurality of moving plates being slidably connected to the interiors of the two connecting frames, the moving plates being arranged along the vertical direction, each moving plate being fixedly connected with a plurality of clamping blocks on the side close to the other connecting frame, each clamping block being elastically slidably connected with a first clamping plate through a first guide rod, and a first spring being sleeved on the first guide rod, wherein the elastic clamping unit formed by the first clamping plate, the first guide rod and the first spring enables each clamping block to independently adapt to the thickness tolerance of the radiating fins, no matter how thick or thin the radiating fins are, the first spring can provide a pre-tightening force, thereby avoiding local stress concentration and deformation caused by rigid clamping and effectively ensuring the adhesion of the welding surface.

Description

Technical Field

[0001] This invention belongs to the field of welding equipment technology, and specifically relates to a welding fixture and method for a plate-type heat sink. Background Technology

[0002] Plate-type radiators are widely used in power transformers, new energy charging piles and high-power frequency converters. They are mainly used for heat dissipation in oil-cooled or air-cooled systems. Traditional plate-type radiators are usually made of multiple layers of heat dissipation fins welded together with oil collection pipes.

[0003] In existing welding processes, the following fixing methods are commonly used: using ordinary vises or rigid clamps to hold the heat sink fins. Due to the thickness tolerance or warping deformation of the heat sink fins themselves, rigid clamps can easily lead to uneven force on the contact surface. Thin areas are clamped too tightly, causing deformation, while thick areas are left with gaps, which seriously affects the welding quality. For irregularly shaped or large heat sinks, workers often rely on manual support and use shims to adjust the height. This method is not only inefficient, but also makes it difficult to control thermal deformation during the welding process, resulting in poor flatness of the finished product. Existing special tooling usually can only be used for heat sinks of a single specification. When it is necessary to change to products with different widths or layers, it is necessary to remake the tooling or spend a lot of time adjusting the shims, which cannot meet the needs of flexible production. Summary of the Invention

[0004] The purpose of this invention is to provide a welding fixture and method for a plate heat sink in order to solve the above problems. By setting up an elastic clamping unit consisting of a first clamping plate, a first guide rod and a first spring, each clamping block can independently adapt to the thickness tolerance of the heat sink. Regardless of the thickness of the heat sink, the first spring can provide a preload force, avoiding local stress concentration and deformation caused by rigid clamping, and effectively ensuring the fit of the welding surface.

[0005] By using a two-way lead screw to drive the two connecting frames to move synchronously in opposite directions, the heat sink can be automatically aligned in the width direction. At the same time, with the No. 2 clamping plates and No. 2 springs at the upper and lower ends of the connecting frames, the upper and lower end faces of the heat sink are pressed together. This three-dimensional constraint mechanism of "up and down + left and right" effectively prevents thermal displacement during the welding process and greatly improves the assembly accuracy.

[0006] By rotating the screw to drive the moving plate to slide on the No. 3 guide rod, the layer spacing between adjacent clamping blocks can be flexibly adjusted. This allows the tooling to adapt to heat sink products with different numbers of fins and different layer heights, enabling quick changeover without changing the mold and reducing tooling costs.

[0007] The ball bearing support plate in the middle of the base transforms traditional sliding friction into rolling friction when supporting the bottom of the radiator. This not only makes it easier for workers to fine-tune the position of the radiator before welding, but also releases some thermal stress during the welding process, preventing the workpiece from jamming.

[0008] By linking and controlling all moving plates on the same side with connecting ropes, and combined with the support wheel design at the bottom of the slider, the opening, closing and adjustment of the tooling is more labor-saving and quick, significantly shortening the clamping waiting time and improving the efficiency of mass production.

[0009] To address the above problems, the present invention provides a technical solution: A welding fixture for a plate-type heat sink includes a base, and a clamping mechanism is provided on the top of the base. The clamping mechanism includes two oppositely arranged connecting frames, which are configured to move closer to or further away from each other to accommodate heat sinks of different widths. Both of the connecting frames have several movable plates slidably connected inside. The movable plates are arranged vertically. Each movable plate has several clamping blocks fixedly connected to one side of the other connecting frame. Each clamping block has a clamping plate elastically slidably connected to both sides of the clamping block via a guide rod. A spring is sleeved on the guide rod, and the two ends of the spring abut against the clamping block and the clamping plate, respectively.

[0010] As a preferred embodiment of the present invention, a sliding groove is provided at the top center of the base, and a bidirectional lead screw is rotatably connected in the sliding groove. The two ends of the bidirectional lead screw are threadedly connected to sliders, which slide in cooperation with the sliding groove, and the tops of the two sliders are respectively fixedly connected to the bottoms of the two connecting frames.

[0011] As a preferred embodiment of the present invention, a support component is provided at the top of the base and on the moving path of the connecting frame. The support component includes a limiting guide rail opened at the top of the base, and a support wheel is rolled inside the limiting guide rail. The support wheel is rotatably connected to the bottom of the connecting frame.

[0012] As a preferred embodiment of the present invention, the two connecting frames are provided with second clamping plates at their upper and lower ends on the side close to each other. A T-shaped guide rod is fixedly connected to the side of the second clamping plate close to the connecting frame. A through hole is provided on the connecting frame for the T-shaped guide rod to pass through. A second spring is sleeved on the T-shaped guide rod. The two ends of the second spring abut against the second clamping plate and the connecting frame, respectively.

[0013] As a preferred embodiment of the present invention, a screw is rotatably connected to the middle of each of the two connecting frames. The screw is threadedly connected to a movable plate located at the outermost edge. A third guide rod is fixedly connected inside the connecting frame and on both sides of the screw. The third guide rod is slidably inserted into the movable plate.

[0014] As a preferred embodiment of the present invention, a support plate is fixedly connected to one side of each of the two sliders that are close to each other. A plurality of balls are rotatably connected to the top of the support plate. The plurality of balls are equidistant and staggered to support the heat dissipation tube to be welded.

[0015] As a preferred embodiment of the present invention, the tops of several movable plates inside the same connecting frame are fixedly connected with connecting ropes for linkage control of the position of the movable plates.

[0016] A method for using the welding fixture described above includes the following steps: S1. Width Adjustment: Rotate the two-way lead screw to move the two connecting frames closer or further apart along the slide groove, adjusting to fit the overall width of the finned heat sink. S2, Longitudinal pre-tightening: Rotate the screw, guided by the No. 3 guide rod, to drive the moving plate and clamping block to move in the vertical direction, so that the No. 1 clamping plate initially fits against the surface of the radiator; S3, Elastic Clamping: Under the elastic force of the first spring, the first clamping plate adapts to the extension and retraction of the first guide rod to flexibly clamp the heat sinks of different thicknesses. At the same time, the second clamping plate presses the upper and lower ends of the heat sink under the action of the second spring. S4. Welding operation: After the workpiece is fixed, use the ball bearings on the support plate to support the welding gun or workpiece and perform full welding or spot welding. After welding is completed, loosen the clamps and take out the finished product.

[0017] As a preferred technical solution of the present invention, the above is described.

[0018] The beneficial effects of this invention are as follows: By setting up an elastic clamping unit consisting of a No. 1 clamping plate, a No. 1 guide rod, and a No. 1 spring, each clamping block can independently adapt to the thickness tolerance of the heat sink. Regardless of the thickness of the heat sink, the No. 1 spring can provide a preload force, avoiding local stress concentration and deformation caused by rigid clamping, and effectively ensuring the fit of the welding surface.

[0019] By using a two-way lead screw to drive the two connecting frames to move synchronously in opposite directions, the heat sink can be automatically aligned in the width direction. At the same time, with the No. 2 clamping plates and No. 2 springs at the upper and lower ends of the connecting frames, the upper and lower end faces of the heat sink are pressed together. This three-dimensional constraint mechanism of "up and down + left and right" effectively prevents thermal displacement during the welding process and greatly improves the assembly accuracy.

[0020] By rotating the screw to drive the moving plate to slide on the No. 3 guide rod, the layer spacing between adjacent clamping blocks can be flexibly adjusted. This allows the tooling to adapt to heat sink products with different numbers of fins and different layer heights, enabling quick changeover without changing the mold and reducing tooling costs.

[0021] The ball bearing support plate in the middle of the base transforms traditional sliding friction into rolling friction when supporting the bottom of the radiator. This not only makes it easier for workers to fine-tune the position of the radiator before welding, but also releases some thermal stress during the welding process, preventing the workpiece from jamming.

[0022] By linking and controlling all moving plates on the same side with connecting ropes, and combined with the support wheel design at the bottom of the slider, the opening, closing and adjustment of the tooling is more labor-saving and quick, significantly shortening the clamping waiting time and improving the efficiency of mass production. Attached Figure Description

[0023] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the base structure of the present invention; Figure 3 This is a schematic diagram of the connecting frame of the present invention; Figure 4 This is a schematic diagram of the connection structure of the third guide rod of the present invention; Figure 5 This is a schematic diagram of the clamping block of the present invention.

[0025] In the diagram: 1. Base; 2. Slide groove; 3. Slider; 4. Two-way lead screw; 5. Connecting frame; 6. Limiting guide rail; 7. Support wheel; 8. Support plate; 9. Ball bearing; 10. Moving plate; 11. Clamping block; 12. Clamping plate No. 1; 13. Guide rod No. 1; 14. Spring No. 1; 15. Clamping plate No. 2; 16. T-shaped guide rod; 17. Spring No. 2; 18. Screw; 19. Guide rod No. 3; 20. Connecting rope. Detailed Implementation

[0026] Example 1: A welding fixture for a plate-type heat sink like Figure 1-5 As shown, the specific embodiment adopts the following technical solution: a welding fixture for a plate heat sink, which solves the problem that the existing fixture cannot adapt to the thickness of the heat sink and is inconvenient to adjust. The fixture specifically includes a base 1, a width adjustment mechanism, a clamping mechanism and a support mechanism.

[0027] The base 1 serves as a supporting body, and a groove 2 is provided at the center of its top. A bidirectional lead screw 4 is rotatably connected inside the groove 2. The two ends of the bidirectional lead screw 4 have opposite threads and are each threadedly connected to a slider 3. When the bidirectional lead screw 4 is rotated, the two sliders 3 will move synchronously in opposite directions inside the groove 2, thereby realizing the opening and closing of the tooling.

[0028] To enhance the stability of long-stroke movement, a limiting guide rail 6 is provided at the top of the base 1 and below the connecting frame 5. Support wheels 7 are rotatably connected to the bottom of both ends of the connecting frame 5. The support wheels 7 are rolled within the limiting guide rail 6, forming a stable support structure together with the slider 3.

[0029] Two connecting frames 5 are fixed to the top of two sliders 3 respectively. The connecting frame 5 is a vertical frame structure, and several movable plates 10 are slidably connected inside it. In the same connecting frame 5, the tops of all movable plates 10 are connected in series by a connecting rope 20, so that pulling the connecting rope 20 can pull all movable plates 10 simultaneously, which facilitates the quick removal and placement of the heat sink.

[0030] Each movable plate 10 has several clamping blocks 11 fixedly connected to one side near the center. A guide rod 13 is inserted into both sides of the clamping block 11. A clamping plate 12 is fixedly connected to the end of the guide rod 13 away from the clamping block 11. A spring 14 is sleeved on the guide rod 13. When the heat sink is placed, the heat sink squeezes the clamping plate 12, and the spring 14 is further compressed. The spring force adaptively clamps heat sinks of different thicknesses.

[0031] In addition, a screw 18 is rotatably connected to the middle of each of the two connecting frames 5. The screw 18 is threadedly connected to the outermost movable plate 10. Inside the connecting frame 5, there are three guide rods 19 located on both sides of the screw 18. By rotating the screw 18, the height position of the outermost movable plate 10 can be precisely controlled, thereby adjusting the layer spacing of the entire row of clamping blocks 11 to accommodate heat sink assemblies of different heights.

[0032] To prevent the heat sink from warping during welding, two clamping plates 15 are provided at the upper and lower ends of the two connecting frames 5 on the side closest to each other. The clamping plates 15 are inserted into the connecting frames 5 through T-shaped guide rods 16 and are fitted with springs 17. During the clamping process, the two clamping plates 15 will first contact the upper and lower edges of the heat sink and flatten it under the action of springs 17.

[0033] Meanwhile, a support plate 8 is fixedly connected to the side of each of the two sliders 3 that are close to each other. Several balls 9 are embedded in the top of the support plate 8 and rotated. These balls 9 are equidistant and staggered. When the heat sink is placed on the support plate 8, the balls 9 play the role of rolling support, which is convenient for fine adjustment of position and can reduce frictional resistance during welding.

[0034] Example 2: A method of using the above-mentioned tooling S1, Width Adjustment and Centering Based on the overall width of the finned heat sink to be welded, the operator rotates the double-acting screw 4. The double-acting screw 4 drives the two sliders 3 and the connecting frame 5 to move along the slide groove 2 until the distance between the clamping blocks 11 on both sides is slightly greater than the width of the heat sink. At this time, the support wheel 7 rolls in the limit guide rail 6 to ensure that the connecting frame 5 moves smoothly.

[0035] S2, Vertical layer spacing adjustment Based on the number and height of the heat sink, rotate the screw 18 in the middle of the connecting frame 5. The screw 18 drives the moving plate 10 to slide up and down along the third guide rod 19, thereby adjusting the distance between the adjacent clamping blocks 11 to match the spacing between the heat sink fins.

[0036] S3, Clamping and Self-Adaptive Locking Pull the connecting rope 20 to move all the moving plates 10, and insert the multi-layer heat sink into the space between the upper and lower No. 1 clamping plates 12. After releasing the connecting rope 20, under the elastic force of the No. 1 spring 14, the No. 1 clamping plate 12 applies a horizontal clamping force to the heat sink, adaptively compensating for the thickness tolerance of the heat sink. At the same time, the No. 2 clamping plate 15 located at the upper and lower ends of the connecting frame 5, under the action of the No. 2 spring 17, presses the upper and lower end faces of the heat sink, completing the all-round fixation.

[0037] S4. Welding operations and material preparation The bottom of the radiator is placed on the ball bearings 9 of the support plate 8 for welding. During welding, the heat generated causes slight deformation of the workpiece, and the ball bearings 9 allow for minute expansion and contraction of the workpiece, preventing stress concentration. After welding, the double-acting screw 4 is rotated in the opposite direction to loosen the fixture, and the finished product is removed.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A welding fixture for a plate-type heat sink, characterized in that, Includes a base (1), the top of which is provided with a clamping mechanism, the clamping mechanism including two oppositely arranged connecting frames (5), the two connecting frames (5) are configured to be able to move closer or further apart to accommodate heat sinks of different widths; Both of the connecting frames (5) have several movable plates (10) slidably connected inside. The movable plates (10) are arranged vertically. Each movable plate (10) has several clamping blocks (11) fixedly connected to one side of the other connecting frame (5). Each clamping block (11) has a clamping plate (12) elastically slidably connected to both sides of the clamping block (11) through a guide rod (13). A spring (14) is sleeved on the guide rod (13). The two ends of the spring (14) abut against the clamping block (11) and the clamping plate (12) respectively.

2. The welding fixture for a plate-type heat sink according to claim 1, characterized in that: The base (1) has a groove (2) at the top center. A two-way screw (4) is rotatably connected in the groove (2). The two ends of the two-way screw (4) are threaded with sliders (3). The sliders (3) slide in the groove (2), and the tops of the two sliders (3) are fixedly connected to the bottoms of the two connecting frames (5).

3. The welding fixture for a plate-type heat sink according to claim 1, characterized in that: A support component is provided on the top of the base (1) and on the moving path of the connecting frame (5). The support component includes a limiting guide rail (6) opened on the top of the base (1). A support wheel (7) is rolled inside the limiting guide rail (6). The support wheel (7) is rotatably connected to the bottom of the connecting frame (5).

4. The welding fixture for a plate-type heat sink according to claim 1, characterized in that: Two clamping plates (15) are provided at the upper and lower ends of the two connecting frames (5) on the side close to each other. A T-shaped guide rod (16) is fixedly connected to the side of the clamping plate (15) close to the connecting frame (5). A through hole is provided on the connecting frame (5) for the T-shaped guide rod (16) to pass through. A second spring (17) is sleeved on the T-shaped guide rod (16). The two ends of the second spring (17) abut against the clamping plate (15) and the connecting frame (5) respectively.

5. The welding fixture for a plate-type heat sink according to claim 1, characterized in that: Both of the connecting frames (5) are rotatably connected to a screw (18) in the middle. The screw (18) is threadedly connected to a movable plate (10) located at the outermost edge. A third guide rod (19) is fixedly connected inside the connecting frame (5) and on both sides of the screw (18). The third guide rod (19) is slidably inserted into the movable plate (10).

6. The welding fixture for a plate-type heat sink according to claim 1, characterized in that: Each of the two sliders (3) is fixedly connected to a support plate (8) on one side that is close to each other. Several balls (9) are rotatably connected to the top of the support plate (8). The balls (9) are equidistant and staggered to support the heat dissipation tube to be welded.

7. The welding fixture for a plate-type heat sink according to claim 1, characterized in that: The tops of several movable plates (10) inside the same connecting frame (5) are fixedly connected with a connecting rope (20) for linkage control of the position of the movable plates (10).

8. A method of using the welding fixture according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Width adjustment: Rotate the two-way screw (4) to drive the two connecting frames (5) to move closer or further apart along the slide (2) to adjust to the overall width of the finned heat sink. S2, Longitudinal pre-tightening: Rotate the screw (18), guide it through the third guide rod (19), drive the moving plate (10) and clamp (11) to move in the vertical direction, so that the first clamp (12) initially fits against the surface of the radiator; S3, Elastic clamping: Under the elastic force of the first spring (14), the first clamping plate (12) adapts to the extension and retraction through the first guide rod (13) to flexibly clamp the heat sinks of different thicknesses. At the same time, the second clamping plate (15) presses the upper and lower ends of the heat sink under the action of the second spring (17). S4. Welding operation: After the welding parts are fixed, use the ball bearings (9) on the support plate (8) to support the welding gun or workpiece, and perform full welding or spot welding. After welding is completed, loosen each clamp and take out the finished product.

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