A welding device for assembling an inductor on a power module

Abstract

The present application relates to electronic manufacturing equipment technical field, especially to a kind of welding device of inductance on power module assembly. Including rack, rack is provided with positioning stage and vertically arranged Z-axis lifting drive module, Z-axis lifting drive module is provided with heating welding mechanism, heating welding mechanism periphery coaxially is provided with floating heat insulation mechanism, rack is provided with inductance feeding assembly, floating heat insulation mechanism includes outer layer heat insulation component and inner layer heat insulation component, outer layer heat insulation component includes heat insulation shell, heat insulation shell is suspended by spring rod between heating welding mechanism and is installed. The present application is suspended by floating heat insulation mechanism in heat insulation shell, form closed heating cavity with PCB board surface when pressing down, cooperate with cold cutting micropore and build annular heat insulation air curtain by spraying cold air, can be heated while blocking high-temperature airflow and heat radiation when ensuring that inductance large electrode is heated fully and evenly, effectively avoid surrounding small components to be damaged by heat, synchronous with tin smoke collection channel, optimize work environment.

Description

Technical Field

[0001] This invention relates to the field of electronic manufacturing equipment technology, and in particular to a welding device for mounting inductors on a power module. Background Technology

[0002] As the integration density of components within power modules continues to increase, the electrode welding process of power inductors, as core power components, directly determines the reliability of the finished module. Currently, the industry commonly uses local hot air heating to complete the inductor electrode welding process, and mass production automation has become the mainstream development direction. High-density wiring and compact component arrangement are typical design trends for current power modules, which places higher demands on the thermal control precision of the welding process.

[0003] In applications where components are densely packed at varying heights, the inductor electrodes are relatively large. To achieve uniform melting and wetting of the entire electrode, sufficient hot air input is required. However, high-temperature airflow and heat radiation can easily spread to adjacent small components. Traditional thermal protection methods are insufficient in terms of heat insulation and sealing capabilities, and cannot isolate excess heat while ensuring that the large electrode is fully heated. This can easily lead to heat aging and damage to surrounding components. It is difficult to achieve both uniform heating and protection of surrounding components. Summary of the Invention

[0004] To overcome the drawback of not being able to simultaneously achieve uniform heating of inductor electrodes on high-density boards and thermal protection of surrounding components, this invention provides a welding device for mounting inductors on a power module.

[0005] The technical solution is as follows: A welding device for assembling inductors on a power module includes a frame, a positioning platform and a vertically arranged Z-axis lifting drive module on the frame, a heating welding mechanism on the Z-axis lifting drive module, a floating heat insulation mechanism coaxially arranged around the heating welding mechanism, an inductor feeding assembly on the frame, and an floating heat insulation mechanism including an outer heat insulation component and an inner heat insulation component. The outer heat insulation component includes a heat insulation shell, and the heat insulation shell is suspended from the heating welding mechanism by circumferentially evenly distributed spring rods. In the initial state, the lower end surface of the heat insulation shell is lower than the heating welding mechanism. The air outlet end face of the receiving mechanism; an air cavity is provided inside the heat insulation shell, which is connected to the external cold air supply device. The lower part of the inner wall of the heat insulation shell is provided with uniformly distributed air outlet micro-holes. The air cavity of the heat insulation shell is connected to the outside through the air outlet micro-holes. During welding, the Z-axis lifting drive module drives the heating welding mechanism and the floating heat insulation mechanism to move synchronously to the PCB board surface. The heat insulation shell first contacts the PCB board and forms a closed heating cavity. The heating welding mechanism moves to the welding height to heat and weld the inductor electrode. At the same time, the heat insulation shell sprays cold air through the uniformly distributed air outlet micro-holes to form an outer heat insulation air curtain.

[0006] As an improvement to the above solution, the heat insulation shell has a semi-circular annular protective structure. The heat insulation shell adopts a three-layer composite heat insulation structure, with an inner layer of aluminum ceramic that is resistant to high temperature oxidation, a middle layer of air cavity, and an outer layer of metal shell covered with fiberglass heat insulation cotton.

[0007] As an improvement to the above solution, a sealing edge is provided at the contact point between the lower end of the heat insulation shell and the PCB board. The sealing edge is made of high-temperature resistant silicone material, and the maximum floating compression of the heat insulation shell is greater than the rated compression of the sealing edge.

[0008] As an improvement to the above solution, the heating welding mechanism includes a welding component and an adaptation adjustment component. The welding component is located at the output end of the Z-axis lifting drive module and is used to weld the electrodes of the inductor. The welding component includes a housing, which is fixedly connected to the output end of the Z-axis lifting drive module. The housing is slidably connected to the heat insulation shell. The evenly distributed spring rods are all fixedly connected to the housing. A welding drive module is disposed inside the housing, and a lifting drive rod is rotatably connected inside the housing. The lifting drive rod is drively connected to the output end of the welding drive module. A fixed slide is slidably connected inside the housing, and symmetrically distributed heating welding guns are disposed inside the fixed slide. The spacing and angle of the heating welding guns are adjusted by the adaptation adjustment component. The symmetrically distributed heating welding guns share the same external hot air supply device and are supplied with air and controlled at the same time. The two electrode pads of the corresponding power inductor are heated synchronously.

[0009] As an improvement to the above solution, the inner heat insulation component is disposed at the bottom of the outer shell. The inner heat insulation component includes an air ring, which is fixed to the outer shell and is connected to an external cold air supply device. The air outlet of the air ring is gradually inclined from top to bottom towards the axis, and the air outlet of the air ring is provided with evenly distributed inclined baffles.

[0010] As an improvement to the above solution, the top of the heat insulation shell is connected to a tin fume collection channel, which is connected to an external ventilation device. The external ventilation device is linked and matched with an external hot air supply device and an external cold air supply device. The ventilation volume is set proportionally to the air supply volume, and the downward airflow of the air curtain is used to assist in collecting the tin fume.

[0011] As an improvement to the above solution, the adaptive adjustment component is symmetrically arranged within the fixed slide. The adaptive adjustment component cooperates with the inductive feeding component to adjust the spacing and angle between the symmetrically distributed heating welding guns. The adaptive adjustment component includes a first sliding shell, which is slidably connected within the fixed slide. An elastic element is provided between the first sliding shell and the fixed slide. A second sliding shell is slidably connected within the first sliding shell. An elastic element is provided between the second sliding shell and the first sliding shell. The second sliding shell is rotatably connected to the top of the heating welding gun. An adjusting ring is fixedly connected to the heating welding gun near the nozzle. An adjusting rod is rotatably connected to the adjusting ring. The adjusting rod is slidably connected to the first sliding shell. A limiting groove is provided on the fixed slide, and the limiting groove and the adjusting rod are in a limiting sliding cooperation.

[0012] As an improvement to the above solution, the inductor feeding assembly includes a displacement driving module, which is mounted on the frame. The output end of the displacement driving module is fixedly connected to a lifting seat, and a buffer rod is slidably connected to the lifting seat. A pressure sensor is installed inside the lifting seat, and an elastic element is installed between the pressure sensor and the buffer rod. A power module is installed inside the buffer rod, and the output end of the power module is fixedly connected to symmetrically distributed inductor grippers. The symmetrically distributed inductor grippers are slidably engaged with the buffer rod, and the inductor grippers are limited and slidably engaged with the adjacent first sliding shell.

[0013] As an improvement to the above solution, the contact surface between the inductive gripper and the first sliding shell is provided with an inclined guide surface and a vertical limiting surface from bottom to top. The inclined guide surface is matched with the inductor size of the first sliding shell, and the vertical limiting surface locks the position of the first sliding shell, determining the distance and angle between the heating welding guns on both sides. The inclined guide surface of the inductive gripper avoids the heating welding of the heating welding guns on both sides.

[0014] As an improvement to the above solution, the clamping end of the inductor claw is provided with a V-shaped concave clamping groove. The clamping groove of the inductor claw is adapted to the outer contour of the cylindrical inductor, which can disperse the clamping contact stress and avoid deformation of the cylindrical inductor due to concentrated force at a single point. The clamping end of the inductor claw is provided with a buffer pad, which has high temperature resistance.

[0015] The present invention has the following advantages: The present invention uses a floating heat insulation shell suspended in the floating heat insulation mechanism to form a closed heating cavity with the PCB board surface when pressed down. Combined with the cold cutting micro-holes spraying cold air to form a ring heat insulation air curtain, it can ensure that the large electrodes of the inductor are fully and evenly heated while blocking high temperature airflow and heat radiation, effectively avoiding heat damage to surrounding small components. At the same time, it is combined with a solder fume collection channel to optimize the working environment.

[0016] By using the adaptive adjustment component of the heating welding mechanism in conjunction with the inductor feeding component, the distance and angle of the heating welding guns on both sides can be adjusted synchronously to adapt to different specifications of inductors. The inductor gripper and the first sliding shell are positioned by linkage of the inclined guide surface and the vertical limiting surface. When clamping the inductor, the position of the welding gun is simultaneously calibrated without the need for separate debugging, ensuring that the two electrodes are heated synchronously, improving the consistency of weld point formation, and increasing the efficiency of changeover processing.

[0017] The inductive feeding assembly is equipped with a pressure-sensing buffer rod, along with a V-shaped concave clamping groove and a buffer pad. The V-shaped groove makes multi-point contact with the cylindrical inductor to disperse the clamping stress, and the buffer pad provides flexible clamping to prevent pressure deformation damage to the inductor. The pressure sensor collects the inductor contact pressure in real time to achieve overload protection. It can also identify material shortages and abnormal stacking through pressure values, thereby improving the reliability of feeding detection. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention.

[0020] Figure 3 This is a three-dimensional cross-sectional view of the outer thermal insulation component of the present invention.

[0021] Figure 4 This is a three-dimensional cross-sectional view of the gas ring structure of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the welding assembly of the present invention.

[0023] Figure 6 This is a three-dimensional cross-sectional view of the welding assembly of the present invention.

[0024] Figure 7 This is a three-dimensional cross-sectional view of the adaptive adjustment component of the present invention.

[0025] Figure 8 This is a three-dimensional cross-sectional view of the inductor feeding assembly of the present invention.

[0026] Labels in the diagram: 1-Frame, 2-Positioning platform, 3-Z-axis lifting drive module, 4-Heating and welding mechanism, 41-Welding assembly, 411-Outer shell, 412-Welding drive module, 413-Lifting drive rod, 414-Fixed slide, 415-Heating welding torch, 42-Adaptive adjustment assembly, 421-First sliding shell, 422-Second sliding shell, 423-Adjusting ring, 424-Adjusting rod, 5-Floating heat insulation mechanism, 5 1-Outer heat insulation component, 511-Heat insulation shell, 512-Spring rod, 513-Air outlet micropore, 514-Sealing edge, 52-Inner heat insulation component, 521-Air ring, 522-Inclined baffle, 6-Inductive feeding component, 601-Displacement drive module, 602-Lifting seat, 603-Buffer rod, 604-Pressure sensor, 605-Power module, 606-Inductive gripper, 607-Buffer pad, 7-Tin fume collection channel. Detailed Implementation

[0027] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0028] Example 1

[0029] A welding device for mounting inductors on a power module, such as Figure 1-8As shown, the device includes a frame 1, on which a positioning platform 2 and a vertically arranged Z-axis lifting drive module 3 are mounted. A heating and welding mechanism 4 is mounted on the Z-axis lifting drive module 3. A floating heat insulation mechanism 5 is coaxially arranged around the heating and welding mechanism 4. An inductive feeding assembly 6 is mounted on the frame 1. The floating heat insulation mechanism 5 includes an outer heat insulation component 51 and an inner heat insulation component 52. The outer heat insulation component 51 includes a heat insulation shell 511. An air chamber is provided inside the heat insulation shell 511, which is connected to an external cold air supply device. Uniformly distributed air outlet micro-holes 513 are provided on the lower part of the inner wall of the heat insulation shell 511. The air chamber of the heat insulation shell 511 is connected to the outside through the air outlet micro-holes 513, thus providing heat insulation. The shell 511 has a semi-circular annular protective structure. The heat insulation shell 511 adopts a three-layer composite heat insulation structure. The inner layer is a high-temperature resistant anodized aluminum ceramic layer, the middle layer is an air cavity, and the outer layer is a metal shell covered with fiberglass heat insulation cotton. The high-temperature resistant aluminum ceramic inner layer, the air cavity of the middle layer, and the outer layer of fiberglass heat insulation cotton work together to block high-temperature radiation and convective heat flow, thereby improving the overall heat insulation, high-temperature resistance, and cold air storage effect of the heat insulation shell 511 and reducing heat diffusion outward. The heat insulation shell 511 is suspended from the heating and welding mechanism 4 by circumferentially evenly distributed spring rods 512. When pressed down, the springs can float to buffer the impact of hard contact. In the initial state, the lower end face of the heat insulation shell 511 is lower than that of the heating and welding mechanism 4. At the air outlet end face; during welding, the Z-axis lifting drive module 3 drives the heating welding mechanism 4 and the floating heat insulation mechanism 5 to move synchronously towards the PCB board surface. The heat insulation shell 511 first contacts the PCB board and forms a closed heating chamber. The heating welding mechanism 4 moves to the welding height to heat and weld the inductor electrodes. At the same time, the heat insulation shell 511 sprays cold air through the evenly distributed air outlet micro-holes 513 to form an outer heat insulation air curtain. The heat insulation air curtain formed synchronously by the closed heating chamber can both lock in the hot air to ensure that the inductor electrodes are heated evenly and block high temperature to protect the surrounding dense components. A sealing pressure edge 514 is provided at the contact part between the lower end of the heat insulation shell 511 and the PCB board. The sealing pressure edge 514 adopts Made of high-temperature resistant silicone, the maximum floating compression of the heat insulation shell 511 is greater than the rated compression of the sealing edge 514. This is used to ensure that the sealing edge 514 fits against the PCB board surface to seal gaps and prevent hot air leakage. The larger floating compression of the heat insulation shell 511 ensures that the sealing edge 514 is fully compressed and sealed. At the same time, a floating margin is reserved to prevent the edge from being over-compressed and failing, or damaging the PCB and components. The top of the heat insulation shell 511 is connected to a tin fume collection channel 7, which is connected to an external ventilation device. The external ventilation device is linked and matched with an external hot air supply device and an external cold air supply device. The ventilation volume and the air supply volume are set proportionally, and the downward airflow of the air curtain is used to assist in collecting the tin fume.

[0030] like Figures 5-7As shown, the heating welding mechanism 4 includes a welding assembly 41 and an adaptation adjustment assembly 42. The welding assembly 41 is located at the output end of the Z-axis lifting drive module 3. The welding assembly 41 is used to weld the electrodes of the inductor. The welding assembly 41 includes a housing 411 fixed to the output end of the Z-axis lifting drive module 3. The housing 411 is slidably connected to the heat insulation shell 511. The evenly distributed spring rods 512 are all fixed to the housing 411. The welding drive module 412 is disposed inside the housing 411. The welding drive module is rotatably connected inside the housing 411. The output end of 412 is connected to the lifting drive rod 413. A fixed slide block 414 is slidably connected inside the housing 411. The fixed slide block 414 is equipped with symmetrically distributed heating welding guns 415. The symmetrically distributed heating welding guns 415 share the same external hot air supply device and are supplied with air and controlled at the same time. The two electrode pads of the corresponding power inductor are heated synchronously and evenly to ensure that the melting and wetting degree of the two pads is consistent and to improve the uniformity of the weld. The spacing and angle of the heating welding guns 415 can be adjusted by the adaptive adjustment component 42 to adapt to the welding needs of various products.

[0031] like Figure 4 As shown, the inner heat insulation component 52 is located at the bottom of the outer shell 411. The inner heat insulation component 52 includes an air ring 521 fixed to the outer shell 411. The air ring 521 is connected to the external cold air supply device. The air outlet of the air ring 521 is gradually inclined from top to bottom towards the axis, spraying out the cooling airflow gathered inside the box. It blocks the diffusion of high-temperature hot air from the inside of the heating area and forms a double-layer thermal protection with the cold air curtain of the outer heat insulation shell 511. At the same time, it gathers the hot air to prevent heat from damaging the surrounding components. The air outlet of the air ring 521 is provided with evenly distributed inclined baffles 522 to change the flow direction of the cold air sprayed out by the air ring 521, so that the cooling airflow gathers inward to wrap around the heating area, slows down the airflow speed and prolongs the heat insulation effect time, while preventing high-temperature hot air from flowing back into the air ring.

[0032] like Figure 6 and Figure 7As shown, the adaptation adjustment component 42 is symmetrically arranged within the fixed slide 414. The adaptation adjustment component 42, in conjunction with the inductive feeding component 6, adjusts the spacing and angle between the symmetrically distributed heating welding torches 415. The adaptation adjustment component 42 includes a first sliding shell 421 slidably connected within the fixed slide 414. An elastic element, a spring, is provided between the first sliding shell 421 and the fixed slide 414. A second sliding shell 422 is slidably connected within the first sliding shell 421. An elastic element, also a spring, is provided between the second sliding shell 422 and the first sliding shell 421. The second sliding shell 422 is rotatably connected to the top of the heating welding torch 415. An adjusting ring 423 is fixedly connected to the welding torch 415 near the nozzle. The adjusting ring 423 is rotatably connected to an adjusting rod 424. The adjusting rod 424 is slidably connected to the first sliding shell 421. A limiting groove is provided on the fixed slide block 414. The limiting groove and the adjusting rod 424 are in a limiting sliding fit. The first sliding shell 421 drives the adjacent heating welding torches 415 to move to both sides, adaptively adjusting the distance between the heating welding torches 415. Under the action of the second sliding shell 422, the adjusting ring 423 and the adjusting rod 424, the heating welding torches 415 are tilted and deflected, thereby adjusting the angle of the nozzle of the heating welding torch 415 and avoiding insufficient internal heating due to the large electrode being blown vertically.

[0033] like Figure 2 , Figure 6 and Figure 8As shown, the inductor feeding assembly 6 includes a displacement drive module 601 mounted on the frame 1. A lifting seat 602 is fixedly connected to the output end of the displacement drive module 601. A buffer rod 603 is slidably connected to the lifting seat 602. A pressure sensor 604 is installed inside the lifting seat 602. An elastic element, a spring, is installed between the pressure sensor 604 and the buffer rod 603. The pressure sensor 604 collects the pressure value of the buffer rod 603 in real time to detect the contact pressure during inductor clamping and pressing, enabling pressure overload warning. The pressure value also identifies material shortages and abnormal stacking, improving the reliability of feeding detection. A power module 605 is installed inside the buffer rod 603. Symmetrically distributed inductor grippers 606 are fixedly connected to the output end of the power module 605. The symmetrically distributed inductor grippers 606 and the buffer rod 603 are slidably engaged. The inductor grippers 606 are limited and slidably engaged with the adjacent first sliding shell 421. The contact between the inductor grippers 606 and the first sliding shell 421... The contact surface is provided with an inclined guide surface and a vertical limiting surface from bottom to top. The inclined guide surface matches the size of the inductor to the first sliding shell 421. The vertical limiting surface locks the position of the first sliding shell 421, determining the spacing and angle of the welding torches 415 on both sides. The inclined guide surface of the inductor gripper 606 avoids the heating and welding of the welding torches 415 on both sides. The inclined guide surface of the gripper automatically pushes and adjusts the first sliding shell 421 according to the size of the inductor to change the spacing and angle of the welding torches. The vertical limiting surface then... Locking and positioning; the clamping end of the inductor jaw 606 is provided with a V-shaped concave clamping groove. The clamping groove of the inductor jaw 606 is adapted to the outer contour of the cylindrical inductor, which can disperse the clamping contact stress and prevent the cylindrical inductor from deforming due to concentrated force at a single point. The clamping end of the inductor jaw 606 is provided with a buffer pad 607. The buffer pad 607 has high temperature resistance. The V-shaped clamping groove fits the cylindrical inductor to disperse the clamping stress. Combined with the high temperature resistant buffer pad, flexible clamping is achieved to prevent the inductor from being deformed by pressure and scratched on the surface.

[0034] When using this device for inductor soldering, the user powers it on. The external hot air supply, external cold air supply, and external exhaust systems enter standby mode and reach the preset pressure and temperature parameters. The Z-axis lifting drive module 3 drives the heating and soldering mechanism 4 and the floating heat insulation mechanism 5 to rise to the initial height. The displacement drive module 601 of the inductor loading assembly 6 moves the lifting seat 602 and the inductor gripper 606 to the picking point. The PCB board to be soldered is placed on the positioning platform 2, and the position of the inductor electrode to be soldered on the PCB board is aligned horizontally with the axis of the heating soldering gun 415. The preparation work is now complete.

[0035] The displacement drive module 601 drives the lifting platform 602 to move horizontally to the inductor feeding position. The lifting platform 602 then descends, causing the buffer rod 603 to bring the inductor gripper 606 closer to the inductor to be picked up. The buffer pad 607 of the inductor gripper 606 contacts the outer contour of the inductor. If the inductor is cylindrical, the V-shaped concave clamping groove of the inductor gripper 606 disperses the clamping stress through multi-point contact, preventing deformation of the inductor due to single-point force. During clamping, the pressure sensor 604 monitors the elastic pressure transmitted by the buffer rod 603 in real time. If the pressure exceeds a set threshold, the power module 605 immediately stops the clamping action and issues an alarm, achieving overload protection and detection of insufficient or stacked materials.

[0036] The displacement drive module 601 moves the lifting seat 602 holding the inductor to directly above the heating welding mechanism 4 and lowers it so that the inductor electrodes are aligned with the nozzle areas of the heating welding guns 415 on both sides. At this time, the outer wall of the inductor gripper 606 contacts the first sliding shell 421 in the adaptation adjustment component 42. The lower section of the contact surface between the inductor gripper 606 and the first sliding shell 421 is an inclined guide surface, and the upper section is a vertical limiting surface. As the inductor gripper 606 descends, the inclined guide surface pushes the first sliding shells 421 on both sides to slide to the sides and compress the springs. Taking the left first sliding shell 421 as an example, the first sliding shell 421 drives the adjacent adjusting rod 424 and the heating welding gun 415 to move to the left simultaneously. The adjusting rod 424 moves upward under the action of the limiting groove of the fixed slide block 414. The adjusting rod 424 drives the adjusting ring 423 to move upward. The length of the heating welding gun 415 remains unchanged, so that the heating welding gun 415 deflects around the rotating engagement point of the adjusting ring 423 and the adjusting rod 424. The heating welding gun 415 drives the second sliding shell 422 to slide to the left. The spring between the second sliding shell 422 and the first sliding shell 421 is compressed. When the inductor gripper 606 descends to the point where the vertical limiting surface is completely in contact with the first sliding shell 421, the distance and tilt angle of the heating welding guns 415 on both sides are locked and fixed synchronously. At this time, the air outlet axis of the two welding guns is aligned with the two symmetrical motor welding pads of the inductor of this specification, completing the self-adaptive positioning without adjustment.

[0037] After the adaptive positioning of the heating torch 415 is completed, the Z-axis lifting drive module 3 is activated, driving the housing 411 and the floating heat insulation mechanism 5 to move downwards synchronously, approaching the PCB board surface. Since the lower section of the heat insulation housing 511 is lower than the air outlet end face of the heating torch 415 in the initial state, the sealing edge 514 at the lower end of the heat insulation housing 511 contacts the PCB board surface before the torch. As the housing 411 continues to move downwards, the heat insulation housing 511 contacts the PCB board and stops moving. At this time, the circumferentially evenly distributed spring rods 512 begin to be compressed, generating elastic preload, so that the sealing edge 514 fits tightly against the PCB board, forming a completely sealed heating chamber. The maximum floating compression of the heat insulation housing 511 is greater than the rated compression of the sealing edge 514, ensuring effective sealing and no damage to the PCB. The Z-axis lifting drive module 3 continues to descend to the preset welding height. At this time, the air outlet end face of the heating torch 415 is located at the optimal heating distance above the inductive electrode, and the descent stops.

[0038] After the Z-axis lifting drive module 3 stops descending, the welding drive module 412 is started. The lifting drive rod 413 drives the fixed slide 414 and the heating welding gun 415 to be finely adjusted to the precise welding position. The external hot air supply device supplies air to the two symmetrically distributed heating welding guns 415 at the same time, and the air supply volume and temperature are completely consistent. The two electrode pads of the power inductor are heated uniformly by hot air at the same time, so that the electrodes are uniformly melted and wetted.

[0039] While heating, an external cold air supply device supplies cold air to the air ring 521 of the inner heat insulation component 52. The cold air is ejected from the air ring 521 from top to bottom towards the air outlet that is inclined towards the axis. Under the guidance of the inclined baffle 522, it forms an inwardly inclined annular cold air flow, directly preventing the heat radiation generated by the heating torch 415 from diffusing outward from the center. At the same time, the external cold air supply device supplies cold air to the air cavity inside the heat insulation shell 511. After the cold air fills the air cavity, it is ejected horizontally towards the center of the heating cavity through the uniformly distributed air outlet microholes 513 on the lower part of the inner wall of the heat insulation shell 511, forming a uniform, continuous, downwardly pressed annular heat insulation air curtain in the annular area between the inner wall of the heat insulation shell 511 and the inductor. The air curtain effectively blocks hot air and heat radiation from leaking out from the tiny gap between the heat insulation shell 511 and the PCB board to the surrounding small component area. During this process, the high-temperature resistant alumina ceramic layer of the outer heat insulation component 51 and the metal shell covered with fiberglass insulation cotton further enhance the heat insulation effect.

[0040] The solder fumes generated during welding are drawn away by the solder fume collection channel 7 at the top of the heat insulation shell 511. The exhaust volume of the external ventilation device is linked and controlled with the air supply volume of the external cold air supply device and the external hot air supply device according to a preset ratio. The exhaust volume is slightly greater than the air supply volume. With the assistance of the downward airflow of the air curtain, the solder fumes are steadily collected to the channel opening, preventing the solder fumes from escaping and polluting the environment.

[0041] After welding is completed, the external hot air supply device stops supplying air, the heating torch 415 stops heating, and the external cold air supply device continues to supply air for a period of time to quickly cool and shape the welding area while maintaining air curtain protection. The Z-axis lifting drive module 3 reverses its drive, causing the outer shell 411 and all components to rise. The heat insulation shell 511 returns to its natural suspension state under the elastic force of the spring rod 512. The sealing edge 514 is removed from the PCB board. The displacement drive module 601 of the inductor loading component 6 drives the inductor gripper 606 to rise and retract, causing the inductor gripper 606 to disengage from the first sliding shell 421. The first sliding shell 421 resets under the action of the elastic element, causing the heating torch 415 to return to its initial small-pitch state, preparing for the adaptation of the next specification of inductor. The welded PCB board on the positioning platform 2 is removed, thus completing one inductor welding cycle.

[0042] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for mounting inductors on a power module, characterized in that, The system includes a frame (1), on which a positioning platform (2) and a vertically arranged Z-axis lifting drive module (3) are provided. A heating and welding mechanism (4) is provided on the Z-axis lifting drive module (3). A floating heat insulation mechanism (5) is coaxially arranged around the heating and welding mechanism (4). An inductive feeding assembly (6) is provided on the frame (1). The floating heat insulation mechanism (5) includes an outer heat insulation assembly (51) and an inner heat insulation assembly (52). The outer heat insulation assembly (51) includes a heat insulation shell (511). The heat insulation shell (511) and the heating and welding mechanism (4) are suspended by circumferentially evenly distributed spring rods (512). In the initial state, the lower end face of the heat insulation shell (511) is lower than that of the heating and welding mechanism (4). The air outlet end face of the heat insulation shell (511); the heat insulation shell (511) is provided with an air cavity, which is connected to the external cold air supply device. The lower part of the inner wall of the heat insulation shell (511) is provided with uniformly distributed air outlet micro holes (513). The air cavity of the heat insulation shell (511) is connected to the outside through the air outlet micro holes (513). During welding, the Z-axis lifting drive module (3) drives the heating welding mechanism (4) and the floating heat insulation mechanism (5) to move synchronously to the PCB board surface. The heat insulation shell (511) first contacts the PCB board and forms a closed heating cavity. The heating welding mechanism (4) moves to the welding height to heat and weld the inductor electrode. At the same time, the heat insulation shell (511) sprays out cold air through the uniformly distributed air outlet micro holes (513) to form an outer heat insulation air curtain.

2. The welding device for mounting inductors on a power module as described in claim 1, characterized in that, The heat insulation shell (511) has a semi-circular annular protective structure. The heat insulation shell (511) adopts a three-layer composite heat insulation structure. The inner layer is an aluminum ceramic layer that is resistant to high temperature oxidation, the middle layer is an air cavity, and the outer layer is a metal shell covered with fiberglass heat insulation cotton.

3. The welding device for mounting inductors on a power module as described in claim 2, characterized in that, The lower end of the heat insulation shell (511) is provided with a sealing edge (514) at the contact part with the PCB board. The sealing edge (514) is made of high temperature resistant silicone material. The maximum floating compression of the heat insulation shell (511) is greater than the rated compression of the sealing edge (514).

4. The welding device for mounting inductors on a power module as described in claim 3, characterized in that, The heating and welding mechanism (4) includes a welding assembly (41) and an adaptation and adjustment assembly (42). The welding assembly (41) is located at the output end of the Z-axis lifting drive module (3). The welding assembly (41) is used to weld the electrodes of the inductor. The welding assembly (41) includes a housing (411), which is fixedly connected to the output end of the Z-axis lifting drive module (3). The housing (411) is slidably connected to the heat insulation shell (511). The evenly distributed spring rods (512) are all fixedly connected to the housing (411). The welding drive module is provided inside the housing (411). The assembly (412) has a lifting drive rod (413) rotatably connected inside the outer shell (411). The lifting drive rod (413) is connected to the output end of the welding drive module (412). A fixed slide (414) is slidably connected inside the outer shell (411). A symmetrically distributed heating welding gun (415) is provided inside the fixed slide (414). The spacing and angle of the heating welding gun (415) are adjusted by the adaptive adjustment component (42). The symmetrically distributed heating welding guns (415) share the same external hot air supply device and are supplied with air and controlled at the same time. The two electrode pads of the corresponding power inductor are heated synchronously.

5. The welding device for mounting inductors on a power module as described in claim 4, characterized in that, The inner heat insulation component (52) is disposed at the bottom of the outer shell (411). The inner heat insulation component (52) includes an air ring (521). The air ring (521) is fixed to the outer shell (411). The air ring (521) is connected to the external cold air supply device. The air outlet of the air ring (521) is gradually inclined towards the axis from top to bottom. The air outlet of the air ring (521) is provided with evenly distributed inclined baffles (522).

6. The welding device for mounting inductors on a power module as described in claim 5, characterized in that, The top of the heat insulation shell (511) is connected to a tin smoke collection channel (7), which is connected to an external ventilation device. The external ventilation device is linked and matched with an external hot air supply device and an external cold air supply device. The ventilation volume is set proportionally to the air supply volume, and the air curtain is used to press down the airflow to help collect the tin smoke.

7. The welding device for mounting inductors on a power module as described in claim 6, characterized in that, The adaptive adjustment component (42) is symmetrically arranged within the fixed slide (414). The adaptive adjustment component (42) cooperates with the inductor feeding component (6) to adjust the spacing and angle between the symmetrically distributed heating welding guns (415). The adaptive adjustment component (42) includes a first sliding shell (421), which is slidably connected within the fixed slide (414). An elastic element is provided between the first sliding shell (421) and the fixed slide (414). A second sliding shell is slidably connected within the first sliding shell (421). (422) An elastic element is provided between the second sliding shell (422) and the first sliding shell (421). The second sliding shell (422) is rotatably connected to the top of the heating welding gun (415). An adjusting ring (423) is fixedly connected to the heating welding gun (415) near the nozzle. An adjusting rod (424) is rotatably connected to the adjusting ring (423). The adjusting rod (424) is slidably connected to the first sliding shell (421). A limiting groove is provided on the fixed slide block (414). The limiting groove and the adjusting rod (424) are limited and slidably engaged.

8. The welding device for mounting inductors on a power module as described in claim 7, characterized in that, The inductive feeding assembly (6) includes a displacement driving module (601), which is mounted on the frame (1). The output end of the displacement driving module (601) is fixedly connected to a lifting seat (602). The lifting seat (602) is slidably connected to a buffer rod (603). A pressure sensor (604) is provided inside the lifting seat (602). An elastic element is provided between the pressure sensor (604) and the buffer rod (603). A power module (605) is provided inside the buffer rod (603). The output end of the power module (605) is fixedly connected to symmetrically distributed inductive grippers (606). The symmetrically distributed inductive grippers (606) are slidably engaged with the buffer rod (603). The inductive grippers (606) are limited and slidably engaged with the adjacent first sliding shell (421).

9. The welding device for mounting inductors on a power module as described in claim 8, characterized in that, The contact surfaces of the inductor gripper (606) and the first sliding shell (421) are provided with an inclined guide surface and a vertical limiting surface from bottom to top. The inclined guide surface matches the inductor size of the first sliding shell (421), and the vertical limiting surface locks the position of the first sliding shell (421) to determine the distance and angle between the heating welding guns (415) on both sides. The inclined guide surface of the inductor gripper (606) avoids the heating welding of the heating welding guns (415) on both sides.

10. The welding device for mounting inductors on a power module as described in claim 9, characterized in that, The clamping end of the inductor jaw (606) is provided with a V-shaped concave clamping groove. The clamping groove of the inductor jaw (606) is adapted to the outer contour of the cylindrical inductor, which can disperse the clamping contact stress and prevent the cylindrical inductor from deforming due to concentrated force at a single point. The clamping end of the inductor jaw (606) is provided with a buffer pad (607), which has high temperature resistance.

Images