Silver-based metal composite welding strip continuous composite equipment and composite method

Abstract

The application discloses a silver-based metal composite welding strip continuous composite equipment and a composite method, and belongs to the technical field of welding strip production. The silver-based metal composite welding strip continuous composite equipment comprises a first unwinding device, a second unwinding device, a solder spraying device, a composite welding device, a cooling device and a finished product winding device. The solder spraying device comprises first spraying devices and second spraying devices which are arranged at intervals. The first spraying devices and the second spraying devices are respectively used for spraying fluxes to the surfaces of the first strip (silver tin oxide / silver or the like) and the second strip (silver-based solder strip, copper-based or the like). The application adopts an asymmetric double-path flux spraying design before strip composite welding, independently sprays the upper surfaces of the first strip and the second strip, respectively, and continuously forms a welding wetting and reducing atmosphere or a protective film through the mode of processing one side of the strip while keeping the other side clean, so that the welding quality is improved from the source. Meanwhile, continuous composite production is realized, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of metal composite material preparation technology, and in particular to a continuous composite equipment and method for silver-based metal composite welding strips. Background Technology

[0002] Electrical contact materials are widely used in various electrical switches, relays, and other electrical equipment, undertaking the crucial functions of conducting and breaking current. During operation, contact materials are frequently subjected to arc erosion, high-temperature impact, and mechanical wear; therefore, they must possess excellent conductivity, weldability, and abrasion resistance. Silver-based electrical contact materials have gained wider research and application in these fields due to their excellent conductivity, abrasion resistance, weldability, and low contact resistance. To further improve the conductivity and reduce contact resistance, a composite material is typically used, combining silver-tin oxide strip with silver strip. This combines the conductivity of silver with the weldability and ablation resistance of silver-tin oxide, forming a double-layer composite material that balances mechanical strength, heat resistance, electrical properties, and weldability.

[0003] Existing methods for preparing composite strips face several technical challenges, particularly in achieving efficient, continuous, and automated production. Taking silver-tin oxide as an example, current processes for combining silver-tin oxide / silver composite strips with solder strips are hampered by the easy formation of oxide layers on both surfaces. This not only affects soldering quality but also necessitates pickling or strong reducing cleaning to remove the oxide layer. This process presents corrosion risks and environmental pollution, and requires intermittent multi-station operations, hindering true continuous production and limiting efficiency, thus failing to meet the demands of high-speed, continuous, and automated production lines.

[0004] Furthermore, even after pickling, it is difficult to completely remove all the oxide layer on the metal surface, failing to completely solve the problem of oxidation regeneration during welding. This is especially true for silver-tin oxide materials, and the pickling process may cause slight corrosion or deterioration of the metal surface, further affecting the welding quality. Therefore, traditional processes often struggle to guarantee stable composite welding quality and require additional cleaning steps, further increasing production complexity. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a continuous composite equipment for silver-based metal composite welding strips.

[0006] The second objective of this invention is to provide a composite method for a continuous composite equipment for silver-based metal composite welding strips as described above.

[0007] One of the objectives of this invention is achieved through the following solution:

[0008] A continuous composite equipment for silver-based metal composite welding strips includes a strip unwinding device, a solder spraying device, a composite welding device, a cooling device, and a finished product winding device arranged sequentially along the composite process. The strip unwinding device includes a first unwinding device and a second unwinding device for winding and unwinding a first strip and a second strip to be composite welded, respectively, spaced vertically. The solder spraying device includes a first spraying device and a second spraying device spaced along the conveying paths of the first and second strips. The first and second spraying devices are respectively used to spray flux onto the surfaces of the first and second strips. The composite welding device is used to bond and heat the flux-coated first and second strips to form a composite welding strip. The cooling device is used to cool the composite welding strip. The finished product winding device is used to wind the cooled composite welding strip.

[0009] It also includes a control system, which is electrically connected to the strip unwinding device, solder spraying device, composite welding device, cooling device, and finished product winding device to achieve automated control.

[0010] Furthermore, the first spraying device and the second spraying device each include a mounting base, a solder cylinder disposed on the mounting base for holding flux, a push rod movable within the inner cavity of the solder cylinder, and a screw drive mechanism for driving the push rod to move; the end of the solder cylinder is provided with a spraying tube; the screw drive mechanism drives the push rod to move axially along the inner cavity of the solder cylinder, so as to squeeze the flux out from the spraying tube and spray it evenly onto the upper surfaces of the corresponding first strip and second strip.

[0011] Furthermore, the lead screw drive mechanism includes a spraying drive motor, a lead screw, and a push plate threadedly connected to the lead screw, all mounted on the mounting base; the end of the push rod extends outside the solder cylinder and is fixed to the push plate; the spraying drive motor drives the lead screw to rotate, drives the push plate to move axially along the lead screw, and thereby drives the push rod to reciprocate along the inner cavity of the solder cylinder.

[0012] Furthermore, the spraying drive motor is a servo motor or a stepper motor, which is fixed to the mounting base by a motor mounting bracket; the solder tube is fixed to the mounting base by a solder tube mounting bracket, located directly below the motor mounting bracket, and a guide rod is provided between the motor mounting bracket and the solder tube mounting bracket. The two guide rods are located on both sides of the lead screw and are slidably connected to the push plate.

[0013] Furthermore, the composite welding device includes a heating hood and an induction heating coil disposed on the heating hood. The heating hood has a strip inlet on its side wall. After the first strip and the second strip are attached together, they enter the heating hood through the strip inlet. The induction heating coil is used to heat and composite the first strip and the second strip inside the heating hood. At the same time, a protective inert gas or a mixed protective gas is introduced into the heating hood.

[0014] The spray pipes of the first spraying device and the second spraying device are respectively located above the central axis of the upper surface of the first strip and the second strip, and the distance between the spray pipe of the first spraying device and the strip inlet of the heating hood is less than the distance between the spray pipe of the second spraying device and the strip inlet of the heating hood; the distance between the spray pipe of the first spraying device and the strip inlet is 3-5mm.

[0015] Furthermore, the continuous composite equipment also includes a traction guide device for conveying the strip; the traction guide device includes a welding strip traction wheel set for traction of the first strip / second strip and a finished strip traction wheel set for traction of the composite welding strip;

[0016] The welding strip traction wheel set is located on the front side of the composite welding device, and the finished strip traction wheel set is located on the rear side of the cooling device. The welding strip traction wheel set and the finished strip traction wheel set each include two pressure rollers spaced apart and a traction motor for driving the pressure rollers to rotate. The pressure rollers clamp and press against the upper and lower surfaces of the first strip, the second strip, or the composite welding strip, respectively, to pull the corresponding first strip, the second strip, or the composite welding strip forward to the next process.

[0017] Furthermore, the traction guiding device also includes a sensing wheel for contact sensing of the first strip and controlling the start and stop of the traction motor of the pressure roller; the sensing wheel is disposed between the first strip unwinding and the first spraying mechanism, and is located below the first strip. When the first strip sags due to excessive stacking and contacts the sensing wheel, the sensing wheel sends a strip contact sensing signal to the control system, and the control system controls the traction motor to stop working.

[0018] Furthermore, the traction guiding device also includes a guide wheel assembly disposed on the side of the welding strip traction wheel assembly and / or the finished strip traction wheel assembly; the guide wheel assembly includes two horizontally rotatable guide wheels spaced apart, the two guide wheels being symmetrically arranged on the left and right sides of the strip travel direction to limit the lateral displacement of the first strip and / or the second strip and / or the composite welding strip.

[0019] Furthermore, the heating hood is equipped with a ventilation pipe for introducing composite protective gas into the strip, and an infrared thermometer for real-time temperature measurement is also provided above the heating hood; the cooling device includes a cooling hood, on which a cooling circulating water pipe is provided and connected to an external circulating cooling water source through the cooling circulating water pipe; the finished product winding device includes a winding drum for rotating and winding the cooled composite welding strip; the composite equipment also includes a waste gas recovery device for absorbing welding waste gas generated during continuous welding.

[0020] The second objective of this invention is achieved by the following technical solution:

[0021] A composite method for a continuous composite equipment for silver-based metal composite welding strips as described above includes the following steps:

[0022] S1: Strip unwinding

[0023] Control the strip unwinding device to release the first strip and the second strip respectively, ensuring stable conveying of the first strip and the second strip;

[0024] S2: Flux Spraying

[0025] The first spraying device and the second spraying device are controlled to uniformly spray flux onto the upper surfaces of the first strip and the second strip, respectively.

[0026] S3: Strip mating and induction heating composite

[0027] After the first and second strips are coated with flux, they are bonded together and enter the composite welding device. The composite welding device heats and performs composite welding on the strips to form a composite weld strip.

[0028] S4: Cooling and winding

[0029] After welding, the composite weld strip enters the cooling device for cooling and temperature reduction; the cooled composite weld strip is stably conveyed by the traction device to the winding device, and finally wound into a roll.

[0030] Furthermore, in S3, argon or other protective atmosphere is introduced into the heating hood of the composite heating device to create positive pressure, causing welding waste gas to be discharged from the feed opening and thus drawn into the waste gas recovery device.

[0031] Furthermore, the spraying flow rate of the first and second spraying devices is 5-10 ml / min; the strip traction speed is 1-5 m / min; and the heating temperature is 600-750℃.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. This invention incorporates a solder spraying device before strip composite welding to spray flux onto the surfaces of the strips to be composited, providing a self-wetting welding metal interface for continuous welding. This effectively removes oxides from the strip surface and, through the activation effect of the flux, refines the metallographic structure of the solder, reducing welding porosity and providing continuous anti-oxidation protection during the welding process. This improves welding quality from the source, avoiding the problems of oxide regeneration, unclean welding interfaces, coarse metallographic structures, and excessive porosity found in traditional processes.

[0034] Meanwhile, an asymmetric dual-path flux spraying design is adopted, with independent spraying treatments applied to the upper surfaces of the first and second strips. By treating one side of the strip while keeping it clean, it participates in welding on one side and provides surface protection on the other, thus performing deoxidation, anti-oxidation, and cleaning functions respectively. This avoids the risks of excessive flux residue, hot melt seepage, and adhesion. A stable protective atmosphere positive pressure chamber ensures a clean welding interface and improves the quality of the weld bond. After lamination, the flux-treated interface participating in welding is sealed inside to prevent flux residue from coming into contact with the outside air and causing a secondary oxidation reaction. At the same time, it avoids flux transfer to equipment, rolls, or other strip surfaces, which could cause contamination.

[0035] Furthermore, during the induction heating process, the flux continuously forms a reducing atmosphere or protective film, effectively preventing the interface from oxidizing again, thus achieving a stronger metallurgical bond during the welding process. Moreover, there is very little residue on the weld sheet after welding, the welding quality is high, and simple additional cleaning is required, which greatly simplifies subsequent processing procedures, improves production efficiency, and reduces production costs.

[0036] 2. This invention optimizes the flux spraying position. The spraying pipes of the first and second spraying devices are respectively located above the central axis of the upper surface of the strip. Furthermore, the distance between the spraying pipe of the first spraying device and the strip inlet of the heating shroud is less than the distance between the spraying pipe of the second spraying device and the strip inlet of the heating shroud. The distance between the spraying pipe of the first spraying device and the strip inlet is 3-5 mm. This reduces the time interval between spraying and heating, ensuring that the surface of the silver strip is fully activated, rapidly removing the oxide layer and providing continuous surface protection for the welding process. This prevents flux failure or oxide reformation due to excessive time. Simultaneously, it ensures sufficient reaction time, preventing excessive evaporation or drying. This not only improves welding efficiency but also ensures more precise flux application, improving the quality of composite production.

[0037] 3. The traction and guiding device of the present invention has a simple structure and provides more stable conveying of the welding strip. Specifically, the traction and guiding device includes two sets of pressure roller traction mechanisms located before and after the welding device and a matching guide wheel set, which respectively press the upper and lower surfaces of the strip to prevent the strip from slipping, deviating or loosening during the conveying process, and ensure that the strip enters the composite welding device at a constant speed and a stable path. At the same time, the guide wheels set on both sides of the strip provide lateral restriction on the running direction of the strip to prevent the strip from snaking or deviating in position, and further improve the accuracy of the fitting position and weld alignment.

[0038] 4. The composite equipment of this invention has a high degree of intelligence, improving the efficiency of welding strip composite. First, the equipment is equipped with an independent automatic flux spraying mechanism, combined with a servo drive and quantitative control system, ensuring stable and controllable flux spraying amount, avoiding waste and improving the consistency of welding interface processing. Second, the induction heating device integrates an infrared thermometer, a multi-channel intelligent temperature control system, and a matching design of induction coils, which can monitor the temperature changes in the welding zone in real time, accurately adjust the heating power and heating area, and adapt to the composite needs of strips of different materials and thicknesses. It also features a synchronous traction guide system and an induction wheel, which senses the status of the strip welding piece in real time and automatically starts and stops traction, effectively preventing strip accumulation or material breakage and improving overall operational stability.

[0039] 5. This invention sets the spray flow rate of the first and second spraying devices to 5-10 ml per minute, and the strip traction speed to 1-5 meters per minute. Through the coordination of the strip traction speed and flux spray flow rate, it ensures that the flux uniformly covers the surfaces of the first and second strips, providing sufficient surface activation and removing the oxide layer, while also providing continuous oxidation protection for the welded cross-section. Simultaneously, the heating temperature of this invention is controlled between 600-750℃, ensuring that the welded bond between silver tin oxide / silver and silver-based solder strips has sufficient strength-to-thickness ratio, good porosity and electrical properties, and stable oxidation resistance.

[0040] Furthermore, by precisely controlling parameters such as spray flow rate, strip traction speed, and composite welding heating temperature, energy waste caused by overheating, uneven temperature, or unstable traction speed is reduced while ensuring welding quality, resulting in a higher energy efficiency ratio.

[0041] 6. This invention enables continuous composite production. In the composite process, the seamless integration of strip unwinding, spraying, welding, cooling, and rewinding makes the production process smoother and more efficient, avoiding operational interruptions and manual intervention. Furthermore, by precisely controlling parameters such as spraying flow rate, strip traction speed, and heating temperature, this process not only optimizes the production process and avoids resource waste caused by overheating or uneven temperature, but also significantly improves energy efficiency. Simultaneously, this invention avoids the use of traditional polluting processes such as pickling, reducing waste liquid and acid mist emissions, making it more environmentally friendly. The continuous composite production process of this invention not only improves production efficiency but also enhances product quality and reduces production costs, resulting in significant economic benefits. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of the silver-based metal composite welding strip continuous composite equipment according to Embodiment 1 of the present invention;

[0043] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure at point D;

[0044] Figure 3 This is a cross-sectional structural schematic diagram of the silver-based metal composite welding strip continuous composite equipment according to Embodiment 1 of the present invention;

[0045] Figure 4 for Figure 3 Enlarged schematic diagram of the local structure at point E;

[0046] Figure 5 This is a partial structural schematic diagram of the silver-based metal composite welding strip continuous composite equipment according to Embodiment 1 of the present invention;

[0047] Figure 6 This is a partial front view of the silver-based metal composite welding strip continuous composite equipment according to Embodiment 1 of the present invention;

[0048] Figure 7 This is a schematic diagram of the solder feeding device structure of the silver-based metal composite welding strip continuous composite equipment in Embodiment 1 of the present invention;

[0049] Figure 8 This is an exploded view of the solder feeding device structure of the silver-based metal composite welding strip continuous composite equipment according to Embodiment 1 of the present invention;

[0050] Figure 9 This is a schematic diagram of the finished product belt traction wheel assembly of the silver-based metal composite welding strip continuous composite equipment according to Embodiment 1 of the present invention;

[0051] Figure 10 The figure shows the composite effect of the composite ribbon prepared by the composite method of the silver-based metal composite ribbon continuous composite equipment in Embodiment 2 of the present invention.

[0052] In the picture:

[0053] 1. Strip unwinding device; 11. First unwinding device; 12. Second unwinding device; 2. Solder spraying device; 21. First spraying device; 22. Second spraying device; 23. Mounting base; 24. Solder cylinder; 241. Spraying pipe; 25. Push rod; 26. Screw drive mechanism; 261. Spraying drive motor; 262. Screw; 263. Push plate; 264. Motor mounting bracket; 265. Solder cylinder mounting bracket; 266. Guide rod; 3 1. Composite welding device; 31. Heating cover; 311. Strip inlet; 32. Induction heating coil; 33. Ventilation pipe; 4. Cooling device; 41. Cooling cover; 42. Cooling circulating water pipe; 5. Finished product winding device; 51. Winding drum; 6. Control system; 7. Traction guide device; 71. Welding strip traction wheel set; 72. Finished product traction wheel set; 73. Guide wheel set; 74. Induction wheel; 8. Strip support; 9. Waste gas recovery device;

[0054] A. First strip; B. Second strip; C. Composite welding strip. Detailed Implementation

[0055] To facilitate understanding of the present invention, the technical solutions and advantages of the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific structures and features of the present invention are illustrated by way of example and should not be construed as limiting the invention in any way. Furthermore, any of the technical features mentioned below (including implicit or disclosed features), as well as any technical features directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form other embodiments that may not be directly or indirectly mentioned in the present invention. The accompanying drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0056] In this invention, unless otherwise specified, the equipment or components used can be purchased from the market or are commonly used by those skilled in the art.

[0057] Example 1

[0058] like Figure 1-9As shown, this embodiment 1 provides a continuous composite equipment for silver-based metal composite welding strips, including a strip unwinding device 1, a solder spraying device 2, a composite welding device 3, a cooling device 4, and a finished product winding device 5 arranged sequentially along the composite process. The strip unwinding device 1 includes a first unwinding device 11 and a second unwinding device 12 for winding and unwinding the first strip A and the second strip B to be composite welded, respectively, and the two are arranged vertically at intervals. In this embodiment 1, the first unwinding device 11 and the second unwinding device 12 are both rolls, which are installed on the frame or unwinding cabinet via unwinding shafts. The unwinding shaft is generally unpowered and can be a conventional adjustable tension magnetic powder brake (0.6kg) that operates synchronously with an existing tension controller. In some alternative embodiments, the unwinding shaft can also be driven by a motor.

[0059] The solder spraying device 2 includes a first spraying device 21 and a second spraying device 22 spaced apart on the conveying paths of the first strip A and the second strip B; the first spraying device 21 and the second spraying device 22 are respectively used to spray flux onto the surfaces of the first strip A and the second strip B.

[0060] In this embodiment 1, the first strip A can be silver tin oxide / silver strip, and the second strip B can be silver-based solder strip, copper-based strip, or other strips; the flux can be any type of flux suitable for the above-mentioned strip composite. For example, the flux can be a micro-active, non-corrosive, or flux type specifically designed for precious metal welding to meet the welding requirements of silver or silver-based materials.

[0061] It should be understood that the structure described in this solution is not limited to a composite of silver-based solder strip, copper-based strip, or silver tin oxide / silver strip. In other embodiments, the first strip A and the second strip B can also be other metals or their alloys. The appropriate flux type can be flexibly selected based on the thermal conductivity, melting point, and surface oxidation characteristics of different metal combinations.

[0062] This invention incorporates a flux spraying device before strip composite welding to spray flux onto the surfaces of the strips to be composited, providing a clean metal interface for subsequent welding. This effectively removes oxides from the strip surface and provides continuous anti-oxidation protection during the welding process through the activation effect of the flux. This improves welding quality from the source and avoids the problems of oxide regeneration and unclean welding interfaces in traditional processes.

[0063] Meanwhile, an asymmetric dual-path flux spraying design is adopted, which independently sprays a quantitative amount of flux onto the upper surfaces of the first and second strips. By treating one side of the strip while keeping it clean, it participates in welding on one side and provides surface protection on the other, thus performing deoxidation, anti-oxidation, and wetting and cleaning functions respectively. This avoids the risks of excessive flux residue, hot melt seepage, and adhesion, ensuring a clean welding interface and improving the bonding quality. After lamination, the flux-treated and welding interfaces are sealed inside, preventing flux residues from coming into contact with the outside air and causing secondary oxidation reactions. At the same time, it avoids flux transfer to equipment, rolls, or other strip surfaces, which could cause contamination.

[0064] Furthermore, during the induction heating process, the flux can continuously form a wetting and reducing gaseous oxide on the silver-based solder sheet. With the introduction of argon or other mixed gases to form a protective film, it effectively prevents the interface from oxidizing again, resulting in a stronger metallurgical bond during the welding process. Moreover, there is very little residue after welding, requiring only simple cleaning, which greatly simplifies subsequent processing procedures, improves production efficiency, and reduces production costs.

[0065] The structure of the solder spraying device 2 is further described as follows: The first spraying device 21 and the second spraying device 22 each include a mounting base 23, a solder cylinder 24 disposed on the mounting base 23 for holding flux, a push rod 25 movable in the inner cavity of the solder cylinder 24, and a lead screw 262 drive mechanism 26 for driving the push rod 25 to move; the end of the solder cylinder 24 is provided with a spraying pipe 241; the lead screw 262 drive mechanism 26 drives the push rod 25 to move axially along the inner cavity of the solder cylinder 24 so as to squeeze the flux out from the spraying pipe 241 and spray it evenly onto the upper surface of the corresponding first strip and second strip.

[0066] In this example, the solder cylinder 24 is a cylinder with an opening at the bottom, and the spraying tube 241 adopts a slender, bent tubular structure. This design allows for flexible adjustment of the spraying tube angle or position according to production needs. For example, the bent design of the spraying tube near the opening of the second spraying device facilitates avoidance of the first strip above, thus adapting to strips of different sizes and improving composite flexibility. The push rod 25 is a piston-type linear push rod with a sealing ring at the end. The end diameter of the push rod matches the inner diameter of the solder cylinder to ensure the flux spraying effect.

[0067] Further detailed, the lead screw 262 drive mechanism 26 includes a spraying drive motor 261 mounted on the mounting base 23, a lead screw 262, and a push plate 263 threadedly connected to the lead screw 262; the end of the push rod 25 extends outside the solder cylinder 24 and is fixed to the push plate 263. The spraying drive motor 261 drives the lead screw 262 to rotate, drives the push plate 263 to move axially along the lead screw 262, and then drives the push rod 25 to reciprocate along the inner cavity of the solder cylinder 24. In this example, the spraying drive motor 261 is a servo motor or a stepper motor, such as a small geared servo motor (0.04kW), fixed to the mounting base 23 by a motor mounting bracket 264; the lead screw 262 can be an M6 ball screw, or other conventional lead screws that can meet the requirements of this invention. The solder tube 24 is fixed on the mounting base 23 by the solder tube mounting bracket 265 and is located directly below the motor mounting bracket 264. A guide rod 266 is provided between the motor mounting bracket 264 and the solder tube mounting bracket 265. The two guide rods 266 are located on both sides of the lead screw 262 and are slidably connected to the push plate 263.

[0068] In this embodiment, a slender, bent tubular spraying tube, in conjunction with a screw drive mechanism, drives a propulsion rod to reciprocate via a spraying drive motor. The amount and speed of flux sprayed are precisely controlled according to the width of the strip. Generally, the nozzle of the spraying tube is as close as possible to the surface of the strip to ensure that the flux is evenly covered on the surface of the strip, avoiding excessive or insufficient spraying and ensuring the quality of the welding interface.

[0069] The composite welding device 3 is used to bond and heat-bond a first strip A and a second strip B, which have been coated with flux, to form a composite weld strip C. Specifically, the composite welding device 3 includes a heating cover 31 and an induction heating coil 32 disposed on the heating cover 31. In this example, the induction heating coil 32 adopts an ultra-high frequency induction heating power supply system with a power of 20~40kW and uses all-solid-state Siemens IGBT frequency conversion module technology, which can output high-frequency high-frequency current. This current forms a strong magnetic field through the correspondingly designed induction coil and acts on the bonded metal weld strip, causing eddy currents to be rapidly induced on the surface of the weld strip, which heats up rapidly under the action of resistance, achieving localized, rapid, and stable heating.

[0070] The heating cover 31 has a strip inlet 311 on its side wall. The first strip A and the second strip B are attached together and then enter the heating cover 31 through the strip inlet 311. The induction heating coil 32 is used to heat and composite the first strip A and the second strip B inside the heating cover 31.

[0071] To further improve the flux spraying effect and composite welding effect, the spraying pipes 241 of the first spraying device 21 and the second spraying device 22 are respectively located above the central axis of the upper surface of the first strip A and the second strip B, and the distance between the spraying pipe 241 of the first spraying device 21 and the strip inlet 311 of the heating shroud 31 is less than the distance between the spraying pipe 241 of the second spraying device 22 and the strip inlet 311 of the heating shroud 31; the distance between the spraying pipe 241 of the first spraying device 21 and the strip inlet 311 is 3-5mm.

[0072] In this embodiment, specifically, the distance between the spray pipe 241 of the first spraying device 21 and the strip inlet 311 refers to the distance from the nozzle edge of the spray pipe 241 to the inlet edge of the strip inlet 311 of the heating shroud 31. This distance refers to the vertical distance between the nozzle outlet of the spray pipe 241 and the opening portion of the heating shroud inlet.

[0073] In this embodiment, the spray pipes of the first spraying device and the second spraying device are respectively located above the central axis of the upper surface of the strip. The distance between the spray pipe of the first spraying device and the strip inlet of the heating hood is less than the distance between the spray pipe of the second spraying device and the strip inlet of the heating hood. The distance between the spray pipe of the first spraying device and the strip inlet is 3-5mm. That is, the flux after spraying immediately participates in the welding composite process after induction heating. This not only reduces the time interval between spraying and welding, but also improves the temperature control effect of the welding area, making the welding process more efficient and stable, thereby greatly improving the welding quality and consistency of the composite welding strip.

[0074] In this embodiment, the first spraying device sprays the surface of the silver strip. The distance between the spraying tube of the first spraying device and the strip inlet is 3-5 mm, which can reduce the time interval between spraying and heating, ensure that the surface of the silver strip is fully activated, quickly remove the oxide layer, and provide continuous surface protection for the welding process, avoiding flux failure or oxide reformation due to excessive time. At the same time, it also ensures sufficient reaction time to avoid excessive evaporation or drying.

[0075] In this embodiment, the heating cover is provided with a ventilation pipe 33 for introducing composite protective gas for the strip, and an infrared thermometer 34 for real-time temperature measurement is also provided above the heating cover 31.

[0076] The heating cover 31 is equipped with a protective gas venting pipe 43, which can continuously introduce non-oxidizing atmospheres such as nitrogen, argon or ammonia decomposition gas into the heating area to suppress metal oxidation reaction during high-temperature welding. The heating cover 31 is also equipped with an infrared thermometer 34 to monitor the surface temperature of the welding strip in real time and feed it back to the main control system for easy temperature adjustment and welding quality control.

[0077] The cooling devices 4 are spaced apart on one side of the composite welding device 3, and the cooling devices 4 are used to cool the composite welding strip C; the finished product winding device 5 is used to wind up the cooled composite welding strip C; specifically, the cooling device 4 includes a cooling cover 41, the cooling cover 41 is provided with a cooling circulating water pipe 42, and is connected to an external circulating cooling water source through the cooling circulating water pipe 42; the finished product winding device 5 includes a winding drum 51, which is used to rotate and wind up the cooled composite welding strip C.

[0078] In this embodiment, the cooling device 4, through a cooling cover equipped with cooling circulating water pipes, utilizes an external circulating cooling water source to provide a continuous and stable cooling fluid. This allows the composite welding strip C to cool down rapidly and uniformly after heating and welding, effectively controlling the heat-affected zone after welding and preventing excessive welding stress or material deformation. When the cooled welding strip is sent to the winding device, the rotation of the winding drum stably and efficiently winds up the cooled composite welding strip C, ensuring that the composite welding strip C has a uniform and compact shape.

[0079] In this embodiment, the winding direction of the composite welding strip C is designed so that the side without flux is wound outward. The advantage of this design is that it can keep the strip clean, prevent adhesion between strips or uneven winding, and ensure winding quality.

[0080] In this embodiment, the winding motor is a 1.5kW motor with a reducer and a 5kg magnetic powder clutch. The frequency (Hz) is adjusted by a frequency converter to precisely control the winding speed. Simultaneously, a tension controller can be installed to monitor and adjust the reel tension in real time, ensuring it precisely matches the pressure applied by the front-end traction. This prevents the finished composite welding strip from becoming loose, stretched, or scratched, ensuring the cooled composite welding strip is flat and stably wound, thus improving the reliability and quality control capabilities of the entire automated operation line.

[0081] The present invention also includes a control system 6, which is electrically connected to the strip unwinding device 1, the solder spraying device 2, the composite welding device 3, the cooling device 4, and the finished product winding device 5.

[0082] This invention achieves fully automated and continuous production from strip unwinding to rewinding by combining the control system 6 with the control of various devices.

[0083] The continuous composite equipment also includes a traction guide device 7 for conveying the strip; the traction guide device 7 includes a welding strip traction wheel set 71 for traction of the first strip A / second strip B and a finished strip traction wheel set 72 for traction of the composite welding strip C.

[0084] The welding strip traction wheel set 71 is located on the front side of the composite welding device 3, and the finished product strip traction wheel set 72 is located on the rear side of the cooling device 4. The welding strip traction wheel set 71 and the finished product strip traction wheel set 72 each include two pressure rollers spaced apart and a traction motor for driving the pressure rollers to rotate. The pressure rollers clamp and press the first strip A, the second strip B, or the composite welding strip onto the upper and lower surfaces respectively. This is to pull the corresponding first strip A, second strip B, or composite welding strip forward to the next process as needed.

[0085] In this embodiment, a set of welding strip traction wheels can be installed at the first unwinding device to traction the first strip, while the second strip B relies on the finished strip traction wheel set 72 for traction. The advantage of this approach is that it reduces the need for separate traction control of the second strip B, thereby optimizing equipment design and simplifying operation. Simultaneously, the finished strip traction wheel set 72 also effectively ensures the stable transport of the composite welding strip C.

[0086] Alternatively, in a possible implementation, a set of welding strip traction wheels is provided to provide traction force for the first strip A and the second strip B respectively, ensuring that the two strips can be stably and smoothly transported to the composite welding device 3.

[0087] These two setup methods can be flexibly selected according to production needs. As long as synchronous unwinding and rewinding can be achieved, it can be implemented. Further details are omitted here.

[0088] In some possible implementations, the traction guiding device 7 further includes a guide wheel group 73 disposed on the side of the welding strip traction wheel group and / or the finished strip traction wheel group; the guide wheel group 73 includes two horizontally rotatable guide wheels spaced apart, the two guide wheels being symmetrically arranged on the left and right sides of the strip travel direction to limit the lateral displacement of the first strip and / or the second strip and / or the composite welding strip.

[0089] In some possible implementations, the traction guide device 7 further includes a sensing wheel 74 for contact sensing of the first strip A and controlling the start and stop of the traction motor of the pressure roller; the sensing wheel 74 is disposed between the unwinding of the first strip A and the first coating mechanism, and is located below the first strip A. When the first strip A sags due to excessive accumulation and contacts the sensing wheel 74, the sensing wheel 74 sends a strip contact sensing signal to the control system 6, and the control system 6 controls the traction motor to stop working. In this example, by sensing the strip status in real time and automatically starting and stopping traction through the sensing wheel 74, strip accumulation or material breakage is effectively prevented, improving the overall operational stability.

[0090] In some possible implementations, a strip support 8 may be provided between the welding strip traction wheel of the first strip A and the solder spraying device 2, and a plurality of support rollers may be provided sequentially at intervals on the strip support 8; the induction wheel 74 may be provided on the strip support 8 and located below the first welding strip between two of the support rollers.

[0091] In this embodiment, the intelligent control of the sensing wheel 74 allows for real-time sensing of the strip's status, preventing issues such as strip accumulation or material breakage. It also avoids overload or damage to the traction motor caused by strip accumulation or shortness, ensuring the continuity and smoothness of production.

[0092] Specifically, in this example, it also includes a frame (not shown in the attached figure), which is used to house the solder dispensing device, the composite welding device, and the cooling device.

[0093] In some optional embodiments, as shown in 3-4, the composite equipment further includes a waste gas recovery device 9, which is located on the strip inlet 311 side and includes a waste gas recovery pipe corresponding to the strip inlet. This pipe is used to absorb welding waste gases generated during continuous welding. Argon or other protective atmospheres are introduced into the heating hood of the composite heating device to create positive pressure, causing the welding waste gases to be discharged from the strip inlet and drawn into the waste gas recovery device. By timely absorbing harmful gases generated during the welding process, the quality of the working environment is improved.

[0094] It should be noted that components whose models or specific structural parameters are not specifically listed in this specification (such as motors, guide wheels, infrared thermometers, induction coil structures, cooling devices, transmission mechanisms, etc.) can be configured and implemented using commonly used mature components or equivalent alternatives in the prior art, provided that the core technical solution of this invention is not affected. Those skilled in the art can select and combine suitable existing components according to specific production needs and equipment selection standards.

[0095] Example 2

[0096] This embodiment 2 provides a composite method for the continuous composite equipment for metal composite welding strips as described in embodiment 1, including the following steps:

[0097] S1: Strip unwinding

[0098] Control the strip unwinding device 1 to release the first strip A and the second strip B respectively, ensuring stable conveying of the first strip A and the second strip B;

[0099] In this step, the first and second strips can be stably conveyed through the automated control system and the first unwinding device, the second unwinding device, and the welding strip traction wheel group. The real-time sensing of the strip by the sensing wheel avoids problems such as strip accumulation.

[0100] S2: Flux Spraying

[0101] The first spraying device 21 and the second spraying device 22 are controlled to uniformly spray flux onto the upper surfaces of the first strip A and the second strip B, respectively.

[0102] To be further specified, the spraying flow rate of the first spraying device 21 and the second spraying device 22 is 5-10 ml / min;

[0103] S3: Strip mating and induction heating composite

[0104] After the first strip A and the second strip B are coated with flux, they are bonded together and then enter the composite welding device 3. The composite welding device 3 heats and performs composite welding on the strips to form a composite welded strip C. Specifically, the heating temperature is 600-750℃.

[0105] S4: Cooling and winding

[0106] After welding, the composite weld strip C enters the cooling device 4 for cooling and temperature reduction; the cooled composite weld strip C is stably conveyed by the traction device to the winding device and finally wound into a coil.

[0107] In a preferred embodiment, in step S3, argon or other protective atmosphere is introduced into the heating hood of the composite heating device to create positive pressure that causes welding waste gas to be discharged from the feed opening and thus drawn into the waste gas recovery device.

[0108] In this embodiment, argon or other protective atmosphere is introduced into the heating hood of the composite heating device to create positive pressure, causing welding waste gas to be discharged from the feed opening and then drawn into the waste gas recovery device. By timely absorbing harmful gases generated during the welding process, the quality of the working environment is improved.

[0109] In this embodiment, the spraying flow rate of the first spraying device 21 and the second spraying device 22 is set to 5-10 ml per minute, and the strip traction speed is set to 1-5 meters per minute. By coordinating the strip traction speed and the flux spraying flow rate, the flux is ensured to uniformly cover the surfaces of the first strip A and the second strip B, providing sufficient surface activation and wetting effects, removing the oxide layer, and simultaneously providing continuous oxidation protection for the welded cross-section. Meanwhile, the heating temperature of this invention is controlled between 600-750℃ to ensure that the welded bond between silver tin oxide and the silver-based solder strip has sufficient strength, good porosity electrical properties, and stable oxidation resistance.

[0110] Furthermore, by precisely controlling parameters such as spray flow rate, strip traction speed, and composite welding heating temperature, energy waste caused by overheating, uneven temperature, or unstable traction speed is reduced while ensuring welding quality, resulting in a higher energy efficiency ratio.

[0111] Thus, as Figure 10 As shown, the composite welding strip prepared by this invention has fewer welding pores, a dense and uniform welding interface, and a refined and continuous metallographic structure. The weld is tightly bonded to the base strip, significantly improving welding strength and ensuring stable and reliable electrical conductivity. The welding interface is sealed to effectively prevent secondary oxidation, resulting in a smooth and clean surface without obvious oxides or weld slag residue. Furthermore, it exhibits superior mechanical properties, wear resistance, and heat resistance.

[0112] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A continuous composite equipment for silver-based metal composite welding strips, characterized in that, The system includes a strip unwinding device, a solder spraying device, a composite welding device, a cooling device, and a finished product winding device, arranged sequentially along the composite process. The strip unwinding device comprises a first unwinding device and a second unwinding device, respectively used for winding and unwinding a first strip and a second strip to be composite welded, spaced vertically apart. The solder spraying device comprises a first spraying device and a second spraying device, spaced apart along the conveying paths of the first and second strips. The first and second spraying devices are used to spray flux onto the surfaces of the first and second strips, respectively. The composite welding device is used to bond and heat the flux-coated first and second strips to form a composite weld strip, and simultaneously introduces a protective gas. The cooling device is used to cool the composite weld strip. The finished product winding device is used to wind up the cooled composite weld strip. It also includes a control system, which is electrically connected to the strip unwinding device, the solder spraying device, the composite welding device, the cooling device, and the finished product winding device; The first spraying device and the second spraying device each include a mounting base, a solder cylinder for holding flux disposed on the mounting base, a push rod movable in the inner cavity of the solder cylinder, and a screw drive mechanism for driving the push rod to move; the end of the solder cylinder is provided with a spraying tube; the screw drive mechanism drives the push rod to move axially along the inner cavity of the solder cylinder so as to squeeze the flux out from the spraying tube and spray it evenly onto the upper surfaces of the corresponding first strip and second strip; The composite welding device includes a heating hood and an induction heating coil disposed under the heating hood. The heating hood has a strip inlet on its side wall. After the first strip and the second strip are attached together, they enter the heating hood through the strip inlet. The induction heating coil is used to heat and composite the first strip and the second strip inside the heating hood, and at the same time, a protective inert gas or a mixed protective gas is introduced into the heating hood. The spray pipes of the first spraying device and the second spraying device are respectively located above the central axis of the upper surface of the first strip and the second strip, and the distance between the spray pipe of the first spraying device and the strip inlet of the heating hood is less than the distance between the spray pipe of the second spraying device and the strip inlet of the heating hood; the distance between the spray pipe of the first spraying device and the strip inlet is 3-5mm.

2. The continuous composite equipment for silver-based metal composite welding strips as described in claim 1, characterized in that, The lead screw drive mechanism includes a spraying drive motor, a lead screw, and a push plate threadedly connected to the lead screw, all mounted on the mounting base. The end of the push rod extends outside the solder cylinder and is fixed to the push plate. The spraying drive motor drives the lead screw to rotate, which in turn drives the push plate to move axially along the lead screw, thereby driving the push rod to reciprocate along the inner cavity of the solder cylinder to precisely dispense flux.

3. The continuous composite equipment for silver-based metal composite welding strips as described in claim 2, characterized in that, The spraying drive motor is a servo motor or a stepper motor, which is fixed to the mounting base by a motor mounting bracket; the solder tube is fixed to the mounting base by a solder tube mounting bracket, located directly below the motor mounting bracket, and a guide rod is provided between the motor mounting bracket and the solder tube mounting bracket. The two guide rods are located on both sides of the lead screw and are slidably connected to the push plate.

4. The continuous composite equipment for silver-based metal composite welding strips as described in claim 3, characterized in that, The continuous composite equipment also includes a traction guide device for conveying the strip; the traction guide device includes a welding strip traction wheel set for traction of the first strip / second strip and a finished strip traction wheel set for traction of the composite welding strip. The welding strip traction wheel set is located on the front side of the composite welding device, and the finished strip traction wheel set is located on the rear side of the cooling device. The welding strip traction wheel set and the finished strip traction wheel set each include two pressure rollers spaced apart and a traction motor for driving the pressure rollers to rotate. The pressure rollers clamp and press against the upper and lower surfaces of the first strip, the second strip, or the composite welding strip, respectively, to pull the corresponding first strip, the second strip, or the composite welding strip forward to the next process.

5. The continuous composite equipment for silver-based metal composite welding strips as described in claim 4, characterized in that, The traction guiding device further includes a sensing wheel for contact sensing of the first strip and controlling the start and stop of the traction motor of the pressure roller; the sensing wheel is disposed between the first strip unwinding device and the first spraying mechanism, and is located below the first strip. When the first strip sags due to excessive accumulation and contacts the sensing wheel, the sensing wheel sends a strip contact sensing signal to the control system, and the control system controls the traction motor to stop working.

6. The continuous composite equipment for silver-based metal composite welding strips as described in claim 4, characterized in that, The heating hood is equipped with a ventilation pipe for introducing protective inert gas or mixed protective gas, and an infrared thermometer for real-time temperature measurement is also provided above the heating hood; the cooling device includes a cooling hood, on which a cooling circulating water pipe is provided and connected to an external circulating cooling water source through the cooling circulating water pipe; the finished product winding device includes a winding drum for rotating and winding the cooled composite welding strip; the composite equipment also includes a waste gas recovery device for absorbing welding waste gas generated during continuous welding.

7. A composite method for a continuous composite equipment for silver-based metal composite welding strips as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Strip unwinding Control the strip unwinding device to release the first strip and the second strip respectively, ensuring stable conveying of the first strip and the second strip; S2: Flux Spraying The first spraying device and the second spraying device are controlled to uniformly spray flux onto the upper surfaces of the first strip and the second strip, respectively. S3: Strip mating and induction heating composite After the first and second strips are coated with flux, they are bonded together and enter the composite welding device. The composite welding device heats and performs composite welding on the strips to form a composite weld strip. S4: Cooling and winding After composite welding, the composite weld strip enters a cooling device for cooling and temperature reduction; the cooled composite weld strip is stably conveyed by a traction device to a winding device, and finally wound into a roll.

8. The composite method of the continuous composite equipment for silver-based metal composite welding strips as described in claim 7, characterized in that, The spraying flow rate of the first and second spraying devices is 5-10 ml / min; the strip traction speed is 1-5 m / min; and the heating temperature is 600-750℃.

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