Handheld laser welding device

Abstract

The invention provides a handheld laser welding device, belongs to the technical field of laser welding, and is used for solving the problems that in the prior art, a welding gun and a connector are integrated, so that the interchangeability between the welding gun and different laser hosts is greatly reduced, and the universality and flexibility of equipment are limited. The invention provides a handheld laser welding device which comprises a welding gun head and an output interface which are mutually matched and inserted, the other end of the welding gun head is used for welding, and the other end of the output interface is used for being connected with a host through a wire harness; the butt-inserting interface of the welding gun head and the output interface comprises a laser matching set, a cooling matching set, a shielding gas matching set and an electric signal matching set. The connection mode between the handheld welding gun and the laser host is optimized, and a standardized quick-plug connection interface is designed, so that high reliability of connection is reserved, and high interchangeability of the welding gun is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding, and in particular relates to a handheld laser welding device. Background Art

[0002] In the field of laser welding technology, the handheld welding gun is a core operating component, and its flexibility and reliability directly affect the efficiency and quality of welding operations. The welding gun and the laser host are connected through complex circuits, coolant pipelines and shielding gas delivery pipelines, with numerous interfaces. In order to improve the stability and reliability of the connection, the handheld welding gun and the pipeline are designed as an integrated whole in the traditional design. While the integrated design improves the connection reliability, it also brings new challenges. Due to the integration of the welding gun and the interface, the interchangeability between the welding gun and different laser hosts is greatly reduced, which limits the versatility and flexibility of the equipment. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a handheld laser welding device to solve the problem that the welding gun and the interface are integrated in the prior art, which greatly reduces the interchangeability between the welding gun and different laser hosts and limits the versatility and flexibility of the equipment.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a handheld laser welding device, comprising a welding gun head and an output interface that are mutually matched and plugged, the other end of the welding gun head is used for welding, and the other end of the output interface is used for connecting to a host through a wiring harness; The plug-in interface between the welding gun head and the output interface includes: a laser matching group, a cooling matching group, a protective gas matching group and an electrical signal matching group.

[0005] Optionally, the output interface includes a fiber seat and a fiber output tube, the fiber seat is provided with a fiber hole, the fiber hole penetrates the fiber seat axially, the fiber output tube is installed in the fiber hole, and both ends of the fiber output tube exceed the end surface of the fiber seat; The laser matching group includes: A laser channel provided on one side of the welding gun head; and, an optical fiber output tube provided at the output interface; When the welding gun head and the output interface are plugged into each other, the optical fiber output tube cooperates with the laser channel.

[0006] Optionally, the cooling matching group includes a first medium port and a second medium port provided on one side of the welding gun head, and a first cooling hole and a second cooling hole provided on one side of the optical fiber holder; The first cooling hole penetrates the optical fiber holder in the axial direction; The optical fiber output tube is provided with a first port at the tail end of the optical fiber seat, and a second port is provided at the matching part with the optical fiber seat, and the first port and the second port are connected in the optical fiber output tube; On the optical fiber holder, the second cooling hole is a blind hole punched from the head end to the tail end, and a third cooling hole is provided inside the optical fiber holder, one end of the third cooling hole is connected to the second cooling hole, and the other end is connected to the second port; On the welding gun head, the first medium port and the second medium port are connected to the inside of the welding gun head body and then communicated to form a loop; When the welding gun head and the output interface are plugged into each other, the first medium port and the second medium port are butted against the first cooling hole and the second cooling hole.

[0007] Optionally, on the optical fiber seat, an annular diameter expansion section is provided in the optical fiber hole, one of the outlets of the third cooling hole is located within the range of the annular diameter expansion section, and the second outlet of the optical fiber output tube is also located within the range of the annular diameter expansion section; And / or, the optical fiber output tube is provided with an annular diameter reduction section at the part cooperating with the optical fiber seat, one of the outlets of the third cooling hole is located in the range of the annular diameter reduction section, and the second outlet of the optical fiber output tube is also located in the range of the annular diameter reduction section.

[0008] Optionally, the optical fiber output tube comprises a tail section, a cooling section and an output section which are connected in sequence, the tail section is used to connect the optical fiber bundle and the host, the cooling section cools the end of the optical fiber bundle and the optical fiber crystal, and the output section converts the laser output by the optical fiber crystal into collimated light; The first port and the second port are both arranged in the cooling section.

[0009] Optionally, the cooling section comprises: An outer tube whose outer circumference matches the optical fiber holder; A cooling inner core is arranged in the outer tube and has a gap with the outer tube, the optical fiber passes through the cooling inner core, and the optical fiber crystal is arranged at the end of the cooling inner core and emits laser light; The cooling inner core and the outer tube are sealed at both ends, and the first opening and the second opening are both located at a gap portion between the outer tube and the cooling inner core.

[0010] Optionally, a tortuous flow channel structure is provided on the cooling core at a portion having a gap with the outer tube, and the medium enters the gap from the first port, flows along the axis of the cooling core to the other end, and then flows back in the opposite direction. After torturing at least once, the medium flows out of the gap from the second port.

[0011] Optionally, the flow channel structure includes a first sealing ring and a second sealing ring provided at both ends of the gap; It also includes a guide plate, which extends from the first blocking ring to the second blocking ring, and before contacting the second blocking ring, it changes to extend along the circumference, which part is called a reversing section, and then extends in the reverse direction toward the first blocking ring, and stops extending before contacting the first blocking ring; The height of the guide plate matches the inner diameter of the outer tube. Two groups of guide plates are arranged on the cooling core at an interval of 180 degrees. The first port is connected between the reversing section and the first sealing ring on one of the guide plates, and the second port is connected between the reversing section and the first sealing ring on the other guide plate.

[0012] Optionally, the protective gas matching group includes: A shielding gas interface provided on one side of the welding gun head; and, a protective air hole provided on the end face of the output interface; When the welding gun head and the output interface are plugged in, the shielding gas interface is butted against the shielding gas hole; On the welding gun head, the shielding gas interface enters the welding gun head body, exceeds the range of the protection mirror assembly and the focusing mirror assembly, and then enters the laser channel through the second connecting hole.

[0013] Optionally, the electrical signal coordination group includes: An electrical signal interface provided on one side of the welding gun head; and, a contact seat provided on the end surface of the output interface; When the welding gun head and the output interface are plugged into each other, the electrical signal interface is connected to the contact seat by electrical signals; A driving circuit board of the static ballast assembly is arranged on the welding gun head, and the circuit of the electrical signal interface is connected to the driving circuit board.

[0014] As described above, the handheld laser welding device of the present invention has at least the following beneficial effects: By optimizing the connection between the handheld welding gun and the laser host and designing a standardized quick-plug connection interface, the high reliability of the connection is retained while achieving high interchangeability of the welding gun. This technology not only reduces the complexity and maintenance cost of the system, but also improves the versatility and flexibility of the equipment, meeting the needs of different welding scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is an overall schematic diagram of the present invention.

[0016] Figure 2 Shown is a schematic diagram of the output interface of the present invention.

[0017] Figure 3 Shown is a schematic diagram of the disassembly of the output interface of the present invention.

[0018] Figure 4 A schematic cross-sectional view of the optical fiber holder of the output interface of the present invention is shown.

[0019] Figure 5 Shown is a schematic cross-sectional view of the optical fiber output tube of the output interface of the present invention.

[0020] Figure 6 It shows a schematic diagram of the disconnection and sectioning of the optical fiber output tube of the present invention.

[0021] Figure 7 Shown is a schematic diagram of the cooling inner core of the present invention.

[0022] Figure 8 It is a schematic diagram showing the circumference of the cooling inner core of the present invention unfolded into a plane.

[0023] Fig. 9 Shown is a schematic diagram of the welding gun head of the present invention.

[0024] Fig.10 Shown is a schematic diagram of the welding gun head of the present invention from another perspective.

[0025] Fig.11 Shown is a schematic cross-sectional view of the welding gun head body of the present invention.

[0026] Fig.12 Shown is a schematic diagram of the laser beam path of the welding gun head of the present invention.

[0027] Among them: optical fiber seat 1, optical fiber hole 10, annular expansion section 101, first cooling hole 11, second cooling hole 12, third cooling hole 13, protective gas hole 14, contact seat 151, optical fiber output tube 2, first port 20, second port 21, annular reduction section 22, outer tube 23, cooling inner core 24, first blocking ring 241, second blocking ring 242, guide plate 243, reversing section 2431, optical fiber crystal 26, first medium port 311, second medium port 312, second connecting hole 314, protective gas interface 315, electrical signal interface 316, galvanometer assembly 32. DETAILED DESCRIPTION

[0028] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0029] See also Figures 1 to 12. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0030] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0031] For this example, please refer to Figure 1 An embodiment of a handheld laser welding device provided by the present invention includes a welding gun head and an output interface that are plugged into each other, the other end of the welding gun head is used for welding, and the other end of the output interface is used to connect to the host through a wiring harness; the plug-in interface between the welding gun head and the output interface includes: a laser matching group, a cooling matching group, a protective gas matching group and an electrical signal matching group.

[0032] In the prior art, either the welding gun and the interface are designed as an integrated whole, or multiple scattered connection channels are set between the welding gun and the interface, and they are disconnected or connected one by one when the welding gun is replaced. In this solution, a high degree of interface integration is achieved by integrating multiple key functional components such as the laser matching group, the cooling matching group, the protective gas matching group and the electrical signal matching group into the end face of the welding gun head and the output interface. This design not only reduces the scattered layout between components, but also greatly simplifies the overall structure, making the system more compact and lightweight. In traditional welding systems, multiple interfaces often need to be connected one by one, which is not only time-consuming and labor-intensive, but also prone to errors. The interface is prone to failure and leakage during the use of the welding gun. In this embodiment, the welding gun and the interface can be connected to all interfaces at once, which greatly shortens the docking time and improves work efficiency. This not only simplifies the operation process, but also reduces the connection errors or leakage problems that may be caused by too many external interfaces. The standardized design of the interface not only facilitates the compatible use between different models of welding gun heads and output interfaces, but also promotes the modularization and serialization development of welding equipment, making users more flexible and convenient when replacing or upgrading equipment, and reducing maintenance costs.

[0033] See also Figure 9-12 , wherein one embodiment of the welding gun head is: The welding gun head includes a welding section 30 and a gripping section 31 which are interconnected and have a laser channel inside. The end of the welding section 30 is a welding nozzle 301. The end of the gripping section 31 is used to connect to the laser output interface. The gripping section 31 is also a handle when in use. The tail end of the laser output interface is connected to the laser welding host. The laser welding host provides control signals, coolant, laser beam and protective gas, etc.

[0034] The laser welding gun head further includes a galvanometer assembly 32 , a focusing lens assembly 33 and a protective lens assembly 34 .

[0035] The galvanometer assembly 32 is arranged at the connection between the welding section 30 and the grasping section 31, and reflects the laser emitted from the output interface in the laser channel in the grasping section 31 into the welding section 30; the galvanometer assembly 32 and the focusing lens assembly 33 are removably arranged in the welding section 30, and the laser emitted into the welding section 30 passes through the focusing lens assembly 33 and the protective lens assembly 34 and then enters the welding nozzle 301, and the laser energy melts the workpiece surface or the external welding wire, thereby realizing welding.

[0036] The galvanometer assembly 32 includes a galvanometer motor 321 and a galvanometer lens 322. The galvanometer lens 322 is a reflective lens. The galvanometer motor 321 is fixed on the shell, and the galvanometer lens 322 is connected to the output shaft of the galvanometer motor 321. Initially, the plane of the galvanometer lens 322 is perpendicular to the bisector of the angle between the axes of the welding section 30 and the gripping section 31, so that the laser beam propagates along the laser channel inside the welding gun head.

[0037] The focusing lens assembly 33 includes a first drawer box 331 and a focusing lens 332. The focusing lens is used to focus the laser beam, and the types include plano-convex lenses and compound lenses. The first drawer box 331 is provided with a through hole, and the focusing lens 332 is installed in the hole. The welding section 30 is provided with a first cavity 304 for the first drawer box 331 to be inserted. After the first drawer box 331 is inserted into the first cavity 304, the focusing lens 332 is concentric with the laser channel. After the first drawer box 331 is inserted into the first cavity 304, it is fixedly connected to the welding gun head body by screws, and screws that are convenient to tighten by hand can be used.

[0038] The protective lens assembly 34 includes a second drawer box 341 and a protective lens 342; the second drawer box 341 is provided with a through hole, and the protective lens 342 is installed in the hole; the welding section 30 is provided with a second cavity 305 for the second drawer box 341 to be inserted; after the second drawer box 341 is inserted into the second cavity 305, the protective lens 342 covers the laser channel. After the second drawer box 341 with the protective lens installed is inserted into the second cavity 305 on the welding gun head, it can be fixedly connected to the welding gun head body by screws, and screws that are convenient to tighten by hand can be used.

[0039] The welding section 30 of the welding gun head includes a body and a barrel 302 that cooperate with each other. The body is the hole end, and the barrel 302 is the shaft end. The barrel 302 can be detachably inserted into the body. A clamp structure 303 is provided on the body; when loosened, the barrel 302 can be inserted into the body, or taken out of the body; when tightened, the barrel 302 is fixed in the body. The barrel of the laser welding gun is a consumable part, mainly because it needs to withstand high temperature, high pressure and frequent energy impact during use. These factors can easily cause material fatigue, deformation or even melting, thereby affecting the welding quality and the life of the barrel. In addition, spatter, impurities, etc. during the welding process may also cause wear or blockage on the barrel wall, further accelerating its damage. Therefore, the detachable barrel of the laser welding gun can achieve more convenient maintenance and replacement to ensure the smooth progress of the welding operation.

[0040] The first medium port 311 and the second medium port 312 of the welding gun head are connected from the end of the gripping section 31 to the connection portion between the welding section 30 and the gripping section 31, and then connected to form a loop through the first connecting hole 313. Fig.11 and Fig.12 , the first connecting hole 313 is drilled from the outside of the welding gun head housing, and at the same time penetrates the ends of the first medium port 311 and the second medium port 312 to connect the two. Then, the opening of the first connecting hole 313 at the outer end of the housing is blocked to prevent the cooling medium from flowing out. As a better practice, the opening of the first connecting hole 313 on the housing can be blocked with a plug-shaped object encapsulated with a temperature sensor, and the temperature of the internal cooling medium is measured while the outlet is blocked. The welding machine host adjusts the temperature and flow of the cooling medium accordingly to maintain the best cooling effect.

[0041] The shielding gas interface 315 of the welding gun head passes from the end of the gripping section 31 into the connection between the welding section 30 and the gripping section 31, then enters the welding section 30, exceeds the range of the galvanometer assembly 32 and the focusing lens assembly 33, and finally passes into the laser channel through the second connecting hole 314. Fig.11 Finally, along with the laser beam, it reaches the welding point from the welding nozzle hole of the welding gun head, covers the welding part, and plays a protective role. The second connecting hole 314 runs from the outside of the shell to the inside of the shell, connects the shielding gas interface 315 and the laser channel in the center of the shell, and finally blocks the second connecting hole 314 outside the shell to prevent shielding gas leakage.

[0042] The wiring harness of the electrical signal interface 316 of the welding gun head is electrically connected to the drive board of the galvanometer assembly 32. A wiring harness terminal block is provided at the electrical signal interface 316, and a corresponding wiring harness terminal block is provided on the laser output interface at the other end that is plugged into the welding gun head. The two are plugged into each other to connect the welding gun and the welding host. At the connection between the welding section 30 and the gripping section 31, the channel in the welding section 30 passes through the shell to form a third cavity for installing the galvanometer assembly 32. The galvanometer assembly 32 includes a drive control board and an actuator. The actuator, that is, the galvanometer motor is installed from the third cavity. The actuator includes a galvanometer motor 321 and a galvanometer lens 322; the galvanometer motor 321 is fixed to the third cavity of the shell, and the galvanometer lens 322 is connected to the output shaft of the galvanometer motor 321. The galvanometer motor 321 controls the installation angle of the galvanometer lens 322. The entire galvanometer group is easy to disassemble and maintain.

[0043] See also Figure 2-5 , wherein one implementation of the output interface is: It comprises an optical fiber holder 1 and an optical fiber output tube 2; the optical fiber holder 1 is provided with an optical fiber hole 10, a first cooling hole 11, a second cooling hole 12 and a third cooling hole 13; the axial head end of the optical fiber holder 1 is used to connect a welding gun, and the tail end is used to connect a host through a harness; the optical fiber hole 10 and the first cooling hole 11 penetrate the optical fiber holder 1 axially, the optical fiber output tube 2 is installed in the optical fiber hole 10, and both ends extend beyond the end face of the optical fiber holder 1; the optical fiber output tube 2 is provided with a first port 20 at the tail end of the optical fiber holder 1, and a second port 21 is provided at the matching part with the optical fiber holder 1, and the first port 20 and the second port 21 are connected in the optical fiber output tube 2; on the optical fiber holder 1, the second cooling hole 12 is a blind hole punched from the head end to the tail end, and one end of the third cooling hole 13 is connected with the second cooling hole 12, and the other end is connected with the second port 21.

[0044] In the above implementation, one of the cooling loops does not directly penetrate the optical fiber holder 1 to connect to the welding gun head, but enters the optical fiber output tube 2 from the first port 20 at the rear end of the optical fiber output tube 2, circulates in the optical fiber output tube 2, and then returns to the matching position of the optical fiber output tube 2 and the optical fiber holder 1, flows into the optical fiber holder 1 from the second port 21, and then the optical fiber holder 1 provides an outlet (such as Figure 4The third cooling hole 13 and the second cooling hole 12 of the welding torch are connected to the welding torch, and the purpose is to dissipate heat for the optical fiber output tube 2. The optical fiber output tube 2 is the exchange interface for the laser to be emitted from the optical fiber bundle into the air. The tail end of the optical fiber output tube 2 is connected to the optical fiber, and the optical fiber is connected to the welding host, and the laser source is provided by the host; the head end of the optical fiber output tube 2 directly emits the laser from the optical fiber into the air. In the welding torch, a matching laser channel is provided, and the aperture of the laser channel matches the optical fiber output tube 2 to ensure concentric fit during insertion, and the laser beam path is accurate, and the laser can be reflected to the welding position. At the interface where the laser is emitted from the optical fiber bundle into the air, that is, at the head end of the optical fiber output tube 2, a special optical fiber crystal (or laser crystal) is provided to convert the laser beam. The laser crystal can use a commercial finished product, which is not the core of this solution, and providing heat dissipation for it is the key point. However, there is energy loss in this conversion process, which leads to an increase in the temperature of the optical fiber crystal and the optical fiber output tube 2. By circulating the cooling medium into the optical fiber output tube 2, the temperature of the optical fiber output tube 2 can be effectively controlled to ensure the reliability and stability of the output interface.

[0045] In the above-mentioned embodiments of the laser welding gun head and the output interface, the interfaces between each other integrate multiple interfaces that may be used by the laser welding gun, such as shielding gas, coolant, etc. These interfaces can be connected only by plugging in, and neither additional pipeline connections are required from the outside, nor secondary connection operations other than the plug-in connection are required. This not only simplifies the connection process, but also standardizes the interface. Different models of welding guns and welding machines can be quickly matched and used through this unified standardized interface.

[0046] The output interface integrates multiple functional interfaces required by the laser welding gun, such as shielding gas and coolant, etc. Through the simple plug-in connection method, the connection process is greatly optimized, achieving convenience and efficiency. This innovative design not only eliminates the cumbersome external pipeline layout and installation steps, but also completely eliminates the need for additional secondary connection operations, thereby improving work efficiency while reducing the risk of human error.

[0047] More significantly, the unified standardization of interfaces promotes seamless compatibility and rapid matching between different types of welding guns and welding machines, breaking the limitations of previous equipment due to interface integration design or interface differences, and providing users with more flexible and diverse choices. The realization of this standardization not only simplifies the complexity of equipment maintenance and upgrades, but also promotes the popularization and application of laser welding technology, and promotes the standardization process of the entire industry, which has far-reaching significance for improving industry efficiency, reducing costs, and enhancing market competitiveness.

[0048] The clever integration of cooling design significantly improves the overall stability of the laser welding interface. Through an efficient heat dissipation mechanism, the cooling design effectively reduces the heat accumulation generated by the laser crystal and key components during operation, avoiding the risk of performance degradation or failure due to overheating. This efficient temperature control not only extends the service life, but also ensures the stable output of the laser beam, thereby improving the accuracy and consistency of the welding operation. In addition, the optimization of the cooling design also promotes the balance of the internal environment of the system, reduces the mechanical stress caused by temperature changes, further consolidates the structural stability of the interface system, and provides a solid guarantee for high-quality and efficient welding operations.

[0049] In one embodiment of the handheld laser welding device, the laser matching set of the welding gun head and the output interface includes: A laser channel provided on one side of the welding gun head; and, an optical fiber output tube 2 protruding from the end surface of the output interface; When the welding gun head and the output interface are plugged in, the optical fiber output tube 2 cooperates with the laser channel. The optical fiber output tube 2 on the output interface is inserted into the laser channel on the welding gun head, and the laser beam is shot into the laser channel and is reflected by the galvanometer assembly on the welding gun head and focused by the focusing lens assembly before being shot out from the nozzle of the welding gun head for welding. The size of the optical fiber output tube 2 matches the laser channel, and the cooperation of the two can ensure that the laser beam is located at the center of the laser channel, so that the laser propagation direction is accurate, the accuracy of the docking of the matching parts is increased, and the safety of the use of the welding gun is improved.

[0050] At the same time, thanks to the flow of coolant in the optical fiber output tube 2, both the inner core and the outer layer of the optical fiber output tube 2 can be cooled. After the optical fiber output tube 2 is inserted into the welding gun head, the outer periphery of the optical fiber output tube 2 cooperates with the aperture of the laser channel on the welding gun head to absorb the heat on the welding gun head. The protruding optical fiber output tube 2 not only ensures the matching accuracy and ensures the accuracy of the laser path, but also enhances the heat dissipation of the welding gun head.

[0051] In one embodiment of the handheld laser welding device, the cooling matching group includes a first medium port 311 and a second medium port 312 provided on one side of the welding gun head, and a first cooling hole 11 and a second cooling hole 12 provided on one side of the optical fiber holder 1; the optical fiber hole 10 and the first cooling hole 11 penetrate the optical fiber holder 1 axially, the optical fiber output tube 2 is installed in the optical fiber hole 10, and both ends extend beyond the end face of the optical fiber holder 1; the optical fiber output tube 2 is provided with a first port 20 at the tail end of the optical fiber holder 1, and a second port 21 is provided at the matching part with the optical fiber holder 1, and the first port 2 0 and the second port 21 are connected in the optical fiber output tube 2; on the optical fiber holder 1, the second cooling hole 12 is a blind hole punched from the head end to the tail end, and a third cooling hole 13 is arranged inside the optical fiber holder 1, one end of the third cooling hole 13 is connected to the second cooling hole 12, and the other end is connected to the second port 21; on the welding gun head, the first medium port 311 and the second medium port 312 are connected to form a loop after being connected to the inside of the welding gun head body; when the welding gun head and the output interface are plugged in, the first medium port 311 and the second medium port 312 are connected to the first cooling hole 11 and the second cooling hole 12.

[0052] In the above embodiments, the specific cooling medium flow path can be found in Figure 4 and Figure 5 :The coolant enters the optical fiber output tube 2 from the first port 20, flows in the optical fiber output tube 2, and then flows from the optical fiber output tube 2 into the third cooling hole 13 on the optical fiber holder 1 at the second port 21 where the optical fiber output tube 2 and the optical fiber holder 1 match, and then flows out from the second cooling hole 12 on the optical fiber holder 1. The second cooling hole 12 is connected to the second medium port 312, and the coolant enters the inside of the welding gun head. Inside the welding gun head, the first medium port 311 and the second medium port 312 are connected from the end of the gripping section 31 to the connecting part of the welding section 30 and the gripping section 31, and then connected to form a loop by the first connecting hole 313. Therefore, the cooling medium entering the second medium port 312 will flow out from the first medium port 311 after circulating in the welding gun head, and then return to the output interface through the first cooling hole 11, and directly flow back to the welding host after passing through the optical fiber holder 1.

[0053] The coolant efficiently flows through the fiber output tube and the inside of the welding gun head, achieving multiple cooling of the laser crystal in the fiber output tube, the shell of the laser channel outside the fiber output tube, and the welding gun head body, effectively reducing the working temperature, especially the working temperature of the interface, and improving the stability and service life of laser welding. The coolant circulates through the precisely designed flow channel to ensure uniform and sufficient cooling effect, while reducing the damage to the equipment structure caused by thermal stress. Finally, the coolant is directly returned to the welding host through the reflux system, realizing the recycling of the coolant, saving energy and protecting the environment, and improving the operating efficiency and reliability of the overall system.

[0054] Furthermore, on the optical fiber holder 1, an annular diameter expansion section 101 is provided in the optical fiber hole 10, one of the outlets of the third cooling hole 13 is located in the range of the annular diameter expansion section 101, and the second port 21 on the optical fiber output tube 2 is also located in the range of the annular diameter expansion section 101; And / or, the optical fiber output tube 2 is provided with an annular diameter reduction section 22 at the part cooperating with the optical fiber holder 1 , one outlet of the third cooling hole 13 is located in the range of the annular diameter reduction section 22 , and the second port 21 on the optical fiber output tube 2 is also located in the range of the annular diameter reduction section 22 .

[0055] The second port 21 is arranged on the circumference of the optical fiber output tube 2 and is a liquid outlet. The third cooling hole 13 is arranged on the optical fiber holder 1 in the area matching with the optical fiber output tube 2 and is a liquid inlet. The annular diameter reduction section 22 / annular diameter expansion section 101 enables the matching area of ​​the optical fiber output tube 2 and the optical fiber holder 1 to form an annular communication area. When the cooling medium enters the annular diameter reduction section 22 / annular diameter expansion section 101 from the second port 21, it can circulate to one side of the third cooling hole 13, flow out from the second cooling hole 12, and then flow into one end of the welding gun docked with the output interface. On the optical fiber output tube 2, on both sides of the annular area where the third cooling hole 13 and the second port 21 are located, the matching interface of the optical fiber holder 1 and the optical fiber output tube 2 is provided with a first sealing ring 90, which can prevent the cooling medium in the annular diameter reduction section 22 / annular diameter expansion section 101 from leaking along the axial direction.

[0056] The two sides of the connection point between the third cooling hole 13 and the second port 21 are approximately 180 degrees apart. The purpose is to facilitate the design of the flow channel inside the optical fiber output tube 2 so that the flow path of the cooling liquid inside the optical fiber output tube 2 is longer and fully covers the surface of the inner core.

[0057] Furthermore, the optical fiber output tube 2 includes a tail section, a cooling section and an output section connected in sequence, the tail section is used to connect the optical fiber harness and the host, the cooling section cools the end of the optical fiber harness and the optical fiber crystal 26, and the output section converts the laser output by the optical fiber crystal 26 into collimated light, and spherical lenses, aspherical lenses and cylindrical lenses can be used, and reference can be made to the collimator in the prior art. The collimator itself is not the core point of this solution; the first port 20 and the second port 21 are both set in the cooling section. The first port 20 is located at the rear of the optical fiber seat 1 and the optical fiber output tube 2, and the second port 21 is located at the optical fiber seat 1 and the optical fiber output tube 2.

[0058] The cooling section can be found in Figure 5 and Figure 6 ,include: An outer tube 23 whose outer circumference matches the optical fiber holder 1; The cooling inner core 24 is arranged in the outer tube 23 and has a gap with the outer tube 23. The optical fiber passes through the cooling inner core 24. The optical fiber crystal 26 is arranged at the end of the cooling inner core 24 and emits the laser. The optical fiber crystal 26 and the cooling inner core 24 are integrated, so they can conduct heat to each other. In order to speed up the heat dissipation efficiency, the cooling inner core 24 can be made of a high thermal conductivity material, such as metal, such as copper; The cooling core 24 and the outer tube 23 are sealed at both ends to prevent leakage of the coolant. The first port 20 and the second port 21 are both located in the gap between the outer tube 23 and the cooling core 24. Therefore, after the coolant flows in from one of the ports, it can flow out from the other port, absorbing the heat of the cooling core 24 in the process.

[0059] Furthermore, a circuitous flow channel structure is provided on the cooling core 24 at a portion having a gap with the outer tube 23. The medium enters the gap from the first port 20, flows along the axis of the cooling core 24 to the other end, and then flows back in the opposite direction. After circuitously making at least one circuit, the medium flows out of the gap from the second port 21.

[0060] The main principles of the above embodiment are as follows: Figure 3 , Figure 4 The first port 20 is located at the tail end of the optical fiber output tube 2. The coolant enters the gap between the cooling inner core 24 and the outer tube 23 from the first port 20, flows in the circuitous flow channel structure in the gap, and absorbs the heat generated by the optical fiber crystal 26 in the cooling inner core 24. Then, it reaches the second port 21 and flows out. The second port 21 is located at the annular reduction section 22 / annular expansion section 101 where the optical fiber output tube 2 and the optical fiber holder 1 cooperate. Therefore, the coolant can flow in a circle here, and then reaches the third cooling hole 13 on the optical fiber holder 1, and flows to the second cooling hole 12 through the third cooling hole 13, and then enters the welding gun at the butt end to circulate, and then flows out from the welding gun, enters the first cooling hole 11, passes through the optical fiber holder 1, and flows back to the welding host through the pipeline, thereby forming a cooling cycle.

[0061] The cooling system designed in this embodiment significantly improves the thermal management efficiency and stability of the optical fiber interface through clever flow channel layout and structural integration. Specifically, the coolant is accurately introduced from the first port, making full use of the complex and efficient circuitous flow channel between the cooling inner core and the outer tube, achieving immediate and comprehensive absorption of the heat generated by the optical fiber crystal, effectively reducing the operating temperature, and ensuring the performance and life of the optical fiber component. In particular, when the coolant flows through the annular reduction / expansion section at the junction of the optical fiber output tube and the optical fiber holder, its circumferential flow characteristics internalize the flow channel, avoid external interfaces, simplify the structure, and improve stability.

[0062] In addition, through the careful layout and seamless connection of the third cooling hole, the second cooling hole to the first cooling hole, the coolant smoothly enters the welding gun and completes the circulation. This process not only realizes the completely closed-loop circulation of the coolant, but also significantly simplifies the external connection of the cooling system, avoids the risk of leakage of pipelines and possible leakage caused by complicated pipelines, and improves the reliability and maintenance convenience of the overall system.

[0063] The cooling system of this embodiment achieves a high degree of integration of the coolant structure and comprehensive coverage of the cooling channel, which not only accurately controls the temperature fluctuation of the interface during the welding process, ensuring the high quality and consistency of the optical fiber welding, but also greatly optimizes the complexity and operating efficiency of the system, providing a more stable, efficient and economical optical fiber interface solution for welding work.

[0064] For further information, see Figure 6-8 The flow channel structure includes a first sealing ring 241 and a second sealing ring 242 arranged at both ends of the gap; it also includes a guide plate 243, the guide plate 243 extends from the first sealing ring 241 to the second sealing ring 242, and before contacting the second sealing ring 242, it changes to extend along the circumference, this part is called the reversing section 2431, and then extends in the opposite direction toward the first sealing ring 241, and stops extending before contacting the first sealing ring 241; the height of the guide plate 243 matches the inner diameter of the outer tube 23, and the height of the guide plate 243 is correspondingly reduced where the inner diameter of the outer tube 23 is small, and two groups of guide plates 243 are arranged on the cooling core 24 at an interval of 180 degrees, the first port 20 is connected between the reversing section 2431 on one of the guide plates 243 and the first sealing ring 241, and the second port 21 is connected between the reversing section 2431 on the other guide plate 243 and the first sealing ring 241.

[0065] In the above embodiment, the flow path of the cooling medium is as follows: Figure 8 , Figure 8 For the general Figure 7 The flow channel layout after the cooling flow channel section of the middle cylindrical cooling core 24 is unfolded into a plane, it should be noted that Figure 8 In the figure, the upper side line and the lower side line are the same side line, which is the cylindrical expansion line. The two ends of the gap between the cooling inner core 24 and the outer tube 23 are isolated by the first sealing ring 241 and the second sealing ring 242 respectively. The coolant enters from the first port 20 and flows along the Figure 8 The middle dotted line flows toward the first sealing ring 241, and after reaching the first sealing ring 241, it flows in the reverse direction along the dotted line toward the second sealing ring 242, and after reaching the second sealing ring 242, it flows toward the upper side or the lower side in the figure (actually, when the unfolded plane is restored to a cylindrical shape, the upper side and the lower side in the figure are the same side), and then reverses again and flows toward the first sealing ring 241, and after reaching the first sealing ring 241, it reverses again and enters Figure 8The coolant flows in a dead end on the middle and lower guide plate 243 and out from the second port 21. The second port 21 is located at the annular reduced diameter section 22 / annular expanded diameter section 101 where the optical fiber output tube 2 cooperates with the optical fiber holder 1. Therefore, the coolant can flow in a circle here, and then reach the third cooling hole 13 on the optical fiber holder 1, and flow to the second cooling hole 12 through the third cooling hole 13, and then enter the welding gun at the butt end to circulate, and then flow out from the welding gun, enter the first cooling hole 11, pass through the optical fiber holder 1, and flow back to the welding host through the pipeline, thereby forming a cooling cycle.

[0066] The subtlety of the above-mentioned flow channel design lies in that it ensures that the cooling medium can achieve all-round, non-dead-angle reciprocating flow along the surface of the cooling core. This feature greatly enhances the cooling effect and achieves efficient and uniform thermal management of the laser crystal. This not only effectively avoids local overheating and ensures the optimal working state and long-term stability of the laser crystal, but also promotes the precise control of the interface temperature during the welding process, improving the welding quality and production efficiency. At the same time, the full coverage cooling strategy also extends the service life of the equipment, reduces maintenance costs, and brings significant economic benefits and competitive advantages to users.

[0067] Furthermore, on the cooling core 24, a raised strip 244 is provided along the axial direction. The height range of the raised strip 244 is smaller than the inner diameter of the outer tube 23. The two ends of the raised strip 244 do not contact the first sealing ring 241 and the second sealing ring 242, and do not change the direction of the flow channel. The raised strip cleverly matches the flow direction of the cooling medium. It not only serves as a natural guide to guide the medium to smoothly shuttle through the cooling system, reducing flow resistance and loss, but also significantly increases the contact area between the cooling medium and the cooling core through its unique shape. This design greatly promotes the transfer and exchange of heat, resulting in a qualitative leap in heat exchange efficiency, ensuring that the laser crystal can maintain a stable low temperature state under extreme working conditions, thereby improving the performance and reliability of the overall system, and bringing more outstanding performance and efficiency to the field of high-precision and high-power processing.

[0068] In this embodiment, Fig.11 As shown, the protective gas matching group includes: A shielding gas interface 315 provided on one side of the welding gun head; and, a protective air hole 14 provided on the end face of the output interface, the protective air hole 14 being located at the end face of the optical fiber holder 1 and provided with a sealing ring 91; When the welding gun head and the output interface are plugged in, the shielding gas interface 315 is connected to the shielding gas hole 14; On the welding gun head, the shielding gas interface 315 enters the welding gun head body, exceeds the range of the shielding mirror assembly and the focusing mirror assembly, and then enters the laser channel through the second connecting hole 314.

[0069] The shielding gas interface 315 passes from the end of the gripping section 31 to the connection between the welding section 30 and the gripping section 31, then enters the welding section 30, exceeds the range of the galvanometer assembly 32 and the focusing lens assembly 33, and finally passes through the second connecting hole 314 to the laser channel, and finally follows the laser beam to reach the welding point from the welding nozzle hole of the welding gun head, covering the welding part to play a protective role. The second connecting hole 314 runs from the outside of the shell to the inside of the shell, connecting the shielding gas interface 315 with the laser channel in the center of the shell, and finally blocks the second connecting hole 314 outside the shell to prevent shielding gas leakage.

[0070] For this example, please refer to Figure 1 and Figure 2 , combined with Fig.11 and Fig.12 , the electrical signal coordination group includes: An electrical signal interface 316 provided on one side of the welding gun head; and, a contact seat 151 provided on the end surface of the output interface; When the welding gun head and the output interface are plugged in, the electrical signal interface 316 is connected to the contact seat 151 by electrical signal, and a hole 15 for installing the contact seat 151 can be set on the optical fiber seat; A driving circuit board of a galvanometer motor assembly is arranged on the welding gun head, and the circuit of the electrical signal interface 316 is connected to the driving circuit board. The driving circuit board can be arranged on the housing where the galvanometer assembly is installed, and one side of the driving circuit board is close to the galvanometer motor. The driving circuit board can be installed outside the third cavity, and the galvanometer motor is loaded from the third cavity. The galvanometer assembly is a special optical device, more specifically, it is a special reflective lens controlled by a swing motor. Unlike ordinary rotary motors, the rotor of the galvanometer cannot achieve complete rotation, but can only deflect. The angle of this deflection is proportional to the current passing through the galvanometer motor, so the galvanometer is also called a galvanometer scanner. When the electrical signal acts on the galvanometer motor through the driving circuit board, it drives the galvanometer lens to swing (vibrate) at an extremely high speed, thereby changing the direction of the light beam. The galvanometer assembly can significantly improve the accuracy and efficiency of welding. Specifically, the galvanometer assembly can achieve precise orientation of the reflection direction of the laser beam and accurately focus the laser beam on the template welding point, which is crucial to improving the welding quality. In addition, the high-speed response and precise control characteristics of the galvanometer make the welding process more flexible and efficient, and can cope with complex and changing welding requirements. In the prior art, the driving circuit board of the galvanometer motor is generally set in the welding host, connected to the output interface from the welding host through a wiring harness, and then connected to the galvanometer motor through the docking of the output interface and the welding gun head. The analog signal between the galvanometer motor and the driving circuit board in the welding host is used to control the action of the galvanometer motor. After long-distance transmission, the signal is easily interfered, resulting in a decrease in the accuracy of the galvanometer motor's response to the control signal.

[0071] In this embodiment, the driving circuit board for controlling the movement of the galvanometer motor is arranged on the welding gun head, and the driving circuit board is close to the galvanometer motor, so the analog signal is not easily interfered. The driving circuit board and the welding host can communicate through digital signals, such as using Modbus bus, Profibus bus or CAN bus with corresponding communication protocols to ensure the accuracy and integrity of the control signal, so that the galvanometer motor can accurately respond to the control signal and improve the welding quality.

[0072] In summary, the present invention effectively overcomes various shortcomings in the prior art, can produce beneficial technical effects, and has significant progress.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A handheld laser welding device, characterized in that: It includes a welding gun head and an output interface that are plugged into each other, the other end of the welding gun head is used for welding, and the other end of the output interface is used to connect to the host through a wiring harness; The plug-in interface between the welding gun head and the output interface includes: a laser matching group, a cooling matching group, a protective gas matching group and an electrical signal matching group.

2. A handheld laser welding device as claimed in claim 1, characterized in that: The output interface comprises an optical fiber seat (1) and an optical fiber output tube (2); the optical fiber seat (1) is provided with an optical fiber hole (10), the optical fiber hole (10) penetrates the optical fiber seat (1) along the axial direction, and the optical fiber output tube (2) is installed in the optical fiber hole (10), and both ends of the optical fiber output tube (2) extend beyond the end surface of the optical fiber seat (1); The laser matching group includes: A laser channel provided on one side of the welding gun head; and, an optical fiber output tube (2) provided at the output interface; When the welding gun head and the output interface are plugged into each other, the optical fiber output tube (2) cooperates with the laser channel.

3. A handheld laser welding device as claimed in claim 2, characterized in that: The cooling matching group comprises a first medium port (311) and a second medium port (312) provided on one side of the welding gun head, and a first cooling hole (11) and a second cooling hole (12) provided on one side of the optical fiber holder (1); The first cooling hole (11) penetrates the optical fiber holder (1) in the axial direction; The optical fiber output tube (2) is provided with a first opening (20) at the tail end of the optical fiber seat (1), and a second opening (21) is provided at the matching portion with the optical fiber seat (1), and the first opening (20) and the second opening (21) are connected in the optical fiber output tube (2); On the optical fiber holder (1), the second cooling hole (12) is a blind hole punched from the head end to the tail end, and a third cooling hole (13) is provided inside the optical fiber holder (1), one end of the third cooling hole (13) is connected to the second cooling hole (12), and the other end is connected to the second port (21); On the welding gun head, the first medium port (311) and the second medium port (312) are connected to the inside of the welding gun head body and then communicated to form a loop; When the welding gun head and the output interface are plugged in, the first medium port (311) and the second medium port (312) are butted against the first cooling hole (11) and the second cooling hole (12).

4. A handheld laser welding device as claimed in claim 3, characterized in that: On the optical fiber seat (1), an annular diameter expansion section (101) is provided in the optical fiber hole (10), one of the outlets of the third cooling hole (13) is located within the range of the annular diameter expansion section (101), and the second port (21) on the optical fiber output tube (2) is also located within the range of the annular diameter expansion section (101); And / or, the optical fiber output tube (2) is provided with an annular diameter reduction section (22) at a portion cooperating with the optical fiber holder (1), one of the outlets of the third cooling hole (13) is located within the range of the annular diameter reduction section (22), and the second port (21) on the optical fiber output tube (2) is also located within the range of the annular diameter reduction section (22).

5. A handheld laser welding device as claimed in claim 4, characterized in that: The optical fiber output tube (2) comprises a tail section, a cooling section and an output section which are connected in sequence, the tail section being used to connect the optical fiber bundle and the host, the cooling section cooling the end of the optical fiber bundle and the optical fiber crystal (26), and the output section converting the laser output by the optical fiber crystal (26) into collimated light; The first port (20) and the second port (21) are both arranged in the cooling section.

6. A handheld laser welding device as claimed in claim 5, characterized in that: The cooling section comprises: An outer tube (23) whose outer circumference cooperates with the optical fiber holder (1); A cooling inner core (24) is disposed in the outer tube (23) and has a gap with the outer tube (23), the optical fiber passes through the cooling inner core (24), and the optical fiber crystal (26) is disposed at the end of the cooling inner core (24) and emits laser light; The cooling inner core (24) and the outer tube (23) are sealed at both ends, and the first port (20) and the second port (21) are both located at a gap portion between the outer tube (23) and the cooling inner core (24).

7. A handheld laser welding device as claimed in claim 6, characterized in that: A portion of the cooling inner core (24) having a gap with the outer tube (23) is provided with a circuitous flow channel structure, wherein the medium enters the gap portion from the first port (20), flows along the axis of the cooling inner core (24) to the other end, and then flows back in the opposite direction, and after circuitously making at least one circuitous movement, flows out of the gap portion from the second port (21).

8. A handheld laser welding device as claimed in claim 7, characterized in that: The flow channel structure comprises a first sealing ring (241) and a second sealing ring (242) arranged at both ends of the gap; It also comprises a guide plate (243), the guide plate (243) extending from the first sealing ring (241) toward the second sealing ring (242), and before contacting the second sealing ring (242), changing to extend along the circumference, this part is called the reversing section (2431), and then extending in the reverse direction toward the first sealing ring (241), and stopping extending before contacting the first sealing ring (241); The height of the guide plate (243) matches the inner diameter of the outer tube (23); two groups of guide plates (243) are arranged on the cooling inner core (24) at an interval of 180 degrees; the first port (20) is connected between the reversing section (2431) and the first sealing ring (241) on one of the guide plates (243); and the second port (21) is connected between the reversing section (2431) and the first sealing ring (241) on the other guide plate (243).

9. A handheld laser welding device as claimed in claim 1, characterized in that: The protective gas matching group includes: A shielding gas interface (315) provided on one side of the welding gun head; and, a protective air hole (14) provided on the end surface of the output interface; When the welding gun head and the output interface are plugged into each other, the shielding gas interface (315) is butted against the shielding gas hole (14); On the welding gun head, the protective gas interface (315) enters the welding gun head body, exceeds the range of the protective mirror assembly and the focusing mirror assembly, and then enters the laser channel through the second connecting hole (314).

10. A handheld laser welding device as claimed in claim 1, characterized in that: The electrical signal coordination group comprises: An electrical signal interface (316) provided on one side of the welding gun head; and, a contact seat (151) provided on the end surface of the output interface; When the welding gun head and the output interface are plugged into each other, the electrical signal interface (316) is electrically connected to the contact seat (151); A driving circuit board of a galvanometer motor assembly is arranged on the welding gun head, and the circuit of the electrical signal interface (316) is connected to the driving circuit board.

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