A hand-held laser welding device

Abstract

The present invention provides a handheld laser welding device, belonging to the technical field of laser welding, which is used to solve the problem that in the prior art, the integration of the welding torch and the interface greatly reduces the interchangeability between the welding torch and different laser hosts, restricting the versatility and flexibility of the equipment. The present invention provides a handheld laser welding device, comprising a welding torch head and an output interface that are inserted into each other in a matching manner. The other end of the welding torch head is used for welding, and the other end of the output interface is used for connecting to the host through a wire harness; the insertion interface between the welding torch head and the output interface includes: a laser matching group, a cooling matching group, a shielding gas matching group, and an electrical signal matching group. By optimizing the connection method between the handheld welding torch and the laser host and designing a standardized quick plug-and-play connection interface, both the high reliability of the connection and the high interchangeability of the welding torch are achieved.

Description

Technical Field

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

[0002] In the technical field of laser welding, as the core operating component, the flexibility and reliability of the handheld welding torch directly affect the efficiency and quality of the welding operation. The welding torch is connected to the laser host through complex circuits, coolant pipelines, and shielding gas delivery pipelines, with numerous interfaces. In order to improve the connection stability and reliability, in traditional designs, the handheld welding torch and the pipelines are integrally designed. While the integral design brings an improvement in connection reliability, it also poses new challenges. Due to the integration of the welding torch and the interfaces, the interchangeability between the welding torch and different laser hosts is greatly reduced, restricting the versatility and flexibility of the equipment. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a handheld laser welding device to solve the problem in the prior art that the integration of the welding torch and the interfaces greatly reduces the interchangeability between the welding torch and different laser hosts, restricting 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, including a welding torch head and an output interface that are inserted and matched with each other. The other end of the welding torch head is used for welding, and the other end of the output interface is used to connect to the host through a wire harness;

[0005] The insertion interface of the welding torch head and the output interface includes: a laser cooperation group, a cooling cooperation group, a shielding gas cooperation group, and an electrical signal cooperation group.

[0006] Optionally, the output interface includes an optical fiber seat and an optical fiber output tube. The optical fiber seat is provided with an optical fiber hole that axially penetrates the optical fiber seat. The optical fiber output tube is installed in the optical fiber hole, and both ends extend beyond the end face of the optical fiber seat;

[0007] The laser cooperation group includes:

[0008] A laser channel provided on one side of the welding torch head;

[0009] And, an optical fiber output tube provided on the output interface;

[0010] When the welding torch head and the output interface are inserted and matched, the optical fiber output tube cooperates with the laser channel.

[0011] Optionally, the cooling cooperation group includes a first medium port and a second medium port provided on one side of the welding torch head, and a first cooling hole and a second cooling hole provided on one side of the optical fiber seat;

[0012] The first cooling hole axially penetrates through the fiber optic seat.

[0013] The fiber optic output tube is provided with a first port at the tail end portion of the fiber optic seat and a second port at the portion mating with the fiber optic seat, and the first port and the second port communicate with each other inside the fiber optic output tube.

[0014] On the fiber optic seat, the second cooling hole is a blind hole drilled from the head end to the tail end, and a third cooling hole is provided inside the fiber optic seat. One end of the third cooling hole communicates with the second cooling hole, and the other end communicates with the second port.

[0015] On the welding torch head, the first medium port and the second medium port communicate with each other to form a loop after entering the inside of the welding torch head body.

[0016] When the welding torch head and the output interface are inserted into each other, the first medium port and the second medium port are docked with the first cooling hole and the second cooling hole.

[0017] Optionally, on the fiber optic seat, an annular diameter-expanded section is provided inside the fiber optic hole, one outlet of the third cooling hole is located within the range of the annular diameter-expanded section, and the second port on the fiber optic output tube is also located within the range of the annular diameter-expanded section.

[0018] And / or, on the fiber optic output tube, an annular diameter-reduced section is provided at the portion mating with the fiber optic seat, one outlet of the third cooling hole is located within the range of the annular diameter-reduced section, and the second port on the fiber optic output tube is also located within the range of the annular diameter-reduced section.

[0019] Optionally, the fiber optic output tube includes a tail section, a cooling section, and an output section connected in sequence. The tail section is used to connect the fiber optic harness and the host, the cooling section cools the end of the fiber optic harness and the fiber crystal, and the output section converts the laser output by the fiber crystal into collimated light.

[0020] Both the first port and the second port are provided on the cooling section.

[0021] Optionally, the cooling section includes:

[0022] An outer tube whose outer periphery mates with the fiber optic seat;

[0023] A cooling inner core disposed inside the outer tube and having a gap with the outer tube. The optical fiber passes through the cooling inner core, and the fiber crystal is disposed at the end of the cooling inner core and emits laser light.

[0024] The two ends of the cooling inner core and the outer tube are hermetically fitted, and both the first port and the second port are located at the portion where the outer tube and the cooling inner core have a gap.

[0025] Optionally, on the cooling inner core, at the part with a gap from the outer tube, a tortuous flow channel structure is provided. The medium enters the gap part from the first port, flows along the axis of the cooling inner core towards the other end, then flows back in the reverse direction, and after such tortuous flow for at least once, flows out of the gap part from the second port.

[0026] Optionally, the flow channel structure includes a first sealing ring and a second sealing ring provided at both ends of the gap part;

[0027] It further includes a guiding plate. The guiding plate extends from the first sealing ring towards the second sealing ring. Before contacting the second sealing ring, it changes to extend along the circumference. This part is called the commutation section, and then it extends in the reverse direction towards the first sealing ring and stops extending before contacting the first sealing ring;

[0028] The height of the guiding plate matches the inner diameter of the outer tube. Two groups of the guiding plates are provided on the cooling inner core at an interval of 180 degrees. The first port is communicated between the commutation section and the first sealing ring on one of the guiding plates, and the second port is communicated between the commutation section and the first sealing ring on the other guiding plate.

[0029] Optionally, the protective gas matching group includes:

[0030] A protective gas interface provided on one side of the welding torch head;

[0031] And a protective gas hole provided on the end face of the output interface;

[0032] When the welding torch head and the output interface are inserted into each other, the protective gas interface is docked with the protective gas hole;

[0033] On the welding torch head, after the protective gas interface enters the welding torch head body and exceeds the ranges of the protective mirror assembly and the focusing mirror assembly, it enters the laser channel through the second communication hole.

[0034] Optionally, the electrical signal matching group includes:

[0035] An electrical signal interface provided on one side of the welding torch head;

[0036] And a contact seat provided on the end face of the output interface;

[0037] When the welding torch head and the output interface are inserted into each other, the electrical signal interface is electrically connected to the contact seat;

[0038] On the welding torch head, a driving circuit board of the calming motor assembly is provided, and the circuit of the electrical signal interface is connected to the driving circuit board.

[0039] As described above, a handheld laser welding device of the present invention has at least the following beneficial effects:

[0040] By optimizing the connection method between the handheld welding torch and the laser mainframe, a standardized quick plug-and-play connection interface is designed, which not only retains the high reliability of the connection but also realizes the high interchangeability of the welding torch. This technology not only reduces the complexity of the system and maintenance costs but also improves the versatility and flexibility of the equipment, meeting the requirements of different welding scenarios. Brief Description of the Drawings

[0041] Figure 1 It shows a schematic diagram of the whole of the present invention.

[0042] Figure 2 It shows a schematic diagram of the output interface of the present invention.

[0043] Figure 3 It shows a disassembled schematic diagram of the output interface of the present invention.

[0044] Figure 4 It shows a sectional view of the optical fiber seat of the output interface of the present invention.

[0045] Figure 5 It shows a sectional view of the optical fiber output tube of the output interface of the present invention.

[0046] Figure 6 It shows a schematic diagram of the disconnection and section of the optical fiber output tube of the present invention.

[0047] Figure 7 It shows a schematic diagram of the cooling inner core of the present invention.

[0048] Figure 8 It shows a schematic diagram of the circumferential unfolding of the cooling inner core of the present invention into a plane.

[0049] Figure 9 It shows a schematic diagram of the welding torch head of the present invention.

[0050] Figure 10 It shows a schematic diagram of another perspective of the welding torch head of the present invention.

[0051] Figure 11 It shows a sectional view of the welding torch head body of the present invention.

[0052] Figure 12 It shows a schematic diagram of the laser beam path of the welding torch head of the present invention.

[0053] Wherein: fiber optic seat 1, fiber optic hole 10, annular diameter-expanded section 101, first cooling hole 11, second cooling hole 12, third cooling hole 13, protective air hole 14, contact seat 151, fiber optic output tube 2, first port 20, second port 21, annular diameter-reduced section 22, outer tube 23, cooling inner core 24, first sealing ring 241, second sealing ring 242, guiding plate 243, commutation section 2431, fiber optic crystal 26, first medium port 311, second medium port 312, second communication hole 314, protective gas interface 315, electrical signal interface 316, galvanometer assembly 32. Detailed implementation manners

[0054] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0055] Please refer to Figures 1 to 12 It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present invention.

[0056] The following individual embodiments are only for illustration. Combinations can be made between the individual embodiments, and it is not limited to the content shown in the following single embodiment.

[0057] In this embodiment, 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 inserted into each other in a matching manner. 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 a host through a wire harness; the insertion interface between the welding gun head and the output interface includes: a laser cooperation group, a cooling cooperation group, a protective gas cooperation group, and an electrical signal cooperation group.

[0058] In the prior art, either the welding torch and the interface are integrally designed, or multiple scattered connection channels are provided between the welding torch and the interface, and they are disconnected or connected one by one when replacing the welding torch. In this solution, by integrating multiple key functional components such as the laser cooperation group, the cooling cooperation group, the shielding gas cooperation group, and the electrical signal cooperation group into the mating end faces of the welding torch head and the output interface, a high degree of interface integration is achieved. 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 laborious, but also error-prone. During the use of the welding torch, the interfaces are prone to failure and leakage. In this embodiment, all interfaces can be connected by mating the welding torch and the interface once, which greatly shortens the docking time and improves work efficiency. This not only simplifies the operation process, but also reduces problems such as connection errors or leakage that may be caused by too many external interfaces. The standardized design of the interface not only facilitates the compatible use between different types of welding torch heads and output interfaces, but also promotes the modular and serialized development of welding equipment, making it more flexible and convenient for users to replace or upgrade equipment and reducing the maintenance cost.

[0059] Please refer to Figures 9 - 12 , in which, one implementation of the welding torch head is as follows:

[0060] The welding torch head includes a welding section 30 and a gripping section 31 that are connected to each other 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 the handle during use. The tail end of the laser output interface is connected to the laser welding host, and the laser welding host provides control signals, coolant, laser beam, shielding gas, etc.

[0061] The laser welding torch head further includes a galvanometer assembly 32, a focusing lens assembly 33, and a protective lens assembly 34.

[0062] The galvanometer assembly 32 is arranged at the connection between the welding section 30 and the gripping section 31, and reflects the laser beam that enters from the output interface in the laser channel inside the gripping 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. The laser beam that enters the welding section 30 passes through the focusing lens assembly 33 and the protective lens assembly 34 and then enters the welding nozzle 301. The laser energy melts the surface of the workpiece or the externally added welding wire, thereby realizing welding.

[0063] The galvanometer assembly 32 includes a galvanometer motor 321 and a galvanometer mirror 322. The galvanometer mirror 322 is a reflecting mirror. The galvanometer motor 321 is fixed on the housing, and the galvanometer mirror 322 is connected to the output shaft of the galvanometer motor 321. Initially, the plane of the galvanometer mirror 322 is perpendicular to the angular 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 torch head.

[0064] 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 its types include plano-convex lenses, compound lenses, etc. A through hole is provided on the first drawer box 331, and the focusing lens 332 is installed in the hole. On the welding section 30, there is a first cavity 304 for the first drawer box 331 to be inserted into. 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 torch head body by screws, and screws that are convenient for hand tightening can be used.

[0065] The protective lens assembly 34 includes a second drawer box 341 and a protective lens 342. A through hole is provided on the second drawer box 341, and the protective lens 342 is installed in the hole. On the welding section 30, there is a second cavity 305 for the second drawer box 341 to be inserted into. 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 for installing the protective lens is inserted into the second cavity 305 on the welding torch head, it can be fixedly connected to the welding torch head body by screws, and screws that are convenient for hand tightening can be used.

[0066] The welding section 30 of the welding torch head includes a mutually cooperating body and a barrel 302. The body is the hole end, and the barrel 302 is the shaft end. The barrel 302 is 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 from the body. When tightened, the barrel 302 is fixed in the body. The laser welding torch barrel is a consumable part mainly because it needs to withstand high temperature, high pressure and frequent energy impacts during use. These factors can easily cause material fatigue, deformation or even melting, thus 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 to the gun barrel wall, further accelerating its damage. Therefore, the detachable laser welding torch barrel enables more convenient maintenance and replacement to ensure the smooth progress of the welding operation.

[0067] The first medium port 311 and the second medium port 312 of the welding torch head lead into the connecting part of the welding section 30 and the gripping section 31 from the end of the gripping section 31, and then are connected into a loop by the first communication hole 313. Figure 11 and Figure 12 , the first communication hole 313 is drilled from the outside of the welding torch head housing and penetrates through the ends of the first medium port 311 and the second medium port 312 to connect the two. Then, the opening of the first communication 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 communication hole 313 on the housing can be blocked with a plug-shaped object encapsulating a temperature sensor, measuring the temperature of the internal cooling medium while blocking the outlet. The welding machine mainframe adjusts the temperature and flow rate of the cooling medium accordingly to maintain the best cooling effect.

[0068] The shielding gas interface 315 of the welding torch head enters from the end of the gripping section 31 into the connection part of the welding section 30 and the gripping section 31, then enters the welding section 30. After exceeding the range of the galvanometer assembly 32 and the focusing lens assembly 33, finally, it enters the laser channel through the second communication hole 314. Refer to Figure 11 . Finally, together with the laser beam, it reaches the welding point from the nozzle hole of the welding torch head, covers the welding part, and plays a protective role. The second communication hole 314 penetrates from the outside of the housing to the inside of the housing, connects the shielding gas interface 315 and the laser channel at the center of the housing, and finally blocks the second communication hole 314 outside the housing to prevent the leakage of shielding gas.

[0069] The wire harness of the electrical signal interface 316 of the welding torch head is electrically connected to the drive board of the galvanometer assembly 32. A wire harness terminal block is provided at the electrical signal interface 316, and a corresponding wire harness terminal block is provided on the laser output interface at the other end that is inserted into the welding torch head. The two are inserted and matched to connect the welding torch and the welding host. At the connection part of the welding section 30 and the gripping section 31, the channel in the welding section 30 penetrates the housing 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 mirror 322; the galvanometer motor 321 is fixed in the third cavity of the housing, the galvanometer mirror 322 is connected to the output shaft of the galvanometer motor 321, the galvanometer motor 321 controls the installation angle of the galvanometer mirror 322, and the entire galvanometer assembly is convenient for disassembly, installation, and maintenance.

[0070] Please refer to Figures 2 - 5 , in which, an implementation manner of the output interface is:

[0071] It includes an optical fiber seat 1 and an optical fiber output tube 2; an optical fiber hole 10, a first cooling hole 11, a second cooling hole 12, and a third cooling hole 13 are provided on the optical fiber seat 1. The head end in the axial direction of the optical fiber seat 1 is used to connect the welding torch, and the tail end is used to connect the host through a wire harness; the optical fiber hole 10 and the first cooling hole 11 penetrate the optical fiber seat 1 axially. The optical fiber output tube 2 is installed in the optical fiber hole 10, and both ends exceed the end face of the optical fiber seat 1; a first port 20 is provided at the part of the optical fiber output tube 2 located at the tail end of the optical fiber seat 1, and a second port 21 is provided at the part that cooperates with the optical fiber seat 1. The first port 20 and the second port 21 are communicated inside the optical fiber output tube 2; on the optical fiber seat 1, the second cooling hole 12 is a blind hole drilled from the head end to the tail end, and one end of the third cooling hole 13 is communicated with the second cooling hole 12, and the other end is communicated with the second port 21.

[0072] In the above implementation, instead of directly passing through the fiber optic base 1 and accessing the welding torch head, one of the cooling circuits enters the fiber optic output tube 2 from the first port 20 at the end of the fiber optic output tube 2. After circulating inside the fiber optic output tube 2, it returns to the mating part of the fiber optic output tube 2 and the fiber optic base 1, flows into the fiber optic base 1 from the second port 21, and then the fiber optic base 1 provides an outlet (such as Figure 4 the third cooling hole 13 and the second cooling hole 12 of Figure 4 ) for the welding torch to connect. The purpose is to dissipate heat from the fiber optic output tube 2. The fiber optic output tube 2 is the interface where the laser enters the air from the fiber optic bundle. The end of the fiber optic output tube 2 is connected to the fiber optic, and the fiber optic is connected to the welding host, which provides the laser source. The head end of the fiber optic output tube 2 directly shoots the laser from the fiber optic into the air. Inside the welding torch, there is a matching laser channel, and the aperture of the laser channel matches that of the fiber optic output tube 2 to ensure concentric mating during insertion, accurate laser beam path, and the ability to reflect the laser to the welding position. At the interface where the laser enters the air from the fiber optic bundle, that is, the head end of the fiber optic output tube 2, there is a special fiber optic crystal (or called laser crystal) to process the laser beam. The laser crystal can use commercially available products, which is not the core of this solution. Providing heat dissipation for it is the key point. However, there is energy loss during this conversion process, resulting in an increase in the temperature of the fiber optic crystal and the fiber optic output tube 2. By circulating the cooling medium into the fiber optic output tube 2, the temperature of the fiber optic output tube 2 can be effectively controlled, ensuring the reliability and stability of the output interface.

[0073] In the above embodiments of the laser welding torch head and the output interface, the interfaces between them integrate multiple interfaces that the laser welding torch may use, such as shielding gas, coolant, etc. These interfaces can be connected only by plugging them in. There is no need to set up additional pipelines externally for connection, nor is there a need for secondary connection operations other than plugging. This not only simplifies the connection process but also standardizes the interfaces. Between different models of welding torches and welding machines, through this unified standardized interface, fast matching use can be achieved.

[0074] The output interface integrates various functional interfaces required by the laser welding torch, such as shielding gas and coolant. Through a 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 and reducing the risk of human operation errors.

[0075] 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.

[0076] 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.

[0077] In one embodiment of the handheld laser welding device, the laser matching set of the welding gun head and the output interface includes:

[0078] A laser channel provided on one side of the welding gun head;

[0079] and, an optical fiber output tube 2 protruding from the end surface of the output interface;

[0080] 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.

[0081] 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.

[0082] In an embodiment of the hand-held laser welding device, the cooling cooperation group includes a first medium port 311 and a second medium port 312 provided on one side of the welding torch head, and a first cooling hole 11 and a second cooling hole 12 provided on one side of the optical fiber seat 1; the optical fiber hole 10 and the first cooling hole 11 penetrate through the optical fiber seat 1 along the axial direction, 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 seat 1; a first port 20 is provided at the tail end portion of the optical fiber output tube 2 located in the optical fiber seat 1, and a second port 21 is provided at the portion where the optical fiber output tube 2 cooperates with the optical fiber seat 1, and the first port 20 and the second port 21 are communicated inside the optical fiber output tube 2; on the optical fiber seat 1, the second cooling hole 12 is a blind hole drilled from the head end to the tail end, and a third cooling hole 13 is provided inside the optical fiber seat 1, one end of the third cooling hole 13 is communicated with the second cooling hole 12, and the other end is communicated with the second port 21; on the welding torch head, the first medium port 311 and the second medium port 312 are communicated to form a loop after entering the inside of the welding torch head body; when the welding torch head and the output interface are inserted into each other, the first medium port 311 and the second medium port 312 are docked with the first cooling hole 11 and the second cooling hole 12.

[0083] In the above embodiment, for the specific cooling medium flow path, reference can be made to Figure 4 and Figure 5 : The coolant enters the optical fiber output tube 2 from the first port 20, flows inside the optical fiber output tube 2, and then at the second port 21 where the optical fiber output tube 2 cooperates with the optical fiber seat 1, flows out of the optical fiber output tube 2 into the third cooling hole 13 on the optical fiber seat 1, and then flows out from the second cooling hole 12 on the optical fiber seat 1. The second cooling hole 12 is docked with the second medium port 312, and the coolant enters the inside of the welding torch head. Inside the welding torch head, the first medium port 311 and the second medium port 312 enter from the end of the grasping section 31 into the connecting portion of the welding section 30 and the grasping section 31, and then are connected into a loop by the first communication hole 313. Therefore, after the cooling medium entering the second medium port 312 circulates inside the welding torch head, it will flow out from the first medium port 311, 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 seat 1.

[0084] The coolant efficiently flows through the optical fiber output tube and the inside of the welding torch head, realizing multiple cooling of the laser crystal inside the optical fiber output tube, the housing of the laser channel outside the optical fiber output tube, and the welding torch head body, effectively reducing the working temperature, especially the working temperature of the interface part, improving the stability and service life of laser welding. The coolant circulates through the precisely designed flow channels to ensure uniform and sufficient cooling effect, while reducing the damage of thermal stress to the equipment structure. Finally, the coolant directly returns to the welding host through the reflux system, realizing the recycling of the coolant, saving energy and the environment, and improving the operation efficiency and reliability of the overall system.

[0085] Further, on the optical fiber base 1, an annular diameter-expanded section 101 is provided in the optical fiber hole 10, and one of the outlets of the third cooling hole 13 is located within the range of the annular diameter-expanded section 101, and the second port 21 on the optical fiber output tube 2 is also located within the range of the annular diameter-expanded section 101;

[0086] And / or, on the optical fiber output tube 2, an annular diameter-reduced section 22 is provided at the portion cooperating with the optical fiber base 1, one of the outlets of the third cooling hole 13 is located within the range of the annular diameter-reduced section 22, and the second port 21 on the optical fiber output tube 2 is also located within the range of the annular diameter-reduced section 22.

[0087] The second port 21 is provided on the circumference of the optical fiber output tube 2 and is the liquid outlet, and the third cooling hole 13 is provided in the area of the optical fiber base 1 cooperating with the optical fiber output tube 2 and is the liquid inlet. The annular diameter-reduced section 22 / annular diameter-expanded section 101 enables an annular communication area to be formed in the cooperating area between the optical fiber output tube 2 and the optical fiber base 1. When the cooling medium enters the annular diameter-reduced section 22 / annular diameter-expanded 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 torch 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, a first sealing ring 90 is provided at the cooperating interface between the optical fiber base 1 and the optical fiber output tube 2, which can prevent the cooling medium in the annular diameter-reduced section 22 / annular diameter-expanded section 101 from leaking axially.

[0088] On both sides of the connection between the third cooling hole 13 and the second port 21, they are approximately 180 degrees apart. The purpose is to facilitate the design of the flow channel inside the optical fiber output tube 2, make the flow path of the coolant inside the optical fiber output tube 2 longer, and fully cover the surface of the inner cooling core.

[0089] Further, 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. The output section converts the laser output by the optical fiber crystal 26 into collimated light, and spherical lenses, aspherical lenses, cylindrical lenses, etc. can be used. Reference can be made to the collimating mirrors in the prior art. The collimating mirror itself is not the core point of this solution; both the first port 20 and the second port 21 are provided in the cooling section. The first port 20 is located at the rear of the cooperation between the optical fiber base 1 and the optical fiber output tube 2, and the second port 21 is located at the cooperation position between the optical fiber base 1 and the optical fiber output tube 2.

[0090] Among them, for the cooling section, reference can be made to Figure 5 and Figure 6 , including:

[0091] An outer tube 23 whose outer circumference cooperates with the optical fiber base 1;

[0092] A cooling inner core 24 is disposed inside the outer tube 23 and has a gap with the outer tube 23. An optical fiber passes through the cooling inner core 24, and an optical fiber crystal 26 is disposed at the end of the cooling inner core 24 to emit laser light. The optical fiber crystal 26 and the cooling inner core 24 are integrated, so they can conduct heat to each other. To improve the heat dissipation efficiency, the cooling inner core 24 can be made of a material with high thermal conductivity, such as a metal, such as copper;

[0093] The two ends of the cooling inner core 24 and the outer tube 23 are hermetically fitted to prevent the leakage of the coolant. Both the first port 20 and the second port 21 are located in the part where the outer tube 23 has a gap with the cooling inner core 24. Therefore, after the coolant flows in from one port, it can flow out from the other port, absorbing the heat of the cooling inner core 24 during the process.

[0094] Further, on the cooling inner core 24, at the part having a gap with the outer tube 23, a meandering flow channel structure is provided. The medium enters the gap part 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 reverse direction. After meandering at least once, it flows out of the gap part from the second port 21.

[0095] The main principle of the above embodiment is as follows: Refer to 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 part between the cooling inner core 24 and the outer tube 23 from the first port 20, flows in the meandering flow channel structure in the gap part, and at the same time 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 reduced diameter section 22 / annular enlarged diameter section 101 where the optical fiber output tube 2 is fitted with the optical fiber seat 1. Therefore, the coolant can flow circumferentially here, then reaches the third cooling hole 13 on the optical fiber seat 1, and flows through the third cooling hole 13 to the second cooling hole 12, and then enters the welding torch at the docking end for circulation, and then flows out of the welding torch and enters the first cooling hole 11, passes through the optical fiber seat 1, and flows back to the welding host through the pipeline, thus forming a cooling cycle.

[0096] The cooling system designed in this embodiment significantly improves the thermal management efficiency and stability of the optical fiber interface through a clever flow channel layout and structure integration. Specifically, the coolant is precisely introduced from the first port, and the complex and efficient meandering flow channel between the cooling inner core and the outer tube is fully utilized to achieve immediate and comprehensive absorption of the heat generated by the optical fiber crystal, effectively reducing the working temperature and ensuring the performance and lifespan of the optical fiber components. In particular, when the coolant flows through the annular reduced diameter section / enlarged diameter section where the optical fiber output tube is fitted with the optical fiber seat, its circumferential flow characteristic makes the flow channel internalized, avoiding the external interface, simplifying the structure, and improving the stability.

[0097] 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 torch and completes the circulation. This process not only achieves the complete closed-loop circulation of the coolant, but also significantly simplifies the external connection of the cooling system, avoids external leakage of the pipeline and the leakage risk caused by complex pipelines, and improves the reliability and maintenance convenience of the overall system.

[0098] The cooling system of this embodiment realizes the high integration of the coolant structure and the full coverage of the cooling flow path. It not only accurately controls the temperature fluctuation of the interface during the welding process, ensures the high quality and consistency of fiber optic welding, but also greatly optimizes the complexity and operation efficiency of the system, bringing a more stable, efficient and economical fiber optic interface solution for the welding work.

[0099] Further, please refer to Figures 6 - 8 , the flow path structure includes a first sealing ring 241 and a second sealing ring 242 provided at both ends of the gap part; it also includes a guiding plate 243. The guiding plate 243 extends from the first sealing ring 241 towards the second sealing ring 242. Before contacting the second sealing ring 242, it changes to extend along the circumference, and this part is called the commutation section 2431. Then it extends in the opposite direction towards the first sealing ring 241 and stops extending before contacting the first sealing ring 241; the height of the guiding plate 243 matches the inner diameter of the outer tube 23. Where the inner diameter of the outer tube 23 is small, the height of the guiding plate 243 also decreases accordingly. The guiding plate 243 is provided with two groups at an interval of 180 degrees on the cooling inner core 24. The first port 20 communicates between the commutation section 2431 and the first sealing ring 241 on one of the guiding plates 243, and the second port 21 communicates between the commutation section 2431 and the first sealing ring 241 on the other guiding plate 243.

[0100] In the above embodiment, the flow path of the cooling medium is as follows: Refer to Figure 8 , Figure 8 To layout the flow path after unfolding the cylindrical cooling inner core 24 cooling flow path section in Figure 7 into a plane, it should be noted that in Figure 8 , the upper side line and the lower side line are the same side line, which is the unfolding line of the cylinder. Both ends of the gap part 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 dotted line in the figure towards the first sealing ring 241 side. After reaching the first sealing ring 241, it flows in the opposite direction along the dotted line towards the second sealing ring 242. After reaching the second sealing ring 242, it flows upwards or downwards in the figure (actually, when restoring the unfolded plane to a cylinder, the upper side and the lower side in the figure are the same side). Then it reverses again and flows towards the first sealing ring 241. After reaching the first sealing ring 241, it reverses again and enters Figure 8It flows into the dead end on the lower middle side of the guiding plate 243 and flows out from the second opening 21, which is located at the annular reduced diameter section 22 / annular enlarged diameter section 101 where the optical fiber output tube 2 cooperates with the optical fiber seat 1. Therefore, the coolant can flow circumferentially here, then reach the third cooling hole 13 on the optical fiber seat 1, flow through the third cooling hole 13 to the second cooling hole 12, then enter the welding torch at the docking end to circulate, flow out from the welding torch, enter the first cooling hole 11, pass through the optical fiber seat 1, and flow back to the welding mainframe through the pipeline, thus forming a cooling cycle.

[0101] The subtlety of the above flow channel design lies in that it ensures that the cooling medium can flow reciprocally in all directions and without dead angles along the surface of the cooling inner core. This characteristic greatly enhances the cooling effect and realizes high-efficiency and uniform thermal management of the laser crystal. This not only effectively avoids local overheating phenomena, ensures the best working state and long-term stability of the laser crystal, but also promotes the precise control of the interface temperature during the welding process, improves the welding quality and production efficiency. At the same time, the full-coverage cooling strategy also extends the service life of the equipment, reduces the maintenance cost, and brings significant economic benefits and competitive advantages to users.

[0102] Furthermore, on the cooling inner core 24, a raised strip 244 is also arranged along the axial direction. The height range of the raised strip 244 is less 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 flow direction of the flow channel. The raised strip fits well with the flow direction of the cooling medium. Not only does it serve as a natural guide to lead the medium to flow smoothly through the cooling system, reducing the flow resistance and loss, but also it significantly increases the contact area between the cooling medium and the cooling inner core through its unique shape. This design greatly promotes the heat transfer and exchange, enabling the heat transfer efficiency to make a qualitative leap, ensuring that the laser crystal can still maintain a stable low temperature state under extreme working conditions, and further enhancing the performance and reliability of the overall system, bringing more excellent performance and efficiency to the high-precision and high-power processing field.

[0103] In this embodiment, as Figure 11 shown, the protective gas cooperation group includes:

[0104] A protective gas interface 315 arranged on one side of the welding torch head;

[0105] and, a protective gas hole 14 arranged on the end face of the output interface. A sealing ring 91 is arranged at the end face of the optical fiber seat 1 where the protective gas hole 14 is located;

[0106] When the welding torch head and the output interface are inserted into each other, the protective gas interface 315 is docked with the protective gas hole 14;

[0107] On the welding torch head, the shielding gas interface 315 enters the welding torch head body. After exceeding the ranges of the protective mirror assembly and the focusing mirror assembly, it enters the laser channel through the second communication hole 314.

[0108] The shielding gas interface 315 enters the connection part of the welding section 30 and the gripping section 31 from the end of the gripping section 31, then enters the welding section 30. After exceeding the ranges of the galvanometer assembly 32 and the focusing mirror assembly 33, finally, it enters the laser channel through the second communication hole 314. Finally, together with the laser beam, it reaches the welding point from the nozzle hole of the welding torch head, covers the welding part, and plays a protective role. The second communication hole 314 penetrates from outside the housing to the inside of the housing, connects the shielding gas interface 315 and the laser channel at the center of the housing, and finally seals the second communication hole 314 outside the housing to prevent the leakage of the shielding gas.

[0109] Please refer to Figure 1 and Figure 2 , in combination with Figure 11 and Figure 12 , the electrical signal cooperation group includes:

[0110] An electrical signal interface 316 provided on one side of the welding torch head;

[0111] And, a contact seat 151 provided on the end face of the output interface;

[0112] When the welding torch head and the output interface are inserted into each other, the electrical signal interface 316 is electrically connected to the contact seat 151, and a hole position 15 for installing the contact seat 151 can be set on the fiber optic seat;

[0113] A drive circuit board of a galvanometer motor assembly is provided on the welding torch head, and the line of the electrical signal interface 316 is connected to the drive circuit board. The drive circuit board can be arranged on the housing where the galvanometer assembly is installed, and one side of the drive circuit board has a relatively short distance from the galvanometer motor. The drive circuit board can be installed outside the third cavity, and the galvanometer motor is installed from the third cavity. The galvanometer assembly is a special optical device. More specifically, it is a reflecting lens controlled by a special swinging motor. Different from ordinary rotary motors, the rotor of the galvanometer cannot achieve a 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 an electrical signal acts on the galvanometer motor through the drive circuit board, it will drive 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 for 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 meet complex and variable welding requirements. In the prior art, the drive circuit board of the galvanometer motor is generally arranged in the welding host, connected to the output interface through a wire harness from the welding host, and then connected to the galvanometer motor through the docking of the output interface. The analog signal for controlling the action of the galvanometer motor between the galvanometer motor and the drive circuit board in the welding host is easily interfered with after a long-distance transmission, resulting in a decrease in the accuracy of the galvanometer motor's response to the control signal.

[0114] In this embodiment, the drive circuit board for controlling the action of the galvanometer motor is arranged on the welding torch head. The distance between the drive circuit board and the galvanometer motor is short, and the analog signal is not easily interfered with. Between the drive circuit board and the welding host, communication can be carried out through digital signals. For example, the Modbus bus, Profibus bus or CAN bus can be used in combination with the corresponding communication protocol for communication, which can ensure the accuracy and integrity of the control signal, enable the galvanometer motor to accurately respond to the control signal, and improve the welding quality.

[0115] In summary, the present invention effectively overcomes various disadvantages in the prior art, can produce beneficial technical effects, and has remarkable progress.

[0116] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should 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 inserted and matched with 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 wire harness; The insertion interface between the welding gun head and the output interface includes: a laser matching group, a cooling matching group, a shielding gas matching group, and an electrical signal matching group; The output interface includes an optical fiber seat (1) and an optical fiber output tube (2). An optical fiber hole (10) is provided on the optical fiber seat (1). The optical fiber hole (10) axially penetrates the optical fiber seat (1). 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 seat (1); The optical fiber output tube (2) has a first port (20) at the tail end part of the optical fiber seat (1) and a second port (21) at the part that cooperates with the optical fiber seat (1). The first port (20) and the second port (21) communicate with each other inside the optical fiber output tube (2); The optical fiber output tube (2) includes a tail section, a cooling section, and an output section that are connected in sequence; both the first port (20) and the second port (21) are provided in the cooling section; The cooling section includes: an outer tube (23) whose outer circumference cooperates with the optical fiber seat (1); a cooling inner core (24) arranged inside the outer tube (23) and having a gap with the outer tube (23). The optical fiber passes through the cooling inner core (24), and an optical fiber crystal (26) is arranged at the end of the cooling inner core (24) to emit laser; both ends of the cooling inner core (24) and the outer tube (23) are hermetically matched. Both the first port (20) and the second port (21) are located at the part where the outer tube (23) and the cooling inner core (24) have a gap; on the cooling inner core (24), at the part having a gap with the outer tube (23), a tortuous flow channel structure is provided. The medium enters the gap part 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 reverse direction. After such a tortuous flow at least once, it flows out of the gap part from the second port (21); The flow channel structure includes a first blocking ring (241) and a second blocking ring (242) provided at both ends of the gap part; It further includes a guiding plate (243). The guiding plate (243) extends from the first blocking ring (241) towards the second blocking ring (242). Before contacting the second blocking ring (242), it changes to extend along the circumference. This part is called the commutation section (2431), and then it extends in the reverse direction towards the first blocking ring (241) and stops extending before contacting the first blocking ring (241); the height of the guiding plate (243) matches the inner diameter of the outer tube (23). Two groups of guiding plates (243) are provided on the cooling inner core (24) at an interval of 180 degrees. The first port (20) communicates between the commutation section (2431) and the first blocking ring (241) on one of the guiding plates (243), and the second port (21) communicates between the commutation section (2431) and the first blocking ring (241) on the other guiding plate (243).

2. A handheld laser welding device according to claim 1, characterized in that: The laser matching group includes: A laser channel provided on one side of the welding gun head; And, the optical fiber output tube (2) provided on the output interface; When the welding torch head and the output interface are inserted into each other, the optical fiber output tube (2) cooperates with the laser channel.

3. A handheld laser welding device according to claim 2, wherein: The cooling cooperation group includes a first medium port (311) and a second medium port (312) provided on one side of the welding torch head, and a first cooling hole (11) and a second cooling hole (12) provided on one side of the optical fiber seat (1); The first cooling hole (11) axially penetrates the optical fiber seat (1); On the optical fiber seat (1), the second cooling hole (12) is a blind hole drilled from the head end to the tail end, and a third cooling hole (13) is provided inside the optical fiber seat (1). One end of the third cooling hole (13) communicates with the second cooling hole (12), and the other end communicates with the second port (21); On the welding torch head, after the first medium port (311) and the second medium port (312) are connected into the welding torch head body, they communicate to form a loop; When the welding torch head and the output interface are inserted into each other, the first medium port (311) and the second medium port (312) are docked with the first cooling hole (11) and the second cooling hole (12).

4. A handheld laser welding device according to claim 3, wherein: On the optical fiber seat (1), an annular diameter-expanded section (101) is provided in the optical fiber hole (10). One outlet of the third cooling hole (13) is located within the range of the annular diameter-expanded section (101), and the second port (21) on the optical fiber output tube (2) is also located within the range of the annular diameter-expanded section (101); And / or, on the optical fiber output tube (2), an annular diameter-reduced section (22) is provided at the part that cooperates with the optical fiber seat (1). One outlet of the third cooling hole (13) is located within the range of the annular diameter-reduced section (22), and the second port (21) on the optical fiber output tube (2) is also located within the range of the annular diameter-reduced section (22).

5. A handheld laser welding device according to claim 4, characterized in that, 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.

6. A handheld laser welding device according to claim 1, characterized in that, The shielding gas cooperation group includes: A shielding gas interface (315) provided on one side of the welding torch head; And a shielding gas hole (14) provided on the end face of the output interface; When the welding torch head and the output interface are inserted into each other, the shielding gas interface (315) is docked with the shielding gas hole (14); On the welding torch head, after the shielding gas interface (315) enters the welding torch head body and exceeds the ranges of the protective mirror assembly and the focusing mirror assembly, it is introduced into the laser channel through the second communication hole (314).

7. A handheld laser welding device according to claim 1, characterized in that, The electrical signal cooperation group includes: An electrical signal interface (316) provided on one side of the welding torch head; And a contact seat (151) provided on the end face of the output interface; When the welding torch head and the output interface are inserted into each other, the electrical signal interface (316) is electrically connected to the contact seat (151); A drive circuit board of the galvanometer motor assembly is provided on the welding torch head, and the circuit of the electrical signal interface (316) is connected to the drive circuit board.

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