Hand-held laser welding device capable of preventing twisting of welding wire

Abstract

The invention provides a handheld laser welding device capable of preventing twisting of a welding wire, belongs to the technical field of laser welding, and is used for solving the problem that a wire feeding pipe of a handheld laser welding gun in the prior art is easy to twist due to movement of the welding gun, so that wire feeding is not smooth. The invention provides a handheld laser welding device capable of preventing a welding wire from twisting. The handheld laser welding device comprises a welding gun and a welding wire twisting preventing device detachably connected to the welding gun. The welding wire anti-twisting device comprises a first wire nozzle, a second wire nozzle and a quick release structure, wire holes are formed in the first wire nozzle and the second wire nozzle, the tail end of the first wire nozzle is rotationally matched with the head end of the second wire nozzle, and the quick release structure is arranged on the outer layer of the matching position of the first wire nozzle and the second wire nozzle and limits axial unexpected sliding of the first wire nozzle and the second wire nozzle. By optimizing the structural design of the welding wire anti-twisting device on the handheld laser welding gun, the problem that the wire feeding pipe is twisted due to dragging in the welding process is effectively solved, and smooth wire feeding is ensured.

Description

Technical Field

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

[0002] In the prior art, the connection between a handheld laser welding gun and a wire feeder depends on a wire feeding tube to achieve continuous wire feeding during the welding process. However, due to the complexity of the welding operation environment and the high flexibility of the welding gun operation, frequent changes in the position and angle of the welding gun can easily cause physical torsion and deformation of the wire feeding tube. This deformation may change the internal cross-section of the wire feeding tube, resulting in direct friction between the inner wall of the wire feeding tube and the welding wire, significantly increasing the wire feeding resistance, affecting the continuity and stability of wire feeding, and even causing wire feeding interruption, seriously reducing the efficiency and quality of the welding operation.

[0003] Therefore, developing a handheld laser welding gun that can effectively prevent the wire feeding tube from twisting and ensure smooth wire feeding has become an urgent technical problem to be solved currently. Summary of the Invention

[0004] 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 for preventing wire twisting of the welding wire, which is used to solve the problem that the wire feeding tube of the handheld laser welding gun in the prior art is prone to twisting due to the movement of the welding gun, resulting in unsmooth wire feeding.

[0005] To achieve the above purpose and other related purposes, the present invention provides a handheld laser welding device for preventing wire twisting of the welding wire, including: A welding gun and a wire twisting prevention device detachably connected to the welding gun, and the axes of the wire twisting prevention device and the welding gun barrel intersect at the welding point of the nozzle; The welding gun 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 for connecting to the host through a wire harness; The wire twisting prevention device includes: a first wire nozzle, a second wire nozzle, and a quick-release structure. Wire holes are provided in both the first wire nozzle and the second wire nozzle. The tail end of the first wire nozzle is rotationally matched with the head end of the second wire nozzle, and the quick-release structure is arranged on the outer layer of the joint of the first wire nozzle and the second wire nozzle and restricts the unexpected axial sliding of the first wire nozzle and the second wire nozzle.

[0006] Optionally, the inner circular surface of the tail end of the first wire nozzle is rotationally matched with the outer circular surface of the head end of the second wire nozzle; The quick-release structure includes an elastic member, a sliding ring, and a locking body; The elastic member is annular and sleeved on the outer circular surface of the tail end of the first wire nozzle; The sliding ring is sleeved outside the elastic member and is in sliding fit with the first nozzle. Both ends of the elastic member are respectively abutted against the stepped surfaces of the first nozzle and the sliding ring. At the mating portion of the second nozzle and the first nozzle, a locking hole is provided in the radial direction. The locking hole penetrates through the first nozzle and forms a blind hole in the second nozzle. The locking body is movably arranged in the locking hole. The locking hole penetrates into the second nozzle but does not penetrate through the second nozzle. A rotary groove is provided at the corresponding position on the axis of the second nozzle. The rotary groove corresponds to the position of the locking hole. The locking body can roll in the rotary groove. A step is provided on the inner circle of the sliding ring. Initially, the elastic member causes the step to match the position of the locking body and causes the locking body to be embedded in both the first nozzle and the second nozzle at the same time. After the sliding ring moves against the elastic force, the step and the locking body are displaced in position, and the locking body disengages from the locking hole of the second nozzle.

[0007] Optionally, the locking body is a spherical ball, and at least two groups of the locking holes are axially distributed. On the second nozzle, a limit disk for restricting the sliding range of the sliding ring is provided. An annular snap ring is provided at the end of the second nozzle. The snap ring protrudes from the outer circular surface of the second nozzle. The snap ring abuts against the step on the inner circle of the sliding ring to limit the sliding range on this side.

[0008] Optionally, the mating interface of the welding torch head and the output interface includes: a laser mating group, a cooling mating group, a shielding gas mating group, and an electrical signal mating group.

[0009] Optionally, the laser mating group includes: A laser channel provided on one side of the welding torch head; And, an optical fiber output tube protruding from the end face of the output interface; When the welding torch head and the output interface are inserted into each other, the optical fiber output tube is mated with the laser channel.

[0010] Optionally, it is characterized in that: The output interface includes an optical fiber seat and an optical fiber output tube. An optical fiber hole is provided on the optical fiber seat; The cooling mating 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; The optical fiber hole and the first cooling hole axially penetrate through the optical fiber seat. The optical fiber output tube is installed in the optical fiber hole and both ends thereof extend beyond the end faces of the optical fiber seat. 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 cooperating with the fiber optic seat. The first port and the second port are communicated inside the fiber optic output tube; On the fiber optic seat, the second cooling hole is a blind hole drilled from the head end to the tail end. A third cooling hole is provided inside the fiber optic seat. One end of the third cooling hole is communicated with the second cooling hole, and the other end is communicated with the second port; On the welding torch head, the first medium port and the second medium port 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 and the second medium port are docked with the first cooling hole and the second cooling hole.

[0011] Optionally, on the fiber optic seat, an annular diameter expansion section is provided inside the fiber optic hole. One of the outlets of the third cooling hole is located within the range of the annular diameter expansion section, and the second port on the fiber optic output tube is also located within the range of the annular diameter expansion section; And / or, on the fiber optic output tube, an annular diameter reduction section is provided at the portion cooperating with the fiber optic seat. One of the outlets of the third cooling hole is located within the range of the annular diameter reduction section, and the second port on the fiber optic output tube is also located within the range of the annular diameter reduction section.

[0012] 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 optic crystal. The output section converts the laser output by the fiber optic crystal into collimated light; Both the first port and the second port are provided on the cooling section.

[0013] Optionally, the cooling section includes: An outer tube whose outer periphery cooperates with the fiber optic seat; A cooling inner core provided inside the outer tube and having a gap with the outer tube. The fiber optic passes through the cooling inner core, and the fiber optic crystal is provided at the end of the cooling inner core and emits laser light; Both ends of the cooling inner core and the outer tube are hermetically fitted. 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; On the cooling inner core, at the portion having a gap with the outer tube, a tortuous flow channel structure is provided. The medium enters the gap portion from the first port, flows along the axis of the cooling inner core to the other end, and then flows back in the reverse direction. After such tortuous flow at least once, it flows out of the gap portion from the second port.

[0014] Optionally, the flow channel structure includes a first sealing ring and a second sealing ring provided at both ends of the gap portion; It further includes a guiding plate which 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. The height of the guiding plate matches the inner diameter of the outer tube. There are two groups of the guiding plates arranged at an interval of 180 degrees on the cooling inner core. 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.

[0015] As described above, the wire anti-twist handheld laser welding device of the present invention has at least the following beneficial effects: By optimizing the structural design of the wire anti-twist device on the handheld laser welding gun, the problem that the wire feeding tube twists due to dragging during the welding process is effectively avoided, ensuring the stable shape and inner diameter of the wire feeding tube. Thus, the wire feeding resistance is significantly reduced, and the continuity and stability of wire feeding are improved. It can not only improve the efficiency of welding operations, but also significantly improve the welding quality, reduce welding defects caused by poor wire feeding, and bring significant performance improvement to the handheld laser welding technology. Description of the Drawings

[0016] Figure 1 It shows the overall schematic diagram of the handheld laser welding device of the present invention.

[0017] Figure 2 It shows the overall schematic diagram of the handheld laser welding device of the present invention.

[0018] Figure 3 It shows the overall sectional view of the wire anti-twist device of the present invention.

[0019] Figure 4 It shows the sectional view of the shell of the wire anti-twist device of the present invention.

[0020] Figure 5 It shows the schematic diagram of the laser welding gun head of the present invention.

[0021] Figure 6 It shows the schematic diagram of the laser output interface of the present invention.

[0022] Figure 7 It shows the disassembled schematic diagram of the laser output interface of the present invention.

[0023] Figure 8 It shows the sectional view of the laser output interface of the present invention.

[0024] Figure 9 It shows the sectional view of the optical fiber output tube of the present invention.

[0025] Figure 10 It shows a schematic diagram of the disconnection and dissection of the optical fiber output tube of the present invention.

[0026] Figure 11 It shows a schematic diagram of the cooling inner core of the present invention.

[0027] Figure 12 It shows a schematic diagram of the unfolded upper flow channel of the cooling inner core of the present invention.

[0028] Figure 13 It shows a schematic diagram of the protective gas interface of the laser welding gun head of the present invention.

[0029] Figure 14 It shows a schematic diagram of the cooling holes of the laser welding gun head of the present invention.

[0030] Figure 15 It shows a schematic diagram of the rotary groove on the second wire nozzle of the present invention.

[0031] Wherein: the first wire nozzle 40, the wire hole 401, the limit disk 402, the snap ring 403, the second wire nozzle 41, the rotary groove 4110, the quick-release structure 42, the elastic member 421, the sliding ring 422, the step 4221, the locking body 423, the locking hole 424, the welding wire 92, the optical fiber seat 1, the optical fiber hole 10, the annular diameter-expanding section 101, the first cooling hole 11, the second cooling hole 12, the third cooling hole 13, the protective gas hole 14, the contact seat 151, the optical fiber output tube 2, the first port 20, the second port 21, the annular diameter-reducing section 22, the outer tube 23, the cooling inner core 24, the first sealing ring 241, the second sealing ring 242, the guiding plate 243, the commutation section 2431, the optical fiber crystal 26, the gun barrel 302, the first medium port 311, the second medium port 312, the second communication hole 314, the protective gas interface 315, the electrical signal interface 316, the galvanometer assembly 32, the focusing lens assembly 33. Specific embodiments

[0032] 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.

[0033] Please refer to Figures 1 to 15It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the implementation conditions 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 of 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 in which the present invention can be implemented.

[0034] The following various embodiments are only for illustration. Combinations can be made between the various embodiments, and it is not limited to the content shown in the following single embodiment.

[0035] Please refer to this embodiment Figures 1 - 2 , an embodiment of the hand-held laser welding device for preventing the twisting of welding wire provided by the present invention, includes: a welding torch and a welding wire anti-twisting device detachably connected to the welding torch. The axis of the welding wire anti-twisting device and the barrel 302 of the welding torch intersect at the welding place of the nozzle. The barrel 302 of the welding torch is fixed to the welding torch body through a buckle 303; the welding torch includes 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. There is a plug-and-play structure that matches between the welding torch head and the output interface; the wire outlet end of the welding wire anti-twisting device matches the welding torch nozzle, and the tail end is connected to the wire feeder through a wire feeding tube.

[0036] A galvanometer assembly 32, a focusing lens assembly 33, and a protective lens assembly 34 are arranged on the body of the laser welding torch head. The galvanometer assembly 32 is arranged at the connection between the welding section 30 and the grasping section 31 of the welding torch head body, and reflects the laser beam that enters from the output interface in the laser channel inside 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. 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 nozzle 301. The laser energy melts the surface of the workpiece or the externally added welding wire, thereby realizing welding.

[0037] The galvanometer assembly 32 includes a galvanometer motor 321 and a galvanometer mirror 322. The galvanometer mirror 322 is a reflective 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 grasping section 31, so that the laser beam propagates along the laser channel inside the welding torch head.

[0038] 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. There is a through hole 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.

[0039] The protective lens assembly 34 includes a second drawer box 341 and a protective lens 342. There is a through hole 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.

[0040] The wire anti-twist device is as Figure 2 shown, and includes: a first nozzle 40, a second nozzle 41, and a quick-release structure 42. Wire holes 401 are provided inside both the first nozzle 40 and the second nozzle 41. The tail end of the first nozzle 40 is rotationally matched with the head end of the second nozzle 41. The quick-release structure 42 is arranged on the outer layer at the mating part of the first nozzle 40 and the second nozzle 41 and restricts the unexpected axial sliding of the first nozzle 40 and the second nozzle 41.

[0041] During the welding operation process, the welding torch needs to be used at different positions, and the welding torch will also drag the wire feeding tube when moving. In the prior art, both ends of the wire feeding tube are fixedly connected to the welding torch or the wire feeder. During the process of the welding torch dragging the wire feeding tube to move, the wire feeding tube may be torsionally deformed, and then the cross-section of the wire feeding tube is deformed. This phenomenon significantly increases the frictional resistance of the welding wire 92 in the pipeline, causing problems such as poor wire feeding, uneven speed, and even blockage and jamming, seriously affecting the continuity of the welding operation and the weld quality. Therefore, during the operation process, the welding personnel need to always pay attention to the wire feeding tube, straighten the wire feeding tube, and avoid the wire feeding tube from twisting.

[0042] In the above embodiment, the first nozzle 40 and the second nozzle 41 can rotate relative to each other. The wire anti-twist device is installed at the wire outlet of the welding torch (refer to Figure 1), which is connected to a wire feeder through a wire feeding tube. The first nozzle 40 and the second nozzle 41 of the wire anti-twist device can rotate relative to each other. When the external wire feeding tube twists during dragging, the twisting force is transmitted along the wire feeding tube to the connection between the second nozzle 41 and the first nozzle 40, and the relative rotation of the second nozzle 41 consumes the twisting force, thus preventing the wire feeding tube from twisting.

[0043] In the above embodiment, the first nozzle 40 and the second nozzle 41 can be disengaged; the welding torch head and the output interface connecting the welding machine main body can also be disconnected from each other. The flexible disconnection and connection between the wire feeding tube and the welding torch, and between the main body and the welding torch are realized, greatly improving the convenience of equipment maintenance and reducing the downtime; secondly, it is convenient to quickly replace the wire feeder model and laser welding machine main body model connected to the welding torch according to actual needs, so as to replace different specifications of welding wires and laser sources, enhancing the flexibility and compatibility of the operation; furthermore, when the welding torch is damaged, the wire feeder can be easily connected to a spare welding torch to ensure continuous production without interruption, reducing the economic losses caused by equipment failures.

[0044] Furthermore, as Figure 2 and Figure 3 shown, the inner circular surface at the tail end of the first nozzle 40 is rotationally mated with the outer circular surface at the head end of the second nozzle 41; The quick-release structure 42 includes an elastic member 421, a sliding ring 422 and a locking body 423; The elastic member 421 is annular and sleeved on the outer circular surface at the tail end of the first nozzle 40; The sliding ring 422 is slidably sleeved outside the elastic member 421 and is slidably mated with the first nozzle 40. The two ends of the elastic member 421 are respectively abutted against the stepped surfaces of the first nozzle 40 and the sliding ring 422; At the mating part of the second nozzle 41 and the first nozzle 40, a locking hole 424 is provided along the radial direction. The locking hole 424 penetrates through the first nozzle 40 and forms a blind hole on the second nozzle 41. The locking body 423 is movably arranged in the locking hole 424. Forming a blind hole means that the locking hole penetrates into the second nozzle 41 but does not penetrate through the second nozzle 41. A rotary groove 4110 is provided at the corresponding position on the axis of the second nozzle 41. The rotary groove 4110 corresponds to the position of the locking hole. The area where the locking hole penetrates into the second nozzle 41 is located in the rotary groove 4110. The locking body 423 can roll in the rotary groove or move along the axis of the locking hole 424. A step 4221 is provided on the inner circle of the sliding ring 422. When the step 4221 is located outside the area of the locking hole 424, the movement of the locking body 423 along the axis of the locking hole 424 is restricted; Initially, the elastic member 421 causes the step 4221 to match the position of the locking body 423, and causes the locking body 423 to be embedded in both the first nozzle 40 and the second nozzle 41 at the same time. The two cannot move axially relative to each other, but can rotate relative to each other; After the sliding ring 422 moves against the elastic force, the step 4221 and the locking body 423 are out of alignment, and the locking body 423 disengages from the locking hole 424 of the second nozzle 41. The first nozzle 40 and the second nozzle 41 can move axially relative to each other and thus separate. Chamfers can be provided on both sides of the rotary groove 4110, so that when the second nozzle 41 is pulled out from the first nozzle 40, the extrusion force of the rotary groove 4110 on the locking body 423 can more easily push the locking body 423 out of the rotary groove 4110.

[0045] Furthermore, the locking body 423 is a spherical ball, and at least two groups of locking holes 424 are axially distributed. In a preferred solution, 4 or 5 groups are evenly distributed circumferentially to improve the locking performance of the locking body 423 in the locking hole 424 against the relative sliding tendency of the first nozzle 40 and the second nozzle 41 and the reliability of the locking structure itself. The cross-section of the spherical ball matches the cross-section of the blind hole formed on the second nozzle 41. Since the locking hole 424 is spherical, when the sliding ring 422 is pushed by hand to make the step 4221 and the locking body 423 out of alignment and the second nozzle 41 is pulled out at the same time, under the action of the lateral force, the locking hole 424 can more easily disengage from the blind hole on the second nozzle 41, so the second nozzle 41 can be pulled out more easily, realizing the disassembly of the wire feeding tube. On the second nozzle 41, a limit disk 402 for restricting the sliding range of the sliding ring 422 is provided. The limit disk 402, the snap ring 403 and the step 4221 respectively limit the maximum sliding range of the sliding ring 422 in two directions, ensuring the stable assembly relationship and normal function among the components. An annular snap ring 403 is provided at the end of the second nozzle 41. The snap ring 403 protrudes from the outer circular surface of the second nozzle 41, and the snap ring 403 abuts against the step 4221 on the inner circle of the sliding ring 422, restricting the sliding range on this side.

[0046] In the above embodiment, the quick-release structure 42 is provided on the outer layer at the mating part of the first nozzle 40 and the second nozzle 41 and restricts the unexpected relative axial sliding of the first nozzle 40 and the second nozzle 41, so that they can only rotate when in the connected state, so that the first nozzle 40 and the second nozzle 41 can rotate relative to each other without unexpected disengagement. However, when the quick-release structure 42 is unlocked, the second nozzle 41 can be disengaged from the first nozzle 40, thereby removing the wire feeding tube as a whole. For example, removing the wire feeding tube from the welding torch, thereby improving the convenience of using the wire feeding tube and the end welding torch and the convenience of maintenance.

[0047] For this embodiment, please refer to Figures 5 - 6 , the output interface at the tail end of the laser welding torch includes an optical fiber seat 1 and an optical fiber output tube 2, and an optical fiber hole 10 is provided on the optical fiber seat 1. The mating interface between the welding torch head and the output interface includes: a laser mating group, a cooling mating group, a shielding gas mating group and an electrical signal mating group.

[0048] By integrating multiple key functional components such as the laser coordination group, cooling coordination group, shielding gas coordination group and electrical signal coordination group into the end face of the welding gun 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 labor-intensive, but also prone to errors. In traditional welding systems, there are also designs that integrate the welding gun head and the output interface. Although this increases the reliability of the interface, it sacrifices convenience.

[0049] In this embodiment, all interfaces can be connected by plugging in 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 of welding equipment, making it more flexible and convenient for users to replace or upgrade equipment, and reducing maintenance costs.

[0050] Among them, the laser matching group includes: a laser channel arranged on one side of the welding gun head; and an optical fiber output tube 2 protruding from the end face of the output interface; when the welding gun head and the output interface are plugged in, the optical fiber output tube 2 matches 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 emitted into the laser channel and is reflected by the galvanometer assembly on the welding gun head and focused by the focusing mirror assembly before being emitted 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 between the two can ensure that the laser beam is located in the center of the laser channel, make the laser propagation direction accurate, increase the accuracy of docking of the matching parts, and improve the safety of the use of the welding gun; 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 exceed 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 2 1 is 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 with the second cooling hole 12, and the other end is connected with 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 connected 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 butt-jointed with the first cooling hole 11 and the second cooling hole 12.

[0051] In the above embodiments, in combination with Figure 8 and Figure 9 , the specific cooling medium flow path is as follows: The coolant enters the optical fiber output tube 2 from the first port 20. After flowing and exchanging heat inside the optical fiber output tube 2, at the second port 21 at the mating part of the optical fiber output tube 2 and the optical fiber base 1, it flows from the optical fiber output tube 2 into the third cooling hole 13 on the optical fiber base 1, and then flows out from the second cooling hole 12 on the optical fiber base 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 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. 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 mainframe after passing through the optical fiber base 1.

[0052] The coolant flows efficiently 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, and 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 mainframe 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.

[0053] Among them, 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, and a sealing ring 91 is provided on the docking end face. On the welding torch head, after the shielding gas interface 315 enters the welding torch head body and exceeds the range of the protective mirror assembly and the focusing mirror assembly 33, it enters the laser channel through the second communication hole 314. For reference, see Figure 13 .

[0054] The shielding gas interface 315 enters the connecting part of the welding section and the gripping section from the end of the gripping section, then enters the welding section. After exceeding the range of the protective mirror assembly and the focusing mirror assembly, finally it enters the laser channel through the second communication hole 314. Finally, it follows the laser beam and reaches the welding point from the nozzle hole of the welding torch head, covering the welding part to play a protective role. The second communication hole 314 penetrates from outside the housing to the inside of the housing, connecting the shielding gas interface 315 and the laser channel at the center of the housing, and finally blocking the second communication hole 314 outside the housing to prevent shielding gas leakage.

[0055] Among them, 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 driving circuit board of the calming motor assembly is provided on the welding torch head, and the circuit of the electrical signal interface 316 is connected to the driving circuit board.

[0056] A driving 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 driving circuit board. The driving circuit board can be provided on the housing for mounting the galvanometer assembly, and one side of the driving circuit board is at a relatively close distance from the galvanometer motor. In the prior art, the driving circuit board of the galvanometer motor is generally provided 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 and the welding torch head. The control signal for the action of the galvanometer motor between the galvanometer motor and the driving circuit board in the welding host is an analog signal. After a long-distance transmission, the signal is extremely easy to be interfered, resulting in a decrease in the accuracy of the galvanometer motor's response to the control signal.

[0057] In this embodiment, the driving circuit board for controlling the action of the galvanometer motor is provided on the welding torch head. The distance between the driving circuit board and the galvanometer motor is close, and the analog signal is not easily interfered. Between the driving 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 cooperation 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.

[0058] As a further solution of the cooling cooperation group, please refer to Figure 7 in this embodiment. On the optical fiber seat 1, an annular diameter-expanding section 101 is provided in the optical fiber hole 10, and one of the outlets of the third cooling hole 13 is within the range of the annular diameter-expanding section 101, and the second port 21 on the optical fiber output tube 2 is also within the range of the annular diameter-expanding section 101; and / or, on the optical fiber output tube 2, an annular diameter-reducing section 22 is provided at the part cooperating with the optical fiber seat 1, and one of the outlets of the third cooling hole 13 is within the range of the annular diameter-reducing section 22, and the second port 21 on the optical fiber output tube 2 is also within the range of the annular diameter-reducing section 22.

[0059] The second port 21 is arranged on the circumference of the optical fiber output tube 2 and is the liquid outlet. The third cooling hole 13 is arranged on the optical fiber seat 1 in the area that cooperates with the optical fiber output tube 2. The annular reduced-diameter section 22 / annular enlarged-diameter section 101 enables the cooperation area between the optical fiber output tube 2 and the optical fiber seat 1 to form an annular communication area, making the second port 21 communicate with the third cooling hole 13 and the second cooling hole 12. When the cooling medium enters the annular reduced-diameter section 22 / annular enlarged-diameter section 101 from the second port 21, it can reach one side of the third cooling hole 13, flow out from the second cooling hole 12 after passing through the third cooling hole 13, and then flow into one end of the welding torch docked with the output interface. On both sides of the annular area where the third cooling hole 13 communicates with the second port 21, a first sealing ring 90 is arranged at the cooperation interface between the optical fiber seat 1 and the optical fiber output tube 2, which can prevent the cooling medium in the annular reduced-diameter section 22 / annular enlarged-diameter section 101 from leaking axially.

[0060] 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, making the flow path of the cooling liquid longer inside the optical fiber output tube 2 and fully covering the surface of the inner cooling core.

[0061] For this embodiment, please refer to Figures 5 - 10 , 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. The optical fiber crystal can use off-the-shelf products on the market, which is not the focus of this solution. The focus of this solution is to cool it; both the first port 20 and the second port 21 are arranged in the cooling section. The first port 20 is located at the rear of the cooperation between the optical fiber seat 1 and the optical fiber output tube 2, and the second port 21 is located at the cooperation part between the optical fiber seat 1 and the optical fiber output tube 2.

[0062] Among them, 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 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. To improve the heat dissipation efficiency, the cooling inner core 24 can be made of a material with high thermal conductivity, such as metal, like copper; The two ends of the cooling inner core 24 and the outer tube 23 are sealed and matched. Both the first port 20 and the second port 21 are located in the part where the outer tube 23 and the cooling inner core 24 have a gap. Therefore, after the cooling liquid flows in from one of the ports, it can flow out from the other port, absorbing the heat of the cooling inner core 24 during the process On the cooling inner core 24, at the part with a gap from 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.

[0063] The main principle of the above embodiment is as follows: Refer to Figure 8 , Figure 9 , 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, and flows in the meandering flow channel structure in the gap part, while absorbing 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 cooperates 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 flow channel of the third cooling hole 13 to the second cooling hole 12, and then enters the welding torch at the docking end to circulate, 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.

[0064] The cooling system designed in this embodiment significantly improves the thermal management efficiency and stability of the optical fiber interface through ingenious flow channel layout and structural integration. Specifically, the coolant is accurately 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 instant 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 cooperates with the optical fiber seat, its circumferential flow characteristics make the flow channel internal, avoiding external interfaces, simplifying the structure, and improving stability.

[0065] In addition, through the elaborate layout and seamless connection from the third cooling hole, the second cooling hole to the first cooling hole, the coolant smoothly enters the welding torch and completes the cycle. This process not only realizes the completely closed-loop circulation flow 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.

[0066] The cooling system of this embodiment not only accurately controls the temperature fluctuation of the interface during the welding process, ensures the high quality and consistency of optical fiber welding, but also greatly optimizes the complexity and operation efficiency of the system by realizing the high integration of the coolant structure and the full coverage of the cooling flow channel, bringing a more stable, efficient and economical optical fiber interface solution for the welding work.

[0067] For this embodiment, please refer to Figures 9 - 11, the flow channel structure includes a first sealing ring 241 and a second sealing ring 242 provided at both ends of the gap portion; It further 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. This part is called the commutation section 2431, and then it extends reversely 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. Two groups of guiding plates 243 are arranged 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 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.

[0068] In the above embodiment, the flow path of the cooling medium is as follows: Refer to Figure 12 , Figure 12 For the flow channel layout after unfolding the cooling channel section of the cylindrical cooling inner core 24 in Figure 11 into a plane, it should be noted that in Figure 12 , the upper side line and the lower side line are the same side line, which is the unfolding line of the cylinder. The gap portion between the cooling inner core 24 and the outer tube 23 is respectively isolated by the first sealing ring 241 and the second sealing ring 242 at both ends. The cooling liquid enters from the first port 20 and flows along the Figure 12 dotted line in towards the first sealing ring 241 side. After reaching the first sealing ring 241, it flows reversely 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 the unfolded plane is restored to a cylinder, the upper side and the lower side in the figure are the same side). Subsequently, it reverses again and flows towards the first sealing ring 241. After reaching the first sealing ring 241, it reverses again and enters a dead end in one of the guiding plates 243 and flows out from the second port 21. 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 cooperates with the optical fiber seat 1. Therefore, the cooling liquid can flow circumferentially here, and 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 to circulate, flows out from the welding torch, enters the first cooling hole 11, passes through the optical fiber seat 1, and returns to the welding host through the pipeline, thus forming a cooling cycle.

[0069] The ingenuity of the above-mentioned 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 achieves high-efficiency and uniform thermal management of the laser crystal. This not only effectively avoids local overheating, 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 the maintenance cost, bringing significant economic benefits and competitive advantages to users.

[0070] In summary, the present invention effectively overcomes various shortcomings in the prior art, can produce beneficial technical effects, and has remarkable progress.

[0071] 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 completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A handheld laser welding device for preventing welding wire from twisting, characterized in that: include: A welding gun and a welding wire anti-twist device detachably connected to the welding gun, wherein the axes of the welding wire anti-twist device and the welding gun barrel (302) intersect at a nozzle welding position; The welding gun comprises a welding gun head and an output interface which 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 the host through a wiring harness; The welding wire anti-twisting device comprises: a first wire nozzle (40), a second wire nozzle (41) and a quick-release structure (42); the first wire nozzle (40) and the second wire nozzle (41) are both provided with a wire hole (401); the tail end of the first wire nozzle (40) is rotatably matched with the head end of the second wire nozzle (41); the quick-release structure (42) is provided at the outer layer of the matching position of the first wire nozzle (40) and the second wire nozzle (41) and limits the first wire nozzle (40) and the second wire nozzle (41) from unexpected axial sliding.

2. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 1, characterized in that: The inner circular surface of the tail end of the first thread nozzle (40) is rotatably matched with the outer circular surface of the head end of the second thread nozzle (41); The quick-release structure (42) comprises an elastic member (421), a sliding ring (422) and a locking body (423); The elastic member (421) is annular and is sleeved on the outer circumferential surface of the tail end of the first thread nozzle (40); The sliding ring (422) is slidably sleeved outside the elastic member (421) and slidably cooperates with the first thread nozzle (40), and two ends of the elastic member (421) are respectively in contact with the stepped surfaces of the first thread nozzle (40) and the sliding ring (422); A locking hole (424) is radially arranged at the mating portion of the second thread nozzle (41) and the first thread nozzle (40). The locking hole (424) penetrates the first thread nozzle (40) to form a blind hole on the second thread nozzle (41). The locking body (423) is movably arranged in the locking hole (424). The locking hole (424) invades the second thread nozzle (41) but does not penetrate the second thread nozzle (41). A revolving groove (4110) is arranged at a corresponding position on the axis of the second thread nozzle (41). The revolving groove (4110) corresponds to the position of the locking hole. The locking body (423) can roll in the revolving groove. A step (4221) is arranged on the inner circle of the sliding ring (422); Initially, the elastic member (421) causes the step (4221) to match the position of the locking body (423), and causes the locking body (423) to be embedded in the first thread nozzle (40) and the second thread nozzle (41) at the same time; After the sliding ring (422) overcomes the elastic force and moves, the step (4221) and the locking body (423) are misaligned, and the locking body (423) is disengaged from the locking hole (424) of the second thread nozzle (41).

3. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 2, characterized in that: The locking body (423) is a spherical ball, and the locking holes (424) are distributed in at least two groups axially; The second thread nozzle (41) is provided with a limit plate (402) for limiting the sliding range of the sliding ring (422); An annular retaining spring (403) is provided at the end of the second thread nozzle (41). The retaining spring (403) protrudes from the outer circumferential surface of the second thread nozzle (41). The retaining spring (403) abuts against a step (4221) on the inner circumference of the sliding ring (422), thereby limiting the sliding range on this side.

4. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 1, characterized in that: 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.

5. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 4, characterized in that: The laser matching group 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 into each other, the optical fiber output tube (2) cooperates with the laser channel.

6. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 5, characterized in that: Features: The output interface comprises an optical fiber seat (1) and an optical fiber output tube (2), and the optical fiber seat (1) is provided with an optical fiber hole (10); 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 optical fiber hole (10) and the first cooling hole (11) penetrate the optical fiber holder (1) in the axial direction; the optical fiber output tube (2) is installed in the optical fiber hole (10), and both ends of the optical fiber output tube extend beyond the end surface of the optical fiber holder (1); 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).

7. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 6, 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).

8. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 7, 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.

9. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 8, 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 opening (20) and the second opening (21) are both located at a gap between the outer tube (23) and the cooling inner core (24); 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).

10. The handheld laser welding device for preventing welding wire from twisting as claimed in claim 9, 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).

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