Handheld laser welding device with anti-twist welding wire

Abstract

This invention provides a handheld laser welding device for preventing wire twisting, belonging to the field of laser welding technology. It addresses the problem in existing handheld laser welding torches where the wire feed tube easily twists due to torch movement, leading to uneven wire feeding. The handheld laser welding device includes a welding torch and a wire anti-twist device detachably connected to the torch. The anti-twist device includes a first wire nozzle, a second wire nozzle, and a quick-release structure. Both the first and second wire nozzles have wire holes. The tail end of the first wire nozzle rotatably engages with the head end of the second wire nozzle. The quick-release structure is located on the outer layer of the engagement point between the first and second wire nozzles and restricts unintended axial sliding of the first and second wire nozzles. By optimizing the structural design of the wire anti-twist device on the handheld laser welding torch, the problem of wire feed tube twisting due to dragging during welding is effectively avoided, ensuring smooth wire feeding.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, and in particular relates to a handheld laser welding device for preventing welding wire twisting. Background Technology

[0002] In existing technologies, the connection between a handheld laser welding torch and the wire feeder relies on a wire feed tube to achieve continuous wire feeding during the welding process. However, due to the complexity of the welding environment and the high flexibility of torch operation, frequent changes in the torch's position and angle can easily cause physical torsion and deformation of the wire feed tube. This deformation can alter the internal cross-section of the wire feed tube, causing direct friction between the inner wall of the tube and the welding wire, significantly increasing the wire feeding resistance, affecting the continuity and stability of wire feeding, and even leading to wire feeding interruption, severely reducing the efficiency and quality of the welding operation.

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

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a handheld laser welding device for preventing welding wire twisting, which solves the problem that the wire feeding tube of the handheld laser welding gun in the prior art is easily twisted due to the movement of the welding gun, resulting in uneven wire feeding.

[0005] To achieve the above and other related objectives, the present invention provides a handheld laser welding device for preventing welding wire twisting, comprising:

[0006] A welding torch and a welding wire anti-twist device detachably connected to the welding torch, wherein the axis of the welding wire anti-twist device and the axis of the welding torch barrel intersect at the nozzle welding point;

[0007] The welding torch includes a welding torch head and an output interface that fit together. 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 computer via a wire harness.

[0008] The anti-twist device for welding wire includes: a first nozzle, a second nozzle, and a quick-release structure. Both the first nozzle and the second nozzle are provided with a wire hole. The tail end of the first nozzle is rotatably engaged with the head end of the second nozzle. The quick-release structure is disposed on the outer layer of the engagement point of the first nozzle and the second nozzle and restricts the unintended axial sliding of the first nozzle and the second nozzle.

[0009] Optionally, the inner circular surface of the tail end of the first wire nozzle is rotatably engaged with the outer circular surface of the head end of the second wire nozzle;

[0010] The quick-release structure includes an elastic element, a sliding ring, and a locking body;

[0011] The elastic element is annular and is fitted onto the outer circular surface of the tail end of the first thread nozzle;

[0012] The sliding ring is slidably sleeved on the outside of the elastic member and slidably engaged with the first thread nozzle. The two ends of the elastic member respectively abut against the stepped surfaces of the second thread nozzle and the sliding ring.

[0013] The mating part between the second and first threaded nozzles has a locking hole arranged radially. The locking hole penetrates the first threaded nozzle and forms a blind hole on the second threaded nozzle. The locking body is movably disposed in the locking hole. The locking hole enters the second threaded nozzle but does not penetrate it. A rotary groove is provided at a corresponding position on the shaft of the second threaded 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. The two ends of the elastic element abut against the stepped surface of the first threaded nozzle and the step of the sliding ring, respectively.

[0014] Initially, the elastic element causes the step to align with the position of the locking body, and causes the locking body to simultaneously engage in the locking hole of the first threaded nozzle and the rotary groove of the second threaded nozzle.

[0015] After the sliding ring moves against the elastic force, the step and the locking body are misaligned. At the same time, when the second threaded nozzle is pulled out, the locking body disengages from the rotary groove of the second threaded nozzle.

[0016] Optionally, the locking body is a spherical ball, and the locking holes are distributed in at least two sets circumferentially;

[0017] The first thread nozzle is provided with a limiting disc to restrict the sliding range of the sliding ring;

[0018] The end of the first thread nozzle is provided with an annular retaining spring. The retaining spring protrudes from the outer circular surface of the first thread nozzle and abuts against the step on the inner circle of the sliding ring, thereby limiting the range of sliding of the sliding ring toward the end of the first thread nozzle.

[0019] Optionally, the laser welding torch is provided with an output interface at its tail end, and the 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.

[0020] Optionally, the laser mating group includes:

[0021] A laser channel located on one side of the welding torch head;

[0022] And, a fiber optic output tube protruding from the end face of the output interface;

[0023] When the welding torch head and the output interface are plugged in, the optical fiber output tube is matched with the laser channel.

[0024] Optionally,

[0025] The output interface includes a fiber optic socket and a fiber optic output tube, and the fiber optic socket is provided with a fiber optic hole.

[0026] The cooling assembly includes a first medium port and a second medium port located on one side of the welding torch head, and a first cooling hole and a second cooling hole located on one side of the fiber optic base.

[0027] The fiber optic hole and the first cooling hole penetrate the fiber optic base axially, and the fiber optic output tube is installed in the fiber optic hole, with both ends extending beyond the end face of the fiber optic base.

[0028] The fiber optic output tube has a first port at the tail end of the fiber optic base and a second port at the part that mates with the fiber optic base. The first port and the second port are connected inside the fiber optic output tube.

[0029] On the fiber optic base, the second cooling hole is a blind hole drilled from the head end to the tail end. The fiber optic base is provided with a third cooling hole, one end of which is connected to the second cooling hole and the other end is connected to the second port.

[0030] On the welding torch head, the first medium port and the second medium port are connected to the interior of the welding torch head body to form a circuit.

[0031] When the welding torch head and the output interface are plugged in, the first medium port and the second medium port are connected to the first cooling hole and the second cooling hole.

[0032] Optionally, the fiber optic socket has an annular expansion section inside the fiber optic hole, one of the outlets of the third cooling hole is located within the annular expansion section, and the second port on the fiber optic output tube is also located within the annular expansion section.

[0033] And / or, the fiber optic output tube has an annular diameter reduction section in the part that mates with the fiber optic socket, one of the outlets of the third cooling hole is located within the annular diameter reduction section, and the second port on the fiber optic output tube is also located within the annular diameter reduction section.

[0034] 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 bundle and the host. The cooling section cools the end of the fiber optic bundle and the fiber crystal. The output section converts the laser output from the fiber crystal into collimated light.

[0035] Both the first port and the second port are located in the cooling section.

[0036] Optionally, the cooling section includes:

[0037] An outer tube that mates with the fiber optic socket;

[0038] A cooling core is disposed inside the outer tube and has a gap with the outer tube. An optical fiber passes through the cooling core. The optical fiber crystal is disposed at the end of the cooling core and emits laser light.

[0039] The cooling inner core and the outer tube are sealed at both ends, and the first and second ports are both located in the gap between the outer tube and the cooling inner core;

[0040] On the cooling inner core, at the part with the gap between it and the outer tube, a meandering flow channel structure is provided. The medium enters the gap from the first port, flows along the axis of the cooling inner core to the other end, and then flows back in the opposite direction. After meandering at least once, it flows out of the gap from the second port.

[0041] Optionally, the flow channel structure includes a first sealing ring and a second sealing ring disposed at both ends of the gap portion;

[0042] It also includes a guide plate that extends from the first sealing ring to the second sealing ring, then extends circumferentially before contacting the second sealing ring (this part is called the reversing section), and then extends in the opposite direction towards the first sealing ring, stopping before contacting the first sealing ring.

[0043] The height of the guide plate matches the inner diameter of the outer tube. Two sets of guide plates are arranged at 180-degree intervals on the cooling inner core. The first port is connected between the reversing section and the first sealing ring on one of the guide plates, and the second port is connected between the reversing section and the first sealing ring on the other guide plate.

[0044] As described above, the handheld laser welding device for preventing welding wire twisting of the present invention has at least the following beneficial effects:

[0045] By optimizing the structural design of the anti-twist device on the handheld laser welding torch, the problem of wire feeding tube twisting due to dragging during welding is effectively avoided, ensuring the stable shape and inner diameter of the wire feeding tube. This significantly reduces wire feeding resistance and improves the continuity and stability of wire delivery. It not only improves welding efficiency but also significantly enhances welding quality, reduces welding defects caused by poor wire feeding, and brings a significant performance improvement to handheld laser welding technology. Attached Figure Description

[0046] Figure 1 The image shown is an overall schematic diagram of the handheld laser welding device of the present invention.

[0047] Figure 2 The image shown is an overall schematic diagram of the handheld laser welding device of the present invention.

[0048] Figure 3 The diagram shown is a cross-sectional view of the anti-twist device for welding wire of the present invention.

[0049] Figure 4 The diagram shown is a cross-sectional view of the outer casing of the anti-twist device for welding wire of the present invention.

[0050] Figure 5 The image shown is a schematic diagram of the laser welding torch head of the present invention.

[0051] Figure 6 The diagram shown is a schematic of the laser output interface of this invention.

[0052] Figure 7 The diagram shown is a disassembled schematic of the laser output interface of this invention.

[0053] Figure 8 The diagram shown is a cross-sectional view of the laser output interface of the present invention.

[0054] Figure 9 The diagram shown is a cross-sectional view of the optical fiber output tube of this invention.

[0055] Figure 10 The diagram shows the disconnection and cross-section of the optical fiber output tube of the present invention.

[0056] Figure 11 The diagram shown is a schematic of the cooling core of the present invention.

[0057] Figure 12 The diagram shown is a schematic representation of the unfolded flow channel on the cooling inner core of this invention.

[0058] Figure 13 The diagram shown is a schematic of the protective gas interface of the laser welding torch head of the present invention.

[0059] Figure 14 The diagram shown is a schematic of the cooling holes in the laser welding torch head of the present invention.

[0060] Figure 15 The diagram shows a schematic of the rotary groove on the second threaded nozzle of the present invention. The components include: first threaded nozzle 40, thread hole 401, limiting plate 402, retaining ring 403, second threaded nozzle 41, rotary groove 4110, quick-release structure 42, elastic element 421, sliding ring 422, step 4221, locking body 423, locking hole 424, welding wire 92, fiber optic base 1, fiber optic hole 10, annular expansion section 101, first cooling hole 11, second cooling hole 12, third cooling hole 13, protective air hole 14, and contact seat 15. 1. Fiber optic output tube; 2. First port 20, Second port 21, Annular diameter reduction section 22, Outer tube 23, Cooling core 24, First sealing ring 241, Second sealing ring 242, Guide plate 243, Reversing section 2431, Fiber optic crystal 26, Gun barrel 302, First medium port 311, Second medium port 312, Second connecting hole 314, Protective gas interface 315, Electrical signal interface 316, Galvanometer assembly 32, Focusing lens assembly 33. Detailed Implementation

[0061] The following specific embodiments illustrate the implementation 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.

[0062] Please see Figures 1 to 15 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0063] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0064] Please refer to this embodiment. Figures 1-2 An embodiment of the handheld laser welding device for preventing welding wire twisting provided by the present invention includes: a welding torch and a welding wire anti-twist device detachably connected to the welding torch. The axes of the welding wire anti-twist device and the welding torch tube 302 intersect at the nozzle welding point. The welding torch tube 302 is fixed to the welding torch body by a buckle 303. The welding torch includes a welding torch head and an output interface that are mutually mated and interlocked. 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 welding torch head and the output interface have a mating plug-in structure. The wire outlet end of the welding wire anti-twist device matches the welding torch nozzle, and the tail end is connected to the wire feeder through a wire feeding tube.

[0065] The laser welding torch head body is equipped with a galvanometer assembly 32, a focusing lens assembly 33, and a protective lens assembly 34. The galvanometer assembly 32 is located at the connection between the welding section 30 and the gripping section 31 on the welding torch head body, and reflects the laser light entering from the laser channel in the gripping section 31 through the output interface into the welding section 30. The galvanometer assembly 32 and the focusing lens assembly 33 are removable and located in the welding section 30. The laser light entering 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 external welding wire, thereby achieving welding.

[0066] The galvanometer assembly 32 includes a galvanometer motor 321 and a galvanometer lens 322, which is a reflective lens. The galvanometer motor 321 is fixed to the housing, and the galvanometer lens 322 is connected to the output shaft of the galvanometer motor 321. Initially, the plane of the galvanometer lens 322 is perpendicular to the angle 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.

[0067] 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 includes types such as plano-convex lenses and compound lenses. The first drawer box 331 is provided with a through hole, and the focusing lens 332 is installed in the hole. The welding section 30 is provided with a first cavity 304 for the first drawer box 331 to be inserted 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, which can be easily tightened by hand.

[0068] The protective lens assembly 34 includes a second drawer box 341 and a protective lens 342. The second drawer box 341 has a through hole, and the protective lens 342 is installed in the hole. The welding section 30 has 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 with 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 with screws; easily hand-tightened screws can be used.

[0069] Welding wire anti-twist device, such as Figure 2 As shown, it includes: a first threaded nozzle 40, a second threaded nozzle 41, and a quick-release structure 42. Both the first threaded nozzle 40 and the second threaded nozzle 41 are provided with thread holes 401. The tail end of the first threaded nozzle 40 is rotatably engaged with the head end of the second threaded nozzle 41. The quick-release structure 42 is disposed on the outer layer of the engagement point of the first threaded nozzle 40 and the second threaded nozzle 41 and restricts the unintended axial sliding of the first threaded nozzle 40 and the second threaded nozzle 41.

[0070] During welding operations, the welding torch needs to be used in different positions, and the movement of the torch also drags the wire feed tube. In existing technology, both ends of the wire feed tube are fixedly connected to the welding torch or wire feeder. As the welding torch drags the wire feed tube, the wire feed tube may twist and deform, leading to deformation of the wire feed tube cross-section. This phenomenon significantly increases the frictional resistance of the welding wire 92 in the tube, causing problems such as poor wire feeding, uneven speed, and even blockage and jamming. This seriously affects the continuity of welding operations and the quality of the weld. Therefore, welding personnel need to pay close attention to the wire feed tube during operation, straighten the wire feed tube, and prevent the wire feed tube from twisting.

[0071] In the above embodiment, the first nozzle 40 and the second nozzle 41 can rotate relative to each other. The anti-twist device for the welding wire is installed at the wire outlet of the welding torch (see...). Figure 1 The wire feeder is connected to the wire feeder via a wire feed tube. The first nozzle 40 and the second nozzle 41 of the anti-twist device can rotate relative to each other. When the external wire feed tube twists during dragging, the torsional force is transmitted along the wire feed tube to the connection between the second nozzle 41 and the first nozzle 40. The torsional force is dissipated by the relative rotation of the second nozzle 41, thereby preventing the wire feed tube from twisting.

[0072] In the above embodiments, the first wire nozzle 40 and the second wire nozzle 41 can be disengaged; the welding torch head and the output interface connecting to the welding machine host can also be disengaged. This enables flexible disconnection and connection between the wire feed tube and the welding torch, and between the host and the welding torch, greatly improving the convenience of equipment maintenance and reducing downtime. Secondly, it facilitates the quick replacement of the wire feeder model and laser welding host model connected to the currently operating welding torch according to actual needs, thereby changing to different specifications of welding wire and laser source, enhancing operational flexibility and compatibility. Furthermore, when the welding torch is damaged, the wire feeder can be easily connected to a spare welding torch, ensuring continuous production without interruption and reducing economic losses caused by equipment failure.

[0073] Furthermore, such as Figure 2 and Figure 3 As shown, the inner circular surface of the tail end of the first thread nozzle 40 is rotatedly engaged with the outer circular surface of the head end of the second thread nozzle 41.

[0074] The quick-release structure 42 includes an elastic element 421, a sliding ring 422, and a locking body 423;

[0075] The elastic element 421 is annular and fits onto the outer circular surface of the tail end of the first thread nozzle 40;

[0076] The sliding ring 422 is slidably sleeved on the outside of the elastic member 421 and slidably engaged with the first thread nozzle 40. The two ends of the elastic member 421 respectively abut against the stepped surface of the first thread nozzle 40 and the step 4221 of the sliding ring 422.

[0077] The mating part of the second threaded nozzle 41 and the first threaded nozzle 40 is provided with a locking hole 424 in the radial direction. The locking hole 424 penetrates the first threaded nozzle 40 and forms a blind hole on the second threaded nozzle 41. The locking body 423 is movably disposed in the locking hole 424. The formation of a blind hole means that the locking hole enters the second threaded nozzle 41 but does not penetrate the second threaded nozzle 41. A rotary groove 4110 is provided at a corresponding position on the shaft of the second threaded nozzle 41. The rotary groove 4110 corresponds to the position of the locking hole. The area where the locking hole enters the second threaded nozzle 41 is located in the rotary groove 4110. The locking body 423 can roll in the rotary groove and can also 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 in the area outside the locking hole 424, it restricts the movement of the locking body 423 along the axis of the locking hole 424.

[0078] Initially, the elastic element 421 causes the step 4221 to match the position of the locking body 423, and causes the locking body 423 to simultaneously engage the first threaded nozzle 40 and the second threaded nozzle 41. The two cannot move relative to each other axially, but can rotate relative to each other.

[0079] After the sliding ring 422 moves against the elastic force, the step 4221 and the locking body 423 are misaligned, and the locking body 423 disengages from the rotary groove 4110 of the second threaded nozzle 41. The first threaded nozzle 40 and the second threaded 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 threaded nozzle 41 is pulled out from the first threaded nozzle 40, the squeezing 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.

[0080] Furthermore, the locking body 423 is a spherical ball, and the locking holes 424 are distributed in at least two sets circumferentially. In a preferred embodiment, four or five sets are evenly distributed circumferentially to improve the locking performance of the locking body 423 in the locking holes 424 against the relative sliding tendency of the first thread nozzle 40 and the second thread nozzle 41, as well as 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 thread nozzle 41. Since the locking hole 424 is spherical, when the sliding ring 422 is pushed by hand to cause the step 4221 to be misaligned with the locking body 423, and the second thread nozzle 41 is pulled out, the locking body 423 can easily disengage from the rotary groove 4110 on the second thread nozzle 41 under the pushing action of the lateral force. Therefore, the second thread nozzle 41 can be pulled out more easily, realizing the disassembly of the wire feeding tube.

[0081] On the first threaded nozzle 40, a limiting plate 402 is provided to limit the sliding range of the sliding ring 422. The limiting plate 402, the retaining 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 between the various components;

[0082] The end of the first thread nozzle 40 is provided with an annular retaining ring 403. The retaining ring 403 protrudes from the outer surface of the first thread nozzle 40 and abuts against the step 4221 on the inner circle of the sliding ring 422, thus limiting the sliding range on this side.

[0083] In the above embodiment, the quick-release structure 42 is disposed on the outer layer of the mating area of ​​the first threaded nozzle 40 and the second threaded nozzle 41, and restricts the unintended relative sliding of the first threaded nozzle 40 and the second threaded nozzle 41 in the axial direction. This allows them to rotate only when connected, enabling the first threaded nozzle 40 and the second threaded nozzle 41 to rotate relative to each other without unintended disengagement. However, when the quick-release structure 42 is unlocked, the second threaded nozzle 41 can disengage from the first threaded nozzle 40, thereby removing the entire wire feed tube. For example, the wire feed tube can be removed from the welding torch, thus improving the convenience of use and maintenance of the wire feed tube and the end welding torch.

[0084] Please refer to this embodiment. Figures 5-6 The output interface at the tail end of the laser welding torch includes a fiber optic socket 1 and a fiber optic output tube 2. The fiber optic socket 1 is provided with a fiber optic hole 10. 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.

[0085] By integrating multiple key functional components, such as the laser coupling assembly, cooling coupling assembly, shielding gas coupling assembly, and electrical signal coupling assembly, into the mating end face of the welding torch head and output interface, a high degree of interface integration is achieved. This design not only reduces the dispersed 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. Some traditional welding systems design the welding torch head and output interface as a single unit, which increases the reliability of the interface but sacrifices convenience.

[0086] In this embodiment, a single plug-in connection enables the connection of all interfaces, significantly reducing docking time and improving work efficiency. This not only simplifies the operation process but also reduces potential connection errors or leaks caused by too many external interfaces. The standardized interface design not only facilitates compatibility between different welding torch head models 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 maintenance costs.

[0087] The laser assembly includes: a laser channel located on one side of the welding torch head; and an optical fiber output tube 2 protruding from the output interface end face. When the welding torch head and the output interface are inserted, the optical fiber output tube 2 mates with the laser channel. The optical fiber output tube 2 on the output interface is inserted into the laser channel on the welding torch head, and the laser beam is directed into the laser channel. After being reflected by the galvanometer assembly on the welding torch head and focused by the focusing mirror assembly, it is emitted from the nozzle of the welding torch head for welding. The size of the optical fiber output tube 2 matches the laser channel, and the two working together ensure that the laser beam is centered in the laser channel, making the laser propagation direction accurate, increasing the accuracy of the mating parts, and improving the safety of the welding torch.

[0088] The cooling assembly includes: a first medium port 311 and a second medium port 312 located on one side of the welding torch head, and a first cooling hole 11 and a second cooling hole 12 located on one side of the fiber optic base 1; the fiber optic hole 10 and the first cooling hole 11 penetrate the fiber optic base 1 axially, and the fiber optic output tube 2 is installed in the fiber optic hole 10, with both ends extending beyond the end face of the fiber optic base 1; the fiber optic output tube 2 has a first port 20 at the tail end of the fiber optic base 1, and a second port 21 at the part that mates with the fiber optic base 1; the first port 20 and the second port 21... 1. Connected within the fiber optic output tube 2; On the fiber optic base 1, the second cooling hole 12 is a blind hole drilled from the head end to the tail end, and the fiber optic base 1 is provided with a third cooling hole 13, 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 to form a circuit; When the welding gun head and the output interface are plugged in, the first medium port 311 and the second medium port 312 are connected to the first cooling hole 11 and the second cooling hole 12.

[0089] In the above embodiments, combined with Figure 8 and Figure 9 The specific cooling medium flow path is as follows: the coolant enters the fiber optic output tube 2 from the first port 20, flows and exchanges heat within the fiber optic output tube 2, and then flows from the fiber optic output tube 2 to the third cooling hole 13 on the fiber optic base 1 at the second port 21 where the fiber optic output tube 2 mates with the fiber optic base 1. It then flows out from the second cooling hole 12 on the fiber optic base 1, which connects with the second medium port 312, allowing the coolant to enter the welding torch head. Inside the welding torch head, the first medium port 311 and the second medium port 312 connect from the end of the gripping section 31 to the connection between the welding section 30 and the gripping section 31, and are then connected in a loop by the first connecting hole 313. Therefore, the cooling medium entering the second medium port 312 circulates within the welding torch head, flows out from the first medium port 311, returns to the output interface through the first cooling hole 11, and flows directly back to the welding host after passing through the fiber optic base 1.

[0090] The coolant flows efficiently through the fiber optic output tube and the welding torch head, achieving multi-stage cooling of the laser crystal inside the fiber optic output tube, the housing of the laser channel surrounding the fiber optic output tube, and the welding torch head itself. This effectively reduces the operating temperature, especially at the interface, improving the stability and lifespan of the laser welding process. The coolant circulates through a precisely designed flow channel, ensuring uniform and sufficient cooling while minimizing thermal stress damage to the equipment structure. Finally, the coolant is returned directly to the welding host via a reflux system, achieving coolant recycling, saving energy, protecting the environment, and improving the overall system's operating efficiency and reliability.

[0091] The shielding gas assembly includes: a shielding gas inlet 315 located on one side of the welding torch head; and a shielding gas port 14 located on the output port end face. When the welding torch head and the output port are inserted, the shielding gas inlet 315 mates with the shielding gas port 14, and a sealing ring 91 is provided on the mating end face. On the welding torch head, the shielding gas inlet 315 enters the welding torch head body, and after exceeding the range of the shielding lens assembly and the focusing lens assembly 33, it passes through the second connecting hole 314 into the laser channel. (See reference...) Figure 13 .

[0092] The protective gas inlet 315 enters the welding section and the connection between the gripping section from the end of the gripping section, then enters the welding section, passes beyond the range of the protective lens assembly and the focusing lens assembly, and finally enters the laser channel through the second connecting hole 314. Finally, it follows the laser beam from the welding nozzle hole of the welding torch head to the weld point, covering the welding area and providing protection. The second connecting hole 314 extends from the outside of the housing to the inside of the housing, connecting the protective gas inlet 315 to the laser channel at the center of the housing. Finally, the second connecting hole 314 is sealed on the outside of the housing to prevent protective gas leakage.

[0093] The electrical signal coordination group includes: an electrical signal interface 316 located on one side of the welding torch head; and a contact seat 151 located on the output interface end face; when the welding torch head and the output interface are plugged in, the electrical signal interface 316 is electrically connected to the contact seat 151; the welding torch head is provided with a drive circuit board of an anti-static generator assembly, and the lines of the electrical signal interface 316 are connected to the drive circuit board.

[0094] The welding torch head is equipped with a drive circuit board for the galvanometer motor assembly, and the electrical signal interface 316 is connected to the drive circuit board. The drive circuit board can be mounted on the housing where the galvanometer assembly is installed, with one side of the drive circuit board close to the galvanometer motor. In the prior art, the drive circuit board for the galvanometer motor is generally located in the welding host, connected to the output interface via a wiring harness, and then connected to the galvanometer motor via the output interface and the welding torch head. The communication between the galvanometer motor and the drive circuit board inside the welding host is an analog signal controlling the galvanometer motor's movement. After long-distance transmission, the signal is easily interfered with, leading to a decrease in the accuracy of the galvanometer motor's response to the control signal.

[0095] In this embodiment, the drive circuit board controlling the galvanometer motor is located at the welding torch head. The close proximity of the drive circuit board to the galvanometer motor minimizes interference with the analog signal. Furthermore, communication between the drive circuit board and the welding host can be achieved via digital signals, such as using Modbus, Profibus, or CAN bus with appropriate communication protocols. This ensures the accuracy and integrity of the control signals, allowing the galvanometer motor to respond precisely and improving welding quality.

[0096] As a further embodiment of the cooling system, please refer to [link / reference]. Figure 7 On the fiber optic socket 1, an annular expansion section 101 is provided inside the fiber optic hole 10. One of the outlets of the third cooling hole 13 is located within the annular expansion section 101. The second port 21 on the fiber optic output tube 2 is also located within the annular expansion section 101.

[0097] And / or, on the fiber optic output tube 2, the part that mates with the fiber optic base 1 is provided with an annular diameter reduction section 22, one of the outlets of the third cooling hole 13 is located within the annular diameter reduction section 22, and the second port 21 on the fiber optic output tube 2 is also located within the annular diameter reduction section 22.

[0098] The second port 21 is located on the circumference of the fiber optic output tube 2 and serves as the liquid outlet. The third cooling hole 13 is located on the fiber optic mount 1 in the area where it mates with the fiber optic output tube 2. The annular reducing section 22 / annular expanding section 101 creates an annular connecting area between the mating area of ​​the fiber optic output tube 2 and the fiber optic mount 1, allowing the second port 21, the third cooling hole 13, and the second cooling hole 12 to communicate. When the cooling medium enters the annular reducing section 22 / annular expanding section 101 from the second port 21, it can reach one side of the third cooling hole 13, flow out through the third cooling hole 13 and then into the welding gun end that connects to the output interface. On both sides of the annular area where the third cooling hole 13 and the second port 21 communicate, the mating interface between the fiber optic mount 1 and the fiber optic output tube 2 is provided with a first sealing ring 90 to prevent the cooling medium in the annular reducing section 22 / annular expanding section 101 from leaking axially.

[0099] The two sides of the connection between the third cooling hole 13 and the second port 21 are approximately 180 degrees apart. This is to facilitate the design of a flow channel inside the fiber optic output tube 2, so that the coolant has a longer flow path inside the fiber optic output tube 2 and can fully cover the surface of the inner core.

[0100] Please refer to this embodiment. Figures 5-10The fiber optic output tube 2 includes a tail section, a cooling section, and an output section connected in sequence. The tail section connects the fiber optic bundle to the host computer. The cooling section cools the ends of the fiber optic bundle and the fiber crystal 26. The output section converts the laser output from the fiber crystal 26 into collimated light. Spherical lenses, aspherical lenses, and cylindrical lenses can be used. The fiber crystal can be a commercially available product, but it is not the focus of this solution; the focus is on its cooling. The first port 20 and the second port 21 are both located in the cooling section. The first port 20 is located at the rear of the fiber optic connector 1 where it mates with the fiber optic output tube 2, and the second port 21 is located at the point where the fiber optic connector 1 mates with the fiber optic output tube 2.

[0101] The cooling section includes:

[0102] The outer tube 23 mates with the fiber optic socket 1 on its outer periphery;

[0103] A cooling 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 core 24, and an optical fiber crystal 26 is disposed at the end of the cooling core 24 and emits laser light. The optical fiber crystal 26 and the cooling core 24 are integrated, so they can conduct heat to each other. To accelerate heat dissipation efficiency, the cooling core 24 can be made of a material with high thermal conductivity, such as metal, like copper.

[0104] The cooling inner core 24 and the outer tube 23 are sealed at both ends. The first port 20 and the second port 21 are both located in the gap between the outer tube 23 and the cooling inner core 24. Therefore, after the coolant flows in from one port, it can flow out from the other port, absorbing heat from the cooling inner core 24 in the process.

[0105] On the cooling inner core 24, at the part with the gap between it and the outer tube 23, a meandering flow channel structure is provided. The medium enters the gap 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. After meandering at least once, it flows out of the gap from the second port 21.

[0106] The main principles of the above embodiments are as follows: (See reference) Figure 8 , Figure 9 The first port 20 is located at the tail end of the fiber optic output tube 2. The coolant enters the gap 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. At the same time, it absorbs the heat generated by the 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 narrowing section 22 / annular widening section 101 where the fiber optic output tube 2 and the fiber optic base 1 cooperate. Therefore, the coolant can flow in a circle here. Then it reaches the third cooling hole 13 on the fiber optic base 1 and flows through the third cooling hole 13 to the second cooling hole 12. Then it enters the welding gun at the docking end for circulation, flows out from the welding gun, enters the first cooling hole 11, passes through the fiber optic base 1, and flows back to the welding host through the pipeline, thus forming a cooling cycle.

[0107] The cooling system designed in this embodiment significantly improves the thermal management efficiency and stability of the fiber optic interface through ingenious flow channel layout and structural integration. Specifically, the coolant is precisely introduced from the first inlet, making full use of the complex and efficient meandering flow channel between the cooling core and the outer tube. This achieves immediate and comprehensive absorption of heat generated by the fiber optic crystal, effectively reducing the operating temperature and ensuring the performance and lifespan of the fiber optic components. In particular, when the coolant flows through the annular narrowing / expansion section where the fiber optic output tube meets the fiber optic socket, its circumferential flow characteristics internalize the flow channel, avoiding external interfaces, simplifying the structure, and improving stability.

[0108] Furthermore, through the careful layout and seamless connection of the third cooling hole, the second cooling hole and the first cooling hole, the coolant smoothly enters the welding torch and completes circulation. This process not only achieves a completely closed-loop circulation of the coolant, but also significantly simplifies the external connection of the cooling system, avoids external leakage of pipes and the risk of leakage that may be caused by complicated pipes, and improves the reliability and ease of maintenance of the overall system.

[0109] The cooling system in this embodiment achieves a high degree of integration of the coolant structure and full coverage of the cooling channels. This not only precisely controls the temperature fluctuations at the interface during the welding process, ensuring the high quality and consistency of fiber optic welding, but also significantly optimizes the system's complexity and operating efficiency, bringing a more stable, efficient, and economical fiber optic interface solution to the welding work.

[0110] Please refer to this embodiment. Figures 9-11 The flow channel structure includes a first sealing ring 241 and a second sealing ring 242 located at both ends of the gap.

[0111] It also includes a guide plate 243, which extends from the first sealing ring 241 to the second sealing ring 242. Before contacting the second sealing ring 242, it extends along the circumference. This part is called the reversing 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.

[0112] The height of the guide plate 243 matches the inner diameter of the outer tube 23. Two sets of guide plates 243 are arranged on the cooling inner core 24 at 180 degrees apart. 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.

[0113] In the above embodiments, the flow path of the cooling medium is as follows: (See attached image) Figure 12 , Figure 12 To be Figure 11 The flow channel layout of the 24 cooling channel sections of the cylindrical cooling core after unfolding into a plane should be noted. Figure 12 In the middle, the upper and lower side lines are the same side line, which is the development line of a cylinder. At the gap between the cooling inner core 24 and the outer tube 23, both ends are isolated by the first sealing ring 241 and the second sealing ring 242 respectively. Coolant enters from the first port 20 and flows along... Figure 12 The coolant flows towards the first sealing ring 241 along the dashed line. After reaching the first sealing ring 241, it flows in the opposite direction along the dashed line towards the second sealing ring 242. After reaching the second sealing ring 242, it flows towards the upper or lower side of the diagram (in reality, when the unfolded plane is restored to a cylinder, the upper and lower sides of the diagram are the same side). Then it flows in the opposite direction again towards the first sealing ring 241. After reaching the first sealing ring 241, it flows in the opposite direction again into the dead end on one of the guide plates 243 and flows out from the second port 21. The second port 21 is located at the annular narrowing section 22 / annular widening section 101 where the fiber optic output tube 2 and the fiber optic base 1 cooperate. Therefore, the coolant can flow in a circle here. Then it reaches the third cooling hole 13 on the fiber optic base 1 and flows through the third cooling hole 13 to the second cooling hole 12. Then it enters the welding gun at the docking end for circulation. After flowing out of the welding gun, it enters the first cooling hole 11, passes through the fiber optic base 1, and flows back to the welding host through the pipeline, thus forming a cooling cycle.

[0114] The ingenious design of the aforementioned flow channel ensures that the cooling medium can flow omnidirectionally and without dead zones along the surface of the cooling core. This characteristic greatly enhances the cooling effect, achieving highly efficient and uniform thermal management of the laser crystal. This not only effectively avoids localized overheating, ensuring the optimal operating state and long-term stability of the laser crystal, but also promotes precise control of the interface temperature during welding, improving welding quality and production efficiency. Simultaneously, the comprehensive cooling strategy extends the equipment's lifespan, reduces maintenance costs, and brings significant economic benefits and competitive advantages to users.

[0115] In summary, the present invention effectively overcomes the various shortcomings of the prior art, produces beneficial technical effects, and has made significant progress.

[0116] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in 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 twisting, characterized in that, include: The welding torch and the welding wire anti-twist device detachably connected to the welding torch intersect the axis of the welding torch barrel (302) at the nozzle welding point; The welding torch includes a welding torch head and an output interface that fit together. 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 computer via a wire harness. The anti-twist device for welding wire includes: 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 each provided with a wire hole (401). The quick-release structure (42) is disposed on the outer layer of the mating part of the first wire nozzle (40) and the second wire nozzle (41) and restricts the unintended axial sliding of the first wire nozzle (40) and the second wire nozzle (41). The inner circular surface of the tail end of the first thread nozzle (40) is rotated to engage with the outer circular surface of the head end of the second thread nozzle (41); The quick-release structure (42) includes an elastic element (421), a sliding ring (422), and a locking body (423). The elastic element (421) is annular and is fitted onto the outer circular surface of the tail end of the first thread nozzle (40); The sliding ring (422) is slidably sleeved on the outside of the elastic member (421) and slidably engaged with the first thread nozzle (40). The first threaded nozzle (40) is provided with a locking hole (424) in the radial direction. The locking hole (424) passes through the first threaded nozzle (40) and is located at the mating part of the second threaded nozzle (41) and the first threaded nozzle (40). The locking body (423) is movably disposed in the locking hole (424). A rotary groove (4110) is provided at a corresponding position on the shaft of the second threaded nozzle (41). The rotary groove (4110) corresponds to the position of the locking hole. The locking body (423) can roll in the rotary groove. A step (4221) is provided on the inner circle of the sliding ring (422). The two ends of the elastic element (421) abut against the first threaded nozzle (40) and the step (4221) of the sliding ring (422), respectively. Initially, the elastic element (421) causes the step (4221) to match the position of the locking body (423), and causes the locking body (423) to simultaneously embed into the locking hole (424) of the first threaded nozzle (40) and the rotary groove (4110) of the second threaded nozzle (41); After the sliding ring (422) moves against the elastic force, the step (4221) and the locking body (423) are misaligned. At the same time, when the second threaded nozzle (41) is pulled out, the locking body (423) disengages from the rotary groove (4110) of the second threaded nozzle (41).

2. The handheld laser welding device for preventing welding wire twisting as described in claim 1, characterized in that: The locking body (423) is a spherical ball, and the locking holes (424) are distributed in at least two sets in the circumferential direction; On the first thread nozzle (40), a limiting plate (402) is provided to limit the sliding range of the sliding ring (422). The end of the first thread nozzle (40) is provided with an annular retaining ring (403). The retaining ring (403) protrudes from the outer circular surface of the first thread nozzle (40). The retaining ring (403) abuts against the step (4221) on the inner circle of the sliding ring (422), limiting the range of the sliding ring (422) sliding toward the end of the first thread nozzle (40).

3. The handheld laser welding device for preventing welding wire twisting as described in claim 1, characterized in that, The laser welding torch has an output interface at its tail end. The 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.

4. The handheld laser welding device for preventing welding wire twisting as described in claim 3, characterized in that, The laser coordination group includes: A laser channel located on one side of the welding torch head; And, the fiber optic output tube (2) protruding from the end face of the output interface. When the welding torch head and the output interface are plugged in, the optical fiber output tube (2) is engaged with the laser channel.

5. The handheld laser welding device for preventing welding wire twisting as described in claim 4, characterized in that, The output interface includes an optical fiber socket (1) and an optical fiber output tube (2), and the optical fiber socket (1) is provided with an optical fiber hole (10). The cooling assembly includes a first medium port (311) and a second medium port (312) located on one side of the welding torch head, and a first cooling hole (11) and a second cooling hole (12) located on one side of the fiber optic base (1). The fiber hole (10) and the first cooling hole (11) penetrate the fiber seat (1) axially, and the fiber output tube (2) is installed in the fiber hole (10), with both ends extending beyond the end face of the fiber seat (1). The fiber optic output tube (2) has a first port (20) at the tail end of the fiber optic base (1) and a second port (21) at the part that mates with the fiber optic base (1). The first port (20) and the second port (21) are connected inside the fiber optic output tube (2). On the fiber optic base (1), the second cooling hole (12) is a blind hole drilled from the head end to the tail end. The fiber optic base (1) is provided with a third cooling hole (13). 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 torch head, the first medium port (311) and the second medium port (312) are connected to the interior of the welding torch head body to form a circuit; When the welding torch head and the output interface are plugged in, the first medium port (311) and the second medium port (312) are connected to the first cooling hole (11) and the second cooling hole (12).

6. The handheld laser welding device for preventing welding wire twisting as described in claim 5, characterized in that: The fiber hole (10) on the fiber optic base (1) is provided with an annular expansion section (101), one of the outlets of the third cooling hole (13) is located within the range of the annular expansion section (101), and the second port (21) on the fiber optic output tube (2) is located within the range of the annular expansion section (101). Alternatively, the portion of the fiber optic output tube (2) that mates with the fiber optic base (1) may have an annular reduced diameter section (22), one of the outlets of the third cooling hole (13) may be located within the annular reduced diameter section (22), and the second port (21) on the fiber optic output tube (2) may be located within the annular reduced diameter section (22).

7. The handheld laser welding device for preventing welding wire twisting as described in claim 6, characterized in that: The fiber optic 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 fiber optic bundle and the host. The cooling section cools the end of the fiber optic bundle and the fiber crystal (26). The output section converts the laser output by the fiber crystal (26) into collimated light. The first port (20) and the second port (21) are both located in the cooling section.

8. The handheld laser welding device for preventing welding wire twisting as described in claim 7, characterized in that: The cooling section includes: The outer tube (23) mates with the fiber optic base (1) on its outer periphery; A cooling 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 core (24). The optical fiber crystal (26) is disposed at the end of the cooling core (24) and emits laser light. The cooling inner core (24) and the outer tube (23) are sealed at both ends. The first port (20) and the second port (21) are both located in the gap between the outer tube (23) and the cooling inner core (24). The cooling inner core (24) is provided with a meandering flow channel structure in the part with the gap between it and the outer tube (23). The medium enters the gap 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. After meandering at least once, it flows out of the gap from the second port (21).

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