Hand-held welding torch and hand-held laser welding device

Abstract

The application discloses a handheld welding gun and a handheld laser welding device. The handheld welding gun is internally provided with an optical path channel extending along a first direction, and comprises a gun body internally provided with a mounting cavity, and a side surface of the gun body is provided with a pop-up opening in communication with the mounting cavity; and a protective lens quick-release module comprises a lens fixing drawer used for bearing a protective lens, the lens fixing drawer is configured to be able to reciprocate between the mounting cavity and the pop-up opening along a second direction perpendicular to the first direction; the lens fixing drawer is provided with a protective lens window, and when the lens fixing drawer is in a mounting position in the mounting cavity, the protective lens window exposes a symbol provided on a surface of the protective lens along a third direction. According to the technical scheme, the symbol information on the lens can be intuitively and quickly read without pulling out the lens fixing drawer, and the use state information of the protective lens can be confirmed at any time.

Description

Technical Field

[0001] This application relates to the field of welding equipment technology, and in particular to a handheld welding torch and a handheld laser welding device. Background Technology

[0002] In handheld laser welding devices, a protective lens is installed on the optical path inside the handheld welding torch to isolate the fumes and spatter generated during the welding process.

[0003] In existing technologies, protective goggles are typically mounted along the optical axis using a detachable installation structure. However, the replacement operation using this method is time-consuming and laborious due to the lack of a convenient quick-release mechanism, affecting welding efficiency. Furthermore, protective goggles usually have identification symbols indicating their usage status, such as symbols indicating the number of rotations. After the protective goggles are installed in the corresponding position, the operator cannot directly observe the lens information without pulling out the drawer, making it difficult to quickly and effectively confirm the lens status during daily use, thus affecting operational safety and maintenance efficiency. Summary of the Invention

[0004] In view of the technical problems in the prior art, such as the difficulty in quickly and effectively confirming the information of the protective goggles of handheld laser welding devices and the cumbersome operation of replacing the protective goggles, this application provides a handheld welding torch and a handheld laser welding device.

[0005] This application provides a handheld welding torch with a quick-release protective lens function. The torch has an internal optical path extending along a first direction and includes a torch body and a quick-release protective lens module. The torch body has an internal mounting cavity, and a pop-out opening communicating with the mounting cavity is located on the side of the torch body. The quick-release protective lens module includes a lens retaining drawer for holding the protective lens. The lens retaining drawer is configured to reciprocate between the mounting cavity and the pop-out opening along a second direction perpendicular to the first direction. The lens retaining drawer has a protective lens viewing window. When the lens retaining drawer is in the mounting position within the mounting cavity, the protective lens viewing window exposes symbols on the surface of the protective lens along a third direction. This allows the operator to intuitively and quickly read the symbol information on the lens from the torch body or other transparent areas corresponding to the third direction without having to pull out the lens retaining drawer. This facilitates immediate confirmation of the protective lens's usage status, improving operational safety and maintenance efficiency. Simultaneously, the quick-release module, which can be pulled out along the second direction, makes the inspection and replacement of the protective lens more efficient and reliable.

[0006] In some embodiments, the handheld welding torch further includes a locking component disposed on the torch body, the locking component including a push block exposed on the surface of the torch body; wherein the push block is configured to slide parallel to the first direction; when the push block is slid along the first direction under force, the locking component releases the lock on the lens fixing drawer, allowing the lens fixing drawer to move out toward the pop-out opening direction, the lens fixing drawer automatically pops out under the drive of the elastic element and can be completely removed, realizing one-handed quick replacement of the protective goggles, significantly improving the convenience of maintenance operations and reducing replacement time costs. The sliding operation direction of the push block and the pop-out direction of the lens fixing drawer are independent of each other and orthogonal, making it difficult for the axial force and lateral force applied to the torch body during normal welding grip operations to trigger mis-locking, ensuring safety in use.

[0007] In some embodiments, the guiding component includes a sleeve fixedly connected at one end to the inner wall of the gun body and a guide rod slidably fitted within the inner cavity of the sleeve. The axis of the sleeve extends along a second direction, and an elastic element is pre-compressed and disposed between the bottom of the inner cavity of the sleeve and the guide rod. The engagement length of the guide rod and the sleeve along the second direction is configured such that when the lens fixing drawer is ejected under the drive of the elastic element to completely detach from the mounting cavity, the guide rod, along with the lens fixing drawer, completely retracts along the second direction and detaches from the sleeve, allowing the lens fixing drawer and the guide rod to be completely removed from the gun body as a whole. This allows the operator to complete the replacement of protective goggles in a clean environment away from the welding site, reducing the risk of secondary contamination.

[0008] In some embodiments, the locking component includes a locking part fixedly connected to the inner side of the push block, and a locking pin disposed on the locking part and extending along a first direction. A locking hole with an opening along the first direction is provided on the side wall of the lens fixing drawer. The locking pin is configured to translate along the first direction with the push block to insert into the locking hole for mechanical locking or to disengage from the locking hole to release the lock. Two locking pins are spaced apart, forming a double-point mechanical lock, reliably fixing the lens fixing drawer in the first direction. One end of the reset elastic member abuts against the rearward-facing end face of the push block, and the other end abuts against the stop surface of the gun body inner wall, continuously applying a forward-facing reset elastic force to the push block. This maintains the locking pin in the locked position inserted into the locking hole when no external force is applied, and automatically resets after the operator releases the push block, achieving automatic locking when the lens fixing drawer is pushed in.

[0009] In some embodiments, the air inlet of the main gas channel is located on the opposite side of the gun body to the ejection opening. The air inlet and the ejection opening are located on opposite sides of the gun body in the second direction, so that the outer surface of the gun body on the ejection side has an open operating area without pipe obstruction. The operator can complete the removal and insertion of the lens fixing drawer with one hand. At the same time, the structural load on both sides of the gun body tends to be symmetrical, which is conducive to improving the center of gravity balance of the operator when holding it.

[0010] In some embodiments, the protective goggles are eccentrically positioned in the central region, which further has an adjustment area opening at the edge. The gun body is provided with an adjustment mechanism movably connected to the outer edge of the protective goggles via the adjustment area. This mechanism is configured to drive the protective goggles to rotate around a circumference to adjust the effective optical area, so that the protective goggles do not need to be replaced immediately when they are partially contaminated, thus further extending the effective service life of the protective goggles.

[0011] This application also provides a handheld laser welding device, including a main unit and a handheld welding torch as described in any of the above aspects. The handheld welding torch is connected to the main unit via an armored cable, and the main unit supplies protective gas to the main gas channel inside the handheld welding torch via the armored cable. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the handheld laser welding device of the present invention; Figure 2 This is an axial sectional view of the handheld welding torch of the handheld laser welding device of the present invention; Figure 3 This is another axial sectional view of the handheld welding torch of the handheld laser welding device of the present invention; Figure 4 This is a schematic diagram of the front ring and middle ring combination structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 5A This is a schematic diagram of the front end face structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 5B This is a schematic diagram of the front ring cross-sectional structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 5C This is a schematic diagram of the front ring rear end face structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 6A This is a schematic diagram of the front end face structure of the middle ring of the airflow guide component of the handheld laser welding device of the present invention; Figure 6B This is a schematic diagram of the cross-sectional structure of the middle ring of the airflow guide component of the handheld laser welding device of the present invention; Figure 6C This is a schematic diagram of the middle ring rear end face structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 7A This is a schematic diagram of the rear ring front end face structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 7B This is a schematic diagram of the rear ring cross-sectional structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 7C This is a schematic diagram of the rear ring rear end face structure of the airflow guide component of the handheld laser welding device of the present invention; Figure 8 This is a schematic diagram of the air outlet structure of another embodiment of the airflow guide component of the handheld laser welding device of the present invention; Figure 9 This is a partial cross-sectional view of the handheld welding torch of the present invention; Figure 10 This is a schematic diagram of the first unlocked state of the handheld welding torch of the present invention; Figure 11 This is a schematic diagram of the overall assembly state of the protective lens quick-release module and locking component of the handheld welding torch of the present invention. Figure 12 This is a schematic diagram of the second unlocked state of the handheld welding torch of the present invention; Figure 13 This is a schematic diagram of the lens fixing drawer and push block of the handheld welding gun of the present invention; Figure 14 This is an enlarged cross-sectional view of the quick-release module for the protective lens and the locking component of the handheld welding torch of the present invention inside the torch body.

[0013] Reference numerals: 10. Main unit; 20. Handheld welding torch; 21. Nozzle; 22. Torch shaft; 221. Inner wall of torch shaft; 23. Optical path channel; 24. Torch body; 241. Pop-out opening; 242. Mounting cavity; 243. Positioning groove; 25. Main gas channel; 26. Protective goggles; 30. Quick-release module for protective lenses; 31. Lens fixing drawer; 311. Side wall; 312. Central area; 313. Protective goggle window; 314. Adjustment area; 315. Locking hole; 32. Guide component; 33. Tube sleeve; 34. Guide rod; 40. Locking component; 41. Push 42. Locking part; 43. Locking pin; 44. Reset elastic element; 50. Airflow guiding mechanism; 51. Front ring; 511. Positioning boss; 512. Annular plane; 513. Inclined surface; 514. Sunken step; 515. First positioning hole; 52. Middle ring; 521. First positioning pin; 522. Boss structure; 523. Second positioning hole; 524. First air groove; 53. Rear ring; 531. Second positioning pin; 532. Concentric annular step flange; 54. Airflow guiding element; 541. First outlet; 542. Second outlet; 60. Armored cable. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0015] It should be noted that, unless otherwise stated or limited, all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0016] It should also be noted that, unless otherwise stated or limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be an intervening element present. When an element is referred to as "connected to" another element, it may be directly connected to the other element or there may be an intervening element present.

[0017] Furthermore, unless otherwise stated or limited, the descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0018] refer to Figure 1 and Figure 2 This embodiment provides a handheld laser welding device, which includes a main unit 10 and a handheld welding torch 20. The handheld welding torch 20 is connected to the main unit 10 via an armored cable 60. Shielding gas enters the main gas channel 25 inside the handheld welding torch 20 from the main unit 10 via the armored cable 60. The main gas channel 25 merges with the optical path channel 23 at the torch shaft 22 and is then output from the nozzle 21 to form a protective atmosphere above the weld pool to prevent oxidation.

[0019] The protective goggle 26 is installed on the optical path channel 23 inside the gun barrel 22. The protective goggle 26 is located on the axial upstream side of the main gas channel 25 confluence position, and is used to isolate the optical element area inside the gun barrel 22 from the welding fumes and spatter on the nozzle 21 side.

[0020] The handheld laser welding device further includes an airflow guiding mechanism 50, which is positioned at the junction of the main gas channel 25 and the welding torch 22. This mechanism distributes the protective gas from the main gas channel 25 into two airflows projecting in different directions. This allows for simultaneous protection of the protective goggle 26 surface with a lateral air curtain and a tilted, accelerated protective jet towards the nozzle 21, all under a single gas source input. This solves the technical problem in existing technologies where a single outlet design makes it difficult to control total gas consumption while simultaneously protecting the protective goggle 26 from contamination and the weld pool. The following sections will describe in detail the structural form of each component of the airflow guiding mechanism 50, their assembly relationships, the complete flow path of the protective gas, and the corresponding technical effects.

[0021] refer to Figure 2 and Figure 3 The airflow guiding mechanism 50 includes at least one airflow guide 54, which is coaxially disposed on the inner wall 221 of the gun barrel 22 and assembled around the axis of the optical path channel 23.

[0022] The direction along the laser beam propagation direction is defined as the axial front, that is, the direction from the protective mirror 26 to the nozzle 21 is the axial front, and the opposite is the axial rear. The front end, rear end, front side and rear side used in the following description are all defined in this way.

[0023] refer to Figure 3 As shown in the axial cross-sectional view, the airflow guide 54 is composed of a front ring 51, a middle ring 52 and a rear ring 53 stacked and spliced ​​sequentially along the axial direction of the gun barrel 22. The front ring 51 is located at the front end of the axial direction, i.e., on the side close to the nozzle 21, the rear ring 53 is located at the rear end of the axial direction, i.e., on the side close to the protective mirror 26, and the middle ring 52 is sandwiched between the front ring 51 and the rear ring 53.

[0024] refer to Figure 3 as well as Figure 4 The front ring 51, middle ring 52, and rear ring 53 are stacked tightly in sequence along the axial direction. The inner circumferential walls of the three rings together define a central through-hole coaxial with the optical path channel 23. The laser beam propagates unobstructed forward along the axial direction through this central through-hole to the nozzle 21. The outer circumferential walls of the three rings and the inner wall 221 of the gun barrel form a distribution cavity before the protective gas enters the airflow guide 54. After the protective gas enters the distribution cavity through the main gas channel 25, the gas pressure is evenly distributed throughout the circumference and then guided into the first outlet 541 and the second outlet 542.

[0025] The front ring 51, middle ring 52, and rear ring 53 are locked together circumferentially in an axially stacked state through their respective positioning structures, forming two independent throttling gas outlets, the first outlet 541 and the second outlet 542, with different exhaust directions. The first outlet 541 is located on the airflow guide 54 near the rear axial side of the protective mirror 26, with its exhaust direction perpendicular to the axis of the gun barrel 22, ejecting radially inward to form a transverse air curtain in front of the protective mirror 26. The second outlet 542 is located on the front axial side of the airflow guide 54 near the nozzle 21, with its exhaust direction inclined towards the nozzle 21 to form an accelerated protective airflow propagating towards the nozzle 21.

[0026] In some optional embodiments, the air outlet 542 is perpendicular to the axial direction of the gun barrel 22. The vertically arranged second outlet 542 can form a second transverse air curtain independent of the first outlet 541 in the optical path channel 23, achieving dual protection and significantly improving the anti-contamination reliability of the protective mirror 26. At the same time, its outflow does not contain an axial component, avoiding interference with the molten pool protection jet, and the structure is simpler, which is conducive to reducing processing costs and ensuring consistent airflow distribution.

[0027] refer to Figure 5A , Figure 5B and Figure 5C The front ring 51 is annular with a central through-hole, and in some alternative embodiments, the front ring 51 has the largest axial thickness among the three rings. (See reference) Figure 5A The front end view of the front ring 51 shown, i.e., the end face facing the nozzle 21, shows that the outer circumference of the front ring 51 has a plurality of outwardly protruding ear-shaped positioning bosses 511 evenly distributed along the circumferential direction. Each positioning boss 511 protrudes radially outward from the outer circumferential wall surface and is used to cooperate with the corresponding positioning groove 243 on the inner wall 221 of the gun barrel to achieve circumferential anti-rotation positioning of the front ring 51 within the gun barrel 22 and to restrict the front ring 51 from axially disengaging forward. The front end face of the front ring 51 (the end face facing the nozzle 21) has at least one flat annular plane 512. (Reference) Figure 5BIn a cross-sectional view, the rear end face of the front ring 51 facing the protective mirror 26 has an inclined surface 513 structure in the inner circumferential edge region. This inclined surface 513 originates from the rear end edge of the inner circumferential wall, extends radially outward while inclined axially rearward (i.e., towards the protective mirror 26), forming an inclined inner cone surface in the inner circumferential region of the rear end face. Alternatively, in an embodiment where the second outlet 542 is set in a vertical outflow direction, the rear end face of the front ring 51 facing the protective mirror 26 can be a flat annular plane to cooperate with the second air groove on the front end face of the middle ring 52 to form a vertical outlet. The inclined surface 513 is used to guide the protective airflow in an inclined direction towards the front of the nozzle 21. In some alternative embodiments, this inclined surface 513 can be a plane, a flared shape, or an arc surface; no strict limitation is made here. Specifically, when the protective gas from the main gas passage 25 flows through the passage between the middle ring 52 and the rear ring 53 to the inclined surface 513 of the front ring 51, the inclined surface 513 deflects the flow direction of the airflow from the combined direction of the radial and axial components to the inclined direction along the inclined surface 513, causing the airflow to exit from the second outlet 542 at an angle inclined towards the front of the nozzle 21. This angle is determined by the angle between the inclined surface 513 and the axis. Radially outside the inclined surface 513, the rear end face of the front ring 51 is further provided with a recessed step 514, which defines the outer boundary of the second outlet 542 in the radial direction. Further, the inclined surface 513 of the front ring 51 is surrounded by the recessed step 514 of the front ring 51. In an alternative embodiment, the recessed step 514 has two recessed edges, and a plurality of these recessed edges extend radially parallel. In another alternative embodiment, the recessed step 514 has an inclined inner surface. (Reference) Figure 5C The rear end view of the front ring 51 shown (facing the end face of the protective mirror 26) shows that the inner circumferential region of the rear end face of the front ring 51 has a plurality of first positioning holes 515. These first positioning holes 515 are distributed circumferentially along the outer circumferential region of the rear end face, and are used to cooperate with corresponding positioning pins on the front end face of the middle ring 52 to achieve circumferential anti-rotation positioning between the front ring 51 and the middle ring 52. In some optional embodiments, the first positioning hole 515 can also be implemented as a positioning post, a magnetic structure, etc., and this application does not impose excessive limitations.

[0028] refer to Figure 6A , Figure 6B and Figure 6C At least one intermediate ring 52 is disposed behind the front ring 51. The intermediate ring 52 is also annular with a central through-hole. In some alternative embodiments, the axial thickness of the intermediate ring 52 is thinner than that of the front ring 51 to reduce the overall thickness of the entire airflow guide 54. (Reference) Figure 6AThe front view of the middle ring 52 shown is the end face facing the front ring 51. Multiple first positioning pins 521 are distributed symmetrically along the circumference of the front face of the middle ring 52. The first positioning pins 521 protrude forward axially and are inserted into corresponding first positioning holes 515 on the rear end face of the front ring 51. This achieves mutual anti-rotation locking between the front ring 51 and the middle ring 52 in the circumferential direction, ensuring a predetermined relative relationship between the arc-shaped opening position of the first air groove 524 of the front ring 51 and the circumferential position of the boss structure on the front face of the middle ring 52, thereby ensuring that the position of the second outlet 542 remains fixed in the circumferential direction. Further reference... Figure 6B In the side view, a boss structure 522 protrudes forward from the lower part of the front end face of the middle ring 52. This boss structure 522 mates with the inclined surface 513 of the rear end face of the front ring 51 and is surrounded by a recessed step 514, forming a controlled gap channel between them. This gap channel is the second outlet 542. The boss structure 522 is inserted into the corresponding position of the rear end face of the front ring 51, and together with the inclined surface 513 of the front ring 51, it defines the radial circumferential range of the second outlet 542. More specifically, the second outlet 542 is jointly defined by the inclined surface 513 of the rear end face of the front ring 51, the recessed step 514 of the front ring 51, and the front side of the boss structure 522 of the front end face of the middle ring 52. The outlet section of the second outlet 542 is a narrow slit in the axial section, and the gas outlet direction is inclined towards the front of the nozzle 21 due to the guidance of the inclined surface 513 of the front ring 51. Reference Figure 6C The rear end view of the middle ring 52 shown, i.e., the end face facing the rear ring 53, shows that the rear end face of the middle ring 52 is a flat annular plane with multiple second positioning holes 523. Below the rear end face of the middle ring 52 is an annular groove, i.e., a first air groove 524, the depth of which is less than the thickness (i.e., the axial thickness) of the boss structure 522. Furthermore, the first air groove 524 or the first outlet 541 has multiple edges that gradually narrow from the outer circumference to the inner circumference of the outlet, further enhancing the gas flow acceleration effect. Corresponding to the first air groove 524, in another embodiment, the middle ring 52 has a second air groove on the side near the front ring 51 (i.e., the front end face of the middle ring 52), which cooperates with the rear end face of the front ring 51 to form a vertically flowing second outlet 542.

[0029] Further reference Figure 3The height of the inner top surface of the boss structure 522 of the middle ring 52 is lower than the height of the radially inner extension of the inclined surface 513. In other words, the inclined surface of the second outlet 542, away from the protective mirror, extends to the inner side closer to the optical path channel. The design of the aforementioned extended surface can further provide a continuous guiding and fitting surface for the protective airflow, avoid flow separation when the airflow flows out, effectively suppress the generation of eddies and turbulence, ensure that the protective gas is ejected in a stable laminar flow state, and extend the axial guiding path of the airflow.

[0030] refer to Figure 7A , Figure 7B and Figure 7C The rear ring 53 is a circular ring with a central through hole. (Reference) Figure 3 and Figure 7B The side view shows that, in some alternative embodiments, the rear ring 53 has the thinnest axial thickness of the three rings to reduce the overall thickness of the entire airflow guide 54. (See reference...) Figure 7A Multiple second locating pins 531 are evenly distributed on the front end face of the rear ring 53 (facing the middle ring 52), used to cooperate with the corresponding first locating holes 515 on the rear end face of the middle ring 52 to achieve axial bearing and circumferential anti-rotation positioning between the middle ring 52 and the rear ring 53. (Reference) Figure 7C The rear end face of the rear ring 53 (facing the protective mirror 26) is a smooth, flat annular plane. This smooth rear end face fits tightly against the inner wall structure of the gun barrel 22 on the front side of the protective mirror 26, providing axial support for the airflow guide 54. Furthermore, the annular groove between the front end face of the rear ring 53 and the rear end face of the middle ring 52 forms an annular gas distribution space communicating with the first gas groove 524. (Reference) Figure 7C The rear end face of the rear ring 53 shown has a wide and smooth inner ring surface defined by the concentric annular stepped flange 532 that can be directly observed in the inner circumferential area of ​​the rear end face. There are no air grooves or openings, ensuring that the protective gas will not leak from the rear end face side toward the protective mirror 26.

[0031] Further describe the formation mechanism and technical effects of the first exit 541. (Reference) Figure 4 , Figure 6C and Figure 7AThe first gas groove 524 on the rear end face of the middle ring 52 extends along the circumferential direction to form an arc-shaped groove on the inner circumferential edge. The bottom surface of the first gas groove 524 is parallel to the reference plane of the rear end face of the middle ring 52. The two arc-shaped ends of the first gas groove 524 define the circumferential angle range of the second outlet 542 in the circumferential direction. After the concentric annular stepped flange 532 on the front end face of the rear ring 53 (facing the middle ring 52) is flatly attached to the rear end face of the middle ring 52, the protective gas flows through the annular gas distribution space between the middle ring 52 and the rear ring 53, and flows around the inner circumferential through-hole area of ​​the middle ring 52 to the rear end face side of the middle ring 52, and enters the first gas groove 524. Because the front end face of the rear ring 53 is directly attached to the rear end face of the middle ring 52, and the rear end face of the middle ring 52 covers the open area of ​​the front end face of the rear ring 53 without forming an independent outlet, the rear end face outlet of the protective gas is defined only by the flat contact surface of the first gas groove 524 and the front end face of the rear ring 53: that is, the bottom surface of the first gas groove 524, the two side walls of the groove, and the front end face of the rear ring 53 together form the first outlet 541. In some optional embodiments, the first gas groove 524 may also be provided on the rear ring 53. (See reference...) Figure 3 As shown, the first outlet 541 is located between the middle ring 52 and the rear ring 53. The outlet cross-section of the first outlet 541 is a narrow slit in the axial section, and the outlet opening direction is perpendicular to the axial direction of the gun barrel 22, i.e., radially. The air outlet direction is perpendicular to the radially inner side of the axis of the optical path channel 23. The first outlet 541 is located in the rear end region of the airflow guide 54 near the protective mirror 26, and is axially adjacent to the protective mirror 26, so that the high-speed airflow ejected through the first outlet 541 expands radially at the axial position in front of the protective mirror 26, forming a transverse high-speed air curtain within the arc-shaped fan area around the circumference of the optical path channel 23. This transverse air curtain continuously and stably cuts off the metal welding slag and dust propagating in the reverse direction from the nozzle 21 at the inner wall 221 of the gun barrel, preventing them from reaching the surface of the protective mirror 26, thereby effectively protecting the protective mirror 26 from contamination. Therefore, it significantly extends the effective service life of the protective mirror 26 and reduces replacement costs.

[0032] Specifically, the central angle corresponding to the circumferential expansion of the first outlet 541 is α. In some optional embodiments, the central angle α corresponding to the first air groove 524 satisfies 90°≤α≤120°. By setting α within the above range, the first outlet 541 outputs a transverse air curtain in the circumferential direction in a wide arc-shaped fan, fully covering the entire contaminated hazardous area at the leading edge of the protective mirror 26, preventing welding fumes and spatter from reaching the surface of the protective mirror 26 from any arc segment position in the circumferential direction. Since the flow cross-sectional area of ​​the first outlet 541 is significantly reduced compared to the cross-sectional area of ​​the main gas channel 25 and the annular gas distribution space of the rear ring 53, the protective airflow undergoes a throttling effect when passing through the first outlet 541, and the airflow velocity is greatly increased, transforming into a high-speed jet airflow, thereby maintaining the blocking capability of the air curtain with sufficient dynamic pressure.

[0033] Furthermore, in some optional embodiments, the axial distance between the first outlet 541 and the surface of the protective mirror 26 is 4mm to 10mm to ensure that the air curtain still has sufficient speed and coverage when it reaches the leading edge of the protective mirror.

[0034] refer to Figure 4 , 5B and Figure 6B The formation mechanism of the second outlet 542 is as follows: The inclined opening defined by the inclined surface 513 of the rear end face of the front ring 51 and the sunken step 514 faces axially forward (i.e., towards the nozzle). The protruding boss on the front end face of the middle ring 52 and the inclined surface 513 of the rear end face of the front ring 51 maintain a controlled gap in the axial direction. This gap forms the inlet section of the flow channel of the second outlet 542. After the protective gas flows through the annular gas distribution space of the rear ring 53, it flows around the front side of the inner circumferential wall of the middle ring 52 and enters the inclined channel defined by the inclined surface 513 of the rear end face of the front ring 51. It is throttled and accelerated through the narrow slit section of the second outlet 542 and ejected at an angle inclined towards the nozzle 21 under the guiding effect of the inclined surface 513 of the front ring 51. The outlet direction of the second outlet 542 is inclined at an angle to the axis of the gun barrel 22 due to the inclined angle defined by the inclined surface 513, and the outlet direction is inclined towards axially forward (i.e., towards the nozzle 21). The accelerated jet ejected from the second outlet 542 continues to accelerate forward along the axial direction under the guidance and constraint of the inner wall 221 of the gun barrel, forming a high-speed protective jet covering the weld pool at the nozzle 21 outlet. This jet quickly isolates the weld pool from the surrounding atmosphere, preventing oxidation. Thus, under the same total gas input conditions, it significantly enhances the local airflow velocity and protective effect at the weld pool, effectively reducing the cost of protective gas consumption. The central angle corresponding to the circumferential expansion of the second outlet 542 is β, where β satisfies 65°≤β≤75° and β is less than α. By setting β to a value less than α, the second outlet 542 forms a more concentrated fan-shaped accelerated jet with a smaller central angle, concentrating the airflow energy in a narrower circumferential fan area, further increasing the local dynamic pressure intensity in this direction, and enhancing the coverage and suppression capability of the weld pool protective jet on the welding area. Therefore, the above-mentioned range of values ​​for α and β and their magnitude relationship achieve optimized gas volume distribution between the wide coverage of the anti-fouling gas curtain and the high intensity of the protective jet for the molten pool under the condition of fixed total gas volume input. This allows the protective functions of the two airflows to be fully utilized, and correspondingly avoids the gas waste problem caused by simply increasing the protective gas flow rate.

[0035] Please refer to the above. Figure 8In some optional embodiments, the outflow direction of the second outlet 542 is set to be perpendicular to the axis of the optical path channel 23. Specifically, the second outlet 542 that achieves vertical outflow is formed by the following structure: the middle ring 52 is provided with a second air groove (not shown in the figure) on the side near the front ring 51 (i.e., the front end face of the middle ring 52). The second air groove extends in the circumferential direction, and its shape is similar to or the same as the first air groove 524 on the rear end face of the middle ring 52. When the front ring 51 and the middle ring 52 are axially stacked, the second air groove on the middle ring 52 and the rear end face of the front ring 51 together form the second outlet 542. In this embodiment, the rear end face of the front ring 51 is preferably a flat annular plane (i.e., without the aforementioned inclined surface 513), or a flat mating surface that matches the second air groove. The protective gas from the distribution chamber is throttled and accelerated by the second air groove on the middle ring 52, and then ejected in a radial direction perpendicular to the axis of the optical path channel 23, forming a transverse protective gas flow. The transverse airflow can act independently or in conjunction with the transverse air curtain generated by the first outlet 541 to form multiple protective air curtains at multiple locations within the optical path channel 23 between the protective mirror 26 and the nozzle 21, further enhancing the protection of the optical components. The vertically positioned second outlet 542 can form a second transverse air curtain independent of the first outlet 541 within the optical path channel 23, achieving dual protection and significantly improving the anti-contamination reliability of the protective mirror 26. At the same time, its outflow does not contain an axial component, avoiding interference with the molten pool protection jet, and its simpler structure helps reduce processing costs and ensure consistent airflow distribution.

[0036] Furthermore, in some optional embodiments, the flow cross-sectional area (i.e., the opening size in the radial section) of the first outlet 541 is equal to that of the second outlet 542. The flow cross-sectional areas of the two outlets, under the same main gas channel 25 gas source pressure, ensure that the velocity magnitudes of the two throttling gas flows remain at a comparable level, achieving a stable and predictable flow distribution and avoiding the imbalance problem where one outlet has an excessively small cross-section leading to overly concentrated flow while the other has insufficient flow.

[0037] In some optional embodiments, the arc-shaped expansion areas of the first outlet 541 and the arc-shaped expansion areas of the second outlet 542 are set at different non-overlapping circumferential fan-shaped positions in the circumferential direction. That is, the central angle α range corresponding to the first outlet 541 and the central angle β range corresponding to the second outlet 542 are staggered in the circumferential direction, so that the transverse gas curtain coverage area and the accelerated protective jet coverage area act on different circumferential azimuth angle ranges of the optical path channel 23 axis, respectively. Since the protective gas from the main gas channel 25 is evenly distributed along the entire circumferential direction through the distribution cavity, it flows independently into the first outlet 541 and the second outlet 542 of their respective circumferential fan-shaped areas. The two airflows do not merge in the same circumferential fan-shaped area before entering their respective outlets, thereby avoiding the situation where the two airflows overlap in the same circumferential fan-shaped area, resulting in excessively high local pressure or turbulent airflow direction. This allows the transverse gas curtain and the molten pool protective jet to be stably established in their respective circumferential areas, further improving the controllability of the overall airflow field and the independence of the protective functions of the two airflows.

[0038] Furthermore, the cross-sectional area of ​​the first outlet 541 and the second outlet 542 is 10%-16% of the cross-sectional area of ​​the main gas channel. Adjusting the diameter ratio of the first outlet and the second outlet can control the gas flow rate, allowing the protective gas to achieve a significant acceleration effect when flowing through the outlet, while maintaining a reasonable throttling pressure drop and avoiding overload of the gas supply system.

[0039] Furthermore, in some optional embodiments, the outlet direction of the second outlet 542 forms an angle of 30° to 50° with the axis of the gun rod. The accelerated airflow generated by the second outlet 542 flows along the gun rod 22 to the nozzle 21, forming a protective gas jet with a high flow rate at the nozzle 21, which can quickly cover the weld pool area, provide sufficient anti-oxidation protection, and improve the weld formation quality.

[0040] refer to Figure 6A , Figure 6B and Figure 7AThe circumferential anti-rotation positioning between the front ring 51, middle ring 52, and rear ring 53 is achieved through the insertion and engagement of positioning pins and positioning holes on their respective end faces. The second positioning hole 523 on the rear end face of the front ring 51 engages with the first positioning pin 521 on the front end face of the middle ring 52, locking the front ring 51 and middle ring 52 together circumferentially after axial stacking. This ensures a predetermined fixed relationship between the circumferential position of the arc-shaped opening of the first air groove 524 and the circumferential position of the boss structure on the front end face of the middle ring 52, thereby ensuring the stable relative position of the first outlet 541 and the second outlet 542 in the circumferential direction. The second positioning hole 523 on the rear end face of the middle ring 52 and the corresponding second positioning pin 531 on the front end face of the rear ring 53 achieve axial bearing fixation and circumferential anti-rotation positioning between the middle ring 52 and the rear ring 53, ensuring that the geometry of each outlet of the entire airflow guide 54 remains stable under working vibration conditions. The above-mentioned fixing scheme for positioning holes and positioning pins is not the only option. Other connection methods such as magnetic attraction and snap-fit ​​can also be selected. The setting position of positioning holes and positioning pins is not limited and can be located in any one or more of the front ring 51, middle ring 52 and rear ring 53.

[0041] refer to Figure 3 After assembling the front ring 51, middle ring 52, and rear ring 53 into an integrated airflow guide 54, the multiple ear-shaped positioning protrusions 511 on the outer circumference of the front ring 51 cooperate with the corresponding positioning grooves on the inner wall 221 of the gun barrel to reliably lock the airflow guide 54 in a predetermined axial position within the gun barrel 22. Simultaneously, this restricts the circumferential rotation of the airflow guide 54 within the gun body 24, ensuring that the orientations of the first outlet 541 and the second outlet 542 maintain a predetermined correspondence with the air intake direction of the main gas channel 25 in the assembled state. This modular, split-layer stacking structure and snap-fit ​​fixing method allow the airflow guide 54 to be quickly disassembled or replaced as a whole without disassembling the remaining components of the gun body 24. This adapts to the varying requirements of different welding processes for airflow distribution parameters, further enhancing the overall maintenance convenience and process adaptability of the handheld laser welding device.

[0042] refer to Figure 3Based on the above description of the structure of each ring component, the complete gas flow path of the airflow guide 54 in the working state is as follows: After the protective gas enters the annular space between the inner wall 221 of the gun barrel and the outer circumference of the airflow guide 54 through the main gas channel 25, the gas pressure is evenly distributed throughout the entire circumferential direction. The protective gas then fills the distribution cavity along at least a partial circumferential direction through the annular gas distribution space formed between the concentric annular stepped flange 532 of the rear ring 53 and the rear end face of the middle ring 52. It then splits into two paths: one path of protective gas flows through the circumferential through-hole area of ​​the middle ring 52 to the front end face of the rear ring 53, flows into the first gas groove 524, is accelerated by the throttling effect of the arc-shaped cross section of the first gas groove 524, and is ejected at high speed in the vertical radial direction through the first outlet 541, forming a transverse high-speed air curtain in front of the protective mirror 26; the other path of protective gas flows along the gap between the front end face boss of the middle ring 52 and the sunken step 514 of the rear end face of the front ring 51, is accelerated by the guide of the inclined surface 513 of the front ring 51 and the throttling of the second outlet 542, and is ejected in an inclined direction towards the front of the nozzle 21. Under the guidance of the inner wall 221 of the gun barrel, it forms a forward-accelerating protective jet and covers the weld pool at the nozzle 21. Therefore, the airflow guiding mechanism 50 distributes the single protective gas input into two coordinated outputs—an anti-fouling gas curtain and a molten pool protection jet—through the airflow guiding component 54. This significantly enhances the anti-fouling capability inside the gun barrel 22 and the oxidation protection effect of the welding molten pool while controlling the total gas consumption.

[0043] In some optional embodiments, the airflow guide 54 is designed as a one-piece annular part. Optionally, the first outlet 541 and the second outlet 542 are integrally formed inside the annular part using an additive manufacturing process. The outlet direction of the first outlet 541 is perpendicular to the axial direction of the gun barrel 22 and expands in the circumferential direction at a central angle α, corresponding to the aforementioned function and air outlet direction of the first outlet 541; the outlet direction of the second outlet 542 is inclined towards the front of the nozzle 21 and expands in the circumferential direction at a central angle β. This one-piece annular part eliminates the need to assemble the front ring 51, middle ring 52, and rear ring 53 separately, eliminating assembly errors at the joints of the rings and potential leakage paths along the joints. This results in higher flow channel geometric accuracy for the first outlet 541 and the second outlet 542, more stable airflow guidance, and further improved mechanical reliability of the one-piece structure under welding gun vibration and high-temperature conditions.

[0044] In some optional embodiments, at least one of the first outlet 541 and the second outlet 542 can be replaced by a plurality of discrete micro-holes instead of continuous arc-shaped slots. The plurality of discrete micro-holes are arranged at equal intervals along the corresponding central angle direction in the circumferential direction, and the sum of the cross-sectional areas of each discrete micro-hole is equivalent to the outlet area of ​​the corresponding continuous arc-shaped slot. Thus, while maintaining the same throttling and acceleration effect, multiple parallel high-speed fine jets are ejected in the form of a discrete micro-hole array. Compared to the continuous sheet-like air curtain formed by continuous arc-shaped slots, each fine jet in the micro-hole array has a higher axial dynamic pressure holding distance, which can further enhance the dynamic pressure strength of the air curtain at a specific axial position in front of the protective mirror 26, and strengthen the air curtain's ability to resist the penetration of high-speed splashes.

[0045] refer to Figure 1 , Figure 2 and Figure 9 The handheld welding torch 20 of this application further includes at least one protective lens quick-release module 30 and at least one locking component 40. Figure 9 As shown in the dashed box, the quick-release module 30 for the protective lens and the locking component 40 are integrated in the central area of ​​the gun body 24. The gun handle 22 extends axially forward from the gun body 24 and connects to the nozzle 21. The armor cable 60 extends axially rearward from the gun body 24. The protective lens 26 in the quick-release module 30 is mounted on the optical path channel 23 to isolate dust, fumes, and spatter generated during welding while the laser beam passes through. It is a key optical component in the handheld welding gun 20 that requires regular maintenance and replacement. The handheld welding gun 20 has an internal optical path channel extending along a first direction.

[0046] refer to Figure 10 and Figure 11The gun body 24 has an internal mounting cavity 242, and a pop-out opening 241 communicating with the mounting cavity 242 is provided on the side of the gun body 24. The protective lens quick-release module 30 includes a lens fixing drawer 31 for carrying the protective lens 26. The lens fixing drawer 31 is configured to reciprocate between the mounting cavity 242 and the pop-out opening 241 in a second direction, that is, the pop-out direction of the lens fixing drawer 31 is the second direction. The second direction is perpendicular to the first direction. The protective lens 26 is provided with multiple symbols to indicate the number of rotations of the protective lens 26 or a specific usage state. The lens fixing drawer 31 is provided with a protective lens viewing window 313. When the lens fixing drawer 31 is in the mounting position in the mounting cavity 242, the protective lens viewing window 313 exposes the symbols provided on the surface of the protective lens in a third direction. The locking component 40 is provided on the gun body 24 and includes a push block 41 exposed on the surface of the gun body 24. The push block 41 is configured to slide in a direction parallel to the first direction. By pre-setting a transparent area on the gun body 24 or other areas corresponding to a third direction, the operator can intuitively and quickly read the symbol information on the lens from the transparent area on the gun body or other areas corresponding to a third direction without having to pull out the lens fixing drawer. This facilitates the immediate confirmation of the protective goggle's usage status, improving operational safety and maintenance efficiency. Simultaneously, in conjunction with a quick-release module that pulls out along the second direction, the inspection and replacement of the protective lens becomes more efficient and reliable. Furthermore, the transparent area can be located on the lens fixing drawer 31.

[0047] In some optional embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0048] The protective lens quick-release module 30 also includes at least one guide member 32, which is disposed on the gun body 24 along a second direction perpendicular to the first direction and has one end movably resting against the lens fixing drawer 31. The guide member 32 further includes an elastic element (not shown in the figure), which is configured to release elastic potential energy and drive the guide member 32 to automatically pop out of the lens fixing drawer toward the pop-out opening at the moment the locking member is released.

[0049] When the push block 41 slides along the first direction under force, the locking component 40 releases the lock on the lens fixing drawer 31. The lens fixing drawer 31 can automatically pop out and be completely removed under the drive of at least one guide component 32, realizing quick one-handed replacement of the protective goggles, significantly improving the convenience of maintenance operations and reducing replacement time costs. The sliding direction of the push block 41 and the pop-out direction of the lens fixing drawer 31 are independent and orthogonal to each other, ensuring that the axial and lateral forces applied to the gun body during normal welding and holding operations are unlikely to trigger mis-locking, thus guaranteeing safety in use.

[0050] In some optional embodiments, the air inlet of the main gas channel 25 is located on the opposite side of the gun body 24, opposite to the ejection opening 241. That is, the main gas channel 25 is connected to the gun body 24 from the armor cable 60 on one side, and the air inlet of the main gas channel 25 and the ejection opening 241 are located on opposite sides of the gun body 24 in a second direction. Since no air pipe interface is provided on the outer surface of the gun body 24 on the ejection opening 241 side, when the operator performs the protective goggle 26 replacement operation, the outer surface on the ejection side remains an open area without pipe obstruction. After the lens fixing drawer 31 ejects in the second direction, it is not interfered with by the air pipe, and the operator can complete the removal and insertion of the lens fixing drawer 31 with one hand, thereby improving the convenience of maintenance operations. At the same time, the arrangement of the air inlet of the main gas channel 25 and the ejection opening 241 on opposite sides of the gun body 24 makes the structural load on both sides of the gun body 24 more symmetrical, which helps improve the operator's center of gravity balance when holding the gun and reduces hand fatigue during long welding operations.

[0051] refer to Figure 11 , Figure 11 The overall assembly state of the protective lens quick-release module 30 and the locking component 40 is shown. The lens fixing drawer 31 is configured as a frame structure, further including a central region 312 and side walls 311. The protective lens 26 is fixedly supported in the central region 312 of the lens fixing drawer 31. The guide component 32 further includes a sleeve 33 with one end fixedly connected to the inner wall of the gun body, and a guide rod 34 slidably engaged in the inner cavity of the sleeve 33. The axis of the sleeve 33 extends along a second direction, and one end of the guide rod 34 extends out of the sleeve and rests against the outer surface of the lens fixing drawer 31. An elastic element is pre-compressed between the bottom of the inner cavity of the sleeve 33 and the end of the guide rod 34 that extends into the sleeve, so as to continuously apply an elastic thrust along the second direction and toward the pop-out opening 241 to the guide rod 34 and the lens fixing drawer 31. Furthermore, the engagement length of the guide rod 34 and the sleeve 33 along the second direction is configured such that when the lens fixing drawer is ejected under the drive of the elastic member but has not completely detached from the mounting cavity, the guide rod 34 extends along the second direction with the lens fixing drawer 31, i.e., the guide rod 34 is not completely detached from the sleeve. In some optional embodiments, the engagement length of the guide rod 34 and the sleeve 33 along the second direction can also be configured such that when the lens fixing drawer 31 is ejected under the drive of the elastic member to completely detach from the mounting cavity, the guide rod 34 completely retracts along the second direction and detaches from the sleeve 33. It should be particularly noted that in this embodiment, the engagement method of the guide rod 34 and the sleeve 33 allows the lens fixing drawer 31 to slide completely out along the second direction and detach from the sleeve 33 after unlocking, thereby achieving complete removal of the lens fixing drawer 31. After the lens fixing drawer 31 is completely removed, the elastic member returns to its natural extended state.

[0052] refer to Figure 10 , Figure 10The diagram shows the state where the push block 41 is released from its locking position after being pushed in the first direction, and the lens fixing drawer 31 pops out in the second direction under the drive of the elastic element. At this time, the guide rod 34 exits the sleeve 33 along with the lens fixing drawer 31 in the second direction, and the entire lens fixing drawer 31 pops out from the pop-out opening 241. The protective lens 26 moves out of the mounting cavity 242 along with the lens fixing drawer 31, and the operator can remove the lens fixing drawer 31 and replace the protective lens 26.

[0053] refer to Figure 12 , Figure 12 The image shows the state after the lens fixing drawer 31 has been completely removed from the gun body 24. At this point, the lens fixing drawer 31 is completely detached from the gun body 24, and the ejection opening 241 of the gun body 24 is fully open. (Comparison) Figure 10 and Figure 12 As can be seen, the lens fixing drawer 31 in this embodiment is designed to be completely removable. This design allows operators to complete the replacement of the protective goggles 26 in a clean environment away from the welding site, reducing the risk of secondary contamination. At the same time, it allows for convenient and complete removal and placement of the lens fixing drawer 31, facilitating the replacement operation.

[0054] The following text will describe in detail the internal structure of the protective lens quick-release module 30 and the locking component 40, the spatial relationship between the components, and their working principle.

[0055] refer to Figure 13 , Figure 13 The structural details of the lens holding drawer 31 and the push block 41 are shown separately in an exploded view. The central region 312 of the lens holding drawer 31 has a through-hole for receiving the protective lens 26. A guide rod 34 is located outside the central region 312 of the lens holding drawer 31 and extends in a second direction. (Reference) Figure 13 In the middle, the push block 41 is a block shape adapted to the side of the gun body 24. A locking part 42 is provided on the inner side of the push block 41, and two locking pins 43 are arranged at intervals on the locking part 42. Both locking pins 43 extend along the first direction. A locking hole 315 is provided on the side wall 311 of the lens fixing drawer 31. The locking hole opens along the first direction and faces the side where the locking pins 43 are located, so that the locking pins 43 can be inserted into or disengaged from the locking hole 315 along the first direction.

[0056] After the locking pin 43 is inserted into the lock hole 315 in the first direction, the outer wall surface of the locking pin 43 and the inner wall surface of the lock hole 315 form a contact surface that abuts against each other in the second direction. The elastic force exerted by the elastic member on the lens fixing drawer 31 in the second direction by this contact surface in the second direction locks the lens fixing drawer 31 in the installation position. The unlocking action only requires pulling the locking pin 43 out of the lock hole 315 in the first direction. During the unlocking process, the locking pin 43 does not exert any third-direction force on the lens fixing drawer 31. Therefore, the unlocking action itself will not drive the lens fixing drawer 31 to move. Only at the instant the lock is released does the elastic member's pop-out force act on the lens fixing drawer 31, achieving controlled instantaneous pop-out.

[0057] refer to Figure 11 A locking component 40 is disposed on the side of the gun body 24, adjacent to the side wall 311 of the lens fixing drawer 31 along the axial direction. A push block 41 is exposed on the side of the gun body 24, its sliding operation direction being a first direction, i.e., parallel to the axial direction of the optical path channel 23. A locking part 42 is fixedly connected to the push block 41 and faces the first direction. A locking pin 43 is disposed on the locking part 42, configured to engage with a locking hole 315 on the side wall of the lens fixing drawer 31 along the first direction. A reset elastic element 44 is also provided on the locking component 40 to provide a reset elastic force. The reset elastic element 44 is disposed on the axial front side of the push block 41. Figure 11 It is in the form of a helical spring. One end of the reset elastic element 44 abuts against the rear end face of the push block 41, and the other end abuts against the corresponding stop face of the inner wall of the gun body 24, continuously applying a reset elastic force to the push block 41 in the first direction toward the axial front.

[0058] refer to Figure 14 , Figure 14 A magnified cross-sectional view shows the details of the locked state of the protective lens quick-release module 30 and the locking component 40 inside the gun body 24. Figure 13 In the locked state shown, the lens fixing drawer 31 is accommodated within the mounting cavity 242, the protective lens 26 is in the working position of the optical path channel 23, and the guide rod 34 extends into the sleeve 33, compressing the elastic element to a stored state. The push block 41 is in the axially forward reset position, and the locking pin 43 is inserted into the locking hole 315 along the first direction. Both locking pins 43 simultaneously engage with the corresponding two locking holes 315, forming a reliable two-point mechanical lock on the lens fixing drawer 31 in the first direction. The reset elastic element 44 is in a slightly compressed state, continuously maintaining the push block 41 and the locking pin 43 in the axially forward locked position.

[0059] Based on the above structure, the complete working process of unlocking, ejecting, and resetting will be described in detail. In the initial locked state, the operator, through a pre-set transparent area facing upwards, sees the symbol corresponding to the protective mirror 26 inside the protective mirror window 313 and confirms that the protective mirror 26 needs to be replaced. Then, with one hand, the operator pushes the push block 41 axially backwards in the first direction. The push block 41 overcomes the elastic force of the reset elastic element 44 and moves axially backwards. The locking part 42 and the two locking pins 43 move axially backwards synchronously with the push block 41. The locking pins 43 disengage from the lock hole 315 along the first direction. Figure 10 As shown. At the instant the locking pin 43 disengages, the mechanical constraint on the lens fixing drawer 31 in the second direction is released. The elastic potential energy stored in the elastic element drives the guide rod 34 and the lens fixing drawer 31 to move outward in the second direction. The lens fixing drawer 31 pops out of the mounting cavity 242 and continues to slide outward in the second direction until the guide rod 34 is at least partially removed from the sleeve 33, and the lens fixing drawer 31 is completely removed. Figure 12 As shown. The operator can release the push block 41, and the reset elastic element 44 drives the push block 41 and the locking pin 43 to return to their initial positions along the axial direction of the first direction. After the operator removes the lens fixing drawer 31, the old protective lens 26 is taken out and a replacement protective lens 26 is placed in it. Then, the lens fixing drawer 31 carrying the new protective lens 26 is pushed from the pop-out opening 241 into the mounting cavity 242 in the opposite direction of the second direction. During the pushing process, the guide rod 34 re-enters the sleeve 33 and compresses the elastic element. When the lens fixing drawer 31 reaches the mounting position, the locking hole 315 and the locking pin 43 are re-aligned in the first direction. The locking pin 43, which is in the reset position under the drive of the reset elastic element 44, automatically inserts into the locking hole 315, completing the automatic locking. The handheld welding torch 20 returns to the normal locking state.

[0060] The above design has the following advantages: First, through the protective goggle window 313, the symbol information on the lens can be read intuitively and quickly without pulling out the lens fixing drawer 31, facilitating the confirmation of the protective goggle's usage status at any time, improving operational safety and maintenance efficiency. Second, when the handheld welding torch 20 is in normal use, the main forces applied by the operator to the torch body 24 along the welding direction are the axial pushing and pulling force along the first direction and the lateral supporting force along the second direction. When the axial force along the first direction acts on the push block 41, since the reset elastic element 44 always provides a reset force along the axial forward direction, the operator will not apply a continuous axial rearward pushing force to the push block 41 when holding it normally, thus preventing false locking. When the lateral force along the second direction acts on the torch body 24, the direction of this force is orthogonal to the sliding direction of the push block 41 in the first direction, making it less likely to trigger false locking. Third, the design of the lens fixing drawer 31 being completely removed along the second direction makes it easier for the operator to replace the protective goggle 26 and then reinstall it in the torch body 24. Fourth, the axial translation unlocking action of the push block 41 in the first direction and the pop-out action of the lens fixing drawer 31 in the second direction are independent of each other. After the operator pushes the push block 41 to trigger the unlocking, the push block 41 can be released immediately without having to hold the push block 41 continuously. The operator has a high degree of freedom of operation with both hands, which improves the convenience of operation in actual use.

[0061] In some optional embodiments, the ejection method of the lens fixing drawer 31 can be replaced by automatic ejection driven by an elastic element, or purely manual removal. That is, the elastic element is omitted, and the operator can directly hook the lens fixing drawer 31 out with their finger after the push block 41 is unlocked. In this variant, the guide rod 34 is integrated with the lens fixing drawer 31. The sliding cooperation between the sleeve 33 and the guide rod 34 is only used to provide directional guidance for the removal and pushing of the lens fixing drawer 31, preventing the lens fixing drawer 31 from deflecting during removal or pushing and damaging the protective lens 26. The structure and working principle of the locking component 40 remain unchanged.

[0062] In some optional embodiments, the number of locking pins 43 is not limited to two. One locking pin 43 can be used with one locking hole 315 to simplify the machining complexity of the locking part 42; alternatively, three or more locking pins 43 can be used to further improve the uniformity and reliability of locking. In the case of only one locking pin 43, an anti-rotation positioning structure can be added to the mating surface of the locking pin 43 and the locking hole 315 to compensate for the possible rotational tendency of the lens fixing drawer 31 around a third direction during single-point locking, ensuring the optical center accuracy of the protective lens 26.

[0063] In some optional embodiments, the sliding operation direction of the push block 41 is not limited to the axial direction that is strictly parallel to the first direction. It can be set at a certain tilt angle relative to the first direction in the plane formed by the first direction and the second direction. As long as the projection component of the operation direction in the third direction is small enough and will not exert an effective lateral force on the lens fixing drawer 31 that affects its pop-out trajectory during the unlocking process, this variant can still achieve the same technical effect as this embodiment. At the same time, the operation direction of the push block 41 can be adjusted and optimized in accordance with the shape of the gun body 24 and the hand grip habits of the user.

[0064] In some optional embodiments, the elastic element and the reset elastic element 44 can each be in the form of elastic elements other than helical springs, such as leaf springs, disc springs, or elastic rubber bodies, to adapt to the spatial constraints in different directions inside the gun body 24. The elastic stiffness and pre-compression of the elastic element are configured so that the lens fixing drawer 31 can pop out to a distance sufficient for the operator to take out the protective lens 26 with one hand after unlocking; the elastic stiffness of the reset elastic element 44 is configured so that after the operator releases the push block 41, it can reliably drive the push block 41 back to the reset position where the locking pin 43 and the locking hole 315 are axially aligned, while the elastic force is not so large that it is difficult for the operator to push the push block 41, thereby achieving a balance between ease of operation and locking reliability.

[0065] In some optional embodiments, the number of guide rods 34 is not limited to one. Two or more guide rods 34 can be set at different positions of the lens fixing drawer 31 and slide in the corresponding multiple sleeves 33 respectively. Through multi-point guidance, the directional stability of the lens fixing drawer 31 during pop-out and push-in processes is further improved, preventing slight rotation and deflection of the lens fixing drawer 31 that may occur under a single guide rod 34 configuration, and ensuring that the optical center of the protective lens 26 is always precisely aligned with the axis of the optical path channel 23 when it is installed.

[0066] In some optional embodiments, the end of the guide rod 34 that extends into the sleeve 33 is formed with an anti-detachment limiting structure (not shown in the figure). The anti-detachment limiting structure can be implemented in various forms such as a radial flange, a pin, a snap ring in a snap ring groove, or a threaded nut provided at the end of the guide rod 34. As long as its radial dimension is greater than the inner diameter of the opening of the sleeve 33 and can reliably abut against the end of the sleeve 33, the anti-detachment function can be achieved. The specific form can be selected according to the material and processing technology of the guide rod 34.

[0067] In some optional embodiments, the axial sliding engagement of the push block 41 can be achieved by providing an axial groove on the gun body 24 that engages with the push block 41. The push block 41 slides within the axial groove, which provides a guiding constraint for the axial translation of the push block 41 and prevents the push block 41 from displacing or rotating in the direction perpendicular to the axial direction. This further ensures the axial alignment accuracy of the locking pin 43 relative to the locking hole 315, enabling the locking pin 43 to be accurately reinserted into the locking hole 315 when reset under the drive of the reset elastic element 44, thus achieving reliable automatic locking.

[0068] Furthermore, in some alternative embodiments, a protective eye window 313 is provided in the central area 312 of the lens fixing drawer 31 along a third direction perpendicular to the first direction. The protective eye window 313 is used to expose and display the symbol located on the protective eye 26.

[0069] In some optional embodiments, the protective goggle 26 is eccentrically positioned in the central region 312 of the lens fixing drawer 31. In some optional embodiments, the central region 312 further includes an adjustment region 314, to which at least a portion of the outer edge of the protective goggle 26 is exposed. Further, at least one adjustment mechanism (not shown) is provided on the gun body 24 and movably connected to the protective goggle 26 via the adjustment region 314, for adjusting the circumferential rotation of the protective goggle 26. This eccentric and adjustment design allows for adjustment of the effective optical area of ​​the protective goggle 26, facilitating continued use of the goggle 26 even when it is contaminated, thus extending its service life and reducing the number of times it needs to be used. The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A handheld welding torch, wherein an optical path channel extending along a first direction is provided internally, characterized in that, include: The gun body has an internal mounting cavity, and the side of the gun body has a pop-out opening that communicates with the mounting cavity; as well as A quick-release module for protective lenses includes a lens holding drawer for carrying protective lenses, the lens holding drawer being configured to reciprocate between the mounting cavity and the pop-out opening along a second direction perpendicular to the first direction; The lens fixing drawer is provided with a protective lens window. When the lens fixing drawer is in the installation position in the mounting cavity, the protective lens window exposes the symbols set on the surface of the protective lens along a third direction.

2. The handheld welding torch according to claim 1, characterized in that, The handheld welding torch further includes a locking component disposed on the torch body, the locking component including a push block exposed on the surface of the torch body; wherein the push block is configured to slide parallel to the first direction; when the push block is subjected to force and slides along the first direction, the locking component releases the lock on the lens fixing drawer, allowing the lens fixing drawer to move out toward the pop-out opening direction.

3. The handheld welding torch according to claim 2, characterized in that, The protective lens quick-release module further includes: at least one guide component, which is disposed on the gun body along the second direction and one end is movably supported on the lens fixing drawer.

4. The handheld welding torch according to claim 3, characterized in that, The guide component further includes an elastic element, which is configured to release elastic potential energy and drive the guide component to automatically pop out of the lens fixing drawer toward the pop-out opening at the moment the locking component is released.

5. The handheld welding torch according to claim 4, characterized in that, The lens fixing drawer further includes at least a central region and at least one side wall, the protective lens is fixedly supported in the central region, and a lock hole is provided on the side wall opening along the first direction; the locking component further includes a locking part fixedly connected to the inner side of the push block, and at least one locking pin disposed on the locking part and extending along the first direction; the locking pin is configured to translate along the first direction with the push block to insert into the lock hole along the first direction to achieve mechanical locking of the lens fixing drawer, or to disengage from the lock hole to release the locking.

6. The handheld welding torch according to claim 5, characterized in that, The handheld welding torch has a barrel extending from its front end and a nozzle connected to it. The locking component further includes a reset elastic element. One end of the reset elastic element abuts against the rearward-facing end face of the push block, and the other end abuts against the corresponding stop face on the inner wall of the torch body. The reset elastic element is configured to continuously apply a reset elastic force along the first direction and axially forward to the push block, so that the locking pin is maintained in the locking position inserted into the lock hole.

7. The handheld welding torch according to claim 4, characterized in that, The guide component further includes a sleeve with one end fixedly connected to the inner wall of the gun body, and a guide rod slidably fitted in the inner cavity of the sleeve, the axis of the sleeve extending along the second direction; one end of the guide rod extends out of the sleeve and rests against the outer surface of the lens fixing drawer; the elastic element is pre-compressed and disposed between the bottom of the inner cavity of the sleeve and the end of the guide rod extending into the sleeve, so as to continuously apply an elastic thrust along the second direction and toward the pop-out opening to the guide rod and the lens fixing drawer.

8. The handheld welding torch according to claim 7, characterized in that, The engagement length of the guide rod and the sleeve along the second direction is configured such that when the lens fixing drawer moves outward from the pop-up opening under the drive of the elastic element until it pops out of the mounting cavity, the guide rod at least partially exits along the second direction and disengages from the sleeve.

9. The handheld welding torch according to claim 7, characterized in that, The guide rod has an anti-detachment limiting structure formed at one end that extends into the sleeve. The radial dimension of the anti-detachment limiting structure is larger than the inner diameter of the end opening of the sleeve. It is configured to abut against the end opening of the sleeve when the lens fixing drawer moves outward in the second direction to a predetermined position, so as to prevent the guide rod from detaching from the sleeve.

10. The handheld welding torch according to claim 7, characterized in that, The number of guide components is two or more, and the corresponding sleeves and guide rods are arranged at intervals inside the gun body in a direction parallel to the optical path channel, so as to limit the rotational deflection of the lens fixing drawer when it reciprocates in the second direction through multi-point guidance.

11. The handheld welding torch according to claim 5, characterized in that, There are two locking pins, which are spaced apart on the locking part; there are two corresponding locking holes, which are opened on the side wall of the lens fixing drawer; when the push block is in the locking position, the two locking pins are respectively inserted into the two corresponding locking holes, forming a double-point mechanical lock on the lens fixing drawer in the first direction.

12. The handheld welding torch according to claim 2, characterized in that, An axial groove is recessed on the side of the gun body along the first direction. The push block is fitted and slidably engaged in the axial groove. The sidewall of the axial groove is configured to provide guiding constraints for the translation of the push block along the first direction and to restrict the push block from displacement or rotation in other directions perpendicular to the first direction.

13. The handheld welding torch according to claim 2, characterized in that, The sliding direction of the push block along the first direction has an inclination angle relative to a baseline that is strictly parallel to the first direction in a plane formed by the first direction and the moving direction of the lens fixing drawer, and the projection component of the inclination angle toward the moving direction perpendicular to the lens fixing drawer is insufficient to drive the lens fixing drawer to move.

14. The handheld welding torch according to claim 5, characterized in that, The protective lens is eccentrically positioned within the central region; the central region further has an adjustment area opening at the edge, with at least a portion of the outer edge of the protective lens exposed within the adjustment area; the gun body is provided with an adjustment mechanism passing through the gun body housing, the adjustment mechanism being movably connected to the outer edge of the protective lens via the adjustment area, and configured to drive the protective lens to rotate around a circumference to adjust the effective optical area.

15. A handheld laser welding device, characterized in that, include: Handheld welding torch as described in any one of claims 1 to 14; And the host.

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