An intelligent handheld air-cooled laser welding head

Abstract

The present invention relates to the technical field of laser welding, and discloses an intelligent handheld air-cooled laser welding head. Through the design of the cooling component, the outer wall of the cooling air cylinder is provided with spiral threads, and the air pipe joint introduces external gas into the spiral air path between the cooling air cylinder and the welding gun housing, increasing the contact area between the cold air and the gun body, thereby improving the cooling efficiency of welding; through the design of installing a flue gas recovery component on the gun head, the flue gas generated during welding is effectively recovered, reducing the harm of harmful flue gas to the human respiratory system. A smoke inlet pipe that can adjust the angle according to the welding angle and welding environment is installed at the front end of the flue gas recovery cylinder to ensure the effective extraction of welding flue gas; a replaceable filtering mechanism is placed inside the flue gas recovery cylinder, and it is convenient to replace multiple filter elements in the filtering mechanism in a timely manner, avoiding the reduction of the filtering effect due to the long-term use of the filter elements.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and particularly to an intelligent handheld air-cooled laser welding head. Background Technique

[0002] Laser welding is an efficient and precise welding method that uses a laser beam with a high energy density as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. It utilizes the interaction between the laser beam and the material, and through the heating effect of the laser beam, the material is melted to form a weld.

[0003] After retrieval, a patent with the application number CN201910843941.4 discloses a laser welding machine based on water cooling that is convenient for precise docking, including a working body, a control panel, a wire, a handheld laser welding gun, a central control component, a welding device main body, a water pump, an air pump, a control switch, a water spray head, a blowing head, and a fixing bolt. A water pipe, an air pipe, and a wire are connected to the outside of the working body, and fixing clips are fixed on the water pipe, the air pipe, and the wire. The front end of the wire is connected to a handheld laser welding gun, and a control component is fixed on the upper side of the handheld laser welding gun. The welding device main body is fixed on a partition board, and the partition boards are distributed in the middle of the inside of the working body. A control switch is installed inside the control component. This laser welding machine based on water cooling that is convenient for precise docking can provide air-cooling and water-cooling functions for the device through the water pump, the air pump, the water pipe, and the air pipe on the device, effectively improving the cooling efficiency of the stainless steel after welding by the device, and thus improving the use value of the device.

[0004] Currently, most of the cold air flow channels during the cooling of the laser welding gun are straight channels, with a small contact area between the cold air and the gun body, reducing the cooling efficiency during laser welding; and some metal aerosols and harmful gases will be generated during the laser welding process, which will cause irritation to the respiratory system, and long-term exposure to these fumes may have an adverse impact on human health. Therefore, we need to propose an intelligent handheld air-cooled laser welding head. Summary of the Invention

[0005] The object of the present invention is to provide an intelligent handheld air-cooled laser welding head. Through the design of the cooling component, the outer wall of the cooling air cylinder is provided with spiral threads, and the gas pipe joint introduces external gas into the spiral gas path between the cooling air cylinder and the welding torch housing, increasing the contact area between the cold air and the gun body, thereby improving the cooling efficiency of welding; through the design of installing a flue gas recovery component on the gun head, the flue gas generated during welding is effectively recovered, reducing the harm of harmful flue gas to the human respiratory system, and the structure of the flue gas recovery component is compact and small in size, and by turning the external thread ring to drive the contraction of multiple clamping blocks to clamp the gun head, the flue gas recovery component can be quickly and conveniently installed on the gun head; an inlet pipe that can adjust the angle according to the welding angle and welding environment is installed at the front end of the flue gas recovery cylinder to ensure the effective extraction of welding flue gas; a replaceable filtering mechanism is placed inside the flue gas recovery cylinder, and it is convenient to replace multiple filter elements in the filtering mechanism in a timely manner, avoiding the reduction of the filtering effect due to the long-term use of the filter elements, so as to solve the problems proposed in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an intelligent handheld air-cooled laser welding head, including a laser welding torch main body, a gun head connected to one end of the laser welding torch main body, and a flue gas recovery component sleeved and fixed on the gun head. The interior of the laser welding torch main body is respectively provided with a lens component for adjusting the laser light output angle, a cooling component for providing cooling gas during the laser welding process, and a control component for controlling the laser welding process;

[0007] The flue gas recovery component includes a sleeved mechanism sleeved on the outer wall of the gun head, and a flue gas recovery cylinder connected to the lower end of the sleeved mechanism. One end of the air inlet of the flue gas recovery cylinder is connected with an inlet pipe with adjustable pipe orifice angle through a corrugated pipe. An exhaust port is arranged on the outer wall of the flue gas recovery cylinder. A filtering mechanism for filtering welding flue gas is installed inside the flue gas recovery cylinder. A plug that abuts against the filtering mechanism is threadedly installed at the other end of the flue gas recovery cylinder.

[0008] Preferably, the laser welding torch main body includes a welding torch housing, a cover fixed on one side of the welding torch housing, motor covers fixed at both ends of the welding torch housing, and a connecting block. An external thread interface for installing the gun head is arranged on one side of the connecting block.

[0009] Preferably, the gun head includes a clamping part inserted inside the external thread interface, a locking nut threadedly connected to the outer wall of the external thread interface, and a scale tube inserted inside the clamping part. The scale tube is locked inside the clamping part by the locking nut.

[0010] Preferably, the lens component includes a second motor installed inside the motor cover, a focusing lens group and a protective lens group fixed inside the welding torch housing. One end of the output shaft of the second motor is connected with a reflecting lens group. The reflecting lens group, the focusing lens group and the protective lens group are coaxially arranged.

[0011] Preferably, the cooling component includes a rotatable sleeve fixed to the lower end inside the housing of the welding torch. A collimating lens group is threadedly connected to the top of the rotatable sleeve. A cooling air cylinder is sleeved around the collimating lens group, and a spiral thread is provided on the outer wall of the cooling air cylinder.

[0012] Preferably, the control component includes a control board fixed to one side of the housing of the welding torch and located inside the cover housing. A switch and an indicator light are respectively provided on the cover housing, and both the switch and the indicator light are electrically connected to the control board;

[0013] An air pipe joint connected to an external air source is further provided inside the cover housing, and the air outlet end of the air pipe joint is located inside the housing of the welding torch.

[0014] Preferably, one end of the flue gas recovery cylinder is installed on the first motor through a frame, and a second gear is rotatably arranged through a rotating seat. One end of the output shaft of the first motor is connected with a first gear, the first gear meshes with the second gear, one side of the second gear is connected with a connecting column, and a pull rod is rotatably arranged between the outer wall of the connecting column and the lower end of the outer wall of the smoke inlet pipe.

[0015] Preferably, the sleeving mechanism includes a sleeve sleeved on the outer wall of the graduated tube. Annular grooves are respectively opened at both ends of the sleeve, a plurality of through holes communicating with the annular grooves are opened on the inner wall of the sleeve, a clamping member clamped on the outer wall of the graduated tube is movably installed inside the through holes, and an external thread ring for driving the clamping member to move is threadedly arranged inside the annular grooves;

[0016] The clamping member includes a clamping block movably installed inside the through hole. An inclined surface is provided on the top of the clamping block, and a spring is connected between the top of the clamping block and the inner wall of the annular groove.

[0017] Preferably, the filtering mechanism includes a plurality of filter elements, a lower mounting plate and an upper mounting plate which are rotatably connected. Mounting seats are installed on the inner walls of the lower mounting plate and the upper mounting plate, the filter elements are installed inside the mounting seats, a magnetic adsorption groove is opened on the lower mounting plate, a magnet is installed on the upper mounting plate, and the magnet is adsorbed inside the magnetic adsorption groove.

[0018] Preferably, the plug includes a sealing plate. A cross-shaped rotating block is connected to one side of the sealing plate. A threaded contact ring with external threads is connected to the other side of the sealing plate through a plurality of fixing columns, and the threaded contact ring is threadedly connected inside the flue gas recovery cylinder.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. Through the design of the cooling component, the outer wall of the cooling cylinder is provided with spiral threads. The gas pipe joint introduces external gas into the spiral gas path between the cooling cylinder and the welding torch housing, increasing the contact area between the cold air and the torch body, thereby improving the cooling efficiency of welding.

[0021] 2. Through the design of installing the flue gas recovery component on the torch head, the flue gas generated during welding is effectively recovered, reducing the harm of harmful flue gas to the human respiratory system. Moreover, the structure of the flue gas recovery component is compact and small in size, and by screwing the external thread ring to drive the contraction of multiple clamping blocks to clamp the torch head, the flue gas recovery component can be quickly and conveniently installed on the torch head.

[0022] 3. An air inlet pipe that can adjust the angle according to the welding angle and welding environment is installed at the front end of the flue gas recovery cylinder to ensure the effective extraction of welding flue gas.

[0023] 4. A replaceable filtering mechanism is placed inside the flue gas recovery cylinder, and it is convenient to replace multiple filter elements in the filtering mechanism in a timely manner to avoid the reduction of the filtering effect after the filter elements are used for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a schematic structural diagram of the torch head, lens assembly, cooling component and control component of the present invention;

[0026] Figure 3 is an exploded view of the laser welding torch main body, torch head, lens assembly, cooling component and control component of the present invention;

[0027] Figure 4 is an exploded view of the flue gas recovery component of the present invention;

[0028] Figure 5 is a schematic structural diagram of the socketing mechanism of the present invention;

[0029] Figure 6 For the present invention Figure 4 is an enlarged view of part A;

[0030] Figure 7 For the present invention Figure 4 is an enlarged view of part B;

[0031] Figure 8 is a cross-sectional view of the sleeve of the present invention.

[0032] In the figure: 1. Laser welding torch main body; 11. Welding torch housing; 12. Cover shell; 13. Motor cover; 14. Connecting block; 15. External thread interface; 2. Gun head; 21. Scale tube; 22. Clamping piece; 23. Locking nut; 3. Flue gas recovery assembly; 31. Socketing mechanism; 311. Sleeve; 312. Annular groove; 313. Through hole; 314. Clamping piece; 3141. Clamping block; 3142. Inclined surface; 3143. Spring; 315. External thread ring; 32. Flue gas recovery cylinder; 321. Exhaust port; 33. Filter mechanism; 331. Lower mounting plate; 332. Magnetic attraction groove; 333. Mounting seat; 334. Filter element; 335. Upper mounting plate; 336. Magnet; 34. Plug; 341. Sealing plate; 342. Fixed column; 343. Contact ring; 344. Rotating block; 35. Smoke inlet pipe; 36. First motor; 37. First gear; 38. Second gear; 39. Connecting column; 310. Pull rod; 4. Lens assembly; 41. Second motor; 42. Reflector group; 43. Focusing lens group; 44. Protective lens group; 5. Cooling assembly; 51. Rotatable sleeve; 52. Collimating lens group; 53. Cooling air cylinder; 6. Control assembly; 61. Control board; 62. Air pipe joint; 63. Switch; 64. Indicator lamp. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1-8 , the present invention provides a technical solution: an intelligent handheld air-cooled laser welding head, as Figure 1 and Figure 2 shown, including a laser welding torch main body 1, a gun head 2 connected to one end of the laser welding torch main body 1, and a flue gas recovery assembly 3 socketed and fixed on the gun head 2. Inside the laser welding torch main body 1, a lens assembly 4 for adjusting the laser light output angle, a cooling assembly 5 for providing cooling gas during the laser welding process, and a control assembly 6 for controlling the laser welding process are respectively provided;

[0035] The gun head 2 is used to emit laser, and the flue gas recovery assembly 3 is used to absorb the harmful flue gas generated during laser welding to reduce the harm to the respiratory system of the staff. The lens assembly 4 includes a rotatable emission lens, and the bottom of the cooling assembly 5 is locked on the fiber head of the laser, that is, the laser enters from the bottom of the cooling assembly 5.

[0036] The flue gas recovery assembly 3 includes a socketing mechanism 31 sleeved on the outer wall of the gun head 2 and a flue gas recovery cylinder 32 connected to the lower end of the socketing mechanism 31. The flue gas recovery cylinder 32 is arranged in the same direction as the socketing mechanism 31. Among them, the socketing mechanism 31 is used to fix the flue gas recovery assembly 3 on the gun head 2, and the structure installed on the flue gas recovery cylinder 32 is used for the absorption and treatment of harmful flue gas to ensure the discharge of clean gas;

[0037] One end of the air inlet of the flue gas recovery cylinder 32 is connected with a smoke inlet pipe 35 with an adjustable pipe orifice angle through a corrugated pipe. The smoke inlet angle of the smoke inlet pipe 35 is adjusted according to the welding angle and the floating direction of the flue gas during welding, which is convenient for more quickly and efficiently extracting harmful flue gas. An exhaust port 321 is arranged on the outer wall of the flue gas recovery cylinder 32, and the filtered flue gas is discharged from the exhaust port 321. A filtering mechanism 33 for filtering welding flue gas is installed inside the flue gas recovery cylinder 32. The filtering mechanism 33 is designed to be detachable and replaceable, which is convenient for timely replacement and does not affect the filtering effect of the filtering mechanism 33. A plug 34 that abuts against the filtering mechanism 33 is installed at the other end of the flue gas recovery cylinder 32 by threading, which can ensure the stability of the filtering mechanism 33 and prevent the flue gas from escaping everywhere.

[0038] As Figure 3 shown, the laser welding gun body 1 includes a welding gun housing 11, a cover 12 fixed to one side of the welding gun housing 11 by bolts, motor covers 13 and connecting blocks 14 fixed to both ends of the welding gun housing 11 by bolts. An external thread interface 15 for installing the gun head 2 is arranged on one side of the connecting block 14.

[0039] The gun head 2 includes a clamping member 22 inserted inside the external thread interface 15, a locking nut 23 threadedly connected to the outer wall of the external thread interface 15, and a scale tube 21 inserted inside the clamping member 22. The scale tube 21 is locked inside the clamping member 22 by the locking nut 23. A circle of elastic jaws arranged at equal intervals in a ring shape is provided at the clamping end of the clamping member 22. Through the extrusion of the clamping member 22 during the movement of the locking nut 23, the contraction of multiple jaws is realized, that is, the locking of the gun head 2 is realized.

[0040] The lens assembly 4 includes a second motor 41 installed inside the motor cover 13, a focusing lens group 43 and a protective lens group 44 fixed inside the welding gun housing 11. One end of the output shaft of the second motor 41 is connected with a reflecting mirror group 42. The reflecting mirror group 42, the focusing lens group 43 and the protective lens group 44 are coaxially arranged.

[0041] After the laser enters from the bottom of the cooling assembly 5, it is irradiated on the reflecting mirror group 42. The reflecting mirror group 42 emits the laser in a state parallel to the laser welding gun body, and the laser passes through the centers of the focusing lens group 43 and the protective lens group 44 and shoots out from the gun head 2 to realize the welding of the workpiece.

[0042] The cooling component 5 includes a rotatable sleeve 51 fixed to the lower end inside the welding torch housing 11. A collimating lens group 52 is threadedly connected to the top of the rotatable sleeve 51. An external thread section is provided on the outer wall of the top of the rotatable sleeve 51, and an internal thread section is provided on the inner wall of the bottom of the collimating lens group 52. The external thread section and the internal thread section are arranged in a matching manner. A cooling air cylinder 53 is sleeved around the collimating lens group 52, and spiral threads are provided on the outer wall of the cooling air cylinder 53.

[0043] Furthermore, annular sealing grooves are formed at both ends of the outer wall of the cooling air cylinder 53, and sealing rings are installed inside the sealing grooves. The outer walls of the sealing rings abut against the inner wall of the welding torch housing 11, so that a sealed spiral air path is formed between both ends of the outer wall of the cooling air cylinder 53 and the inner wall of the welding torch housing 11, increasing the contact area between the cold air and the laser welding torch main body 1 and improving the cooling effect.

[0044] The control component 6 includes a control board 61 fixed to one side of the welding torch housing 11 and located inside the housing 12. A switch 63 and an indicator light 64 are respectively provided on the housing 12, and both the switch 63 and the indicator light 64 are electrically connected to the control board 61;

[0045] The switch 63 includes a light emission switch and an adjustment switch. Four indicator lights 64 are provided, and both the first motor 36 and the second motor 41 are electrically connected to the control board 61.

[0046] The light emission switch is used to control the emission of the laser. Each indicator light 64 corresponds to a different preset process parameter combination, and different combinations are switched through the adjustment switch to achieve intelligent welding. That is, through the intelligent design of the switch 63 and the indicator light 64, the welding parameters can be quickly switched to achieve intelligent welding.

[0047] An air pipe joint 62 for connecting to an external air source is further provided inside the housing 12, and the air outlet end of the air pipe joint 62 is located inside the welding torch housing 11. The air pipe joint 62 is used to send external gas into the spiral air path.

[0048] As Figure 7 shown, one end of the flue gas recovery cylinder 32 is installed on the first motor 36 through the frame, and a second gear 38 is rotatably arranged through a rotating seat. One end of the output shaft of the first motor 36 is connected with a first gear 37, the first gear 37 meshes with the second gear 38, one side of the second gear 38 is connected with a connecting column 39, and a pull rod 310 is rotatably arranged between the outer wall of the connecting column 39 and the lower end of the outer wall of the smoke inlet pipe 35.

[0049] Specifically, the first motor 36 drives the first gear 37 to rotate, the first gear 37 drives the second gear 38 to rotate, and then drives the connecting column 39 to rotate. Since a pull rod 310 is rotatably connected between the connecting column 39 and the smoke inlet pipe 35, during the circular movement of the connecting column 39, the angle of the smoke inlet pipe 35 can be pulled by the pull rod 310 to change, realizing the adjustment of the smoke inlet angle and facilitating the more rapid and efficient extraction of harmful smoke.

[0050] As Figures 5-6 and Figure 8 shown, the sleeving mechanism 31 includes a sleeve 311 sleeved on the outer wall of the scale tube 21. Both ends of the sleeve 311 are provided with annular grooves 312. The inner wall of the sleeve 311 is provided with a plurality of through holes 313 communicating with the annular grooves 312. The plurality of through holes 313 are arranged at equal intervals in a ring shape. A clamping member 314 clamped on the outer wall of the scale tube 21 is movably installed inside the through holes 313. The plurality of clamping members 314 all move closer to or away from the axis of the annular groove 312. An external thread ring 315 for driving the clamping member 314 to move is arranged inside the annular groove 312 in a threaded manner;

[0051] Turn the external thread ring 315 to drive the external thread ring 315 to move inside the annular groove 312. The end of the external thread ring 315 abuts against the inclined surfaces 3142 of the plurality of clamping blocks 3141 and pushes the plurality of clamping blocks 3141 to move and contract towards the center of the sleeve 311. The spring 3143 is stretched, and the bottom of the clamping block 3141 abuts against the outer wall of the scale tube 21.

[0052] The clamping member 314 includes a clamping block 3141 movably installed inside the through hole 313. The top of the clamping block 3141 is provided with an inclined surface 3142. A spring 3143 is connected between the top of the clamping block 3141 and the inner wall of the annular groove 312.

[0053] As Figure 4 shown, the filtering mechanism 33 includes a plurality of filter elements 334, a lower mounting plate 331 and an upper mounting plate 335 which are rotatably connected. Mounting seats 333 are installed on the inner walls of the lower mounting plate 331 and the upper mounting plate 335. The filter elements 334 are installed inside the mounting seats 333. A magnetic attraction groove 332 is formed on the lower mounting plate 331, and a magnet 336 is installed on the upper mounting plate 335. The magnet 336 is adsorbed inside the magnetic attraction groove 332.

[0054] A retaining ring is installed at one end of the inside of the flue gas recovery cylinder 32 close to the smoke inlet pipe 35 for blocking one end of the filtering mechanism 33.

[0055] Both the lower mounting plate 331 and the upper mounting plate 335 are semi-circular mounting plates. The plurality of filter elements 334 are arranged at equal intervals. The types and materials of the filter elements 334 are selected as commonly used filter elements in the market, as long as they can filter the flue gas during laser welding. The filter elements 334 will not be specifically described here.

[0056] As Figure 4 shown, the plug 34 includes a sealing plate 341. One side of the sealing plate 341 is connected with a cross-shaped rotating block 344. The other side of the sealing plate 341 is connected with a threaded contact ring 343 through a plurality of fixing columns 342. The threaded contact ring 343 is threadedly connected inside the flue gas recovery cylinder 32.

[0057] During use, first install the flue gas recovery assembly 3 on the gun head 2. Specifically, sleeved the sleeve 311 in the socket mechanism 31 on the graduated tube 21, and then turn the external thread ring 315 to drive the external thread ring 315 to move inside the annular groove 312. The end of the external thread ring 315 abuts against the inclined surfaces 3142 of a plurality of clamping blocks 3141, and pushes a plurality of clamping blocks 3141 to move and contract towards the center of the sleeve 311. The spring 3143 is stretched. The bottom of the clamping block 3141 abuts against the outer wall of the graduated tube 21, and then the flue gas recovery assembly 3 can be fixed on the gun head 2.

[0058] Then turn on the laser to emit laser light. The laser passes through the rotatable sleeve 51 and the collimating lens group 52, and irradiates on the reflecting mirror group 42. The reflecting mirror group 42 emits the laser in a state parallel to the laser welding gun body, and the laser passes through the center of the focusing lens group 43 and the protective lens group 44 and shoots out from the gun head 2 to realize the welding of the workpiece.

[0059] During the welding process, the gas pipe joint 62 sucks the external gas into the inside of the welding gun housing 11 (specifically, sucks it into the middle of the spiral gas path between the outer walls of both ends of the cooling gas cylinder 53 and the inner wall of the welding gun housing 11). The cooling gas flows in the spiral gas path and flows into the transverse gas path on the horizontal part of the welding gun housing 11. Through the design of the spiral gas path, the contact area between the cooling gas and the laser welding gun body 1 is increased, and the cooling efficiency of the welding is improved.

[0060] To ensure the safety during the laser welding process and prevent harmful flue gas from harming the staff, the laser welding flue gas is sucked into the inside of the flue gas recovery cylinder 32 through the smoke inlet pipe 35, and the smoke inlet angle of the smoke inlet pipe 35 can be adjusted according to the welding angle and the floating direction of the flue gas during welding. Specifically, the first motor 36 drives the first gear 37 to rotate, the first gear 37 drives the second gear 38 to rotate, and further drives the connecting column 39 to rotate. Since a pull rod 310 is rotatably connected between the connecting column 39 and the smoke inlet pipe 35, during the circular movement of the connecting column 39, the angle of the smoke inlet pipe 35 can be pulled through the pull rod 310 to change, realizing the adjustment of the smoke inlet angle, which is convenient for more quickly and efficiently extracting harmful flue gas.

[0061] After the harmful flue gas is drawn into the interior of the flue gas recovery cylinder 32, the harmful flue gas passes through multiple filter elements 334 in the filtering mechanism 33, achieving the absorption of impurities and harmful substances in the harmful flue gas, and the purified flue gas is discharged from the exhaust port 321.

[0062] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent handheld air-cooled laser welding head, characterized in that: It includes a laser welding torch body (1), a gun head (2) connected to one end of the laser welding torch body (1), and a flue gas recovery assembly (3) sleeved and fixed on the gun head (2). Inside the laser welding torch body (1), there are respectively provided a lens assembly (4) for adjusting the laser light output angle, a cooling assembly (5) for providing cooling gas during the laser welding process, and a control assembly (6) for controlling the laser welding process; The flue gas recovery assembly (3) includes a sleeving mechanism (31) sleeved on the outer wall of the gun head (2), and a flue gas recovery cylinder (32) connected to the lower end of the sleeving mechanism (31). The intake port end of the flue gas recovery cylinder (32) is connected with a smoke inlet pipe (35) with an adjustable pipe orifice angle through a corrugated pipe. An exhaust port (321) is provided on the outer wall of the flue gas recovery cylinder (32). A filtering mechanism (33) for filtering welding fumes is installed inside the flue gas recovery cylinder (32). A plug (34) that abuts against the filtering mechanism (33) is threadedly installed at the other end of the flue gas recovery cylinder (32); The laser welding torch body (1) includes a welding torch housing (11), a cover housing (12) fixed on one side of the welding torch housing (11), motor covers (13) and connection blocks (14) fixed at both ends of the welding torch housing (11). An external thread interface (15) for installing the gun head (2) is provided on one side of the connection block (14); The cooling assembly (5) includes a rotatable sleeve (51) fixed at the lower end inside the welding torch housing (11). A collimating lens group (52) is threadedly connected to the top of the rotatable sleeve (51). A cooling gas cylinder (53) is sleeved around the collimating lens group (52). The outer wall of the cooling gas cylinder (53) is provided with spiral threads; One end of the flue gas recovery cylinder (32) is installed on a first motor (36) through a frame, and a second gear (38) is rotatably arranged through a rotating seat. One end of the output shaft of the first motor (36) is connected with a first gear (37). The first gear (37) meshes with the second gear (38). A connecting column (39) is connected to one side of the second gear (38). A pull rod (310) is rotatably arranged between the outer wall of the connecting column (39) and the lower end of the outer wall of the smoke inlet pipe (35); The sleeving mechanism (31) includes a sleeve (311) sleeved on the outer wall of a scale tube (21). Annular grooves (312) are provided at both ends of the sleeve (311). A plurality of through holes (313) communicating with the annular grooves (312) are provided on the inner wall of the sleeve (311). Clamping members (314) clamped on the outer wall of the scale tube (21) are movably installed inside the through holes (313). An external thread ring (315) for driving the clamping members (314) to move is threadedly arranged inside the annular grooves (312); The clamping member (314) includes a clamping block (3141) movably installed inside the through hole (313). An inclined surface (3142) is provided at the top of the clamping block (3141). A spring (3143) is connected between the top of the clamping block (3141) and the inner wall of the annular groove (312); The plug (34) includes a sealing plate (341). One side of the sealing plate (341) is connected with a cross-shaped rotating block (344). The other side of the sealing plate (341) is connected with a contact ring (343) with external threads through a plurality of fixing columns (342). The contact ring (343) is threadedly connected inside the flue gas recovery cylinder (32).

2. The intelligent handheld air-cooled laser welding head according to claim 1, wherein: The gun head (2) includes a clamping member (22) inserted inside an external thread interface (15), a locking nut (23) threadedly connected to the outer wall of the external thread interface (15), and a scale tube (21) inserted inside the clamping member (22). The scale tube (21) is locked inside the clamping member (22) through the locking nut (23).

3. The intelligent handheld air-cooled laser welding head according to claim 2, wherein: The lens assembly (4) includes a second motor (41) installed inside the motor cover (13), a focusing lens group (43) and a protective lens group (44) fixed inside the welding gun housing (11). One end of the output shaft of the second motor (41) is connected with a reflecting lens group (42). The reflecting lens group (42), the focusing lens group (43) and the protective lens group (44) are coaxially arranged.

4. The intelligent handheld air-cooled laser welding head according to claim 1, wherein: The control assembly (6) includes a control board (61) fixed on one side of the welding gun housing (11) and located inside the housing (12). A switch (63) and an indicator light (64) are respectively arranged on the housing (12). The switch (63) and the indicator light (64) are both electrically connected to the control board (61); An air pipe joint (62) connected to an external air source is further arranged inside the housing (12). The air outlet end of the air pipe joint (62) is located inside the welding gun housing (11).

5. The intelligent handheld air-cooled laser welding head according to claim 1, wherein: The filtering mechanism (33) includes a plurality of filter elements (334), a lower mounting plate (331) and an upper mounting plate (335) connected in a rotating manner. Mounting seats (333) are installed on the inner walls of the lower mounting plate (331) and the upper mounting plate (335). The filter elements (334) are installed inside the mounting seats (333). A magnetic attraction groove (332) is formed in the lower mounting plate (331). A magnet (336) is installed on the upper mounting plate (335). The magnet (336) is adsorbed inside the magnetic attraction groove (332).

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