A hand-held laser welding apparatus

Abstract

The present application belongs to the technical field of laser welding, and particularly relates to a handheld laser welding device, which comprises a laser welding gun, a support assembly, a wire feeding assembly and a smoke suction assembly. The laser welding gun is used for laser welding, the support assembly is used for mounting the laser welding gun, the wire feeding assembly is used for continuously feeding single or double welding wires to the welding point by the movement of the support assembly, and the smoke suction assembly is used for cleaning and recycling the metal smoke dust generated at the welding point. In the present application, the wire feeding assembly only needs to be installed with a wire feeding disc on the frame body, and can automatically feed the welding wire below the welding nozzle head of the welding gun by the movement of the walking wheels at the bottom of the frame body. Compared with the existing wire feeding mode by using a wire feeding machine, the wire feeding assembly of the present application effectively reduces the purchase cost of the handheld laser welding device due to its simple structure and small size.

Description

Technical Field

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

[0002] Handheld laser welding equipment (also known as handheld laser welders) is a portable and flexible high-energy beam welding tool that has been widely used in metal processing, automotive repair, mold repair, sheet metal manufacturing, and other industries in recent years. It combines the high precision of traditional laser welding with the flexibility of manual operation, making it particularly suitable for small to medium batch production, complex structures, or on-site work scenarios.

[0003] Existing handheld laser welding equipment suffers from significant damage to the laser when welding highly reflective materials, as the reflected light from these materials can easily damage the laser. Handheld operation relies heavily on manual hand stability, resulting in large fluctuations in speed, angle, and distance. This leads to noticeable differences in welding quality between different operators and even among the same operator at different times, resulting in poor weld consistency. Furthermore, the handheld operation makes it impossible to maintain a constant nozzle-to-workpiece distance; even slight fluctuations can cause abrupt changes in penetration depth and weld formation, making it highly dependent on operator skill. Additionally, the need for continuous gripping during prolonged operation can easily lead to hand fatigue, affecting the stability of the welding torch.

[0004] Existing handheld laser welding equipment requires a wire feeder to fill the molten pool with wire in order to solve problems such as large weld gaps and incomplete penetration of thick plates. Existing wire feeders are complex in structure, large in size and heavy, and have high purchase costs.

[0005] In addition, the protective lens, focusing lens, and collimating lens inside the welding torch are easily contaminated by welding fumes and dust, requiring frequent cleaning and replacement. At the same time, the metal fumes and ozone produced by welding can damage the operator's respiratory tract.

[0006] This invention designs a handheld laser welding device to solve the above problems. Summary of the Invention

[0007] Therefore, it is necessary to address the problems existing in current handheld laser welding equipment by providing a handheld laser welding device that improves the operator's operational stability and handheld welding quality by using a support assembly to provide a stable welding angle and welding distance for the welding torch. The present invention achieves the effect of feeding welding wire to the welding nozzle and preventing the environmental pollution caused by fumes generated during the welding process by installing a wire feeding assembly and a fume extraction assembly on the frame.

[0008] The above objectives are achieved through the following technical solutions: A handheld laser welding device for laser welding, comprising: A laser welding gun is used for laser welding. The laser welding gun includes a gun body and a gun barrel disposed at the end of the cavity. The end of the gun barrel is provided with a welding nozzle assembly to prevent fumes from entering the gun body through the gun barrel and damaging the optical lens.

[0009] A support assembly for mounting a laser welding gun includes a frame with a first fixed shaft and a second fixed shaft arranged vertically on the frame. A first bushing is rotatably mounted on the first fixed shaft, and a handle is mounted on the first bushing. Both ends of the second fixed shaft are provided with traveling wheels via fourth bushings. A second bushing, which is rotatably connected to the first bushing, is rotatably mounted on the middle of the second fixed shaft. Two auxiliary arms, parallel to the handle and swinging in the same direction as the handle, are symmetrically arranged on the second bushing. The movable ends of the auxiliary arms are provided with auxiliary wheels via first wheel axles, and the diameter of the auxiliary wheels is equal to the diameter of the traveling wheels.

[0010] The wire feeding assembly, mounted on the frame, is used to continuously feed single-strand or double-strand welding wire to the welding point by utilizing the rotation of the traveling wheels. The wire feeding assembly includes two wire feeding discs mounted at both ends of a first fixed shaft and a wire feeding structure that continuously feeds the welding wire from a single wire feeding disc or the welding wire from both wire feeding discs to the welding point.

[0011] The fume extraction unit, mounted on the frame, is used to extract and recover the metal fumes generated at the welding point from both sides of the welding nozzle assembly.

[0012] In one embodiment, the welding nozzle assembly includes a connecting sleeve threaded to the end of the barrel. An exhaust sleeve is connected to the end of the connecting sleeve. The exhaust sleeve is connected to a welding nozzle head via a guide cone sleeve. A second limiting groove is provided on the outer side of the end of the welding nozzle head to guide a single-strand or double-strand welding wire to the welding point. An annular seat is provided inside the exhaust sleeve. An annular plate is rotatably provided on the annular seat. A gear ring is provided on the annular plate. The gear ring meshes with a fifth gear on the output shaft of a first motor outside the connecting sleeve. An annular sleeve is provided on the annular plate. A plurality of spiral blades are uniformly arranged circumferentially on the inner wall of the annular sleeve, which are coaxial with the connecting sleeve and do not obstruct the laser.

[0013] In one embodiment, the handle is provided with a guide ring coaxial with the first fixed shaft. The guide ring rotates within an arc-shaped first guide sleeve on the frame. The guide ring is provided with a first spring connecting the first guide sleeve and the handle, causing the handle to swing to the plane containing the central axes of the first and second fixed shafts. The frame is provided with a first limiting rod and a second limiting rod to limit the swing amplitude of the handle. A second wheel shaft is connected between the two auxiliary arms. A third bushing, which is rotatably connected to the two first wheel shafts, is mounted on the second wheel shaft. A cleaning wheel is provided on the third bushing. The rim of the cleaning wheel is densely covered with steel wire bristles that mate with the workpiece.

[0014] In one embodiment, both ends of the first bushing are provided with first pulleys. The first pulleys are connected to the second pulleys provided on the corresponding side ends of the second bushing via a first synchronous belt. The swing amplitude of the handle and the auxiliary arm is greater than 90 degrees and the swing amplitudes of the two are equal, ensuring that the first fixed shaft on the frame is located on the front side above the second fixed shaft when the handle is swung down to a horizontal state, thereby ensuring the walking stability of the frame.

[0015] In one embodiment, the transmission ratio between the first pulley and the second pulley is 1:1, ensuring that the handle remains horizontal during the movement of the frame.

[0016] In one embodiment, two first gears are symmetrically arranged at both ends of the third bushing. The first gear meshes with a second gear arranged on the corresponding side auxiliary arm. The second gear meshes with a third gear arranged on the corresponding side auxiliary arm. The third gear meshes with a fourth gear arranged on the corresponding side first wheel shaft. The transmission ratio between the fourth gear and the corresponding side first gear is less than 1, ensuring that the rotational speed of the cleaning wheel is greater than the rotational speed of the auxiliary wheel, thereby achieving effective roughening treatment of the high-reflectivity material workpiece near the weld.

[0017] In one embodiment, the wire feeding structure includes two wire feeding tubes symmetrically arranged on both sides of the frame, guiding the welding wire on the corresponding wire feeding reels to the second limiting groove below the welding nozzle. The wire feeding reels are limited by positioning nuts threaded to the corresponding ends of the first fixed shaft. Welding wire is wound on the wire feeding reels. The ends of the two wire feeding tubes are connected to a wire paralleling section. The wire paralleling section is provided with two wire paralleling channels that guide a single strand of welding wire on one side or a double strand of welding wire on both sides to be nearly centered and directly below the nozzle. A wire exit head is slidably arranged on the arc surface of the end of the wire paralleling section around its central axis. The wire exit head is provided with two first wire guide channels that correspond one-to-one with the wire paralleling channels and further guide the double strand of welding wire to be nearly centered and directly into the second limiting groove, and a second wire guide channel that further guides a single strand of welding wire in any wire paralleling channel to be further centered and directly into the second limiting groove. Both sides of the wire exit head are provided with first limiting grooves on the corresponding sides of the wire paralleling section. The device includes a limiting block for limiting the swing amplitude of the wire feeding head. A fixing pin with the same central axis as the arc surface at its end is provided on the lower side of the wire feeding part. A swing arm connected to the wire feeding head is rotatably mounted on the fixing pin and threadedly connected to a first locking nut for locking the swing arm. The wire feeding assembly also includes two third wheel shafts symmetrically arranged on both sides of the frame and parallel to the first fixed shaft, and two second guide sleeves corresponding to the third wheel shafts. A fifth shaft sleeve rotatably mounted on the third wheel shaft is connected to a corresponding fourth shaft sleeve. A wire feeding wheel is provided on the fifth shaft sleeve to guide the welding wire on the corresponding wire feeding disc into the corresponding wire feeding tube. An annular wire groove for accommodating the welding wire is provided on the rim of the wire feeding wheel. A first push rod slides within the two second guide sleeves and is provided with a second spring for extending the first push rod. The end of the first push rod is provided with a pressure roller via the fourth wheel shaft to press the welding wire on the corresponding side into the wire groove on the corresponding wire feeding wheel.

[0018] In one embodiment, a fourth pulley is provided on the fifth bushing. The fourth pulley is connected to a third pulley provided on the corresponding side fourth bushing via a second synchronous belt. The radius ratio of the fourth pulley to the wire groove on the corresponding wire feeding wheel is equal to the radius ratio of the corresponding third pulley to the corresponding side traveling wheel.

[0019] In one embodiment, the frame is provided with a clamping assembly for tilting and fixing the gun body. The clamping assembly includes two third guide sleeves symmetrically arranged on both sides of the frame with the same central axis. A second push rod slides horizontally inside the third guide sleeve and a second locking nut is rotatably provided with a threaded connection to the second push rod. The ends of the two second push rods are provided with two clamps for clamping the gun body of the laser welding gun.

[0020] In one embodiment, the fumigation assembly includes a negative pressure cylinder and two fumigation hoods symmetrically arranged on both sides of the frame. The two fumigation hoods are respectively located above the welding nozzles on both sides. Both fumigation hoods are connected to one end of the negative pressure cylinder through a negative pressure pipe. The other end of the negative pressure cylinder is connected to a smoke and dust recovery device through a smoke exhaust pipe. Several blades are arranged inside the negative pressure cylinder through a rotating shaft. The rotating shaft is drivenly connected to the output shaft of a second motor outside the negative pressure cylinder.

[0021] The beneficial effects of this invention are: 1. This invention provides a stable, fixed-angle support for the welding torch through a bracket assembly and a clamping assembly on the frame. This reduces the reliance on operator experience in handheld laser welding, ensuring the welding torch maintains a stable tilt angle and a consistent nozzle-to-workpiece distance for long-distance welding, thus improving welding stability and quality. Furthermore, the bracket assembly eliminates the need for single-handed gripping; instead, it allows for single-handed pressing and movement. Compared to traditional hand-held welding torch grips, this method reduces hand fatigue during extended welding sessions, effectively improving welding efficiency.

[0022] 2. The cleaning structure in the support assembly of the present invention can clean the area near the weld before the welding nozzle of the welding torch, avoiding defects such as porosity after welding due to slag contamination. At the same time, the cleaning structure can roughen the area near the weld of highly reflective materials, ensuring that the reflection of highly reflective materials does not damage the laser.

[0023] 3. The wire feeding assembly in this invention can automatically feed the welding wire to the nozzle of the welding gun by means of the movement of the traveling wheels at the bottom of the frame, simply by installing a wire feeding tray on the frame. Compared with the existing method of feeding wire using a wire feeder, the wire feeding assembly of this invention effectively reduces the purchase cost of handheld laser welding equipment due to its simple structure and small size.

[0024] 4. The fumigation component in this invention utilizes negative pressure to absorb and transport the metal fumes generated during welding to a fumigation absorption device, thus avoiding physiological harm to the operator caused by the fumes.

[0025] 5. The structure of the barrel end of the welding torch of the present invention can prevent the metal fumes generated during the welding process from entering the torch body through the barrel and contaminating and damaging the protective lens, focusing lens, and collimating lens. It eliminates the need for frequent cleaning and replacement of the protective lens, focusing lens, and collimating lens, thereby reducing the maintenance cost of the welding torch. Attached Figure Description

[0026] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is the first overall sectional view of the present invention; Figure 3 This is a first cross-sectional view of the present invention; Figure 4 This is a second cross-sectional view of the present invention; Figure 5 This is a third cross-sectional view of the present invention; Figure 6 This is the second overall sectional view of the present invention; Figure 7 This is the third overall sectional view of the present invention; Figure 8 This is a fourth cross-sectional view of the present invention; Figure 9 This is a fifth cross-sectional view of the present invention; Figure 10 This is a sixth cross-sectional view of the present invention; Figure 11 This is a seventh cross-sectional view of the present invention; Figure 12 This is the eighth cross-sectional view of the present invention; Figure 13 This is the fourth overall sectional view of the present invention; Figure 14 This is a cross-sectional view of the ninth section of the present invention; Figure 15 This is a cross-sectional view of the wire feeding tube structure; Figure 16 This is a schematic diagram of the frame structure; Labels in the diagram: 100. Support assembly; 101. Frame body; 102. First fixed shaft; 103. Second fixed shaft; 104. First limiting rod; 105. Second limiting rod; 106. First guide sleeve; 107. First bushing; 108. Handle; 109. Guide ring; 110. First spring; 111. First pulley; 112. First synchronous belt; 113. Second pulley; 114. Second bushing; 115. Auxiliary arm; 116. First wheel axle; 117. Auxiliary wheel; 118. Cleaning structure; 119. Second wheel axle; 120. Third bushing; 121. Cleaning wheel; 122. Wire brush bristles; 123. First gear; 124. Second gear; 125. Third gear; 126. Fourth gear; 127. Fourth bushing; 128. Traveling wheel; 200. Wire feeding assembly; 201. Third pulley; 202. Second synchronous belt; 203. Fourth pulley; 204. Fifth bushing; 205. Third shaft; 206. Wire feeding wheel; 207. Wire groove; 208. Second guide sleeve; 209. Second spring; 210. First push rod; 211. Fourth shaft; 212. Pressure roller; 213. Wire feeding tube; 214. Wire paralleling section; 215. Wire paralleling path; 216. First limiting groove; 217. Wire exit head; 218. First wire guide path; 219. Second wire guide path; 220. Limiting block; 221. Swing arm; 222. Fixing pin; 223. First locking nut; 224. Wire feeding reel; 225. Welding wire; 226. Positioning nut; 227. Wire feeding structure; 300. Clamping assembly; 301. Second push rod; 302. Second locking nut; 303. Clamp; 304. Third guide sleeve; 400. Laser welding torch; 401. Torch body; 402. Torch barrel; 403. Connecting sleeve; 404. Exhaust sleeve; 405. Ring seat; 406. Guide cone sleeve; 407. Welding nozzle head; 408. Second limiting groove; 409. Ring plate; 410. Ring sleeve; 411. Spiral blade; 412. Gear ring; 413. Fifth gear; 414. First motor; 415. Welding nozzle assembly; 500. Smoke extraction assembly; 501. Negative pressure cylinder; 502. Exhaust pipe; 503. Negative pressure pipe; 504. Smoke hood; 505. Second motor; 506. Rotating shaft; 507. Blade. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] like Figure 1-16 As shown, a handheld laser welding device for laser welding includes: A laser welding gun 400 is used for laser welding. The laser welding gun 400 includes a gun body 401 and a gun barrel 402 disposed at the end of the cavity. The end of the gun barrel 402 is provided with a welding nozzle assembly 415 to prevent fumes from entering the gun body 401 through the gun barrel 402 and causing damage to the optical lens.

[0031] A bracket assembly 100 is used to mount a laser welding torch 400. The bracket assembly 100 has structural features that improve welding stability and prevent highly reflective workpieces from damaging the laser due to reflection by maintaining a constant distance between the welding nozzle 407 of the laser welding torch 400 and the workpiece during the welding process.

[0032] The wire feeding assembly 200, which is mounted on the support assembly 100, is used to continuously feed a single strand of welding wire 225 or a double strand of welding wire 225 to the welding point by means of the movement of the support assembly 100.

[0033] The fume extraction assembly 500, installed on the support assembly 100, is used to clean up and recycle the metal fumes generated at the solder joints.

[0034] In a further embodiment, such as Figure 2 , Figure 4 , Figure 8As shown, the laser welding gun 400 includes a gun body 401 and a gun barrel 402 disposed at the end of the gun body 401. The welding nozzle assembly 145 includes a connecting sleeve 403 threadedly connected to the end of the gun barrel 402. An exhaust sleeve 404 is connected to the end of the connecting sleeve 403. The exhaust sleeve 404 is connected to a welding nozzle head 407 via a guide cone sleeve 406. A second limiting groove 4 is provided on the outer side of the end of the welding nozzle head 407 to guide a single-strand welding wire 225 or a double-strand welding wire 225 to the welding point. 08. An annular seat 405 is provided inside the exhaust sleeve 404. An annular plate 409 is rotatably provided on the annular seat 405. A gear ring 412 is provided on the annular plate 409. The gear ring 412 meshes with the fifth gear 413 on the output shaft of the first motor 414 outside the connecting sleeve 403. An annular sleeve 410 is provided on the annular plate 409. A plurality of spiral blades 411 are evenly arranged circumferentially on the inner wall of the annular sleeve 410, which are coaxial with the connecting sleeve 403 and do not obstruct the laser.

[0035] In a further embodiment, such as Figure 3 , Figure 12 , Figure 16 As shown, the support assembly 100 includes a frame 101. The frame 101 has a first fixed shaft 102 and a second fixed shaft 103 arranged vertically. A first bushing 107 is rotatably mounted on the middle of the first fixed shaft 102. A handle 108 is mounted on the middle of the first bushing 107. A guide ring 109, coaxial with the first fixed shaft 102, is mounted on the handle 108. The guide ring 109 rotates within an arc-shaped first guide sleeve 106 on the frame 101. A first spring 110, connecting the first guide sleeve 106 and the handle 108, is mounted on the guide ring 109 to allow the handle 108 to swing to the plane containing the central axes of the first fixed shaft 102 and the second fixed shaft 103. A first limiting rod 104 and a second limiting rod 105 are mounted on the frame 101 to limit the swing amplitude of the handle 108. The second fixed shaft 102... A second bushing 114, which is rotatably connected to the first bushing 107, is rotatably mounted in the middle of the second fixed shaft 103. Two auxiliary arms 115 are symmetrically mounted on the second bushing 114. The swing direction of the auxiliary arms 115 is the same as that of the handle 108. An auxiliary wheel 117 is mounted on the movable end of the auxiliary arm 115 through the first wheel axle 116. The wheel diameter of the auxiliary wheel 117 is equal to the wheel diameter of the traveling wheel 128. A second wheel axle 119 is connected between the two auxiliary arms 115. A third bushing 120, which is rotatably mounted on the second wheel axle 119 and is rotatably connected to the two first wheel axles 116, is mounted on the third bushing 120. A cleaning wheel 121 is mounted on the third bushing 120. The rim of the cleaning wheel 121 is densely covered with steel wire bristles 122 that cooperate with the workpiece. Traveling wheels 128 are mounted on both ends of the second fixed shaft 103 through the fourth bushing 127.

[0036] In a further embodiment, such as Figure 3 , Figure 6 , Figure 12 As shown, both ends of the first bushing 107 are provided with first pulleys 111. The first pulleys 111 are connected to the second pulleys 113 provided on the corresponding side ends of the second bushing 114 via the first synchronous belt 112. The swing amplitude of the handle 108 and the auxiliary arm 115 is greater than 90 degrees and the swing amplitudes of the two are equal.

[0037] In a further embodiment, such as Figure 3 , Figure 6 , Figure 12 As shown, the transmission ratio between the first pulley 111 and the second pulley 113 is 1:1.

[0038] In a further embodiment, such as Figure 12 As shown, two first gears 123 are symmetrically arranged at both ends of the third bushing 120. The first gears 123 mesh with the second gears 124 arranged on the corresponding side auxiliary arm 115. The second gears 124 mesh with the third gears 125 arranged on the corresponding side auxiliary arm 115. The third gears 125 mesh with the fourth gears 126 arranged on the corresponding side first wheel shaft 116. The transmission ratio between the fourth gears 126 and the corresponding side first gears 123 is less than 1.

[0039] In a further embodiment, such as Figures 7-11 , Figure 15As shown, the wire feeding assembly 200 includes two wire feeding discs 224 respectively disposed at both ends of the first fixed shaft 102 and two wire feeding tubes 213 symmetrically disposed on both sides of the frame 101, which guide the welding wire 225 on the corresponding wire feeding discs 224 to the second limiting groove 408 below the welding nozzle 407. The wire feeding discs 224 are limited by positioning nuts 226 threaded to the corresponding ends of the first fixed shaft 102. Welding wire 225 is wound on the wire feeding discs 224. The ends of the two wire feeding tubes 213 are connected to a wire paralleling part 214. The wire paralleling part 214 is provided with two wire paralleling parts that allow either a single strand of welding wire 225 or a single strand of welding wire 225 to be fed to either side. The two double-strand welding wires 225 on both sides are guided to the wire-parallel channel 215 directly below the gun barrel 402. The wire-parallel section 214 has a wire-exit head 217 slidably disposed on the arc surface of its end around its central axis. The wire-exit head 217 is provided with two first wire-leading channels 218 corresponding one-to-one with the wire-parallel channel 215 and further guiding the double-strand welding wires 225 to the second limiting groove 408, and a second wire-leading channel 219 further guiding the single-strand welding wire 225 in any wire-parallel channel 215 to the second limiting groove 408. The wire-exit head 217 is provided with a first limiting on both sides corresponding to the wire-parallel section 214. A limiting block 220, which cooperates with the groove 216 and is used to limit the swing of the wire feed head 217, is provided on the lower side of the wire feeding part 214. A fixing pin 222 with the same central axis as its end arc surface is provided on the fixing pin 222. A swing arm 221 connected to the wire feed head 217 is rotatably provided on the fixing pin 222 and a first locking nut 223 for locking the swing arm 221 is threadedly connected to it. The wire feeding assembly 200 also includes two third wheel shafts 205 symmetrically arranged on both sides of the frame 101 and parallel to the first fixed shaft 102, and two second guide sleeves 208 corresponding to the third wheel shafts 205. A corresponding guide sleeve 208 is rotatably provided on the third wheel shaft 205. The fifth bushing 204 is connected to the fourth bushing 127. The fifth bushing 204 is provided with a wire feeding wheel 206 that guides the welding wire 225 on the corresponding side wire feeding disc 224 to the corresponding side wire feeding tube 213. The rim of the wire feeding wheel 206 is provided with an annular wire groove 207 for accommodating the welding wire 225. A first push rod 210 slides in the two second guide sleeves 208 and is provided with a second spring 209 that extends the first push rod 210. The end of the first push rod 210 is provided with a pressure wheel 212 through the fourth wheel axle 211 that presses the welding wire 225 on the corresponding side against the wire groove 207 on the corresponding wire feeding wheel 206.

[0040] In a further embodiment, such as Figure 7 , Figure 9 , Figure 10 , Figure 12As shown, a fourth pulley 203 is provided on the fifth bushing 204. The fourth pulley 203 is connected to the third pulley 201 provided on the corresponding side fourth bushing 127 via a second synchronous belt 202. The radius ratio of the fourth pulley 203 to the wire groove 207 on the corresponding wire feeding wheel 206 is equal to the radius ratio of the corresponding third pulley 201 to the corresponding side traveling wheel 128.

[0041] In a further embodiment, such as Figure 2 , Figure 7 , Figure 13 , Figure 14 As shown, the frame 101 is provided with a clamping assembly 300 for tilting and fixing the body 401 of the laser welding gun 400. The clamping assembly 300 includes two third guide sleeves 304 symmetrically arranged on both sides of the frame 101 with the same central axis. A second push rod 301 slides horizontally inside the third guide sleeve 304 and a second locking nut 302 is rotatably connected to the second push rod 301. The ends of the two second push rods 301 are provided with two clamps 303 for clamping the body 401 of the laser welding gun 400.

[0042] In a further embodiment, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 8 , Figure 13 , Figure 14 As shown, the fumigation assembly 500 includes a negative pressure cylinder 501 and two fumigation hoods 504 symmetrically arranged on both sides of the frame 101. The two fumigation hoods 504 are respectively located above the welding nozzle 407 on both sides. Both fumigation hoods 504 are connected to one end of the negative pressure cylinder 501 through a negative pressure pipe 503. The other end of the negative pressure cylinder 501 is connected to the smoke and dust recovery equipment through a smoke exhaust pipe 502. Several blades 507 are arranged inside the negative pressure cylinder 501 through a rotating shaft 506. The rotating shaft 506 is connected to the output shaft of the second motor 505 outside the negative pressure cylinder 501.

[0043] This invention provides a stable, fixed-angle support for the welding torch through the support assembly 100 and the clamping assembly 300 on the frame 101. This reduces the reliance on operator experience in handheld laser welding, ensuring the welding torch maintains a stable tilt angle and welding distance, thus improving welding stability and quality. Furthermore, the support assembly 100 eliminates the need for single-handed gripping; instead, it allows for single-handed pressing and movement. Compared to traditional hand-held welding torch grips, this method reduces hand fatigue during prolonged welding, effectively improving welding efficiency. The cleaning structure 118 in the support assembly 100 cleans the area near the weld before the welding nozzle 407, preventing defects such as porosity caused by slag contamination. Simultaneously, the cleaning structure 118 roughens the area near the weld of highly reflective materials, preventing damage to the laser from the reflected light. The wire feeding assembly 200 of this invention automatically feeds the welding wire 225 below the welding nozzle 407 of the welding torch by means of the movement of the traveling wheels 128 at the bottom of the frame 101, simply by installing the wire feeding tray 224 on the frame 101. Compared with the existing method of feeding wire using a wire feeder, the wire feeding assembly 200 of this invention effectively reduces the purchase cost of handheld laser welding equipment due to its simple structure and small size. The fume extraction assembly 500 of this invention uses negative pressure to absorb and transport the metal fumes generated during welding to the fume extraction device, avoiding physiological harm to the operator caused by the fumes. The structure at the end of the barrel 402 of the welding torch of this invention can prevent the metal fumes generated during welding from entering the torch body 401 through the barrel 402 and contaminating and damaging the protective lens, focusing lens, and collimating lens, eliminating the need for frequent cleaning and replacement of the protective lens, focusing lens, and collimating lens, thus reducing the maintenance cost of the welding torch.

[0044] The operation flow of this invention is as follows: In the initial state, the laser welding gun 400 is not installed on the frame 101. The handle 108 is located above the first fixed shaft 102 and within the plane containing the central axis of the first fixed shaft 102 and the central axis of the second fixed shaft 103, and abuts against the first fixed shaft 102. The two auxiliary arms 115 are located between the first fixed shaft 102 and the second fixed shaft 103 and within the plane containing the central axis of the first fixed shaft 102 and the central axis of the second fixed shaft 103. The first spring 110 is in a compressed state. The wire feeder 224 is not installed on the first fixed shaft 102.

[0045] When laser welding is required using the present invention, the laser welding gun 400 is fixed in an inclined state within the frame 101 by the clamping assembly 300, and the gap between the welding nozzle 407 of the laser welding gun 400 and the workpiece is adjusted.

[0046] As needed, a wire feeding disc 224 is installed at one end of the first fixed shaft 102, or two wire feeding discs 224 are installed at both ends of the first fixed shaft 102. The position of the wire feed head 217 is adjusted as needed. When only one welding wire 225 is needed, the wire feed head 217 is swung so that the second wire guide 219 is opposite to the two parallel wire guides 215 on the parallel wire section 214. When two welding wires 225 are needed, the wire feed head 217 is swung so that the two first wire guides 218 are opposite to the two parallel wire guides 215 on the parallel wire section 214.

[0047] Insert the end of the welding wire 225 on the wire feed spool 224 into the corresponding side wire feed tube 213 and exit from the first wire guide 218 or the second wire guide 219 into the second limiting groove 408 to reach below the welding nozzle 407. Then, press the welding wire 225 into the wire groove 207 on the corresponding wire feed wheel 206 under the action of the corresponding pressure roller 212.

[0048] Then, the frame 101 is placed at the welding gap of the plate workpiece, and the two traveling wheels 128 are respectively located on the workpiece on both sides of the two welding gaps, so that the welding nozzle 407 is opposite to the welding gap and the welding wire 225 is located on the welding gap.

[0049] Next, the handle 108 is swung backward and the first spring 110 is compressed, so that the handle 108 abuts against the second limit rod 105. The angle between the handle 108 and the plane containing the central axis of the first fixed shaft 102 and the central axis of the second fixed shaft 103 is less than 90 degrees. The handle 108 drives the two auxiliary arms 115 to swing in the same direction and amplitude through the first bushing 107, the two first pulleys 111, the two first synchronous belts 112, the two second pulleys 113 and the second bushing 114, so that the two auxiliary wheels 117 abut against the two workpieces respectively. At this time, the handle 108 is in a horizontal state and the first fixed shaft 102 is located above and in front of the second fixed shaft 103. The wire brush bristles 122 on the cleaning wheel 121 contact and abut against the area near the weld gap of the two workpieces, ensuring the stability of the frame 101 and that the cleaning wheel 121 can effectively roughen and clean the area near the weld gap of the two workpieces, thereby ensuring that the distance between the welding nozzle 407 and the weld gap remains constant.

[0050] Pressing down the handle 108 and moving the frame 101 backward drives the laser welding gun 400 to weld the workpiece. The two traveling wheels 128 drive the two wire feeding wheels 206 to rotate in the same direction. The two wire feeding wheels 206 continuously feed wire to the weld point below the welding nozzle 407. The two auxiliary wheels 117 drive the cleaning wheel 121 to rotate rapidly, and the rotation direction of the cleaning wheel 121 is opposite to the rotation direction of the auxiliary wheels 117. The cleaning wheel 121 drives the wire brush 122 to roughen the area near the weld seam of the two workpieces to prevent the reflection of the highly reflective material workpiece from damaging the laser.

[0051] During the welding process, the first motor 414 and the second motor 505 are started. The first motor 414 drives the spiral blades 411 inside the exhaust sleeve 404 to rotate rapidly and send air to the inner wall of the guide cone sleeve 406. The guide cone sleeve 406 sends the air into the welding nozzle 407 and effectively prevents welding fumes from entering the welding nozzle 407. At the same time, the second motor 505 drives the blades 507 to generate negative pressure in the negative pressure cylinder 501. The two fume hoods 504 generate negative pressure and absorb the fumes generated at the welding nozzle 407, which are then discharged through the exhaust pipe 502 to the fume recovery equipment.

Claims

1. A handheld laser welding device for laser welding, characterized in that, include: A laser welding gun is used for laser welding. The laser welding gun includes a gun body and a gun barrel disposed at the end of the cavity. The end of the gun barrel is provided with a welding nozzle assembly to prevent fumes from entering the gun body through the gun barrel and damaging the optical lens. A support assembly for mounting a laser welding gun includes a frame, on which a first fixed shaft and a second fixed shaft are arranged vertically. A first bushing is rotatably mounted on the first fixed shaft, and a handle is mounted on the first bushing. Both ends of the second fixed shaft are provided with traveling wheels via fourth bushings. A second bushing, which is rotatably connected to the first bushing, is rotatably mounted in the middle of the second fixed shaft. Two auxiliary arms, parallel to the handle and swinging in the same direction as the handle, are symmetrically arranged on the second bushing. The movable ends of the auxiliary arms are provided with auxiliary wheels via first wheel axles, and the diameter of the auxiliary wheels is equal to the diameter of the traveling wheels. The wire feeding assembly installed on the frame is used to continuously feed single-strand or double-strand welding wire to the welding point by means of the rotation of the walking wheels. The wire feeding assembly includes two wire feeding discs installed at both ends of the first fixed shaft and a wire feeding structure that continuously feeds the welding wire on a single wire feeding disc or the welding wire on both wire feeding discs at the same time to the welding point. The fume extraction unit, mounted on the frame, is used to extract and recover the metal fumes generated at the welding point from both sides of the welding nozzle assembly.

2. The handheld laser welding equipment according to claim 1, characterized in that, The welding nozzle assembly includes a connecting sleeve threaded to the end of the gun barrel. An exhaust sleeve is connected to the end of the connecting sleeve. The exhaust sleeve is connected to the welding nozzle head via a guide cone sleeve. A second limiting groove is provided on the outer side of the end of the welding nozzle head to guide a single-strand or double-strand welding wire to the welding point. An annular seat is provided inside the exhaust sleeve. An annular plate is rotatably provided on the annular seat. A gear ring is provided on the annular plate. The gear ring meshes with the fifth gear on the output shaft of the first motor outside the connecting sleeve. An annular sleeve is provided on the annular plate. A plurality of spiral blades are evenly arranged circumferentially on the inner wall of the annular sleeve, which are coaxial with the connecting sleeve and do not obstruct the laser.

3. The handheld laser welding equipment according to claim 1, characterized in that, The handle is provided with a guide ring coaxial with the first fixed shaft. The guide ring rotates within an arc-shaped first guide sleeve on the frame. The guide ring is provided with a first spring connecting the first guide sleeve and the handle, causing the handle to swing to the plane containing the central axes of the first and second fixed shafts. The frame is provided with a first limiting rod and a second limiting rod to limit the swing amplitude of the handle. A second wheel shaft connects the two auxiliary arms. A third bushing, which is rotatably connected to the two first wheel shafts, is mounted on the second wheel shaft. A cleaning wheel is mounted on the third bushing. The rim of the cleaning wheel is densely covered with steel wire bristles that mate with the workpiece.

4. The handheld laser welding equipment according to claim 3, characterized in that, Both ends of the first bushing are provided with first pulleys. The first pulleys are connected to the second pulleys provided on the corresponding side ends of the second bushing via a first synchronous belt. The swing amplitude of the handle and the auxiliary arm is greater than 90 degrees and the swing amplitudes of the two are equal.

5. A handheld laser welding device according to claim 4, characterized in that, The transmission ratio between the first pulley and the second pulley is 1:

1.

6. A handheld laser welding device according to claim 3, characterized in that, The third bushing has two first gears symmetrically arranged at both ends. The first gear meshes with the second gear arranged on the corresponding side auxiliary arm. The second gear meshes with the third gear arranged on the corresponding side auxiliary arm. The third gear meshes with the fourth gear arranged on the corresponding side first wheel shaft. The transmission ratio between the fourth gear and the corresponding side first gear is less than 1.

7. A handheld laser welding device according to claim 2 or 3, characterized in that, The wire feeding structure includes two wire feeding tubes symmetrically arranged on both sides of the frame, guiding the welding wire on the corresponding wire feeding reels to the second limiting groove below the welding nozzle. The wire feeding reels are limited by positioning nuts threaded to the corresponding ends of the first fixed shaft. Welding wire is wound on the wire feeding reels. The ends of the two wire feeding tubes are connected to a wire paralleling section. The wire paralleling section is provided with two wire paralleling channels that guide a single strand of welding wire on one side or a double strand of welding wire on both sides to be nearly centered and guided to the area directly below the nozzle. A wire exit head is slidably arranged on the arc surface of the end of the wire paralleling section around its central axis. The wire exit head is provided with two first wire guide channels that correspond one-to-one with the wire paralleling channels and further guide the double strand of welding wire to be nearly centered and guided into the second limiting groove, and a second wire guide channel that further guides a single strand of welding wire in any wire paralleling channel to be further centered and guided into the second limiting groove. Both sides of the wire exit head are provided with first limiting grooves on the corresponding sides of the wire paralleling section for limiting the wire paralleling section. A limiting block for the oscillation amplitude of the wire head is produced. A fixing pin with the same central axis as the arc surface of its end is provided on the lower side of the wire feeding part. A swing arm connected to the wire outlet is rotatably provided on the fixing pin and a first locking nut for locking the swing arm is threadedly connected. The wire feeding assembly also includes two third wheel shafts symmetrically arranged on both sides of the frame and parallel to the first fixed shaft, and two second guide sleeves corresponding to the third wheel shafts. A fifth shaft sleeve is rotatably provided on the third wheel shaft and is drivenly connected to the fourth shaft sleeve on the corresponding side. A wire feeding wheel is provided on the fifth shaft sleeve to guide the welding wire on the wire feeding disc on the corresponding side to the wire feeding tube on the corresponding side. An annular wire groove for accommodating the welding wire is provided on the rim of the wire feeding wheel. A first push rod slides in the two second guide sleeves and is provided with a second spring for extending the first push rod. The end of the first push rod is provided with a pressure roller through the fourth wheel shaft to press the welding wire on the corresponding side into the wire groove on the corresponding wire feeding wheel.

8. A handheld laser welding device according to claim 7, characterized in that, The fifth bushing is provided with a fourth pulley, which is connected to a third pulley provided on the corresponding side fourth bushing via a second synchronous belt. The radius ratio of the fourth pulley to the wire groove on the corresponding wire feeding wheel is equal to the radius ratio of the corresponding third pulley to the corresponding side traveling wheel.

9. A handheld laser welding device according to claim 1, characterized in that, The frame is equipped with a clamping assembly for fixing the laser welding gun body at an angle. The clamping assembly includes two third guide sleeves symmetrically arranged on both sides of the frame and on the same central axis. A second push rod slides horizontally inside the third guide sleeve and a second locking nut is rotatably provided and threadedly connected to the second push rod. The ends of the two second push rods are provided with two clamps for holding the laser welding gun body.

10. A handheld laser welding device according to claim 1, characterized in that, The fumigation assembly includes a negative pressure cylinder and two fumigation hoods symmetrically arranged on both sides of the frame. The two fumigation hoods are respectively located above the welding nozzles on both sides. Both fumigation hoods are connected to one end of the negative pressure cylinder through a negative pressure pipe. The other end of the negative pressure cylinder is connected to the smoke and dust recovery equipment through a smoke exhaust pipe. Several blades are arranged inside the negative pressure cylinder through a rotating shaft. The rotating shaft is connected to the output shaft of a second motor outside the negative pressure cylinder.

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