Hand-held laser welding machine for sheet metal

Abstract

This invention discloses a handheld laser welding machine for sheet metal work, relating to the field of handheld laser welding machine technology. The machine includes a welding machine; a housing is fixedly mounted on one side wall of the welding machine; a drive assembly is disposed inside the housing; the drive assembly includes a drive motor; the drive motor is fixedly mounted on the side plate of the welding machine; the output shaft of the drive motor extends into the housing; a ratchet is fitted onto the output shaft; a mounting sleeve is fixedly mounted on the outside of the ratchet; a partition is integrally formed on the inner side of the mounting sleeve and the side furthest from the drive motor; a mounting groove for mounting a torsion spring is formed on the inner wall of the mounting sleeve; a laser welding gun is connected to the welding machine via a wire; a wire winding wheel is placed on the mounting sleeve outside the ratchet; the insertion post is aligned with the arc-shaped groove formed on the side wall of the wire winding wheel; at this time, the mating post and the arc-shaped plate inside the wire winding wheel are respectively positioned on the upper and lower sides of the top arc-shaped segment of the torsion spring, drawing the welding wire on the wire winding wheel into a guide tube, preventing the welding wire from bending during transmission.

Description

Technical Field

[0001] This invention specifically relates to the field of handheld laser welding machine technology, and more specifically to a handheld laser welding machine for sheet metal. Background Technology

[0002] Sheet metal processing is a core basic process in modern manufacturing, widely used in automobiles, medical devices, aerospace and other fields. Welding, as a key process for sheet metal connection, directly determines the competitiveness of products in terms of quality and efficiency. Traditional sheet metal welding processes mainly include argon arc welding, carbon dioxide gas shielded welding and resistance welding, which generally have defects such as large heat input, wide heat-affected zone, severe workpiece deformation, poor weld formation and complicated post-processing. In addition, they are highly dependent on the skills of operators and cannot meet the processing needs of modern manufacturing for lightweight and high-precision sheet metal parts.

[0003] With breakthroughs in fiber laser technology, handheld laser welding machines have emerged, gradually being applied to sheet metal processing due to their advantages such as high energy density, small heat-affected zone, and minimal welding deformation, thus solving some of the pain points of traditional processes. However, existing handheld laser welding machines for sheet metal still face several technical bottlenecks: In terms of heat dissipation, water-cooled equipment is not portable and is difficult to maintain, while air-cooled equipment experiences increased heat dissipation pressure with increasing power, affecting equipment stability; in terms of welding quality, high precision is required for workpiece assembly, and weld consistency is insufficient during mass production, with defects such as incomplete penetration easily occurring in thick plate welding; in terms of ergonomics and safety, the heavy welding torch can easily lead to operator fatigue, and the safety protection mechanism is inadequate, resulting in a high operating threshold; in terms of intelligence and functional integration, the lack of real-time weld quality monitoring, adaptive parameter adjustment, and data traceability functions makes it difficult to adapt to the needs of modern production management. In traditional laser welding machines, there may be a gap between the welding wire and the welding gun during the welding process, which may affect the welding efficiency. Furthermore, traditional welding machines do not automatically separate the welding wire from the sheet metal after welding, resulting in residue on the sheet metal and causing clumps to form, which affects the welding quality. Chinese patent application CN202420662850.7 discloses a handheld laser welding machine with good stability; it includes a welding machine body, a laser head body and a mounting assembly mounted on the surface of the welding machine body, and a wire feeding tube detachably connected to the surface of the mounting assembly. It also includes: a fixing plate fixedly connected to the top of the welding machine body, a support mechanism mounted on the bottom of the fixing plate, an adjustment mechanism provided on the top of the fixing plate, a horizontal plate fixedly connected to the bottom of the adjustment mechanism, a vertical plate and a hollow frame fixedly connected to the two sides of the bottom of the horizontal plate, a rotating mechanism provided inside the hollow frame, a rotating plate fixedly sleeved on the surface of the rotating mechanism, a slot provided on the surface of the rotating plate, and the inner wall of the slot contacting the surface of the wire feeding tube. While the device in the aforementioned patent can achieve the effect of laser welding, it does not describe how the wire feeding tube transmits the welding wire. As a result, when the exposed length of the welding wire in the wire feeding tube is long, clumps will appear at both ends of the weld during welding, which will affect the welding quality. The device in the aforementioned patent cannot achieve automatic separation between the welding wire and the weld, which will cause excess molten welding wire to clump on the sheet metal. Summary of the Invention

[0004] The purpose of this invention is to provide a handheld laser welding machine for sheet metal work. In this device, the laser welding gun is connected to the control system inside the welding machine via a wire. A wire-winding wheel with welding wire wound on it is installed on a mounting sleeve. The drive motor is connected to the control system inside the welding machine. Since the laser welding gun's switch trigger is two-stage, when the first stage is pressed, the welding machine enables the laser welding gun to generate laser light; when the second stage of the switch trigger is pressed, the drive motor rotates the wire-winding wheel via a ratchet. At this time, the torsion spring inside the mounting sleeve cooperates with the mating post and arc-shaped plate inside the wire-winding wheel to achieve… The current method involves compressing and storing the torsion spring, while simultaneously moving the insert inside the arc-shaped groove from one end to the other. This prevents the wire winding wheel from reversing. The rotation of the wire winding wheel transmits the welding wire through the guide tube and between the roller and pressure roller into the wire feeding tube. When the second stage of the switch trigger is released, the drive motor stops rotating, and the torsion spring inside the mounting sleeve reverses the wire winding wheel upon resetting, thus pulling the welding wire inside the wire outlet backward and separating the welding wire from the sheet metal. Releasing the first stage of the switch trigger then stops the laser. This method addresses the problems mentioned in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A handheld laser welding machine for sheet metal work includes a welding machine; a housing is fixedly mounted on one side wall of the welding machine; a drive assembly is disposed inside the housing; the drive assembly includes a drive motor; the drive motor is fixedly mounted on the side plate of the welding machine; the output shaft of the drive motor extends into the housing; a ratchet is fitted onto the output shaft; a mounting sleeve is fixedly mounted on the outside of the ratchet; a partition is integrally formed on the inner side of the mounting sleeve and the end away from the drive motor; a mounting groove for mounting a torsion spring is formed on the inner wall of the mounting sleeve; the end of the torsion spring away from the mounting groove is arc-shaped; the arc shape is coaxial with the mounting sleeve. The welding machine has a sliding plate fixedly installed on the side plate where the drive motor is mounted; an arc-shaped slider is movably installed inside the side of the sliding plate away from the side plate; a pin is fixedly installed on the arc-shaped slider; the sliding plate is coaxially arranged with the output shaft of the drive motor.

[0006] As a further technical solution of the present invention, a winding wheel is detachably mounted on the mounting sleeve; an arc-shaped groove is provided on one side wall of the winding wheel; the arc-shaped groove is engaged with the insertion post on the arc-shaped slider; a mating post is coaxially arranged inside the winding wheel; an arc-shaped plate is provided at the bottom of the mating post; the mating post and the arc-shaped plate are engaged with the torsion spring inside the mounting sleeve.

[0007] As a further technical solution of the present invention, two support frames are also fixedly installed inside the bottom plate of the box; a roller is movably installed on the top of the support frame through a rotating shaft; a guide tube is provided between one of the rollers and the winding wheel; the two ends of the guide tube are respectively flush with the top of the roller and the bottom of the winding wheel.

[0008] As a further technical solution of the present invention, a pressure roller is provided above each of the two rollers; the pressure roller is movably installed on the slider via a support rod; the slider is slidably installed on the slide rail; the slide rail is fixedly installed on the mounting plate; the mounting plate is fixedly installed on the side plate of the welding machine.

[0009] As a further technical solution of the present invention, a wire feeding tube is detachably installed at one end of the housing; the wire feeding tube is wound around a second take-up reel; a first take-up reel is also provided on one side of the second take-up reel; a wire is wound on the first take-up reel; the first take-up reel and the second take-up reel are both movably installed on the housing of the welding machine via a rotating shaft.

[0010] As a further technical solution of the present invention, a hook is fixedly installed on the side wall of the welding machine away from the housing; the hook is inclined; a laser welding gun is placed on the hook; the end of the laser welding gun and the wire are detachably installed.

[0011] As a further technical solution of the present invention, the other end of the laser welding gun is detachably equipped with an installation head; the end of the installation head away from the laser welding gun has a notch; the installation head is also fixedly equipped with an installation bracket; the installation bracket is L-shaped; the bottom of the installation bracket is fixedly equipped with a wire outlet head; the end of the wire outlet head away from the installation bracket extends into the notch at the end of the installation head; the other end of the wire outlet head is detachably installed to the end of the wire feeding tube away from the housing via a thread.

[0012] As a further technical solution of the present invention, the internal controller of the welding machine is electrically connected to the wire and the drive motor respectively; wherein, the laser welding gun switch trigger connected by the wire is a two-stage type.

[0013] Compared with the prior art, the beneficial effects of the present invention are: In this invention, when in use, the laser welding gun is connected to the welding machine via a wire, the wire winding wheel is placed on the mounting sleeve outside the ratchet, and the insertion post is aligned with the arc-shaped groove opened on the side wall of the wire winding wheel. At this time, the mating post and the arc-shaped plate inside the wire winding wheel are respectively positioned on the upper and lower sides of the top arc-shaped section of the torsion spring, and the welding wire on the wire winding wheel is pulled into the guide tube. The guide tube prevents the welding wire from bending during the transmission process. In this invention, during the transmission of welding wire, the wire feeding tube is threadedly connected to the wire outlet, and the welding wire passes between two sets of rollers and pressure rollers. The pressure rollers slide up and down along the slide rail via support rods and sliders. In this way, the welding wire can be straightened during the transmission process, avoiding bending of the welding wire during transmission and affecting the efficiency of welding wire transmission. In this invention, during welding, pressing the first stage of the laser welding gun's switch trigger powers the laser welding gun to emit light through the welding machine's internal control system. Pressing the second stage sends a signal to the controller via the laser welding gun, which then drives the motor to operate. The motor drives the ratchet to rotate, and the mounting sleeve on the ratchet drives the wire winding wheel to rotate. When the wire winding wheel rotates, the mating post and arc plate inside the wire winding wheel engage with the torsion spring, applying pressure to the torsion spring and storing its force. At this time, the insert post in the arc groove on the side wall of the wire winding wheel moves from one end of the arc groove to the other end, blocking the wire winding wheel and preventing it from automatically reversing. The insert post rotates along the sliding plate via the arc slider. In this invention, after welding is completed, the operator releases the second stage of the laser welding gun switch trigger. At this time, the control system stops the drive motor from rotating. The torsion spring inside the mounting sleeve loses its pressure. During the reset process, the torsion spring reverses the winding wheel, thereby pulling the welding wire in the wire outlet backward, achieving separation of the welding wire from the laser and sheet metal generated by the laser welding gun. Then, the first stage of the laser welding gun switch trigger is released to turn off the laser of the laser welding gun. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 In this invention Figure 1 Another perspective structural diagram.

[0016] Figure 3 In this invention Figure 2 Schematic diagram of the internal structure assembly of the middle box.

[0017] Figure 4 In this invention Figure 3 Another perspective structural diagram.

[0018] Figure 5 In this invention Figure 1 Schematic diagram of the internal structure of the welding machine.

[0019] Figure 6 In this invention Figure 2 Another structural diagram of the middle box.

[0020] Figure 7 In this invention Figure 6 Another perspective structural diagram.

[0021] Figure 8 In this invention Figure 7 Main view of a partial structure in the middle.

[0022] Figure 9 In this invention Figure 8 Sectional view of AA.

[0023] Figure 10 In this invention Figure 8 Another perspective on the breakdown diagram.

[0024] Figure 11 In this invention Figure 10 Another perspective of the winding wheel.

[0025] Figure 12 This is the present invention. Figure 1 A three-dimensional structural diagram of a laser welding gun.

[0026] Figure 13 In this invention Figure 4 Enlarged view of section B in the middle.

[0027] Figure 14 In this invention Figure 10 Schematic diagram of the installation of the torsion spring.

[0028] In the diagram: 1-Welding machine, 2-Laser welding gun, 3-Hook, 4-Wire, 5-First winding wheel, 6-Second winding wheel, 7-Wire feed tube, 8-Box, 9-Support frame, 10-Roller, 11-Guide tube, 12-Wire winding wheel, 13-Pressure wheel, 14-Drive assembly, 140-Drive motor, 141-Ratchet, 142-Baffle, 143-Torsion spring, 144-Mounting groove, 145-Mounting sleeve, 15-Slide plate, 16-Mounting plate, 17-Arc groove, 18-Arc slider, 19-Pin post, 20-Matching post, 21-Arc plate, 22-Mounting bracket, 23-Wire exit head, 24-Slider, 25-Slide rail. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-10 In this embodiment of the invention, a handheld laser welding machine for sheet metal includes a welding machine 1; a housing 8 is fixedly installed on one side wall of the welding machine 1; a drive assembly 14 is disposed inside the housing 8; the drive assembly 14 includes a drive motor 140; the drive motor 140 is fixedly installed on the side plate of the welding machine 1; the output shaft of the drive motor 140 extends into the housing 8; a ratchet 141 is fitted on the output shaft; a mounting sleeve 145 is fixedly installed on the outside of the ratchet 141; a partition 142 is integrally disposed on the inner side of the mounting sleeve 145 and the end away from the drive motor 140; a mounting groove 144 for mounting a torsion spring 143 is formed on the inner wall of the mounting sleeve 145; the end of the torsion spring 143 away from the mounting groove 144 is arc-shaped; the arc shape is coaxial with the mounting sleeve 145. The welding machine 1 is equipped with a slide plate 15 fixedly mounted on the side plate on which the drive motor 140 is installed; an arc-shaped slider 18 is movably mounted inside the side of the slide plate 15 away from the side plate; a pin 19 is fixedly mounted on the arc-shaped slider 18; the slide plate 15 is coaxially arranged with the output shaft of the drive motor 140. A winding wheel 12 is detachably mounted on the mounting sleeve 145; an arc-shaped groove 17 is provided on one side wall of the winding wheel 12; the arc-shaped groove 17 is inserted into and cooperates with the insertion post 19 on the arc-shaped slider 18; a coaxial mating post 20 is provided inside the winding wheel 12; an arc-shaped plate 21 is provided at the bottom of the mating post 20; the mating post 20 and the arc-shaped plate 21 cooperate with the torsion spring 143 inside the mounting sleeve 145.

[0031] By adopting the above technical solution, when using the laser welding gun 2, it is connected to the welding machine 1 through the wire 4. The wire winding wheel 12 is placed on the mounting sleeve 145 outside the ratchet 141. The insertion post 19 is aligned with the arc groove 17 opened on the side wall of the wire winding wheel 12. At this time, the mating post 20 and the arc plate 21 inside the wire winding wheel 12 are respectively positioned on the upper and lower sides of the top arc section of the torsion spring 143. The welding wire on the wire winding wheel 12 is pulled into the guide tube 11. The guide tube 11 prevents the welding wire from bending during the transmission process.

[0032] In this embodiment, two support frames 9 are also fixedly installed inside the bottom plate of the box body 8; a roller 10 is movably installed on the top of the support frame 9 through a rotating shaft; a guide tube 11 is provided between one of the rollers 10 and the winding wheel 12; the two ends of the guide tube 11 are flush with the top of the roller 10 and the bottom of the winding wheel 12, respectively. In this embodiment, a pressure roller 13 is provided above each of the two rollers 10; the pressure roller 13 is movably installed on the slider 24 via a support rod; the slider 24 is slidably installed on the slide rail 25; the slide rail 25 is fixedly installed on the mounting plate 16; the mounting plate 16 is fixedly installed on the side plate of the welding machine 1. By adopting the above technical solution, when the welding wire is transmitted, the wire feeding tube 7 is threadedly connected to the wire outlet 23, and the welding wire passes between two sets of rollers 10 and pressure rollers 13. The pressure rollers 13 slide up and down along the slide rail 25 through the support rod and the slider 24. In this way, the welding wire can be straightened during the transmission process, avoiding bending of the welding wire during transmission and affecting the efficiency of the welding wire transmission.

[0033] Furthermore, a wire feeding tube 7 is detachably installed at one end of the housing 8; the wire feeding tube 7 is wound around the second take-up reel 6; a first take-up reel 5 is also provided on one side of the second take-up reel 6; a wire 4 is wound around the first take-up reel 5; the first take-up reel 5 and the second take-up reel 6 are both movably installed on the housing of the welding machine 1 via a rotating shaft. In this embodiment, a hook 3 is fixedly installed on the side wall of the welding machine 1 away from the housing 8; the hook 3 is inclined; a laser welding gun 2 is placed on the hook 3; the end of the laser welding gun 2 is detachably installed from the wire 4. By adopting the above technical solution, during welding, pressing the first stage of the switch trigger of the laser welding gun 2 powers on the laser welding gun 2 and emits light through the control system inside the welding machine 1. Pressing the second stage sends a signal to the controller through the laser welding gun 2, and the controller drives the drive motor 140 to work. The drive motor 140 drives the ratchet 141 to rotate. The mounting sleeve 145 installed on the ratchet 141 drives the wire winding wheel 12 to rotate. When the wire winding wheel 12 rotates, the mating post 20 and the arc plate 21 inside the wire winding wheel 12 cooperate with the torsion spring 143 to apply pressure to the torsion spring 143 and store force in the torsion spring 143. At this time, the insert post 19 in the arc groove 17 opened on the side wall of the wire winding wheel 12 moves from one end of the arc groove 17 to the other end, blocking the wire winding wheel 12 and preventing the wire winding wheel 12 from automatically reversing. The insert post 19 rotates along the slide plate 15 through the arc slider 18.

[0034] Please see Figure 7-14In this embodiment, the other end of the laser welding gun 2 is detachably equipped with an installation head; the end of the installation head away from the laser welding gun 2 has a notch; an installation frame 22 is also fixedly installed on the installation head; the installation frame 22 is L-shaped; a wire outlet head 23 is fixedly installed at the bottom of the installation frame 22; the end of the wire outlet head 23 away from the installation frame 22 extends into the notch at the end of the installation head; the other end of the wire outlet head 23 is detachably installed to the end of the wire feeding tube 7 away from the housing 8 via a thread; The internal controller of the welding machine 1 is electrically connected to the wire 4 and the drive motor 140 respectively; wherein, the laser welding gun 2 switch trigger connected by the wire 4 is a two-stage type; By adopting the above technical solution, after welding is completed, the operator releases the second stage of the laser welding gun 2 switch trigger. At this time, the control system stops the drive motor 140 from rotating. At this time, the torsion spring 143 inside the mounting sleeve 145 loses pressure. During the reset process, the torsion spring 143 reverses the winding wheel 12, thereby pulling the welding wire in the wire outlet 23 backward, realizing the separation of the welding wire from the laser and sheet metal generated by the laser welding gun 2. Then, the first stage of the laser welding gun 2 switch trigger is released to turn off the laser of the laser welding gun 2.

[0035] The working principle of this invention is as follows: When in use, the laser welding gun 2 is connected to the welding machine 1 through the wire 4, the wire winding wheel 12 is placed on the mounting sleeve 145 outside the ratchet 141, and the insertion post 19 is aligned with the arc groove 17 opened on the side wall of the wire winding wheel 12. At this time, the mating post 20 and the arc plate 21 inside the wire winding wheel 12 are respectively positioned on the upper and lower sides of the top arc section of the torsion spring 143, and the welding wire on the wire winding wheel 12 is pulled into the guide tube 11. The guide tube 11 prevents the welding wire from bending during the transmission process. During the wire transfer, the wire feeding tube 7 is threadedly connected to the wire outlet 23, and the wire passes between two sets of rollers 10 and pressure rollers 13. The pressure rollers 13 slide up and down along the slide rail 25 through the support rod and the slider 24. In this way, the wire can be straightened during the wire transfer process, avoiding bending of the wire during the transfer process and affecting the efficiency of wire transfer. During welding, pressing the first switch of the laser welding gun 2 powers on the laser welding gun 2 and illuminates it through the control system inside the welding machine 1. Pressing the second switch sends a signal to the controller through the laser welding gun 2, which then drives the drive motor 140 to work. The drive motor 140 drives the ratchet 141 to rotate. The mounting sleeve 145 on the ratchet 141 drives the wire winding wheel 12 to rotate. When the wire winding wheel 12 rotates, the mating post 20 and the arc plate 21 inside the wire winding wheel 12 engage with the torsion spring 143 to apply pressure to the torsion spring 143 and store its force. At this time, the insert post 19 in the arc groove 17 on the side wall of the wire winding wheel 12 moves from one end of the arc groove 17 to the other end, blocking the wire winding wheel 12 and preventing the wire winding wheel 12 from automatically reversing. The insert post 19 rotates along the slide plate 15 via the arc slider 18. After welding is completed, the operator releases the second stage of the laser welding gun 2 switch trigger. At this time, the control system stops the drive motor 140 from rotating. The torsion spring 143 inside the mounting sleeve 145 loses pressure. During the reset process, the torsion spring 143 reverses the winding wheel 12, thereby pulling the welding wire in the wire outlet 23 backward, realizing the separation of the welding wire from the laser and sheet metal generated by the laser welding gun 2. Then, the first stage of the laser welding gun 2 switch trigger is released to turn off the laser of the laser welding gun 2. When welding again, the second stage of the laser welding gun 2 switch trigger is turned on, which drives the drive motor 140 to drive the wire winding wheel 12, thereby achieving the effect of cyclic welding.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hand-held laser welder for sheet metal, comprising a welder (1); characterized in that: A housing (8) is fixedly installed on one side wall of the welding machine (1); a drive assembly (14) is provided inside the housing (8); the drive assembly (14) includes a drive motor (140); the drive motor (140) is fixedly installed on the side plate of the welding machine (1); the output shaft of the drive motor (140) extends into the housing (8); a ratchet (141) is fitted on the output shaft; an mounting sleeve (145) is fixedly installed on the outside of the ratchet (141); a partition (142) is integrally provided on the inner side of the mounting sleeve (145) and the end away from the drive motor (140); an mounting groove (144) for mounting a torsion spring (143) is provided on the inner wall of the mounting sleeve (145); the end of the torsion spring (143) away from the mounting groove (144) is arc-shaped; the arc is coaxial with the mounting sleeve (145); The welding machine (1) is equipped with a slide plate (15) fixedly mounted on the side plate of the drive motor (140); an arc-shaped slider (18) is movably mounted inside the side of the slide plate (15) away from the side plate; a plug (19) is fixedly mounted on the arc-shaped slider (18); the slide plate (15) is coaxially arranged with the output shaft of the drive motor (140).

2. The handheld laser welding machine for sheet metal according to claim 1, characterized in that: The mounting sleeve (145) is detachably mounted with a winding wheel (12); an arc-shaped groove (17) is provided on one side wall of the winding wheel (12); the arc-shaped groove (17) is inserted into the insertion post (19) on the arc-shaped slider (18); a mating post (20) is coaxially arranged inside the winding wheel (12); an arc-shaped plate (21) is provided at the bottom of the mating post (20); the mating post (20) and the arc-shaped plate (21) are mated with a torsion spring (143) inside the mounting sleeve (145).

3. The handheld laser welding machine for sheet metal according to claim 1, characterized in that: The bottom plate of the box (8) is also fixedly installed with two support frames (9); the top of the support frame (9) is movably installed with a roller (10) through a rotating shaft; a guide tube (11) is provided between one of the rollers (10) and the winding wheel (12); the two ends of the guide tube (11) are flush with the top of the roller (10) and the bottom of the winding wheel (12) respectively.

4. The hand-held laser welder for sheet metal according to claim 3, characterized in that: A pressure roller (13) is provided above each of the two rollers (10); the pressure roller (13) is movably installed with the slider (24) via a support rod; the slider (24) is slidably installed on the slide rail (25); the slide rail (25) is fixedly installed on the mounting plate (16); the mounting plate (16) is fixedly installed with the side plate of the welding machine (1).

5. The hand-held laser welder for sheet metal according to claim 4, characterized in that: The housing (8) is detachably equipped with a wire feeding tube (7) at one end; the wire feeding tube (7) is wound around the second take-up wheel (6); a first take-up wheel (5) is also provided on one side of the second take-up wheel (6); a wire (4) is wound around the first take-up wheel (5); the first take-up wheel (5) and the second take-up wheel (6) are both movably installed on the housing of the welding machine (1) through a rotating shaft.

6. The hand-held laser welder for sheet metal according to claim 5, characterized in that: The welding machine (1) is fixedly installed with a hook (3) on the side wall away from the box (8); the hook (3) is set at an angle; a laser welding gun (2) is placed on the hook (3); the end of the laser welding gun (2) and the wire (4) are detachably installed.

7. The hand-held laser welder for sheet metal according to claim 6, characterized in that: The other end of the laser welding gun (2) is detachably equipped with an installation head; the end of the installation head away from the laser welding gun (2) has a notch; the installation head is also fixedly equipped with an installation frame (22); the installation frame (22) is L-shaped; the bottom of the installation frame (22) is fixedly equipped with a wire outlet head (23); the end of the wire outlet head (23) away from the installation frame (22) extends into the notch at the end of the installation head; the other end of the wire outlet head (23) is detachably installed with the end of the wire feeding tube (7) away from the housing (8) via a thread.

8. The hand-held laser welder for sheet metal according to claim 7, characterized in that: The internal controller of the welding machine (1) is electrically connected to the wire (4) and the drive motor (140) respectively; wherein the laser welding gun (2) switch trigger connected by the wire (4) is a two-stage type.

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