Laser welding equipment for aluminum profile door and window production

Abstract

The invention relates to the technical field of metal welding, and discloses laser welding equipment for aluminum profile door and window production. Comprising a welding gun, a laser transmitting tube fixedly installed at a muzzle of the welding gun, a wire feeding gun rotationally installed on a gun body of the welding gun, a first hose fixedly installed at one end of the wire feeding gun and a wire feeding mechanism connected with the end, away from the wire feeding gun, of the first hose, and a conical groove allowing a welding wire to pass through is formed in the end, close to the first hose, of the wire feeding gun. A wire stabilizing mechanism is arranged in the wire feeding gun and comprises a plurality of split clamping plates capable of sliding in the radial direction of the wire feeding gun, and arc-shaped guide faces allowing welding wires to penetrate through are formed in the inner walls of the split clamping plates. A sensing mechanism located in front of the split clamping plate is further arranged in the wire feeding gun. The device can automatically adjust the contraction degree of the split clamping plates according to the change of the wire feeding speed, can automatically loosen at a low speed to reduce the wire feeding resistance and prevent welding wires from being stacked or scratched on the surface, and can automatically tighten at a high speed to provide enough damping and rigidity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal welding, and particularly relates to a laser welding device for aluminum profile door and window production. BACKGROUND

[0002] With the continuous improvement of building energy saving and personalized decoration demand, aluminum alloy profiles are widely used in the field of door and window manufacturing due to their light weight, high strength, corrosion resistance and easy forming. In recent years, in the manufacturing of metal cutting and welding equipment, laser welding technology has gradually become the mainstream process in the production of aluminum profile doors and windows due to its high energy density, fast welding speed, small heat-affected zone and beautiful weld.

[0003] In the laser welding process of aluminum profile doors and windows, the use of filler wire plays a crucial role in improving weld formation, adjusting chemical composition and reducing assembly gap sensitivity. In actual production, due to the large variation of wall thickness of door and window profiles and the various splicing forms (such as corner joint, butt joint, lap joint, etc.), it is often necessary to frequently adjust the welding process parameters according to different working conditions, among which the wire feeding speed is one of the most critical dynamic adjustment parameters. The size of the wire feeding speed directly determines the filling amount of the deposited metal per unit time, which further affects the shape of the molten pool, heat input balance and the final welding quality. In the case of dealing with large assembly gaps, thick plate surfacing or fillet weld reinforcement, a higher wire feeding speed is usually required to achieve high deposition rate and ensure that the weld is full and effectively bridges the gap. However, the increase of wire feeding speed means that the pushing force of the wire feeding mechanism on the wire increases significantly, and the travel speed of the wire inside the hose and gun head increases, and the kinetic energy increases. Under this condition, if the wire itself has a small bend or internal stress, it is easy to cause the wire to produce severe high-frequency vibration or rotation at the outlet of the gun head, causing the wire extension to deviate from the center of the laser spot before entering the molten pool, resulting in incomplete fusion, rough weld ripples and uneven edges.

[0004] The existing Chinese application patent with the publication number CN119237933A discloses an L-shaped laser-MIG composite welding device for narrow space. The invention provides an L-shaped laser-MIG composite welding device for narrow space, which includes a welding gun assembly, a laser welding head assembly and a space adjusting assembly. The invention optimizes the wire feeding route of the welding gun to improve the precision of the wire guide assembly, and combines a three-wheel straightener to ensure the straightness of the wire, achieving the purpose of stable wire feeding.

[0005] However, the three-wheel straightener disclosed in the above-mentioned prior art can correct the wire through the three-point bending principle, but its limitation on the wire mainly relies on local point contact, which is difficult to completely constrain the circumferential rotation and small lateral vibration of the wire during high-speed travel, and is also easy to cause the wire extension to deviate from the center of the laser spot before entering the molten pool, resulting in unstable wire feeding. Summary of the Invention

[0006] Given that the existing technology relies solely on local point contact constraints, which makes it difficult to completely constrain the circumferential rotation and slight lateral vibration of the welding wire during high-speed travel, and which easily leads to the welding wire deviating from the center of the laser spot, a laser welding device for aluminum profile door and window production is proposed.

[0007] This application provides a laser welding equipment for the production of aluminum profile doors and windows. Its purpose is to achieve continuous surface contact constraint and clamping force that is adaptively adjusted according to the thrust through a radially sliding split clamping plate design, so as to effectively suppress the high-speed vibration of the welding wire and ensure its stable alignment with the center of the laser spot.

[0008] The technical solution of the present invention is as follows: a laser welding equipment for the production of aluminum profile doors and windows, comprising a welding torch, a laser emitting tube fixedly installed at the nozzle of the welding torch, a wire feeding torch rotatably installed on the body of the welding torch, a first flexible tube fixedly installed at one end of the wire feeding torch, and a wire feeding mechanism connected to the end of the first flexible tube away from the wire feeding torch. The end of the wire feeding torch near the first flexible tube has a conical groove for the welding wire to pass through. The wire feeding torch is equipped with a wire stabilizing mechanism, which includes multiple split clamps that can slide radially along the wire feeding torch. The inner wall of the split clamps has an arc-shaped guide surface for the welding wire to pass through. The wire feeding torch is also equipped with a sensing mechanism located in front of the split clamps. When the welding wire moves axially along the first flexible tube under the thrust of the wire feeding mechanism, the sensing mechanism senses the wire feeding speed of the wire feeding mechanism and transmits it to the wire stabilizing mechanism to drive the multiple split clamps to retract synchronously in the radial direction of the wire feeding torch, thereby achieving continuous surface contact constraint on the welding wire and forcibly straightening the welding wire.

[0009] Furthermore, a wire feeding tube is fixedly connected to the end of the wire feeding gun away from the first flexible tube, and a wire feeding gun head is fixedly connected to the end of the wire feeding tube. A control block is fixedly connected to the end of the split clamp plate near the sensing mechanism, and an extension plate is fixedly connected to the end of the split clamp plate away from the sensing mechanism, with the extension plate located inside the wire feeding tube.

[0010] Furthermore, the wire stabilizing mechanism also includes a guide rod fixedly installed on the inner wall of the wire feeding gun, a guide groove opened on the outer wall of the split clamp for the guide rod to slide, and a tension spring sleeved on the wall of the guide rod. One end of the tension spring is fixedly connected to the inner wall of the wire feeding gun, and the other end of the tension spring is fixedly connected to the outer wall of the split clamp. The wire stabilizing mechanism also includes a drive ring slidably installed inside the wire feeding gun and a sliding groove opened on the inner wall of the wire feeding gun for guiding the drive ring. The inner wall of the drive ring is inclined, and the inner wall of the drive ring abuts against the end of the control block away from the split clamp.

[0011] Furthermore, the sensing mechanism includes a roller rotatably mounted inside the wire feed gun, and the roller can be driven to rotate when the welding wire moves. The faster the welding wire moves, the greater the distance the drive ring moves towards the control block.

[0012] Furthermore, the sensing mechanism also includes a mounting groove formed on the inner wall of the wire feed gun, a base slidably mounted inside the mounting groove, and a spring piece fixedly mounted on the inner wall of the mounting groove. The axial end of the roller is rotatably connected to the outer wall of the base, and the outer wall of the spring piece abuts against the base.

[0013] Furthermore, the sensing mechanism also includes a rotating shaft fixedly installed on the axial end of the roller, a fixed sleeve fixedly installed on the shaft wall, a T-shaped rod elastically installed inside the fixed sleeve, a centrifugal roller fixedly installed on the end of the T-shaped rod away from the fixed sleeve, a fixed ring fixedly installed on the outer wall of the base, and an air bladder fixedly installed on the inner wall of the fixed ring. The air bladder is filled with hydraulic oil. The end of the rotating shaft away from the roller is rotatably connected to the outer wall of the base. When the roller rotates, the centrifugal roller can squeeze the hydraulic oil inside the air bladder, causing the hydraulic oil to push the drive ring to move.

[0014] Furthermore, the sensing mechanism also includes a return spring disposed inside the fixed sleeve. One end of the return spring is fixedly connected to the rod wall of the rotating shaft, and the other end of the return spring is fixedly connected to the end of the T-shaped rod away from the centrifugal roller.

[0015] Furthermore, the sensing mechanism also includes a second flexible tube fixedly installed on the outer wall of the base and communicating with the inside of the airbag, a connecting groove opened inside the wire feed gun and communicating with the second flexible tube, a main channel opened inside the wire feed gun and communicating with the inside of the connecting groove, and a sliding cylinder slidably installed inside the main channel, with the end of the sliding cylinder fixedly connected to the outer wall of the drive ring.

[0016] Furthermore, the sensing mechanism also includes a bypass channel that is located inside the wire feed gun and communicates with the main channel, a one-way valve located inside the main channel, a piston located inside the bypass channel, a connecting rod fixedly installed on the outer wall of the piston, an adjustment groove located inside the wire feed gun for the piston to slide, and an adjustment block fixedly installed on the end of the connecting rod.

[0017] The beneficial effects of this invention are:

[0018] 1. Through the cooperation of rollers, centrifugal adjustment components and hydraulic transmission, this device can automatically adjust the shrinkage degree of the split clamp according to the change of wire feeding speed. At low speed, it automatically loosens to reduce wire feeding resistance and prevent wire stacking or surface scratches, while at high speed, it automatically tightens to provide sufficient damping and stiffness. This effectively suppresses the radial runout and high-frequency vibration of the welding wire in a wide speed range, solving the problem of unstable wire feeding caused by the inability of traditional wire feeding devices to self-adapt.

[0019] 2. The arc-shaped guide surfaces of multiple split clamps form a continuous surface contact envelope constraint on the welding wire. Combined with the extension plate extending into the wire feeding tube, the effective guiding length of the welding wire is significantly increased. This forces the elimination of the original bending and residual internal stress caused by the coiling of the aluminum welding wire, achieving forced online straightening of the welding wire. This ensures that the welding wire points towards the laser molten pool with extremely high straightness, greatly improving the weld formation quality and welding positioning accuracy.

[0020] 3. Through the design of hydraulic transmission and adjustable bypass channel, not only is the incompressibility of hydraulic oil used to achieve smooth and precise force transmission, but the position of the piston in the bypass channel is also adjusted to give the device flexible adaptability to working conditions, further improving the ease of use and process adaptability of this equipment. Attached Figure Description

[0021] Figure 1 This is a perspective view of the welding torch in this invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the wire feeding gun in this invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a schematic diagram of the installation of the roller in this invention;

[0025] Figure 5 This is a schematic diagram of the installation of the spring clip in this invention;

[0026] Figure 6 This is a cross-sectional view of the fixing sleeve in this invention;

[0027] Figure 7 This is a three-dimensional view of the airbag in this invention;

[0028] Figure 8 This is a perspective view of the split clamping plate in this invention;

[0029] Figure 9 This is a schematic diagram of the installation of the guide groove in this invention;

[0030] Figure 10 This is a schematic diagram showing the connection between the airbag and the second hose in this invention;

[0031] Figure 11 This is a schematic diagram of the installation of the adjusting groove in this invention;

[0032] Figure 12 This is a schematic diagram of the connection between the mounting groove and the base in this invention;

[0033] Figure 13 This is a perspective view of the wire feeding mechanism in this invention.

[0034] In the picture:

[0035] 1. Welding torch; 2. Laser emitter tube; 3. Wire feeder; 4. First flexible hose; 5. Wire feed tube; 6. Wire feeder head; 7. Split clamp; 8. Extension plate; 9. Control block; 10. Guide rod; 11. Guide groove; 12. Tension spring; 13. Drive ring; 14. Slide groove; 15. Roller; 16. Mounting groove; 17. Base; 18. Centrifugal roller; 19. Rotating shaft; 20. Fixing sleeve; 21. T-shaped rod; 22. Return spring; 23. Airbag; 24. Fixing ring; 25. Second flexible hose; 26. Connecting groove; 27. Main channel; 28. One-way valve; 29. ​​Sliding cylinder; 30. Bypass channel; 31. Piston; 32. Connecting rod; 33. Adjusting block; 34. Spring; 35. Conical groove; 36. Wire feed mechanism; 37. Adjusting groove. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Example 1, referring to Figures 1-13 The first embodiment of the present invention provides a laser welding device for the production of aluminum profile doors and windows, comprising a welding torch 1, a laser emitting tube 2 fixedly installed at the nozzle of the welding torch 1, a wire feeding torch 3 rotatably installed on the body of the welding torch 1, a first flexible tube 4 fixedly installed at one end of the wire feeding torch 3, and a wire feeding mechanism 36 connected to the end of the first flexible tube 4 away from the wire feeding torch 3. The end of the wire feeding torch 3 near the first flexible tube 4 has a conical groove 35 for the welding wire to pass through. The wire feeding torch 3 has a wire stabilizing mechanism inside, which includes multiple... A split clamping plate 7 that can slide radially along the wire feed gun 3 has an arc-shaped guide surface on its inner wall for the welding wire to pass through. The wire feed gun 3 is also equipped with a sensing mechanism located in front of the split clamping plate 7. When the welding wire moves axially along the first hose 4 under the action of the thrust of the wire feed mechanism 36, the sensing mechanism senses the wire feeding speed of the wire feed mechanism 36 and transmits it to the wire stabilizing mechanism to drive multiple split clamping plates 7 to retract synchronously in the radial direction of the wire feed gun 3, so as to achieve continuous surface contact constraint on the welding wire and force straighten the welding wire.

[0038] Specifically, the wire feeding mechanism 36 is a common welding wire feeder in the prior art, mainly composed of a housing, a drive motor installed inside the housing, a reduction gear set connected to the drive motor, a drive wire feeding wheel driven by the reduction gear set, a driven clamping wheel opposite to the drive wire feeding wheel for clamping the welding wire, and a bobbin structure located on one side of the housing for supporting the welding wire spool. The drive motor drives the drive wire feeding wheel to rotate through the reduction gear set. The drive wire feeding wheel and the driven clamping wheel work together, using friction to smoothly and continuously push the welding wire on the welding wire spool out and feed it into the first flexible hose 4.

[0039] The tapered groove 35 can guide the welding wire fed from the first hose 4 to the axis of the wire feeder 3. Since the center of the multiple split clamps 7 is collinear with the inner wall axis of the wire feeder 3, the welding wire can enter the middle position of the multiple split clamps 7 after passing through the tapered groove 35.

[0040] The sensing mechanism converts the captured speed parameters into corresponding mechanical or electronic control signals and transmits them directly to the wire stabilizing mechanism, thereby establishing a dynamic response mechanism between the wire feeding speed and the clamping force, ensuring that the device can automatically adjust the constraint state on the welding wire according to different welding conditions.

[0041] Upon receiving the drive signal from the sensing mechanism, multiple split clamping plates 7 can synchronously slide along the radial direction of the wire feed gun 3 and retract towards the center. This radial retraction motion causes multiple arc-shaped guide surfaces to enclose a continuous envelope space around the welding wire, achieving surface contact constraint on the welding wire. Compared to traditional point contact or line contact constraints, this structure can apply a continuous, uniform, and strong radial compressive force to the welding wire with initial bending, thereby forcibly eliminating residual stress inside the welding wire, effectively straightening the initially bent welding wire, and ensuring that the welding wire points towards the welding point with extremely high straightness.

[0042] It should be noted that the surface contact constraint of the multiple separate clamping plates 7 in this device on the welding wire, while forcibly straightening the welding wire, will not affect the normal movement of the welding wire. The multiple separate clamping plates 7 can be appropriately loosened at low-speed wire feeding to reduce wire feeding resistance and prevent welding wire stacking, while at high-speed wire feeding, they automatically tighten to provide sufficient damping and stiffness, thereby maintaining the stability and accuracy of the welding wire orientation throughout a wide speed range.

[0043] Reference Figures 1-2 The end of the wire feeding gun 3 away from the first flexible tube 4 is fixedly connected to the wire feeding tube 5, and the end of the wire feeding tube 5 is fixedly connected to the wire feeding gun head 6. The end of the split clamping plate 7 near the sensing mechanism is fixedly connected to the control block 9, and the end of the split clamping plate 7 away from the sensing mechanism is fixedly connected to the extension plate 8, and the extension plate 8 is located inside the wire feeding tube 5.

[0044] Specifically, the extension plate 8 extends into the wire feeding tube 5, effectively increasing the constraint length of the welding wire by the split clamp 7, so that the welding wire is always guided and supported before leaving the wire feeding gun head 6, thus minimizing the end vibration caused by excessive cantilever length.

[0045] Reference Figure 2 as well as Figure 9 The wire stabilizing mechanism also includes a guide rod 10 fixedly installed on the inner wall of the wire feeding gun 3, a guide groove 11 opened on the outer wall of the split clamping plate 7 for the guide rod 10 to slide, and a tension spring 12 sleeved on the wall of the guide rod 10. One end of the tension spring 12 is fixedly connected to the inner wall of the wire feeding gun 3, and the other end of the tension spring 12 is fixedly connected to the outer wall of the split clamping plate 7. The wire stabilizing mechanism also includes a drive ring 13 slidably installed inside the wire feeding gun 3 and a sliding groove 14 opened on the inner wall of the wire feeding gun 3 for guiding the drive ring 13. The inner wall of the drive ring 13 is inclined and abuts against the end of the control block 9 away from the split clamping plate 7.

[0046] Specifically, the sliding fit between the guide rod 10 and the guide groove 11 provides precise guidance for the radial movement of the split clamping plate 7, ensuring that the split clamping plate 7 will not deflect during movement. The synchronous compression of multiple control blocks 9 by the inner wall of the drive ring 13 ensures the smoothness and consistency of the synchronous contraction of multiple split clamping plates 7. Thus, by changing the axial displacement of the drive ring 13, the inner diameter of the split clamping plate 7 and the clamping force on the welding wire can be precisely adjusted, achieving precise control of the welding wire constraint strength according to the wire feeding speed.

[0047] When there is no external driving force, the tension spring 12 uses its own elastic tension to pull the split clamp 7 towards the inner wall of the wire feed gun 3, so that the split clamp 7 automatically stays open, thereby reducing the frictional resistance to the welding wire in low-speed wire feeding or non-working state, preventing the surface of soft aluminum welding wire from being scratched, and also reserving enough stroke space for subsequent clamping action.

[0048] Reference Figure 4 ,as well as Figure 10 The sensing mechanism includes a roller 15 rotatably installed inside the wire feed gun 3, and the roller 15 can be driven to rotate when the welding wire moves. The faster the welding wire moves, the greater the distance that the drive ring 13 moves toward the control block 9.

[0049] Specifically, in this embodiment, the rollers 15 are preferably configured as two, and the two rollers 15 are arranged symmetrically.

[0050] Reference Figures 5-6 ,as well as Figure 12The sensing mechanism also includes a mounting groove 16 formed on the inner wall of the wire feed gun 3, a base 17 slidably mounted inside the mounting groove 16, and a spring 34 fixedly mounted on the inner wall of the mounting groove 16. The axial end of the roller 15 is rotatably connected to the outer wall of the base 17, and the outer wall of the spring 34 abuts against the base 17.

[0051] Specifically, the sensing mechanism uses the direct contact between the roller 15 and the surface of the welding wire to monitor the wire feeding status in real time. Through the cooperation between the base 17 and the spring 34, the elastic force of the spring 34 pushes the base 17 towards the side of the welding wire, ensuring that the roller 15 can always be in close contact with the welding wire to avoid signal loss. This effectively compensates for the radial runout generated when the welding wire travels at high speed, ensuring the accuracy and stability of the measurement.

[0052] Reference Figures 5-7 ,as well as Figures 10-11 The sensing mechanism also includes a rotating shaft 19 fixedly mounted on the axial end of the roller 15, a fixed sleeve 20 fixedly mounted on the rod wall of the rotating shaft 19, a T-shaped rod 21 elastically mounted inside the fixed sleeve 20, a centrifugal roller 18 fixedly mounted on the end of the T-shaped rod 21 away from the fixed sleeve 20, a fixed ring 24 fixedly mounted on the outer wall of the base 17, and an airbag 23 fixedly mounted on the inner wall of the fixed ring 24. The airbag 23 is filled with hydraulic oil. The end of the rotating shaft 19 away from the roller 15 is rotatably connected to the outer wall of the base 17. When the roller 15 rotates, the centrifugal roller 18 can squeeze the hydraulic oil inside the airbag 23, causing the hydraulic oil to push the drive ring 13 to move. The sensing mechanism also includes a return spring 22 disposed inside the fixed sleeve 20. One end of the return spring 22 is fixedly connected to the rod wall of the rotating shaft 19, and the other end of the return spring 22 is fixedly connected to the end of the T-shaped rod 21 away from the centrifugal roller 18.

[0053] Specifically, when the welding wire moves, the frictional force drives the roller 15 and the rotating shaft 19 coaxially connected to it to rotate synchronously. The rotating shaft 19 then drives the fixed sleeve 20 to rotate. Under the action of centrifugal force, the centrifugal roller 18 undergoes radial displacement. When the wire feeding speed increases, the rotational speed of the roller 15 increases, the centrifugal force on the centrifugal roller 18 increases, and it overcomes the elastic resistance of the return spring 22 to be thrown outward. Conversely, it retracts. As the centrifugal roller 18 is thrown outward under high-speed rotation, its side wall strongly squeezes the air bladder 23, causing the internal volume of the air bladder 23 to be compressed. Since the hydraulic oil is incompressible, the pressure of the compressed hydraulic oil increases sharply and forms an axial thrust, which directly acts on the drive ring 13, forcing the drive ring 13 to slide axially towards the control block 9 in the slide groove 14. This achieves mechanical speed signal conversion, which not only has the advantages of smooth force transmission and rapid response, but also absorbs some impact vibration through the characteristics of hydraulic medium. This makes the displacement distance of the drive ring 13 strictly linearly proportional to the wire feeding speed of the welding wire, thereby precisely controlling the clamping force of the split clamping plate 7 on the welding wire, ensuring that the best wire stabilization and straightening effect can be obtained under different wire feeding speeds.

[0054] Reference Figures 2-3 ,as well as Figures 10-11 The sensing mechanism also includes a second flexible tube 25 fixedly installed on the outer wall of the base 17 and communicating with the inside of the airbag 23, a connecting groove 26 opened inside the wire feed gun 3 and communicating with the second flexible tube 25, a main channel 27 opened inside the wire feed gun 3 and communicating with the inside of the connecting groove 26, and a sliding cylinder 29 slidably installed inside the main channel 27, and the end of the sliding cylinder 29 is fixedly connected to the outer wall of the drive ring 13.

[0055] Specifically, refer to Figure 11 The end of the second hose 25 away from the airbag 23 is inserted into the inside of the connecting groove 26. As a flexible connecting medium, the second hose 25 effectively adapts to the displacement fluctuations of the base 17 as the roller 15 rotates, ensuring that the hydraulic oil can be reliably transmitted between the rotating parts and the stationary gun body.

[0056] Hydraulic oil flows into the main channel 27 via the connecting groove 26, directly converting the oil pressure into a thrust that drives the sliding cylinder 29 to move axially. Since the sliding cylinder 29 is fixedly connected to the drive ring 13, the physical quantity of centrifugal induction can be accurately converted into the displacement of the drive ring 13, thereby ensuring that the clamping action of the split clamping plate 7 on the welding wire and the wire feeding speed are highly synchronized.

[0057] Example 2, refer to Figures 2-3 ,as well as Figures 10-12This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the sensing mechanism further includes a bypass channel 30 that is opened inside the wire feed gun 3 and communicates with the inside of the main channel 27, a one-way valve 28 that is set inside the main channel 27, a piston 31 that is set inside the bypass channel 30, a connecting rod 32 that is fixedly installed on the outer wall of the piston 31, an adjustment groove 37 that is opened inside the wire feed gun 3 for the piston 31 to slide, and an adjustment block 33 that is fixedly installed on the end of the connecting rod 32.

[0058] Specifically, the adjusting groove 37 and the bypass channel 30 are internally connected. It should be noted that in the initial state, the top of the piston 31 is located in the adjusting groove 37. The adjusting groove 37 plays a limiting role for the piston 31. Therefore, the piston 31 can only slide along the axial direction of the adjusting groove 37 under the action of the connecting rod 32, so as to drive the piston 31 to partially or completely slide out of the bypass channel 30.

[0059] On the one hand, the operator can drive the connecting rod 32 by sliding the adjusting block 33 along the axis of the adjusting groove 37, thereby driving the piston 31 to partially or completely slide out of the bypass channel 30, thereby changing the size of the passage cross section in the bypass channel 30.

[0060] When piston 31 completely blocks bypass channel 30, a constant clamping force is applied to the welding wire throughout the welding process. After the wire feeding mechanism 36 starts feeding the wire, the sensing mechanism detects the wire feeding speed, and then the centrifugal roller 18 squeezes the hydraulic oil inside the air bladder 23. The oil can quickly pass through the one-way valve 28 and push the sliding cylinder 29 to move. The sliding cylinder 29 pushes the drive ring 13 to move, and the drive ring 13 adjusts the spacing of the multiple split clamping plates 7.

[0061] When piston 31 partially opens bypass channel 30, bypass channel 30 connects to main channel 27. As the wire feeding speed increases, the oil can move the drive ring 13 through check valve 28 and bypass channel 30 to adjust the spacing of multiple split clamping plates 7. When the wire feeding speed decreases, the multiple tension springs 12 cause the multiple split clamping plates 7 to move away from each other, thereby moving the drive ring 13 closer to roller 15. Simultaneously, the oil can return to the air bladder 23 through bypass channel 30. Because piston 31 partially blocks bypass channel 30, it prevents rapid oil backflow, maintains pressure, and buffers the flow, avoiding frequent reciprocating vibrations of the drive ring 13, making the wire feeding process more stable and controllable.

[0062] When piston 31 fully opens bypass channel 30, the cross-sectional area of ​​the bypass channel 30 reaches its maximum. When the wire feeding speed increases, the oil can quickly pass through check valve 28 and bypass channel 30, pushing drive ring 13 to move and adjust the spacing of multiple split clamps 7. When the wire feeding speed decreases, the oil can quickly return to the air bladder 23 through bypass channel 30.

[0063] On the one hand, the operator can slide the adjusting block 33 according to the actual situation to partially or fully open the bypass channel 30 of the piston 31. This allows for flexible adjustment of the clamping force on the welding wire during the welding process based on the wire feeding speed. Simultaneously, the speed of oil return can be controlled by sliding the adjusting block 33, making the wire feeding process more stable and controllable. On the other hand, by completely blocking the bypass channel 30 with the piston 31, a constant clamping force is applied based on the single wire feeding speed detected by the sensing mechanism during the welding process, further improving the ease of use of this device.

[0064] The remaining structure is the same as that in Example 1.

[0065] Working principle:

[0066] During operation, the wire feeding mechanism 36 first drives the welding wire through the first hose 4 into the wire feeding gun 3, and guides the welding wire to the axial position of the wire feeding gun 3 through the conical groove 35. During the wire's journey, the surface of the welding wire drives the roller 15 to rotate, and the faster the wire feeding speed, the higher the rotation speed of the roller 15. The rotating roller 15 drives the fixed sleeve 20 to rotate through the rotating shaft 19. Under the action of centrifugal force, the T-shaped rod 21 overcomes the resistance of the return spring 22 and is thrown outward, thereby pushing the centrifugal roller 18 to squeeze the air bag 23. After the hydraulic oil inside the air bag 23 is pressurized, it enters the main channel 27 through the second hose 25 and the connecting groove 26, and finally pushes the sliding cylinder 29 to form an axial displacement.

[0067] The movement of the sliding cylinder 29 causes the drive ring 13 to slide in the groove 14. The drive ring 13 uses its inclined inner wall to press against multiple control blocks 9, forcing multiple split clamping plates 7 to overcome the tension of the tension spring 12 and retract radially inward along the guide rod 10. After retraction, the split clamping plates 7 form an envelope-like surface contact constraint on the welding wire through the arc-shaped guide surface. The continuous and uniform radial extrusion force eliminates the original bending and residual stress of the welding wire. In conjunction with the extension plate 8 extending into the wire feeding tube 5, forced straightening and stable wire feeding are achieved.

[0068] By controlling the position of the piston 31 within the bypass channel 30 through the axial sliding adjustment block 33 along the adjustment groove 37, the characteristics of the hydraulic circuit can be flexibly adjusted: when the piston 31 partially opens the bypass channel 30, it can buffer and maintain oil pressure fluctuations, preventing frequent vibration of the drive ring 13 and making wire feeding smoother. When the piston 31 completely blocks the bypass channel 30, a constant clamping force can be used during welding based on the single wire feeding speed detected by the sensing mechanism, further improving the ease of use of this device, thereby achieving precise control of the wire constraint strength and adaptability to working conditions.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A laser welding device for producing aluminum profile doors and windows, comprising a welding torch (1), a laser emitting tube (2) fixedly installed at the nozzle of the welding torch (1), a wire feeding gun (3) rotatably installed on the body of the welding torch (1), a first flexible tube (4) fixedly installed at one end of the wire feeding gun (3), and a wire feeding mechanism (36) connected to the end of the first flexible tube (4) away from the wire feeding gun (3), characterized in that: The wire feed gun (3) has a tapered groove (35) for the welding wire to pass through at one end near the first hose (4). The wire feed gun (3) has a wire stabilizing mechanism inside. The wire stabilizing mechanism includes multiple split clamps (7) that can slide radially along the wire feed gun (3). The inner wall of the split clamps (7) has an arc-shaped guide surface for the welding wire to pass through. The wire feed gun (3) is also equipped with a sensing mechanism located in front of the split clamping plate (7). When the welding wire moves along the axial direction of the first hose (4) under the action of the thrust of the wire feed mechanism (36), the sensing mechanism senses the wire feeding speed of the wire feed mechanism (36) and transmits it to the wire stabilizing mechanism to drive multiple split clamping plates (7) to retract synchronously along the radial direction of the wire feed gun (3), thereby achieving continuous surface contact constraint on the welding wire and forcibly straightening the welding wire.

2. The laser welding equipment for producing aluminum profile doors and windows according to claim 1, characterized in that: The end of the wire feeding gun (3) away from the first flexible tube (4) is fixedly connected to the wire feeding tube (5), and the end of the wire feeding tube (5) is fixedly connected to the wire feeding gun head (6). The end of the split clamp (7) near the sensing mechanism is fixedly connected to the control block (9), and the end of the split clamp (7) away from the sensing mechanism is fixedly connected to the extension plate (8), and the extension plate (8) is located inside the wire feeding tube (5).

3. The laser welding equipment for producing aluminum profile doors and windows according to claim 2, characterized in that: The wire stabilizing mechanism also includes a guide rod (10) fixedly installed on the inner wall of the wire feeding gun (3), a guide groove (11) opened on the outer wall of the split clamp (7) for the guide rod (10) to slide, and a tension spring (12) sleeved on the wall of the guide rod (10). One end of the tension spring (12) is fixedly connected to the inner wall of the wire feeding gun (3), and the other end of the tension spring (12) is fixedly connected to the outer wall of the split clamp (7). The wire stabilizing mechanism also includes a drive ring (13) slidably installed inside the wire feeding gun (3) and a groove (14) opened on the inner wall of the wire feeding gun (3) for guiding the drive ring (13). The inner wall of the drive ring (13) is inclined and the inner wall of the drive ring (13) abuts against the end of the control block (9) away from the split clamp (7).

4. The laser welding equipment for producing aluminum profile doors and windows according to claim 3, characterized in that: The sensing mechanism includes a roller (15) rotatably mounted inside the wire feed gun (3), and the roller (15) can be driven to rotate when the welding wire moves. The faster the welding wire moves, the greater the distance the drive ring (13) moves toward the control block (9).

5. The laser welding equipment for producing aluminum profile doors and windows according to claim 4, characterized in that: The sensing mechanism also includes a mounting groove (16) opened on the inner wall of the wire feeder (3), a base (17) slidably installed inside the mounting groove (16), and a spring (34) fixedly installed on the inner wall of the mounting groove (16). The axial end of the roller (15) is rotatably connected to the outer wall of the base (17), and the outer wall of the spring (34) abuts against the base (17).

6. The laser welding equipment for producing aluminum profile doors and windows according to claim 5, characterized in that: The sensing mechanism also includes a rotating shaft (19) fixedly installed on the axial end of the roller (15), a fixed sleeve (20) fixedly installed on the rod wall of the rotating shaft (19), a T-shaped rod (21) elastically installed inside the fixed sleeve (20), a centrifugal roller (18) fixedly installed on the end of the T-shaped rod (21) away from the fixed sleeve (20), a fixed ring (24) fixedly installed on the outer wall of the base (17), and an airbag (23) fixedly installed on the inner wall of the fixed ring (24). The airbag (23) is filled with hydraulic oil. The end of the rotating shaft (19) away from the roller (15) is rotatably connected to the outer wall of the base (17). When the roller (15) rotates, the centrifugal roller (18) can squeeze the hydraulic oil inside the airbag (23), so that the hydraulic oil pushes the drive ring (13) to move.

7. The laser welding equipment for producing aluminum profile doors and windows according to claim 6, characterized in that: The sensing mechanism also includes a reset spring (22) disposed inside the fixed sleeve (20). One end of the reset spring (22) is fixedly connected to the rod wall of the rotating shaft (19), and the other end of the reset spring (22) is fixedly connected to the end of the T-shaped rod (21) away from the centrifugal roller (18).

8. The laser welding equipment for producing aluminum profile doors and windows according to claim 7, characterized in that: The sensing mechanism further includes a second hose (25) fixedly installed on the outer wall of the base (17) and communicating with the inside of the airbag (23), a connecting groove (26) opened inside the wire feed gun (3) and communicating with the second hose (25), a main channel (27) opened inside the wire feed gun (3) and communicating with the inside of the connecting groove (26), and a sliding cylinder (29) slidably installed inside the main channel (27), and the end of the sliding cylinder (29) is fixedly connected to the outer wall of the drive ring (13).

9. The laser welding equipment for producing aluminum profile doors and windows according to claim 8, characterized in that: The sensing mechanism also includes a bypass channel (30) that is opened inside the wire feed gun (3) and communicates with the inside of the main channel (27), a one-way valve (28) that is set inside the main channel (27), a piston (31) that is set inside the bypass channel (30), a connecting rod (32) that is fixedly installed on the outer wall of the piston (31), an adjustment groove (37) that is opened inside the wire feed gun (3) for the piston (31) to slide, and an adjustment block (33) that is fixedly installed on the end of the connecting rod (32).

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