Stepping type laser welding device for heating wire of electric blanket

Abstract

The invention relates to the technical field of laser welding, and discloses an electric blanket heating wire stepping type laser welding device which comprises a welding platform, a plurality of laser welding heads are installed at the top of the welding platform, a welding auxiliary assembly is arranged outside each laser welding head, and each welding auxiliary assembly comprises a swing arm installed on the side wall of the corresponding laser welding head. The swing arm is obliquely arranged, a gear is installed at the bottom of the swing arm, the outer edge of the gear is subjected to fillet treatment, the welding auxiliary assembly further comprises rotating seats symmetrically and fixedly connected to the side wall of the laser welding head, the top of the swing arm is rotationally connected to the interior of the rotating seats, the gear is rotationally connected to the bottom of the swing arm, and a magnetic locking mechanism is formed by a rack, a first magnetic block and a second magnetic block. The tension state is locked after the gear rotates, accumulative errors caused by thermal stress in the welding process are effectively restrained, after multiple times of stepping welding, the welding spot interval errors are remarkably reduced compared with a traditional technology, and therefore the heating wire grid distribution precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and particularly to a step laser welding device for electric blanket heating wires. Background Art

[0002] The step laser welding device for electric blanket heating wires is an automated equipment dedicated to precisely welding the metal heating wires inside the electric blanket to the upper and lower fabric layers. This device adopts high-precision laser welding technology and sequentially completes the processing of multiple welding points through step-by-step movement to ensure the firm combination and uniform distribution of the heating wires and the fabric. Compared with ultrasonic welding in the prior art, laser welding has significant advantages: its non-contact processing will not cause mechanical damage to the insulation layer of the heating wires, and the extremely small heat-affected zone can avoid fabric burning or deformation.

[0003] However, there are still some problems with the existing step laser welding devices for electric blanket heating wires: First, when the laser welding fixes the heating wires by melting the fabric at high temperature, the instantaneous temperature in the welding area can reach 800 - 1200 °C, resulting in the melting and shrinkage of the polymer fabric. This shrinkage is conducted through the un-welded area, causing cumulative errors in the spacing between adjacent welding points and generating subtle abnormal tension in the heating wires. However, after 20 - 30 welding points accumulate, it may lead to the fracture of the solder joints.

[0004] More seriously, this stress accumulation has a positive feedback characteristic - the error of the previous solder joints will amplify the deviation of the subsequent solder joints through fabric displacement, ultimately resulting in uneven grid spacing of the heating wires. The actual measurement shows that the temperature difference can reach ±8 °C, which not only affects the use comfort but also may cause a fire risk due to local overheating.

[0005] Second, to meet the production efficiency requirements, the step cycle is usually compressed to 5 - 6 seconds, while the complete solidification of the electric blanket fabric usually requires 8 - 10 seconds. This rapid "welding - movement" cycle results in: the new solder joints bear mechanical vibration before they are completely crystallized, causing grain boundary defects in the microscopic structure of the solder joints;

[0006] At the same time, the molten area deforms under the action of inertial force during movement, further aggravating the spacing error. After continuous processing, the cumulative error cannot be underestimated and directly leads to the need for repair of some products.

[0007] Therefore, the present invention proposes a step laser welding device for electric blanket heating wires. Summary of the Invention

[0008] The purpose of the present invention is to provide a step laser welding device for electric blanket heating wires to solve the problems raised in the above background art.

[0009] To achieve the above object, the present invention provides the following technical solution: An electric blanket heating wire step laser welding device, comprising a welding platform, on the top of which a plurality of laser welding heads are installed, and a welding auxiliary component is arranged outside each laser welding head. The welding auxiliary component includes a swing arm installed on the side wall of the laser welding head. The swing arm is inclined, and a gear is installed at the bottom of the swing arm. The outer edge of the gear is rounded.

[0010] Preferably, the welding auxiliary component further includes a rotating seat symmetrically and fixedly connected to the side wall of the laser welding head. The top of the swing arm is rotatably connected to the inside of the rotating seat, and the gear is rotatably connected to the bottom of the swing arm.

[0011] Preferably, a torsion spring is fixedly connected between the gear and the inner wall of the rotating seat.

[0012] Preferably, a housing is fixedly connected to the inner wall of the swing arm, and a rack is slidably connected to the inside of the housing. The rack and the gear are meshed with each other.

[0013] Preferably, two magnetic blocks one are fixedly connected to both sides of the inner wall of the housing, and two magnetic blocks two are fixedly connected to both sides of the outer surface of the rack. The magnetic blocks one and the magnetic blocks two have opposite magnetic polarities.

[0014] Preferably, both magnetic blocks one inside the rack are close to the center line of the two gears, and both magnetic blocks one are away from the rack.

[0015] Preferably, a clamping block one is fixedly connected to the outer surface of the rotating seat, and a clamping block two is fixedly connected to the outer surface of the swing arm.

[0016] Preferably, a cooling auxiliary component is arranged on the outer surface of the swing arm. The cooling auxiliary component includes a rotating rod rotatably connected to the outer surface of the swing arm. A sliding inner rod is fixedly connected to the outer surface of one of the rotating rods, and a sliding outer rod is fixedly connected to the outer surface of the other rotating rod. The sliding inner rod is slidably connected to the inside of the sliding outer rod.

[0017] Preferably, a through hole one is opened at the bottom of the inner cavity of the sliding outer rod, and a one-way valve one is installed concentrically with the through hole one at the outer bottom of the sliding outer rod.

[0018] Preferably, a through hole two is opened at the top of the inner cavity of the sliding outer rod, and a one-way valve two is installed concentrically with the through hole two at the top of the inner cavity of the sliding outer rod.

[0019] Preferably, the opening direction of the one-way valve one faces the bottom of the sliding outer rod, and the opening direction of the one-way valve two faces the inside of the sliding outer rod.

[0020] Preferably, the outside of the welding platform is also provided with a clamp for fixing the electric blanket, and a spreading mechanism for covering the electric blanket with a second layer of cloth.

[0021] Preferably, the laser welding head realizes XY axis movement through a servo drive module, and the laser welding head is also integrated with a cylinder for driving the laser welding head to perform Z axis reciprocating motion.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Through the tilting and rotating design of the swing arm and the gear, the "front pulling and rear tensioning" action is triggered when the laser welding head is pressed down. The front gear is pre-tensioned clockwise and the rear gear is pre-tensioned counterclockwise. The friction force is used to form a bidirectional tension difference to offset the fabric melting shrinkage stress caused by the high temperature of welding in real time. The elastic deformation characteristics of the torsion spring adapt to the thickness fluctuation of the fabric. With the limiting effect of the clamping block 1 and the clamping block 2, it is ensured that the swing arm only rotates outward at a fixed angle, so that the pressing force of the gear on the fabric is stable and controllable, avoiding fabric damage or uneven tension caused by rigid contact. The magnetic locking mechanism of the rack and the magnetic block 1 and the magnetic block 2 locks the tension state after the gear rotates, effectively suppressing the cumulative error caused by thermal stress during welding. After multiple step welding, the error of the welding point spacing is significantly reduced compared with the traditional process, thereby improving the distribution accuracy of the heating wire grid.

[0024] 2. After welding, when the laser welding head rises, the gear is kept in an energy storage state by friction and magnetic attraction when it is not separated from the fabric. After it is completely separated from the fabric, the torsion spring releases the stored energy to drive the gear to rotate rapidly in the opposite direction. The rounded structure on the outer edge of the gear generates air disturbance when rotating at high speed, forming natural convection to assist the cooling of the welding point and shorten the solidification time of the molten zone of the fabric. This process does not require an additional power source. The torsion spring stores energy during the welding pressure stage and releases energy during the reset stage, converting the mechanical motion potential energy into cooling kinetic energy. Compared with traditional electric cooling solutions, it can reduce energy consumption. At the same time, it uses pure mechanical linkage to simplify the control system and improve the reliability and maintenance convenience of the equipment under complex working conditions.

[0025] 3. The cooling auxiliary component forms an "intake-compression-ejection" cycle during the swing arm rotation process through the reciprocating motion of the sliding inner rod and the sliding outer rod: when the swing arm rotates outward, the inner cavity volume of the sliding outer rod increases to generate negative pressure, and the outside air is sucked in through the one-way valve 2; when the swing arm is reset, the sliding inner rod squeezes the inner cavity, and the compressed air is ejected at high speed through the one-way valve 1, forming a directional airflow to act on the welding point;

[0026] This mechanism directly drives the generation of air flow by mechanical motion, without relying on external air sources or electronic control components. The response time is precisely synchronized with the welding cycle, and the air flow speed and cooling intensity are automatically adjusted with the movement of the swing arm, achieving seamless connection of "starting cooling immediately after welding completion", quickly reducing the solder joint temperature from the peak to the safe curing range, accelerating the crystallization of the fabric and reducing grain boundary defects, and improving the stability of the solder joint microstructure.

[0027] 4. Due to the attracting characteristics of the opposite magnetic poles of Magnet One and Magnet Two, mechanical locking is formed after the rack slides in place, keeping the rotation angle of the gear constant with the fabric tension, avoiding tension fluctuations caused by equipment vibration or thermal expansion during welding. This "gear drive + magnetic locking" composite structure not only transmits power through rigid meshing but also uses magnetism to achieve gapless locking, with a fast response speed and stable locking force. It can adapt to the tension requirements of different materials of fabrics, while reducing the wear risk of traditional mechanical buckles or bolt lockings, extending the service life of key components, and ensuring process consistency in long-term continuous production.

[0028] 5. Both the welding auxiliary component and the cooling auxiliary component realize their functions relying on the reciprocating motion of the laser welding head and the mechanical linkage of the swing arm, without the need for additional motors, sensors, or complex pipeline systems. The structure is compact and there are few maintenance nodes. The inclined design of the swing arm, the rotation of the gear, and the sliding stroke of the cooling component all match the stepping trajectory of the laser welding head, and can be seamlessly integrated into the existing automated production line to adapt to the welding requirements of different specifications of electric blankets. At the same time, the pure mechanical design has low requirements for the production environment and further helps to improve the automation level and production efficiency of electric blanket welding. Description of the Drawings

[0029] Figure 1 Front perspective three-dimensional schematic diagram of the main structure of the present invention;

[0030] Figure 2 Front perspective three-dimensional schematic diagram of the laser welding head of the present invention;

[0031] Figure 3 For the present invention Figure 2 Enlarged perspective three-dimensional schematic diagram of the structure at A in the present invention;

[0032] Figure 4 Cross-sectional perspective three-dimensional schematic diagram of the welding auxiliary component of the present invention;

[0033] Figure 5 For the present invention Figure 4 Enlarged perspective three-dimensional schematic diagram of the structure at B in the present invention;

[0034] Figure 6 Side perspective three-dimensional schematic diagram of the laser welding head of the present invention;

[0035] Figure 7 Stereo schematic diagram of Block One and Block Two of the present invention;

[0036] Figure 8 Schematic cross-sectional perspective view of the cooling auxiliary component of the present invention;

[0037] Figure 9 For the present invention Figure 8 Schematic enlarged perspective view of the structure at position C in the present invention;

[0038] Figure 10 For the present invention Figure 8 Schematic enlarged perspective view of the structure at position D in the present invention.

[0039] In the figure:

[0040] 11. Welding platform; 12. Laser welding head.

[0041] 2. Welding auxiliary component; 21. Rotating seat; 22. Swing arm; 23. Gear; 24. Torsion spring; 25. Housing; 26. Rack; 27. Magnet one; 28. Magnet two; 29. Block one; 210. Block two.

[0042] 3. Cooling auxiliary component; 31. Rotating rod; 32. Sliding inner rod; 33. Sliding outer rod; 34. Through hole one; 35. Check valve one; 36. Through hole two; 37. Check valve two. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] It should be noted that the laser welding head 12 only provides a welding function, the fixture provides a function of clamping the electric blanket, and the material laying mechanism only provides a function of laying the second layer of fabric. The working principles and specific structures of the above structures are all prior arts. Therefore, due to the generality of the above structures, the specific principles will not be described in detail hereinafter.

[0045] Example 1, please refer to as Figures 1 to 8 shown, a step laser welding device for the heating wire of an electric blanket, including a welding platform 11, a plurality of laser welding heads 12 are installed on the top of the welding platform 11, and a welding auxiliary component 2 is arranged outside each laser welding head 12. The welding auxiliary component 2 includes a swing arm 22 installed on the side wall of the laser welding head 12. The swing arm 22 is inclined, and a gear 23 is installed at the bottom of the swing arm 22. The outer edge of the gear 23 is rounded.

[0046] It should be noted that the welding auxiliary component 2 also includes a rotating seat 21 symmetrically fixedly connected to the side wall of the laser welding head 12, the top of the swing arm 22 is rotatably connected to the inside of the rotating seat 21, the gear 23 is rotatably connected to the bottom of the swing arm 22, and a torsion spring 24 is fixedly connected between the gear 23 and the inner wall of the rotating seat 21, a shell 25 is fixedly connected to the inner wall of the swing arm 22, a rack 26 is slidably connected inside the shell 25, the rack 26 and the gear 23 are meshed with each other, and a magnetic block 27 is fixedly connected to both sides of the inner wall of the shell 25, and a magnetic block 28 is fixedly connected to both sides of the outer surface of the rack 26, and the magnetic block 27 and the magnetic block 28 are fixedly connected. The magnetism of block 28 is opposite, the two magnetic blocks 1 27 inside the rack 26 are close to the center lines of the two gears 23, and the two magnetic blocks 1 27 are far away from the rack 26, the outer surface of the rotating seat 21 is fixedly connected with a clamp 1 29, the outer surface of the swing arm 22 is fixedly connected with a clamp 210, and the outside of the welding platform 11 is also provided with a clamp for fixing the electric blanket and a laying mechanism for covering the electric blanket with a second layer of cloth. The laser welding head 12 realizes XY axis movement through a servo drive module, and the laser welding head 12 is also integrated with a cylinder for driving the laser welding head 12 to perform Z axis reciprocating motion.

[0047] It should be noted that the welding process of the electric blanket heating wire is as follows: first, the first layer of fabric (base layer) is laid flat on the welding platform (11), and a metal heating wire (such as nickel-chromium alloy wire, constantan wire) is laid as a conductive heating element according to the designed path, and then the second layer of fabric (insulating layer or decorative layer) is covered by a laying mechanism, and the three-layer structure (first layer of fabric + heating wire + second layer of fabric) is precisely positioned and clamped by a clamp to ensure that the heating wire and the two layers of fabric are tightly fitted and not offset. The laser welding process is performed on the overlapping area of ​​the heating wire and the two layers of fabric. A high-energy laser beam is emitted by a laser welding head (12) and focused on the contact point between the heating wire and the fabric. The laser energy is used to locally melt the fabric and form a metallurgical bond with the surface of the heating wire, thereby achieving the fixation of the heating wire and the insulation packaging of the conductive path.

[0048] The specific welding position is the intersection or overlap area between the heating wire and the two layers of fabric. The heating wire is firmly fixed between the two layers of fabric through evenly spaced welding points, which not only ensures that the heating wire will not be pulled and displaced by external forces during use, but also avoids the risk of electric shock caused by direct exposure of the heating wire through the insulation properties of the fabric.

[0049] The non-contact processing characteristics of laser welding have significant advantages: first, it avoids the damage to the insulation layer of the heating wire (such as polyimide coating) caused by the mechanical pressure of traditional ultrasonic welding, ensuring stable insulation performance; second, the high energy density of the laser beam can achieve fast welding (single welding point processing time ≤ 1 second), and with the stepping moving mechanism, it can efficiently complete the continuous processing of the heating wire grid welding points, significantly improving production efficiency.

[0050] Specifically, when the electric blanket base layer (including heating wires) is laid flat as the first layer on the welding platform 11, the material laying mechanism immediately covers the second layer of fabric. The multi-dimensional clamping structure of the fixture forms a stable fixation on the two layers of fabric and the heating wires in the middle, ensuring that the three are closely fitted and there is no relative displacement.

[0051] Under the precise control of the servo drive module, the laser welding head 12 moves along the preset trajectory to directly above the first welding point, and the integrated cylinder drives it to vertically descend along the Z-axis, entering the welding preparation stage.

[0052] At this time, the welding auxiliary component 2 installed on the side wall of the laser welding head 12 synchronously operates: the gear 23 at the bottom of the swing arm 22 first contacts the fabric surface. The built-in torsion spring 24 generates elastic deformation due to the pressure on the swing arm 22, and provides a uniform initial pressing force for the fabric by virtue of the pre-tightening force.

[0053] It should be noted that this pre-tightening force adapts to the fabric thickness fluctuation through the flexible characteristics of the torsion spring 24. Even if there are local thickness differences between the base layer and the second layer of fabric, the swing arm 22 can still maintain the stable contact between the gear 23 and the fabric through the fine adjustment of the tilt angle.

[0054] It is worth noting that the rotation range of the swing arm 22 is limited by the first block 29 outside the rotating seat 21 and the second block 210 on the outer surface of the swing arm 22. This limiting structure ensures that the swing arm 22 can only rotate outward by a specific angle, avoiding the destructive pressure exerted on the fabric by the gear 23 due to excessive rotation.

[0055] As the laser welding head 12 continues to press down, the swing arm 22 gradually rotates outward, and the gear 23 and the fabric surface generate relative rolling, triggering the "pulling forward and stretching backward" tension control mechanism: the front gear 23 in the welding forward direction rotates clockwise, generating a forward frictional force on the fabric through the tooth profile with rounded corners on the surface, forming a pre-pulling action; the rear gear 23 rotates counterclockwise, pre-stretching the fabric backward with a symmetric frictional force. This two-way tension difference precisely offsets the melting and shrinking trend of the fabric caused by the high temperature during laser welding, avoiding the deviation of the adjacent solder joint spacing caused by the conduction of thermal stress.

[0056] At the same time, the rotation of the gear 23 drives the rack 26 to slide in the housing 25 through the meshing relationship, so that the second magnets 28 on both sides of the rack 26 move out of the repulsion area of the first magnet 27 far from the center line of the gear 23 and enter the attraction range of the first magnet 27 close to the center line.

[0057] When the rack 26 slides to the preset position, the magnetic adsorption effect between the opposite magnetic poles forms a mechanical lock, fixing the rotation angle of the gear 23, ensuring that the fabric tension remains constant during the welding process, and effectively suppressing the risk of solder joint displacement or fracture caused by the accumulation of thermal stress.

[0058] After the laser welding head 12 completes the energy output, the cylinder drives it to rise and reset along the Z-axis. In the initial rising stage, the gear 23 has not yet disengaged from the fabric. At this time, the frictional force of the fabric and the adsorption force between the magnetic blocks form a balance, keeping the torsion spring 24 in an energy storage state and preventing the swing arm 22 from resetting prematurely and interfering with the melting and solidification of the welding point.

[0059] When the laser welding head 12 rises to the point where the gear 23 completely disengages from the fabric surface, the frictional force disappears, and the torsion spring 24 releases the stored elastic potential energy, driving the gear 23 to rotate rapidly in the reverse direction. The rounded corner structure on the outer edge of the gear 23 disturbs the surrounding air during high-speed rotation, forming a local air flow that produces a natural air cooling effect on the just-welded area, accelerating the cooling and solidification of the fabric melting zone and reducing shrinkage deformation caused by the continuous action of high temperature.

[0060] Meanwhile, the swing arm 22 rotates in the reverse direction to the initial position under the action of gravity. The rack 26 is reset under the drive of the gear 23, and the second magnetic block 28 is re-adsorbed with the first magnetic block 27 away from the center line of the gear 23, preparing for the welding of the next cycle.

[0061] Throughout the process, the mechanical linkage mechanism and the laser welding rhythm are precisely coordinated: the elastic deformation of the torsion spring 24 realizes the adaptive adjustment to different fabric characteristics, the magnetic locking ensures the dynamic stability of the tension control, and the air flow disturbance generated by the reverse rotation of the gear 23 assists in cooling without additional energy consumption, forming a complete closed loop of "pre-tensioning - welding - cooling and resetting". This design not only improves the position accuracy and bonding strength of the welding points but also effectively solves the core problems of thermal shrinkage cumulative error and insufficient cooling efficiency in traditional processes through the ingenious cooperation of pure mechanical structures, providing an efficient and reliable technical solution for the automated welding of heating wire in electric blankets.

[0062] Embodiment 2, on the basis of Embodiment 1, please refer to as Figures 7 to 10 As shown, cooling auxiliary components 3 are arranged on the outer surfaces of the swing arms 22. The cooling auxiliary components 3 include rotating rods 31 rotatably connected to the outer surfaces of the swing arms 22. A sliding inner rod 32 is fixedly connected to the outer surface of one of the rotating rods 31, and a sliding outer rod 33 is fixedly connected to the outer surface of the other rotating rod 31. The sliding inner rod 32 is slidably connected to the inside of the sliding outer rod 33.

[0063] It should be noted that a through hole one 34 is opened at the bottom of the inner cavity of the sliding outer rod 33, and a one-way valve one 35 is concentrically installed on the outer bottom of the sliding outer rod 33 and communicated with the through hole one 34. A through hole two 36 is opened at the top of the inner cavity of the sliding outer rod 33, and a one-way valve two 37 is concentrically installed on the top of the inner cavity of the sliding outer rod 33 and communicated with the through hole two 36. The opening direction of the one-way valve one 35 faces the bottom of the sliding outer rod 33, and the opening direction of the one-way valve two 37 faces the inside of the sliding outer rod 33.

[0064] Specifically, on the basis of Example 1, the addition of the cooling auxiliary component 3 further improves the thermal management mechanism of the welding process. When the laser welding head 12 is pressed down along the Z axis, the rotating rod 31 installed on the outer surface of the swing arm 22 is linked with the outward rotation of the swing arm 22, driving the sliding inner rod 32 and the sliding outer rod 33 to move in opposite directions.

[0065] At this time, the inner cavity volume of the sliding outer rod 33 increases significantly due to the distance of the sliding inner rod 32, forming a local negative pressure environment, making the inner cavity pressure lower than the external atmospheric pressure. Under the action of the pressure difference, the outside air passes through the second through hole 36 at the top of the sliding outer rod 33, pushes the valve core of the second check valve 37 open, and is steadily sucked into the inner cavity of the sliding outer rod 33;

[0066] This air intake process completely relies on the mechanical kinetic energy of the swing arm 22 rotation, does not require an additional power source, and only realizes active air intake through geometric movement between structures, which reflects the high efficiency and energy saving of pure mechanical design.

[0067] When laser welding is completed and the laser welding head 12 begins to rise and reset, the swing arm 22 rotates inward and resets under the action of the torsion spring 24, driving the rotating rod 31 to move in the opposite direction, so that the sliding inner rod 32 moves deeper into the sliding outer rod 33. As the sliding inner rod 32 advances, the inner cavity volume of the sliding outer rod 33 gradually decreases, the inhaled air is compressed, and the air pressure increases significantly.

[0068] When the air pressure reaches a level sufficient to overcome the opening resistance of the one-way valve 35, the compressed air pushes open the valve core of the one-way valve 35 and is ejected at high speed from the through hole 34 at the bottom of the sliding outer rod 33, forming a directional airflow that acts precisely on the welding point area that has just been welded. This airflow has clear speed and direction characteristics, which can effectively take away the residual heat in the welding area and accelerate the solidification process of the fabric melting area.

[0069] The core advantage of this cooling mechanism lies in its deep coordination with the welding process: the generation of cooling airflow is completely synchronized with the movement cycle of the swing arm 22 - when the welding head is pressed down, air is inhaled to store energy, and when the welding head is raised, air is ejected for cooling, forming a "breathing" cyclic working mode.

[0070] This mechanical linkage does not need to rely on an electronic control system or an external air source. It converts the kinetic energy of the swing arm 22 into the kinetic energy of the airflow only through the reciprocating sliding of the sliding inner rod 32 and the sliding outer rod 33, thereby achieving a seamless connection between the cooling function and the welding action.

[0071] The directional airflow can quickly intervene at the peak temperature stage of the soldering point, accelerate heat conduction through forced convection, shorten the transition time of the fabric from molten state to solid state, and effectively reduce grain boundary defects and inertial deformation caused by incomplete solidification.

[0072] By integrating the cooling function into the mechanical movement of the swing arm 22, the device does not require additional complex components such as pipelines and fans, significantly simplifies the equipment structure, reduces the maintenance cost, and at the same time avoids the risk of air flow interfering with the laser beam or contaminating the fabric that may be brought about by traditional cooling methods.

[0073] In summary, through the ingenious innovation of the mechanical structure in the second embodiment, the kinetic energy during the welding process is converted into cooling power, achieving rapid cooling of the solder joints without consuming additional energy. This effectively improves the fabric curing speed and welding accuracy, providing an innovative and practical solution to the problems of thermal deformation and cumulative error in the welding of heating wires for electric blankets. This design concept of "movement-cooling" integration is not only applicable to the field of electric blanket production, but also provides a new technical path for the energy-saving and integrated development of automated welding equipment.

[0074] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0075] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A step-by-step laser welding device for heating wires of an electric blanket, comprising a welding platform (11), a plurality of laser welding heads (12) being mounted on the top of the welding platform (11), characterized in that: A welding auxiliary component (2) is arranged outside each of the laser welding heads (12), and the welding auxiliary component (2) comprises a swing arm (22) mounted on the side wall of the laser welding head (12), the swing arm (22) is arranged obliquely, a gear (23) is mounted at the bottom of the swing arm (22), and the outer edge of the gear (23) is rounded.

2. The step-by-step laser welding device for electric blanket heating wire according to claim 1 is characterized in that: The welding auxiliary component (2) also includes a rotating seat (21) symmetrically fixedly connected to the side wall of the laser welding head (12), the top of the swing arm (22) is rotatably connected to the inside of the rotating seat (21), and the gear (23) is rotatably connected to the bottom of the swing arm (22).

3. The step-by-step laser welding device for electric blanket heating wire according to claim 1 is characterized in that: A torsion spring (24) is fixedly connected between the gear (23) and the inner wall of the rotating seat (21).

4. The step-by-step laser welding device for electric blanket heating wire according to claim 1 is characterized in that: A housing (25) is fixedly connected to the inner wall of the swing arm (22), a rack (26) is slidably connected inside the housing (25), and the rack (26) and the gear (23) are meshed with each other.

5. The step-by-step laser welding device for electric blanket heating wire according to claim 4 is characterized in that: Magnetic blocks 1 (27) are fixedly connected to both sides of the inner wall of the shell (25), and magnetic blocks 2 (28) are fixedly connected to both sides of the outer surface of the rack (26), and the magnetic properties of magnetic blocks 1 (27) and 2 (28) are opposite.

6. The step-by-step laser welding device for heating wires of an electric blanket according to claim 5, characterized in that: The two magnetic blocks 1 (27) inside the rack (26) are both close to the center lines of the two gears (23), and the two magnetic blocks 1 (27) are both far away from the rack (26).

7. The step-by-step laser welding device for electric blanket heating wire according to claim 2 is characterized in that: The outer surface of the rotating seat (21) is fixedly connected with a first clamping block (29), and the outer surface of the swing arm (22) is fixedly connected with a second clamping block (210).

8. A step-by-step laser welding device for heating wires of an electric blanket according to any one of claims 1 to 7, characterized in that: The outer surface of the swing arm (22) is provided with a cooling auxiliary component (3), and the cooling auxiliary component (3) includes a rotating rod (31) rotatably connected to the outer surface of the swing arm (22), wherein the outer surface of one of the rotating rods (31) is fixedly connected to a sliding inner rod (32), and the outer surface of the other rotating rod (31) is fixedly connected to a sliding outer rod (33), and the sliding inner rod (32) is slidably connected to the inside of the sliding outer rod (33).

9. The step-by-step laser welding device for heating wires of an electric blanket according to claim 8, characterized in that: A through hole (34) is provided at the bottom of the inner cavity of the sliding outer rod (33), and a one-way valve (35) is installed at the outer bottom of the sliding outer rod (33) and concentrically with the through hole (34).

10. The step-by-step laser welding device for electric blanket heating wires according to claim 8, characterized in that: A second through hole (36) is provided at the top of the inner cavity of the sliding outer rod (33), and a second one-way valve (37) is installed at the top of the inner cavity of the sliding outer rod (33) and concentrically with the second through hole (36).

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