Automobile sheet splicing device

Abstract

The application provides a kind of automobile plate welding device, relating to automobile processing technical field, the plate welding device includes symmetrical setting feeding conveying component, welding mechanism and centering assembly.Welding mechanism contains outer frame body, welding support table, gantry support frame and laser welding unit.Centering assembly realizes plate centering conveying by side push;Welding support table is equipped with liftable datum positioning batten on it, for plate end precise positioning;Gantry support frame adjusts height by height-adjusting cylinder, its bottom is equipped with multiple groups of piano key pressing units, generates induction signal to define the welding range of laser welding unit when pressing;Piano key unit is left with heat dissipation gap.The application can realize plate automatic centering, accurate positioning, reliable pressing and self-adaptive welding stroke control, effectively improve the welding quality, heat dissipation efficiency and production adaptability, suitable for efficient automatic welding operation of automobile plate.

Description

Technical Field

[0001] This invention relates to the field of automotive processing technology, and in particular to an automotive sheet metal welding device. Background Technology

[0002] In automobile manufacturing, body panels typically require welding to connect multiple metal sheets into a single structure, meeting the strength, weight, and shape requirements of different parts. Welding technology enables the effective connection of dissimilar materials and sheets of varying thicknesses, contributing to a body design that balances lightweighting and safety. Currently, common welding methods include laser welding and resistance spot welding, with laser welding gradually becoming the mainstream process due to its advantages such as a small heat-affected zone, controllable deformation, and high weld quality.

[0003] In existing technologies, welding equipment mostly adopts a fixed clamping and welding structure. Plate positioning usually relies on mechanical stops or vision recognition systems, which suffers from low positioning accuracy, poor adaptability, and cumbersome adjustments. During the welding process, the clamping device is mostly an integral or modular design with large gaps, resulting in poor heat dissipation and heat accumulation in the welding area, affecting weld formation and plate performance. In addition, the stroke of the welding head is usually fixed or needs to be manually adjusted in advance according to the plate width, which cannot flexibly adapt to different plate sizes, resulting in wasted idle stroke or insufficient weld coverage, affecting production efficiency and welding quality. Summary of the Invention

[0004] The purpose of this invention is to provide an automotive sheet metal welding device to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An automotive sheet metal welding device includes two feeding and conveying components for conveying sheet metal to be welded, and a welding mechanism disposed between the two feeding and conveying components. Each feeding and conveying component is equipped with a centering component, which is used to place the sheet metal to be welded at the centerline of the feeding and conveying component by side pushing. The welding mechanism includes an outer frame, a welding support platform structure, a gantry support assembly, and a laser welding unit. The outer frame consists of two symmetrically arranged components with the centerline of the feeding and conveying components as the center point. A height adjustment cylinder is disposed at the top of the outer frame. The two ends of the gantry support assembly are slidably connected to the two outer frame components, and the height adjustment cylinder is connected to the end of the gantry support assembly to adjust the height position of the gantry support assembly. The laser welding unit is disposed on the gantry. The support assembly can reciprocate along its length. The bottom of the gantry support assembly has a clearance along its length to allow the welding end of the laser welding unit to pass through. The bottom of the gantry support assembly is also provided with two sets of piano key clamping units linearly arrayed along both sides of the clearance. A heat dissipation gap is left between two adjacent piano key clamping units. When the piano key clamping unit presses on the plate to be welded, it can generate an induction signal and transmit it to the laser welding unit. The welding support platform structure is located between the two outer frames and is used to support the welding ends of the two plates to be welded. A reference positioning strip is provided on the welding support platform structure along its length. The reference positioning strip can protrude from the upper surface of the welding support platform structure or be placed under the welding support platform structure by vertical movement.

[0007] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In one alternative embodiment: the gantry support assembly includes two gantry support beams and a travel drive assembly. The two gantry support beams are arranged opposite each other and their ends are connected together by a fixed slider. The fixed slider is slidably engaged with the outer frame and connected to one end of the height adjustment cylinder. The corresponding sides of the two gantry support beams are inclined downward to form a V-shaped welding guide groove. The clearance is located at the bottom of the V-shaped welding guide groove. Two sets of piano key clamping units are respectively located at the bottom of the gantry support beams. The travel drive assembly is located on the gantry support beams and is connected to the laser welding unit.

[0009] In one alternative embodiment: the laser welding unit includes a welding mobile frame, a welding module body, and a welding head. The welding mobile frame is mounted on two gantry support beams at both ends. The welding module body is mounted on the welding mobile frame. The welding head is detachably mounted at the center of the welding mobile frame, with its end extending downwards to a clearance gap. A control module is also provided on the side of the welding mobile frame. The walking drive assembly includes a walking screw, a walking motor, and a guide rod. The walking screw and guide rod are respectively mounted on the two gantry support beams. The end of the walking screw is rotatably engaged with the gantry support beam via a bearing seat. One end of the walking motor is connected to one end of the walking screw. The walking screw spirally passes through one end of the welding mobile frame, and the guide rod slidably passes through one end of the welding mobile frame. The walking motor, the welding module body, and multiple key-pressing units are all electrically connected to the control module.

[0010] In one alternative embodiment: the piano key clamping unit includes a pressure rod, a piano key-type pressure block, and an upper top plate. The lower side of the gantry support beam has a clamping mounting plate. The pressure rod can movably pass through the clamping mounting plate. The piano key-type pressure block is located at the bottom of the pressure rod and is used to clamp the plate to be welded. The upper top plate is located at the top of the pressure rod and has a pressure sensing plate on its surface. A clamping spring is provided between the upper top plate and the clamping mounting plate, and both ends of the clamping spring are connected to the upper top plate and the clamping mounting plate, respectively.

[0011] In one alternative embodiment: the welding support platform structure includes a welding platform, a micro-motion conveying roller assembly, a reference positioning strip, and a release drive component. The welding platform is located between two outer frames, with both ends fixedly connected to the outer frames via brackets. There are two micro-motion conveying roller assemblies, each located on one side of the welding platform. The ends of the micro-motion conveying roller assemblies are rotatably connected to the brackets. The arc apex of the micro-motion conveying roller assembly, the upper surface of the welding platform, and the upper surface of the feeding conveying component are on the same horizontal plane. The outer frame is also provided with a release drive component, which is connected to the reference positioning strip and is also detachably connected to the ends of the two micro-motion conveying roller assemblies.

[0012] In one alternative embodiment: the micro-motion conveying roller assembly includes a micro-motion conveying shaft, a micro-motion conveying roller, and a micro-motion gear section. The end of the micro-motion conveying shaft is rotatably connected to a support. The micro-motion conveying roller is mounted on the micro-motion conveying shaft. The end of the micro-motion conveying shaft is provided with a micro-motion gear section. The ejection drive component includes an ejection cylinder and an ejection frame. The ejection cylinder is mounted on the outer frame, and its telescopic end is connected to the ejection frame. Both ends of the ejection frame extend to the side of the micro-motion conveying shaft and are provided with ejection racks that can mesh with the micro-motion gear section. A reference connecting rod connected to a reference positioning plate is provided at the middle position of the ejection frame. When the top edge of the reference positioning plate protrudes from the upper surface of the welding platform, the ejection rack disengages from the micro-motion gear section.

[0013] In one alternative embodiment: the two sides of the feeding conveying component have side guard plates along their length direction; the centering assembly includes a centering folding rod, a centering cylinder, and two lateral pushing units; the two lateral pushing units are rotatably mounted on the outer walls of the two side guard plates, with one end of each lateral pushing unit located inside the side guard plate; the centering folding rod is located below the feeding conveying component and slidably connected to the side guard plate; the centering cylinder is located at the bottom of the side guard plate, and its output end is connected to the centering folding rod; both ends of the centering folding rod are connected to the two lateral pushing units respectively.

[0014] In one alternative embodiment: the centering folding rod has a centering rack at its end; the lateral pushing unit includes a centering shaft and a centering support arm; the centering shaft is vertically rotatably mounted on the outer wall of the side guard plate; one end of the centering support arm is fixedly connected to the top of the centering shaft and extends from the upper side of the side guard plate to the upper side of the feeding conveyor component; the centering roller is rotatably mounted at the end of the centering support arm away from the centering shaft; a centering gear is provided at the bottom of the centering shaft; and the centering shaft meshes with the centering rack at the end of the centering folding rod.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects:

[0016] The automotive sheet metal welding device provided by this invention achieves automatic centering and precise positioning of the sheet metal to be welded during the conveying process by setting up a centering component in conjunction with a reference positioning strip, effectively avoiding welding end offset and significantly improving the butt joint accuracy and weld quality. The linear array arrangement of piano-key type clamping units ensures uniform clamping force distribution and provides heat dissipation gaps between units, facilitating timely heat dissipation, reducing thermal deformation, and improving weld cooling speed and microstructure. The piano-key clamping unit has a sensing function, automatically identifying the sheet width and generating signal boundaries to control the laser welding unit to adaptively adjust the welding stroke, avoiding ineffective movement and improving welding efficiency and equipment adaptability. The gantry support assembly achieves overall height adjustment via a height-adjusting cylinder, and works in conjunction with the piano-key clamping structure to achieve rapid pressing and releasing, offering flexible operation suitable for welding sheet metal of varying thicknesses. The overall structural layout is reasonable, with symmetrically arranged outer frame and welding support platform ensuring equipment rigidity and stability, making it suitable for continuous automated production scenarios and significantly improving the intelligence and integration level of automotive sheet metal welding. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the overall structure of the plate welding device in this invention.

[0019] Figure 2 This is a schematic diagram of the welding mechanism structure in one embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the gantry support assembly from one perspective in one embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the gantry support assembly from another perspective in one embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the key pressing unit structure in one embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of a welding support platform structure in one embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the disengagement drive component in one embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the centering component structure in one embodiment of the present invention.

[0026] Figure reference numerals: 100, feeding conveyor component; 110, side guard plate; 200, centering assembly; 210, centering folding rod; 220, centering rack; 230, centering cylinder; 240, centering shaft; 250, centering gear; 260, centering support arm; 270, centering roller; 300, welding mechanism; 400, outer frame; 410, height adjustment cylinder; 500, welding table; 600, micro-motion conveyor roller assembly; 610, micro-motion conveyor shaft; 620, micro-motion conveyor roller; 630, micro-motion gear; 700, gantry support assembly; 710, gantry support beam; clamping mounting plate. 711, Fixed slider 720, Piano key clamping unit 730, Pressure rod 731, Piano key type pressure block 732, Top plate 733, Clamping spring 734, Traveling screw 740, Traveling motor 750, Guide rod 760, Pressure sensing plate 770, Laser welding unit 800, Welding movable frame 810, Welding module body 820, Welding head 830, Control module 840, Reference positioning plate 900, Release drive component 910, Release cylinder 911, Release frame 912, Release rack 913, Reference connecting rod 914. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0028] The left, right, up, and down positions of the various components shown in the attached diagram are just one arrangement method; the specific positions should be set according to specific needs.

[0029] In one embodiment, such as Figures 1-3 As shown, an automotive sheet metal welding device includes two feeding and conveying components 100 for conveying sheet metal to be welded, and a welding mechanism 300 disposed between the two feeding and conveying components 100. Each feeding and conveying component 100 is provided with a centering component 200, which is used to place the sheet metal to be welded at the centerline of the feeding and conveying component 100 by pushing it from the side. The welding mechanism 300 includes an outer frame 400, a welding support platform structure, a gantry support assembly 700, and a laser welding unit 800. The outer frame 400 consists of two symmetrically arranged with the centerline of the feeding and conveying components 100 as the center point. A height adjustment cylinder 410 is provided on the top of the outer frame 400. The two ends of the gantry support assembly 700 are slidably connected to the two outer frame 400 respectively. The height adjustment cylinder 410 is connected to the end of the gantry support assembly 700 to adjust the height of the gantry support assembly 700. The laser welding unit 800 is mounted on the gantry support assembly 700 and can reciprocate along its length. A clearance is provided at the bottom of the gantry support assembly 700 along its length to allow the welding end of the laser welding unit 800 to pass through. Two sets of piano key clamping units 730, linearly arrayed along both sides of the clearance, are also provided at the bottom of the gantry support assembly 700. A heat dissipation gap is provided between adjacent piano key clamping units 730. When the piano key clamping unit 730 presses against the plate to be welded, it generates an induction signal and transmits it to the laser welding unit 800. The welding support platform structure is located between the two outer frames 400 and is used to support the welding ends of the two plates to be welded. A reference positioning strip 900 is provided on the welding support platform structure along its length. The reference positioning strip 900 can protrude from the upper surface of the welding support platform structure or be placed under the welding support platform structure through vertical movement.

[0030] In this embodiment of the invention, in the initial state, the reference positioning strip 900 protrudes from the upper surface of the welding support structure. The feeding conveyor component 100 adopts a conveyor belt structure as used in the prior art. The two plates to be welded are synchronously conveyed to the welding mechanism 300 by the two feeding conveyor components 100. The plates to be welded are laterally adjusted by the centering component 200 to maintain the centering state as they move forward on the feeding conveyor component 100. After the welding ends of the plates to be welded are on the upper surface of the welding support structure, they abut against one side of the reference positioning strip 900 until the welding ends of both plates abut against the side of the reference positioning strip 900. Then, the reference positioning strip 900 moves downward and no longer protrudes from the upper surface of the welding support structure. The welding ends of the two plates to be welded approach each other synchronously, which can effectively avoid deviation and ensure precision. Precise positioning improves welding quality. At this time, the height-adjusting cylinder 410 operates to drive the gantry support assembly 700 downward until multiple key clamping units 730 press against the upper surface of the plate to be welded, thus clamping the plate. Each key clamping unit 730 pressing against the plate generates a sensing signal, forming the movement range of the laser welding unit 800. When the laser welding unit 800 moves to the key clamping unit 730 that generates the sensing signal and is located at the outermost edge, the laser welding unit 800 moves back. This allows the stroke of the laser welding unit 800 to be automatically adjusted according to the width of the plate to be welded, ensuring sufficient welding while reducing ineffective stroke and improving efficiency. There are heat dissipation gaps between the multiple key clamping units 730 to ensure rapid heat dissipation and timely cooling during welding.

[0031] In one embodiment, such as Figures 1-4 As shown, the gantry support assembly 700 includes two gantry support beams 710 and a travel drive assembly. The two gantry support beams 710 are arranged opposite each other and connected at both ends by a fixed slider 720. The fixed slider 720 is slidably engaged with the outer frame 400 and connected to one end of the height adjustment cylinder 410. The corresponding sides of the two gantry support beams 710 are inclined downward to form a V-shaped welded guide groove. The clearance is located at the bottom of the V-shaped welded guide groove. Two sets of piano key clamping units 730 are respectively located at the bottom of the gantry support beams 710. The moving component is mounted on the gantry support beam 710 and connected to the laser welding unit 800. In this embodiment of the invention, the walking drive component drives the laser welding unit 800 to move along the length of the gantry support beam 710. The piano key pressing unit 730 pressing on the plate to be welded forms the moving range of the laser welding unit 800. Whenever the laser welding unit 800 moves to the piano key pressing unit 730 located at the outermost side and generates a sensing signal, the gantry support assembly 700 drives the laser welding unit 800 to move back to achieve reciprocating welding.

[0032] In one embodiment, such as Figures 1-4As shown, the laser welding unit 800 includes a welding movable frame 810, a welding module body 820, and a welding head 830. The welding movable frame 810 is mounted on two gantry support beams 710 at both ends. The welding module body 820 is mounted on the welding movable frame 810. The welding head 830 is detachably mounted at the center of the welding movable frame 810, and its end can extend downwards to the clearance gap. A control module 840 is also provided on the side of the welding movable frame 810. The walking drive assembly includes a walking screw 740, a walking motor 750, and a guide rod 760. The walking screw 740 and the guide rod 760 are respectively mounted on the two gantry support beams 710. The end of the walking screw 740 is rotatably engaged with the gantry support beam 710 through a bearing seat. One end of the walking motor 750 is connected to one end of the walking screw 740. The walking screw 740 spirally passes through one end of the welding movable frame 810. The guide rod 760 is slidable. The walking motor 750, the welding module body 820, and the multiple key clamping units 730 are all electrically connected to the control module 840. In this embodiment of the invention, when the key clamping unit 730 presses on the plate to be welded and generates a sensing signal, the key clamping unit 730 transmits the signal to the control module 840. The control module 840 can simulate the movement path of the laser welding unit 800 according to the position of the key clamping unit 730. The movement path corresponds to the width of the plate to be welded. The walking motor 750 drives the walking screw part 740 to rotate. Under the guidance and restriction of the guide rod 760 and the screw part 740 at the end of the welding frame 810, the entire laser welding unit 800 moves back and forth on the gantry support beam 710 according to the simulated movement path, ensuring the sufficiency of welding, avoiding ineffective walking and welding, and improving efficiency.

[0033] In one embodiment, such as Figures 2-5As shown, the piano key clamping unit 730 includes a pressure rod 731, a piano key-type pressure block 732, and an upper top plate 733. The gantry support beam 710 has a clamping mounting plate 711 on its lower side. The pressure rod 731 can movably pass through the clamping mounting plate 711. The piano key-type pressure block 732 is located at the bottom of the pressure rod 731 and is used to clamp the plate to be welded. The upper top plate 733 is located at the top of the pressure rod 731, and its surface has a pressure sensing plate 770. A clamping spring 734 is provided between the upper top plate 733 and the clamping mounting plate 711, with both ends of the clamping spring 734 connected to the upper top plate 733 and the clamping mounting plate 711 respectively. In this embodiment of the invention, the piano key-type pressure block... 732 uses a material with good thermal conductivity (such as copper) to achieve rapid heat dissipation; the piano key type pressure block 732 and the inclined part of the gantry support beam 710 have a certain gap. After the piano key type pressure block 732 presses on the plate to be welded, the entire piano key pressing unit 730 will move upward by one end until the upper top plate 733 abuts against the main body of the gantry support beam 710. The pressure sensing plate 770 is pressed and generates a sensing signal. Since the piano key pressing units 730 on both sides are not pressed on the plate to be welded, under the elastic force of the pressing spring 734, the pressing spring 734 does not contact the main body of the gantry support beam 710, and the pressure sensing plate 770 on the upper top plate 733 will not generate a sensing signal.

[0034] In one embodiment, such as Figure 1 , Figure 2 , Figure 6 and Figure 7As shown, the welding support platform structure includes a welding platform 500, a micro-motion conveyor roller assembly 600, a reference positioning strip 900, and a release drive component 910. The welding platform 500 is located between two outer frame bodies 400, and its two ends are fixedly connected to the outer frame bodies 400 via brackets. There are two micro-motion conveyor roller assemblies 600, which are respectively located on both sides of the welding platform 500. The ends of the micro-motion conveyor roller assemblies 600 are rotatably connected to the brackets. The arc apex of the micro-motion conveyor roller assembly 600 is on the upper surface of the welding platform 500. The upper surface of the feeding and conveying component 100 is on the same horizontal plane; the outer frame 400 is also provided with a release drive component 910, which is connected to the reference positioning strip 900, and the release drive component 910 is also detachably connected to the ends of the two micro-motion conveying roller assemblies 600; in the initial state of the present invention, the release drive component 910 is separated from the ends of the two micro-motion conveying roller assemblies 600, due to the arc apex and welding table of the micro-motion conveying roller assembly 600 The upper surface of the welding table 500 and the upper surface of the feeding conveyor 100 are on the same horizontal plane, which allows the front end of the plate to be welded to move smoothly onto the welding table 500 and contact the side of the reference positioning strip 900. The reference positioning strip 900 allows the two plates to be welded to be accurately positioned for welding even when they move asynchronously. After the front ends of the two plates to be welded are against the side of the reference positioning strip 900, the disengagement drive component 910 drives the reference positioning strip 900 to move downward. When the top of the reference positioning strip 900 is flush with the upper surface of the welding table 500, the disengagement drive component 910 is connected to the ends of the two micro-motion conveying roller assemblies 600. The disengagement drive component 910 drives the two micro-motion conveying roller assemblies 600 to rotate synchronously. Through the friction between the arc apex of the two micro-motion conveying roller assemblies 600 and the lower surface of the plate to be welded, the two plates to be welded can move synchronously toward the center of the welding table 500 to get closer to each other and avoid leaving a large gap due to the disengagement of the reference positioning strip 900.

[0035] In one embodiment, such as Figure 2 , Figure 6 and Figure 7As shown, the micro-motion conveying roller assembly 600 includes a micro-motion conveying shaft 610, a micro-motion conveying roller 620, and a micro-motion gear section 630. The end of the micro-motion conveying shaft 610 is rotatably connected to the bracket. The micro-motion conveying roller 620 is mounted on the micro-motion conveying shaft 610, and the end of the micro-motion conveying shaft 610 is provided with the micro-motion gear section 630. The release drive component 910 includes a release cylinder 911 and a release frame 912. The release cylinder 911 is mounted on the outer frame 400, and its telescopic end is connected to the release frame 912. The two ends of the release frame 912... Each part extends to the side of the micro-motion conveyor shaft 610 and is provided with a release rack 913 capable of meshing with the micro-motion gear part 630. A reference connecting rod 914 connected to the reference positioning plate 900 is provided at the middle position of the release frame 912. When the top edge of the reference positioning plate 900 protrudes from the upper end face of the welding table 500, the release rack 913 disengages from the micro-motion gear part 630. In this embodiment of the invention, the release cylinder 911 adjusts the height of the release frame 912 by its own extension and retraction. The reference positioning plate 900 follows the reference connecting rod 914 and the release frame 912. 2. Vertical movement to protrude from the upper surface of the welding table 500 or move downwards to the lower side of the welding table 500; when the welding ends of the two plates to be welded contact the side of the reference positioning strip 900, the release cylinder 911 is activated, driving the release frame 912 to move downwards. The reference positioning strip 900 follows the release frame 912 downwards via the reference connecting rod 914. When the top edge of the reference positioning strip 900 is flush with the upper surface of the welding table 500, the release rack 913 meshes with the micro-motion gear part 630, thereby causing the micro-motion conveying shaft 610 and the micro-motion conveying roller 620 to rotate. The micro-motion conveyor roller 620, through the friction between its arc apex and the lower surface of the plate to be welded, can push the plate to be welded towards the center line of the welding table 500, so that the two plates to be welded are close together, avoiding a large gap between the plates to be welded during welding; when the reference positioning strip 900 is completely under the welding table 500, the disengagement rack 913 disengages from the micro-motion gear part 630, and the micro-motion gear part 630 and the micro-motion conveyor shaft 610 can rotate freely, so that the welded plate can be transported to the next process through one of the feeding conveyor parts 100.

[0036] In one embodiment, such as Figure 1 and Figure 8As shown, the feeding and conveying component 100 has side guard plates 110 on both sides along its length. The centering assembly 200 includes a centering folding rod 210, a centering cylinder 230, and two lateral pushing units. The two lateral pushing units are rotatably mounted on the outer walls of the two side guard plates 110, with one end of each unit located inside the side guard plate 110. The centering folding rod 210 is located below the feeding and conveying component 100 and is slidably connected to the side guard plate 110. The centering cylinder 230 is located at the bottom of the side guard plate 110, and its output end is connected to the centering folding rod 210 for centering. The two ends of the folding rod 210 are respectively connected to two lateral pushing units. In this embodiment of the invention, the centering cylinder 230 drives the centering folding rod 210 to move along the width direction of the feeding conveyor 100 through its own extension and retraction. The two ends of the centering folding rod 210 act on the two lateral pushing units respectively. The lateral pushing units rotate and move to the center line of the feeding conveyor 100 at the end of the side guard plate 110. The two lateral pushing units clamp the plates to be welded from both sides to move them to the center line position of the feeding conveyor 100, ensuring that the two plates to be welded are in an aligned state.

[0037] In one embodiment, such as Figure 1 and Figure 8 As shown, the centering folding rod 210 has a centering rack 220 at its end. The lateral pushing unit includes a centering shaft 240 and a centering support arm 260. The centering shaft 240 is vertically rotatably mounted on the outer wall of the side guard plate 110. One end of the centering support arm 260 is fixedly connected to the top of the centering shaft 240 and extends from the upper side of the side guard plate 110 to the upper side of the feeding conveyor component 100. The centering roller 270 is rotatably mounted at the end of the centering support arm 260 away from the centering shaft 240. A centering gear 250 is provided at the bottom of the centering shaft 240. The centering shaft 240 and the centering... The centering rack 220 at the end of the folding rod 210 meshes with the centering rack 220; in this embodiment of the invention, when the centering folding rod 210 moves along the width direction of the feeding conveyor 100, the centering folding rod 210 causes the centering shaft 240 to rotate through the meshing of the centering rack 220 and the centering gear 250. The two centering shafts 240 rotate synchronously in opposite directions, and the centering support arm 260 rotates with the centering shaft 240. Then, the centering roller 270 gradually approaches the centerline of the feeding conveyor 100 and contacts the side of the plate to be welded, pushing it to the centerline position of the feeding conveyor 100.

[0038] The above embodiment provides an automotive sheet metal welding device, the working principle of which is as follows:

[0039] In the initial state, the reference positioning strip 900 protrudes from the upper surface of the welding table 500 under the drive of the disengagement drive component 910. The two plates to be welded are synchronously conveyed to the welding mechanism 300 by the two feeding conveyor components 100 respectively. During the conveying process, the centering component 200 works: the centering cylinder 230 drives the centering folding rod 210 to move, and the centering folding rod 210 drives the centering shaft 240 to rotate through the meshing of the centering rack 220 at its end with the centering gear 250, thereby causing the centering support arm 260 and the centering roller 270 at its end to swing towards the centerline, clamping and pushing the plates to be welded from both sides, so that they are accurately positioned at the centerline position of the feeding conveyor component 100.

[0040] The plates to be welded continue to move forward, their welding ends being conveyed to the upper surface of the welding table 500 and abutting against the side of the reference positioning strip 900. Once the welding ends of both plates are in contact with the reference positioning strip 900, the release drive component 910 is activated: the release cylinder 911 retracts, pulling the release frame 912 and the reference positioning strip 900 connected to it via the reference connecting rod 914 downwards. When the top of the reference positioning strip 900 is flush with the upper surface of the welding table 500, the release rack 913 on the release frame 912 meshes with the micro-gear 630 at the end of the micro-motion conveying roller assembly 600. The release frame 912 continues to move downwards, driving the micro-gear 630, the micro-motion conveying shaft 610, and the micro-motion conveying roller 620 to rotate via the release rack 913. The micro-motion conveyor roller 620 pushes the two plates to be welded to move synchronously towards the center of the welding table 500 through friction, so that their welding ends come close together and complete precise alignment. Then the reference positioning strip 900 descends completely below the welding table 500, disengaging from the rack 913 and the micro-motion gear part 630.

[0041] After the plate is positioned, the welding mechanism 300 begins operation. The lifting cylinder 410 actuates, pushing the fixed sliders 720 at both ends of the gantry support assembly 700 downwards along the outer frame 400, causing the entire gantry support assembly 700 to descend. The multiple sets of key-type clamping units 730 at the bottom of the gantry support beam 710 then press down, with the key-type pressure blocks 732 pressing against the upper surface of the plate to be welded. In the pressed key-type clamping units 730, the pressure rod 731 moves upwards, causing the upper top plate 733 to contact the gantry support beam 710 and compress the pressure spring 734, generating a sensing signal from the pressure sensor 770. Key-type clamping units 730 not pressed against the plate remain unchanged, generating no signal. All generated pressure sensing signals are transmitted to the control module 840.

[0042] The control module 840 automatically calculates and simulates the required movement path of the laser welding unit 800 based on the position of the key pressing units 730 that receive the pressure sensing signal. This path matches the actual width of the plate to be welded.

[0043] Subsequently, the laser welding unit 800 is activated. The travel motor 750 drives the travel screw 740 to rotate, and under the guidance of the guide rod 760, it moves the welding frame 810, the welding module body 820, and the welding head 830 along the gantry support beam 710. The laser beam emitted by the welding head 830 welds the joint of the plates through the clearance gap at the bottom of the gantry support beam 710. The control module 840 controls the laser welding unit 800 to reciprocate within its simulated path range. When the welding head 830 moves above the outermost key pressing unit 730 with a signal, it automatically turns back, thereby accurately matching the weld length, avoiding unnecessary travel, and improving welding efficiency.

[0044] During the welding process, the piano key type pressure block 732 is made of a high thermal conductivity material, and there is a gap between adjacent piano key pressing units 730, which is conducive to the rapid dissipation of welding heat and timely cooling.

[0045] After welding is completed, the cylinder component 410 is used to lift the gantry support assembly 700, and the key clamping unit 730 is released from clamping. One of the feeding conveyor components 100 can then be activated to deliver the welded finished sheet metal.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. An automotive sheet metal welding device, comprising two feeding and conveying components for conveying sheet metal to be welded respectively, and a welding mechanism disposed between the two feeding and conveying components, wherein each feeding and conveying component is provided with a centering component, the centering component being used to place the sheet metal to be welded at the centerline position of the feeding and conveying component by side pushing, characterized in that, The welding mechanism includes an outer frame, a welding support platform structure, a gantry support assembly, and a laser welding unit; The outer frame consists of two symmetrically arranged with the center line of the feeding conveyor as the center. The top of the outer frame is equipped with a height adjustment cylinder. The two ends of the gantry support assembly are slidably connected to the two outer frames respectively. The height adjustment cylinder is connected to the end of the gantry support assembly to adjust the height position of the gantry support assembly. The laser welding unit is mounted on the gantry support assembly and can reciprocate along its length. The bottom of the gantry support assembly has a clearance along its length to allow the welding end of the laser welding unit to pass through. The bottom of the gantry support assembly is also equipped with two sets of piano key clamping units arranged in a linear array along both sides of the clearance gap. A heat dissipation gap is left between two adjacent piano key clamping units. When the piano key clamping unit presses on the plate to be welded, it can generate a sensing signal and transmit it to the laser welding unit. The piano key clamping units pressing on the plate to be welded all generate sensing signals and form the movement range of the laser welding unit. The welding support platform structure is located between the two outer frames and is used to support the welding ends of the two plates to be welded. The welding support platform structure is provided with a reference positioning strip along its length. The reference positioning strip can be moved vertically to protrude from the upper surface of the welding support platform structure or placed on the lower side of the welding support platform structure. The gantry support assembly includes two gantry support beams and a travel drive assembly; Two gantry support beams are arranged opposite each other and connected at both ends by a fixed slider. The fixed slider is slidably engaged with the outer frame and connected to one end of the height adjustment cylinder. The corresponding sides of the two gantry support beams are inclined downward to form a V-shaped welding guide groove. The clearance is located at the bottom of the V-shaped welding guide groove. Two sets of piano key clamping units are respectively located at the bottom of the gantry support beams. The walking drive assembly is located on the gantry support beams and connected to the laser welding unit. The piano key pressing unit includes a pressing rod, a piano key-type pressing block, and an upper top plate; The lower side of the gantry support beam has a pressing and mounting plate, and the pressing rod can move through the pressing and mounting plate. The piano key type pressing block is located at the bottom of the pressing rod and is used to press the plate to be welded. The upper top plate is located on the top of the pressure rod and has a pressure sensing plate on its surface. A pressure spring is provided between the upper top plate and the pressure mounting plate, and the two ends of the pressure spring are respectively connected to the upper top plate and the pressure mounting plate.

2. The automotive sheet metal welding device according to claim 1, characterized in that, The laser welding unit includes a welding frame, a welding module body, and a welding head. The welding frame is installed on two gantry support beams at both ends, and the welding module body is located on the welding frame. The welding head is detachably mounted in the center of the welding frame, and its end can extend downward to the clearance gap. A control module is also provided on the side of the welding frame. The walking drive assembly includes a walking lead screw, a walking motor, and a guide rod; The traveling screw and guide rod are respectively installed on the two gantry support beams. The end of the traveling screw is rotatably connected to the gantry support beam through the bearing seat. One end of the traveling motor is connected to one end of the traveling screw. The traveling screw spirally passes through one end of the welding movable frame, and the guide rod can slide through one end of the welding movable frame. The walking motor, the main body of the welding module, and the multiple piano key clamping units are all electrically connected to the control module.

3. The automotive sheet metal welding device according to claim 1, characterized in that, The welding support structure includes a welding table, a micro-motion conveyor roller assembly, a reference positioning strip, and a release drive component; The welding table is located between two outer frames and its two ends are fixedly connected to the outer frames by brackets. There are two micro-motion conveying roller assemblies, which are respectively located on both sides of the welding table. The ends of the micro-motion conveying roller assemblies are rotatably connected to the brackets. The arc apex of the micro-motion conveying roller assembly, the upper surface of the welding table, and the upper surface of the feeding conveying component are on the same horizontal plane. The outer frame is also equipped with a release drive component, which is connected to the reference positioning strip and is also detachably connected to the ends of the two micro-motion conveying roller assemblies.

4. The automotive sheet metal welding device according to claim 3, characterized in that, The micro-motion conveyor roller assembly includes a micro-motion conveyor shaft, a micro-motion conveyor roller, and a micro-motion gear section; The end of the micro-motion conveying shaft is rotatably connected to the bracket, the micro-motion conveying roller is disposed on the micro-motion conveying shaft, the end of the micro-motion conveying shaft is provided with a micro-motion gear, and the release drive component includes a release cylinder and a release frame; The ejection cylinder is mounted on the outer frame, and its telescopic end is connected to the ejection frame. Both ends of the ejection frame extend to the side of the micro-motion conveyor shaft and are equipped with ejection racks that can mesh with the micro-motion gear. A reference connecting rod connected to the reference positioning plate is provided in the middle of the ejection frame. When the top edge of the reference positioning plate protrudes from the upper surface of the welding platform, the ejection rack disengages from the micro-motion gear.

5. The automotive sheet metal welding apparatus according to any one of claims 1-4, characterized in that, The feeding and conveying component has side guard plates on both sides along its length direction, and the centering assembly includes a centering folding rod, a centering cylinder and two lateral pushing units; Two lateral pushing units are rotatably mounted on the outer walls of the two side guard plates. One end of the lateral pushing unit is located inside the side guard plate. The centering folding rod is located below the feeding conveyor and is slidably connected to the side guard plate. The centering cylinder is located at the bottom of the side guard plate, and its output end is connected to the centering folding rod. Both ends of the centering folding rod are connected to the two lateral pushing units respectively.

6. The automotive sheet metal welding device according to claim 5, characterized in that, The centering folding rod has a centering rack at its end, and the lateral pushing unit includes a centering pivot and a centering support arm; The centering shaft is vertically rotatable on the outer wall of the side guard plate. One end of the centering support arm is fixedly connected to the top of the centering shaft and extends from the upper side of the side guard plate to the upper side of the feeding conveyor. The centering roller is rotatable at the end of the centering support arm away from the centering shaft. The centering shaft is equipped with a centering gear at its bottom, and the centering shaft meshes with the centering rack at the end of the centering folding rod.

Images