A welding device for automobile seat production

Abstract

This invention provides a welding apparatus for automobile seat production, comprising: a worktable; a backrest frame including a backrest workpiece and a main outer contour tube; a backrest clamping part, mounted on the upper surface of the worktable, for clamping and fixing the backrest workpiece of the automobile seat backrest frame; a bent tube clamping part, mounted on the upper surface of the worktable, for clamping and fixing the main outer contour tube of the automobile seat backrest frame; and a welding tool, mounted on the upper surface of the worktable, for welding the gap between the backrest workpiece and the main outer contour tube; the upper end of the backrest workpiece is provided with an arc-shaped joint, and the radial dimension of the arc-shaped joint matches the diameter of the main outer contour tube. This invention improves the positioning accuracy and welding stability of the backrest workpiece and the main outer contour tube by positioning and fixing the arc-shaped joint of the backrest workpiece and the main outer contour tube. Simultaneously, only welding the gap between the arc-shaped joint and the main outer contour tube is required to ensure a strong connection, reducing welding costs.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat manufacturing technology, and particularly relates to a welding device for automotive seat manufacturing. Background Technology

[0002] In the process of automobile manufacturing, the seat is undoubtedly one of the most important internal components, and the core component of the car seat is the seat frame assembly.

[0003] The seat frame is one of the core components of a car seat. Its basic structure is mainly a metal frame or a tubular frame. Metal frame assemblies are mainly produced by stamping and then assembled. Tubular frame assemblies are mostly bent, stamped (flattened), drilled, and then assembled by robotic or manual welding.

[0004] In existing technologies, the backrest assembly and the outer contour main pipe of the backrest are mostly welded together directly. However, this welding method has at least the following drawbacks:

[0005] First, precise positioning of the backrest workpiece and the outer contour main pipe of the backrest is required, which undoubtedly increases the cost of the backrest clamping part and the bent pipe clamping part. Second, stability of the backrest workpiece and the outer contour main pipe of the backrest is required during the welding process, which also increases the cost of the backrest clamping part and the bent pipe clamping part. Finally, the contact area between the outer contour main pipe of the backrest and the backrest workpiece needs to be welded around the entire circle, which increases the welding cost.

[0006] Therefore, how to provide a welding device for automotive seat production that can improve the positioning accuracy and welding stability during seat frame welding has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] This invention provides a welding apparatus for automobile seat production, comprising:

[0008] Workbench;

[0009] Backrest frame, including backrest components and backrest outer contour main body;

[0010] The backrest clamping part is installed on the upper surface of the workbench and is used to clamp and fix the backrest workpiece of the car seat backrest frame.

[0011] The bent tube clamping part is installed on the upper surface of the workbench and is used to clamp and fix the outer contour tube of the car seat back frame.

[0012] Welding equipment, mounted on the upper surface of the workbench, is used to weld the gap between the backrest workpiece and the outer contour main tube of the backrest.

[0013] The upper end of the backrest workpiece is provided with an arc-shaped joint, and the radial dimension of the arc-shaped joint matches the diameter of the outer contour main tube of the backrest.

[0014] Furthermore, the backrest clamping part includes a positioning element and a clamping mechanism;

[0015] The positioning components include:

[0016] A horizontal tube receiving seat is fixedly installed on the workbench and is provided with a U-shaped groove, in which the horizontal tube of the workpiece overlaps.

[0017] The reinforcing plate receiving seat is fixedly installed on the workbench and is provided with a U-shaped groove, in which the workpiece reinforcing plate overlaps.

[0018] The hanging part is fixedly installed on the workbench and is equipped with a hanging column, on which the hanging bracket is hung;

[0019] The clamping mechanism is fixedly installed on the workbench and is configured as a pair, each clamping and fixing a pair of profile side plates.

[0020] Furthermore, the clamping mechanism includes a support fixedly mounted on the worktable, and the support is located inside the back of the workpiece;

[0021] An upper telescopic rod and a lower telescopic rod are installed on the outer side wall of the support. An inner clamp is installed on the moving end of the upper telescopic rod, and an outer clamp is installed on the moving end of the lower telescopic rod.

[0022] The inner clamp is located inside the backrest workpiece, and the outer clamp is located outside the backrest workpiece.

[0023] When the upper and lower telescopic rods extend together, the inner and outer clamps move closer to each other; when the upper and lower telescopic rods retract together, the inner and outer clamps move further apart.

[0024] Furthermore, the inner clamp is fixedly installed at the end of the upper telescopic rod's moving end;

[0025] The outer clamp is L-shaped, with a clamping part formed on the inner side wall of the upper end of its vertical section, and the end of its horizontal section is hinged to the end of the lower telescopic rod's moving end.

[0026] The clamping mechanism also includes a hinge seat and a connecting rod. The hinge seat is fixedly installed on the outer side wall of the support. One end of the connecting rod is hinged to the hinge seat, and the other end of the connecting rod is hinged to the vertical section.

[0027] Furthermore, the pipe clamping part includes:

[0028] The lifting platform is fixedly installed on the workbench.

[0029] The lifting boom is installed in the lifting base in a height-adjustable manner.

[0030] U-shaped clamps are fixedly installed on the upper end of the lifting rod;

[0031] The U-shaped clip has its opening facing upwards, and the opening size matches the outer diameter of the main tube of the backrest.

[0032] Furthermore, a lifting rod is provided on the inner side of the lifting rod, and the lifting rod is in contact with the lifting rod;

[0033] The lower end of the lifting rod is connected to the telescopic power source.

[0034] Moreover, in the first state, the lifting rod and the lowering rod are relatively fixed; in the second state, the lifting rod and the lowering rod slide relative to each other.

[0035] Furthermore, the feature is that the interior of the lifting seat has an installation cavity that runs vertically through it, and the lifting rod is a stepped rectangular column with the lower end being the large end and the upper end being the small end.

[0036] The large end is slidably installed inside the mounting cavity, and the small end protrudes through the upper opening of the mounting cavity;

[0037] A sliding hole is provided in the center of the lifting rod, and the lifting rod is slidably installed in the sliding hole. The lower end of the lifting rod extends out of the sliding hole and passes through the lower opening of the mounting cavity.

[0038] The outer wall of the lifting rod has several mounting holes, and the mounting holes are arranged in a vertical array.

[0039] The mounting hole is equipped with a sliding component that can slide relative to the mounting hole. The inner side wall of the lifting rod is provided with several ball grooves, and the ball grooves are arranged in a vertical array. The number of ball grooves is greater than the number of mounting holes.

[0040] Among them, the end of the slider away from the ball groove is a columnar part, and the shape and size of the columnar part match the mounting hole;

[0041] The end of the slider near the ball groove is a spherical part, and the shape and size of the spherical part match the ball groove.

[0042] An elastic element is also provided inside the mounting hole. One end of the elastic element is fixedly connected to the mounting hole, and the other end is fixedly connected to the sliding component.

[0043] Furthermore, the welding equipment includes a first welding tool and a second welding tool, both of which are mounted on the workbench and located on both sides of the outer contour main tube of the backrest.

[0044] Furthermore, the first welding needle of the first welding tool and the second welding needle of the second welding tool are arranged alternately in the vertical direction;

[0045] During welding, the vertical component of the force exerted by the first welding tool on the backrest frame is equal to the vertical component of the force exerted by the second welding tool on the backrest frame.

[0046] Furthermore, in the initial state, the first welding tool is located on the upper side of the outer contour main tube of the backrest, and the second welding tool is located on the lower side of the outer contour main tube of the backrest.

[0047] The first welding fixture also includes a first turntable, and the main body of the first welding fixture is fixedly installed on the first turntable;

[0048] The second welding fixture also includes a second turntable, and the main body of the second welding fixture is fixedly mounted on the second turntable;

[0049] The installation positions of the first welding tool on the first turntable and the installation positions of the second welding tool on the second turntable are staggered vertically.

[0050] The beneficial effects of this invention are:

[0051] (1) By positioning and fixing the arc-shaped joint of the backrest workpiece and the outer contour main pipe of the backrest, the positioning accuracy and welding stability of the two are improved, thereby reducing the cost of the backrest clamping part and the bent pipe clamping part. At the same time, since the backrest workpiece and the outer contour main pipe of the backrest are fixed by interference fit, only the gap between the arc-shaped joint and the outer contour main pipe of the backrest needs to be welded to ensure the firmness of the connection between the two, thus reducing the welding cost.

[0052] (2) For backrest frames with irregular shapes on both sides of the profile side panel, the clamping mechanism of the present invention allows both the inner and outer clamps to move, moving them away from and closer to each other, which facilitates the placement and clamping of the profile side panel. Furthermore, the structure is simple and the operation is convenient.

[0053] (3) The present invention can fix the outer contour main tube of the backrest by simply abutting the bent tube clamping part below the backrest outer contour main tube and cooperating with the arc-shaped connector. The bent tube clamping part has a simple structure and the clamping and fixing process is convenient and time-saving.

[0054] (4) When the force exerted by the U-shaped clamp against the outer contour of the backrest exceeds the threshold, the U-shaped clamp automatically stops pushing against the outer contour of the backrest, thus preventing excessive force from affecting the positional accuracy of the workpiece and the outer contour of the backrest. Furthermore, without relying on sensors and control systems, it eliminates the possibility of the U-shaped clamp exerting excessive force against the outer contour of the backrest due to signal transmission lag.

[0055] (5) The force applied by the first welding tool to the backrest frame and the force applied by the second welding tool to the backrest frame cancel each other out in the vertical direction, so that the outer contour main pipe of the backrest is not subjected to any force in the vertical direction as a whole. Therefore, the outer contour main pipe of the backrest is not easy to shift, thus avoiding affecting the positional accuracy of the backrest workpiece and the outer contour main pipe of the backrest. At the same time, the welding device of the present invention can realize double-sided welding of the outer contour main pipe of the backrest, improving the welding efficiency. Attached Figure Description

[0056] Figure 1 This is an overall drawing of the welding equipment;

[0057] Figure 2 This is an overall diagram of the backrest frame;

[0058] Figure 3 The overall drawing of the welding device is to conceal the welding equipment;

[0059] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0060] Figure 5 This is a structural diagram of the clamping mechanism;

[0061] Figure 6 This is a cross-sectional view of the pipe clamping part;

[0062] Figure 7 for Figure 6 Enlarged view of a section at point B in the middle;

[0063] Figure 8 This is a structural diagram of the welding device;

[0064] Figure 9 This is a structural diagram of welding equipment.

[0065] Workbench 100, backrest clamping part 200, positioning part 210, horizontal tube receiving seat 211, reinforcing plate receiving seat 212, hanging part positioning part 213, clamping mechanism 220, support 221, upper telescopic rod 222, lower telescopic rod 223, inner clamp 224, outer clamp 225, vertical section 226, horizontal section 227, hinge seat 228, connecting rod 229, bent tube clamping part 300, lifting seat 310, mounting cavity 311, lifting rod 320, large end 321, small end 322, sliding hole 32 3. Ball groove 324, U-shaped clamp 330, lifting rod 340, mounting hole 341, sliding part 342, elastic element 343, welding tool 400, first welding tool 410, first welding needle 411, first turntable 412, second welding tool 420, second welding needle 421, second turntable 422, backrest frame 500, backrest workpiece 510, arc joint 511, backrest outer contour main tube 520, angle adjuster mounting part 530, workpiece horizontal tube 540, workpiece reinforcing plate 550, hanger part 560. Detailed Implementation

[0066] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] like Figures 1-9 As shown, this embodiment provides a welding apparatus for automobile seat production, including a workbench 100 and a backrest clamping part 200, a bent pipe clamping part 300, and a welding tool 400 mounted on the upper surface of the workbench 100.

[0068] The backrest clamping part 200 is used to clamp and fix the backrest workpiece 510 of the car seat backrest frame 500, the bent tube clamping part 300 is used to clamp and fix the backrest outer contour main tube 520 of the car seat backrest frame 500, and the welding tool 400 is used to weld the gap between the backrest workpiece 510 and the backrest outer contour main tube 520.

[0069] It is understood that the welding device in this embodiment is used to weld and fix the backrest workpiece 510 and the backrest outer contour main tube 520 of the automobile seat backrest frame 500. The backrest workpiece 510 is a pair of profile side plates, and the lower end of the profile side plate is provided with an adjuster mounting part 530; the backrest outer contour main tube 520 is a generally U-shaped bent tube, and the two ends of the U-shaped bent tube are respectively welded to the upper ends of the pair of profile side plates.

[0070] In the existing technology, the backrest workpiece 510 and the backrest outer contour main tube 520 are usually welded together directly.

[0071] However, this welding method has at least the following drawbacks: First, it requires precise positioning of the backrest workpiece 510 and the backrest outer contour main tube 520, which undoubtedly increases the cost of the backrest clamping part 200 and the bent tube clamping part 300; second, it requires the backrest workpiece 510 and the backrest outer contour main tube 520 to remain stable during the welding process, which also increases the cost of the backrest clamping part 200 and the bent tube clamping part 300; finally, it requires welding the entire circumference of the contact area between the backrest outer contour main tube 520 and the backrest workpiece 510, which increases the welding cost.

[0072] Therefore, in this embodiment, an arc-shaped connector 511 is provided at the upper end of the backrest workpiece 510, and the radial dimension of the arc-shaped connector 511 matches the diameter of the backrest outer contour main tube 520, so that the two ends of the backrest outer contour main tube 520 are respectively inserted into the arc-shaped connector 511, thereby completing the positioning and fixing of the backrest workpiece 510 and the backrest outer contour main tube 520.

[0073] Therefore, by positioning and fixing the backrest workpiece 510 and the outer contour main tube 520 of the backrest, the positioning accuracy and welding stability of the two are improved, thereby reducing the cost of the backrest clamping part 200 and the bent tube clamping part 300. At the same time, since the backrest workpiece 510 and the outer contour main tube 520 of the backrest are fixed by interference fit, only the gap between the arc-shaped joint 511 and the outer contour main tube 520 of the backrest needs to be welded to ensure the firmness of the connection between the two, thus reducing the welding cost.

[0074] In this embodiment, the backrest clamping part 200 includes a positioning member 210 and a clamping mechanism 220. The positioning member 210 is used to position the backrest workpiece 510 at an accurate position on the worktable 100 so that the clamping mechanism 220 clamps and fixes the backrest workpiece 510 in a precise position. The clamping mechanism 220 is used to stably fix the backrest workpiece 510 on the worktable 100.

[0075] Specifically, the positioning component 210 includes a horizontal tube receiving seat 211, a reinforcing plate receiving seat 212, and a hanging part positioning part 213. The horizontal tube receiving seat 211 is fixedly installed on the worktable 100 and is provided with a U-shaped groove, in which the workpiece horizontal tube 540 overlaps. The reinforcing plate receiving seat 212 is fixedly installed on the worktable 100 and is provided with a U-shaped groove, in which the workpiece reinforcing plate 550 overlaps. The hanging part positioning part 213 is fixedly installed on the worktable 100 and is provided with a hanging column, on which the hanging bracket 560 is hung.

[0076] Thus, the horizontal tube receiving seat 211 and the reinforcing plate receiving seat 212 work together to fix the vertical position of the backrest workpiece 510, and the hanging positioning part 213 fixes the front and rear position of the backrest workpiece 510, thereby placing the backrest workpiece 510 in an accurate position on the worktable 100.

[0077] The clamping mechanism 220 is fixedly installed on the worktable 100, and is configured as a pair, each clamping and fixing a pair of profile side plates. The clamping mechanism 220 includes a support 221 fixedly installed on the worktable 100, and the support 221 is located inside the backrest workpiece 510; an upper telescopic rod 222 and a lower telescopic rod 223 are installed on the outer side wall of the support 221, an inner clamp 224 is installed at the moving end of the upper telescopic rod 222, and an outer clamp 225 is installed at the moving end of the lower telescopic rod 223.

[0078] The inner clamp 224 is located inside the backrest workpiece 510, and the outer clamp 225 is located outside the backrest workpiece 510. Furthermore, when the upper telescopic rod 222 and the lower telescopic rod 223 extend together, the inner clamp 224 and the outer clamp 225 move closer to each other; when the upper telescopic rod 222 and the lower telescopic rod 223 retract together, the inner clamp 224 and the outer clamp 225 move further apart.

[0079] Therefore, before welding, firstly, the upper telescopic rod 222 and the lower telescopic rod 223 are shortened together, so that the inner clamp 224 and the outer clamp 225 are far apart; then, the profile side plate is placed between the inner clamp 224 and the outer clamp 225; finally, the upper telescopic rod 222 and the lower telescopic rod 223 are extended together, so that the inner clamp 224 and the outer clamp 225 are close together to clamp the profile side plate.

[0080] For the backrest frame 500 with irregular shapes on both sides of the profile side panel, the clamping mechanism 220 of this embodiment, the inner clamp 224 and the outer clamp 225 can both move, so that the two move away from each other and move closer to each other, which facilitates the placement and clamping of the profile side panel.

[0081] Specifically, the inner clamp 224 is fixedly installed at the end of the upper telescopic rod 222's moving end. The outer clamp 225 is L-shaped, with a clamping portion formed on the inner side wall of the upper end of its vertical section 226, and the end of its horizontal section 227 is hinged to the end of the lower telescopic rod 223's moving end. The clamping mechanism 220 also includes a hinge seat 228 and a connecting rod 229. The hinge seat 228 is fixedly installed on the outer side wall of the support 221, one end of the connecting rod 229 is hinged to the hinge seat 228, and the other end of the connecting rod 229 is hinged to the vertical section 226.

[0082] Thus, when the upper telescopic rod 222 and the lower telescopic rod 223 extend together, the inner clamp 224 and the outer clamp 225 move closer to each other; when the upper telescopic rod 222 and the lower telescopic rod 223 shorten together, the inner clamp 224 and the outer clamp 225 move further apart.

[0083] With the above settings, the clamping mechanism 220 of this embodiment allows both the inner clamp 224 and the outer clamp 225 to move, facilitating the placement and clamping of the profile side plate. Furthermore, it has a simple structure and is easy to operate.

[0084] In this embodiment, the pipe bending clamp 300 includes a lifting seat 310 fixedly mounted on the workbench 100, a lifting rod 320 movably mounted within the lifting seat 310, and a U-shaped clamp 330 fixedly mounted on the upper end of the lifting rod 320. The opening of the U-shaped clamp 330 faces upward, and the opening size matches the outer diameter of the outer contour main pipe 520 of the backrest.

[0085] Before welding, the welding apparatus for automobile seat production in this embodiment first fixes the backrest workpiece 510 on the worktable 100 through the backrest clamping part 200. Then, the two ends of the backrest outer contour main tube 520 are inserted into the arc-shaped connector 511 to initially fix the backrest outer contour main tube 520. Finally, the lifting rod 320 is raised to press the backrest outer contour main tube 520 tightly through the U-shaped clamp 330, thus completing the overall installation of the backrest frame 500.

[0086] Therefore, the outer contour main tube 520 of the backrest can be fixed by simply abutting the bent tube clamp 300 against the lower part of the backrest outer contour main tube 520, in conjunction with the arc-shaped connector 511. The bent tube clamp 300 has a simple structure, and the clamping and fixing process is convenient and time-saving.

[0087] It is understood that in this embodiment, the outer contour main tube 520 of the backrest can be fixedly installed simply by using the U-shaped clamp 330 to press against the backrest outer contour main tube 520 from below. However, the upward force exerted by the U-shaped clamp 330 on the backrest outer contour main tube 520 should not be too great, otherwise it will affect the accuracy of the fixed position of the backrest workpiece 510; furthermore, if the welding tool 400 continues to apply an upward force to the gap between the arc joint 511 and the backrest outer contour main tube 520 during welding, the accuracy of the position of the backrest workpiece 510 and the backrest outer contour main tube 520 will be further affected.

[0088] Therefore, in this embodiment, a lifting rod 340 is provided on the inner side of the lifting rod 320, and the lifting rod 340 is in contact with the lifting rod 320;

[0089] The lower end of the lifting rod 340 is connected to a telescopic power source (not shown). In the first state, the lifting rod 340 and the lifting rod 320 are relatively fixed; in the second state, the lifting rod 340 and the lifting rod 320 slide relative to each other.

[0090] Therefore, when the lifting rod 320 drives the U-shaped clamp 330 to push upward against the outer contour main pipe 520, if the force of the U-shaped clamp 330 pushing upward against the outer contour main pipe 520 does not exceed the threshold, the lifting rod 340 and the lifting rod 320 are relatively fixed, so the lifting rod 340 can drive the lifting rod 320 to move upward, so that the U-shaped clamp 330 further pushes against the outer contour main pipe 520; if the force of the U-shaped clamp 330 pushing upward against the outer contour main pipe 520 exceeds the threshold, the lifting rod 340 and the lifting rod 320 slide relative to each other, so that the lifting rod 340 cannot drive the lifting rod 320 to continue to move upward, so that the U-shaped clamp 330 automatically stops pushing upward against the outer contour main pipe 520.

[0091] With the above settings, when the force exerted by the U-shaped clamp 330 on the outer contour guide tube 520 of the backrest exceeds the threshold, the U-shaped clamp 330 automatically stops pushing against the outer contour guide tube 520, thus preventing excessive force from affecting the positional accuracy of the backrest workpiece 510 and the outer contour guide tube 520. Furthermore, without relying on sensors and control systems, it eliminates the possibility of the U-shaped clamp 330 exceeding the threshold force due to signal transmission lag.

[0092] It is worth noting that the telescopic power source can be an electric actuator, a hydraulic rod, or a pneumatic rod. The telescopic power source is installed below the worktable 100, and its actuating end passes through the worktable 100 and is connected to the lifting rod 340.

[0093] Specifically, the lifting base 310 has a vertically extending mounting cavity 311 inside. The lifting rod 320 is a stepped rectangular column with a large end 321 at the bottom and a small end 322 at the top. The large end 321 is slidably installed in the mounting cavity 311, and the small end 322 extends through the upper opening of the mounting cavity 311, so that the lifting rod 320 can be installed in the lifting base 310 in a vertically adjustable manner. It is understood that the U-shaped clamp 330 is fixedly installed at the upper end of the small end 322.

[0094] The lifting rod 320 has a sliding hole 323 in the center. The lifting rod 340 is slidably disposed in the sliding hole 323, and the lower end of the lifting rod 340 extends out of the sliding hole 323 and passes through the lower opening of the mounting cavity 311 so that the lifting rod 340 can slide relative to the lifting rod 320.

[0095] The outer side wall of the lifting rod 340 has a plurality of mounting holes 341 arranged in a vertical array; a sliding member 342 is provided in each mounting hole 341 and can slide relative to the mounting hole 341. Correspondingly, the inner side wall of the lifting rod 320 has a plurality of ball grooves 324 arranged in a vertical array, and the number of ball grooves 324 is greater than the number of mounting holes 341.

[0096] The end of the slider 342 away from the ball groove 324 is a columnar part, and the shape and size of the columnar part match the mounting hole 341, so that the slider 342 can slide relative to the mounting hole 341; the end of the slider 342 near the ball groove 324 is a spherical part, and the shape and size of the spherical part match the ball groove 324, so that the slider 342 can engage with the ball groove 324.

[0097] An elastic element 343 is also provided inside the mounting hole 341. One end of the elastic element 343 is fixedly connected to the mounting hole 341, and the other end is fixedly connected to the sliding member 342. Furthermore, the elastic coefficient of the elastic element 343 matches the threshold force of the U-shaped clamp 330 pushing upward against the outer contour main tube 520 of the backrest.

[0098] Therefore, when the force of the U-shaped clamp 330 pushing against the outer contour main tube 520 does not exceed the threshold, the elastic force of the elastic element 343 is greater than the pushing force, and the spherical part of the sliding member 342 remains extended, so the lifting rod 340 and the lifting rod 320 are relatively fixed; when the force of the U-shaped clamp 330 pushing against the outer contour main tube 520 exceeds the threshold, the elastic element 343 is compressed, and the spherical part of the sliding member 342 disengages from the ball groove 324 and enters the next ball groove 324, so the lifting rod 340 and the lifting rod 320 slide relative to each other.

[0099] It is worth noting that a distance sensor (not shown) may be configured on the slider 342. When the distance sensor detects that the distance between the slider 342 and the bottom wall of the mounting hole 341 has shortened, it stops driving the lifting rod 340 to move upward. Although the feedback signal from the distance sensor may be delayed, the lifting rod 320 has already automatically stopped rising, and the force of the U-shaped clamp 330 pushing the backrest outer contour main tube 520 upward will not exceed the threshold.

[0100] It is understandable that the elastic coefficient of the elastic element 343 needs to match the threshold force of the U-shaped clamp 330 pushing against the outer contour main tube 520 of the backrest. The elastic coefficient of the elastic element 343 needs to be adjusted for different working conditions.

[0101] Preferably, the elastic element 343 in this embodiment is an actively controlled spring, so as to adjust the elastic coefficient of the elastic element 343 according to different working conditions. The actively controlled spring can be an electromagnetic spring or a magnetorheological elastomer, etc., which are existing technologies. Any active spring that can adjust the elastic coefficient of the elastic element 343 according to a threshold value is within the scope of protection of this invention.

[0102] In this embodiment, the welding apparatus 400 includes a first welding tool 410 and a second welding tool 420. Both the first welding tool 410 and the second welding tool 420 are mounted on the workbench 100 and are located on both sides of the outer contour main tube 520 of the backrest. Thus, the welding apparatus of this embodiment can realize double-sided welding of the outer contour main tube 520 of the backrest, improving welding efficiency.

[0103] It is understood that in this embodiment, the outer contour main tube 520 of the backrest can be fixedly installed simply by using the U-shaped clip 330 to press against the backrest outer contour main tube 520 from below.

[0104] On the one hand, if a pair of welding tools 400 simultaneously apply an upward force to the gap between the arc-shaped joint 511 and the outer contour main tube 520 of the backrest during welding, the outer contour main tube 520 of the backrest is prone to displacement due to the lack of an upper limiting structure, which affects the accuracy of the position of the backrest workpiece 510 and the outer contour main tube 520 of the backrest.

[0105] On the other hand, the U-shaped clamp 330 does not rigidly clamp the outer contour main tube 520 of the backrest. If a pair of welding tools 400 simultaneously apply a downward force to the gap between the arc joint 511 and the outer contour main tube 520 of the backrest during welding, the outer contour main tube 520 of the backrest is also prone to shifting downward, which affects the accuracy of the position of the backrest workpiece 510 and the outer contour main tube 520 of the backrest.

[0106] For this purpose, please refer to the appendix. Figures 8-9In this embodiment, the welding needles 411 of the first welding tool 410 and the welding needles 421 of the second welding tool 420 are staggered in the vertical direction, so that during welding, the vertical component of the force applied by the first welding tool 410 to the backrest frame 500 is equal to the value of the vertical component of the force applied by the second welding tool 420 to the backrest frame 500.

[0107] Therefore, the force applied by the first welding tool 410 to the backrest frame 500 and the force applied by the second welding tool 420 to the backrest frame 500 cancel each other out in the vertical direction, so that the backrest outer contour main tube 520 is not subjected to any force in the vertical direction as a whole. As a result, the backrest outer contour main tube 520 is not easy to shift, thus avoiding affecting the positional accuracy of the backrest workpiece 510 and the backrest outer contour main tube 520.

[0108] Specifically, in the initial state, the first welding tool 410 is located on the upper side of the outer contour main pipe 520 of the backrest, and the second welding tool 420 is located on the lower side of the outer contour main pipe 520 of the backrest. That is, the first welding needle 411 starts welding from the upper end of the gap between the arc-shaped joint 511 and the outer contour main pipe 520 of the backrest, and the second welding needle 421 starts welding from the lower end of the gap between the arc-shaped joint 511 and the outer contour main pipe 520 of the backrest.

[0109] Furthermore, the first welding fixture 410 also includes a first turntable 412, and the main body of the first welding fixture 410 is fixedly mounted on the first turntable 412; the second welding fixture 420 also includes a second turntable 422, and the main body of the second welding fixture 420 is fixedly mounted on the second turntable 422. The mounting positions of the first welding fixture 410 on the first turntable 412 and the mounting positions of the second welding fixture 420 on the second turntable 422 are staggered vertically.

[0110] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A welding device for automobile seat production, comprising: a workbench; a backrest framework comprising a backrest workpiece and a backrest outer contour main pipe; a backrest clamping part installed on the upper end surface of the workbench and used for clamping and fixing the backrest workpiece of the automobile seat backrest framework; a bent pipe clamping part installed on the upper end surface of the workbench and used for clamping and fixing the backrest outer contour main pipe of the automobile seat backrest framework; a welding tool installed on the upper end surface of the workbench and used for welding the gap between the backrest workpiece and the backrest outer contour main pipe; characterized in that the upper end of the backrest workpiece is provided with an arc-shaped joint, and the radial dimension of the arc-shaped joint matches the diameter of the backrest outer contour main pipe; the bent pipe clamping part comprises: a lifting seat fixedly installed on the workbench; a lifting rod installed in the lifting seat in a liftable manner; a U-shaped clamp fixedly installed on the upper end of the lifting rod; wherein the opening of the U-shaped clamp faces upward, and the opening dimension matches the outer diameter of the backrest outer contour main pipe; the inner side of the lifting rod is provided with a jacking rod, and the jacking rod is in contact with the lifting rod; wherein the lower end of the jacking rod is drivingly connected to a telescopic power source; the inside of the lifting seat is provided with an installation cavity penetrating upward and downward, the lifting rod is a stepped rectangular column, and the lower end thereof is a large end, and the upper end thereof is a small end; the large end is slidably installed in the installation cavity, and the small end penetrates out of the upper opening of the installation cavity; the central part of the lifting rod is provided with a sliding hole, the jacking rod is slidably arranged in the sliding hole, and the lower end of the jacking rod penetrates out of the lower opening of the installation cavity; the outer side wall of the jacking rod is provided with a plurality of installation holes, and the installation holes are vertically arrayed; a sliding member slidably arranged in the installation hole is arranged in the installation hole, the inner side wall of the lifting rod is provided with a plurality of ball grooves, and the ball grooves are vertically arrayed, and the number of the ball grooves is greater than the number of the installation holes; wherein the end of the sliding member away from the ball groove is a columnar part, and the shape and dimension of the columnar part match the installation hole; the end of the sliding member close to the ball groove is a spherical part, and the shape and dimension of the spherical part match the ball groove; a resilient element is further arranged in the installation hole, one end of the resilient element is fixedly connected to the installation hole, and the other end thereof is fixedly connected to the sliding member; the elastic coefficient of the resilient element matches the threshold value of the force of the U-shaped clamp upwardly abutting against the backrest outer contour main pipe; the welding tool comprises a first welding tool and a second welding tool, and the first welding needle of the first welding tool and the second welding needle of the second welding tool are staggered arranged in the upward and downward direction; when welding, the vertical component of the force exerted by the first welding tool on the backrest framework is equal to the vertical component of the force exerted by the second welding tool on the backrest framework.

2. The welding device for automobile seat production according to claim 1, characterized in that, the backrest clamping part comprises a positioning member and a clamping mechanism; wherein the positioning member comprises: a cross pipe accommodating seat fixedly installed on the workbench and provided with a U-shaped groove, and the workpiece cross pipe is overlapped in the U-shaped groove; a reinforcing plate accommodating seat fixedly installed on the workbench and provided with a U-shaped groove, and the workpiece reinforcing plate is overlapped in the U-shaped groove; a hanging part positioning part fixedly installed on the workbench and provided with a hanging column, and the hanging part is hung on the hanging column; the clamping mechanism is fixedly installed on the workbench and configured as a pair, and respectively clamps and fixes a pair of profile side plates.

3. The welding device for automobile seat production according to claim 2, characterized in that, the clamping mechanism comprises a support fixedly installed on the workbench, and the support is located on the inner side of the backrest workpiece; The outer side wall of the support is provided with an upper telescopic rod and a lower telescopic rod, the action end of the upper telescopic rod is provided with an inner clamp head, and the action end of the lower telescopic rod is provided with an outer clamp head; The inner clamp head is located at the inner side of the backrest workpiece, and the outer clamp head is located at the outer side of the backrest workpiece; When the upper telescopic rod and the lower telescopic rod are elongated together, the inner clamp head and the outer clamp head are close to each other; when the upper telescopic rod and the lower telescopic rod are shortened together, the inner clamp head and the outer clamp head are away from each other.

4. The welding device for automobile seat production according to claim 3, characterized in that, The inner clamp head is fixedly installed at the end of the action end of the upper telescopic rod; The outer clamp head is L-shaped, the inner side wall of the upper end of the vertical segment of the outer clamp head is provided with a clamping part, and the end of the horizontal segment is hingedly connected with the end of the action end of the lower telescopic rod; The clamping mechanism further comprises a hinged seat and a connecting rod, one end of the connecting rod is hingedly connected with the hinged seat, and the other end of the connecting rod is hingedly connected with the vertical segment.

5. The welding device for automobile seat production according to claim 1, characterized in that, In the first state, the jacking rod is relatively fixed with the lifting rod; in the second state, the jacking rod is relatively slid with the lifting rod.

6. The welding device for automobile seat production according to claim 5, characterized in that, The first welding tool and the second welding tool are both installed on the workbench and are respectively located on both sides of the backrest outer contour main pipe.

7. The welding device for automobile seat production according to claim 6, characterized in that, In the initial state, the first welding tool is located on the obliquely upper side of the backrest outer contour main pipe, and the second welding tool is located on the obliquely lower side of the backrest outer contour main pipe; The first welding tool further comprises a first turntable, and the main body of the first welding tool is fixedly installed on the first turntable; The second welding tool further comprises a second turntable, and the main body of the second welding tool is fixedly installed on the second turntable; The installation position of the first welding tool on the first turntable and the installation position of the second welding tool on the second turntable are staggered up and down.

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