Welding tool for sofa support

Abstract

The invention relates to the technical field of welding tools, in particular to a sofa support welding tool which comprises a bottom plate, a supporting column, a top plate, an abutting structure, a first positioning structure, a second positioning structure, a shifting structure, a position changing structure, a welding gun, a second supporting seat, a third driving assembly and two placing tables. Support feet can be taken and placed during welding, the welding auxiliary time is shortened, and the efficiency is improved; the second positioning structure can accurately position the supporting plate, the displacement structure drives the second positioning structure to move so that the second positioning structure can not make contact with the supporting plate, and therefore the welded support feet can be taken out conveniently. The abutting structure can accurately position the supporting pipe through the first positioning structure before fixing the supporting pipe, the welding quality is guaranteed, the device can adapt to supporting plates and supporting pipes of different sizes, and the applicability is high.

Description

Technical Field

[0001] The invention relates to the technical field of welding tooling, in particular to a welding tooling for a sofa bracket. Background Art

[0002] As the core load-bearing component of the sofa structure, the sofa frame shoulders the important mission of supporting the sofa's main frame, distributing the body's weight, and ensuring the overall stability of the sofa. Its structural strength and assembly precision directly affect the sofa's service life and safety. The foot is the key support unit in the composition of the sofa frame, mainly composed of a support tube and a support plate. The support tube bears the longitudinal load-bearing function, while the support plate expands the load-bearing area by contacting the ground, preventing the sofa from tilting or sinking during use. Therefore, the welding quality of the support tube and support plate, especially the relative positioning accuracy of the two, is crucial to the load-bearing performance of the foot.

[0003] However, traditional welding equipment relies heavily on manual operation during the pre-welding positioning phase: the operator must manually place the support tube on top of the support plate and use the positioning block on the workbench to achieve initial positioning. However, during this process, a slight gap can easily form between the support tube and the positioning block due to uneven placement force and angle deviation, resulting in a certain deviation in the relative position of the two. This positioning error can adversely affect subsequent welding and assembly. Moreover, after the welding of a bracket leg is completed, the operator must spend a certain amount of time manually removing the welded workpiece from the tooling, and then re-place the new support plate and support tube, and adjust the positioning before starting the next welding. This process is relatively time-consuming, resulting in an excessively high proportion of auxiliary time for a single welding, which seriously restricts the efficiency of mass production. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a welding tool for a sofa bracket.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a welding tool for a sofa bracket, comprising a bottom plate, two second support seats are fixedly connected to the bottom plate, the top ends of the second support seats are rotatably connected to a placement platform, and a transposition structure is provided on the bottom plate; The transposition structure includes a first support seat and a second drive assembly, the first support seat is fixedly connected to the base plate, the second drive assembly is installed on the first support seat, one of the gears is fixedly connected to the output end of the second drive assembly, the first support seat is fixedly connected to the first connecting shaft, the first connecting shaft is rotatably connected to the swing arm, the swing arm is fixedly connected to another gear, the two gears are meshed with each other, the swing arm is rotatably connected to the second connecting shaft, the second connecting shaft is fixedly connected to the mounting plate, the welding gun is installed on the mounting plate, one of the synchronous wheels is fixedly connected to the second connecting shaft, the first connecting shaft is fixedly connected to the other synchronous wheel, and the same synchronous belt is wrapped around the two synchronous wheels.

[0006] Specifically, a third driving assembly is installed on the second supporting seat, and an output end of the third driving assembly is fixedly connected to the bottom end of the placement table.

[0007] Specifically, four support columns are fixedly connected to the bottom plate, and the top ends of the four support columns are fixedly connected to the same top plate. A pressure structure is provided on the top plate, and the pressure structure includes a first drive assembly and a moving rod. Two first drive assemblies are installed on the top side of the top plate, and the output end of the first drive assembly is fixedly connected to the moving rod, and the bottom end of the moving rod is rotatably connected to the pressure rod.

[0008] Specifically, the cross section of the entire supporting rod is T-shaped, and the center of the supporting rod and the rotation center of the placement platform at its bottom end are on the same straight line.

[0009] The top end face of said sliding arm is fixedly provided with a toothed connecting strip which is cooperatively connected with said toothed connecting strip.

[0010] Specifically, the two vertical rods located on both sides of the moving rod are symmetrically distributed about the middle of the moving rod, and the two guide columns are symmetrically distributed about the middle of the first screw rod.

[0011] Specifically, the placement table is provided with a second positioning structure, which includes a movable seat and a slider. Four movable seats are slidably connected to the placement table, and the interior of the movable seat is slidably connected to the slider, and the slider is fixedly connected to the abutment plate.

[0012] Specifically, a second screw is rotatably connected to the movable seat, the second screw is threadedly connected to the slider, and one end of the second screw is fixedly connected to a knob.

[0013] Specifically, the placement table is provided with a shift structure, which includes a turntable and a guide groove. The placement table is rotatably connected to the turntable, and the turntable is provided with four guide grooves. The bottom side of the movable seat is fixedly connected to a guide shaft, and the guide shaft extends to the inside of the adjacent guide groove. A handle is fixedly connected to the turntable, and a card block is slidably connected to the handle. Two card slots are provided on the outside of the turntable, one end of the card block is engaged with one of the card slots, and the other end of the card block is fixedly connected to a pull rod.

[0014] Specifically, a second spring is sleeved on the outside of the clamping block, a connecting ring is fixedly connected to the clamping block, one end of the second spring abuts against the connecting ring, and the other end of the second spring abuts against the handle.

[0015] The beneficial effects of the present invention are: (1) The welding tool for a sofa support described in the present invention has two placement tables at the top of the bottom plate. When welding the support legs on one of the placement tables, the unwelded support plate and support tube can be placed on the other placement table. When the welding of the support legs on one of the placement tables is completed, the welding gun can be moved from one side of the placement table to the other side of the placement table under the action of the transposition structure, and the support legs on the other placement table can be welded. During this process, the welded support legs can be removed from one of the placement tables. After removal, the support plate and support tube to be welded can be placed on one of the placement tables. In this way, the bracket legs can be taken and placed while welding. This cycle can be repeated, thereby shortening the time of welding auxiliary work and improving production efficiency.

[0016] (2) The welding fixture for a sofa support described in the present invention can accurately position the support plate placed on the placement table through the second positioning structure to avoid deviation in the position of the support plate. After welding is completed, the second positioning structure and the support plate can be prevented from interfering with each other under the action of the shifting structure, thereby allowing the support plate to have a larger movable space and avoiding the second positioning structure from blocking the support plate when the support foot is removed, thereby facilitating the removal of the support foot after welding.

[0017] (3) The welding tool for a sofa support described in the present invention can place the support tube on the top of the support tube after the support plate is placed, and then the pressing structure can abut and fix the top of the support tube. Before the pressing structure abuts and fixes the top of the support tube, the first positioning structure can accurately position the support tube, thereby avoiding position deviation between the support tube and the support plate, and effectively ensuring the quality of the finished product after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 A schematic structural diagram of the overall structure of a preferred embodiment of a welding tool for a sofa bracket provided by the present invention; Figure 2 for Figure 1 An enlarged schematic diagram of part A is shown; Figure 3 It is a schematic diagram of the connection structure between the moving rod and the supporting rod of the present invention; Figure 4 for Figure 3 An enlarged schematic diagram of part B is shown; Figure 5 for Figure 4 The enlarged schematic diagram of part C is shown Figure 6 Schematic diagram of the connection structure between the turntable and the guide groove of the present invention; Figure 7 for Figure 6 An enlarged schematic diagram of portion D is shown; Figure 8 Schematic diagram of the connection structure between the guide rail and the slide seat of the present invention; Figure 9 It is a schematic diagram of the connection structure between the guide column and the limiting ring of the present invention.

[0020] In the figure: 1. bottom plate; 2. support column; 3. top plate; 4. pressing structure; 401. first driving assembly; 402. moving rod; 403. pressing rod; 5. first positioning structure; 501. guide rail; 502. slide seat; 503. vertical rod; 504. connecting rod; 505. first screw; 506. connecting block; 507. guide column; 508. limiting ring; 509. connecting seat; 510. roller; 511. first spring; 6. second positioning structure; 601. moving seat; 602. slide block; 603. pressing plate; 604. knob; 605. second screw; 7. Shifting structure; 701. Turntable; 702. Guide groove; 703. Guide shaft; 704. Handle; 705. Pull rod; 706. Block; 707. Slot; 708. Connecting ring; 709. Second spring; 8. Transposition structure; 801. First support seat; 802. Second drive assembly; 803. Gear; 804. First connecting shaft; 805. Swing arm; 806. Second connecting shaft; 807. Mounting plate; 808. Synchronous wheel; 809. Synchronous belt; 9. Welding gun; 10. Second support seat; 11. Third drive assembly; 12. Placement table. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] like Figure 1 、 Figure 3 、 Figure 4 and Figure 8 As shown, a welding tool for a sofa bracket of the present invention includes a base plate 1, two second support seats 10 are fixedly connected to the base plate 1, the top ends of the second support seats 10 are rotatably connected to a placement table 12, and a transposition structure 8 is provided on the base plate 1; The transposition structure 8 includes a first support base 801 and a second drive assembly 802. The first support base 801 is fixedly connected to the bottom plate 1, and the second drive assembly 802 is installed on the first support base 801. One of the gears 803 is fixedly connected to the output end of the second drive assembly 802. The first support base 801 is fixedly connected to the first connecting shaft 804, and the first connecting shaft 804 is rotatably connected to a swing arm 805. The swing arm 805 is fixedly connected to another gear 803. The two gears 803 are meshed with each other. The swing arm 805 is rotatably connected to the second connecting shaft 806. The second connecting shaft 806 is fixedly connected to a mounting plate 807. The mounting plate 807 is installed with a welding gun 9. One of the synchronous wheels 808 is fixedly connected, another synchronous wheel 808 is fixedly connected to the first connecting shaft 804, the two synchronous wheels 808 are wrapped with the same synchronous belt 809, and the second support seat 10 is installed with a third drive component 11, and the output end of the third drive component 11 is fixedly connected to the bottom end of the placement table 12, that is: by arranging two placement tables 12 at the top of the bottom plate 1, when the bracket feet on one of the placement tables 12 are welded, the unwelded support plate and support tube can be placed on the other placement table 12, and when the bracket feet on one of the placement tables 12 are welded, the second drive component 802 can be started, and the output end of the second drive component 802 rotates to drive one of them The first gear 803 rotates, and the rotation of one gear 803 drives the other gear 803 to rotate. The rotation of the other gear 803 drives the swing arm 805 to rotate. The rotation of the swing arm 805 drives the second connecting shaft 806 to move. The second connecting shaft 806 rotates on the swing arm 805 under the action of the synchronous wheel 808 and the synchronous belt 809 while following the movement of the swing arm 805. The angle of rotation is the same as that of the swing arm 805, but in the opposite direction. Therefore, the orientation of the mounting plate 807 will not change, and the orientation of the welding gun 9 will not change. Therefore, when the swing arm 805 rotates a certain angle, one end of the welding gun 9 will be located on one side of the other placement table 12 in the same direction. At this time, the second driving group The output end of component 802 stops rotating, and then the bracket foot on another placement table 12 can be welded. During this process, the welded bracket foot can be removed from one of the placement tables 12, and after removal, the support plate and support tube to be welded can be placed on one of the placement tables 12. This cycle can be repeated to realize the taking and placing of the bracket foot while welding, thereby shortening the time of welding auxiliary work and improving production efficiency. During the welding process, the third drive component 11 can be started, and the rotation of the output end of the third drive component 11 will drive the placement table 12 to rotate, and the rotation of the placement table 12 will drive the bracket foot to rotate. Therefore, when the position of the welding gun 9 remains unchanged, the full welding of the bracket foot can be achieved.

[0023] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 and Figure 9As shown, four support columns 2 are fixedly connected to the bottom plate 1, and the top ends of the four support columns 2 are fixedly connected to the same top plate 3. A pressing structure 4 is provided on the top plate 3, and the pressing structure 4 includes a first driving component 401 and a moving rod 402. Two first driving components 401 are installed on the top side of the top plate 3, and the output end of the first driving component 401 is fixedly connected to the moving rod 402, and the bottom end of the moving rod 402 is rotatably connected to the pressing rod 403. The overall cross-section of the pressing rod 403 is a T-shaped structure, and the center of the pressing rod 403 and the rotation center of the placement platform 12 at its bottom are on the same straight line. A first positioning structure 5 is provided on the top plate 3, and the first positioning structure 5 includes a guide rail 501 and a slide seat 502. A guide rail 501 is provided on both sides of the moving rod 402, and four The guide rail 501 is fixedly connected to the top plate 3, and a slide 502 is slidably connected to the guide rail 501. The bottom side of the slide 502 is fixedly connected to the vertical rod 503. Both sides of the movable rod 402 are rotatably connected to the connecting rod 504. One end of the connecting rod 504 is rotatably connected to the adjacent vertical rod 503. A first screw 505 is threadedly connected to the vertical rod 503. One end of the first screw 505 is rotatably connected to a connecting block 506. Two guide columns 507 are slidably connected to the connecting block 506. The guide column 507 is slidably connected to the vertical rod 503. A limiting ring 508 is fixedly connected to the guide column 507. One side of the limiting ring 508 conflicts with the connecting block 506. One end of the two guide columns 507 is fixedly connected to the same connecting seat 509. There are two rollers 510 connected in rotation, and a first spring 511 is provided on the outer sleeve of the guide column 507. One end of the first spring 511 abuts against the connecting seat 509, and the other end of the first spring 511 abuts against the connecting block 506. The two vertical rods 503 on both sides of the moving rod 402 are symmetrically distributed about the middle of the moving rod 402, and the two guide columns 507 are symmetrically distributed about the middle of the first screw 505, that is, when the support plate is placed on the placement table 12, the support tube can be placed on the top of the support plate, and then by starting the first drive component 401 (preferably a cylinder), the extension of the first drive component 401 will drive the moving rod 402 to move, and the abutting rod 403 will move toward the top of the support tube together with the moving rod 402, and the moving rod 40 When the vertical rod 503 moves, the two connecting rods 504 on both sides thereof will simultaneously drive the two vertical rods 503 on both sides to move. When the vertical rod 503 moves, the slide 502 will slide on the guide rail 501, thereby being able to guide the movement of the vertical rod 503. The movement of the vertical rod 503 will drive the connecting seat 509 to move together. The movement of the connecting seat 509 will drive the two rollers 510 to move. The two rollers 510 will contact the support tube during the movement. When the four rollers 510 do not contact the support tube at the same time, the first spring 511 has a certain elastic force, which is greater than the friction between the support tube and the support plate. Therefore, the first spring 511 will not shrink. When the four rollers 510 contact the outer side of the support tube at the same time, the precise positioning of the support tube is achieved.Then, as the moving rod 402 continues to move, the guide column 507 will slide on the connecting block 506 and the vertical rod 503, and the first spring 511 will contract. The two guide columns 507 can simultaneously slide on the vertical rod 503 to guide the movement of the connecting seat 509, thereby preventing the direction of the connecting seat 509 from changing. When the bottom end of the supporting rod 403 is tightly pressed against the top end of the support tube, the first driving assembly 401 stops extending. At this time, the support tube and the support plate are fixed, and before fixing, the four rollers 510 are in contact with the support tube to achieve accurate positioning of the support tube, thereby avoiding position deviation between the support tube and the support plate, effectively ensuring the quality of the finished product after welding, and the initial position of the roller 510 can be adjusted by rotating the first screw 505, thereby facilitating accurate positioning of support tubes of different diameters, effectively improving the applicability of the device.

[0024] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, a second positioning structure 6 is provided on the placement table 12, and the second positioning structure 6 includes a moving seat 601 and a slider 602. Four moving seats 601 are slidably connected to the placement table 12, and the inner sliding connection of the moving seat 601 is connected to the slider 602. The slider 602 is fixedly connected to the plate 603. The moving seat 601 is rotatably connected to the second screw 605, and the second screw 605 is threadedly connected to the slider 602. One end of the second screw 605 is fixedly connected to the knob 604. The placement table 12 is provided with a shift structure 7, and the shift structure 7 includes a turntable 701 and a guide groove 702. The placement table 12 is rotatably connected to the turntable 701, and the turntable 701 is provided with four guide grooves 702. The moving seat 60 1 is fixedly connected to a guide shaft 703 on the bottom side, and the guide shaft 703 extends to the inside of the adjacent guide groove 702. A handle 704 is fixedly connected to the turntable 701, and a block 706 is slidably connected to the handle 704. Two slots 707 are provided on the outside of the turntable 701, and one end of the block 706 is engaged with one of the slots 707. The other end of the block 706 is fixedly connected to a pull rod 705, and a second spring 709 is provided on the outside of the block 706. A connecting ring 708 is fixedly connected to the block 706, and one end of the second spring 709 abuts against the connecting ring 708, and the other end of the second spring 709 abuts against the handle 704, that is, when the support plate is placed on the placement table 12 and will simultaneously engage with the four The two abutments 603 interfere with each other, thereby achieving accurate positioning of the support plate and avoiding deviation in the position of the support plate. By turning the second screw 605 by hand-held knob 604, the rotation of the second screw 605 will thread-drive the slider 602 to slide on the moving seat 601, and the abutment 603 will move with the slider 602, thereby adjusting the initial position of the abutment 603. By adjusting the initial position of the abutment 603, it is convenient to position support plates of different sizes, thereby effectively improving the applicability of the device. When the bracket foot needs to be removed after welding is completed, the pull rod 705 can be pulled away from the card slot 707, and the second spring 709 will contract. When one end of the block 706 is aligned with one of the When the two slots 707 are not engaged, the turntable 701 can be rotated by holding the handle 704. When the turntable 701 rotates, the four guide shafts 703 will move simultaneously inside the guide grooves 702. When the guide shafts 703 move, the movable seat 601 will slide on the placement table 12, and the support plate 603 will move with the movable seat 601. As the turntable 701 rotates, one end of the block 706 will engage with another slot 707 under the action of the second spring 709. At this time, the turntable 701 cannot rotate, and at the same time, the multiple support plates 603 do not conflict with the support plate. Therefore, when taking out the bracket foot, the support plate 603 can be avoided from resisting the support plate, thereby facilitating the removal of the bracket foot after welding.

[0025] When the present invention is in use, two placement platforms 12 are set at the top of the base plate 1. When the bracket feet on one of the placement platforms 12 are welded, the unwelded support plate and support tube can be placed on the other placement platform 12. When the support plate is placed on the placement platform 12, it will interfere with the four abutment plates 603 at the same time, so that the support plate can be accurately positioned to avoid deviation in the position of the support plate. When the support plate is placed on the placement platform 12, the support tube can be placed on the top of the support plate, and then by starting the first drive component 401, the extension of the first drive component 401 will drive the moving rod 402 to move, and the abutment rod 403 will move toward the top of the support tube together with the moving rod 402. When the four rollers 510 do not contact the support tube at the same time, the first spring 511 has a certain elastic force, and it is greater than the friction force between the support tube and the support plate, so the first spring 511 will not shrink. When the four rollers 510 conflict with the outer side of the support tube at the same time, the support tube can be accurately supported. After the first spring 511 is tightened and the second spring 512 is tightened, the first spring 511 is tightened and the second spring 512 is tightened, so that the first spring 511 is tightened and the second spring 512 is tightened. During the welding process, the third driving component 11 (preferably a motor) can be started, and the rotation of the output end of the third driving component 11 will drive the placement table 12 to rotate, and the rotation of the placement table 12 will drive the bracket foot to rotate. Therefore, when the position of the welding gun 9 remains unchanged, the bracket foot can be fully welded. When the welding of the bracket foot on one of the placement tables 12 is completed, the second driving component 802 (preferably a motor) can be started, and the output end of the second driving component 802 can rotate to drive one of the first gears 803 to rotate. The rotation of one gear 803 will drive another gear 803 to rotate. The rotation of the other gear 803 will drive the swing arm 805 to rotate. The rotation of the swing arm 805 will drive the second connecting shaft 806 to move.The second connecting shaft 806 rotates on the swing arm 805 under the action of the synchronous wheel 808 and the synchronous belt 809 as the swing arm 805 moves, and the angle of rotation is the same as that of the swing arm 805 and the direction is opposite, so that the orientation of the mounting plate 807 will not change, and the orientation of the welding gun 9 will not change. Therefore, when the swing arm 805 rotates to a certain angle, one end of the welding gun 9 will be located on the side of the other placement platform 12 in the same direction. At this time, the output end of the second driving component 802 stops rotating, and then the bracket foot on the other placement platform 12 can be welded. During this process, the welded bracket foot can be removed from one of the placement platforms 12, and after removal, the support plate and support tube to be welded can be placed on one of the placement platforms 12. In this way, the bracket foot can be taken out and placed while welding, thereby shortening the time of welding auxiliary work and improving production efficiency. In the process of taking out the bracket foot, the pull rod 705 can be pulled away from the slot 707, and the second spring 709 will shrink. When one end of the block 706 is not engaged with one of the slots 707, the turntable 701 can be rotated by holding the handle 704, and the turntable 70 During the rotation, the four guide shafts 703 will simultaneously move inside the guide grooves 702. As the guide shafts 703 move, the movable seat 601 will slide on the placement table 12, and the abutment plate 603 will move along with the movable seat 601. As the turntable 701 rotates, one end of the clamping block 706 will engage with another clamping groove 707 under the action of the second spring 709. At this time, the turntable 701 cannot rotate, and the multiple abutment plates 603 do not interfere with the support plate. Therefore, when removing the bracket foot, the abutment plates 603 can be prevented from blocking the support plate, thereby facilitating the removal of the bracket foot after welding. By rotating the second screw 605 by hand-held knob 604, the second screw 605 will threadably drive the slider 602 to slide on the movable base 601, and the support plate 603 will move along with the slider 602, thereby adjusting the initial position of the support plate 603. By adjusting the initial position of the support plate 603, it is convenient to position support plates of different sizes, thereby effectively improving the applicability of the device. By rotating the first screw 505, the initial position of the roller 510 can be adjusted, thereby facilitating the precise positioning of support tubes of different diameters, thereby effectively improving the applicability of the device.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0027] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A welding tool for a sofa bracket, characterized in that: It comprises a bottom plate (1), two second support seats (10) are fixedly connected to the bottom plate (1), the top ends of the second support seats (10) are rotatably connected to a placement table (12), and a transposition structure (8) is provided on the bottom plate (1); The transposition structure (8) comprises a first support seat (801) and a second drive assembly (802), wherein the first support seat (801) is fixedly connected to the bottom plate (1), the second drive assembly (802) is mounted on the first support seat (801), one of the gears (803) is fixedly connected to the output end of the second drive assembly (802), the first support seat (801) is fixedly connected to a first connecting shaft (804), the first connecting shaft (804) is rotatably connected to a swing arm (805), and the swing arm (805) is fixedly connected to a Another gear (803), the two gears (803) are meshed with each other, the swing arm (805) is rotatably connected to a second connecting shaft (806), the second connecting shaft (806) is fixedly connected to a mounting plate (807), a welding gun (9) is mounted on the mounting plate (807), the second connecting shaft (806) is fixedly connected to one of the synchronous wheels (808), the first connecting shaft (804) is fixedly connected to another synchronous wheel (808), and the two synchronous wheels (808) are wound with the same synchronous belt (809).

2. The welding tool for a sofa bracket according to claim 1, characterized in that: A third drive assembly (11) is mounted on the second support seat (10), and an output end of the third drive assembly (11) is fixedly connected to the bottom end of the placement table (12).

3. The welding tool for a sofa bracket according to claim 1, characterized in that: Four support columns (2) are fixedly connected to the bottom plate (1), and the top ends of the four support columns (2) are fixedly connected to the same top plate (3). A pressing structure (4) is provided on the top plate (3), and the pressing structure (4) comprises a first driving assembly (401) and a moving rod (402). Two first driving assemblies (401) are installed on the top side of the top plate (3), and the output end of the first driving assembly (401) is fixedly connected to the moving rod (402), and the bottom end of the moving rod (402) is rotatably connected to the pressing rod (403).

4. The welding tool for a sofa bracket according to claim 3, characterized in that: The entire cross-section of the support rod (403) is T-shaped, and the center of the support rod (403) and the rotation center of the placement platform (12) at its bottom end are on the same straight line.

5. The welding tool for a sofa bracket according to claim 3, characterized in that: The top plate (3) is provided with a first positioning structure (5), which includes a guide rail (501) and a slide (502). A guide rail (501) is provided on both sides of the movable rod (402), and the four guide rails (501) are fixedly connected to the top plate (3). The guide rail (501) is slidably connected to the slide (502), and the bottom side of the slide (502) is fixedly connected to the vertical rod (503). Both sides of the movable rod (402) are rotatably connected to a connecting rod (504), one end of the connecting rod (504) is rotatably connected to the adjacent vertical rod (503), and a first screw rod (505) is threadedly connected to the vertical rod (503), and one end of the first screw rod (505) is rotatably connected to the connecting rod (504). A connecting block (506) is provided, wherein two guide posts (507) are slidably connected to the connecting block (506), the guide posts (507) are slidably connected to the vertical rod (503), a limiting ring (508) is fixedly connected to the guide post (507), one side of the limiting ring (508) is in contact with the connecting block (506), one end of the two guide posts (507) is fixedly connected to the same connecting seat (509), two rollers (510) are rotatably connected to the connecting seat (509), a first spring (511) is provided on the outside of the guide post (507), one end of the first spring (511) is in contact with the connecting seat (509), and the other end of the first spring (511) is in contact with the connecting block (506).

6. The welding tool for a sofa bracket according to claim 5, characterized in that: The two vertical rods (503) located on both sides of the moving rod (402) are symmetrically distributed about the middle of the moving rod (402), and the two guide columns (507) are symmetrically distributed about the middle of the first screw rod (505).

7. The welding tool for a sofa bracket according to claim 1, characterized in that: The placement platform (12) is provided with a second positioning structure (6), the second positioning structure (6) comprising a movable seat (601) and a slider (602), four movable seats (601) are slidably connected to the placement platform (12), the interior of the movable seat (601) is slidably connected to the slider (602), and the slider (602) is fixedly connected to a support plate (603).

8. The welding tool for a sofa bracket according to claim 7, characterized in that: A second screw rod (605) is rotatably connected to the movable seat (601), the second screw rod (605) is threadedly connected to the slider (602), and one end of the second screw rod (605) is fixedly connected to a knob (604).

9. The welding tool for a sofa bracket according to claim 7, characterized in that: The placement table (12) is provided with a shift structure (7), and the shift structure (7) includes a turntable (701) and a guide groove (702). The placement table (12) is rotatably connected to the turntable (701), and the turntable (701) is provided with four guide grooves (702). The bottom side of the movable seat (601) is fixedly connected to a guide shaft (703), and the guide shaft (703) extends to the inside of the adjacent guide groove (702). The turntable (701) is fixedly connected to a handle (704), and the handle (704) is slidably connected to a clamping block (706). Two clamping grooves (707) are provided on the outer side of the turntable (701), and one end of the clamping block (706) is engaged with one of the clamping grooves (707), and the other end of the clamping block (706) is fixedly connected to a pull rod (705).

10. The welding tool for a sofa bracket according to claim 9, characterized in that: The outer sleeve of the clamping block (706) is provided with a second spring (709), and the clamping block (706) is fixedly connected to a connecting ring (708), one end of the second spring (709) abuts against the connecting ring (708), and the other end of the second spring (709) abuts against the handle (704).

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