Seat frame pipe joint welding device and method thereof

Abstract

The present application relates to the technical field of butt welding, more particularly, it relates to a seat frame pipe joint welding device and method thereof, which comprises a base, and an adjusting mechanism is arranged on the base, a clamp tool and an axis positioning mechanism are fixedly installed on the adjusting mechanism, and the axis positioning mechanism is located at the joint welding position of the workpiece on the clamp tool, a welding robot is arranged on one side of the base, and the welding robot is used for welding the joint of the workpiece on the clamp tool, the adjusting mechanism comprises a supporting seat arranged on the base, a first adjusting assembly arranged on one side of the supporting seat, and a second adjusting assembly arranged on the first adjusting assembly, the present application solves the problem that the existence of errors in the joint axis of the pipe during welding will reduce the welding quality, and when the model of the seat frame pipe is replaced, the replacement of the tool clamp needs to re-edit the welding robot path program, thereby affecting the production efficiency and increasing the labor cost.

Description

Technical Field

[0001] This invention relates to the field of joint welding technology, and more specifically, to a joint welding device and method for seat frame tubular components. Background Technology

[0002] In the production process of seat frame tubing, joint welding is a crucial step. However, existing joint welding technologies have several problems that urgently need to be solved, which seriously affect welding quality and production efficiency.

[0003] First, deviations often occur during the bending process of pipe fittings, which directly lead to errors in the joint axis. In addition, when the fixtures rigidly clamp the pipe fittings, uneven clamping force or deviations in clamping position can also cause errors in the joint axis of the pipe fittings, further affecting the accuracy and stability of welding.

[0004] Secondly, there are many types and models of seat frame tubing. When different models of tubing need to be replaced for welding, the tooling fixtures often need to be changed as well. However, each time the tooling fixtures are changed, the welding path program of the welding robot needs to be re-edited because the joint position changes. This process is not only time-consuming and labor-intensive, reducing production efficiency, but also requires highly skilled personnel with programming skills to complete, increasing the company's labor costs.

[0005] To address the aforementioned issues, a welding device and method for joining seat frame tubes are proposed. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the problems existing in the prior art, the present invention provides a welding device and method for the joint of seat frame tubes, which solves the problems mentioned in the background art, such as the reduction of welding quality due to errors in the joint axis of the tubes during welding, and the need to re-edit the welding robot path program when changing the model of the seat frame tubes, thereby affecting production efficiency and increasing labor costs.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution: a seat frame tube fitting welding device, comprising a base, wherein an adjustment mechanism is provided on the base, a fixture and an axis positioning mechanism are fixedly installed on the adjustment mechanism, and the axis positioning mechanism is located at the joint welding point of the workpiece on the fixture, and a welding robot is provided on one side of the base, and the welding robot is used to weld the joint of the workpiece on the fixture.

[0010] The adjustment mechanism includes a support seat disposed on the base, a first adjustment component disposed on one side of the support seat, and a second adjustment component disposed on the first adjustment component, wherein the fixture is fixedly connected to the second adjustment component;

[0011] The axial positioning mechanism includes a main positioning component disposed on the support base, a secondary positioning component rotatably mounted on the main positioning component, and a linkage component disposed on the main positioning component for driving the secondary positioning component.

[0012] The present invention is further configured such that the main positioning component includes a mounting base fixedly installed on the support base, a main positioning ring disposed on the mounting base, and a locking member disposed on the outer wall of the main positioning ring at the end away from the mounting base;

[0013] The main positioning rings are arranged in two sets symmetrically about the upper and lower ends of the mounting base.

[0014] The present invention is further configured such that the secondary positioning component includes a secondary positioning ring rotatably mounted on the main positioning ring, a locking block disposed on the outer wall of the secondary positioning ring away from the mounting base, and a first rotating ear disposed on the circumferential side wall of the secondary positioning ring near the rotatably mounted end;

[0015] The locking block and locking member are locked together, and the first rotating ear and the linkage assembly are rotatably connected.

[0016] The invention is further configured such that the locking member includes a drive handle rotatably mounted on the circumferential sidewall of the main positioning ring, and a locking block disposed on the drive handle and matching the locking block.

[0017] The present invention is further configured such that a plug hole is provided at the center of the inner wall of the main positioning ring, and a second rotating lug is provided on the circumferential side wall of the main positioning ring;

[0018] The linkage component includes a drive member movably disposed within the insertion hole, a rocker plate rotatably mounted on the second rotating ear, and a connecting rod rotatably mounted on the end of the rocker plate away from the drive member. The end of the connecting rod away from the rocker plate is rotatably connected to the first rotating ear on the secondary positioning ring.

[0019] The present invention is further configured such that the mounting base has a movable groove, and the connecting rod movably passes through the movable groove;

[0020] A return spring is sleeved on the connecting rod, and the two ends of the return spring respectively abut against the outer wall of the mounting base and the rotating end of the connecting rod near the rocker.

[0021] The present invention is further configured such that both the main positioning ring and the secondary positioning ring are provided with threaded holes, and an adjusting bolt is installed in the threaded hole;

[0022] The driving component includes an anti-rotation rod movably disposed within the insertion hole, an adjusting rod threaded onto one end of the anti-rotation rod, and an anti-detachment block disposed at the end of the adjusting rod away from the anti-rotation rod. The invention is further configured such that the first adjusting assembly includes an electric slide table disposed on one side of the support base, and a support plate disposed on the electric slide table.

[0023] The present invention is further configured such that the second adjustment component includes a guide rod and a drive screw disposed on the support plate, a drive motor disposed on the top of the support plate and fixedly connected to one end of the drive screw, and a fixed seat slidably mounted on the guide rod;

[0024] The fixed base and the drive screw are connected by a threaded drive.

[0025] This invention also provides the following technical solution: a method for welding the joints of seat frame tubes, employing the aforementioned welding device for welding the joints of seat frame tubes, and...

[0026] S1. Select and fix the appropriate clamping fixtures according to the pipe fitting model to ensure that they correspond to the welding path;

[0027] S2. Start the adjustment mechanism to precisely adjust the position of the fixture tooling to ensure that the pipe fitting end corresponds to the axial positioning mechanism.

[0028] S3. Place the pipe fitting, and the linkage component drives the secondary positioning ring to close, positioning the pipe fitting's shaft center;

[0029] S4. Start the welding robot and weld according to the preset path;

[0030] S5. After welding is completed, remove the pipe fittings and check the welding quality.

[0031] (III) Beneficial Effects

[0032] Compared with the prior art, the present invention provides a welding device and method for the joint of seat frame tubes, which has the following beneficial effects:

[0033] 1. The present invention, through the design of the axial positioning mechanism, can effectively correct the axial deviation of the workpiece during bending and adapt to the axial error that may be caused by the rigid clamping of the fixture. Through the annular closed positioning of two sets of main positioning rings and auxiliary positioning rings, it ensures that the axial centers of the two ends of the pipe fitting are the same, thereby significantly improving the quality of the joint welding.

[0034] 2. In this invention, the position of the fixture can be precisely adjusted by the cooperation of the adjustment mechanism and the axis positioning mechanism, ensuring that the pipe fitting end is completely aligned with the welding path of the welding robot. There is no need to re-edit the welding path program of the welding robot, which allows the equipment to be put into production quickly. This design not only improves production efficiency, but also reduces the demand for top-notch programming talents, thereby reducing the company's labor costs. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the welding device for the joint of the seat frame tubing.

[0036] Figure 2 This is a schematic diagram of the adjustment mechanism and the shaft positioning mechanism.

[0037] Figure 3 This is a schematic diagram of the shaft positioning mechanism.

[0038] Figure 4 A schematic diagram of the cross-sectional structure of the main positioning ring.

[0039] Figure 5 A schematic diagram of the main positioning ring.

[0040] Figure 6 This is a schematic diagram of the drive component.

[0041] In the diagram: 1. Base; 2. Adjustment mechanism; 201. Support seat; 3. Fixture tooling; 4. Axis positioning mechanism; 5. Welding robot; 6. First adjustment assembly; 601. Electric slide table; 602. Support plate; 7. Second adjustment assembly; 701. Guide rod; 702. Drive screw; 703. Drive motor; 704. Fixed seat; 8. Main positioning assembly; 801. Mounting seat; 802. Main positioning ring; 803. Insertion hole; 804. Second 805. Rotating ear; 806. Movable groove; 807. Threaded hole; 9. Secondary positioning assembly; 901. Secondary positioning ring; 902. Locking block; 903. First rotating ear; 10. Linkage assembly; 1001. Rocker; 1002. Connecting rod; 1003. Return spring; 11. Locking component; 1101. Drive handle; 1102. Locking block; 12. Drive component; 1201. Anti-rotation rod; 1202. Adjusting rod; 1203. Anti-detachment block; 13. Adjusting bolt. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0044] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0045] For examples, please refer to Figure 1 - Figure 6 A seat frame tube fitting welding device and method thereof, including a base 1, and an adjustment mechanism 2 is provided on the base 1. A fixture 3 and an axis positioning mechanism 4 are fixedly installed on the adjustment mechanism 2. The axis positioning mechanism 4 is located at the joint welding point of the workpiece on the fixture 3. A welding robot 5 is provided on one side of the base 1. The welding robot 5 is used to weld the joint of the workpiece on the fixture 3.

[0046] The adjustment mechanism 2 includes a support base 201 disposed on the base 1, a first adjustment component 6 disposed on one side of the support base 201, and a second adjustment component 7 disposed on the first adjustment component 6, and the fixture 3 is fixedly connected to the second adjustment component 7.

[0047] The axial positioning mechanism 4 includes a main positioning component 8 disposed on the support base 201, a secondary positioning component 9 rotatably mounted on the main positioning component 8, and a linkage component 10 disposed on the main positioning component 8 for driving the secondary positioning component 9.

[0048] A shielding plate is provided on one side of the base 1. There are two sets of base 1, which are symmetrically distributed at both ends of one side of the shielding plate. The welding robot 5 is located at the end of the base 1 away from the shielding plate and between the two sets of base 1, so that the welding robot 5 can perform joint welding on the workpieces on the fixtures 3 on the two sets of base 1.

[0049] Specifically, the fixture 3 is customized according to the model of the seat frame tubing. The fixture 3 is fixedly installed on the second adjustment component 7 by bolts, so that the joint position of the workpiece held on the fixture 3 corresponds to the welding path of the welding robot 5. The welding robot 5 is initially set with a fixed welding path. Therefore, after the fixture 3 is customized and replaced according to the model of the seat frame tubing, the joint position of the workpiece on the fixture 3 can be adjusted by the first adjustment component 6 and the second adjustment component 7 to correspond to the welding path of the welding robot 5. This eliminates the trouble of re-editing the welding path program of the welding robot 5, thus making the use of the equipment more accessible. When replacing the fixture 3, there is no need for technical personnel who can edit the welding robot 5, thereby reducing the company's labor costs.

[0050] Furthermore, the axial positioning mechanism 4 is fixedly installed on the support base 201 by bolts. The main positioning component 8 and the auxiliary positioning component 9 are rotatably connected. When the workpiece is not placed on the fixture 3, the auxiliary positioning component 9 is rotated open with the main positioning component 8 under the action of the linkage component 10. This allows the workpiece to be placed into the main positioning component 8 at the same time when it is placed on the fixture 3. When the workpiece is placed into the main positioning component 8, it will push the linkage component 10, thereby causing the auxiliary positioning component 9 to rotate and close into a ring with the main positioning component 8. This limits the position of the pipe at the workpiece joint. There are two sets of main positioning components 8 and auxiliary positioning components 9, corresponding to the two ends of the workpiece joint respectively. The two sets of main positioning components 8 and auxiliary positioning components 9, which are closed in a ring, respectively position the two ends of the workpiece joint, so that the two ends of the workpiece joint have the same axis, thereby improving the quality of the joint welding.

[0051] It should be noted that there is a certain gap between the two sets of main positioning components 8 and secondary positioning components 9. The gap is the joint position of the workpiece, which is used by the welding head of the welding robot 5 to weld the joint of the workpiece.

[0052] Preferably, when the fixture 3 needs to be replaced due to changes in the workpiece model, the axial positioning mechanism 4 can serve as a fixed point marker for the new workpiece joint. After the fixture 3 is replaced, the position of the new workpiece joint changes, and it needs to be adjusted after being fixedly installed on the adjustment mechanism 2. This ensures that the welding path of the joint corresponds to the welding path of the welding robot 5. This is achieved through the adjustment of the first adjustment component 6 and the second adjustment component 7 until the workpiece joint on the fixture 3 is located in the gap between the two sets of main positioning components 8 and secondary positioning components 9, and is clamped coaxially. The main positioning component 8 includes a mounting base 801 fixedly installed on the support base 201, a main positioning ring 802 disposed on the mounting base 801, and a locking element 11 disposed on the outer wall of the main positioning ring 802 at the end away from the mounting base 801.

[0053] The main positioning ring 802 is arranged in two sets symmetrically about the upper and lower ends of the mounting base 801.

[0054] The secondary positioning assembly 9 includes a secondary positioning ring 901 rotatably mounted on the main positioning ring 802, a locking block 902 disposed at one end of the outer wall of the secondary positioning ring 901 away from the mounting base 801, and a first rotating ear 903 disposed on the circumferential side wall of the secondary positioning ring 901 near the rotatably mounted end.

[0055] Locking block 902 and locking member 11 are locked and matched, and first rotating ear 903 and linkage assembly 10 are rotatably connected.

[0056] The locking component 11 includes a drive handle 1101 rotatably mounted on the circumferential side wall of the main positioning ring 802, and a locking block 1102 disposed on the drive handle 1101 and matched with the locking block 902.

[0057] The secondary positioning ring 901 corresponds to the main positioning ring 802 on the mounting base 801, and is also provided in two sets. Together with the main positioning ring 802, they form two annular positioning rings to position the axis at both ends of the workpiece joint.

[0058] Specifically, after the workpiece is placed on the fixture 3, it fits against the two sets of main positioning rings 802. Then, under the action of the linkage component 10, the two sets of auxiliary positioning rings 901 are driven to rotate and close. Since the clamping force of the clamp on the fixture 3 is relatively small when it is transmitted to the workpiece closing position, the workpiece closing tube cannot make the linkage component 10 close in place when it comes into contact with the linkage component 10. In fact, the axis may even deviate due to the action of the linkage component 10.

[0059] At this time, the locking member 11 will be rotated so that the locking member 11 and the locking block 902 match, thereby making the main positioning ring 802 and the secondary positioning ring 901 form a closed ring, thus centering the axis of both ends of the workpiece joint and improving the welding quality of the welding robot 5.

[0060] A insertion hole 803 is provided at the center of the inner wall of the main positioning ring 802, and a second rotating lug 804 is provided on the circumferential side wall of the main positioning ring 802.

[0061] The linkage assembly 10 includes a drive member 12 movably disposed in the insertion hole 803, a rocker plate 1001 rotatably mounted on the second rotating ear 804, and a connecting rod 1002 rotatably mounted on the end of the rocker plate 1001 away from the drive member 12. The end of the connecting rod 1002 away from the rocker plate 1001 is rotatably connected to the first rotating ear 903 on the secondary positioning ring 901.

[0062] The mounting base 801 has a movable slot 805, and the connecting rod 1002 movably passes through the movable slot 805;

[0063] A return spring 1003 is sleeved on the connecting rod 1002, and the two ends of the return spring 1003 abut against the outer wall of the mounting base 801 and the rotating end of the connecting rod 1002 near the rocker plate 1001, respectively.

[0064] In the initial state, under the action of the return spring 1003, one end of the rocker 1001 is pushed away from the mounting base 801. Under the pull of the connecting rod 1002, the secondary positioning ring 901 rotates and is in an open state with the main positioning ring 802. One end of the rocker 1001 is away from the mounting base 801, so that its other end pushes the drive member 12 closer to the axis position of the main positioning ring 802.

[0065] Specifically, when the workpiece is placed on the fixture 3, the two ends of the workpiece joint abut against the driving components 12 on the two sets of main positioning rings 802, causing the rocker 1001 to rotate. This causes the end of the rocker 1001 away from the driving component 12 to push the connecting rod 1002, thereby causing the secondary positioning ring 901 to rotate and close with the main positioning ring 802, thus positioning the corresponding axes at both ends of the workpiece joint and improving the welding quality.

[0066] Both the main positioning ring 802 and the auxiliary positioning ring 901 are provided with threaded holes 806, and an adjusting bolt 13 is installed in the internal thread of the threaded hole 806.

[0067] The driving component 12 includes an anti-rotation rod 1201 movably disposed within the insertion hole 803, an adjusting rod 1202 threadedly mounted to one end of the anti-rotation rod 1201, and an anti-detachment block 1203 disposed at the end of the adjusting rod 1202 away from the anti-rotation rod 1201. Adjusting bolts 13 are arranged in a ring array on the inner walls of the main positioning ring 802 and the secondary positioning ring 901, and the adjusting bolts 13 penetrate the side walls of the main positioning ring 802 and the secondary positioning ring 901. The ring array of adjusting bolts 13 allows for the formation of rings of different sizes in the main positioning ring 802 and the secondary positioning ring 901 to accommodate the positioning of pipe fittings of different diameters.

[0068] Specifically, when the diameter of the steel pipe changes with the model of the workpiece, the steel pipe of the workpiece is first placed between the main positioning ring 802 and the secondary positioning ring 901, and then gradually adjusted to make the steel pipe centered. This ensures that the axial alignment of the two ends of the joint of the new workpiece pipe can still be achieved when the joint is welded, thereby improving the welding quality.

[0069] Furthermore, if the diameter of the adjusting bolt 13 of the annular array becomes smaller after adjustment, the distance by which it pushes the drive member 12 to move when the pipe is inserted will not be able to drive the secondary positioning ring 901 to close through the rocker arm 1001 and the connecting rod 1002. In this case, the function of the linkage component 10 will be rendered ineffective. Therefore, after the adjusting bolt 13 is adjusted according to the change in the diameter of the workpiece steel pipe, the length of the drive member 12 also needs to be adjusted. The anti-detachment block 1203 on the adjusting rod 1202 is a polygonal block, which can be threaded by a wrench. This allows the drive member 12 to be pushed into place when the new workpiece steel pipe is inserted into the main positioning ring 802, thereby causing the secondary positioning ring 901 to rotate and close with the main positioning ring 802. In addition, the anti-detachment block 1203 also prevents the drive member 12 from falling off.

[0070] It should be noted that an annular clearance hole is provided on the rocker 1001 near the adjusting bolt 13 to facilitate the adjustment of the adjusting bolt 13. The first adjusting assembly 6 includes an electric slide 601 disposed on one side of the support base 201, and a support plate 602 disposed on the electric slide 601.

[0071] The electric slide table 601 is for horizontal movement adjustment. There are two sets of electric slide tables 601, which are fixedly installed at the upper and lower ends of one side of the support base 201. The support plates 602 are welded to the upper and lower sides of the two sets of electric slide tables 601 respectively. That is, the support plate 602 is welded to the upper side of the electric slide table 601, and the support plate 602 is welded to the lower side of the electric slide table 601. The second adjustment component 7 is located in the gap between the two support plates 602. The second adjustment component 7 is for vertical adjustment.

[0072] The second adjustment component 7 includes a guide rod 701 and a drive screw 702 disposed on the support plate 602, a drive motor 703 disposed on the top of the support plate 602 and fixedly connected to one end of the drive screw 702, and a fixed seat 704 slidably mounted on the guide rod 701.

[0073] The fixed base 704 and the drive screw 702 are connected by a threaded drive.

[0074] Two guide rods 701 are provided, which are welded to both ends of the support plate 602 respectively. There is only one drive screw 702, which is located between the two guide rods 701. The lower end of the drive screw 702 is rotatably connected to the lower support plate 602, and the top end of the drive screw 702 passes through the upper support plate 602 and is fixedly connected to the output shaft of the drive motor 703. The drive motor 703 is fixedly connected to the support plate 602. The guide rods 701 and the fixed seat 704 are movably plugged together. The drive screw 702 and the fixed seat 704 are connected by a screw. The fixture 3 is installed on the fixed seat 704 by fixing bolts.

[0075] Specifically, during adjustment, the horizontal position is adjusted by the electric slide table 601, and the vertical position is adjusted by the drive screw 702 driven by the drive motor 703, thereby adjusting the position of the new workpiece on the fixture 3 until the position of the new workpiece is aligned with the position of the axial positioning mechanism 4.

[0076] It should be noted that although the adjustment can save the trouble of rewriting the welding robot 5 path programming, it is only applicable to the replacement of the fixture 3 for pipe fittings of the same diameter. When the diameter of the pipe fitting changes, it is still necessary to rewrite the welding path of the welding robot 5. However, when rewriting, it is only necessary to change the diameter of the path, which will save a lot of time compared to repositioning and calibration.

[0077] S1. Select and fix the appropriate fixture 3 according to the pipe fitting model to ensure that it corresponds to the welding path.

[0078] S2. Start the adjustment mechanism 2 to precisely adjust the position of the fixture 3 and ensure that the pipe fitting end corresponds to the axial positioning mechanism 4.

[0079] S3. Place the pipe fitting, and the linkage component 10 drives the secondary positioning ring 901 to close, positioning the pipe fitting shaft.

[0080] S4. Start welding robot 5 and perform welding according to the preset path.

[0081] S5. After welding is completed, remove the pipe fittings and check the welding quality.

[0082] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for the joint of a seat frame tube, characterized in that: Includes a base (1), and an adjustment mechanism (2) is provided on the base (1). A fixture (3) and a shaft positioning mechanism (4) are fixedly installed on the adjustment mechanism (2). The shaft positioning mechanism (4) is located at the joint welding point of the workpiece on the fixture (3). A welding robot (5) is provided on one side of the base (1). The welding robot (5) is used to weld the joint of the workpiece on the fixture (3). The adjustment mechanism (2) includes a support base (201) disposed on the base (1), a first adjustment component (6) disposed on one side of the support base (201), and a second adjustment component (7) disposed on the first adjustment component (6), and the fixture (3) is fixedly connected to the second adjustment component (7); The axial positioning mechanism (4) includes a main positioning component (8) disposed on the support base (201), a secondary positioning component (9) rotatably mounted on the main positioning component (8), and a linkage component (10) disposed on the main positioning component (8) for driving the secondary positioning component (9). The main positioning component (8) includes a mounting base (801) fixedly installed on the support base (201), a main positioning ring (802) disposed on the mounting base (801), and a locking member (11) disposed on the outer wall of the main positioning ring (802) away from the mounting base (801). The main positioning ring (802) is symmetrically arranged in two sets about the upper and lower ends of the mounting base (801); The sub-positioning component (9) includes a sub-positioning ring (901) rotatably mounted on the main positioning ring (802), a locking block (902) disposed on the outer wall of the sub-positioning ring (901) away from the mounting base (801), and a first rotating ear (903) disposed on the circumferential side wall of the sub-positioning ring (901) near the rotatably mounted end. The locking block (902) and the locking member (11) are locked together, and the first rotating ear (903) and the linkage assembly (10) are rotatably connected; The main positioning ring (802) has a insertion hole (803) at the center of its inner wall, and the main positioning ring (802) has a second rotating lug (804) on its circumferential side wall. The linkage component (10) includes a drive member (12) movably disposed in the insertion hole (803), a rocker plate (1001) rotatably mounted on the second rotating ear (804), and a connecting rod (1002) rotatably mounted on the end of the rocker plate (1001) away from the drive member (12). The end of the connecting rod (1002) away from the rocker plate (1001) is rotatably connected to the first rotating ear (903) on the sub-positioning ring (901). The mounting base (801) has a movable groove (805), and the connecting rod (1002) moves through the movable groove (805). A return spring (1003) is sleeved on the connecting rod (1002), and the two ends of the return spring (1003) respectively abut against the outer wall of the mounting base (801) and the rotating end of the connecting rod (1002) near the rocker (1001); Both the main positioning ring (802) and the secondary positioning ring (901) are provided with threaded holes (806), and an adjusting bolt (13) is installed in the threaded hole (806). The drive component (12) includes an anti-rotation rod (1201) movably disposed in the insertion hole (803), an adjustment rod (1202) threadedly installed at one end of the anti-rotation rod (1201), and an anti-detachment block (1203) disposed at the end of the adjustment rod (1202) away from the anti-rotation rod (1201).

2. The seat frame tube fitting welding device according to claim 1, characterized in that: The locking component (11) includes a drive handle (1101) rotatably mounted on the circumferential sidewall of the main positioning ring (802), and a locking block (1102) disposed on the drive handle (1101) and matched with the locking block (902).

3. The seat frame tube joint welding device according to claim 2, characterized in that: The first adjustment component (6) includes an electric slide (601) disposed on one side of the support base (201) and a support plate (602) disposed on the electric slide (601).

4. The seat frame tube fitting welding device according to claim 3, characterized in that: The second adjustment component (7) includes a guide rod (701) and a drive screw (702) disposed on the support plate (602), a drive motor (703) disposed on the top of the support plate (602) and fixedly connected to one end of the drive screw (702), and a fixed seat (704) slidably mounted on the guide rod (701). The fixed base (704) and the drive screw (702) are threadedly connected.

5. A method for welding the joint of a seat frame tube, characterized in that: The seat frame tube joint welding device according to any one of claims 1-4, and, S1. Select the appropriate fixture (3) according to the pipe fitting model and fix it to ensure that it corresponds to the welding path; S2. Start the adjustment mechanism (2) and precisely adjust the position of the fixture (3) to ensure that the pipe fitting end corresponds to the axial positioning mechanism (4). S3. Place the pipe fitting, and the linkage component (10) drives the secondary positioning ring (901) to close, positioning the pipe fitting shaft; S4. Start the welding robot (5) and perform welding according to the preset path; S5. After welding is completed, remove the pipe fittings and check the welding quality.

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