Divided-point multi-stage type automatic welding mechanism

Abstract

The invention discloses a point-division multi-stage type automatic welding mechanism, and relates to the field of welding, the point-division multi-stage type automatic welding mechanism comprises a mounting frame, the center of the inner side of the mounting frame is rotatably connected with a screw rod, the outer surface of the screw rod is in threaded connection with a lifting block, one side of the lifting block is fixedly connected with a fixing frame, and the bottom of the fixing frame is fixedly connected with a lifting frame; a transmission mechanism is installed on the inner side of the fixing frame. The linkage of the movable block and the shear type frame is driven by the threaded rod, so that the welding angles of the multiple welding guns can be flexibly adjusted to meet the requirements of different workpieces, the synchronous movement of the driving rod and the second worm ensures the dynamic adjustment of the angles of the welding guns, the welding efficiency and precision are improved, meanwhile, a limiting mechanism in the system prevents excessive movement, and the welding quality is improved. Stability and reliability of equipment are guaranteed, workpieces of various sizes, shapes and materials can be rapidly processed, production efficiency and consistency of welding quality are remarkably improved, and human intervention and operation errors are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a point-by-point multi-level automatic welding mechanism. Background Art

[0002] Welding, also known as fusion, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. There are many sources of energy for modern welding, including gas flame, arc, laser, electron beam, friction and ultrasonic waves. In addition to being used in factories, welding can also be performed in a variety of environments, such as outdoors, underwater and in space.

[0003] For example, the "A multi-stage automatic welding mechanism with divided points" with publication number CN110788549A includes an adjusting bolt, a rotating worm, a positioning pin, a first placement seat, a placement plate, a damping tension spring, a left movable seat, a right movable seat and an ejection spring. The left and right end surfaces of the sliding seat are symmetrically installed with adjusting bolts, a rotating worm is installed inside the sliding seat, the right movable seat is meshed with the right side of the annular side surface of the rotating worm, and the left movable seat is meshed with the left side of the annular side surface of the rotating worm. The first placement seat is welded on the upper end surface of the right movable seat, the placement plate is attached to the upper end surface of the first placement seat, a positioning pin is inserted on the right side of the placement plate, an ejection spring is installed in the middle position of the lower end surface of the placement plate, and a damping tension spring is installed on the left side of the lower end surface of the placement plate.

[0004] However, in the prior art, when welding a group of multiple workpieces, since the sizes of each group of workpieces are different and the spacing distances between the workpieces are also different, this inconsistency in size and spacing will result in the inability to ensure that each workpiece can be accurately aligned with the welding position during each welding process. This will not only affect the welding accuracy, but also lead to welding deviations, poor weld quality, and even deformation of the workpieces. Especially in mass production, such problems will significantly reduce welding efficiency and increase scrap rate, thereby affecting production costs and production cycles. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-level automatic welding mechanism with points to solve the problem that the spacing distances between workpieces mentioned in the above background technology are also different. Such inconsistency in size and spacing will lead to the problem that during the welding process, it is impossible to ensure that each workpiece can be accurately aligned with the welding position every time welding is performed.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a point-by-point multi-stage automatic welding mechanism, comprising a mounting frame, a screw rod is rotatably connected to the center of the inner side of the mounting frame, a lifting block is threadedly connected to the outer surface of the screw rod, a fixed frame is fixedly connected to one side of the lifting block, a lifting frame is fixedly connected to the bottom of the fixed frame, a transmission mechanism is installed on the inner side of the fixed frame, and a grading mechanism is installed on the top of the lifting frame; The grading mechanism includes a threaded rod, both ends of the threaded rod are rotatably connected to the second supporting frame, a driving bar is rotatably connected between the two second supporting frames, a movable block is slidably connected to the outer surface of the driving bar, the top of the movable block is fixedly connected to the mounting block, the inner side of the mounting block is rotatably connected to the second worm gear, the second worm gear is meshingly connected below the second worm gear, a sliding groove is provided on the inner side of the second worm gear, the second worm gear is slidably connected to the driving rod, the outer surface of the second worm gear is fixedly connected to the driving bar, the driving bar is slidably connected to the sliding groove, a scissors-type frame is arranged below the mounting block, a center rod is fixedly connected to the middle of the scissors frame, and one end of the scissors frame is fixedly connected to the second fixed rod.

[0007] Preferably, a sliding rod is fixedly connected between the two second support frames, the sliding rod is slidably connected to the movable block, the bottom of the movable block is fixedly connected to the center rod, and one end of the second worm gear is fixedly connected to a transmission rod.

[0008] Preferably, one end of the transmission rod passes through the mounting block, and one end of the transmission rod is fixedly connected to a welding gun.

[0009] Preferably, the bottom of the second support frame is fixedly connected to the top of the lifting frame, one of the movable blocks is threadedly connected to the threaded rod, and the other movable blocks are slidably connected to the threaded rod.

[0010] Preferably, the transmission mechanism comprises a driving bevel gear and a first worm, the driving bevel gear is meshingly connected with driven bevel gears on both sides, one end of the driven bevel gear is fixedly connected to a connecting rod, and one end of the connecting rod is fixedly connected to the threaded rod.

[0011] Preferably, the top of the first worm is meshingly connected with a first worm wheel, and both sides of the first worm wheel are fixedly connected with first fixing rods.

[0012] Preferably, one end of the first worm is rotatably connected to a first support frame, the bottom of the first support frame is fixedly connected to a fixing frame, the inner wall of the fixing frame is fixedly connected to a second drive motor, and the output end of the second drive motor is fixedly connected to the first worm.

[0013] Preferably, a first drive motor is installed on the top of the fixing frame, and an output end of the first drive motor is fixedly connected to the active bevel gear.

[0014] Preferably, one end of the driving rod passes through the second supporting frame, and one end of the driving rod is fixedly connected to two ends of the first fixing rod.

[0015] Preferably, a slide rail is fixedly connected to one side of the mounting frame, two guide blocks are slidably connected to the outer surface of the slide rail, one end of the guide block is fixedly connected to the fixed frame, a servo motor is installed in the center of the top of the mounting frame, and the output end of the servo motor is fixedly connected to the screw rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the threaded rod drives the movable block and the scissor frame to link, so that multiple welding guns can flexibly adjust the welding angle to meet the needs of different workpieces. The synchronous movement of the driving rod and the second worm ensures the dynamic adjustment of the welding gun angle and improves the welding efficiency and accuracy. At the same time, the limit mechanism in the system prevents excessive movement, ensures the stability and reliability of the equipment, can quickly process workpieces of various sizes, shapes and materials, significantly improves production efficiency and consistency of welding quality, and reduces human intervention and operating errors.

[0017] 2. In the present invention, when the multiple movable blocks are separated, they slide under the guidance of the slide rod and combine with the drive bar at the same time, so that the slide groove and the drive rod slide relative to each other. During this process, the second worm and the mounting block slide synchronously on the surface of the drive rod and adjust as it rotates. This synchronization mechanism not only ensures that the welding angles of all welding guns can be automatically adjusted, but also ensures the coordinated cooperation of all components during the welding process. When the drive rod rotates, the slide groove combines with the drive bar to generate a force to ensure that the second worm and the mounting block move along the correct trajectory, thereby realizing synchronous adjustment of the angle of the welding gun. This synergistic effect provides great flexibility and accuracy for multi-workpiece welding, enables each welding gun to automatically adjust according to the position of the workpiece, ensures the consistency of welding quality, reduces human intervention, and improves welding efficiency and accuracy.

[0018] 3. In the present invention, during the welding process, the first drive motor drives the two driven bevel gears to rotate simultaneously through the active bevel gear, and then drives the connecting rod and the threaded rod to rotate synchronously. This linkage mechanism enables multiple movable blocks to move simultaneously, quickly adjust the position of the workpiece, and ensure precise positioning for efficient welding operations. At the same time, the second drive motor drives the first worm to rotate, and through the engagement with the first worm gear, further drives the first fixed rod to rotate, thereby applying a force to the drive rod to accurately adjust the angle of the welding gun. This design can meet the welding requirements of different workpieces, ensure dynamic adjustment of the welding angle, and make the welding process more precise. In addition, the servo motor drives the external lifting block to move by driving the lead screw, thereby driving the fixed frame to lift and lower, and flexibly adjust the height of the welding gun to adapt to the welding of multiple workpieces. The sliding of the guide block along the slide rail ensures that the fixed frame remains stable during the lifting process, avoids displacement or skew, and further improves the stability and accuracy of the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a point-by-point multi-level automatic welding mechanism of the present invention; Figure 2 It is a schematic diagram of the split structure of a point-by-point multi-stage automatic welding mechanism of the present invention; Figure 3 It is a structural schematic diagram of a grading mechanism of a point-by-point multi-level automatic welding mechanism of the present invention; Figure 4 It is a schematic diagram of the split structure of a grading mechanism of a point-by-point multi-level automatic welding mechanism of the present invention; Figure 5 It is a structural schematic diagram of a scissor-type frame of a point-by-point multi-stage automatic welding mechanism of the present invention; Figure 6 It is a structural schematic diagram of a driving rod of a point-by-point multi-stage automatic welding mechanism of the present invention; Figure 7 The present invention is a schematic structural diagram of a transmission mechanism of a point-by-point multi-stage automatic welding mechanism.

[0020] In the figure: 1, mounting frame; 11, slide rail; 12, lead screw; 13, guide block; 14, lifting block; 2, servo motor; 3, lifting frame; 4, fixed frame; 5, transmission mechanism; 51, first drive motor; 52, active bevel gear; 53, driven bevel gear; 54, connecting rod; 55, first fixed rod; 56, first worm gear; 57, first worm; 58, second drive motor; 59, first support frame; 6, welding gun; 7, grading mechanism; 71, slide rod; 72, threaded rod; 73, drive rod; 731, drive bar; 74, mounting block; 741, movable block; 75, scissor frame; 751, center rod; 752, second fixed rod; 76, second worm; 761, slide groove; 77, second worm gear; 771, transmission rod; 78, second support frame. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Reference Figure 1 - Figure 6 As shown: a point-by-point multi-stage automatic welding mechanism, including a mounting frame 1, a screw rod 12 is rotatably connected to the center of the inner side of the mounting frame 1, a lifting block 14 is threadedly connected to the outer surface of the screw rod 12, a fixed frame 4 is fixedly connected to one side of the lifting block 14, a lifting frame 3 is fixedly connected to the bottom of the fixed frame 4, a transmission mechanism 5 is installed on the inner side of the fixed frame 4, and a grading mechanism 7 is installed on the top of the lifting frame 3; The grading mechanism 7 includes a threaded rod 72, both ends of which are rotatably connected to second support frames 78, a driving bar 731 is rotatably connected between the two second support frames 78, a movable block 741 is slidably connected to the outer surface of the driving bar 731, a mounting block 74 is fixedly connected to the top of the movable block 741, a second worm gear 77 is rotatably connected to the inner side of the mounting block 74, a second worm 76 is meshingly connected to the lower side of the second worm gear 77, a sliding groove 761 is provided on the inner side of the second worm 76, the second worm 76 is slidably connected to the driving rod 73, a driving bar 731 is fixedly connected to the outer surface of the second worm 76, the driving bar 731 is slidably connected to the sliding groove 761, a scissor frame 75 is arranged below the mounting block 74, a center rod 751 is fixedly connected to the middle part of the scissor frame 75, and a second fixed rod 752 is fixedly connected to one end of the scissor frame 75.

[0023] In this embodiment, when welding is performed, a movable block 741 can be driven to perform reciprocating motion by the drive of the threaded rod 72. In this process, the movable block 741 will further drive the scissor frame 75 to expand or contract through linkage with other mechanical components. When the scissor frame 75 is unfolded, multiple joints will move accordingly. In particular, due to the presence of the second fixed rod 752, it plays a role in limiting the range of motion of the scissor frame 75 to prevent it from exceeding the preset range. As the scissor frame 75 is unfolded, multiple movable blocks 741 will move synchronously, so that the entire device is in a coordinated working state. As the movable blocks 741 are unfolded, they will drive the connected mounting blocks 74 to move synchronously and adjust their positions so as to prepare for welding according to the specific needs of each group of workpieces. This design ensures that when processing multiple workpieces, the position of the mounting block 74 can be flexibly adjusted according to the spacing between each workpiece, thereby ensuring the accuracy and efficiency of the welding operation.

[0024] During the entire adjustment process, when the driving rod 73 rotates, it can generate sufficient torque through the linkage with the driving bar 731, and then apply a force to the connected second worm 76 through the slide groove 761. As the second worm 76 rotates, it can drive the second worm wheel 77 meshing with it to rotate synchronously. This movement process allows multiple key components to be coordinated. During welding, due to the dual drive of the driving rod 73 and the driving bar 731, the transmission rod 771 in the transmission system will also rotate, thereby changing the welding angle of the welding tool - the welding gun 6. The adjustment of this angle is dynamic and precise, and can be flexibly adjusted according to the needs of different workpieces.

[0025] In addition, the synergy of the drive rod 73 and the second worm 76 enables the entire system to synchronously adjust the angles of multiple welding guns 6, which not only improves the efficiency of welding, but also ensures that each welding gun 6 can perform precise welding angle control when welding multiple workpieces. This synchronous adjustment mechanism greatly simplifies the difficulty of operation during the welding process, reduces the need for manual intervention, and can effectively shorten the welding time and improve production efficiency. In actual operation, it can adapt to workpieces of different sizes, shapes and materials, especially on automated production lines, and can perform continuous and efficient welding operations on multiple workpieces. Through precise control of key components such as the threaded rod 72, the drive rod 73, and the second worm 76, the system can complete complex welding tasks in a short time, greatly improving production efficiency. At the same time, precise control of the welding process can also ensure the consistency of welding quality and avoid product quality problems caused by human errors.

[0026] Embodiment 2: Figure 2 , Figure 3 and Figure 5 As shown, a slide bar 71 is fixedly connected between the two second support frames 78, the slide bar 71 is slidably connected to the movable block 741, the bottom of the movable block 741 is fixedly connected to the center rod 751, and one end of the second worm gear 77 is fixedly connected to a transmission rod 771. One end of the transmission rod 771 passes through the mounting block 74, and one end of the transmission rod 771 is fixedly connected to the welding gun 6. The bottom of the second support frame 78 is fixedly connected to the top of the lifting frame 3, one of the movable blocks 741 is threadedly connected to the threaded rod 72, and the other movable blocks 741 are slidably connected to the threaded rod 72.

[0027] In this embodiment, when the plurality of movable blocks 741 are separated together, the movable blocks 741 can not only slide under the guidance of the slide bar 71, but also slide on the surface of the driving rod 73 through the slide groove 761. The combination of the slide groove 761 and the driving bar 731 makes the whole system more flexible and accurate. The second worm 76 and the mounting block 74 can not only slide on the surface of the driving rod 73, but also receive the force from the driving rod 73 when the driving rod 73 rotates. This design ensures that when the driving rod 73 rotates, all related parts can be adjusted synchronously.

[0028] Through this synchronous adjustment, the system can automatically adjust the welding angle of the welding gun 6. When the driving rod 73 rotates, the chute 761 cooperates with the driving bar 731 to ensure that the second worm 76 and the mounting block 74 slide on the correct track, and adjust the angles of multiple welding guns 6 at the same time. This synergy greatly improves the accuracy and efficiency of the welding operation, so that in multi-workpiece welding, each welding gun 6 can achieve synchronous angle adjustment according to the specific workpiece position and welding requirements, ensuring the consistency of welding quality and improving production efficiency.

[0029] Embodiment 3: According to Figure 1 and Figure 7 As shown, the transmission mechanism 5 includes a driving bevel gear 52 and a first worm 57. Both sides of the driving bevel gear 52 are meshedly connected with the driven bevel gear 53. One end of the driven bevel gear 53 is fixedly connected with a connecting rod 54, and one end of the connecting rod 54 is fixedly connected with the threaded rod 72. The top of the first worm 57 is meshedly connected with the first worm wheel 56, and both sides of the first worm wheel 56 are fixedly connected with the first fixed rod 55. One end of the first worm 57 is rotatably connected with the first support frame 59, the bottom of the first support frame 59 is fixedly connected with the fixed frame 4, the inner wall of the fixed frame 4 is fixedly connected with the second drive motor 58, and the output end of the second drive motor 58 is fixedly connected with the first worm 57. The first drive motor 51 is installed on the top of the fixed frame 4, and the output end of the first drive motor 51 is fixedly connected with the driving bevel gear 52. One end of the drive rod 73 passes through the second support frame 78, and one end of the drive rod 73 is fixedly connected with both ends of the first fixed rod 55. A slide rail 11 is fixedly connected to one side of the mounting frame 1, and two guide blocks 13 are slidably connected to the outer surface of the slide rail 11. One end of the guide block 13 is fixedly connected to the fixed frame 4. A servo motor 2 is installed in the center of the top of the mounting frame 1, and the output end of the servo motor 2 is fixedly connected to the screw rod 12.

[0030] In this embodiment, during the welding process, the driving of the first driving motor 51 can drive the active bevel gear 52 to rotate together, and as the active bevel gear 52 rotates, it can drive the two driven bevel gears 53 to rotate simultaneously. As the driven bevel gear 53 is driven, the connecting rod 54 also rotates, thereby driving the threaded rod 72 to rotate. This series of actions will simultaneously drive the multiple movable blocks 741 to move together, so that the positions of multiple workpieces can be quickly adjusted to ensure the precise positioning of each group of workpieces, so as to facilitate the subsequent welding operation.

[0031] Driven by the second drive motor 58, the first worm 57 starts to rotate, and the first worm 57 applies a force to the first worm wheel 56. As the first worm wheel 56 rotates, it drives the first fixed rod 55 to rotate together. When the first fixed rod 55 rotates, it applies a force to the drive rod 73, thereby adjusting the angle of the welding gun 6, making welding more precise and meeting the welding requirements of different workpieces.

[0032] In the actual welding process, the servo motor 2 drives the screw rod 12 to rotate, driving the lifting block 14 on the outer surface of the screw rod 12, thereby lifting the fixed frame 4. This adjustment can change the height of the welding gun 6 to meet the requirements of welding multiple workpieces at the same time. In addition, when the guide block 13 slides on the outer surface of the slide rail 11, it can ensure that the fixed frame 4 remains stable during the lifting process, avoids skewing or deviation, and ensures the accuracy and stability of the welding operation.

[0033] The use method and working principle of the device: During the welding process, the driving of the threaded rod 72 can drive the movable block 741 to move, and then drive the scissor frame 75 to expand. As the scissor frame 75 moves, the second fixed rod 752 plays a limiting role. The expansion of the scissor frame 75 will drive multiple movable blocks 741, and the expansion of the movable block 741 will further drive the installation block 74 to move synchronously, so that the positions of multiple installation blocks 74 can be adjusted according to the workpieces to be welded, ensuring that the interval between each group of workpieces is reasonable, which is convenient for precise welding. During the adjustment process, the driving rod 73 applies a force to the slide groove 761 through the driving bar 731, driving the second worm 76 to rotate, and then driving the second worm gear 77 to achieve angle adjustment. During welding, under the coordinated action of the driving rod 73 and the driving bar 731, the transmission rod 771 can synchronously adjust the welding angles of multiple welding guns 6, thereby improving the welding efficiency.

[0034] When the multiple movable blocks 741 are separated at the same time, the movable blocks 741 will not only slide under the guidance of the slide bar 71, but also slide on the surface of the driving rod 73 through the slide groove 761. Through the cooperation of the slide groove 761 and the driving bar 731, the second worm 76 and the mounting block 74 can slide on the surface of the driving rod 73, and at the same time, they are subjected to a force when the driving rod 73 rotates, thereby synchronously adjusting the angle of the welding gun 6.

[0035] During welding, the first drive motor 51 drives the active bevel gear 52 to rotate, and the active bevel gear 52 drives the two driven bevel gears 53 to rotate, thereby driving the connecting rod 54 and the threaded rod 72 to rotate synchronously, so that multiple movable blocks 741 are adjusted at the same time. The second drive motor 58 drives the first worm 57, which drives the first fixed rod 55 to rotate through the first worm gear 56, thereby driving the drive rod 73 to adjust the angle of the welding gun 6. During welding, the servo motor 2 drives the screw rod 12 to make the external lifting block 14 drive the fixed frame 4 to rise and fall, thereby adjusting the height of the welding gun 6 to adapt to the welding of multiple workpieces. The guide block 13 slides on the slide rail 11 to ensure the stability of the fixed frame 4 during the lifting process, avoid skewing and offset, and ensure welding accuracy.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A point-by-point multi-stage automatic welding mechanism, comprising a mounting frame (1), a screw rod (12) being rotatably connected to the center of the inner side of the mounting frame (1), a lifting block (14) being threadedly connected to the outer surface of the screw rod (12), a fixing frame (4) being fixedly connected to one side of the lifting block (14), and a lifting frame (3) being fixedly connected to the bottom of the fixing frame (4), characterized in that: A transmission mechanism (5) is installed inside the fixed frame (4), and a grading mechanism (7) is installed on the top of the lifting frame (3); The grading mechanism (7) comprises a threaded rod (72), both ends of the threaded rod (72) are rotatably connected to second support frames (78), a driving bar (731) is rotatably connected between the two second support frames (78), a movable block (741) is slidably connected to the outer surface of the driving bar (731), a mounting block (74) is fixedly connected to the top of the movable block (741), a second worm gear (77) is rotatably connected to the inner side of the mounting block (74), and a second worm gear (77) is meshingly connected to the lower side of the second worm gear (77). 76), a slide groove (761) is provided on the inner side of the second worm gear (76), the second worm gear (76) is slidably connected to the driving rod (73), a driving bar (731) is fixedly connected to the outer surface of the second worm gear (76), the driving bar (731) is slidably connected to the slide groove (761), a scissor frame (75) is provided below the mounting block (74), a center rod (751) is fixedly connected to the middle of the scissor frame (75), and a second fixed rod (752) is fixedly connected to one end of the scissor frame (75).

2. A point-by-point multi-level automatic welding mechanism according to claim 1, characterized in that: A sliding rod (71) is fixedly connected between the two second support frames (78), the sliding rod (71) is slidably connected to the movable block (741), the bottom of the movable block (741) is fixedly connected to the center rod (751), and one end of the second worm gear (77) is fixedly connected to a transmission rod (771).

3. A point-by-point multi-stage automatic welding mechanism according to claim 2, characterized in that: One end of the transmission rod (771) passes through the mounting block (74), and one end of the transmission rod (771) is fixedly connected to a welding gun (6).

4. A point-by-point multi-stage automatic welding mechanism according to claim 3, characterized in that: The bottom of the second support frame (78) is fixedly connected to the top of the lifting frame (3), one of the movable blocks (741) is threadedly connected to the threaded rod (72), and the other movable blocks (741) are slidably connected to the threaded rod (72).

5. The point-by-point multi-stage automatic welding mechanism according to claim 4 is characterized in that: The transmission mechanism (5) comprises a driving bevel gear (52) and a first worm gear (57); both sides of the driving bevel gear (52) are meshingly connected with driven bevel gears (53); one end of the driven bevel gear (53) is fixedly connected to a connecting rod (54); one end of the connecting rod (54) is fixedly connected to a threaded rod (72).

6. The point-by-point multi-stage automatic welding mechanism according to claim 5, characterized in that: The top of the first worm (57) is meshingly connected to a first worm wheel (56), and both sides of the first worm wheel (56) are fixedly connected to first fixing rods (55).

7. The point-by-point multi-stage automatic welding mechanism according to claim 6 is characterized in that: One end of the first worm gear (57) is rotatably connected to a first support frame (59); the bottom of the first support frame (59) is fixedly connected to a fixed frame (4); a second drive motor (58) is fixedly connected to an inner wall of the fixed frame (4); and an output end of the second drive motor (58) is fixedly connected to the first worm gear (57).

8. The point-by-point multi-stage automatic welding mechanism according to claim 7 is characterized in that: A first drive motor (51) is mounted on the top of the fixing frame (4), and an output end of the first drive motor (51) is fixedly connected to the driving bevel gear (52).

9. The point-by-point multi-stage automatic welding mechanism according to claim 1, characterized in that: One end of the driving rod (73) passes through the second support frame (78), and one end of the driving rod (73) is fixedly connected to two ends of the first fixing rod (55).

10. The point-by-point multi-level automatic welding mechanism according to claim 1, characterized in that: A slide rail (11) is fixedly connected to one side of the mounting frame (1), two guide blocks (13) are slidably connected to the outer surface of the slide rail (11), one end of the guide block (13) is fixedly connected to the fixed frame (4), a servo motor (2) is installed in the center of the top of the mounting frame (1), and the output end of the servo motor (2) is fixedly connected to the screw rod (12).

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