Auxiliary welding system applied to automobile rear floor and side wall assembly

Abstract

The application discloses an auxiliary welding system applied to an automobile rear floor and side wall assembly, which comprises a production line support, side edge frames are arranged at the top of both ends of the production line support, a production line rotating ring frame is arranged on the top of the side edge frame, an adjustable rotating conveying mechanism is arranged on the inner wall of the production line rotating ring frame, and an arc-shaped collecting frame is arranged at the center of the top of the production line support; the special-shaped bracket of the limiting type lifting mechanism can be replaced as required, the electric sliding table drives the matching support point, the assembly can be quickly transported to the production line rotating ring frame, the precise positioning and preliminary limiting are realized by cooperating with the driving motor set and related components, the production line rotating ring frame is convenient for welding and inverted impurity removal, the ring-shaped welding frame and the movable base cooperate to realize detailed welding, and the anti-dropping gripper realizes multiple limiting through the rotary cylinder and the electromagnetic iron material grabbing section.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, specifically to an auxiliary welding system applied to the rear floor and side panel assemblies of automobiles. Background Technology

[0002] With social progress and economic development, the demand for automobiles continues to grow. To meet the huge market demand, automobile manufacturers need to continuously innovate their technologies, improve production efficiency and product quality, and achieve the goal of high-tech, high-quality and high-efficiency production.

[0003] In automobile production, the welding of the rear floor and side panel assembly is one of the key processes, which directly affects the overall structural strength and safety of the vehicle. Therefore, more advanced auxiliary welding systems are needed to ensure welding quality and production efficiency.

[0004] The structure of the rear floor and side panel assembly of a car is usually quite complex and irregular in shape, with a large number of curves, corners and joints of plates of different thicknesses. This makes it necessary to precisely control the welding path and welding parameters during the welding process to ensure the quality and strength of the weld and avoid welding defects such as incomplete welds, missing welds, and porosity. A lot of heat is generated during the welding process, which can cause thermal deformation of the welded parts. For large thin-plate structural components such as the rear floor and side panel assembly of a car, thermal deformation may affect its dimensional accuracy and assembly accuracy, and thus affect the appearance and performance of the car.

[0005] In conjunction with the above, it should be noted that: Chinese patent application number CN2020103697588 discloses a flexible welding production line for the side panel assembly of an automobile body-in-white. This production line achieves the production and processing of the left and right side panels by setting up symmetrically distributed side panel production lines, reducing robot workstations, reducing investment costs in welding production lines, and effectively reducing the floor space occupied by the production line, thereby improving the utilization rate of the factory site.

[0006] In reality, during use, the side panel assembly needs to be constantly calibrated and adjusted according to its movement position, resulting in a continuous increase in auxiliary equipment on the production line, which in turn increases the overall production efficiency and operating costs. At the same time, the synchronous welding process between the rear floor of the car and the side panel assembly results in low fit of the traditional conveyor, which can easily cause misalignment between the rear floor of the car and the side panel assembly, resulting in welding errors and other phenomena.

[0007] To address the aforementioned technical deficiencies, a solution is proposed. Summary of the Invention

[0008] The purpose of this invention is to provide an auxiliary welding system for use in automotive rear floor and side panel assemblies to solve the problems mentioned above.

[0009] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary welding system applied to the rear floor and side panel assembly of an automobile, comprising a production line support, side frames at the top of both ends of the production line support, a production line rotating ring frame mounted on the top of the side frames, an adjustable rotating conveying mechanism on the inner wall of the production line rotating ring frame, an arc-shaped collecting frame at the top center of the production line support, an annular welding frame on the top of the arc-shaped collecting frame, a welding moving base slidably mounted on the inner wall of the annular welding frame, and a vacuum ring and a welding component at the bottom of the welding moving base;

[0010] The adjustable rotary conveying mechanism includes a column beam plate and a side beam plate. A limiting lifting mechanism is slidably arranged on the inner wall of the column beam plate. Multiple sets of anti-detachment grippers are arranged on the inner wall of the side beam plate. The limiting lifting mechanism includes a transverse frame and a special-shaped bracket.

[0011] Furthermore, the production line support is symmetrically provided with slag discharge troughs at the top of both ends, located between the arc-shaped collection frame and the side frame. The top of both sides of the arc-shaped collection frame is symmetrically provided with linear guide rails. The inner wall of the arc-shaped collection frame is symmetrically provided with matching guide frames. The bottom center of the arc-shaped collection frame is recessed with a low-lying groove connecting the slag discharge trough.

[0012] Furthermore, the bottom of the rotating ring frame of the production line is provided with metal fittings for fixed connection to the side frame, the inner wall of the rotating ring frame of the production line is provided with an annular drive guide rail, and the bottom of the annular drive guide rail is provided with a controllable motor embedded inside the side frame.

[0013] Furthermore, an outer arc frame is provided on the outer wall of the column beam plate, which is slidably sleeved with the annular drive guide rail. A drive motor unit is provided at the bottom of one end of the column beam plate near the outer arc frame. A delivery groove is recessed on the inner wall of the column beam plate, which is slidably sleeved with the transverse frame. A limiting roller connected to the drive motor unit and the transverse frame is provided inside the delivery groove.

[0014] Furthermore, the bottom of the side beam plate is provided with a transverse cylinder embedded in the top surface of the column beam plate, and the bottom of the inner wall of the side beam plate is provided with a rotary cylinder one that connects with the anti-detachment gripper. The anti-detachment gripper is composed of multiple gripping sections and rotary cylinder two spliced ​​together, and the multiple gripping sections are connected through rotary cylinder two.

[0015] Furthermore, symmetrical moving blocks are arranged on both sides of the transverse frame, a straight groove is recessed on the inner wall of the transverse frame, an electric slide table is provided at the bottom of the irregular bracket to slide in cooperation with the straight groove, and a bolt hole is provided at the top of the electric slide table to engage with the irregular bracket.

[0016] Furthermore, linear stepper motors are provided at the bottom of both sides of the annular welding frame, an annular raised guide rail is provided in the middle of the inner wall of the annular welding frame, and unloading grooves are provided at the bottom of both ends of the annular welding frame at an angle.

[0017] Furthermore, the welding mobile base has symmetrically arranged air jets at both ends of the top, and a drive wheel that cooperates with the annular protruding guide rail is arranged at the top of the welding mobile base. A telescopic mechanical arm facing the adjustable rotary conveying mechanism is arranged at the bottom of the welding mobile base. The air extraction ring is sleeved on the outer wall of the bottom of the telescopic mechanical arm, and the welding frame is sleeved at the center of the bottom of the telescopic mechanical arm. A servo motor and an air pump are arranged inside the welding mobile base. The servo motor is equipped with a coupling and is connected to the drive wheel for transmission. The air pump is connected to the air jet and the air extraction ring through an air pipe. A filter screen is arranged on the inner wall of the air extraction ring.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention utilizes a shaped bracket in a limiting lifting mechanism that can be interchanged and adapted to meet the support requirements of the rear floor and side panel assembly of a vehicle. An electric slide can move the shaped bracket to match the bottom support point, greatly improving the flexibility of adapting to different batches of products. The electric slide, combined with the moving block and the delivery slot, can quickly move the limiting lifting mechanism and assembly to the rotating ring frame on the production line. The drive motor unit drives the limiting lifting mechanism to move along the delivery slot, and in conjunction with the side beam plate, anti-detachment gripper, etc., it achieves precise positioning and initial limiting, improving transportation and assembly efficiency, and achieving efficient transportation and positioning.

[0020] 2. This invention utilizes a rotating ring frame on the production line to rotate the rear floor and side panel assembly of the vehicle, facilitating welding operations. It also allows the welding process to be inverted, causing welding impurities to fall onto an arc-shaped collection rack, keeping the assembly surface clean and improving welding quality and service life. The ring welding frame, in conjunction with the welding moving base, enables detailed welding across multiple areas, angles, and dimensions, achieving high efficiency and concentration. This reduces transportation distances and equipment footprint, optimizes the welding process, and provides anti-detachment grippers that achieve multi-angle attachment via a rotary cylinder. The gripper joints are made of electromagnet material, generating magnetic attraction when energized, achieving multi-point contact and limiting of the rear floor and side panel assembly, ensuring component stability during welding and providing multiple limiting fixation.

[0021] 3. This invention uses an air pump to extract high-temperature hot air from the welding area through an air extraction ring, thereby controlling the welding temperature, promoting rapid forming of the welding area, and reducing impurity adhesion and welding defects. After processing, some of the extracted high-temperature air can be used to clean welding impurities in the unloading valve and low-lying trough, ensuring the cleanliness of the welding equipment and the control of the welding environment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the production line support structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the production line support and production line rotating ring frame of the present invention;

[0026] Figure 4 This is a schematic diagram of the adjustable rotary conveying mechanism and the limiting lifting mechanism of the present invention;

[0027] Figure 5 This is a partial three-dimensional structural diagram of the column-beam plate of the present invention;

[0028] Figure 6 This is a schematic diagram of the drive motor assembly of the present invention;

[0029] Figure 7 This is a schematic diagram of the limiting lifting mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the annular welding frame of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the welding movable base of the present invention.

[0032] Reference numerals: 1. Production line support; 101. Arc-shaped collection rack; 102. Linear guide rail; 103. Matching guide frame; 104. Low-lying trough; 105. Side frame; 106. Slag discharge trough; 2. Production line rotating ring frame; 201. Annular drive guide rail; 3. Annular welding frame; 301. Linear stepper motor; 302. Annular raised guide rail; 303. Unloading trough; 4. Adjustable rotary conveyor mechanism; 401. Column beam plate 402. Side beam plate; 403. Anti-detachment gripper; 404. Delivery trough; 405. Outer arc frame; 406. Drive motor assembly; 5. Limiting lifting mechanism; 501. Horizontal transfer frame; 502. Irregular bracket; 503. Electric slide table; 504. Moving block; 6. Welded moving base; 601. Air nozzle; 602. Drive wheel; 603. Telescopic robotic arm; 604. Air extraction ring; 605. Welded parts. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figure 1 - Figure 9 As shown, this embodiment is an auxiliary welding system applied to the rear floor and side panel assembly of an automobile. It includes a production line bracket 1, with side frames 105 at the top of both ends of the production line bracket 1. A production line rotating ring frame 2 is mounted on the top of the side frames 105. An adjustable rotating conveying mechanism 4 is provided on the inner wall of the production line rotating ring frame 2. An arc-shaped collection frame 101 is provided at the top center of the production line bracket 1. An annular welding frame 3 is provided on the top of the arc-shaped collection frame 101. A welding moving base 6 is slidably mounted on the inner wall of the annular welding frame 3. An air extraction ring 604 and a welding part 605 are provided at the bottom of the welding moving base 6.

[0035] In the control system of the overall automotive rear floor and side panel assembly processing production line, the initially assembled automotive rear floor and side panel assembly is limited on the limiting lifting mechanism 5. The special-shaped bracket 502 in the limiting lifting mechanism 5 is replaced and adapted according to the support needs of this batch of automotive rear floor and side panel assembly. After the replacement special-shaped bracket is inserted into the drop hole of the electric slide table 503 by bolts, it is fixed with a suitable nut, and then waits for the automotive rear floor and side panel assembly to be hoisted onto the multiple sets of limited lifting mechanisms 5.

[0036] The production line support 1 has symmetrically arranged slag discharge troughs 106 at the top of both ends, located between the arc-shaped collection frame 101 and the side frame 105. The top of both sides of the arc-shaped collection frame 101 has symmetrically arranged linear guide rails 102. The middle of the inner wall of the arc-shaped collection frame 101 has symmetrically arranged matching guides 103. The bottom center of the arc-shaped collection frame 101 has a recessed groove 104 that connects to the slag discharge trough 106.

[0037] Linear stepper motors 301 are installed at the bottom of both sides of the annular welding frame 3, annular raised guide rails 302 are installed in the middle of the inner wall of the annular welding frame 3, and unloading grooves 303 are installed at the bottom of both ends of the annular welding frame 3 at an angle.

[0038] The annular welding frame 3 is driven to move along the top of the production line support 1 by a linear stepper motor 301 and a linear guide rail 102. The movement range is between the two sets of production line rotating ring frames 2. Based on this, in coordination with the rotation of the production line rotating ring frames 2, adaptive adjustment welding processing is completed on multiple areas, corners and difficult welding points on the rear floor and side panel assembly of the car.

[0039] The welding mobile base 6 has air jets 601 symmetrically arranged at the top of both ends. The top of the welding mobile base 6 is provided with drive wheels 602 that cooperate with the annular protruding guide rail 302. The bottom of the welding mobile base 6 is provided with a telescopic mechanical arm 603 facing the adjustable rotary conveying mechanism 4. The suction ring 604 is sleeved on the bottom outer wall of the telescopic mechanical arm 603, and the welding frame 605 is sleeved on the bottom center of the telescopic mechanical arm 603. The welding mobile base 6 is equipped with a servo motor and an air pump. The servo motor is provided with a coupling and is connected to the drive wheels 602 for transmission. The air pump is connected to the air jets 601 and the suction ring 604 through an air pipe. The inner wall of the suction ring 604 is provided with a filter screen.

[0040] The servo motor inside the welding mobile base 6 is connected to the drive wheel 602 via a coupling, thereby driving the welding mobile base 6 to move along the surface of the annular raised guide rail 302 to adjust the position of the welding part 605. The telescopic mechanical arm 603 drives the welding part 605 to perform multi-angle, multi-axial, and multi-dimensional spatial adjustments, thereby performing detailed welding processing on the rear floor and side panel assembly of the automobile. It should be noted that multiple sets of welding mobile bases 6 can be set up for short-distance, multi-dimensional, and efficient centralized continuous welding processing of the rear floor and side panel assembly of the automobile, thereby significantly reducing the transportation distance of the rear floor and side panel assembly of the automobile and reducing the footprint of the equipment inside the factory.

[0041] The air pump is connected to the jet nozzle 601 and the suction ring 604 via a regulating valve and pipeline. The suction ring 604 follows the welded part 605 close to the welding point area of ​​the rear floor and side panel assembly of the car, which facilitates the concentrated extraction of high-temperature hot air generated by welding in the welding point area, so as to control the temperature of the welding point area, which helps the welding area to form quickly and reduces the adhesion of impurities and welding defects caused by ambient temperature. The extracted high-temperature air is transported through a long pipeline and exposed to the air environment, which helps to continuously cool it down and deliver the air to the air pump. The air pump is equipped with an exhaust port for the active exhaust of most of the air. When the welding moving base 6 is close to the unloading groove 303 area on the annular welding frame 3, the regulating valve guides some air into the jet nozzle 601 for pneumatic cleaning of welding impurities inside the unloading valve and in the depression 104.

[0042] Example 2: This example is an auxiliary welding system applied to the rear floor and side panel assembly of an automobile. It includes an adjustable rotary conveying mechanism 4, which includes a column beam plate 401 and a side beam plate 402. A limiting lifting mechanism 5 is slidably provided on the inner wall of the column beam plate 401. Multiple sets of anti-detachment grippers 403 are provided on the inner wall of the side beam plate 402. The limiting lifting mechanism 5 includes a transverse frame 501 and a special-shaped bracket 502.

[0043] The bottom of the production line rotating ring frame 2 is provided with metal fittings that are fixedly connected to the side frame 105. The inner wall of the production line rotating ring frame 2 is provided with a ring drive rail 201, and the bottom of the ring drive rail 201 is provided with a controllable motor embedded in the side frame 105.

[0044] The rotating ring frame 2 of the production line is connected to the ring drive rail 201 via a coupling, according to the welding requirements of the rear floor and side panel assembly of the automobile. Accordingly, the adjustable rotating conveyor mechanism 4 moves along the surface of the ring drive rail 201 via the arc frame, and drives the rear floor and side panel assembly of the automobile to rotate after being limited, in order to cooperate with the welding process. At the same time, it helps to invert the welding operation of the rear floor and side panel assembly of the automobile according to the welding requirements, so that the welding impurities generated during the welding process fall onto the arc collection frame 101, thereby preventing the welding impurities from falling onto the components around the welding point on the rear floor and side panel assembly of the automobile, helping to keep the surface of the rear floor and side panel assembly of the automobile clean, improving service life and subsequent welding effect.

[0045] An outer arc frame 405 is provided on the outer wall of the column beam plate 401, which is slidably sleeved with the annular drive guide rail 201. A drive motor assembly 406 is provided at the bottom of one end of the column beam plate 401 near the outer arc frame 405. A delivery groove 404 is recessed on the inner wall of the column beam plate 401, which is slidably sleeved with the transverse frame 501. A limiting roller connected to the drive motor assembly 406 and the transverse frame 501 is provided inside the delivery groove 404.

[0046] The bottom of the side beam plate 402 is provided with a transverse cylinder that is embedded in the top surface of the column beam plate 401. The bottom of the inner wall of the side beam plate 402 is provided with a rotary cylinder 1 that is sleeved with the anti-detachment gripper 403. The anti-detachment gripper 403 is composed of multiple gripping sections and rotary cylinder 2 spliced ​​together. The multiple gripping sections are connected through rotary cylinder 2.

[0047] The drive motor 406 is connected to the limiting roller via a coupling. The limiting roller contacts the side wall of the moving block 504, thereby driving the limiting lifting mechanism 5 to move along the delivery groove 404. The side beam plate 402 is driven by the transverse cylinder to slide along the top of the column beam plate 401 and approach the outer wall of the rear floor and side panel assembly, thus initially limiting it. The anti-detachment gripper 403 is driven to rotate by the rotary cylinder one, thereby attaching to the outer wall of the rear floor and side panel assembly. Then, the rotary cylinder two drives multiple gripping joints to adaptively attach to the outer wall of the rear floor and side panel assembly, realizing multi-point contact limiting of the rear floor and side panel assembly. It should be noted that the gripping joints can be made of electromagnet material, so that when the gripping joints contact the metal body of the rear floor and side panel assembly, they can be energized to generate magnetic attraction, thus realizing multiple limiting fixation.

[0048] The transverse frame 501 has symmetrical moving blocks 504 on both sides. The inner wall of the transverse frame 501 has a recessed straight groove. The bottom of the irregular bracket 502 is provided with an electric slide table 503 that slides with the straight groove. The top of the electric slide table 503 is provided with a bolt hole that fits with the irregular bracket 502.

[0049] Before loading the rear floor and side panel assembly of the car, the electric slide table 503 is equipped with a built-in power supply, or a power line connected to the electric slide table 503 is set in a fixed area on the production line to provide power for the electric slide table 503 to drive its operation. The electric slide table 503 drives the irregular bracket 502 to move along the straight groove on the transverse frame 501 to match the bottom support point of the rear floor and side panel assembly of the car waiting to be loaded. After loading is completed, the moving block 504 and the delivery groove 404 work together to move the limiting lifting mechanism 5 and the rear floor and side panel assembly of the car between the rotating ring frame 2 of the production line.

[0050] As can be seen from Embodiments 1 and 2, in terms of flexible adaptation and efficient transportation and positioning, the irregular bracket 502 of the limiting lifting mechanism 5 can be replaced as needed, the electric slide table 503 drives its matching support point, and can also quickly transport the assembly to the rotating ring 2 of the production line, and cooperate with the drive motor group 406 and related components to achieve precise positioning and initial limiting.

[0051] In terms of welding optimization and fixation, the production line rotating ring frame 2 facilitates welding and inverted impurity removal, the ring welding frame 3 works with the moving base to achieve precise welding, and the anti-detachment gripper 403 achieves multiple limits through the rotary cylinder and electromagnet gripper joint; in addition, the air pump uses the suction ring 604 to control the temperature of the welding point and clean welding impurities, thereby achieving welding environment control.

[0052] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An auxiliary welding system for use in automotive rear floor and side panel assemblies, comprising a production line support (1), characterized in that, The production line support (1) has side frames (105) at both ends and top. The side frames (105) have a production line rotating ring frame (2) on top. The production line rotating ring frame (2) has an adjustable rotating conveying mechanism (4) on its inner wall. The production line support (1) has an arc-shaped collection frame (101) at the top center. The arc-shaped collection frame (101) has an annular welding frame (3) on top. The annular welding frame (3) has a welding moving base (6) slidably arranged on its inner wall. The welding moving base (6) has an air extraction ring (604) and a welding part (65) at its bottom. The adjustable rotary conveying mechanism (4) includes a column beam plate (401) and a side beam plate (402). A limiting lifting mechanism (5) is slidably provided on the inner wall of the column beam plate (401). Multiple sets of anti-detachment grippers (403) are provided on the inner wall of the side beam plate (402). The limiting lifting mechanism (5) includes a transverse frame (501) and a special-shaped bracket (502). The bottom of the production line rotating ring frame (2) is provided with a metal fitting that is fixedly connected to the side frame (105). The inner wall of the production line rotating ring frame (2) is provided with a ring drive rail (201). The bottom of the ring drive rail (201) is provided with a controllable motor embedded in the side frame (105). The outer wall of the column beam plate (401) is provided with an outer arc frame (405) that is slidably sleeved with the ring drive rail (201). One end of the column beam plate (401) is provided with a drive motor assembly (406) near the outer arc frame (405). The inner wall of the column beam plate (401) is recessed and provided with a delivery groove (404) that is slidably sleeved with the transverse frame (501). The delivery groove (404) is provided with a limiting roller that is connected to the drive motor assembly (406) and the transverse frame (501). The bottom of the side beam plate (402) is provided with a transverse cylinder embedded in the top surface of the column beam plate (401). The bottom of the inner wall of the side beam plate (402) is provided with a rotary cylinder one that is sleeved with the anti-detachment gripper (403). The anti-detachment gripper (403) is composed of multiple gripping sections and rotary cylinder two spliced ​​together. The multiple gripping sections are connected through rotary cylinder two.

2. The auxiliary welding system for use in the rear floor and side panel assembly of an automobile according to claim 1, characterized in that, The production line support (1) has symmetrically arranged slag discharge troughs (106) at the top of both ends, located between the arc-shaped collection frame (101) and the side frame (105). The arc-shaped collection frame (101) has symmetrically arranged linear guide rails (102) at the top of both sides. The arc-shaped collection frame (101) has symmetrically arranged matching guide frames (103) in the middle of the inner wall of the arc-shaped collection frame (101). The arc-shaped collection frame (101) has a low-lying groove (104) at the bottom center that connects to the slag discharge trough (106).

3. The auxiliary welding system applied to the rear floor and side panel assembly of an automobile according to claim 1, characterized in that, The transverse frame (501) is symmetrically provided with moving blocks (504) on both sides. The inner wall of the transverse frame (501) is recessed with a straight groove. The bottom of the irregular bracket (502) is provided with an electric slide (503) that slides with the straight groove. The top of the electric slide (503) is provided with a bolt hole that fits with the irregular bracket (502).

4. The auxiliary welding system for use in the rear floor and side panel assembly of an automobile according to claim 1, characterized in that, Linear stepper motors (301) are provided at the bottom of both sides of the annular welding frame (3), an annular protruding guide rail (302) is provided in the middle of the inner wall of the annular welding frame (3), and unloading grooves (303) are provided at the bottom of both ends of the annular welding frame (3).

5. The auxiliary welding system for use in the rear floor and side panel assembly of an automobile according to claim 4, characterized in that, The welding mobile base (6) has air jets (601) symmetrically arranged at the top of both ends. The top of the welding mobile base (6) is provided with drive wheels (602) that cooperate with the annular protruding guide rail (302). The bottom of the welding mobile base (6) is provided with a telescopic mechanical arm (603) facing the adjustable rotary conveying mechanism (4). The air extraction ring (604) is sleeved on the bottom outer wall of the telescopic mechanical arm (603), and the welding frame (605) is sleeved on the bottom center of the telescopic mechanical arm (603).

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