Multi-station synchronous welding device for plastic-lined steel mixing tank end head

Abstract

The application provides a steel lining plastic stirring tank head multi-station synchronous welding device, belonging to the technical field of head processing, comprising a base, the middle of the upper surface of the base is provided with a stand, the upper end of the stand is provided with a mounting seat, the upper surface of the mounting seat is provided with a limiting and fixing device, and the circumferential surface of the upper end of the limiting and fixing device is fixedly provided with a head, the circumferential surface of the mounting seat is provided with a base through a rotating mechanism, the upper surface of the base is provided with a welding gun, the base and the welding gun are both circumferentially arranged with six groups, and the rotating mechanism comprises an annular rotating plate, a planetary wheel and a fixed tooth ring; the adjusting mechanism is arranged, so that the ladder-shaped lifting platform moves upwards, then when the base drives the pulley to move to contact the ladder-shaped lifting platform, the base drives the welding gun to move upwards, the welding gun is separated from the welding point, an additional motor is not needed to drive, linear welding and skip welding are supported, the head with a reinforcing rib or an opening is adapted, and the cost is reduced and there is no signal delay.

Description

Technical Field

[0001] This invention belongs to the field of end cap processing technology, specifically a multi-station synchronous welding device for steel-lined plastic mixing tank end caps. Background Technology

[0002] There are many types of heads. According to their application, they can be divided into pressure heads and atmospheric pressure heads. According to their shape, they can be divided into elliptical heads, butterfly heads, spherical heads, hemispherical heads, arched heads, flat-bottomed heads, and conical heads, etc. Elliptical heads can be further divided into EHA and EHB based on their inner and outer diameters, while butterfly heads are divided into DHA and DHB based on the calculation method of their total inner height. During the manufacturing process, to improve the overall strength of the head, reinforcing ribs distributed in a ring are welded along the center of the inner wall, thereby increasing the overall strength of the head.

[0003] Traditional welding equipment only supports continuous welding and cannot flexibly switch between skip welding modes, making it difficult to adapt to the welding requirements of different head structures (such as reinforcing ribs, openings, etc.). Although some drive devices can be used to realize the skip welding function of the welding gun, if the skip welding function relies on electronic control (such as servo motor lifting), the cost is high and there are signal delay problems. The mechanical structure is complex, and traditional welding equipment usually uses a single welding gun for welding, which requires a 360° rotation to complete one round of welding, which takes a long time and has low production efficiency. The welding path of a single welding gun is long, and it is easy to deviate or shake during the movement, resulting in a decrease in welding accuracy and affecting the weld quality.

[0004] Therefore, we propose a multi-station synchronous welding device for steel-lined plastic mixing tank heads to solve the problems encountered above. Summary of the Invention

[0005] The purpose of this invention is to address the problems of traditional welding devices that only support continuous welding, cannot flexibly switch between skip welding modes, and are difficult to adapt to the welding requirements of different head structures (such as reinforcing ribs, openings, etc.). Although some drive devices can be used to realize the skip welding function of the welding gun, if the skip welding function relies on electronic control (such as servo motor lifting), the cost is high and there are signal delay problems. The mechanical structure is also complex. In addition, traditional welding devices usually use a single welding gun for welding, which requires a 360° rotation to complete one round of welding, which takes a long time and has low production efficiency. The welding path of a single welding gun is long, and it is easy to deviate or shake during the movement, resulting in a decrease in welding accuracy and affecting the weld quality. Therefore, a multi-station synchronous welding device for steel-lined plastic mixing tank heads is proposed.

[0006] The objective of this invention can be achieved through the following technical solution: A base is included, with a column positioned in the middle of the upper surface of the base. A mounting seat is positioned at the upper end of the column. A limiting and fixing device is provided on the upper surface of the mounting seat, and a head is fixedly placed on the circumferential surface of the upper end of the limiting and fixing device. A base is movably connected to the circumferential surface of the mounting seat via a rotating mechanism. A welding torch is positioned on the upper surface of the base. Six sets of welding torches are arranged in a circumferential array on both the base and the base. The rotating mechanism includes an annular rotating plate, planetary gears, and a fixed gear ring. Six sets of planetary gears are arranged, with the upper ends of each of the six sets of planetary gears connected to the six sets of bases via connecting rods. This allows the six sets of welding torches to rotate simultaneously and perform synchronous welding on the head when the rotating mechanism is in operation. The outer circumferential surface of the annular rotating plate meshes with the planetary gears via an external gear ring. The other side of the planetary gears meshes with the fixed gear ring. An adjustment mechanism is provided inside the fixed gear ring, and six sets of adjustment mechanisms are arranged in a circumferential array.

[0007] The adjustment mechanism includes a mounting plate, and there are three sets of mounting plates. All three sets of mounting plates are set on the lower surface of the fixed gear ring. A threaded rod is rotatably mounted in the middle of the mounting plate. A hollow threaded column is threadedly connected to the circumferential surface of the upper end of the threaded rod. A trapezoidal lifting platform is set at the upper end of the hollow threaded column. A vertical through groove matching the trapezoidal lifting platform is opened inside the fixed gear ring, and the trapezoidal lifting platform is located inside the vertical through groove.

[0008] In a preferred embodiment of the present invention, the rotating mechanism further includes a servo motor, which is disposed on the upper surface of the base and located on the left side of the column. The power output end of the servo motor is connected to a rotating shaft, and a rotating spur gear is disposed on the circumferential surface of the rotating shaft. The rotating spur gear is meshed with an annular rotating plate through an internal gear ring.

[0009] In a preferred embodiment of the present invention, an annular moving groove 1 is provided inside the upper end of both the mounting base and the fixed toothed ring. Pulleys are provided at both ends of the lower surface of the base. The two pulleys are slidably installed inside the two annular moving grooves 1. Annular moving grooves 2 are provided on both the left and right sides of the two annular moving grooves 1. The two annular moving grooves 2 located on the inner side are respectively opened on the circumferential side wall of the mounting base and the inner side wall of the annular rotating plate. The two ends of the pulley rotating shaft are respectively movably inserted into the interior of the two annular moving grooves 2.

[0010] In a preferred embodiment of the present invention, the upper end of the annular moving groove two is provided with an expansion groove, and there are six sets of expansion grooves. One set of expansion grooves is provided between every two bases, and each set of expansion groove arrays is provided with three expansion grooves. The expansion grooves and the trapezoidal lifting platform are on the same vertical plane.

[0011] In a preferred embodiment of the present invention, a supporting rotating rod is provided at the lower end of the planetary gear, an annular rotating groove is provided on the upper surface of the base, the lower end of the supporting rotating rod is rotatably installed inside the annular rotating groove, and the lower surface of the fixed gear ring is fixedly connected to the upper surface of the base through a fixing plate.

[0012] In a preferred embodiment of the present invention, a positioning plate is movably mounted on the outer end of the lower surface of the base, and the lower end of the positioning plate is movably mounted inside the lower end of the fixed toothed ring. An annular groove matching the lower end of the positioning plate is formed inside the lower end of the fixed toothed ring. A movable groove is formed inside the outer end of the base, and the upper end of the positioning plate is disposed inside the movable groove.

[0013] In a preferred embodiment of the present invention, a connecting rod is rotatably mounted on the middle of the lower surface of the base, a cross connecting block is provided at the lower end of the connecting rod, a rotating block is provided at the lower end of the cross connecting block, a circular lifting groove is provided inside the planetary gear, a cross lifting groove is provided at the upper end of the planetary gear, and the cross lifting groove is connected to the circular lifting groove, the rotating block is rotatably mounted inside the circular lifting groove, and the cross connecting block is inserted into the inside of the cross lifting groove.

[0014] In a preferred embodiment of the present invention, a baffle is provided at the lower end of the trapezoidal lifting platform, and the length of the baffle is greater than the length of the vertical through groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) By setting the adjustment mechanism, the trapezoidal lifting platform moves upward, and then when the base drives the pulley to move to contact the trapezoidal lifting platform, the base drives the welding gun to move upward, the welding gun leaves the welding point, and the skip welding work is realized. No additional motor drive is required. It supports straight welding and skip welding, adapts to end caps with reinforcing ribs or openings, reduces costs and has no signal delay.

[0017] (2) By setting the second annular moving groove and the expansion groove, the rotating shaft of the pulley can move inside the second annular moving groove and the expansion groove, which solves the problem of pulley sinking caused by the gap of the inclined surface of the trapezoidal lifting platform, and ensures that the welding torch moves smoothly during the switching of skip welding, without the risk of jamming or suspension.

[0018] (3) With the six sets of welding guns in a circular array, each set only needs to rotate 60 degrees to complete one round of welding, which increases efficiency by 6 times and significantly shortens the welding cycle, making it suitable for mass production. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a perspective view of the present invention.

[0022] Figure 3 This is a first side sectional view of the adjustment mechanism of the present invention;

[0023] Figure 4 This is a second side sectional view of the adjustment mechanism of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the rotating mechanism of the present invention;

[0025] Figure 6 This is an exploded view of the planetary gear in this invention.

[0026] In the diagram: 1. Base; 2. Column; 3. Mounting seat; 4. Limiting and fixing device; 5. Rotating mechanism; 501. Servo motor; 502. Rotating shaft; 503. Rotating spur gear; 504. Annular rotating plate; 505. Planetary gear; 506. Fixed gear ring; 507. Annular moving groove one; 508. Annular moving groove two; 509. Expansion groove; 510. Supporting rotating rod; 511. Fixing plate; 6. Base; 7. Adjusting mechanism; 701. Mounting plate; 702. Threaded rod; 703. Hollow threaded column; 704. Trapezoidal lifting platform; 705. Baffle; 8. Welding torch; 9. End cap; 10. Positioning plate; 11. Movable groove; 12. Connecting rod; 13. Cross connecting block; 14. Rotating block; 15. Circular lifting groove; 16. Cross lifting groove; 17. Pulley. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0028] Please see Figure 1 - Figure 6As shown, a multi-station synchronous welding device for steel-lined plastic mixing tank heads includes a base 1, a column 2 disposed in the middle of the upper surface of the base 1, a mounting base 3 disposed at the upper end of the column 2, a limiting and fixing device 4 disposed on the upper surface of the mounting base 3, and a head 9 fixedly placed on the circumferential surface of the upper end of the limiting and fixing device 4. The limiting and fixing device 4 is an existing device for limiting and fixing the head 9, which is a commonly used device in this field, so it is not shown or described in detail. The circumferential surface of the mounting base 3 is movably connected to a base 6 through a rotating mechanism 5. A welding torch 8 is disposed on the upper surface of the base 6. A rotary motor is disposed at the outer end of the welding torch 8. When the welding torch 8 is not in use, the rotary motor can drive the welding torch 8 to rotate axially, so that the welding torch 8 is away from the head 9. At this time, it is convenient for the workers to place the head 9 vertically on the limiting and fixing device 4 or remove it from the device. During the disassembly and assembly process, there will be no collision with the welding torch 8, avoiding damage to the device and affecting its use.

[0029] The base 6 and welding torch 8 are each arranged in a circumferential array of six sets. The rotating mechanism 5 includes an annular rotating plate 504, planetary gears 505, and a fixed gear ring 506. There are six sets of planetary gears 505, and the upper ends of each set are connected to the six bases 6 via connecting rods 12. This allows the six welding torches 8 to rotate simultaneously and weld the end cap 9 synchronously when the rotating mechanism 5 is working. A supporting rotating rod 510 is provided at the lower end of each planetary gear 505. An annular rotating groove is formed on the upper surface of the base 1, and the lower end of the supporting rotating rod 510 is rotatably installed inside the annular rotating groove. The lower surface of the fixed gear ring 506... The fixed plate 511 is fixedly connected to the upper surface of the base 1. The setting of the supporting rotating rod 510 and the annular rotating groove can support the planetary gear 505 without affecting its revolution and rotation. The positioning plate 10 is movably installed on the outer end of the lower surface of the base 6, and the lower end of the positioning plate 10 is movably installed inside the lower end of the fixed gear ring 506. The setting of the positioning plate 10 further restricts the base 6, so that when the base 6 is subjected to the torque of the revolution and rotation of the planetary gear 505, it can be smoothly converted into a horizontal moving force, so that the base 6 can stably rotate and move horizontally. The lower end of the fixed gear ring 506 has an annular groove that matches the lower end of the positioning plate 10. The annular groove provides movement space for the lower end of the positioning plate 10, allowing the positioning plate 10 to rotate and move together with the base 6. The outer end of the base 6 has a movable groove 11, and the upper end of the positioning plate 10 is located inside the movable groove 11. The movable groove 11 provides movement space for the positioning plate 10, preventing the base 6 from colliding and jamming with the positioning plate 10 when it moves vertically. The rotating mechanism 5 also includes a servo motor 501, which is mounted on the base. The upper surface of 1 is located on the left side of the column 2. The power output end of the servo motor 501 is connected to the rotating shaft 502. The upper end of the rotating shaft 502 is rotatably connected to the upper end of the column 2, which limits and supports the rotating shaft 502, making the rotation of the rotating shaft 502 more stable. A rotating spur gear 503 is provided on the circumferential surface of the rotating shaft 502. The rotating spur gear 503 is meshed with the annular rotating plate 504 through an internal gear ring. The inner circumferential side wall of the annular rotating plate 504 is rotatably connected to the outer circumferential side wall of the mounting base 3, which supports the annular rotating plate 504 without affecting its rotation.

[0030] It should be noted that the setup of six welding torches 8 allows all six torches 8 to work together when welding the end cap 9. Each torch 8 only needs to rotate 60 degrees to complete a full circle and finish welding the end cap 9, which is more efficient. It eliminates the need for each torch 8 to rotate a full circle, which is inefficient and increases the complexity of wiring around the device. In addition, the six torches 8 shorten the overall travel path of the torches, reducing the risk of deviation or swaying during movement and improving the overall welding quality.

[0031] The outer circumferential surface of the annular rotating plate 504 meshes with the planetary gear 505 through the external gear ring. The other side of the planetary gear 505 meshes with the fixed gear ring 506. An adjustment mechanism 7 is provided inside the fixed gear ring 506, and six sets of adjustment mechanisms 7 are arranged in a circumferential array.

[0032] The adjusting mechanism 7 includes a mounting plate 701, and three sets of mounting plates 701 are provided. All three sets of mounting plates 701 are located on the lower surface of the fixed gear ring 506. A threaded rod 702 is rotatably mounted in the middle of the mounting plate 701. A hollow threaded column 703 is threadedly connected to the circumferential surface of the upper end of the threaded rod 702. A trapezoidal lifting platform 704 is provided at the upper end of the hollow threaded column 703. A vertical through groove matching the trapezoidal lifting platform 704 is opened inside the fixed gear ring 506, and the trapezoidal lifting platform 704 is located inside the vertical through groove. The vertical through groove provides movement space for the trapezoidal lifting platform 704, allowing it to move smoothly in the vertical direction. The lower end of the trapezoidal lifting platform 704... A baffle 705 is provided, the length of which is greater than the length of the vertical through groove. The baffle 705 limits the upward movement distance of the trapezoidal lifting platform 704, preventing the hollow threaded column 703 from moving too far upward and causing it to detach from the threaded rod 702. This allows the hollow threaded column 703 to move stably and vertically on the threaded rod 702. When three sets of mounting plates 701 are provided in each adjustment mechanism 7, it is possible to select whether to perform a single-stage, double-stage, or triple-stage welding during the welding process, based on the actual situation of the existing end cap 9. It is also possible to use the corresponding trapezoidal lifting platform 704 according to different positions, thus improving the flexibility of the adjustment mechanism 7 in use.

[0033] It should be noted that the six sets of adjustment mechanisms 7 are respectively set on the movement paths of the six bases 6. When the upper ends of all the trapezoidal lifting platforms 704 in the adjustment mechanism 7 are flush with the inner bottom wall of the fixed toothed ring 506, the base 6 drives the welding torch 8 to move and perform straight welding on the end cap 9. When the trapezoidal lifting platform 704 moves upward, so that a slope is formed on the movement path of the base 6, the base 6 drives the welding torch 8 to move and perform skip welding on the end cap 9. It can switch between different welding modes and is suitable for end caps 9 with different settings, thus improving the applicability of the device. Moreover, the setting of the trapezoidal lifting platform 704 allows for hard contact control of the lifting of the base 6 and the welding torch 8, eliminating the need for motors or other drive equipment, reducing costs, and eliminating electronic signal delay issues. Welding states can be switched simply by adjusting the lifting of the trapezoidal lifting platform 704.

[0034] Both the mounting base 3 and the fixing ring 506 have annular moving grooves 507 inside their upper ends. Pulleys 17 are provided at both ends of the lower surface of the base 6. The two pulleys 17 are slidably installed inside the two annular moving grooves 507. The pulleys 17 and the annular moving grooves 507 limit the movement of the base 6, preventing the planetary gear 505 from rotating and causing the base 6 to rotate. This ensures that the rotational force of the planetary gear 505 is smoothly converted into a horizontal pushing force on the base 6. Annular moving grooves 507 are provided on both the left and right sides of the two annular moving grooves 507. The second groove 508, located on the inner side, has two annular movable grooves 508 respectively opened on the circumferential side wall of the mounting base 3 and the inner side wall of the annular rotating plate 504. The two ends of the rotating shaft of the pulley 17 are respectively movably inserted into the two annular movable grooves 508. The setting of the annular movable grooves 508 can limit the rotating shaft of the pulley 17, preventing the base 6 from driving the pulley 17 to move upward too much and disengage from the fixed toothed ring 506 and the mounting base 3. At the same time, it further limits the base 6, preventing the base 6 from shifting and rotating, and improving the welding quality of the welding gun 8 above the base 6.

[0035] An expansion groove 509 is provided at the upper end of the annular moving groove 508, and there are six sets of expansion grooves 509. One set of expansion grooves 509 is provided between every two bases 6, and each set of expansion grooves 509 array has three. The expansion grooves 509 and the trapezoidal lifting platform 704 are on the same vertical plane. The setting of the expansion grooves 509 provides movement space for the rotation shaft of the pulley 17 when the trapezoidal lifting platform 704 moves upward. When the pulley 17 moves to contact the trapezoidal lifting platform 704, the pulley 17 will continue to move and will move vertically upward during the horizontal movement. At this time, the rotation shaft of the pulley 17 will move into the interior of the expansion groove 509 and will not collide and jam with the inner wall of the fixed toothed ring 506, the mounting base 3 and the annular rotating plate 504, so that the base 6 and the pulley 17 can rotate smoothly in the horizontal direction.

[0036] It should be noted that the annular moving groove 508 avoids the defects caused by the trapezoidal lifting platform 704. When the trapezoidal lifting platform 704 is not in use, its upper end is flush with the inner bottom of the fixed toothed ring 506. Due to the inclined design on both sides, there is a gap between the trapezoidal lifting platform 704 and the fixed toothed ring 506. If the annular moving groove 508 is not provided, when the base 6 moves the pulley 17 to the defect, the pulley 17 will sink or bump and shake, causing the base 6 to be unstable, which in turn affects the use of the welding torch 8. However, because the annular moving groove 508 limits the height of the pulley 17, the pulley 17 will not sink or bump when it moves to the defect. Although the pulley 17 will rotate in mid-air, the rotation shaft of the pulley 17 supports it and does not affect the movement of the base 6, so that the welding work can proceed normally.

[0037] A connecting rod 12 is rotatably mounted on the middle of the lower surface of the base 6. A cross connecting block 13 is provided at the lower end of the connecting rod 12, and a rotating block 14 is provided at the lower end of the cross connecting block 13. A circular lifting groove 15 is opened inside the planetary gear 505, and a cross lifting groove 16 is opened at the upper end of the planetary gear 505. The cross lifting groove 16 is connected to the circular lifting groove 15. The rotating block 14 is rotatably mounted inside the circular lifting groove 15, and the cross connecting block 13 is inserted into the cross lifting groove 16, so that the cross connecting block 13 can move vertically inside the cross lifting groove 16 smoothly. The planetary gear 505 can smoothly drive the connecting rod 12 to rotate through the cross connecting block 13. The diameter of the rotating block 14 and the circular lifting groove 15 is larger than the diameter of the cross connecting block 13 and the cross lifting groove 16, so that when the base 6 moves upward, the connecting rod 12, the cross connecting block 13 and the rotating block 14 can move upward smoothly, and the rotating block 14 will not move out of the cross lifting groove 16, avoiding complete detachment and affecting the use of the connecting rod 12.

[0038] It should be noted that because of the setting of six sets of welding torches 8, the six sets of welding torches 8 can work synchronously. Only a rotation of 60 degrees is needed to form a circle of weld points. Therefore, when the welding torches 8 are working, they only need to rotate 60 degrees each time. After the welding is completed, the servo motor 501 will rotate in the opposite direction so that all six sets of welding torches 8 return to their initial positions, avoiding the welding torches 8 from rotating continuously and causing wires to get tangled.

[0039] In use, the end cap 9 to be welded is placed on the limiting and fixing device 4 and fixed. Then, the output end of the welding torch 8 is oriented towards the welding point of the end cap 9. The servo motor 501 and the welding torch 8 are then started. The servo motor 501 drives the rotating shaft 502 and the rotating spur gear 503 to rotate. The rotation of the rotating spur gear 503 drives the annular rotating plate 504 to rotate via the internal gear ring. The annular rotating plate 504 drives the planetary gear 505 to rotate via the external gear ring. The planetary gear 505, in cooperation with the fixed gear ring 506, rotates around the column 2 as the center of rotation. The device revolves around the central axis and rotates on its own axis. Then, the rotational force of the central axis and rotation is converted into a horizontal thrust on the base 6 through the connecting rod 12, the cross connecting block 13, and the rotating block 14. This causes the base 6 to rotate around the column 2 as the center of rotation. Subsequently, the six sets of bases 6 will drive the six sets of welding torches 8 to rotate around the end cap 9 to perform welding work on the end cap 9. After the base 6 drives the welding torches 8 to rotate 60 degrees, the welding work is completed. Then, the rotary motor is started, causing the welding torches 8 to rotate axially. At this time, the welded end cap 9 can be vertically removed from the device.

[0040] When it is necessary to perform skip welding on the end cap 9, align the position of the end cap 9 to be skip welded with the adjustment mechanism 7, and then rotate the corresponding threaded rod 702. The rotation of the threaded rod 702 drives the hollow threaded column 703 to move upward, which in turn drives the trapezoidal lifting platform 704 and the baffle 705 to move upward. After the upper surface of the baffle 705 abuts against the lower surface of the fixed toothed ring 506, the movement of the trapezoidal lifting platform 704 is completed.

[0041] Then, the servo motor 501 and welding torch 8 are restarted. The servo motor 501 drives the base 6 and welding torch 8 to rotate horizontally around the end cap 9 through the connecting parts. However, when the pulley 17 at the bottom of the base 6 moves to the trapezoidal lifting platform 704, the pulley 17 will move upward, driving the base 6 and welding torch 8 to move upward. At this time, the welding torch 8 is separated from the welding point and does not perform welding work on the end cap 9. Then, when the pulley 17 moves from the other side of the trapezoidal lifting platform 704 to the inside of the annular moving groove 1 507, the rotation shaft of the pulley 17 will also move synchronously from the expansion groove 509 to the inside of the annular moving groove 2 508, so that the welding torch 8 can continue to perform welding work on the end cap 9.

[0042] 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. A multi-station synchronous welding device for steel-lined plastic mixing tank heads, comprising a base (1), wherein a column (2) is provided in the middle of the upper surface of the base (1), a mounting seat (3) is provided at the upper end of the column (2), a limiting and fixing device (4) is provided on the upper surface of the mounting seat (3), and a head (9) is fixedly placed on the circumferential surface at the upper end of the limiting and fixing device (4), characterized in that, The circumferential surface of the mounting base (3) is movably connected to the base (6) via a rotating mechanism (5). A welding torch (8) is provided on the upper surface of the base (6). The base (6) and the welding torch (8) are arranged in a circumferential array of six groups. The rotating mechanism (5) includes an annular rotating plate (504), planetary gears (505), and a fixed gear ring (506). The planetary gears (505) are arranged in six groups. The upper ends of the six groups of planetary gears (505) are connected by a connecting rod (12). The six sets of bases (6) are not connected to each other, so that when the rotating mechanism (5) is working, the six sets of welding guns (8) will rotate simultaneously to perform welding work on the end cap (9). The outer circumferential surface of the annular rotating plate (504) meshes with the planetary gear (505) through the external toothed ring. The other side of the planetary gear (505) meshes with the fixed toothed ring (506). The fixed toothed ring (506) is provided with an adjustment mechanism (7) inside, and the adjustment mechanism (7) is arranged in a circumferential array of six sets. The adjustment mechanism (7) includes a mounting plate (701), and the mounting plate (701) is provided in three sets. All three sets of mounting plates (701) are provided on the lower surface of the fixed toothed ring (506). A threaded rod (702) is rotatably mounted in the middle of the mounting plate (701). A hollow threaded column (703) is threadedly connected to the circumferential surface of the upper end of the threaded rod (702). A trapezoidal lifting platform (704) is provided at the upper end of the hollow threaded column (703). A vertical through groove matching the trapezoidal lifting platform (704) is opened inside the fixed toothed ring (506), and the trapezoidal lifting platform (704) is located inside the vertical through groove. The upper end of the mounting base (3) and the fixed toothed ring (506) are both provided with annular moving groove 1 (507). The lower surface of the base (6) is provided with pulleys (17) at both ends. The two pulleys (17) are slidably installed inside the two annular moving grooves 1 (507). The two annular moving grooves 1 (507) are provided on the left and right sides. The two annular moving grooves 2 (508) located on the inner side are respectively opened on the circumferential side wall of the mounting base (3) and the inner side wall of the annular rotating plate (504). The two ends of the rotating shaft of the pulley (17) are respectively movably inserted into the two annular moving grooves 2 (508). A connecting rod (12) is rotatably mounted on the middle of the lower surface of the base (6). A cross connecting block (13) is provided at the lower end of the connecting rod (12). A rotating block (14) is provided at the lower end of the cross connecting block (13). A circular lifting groove (15) is provided inside the planetary gear (505). A cross lifting groove (16) is provided at the upper end of the planetary gear (505). The cross lifting groove (16) is connected to the circular lifting groove (15). The rotating block (14) is rotatably mounted inside the circular lifting groove (15). The cross connecting block (13) is inserted into the cross lifting groove (16).

2. The multi-station synchronous welding device for steel-lined plastic mixing tank heads according to claim 1, characterized in that, The rotating mechanism (5) also includes a servo motor (501), and the servo motor (501) is located on the upper surface of the base (1) and on the left side of the column (2). The power output end of the servo motor (501) is connected to a rotating shaft (502). A rotating spur gear (503) is provided on the circumferential surface of the rotating shaft (502). The rotating spur gear (503) is meshed with the annular rotating plate (504) through an internal gear ring.

3. The multi-station synchronous welding device for steel-lined plastic mixing tank heads according to claim 1, characterized in that, The upper end of the second annular moving groove (508) is provided with an expansion groove (509), and there are six sets of expansion grooves (509). Each set of expansion grooves (509) is provided between every two bases (6), and each set of expansion grooves (509) is arranged in an array of three. The expansion grooves (509) and the trapezoidal lifting platform (704) are on the same vertical plane.

4. The multi-station synchronous welding device for steel-lined plastic mixing tank heads according to claim 1, characterized in that, The lower end of the planetary gear (505) is provided with a support rotating rod (510), and the upper surface of the base (1) is provided with an annular rotating groove. The lower end of the support rotating rod (510) is rotatably installed inside the annular rotating groove. The lower surface of the fixed toothed ring (506) is fixedly connected to the upper surface of the base (1) through a fixing plate (511).

5. The multi-station synchronous welding device for steel-lined plastic mixing tank heads according to claim 1, characterized in that, A positioning plate (10) is movably installed on the outer end of the lower surface of the base (6), and the lower end of the positioning plate (10) is movably installed inside the lower end of the fixed toothed ring (506). The lower end of the fixed toothed ring (506) has an annular sliding groove that matches the lower end of the positioning plate (10). The outer end of the base (6) has a movable groove (11), and the upper end of the positioning plate (10) is located inside the movable groove (11).

6. The multi-station synchronous welding device for steel-lined plastic mixing tank heads according to claim 1, characterized in that, The lower end of the trapezoidal lifting platform (704) is provided with a baffle (705), the length of which is greater than the length of the vertical through groove.

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