Automatic welding device for tank body of double-layer oil tank

Abstract

The present application belongs to the field of transport technology, and more particularly to a kind of automatic welding device of double-layer oil tank body, including double-shaft motor and U-shaped limiting plate fixedly installed on the top of bottom plate, and two groups of trusses are slidably installed on the U-shaped limiting plate, two output shafts of the double-shaft motor are respectively fixedly installed with rotating screw, and two rotating screws are respectively penetrated through two groups of trusses and rotatably connected with the U-shaped limiting plate, the top of two trusses is respectively fixedly installed with round plate, and clamping mechanism is respectively arranged and installed on the outer wall of the side of two round plates close to each other.The present application can drive two oil tank bodies to rotate synchronously by synchronous motor rotation, so that the welding gun will not appear alignment misalignment phenomenon when welding oil tank body comprehensively, and then effectively prevent uneven weld formation, welding offset and other quality defects, improve the welding precision and sealing reliability of oil tank body.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and in particular relates to an automatic welding device for the body of a double-walled oil tank. Background Technology

[0002] With the continuous upgrading of oil and gas storage and transportation safety standards, double-walled oil tanks, with their advantages of double protection, leak-proof, corrosion resistance, and high safety, have been widely used in gas stations, chemical oil storage, and other fields. Double-walled oil tanks are a type of oil tank that offers higher safety performance compared to traditional single-walled tanks, effectively preventing soil and water pollution caused by oil leaks. A search revealed publication number CN121289841A, entitled "A Rotary Welding Mechanism for Double-Walled Oil Tanks," which includes a base plate. A bracket is fixedly connected to one side of the upper surface of the base plate. Two guide rods are slidably connected to one side of the upper end of the bracket. A mounting frame is fixedly connected to the lower end of the guide rods. A welding torch is fixedly mounted on one side of the bottom of the mounting frame. Existing automatic welding devices for double-walled oil tanks generally adopt a dual independent motor drive structure, where two motors drive the rotation of the two sides of the tank, cooperating with welding equipment to complete the all-around welding operation of the tank.

[0003] However, after long-term operation, the two independent motors are prone to failure due to factors such as motor wear, parameter deviation, and transmission error, which may prevent them from maintaining precise synchronous operation of the two tanks. During the welding process, speed differences are easily generated, leading to relative rotational offset and misalignment of the two tanks. This defect will directly cause uneven weld formation, welding offset and other quality defects, significantly reducing the welding accuracy and sealing reliability of the tanks, and seriously affecting the overall welding quality of the double-walled oil tanks.

[0004] To address this issue, we propose an automatic welding device for double-walled oil tanks. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing an automatic welding device for the body of a double-walled oil tank.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an automatic welding device for a double-walled oil tank, comprising a dual-axis motor and a U-shaped limiting plate fixedly installed on the top of a base plate, wherein two sets of trusses are slidably installed on the U-shaped limiting plate, and rotating screws are fixedly installed on the two output shafts of the dual-axis motor, and the two rotating screws respectively pass through the two sets of trusses and are rotatably connected to the U-shaped limiting plate. Circular plates are fixedly installed on the top of the two trusses, and clamping mechanisms are respectively installed on the outer walls of the two circular plates on their adjacent sides. The clamping mechanisms clamp and fix the tank body to ensure stability during welding. A gantry plate is fixedly installed on the top of the base plate, and a welding mechanism and a synchronous drive mechanism are respectively installed on the inner wall of the top and the inner wall of the side of the gantry plate. The welding mechanism performs welding operations on the oil tank body, and the synchronous drive mechanism keeps the two oil tank bodies rotating synchronously at all times, thus completing the all-round welding process of the oil tank body without dead angles in conjunction with the welding mechanism.

[0007] In the above-mentioned automatic welding device for a double-walled oil tank, the clamping mechanism includes a clamping motor fixedly mounted on the outer wall of a circular plate and a placement circular tube rotatably mounted on the circular plate. A small gear ring is rotatably mounted on the inner wall of the placement circular tube, and the small gear ring is fixedly connected to the output shaft of the clamping motor through a U-shaped connecting plate. An installation ring plate is fixedly mounted on the inner wall of the placement circular tube, and a plurality of first gears are rotatably mounted on the outer wall of the installation ring plate. A plurality of clearance openings are provided on the placement circular tube, and a first toothed plate is movably arranged in each of the clearance openings. The plurality of first toothed plates mesh with the corresponding first gears, and an arc-shaped clamping plate is fixedly mounted on the bottom of each of the plurality of first toothed plates.

[0008] In the above-mentioned automatic welding device for a double-walled oil tank, the welding mechanism includes two electric push rods fixedly installed on the inner wall of the top of the gantry plate, and the output ends of the two electric push rods are fixedly installed with welding guns through a horizontal plate.

[0009] In the aforementioned automatic welding device for a double-walled oil tank, the synchronous drive mechanism includes a synchronous motor fixedly installed on the inner side wall of the gantry plate. A rotating rod is fixedly installed on the output shaft of the synchronous motor, and a worm gear sleeve is fixedly fitted on the rotating rod. Two vertical plates are fixedly installed on the top of the U-shaped limiting plate. A crossbar is rotatably installed on the outer wall of one of the two vertical plates that are close to each other. A worm wheel is fixedly fitted on the crossbar, and the worm wheel meshes with the worm gear sleeve. A moving gear is slidably fitted on the crossbar, and the moving gear meshes with a large gear ring fixedly fitted on a circular tube. A sliding plate is fixedly installed inside the moving gear, and the sliding plate passes through an opening on the crossbar and is slidably connected to the inner wall of the opening.

[0010] In the above-mentioned automatic welding device for a double-walled oil tank, a lubrication mechanism is provided on the top of the U-shaped limiting plate. The lubrication mechanism applies lubricating oil to the worm sleeve and worm wheel, thereby reducing the friction and wear between the worm sleeve and worm wheel and improving their service life.

[0011] In the above-mentioned automatic welding device for a double-walled oil tank, the lubrication mechanism includes several fan blades fixedly installed on a crossbar and two annular tubes movably sleeved on the crossbar. An upper air inlet is provided on the inner wall of the two annular tubes. A semi-annular baffle is provided above the two annular tubes. Two connecting plates are fixedly installed on the two semi-annular baffles respectively. A rubber sealing frame plate is fixedly installed at the bottom of the four connecting plates. A lubricating oil tank with an open top is fixedly installed on the top of the U-shaped limiting plate. The worm gear sleeve is located inside the lubricating oil tank. The lubricating oil tank is fixedly connected to the two annular tubes through several connecting plates.

[0012] In the above-mentioned automatic welding device for a double-walled oil tank, a cooling mechanism is provided on the top of the rubber sealing frame plate. The cooling mechanism cools the lubricating oil in the lubricating oil tank, avoiding the problem of excessively high lubricating oil temperature and accelerated oxidation and deterioration of the oil during operation, and preventing the lubricating oil from failing due to temperature rise and shortening its service life.

[0013] In the above-mentioned automatic welding device for a double-walled oil tank, the cooling mechanism includes an air inlet on the rubber sealing frame and the lubricating oil tank and a lower air outlet on the lower part of the annular pipe. An air guide pipe is provided between the air inlet and the lower air outlet. Straight rods are rotatably installed on the outer walls of both sides of the air guide pipe. The ends of the two straight rods that are close to each other extend into the air guide pipe and are fixedly installed with rubber sealing plates. The ends of the two straight rods that are far apart from each other are respectively fixedly fitted with second gears, and the two second gears respectively mesh with second tooth plates fixedly installed on the top of the rubber sealing frame.

[0014] In the aforementioned automatic welding device for a double-walled oil tank, the air duct is composed of an upper rigid pipe and a lower retractable corrugated flexible pipe.

[0015] In the above-mentioned automatic welding device for a double-walled oil tank, an annular groove is provided on the outer wall of the large gear ring, and an annular limiting plate is fixedly fitted on the outer wall of the moving gear, and a part of the annular limiting plate is located in the annular groove and is slidably connected to the inner wall of the annular groove.

[0016] Compared with existing technologies, the advantages of an automatic welding device for double-walled oil tanks are:

[0017] 1. By placing two oil tanks inside two placement tubes respectively, starting the clamping motor to rotate and drive the arc-shaped clamping plates to move closer together, the oil tanks are fixedly clamped on the placement tubes. The two oil tanks are moved directly below the welding gun by the rotation of the dual-axis motor. The welding gun moves downward and closer to the two oil tanks by the output shaft of the electric push rod. The two oil tanks rotate synchronously by the rotation of the synchronous motor, so that the welding gun will not misalign when fully welding the oil tanks. This effectively prevents quality defects such as uneven weld formation and welding offset, and improves the welding accuracy and sealing reliability of the oil tanks.

[0018] 2. When the crossbar rotates, it drives the fan blade to rotate, generating wind power, which drives the rubber sealing frame plate to move upward and separate from the worm sleeve. At the same time, the rotation of the worm sleeve continuously applies the lubricating oil in the lubricating oil tank to the worm wheel. The lubricating oil reduces the friction and wear between the worm sleeve and the worm wheel, thereby improving the service life of the worm sleeve and the worm wheel.

[0019] 3. Simultaneously, when the rubber sealing frame moves upward, it rotates from a horizontal state to a vertical downward state, opening the air duct. At this moment, the fan blade rotates, generating airflow that enters the lubricating oil tank through the lower air outlet and air inlet, blowing onto the lubricating oil to cool it down. This prevents the lubricating oil from absorbing too much heat from the worm sleeve and worm wheel, causing excessive temperature and accelerated oxidation and deterioration, thus shortening its service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an automatic welding device for a double-walled oil tank provided by the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0022] Figure 3 yes Figure 2 Enlarged view of section B;

[0023] Figure 4 yes Figure 1 Enlarged view of section C;

[0024] Figure 5 yes Figure 4 Enlarged view of section D in the middle;

[0025] Figure 6 yes Figure 1 The exploded view of the semi-annular baffle, annular pipe, and lubricating oil tank shown;

[0026] Figure 7 yes Figure 1 An exploded view of the first gear and crossbar shown;

[0027] Figure 8 yes Figure 1 The assembly diagram of the semi-annular baffle and the annular tube is shown.

[0028] Figure 9 yes Figure 1 The assembly drawing of the large gear ring, small gear ring, and first gear is shown.

[0029] Figure 10 This is a perspective view of an automatic welding device for a double-walled oil tank provided by the present invention.

[0030] In the diagram: 1. Base plate; 2. Truss; 3. Circular plate; 4. Dual-axis motor; 5. Rotating screw; 6. U-shaped limiting plate; 7. Clamping motor; 8. Large gear ring; 9. Small gear ring; 10. Placement tube; 11. Mounting ring plate; 12. First toothed plate; 13. First gear; 14. Arc-shaped clamping plate; 15. Gantry plate; 16. Electric push rod; 17. Welding gun; 18. Synchronous motor; 19. Crossbar; 20. Worm gear; 21. Worm sleeve; 22. Lubricating oil tank; 23. Rubber sealing frame plate; 24. Fan plate; 25. Annular pipe; 26. Semi-annular baffle; 27. Rubber sealing plate; 28. Second gear; 29. ​​Second toothed plate; 30. Air guide pipe; 31. Moving gear; 32. Annular limiting plate; 33. Sliding plate; 34. Connecting plate. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] like Figures 1-10As shown, an automatic welding device for a double-walled oil tank includes a dual-axis motor 4 and a U-shaped limiting plate 6 fixedly installed on the top of a base plate 1. Two sets of trusses 2 are slidably installed on the U-shaped limiting plate 6. Rotating screws 5 are fixedly installed on the two output shafts of the dual-axis motor 4, and the two rotating screws 5 pass through the two sets of trusses 2 and are rotatably connected to the U-shaped limiting plate 6. Circular plates 3 are fixedly installed on the tops of the two trusses 2. Clamping mechanisms are respectively installed on the outer walls of the two circular plates 3 on their adjacent sides. The clamping mechanisms clamp and fix the tank body to ensure stability during welding. The clamping mechanism includes a clamping motor 7 fixedly installed on the outer wall of the circular plate 3 and a placement circular tube 10 rotatably installed on the circular plate 3. A small gear ring 9 is rotatably installed on the inner wall of the placement circular tube 10, and the small gear ring 9 is fixedly connected to the output shaft of the clamping motor 7 through a U-shaped connecting plate. An installation ring plate 11 is fixedly installed on the inner wall of the placement circular tube 10, and several... A first gear 13 is placed on a circular tube 10, which has several clearance openings. A first toothed plate 12 is movably mounted within each of these clearance openings. To limit the movement of the first toothed plate 12 and make its vertical movement more stable, limit grooves are formed on the outer walls of both sides of the first toothed plate 12. Two limit blocks are fixedly installed on the inner walls of both sides of each clearance opening, with their sides extending into the two limit grooves and slidingly connected to the inner walls of the grooves. Each of the first toothed plates 12 meshes with the corresponding first gear 13, and an arc-shaped clamping plate 14 is fixedly installed at the bottom of each of the first toothed plates 12. A rubber friction plate is fixedly installed on one side of the outer wall of the arc-shaped clamping plate 14. The friction between the tank and the arc-shaped clamping plate 14 is increased by the rubber friction plate, making the tank clamped more stably. A gantry plate 15 is fixedly installed on the top of the bottom plate 1. A welding mechanism and a synchronous drive mechanism are respectively provided on the top inner wall and the side inner wall of the gantry plate 15.The oil tank body is welded by a welding mechanism. A synchronous drive mechanism keeps the two oil tank bodies rotating synchronously, enabling omnidirectional welding of the oil tank bodies without dead angles. The welding mechanism includes two electric push rods 16 fixedly installed on the inner wall of the top of the gantry plate 15. Welding guns 17 are fixedly installed on the output ends of the two electric push rods 16 via a horizontal plate. The synchronous drive mechanism includes a synchronous motor 18 fixedly installed on the inner wall of the side of the gantry plate 15. A rotating rod is fixedly installed on the output shaft of the synchronous motor 18, and a worm gear sleeve 21 is fixedly fitted on the rotating rod. Two vertical plates are fixedly installed on the top of the U-shaped limiting plate 6. A horizontal bar 19 is rotatably installed on the outer wall of the two vertical plates on their adjacent sides. Two through holes are opened on the circular plate 3, and linear shafts are fixedly installed in each of the two through holes. The crossbars 19 are respectively passed through two linear bearings and are slidably connected to the inner walls of the two linear bearings. The linear bearings reduce the friction between the crossbars 19 and the circular plate 3, thereby reducing the wear of the crossbars 19 and increasing their service life. A worm gear 20 is fixedly sleeved on the crossbars 19 and meshes with the worm sleeve 21. A moving gear 31 is slidably sleeved on the crossbars 19 and meshes with a large gear ring 8 fixedly sleeved on the circular tube 10. In order to drive the moving gear 31 to move when the large gear ring 8 moves, so that the large gear ring 8 and the moving gear 31 always remain in a meshing state, an annular groove is opened on the outer wall of the large gear ring 8. An annular limiting plate 32 is fixedly sleeved on the outer wall of the moving gear 31, and a part of the annular limiting plate 32 is located in the annular groove and slidably connected to the inner wall of the annular groove.

[0033] Next, a sliding plate 33 is fixedly installed inside the moving gear 31, and the sliding plate 33 passes through the opening opened on the crossbar 19 and is slidably connected to the inner wall of the opening.

[0034] The top of the U-shaped limiting plate 6 is equipped with a lubrication mechanism. The lubrication mechanism applies lubricating oil to the worm sleeve 21 and worm wheel 20, thereby reducing the friction and wear between the worm sleeve 21 and worm wheel 20 and improving their service life. The lubrication mechanism includes several fan blades 24 fixedly installed on the crossbar 19 and two annular tubes 25 movably sleeved on the crossbar 19. The inner walls of the two annular tubes 25 have upper air inlets. Semi-annular baffles 26 are provided above the two annular tubes 25. Two connecting plates 34 are fixedly installed on the two semi-annular baffles 26 respectively. Rubber sealing frame plates 23 are fixedly installed at the bottom of the four connecting plates 34. A lubricating oil tank 22 with an open top is fixedly installed on the top of the U-shaped limiting plate 6, and part of the worm sleeve 21 is located inside the lubricating oil tank 22. The lubricating oil tank 22 is fixedly connected to the two annular tubes 25 through several connecting plates.

[0035] A cooling mechanism is provided on the top of the rubber sealing frame plate 23. This mechanism cools the lubricating oil in the lubricating oil tank 22, preventing the lubricating oil from overheating and accelerating oxidation and deterioration during operation. It also prevents the lubricating oil from failing due to temperature rise and shortening its service life. The cooling mechanism includes air inlets on the rubber sealing frame plate 23 and the lubricating oil tank 22, and a lower air outlet located below the annular pipe 25. The upper air outlet is larger than the lower outlet, resulting in a greater upward airflow force on the semi-annular baffle plate 26 than a greater downward airflow force on the rubber sealing plate 27 (described below). This ultimately causes the rubber sealing plate 27 to move upwards and is positioned at the air inlet. A duct 30 is provided between the inlet and the lower outlet. The duct 30 consists of an upper rigid pipe and a lower retractable corrugated flexible pipe. The corrugated flexible pipe is retractable so that it will not obstruct the upward movement of the rubber sealing frame plate 23 and affect its normal movement. Straight rods are rotatably installed on the outer walls of both sides of the duct 30. The ends of the two straight rods that are close to each other extend into the duct 30 and are fixedly installed with rubber sealing plates 27. The ends of the two straight rods that are far apart from each other are respectively fixedly fitted with second gears 28, and the two second gears 28 respectively mesh with the second toothed plates 29 fixedly installed on the top of the rubber sealing frame plate 23.

[0036] The operating principle of this invention is described as follows: In the initial state, the lubricating oil tank 22 is filled with lubricating oil, the lower part of the worm sleeve 21 is below the lubricating oil level, the rubber sealing plate 27 is in a horizontal state, blocking the air duct 30, and the rubber sealing frame plate 23 is in close contact with the worm sleeve 21 to block the top opening of the lubricating oil tank 22, reducing the evaporation of lubricating oil. When this device is needed to weld the oil tank, the two oil tanks are first placed in the two placement round tubes 10 respectively. The clamping motor 7 is started to rotate, driving the pinion ring 9 to rotate. The pinion ring 9 rotates, driving the first gear 13 to rotate. The first gear 13 rotates, driving the first tooth plate 12 to move, thereby driving the arc-shaped clamping plates 14 to move closer to each other and contact the oil tanks, fixing the oil tanks on the placement round tubes 10. After the oil tanks are clamped stably, the dual-axis motor 4 is started, driving the two rotating screws to rotate. 5. Rotation causes the two trusses 2 and the oil tank to move closer to each other, so that the two oil tanks are moved into the gantry plate 15 and directly below the welding gun 17. The output shaft of the electric push rod 16 is activated to move the welding gun 17 downward and closer to the two oil tanks. At the same time, the synchronous motor 18 is activated. The synchronous motor 18 rotates, which drives the worm sleeve 21 to rotate. The worm sleeve 21 rotates, which drives the worm wheel 20 to rotate. The worm wheel 20 rotates, which drives the crossbar 19 to rotate. The crossbar 19 rotates, which drives the moving gear 31 to rotate. The moving gear 31 rotates, which drives the large gear ring 8 to rotate. The large gear ring 8 rotates, which drives the round tube 10 and the arc-shaped clamp 14 to rotate. Finally, the two oil tanks rotate synchronously, so that the welding gun 17 will not misalign when fully welding the oil tanks. This effectively prevents quality defects such as uneven weld formation and welding offset, and improves the welding accuracy and sealing reliability of the oil tanks.

[0037] At the same time, when the crossbar 19 rotates, it drives the fan plate 24 to rotate and generate wind. This wind blows onto the semi-ring baffle 26 through the upper air outlet, causing the semi-ring baffle 26 to move upward. This movement, through the connecting plate 34, causes the rubber sealing frame plate 23 to move upward and separate from the worm sleeve 21 (no longer obstructing the rotation of the worm sleeve 21). The rotation of the worm sleeve 21 continuously applies the lubricating oil in the lubricating oil tank 22 to the worm wheel 20. The lubricating oil reduces the friction between the worm sleeve 21 and the worm wheel 20, thereby reducing wear and increasing the service life of the worm sleeve 21 and the worm wheel 20.

[0038] Simultaneously, when the rubber sealing frame plate 23 moves upward, it drives the second toothed plate 29 to move upward, pushing the second gear 28 to rotate and causing the rubber sealing plate 27 to rotate, so that the rubber sealing plate 27 rotates from a horizontal state to a vertical downward state, opening the air guide pipe 30. At this moment, the fan plate 24 rotates and generates air force, which enters the lubricating oil tank 22 through the lower air outlet and air inlet, blowing onto the lubricating oil to cool it down. This prevents the lubricating oil from absorbing a large amount of heat from the worm sleeve 21 and worm wheel 20 when lubricating it, thus preventing the oil from overheating and causing accelerated oxidation and deterioration, which would shorten its service life.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic welding device for a double-walled oil tank, comprising a dual-axis motor (4) and a U-shaped limiting plate (6) fixedly installed on the top of a base plate (1), wherein two sets of trusses (2) are slidably installed on the U-shaped limiting plate (6), characterized in that; Rotating screws (5) are fixedly installed on the two output shafts of the dual-axis motor (4), and the two rotating screws (5) pass through the two sets of trusses (2) and are rotatably connected to the U-shaped limiting plate (6). Circular plates (3) are fixedly installed on the top of the two trusses (2), and clamping mechanisms are respectively installed on the outer walls of the two circular plates (3) that are close to each other. The clamping mechanisms clamp and fix the tank body to ensure stability during welding. A gantry plate (15) is fixedly installed on the top of the bottom plate (1), and welding mechanisms and synchronous drive mechanisms are respectively installed on the top inner wall and the side inner wall of the gantry plate (15). The oil tank body is welded by a welding mechanism, and the two oil tank bodies are kept rotating synchronously by a synchronous drive mechanism, so as to complete the all-round welding process of the oil tank body without dead angles.

2. The automatic welding device for the body of a double-walled oil tank according to claim 1, characterized in that, The clamping mechanism includes a clamping motor (7) fixedly mounted on the outer wall of the circular plate (3) and a placement circular tube (10) rotatably mounted on the circular plate (3). A small gear ring (9) is rotatably mounted on the inner wall of the placement circular tube (10), and the small gear ring (9) is fixedly connected to the output shaft of the clamping motor (7) through a U-shaped connecting plate. An installation ring plate (11) is fixedly mounted on the inner wall of the placement circular tube (10). Several first gears (13) are rotatably mounted on the outer wall of the installation ring plate (11). Several clearance openings are provided on the placement circular tube (10). A first toothed plate (12) is movably arranged in each of the clearance openings. The several first toothed plates (12) mesh with the corresponding first gears (13). An arc-shaped clamping plate (14) is fixedly mounted on the bottom of each of the several first toothed plates (12).

3. The automatic welding device for the body of a double-walled oil tank according to claim 1, characterized in that, The welding mechanism includes two electric push rods (16) fixedly installed on the inner wall of the top of the gantry plate (15), and the output ends of the two electric push rods (16) are fixedly installed with welding guns (17) through the cross plate.

4. The automatic welding device for the body of a double-walled oil tank according to claim 3, characterized in that, The synchronous drive mechanism includes a synchronous motor (18) fixedly installed on the inner side wall of the gantry plate (15). A rotating rod is fixedly installed on the output shaft of the synchronous motor (18), and a worm sleeve (21) is fixedly fitted on the rotating rod. Two vertical plates are fixedly installed on the top of the U-shaped limiting plate (6). A crossbar (19) is rotatably installed on the outer wall of the two vertical plates that are close to each other. A worm wheel (20) is fixedly fitted on the crossbar (19), and the worm wheel (20) meshes with the worm sleeve (21). A moving gear (31) is slidably fitted on the crossbar (19), and the moving gear (31) meshes with a large gear ring (8) fixedly fitted on the round tube (10). A sliding plate (33) is fixedly installed inside the moving gear (31), and the sliding plate (33) passes through the opening on the crossbar (19) and is slidably connected to the inner wall of the opening.

5. The automatic welding device for the body of a double-walled oil tank according to claim 4, characterized in that, The top of the U-shaped limiting plate (6) is provided with a lubrication mechanism. The lubrication mechanism applies lubricating oil to the worm sleeve (21) and worm wheel (20), thereby reducing the friction and wear between the worm sleeve (21) and worm wheel (20) and improving the service life of the worm sleeve (21) and worm wheel (20).

6. The automatic welding device for the body of a double-walled oil tank according to claim 5, characterized in that, The lubrication mechanism includes several fan blades (24) fixedly installed on the crossbar (19) and two annular tubes (25) movably sleeved on the crossbar (19). An upper air inlet is provided on the inner wall of the two annular tubes (25). A semi-annular baffle (26) is provided above the two annular tubes (25). Two connecting plates (34) are fixedly installed on the two semi-annular baffles (26). A rubber sealing frame plate (23) is fixedly installed at the bottom of the four connecting plates (34). A lubricating oil tank (22) with an open top is fixedly installed on the top of the U-shaped limiting plate (6). The worm sleeve (21) is partially located inside the lubricating oil tank (22). The lubricating oil tank (22) is fixedly connected to the two annular tubes (25) through several connecting plates.

7. The automatic welding device for the body of a double-walled oil tank according to claim 6, characterized in that, The top of the rubber sealing frame plate (23) is equipped with a cooling mechanism to cool the lubricating oil in the lubricating oil tank (22), thereby avoiding the problem of excessively high lubricating oil temperature and accelerated oxidation and deterioration of the oil during operation, and preventing the lubricating oil from failing due to temperature rise and shortening its service life.

8. The automatic welding device for the body of a double-walled oil tank according to claim 7, characterized in that, The cooling mechanism includes an air inlet on the rubber sealing frame plate (23) and the lubricating oil tank (22) and a lower air outlet on the lower part of the annular pipe (25). A guide pipe (30) is provided between the air inlet and the lower air outlet. Straight rods are rotatably installed on the outer walls of both sides of the guide pipe (30). The ends of the two straight rods that are close to each other extend into the guide pipe (30) and are fixedly installed with a rubber sealing plate (27). The ends of the two straight rods that are far apart from each other are respectively fixedly fitted with second gears (28). The two second gears (28) respectively mesh with the second toothed plate (29) fixedly installed on the top of the rubber sealing frame plate (23).

9. The automatic welding device for the body of a double-walled oil tank according to claim 8, characterized in that, The air duct (30) consists of an upper rigid pipe and a lower retractable corrugated flexible pipe.

10. The automatic welding device for the body of a double-walled oil tank according to claim 4, characterized in that, The outer wall of the large gear ring (8) is provided with an annular groove, and the outer wall of the moving gear (31) is fixedly fitted with an annular limiting plate (32), and a part of the annular limiting plate (32) is located in the annular groove and is slidably connected to the inner wall of the annular groove.

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