A welding device for the tank wall of a liquid storage tank and its anti-deformation welding method

Abstract

The present invention discloses a welding device for the tank wall of a liquid storage tank and its anti-deformation welding method, including a base, and further including: a support body, with two symmetrically arranged on the base; a first roller and a second roller, with a plurality of them alternately and evenly arranged along the length direction of the support body for directly supporting the tank cylinder; a threaded damping layer is provided on the outer wall of the first roller; a driving component for driving the first roller and the second roller to actively roll; an abutting frame arranged on the base for abutting against the end of the tank cylinder; a laser welding machine. By arranging the first roller and the second roller to support the tank cylinder, making one end of the tank cylinder abut against the abutting frame, and when the driving component drives the first roller and the second roller, double-point balanced welding is achieved. At the same time, the threaded damping layer on the first roller exerts a frictional force axially approaching the abutting frame on the tank cylinder through the action of threaded feeding, keeping the tank cylinder in contact with the abutting frame and preventing the tank cylinder from undergoing uncertain axial movement.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding equipment, and particularly relates to a welding device for the tank wall of a liquid storage tank and an anti-deformation welding method therefor. Background Art

[0002] The manufacture of large storage tanks usually adopts the method of splicing and then welding multiple tank cylinders. Therefore, the quality of the welds is directly related to the airtightness and durability of the storage tanks. Existing tank wall welding devices can basically meet the welding requirements of large cryogenic liquid storage tanks, but there are still some deficiencies that need to be improved.

[0003] Patent document CN113843504A was published on December 28, 2021, and discloses a thin-walled non-rotating tank cylinder automatic welding equipment and method. Its technical solution includes a conveying device, a shaping device, a welding device, a control device, an information acquisition device, and a support device. The conveying device includes a linear track and a support device that can move on it. The support device includes a roller rack for supporting the tank cylinder during installation and shaping, and a mandrel for supporting the shaping device. The tank cylinder to be welded is sleeved outside the shaping device during installation. The welding device includes a plurality of annular rails arranged in the area where the weld is located and a welding head that can move around the annular rails. During the welding process, the control system controls each welding head to move uniformly along its respective annular rail to complete the welding of adjacent tank cylinders. Its beneficial effects are as follows: Only a small amount of manual intervention is required, reducing the labor intensity of workers, reducing the dependence on the experience of welding workers, and the automated operation improves the welding efficiency and welding quality.

[0004] When welding the splicing part of two tank cylinders, there are two methods. One method is to fix the tank cylinder and let the welder operate the welding machine to surround the tank cylinder for welding. Under the premise of keeping the weld in a straight line, this method has high requirements for manual proficiency. The other method is to place the tank cylinder on a structure supported by rollers, and keep the welding machine in a fixed position, and let the tank cylinder rotate synchronously for welding, saving labor. However, during the driving process of the tank cylinder by the rollers, the tank cylinder may have axial movement, which also affects the regularity of the weld and may cause the tank cylinder to deform. Therefore, there is an urgent need for a welding device for the tank wall of a liquid storage tank and an anti-deformation welding method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device for the tank wall of a liquid storage tank and an anti-deformation welding method therefor to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A welding device for the tank wall of a liquid storage tank, including a base, further including: support bodies, two of which are symmetrically arranged on the base and the distance between them is set to be less than the diameter of the tank cylinder; a first roller and a second roller, a plurality of which are alternately and evenly arranged on the support bodies along the length direction of the support bodies for directly supporting the tank cylinder; a threaded damping layer is arranged on the outer wall of the first roller; a driving component for driving the first roller and the second roller to actively roll; a butting frame arranged on the base for butting against the end of the tank cylinder; two laser welding machines are symmetrically installed on the base and the emitting ends are arranged facing the weld on the tank cylinder.

[0008] Preferably, a support is arranged on the support body for connecting the first roller or the second roller.

[0009] Preferably, the driving component includes a driving shaft driven by a servo motor in the support body, the driving shaft is in transmission connection with a first transmission shaft, the first transmission shaft is in transmission connection with a second transmission shaft rotatably arranged on the support, and the second transmission shaft is in transmission connection with the rotating shaft of the first roller or the second roller.

[0010] Preferably, the support is rotatably arranged so that the first roller and the second roller have a first state with the axis parallel to the axis of the tank cylinder and a second state with the axis perpendicular to the axis of the tank cylinder.

[0011] Preferably, a linkage component is arranged in the support body, and the linkage component is used for driving the support connected to the first roller to perform a reciprocating lifting movement during the switching process of the first roller between the first state and the second state.

[0012] Preferably, a rotating sleeve is rotatably connected to the support body, one end of the rotating sleeve is fixedly connected to the support, a switching gear is synchronously rotated at the other end of the rotating sleeve, a switching rack meshed with the switching gear is movably arranged in the support body, and the switching rack is driven by a telescopic driving unit arranged in the support body.

[0013] Preferably, the linkage component includes a first bevel gear synchronously rotated on the outer wall of the rotating sleeve, a second bevel gear meshed with the first bevel gear is rotatably arranged in the support body, a synchronous ring is rotatably sleeved on the outer wall of the rotating sleeve, an eccentric rod is arranged on the end face of the second bevel gear close to the rotating sleeve, and a linkage sleeve slidably sleeved with the eccentric rod is arranged on the outer wall of the synchronous ring.

[0014] Preferably, a plurality of third rollers are evenly arranged on the part of the support body far from the butting frame, and the third rollers are arranged following the switching of the axial states of the first roller and the second roller.

[0015] Preferably, a slide rail is arranged on the base, a sliding seat slidably connected to the slide rail is arranged at the lower end of the butting frame, and a push-pull driving unit for driving the butting frame to move is fixedly installed on the base.

[0016] A deformation-proof welding method is based on the above-mentioned tank wall welding device for a liquid storage tank, comprising: placing two initially docked tank barrels between the two supports with their axes parallel to the length direction of the supports, and supported by a first roller and a second roller, an abutment frame abutting one end of the tank barrel so that the weld on the tank barrel faces the transmitting ends of laser welding machines on both sides, then a driving assembly drives the first roller and the second roller to roll, and the tank barrel rolls accordingly so that the weld rolls through the laser welding machine, and at the same time, the threaded damping layer on the first roller applies an axial friction force to the tank barrel approaching the abutment frame through the threaded feeding action, thereby keeping the tank barrel in contact with the abutment frame and preventing the tank barrel from having uncertain axial movement.

[0017] In the above technical solution, the beneficial effects of the present invention are:

[0018] The tank wall welding device of the liquid storage tank supports the tank barrel by arranging the first roller and the second roller, and at the same time, allows one end of the tank barrel to abut against the abutment frame. Then, when the driving component drives the first roller and the second roller, on the one hand, the tank barrel rolls accordingly to make the weld roll through the laser welding machines on both sides to achieve double-point balanced welding. At the same time, the threaded damping layer on the first roller applies axial friction force to the tank barrel close to the abutment frame through the thread feeding action, keeps the tank barrel against the abutment frame, prevents the tank barrel from having uncertain axial movement, thereby ensuring the regularity of the weld and greatly reducing the possibility of deformation of the tank barrel.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0020] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a local structure when the canister provided by an embodiment of the present invention is not placed;

[0024] Figure 3 A schematic diagram of the internal structure of a support body provided by an embodiment of the present invention;

[0025] Figure 4 The embodiment of the present invention providesFigure 3 Schematic diagram of the enlarged structure at A in the [specific object];

[0026] Figure 5 Schematic diagram of the second bevel gear and synchronizing ring provided by the embodiment of the present invention;

[0027] Figure 6 Front view sectional structure schematic diagram provided by the embodiment of the present invention;

[0028] Figure 7 Provided by the embodiment of the present invention Figure 6 Schematic diagram of the enlarged structure at B in the [specific object].

[0029] Explanation of reference numerals:

[0030] 1. Base; 2. Support body; 3. First roller; 4. Second roller; 5. Threaded damping layer; 6. Contact frame; 7. Laser welding machine; 8. Support; 9. Drive shaft; 10. First transmission shaft; 11. Second transmission shaft; 12. Rotating sleeve; 13. Switching gear; 14. Switching rack; 15. Telescopic drive unit; 16. First bevel gear; 17. Second bevel gear; 18. Synchronizing ring; 19. Eccentric rod; 20. Linking sleeve; 21. Third roller; 22. Slide rail; 23. Slide seat; 24. Push-pull drive unit. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0032] Please refer to Figures 1-7 , a tank wall welding device for a liquid storage tank provided by an embodiment of the present invention, includes a support body 2, which is symmetrically arranged in two on a base 1 and has a spacing less than the diameter of the tank cylinder; a first roller 3 and a second roller 4, which are alternately and evenly arranged in a plurality along the length direction of the support body 2 for directly supporting the tank cylinder; a threaded damping layer 5 is arranged on the outer wall of the first roller 3; a driving assembly for driving the first roller 3 and the second roller 4 to actively roll; a contact frame 6 arranged on the base 1 for contacting the end of the tank cylinder; and two laser welding machines 7 are symmetrically installed on the base 1 and the emission ends are directed at the weld seams on the tank cylinder.

[0033] Specifically, the supporting bodies 2 are convexly arranged on the upper surface of the base 1, and the two supporting bodies 2 are arranged symmetrically and parallel to each other; the height of the supporting bodies 2 is such that the tank cylinder can be lifted without contacting the base 1; the first roller 3 and the second roller 4 have the same specifications, and only a threaded damping layer 5 is provided on the outer wall of the first roller 3; the active rolling directions of the first roller 3 and the second roller 4 are the same, and the first rollers 3 and the second rollers 4 on the two supporting bodies 2 are also both set to have the same active rolling direction; preferably, on the same supporting body 2, two first rollers 3 and two second rollers 4 are both provided, and they are alternately and equidistantly arranged along the length direction of the supporting body 2; the interval between the rollers is set to be less than the length of one tank cylinder; when the threaded damping layer 5 rotates with the first roller 3, a frictional component force in the axial direction of the tank cylinder is generated on the outer wall of the tank cylinder, and this frictional component force points in the direction of the abutting frame 6; the driving assembly drives the rollers to roll, and the rolling directions of the rollers are the same and synchronous; the abutting frame 6 is arranged above one end of the supporting body 2, and the abutting surface is arranged parallel to the end plane of the tank cylinder; the emitting end of the laser welding machine 7 is horizontally facing the weld on the side wall of the tank cylinder, and at the same time, it also corresponds to the position where the horizontal width of the side wall of the tank cylinder is the largest. The two laser welding machines 7 weld the two sides of the tank cylinder synchronously, and then, under the rotation of the tank cylinder, the weld is continuously welded to form a double-point balanced welding, preventing the deformation of the tank cylinder caused by stress imbalance. In the actual use of this technical solution, the two preliminarily butted tank cylinders are placed axially parallel to the length direction of the supporting bodies 2 between the two supporting bodies 2 and are supported by the first rollers 3 and the second rollers 4. At the same time, one end of the tank cylinder abuts against the abutting frame 6. Then, when the driving assembly drives the first roller 3 and the second roller 4, on the one hand, the tank cylinder rolls along with it so that the weld rolls past the two side laser welding machines 7, and the two side laser welding machines 7 work simultaneously to achieve double-point balanced welding. At the same time, the threaded damping layer 5 on the first roller 3 exerts a frictional force on the tank cylinder in the axial direction close to the abutting frame 6 through the threaded feeding action, keeping the tank cylinder in contact with the abutting frame 6 and preventing the tank cylinder from having uncertain axial movement, thereby ensuring the regularity of the weld and greatly reducing the possibility of deformation of the tank cylinder.

[0034] Compared with the prior art, the tank wall welding device for a liquid storage tank proposed in the embodiment of the present invention supports the tank cylinder by setting the first roller 3 and the second roller 4. At the same time, one end of the tank cylinder abuts against the abutting frame 6. Then, when the driving assembly drives the first roller 3 and the second roller 4, on the one hand, the tank cylinder rolls along with it so that the weld rolls past the two side laser welding machines 7 to achieve double-point balanced welding. At the same time, the threaded damping layer 5 on the first roller 3 exerts a frictional force on the tank cylinder in the axial direction close to the abutting frame 6 through the threaded feeding action, keeping the tank cylinder in contact with the abutting frame 6 and preventing the tank cylinder from having uncertain axial movement, thereby ensuring the regularity of the weld and greatly reducing the possibility of deformation of the tank cylinder.

[0035] As a preferred technical solution of this embodiment, a support 8 for connecting the first roller 3 or the second roller 4 is provided on the support body 2. Specifically, the support 8 is in a "C" shape, and the first roller 3 or the second roller 4 is rotatably connected between the end structures of the support 8 to be supported.

[0036] As a preferred technical solution of this embodiment, the drive assembly includes a drive shaft 9 driven by a servo motor inside the support body 2. The drive shaft 9 is drivingly connected to a first transmission shaft 10. The first transmission shaft 10 is drivingly connected to a second transmission shaft 11 rotatably arranged on the support 8. The second transmission shaft 11 is drivingly connected to the rotating shaft of the first roller 3 or the second roller 4. Specifically, the axial direction of the drive shaft 9 is arranged along the length direction of the support body 2; a third bevel gear is coaxially connected to the drive shaft 9; the axial direction of the first transmission shaft 10 is perpendicular to the axial direction of the drive shaft 9 and is arranged along the radial direction of the tank cylinder; a fourth bevel gear meshing with the third bevel gear is coaxially connected to one end of the first transmission shaft 10, and the other end is rotatably connected to the support 8 and coaxially connected to a fifth bevel gear; the axial direction of the second transmission shaft 11 is parallel to the axial direction of the roller, and a sixth bevel gear meshing with the fifth bevel gear is coaxially connected to one end, and a first transmission gear is coaxially connected to the other end. One end of the rotating shaft of the roller is coaxially connected to a second transmission gear, and a third transmission gear rotatably arranged on the support 8 is meshingly connected between the first transmission gear and the second transmission gear; in actual use, the drive shaft 9 is driven by the servo motor to rotate, and then the first transmission shaft 10 is driven through the third bevel gear and the fourth bevel gear. The first transmission shaft 10 then drives the second transmission shaft 11 through the fifth bevel gear and the sixth bevel gear. Finally, the second transmission shaft 11 drives the first roller 3 or the second roller 4 to roll through the first transmission gear, the third transmission gear and the second transmission gear in sequence.

[0037] In another embodiment proposed by the present invention, the support 8 is rotatably arranged, so that the first roller 3 and the second roller 4 have a first state in which the axis is parallel to the axis of the tank cylinder and a second state in which the axis is perpendicular to the axis of the tank cylinder. Specifically, when the first roller 3 and the second roller 4 are in the first state, that is, the axis is parallel to the axis of the tank cylinder. At this time, the rolling of the first roller 3 and the second roller 4 drives the tank cylinder to rotate self. When the first roller 3 and the second roller 4 are in the second state, that is, the axis is perpendicular to the axis of the tank cylinder. At this time, the rolling of the first roller 3 and the second roller 4 drives the tank cylinder to move axially, which can be used to move the tank cylinder on the base 1 after two sections of the tank cylinder are welded to create space for placing the next section of the welded tank cylinder near the abutment frame 6, eliminating the need to use hoisting equipment to move the welded tank cylinder and facilitating the welding work of multiple sections of the tank cylinder.

[0038] As a preferred technical solution of this embodiment, a linkage assembly is provided inside the support body 2. The linkage assembly is used to drive the support 8 connected to the first roller 3 to perform reciprocating lifting motion during the switching process between the first state and the second state of the first roller 3. Specifically, a threaded damping layer 5 is provided on the outer wall of the first roller 3. When the first roller 3 switches between the first state and the second state, it will rotate relative to the outer wall of the canister in close contact, which is likely to damage the threaded damping layer 5. To solve this problem, the support 8 connected to the first roller 3 is arranged to perform reciprocating lifting motion during the switching process between the first state and the second state of the first roller 3, thereby preventing the threaded damping layer 5 from contacting the outer wall of the canister during this period, protecting the threaded damping layer 5 and increasing its service life.

[0039] As a preferred technical solution of this embodiment, a rotating sleeve 12 is rotatably connected to the support body 2. One end of the rotating sleeve 12 is fixedly connected to the support 8, and a switching gear 13 is synchronously rotated at the other end of the rotating sleeve 12. A switching rack 14 meshing with the switching gear 13 is movably arranged inside the support body 2. The switching rack 14 is driven by a telescopic driving unit 15 arranged inside the support body 2. Specifically, in the structure corresponding to the first roller 3: the first transmission shaft 10 can axially move relative to the rotating sleeve 12, and the fifth bevel gear is connected to the end of the first transmission shaft 10 through a key block and a key slot. While ensuring synchronous rotation of the two, the first transmission shaft 10 can also axially move relative to the fifth bevel gear; the switching gear 13 is coaxially connected to the rotating sleeve 12 through another set of key blocks and key slots. The switching gear 13 is fixed in position inside the support body 2 and remains meshed with the switching rack 14 without affecting the axial movement of the rotating sleeve 12. In the structure corresponding to the second roller 4: the first transmission shaft 10 is axially relatively fixed to the rotating sleeve 12, and the fifth bevel gear is coaxially and fixedly connected to the first transmission shaft 10; the switching gear 13 is coaxially and fixedly connected to the rotating sleeve 12. The length extension direction and the moving direction of the switching rack 14 are both arranged parallel to the length direction of the support body 2; the telescopic driving unit 15 can preferably be a hydraulic telescopic cylinder. In actual use of this technical solution, the telescopic driving unit 15 drives the switching rack 14 to move, the switching rack 14 meshes and drives each switching gear 13 to rotate, and the switching gear 13 can drive the rotating sleeve 12 to rotate. The rotating sleeve 12 then drives the support 8 to rotate to switch the first roller 3 and the second roller 4 to the first state or the second state.

[0040] As a preferred technical solution of this embodiment, the linkage assembly includes a first bevel gear 16 rotatably provided on the outer wall of the rotating sleeve 12 synchronously. A second bevel gear 17 meshing with the first bevel gear 16 is rotatably provided in the support body 2. A synchronizing ring 18 is rotatably sleeved on the outer wall of the rotating sleeve 12. An eccentric rod 19 is provided on the end face of the second bevel gear 17 close to the rotating sleeve 12. A linkage sleeve 20 slidably sleeved with the eccentric rod 19 is provided on the outer wall of the synchronizing ring 18. Specifically, the first bevel gear 16 is only provided on the rotating sleeve 12 corresponding to the first roller 3. Preferably, the first bevel gear 16 is coaxially and fixedly connected to the switching gear 13 provided on the rotating sleeve 12 corresponding to the first roller 3, so that it can rotate synchronously with the rotating sleeve 12 without affecting the axial movement of the rotating sleeve 12. The axis of the second bevel gear 17 is vertically and intersectingly arranged with the axis of the rotating sleeve 12. The rotating sleeve 12 is provided with convex rings limiting both sides of the synchronizing ring 18, so that the synchronizing ring 18 moves axially synchronously with the rotating sleeve 12, and the two can perform free relative axial rotation. The eccentric rod 19 performs a circular motion along with the second bevel gear 17. The relative movement direction of the eccentric rod 19 in the linkage sleeve 20 is perpendicular to the axial movement direction of the rotating sleeve 12. Therefore, when the eccentric rod 19 performs a circular motion, the eccentric rod 19 performs a relative reciprocating movement in the linkage sleeve 20 on one side, and drives the synchronizing ring 18 to perform an axial reciprocating movement through the linkage sleeve 20 on the other side, that is, drives the rotating sleeve 12 to perform an axial reciprocating movement. Further, the rotating sleeve 12 drives the support 8 to rotate, so that within the rotation range of the first roller 3 switching between the first state and the second state, the second bevel gear 17 just rotates one week, which correspondingly corresponds to the rotating sleeve 12 completing one reciprocating lift. Further still, before and after the first roller 3 switches between the first state and the second state, the first roller 3 returns to the height of supporting the tank barrel, and is lower than the height of supporting the tank barrel during the switching process, thereby protecting the threaded damping layer 5.

[0041] As a preferred technical solution of this embodiment, a plurality of third rollers 21 are evenly provided on the part of the support body 2 far from the abutting frame 6. The third rollers 21 are arranged according to the switching of the axial states of the first roller 3 and the second roller 4. Specifically, the axial state switching function of the third rollers 21 is the same as that of the first roller 3 and the second roller 4, and the triggering structures are the same, and the triggering states are synchronized under the control of the servo system, which will not be elaborated. The setting of the third rollers 21 is used to assist the movement of the welded tank barrel and the subsequent self-rotation of the welded tank barrel.

[0042] As the preferred technical solution of this embodiment, a slide rail 22 is provided on the base 1, and a slide seat 23 slidably connected to the slide rail 22 is provided at the lower end of the abutment frame 6. A push-pull drive unit 24 for driving the abutment frame 6 to move is fixedly installed on the base 1. Specifically, the setting of the slide rail 22 and the slide seat 23 enables the abutment frame 6 to move along the length direction of the support body 2; the push-pull drive unit 24 can preferably be a hydraulic cylinder, one end of which is hinged on the base 1, and the other end is set as an output end and hinged to the abutment frame 6. The push-pull drive unit 24 can control the movement of the abutment frame 6 by telescoping the output end, which is convenient for controlling the position of the abutment frame 6, and also convenient for finding the abutment position of the can barrel, which is used to adjust the weld on the can barrel to correspond to the transmitting end of the laser welding machine 7.

[0043] A deformation-proof welding method is based on the above-mentioned tank wall welding device for a liquid storage tank, comprising: placing two initially docked tank barrels between the two support bodies 2 with their axes parallel to the length direction of the support body 2, and supported by a first roller 3 and a second roller 4, an abutment frame 6 abutting one end of the tank barrel so that the weld on the tank barrel faces the emission ends of laser welding machines 7 on both sides, then, a driving assembly drives the first roller 3 and the second roller 4 to roll, and the tank barrel rolls accordingly so that the weld rolls through the laser welding machine 7, and at the same time, the threaded damping layer 5 on the first roller 3 applies an axial friction force to the tank barrel close to the abutment frame 6 through the threaded feeding action, thereby keeping the tank barrel in contact with the abutment frame 6 and preventing the tank barrel from having uncertain axial movement.

[0044] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A tank wall welding device for a liquid storage tank, comprising a base (1), characterized in that: Also includes: Two support bodies (2) are symmetrically arranged on the base (1) and the spacing between them is smaller than the diameter of the can barrel; A plurality of first rollers (3) and second rollers (4) are alternately and evenly arranged on the support body (2) along the length direction of the support body (2) and are used to directly support the can barrel; a threaded damping layer (5) is arranged on the outer wall of the first roller (3); A driving assembly, used for driving the first roller (3) and the second roller (4) to actively roll; An abutment frame (6) disposed on the base (1) and used for abutting against the end of the can; Two laser welding machines (7) are symmetrically mounted on the base (1), and the emission ends are arranged facing the weld seam on the tank barrel; The support body (2) is provided with a support (8) connected to the first roller (3) or the second roller (4); The support (8) is rotatably arranged so that the first roller (3) and the second roller (4) have a first state in which the axes are parallel to the axes of the can barrel and a second state in which the axes are perpendicular to the axes of the can barrel; in the first state, the first roller (3) and the second roller (4) have axes parallel to the axes of the can barrel, driving the can barrel to rotate; in the second state, the first roller (3) and the second roller (4) have axes perpendicular to the axes of the can barrel, driving the can barrel to move axially; A linkage component is provided in the support body (2), and is used to link a support (8) connected to the first roller (3) to reciprocating lifting and lowering motion during the switching process of the first roller (3) between the first state and the second state.

2. The tank wall welding device of the liquid storage tank according to claim 1 is characterized in that: The driving assembly comprises a driving shaft (9) driven by a servo motor in a supporting body (2); the driving shaft (9) is drivingly connected to a first transmission shaft (10); the first transmission shaft (10) is drivingly connected to a second transmission shaft (11) rotatably arranged on a support (8); the second transmission shaft (11) is drivingly connected to a rotating shaft of the first roller (3) or the second roller (4).

3. The tank wall welding device of the liquid storage tank according to claim 1 is characterized in that: A rotary sleeve (12) is rotatably connected to the support body (2), one end of the rotary sleeve (12) is fixedly connected to the support (8), the other end of the rotary sleeve (12) is synchronously rotatably provided with a switching gear (13), a switching rack (14) meshingly connected to the switching gear (13) is movably provided in the support body (2), and the switching rack (14) is driven by a telescopic driving unit (15) provided in the support body (2).

4. The tank wall welding device for a liquid storage tank according to claim 3, characterized in that: The linkage assembly comprises a first bevel gear (16) synchronously rotatably arranged on the outer wall of a rotary sleeve (12), a second bevel gear (17) rotatably arranged in the support body (2) and meshing with the first bevel gear (16), a synchronizing ring (18) rotatably sleeved on the outer wall of the rotary sleeve (12), an eccentric rod (19) being arranged on the end surface of the second bevel gear (17) close to the rotary sleeve (12), and a linkage sleeve (20) slidably sleeved on the outer wall of the synchronizing ring (18) being arranged.

5. The tank wall welding device for a liquid storage tank according to claim 1, characterized in that: A plurality of third rollers (21) are evenly arranged on a portion of the support body (2) away from the abutment frame (6), and the third rollers (21) are arranged to switch axial states with the first roller (3) and the second roller (4).

6. The tank wall welding device for a liquid storage tank according to claim 1, characterized in that: The base (1) is provided with a slide rail (22), the lower end of the abutment frame (6) is provided with a slide seat (23) slidably connected to the slide rail (22), and a push-pull drive unit (24) for driving the abutment frame (6) to move is fixedly mounted on the base (1).

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