Tank wall welding device of liquid storage tank and anti-deformation welding method of tank wall welding device

Abstract

The invention discloses a tank wall welding device for a liquid storage tank and an anti-deformation welding method thereof.The tank wall welding device comprises a base and further comprises two supporting bodies symmetrically arranged on the base; the multiple first rollers and the multiple second rollers are alternately and evenly arranged on the supporting body in the length direction of the supporting body and used for directly supporting the tank barrel; a threaded damping layer is arranged on the outer wall of the first roller; the driving assembly is used for driving the first roller and the second roller to roll actively; the abutting frame is arranged on the base and used for abutting against the end of the tank barrel; provided is a laser welding machine. The first roller and the second roller are arranged to support the tank barrel, one end of the tank barrel abuts against the abutting frame, when the driving assembly drives the first roller and the second roller, double-point balance welding is achieved, meanwhile, the thread damping layer on the first roller exerts friction force axially close to the abutting frame on the tank barrel through the thread feeding effect, and therefore the tank barrel can be stably welded. The tank barrel is kept abutting against the abutting frame, and uncertain axial movement of the tank barrel is prevented.

Description

Technical Field

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

[0002] The manufacturing of large storage tanks usually adopts the method of splicing and welding multiple tank sections. Therefore, the quality of the weld is directly related to the airtightness and durability of the tank. The existing tank wall welding equipment can basically meet the welding requirements of large ultra-low temperature liquid storage tanks, but there are still some shortcomings that need to be improved.

[0003] Patent document CN113843504A disclosed a thin-walled non-rotating tank barrel automatic welding equipment and method on the announcement date of December 28, 2021. Its technical solution includes a conveying device, a shaping device, a welding device, a control device, an information collection device and a supporting device. The conveying device includes a linear track and a supporting device that can move thereon. The supporting device includes a roller frame for supporting the tank barrel during installation and shaping, and a mandrel for supporting the shaping device. The tank barrel to be welded is sleeved on the outside of the shaping device during installation. The welding device includes a plurality of annular guide rails arranged in the area where the weld is located and a welding head that can move around the annular guide rails. During the welding process, the control system controls each welding head to move at a uniform speed along its own annular guide rail to complete the welding of adjacent tank barrels. Its beneficial effects are: only a small amount of manual intervention is required, which reduces the labor intensity of workers and reduces the dependence on the experience of welding workers. Automated operations improve welding efficiency and welding quality.

[0004] There are two ways to weld the joints of two tank barrels. One way is to fix the tank barrel and let the welding machine be manually operated to weld around the tank barrel. This method requires high manual proficiency while keeping the weld straight. The other way is to place the tank barrel on a roller-supported structure and keep the welding machine in a fixed position so that the tank barrel rotates and welds synchronously, saving labor. However, during the driving process of the roller on the tank barrel, the tank barrel may have axial movement, which also affects the regularity of the weld and may cause the tank barrel to deform. Therefore, a tank wall welding device for a liquid storage tank and an anti-deformation welding method thereof are urgently needed to solve the above problems. Summary of the invention

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

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A tank wall welding device for a liquid storage tank includes a base and also includes: a support body, two of which are symmetrically arranged on the base and the spacing is smaller than the diameter of the tank barrel; a first roller and a second roller, a plurality of which are alternately and evenly arranged on the support body along the length direction of the support body, for directly supporting the tank barrel; a threaded damping layer is arranged on the outer wall of the first roller; a driving component, which is used to drive the first roller and the second roller to actively roll; an abutment frame, which is arranged on the base and is used to abut the end of the tank barrel; and a laser welding machine, which is symmetrically installed on the base, and the emission end is arranged directly opposite to the weld on the tank barrel.

[0007] Preferably, a support connected to the first roller or the second roller is provided on the support body.

[0008] Preferably, the driving assembly includes a driving shaft driven by a servo motor in the support body, the driving shaft is transmission-connected to a first transmission shaft, the first transmission shaft is transmission-connected to a second transmission shaft rotatably arranged on a support, and the second transmission shaft is transmission-connected to a rotating shaft of the first roller or the second roller.

[0009] Preferably, the support is rotatably arranged so that the first roller and the second roller have a first state in which the axis is parallel to the axis of the can barrel and a second state in which the axis is perpendicular to the axis of the can barrel.

[0010] Preferably, a linkage component is provided in the support body, and the linkage component is used to link the support connected to the first roller to perform reciprocating lifting and lowering motion during the switching of the first roller between the first state and the second state.

[0011] Preferably, a rotary sleeve is rotatably connected to the support body, one end of the rotary sleeve is fixedly connected to the support, and a switching gear is synchronously rotated at the other end of the rotary sleeve. A switching rack meshing with the switching gear is movably provided in the support body, and the switching rack is driven by a telescopic driving unit provided in the support body.

[0012] Preferably, the linkage assembly includes a first bevel gear synchronously rotated on the outer wall of the rotating sleeve, a second bevel gear rotatably arranged in the support body and meshing with the first bevel gear, 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 on the outer wall of the synchronous ring is arranged.

[0013] Preferably, a plurality of third rollers are evenly arranged on a portion of the support body away from the abutment frame, and the third rollers are arranged to switch axial states with the first roller and the second roller.

[0014] Preferably, a slide rail is provided on the base, a slide seat slidably connected to the slide rail is provided at the lower end of the abutment frame, and a push-pull driving unit for driving the abutment frame to move is fixedly mounted on the base.

[0015] 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. In the above technical solution, the beneficial effects of the present invention are: 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.

[0016] 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.

[0017] 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

[0018] 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.

[0019] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of a local structure when the canister provided by an embodiment of the present invention is not placed; Figure 3 A schematic diagram of the internal structure of a support body provided by an embodiment of the present invention; Figure 4 The embodiment of the present invention provides Figure 3 A schematic diagram of the enlarged structure at A in the middle; Figure 5A schematic diagram of the structure of a second bevel gear and a synchronizer ring provided in an embodiment of the present invention; Figure 6 A schematic diagram of a front cross-sectional structure provided by an embodiment of the present invention; Figure 7 The embodiment of the present invention provides Figure 6 Schematic diagram of the enlarged structure at point B in the middle.

[0020] Description of reference numerals: 1. Base; 2. Support body; 3. First roller; 4. Second roller; 5. Threaded damping layer; 6. Abutment frame; 7. Laser welding machine; 8. Support; 9. Drive shaft; 10. First transmission shaft; 11. Second transmission shaft; 12. Rotary sleeve; 13. Switching gear; 14. Switching rack; 15. Telescopic drive unit; 16. First bevel gear; 17. Second bevel gear; 18. Synchronous ring; 19. Eccentric rod; 20. Linkage sleeve; 21. Third roller; 22. Slide rail; 23. Slide seat; 24. Push-pull drive unit. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure. See also Figure 1-7 A tank wall welding device for a liquid storage tank provided by an embodiment of the present invention comprises a support body 2, two of which are symmetrically arranged on a base 1, and the spacing is smaller than the diameter of the tank barrel; a first roller 3 and a second roller 4, a plurality of which are alternately and evenly arranged on the support body 2 along the length direction of the support body 2, for directly supporting the tank barrel; a threaded damping layer 5 is arranged on the outer wall of the first roller 3; a driving component, which is used to drive the first roller 3 and the second roller 4 to actively roll; an abutment frame 6, which is arranged on the base 1 and is used to abut the end of the tank barrel; a laser welding machine 7, two of which are symmetrically installed on the base 1, and the emission end is arranged facing the weld on the tank barrel.

[0022] Specifically, the support body 2 is protruded and arranged on the upper surface of the base 1, and the two support bodies 2 are arranged parallel and symmetrically to each other; the height of the support body 2 is sufficient to support the can without touching the base 1; the first roller 3 and the second roller 4 are consistent in specifications, and only the threaded damping layer 5 is arranged on the outer wall of the first roller 3; the active rolling direction of the first roller 3 and the second roller 4 are consistent, and the first roller 3 and the second roller 4 on the two support bodies 2 are also arranged in the same active rolling direction; preferably, on the same support body 2, two first rollers 3 and two second rollers 4 are arranged, and they are arranged alternately and equidistantly along the length direction of the support body 2; the interval between the rollers is less than the length of a can; the threaded damping layer As the first roller 3 rotates, a friction force component in the axial direction of the barrel is generated on the outer wall of the barrel, and the friction force component points to the direction of the abutment frame 6; the driving assembly drives the roller to roll, and the roller rolls in the same and synchronous direction; the abutment frame 6 is arranged above one end of the support body 2, and the abutment surface is arranged parallel to the end plane of the barrel; the emission end of the laser welding machine 7 is horizontally facing the weld of the barrel side wall, and also corresponds to the position where the horizontal width of the barrel side wall is the largest. The two laser welding machines 7 weld the two sides of the barrel synchronously, and then continuously weld the weld under the self-rotation of the barrel to form a double-point balanced welding to prevent the barrel from being deformed due to stress imbalance. In actual use of this technical solution, the two initially connected cans are placed between the two support bodies 2 with their axial directions parallel to the length direction of the support body 2, and supported by the first roller 3 and the second roller 4. At the same time, one end of the can is abutted against the abutment frame 6. Then, when the driving assembly drives the first roller 3 and the second roller 4, on the one hand, the can rolls accordingly to make the weld roll through the laser welding machines 7 on both sides. The laser welding machines 7 on both sides work simultaneously to achieve double-point balanced welding. At the same time, the threaded damping layer 5 on the first roller 3 applies an axial friction force to the can close to the abutment frame 6 through the threaded feeding action, which keeps the can against the abutment frame 6 and prevents the can from having uncertain axial movement, thereby ensuring the regularity of the weld and greatly reducing the possibility of deformation of the can.

[0023] Compared with the prior art, a tank wall welding device for a liquid storage tank proposed in an embodiment of the present invention supports the tank barrel by arranging a first roller 3 and a second roller 4, and at the same time, allows one end of the tank barrel to abut against an abutment frame 6. Then, when the driving assembly drives the first roller 3 and the second roller 4, on the one hand, the tank barrel rolls accordingly to make the weld roll through the laser welding machines 7 on both sides to achieve double-point balanced welding. 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 thread feeding action, thereby keeping the tank barrel in contact with the abutment frame 6 and preventing 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.

[0024] 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.

[0025] As a preferred technical solution of this embodiment, the driving assembly includes a driving shaft 9 driven by a servo motor inside the support 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 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 driving shaft 9 is arranged along the length direction of the support body 2; a third bevel gear is coaxially connected to the driving shaft 9; the axial direction of the first transmission shaft 10 is perpendicular to the axial direction of the driving 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. A second transmission gear is coaxially connected to one end of the rotating shaft of the roller. 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 driving shaft 9 is driven by the servo motor to rotate, and then the first transmission shaft 10 is driven by 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.

[0026] 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 axial direction is parallel to the axial direction of the tank cylinder and a second state in which the axial direction is perpendicular to the axial direction of the tank cylinder. Specifically, when the first roller 3 and the second roller 4 are in the first state, that is, the axial direction is parallel to the axial direction 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 axial direction is perpendicular to the axial direction 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 make room for placing the next section of the welded tank cylinder near the abutting frame 6, eliminating the need to use a hoisting device to move the welded tank cylinder and facilitating the welding work of multiple sections of the tank cylinder.

[0027] As a preferred technical solution of this embodiment, a linkage component is arranged in the support body 2, and the linkage component is used to link the 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. Specifically, the threaded damping layer 5 arranged on the outer wall of the first roller 3 will rotate relatively with the outer wall of the tank barrel in close contact when the first roller 3 switches between the first state and the second state, which can easily damage the threaded damping layer 5. To address this problem, the support 8 connected to the first roller 3 is arranged to reciprocate and lift during the switching process of the first roller 3 between the first state and the second state, thereby preventing the threaded damping layer 5 from contacting the outer wall of the tank barrel during this period, protecting the threaded damping layer 5 and improving the service life.

[0028] As the preferred technical scheme of this embodiment, 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, and a switching gear 13 is arranged on the other end of the rotary sleeve 12 for synchronous rotation. A switching rack 14 meshing with the switching gear 13 is movably arranged in the support body 2, and the switching rack 14 is driven by a telescopic driving unit 15 arranged in the support body 2. Specifically, in the structure corresponding to the first roller 3: the first transmission shaft 10 can move axially relative to the rotary 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 groove, thereby ensuring that the two rotate synchronously, and the first transmission shaft 10 can also move axially relative to the fifth bevel gear; the switching gear 13 is coaxially connected to the rotary sleeve 12 through another set of key blocks and key grooves, and the switching gear 13 is fixed in relative position in the support body 2 and maintains meshing with the switching rack 14, and does not affect the axial movement of the rotary sleeve 12. In the structure corresponding to the second roller 4: the first transmission shaft 10 and the rotary sleeve 12 are relatively fixed axially, the fifth bevel gear is coaxially fixedly connected to the first transmission shaft 10; the switching gear 13 is coaxially fixedly connected to the rotary sleeve 12. The length extension direction and the movement direction of the switching rack 14 are both arranged parallel to the length direction of the support body 2; the telescopic drive unit 15 can preferably be a hydraulic telescopic cylinder. In actual use of this technical solution, the telescopic drive unit 15 drives the switching rack 14 to move, and the switching rack 14 meshes and drives each switching gear 13 to rotate, and the switching gear 13 can drive the rotary sleeve 12 to rotate, and the rotary sleeve 12 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.

[0029] As the preferred technical scheme of this embodiment, the linkage assembly includes a first bevel gear 16 which is synchronously rotated and arranged on the outer wall of the rotary sleeve 12, a second bevel gear 17 which is rotatably arranged in the support body 2 and meshes with the first bevel gear 16, a synchronous ring 18 is rotatably sleeved on the outer wall of the rotary sleeve 12, an eccentric rod 19 is arranged on the end face of the second bevel gear 17 close to the rotary sleeve 12, and a linkage sleeve 20 which is slidably sleeved with the eccentric rod 19 is arranged on the outer wall of the synchronous ring 18. Specifically, the first bevel gear 16 is only arranged on the rotary sleeve 12 corresponding to the first roller 3; preferably, the first bevel gear 16 is coaxially fixedly connected with the switching gear 13 arranged on the rotary sleeve 12 corresponding to the first roller 3, thereby being synchronously rotated with the rotary sleeve 12 without affecting the axial movement of the rotary sleeve 12; the axial direction of the second bevel gear 17 is arranged to intersect perpendicularly with the axial direction of the rotary sleeve 12; a convex ring limited on both sides of the synchronous ring 18 is arranged on the rotary sleeve 12, thereby making the synchronous ring 18 move axially synchronously with the rotary sleeve 12, and the two The eccentric rod 19 can freely rotate relative to the axial direction; the eccentric rod 19 moves in a circular motion with the second bevel gear 17, and the relative movement direction of the eccentric rod 19 in the linkage sleeve 20 is arranged perpendicular to the axial movement direction of the rotary sleeve 12. Therefore, when the eccentric rod 19 moves in a circular motion, the eccentric rod 19 moves relatively back and forth in the linkage sleeve 20 on one side, and drives the synchronous ring 18 to move axially back and forth through the linkage sleeve 20 on the other side, that is, drives the rotary sleeve 12 to move axially back and forth; further, the rotary sleeve 12 drives the support 8 to rotate, so that the first roller 3 rotates exactly one circle within the rotation range of switching between the first state and the second state, and the rotary sleeve 12 completes a reciprocating lifting and lowering correspondingly. Further, 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 the supporting barrel, and is lower than the height of the supporting barrel during the switching process, thereby protecting the threaded damping layer 5.

[0030] As a preferred technical solution of this embodiment, a plurality of third rollers 21 are evenly arranged on the portion of the support body 2 away from the abutment frame 6. The third roller 21 is set to switch the axial state with the first roller 3 and the second roller 4. Specifically, the axial state switching function of the third roller 21 is consistent with the function of the first roller 3 and the second roller 4, and the trigger structure is consistent. The trigger state is synchronized under the control of the servo system, which will not be elaborated. The third roller 21 is set to assist the movement of the welded can barrel and assist the subsequent rotation of the welded can barrel.

[0031] 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.

[0032] 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. 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 welding seam on the tank barrel.

2. The tank wall welding device of the liquid storage tank according to claim 1 is characterized in that: The support body (2) is provided with a support (8) connected to the first roller (3) or the second roller (4).

3. The tank wall welding device of the liquid storage tank according to claim 2 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).

4. The tank wall welding device for a liquid storage tank according to claim 2, characterized in that: 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.

5. The tank wall welding device for a liquid storage tank according to claim 4, characterized in that: 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.

6. The tank wall welding device for a liquid storage tank according to claim 5, 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).

7. The tank wall welding device for a liquid storage tank according to claim 6, 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.

8. 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).

9. 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).

10. A deformation-proof welding method, based on the tank wall welding device of a liquid storage tank according to any one of claims 1 to 9, characterized in that: include: The two initially butted can barrels are placed between the two support bodies (2) with their axes parallel to the length direction of the support body (2) and supported by the first roller (3) and the second roller (4). The abutment frame (6) abuts against one end of the can barrel so that the weld on the can barrel faces the emission ends of the laser welding machines (7) on both sides. Then, the driving component drives the first roller (3) and the second roller (4) to roll, and the can barrel rolls accordingly so that the weld rolls through the laser welding machine (7). At the same time, the threaded damping layer (5) on the first roller (3) applies a friction force to the can barrel axially approaching the abutment frame (6) through the threaded feeding action, thereby keeping the can barrel in contact with the abutment frame (6) and preventing the can barrel from having an uncertain axial movement.

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