A welding auxiliary equipment for large tanks

Abstract

This invention provides a welding auxiliary device for large tanks, relating to the field of welding technology. It includes a ring body and a roller assembly for driving the ring body's rotation. Two ring bodies are coaxial and form a welding station. Cylindrical workpieces can be coaxially inserted into the ring body. The ends of both cylindrical workpieces extend to the welding station, and a spacer is provided between them. Multiple spacers and contact members are evenly spaced along the circumference of the ring body. The contact members contact the cylindrical workpieces. An elastic member is provided between the contact members and the ring body. The elastic member applies a first force along the axial direction of the ring body to the cylindrical workpieces through the contact members, causing the two cylindrical workpieces to tend to move closer to each other. The ends of the two cylindrical workpieces abut against the two sides of the spacer, and the distance between the ends of the two cylindrical workpieces is equal to the size of the spacer. This reduces the possibility of gap differences in the circumferential direction caused by external factors, ensuring the weld formation quality and structural reliability.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding auxiliary device for large tanks. Background Technology

[0002] Large tanks are widely used in industries such as petrochemicals, energy storage, and water treatment. They are mainly used to store liquid and gaseous media such as raw materials, intermediate products, or finished products. Due to their large size and harsh working conditions, it is essential to ensure the overall structural integrity and long-term sealing reliability of the tanks. In the manufacturing process, the tank construction typically begins with the pretreatment and rolling of steel plates, followed by the assembly and welding of individual cylindrical sections. The welding of longitudinal and circumferential seams is a critical process in forming a sealed container, and the quality of the welds depends on the stable support and precise movement provided by the welding auxiliary equipment. Current technology commonly uses welding roller frames as welding auxiliary devices, which mainly consist of a drive wheel set and a driven wheel set. A motor-driven system achieves uniform rotation of the cylindrical workpiece to meet the process requirements of automatic or semi-automatic welding. To accommodate tanks of different diameters and weights, the roller spacing of the adjustable roller frame can be adjusted according to the workpiece size, and frequency conversion control can be used to ensure stable and adjustable rotation speed.

[0003] During the circumferential welding of large tanks, when the cylindrical workpiece rotates under the drive of the roller frame, it is easily affected by external factors (such as the axial movement of the cylindrical workpiece) which can cause gap differences at different circumferential positions of the ends of the two cylindrical workpieces to be welded, thus affecting the forming quality and structural reliability of the weld.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a welding auxiliary device for large tanks to address the problems existing in current tank welding equipment.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A welding auxiliary device for a large tank includes a base, on which are mounted rings and roller assemblies for driving the rings to rotate. Two rings are symmetrically arranged about a first plane, which is vertically aligned. The two rings are coaxial and spaced apart to form a welding station between them. A cylindrical workpiece can be coaxially inserted into the ring, with the ends of both cylindrical workpieces extending to the welding station and spacers between them. Multiple spacers are evenly spaced along the circumference of the rings. Multiple contact elements are evenly spaced along the circumference of the rings, with the number of contact elements equal to the number of spacers and corresponding one-to-one in the circumference of the rings. The contact elements contact the outer wall of the cylindrical workpieces, and the rings drive the cylindrical workpieces to rotate through the contact elements. An elastic element is provided between the contact elements and the rings, and the elastic element applies a first force along the axial direction of the rings to the cylindrical workpieces through the contact elements, so that the two cylindrical workpieces tend to move closer to each other.

[0008] Furthermore, it also includes a moving part and a control unit. The moving part is disposed on the ring body and corresponds one-to-one with the elastic part. When the moving part moves, it can change the deformation of the elastic part to change the magnitude of the first force. Positioning spot welding is performed between two adjacent spacers to generate positioning weld points. The control unit can control the movement of the corresponding moving part according to the position and number of positioning weld points.

[0009] Furthermore, the number of contact parts and spacers is even; when a positioning weld point is generated between two adjacent spacers, the control unit controls the two moving parts farthest from the newly added positioning weld point to move, so as to reduce the deformation of the elastic part and the first force.

[0010] Furthermore, the number of both contact elements and spacers is 4.

[0011] Furthermore, the elastic element is a spring with its axis parallel to the ring body axis, and the moving element moves in the axial direction of the ring body. The control unit includes multiple fixed rings nested inside and outside the ring body and coaxial with the ring body. The fixed rings are mounted on the base and have a first end face and a second end face in their axial direction. The first end face is on a second plane and the second plane is perpendicular to the axis of the fixed ring. The second end face has multiple abutting sections formed sequentially along its circumference. The distance between all abutting sections and the first end face decreases sequentially. One end of the moving element acts on the elastic element, and the other end abuts against the abutting section. When the roller assembly drives the ring body to rotate relative to the fixed ring, the other end of the moving element abuts against all the abutting sections in sequence.

[0012] Furthermore, each fixed ring is configured with inner and outer double layers that are nested together, and the other end of the moving part abuts against the abutting section of the corresponding layer of the fixed ring.

[0013] Furthermore, the elastic element is a compression spring, one end of the moving element acts on one end of the elastic element, and the other end of the elastic element acts on the side of the contact element away from the welding station.

[0014] Furthermore, the moving part and the contacting part are slidably connected, and the sliding direction is the axial direction of the ring.

[0015] Furthermore, the ring body includes two coaxial and spaced-apart side rings, with multiple connectors between the two side rings and contact elements disposed between the two side rings.

[0016] Furthermore, the spacer has a handle.

[0017] The present invention has at least the following beneficial effects:

[0018] (1) The elastic element applies a first force along the axial direction of the ring to the cylindrical workpiece through the contact element, so that the two cylindrical workpieces tend to approach each other, so that the ends of the two cylindrical workpieces abut against the two sides of the spacer respectively, and the distance between the ends of the two cylindrical workpieces is equal to the size of the spacer, reducing the possibility of gap difference in the circumferential direction caused by external factors (such as axial movement of the cylindrical workpieces) interference, and ensuring the forming quality and structural reliability of the weld.

[0019] (2) The control unit controls the movement of the corresponding moving parts according to the position and number of the positioning weld points, so as to change the deformation of the corresponding elastic parts and the magnitude of the first force, so that the magnitude of the first force adapts to the change in the position and number of the support points of the cylindrical workpiece caused by the increase of the positioning weld points, so that the two cylindrical workpieces are subjected to uniform force in their circumferential direction, ensuring the forming quality of the weld and the structural reliability. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of the welding auxiliary equipment for large tanks provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Top view;

[0022] Figure 3 for Figure 2 Sectional view along axis AA;

[0023] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0024] Figure 5 for Figure 1 Exploded view of the middle section of the structure;

[0025] Figure 6 for Figure 5 A diagram from another perspective;

[0026] Figure 7 for Figure 6 Exploded view of the components of the central fixed ring;

[0027] Figure 8 for Figure 2 A cross-sectional view along the CC direction of a cylindrical workpiece;

[0028] Figure 9 for Figure 8 A diagram showing the state of the locating spot weld at point P in the middle;

[0029] Figure 10 for Figure 8 A diagram showing the state of the Q point during tack welding.

[0030] Figure 11 for Figure 8 A diagram showing the state of the locating spot weld at point R in the middle;

[0031] Figure 12 for Figure 8 The diagram shows the state of the locating spot weld at point S in the middle.

[0032] in:

[0033] 101. Base; 102. Ring body; 103. Cylindrical workpiece; 104. Motor; 105. Drive wheel; 106. Driven wheel; 107. Side ring; 108. Connecting component;

[0034] 201. Spacer; 202. Contact element; 203. Elastic element; 204. Moving element; 205. Fixing ring; 206. Abutment section; 207. Support ring; 208. Abutment element; 209. Disc body; 210. Handle. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] like Figures 1 to 12 As shown, this embodiment of the invention provides a welding auxiliary device for large tanks, including a base 101. The base 101 has an annular body 102 and a roller assembly for driving the annular body 102 to rotate. Two annular bodies 102 are symmetrically arranged about a first plane, which is vertically aligned. The two annular bodies 102 are coaxial and spaced apart to form a welding station between them. A cylindrical workpiece 103 can be coaxially inserted into the annular body 102. The ends of both cylindrical workpieces 103 extend to the welding station, and a spacer 201 is provided between them. The spacer 201 is evenly spaced along the circumference of the annular body 102. Multiple contact elements 202 are provided at equal intervals along the circumference of the ring body 102. The number of contact elements 202 and spacers 201 are equal and correspond one-to-one in the circumference of the ring body 102. The contact elements 202 contact the outer wall of the cylindrical workpiece 103. The ring body 102 drives the cylindrical workpiece 103 to rotate through the contact elements 202. An elastic element 203 is provided between the contact elements 202 and the ring body 102. The elastic element 203 applies a first force along the axial direction of the ring body 102 to the cylindrical workpiece 103 through the contact elements 202, so that the two cylindrical workpieces 103 tend to move closer to each other.

[0039] The elastic element 203 applies a first force along the axial direction of the ring 102 to the cylindrical workpiece 103 through the contact element 202, so that the two cylindrical workpieces 103 tend to move closer to each other, so that the ends of the two cylindrical workpieces 103 respectively abut against the two sides of the spacer 201. The distance between the ends of the two cylindrical workpieces 103 is equal to the size of the spacer 201, reducing the possibility of gap differences in the circumferential position of the ends of the two cylindrical workpieces 103 to be welded due to interference from external factors (such as axial movement of the cylindrical workpieces 103), and ensuring the forming quality and structural reliability of the weld.

[0040] Two roller assemblies are symmetrically arranged about the first plane. Each roller assembly includes a motor 104, a driving wheel 105, and a driven wheel 106. The motor 104 is equipped with a corresponding power supply and control module to control start / stop and operating conditions. The axes of both the driving wheel 105 and the driven wheel 106 are parallel to the axis of the ring 102. The motor 104 drives the driving wheel 105 to rotate via belt drive. The driving wheel 105 contacts the outer wall of the ring 102 to drive the ring 102 and the cylindrical workpiece 103 to rotate actively. Multiple driven wheels 106 are respectively arranged on both sides of the cylindrical workpiece 103 to provide stable support. The structure and working principle of the roller assembly described above are existing technologies and will not be elaborated upon in this application. In addition, the welding station is located between the two rings 102. Specifically, the welding station is located directly above the weld seams at the ends of the two cylindrical workpieces 103 and is fixedly installed. In use, the roller assembly drives the rings 102 and the cylindrical workpieces 103 to rotate in order to weld the weld seams at the ends of the two cylindrical workpieces 103. The specific structural settings and operating procedures of the above welding station are all prior art, and this application will not elaborate on them.

[0041] The contact element 202 has a rough surface, which contacts the cylindrical workpiece 103 to generate static friction, thereby transmitting the circumferential force of the ring 102 to the cylindrical workpiece 103 and causing the cylindrical workpiece 103 to rotate. The contact element 202 can be roller-shaped, or the inner side of the contact element 202 can be an arc surface that matches the outer wall of the cylindrical workpiece 103, so that the contact element 202 contacts the outer wall surface of the cylindrical workpiece 103, increasing the contact area and static friction.

[0042] In one embodiment, the device further includes a movable member 204 and a control unit. The movable member 204 is disposed on the ring 102 and corresponds one-to-one with the elastic member 203. When the movable member 204 moves, it can change the deformation of the elastic member 203 to change the magnitude of the first force. Positioning spot welding is performed between two adjacent spacers 201 to generate positioning weld points. The control unit can control the movement of the corresponding movable member 204 according to the position and number of positioning weld points.

[0043] When welding two cylindrical workpieces 103, the general process is to first perform tack welding between two adjacent spacers 201. After all tack welding is completed, continuous welding is then performed between adjacent tack welding points. The positions for tack welding are fixed by the construction personnel, and the roller assembly drives the ring 102 and the cylindrical workpiece 103 to rotate, gradually increasing the number of tack welding points. Both the tack welding points and the spacers 201 can be considered as support points. During the tack welding process, different positions and numbers of tack welding points will cause uneven distribution of support points on the cylindrical workpiece 103 in its circumferential direction, and will also affect the uneven force on the two cylindrical workpieces 103 in its circumferential direction, thus affecting the weld formation quality and structural reliability. To solve the above problems, the control unit controls the movement of the corresponding moving part 204 according to the position and number of the positioning weld points, so as to change the deformation of the corresponding elastic part 203 and the magnitude of the first force, so that the magnitude of the first force adapts to the change in the position and number of support points of the cylindrical workpiece 103 caused by the increase of positioning weld points, so that the two cylindrical workpieces 103 are subjected to uniform force in their circumferential direction, ensuring the forming quality of the weld and the structural reliability.

[0044] In one embodiment, the number of contact members 202 and spacers 201 are both even; when a positioning weld point is generated between two adjacent spacers 201, the control unit controls the two moving members 204 that are furthest from the newly added positioning weld point to move, so as to reduce the deformation of the elastic member 203 and the first force.

[0045] When a locating weld point is formed between two adjacent spacers 201, the control unit moves the two moving parts 204 furthest from the newly added locating weld point to reduce the deformation and first force of the two elastic parts 203. This reduces the magnitude of the first force to adapt to the change in the position and number of support points of the cylindrical workpiece 103 caused by the increase in locating weld points, ensuring that the two cylindrical workpieces 103 are subjected to uniform force in their circumferential direction, thus guaranteeing the weld formation quality and structural reliability. As the number of locating weld points increases, the deformation and first force of all elastic parts 203 are gradually reduced.

[0046] The number of contact elements 202 and spacers 201 is multiple and even, so the total number is at least 4. For example, there are four contact elements 202 and four spacers 201. When locating spot welding is performed between two adjacent spacers 201, locating weld points are generated between them. In the circumferential direction of the cylindrical workpiece 103, the lower half has two support points, and the upper half adds one support point to become three support points. The first force exerted by the contact element 202 on the cylindrical workpiece 103 is shared by the newly added locating weld points. Therefore, the first force on each support point decreases. At this time, there are two options: one is to increase the first force exerted by the upper half of the contact element 202 on the cylindrical workpiece 103, and the other is to decrease the first force exerted by the lower half of the contact element 202 on the cylindrical workpiece 103. Since the number of locating weld points gradually increases during the locating spot welding process, the two cylindrical workpieces 103 gradually stabilize and connect. Therefore, this application adopts the second option, that is, to decrease the first force exerted by the lower half of the contact element 202 on the cylindrical workpiece 103. Therefore, the first force should be at its maximum initially.

[0047] Specifically, initially, see Figure 8 Four contact elements 202 are evenly distributed around the cylindrical workpiece 103 and serve as support points. They are numbered 1, 2, 3 and 4 respectively. They generate a first force aF along the axial direction on the cylindrical workpiece 103 through the elastic element 203. The reaction force aF is also applied to the cylindrical workpiece 103 by the spacer 201.

[0048] When performing tack welding at point P between points 3 and 4, a tack weld point is formed at point P. See [link / reference]. Figure 9 In the circumferential direction of the cylindrical workpiece 103, the lower half has two support points, and the upper half has one additional support point, making it three support points. The first force exerted by the contact member 202 on the cylindrical workpiece 103 is shared by the newly added positioning weld point. Therefore, the first force on each support point decreases. At this time, the control unit controls the two moving members 204 furthest from the newly added positioning weld point to move, that is, the moving members 204 at positions 1 and 2 move, so as to reduce the deformation of the elastic member 203 at positions 1 and 2, so that the first force at positions 1 and 2 is reduced from aF to bF, where a>b, thereby making the two cylindrical workpieces 103 uniformly stressed in their circumferential direction.

[0049] When performing tack welding at point Q between points 1 and 4, a tack weld point is formed at point Q. See [link / reference]. Figure 10In the circumferential direction of the cylindrical workpiece 103, the lower left half is equivalent to 2 support points, and the upper right half is equivalent to 4 support points. The first force exerted by the contact member 202 on the cylindrical workpiece 103 is shared by the newly added positioning weld points. Therefore, the first force on each support point decreases. At this time, the control unit controls the two moving members 204 farthest from the newly added positioning weld points to move, that is, the moving members 204 at positions 2 and 3 move, so as to reduce the deformation of the elastic members 203 at positions 2 and 3, so that the first force at position 2 decreases from bF to cF, and the first force at position 3 decreases from aF to bF, b>c, so that the two cylindrical workpieces 103 are subjected to uniform force in their circumferential direction.

[0050] When performing tack welding at point R between points 1 and 2, a tack weld point is formed at point R. See [link / reference]. Figure 11 In the circumferential direction of the cylindrical workpiece 103, the left half is equivalent to 3 support points and the right half is equivalent to 4 support points. The first force exerted by the contact member 202 on the cylindrical workpiece 103 is shared by the newly added positioning weld points. At this time, the control unit controls the two moving members 204 farthest from the newly added positioning weld points to move, that is, the moving members 204 at positions 3 and 4 move, so as to reduce the deformation of the elastic members 203 at positions 3 and 4, so that the first force at position 3 is reduced from bF to cF and the first force at position 4 is reduced from aF to bF, thereby making the two cylindrical workpieces 103 uniformly stressed in their circumferential direction.

[0051] When performing tack welding at point S between points 2 and 3, a tack weld point is formed at point S. See [link / reference]. Figure 12 There are a total of 4 support points in the circumferential direction of the cylindrical workpiece 103. At this time, the control unit controls the two moving parts 204 that are farthest from the newly added positioning welding point to move, that is, the moving parts 204 at 1 and 4 move, so as to reduce the deformation of the elastic parts 203 at 1 and 4, so that the first force at 3 and 4 is reduced from bF to cF, thereby making the two cylindrical workpieces 103 uniformly stressed in their circumferential direction, both of which are cF.

[0052] As can be seen from the above, when the number of contact members 202 is 6, 8 or more, the moving member 204 at the corresponding position can still be moved according to the above rules, so as to reduce the deformation of the elastic member 203 and the first force at the corresponding position.

[0053] In one embodiment, the number of both the contact element 202 and the spacer element 201 is 4.

[0054] The four contact elements 202 and the spacer 201 are sufficient to support the cylindrical workpiece 103 and drive it to rotate. At the same time, there are also four positioning weld points, which improves welding efficiency.

[0055] In one embodiment, see Figures 4 to 7The elastic element 203 is a spring with its axis parallel to the axis of the ring 102. The moving element 204 moves in the axial direction of the ring 102. The control unit includes multiple fixed rings 205 nested in sequence and coaxial with the ring 102. The fixed rings 205 are disposed on the base 101. The fixed rings 205 have a first end face and a second end face in their axial direction. The first end face is on a second plane and the second plane is perpendicular to the axis of the fixed ring 205. The second end face has multiple abutment sections 206 formed in sequence along its circumference. The distance between all abutment sections 206 and the first end face decreases in sequence. One end of the moving element 204 acts on the elastic element 203, and the other end abuts against the abutment section 206. When the roller assembly drives the ring 102 to rotate relative to the fixed ring 205, the other end of the moving element 204 abuts against all abutment sections 206 in sequence.

[0056] When the roller assembly drives the ring 102 to rotate relative to the fixed ring 205, the other end of the moving part 204 abuts against all the abutting sections 206 in sequence. Since the distance between all the abutting sections 206 and the first end face decreases in sequence, the corresponding moving part 204 is driven to move along the axial direction of the ring 102, which in turn reduces the deformation of the elastic part 203 in the axial direction of the ring 102, thereby reducing the first force.

[0057] The base 101 is fixed with a support ring 207, and the fixing ring 205 is installed on the support ring 207.

[0058] It is understandable that the number of abutment sections 206 is always 3, regardless of the number of contact members 202. The difference in distance between two adjacent abutment sections 206 and the first end face can be selected and set according to requirements, so that the moving member 204 at the corresponding position moves a certain distance, and the deformation of the elastic member 203 and the first force at the corresponding position decrease by a certain value. The connection between two adjacent abutment sections 206 is provided with rounded corners or chamfers, so that the other end of the moving member 204 can smoothly switch from abutting one of the abutment sections 206 to abutting the adjacent abutment section 206. Initially, the other end of the moving member 204 abuts against the abutment section 206 that is furthest from the first end face, so that the first force is at its maximum.

[0059] In other embodiments not shown, a telescopic member can be used instead of the fixed ring 205. The fixed end of the telescopic member is disposed on the ring body 102, and the telescopic end of the telescopic member is connected to the movable member 204. The telescopic end of the telescopic member drives the movable member 204 to extend or retract, thereby changing the deformation and the first force of the elastic member 203. The telescopic member can be a cylinder or hydraulic cylinder, etc., and is equipped with a corresponding power source. The telescopic end of the telescopic member can be precisely controlled by a PLC.

[0060] In one embodiment, each fixed ring 205 is arranged in inner and outer double layers and nested with each other. The other end of the moving member 204 abuts against the abutment section 206 of the corresponding layer of the fixed ring 205, so that the moving member 204 is subjected to uniform force in the axial direction of the ring body 102, thereby making the process of the abutment section 206 driving the moving member 204 to move along the axial direction of the ring body 102 more stable.

[0061] It is worth noting that there are four contact elements 202, therefore there are also four fixing rings 205, each of which is double-layered. Preferably, the innermost fixing ring 205 can be a single-layered design, with an abutment 208 at the other end of the moving element 204, which abuts against the abutment section 206 of the fixing ring 205. The other fixing rings 205 are all double-layered, with the inner and outer layers nested together. The other end of the moving element 204 has two abutments 208, which abut against the abutment section 206 of the corresponding layer of the fixing ring 205. For example, if the four fixing rings 205 are numbered ①, ②, ③, and ④, then when the fixing rings 205 are double-layered from the inside out or from the outside in, the numbering is ①, ②, ③, ④, ③, ②, ①.

[0062] In one embodiment, see Figure 4 The elastic element 203 is a compression spring. One end of the moving element 204 acts on one end of the elastic element 203, and the other end of the elastic element 203 acts on the side of the contact element 202 away from the welding station.

[0063] In other embodiments not shown, the elastic element 203 may also be a tension spring. One end of the moving element 204 acts on one end of the elastic element 203, and the other end of the elastic element 203 acts on the side of the contact element 202 near the welding station.

[0064] In one embodiment, the movable member 204 is slidably connected to the contact member 202 and the sliding direction is the axial direction of the ring 102.

[0065] The movable part 204 is rod-shaped, and the contact part 202 has a through hole. The movable part 204 is slidably inserted into the through hole, and the movable part 204 and the contact part 202 are connected by a key to avoid relative rotation between the two.

[0066] In one embodiment, the ring body 102 includes two coaxial and spaced-apart side rings 107, with a plurality of connectors 108 between the two side rings 107, and a contact 202 disposed between the two side rings 107.

[0067] The side ring 107 also has a through hole, and the movable member 204 is slidably inserted into the through hole. The movable member 204 and the side ring 107 are connected by a key to prevent relative rotation between them. A disc 209 is formed on the movable member 204. The disc 209 is located between the two side rings 107. The disc 209 abuts or is fixed to one end of the elastic member 203. The elastic member 203 causes the disc 209 to abut against one of the side rings 107.

[0068] In one embodiment, the spacer 201 has a handle 210. The spacer 201 is a gasket, and spacers 201 of different thicknesses can be used according to welding requirements. The spacer 201 is provided with a handle 210 on the outer side relative to the ring 102 to facilitate the installation and removal of the spacer 201 by holding the handle 210.

[0069] The working principle of this invention is as follows:

[0070] Two cylindrical workpieces 103 are inserted into corresponding ring bodies 102. Multiple spacers 201 are placed at the ends of the two cylindrical workpieces 103. The elastic member 203 applies a first force along the axial direction of the ring body 102 to the cylindrical workpieces 103 through the contact member 202, so that the two cylindrical workpieces 103 tend to move closer to each other, so that the ends of the two cylindrical workpieces 103 respectively abut against the two sides of the spacers 201. The distance between the ends of the two cylindrical workpieces 103 is equal to the size of the spacers 201, reducing the possibility of gap differences in the circumferential position of the ends of the two cylindrical workpieces 103 to be welded due to interference from external factors (such as axial movement of the cylindrical workpieces 103), and ensuring the forming quality and structural reliability of the weld.

[0071] When welding two cylindrical workpieces 103, the general process is to first perform tack welding between two adjacent spacers 201. After all tack welding is completed, continuous welding is then performed between adjacent tack welding points. The positions for tack welding are fixed by the construction personnel. The motor 104 drives the drive wheel 105 to rotate via belt drive. The drive wheel 105 contacts the outer wall of the ring 102 to drive the ring 102 and the cylindrical workpiece 103 to rotate actively, so as to gradually perform tack welding, increasing the number of tack welding points one by one. Both the tack welding points and the spacers 201 can be regarded as support points.

[0072] During the locating spot welding process, the varying positions and numbers of the locating weld points can cause uneven distribution of support points on the cylindrical workpiece 103 in its circumferential direction, resulting in uneven stress on the two cylindrical workpieces 103 in the circumferential direction and affecting the weld formation quality and structural reliability. To address these issues, when a locating weld point is generated between two adjacent spacers 201, the control unit controls the two moving parts 204 furthest from the newly added locating weld point to move. Specifically, the other end of the moving part 204 can abut against different abutment sections 206 to drive the moving part 204 to move, thereby reducing the deformation and first force of the two elastic parts 203. This allows the magnitude of the first force to adapt to the change in the position and number of support points on the cylindrical workpiece 103 caused by the increase in locating weld points, ensuring uniform stress on the two cylindrical workpieces 103 in the circumferential direction and guaranteeing the weld formation quality and structural reliability. As the number of locating weld points increases, the deformation and first force of all elastic parts 203 are gradually reduced.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A welding auxiliary device for a large tank body, characterized by, The base is provided with a ring body and a roller assembly for driving the ring body to rotate, the ring body is symmetrically provided with two about a first plane, the first plane is vertically arranged, the two ring bodies are coaxially and spaced apart to form a welding station between them, a cylindrical workpiece can be coaxially inserted into the ring body, the end portions of the two cylindrical workpieces extend to the welding station and are provided with a spacer therebetween, the spacer is provided with a plurality of equal intervals along the circumference of the ring body; a plurality of contact pieces are provided on the ring body along the circumference thereof, the number of contact pieces is equal to that of the spacers and corresponds to each other in the circumferential direction of the ring body, the contact pieces are in contact with the outer wall of the cylindrical workpiece, and the ring body drives the cylindrical workpiece to rotate through the contact pieces; the contact piece and the ring body are provided with an elastic piece, the elastic piece applies a first force to the cylindrical workpiece along the axial direction of the ring body through the contact piece, so that the two cylindrical workpieces have a tendency to approach each other; It also includes a moving piece and a control part, the moving piece is arranged on the ring body and corresponds to the elastic piece one by one, and the moving piece can change the deformation amount of the elastic piece when moving to change the size of the first force; the positioning spot welding is carried out between the adjacent two spacers to generate a positioning spot, and the control part can control the movement of the corresponding moving piece according to the position and number of the positioning spot; The number of contact pieces and spacers is even; when the positioning spot is generated between the adjacent two spacers, the control part controls the movement of the two moving pieces farthest from the new positioning spot to reduce the deformation amount of the elastic piece and the first force; The elastic piece is a spring with its axis parallel to the axis of the ring body, and the moving direction of the moving piece is the axial direction of the ring body; the control part includes a plurality of fixed rings which are nested in sequence from inside to outside and coaxial with the ring body, the fixed ring is arranged on the base, the fixed ring has a first end face and a second end face in its axial direction, the first end face is on the second plane, and the second plane is perpendicular to the axis of the fixed ring, the second end face sequentially forms a plurality of abutting sections along its circumferential direction, the distance between all abutting sections and the first end face decreases in turn, one end of the moving piece acts on the elastic piece, and the other end abuts against the abutting section, when the roller assembly drives the ring body to rotate relative to the fixed ring, the other end of the moving piece abuts against all abutting sections in turn.

2. The welding assist apparatus for a large tank body according to claim 1, characterized by, The number of contact pieces and spacers is 4.

3. The welding assist apparatus for a large tank body according to claim 1, characterized by, Each fixed ring is arranged in double layers from inside to outside and nested with each other, and the other end of the moving piece abuts against the abutting section of the corresponding layer of the fixed ring.

4. The welding assist apparatus for a large tank body according to claim 1, characterized by, The elastic piece is a compression spring, one end of the moving piece acts on one end of the elastic piece, and the other end of the elastic piece acts on the side of the contact piece away from the welding station.

5. The welding assist apparatus for a large tank body according to claim 4, characterized by, The moving piece and the contact piece are in sliding connection and the sliding direction is the axial direction of the ring body.

6. The welding assist apparatus for a large tank body according to claim 5, characterized by, The ring body includes two coaxial and spaced apart side rings, a plurality of connecting pieces are arranged between the two side rings, and the contact piece is arranged between the two side rings.

7. The welding assist apparatus for a large tank body according to Claim 1, wherein The spacer has a handle.

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