Welding equipment for circular seam of stainless steel rocket storage tank

Abstract

The utility model provides welding equipment for a circular seam of a stainless steel rocket storage tank. The welding equipment comprises a circular seam welding outer pressing module and a welding module, the girth welding outer pressing module comprises a pressing mechanism rack, outer pressing mechanism supporting stand columns and an outer pressing mechanism supporting base, and the outer pressing mechanism supporting stand columns are arranged at the two ends of the outer pressing mechanism supporting base correspondingly. The pressing mechanism rack is arranged on the outer pressing mechanism supporting stand column, and the outer pressing mechanism supporting stand column is used for supporting the pressing mechanism rack. The pressing mechanism rack is provided with a pressing block, and the pressing block is used for pressing the circular seam; the welding module is arranged on the outer pressing mechanism supporting base and can move in the welding direction of the circular seam relative to the outer pressing mechanism supporting base. And the welding module comprises a welding head, and the welding head is used for welding the circular seam. The welding equipment can improve the quality and performance of welding seams.

Description

Technical Field

[0001] The utility model relates to the field of launch vehicles, in particular to a welding device for annular seams of stainless steel rocket tanks. Background Art

[0002] In the existing manufacturing process of large-diameter stainless steel rocket tanks, it is necessary to weld the butt joint annular seams between short tubes and short tubes, and the butt joint annular seams between short tubes and heads. The performance and quality of the welds directly affect the safety and reliability of the rocket tank.

[0003] In order to improve the performance and quality of tank welds, it is particularly important to design a welding equipment for the circumferential seam of stainless steel rocket tanks. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a welding device for the annular seam of a stainless steel rocket tank.

[0005] The utility model provides a welding device for the annular seam of a stainless steel rocket tank, comprising: an annular seam welding external clamping module and a welding module; the annular seam welding external clamping module comprises a clamping mechanism frame, an external clamping mechanism support column and an external clamping mechanism support base, and the external clamping mechanism support columns are respectively arranged at both ends of the external clamping mechanism support base; the clamping mechanism frame is arranged on the external clamping mechanism support column, and the external clamping mechanism support column is used to support the clamping mechanism frame; the clamping mechanism frame is provided with a clamping block, and the clamping block is used to clamp the annular seam; the welding module is arranged on the external clamping mechanism support base, and can move relative to the external clamping mechanism support base along the welding direction of the annular seam; the welding module comprises a welding head, and the welding head is used to weld the annular seam.

[0006] According to one embodiment of the utility model, the external clamping mechanism supports a base on which a base circular arc bevel gear guide rail is arranged; the welding module also includes a frame base, and the welding head is arranged on the frame base; the lower end surface of the frame base is provided with a driving bevel gear mechanism meshing with the base circular arc bevel gear guide rail, and the driving bevel gear mechanism moves along the base circular arc bevel gear guide rail when driven.

[0007] According to one embodiment of the utility model, the external clamping mechanism support base is provided with a base guide rail, and the lower end surface of the frame base is provided with a guide wheel corresponding to the base guide rail; the guide wheel moves along the base guide rail to provide guidance for the welding module to move along the circumferential seam welding direction.

[0008] According to an embodiment of the present invention, the welding module further comprises a frame column; the welding head is mounted on the frame column and can slide in multiple directions relative to the frame column.

[0009] According to an embodiment of the utility model, the frame column is provided with a connecting plate perpendicular thereto; a radial guide rail is provided on the connecting plate, and the welding head is slidably arranged relative to the radial guide rail to approach or move away from the annular seam to be welded.

[0010] According to one embodiment of the utility model, the frame column is provided with a third screw rod in the vertical direction, and the third screw rod is provided with a third screw rod slider; the connecting plate is connected to the frame column through the third screw rod slider, and the third screw rod slider can be slidably arranged along the axial direction of the third screw rod to adjust the welding height of the welding head.

[0011] According to an embodiment of the utility model, the welding head is provided with clamping wheels on both sides thereof along the welding direction, and the clamping wheels are used to clamp the edges to be welded.

[0012] According to an embodiment of the utility model, the clamping mechanism frame is provided with a clamping cylinder, and the clamping block is connected to the clamping mechanism frame via the clamping cylinder; the clamping cylinder drives the clamping block to approach or move away from the annular gap by telescoping.

[0013] According to one embodiment of the utility model, the external clamping mechanism support column has a fourth screw rod along the vertical direction; the fourth screw rod is provided with a fourth slider that can slide along the axial direction, the clamping mechanism frame bracket is fixedly connected to the fourth slider, and slides along the fourth screw rod through the fourth slider to adjust the height of the clamping mechanism frame.

[0014] According to one embodiment of the utility model, it also includes a welding support module; the welding support module includes an annular welding bottom guide rail and a welding bottom support seat, and the welding bottom guide rail is installed on the welding bottom support seat; the external clamping mechanism support base is arranged on the welding bottom support seat, and the lower end surface of the external clamping mechanism support base is provided with a limiting wheel corresponding to the welding bottom guide rail; the limiting wheel is movable along the welding bottom guide rail to drive the welding module to rotate around the circumferential direction of the tank short cylinder.

[0015] According to the utility model, the welding equipment for the annular seam of a stainless steel rocket tank is used to compress the butt annular seams between short tubes and short tubes, and the butt annular seams between a short tube and a head (sealing box), through the annular seam welding external compression module, and the auxiliary welding module performs the annular seam welding, which can improve the quality and performance of the welds.

[0016] It should be understood that the above general description and the following specific embodiments are only exemplary and illustrative and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are a part of the specification of the present utility model, which illustrate exemplary embodiments of the present utility model. The attached drawings and the description of the specification are used to explain the principle of the utility model.

[0018] Figure 1 It is a three-dimensional diagram of a welding device for annular seams of a stainless steel rocket tank according to an embodiment of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of a welding device for annular seams of a stainless steel rocket tank according to an embodiment of the utility model;

[0020] Figure 3 It is a partial stereogram of a girth welded external clamping module according to an embodiment of the utility model;

[0021] Figure 4 This is a three-dimensional diagram of a girth welded external clamping module according to an embodiment of the utility model;

[0022] Figure 5 It is a three-dimensional diagram of a welding module according to an embodiment of the utility model;

[0023] Figure 6 It is a rear view of a welding module according to an embodiment of the utility model;

[0024] Figure 7 It is a three-dimensional diagram of a welding module according to an embodiment of the utility model;

[0025] Figure 8 It is a top view of a circumferential seam welded external clamping module according to an embodiment of the utility model;

[0026] Fig. 9 It is a partial side view of a girth welded external clamping module of an embodiment of the utility model;

[0027] Fig.10 It is a three-dimensional diagram of a welding device for annular seams of a stainless steel rocket tank according to an embodiment of the utility model;

[0028] Fig.11 It is a top view of a welding module according to an embodiment of the utility model.

[0029] Description of reference numerals:

[0030] 3-Circumferential seam welding external clamping module; 4-Welding module; 5-Welding support module; 3-1 Clamping mechanism frame; 3-2 Clamping cylinder; 3-3 Clamping block; 3-4 Clamping mechanism support column; 3-5 External clamping mechanism support base; 3-6 External clamping mechanism mounting seat; 3-7 Base arc bevel gear guide rail; 3-8 Base guide rail; 3-9 Fourth screw rod; 3-10 Limiting wheel; 3-11 Base driving mechanism; 4-1 Frame column; 4-2 Welding head; 4-3 Rolling mechanism; 4-4 Frame base; 4-5 Driving bevel gear mechanism; 4-6 Guide wheel; 4-7 Clamping wheel; 4-8 Connecting plate; 4-9 Third screw rod; 5-1 Welding bottom guide rail; 5-2 Welding bottom support seat; 5-3 Guardrail. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are used to illustrate the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the sizes of some structural components or areas in the drawings may be enlarged for other structural components or areas to help understand the embodiments of the present invention.

[0032] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the utility model. In the description of the utility model, it should be noted that, unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In addition, the terms "include", "comprise", "have" or any other variations thereof are intended to cover non-exclusive inclusion, so that a structure or component including a series of elements includes not only those elements, but also other mechanical elements that are not explicitly listed or inherent in the structure or component. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the article or device including the elements.

[0034] Spatially related terms such as "below", "beneath", "under", "low", "above", "on", "high", etc. are used to facilitate description to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. In addition, for example, "one element is above / below another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and do not specifically refer to the meaning of order or sequence, and should not be regarded as limiting. Similar terms are used throughout the description to represent similar elements.

[0035] In the process of describing the present utility model below, in certain scene descriptions, only "rocket", "launch vehicle", "spacecraft", "space vehicle" or "missile" may be used. This is only for the convenience of description, and its connotation is not limited to the specific words used. Generally, the rocket and launch vehicle of the present utility model include not only space vehicles used to carry satellites or spacecraft or other probes, but also various types of missiles, rockets and other weapons used to carry military payloads, as well as similar products that can send payloads into the air. When interpreting the above specific words, those skilled in the art shall not limit launch vehicles and rockets to only one of carriers or missiles based on the specific words used to describe the scene, thereby narrowing the scope of protection of the present utility model.

[0036] For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention.

[0037] Figure 1 It is a three-dimensional diagram of a welding device for annular seams of a stainless steel rocket tank according to an embodiment of the utility model; Figure 2 It is a three-dimensional diagram of a welding device for annular seams of a stainless steel rocket tank according to an embodiment of the utility model; Figure 3 It is a partial stereogram of a girth welded external clamping module according to an embodiment of the utility model; Figure 4 This is a three-dimensional diagram of a girth welded external clamping module according to an embodiment of the utility model; Figure 5 It is a three-dimensional diagram of a welding module according to an embodiment of the utility model; Figure 6 It is a rear view of a welding module according to an embodiment of the utility model; Figure 7 It is a three-dimensional diagram of a welding module according to an embodiment of the utility model; Figure 8 It is a top view of a circumferential seam welded external clamping module according to an embodiment of the utility model; Fig. 9 It is a partial side view of a girth welded external clamping module of an embodiment of the utility model; Fig.10 It is a three-dimensional diagram of a welding device for annular seams of a stainless steel rocket tank according to an embodiment of the utility model; Fig.11 It is a top view of a welding module according to an embodiment of the utility model.

[0038] like Figure 1-5 As shown, the utility model provides a welding device for the annular seam of a stainless steel rocket tank, comprising: an external clamping module 3 for annular seam welding and a welding module 4. The external clamping module 3 for annular seam welding comprises a clamping mechanism frame 3-1, an external clamping mechanism support column 3-4 and an external clamping mechanism support base 3-5, and external clamping mechanism support columns 3-4 are respectively arranged at both ends of the external clamping mechanism support base 3-5. The clamping mechanism frame 3-1 is arranged on the external clamping mechanism support column 3-4, and the external clamping mechanism support column 3-4 is used to support the clamping mechanism frame 3-1. The clamping mechanism frame 3-1 is provided with a clamping block 3-3, and the clamping block 3-3 is used to clamp the annular seam. The welding module 4 is arranged on the external clamping mechanism support base 3-5, and can move relative to the external clamping mechanism support base 3-5 along the welding direction of the annular seam. The welding module 4 comprises a welding head 4-2, and the welding head 4-2 is used to weld the annular seam.

[0039] In this embodiment, the girth welding external clamping module 3 is used to clamp the butt girth between the short tubes and the butt girth between the short tubes and the head, and the auxiliary welding module 4 performs girth welding, which can improve the quality and performance of the weld. The welding head 4-2 can be a laser welding head 4-2. The external clamping mechanism support base 3-5 can be an arc-shaped body that matches the outer side of the short tube.

[0040] like Figure 3 and Figure 6 As shown, according to an embodiment of the utility model, the external clamping mechanism supports the base 3-5 to set the base circular arc bevel gear guide rail 3-7. The welding module 4 also includes a frame base 4-4, and the welding head 4-2 is arranged on the frame base 4-4. The lower end surface of the frame base 4-4 is provided with a driving bevel gear mechanism 4-5 meshing with the base circular arc bevel gear guide rail 3-7, and the driving bevel gear mechanism 4-5 moves along the base circular arc bevel gear guide rail 3-7 when driven.

[0041] In this embodiment, the driving bevel gear mechanism 4-5 moves along the base circular arc bevel gear guide rail 3-7 when driven, driving the welding head to move along the welding direction of the annular seam to achieve the welding of the annular seam. The two ends of the base circular arc bevel gear guide rail 3-7 can extend to the external clamping mechanism support columns 3-4 set at both ends of the external clamping mechanism support base 3-5 respectively. The base circular arc bevel gear guide rail 3-7 is an arc shape that matches the outer side surface of the short tube. The driving bevel gear mechanism 4-5 may include a driving motor and a gear, and the driving motor drives the gear to rotate along the base circular arc bevel gear guide rail 3-7, which can drive the welding module 4 to perform reciprocating circular arc motion to weld the annular seam along the circumferential direction of the short tube. The base circular arc bevel gear guide rail 3-7 can be locked on the external clamping mechanism support base 3-5 by screws.

[0042] According to an embodiment of the utility model, the external clamping mechanism supports the base 3-5 to be provided with a base rail 3-8, and the lower end surface of the frame base 4-4 is provided with a guide wheel 4-6 corresponding to the base rail 3-8. The guide wheel 4-6 moves along the base rail 3-8 to provide guidance for the welding module 4 to move along the circumferential seam welding direction.

[0043] In this embodiment, the base rail 3-8 can be an arc shape that matches the outer side of the short tube, ensuring that the welding module 4 can make reciprocating arc motion along the base rail 3-8. The base rail 3-8 can be screwed to the external clamping mechanism support base 3-5. Figure 3 As shown, the base arc bevel gear guide rail 3-7 and the base guide rail 3-8 are arranged at intervals in the radial direction, thereby providing drive and guidance for the movement of the welding module 4 at the same time.

[0044] According to an embodiment of the present invention, in addition to the welding head 4-2, the welding module 4 further includes a frame column 4-1. The welding head 4-2 is mounted on the frame column 4-1 and can slide relative to the frame column 4-1 in multiple directions.

[0045] In this embodiment, the rack column 4 - 1 can be set on the rack base 4 - 4 .

[0046] like Figure 6 and 7 As shown, according to an embodiment of the utility model, the frame column 4-1 is provided with a connecting plate 4-8 perpendicular thereto. A radial guide rail is provided on the connecting plate 4-8, and the welding head 4-2 is slidably arranged relative to the radial guide rail to approach or move away from the annular seam to be welded.

[0047] In this embodiment, the radial guide rail may be provided with an electrically driven slider, and the welding head 4 - 2 is mounted on the electrically driven slider.

[0048] According to one embodiment of the utility model, the frame column 4-1 is provided with a third screw rod 4-9 in the vertical direction, and the third screw rod 4-9 is provided with a third screw rod slider. The connecting plate 4-8 is connected to the frame column 4-1 through the third screw rod slider, and the third screw rod slider can be slidably arranged along the axial direction of the third screw rod 4-9 to adjust the welding height of the welding head 4-2.

[0049] In this embodiment, the third screw slider slides along the axial direction of the third screw 4-9, which can drive the welding head 4-2 to move along the vertical direction of the frame column 4-1 (that is, the axial direction of the third screw), and adjust the height of the welding head 4-2 to adapt to the annular seam position.

[0050] According to an embodiment of the present invention, the welding head 4-2 is provided with clamping wheels 4-7 on both sides thereof along the welding direction, and the clamping wheels 4-7 are used to clamp the edges to be welded.

[0051] In this embodiment, the clamping wheels 4-7 clamp the edges to be welded before welding, which can eliminate the misalignment of the weld, that is, the shape can be adjusted before welding to improve the welding effect.

[0052] According to an embodiment of the present invention, the clamping mechanism frame 3-1 is provided with a clamping cylinder 3-2, and the clamping block 3-3 is connected to the clamping mechanism frame 3-1 through the clamping cylinder 3-2. The clamping cylinder 3-2 drives the clamping block 3-3 to approach or move away from the annular gap by telescoping.

[0053] In this embodiment, the clamping cylinder 3-2 may be an air cylinder, and the clamping block 3-3 is mounted on the driving rod of the clamping cylinder 3-2. The contact surface between the clamping block 3-3 and the annular seam may be an arc-shaped surface, and the radius of the arc-shaped surface is equal to the outer radius of the short cylinder. The clamping block 3-3 may be an electromagnetic clamping block. For example, when the annular seam is rolled, the power supply of the electromagnetic clamping block is started to provide suction for the electromagnetic clamping block, and the suction can act on the inner support tooling to provide suction support while the clamping block 3-3 presses the annular seam. The suction of the electromagnetic clamping block cooperates with the internal support of the inner support tooling to effectively solve the problem that the rolling force acting on the inner support tooling can easily cause the support to become unstable. The welding equipment can provide pulling force, and through the suction support, most of the rolling force can be offset during rolling, ensuring that the rolling force acting on the inner support tooling is within a preset range, thereby reducing the rigidity requirements for the inner support tooling.

[0054] The clamping mechanism frame 3-1 can be provided with multiple groups of clamping cylinders 3-2 and clamping blocks 3-3. For example, along the length direction of the clamping mechanism frame 3-1 (i.e., the direction roughly consistent with the butt joint ring seam), multiple groups of clamping cylinders 3-2 and clamping blocks 3-3 corresponding to each other can be evenly arranged. The clamping mechanism frame 3-1 can be provided with two symmetrical rows of clamping cylinders 3-2 and clamping blocks 3-3, which are respectively used to clamp the two sides of the butt joint ring seam. For example, the spacing distance between the two rows of clamping cylinders 3-2 and clamping blocks 3-3 can be 40~80mm, providing avoidance space for welding and rolling.

[0055] like Figure 8 As shown, according to one embodiment of the utility model, external clamping mechanism mounting seats 3-6 are respectively provided on the sides of the external clamping mechanism support columns 3-4 that are away from each other. The clamping mechanism frame 3-1 includes a clamping mechanism frame crossbeam 3-1-1, and clamping mechanism frame brackets 3-1-2 are respectively provided at both ends of the clamping mechanism frame crossbeam 3-1-1. The clamping mechanism frame crossbeam 3-1-1 is used to install the clamping cylinder 3-2 and the clamping block 3-3. The two clamping mechanism frame brackets 3-1-2 of the clamping mechanism frame 3-1 are respectively placed on the corresponding external clamping mechanism mounting seats 3-6 to support the clamping mechanism frame 3-1.

[0056] like Fig. 9 As shown, according to one embodiment of the utility model, the outer clamping mechanism support column 3-4 is provided with a fourth screw rod 3-9 in the vertical direction. The fourth screw rod 3-9 is provided with a fourth slider that can slide in the axial direction, and the clamping mechanism frame 3-1 bracket is fixedly connected to the fourth slider, and slides along the fourth screw rod 3-9 through the fourth slider to adjust the height of the clamping mechanism frame 3-1.

[0057] In this embodiment, the fourth screw rod 3-9 is arranged on the sides of the external clamping mechanism support columns 3-4 at both ends of the external clamping mechanism support base 3-5, which are away from each other. The clamping mechanism frame bracket 3-1-2 is fixedly connected to the fourth slider. The welding equipment can drive the annular seam welding clamping mechanism frame 3-1, the clamping cylinder 3-2 and the clamping block 3-3 to move up and down in the vertical direction through the fourth slider moving along the axial direction of the fourth screw rod 3-9 to adapt to the height of the butt joint annular seam between the short cylinders and the butt joint annular seam between the short cylinder and the head, and to clamp the annular seam. The axial direction of the external clamping mechanism support column 3-4 or the fourth slider along the fourth screw rod 3-9 is the vertical direction of the welding equipment in actual application.

[0058] Those skilled in the art can understand that, in order to ensure that the clamping mechanism support column 3-4 supports the clamping mechanism frame 3-1 more stably, multiple clamping mechanism support columns 3-4 can be set at both ends of the external clamping mechanism support base 3-5 (such as two clamping mechanism support columns 3-4 are set at both ends of the external clamping mechanism support base 3-5), and accordingly, each clamping mechanism support column 3-4 can be provided with a fourth screw rod 3-9, a fourth slider and an external clamping mechanism mounting seat 3-6. In this case, the clamping mechanism bracket 3-1 can be connected to the fourth sliders at both ends and slide relative to the clamping mechanism support column 3-4.

[0059] According to an embodiment of the present invention, in addition to the circumferential seam welding clamping module 3 and the welding module 4, the welding device further includes a welding support module 5. Figure 1 As shown, the welding support module 5 includes an annular welding bottom rail 5-1 and a welding bottom support seat 5-2, and the welding bottom rail 5-1 is installed on the welding bottom support seat 5-2. The external clamping mechanism support base 3-5 is arranged on the welding bottom support seat 5-2, and the lower end surface of the external clamping mechanism support base 3-5 is provided with a limiting wheel 3-10 corresponding to the welding bottom rail 5-1. The limiting wheel 3-10 is movable along the welding bottom rail 5-1 to drive the welding module 4 to rotate around the circumferential direction of the tank short cylinder.

[0060] In this embodiment, the limiting wheel 3-10 moves along the welding bottom guide rail 5-1, which can drive the annular seam welding outer clamping module 3 and the welding module 4 to rotate around the circumferential direction of the short cylinder to clamp and weld the entire annular seam.

[0061] According to an embodiment of the utility model, the external clamping mechanism supporting base 3-5 is provided with a base driving mechanism 3-11. The base driving mechanism 3-11 cooperates with the limiting wheel 3-10 to drive the external clamping mechanism supporting base 3-5 to move along the welding bottom guide rail 5-1.

[0062] In this embodiment, the base driving mechanism 3-11 can be composed of a motor and a roller. The welding bottom guide rail 5-1 can be a double-track structure. Accordingly, the external clamping mechanism supporting base 3-5 can be provided with multiple sets of base driving mechanisms 3-11 and limiting wheels 3-10 (such as four sets), and the stability and reliability of welding when welding the tank annular seam can be improved by supporting and driving the welding module at multiple points.

[0063] like Fig.10 As shown, according to one embodiment of the present invention, the welding bottom support seat 5-2 is provided with a guardrail 5-3. The guardrail 5-3 is provided at the periphery of the welding bottom guide rail 5-1.

[0064] In this embodiment, the guardrail 5-3 can be used for the safety protection of personnel and provide an interference-free space for welding.

[0065] like Fig.11 As shown, according to an embodiment of the present invention, in addition to the welding head 4-2, the welding module 4 also includes a rolling mechanism 4-3, and the rolling mechanism 4-3 is used to roll the annular seam after welding.

[0066] The welding equipment of this embodiment can roll and level the weld through the rolling mechanism 4-3 after welding is completed.

[0067] Furthermore, the rolling mechanism 4-3 is installed on an electrically driven slider to move closer to or away from the annular seam to be welded.

[0068] The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding device for the annular seam of a stainless steel rocket tank, characterized in that: include: Circumferential seam welding external clamping module and welding module; the circumferential seam welding external clamping module includes a clamping mechanism frame, an external clamping mechanism support column and an external clamping mechanism support base, and the external clamping mechanism support columns are respectively arranged at both ends of the external clamping mechanism support base; the clamping mechanism frame is arranged on the external clamping mechanism support columns, and the external clamping mechanism support columns are used to support the clamping mechanism frame; the clamping mechanism frame is provided with a clamping block, and the clamping block is used to clamp the circumferential seam; the welding module is arranged on the external clamping mechanism support base, and can move relative to the external clamping mechanism support base along the welding direction of the circumferential seam; the welding module includes a welding head, and the welding head is used to weld the circumferential seam.

2. The welding device according to claim 1, characterized in that The external clamping mechanism support base is provided with a base circular arc helical gear guide rail; the welding module also includes a frame base, and the welding head is arranged on the frame base; the lower end surface of the frame base is provided with a driving helical gear mechanism meshing with the base circular arc helical gear guide rail, and the driving helical gear mechanism moves along the base circular arc helical gear guide rail when driven.

3. The welding device according to claim 2, characterized in that: The external clamping mechanism support base is provided with a base rail, and the lower end surface of the frame base is provided with a guide wheel corresponding to the base rail; the guide wheel moves along the base rail to provide guidance for the welding module to move along the circumferential seam welding direction.

4. The welding device according to claim 1, characterized in that: The welding module also includes a frame column; the welding head is installed on the frame column and can slide in multiple directions relative to the frame column.

5. The welding device according to claim 4, characterized in that The frame column is provided with a connecting plate perpendicular thereto; the connecting plate is provided with a radial guide rail, and the welding head is slidably arranged relative to the radial guide rail to approach or move away from the annular seam to be welded.

6. The welding device according to claim 5, characterized in that The frame column is provided with a third screw rod in the vertical direction, and the third screw rod is provided with a third screw rod slider; the connecting plate is connected to the frame column through the third screw rod slider, and the third screw rod slider can be slidably arranged along the axial direction of the third screw rod to adjust the welding height of the welding head.

7. The welding device according to claim 1, characterized in that The welding head is provided with clamping wheels on both sides thereof along the welding direction, and the clamping wheels are used for clamping the edges to be welded.

8. The welding device according to claim 1, characterized in that The clamping mechanism frame is provided with a clamping cylinder, and the clamping block is connected to the clamping mechanism frame via the clamping cylinder; the clamping cylinder drives the clamping block to approach or move away from the annular gap by telescoping.

9. The welding device according to claim 1, characterized in that The outer clamping mechanism support column is provided with a fourth screw rod in the vertical direction; the fourth screw rod is provided with a fourth slider which can slide in the axial direction; the clamping mechanism frame bracket is fixedly connected to the fourth slider, and slides along the fourth screw rod through the fourth slider to adjust the height of the clamping mechanism frame.

10. The welding device according to claim 1, characterized in that It also includes a welding support module; the welding support module includes an annular welding bottom guide rail and a welding bottom support seat, and the welding bottom guide rail is installed on the welding bottom support seat; the external clamping mechanism support base is arranged on the welding bottom support seat, and the lower end surface of the external clamping mechanism support base is provided with a limiting wheel corresponding to the welding bottom guide rail; the limiting wheel is movable along the welding bottom guide rail to drive the welding module to rotate around the circumferential direction of the tank short cylinder.

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