Welding tool for stainless steel rocket tank end socket

Abstract

The utility model provides a welding tool for a stainless steel rocket tank end socket. The welding tool comprises a scalloped segment rotating supporting assembly, a scalloped segment inner tube, a top cover inner tube, a top cover pressing outer tube and a lifting shaft. The scalloped segment rotary supporting assembly is used for supporting the scalloped segment inner tube and the bottom of the scalloped segment, and the scalloped segment inner tube is used for supporting the inner side face of the scalloped segment; the lifting shaft is arranged in the middle of the scalloped segment rotating and supporting assembly, the top cover inner tube is fixedly arranged on the lifting shaft and used for supporting a top cover, and the top cover pressing outer tube is used for pressing the top cover to the top cover inner tube so as to weld scalloped segment rings and the top cover. According to the welding tool, the welding seam performance can be improved, and the manufacturing process of the elliptical head can be simplified.

Description

Technical Field

[0001] The utility model relates to the field of rocket tanks, in particular to a welding tool for a stainless steel rocket tank head. Background Art

[0002] In the existing large-diameter stainless steel rocket tank manufacturing process, there are several major difficulties in manufacturing stainless steel heads. First, the secondary clamping is difficult to control: the melon slice itself is a stainless steel plate with an elliptical arc shape. The plate is thin and has low rigidity. The secondary clamping is prone to deformation, which causes the gap of the assembly weld to change, resulting in reduced welding accuracy. Second, the dimensional accuracy of the single melon slice and the dimensional accuracy of the melon slice butt welding assembly are high: the stainless steel head is large in size, and the melon slice plate is very thin, so the melon slice shape retention is high. Third, the manufacturing process is complicated. Therefore, the welding of melon slices and heads can usually only be done by online cutting and online welding.

[0003] In order to streamline the manufacturing process of rocket tanks and improve welding accuracy, it is particularly important to design a welding tool for stainless steel rocket tank heads. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a welding tool for a stainless steel rocket tank head.

[0005] The utility model provides a welding tool for a stainless steel rocket tank head, comprising: a melon slice rotating support assembly, a melon slice inner tube, a top cover inner tube, a top cover pressing outer tube and a lifting shaft; the melon slice rotating support assembly is used to support the melon slice inner tube and the bottom of the melon slice, and the melon slice inner tube is used to support the inner side of the melon slice; the lifting shaft is arranged in the middle of the melon slice rotating support assembly, the top cover inner tube is fixedly arranged on the lifting shaft, the top cover inner tube is used to support the top cover, and the top cover pressing outer tube is used to press the top cover to the top cover inner tube, so as to weld the melon slice ring and the top cover.

[0006] According to one embodiment of the utility model, a top cover pressing mechanism is provided along the circumferential direction of the top cover pressing outer tire; the top cover pressing mechanism includes a top cover pressing drive cylinder and a top cover pressing block, and the top cover pressing drive cylinder drives the top cover pressing block toward or away from the top cover by telescoping, so as to press the circumferential side of the top cover to the top cover inner tire or release the top cover.

[0007] According to one embodiment of the present invention, the top cover inner tube is provided with a positioning pin, and the top cover pressing outer tube is provided with a top cover pressing outer tube positioning circular hole corresponding to the positioning pin; the positioning pin cooperates with the top cover pressing outer tube positioning circular hole to position the assembly of the top cover pressing outer tube and the top cover inner tube.

[0008] According to one embodiment of the present invention, the top cover inner tube is provided with a positioning guide column, and the top cover pressing outer tube is provided with a guide positioning circular hole corresponding to the positioning guide column, and the positioning guide column cooperates with the guide positioning circular hole to guide the assembly of the top cover pressing outer tube and the top cover inner tube.

[0009] According to one embodiment of the present invention, a top cover outer tire pressing device is provided in the middle part of the top cover inner tire, and a corresponding pressing device avoidance hole is provided on the top cover pressing outer tire; the top cover outer tire pressing device includes a top cover outer tire pressing drive cylinder and a top cover outer tire pressing block; the top cover outer tire pressing device passes through the pressing device avoidance hole, and the top cover outer tire pressing drive cylinder is extended and retracted to drive the top cover outer tire pressing block toward or away from the top cover pressing outer tire, so as to press the middle part of the top cover pressing outer tire to the top cover inner tire or release the top cover pressing outer tire.

[0010] According to one embodiment of the present invention, below the top cover inner tube, the lifting shaft is provided with a top cover welding back protection module, and the top cover welding back protection module includes a top cover back protection base sleeved on the lifting shaft; near the top cover annular seam, the top cover back protection base is provided with a top cover back gas protection module; the top cover back gas protection module is used to provide protective gas to the top cover annular seam to protect the top cover annular seam during welding.

[0011] According to one embodiment of the present invention, the lifting shaft includes a bottom lifting shaft and a middle screw shaft, and the bottom lifting shaft is a hollow structure; the middle screw shaft is sleeved in the hollow structure, and the middle screw shaft can be lifted and lowered relative to the bottom lifting shaft along the axial direction to drive the top cover inner tube to lift and lower.

[0012] According to one embodiment of the present invention, the top cover back gas protection module includes a top cover back protection support arranged on the top cover back protection base; along the radial direction of the top cover back protection base, the top cover back protection support is provided with a top cover back protection guide rail that can slide relative to it; at the end of the top cover back protection guide rail away from the top cover back protection base, a top cover back gas protection groove is provided, and the top cover back gas protection groove is used to provide protective gas to the top cover annular seam.

[0013] According to one embodiment of the present invention, a top cover back liftable shaft is provided at one end of the top cover back protection guide rail away from the top cover back protection base; the top cover back air protection groove is provided at the top end of the top cover back liftable shaft; the top cover back liftable shaft can move relative to the top cover back protection guide rail along the axial direction of the lifting shaft to drive the top cover back air protection groove toward or away from the top cover annular seam.

[0014] According to one embodiment of the present invention, a spot-welded tensioning wheel is provided at the top end of the liftable shaft on the back side of the top cover; the spot-welded tensioning wheel is used to support the annular seam of the top cover.

[0015] According to the utility model, a welding tool for a stainless steel rocket tank head can control the shape and size of the melon segment and the top cover by first welding the melon segment ring and then butting the top cover with the melon segment ring, thereby streamlining the manufacturing process of the elliptical head.

[0016] It should be understood that the above general description and the following detailed description are merely 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 part of the specification of the present utility model, which illustrate exemplary embodiments of the present utility model. The accompanying drawings and the description of the specification are used to explain the principle of the utility model.

[0018] Figure 1 This is a perspective view of a welding tool for a stainless steel rocket tank head according to an embodiment of the present invention;

[0019] Figure 2 This is a disassembly diagram of a welding tool for a stainless steel rocket tank head according to an embodiment of the present invention;

[0020] Figure 3 This is a three-dimensional diagram of a top cover pressing a tire in one embodiment of the present utility model;

[0021] Figure 4 It is a top view of the top cover pressing the outer tire according to one embodiment of the utility model.

[0022] Figure 5 It is a three-dimensional diagram of a top cover inner tube of one embodiment of the utility model;

[0023] Figure 6 This is a three-dimensional diagram of a top cover tire pressing device according to an embodiment of the present invention;

[0024] Figure 7 This is a disassembly diagram of a welding tool for a stainless steel rocket tank head according to an embodiment of the present invention;

[0025] Figure 8 This is a three-dimensional diagram of a top cover welding back protection module according to an embodiment of the present invention;

[0026] Figure 9 yes Figure 8 Front view of

[0027] Figure 10 This is a three-dimensional diagram of a lifting shaft according to an embodiment of the present invention;

[0028] Figure 11 yes Figure 10 Exploded diagram;

[0029] Figure 12 yes Figure 9 Cross-sectional view in the AA direction.

[0030] Description of reference numerals:

[0031] 1-1 Melon slice inner tube; 1-5 Melon slice rotation support assembly; 1-7 Support leg; 1-8 Top cover pressing outer tube; 1-9 Top cover welding back protection module; 1-12 Top cover inner tube; 1-16 Lifting shaft; 1-8-1 Top cover pressing mechanism; 1-8-2 Reinforcement plate; 1-8-3 Pressing device avoidance hole; 1-8-4 Top cover pressing outer tube positioning hole; 1-8-5 Guide positioning hole; 1-9-1 Top cover back protection outer cylindrical meshing gear; 1-9-2 Top cover back protection base; 1-9-3 Top cover back protection guide rail; 1-9-4 top cover back lifting shaft; 1-9-5 spot welding tensioning wheel; 1-9-6 top cover back air protection groove; 1-9-7 top cover back protection support; 1-12-1 curved inner tube; 1-12-2 positioning pin; 1-12-3 top cover outer tube clamping device; 1-12-4 positioning guide column; 1-12-3-1 top cover outer tube clamping drive cylinder; 1-12-3-2 top cover outer tube clamping block; 1-16-1 bottom lifting shaft; 1-16-2 middle screw shaft. DETAILED DESCRIPTION

[0032] 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 more clear, 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 dimensions of some structural components or areas in the drawings may be enlarged for other structural components or areas to facilitate understanding of the embodiments of the present invention.

[0033] The directional words that appear in the following description refer to the directions shown in the drawings and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise specified, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] In addition, the terms "include", "comprising", "having" or any other variations thereof are intended to cover non-exclusive inclusion, so that a structure or component comprising a series of elements includes not only those elements, but also other mechanical elements not explicitly listed or inherent in the structure or component. In the absence of more limitations, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the article or device comprising the elements.

[0035] Spatially relative terms such as "below," "beneath," "under," "low," "above," "on," "high," and the like are used to facilitate description to explain the positioning of one element relative to a second element, indicating that these terms are intended to encompass different orientations of the device in addition to those shown in the figures. Additionally, for example, "one element is above / below another element" may indicate that the two elements are in direct contact, or may indicate that there are other elements between the two elements. Furthermore, terms such as "first," "second," and the like are also used to describe various elements, regions, portions, and the like, and do not specifically refer to an order or sequence, and should not be considered limiting. Similar terms are used throughout the description to indicate similar elements.

[0036] In the following description of the present invention, in certain scenarios, only the terms "rocket", "carrier rocket", "spacecraft", "space carrier" 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 speaking, the rockets of the present invention include carrier rockets or space carriers used to carry satellites, spacecraft or other probes, as well as 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-mentioned specific terms, those skilled in the art shall not limit the rocket to only one of the carrier rockets or missiles based on the specific words used to describe the scenario, thereby narrowing the scope of protection of the present invention.

[0037] 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 illustrating examples of the present invention.

[0038] Figure 1 This is a perspective view of a welding tool for a stainless steel rocket tank head according to an embodiment of the present invention; Figure 2 This is a disassembly diagram of a welding tool for a stainless steel rocket tank head according to an embodiment of the present invention; Figure 3 This is a three-dimensional diagram of a top cover pressing a tire in one embodiment of the present utility model; Figure 4 It is a top view of the top cover pressing the outer tire according to one embodiment of the utility model. Figure 5It is a three-dimensional diagram of a top cover inner tube of one embodiment of the utility model; Figure 6 This is a three-dimensional diagram of a top cover tire pressing device according to an embodiment of the present invention; Figure 7 This is a disassembly diagram of a welding tool for a stainless steel rocket tank head according to an embodiment of the present invention; Figure 8 This is a three-dimensional diagram of a top cover welding back protection module according to an embodiment of the present invention; Figure 9 yes Figure 8 Front view of Figure 10 This is a three-dimensional diagram of a lifting shaft according to an embodiment of the present invention; Figure 11 yes Figure 10 Exploded diagram; Figure 12 yes Figure 9 Cross-sectional view in the AA direction.

[0039] like Figure 1 and 2 As shown, the utility model provides a welding tool for a stainless steel rocket tank head, comprising: a melon slice rotating support assembly 1-5, a melon slice inner tube 1-1, a top cover inner tube 1-12, a top cover pressing outer tube 1-8, and a lifting shaft 1-16. The melon slice rotating support assembly 1-5 is used to support the melon slice inner tube 1-1 and the bottom of the melon slice, and the melon slice inner tube 1-1 is used to support the inner side of the melon slice. The lifting shaft 1-16 is arranged in the middle of the melon slice rotating support assembly 1-5, the top cover inner tube 1-12 is fixedly arranged on the lifting shaft 1-16, the top cover inner tube 1-12 is used to support the top cover, and the top cover pressing outer tube 1-8 is used to press the top cover to the top cover inner tube 1-12 to weld the melon slice ring and the top cover.

[0040] The welding jig of this embodiment can be applied to the production of elliptical heads by online cutting and online welding (such as laser penetration welding). The welding jig first sequentially cuts and welds several longitudinal seams of the melon petals to manufacture melon petal rings or melon petal segments, then cuts the butt joint edges of the top cover and the melon petal segments, and finally butts the top cover with the melon petal rings to complete the welding of the butt joint seams, thus completing the manufacture of the elliptical head. The welding jig can control the shape and size of the melon petal segments and the top cover, prevent their deformation, improve the weld performance, and simplify the manufacturing process of the elliptical head. In addition, the welding jig can complete the cutting and welding of the melon petals with one clamping, thus avoiding the deformation of the melon petals caused by the secondary clamping of the melon petals.

[0041] In this embodiment, the end surface of the melon segment inner tube 1-1 supporting the melon segment can be an arcuate surface that matches the inner surface of the melon segment. Multiple melon segment inner tubes 1-1 can be provided along the circumference of the melon segment rotation support assembly 1-5, with each melon segment inner tube 1-1 corresponding to each melon segment. For example, for a melon segment ring made by welding 16 melon segments, 16 melon segment inner tubes 1-1 can be provided.

[0042] Furthermore, a plurality of (for example, 16) supporting legs 1-7 are provided along the circumferential direction of the lower end surface of the supporting base 1-6, and the supporting legs 1-7 are used to support the supporting base 1-6.

[0043] like Figure 3 As shown, according to one embodiment of the present invention, a top cover pressing outer tire 1-8 is provided with a top cover pressing mechanism 1-8-1 along its circumferential direction. The top cover pressing mechanism 1-8-1 includes a top cover pressing drive cylinder and a top cover pressing block. The top cover pressing drive cylinder drives the top cover pressing block toward or away from the top cover by telescoping to press the circumferential side of the top cover against the top cover inner tire 1-12 or release the top cover.

[0044] In this embodiment, the top cover pressing outer tire 1-8 can be provided with a plurality of top cover pressing mechanisms 1-8-1 along its circumferential direction. The top cover pressing blocks of the top cover pressing mechanisms 1-8-1 are used to press the end surface of the top cover, and the portion of the top cover pressing blocks used to press the top cover can be arc-shaped to match the top cover.

[0045] like Figure 4 and 5 As shown, according to one embodiment of the present invention, the top cover inner tube 1-12 is provided with a positioning pin 1-12-2, and the top cover pressing outer tube 1-8 is provided with a top cover pressing outer tube positioning circular hole 1-8-4 corresponding to the positioning pin 1-12-2. The positioning pin 1-12-2 cooperates with the top cover pressing outer tube positioning circular hole 1-8-4 to position the assembly of the top cover pressing outer tube 1-8 and the top cover inner tube 1-12.

[0046] The welding tool of this embodiment does not impose specific restrictions on the shapes of the positioning pins 1-12-2 and the top cover pressing the tire positioning circular holes 1-8-4.

[0047] According to one embodiment of the present invention, the top cover inner tube 1-12 is provided with a positioning guide column 1-12-4, and the top cover pressing outer tube 1-8 is provided with a guide positioning circular hole 1-8-5 corresponding to the positioning guide column 1-12-4. The positioning guide column 1-12-4 and the guide positioning circular hole 1-8-5 cooperate to guide the assembly of the top cover pressing outer tube 1-8 and the top cover inner tube 1-12.

[0048] In this embodiment, the guide column 1-12-4 can be set in the middle of the top cover inner tube 1-12.

[0049] like Figure 5 and 6As shown, according to one embodiment of the present invention, a top cover tire pressing device 1-12-3 is provided in the middle of the top cover inner tube 1-12, and a corresponding pressing device avoidance hole 1-8-3 is provided in the top cover pressing outer tube 1-8. The top cover tire pressing device 1-12-3 includes a top cover tire pressing drive cylinder 1-12-3-1 and a top cover tire pressing block 1-12-3-2. The top cover tire pressing device 1-12-3 passes through the pressing device avoidance hole 1-8-3, and the top cover tire pressing drive cylinder 1-12-3-1 is extended and retracted, driving the top cover tire pressing block 1-12-3-2 toward or away from the top cover pressing outer tube 1-8, so as to press the middle of the top cover pressing outer tube 1-8 to the top cover inner tube 1-12 or release the top cover pressing outer tube 1-8.

[0050] In this embodiment, the top cover outer tire pressing device 1-12-3 presses the middle portion of the top cover outer tire 1-8 against the top cover inner tire 1-12, thereby improving the assembly quality, cutting, and welding accuracy of the melon segment and the top cover. Multiple sets of top cover outer tire pressing devices 1-12-3 can be provided along the circumferential direction of the middle portion of the top cover inner tire 1-12. The top cover outer tire pressing device 1-12-3 can be in the form of a rotary drive cylinder. That is, the top cover outer tire 1-8 presses the top cover against the top cover inner tire 1-12. At this time, the top cover outer tire pressing device 1-12-3 penetrates the pressing device avoidance hole 1-8-3, and the top cover outer tire pressing drive cylinder 1-12-3-1 drives the top cover outer tire pressing block 1-12-3-2 to rotate and pull the top cover outer tire pressing block 1-12-3-2 to press the middle portion of the top cover outer tire 1-8. The welding tool can control the shape and dimensional accuracy of the head, thereby improving the welding accuracy of the head.

[0051] According to one embodiment of the present invention, the top cover pressing the outer tire 1-8 is provided with a plurality of (for example, 12) reinforcing plates 1-8-2 along its circumference to reinforce the strength of the top cover pressing the outer tire 1-8.

[0052] like Figure 8 As shown, according to one embodiment of the present utility model, the top cover inner tube 1-12 includes an arc-shaped inner tube 1-12-1 adapted to the side surface of the top cover.

[0053] In this embodiment, for example, the arc-shaped inner tube 1-12-1 can be elliptical.

[0054] like Figure 7 、 8 As shown in Figure 9, according to one embodiment of the present invention, a top cover welding back protection module 1-9 is provided below the top cover inner tube 1-12, on the lifting shaft 1-16. The top cover welding back protection module 1-9 includes a top cover back protection base 1-9-2 that is sleeved on the lifting shaft 1-16. A top cover back gas protection module is provided near the top cover annular seam on the top cover back protection base 1-9-2. The top cover back gas protection module is used to provide shielding gas to the top cover annular seam to protect the top cover annular seam during welding.

[0055] In this embodiment, when the top cover and the melon-shaped ring are welded, the gas shielding module on the back of the top cover can provide protective gas for the weld to prevent the weld from being oxidized and improve the performance of the weld.

[0056] like Figure 10 and 11 As shown, according to one embodiment of the present invention, the lifting shaft 1-16 includes a bottom lifting shaft 1-16-1 and a middle screw shaft 1-16-2. The bottom lifting shaft 1-16-1 is a hollow structure. The middle screw shaft 1-16-2 is sleeved in the hollow structure. The middle screw shaft 1-16-2 can be raised and lowered relative to the bottom lifting shaft 1-16-1 in the axial direction to drive the top cover inner tube 1-12 to rise and fall.

[0057] The welding tool of this embodiment is convenient for welding the melon petal ring and assembling and welding the melon petal ring and the top cover by providing a liftable lifting shaft 1-16.

[0058] like Figure 8 and 12 As shown, according to one embodiment of the present invention, the top cover back gas protection module includes a top cover back protection support 1-9-7 arranged on the top cover back protection base 1-9-2. Along the radial direction of the top cover back protection base 1-9-2, the top cover back protection support 1-9-7 is provided with a top cover back protection guide rail 1-9-3. At the end of the top cover back protection guide rail 1-9-3 away from the top cover back protection base 1-9-2, a top cover back gas protection groove 1-9-6 is provided. The top cover back gas protection groove 1-9-6 is used to provide protective gas to the top cover annular seam.

[0059] In this embodiment, the top cover back-protection guide rail 1-9-3 can be an electrically driven linear guide rail. The top cover back-protection support 1-9-7 can be provided with a back-protection guide groove corresponding to the top cover back-protection guide rail 1-9-3. This welding fixture, through the top cover back-protection guide rail 1-9-3 cooperating with the back-protection guide groove, enables the top cover back-protection guide rail 1-9-3 to slide relative to the top cover back-protection support 1-9-7, which can drive the top cover back-protection groove 1-9-6 toward or away from the cover ring seam, thereby providing shielding gas during welding of the top cover and melon petal ring.

[0060] According to one embodiment of the present invention, a rear liftable top cover shaft 1-9-4 is disposed at the end of the top cover back support rail 1-9-3 away from the top cover back support base 1-9-2. A rear air retaining groove 1-9-6 is disposed at the top of the rear liftable top cover shaft 1-9-4. The rear liftable top cover shaft 1-9-4 can move relative to the rear liftable top cover rail 1-9-3 along the axial direction of the lifting shaft 1-16, thereby moving the rear air retaining groove 1-9-6 toward or away from the top cover annular gap.

[0061] According to one embodiment of the present invention, a spot-welded tensioning wheel 1-9-5 is provided at the top of the liftable shaft 1-9-4 on the back of the top cover. The spot-welded tensioning wheel 1-9-5 is used to support the annular seam of the top cover.

[0062] In this embodiment, spot-welded tension rollers 1-9-5 can support the top cover annular seam during cutting and welding to prevent deformation. Multiple spot-welded tension rollers 1-9-5 can be installed at the top of the liftable shaft 1-9-4 on the back of the top cover. For example, a spot-welded tension roller 1-9-5 can be installed at each end of the air containment groove 1-9-6 on the back of the top cover.

[0063] According to one embodiment of the present invention, the top cover back protection base 1-9-2 includes a top cover back protection base collar and an external cylindrical gear. The top cover back protection base collar is mounted on the lifting shaft 1-16 and is rotatable relative to the lifting shaft 1-16 and the top cover back protection external cylindrical meshing gear 1-9-1. The external cylindrical gear is mounted on the outer side of the top cover back protection base collar and meshes with the top cover back protection external cylindrical meshing gear 1-9-1.

[0064] In this embodiment, the top cover back protection motor is started, and the external cylindrical gear of the driving base drives the top cover back protection base sleeve to rotate around the lifting shaft 1-16.

[0065] The utility model provides a welding tool for a stainless steel rocket tank head, and the related drive cylinder equipment (such as the top cover outer tire pressing drive cylinder 1-12-3-1) can be a pneumatic cylinder, an electric cylinder, etc.

[0066] The above embodiments of the present invention can be combined with each other and have corresponding technical effects.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A welding tool for stainless steel rocket tank heads, characterized in that: include: Melon slice rotating support assembly, melon slice inner tube, top cover inner tube, top cover pressing outer tube and lifting shaft; The melon segment rotating support assembly is used to support the melon segment inner tube and the bottom of the melon segment, and the melon segment inner tube is used to support the inner side of the melon segment; the lifting shaft is arranged in the middle of the melon segment rotating support assembly, the top cover inner tube is fixedly arranged on the lifting shaft, the top cover inner tube is used to support the top cover, and the top cover pressing outer tube is used to press the top cover to the top cover inner tube to weld the melon segment ring and the top cover.

2. The welding tool according to claim 1, characterized in that: The top cover pressing outer tire is provided with a top cover pressing mechanism along its circumferential direction; the top cover pressing mechanism includes a top cover pressing drive cylinder and a top cover pressing block, and the top cover pressing drive cylinder drives the top cover pressing block toward or away from the top cover by telescoping to press the circumferential side of the top cover to the top cover inner tube or release the top cover.

3. The welding tool according to claim 1, characterized in that: The top cover inner tube is provided with a positioning pin, and the top cover pressing outer tube is provided with a top cover pressing outer tube positioning circular hole corresponding to the positioning pin; the positioning pin cooperates with the top cover pressing outer tube positioning circular hole to position the assembly of the top cover pressing outer tube and the top cover inner tube.

4. The welding tool according to claim 1, characterized in that: The top cover inner tube is provided with a positioning guide column, and the top cover pressing outer tube is provided with a guide positioning circular hole corresponding to the positioning guide column. The positioning guide column cooperates with the guide positioning circular hole to guide the assembly of the top cover pressing outer tube and the top cover inner tube.

5. The welding tool according to claim 1, characterized in that: A top cover outer tire pressing device is provided in the middle of the top cover inner tire, and a corresponding pressing device avoidance hole is provided on the top cover pressing outer tire; the top cover outer tire pressing device includes a top cover outer tire pressing drive cylinder and a top cover outer tire pressing block; the top cover outer tire pressing device passes through the pressing device avoidance hole, and the top cover outer tire pressing drive cylinder is extended and retracted to drive the top cover outer tire pressing block toward or away from the top cover pressing outer tire, so as to press the middle of the top cover pressing outer tire to the top cover inner tire or release the top cover pressing outer tire.

6. The welding tool according to claim 1, characterized in that: Below the top cover inner tube, the lifting shaft is provided with a top cover welding back protection module, and the top cover welding back protection module includes a top cover back protection base sleeved on the lifting shaft; near the top cover annular seam, the top cover back protection base is provided with a top cover back gas protection module; the top cover back gas protection module is used to provide protective gas to the top cover annular seam to protect the top cover annular seam during welding.

7. The welding tool according to claim 1, characterized in that: The lifting shaft includes a bottom lifting shaft and a middle screw shaft, and the bottom lifting shaft is a hollow structure; the middle screw shaft is sleeved in the hollow structure, and the middle screw shaft can be lifted and lowered relative to the bottom lifting shaft along the axial direction to drive the top cover inner tube to lift and lower.

8. The welding tool according to claim 6, characterized in that: The top cover back gas protection module includes a top cover back protection support arranged on the top cover back protection base; along the radial direction of the top cover back protection base, the top cover back protection support is provided with a top cover back protection guide rail that can slide relative to it; at the end of the top cover back protection guide rail away from the top cover back protection base, a top cover back gas protection groove is provided, and the top cover back gas protection groove is used to provide protective gas to the top cover annular seam.

9. The welding tool according to claim 8, characterized in that: A top cover back liftable shaft is provided at one end of the top cover back protection guide rail away from the top cover back protection base; the top cover back air protection groove is provided at the top end of the top cover back liftable shaft; the top cover back liftable shaft can move relative to the top cover back protection guide rail along the axial direction of the lifting shaft to drive the top cover back air protection groove toward or away from the top cover annular seam.

10. The welding tool according to claim 9, characterized in that: A spot-welded tensioning wheel is provided at the top end of the liftable shaft on the back side of the top cover; the spot-welded tensioning wheel is used to support the annular seam of the top cover.

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