External pressure tooling for stainless steel tank welding

Abstract

The utility model provides a kind of outer pressure tool for stainless steel storage tank welding, comprising: outer pressure stand, outer pressure base and outer pressure wheel, the outer pressure base is used to support the outer pressure stand;The outer pressure base is used to place in the external of storage tank short cylinder radial direction;The side surface of the outer pressure stand is provided with the first outer pressure support extending along the radial direction of storage tank short cylinder, the outer pressure wheel is connected with the first outer pressure support by second outer pressure support, and the outer pressure wheel is rotatably arranged relative to the second outer pressure support;The second outer pressure support is movably arranged relative to the first outer pressure support along the radial direction of storage tank short cylinder, to drive the outer pressure wheel towards or away from the butt joint ring seam of storage tank short cylinder;The outer pressure base is rotatably arranged along the circumferential direction of short cylinder, to drive the outer pressure wheel moves along the butt joint ring seam of short cylinder, and the butt joint ring seam of short cylinder is compressed tightly.The outer pressure tool can adapt to the outer pressure support of different sizes of stainless steel short cylinder, and improve the versatility of tool.

Description

[0001] This application claims priority to application number 202520311332.5 entitled "A welding device for stainless steel storage tanks", the contents of which are incorporated herein by reference in their entirety. Technical Field

[0002] This utility model relates to the field of tooling for launch vehicle storage tanks, specifically to an external pressure tooling for welding stainless steel storage tanks. Background Technology

[0003] Stainless steel possesses properties such as high strength, corrosion resistance, and high-temperature resistance. The extensive use of stainless steel in Starship rockets not only reduces overall manufacturing costs but also allows the rocket to withstand the extreme temperatures of launch. Furthermore, stainless steel is relatively simple to process and requires less technical expertise. Rocket propellant tanks are crucial components for storing propellant. They are relatively large and typically consist of multiple short cylinders welded together with a head via circumferential seams. When welding the circumferential seams between short cylinders and between a short cylinder and the head, internal and external supports are usually required to ensure the weld shape and precision.

[0004] To complement existing internal support components and adapt to the internal and external pressure support of stainless steel rocket propellant tanks of different sizes, it is particularly important to design an external pressure tooling for welding stainless steel propellant tanks. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an external pressure tooling for welding stainless steel storage tanks.

[0006] This utility model provides an external pressure fixture for welding stainless steel storage tanks, comprising: an external pressure column, an external pressure base, and an external pressure wheel. The external pressure base supports the external pressure column and is placed outside the short cylinder of the storage tank in the radial direction. A first external pressure bracket extending radially from the side of the external pressure column is provided, and the external pressure wheel is connected to the first external pressure bracket via a second external pressure bracket. The external pressure wheel is rotatably disposed relative to the second external pressure bracket. The second external pressure bracket is movable relative to the first external pressure bracket in the radial direction of the short cylinder of the storage tank to drive the external pressure wheel toward or away from the joint circumferential seam of the short cylinder. The external pressure base is rotatably disposed in the circumferential direction of the short cylinder to drive the external pressure wheel to move along the joint circumferential seam of the short cylinder, thereby pressing the joint circumferential seam of the short cylinder.

[0007] According to one embodiment of the present invention, it further includes an external pressure sliding track; the external pressure sliding track is used to be placed on the radial side of the short cylinder of the storage tank; the external pressure base is movable relative to the external pressure sliding track.

[0008] According to one embodiment of the present invention, it further includes an external pressure guide rail; the external pressure guide rail is disposed radially outside the external pressure sliding rail; two guide wheels are disposed on the lower side of the external pressure base, the two guide wheels are respectively used to be placed on both sides of the external pressure guide rail, and the guide wheels are movably disposed relative to the external pressure guide rail to radially limit the external pressure base.

[0009] According to one embodiment of the present invention, an external pressure motor and an external pressure drive gear are provided on the lower side of the external pressure base, and the external pressure motor is fixedly connected to the external pressure drive gear; the external pressure drive gear is meshed with the external pressure sliding track; when the external pressure motor is started, it drives the external pressure drive gear to move the external pressure base along the external pressure sliding track.

[0010] According to one embodiment of the present invention, the external pressure column is provided with two symmetrical external pressure wheels along its height direction, which are used to press on both sides of the short cylinder butt joint circumferential seam respectively.

[0011] According to one embodiment of the present invention, a welding component is further provided on the side of the external pressure column, and the welding component includes a welding head.

[0012] According to one embodiment of the present invention, along the circumferential direction of the external pressure sliding track, the external pressure base is provided with a first external pressure column and a second external pressure column; an external pressure support rod is provided between the first external pressure column and the second external pressure column; the external pressure wheel and the welding component are provided on the side of the external pressure support rod; the external pressure support rod is movable along the height direction of the external pressure column, driving the welding component to move up and down to adapt to the height of the short cylinder butt joint circumferential seam.

[0013] According to one embodiment of the present invention, vertical tracks are provided on the opposite sides of the first external pressure column and the second external pressure column along their height direction, and grooves adapted to the vertical tracks are provided on both ends of the external pressure support rod; the external pressure support rod is movable relative to the vertical tracks through the grooves to adjust its height.

[0014] According to one embodiment of the present invention, the welding component further includes a Z-axis slider; a welding slide bar is provided on the outer side of the external pressure support rod; the welding head is disposed on the Z-axis slider, and the Z-axis slider is movable relative to the welding slide bar along the height direction of the welding slide bar to finely adjust the height of the welding head; the welding component further includes an X-axis slider; the welding head is disposed on the X-axis slider; the X-axis slider is disposed on the Z-axis slider, and the X-axis slider is movable relative to the Z-axis slider along the radial direction of the external pressure sliding track to drive the welding head of the external pressure sliding track closer to or away from the short cylinder butt joint circumferential seam.

[0015] According to one embodiment of the present invention, a rolling roller is respectively provided on both sides of the welding head in the horizontal direction of the welding slide to roll the short cylinder butt joint circumferential seam to be welded and the short cylinder butt joint circumferential seam that has been welded.

[0016] The external pressure fixture for welding stainless steel storage tanks according to this utility model, by setting an external pressure wheel that can be radially telescopic and rotatable, can adapt to stainless steel short cylinders of different sizes, and presses the stainless steel short cylinders from the outer side in conjunction with existing internal support components, thereby improving the versatility of the external pressure fixture.

[0017] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the present invention. Attached Figure Description

[0018] The accompanying drawings are part of the specification of this utility model and illustrate exemplary embodiments of the utility model. The drawings, together with the description in the specification, are used to illustrate the principles of the utility model.

[0019] Figure 1 This is a perspective view of an external pressure tool for welding stainless steel storage tanks according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Enlarged view of A in the middle;

[0021] Figure 3 This is a bottom view of the external pressure base according to an embodiment of the present invention;

[0022] Figure 4 This is a perspective view of an external pressure tool for welding stainless steel storage tanks, according to another embodiment of this utility model.

[0023] Figure 5 This is a perspective view of a welding component according to an embodiment of the present invention;

[0024] Figure 6 This is a perspective view of an external pressure tool for welding stainless steel storage tanks according to an embodiment of the present invention;

[0025] Figure 7 yes Figure 6 Enlarged view of B in the middle;

[0026] Figure 8 This is a perspective view of a welding component according to an embodiment of the present invention;

[0027] Figure 9 This is a perspective view of an external pressure tooling for welding stainless steel storage tanks according to another embodiment of the present invention;

[0028] Figure 10This is a perspective view of an external pressure fixture for welding stainless steel storage tanks, which is another embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 2. External pressure fixture; 3. Welding components; 2.1 External pressure column; 2.2 External pressure base; 2.3 External pressure wheel; 2.4 External pressure guide rail; 2.5 External pressure sliding rail; 2.6 Guide wheel; 2.7 External pressure drive gear; 2.8 External pressure support rod; 2.9 First external pressure bracket; 2.10 Second external pressure bracket; 2.1.1 First external pressure column; 2.1.2 Second external pressure column; 3.1 Welding head; 3.2 Welding slide bar; 3.3 Z-axis slider; 3.4 X-axis slider; 3.5 Y-axis slider; 3.6 Rolling wheel; 4.1 First storage tank short cylinder; 4.2 Second storage tank short cylinder. Detailed Implementation

[0031] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.

[0032] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0034] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience 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 those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0035] In the following description of this utility model, the terms "rocket," "launch vehicle," "spacecraft," "space launch vehicle," or "missile" may be used in certain scenarios for ease of description only, and their connotations are not limited to the specific terms used. Generally, the launch vehicle of this utility model includes space launch vehicles or rockets used to launch satellites, spacecraft, or other probes, as well as various missiles, rockets, and similar products capable of delivering payloads into the air, used to carry military payloads. Those skilled in the art, when interpreting the above specific terms, should not limit the launch vehicle to only one type of rocket or missile based on the specific terms used in the description, thereby narrowing the scope of protection of this utility model.

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

[0037] Figure 1 This is a perspective view of an external pressure tool for welding stainless steel storage tanks according to an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of A in the middle; Figure 3 This is a bottom view of the external pressure base according to an embodiment of the present invention; Figure 4 This is a perspective view of an external pressure tool for welding stainless steel storage tanks, according to another embodiment of this utility model. Figure 5 This is a perspective view of a welding component according to an embodiment of the present invention; Figure 6 This is a perspective view of an external pressure tool for welding stainless steel storage tanks according to an embodiment of the present invention; Figure 7 yes Figure 6 Enlarged view of B in the middle; Figure 8 This is a perspective view of a welding component according to an embodiment of the present invention; Figure 9 This is a perspective view of an external pressure tooling for welding stainless steel storage tanks according to another embodiment of the present invention; Figure 10This is a perspective view of an external pressure fixture for welding stainless steel storage tanks, which is another embodiment of this utility model.

[0038] like Figure 1 and 2 As shown, this utility model provides an external pressure fixture 2 for welding stainless steel storage tanks, including: an external pressure column 2.1, an external pressure base 2.2, and an external pressure wheel 2.3. The external pressure base 2.2 supports the external pressure column 2.1. The external pressure base 2.2 is placed on the outside of the short cylinder of the storage tank in the radial direction. A first external pressure bracket 2.9 extending radially along the short cylinder of the storage tank is provided on the side of the external pressure column 2.1. The external pressure wheel 2.3 is connected to the first external pressure bracket 2.9 via a second external pressure bracket 2.10, and the external pressure wheel 2.3 is rotatably disposed relative to the second external pressure bracket 2.10. The second external pressure bracket 2.10 is movable relative to the first external pressure bracket 2.9 in the radial direction of the short cylinder of the storage tank, so as to drive the external pressure wheel 2.3 toward or away from the butt joint circumferential seam of the short cylinder. The external pressure base 2.2 is rotatably disposed in the circumferential direction of the short cylinder, so as to drive the external pressure wheel 2.3 to move along the butt joint circumferential seam of the short cylinder, thereby pressing the butt joint circumferential seam of the short cylinder.

[0039] In this embodiment, as Figure 10 As shown, the first short cylinder 4.1 and the second short cylinder 4.2 of the storage tank are axially connected. An internal support component can be placed on the inner side of the short cylinder in the radial direction. For example, in a welding system for the outer stringers of a stainless steel rocket storage tank section (application number CN202510135725.X), the circular base 2-1-4-1 of the supporting component 2-1 is provided with multiple internal support mechanisms 2-1-4-3, which can support the cylinder section from the inside. The external pressure fixture 2 is placed on the outer side of the short cylinder in the radial direction. The inner support mechanism 2-1-4-3 expands the short cylinder of the storage tank from within, creating a circular shape. Due to the static friction between the inner support mechanism 2-1-4-3 and the inner wall of the short cylinder, when the inner support mechanism 2-1-4-3 is stationary, the short cylinder is also stationary. The outer pressure base 2.2 of the outer pressure fixture 2 can rotate circumferentially around the short cylinder, driving the outer pressure wheel 2.3 to move along the short cylinder's mating circumferential seam, cooperating with the aforementioned expanding component 2-1 to press the short cylinder's mating circumferential seam. When the inner support mechanism 2-1-4-3 rotates, the short cylinder rotates accordingly. At this time, the outer pressure fixture 2 can remain stationary, cooperating with the aforementioned expanding component 2-1 to press the short cylinder's mating circumferential seam along its circumferential direction. This allows welding equipment (e.g., laser welding equipment) to weld the mating circumferential seam.

[0040] This external pressure fixture, with its rotatable external pressure roller 2.3, can accommodate stainless steel short cylinders of different sizes, pressing them from the outside, thus improving the versatility of the external pressure fixture. For example, the external pressure roller 2.3 is rotatably mounted relative to the external pressure column 2.1 in a horizontal plane, allowing it to move along the circumferential direction of the short cylinder's joint seam and press the entire joint. Alternatively, this external pressure fixture can cooperate with internal support components or equipment placed inside the short cylinder of the propellant tank to press and fix the joint seam from both the outer and inner sides of the short cylinder, facilitating welding and improving welding accuracy and the reliability of the rocket propellant tank.

[0041] According to one embodiment of the present invention, the outer pressure roller 2.3 is equipped with a pressure sensor, which is used to measure the pressure applied by the outer pressure roller 2.3 to the outer side of the short cylinder, so as to control the degree of deformation at the joint seam of the short cylinder, thereby controlling the shape accuracy of the short cylinder.

[0042] In this embodiment, the position of the second external pressure bracket 2.10 relative to the first external pressure bracket 2.9 can be adjusted by the value of the pressure sensor, so as to adjust the pressure applied by the external pressure wheel 2.3 to the short cylinder.

[0043] like Figure 1 As shown, according to one embodiment of the present invention, in addition to the external pressure column 2.1 and the external pressure base 2.2, the external pressure fixture also includes an external pressure sliding rail 2.5. The external pressure sliding rail 2.5 is used to be placed on the radially outer side of the short cylinder of the storage tank. The external pressure base 2.2 is movably disposed relative to the external pressure sliding rail 2.5.

[0044] In this embodiment, the external pressure base 2.2 is movably arranged relative to the external pressure sliding track 2.5, which can drive the external pressure wheel 2.3 to move along the circumferential direction of the tank short cylinder docking ring seam to press the entire tank short cylinder docking ring seam.

[0045] like Figure 1 and 3 As shown, according to one embodiment of this utility model, in addition to the external pressure column 2.1, the external pressure base 2.2, and the external pressure sliding rail 2.5, the external pressure fixture also includes an external pressure guide rail 2.4. The external pressure guide rail 2.4 is located radially outside the external pressure sliding rail 2.5. Two guide wheels 2.6 are provided on the lower side of the external pressure base 2.2. The two guide wheels 2.6 are respectively placed on both sides of the external pressure guide rail 2.4. The guide wheels 2.6 are movable relative to the external pressure guide rail 2.4 to radially limit the external pressure base 2.2.

[0046] In this embodiment, the guide wheel 2.6 is rotatably configured to move along the external pressure guide rail 2.4.

[0047] like Figure 3As shown, according to one embodiment of the present invention, an external pressure motor and an external pressure drive gear 2.7 are provided on the lower side of the external pressure base 2.2, and the external pressure motor and the external pressure drive gear 2.7 are fixedly connected. The external pressure drive gear 2.7 is meshed with the external pressure sliding rail 2.5. When the external pressure motor is started, it drives the external pressure drive gear 2.7 to move the external pressure base 2.2 along the external pressure sliding rail 2.5.

[0048] In this embodiment, for example, the external pressure motor can be a stepper motor.

[0049] like Figure 2 As shown, according to one embodiment of the present invention, the external pressure column 2.1 is provided with two symmetrical external pressure wheels 2.3 along its height direction, which are used to press on both sides of the short cylinder docking circumferential seam respectively.

[0050] In this embodiment, for example, two short cylinders are connected, and two external pressure rollers 2.3 are respectively set for one of the short cylinders.

[0051] like Figure 4 and 5 As shown, according to one embodiment of the present invention, a welding component 3 is also provided on the side of the external pressure column 2.1, and the welding component 3 includes a welding head 3.1.

[0052] In this embodiment, the external pressure column 2.1 can drive the welding head 3.1 and the external pressure roller 2.3 to move synchronously along the circumferential direction of the short cylinder butt joint circumferential seam to weld the entire butt joint circumferential seam. For example, the welding head 3.1 can be positioned between two external pressure rollers 2.3 to weld the short cylinder butt joint circumferential seam.

[0053] like Figure 6 and 7 As shown, according to one embodiment of the present invention, along the circumferential direction of the external pressure sliding track 2.5, the external pressure base 2.2 is provided with a first external pressure column 2.1.1 and a second external pressure column 2.1.2. An external pressure support rod 2.8 is provided between the first external pressure column 2.1.1 and the second external pressure column 2.1.2. An external pressure wheel 2.3 and a welding component 3 are provided on the side of the external pressure support rod 2.8. The external pressure support rod 2.8 is movable along the height direction of the external pressure column 2.1, driving the welding component 3 to move up and down to adapt to the height of the short cylinder butt joint circumferential seam.

[0054] The external pressure fixture provided in this embodiment can be adjusted by changing the height of the short cylinder butt joint circumferential seam through the external pressure support rod 2.8 to adapt to different short cylinder butt joint circumferential seam heights.

[0055] According to one embodiment of this utility model, vertical tracks are provided along the height direction on the opposite sides of the first external pressure column 2.1.1 and the second external pressure column 2.1.2, and grooves adapted to the vertical tracks are provided on both ends of the external pressure support rod 2.8. The external pressure support rod 2.8 is movable relative to the vertical tracks through the grooves to adjust its height.

[0056] Furthermore, toothed tracks are provided along the height direction on the opposite sides of the first external pressure column 2.1.1 and the second external pressure column 2.1.2, and these toothed tracks are located on the outer side of the external pressure support rod 2.8. A rotatable height-adjusting gear is provided on the side of the external pressure support rod 2.8 opposite to the toothed track, and the height-adjusting gear meshes with the toothed track. The height-adjusting gear is connected to a height-adjusting motor. When the height-adjusting motor is activated, it drives the height-adjusting gear to move along the toothed track to adjust the height of the external pressure support rod 2.8.

[0057] like Figure 7 and 8 As shown, according to one embodiment of the present invention, a welding slide bar 3.2 is provided on the outer side of the external pressure support rod 2.8. A welding head 3.1 is provided on the Z-axis slider 3.3, which is movable relative to the welding slide bar 3.2 along the height direction of the welding slide bar 3.2 to finely adjust the height of the welding head 3.1.

[0058] like Figure 8 As shown, according to one embodiment of the present invention, in addition to the welding head 3.1, the welding component 3 also includes an X-axis slider 3.4. The welding head 3.1 is disposed on the X-axis slider 3.4. The X-axis slider 3.4 is disposed on the Z-axis slider 3.3, and the X-axis slider 3.4 is movable relative to the Z-axis slider 3.3 in the radial direction of the external pressure sliding track 2.5, so as to drive the welding head 3.1 to approach or move away from the short cylinder butt joint circumferential seam.

[0059] The external pressure fixture provided in this embodiment can adapt to the welding of circumferential seams of storage tanks of different sizes by moving the X-axis slider 3.4 relative to the Z-axis slider 3.3 in the radial direction of the external pressure sliding track 2.5.

[0060] According to one embodiment of the present invention, in addition to the X-axis slider 3.4, the welding component 3 also includes a Y-axis slider 3.5. A welding head 3.1 is disposed on the Y-axis slider 3.5. The Y-axis slider 3.5 is disposed on the X-axis slider 3.4, and the Y-axis slider 3.5 is movable relative to the X-axis slider 3.4 along the circumferential direction of the external pressure sliding track 2.5, so as to finely adjust the position of the welding head 3.1 along the circumferential direction of the short cylinder butt joint circumferential seam.

[0061] like Figure 9As shown, according to one embodiment of the present invention, a rolling wheel 3.6 is respectively provided on both sides of the welding head 3.1 in the horizontal direction of the welding slide bar 3.2 to roll the short cylinder butt joint circumferential seam to be welded and the short cylinder butt joint circumferential seam that has been welded.

[0062] In this embodiment, when the welding head 3.1 welds along the circumferential direction of the short cylinder butt joint circumferential seam, the rolling roller in front of the welding head 3.1 is used to roll and flatten the short cylinder butt joint circumferential seam to be welded in the direction of travel of the welding head 3.1, thereby improving the welding accuracy and the shape accuracy of the tank. The rolling roller behind the welding head 3.1 is used to roll and flatten the welded short cylinder butt joint circumferential seam to further improve the welding accuracy and the shape accuracy of the tank.

[0063] The above embodiments of this utility model can be combined with each other and have corresponding technical effects.

[0064] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An external pressure tooling for welding stainless steel storage tanks, characterized in that, The device includes an external pressure column, an external pressure base, and an external pressure wheel. The external pressure base supports the external pressure column and is placed on the outside of the short cylinder of the storage tank in the radial direction. A first external pressure bracket extending radially from the side of the external pressure column is provided, and the external pressure wheel is connected to the first external pressure bracket via a second external pressure bracket. The external pressure wheel is rotatably disposed relative to the second external pressure bracket. The second external pressure bracket is movable relative to the first external pressure bracket in the radial direction of the short cylinder of the storage tank to drive the external pressure wheel toward or away from the docking circumferential seam of the short cylinder of the storage tank. The external pressure base is rotatably disposed in the circumferential direction of the short cylinder to drive the external pressure wheel to move along the docking circumferential seam of the short cylinder and press the docking circumferential seam of the short cylinder.

2. The external pressure tooling according to claim 1, characterized in that, It also includes an external pressure sliding track; the external pressure sliding track is used to be placed on the radial side of the short cylinder of the storage tank; the external pressure base is movable relative to the external pressure sliding track.

3. The external pressure tooling according to claim 2, characterized in that, It also includes an external pressure guide rail; the external pressure guide rail is arranged radially outside the external pressure sliding rail; two guide wheels are arranged on the lower side of the external pressure base, and the two guide wheels are respectively used to be placed on both sides of the external pressure guide rail. The guide wheels are movably arranged relative to the external pressure guide rail to radially limit the external pressure base.

4. The external pressure tooling according to claim 2, characterized in that, An external pressure motor and an external pressure drive gear are provided on the lower side of the external pressure base. The external pressure motor and the external pressure drive gear are fixedly connected. The external pressure drive gear is meshed with the external pressure sliding track. When the external pressure motor is started, it drives the external pressure drive gear to move the external pressure base along the external pressure sliding track.

5. The external pressure fixture according to claim 1, characterized in that, The external pressure column is provided with two symmetrical external pressure rollers along its height direction, which are used to press on both sides of the short cylinder butt joint circumferential seam.

6. The external pressure tooling according to claim 2, characterized in that, The side of the external pressure column is also provided with welding components, which include welding heads.

7. The external pressure tooling according to claim 6, characterized in that, Along the circumferential direction of the external pressure sliding track, the external pressure base is provided with a first external pressure column and a second external pressure column; an external pressure support rod is provided between the first external pressure column and the second external pressure column; the external pressure wheel and the welding component are provided on the side of the external pressure support rod; the external pressure support rod is movable along the height direction of the external pressure column, driving the welding component to move up and down to adapt to the height of the short cylinder butt joint circumferential seam.

8. The external pressure tooling according to claim 7, characterized in that, The first and second external pressure columns have vertical tracks on their opposite sides along their height direction. The two ends of the external pressure support rod have grooves that fit the vertical tracks. The external pressure support rod is movable relative to the vertical tracks through the grooves to adjust its height.

9. The external pressure tooling according to claim 7, characterized in that, The welding component also includes a Z-axis slider; a welding slide bar is provided on the outer side of the external pressure support rod; the welding head is disposed on the Z-axis slider, and the Z-axis slider is movable relative to the welding slide bar along the height direction of the welding slide bar to finely adjust the height of the welding head; The welding component also includes an X-axis slider; the welding head is disposed on the X-axis slider; the X-axis slider is disposed on the Z-axis slider, and the X-axis slider is movable relative to the Z-axis slider along the radial direction of the external pressure sliding track to drive the welding head of the external pressure sliding track to approach or move away from the short cylinder butt joint circumferential seam.

10. The external pressure tooling according to claim 9, characterized in that, The welding slide bar is equipped with a rolling roller on each side of the welding head in the horizontal direction to roll the short cylinder butt joint circumferential seam to be welded and the short cylinder butt joint circumferential seam that has already been welded.

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