Special-shaped thin-wall storage tank assembly post-welding machining clamping device and alignment method

Abstract

The invention relates to a special-shaped thin-wall storage tank assembly post-welding machining clamping device and an alignment method, belongs to the technical field of aerospace part machining and manufacturing, and solves the problems of low clamping and alignment efficiency and poor accuracy of a storage tank assembly in the prior art. An adjustable clamping device comprises a front end clamping mechanism and a rear end clamping mechanism. The front end clamping mechanism comprises an upper holding ring, a lower holding ring, a supporting seat and a front base. The supporting seat is slidably mounted in the front base; the front upper embracing ring and the front lower embracing ring can fix the front end of a to-be-clamped workpiece; the lower end of the front lower embracing ring is rotationally installed above the supporting base, and the circumferential angle of the workpiece can be adjusted. The rear end clamping mechanism comprises an upper holding ring, a lower holding ring, a height adjusting assembly and a rear base. The rear lower embracing ring is slidably installed on the rear base, and the installation height can be adjusted through the height adjusting assembly. And the rear upper embracing ring and the rear lower embracing ring can fix the rear end of the workpiece to be clamped. Rapid clamping and coordinate alignment of the storage box assembly are achieved, and the position precision after alignment is high.

Description

Technical Field

[0001] The invention relates to the technical field of aerospace component processing and manufacturing, and in particular to a post-welding machine-mounted clamping device and an alignment method for a special-shaped thin-wall tank assembly. Background Art

[0002] Fuel tank assemblies are usually machined from multiple independent tank parts, then welded together as a whole, and finally the important feature dimensions are machined on the welded tank. The aerospace industry usually has high requirements for the contour accuracy of special-shaped tank assemblies after welding, which generally cannot exceed ±0.5mm, but this accuracy cannot meet the machining requirements. Such components are usually thin-walled, weakly rigid and lightweight structures. Therefore, there will inevitably be a certain amount of deformation after welding, which makes it difficult to match the machining and clamping timing with the theoretical benchmark. Each welding is affected by the combined influence of multiple factors such as the environment, parameters, tooling constraints and part status, resulting in certain differences in the deformation of each set of components after welding. The entire tank often requires extremely high processing accuracy to ensure product quality during machining. Therefore, it is extremely important to determine the benchmark before machining. The mainstream method for this type of component uses a structure with two sets of front and rear bases + a ring. The alignment method is generally to determine the benchmark through the four sets of process reference holes reserved on the front and rear end faces of the box before welding. However, deformation after welding causes the position of the reference holes to deviate from the theoretical position. Therefore, during alignment, the four sets of reference holes are usually adjusted to the closest theoretical position through continuous measurement and adjustment. After each measurement, the position of the tooling needs to be adjusted for alignment. Usually, a wooden hammer is used to hit the position of the tooling base and a shim is used to raise a certain point on the base. This method of clamping and alignment is extremely inefficient. When the component welding deformation is small, it often takes 6-8 hours. If the component welding deformation is large, the time required will be even longer.

[0003] In addition, there are some new methods that add adjustment screws to the bottom and sides of the tooling to facilitate the adjustment of the degrees of freedom in various directions. However, this method cannot limit the degrees of freedom in other directions when adjusting one direction with the screws, causing other directions to move synchronously. The adjustment is still difficult, and the bottom support contact area is small, the support rigidity and stability are poor, which can easily cause vibration during the processing. The clamping method is unreliable and not very practical.

[0004] Therefore, it is necessary to provide an efficient and reliable clamping and alignment method to replace the existing method to achieve fast and accurate clamping and alignment effects. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a machine-mounted clamping device and an alignment method for a post-weld machine-mounted clamping device for a special-shaped thin-walled tank assembly, so as to solve the problems of the existing machine-mounted clamping device for a post-weld machine-mounted tank assembly.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] An adjustable clamping device comprises: a front-end clamping mechanism and a rear-end clamping mechanism;

[0008] The front-end clamping mechanism comprises: a front upper holding ring, a front lower holding ring, a support seat and a front base; the support seat is slidably mounted in a horizontal slide groove of the front base; the front upper holding ring and the front lower holding ring are capable of fixing the front end of the workpiece to be clamped after being fastened together; the lower end of the front lower holding ring is rotatably mounted above the support seat and can be used to adjust the circumferential angle of the workpiece;

[0009] The rear end clamping mechanism includes: a rear lower holding ring, a rear upper holding ring, a height adjustment assembly and a rear base; the rear lower holding ring is slidably mounted on the rear base, and the mounting height can be adjusted by the height adjustment assembly; the rear upper holding ring and the rear lower holding ring are fastened together to fix the rear end of the workpiece to be clamped.

[0010] Furthermore, the front upper holding ring and the front lower holding ring are fastened together by a second fastening screw.

[0011] Furthermore, a horizontal slide groove is provided on the front base, and a sliding key is provided below the support seat, and the sliding key is slidably installed in the horizontal slide groove.

[0012] Furthermore, a lateral top screw is provided on the side of the front base.

[0013] Furthermore, the lateral jack screw is pressed tightly against the side surface of the support seat, and rotating the lateral jack screw can push the support seat to slide horizontally relative to the front base.

[0014] Furthermore, two groups of lateral jack screws are symmetrically arranged on both sides of the front base, and the two groups of lateral jack screws are respectively used to tightly fix the end surfaces of both sides of the support seat.

[0015] Furthermore, an arc-shaped slide rail is provided below the front lower holding ring; and an arc-shaped slide groove is provided on the upper surface of the support seat.

[0016] Furthermore, a locking screw is provided on the front side of the support seat; the locking screw is used to tighten and fix the arc-shaped slide rail.

[0017] Furthermore, a through slot running through the front and back is provided on the main structure of the support seat, and a first fastening screw vertically running through the bottom surface of the support seat is installed in the through slot, and the first fastening screw is used to lock and position the relative position of the support seat and the front base.

[0018] A method for machine-mounted clamping and alignment of a special-shaped thin-walled tank assembly after welding is characterized by using the above-mentioned adjustable clamping device, comprising the following steps:

[0019] Step S1: After the tank assembly is welded, a post-weld 3D model is obtained through 3D scanning and the coordinates of the reference points and the processing reference are determined;

[0020] Step S2: fixing the adjustable clamping device on the workbench and aligning the adjustable clamping device;

[0021] Step S3: clamping the tank assembly through the adjustable clamping device, and measuring and adjusting the reference point coordinates of the tank assembly;

[0022] Step S4: After clamping is completed, the coordinates of the reference points are reviewed to confirm the consistency between the clamping coordinates of each reference point and the actual coordinates after welding.

[0023] The technical solution of the present invention can achieve at least one of the following effects:

[0024] 1. The present invention designs an adjustable clamping device that can finely and evenly adjust the posture of the tank assembly in the clamped state after measuring the coordinates of the reference points of the tank assembly. This replaces the traditional inefficient and violent methods such as hammering, padding and screw adjustment. The adjustment is convenient and reliable. After adjustment, the coordinate position of the tank assembly in the clamped state is accurate, and the position adjustment efficiency is significantly improved.

[0025] 2. The present invention provides a method for clamping and aligning a special-shaped thin-walled tank assembly after welding and before machining, which uses an adjustable clamping device for clamping the tank assembly after welding and before machining. It can combine the three-dimensional laser scanning results after welding to quickly align and determine the processing benchmark.

[0026] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0028] Figure 1 This is a structural diagram of the front-end clamping mechanism of the adjustable clamping device according to Example 1 of the present invention;

[0029] Figure 2 for Figure 1 A longitudinal sectional view of the front end clamping mechanism;

[0030] Figure 3 for Figure 1A transverse cross-sectional view of the front end clamping mechanism;

[0031] Figure 4 This is a structural diagram of the rear end clamping mechanism of the adjustable clamping device according to Example 1 of the present invention;

[0032] Figure 5 for Figure 4 A rear view of the rear end clamping mechanism;

[0033] Figure 6 for Figure 4 A longitudinal sectional view of the rear end clamping mechanism;

[0034] Figure 7 This is a schematic diagram of the coordination between the front lower holding ring and the support seat of the front clamping mechanism;

[0035] Figure 8 Schematic diagram of the matching state of the support seat and the front base of the front clamping mechanism;

[0036] Figure 9 A simplified flow chart of the method for adding clamps and aligning after welding of a special-shaped thin-walled storage tank assembly according to the present invention;

[0037] Figure 10 This is the principle diagram for calculating the actual coordinates of each point in the Z direction of the component (the principle is the same for the Y direction).

[0038] Reference numerals:

[0039] 1-Front upper holding ring; 2-Front lower holding ring; 3-Locking screw; 4-Support seat; 5-Front base; 6-Front handle; 7-Lateral jackscrew; 8-First fastening screw; 9-Second fastening screw; 10-Rear base; 11-Rear lower holding ring; 12-Rear upper holding ring; 13-Bearing; 14-Pinion; 15-Rear handle; 16-Sliding key; 17-Wedge-shaped slider; 18-Top block; 19-Curved slide rail; 20-Curved slide groove; 21-Bump. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0041] Example 1

[0042] A specific embodiment of the present invention discloses an adjustable clamping device, which includes two parts: a front-end clamping mechanism and a rear-end clamping mechanism.

[0043] like Figure 1 、 Figure 2 、 Figure 3As shown, the front-end clamping mechanism includes: a front upper holding ring 1, a front lower holding ring 2, a support seat 4 and a front base 5; the support seat 4 is slidably mounted in the horizontal slide groove of the front base 5; the front upper holding ring 1 and the front lower holding ring 2 are fastened together to fix the front end of the workpiece to be clamped; the lower end of the front lower holding ring 2 is rotatably mounted above the support seat 4 and can be used to adjust the circumferential angle of the workpiece;

[0044] like Figure 4 、 Figure 5 、 Figure 6 As shown, the rear end clamping mechanism includes: a rear lower holding ring 11, a rear upper holding ring 12, a height adjustment assembly and a rear base 10; the rear lower holding ring 11 is slidably mounted on the rear base 10, and the mounting height can be adjusted by the height adjustment assembly; the rear upper holding ring 12 can fix the rear end of the workpiece to be clamped after being fastened to the rear lower holding ring 11.

[0045] Furthermore, if Figure 1 As shown, the front upper holding ring 1 and the front lower holding ring 2 are fastened together by a second fastening screw 9 .

[0046] Furthermore, a horizontal slide groove is provided on the front base 5 , and a slide key 16 is provided below the support seat 4 , and the slide key 16 is slidably installed in the horizontal slide groove.

[0047] Furthermore, a lateral top screw 7 is provided on the side of the front base 5 .

[0048] Furthermore, the lateral jack screw 7 is pressed tightly against the side surface of the support seat 4 , and rotating the lateral jack screw 7 can push the support seat 4 to slide horizontally relative to the front base 5 .

[0049] Furthermore, two groups of lateral jack screws 7 are symmetrically provided on both sides of the front base 5 , and the two groups of lateral jack screws 7 are respectively used to tightly fix the end surfaces of both sides of the support seat 4 .

[0050] In this embodiment, the lateral top screw 7 is rotated to adjust its length extending from the front base 5, so that the sliding key 16 at the bottom of the support base 4 slides in the horizontal keyway of the front base 5, thereby achieving the purpose of adjusting the left and right degrees of freedom of the support base 4 and the clamped tank assembly, and ensuring that the other degrees of freedom are fixed.

[0051] Furthermore, an arc-shaped slide rail 19 is provided below the front lower holding ring 2 ; and an arc-shaped slide groove 20 is provided on the upper surface of the support seat 4 .

[0052] In this embodiment, Figure 2 、 Figure 3 、 Figure 7 、 Figure 8As shown, the front-end clamping mechanism also includes an angle adjustment mechanism; the angle adjustment mechanism includes: a front handle 6, a pinion 14 rotatably installed inside the support seat 4, and an outer gear ring arranged at the bottom of the arc-shaped slide rail 19; the pinion 14 is nested below the arc-shaped slide groove 20 and meshes with the outer gear ring at the bottom of the arc-shaped slide rail 19, and the front handle 6 passes through the support seat 4 and is fixedly connected to the pinion 14.

[0053] During implementation, the rotation angle of the arcuate slide rail 19 is adjusted by the meshing gear set in the angle adjustment mechanism, so that the front lower holding ring 1 of the front end clamping mechanism rotates in a circle in the arcuate slide groove 20 on the support seat 4 through the arcuate slider 19, so as to achieve the purpose of adjusting the circumferential degree of freedom of the tank assembly after clamping, and ensure that other degrees of freedom are fixed.

[0054] Furthermore, a locking screw 3 is provided on the front side of the support base 4; the locking screw 3 is used to tighten and secure the arcuate slide rail 19. After the circumferential angle of the front lower holding ring 1 is adjusted, the locking screw 3 is tightened to clamp and secure the arcuate slide rail 19, restricting the sliding of the arcuate slide rail 19 in the arcuate slide groove 20, thereby locking the position of the front lower holding ring 1 on the support base 4.

[0055] Furthermore, a through slot running through the front and back is provided on the main structure of the support seat 4, and a first fastening screw 8 vertically running through the bottom surface of the support seat 4 is installed in the through slot. The first fastening screw 8 is used to lock and position the relative position of the support seat 4 and the front base 5.

[0056] In this embodiment, Figure 4 、 Figure 5 As shown, the height adjustment mechanism of the rear-end clamping mechanism includes: a rear handle 15, a wedge-shaped slider 17 and a top block 18; specifically, the rear handle 15 is screwed onto the rear base 10 through a thread; the end of the rear handle 15 is rotatably mounted on the top block 18 through a bearing, and the rear handle 15 can be rotated to push the top block 18 to move forward and backward relative to the rear base 10; a wedge-shaped groove is provided on the upper surface of the rear base 10, and the wedge-shaped slider 17 is slidably mounted in the wedge-shaped groove and can slide along the inclined surface of the wedge-shaped groove under the push of the top block 18; specifically, the lower surface of the wedge-shaped slider 17 is an inclined surface, which fits the upper surface of the wedge-shaped groove.

[0057] In this embodiment, rotating the rear handle 15 drives the top block 18 to move forward and backward relative to the rear base 10, which in turn drives the wedge-shaped slider 17 to move forward and backward. Simultaneously, the wedge-shaped slider 17 pushes the rear lower embrace ring 11 to slide relative to the rear base 10. Specifically, the wedge-shaped slider 17 slides along the inclined surface of the wedge-shaped groove and simultaneously pushes the rear lower embrace ring 11 to move up and down relative to the rear base 10, thereby adjusting and aligning the pitch position of the tank assembly.

[0058] Specifically, if Figure 5 As shown, a vertically protruding block 21 is further provided on the rear base 10 , and a threaded hole is provided on the block 21 ; the rear handle 15 is rotatably mounted in the threaded hole of the block 21 through a stud structure.

[0059] Specifically, if Figure 5 、 Figure 6 As shown, the rear lower holding ring 11 is slidably mounted in the vertical keyway of the rear base 10 via a longitudinal sliding key, and is capable of sliding up and down relative to the rear base 10. In this embodiment, the rear handle 15 is rotated to adjust the fore-aft position of the wedge-shaped slider 17, allowing the rear lower holding ring 11 to slide up and down in the vertical keyway of the rear base 10. This allows the holding ring assembly of the rear clamping mechanism to adjust its height while preventing movement in other degrees of freedom. Furthermore, each adjustment can be locked with a screw.

[0060] Example 2

[0061] A specific embodiment of the present invention provides a method for machine-mounted clamping and alignment of a special-shaped thin-walled storage tank assembly after welding, which uses the adjustable clamping device in Example 1 for clamping and alignment.

[0062] In this embodiment, Figure 9 As shown, the post-welding machine clamping and alignment method for the special-shaped thin-walled tank assembly includes the following steps:

[0063] Step S1: After the tank assembly is welded, a post-weld 3D model is obtained through 3D scanning and the coordinates of the reference points and the processing reference are determined;

[0064] Step S2: fixing the adjustable clamping device on the workbench and aligning the adjustable clamping device;

[0065] Step S3: clamping the tank assembly through the adjustable clamping device, and measuring and adjusting the reference point coordinates of the tank assembly;

[0066] Step S4: After clamping is completed, the coordinates of the reference points are reviewed to confirm the consistency between the clamping coordinates of each reference point and the actual coordinates after welding.

[0067] In this embodiment, by performing fitting analysis on the three-dimensional surface scanning data of the tank assembly after welding, the processing reference is determined in advance on the surface data comparison software, and fixed points in various directions are selected as reference points. The coordinates of these points are measured on the scanning software. When aligning on the machine tool, these reference points are adjusted to the same coordinates as the reference points in the software through an adjustable clamping device to achieve alignment after clamping.

[0068] In this embodiment, in step S1, the processing reference of the tank assembly after welding is determined by the following method:

[0069] Step S101: The three-dimensional surface of the tank assembly after welding is obtained by three-dimensional scanning technology to obtain model data, thereby obtaining a three-dimensional model after welding. Specifically, the three-dimensional model of the tank assembly is fitted based on the outer surface, and the overall contour of the fitted model is ensured to be in an optimal state.

[0070] Step S102: Figure 10 As shown, in the 3D scanning software, four reference points in the Z direction, namely the front, rear, left and right, are marked on the 3D model of the tank assembly after welding. The reference points are selected at the four corners of the tank assembly for easy measurement by the machine tool; preferably, the four reference points are symmetrically distributed on the four corners of the assembly.

[0071] Step S103: Displaying the Z-direction deformation of four reference points on the three-dimensional model of the tank assembly after welding on the three-dimensional software; the deformation is the difference between the actual coordinate values ​​of the four reference points after welding and the theoretical coordinate values ​​of the design model;

[0072] Specifically, the deformation amounts of the four reference points are A1, A2, A3, and A4 respectively.

[0073] Furthermore, the theoretical coordinates of the four reference points in the Z direction (height direction) on the measured design model are Z10, Z20, Z30, and Z40; the Z coordinates of these four reference points on the actual tank assembly after welding are: Z1 = Z10 + A1, Z2 = Z20 + A2, Z3 = Z30 + A3, and Z4 = Z40 + A4.

[0074] Step S104: Similarly, repeat steps S102 and S103 to measure the deformations B1, B2, B3, and B4 of the four reference points in the Y direction (horizontal and vertical directions) of the three-dimensional model of the tank assembly after welding. The coordinates of the assembly in the Y direction are: Y1 = Y10 + B1, Y2 = Y20 + B2, Y3 = Y30 + B3, and Y4 = Z40 + B4.

[0075] Step S105: Determine the processing reference in the X direction according to the coordinate values ​​of multiple positioning reference points of the three-dimensional model of the tank assembly after welding and the theoretical margins of the front end and the rear end of the tank assembly.

[0076] Specifically, in step S2, the front base 5 of the front clamping mechanism and the rear base 10 of the rear clamping mechanism are aligned on the workbench, the sides of the adjustable clamping device are leveled, and the front base 5 and the rear base 10 of the adjustable clamping device are pressed using a pressure plate.

[0077] Specifically, in step S3, the coordinates of the tank assembly are adjusted on the adjustable clamping device in the following manner:

[0078] Step S301: Clamp the welded tank assembly onto the machine tool using an adjustable clamping device, use a dial indicator to measure the coordinates of four selected Z-direction reference points on the tank assembly, and compare the measured coordinate values ​​with Z1, Z2, Z3, and Z4 to calculate the difference.

[0079] Step S302: adjusting the clamping states of the front clamping mechanism and the rear clamping mechanism of the adjustable clamping device to adjust the reference point coordinates of the tank assembly in real time;

[0080] Step S303: Adjust the Y and Z references until the deviations from the Y1, Y2, Y3, Y4, and Z1, Z2, Z3, and Z4 coordinates are within ±0.5mm. All degree-of-freedom adjustment mechanisms are locked. Specifically, the front upper and lower rings 1 and 2 are tightened with screws, and the rear upper and lower rings 11 and 12 are tightened with screws. During tightening, the deformation of the meter control assembly must not exceed ±0.5mm.

[0081] Specifically, in step S302, the method for adjusting the reference point coordinates of the tank assembly is:

[0082] Step S3021: Adjust the height direction of the tank assembly by using the wedge-shaped slider 17 of the rear-end clamping mechanism so that the coordinates of the four Z-direction reference points of the tank assembly after adjustment are consistent with the coordinates Z1, Z2, Z3, and Z4;

[0083] Step S3022: Adjust the circumferential angle of the front lower holding ring 2 by adjusting the gear set of the front end clamping mechanism, so that the front lower holding ring 2 rotates in the arc-shaped slide groove 20 of the support seat 4, thereby realizing the precise adjustment of the circumferential rotation direction reference of the tank assembly. After adjusting to the optimal angle, use screws to lock the front lower holding ring 2.

[0084] Step S3023: Adjust the Y-reference of the tank assembly by adjusting the lateral top screws 7 on both sides of the front clamping mechanism, so that the front support seat 4 moves in the front base 5. After adjusting until the Y-reference coordinate of the tank assembly is consistent with Y1, Y2, Y3, and Y4, tighten the first fastening screw 8 to lock the front support seat 4.

[0085] Furthermore, in step S303, the front lower holding ring 2 is locked in the front by tightening the first fastening screw 8.

[0086] Furthermore, in step S4, when the tank assembly is subjected to a benchmark review, it is confirmed that the difference between the coordinates of each benchmark point and Y1, Y2, Y3, Y4 and Z1, Z2, Z3, Z4 does not exceed ±0.5 mm.

[0087] The baseline review includes the following steps:

[0088] Step S401: According to the Z-direction and Y-direction reference coordinates determined above, the zero point coordinates (machining zero point) of the tank assembly are set;

[0089] Step S402: Coordinates of the pin holes reserved on the front and rear surfaces of the tank assembly before welding are reviewed; the difference between the actual coordinates of the pin holes and the theoretical coordinates is calculated to determine the accuracy of the reference coordinates and the machining zero point.

[0090] Step S403: The front and rear end faces of the clamped tank assembly are cut by end trial cutting, and the accuracy of the reference coordinates is verified again by testing the uniformity of the cutting width of the entire circle.

[0091] In this embodiment, after the reference review, if it is determined that the accuracy of the reference coordinates and the zero point coordinates meets the standards, it can be considered that the clamping and alignment of the tank assembly are completed, and subsequent machining operations can be carried out.

[0092] Furthermore, after the tank assembly is clamped and aligned, the X-axis machining datum can be determined based on the X-axis end face margin.

[0093] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. An adjustable clamping device, characterized in that: include: Front-end clamping mechanism and rear-end clamping mechanism; The front-end clamping mechanism comprises: a front upper holding ring (1), a front lower holding ring (2), a support seat (4) and a front base (5); the support seat (4) is slidably mounted in a horizontal slide groove of the front base (5); the front upper holding ring (1) and the front lower holding ring (2) are connected to fix the front end of the workpiece to be clamped; the lower end of the front lower holding ring (2) is rotatably mounted above the support seat (4) and can be used to adjust the circumferential angle of the workpiece; The rear end clamping mechanism comprises: a rear lower holding ring (11), a rear upper holding ring (12), a height adjustment assembly and a rear base (10); the rear lower holding ring (11) is slidably mounted on the rear base (10), and the mounting height can be adjusted by the height adjustment assembly; the rear upper holding ring (12) can fix the rear end of the workpiece to be clamped after being connected to the rear lower holding ring (11).

2. The adjustable clamping device according to claim 1, characterized in that: The front upper holding ring (1) and the front lower holding ring (2) are connected via a second fastening screw (9).

3. The adjustable clamping device according to claim 1, characterized in that: A horizontal slide groove is provided on the front base (5), and a sliding key (16) is provided below the support seat (4), and the sliding key (16) is slidably installed in the horizontal slide groove.

4. The adjustable clamping device according to any one of claims 1 to 3, characterized in that: A lateral top screw (7) is provided on the side of the front base (5).

5. The adjustable clamping device according to claim 4, characterized in that: The lateral top screw (7) is pressed against the side surface of the support seat (4), and rotating the lateral top screw (7) can push the support seat (4) to slide horizontally relative to the front base (5).

6. The adjustable clamping device according to claim 5, characterized in that: Two groups of lateral top screws (7) are symmetrically arranged on both sides of the front base (5), and the two groups of lateral top screws (7) are respectively used to tightly fix the end surfaces of both sides of the support seat (4).

7. The adjustable clamping device according to claim 1, characterized in that: An arc-shaped slide rail (19) is provided below the front lower holding ring (2); and an arc-shaped slide groove (20) is provided on the upper surface of the supporting seat (4).

8. The adjustable clamping device according to claim 7, characterized in that: A locking screw (3) is provided on the front side of the support seat (4); the locking screw (3) is used to tighten and fix the arc-shaped slide rail (19).

9. The adjustable clamping device according to claim 1, characterized in that: A through slot extending frontward and rearward is provided on the main structure of the support seat (4), and a first fastening screw (8) vertically extending through the bottom surface of the support seat (4) is installed in the through slot. The first fastening screw (8) is used to lock and position the relative position of the support seat (4) and the front base (5).

10. A method for aligning a special-shaped thin-walled tank assembly after welding, characterized in that: The adjustable clamping device according to any one of claims 1 to 9 comprises the following steps: Step S1: After the tank assembly is welded, a post-weld 3D model is obtained through 3D scanning and the coordinates of the reference points and the processing reference are determined; Step S2: fixing the adjustable clamping device on the workbench and aligning the adjustable clamping device; Step S3: clamping the tank assembly through the adjustable clamping device, and measuring and adjusting the reference point coordinates of the tank assembly; Step S4: After clamping is completed, the coordinates of the reference points are reviewed to confirm the consistency between the clamping coordinates of each reference point and the actual coordinates after welding.

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