Airplane auxiliary fuel tank flange welding system and method

Abstract

This invention discloses a welding system and method for aircraft auxiliary fuel tank flanges, including a welding positioning device. The welding positioning device includes: a base frame; a reference frame, mounted on the base frame and rotatably connected to it, allowing the reference frame to rotate along its own axis on the base frame; an mounting frame, including a lower frame and an upper frame, the lower frame being slidably connected to the reference frame; an axial limiting mechanism for positioning the auxiliary fuel tank body along the axial direction on the reference frame; and a flange positioning mechanism, including multiple sets of flange positioning assemblies, which are mounted on the reference frame at positions corresponding to each flange, for positioning the flanges in their corresponding assembly positions. By using the flange positioning mechanism on the reference frame to position and connect each flange, the welding position accuracy of the flanges is effectively ensured, and the welding deformation of the flanges can be effectively controlled, thus guaranteeing the welding quality of the flanges.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, specifically relating to a welding system and method for aircraft auxiliary fuel tank flanges. Background Technology

[0002] Aircraft auxiliary fuel tanks are mainly assembled and welded from aluminum alloy cylinders, inner frames, flanges, etc. Due to the requirements of large capacity and light weight, the main components are all thin-walled cylindrical parts. The cylindrical parts are formed by spinning, which results in large dimensional and shape errors, making it impossible to accurately assemble and position the flanges on the outside of the cylinder during welding.

[0003] Currently, during the assembly and welding of tank flanges, mounting holes are typically pre-drilled on the tank body, and the flange is positioned and welded into place. However, welding deformation during the process cannot be effectively controlled, causing the flange interface dimensions to deviate from design requirements. This results in the welded auxiliary fuel tank flange interface being unable to mate with the aircraft interface. The welding quality of the auxiliary fuel tank flange directly affects its assembly on the aircraft; therefore, manual welding is usually employed, which involves high labor intensity and significant fluctuations in weld quality. Summary of the Invention

[0004] The purpose of this invention is to provide a welding system and method for aircraft auxiliary fuel tank flanges, so as to solve the problems of insufficient welding quality and large fluctuations in welding quality of aircraft auxiliary fuel tank flanges.

[0005] This invention is achieved through the following technical solution:

[0006] An aircraft auxiliary fuel tank flange welding system, including a welding positioning device for positioning and clamping the auxiliary fuel tank body and flange, wherein the welding positioning device includes:

[0007] Base frame;

[0008] A reference frame is mounted on the base frame and rotatably connected to the base frame, allowing the reference frame to rotate on the base frame along its own axis.

[0009] The mounting frame includes a lower frame and an upper frame. The lower frame is slidably connected to the reference frame, allowing the lower frame to slide along the axis of the reference frame. When the upper frame is connected to the lower frame, it can clamp and fix the auxiliary oil tank cylinder between the two, and make the axis of the auxiliary oil tank cylinder coincide with the axis of the reference frame.

[0010] An axial limiting mechanism is used to position the auxiliary oil tank body along the axial direction on the reference frame. It includes a first limiting member disposed on the lower frame and a second limiting member disposed on the reference frame. The first limiting member is used to position the first end face of the auxiliary oil tank body, and the second limiting member is used to position the second end face of the auxiliary oil tank body.

[0011] The flange positioning mechanism includes multiple sets of flange positioning components, which are set on a reference frame at positions corresponding to each flange, and are used to position the flanges at their corresponding assembly positions.

[0012] In some embodiments of the present invention, an axial positioning drive mechanism is also included, which drives the mounting frame to slide on the reference frame and fixes the auxiliary oil tank body in the current position when the mounting frame moves to position and engage with the second end face of the auxiliary oil tank body and the second limiting member.

[0013] In some embodiments of the present invention, a first sensing unit is further included. The first sensing unit is used to detect the position of the auxiliary fuel tank body. When the first sensing unit detects that the second end face of the auxiliary fuel tank body is in contact with the second limiting member, the axial positioning drive mechanism is controlled by the welding control system to stop driving the mounting frame.

[0014] In some embodiments of the present invention, the reference frame includes a first frame plate, a second frame plate, and a plurality of guide posts connecting the first frame plate and the second frame plate;

[0015] The lower frame includes multiple lower clamps, and the upper frame includes multiple upper clamps. The upper and lower clamps are connected by connecting rods. The lower clamps are slidably connected to the guide posts. The upper and lower clamps together form a clamp structure that can hold the auxiliary oil tank cylinder tightly.

[0016] In some embodiments of the present invention, a roller assembly is provided on the inner circumferential surface of the lower clamp along its circumferential direction, so that the auxiliary oil tank cylinder installed on the lower frame and the lower frame form a rolling fit.

[0017] In some embodiments of the present invention, the flange positioning assembly includes a base, a two-dimensional displacement stage disposed on the base, and a positioning element disposed on the two-dimensional displacement stage. The two-dimensional displacement stage is capable of adjusting the position of the positioning element along the radial and axial directions of the auxiliary oil tank body. The positioning element is used to form a positioning fit connection with the flange to position the flange at the corresponding position.

[0018] In some embodiments of the present invention, the two-dimensional displacement stage is connected to a welding control system, and the welding control system adjusts the welding parameters according to the displacement of the two-dimensional displacement stage.

[0019] In some embodiments of the present invention, two sets of roller assemblies and a rotation drive mechanism for driving the roller assemblies to rotate are provided on the base frame;

[0020] The first frame plate and the second frame plate are respectively mounted on the roller assembly, and the roller assembly drives the reference frame to rotate.

[0021] On the other hand, the present invention also provides a method for welding an aircraft auxiliary fuel tank flange, which uses the aforementioned aircraft auxiliary fuel tank flange welding system to weld the flange, including the following steps:

[0022] Open the upper frame, hoist the auxiliary fuel tank cylinder onto the lower frame, and position the first end face of the auxiliary fuel tank cylinder in conjunction with the first limiting piece, then close the upper frame;

[0023] The mounting frame is pushed by the axial positioning drive mechanism to make the second end face of the auxiliary oil tank body and the second limiting member position and engage.

[0024] Rotate the auxiliary oil tank body to adjust each flange assembled on the auxiliary oil tank body to the position corresponding to each flange positioning mechanism;

[0025] Connect the upper frame and the lower frame to clamp and fix the auxiliary oil tank cylinder;

[0026] Adjust the position of the positioning elements on each flange positioning mechanism to make the positioning elements and flanges fit together.

[0027] The reference frame is rotated, and the welding robot is controlled by the welding control system to weld the flange.

[0028] In some embodiments of the present invention, the position of the auxiliary oil tank body is detected by the first sensing unit and the detection signal is transmitted to the welding control system. When the first sensing unit detects that the second end face of the auxiliary oil tank body is in contact with the second limiting member, the welding control system controls the axial positioning drive mechanism to stop working.

[0029] And / or, the welding control system acquires the displacement data of the two-dimensional displacement stage of the flange positioning mechanism, and adjusts the welding parameters of the corresponding flange according to the displacement data.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] This invention addresses the structural characteristics of auxiliary fuel tanks by employing an installation frame to position and clamp the auxiliary fuel tank body. Utilizing the sliding fit between the installation frame and a reference frame, a limiting component is installed on the reference frame. One end face of the auxiliary fuel tank body serves as the installation reference for the auxiliary fuel tank and as a reference for the welding position of the flanges on the auxiliary fuel tank. The first limiting component on the installation frame engages with the other end face of the auxiliary fuel tank body to position and install the auxiliary fuel tank body on the reference frame. Using the reference frame as a benchmark, a flange positioning mechanism installed on the reference frame positions and connects each flange, effectively ensuring the welding position accuracy of the flanges and effectively controlling welding deformation, thus guaranteeing the welding quality of the flanges.

[0032] In this invention, the mounting frame is designed to slide on the reference frame, which facilitates the installation of the auxiliary fuel tank body on the reference frame. The assembly accuracy of the auxiliary fuel tank body is ensured by the cooperation between the first limiting member and the second limiting member, and it can better adapt to the machining dimensional errors of the auxiliary fuel tank body in the axial direction.

[0033] This invention employs a flange positioning mechanism with a two-dimensional displacement stage to fine-tune the position of the positioning component, thereby better adapting to deviations in the machining dimensions of the auxiliary oil tank body and the assembly dimensions of the flange. By collecting the data of the fine-tuning displacement, the welding control parameters of the welding control system are adjusted to achieve automated welding operation of the flange and further ensure welding quality. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the welding system structure according to an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the welding system from another perspective, according to an embodiment of the present invention.

[0037] Figure 3 This is a front view of the welding system according to an embodiment of the present invention.

[0038] Figure 4 This is a left view of the welding system according to an embodiment of the present invention.

[0039] Figure 5 This is a right view of the welding system according to an embodiment of the present invention.

[0040] Figure 6 This is a top view of the welding system according to an embodiment of the present invention.

[0041] Figure 7 This is a schematic diagram of the lower frame structure of the mounting frame in the welding system of this invention.

[0042] Figure 8 This is a schematic diagram of the flange positioning assembly in the welding system according to an embodiment of the present invention.

[0043] Figure 9 This is a flowchart of the welding method according to an embodiment of the present invention.

[0044] in:

[0045] 10. Base frame; 11. Roller assembly;

[0046] 20. Base frame; 21. First frame plate; 22. Second frame plate; 23. Guide column;

[0047] 30. Install the frame; 31. Lower frame; 32. Upper frame; 34. Lower clamp; 35. Upper clamp.

[0048] 40. Flange positioning assembly; 41. Base; 42. Two-dimensional displacement stage; 43. Positioning component;

[0049] 51. First limiting component; 52. Second limiting component. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0051] The flanges on aircraft auxiliary fuel tanks are used for interface connection with the aircraft, enabling the installation of the auxiliary fuel tank on the aircraft. Therefore, the welding quality of the flanges directly affects the assembly between the auxiliary fuel tank and the aircraft. Currently, aircraft auxiliary fuel tank flanges are usually welded manually. The welding quality requires a high level of operator skill, and the welding quality is subject to large fluctuations, resulting in high labor intensity.

[0052] To address the aforementioned technical problems, this invention proposes an aircraft auxiliary fuel tank flange welding system. In some embodiments of this invention, the aircraft auxiliary fuel tank flange welding system includes a welding positioning device and a welding control system. The welding positioning device is used for positioning and clamping the auxiliary fuel tank body and flange, and the welding control system is used for controlling the welding robot to achieve automated welding operations of the auxiliary fuel tank.

[0053] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The welding positioning device includes:

[0054] Base frame 10;

[0055] The reference frame 20 is mounted on the base frame 10 and rotatably connected to the base frame, so that the reference frame 20 can rotate on the base frame along its own axis.

[0056] The mounting frame 30 includes a lower frame 31 and an upper frame 32. The lower frame 31 is slidably connected to the reference frame 20, allowing the lower frame to slide along its axial direction on the reference frame. When the upper frame is connected to the lower frame, it can clamp and fix the auxiliary oil tank cylinder between the two, and make the axis of the auxiliary oil tank cylinder coincide with the axis of the reference frame.

[0057] An axial limiting mechanism is used to position the auxiliary oil tank body on the reference frame along the axial direction. It includes a first limiting member 51 set on the lower frame and a second limiting member 52 set on the reference frame. The first limiting member 51 is used to position the first end face of the auxiliary oil tank body, and the second limiting member 52 is used to position the second end face of the auxiliary oil tank body.

[0058] The flange positioning mechanism includes multiple flange positioning assemblies 40, which are set on the reference frame at positions corresponding to each flange and are used to position the flanges at their respective assembly positions.

[0059] The mounting frame 30 adopts a combined structure of an upper frame and a lower frame to firmly hold and fix the auxiliary oil tank cylinder. The lower frame is designed to slide on the reference frame, allowing the entire mounting frame to slide on the reference frame. (Refer to...) Figure 7 .

[0060] Based on the aforementioned sliding fit structure, in order to ensure the installation and positioning accuracy of the auxiliary fuel tank body on the reference frame, a first limiting member is set on the installation frame. The auxiliary fuel tank body is initially positioned by the cooperation between the first limiting member and the auxiliary fuel tank body. A second limiting member is set on the reference frame. The auxiliary fuel tank body is positioned by the cooperation between the second limiting member and the auxiliary fuel tank body. The positioning and installation of the auxiliary fuel tank body on the reference frame can be achieved through the first and second limiting members.

[0061] After the auxiliary oil tank body is installed on the reference frame, each flange pre-assembled on the auxiliary oil tank body corresponds one-to-one with the flange positioning assembly fixed at the corresponding position on the reference frame, and a positioning connection is formed between the flange positioning assembly and the flange pre-assembled on the auxiliary oil tank body.

[0062] In some embodiments, an axial positioning drive mechanism (not shown in the figure) is provided between the reference frame 20 and the mounting frame 30. The axial positioning drive mechanism is used to drive the mounting frame to slide on the reference frame, and when the mounting frame moves to position and engage with the second end face of the auxiliary oil tank body and the second limiting member 52, it can fix the auxiliary oil tank body in the current position.

[0063] The axial positioning drive mechanism can be an electric lead screw, an electric strut, a hydraulic cylinder, or a pneumatic cylinder to realize the sliding movement of the mounting frame on the reference frame and to provide a horizontal pressing force on the mounting frame. This pressing force can effectively fix the position of the auxiliary oil tank body on the reference frame.

[0064] In some embodiments, a first sensing unit is provided on the reference frame 20. The first sensing unit is used to detect the position of the auxiliary oil tank body. When the first sensing unit detects that the second end face of the auxiliary oil tank body is in contact with the second limiting member, the axial positioning drive mechanism is controlled by the welding control system to stop driving the mounting frame.

[0065] The first sensing unit can be a limit switch, photoelectric sensor switch, etc. Taking the limit switch as an example, the limit switch is set at the position corresponding to the second limit member. When the auxiliary oil tank body moves to contact the second limit member, the auxiliary oil tank body touches the limit switch, and the limit switch controls the electric lead screw, electric strut, hydraulic cylinder or pneumatic cylinder to stop the feeding action.

[0066] In some embodiments, the reference frame 20 includes a first frame plate 21, a second frame plate 22, and a plurality of guide posts 23 connecting the first frame plate and the second frame plate;

[0067] The lower frame 31 includes multiple lower clamps 34, and the upper frame 32 includes multiple upper clamps 35. The upper and lower clamps are connected by connecting rods. The lower clamps are slidably connected to the guide posts. The upper and lower clamps together form a clamp structure that can hold the auxiliary oil tank cylinder tightly.

[0068] The upper frame 32 and the lower frame 31 can be connected by a hinge. After the auxiliary oil tank cylinder is installed, the upper frame and the lower frame are fixedly connected by bolts or other locking mechanisms to hold and fix the auxiliary oil tank cylinder.

[0069] In some embodiments, a roller assembly is provided on the inner circumferential surface of the lower clamp 34 along its circumferential direction, so that the auxiliary oil tank cylinder mounted on the lower frame and the lower frame form a rolling fit.

[0070] After the auxiliary oil tank body is installed onto the mounting frame, the circumferential position of the flange relative to the reference frame needs to be adjusted so that the flange and the flange positioning mechanism are aligned circumferentially. At this time, a roller assembly is installed on the lower clamp, and the auxiliary oil tank body contacts the roller assembly to facilitate rotation adjustment of the auxiliary oil tank body after it is installed on the mounting frame. After the flange is adjusted circumferentially, the auxiliary oil tank body can also be fixed by the clamping force of the upper frame and the axial pressing force of the axial positioning drive mechanism.

[0071] In some embodiments, refer to Figure 8The flange positioning assembly includes a base 41, a two-dimensional displacement stage 42 disposed on the base, and a positioning element 43 disposed on the two-dimensional displacement stage. The two-dimensional displacement stage 42 can adjust the position of the positioning element along the radial and axial directions of the auxiliary oil tank body. The positioning element 43 is used to form a positioning fit connection with the flange to position the flange at the corresponding position.

[0072] Reference Figure 3 and Figure 6 The positioning element 43 adopts a structure that matches each flange. It positions the flange by matching with the flange. At the same time, the positioning element can also be connected to the threaded hole on the flange by bolts to achieve a fixed connection with the flange while positioning it, so as to avoid welding deformation of the flange.

[0073] A flange positioning assembly with a two-dimensional displacement stage is used to fine-tune the position of the positioning component, so as to better adapt to the deviations in the machining dimensions of the auxiliary oil tank body and the assembly dimensions of the flange.

[0074] Typically, the positions of each flange positioning component on the reference frame are determined based on the positions of each flange on the auxiliary oil tank body. Therefore, under standard conditions, the positions of the positioning components in the axial and radial directions do not need to be adjusted. Once the auxiliary oil tank body is positioned and installed on the reference frame, it is only necessary to position and connect the positioning components to the corresponding flanges. However, in actual processing, machining errors of the auxiliary oil tank body, assembly errors of the flanges on the auxiliary oil tank body, and cumulative errors can cause certain deviations between the positioning components and the flanges in the axial and radial directions. Here, a two-dimensional displacement stage is used to fine-tune the position of the positioning components to compensate for this deviation. At the same time, this deviation is measured, and the data is used in subsequent processing and assembly to ensure the assembly quality of the auxiliary oil tank.

[0075] In some embodiments, the two-dimensional displacement stage 42 is electrically connected to the welding control system. The welding control system collects the adjustment data of the two-dimensional displacement stage and adjusts the welding parameters according to the displacement of the two-dimensional displacement stage, so as to realize the automated welding operation of the flange.

[0076] The welding control system simultaneously transmits the displacement data of the two-dimensional displacement stage to the host computer. The host computer calculates the installation position deviation of each flange on the auxiliary oil tank based on the displacement data, which is then used for the processing of other components and the assembly of the auxiliary oil tank.

[0077] In some embodiments, two sets of roller assemblies 11 and a rotation drive mechanism for driving the roller assemblies to rotate are provided on the base frame 10; the first frame plate 21 and the second frame plate 22 are respectively fitted on the roller assembly 11, and the reference frame is driven to rotate through the roller assembly.

[0078] During welding operations, the welding control system controls the rotation drive mechanism, which in turn drives the roller assembly to rotate. The rotation drive mechanism can be a motor, a reducer, and a coupling, enabling synchronous driving of two sets of roller assemblies by a single motor.

[0079] Reference Figure 2 The first limiting member 51 includes multiple limiting blocks arranged circumferentially along the lower hoop plate located on the outermost side of the mounting bracket. Similarly, the second limiting member 52 includes multiple limiting blocks arranged circumferentially along the second frame plate. Figure 2 The limiting blocks can be set on an arc-shaped bracket, and the arc-shaped bracket can be set on the lower clamp 34 and the second frame plate 22 respectively. In this way, while ensuring the positioning accuracy of the auxiliary oil tank body, the limiting blocks can be arranged in the circumferential direction, which further improves the positioning accuracy of the auxiliary oil tank body.

[0080] On the other hand, the present invention also provides a method for welding aircraft auxiliary fuel tank flanges, which uses an aircraft auxiliary fuel tank flange welding system to weld the flanges, such as... Figure 9 This includes the following steps:

[0081] Open the upper frame, hoist the auxiliary fuel tank cylinder onto the lower frame, and position the first end face of the auxiliary fuel tank cylinder in conjunction with the first limiting piece, then close the upper frame;

[0082] The mounting frame is pushed by the axial positioning drive mechanism to make the second end face of the auxiliary oil tank body and the second limiting member position and engage.

[0083] Rotate the auxiliary oil tank body to adjust each flange assembled on the auxiliary oil tank body to the position corresponding to each flange positioning mechanism;

[0084] Connect the upper frame and the lower frame to clamp and fix the auxiliary oil tank cylinder;

[0085] Adjust the position of the positioning elements on each flange positioning mechanism to make the positioning elements and flanges fit together.

[0086] The reference frame is rotated, and the welding robot is controlled by the welding control system to weld the flange.

[0087] The position of the auxiliary oil tank body is detected by the first sensing unit, and the detection signal is transmitted to the welding control system. When the first sensing unit detects that the second end face of the auxiliary oil tank body is in contact with the second limiting member, the welding control system controls the axial positioning drive mechanism to stop working.

[0088] The welding control system acquires the displacement data of the two-dimensional displacement stage of the flange positioning mechanism and adjusts the welding parameters of the corresponding flange based on the displacement data.

[0089] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0090] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0091] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method of welding a flange of an auxiliary fuel tank of an aircraft, characterized in that, An aircraft auxiliary fuel tank flange welding system is used to weld the flange. The aircraft auxiliary fuel tank flange welding system includes a welding positioning device for positioning and clamping the auxiliary fuel tank body and the flange. The welding positioning device includes: Base frame; A reference frame is mounted on the base frame and rotatably connected to the base frame, allowing the reference frame to rotate on the base frame along its own axis. The mounting frame includes a lower frame and an upper frame. The lower frame is slidably connected to the reference frame, allowing the lower frame to slide along the axis of the reference frame. When the upper frame is connected to the lower frame, it can clamp and fix the auxiliary oil tank cylinder between the two, and make the axis of the auxiliary oil tank cylinder coincide with the axis of the reference frame. An axial limiting mechanism is used to position the auxiliary oil tank body along the axial direction on the reference frame. It includes a first limiting member disposed on the lower frame and a second limiting member disposed on the reference frame. The first limiting member is used to position the first end face of the auxiliary oil tank body, and the second limiting member is used to position the second end face of the auxiliary oil tank body. A flange positioning mechanism includes multiple flange positioning assemblies, which are positioned on a reference frame at positions corresponding to each flange to position the flanges in their respective assembly locations. Each flange positioning assembly includes a base, a two-dimensional displacement stage mounted on the base, and positioning elements mounted on the two-dimensional displacement stage. The two-dimensional displacement stage can adjust the position of the positioning elements radially and axially along the auxiliary oil tank body. The positioning elements form a positioning fit with the flanges to position them at their corresponding locations. The two-dimensional displacement stage fine-tunes the position of the positioning elements to compensate for axial and radial deviations between the positioning elements and the flanges. This deviation is measured and the data is used for subsequent processing and assembly. The two-dimensional displacement stage is connected to a welding control system, which adjusts the welding parameters based on the displacement of the two-dimensional displacement stage. The welding method for aircraft auxiliary fuel tank flanges includes the following steps: Open the upper frame, hoist the auxiliary fuel tank cylinder onto the lower frame, and position the first end face of the auxiliary fuel tank cylinder in conjunction with the first limiting piece, then close the upper frame; The mounting frame is pushed by the axial positioning drive mechanism to make the second end face of the auxiliary oil tank body and the second limiting member position and engage. Rotate the auxiliary oil tank body to adjust each flange assembled on the auxiliary oil tank body to the position corresponding to each flange positioning mechanism; Connect the upper frame and the lower frame to clamp and fix the auxiliary oil tank cylinder; Adjust the position of the positioning elements on each flange positioning mechanism to make the positioning elements and flanges fit together. The reference frame is rotated, and the welding robot is controlled by the welding control system to weld the flange. The welding control system acquires the displacement data of the two-dimensional displacement stage of the flange positioning mechanism and adjusts the welding parameters of the corresponding flange based on the displacement data.

2. The method of claim 1, wherein, The aircraft auxiliary fuel tank flange welding system also includes an axial positioning drive mechanism for driving the mounting frame to slide on the reference frame and fixing the auxiliary fuel tank body in the current position when the mounting frame moves to position and engage the second end face of the auxiliary fuel tank body with the second limiting member.

3. The method of claim 2, wherein, The aircraft auxiliary fuel tank flange welding system also includes a first sensing unit, which is used to detect the position of the auxiliary fuel tank body. When the first sensing unit detects that the second end face of the auxiliary fuel tank body is in contact with the second limiting member, the welding control system controls the axial positioning drive mechanism to stop driving the mounting frame.

4. The aircraft auxiliary fuel tank flange welding method according to claim 2, characterized in that, The reference frame includes a first frame plate, a second frame plate, and a plurality of guide posts connecting the first frame plate and the second frame plate; The lower frame includes multiple lower clamps, and the upper frame includes multiple upper clamps. The upper and lower clamps are connected by connecting rods. The lower clamps are slidably connected to the guide posts. The upper and lower clamps together form a clamp structure that can hold the auxiliary oil tank cylinder tightly.

5. The method of claim 4, wherein, The lower clamp has a roller assembly arranged circumferentially on its inner circumferential surface, so that the auxiliary oil tank cylinder installed on the lower frame and the lower frame form a rolling fit.

6. The method of claim 4, wherein, Two sets of roller assemblies and a rotation drive mechanism for driving the roller assemblies to rotate are mounted on the base frame; The first frame plate and the second frame plate are respectively mounted on the roller assembly, and the roller assembly drives the reference frame to rotate.

7. The aircraft auxiliary fuel tank flange welding method according to claim 3, characterized in that, The position of the auxiliary oil tank body is detected by the first sensing unit, and the detection signal is transmitted to the welding control system. When the first sensing unit detects that the second end face of the auxiliary oil tank body is in contact with the second limiting member, the welding control system controls the axial positioning drive mechanism to stop working.

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