A method for integrally assembling and welding a barrel wall of an aircraft fuel tank

Abstract

The present application relates to a kind of aviation oil tank barrel wall integration and is installed welding method, belong to the production technical field of multiple cabin section oil tank, solve the problem of long production cycle, welding precision low in the welding assembly process of multiple cabin section oil tank.The welding method of the present application includes the following steps: step S1: install circular hoop on the outside of multiple section cylindrical workpiece to be clamped and positioned;Step S2: the circular hoop is hoisted to the roller support mechanism and is supported;Step S3: by axial series of compacting mechanism, multiple groups of circular hoop and cylindrical workpiece are axially compacted and connected, and two ends are compacted by tail top flange assembly and rotating flange assembly;Step S4: the rotating flange assembly drives multiple section cylindrical workpiece to rotate synchronously in circumferential direction, and then rotating welding is carried out by welding equipment.The present application realizes the synchronous compacting and integrated welding of the cylindrical workpiece of multiple cabin section, and then the process flow can be simplified, the production efficiency of product is improved, and the construction period is shortened.

Description

Technical Field

[0001] This invention relates to the field of multi-compartment fuel tank manufacturing technology, and in particular to an integrated butt welding method for the cylinder wall of an aviation fuel tank. Background Technology

[0002] As a key component of aviation products, fuel tanks present significant challenges in manufacturing, including high precision requirements, numerous parts requiring assembly and welding, and complex production processes. Currently, the production of multi-section fuel tanks primarily relies on manual welding, resulting in low levels of welding automation. Assembly and welding process control is mainly based on extensive process testing and adjustments made based on human experience. This leads to manufacturing difficulties such as low efficiency, poor quality stability, high dependence on manual labor, and insufficient welding capabilities.

[0003] The existing assembly and welding operation mode can no longer meet the requirements of automated production and consistent welding accuracy; the production process is cumbersome, the production cycle is long, and there are problems such as poor consistency of docking and assembly and low welding accuracy.

[0004] Therefore, there is a need to provide an integrated welding method for the cylinder wall of an aviation fuel tank to achieve rapid welding of multiple workpieces, shorten the production cycle, and improve product precision. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide an integrated welding method for the cylinder wall of an aviation fuel tank, in order to solve the problems of complex procedures, long production cycles, and poor consistency of production precision in the existing multi-section fuel tank outer shell welding and assembly process.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] A method for integral butt welding of the cylinder wall of an aviation fuel tank includes the following steps:

[0008] Step S1: Install circular clamps on the outside of the multi-section cylindrical workpiece to clamp and position the cylindrical workpiece.

[0009] Step S2: Hoist the circular clamp and the cylindrical workpiece it positions onto the roller support mechanism of the workpiece docking equipment, and support the multiple sections of the cylindrical workpiece through multiple sets of roller support mechanisms;

[0010] Step S3: The axial series clamping mechanism of the workpiece docking equipment is used to axially clamp and dock multiple sets of circular clamps and cylindrical workpieces, so that the two ends of the multiple cylindrical workpieces are clamped by the tail flange assembly and the rotating flange assembly respectively.

[0011] Step S4: The rotating flange assembly drives multiple cylindrical workpieces to rotate synchronously in the circumferential direction under the drive of the rotating drive mechanism, and then the welding equipment performs rotary welding on multiple circumferential welds of the multiple cylindrical workpieces.

[0012] Furthermore, in step S1, for multi-segment workpieces that need to be welded, the workpiece without positioning features is welded to the adjacent workpiece with positioning features by laser spot welding to form a multi-segment cylindrical workpiece; and a positioning block is set on the circular clamp to match the positioning features of the cylindrical workpiece, so that the circumferential position of the circular clamp and the corresponding cylindrical workpiece is consistent.

[0013] Furthermore, in step S1, according to the circumferential assembly consistency requirements of the multi-segment cylindrical workpiece, clamp positioning holes are opened on the circular clamps; when the clamp positioning holes of the multiple circular clamps are coaxial, the circumferential orientation of the multi-segment cylindrical workpieces meets the alignment accuracy of the workpiece assembly.

[0014] Furthermore, in step S2, multiple sets of roller support mechanisms are slidably installed on the straight crossbeam of the workpiece docking equipment, so that the circular clamp and roller support mechanism can slide and displace along the axial direction of the straight crossbeam, thereby realizing the axial series clamping of multiple cylindrical workpieces.

[0015] Furthermore, in step S2, the workpiece docking equipment is provided with multiple sets of pneumatic positioning pin assemblies arranged coaxially; after adjusting the circumferential position of the circular clamp, the pneumatic positioning pins can be driven to move upward by the positioning cylinder to lock the circumferential position of the multiple sets of circular clamps, thereby limiting the circumferential position of the multiple cylindrical workpieces.

[0016] Furthermore, in step S3, the clamping and docking process of the axial series clamping mechanism for the multi-segment cylindrical workpiece is as follows:

[0017] Step S301: The tail flange assembly and the rotating flange assembly are respectively connected to the last section of the multi-section cylindrical workpiece and the first section of the workpiece, and are both limited by the keyway circumferentially.

[0018] Step S302: The linear drive mechanism of the axial series clamping mechanism drives the tail flange assembly to move linearly towards the rotating flange assembly, and drives the cylindrical workpiece at the end to move towards the adjacent cylindrical workpiece.

[0019] Step S303: The tail flange assembly continues to move linearly towards the rotating flange assembly until the multiple cylindrical workpieces are sequentially axially pressed together as one unit.

[0020] Furthermore, in step S4, before the rotary drive mechanism drives the cylindrical workpiece to rotate, the positioning cylinder drives the pneumatic positioning pin to move down, releasing the circumferential limit on the cylindrical workpiece, so that the multi-segment cylindrical workpiece can rotate circumferentially with the rotary flange assembly.

[0021] Furthermore, the workpiece docking equipment also includes: a weld seam clamping mechanism; the arc-shaped clamping ring of the weld seam clamping mechanism can radially clamp the cylindrical workpiece across the weld seams of multiple cylindrical workpieces; and then the weld seam in the middle of the arc-shaped clamping ring can be welded by welding equipment.

[0022] Furthermore, in step S4, the rotary welding process of the cylindrical workpiece is as follows:

[0023] Step S401: The arc-shaped clamping ring of the weld clamping mechanism clamps the weld of the multi-section cylindrical workpiece, and the weld area enclosed by the arc-shaped clamping ring is welded by the welding equipment;

[0024] Step S402: The clamping cylinder drives the arc-shaped clamping ring to lift, releasing the circumferential rotational freedom of the multi-segment cylindrical workpiece;

[0025] Step S403: Drive the rotating flange assembly to rotate through the rotating drive mechanism, thereby rotating the multi-section cylindrical workpiece and switching between different areas of the weld seam for clamping through the arc-shaped clamping ring;

[0026] Step S404: Repeat the process of steps S401 to S403 above until the complete area of ​​the circumferential weld of the multi-section cylindrical workpiece is welded.

[0027] Furthermore, in step S4, when the welding equipment welds the multi-section cylindrical workpiece, an inert gas is introduced into the cavity of the multi-section cylindrical workpiece as a protective gas.

[0028] The technical solution of this invention can achieve at least one of the following effects:

[0029] 1. The integrated welding method for the cylinder wall of the aviation fuel tank of the present invention realizes process reengineering, simplifying the original multiple welding processes of multiple compartments into one or two processes, merging the laser welding process, improving welding efficiency, and ensuring welding consistency. For situations where no positioning features are available on the workpiece, a creative step-by-step implementation is adopted. First, the workpiece without positioning features is laser-positioned and spot-welded with another adjacent workpiece containing positioning features to form a process assembly, integrating the parts into a whole. This assembly, as a whole, then utilizes the positioning features of the aforementioned workpiece containing positioning features for automated assembly.

[0030] 2. The integrated butt welding method for the cylinder wall of the aviation fuel tank of the present invention uses a linear drive mechanism to drive the tail flange assembly to move, thereby axially pressing the multi-section cylindrical workpieces together. This significantly shortens the multi-section docking cycle. Traditional multi-section docking requires multiple repetitive processes of "single section positioning → docking → disassembly → next section positioning". However, the multi-section docking of the present invention can complete the axial arrangement and synchronous pressing of multiple sections (the fuel tank shell of the present invention has seven sections, which can be expanded according to needs) in one go through the axial series pressing function, without the need for segmented operation. This reduces the overall docking time of multi-sections by more than 60%, and it can also be adapted to multi-section splicing scenarios such as long pipes and reactor cylinder sections, making it widely applicable.

[0031] 3. The integrated welding method for the cylinder wall of the aviation fuel tank of the present invention achieves synchronous assembly and welding of multiple sections of an "integrated fuel tank" by using an axial series clamping mechanism to clamp multiple sections. The first and last sections of the workpiece are positioned by a rotating flange assembly and a tail flange assembly. The spatial relative positions of multiple intermediate sections are positioned by multiple sets of roller support mechanisms and pneumatic positioning pin assemblies. This method ensures the accuracy of the overall product docking and assembly precision by determining the circumferential relative positions of multiple sections. It enables efficient assembly and docking of multiple sections of the fuel tank, automated laser welding integrated operation, and can be linked with welding robots to reduce the labor intensity of operation and improve production efficiency.

[0032] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0033] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0034] Figure 1 This is a flowchart of an integrated butt welding method for the cylindrical wall of an aviation fuel tank according to the present invention;

[0035] Figure 2 This is a schematic diagram of the positioning spot welding fixture of the present invention;

[0036] Figure 3 This is one of the overall structural schematic diagrams of the workpiece docking equipment of the present invention;

[0037] Figure 4 This is the second schematic diagram of the overall structure of the workpiece docking equipment of the present invention;

[0038] Figure 5 This is a schematic diagram of the axial series clamping mechanism of the present invention;

[0039] Figure 6 This is a schematic diagram of the roller clamping mechanism of the present invention;

[0040] Figure 7 This is a schematic diagram of the weld seam clamping mechanism of the present invention;

[0041] Figure 8 This is a schematic diagram of the circular clamp of the present invention;

[0042] Figure 9 This is a schematic diagram of the roller support mechanism of the present invention;

[0043] Figure 10 This is a schematic diagram of the roller support mechanism of the present invention installed on a straight crossbeam;

[0044] Figure 11 This is a schematic diagram of the support state of the roller support mechanism for the clamp according to the present invention;

[0045] Figure 12 This is a schematic diagram of the circumferential orientation adjustment mechanism of the present invention;

[0046] Figure 13 This is a schematic diagram of the axial airbag of the present invention.

[0047] Figure label:

[0048] 1-Equipment frame; 2-Axial tandem clamping mechanism; 3-Rotary transmission servo mechanism; 4-Output hexagonal structure; 5-Roller clamping mechanism; 6-Weld seam clamping mechanism; 7-Circular clamp; 8-Roller support mechanism; 9-Positioning shaft; 10-Positioning crossbeam; 11-Straight crossbeam; 12-Axial airbag; 13-Airbag protruding ring; 14-Connecting groove; 15-Airbag positioning shaft; 18-Rotary motor; 19-Hinged support seat; 20-Cylinder shaft; 21-Support cylinder; 22-C-shaped cylinder mounting plate; 23-Rotary support seat; 24-Elastic support pad; 25-Frame housing; 101-Supporting ring mechanism; 102-Pressure plate mechanism; 103-Supporting ring cylinder; 104-Pressure plate cylinder; 105-Positioning hole; 106-Cross-seam clamp; 107-Workpiece without positioning features; 108-Workpiece with positioning features ; 109-First sector-shaped flat hole; 201-Pressure servo motor; 202-Ball screw; 203-Linear guide rail; 204-Elastic mating flange; 205-Spring; 206-Tail top flange; 301-Pulley drive mechanism; 501-Pressure wheel; 502-Pressure wheel rocker arm; 503-Pressure wheel cylinder; 504-Pressure wheel cylinder base; 601-Arc-shaped pressure ring; 602-Second sector-shaped flat hole; 603-Pressure ring rocker arm; 604-Pressure cylinder; 605-Pressure cylinder base; 701-First half-clamping ring; 702-Second half-clamping ring; 703-Positioning block; 704-Connecting block; 705-Pneumatic positioning pin; 706-Positioning cylinder; 801-Support wheel; 802-Support wheel bracket; 803-Positioning groove; 804-First positioning screw; 805-Second positioning screw. Detailed Implementation

[0049] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which 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 intended to limit the scope of the present invention.

[0050] Example 1

[0051] In a specific embodiment of the present invention, an integrated butt-welding method for the cylinder wall of an aviation fuel tank is provided, such as... Figure 1 As shown, it includes the following steps:

[0052] Step S1: Install circular clamps 7 on the outside of the multi-section cylindrical workpiece to clamp and position the cylindrical workpiece.

[0053] Step S2: Hoist the circular clamp 7 and the cylindrical workpiece it positions onto the roller support mechanism 8 of the workpiece docking equipment, and support the multiple cylindrical workpiece sections through multiple sets of roller support mechanisms 8.

[0054] Step S3: The axial series clamping mechanism 2 of the workpiece docking equipment axially clamps and connects multiple sets of circular clamps and cylindrical workpieces, so that the two ends of the multiple cylindrical workpieces are clamped by the tail flange assembly and the rotating flange assembly respectively.

[0055] Step S4: The rotating flange assembly drives multiple cylindrical workpieces to rotate synchronously in the circumferential direction under the drive of the rotating drive mechanism, and then the welding equipment performs rotary welding on multiple circumferential welds of the multiple cylindrical workpieces.

[0056] In this embodiment, as Figure 3 , Figure 4 As shown, a workpiece docking device of the present invention includes: a device frame 1, an axial series clamping mechanism 2, a rotary transmission servo mechanism 3, a radial clamping mechanism, a circular clamp 7, and a roller support mechanism 8.

[0057] Specifically, such as Figure 4 As shown, the roller support mechanism 8 includes two symmetrically arranged support wheels 801, and multiple sets of the roller support mechanism 8 are slidably arranged on the equipment frame 1; the multiple sets of support wheels 801 can support the cylindrical workpieces of multiple compartments; the rotary transmission servo mechanism 3 includes: a rotary drive mechanism and a rotary flange assembly; the rotary drive mechanism is used to drive the rotary flange assembly to rotate; the rotary flange assembly can dock with the first cylindrical workpiece and can drive the first cylindrical workpiece to rotate; the axial series pressing mechanism 2 includes: a tail top flange assembly and a linear drive mechanism; the tail top flange assembly can dock with the last cylindrical workpiece, and the linear drive mechanism can axially press the cylindrical workpieces of multiple compartments when it drives the tail top flange assembly to linear displacement; the radial pressing mechanism is used to radially press multiple workpieces; under the axial pressing state, the multiple cylindrical workpieces can be driven to rotate synchronously circumferentially by the rotary flange assembly, so that the multiple cylindrical workpieces can be welded into one piece by welding equipment.

[0058] In steps S1 to S4, a circular clamp 7 is provided on the outside of the cylindrical workpiece; when multiple sets of "circular clamp 7 and cylindrical workpiece" are connected in series into a whole under the push of the tail flange assembly of the axial series pressing mechanism 2, the rotary drive mechanism of the rotary transmission servo mechanism 3 drives the rotary flange assembly to rotate, thereby driving the circular clamp 7 to rotate on the support wheel 801; thus, the multi-section workpiece can be welded by a welding robot or other welding equipment.

[0059] Furthermore, in this embodiment, the cylindrical workpiece includes: four sections of metal cylindrical forgings (high rigidity and not easily deformed) and three sections of annular sheet metal parts (easily deformed into an elliptical shape under stress). The sheet metal parts are held in place by the circular clamp 7 to maintain their normal circular shape, ensuring accurate docking between the sheet metal shell and the forging sections.

[0060] The following describes the radial method for integral butt welding of the aviation fuel tank wall of the present invention step by step:

[0061] I) Step S1:

[0062] In step S1, for the multi-segment workpieces that need to be welded, the workpiece 107 without positioning features and the adjacent workpiece 108 with positioning features are welded together by laser spot welding to form a multi-segment cylindrical workpiece; and a positioning block 703 is set on the circular clamp 7 to match the positioning features of the cylindrical workpiece, so that the circumferential position of the circular clamp and the corresponding cylindrical workpiece is consistent.

[0063] In step S1, spot welding is performed on the workpiece 107 without positioning features and the workpiece 108 with positioning features using a positioning spot welding fixture; the workpiece 107 without positioning features and the workpiece 108 with positioning features are connected, and then the whole can be clamped and positioned by the circular clamp 7. It is worth noting that when multiple workpieces are all workpieces with positioning features 108, the multiple workpieces can be directly positioned and connected to the circular clamp 7 without the need for the previous spot welding process.

[0064] like Figure 2 The diagram shows a schematic of a positioning spot welding fixture, which is used to assist in spot welding connections between workpieces 107 (without positioning features) and 108 (with positioning features). The positioning spot welding fixture includes: a fixture frame, a ring support mechanism 101, a pressure plate mechanism 102, a ring support cylinder 103, and a pressure plate cylinder 104. Specifically, the ring support mechanism 101 and the pressure plate mechanism 102 are symmetrically arranged on the upper and lower sides of the fixture frame; the ring support cylinder 103 drives the ring support mechanism 101 to move up and down, and the side of the ring support mechanism 101 is provided with radial positioning holes 105; the pressure plate cylinder 104 drives the pressure plate mechanism 102 to move up and down; when the ring support mechanism 101 and the pressure plate mechanism 102 move up and down, they can clamp the workpiece 107 (without positioning features) and the workpiece 108 (with positioning features) between them.

[0065] Specifically, the workpiece 107 without positioning features and the workpiece 108 with positioning features are clamped and positioned by the cross-gap clamping ring 106; the cross-gap clamping ring 106 is provided with a plurality of first fan-shaped flat holes 109 in the circumferential direction. When the cross-gap clamping ring 106 clamps the workpiece 107 without positioning features and the workpiece 108 with positioning features at the same time, the gap between the workpiece 107 without positioning features and the workpiece 108 with positioning features is centered vertically relative to the first fan-shaped flat holes 109 on the cross-gap clamping ring 106.

[0066] Specifically, the radial positioning hole 105 is provided on the side of the ring support mechanism 101. After the workpiece 107 without positioning features and the workpiece 108 with positioning features are docked with the ring support mechanism 101, the workpiece 108 with positioning features is installed above the ring support mechanism 101 and located inside the ring of the ring support mechanism. The circumferential position of the workpiece 108 with positioning features relative to the ring support mechanism 101 can be determined by installing a pin in the radial positioning hole 105. The workpiece 107 without positioning features is installed above the workpiece 108 with positioning features, and the two are tightly connected by a cross-seam clamping ring 106.

[0067] In step S1, the connection method between the workpiece 107 without positioning features and the workpiece 108 with positioning features is as follows:

[0068] Step S101: The ring support cylinder 103 drives the ring support mechanism 101 to move upward, so that the workpiece 107 without positioning features and the workpiece 108 with positioning features rise upward at the same time; at the same time, the pressure plate cylinder 104 drives the pressure plate mechanism 102 to descend and press down the workpiece 107 without positioning features until the workpiece 107 without positioning features and the workpiece 108 with positioning features are pressed tightly.

[0069] Step S102: Start the motor, and the motor will start to drive the workpiece 107 without positioning features, the workpiece 108 with positioning features, and the cross-seam clamping ring 106 to rotate simultaneously.

[0070] Step S103: Using a handheld laser welding gun, the laser welding gun is used to perform spot welding on multiple weld points between the workpiece 107 without positioning features and the workpiece 108 with positioning features through the second fan-shaped flat hole 109, thereby completing the spot welding connection between the two and enabling them to be hoisted as a whole cylindrical workpiece.

[0071] Furthermore, after the spot welding is completed, the ring support cylinder 103 drives the ring support mechanism 101 to move down, so that the workpiece 107 without positioning features and the workpiece 108 with positioning features fall back to their original positions at the same time.

[0072] Furthermore, in step S1, according to the circumferential assembly consistency requirements of the multi-segment cylindrical workpiece, clamp positioning holes are opened on the circular clamp 7; when the clamp positioning holes of the multiple circular clamps 7 are coaxial, the circumferential orientation of the multi-segment cylindrical workpiece meets the alignment accuracy of the workpiece assembly.

[0073] In step S1, multiple "fuel tank shell sections" are held by circular clamps 7, and the circular clamps 7 and single workpieces are installed in sequence. The positioning feature points of the positioning block 703 on the clamping ring positioning block 703 correspond to the workpiece features and are installed to achieve position fixation and shape retention. The seven workpieces are then hoisted onto the workpiece docking equipment in sequence.

[0074] II) Step S2:

[0075] In step S2, multiple sets of roller support mechanisms 8 are slidably installed on the straight beam 11 of the workpiece docking equipment, so that the circular clamp and roller support mechanism 8 can slide and move along the axial direction of the straight beam 11, thereby realizing the axial series pressing of multiple cylindrical workpieces.

[0076] Furthermore, in step S2, the workpiece docking equipment is provided with multiple sets of pneumatic positioning pin assemblies arranged coaxially; after adjusting the circumferential position of the circular clamp, the pneumatic positioning pin 706 can be driven to move upward by the positioning cylinder 705 to lock the circumferential position of the multiple sets of circular clamps 7, thereby limiting the circumferential position of the multiple cylindrical workpieces.

[0077] In this embodiment, as Figure 9 , Figure 10 As shown, the roller support mechanism 8 includes two symmetrically arranged sets of support wheel assemblies; each support wheel assembly includes a support wheel 801 and a support wheel bracket 802; the support wheel 801 is mounted on the upper end of the support wheel bracket 802, and the support wheel bracket 802 is slidably mounted on the equipment frame 1. In implementation, the circular clamp 7 is driven by the rotary transmission servo mechanism 3 to roll on the driven double sets of symmetrically arranged support wheels 801, which can prevent the circular clamp 7 from deforming and collapsing. Specifically, the support wheel 801 uses a CF bearing.

[0078] Specifically, such as Figure 3 , Figure 4 As shown, a straight crossbeam 11 is fixedly installed in the middle of the equipment frame 1; a straight groove is provided on the side of the straight crossbeam 11; a positioning groove 803 is provided on the side of the support wheel bracket 802, and the positioning groove 803 can fit against the outer side of the straight crossbeam 11; a U-shaped hole is provided at the lower end of the support wheel bracket 802, and a first positioning screw 804 is installed in the U-shaped hole; the end of the first positioning screw 804 is inserted into the straight groove on the side of the straight crossbeam 11.

[0079] Furthermore, such as Figure 9 As shown, a straight groove is also provided on the top surface of the straight beam 11. A second positioning screw 805 is installed on the protrusion on the side of the support wheel bracket 802, and the second positioning screw 805 is inserted into the straight groove on the top surface of the straight beam 11, so as to realize the sliding installation of the support wheel bracket 802 on the top and side surfaces of the straight beam 11, and prevent the support wheel bracket 802 from deflecting when the workpiece is hoisted onto the support wheel 801.

[0080] In one specific embodiment of the present invention, a pneumatic positioning pin assembly is further provided to achieve circumferential positioning of the circular clamp 7 and the cylindrical workpiece; such as Figure 10 , Figure 11As shown, the pneumatic positioning pin assembly includes a positioning cylinder 705 and a pneumatic positioning pin 706. It is worth noting that by setting the positioning cylinder 705 and the pneumatic positioning pin 706 to slide on the linear crossbeam 11, or by setting the axial length of the clamp positioning hole to be greater than the axial length of the pneumatic positioning pin 706, the pneumatic positioning pin assembly can adapt to the axial displacement of the circular clamp 7 when the cylindrical workpiece is axially pressed.

[0081] In one specific embodiment of the present invention, the positioning cylinder 705 and the pneumatic positioning pin 706 are slidably mounted on the straight crossbeam 11, or the positioning cylinder 705 and the pneumatic positioning pin 706 are fixedly mounted on the support wheel bracket 802 of the roller support mechanism 8. In practice, the pneumatic positioning pin 706 can move along the workpiece axial direction following the displacement of the circular clamp 7, thereby facilitating the axial docking of multiple cylindrical workpieces without changing the circumferential orientation.

[0082] In step S2, the hoisting process for multiple workpiece segments is as follows:

[0083] Step S201: Place the circular clamp 7 and the workpiece as a whole into the equipment, hoist the first section of the workpiece to the roller support mechanism 8 with the clamp positioning hole facing downwards and the pneumatic positioning pin 706, and at the same time, the first section of the workpiece docks with the rotating flange assembly to complete the initial positioning of the first section of the workpiece.

[0084] Step S202: Hoist the cylindrical workpiece with multiple intermediate shaft sections and the circular clamp 7 onto the roller support mechanism 8, and make the clamp positioning hole on the circular clamp 7 face the pneumatic positioning pin assembly of the workpiece docking equipment; single workpieces that do not require circumferential positioning can be placed arbitrarily;

[0085] Step S202: The last cylindrical workpiece is hoisted onto the roller support mechanism 8 for support, and simultaneously docked with the tail flange assembly to complete the hoisting and loading of multiple cylindrical workpieces on the workpiece docking equipment.

[0086] Furthermore, in step S2, a circumferential orientation adjustment mechanism is provided below the assembly of the "circular clamp 7 and the cylindrical workpiece" to adjust the circumferential orientation of the circular clamp 7 on the roller support mechanism 8, such as... Figure 12 As shown. Specifically, the circumferential orientation adjustment mechanism is used to adjust the circumferential orientation of the circular clamp 7 and the cylindrical workpiece, so that the circular clamp 7 can be engaged with the pneumatic positioning pin 706, thereby ensuring the docking accuracy of the multi-section compartments, while avoiding the time-consuming and laborious process of manually rotating the circular clamp 7 and the risk of collision and accidental injury to the staff.

[0087] In one specific embodiment of the present invention, such as Figure 12As shown, the circumferential orientation adjustment mechanism includes: an elastic support pad 24, a rotating support base 23, a rotating motor 18, and a support cylinder 21. The elastic support pad 24 is an arc-shaped plate and is fixedly mounted on the upper surface of the rotating support base 23. The rotating support base 23 is driven to rotate by the rotating motor 18, and the support cylinder 21 is used to drive the rotating motor 18 and the rotating support base 23 to move vertically as a whole. When the support cylinder 21 drives the rotating support base 23 to move upward, the two ends of the elastic support pad 24 can press against the surface of the cylindrical workpiece. When the rotating motor 18 drives the rotating support base 23 to deflect left and right, the elastic support pad 24 can drive the cylindrical workpiece and the circular clamp 7 to rotate synchronously in the circumferential direction, thereby aligning the pneumatic positioning pin 706 with the clamp positioning hole on the circular clamp 7.

[0088] Specifically, the upper surface of the rotating support 23 is arc-shaped; the elastic support pad 24 is fixed to the upper surface of the rotating support 23 by adhesive bonding, and the length of the elastic support pad 24 is greater than the length of the upper surface of the rotating support 23, such as... Figure 12 As shown. Further, the elastic support pad 24 is generally arc-shaped with a radius of curvature smaller than the radius of the cylindrical workpiece, so that both ends of the elastic support pad 24 contact the cylindrical workpiece; when the elastic support pad 24 deflects, it can push the cylindrical workpiece to rotate, and simultaneously, under the gravity of the cylindrical workpiece and the circular clamp 7, the elastic support pad deforms itself to adapt to the positional deviation caused by the rotation. Further, the elastic support pad 24 is made of rubber.

[0089] Specifically, a hinged support seat 19 is fixedly mounted on the upper end of the cylinder shaft 20 of the supporting cylinder 21, allowing the hinged support seat 19 to move up and down under the push of the supporting cylinder 21. The rotating support seat 23 is rotatably mounted on the hinged support seat 19, and the rotating motor 18 is fixedly mounted on the side of the hinged support seat 19, with its rotation shaft fixedly connected to the rotating support seat 23. Thus, through the coordinated action of the supporting cylinder 21 and the rotating motor 18, the rotating support seat 23 can achieve both vertical displacement and rotational movement.

[0090] In step S2, the process of adjusting the clamp positioning hole of the circular clamp 7 and the pneumatic positioning pin 706 through the circumferential orientation adjustment mechanism is as follows:

[0091] Step S211: When the cylindrical workpiece and the circular clamp 7 are hoisted onto the roller support mechanism 8 for support, the support cylinder 21 drives the hinged support seat 19 to move upward, so that the elastic support pad 24 is pressed into contact with the lower surface of the cylindrical workpiece.

[0092] Step S212: The rotary motor 18 drives the elastic support pad 24 and the rotary support base 23 to rotate synchronously;

[0093] Step S213: The cylindrical workpiece deflects left and right under the pushing action of the elastic support pad 24, while the circular clamp 7 rolls along the support wheel 801. Adjust the clamp positioning hole on the circular clamp 7 to align with the pneumatic positioning pin 706; the positioning cylinder 705 drives the pneumatic positioning pin 706 to move upward and engage with the clamp positioning hole on the circular clamp 7.

[0094] Furthermore, after the multi-segment cylindrical workpiece is circumferentially positioned, it is axially tightened by the tail flange assembly. After the multi-segment cylindrical workpiece is axially tightened, the clamping mechanism clamps the circular clamp 7 and the cylindrical workpiece. Then, the pneumatic positioning pin 706 separates from the circular clamp 7, and the support cylinder 21 drives the hinged support seat 19 to move down, so that the elastic support pad 24 separates from the cylindrical workpiece, enabling it to carry out the subsequent rotary welding process.

[0095] like Figure 11 As shown, a circular clamp 7 is installed on each workpiece section; as Figure 8 As shown, the circular clamp 7 includes two full-circle clamps. One full-circle clamp is formed by splicing a first half-clamp 701 and a second half-clamp 702. The two half-clamps are equipped with one or more connecting blocks 704 to form a whole circular clamp 7.

[0096] Furthermore, a connecting block 704 is fixedly connected between the two full-circle retaining rings. The connecting block 704, with a clamp positioning hole, serves both as a connection and as a circumferential positioning function for the cylindrical workpiece; alternatively, the clamp positioning hole can also be set on the full-circle retaining ring. The pneumatic positioning pin 706 is a conical or rhomboid pneumatic positioning pin. After the pneumatic positioning pin 706 is aligned with the connecting block 704, it is driven upward by the positioning cylinder 705 directly below the pneumatic positioning pin 706 to insert into the clamp positioning hole on the connecting block 704, thereby achieving circumferential limiting of the cylindrical workpiece. Figure 11 As shown.

[0097] Furthermore, each workpiece segment relies on different positioning blocks 703 to determine the circumferential spatial position of the workpiece relative to the first half-clamping ring 701 and the second half-clamping ring 702. The circular clamp 7 determines the circumferential positioning by inserting a pneumatic positioning pin 706 through a connecting block 704, thus determining the circumferential spatial positioning of the workpiece and ensuring the accuracy of the circumferential orientation of the multi-segment cylindrical workpiece docking (the pneumatic positioning pin 706 moves out when the whole is rotated). Specifically, the shape and position of the positioning block 703 are determined according to the surface structure of the cylindrical workpiece that needs to be held.

[0098] In this embodiment, connecting blocks 704 are fixedly connected to the upper ends and both sides of the two full-circle rings of the circular clamp 7, while no connecting blocks 704 are provided at the lower end to reserve contact space between the elastic support pad 24 and the cylindrical workpiece. Furthermore, since the circular clamp 7 has a certain degree of circumferential positioning accuracy when hoisted onto the roller support mechanism 8, the circumferential distance between the clamp positioning hole and the pneumatic positioning pin 706 is very small, and a slight deflection of the circular clamp 7 is sufficient to align the clamp positioning hole with the pneumatic positioning pin 706. Further, a positioning sensor is embedded in the upper end of the pneumatic positioning pin 706, which is used to detect whether the pneumatic positioning pin 706 and the clamp positioning hole are aligned. After the pneumatic positioning pin 706 of the workpiece docking equipment of the present invention is in position, the circular clamp 7 cannot rotate.

[0099] This invention uses a circular clamp 7 to hold the workpiece, and a pneumatic positioning pin 706 engages with the clamp positioning hole on the clamp ring to ensure the overall coaxiality and end face fit of the multi-compartment workpiece. When the multi-compartment cylindrical workpiece is axially connected and pressed together by the tail flange, multiple sets of support wheel support assemblies 8 slide synchronously relative to the straight crossbeam 11 of the equipment frame to ensure that the axes of all connected cylindrical sections are on the same straight line, avoiding the decrease in overall coaxiality caused by reference deviation during segment docking. At the same time, the end faces of each cylindrical section are tightly fitted by uniform axial pressure, eliminating the problems of "end face misalignment" and "uneven gap" that may occur during segment docking, and further improving the overall assembly accuracy.

[0100] III) Step S3:

[0101] In this embodiment, as Figure 5 As shown, the linear drive mechanism includes: a clamping servo motor 201, a ball screw 202, and a linear guide rail 203; the tail flange assembly is slidably mounted on the linear guide rail 203; specifically, two linear guide rails 203 are symmetrically arranged on both sides of the equipment frame 1; the clamping servo motor 201 is used to drive the ball screw 202 to rotate, the ball screw 202 and the tail flange assembly form a ball screw pair, and when the ball screw 202 rotates, it can drive the tail flange assembly to slide linearly along the linear guide rail 203. Further, as... Figure 5As shown, the tail top flange assembly includes: a flexible mating flange 204, a spring 205, and a tail top flange 206. The flexible mating flange 204 is used to mate with a cylindrical workpiece, and the two are engaged by a keyway. The flexible mating flange 204 is elastically connected to the tail top flange 206 via the spring 205. The tail top flange 206 is slidably mounted on the end of the linear guide rail 203 via a flange support. Specifically, the tail top flange 206 is rotatably mounted on the flange support, and the flange support is slidably mounted on the linear guide rail 203 and forms a ball screw pair with the ball screw 202. This allows the tail top flange assembly to move linearly when the servo motor 201 drives the ball screw 202 to rotate.

[0102] In this embodiment, the rotary drive mechanism includes a rotary drive motor and a belt drive mechanism 301; the rotary drive motor drives the rotary flange assembly to rotate via the belt drive mechanism. Further, the rotary flange assembly and the tail flange assembly have the same structure; and after the multiple cylindrical workpieces are held together by the circular clamp 7, the first and last cylindrical workpieces can respectively dock with the rotary flange assembly and the tail flange assembly, while the middle multiple cylindrical workpieces are supported above the roller support mechanism 8 by the circular clamp 7. Then, the tail flange assembly is driven to move by the clamping servo motor 201 of the axially connected clamping mechanism 2, thereby clamping the multiple cylindrical workpieces into a single unit. In practice, starting the clamping servo motor 201 can clamp a single workpiece or clamp all seven workpieces together. An elastic mating flange 204 is set on the tail flange 206, and the two flanges are connected by a spring 205 and a sliding guide post. The spring 205 adapts to the clamping force between the elastic mating flange 204 and the workpiece, avoiding damage to the workpiece or causing deformation.

[0103] In step S3, the clamping and docking process of the axial series clamping mechanism 2 on the multi-segment cylindrical workpiece is as follows:

[0104] Step S301: The tail flange assembly and the rotating flange assembly are respectively connected to the last section of the multi-section cylindrical workpiece and the first section of the workpiece, and are both limited by the keyway circumferentially.

[0105] Step S302: The linear drive mechanism of the axial series clamping mechanism 2 drives the tail flange assembly to move linearly towards the rotating flange assembly, and drives the cylindrical workpiece at the end to move towards the adjacent cylindrical workpiece.

[0106] Step S303: The tail flange assembly continues to move linearly towards the rotating flange assembly until the multiple cylindrical workpieces are sequentially axially pressed together as one unit.

[0107] IV) Step S4:

[0108] In step S4, before the rotary drive mechanism drives the cylindrical workpiece to rotate, the positioning cylinder 705 drives the pneumatic positioning pin 706 to move down, releasing the circumferential limit on the cylindrical workpiece, so that the multi-segment cylindrical workpiece can rotate circumferentially with the rotary flange assembly.

[0109] Furthermore, the workpiece docking equipment also includes: a weld seam clamping mechanism 6; the arc-shaped clamping ring 601 of the weld seam clamping mechanism 6 can radially clamp the cylindrical workpiece across the weld seams of multiple cylindrical workpieces; and then the weld seam in the middle of the arc-shaped clamping ring 601 can be welded by welding equipment.

[0110] In this embodiment, during step S4, when performing rotary welding on the cylindrical workpiece, a radial clamping mechanism is used to clamp the circular clamp 7 and the cylindrical workpiece to prevent radial movement of the workpiece; the radial clamping mechanism includes: a roller clamping mechanism 5 and a weld clamping mechanism 6; as shown Figure 3 , Figure 4 As shown.

[0111] The roller clamping mechanism 5 is used to clamp the circular clamp 7, and the weld clamping mechanism 6 is used to clamp the weld seams on both sides of two adjacent workpieces. Further, the roller clamping mechanism 5 and the weld clamping mechanism 6 are respectively arranged on the left and right sides of the equipment frame 1. The roller clamping mechanism 5 is installed side-by-side on one side of the equipment frame 1 and can clamp the upper part of the circular clamp 7; the weld clamping mechanism 6 is located on the other side of the equipment frame 1 and can clamp the weld seam of the cylindrical workpiece.

[0112] Furthermore, such as Figure 6 As shown, the roller clamping mechanism 5 includes: a clamping roller 501, a clamping roller rocker arm 502, a clamping roller cylinder 503, and a clamping roller cylinder base 504; the clamping roller 501 is rotatably mounted on the upper end of the clamping roller rocker arm 502, the clamping roller rocker arm 502 is rotatably mounted on the positioning shaft 9 of the equipment frame 1, and the lower end of the clamping roller rocker arm 502 is rotatably connected to the upper end of the clamping roller cylinder 503, the lower end of the clamping roller cylinder 503 is hinged to the equipment frame 1 through the clamping roller cylinder base 504; when the clamping roller cylinder 503 extends or retracts, it can drive the clamping roller rocker arm 502 to rotate while the clamping roller 501 clamps the circular clamp 7.

[0113] like Figure 6As shown, the clamping wheel 501 is rotatably mounted on the upper end of the clamping wheel rocker arm 502. The clamping wheel rocker arm 502 is hinged to the clamping wheel cylinder 503, and the clamping wheel cylinder 503 is hinged to its base. When the clamping wheel cylinder 503 extends, it can drive the clamping wheel rocker arm 502 to deflect towards the circular clamp 7, thereby pressing the clamping wheel 501 against the upper surface of the circular clamp 7 and allowing it to roll along the surface of the clamping ring when the circular clamp 7 rotates. In this embodiment, the number of roller clamping mechanisms 5 on the equipment frame 1 is consistent with the number of grouped clamping rings. The roller clamping mechanisms 5 can prevent the combination of multiple groups of "circular clamps 7 and cylindrical workpieces" from jumping during the overall rotation welding process.

[0114] Furthermore, such as Figure 7 As shown, the weld seam clamping mechanism 6 includes: an arc-shaped clamping ring 601, a clamping ring rocker arm 603, a clamping cylinder 604, and a clamping cylinder base 605; the arc-shaped clamping ring 601 is fixedly disposed on the upper end of the clamping ring rocker arm 603, the lower end of the clamping ring rocker arm 603 is hinged to the clamping cylinder 604, and the middle part of the clamping ring rocker arm 603 is rotatably mounted on the positioning shaft 9 of the equipment frame 1; the clamping cylinder base 605 is fixedly mounted on the equipment frame 1; when the clamping cylinder 604 extends and retracts, it can drive the clamping ring rocker arm 603 to rotate and simultaneously cause the arc-shaped clamping ring 601 to clamp the weld seam position of the cylindrical workpiece; the arc-shaped clamping ring 601 is provided with a second fan-shaped flat hole 602, which is used to reserve space for spot welding of the weld seam.

[0115] Specifically, such as Figure 7 As shown, the arc-shaped clamping ring 601 of the weld clamping mechanism 6 is provided with a certain number of second sector-shaped flat holes 602. The number of rows of second sector-shaped flat holes 602 is consistent with the number of welds, and the axial dimensions of the second sector-shaped flat holes 602 are symmetrically arranged with respect to the weld line. The arc-shaped clamping ring 601 is an arc-shaped plate structure with a central angle of 120°. Spot welding is performed within a 120° angle range through the second sector-shaped flat holes 602. After spot welding within the 120° range is completed, the clamping cylinder 604 drives the clamping ring rocker arm 603 to rotate and lift the arc-shaped clamping ring 601. Then, through the rotation transmission servo mechanism 3, the workpiece is rotated 120° and the arc-shaped clamping ring 601 is clamped again. Then, spot welding is performed within the second 120° range until the entire workpiece is spot welded 360°.

[0116] Furthermore, such as Figure 3 , Figure 4As shown, the two ends of the positioning shaft 9 are fixedly installed on the equipment frame 1, and the positioning shaft 9 includes two parallel positioning shafts, a first positioning shaft and a second positioning shaft; the pressure wheel rocker arm 502 is rotatably installed on the first positioning shaft; the pressure ring rocker arm 603 is rotatably installed on the second positioning shaft. In this embodiment, two parallel positioning beams 10 are fixedly installed on the equipment frame 1; the pressure wheel cylinder base 504 and the pressure cylinder base 605 are respectively fixedly installed on the two positioning beams 10.

[0117] Furthermore, the rotary welding process of the cylindrical workpiece is as follows:

[0118] Step S401: The arc-shaped clamping ring 601 of the weld clamping mechanism 6 clamps the weld of the multi-section cylindrical workpiece, and the weld area circled by the arc-shaped clamping ring 601 is welded by the welding equipment.

[0119] Step S402: The clamping cylinder 604 drives the arc-shaped clamping ring 602 to lift up, releasing the circumferential rotational freedom of the multi-segment cylindrical workpiece;

[0120] Step S403: Drive the rotating flange assembly to rotate through the rotating drive mechanism, thereby rotating the multi-section cylindrical workpiece, and switching between different areas of the weld seam to be clamped by the arc-shaped clamping ring 601;

[0121] Step S404: Repeat the process from steps S401 to S403 until the spot welding area of ​​the annular weld seam of the multi-section cylindrical workpiece is completed.

[0122] Specifically, in step S404, the arc-shaped clamping ring 601 can clamp the weld seam within a 120° range of multiple cylindrical workpieces; when spot welding is started, multiple sets of arc-shaped clamping rings 601 within a 120° range are activated to clamp the workpiece, while keeping the clamping roller 501 clamped to prevent the workpiece from jumping. After the 120° spot welding is completed, the clamping cylinder 604 of the weld seam clamping mechanism 6 drives the arc-shaped clamping ring 601 to lift up, rotate 120° and then spot weld to 240°, the cylinder lifts up again and then spot welds to 360°, thus completing the positioning spot welding work.

[0123] Further, in steps S401 to S404, the pneumatic positioning pin 706 moves out of the clamp positioning hole, the rotary drive motor is turned on and rotates slowly, and the clamping wheel 501 clamps the circular clamp 7 and can rotate relative to it. The rotary drive motor stops rotating, and the clamping cylinder 604 is activated to clamp the weld seam of the workpiece. This can clamp a single section of the workpiece or clamp all seven sections of the workpiece at the same time.

[0124] Furthermore, in step S4, after the spot welding of the multiple cylindrical workpieces is completed, all the multiple arc-shaped clamping rings 601 are opened, the rotary drive mechanism drives the cylindrical workpiece to rotate 306° around the circle and starts laser welding around the circle. After the welding is completed, the clamping wheel cylinder 503 drives the clamping wheel 501 to lift up and hoist the welded oil tank out, thus completing the welding.

[0125] Furthermore, in step S4, when the welding equipment welds the multi-section cylindrical workpiece, an inert gas is introduced into the cavity of the multi-section cylindrical workpiece as a protective gas.

[0126] Furthermore, the equipment frame 1 is also equipped with a protective gas delivery mechanism, which is used to deliver inert gas as a protective gas to the inside of the cylindrical workpiece. Figure 3 , Figure 4 As shown, the protective gas delivery mechanism is a hexagonal structure 4 containing an argon gas replacement quick-connect interface. The hexagonal structure 4 can be adapted to welding positioners, expanding the applicability of the equipment. Specifically, the hexagonal structure 4 is connected to the side of the rotating flange assembly that contacts the cylindrical workpiece via a gas pipeline or gas channel, thereby enabling the introduction of argon gas (inert gas) as a protective gas into the internal cavity of the cylindrical workpiece.

[0127] In step S4, such as Figure 13 As shown, the axial airbag assembly includes an axial airbag 12 and an airbag positioning shaft 15. The axial airbag 12 is sleeved on the outside of the airbag positioning shaft 15. The axial airbag 12 is inflated through an inflation hole on the airbag positioning shaft 15. In implementation, the axial airbag 12 extends into the interior of a multi-segment cylindrical workpiece to fill the internal space of the cylindrical workpiece, reducing the amount of helium required and saving protective gas.

[0128] Specifically, such as Figure 3 , Figure 4 As shown, the outer side of the equipment frame 1 is a U-shaped seat, which facilitates the insertion of the uninflated axial airbag assembly into the middle cavity of the multi-segment cylindrical workpiece after the multi-segment cylindrical workpiece is installed and positioned on the roller support mechanism 8.

[0129] Furthermore, such as Figure 13 As shown, the surface of the axial airbag 12 is provided with a plurality of axially parallel airbag protrusions 13. When the axial airbag 12 is inflated, the airbag protrusions 13 can support the inner surface of the cylindrical workpiece to maintain the docking reliability of the multi-section workpiece and avoid the displacement between the sections during the rotation welding process.

[0130] Furthermore, inert gas is introduced into the annular cavity formed between the annular gaps between adjacent airbag protrusions 13 and the cylindrical workpiece, forming an annular gas protective ring inside the weld. Multiple connecting grooves 14 are formed on the airbag protrusions 13, connecting the spaces on both sides of the airbag protrusions 13 to achieve sequential communication of the protective gas between the multiple annular gaps.

[0131] Furthermore, the airbag positioning shaft 15 has a hollow structure, with a rotating air supply structure connected to the port of the internal cavity. In implementation, the multi-segment cylindrical workpiece rotates under the drive of the rotating flange assembly to switch different circumferential positions for welding, while the axial airbag 12 and the airbag positioning shaft 15 rotate synchronously to maintain continuous support for the multi-segment cylindrical workpiece.

[0132] Preferably, the axial airbag is made of high-temperature resistant rubber.

[0133] In this embodiment, a CNC+-PLC integrated absolute control system bus mode is used for control. Pneumatic and mechatronic integrated control is employed to automate the control of multiple cylinders and motors, resulting in a high degree of automation. The integrated control of multiple cylinders and motors in this embodiment is within the scope of what those skilled in the art can achieve, and the implementation of the control module will not be described in detail here.

[0134] Compared with the prior art, the technical solution provided in this embodiment has at least the following beneficial effects:

[0135] 1. The integrated welding method for the cylinder wall of the aviation fuel tank in this embodiment enables the docking and assembly of multiple sections of the fuel tank with different cylindrical shapes, solving the problems of low assembly accuracy, low welding efficiency, and high labor intensity. Considering the poor structural rigidity of the lightweight fuel tank section parts, and the fact that individual parts naturally exhibit an elliptical shape, a circular clamp is used to round the workpiece. The clamp and the corresponding single section are mounted as a whole for positioning, assembly, and docking. Positioning devices are set on the section and the clamp, and the workpiece reference is transferred to the clamp, integrating the parts into a whole. To ensure the consistency of the tail pressure of each section, a spring is embedded in the tail flange to ensure the consistency of pressure and axial perpendicularity.

[0136] 2. The integrated welding method for the cylinder wall of the aviation fuel tank of the present invention realizes process reengineering, changing the original 13-17 processes into one process, merging the laser welding process, improving welding efficiency, and ensuring welding consistency. For situations where the workpiece lacks available positioning features, the method creatively implements a step-by-step approach. First, the workpiece without positioning features is laser-positioned and spot-welded with another adjacent workpiece containing positioning features to form a process assembly, integrating the components. This assembly, as a whole, then utilizes the positioning features of the aforementioned workpiece with positioning features for automated assembly.

[0137] 3. The integrated butt welding method for the cylinder wall of the aviation fuel tank of the present invention can connect multiple cylindrical workpieces in series and press them together by displacement of the tail flange assembly of the workpiece docking equipment. During the series pressing process, the equipment can automatically complete the axial positioning, spacing calibration and synchronous pressure of the cylinder sections, which not only reduces the intensity of manual operation, but also avoids the fluctuation of docking quality caused by differences in manual operation, and improves the stability and consistency of multi-cylinder assembly.

[0138] 4. The integrated butt welding method for the aviation fuel tank wall in this embodiment utilizes a pneumatically driven axial airbag assembly to uniformly apply radial support force from the inner wall of the cylinder section outwards. The axial airbag 12 is equipped with an airbag protrusion ring 13 to support the inner wall surface of the cylindrical workpiece, achieving a dual collaborative positioning mechanism of "internal support + external pressure" for multi-section workpieces. The axial airbag and the pressure mechanism form a bidirectional constraint on the cylinder section workpiece, ensuring the end face fit of adjacent cylinder sections and guaranteeing the docking accuracy during welding assembly. For continuous docking scenarios of multiple cylinder sections, each cylinder section achieves an independent and unified positioning benchmark through the dual action of "internal support + external pressure," which can accurately locate the center of the cylinder section and ensure that the cylinder section maintains its inherent shape and center benchmark during docking. The coaxiality index of the final product can be improved by more than 30%, which is especially suitable for aerospace, chemical and other fields with stringent requirements for cylinder section docking accuracy.

[0139] The above description is only a preferred 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 conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for integral butt welding of the cylinder wall of an aviation fuel tank, characterized in that, Includes the following steps: Step S1: Install circular clamps on the outside of the multi-section cylindrical workpiece to clamp and position the cylindrical workpiece. Step S2: Hoist the circular clamp and the cylindrical workpiece it positions onto the roller support mechanism of the workpiece docking equipment, and support the multiple sections of the cylindrical workpiece through multiple sets of roller support mechanisms; Step S3: The axial series clamping mechanism of the workpiece docking equipment is used to axially clamp and dock multiple sets of circular clamps and cylindrical workpieces, so that the two ends of the multiple cylindrical workpieces are clamped by the tail flange assembly and the rotating flange assembly respectively. Step S4: The rotating flange assembly drives multiple cylindrical workpieces to rotate synchronously in the circumferential direction under the drive of the rotating drive mechanism, and then the welding equipment performs rotary welding on multiple circumferential welds of the multiple cylindrical workpieces. In step S1, spot welding is performed on workpieces without positioning features and workpieces with positioning features using a positioning spot welding fixture; the positioning spot welding fixture is used to assist in the spot welding connection between workpieces without positioning features and workpieces with positioning features; the positioning spot welding fixture includes: a fixture frame, a ring support mechanism, a pressure plate mechanism, a ring support cylinder, and a pressure plate cylinder. The ring support mechanism and the pressure plate mechanism are symmetrically arranged on the upper and lower sides of the fixture frame; the ring support cylinder is used to drive the ring support mechanism to move up and down, and the side of the ring support mechanism is provided with radial positioning holes; the pressure plate cylinder is used to drive the pressure plate mechanism to move up and down; when the ring support mechanism and the pressure plate mechanism move up and down, they can clamp workpieces without positioning features and workpieces with positioning features between them. Workpieces without positioning features and workpieces with positioning features are clamped and positioned by a cross-gap clamping ring; the cross-gap clamping ring is provided with multiple first fan-shaped flat holes in the circumference. When the cross-gap clamping ring clamps both workpieces without positioning features and workpieces with positioning features at the same time, the gap between the workpieces without positioning features and workpieces with positioning features is centered vertically relative to the first fan-shaped flat holes on the cross-gap clamping ring. The radial positioning hole is set on the side of the ring support mechanism. After the workpiece without positioning feature and the workpiece with positioning feature are docked with the ring support mechanism, the workpiece with positioning feature is installed above the ring support mechanism and located inside the ring of the ring support mechanism. The circumferential position of the workpiece with positioning feature relative to the ring support mechanism can be determined by installing a pin in the radial positioning hole. The workpiece without positioning feature is installed above the workpiece with positioning feature, and the two are connected by a cross-seam clamping ring.

2. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, In step S1, for multi-segment workpieces that need to be welded, the workpiece without positioning features is welded to the adjacent workpiece with positioning features by laser spot welding to form a multi-segment cylindrical workpiece; and a positioning block is set on the circular clamp to match the positioning features of the cylindrical workpiece, so that the circumferential position of the circular clamp and the corresponding cylindrical workpiece is consistent.

3. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 2, characterized in that, In step S1, according to the circumferential assembly consistency requirements of the multi-segment cylindrical workpiece, clamp positioning holes are opened on the circular clamps; when the clamp positioning holes of the multiple circular clamps are coaxial, the circumferential orientation of the multi-segment cylindrical workpieces meets the alignment accuracy of the workpiece assembly.

4. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, In step S2, multiple sets of roller support mechanisms are slidably installed on the straight beam of the workpiece docking equipment, so that the circular clamp and roller support mechanism can slide and move along the axial direction of the straight beam, thereby realizing the axial series clamping of multiple cylindrical workpieces.

5. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, In step S2, the workpiece docking equipment is equipped with multiple sets of pneumatic positioning pin assemblies arranged coaxially; after adjusting the circumferential position of the circular clamp, the pneumatic positioning pins can be driven to move upward by the positioning cylinder to lock the circumferential position of the multiple sets of circular clamps, thereby limiting the circumferential position of the multiple cylindrical workpieces.

6. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, In step S3, the clamping and docking process of the axial series clamping mechanism for the multi-segment cylindrical workpiece is as follows: Step S301: The tail flange assembly and the rotating flange assembly are respectively connected to the last section of the multi-section cylindrical workpiece and the first section of the workpiece, and are both limited by the keyway circumferential direction. Step S302: The linear drive mechanism of the axial series clamping mechanism drives the tail flange assembly to move linearly towards the rotating flange assembly, and drives the cylindrical workpiece at the end to move towards the adjacent cylindrical workpiece. Step S303: The tail flange assembly continues to move linearly towards the rotating flange assembly until the multiple cylindrical workpieces are sequentially axially pressed together as one unit.

7. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, In step S4, before the rotary drive mechanism drives the cylindrical workpiece to rotate, the positioning cylinder drives the pneumatic positioning pin to move down, releasing the circumferential limit on the cylindrical workpiece, so that the multi-segment cylindrical workpiece can rotate circumferentially with the rotary flange assembly.

8. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, The workpiece docking equipment also includes: a weld seam clamping mechanism; the arc-shaped clamping ring of the weld seam clamping mechanism can radially clamp the cylindrical workpiece across the weld seams of multiple cylindrical workpieces; and then the weld seam in the middle of the arc-shaped clamping ring can be welded by welding equipment.

9. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 8, characterized in that, In step 4, the rotary welding process of the cylindrical workpiece is as follows: Step S401: The arc-shaped clamping ring of the weld clamping mechanism clamps the weld of the multi-section cylindrical workpiece, and the weld area enclosed by the arc-shaped clamping ring is welded by the welding equipment; Step S402: The clamping cylinder drives the arc-shaped clamping ring to lift, releasing the circumferential rotational freedom of the multi-segment cylindrical workpiece; Step S403: Drive the rotating flange assembly to rotate through the rotating drive mechanism, thereby rotating the multi-section cylindrical workpiece and switching between different areas of the weld seam for clamping through the arc-shaped clamping ring; Step S404: Repeat the process of steps S401 to S403 above until the complete area of ​​the annular weld seam of the multi-section cylindrical workpiece is welded.

10. The integrated butt welding method for the cylinder wall of an aviation fuel tank according to claim 1, characterized in that, In step S4, when the welding equipment welds the multi-section cylindrical workpiece, an inert gas is introduced into the cavity of the multi-section cylindrical workpiece as a protective gas.

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