Composite flexible welding tool for aircraft duct and use method thereof

Abstract

This invention discloses a composite flexible welding fixture for aircraft ducts and its usage method. The welding platform of the fixture is configured as a hole-system platform, with mounting holes of preset spacing opened on the end face of the platform in both the transverse and longitudinal directions for positioning and installing various types of positioning components. Each positioning component is locked by a quick-positioning locking shaft. The multiple types of positioning components include: end positioning components, duct positioning components, and pipe clamp positioning components. The end positioning components position the joint parts that are butt-welded or lap-welded with the duct through a joint locator. The duct positioning components support the duct through a duct locator with a V-shaped structure at the top to maintain the spatial position of the duct. The pipe clamp positioning components hold the clamps mounted on the duct through a clamp to maintain the spatial posture of the duct.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of conduit positioning and welding technology, and particularly to a composite flexible welding fixture for aircraft conduits and its application method. Background Technology

[0002] Aircraft ducts are generally classified into three types: straight ducts, planar curved ducts, and three-dimensional curved ducts. Due to the variety of duct shapes and diameters, an aircraft typically contains a large number and variety of ducts.

[0003] Traditional aircraft duct welding involves first manufacturing duct prototypes, then placing these prototypes on a welding platform to assemble them using welding fixtures, and finally clamping the individual duct components onto the assembled fixtures for welding. Since a single type of aircraft requires hundreds of different duct specifications, each specification necessitates the manufacture of duct prototypes. As the number of aircraft models accumulates, the number of duct prototypes reaches thousands, requiring significant manpower and resources for on-site storage and management. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems. This invention provides a composite flexible welding fixture for aircraft ducts and its usage method, in order to solve the problem that the storage and management of ducts on site requires a lot of manpower and resources due to the large number of duct specifications and corresponding duct samples in various types of aircraft.

[0005] The technical solution of the present invention: The present invention provides a composite flexible welding fixture for aircraft ducts, including: a welding platform, and various types of positioning assemblies formed by assembling different assembly elements; wherein, the assembly elements include: a connector locator 7, a support sleeve 8, a connecting support, a duct locator 10, a clamp 11, and a quick positioning locking shaft 14;

[0006] The welding platform 1 is the basic component of the flexible welding fixture. Its platform part is set as a hole system platform. The platform end face of the welding platform 1 has mounting holes with a preset spacing in the horizontal and vertical directions, which are used to position and install various types of positioning components through the mounting holes. The quick positioning locking shaft 14 is used to position and lock each positioning component on the mounting holes of the welding platform 1.

[0007] The positioning assemblies are formed by assembling different components into multiple types, including: end positioning assemblies, conduit positioning assemblies, and pipe clamp positioning assemblies;

[0008] The end positioning assembly includes at least: a connecting support for positioning and connecting with the welding platform 1, a support sleeve 8 installed on the sliding groove of the connecting support, and a joint locator 7 that is fitted into the support sleeve 8 through the connecting shaft 16; the end positioning assembly is used to position the joint parts that are butt-welded or lap-welded with the conduit through the joint locator 7.

[0009] The catheter positioning assembly includes at least: a connecting support for positioning and connecting with the welding platform 1, and a catheter positioner 10 installed on the sliding groove of the connecting support; the catheter positioning assembly is used to support the catheter by means of the catheter positioner 10 with a V-shaped structure at the top, so as to maintain the spatial position of the catheter.

[0010] The pipe clamp positioning assembly includes at least: a connecting support for positioning and connecting with the welding platform 1; a pipe clamp 11 installed on the sliding groove of the connecting support; the pipe clamp 11 is configured as an annular pipe clamp with a circular diameter formed by two semi-circular pipe clamps arranged and installed opposite each other; the pipe clamp positioning assembly is used to hold the clamp position assembled on the conduit by the pipe clamp 11 to maintain the spatial posture of the conduit.

[0011] Each positioning assembly includes at least one of a connector 9 and a height support element 13; wherein, the connector 9 is configured as an L-shaped corner seat, positioned and installed on the welding platform 1 by its horizontal base plate, and connected to the assembly element at the corresponding position in each positioning assembly by the sliding groove of its side plate; the height support element 13 is positioned and installed on the welding platform 1, or fixedly installed on the horizontal base plate of the connector 9, for supporting the height of the positioning element in its positioning assembly; the positioning element includes a joint positioner 7, a conduit positioner 10, and a pipe clamp 11.

[0012] Optionally, in the composite flexible welding fixture for aircraft ducts as described above,

[0013] The connector 9 is used to position and connect its positioning component to the welding platform 1. The connector 9 is configured as an L-shaped corner seat structure, including the following various structures: hole system connector 18, longitudinal groove system connector 19, transverse groove system connector 20 and angle connector 21.

[0014] The side plates of the connectors 9 of various structures are all designed with a sliding groove structure for connecting with the height support element 13, the support sleeve 8, the conduit positioner 10, the pipe clamp 11, or the direction conversion plate 12; the connectors 9 of various structures are respectively positioned and connected to the welding platform 1 through their horizontal base plates, and are locked in place by the quick positioning locking shaft 14.

[0015] The hole system connector 18 has two positioning holes on its horizontal base plate, and the distance between the two positioning holes is the same as the distance between two adjacent mounting holes on the welding platform 1.

[0016] The longitudinal groove system connector 19 has a waist-shaped groove on its horizontal base plate along the longitudinal direction, so as to adjust the longitudinal installation position of the longitudinal groove system connector 19 through the waist-shaped groove.

[0017] The horizontal base plate of the transverse groove system connector 20 is provided with a waist-shaped groove along the horizontal direction, so as to adjust the horizontal installation position of the transverse groove system connector 20 through the waist-shaped groove.

[0018] The angle connector 21 has a circular hole and an arc groove on its horizontal base plate, so that the angle connector 21 can be rotated to both sides of the circular hole by a preset angle to adjust the installation angle of the angle connector 21 on the welding platform 1.

[0019] Optionally, in the composite flexible welding fixture for aircraft ducts as described above,

[0020] The height support element 13 is used to support and adjust the height of various assembly components and to cooperate with the installation and positioning of the guide tube. The height support element 13 is configured with a U-shaped structure, wherein the two end faces forming the L-shape are respectively provided with transverse and longitudinally arranged sliding groove structures for installing sliding assembly components. One end face is provided with a waist-shaped groove, and the other end face is configured with a double positioning hole structure. The end face with the waist-shaped groove and the end face with the double positioning hole are both used to connect with the mounting holes of the welding platform 1.

[0021] The height support element 13 includes a hollow square support 30 and a hollow rectangular support 31.

[0022] Optionally, in the composite flexible welding fixture for aircraft ducts as described above,

[0023] In the end positioning assembly, the connector locator 7 includes a replaceable positioning pin 17 and a connecting shaft 16 vertically mounted on one side end face. The support arm sleeve 8 includes a sleeve and a rectangular plate vertically arranged along the outer side of the sleeve wall to form a T-shaped structure. A waist-shaped groove is provided on the rectangular plate, and a scale is provided on the side end face of the rectangular plate. The connector locator 7 is fitted into the sleeve of the support arm sleeve 8 through its connecting shaft 16. The support arm sleeve 8 is installed by the waist-shaped groove of its rectangular plate cooperating with the sliding groove of the connector 9 or the height support element 13.

[0024] The end positioning assembly is used to adjust and fix the position of the connector locator 7 through the support sleeve 8, and to position the connector parts that are docked or lap-welded with the conduit through the connector locator 7.

[0025] Optionally, in the composite flexible welding fixture for aircraft ducts as described above,

[0026] In the catheter positioning assembly, one end of the catheter positioner 10 is provided with a V-shaped block, and the other end is provided with a rectangular plate connected to the bottom of the V-shaped block. The rectangular plate has an oblong hole and a scale on the side end face of the rectangular plate. The catheter positioner 10 is installed by engaging with the groove of the connector 9 or the height support element 13 through the oblong hole of its rectangular plate.

[0027] The catheter positioner 10 includes at least one of a positioner 22 with a single-layer V-shaped block and a positioner 23 with a double-layer V-shaped block; the top of the V-shaped block at one end of both positioners is provided with a V-groove; the catheter positioner 10 is used to support the catheter arranged in three-dimensional space by its V-shaped block to maintain the spatial position of the catheter, and its V-groove is used to meet the positioning requirements of catheters of different diameters.

[0028] The catheter positioning assembly is used to adjust the height position of the V-block of the catheter positioner 10 by means of the rectangular plate, and to support the catheter arranged in three-dimensional space by means of the V-block, so as to maintain the spatial position of the catheter.

[0029] Optionally, in the composite flexible welding fixture for aircraft ducts as described above,

[0030] In the pipe clamp positioning assembly, the pipe clamp 11 includes: an upper semi-circular pipe clamp 24, a lower semi-circular pipe clamp 25, and a positioning pad 26; wherein, the upper semi-circular pipe clamp 24 and the lower semi-circular pipe clamp 25 are configured as semi-circular pipe clamps with the same diameter, the semi-circular openings of the upper semi-circular pipe clamp 24 and the lower semi-circular pipe clamp 25 are arranged opposite each other, and the ends on the same side are hinged by a positioning pin to form a hinge structure, and the other ends of the two semi-circular pipe clamps are locked with clamping nuts, forming an annular pipe clamp with a circular opening after locking; the bottom of the lower semi-circular pipe clamp 25 has a rectangular plate vertically connected as an integral structure, the rectangular plate has an oblong hole, and the side end face of the rectangular plate has a scale.

[0031] The positioning pad 26 includes semi-circular rings of various thicknesses. The outer diameter of the semi-circular ring matches the inner diameter of the semi-circular tube clamps of the upper and lower semi-circular tube clamps, and the inner diameter of the semi-circular ring matches the outer diameter of the conduit.

[0032] The tube clamp positioning assembly is used to hold the clamping device 11 on the catheter at the clamping position to maintain its spatial posture of holding the catheter, and the position of the tube clamp 11 is adjusted by the lower semi-circular tube clamp 25.

[0033] Optionally, the composite flexible welding fixture for aircraft ducts described above further includes: a pipe clamping assembly 15; the pipe clamping assembly 15 includes: an adapter plate 32, a connecting rod 33, a thin nut 34, a support rod 35, a long support arm sleeve 36, a clamping screw 37, a V-shaped clamping block 38, and a quick-positioning locking shaft 14.

[0034] The adapter plate 32 is provided with mounting holes and countersunk holes. The quick positioning locking shaft 14 positions and connects the adapter plate 32 to the welding platform 1 through the mounting holes. The connecting rod 33 is provided with an internal threaded hole. Its bottom end is connected to the countersunk hole of the adapter plate 32 by a countersunk screw. The bottom end of the support rod 35 is threaded into the internal threaded hole of the connecting rod 33, located above the connecting rod 33, and locked by a thin nut 34.

[0035] One end of the long support sleeve 36 is sleeved on the top of the support rod 35, so that the long support sleeve 36 can slide up and down along the support rod 35 to adjust its height position. The other end of the long support sleeve 36 is provided with an internal threaded hole for threaded connection with the clamping screw 37. The bottom end of the clamping screw 37 is connected to a V-shaped pressure block 38. The height position of the V-shaped pressure block 38 is adjusted by the clamping screw 37, thereby pressing the conduit onto the conduit positioner 10 by the V-shaped pressure block 38.

[0036] Optionally, in the composite flexible welding fixture for aircraft ducts as described above, the assembly element further includes: a direction adapter plate 12 used in various types of positioning assemblies;

[0037] The directional adapter plate 12 includes at least one of the following: a directional moving adapter plate 27a, an L-shaped double-sided groove adapter plate 28, a straight double-sided groove adapter plate 29, and a planar moving adapter plate 27b.

[0038] The directional movable adapter plate 27a is an L-shaped corner seat with rectangular plates on both sides. The rectangular plates have waist-shaped holes and scales on their side surfaces. It is connected to the connector 9 or the height support element 13 by the sliding groove of one rectangular plate and to the L-shaped double-sided groove adapter plate 28 or the straight double-sided groove adapter plate 29 by the sliding groove of the other rectangular plate.

[0039] The L-shaped double-sided groove system adapter plate 28 and the straight double-sided groove system adapter plate 29 both have horizontal and vertically intersecting sliding groove structures on both sides. The sliding grooves are used in conjunction with the rectangular plate of the directional moving type adapter plate 27a to convert the movement of the positioning element in one direction into movement in another direction. The positioning element is a joint positioner 7, a conduit positioner 10, or a pipe clamp 11.

[0040] The planar movable adapter plate 27b includes a rectangular plate and a sliding groove connecting plate located in the same plane. The rectangular plate has an oblong hole and a scale on its side end face. The rectangular plate is connected to the sliding groove of the connector 9 or the height support element 13, and is connected to the positioning element through the sliding groove connecting plate, which is used to adjust the position of the positioning element in the plane.

[0041] Optionally, in the composite flexible welding fixture for aircraft ducts as described above,

[0042] The welding platform 1 includes: a base plate 2, a bushing 3, four support legs 4, four lifting rings 5, and four footings 6; the base plate 2 has four support legs 4 installed at the four corners of its bottom, and four lifting rings 5 ​​are installed at the same height on the outer side of each support leg 4, and four footings 6 are installed on the inner side of each support leg 4.

[0043] The base plate 2 serves as a platform for positioning and installing various positioning components. The platform end face of the base plate 2 has mounting holes with a preset spacing in the horizontal and vertical directions, forming multiple rows of mounting holes in the horizontal direction and multiple columns of mounting holes in the vertical direction. Partition lines are engraved on the midlines of adjacent rows and columns of mounting holes. The column numbers of the mounting holes are marked on the horizontal sides of the base plate 2, and the row numbers of the mounting holes are marked on the vertical sides, so that each mounting hole has a coordinate area represented by row number and column number, which is used for quick positioning of the positioning components to be installed.

[0044] Each of the mounting holes is fitted with a bushing 3, which is used to adjust the hole spacing deviation between the mounting holes to within a preset threshold.

[0045] This invention also provides a method for using a composite flexible welding fixture for aircraft ducts, comprising: flexibly assembling the aircraft duct using the composite flexible welding fixture described in any of the above embodiments, including:

[0046] Step 1: Determine the coordinate positions of the two ends of the aircraft duct on the welding platform 1 according to the design drawing of the aircraft duct, and determine the coordinate positions where the aircraft duct needs to be supported and positioned.

[0047] Step 2: Based on the coordinate positions determined in Step 1, various assembly components are used to assemble various types of positioning assemblies, including: end positioning assemblies, multiple conduit positioning assemblies, multiple pipe clamp positioning assemblies, and multiple pipe clamping assemblies.

[0048] Step 3: According to the design drawing, locate the coordinate area of ​​the installation position of each positioning component on the welding platform 1, place them in the corresponding positions, and then use the quick positioning locking shaft 14 to fix each positioning component to the welding platform 1.

[0049] Step 4: For the catheter positioning assembly that has been installed, use the clamping assembly 15 to install it onto the catheter part that needs to be clamped.

[0050] The beneficial effects of this invention are as follows: Traditional welding assembly concepts require a physical guide tube sample in order to assemble the components based on it. Without a physical guide tube sample, it is impossible to find the installation position of the components. This results in flexible welding platforms for aircraft guide tubes being either standalone hole-system platforms or groove-system platforms, i.e., there are no composite hole-system and groove-system platforms. To address the problems existing in traditional aircraft duct splicing platforms and their assembly schemes, this invention provides a composite flexible welding fixture for aircraft ducts and its usage method. The composite flexible welding fixture can be freely combined into various types and structural forms of positioning components according to the structural form and function of the assembly elements, including: end positioning components, duct positioning components, and pipe clamp positioning components. The welding platform 1 is a hole-system platform, and the connector 9 of the splicing elements and the height support element 13 have hole-system and groove-system connection structures, forming a composite hole-system and groove-system platform. For each type of positioning component, after finding the coordinate area of ​​its installation position on the welding platform 1 and placing it in the corresponding position, a quick-positioning locking shaft 14 can be used to fix each positioning component to the welding platform 1. Furthermore, for the installed duct positioning components, a pipe clamping component 15 can be further installed on the duct part that needs to be clamped, typically installed directly above the duct positioner 10 in the duct positioning component, thus completing the flexible assembly of the aircraft duct using the flexible welding fixture. The composite flexible welding fixture and its application method provided in this invention break through the traditional welding assembly concept. By combining a hole system platform with a composite assembly element of hole and groove systems, it ensures that the assembly element can be installed in place according to the theoretical design digital model. Using the composite flexible welding fixture provided in this invention, based on the diversity and structural design of the positioning elements in the assembly element, and employing a combination assembly method based on the three-dimensional digital model, the manufacturing and assembly of the welding fixture can be completed quickly and efficiently. It can meet the welding requirements of conduits with different diameters, orientations, and structures, and can also reduce the number of dedicated welding fixtures, lower fixture costs, and improve the manufacturing efficiency of welding fixtures. Furthermore, this composite flexible welding fixture has high reconfigurability and flexibility, meeting the need to reduce fixture costs. Attached Figure Description

[0051] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0052] Figure 1 This is a schematic diagram of the welding platform in a composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention.

[0053] Figure 2This is a schematic diagram of the end positioning assembly in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 2 Figure a shows one assembly structure of the end positioning component, and Figure b shows another assembly structure of the end positioning component.

[0054] Figure 3 This is a schematic diagram of the duct positioning assembly in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 3 Figure a shows one assembly structure of the catheter positioning assembly, and Figure b shows another assembly structure of the catheter positioning assembly.

[0055] Figure 4 This is a schematic diagram of the pipe clamp positioning assembly in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 4 Figure a shows one assembly structure of the pipe clamp positioning assembly, and Figure b shows another assembly structure of the pipe clamp positioning assembly.

[0056] Figure 5 This is a schematic diagram of the connecting component in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 5 Figures a, b, c, and d in the diagram illustrate connectors 9 with different structures;

[0057] Figure 6 This is a schematic diagram of the height support element in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 6 Figures a and b in the figure illustrate the height support element 13 with different structures;

[0058] Figure 7 for Figure 2 The illustrated embodiment provides a schematic diagram of the joint positioner and the support sleeve in the end positioning assembly. Figure 7 Figure a shows the joint locator, and Figure b shows the outrigger sleeve.

[0059] Figure 8 for Figure 3 The illustrated embodiment provides a schematic diagram of the catheter positioner in the catheter positioning assembly. Figure 8 Figure a shows a locator 22 with a single layer of V-blocks, and Figure b shows a locator 23 with a double layer of V-blocks.

[0060] Figure 9 This is a schematic diagram of the structure of a medium-pressure pipe assembly in a composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention;

[0061] Figure 10 for Figure 4 A schematic diagram of the tube clamp in the catheter positioning assembly provided in the embodiment shown;

[0062] Figure 11 This is a schematic diagram of the directional transition plate in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 11 Figures a, b, and c in the diagram represent adapter plates with different structural forms.

[0063] Figure 12 This is a schematic diagram of an assembly structure for flexibly assembling aircraft ducts using the composite flexible welding tooling for aircraft ducts provided in an embodiment of the present invention.

[0064] Figure 13 This is a schematic diagram of another assembly structure for flexibly assembling aircraft ducts using the composite flexible welding tooling for aircraft ducts provided in the embodiments of the present invention. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0066] As explained in the background section above, aircraft structures have a wide variety of duct types and quantities. Furthermore, the traditional welding method for aircraft ducts requires the formation of duct samples of various specifications. However, due to the large number of duct samples, the storage and management of ducts on-site requires a significant amount of manpower and resources.

[0067] With the development of CAD technology, it is now possible to create solid digital models of all aircraft ducts in CAD systems based on actual conditions. Therefore, there is an urgent need to provide a universal flexible welding fixture that can be assembled on-site based on the three-dimensional digital model. Based on the above problems and needs, this invention provides a composite flexible welding fixture for aircraft ducts and its usage method. Using this composite flexible welding fixture, the assembled components can be quickly and accurately installed in place during the assembly process, and it is applicable to the welding of various types of flexible ducts with different structures, diameters, shapes, and orientations in aircraft.

[0068] Using modular fixtures, welding tooling can be manufactured and assembled quickly and efficiently based on 3D digital models. It offers high reconfigurability and flexibility, meeting the need to reduce tooling costs.

[0069] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0070] Figure 1 This is a schematic diagram of the welding platform in a composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 1 As shown, the composite flexible welding fixture for aircraft ducts provided in this embodiment of the invention includes: a welding platform 1, and multiple sets of positioning assemblies formed by assembling different assembly elements; the assembly elements in this embodiment of the invention include at least: a connector locator 7, a support sleeve 8, a connecting support, a duct locator 10, a pipe clamp 11, a direction adapter plate 12, and a quick positioning locking shaft 14, wherein the connecting support includes at least one of a connector 9 and a height support element 13.

[0071] In this embodiment of the invention, the welding platform 1 is a basic component of the flexible welding fixture, and its platform portion is configured as a hole-system platform. Specifically, the welding platform 1, as a basic component of the flexible welding fixture, has mounting holes with preset spacing on its end face in both the horizontal and vertical directions, forming a matrix arrangement of mounting holes for positioning and installing various types of positioning components.

[0072] In this embodiment of the invention, multiple types of positioning assemblies are formed by assembling different components, including: end positioning assembly, conduit positioning assembly and pipe clamp positioning assembly. Figure 2 This is a schematic diagram of the end positioning assembly in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 2 Figure a shows one assembly structure of the end positioning component, and Figure b shows another assembly structure of the end positioning component. Figure 3 This is a schematic diagram of the duct positioning assembly in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 3 Figure a shows one assembly structure of the catheter positioning assembly, and Figure b shows another assembly structure of the catheter positioning assembly. Figure 4 This is a schematic diagram of the pipe clamp positioning assembly in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 4 Figure a shows one assembly structure of the pipe clamp positioning assembly, and Figure b shows another assembly structure of the pipe clamp positioning assembly. Additionally, the composite flexible welding fixture provided in this embodiment may further include a pipe clamping assembly 15 used in conjunction with the conduit positioning assembly.

[0073] like Figure 2 The end positioning assembly shown, formed by assembly, includes at least: a connecting support for positioning and connecting with the welding platform 1, a support sleeve 8 installed on the sliding groove of the connecting support, and a joint locator 7 that is fitted into the support sleeve 8 through a connecting shaft 16; the end positioning assembly is used to position the joint parts that are butt-welded or lap-welded with the conduit through the joint locator 7.

[0074] like Figure 3The conduit positioning assembly shown includes at least: a connecting support for positioning and connecting with the welding platform 1, and a conduit positioner 10 mounted on the sliding groove of the connecting support; the conduit positioning assembly is used to support the conduit by the conduit positioner 10 with a V-shaped structure at the top, so as to maintain the spatial position of the conduit.

[0075] like Figure 4 The pipe clamp positioning assembly shown, formed by assembly, includes at least: a connecting support for positioning and connecting with the welding platform 1; a pipe clamp 11 installed on the sliding groove of the connecting support; the pipe clamp 11 is configured as an annular pipe clamp with a circular diameter formed by two semi-circular pipe clamps arranged opposite each other and installed; the pipe clamp positioning assembly is used to hold the clamp position assembled on the conduit by the pipe clamp 11 to maintain the spatial posture of the conduit.

[0076] It should be noted that the connecting support in each positioning component in the above embodiments of the present invention includes at least one of the connecting component 9 and the height support element 13; wherein, the connecting component 9 is configured as an L-shaped corner seat, which is positioned and installed on the welding platform 1 by its horizontal base plate, and is connected to the assembly element at the corresponding position in each positioning component by the sliding groove of its side plate; the height support element 13 is positioned and installed on the welding platform 1, or fixedly installed on the horizontal base plate of the connecting component 9, for supporting the height of the positioning element in the positioning component to which it is located; the positioning element includes a joint locator 7, a conduit locator 10, and a pipe clamp 11.

[0077] In specific implementations, the embodiments of the present invention can be freely combined into various types and structural forms of positioning components according to the structural form and function of the assembled components, including the end positioning component, conduit positioning component, and pipe clamp positioning component in the above embodiments. For example, an end positioning component with a structural form can be composed of a connector locator 7, a support sleeve 8, and a connector 9, such as... Figure 2 Figure a in the diagram; for example, a catheter positioning assembly consisting of connector 9 and catheter positioner 10, such as... Figure 3 Figure a in the diagram; for example, a pipe clamping and positioning assembly consisting of a pipe clamp 11, a direction adapter plate 12, and a height support element 13, such as... Figure 4 Figure a in the diagram. For the various types of positioning components mentioned above, after locating the coordinate area of ​​their installation position on the welding platform 1 and placing them in the corresponding positions, each positioning component can be fixedly connected to the welding platform 1 using the quick-positioning locking shaft 14. Furthermore, for the already installed conduit positioning components, a clamping assembly 15 can be further installed onto the conduit portion requiring clamping. This is typically installed directly above the conduit positioner 10 within the conduit positioning component, thus completing the flexible assembly of the aircraft conduit using the flexible welding fixture.

[0078] In this embodiment of the invention, the connector 9 is used to connect the assembly components and the welding platform 1. For example, it has various structures, such as a hole-type connector 18, a longitudinal groove-type connector 19, a transverse groove-type connector 20, and an angle connector 21. All of the above connectors 19 are L-shaped corner seats. One end is a sliding groove structure for use with rectangular plates of different assembly components, and is equipped with bolt holes for screw fixing. The other end connects to the welding platform 1 and is locked using a quick-positioning locking shaft 14. The quick-positioning locking shaft 14 is a locking element that can quickly position and lock the assembly components to the welding platform 1, meeting the requirements for simple and quick installation. The top of the conduit positioner 10 is set with a V-shaped block to support the position of the conduit in space, adapting to the positioning of conduits of different diameters. The pipe clamp 11 can hold the clamp position of the assembled conduit. Two semi-circular pipe clamps form a circular hinge mechanism to maintain the spatial posture of the conduit. The direction adapter plate 12 can convert the movement of the connected assembly components in one direction into movement in another direction, changing the adjustment position of the assembly components. The height support element 13 is used to support the height of the assembled components and to coordinate with the product's installation and positioning. The pipe clamping assembly 15 can clamp the conduit to the positioning element, ensuring that the conduit's position remains unchanged during processing. By using the assembled components in conjunction with the welding platform 1, different welding fixtures can be assembled according to the structural form of conduits of different diameters to meet the welding requirements of different conduit parts.

[0079] In one implementation of this invention, the welding platform 1 is provided in a structural form, such as... Figure 1 As shown, the welding platform 1 includes: a base plate 2, a bushing 3, four support legs 4, four lifting rings 5, and four footings 6; the base plate 2 has four support legs 4 installed at the four corners of its bottom, and four lifting rings 5 ​​are installed at the same height on the outer side of each support leg 4, and four footings 6 are installed on the inner side of each support leg 4.

[0080] In this implementation, the base plate 2 serves as a platform for positioning and installing various positioning components. The platform end face of the base plate 2 has mounting holes with preset spacing in both the horizontal and vertical directions, forming multiple rows of mounting holes in the horizontal direction and multiple columns in the vertical direction. Partition lines are etched along the midlines of adjacent rows and columns of mounting holes. The column numbers of the mounting holes are marked on both sides of the horizontal direction of the base plate 2, and the row numbers are marked on both sides of the vertical direction, so that each mounting hole has a coordinate area represented by row and column numbers for rapid positioning of the positioning components to be installed. Furthermore, a bushing 3 is inserted into each mounting hole to adjust the hole spacing deviation between the mounting holes within a preset threshold value.

[0081] Furthermore, two rows of mounting holes are opened on the horizontal end faces of the base plate 2 along the height direction, with each row of mounting holes corresponding to the position of each row of mounting holes on the platform end face. Two columns of mounting holes are opened on the vertical end faces along the height direction, with each column of mounting holes corresponding to the position of each column of mounting holes on the platform end face. These are used to expand the platform through the mounting holes on the side end faces or to position and install positioning components.

[0082] In one implementation of this invention, various possible implementation structures for the connector 9 are provided, such as... Figure 5 The diagram shown is a structural schematic of the connector in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 5 Figures a, b, c, and d in the diagram illustrate connectors 9 with different structures.

[0083] In this embodiment of the invention, the function of the connector 9 is to position and connect its location to the welding platform 1. For example, it includes four structures, namely: hole-system connector 18 (e.g. Figure 5 Figure a), longitudinal groove connector 19 (as shown in Figure a) Figure 5 (Figure b in the diagram), transverse groove connector 20 (as shown in the diagram) Figure 5 (Figure c in the diagram) and angle connector 21 (as shown in the diagram) Figure 5 (See Figure d in the diagram); the connectors 9 of the above-mentioned structures are all L-shaped corner seats. The side plates of the above-mentioned connectors 9 are all designed with a sliding groove structure for use with rectangular plates of different assembly components, and are equipped with bolt holes for screw fixing; the base plate is fitted with the welding platform 1, and the welding platform 1 and connectors 19 are locked together by a quick-positioning locking shaft 14.

[0084] In specific implementation, the side plate of the connector 9, which is set as an L-shaped corner seat, is provided with horizontal and vertical staggered sliding grooves of equal width 30H7, which are used to cooperate with various assembly components (such as height support component 13, support arm sleeve 8, conduit positioner 10, pipe clamp 11, or direction adapter plate 12), and are fixed by screws through the assembled bolt holes; the L-shaped corner seat is positioned and connected to the welding platform 1 through its base plate, and is locked by a quick positioning locking shaft 14.

[0085] In this implementation, the horizontal base plate of the hole connector 18 has two positioning holes, and the distance between the two positioning holes is the same as the distance between two adjacent mounting holes on the welding platform 1, for example, the distance between the two positioning holes is 50mm; the horizontal base plate of the longitudinal groove connector 19 has a waist-shaped groove along the longitudinal direction, and the horizontal base plate of the transverse groove connector 20 has a waist-shaped groove along the transverse direction. The longitudinal mounting position of the longitudinal groove connector 19 and the transverse mounting position of the transverse groove connector 20 can be adjusted accordingly through the waist-shaped groove; the horizontal base plate of the angle connector 21 has a round hole and an arc-shaped groove. The angle connector 21 can be rotated 45° to both sides around the round hole to adjust the angle of the angle connector 21 on the welding platform 1; the various connectors 9 of the L-shaped corner seat structure are used in conjunction with the mounting holes of the welding platform 1 through the positioning holes, waist-shaped grooves, and arc-shaped grooves on their respective horizontal base plates.

[0086] In one implementation of this invention, various possible structures for the height support element 13 are provided, such as... Figure 6 The diagram shown is a structural schematic of the height support element in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 6 Figures a and b in the diagram illustrate the height support element 13 with different structures.

[0087] In this embodiment of the invention, the height support element 13 is used to support and adjust the height of different assembled components, and to cooperate with the installation and positioning of the conduit; the height support element 13 can be used alone or in combination with the connector 9.

[0088] In this implementation, the height support element 13 includes a hollow square support 30 and a hollow rectangular support 31, such as... Figure 6 Figure a shows the hollow square support 30, and Figure b shows the hollow rectangular support 31. The height support element 13 has a U-shaped structure, in which the two end faces forming the L-shape are respectively provided with transverse and longitudinally intersecting sliding groove structures, which can be used to install sliding assembly elements with rectangular plates (such as support arm sleeve 8, conduit positioner 10, pipe clamp 11, and direction adapter plate 12). One end face has a waist-shaped groove, and the other end face is set with a double positioning hole structure (i.e., two positioning holes are provided). The end face with the waist-shaped groove and the end face with the double positioning holes can be connected to the mounting holes of the welding platform 1.

[0089] It should be noted that in each embodiment of the present invention, the connecting piece 9 or the height support element 13 is mounted on the welding platform 1 via the quick positioning locking shaft 14. The quick positioning locking shaft 14 is a standard locking element. By tightening the screw, the internal intermediate ball is squeezed, and the intermediate ball is pushed to squeeze the three locking balls to achieve the purpose of quick locking. The outer diameter of the quick positioning locking shaft is a precision shaft, which can meet the purpose of quick positioning.

[0090] The following describes in detail the composition and structure of various types of positioning components in this invention through multiple different assembly and combination methods:

[0091] Implementation Method 1

[0092] like Figure 2 The end positioning assembly in Figure a includes: a connector locator 7, a support sleeve 8, and a connector 9; wherein, the connector locator 7 is used to position the connector parts that are butt-welded or lap-welded with the conduit. Figure 7 for Figure 2 The illustrated embodiment provides a schematic diagram of the joint positioner and the support sleeve in the end positioning assembly. Figure 7 Figure a shows the joint locator, and Figure b shows the support arm sleeve.

[0093] In this implementation, the connector locator 7 includes a connecting shaft 16 and a replaceable locating pin 17. The connecting shaft 16 is vertically mounted on one end face of the replaceable locating pin 17. The support arm sleeve 8 includes a sleeve and a rectangular plate vertically arranged along the outer side of the sleeve wall. The rectangular plate has an oblong hole. The connector locator 7 is fitted into the sleeve of the support arm sleeve 8 through its connecting shaft 16, thus achieving connection with the support arm sleeve 8. The support arm sleeve 8 is assembled into the slot of the connector 9 through the oblong hole of its rectangular plate. In this end positioning assembly, the support arm sleeve 8 is used to fix the position of the connector locator 7 and is connected to the connector 9 through the groove of the connector 9 via the rectangular plate of the support arm sleeve 8.

[0094] Reference Figure 2 and Figure 6 As shown in Figure a, the replaceable positioning pin 17 is manufactured to a suitable specification according to the shape of different catheter connectors, and is fixedly connected to the connecting shaft 16 by screws to meet the positioning requirements of different catheter connectors.

[0095] Reference Figure 2 and Figure 6 As shown in b, the outrigger sleeve 8 has a T-shaped structure. One end is a sleeve for fitting onto the connecting shaft 16 of the connector locator, and the other end is a rectangular plate with a width of 30f7 for engaging with the sliding groove of the connecting support. A scale is engraved on one side of the rectangular plate for adjusting the height of the outrigger sleeve 8.

[0096] Implementation Method 2

[0097] like Figure 3 The catheter positioning assembly shown in Figure a includes: catheter positioner 10 and connector 9. Figure 8 for Figure 3 The illustrated embodiment provides a schematic diagram of the catheter positioner in the catheter positioning assembly. Figure 8Figure a shows a locator 22 with a single-layer V-block, and Figure b shows a locator 23 with a double-layer V-block.

[0098] In this implementation method, refer to Figure 3 and Figure 8 One end of the catheter positioner 10 is set as a V-shaped block, and the other end is set as a rectangular plate connected to the bottom of the V-shaped block. It is used to support the catheter arranged in three-dimensional space through its V-shaped block to maintain the spatial position of the catheter. Its V-shaped structure can adapt to the positioning of catheters of different diameters.

[0099] like Figure 8 As shown, the catheter positioner 10 in this implementation includes, for example, a positioner 22 with a single-layer V-block and a positioner 23 with a double-layer V-block. The difference between the two positioners is that the upper end of the V-block at one end of the catheter positioner 10 is set as a single-layer V-structure or a double-layer V-structure. The upper end of the V-block is a V-groove to support the outer diameter of the catheter, which can meet the positioning requirements of catheters of different diameters. The other end of the V-block is a rectangular plate with a width of 30f7. The rectangular plate is used to cooperate with the sliding groove of the connector 9. A waist-shaped groove is opened in the middle of the rectangular plate for bolt tightening. A scale is engraved on one side of the rectangular plate for adjusting the height position of the V-block.

[0100] Implementation method 3

[0101] For the conduit positioning component in the above-mentioned implementation method 2, the composite flexible welding fixture can also be equipped with a compression component 15 for use with it. Figure 9 This is a schematic diagram of the structure of a pressure pipe assembly in a composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention.

[0102] The clamping assembly 15 in this implementation includes: an adapter plate 32, a connecting rod 33, a thin nut 34, a support rod 35, a long support arm sleeve 36, a clamping screw 37, a V-shaped clamping block 38, and a quick-positioning locking shaft 14. The adapter plate 32 has a mounting hole and a countersunk hole. The quick-positioning locking shaft 14 positions the adapter plate 32 onto the welding platform 1 through the mounting hole. The connecting rod 33 has an internal threaded hole. The bottom end of the connecting rod 33 is connected to the countersunk hole of the adapter plate 32 by a countersunk screw. The bottom end of the support rod 35 is threaded onto the top of the connecting rod 33 and locked by the thin nut 34. One end of the long support arm sleeve 36 is fitted onto the top of the support rod 35, allowing the long support arm sleeve 36 to slide up and down along the support rod 35 to adjust its height. The other end of the long support arm sleeve 36 has an internal threaded hole for threaded connection with the clamping screw 37, and the bottom end of the clamping screw 37 is connected to a V-shaped pressure block 38.

[0103] In this implementation, the height of the V-shaped pressure block 38 can be adjusted by tightening screw 37, so that the V-shaped pressure block 38 is pressed into the corresponding position of the conduit.

[0104] It should be noted that during the installation process, the crimping assembly 15 can be installed onto the corresponding mounting hole position of the welding platform 1 using pre-designed mounting coordinates. Furthermore, using this crimping assembly 15, the conduit can be pressed tightly onto the conduit positioner 10, ensuring that the conduit's position remains unchanged during processing.

[0105] Implementation Method 4

[0106] like Figure 4 The pipe clamp positioning assembly in Figure a includes: a pipe clamp 11, a height support element 13, and a direction adapter plate 12; as shown in Figure a. Figure 4 The pipe clamp positioning assembly in Figure b includes: pipe clamp 11 and connector 9. Figure 10 for Figure 4 The illustrated embodiment provides a schematic diagram of the tube clamp in the catheter positioning assembly.

[0107] The clamp 11 in this implementation includes an upper semi-circular clamp 24, a lower semi-circular clamp 25, and a positioning pad 26. The upper and lower semi-circular clamps 24 and 25 are semi-circular clamps with the same diameter. Their semi-circular openings are positioned opposite each other, and their ends on the same side are hinged together by a positioning pin to form a hinge structure. The other ends of the two semi-circular clamps are locked with clamping nuts, forming a ring-shaped clamp with a fixed circular opening. The positioning pad 26 comprises semi-circular ring sheets of various thicknesses. Its outer diameter matches the upper and lower semi-circular clamps, and its inner diameter matches the outer diameter of the conduit. Different thicknesses are achieved to meet the positioning requirements of conduits with different diameters.

[0108] In addition, the bottom of the lower semi-circular pipe clamp 25 has a rectangular plate that is vertically connected as an integral structure, for example, a rectangular plate with a width of 30f7. The rectangular plate has a waist-shaped hole for connecting with the groove of the connector 9 or the height support element 13; and a scale is engraved on one end face of the rectangular plate for adjusting the position of the pipe clamp 11.

[0109] In the pipe clamp positioning assembly provided in this implementation, the clamp 11 can hold the clamp position of the assembled conduit to maintain its spatial posture of holding the conduit, and the position of the clamp 11 can be adjusted by the lower semi-circular clamp 25.

[0110] Implementation method 5

[0111] Based on the above-mentioned implementation methods, the assembly component may further include: a direction adapter plate 12; this direction adapter plate 12 can be applied to the structure of the above-mentioned positioning components. For example... Figure 11The diagram shown is a structural schematic of the directional transition plate in the composite flexible welding fixture for aircraft ducts provided in an embodiment of the present invention. Figure 11 Figures a, b, and c in the diagram represent adapter plates with different structural forms.

[0112] The directional adapter plate in this implementation may include at least one of the following structures: a directional movement adapter plate 27a, an L-shaped double-sided slot adapter plate 28, a straight double-sided slot adapter plate 29, and a planar adapter plate 27b (e.g., Figure 3 (Figure b in the middle)

[0113] like Figure 11 The directional movable adapter plate 27a shown in Figure a is set as an L-shaped corner seat. Both sides are rectangular plates with a width of 30f7. Each rectangular plate has an oblong hole and a scale. It is connected to the connector 9 or the height support element 13 by the sliding groove of one side rectangular plate, and is used by the sliding groove on one end face of the L-shaped double-sided groove adapter plate 28 or the straight double-sided groove adapter plate 29 by the sliding groove of the other side rectangular plate.

[0114] like Figure 11 The L-shaped double-sided groove adapter plate 28 shown in Figure b and the straight double-sided groove adapter plate 29 shown in Figure c both have transverse and longitudinally arranged sliding groove structures on both end faces. The sliding grooves are used in conjunction with the rectangular plate on the other side of the directional moving adapter plate 27a to convert the movement of the positioning element (e.g., the connector positioner 7, the conduit positioner 10, or the pipe clamp 11) in one direction into movement in another direction.

[0115] like Figure 3 In the catheter positioning assembly shown in Figure b, a planar movable adapter plate 27b is used. The planar movable adapter plate 27b includes a rectangular plate and a sliding groove connecting plate located in the same plane. The rectangular plate has an oblong hole and a scale on its side end face. The rectangular plate is connected to the connector 9 or the height support element 13 through a sliding groove, and is connected to the positioning element through the sliding groove connecting plate to adjust the position of the positioning element in the plane.

[0116] In this implementation method 5, based on the structure of the positioning components in the above implementation methods 1 to 4, by adding a direction transition plate 12 to the positioning components of various types and structures, the movement of the positioning element in one direction can be converted into movement in another direction, or the position of the positioning element in the plane can be adjusted; that is, the purpose of changing the spatial position of the assembly components is achieved.

[0117] Implementation method 6

[0118] Based on the above implementation methods, a specific structure for the welding platform 1 is provided, such as... Figure 1As shown, the welding platform 1 includes a base plate 2, bushings 3, four support legs 4, four lifting rings 5, and four foot anchors 6. The base plate 2 is constructed by butt-welding multiple steel plates (e.g., five plates). After welding, the weld seams are ground, and the platform surface undergoes nitriding treatment to prevent weld slag from damaging the working surface. The base plate 2 has mounting holes spaced 50mm apart in both the horizontal and vertical directions. Dividing lines are marked between adjacent mounting holes. The sides of the horizontal mounting holes on the base plate 2 are marked with numbers 1 to 39, and the sides of the mounting holes are marked with letters A to S. Each mounting hole corresponds to a coordinate area consisting of a letter and number, facilitating rapid installation of components. Additionally, the base plate 2 has six reference holes for establishing a detection coordinate system after the components are installed. The bushings 3 are installed within the mounting holes of the base plate 2, maintaining a hole spacing deviation of less than 0.02mm between adjacent mounting holes. The bushings 3 are used to ensure the hole spacing deviation is correct. The four support legs 4 are of the same specification and are screwed to the base plate 2. They are welded from square tubing and steel plates and are equipped with wheels at the bottom to meet the platform's movement requirements. Lifting rings 5 ​​are installed on the four support legs for lifting welding fixtures. Four foot anchors 6 are installed on the inside of the support legs 4 to ensure the platform's stability.

[0119] Traditional welding assembly requires a physical guide tube sample to assemble components; without it, the installation location of the components cannot be found. This results in flexible welding platforms for aircraft guide tubes being either individual hole-system platforms or groove-system platforms, lacking composite hole-and-groove platforms. To address the problems in traditional aircraft guide tube assembly platforms and their assembly schemes, this invention provides a composite flexible welding fixture for aircraft guide tubes and its usage method. The composite flexible welding fixture can be freely combined into various types and structural forms of positioning components based on the structural form and function of the assembly components, including: end positioning components, guide tube positioning components, and pipe clamp positioning components. The welding platform 1 is a hole-system platform, and the connector 9 and height support element 13 of the assembly components have hole-system and groove-system connection structures, forming a composite hole-and-groove platform. For each type of positioning component, after finding the coordinate area of ​​its installation position on the welding platform 1 and placing it in the corresponding position, a quick-positioning locking shaft 14 can be used to fix each positioning component to the welding platform 1. Furthermore, for the already installed conduit positioning assembly, a clamping assembly 15 can be further installed onto the conduit location requiring clamping. This is typically installed directly above the conduit positioner 10 within the conduit positioning assembly, thus completing the flexible assembly of the aircraft conduit using the flexible welding fixture. The composite flexible welding fixture and its usage method provided in this embodiment of the invention break through the traditional welding assembly concept. By combining a hole system platform with a composite assembly element of hole and groove systems, it ensures that the assembly element can be installed in place according to the theoretical design digital model. Using the composite flexible welding fixture provided in this embodiment of the invention, based on the diversity and structural design of the positioning elements in the assembly element, the assembly element is combined and assembled. Based on the three-dimensional digital model, the manufacturing and assembly of the welding fixture can be completed quickly and efficiently. This can meet the welding requirements of conduits with different diameters, orientations, and structures, and can also reduce the number of dedicated welding fixtures, lower fixture costs, and improve the manufacturing efficiency of the welding fixture. Furthermore, this composite flexible welding fixture has high reconfigurability and flexibility, meeting the need to reduce fixture costs.

[0120] Based on the above embodiments of the present invention, the present invention also provides a method for using the composite flexible welding fixture for aircraft ducts. The composite flexible welding fixture for aircraft ducts provided in any of the above embodiments can be used to position and install aircraft ducts, including the following steps:

[0121] Step 1: Determine the coordinate positions of the two ends of the aircraft duct on the welding platform 1 based on the aircraft duct model, and determine the coordinate positions where the aircraft duct needs to be supported and positioned.

[0122] Step 2: Based on the coordinate positions determined in Step 1, various assembly components are used to assemble various types of positioning assemblies, including: end positioning assemblies, multiple conduit positioning assemblies, multiple pipe clamp positioning assemblies, and multiple pipe clamping assemblies.

[0123] Step 3: Based on the aircraft duct model, locate the coordinate areas of the installation positions of each positioning component on the welding platform 1, place them in the corresponding positions, and then use the quick positioning locking shaft 14 to fix each positioning component to the welding platform 1.

[0124] Step 4: For the catheter positioning assembly that has been installed, use the clamping assembly 15 to install it onto the catheter part that needs to be clamped.

[0125] like Figure 12 The diagram shown is a schematic representation of an assembly structure for flexibly assembling aircraft ducts using a composite flexible welding fixture provided in an embodiment of the present invention; as shown... Figure 13 The diagram shows another assembly structure for flexibly assembling aircraft ducts using the composite flexible welding fixture for aircraft ducts provided in the embodiments of the present invention. It can be seen that the composite flexible welding fixture for aircraft ducts provided in the above embodiments of the present invention can be assembled into different welding fixtures according to the structural form of ducts of different diameters, meeting the welding requirements of different duct parts; that is, this composite flexible welding fixture is applicable to welding fixtures for flexible ducts of different diameters and shapes in aircraft. It uses assembly components for combination and assembly, and the manufacturing and assembly of the welding fixture can be completed quickly and efficiently based on a three-dimensional digital model. In addition, this composite flexible welding fixture has high reconfigurability and flexibility, meeting the need to reduce tooling costs.

[0126] The following provides a method for applying a composite flexible welding fixture for aircraft ducts during the installation process, including:

[0127] 1) First, based on the aircraft duct model, the assembly components used to form different positioning components are called. Through the arrangement and combination of assembly components with different functions, the assembly and installation of various positioning components and pressure pipe components 15 are completed.

[0128] 2) Secondly, based on the aircraft duct model, various positioning components and clamping components 15 are quickly installed. The assembly sequence is to start from one end of the duct and complete the fixed installation of each set of positioning components and clamping components 15 required on the welding platform 1 in sequence according to the direction of the duct.

[0129] 3) Finally, using a coordinate measuring machine (or articulated arm), select three reference holes on welding platform 1, establish a detection coordinate system, detect the surface or hole position of the positioning element, and verify whether the combined fixture meets the manufacturing requirements of the welding fixture.

[0130] The assembly and installation methods in steps 1 and 2 above follow the principles described above:

[0131] (a) The assembly of each positioning component and clamping component 15 is carried out from bottom to top. First, the assembly components connected to the welding platform 1 are installed, including connectors 9 and height support components 13. One of the two components can be selected according to the height of the conduit and connected by a quick-positioning locking shaft. Second, if the component includes a directional adapter plate or a support sleeve, the directional adapter plate and support sleeve must be installed first. The directional adapter plate and support sleeve are installed with the connectors and height support components by the cooperation of the sliding groove and the rectangular plate, and then the connection is locked with screws. Finally, the positioning components are installed, including the connector locator, the conduit locator, and the pipe clamp. The connector locator is used in conjunction with the support sleeve, and the connection is completed by the shaft hole and the pin positioning. The conduit locator and the pipe clamp are connected to the connectors, height support components, or directional adapter plates as needed by the cooperation of the rectangular plate and the sliding groove.

[0132] (b) Since connector 9 has four different structures, the connection between connector 9 and welding platform 1 can be done in two ways. For hole-type connectors, the positioning holes of the connector can be directly used to match the mounting holes of the welding platform to complete the quick installation of the connector. For longitudinal groove-type connectors, transverse groove-type connectors, and angle connectors, the connectors need to be placed in the corresponding positions according to the installation coordinates first, and then installed by relying on the side of the connector to match the mounting holes of the nearby welding platform. First, insert a positioning pin into the nearby mounting hole, measure the distance between the side of the connector and the nearby mounting hole using the model, determine the position of the connector using standard gauge blocks, and then lock it using the quick positioning locking shaft.

[0133] (c) The connection method of using a rectangular plate and a sliding groove requires measuring the distance between the end face of the rectangular plate and the end face of the sliding groove using a model, determining the relative position of the two components using standard gauge blocks, and then tightening with screws to complete the installation.

[0134] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A composite flexible welding fixture for aircraft ducts, characterized in that, include: Welding platform, and various types of positioning assemblies formed by assembling different components; wherein the assembly components include: joint locator (7), support sleeve (8), connecting support, conduit locator (10), pipe clamp (11) and quick positioning locking shaft (14). The welding platform (1) is a basic component of the flexible welding fixture. Its platform part is set as a hole system platform. The platform end face of the welding platform (1) is provided with mounting holes with a preset spacing in the horizontal and vertical directions, which are used to position and install various types of positioning components through the mounting holes. The quick positioning locking shaft (14) is used to position and lock each positioning component on the mounting holes of the welding platform (1). The positioning assemblies are formed by assembling different components into multiple types, including: end positioning assemblies, conduit positioning assemblies, and pipe clamp positioning assemblies; The end positioning assembly includes at least: a connecting support for positioning and connecting with the welding platform (1), a support sleeve (8) installed on the sliding groove of the connecting support, and a joint locator (7) that is fitted into the support sleeve (8) through the connecting shaft (16); the end positioning assembly is used to position the joint parts that are butted or lap-welded with the conduit through the joint locator (7). The catheter positioning assembly includes at least: a connecting support for positioning connection with the welding platform (1), and a catheter positioner (10) mounted on the sliding groove of the connecting support; the catheter positioning assembly is used to support the catheter by means of the catheter positioner (10) with a V-shaped structure at the top, so as to maintain the spatial position of the catheter; The pipe clamp positioning assembly includes at least: a connecting support for positioning and connecting with the welding platform (1), and a pipe clamp (11) installed on the sliding groove of the connecting support. The pipe clamp (11) is configured as an annular pipe clamp with a circular diameter formed by two semi-circular pipe clamps arranged and installed opposite each other. The pipe clamp positioning assembly is used to hold the clamp position assembled on the conduit by the pipe clamp (11) to maintain the spatial posture of the conduit. Each positioning component includes at least one of a connector (9) and a height support element (13); wherein the connector (9) is configured as an L-shaped corner seat, which is positioned and installed on the welding platform (1) by its horizontal base plate, and is connected to the assembly element at the corresponding position in each positioning component by the sliding groove of its side plate; the height support element (13) is positioned and installed on the welding platform (1), or fixedly installed on the horizontal base plate of the connector (9), for supporting the height of the positioning element in the positioning component; the positioning element includes a joint locator (7), a conduit locator (10), and a pipe clamp (11). The connector (9) is used to position and connect its positioning component to the welding platform (1). The connector (9) is set as an L-shaped corner seat structure, including the following various structures: hole system connector (18), longitudinal groove system connector (19), transverse groove system connector (20) and angle connector (21).

2. The composite flexible welding fixture for aircraft ducts according to claim 1, characterized in that, The side plates of the connectors (9) of various structures are all set as sliding groove structures for connecting with the height support element (13), the support sleeve (8), the conduit locator (10), the pipe clamp (11), or the direction conversion plate (12); the connectors (9) of various structures are respectively positioned and connected to the welding platform (1) through their horizontal base plates, and are locked by the quick positioning locking shaft (14); Among them, the horizontal base plate of the hole system connector (18) has two positioning holes, and the distance between the two positioning holes is the same as the distance between two adjacent mounting holes on the welding platform (1); The longitudinal groove system connector (19) has a waist-shaped groove on its horizontal base plate along the longitudinal direction, so as to adjust the longitudinal installation position of the longitudinal groove system connector (19) through the waist-shaped groove; The horizontal base plate of the transverse groove system connector (20) is provided with a waist-shaped groove along the horizontal direction, so as to adjust the horizontal installation position of the transverse groove system connector (20) through the waist-shaped groove; The angle connector (21) has a circular hole and an arc groove on its horizontal base plate, so that the angle connector (21) can rotate around the circular hole to both sides by a preset angle to adjust the installation angle of the angle connector (21) on the welding platform (1).

3. The composite flexible welding fixture for aircraft ducts according to claim 1, characterized in that, The height support element (13) is used to support and adjust the height of various assembly elements and to cooperate with the installation and positioning of the conduit; the height support element (13) is set as a U-shaped structure, wherein the two end faces forming the L-shape are respectively provided with transverse and longitudinally arranged sliding groove structures for installing sliding assembly elements, one end face is provided with a waist-shaped groove, and the other end face is set as a double positioning hole structure. The end face with the waist-shaped groove and the end face with the double positioning hole are both used to connect with the mounting holes of the welding platform (1); The height support element (13) includes a hollow square support (30) and a hollow rectangular support (31).

4. The composite flexible welding fixture for aircraft ducts according to claim 1, characterized in that, In the end positioning assembly, the connector locator (7) includes a replaceable positioning pin (17) and a connecting shaft (16) vertically mounted on one side end face. The support arm sleeve (8) includes a sleeve and a rectangular plate vertically arranged along the axial direction on the outer side of the sleeve wall to form a T-shaped structure. A waist-shaped groove is opened on the rectangular plate, and a scale is provided on the side end face of the rectangular plate. The connector locator (7) is fitted into the sleeve of the support arm sleeve (8) through its connecting shaft (16). The support arm sleeve (8) is installed by the waist-shaped groove of its rectangular plate cooperating with the sliding groove of the connector (9) or the height support element (13). The end positioning assembly is used to adjust and fix the position of the connector locator (7) by means of the support sleeve (8), and to position the connector parts that are docked or lap-welded with the conduit by means of the connector locator (7).

5. The composite flexible welding fixture for aircraft ducts according to claim 1, characterized in that, In the catheter positioning assembly, one end of the catheter positioner (10) is provided with a V-shaped block, and the other end is provided with a rectangular plate connected to the bottom of the V-shaped block. The rectangular plate has a waist-shaped hole and a scale on the side end face of the rectangular plate. The catheter positioner (10) is installed by cooperating with the groove of the connector (9) or the height support element (13) through the waist-shaped hole of its rectangular plate. The catheter positioner (10) includes at least one of a positioner (22) with a single-layer V-block and a positioner (23) with a double-layer V-block; the top of the V-block at one end of both positioners is provided with a V-groove; the catheter positioner (10) is used to support the catheter arranged in three-dimensional space by its V-block to maintain the spatial position of the catheter, and its V-groove is used to meet the positioning requirements of catheters of different diameters; The catheter positioning assembly is used to adjust the height position of the V-block of the catheter positioner (10) through the rectangular plate, and to support the catheter arranged in three-dimensional space through the V-block in order to maintain the spatial position of the catheter.

6. The composite flexible welding fixture for aircraft ducts according to claim 1, characterized in that, The pipe clamp positioning assembly includes a pipe clamp (11) comprising an upper semi-circular pipe clamp (24), a lower semi-circular pipe clamp (25), and a positioning pad (26). The upper semi-circular pipe clamp (24) and the lower semi-circular pipe clamp (25) are configured as semi-circular pipe clamps with the same diameter. The semi-circular openings of the upper semi-circular pipe clamp (24) and the lower semi-circular pipe clamp (25) are arranged opposite each other, and the ends on the same side are hinged by positioning pins to form a hinge structure. The other ends of the two semi-circular pipe clamps are locked with clamping nuts, and after locking, an annular pipe clamp with a circular opening is formed. The bottom of the lower semi-circular pipe clamp (25) has a rectangular plate that is vertically connected as an integral structure. The rectangular plate has a waist-shaped hole, and the side end face of the rectangular plate has a scale. The positioning pad (26) includes semi-circular rings of various thicknesses. The outer diameter of the semi-circular ring matches the inner diameter of the semi-circular tube clamps of the upper and lower semi-circular tube clamps, and the inner diameter of the semi-circular ring matches the outer diameter of the conduit. The tube clamp positioning assembly is used to hold the clamping position of the tube sleeve by the tube clamp (11) to maintain the spatial posture of holding the tube, and the position of the tube clamp (11) is adjusted by the lower semi-circular tube clamp (25).

7. The composite flexible welding fixture for aircraft ducts according to any one of claims 1 to 6, characterized in that, Also includes: The crimping assembly (15) includes: an adapter plate (32), a connecting rod (33), a thin nut (34), a support rod (35), a long support sleeve (36), a clamping screw (37), a V-shaped clamping block (38), and a quick-positioning locking shaft (14). The adapter plate (32) is provided with mounting holes and countersunk holes. The quick positioning locking shaft (14) positions the adapter plate (32) and connects it to the welding platform (1) through the mounting holes. The connecting rod (33) is provided with an internal thread hole. Its bottom end is connected to the countersunk hole of the adapter plate (32) by a countersunk screw. The bottom end of the support rod (35) is threaded into the internal thread hole of the connecting rod (33), located above the connecting rod (33), and locked by a thin nut (34). One end of the long support sleeve (36) is sleeved on the top of the support rod (35), so that the long support sleeve (36) can slide up and down along the support rod (35) to adjust its height position. The other end of the long support sleeve (36) is provided with an internal threaded hole for threaded connection with the clamping screw (37). The bottom end of the clamping screw (37) is connected to a V-shaped pressure block (38). The height position of the V-shaped pressure block (38) is adjusted by the clamping screw (37), thereby pressing the conduit onto the conduit locator (10) by the V-shaped pressure block (38).

8. The composite flexible welding fixture for aircraft ducts according to any one of claims 1 to 6, characterized in that, The assembly components also include: a direction adapter plate (12) used in various types of positioning assemblies. The directional adapter plate (12) includes at least one of the following: directional moving adapter plate (27a), L-shaped double-sided groove adapter plate (28), straight double-sided groove adapter plate (29), and planar moving adapter plate (27b). The directional movable adapter plate (27a) is an L-shaped corner seat with rectangular plates on both sides. The rectangular plates have waist-shaped holes and scales on their side surfaces. The rectangular plates are connected to the connector (9) or the height support element (13) through a groove, and the rectangular plates are used to connect to the L-shaped double-sided groove adapter plate (28) or the straight double-sided groove adapter plate (29) through a groove. The L-shaped double-sided groove adapter plate (28) and the straight double-sided groove adapter plate (29) both have horizontal and vertical crisscrossing sliding groove structures on both sides. The sliding grooves are used in conjunction with the rectangular plate of the directional moving adapter plate (27a) to convert the movement of the positioning element in one direction into movement in another direction. The positioning element is a connector locator (7), a conduit locator (10), or a pipe clamp (11). The planar movable adapter plate (27b) includes a rectangular plate and a sliding groove connecting plate located in the same plane. The rectangular plate has an oblong hole and a scale on its side end face. The rectangular plate is connected to the connector (9) or the height support element (13) through the sliding groove, and is connected to the positioning element through the sliding groove connecting plate to adjust the position of the positioning element in the plane.

9. The composite flexible welding fixture for aircraft ducts according to any one of claims 1 to 6, characterized in that, The welding platform (1) includes: a base plate (2), a bushing (3), four legs (4), four lifting rings (5), and four feet (6); the base plate (2) has four legs (4) installed at the four corners of its bottom, and four lifting rings (5) are installed at the same height on the outer side of each leg (4), and four feet (6) are installed on the inner side of each leg (4). The base plate (2) serves as a platform for positioning and installing various positioning components. The platform end face of the base plate (2) is provided with mounting holes of a preset spacing in the horizontal and vertical directions, forming multiple rows of mounting holes in the horizontal direction and multiple columns of mounting holes in the vertical direction. Partition lines are engraved on the midline of adjacent rows and adjacent columns of the mounting holes. The column number of the mounting hole is marked on the horizontal side of the base plate (2), and the row number of the mounting hole is marked on the vertical side, so that each mounting hole has a coordinate area represented by the row number and column number, which is used for quick positioning of the positioning components to be installed. Each of the mounting holes is fitted with a bushing (3) for adjusting the hole spacing deviation between the mounting holes within a preset threshold.

10. A method of using a composite flexible welding fixture for aircraft ducts, characterized in that, The flexible assembly of aircraft ducts using the composite flexible welding fixture for aircraft ducts as described in any one of claims 1 to 9 includes: Step 1: Determine the coordinate positions of the two ends of the aircraft duct on the welding platform (1) based on the aircraft duct model, and determine the coordinate positions of the aircraft duct that need to be supported and positioned. Step 2: Based on the coordinate positions determined in Step 1, various assembly components are used to assemble various types of positioning assemblies, including: end positioning assemblies, multiple conduit positioning assemblies, multiple pipe clamp positioning assemblies, and multiple pipe clamping assemblies. Step 3: According to the design drawing, find the coordinate area of ​​the installation position of each positioning component on the welding platform (1), and place them in the corresponding positions. Then, use the quick positioning locking shaft (14) to fix each positioning component to the welding platform (1). Step 4: For the catheter positioning assembly that has been installed, use the clamping assembly (15) to install it onto the catheter part that needs to be clamped.

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