A fixture for welding a fuel chamber oil supply ring assembly and method of use

Abstract

The application relates to a kind of fixture for welding combustion chamber oil supply ring pipe assembly and its using method, belong to the technical field of welding fixing tooling.The upper surface of bottom plate is sequentially provided with support sleeve, mounting block, guide block and positioning block;the upper end of support sleeve is used in cooperation with multiple pressing plate assemblies, each pressing plate assembly is installed on the bottom plate;a support block is fixed on the mounting block, and the upper end of the support block is used in cooperation with arc-shaped pressing plate;the upper end of guide block is provided with a part angular pin and is used in cooperation with support bush limiting plate and pipe limiting plate;the side wall of positioning block is provided with a positioning sleeve angular pin, and is used in cooperation with mandrel, positioning sleeve one and positioning sleeve two.The application is convenient and stable to operate, effectively axially limits to guarantee part size, accurately positions welding position;angular pin controls part angular direction, ensures welding precision;through integrated design, a set of tooling is shared by multiple processes, not only saves tooling cost, but also significantly improves production efficiency.

Description

Technical Field

[0001] This invention relates to a welding fixture for a combustion chamber fuel supply ring assembly and its usage method, belonging to the field of welding fixture technology. Background Technology

[0002] As an indispensable component of the combustion chamber, the fuel supply ring assembly plays a crucial role in ensuring a stable fuel supply. This assembly is typically composed of multiple individual pieces connected through a precision welding process to ensure that fuel is evenly and efficiently distributed into the combustion chamber, thereby maintaining stable engine operation.

[0003] In traditional welding processes, each individual component of the oil supply ring assembly often requires a separately designed and used fixture for positioning and fixation. This one-to-one fixture approach is not only cumbersome, increasing the complexity and labor costs of the production process, but also particularly disadvantageous in terms of economics. With the aerospace industry's ever-increasing demands for production efficiency and quality, traditional welding fixture solutions are no longer sufficient to meet current production needs.

[0004] To overcome the above-mentioned shortcomings and improve production efficiency and economic benefits, the industry urgently needs a more practical and efficient welding fixture. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention provides a fixture for welding combustion chamber fuel supply ring pipe assembly and a method for using the same.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding fixture for a combustion chamber fuel supply ring assembly, comprising a base plate, a support sleeve, a support block, an arc-shaped pressure plate, a guide block, a part angular pin, a positioning sleeve angular pin, a positioning block, a support bushing limiting plate, a pipe fitting limiting plate, a mandrel, a mounting block, a positioning sleeve one, a positioning sleeve two, and a pressure plate assembly; the upper surface of the base plate is sequentially equipped with the support sleeve, the mounting block, the guide block, and the positioning block; the upper end of the support sleeve cooperates with multiple pressure plate assemblies, each of which is mounted on the base plate; a support block is fixed on the mounting block, and the upper end of the support block cooperates with the arc-shaped pressure plate; the upper end of the guide block is provided with a part angular pin and cooperates with the support bushing limiting plate and the pipe fitting limiting plate; the side wall of the positioning block is provided with a positioning sleeve angular pin and cooperates with the mandrel, positioning sleeve one, and positioning sleeve two.

[0007] Each of the pressure plate assemblies includes a support, a bolt, and a pressure plate; the lower end of the support is inserted into the base plate, the lower end of the bolt is threaded into the base plate, and the upper end of the support and the upper end of the bolt are slidably connected to the pressure plate.

[0008] The support block includes an integrally formed horizontal plate, vertical plate, and angle plate. The horizontal plate is connected to the mounting block. The tilt angle of the angle plate is adapted to the slope of the pipe fitting. The end of the angle plate is provided with a V-groove. The V-groove is used in conjunction with the arc-shaped pressure plate.

[0009] The guide block is a cuboid frame with a vertical slot in the middle. A component corner pin is interference-fitted into the upper end of one side plate of the guide block, and a fastening screw is inserted into the other side plate of the guide block.

[0010] The support bushing limiting plate has a cuboid structure, with an n-shaped opening in the middle. The lower ends of both sides of the n-shaped opening have clearance openings, and the upper sides of the support bushing limiting plate have weight-reducing openings. The upper surface of the support bushing limiting plate has large chamfers on both sides of the top corners.

[0011] The positioning block is provided with a socket for inserting a mandrel, positioning sleeve one and positioning sleeve two. The lower end of the positioning block is interference-fitted with a positioning sleeve angular pin, and the upper end of the positioning block is threadedly screwed with a locking screw. The lower end of the locking screw extends into the socket.

[0012] The spindle includes a first insertion part, a second insertion part, a third insertion part, and a first handle part, all integrally formed and coaxially arranged in sequence. The diameters of the first insertion part, the second insertion part, and the third insertion part increase sequentially, and the diameter of the third insertion part matches the insertion hole of the positioning block.

[0013] The positioning sleeve includes an integrally formed cylinder, a limiting frustum, and a handle portion two arranged coaxially. The diameter of the limiting frustum is larger than the diameter of the cylinder and the diameter of the handle portion two. The diameter of the cylinder matches the insertion hole of the positioning block. The end of the cylinder is provided with a stepped hole with a diameter decreasing inward. The small hole of the stepped hole matches the outer diameter of the corresponding part. The outer wall of the end of the cylinder is threaded with multiple clamping screws. The lower end of each clamping screw extends into the large hole of the stepped hole, and the end of each clamping screw is provided with a U-shaped ball head. The limiting frustum of the positioning sleeve has a cutting clearance.

[0014] The positioning sleeve 2 includes an integrally formed, coaxially arranged insertion part 4, insertion part 5, limiting part, and handle part 3. The diameters of insertion part 4, insertion part 5, and limiting part increase sequentially. The diameter of insertion part 5 matches the insertion hole of the positioning block. The end of insertion part 4 is provided with a straight blind hole. The end of the straight blind hole is provided with two straight grooves. Each straight groove is engaged with two pillars of the corresponding part. The upper end of the limiting part is provided with a flat relief, and the lower end of the limiting part is provided with a relief groove. The relief groove is engaged with the angular pin of the positioning sleeve.

[0015] A method for using a welding fixture for a combustion chamber fuel supply ring assembly according to the present invention includes the following steps:

[0016] S1: Install the oil supply ring into the upper end of the support sleeve, and use the pressure plate assembly to press and fix the oil supply ring;

[0017] S2: After connecting one end of the pipe fitting to the oil supply ring, place it on the support block for initial fixation;

[0018] S3: Insert the pipe fitting limiting plate into the guide block;

[0019] S4: After passing the mandrel through the positioning block, insert it into the other end of the tube;

[0020] S5: Press the pipe fitting with the arc-shaped pressure plate and tighten the mandrel with the locking screw;

[0021] S6: Perform welding at welding position one;

[0022] S7: Remove the mandrel and fitting limit plate;

[0023] S8: Install the support bushing so that the angular groove of the support bushing is engaged with the angular pin of the part;

[0024] S9: Insert the support bushing limiting plate into the guide block and press the support bushing limiting plate tightly. Then tighten the support bushing limiting plate with screws. Press the mounting edge of the support bushing with the support bushing limiting plate so that one side of the mounting edge of the support bushing is in contact with the reference surface of the support bushing limiting plate.

[0025] S10: Install the oil inlet pipe;

[0026] S11: After passing the positioning sleeve through the positioning block, use the clamping screw to clamp the A side of the oil inlet pipe;

[0027] S12: After pushing the positioning sleeve tight, use the locking screw to tighten and fix it;

[0028] S13: Perform welding at welding position two;

[0029] S14: Remove positioning sleeve one;

[0030] S15: Install the protective sleeve;

[0031] S16: Pass the second positioning sleeve through the positioning block, and use the angular pin of the positioning sleeve to determine the angular direction of the second positioning sleeve;

[0032] S17: Secure the second positioning sleeve with the locking screw;

[0033] S18: Weld positions three and four to complete the overall welding of the combustion chamber fuel supply ring pipe components.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] This invention employs a detachable fixing structure for the support sleeve and pressure plate, which is convenient to operate and the support sleeve is replaceable. The design of the support block and arc-shaped pressure plate conforms to the shape of the pipe fitting, ensuring stable fixing. The cooperation between the limiting plate and the guide block effectively limits the axial position to ensure the size of the part. The positioning block, mandrel and positioning sleeve and other components accurately position the welding position. The angular pin controls the angular direction of the part to ensure welding accuracy. Through integrated design, multiple processes can share a set of tooling, which not only saves tooling costs but also significantly improves production efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 yes Figure 1 BB section view;

[0038] Figure 3 This is a structural schematic diagram of the supporting bushing limiting plate;

[0039] Figure 4 This is a structural schematic diagram of the pipe fitting limiting plate;

[0040] Figure 5 This is a schematic diagram of the mandrel structure;

[0041] Figure 6 This is a structural schematic diagram of the positioning sleeve;

[0042] Figure 7 This is a structural schematic diagram of the positioning sleeve 2;

[0043] Figure 8 yes Figure 7 The main view. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] A welding fixture for a combustion chamber fuel supply ring assembly includes a base plate 1, a support sleeve 3, a support block 12, an arc-shaped pressure plate 13, a guide block 15, a part angular pin 17, a positioning sleeve angular pin 21, a positioning block 22, a support bushing limiting plate 26, a pipe fitting limiting plate 27, a mandrel 28, a mounting block 32, a positioning sleeve one 30, a positioning sleeve two 35, and a pressure plate assembly.

[0046] The base plate 1 is a cuboid plate with two symmetrical U-shaped openings on both sides along the length axis; large chamfers are made at the four corners and four threaded holes are symmetrically distributed along the four corners; the upper surface of the base plate 1 is sequentially equipped with a support sleeve 3, a mounting block 32, a guide block 15 and a positioning block 22 along the length axis.

[0047] Specifically:

[0048] The base plate 1 has a large hole on its left side, with six threaded holes and one pin hole around its perimeter. The support sleeve 3 is a frustum structure with a mounting edge. The outer diameter of its lower end matches the large hole in the base plate 1. It has a mounting edge on its lower center side, with six countersunk holes and one pin hole evenly distributed around its perimeter. Corresponding screws are installed in the countersunk holes and threaded holes of the base plate 1 and support sleeve 3, respectively, to tighten the support sleeve 3. Corresponding cylindrical pins are installed in the pin holes of the base plate 1 and support sleeve 3, serving to prevent rotation of the support sleeve 3 and facilitating its centering, angular positioning, and tightening. The support sleeve 3 has a stepped hole with a countersunk top along its central axis. The upper end of the stepped hole mates with the oil supply ring for centering the oil supply ring. A small hole is also located on the upper surface of the stepped hole for mounting a corresponding angular pin. This angular pin prevents the oil supply ring from rotating.

[0049] The base plate 1 has four pin holes and two threaded holes symmetrically arranged along its length axis at the middle left position. The mounting block 32 is a cuboid structure and also has four corresponding pin holes and two threaded holes. Corresponding cylindrical pins are installed in the pin holes and corresponding screws are installed in the threaded holes, which facilitates the installation and fixing of the mounting block 32.

[0050] The base plate 1 has six holes on the right side of the middle, two for mounting pins and four for screwing screws, so as to fix the guide block 15.

[0051] The base plate 1 has four threaded holes and two pin holes on the right side to fix and tighten the positioning block 22;

[0052] Meanwhile, six weight-reducing holes are provided in the base plate 1 at locations that do not affect the installation of components.

[0053] The upper end of the support sleeve 3 is used in conjunction with a plurality of pressure plate assemblies evenly distributed along its circumference, and each pressure plate assembly is mounted on the base plate 1;

[0054] A support block 12 is fixed on the mounting block 32, and the upper end of the support block 12 is used in conjunction with the arc-shaped pressure plate 13.

[0055] The upper end of the guide block 15 is provided with a part angular pin 17, which is used in conjunction with the support bushing limiting plate 26 and the pipe fitting limiting plate 27; the support bushing limiting plate 26 and the pipe fitting limiting plate 27 ensure the axial dimensions X1 and X2 during welding.

[0056] The side wall of the positioning block 22 is provided with a positioning sleeve angular pin 21, which is used in conjunction with the spindle 28, positioning sleeve one 30 and positioning sleeve two 35.

[0057] Each of the pressure plate assemblies includes a support 5, a bolt 8, and a pressure plate 9; the lower end of the support 5 is inserted into the base plate 1, the lower end of the bolt 8 is threaded into the base plate 1, and the upper ends of the support 5 and the bolt 8 are slidably connected to the pressure plate 9.

[0058] Support 5 supports pressure plate 9 and has a nut at its upper end to prevent pressure plate 9 from loosening. A washer is placed between bolt 8 and pressure plate 9 to protect pressure plate 9 from scratches when bolt 8 is tightened. Bolt 8 is screwed into base plate 1 to tighten pressure plate 9. Pressure plate 9 is designed with a horizontal folded hook structure to accommodate the assembly of oil supply ring and support sleeve 3. A threaded hole is opened on the right side of the horizontal plate for installing support 5, and a waist hole is opened in the middle for installing bolt 8 to facilitate the pre-tightening of support 5 and bolt 8. A copper layer of a certain thickness is applied to the area where the oil supply ring is pressed against the hook protrusion to prevent damage to the oil supply ring.

[0059] The support block 12 includes an integrally formed horizontal plate, vertical plate, and angle plate. The horizontal plate is connected to the mounting block 32. Specifically, the horizontal plate has two slotted holes, and the mounting block 32 has a countersunk hole at its central axis. Countersunk screws are screwed into the slotted holes and the corresponding countersunk holes to fix the support block 12 and facilitate its movement within the mounting block 32. The angle plate has an inclination angle adapted to the pipe fitting's slope. A V-groove is provided at the central axis of the end of the angle plate to facilitate pipe fitting shaping. The V-groove works in conjunction with the arc-shaped pressure plate 13 to press the pipe fitting tightly.

[0060] The arc-shaped pressure plate 13 has a cuboid structure with two holes symmetrically opened along the central axis, which facilitates the screws to be screwed into the support block 12 to press the arc-shaped pressure plate 13. At the same time, an arc-shaped groove is opened at the central axis position and the surface is covered with a copper layer of a certain thickness, which matches the pipe diameter and can prevent the pipe from being damaged when pressing the pipe.

[0061] The guide block 15 is a cuboid frame with a vertical slot in the middle. The slot facilitates the insertion of the bushing limiting plate 26 and the pipe fitting limiting plate 27 to limit the position of the parts. The four corners of the slot have been cleaned. There are four threaded holes and two pin holes at the four bottom corners of the cuboid, which facilitates the clamping with the base plate 1 by cylindrical pins and screws. The upper end of one side plate of the guide block 15 is interference-fitted with a part corner pin 17, which serves as an anti-rotation function. The other side plate of the guide block 15 is evenly distributed with four fastening screws 16, which are used for pre-tightening during the installation of the bushing limiting plate 26 and the pipe fitting limiting plate 27.

[0062] The support bushing limiting plate 26 has a cuboid structure. An n-shaped opening is provided in the lower end face of the middle of the support bushing limiting plate 26. The n-shaped opening is used to position the support bushing. Alternating straight openings are provided at the lower ends of both sides of the n-shaped opening to avoid interference with the support bushing during insertion. One side of the support bushing limiting plate 26 has high flatness and parallelism requirements for axial positioning of the support bushing. Two symmetrical threaded holes are provided along the center line of the n-shaped opening to facilitate screwing in and tightening the support bushing. Weight-reducing straight openings are provided symmetrically on both sides of the upper end of the support bushing limiting plate 26 along the central axis, reducing weight and facilitating handling. Large chamfers are provided at the two top corners of the upper surface of the support bushing limiting plate 26 to facilitate manufacturing while preventing sharp edges from scratching and increasing safety.

[0063] The pipe fitting limiting plate 27 has the same structure as the support bushing limiting plate 26. Since it only needs axial limiting and does not need to be pressed, there are no screw holes on the pipe fitting limiting plate 27.

[0064] The positioning block 22 has six holes symmetrically arranged on both sides of its base along its central axis. Two holes are used to connect the positioning block 22 to the base plate 1 with cylindrical pins, and four holes are used to press the positioning block 22 into place with screws. The top two sides of the positioning block 22 are chamfered to improve manufacturability. The positioning block 22 has insertion holes extending through its thickness direction, with chamfered openings. These insertion holes are used to insert the mandrel 28, positioning sleeve one 30, and positioning sleeve two 35 to limit the positioning of corresponding parts. The lower end of the positioning block 22 has a small blind hole for interference fitting of a positioning sleeve angular pin 21. The upper end of the positioning block 22 is threadedly connected to a locking screw 20, the lower end of which extends into the insertion hole. The locking screw 20 is used to fix the mandrel 28, positioning sleeve one 30, and positioning sleeve two 35. The locating sleeve angular pin 21 has the same structure as the part angular pin 17. Its purpose is to determine the angular direction of the locating sleeve 35. By controlling the angular direction of the locating sleeve 35, the angular direction of the corresponding part is constrained.

[0065] The mandrel 28 includes three integrally formed, coaxially arranged insertion parts: insertion part one, insertion part two, insertion part three, and handle part one. The diameters of insertion parts one, two, and three increase sequentially. Insertion part one is inserted into a welded pipe fitting, insertion part two is inserted into a part that mates with the pipe fitting, limiting the coaxiality of the two parts. The diameter of insertion part three matches the insertion hole of the positioning block 22, limiting the overall height of the pipe fitting. The handle part one has a rolled texture to facilitate manual operation.

[0066] The positioning sleeve 30 comprises an integrally formed cylinder, a limiting frustum, and a handle portion arranged coaxially. The diameter of the limiting frustum is larger than the diameter of the cylinder and the diameter of the handle portion. The diameter of the cylinder matches the insertion hole of the positioning block 22. The end of the cylinder has a stepped hole with a decreasing diameter inward. The small hole of the stepped hole matches the outer diameter of the corresponding part and has a chamfered bottom to prevent interference with the part. The large hole of the stepped hole is used to avoid the outer diameter of the part. The outer wall of the end of the cylinder is threaded with multiple clamping screws 29 evenly distributed around its circumference. The lower end of each clamping screw 29 extends into the large hole of the stepped hole, and the end of each clamping screw 29 has a U-shaped ball head to clamp the part when screwed into the positioning sleeve 30. The limiting frustum of the positioning sleeve 30 has a cutting clearance to avoid the positioning sleeve angular pin 21 during installation, making it convenient to use.

[0067] The positioning sleeve 35 includes an integrally formed, coaxially arranged insertion part four, insertion part five, limiting part, and handle part three. The diameters of the insertion part four, insertion part five, and limiting part increase sequentially. The diameter of the insertion part five matches the insertion hole of the positioning block 22. The end of the insertion part four is provided with a straight blind hole along the axial direction. The bottom of the straight blind hole has a chamfered root-cleaning structure. Two straight grooves are evenly distributed around the end of the straight blind hole. The bottom of each straight groove still has a root-cleaning structure and is engaged with the two pillars of the corresponding part. The edge of the limiting part is chamfered around the circumference and the upper end is provided with a flat clearance for easy visual installation. The lower end of the limiting part is provided with a clearance groove. The clearance groove is engaged with the angular pin 21 of the positioning sleeve to control the angular orientation of the positioning sleeve 35. Thus, the angular orientation of the corresponding part can be directly controlled through the two straight grooves of the straight blind hole.

[0068] Handle section one, handle section two, and handle section three are all provided with a rolled texture to facilitate manual operation.

[0069] A method for using a welding fixture for a combustion chamber fuel supply ring assembly according to the present invention includes the following steps:

[0070] S1: Install the oil supply ring into the upper end of the support sleeve 3, prevent the oil supply ring from rotating by the angular pin, and press and fix the oil supply ring with the pressure plate assembly;

[0071] S2: After connecting one end of the pipe fitting to the oil supply ring, place it on the support block 12 for initial fixation;

[0072] S3: Insert the pipe fitting limiting plate 27 into the guide block 15 to axially position the pipe fitting;

[0073] S4: After passing the mandrel 28 through the positioning block 22, insert it into the other end of the pipe to limit the height of the pipe;

[0074] S5: The pipe fitting is pressed by the arc-shaped pressure plate 13 and the mandrel 28 is tightened by the locking screw 20;

[0075] S6: Weld position 10;

[0076] S7: Remove the mandrel 28 and the fitting limit plate 27;

[0077] S8: Install the support bushing 11 so that the angular groove of the support bushing 11 is engaged with the angular pin 17 of the part.

[0078] S9: Insert the support bushing limiting plate 26 into the guide block 15, and use screws to press the support bushing limiting plate 26 tightly. Then use screws to tighten the support bushing limiting plate 26. The support bushing limiting plate 26 presses the mounting edge of the support bushing 11 so that one side of the mounting edge of the support bushing 11 is in contact with the reference surface of the support bushing limiting plate 26.

[0079] S10: Install oil inlet pipe 18;

[0080] S11: After the positioning sleeve 30 passes through the positioning block 22, the A surface 23 of the oil inlet pipe 18 is pressed with the clamping screw 29, which can control the axial direction and concentricity of the oil inlet pipe 18.

[0081] S12: After pushing the positioning sleeve 30 tight, use the locking screw 20 to tighten and fix it;

[0082] S13: Weld at welding position 24;

[0083] S14: Remove positioning sleeve 30;

[0084] S15: Install protective sleeve 19;

[0085] S16: Since the sheath 19 can rotate at this time, the positioning sleeve 25 is passed through the positioning block 22, and the angular direction of the positioning sleeve 25 is determined by the angular pin 21 of the positioning sleeve, so as to determine the angular relationship between the support bushing 11 and the sheath 19.

[0086] S17: Secure the positioning sleeve 35 by tightening it with the locking screw 20;

[0087] S18: Welding is performed at welding position 31 and welding position 43 to complete the overall welding of the combustion chamber fuel supply ring pipe parts.

[0088] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0089] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fixture for welding a combustion chamber fuel supply ring assembly, characterized in that: The utility model provides a kind of oil supply ring pressing device, including bottom plate (1), support sleeve (3), support block (12), arc pressing plate (13), guide block (15), part angular pin (17), positioning sleeve angular pin (21), positioning block (22), support bushing limiting plate (26), pipe fitting limiting plate (27), mandrel (28), mounting block (32), positioning sleeve one (30), positioning sleeve two (35) and pressing plate assembly;The upper surface of the bottom plate (1) is sequentially provided with support sleeve (3), mounting block (32), guide block (15) and positioning block (22);The upper end of the support sleeve (3) is used with a plurality of pressing plate assemblies, each pressing plate assembly is mounted on the bottom plate (1), and the oil supply ring is pressed and fixed;The mounting block (32) is fixed with support block (12), and the upper end of the support block (12) is used with arc pressing plate (13);The upper end of the guide block (15) is provided with part angular pin (17) and is used with support bushing limiting plate (26) and pipe fitting limiting plate (27);The side wall of the positioning block (22) is provided with positioning sleeve angular pin (21), and is used with mandrel (28), positioning sleeve one (30) and positioning sleeve two (35);The support block (12) includes integrally formed horizontal plate, vertical plate and angle plate, and the inclination angle of the angle plate is adapted to the inclination of the pipe fitting;The guide block (15) is a cuboid frame with a vertical slot in the middle, the slot facilitates the insertion of the support bushing limiting plate (26) and the pipe fitting limiting plate (27) to limit the parts, and the upper end of one side plate of the guide block (15) is inserted with part angular pin (17) in an interference fit, and the other side plate of the guide block (15) is inserted with a fastening screw (16);The support bushing limiting plate (26) is a cuboid structure, and an n-shaped opening is formed in the middle of the support bushing limiting plate (26) and penetrates the lower end surface thereof, and the n-shaped opening is used for positioning the support bushing;The installation edge of the support bushing (11) is pressed by the support bushing limiting plate (26), so that one side of the installation edge of the support bushing (11) is attached to the reference surface of the support bushing limiting plate (26);The positioning block (22) is provided with a hole, and the hole is used for inserting the mandrel (28), the positioning sleeve one (30) and the positioning sleeve two (35);The mandrel (28) includes integrally formed insertion part one, insertion part two, insertion part three and handle part one arranged coaxially in sequence, the insertion part one is inserted into the welded pipe, the insertion part two is inserted into the part matched with the pipe, and the coaxiality of the two parts is limited, the diameter of the insertion part three is matched with the hole of the positioning block (22), and the overall height of the pipe fitting is limited;The positioning sleeve one (30) includes integrally formed cylinder, limiting circular platform and handle part two arranged coaxially in sequence, the diameter of the cylinder is matched with the hole of the positioning block (22), the end of the cylinder is provided with a stepped hole with diameter decreasing inward, and the small hole of the stepped hole is matched with the outer diameter of the corresponding part.The positioning sleeve 2 (35) includes an integrally formed, coaxially arranged insertion part 4, insertion part 5, limiting part, and handle part 3. The diameter of the insertion part 5 matches the insertion hole of the positioning block (22). The end of the insertion part 4 is provided with a straight blind hole, and the end of the straight blind hole is provided with two straight grooves. Each straight groove is engaged with two pillars of the corresponding part.

2. The welding fixture for a combustion chamber fuel supply ring assembly according to claim 1, characterized in that: Each of the pressure plate assemblies includes a support (5), a bolt (8), and a pressure plate (9); the lower end of the support (5) is inserted into the base plate (1), the lower end of the bolt (8) is threaded into the base plate (1), and the upper end of the support (5) and the upper end of the bolt (8) are slidably connected to the pressure plate (9).

3. The welding fixture for a combustion chamber fuel supply ring assembly according to claim 1, characterized in that: The horizontal plate is connected to the mounting block (32), and the end of the angle plate is provided with a V-groove, which is used in conjunction with the arc-shaped pressure plate (13).

4. The welding fixture for a combustion chamber fuel supply ring assembly according to claim 1, characterized in that: The lower ends of the two sides of the n-shaped opening are provided with clearance straight openings, the upper ends of the support bushing limiting plate (26) are provided with weight reduction straight openings, and the upper surfaces of the support bushing limiting plate (26) are provided with large chamfers at the top corners on both sides.

5. The welding fixture for a combustion chamber fuel supply ring assembly according to claim 1, characterized in that: The lower end of the positioning block (22) is interference-fitted with a positioning sleeve angular pin (21), and the upper end of the positioning block (22) is threadedly screwed with a locking screw (20). The lower end of the locking screw (20) extends into the insertion hole.

6. The welding fixture for a combustion chamber fuel supply ring assembly according to claim 5, characterized in that: The diameters of the first, second, and third insertion parts increase sequentially.

7. A welding fixture for a combustion chamber fuel supply ring assembly according to claim 6, characterized in that: The diameter of the limiting truncated cone is greater than the diameter of the cylinder and the diameter of the handle part 2; the outer wall of the end of the cylinder is threadedly connected to a plurality of clamping screws (29), the lower end of each clamping screw (29) extends into the large hole of the stepped hole, and the end of each clamping screw (29) is provided with a U-shaped ball head, and the limiting truncated cone of the positioning sleeve 1 (30) is provided with cutting avoidance.

8. A welding fixture for a combustion chamber fuel supply ring assembly according to claim 6, characterized in that: The diameters of the fourth insertion part, the fifth insertion part, and the limiting part increase sequentially. The upper end of the limiting part is provided with a flat relief, and the lower end of the limiting part is provided with a relief groove. The relief groove is configured to cooperate with the positioning sleeve angular pin (21).

9. A method of using a welding fixture for a combustion chamber fuel supply ring assembly according to any one of claims 1-8, characterized in that: The method includes the following steps: S1: Install the oil supply ring into the upper end of the support sleeve (3) and press and fix the oil supply ring with the pressure plate assembly; S2: After connecting one end of the pipe fitting to the oil supply ring, place it on the support block (12) for initial fixation; S3: Insert the pipe fitting limiting plate (27) into the guide block (15); S4: Pass the mandrel (28) through the positioning block (22) and insert it into the other end of the tube; S5: Press the pipe fitting with the arc-shaped pressure plate (13) and tighten the mandrel (28) with the locking screw (20); S6: Weld at welding position one (10); S7: Remove the mandrel (28) and the fitting limit plate (27); S8: Install the support bushing (11) so that the angular groove of the support bushing (11) is engaged with the angular pin (17) of the part; S9: Insert the support bushing limiting plate (26) into the guide block (15), press the support bushing limiting plate (26) tightly, and then tighten the support bushing limiting plate (26) with screws. Press the mounting edge of the support bushing (11) with the support bushing limiting plate (26) so that one side of the mounting edge of the support bushing (11) is in contact with the reference surface of the support bushing limiting plate (26). S10: Install oil inlet pipe (18); S11: After passing the positioning sleeve (30) through the positioning block (22), use the clamping screw (29) to clamp the A side (23) of the oil inlet pipe (18). S12: After pushing the positioning sleeve (30) tight, use the locking screw (20) to tighten and fix it; S13: Welding is performed on welding position two (24); S14: Remove positioning sleeve one (30); S15: Install the protective sleeve (19); S16: Pass the second positioning sleeve (35) through the positioning block (22) and use the angular pin (21) of the positioning sleeve to determine the angular direction of the second positioning sleeve (35); S17: Secure the positioning sleeve 2 (35) with the locking screw (20); S18: Welding is performed on welding position three (31) and welding position four (33) to complete the overall welding of the combustion chamber fuel supply ring pipe parts.

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