Fuel line welding fixture and method for engine repair

Abstract

The present application relates to the technical field of aero-engine repair, and particularly relates to an oil pipe welding clamp and method in an engine repair process. The clamp comprises a positioning plate, which is provided with an arc-shaped through slot; a first scale line is uniformly distributed on the top surface along the arc direction of the arc-shaped through slot; a sliding block is in sliding cooperation with the arc-shaped through slot; a telescopic rod assembly comprises an outer tube body vertically installed on the top surface of the sliding block and an inner tube body slidingly inserted into the outer tube body; a height identification line and a vertical angular reference line are arranged on the outer circumferential surface of the inner tube body; a second scale line is annularly and uniformly distributed on the top surface of the outer tube body; an adjusting seat is installed on the top of the inner tube body; a scale pin comprises a sliding cooperation section and a positioning section integrally formed on the end of the sliding cooperation section; the sliding cooperation section is in sliding cooperation with the through hole of the adjusting seat, and a third scale line is arranged on the sliding cooperation section; an annular protrusion is arranged between the positioning section and the sliding cooperation section; and a connecting sleeve is rotatably installed on the scale pin.

Description

Technical Field

[0001] This invention relates to the field of aircraft engine repair technology, and in particular to a welding fixture and method for fuel lines during engine repair. Background Technology

[0002] During engine repair, the main and auxiliary fuel lines in the internal combustion chamber need to be disassembled for inspection and repair. After inspection and repair, the fuel lines need to be reassembled and welded. The main and auxiliary fuel lines connect to the No. 3 engine casing and the combustion chamber casing at both ends, and each fuel line consists of two sections, which are welded together using bushings. There are specific dimensional requirements for the relative positions of the bushings and the lines. Previously, to determine the welding position of the fuel lines, the combustion chamber casing, the No. 3 engine casing, and another intermediate component needed to be assembled before the fuel lines were tack welded. This process was cumbersome, and X-ray inspection was required after welding. The assembled height was nearly 1 meter, making operation inconvenient.

[0003] Therefore, adjusting the position of oil pipelines during welding is inconvenient, and there is an urgent need to provide an oil pipeline welding fixture to facilitate clamping the oil pipeline to be welded and adjusting its position. Summary of the Invention

[0004] The main objective of this invention is to provide a welding fixture for fuel lines during engine repair, aiming to solve the aforementioned technical problems.

[0005] To achieve the above objectives, in one aspect, the present invention provides a fuel line welding fixture for engine repair, comprising:

[0006] The positioning plate has an arc-shaped through groove; the top surface has first scale lines evenly distributed along the arc direction of the arc-shaped through groove.

[0007] The sliding block slides in conjunction with the arc-shaped through groove.

[0008] The telescopic rod assembly includes an outer tube vertically mounted on the top surface of a sliding block and an inner tube slidably inserted into the outer tube; a height marking line and a vertical angular reference line are provided on the outer circumferential surface of the inner tube; and a second scale line is evenly distributed in a ring on the top surface of the outer tube.

[0009] Adjustment seat, installed on the top of the inner tube;

[0010] The graduated pin includes a sliding engagement section and a positioning section integrally formed at the end of the sliding engagement section; the sliding engagement section slides with the through hole of the adjustment seat, and a third graduation line is provided on the sliding engagement section; an annular protrusion is provided between the positioning section and the sliding engagement section;

[0011] A connecting sleeve is rotatably mounted on the graduated pin. An internal thread is provided in the inner hole of the connecting sleeve for engaging with the external thread of the oil pipeline end.

[0012] Preferably, a first tightening screw is screwed onto the top of the adjusting seat to tighten the scale pin.

[0013] Preferably, the scale pin further includes a handle section; the positioning section and the handle section are integrally formed at both ends of the sliding engagement section; anti-slip knurling is provided on the outer peripheral surface of the handle section; a locking groove is provided on the sliding engagement section, and the first tightening screw is tightened in the locking groove; a cutting plane is provided on the handle section.

[0014] Preferably, the annular protrusion abuts against the stepped surface of the inner hole of the connecting sleeve.

[0015] Preferably, an arc-shaped positioning protrusion is integrally formed on the bottom surface of the positioning plate, and the inner arc-shaped surface of the arc-shaped positioning protrusion and the bottom surface of the positioning plate together form a positioning stop.

[0016] Preferably, an arc-shaped protrusion is integrally formed on the bottom surface of the sliding block, and the sliding block slides in cooperation with the arc-shaped through groove through the arc-shaped protrusion.

[0017] Preferably, the telescopic rod assembly further includes a second tightening screw screwed onto the outer tube body, the second tightening screw being used to tighten the inner tube body.

[0018] On the other hand, the present invention also proposes a method for welding fuel lines during engine repair, using the aforementioned fuel line welding fixture, comprising the following steps:

[0019] S1. Fixture installation: Install the oil pipe welding fixture on the mounting side of the combustion chamber casing using the positioning plate;

[0020] S2. Initial positioning: Adjust the position of the sliding block, adjust the height and angular position of the inner tube on the telescopic rod assembly, and adjust the position of the scale pin on the adjusting seat so that the positioning section of the scale pin can be inserted into the inner hole of the oil pipe end.

[0021] S3. Parameter recording: When the positioning section is inserted into the inner hole of the oil pipeline end and the annular protrusion abuts against the end face of the oil pipeline, the circumferential position of the sliding block is recorded using the first scale line, the height position of the inner tube is recorded using the height mark line, the angular position of the inner tube relative to the outer tube is recorded using the angular reference line and the second scale line, and the radial position of the scale pin is recorded using the third scale line.

[0022] S4. Remove the oil pipeline: Pull the scale pin out of the oil pipeline end, adjust the position of the sliding block and lower the inner tube, remove the oil pipeline and send it for inspection and repair.

[0023] S5. Post-repair installation: After the oil pipeline has been inspected and repaired, install the oil pipeline on the positioning section of the scale pin, match the internal thread of the connecting sleeve with the external thread of the oil pipeline end, and tighten the connecting sleeve so that the end face of the oil pipeline abuts against the annular protrusion.

[0024] S6. Precise reset: Adjust the positions of the sliding block, inner tube, and scale pin to make them consistent with the positions recorded in step S3;

[0025] S7. Weld the oil pipeline.

[0026] Preferably, in step S1, a positioning pin is inserted into the positioning plate, and the positioning pin cooperates with the pin hole on the mounting side of the combustion chamber casing; the positioning plate and the mounting side of the combustion chamber casing are fastened together by connecting bolts.

[0027] Preferably, in step S6, when the position of the sliding block is adjusted to the correct position, a locking bolt is inserted between the sliding block and the positioning plate for locking; when the height and angular position of the inner tube are adjusted to the correct position, the second tightening screw is screwed onto the outer tube to tighten the inner tube; when the radial position of the scale pin is adjusted to the correct position, the first tightening screw is screwed onto the top of the adjusting seat to tighten the scale pin.

[0028] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0029] (1) The oil pipeline welding fixture provided by the present invention can record the position of the oil pipeline before disassembly. After the oil pipeline is repaired, it can be quickly restored for welding, which greatly improves work efficiency and facilitates inspection.

[0030] (2) The present invention reduces the cumbersome steps in the assembly process and lowers the difficulty of operation by using the positioning and adjustment functions of the fixture.

[0031] (3) The present invention realizes the position recording function through the scale, which ensures the precise assembly of the oil pipeline and improves the welding quality. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the oil pipeline welding fixture provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the positioning plate in this invention;

[0035] Figure 3 This is a schematic diagram of the overall structure of the adjusting seat and the inner tube in this invention;

[0036] Figure 4 This is a schematic diagram showing the fit between the telescopic rod assembly, the adjusting seat, and the scale pin in this invention;

[0037] Figure 5 This is a front view of the outer tube body in this invention;

[0038] Figure 6 This is a cross-sectional view of the outer tube in this invention;

[0039] Figure 7 for Figure 6 View A in the middle;

[0040] Figure 8 This is a front view of the scale pin in this invention;

[0041] Figure 9 This is a top view of the graduated pin in this invention;

[0042] Figure 10 This is a cross-sectional view of the connecting sleeve in this invention;

[0043] Figure 11 This is a schematic diagram showing the usage state of the oil pipeline welding fixture provided by the present invention.

[0044] Explanation of reference numerals: 1. Positioning plate; 1a. Arc-shaped positioning protrusion; 1b. Positioning stop; 1c. Arc-shaped through groove; 1d. First scale line; 2. Telescopic rod assembly; 2a. Outer tube; 2b. Inner tube; 2c. Second tightening screw; 2d. Height marking line; 2e. Second scale line; 2f. Angular reference line; 3. Positioning pin; 4. Adjusting seat; 4a. Through hole; 5. Scale pin; 5a. Third scale line; 5b. Positioning section; 5c. Sliding fit section; 5d. Handle section; 5e. Locking groove; 5f. Cutting plane; 5g. Annular protrusion; 6. Connecting sleeve; 7. Sliding block; 8. First tightening screw; 9. Locking bolt; 10. Combustion chamber casing; 11. Connecting bolt. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0048] Combination Figures 1 to 10 As shown, this embodiment provides a fuel line welding fixture for engine repair, comprising:

[0049] Positioning plate 1 is used to install on the mounting side of combustion chamber casing 10. An arc-shaped through groove 1c is provided on the positioning plate 1. First scale lines 1d are evenly distributed on the top surface along the arc direction of the arc-shaped through groove 1c.

[0050] The sliding block 7 is slidably engaged with the arc-shaped through groove 1c;

[0051] The telescopic rod assembly 2 includes an outer tube 2a vertically mounted on the top surface of the sliding block 7 and an inner tube 2b slidably inserted on the outer tube 2a; a height marking line 2d and a vertical angular reference line 2f are provided on the outer circumferential surface of the inner tube 2b; and a second scale line 2e is evenly distributed in a ring on the top surface of the outer tube 2a.

[0052] Adjusting seat 4 is installed on the top of inner tube 2b; specifically, adjusting seat 4 is welded to the top of inner tube 2b.

[0053] The scale pin 5 includes a sliding engagement section 5c and a positioning section 5b integrally formed at the end of the sliding engagement section 5c; the sliding engagement section 5c is slidably engaged with the through hole 4a of the adjustment seat 4, and a third scale line 5a is provided on the sliding engagement section 5c; an annular protrusion 5g is provided between the positioning section 5b and the sliding engagement section 5c.

[0054] Connecting sleeve 6 is rotatably mounted on the graduated pin 5. An internal thread is provided in the inner hole of the connecting sleeve 6 for mating with the external thread of the oil pipeline end.

[0055] Combination Figure 1 As shown, a first tightening screw 8 is screwed onto the top of the adjusting seat 4 to tighten the scale pin 5.

[0056] Combination Figure 8 and Figure 9 As shown, the graduated pin 5 also includes a handle section 5d; the positioning section 5b and the handle section 5d are integrally formed at both ends of the sliding engagement section 5c; the outer peripheral surface of the handle section 5d is provided with anti-slip knurling; a locking groove 5e is provided on the sliding engagement section 5c, and the first tightening screw 8 is tightened in the locking groove 5e; a cutting plane 5f is provided on the handle section 5d. The cutting plane 5f and the locking groove 5e are located on the same side. Specifically, when the cutting plane 5f faces upward, the locking groove 5e also faces upward. Therefore, the cutting plane 5f serves as an indicator to indicate the direction of the locking groove 5e. The purpose of providing the handle section 5d is to facilitate the operator's grip, thereby facilitating the operator to pull out the graduated pin 5 to adjust the position of the graduated pin 5 relative to the adjusting seat 4. The purpose of providing anti-slip knurling on the outer peripheral surface is to provide an anti-slip function.

[0057] Combination Figure 4 and Figure 10 As shown, the annular protrusion 5g abuts against the stepped surface of the inner hole of the connecting sleeve 6. The annular protrusion 5g serves to axially limit the movement of the connecting sleeve 6. Specifically, the left half of the inner hole of the connecting sleeve 6 is an M14×1.5 threaded hole, and the right half is a mating hole, with a relief groove provided between the mating hole and the threaded hole. The mating hole is slidably fitted onto the sliding mating section 5c of the graduated pin 5. The left end face of the mating hole abuts against the right end face of the annular protrusion 5g.

[0058] Combination Figure 1 As shown, an arc-shaped positioning protrusion 1a is integrally formed on the bottom surface of the positioning plate 1, and the inner arc-shaped surface of the arc-shaped positioning protrusion 1a and the bottom surface of the positioning plate 1 together form a positioning stop 1b.

[0059] In this embodiment, an arc-shaped protrusion (not shown in the figure) is integrally formed on the bottom surface of the sliding block 7, and the sliding block 7 slides in conjunction with the arc-shaped through groove 1c through the arc-shaped protrusion.

[0060] Combination Figure 1 As shown, the telescopic rod assembly 2 also includes a second tightening screw 2c screwed onto the outer tube 2a, the second tightening screw 2c being used to tighten the inner tube 2b.

[0061] Combination Figure 5 , Figure 7As shown, the outer end of the second scale line 2e extends downwards along the outer periphery of the top of the outer tube 1a by a length h, and each second scale line 2e is numerically represented. When the angular reference line 2f aligns with one of the second scale lines 2e, it can be used to indicate the angular direction of the inner tube 2b.

[0062] Combination Figure 10 As shown, this embodiment also provides a method for welding fuel lines during engine repair, using the aforementioned fuel line welding fixture, and includes the following steps:

[0063] S1. Fixture installation: The oil pipe welding fixture is installed on the mounting side of the combustion chamber casing 10 through the positioning plate 1; further, the positioning stop 1b is used to lock onto the mounting side of the combustion chamber casing 10, and a positioning pin 3 is inserted on the positioning plate 1, which cooperates with the pin hole on the mounting side of the combustion chamber casing 10; the positioning plate 1 and the mounting side of the combustion chamber casing 10 are fastened together by the connecting bolt 11.

[0064] S2. Initial positioning: Adjust the position of the sliding block 7, adjust the height and angular position of the inner tube 2b on the telescopic rod assembly 2, and adjust the position of the scale pin 5 on the adjusting seat 4 so that the positioning section 5b of the scale pin 5 can be inserted into the inner hole of the oil pipeline end.

[0065] S3. Parameter Recording: When the positioning section 5b is inserted into the inner hole of the oil pipe end, and the annular protrusion 5g abuts against the end face of the oil pipe, the circumferential position of the sliding block 7 is recorded using the first scale line 1d, the height position of the inner tube 2b is recorded using the height marking line 2d, the angular position of the inner tube 2b relative to the outer tube 2a is recorded using the angular reference line 2f and the second scale line 2e, and the radial position of the scale pin 5 is recorded using the third scale line 5a. Specifically, the axial position of the sliding block 7 can be recorded by reading the first scale line 1d corresponding to the edge of the sliding block 7 end. The height position of the inner tube 2b can be recorded by reading the height marking line 2d corresponding to the top of the outer tube 2a. The angular position of the inner tube 2b relative to the outer tube 2a can be recorded by reading the second scale line 2e aligned with the angular reference line 2f. The radial position of the scale pin 5 can be recorded by reading the third scale line 5a corresponding to the end face of the adjusting seat 4.

[0066] S4. Remove the oil pipeline: Pull the scale pin 5 out of the oil pipeline end, adjust the position of the sliding block 7 and lower the inner tube 2b, remove the oil pipeline and send it for inspection and repair.

[0067] S5. Post-repair installation: After the oil pipeline has been inspected and repaired, install the oil pipeline on the positioning section 5b of the scale pin 5. The internal thread of the connecting sleeve 6 matches the external thread of the oil pipeline end, and tighten the connecting sleeve 6 so that the end face of the oil pipeline abuts against the annular protrusion 5g.

[0068] S6. Precise Reset: Adjust the positions of the sliding block 7, inner tube 2b, and scale pin 5 to match the positions recorded in step S3. Specifically, by observing the first scale line 1d, height marking line 2d, angular reference line 2f, second scale line 2e, and third scale line 5a, ensure that the positions of each component are completely consistent with the original record, thereby ensuring that the oil pipe remains consistent with its position before disassembly. Further, when the position of the sliding block 7 is adjusted to the correct position, a locking bolt 9 is inserted between the sliding block 7 and the positioning plate 1 for locking; when the height and angular position of the inner tube 2b are adjusted to the correct position, the second tightening screw 2c is screwed onto the outer tube 2a to tighten the inner tube 2b; when the radial position of the scale pin 5 is adjusted to the correct position, the first tightening screw 8 is screwed onto the top of the adjusting seat 4 to tighten the scale pin 5.

[0069] S7. Weld the oil pipeline. After welding is completed, the oil pipeline welding fixture can be removed.

[0070] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A welding fixture for fuel lines during engine repair, characterized in that, include: The positioning plate (1) has an arc-shaped through groove (1c) on it; the top surface is evenly distributed with first scale lines (1d) along the arc direction of the arc-shaped through groove (1c). The sliding block (7) is in sliding engagement with the arc-shaped through groove (1c); The telescopic rod assembly (2) includes an outer tube (2a) vertically mounted on the top surface of the sliding block (7) and an inner tube (2b) slidably inserted into the outer tube (2a); a height marking line (2d) and a vertical angular reference line (2f) are provided on the outer circumferential surface of the inner tube (2b); and a second scale line (2e) is evenly distributed in a ring on the top surface of the outer tube (2a). Adjustment seat (4) is installed on the top of the inner tube body (2b); The graduated pin (5) includes a sliding engagement section (5c) and a positioning section (5b) integrally formed at the end of the sliding engagement section (5c); the sliding engagement section (5c) is slidably engaged with the through hole (4a) of the adjusting seat (4), and a third graduation line (5a) is provided on the sliding engagement section (5c); an annular protrusion (5g) is provided between the positioning section (5b) and the sliding engagement section (5c); Connecting sleeve (6), the connecting sleeve (6) is rotatably mounted on the scale pin (5), and an internal thread is provided in the inner hole of the connecting sleeve (6) for cooperating with the external thread of the oil pipeline end; A first tightening screw (8) is screwed onto the top of the adjusting seat (4) to tighten the scale pin (5); The graduated pin (5) also includes a handle section (5d); the positioning section (5b) and the handle section (5d) are integrally formed at both ends of the sliding fit section (5c); The outer peripheral surface of the handle section (5d) is provided with anti-slip knurling; A locking groove (5e) is provided on the sliding fit section (5c), and the first tightening screw (8) is tightened in the locking groove (5e); A cutting plane (5f) is provided on the handle section (5d).

2. The fuel line welding fixture for engine repair as described in claim 1, characterized in that, The annular protrusion (5g) abuts against the stepped surface of the inner hole of the connecting sleeve (6).

3. The fuel line welding fixture for engine repair as described in claim 2, characterized in that, An arc-shaped positioning protrusion (1a) is integrally formed on the bottom surface of the positioning plate (1), and the inner arc-shaped surface of the arc-shaped positioning protrusion (1a) and the bottom surface of the positioning plate (1) together form a positioning stop (1b).

4. The oil pipe welding fixture in the engine repair process as described in claim 3, characterized in that, An arc-shaped protrusion is integrally formed on the bottom surface of the sliding block (7), and the sliding block (7) slides in cooperation with the arc-shaped through groove (1c) through the arc-shaped protrusion.

5. The fuel line welding fixture for engine repair as described in claim 4, characterized in that, The telescopic rod assembly (2) further includes a second tightening screw (2c) screwed onto the outer tube (2a), the second tightening screw (2c) being used to tighten the inner tube (2b).

6. A method for welding fuel lines during engine repair, characterized in that, The method of using the oil pipeline welding fixture according to claim 5 includes the following steps: S1. Fixture installation: Install the oil pipe welding fixture on the mounting side of the combustion chamber casing (10) through the positioning plate (1); S2, Initial positioning: Adjust the position of the sliding block (7), adjust the height and angular position of the inner tube (2b) on the telescopic rod assembly (2), and adjust the position of the scale pin (5) on the adjusting seat (4) so ​​that the positioning section (5b) of the scale pin (5) can be inserted into the inner hole of the oil pipeline end; S3. Parameter recording: When the positioning section (5b) is inserted into the inner hole of the oil pipe end and the annular protrusion (5g) abuts against the end face of the oil pipe, the circumferential position of the sliding block (7) is recorded using the first scale line (1d), the height position of the inner tube body (2b) is recorded using the height mark line (2d), the angular position of the inner tube body (2b) relative to the outer tube body (2a) is recorded using the angular reference line (2f) and the second scale line (2e), and the radial position of the scale pin (5) is recorded using the third scale line (5a). S4. Remove the oil pipeline: Pull the scale pin (5) out of the end of the oil pipeline, adjust the position of the sliding block (7) and lower the inner tube (2b), remove the oil pipeline and send it for inspection and repair. S5. Post-repair installation: After the oil pipeline is inspected and repaired, install the oil pipeline on the positioning section (5b) of the scale pin (5), match the internal thread of the connecting sleeve (6) with the external thread of the oil pipeline end, and tighten the connecting sleeve (6) so that the end face of the oil pipeline abuts against the annular protrusion (5g). S6. Precise reset: Adjust the positions of the sliding block (7), inner tube (2b), and scale pin (5) to keep them consistent with the positions recorded in step S3; S7. Weld the oil pipeline.

7. The method for welding fuel lines during engine repair as described in claim 6, characterized in that, In step S1, a positioning pin (3) is inserted into the positioning plate (1), and the positioning pin (3) cooperates with the pin hole on the mounting side of the combustion chamber casing (10); the positioning plate (1) and the mounting side of the combustion chamber casing (10) are fastened together by connecting bolts (11).

8. The method for welding fuel lines during engine repair as described in claim 6, characterized in that, In step S6, When the position of the sliding block (7) is adjusted to the correct position, a locking bolt (9) is inserted between the sliding block (7) and the positioning plate (1) for locking. When the height and angular position of the inner tube (2b) are adjusted to the correct position, the second tightening screw (2c) is screwed onto the outer tube (2a) to tighten the inner tube (2b); When the radial position of the scale pin (5) is adjusted to the correct position, the first tightening screw (8) is screwed into the top of the adjusting seat (4) to tighten the scale pin (5).

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