A riveting tool for a narrow space large driven adjusting piece and a replacement method

Abstract

The application discloses a riveting tool for large driven adjusting sheet in narrow space and a replacement method, and the riveting tool comprises a right clamp rod, an expanded pin, a supporting pin, a locking screw, a pin shaft, a left clamp rod, an adjusting nut and a screw rod. The right clamp rod and the left clamp rod are hinged through the pin shaft, the same end of the right clamp rod and the left clamp rod is respectively provided with the expanded pin and the supporting pin, and the distance between the expanded pin and the supporting pin is adjusted through the adjusting nut and the screw rod between the right clamp rod and the left clamp rod. The application can directly replace the large driven adjusting sheet on the airplane engine by using the riveting tool without disassembling the airplane engine and without disassembling the combustion chamber and the nozzle, so that the replacement period of the large driven adjusting sheet is shortened, and the replacement cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of riveting technology for aero-engine parts assembly, and in particular to a riveting tool and replacement method for a large driven adjustment plate in a narrow space. Background Technology

[0002] The nozzle trimmer of an aircraft engine is primarily used to adjust the nozzle area, ensuring the engine operates at its optimal state at various altitudes and speeds. This is because nozzle adjustment mainly affects two aspects: First, it alters the engine's thrust. By adjusting the nozzle area, thrust can be increased or decreased, which is crucial for aircraft acceleration and deceleration. Second, it controls the engine's combustion efficiency. In fighter jets, the use of afterburners allows the engine to provide greater thrust when needed, and the nozzle trimmer plays a key role in this process.

[0003] The structure of the nozzle is as follows Figure 1 As shown, four large driven adjusting vanes 9 are designed in the nozzle. Due to the special assembly and connection structure of these large driven adjusting vanes 9, they vibrate at a higher frequency and wear faster than other large driven adjusting vanes. After the large driven adjusting vanes 9 reach the end of their service life, all four large driven adjusting vanes 9 need to be replaced uniformly in the engine. However, the large driven adjusting vanes 9 are located on the innermost side of the nozzle, alternating with the large active adjusting vanes in the circumferential direction. The outer side contains parts such as the hydraulic actuator cylinder assembly 10, connecting rod 12, beam 13, and outer adjusting vane 14. The large driven adjusting vanes 9 and the small driven adjusting vanes 11 are riveted together with flared ends, and the diameter of the riveting pin 16 is 10mm. In addition, the large driven adjusting vanes 9 are adjacent to the hydraulic actuator cylinder assembly 10, and the space is narrow. Currently, there are no high-power riveting tools available for this narrow space structure.

[0004] The current process for replacing the large driven adjusting vane is as follows: after detaching the engine from the aircraft, the afterburner components are disassembled and transported back to the engine repair shop for nozzle disassembly, a new large driven adjusting vane 9 is installed, riveted on a hydraulic press, the nozzle is then reassembled and tested, and finally the afterburner components are transported back to the aircraft factory for assembly. Under this existing method, the nozzle driven adjusting vane replacement cycle is long, wasting enormous human, material, and financial resources, which is detrimental to the goal of strengthening military preparedness. Summary of the Invention

[0005] The present invention aims to provide a riveting tool and replacement method for a large driven adjustment plate in a narrow space, so as to solve the problems of long replacement cycle and high cost of the large driven adjustment plate of the existing engine nozzle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A riveting tool for a large driven adjusting piece in a narrow space, comprising:

[0008] The right clamp bar has a first countersunk round hole and a first small threaded hole that are perpendicular to each other and connected at the first end of the length direction of the right clamp bar, and a square groove at the second end of the length direction of the right clamp bar. Two lugs arranged at intervals are also provided between the first end and the second end of the length direction of the right clamp bar as a hinge seat. The lugs have a first round hole and a lug groove is formed between the two lugs.

[0009] The left clamp bar has a second countersunk round hole and a second small threaded hole that are perpendicular to and connected to each other at its first end along the length direction. A lug is also provided between the first end and the second end along the length direction of the left clamp bar. The lug has a second round hole. A light hole is provided at the second end along the length direction of the left clamp bar.

[0010] A support pin is installed in a second countersunk hole, and the end of the support pin is flat.

[0011] A flared pin, wherein the flared pin is installed in a first countersunk hole, and the end of the flared pin has a tapered surface;

[0012] Locking screws, the two locking screws are respectively installed in the first small threaded hole and the second small threaded hole and respectively press the support pin and the flared pin;

[0013] The screw includes a cubic head and a shank with external threads. The head of the screw is embedded in the square groove of the right clamp, and the shank of the screw passes through the light hole of the left clamp.

[0014] An adjusting nut is fitted onto the external thread of the screw rod and is located between the smooth hole and the square groove.

[0015] The lug of the left clamp is inserted into the lug groove of the right clamp, and the pin is simultaneously inserted into the first and second round holes, so that the right and left clamps are hinged to each other.

[0016] Alternatively, both the right and left clamps have square cross-sections perpendicular to their length.

[0017] A method for replacing a large driven adjusting plate in a narrow space includes:

[0018] Without disassembling the aircraft engine or disassembling the combustion chamber and nozzle, the replacement is performed directly on the aircraft engine using the riveting tools described in the claims. The replacement process includes the following steps:

[0019] Step 1: Adjust the nozzle hydraulic actuator system to maximize the spatial distance between the hydraulic actuator assembly and the large driven vane.

[0020] Step 2: Identify the old, large driven adjusting plate that needs to be replaced, and remove the corresponding external adjusting plate.

[0021] Step 3: Grind off the cylindrical end of the old rivet pin that connects the old large driven adjusting plate and the small driven adjusting plate, remove the old rivet pin, and take off the old large driven adjusting plate.

[0022] Step 4: Replace the large driven adjusting plate with a new one by passing the new rivet pin through the new large driven adjusting plate and the small driven adjusting plate.

[0023] Step 5: Use the flaring pin and support pin of the riveting tool to clamp the two ends of the new riveting pin shaft respectively, and rotate the adjusting nut on the riveting tool to reduce the distance between the flaring pin and the support pin until the flaring size of the new riveting pin shaft meets the riveting requirements.

[0024] Step 6: Install the external adjustment plate to complete the replacement operation.

[0025] As an option:

[0026] In step three, the old gasket is removed;

[0027] In step four, a new washer is placed on the surface of the small driven adjustment piece, and then a new riveting pin is passed through the new large driven adjustment piece and the small driven adjustment piece.

[0028] Compared with the prior art, the present invention has the following characteristics:

[0029] (1) The present invention can be adapted to the riveting of large driven adjustment plates with different specifications of nozzles by replacing the flaring pin and support pin in the riveting tool;

[0030] (2) The riveting tool of the present invention is small in size and occupies little space (the left clamp bar and the right clamp bar are in the same plane), which can adapt to the narrow space between the large driven adjustment plate and the hydraulic actuator cylinder assembly. The support pin and flaring pin of the riveting tool can be sent into the riveting position of the large driven adjustment plate and the small driven adjustment plate by extending the length of the left clamp bar and the right clamp bar.

[0031] (3) The riveting tool of the present invention has a simple structure and is easy and labor-saving to operate. A skilled worker can quickly replace the driven adjustment plate on the aircraft. The cooperation between the adjustment nut and the screw can save effort and operating space. The hinged connection between the left clamp rod and the right clamp rod can increase the force arm.

[0032] (4) This invention avoids the waste of manpower, material resources and financial resources caused by disassembling engine nozzle components to replace large driven adjustment, and has broad application value. Attached Figure Description

[0033] Figure 1 This is a partial schematic diagram of the aero-engine nozzle of the present invention;

[0034] Figure 2This is a schematic diagram showing the connection relationship of the large driven adjustment plate of the nozzle in this invention;

[0035] Figure 3 for Figure 2 Schematic diagram of the CC section (before the driven adjusting plate is riveted);

[0036] Figure 4 This is a schematic diagram of the nozzle driven adjustment plate after riveting according to the present invention;

[0037] Figure 5 This is a schematic diagram of the riveting tool structure of the present invention;

[0038] Figure 6 This is a schematic diagram of the left clamp bar structure of the riveting tool of the present invention;

[0039] Figure 7 This is a schematic diagram of the right clamp bar structure of the riveting tool of the present invention;

[0040] In the diagram: 1. Right clamp rod; 2. Flared pin; 3. Support pin; 4. Locking screw; 5. Pin; 6. Left clamp rod; 7. Adjusting nut; 8. Screw; 9. Large driven adjusting plate; 10. Hydraulic actuator cylinder assembly; 11. Small driven adjusting plate; 12. Connecting rod; 13. Beam; 14. Outer adjusting plate; 15. Washer; 16. Riveting pin; 101. First small threaded hole; 102. First countersunk round hole; 103. First round hole; 104. Lug groove; 105. Square groove; 601. Second small threaded hole; 602. Second countersunk round hole; 603. Second round hole; 604. Lug; 605. Plain hole. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0042] like Figures 5-7 As shown, this invention provides a riveting tool for large driven adjustment plates in confined spaces, which can directly replace the large driven adjustment plate 9 on the engine.

[0043] The riveting tool includes a right clamp 1, a flared pin 2, a support pin 3, a locking screw 4, a pin 5, a left clamp 6, an adjusting nut 7, and a screw 8. Both ends of the left clamp 6 are square structures. One end has a smooth hole 605 for connecting the screw 8, and the other end has a second countersunk hole 602 and a second small threaded hole 601. A lug 604 is provided in the upper middle part of the left clamp 6, with a second round hole 603 on the lug. Both ends of the right clamp 1 are square structures. One end has a square groove 105, and the other end has a first countersunk hole 102 and a first small threaded hole 101. The upper middle part of the right clamp 1 has two lugs, each with a first round hole 103, forming a lug groove 104 between the two lugs. The left clamp 6 and the right clamp 1 are connected by the lug 604 inserted into the lug groove 104 and the first round hole 103 inserted into the second threaded hole 601. The pin 5 of the round hole 603 is hinged (with a gap connection), allowing the left clamp 6 and the right clamp 1 to rotate relative to each other around the pin 5. One end of the screw 8 has an external thread, and the other end is a square block. The screw 8 passes through the smooth hole 605 on the left clamp 6, and the square block of the screw 8 is placed in the square groove 105 of the right clamp. The adjusting nut 7 has a hexagonal shape and is connected to the screw 8, located between the square groove 105 and the smooth hole 605. One end of the support pin 3 is fitted into the second countersunk round hole 602 of the left clamp 6 and fixed with a locking screw 4 inserted into the second small threaded hole 601. One end of the flared pin 2 is fitted into the first countersunk round hole 102 of the right clamp 1 and fixed with a locking screw 4 inserted into the first small threaded hole 101. Rotating the adjusting nut 7 reduces the distance between the support pin 3 and the flared pin 2, thus achieving riveting.

[0044] The method for replacing the large driven adjustment plate in a narrow space according to the present invention includes the following steps:

[0045] (1) such as Figure 1 Adjust the nozzle hydraulic actuator system to maximize the spatial distance between the hydraulic actuator assembly 10 and the large driven adjustment plate 9;

[0046] (2) For example Figure 1 and Figure 2 Identify the old, large driven adjusting plate 9 that needs to be replaced, and remove the corresponding external adjusting plate 14.

[0047] (3) Grind off the cylindrical end of the old riveting pin 16 that connects the old large driven adjusting plate 9 and the small driven adjusting plate 11, remove the old riveting pin 16, and remove the old large driven adjusting plate 9.

[0048] (4) Replace the large driven adjusting plate 9 and the new washer 15, and use a new riveting pin 16 to pass through the new large driven adjusting plate 9 and the small driven adjusting plate 11, as follows. Figure 3 ;

[0049] (5) Using the flaring pin 2 and support pin 3 of the riveting tool, clamp the two ends of the new riveting pin 16 respectively. Rotate the adjusting nut 7 on the riveting tool to reduce the distance between the flaring pin 2 and support pin 3 until the flaring size of the new riveting pin 16 meets the riveting requirements, such as... Figure 4 ;

[0050] (6) Reassemble the external adjustment plate 14, such as Figure 1 and Figure 2 .

[0051] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for replacing a large driven adjusting plate in a narrow space, characterized in that, include: Replacement is performed directly on the aircraft engine using a large-scale driven adjusting plate riveting tool in a confined space, without disassembling the aircraft engine or disassembling the combustion chamber and nozzle. This confined-space, large-scale driven adjusting plate riveting tool includes: The right clamp rod (1) has a first countersunk round hole (102) and a first small threaded hole (101) that are perpendicular to each other and connected at the first end of the length direction of the right clamp rod (1). The second end of the right clamp rod (1) has a square groove (105). Two lugs arranged at intervals are provided between the first end and the second end of the right clamp rod (1) as a hinge seat. The lugs have a first round hole (103) and a lug groove (104) is formed between the two lugs. The left clamp rod (6) has a second countersunk round hole (602) and a second small threaded hole (601) that are perpendicular to each other and connected at the first end of the left clamp rod (6) along its length. A lug (604) is also provided between the first end and the second end of the left clamp rod (6) along its length. A second round hole (603) is provided on the lug (604). A light hole (605) is provided at the second end of the left clamp rod (6) along its length. Support pin (3), the support pin (3) is installed in the second countersunk round hole (602), and the end of the support pin (3) is flat; A flared pin (2) is installed in a first countersunk hole (102), and the end of the flared pin (2) has a tapered surface; Locking screws (4), the two locking screws (4) are respectively installed in the first small threaded hole (101) and the second small threaded hole (601) and respectively press the support pin (3) and the flared pin (2); The screw (8) includes a cubic head and a shank with external threads. The head of the screw (8) is embedded in the square groove (105) of the right clamp (1), and the shank of the screw (8) passes through the light hole (605) of the left clamp (6). Adjusting nut (7), which is sleeved on the external thread of the screw (8) and is located between the smooth hole (605) and the square groove (105); The lug (604) of the left clamp (6) is inserted into the lug groove (104) of the right clamp (1), and the pin (5) is simultaneously inserted into the first round hole (103) and the second round hole (603), so that the right clamp (1) and the left clamp (6) are hinged to each other. The replacement process includes the following steps: Step 1: Adjust the nozzle hydraulic actuator system so that the spatial distance between the hydraulic actuator assembly (10) and the large driven adjustment plate (9) is at its maximum position; Step 2: Identify the old large driven adjusting plate (9) that needs to be replaced and remove the corresponding external adjusting plate (14). Step 3: Grind off the cylindrical end of the old rivet pin (16) that connects the old large driven adjusting plate (9) and the small driven adjusting plate (11), remove the old rivet pin (16), and take off the old large driven adjusting plate (9). Step 4: Replace the new large driven adjusting plate (9) and pass the new riveting pin (16) through the new large driven adjusting plate (9) and the small driven adjusting plate (11). Step 5: Use the flaring pin (2) and support pin (3) of the riveting tool to clamp the two ends of the new riveting pin (16) respectively, rotate the adjusting nut (7) on the riveting tool to reduce the distance between the flaring pin (2) and support pin (3) until the flaring size of the new riveting pin (16) meets the riveting requirements. Step 6: Install the external adjustment plate (14) to complete the replacement operation.

2. The method for replacing a large driven adjusting plate in a narrow space according to claim 1, characterized in that: In step three, the old washer (15) is removed; In step four, a new washer (15) is placed on the surface of the small driven adjustment piece (11), and then a new riveting pin (16) is passed through the new large driven adjustment piece (9) and the small driven adjustment piece (11).

3. The method for replacing a large driven adjusting plate in a narrow space according to claim 1, characterized in that: The cross-sections of the right clamp (1) and the left clamp (6) perpendicular to the length direction are both square.

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