Composite fixture, composite flushing method and aero-engine

Abstract

The application discloses a composite clamp, a composite flushing method and an aero-engine. The composite clamp is used for being arranged in a flushing device to clamp a machine case workpiece and comprises a positioning platform arranged in the flushing device, a clamping platform provided with a clamping assembly and used for clamping the machine case workpiece, and a turnover mechanism arranged on the positioning platform and connected with the clamping platform and used for driving the clamping platform to turn over. The clamping assembly comprises a connecting piece, and the connecting piece comprises a connecting port matched with the position of a cavity port and a flow passage port of the machine case workpiece. The limiting mechanism is used for fixing the clamping platform when the clamping platform is turned over to a target angle position, so that the machine case workpiece is located at a target flushing posture station. The multiple posture turnover flushing mode realized by the clamping assembly realizes all-round composite flushing of multiple positions such as an inner cavity, an air inlet edge oil circuit and an exhaust edge oil circuit, effectively solves the problem that the flushing effect of positions such as an oil circuit blockage point and a deposition inflection point is poor, and greatly improves the flushing effect and the flushing efficiency.

Description

Technical Field

[0001] This invention relates to the field of aero-engine processing and manufacturing technology, and in particular to a composite fixture, a composite flushing method, and an aero-engine. Background Technology

[0002] During the operation of aircraft engines, problems such as bearing slippage, damage, nozzle blockage, and lubrication failure can occur due to foreign matter. With the increasing frequency of engine use, these problems are becoming more prominent, and foreign matter alarms are occurring more frequently, seriously affecting flight safety. Foreign matter control is therefore urgently needed. These foreign matter, such as iron filings, dust, and sand particles, are often found in the oil passages and precision cavities of various components; they are diverse in type and size.

[0003] To meet the high-precision and high-intensity requirements of aero-engines, cleanliness requirements have been raised to control the number of particles 20µm in size and above. This increased cleanliness standard renders current technologies for controlling foreign matter in components too limited and inapplicable.

[0004] A key aspect of foreign matter control technology is flushing away foreign matter from the oil passages and internal cavities of components. (Reference) Figures 1 to 3 Taking a certain type of complex rotating casing as an example, it has a precision inner cavity, an outer ring-shaped cavity, and multiple vertically connected cross-oil passages. Its flushing method mainly involves positive pressure oil passage and inner cavity flushing, which mainly includes the following:

[0005] (1) Use high flash point organic solvents or aviation kerosene at a flushing pressure of 1 to 1.2 MPa;

[0006] (2) The upper and lower end faces of the casing are supported by each other, facing downwards, and are flushed in an axial posture;

[0007] (3) Use one end of the oil passage as the oil inlet to flush each oil passage with positive pressure; use one side of the inner cavity to spray and flush the inner cavity.

[0008] (4) The above-mentioned oil circuit flushing and internal cavity spraying are performed intermittently 8 to 10 times, and the flushing time is controlled within 3 minutes each time.

[0009] (5) The above steps need to be repeated until the equipment filter screen is free of visible foreign matter and the cleanliness of the parts is qualified.

[0010] Due to the complex internal structure of the parts and oil passages, during forward flushing, there are localized problems such as poor flow of flushing fluid and accumulation of excess material at corners or intersections of the internal cavities and oil passages, resulting in incomplete cleaning of the parts. During subsequent engine use, engine vibration can loosen the deposited material on the parts, causing it to flow into the fuel lines and lead to carbon buildup on the fuel injectors, or into the lubricating oil passages and cause partial failure of the lubrication system.

[0011] Current flushing methods only address the issue of foreign matter deposits in the internal cavities of parts and oil passage corners, dead corners, semi-enclosed cavities, or blockages by repeatedly flushing. Therefore, the current situation of incomplete foreign matter flushing and low flushing efficiency has not been improved. Summary of the Invention

[0012] This invention provides a composite fixture, a composite flushing method, and an aero-engine to solve the technical problem in the prior art where the aero-engine casing accumulates excess material after long-term use, requiring repeated flushing with unreasonable and low cleaning efficiency.

[0013] The technical solution adopted in this invention is as follows:

[0014] A composite clamp for clamping a housing workpiece within a rinsing device, the composite clamp comprising:

[0015] A positioning platform is installed inside the rinsing equipment;

[0016] A clamping platform is provided with a clamping assembly for clamping a casing workpiece. The clamping assembly includes a connector, which includes a connection port that matches the position of the cavity opening and the flow channel opening of the casing workpiece.

[0017] A flipping mechanism is provided on the positioning platform and connected to the clamping platform, and is used to drive the clamping platform to flip.

[0018] A limiting mechanism is used to fix the clamping platform when it is flipped to the target angle position, thereby positioning the casing workpiece in the target flushing posture position.

[0019] As a further improvement to the above technical solution, the flipping mechanism includes a support frame symmetrically distributed on the positioning platform, the support frame being rotatably connected to a rotating rod, and the inner end of the rotating rod being provided with a fixing component for clamping the clamping platform.

[0020] As a further improvement to the above technical solution, the limiting mechanism includes a mating hole radially opened at the outer end of the rotating rod, and a pin block is installed on one side of the support frame corresponding to the outer end of the rotating rod. A fixing pin for mating with the mating hole is provided on the pin block along the radial direction of the rotating rod. The mating angle between each mating hole and the fixing pin is respectively matched with the target flushing posture position of the clamped casing workpiece.

[0021] As a further improvement to the above technical solution, the top end of the support frame is provided with a first arc-shaped groove for engaging with the outer wall of the rotating rod. The limiting mechanism also includes a pressure block. The first end of the pressure block is hinged to one side of the top end of the support frame. The pressure block is provided with a second arc-shaped groove for engaging with the outer wall of the rotating rod. The second end of the pressure block is provided with a limiting component for limiting the rotation angle of the pressure block and thus adjusting the clamping force applied by the pressure block to the rotating rod.

[0022] As a further improvement to the above technical solution, the clamping platform has a positioning hole in the middle for the small end of the casing to pass through, and multiple clamping components are evenly distributed around the positioning hole; the clamping component includes a pressure plate arranged radially along the positioning hole, the middle part of the pressure plate is connected to the clamping platform via a double-ended screw, the first end of the pressure plate is away from the positioning hole and an adjusting support is provided between it and the clamping platform, and the first end of the pressure plate is used to press against the circular boss of the casing workpiece to clamp and fix the casing workpiece to the clamping platform.

[0023] As a further improvement to the above technical solution, the pressure plate is provided with a fastening groove for engaging with the circular boss.

[0024] As a further improvement to the above technical solution, the composite clamp also includes a simulation device set on the positioning platform for simulating the engine working state during the rinsing process.

[0025] According to another aspect of the present invention, a composite rinsing method is also provided, employing any of the composite fixtures described above, the composite rinsing method comprising:

[0026] S1. Clamp the machine casing workpiece, adjust it to the first flushing posture position through the composite fixture, so that the first end is facing down, and the connector of the second end is connected to the pipeline of the flushing equipment.

[0027] S2. Pressurize the second end and intermittently flush the filter for a preset number of times and a preset time for each flush, until the filter screen is free of residue;

[0028] S3. Adjust to the second rinsing posture position, so that the first end is facing down and tilted at a preset angle;

[0029] S4. Pressurize the second end and intermittently flush for a preset number of times, with a preset flushing time each time, until the filter screen is free of residue;

[0030] S5. Adjust to the third rinsing posture position, so that the second end is facing down, and the connector at the first end is connected to the pipeline of the rinsing equipment;

[0031] S6. Pressurize the second end and start the spray, intermittently rinse for a preset number of times and a preset time for each rinse, until there is no residue on the filter screen;

[0032] S7. Adjust to the fourth rinsing posture position, so that the second end is facing down and tilted at a preset angle;

[0033] S8. Pressurize the second end and intermittently flush for a preset number of times, with a preset flushing time each time, until the filter screen is free of residue.

[0034] As a further improvement to the above technical solution, the composite rinsing method further includes: activating a simulation device during the rinsing process.

[0035] According to another aspect of the present invention, an aircraft engine is also provided, which applies any of the above-described composite flushing methods.

[0036] The present invention has the following beneficial effects:

[0037] This composite fixture is used in the rinsing equipment for aero-engine casings. A positioning platform is installed within the rinsing equipment as a carrier. A clamping platform and clamping components work together to clamp the casing workpiece. A flipping mechanism rotates the clamping platform, adjusting the angle of the casing workpiece to the target rinsing position. A limiting mechanism then fixes the clamping platform, thus securing the casing workpiece in the target rinsing position. Simultaneously, a connector is installed on the casing workpiece to connect it to the rinsing pipeline, allowing the rinsing pipeline to communicate with the cavity openings and flow channels on the casing workpiece. Pressure is applied to the casing workpiece at different rinsing positions. The system performs rinsing and spraying of the cavity, flow channel, and outer wall to remove residual and deposited waste. Through the multiple posture flipping rinsing methods achieved by this composite fixture, it realizes all-round composite rinsing of multiple parts such as the inner cavity, the oil passage on the air inlet side, and the oil passage on the exhaust side. It effectively solves the problem of poor rinsing effect at oil passage blockage points and deposition inflection points, and solves the problem of long equipment occupation time and low efficiency caused by repeated rinsing. It significantly improves the rinsing effect and rinsing efficiency, and eliminates the need to set up multiple sets of fixtures to match different rinsing postures, avoiding the problems of high operation intensity and low processing efficiency caused by repeated disassembly and assembly of fixtures.

[0038] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0040] Figure 1 This is a schematic diagram of the internal oil passage structure of a certain type of engine casing in the prior art;

[0041] Figure 2 This is a schematic diagram of the internal cavity structure of a certain type of engine casing in the prior art;

[0042] Figure 3 This is a schematic diagram of the flushing state of a certain type of engine casing in the prior art;

[0043] Figure 4 This is a schematic diagram of the clamp structure according to a preferred embodiment of the present invention;

[0044] Figure 5 This is a top view of the clamp according to a preferred embodiment of the present invention;

[0045] Figure 6 yes Figure 5 Sectional view along direction A;

[0046] Figure 7 yes Figure 5 Sectional view along direction B;

[0047] Figure 8 yes Figure 5 Sectional view along line C;

[0048] Figure 9 yes Figure 5 Sectional view along direction D;

[0049] Figure 10 yes Figure 7 Sectional view along direction E;

[0050] Figure 11 This is a cross-sectional view of the clamping state of a preferred embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the mating hole structure distribution of a preferred embodiment of the present invention;

[0052] Figure 13 This is a schematic diagram of the preferred embodiment of the present invention in use within a rinsing device;

[0053] Figure 14 This is a schematic diagram of the rinsing posture of a preferred embodiment of the present invention. Figure 1 ;

[0054] Figure 15 This is a schematic diagram of the rinsing posture according to a preferred embodiment of the present invention. Figure 2 ;

[0055] Figure 16 This is a schematic diagram of the rinsing posture of a preferred embodiment of the present invention. Figure 3 ;

[0056] Figure 17 This is a schematic diagram of the rinsing posture according to a preferred embodiment of the present invention. Figure 4 ;

[0057] 1. Positioning platform 2. Clamping platform 21. Positioning hole 22. Pressure plate 221. Waist-shaped groove 23. Double-ended screw 24. Adjusting support 25. First nut 26. Second nut 27. Clamping block 271. Fastening groove 3. Flipping mechanism 31. Support frame 311. First arc groove 32. Rotating rod 321. Connecting flange 322. Mating hole 33. Connecting block 34. First bolt 4. Limiting mechanism 41. Pin block 411. Pin hole 42. Fixing pin 43. Pressure block 431. Second arc groove 44. Limiting screw 45. Limiting nut 46. First cylindrical pin 47. Second cylindrical pin. Detailed Implementation

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] Reference Figures 4 to 17 A preferred embodiment of the present invention provides a composite clamp for clamping a casing workpiece within a rinsing device. The composite clamp includes:

[0060] Positioning platform 1 is installed inside the rinsing equipment;

[0061] Clamping platform 2 is provided with clamping components for clamping the casing workpiece. The clamping components include connectors, and the connectors include connecting ports that match the positions of the cavity opening and flow channel opening of the casing workpiece.

[0062] The flipping mechanism 3 is set on the positioning platform 1 and connected to the clamping platform 2, and is used to drive the clamping platform 2 to flip.

[0063] The limiting mechanism 4 is used to fix the clamping platform 2 when it is flipped to the target angle position, thereby making the casing workpiece located in the target flushing posture position.

[0064] It should be understood that the clamping assembly includes multiple connectors, each of which is matched to a different rinsing part; matching connectors are set up for rinsing the corresponding parts under different rinsing postures.

[0065] Understandably, this composite fixture is used in the rinsing equipment for aircraft engine casings. A positioning platform 1 is set up within the rinsing equipment as a carrier, and a clamping platform 2 and clamping components work together to clamp the casing workpiece. A flipping mechanism 3 drives the clamping platform 2 to flip, thereby adjusting the angle of the casing workpiece to the target rinsing posture position. A limiting mechanism 4 fixes the clamping platform 2, thus fixing the casing workpiece in the target rinsing posture position. Simultaneously, by installing connectors on the casing workpiece to connect with the rinsing pipe, the rinsing pipe is connected to the cavity openings and flow channels on the casing workpiece. This allows for different rinsing posture positions. The pressure jet flushes and sprays the cavity, flow channel, and outer wall of the machine casing workpiece, removing residual and deposited excess materials. Through the multiple posture flipping flushing methods achieved by this composite fixture, it realizes all-round composite flushing of multiple parts such as the inner cavity, the oil passage on the air intake side, and the oil passage on the exhaust side. It effectively solves the problem of poor flushing effect at oil passage blockage points and deposition inflection points, and solves the problem of long equipment occupation time and low efficiency caused by repeated flushing. It greatly improves the flushing effect and flushing efficiency, and eliminates the need to set up multiple sets of fixtures to match different flushing postures, avoiding the problems of high operation intensity and low processing efficiency caused by repeated disassembly and assembly of fixtures.

[0066] Furthermore, this composite fixture also includes a simulation device set on the positioning platform 1, which is used to simulate the working state of the engine during the flushing process. The simulation device is a vibrator set below the positioning platform 1. By simulating the vibration conditions under the working state of the engine, the flushing effect is greatly improved, and the excess material deposited in the inner cavity and oil passage is thoroughly removed in conjunction with the flushing equipment.

[0067] In this embodiment, the flipping mechanism 3 includes a support frame 31 symmetrically distributed on the positioning platform 1. The support frame 31 is rotatably connected to a rotating rod 32. The inner end of the rotating rod 32 is provided with a fixing component for clamping the clamping platform 2. The inner end of the rotating rod 32 is provided with a connecting flange 321. The fixing component includes an L-shaped connecting block 33 connected to the connecting flange 321. Through holes are respectively opened on the end face of the clamping platform 2 and the connecting block 33. The connecting block 33 cooperates with one end face and side wall of the clamping platform 2. The clamping platform 2 is fixed by locking it through the through holes of the first bolt 34, and the clamping is stable. After clamping, the axis of the rotating rod 32 is located on the center line of the clamping platform 2, ensuring stability during the flipping process.

[0068] In this embodiment, the limiting mechanism 4 includes a mating hole 322 radially opened at the outer end of the rotating rod 32. A pin block 41 is installed on one side of the support frame 31 corresponding to the outer end of the rotating rod 32. A fixing pin 42 for mating with the mating hole 322 is provided on the pin block 41 radially along the rotating rod 32. The mating angle between each mating hole 322 and the fixing pin 42 is matched with the target flushing posture position of the clamped casing workpiece. For example, in this embodiment, the pin block 41 has four holes, corresponding to four flushing posture positions. When the clamping platform 2 is rotated to the target flushing posture position, the mating hole 322 at the corresponding position matches the pin hole 411 of the pin block 41. The fixing pin 42 passes through the pin hole 411 into the mating hole 322, thereby restricting the rotation of the steering rod and keeping the casing workpiece in the target flushing posture position. The operation is simple.

[0069] Furthermore, the top end of the support frame 31 is provided with a first arc-shaped groove 311 for engaging with the outer wall of the rotating rod 32. The limiting mechanism 4 also includes a pressure block 43. The first end of the pressure block 43 is hinged to one side of the top end of the support frame 31. The pressure block 43 is provided with a second arc-shaped groove 431 for engaging with the outer wall of the rotating rod 32. The second end of the pressure block 43 is provided with a limiting component for limiting the rotation angle of the pressure block 43 and thus adjusting the clamping force applied by the pressure block 43 to the rotating rod 32. Under the action of gravity, the rotating rod 32 engages with the first arc-shaped groove 431. With the groove 311 in place, the limiting component can adjust the opening and closing angle of the pressure block 43 relative to the top of the support frame 31, thereby adjusting the clamping force of the second arc groove 431 and the rotating rod 32. Thus, when flipping the clamping platform 2, the pressure block 43 can be adjusted by the limiting component to adjust the thrust required for flipping the clamping platform 2. Before inserting the fixing pin 42 for fixing, the workpiece of the casing can be initially fixed by adjusting the flipping and limiting components simultaneously. Then, the pin is inserted to complete the final limiting, effectively reducing the difficulty and intensity of operation, and making the operation more convenient.

[0070] Specifically, the limiting component includes a limiting screw 44 fixedly mounted on the support frame 31. The second end of the pressure block 43 has a through hole for the limiting screw 44 to pass through. The limiting nut 45 is threadedly connected to the limiting screw 44 to limit the movement space of the pressure block 43, thereby adjusting the clamping force of the pressure block 43 on the machine housing workpiece. The top end of the support frame 31 has a groove for placing the fixed end of the limiting screw 44. The fixed end of the limiting screw 44 has a radial through hole for the first cylindrical pin 46 to pass through and fix it to the support frame 31. The first end of the pressure block is hinged to the hinge seat at the top of the support frame by passing through a second cylindrical pin 47.

[0071] In this embodiment, the clamping platform 2 has a positioning hole 21 in the middle for the small end of the casing to pass through. Multiple clamping components are evenly distributed around the positioning hole 21 to ensure stable clamping of the casing workpiece. The clamping components include a pressure plate 22 arranged radially along the positioning hole 21. The middle part of the pressure plate 22 is connected to the clamping platform 2 via a double-ended screw 23, thereby adjusting the height of the pressure plate 22 relative to the clamping platform 2 to adapt to the thickness of the circular boss on the outer wall of the casing workpiece. The first end of the pressure plate 22 is away from the positioning hole 21 and an adjusting support 24 is provided between it and the clamping platform 2. The second end of the pressure plate 22 is used to press against the circular boss of the casing workpiece to clamp and fix the casing workpiece to the clamping platform 2. The adjusting support 24 can match the height position of the pressure plate 22 and support it between the first end of the pressure plate 22 and the clamping platform 2, so that the clamping force of the second end of the pressure plate 22 on the casing workpiece is increased, thereby ensuring stable clamping.

[0072] Specifically, the double-ended screw is provided with a first nut 25 and a washer for limiting and fixing, and the adjusting support 24 is provided with a second nut 26 for limiting and fixing.

[0073] Furthermore, the pressure plate 22 is provided with a fastening groove 271 for engaging with the circular boss to match the circular boss structure of the casing workpiece. Specifically, a clamping block 27 is installed on the clamping surface of the second end of the pressure plate 22 and is fixed to the pressure plate 22 by the first screw. The fastening groove 271 is formed in the clamping block 27.

[0074] Furthermore, the pressure plate 22 is provided with a waist-shaped groove 221, which allows the pressure plate 22 to move radially along the positioning hole 21 to match the size of the circular boss of the casing workpiece of different specifications, thereby improving the applicability of the clamping assembly.

[0075] On the other hand, this embodiment also provides a composite rinsing method, which uses the above-mentioned composite fixture, and the composite rinsing method includes:

[0076] S1. Clamp the machine casing workpiece, adjust it to the first flushing posture position through the composite fixture, so that the first end is facing down, and the connector of the second end is connected to the pipeline of the flushing equipment.

[0077] S2. Pressurize the second end and intermittently flush the filter for a preset number of times and a preset time for each flush, until the filter screen is free of residue;

[0078] The number of intermittent rinsing cycles and the duration of each rinsing cycle are set according to the specific workpiece.

[0079] S3. Adjust to the second rinsing posture position, so that the first end is facing down and tilted at a preset angle, which is about 60° in this embodiment;

[0080] S4. Pressurize the second end and intermittently flush for a preset number of times, with a preset flushing time each time, until the filter screen is free of residue;

[0081] S5. Adjust to the third rinsing posture position, so that the second end is facing down, and the connector at the first end is connected to the pipeline of the rinsing equipment;

[0082] S6. Pressurize the second end and start the spray, intermittently rinse for a preset number of times and a preset time for each rinse, until there is no residue on the filter screen;

[0083] S7. Adjust to the fourth rinsing posture position, so that the second end faces down and is tilted at a preset angle, which is about 60° in this embodiment; based on the above rinsing posture setting, the four mating holes 322 can be connected to make them symmetrical, and the fixing pin 42 can pass through the rotating rod 32 to increase the contact area under each rinsing posture, especially the tilted state, to ensure that the limiting and fixing are stable.

[0084] S8. Pressurize the second end and intermittently flush for a preset number of times, with a preset flushing time each time, until the filter screen is free of residue;

[0085] S9. After cleaning, rinse the solution inside the equipment and perform a cleanliness test.

[0086] It should be understood that the composite flushing method also includes: activating the simulation device during the flushing process.

[0087] This flushing method, through the use of a composite fixture, enables simple switching between various flushing postures for the casing workpiece. Simultaneously, by simulating engine operation during the flushing process, it provides appropriate vibration intensity and frequency. Combined with the flushing equipment, it thoroughly removes excess deposits from the internal cavity and oil passages. The flushing effect achieves a new cleanliness level (no more than 506 particles between 25 < Nbr ≤ 50 μm per 100 ml solution; no more than 45 particles between 50 < Nbr ≤ 100 μm per 100 ml solution. No particles larger than 100 μm are present), and the flushing efficiency is improved by 46.7% (the flushing time for a single part is reduced from the existing 3 hours to 1.6 hours).

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite clamp, characterized in that, The composite fixture, used for clamping machine housing workpieces within a rinsing device, comprises: Positioning platform (1) is installed inside the rinsing device; The clamping platform (2) is provided with a clamping assembly for clamping the casing workpiece. The clamping assembly includes a connector, which includes a connection port that matches the position of the cavity opening and the flow channel opening of the casing workpiece. A flipping mechanism (3) is disposed on the positioning platform (1) and connected to the clamping platform (2) for driving the clamping platform (2) to flip. The flipping mechanism (3) includes a support frame (31) symmetrically distributed on the positioning platform (1). The support frame (31) is rotatably connected to a rotating rod (32). The inner end of the rotating rod (32) is provided with a fixing component for clamping the clamping platform (2). The top end of the support frame (31) is provided with a first arc-shaped groove (311) for cooperating with the outer wall of the rotating rod (32). A limiting mechanism (4) is used to fix the clamping platform (2) when it is flipped to the target angle position, thereby placing the casing workpiece in the target flushing posture position. The limiting mechanism (4) also includes a pressure block (43). The first end of the pressure block (43) is hinged to one side of the top of the support frame (31). The pressure block (43) is provided with a second arc-shaped groove (431) for cooperating with the outer wall of the rotating rod (32). The second end of the pressure block (43) is provided with a limiting component for limiting the rotation angle of the pressure block (43) and thereby adjusting the pressure. The block (43) applies a clamping force to the rotating rod (32); the limiting mechanism (4) includes a mating hole (322) radially opened at the outer end of the rotating rod (32), and a pin block (41) is installed on one side of the outer end of the rotating rod (32) on the support frame (31). A fixing pin (42) for mating with the mating hole (322) is provided on the pin block (41) radially along the rotating rod (32). The mating angle between each mating hole (322) and the fixing pin (42) is matched with the target flushing posture position of the clamped casing workpiece.

2. The composite clamp according to claim 1, characterized in that, The clamping platform (2) has a positioning hole (21) in the middle for the small end of the casing to pass through. Multiple clamping components are evenly distributed around the positioning hole (21). Each clamping component includes a pressure plate (22) arranged radially along the positioning hole (21). The middle part of the pressure plate (22) is connected to the clamping platform (2) via a double-ended screw (23). The first end of the pressure plate (22) is away from the positioning hole (21) and an adjusting support (24) is provided between it and the clamping platform (2). The first end of the pressure plate (22) is used to press against the circular boss of the casing workpiece to clamp and fix the casing workpiece to the clamping platform (2).

3. The composite clamp according to claim 2, characterized in that, The pressure plate (22) is provided with a fastening groove (271) for engaging with the circular boss.

4. The composite clamp according to any one of claims 1-3, characterized in that, The composite clamp also includes a simulation device set on the positioning platform (1) for simulating the working state of the engine during the flushing process.

5. A composite rinsing method, characterized in that, The composite clamp according to claim 4 is used, and the composite rinsing method includes: S1. Clamp the machine casing workpiece, adjust it to the first flushing posture position through the composite fixture, so that the first end is facing down, and the connector of the second end is connected to the pipeline of the flushing equipment; S2. Pressurize the second end and intermittently flush the filter for a preset number of times and a preset time for each flush, until the filter screen is free of residue; S3. Adjust to the second rinsing posture position, so that the first end is facing down and tilted at a preset angle; S4. Pressurize the second end and intermittently flush for a preset number of times, with a preset flushing time each time, until the filter screen is free of residue; S5. Adjust to the third rinsing posture position, so that the second end is facing down, and the connector at the first end is connected to the pipeline of the rinsing equipment; S6. Pressurize the second end and start the spray, intermittently rinse for a preset number of times and a preset time for each rinse, until there is no residue on the filter screen; S7. Adjust to the fourth rinsing posture position, so that the second end is facing down and tilted at a preset angle; S8. Pressurize the second end and intermittently flush for a preset number of times, with a preset flushing time each time, until the filter screen is free of residue.

6. The composite rinsing method according to claim 5, characterized in that, The composite rinsing method further includes: activating a simulation device during the rinsing process.

7. An aircraft engine, characterized in that, The application uses the composite rinsing method as described in any one of claims 5 or 6.

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