A maintenance inspection tool for an aeroengine fan case acoustic panel

Abstract

The utility model relates to aero -engine maintenance technical field especially, it relates to a kind of maintenance and inspection tool for aero -engine fan machine case sound-absorbing board, including bottom plate, and the side plate and pin seat fixed to the top of bottom plate, wherein, pin seat is several, its top is equipped with support surface, and pin hole is opened in support surface;The outside of side plate is equipped with several clamps, and the clamping end of clamp is passed through side plate and extends to its inside area, for the side edge of up and down clamping sound-absorbing board;The utility model proposes a kind of maintenance and inspection tool for aero -engine fan machine case sound-absorbing board, to build a special detection platform capable of simulating the original assembly posture of sound-absorbing board in fan machine case, by the positioning and clamping mechanism of structure, the quick, reliable comparison of the outline and edge position of sound-absorbing board after maintenance is realized, to significantly improve the inspection efficiency and consistency, satisfy the actual demand of high-precision, batch detection in the field of aviation maintenance.

Description

Technical Field

[0001] This utility model relates to the field of aircraft engine maintenance technology, and in particular to a maintenance and inspection fixture for the silencer plate of the aircraft engine fan casing. Background Technology

[0002] In aero engines, such as the one disclosed in invention patent CN114837748B, the fan casing, a key component at the front of the engine, encloses the engine fan and has several composite material sound-absorbing plates installed on its inner circumference for noise reduction. During daily operation, these sound-absorbing plates are prone to various types of damage due to frequent impacts from foreign objects, severely affecting their noise reduction performance. Therefore, damaged sound-absorbing plates need to be repaired promptly, and their key geometric dimensions must be rigorously inspected after repair to ensure they meet assembly and functional requirements.

[0003] In the existing technology, the repaired composite material muffler lacks a dedicated inspection platform that can simulate its original assembly state in the fan casing. This makes it difficult to accurately reproduce the installation posture when relying on general measuring tools for manual measurement. It is also impossible to quickly and reliably determine whether the shape and edge position after repair have been restored to the original design state. The inspection efficiency is low and the repeatability is poor, which makes it difficult to meet the needs of aviation maintenance for high consistency batch inspection. Utility Model Content

[0004] In view of this, this utility model proposes a maintenance and inspection fixture for the muffler plate of the aero-engine fan casing. It aims to build a dedicated testing platform that can simulate the original assembly posture of the muffler plate in the fan casing. Through a structured positioning and clamping mechanism, it can achieve rapid and reliable comparison of the outer contour and edge position of the muffler plate after maintenance, thereby significantly improving inspection efficiency and consistency and meeting the actual needs of the aviation maintenance field for high-precision and batch testing.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing, including a base plate, and a side plate and a pin seat fixed to the top of the base plate, wherein... There are two side plates, symmetrically arranged on both sides of the base plate; There are several pin seats, each with a support surface on its top and a pin hole on the support surface. The outer side of the side plate is provided with several clamps, the clamping ends of which pass through the side plate and extend to its inner area, for clamping the side edge of the sound-absorbing plate from above and below.

[0006] Based on the above technical solutions, preferably, the side plate has a first oblong hole on its side, and the clamp includes a nut seat, an adjusting bolt, a first clamping part, and a second clamping part, wherein... The nut seat is fixed to the side of the side plate; The adjusting bolt is screwed to the nut seat, and its lower end is rotatably connected to the first clamping part; The first clamping part and the second clamping part horizontally penetrate the first waist-shaped hole, and the first clamping part is slidably disposed relative to the first waist-shaped hole, while the second clamping part is fixedly disposed relative to the first waist-shaped hole.

[0007] Based on the above technical solutions, preferably, the first clamping part has a countersunk hole at the top and a threaded hole on the side, and the lower end of the adjusting bolt has an annular groove. The lower end of the adjusting bolt is accommodated in the countersunk hole, and the countersunk hole is connected to the threaded hole; The clamp also includes a set screw, which is screwed into the threaded hole and extends into the annular groove.

[0008] Based on the above technical solutions, preferably, the clamp further includes a clamping bolt and a limiting block, wherein, The limiting block is fixed to the outside of the side plate and located below the second clamping part; The bottom of the outer end of the second clamping part is provided with a connecting part, which is fixed to the outside of the side plate by the clamping bolt.

[0009] Based on the above technical solutions, preferably, the connecting portion is provided with a second oblong hole, wherein, One end of the clamping bolt passes through the second waist-shaped hole and is screwed to the side plate.

[0010] Based on the above technical solution, preferably, the clamp further includes a compression spring, wherein, The bottom of the connecting part has a first storage hole, and the top of the limiting block has a second storage hole; One end of the compression spring is housed in the first receiving hole, and the other end is housed in the second receiving hole.

[0011] Based on the above technical solutions, a preferred option also includes a locating pin, wherein... One end of the positioning pin is inserted into the pin hole.

[0012] Based on the above technical solutions, a preferred embodiment also includes a first go / no-go gauge, wherein... When the clamp holds the sound-absorbing plate, a first detection gap is formed between the inner wall of the side plate and the side edge of the sound-absorbing plate; The go end or no-go end of the first go / no-go gauge is selectively inserted into the first detection gap.

[0013] Based on the above technical solutions, a preferred embodiment also includes a second go / no-go gauge, wherein... When the clamp holds the sound-absorbing plate, a second detection gap is formed between the first clamping part and the second clamping part; The go end or no-go end of the second go / no-go gauge is selectively inserted into the second detection gap.

[0014] Based on the above technical solutions, preferably, the side plate has several observation ports on its side.

[0015] The maintenance and inspection fixture for the muffler plate of the aero-engine fan casing of this utility model has the following advantages over the prior art: (1) Through the overall layout of the base plate, symmetrical side plates, multi-point pin seats and fixtures, it is easy to build a special inspection platform that can reproduce the actual assembly environment inside the fan casing. Through the structured positioning and clamping mechanism, it can realize the rapid and reliable comparison of the outline and edge position of the muffler after maintenance, thereby significantly improving inspection efficiency and consistency, and meeting the actual needs of the aviation maintenance field for high-precision and batch testing.

[0016] (2) By setting the positioning pin and the pin hole on the pin seat to fit together, it is easy to simulate the original mounting hole positioning method of the muffler in the fan casing. It can quickly verify whether the position accuracy and geometric dimensions of the mounting hole after repair have been restored to the original design requirements, thus improving the inspection efficiency.

[0017] (3) By setting the first detection gap, it is easy to reflect the fit between its edge contour and the inner wall of the casing. During inspection, the go end or the no-go end of the first go and no-go gauge can be selectively inserted into the gap to intuitively determine whether the edge position is out of tolerance. No complicated instruments are required, thus improving the detection efficiency.

[0018] (4) By setting a second inspection gap, the edge thickness of the soundproof plate can be accurately reflected. During inspection, the second go and no-go gauge can be used to quickly compare the gap, which can accurately verify whether the thickness of the repair area meets the original design tolerance and improve inspection efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a perspective view of a maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing according to the present invention. Figure 2 for Figure 1 Enlarged view of point A; Figure 3 for Figure 2 A schematic diagram of a partial cross-section structure; Figure 4 A schematic diagram of the connection structure between the adjusting bolt and the first clamping part; Figure 5 This is a schematic diagram of the connection structure between the second clamping part and the limiting block; Figure 6 A 3D view of the locating pin; Figure 7 This is the top view of the first go / no-go gauge; Figure 8 This is the top view of the second go / no-go gauge; Figure 9 This is a top view of a maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing according to the present invention. Figure 10 This is a partial structural diagram of a maintenance and inspection fixture for an aircraft engine fan casing muffler plate, showing the muffler plate clamped in place. In the diagram: 1. Base plate; 2. Side plate; 3. Pin seat; 4. Fixture; 5. Positioning pin; 6. First go / no-go gauge; 7. Second go / no-go gauge; 41. Nut seat; 42. Adjusting bolt; 43. First clamping part; 44. Second clamping part; 45. Set screw; 46. Clamping bolt; 47. Limiting block; 48. Compression spring; 201. First oblong hole; 202. First inspection gap; 203. Second inspection gap; 204. Observation port; 301. Support surface; 302. Pin hole; 441. Connecting part; 4201. Annular groove; 4301. Countersunk hole; 4302. Threaded hole; 4701. Second storage hole; 44101. Second oblong hole; 44102. First storage hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0027] like Figure 1-10As shown, the present invention provides a maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing, comprising a base plate 1, and a side plate 2 and a pin seat 3 fixed to the top of the base plate 1.

[0028] There are two side plates 2, symmetrically arranged on both sides of the base plate 1, used to simulate the constraint environment of the fan casing on both sides of the axial direction. At the same time, several clamps 4 are provided on the outer side of the side plate 2. The clamping end of the clamp 4 passes through the side plate 2 and extends into its inner area, used to clamp the side edge of the sound-absorbing plate from the top and bottom, ensuring the stability of the workpiece posture during the inspection process.

[0029] There are several pin seats 3, and each pin seat 3 has a support surface 301 on its top that matches the lower surface of the muffler plate. The support surface 301 has a pin hole 302, which is used to reproduce the original support height and positioning reference of the muffler plate in the fan casing. The height of the pin seat 3 is determined according to the original curved surface contour of the muffler plate, the spacing between adjacent pin seats 3 is determined by the original mounting hole position of the muffler plate, and the number is set according to the actual structural layout of the muffler plate, so as to effectively verify whether the outer contour and curved surface curvature of the muffler plate after maintenance have been restored to the design state.

[0030] In this structure, the overall layout of the base plate 1, symmetrical side plates 2, multi-point pin seats 3 and fixtures 4 creates a dedicated inspection platform that can reproduce the actual assembly environment inside the fan casing. This enables rapid and reliable comparison of the outline and edge position of the muffler after maintenance, significantly improving inspection efficiency and consistency, and meeting the actual needs of the aviation maintenance field for high-precision and batch testing.

[0031] Furthermore, a first oblong hole 201 is provided on the side of the side plate 2. The clamp 4 includes a nut seat 41, an adjusting bolt 42, a first clamping part 43, and a second clamping part 44. The nut seat 41 is fixed to the side of the side plate 2. The adjusting bolt 42 is screwed to the nut seat 41, and its lower end is rotatably connected to the first clamping part 43. The first clamping part 43 and the second clamping part 44 horizontally pass through the first oblong hole 201, and the first clamping part 43 is slidably disposed relative to the first oblong hole 201, while the second clamping part 44 is fixedly disposed relative to the first oblong hole 201.

[0032] The first clamping part 43 and the second clamping part 44 together constitute the clamping end of the clamp 4, and the clamping action is achieved by rotating the adjusting bolt 42. Specifically, the long side of the first oblong hole 201 is parallel to the central axis of the adjusting bolt 42. Rotating the adjusting bolt 42 clockwise moves it downward, thereby pushing the first clamping part 43 downward along the first oblong hole 201, thus cooperating with the second clamping part 44 to clamp the side edge of the sound-absorbing plate. Conversely, rotating it counterclockwise moves the adjusting bolt 42 upward, and the first clamping part 43 retracts accordingly, completing the release action. Throughout the process, the first clamping part 43 slides smoothly along the first oblong hole 201, ensuring that the clamping force is applied evenly and without damaging the surface of the composite material.

[0033] To ensure smooth rotation of the adjusting bolt 42 and prevent axial dislodgement during operation, a countersunk hole 4301 is provided at the top of the first clamping part 43, and a threaded hole 4302 communicating with it is provided on the side. An annular groove 4201 is provided at the lower end of the adjusting bolt 42 and is accommodated within the countersunk hole 4301. The clamp 4 also includes a set screw 45, which is screwed into the threaded hole 4302 and extends into the annular groove 4201. Its end abuts against the side wall of the annular groove 4201, thereby axially limiting the adjusting bolt 42 while allowing it to rotate freely. This structure achieves a reliable rotary connection, effectively improving the stability and durability of the clamp 4 during long-term use.

[0034] In addition, the clamp 4 also includes a clamping bolt 46 and a limiting block 47. The limiting block 47 is fixed to the outside of the side plate 2 and located below the second clamping part 44. The bottom of the outer end of the second clamping part 44 is provided with a connecting part 441, which is fixed to the outside of the side plate 2 by the clamping bolt 46, thereby forming a stable lower clamping reference surface, ensuring that the bottom support position of the silencer plate is consistent during each test and improving the repeatability of the test.

[0035] Furthermore, the connecting part 441 is provided with a second oblong hole 44101, the long side of which is parallel to the central axis of the adjusting bolt 42. One end of the clamping bolt 46 passes through the second oblong hole 44101 and is screwed to the side plate 2, so that the second clamping part 44 has the ability to make fine adjustments up and down, which is convenient to compensate for tooling machining tolerances or adapt to structural differences in different batches of sound-absorbing plates.

[0036] In addition, the clamp 4 also includes a compression spring 48. Meanwhile, the bottom of the connecting part 441 is provided with a first storage hole 44102, and the top of the limiting block 47 is provided with a second storage hole 4701. One end of the compression spring 48 is accommodated in the first storage hole 44102, and the other end is accommodated in the second storage hole 4701.

[0037] When initially assembling the tooling or adapting it to different models of sound-absorbing plates, the clamping bolt 46 can be loosened. At this time, the elastic force of the compression spring 48 pushes the connecting part 441 and the second clamping part 44 upward simultaneously, and causes the second clamping part 44 to slide upward along the first oblong hole 201, so that the second clamping part 44 is in a high position, which is convenient for the operator to observe and adjust. After the operator presses the second clamping part 44 down to the target height, the clamping bolt 46 is tightened to lock its position, making the operation relatively convenient.

[0038] During this process, the connecting part 441 moves synchronously with the second clamping part 44, and the second oblong hole 44101 on it slides along the rod of the fastening bolt 46. When the upper or lower end face of the second oblong hole 44101 abuts against the rod of the fastening bolt 46, the limit position of the adjustment stroke is reached, thereby limiting the movement range of the second clamping part 44 and preventing over-adjustment or dislodgement.

[0039] It should be noted that during the testing process, the clamping bolt 46 remains tightened, and the second clamping part 44 is fixed relative to the first waist-shaped hole 201, serving as a stable lower clamping reference surface to ensure the consistency of the test results.

[0040] Based on the above structure, this tooling also includes a positioning pin 5. One end of the positioning pin 5 is inserted into the pin hole 302 to simulate the original mounting hole positioning method of the muffler plate in the fan casing. This can quickly verify whether the positional accuracy and geometric dimensions of the mounting hole after repair have been restored to the original design requirements, thereby improving the inspection efficiency of key assembly features.

[0041] The size of the locating pin 5 is determined by the size of the original mounting hole of the muffler plate, and is used to check whether the position and size of the mounting hole are correct after the muffler plate is repaired. When the repaired muffler plate is placed on the pin seat 3, if the locating pin 5 can pass through the mounting hole of the muffler plate and be smoothly inserted into the pin hole 302, the inspection is passed.

[0042] Based on this, the fixture also includes a first go / no-go gauge 6. During the inspection process, after the positioning pin 5 passes the inspection, the muffler plate is clamped by the fixture 4. After clamping, a first inspection gap 202 is formed between the inner wall of the side plate 2 and the side edge of the muffler plate. This gap accurately reflects the fit between the edge contour of the muffler plate and the inner wall of the fan casing. At this time, the go end or the no-go end of the first go / no-go gauge 6 can be selectively inserted into the first inspection gap 202. If the go end can pass smoothly while the no-go end cannot, the edge position is determined to be qualified. This eliminates the need for complex instruments and significantly improves on-site inspection efficiency and operability.

[0043] Based on this, the fixture also includes a second go / no-go gauge 7. During the inspection process, after the positioning pin 5 passes the inspection, the muffler plate is clamped by the fixture 4. After clamping, a second inspection gap 203 is formed between the first clamping part 43 and the second clamping part 44. This gap is equivalent to the local edge thickness of the muffler plate or the installation height of the buffer pad. The go end or the no-go end of the second go / no-go gauge 7 can be selectively inserted into this gap. If the go end can pass smoothly while the no-go end cannot, it is determined that the thickness dimension of the repair area meets the original design tolerance, which is suitable for high consistency batch sampling inspection requirements.

[0044] To facilitate operation and monitoring, several observation ports 204 are provided on the side of the side plate 2. Operators can visually confirm in real time whether the muffler plate is fully in place, whether the clamp 4 is in position, and the insertion status of the go / no-go gauge through the observation ports 204, thereby improving the safety of operation and the controllability of the testing process.

[0045] In the above structure, the first go / no-go gauge 6 and the second go / no-go gauge 7 are customized according to the tolerance requirements of the corresponding detection positions in the original design drawings of the soundproof plate. The go end dimension is equal to the minimum allowable value of the gap being measured, and the no-go end dimension is equal to the maximum allowable value.

[0046] Specifically, the first go / no-go gauge 6 is used to check the assembly clearance between the side edge of the muffler and the inner wall of the fan casing. It is generally sheet-like or stepped, with a go end and a no-go end machined in the thickness direction. The second go / no-go gauge 7 is used to check the local thickness of the edge of the muffler or the height of the buffer pad installation area. Its structure also includes a go end and a no-go end, and the height difference between the two strictly corresponds to the design tolerance zone.

[0047] In actual use, the operator places the repaired muffler plate on the support surface 301, aligns the mounting hole with the pin hole 302, and inserts the positioning pin 5 to complete the reference positioning. Then, the first clamping part 43 is driven downwards by the adjusting bolt 42, cooperating with the fixed second clamping part 44 to clamp the side edge of the muffler plate vertically. At this time, the first inspection gap 202 naturally forms between the inner wall of the side plate 2 and the side edge of the muffler plate, and the second inspection gap 203 forms between the first clamping part 43 and the second clamping part 44. The inspector only needs to try inserting the go end and the stop end of the first go / no-go gauge 6 and the second go / no-go gauge 7 into the corresponding gaps in sequence: if the go end can be inserted smoothly but the stop end cannot, the size of that part is considered acceptable; otherwise, it is out of tolerance and needs to be repaired.

[0048] This inspection method does not rely on complex equipment such as coordinate measuring machines and laser scanners. It can make high-precision and rapid judgments on the maintenance site using only the tooling body and matching go / no-go gauges, which greatly shortens the inspection cycle and ensures the consistency of results. It fully meets the stringent requirements of aviation maintenance for efficient, reliable and repeatable inspection.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing, characterized in that: Includes a base plate (1), and a side plate (2) and a pin seat (3) fixed to the top of the base plate (1), wherein, There are two side plates (2), which are symmetrically arranged on both sides of the bottom plate (1); There are several pin seats (3), and a support surface (301) is provided on the top of each seat. A pin hole (302) is provided on the support surface (301). The outer side of the side plate (2) is provided with several clamps (4), the clamping ends of the clamps (4) pass through the side plate (2) and extend to its inner area, for clamping the side edge of the sound-absorbing plate from the top and bottom.

2. The maintenance and inspection fixture for the silencer plate of an aircraft engine fan casing as described in claim 1, characterized in that: The side plate (2) has a first waist-shaped hole (201) on its side. The clamp (4) includes a nut seat (41), an adjusting bolt (42), a first clamping part (43), and a second clamping part (44). The nut seat (41) is fixed to the side of the side plate (2); The adjusting bolt (42) is screwed to the nut seat (41), and its lower end is rotatably connected to the first clamping part (43). The first clamping part (43) and the second clamping part (44) pass horizontally through the first waist-shaped hole (201), and the first clamping part (43) is slidably disposed relative to the first waist-shaped hole (201), while the second clamping part (44) is fixedly disposed relative to the first waist-shaped hole (201).

3. The maintenance and inspection fixture for the silencer plate of an aircraft engine fan casing as described in claim 2, characterized in that: The first clamping part (43) has a countersunk hole (4301) at the top and a threaded hole (4302) on the side. The lower end of the adjusting bolt (42) has an annular groove (4201). The lower end of the adjusting bolt (42) is accommodated in the countersunk hole (4301), and the countersunk hole (4301) is connected to the threaded hole (4302); The clamp (4) also includes a set screw (45), which is screwed into the threaded hole (4302) and extends into the annular groove (4201).

4. The maintenance and inspection fixture for the silencer plate of an aircraft engine fan casing as described in claim 3, characterized in that: The clamp (4) further includes a clamping bolt (46) and a limiting block (47), wherein, The limiting block (47) is fixed to the outside of the side plate (2) and located below the second clamping part (44); The bottom of the outer end of the second clamping part (44) is provided with a connecting part (441), and the connecting part (441) is fixed to the outside of the side plate (2) by the clamping bolt (46).

5. The maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing as described in claim 4, characterized in that: The connecting part (441) is provided with a second oblong hole (44101), wherein, One end of the clamping bolt (46) passes through the second waist-shaped hole (44101) and is screwed to the side plate (2).

6. The maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing as described in claim 5, characterized in that: The clamp (4) further includes a compression spring (48), wherein, The bottom of the connecting part (441) is provided with a first storage hole (44102), and the top of the limiting block (47) is provided with a second storage hole (4701). One end of the compression spring (48) is housed in the first receiving hole (44102), and the other end is housed in the second receiving hole (4701).

7. A maintenance and inspection fixture for a silencer plate of an aircraft engine fan casing as described in any one of claims 1 to 6, characterized in that: It also includes a locating pin (5), in which, One end of the positioning pin (5) is inserted into the pin hole (302).

8. The maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing as described in claim 1, characterized in that: It also includes the first go / no-go gauge (6), in which, When the clamp (4) holds the sound-absorbing plate, a first detection gap (202) is formed between the inner wall of the side plate (2) and the side edge of the sound-absorbing plate. The go end or the no-go end of the first go / no-go gauge (6) is selectively inserted into the first detection gap (202).

9. The maintenance and inspection fixture for a noise reduction plate of an aircraft engine fan casing as described in claim 2, characterized in that: It also includes the second no-go gauge (7), in which, When the clamp (4) holds the sound-absorbing plate, a second detection gap (203) is formed between the first clamping part (43) and the second clamping part (44). The go end or the no-go end of the second go / no-go gauge (7) is selectively inserted into the second detection gap (203).

10. The maintenance and inspection fixture for a silencer plate of an aircraft engine fan casing as described in claim 1, characterized in that: The side plate (2) has several observation ports (204) on its side.

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