A clamping device for aviation hydraulic pipeline vibration test

Abstract

The utility model provides a kind of clamping device for aviation hydraulic pipeline vibration test, belong to pipeline vibration test technical field, technical scheme is, a kind of clamping device for aviation hydraulic pipeline vibration test, including locating seat, the top of locating seat is provided with connecting sleeve, the top of connecting sleeve is provided with clamping mechanism, clamping mechanism can be clamped and fixed the hydraulic pipeline of waiting test, the bottom of connecting sleeve is provided with empty slot, the bottom of empty slot is fixed with connecting gear disc, the axis of connecting gear disc coincides with the axis of connecting sleeve, driving gear disc is arranged in empty slot, driving gear disc and connecting gear disc are mutually engaged, driving gear disc is fixedly connected with the output shaft of servo motor, the shell of servo motor is fixed on locating seat.The utility model has the beneficial effect that the bending angle of the hydraulic pipeline can be accurately set, and the test data deviation is not large, which can meet the strict requirements of high-precision test data in the field of aviation research and production.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline vibration testing technology, specifically relating to a clamping device for vibration testing of aviation hydraulic pipelines. Background Technology

[0002] With the trend towards high-speed and high-pressure development of aviation hydraulic systems, the vibration characteristics of their hydraulic pipelines are becoming increasingly complex, posing a key challenge to stable aircraft flight. Aviation hydraulic pipelines are affected by multiple factors, including oil pulsation, pressure, and structural parameters, and their vibration characteristics directly impact the stability and reliability of the entire system. Therefore, vibration, as a core parameter for system status monitoring, makes vibration monitoring of the tested hydraulic pipelines a necessary measure to ensure system safety. In this process, the clamping device, as a key component for fixing the hydraulic pipelines, has a significant impact on the test results.

[0003] Currently, existing clamping devices for vibration testing of aviation hydraulic lines mainly consist of a base, a lifting platform, and pipe clamps. The base serves as the supporting foundation for the entire device, providing a stable mounting platform for other components. The lifting platform is mounted on the base and uses a motor-driven screw-nut pair or hydraulic telescopic rod transmission mechanism to achieve vertical lifting and lowering adjustment to meet testing requirements at different heights. The pipe clamps are mounted on the lifting platform, typically using bolt connections. Tightening the bolts clamps the hydraulic lines. When fixing the hydraulic lines, the operator places the hydraulic lines in the middle of the pipe clamps, adjusts the position, and then tightens the bolts to secure the hydraulic lines, thus completing the fixing operation.

[0004] However, in practical applications, hydraulic lines exhibit varying degrees of bending due to differences in installation space and system layout, and their lengths also differ. Existing clamping devices can only perform simple fixing and height adjustment, failing to precisely set the bending angle of the hydraulic lines. This makes it impossible to accurately reproduce the working environment of the hydraulic lines when simulating their actual service conditions, resulting in significant deviations between vibration test data and actual conditions. Ultimately, this leads to poor vibration test results for hydraulic lines, making it difficult to meet the high-precision test data requirements of aerospace research and production.

[0005] Studies have shown that changes in the bending angle of pipelines have a significant impact on vibration response. Dou Jinxin et al. (Propulsion Technology, 2022) analyzed the influence of crack angle on vibration response by establishing a model of a straight aero-hydraulic pipe with a diagonal crack. The results showed that as the crack angle increases, the vibration response amplitude of the pipeline increases significantly, and the vibration response amplitude of the pipeline with a transverse crack (90°) is much greater than that of the pipeline with a diagonal crack.

[0006] Existing clamping devices can only perform simple fixing and height adjustment, and cannot accurately set the bending angle of hydraulic lines. As pointed out in patent document CN111156224A, existing devices cannot detect vibration signals of pipelines with multiple spatial bending angles, and cannot realistically simulate the actual working environment of aviation hydraulic line bends. This makes it impossible to accurately reproduce the working environment of hydraulic lines when simulating their actual service conditions, resulting in a large deviation between vibration test data and actual conditions. Ultimately, this leads to poor vibration test results for hydraulic lines, making it difficult to meet the requirements of aviation research and production for high-precision test data. Utility Model Content

[0007] This invention addresses the problem that existing clamping devices cannot accurately set the bending angle of hydraulic lines, leading to large deviations in test data. It provides a clamping device for vibration testing of aviation hydraulic lines that can accurately set the bending angle of hydraulic lines and avoids large deviations in test data.

[0008] To solve the above problems, the technical solution adopted by this utility model is a clamping device for vibration testing of aviation hydraulic pipelines, including a positioning seat, a connecting sleeve provided above the positioning seat, a clamping mechanism provided at the top of the connecting sleeve, the clamping mechanism can clamp and fix the hydraulic pipeline to be tested, a slot provided at the bottom of the connecting sleeve, a connecting gear plate fixed at the bottom of the slot, the axis of the connecting gear plate coincides with the axis of the connecting sleeve, a driving gear plate is provided in the slot, the driving gear plate meshes with the connecting gear plate, the driving gear plate is fixedly connected to the output shaft of a servo motor, and the housing of the servo motor is fixed on the positioning seat.

[0009] In this technical solution, the clamping mechanism can hold the hydraulic pipeline to be tested. The servo motor on the positioning seat can control the rotation of the drive gear, causing the connecting gear to rotate synchronously. The connecting gear is fixed to the connecting sleeve, so the connecting sleeve rotates with the connecting gear, thereby driving the clamping mechanism to rotate. This linkage structure allows for precise control of the bending angle of the hydraulic pipeline, highly replicating the actual working environment of the hydraulic pipeline, significantly reducing the deviation between vibration test data and actual conditions, and significantly improving the effectiveness of hydraulic pipeline vibration testing, effectively meeting the stringent requirements of aerospace research and production for high-precision test data.

[0010] Furthermore, the cross-section of the slot is circular, and the connecting gear is an internal gear, with its outer wall fixedly connected to the side wall of the slot. The internal gear design of the connecting gear facilitates precise meshing and transmission with the drive gear, ensuring the accuracy and stability of power transmission, reducing errors and vibrations during transmission, and thus allowing for more precise control of the connecting gear's rotation. This, in turn, enables precise position control of the connecting sleeve associated with the connecting gear.

[0011] Furthermore, a positioning frustum is fixed to the top of the positioning seat, located within the empty slot. The dimensions of the positioning frustum are adapted to the empty slot, and the outer wall of the positioning frustum and the side wall of the empty slot are in clearance fit. The matching dimensions and clearance fit between the positioning frustum and the empty slot define a precise rotation range for the connecting sleeve, serving as a precise limiting mechanism. The rotation of the connecting sleeve is strictly limited within the design range, preventing deviations in test results due to sleeve offset during rotation, ensuring safe operation of the device, and improving the reliability and repeatability of the test.

[0012] Furthermore, the clamping mechanism includes a clamping seat, which is fixedly connected to the connecting sleeve. A lifting assembly is mounted on the clamping seat, and a clamping plate is connected to the lifting assembly. The clamping plate is located above the clamping seat, and the lifting assembly can control the height of the clamping plate. The lifting assembly can precisely control the height of the clamping plate, allowing it to apply appropriate pressure according to the specific conditions of the hydraulic pipeline, ensuring that the hydraulic pipeline is stably and reliably clamped between the clamping seat and the clamping plate. During the test, this prevents displacement or shaking of the hydraulic pipeline, ensuring the accuracy and stability of the test data, and also avoiding potential safety hazards caused by insecure clamping.

[0013] Furthermore, a first groove is provided on the top of the clamping seat, and a second groove is provided on the bottom of the clamping plate. Both the first and second grooves are semi-circular, positioned opposite each other, and have the same diameter. Hydraulic lines are typically circular, and the semi-circular first and second grooves can fit well with the shape of the hydraulic lines, increasing the contact area and distributing the clamping force evenly across the lines. This avoids localized stress concentration that could damage the hydraulic lines and ensures that the lines do not roll or shift under clamping conditions, improving clamping stability and reliability.

[0014] Furthermore, a limiting groove is provided at the top of the clamping seat, and a limiting plate is provided at the bottom of the clamping plate. The limiting plate is inserted into the limiting groove and can slide vertically along the limiting groove. The cooperation between the limiting plate and the limiting groove provides precise guidance for the lifting and lowering of the clamping plate, ensuring that the clamping plate can only slide vertically along the direction of the limiting groove. This prevents the clamping plate from shaking, deviating, or rotating during the lifting and lowering process, thereby ensuring that the clamping plate can accurately cooperate with the clamping seat to stably clamp the hydraulic pipeline.

[0015] Furthermore, a vertically oriented connecting hole is provided within the connecting sleeve. The lifting assembly includes an adjusting screw located within the connecting hole. The top end of the adjusting screw passes through a clamping seat and is fixedly connected to a clamping plate. A lifting gear is sleeved around the adjusting screw, and the outer wall of the adjusting screw is threadedly connected to the inner wall of the lifting gear. A linkage gear meshes with the outer side of the lifting gear, and an adjusting gear disc, which is an internal gear disc, meshes with the outer side of the linkage gear. This gear transmission method effectively transmits power, reduces energy loss, and improves transmission efficiency. The meshing of the internal gear disc with the linkage gear and the lifting gear makes the transmission process smoother, enabling rapid response to adjustment actions, improving operational convenience and the overall performance of the device.

[0016] Furthermore, the top of the connecting sleeve is provided with an annular groove, which is horizontally positioned and its centerline coincides with the axis of the adjusting gear. An adjusting block is fixed to the bottom of the adjusting gear, engaging within the annular groove and capable of sliding along it. The annular groove provides precise positioning and guidance for the adjusting gear. Because the centerline of the annular groove coincides with the axis of the adjusting gear, and the adjusting block engages within the groove, the adjusting gear maintains a stable position during rotation, preventing radial offset or wobbling. This ensures the meshing accuracy between the adjusting gear and the linkage gear, thereby guaranteeing the stability and reliability of the entire transmission system.

[0017] Furthermore, a support plate is provided below the positioning seat, and a first sliding groove is provided on the top of the support plate. A first slider is fixed to the bottom of the positioning seat, and the first slider is engaged in the first sliding groove and can slide along the first sliding groove. By sliding the first slider in the first sliding groove, the positioning seat can be moved on the support plate as needed, making it convenient to adjust the position of the positioning seat to adapt to the positioning requirements of hydraulic pipelines of different sizes and positions.

[0018] Furthermore, a base is provided below the support plate, and a second sliding groove is provided on the top of the base. The second sliding groove is perpendicular to the first sliding groove. A second slider is fixed to the bottom of the support plate, and the second slider is engaged in the second sliding groove and can slide along the second sliding groove. The first and second sliding grooves are perpendicular to each other, allowing the positioning seat to slide in one direction on the support plate, while the support plate can slide in another perpendicular direction on the base, thus realizing flexible adjustment of the positioning seat in a two-dimensional plane. This is very advantageous for complex hydraulic pipeline layouts, enabling more precise positioning of the clamping mechanism to the target position, adapting to hydraulic pipelines with different orientations and positions, and greatly improving the versatility and adaptability of the device.

[0019] As can be seen from the above technical solution, the advantages of this utility model are as follows: In this technical solution, the positioning seat can be flexibly adjusted in a two-dimensional plane, and with the help of the clamping mechanism installed on it, the hydraulic pipeline to be tested can be firmly clamped. The servo motor on the positioning seat can precisely control the rotation of the drive gear plate, and by utilizing the linkage effect between the gears, it drives the connecting gear plate to rotate synchronously, thereby driving the clamping mechanism to rotate flexibly. With such a mechanical structure, not only can the bending angle of the hydraulic pipeline be precisely controlled, but the state of the hydraulic pipeline in actual working conditions can also be highly simulated, effectively reducing the deviation between vibration test data and the actual situation, and significantly improving the accuracy and reliability of the test. Therefore, this solution can accurately set the bending angle of the hydraulic pipeline without causing large deviations in the test data, and can effectively meet the strict requirements of high-precision test data in the aerospace research and production fields, providing strong support for the research and development and production of aerospace technology. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0021] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the bearing plate in a specific embodiment of this utility model. Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the structure of the bearing plate in a specific embodiment of this utility model. Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the lifting assembly in a specific embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the positioning seat in a specific embodiment of the present utility model;

[0026] Figure 6 This is a cross-sectional view of the connecting sleeve in a specific embodiment of this utility model;

[0027] Figure 7 This is a schematic diagram of the internal structure of the hollow groove in a specific embodiment of this utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the adjusting gear disc in a specific embodiment of this utility model.

[0029] In the diagram: 1-Base, 11-Second slide groove, 12-Guide groove, 2-Bearing plate, 21-First slide groove, 22-Second slider, 23-Guide block, 3-Positioning seat, 31-First slider, 32-Positioning frustum, 33-Servo motor, 34-Drive gear, 4-Connecting sleeve, 41-Empty groove, 42-Connecting gear, 43-Connecting hole, 44-Annular groove, 5-Clamping mechanism, 51-Clamping plate, 511-Second groove, 512-Limiting plate, 52-Clamping seat, 521-First groove, 522-Limiting groove, 6-Lifting assembly, 61-Adjusting gear, 611-Adjusting block, 62-Linkage gear, 63-Lifting gear, 64-Adjusting screw. Detailed Implementation

[0030] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0031] A clamping device for vibration testing of aviation hydraulic lines, such as Figure 1 As shown, the device includes a base 1, a support plate 2, a positioning seat 3, a connecting sleeve 4, and a clamping mechanism 5. The base 1 serves as the supporting foundation for the entire device. The support plate 2 is mounted on the base 1 and can slide along the length of the base 1. The positioning seat 3 is mounted on top of the support plate 2 and can also slide along the length of the support plate 2. A rotatable connecting sleeve 4 is mounted above the positioning seat 3, and the clamping mechanism 5 is mounted on top of the connecting sleeve 4 for clamping and fixing the hydraulic pipeline to be tested.

[0032] The base 1 is designed as a rectangular structure. Two T-shaped second sliding grooves 11 are provided on the top of the base 1. The length direction of these two second sliding grooves 11 is consistent with the length direction of the base 1, and they are symmetrically distributed along the longitudinal center plane of the base 1. Between the two second sliding grooves 11, a guide groove 12 with a rectangular cross-section is provided, and the length direction of the guide groove 12 is also the same as the length direction of the base 1. A lead screw is installed in the guide groove 12. One end of the lead screw is rotatably connected to the base 1 via a bearing seat, and the other end passes through the guide groove 12, with a knob welded to the protruding part. The operator can control the rotation of the lead screw by rotating the knob.

[0033] like Figure 2 , 3As shown, the support plate 2 is also designed in a rectangular shape, with its length direction perpendicular to the length direction of the base 1. At the bottom of the support plate 2, two T-shaped second sliders 22 are welded. The distance between these two second sliders 22 is equal to the distance between the two second sliding grooves 11 at the top of the base 1, allowing the two second sliders 22 to engage in their respective second sliding grooves 11 and slide along them. Between the two second sliders 22, a guide block 23 is installed. The shape of the guide block 23 matches the guide groove 12, and the guide block 23 engages within the guide groove 12. Its top is welded to the bottom of the support plate 2. The guide block 23 has a through-hole threaded hole that matches the lead screw in the guide groove 12. When the lead screw is rotated, it interacts with the threaded hole on the guide block 23, causing the guide block 23 to drive the support plate 2 to slide along the guide groove 12. The top of the support plate 2 is provided with two T-shaped first sliding grooves 21. The length direction of the first sliding grooves 21 is perpendicular to the length direction of the second sliding grooves 11, and the two first sliding grooves 21 are symmetrically distributed along the longitudinal center plane of the support plate 2. On the outer side of the first sliding grooves 21, along the length direction of the support plate 2, a number of bolt holes are evenly distributed.

[0034] The positioning seat 3 is generally square. At the bottom of the positioning seat 3, two T-shaped first sliders 31 are welded. The distance between the two first sliders 31 is the same as the distance between the two first sliding grooves 21 on the top of the support plate 2. This allows the two first sliders 31 to engage with their respective first sliding grooves 21 and slide along them. A positioning frustum 32 is fixed to the top of the positioning seat 3, and the positioning frustum 32 and the positioning seat 3 are manufactured as a single piece. Through-holes are provided at the four corners of the positioning seat 3. The positions of these through-holes correspond to the bolt holes on the support plate 2. By installing bolts in the through-holes and bolt holes, the positioning seat 3 can be further fixed to the support plate 2.

[0035] like Figure 4-6 As shown, the connecting sleeve 4 is a cylindrical structure with a cylindrical groove 41 at its bottom. The groove 41 has a circular cross-section. The bottom of the connecting sleeve 4 is fitted onto the positioning frustum 32 on the top of the positioning seat 3. The size of the positioning frustum 32 is adapted to the groove 41. The outer wall of the positioning frustum 32 is connected to the side wall of the groove 41 by a clearance fit, allowing the connecting sleeve 4 to rotate around the positioning frustum 32. Inside the groove 41, a connecting gear disc 42 is installed. The connecting gear disc 42 has an internal gear structure, and its axis coincides with the axis of the connecting sleeve 4. The outer wall of the connecting gear disc 42 is fixed to the side wall of the groove 41 by welding, and the bottom of the connecting gear disc 42 is also welded to the bottom of the groove 41. Figure 7As shown, a drive gear 34 is also installed inside the slot 41. The drive gear 34 is located inside the connecting gear 42, and the drive gear 34 meshes with the connecting gear 42. The drive gear 34 is fixedly connected to the output shaft of the servo motor 33, and the axis of the output shaft of the servo motor 33 coincides with the axis of the drive gear 34. The housing of the servo motor 33 is fixed to the positioning frustum 32 by bolts. A vertical connecting hole 43 is provided at the top of the connecting sleeve 4, and the center line of the connecting hole 43 coincides with the axis of the connecting sleeve 4. Figure 8 As shown, in addition, the top of the connecting sleeve 4 is provided with a horizontal annular groove 44. The cross-section of the annular groove 44 is T-shaped, and its center line coincides with the axis of the adjusting gear plate 61.

[0036] The clamping mechanism 5 consists of a clamping seat 52 and a clamping plate 51. The clamping seat 52 is located above the connecting sleeve 4, and an open annular support seat is fixed to the clamping seat 52 and the connecting sleeve 4 by welding. A lifting assembly 6 is provided on the clamping seat 52, which is connected to the clamping plate 51, so that the clamping plate 51 is located above the clamping seat 52. The height of the clamping plate 51 can be controlled by the lifting assembly 6. A first groove 521 is provided at the top of the clamping seat 52, and a second groove 511 is provided at the bottom of the clamping plate 51. Both the first groove 521 and the second groove 511 are semi-circular, and they are opposite each other and have the same diameter. In this embodiment, four first grooves 521 and four second grooves 511 are provided. The two first grooves 521 and the two second grooves 511 located near the middle of the connecting sleeve 4 have the same diameter as the second grooves 511, and the two first grooves 521 and the two second grooves 511 located away from the middle of the connecting sleeve 4 also have the same diameter as the second grooves 511. Two limiting grooves 522 are provided at the top of the clamping seat 52, and these two limiting grooves 522 are distributed on both sides of the clamping seat 52. Two limiting plates 512 are provided at the bottom of the clamping plate 51, and the positions of the two limiting plates 512 correspond to the two limiting grooves 522 respectively. The limiting plates 512 are inserted into the limiting grooves 522, and the limiting plates 512 can slide vertically along the limiting grooves 522.

[0037] The lifting assembly 6 includes an adjusting screw 64, which is located in the connecting hole 43 at the top of the connecting sleeve 4. The top end of the adjusting screw 64 passes through the clamping seat 52 and is welded to the clamping plate 51. A horizontally placed lifting gear 63 is sleeved on the outside of the adjusting screw 64, located within a support base. The lifting gear 63 has a threaded hole at its center, which is adapted to the adjusting screw 64; that is, the outer wall of the adjusting screw 64 and the inner wall of the lifting gear 63 are threaded together. A linkage gear 62 is installed at the opening of the support base, meshing with the lifting gear 63, and the shaft of the linkage gear 62 is fixedly connected to the top of the connecting sleeve 4. An adjusting gear disc 61 with an internal gear structure meshes with the outside of the linkage gear 62. A T-shaped adjusting block 611 is welded to the bottom of the adjusting gear plate 61. The shape of the adjusting block 611 is adapted to the annular groove 44 at the top of the connecting sleeve 4. The adjusting block 611 is engaged in the annular groove 44 and can slide along the annular groove 44.

[0038] The specific usage process of this utility model is as follows: First, the operator adjusts the position of the positioning seat 3 through the first slide groove 21 and the second slide groove 11. After the position of the positioning seat 3 is adjusted, the hydraulic pipeline is installed in the first groove 521 on the top of the clamping seat 52. Next, the adjusting gear 61 is rotated. The adjusting gear 61 meshes with the linkage gear 62, driving the linkage gear 62 to rotate. The linkage gear 62 then meshes with the lifting gear 63, driving the lifting gear 63 to rotate. When the lifting gear 63 rotates, due to its threaded connection with the adjusting screw 64, it drives the adjusting screw 64 to rotate, thereby causing the adjusting screw 64 to begin to descend. During the descent of the adjusting screw 64, it drives the clamping plate 51 to descend, so that the first groove 521 and the second groove 511 cooperate with each other to clamp and fix the hydraulic pipeline. After the hydraulic pipeline is clamped and fixed, the rotation of the drive gear 34 is controlled by the servo motor 33. The drive gear 34 meshes with the connecting gear 42, causing the connecting gear 42 to rotate synchronously. Because the connecting sleeve 4 is fixedly connected to the connecting gear disc 42, it rotates together with the connecting gear disc 42, thereby causing the clamped hydraulic pipeline to rotate. With the help of this linkage structure, the bending angle of the hydraulic pipeline can be precisely controlled, highly replicating the actual working environment of the hydraulic pipeline.

[0039] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: the positioning seat can be flexibly adjusted in a two-dimensional plane, and with the help of the clamping mechanism installed on it, the hydraulic pipeline to be tested can be firmly clamped. The servo motor on the positioning seat can precisely control the rotation of the drive gear plate, and by utilizing the linkage effect between the gears, it drives the connecting gear plate to rotate synchronously, thereby driving the clamping mechanism to rotate flexibly. With such a mechanical structure, not only can the bending angle of the hydraulic pipeline be precisely controlled, but the state of the hydraulic pipeline in actual working conditions can also be highly simulated, effectively reducing the deviation between vibration test data and the actual situation, and significantly improving the accuracy and reliability of the test. Therefore, this solution can accurately set the bending angle of the hydraulic pipeline without causing large deviations in the test data, and can effectively meet the strict requirements of high-precision test data in the aerospace research and production fields, providing strong support for the research and development and production of aerospace technology.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping device for vibration testing of aviation hydraulic pipelines, comprising a positioning seat (3), characterized in that, A connecting sleeve (4) is provided above the positioning seat (3). A clamping mechanism (5) is provided at the top of the connecting sleeve (4). The clamping mechanism (5) can clamp and fix the hydraulic pipeline to be tested. A slot (41) is provided at the bottom of the connecting sleeve (4). A connecting gear (42) is fixed at the bottom of the slot (41). The axis of the connecting gear (42) coincides with the axis of the connecting sleeve (4). A driving gear (34) is provided in the slot (41). The driving gear (34) meshes with the connecting gear (42). The driving gear (34) is fixedly connected to the output shaft of the servo motor (33). The housing of the servo motor (33) is fixed on the positioning seat (3).

2. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 1, characterized in that, The cross-section of the empty groove (41) is circular, the connecting toothed disc (42) is an inner toothed disc, and the outer wall of the connecting toothed disc (42) is fixedly connected to the side wall of the empty groove (41).

3. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 2, characterized in that, The top of the positioning seat (3) is fixed with a positioning frustum (32), which is located in the empty groove (41). The size of the positioning frustum (32) is adapted to the empty groove (41), and the outer wall of the positioning frustum (32) and the side wall of the empty groove (41) are in clearance fit.

4. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 1, characterized in that, The clamping mechanism (5) includes a clamping seat (52), which is fixedly connected to the connecting sleeve (4). A lifting assembly (6) is provided on the clamping seat (52), and a clamping plate (51) is connected to the lifting assembly (6). The clamping plate (51) is located above the clamping seat (52), and the lifting assembly (6) can control the height of the clamping plate (51).

5. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 4, characterized in that, The clamping seat (52) has a first groove (521) on its top and a second groove (511) on its bottom. Both the first groove (521) and the second groove (511) are semi-circular. The first groove (521) and the second groove (511) are opposite each other and have the same diameter.

6. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 4, characterized in that, The clamping seat (52) has a limit groove (522) at the top and a limit plate (512) at the bottom of the clamping plate (51). The limit plate (512) is inserted into the limit groove (522) and can slide vertically along the limit groove (522).

7. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 4, characterized in that, The connecting sleeve (4) is provided with a connecting hole (43), which is vertically set. The lifting assembly (6) includes an adjusting screw (64), which is located in the connecting hole (43). The top end of the adjusting screw (64) passes through the clamping seat (52) and is fixedly connected to the clamping plate (51). The adjusting screw (64) is sleeved with a lifting gear (63). The outer wall of the adjusting screw (64) is threaded to the inner wall of the lifting gear (63). The lifting gear (63) is meshed with a linkage gear (62) on the outside. The linkage gear (62) is meshed with an adjusting gear disc (61) on the outside. The adjusting gear disc (61) is an internal gear disc.

8. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 7, characterized in that, The top of the connecting sleeve (4) is provided with an annular groove (44), which is horizontal and the center line of the annular groove (44) coincides with the axis of the adjusting gear (61). An adjusting block (611) is fixed at the bottom of the adjusting gear (61). The adjusting block (611) is engaged in the annular groove (44) and can slide along the annular groove (44).

9. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 1, characterized in that, A support plate (2) is provided below the positioning seat (3), a first slide groove (21) is provided on the top of the support plate (2), and a first slider (31) is fixed at the bottom of the positioning seat (3). The first slider (31) is engaged in the first slide groove (21) and can slide along the first slide groove (21).

10. The clamping device for vibration testing of aviation hydraulic pipelines according to claim 9, characterized in that, A base (1) is provided below the support plate (2), and a second slide groove (11) is provided on the top of the base (1). The second slide groove (11) is perpendicular to the first slide groove (21). A second slider (22) is fixed at the bottom of the support plate (2). The second slider (22) is engaged in the second slide groove (11) and can slide along the second slide groove (11).

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