Multi-degree-of-freedom adjustment blade vibration characteristic measurement support

Abstract

The utility model relates to the technical field of engine safety, in particular to a multi-degree-of-freedom adjusting blade vibration characteristic measuring support which comprises a guide shaft assembly, a cantilever assembly and a cantilever position fixing assembly. The guide shaft assembly comprises a guide shaft, a guide shaft mounting seat, a base, a displacement table mounting seat, a displacement table connecting plate and a displacement table, and the cantilever assembly comprises a cantilever fixing seat, a cantilever, a connecting arm, a T-shaped cantilever, a laser displacement sensor, a thrust bearing, a sensor mounting frame, a linear guide rail, a limiting block, an angle limiting short rod and an angle limiting long rod. The cantilever position fixing assembly comprises a front fixing seat, a long bolt and a rear fixing seat, two adjusting modes of large-range coarse adjustment and small-range fine adjustment of the detection height of the measuring support can be achieved, the radial distance and the azimuth angle of the measuring support can be adjusted through the cantilever assembly and the linear guide rail, and multi-degree-of-freedom adjustment of the support is achieved.

Description

Technical Field

[0001] This utility model relates to the field of engine safety technology, and in particular to a multi-degree-of-freedom adjustable blade vibration characteristic measurement bracket. Background Technology

[0002] Blades are one of the main components of aero-engines, and their reliability directly affects engine performance. The vibration characteristics of blades determine their reliability and lifespan. The vibration amplitude reflects the intensity and stability of the vibration. Currently, most methods for measuring blade vibration amplitude use non-contact measurement, specifically laser displacement sensors, with less attention paid to the measurement brackets used to mount the sensors. Existing measurement brackets have unresolved problems and unmet needs. Before measurement, the sensor's measurement height needs to be adjusted, but this adjustment is inconvenient and difficult to fine-tune. During measurement, the measurement bracket is unstable, causing sensor wobbling and affecting the accuracy of the results. Aero-engine blades operate in complex environments, requiring vibration tables of varying tonnages for vibration characteristic measurements. However, vibration tables of different tonnages have different table sizes and other parameters, and existing measurement brackets lack versatility and cannot meet the measurement requirements of different vibration tables. Different blade models require different measurement positions, and even the same blade may be measured at different locations. With a constant measurement height, adjusting the position of the laser beam requires adjusting the sensor's position to achieve the desired detection location, a requirement that existing measurement brackets cannot adequately meet. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a multi-degree-of-freedom adjustable blade vibration characteristic measurement bracket that is simple in structure, easy to use, applicable to vibration tables of different tonnages and different types of blades, has adjustable measurement distance, and improves measurement accuracy.

[0004] The technical solution of this utility model is as follows: a multi-degree-of-freedom adjustable blade vibration characteristic measurement bracket. Utilizing a cylindrical coordinate system, the bracket achieves multi-degree-of-freedom adjustment by changing three parameters: height, azimuth angle, and radial distance. The azimuth angle and radial distance are adjusted using a four-bar linkage and a linear guide rail. The bracket structure includes: a guide shaft assembly, a cantilever assembly, and a cantilever position fixing assembly. The guide shaft assembly includes a guide shaft, a guide shaft mounting base, a base, a displacement stage mounting base, a displacement stage connecting plate, and a displacement stage. The cantilever assembly includes a cantilever fixing base, a cantilever, a connecting arm, a T-shaped cantilever, a laser displacement sensor, a thrust bearing, a sensor mounting bracket, a linear guide rail, a limit block, an angle limit short rod, and an angle limit long rod. The cantilever position fixing assembly includes a front fixing base, a long bolt, and a rear fixing base. The guide shaft passes through the guide shaft mounting seat and is inserted into the top plate of the base. The displacement stage mounting seat is also fitted onto the guide shaft. The displacement stage mounting seat is open-type, which facilitates the adjustment of the height and direction of the displacement stage. The detection distance can be adjusted over a wide range through the displacement stage mounting seat and finely adjusted through the displacement stage. All components in the cantilever assembly are connected by bolts and thrust bearings. The cantilever position fixing assembly is installed on the cantilever. The long bolt is connected to the front fixing seat by threads to limit the distance between the two cantilever arms and fix the rotation of the cantilever assembly. Angle limit rods are provided on both the connecting arm and the cantilever fixing seat to prevent collisions and dead points. A linear guide rail is installed on the T-shaped cantilever to further increase the radial distance adjustment range. At the same time, a threaded hole is provided at the bottom of the T-shaped cantilever to connect to the limit block, which limits the extreme position of the linear guide rail. The sensor mounting bracket is fixed by T-bolts on the side of the T-shaped cantilever.

[0005] The upper rectangular plate of the base has threaded holes and is fixedly connected to the guide shaft mounting seat by bolts. A round hole is provided in the middle of the upper rectangular plate to facilitate the insertion of the guide shaft. The lower rectangular plates of the base are all provided with through holes and are fixedly connected to the vibration table by bolts.

[0006] The upper surface of the cantilever is provided with a T-groove, and the upper and lower surfaces of the cantilever are provided with thrust bearings.

[0007] The displacement stage connecting plate is a cross-shaped plate.

[0008] The cantilever mounting base is an L-shaped plate.

[0009] The upper surface of the T-shaped cantilever is provided with a linear guide rail mounting groove, and the side is provided with a T-shaped groove.

[0010] For the cantilever assembly, aluminum was chosen as the material due to weight considerations.

[0011] The beneficial effects of this utility model are as follows: This utility model enables two adjustment methods for the measuring bracket's detection height: a large-range coarse adjustment and a small-range fine adjustment. The radial distance and azimuth angle of the measuring bracket can be adjusted via the cantilever assembly and linear guide rail, achieving multi-degree-of-freedom adjustment of the bracket. It is suitable for measuring different vibration tables and different types of blades, improving the versatility of the measuring bracket. The use of thrust bearings reduces friction during cantilever rotation, increasing the bracket's service life and the smoothness of the adjustment process. Utilizing the working principle of a cylindrical coordinate system saves installation and usage space. In summary, this utility model has a simple structure, is easy to use, and improves the versatility of the measuring bracket and the stability and accuracy of measurements during testing. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the guide shaft assembly of this utility model;

[0015] Figure 3 This is a schematic diagram of the cantilever assembly of this utility model;

[0016] Figure 4 This is a schematic diagram of the cantilever position fixing component of this utility model;

[0017] Figure 5 This is a schematic diagram of the displacement stage connecting plate structure of this utility model;

[0018] Figure 6 This is a schematic diagram of the base structure of this utility model;

[0019] Figure 7 This is a schematic diagram of the thrust bearing of this utility model in use;

[0020] Figure 8 This is a schematic diagram of the cantilever structure of this utility model;

[0021] Figure 9 This is a schematic diagram of the T-shaped cantilever structure of this utility model.

[0022] In the diagram: 1. Guide shaft assembly; 2. Cantilever assembly; 3. Cantilever position fixing assembly; 101. Guide shaft; 102. Guide shaft base; 103. Base; 104. Displacement stage mounting seat; 105. Displacement stage connecting plate; 106. Displacement stage; 201. Cantilever fixing seat; 202. Cantilever; 203. Connecting arm; 204. T-shaped cantilever; 205. Laser displacement sensor; 206. Thrust bearing; 207. Sensor mounting bracket; 208. Linear guide rail; 209. Limiting block; 210. Angle limiting short rod; 211. Angle limiting long rod; 301. Front fixing seat; 302. Long bolt; 303. Rear fixing seat. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments. For some known technologies, those skilled in the art can also use other alternative methods to implement the invention. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0024] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0025] This invention provides a multi-degree-of-freedom adjustable blade vibration characteristic measurement bracket. The required tonnage of the vibration table varies depending on the blade model and working environment. Different tonnage vibration tables have different worktable diameters and varying distances between the worktable and the mounting surface. In this embodiment, a 2-ton and a 3-ton vibration table are selected. The 2-ton vibration table has a worktable diameter of 500mm, while the 3-ton vibration table has a worktable diameter of 750mm. The multi-degree-of-freedom adjustable blade vibration characteristic measurement bracket is installed on the vibration table mounting surface. After installing the test piece, the measurement bracket is adjusted to find the optimal testing position.

[0026] like Figure 1-3As shown, the system includes a guide shaft assembly 1, a cantilever assembly 2, and a cantilever position fixing assembly 3. The guide shaft assembly 1 and cantilever assembly 2 are connected by screws via a cantilever mounting base 201. The guide shaft base 102 is mounted on a base 103 and fixed with screws. Considering the detection distance of the laser displacement sensor 205 in this embodiment is between 550-600mm and the size of the vibration table surface, the overall height of the base 103 is selected as 600mm, and the guide shaft 101 is selected as 500mm. The guide shaft 101 passes through the guide shaft base 102 and the base 103. The displacement table mounting base 104 is fitted onto the guide shaft 101. The displacement table connecting plate 105 is tightly attached to the side of the displacement table mounting base 104 and fixed with screws. The rear of the displacement table 106 is tightly attached to the displacement table connecting plate 105 and fixed with screws. The angle limiting rod 211 is screwed into the cantilever fixing base 201 and fixed with a nut at the bottom. The bolts connecting the cantilever mounting base 201 and the cantilever 202 (220mm long, 30mm wide, 12mm high) are half-thread bolts. The bolts pass through the washer, cantilever mounting base 201, washer, thrust bearing 206, washer, cantilever 202, washer, thrust bearing 206, and washer in sequence, and are finally tightened with nuts. The upper surface of the connecting arm 203 is on the same plane as the mounting surface of the cantilever mounting base 201. The bolts connecting the connecting arm 203, cantilever 202, and thrust bearing 206 are longer than the bolts connecting the cantilever 202 and the cantilever mounting base 201. Two cantilever 202s and three thrust bearings 206 are stacked on each side of the connecting arm 203. Angle limiting short rod 210 is screwed into the threaded hole in the middle of the connecting arm 203, and a nut is tightened at the bottom for fixation. The spacing between the connecting holes on the T-shaped cantilever 204 is the same as the spacing between the connecting holes on the connecting arm (203). A thrust bearing 206 and a cantilever 202 are bolted together on one side of the T-shaped cantilever 204. A linear guide rail 208 is mounted on it, and a limit block 209 is mounted on its end face. A sensor mounting bracket 207 is mounted on the linear guide rail 208. The sensor mounting bracket 207 has through holes on its side, through which it is connected to the T-shaped cantilever 204 using T-bolts, thus fixing the position of the laser displacement sensor 205. The laser displacement sensor 205 is connected to the sensor mounting bracket 207 using bolts and nuts.

[0027] like Figure 4 As shown, the cantilever positioning fixing assembly 3 mainly includes a front fixing seat 301, a long bolt 302, and a rear fixing seat 303. Both the front fixing seat 301 and the rear fixing seat 303 are installed on the cantilever 202 and fixed by bolts. The bolt heads are placed in the T-slots, pass through the fixing seats, and are locked with nuts. The long bolt 302 first passes through the through hole on the rear fixing seat 303, and after the long bolt 302 is fitted with a nut, it is screwed into the threaded hole on the front fixing seat 301.

[0028] Among them, the guide shaft base 102 is an open flange type guide shaft base, which uses screws on the side to fix the guide shaft 101 in the axial and circumferential directions.

[0029] The displacement stage mounting base 104 is an open type, and it is fixed to the guide shaft 101 by bolts on the side. When it is used for different vibration tables and blades, the bolts on the side can be loosened to adjust the rotation angle and lifting height, and then the bolts can be tightened to fix the position.

[0030] Among them, such as Figure 5 As shown, the displacement stage connecting plate 105 has a total of 8 threaded holes. The displacement stage mounting base 104 is connected to the middle four threaded holes by screws, and the displacement stage 106 is fixed by screws through the threaded holes on both sides of the displacement stage connecting plate 105.

[0031] The displacement stage 106 is a lead screw type with an adjustment distance of 0-50mm. The displacement stage 106 can be adjusted by rotating the handle and fixed by turning the wrench on the side.

[0032] Among them, the angle limiting short rod 210 and the angle limiting long rod 211 are both semi-threaded screws.

[0033] Among them, such as Figure 7 As shown, the cantilever 202 is the main rotating part. Both the upper and lower surfaces of the cantilever 202 are provided with pads and thrust bearings 206 to reduce friction during rotation.

[0034] Among them, such as Figure 8 As shown, the cantilever 202 has through holes on both sides and a T-slot in the middle. There are a total of 4 cantilever assemblies 2, which are parallel to each other in pairs.

[0035] Among them, such as Figure 9 As shown, the T-shaped cantilever 204 has a groove for mounting the linear guide 208, a T-shaped groove on the side, and a threaded hole on the end face.

[0036] Among them, the long bolt 302 is a fully threaded bolt.

[0037] The front fixing seat 301 has a through hole at one end and a threaded hole at the other end, while the rear fixing seat 303 has through holes at both ends.

[0038] The bolts used to connect the front fixed seat 301 and the rear fixed seat 303 to the cantilever 202 are square head bolts.

[0039] Working principle and usage

[0040] A cylindrical coordinate system is established with the center of the upper surface of the guide shaft mounting base as the origin, the axis of the guide shaft as the Z direction, the distance from the sensor to the axis of the guide shaft as the radial distance, and the angle between the Z direction and the direction perpendicular to the side of the guide shaft mounting base as the azimuth angle. Multiple degrees of freedom of the measuring bracket can be adjusted by changing the height, azimuth angle, and radial distance of the displacement stage.

[0041] When the bracket is installed on a 2-ton vibration table, since the distance between the worktable and the mounting surface is 85mm, the measurement height of the measuring bracket in the Z direction needs to be adjusted to ensure the detection distance of the laser displacement sensor 205. This is achieved by adjusting the displacement table mounting base 104 to position the cantilever assembly 2 appropriately. Similarly, when the bracket is installed on a 3-ton vibration table, the displacement table mounting base 104 also needs to be adjusted to ensure the sensor's detection distance.

[0042] The two cantilever arms 202 near the displacement stage 106, the connecting arm 203, and the cantilever fixing seat 201 together form the first four-bar linkage. The two cantilever arms 202 away from the displacement stage 106, the connecting arm 203, and the T-shaped cantilever arm 204 together form the second four-bar linkage. The distance between the two cantilever arms 202 also changes during the rotation adjustment process. During the rotation of the cantilever arm 202, the front fixing seat 301 and the rear fixing seat 303 are mounted on the cantilever arm 202, but the long bolt 302 is not installed during this process; it is only installed when fixation is required.

[0043] There are three ways to adjust the detection position, but not limited to these three methods. Different usage sequences require different adjustment methods. Method 1: Adjust the radial distance and azimuth angle of the measuring bracket. Rotate the first set of four-bar linkages to the appropriate position, then slide the front and rear fixed seats until their sides coincide, i.e., the threaded hole of the front fixed seat 301 and the through hole of the rear fixed seat 303 are concentric. At this point, pass the long bolt 302 through the rear fixed seat 303, screw the nut into the long bolt 302, and then screw the long bolt 302 into the threaded hole of the front fixed seat 301 until the bolt head of the long bolt 302 is tightly against the rear fixed seat 303. Finally, turn the nut on the long bolt 302 towards the front fixed seat 301 until the nut is tightly against the front fixed seat 301. 01. Fix the distance between the two cantilever arms 202, and fix the position of the first set of four-bar linkages. Rotate the second set of four-bar linkages to a suitable position and fix its position using the cantilever position fixing component 3. Then, the distance can be further adjusted, i.e., slide the linear guide rail 208, and fix the position by tightening the T-bolts on the side of the T-shaped cantilever arm 204; Method 2: Fix the second set of four-bar linkages, rotate the first set of four-bar linkages to a suitable position and fix it, slide the linear guide rail 208 to a suitable position and fix it; Method 3: Adjust both sets of four-bar linkages simultaneously until a suitable detection position is reached and then fix it.

[0044] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-degree of freedom adjusting blade vibration characteristic measurement support, characterized by, The bracket consists of a guide shaft assembly (1), a cantilever assembly (2), and a cantilever position fixing assembly (3). The guide shaft assembly (1) and the cantilever assembly (2) are connected by screws through a cantilever fixing seat (201). The guide shaft base (102) is mounted on the base (103) and fixed with screws. The cantilever position fixing assembly (3) is mounted on the cantilever assembly (2).

2. The measuring support according to claim 1, characterized in that, The guide shaft (101) passes through the guide shaft base (102) and the base (103) in sequence. The displacement stage mounting base (104) is fitted on the guide shaft (101). It is an open structure that allows for angle rotation and height adjustment on the guide shaft (101) via bolts on the side. The displacement stage connecting plate (105) is attached to the side of the displacement stage mounting base (104) and fixed with screws. The displacement stage (106) is a lead screw type with an adjustment distance between 0-50mm. Its rear side is attached to the displacement stage connecting plate (105) and is also fixed with screws.

3. The measurement support of claim 1, wherein, Angle limiting rod (211) is screwed into cantilever fixing seat (201) by thread and fixed at the bottom with nut. The cantilever fixing seat (201) and cantilever (202) are connected by a half thread bolt. The bolt passes through the washer, cantilever fixing seat (201), washer, thrust bearing (206), washer, cantilever (202), washer, thrust bearing and washer in sequence, and finally tightened with nut.

4. The measurement support of claim 1, wherein, The upper surface of the connecting arm (203) is parallel to the mounting surface of the cantilever fixing seat (201). The bolts connecting the connecting arm (203), the cantilever (202) and the thrust bearing (206) are longer than the bolts connecting the cantilever (202) and the cantilever fixing seat (201). On one side of the connecting arm (203), two cantilever (202) and three thrust bearings (206) are connected in a stack. The angle limiting short rod (210) is a semi-threaded rod, which is tightened in the threaded hole in the middle of the connecting arm (203) and fixed at the bottom with a nut.

5. The measurement support of claim 1, wherein, The hole spacing of the connecting holes on the T-shaped cantilever (204) is the same as that of the connecting arms. One side of the T-shaped cantilever (204) is connected to the thrust bearing (206) and the cantilever (202) by bolts. A linear guide rail (208) is installed on it, and a limit block (209) is installed on the end face. The sensor mounting bracket (207) is installed on the linear guide rail (208). It has a through hole on its side. It is connected to the T-shaped cantilever (204) through the through hole using T-bolts, thereby fixing the position of the laser displacement sensor (205). The laser displacement sensor (205) and the sensor mounting bracket (207) are connected by bolts and nuts.

6. The measurement support of claim 1, wherein, The cantilever position fixing assembly (3) consists of a front fixing seat (301), a long bolt (302) and a rear fixing seat (303). The front fixing seat (301) and the rear fixing seat (303) are both installed on the cantilever (202) and fixed by square head bolts. The bolt head is placed in the T-slot, passes through the fixing seat and is locked with a nut. The long bolt (302) is a fully threaded bolt. It first passes through the through hole on the rear fixing seat (303), puts on the nut and then screws into the threaded hole on the front fixing seat (301).

7. The measurement support of claim 2, wherein, The guide shaft base (102) is an open flange type guide shaft base. The guide shaft (101) can be fixed axially and circumferentially by the screws on the side. The displacement table connecting plate (105) is provided with 8 threaded holes and is connected to the displacement table mounting base (104) by screws. The displacement table (106) is fixed by screws through the threaded holes on both sides of the displacement table connecting plate (105).

8. The measurement support of claim 3, wherein, The cantilever (202) is the main rotating part. It has shims and thrust bearings (206) on its upper and lower surfaces to reduce the friction generated during rotation. The cantilever (202) has through holes on both sides and a T-slot in the middle. There are a total of 4 cantilever (202) in the cantilever assembly (2), which are parallel to each other in pairs.

9. The measurement support of claim 5, wherein, The T-shaped cantilever (204) has a groove for mounting the linear guide (208), a T-shaped groove on the side, and a threaded hole on the end face.

10. The measurement support of claim 6, wherein, The front fixing seat (301) has a through hole at one end and a threaded hole at the other end; the rear fixing seat (303) has through holes at both ends.

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