A Turbine Blade Vibration Fatigue Test Fixture and Its Usage Method

Abstract

The present invention discloses a vibration fatigue test fixture for a turbine blade and a method for using the same, which includes a clamping base, a spherical rotating chuck and a blade fastening chuck; a spherical clamping space is provided at the upper end of the clamping base, one end of the spherical rotating chuck is rotatably arranged in the spherical clamping space, and the other end of the spherical rotating chuck is cooperatively connected with the tenon head of the turbine blade to be tested; the spherical rotating chuck includes a connecting ball head, a chuck connecting rod and a U-shaped clamping groove; the connecting ball head is rotatably arranged in the spherical clamping space; the first end of the chuck connecting rod is fixedly connected with the connecting ball head, and the second end of the chuck connecting rod is connected with the U-shaped clamping groove; the blade fastening chuck is arranged at the opening end of the U-shaped clamping groove and is used for cooperatively connecting with the tenon head of the turbine blade to be tested; by adjusting the angle of the spherical rotating chuck in the spherical clamping space, the present invention realizes the adjustment of the clamping angle of the turbine blade to be tested, and meets the test requirements for the vibration response of the turbine blade under different excitation directions.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine test equipment, and particularly relates to a vibration fatigue test fixture for turbine blades and a using method thereof. Background Art

[0002] Turbine blades are key components for realizing the core functions of aero-engines. When working, they are not only affected by thermal shock, thermal stress, gas hot corrosion, etc., but also affected by vibration stress caused by aerodynamic force and excitation; the complex working environment of turbine blades makes the vibration fatigue characteristics of the blades an important factor affecting the safe life of the blades. The purpose of the vibration fatigue test of turbine blades is to obtain the vibration fatigue life and vibration fatigue limit of the blades; generally in a laboratory, a vibration table is used and the resonance dwell method is adopted to apply the same frequency to a certain natural frequency of the blade to test the ability of the blade to work stably for a long time in a resonance environment.

[0003] Since turbine blades have an asymmetric structure, in actual blade vibration tests, different models of blades, different tooling angles, and different excitation directions will cause different vibration responses of the blades; usually, the design of the fixture is required before the blade vibration fatigue test, but the design and manufacture of a tooling fixture require a lot of preliminary exploration or experience accumulation. Once the model of the blade, the tooling angle, or the excitation direction changes, the corresponding tooling fixture cannot be applied; therefore, it is necessary to redesign the blade clamping device, which prolongs the R & D time and affects the test progress.

[0004] For the prior art, the clamping devices for different models of blades are not universal, and the clamping angles of most blade vibration clamping devices are relatively single, and it is impossible to achieve any clamping angle for turbine blades in the vibration fatigue test, so as to obtain the characteristics of the vibration response of turbine blades under different excitation directions in the vibration test. Summary of the Invention

[0005] Aiming at the technical problems existing in the prior art, the present invention provides a vibration fatigue test fixture for turbine blades and a using method thereof to solve the technical problem that the existing blade clamping device cannot achieve any clamping angle for turbine blades in the vibration fatigue test.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a vibration fatigue test fixture for turbine blades, including a clamping base, a spherical rotating chuck, and a blade fastening clamp block; a spherical clamping space is arranged at the upper end of the clamping base, one end of the spherical rotating chuck is rotatably arranged in the spherical clamping space, and the other end of the spherical rotating chuck is cooperatively connected with the tenon of the turbine blade to be tested;

[0008] The spherical rotating chuck includes a connecting ball head, a chuck connecting rod, and a U-shaped clamping groove; the connecting ball head is rotatably arranged in the spherical clamping space; the first end of the chuck connecting rod is fixedly connected to the connecting ball head, and the second end of the chuck connecting rod is connected to the U-shaped clamping groove; the blade fastening clamp block is arranged at the opening end of the U-shaped clamping groove and is used for mating and connecting with the tenon of the turbine blade to be tested.

[0009] Further, the blade fastening clamp block includes a first clamp block and a second clamp block; the first clamp block and the second clamp block are symmetrically and spaced apart at the opening end of the U-shaped clamping groove, and a specimen clamping space is arranged between the first clamp block and the second clamp block; the tenon of the turbine blade to be tested is fixedly fitted in the specimen clamping space.

[0010] Further, the U-shaped clamping groove includes a fixing plate, a first baffle, and a second baffle; the fixing plate is vertically fixed at the end of the second end of the chuck connecting rod, the first baffle is vertically fixed at one end of the fixing plate, and the second baffle is vertically fixed at the other end of the fixing plate;

[0011] The first clamp block and the second clamp block are symmetrically arranged on the fixing plate. One side of the first clamp block is connected to the first baffle by a clamp block fastening bolt, and a first tenon tooth is arranged on the other side of the first clamp block; wherein, the first tenon tooth is meshed and fixed with one side surface of the tenon of the turbine blade to be tested;

[0012] One side of the second clamp block is connected to the second baffle by another clamp block fastening bolt, and a second tenon tooth is arranged on the other side of the second clamp block; wherein, the second tenon tooth is meshed and fixed with the other side surface of the tenon of the turbine blade to be tested.

[0013] Further, it further includes a fastening slide plate and a slide plate fastening bolt; a concave spherical surface is arranged at the center of the upper end surface of the clamping base, and the opening of the concave spherical surface is upward;

[0014] One side of the upper end surface of the clamping base extends upward to form a fixed clamping part, and the other side of the upper end surface of the clamping base extends upward to form a slide plate fixing part; wherein, the fixed clamping part is located on the circumferential side of the concave spherical surface, and the slide plate fixing part is located on the circumferential side of the concave spherical surface on the other side;

[0015] The fastening slide plate is horizontally slidably arranged above the upper end surface of the clamping base and is located between the slide plate fixing part and the concave spherical surface; a slide plate fastening bolt is horizontally arranged between the slide plate fixing part and the fastening slide plate; wherein, one end of the slide plate fastening bolt is connected to the fastening slide plate, and the other end of the slide plate fastening bolt is connected to the slide plate fixing part; the fastening slide plate, the concave spherical surface and the fixed clamping part enclose a spherical clamping space.

[0016] Further, the fixed clamping part includes a V-shaped fixed block and two claw-shaped fixed blocks;

[0017] The V-shaped fixed block is vertically arranged on the upper end surface of the clamping base, and the V-shaped fixed block includes a first fixed block and a second fixed block which are symmetrically arranged; wherein, the horizontal included angle between the first fixed block and the second fixed block is greater than 90°;

[0018] The two claw-shaped fixed blocks are symmetrically arranged on the upper end surface of the clamping base and are respectively arranged at both ends of the V-shaped fixed block; one claw-shaped fixed block is arranged at an interval at the end of the first fixed block, and the other claw-shaped fixed block is arranged at an interval at the end of the second fixed block.

[0019] Further, the inner surfaces of the first fixed block and the second fixed block are both arranged as spherical concave surfaces, and the spherical concave surfaces are tightly attached to the outer surface of the connecting ball head; the inner surface of the claw-shaped fixed block is arranged as a spherical arc surface, and the spherical arc surface is tightly attached to the outer surface of the connecting ball head.

[0020] Further, the slide plate fixing part is located between the two claw-shaped fixed blocks; the slide plate fixing part is an arc-shaped plate structure, and the arc-shaped plate structure is vertically arranged at the edge of the upper end surface of the clamping base and is arranged opposite to the V-shaped fixed block;

[0021] A fastening bolt hole is arranged at the center of the arc-shaped plate structure, and the slide plate fastening bolt horizontally penetrates through the fastening bolt hole; wherein, the first end of the slide plate fastening bolt is fixedly connected to the fastening slide plate, and the second end of the slide plate fastening bolt extends to the outside of the outer side surface of the slide plate fixing part.

[0022] Further, a plurality of track grooves are formed above the upper end surface of the clamping base, and the plurality of track grooves are horizontally and parallelly arranged between the slide plate fixing part and the concave spherical surface;

[0023] The fastening slide plate includes a fastening plate body and a plurality of sliding blocks; the plurality of sliding blocks are evenly arranged at the lower end of the concave arc-shaped plate; the upper end of the sliding block is fixedly connected to the lower end of the fastening plate body, and the lower end of the sliding block is cooperatively arranged in the track groove; the fastening plate body is a concave arc-shaped plate, and the inner side surface of the concave arc-shaped plate is closely attached to the outer surface of the connecting ball head.

[0024] Further, the fixed clamping part includes a V-shaped fixing block;

[0025] The V-shaped fixing block is vertically arranged on the upper end surface of the clamping base, and the V-shaped fixing block includes a symmetrically arranged first fixing block and a second fixing block; wherein, the horizontal included angle between the first fixing block and the second fixing block is 90°; the inner surfaces of the first fixing block and the second fixing block are both arranged as spherical concave surfaces, and the spherical concave surfaces are closely attached to the outer surface of the connecting ball head

[0026] The number of the slide plate fixing parts is two; wherein, both of the two slide plate fixing parts are arc-shaped plate structures; the two arc-shaped plate structures are symmetrically arranged at the edge of the upper end surface of the clamping base, one of the arc-shaped plate structures is arranged opposite to the first fixing block, and the other arc-shaped plate structure is arranged opposite to the second fixing block;

[0027] The number of the fastening slide plates is two, one of the fastening slide plates is horizontally slidably arranged between one of the arc-shaped plate structures and the concave spherical surface, and the other fastening slide plate is horizontally slidably arranged between the other arc-shaped plate structure and the concave spherical surface; wherein, a fastening bolt hole is arranged at the center of the arc-shaped plate structure, and the slide plate fastening bolt horizontally penetrates through the fastening bolt hole; wherein, the first end of the slide plate fastening bolt is fixedly connected to the fastening slide plate, and the second end of the slide plate fastening bolt extends to the outside of the outer side surface of the slide block fixing plate.

[0028] The present invention also provides a using method of a vibration fatigue test fixture for a turbine blade, including the following steps:

[0029] Fix the clamping base on the vibration test bench;

[0030] Connect the tenon of the turbine blade to be tested with the blade fastening clamp block;

[0031] Cooperatively arrange the connecting ball head in the spherical clamping space to install and clamp the spherical rotating chuck with the turbine blade to be tested on the clamping base;

[0032] Adjust the direction of the connecting ball head in the spherical clamping space to make the direction of the turbine blade to be tested match the vibration excitation direction in the turbine blade vibration test; thus, the clamping and fixing of the turbine blade to be tested is completed.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] The present invention provides a vibration fatigue test fixture for a turbine blade and a method for using the same. By providing a spherical clamping space on the upper end surface of the clamping base, and fitting a connecting ball head into the spherical clamping space to realize the rotation of the spherical rotating chuck at any angle. Through the adjustment of the angle of the spherical rotating chuck in the spherical clamping space, the clamping angle of the turbine blade to be tested can be adjusted to meet the test requirements for the vibration response of the turbine blade under different excitation directions. The device has a simple structure, can be directly used on a vibration test bench with good generality, is easy to operate, and has high reliability.

[0035] Furthermore, two clamping blocks are symmetrically arranged in the U-shaped clamping groove at the end of the chuck connecting rod, and the tenons of the turbine blade to be tested are cooperatively fixed by the two clamping blocks, meeting the clamping and fixing requirements for turbine blades of different models and improving the universality of the fixture.

[0036] Furthermore, a fastening slide plate is connected to a slide plate fixing part by a slide plate fastening bolt to realize the arbitrary fixation of the spherical rotating chuck, ensuring the convenience of installation and disassembly of the fixture, and at the same time ensuring the reliability of the clamping effect of the fixture.

[0037] Furthermore, the fixed clamping part adopts a combination mode of a V-shaped fixing block and two claw-shaped fixing blocks, or the fixed clamping part is set as the cooperation of a V-shaped fixing block and two fastening slide plates to realize the clamping and fixing of the connecting ball head, facilitating the angle adjustment of the spherical rotating chuck and effectively improving the reliability of the fixture.

[0038] Furthermore, the inner surfaces of the two fixing blocks are set as spherical concave surfaces, and the outer surface of the connecting ball head is closely attached to the spherical concave surface, so that the connecting ball head and the fixed clamping part are in surface contact, effectively restricting the displacement between the internal parts of the fixture and ensuring the accuracy of the test results.

[0039] Furthermore, the slider fixing plate is set as an arc-shaped plate structure, and the arc-shaped plate structure is connected to the slider fixing plate by a sliding fastening bolt, facilitating the angle adjustment of the spherical rotating chuck and ensuring the installation and disassembly of the fixture.

[0040] Furthermore, the fastening slide plate is slidably arranged in the track groove on the upper end surface of the clamping base through a slider, ensuring the accuracy of the adjustment process of the fastening slide plate. Description of the Drawings

[0041] To more clearly illustrate the technical solutions of the specific embodiments of the present invention, the following briefly introduces the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a schematic perspective view of the clamping base in Embodiment 1;

[0043] Figure 2 It is a top view of the clamping base in Embodiment 1;

[0044] Figure 3 It is a schematic perspective view of the fastening slide plate in Embodiment 1;

[0045] Figure 4 It is a schematic perspective view of the slide plate fastening bolt in Embodiment 1;

[0046] Figure 5 It is a schematic perspective view of the spherical rotary chuck in Embodiment 1;

[0047] Figure 6 It is a schematic perspective view of the blade fastening clamp block in Embodiment 1;

[0048] Figure 7 It is a schematic perspective view of the clamp block fastening bolt in Embodiment 1;

[0049] Figure 8 It is a coordinate system definition diagram of the turbine blade to be tested in Embodiment 1;

[0050] Figure 9 It is a schematic diagram of the clamping state when the vibration excitation direction is along the X-axis direction of the turbine blade to be tested in Embodiment 1;

[0051] Figure 10 It is a schematic diagram of the clamping state when the vibration excitation direction is along the Y-axis direction of the turbine blade to be tested in Embodiment 1;

[0052] Figure 11 It is a schematic diagram of the clamping state when the vibration excitation direction is along the Z-axis direction of the turbine blade to be tested in Embodiment 1;

[0053] Figure 12 It is a schematic diagram of the clamping state when the vibration excitation direction is along the 45° direction of the Z-axis of the turbine blade to be tested in Embodiment 1;

[0054] Figure 13 It is a schematic perspective view of the clamping base in Embodiment 2;

[0055] Figure 14It is the top view of the clamping base in Embodiment 2;

[0056] Figure 15 It is a schematic diagram of the clamping state when the vibration excitation direction in Embodiment 2 is along the X-axis direction of the turbine blade to be tested.

[0057] Among them, 1 is the clamping base, 2 is the fastening slide plate, 3 is the slide plate fastening bolt, 4 is the spherical rotating chuck, 5 is the blade fastening clamp block, 6 is the clamp block fastening bolt, 7 is the turbine blade to be tested; 11 is the base body, 12 is the base connecting plate, 13 is the fixed clamping part, 14 is the slide plate fixing part; 111 is the track groove; 131 is the V-shaped fixing block, 132 is the claw-shaped fixing block; 141 is the fastening bolt hole; 41 is the connecting ball head, 42 is the chuck connecting rod, 43 is the U-shaped clamping groove; 51 is the first clamp block, 52 is the second clamp block; 61 is the fastening bolt body, 62 is the fastening backing plate. Specific implementation manners

[0058] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the following specific embodiments are used to further elaborate on the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0059] The present invention provides a turbine blade vibration fatigue test fixture, including a clamping base 1, a fastening slide plate 2, a slide plate fastening bolt 3, a spherical rotating chuck 4 and a blade fastening clamp block 5; the center of the upper end surface of the clamping base 1 is provided with a concave spherical surface, and the opening of the concave spherical surface is upward; one side of the upper end surface of the clamping base 1 extends upward to form a fixed clamping part 13, and the other side of the upper end surface of the clamping base 1 extends upward to form a slide plate fixing part 14; among them, the fixed clamping part 13 is located on the circumferential side of the concave spherical surface, and the slide plate fixing part 14 is located on the circumferential side of the concave spherical surface.

[0060] The fastening slide plate 2 is horizontally slidably arranged above the upper end surface of the clamping base 1 and is located between the slide plate fixing part 14 and the concave spherical surface; the slide plate fastening bolt 3 is horizontally arranged between the slide plate fixing part 14 and the fastening slide plate 2; among them, one end of the slide plate fastening bolt 3 is connected to the fastening slide plate 2, and the other end of the slide plate fastening bolt 3 is connected to the slide plate fixing part 14; the fastening slide plate 2, the concave spherical surface and the fixed clamping part 13 enclose a spherical clamping space.

[0061] One end of the spherical rotary chuck 4 is rotatably arranged in the spherical clamping space, and the other end of the spherical rotary chuck 4 is cooperatively connected with the tenon of the turbine blade 7 to be tested; the spherical rotary chuck 4 includes a connecting ball head 41, a chuck connecting rod 42 and a U-shaped clamping groove 43; the connecting ball head 41 is rotatably arranged in the spherical clamping space; the first end of the chuck connecting rod 42 is fixedly connected with the connecting ball head 41, and the second end of the chuck connecting rod 42 is connected with the U-shaped clamping groove 43; the blade fastening clamp block 5 is arranged at the opening end of the U-shaped clamping groove 43 for cooperatively connecting with the tenon of the turbine blade 7 to be tested.

[0062] When the turbine blade vibration fatigue test fixture of the present invention is used, the clamping base 1 is fixed on the vibration test bench; the turbine blade 7 to be tested is installed at the second end of the chuck connecting rod 42; the connecting ball head 41 is cooperatively arranged in the spherical clamping space to install the spherical rotary chuck 4 with the turbine blade 7 to be tested on the clamping base 1; the direction of the connecting ball head 41 in the spherical clamping space is adjusted so that the direction of the turbine blade to be tested matches the vibration excitation direction in the turbine blade vibration test; the connecting ball head 41 is fixed in the spherical clamping space by adjusting the slide plate fastening bolt 3 and using the fastening slide plate 2, that is, the clamping and fixing of the turbine blade 7 to be tested is completed.

[0063] In the present invention, a spherical clamping space is arranged on the upper end surface of the clamping base; the connecting ball head is cooperatively arranged in the spherical clamping space to realize the rotation of the spherical rotary chuck at any angle; through the adjustment of the angle of the spherical rotary chuck in the spherical clamping space, the clamping angle of the turbine blade to be tested is adjusted to meet the test requirements for the vibration response of the turbine blade under different excitation directions; the device has a simple structure, can be directly used on a vibration test bench with good generality, is convenient to operate and has high reliability.

[0064] Embodiment 1

[0065] As shown in the attached Figures 1-7 figure, Embodiment 1 of the present invention provides a turbine blade vibration fatigue test fixture, including a clamping base 1, a fastening slide plate 2, a slide plate fastening bolt 3, a spherical rotary chuck 4, a blade fastening clamp block 5 and a clamp block fastening bolt 6.

[0066] The clamping base 1 is horizontally arranged on the vibration test bench, and the clamping base 1 includes a base body 11 and a base connecting plate 12; the base body 11 is concentrically arranged above the base connecting plate 12, and the lower end of the base body 11 is fixedly arranged at the center of the upper surface of the base connecting plate 12; a concave spherical surface is arranged at the center of the upper end surface of the base body 11, and the opening of the concave spherical surface is upward.

[0067] One side of the upper end surface of the base body 11 extends upward to form a fixed clamping part 13, and the other side of the upper end surface of the base body 11 extends upward to form a slider fixing plate 14; wherein, the fixed clamping part 13 is located on one side of the circumference of the concave spherical surface, and the slider fixing part 14 is located on the other side of the circumference of the concave spherical surface; a plurality of fixed connection holes are evenly arranged around the base connecting plate 12, and fixing bolts are arranged in the fixed connection holes; the upper end of the fixing bolt is connected to the base connecting plate 12, and the lower end of the fixing bolt is connected to the vibration test bench.

[0068] The fastening slider 2 is horizontally slidably arranged above the upper end surface of the base body 11 and is located between the slider fixing part 14 and the concave spherical surface; the slider fastening bolt 3 is horizontally arranged between the slider fixing part 14 and the fastening slider 2; wherein, one end of the slider fastening bolt 3 is connected to the fastening slider 2, and the other end of the slider fastening bolt 3 is connected to the slider fixing part 14; the fastening slider 2, the concave spherical surface and the fixed clamping part 13 enclose a spherical clamping space.

[0069] In this embodiment 1, the clamping and fixing part 13 includes a V-shaped fixing block 131 and two claw-shaped fixing blocks 132; the V-shaped fixing block 131 is vertically arranged on the upper end surface of the base body 11, and the V-shaped fixing block 131 includes a first fixing block and a second fixing block which are symmetrically arranged; wherein, the included angle between the first fixing block and the second fixing block is greater than 90°; the inner surfaces of the first fixing block 131 and the second fixing block 132 are both set as spherical concave surfaces, and the spherical concave surfaces are arranged close to one side of the concave spherical surface; the spherical concave surfaces are tightly attached to the outer surface of the connecting ball head in the spherical rotating chuck 4.

[0070] The two claw-shaped fixing blocks 132 are symmetrically arranged on the upper end surface of the base body 11 and are respectively arranged at both ends of the V-shaped fixing block 131; one claw-shaped fixing block is arranged at an interval at the end of the first fixing block, and the other claw-shaped fixing block is arranged at an interval at the end of the second fixing block; the inner surface of the claw-shaped fixing block 132 is set as a spherical arc surface, and the spherical arc surface is arranged close to one side of the concave spherical surface; wherein, the spherical arc surface is tightly attached to the outer surface of the connecting ball head in the spherical rotating chuck 4.

[0071] In the first embodiment, the skateboard fixing part 14 is located between the two claw-shaped fixing blocks 132; the skateboard fixing part 14 is an arc-shaped plate structure, which is vertically arranged at the edge of the upper end surface of the base body 11 and is arranged opposite to the V-shaped fixing block 131; wherein, the vertical symmetry axis of the V-shaped fixing block 131 is parallel to the vertical central axis of the arc-shaped plate, and the vertical symmetry axis of the V-shaped fixing block 131 is the vertical intersection line of the first fixing block and the second fixing block; a fastening bolt hole 141 is arranged at the center of the arc-shaped plate structure, and the skateboard fastening bolt 3 horizontally penetrates through the fastening bolt hole 141; wherein, the first end of the skateboard fastening bolt 3 is fixedly connected to the fastening skateboard 2, and the second end of the skateboard fastening bolt 3 extends outward to the outer side of the outer side surface of the skateboard fixing part 14.

[0072] A plurality of track grooves 111 are arranged above the upper end surface of the base body 11, and the plurality of track grooves 111 are horizontally arranged in parallel between the skateboard fixing part 14 and the concave spherical surface; the fastening skateboard 2 includes a fastening plate body and a plurality of sliders, and the plurality of sliders are evenly arranged at the lower end of the fastening plate body, and the upper end of the slider is fixedly connected to the lower end of the concave arc-shaped plate, and the lower end of the slider is arranged in the track groove 111 in a matching manner; the fastening plate body is a concave arc-shaped plate, and the inner side surface of the concave arc-shaped plate is closely attached to the outer surface of the connecting ball head in the spherical rotary chuck 4; wherein, the cross-sectional shape of the slider matches the cross-sectional shape of the track groove 111, and both adopt a trapezoidal structure with a smaller upper part and a larger lower part; a fixing blind hole is arranged at the center of the outer side surface of the fastening plate body, and the first end of the skateboard fastening bolt 3 is arranged in the fixing blind hole in a matching manner.

[0073] In the first embodiment, the spherical rotary chuck 4 includes a connecting ball head 41, a chuck connecting rod 42 and a U-shaped clamping groove 43; the connecting ball head 41 is arranged in the spherical clamping space in a matching manner; wherein, the connecting ball head 41 can rotate in the ball head clamping space; the first end of the chuck connecting rod 41 is fixedly connected to the outer spherical surface of the connecting ball head 41, and the second end of the ball head connecting rod 42 is fixedly connected to the U-shaped clamping groove 43; wherein, the open end of the U-shaped clamping groove 43 is arranged on the side away from the second end of the ball head connecting rod 42; the U-shaped clamping groove 43 includes a fixing plate, a first baffle and a second baffle, and the fixing plate is vertically fixed at the end of the second end of the chuck connecting rod 42; the first baffle is vertically fixed at one end of the fixing plate, and the second baffle is vertically fixed at the other end of the fixing plate.

[0074] The blade fastening clamp block 5 is arranged at the open end of the U-shaped clamping groove 43. The blade fastening clamp block 5 includes a first clamp block 51 and a second clamp block 52. The first clamp block 51 and the second clamp block 52 are symmetrically and spaced apart at the open end of the U-shaped clamping groove 43. Among them, a test piece clamping space is arranged between the first clamp block 51 and the second clamp block 52. The tenon of the turbine blade 7 to be tested is fixedly fitted in the test piece clamping space. The first clamp block 51 and the second clamp block 52 are symmetrically arranged on the fixed plate. One side of the first clamp block 51 is connected to the first baffle through a clamp block fastening bolt 6. A first tenon tooth is arranged on the other side of the first clamp block 51. Among them, the first tenon tooth is fixedly meshed with one side surface of the tenon of the turbine blade 7 to be tested. One side of the second clamp block 52 is connected to the second baffle through another clamp block fastening bolt 6. A second tenon tooth is arranged on the other side of the second clamp block 52. Among them, the second tenon tooth is fixedly meshed with the other side surface of the tenon of the turbine blade 7 to be tested.

[0075] In the first embodiment, fastening bolt holes are respectively arranged at the centers of the first baffle and the second baffle. The clamp block fastening bolt 6 includes a fastening bolt body 61 and a fastening backing plate 62. The fastening bolt body 61 is fitted in the fastening bolt hole. The fastening backing plate 62 is vertically fixed at the first end of the fastening bolt body 61. One side of the fastening backing plate 62 is in close contact with the first clamp block or the second clamp block. The other side of the fastening backing plate 62 is fixedly connected to the first end of the fastening bolt body 61. The other end of the fastening bolt body 61 extends outward to the outer side surface of the first baffle or the second baffle.

[0076] Working principle and usage method:

[0077] For the turbine blade vibration fatigue test fixture described in the first embodiment, through the clamping action of the test fixture on the turbine blade to be tested, it can meet the vibration fatigue test of the turbine blade to be tested in any excitation direction on a common type of vibration test bench. The usage method of the test fixture specifically includes the following steps:

[0078] First, use the fixing bolts to fix the base connecting plate on the vibration test bench to realize the fixed connection between the clamping base and the vibration test bench. Insert the slider at the lower end of the fastening slide plate into one end of the track groove to horizontally slidably arrange the fastening slide plate on the base body.

[0079] Then, move the fastening slide plate to the other end of the track groove, that is, move the fastening slide plate to be arranged near one end of the slide plate fixing part.

[0080] After that, remove the spherical rotary chuck; loosen the chuck fastening bolt so that the blade fastening chuck faces the chuck fastening bolt and is arranged in the U-shaped chuck groove in cooperation;

[0081] Next, align the tenon of the turbine blade to be tested with the blade fastening chuck, and make the first tenon teeth on the first chuck mesh and fix with one side of the tenon of the turbine blade to be tested, and make the second tenon teeth on the second chuck mesh and fix with the other side of the tenon of the turbine blade to be tested; and tighten the chuck fastening bolt to clamp and fix the tenon of the turbine blade to be tested by using the first chuck and the second chuck, so as to realize clamping and fixing the turbine blade to be tested on the spherical rotary chuck;

[0082] Next, install the spherical rotary chuck with the turbine blade to be tested on the base body, that is, arrange the connecting ball head in the spherical clamping space in cooperation; select and determine a predetermined angle or any angle through the angles of the angle measuring device and the connecting ball head in different directions;

[0083] Next, screw the slide plate fastening bolt into the fastening bolt hole, and make the second end of the slide plate fastening bolt abut against the blind hole on the outer side of the fastening slide plate until the fastening slide plate fixes the connecting ball head in the spherical clamping space;

[0084] Finally, start the vibration test bench to perform the vibration fatigue test on the turbine blade in the vibration excitation direction of a predetermined angle or any angle.

[0085] The turbine blade vibration fatigue test fixture and its use method described in Embodiment 1 of the present invention can meet the clamping requirements for any angle of the turbine blade; the clamping base 1, the fastening slide plate 2 and the slide plate fastening bolt 3 form a base combination mechanism, and the spherical rotary chuck 4, the blade fastening chuck 5 and the chuck fastening bolt 6 form a rotary clamping combination mechanism; wherein, the base combination mechanism is arranged on the vibration test bench, one end of the rotary clamping combination mechanism is rotatably arranged in the base combination mechanism, and the other end of the rotary clamping combination mechanism is used for clamping and fixing the turbine blade 7 to be tested.

[0086] In the first embodiment, the base body 11 is of a cylindrical structure. The center of the upper end surface of the base body 11 is provided with a concave spherical surface, and the radius of the concave spherical surface matches the spherical surface size of the lower end of the connecting ball head 41. The upper end surface of the base body 11 is further provided with a plurality of track grooves, and the track grooves are located at the circular edge of the concave spherical surface. The cross-section of the track groove is of a trapezoidal structure. The bottom of the fastening slide plate 2 is provided with a slider matching the track groove, and the cross-section of the slider is of a trapezoidal structure. Among them, the slider is fitted in the track groove to realize the horizontal sliding of the fastening slide plate 2 on the upper end surface of the base body 11. The base connecting plate 12 is of a disc-shaped plate structure, and the base connecting plate 12 is concentrically arranged with the base body 11 up and down. A plurality of fixed connection holes are evenly arranged on the circumference of the base connecting plate 12, so that the clamping base can be fixed on the vibration test bench through fixing bolts.

[0087] In the first embodiment, the fixed clamping part 13 and the slide plate fixing part 14 are both arranged on the upper end surface of the base body 11. Among them, the fixed clamping part 13 includes a V-shaped fixing block 131 and two claw-shaped fixing blocks 132. The vertical heights of the V-shaped fixing block 131, the two claw-shaped fixing blocks 132 and the slide plate fixing part 14 are the same. The V-shaped fixing block 131 is located at the 0° position of the upper end surface of the base body 11, the first claw-shaped fixing block is located at the 90° position of the upper end surface of the base body 11, the slide plate fixing part 14 is located at the 180° position of the upper end surface of the base body 11, and the second claw-shaped fixing block is located at the 270° position of the upper end surface of the base body 11. Among them, the V-shaped fixing block includes a first fixing block and a second fixing block distributed in a V shape. The V-shaped fixing block is a symmetrical structure, and its inner surface is provided with a spherical concave surface for increasing the contact area with the connecting ball head. The slide plate fixing part 14 is a shell structure coaxial with the base body 11. The horizontal axis position of the slide plate fixing part 14 is parallel to the track groove, and the end of the track groove extends to the lower end of the inner surface of the slide plate fixing part 14. The curved surface radius of the outer surface of the slide plate fixing part 14 is the same as the radius of the base body 11, and a fastening bolt hole is opened at the geometric center of the slide plate fixing part 14 for cooperation with the slide plate fastening bolt 3. The claw-shaped fixing block is a structure that restricts the connecting ball head 41 from generating a linear displacement in space. The curved surface radius of the inner surface of the claw-shaped fixing block is the same as the radius of the restricted connecting ball head 41, and it can form a rotational fit with the connecting ball head 41.

[0088] In Embodiment 1, the fastening slide plate 2 includes a fastening plate body and a number of sliders. Among them, a fixed blind hole is provided at the center of the outer surface of the fastening plate body. The number of the sliders are frustum-shaped protrusions provided at the bottom end of the fastening plate body. The inner surface of the fastening plate body is a spherical surface that can closely cooperate with the constrained connecting ball head. The inner surface of the fastening plate body can be roughened, or a rubber layer can be added to increase the friction coefficient with the connecting ball head. The outer surface of the fastening plate body is a curved surface that can cooperate with the inner surface of the slide plate fixing portion 14. The radius of the curved surface of the outer surface of the fastening plate body is the same as the radius of the inner surface of the slide plate fixing portion 14. A fixed blind hole with the same radius as the slide plate fastening bolt 3 and the fastening bolt hole is provided at the geometric center of the fastening plate body. The bottom surface of the fastening plate body is provided with a number of frustum-shaped protrusions as sliders. The cross-section of the slider is the same as the cross-section of the track groove, and both are trapezoidal cross-sections, so that the slider can be placed in the track groove for sliding.

[0089] In Embodiment 1, the slide plate fastening bolt 3 includes a butterfly-shaped fastening bolt. One end of the butterfly-shaped fastening bolt is provided with a symmetric water-drop-shaped ring structure, and the formed butterfly-shaped fastening bolt head increases the torque during use, thus achieving a labor-saving use effect. The middle section of the butterfly-shaped fastening bolt is a thread used to cooperate with the fastening bolt hole. The thread does not extend to the other end of the butterfly-shaped fastening bolt. The side surface of the other end of the butterfly-shaped fastening bolt is a smooth curved surface, which can cooperate with the fixed blind hole on the fastening slide plate, and the smooth curved surface increases the contact area during cooperation.

[0090] In Embodiment 1, the spherical rotating chuck 4 includes a connecting ball head 41, a chuck connecting rod 42 and a U-shaped clamping groove 43. The connecting ball head 41, the chuck connecting rod 42 and the U-shaped clamping groove 43 are spliced to form a steel combined chuck. Among them, the connecting ball head 41 can cooperate with the spherical surface structures on the base body and the fastening slide plate. The surface of the connecting ball head 41 is roughened to increase the friction with the fastening slide plate, so as to better fix the clamping angle of the spherical rotating chuck. The cross-section of the chuck connecting rod 42 is a cross-shaped structure, and the fixing plate of the U-shaped clamping groove 43 is vertically fixed to the end of the chuck connecting rod 42. Two threaded through holes are respectively provided on the first baffle and the second baffle of the U-shaped clamping groove 43, and the chuck fastening bolt 6 is cooperatively arranged in the threaded through holes.

[0091] In Embodiment 1, the blade fastening clamp block 5 includes a first clamp block 51 and a second clamp block 52 which are symmetrically arranged; on one side of the first clamp block 51 or the second clamp block 52, two cylindrical grooves are provided, and the end of the clamp block fastening bolt 6 is fitted in the cylindrical groove; on the other side of the first clamp block 51, a first tenon tooth is provided; the first tenon tooth is meshed and fixed with one side surface of the tenon head of the turbine blade 7 to be tested; on the other side of the second clamp block 52, a second tenon tooth is provided, and the second tenon tooth is meshed and fixed with the other side surface of the tenon head of the turbine blade 7 to be tested; in terms of size, the blade fastening clamp block is slightly smaller than the size structure of the U-shaped clamping groove, so that it can slide into the U-shaped clamping groove after clamping the blade and is fixedly fitted through the clamp block fastening bolt 6.

[0092] In Embodiment 1, the clamp block fastening bolt 6 includes a fastening bolt body 61 and a fastening backing plate 62; wherein, the structure of the fastening bolt body 61 is similar to that of the slide plate fastening bolt 3; by arranging the fastening backing plate 62 in the clamp block fastening bolt 6, the contact area with the blade fastening clamp block is increased, and further the clamping area of the clamp block fastening bolt 6 on the blade fastening clamping block is increased, thereby enhancing the clamping effect of the device on the blade.

[0093] It should be noted that in Embodiment 1, in the turbine blade 7 to be tested, the extending direction of the blade body is defined as the Z-axis direction, the width direction of the tenon head is defined as the X-axis direction, and the thickness direction of the tenon head is defined as the Y-axis direction; and a rectangular coordinate system is established according to the Z-axis direction, X-axis direction and Y-axis direction to illustrate the clamping angle of the turbine blade 7 to be tested, as shown in the appendix Figure 8 described.

[0094] As shown in the appendix Figure 9 described, the appendix Figure 9 shows a schematic clamping state diagram in Embodiment 1 where the vibration excitation direction is along the X-axis direction of the turbine blade 7 to be tested; wherein, the chuck connecting rod 42 is horizontally arranged and placed between one of the claw-shaped fixing blocks and the slide plate fixing part, and the width direction of the tenon head of the turbine blade 7 to be tested is vertically arranged.

[0095] As shown in the appendix Figure 10 shown, the appendix Figure 10 shows a schematic clamping state diagram in Embodiment 1 where the vibration excitation direction is along the Y-axis direction of the turbine blade 7 to be tested; wherein, the chuck connecting rod 42 is horizontally arranged and placed between one of the claw-shaped fixing blocks and the slide plate fixing part, and the width direction of the tenon head of the turbine blade 7 to be tested is horizontally arranged.

[0096] As shown in the appendix Figure 11 shown, the appendix Figure 11The schematic diagram of the clamping state in Embodiment 1 with the vibration excitation direction along the Z-axis direction of the turbine blade to be tested is given; wherein, the chuck connecting rod 42 is arranged vertically.

[0097] As shown in the appendix Figure 12 shown, in the appendix Figure 12 The schematic diagram of the clamping state in Embodiment 1 with the vibration excitation direction along the 45° direction of the Z-axis of the turbine blade to be tested is given; wherein, the chuck connecting rod 42 is arranged along the 45° direction of the Z-axis.

[0098] It can be seen from this that the turbine blade vibration fatigue test fixture described in this Embodiment 1 meets the clamping effects of the turbine blade 7 to be tested at different clamping angles under vibration excitation in different directions, and achieves the purpose of obtaining the vibration response characteristics of the turbine blade under different excitation directions in the vibration test.

[0099] Embodiment 2

[0100] This Embodiment 2 provides a turbine blade vibration fatigue test fixture; the structure and principle of the turbine blade vibration fatigue test fixture described in this Embodiment 2 are basically the same as those in the above Embodiment 1; the difference is that, as shown in the appendix Figures 13-14 shown:

[0101] In this Embodiment 2, the fixed clamping portion 13 includes a V-shaped fixed block 131; the V-shaped fixed block 131 is vertically arranged on the upper end surface of the clamping base 1, and the V-shaped fixed block 131 includes a first fixed block and a second fixed block which are symmetrically arranged; wherein, the horizontal angle between the first fixed block and the second fixed block is 90°; the inner surfaces of the first fixed block and the second fixed block are both arranged as spherical concave surfaces, and the spherical concave surfaces are tightly attached to the outer surface of the connecting ball head 41.

[0102] The number of the slide plate fixing portions 14 is two; wherein, both of the two slide plate fixing portions 14 are arc-shaped plate structures; the two arc-shaped plate structures are symmetrically arranged at the edge of the upper end surface of the clamping base 1, one of the arc-shaped plate structures is arranged opposite to the first fixed block, and the other arc-shaped plate structure is arranged opposite to the second fixed block.

[0103] The number of the fastening slide plates 2 is two, one of the fastening slide plates is horizontally slidably arranged between one of the arc-shaped plate structures and the inner concave spherical surface, and the other fastening slide plate is horizontally slidably arranged between the other arc-shaped plate structure and the inner concave spherical surface.

[0104] A fastening bolt hole 141 is provided at the center of the arc-shaped plate structure, and the skateboard fastening bolt 3 is horizontally penetrated through the fastening bolt hole 141; wherein, the first end of the skateboard fastening bolt 3 is fixedly connected to the fastening skateboard 2, and the second end of the skateboard fastening bolt 3 extends outward to the outer side of the slider fixing plate 14.

[0105] In the second embodiment, in the base combination mechanism, the structure of the fixed clamping portion 13 and the number of the skateboard fixing portions 14 and the fastening skateboards 2 are adjusted; the first fixing block and the second fixing block arranged at a right angle are used to replace the first fixing block and the second fixing block distributed in a V shape, and a plurality of track grooves are respectively arranged on the front sides of the first fixing block and the second fixing block, so that the two fastening skateboards 2 are slidably arranged on the upper end surface of the base body; the rest of the structure of the second embodiment is basically the same as that of the first embodiment, and will not be described herein again.

[0106] As shown in the Figure 15 accompanying Figure 15 drawings, a schematic diagram of the clamping state in the second embodiment when the vibration excitation direction is along the X-axis direction of the turbine blade to be tested is given; wherein, the chuck connecting rod 42 is horizontally arranged and placed between the two skateboard fixing portions, and the width direction of the tenon of the turbine blade 7 to be tested is vertically arranged; similarly, the test fixture in the second embodiment can achieve the purpose of the vibration response characteristics of the turbine blade under other different excitation directions similar to those in the first embodiment.

[0107] Working principle and usage method:

[0108] For the turbine blade vibration fatigue test fixture described in the second embodiment, through the clamping action of the test fixture on the turbine blade to be tested, it is possible to satisfy the vibration fatigue test of the turbine blade to be tested in any excitation direction on an ordinary type of vibration test bench; the usage method of the test fixture specifically includes the following steps:

[0109] First, fixedly connect the base connecting plate to the vibration test bench, respectively embed the sliders on the bottom surfaces of the two fastening skateboards into the base from one end of the track groove, and slide the fastening skateboards to the other end of the track groove; remove the spherical rotating chuck, unscrew the chuck fastening bolt, align the blade fastening chuck with the chuck fastening bolt and slide it into the U-shaped chuck groove.

[0110] Next, align the tenon of the turbine blade to be tested with the corresponding tenon teeth portion on the blade fastening chuck, and after meshing, tighten the chuck fastening bolt to achieve the effect of clamping the blade.

[0111] Then, place the spherical rotating chuck holding the blade in the spherical clamping space, and select and determine a predetermined angle or any angle by the angles of the angle measuring device and the connecting ball head in different directions; screw the slide fastening bolt into the fastening bolt hole in the slide fixing part, and continue to rotate the slide fastening bolt. Its end is embedded in the fixing blind hole on the fastening slide and makes the fastening slide approach forward until the fastening slide fixes the spherical rotating chuck.

[0112] Finally, start the vibration test bench to conduct the blade vibration fatigue test; thus, it can achieve any clamping angle for the turbine blade in the vibration fatigue test, so as to obtain the vibration response characteristics of the turbine blade under different excitation directions in the vibration test; different blade fastening blocks are equipped when testing the vibration fatigue characteristics of different models of blades to adapt to the tenon tooth sizes of different models of blades; in the actual use process, the operation process is simple, which can greatly improve the test work efficiency and reduce the test cost.

[0113] For the turbine blade vibration fatigue test fixture and its use method of the present invention, the tenon tooth part of the blade can be clamped by the blade fastening block, and the tenon tooth part of the blade and the blade fastening block part of the device adopt surface contact and are closely matched; the clamping base is a steel structure composed of two coaxial cylindrical bodies with different diameters combined up and down, and different functional structures are respectively added to the upper and lower two cylinders.

[0114] In the present invention, the V-shaped fixing block on the upper end surface of the base body is a symmetrical structure, and its inner surface is provided with a spherical concave surface for increasing the contact area with the connecting ball head; the claw-shaped fixing block is a structure for restricting the linear displacement of the connecting ball head in space, and the radius of the curved surface of its inner surface is the same as the radius of the constrained connecting ball head, and it can form a rotational fit with the connecting ball head; the radius of the curved surface of the inner concave spherical surface on the upper end surface of the base body is the same as the radius of the constrained sphere, and it can form a rotational fit with the sphere; among them, the spherical concave surface on the inner surface of the V-shaped fixing block, the inner surface of the claw-shaped fixing block, the inner concave spherical surface, and the inner surface of the fastening slide all have the same radius of the curved surface, and its value is equal to the radius of the connecting ball head.

[0115] In the present invention, the spherical rotating chuck includes a steel combined part formed by a connecting ball head, a chuck connecting rod, and a U-shaped clamping groove; among them, the connecting ball head can cooperate with the spherical surface structures on the base body and the fastening slide; the U-shaped clamping groove includes a fixing plate and two baffles. The fixing plate is perpendicularly connected to the chuck connecting rod, and the two baffles are symmetrically arranged vertically at both ends of the fixing plate. Two identical threaded through holes are symmetrically arranged on each baffle respectively; the blade fastening block includes a pair of identically shaped blocks; one side of the chuck meshes with the tenon of the turbine blade, and two cylindrical grooves are symmetrically arranged on the other side of the chuck for cooperating with the block fastening bolt.

[0116] In the present invention, the turbine blade is clamped in the U-shaped clamping groove of the spherical rotating chuck by the blade fastening clamp block and the clamp block fastening bolt; by providing a spherical clamping space on the upper end surface of the clamping base and fitting the connecting ball head in the spherical clamping space to restrict the displacement of the sphere in space, the spherical rotating chuck can freely rotate within the space range with the clamping base and the connecting ball head as the rotation centers, so as to achieve the purpose of providing any clamping angle for the clamped turbine blade.

[0117] The turbine blade vibration fatigue test fixture and its usage method according to the present invention are different from the traditional method of fixing a sphere with three points in a plane. In order to improve the stability of fixing the connecting ball head, the present invention adopts a surface contact method at the mating part of the clamping base and the spherical rotating chuck. When tightening the slide plate fastening bolt, the contact area between the fastening slide plate and the connecting ball head can be increased, which can improve the reliability of the device during use, and the larger contact area can better limit the displacement between the internal parts of the fixture during the vibration test, thereby improving the test accuracy.

[0118] In the present invention, by roughening the surface of the connecting ball head and pasting a rubber thin layer on the inner surface of the fastening slide plate, the friction coefficient between the fastening slide plate and the connecting ball head can be effectively increased, preventing the phenomenon of mutual sliding between the spherical rotating chuck and the clamping base and the fastening slide plate when tightening the spherical rotating chuck, improving the stability during the test process, and playing a promoting role in further improving the test accuracy.

[0119] In the present invention, the frustum-shaped protrusion provided at the bottom of the fastening slide plate is used as a slider, which can be slidably disposed in the track groove on the clamping base; the cross-section of the frustum-shaped protrusion of the fastening slide plate is trapezoidal, with the same shape as the cross-section of the track groove, and the frustum-shaped protrusion strengthens the connection and cooperation between the clamping base and the fastening slide plate, improving the reliability of the cooperation between the various parts of the device.

[0120] The end of the clamp block fastening bolt adopted in the present invention uses a large-size cylindrical fastening backing plate, which can reduce the stress concentration phenomenon on the side surface of the blade fastening clamp block while screwing in the clamp block fastening bolt, helping to improve the clamping effect of the blade fastening clamp block on the blade, and thus enhancing the test accuracy during the vibration fatigue process.

[0121] In the present invention, a spherical rotation structure is adopted. Through the concave spherical surface structure of the matching clamping base, the spherical rotation chuck can rotate at any angle. The slide fastening bolt and the fastening slide cooperate with each other to fix the connecting ball head in the spherical rotation chuck, and the clamping angle of the blade can be adjusted within any angle according to the rotation of the connecting ball head, which improves the selection range of the blade clamping angle during the blade vibration fatigue test. In the blade fastening clamp block part, a detachable assembly is adopted, and different types of blades are equipped with different-shaped blade fastening clamp blocks, thus achieving the design purpose of making the clamping devices for different types of blades mutually universal, and improving the universality of the device for clamping different types of blades during use.

[0122] The vibration fatigue test fixture and its use method described in the present invention can achieve the invention purpose of clamping the blade at any angle during the vibration fatigue test, and are applicable to studying the vibration response problems of different types of blades under excitation. It is convenient to clamp the turbine blade to be tested, has a simple structure, and can be directly used on a common type of vibration test bench. At the same time, the clamping devices for different types of blades are made mutually universal, and the blade can be clamped at any angle, so as to obtain the characteristics of the vibration response of the turbine blade under different excitation directions during the vibration test. The operation is simple during the test, and the device has high reliability, so as to obtain the characteristics of the vibration response of the turbine blade under different excitation directions during the vibration test, making up for the gaps and deficiencies in the prior art.

[0123] The above-mentioned embodiments are only the second of the implementation manners capable of implementing the technical solution of the present invention. The scope of protection required by the present invention is not limited only by the above-mentioned embodiments, but also includes any changes, substitutions and other implementation manners that are easily conceivable by any person skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A vibration fatigue test fixture for a turbine blade, characterized in that, It includes a clamping base (1), a spherical rotating chuck (4) and a blade fastening clamp block (5); a spherical clamping space is provided at the upper end of the clamping base (1), one end of the spherical rotating chuck (4) is rotatably arranged in the spherical clamping space, and the other end of the spherical rotating chuck (4) is cooperatively connected with the tenon of the turbine blade (7) to be tested; The spherical rotating chuck (4) includes a connecting ball head (41), a chuck connecting rod (42) and a U-shaped clamping groove (43); the connecting ball head (41) is rotatably arranged in the spherical clamping space; the first end of the chuck connecting rod (42) is fixedly connected with the connecting ball head (41), and the second end of the chuck connecting rod (42) is connected with the U-shaped clamping groove (43); the blade fastening clamp block (5) is arranged at the opening end of the U-shaped clamping groove (43) and is used for cooperatively connecting with the tenon of the turbine blade (7) to be tested; The blade fastening clamp block (5) includes a first clamp block (51) and a second clamp block (52); the first clamp block (51) and the second clamp block (52) are symmetrically and spaced apart at the opening end of the U-shaped clamping groove (43), and a specimen clamping space is provided between the first clamp block (51) and the second clamp block (52); the tenon of the turbine blade (7) to be tested is cooperatively fixed in the specimen clamping space; The U-shaped clamping groove (43) includes a fixing plate, a first baffle and a second baffle; the fixing plate is vertically fixed at the end of the second end of the chuck connecting rod (42), the first baffle is vertically fixed at one end of the fixing plate, and the second baffle is vertically fixed at the other end of the fixing plate; The first clamp block (51) and the second clamp block (52) are symmetrically arranged on the fixing plate. One side of the first clamp block (51) is connected to the first baffle through a clamp block fastening bolt (6), and a first tenon tooth is arranged on the other side of the first clamp block (51); wherein, the first tenon tooth is meshed and fixed with one side surface of the tenon of the turbine blade (7) to be tested; One side of the second clamp block (52) is connected to the second baffle through another clamp block fastening bolt (6), and a second tenon tooth is arranged on the other side of the second clamp block (52); wherein, the second tenon tooth is meshed and fixed with the other side surface of the tenon of the turbine blade (7) to be tested; It also includes a fastening slide plate (2) and a slide plate fastening bolt (3); a concave spherical surface is provided at the center of the upper end surface of the clamping base (1), and the opening of the concave spherical surface is upward; A fixed clamping part (13) extends upward on one side of the upper end surface of the clamping base (1), and a slide plate fixing part (14) extends upward on the other side of the upper end surface of the clamping base (1); wherein, the fixed clamping part (13) is located on the circumferential side of the concave spherical surface, and the slide plate fixing part (14) is located on the circumferential side of the concave spherical surface on the other side; The fastening slide plate (2) is horizontally slidably arranged above the upper end surface of the clamping base (1) and is located between the slide plate fixing part (14) and the concave spherical surface; the slide plate fastening bolt (3) is horizontally arranged between the slide plate fixing part (14) and the fastening slide plate (2); wherein, one end of the slide plate fastening bolt (3) is connected to the fastening slide plate (2), and the other end of the slide plate fastening bolt (3) is connected to the slide plate fixing part (14); the fastening slide plate (2), the concave spherical surface and the fixed clamping part (13) enclose a spherical clamping space; The fixed clamping part (13) includes a V-shaped fixed block (131) and two claw-shaped fixed blocks (132); The V-shaped fixed block (131) is vertically arranged on the upper end surface of the clamping base (1), and the V-shaped fixed block (131) includes a first fixed block and a second fixed block which are symmetrically arranged; wherein, the horizontal included angle between the first fixed block and the second fixed block is greater than 90°; The two claw-shaped fixed blocks (132) are symmetrically arranged on the upper end surface of the clamping base (1) and are respectively arranged at both ends of the V-shaped fixed block (131); one of the claw-shaped fixed blocks is arranged at an interval at the end of the first fixed block, and the other claw-shaped fixed block is arranged at an interval at the end of the second fixed block; The inner surfaces of the first fixed block and the second fixed block are both arranged as spherical concave surfaces, and the spherical concave surfaces are in close contact with the outer surface of the connecting ball head (41); the inner surface of the claw-shaped fixed block (132) is arranged as a spherical arc surface, and the spherical arc surface is in close contact with the outer surface of the connecting ball head (41); The slide plate fixing part (14) is located between the two claw-shaped fixed blocks (132); the slide plate fixing part (14) is an arc-shaped plate structure, and the arc-shaped plate structure is vertically arranged at the edge of the upper end surface of the clamping base (1) and is arranged opposite to the V-shaped fixed block (131); A fastening bolt hole (141) is arranged at the center of the arc-shaped plate structure, and the slide plate fastening bolt (3) is horizontally arranged in the fastening bolt hole (141); wherein, the first end of the slide plate fastening bolt (3) is fixedly connected to the fastening slide plate (2), and the second end of the slide plate fastening bolt (3) extends to the outside of the outer side surface of the slide plate fixing part (14); A plurality of track grooves (111) are formed above the upper end surface of the clamping base (1), and the plurality of track grooves (111) are horizontally and parallelly arranged between the slide plate fixing part (14) and the concave spherical surface; The fastening slide plate (2) includes a fastening plate body and a plurality of sliders; the plurality of sliders are uniformly arranged at the lower end of the inner concave arc-shaped plate; the upper end of the slider is fixedly connected to the lower end of the fastening plate body, and the lower end of the slider is cooperatively arranged in the track groove (111); the fastening plate body is an inner concave arc-shaped plate, and the inner side surface of the inner concave arc-shaped plate is in close contact with the outer surface of the connecting ball head (41).

2. The vibration fatigue test fixture for a turbine blade according to claim 1, wherein The fixed clamping part (13) includes a V-shaped fixed block (131); The V-shaped fixing block (131) is vertically arranged on the upper end surface of the clamping base (1). The V-shaped fixing block (131) includes a first fixing block and a second fixing block which are symmetrically arranged. Among them, the horizontal included angle between the first fixing block and the second fixing block is 90°. The inner surfaces of the first fixing block and the second fixing block are both arranged as spherical concave surfaces, and the spherical concave surfaces are tightly attached to the outer surface of the connecting ball head (41). The number of the slide plate fixing parts (14) is two. Among them, both of the two slide plate fixing parts (14) are arc-shaped plate structures. The two arc-shaped plate structures are symmetrically arranged at the edge of the upper end surface of the clamping base (1). One of the arc-shaped plate structures is arranged opposite to the first fixing block, and the other arc-shaped plate structure is arranged opposite to the second fixing block. The number of the fastening slide plates (2) is two. One of the fastening slide plates is horizontally slidably arranged between one of the arc-shaped plate structures and the inner concave spherical surface, and the other fastening slide plate is horizontally slidably arranged between the other arc-shaped plate structure and the inner concave spherical surface. Among them, a fastening bolt hole (141) is arranged at the center of the arc-shaped plate structure, and the slide plate fastening bolt (3) is horizontally penetrated in the fastening bolt hole (141). Among them, the first end of the slide plate fastening bolt (3) is fixedly connected to the fastening slide plate (2), and the second end of the slide plate fastening bolt (3) extends to the outer side of the outer side surface of the slide plate fixing part (14).

3. The usage method of a vibration fatigue test fixture for a turbine blade according to any one of claims 1-2, characterized in that, It includes the following steps: Fix the clamping base (1) on the vibration test bench. Connect the tenon of the turbine blade (7) to be tested with the blade fastening clamp block (5). Fit the connecting ball head (41) into the spherical clamping space to install and clamp the spherical rotating chuck (4) with the turbine blade (7) to be tested on the clamping base (1). Adjust the direction of the connecting ball head (41) in the spherical clamping space so that the direction of the turbine blade to be tested matches the vibration excitation direction in the turbine blade vibration test. Thus, the clamping and fixing of the turbine blade (7) to be tested are completed.

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