Rigidity testing device

Abstract

The utility model discloses a rigidity test device, which comprises a main body assembly and a test base, a test main body frame is fixedly connected onto the test base, and the upper side of the test base is fixedly connected with a support unit used for connecting a piece to be tested; the test assembly comprises a first linear driver and a second linear driver, the first linear driver is connected to one end of the test main body frame in the front-back direction, the second linear driver is connected to the upper end of the test main body frame, the first linear driver is connected with a first push-pull rod which does reciprocating linear motion in the front-back direction, and the second linear driver is connected with a second push-pull rod which does reciprocating linear motion in the front-back direction; the second linear driver is connected with a second push-pull rod which does reciprocating linear motion in the height direction, the outwards-extending end of the first push-pull rod is connected with the blade, the downwards-extending end of the second push-pull rod is connected with the blade, and the outer edge of the tail end of the blade is fixedly connected with at least one displacement sensor. The device is simple in structure, and can assist in testing the shimmy rigidity and the flapping rigidity of the large blade.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, and in particular to a stiffness testing device. Background Technology

[0002] Carbon fiber composites are increasingly widely used in the aerospace field due to their high modulus, low density, high strength, good high-temperature performance, and good formability. Currently, carbon fiber composites are widely used in blades, and to ensure blade strength, mechanical property tests are required. However, existing testing fixtures cannot perform stiffness tests on large blades, necessitating a stiffness testing device to solve the technical problem of not being able to conduct stiffness tests. Utility Model Content

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0004] In view of the above and / or existing problems in the stiffness testing of large blades, this utility model is proposed.

[0005] Therefore, the purpose of this invention is to provide a stiffness testing device that can assist in testing the oscillation stiffness and flapping stiffness of blades.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a stiffness testing device, comprising,

[0007] The main component includes a test base, on which a test main frame is fixedly connected.

[0008] A support unit for connecting the test piece is fixedly connected to the upper side of the test base;

[0009] The test assembly includes a first linear driver and a second linear driver, wherein the first linear driver...

[0010] The first linear actuator is connected to one end of the test frame in the front-to-back direction, and the second linear actuator is connected to the upper end of the test frame. The first linear actuator is connected to a first push-pull rod that makes reciprocating linear motion in the front-to-back direction, and the second linear actuator is connected to a second push-pull rod that makes reciprocating linear motion in the height direction. The outward end of the first push-pull rod is connected to the blade, and the downward end of the second push-pull rod is connected to the blade. At least one displacement sensor is fixedly connected to the outer edge of the blade tip.

[0011] As a preferred embodiment of the stiffness testing device of this utility model, the blade has several adhesive tapes bonded to its outer edge. The adhesive tapes are arranged in a straight line along the axial direction of the blade. Each adhesive tape has two spaced holes. The adhesive tapes are inserted into the first steel sleeve and the second steel sleeve through the two holes respectively. The outwardly extending end of the first push-pull rod is connected to the first steel sleeve, and the downwardly extending end of the second push-pull rod is connected to the second steel sleeve.

[0012] As a preferred embodiment of the stiffness testing device of this utility model, wherein: a first horizontal lever is fitted on the first steel sleeve, and a first horizontal connecting beam is fixedly connected to the forward-extending end of two adjacent first horizontal levers, each pair of adjacent first horizontal connecting beams forms a group, and a forward-extending second horizontal lever is connected to each group of first horizontal connecting beams, the forward-extending end of the second horizontal lever on two adjacent groups of first horizontal connecting beams is connected to a second horizontal connecting beam, a forward-extending third horizontal lever is connected to the second horizontal connecting beam, the forward-extending end of several third horizontal levers is connected to a third horizontal connecting beam, and the outward-extending end of the first push-pull rod is fixedly connected to the third horizontal connecting beam.

[0013] As a preferred embodiment of the stiffness testing device of this utility model, the second steel sleeve is fitted with a first vertical lever, and the upper ends of two adjacent first vertical levers are fixedly connected to a first crossbeam. Each pair of adjacent first crossbeams forms a group, and a second vertical lever is connected to the first crossbeam. The upper end of the second vertical lever on each group of first crossbeams is connected to a second crossbeam, and a third vertical lever is connected to the second crossbeam. The upper ends of several third vertical levers are connected to a third crossbeam, and the lower end of the second push-pull rod is connected to the third crossbeam.

[0014] As a preferred embodiment of the stiffness testing device of this utility model, the support unit includes a fixed seat and a support seat to the right of the fixed seat. The support ring of the blade is supported in the support seat, and the blade root joint is supported on the fixed seat. Two anti-twist blocks that are spaced apart in the front-rear direction are fixedly connected on the fixed seat to prevent the blade from twisting. The blade root joint is locked between the two anti-twist blocks.

[0015] Compared with the prior art, this utility model has the following technical advantages: simple structure and convenient installation; it can realize the testing of flapping stiffness and oscillation stiffness of large blades. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is the front view of the present invention.

[0018] Figure 2 The three-dimensional structure of this utility model Figure 1 .

[0019] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0020] Figure 4 The three-dimensional structure of this utility model Figure 2 .

[0021] Figure 5 for Figure 4 A magnified view of a section at point B.

[0022] Figure 6 The three-dimensional structure of this utility model Figure 3 .

[0023] Figure 7 for Figure 6 A magnified view of a section at point C.

[0024] In the diagram: 100 Main component, 101 Bracket, 102 Test main frame, 103 Test base, 104 Support unit, 1041 Support seat, 1042 Fixing seat, 105 Anti-torsion block, 200 Blade, 300 Test component, 301 First linear actuator, 302 Second linear actuator, 303 Second push-pull rod, 304 Displacement sensor, 305 First push-pull rod, 306 First horizontal lever, 307 Adhesive tape, 308 First vertical lever, 309 First crossbeam, 310 Second vertical lever, 311 Second crossbeam, 312 Third vertical lever, 313 Third crossbeam, 314 First steel sleeve, 315 Second steel sleeve, 316 Horizontal connecting rod, 317 Second horizontal connecting beam, 318 First horizontal connecting beam, 319 Vertical connecting rod. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0028] Example 1

[0029] Reference Figure 1 , Figure 4 , Figure 6 and Figure 7 This is the first embodiment of the present invention, which provides a stiffness testing device that can assist in completing stiffness tests on large blades.

[0030] A stiffness testing device includes a main body assembly 100, which includes a test base 103. A test main frame 102 and a support 101 are connected to the test base 103 at intervals in the left and right directions. A support unit 104 for connecting the test piece is fixedly connected to the upper side of the test base 103. A test component 300 for testing the stiffness of a large blade 200 is connected to the test main frame 102.

[0031] Specifically, the test assembly 300 includes a first linear actuator 301 and a second linear actuator 302. Both the first linear actuator 301 and the second linear actuator 302 are preferably hydraulic cylinders. The first linear actuator 301 is connected to one end of the test main frame 102 in the front-rear direction, and the second linear actuator 302 is connected to the upper end of the test main frame 102. A first push-pull rod 305 that makes reciprocating linear motion in the front-rear direction is connected to the first linear actuator 301, and a second push-pull rod 303 that makes reciprocating linear motion in the height direction is connected to the second linear actuator 302. One end of the first push-pull rod 305 that extends outward is connected to the blade 200, and one end of the second push-pull rod 303 that extends downward is connected to the blade 200. At least one displacement sensor 304 (only a simplified illustration in the figure) is fixedly connected to the outer edge of the blade 200. In this application, two displacement sensors 304 are provided. The displacement sensors 304 are pull-rope type displacement sensors 304, and the other end of the displacement sensors 304 is fixedly connected to the bracket 101.

[0032] During the test, the first linear actuator 301 is controlled to move, causing the first push-pull rod 305 to stretch upward. The displacement sensor 304 detects the deformation of the blade 200, thus achieving the test of the flapping stiffness of the blade 200. After the first test, the system is reset and prepared for the next test until the set flapping stiffness test operation is completed. The second linear actuator 302 is controlled to move, causing the second push-pull rod 303 to retract. The displacement sensor 304 detects the deformation of the blade 200, thus achieving the test of the oscillation stiffness of the blade 200. The system is then reset and the next test is performed until the set oscillation stiffness test operation is completed.

[0033] Specifically, the support unit 104 includes a fixed base 1042 and a support base 1041 to the right of the fixed base 1042. The support ring of the blade 200 is supported in the support base 1041, and the blade root connector of the blade 200 is supported on the fixed base 1042. Two anti-twist blocks 105, which are spaced apart in the front-rear direction to prevent the blade 200 from twisting, are fixedly connected to the fixed base 1042. The blade root connector is locked between the two anti-twist blocks 105.

[0034] During installation, the blade root connector is passed through the through hole on the support base 1041 and the support hole on the fixed base 1042 and then supported on the fixed base 1042. At the same time, it is locked between the anti-twist blocks 105 to prevent the blade 200 from twisting, thereby improving the accuracy of the blade 200 test. The support ring of the blade 200 is supported on the support base 1041, thus realizing the installation of the blade 200. The installation is convenient.

[0035] Example 2

[0036] Reference Figures 1-5 This embodiment provides a stiffness testing device, which differs from Embodiment 1 in that it can further improve the accuracy of the test.

[0037] Specifically, several adhesive tapes 307 are bonded to the outer edge of the blade 200. Two displacement sensors 304 are respectively set on the blade 200 in front of and behind the adhesive tapes 307. The adhesive tapes 307 are arranged in a straight line along the axial direction of the blade 200. The adhesive tapes 307 have two spaced holes. The adhesive tapes 307 are inserted into the first steel sleeve 314 and the second steel sleeve 315 through the two holes respectively. The outwardly extending end of the first push-pull rod 305 is connected to the first steel sleeve 314, and the downwardly extending end of the second push-pull rod 303 is connected to the second steel sleeve 315.

[0038] Specifically, a first horizontal lever 306 is fitted onto the first steel sleeve 314. A first horizontal connecting beam 318 is fixedly connected to the forward-extending end of two adjacent first horizontal levers 306. Each pair of adjacent first horizontal connecting beams 318 forms a group. A second horizontal lever extending forward is connected to each group of first horizontal connecting beams 318. A second horizontal connecting beam 317 is connected to the forward-extending end of the second horizontal levers on two adjacent groups of first horizontal connecting beams 318. A third horizontal lever extending forward is connected to the second horizontal connecting beam 317. Several third horizontal levers extending forward are connected to third horizontal connecting beams. A horizontal connecting rod 31 is fixedly connected to the outward-extending end of the first push-pull rod 305. 6. The rear end of the horizontal connecting rod 316 is fixedly connected to the third horizontal connecting beam; the second steel sleeve 315 is fitted with a first vertical lever 308, and the upper end of two adjacent first vertical levers 308 is fixedly connected to a first crossbeam 309. Each pair of adjacent first crossbeams 309 forms a group, and a second vertical lever 310 is connected to the first crossbeam 309. The upper end of the second vertical lever 310 on each group of first crossbeams 309 is connected to a second crossbeam 311, and a third vertical lever 312 is connected to the second crossbeam 311. The upper ends of several third vertical levers 312 are connected to a third crossbeam 313, and the lower end of the second push-pull rod 303 is fixedly connected to the third crossbeam 313 via the vertical connecting rod 319.

[0039] After the blade 200 is supported on the fixed base 1042 and the support base 1041, adhesive tape 307 is glued to the outside of the blade 200 according to the set position. The first horizontal lever 306 and the first vertical lever 308 are respectively inserted into the gaps of the corresponding adhesive tape 307. The first steel sleeve 314 and the second steel sleeve 315 are respectively inserted into the collar at the rear end of the first horizontal lever 306 and the collar at the lower end of the first vertical lever 308, realizing the indirect connection between the first push-pull rod 305 and the second push-pull rod 303 and the blade 200, which is convenient. The load can be evenly applied to the blade 200 by the evenly arranged levers, which improves the accuracy of the test.

[0040] The directions mentioned in this application are based on the front view. The direction perpendicular to the paper is the front-back direction, the horizontal direction parallel to the paper is the left-right direction, and the vertical direction parallel to the paper is the height direction.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A stiffness testing device, characterized in that: include, The main component (100) includes a test base (103), on which a test main frame (102) is fixedly connected. A support unit (104) for connecting the test piece is fixedly connected to the upper side of the base; The test assembly (300) includes a first linear driver (301) and a second linear driver (302), wherein the first linear driver (301) A second linear actuator (302) is connected to one end of the test main frame (102) in the front-rear direction. A first linear actuator (301) is connected to a first push-pull rod (305) that makes reciprocating linear motion in the front-rear direction. A second linear actuator (302) is connected to a second push-pull rod (303) that makes reciprocating linear motion in the height direction. The outward end of the first push-pull rod (305) is connected to the blade (200). The downward end of the second push-pull rod (303) is connected to the blade (200). At least one displacement sensor (304) is fixedly connected to the outer edge of the blade (200).

2. The stiffness testing device as described in claim 1, characterized in that: The outer edge of the blade (200) is bonded with several adhesive tapes (307), which are arranged in a straight line along the axial direction of the blade (200). Each adhesive tape (307) has two spaced holes. The adhesive tape (307) is inserted into the first steel sleeve (314) and the second steel sleeve (315) through the two holes respectively. The outward end of the first push-pull rod (305) is connected to the first steel sleeve (314), and the downward end of the second push-pull rod (303) is connected to the second steel sleeve (315).

3. The stiffness testing device as described in claim 2, characterized in that: The first steel sleeve (314) is fitted with a first horizontal lever (306). The forward-extending ends of two adjacent first horizontal levers (306) are fixedly connected to a first horizontal connecting beam (318). Each pair of adjacent first horizontal connecting beams (318) forms a group. Each group of first horizontal connecting beams (318) is connected to a forward-extending second horizontal lever. The forward-extending ends of the second horizontal levers on two adjacent groups of first horizontal connecting beams (318) are connected to a second horizontal connecting beam (317). The forward-extending third horizontal levers are connected to the second horizontal connecting beams (317). The forward-extending ends of several third horizontal levers are connected to third horizontal connecting beams. The outward-extending end of the first push-pull rod (305) is fixedly connected to the third horizontal connecting beam.

4. The stiffness testing device as described in claim 2, characterized in that: The second steel sleeve (315) is fitted with a first vertical lever (308). The upper ends of two adjacent first vertical levers (308) are fixedly connected to a first crossbeam (309). Each pair of adjacent first crossbeams (309) forms a group. A second vertical lever (310) is connected to the first crossbeam (309). The upper end of the second vertical lever (310) on each group of first crossbeams (309) is connected to a second crossbeam (311). A third vertical lever (312) is connected to the second crossbeam (311). The upper ends of several third vertical levers (312) are connected to a third crossbeam (313). The lower end of the second push-pull rod (303) is connected to the third crossbeam (313).

5. The stiffness testing apparatus according to any one of claims 1 to 4, characterized in that: The support unit (104) includes a fixed seat (1042) and a support seat (1041) to the right of the fixed seat (1042). The support ring of the blade (200) is supported in the support seat (1041), and the blade root joint of the blade (200) is supported on the fixed seat (1042). Two anti-twist blocks (105) that are spaced apart in the front-rear direction to prevent the blade (200) from twisting are fixedly connected on the fixed seat (1042). The blade root joint is locked between the two anti-twist blocks (105).

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