Tension-torsion strip fatigue test device

Abstract

The utility model relates to a tension and torsion bar fatigue test device, belongs to the technical field of aerospace, and solves the problem that the fatigue life test of a tension and torsion bar under the periodic action of centrifugal force and torsion force cannot be simultaneously realized in the prior art. The test bench comprises a test bench and a force driving module. The test bed is used for supporting the driving module; the force driving module comprises a torsion angle loading assembly and a centrifugal force loading assembly; and the torsion angle loading assembly and the centrifugal force loading assembly can be used for loading and testing a tested piece at the same time. According to the utility model, the fatigue test under the torsion angle and centrifugal force loading effect of the tension-torsion strip can be realized at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to aerospace technology field especially relates to a pull twist strip fatigue test device. BACKGROUND

[0002] The pull twist strip of helicopter rotor system is the key component of the helicopter blade, and can realize the pitch change of the blade to adjust the attitude of the helicopter. However, due to the high-frequency rotation of the helicopter rotor system, the stress condition of the component is relatively complex. In order to ensure the reliability of the system, the life of the measured piece 3 under the action of centrifugal force and torsional force needs to be tested at the same time.

[0003] The prior art only realizes the fatigue test of the fixed axial force and single torsional amplitude of the pull twist strip, and cannot simultaneously realize the fatigue life test of the pull twist strip under the periodic action of centrifugal force and torsional force. UTILITY MODEL CONTENT

[0004] In view of the above analysis, the utility model embodiment aims to provide a pull twist strip fatigue test device to solve the problem that the prior art cannot simultaneously realize the fatigue life test of the pull twist strip under the periodic action of centrifugal force and torsional force.

[0005] The purpose of the utility model is mainly realized through the following technical schemes:

[0006] A pull twist strip fatigue test device, comprising a test bench and a force driving module;

[0007] The test bench is used for supporting the force driving module;

[0008] The force driving module comprises a torsional angle loading assembly and a centrifugal force loading assembly;

[0009] The measured pieces are connected in series, the torsional angle loading assembly is arranged between the measured pieces, the torsional angle test is realized by loading the torsional angle load between the measured pieces, and the centrifugal force loading assembly is arranged at one end of the measured pieces, the centrifugal force loading test is realized by loading the pulling force load at one end of the measured pieces;

[0010] The torsional angle loading assembly and the centrifugal force loading assembly can simultaneously load and test the measured pieces.

[0011] Further, the torsional angle loading assembly comprises a first actuating cylinder, a torsional angle rod and a torsional shaft;

[0012] The torsional shaft is arranged between the measured pieces, and the torsional angle rod is arranged vertically at the middle of the torsional shaft; the loading end of the first actuating cylinder drives the torsional shaft to rotate through the torsional angle rod;

[0013] The first actuating cylinder loads the torsional angle of the measured pieces through the torsional angle rod and the torsional shaft.

[0014] Further, the centrifugal force loading assembly comprises a second actuator and a cable;

[0015] One end of the cable is arranged on the second actuator, and the other end of the cable is arranged on the measured member;

[0016] The second actuator loads the measured member with a pulling force through the cable.

[0017] Further, the centrifugal force loading assembly further comprises a lever; the lever is used for amplifying the pulling force of the second actuator; and the second actuator and the cable are arranged on two sides of the lever respectively.

[0018] Further, the bottom of the lever is fixed, the end of the second actuator is connected with the top end of the lever, and the cable is connected with the lever.

[0019] Further, a lever adapter shaft is arranged on the lever, and the cable is arranged on the end of the lever adapter shaft.

[0020] Further, the centrifugal force loading assembly further comprises a stretching rod and a rotation-restricting support; the stretching rod is arranged on the rotation-restricting support; one end of the stretching rod is connected with the cable, and the other end of the stretching rod is connected with the measured member.

[0021] Further, the torsion angle loading assembly further comprises a torsion support, a connecting pin is arranged on the torsion support, and the first actuator is connected with the connecting pin.

[0022] Further, the torsion shaft is arranged between the measured members.

[0023] Further, the torsion angle rod is arranged at the lower part of the torsion support, and the end of the torsion angle rod is connected with the torsion shaft.

[0024] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0025] (1) Compared with the prior art, the tensile-torsional bar fatigue test device of the present application comprises a torsion angle loading and a centrifugal force loading, the measured members are arranged in series, the torsion angle loading assembly is arranged between the measured members, the torsion angle test is realized by loading the torsion angle load between the measured members, the centrifugal force loading assembly is arranged at one end of the measured member, the centrifugal force loading test is realized by loading the pulling load at one end of the measured member, the present application can simultaneously test multiple measured members, and can simultaneously realize the fatigue life test of the torsion angle loading and the centrifugal force loading of the tensile-torsional bar of the measured member, so as to more accurately evaluate the fatigue life of the measured member under the real working condition, and improve the test efficiency.

[0026] (2) The torsion angle loading assembly of the utility model uses a first actuating cylinder, a torsion angle rod and a torsion shaft, the first actuating cylinder loads the measured member by torsion through the torsion angle rod and the torsion shaft; the centrifugal force loading assembly comprises a second actuating cylinder and a cable, the second actuating cylinder loads the measured member by tension through the cable; the loading range and frequency of the first actuating cylinder and the second actuating cylinder are adjustable, and dynamic loading and high load loading can be realized, thereby improving the stability of the test.

[0027] (3) The centrifugal force loading of the utility model uses a lever to amplify the tension of the second actuating cylinder. The second actuating cylinder and the cable are arranged on the two sides of the lever. The force point of the second actuating cylinder is the top end of the lever, and the force point of the cable is any position from the bottom to the top of the lever, so that the tension of the second actuating cylinder is amplified to the required multiple. One end of the cable is connected with the lever through a lever adapter shaft, and the other end of the cable is connected with the measured member through a stretching rod.

[0028] (4) The pull-torsion strip fatigue test device provided by the utility model simultaneously tests two measured members. The torsion angle loading test is loaded and tested through the torsion angle rod and the torsion shaft arranged between the two measured members, the structure is simple and convenient, and the two measured members are simultaneously loaded and tested by the torsion angle loading test and the centrifugal force loading test, thereby improving the test efficiency.

[0029] In the utility model, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the utility model will be described in the following content, and some advantages can become apparent from the description or can be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the content specially pointed out in the text and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings are only used for the purpose of showing the specific embodiments and are not considered as limiting the utility model, and the same reference signs represent the same parts in the whole drawings.

[0031] Figure 1 It is a structural schematic view of the pull-torsion strip fatigue test device of the specific embodiment;

[0032] Figure 2 It is a structural schematic view of the test table of the specific embodiment;

[0033] Figure 3 It is a structural schematic view of the force driving module;

[0034] Figure 4 It is a structural schematic view of the torsion angle loading assembly;

[0035] Figure 5 It is a local enlarged structural schematic view of the torsion angle loading part;

[0036] Figure 6 Structure diagram of centrifugal force loading assembly.

[0037] Reference signs:

[0038] 1-test bench, 11-platform, 12-column, 121-first column, 122-second column, 13-crossbeam, 131-first crossbeam, 132-second crossbeam, 14-fixed beam, 2-force driving module, 21-first actuator, 211-first actuator support, 22-second actuator, 221-second actuator support, 23-lever, 231-lever fixed support, 232-rotation shaft, 233-lever adapter shaft, 24-tension cable, 25-tension rod, 26-torsion shaft, 261-torsion shaft support, 262-needle bearing, 27-torsion support, 271-connection pin, 28-torsion angle rod, 29-rotation constraint support, 3-measured piece, 31-paddle hub connection pin. DETAILED DESCRIPTION

[0039] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, wherein the drawings constitute a part of the utility model, and are used together with the embodiments of the utility model to explain the principles of the utility model, and are not used to limit the scope of the utility model.

[0040] One specific embodiment of the utility model, as shown in Figure 1 , discloses a kind of tension-torsion bar fatigue test device, including test bench 1 and force driving module 2.

[0041] As shown in Figure 2 , test bench 1 is used to support force driving module 2, including platform 11, column 12, crossbeam 13 and fixed beam 14.Platform 11 is used to install and fix column 12, crossbeam 13 and fixed beam 14.Column 12, crossbeam 13 and fixed beam 14 are used to install force driving module 2.

[0042] Column 12 is arranged at both sides of platform 11.Column 12 includes first column 121 and second column 122, and is used to install two sets of force driving module 2 respectively.First column 121 is provided with first crossbeam 131, and fixed beam 14 is arranged at the opposite side of first crossbeam 131.Second column 122 is provided with second crossbeam 132 in parallel at the corresponding position.

[0043] As shown in Figure 3 , force driving module 2 includes torsion angle loading assembly and centrifugal force loading assembly, and torsion angle loading assembly and centrifugal force loading assembly can simultaneously load test to measured piece 3.

[0044] The tension-torsion strip fatigue test device in the embodiment can test two measured pieces 3, and the two measured pieces 3 are arranged in series during the test. One end of the two measured pieces 3 is fixed to the first stand 121, and the other end is provided with a centrifugal force loading assembly. The middle of the two measured pieces 3 is provided with a torsion angle loading assembly.

[0045] The torsion angle loading assembly can simultaneously load the two measured pieces 3 with a torsion angle. As shown in Figure 4 , the torsion angle loading assembly includes a first actuator cylinder 21, a torsion angle rod 28, and a torsion shaft 26. The first actuator cylinder 21 loads the measured piece 3 with a torsion angle through the torsion angle rod 28 and the torsion shaft 26.

[0046] The first actuator cylinder 21 is arranged on a first actuator cylinder support 211 of the fixed beam 14. Exemplarily, the first actuator cylinder 21 is hinged to the first actuator cylinder support 211. A force sensor is arranged on the first actuator cylinder 21 to monitor the size of the torsion force.

[0047] Further, as shown in Figure 5 , the torsion angle loading assembly further includes a torsion support 27, and the end of the first actuator cylinder 21 is connected to the torsion support 27 through a connecting pin 271. The torsion angle rod 28 is arranged at the lower part of the torsion support 27, and the end thereof is connected to the torsion shaft 26.

[0048] The torsion shaft support 261 is arranged between the two measured pieces 3. The needle bearing 262 is arranged at the side of the torsion shaft support 261, and the measured piece 3 releases the degree of freedom in the direction of the centrifugal force through the needle bearing 262.

[0049] As shown in Figure 6 , the centrifugal force loading assembly includes a second actuator cylinder 22 and a cable 24. The second actuator cylinder 22 loads the measured piece 3 with a tension force through the cable 24.

[0050] The second actuator cylinder 22 is installed on a second actuator cylinder support 221 arranged on one side of the second stand 122. Exemplarily, the second actuator cylinder 22 is hinged to the second actuator cylinder support 221. A force sensor is arranged on the second actuator cylinder 22 to monitor the size of the centrifugal force.

[0051] Further, a lever 23 is also included. The lever 23 is arranged on a lever fixing support 231 on the second cross beam 132. Exemplarily, the lever 23 is hinged on the lever fixing support 231. The lever 23 is used to realize force amplification of the second actuating cylinder 22, and the bottom thereof is fixed. The second actuating cylinder 22 and the cable 24 are arranged on two sides of the lever 23 respectively. The loading end of the second actuating cylinder 22 is connected with the top end of the lever 23, and the cable 24 is arranged on a lever adapter shaft 233 on the lever 23, the lever adapter shaft 233 is screwed on a rotating shaft 232, and the rotating shaft 232 and the lever adapter shaft 233 are arranged at a specific position on the lever 23 according to the required amplification multiple of the force. For example, when the force needs to be amplified to 2 times, the rotating shaft 232 and the lever adapter shaft 233 are arranged at the middle of the lever 23, and the cable 24 is connected with the lever adapter shaft 233.

[0052] The centrifugal force loading of the embodiment uses the lever 23 to amplify the pulling force of the second actuating cylinder 22. The second actuating cylinder 22 and the cable 24 are arranged on two sides of the lever 23. The force application point of the second actuating cylinder 22 is located at the top end of the lever 23, and the force application point of the cable 24 is any position from the bottom to the top of the lever 23, so as to amplify the pulling force of the second actuating cylinder 22 to the required multiple. One end of the cable 24 is connected with the lever 23 through the lever adapter shaft 233, and the other end of the cable 24 is connected with the measured member 3 through the stretching rod 25.

[0053] Exemplarily, the rotating shaft 232 and the lever adapter shaft 233 are arranged at the middle of the lever 23 in the embodiment. Correspondingly, the pulling force of the second actuating cylinder 22 is amplified to 2 times.

[0054] Further, the stretching rod 25 and the rotation constraint support 29 are also arranged. The stretching rod 25 is arranged on the rotation constraint support 29; one end of the stretching rod 25 is connected with the cable 24, and the other end thereof is connected with the measured member 3. When the cable 24 pulls the stretching rod 25, the rotation constraint support 29 restricts the rotation of the stretching rod 25, so that the pulling force of the cable 24 is directly transmitted to the measured member 3 through the stretching rod 25. Exemplarily, the stretching rod 25 is a non-rotating body with equal cross section, for example, an equal cross section body with an elliptical cross section, and the rotation constraint support 29 is provided with a through hole with the same shape and size as the cross section of the stretching rod 25.

[0055] The second actuating cylinder 22 loads the amplified stretching force on the lever adapter shaft 233 through the lever 23 structure, and the stretching load is applied to the measured member 3 through the cable 24 and the stretching rod 25.

[0056] The two measured members 3 are arranged on two sides of the torsion shaft support 261 through the hub connecting pin 31. One end of the measured member 3 is arranged on the first stand column 121 and is restricted in all degrees of freedom, and the other end thereof is arranged on the cable 24 and is restricted in the torsion degree of freedom.

[0057] The torsional force generated by the first actuator 21 acts between the two test pieces 3, so that the two test pieces 3 are twisted simultaneously. The tensile force generated by the second actuator 22 is amplified by the lever 23 and acts on the test piece 3 through the tensile cable 24. The test load and frequency can be controlled by controlling the force and displacement of the first actuator 21 and the second actuator 22.

[0058] The use method of the embodiment is as follows:

[0059] The test piece 3 is installed, and whether the two test pieces 3 are on the same axis and the horizontal angle of the test piece 3 is determined by using the level and the angle ruler.

[0060] The strain gauges are pasted on the upper and lower surfaces of the test piece 3, and the installation is adjusted by the strain difference of the upper and lower surfaces. The loading end of the first actuator 21 is connected to the torsional support 27 through the connecting pin 271, so as to realize the loading of the torsional load of the test piece 3. The second actuator 22 loads the tensile force on the lever adapter shaft 233 after amplification by the lever 23, and then loads the tensile load on the test piece 3 through the tensile cable 24 and the tensile rod 25. By controlling the size and frequency of the load of the two actuators, the fatigue characteristics or fatigue life of the test piece 3 can be tested, and finally the fatigue characteristics and fatigue life of the test piece 3 can be obtained.

[0061] The embodiment uses two actuators as driving devices to provide tensile and torsional forces respectively. The tensile force can be amplified by the lever 23 structure to broaden the loading load range. The needle bearing 262 is used to release the restriction in the centrifugal force direction. The loading displacement and frequency of the actuator are controlled to realize the fatigue test of the test piece 3 under the action of tensile and torsional loads.

[0062] Compared with the prior art, the tensile and torsional fatigue test device of the embodiment includes a torsional angle loading and a centrifugal force loading, and can simultaneously realize the fatigue life test of the test piece 3 under the action of the torsional angle loading and the centrifugal force loading, so as to more accurately evaluate the fatigue life of the test piece 3 under the real working condition and improve the test efficiency.

[0063] The torsional angle loading assembly of the embodiment uses the first actuator 21, the torsional angle rod 28 and the torsional shaft support 261. The first actuator 21 loads the test piece 3 by the torsional angle rod 28 and the torsional shaft support 261. The centrifugal force loading assembly includes the second actuator 22 and the tensile cable 24. The second actuator 22 loads the test piece 3 by the tensile cable 24. The loading range and frequency of the first actuator 21 and the second actuator 22 are adjustable, and dynamic loading and high load loading can be realized to improve the stability of the test.

[0064] The embodiment can simultaneously test two measured members 3, and the torsion angle loading test is loaded by the torsion angle rod 28 and the torsion shaft support 261 arranged between the two measured members 3, so that the structure is simple and convenient, and the torsion angle loading test and the centrifugal force loading test are simultaneously performed on the two measured members 3, and the test efficiency is improved.

[0065] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A tension-torsion strip fatigue testing device, characterized by comprising: The test bench (1) and the force driving module (2) are included. The test bench (1) is used for supporting the force driving module (2). The force driving module (2) includes a torsion angle loading assembly and a centrifugal force loading assembly. The measured members (3) are arranged in series, the torsion angle loading assembly is arranged between the measured members (3), and the torsion angle test is realized by loading the torsion angle load between the measured members (3); the centrifugal force loading assembly is arranged at one end of the measured members (3), and the centrifugal force loading test is realized by loading the tension load at one end of the measured members (3). The torsion angle loading assembly and the centrifugal force loading assembly can simultaneously load and test the measured members (3).

2. The pull-torsion strip fatigue testing device according to claim 1, characterized in that The torsion angle loading assembly includes a first actuator cylinder (21), a torsion angle rod (28) and a torsion shaft (26). The torsion shaft (26) is arranged between the measured members (3), the torsion angle rod (28) is connected to the torsion shaft (26), and the loading end of the first actuator cylinder (21) drives the torsion shaft (26) to rotate through the torsion angle rod. The first actuator cylinder (21) loads the measured members (3) through the torsion angle rod (28) and the torsion shaft (26).

3. The pull-torsion strip fatigue testing apparatus according to claim 1, characterized by The centrifugal force loading assembly includes a second actuator cylinder (22) and a cable (24). One end of the cable (24) is arranged in the second actuator cylinder (22), and the other end of the cable (24) is arranged in the measured members (3). The second actuator cylinder (22) loads the measured members (3) through the cable (24).

4. The pull-torsion strip fatigue testing device according to claim 3, characterized in that The centrifugal force loading assembly further includes a lever (23); the lever (23) is used for amplifying the tension of the second actuator cylinder (22); the second actuator cylinder (22) and the cable (24) are arranged on both sides of the lever (23) respectively.

5. The pull-torsion strip fatigue testing device according to claim 4, characterized in that The bottom of the lever (23) is fixed, the end of the second actuator cylinder (22) is connected to the top end of the lever (23), and the cable (24) is connected to the lever (23).

6. The pull-torsion strip fatigue testing device according to claim 5, characterized in that The lever (23) is provided with a lever adapter shaft (233), and the cable (24) is arranged at the end of the lever adapter shaft (233).

7. The pull-torsion strip fatigue testing device according to claim 3, wherein The centrifugal force loading assembly further includes a stretching rod (25) and a rotation constraint support (29); the stretching rod (25) is arranged on the rotation constraint support (29); one end of the stretching rod (25) is connected to the cable (24), and the other end of the stretching rod (25) is connected to the measured members (3).

8. The pull-torsion strip fatigue testing device according to claim 2, wherein The torsion angle loading assembly further includes a torsion support (27), and the first actuator cylinder (21) is connected to a connecting pin (271) arranged on the torsion support (27).

9. The pull-torsion strip fatigue testing apparatus according to claim 8, wherein The torsion shaft (26) is arranged between the measured members (3).

10. The pull-torsion strip fatigue testing apparatus according to claim 9, wherein The torsion angle rod (28) is arranged at the lower part of the torsion support (27), and the end of the torsion angle rod (28) is connected to the torsion shaft (26).

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