Fatigue performance testing device for elastic element

Abstract

The utility model belongs to the technical field of performance testing, and particularly relates to an elastic element fatigue performance testing device which comprises a limiting plate and a movable seat, and an elastic element to be tested is placed on the movable seat. The device further comprises a magnetostrictive rod and an electromagnetic coil, the magnetostrictive rod is axially arranged towards the face, away from the limiting plate, of the movable seat, the electromagnetic coil is located on the side face of the magnetostrictive rod, the axis of the electromagnetic coil and the axis of the magnetostrictive rod are collinear or parallel, and the magnetostrictive rod axially extends under the action of a magnetic field of the electromagnetic coil. And the movable seat is pushed to move towards the direction of the limiting plate. According to the utility model, the high-frequency and high-precision displacement fatigue performance test of the elastic element under micro strokes such as micron or nanoscale can be realized, and the accuracy and effectiveness of the test result can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of performance test, specifically relates to a kind of elastic element fatigue performance testing device. BACKGROUND

[0002] In the occasion needing elastic support or shock absorption, elastic element with certain stiffness and damping characteristics is used to absorb impact and vibration. Since fatigue failure is the main failure mode of elastic element, in order to ensure the reliability of elastic element under long time use, corresponding fatigue performance test needs to be carried out in production and research and development process. But the commonly used fatigue performance testing device generally uses cylinder, hydraulic cylinder and other power mechanism to drive elastic element to compress repeatedly, its test stroke is larger, and the action frequency is low, so it is difficult to realize high-frequency test stroke under micron or nanometer level micro-stroke, so it is difficult to meet the high-frequency fatigue performance test of elastic element under micron or nanometer level micro-stroke. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problem to provide a kind of elastic element fatigue performance testing device, which can realize high-frequency high-precision displacement fatigue performance test of elastic element under micron or nanometer level micro-stroke, and ensure the accuracy and effectiveness of test results.

[0004] The utility model relates to a kind of elastic element fatigue performance testing device, which includes limiting plate and movable seat, the movable seat is used to place the elastic element to be tested;It also includes magnetostrictive rod and electromagnetic coil, the one side of the magnetostrictive rod is axially arranged away from the limiting plate, the electromagnetic coil is located the side of magnetostrictive rod, and the axis of electromagnetic coil is collinear or parallel with the axis of magnetostrictive rod, the magnetostrictive rod is axially elongated under the action of the magnetic field of electromagnetic coil, to push movable seat and move to the direction of limiting plate.

[0005] Further, the number of electromagnetic coils is one, and the magnetostrictive rod is coaxially arranged in the one electromagnetic coil.

[0006] Further, the number of electromagnetic coils is at least two, and the magnetostrictive rod is arranged between the sides of the at least two electromagnetic coils, and the axis of the electromagnetic coil is parallel to the axis of the at least two electromagnetic coils.

[0007] Further, the one side of the movable seat towards the limiting plate is provided with a positioning shaft, and the limiting plate is provided with a guide hole one, and the positioning shaft is arranged in the guide hole one.

[0008] Further, the positioning shaft is arranged on the one side of the movable seat towards the limiting plate, and when the elastic element to be tested is placed on the movable seat, the elastic element to be tested is sleeved on the positioning shaft.

[0009] Furthermore, it also includes a lower fixing plate and an upper fixing plate, which are connected by a fixing rod, and the electromagnetic coil is disposed between the lower fixing plate and the upper fixing plate.

[0010] Furthermore, both the limiting plate and the movable seat are located above the upper fixed plate, and the upper fixed plate has a guide hole two corresponding to the position of the magnetostrictive rod.

[0011] Furthermore, it also includes a support column and a guide column. The support column is set on the lower fixed plate, the guide column passes through the second guide hole and is connected to the side of the movable seat opposite to the limiting plate, and the magnetostrictive rod is set between the support column and the guide column.

[0012] Furthermore, it also includes a lower silicon steel plate and an upper silicon steel plate. The lower silicon steel plate is set on the lower fixed plate, the support column is set on the lower silicon steel plate, and the upper silicon steel plate is set on the upper fixed plate. The upper silicon steel plate has a through hole, and the guide column passes through the through hole and is installed in the guide hole. Both the support column and the guide column are made of silicon steel.

[0013] Furthermore, it also includes a displacement measurement module for measuring the travel distance of the movable seat in the direction of the limiting plate.

[0014] The beneficial effects of this invention are that by driving the movable seat to move through the axial elongation of the magnetostrictive rod, the elastic element undergoes micron or nanometer-level compressive displacement, enabling fatigue performance testing of the elastic element under micron or nanometer-level micro-strokes. By connecting a programmable power supply to control the frequency of current changes in the electromagnetic coil, fatigue performance testing of the elastic element under high-frequency action can be achieved, accelerating life testing and improving development efficiency. Furthermore, by setting the axis of the electromagnetic coil to be collinear with or parallel to the axis of the magnetostrictive rod, the extension and contraction direction of the magnetostrictive rod is ensured to be a stable and controllable axial extension and contraction, thereby ensuring the accuracy and validity of fatigue performance test results of the elastic element under micron or nanometer-level micro-strokes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the elastic element fatigue performance testing device of this utility model.

[0016] Figure 2 This is a longitudinal section schematic diagram of the fatigue performance testing device for elastic elements according to this utility model.

[0017] In the diagram: 1. Base; 2. Column; 3. Limiting plate; 301. Guide hole one; 4. Movable seat; 5. Positioning shaft; 6. Lower fixing plate; 7. Upper fixing plate; 701. Guide hole two; 8. Fixing rod; 9. Lower silicon steel plate; 10. Upper silicon steel plate; 11. Support column; 12. Guide column; 13. Magnetostrictive rod; 14. Electromagnetic coil; 100. Elastic element to be tested. Detailed Implementation

[0018] like Figure 1 and Figure 2 As shown, this utility model provides a fatigue performance testing device for an elastic element, including a limiting plate 3, a movable seat 4, a magnetostrictive rod 13, and an electromagnetic coil 14. The movable seat 4 is used to place the elastic element 100 to be tested, and the movable seat 4 can move relative to the limiting plate 3 under the action of an external force. The magnetostrictive rod 13 is located on the side of the movable seat 4 opposite to the limiting plate 3, and the magnetostrictive rod 13 is arranged along its own axial direction towards the side of the movable seat 4 opposite to the limiting plate 3. The electromagnetic coil 14 is located on the side of the magnetostrictive rod 13, and the axis of the electromagnetic coil 14 is collinear with or parallel to the axis of the magnetostrictive rod 13. The electromagnetic coil 14 is electrically connected to an external controller. When the electromagnetic coil 14 is energized, it generates a magnetic field. Under the action of the magnetic field of the electromagnetic coil 14, the magnetostrictive rod 13 extends axially to push the movable seat 4 towards the direction of the limiting plate 3, thereby compressing the elastic element 100 to be tested.

[0019] The testing device provided by this invention is based on the magnetostrictive effect. The axial extension of the magnetostrictive rod 13 drives the movable seat 4 to move, causing the elastic element to undergo micron- or nanon-level compressive displacement. This enables fatigue performance testing of the elastic element under minute strokes (micron- or nanon-level). Furthermore, by setting the axis of the electromagnetic coil 14 to be collinear with or parallel to the axis of the magnetostrictive rod 13, the extension and retraction direction of the magnetostrictive rod 13 is ensured to be a stable and controllable axial extension and retraction, thereby ensuring the accuracy and validity of the fatigue performance test results for the elastic element under minute strokes (micron- or nanon-level). By connecting the electromagnetic coil 14 to a programmable power supply, the displacement and frequency required for the test can be adjusted by regulating the current magnitude and frequency, enabling fatigue performance testing of the elastic element under high-frequency action, accelerating life testing, and improving development efficiency.

[0020] In one embodiment of this utility model, the number of electromagnetic coils 14 is one. The magnetostrictive rod 13 is coaxially arranged in the one electromagnetic coil 14, that is, the magnetostrictive rod 13 is arranged in the one electromagnetic coil 14, and the axis of the magnetostrictive rod 13 is collinear with the axis of the electromagnetic coil 14, so as to ensure that the magnetostrictive rod 13 is located in a region with a high magnetic field strength.

[0021] In another embodiment of this utility model, the number of electromagnetic coils 14 is at least two. The magnetostrictive rod 13 is centrally disposed between the sides of the at least two electromagnetic coils 14, and the axis of the electromagnetic coils 14 is parallel to the axis of the at least two electromagnetic coils 14. Figure 2As shown in the example, when there are two electromagnetic coils 14, the magnetostrictive rod 13 is centrally positioned between the sides of the two electromagnetic coils 14 to ensure that the magnetostrictive rod 13 is located in a region with a high magnetic field strength.

[0022] The movable seat 4 has a positioning shaft 5 on the side facing the limiting plate 3. The limiting plate 3 has a guide hole 301, and the positioning shaft 5 passes through the guide hole 301. When the movable seat 4 moves under the action of the magnetostrictive rod 13, the positioning shaft 5 moves synchronously along the guide hole 301. Based on this configuration, the movement of the movable seat 4 can be guided, improving the stability and reliability of its compressive elastic element.

[0023] When the elastic element to be tested is annular, such as a rubber spring, the positioning shaft 5 is preferably centrally located on the side of the movable seat 4 facing the limiting plate 3. When the elastic element to be tested 100 is placed on the movable seat 4, the elastic element to be tested 100 is sleeved on the positioning shaft 5. Based on this arrangement, while guiding the movement of the movable seat 4, the annular elastic element to be tested can also be positioned to prevent it from coming off during the test.

[0024] This utility model also includes a lower fixing plate 6 and an upper fixing plate 7, which are connected by a fixing rod 8 to form a frame-like structure to facilitate the installation of other components. The electromagnetic coil 14 is disposed between the lower fixing plate 6 and the upper fixing plate 7.

[0025] The limiting plate 3 and the movable seat 4 are both located above the upper fixed plate 7. The upper fixed plate 7 has a guide hole 701 at the position corresponding to the magnetostrictive rod 13 to leave clearance space for the magnetostrictive rod 13 to drive the movable seat 4 to move.

[0026] In one embodiment of this utility model, the magnetostrictive rod 13 passes through the guide hole 2 701 and connects to the side of the movable seat 4 away from the limiting plate 3, and the magnetostrictive rod 13 directly drives the movable seat 4 to move.

[0027] In a preferred embodiment of this invention, a support column 11 and a guide column 12 are further included. The support column 11 is disposed on the lower fixed plate 6, and the guide column 12 passes through the guide hole 701 and is connected to the side of the movable seat 4 opposite to the limiting plate 3. The magnetostrictive rod 13 is disposed between the support column 11 and the guide column 12. In this preferred embodiment, the magnetostrictive rod 13 drives the movable seat 4 to move through the guide column 12. Based on the configuration of this preferred embodiment, while ensuring that the magnetostrictive rod 13 can drive the movable seat 4 to move when it extends, the magnetostrictive rod 13 can be centrally positioned in the axial direction of the electromagnetic coil 14 to ensure that the magnetostrictive rod 13 is in a relatively uniform magnetic field region.

[0028] This utility model also includes a lower silicon steel plate 9 and an upper silicon steel plate 10. The lower silicon steel plate 9 is disposed on the lower fixed plate 6, and the support column 11 is disposed on the lower silicon steel plate 9. The upper silicon steel plate 10 is disposed on the upper fixed plate 7, and the upper silicon steel plate 10 has a through hole for the guide column 12 to pass through. The guide column 12 passes through the through hole and is disposed in the guide hole 701. Both the support column 11 and the guide column 12 are made of silicon steel. Based on this arrangement, it can play a role in guiding magnetism, guiding the magnetic field lines to concentrate at the location of the magnetostrictive rod 13, increasing the magnetic field strength at the location of the magnetostrictive rod 13, reducing unnecessary magnetic leakage, improving the utilization rate of the magnetic field, further ensuring the stability and reliability of the testing process, and thus further ensuring the accuracy and validity of the test results.

[0029] This invention also includes a displacement measurement module for measuring the travel distance of the movable seat 4 in the direction of the limiting plate 3, so as to detect the compression travel of the elastic element 100 under test during the test. Specifically, the displacement measurement module can be a laser displacement sensor, which is electrically connected to an external controller, and is mounted above the limiting plate 3 and facing the top of the positioning shaft 5 via a bracket.

[0030] This utility model also includes a base 1 and two columns 2. The lower fixing plate 6 and the two columns 2 are both mounted on the base 1, which serves to support the entire device. The two columns 2 are located on opposite sides of the lower fixing plate 6. The limiting plate 3 is mounted on top of the two columns 2, providing effective support for the limiting plate 3 and ensuring its stability.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0032] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A device for testing the fatigue performance of an elastic element, characterized in that: It includes a limiting plate (3) and a movable seat (4), on which the elastic element (100) to be tested is placed; It also includes a magnetostrictive rod (13) and an electromagnetic coil (14). The magnetostrictive rod (13) is axially positioned on the side of the movable seat (4) away from the limiting plate (3). The electromagnetic coil (14) is located on the side of the magnetostrictive rod (13), and the axis of the electromagnetic coil (14) is collinear or parallel to the axis of the magnetostrictive rod (13). The magnetostrictive rod (13) is axially extended under the action of the magnetic field of the electromagnetic coil (14) to push the movable seat (4) to move in the direction of the limiting plate (3).

2. The fatigue performance testing device for elastic elements as described in claim 1, characterized in that, The number of electromagnetic coils (14) is one, and the magnetostrictive rod (13) is coaxially arranged in the one electromagnetic coil (14).

3. The fatigue performance testing device for elastic elements as described in claim 1, characterized in that, The number of electromagnetic coils (14) is at least two, and the magnetostrictive rod (13) is centrally disposed between the sides of the at least two electromagnetic coils (14), and the axis of the electromagnetic coils (14) is parallel to the axis of the at least two electromagnetic coils (14).

4. The fatigue performance testing device for elastic elements as described in any one of claims 1-3, characterized in that, The movable seat (4) is provided with a positioning shaft (5) on the side facing the limiting plate (3). The limiting plate (3) is provided with a guide hole (301), and the positioning shaft (5) passes through the guide hole (301).

5. The fatigue performance testing device for elastic elements as described in claim 4, characterized in that, The positioning shaft (5) is centrally located on the side of the movable seat (4) facing the limiting plate (3). When the elastic element (100) to be tested is placed on the movable seat (4), the elastic element (100) to be tested is sleeved on the positioning shaft (5).

6. The fatigue performance testing device for elastic elements as described in any one of claims 1-3 and 5, characterized in that, It also includes a lower fixing plate (6) and an upper fixing plate (7), which are connected by a fixing rod (8), and the electromagnetic coil (14) is disposed between the lower fixing plate (6) and the upper fixing plate (7).

7. The fatigue performance testing device for elastic elements as described in claim 6, characterized in that, The limiting plate (3) and the movable seat (4) are both located above the upper fixed plate (7). The upper fixed plate (7) has a guide hole (701) at the position corresponding to the magnetostrictive rod (13).

8. The fatigue performance testing device for elastic elements as described in claim 7, characterized in that, It also includes a support column (11) and a guide column (12). The support column (11) is set on the lower fixed plate (6). The guide column (12) passes through the guide hole (701) and is connected to the side of the movable seat (4) away from the limiting plate (3). The magnetostrictive rod (13) is set between the support column (11) and the guide column (12).

9. The fatigue performance testing device for elastic elements as described in claim 8, characterized in that, It also includes a lower silicon steel plate (9) and an upper silicon steel plate (10). The lower silicon steel plate (9) is set on the lower fixed plate (6), the support column (11) is set on the lower silicon steel plate (9), the upper silicon steel plate (10) is set on the upper fixed plate (7), and the upper silicon steel plate (10) has a through hole. The guide column (12) passes through the through hole and is installed in the guide hole (701). Both the support column (11) and the guide column (12) are made of silicon steel.

10. The fatigue performance testing apparatus for elastic elements as claimed in any one of claims 1-3, 5, 7-9, characterized in that, It also includes a displacement measurement module for measuring the travel distance of the movable seat (4) in the direction of the limiting plate (3).

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