Fatigue testing device for strain sensor

Abstract

The utility model provides a strain sensor fatigue testing device, which comprises a fixed seat, a carrier plate and a driving piece, the fixed seat and the driving piece are arranged at an interval, the carrier plate is partially fixed on the fixed seat, the driving piece is connected with a non-fixed part of the carrier plate, a sensor is attached to the carrier plate, and the sensor is fixed on the carrier plate. The driving part reciprocates to enable the carrying plate to elastically deform, and the sensor is installed in the direction of the connecting line of the fixing base and the driving part. According to the utility model, the stress condition of the blade in the actual working process can be simulated, and the fatigue test reliability of the sensor is improved.

Description

Technical Field

[0001] This utility model relates to the field of strain sensor testing technology, and specifically to a strain sensor fatigue testing device. Background Technology

[0002] Wind turbine blades vibrate under external forces during operation. To ensure safety, strain sensors must be installed on the blades to monitor the stress on them and prevent safety issues caused by blade fatigue. Therefore, it is necessary to select appropriate strain sensors for wind turbine blade testing. Before formal use, strain sensors need to undergo fatigue testing to simulate pressure fluctuations that may be encountered in actual operation, thereby ensuring the reliability of the sensors during use.

[0003] Common fatigue testing devices for strain sensors include a loading component and a fixing component. The loading component is vertically positioned, and the strain sensor is fixed to the fixing component. The loading component moves downward to apply a load to the strain sensor to conduct the fatigue test. The loading conditions in this type of testing device deviate significantly from the actual stress conditions experienced by the blade, failing to provide the sensor with load conditions similar to those in actual operating conditions. This results in reduced sensor reliability, and the sensor cannot accurately reflect the stress experienced by the blade during operation. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a strain sensor fatigue testing device that can simulate the stress conditions of a blade during actual operation and improve the reliability of sensor fatigue testing.

[0005] This utility model proposes a strain sensor fatigue testing device, including a fixed base, a carrier plate, and a driving component. The fixed base and the driving component are spaced apart. One side of the carrier plate is fixed to the fixed base, and the driving component is connected to the other side of the carrier plate. The sensor is attached to the carrier plate. The reciprocating motion of the driving component causes the carrier plate to undergo elastic deformation. The sensor is installed along the line connecting the fixed base and the driving component.

[0006] The preferred technical solution of this utility model is as follows: a movable clamping plate is detachably provided on the fixed base, and the carrier plate is clamped between the movable clamping plate and the fixed base.

[0007] The preferred technical solution of this utility model is as follows: the driving component includes a connecting rod, a wheel, and a drive motor. The wheel is coaxially arranged with the output shaft of the drive motor. A first connecting hole offset from its center is provided on the wheel. A mounting seat for connecting the carrier plate is provided at the end of the connecting rod. A second connecting hole is provided on the mounting seat. The two ends of the connecting rod are rotatably connected to the first connecting hole and the second connecting hole, respectively.

[0008] The preferred technical solution of this utility model is as follows: the first connecting hole is an oblong hole, the first connecting hole extends radially along the wheel, the end of the connecting rod is provided with a first connecting shaft, the first connecting shaft is fixedly connected to the first connecting hole, and the connecting rod can rotate relative to the first connecting shaft.

[0009] The preferred technical solution of this utility model is as follows: the mounting base includes a mounting plate and a connecting plate connected together, the second connecting hole is an oblong hole set on the connecting plate, the mounting plate is fixedly connected to the carrier plate, the other end of the connecting rod is provided with a second connecting shaft, the second connecting shaft is fixedly connected to the second connecting hole, and the connecting rod can rotate relative to the second connecting shaft.

[0010] The preferred technical solution of this utility model is as follows: the mounting plate is perpendicular to the connecting plate, and the mounting plate is connected to the side of the carrier plate.

[0011] The preferred technical solution of this utility model is that the drive motor is a speed-regulating motor.

[0012] The preferred technical solution of this utility model is that the carrier plate is a fiberglass board.

[0013] The preferred technical solution of this utility model is that multiple sensors are installed at intervals on the carrier plate.

[0014] The strain sensor fatigue testing device of this utility model has the following advantages: In this device, one end of the carrier plate is fixed on the fixed base, and the other end is oscillated by the driving component to simulate the force situation of the blade during operation. The sensor is installed on it for fatigue testing, and the test results are more reliable. The oscillation amplitude of the carrier plate can be changed by changing the rotation frequency of the drive motor, and the adjustment method is quick and convenient. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0016] Figure 1 This is a schematic diagram illustrating the operation of an embodiment of the present utility model.

[0017] Figure 2 This is a side view of an embodiment of the present utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the driving component in an embodiment of the present invention.

[0019] In the diagram: 10, driving component; 11, drive motor; 12, wheel; 121, first connecting hole; 13, connecting rod; 131, first connecting shaft; 132, second connecting shaft; 14, mounting base; 141, mounting plate; 142, connecting plate; 143, second connecting hole; 20, fixed base; 21, fixed clamping plate; 22, movable clamping plate; 30, carrier plate; 40, sensor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0021] Please see Figures 1 to 3 A fatigue testing device for a strain sensor 40 includes a fixed base 20, a carrier plate 30, and a driving component 10. The driving component 10 and the fixed base 20 are spaced apart. A portion of the carrier plate 30 is fixed to the fixed base 20. The driving component 10 connects to the non-fixed portion of the carrier plate 30 and reciprocates. The carrier plate 30 has a certain elastic deformation capacity. Under the action of the driving component 10, the carrier plate 30 undergoes elastic deformation, simulating the oscillation generated during the operation of a blade. The strain sensor 40 is mounted on the carrier plate 30 for fatigue testing. The straight-line distance between the fixed base 20 and the driving component 10 is defined as the length direction of the carrier plate 30. The sensor 40 is mounted on the carrier plate 30 along the length direction of the carrier plate 30 and is positioned close to the fixed base 20.

[0022] A fixed clamping plate 21 is fixedly installed on the top of the fixed base 20. The fixed clamping plate 21 is a flat plate, and a movable clamping plate 22 is installed on it. The movable clamping plate 22 is a flat plate, and waist-shaped holes are opened on both sides of the movable clamping plate 22. Bolts are installed in the waist-shaped holes to fix the movable clamping plate 22 to the fixed clamping plate 21.

[0023] Preferably, the distance between the waist-shaped holes on both sides of the movable clamping plate 22 is greater than the width of the carrier plate 30. The movable clamping plate 22 can span the width of the carrier plate 30 and cover it, so as to avoid the bolts from penetrating the carrier plate 30 when the movable clamping plate 22 is connected to the fixed clamping plate 21, which would affect the strength of the carrier plate 30.

[0024] As another implementation, the middle part of the carrier plate 30 is pressed onto the fixed base 20, and driving members 10 are respectively provided at both ends of the carrier plate 30. The two driving members 10 provide loads at both ends of the carrier plate 30, which can simulate the force on the blade under another blade installation method (i.e., the blade is installed in the middle and the blade rotates around the middle).

[0025] In this embodiment, one end of the carrier plate 30 is laid on the fixed clamping plate 21, and the movable clamping plate 22 is pressed on the end of the carrier plate 30 to fix the end of the carrier plate 30 on the fixed base 20, simulating the installation method of blade end installation and blade rotation around its end. This application will describe the embodiment.

[0026] The driving component 10 includes a drive motor 11, a connecting rod 13, and a wheel 12. The wheel 12 is a disc coaxially arranged with the output shaft of the drive motor 11, and has an eccentrically positioned first connecting hole 121. A mounting base 14 is provided at the end of the connecting rod 13, and the mounting base 14 is fixedly connected to the carrier plate 30. The mounting base 14 has a second connecting hole 143. Both ends of the connecting rod 13 are rotatably connected to the first connecting hole 121 and the second connecting hole 143, respectively. When the drive motor 11 rotates, it drives the wheel 12 to rotate around its output shaft. The wheel 12 causes the connecting rod 30 to swing, thereby lifting or pulling down the end of the carrier plate 30 during the swing, applying a load to the carrier plate 30 and the sensor 40 on it. The carrier plate 30, driven by the driving component 10, simulates the swinging situation under actual working conditions, which helps to more accurately perform fatigue testing on the sensor 40.

[0027] The drive motor 11 is a speed-regulating motor, which can be a variable-speed motor, stepper motor, electromagnetic motor, or any other motor whose rotation frequency can be changed. By changing the rotation frequency of the drive motor 11, the swing arm of the carrier plate 30 is controlled, thereby applying different loads to the sensor 40. Specifically, the wheel 12, connecting rod 13, and carrier plate 30 form a structure similar to a crank-rocker mechanism, but unlike a traditional crank-rocker mechanism, because the carrier plate 30 is elastic, when the rotation frequency of the drive motor 11 changes, the impact generated by the rotation of the drive motor 11 is transmitted to the carrier plate 30 through the wheel 12 and connecting rod 13, causing the carrier plate 30 to swing and deform. The sensor 40, attached to the carrier plate 30, detects this deformation to evaluate the safety and stability of the carrier plate 30, and tests the fatigue performance of the sensor 40 by analyzing the stress changes.

[0028] Specifically, when the rotation frequency of the drive motor 11 is low, the impact generated during its rotation is small, resulting in a smaller swing amplitude of the carrier plate 30 due to the impact of the connecting rod 13, and a smaller load applied to the carrier plate 30 by the drive component 10. Conversely, when the rotation frequency of the drive motor 11 is high, the impact generated during its rotation is larger, resulting in a larger swing amplitude of the carrier plate 30 under force, and a smaller load applied to the carrier plate 30 by the drive component 10. The load applied to the sensor 40 can be adjusted by changing the rotation frequency of the drive motor 11, allowing for fatigue testing of the sensor 40. Simultaneously, the periodic rotation of the drive motor 11 can cause a periodic change in the force on the carrier plate 30, enabling the testing of both the fatigue performance of the sensor 40 and the performance of its demodulation device.

[0029] Furthermore, the first connecting hole 121 is an oblong hole that extends radially along the wheel 12. A first connecting shaft 131 is provided at the end of the connecting rod 13. The connecting rod 13 and the first connecting shaft 131 are rotatably connected. The first connecting shaft 131 is inserted into the first connecting hole 121 and fixed by a nut. By moving the first connecting shaft 131, its position within the first connecting hole 121 can be changed, thereby altering the lever arm length of the connecting rod 13 that drives the wheel 12 to swing, thus changing the swing amplitude of the carrier plate 30. Specifically, when the first connecting shaft 131 is fixed close to the center of the wheel 12, the lever arm length of the wheel 12 is smaller, the swing amplitude of the carrier plate 30 is smaller, and the load on the sensor 40 is smaller; when the connecting shaft is fixed close to the outer side of the wheel 12, the lever arm length of the wheel 12 is larger, the swing amplitude of the carrier plate 30 is larger, and the load on the sensor 40 is larger. By changing the connection position between the first connecting shaft 131 and the first connecting hole 121, and by changing the rotation frequency of the drive motor 11, the load range applied to the sensor 40 can be expanded.

[0030] Furthermore, the second connecting hole 143 is an oblong hole that extends along the length of the carrier plate 30. The end of the connecting rod 13 is provided with a second connecting shaft 132. The connecting rod 13 and the second connecting shaft 132 are rotatably connected. The second connecting shaft 132 is inserted into the second connecting hole 143 and fixed by a nut. The second connecting hole 143 expands the installation range of the connecting rod 13 and the mounting base 14, thereby increasing the connection flexibility between the connecting rod 13 and the mounting base 14.

[0031] Mounting base 14 includes mounting plate 141 and connecting plate 142. Second connecting hole 143 is provided on connecting plate 142. Mounting plate 141 is used to connect carrier plate 30. Mounting plate 141 is perpendicular to and connected to connecting plate 142. Mounting plate 141 is set to fit against carrier plate 30.

[0032] Furthermore, the carrier plate 30 is disposed on the side of the carrier plate 30. Specifically, the mounting plate 141 is disposed against the top surface of the carrier plate 30, the connecting plate 142 is disposed against the side of the carrier plate 30, and the connecting rod 13 and the drive motor 11 are both disposed on the same side of the carrier plate 30 as the mounting base 14. In this connection method, the load applied by the drive component 10 to the carrier plate 30 is a unilateral load, and the carrier plate 30 is subjected to uneven force, which can simulate the uneven force on the blade during operation and improve the testing accuracy of the sensor 40.

[0033] Furthermore, the two driving components 10 are symmetrically arranged on both sides of the carrier plate 30. The two driving components 10 work together to provide load to the carrier plate 30, and the carrier plate 30 is subjected to uniform force, providing more test exposure for the sensor 40 and obtaining more measurement data.

[0034] Furthermore, multiple sensors 40 are attached to the carrier plate 30. The multiple sensors 40 are spaced apart along the length and width of the carrier plate 30. At the same time, fatigue tests are performed on the multiple sensors 40 at different positions on the carrier plate 30 to improve the testing efficiency.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A strain sensor fatigue testing apparatus, characterized by, The utility model relates to a sensor fixing device, including fixed seat (20), carrier plate (30) and drive piece (10), fixed seat (20) is spaced apart with drive piece (10), one side of carrier plate (30) is fixed on fixed seat (20), drive piece (10) connects the other side of carrier plate (30), sensor (40) is pasted on carrier plate (30), drive piece (10) reciprocating action makes carrier plate (30) occur elastic deformation, sensor (40) is installed along the direction of fixed seat (20) and drive piece (10) line connection.

2. A strain sensor fatigue testing apparatus according to claim 1, wherein The movable clamping plate (22) is detachably arranged on the fixed seat (20), and the carrier plate (30) is clamped between the movable clamping plate (22) and the fixed seat (20).

3. The strain sensor fatigue testing apparatus of claim 1, wherein, The drive piece (10) comprises a connecting rod (13), a wheel disc (12) and a drive motor (11), the wheel disc (12) is coaxially arranged with the output shaft of the drive motor (11), the wheel disc (12) is provided with a first connecting hole (121) deviated from the center, the connecting rod (13) is provided with a mounting seat (14) connected with the carrier plate (30) at the end, the mounting seat (14) is provided with a second connecting hole (143), and the connecting rod (13) is rotatably connected with the first connecting hole (121) and the second connecting hole (143) at both ends.

4. A strain sensor fatigue testing apparatus according to claim 3, wherein The first connecting hole (121) is a waist-shaped hole, the first connecting hole (121) extends along the radial direction of the wheel disc (12), the connecting rod (13) is provided with a first connecting shaft (131) at the end, the first connecting shaft (131) is fixedly connected with the first connecting hole (121), and the connecting rod (13) can rotate relative to the first connecting shaft (131).

5. A strain sensor fatigue testing apparatus according to claim 4, wherein The mounting seat (14) comprises a mounting plate (141) and a connecting plate (142) connected with each other, the second connecting hole (143) is a waist-shaped hole arranged on the connecting plate (142), the mounting plate (141) is fixedly connected with the carrier plate (30), the connecting rod (13) is provided with a second connecting shaft (132) at the other end, the second connecting shaft (132) is fixedly connected with the second connecting hole (143), and the connecting rod (13) can rotate relative to the second connecting shaft (132).

6. A strain sensor fatigue testing apparatus according to claim 5, wherein The mounting plate (141) is perpendicular to the connecting plate (142), and the mounting plate (141) is connected with the side edge of the carrier plate (30).

7. The strain sensor fatigue testing apparatus of claim 3, wherein, The drive motor (11) is a speed-regulating motor.

8. The strain sensor fatigue testing apparatus of claim 1, wherein, The carrier plate (30) is a glass fiber plate.

9. The strain sensor fatigue testing apparatus of claim 1, wherein, A plurality of sensors (40) are arranged on the carrier plate (30) at intervals.

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