Tensile testing device

Abstract

This utility model relates to a tensile testing device, which includes a stand, a tensile transmission mechanism, and a testing mechanism. The tensile transmission mechanism includes a tensile shaft and a mounting base, and the testing mechanism includes a tensile sensor and a movable connector. The power module to be tested is mounted on the mounting base. When the propeller rotates, it will cause the tensile shaft to rotate and slide, thereby transmitting the tensile force and torque generated by the propeller to the testing mechanism. Since the tensile sensor and the tensile shaft are connected by the movable connector, and the second end of the movable connector can rotate and deflect relative to the first end, the movable connector can only transmit tensile force and not torque between the tensile shaft and the tensile sensor. That is, the torque generated by the propeller will be isolated by the movable connector and cannot be transmitted to the tensile sensor, so the tensile force value measured by the tensile sensor will not be affected by torque. Therefore, the above-mentioned tensile testing device can significantly improve the accuracy of tensile testing.

Description

Technical Field

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

[0002] With the gradual development of the low-altitude economy, various types of aircraft, such as eVTOL (electric vertical takeoff and landing aircraft), are being rapidly developed. During the development process, it is necessary to conduct tensile tests on the power modules that provide lift to the aircraft, such as the combination of motors and propellers, to obtain the accurate thrust values ​​that the motors can provide to the aircraft at different output speeds or torques. This allows engineers to understand the dynamic characteristics of the aircraft. However, the propeller, when rotating, not only provides thrust but also inevitably generates torque. The torque transmitted from the propeller to the tensile sensor will affect the accuracy of the tensile test. Utility Model Content

[0003] Therefore, it is necessary to provide a tensile testing device that can improve the accuracy of tensile testing in order to address the above problems.

[0004] A tensile testing device, comprising:

[0005] stand;

[0006] A force transmission mechanism includes a force shaft and a mounting base, wherein the force shaft is rotatably mounted on the platform and can slide relative to the platform along its own axial direction, and the mounting base is fixed to the force shaft; and

[0007] The testing mechanism includes a tension sensor and a movable connector. The movable connector includes a first end and a second end that can rotate and deflect relative to the first end. The first end is connected to the tension sensor, and the second end is connected to the tension shaft.

[0008] In one embodiment, the platform includes a base and at least two shaft fixing seats spaced apart from the base, and the tension shaft is slidably passed through the at least two shaft fixing seats in sequence.

[0009] In one embodiment, each of the shaft mounting bases is connected to the tension shaft via a linear bearing.

[0010] In one embodiment, the mounting base is disc-shaped and coaxially arranged with the tension shaft.

[0011] In one embodiment, the testing mechanism further includes a front connector and a rear connector, the front connector and the rear connector being keyed together, the front connector being fixedly connected to the tension shaft, and the second end being connected to the tension shaft through the front connector, and the rear connector being fixedly connected to the test stand.

[0012] In one embodiment, both the front connector and the rear connector are cylindrical, and the movable connector and the tension sensor are housed within the space enclosed by the front connector and the rear connector.

[0013] In one embodiment, the front connector and the rear connector are keyed together and coaxially arranged with the tension shaft.

[0014] In one embodiment, the front connector has a plurality of keyways formed thereon, and the rear connector has a plurality of splines formed thereon. The front connector and the rear connector are interlocked and the keyways and splines are bonded together.

[0015] In one embodiment, the two ends of the tension shaft are respectively provided with an adapter flange and an adapter seat, the mounting seat is connected to the tension shaft through the adapter flange, and the front connector is connected to the tension shaft through the adapter seat.

[0016] In one embodiment, the movable connector is configured as a universal joint ball joint, with the first end and the second end respectively disposed on the two ball heads of the universal joint ball joint.

[0017] In the aforementioned tensile testing device, the power module to be tested is mounted on a mounting base. When the propeller rotates, it drives the tension shaft to rotate and slide, thereby transmitting the tension and torque generated by the propeller to the testing mechanism. Since the tension sensor and the tension shaft are connected via a movable connector, and the second end can rotate and deflect relative to the first end, the movable connector can only transmit tension, not torque, between the tension shaft and the tension sensor. That is, the torque generated by the propeller is blocked by the movable connector and cannot be transmitted to the tension sensor; therefore, the tension value measured by the tension sensor will not be affected by torque. Thus, the aforementioned tensile testing device can significantly improve the accuracy of tensile testing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the tensile testing device in one embodiment of the present invention;

[0020] Figure 2 for Figure 1 Top view of the tensile testing device shown;

[0021] Figure 3 for Figure 1 Front view of the tensile testing device shown;

[0022] Figure 4 for Figure 3 A cross-sectional view along AA in the tensile testing device shown;

[0023] Figure 5 for Figure 3 A cross-sectional view along BB in the tensile testing device shown;

[0024] Figure 6 for Figure 3 A cross-sectional view along CC of the tensile testing device shown;

[0025] Figure 7 for Figure 1 The diagram shows the structure of the movable connector in the tensile testing device. Detailed Implementation

[0026] To make the above-mentioned objects, 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. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Please see Figure 1 , Figure 2 and Figure 3 In one embodiment of the present invention, the tensile testing device 100 includes a stand 110, a tensile transmission mechanism 120, and a testing mechanism 130.

[0033] The stand 110 provides support for the entire device. Specifically, in this embodiment, the stand 110 includes a base plate 111, a shaft fixing seat 112, and a test fixing seat 113. The base plate 111 can be supported on a workbench or fixedly connected to other support structures. The shaft fixing seat 112 and the test fixing seat 113 are mounted on one side of the surface of the base plate 111. The shaft fixing seat 112 supports the tension transmission mechanism 120, while the test fixing seat 113 supports the test mechanism 130. Of course, it should be noted that the structure of the stand 110 is not limited to this; it is acceptable as long as it can provide good support.

[0034] The force transmission mechanism 120 includes a force shaft 121 and a mounting base 122. The force shaft 121 is rotatably mounted on the frame 110 and can slide relative to the frame 110 along its own axial direction. The mounting base 122 is fixed to the force shaft 121. Specifically, the mounting base 122 is connected to the force shaft 121 via an adapter flange 150. One end of the adapter flange 150 is provided with a sleeve structure that can be sleeved with the force shaft 121, and the other end is plate-shaped and can be fixedly connected to the mounting base 122 by multiple threaded fasteners, thereby improving the ease of installation of the mounting base 122 and the force shaft 121.

[0035] Mounting bracket 122 is used to install the power module. For eVTOL, the power module includes a propeller and a motor. Mounting bracket 122 can be plate-shaped or disc-shaped, with a large surface area and mounting points to facilitate the installation of the power module. After the power module is started, the rotation of the propeller will drive the thrust shaft 121 to rotate and slide, thereby transmitting the thrust and torque generated by the propeller downward along the thrust shaft 121.

[0036] Specifically, in this embodiment, the test stand 110 includes at least two shaft fixing seats 112 spaced apart from the base 111, and the tension shaft 121 is slidably inserted through at least two shaft fixing seats 112 in sequence. In this way, the tension shaft 121 is installed more stably, and it is not easy for the tension shaft 121 to shake after the power module is started, thereby eliminating adverse interference and improving the accuracy of the final tension test result.

[0037] Please refer to the following: Figure 5 In this embodiment, each shaft fixing seat 112 is connected to the tension shaft 121 via a linear bearing 140. The linear bearing 140 allows the tension shaft 121 to both rotate around its own axis and slide along its own axis. Moreover, the linear bearing 140 can significantly reduce the friction between the shaft fixing seat 112 and the tension shaft 121, thereby helping to further improve the accuracy of tension detection.

[0038] Furthermore, in this embodiment, the mounting base 122 is disc-shaped and coaxially arranged with the tension shaft 121. This ensures that the center of gravity of the power module on the mounting base 122 maintains a high degree of overlap with the center of the tension shaft 121, preventing the tension shaft 121 from vibrating violently due to centrifugal force after the power module is started, thereby further improving the stability of the tension shaft 121.

[0039] Please refer to the following: Figure 4 and Figure 7The testing mechanism 130 includes a tension sensor 131 and a movable connector 132. The movable connector 132 includes a first end 1321 and a second end 1322 that can rotate and deflect relative to the first end 1321. The first end 1321 is connected to the tension sensor 131, and the second end 1322 is connected to the tension shaft 121. The tension sensor 131 is fixedly mounted on the stand 110. Specifically, the tension sensor 131 can be fixedly connected to the base plate 111 or the test fixture 113 by means of threaded fasteners.

[0040] Specifically, in this embodiment, the movable connector 132 is configured as a universal joint ball joint, with the first end 1321 and the second end 1322 respectively disposed on the two ball heads of the universal joint ball joint. It should be noted that in other embodiments, the movable connector 132 can also be a cross shaft, a spherical bearing, or a joint connector, as long as it has a first end 1321 and a second end 1322 that can rotate and swing relative to each other.

[0041] The tension and torque generated by the propeller rotation are transmitted to the testing mechanism 130 through the tension shaft 121. Since the tension sensor 131 is connected to the tension shaft 121 via a movable connector 132, and the second end 1322 can rotate and deflect relative to the first end 1321, the movable connector 132 can only transmit tension, not torque, between the tension shaft 121 and the tension sensor 131. That is, the torque generated by the propeller is blocked by the movable connector 132 and cannot be transmitted to the tension sensor 131. Therefore, the tension value measured by the tension sensor 131 will not be affected by torque, thus avoiding any adverse effect of torque on the accuracy of the tension test.

[0042] In this embodiment, the testing mechanism 130 further includes a front connector 133 and a rear connector 134. The front connector 133 and the rear connector 134 are keyed together. The front connector 133 is fixedly connected to the tension shaft 121, and the second end 1322 is connected to the tension shaft 121 through the front connector 133. The rear connector 134 is fixedly connected to the stand 110.

[0043] Specifically, the rear connector 134 can be fixedly connected to the test mounting base 113 via threaded fasteners, while the front connector 133 is connected to the tension shaft 121 via an adapter 160. The adapter 160 has a structure similar to the adapter flange 150. One end of the adapter 160 is equipped with a sleeve structure that can be fitted onto the tension shaft 121, while the other end is plate-shaped and can be fixedly connected to the front connector 133 via multiple threaded fasteners, thereby improving the ease of installation between the front connector 133 and the tension shaft 121.

[0044] Please refer to the following: Figure 6The front connector 133 and the rear connector 134 are keyed together by a spline and keyway engagement, allowing them to slide axially relative to each other but not rotate about their own axes. This enables the transmission of torque but not tensile force between them. Specifically, in this embodiment, the front connector 133 has multiple keyways 1331, and the rear connector 134 has multiple splines 1341. The front connector 133 and the rear connector 134 are interlocked, with the keyways 1331 and splines 1341 engaging. Alternatively, in other embodiments, splines can be provided on the front connector 133 and keyways on the rear connector 134.

[0045] The tension and torque generated by the propeller rotation are first transmitted to the front connector 133 via the tension shaft 121. The tension is then transmitted to the tension sensor 131 via the movable connector 132, thus realizing the tension test. Since the movable connector 132 isolates the torque, the torque cannot be transmitted to the tension sensor 131. Instead, it is ultimately transmitted to the test bench 110 through the cooperation of the front connector 133 and the rear connector 134. Moreover, under the constraint of the test bench 110, the tension shaft 121 cannot rotate around its own axis, thereby ensuring that the tension shaft 121 always maintains high stability and further improving the accuracy of the tension detection.

[0046] It should be noted that in other embodiments, the front connector 133 and the rear connector 134 may also be omitted, so that the tension shaft 121 will rotate around its own axis under the action of torque.

[0047] Furthermore, in this embodiment, both the front connector 133 and the rear connector 134 are cylindrical, and the movable connector 132 and the tension sensor 131 are housed within the space enclosed by the front connector 133 and the rear connector 134. The front connector 133 and the rear connector 134 can both be cylindrical, and they are generally coaxially arranged. After the front connector 133 and the rear connector 134 are mated together, they can form a large internal space, thereby accommodating the movable connector 132 and the tension sensor 131, making the tensile testing device 100 more compact.

[0048] Furthermore, specifically in this embodiment, the front connector 133 and the rear connector 134 are keyed together and coaxially arranged with the tension shaft 121.

[0049] In the aforementioned tensile testing device 100, the power module to be tested is mounted on the mounting base 122. When the propeller rotates, it will cause the tension shaft 121 to rotate and slide, thereby transmitting the tension and torque generated by the propeller to the testing mechanism 130. Since the tension sensor 131 is connected to the tension shaft 121 via a movable connector 132, and the second end 1322 can rotate and deflect relative to the first end 1321, the movable connector 132 can only transmit tension, not torque, between the tension shaft 121 and the tension sensor 131. That is, the torque generated by the propeller will be blocked by the movable connector 132 and cannot be transmitted to the tension sensor 131. Therefore, the tension value measured by the tension sensor 131 will not be affected by torque. Thus, the aforementioned tensile testing device 100 can significantly improve the accuracy of tensile testing.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A tensile testing device, characterized in that, include: stand; A tension transmission mechanism includes a tension shaft and a mounting base. The tension shaft is rotatably mounted on the platform and can slide relative to the platform along its own axial direction. The mounting base is fixed to the tension shaft. and The testing mechanism includes a tension sensor and a movable connector. The movable connector includes a first end and a second end that can rotate and deflect relative to the first end. The first end is connected to the tension sensor, and the second end is connected to the tension shaft.

2. The tensile testing device according to claim 1, characterized in that, The platform includes a base and at least two shaft fixing seats spaced apart from the base, and the tension shaft is slidably passed through the at least two shaft fixing seats in sequence.

3. The tensile testing device according to claim 2, characterized in that, Each of the shaft mounting bases is connected to the tension shaft via a linear bearing.

4. The tensile testing device according to claim 1, characterized in that, The mounting base is disc-shaped and is coaxially arranged with the tension shaft.

5. The tensile testing device according to claim 1, characterized in that, The testing mechanism further includes a front connector and a rear connector. The front connector and the rear connector are keyed together. The front connector is fixedly connected to the tension shaft, and the second end is connected to the tension shaft through the front connector. The rear connector is fixedly connected to the test stand.

6. The tensile testing device according to claim 5, characterized in that, Both the front connector and the rear connector are cylindrical, and the movable connector and the tension sensor are housed within the space enclosed by the front connector and the rear connector.

7. The tensile testing device according to claim 6, characterized in that, The front connector and the rear connector are keyed together and coaxially arranged with the tension shaft.

8. The tensile testing device according to claim 5, characterized in that, The front connector has multiple keyways, and the rear connector has multiple splines. The front connector and the rear connector are interlocked, and the keyways and splines are bonded together.

9. The tensile testing device according to claim 5, characterized in that, The tension shaft is provided with an adapter flange and an adapter seat at both ends. The mounting seat is connected to the tension shaft through the adapter flange, and the front connector is connected to the tension shaft through the adapter seat.

10. The tensile testing device according to claim 1, characterized in that, The movable connector is configured as a universal joint ball joint, with the first end and the second end respectively disposed on the two ball heads of the universal joint ball joint.

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