Biaxial tensile test device

Abstract

The utility model discloses a biaxial tensile test device which comprises a three-phase asynchronous motor, a high-speed output shaft and four tensile transmission devices, and each tensile transmission device comprises an inner transmission mechanism, an outer transmission mechanism, a tensile transmission mechanism and a tensile test mechanism; the internal transmission shaft is provided with a lower transmission gear and an upper transmission gear, the external transmission mechanism comprises an external transmission shaft, and the external transmission shaft is sequentially provided with a low-speed large gear, an elastic pin coupler and a turbine rod from the lower end to the upper end. The stretching transmission mechanism comprises a rotating shaft and a worm gear, and the worm gear is arranged on the rotating shaft and is in transmission connection with a worm gear rod; the tensile test mechanism comprises a lead screw nut and a ball screw, and the ball screw is fixedly connected with the worm gear and is in spiral transmission with the lead screw nut. The three-phase asynchronous motor is matched with the four stretching transmission devices to carry out an experiment, single motor driving and low-force biaxial stretching are realized, the maintenance is simple, the cost is low, the low force required by the test can be met, and no special requirement on the shape of a tested piece exists.

Description

Technical Field

[0001] The utility model relates to the technical field of biaxial tensile test devices, and particularly relates to a biaxial tensile test device. Background Art

[0002] The patent document with the application number "CN201810495360.1" discloses a tensile test device, which includes clamping rods and a support groove. The clamping rod is provided with a first through hole that protrudes from the upper clamping portion. The first through hole is used for inserting a fastener so that one end of the workpiece to be tested is connected to the clamping rod. The support groove is provided with a second through hole that protrudes from the lower clamping portion. The second through hole is used for inserting a fastener so that the other end of the workpiece is connected to the support groove. By passing the fastener through the hollow part at one end of the clamping rod and the workpiece, the workpiece can be hung on the clamping rod, and by passing the fastener through the hollow part at the other end of the support groove and the workpiece, the support groove can limit the workpiece, so that the whole workpiece can be stretched during the test.

[0003] The patent document with the application number "CN202210427913.6" discloses a high-speed tensile test device, whose structure is composed of a bottom plate, a support fixing member, a driving wheel support plate, a power support plate guide rod, a test support platform, a power support plate lifting unit, a lower clutch unit, an upper clutch unit, a power support plate, a linear bearing, a high-speed tensile fixture, a specimen, a crossbeam stroke limiting unit, a crossbeam stroke terminal limiting block, a top beam, a test guide optical rod, a test ball screw, a driving unit, an upper crossbeam, a force sensor, a strain measurement unit, a lower crossbeam, a crossbeam stroke adjustment unit, a driving wheel, a driven wheel, a driving wheel support plate positioning member, a driving wheel support plate lifting unit, a driving wheel support plate guide rod and a foot cup. It uses an electric motor as the power, adopts a double moving crossbeam structure, and uses a clutch technology to quickly transfer kinetic energy, can automatically interrupt the power output, and can realize test functions such as high-speed tension, high-speed compression, high-speed impact or high-speed bending.

[0004] In summary, the above patent documents disclose the following defects of the existing biaxial tensile test device in combination with the prior art:

[0005] At present, there are many methods to obtain the biaxial stress state of the material to be tested. For example: film bulging method, pressure vessel method, cross sandwich beam test method, cruciform specimen method, etc. The film bulging method is only applicable to film-like materials. The film is inflated by hydraulic pressure until it swells. At the swelling vertex, it is equivalent to equibiaxial tension, so as to obtain the tensile properties of the material. The pressure vessel method is a common test method in pipelines. Since the internal pressure shell is a typical biaxial tensile structure, the biaxial stress of the spherical shell can be considered as 1:1, while the biaxial stress state of the cylindrical shell is 2:1. In the cross sandwich beam test method, the specimen is bent in a four-point manner, so that the center of the specimen is subjected to biaxial forces. The cruciform specimen method can provide loading forces in different proportions in mutually perpendicular directions to simulate various plane stress states. However, when mutually perpendicular compressive loads are applied to the cruciform specimen, the specimen is prone to bending, which affects the final data. To sum up, the stretching device has problems such as inability to perform low-force stretching and high requirements for the shape of the test specimen. Utility Model Content

[0006] The purpose of the present utility model is to solve the above technical problems, and to provide a biaxial tensile test device, which can solve the problems of inability to perform low-force stretching and high requirements for the shape of the test specimen.

[0007] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0008] A biaxial tensile test device includes a three-phase asynchronous motor, a high-speed output shaft, and 4 tensile transmission devices. Each of the tensile transmission devices includes an internal transmission mechanism, an external transmission mechanism, a tensile transmission mechanism, and a tensile test mechanism; the three-phase asynchronous motor is fixedly connected to the high-speed output shaft and drives the high-speed output shaft to rotate. A high-speed large gear is arranged on the high-speed output shaft; the internal transmission mechanism includes an internal transmission shaft, and a lower transmission gear and an upper transmission gear are arranged on the internal transmission shaft. The external transmission mechanism includes an external transmission shaft, and a low-speed large gear, an elastic pin coupling, and a worm rod are arranged on the external transmission shaft in sequence from the lower end to the upper end; the high-speed large gear meshes with the lower transmission gear for transmission, and the upper transmission gear meshes with the low-speed large gear for transmission; the tensile transmission mechanism includes a rotating shaft and a worm wheel, and the worm wheel is arranged on the rotating shaft and is in transmission connection with the worm rod; the tensile test mechanism includes a screw nut and a ball screw, and the ball screw is fixedly connected to the worm wheel and is in screw transmission with the screw nut; the end parts of the workpiece to be stretched are respectively connected to 4 tensile test mechanisms, and the operation of the three-phase asynchronous motor drives the operation of 4 tensile transmission devices, so that the workpiece to be stretched is stretched by the 4 tensile test mechanisms.

[0009] Preferably, the tensile transmission mechanism further includes a deep groove ball bearing, and the end of the rotating shaft is rotatably installed in a housing assembly through the deep groove ball bearing.

[0010] Preferably, the four stretching transmission mechanisms are divided into a first stretching transmission mechanism, a second stretching transmission mechanism, a third stretching transmission mechanism, and a fourth stretching transmission mechanism. The extension axis of the first stretching transmission mechanism coincides with the extension axis of the second stretching transmission mechanism, and the extension axis of the third stretching transmission mechanism coincides with the extension axis of the fourth stretching transmission mechanism.

[0011] Preferably, the four stretching transmission devices are distributed in a square shape, and the high-speed output shaft is located at the center of the square formed by enclosing the four stretching transmission devices.

[0012] Preferably, the biaxial stretching test device further includes a housing assembly. Rotating bearing seats are provided at both the upper end and the lower end of the external transmission shaft, and the rotating bearing seats are fixed to the housing assembly.

[0013] Preferably, the length of the external transmission shaft is greater than the length of the internal transmission shaft, and the extension direction of the internal transmission mechanism is parallel to the extension direction of the external transmission mechanism.

[0014] Preferably, a flange coupling is provided on the high-speed output shaft, and the high-speed output shaft is rotatably installed in the housing assembly by using angular contact ball bearings.

[0015] Preferably, the housing assembly includes an upper housing assembly and a lower housing assembly. The height of the upper housing assembly is one-fourth to one-fifth of the height of the lower housing assembly.

[0016] Preferably, the upper housing assembly is provided with an upper edge for fixing along the periphery, and the lower housing assembly is provided with a lower edge for fixing along the periphery. The upper edge and the lower edge are detachably fixed by screws.

[0017] Preferably, the upper edge and the lower edge are detachably fixed by screws with a specification of M36*3.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] An experiment is carried out by using the cooperation of a three-phase asynchronous motor, a high-speed output shaft and four stretching transmission devices. It is driven by a single motor, with low-force biaxial stretching and simple maintenance and low cost. It is used for testing the mechanical properties of cultured tissues. It can not only meet the low force required for the experiment, but also has no special requirements for the shape of the test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the present utility model;

[0021] Figure 2 is another perspective view of the present utility model;

[0022] Figure 3 This is another perspective view of the present utility model.

[0023] In the figure: 10, three-phase asynchronous motor; 20, high-speed output shaft; 21, flange coupling; 22, high-speed large gear; 30, internal transmission mechanism; 31, internal transmission shaft; 32, lower transmission gear; 33, upper transmission gear; 40, external transmission mechanism; 41, external transmission shaft; 42, low-speed large gear; 43, elastic pin coupling; 44, worm and rod; 60, stretching transmission mechanism; 61, deep groove ball bearing; 62, rotating shaft; 63, worm gear; 70, tensile test mechanism; 71, screw nut; 72, ball screw; 90, housing assembly; 91, upper housing assembly; 92, lower housing assembly. Detailed implementation manners

[0024] Next, in combination with the accompanying drawings and specific implementation manners, the present utility model will be further described. It should be noted that, on the premise of no conflict, any combination can be formed between the following-described embodiments or technical features.

[0025] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] Please refer to Figures 1-3, A biaxial tensile test device, comprising a three-phase asynchronous motor 10, a high-speed output shaft 20, and 4 tensile transmission devices. Each of the tensile transmission devices includes an internal transmission mechanism 30, an external transmission mechanism 40, a tensile transmission mechanism 60, and a tensile test mechanism 70; the three-phase asynchronous motor 10 is fixedly connected to the high-speed output shaft 20 and drives the high-speed output shaft 20 to rotate. A high-speed large gear 22 is arranged on the high-speed output shaft 20; the internal transmission mechanism 30 includes an internal transmission shaft 31, and a lower transmission gear 32 and an upper transmission gear 33 are arranged on the internal transmission shaft 31. The external transmission mechanism 40 includes an external transmission shaft 41, and a low-speed large gear 42, an elastic pin coupling 43, and a worm and worm gear 44 are arranged on the external transmission shaft 41 in sequence from the lower end to the upper end; the high-speed large gear 22 meshes with the lower transmission gear 32 for transmission, and the upper transmission gear 33 meshes with the low-speed large gear 42 for transmission; the tensile transmission mechanism 60 includes a rotating shaft 62 and a worm gear 63, the worm gear 63 is arranged on the rotating shaft 62, and the worm gear 63 is in transmission connection with the worm and worm gear 44; the tensile test mechanism 70 includes a lead screw nut 71 and a ball screw 72, the ball screw 72 is fixedly connected to the worm gear 63 and is in screw transmission with the lead screw nut 71; the end parts of the workpiece to be stretched are respectively connected to 4 tensile test mechanisms 70. The three-phase asynchronous motor 10 operates to drive the 4 tensile transmission devices to operate, so that the workpiece to be stretched is stretched by the 4 tensile test mechanisms 70, solving the problems of inability to perform low-force stretching and high shape requirements for the test piece.

[0028] Working principle:

[0029] The device of the present utility model is mainly divided into three parts:

[0030] 1. Three-phase asynchronous motor 10

[0031] 2. Transmission mechanism composed of internal transmission mechanism 30 and external transmission mechanism 40

[0032] 3. Execution mechanism composed of tensile transmission mechanism 60 and tensile test mechanism 70. This device uses the motor as the power source, reduces the speed through a two-stage gear reduction mechanism and a worm and worm gear mechanism, and finally realizes biaxial stretching through the combination of a ball screw and a slider.

[0033] Technical effects:

[0034] The cooperation of the three-phase asynchronous motor 10, the high-speed output shaft 20 and 4 tensile transmission devices is used for the experiment. Driven by a single motor, it has low-force biaxial stretching and simple maintenance with low cost. It is used for testing the mechanical properties of cultured tissues. It can not only meet the low force required for the experiment, but also has no special requirements for the shape of the test piece.

[0035] Preferably, the stretching transmission mechanism 60 further includes a deep groove ball bearing 61, and the end of the rotating shaft 62 is rotatably mounted on a housing assembly through the deep groove ball bearing 61.

[0036] Preferably, the four stretching transmission mechanisms 60 are divided into a first stretching transmission mechanism 60, a second stretching transmission mechanism 60, a third stretching transmission mechanism 60, and a fourth stretching transmission mechanism 60. The extension axis of the first stretching transmission mechanism 60 coincides with the extension axis of the second stretching transmission mechanism 60, and the extension axis of the third stretching transmission mechanism 60 coincides with the extension axis of the fourth stretching transmission mechanism 60, improving the accuracy of structural stretching.

[0037] Specifically, in a preferred embodiment, there are high requirements for orientation. The four stretching transmission devices are arranged in a square distribution, and the high-speed output shaft 20 is located at the center of the square formed by enclosing the four stretching transmission devices.

[0038] Preferably, the biaxial stretching test device further includes a housing assembly 90. Rotating bearing seats are provided at the upper and lower ends of the external transmission shaft 41, and the rotating bearing seats are fixed to the housing assembly 90. The length of the external transmission shaft 41 is greater than the length of the internal transmission shaft 31, and the extension direction of the internal transmission mechanism 30 is parallel to the extension direction of the external transmission mechanism 40. The high-speed output shaft 20 is provided with a flange coupling 21, and the high-speed output shaft 20 is rotatably mounted on the housing assembly 90 by using angular contact ball bearings, improving the transmission stability of the structure.

[0039] Preferably, the housing assembly 90 includes an upper housing assembly 91 and a lower housing assembly 92. The height of the upper housing assembly 91 is one-fourth to one-fifth of that of the lower housing assembly 92. The upper housing assembly 91 is provided with an upper edge for fixing along the perimeter, and the lower housing assembly 92 is provided with a lower edge for fixing along the perimeter. The upper edge and the lower edge are detachably fixed by screws. The upper edge and the lower edge are detachably fixed by screws with a specification of M36*3. The whole device has a novel structure, ingenious design, strong applicability, and is convenient for popularization.

[0040] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0041] The above-described embodiments are only preferred embodiments of the present utility model, and the scope of protection of the present utility model cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art based on the present utility model fall within the scope of protection required by the present utility model.

Claims

1. A biaxial tensile testing device, characterized in that: It includes a three-phase asynchronous motor, a high-speed output shaft, and four stretching transmission devices, each of which includes an internal transmission mechanism, an external transmission mechanism, a stretching transmission mechanism, and a stretching test mechanism; The three-phase asynchronous motor is fixedly connected to the high-speed output shaft and drives the high-speed output shaft to rotate, and a high-speed large gear is arranged on the high-speed output shaft; The inner transmission mechanism comprises an inner transmission shaft, on which a lower transmission gear and an upper transmission gear are arranged; the outer transmission mechanism comprises an outer transmission shaft, on which a low-speed gear, an elastic pin coupling and a turbine rod are arranged in sequence from the lower end to the upper end; the high-speed gear meshes with the lower transmission gear for transmission, and the upper transmission gear meshes with the low-speed gear for transmission; The stretching transmission mechanism includes a rotating shaft and a worm wheel, wherein the worm wheel is arranged on the rotating shaft and is drivingly connected to the worm rod; the stretching test mechanism includes a lead screw nut and a ball screw, wherein the ball screw is fixedly connected to the worm wheel and is spirally driven with the lead screw nut; the ends of the workpiece to be stretched are respectively connected to the four stretching test mechanisms, and the operation of the three-phase asynchronous motor drives the operation of the four stretching transmission devices, so that the workpiece to be stretched is stretched by the four stretching test mechanisms.

2. The biaxial tensile testing device according to claim 1, characterized in that: The stretching transmission mechanism also includes a deep groove ball bearing, and the end of the rotating shaft is rotatably mounted on a housing assembly through the deep groove ball bearing.

3. The biaxial tensile testing device according to claim 1, characterized in that: The four stretching transmission mechanisms are divided into a first stretching transmission mechanism, a second stretching transmission mechanism, a third stretching transmission mechanism, and a fourth stretching transmission mechanism. The extension axis of the first stretching transmission mechanism coincides with the extension axis of the second stretching transmission mechanism, and the extension axis of the third stretching transmission mechanism coincides with the extension axis of the fourth stretching transmission mechanism.

4. The biaxial tensile testing device according to claim 3, characterized in that: The four stretching transmission devices are distributed in a square shape, and the high-speed output shaft is located at the center of the square enclosed by the four stretching transmission devices.

5. The biaxial tensile testing device according to claim 1, characterized in that: The biaxial tensile testing device further comprises a housing assembly, and a rotating bearing seat is disposed at the upper end and the lower end of the external transmission shaft, and the rotating bearing seat is fixed to the housing assembly.

6. The biaxial tension test device according to claim 5, characterized in that: The length of the external transmission shaft is greater than that of the internal transmission shaft, and the extension direction of the internal transmission mechanism is parallel to the extension direction of the external transmission mechanism.

7. The biaxial tension test device according to claim 5, characterized in that: The high-speed output shaft is provided with a flange coupling, and the high-speed output shaft is rotatably mounted on the housing assembly by an angular contact ball bearing.

8. The biaxial tension test device according to claim 7, characterized in that: The shell assembly comprises an upper shell assembly and a lower shell assembly, and the height of the upper shell assembly is one quarter to one fifth of the height of the lower shell assembly.

9. The biaxial tension test device according to claim 8, characterized in that: The upper shell component is provided with an upper edge for fixing along its four sides, and the lower shell component is provided with a lower edge for fixing along its four sides, and the upper edge and the lower edge are detachably fixed by screws.

10. The biaxial tension test device according to claim 9, characterized in that: The upper edge and the lower edge are detachably fixed by screws with a specification of M36*3.

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