An equibiaxial tensile testing device

Abstract

The utility model provides a kind of equal biaxial tensile test device.The device includes: device rack;A pair of first clamping components movably set on device rack, can mutually move away along preset first linear direction;A pair of second clamping components movably set on device rack, can mutually move away along preset second linear direction;Driving mechanism is fixed on device rack, for output rotation power;Transmission mechanism, using tooth surface engagement mode carries out power transmission, for rotating power transmission to a pair of first clamping components and a pair of second clamping components, drive clamping component to move synchronously with same displacement amount.Wherein, first linear direction and second linear direction are orthogonal.It is through the transmission mechanism of tooth surface engagement, realizes the synchronous drive of one driving mechanism to four clamping components, effectively reduces the complexity of device realization cost and motion control.

Description

Technical Field

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

[0002] Elastomers such as rubber and silicone have wide applications in daily life. These elastomers often exhibit hyperelastic properties. To characterize the hyperelastic mechanical behavior of these elastomers, it is necessary to collect relevant data through isoaxial tensile testing to fit the constitutive relationship of the elastomer.

[0003] Equi-biaxial tensile testing is a biaxial loading test method. It simulates the stress state of a material under complex stress conditions by applying tensile loads of the same magnitude and simultaneously along two mutually orthogonal directions to the test sample.

[0004] Existing biaxial tensile testing equipment typically uses four motors to drive the clamping device to simultaneously stretch the test sample in two orthogonal directions. Because biaxial tensile testing requires synchronization of the tensile load, the four motors need to move synchronously, which is difficult to control and expensive to implement.

[0005] To overcome the drawbacks of high cost and difficulty in synchronous motion control of four motors, some existing biaxial tensile testing equipment uses the interaction between the magnetic fields generated between coils to achieve biaxial tensile testing of the test sample. However, this method is difficult to control the tensile speed in two orthogonal directions and is also prone to generating heat, which can cause the test sample to heat up and affect the test results.

[0006] Some biaxial tensile testing equipment utilizes complex linkage mechanisms for mechanical transmission to achieve biaxial tensile testing of the test sample. However, biaxial tensile testing based on linkage mechanisms suffers from drawbacks such as short tensile stroke and difficulty in precise control, and still cannot adequately meet the practical application needs of biaxial tensile testing.

[0007] In summary, existing biaxial tensile testing devices or planar biaxial tensile testing schemes suffer from drawbacks such as high cost and asynchronous motion. Utility Model Content

[0008] The present invention provides an equal biaxial tensile testing device, which aims to solve the problems of high cost and asynchronous movement of existing equal biaxial tensile testing devices.

[0009] In a first aspect, this utility model provides an isometric biaxial tensile testing device. It includes: a device frame; a pair of first clamping components, movably disposed on the device frame and movable away from each other along a preset first straight line direction; a pair of second clamping components, movably disposed on the device frame and movable away from each other along a preset second straight line direction; a drive mechanism fixed to the device frame for outputting rotational power; and a transmission mechanism connected to the drive mechanism for transmitting the rotational power to the pair of first clamping components and the pair of second clamping components; wherein the first straight line direction is orthogonal to the second straight line direction, and the transmission mechanism uses tooth surface meshing to transmit power, driving the first clamping components and the second clamping components to move synchronously with the same displacement.

[0010] Optionally, the transmission mechanism includes: a power distribution component connected to the drive mechanism for transmitting the rotational power to multiple output shafts; and multiple motion conversion components, each output shaft being connected to a corresponding first clamping component or second clamping component via one of the motion conversion components; wherein each motion conversion component is used to convert the rotational motion of the output shaft into the linear motion of the corresponding first clamping component or second clamping component; the multiple output shafts have the same rotational speed, so that any first clamping component and any second clamping component move synchronously with the same displacement.

[0011] Optionally, the driving mechanism includes: a drive shaft; the drive shaft is used to output rotational motion; wherein the drive shaft is perpendicular to the stretching plane formed by the preset first straight line direction and the preset second straight line direction; the drive shaft is parallel to the output shaft, and the plurality of output shafts are parallel to each other.

[0012] Optionally, the power distribution assembly includes: a drive bevel gear fixed to the end of the drive shaft and rotating with the drive shaft; a plurality of first transmission shafts, each of which has a first reversing bevel gear and a second reversing bevel gear at both ends, and each first transmission shaft is rotatably mounted on the device frame; a plurality of second transmission shafts, each of which has a third reversing bevel gear and forms an output shaft; wherein the first transmission shafts are parallel to the stretching plane, and the second transmission shafts are parallel to the drive shaft; the first reversing bevel gear meshes with the drive bevel gear, and the second reversing bevel gear meshes with the third reversing bevel gear.

[0013] Optionally, the motion conversion assembly includes: a conversion gear, which is fixedly disposed at one end of the second transmission shaft; and a rack, which extends along the preset straight direction and is disposed on the first clamping component or the second clamping component; wherein the conversion gear meshes with the rack.

[0014] Optionally, the plurality of motion conversion components include: at least one pair of first motion conversion components and at least one pair of second motion conversion components; the plurality of output shafts include: a first output shaft, the first output shaft being connected to a corresponding first clamping member via a first motion conversion component; a second output shaft, the second output shaft being connected to a corresponding second clamping member via a first motion conversion component; a third output shaft, the third output shaft being connected to another corresponding first clamping member via a second motion conversion component; and a fourth output shaft, the fourth output shaft being connected to another corresponding second clamping member via a second motion conversion component; wherein the first output shaft, the second output shaft, the third output shaft, and the fourth output shaft have the same direction of rotation; the first motion conversion component and the second motion conversion component have opposite transmission structure configurations, so that rotational motions in the same direction of rotation are respectively converted into linear motions in opposite directions of movement by the first motion conversion component and the second motion conversion component.

[0015] Optionally, the first output shaft and the third output shaft are spaced apart along the preset first straight line direction; the second output shaft and the fourth output shaft are spaced apart along the preset second straight line direction.

[0016] Optionally, the biaxial tensile testing apparatus further includes: a first guide mechanism disposed between the first clamping member and the device frame, the first guide mechanism being used to guide the first clamping member to move along the preset first linear direction; and a second guide mechanism disposed between the second clamping member and the device frame, the second guide mechanism being used to guide the second clamping member to move along the preset second linear direction.

[0017] Optionally, the first clamping component includes: a first component body, which is movably mounted on the device frame via the first guide mechanism; a first clamp, which is disposed at the end of the first component body for clamping one edge of the workpiece to be tested; and a first force sensor, which is disposed on the first clamp for collecting mechanical data of the workpiece to be tested under tension. The second clamping component includes: a second component body, which is movably mounted on the device frame via the second guide mechanism; a second clamp, which is disposed at the end of the second component body for clamping one edge of the workpiece to be tested; and a second force sensor, which is disposed on the second clamp for collecting mechanical data of the workpiece to be tested under tension.

[0018] Optionally, the device frame includes: a pair of first support portions; the pair of first support portions are spaced apart along the preset first straight line direction; a pair of second support portions; the pair of second support portions are spaced apart along the preset second straight line direction; wherein, a pair of first clamping members are respectively movably disposed on the pair of first support portions, and a pair of second clamping members are respectively movably disposed on the pair of second support portions; the drive mechanism is fixedly disposed in the gap space of the device frame, the gap space being composed of the gap between the pair of first support portions and the gap between the pair of second support portions.

[0019] The biaxial tensile testing device provided in this embodiment achieves synchronous driving of four clamping components by a single drive mechanism through a gear meshing transmission mechanism, ensuring that the test sample is subjected to equal tensile forces simultaneously in two mutually orthogonal directions. It requires only one drive mechanism, significantly reducing the device's implementation cost and motion control complexity. Furthermore, it can easily meet the testing requirements of different tensile speeds by changing the operating state of the drive mechanism. Overall, it is simple to operate and has high control precision. Moreover, the transmission mechanism uses gear meshing for power transmission, facilitating maintenance and manufacturing, and ensuring that the clamping components achieve synchronous movement with the same displacement in orthogonal directions, guaranteeing symmetry and consistency during the tensile testing process. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are designated as the same elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the structure of the isoaxial tensile testing device provided in an embodiment of the present invention; Figure 2 An exploded view of the isoaxial tensile testing device provided in an embodiment of this utility model; Figure 3 A schematic diagram of the clamping component of the isoaxial tensile testing device provided in an embodiment of this utility model; Figure 4 A schematic diagram of the transmission mechanism of the biaxial tensile testing device provided in this embodiment of the utility model; Figure 5 A tensile diagram of the isoaxial tensile testing device provided in an embodiment of this utility model; Figure 6 A schematic diagram of the biaxial tensile testing device provided in this embodiment of the present invention in the first linear direction x1; Figure 7 A schematic diagram of the biaxial tensile testing device provided in this embodiment of the invention in the second linear direction x2.

[0022] Figure label: Device frame 10, first support part 11, second support part 12; First clamping component 20, first component body 21, first clamp 22, first force sensor 23; Second clamping component 30, second component body 31, second clamp 32, second force sensor 33; Drive mechanism 40, drive shaft 41; Transmission mechanism 50, power distribution assembly 51, motion conversion assembly 52, output shaft 53; Drive bevel gear 511, first drive shaft 512, second drive shaft 513, conversion gear 521, rack 522; First reversing bevel gear 514a, second reversing bevel gear 514b, third reversing bevel gear 514c; first output shaft 51a, second output shaft 51b, third output shaft 51c, fourth output shaft 51d, first motion conversion assembly 52a, second motion conversion assembly 52b; First guide mechanism 61, first slide rail 611, first slider 612; second guide mechanism 62, second slide rail 621, second slider 622. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0024] It should be noted that, unless otherwise explicitly specified and limited, the terms "opposite", "axial", "circumferential", "insertion", "vertical", "parallel", "inner", "inner side", "outer side", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] The terms “installation,” “fitting,” “connection,” and “fixing” should be interpreted broadly. For example, “connection” can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. “Fixing” can be fixed with bolts, clips, or glue.

[0026] 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 technical features indicated; thus, a feature defined as “first” or “second” may explicitly or implicitly include one or more of that feature; “multiple” or “several” means two or more. To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a schematic diagram of the structure of the isoaxial tensile testing device provided in an embodiment of this utility model. Figure 1 As shown, the biaxial tensile testing device includes: a frame 10, a pair of first clamping parts 20, a pair of second clamping parts 30, a drive mechanism 40, and a transmission mechanism 50.

[0028] The device frame 10 is the basic support structure used to support and position the various functional components. It can adopt any suitable structural form based on the needs of the actual application, and no specific limitations are made here.

[0029] For example, in order to meet the load-bearing requirements of the four clamping components, such as Figure 2 As shown, the device frame 10 includes a pair of first support parts 11 and a pair of second support parts 12.

[0030] A pair of first support portions 11 are spaced apart along a preset first straight direction x1, and are used to support a pair of first clamping components 20. A pair of second support portions 12 are spaced apart along a preset second straight direction x2, and are used to support a pair of second clamping components 30.

[0031] The gap between a pair of first support parts 11 and the gap between a pair of second support parts 12 together form a gap space. The drive mechanism 40 can be fixedly installed in this gap space, and its drive shaft 41 for outputting rotational motion is located at the intersection of the first linear direction x1 and the second linear direction x2.

[0032] The first clamping component 20 is a component used to clamp the workpiece 2 to be tested in one direction. It is arranged in pairs along a preset first straight line direction x1. The pair of first clamping components 20 are movably arranged on the device frame 10 and can move away from or towards each other along the first straight line direction x1.

[0033] In this invention, the term "movably set" is used to describe a structural arrangement in which a component can perform a specific form of mechanical movement relative to its mounting base within a specific motion path or degree of freedom.

[0034] The second clamping component 30 is a component used to clamp the workpiece 2 to be tested in another direction. It is also arranged in pairs along a preset second straight direction x2. The pair of second clamping components 30 are also movably arranged on the device frame 10, and can move away from or towards each other along the second straight direction x2.

[0035] In this embodiment of the invention, the first linear direction x1 and the second linear direction x2 are two orthogonal directions. Thus, by driving a pair of first clamping components 20 to move away from each other in the first linear direction x1, and simultaneously driving a pair of second clamping components 30 to move away from each other in the second linear direction x2, the workpiece 2 to be tested can be stretched in the two orthogonal directions to perform an isometric tensile test.

[0036] The drive mechanism 40 is a device for providing mechanical power. It is fixed to the device frame 10 and outputs mechanical energy in the form of rotational motion, serving as the power source for the biaxial tensile testing device. Depending on the needs of the practical application, the drive mechanism 40 can be any suitable type of device or equipment capable of outputting rotational power; no specific limitation is made here. For example, an electric motor.

[0037] Specifically, such as Figure 2 As shown, the drive mechanism 40 includes a drive shaft 41 for outputting rotary motion. The drive shaft 41 outputs rotary motion by rotating about its own axis. In spatial arrangement, the drive shaft 41 is perpendicular to the stretching plane formed by a preset first linear direction x1 and a preset second linear direction x2.

[0038] The transmission mechanism 50 is a power transmission assembly disposed between the drive mechanism 40 and the various clamping components. For example, please refer to [link to relevant documentation]. Figure 1The transmission mechanism may include a first mechanical transmission component 50a for distributing power and a second mechanical transmission component 50b for realizing changes in motion.

[0039] The first mechanical transmission component 50a serves as a power input end, and its multiple rotating shafts are connected to the drive mechanism 40 via tooth meshing, so as to simultaneously distribute and transmit the rotational power output by the drive mechanism 40 to the four power output ends.

[0040] The four rotating shafts, which serve as power output ends, can also be connected to the corresponding second mechanical transmission component 50b through tooth meshing, thereby realizing the transformation of motion form during power transmission, and thus synchronously driving a pair of first clamping components 20 to move away from each other along the first straight direction x1 and driving a pair of second clamping components 30 to move away from each other along the second straight direction x2.

[0041] In this embodiment of the invention, the transmission mechanism 50 includes at least two mechanical transmission components with meshing tooth surfaces. These mechanical transmission components have matching tooth profiles and can achieve power transmission and / or motion transformation through tooth surface contact and meshing, thereby enabling the power output by one drive mechanism to simultaneously drive the first clamping component and the second clamping component to move synchronously with the same displacement, so as to meet the symmetry and consistency requirements of the isoaxial tensile test.

[0042] Unlike other transmission methods such as linkage or belt drive, tooth meshing is based on the continuous meshing relationship between tooth surfaces, which enables the motion of the input component to be transmitted to the output component in a certain proportion, completing a specific form of power transmission between the input and output components, such as the distribution of power transmission direction, the conversion of motion form, or the change of motion direction.

[0043] For example, Figure 1 The paper demonstrates tooth surface meshing methods using bevel gear meshing during power transmission and using planar gear and rack meshing during motion mode conversion.

[0044] Alternatively, helical or arc-shaped teeth can be used for power transmission, and helical gears and racks can be used for motion conversion. Such tooth surface meshing helps to improve the smoothness and stability of the first and second clamping components during linear movement, allowing the workpiece to be tested to be stretched more stably and smoothly.

[0045] "The same displacement" means that the distances moved by the first clamping component and the second clamping component within the same time period are the same. This synchronous movement ensures that the tension applied to the pair of first clamping components 20 and the pair of second clamping components 30 in two orthogonal directions is consistent, which can meet the requirements of isoaxial tensile testing.

[0046] In some embodiments, please continue reading Figure 1 In order to ensure that the first clamping component or the second clamping component can move stably and reliably along the corresponding straight direction (i.e., the first straight direction x1 or the second straight direction x2), the biaxial tensile testing device further includes: a first guide mechanism 61 and a second guide mechanism 62.

[0047] The first guide mechanism 61 is disposed between the first clamping component 20 and the device frame 10, and is used to guide the first clamping component 20 to move along a preset first linear direction x1. The second guide mechanism 62 is disposed between the second clamping component 30 and the device frame 10, and is used to guide the second clamping component 30 to move along a preset second linear direction x2.

[0048] In this invention, a "guiding mechanism" refers to a structural component used to define and guide the movement of a component in a predetermined direction. Based on the needs of the actual application, any suitable type of guiding structure can be selected (e.g., a guiding structure in which a slide rail and a slider cooperate, or a guiding structure in which a guide post and a guide sleeve cooperate), and no specific limitation is made herein.

[0049] For example, such as Figure 2 As shown, the first guiding mechanism 61 is composed of a first slide rail 611 and a first slider 612 that cooperate with each other. The first slide rail 611 is disposed on the first clamping member 20 and extends along the first straight direction x1. The first slider 612 is disposed on the first support part 11 of the device bracket and is sleeved on the first slide rail 611.

[0050] Thus, through the cooperation between the first slide rail 611 and the first slider 612, the first clamping component 20 can be limited and guided to move along the first linear direction x1.

[0051] Please continue reading. Figure 2 The second guide mechanism 62 can also be implemented using the same slide rail and slider mechanism. It includes a second slide rail 621 and a second slider 622 that cooperate with each other. The difference between it and the first guide mechanism 62 is that the second slide rail 621 extends along the second linear direction x2, thereby defining and guiding the movement of the second clamping member 30 along the second linear direction x2.

[0052] In some embodiments, the first clamping member 20 and the second clamping member 30 may be provided with suitable structural forms to meet the assembly requirements of the aforementioned guiding mechanism and transmission mechanism.

[0053] Figure 3 This is a schematic diagram of a first clamping component 20 and a second clamping component 30. Figure 3As shown, the first clamping component 20 includes: a first component body 21, a first clamp 22, and a first force sensor 23.

[0054] The first component body 21 is the main structure of the first clamping component 20. It is generally a long strip extending in a straight direction and is used to set the first slide rail 611 of the first guide mechanism 61. Thus, through the mutual cooperation between the first slide rail 611 and the first slider 612, the first component body 21 can be movably mounted on the device frame 10.

[0055] The first clamp 22 is a clamping member used to clamp and fix one edge of the workpiece 2 to be tested. It is located at one end of the first component body 21 to form a clamping station.

[0056] The first mechanical sensor 23 is a sensor used to collect and sense stress data. It is mounted on the first clamp 22, located on the clamping surface between the first clamp 22 and the workpiece to be tested, and is capable of collecting mechanical data of the workpiece under tension.

[0057] Please continue reading. Figure 3 The second clamping component 30 includes: a second component body 31, a second clamp 32, and a second force sensor 33.

[0058] The second component body 31 is the main structure of the second clamping component 30. It may have a similar shape and structure to the first component body 21, and is also provided with a second slide rail 621 of the second guide mechanism 62. Thus, through the cooperation between the second slide rail 621 and the second slider 622, the second component body 31 is movably mounted on the device frame 10.

[0059] The second clamp 32 is used to clamp and fix one edge of the workpiece 2 to be tested. It is located at the end of the second component body 31 and is used to clamp the edge of the workpiece to be tested in another direction.

[0060] The second force sensor 33 is mounted on the second clamp 32 and is used to collect and sense stress. The data sensor is located on the clamping surface between the second clamp 32 and the workpiece 2 to be tested, and can collect the mechanical data of the workpiece under tension.

[0061] In some embodiments, such as Figure 4 As shown, based on the functions to be performed during power transmission, the transmission mechanism 50 includes: a power distribution component 51 and a motion conversion component 52.

[0062] It should be noted that, Figure 4To clearly demonstrate the specific implementation of the transmission mechanism 50, only the case of forming one output shaft is shown as an example. For specific configurations involving multiple output shafts, please refer to the examples provided. Figure 5 The situation shown.

[0063] The power distribution component 51 is a functional unit used to split and transmit the rotational power of a single input to multiple different paths. It is connected to the drive mechanism 40 and is used to transmit the rotational power input from the drive mechanism 40 to multiple different output shafts 53.

[0064] Exemplarily, adapted to the aforementioned pair of first clamping members 20 and pair of second clamping members 30, such as Figure 5 As shown, the output shaft 53 can be configured to have 4 (in Figure 5 For ease of distinction and description, they are labeled as 51a, 51b, 51c and 51d respectively, and are used to drive a pair of first clamping parts 20 and a pair of second clamping parts 30 respectively.

[0065] For details, please continue reading. Figure 4 The power distribution assembly 51 specifically includes: a drive bevel gear 511, a first drive shaft 512, and a second drive shaft 513.

[0066] The drive bevel gear 511 is fixed to the end of the drive shaft 41 and can rotate with the drive shaft 41. The first transmission shaft 512 is a rotating shaft parallel to the stretching plane, which is rotatably mounted on the device frame 10 and can rotate about its own axis. The second transmission shaft 513 is a rotating shaft parallel to the drive shaft 41 and is rotatably mounted on the device frame 10.

[0067] Based on the needs of practical applications, both the first drive shaft 512 and the second drive shaft 513 can be rotatably mounted on the device frame through any suitable rotating connection structure. For example, both the first drive shaft 512 and the second drive shaft 513 can be rotatably mounted on the device frame via rotating bearings, with the device frame serving as a rotating base.

[0068] The first drive shaft 512 has reversing bevel gears at both ends, referred to as "first reversing bevel gear 514a" and "second reversing bevel gear 514b" respectively. The second drive shaft 513 has a third reversing bevel gear 514c.

[0069] In the actual transmission process, the first reversing bevel gear 514a meshes with the driving bevel gear 511, so that the rotational motion of the driving shaft 41 can drive the rotation of the first transmission shaft 512, realizing the conversion of the rotational motion in the rotational direction.

[0070] The second reversing bevel gear 514b meshes with the third reversing bevel gear 514c, so that the rotational motion of the first drive shaft 512 can drive the rotation of the second drive shaft 513, realizing another conversion of the rotational motion in the rotational direction, so that the second drive shaft 513 forms an output shaft 53 parallel to the drive shaft 41.

[0071] The motion conversion component 52 is a functional unit used to convert between rotary and linear motion. Depending on the needs of the application, the motion conversion component 52 can employ any suitable type of mechanical structure. For example, a lead screw and nut mechanism, a rack and pinion mechanism, or a cam-slider mechanism.

[0072] For example, please continue reading Figure 4 The motion conversion component 52 adopts a gear and rack mechanism, which consists of a conversion gear 521 and a rack 522.

[0073] The conversion gear 521 is fixedly mounted at one end of the second drive shaft 513. The other end of the second drive shaft 513 is rotatably mounted on the device frame 10 via a rotary bearing. The rack 522 is mounted on the clamping member and extends a predetermined distance in a straight line (when mounted on the first clamping member 20, it extends along a predetermined first straight line direction x1, and when mounted on the second clamping member 30, it extends along a predetermined second straight line direction x2).

[0074] By engaging the gear 521 with the rack 522, the rotational motion output from the second drive shaft 513 is converted into linear motion of the clamping component along a straight line.

[0075] In this embodiment, the motion conversion components 52 and output shafts 53 are paired and have the same number. In other words, each output shaft 53 is connected to a corresponding clamping component (first clamping component 20 or second clamping component 30) through a motion conversion component 52.

[0076] Thus, the rotational motion of the output shaft 53 is converted into the linear motion of the corresponding first clamping component or the second clamping component, enabling the transmission mechanism 50 to synchronously drive a pair of first clamping components 20 and a pair of second clamping components 30 to perform linear motion based on a single input rotational motion.

[0077] In this embodiment of the invention, each of the plurality of output shafts 53 has the same rotational speed. By using the same motion conversion component 52, it can be ensured that each first clamping component 20 and each second clamping component 30 can move synchronously with the same displacement and have the same moving speed.

[0078] It should be noted that, Figure 4To clearly demonstrate the specific implementation of the power distribution assembly 51, only the case of setting up a first drive shaft 512 and a second drive shaft 513 to mesh to form an output shaft 53 is shown as an example.

[0079] based on Figure 4 The same setup shown can be used to create more output shafts 53 by setting more first drive shafts 512 and second drive shafts 513, which can be used to drive multiple different clamping components at the same time.

[0080] To fully describe the inventive concept of the embodiments of this utility model, the following is combined with... Figures 5 to 7 The specific implementation of the biaxial tensile testing device is described in detail. Figure 5 The diagram shows the situation when part of the top structure of the clamping component is removed, so as to clearly show the tooth surface engagement mode of the motion conversion assembly 52. Figure 6 The illustration shows the scenario where the second clamping component and its associated transmission mechanism have been removed. Figure 7 Shown in Figure 6 From the same perspective, the case where the first clamping component and its related transmission mechanism are removed.

[0081] In this embodiment, as Figure 5 As shown, the biaxial tensile testing device is provided with a pair of first clamping parts 20 and a pair of second clamping parts 30.

[0082] The power distribution assembly 51 is provided with four first drive shafts 512 and four second drive shafts 513, which transmit the rotational power input from a drive mechanism 40 to the four output shafts for synchronous output. The four output shafts are respectively referred to as "first output shaft 51a", "second output shaft 51b", "third output shaft 51c" and "fourth output shaft 51d".

[0083] Specifically, the first output shaft 51a and the third output shaft 51c are spaced apart along the first linear direction x1, and are used to drive a pair of first clamping components 20 respectively. The second output shaft 51b and the fourth output shaft 51d are spaced apart along the second linear direction x2, and are used to drive a pair of second clamping components 30 respectively.

[0084] It should be noted that the "multiple output shafts having the same rotational speed" is not the result of active adjustment through external control means, but is inherently determined by the mechanical transmission characteristics of the transmission mechanism 50.

[0085] Since the rotational power of all output shafts 53 (i.e., the first output shaft 51a, the second output shaft 51b, the third output shaft 51c, and the fourth output shaft 51d) originates from the same drive shaft 41 and is distributed through a tooth meshing system with a defined transmission ratio (i.e., the power distribution assembly 51), the rotational speed relationship of all output shafts 53 relative to the drive shaft 41 is fixed once the mechanical transmission system is machined and assembled. When the drive shaft 41 rotates at a certain speed, all output shafts 53 will passively and forcibly rotate synchronously at the same speed.

[0086] This synchronization method, based on a single power source and mechanical meshing transmission, fundamentally ensures the synchronicity and consistency of power distribution, eliminating the need for complex electronic control systems to coordinate multiple motors. Furthermore, through the motion conversion component 52 with identical transmission parameters, the same rotational speed of the output shaft 53 is converted into the same linear movement speed of the corresponding clamping components, ultimately achieving absolute synchronization and equality of the displacement of the four clamping components in two orthogonal directions, meeting the stringent requirements of biaxial tensile testing.

[0087] The motion conversion assembly 52 includes two component parts with opposite transmission structure configurations, referred to as the first motion conversion assembly 52a and the second motion conversion assembly 52b, respectively.

[0088] In this utility model, "opposite transmission structure configuration" means that when the first motion conversion component 52a and the second motion conversion component 52b are converted into linear motion, they output linear motion in opposite directions.

[0089] In other words, when the first motion conversion component 52a and the second motion conversion component 52b are input with rotational motion in the same direction, they will drive the clamping component to produce linear motion in opposite directions.

[0090] The specific implementation of this opposite transmission configuration is determined by the specific implementation of the motion conversion component 52. For example, when the motion conversion component 52 is implemented by a rack and pinion mechanism, the opposite transmission configuration can be achieved by the different relative arrangement directions between the rack and pinion.

[0091] For example, please continue reading Figure 5 The first motion conversion component 52a includes a first conversion gear 521a and a first rack 522a. The second motion conversion component 52b includes a second conversion gear 521b and a second rack 522b.

[0092] Specifically, the first rack 522a meshes with the positive half-circumference edge of the first conversion gear 521a, while the second rack 522b meshes with the negative half-circumference edge of the second conversion gear 521b. Therefore, when the first conversion gear 521a and the second conversion gear 521b have the same direction of rotation, the first rack 522a and the second rack 522b will drive the corresponding pair of first clamping members 20 to move in opposite directions.

[0093] For the stretching along the first linear direction x1: as follows: Figure 6 As shown, the first output shaft 51a is connected to a corresponding first clamping component 20 via a first motion conversion component 52a. The third output shaft 51c is connected to another corresponding first clamping component 20 via a second motion conversion component 52b.

[0094] Therefore, when the drive shaft 41 outputs rotational motion, driving the first output shaft 51a and the third output shaft 51c to rotate synchronously in the same rotational direction, the first motion conversion component 52a and the second motion conversion component 52b will drive the two first clamping components 20 to move away from each other along the preset first straight line direction x1, and stretch the workpiece to be tested in the first straight line direction x1.

[0095] For the stretching along the second straight direction x2, as Figure 7 As shown, the second output shaft 51b is connected to a corresponding second clamping component 30 via a first motion conversion assembly 52a. The fourth output shaft 51d is connected to another corresponding second clamping component 30 via a second motion conversion assembly 52b.

[0096] Therefore, when the drive shaft 41 outputs rotational motion, driving the second output shaft 51b and the fourth output shaft 51d to rotate synchronously in the same rotational direction, the first motion conversion component 52a and the second motion conversion component 52b will drive the two second clamping components 30 to move away from each other along the preset second straight line direction x2, stretching the workpiece to be tested in the second straight line direction x2.

[0097] In summary, the biaxial tensile testing device provided by this utility model only requires one drive mechanism as a power source to achieve synchronous stretching / contraction in two orthogonal directions, which significantly reduces costs compared to the traditional method of using four motors for synchronous stretching.

[0098] Furthermore, by controlling the drive shaft of the drive mechanism to rotate at a constant speed, synchronous uniform stretching / contraction in two orthogonal directions can be achieved, improving the accuracy and reliability of mechanical and strain data acquisition, reducing the difficulty of constitutive model fitting, eliminating the need for synchronous control of multiple motors, and reducing the difficulty of motion control.

[0099] In transmission mechanisms, power is transmitted using tooth meshing. The structural components that make up the transmission mechanism, such as bevel gears, drive shafts, bearings, and racks, are low in manufacturing cost and difficulty, and are easy to maintain.

[0100] In addition, the stretching rate in two orthogonal directions can be easily adjusted by adjusting the specifications of gears, racks, and bevel gears, which helps to obtain accurate biaxial stretching data and meet the needs of practical applications.

[0101] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A biaxial tensile testing device, characterized in that, include: Device frame; A pair of first clamping components are movably disposed on the device frame and can be moved away from each other along a preset first straight direction; A pair of second clamping components are movably mounted on the device frame and can be moved away from each other along a preset second straight direction; A drive mechanism, fixed on the device frame, is used to output rotational power; A transmission mechanism, connected to the drive mechanism, is used to transmit the rotational power to a pair of first clamping components and a pair of second clamping components; Wherein, the first straight line direction is orthogonal to the second straight line direction, and the transmission mechanism uses tooth surface meshing to transmit power, driving the first clamping component and the second clamping component to move synchronously with the same displacement.

2. The isoaxial biaxial tensile testing device according to claim 1, characterized in that, The transmission mechanism includes: A power distribution assembly, connected to the drive mechanism, is used to transmit the rotational power to multiple output shafts; Multiple motion conversion components, each of the output shafts is connected to a corresponding first clamping component or second clamping component through one of the motion conversion components; Each of the motion conversion components is used to convert the rotational motion of the output shaft into the linear motion of the corresponding first clamping component or second clamping component; The multiple output shafts have the same rotational speed, so that any one of the first clamping components and any one of the second clamping components moves synchronously with the same amount of displacement.

3. The isoaxial biaxial tensile testing device according to claim 2, characterized in that, The drive mechanism includes: a drive shaft; the drive shaft is used to output rotational motion; Wherein, the drive shaft is perpendicular to the stretching plane formed by the preset first straight line direction and the preset second straight line direction; The drive shaft is parallel to the output shaft, and the plurality of output shafts are parallel to each other.

4. The isoaxial tensile testing device according to claim 3, characterized in that, The power distribution component includes: A drive bevel gear is fixed to the end of the drive shaft and rotates with the drive shaft; Multiple first drive shafts, each of which has a first reversing bevel gear and a second reversing bevel gear at both ends, and each first drive shaft is rotatably mounted on the device frame; Multiple second drive shafts, each of which is provided with a third reversing bevel gear, and together form one of the output shafts; Wherein, the first transmission shaft is parallel to the stretching plane, and the second transmission shaft is parallel to the drive shaft; The first reversing bevel gear meshes with the driving bevel gear, and the second reversing bevel gear meshes with the third reversing bevel gear.

5. The isoaxial biaxial tensile testing device according to claim 4, characterized in that, The motion conversion component includes: A conversion gear is fixedly disposed at the other end of the second drive shaft, away from the third reversing bevel gear; A rack, which extends along the preset straight line direction and is disposed on the first clamping component or the second clamping component; The conversion gear meshes with the rack.

6. The isoaxial biaxial tensile testing device according to claim 2, characterized in that, The plurality of motion conversion components include: at least one pair of first motion conversion components and at least one pair of second motion conversion components; The plurality of said output shafts include: A first output shaft, the first output shaft being connected to a corresponding first clamping component via a first motion conversion component; The second output shaft is connected to a corresponding second clamping component via a first motion conversion component; A third output shaft, wherein the third output shaft is connected to another corresponding first clamping component via a second motion conversion component; The fourth output shaft is connected to another corresponding second clamping component via a second motion conversion component; The first output shaft, the second output shaft, the third output shaft, and the fourth output shaft have the same direction of rotation. The first motion conversion component and the second motion conversion component have opposite transmission structure configurations, so that rotational motion in the same direction of rotation is converted into linear motion in opposite directions of movement by the first motion conversion component and the second motion conversion component, respectively.

7. The isoaxial biaxial tensile testing apparatus according to claim 6, characterized in that, The first output shaft and the third output shaft are spaced apart along the preset first straight line direction; The second output shaft and the fourth output shaft are spaced apart along the preset second straight line direction.

8. The isoaxial biaxial tensile testing apparatus according to claim 1, characterized in that, Also includes: A first guiding mechanism is disposed between the first clamping component and the device frame, and the first guiding mechanism is used to guide the first clamping component to move along the preset first straight line direction; A second guiding mechanism is disposed between the second clamping component and the device frame. The second guiding mechanism is used to guide the second clamping component to move along the preset second linear direction.

9. The isoaxial biaxial tensile testing apparatus according to claim 8, characterized in that, The first clamping component includes: The first component body is movably mounted on the device frame via the first guide mechanism; A first clamp is disposed at the end of the first component body and is used to clamp one edge of the workpiece to be tested; The first mechanical sensor is mounted on the first fixture and is used to collect mechanical data of the workpiece under test when it is under tension. The second clamping component includes: The second component body is movably mounted on the device frame via the second guide mechanism; The second clamp is disposed at the end of the second component body and is used to clamp one edge of the workpiece to be tested; The second mechanical sensor, which is mounted on the second fixture, is used to collect mechanical data of the workpiece under test during tension.

10. The isoaxial biaxial tensile testing apparatus according to claim 1, characterized in that, The device frame includes: A pair of first support portions; the pair of first support portions are spaced apart along the preset first straight line direction; A pair of second support portions; the pair of second support portions are spaced apart along the preset second straight line direction; Wherein, a pair of first clamping components are movably disposed on a pair of first support portions, and a pair of second clamping components are movably disposed on a pair of second support portions; The drive mechanism is fixedly disposed in the gap space of the device frame, and the gap space is composed of the gap between a pair of first support parts and the gap between a pair of second support parts.

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