Novel multifunctional fixed experiment platform

Abstract

The invention relates to a novel multifunctional fixed experimental platform, which belongs to the field of precise clamping and fixing tests and comprises a support guide assembly, a micro damping moving assembly, a precise control assembly and a clamping and fixing assembly. Wherein the tiny damping moving assembly can greatly reduce the influence of friction force generated by tiny deformation of the tested metamaterial on a final experimental result through a guide rail sliding block structure of the tiny damping moving assembly, and meanwhile, the precise control assembly can be suitable for fixing various complex metamaterial structures due to the high-degree-of-freedom deformation capability of the precise control assembly. According to the invention, the problem that the experimental result is not authentic, consistent and accurate because the surface of a universal test platform has a large friction factor in the positive and negative Poisson's ratio ballast and tension experiments of the conventional metamaterial structure is solved, and meanwhile, the mechanism is suitable for various complex working conditions and has the characteristics of high degree of freedom and high adaptability.

Description

Technical Field

[0001] This invention belongs to the field of fixed clamping, and specifically relates to a novel multifunctional fixed experimental platform. Background Technology

[0002] In recent years, mechanical metamaterials, especially structures with negative Poisson's ratio, programmable mechanical response, and large deformation capabilities, have shown significant application prospects in fields such as energy absorption and buffering, flexible mechanisms, smart structures, and soft robots. To accurately evaluate the mechanical properties of such metamaterials under compression, tension, strain, and multiaxial coupled loads, quasi-static or dynamic loading tests are typically performed using a universal testing machine.

[0003] However, traditional universal testing platforms have significant limitations when testing metamaterials. On one hand, there is typically a large coefficient of friction between the loading platform and the specimen in a universal testing machine. When the metamaterial undergoes lateral contraction, rotation, or complex coupled deformation under load, this friction introduces additional constraint forces and loads, severely interfering with the actual structural response. This is especially true for negative Poisson's ratio metamaterials, tensile monolithic structures, and compliant metamaterial units, whose mechanical behavior is highly sensitive to boundary conditions. Traditional rigid fixing methods often result in insufficient accuracy, consistency, and repeatability of test results. On the other hand, existing fixing and clamping devices have low degrees of freedom and limited adaptability, making it difficult to meet the stable fixing requirements of complex topologies, irregular geometries, or structures with large deformations. During experiments, the specimen often needs to be stably clamped while allowing for small follow-up displacements or attitude adjustments to avoid introducing unnecessary constraints. However, existing experimental platforms typically struggle to achieve an effective balance between "stable fixing" and "low-resistance free movement."

[0004] Therefore, how to construct an experimental fixation platform that can achieve high stability clamping, significantly reduce friction and additional constraint effects, and has high degree of freedom, high adaptability and multi-condition applicability without changing the constitutive and structural properties of the metamaterial being tested has become a key technical problem that urgently needs to be solved in the mechanical property testing of metamaterials. Summary of the Invention

[0005] Therefore, the present invention provides a novel multifunctional fixed experimental platform, including a support and guide component, a micro-damping movement component, a clamping and fixing component, and a precision control component; the support and guide component includes a fixed panel and precision guide rails; there is one set of fixed panels, which has a square structure in top view, with a through hole near the midpoint of the square edge for fixing the experimental platform to the experimental environment; there is one set of precision guide rails, which has a cross-shaped structure and is fixed on the fixed panel, arranged at the diagonal position of the square in the top view of the fixed panel.

[0006] There are four sets of micro-damping moving components, each set of which is arranged on a precision guide rail in the support and guide assembly; the clamping and fixing assembly includes an upper clamping and fixing device and a lower clamping and fixing device, with four sets of upper clamping and fixing devices and four sets of lower clamping and fixing devices; the precision control assembly includes a bottom moving arm, a middle moving arm, an upper moving arm, and connecting pins; there are four sets of each of the bottom moving arm, the middle moving arm, and the upper moving arm, and a total of sixteen sets of connecting pins; one end of the bottom moving arm is rotatably connected to the lower clamping and fixing device in the clamping and fixing assembly via the connecting pins, both ends of the middle moving arm are rotatably connected to the bottom moving arm and the upper moving arm respectively via the connecting pins, and the other end of the upper moving arm is connected to the upper clamping and fixing device in the clamping and fixing assembly via the connecting pins.

[0007] The precision guide rail includes guide grooves, arrayed fixing holes, and limiting baffles. The guide grooves are symmetrically distributed on both sides of the precision guide rail. The guide grooves are coated with grease to ensure that the sliding friction of the micro-damping moving component is minimized during operation. When the metamaterial structure under test is installed on the micro-damping moving component for experimentation, due to the inherent deformation properties of the metamaterial structure under test and the application of external forces, the metamaterial structure under test will drive the micro-damping moving component to make micro-displacements. The friction of this micro-displacement is negligible. In particular, when the deformation of the metamaterial under test is too large, the limiting baffles will limit the movement to prevent the metamaterial under test from being damaged.

[0008] The aforementioned micro-damping moving component includes a moving base and a guide rail slider structure. The moving base is installed in the guide groove of the precision guide rail via the guide rail slider structure. The moving base and the guide rail slider structure are an integral structure, and the two parts are connected by a rounded chamfer to enhance the strength and rigidity of the guide rail slider structure. The upper surface of the moving base is evenly covered with threaded holes to accommodate the conformal installation of the lower clamping and fixing device. When the clamping and fixing component is installed on the micro-damping moving component, it can be adjusted accordingly through the threaded holes, and its position changes according to the shape of the metamaterial being tested.

[0009] The clamping and fixing assembly includes both the upper clamping and fixing device and the lower clamping and fixing device, which are clamping base plates and fixing and mounting mechanisms. The upper surface of the clamping base plate is evenly covered with through holes, which can be used to fix and mount various shapes of metamaterial structures. The clamping base plate has the fixing and mounting mechanisms at its edge.

[0010] The bottom moving arm, the middle moving arm, and the upper moving arm can rotate 360° around the connecting pin. The friction between them and the connecting pin is small. The connecting pin has an extension structure on both sides of its head, an optical axis in the middle, and a threaded structure at its tail. When the metamaterial under test is being tested, as the deformation of the metamaterial under test is converted into a small displacement of the micro-damping moving component, the three moving arms included in the precision control component will also move accordingly to maintain the stability of the metamaterial under test.

[0011] This invention provides a novel multifunctional fixed experimental platform with advantages of simple structure and easy operation. It can be applied to the fixation of various complex metamaterial structures. The clamping and fixing components can accurately and efficiently fix the metamaterial under test, facilitating experiments. The micro-damped moving component solves the problem of experimental results being affected by surface friction on universal experimental platforms. By using the micro-damped moving component, the static friction on the metamaterial structure surface is replaced with sliding friction with an extremely small friction factor, without altering the metamaterial's structure itself. This greatly restores the experimental state of the metamaterial under test, making the test data more accurate. Furthermore, the precision control device can assist in fixing any structure with almost no resistance, having no impact on the detection of metamaterials and ensuring the authenticity and reliability of the experimental data. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a novel multifunctional fixed experimental platform provided in this invention.

[0013] Figure 2 This is a front view of a novel multifunctional fixed experimental platform structure provided in this invention.

[0014] Figure 3 This is a top view of a novel multifunctional fixed experimental platform structure provided in this invention.

[0015] Figure 4 This is a partial view of a novel multifunctional fixed experimental platform structure provided in this invention.

[0016] Figure 5 This is a schematic diagram of a novel multifunctional fixed experimental platform micro-damped moving component provided in this invention.

[0017] Figure 6 This is a schematic diagram of a novel multifunctional fixed experimental platform support and guidance component provided in this invention.

[0018] Figure 7 This is a schematic diagram of a specific embodiment of a novel multifunctional fixed experimental platform provided in this invention.

[0019] Among them, 1-support guide assembly; 11-fixed panel; 12-precision guide rail; 12a-guide groove; 12b-array fixing hole; 12c-limiting baffle; 2-micro damping moving assembly; 2a-moving base; 2b-guide rail slider structure; 3-clamping and fixing assembly; 31-upper clamping and fixing device; 31a-clamping base plate; 31b-fixed mounting mechanism; 32-lower clamping and fixing device; 4-precision control assembly; 41-bottom moving arm; 42-middle moving arm; 43-upper moving arm; 44-connecting pin. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 invention 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 invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Existing experimental platforms often struggle to achieve an effective balance between "stable fixation" and "low-resistance free movement." Constructing an experimental fixation platform that can achieve high-stability clamping, significantly reduce friction and additional constraint effects, and possess high degrees of freedom, high adaptability, and applicability to multiple working conditions, without altering the constitutive and structural properties of the metamaterial under test, has become a key technical problem that urgently needs to be solved in the testing of metamaterial mechanical properties.

[0025] In view of this, embodiments of the present invention disclose a novel multifunctional fixed experimental platform, as detailed in the appendix. Figure 1-7 A novel multifunctional fixed experimental platform includes a support and guide assembly 1, a micro-damping movement assembly 2, a clamping and fixing assembly 3, and a precision control assembly 4. The support and guide assembly 1 includes a fixed panel 11 and a precision guide rail 12. The fixed panel 11 consists of one set, which has a square structure in top view. A through hole is opened near the midpoint of the square edge to fix the experimental platform to the experimental environment. The precision guide rail 12 consists of one set, which has a cross-shaped structure and is fixed on the fixed panel 11, arranged at the diagonal position of the square in the top view of the fixed panel 11.

[0026] See appendix Figure 1 , attached Figure 5 The micro-damping moving assembly 2 comprises four sets, each set of which is arranged on the precision guide rail 12 in the support guide assembly 1; the clamping and fixing assembly 3 includes an upper clamping and fixing device 31 and a lower clamping and fixing device 32, with four sets of upper clamping and fixing devices 31 and four sets of lower clamping and fixing devices 32; the precision control assembly 4 includes a bottom moving arm 41, a middle moving arm 42, an upper moving arm 43, and a connecting pin 44; the bottom moving arm 41, the middle moving arm 42... There are four sets of upper moving arms 43 and a total of sixteen sets of connecting pins 44. One end of the bottom moving arm 41 is rotatably connected to the lower clamping and fixing device 32 in the clamping and fixing assembly 3 through the connecting pins 44. Both ends of the middle moving arm 42 are rotatably connected to the bottom moving arm 41 and the upper moving arm 43 respectively through the connecting pins 44. The other end of the upper moving arm 43 is connected to the upper clamping and fixing device 31 in the clamping and fixing assembly 3 through the connecting pins 44.

[0027] See appendix Figure 7The precision guide rail 12 includes a guide groove 12a, an array of fixing holes 12b, and a limiting baffle 12c. The guide groove 12a is symmetrically distributed on both sides of the precision guide rail 12. The guide groove 12a is coated with grease to ensure that the sliding friction of the micro-damping moving component 2 is minimized in the working state. When the metamaterial structure under test is installed on the micro-damping moving component 2 for experimentation, due to the inherent deformation properties of the metamaterial structure under test and the application of external force, the metamaterial structure under test will drive the micro-damping moving component 2 to make micro-displacement. The friction of this micro-displacement is negligible. In particular, when the deformation of the metamaterial under test is too large, the limiting baffle 12c will limit it to prevent the metamaterial under test from being damaged.

[0028] See appendix Figure 6 The micro-damping moving component 2 includes a moving base 2a and a guide rail slider structure 2b. The moving base 2a is installed in the guide groove 12a in the precision guide rail 12 through the guide rail slider structure 2b. The moving base 2a and the guide rail slider structure 2b are an integral structure, and the two parts are connected by rounded chamfers to enhance the strength and rigidity of the guide rail slider structure 2b. The upper surface of the moving base 2a is evenly covered with threaded holes, which, in conjunction with the conformal installation of the lower clamping and fixing device 32, allows for corresponding adjustments through the threaded holes when the clamping and fixing device 32 is installed on the micro-damping moving component 2. Its position changes according to the shape of the metamaterial being tested.

[0029] See appendix Figure 5 The clamping and fixing assembly 3 includes an upper clamping and fixing device 31 and a lower clamping and fixing device 32, both of which include a clamping base plate 31a and a fixing and mounting mechanism 31b. The upper surface of the clamping base plate 31a is evenly covered with through holes, which can be used to fix and install various shapes of metamaterial structures. The fixing and mounting mechanism 31b is located at the edge of the clamping base plate 31a.

[0030] The bottom moving arm 41, the middle moving arm 42, and the upper moving arm 43 can rotate 360° around the connecting pin 44. The friction between them and the connecting pin 44 is small. The connecting pin 44 has an extension structure on both sides of its head, an optical axis in the middle, and a threaded structure at its tail. When the metamaterial under test is being tested, as the deformation of the metamaterial under test is converted into a small displacement of the micro-damping moving component 2, the three moving arms included in the precision control component 4 will also move accordingly to maintain the stability of the metamaterial under test.

[0031] As attached Figure 7As shown, this is a specific embodiment of the present invention. When the sample to be tested, such as a negative Poisson's ratio metamaterial, is mounted on the lower clamping and fixing device 32, the negative Poisson's ratio metamaterial will contract inward due to the external force applied during the test. Because it is fastened by the upper clamping and fixing device 31 and the lower clamping and fixing device 32, it will drive the upper clamping and fixing device 31 and the lower clamping and fixing device 32 to move. The precision control component 4 also moves accordingly, thereby driving the micro-damping moving component 2 to perform micro-displacement. The friction between the micro-damping moving component 2 and the support guide component 1 is small, and the movement of the precision control component 4 is also almost frictionless. Therefore, the deformation displacement of the negative Poisson's ratio metamaterial is almost without external force, so the measured data is true and reliable data, avoiding the influence of the friction force on the surface of the universal experimental platform on the final experimental results.

[0032] This invention provides a novel multifunctional fixed experimental platform with advantages of simple structure and easy operation. It can be applied to the fixation of various complex metamaterial structures. The clamping and fixing component 3 can accurately and efficiently fix the metamaterial under test, facilitating experiments. The micro-damping moving component 2 solves the problem of experimental results being affected by surface friction on universal experimental platforms. Through the micro-damping moving component 2, the static friction on the surface of the metamaterial structure is changed to sliding friction with an extremely small friction factor, without changing the structure of the metamaterial itself. This greatly restores the experimental state of the metamaterial under test, making the test data more accurate. More importantly, the precision control device can assist in fixing any structure with almost no resistance, having no impact on the detection of metamaterials and ensuring the authenticity and reliability of the test experimental data.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0034] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel multifunctional fixed experimental platform includes a support and guidance assembly (1), a micro-damping movement assembly (2), a clamping and fixing assembly (3), and a precision control assembly (4); characterized in that, The support guide assembly (1) includes a fixed panel (11) and a precision guide rail (12); the fixed panel (11) has one set, which is square in top view, with a through hole at the midpoint of the square edge; the precision guide rail (12) has one set, which is cross-shaped and fixed on the fixed panel (11), arranged on the diagonal of the square in the top view of the fixed panel (11); the micro-damping moving assembly (2) has four sets, each set of which is arranged on the precision guide rail (12) in the support guide assembly (1); the clamping and fixing assembly (3) includes an upper clamping and fixing device (31) and a lower clamping and fixing device (32), the upper clamping and fixing device (31) has four sets, and the lower clamping and fixing device (32) has four sets; the precision control The control assembly (4) includes a bottom moving arm (41), a middle moving arm (42), an upper moving arm (43), and a connecting pin (44); there are four sets of each of the bottom moving arm (41), the middle moving arm (42), and the upper moving arm (43), and a total of sixteen sets of the connecting pin (44); one end of the bottom moving arm (41) is rotatably connected to the lower clamping and fixing device (32) in the clamping and fixing assembly (3) through the connecting pin (44), both ends of the middle moving arm (42) are rotatably connected to the bottom moving arm (41) and the upper moving arm (43) respectively through the connecting pin (44), and the other end of the upper moving arm (43) is connected to the upper clamping and fixing device (31) in the clamping and fixing assembly (3) through the connecting pin (44).

2. The novel multifunctional fixed experimental platform according to claim 1, characterized in that, The precision guide rail (12) in the support guide assembly (1) includes a guide groove (12a), an array fixing hole (12b) and a limiting baffle (12c). The guide groove (12a) is symmetrically distributed on both sides of the precision guide rail (12), and the guide groove (12a) is coated with grease.

3. A novel multifunctional fixed experimental platform according to claim 1, characterized in that, The movable base (2a) in the micro-damping movable component (2) is installed in the guide groove (12a) of the precision guide rail (12) through the guide rail slider structure (2b), and the upper surface of the movable base (2a) is evenly covered with threaded holes.

4. A novel multifunctional fixed experimental platform according to claim 1, characterized in that, In the clamping and fixing assembly (3), the upper surface of the clamping base plate (31a) is evenly covered with through holes, and the edge of the clamping base plate (31a) has a fixing and mounting mechanism (31b).

5. A novel multifunctional fixed experimental platform according to claim 1, characterized in that, The connecting pin (44) in the precision control device (4) has an extended structure on both sides of the head, an optical shaft in the middle, and a threaded structure at the tail.

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