Aramid honeycomb compression detection equipment with clamping function

Abstract

The utility model relates to compression resistance detection technical field discloses a kind of aramid honeycomb compression resistance detection equipment with clamping function, including box, the top of the inner chamber of box is provided with lifting drive device, and the drive end of lifting drive device is provided with the pressure block for exerting pressure to aramid honeycomb material;Supporting seat is further provided in the inner chamber of box.The utility model is pushed single vertical clamping plate by the horizontal moving device of being set, and the center is moved to two lateral clamping plates by the aid of connecting piece synchronous drive, forms one-way drive, four-way synchronous clamping, and aramid honeycomb material is fixed in supporting seat center position, avoids artificial positioning deviation, and ensures that the stress point of each detection is consistent;The sliding structure of first sliding groove group and second sliding groove group can be flexibly adjusted the clamping plate spacing according to the size of aramid honeycomb material, and lifting drive device drives pressure block uniform speed down pressure, cooperates the firm clamping of clamping plate, can prevent material from deviating, dumping or deformation, ensure the accuracy of detection data.

Description

Technical Field

[0001] This utility model relates to the field of compression testing technology, and in particular to a compression testing device for aramid honeycomb with clamping function. Background Technology

[0002] Aramid fiber honeycomb core material, as a core component of high-performance composite sandwich structures, is widely used in aerospace, rail transportation, and high-end equipment fields due to its unique three-dimensional hexagonal lattice structure and excellent material properties. Its manufacturing process uses high-strength aramid paper as raw material, and involves processes such as adhesive strip printing, layering, stretching, and curing to ultimately form a core material structure with regular honeycomb lattice cells. This structure endows aramid honeycomb with comprehensive advantages such as lightweight, high strength, impact resistance, high temperature resistance, and flame retardancy, making it a key material for ensuring the structural stability and performance reliability of high-end equipment.

[0003] Since the performance of aramid honeycomb directly determines the load-bearing capacity and safety redundancy of the sandwich structure, accurate compressive strength testing is a core step before product acceptance and engineering application. Key indicators such as compressive strength, elastic modulus, and compression ratio need to be obtained through testing to verify whether the material meets design requirements. However, existing aramid honeycomb compressive strength testing equipment still largely relies on manual operation in the sample clamping and positioning stage, presenting significant technical challenges. On the one hand, manual positioning has inherent subjectivity and uncertainty. Operators need to manually place the aramid honeycomb sample on the support of the testing equipment and rely on visual judgment to adjust the sample position to achieve "centering". However, due to factors such as operating experience and visual errors, the geometric center of the sample and the force center of the support are difficult to completely coincide each time, which can easily produce a positioning deviation of 0.5-2mm. At the same time, the clamping degree of the side clamps needs to be manually adjusted to fix the sample. The difference in the force of manually turning the adjustment parts will cause the clamping force to fluctuate, making it impossible to guarantee the consistency of clamping force for different samples or samples in the same batch.

[0004] On the other hand, the material properties of aramid honeycomb further amplify the drawbacks of manual operation. Although aramid honeycomb has high overall strength, its core cell walls are thin and its structure is brittle. Even slight positioning deviations or uneven clamping forces can trigger a chain of problems: positioning deviations can cause the stress point to deviate from the geometric center of the sample when the pressure block is applied, generating additional bending moments and causing the sample to bear a combined load of "axial pressure + bending stress" rather than a purely compressive load; excessive clamping force can directly crush the edge honeycomb core cells and damage the original structure of the sample, while insufficient clamping force can easily cause the sample to slip during the testing process. Both of these will introduce local stress concentration phenomena.

[0005] The aforementioned problems ultimately lead to significant dispersion in the test data, which fails to accurately reflect the inherent compressive strength of the material. More seriously, distorted test data may mislead performance evaluation. For example, "low compressive strength" caused by local stress concentration may cause qualified materials to be misjudged as unqualified products, resulting in cost waste. Or, "high compressive strength" caused by sample slippage may allow substandard materials to enter the application stage, creating potential structural safety hazards.

[0006] Therefore, the existing aramid honeycomb clamping and positioning method that relies on manual operation can no longer meet the stringent requirements of high-end fields for testing accuracy and data reliability. There is an urgent need for a technical solution that can achieve automatic, accurate, and stable clamping and positioning to eliminate the errors introduced by manual operation and ensure the authenticity and validity of the compression test results. Utility Model Content

[0007] The purpose of this invention is to solve the problems existing in the prior art by proposing an aramid honeycomb compression testing device with clamping function.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A clamping device for testing the compressive strength of aramid honeycomb material includes a housing. A lifting drive device is provided at the top of the inner cavity of the housing, and a pressure block for applying pressure to the aramid honeycomb material is provided at the drive end of the lifting drive device. The inner cavity of the box is also provided with a support base, and the support base is provided with a pair of first sliding groove groups and a pair of second sliding groove groups. A vertical clamping plate is slidably arranged in the first sliding groove group, and a horizontal clamping plate is arranged in the second sliding groove group. Both sides of the top of the vertical clamping plate are rotatably provided with connectors, and the other end of each connector is rotatably connected to the corresponding horizontal clamping plate. A horizontal moving device is provided on one side of the inner cavity of the box. The driving end of the horizontal moving device is connected to one of the vertical clamping plates, which is used to drive the vertical clamping plate to slide along the first slide rail group. The device also drives the two horizontal clamping plates to move synchronously along the second slide rail group towards the center of the support seat through the connecting piece, so as to achieve the clamping and positioning of the aramid honeycomb material.

[0009] Preferably, the two horizontal clamps are located between the two vertical clamps, and the length of the vertical clamps is longer than the length of the horizontal clamps.

[0010] Preferably, both the lifting drive device and the horizontal moving device are linear drive components, which are push rod motors, cylinders, electric cylinders, or hydraulic cylinders.

[0011] Preferably, a detection component, which is a video extensometer, is provided on the side wall of the inner cavity of the box.

[0012] Preferably, the first set of slide grooves extends along the length direction of the support base, the second set of slide grooves extends along the width direction of the support base, and the first set of slide grooves and the second set of slide grooves are vertically distributed on the top surface of the support base.

[0013] Preferably, one side wall of the enclosure is provided with an openable door, and the door has a transparent window.

[0014] Preferably, the transparent window is made of tempered glass, acrylic sheet or polycarbonate sheet.

[0015] Preferably, the side of the vertical clamping plate facing the center of the support seat and the side of the horizontal clamping plate facing the center of the support seat are both fixedly connected with a buffer layer.

[0016] Preferably, the buffer layer is integrally molded from natural rubber, nitrile rubber, or silicone.

[0017] Preferably, the first slide group includes two parallel first slides, and the second slide group includes two parallel second slides.

[0018] Compared with the prior art, the beneficial effects of this utility model are: This invention, through its horizontal moving device, can push a single vertical clamping plate, which, with the help of connecting parts, simultaneously drives two horizontal clamping plates to move towards the center, forming a unidirectional drive and four-way synchronous clamping. This automatically fixes the aramid honeycomb material in the center of the support base, avoiding manual positioning deviations and ensuring consistent stress points in each test. The sliding structure of the first and second sliding groove groups allows for flexible adjustment of the clamping plate spacing according to the dimensions (length and width) of the aramid honeycomb material. The lifting drive device drives the pressure block to press down at a uniform speed, which, combined with the stable clamping of the clamping plates, prevents the material from shifting, tilting, or deforming during the compression process, ensuring the accuracy of test data (such as compressive strength and yield strength). Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of an aramid honeycomb compression testing device with clamping function proposed in this utility model; Figure 2 This is a schematic diagram of the inner cavity of an aramid honeycomb compression testing device with clamping function proposed in this utility model; Figure 3 This is a schematic diagram of the support base structure of an aramid honeycomb compression testing device with clamping function proposed in this utility model.

[0020] In the diagram: 1. Box body; 2. Lifting drive device; 3. Pressure block; 4. Support base; 5. First slide rail group; 6. Second slide rail group; 7. Vertical clamping plate; 8. Horizontal clamping plate; 9. Connecting piece; 10. Horizontal moving device; 11. Detection component; 12. Box door; 13. Transparent window. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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 present 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.

[0025] Reference Figures 1-3A clamping device for testing the compressive strength of aramid honeycomb materials includes a housing 1, a lifting drive device 2 is provided at the top of the inner cavity of the housing 1, and a pressure block 3 for applying pressure to the aramid honeycomb material is provided at the drive end of the lifting drive device 2. The inner cavity of the box 1 is also provided with a support base 4, and the support base 4 is provided with a pair of first sliding groove groups 5 and a pair of second sliding groove groups 6. A vertical clamping plate 7 is slidably arranged in the first sliding groove group 5, and a horizontal clamping plate 8 is arranged in the second sliding groove group 6. Both sides of the top of the vertical clamping plate 7 are rotatably provided with connecting parts 9, and the other end of each connecting part 9 is rotatably connected to the corresponding horizontal clamping plate 8. A horizontal moving device 10 is provided on one side of the inner cavity of the box 1. The driving end of the horizontal moving device 10 is connected to one of the vertical clamping plates 7, which is used to drive the vertical clamping plate 7 to slide along the first slide group 5, and drive the two horizontal clamping plates 8 to move synchronously along the second slide group 6 towards the center of the support seat 4 through the connecting piece 9, so as to realize the clamping and positioning of the aramid honeycomb material. The lifting drive device 2 and the horizontal moving device 10 are both linear drive components, which are push rod motors, cylinders, electric cylinders or hydraulic cylinders.

[0026] This application utilizes a horizontal moving device 10 to push a single vertical clamping plate 7, which, with the help of a connecting piece 9, simultaneously drives two horizontal clamping plates 8 to move towards the center, forming a unidirectional drive and four-way synchronous clamping. This automatically fixes the aramid honeycomb material at the center of the support base 4, avoiding manual positioning deviations and ensuring consistent force points for each test. The sliding structure of the first slide group 5 and the second slide group 6 allows for flexible adjustment of the clamping plate spacing according to the dimensions (length, width) of the aramid honeycomb material. The lifting drive device 2 drives the pressure block 3 to press down at a uniform speed. Combined with the stable clamping of the clamping plates, this prevents the material from shifting, tilting, or deforming during the compression process, ensuring the accuracy of test data (such as compressive strength and yield strength). Compared with existing technologies, this application eliminates the need for a separate drive unit for the transverse clamping plate 8, simplifying the equipment structure and reducing costs and failure risks. Furthermore, it ensures that the vertical and transverse clamping plates 8 apply force to the center simultaneously, accurately positioning the aramid honeycomb material at the center of the support base 4. This avoids uneven distribution of compressive strength testing force caused by sample offset, thereby improving the accuracy of the test data from the root.

[0027] In the example of this application, a detection component 11 is provided on the side wall of the inner cavity of the housing 1, and the detection component 11 is a video extensometer.

[0028] As a preferred example of this application, the use of a video extensometer, compared to a traditional contact extensometer, avoids localized pressure damage caused by direct contact between the extensometer and the sample, protecting the original structure of the aramid honeycomb sample, and is especially suitable for honeycomb materials with high brittleness; the video extensometer can record the deformation of the entire surface of the sample in real time through image capture, not only collecting axial compression deformation data, but also monitoring whether the sample has abnormal deformations such as local bulging and cracking, providing more comprehensive information for compressive performance analysis; the layout installed on the side wall does not occupy the space of the support base 4 or the pressure block 3, avoiding interference with the clamping structure and the pressure application structure, and ensuring a smooth testing process.

[0029] In the example of this application, the first slide group 5 extends along the length direction of the support base 4, the second slide group 6 extends along the width direction of the support base 4, and the first slide group 5 and the second slide group 6 are vertically distributed on the top surface of the support base 4; the two transverse clamping plates 8 are located between the two vertical clamping plates 7, and the length of the vertical clamping plate 7 is longer than the length of the transverse clamping plate 8.

[0030] As a preferred example of this application, the above design can achieve full-dimensional clamping from the length and width of the aramid honeycomb sample in two vertical directions, preventing the sample from sliding in any horizontal direction during the test. On the other hand, the vertically distributed sliding groove group ensures that the clamping plate moves in a precise direction, so that the clamping force is applied evenly to the side of the sample, preventing the sample from being damaged prematurely due to excessive local stress caused by the clamping direction deviation, and ensuring that the test results can truly reflect the compressive strength of the sample.

[0031] In the example of this application, one of the side walls of the box 1 is provided with a door 12 that can be opened and closed, and the door 12 is provided with a transparent window 13.

[0032] As a preferred example of this application, the aforementioned openable and closable door 12 design facilitates sample loading and unloading without disassembling equipment components, thus improving testing efficiency. When the door 12 is closed, it forms a closed testing space, preventing fragments from flying out during the testing process caused by the breakage of the aramid honeycomb sample, thereby protecting the safety of the operators. The transparent window 13 allows real-time observation of the testing process inside the chamber 1, enabling monitoring of the sample status (such as whether there is obvious deformation or breakage) without opening the door 12, avoiding interference from the testing environment caused by opening the door (such as airflow affecting the pressure stability of the pressure block 3), and enabling timely detection of abnormalities and emergency shutdown, reducing equipment and sample wear and tear.

[0033] In the example of this application, the transparent window 13 is made of tempered glass, acrylic sheet or polycarbonate sheet.

[0034] As a preferred example of this application, the aforementioned material has high strength properties, which can withstand the impact of sample fragments and avoid safety hazards caused by window breakage; the material has high transparency and no obvious optical distortion, ensuring that operators can clearly observe the subtle deformation of the sample inside the chamber without affecting the monitoring effect of the detection process; tempered glass, polycarbonate plate, etc. are wear-resistant and anti-aging, and can still maintain good transparency after long-term use, extending the service life of the window and reducing equipment maintenance costs.

[0035] In the example of this application, the side of the vertical clamping plate 7 facing the center of the support base 4 and the side of the horizontal clamping plate 8 facing the center of the support base 4 are both fixedly connected with a buffer layer. As a preferred example of this application, the buffer layer can prevent hard contact between the clamping plate and the sample, prevent the clamping force from being too large and damaging the sample surface or the honeycomb cell structure, protect the original state of the sample, and ensure the authenticity of the test results; the buffer layer can increase the friction between the clamping plate and the sample, and even if the sample surface is uneven, it can conform to the sample through the deformation of the buffer layer, improve the clamping stability, and prevent the sample from slipping during the test; when pressure is applied during the pressure test, the buffer layer can absorb the local impact force and reduce the local breakage of the sample caused by uneven instantaneous force.

[0036] In the examples of this application, the buffer layer is integrally molded from natural rubber, nitrile rubber, or silicone. As a preferred example of this application, the one-piece molded structure is seamless and spliced, which avoids the buffer layer from falling off or cracking during long-term clamping and deformation, thus improving durability. Materials such as natural rubber and nitrile rubber have excellent elasticity and wear resistance, which can achieve buffer protection through elastic deformation and withstand clamping friction for a long time without damage, thus extending the service life of the buffer layer. The above materials have good chemical stability and will not react chemically with aramid honeycomb materials, thus avoiding sample contamination. At the same time, they are resistant to aging and temperature changes, and are suitable for different testing environments (such as room temperature and low temperature testing), ensuring stable buffering effect.

[0037] In the example of this application, the first slide group 5 includes two parallel first slides, and the second slide group 6 includes two parallel second slides.

[0038] As a preferred example of this application, the parallel groove can provide bidirectional support for the clamping plate, preventing the clamping plate from tilting or getting stuck during the sliding process, ensuring that the clamping plate always maintains a parallel posture with the side of the sample, and ensuring that the clamping plate and the sample fit tightly and are subjected to uniform force when clamped.

[0039] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A clamping device for testing the compressive strength of aramid honeycomb fibers, comprising a housing (1), characterized in that: The top of the inner cavity of the box (1) is provided with a lifting drive device (2), and the driving end of the lifting drive device (2) is provided with a pressure block (3) for applying pressure to the aramid honeycomb material. The inner cavity of the box (1) is also provided with a support base (4), and a pair of first sliding groove groups (5) and a pair of second sliding groove groups (6) are provided on the support base (4). A vertical clamping plate (7) is slidably provided in the first sliding groove group (5), and a horizontal clamping plate (8) is provided in the second sliding groove group (6). Both sides of the top of the vertical clamping plate (7) are rotatably provided with connectors (9), and the other end of each connector (9) is rotatably connected to the corresponding horizontal clamping plate (8). A horizontal moving device (10) is provided on one side of the inner cavity of the box (1). The driving end of the horizontal moving device (10) is connected to one of the vertical clamping plates (7) to drive the vertical clamping plate (7) to slide along the first slide group (5) and drive the two horizontal clamping plates (8) to move synchronously along the second slide group (6) towards the center of the support seat (4) through the connecting piece (9) to achieve clamping and positioning of the aramid honeycomb material.

2. The aramid honeycomb compression testing device with clamping function according to claim 1, characterized in that, The two horizontal clamps (8) are located between the two vertical clamps (7), and the length of the vertical clamps (7) is longer than the length of the horizontal clamps (8).

3. The aramid honeycomb compression testing device with clamping function according to claim 2, characterized in that, Both the lifting drive device (2) and the horizontal moving device (10) are linear drive components, which are push rod motors, cylinders, electric cylinders or hydraulic cylinders.

4. The aramid honeycomb compression testing device with clamping function according to claim 3, characterized in that, A detection component (11) is provided on the side wall of the inner cavity of the housing (1), and the detection component (11) is a video extensometer.

5. The aramid honeycomb compression testing device with clamping function according to claim 1, characterized in that, The first chute group (5) extends along the length direction of the support base (4), and the second chute group (6) extends along the width direction of the support base (4). The first chute group (5) and the second chute group (6) are vertically distributed on the top surface of the support base (4).

6. The aramid honeycomb compression testing device with clamping function according to claim 1, characterized in that, The box (1) has an openable door (12) on one of its side walls, and the door (12) has a transparent window (13).

7. The aramid honeycomb compression testing device with clamping function according to claim 6, characterized in that, The transparent window (13) is made of tempered glass, acrylic sheet or polycarbonate sheet.

8. The aramid honeycomb compression testing device with clamping function according to claim 1, characterized in that, The vertical clamping plate (7) facing the center of the support base (4) and the horizontal clamping plate (8) facing the center of the support base (4) are both fixedly connected with a buffer layer.

9. The aramid honeycomb compression testing device with clamping function according to claim 8, characterized in that, The buffer layer is integrally molded from natural rubber, nitrile rubber, or silicone.

10. The aramid honeycomb compression testing device with clamping function according to claim 1, characterized in that, The first slide group (5) includes two parallel first slides, and the second slide group (6) includes two parallel second slides.

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