Cuboid jig for a vibration table and vibration table having the same

Abstract

The utility model provides a cubic clamp for vibration table and has its vibration table, the cubic clamp includes roof, bottom plate and four side plates, four the side plate is enclosed into square frame, the roof is located square frame's top surface, the bottom plate is located square frame's bottom surface, the roof, bottom plate and four side plates constitute a cubic with hollow cavity, four the thickness of side plate is identical, the thickness of roof and bottom plate is greater than the thickness of side plate, set up four equal thickness side plate, the thick roof and the thick bottom plate, have solved the problem of different area response acceleration difference of traditional clamp, simultaneously, have overcome the problem that traditional casting type clamp has casting defect, have the remarkable advantage in the aspect of test accuracy and stability, can provide more reliable data for test piece mechanics environmental reliability test.

Description

Technical Field

[0001] This utility model relates to the technical field of vibration testing devices, specifically to a cubic clamp for a vibration table and a vibration table having the same. Background Technology

[0002] In the field of mechanical environment reliability testing, cubic fixtures are mainly used to fix and support the object under test in vibration experiments, ensuring that it maintains a stable posture and position during vibration and uniformly transmits vibration energy, so that the vibration excitation of each part of the object under test meets the experimental requirements. They are commonly used in vibration performance testing of products in aerospace, automobile manufacturing, electronic equipment and other fields, and are an indispensable and important component of vibration test systems.

[0003] Traditional cubic fixtures typically employ a bowl-shaped cast base with a cover plate, and all six sides are of equal thickness. The bottom surface is rigidly connected to the vibration table's excitation output surface, while the other five sides are used to clamp the specimen. However, this traditional design suffers from uneven mechanical response. Due to the equal thickness of the six sides, the top mounting surface directly bears the vibration excitation during vibration transmission, and its large area leads to a significant deviation in its response acceleration compared to the sides. Furthermore, the response acceleration varies across different areas of the top mounting surface. In addition, the bowl-shaped cast base and cover plate structure of traditional cubic fixtures is prone to casting defects such as sand holes and porosity due to the casting process. These defects cause localized stress concentration, reducing the fixture's structural strength and dynamic stability. Under long-term high-frequency vibration, fatigue cracks can easily develop at these defective areas, further affecting vibration transmission performance. These issues introduce additional vibration transmission losses, causing deviations between the actual vibration spectrum experienced by the specimen and the set values, impacting the effectiveness of product reliability verification, especially in high-standard testing scenarios such as aerospace and military applications. Therefore, there is an urgent need to optimize and improve the structure and manufacturing technology of cubic fixtures. Summary of the Invention

[0004] The purpose of this invention is to provide a cubic clamp for a vibration table and a vibration table having the same, so as to solve the above-mentioned problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A cubic clamp for a vibration table includes a top plate, a bottom plate, and four side plates. The four side plates enclose a square frame. The top plate is disposed on the top surface of the square frame, and the bottom plate is disposed on the bottom surface of the square frame. The top plate, the bottom plate, and the four side plates form a cube with a hollow cavity. The four side plates have the same thickness, and the thickness of the top plate and the bottom plate is greater than the thickness of the side plates.

[0007] As a further improvement of this utility model, the thickness of the bottom plate is greater than or equal to the thickness of the top plate.

[0008] As a further improvement of the present invention, the four side plates are identical and connected end to end, and the connection structure between adjacent side plates is consistent. Each side plate includes a top surface, a bottom surface, a first end surface, a second end surface, an inner surface, and a mounting surface. The first end surface of one side plate abuts against the inner surface of an adjacent side plate, and the mounting surface of the side plate is flush with the second end surface of the side plate that abuts against its first end surface.

[0009] As a further improvement of this utility model, the adjacent side plates are connected by screws, the top plate and the side plates are connected by screws, and the bottom plate and the side plates are connected by screws.

[0010] As a further improvement of this utility model, a number of specimen connection holes are provided on the side plate and top plate facing the outside of the cube.

[0011] As a further improvement of this utility model, the test piece connection hole is a threaded hole.

[0012] As a further improvement of this utility model, a plurality of mounting holes are provided on the base plate, which are used to connect the base plate to the vibration output end of the vibration table.

[0013] As a further improvement of this utility model, a number of stiffening plates are provided in the hollow cavity.

[0014] As a further improvement of this utility model, the top plate, bottom plate and side plate are made of aluminum alloy plate or magnesium alloy plate.

[0015] A vibration table includes an excitation generator, and a cubic clamp for the vibration table as described above is provided at the output end of the excitation generator.

[0016] The beneficial effects of this utility model are as follows:

[0017] The above structure, with four side plates of equal thickness, a thickened top plate, and a thickened bottom plate, solves the problem of different acceleration response areas in traditional fixtures. At the same time, it overcomes the problem of casting defects in traditional casting fixtures, and has significant advantages in terms of test accuracy and stability. It can provide more reliable data for the mechanical environment reliability test of specimens. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the cubic clamp;

[0019] Figure 2This is a schematic diagram of the internal structure of the cube clamp;

[0020] Figure 3 This is a schematic diagram of the side panel assembly.

[0021] Wherein: 1-hollow cavity, 2-top plate, 3-bottom plate, 4-side plate, 401-first side plate, 402-second side plate, 403-third side plate, 404-fourth side plate, F1-top surface, F2-bottom surface, F3-first end surface, F4-second end surface, F5-inner surface, F6-mounting surface, 5-clamp connection hole, 6-screw, 7-test piece connection hole, 8-mounting hole. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0023] If the description of this utility model involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.), then the directions involved need to be defined. For example, "To clearly express the position and direction described in this utility model, the operator of the instrument is used as a reference, the end closer to the operator is the proximal end, and the end farther from the operator is the distal end." Or, the paper can be used as a reference. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, then this definition is not required.

[0024] A cubic clamp for a vibration table, such as Figures 1-2As shown, the structure includes a top plate 2, a bottom plate 3, and four side plates 4. The four side plates 4 are joined together to form a square frame. The top plate 2 is located on the top surface F1 of the square frame, and the bottom plate 3 is located on the bottom surface F2 of the square frame. The top plate 2, bottom plate 3, and four side plates 4 form a cube with a hollow cavity 1. The four side plates 4 have the same thickness, but the thickness of the top plate 2 is greater than the thickness of the side plates 4, and the thickness of the bottom plate 3 is greater than the thickness of the side plates 4. The thickness referred to here is defined as the distance from the surface of the top plate 2 / bottom plate 3 / side plate 4 facing away from the hollow cavity 1 to the surface facing the hollow cavity 1. The design of the equal-thickness side plates 4, thickened top plate 2, and thickened bottom plate 3 optimizes the mechanical properties of the cubic fixture. The uniform thickness of the four side plates 4 provides stable mechanical support during vibration, ensuring consistent response across different parts of the side plates and improving the uniformity of acceleration, thus resulting in more accurate test results. The thickened top plate 2 and bottom plate 3 enhance the strength and stability of the structure. The thickened top plate 2 better supports the specimen and disperses vibration energy, reducing differences in acceleration response across different areas of the top plate 2. The thickened bottom plate 3 provides a stable connection, enhancing the connection stability with the vibration output end of the vibration table and ensuring the entire cubic fixture is stable and reliable during vibration.

[0025] Furthermore, the thickness of the base plate 3 can be greater than or equal to the thickness of the top plate 2. Typically, the base plate 3 and the top plate 2 are of equal thickness, which can achieve high-fidelity transmission of multi-directional vibration. If the thickness of the base plate 3 is greater than the thickness of the top plate 2, the stiffness of the contact end with the vibration table can be increased, energy reflection can be reduced, and the loss of vibration energy transmission can be reduced.

[0026] As an embodiment of this utility model, the four side plates 4 are identical and connected end to end, and the connection structure between adjacent side plates 4 is consistent. Each side plate 4 includes a top surface F1, a bottom surface F2, a first end surface F3, a second end surface F4, an inner surface F5, and a mounting surface F6. The top surface F1 is the side plate 4 facing the top plate 2, the bottom surface F2 is the side plate 4 facing the bottom plate 3, the inner surface F5 is the side plate 4 facing the hollow cavity 1, and the mounting surface F6 is the side plate 4 facing away from the hollow cavity 1. The mounting surface F6 is used to mount the specimen. The first end surface F3 and the second end surface F4 are the other two surfaces of the side plate 4. The first end surface F3 and the second end surface F4 are opposite each other. The first end surface F3 of one side plate 4 abuts against the inner surface F5 of an adjacent side plate 4. The mounting surface F6 of the side plate 4 is flush with the second end surface F4 of the side plate 4 that abuts against its first end surface F3. Among them, the four side plates 4 are identical, that is, the four side plates 4 have the same size. Here, the size is identical, which means that the length, width and height of the side plates 4 are completely the same, and the four side plates 4 are made of the same material.

[0027] When the panels are assembled, the four side panels 4 are sequentially joined along the same direction on the side (all clockwise or all counterclockwise) to form a closed-loop structure. Specifically, as shown... Figure 3 As shown, the four side plates 4 are defined as the first side plate 401, the second side plate 402, the third side plate 403, and the fourth side plate 404. Taking the first side plate 401 as an example, the first end face F3 of the first side plate 401 tightly abuts against the inner side face F5 of the second side plate 402, and the mounting surface F6 of the first side plate 401 is flush with the second end face F4 of the second side plate 402. The second end face F4 of the first side plate 401 is flush with the mounting surface F6 of the fourth side plate 404 to avoid assembly stress. The connection structure of the second side plate 402 and the third side plate 403 is the same as the connection structure of the first side plate 401 and the second side plate 402. The connection structure of the third side plate 403 and the fourth side plate 404 is the same as the connection structure of the first side plate 401 and the second side plate 402. The connection structure of the fourth side plate 404 and the first side plate 401 is the same as the connection structure of the first side plate 401 and the second side plate 402. These details are not elaborated here.

[0028] The side surface of the top plate 2 (the surface near the mounting surface F6 of the side plate 4) is flush with the mounting surface F6 of the side plate 4, and the side surface of the bottom plate 3 (the surface near the mounting surface F6 of the side plate 4) is flush with the mounting surface F6 of the side plate 4. This enclosing splicing method ensures that the sides of the cubic clamp are flat and the circumferential stiffness is uniform, resulting in consistent dynamic response.

[0029] Regarding installation and connection, a clamp connection hole 5 is provided on the end face of the side plate 4 that abuts against the adjacent side plate 4. The clamp connection hole 5 penetrates the adjacent side plate 4, and the adjacent side plates 4 are connected by screws 6 passing through the clamp connection hole 5. A clamp connection hole 5 is provided on the top surface F1 of the side plate 4. The clamp connection hole 5 penetrates the top plate 2, and the top plate 2 and the side plate 4 are connected by screws 6 passing through the clamp connection hole 5. A clamp connection hole 5 is provided on the bottom surface F2 of the side plate 4. The clamp connection hole 5 penetrates the bottom plate 3, and the bottom plate 3 and the side plate 4 are connected by screws 6 passing through the clamp connection hole 5. During assembly, the four side plates 4 are first placed in predetermined positions and initially fixed using screws 6 through the pre-machined clamp connection holes 5. After adjusting the verticality and flatness of each side plate 4, the screws 6 are tightened. Then, the top plate 2 and bottom plate 3 are installed respectively, and are also firmly connected using screws 6. The assembly method of connecting the plates with screws 6 replaces the traditional casting structure, avoiding casting defects such as sand holes and air holes that are easily generated during the casting process, thereby ensuring that the entire cubic clamp structure is tightly and stably connected.

[0030] Regarding the selection of materials, the top plate 2, bottom plate 3, and side plate 4 are made of high-density lightweight alloy materials, such as aluminum alloy or magnesium alloy. High-density materials increase vibration wave velocity, ensuring efficient transmission of vibration energy. Using dense materials to manufacture the plates and assembling them into fixtures allows for strict control of dimensional accuracy, ensuring the fit between the plates, maintaining consistency in vibration transmission, and further improving the reliability and stability of the test.

[0031] In one embodiment of this utility model, a plurality of specimen connection holes 7 are provided on the surfaces of the side plate 4 and the top plate 2 that are opposite to the hollow cavity 1. The specimen connection holes 7 are used to connect the specimen to the side plate 4 / top plate 2. Specifically, the specimen connection holes 7 are threaded holes.

[0032] As an embodiment of this utility model, a plurality of mounting holes 8 are provided on the base plate 3. The mounting holes 8 are used to connect the base plate 3 and the vibration output end of the vibration table, thereby transmitting vibration to the other five mounting surfaces. Specifically, the mounting holes 8 can be through holes.

[0033] As one embodiment of this utility model, a plurality of stiffening plates are provided in the hollow cavity 1, and the plurality of stiffening plates are evenly distributed in the hollow cavity 1 to further increase the strength and stability of the cubic clamp.

[0034] This utility model also provides a vibration table, which includes an excitation generating device, and a cubic clamp for the vibration table as described above is provided at the output end of the excitation generating device.

[0035] Compared with traditional fixtures, the cubic fixture for vibration table and the vibration table with it provided by this utility model solves the problem of different response acceleration in different areas of traditional fixtures by setting four side plates 4 of equal thickness, a thickened top plate 2 and a thickened bottom plate 3. At the same time, it overcomes the problem of casting defects in traditional casting fixtures. It has significant advantages in terms of test accuracy and stability, and can provide more reliable data for the mechanical environment reliability test of specimens.

[0036] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0037] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cubic clamp for a vibration table, characterized in that: It includes a top plate (2), a bottom plate (3) and four side plates (4). The four side plates (4) enclose a square frame. The top plate (2) is located on the top surface of the square frame, and the bottom plate (3) is located on the bottom surface of the square frame. The top plate (2), the bottom plate (3) and the four side plates (4) form a cube with a hollow cavity (1). The four side plates (4) have the same thickness. The thickness of the top plate (2) and the bottom plate (3) is greater than the thickness of the side plates (4).

2. The cubic clamp for a vibration table according to claim 1, characterized in that: The thickness of the bottom plate (3) is greater than or equal to the thickness of the top plate (2).

3. The cubic clamp for a vibration table according to claim 1, characterized in that: The four side plates (4) are identical and connected end to end. The connection structure between adjacent side plates (4) is consistent. Each side plate (4) includes a top surface (F1), a bottom surface (F2), a first end surface (F3), a second end surface (F4), an inner surface (F5), and a mounting surface (F6). The first end surface (F3) of one side plate (4) abuts against the inner surface (F5) of an adjacent side plate (4). The mounting surface (F6) of the side plate (4) is flush with the second end surface (F4) of the side plate (4) whose first end surface (F3) abuts against.

4. The cubic clamp for a vibration table according to claim 3, characterized in that: The adjacent side plates (4) are connected by screws (6), the top plate (2) is connected to the side plate (4) by screws (6), and the bottom plate (3) is connected to the side plate (4) by screws (6).

5. The cubic clamp for a vibration table according to claim 3, characterized in that: Several specimen connection holes (7) are provided on the surfaces of the side plate (4) and top plate (2) facing the outside of the cube.

6. The cubic clamp for a vibration table according to claim 5, characterized in that: The test piece connection hole (7) is a threaded hole.

7. The cubic clamp for a vibration table according to claim 1, characterized in that: A plurality of mounting holes (8) are provided on the base plate (3), which are used to connect the base plate (3) to the vibration output end of the vibration table.

8. The cubic clamp for a vibration table according to claim 1, characterized in that: Several stiffening plates are provided inside the hollow cavity (1).

9. The cubic clamp for a vibration table according to claim 3, characterized in that: The top plate (2), bottom plate (3) and side plate (4) are made of aluminum alloy or magnesium alloy.

10. A vibration table, characterized in that: It includes a vibration generating device, and a cubic clamp for a vibration table as described in any one of claims 1 to 9 is provided at the output end of the vibration generating device.

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