An adjustable structural vibration test fixture

Abstract

The application discloses a kind of adjustable structural vibration test clamps, it is related to vibration test tooling technical field.The clamp includes base, front support, upper guide rail, rear support and transmission mechanism.The front support is fixed to the front end of base;Upper guide rail is slidably arranged on base, and rear support is arranged on upper guide rail;Transmission mechanism drives upper guide rail and rear support to slide along base.V-shaped guide structure is provided between base and upper guide rail to ensure accurate movement trajectory;Base is provided with T-shaped slot, and position locking is realized by cooperating with positioning screw and positioning nut.The application adjusts the position of rear support through gear and rack transmission, breaks the fixed size limit of traditional special fixture, and realizes "one installation multiple use".The clamp is simple and convenient to clamp, labor-saving to adjust, and reliable to lock.When replacing different length cylindrical shell products, the clamp does not need to be repeatedly disassembled and assembled, effectively reduces tooling cost, and can faithfully transmit vibration energy, fully meets the product anti-vibration reliability test demand.

Description

Technical Field

[0001] This invention relates to the field of vibration testing fixtures and tools, specifically to an adjustable structural vibration testing fixture. Background Technology

[0002] Vibration testing simulates the vibration environment throughout a product's entire lifecycle, exposing potential defects in its structure, components, or performance in advance, ensuring the product's eventual stable and reliable operation. When conducting vibration tests with existing equipment, a single fixture typically only meets the requirements for products of fixed dimensions. When testing products of varying lengths (such as multiple cylindrical shells with the same outer diameter but different lengths), it is necessary to redesign and manufacture specialized fixtures, which is time-consuming, labor-intensive, and increases tooling costs.

[0003] Furthermore, since the stiffness, natural frequency, and damping of the vibration test fixture have the most significant impact on its vibration characteristics, the interface relationship between the fixture and the vibration table, the economic efficiency of fixture manufacturing, and ultimately the rationality of the fixture's transmission characteristics must be verified through testing. Frequent fixture changes not only increase costs but may also lead to distortion in vibration energy transmission. Therefore, it is necessary to comprehensively consider the characteristics of the fixture, the product, and the test table to design a vibration test fixture with a reasonable external structure, applicable to different lengths, and easy to install and limit, achieving "one fixture for multiple uses" and transmitting the motion and energy of the vibration table to the specimen without distortion, thus achieving the purpose of vibration testing. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable structural vibration test fixture that is easy to use and suitable for different lengths when redesigning fixtures for vibration testing of products of different lengths, breaking the limitation of fixed size and realizing "one fixture for multiple uses".

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable structural vibration testing fixture, comprising: Base; A front support is fixedly disposed at the front end of the base, and the front support is provided with a first connection structure for connecting to the front end of the cylindrical shell; The lower guide rail is fixedly mounted on the base; The upper guide rail is slidably disposed above the lower guide rail; The rear support is fixedly mounted on the upper guide rail, and the rear support is provided with a second connection structure for connecting to the rear end of the cylindrical shell. A transmission mechanism is disposed between the base and the upper guide rail, and is used to drive the upper guide rail to slide relative to the lower guide rail along the length direction; A positioning mechanism is used to lock and fix the upper guide rail and the lower guide rail after the upper guide rail slides to the target position.

[0006] Usage process: Step 1: Connect the fixture to the test bench Connect the base to the corresponding holes on the vibration test bench through its mounting holes, and fix the base to the vibration test bench. The front support is fixedly installed at the front end of the base, and the lower guide rail is fixedly installed on the base.

[0007] Step 2: Install the upper guide rail and rear support Place the upper guide rail above the lower guide rail, aligning them. Install the transmission mechanism and rear support (excluding the upper clamp) onto the upper guide rail, allowing it to slide relative to the lower guide rail.

[0008] Step 3: Initial adjustment of the rear support position Based on the length of the test cylindrical shell, the rear support is driven to slide along the upper guide rail through the transmission mechanism, moving the rear support to the approximate target position.

[0009] Step 4: Install the product front end The front end of the test cylindrical shell is connected to the front support to reliably fix the front end of the product to the fixture. The other end of the product is supported by the lower support in the rear support.

[0010] Step 5: Precisely adjust and lock the position Based on the product's center of gravity, the rear support is finely adjusted to a suitable position along the upper guide rail via a transmission mechanism, and the upper and lower guide rails are locked and fixed to prevent displacement of the rear support during the test.

[0011] Step Six: Install the clamps to complete the clamping process. Place the upper clamp on top of the cylindrical shell under test, and reliably connect the upper clamp to the lower support via threaded connection to form a complete annular clamping space, thus clamping and fixing the cylindrical shell. At this point, the product installation is complete, and vibration testing can begin.

[0012] Preferably, the base has mounting holes for connecting to the vibration test bench, for fixing the base to the vibration test bench.

[0013] Preferably, the transmission mechanism includes a hand crank, a main shaft, a transmission gear, bearings, and a rack; the rack is fixed along its length to the base or the lower guide rail, the main shaft is longitudinally mounted on the upper guide rail via bearings at both ends, a hand crank is provided at the right end of the main shaft, and the transmission gear meshes with the rack for transmission; Preferably, the front support is provided with a wedge ring connection structure for wedge ring connection with the inner stop section at the front end of the cylindrical shell product.

[0014] Preferably, a V-shaped guide structure is provided between the upper guide rail and the lower guide rail.

[0015] Preferably, the lower guide rail is provided with a T-shaped groove, and the positioning mechanism includes a positioning screw and a positioning nut. The head of the positioning screw is slidably disposed in the T-shaped groove, and the shank of the positioning screw passes through the upper guide rail and is threadedly engaged with the positioning nut.

[0016] Preferably, the rear support includes a lower support and an upper clamp; the lower support is fixed to the upper guide rail, and the upper clamp is detachably connected to the lower support by fasteners to hold and fix the rear end of the cylindrical shell product.

[0017] Preferably, the V-shaped guide structure includes a V-shaped guide groove disposed on the lower guide rail and a V-shaped guide protrusion disposed at the bottom of the upper guide rail.

[0018] Compared with the prior art, the present invention has the following advantages: 1. Break size limitations and reduce tooling costs: It can adapt to the testing needs of products with different lengths and sizes, realize multiple uses with one fixture, and eliminate the need to design special fixtures for different products.

[0019] 2. Precise adjustment and effortless operation: The upper and lower guide rails are equipped with a V-shaped guide structure to ensure the accuracy of the motion trajectory during transmission and avoid left and right deviations during linear reciprocating motion; the hand crank and gear rack structure are effortless and easy to operate.

[0020] 3. Integrated adjustment and locking for reliable connection: The addition of a transmission mechanism, positioning screws, positioning nuts, and other components enables rapid locking of the target length via a T-groove and positioning assembly, preventing the product from shaking during testing.

[0021] 4. Improved testing efficiency: The rear support is an adjustable structure. When changing products of different sizes on the test bench, only the position of the rear support needs to be adjusted, avoiding the tedious process of repeatedly disassembling and assembling the fixture and the test bench, saving time and effort, and transmitting vibration energy without distortion. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the adjustable vibration test fixture of the present invention.

[0025] Figure 2 This is a front view of the front support of the adjustable vibration test fixture of the present invention.

[0026] Figure 3 This is a left view of the front support of the adjustable vibration test fixture of the present invention.

[0027] Figure 4 This is a schematic diagram of the rear support structure of the adjustable vibration test fixture of the present invention.

[0028] Figure 5 This is a front view of the lower guide rail of the adjustable vibration test fixture of the present invention.

[0029] Figure 6 This is a right view of the lower guide rail of the adjustable vibration test fixture of the present invention.

[0030] In the diagram: 1-base, 2-front support, 3-rear support, 4-upper guide rail, 5-lower guide rail, 6-upper clamp, 7-lower support, 8-transmission mechanism, 9-rack, 10-positioning screw, 11-positioning nut, 12-V-type guide structure, 13-T-shaped groove, 14-hand crank, 15-transmission gear, 16-main shaft, 17-bearing, 18-wedge ring connection structure. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0032] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0034] The specific embodiments of the present invention will be described in detail below.

[0035] like Figures 1 to 3 As shown in the figure, the adjustable vibration test fixture provided in this embodiment mainly consists of a base 1, a front support 2, a lower guide rail 5, an upper guide rail 4, a transmission mechanism 8, and a rear support 3.

[0036] Overall structure: The base 1 is fitted with mounting holes according to the connection holes of the vibration test bench and is fixed to the vibration test bench frame by threaded connection. The front support 2 is fixed to the front end of the base 1 by threaded connection. The lower guide rail 5 is fixedly mounted on the base 1, and the upper guide rail 4 is slidably mounted above the lower guide rail 5. The transmission mechanism 8 and the rear support 3 are mounted on the upper guide rail 4, and the rear support 3 can slide linearly along the upper guide rail 4.

[0037] Front support structure: like Figure 2 and Figure 3 As shown, the front support 2 is equipped with a wedge ring connection structure 18, which is used for wedge ring connection with the inner stop section of the cylindrical shell. The wedge ring connection method can ensure the stability of the product's posture during vibration, while taking into account both clamping efficiency and fixing flexibility.

[0038] Rear support structure: like Figure 4 As shown, the rear support 3 mainly consists of a lower support 7 and an upper clamp 6. After confirming the position of the lower support 7, the upper clamp 6 is placed on the test product, and the upper clamp 6 is reliably connected to the lower support 7 by screws, thereby clamping and fixing the cylindrical shell.

[0039] Guide rails and limiting structures: like Figure 5 and Figure 6 As shown, the lower guide rail 5 has dedicated T-shaped grooves 13 on both sides. The head of the positioning screw 10 is placed in the T-shaped groove 13, and the positioning screw 10 can move simultaneously with the upper guide rail 4. After the position of the upper guide rail 4 is fixed, the upper guide rail 4 and the lower guide rail 5 are locked by tightening the positioning nut 11. A V-shaped guide structure 12 is provided between the upper guide rail 4 and the lower guide rail 5 to provide linear constraint for the sliding of the rear support 3 and prevent left and right deviation during linear reciprocating motion.

[0040] Transmission mechanism: The transmission mechanism 8 mainly consists of a transmission gear 15, a rack 9, a main shaft 16, a hand crank 14, and a bearing 17. The rack 9 is fixedly mounted on the base 1. The transmission gear 15 meshes with the rack 9. The main shaft 16 is connected to the transmission gear 15. The hand crank 14 is mounted on the right side of the main shaft 16, and the bearing 17 supports the main shaft 16. Rotating the hand crank 14 drives the main shaft 16 and the transmission gear 15 to rotate. The transmission gear 15 meshes with the rack 9, converting the rotational motion of the hand crank 14 into the linear motion of the rear support 3. This causes the rear support 3 to slide along the upper guide rail 4, thus adjusting the position of the rear support 3.

[0041] The specific implementation and operation process is as follows: Step 1: Follow Figure 1 The assembly relationship is such that the base 1, front support 2, and lower guide rail 5 of the adjustable structural vibration test fixture are fixed to the vibration test bench by threaded connection. Step 2: After fixing the transmission mechanism 8 and the rear support 3 (excluding the upper clamp 6) to the upper guide rail 4 with bolts, place them on the lower guide rail 5. Make sure the upper guide rail 4 and the lower guide rail 5 are aligned to ensure that the V-shaped guide structure 12 is properly engaged. Step 3: Based on the length of the test product, rotate the hand crank 14 to make a preliminary adjustment to the position of the rear support 3 (excluding the upper clamp 6) through the transmission mechanism 8; Step 4: Connect the inner stop section of the test product to the front support 2 reliably through the wedge ring connection structure 18, and support the other end with the rear support 3; Step 5: Based on the product's center of gravity, rotate the hand crank 14 to move the rear support 3 (excluding the upper clamp 6) to the corresponding position via the transmission mechanism 8. Then, tighten the positioning screw 10 and positioning nut 11 that connect the upper guide rail 4 and the lower guide rail 5 to lock the upper guide rail 4 and the lower guide rail 5. Step 6: Place the upper clamp 6 in the rear support 3 onto the test product, and reliably connect the upper clamp 6 to the lower support 7 through threaded connection, then the relevant vibration test can be started; Step 7: When testing products of different lengths, simply loosen the positioning nut 11, rotate the hand crank 14 through the rear support 3 position, and relock the upper guide rail 4 and lower guide rail 5 with the positioning screw 10 and positioning nut 11. There is no need to repeatedly disassemble the connection between the fixture and the test bench.

[0042] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. An adjustable structural vibration testing fixture, characterized in that, include: Base (1); The front support (2) is fixedly mounted on the base (1); The lower guide rail (5) is fixedly mounted on the base (1), and T-shaped grooves (13) are provided on both sides of the lower guide rail (5). The upper guide rail (4) is slidably disposed above the lower guide rail (5); The rear support (3) is fixedly mounted on the upper guide rail (4), and the rear support (3) is provided with a second connection structure for connecting with the rear end of the cylindrical shell; A transmission mechanism (8) is disposed between the base (1) and the upper guide rail (4) for driving the upper guide rail (4) to slide relative to the lower guide rail (5) along the length direction; The positioning mechanism is used to lock and fix the upper guide rail (4) and the lower guide rail (5) after the upper guide rail (4) slides to the target position.

2. The adjustable structural vibration test fixture according to claim 1, characterized in that, The base (1) has an installation hole for connecting to the vibration test bench, which is used to fix the base (1) on the vibration test bench.

3. The adjustable structural vibration test fixture according to claim 1, characterized in that, The transmission mechanism (8) includes a hand crank (14), a main shaft (16), a transmission gear (15), a bearing (17), and a rack (9); the rack (9) is fixed along the length direction on the base (1) or the lower guide rail (5), the main shaft (16) is longitudinally mounted on the upper guide rail (4) through the bearings (17) at both ends, the right end of the main shaft (16) is provided with a hand crank (14), and the transmission gear (15) meshes with the rack (9) for transmission.

4. The adjustable structural vibration test fixture according to claim 1, characterized in that, The front support (2) is provided with a wedge ring connection structure (18) for wedge ring connection with the inner stop section at the front end of the cylindrical shell product.

5. An adjustable structural vibration testing fixture according to claim 1, characterized in that, A V-shaped guide structure (12) is provided between the upper guide rail (4) and the lower guide rail (5) to provide linear constraint for the sliding of the rear support (3).

6. An adjustable structural vibration testing fixture according to claim 1, characterized in that, The lower guide rail (5) is provided with a T-shaped groove (13). The positioning mechanism includes a positioning screw (10) and a positioning nut (11). The head of the positioning screw (10) is slidably disposed in the T-shaped groove (13). The shank of the positioning screw (10) passes through the upper guide rail (4) and is threadedly engaged with the positioning nut (11).

7. An adjustable structural vibration testing fixture according to claim 1, characterized in that, The rear support (3) includes a lower support (7) and an upper clamp (6); the lower support (7) is fixed on the upper guide rail (4), and the upper clamp (6) is detachably connected to the lower support (7) by fasteners to hold and fix the rear end of the cylindrical shell product.

8. An adjustable structural vibration testing fixture according to claim 4, characterized in that, The V-shaped guide structure (12) includes a V-shaped guide groove disposed on the upper guide rail (4) and a V-shaped guide protrusion disposed at the bottom of the lower guide rail (5).

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