Dynamic stiffness test mechanism
By designing a dynamic stiffness testing mechanism, and utilizing the sliding connection between the support and the expansion block and the expansion force applied by the clamping component, the problem of deviation in the dynamic stiffness test results of the hole was solved, and the consistency of the test results and the efficiency were improved.
Patent Information
- Application Number
- CN202423285902.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing technologies, there are discrepancies between the simulation test results and the actual test results for the dynamic stiffness of the hole, which affects the accuracy and consistency of the test results.
A dynamic stiffness testing mechanism was designed, including a support, an expansion block, a clamping component, and a support. The consistency of the excitation position is ensured by the sliding connection between the support and the expansion block and the expansion force applied by the clamping component, and it can adapt to through holes of different diameters.
It improves the consistency between simulation test results and actual test results, expands the test range, adapts to through holes of different diameters, and improves test efficiency.
Smart Images
Figure CN223611091U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the mechanical technical field, in particular to a dynamic stiffness testing mechanism. BACKGROUND
[0002] In the manufacturing process of modern automobiles, hole position precision and connection strength have important influence on automobile performance. Especially in the key parts bearing dynamic load, hole dynamic stiffness testing becomes an important technical link. Hole dynamic stiffness testing mainly evaluates the deformation ability of automobile part hole position under external force, to ensure that the part can withstand various dynamic loads (such as driving vibration, collision, etc.) without failure in actual use. The test of hole dynamic stiffness not only relates to the strength and safety of the part, but also affects the overall comfort and handling of the vehicle. For example, in the suspension system, body connecting parts and other components, the stiffness and connection mode of the hole directly affect the driving stability and safety of the vehicle.
[0003] With the refinement of manufacturing process, the test of hole dynamic stiffness has gradually developed from traditional static test to dynamic test, using advanced sensors, vibration analysis and finite element analysis technology, which can accurately simulate and measure the dynamic stress and deformation of the hole in actual use. During the research and development process, the applicant found that the simulation test and actual test of hole dynamic stiffness have large deviation in test position, which affects the accuracy and consistency of test results. CONTENT OF THE INVENTION
[0004] The technical problem solved by the present application is to provide a dynamic stiffness testing mechanism that can improve the consistency and efficiency of testing the dynamic stiffness of the hole to be tested.
[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a dynamic stiffness testing mechanism, comprising: a support for inserting into a hole to be tested; a plurality of expansion blocks arranged in the circumferential direction of the hole to be tested, wherein the expansion blocks are in sliding connection with the support in the radial direction of the hole to be tested, so that the outer circumferential surface of the expansion blocks abuts against the hole wall of the hole to be tested; and a compression assembly for applying expansion force to the expansion blocks towards the hole to be tested after the outer circumferential surface of the expansion blocks abuts against the hole wall of the hole to be tested.
[0006] The support comprises a first connecting ring, a second connecting ring coaxially arranged with the first connecting ring, and a connecting column connecting the first connecting ring and the second connecting ring; a plurality of expansion blocks are arranged between the first connecting ring and the second connecting ring, and the expansion blocks are in sliding connection with the first connecting ring and the second connecting ring in the radial direction.
[0007] The first sliding structure comprises sliding balls, and the second sliding structure comprises grooves for receiving the sliding balls.
[0008] The number of the connecting columns is multiple, and the multiple connecting columns are arranged at intervals along the circumference of the first connecting ring.
[0009] The dynamic stiffness testing mechanism further comprises a support connected to the outer circumferential surface of the expansion block and used for abutting against the hole wall of the hole to be tested.
[0010] The outer circumferential surface of the expansion block is provided with a threaded hole, and the support is connected with a threaded column which is used for being inserted into the threaded hole.
[0011] The compression assembly comprises a fixed shaft inserted into a central space formed by the multiple expansion blocks, a compression block in a conical structure which is slidably sleeved on the fixed shaft and comprises a first end portion and a second end portion arranged in the axial direction of the fixed shaft, the diameter of the first end portion is smaller than that of the second end portion, and the first end portion is arranged towards the multiple expansion blocks, and a locking member used for locking the compression block and the expansion block.
[0012] The fixed shaft is a screw rod, and the locking member is a nut which is sleeved on the screw rod and located on the side of the compression block away from the expansion block.
[0013] The number of the compression blocks is two, and the two compression blocks are arranged on two sides of the expansion block.
[0014] The second end portion of one of the compression blocks is connected with a connecting block which is used for connecting a sensor.
[0015] Compared with the prior art, on the one hand, the dynamic stiffness testing mechanism is placed in the hole to be tested during testing, so that the hole to be tested is excited, and the consistency of the simulation test result and the actual test result is improved, and on the other hand, the expansion block and the support are slidably connected in the dynamic stiffness testing mechanism, the width of the dynamic stiffness testing mechanism is adjusted, the through hole with different diameters is adapted, and the test range of the hole to be tested is expanded. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings. Among them:
[0017] Figure 1 is a structural schematic diagram of an embodiment of a dynamic stiffness test mechanism of the present application;
[0018] Figure 2 is an exploded view of the dynamic stiffness test mechanism in Figure 1
[0019] Figure 3 is a structural schematic diagram of a support in Figure 1
[0020] Figure 4 is a structural schematic diagram of an expansion block in Figure 1
[0021] Figure 5 is a structural schematic diagram of a compression assembly in Figure 1 DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0023] In the dynamic stiffness test of a large through-hole mounting hole, in the simulation test stage, the excitation is usually applied in the middle of the hole, but in the actual test stage, the excitation is applied at the edge of the hole, which is different from the position of the excitation applied in the simulation test, resulting in a deviation between the simulation test result and the actual test result. In order to improve the consistency of the simulation test result and the actual test result, the following technical solutions are proposed in the present application.
[0024] In combination with Figure 1 and Figure 2 , the dynamic stiffness test mechanism 1 comprises a support 10, a plurality of expansion blocks 20 and a compression assembly 30.
[0025] The support 10 is used to be inserted into the hole to be tested, and the plurality of expansion blocks 20 are used to be arranged in the hole to be tested and arranged in the circumferential direction of the hole to be tested, wherein the expansion blocks 20 are in sliding connection with the support 10 in the radial direction of the hole to be tested, so that the outer circumferential surface 21 of the expansion blocks 20 abuts against the hole wall of the hole to be tested.
[0026] Specifically, the expansion blocks 20 are in sliding connection with the support 10, and the expansion blocks 20 can slide back and forth in the radial direction of the hole to be tested, so that the outer circumferential surface of the expansion blocks 20 can abut against the hole wall of the hole to be tested with different hole diameters.
[0027] The compression assembly 30 is used to apply an expansion force of the expansion blocks 20 towards the hole to be tested after the outer circumferential surface 21 of the expansion blocks 20 abuts against the hole wall of the hole to be tested. Specifically, after the outer circumferential surface 21 of the expansion blocks 20 abuts against the hole wall of the hole to be tested, the compression assembly 30 is contracted to compress the expansion blocks 20, and the expansion blocks 20 apply an expansion force towards the hole to be tested to fix the position of the dynamic stiffness testing mechanism 1 in the hole to be tested.
[0028] When the dynamic stiffness test of the hole to be tested is performed, the dynamic stiffness testing mechanism 1 needs to be placed in the hole to be tested first. The hole to be tested can be a circular hole, a square hole or a triangular hole, and the shape of the hole to be tested is not limited in the application. After adjusting the outer circumferential surface 21 of the expansion blocks 20 to abut against the hole wall of the hole to be tested, the compression assembly 30 is used to apply an expansion force of the expansion blocks 20 towards the hole to be tested, so that the outer circumferential surface 21 of the expansion blocks 20 always abuts against the hole wall of the hole to be tested. Then, an excitation can be applied to one end of the compression assembly 30. Since the dynamic stiffness testing mechanism 1 is located in the hole, the position of the excitation can be located in the hole to be tested. For example, the excitation can be applied at the center position of the hole to be tested, so that the position of the excitation during actual testing can be consistent with the position of the excitation during simulation testing, thereby improving the consistency of the test results.
[0029] Referring to Figure 3 The support 10 includes a first connecting ring 110, a second connecting ring 120 and a connecting column 130.
[0030] The second connecting ring 120 is coaxially arranged with the first connecting ring 110, and the connecting column 130 connects the first connecting ring 110 and the second connecting ring 120. The plurality of expansion blocks 20 are arranged between the first connecting ring 110 and the second connecting ring 120, and the expansion blocks 20 are in sliding connection with the first connecting ring 110 and the second connecting ring 120 in the radial direction.
[0031] Specifically, the expansion blocks 20 are arranged between the first connecting ring 110 and the second connecting ring 120, and the first connecting ring 110 and the second connecting ring 120 can limit the movement of the expansion blocks 20 in the axial direction. The expansion blocks 20 are in sliding connection with the first connecting ring 110 and the second connecting ring 120, which facilitates the adjustment of the width of the expansion blocks 20.
[0032] In an embodiment, as Figure 3As shown, the diameters of the first connecting ring 110 and the second connecting ring 120 can be the same, and in other embodiments, the diameters of the first connecting ring 110 and the second connecting ring 120 can be different, and it should be noted that the present application does not limit the diameters of the first connecting ring 110 and the second connecting ring 120.
[0033] In combination Figure 3 And Figure 4 In an embodiment, the first connecting ring 110 is provided with the first sliding structure 140 on the first annular surface 111 facing the second connecting ring 120, and the second connecting ring 120 is provided with the second sliding structure 210 on the second annular surface 121 facing the first connecting ring 110, and the surface of the expansion block 20 facing the first connecting ring 110 and the second connecting ring 120 is provided with the second sliding structure 210 matching the first sliding structure 140, wherein the first sliding structure 140 includes sliding balls 141, and the second sliding structure 210 includes grooves 211 receiving the sliding balls 141.
[0034] Specifically, the first sliding structure 140 on the first connecting ring 110 and the second connecting ring 120 matches the second sliding structure 210 on the expansion block 20, for example, the first connecting ring 110 and the second connecting ring 120 are provided with sliding balls 141, the expansion block 20 is provided with grooves 211, the sliding balls 141 are arranged in the grooves 211 and slide in the grooves 211, so that the expansion block 20 is slidingly connected with the first connecting ring 110 and the second connecting ring 120. In another embodiment, only the first connecting ring 110 is provided with sliding balls 141 on the first annular surface 111 facing the second connecting ring 120, and the expansion block 20 is provided with grooves 211 facing the first connecting ring 110. In yet another embodiment, only the second connecting ring 120 is provided with sliding balls 141 on the second annular surface 121 facing the first connecting ring 110, and the expansion block 20 is provided with grooves 211 facing the second connecting ring 120. In other embodiments, the expansion block 20 is provided with sliding balls 141, and the first connecting ring 110 and the second connecting ring 120 are provided with grooves 211.
[0035] Continuing to refer to Figure 3 The number of connecting columns 130 is multiple, and the multiple connecting columns 130 are arranged at intervals along the circumference of the first connecting ring 110, wherein one expansion block 20 is arranged between any two adjacent connecting columns 130.
[0036] Specifically, the connecting columns 130 are arranged at intervals along the circumference of the first connecting ring 110, and the expansion block 20 is arranged between the two connecting columns 130, and the expansion block 20 slides radially between the two connecting columns 130. Further, the connecting columns 130 are arranged at equal intervals along the circumference of the first connecting ring 110, so that when the excitation is applied, the side wall of the hole to be measured is uniformly stressed.
[0037] Continuing to refer toFigure 2 The dynamic stiffness testing mechanism 1 further comprises a support 40 connected with the outer circumferential surface 21 of the expansion block 20, and used for abutting against the hole wall of the hole to be tested. Specifically, the support 40 is connected with the outer circumferential surface 21 of the expansion block 20, and further extends the width of the expansion block 20, thereby expanding the measurement range of the hole to be tested.
[0038] In an embodiment, the outer circumferential surface 21 of the expansion block 20 is provided with a threaded hole 220, and the support 40 is provided with a threaded column 410 which is used for being inserted into the threaded hole 220. Specifically, the threaded column 410 on the support 40 is threadedly matched with the threaded hole 220 on the expansion block 20, and the distance between the threaded column 410 and the threaded hole 220 is adjusted, so as to adjust the distance between the support 40 and the expansion block 20, extend the distance of the outer circumferential surface of the expansion block 20, and further adjust the width range of the dynamic stiffness testing mechanism 1.
[0039] Referring to Figure 5 The compression assembly 30 comprises a fixed shaft 310, a compression block 320 and a locking member 330.
[0040] The fixed shaft 310 is used for being inserted into the central space formed by the plurality of expansion blocks 20, the compression block 320 is slidably sleeved on the fixed shaft 310, the compression block 320 has a tapered structure, the compression block 320 comprises a first end portion 321 and a second end portion 322 which are arranged in the axial direction of the fixed shaft 310, the diameter of the first end portion 321 is smaller than that of the second end portion 322, and the first end portion 321 is arranged towards the plurality of expansion blocks 20, and the locking member 330 is used for locking the compression block 320 and the expansion block 20.
[0041] Specifically, the fixed shaft 310 is located in the central space formed by the plurality of expansion blocks 20, the compression block 320 is arranged at both ends of the fixed shaft 310, and during the locking process of the compression block 320 by the locking member 330, the first end portion 321 of the compression block 320 moves towards the expansion block 20, the first end portion 321 compresses the expansion block 20 to fix the position of the expansion block 20, and meanwhile the locking member 330 is locked.
[0042] In another embodiment, the compression block 320 is provided with an internal thread, and the fixed shaft 310 is provided with an external thread, that is, the compression block 320 and the fixed shaft 310 can be fixedly connected without the locking member 330.
[0043] Continuing to refer to Figure 5 The fixed shaft 310 is a screw rod, and the locking member 330 is a nut which is sleeved on the screw rod and located on the side of the compression block 320 away from the expansion block 20. Specifically, the locking member 330 is sleeved on the fixed shaft 310, and the locking member 330 is threadedly matched with the fixed shaft 310, the locking member 330 is tightened to press the compression block 320, so as to lock the compression block 320 to fix the expansion block 20.
[0044] With reference to the above Figure 2 , the number of the pressing blocks 320 is two, and the two pressing blocks 320 are arranged on the two sides of the expansion block 20. Specifically, the pressing blocks 320 are arranged on the two sides of the expansion block 20, and the distance between the two pressing blocks 320 is reduced to press the expansion block 20, so as to fix the position of the expansion block 20, and further fix the position of the dynamic stiffness testing mechanism 1 in the hole to be measured.
[0045] With reference to the above Figure 2 , the second end 322 of one of the pressing blocks 320 is connected with a connecting block 50, and the connecting block 50 is used to connect the sensor. Specifically, the side surface of the connecting block 50 is attached with the sensor, and the excitation is applied on the top of the connecting block 50, that is, the excitation is applied on the side of the connecting block 50 away from the pressing block 320, and the sensor measures the acceleration, and the dynamic stiffness of the hole to be measured is calculated according to the actual measured acceleration.
[0046] The above is only the embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A dynamic stiffness testing mechanism, characterized by, The utility model relates to a kind of dynamic stiffness testing mechanism, including: Support for inserting into the hole to be measured; Multiple expansion blocks for being arranged in the hole to be measured and arranged in the circumferential direction of the hole to be measured, wherein the expansion blocks are slidably connected with the support in the radial direction of the hole to be measured, so that the outer circumferential surface of the expansion blocks abuts the hole wall of the hole to be measured; Compression assembly for applying expansion force to the expansion blocks after the outer circumferential surface of multiple expansion blocks abuts the hole wall of the hole to be measured.
2. The dynamic stiffness test mechanism of claim 1, wherein, The support includes a first connecting ring, a second connecting ring coaxially arranged with the first connecting ring, and a connecting column connecting the first connecting ring and the second connecting ring;Multiple expansion blocks are arranged between the first connecting ring and the second connecting ring, and the expansion blocks are slidably connected with the first connecting ring and the second connecting ring in the radial direction.
3. The dynamic stiffness test mechanism of claim 2, wherein, The first annular surface of the first connecting ring towards the second connecting ring and / or the second annular surface of the second connecting ring towards the first connecting ring is provided with a first sliding structure;The surface of the expansion block towards the first connecting ring and / or the second connecting ring is provided with a second sliding structure matched with the first sliding structure;Wherein, the first sliding structure includes sliding ball, and the second sliding structure includes groove receiving the sliding ball.
4. The dynamic stiffness test mechanism of claim 2, wherein, The number of connecting columns is multiple, and multiple connecting columns are arranged along the circumferential direction of the first connecting ring, wherein one expansion block is arranged between any two adjacent connecting columns.
5. The dynamic stiffness testing mechanism of claim 1, wherein, The dynamic stiffness testing mechanism further includes a support connected with the outer circumferential surface of the expansion block for abutting the hole wall of the hole to be measured.
6. The dynamic stiffness test mechanism of claim 5, wherein, The outer circumferential surface of the expansion block is provided with a threaded hole, and the support is connected with a threaded column for inserting into the threaded hole.
7. The dynamic stiffness testing mechanism of claim 1, wherein, The compression assembly includes: A fixed shaft for inserting into the central space formed by multiple expansion blocks; A compression block slidably sleeved on the fixed shaft, the compression block is of a conical structure, including a first end portion and a second end portion arranged in the axial direction of the fixed shaft, the diameter of the first end portion is smaller than the diameter of the second end portion, and the first end portion is arranged towards multiple expansion blocks; A locking member for locking the compression block and the expansion block.
8. The dynamic stiffness test mechanism of claim 7, wherein, The fixed shaft is a screw rod, and the locking member is a nut, which is sleeved on the screw rod and located on the side of the compression block away from the expansion block.
9. The dynamic stiffness testing mechanism of claim 7, wherein, The number of compression blocks is two, and two compression blocks are arranged on the two sides of the expansion block arranged oppositely.
10. The dynamic stiffness test mechanism of claim 9, wherein, The second end portion of one of the compression blocks is connected with a connecting block, and the connecting block is used for connecting a sensor.