A vibration table adapter device for fatigue test and a fatigue test workbench

Abstract

This invention discloses a vibration table adapter and a fatigue testing workbench for fatigue testing. The vibration table adapter mainly includes: a push rod with a threaded hole on one end face; an adapter with a first connecting part with external threads at one end, which is fastened to the threaded hole on the push rod, and a second connecting part with a smaller width at the other end; and a fastening mechanism fixed to the second connecting part of the adapter. During testing, the fixed end of the specimen is fixed to the fixed table using a clamp; the swinging end of the specimen is fixed to the connector of the vibration table adapter; and the other end of the push rod is fixed to the actuating cylinder of the vibration table. The vibration table adapter of this invention has the advantages of simple structure and convenient operation, and enables multi-station, high-efficiency testing on the fatigue testing workbench constructed using the vibration table adapter.

Description

Technical Field

[0001] This invention belongs to the field of fatigue testing, specifically a vibration table adapter and a fatigue testing workbench for fatigue testing. Background Technology

[0002] Besides theoretical calculations and simulation analysis, the most reliable method for determining the fatigue characteristics of materials is through experimental testing. Currently, the commonly used testing equipment is the electro-hydraulic servo fatigue testing machine, but it has two drawbacks: firstly, the testing frequency is relatively low, typically below 30Hz, resulting in a long testing cycle; secondly, it can usually only perform fatigue tests on a single sample at a time, and cannot test multiple samples simultaneously.

[0003] Compared to commonly used electro-hydraulic servo fatigue testing machines, vibration tables operate at higher frequencies, thus making fatigue testing more efficient.

[0004] When using the electro-hydraulic servo fatigue testing machine, it is only necessary to fix both ends of the specimen onto the machine using conventional clamps. However, when using a vibration table for fatigue testing, one end of the specimen, the fixed end, needs to be fixed to the fixed table using clamps; while the other end of the specimen, the swinging end, needs to be connected to the actuator of the vibration table. Since the swinging end of the specimen cannot be directly connected to the actuator of the vibration table, a connecting device is needed to fix the swinging end of the specimen to the actuator of the vibration table. Summary of the Invention

[0005] To address the issue of transferring samples between existing vibration tables, the first objective of this invention is to provide a vibration table transfer device for fatigue testing.

[0006] The second objective of this invention is to provide a fatigue testing workbench.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] A vibration table adapter for fatigue testing, comprising:

[0009] The push rod has a screw hole on one end face;

[0010] The adapter has a first connecting part with external threads at one end, which is fastened to the threaded hole on the push rod, and a second connecting part with a smaller width at the other end.

[0011] A fastening mechanism is fixed to the second connecting part of the adapter.

[0012] According to a preferred embodiment, the second connecting part of the adapter is provided with external threads, and the fastening mechanism is a nut, which is detachably fixed to the second connecting part of the adapter by means of thread engagement.

[0013] According to a preferred embodiment, the second connecting part of the adapter is provided with a first pin hole, and the fastening mechanism is a pin inserted into the first pin hole.

[0014] Furthermore, a collar is fitted onto the second connecting part of the adapter, and a second pin hole is provided on the collar. The pin is simultaneously inserted into the second pin hole on the collar and the first pin hole on the second connecting part.

[0015] Furthermore, the vibration table adapter also includes a connecting plate with a through second connecting hole; the rear end of the push rod has a limiting part, the width D1 of which is greater than the width D2 of the second connecting hole; a locking nut is threaded onto the rear part of the push rod, wherein:

[0016] The second connecting hole of the connecting plate is sleeved on the outside of the push rod, and the limiting part of the push rod and the locking nut are respectively locked on both sides of the connecting plate to fix the push rod and the connecting plate together;

[0017] The connecting plate is also provided with a plurality of first fixing holes.

[0018] According to a preferred embodiment, the length D3 of the second connecting hole on the connecting plate is greater than its width D2.

[0019] Furthermore, the outer edge of the second connecting hole on the connecting plate is provided with a slot for accommodating the limiting part of the push rod.

[0020] Furthermore, the push rod is also equipped with a sensor to monitor changes in force.

[0021] A fatigue testing workbench includes a first platform, several fixtures, a mounting plate, and several vibration table adapters as described above, wherein:

[0022] The first platform is provided with a plurality of second fixing holes for detachably fixing the plurality of clamps to the first platform by means of fixing components;

[0023] The mounting plate is provided with several third fixing holes for fixing one end of the vibration table adapter.

[0024] The aforementioned clamps and vibration table adapters are used to hold several samples.

[0025] During the test, the mounting plate was fixed to the actuating cylinder of the vibration table; the first platform was fixed to the fixed platform.

[0026] Furthermore, a second platform is provided on the lower side of the first platform. The first platform has a plurality of fourth fixing holes, and the second platform has a plurality of fifth fixing holes. By means of fasteners passing through the fourth fixing holes on the first platform and the fifth fixing holes on the second platform in sequence, the first platform and the second platform are detachably fixed together.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The fixed connection structure between the push rod, adapter and fastening mechanism is simple and very convenient and quick to operate.

[0029] 2. The adapter and the sample are fixedly connected by the fastening mechanism. The fastening mechanism can be a pin or a nut, or a combination of both, to secure the sample and the adapter together, ensuring the effective connection.

[0030] 3. A collar is also fitted onto the second connecting part of the adapter, which improves the contact force effect between the fastening mechanism and the swing end sidewall of the sample. The collar is provided with multiple second pin holes, which can more conveniently and quickly align the second pin holes with the first pin holes on the second connecting part of the adapter.

[0031] 4. The end of the push rod connected to the actuator cylinder of the vibration table is detachably fixed with a connecting plate to facilitate installation and disassembly.

[0032] 5. The length D3 of the second connecting hole on the connecting plate is larger than its width D2, which makes it very convenient to adjust the position between the connecting plate and the push rod. The rear edge of the second connecting hole on the connecting plate is provided with a slot with a width not less than the width D1 of the upper limit part of the push rod. The limiting part of the push rod is accommodated in the slot, reducing the space occupied in the installation.

[0033] 6. The fatigue testing workbench provides multiple workstations with adjustable positions, allowing multiple samples to be tested simultaneously, further improving testing efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the fatigue testing workbench for an example.

[0035] Figure 2 This is an isometric schematic diagram of a vibration table adapter for fatigue testing, as shown in the embodiment.

[0036] Figure 3 for Figure 2 A schematic diagram of its breakdown.

[0037] Figure 4 for Figure 2The rear-view axonometric view shows the connection between the limiting part at the rear end of the push rod and the rear side of the second connecting hole of the connecting plate.

[0038] Drawing number explanation:

[0039] 10. Push rod, 11. Screw hole, 12. Limiting part, 13. Connecting plate, 130. Second connecting hole, 131. First fixing hole, 132. Slot, 14. Locking nut, 15. Sensor.

[0040] 20. Adapter, 21. First connecting part, 22. Second connecting part, 220. First pin hole, 23. Collar, 230. Second pin hole.

[0041] 30. Fastening mechanism; 30-1. Nut; 30-2. Pin; 40. Sample; 41. Fixed end; 42. Swinging end; 420. First connecting hole.

[0042] 50. First platform, 51. Second fixing hole, 52. Fourth fixing hole, 53. Fixture.

[0043] 60. Mounting plate, 61. Third fixing hole, 70. Second platform, 71. Fifth fixing hole.

[0044] 80. Vibration table; 81. Actuator of vibration table; 90. Fixed table. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] In this invention, the high frequency of the vibration table refers to a frequency that is higher than the operating frequency of a conventional fatigue testing machine.

[0047] Example 1

[0048] like Figure 2 and Figure 3 As shown, the vibration table adapter for fatigue testing in this embodiment includes a push rod 10, an adapter 20, and a fastening mechanism 30.

[0049] The push rod 10 has a screw hole 11 on one end face for fixed connection with the adapter 20.

[0050] One end of the adapter 20 is provided with a first connecting part 21, which has an external thread. The first connecting part 21 can be easily inserted into the screw hole 11 on the push rod 10 and tightened so that the first connecting part 21 of the adapter 20 is fixed together with the end of the push rod 10 by means of thread engagement; the other end is provided with a second connecting part 22, which has a width smaller than the width of the adapter 20 body.

[0051] The swing end 42 of the sample 40 is provided with a first connecting hole 420 for engaging with the second connecting part 22 of the adapter 20. The swing end 42 of the sample 40 is clamped between the body of the adapter 20 and the fastening mechanism 30 to fix the swing end 42 of the sample 40 to the adapter 20 together.

[0052] Combination Figure 1 As shown, during the test, the fixed end 41 of the sample 40 is fixed to the fixed platform 90 by means of the clamp 53; the swing end 42 of the sample 40 is fixed together with the connector 20 of the vibration table adapter, and the push rod of the vibration table adapter is fixed together with the actuating cylinder 81 of the vibration table 80. The fixed platform 90 is stationary, and the actuating cylinder 81 of the vibration table 80 outputs high-frequency vibration to the swing end 42 of the sample, thereby driving the sample 40 to undergo bending deformation. The vibration table 80 and the clamp 53 used to fix the fixed end 41 of the sample 40 are both prior art, and their specific structures will not be described in detail in this invention.

[0053] Preferably, the fastening mechanism 30 can be in the following manner:

[0054] (I) The fastening mechanism 30 is a nut 30-1, and the second connecting part 22 of the adapter 20 is provided with external threads. During connection, firstly, the second connecting part 22 of the adapter 20 is passed through the first connecting hole 420 of the swing end 42 of the sample 40, so that the swing end 42 of the sample 40 is fitted onto the outside of the second connecting part 22 of the adapter 20; then, the nut 30-1 is tightened on the second connecting part 22 of the adapter 20, thereby fixing the swing end 42 of the sample 40 to the second connecting part 22 of the adapter 20. Alternatively,

[0055] (ii) The fastening mechanism 30 is a pin 30-2, and the second connecting portion 22 of the adapter 20 is provided with a first pin hole 220. The first pin hole 220 is at a suitable distance from the body of the adapter 20, so that when the swing end 42 of the sample 40 is fitted onto the outside of the second connecting portion 22 of the adapter 20, the swing end 42 of the sample 40 is simultaneously located between the body of the adapter 20 and the first pin hole 220. Subsequently, the pin 30-2 is inserted into the first pin hole 220, thereby fixing the swing end 42 of the sample 40 to the second connecting portion 22 of the adapter 20.

[0056] Alternatively, both methods I) and II) can be used simultaneously. First, the pin 30-2 is used to limit and fix the device, and then the nut 30-1 is tightened on the outside of the pin 30-2 to secure it.

[0057] Furthermore, a collar 23 is also fitted onto the second connecting portion 22 of the adapter 20 to improve the contact force effect between the fastening mechanism 30 and the side wall of the swing end 42 of the sample 40. The collar 23 has a second pin hole 230. When the fastening mechanism 30 is a pin 30-2, the pin 30-2 sequentially passes through the second pin hole 230 on the collar 23 and the first pin hole 220 on the second connecting portion 22 for limiting and fastening. Preferably, the collar 23 has multiple second pin holes 230, which are arranged around the collar 23 to more conveniently and quickly align the second pin holes 230 with the first pin holes 220 on the second connecting portion 22 of the adapter 20.

[0058] To improve the fastening effect of fixing the swing end 42 of the sample 40 to the second connecting part 22 of the adapter 20, several pressure rings (not shown in the figure) are provided on both sides of the swing end 42 of the sample 40. These pressure rings are also sleeved on the outside of the second connecting part 22 of the adapter 20. Setting pressure rings between the fixed contact surfaces is a conventional technical means, which will not be described in detail here.

[0059] To improve the convenience and reliability of the connection, a connecting plate 13 is detachably fixed to one end of the push rod 10 that is connected to the actuating cylinder 81 of the vibration table 80.

[0060] Combination Figure 4 As shown, the connecting plate 13 has a through second connecting hole 130, and the rear end of the push rod 10 has a wider limiting part 12, the width D1 of which is greater than the width D2 of the second connecting hole 130. When the push rod 10 is connected to the connecting plate 13, the front end of the push rod 10 passes through the second connecting hole 130 of the connecting plate 13, and the connecting plate 13 is sleeved on the outside of the push rod 10. The limiting part 12 at the rear end of the push rod 10 is then locked on the rear side of the second connecting hole 130 of the connecting plate 13. The push rod 10 has an external thread (not shown in the figure) near the rear end, and a locking nut 14 is sleeved on it. The locking nut 14 is locked on the front side of the second connecting hole 130 of the connecting plate 13. In this way, the limiting part 12 of the push rod 10 and the locking nut 14 are respectively engaged on both sides of the connecting plate 13, and are fastened by the threaded engagement between the push rod 10 and the locking nut 14, thereby fixing the rear end of the push rod 10 to the connecting plate 13. The connecting plate 13 is also provided with a plurality of first fixing holes 131 for fixing the connecting plate 13 to the actuating cylinder 81 of the vibration table 80.

[0061] Preferably, the length D3 of the second connecting hole 130 on the connecting plate 13 is larger than its width D2, and the second connecting hole 130 is approximately strip-shaped. This allows the end of the push rod 10 to move along the length of the second connecting hole 130, thereby adjusting the relative position between the two. This makes the connection more convenient and flexible. For example, if the positions of the clamp 53 and the connecting plate 13 used to fix the fixed end 41 of the sample 40 are already fixed, and if a sample 40 of a different length needs to be replaced, only the position between the connecting plate 13 and the push rod 10 needs to be adjusted, without having to disassemble and reset the positions of the clamp 53 and the connecting plate 13.

[0062] Furthermore, a slot 132 with a width not less than the width D1 of the upper limit portion 11 of the push rod 10 is provided at the rear edge of the second connecting hole 130 on the connecting plate 13, so as to accommodate the limiting portion 11 of the push rod 10 in the slot 132, so as to make the connection structure more compact and reduce the occupation of installation space.

[0063] Furthermore, the push rod 10 is also equipped with a sensor 15 for monitoring changes in force. The sensor 15 is preferably a force sensor or an acceleration sensor. During the test, the frequency and amplitude of the vibration output by the vibration table are collected to determine the corresponding SN (stress-life) curve.

[0064] Example 2

[0065] like Figure 1 As shown, the fatigue test workbench of this embodiment includes a first platform 50, several fixtures 53, a mounting plate 60, and several vibration table adapters of Embodiment 1.

[0066] The first platform 50 is provided with a plurality of second fixing holes 51 for fixing the clamps 53. The second fixing holes 51 may be evenly arranged or arranged according to other rules as needed, and are not limited in this invention. One or more clamps 53 can be detachably fixed on the first platform 50, and the position of the clamps 53 on the first platform 50 can also be adjusted.

[0067] The mounting plate 60 is provided with a plurality of third fixing holes 61 for fixing one end of the vibration table adapter. The number of third fixing holes 61 can be set as needed, and usually a large number can be set so that multiple vibration table adapters can be fixed at the same time.

[0068] During the test, the mounting plate 60 is fixed to the actuating cylinder 81 of the vibration table 80; the first platform 50 is fixed to the fixed platform 90. The number of the plurality of clamps 53 and the plurality of vibration table adapters are consistent, with one sample 40 clamped between one clamp 53 and one vibration table adapter. In this way, the fatigue testing workbench of this embodiment can simultaneously test multiple samples 40.

[0069] Furthermore, a second platform 70 is provided on the lower side of the first platform 50. The first platform 50 has a plurality of fourth fixing holes 52, and the second platform 70 has a plurality of fifth fixing holes 71. The first platform 50 and the second platform 70 are detachably fixed together by means of fasteners such as bolts passing sequentially through the fourth fixing holes 52 on the first platform 50 and the fifth fixing holes 71 on the second platform 70. In addition, the position between the first platform 50 and the second platform 70 is adjustable. The second platform 70 is fixed to the fixing table 90, thereby securing the first platform 50 and the fixing table 90 together.

[0070] The fatigue testing workbench in this embodiment provides multiple workstations, allowing multiple samples 40 to be tested simultaneously, further improving testing efficiency. Meanwhile, in this embodiment, the vibration table adapter is fixed to the actuating cylinder 81 of the vibration table 80 via the mounting plate 60, and the clamp 53 is fixed to the fixed platform 90 via the first platform 50 and the second platform 70, making its position adjustable and flexible to use.

[0071] The above embodiments detail the vibration table adapter and fatigue testing workbench for fatigue testing according to the present invention, but should not be construed as limiting the present invention. It is readily understood that those skilled in the art can make modifications, substitutions, and further improvements based on the technical solutions of the present invention, but any modifications or equivalent substitutions will fall within the scope of protection claimed in the claims of the present invention.

Claims

1. A vibration table adapter for fatigue testing, characterized in that... include: The push rod has a screw hole on one end face; The adapter has a first connecting part with external threads at one end, which is fastened to the threaded hole on the push rod, and a second connecting part with a smaller width at the other end. The fastening mechanism is fixed to the second connecting part of the adapter; The fastening mechanism includes a nut and a pin. The second connecting part of the adapter is provided with an external thread for tightening the nut, and the second connecting part is provided with a first pin hole. The second connecting part of the adapter is also fitted with a collar, and the collar is provided with a second pin hole. The first pin hole and the second pin hole are used for the pin to pass through. The vibration table adapter also includes a connecting plate with a through second connecting hole; the rear end of the push rod has a limiting part, the width D1 of which is greater than the width D2 of the second connecting hole; a locking nut is threaded onto the rear end of the push rod, wherein: The second connecting hole of the connecting plate is sleeved on the outside of the push rod, and the limiting part of the push rod and the locking nut are respectively locked on both sides of the connecting plate to fix the push rod and the connecting plate together; The outer edge of the second connecting hole on the connecting plate is provided with a slot for accommodating the limiting part of the push rod; The length D3 of the second connecting hole on the connecting plate is greater than its width D2.

2. The vibration table adapter according to claim 1, characterized in that, The second connecting part of the adapter is provided with external threads, and the fastening mechanism is a nut, which is detachably fixed to the second connecting part of the adapter by means of thread engagement.

3. The vibration table adapter according to claim 1, characterized in that, The second connecting part of the adapter is provided with a first pin hole, and the fastening mechanism is a pin, which is inserted into the first pin hole.

4. The vibration table adapter according to claim 3, characterized in that, A collar is fitted onto the second connecting part of the adapter, and a second pin hole is provided on the collar. The pin is simultaneously inserted into the second pin hole on the collar and the first pin hole on the second connecting part.

5. The vibration table adapter according to claim 1, characterized in that, The connecting plate is also provided with a plurality of first fixing holes.

6. The vibration table adapter according to claim 1, characterized in that, The push rod is also equipped with a sensor to monitor changes in force.

7. A fatigue testing workbench, characterized in that... It includes a first platform, a plurality of clamps, a mounting plate, and a plurality of vibration table adapters as described in any one of claims 1 to 6, wherein: The first platform is provided with a plurality of second fixing holes for detachably fixing the plurality of clamps to the first platform by means of fixing components; The mounting plate is provided with several third fixing holes for fixing one end of the vibration table adapter. The aforementioned clamps and vibration table adapters are used to hold several samples.

8. The fatigue testing workbench according to claim 7, characterized in that, A second platform is provided on the lower side of the first platform. The first platform has several fourth fixing holes, and the second platform has several fifth fixing holes. By means of fasteners passing through the fourth fixing holes on the first platform and the fifth fixing holes on the second platform in sequence, the first platform and the second platform are detachably fixed together.

Images