A high cycle fatigue limit testing device

Abstract

The application relates to the technical field of testing devices, in particular to a high-cycle fatigue limit testing device, which comprises a testing table, a mounting plate arranged on the testing table, a driving extrusion plate one slidably arranged on the mounting plate and used for extruding testing springs, a driving element arranged on the testing table and connected with the driving extrusion plate one, which is used for driving the driving extrusion plate one to reciprocally move so as to perform n-cycle fatigue tests on a group of testing springs with a compression amount of 2x% each time, and a driving extrusion plate two slidably connected with the mounting plate. The driving extrusion plate one of the device is moved by the force alternately released by the springs on both sides, the load of the driving element is effectively reduced, and the service life of the driving element and the whole device is prolonged. Meanwhile, the driving extrusion plate one and the driving extrusion plate two can respectively perform fatigue tests on different spring groups with different cycle times and compression amounts, and the testing functionality and practicability are improved.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically to a high-cycle fatigue limit testing device. Background Technology

[0002] High-cycle fatigue limit testing equipment is a core device for evaluating the fatigue resistance of materials under high-frequency cyclic loading. By applying axial, torsional, or multi-directional composite stresses, it simulates the long-term service behavior of metals, ceramics, and composite materials under complex working conditions. Among them, spring fatigue testing equipment, as a sub-field of high-cycle fatigue testing, focuses on the durability evaluation of coil springs, etc. Fatigue testing aims to simulate the stress conditions of springs in actual working processes and detect their performance changes and reliability after long-term repeated stress. Currently, one of the common spring fatigue testing methods is to use a reciprocating pressure plate to repeatedly compress the spring.

[0003] However, current spring fatigue testing devices generally have functional limitations. Most devices only support single-condition testing with a fixed compression amount for a single group of springs. When it is necessary to obtain the fatigue characteristics of springs under different compression conditions, multiple tests must be completed by starting and stopping the equipment multiple times and resetting the parameters. This serial operation mode not only significantly extends the testing cycle, but also makes it difficult for the overall testing efficiency to meet the needs of industrial batch testing. To address this, we propose a high-cycle fatigue limit testing device. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a high-cycle fatigue limit testing device, including a test bench and a mounting plate disposed on the test bench. It also includes an active compression plate slidably disposed on the mounting plate for compressing test springs. A driving component connected to the active compression plate slidably on the test bench drives the active compression plate slidably to reciprocate, performing n cycles of fatigue testing on a group of test springs with a compression amount of 2x% each time. An active compression plate slidably connected to the mounting plate is also used for compressing test springs. A linkage component is disposed on the mounting plate, and the active compression plate slidably is connected to the active compression plate slidably through the linkage component. This linkage component drives the active compression plate slidably to reciprocate when the active compression plate slidably moves, performing 2n cycles of fatigue testing on a group of test springs with a compression amount of x% each time.

[0005] In some embodiments, two slide rods are symmetrically fixedly connected to the mounting plate. The slide rods slide through one end of the active compression plate, and passive compression plates are provided on both sides of the active compression plate. The gap between the passive compression plate and the active compression plate is used to install test springs. When the active compression plate moves, the test springs on both sides of the active compression plate are alternately compressed, and the test springs on both sides are alternately released at the same time.

[0006] In some embodiments, the driving component includes a pull rod fixedly connected to an active extrusion plate, and a sliding sleeve is fixedly connected inside the test bench. One end of the pull rod slides through the sliding sleeve, and a rectangular frame is fixedly connected to one end of the pull rod. A dual-axis motor is fixedly connected inside the test bench, and a circular plate is fixedly connected to the output shaft of the dual-axis motor. A guide wheel is provided on the circular plate, and one end of the guide wheel is located inside the rectangular frame. The dual-axis motor is started to drive the active extrusion plate to move.

[0007] In some embodiments, a guide rod is fixedly connected to the mounting plate, a passive compression plate is provided at one end of the guide rod, the active compression plate is slidably connected to the guide rod, and the gap between the passive compression plate and the active compression plate is used to install a test spring.

[0008] In some embodiments, the linkage includes an L-shaped support plate fixedly connected to both ends of the active extrusion plate two. Rollers are rotatably connected to the L-shaped support plate via a rotating shaft, and a right-angled triangular block is fixedly connected to the active extrusion plate one. The edge of the right-angled triangular block contacts and abuts against the roller, and is used to push the roller to move when the active extrusion plate one is moved, so as to drive the active extrusion plate two to move.

[0009] In some embodiments, both passive compression plates are slidably connected to the slide rod. A shaft is rotatably connected to the mounting plate. Two screws with opposite thread directions are fixedly connected to the shaft, and the two screws pass through the two passive compression plates and are threadedly connected to them. A drive motor is fixedly connected to the mounting plate. The output shaft of the drive motor is fixed to the shaft. When the drive motor is started, it drives the two passive compression plates to move toward the active compression plate to compress the test spring.

[0010] In some embodiments, a second shaft is rotatably connected to the mounting plate. One end of the second shaft slides through the second active compression plate and is also fixedly connected to a screw. One end of the screw passes through the second passive compression plate and is threadedly connected to it. A helical gear plate is fixedly connected to one end of the second shaft, and a helical gear plate is also fixedly connected to the first shaft. The two helical gear plates mesh to drive the second passive compression plate to compress another set of test springs while the first passive compression plate compresses one set of test springs, and the degree of compression is equal.

[0011] In some embodiments, two L-shaped guide plates are symmetrically fixedly connected to the circular plate, and an H-shaped plate is slidably connected to the circular plate. The H-shaped plate is rotatably connected to the guide wheel through a rotating shaft. One end of the guide plate is located inside the H-shaped plate and is slidably connected to its inner wall to guide and limit the sliding of the H-shaped plate.

[0012] A shaft three is rotatably connected to the circular plate, and a screw is also fixedly connected to the shaft three. One end of the screw passes through the H-shaped plate and is connected to it by a thread. A drive motor two is fixedly connected to the circular plate, and the output shaft of the drive motor two is fixed to the shaft three.

[0013] This invention has at least the following beneficial effects:

[0014] The active compression plate of this device uses the alternating release force of springs on both sides to assist in movement, effectively reducing the load on the driving components and extending the service life of the driving components and the entire device. At the same time, the active compression plate one and the active compression plate two can perform fatigue tests on different spring groups with different cycles and compression amounts, improving the testing functionality and practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of another orientation of the structure in Embodiment 1 of the present invention;

[0017] Figure 3 For the present invention Figure 2 Schematic diagram of partial cross-section;

[0018] Figure 4 For the present invention Figure 3 Schematic diagram of partial cross-section;

[0019] Figure 5 For the present invention Figure 4 Schematic diagram of partial cross-section.

[0020] In the diagram: 1-Test stand; 11-Mounting plate; 2-Active extrusion plate one; 3-Drive component; 4-Active extrusion plate two; 5-Linkage component; 12-Slide rod; 13-Passive extrusion plate one; 14-Pull rod; 15-Sliding sleeve; 16-Rectangular frame; 17-Dual-axis motor; 18-Circular plate; 19-Guide wheel; 21-Guide rod; 22-Passive extrusion plate two; 23-L-shaped support plate; 24-Roller; 25-Right-angled triangular block; 26-Shaft one; 27-Screw; 28-Drive motor one; 29-Shaft two; 31-Helical gear disc; 32-Guide plate; 33-H-shaped plate; 34-Shaft three; 35-Drive motor two. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-5 The present invention provides a technical solution: a high-cycle fatigue limit testing device, comprising a test bench 1 and a mounting plate 11 disposed on the test bench 1, and further comprising:

[0023] An active compression plate 2 is slidably mounted on a mounting plate 11 for compressing test springs. Two sliding rods 12 are symmetrically fixedly connected to the mounting plate 11. The sliding rods 12 slide through the ends of the active compression plate 2. Passive compression plates 13 are provided on both sides of the active compression plate 2. The gap between the passive compression plates 13 and the active compression plate 2 is used to install test springs. When the active compression plate 2 moves, it alternately compresses and releases the test springs on both sides. The alternating release force of the springs on both sides directly assists in pushing the active compression plate 2 to move, thereby reducing the load on the drive component 3 and extending the service life of the device.

[0024] The driving component 3 is set on the test bench 1 and connected to the active compression plate 2. It is used to drive the active compression plate 2 to reciprocate so as to perform a fatigue test on a set of springs on it with n cycles and a compression amount of 2x% each time.

[0025] Active compression plate 24 is slidably mounted on mounting plate 11 and is also used to compress test spring. A guide rod 21 is fixedly connected to mounting plate 11. A passive compression plate 22 is slidably connected to one end of guide rod 21. Active compression plate 24 is slidably connected to guide rod 21. The gap between passive compression plate 22 and active compression plate 24 is used to install test spring.

[0026] Linkage 5 is set on mounting plate 11, and active compression plate 2 is connected to active compression plate 2 through linkage 5. It is used to drive active compression plate 2 to reciprocate when active compression plate 2 moves, so as to perform fatigue test on a set of test springs on it for 2n cycles and each compression amount of x%.

[0027] Specifically, the active compression plate 2 of this device uses the alternating release force of the springs on both sides to assist in movement, effectively reducing the load on the drive component 3 and extending the service life of the drive component 3 and the entire device; at the same time, the active compression plate 2 and the active compression plate 4 can respectively perform fatigue tests on different spring groups with different cycles and compression amounts, improving the testing functionality and practicality.

[0028] The driving component 3 includes a pull rod 14 fixedly connected to the active compression plate 2, and a sliding sleeve 15 fixedly connected inside the test platform 1. One end of the pull rod 14 slides through the sliding sleeve 15 to guide and limit the sliding of the pull rod 14. A rectangular frame 16 is fixedly connected to one end of the pull rod 14. A dual-axis motor 17 is fixedly connected inside the test platform 1. A circular plate 18 is fixedly connected to the output shaft of the dual-axis motor 17. A guide wheel 19 is provided on the circular plate 18. One end of the guide wheel 19 is located inside the rectangular frame 16 and is slidably connected to its inner wall. A certain distance is maintained between the guide wheel 19 and the center of the circular plate 18. Twice the distance is equal to the compression length of the test spring. The dual-axis motor 17 is started to drive the circular plate 18 to rotate, which in turn drives the guide wheel 19 to follow the circular plate 18 to make a circular motion, thereby driving the pull rod 14 fixedly connected to the rectangular frame 16 to make a reciprocating motion, so as to drive the active compression plate 2 to make a reciprocating motion to compress the test spring.

[0029] Two L-shaped guide plates 32 are symmetrically fixedly connected to the circular plate 18. An H-shaped plate 33 is slidably connected to the circular plate 18, and the H-shaped plate 33 is rotatably connected to the guide wheel 19 through a rotating shaft. One end of the guide plate 32 is located inside the H-shaped plate 33 and is slidably connected to its inner wall, which is used to guide and limit the sliding of the H-shaped plate 33.

[0030] A shaft 34 is rotatably connected to the circular plate 18, and a screw 27 is fixedly connected to the shaft 34. One end of the screw 27 passes through the H-shaped plate 33 and is threadedly connected to it. A drive motor 35 is fixedly connected to the circular plate 18, and the output shaft of the drive motor 35 is fixedly connected to the shaft 34. Specifically, by starting the drive motor 35, the shaft 34 is rotated, which in turn drives the screw 27 to rotate, thereby causing the guide wheel 19 on the H-shaped plate 33 to move relative to the center of the circular plate 18. This adjusts the distance between the guide wheel 19 and the center of the circular plate 18, which means that the distance between the guide wheel 19 and the center of the circular plate 18 can be adjusted according to the compression of the spring to be tested, so as to improve the adaptability of the device.

[0031] The linkage 5 includes an L-shaped support plate 23 fixedly connected to both ends of the active extrusion plate 2 4. A roller 24 is rotatably connected to the L-shaped support plate 23 via a rotating shaft. A right-angled triangular block 25 is fixedly connected to the active extrusion plate 2. The edge of the right-angled triangular block 25 contacts and abuts against the roller 24. When the active extrusion plate 2 is moved, the edge of the right-angled triangular block 25 pushes the roller 24 to move, thereby driving the active extrusion plate 2 4 connected to the L-shaped support plate 23 to move.

[0032] Specifically, during normal operation, when the active compression plate 12 is positioned between the two passive compression plates 13, the compression of the test springs on both sides is x%. That is, at this time, the compression of the test springs on both sides of the compression plate is equal and is half of the preset compression. At the same time, the right-angled end of the right-angled triangular block 25 on the active compression plate 12 contacts and abuts against the roller 24. Meanwhile, the compression of the test spring on one side of the active compression plate 24 is also x%. Subsequently, when the active compression plate 12 moves, it begins to compress the test spring on one side while releasing the test spring on the other side. During this process, the released test spring resets and assists in pushing the active compression plate 12 to move. At the same time, the test spring on one side of the active compression plate 24 is also released, which in turn assists in pushing the active compression plate 12 to move, thereby reducing the load on the drive component 3 and improving the stability of the device during operation.

[0033] In this process, while the active compression plate 2 compresses the test spring on one side to a preset compression amount of 2x%, the test spring on the other side is completely released, that is, the compression amount is 0. Then, as the active compression plate 2 is brought to the position between the two passive compression plates 13 by the driving component 3, the spring on one side with a compression amount of 2x% is reset to assist in pushing the active compression plate 2. At the same time, the movement of the active compression plate 2 will compress the test spring on the other side, and at the same time compress the test spring on one side of the active compression plate 2 4.

[0034] Specifically, in this device, the number of test springs on both sides of the active compression plate 2 remains equal; and the total number of test springs on both sides of the active compression plate 2 is consistent with the number of test springs on one side of the active compression plate 4. This design ensures that during the process of the spring on one side of the active compression plate 2 releasing from full compression (2x%) to half compression (x%), the test spring on the other side of the active compression plate 4 absorbs part of the released elastic potential energy and converts it into the power to propel the active compression plate 2 to continue moving, assisting in completing the full compression of the test spring on the other side from x% to 2x%, forming a "release-absorption-re-" cycle. The "release" energy closed loop significantly reduces the energy consumption of the drive component 3 and improves energy utilization efficiency. Through the coordinated energy transfer of the test springs on both sides and the active compression plate 4, the drive component 3 is prevented from being overloaded on one side, reducing mechanical vibration and wear. At the same time, the movement of the active compression plate 2 is made smoother, and the compression / release process of the test spring is more synchronized, which improves the overall stability of the device and the reliability of the test results. Energy recycling reduces the working intensity of the drive component 3 and its components, reduces fatigue wear caused by high load and high frequency of movement, and thus extends the service life of the drive component 3 and the entire device.

[0035] Both passive compression plates 13 are slidably connected to the slide rod 12. A shaft 26 is rotatably connected to the mounting plate 11. Two screws 27 with opposite thread directions are fixedly connected to the shaft 26, and the two screws 27 pass through the two passive compression plates 13 and are threaded to them. A drive motor 28 is fixedly connected to the mounting plate 11. The output shaft of the drive motor 28 is fixed to the shaft 26. Starting the drive motor 28 drives the shaft 26 to rotate, which in turn drives the two screws 27 to rotate, thereby moving the two passive compression plates 13 toward the active compression plate 2 to compress the test spring. Specifically, through program design, input... The test spring values ​​are then determined. A set of test springs is placed between the active compression plate 12 and the passive compression plate 13, while another set is placed between the active compression plate 24 and the passive compression plate 22. Subsequently, the drive motor 28 is rotated via a program control system, causing the two active compression plates 22 to move synchronously and compress the test springs. Specifically, the test springs are compressed to half of the preset compression amount. During this process, the rotation of shaft 26 drives shaft 29 to rotate via the helical gear disc 31, which in turn drives the passive compression plate 22 to move via the screw 27, compressing this set of test springs to the preset compression amount.

[0036] A shaft 29 is rotatably connected to the mounting plate 11. One end of the shaft 29 slides through the active compression plate 4 and is also fixedly connected to a screw 27. One end of the screw 27 passes through the passive compression plate 22 and is threadedly connected to it. A helical gear 31 is fixedly connected to one end of the shaft 29. A helical gear 31 is also fixedly connected to the shaft 26. The two helical gears 31 mesh to compress one set of test springs while the passive compression plate 13 compresses one set of test springs, and the compression is equal.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A high-cycle fatigue limit testing device comprising a test table (1) and a mounting plate (11) provided on the test table (1), characterized in that, Also include: Active extrusion plate one (2), slidingly disposed on the mounting plate (11), for extruding test springs; Drive member (3), disposed on the test bench (1) and connected with the active extrusion plate one (2), for driving the active extrusion plate one (2) to move back and forth, so as to perform n cycles and each compression of 2x% fatigue test on a group of test springs on it; Active extrusion plate two (4), slidingly disposed on the mounting plate (11), also for extruding test springs; Linkage (5), disposed on the mounting plate (11), and the active extrusion plate two (4) is connected with the active extrusion plate one (2) through the linkage (5), for driving the active extrusion plate two (4) to move back and forth when the active extrusion plate one (2) moves, so as to perform 2n cycles and each compression of x% fatigue test on a group of test springs on it; The linkage (5) includes an L-shaped plate (23) fixedly connected at both ends of the active extrusion plate two (4), the L-shaped plate (23) is rotatably connected with a roller (24) through a rotating shaft, and a right triangle block (25) is fixedly connected on the active extrusion plate one (2), the edge of the right triangle block (25) is in contact with the roller (24) to resist the movement of the roller (24) when the active extrusion plate one (2) moves, so as to drive the active extrusion plate two (4) to move.

2. The high-cycle fatigue limit testing apparatus according to claim 1, characterized by: The mounting plate (11) is fixedly connected with two slide rods (12) symmetrically, the slide rods (12) slide through the end of the active extrusion plate one (2), and the passive extrusion plate one (13) is arranged on both sides of the active extrusion plate one (2), and the gap between the passive extrusion plate one (13) and the active extrusion plate one (2) is used for installing test springs, so as to alternately extrude the test springs on both sides of the active extrusion plate one (2) when the active extrusion plate one (2) moves, and simultaneously release the test springs on both sides.

3. The high-cycle fatigue limit testing apparatus according to claim 2, characterized by: The drive member (3) includes a pull rod (14) fixedly connected with the active extrusion plate one (2), and a slide sleeve (15) is fixedly connected in the test bench (1), one end of the pull rod (14) slides through the slide sleeve (15), one end of the pull rod (14) is fixedly connected with a rectangular frame (16), a double-shaft motor (17) is fixedly connected in the test bench (1), a circular plate (18) is fixedly connected on the output shaft of the double-shaft motor (17), a guide wheel (19) is arranged on the circular plate (18), one end of the guide wheel (19) is located in the rectangular frame (16), and the double-shaft motor (17) is started to drive the active extrusion plate one (2) to move.

4. The high-cycle fatigue limit testing apparatus according to claim 3, characterized by: The mounting plate (11) is fixedly connected with a guide rod (21), the guide rod (21) is provided with a passive extrusion plate two (22) at one end, the active extrusion plate two (4) is slidingly connected with the guide rod (21), and the gap between the passive extrusion plate two (22) and the active extrusion plate two (4) is used for installing test springs.

5. The high-cycle fatigue limit testing apparatus according to claim 4, characterized by: Two passive extrusion plate (13) are connected with the slide bar (12) slidingly, the mounting plate (11) is rotatably connected with shaft (26), the shaft (26) is fixedly connected with two screw rods (27) with opposite screw directions, and the two screw rods (27) correspond to pass through two passive extrusion plate (13) and are connected with the same by screw thread, the mounting plate (11) is fixedly connected with drive motor (28), the output shaft of drive motor (28) is fixed with shaft (26), the drive motor (28) is started to drive two passive extrusion plate (13) to move to the active extrusion plate (2), so as to compress the test spring.

6. The high-cycle fatigue limit testing apparatus of claim 5, wherein: The mounting plate (11) is rotatably connected with shaft (29), one end of the shaft (29) is slidably connected with the active extrusion plate (4) and is also fixedly connected with the screw rod (27), one end of the screw rod (27) passes through the passive extrusion plate (22) and is connected with the same by screw thread, and one end of the shaft (29) is fixedly connected with the helical gear (31), the shaft (26) is also fixedly connected with the helical gear (31), the two helical gears (31) are engaged, for driving the passive extrusion plate (22) to compress another group of test springs while the passive extrusion plate (13) compresses a group of test springs, and the compression degree is equal.

7. The high-cycle fatigue limit testing apparatus of claim 6, wherein: The circular plate (18) is fixedly connected with two guide plates (32) with L-shaped cross section symmetrically, the circular plate (18) is slidably connected with the H-shaped plate (33), and the H-shaped plate (33) is rotatably connected with the guide wheel (19) through the rotating shaft, one end of the guide plate (32) is located in the H-shaped plate (33) and is slidably connected with the inner wall thereof, for guiding and limiting the sliding of the H-shaped plate (33); And the circular plate (18) is rotatably connected with shaft (34), the shaft (34) is also fixedly connected with screw rod (27), one end of the screw rod (27) passes through the H-shaped plate (33) and is connected with the same by screw thread, and the circular plate (18) is fixedly connected with drive motor (35), the output shaft of drive motor (35) is fixed with shaft (34).

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