Pure bending fatigue specimen moment locking device and pure bending fatigue machine

Abstract

This utility model discloses a bending moment locking device and a pure bending fatigue tester for a pure bending fatigue specimen, relating to the field of mechanical testing technology. It includes: multiple limiting rods, a first positioning baffle, a second positioning baffle, and multiple first limiting blocks, with each limiting rod arranged in parallel. The first positioning baffle is connected to one end of a limiting rod and can be positioned along the length of the limiting rod. The second positioning baffle is arranged parallel to the first positioning baffle and is slidably connected to the limiting rod, maintaining its slidable position. The first limiting block is fixedly connected to the end of the limiting member away from the first positioning baffle and is located on the side of the second limiting baffle away from the first limiting baffle. The distance between the two opposite sides of the first and second positioning baffles when the second positioning baffle and the first limiting block are pressed together is the standard lever arm length. The structure is simple, easy to use, and effectively ensures the accuracy of the test data.

Description

Technical Field

[0001] This utility model relates to the field of mechanical testing technology, and in particular to a bending moment locking device for a pure bending fatigue specimen and a pure bending fatigue machine. Background Technology

[0002] In the field of mechanical testing technology, the PQ1-6 pure bending fatigue testing machine is commonly used to determine the bending fatigue limit δ-1 and torsional fatigue limit τ-1 of metallic materials. However, the method of using spring chucks to lock the specimen in this testing machine has a significant drawback: as the spring chuck locking nut is tightened, the right spindle box moves towards the left spindle box, thus changing the standard lever arm length of the specimen. To ensure high accuracy of the bending moment during the test (bending moment accuracy has a significant impact on pure bending fatigue testing; inaccurate bending moments will seriously affect the testing accuracy), the existing operating method requires multiple disassembly and reassembly of the specimen each time it is clamped, and repeated adjustments to the clamping position of the specimen in the spring chuck to align it with the standard position scale on the equipment. This greatly reduces work efficiency, and there is an urgent need for a device that can accurately lock the specimen lever arm length to ensure the accuracy of the test data. Utility Model Content

[0003] The purpose of this invention is to provide a bending moment locking device for a pure bending fatigue specimen and a pure bending fatigue machine to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively ensures the accuracy of test data.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a bending moment locking device for a pure bending fatigue specimen, comprising: multiple limiting rods, a first positioning baffle, a second positioning baffle, and multiple first limiting blocks, wherein each limiting rod is arranged in parallel; the first positioning baffle is connected to one end of the limiting rod and can be positioned in the length direction of the limiting rod; the second positioning baffle is arranged in parallel with the first positioning baffle, and the second positioning baffle is slidably connected to the limiting rod and can maintain the position after sliding; the first limiting block is fixedly connected to the end of the limiting rod away from the first positioning baffle, and is located on the side of the second positioning baffle away from the first positioning baffle, such that when the second positioning baffle and the first limiting block are pressed together, the distance between the two opposite sides of the first positioning baffle and the second positioning baffle is the standard lever arm length.

[0006] Preferably, the limiting rod includes an integrally connected round rod segment and a first threaded segment. The end of the round rod segment away from the first threaded segment is used to be rotatably connected to the first positioning baffle. The second positioning baffle is provided with a plurality of threaded holes. The first threaded segment is used to be threadedly connected to the threaded holes. The end of the threaded end passing through the threaded hole is fixedly connected to the first limiting block.

[0007] Preferably, the limiting rod further includes an external hexagonal nut, which is fixedly connected to one end of the round rod section near the first threaded section.

[0008] Preferably, the external hexagonal nut is welded and fixedly connected to the round rod segment.

[0009] Preferably, the limiting rod further includes a locking nut and a second threaded section. The second threaded section is integrally connected to the end of the round rod segment away from the first threaded section. The first positioning baffle is provided with a plurality of T-shaped round holes. The second threaded section passes through the T-shaped round holes and is threadedly connected to the locking nut. The locking nut can restrict the first positioning baffle from moving away from the second positioning baffle.

[0010] Preferably, it also includes a plurality of second limiting blocks, the second limiting blocks being fixedly connected to one end of the round rod segment near the second threaded segment, so as to restrict the first positioning baffle from moving in the direction of moving closer to the second positioning baffle.

[0011] Preferably, the first limiting block is welded and fixedly connected to the first threaded segment, and the second limiting block is welded and fixedly connected to the round rod segment.

[0012] Preferably, a first mounting groove is provided on one side of the first positioning baffle, and a second mounting groove is provided on one side of the second positioning baffle. The first mounting groove and the second mounting groove are respectively fitted onto the outer sleeves of the left and right spring collets of the pure bending fatigue machine facing each other.

[0013] This utility model also provides a pure bending fatigue machine, including: a pure bending fatigue specimen bending moment locking device as described in any of the above claims;

[0014] The present invention achieves the following technical advantages over the prior art:

[0015] This invention provides a bending moment locking device for a pure bending fatigue specimen and a pure bending fatigue tester. By setting multiple parallel limiting rods, a sliding and fixed first positioning baffle and a second positioning baffle, and a first limiting block that plays a positioning role, the standard lever arm length can be accurately determined, providing an accurate lever arm setting basis for pure bending fatigue testing and improving the accuracy and reliability of the test. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A front view of the bending moment locking device for a pure bending fatigue specimen provided by this utility model;

[0018] Figure 2 A side view of the bending moment locking device for a pure bending fatigue specimen provided by this utility model.

[0019] Figure 3 A top view of the bending moment locking device for a pure bending fatigue specimen provided by this utility model.

[0020] Figure 4 A schematic diagram of the bending moment locking device for a pure bending fatigue specimen provided by this utility model during use;

[0021] In the diagram: 1. Limiting rod; 11. Round rod section; 12. First threaded section; 13. Second threaded section; 14. External hexagonal nut; 15. Locking nut; 2. First positioning baffle; 3. Second positioning baffle; 4. First limiting block; 5. Second limiting block; 6. Threaded hole; 7. T-shaped round hole; 8. First mounting slot; 9. Second mounting slot; 21. Left spring collet locking nut; 22. Left spindle box; 23. Left spring collet; 24. Sample; 25. Right spring collet; 26. Right spindle box; 27. Right spring collet locking nut; 28. Right spindle box guide block; 29. ​​Guide groove; 30. Right support frame; 31. Right hook; 32. Left hook; 33. Left spindle box rotating bearing; 34. Left support frame. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The purpose of this invention is to provide a bending moment locking device for a pure bending fatigue specimen and a pure bending fatigue machine to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively ensures the accuracy of test data.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] This embodiment provides a 24-bending-moment locking device for a pure bending fatigue specimen, such as... Figures 1-4 As shown, the device includes: multiple limiting rods 1, a first positioning baffle 2, a second positioning baffle 3, and multiple first limiting blocks 4. Each limiting rod 1 is arranged in parallel. The first positioning baffle 2 is connected to one end of the limiting rod 1 and can be positioned along the length of the limiting rod 1. The second positioning baffle 3 is arranged parallel to the first positioning baffle 2, and is slidably connected to the limiting rod 1, maintaining its slidable position. The first limiting block 4 is fixedly connected to the end of the limiting rod away from the first positioning baffle 2 and is located on the side of the second positioning baffle away from the first positioning baffle. The distance between the two opposite sides of the first positioning baffle 2 and the second positioning baffle 3 when the second positioning baffle 3 and the first limiting block 4 are pressed together is the standard lever arm length. By setting multiple parallel limiting rods 1, slidable and fixed-position first positioning baffles 2 and 3, and first limiting blocks 4 that serve a positioning function, the standard lever arm length can be accurately determined, providing an accurate lever arm setting basis for pure bending fatigue testing and improving the accuracy and reliability of the test.

[0027] In a preferred embodiment, the limiting rod 1 includes an integrally connected round rod segment 11 and a first threaded segment 12. The end of the round rod segment 11 away from the first threaded segment 12 is used to rotatably connect with the first positioning baffle 2. The second positioning baffle 3 is provided with a plurality of threaded holes 6. The first threaded segment 12 is used to be threadedly connected with the threaded holes 6, and the threaded end passing through the threaded hole 6 is fixedly connected with the first limiting block 4. This structural design allows the limiting rod 1 and the first positioning baffle 2 to rotate flexibly, facilitating the adjustment of the overall state of the device. At the same time, the threaded connection between the first threaded segment 12 and the second positioning baffle 3 allows for precise adjustment of the position of the second positioning baffle 3 on the limiting rod 1 by rotation, thereby ensuring the accurate setting of the standard lever arm length.

[0028] In a preferred embodiment, the limiting rod 1 further includes an external hexagonal nut 14, which is fixedly connected to one end of the round rod section 11 near the first threaded section 12. The external hexagonal nut 14 facilitates the operation of the limiting rod 1 by the operator using tools. By rotating the external hexagonal nut 14, the limiting rod 1 can be easily driven to move, which helps to adjust the position of the second positioning baffle 3 more efficiently and enhances the operability of the device.

[0029] In a preferred embodiment, the external hexagonal nut 14 is welded and fixedly connected to the round rod segment 11. Welding ensures the stability of the connection between the external hexagonal nut 14 and the round rod segment 11, preventing loosening and separation during use, thus ensuring the structural stability of the device and enabling long-term stable adjustment of the standard lever arm length.

[0030] In a preferred embodiment, the limiting rod 1 further includes a locking nut 15 and a second threaded section 13. The second threaded section 13 is integrally connected to the end of the round rod section 11 away from the first threaded section 12. The first positioning baffle 2 is provided with a plurality of T-shaped round holes 7. The second threaded section 13 passes through the T-shaped round holes 7 and is threadedly connected to the locking nut 15. The locking nut 15 can restrict the first positioning baffle 2 from moving away from the second positioning baffle 3. This structural design further enhances the locking function of the position of the first positioning baffle 2. Through the cooperation of the locking nut 15 and the second threaded section 13, the first positioning baffle 2 can be prevented from moving arbitrarily due to external forces or other factors during the test, thus ensuring the stability and accuracy of the standard lever arm length during the test.

[0031] In a preferred embodiment, a plurality of second limiting blocks 5 are further included. The second limiting blocks 5 are fixedly connected to one end of the round rod segment 11 near the second threaded segment 13 to restrict the first positioning baffle from moving towards the second positioning baffle. The setting of the second limiting blocks 5 plays a bidirectional limiting role on the movement range of the first positioning baffle 2, preventing the first positioning baffle 2 from getting too close to the second positioning baffle 3, and further precisely controlling the distance range between the first and second positioning baffles 3, ensuring that the setting of the standard lever arm length is more accurate and reliable.

[0032] In a preferred embodiment, the first limiting block 4 is welded and fixedly connected to the first threaded segment 12, and the second limiting block 5 is welded and fixedly connected to the round rod segment 11. The welding and fixing method ensures the stability of the connection between the first limiting block 4 and the first threaded segment 12, and between the second limiting block 5 and the round rod segment 11, avoiding loosening of the connection during frequent use and stress of the device, thereby ensuring the reliability of the entire device structure and ensuring that the accurate setting of the standard lever arm length is always maintained.

[0033] In a preferred embodiment, a first mounting groove 8 is provided on one side of the first positioning baffle, and a second mounting groove 9 is provided on one side of the second positioning baffle. The first mounting groove 8 and the second mounting groove 9 are respectively fitted onto the outer sleeves of the left spring collet 23 and the right spring collet 25 of the pure bending fatigue machine on their opposite sides. The first mounting groove 8 and the second mounting groove 9 facilitate the connection and positioning of the device with the pure bending fatigue machine, enabling the device to be installed on the pure bending fatigue machine quickly and accurately. Furthermore, through cooperation with the outer sleeves of the spring collets, the stability of the connection between the device and the fatigue machine during the test is ensured, which is beneficial to improving the accuracy of the test data.

[0034] Example 2

[0035] This utility model also provides a pure bending fatigue machine, including: a bending moment locking device for the pure bending fatigue specimen 24 as in Embodiment 1, a left spring collet locking nut 21, a left spindle box 22, a left spring collet 23, a right spring collet 25, a right spindle box 26, a right spring collet locking nut 27, a right spindle box guide block 28, a guide groove 29, a right support frame 30, a right hook 31, a left hook 32, a left spindle box rotating bearing 33, and a left support frame 34. Applying the bending moment locking device for the pure bending fatigue specimen 24 to the pure bending fatigue machine allows the fatigue machine to accurately set the standard lever arm length of the specimen 24, improving the accuracy and repeatability of the fatigue test. Simultaneously, the coordinated operation of each component ensures the normal operation of the fatigue machine and allows it to apply a stable pure bending load to the specimen 24, meeting the fatigue test requirements of different specimens 24 and improving the versatility and reliability of the equipment.

[0036] Example 3

[0037] This embodiment also provides a method for using the bending moment locking device for a pure bending fatigue specimen 24 as described above, including the following steps:

[0038] During the pure bending fatigue test, the right hook 31 and the left hook 32 are removed to unload the load, allowing the spindle box to rotate around the left support frame 34 via the bearing. At the same time, the right spindle box 26 can rotate around the guide groove 29 via the right spindle box guide block 28, which facilitates the installation of the specimen 24. Unloading the load and allowing the spindle box to rotate greatly reduces the difficulty of installing the specimen 24, avoids the dangers and inconveniences that may arise from installing the specimen 24 under load, and improves the safety and convenience of the specimen 24 installation operation.

[0039] The clamping ends of the sample 24 are inserted into the inner sleeves of the left spring collet 23 and the right spring collet 25, respectively, and then respectively clamped into the outer sleeves of the corresponding spring collets. This clamping method of the sample 24 can stably fix the sample 24, ensuring that the sample 24 will not shake or fall off during the test, thus ensuring the smooth progress of the test and the accuracy of the test data.

[0040] The first mounting slot 8 on the first positioning baffle 2 and the second mounting slot 9 on the second positioning baffle 3 are respectively mounted on the inner side of the outer sleeve of the left spring collet 23 and the right spring collet 25, such as Figure 4 As shown. The first mounting slot 8 and the second mounting slot 9 are fitted into the inner side of the spring collet jacket, which further enhances the connection stability between the device and the fatigue machine, helps to accurately transmit force and motion during the test, and ensures that the accuracy of the standard lever arm length is not affected by unstable connection factors.

[0041] Rotate each external hexagonal nut 14 at the same angle simultaneously, so that the second positioning baffle 3 is tightly against the inner side of the first positioning block, and the first positioning baffle 2 is tightly against the outer side of the second positioning block. At this time, the distance between the outer edge of the first positioning baffle 2 and the outer edge of the second positioning baffle 3 is the standard lever arm length of the sample 24. By rotating each external hexagonal nut 14 at the same time to adjust the position of the positioning baffle, the standard lever arm length can be set accurately and synchronously. The operation is simple and can ensure that the force on each part is uniform, thus improving the accuracy and consistency of the lever arm length setting.

[0042] Use the left spring collet locking nut 21 to clamp the left clamping end of the sample 24 to a suitable force, and then use the right spring collet locking nut 27 to clamp the right clamping end of the sample 24 to a suitable force. By adjusting the left and right spring collet locking nuts 27 to clamp the sample 24, the clamping force can be adjusted according to different requirements such as the material and specifications of the sample 24, ensuring that the sample 24 is firmly fixed during the test and will not be damaged or the test data will be inaccurate due to improper clamping force, thus ensuring the reliability of the test results.

[0043] Rotate each external hexagonal nut 14 simultaneously in opposite directions at the same angle to disengage the first positioning baffle 2 and the second positioning baffle 3 from the left and right spring clamps 25, thus completing the mounting of the specimen 24 for the pure bending fatigue test. After removing the device, the pure bending fatigue test can be started according to the operating procedure. After the specimen 24 is mounted, the bending moment locking device can be quickly removed to avoid interference with the fatigue test process. It also facilitates the smooth mounting operation for the next use, thus improving the test efficiency.

[0044] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A bending moment locking device for a pure bending fatigue specimen, characterized in that: include: Multiple limiting rods, all of which are arranged in parallel; A first positioning baffle is connected to one end of the limiting rod and can be positioned in the length direction of the limiting rod. The second positioning baffle is arranged parallel to the first positioning baffle, and the second positioning baffle is slidably connected to the limiting rod and can maintain the position after sliding. as well as Multiple first limiting blocks are fixedly connected to the end of the limiting rod away from the first positioning baffle and located on the side of the second positioning baffle away from the first positioning baffle, such that the distance between the two opposite sides of the first positioning baffle and the second positioning baffle when the second positioning baffle and the first limiting block are pressed together is the standard lever arm length.

2. The bending moment locking device for a pure bending fatigue specimen according to claim 1, characterized in that: The limiting rod includes an integrally connected round rod segment and a first threaded segment. The end of the round rod segment away from the first threaded segment is used to be rotatably connected to the first positioning baffle. The second positioning baffle is provided with a plurality of threaded holes. The first threaded segment is used to be threadedly connected to the threaded holes. The end of the first threaded segment passing through the threaded holes is fixedly connected to the first limiting block.

3. The bending moment locking device for a pure bending fatigue specimen according to claim 2, characterized in that: The limiting rod also includes an external hexagonal nut, which is fixedly connected to one end of the round rod section near the first threaded section.

4. The bending moment locking device for a pure bending fatigue specimen according to claim 3, characterized in that: The external hexagonal nut is welded and fixedly connected to the round rod section.

5. The bending moment locking device for a pure bending fatigue specimen according to claim 4, characterized in that: The limiting rod also includes a locking nut and a second threaded section. The second threaded section is integrally connected to the end of the round rod section away from the first threaded section. The first positioning baffle is provided with a plurality of T-shaped round holes. The second threaded section passes through the T-shaped round holes and is threadedly connected to the locking nut. The locking nut can restrict the first positioning baffle from moving away from the second positioning baffle.

6. The bending moment locking device for a pure bending fatigue specimen according to claim 5, characterized in that: It also includes multiple second limiting blocks, which are fixedly connected to one end of the round rod segment near the second threaded segment to restrict the first positioning baffle from moving towards the second positioning baffle.

7. The bending moment locking device for a pure bending fatigue specimen according to claim 6, characterized in that: The first limiting block is welded and fixedly connected to the first threaded section, and the second limiting block is welded and fixedly connected to the round rod section.

8. The bending moment locking device for a pure bending fatigue specimen according to claim 1, characterized in that: The first positioning baffle has a first mounting groove on one side, and the second positioning baffle has a second mounting groove on one side. The first mounting groove and the second mounting groove are respectively fitted onto the outer sleeves of the left and right spring collets of the pure bending fatigue machine.

9. A pure bending fatigue machine, characterized in that: include: The bending moment locking device for a pure bending fatigue specimen as described in any one of claims 1 to 8.

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