Pure bending fatigue sample bending moment locking device, pure bending fatigue machine and use method

Abstract

The invention discloses a pure bending fatigue sample bending moment locking device, a pure bending fatigue machine and a use method, and relates to the technical field of mechanical detection.The pure bending fatigue sample bending moment locking device comprises a plurality of limiting rods, a first positioning baffle, a second positioning baffle and a plurality of first limiting blocks, and the limiting rods are arranged in parallel; the first positioning baffle is connected with one end of the limiting rod and can be located at the position in the length direction of the limiting rod. The second positioning baffle and the first positioning baffle are arranged in parallel, and the second positioning baffle is in sliding connection with the limiting rod and can keep the position after sliding; the first limiting block is fixedly connected to the end, away from the first positioning baffle, of the limiting piece and located on the side, away from the first limiting baffle, of the second limiting baffle, so that when the second positioning baffle abuts against the first limiting block, the distance between the two side faces, away from each other, of the first positioning baffle and the second positioning baffle is the length of a standard force arm. Usage is convenient, and test data precision is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical testing, and particularly relates to a bending moment locking device for a pure bending fatigue specimen, a pure bending fatigue machine, and a usage method thereof. Background Art

[0002] In the technical field of mechanical testing, the PQ1-6 pure bending fatigue testing machine is commonly used to measure the bending fatigue limit δ-1 and torsional fatigue limit τ-1 of metal materials. However, the method of using a spring collet to lock the specimen in this testing machine has obvious defects: as the spring collet locking nut is tightened, the right main spindle box will move towards the left main spindle box, thereby changing the standard force arm length of the specimen. To ensure high precision of the bending moment in the test (the bending moment precision has a significant impact on the pure bending fatigue test, and inaccurate bending moment will seriously affect the detection precision), the existing operation method requires disassembling and reassembling the specimen multiple times and repeatedly adjusting the clamping position of the specimen in the spring collet each time the specimen is loaded, in order to align with the standard position scale on the equipment, which greatly reduces the work efficiency. There is an urgent need for a device that can accurately lock the force arm length of the specimen to ensure the precision of test data. Summary of the Invention

[0003] The purpose of the present invention is to provide a bending moment locking device for a pure bending fatigue specimen, a pure bending fatigue machine, and a usage method thereof, so as to solve the problems existing in the above-mentioned prior art, with a simple structure, convenient to use, and effectively ensuring the precision of test data.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The present invention provides a bending moment locking device for a pure bending fatigue specimen, including: a plurality of limiting rods, a first positioning baffle, a second positioning baffle, and a plurality of first limiting blocks, wherein the limiting rods are arranged in parallel; the first positioning baffle is connected to one end of the limiting rod and can fix the position in the length direction of the limiting rod; the second positioning baffle is arranged in parallel with the first positioning baffle, 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 member away from the first positioning baffle and is located on the side of the second limiting baffle away from the first limiting baffle, so that when the second positioning baffle abuts against the first limiting block, the distance between the mutually facing sides of the first positioning baffle and the second positioning baffle is the standard force arm length.

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

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

[0008] Preferably, the external hexagonal nut is fixedly connected to the round rod section by welding.

[0009] Preferably, the limiting rod further includes a locking nut and a second threaded section. The second threaded section is integrally connected to one end of the round rod section far 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 limit the first positioning baffle from moving in a direction away from the second positioning baffle.

[0010] Preferably, it further includes a plurality of second limiting blocks, and the second limiting blocks are fixedly connected to one end of the round rod section close to the second threaded section to limit the first limiting baffle from moving in a direction close to the second limiting baffle.

[0011] Preferably, the first limiting block is fixedly connected to the first threaded section by welding, and the second limiting block is fixedly connected to the round rod section by welding.

[0012] Preferably, a first installation slot is provided on one side of the first limiting baffle, and a second installation slot is provided on one side of the second limiting baffle. The first installation slot and the second installation slot are respectively sleeved on the outer sleeves on the opposite sides of the left spring chuck and the right spring chuck of the pure bending fatigue machine.

[0013] The present invention also provides a pure bending fatigue machine, including: the pure bending fatigue specimen bending moment locking device as described in any one of the above.

[0014] The present invention also provides a method for using the pure bending fatigue specimen bending moment locking device as described in any one of the above, including the following steps:

[0015] The clamping ends of the specimen are respectively inserted into the inner sleeves of the left spring chuck and the right spring chuck of the pure bending fatigue machine, and then respectively clamped into the outer sleeves corresponding to the left spring chuck and the right spring chuck.

[0016] The first positioning baffle and the second positioning baffle are respectively clamped and slidably connected inside the outer sleeves of the left spring chuck and the right spring chuck.

[0017] The second positioning baffle is slid in a direction away from the first positioning baffle until the second positioning baffle abuts against the first limiting block. At this time, the distance between the outer edge of the first positioning baffle and the outer edge of the second positioning baffle is the standard force arm length of the specimen.

[0018] Adjust the locking nut of the left spring chuck of the pure bending fatigue machine to clamp the left clamping end of the specimen with appropriate force, and then use the locking nut of the right spring chuck to clamp the right clamping end of the specimen with appropriate force;

[0019] Slide the second positioning baffle towards the first positioning baffle to disengage the first positioning baffle and the second positioning baffle from the left spring chuck and the right spring chuck, complete the specimen clamping work for the pure bending fatigue experiment, remove this device, and then the pure bending fatigue test can be started according to the operating procedures.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The present invention provides a bending moment locking device for a pure bending fatigue specimen, a pure bending fatigue machine and a using method. By setting a plurality of parallel limiting rods, a first positioning baffle and a second positioning baffle that are slidable and can fix positions, and a first limiting block for positioning, the standard force arm length can be accurately determined, providing an accurate force arm setting basis for the pure bending fatigue test and improving the accuracy and reliability of the test. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is the front view of the bending moment locking device for a pure bending fatigue specimen provided by the present invention;

[0024] Figure 2 It is the side view of the bending moment locking device for a pure bending fatigue specimen provided by the present invention;

[0025] Figure 3 It is the top view of the bending moment locking device for a pure bending fatigue specimen provided by the present invention;

[0026] Figure 4 It is the structural schematic diagram when the bending moment locking device for a pure bending fatigue specimen provided by the present invention is in use;

[0027] In the figure: 1. Limit rod; 11. Round rod section; 12. First threaded section; 13. Second threaded section; 14. External hexagon nut; 15. Locking nut; 2. First positioning baffle; 3. Second positioning baffle; 4. First limit block; 5. Second limit block; 6. Threaded hole; 7. T-shaped round hole; 8. First installation slot; 9. Second installation slot; 21. Left spring collet locking nut; 22. Left main spindle box; 23. Left spring collet; 24. Specimen; 25. Right spring collet; 26. Right main spindle box; 27. Right spring collet locking nut; 28. Right main spindle box guide block; 29. Guide groove; 30. Right support frame; 31. Right hook; 32. Left hook; 33. Left main spindle box rotating bearing; 34. Left support frame. Detailed implementation mode

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The purpose of the present invention is to provide a pure bending fatigue specimen bending moment locking device, a pure bending fatigue machine and a use method, so as to solve the problems existing in the above-mentioned prior art, with simple structure, convenient use, and effectively ensuring the accuracy of test data.

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0031] Embodiment 1

[0032] This embodiment provides a pure bending fatigue specimen 24 bending moment locking device, as Figures 1 to 4As shown in the figure, it includes: a plurality of limiting rods 1, a first positioning baffle 2, a second positioning baffle 3 and a plurality of 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 fix the position in the length direction of the limiting rod 1; the second positioning baffle 3 is arranged parallel to the first positioning baffle 2, and the second positioning baffle 3 is slidably connected to the limiting rod 1 and can maintain the position after sliding; the first limiting block 4 is fixedly connected to the end of the limiting member away from the first positioning baffle 2 and is located on the side of the second limiting baffle away from the first limiting baffle. When the second positioning baffle 3 abuts against the first limiting block 4, the distance between the mutually remote side surfaces of the first positioning baffle 2 and the second positioning baffle 3 is used as the standard arm length. By providing a plurality of parallel limiting rods 1, a first positioning baffle 2 and a second positioning baffle 3 that are slidable and can fix positions, and a first limiting block 4 that plays a positioning role, the standard arm length can be accurately determined, providing an accurate arm setting basis for the pure bending fatigue test and improving the accuracy and reliability of the test.

[0033] In a preferred solution of this embodiment, the limiting rod 1 includes an integrally connected round rod section 11 and a first threaded section 12. The end of the round rod section 11 away from the first threaded section 12 is used for rotatably connecting with the first positioning baffle 2. The second positioning baffle 3 is provided with a plurality of threaded holes 6. The first threaded section 12 is used for threadedly connecting with the threaded holes 6. The threaded end passing through one end of the threaded hole 6 is fixedly connected to the first limiting block 4. This structural design enables flexible rotation between the limiting rod 1 and the first positioning baffle 2, facilitating the adjustment of the overall state of the device; at the same time, the threaded connection method of the first threaded section 12 and the second positioning baffle 3 can precisely adjust the position of the second positioning baffle 3 on the limiting rod 1 by rotation, thereby ensuring the precise setting of the standard arm length.

[0034] In a preferred solution of this embodiment, the limiting rod 1 further includes an external hexagonal nut 14. The external hexagonal nut 14 is fixedly connected to the end of the round rod section 11 close to the first threaded section 12. The setting of the external hexagonal nut 14 facilitates the operator to operate the limiting rod 1 with tools. By rotating the external hexagonal nut 14, the limiting rod 1 can be conveniently driven to move, which helps to more efficiently adjust the position of the second positioning baffle 3 and enhances the operability of the device.

[0035] In a preferred solution of this embodiment, the external hexagonal nut 14 is fixedly connected to the round rod section 11 by welding. The welding method is used to fix the external hexagonal nut 14 and the round rod section 11, ensuring the stability of their connection, avoiding loosening and separation of the external hexagonal nut 14 and the round rod section 11 during the use of the device, ensuring the stability of the device structure, and enabling the long-term stable realization of the standard arm length adjustment function.

[0036] In a preferred embodiment of the present 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 one 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 limit the movement of the first positioning baffle 2 in the direction away from the second positioning baffle 3. This structural design further increases 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, it can prevent the first positioning baffle 2 from moving randomly due to external forces and other factors during the test, ensuring the stability and accuracy of the standard force arm length during the test.

[0037] In a preferred embodiment of the present embodiment, it further includes a plurality of second limiting blocks 5. The second limiting blocks 5 are fixedly connected to one end of the round rod section 11 close to the second threaded section 13 to limit the movement of the first limiting baffle in the direction close to the second limiting baffle. The setting of the second limiting blocks 5 plays a two-way limiting role in the movement range of the first positioning baffle 2, preventing the first positioning baffle 2 from approaching the second positioning baffle 3 excessively, and further precisely controlling the spacing range between the first and second positioning baffles 3, ensuring that the setting of the standard force arm length is more accurate and reliable.

[0038] In a preferred embodiment of the present embodiment, the first limiting block 4 is fixedly connected to the first threaded section 12 by welding, and the second limiting block 5 is fixedly connected to the round rod section 11 by welding. The welding fixing method ensures the stability of the connection between the first limiting block 4 and the first threaded section 12, and between the second limiting block 5 and the round rod section 11, avoiding loosening at the connection during the frequent use and loading process of the device, thereby ensuring the reliability of the entire device structure and ensuring that the precise setting of the standard force arm length is always maintained.

[0039] In a preferred embodiment of the present embodiment, a first mounting slot 8 is provided on one side of the first limiting baffle, and a second mounting slot 9 is provided on one side of the second limiting baffle. The first mounting slot 8 and the second mounting slot 9 are respectively sleeved on the outer sleeves of the opposite sides of the left spring chuck 23 and the right spring chuck 25 of the pure bending fatigue machine. The settings of the first mounting slot 8 and the second mounting slot 9 facilitate the connection and positioning of the device to the pure bending fatigue machine, can quickly and accurately install the device on the pure bending fatigue machine, and through the cooperation with the outer sleeve of the spring chuck, ensure the stability of the connection between the device and the fatigue machine during the test, which is beneficial to improving the accuracy of the test data.

[0040] Embodiment Two

[0041] The present invention also provides a pure bending fatigue machine, including: the bending moment locking device for the pure bending fatigue specimen 24 as in Embodiment 1, the left spring chuck locking nut 21, the left main spindle box 22, the left spring chuck 23, the right spring chuck 25, the right main spindle box 26, the right spring chuck locking nut 27, the right main spindle box guide block 28, the guide groove 29, the right support frame 30, the right hook 31, the left hook 32, the left main spindle box rotating bearing 33, and the left support frame 34. Applying the bending moment locking device for the pure bending fatigue specimen 24 to the pure bending fatigue machine enables the fatigue machine to accurately set the standard force arm length of the specimen 24, improving the accuracy and repeatability of the fatigue test. At the same time, each component cooperates with each other to ensure the normal operation of the fatigue machine and can apply a stable pure bending load to the specimen 24, meeting the fatigue test requirements of different specimens 24 and enhancing the versatility and reliability of the equipment.

[0042] Embodiment 3

[0043] This embodiment also provides a method for using the bending moment locking device for the pure bending fatigue specimen 24 as described in any one of the above, including the following steps:

[0044] During the pure bending fatigue experiment, remove the right hook 31 and the left hook 32, unload the load, so that the main spindle box can rotate around the left support frame 34 through the bearing, and at the same time, the right main spindle box 26 can also rotate around the guide groove 29 through the right main spindle box guide block 28, which is convenient for installing the specimen 24. Unloading the load and allowing the main spindle box to rotate greatly reduces the difficulty of installing the specimen 24, avoids the potential dangers and inconveniences that may occur when installing the specimen 24 under the condition of the equipment being loaded, and improves the safety and convenience of the specimen 24 installation operation.

[0045] The clamping ends of the specimen 24 are respectively inserted into the inner sleeves of the left spring chuck 23 and the right spring chuck 25, and then are respectively clamped into the outer sleeves of the corresponding spring chucks. This clamping method of the specimen 24 can stably fix the specimen 24, ensuring that the specimen 24 will not shake or break away during the test, and guaranteeing the smooth progress of the test and the accuracy of the test data.

[0046] 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 clamped inside the outer sleeves of the left spring chuck 23 and the right spring chuck 25, as Figure 4 shown. Clamping the first mounting slot 8 and the second mounting slot 9 inside the outer sleeve of the spring chuck 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 force arm length is not affected by unstable connection factors.

[0047] Rotate each external hexagonal nut 14 simultaneously at the same angle so that the second positioning baffle 3 closely abuts against the inner side of the first positioning block, and the first positioning baffle 2 closely abuts 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 force arm length of the specimen 24; by rotating each external hexagonal nut 14 simultaneously to adjust the position of the positioning baffle, the setting of the standard force arm length can be accurately and synchronously achieved, with simple operation and ensuring uniform force on each part, improving the accuracy and consistency of the force arm length setting.

[0048] Use the left spring chuck locking nut 21 to clamp the left clamping end of the specimen 24 to an appropriate tightness, and then use the right spring chuck locking nut 27 to clamp the right clamping end of the specimen 24 to an appropriate tightness. By adjusting the left and right spring chuck locking nuts 27 to clamp the specimen 24, the clamping force can be adjusted according to different requirements such as the material and specification of the specimen 24, ensuring that the specimen 24 is firmly fixed during the test and will not be damaged or the test data will not be inaccurate due to improper clamping force, guaranteeing the reliability of the test results.

[0049] Rotate each external hexagonal nut 14 simultaneously in the opposite direction at the same angle so that the first positioning baffle 2 and the second positioning baffle 3 are disengaged from the left and right spring chucks 25, completing the clamping work of the specimen 24 for the pure bending fatigue test. Remove this device, and then the pure bending fatigue test can be started according to the operating procedures. After the specimen 24 is clamped, the bending moment locking device can be quickly removed, avoiding interference of the device on the fatigue test process, and at the same time facilitating the smooth progress of the clamping operation during the next use, improving the test efficiency.

[0050] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A bending moment locking device for a pure bending fatigue specimen, characterized in that: Comprising: A plurality of limiting rods, each of the limiting rods being arranged in parallel; A first positioning baffle, the first positioning baffle being connected to one end of the limiting rod and capable of positioning in the length direction of the limiting rod; A second positioning baffle, the second positioning baffle being arranged in parallel with the first positioning baffle, the second positioning baffle being slidably connected to the limiting rod and capable of maintaining the position after sliding; And A plurality of first limiting blocks, the first limiting blocks being fixedly connected to the end of the limiting member away from the first positioning baffle and located on the side of the second limiting baffle away from the first limiting baffle, so that when the second positioning baffle abuts against the first limiting block, the distance between the mutually facing sides of the first positioning baffle and the second positioning baffle is the standard force arm length.

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

3. The bending moment locking device for pure bending fatigue specimens according to claim 2, characterized in that: The limiting rod further comprises an external hexagonal nut, the external hexagonal nut being fixedly connected to one end of the round rod section close to 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 fixedly connected to the round rod section by welding.

5. The bending moment locking device for a pure bending fatigue specimen according to claim 4, characterized in that: The limiting rod further comprises a locking nut and a second threaded section, the second threaded section being integrally connected to one 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, and the locking nut can limit the first positioning baffle from moving in the direction away from the second positioning baffle.

6. The bending moment locking device for pure bending fatigue specimens according to claim 5, characterized in that: It further comprises a plurality of second limiting blocks, the second limiting blocks being fixedly connected to one end of the round rod section close to the second threaded section to limit the first limiting baffle from moving in the direction close to the second limiting baffle.

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

8. The bending moment locking device for a pure bending fatigue specimen according to claim 1, characterized in that: One side of the first limiting baffle is provided with a first mounting slot, one side of the second limiting baffle is provided with a second mounting slot, and the first mounting slot and the second mounting slot are respectively sleeved on the outer sleeves on the opposite sides of the left spring chuck and the right spring chuck of the pure bending fatigue machine.

9. A pure bending fatigue machine, characterized in that: Comprising: The pure bending fatigue specimen bending moment locking device according to any one of claims 1 to 8.

10. A method for using a bending moment locking device for a pure bending fatigue specimen according to any one of claims 1 to 8, characterized in that: Comprising the following steps: The clamping ends of the specimen are respectively inserted into the inner sleeves of the left spring chuck and the right spring chuck of the pure bending fatigue machine, and then respectively clamped and installed into the outer sleeves corresponding to the left spring chuck and the right spring chuck; The first positioning baffle and the second positioning baffle are respectively clamped and slidably connected to the inner sides of the outer sleeves of the left spring chuck and the right spring chuck; The second positioning baffle is slid in the direction away from the first positioning baffle until the second positioning baffle abuts against the first limiting block. At this time, the distance between the outer edge of the first positioning baffle and the outer edge of the second positioning baffle is the standard force arm length of the specimen; Adjust the locking nut of the left spring chuck of the pure bending fatigue machine to clamp the left clamping end of the specimen with appropriate force, and then use the locking nut of the right spring chuck to clamp the right clamping end of the specimen with appropriate force; Slide the second positioning baffle towards the first positioning baffle to disengage the first positioning baffle and the second positioning baffle from the left spring chuck and the right spring chuck, complete the specimen clamping work for the pure bending fatigue experiment, remove this device, and then the pure bending fatigue test can be started according to the operating procedures.

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