Sample centering fixture for metal fatigue testing

Abstract

The utility model relates to metal fatigue test technical field discloses sample centering positioner of metal fatigue test, including detection stage, the top side fixedly connected with detection disc of detection stage, the inside right side fixedly connected with drive assembly of detection disc, the left end rotationally connected with two rotating plates of drive assembly, the far side rotationally connected with concave plate of two rotating plates, the top side fixedly connected with connecting plate of concave plate, the similar side fixedly connected with clamping plate of two connecting plates, the front and back both sides fixedly connected with side plate of clamping plate, the inside rotationally connected with transmission plate of side plate. In the utility model, drive metal to the middle of detection disc, and then reverse start hydraulic cylinder drives I -section plate to slide back, at this moment will drive two feeding plates to slide to the far side, and then can carry out secondary feeding quickly, and need not wait for the operation of feeding and discharging.

Description

Technical Field

[0001] This utility model relates to the field of metal fatigue testing technology, and in particular to a sample centering and positioning device for metal fatigue testing. Background Technology

[0002] Metal fatigue refers to the phenomenon that when a metallic material is subjected to cyclic or alternating stress, even if the stress is lower than the material's yield strength, cracks will still form in local weak areas after a certain number of cycles, eventually leading to fracture. The core of metal fatigue testing is to evaluate the fatigue life of the material by simulating cyclic loads under actual working conditions, ensuring load consistency, and ensuring that the test results can truly reflect the fatigue performance of the material.

[0003] The operator places the metal sample into the V-shaped positioning groove of the centering positioner, presses down on both handles with both hands to drive the wedge slider to move the elastic jaws to clamp the sample, ensuring that the coaxiality error between the sample and the loading axis is within 0.05mm. After releasing the handles to allow the jaws to lightly touch the sample, the sample is installed into the testing machine chuck. The operator then presses the handles again to tighten the jaws, completing the sample positioning and allowing the test to begin.

[0004] In existing technologies, some metal fatigue testing specimen alignment positioners require the metal to be removed and then placed back in after the metal fatigue test is completed. However, the process of placing and removing the metal requires waiting time, which reduces testing efficiency when testing large areas of metal. Therefore, to address these shortcomings, a metal fatigue testing specimen alignment positioner is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a sample centering and positioning device for metal fatigue testing, which aims to improve the problem that some existing metal fatigue testing sample centering and positioning devices require loading, waiting time, and unloading during use, resulting in reduced testing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A specimen centering and positioning device for metal fatigue testing includes a testing platform. A testing disk is fixedly connected to the top side of the testing platform. A drive assembly is fixedly connected to the right side of the inside of the testing disk. Two rotating plates are rotatably connected to the left end of the drive assembly. A concave plate is rotatably connected to the far end of each of the two rotating plates. A connecting plate is fixedly connected to the top side of each of the concave plates. A clamping plate is fixedly connected to the near side of each of the two connecting plates. Side plates are fixedly connected to the front and rear sides of each clamping plate. A transmission plate is rotatably connected to the inside of each side plate. A fixed plate is rotatably connected to the near end of each of the two transmission plates. A feeding plate is fixedly connected to the near side of each of the two fixed plates. A power assembly is fixedly connected to the top side of the testing platform.

[0008] As a further description of the above technical solution:

[0009] A cylinder is fixedly connected inside the power assembly. A connecting column is fixedly connected to the drive end of the cylinder. A detection sensor is fixedly connected inside the connecting column. A pressing plate is slidably connected to the right end of the connecting column. A connecting frame is fixedly connected to the left side of the pressing plate. A sliding plate is slidably connected to the left end of the connecting column. A fixed frame is fixedly connected to the right side of the sliding plate. Multiple springs are fixedly connected to the right side of the connecting frame and the right side of the fixed frame. Limit blocks are fixedly connected to the inside of both the connecting frame and the fixed frame. A positioning pressing column is slidably connected inside the connecting column.

[0010] As a further description of the above technical solution:

[0011] The drive assembly includes a hydraulic cylinder, the right side of which is fixedly connected to the right side of the inner wall of the detection disc, and the drive end of the hydraulic cylinder is fixedly connected to an I-shaped plate.

[0012] As a further description of the above technical solution:

[0013] The inner part of the I-shaped plate is rotatably connected to one end of the two rotating plates, and the outer parts of the two concave plates are slidably connected to the inner parts of the left and right ends of the detection disk, respectively.

[0014] As a further description of the above technical solution:

[0015] The bottom sides of the two feeding plates are slidably connected to the top side of the detection plate, and the bottom sides of the two clamping plates are slidably connected to the top side of the detection plate;

[0016] As a further description of the above technical solution:

[0017] The power assembly includes two electric push rods, the bottom sides of which are fixedly connected to the top side of the testing platform. The driving ends of the two electric push rods are fixedly connected to a top plate. Guide shafts are slidably connected to both ends of the top plate, and the bottom sides of the two guide shafts are fixedly connected to the top side of the testing platform.

[0018] As a further description of the above technical solution:

[0019] The outer side of the connecting frame is slidably connected to the inside of the connecting post, and the outer side of the fixing frame is slidably connected to the inside of the connecting post;

[0020] As a further description of the above technical solution:

[0021] The two limiting blocks are externally slidably connected to the inside of the left and right ends of the positioning pressing column, and the top side of the positioning pressing column is in contact with the bottom side of the detection sensor.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the transmission plate drives the feeding plate to slide, causing the two feeding plates to slide towards each other, and then drive the metal to the middle of the detection plate. Then, the hydraulic cylinder is activated in the opposite direction to drive the I-shaped plate to slide backward, which will drive the two feeding plates to slide towards each other. Then, the secondary feeding can be carried out quickly without the need for loading and unloading operations and waiting. The I-shaped plate drives the rotating plate to rotate, and then drives the two concave plates to slide towards each other. Then, the connecting plate drives the clamping plate to slide, so that the two clamping plates can clamp the sample and accurately center it.

[0024] 2. In this utility model, the fixed frame drives the internal fixed limiting block to slide. At this time, the two limiting blocks will slide to the opposite side until they slide away from the interior of the positioning pressing column. At this time, the positioning pressing column can be replaced and repaired. Attached Figure Description

[0025] Figure 1 This is a perspective view of the metal fatigue testing specimen alignment and positioning device proposed in this utility model.

[0026] Figure 2 This is a schematic diagram of the guide shaft of the metal fatigue testing specimen centering positioner proposed in this utility model.

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the loading plate of the metal fatigue testing specimen centering and positioning device proposed in this utility model.

[0029] Figure 5 This is a schematic diagram of the fixing plate of the metal fatigue testing specimen centering positioner proposed in this utility model.

[0030] Figure 6 This is a schematic diagram of the connecting frame of the metal fatigue testing specimen centering positioner proposed in this utility model.

[0031] Figure 7 This is a schematic diagram of the fixing frame of the specimen centering positioner for metal fatigue testing proposed in this utility model.

[0032] Legend:

[0033] 1. Inspection table; 2. Inspection disc; 3. Hydraulic cylinder; 4. I-shaped plate; 5. Rotating plate; 6. Concave plate; 7. Connecting plate; 8. Clamping plate; 9. Side plate; 10. Transmission plate; 11. Fixing plate; 12. Feeding plate; 13. Electric push rod; 14. Top plate; 15. Guide shaft; 16. Cylinder; 17. Connecting column; 18. Detection sensor; 19. Pressing plate; 20. Connecting frame; 21. Sliding plate; 22. Fixing frame; 23. Spring; 24. Limiting block; 25. Positioning pressing column. Detailed Implementation

[0034] 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.

[0035] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of a sample centering and positioning device for metal fatigue testing, comprising a testing platform 1. The testing platform 1 is made of alloy casting, possessing good rigidity and stability, and capable of withstanding various stresses and vibrations during the testing process. A testing disk 2 is fixedly connected to the top side of the testing platform 1, providing support for the metal testing. A driving assembly, including a hydraulic cylinder 3, is fixedly connected to the right side of the inside of the testing disk 2, providing a driving source. The right side of the hydraulic cylinder 3 is fixedly connected to the right side of the inner wall of the testing disk 2, ensuring stable operation of the hydraulic cylinder 3. An I-shaped plate 4 is fixedly connected to the driving end of the hydraulic cylinder 3, allowing the I-shaped plate 4 to slide by activating the hydraulic cylinder 3.

[0036] Reference Figures 2 to 4The left end of the drive assembly is rotatably connected to two rotating plates 5. An I-shaped plate 4 is rotatably connected to the adjacent ends of the two rotating plates 5, and the sliding of the I-shaped plate 4 pushes the two rotating plates 5 to rotate. Concave plates 6 are rotatably connected to the distant ends of the two rotating plates 5, and the rotating plates 5 transmit the rotational force to the concave plates 6, causing the two concave plates 6 to slide towards each other. The outer surfaces of the two concave plates 6 are slidably connected to the interiors of the left and right ends of the detection disk 2, and the detection disk 2 restricts the concave plates 6 to slide stably. A connecting plate 7 is fixedly connected to the top side of the concave plates 6, and the sliding force is transmitted from the concave plates 6 to the connecting plate 7.

[0037] Reference Figures 4 to 5 Two clamping plates 7 are fixedly connected to adjacent sides of each other, and the sliding force of the concave plate 6 is transmitted to the clamping plates 8 through the connecting plates 7. The bottom sides of the two clamping plates 8 are slidably connected to the top side of the detection disk 2, and the two clamping plates 8 can slide stably through the support of the detection disk 2. Side plates 9 are fixedly connected to the front and rear sides of the clamping plates 8, and the sliding force is transmitted to the side plates 9 through the clamping plates 8. A transmission plate 10 is rotatably connected inside the side plate 9, and the side plate 9 drives the transmission plate 10 to rotate by sliding. Fixed plates 11 are rotatably connected to adjacent ends of the two transmission plates 10, and the rotational force is transmitted to the fixed plates 11 through the transmission plates 10, causing the two fixed plates 11 to slide to opposite sides. A feeding plate 12 is fixedly connected to adjacent sides of the two fixed plates 11, and the sliding force is transmitted to the feeding plate 12 through the fixed plates 11. The bottom sides of the two feeding plates 12 are slidably connected to the top side of the detection plate 2. With the support of the detection plate 2, the two feeding plates 12 can slide stably.

[0038] Reference Figure 2 , Figure 6 and Figure 7 A power assembly is fixedly connected to the top side of the testing table 1. The power assembly includes two electric push rods 13, which provide the drive source. The bottom sides of the two electric push rods 13 are fixedly connected to the top side of the testing table 1, ensuring stable operation. A top plate 14 is fixedly connected to the drive ends of the two electric push rods 13, allowing the top plate 14 to slide up and down when the electric push rods 13 are activated. Guide shafts 15 are slidably connected to both ends of the top plate 14, providing guidance for its sliding. The bottom sides of the two guide shafts 15 are fixedly connected to the top side of the testing table 1 by welding, providing support for the guide shafts 15. A cylinder 16 is fixedly connected inside the power assembly, providing the drive source. A connecting column 17 is fixedly connected to the drive end of the cylinder 16, allowing the connecting column 17 to move up and down when the cylinder 16 is activated.

[0039] A detection sensor 18 is fixedly connected inside the connecting column 17. The detection sensor 18 is a high-precision pressure and displacement sensor, which can monitor the force and deformation of the sample during the testing process in real time. This is existing technology and will not be described in detail here. A pressing plate 19 is slidably connected to the right end of the connecting column 17. The pressing plate 19 can slide stably due to the constraint of the connecting column 17. A connecting frame 20 is fixedly connected to the left side of the pressing plate 19. The pressing plate 19 is pushed to slide, and then the connecting frame 20 slides. The connecting frame 20 is slidably connected to the outside of the connecting column 17 inside the connecting column 17. The connecting column 17 can also constrain the connecting frame 20 to slide stably. A sliding plate 21 is slidably connected to the left end of the connecting column 17. The sliding plate 21 can slide stably due to the constraint of the connecting column 17.

[0040] A fixed frame 22 is fixedly connected to the right side of the sliding plate 21. Pushing the sliding plate 21 causes it to slide, which in turn causes the fixed frame 22 to slide synchronously. The fixed frame 22 is externally slidably connected to the inside of the connecting post 17. The connecting post 17 restricts the sliding of the connecting frame 20. Multiple springs 23 are fixedly connected to the right side of the inside of the connecting frame 20 and the right side of the fixed frame 22. Sliding the connecting frame 20 and the fixed frame 22 towards each other compresses the springs 23, allowing them to store elastic potential energy and thus exert a force in the opposite direction on the connecting frame 20 and the fixed frame 22, causing them to slide. Limiting blocks 24 are fixedly connected to the inside of both the connecting frame 20 and the fixed frame 22, and are fixed by welding, providing support for the limiting blocks 24. A positioning pressing post 25 is slidably connected inside the connecting post 17, allowing the positioning pressing post 25 to slide stably for installation. The two limiting blocks 24 are externally slidably connected to the inside of the left and right ends of the positioning pressing post 25, and are engaged by the two limiting blocks 24 sliding into the inside of the positioning pressing post 25. The top side of the positioning pressing post 25 contacts the bottom side of the detection sensor 18, ensuring that the detection sensor 18 can accurately sense the pressure and displacement signals transmitted by the positioning pressing post 25. This is existing technology and will not be described in detail here.

[0041] Working principle: First, the sample to be tested is placed on the testing plate 2 and attached to the feeding plate 12. Then, the hydraulic cylinder 3 is activated to drive the I-shaped plate 4 to slide, which in turn drives the rotating plate 5 to rotate, thereby driving the concave plate 6 to slide. Through the connecting plate 7, the concave plate 6 drives the clamping plate 8 to slide, and then drives the side plate 9 to slide. Through the side plate 9, the transmission plate 10 is rotated. Through the fixed plate 11, the transmission plate 10 drives the feeding plate 12 to slide, causing the two feeding plates 12 to slide towards each other. Then, the metal is moved to the middle of the testing plate 2. Then, the hydraulic cylinder 3 is activated in the opposite direction to drive the I-shaped plate 4 to slide backward. At this time, the two feeding plates 12 will slide towards each other. Then, a second feeding can be quickly performed. The I-shaped plate 4 drives the rotating plate 5 to rotate, which in turn drives the two concave plates 6 to slide towards each other. Then, through the connecting plate 7, the clamping plate 8 is moved, so that the two clamping plates 8 can clamp the sample and accurately center it.

[0042] After centering is completed, the electric push rod 13 is activated to drive the top plate 14 to move smoothly down along the guide shaft 15, which in turn drives the connecting column 17 and the pressing plate 19 to descend synchronously. Then, the cylinder 16 is activated to further drive the connecting column 17 to move down. The detection sensor 18 inside the connecting column 17 then approaches the sample. When the positioning pressing column 25 contacts the sample surface, the positioning pressing column 25 transmits pressure to the sample. The detection sensor 18 monitors the pressure and displacement data of the sample in real time during the stress process and transmits it to the control system. At this point, the entire device officially begins to carry out metal fatigue testing until the test flow is completed.

[0043] When the positioning pressing post 25 needs to be replaced, the pressing plate 19 and the sliding plate 21 are pushed to slide towards each other. Then, the pressing plate 19 will drive the internal fixed limiting block 24 to slide through the connecting frame 20. Then, the sliding plate 21 will drive the internal fixed limiting block 24 to slide through the fixed frame 22. At this time, the two limiting blocks 24 will slide towards each other until they slide away from the interior of the positioning pressing post 25. At this time, the positioning pressing post 25 can be replaced and repaired. During the sliding process of the connecting frame 20 and the fixed frame 22, multiple springs 23 will be squeezed. At this time, multiple springs 23 will store elastic potential energy. Conversely, after the positioning pressing post 25 is engaged inside the connecting post 17, the pushing force on the pressing plate 19 and the sliding plate 21 is released. The force of the springs 23 returning is transmitted to the two limiting blocks 24 to engage inside the positioning pressing post 25 for installation.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A specimen centering and positioning device for metal fatigue testing, comprising a testing stage (1), characterized in that: The top side of the testing platform (1) is fixedly connected to a testing disk (2). The right side of the inside of the testing disk (2) is fixedly connected to a driving assembly. The left end of the driving assembly is rotatably connected to two rotating plates (5). The far ends of the two rotating plates (5) are rotatably connected to concave plates (6). The top side of the concave plates (6) is fixedly connected to a connecting plate (7). The near sides of the two connecting plates (7) are fixedly connected to clamping plates (8). The front and rear sides of the clamping plates (8) are fixedly connected to side plates (9). The inside of the side plates (9) is rotatably connected to a transmission plate (10). The near ends of the two transmission plates (10) are rotatably connected to a fixing plate (11). The near sides of the two fixing plates (11) are fixedly connected to a feeding plate (12). The top side of the testing platform (1) is fixedly connected to a power assembly.

2. The specimen centering and positioning device for metal fatigue testing according to claim 1, characterized in that: A cylinder (16) is fixedly connected inside the power assembly. A connecting column (17) is fixedly connected to the drive end of the cylinder (16). A detection sensor (18) is fixedly connected inside the connecting column (17). A pressing plate (19) is slidably connected to the right end of the connecting column (17). A connecting frame (20) is fixedly connected to the left side of the pressing plate (19). A sliding plate (21) is slidably connected to the left end of the connecting column (17). A fixing frame (22) is fixedly connected to the right side of the sliding plate (21). Multiple springs (23) are fixedly connected to the right side of the connecting frame (20) and the right side of the fixing frame (22). Limit blocks (24) are fixedly connected to the inside of both the connecting frame (20) and the fixing frame (22). A positioning pressing column (25) is slidably connected inside the connecting column (17).

3. The specimen centering and positioning device for metal fatigue testing according to claim 1, characterized in that: The drive assembly includes a hydraulic cylinder (3), the right side of which is fixedly connected to the right side of the inner wall of the detection plate (2), and the drive end of the hydraulic cylinder (3) is fixedly connected to an I-shaped plate (4).

4. The specimen centering and positioning device for metal fatigue testing according to claim 3, characterized in that: The interior of the I-shaped plate (4) is rotatably connected to one end of the two rotating plates (5), and the exterior of the two concave plates (6) is slidably connected to the interior of the left and right ends of the detection disk (2).

5. The specimen centering and positioning device for metal fatigue testing according to claim 1, characterized in that: The bottom sides of the two feeding plates (12) are slidably connected to the top side of the detection plate (2), and the bottom sides of the two clamping plates (8) are slidably connected to the top side of the detection plate (2).

6. The specimen centering and positioning device for metal fatigue testing according to claim 1, characterized in that: The power assembly includes two electric push rods (13), the bottom sides of which are fixedly connected to the top side of the testing platform (1), the driving ends of which are fixedly connected to a top plate (14), and guide shafts (15) are slidably connected to both the left and right ends of the top plate (14), the bottom sides of which are fixedly connected to the top side of the testing platform (1).

7. The specimen centering and positioning device for metal fatigue testing according to claim 2, characterized in that: The external of the connecting frame (20) is slidably connected to the inside of the connecting post (17), and the external of the fixing frame (22) is slidably connected to the inside of the connecting post (17).

8. The specimen centering and positioning device for metal fatigue testing according to claim 2, characterized in that: The two limiting blocks (24) are externally slidably connected to the inside of the left and right ends of the positioning pressing column (25), and the top side of the positioning pressing column (25) is in contact with the bottom side of the detection sensor (18).

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