Clamp for a material fatigue testing machine

Abstract

The utility model discloses a kind of fixtures of material fatigue testing machine, including rack, the upper surface of rack is equipped with multiple symmetrical distribution's support column, support column is equipped with top plate, top plate is equipped with hydraulic drive assembly, connecting rod is inserted and equipped with in hydraulic drive assembly by being equipped with positioning pin, the lower end of connecting rod is fixedly installed with pressure head, arc locating groove is set up in pressure head;The upper surface of rack is equipped with multiple positioning base, multiple positioning base is respectively equipped with driving screw and guide slide bar, two thread direction opposite's moving slider is threadedly connected on driving screw, the side of moving slider is slidably installed on guide slide bar.The fixture of the material fatigue testing machine is convenient to replace, saves time and effort, improves the convenience, reduces the possibility of test piece separation, improves the precision of test, angle can change, facilitate the performance of test, reduce the damage to adjustable clamping ring.

Description

Technical Field

[0001] This utility model relates to the field of materials testing technology, specifically a fixture for a materials fatigue testing machine. Background Technology

[0002] In materials science research and engineering applications, fatigue testing is an important means of evaluating material properties. Materials fatigue testing typically involves applying cyclic loads to specimens made of metals, non-metals, or other materials to simulate the alternating stresses that materials experience during actual use, thereby determining key performance indicators such as fatigue life and fatigue limit.

[0003] Existing fixtures for material fatigue testing machines have several shortcomings in use. For example, the pressure heads are typically fixed in a complex manner, making it cumbersome and time-consuming to change to different sizes and shapes of specimens when different specifications are needed, thus reducing testing efficiency. Regarding specimen clamping, traditional fixtures are difficult to adjust precisely according to the specimen length, leading to uneven stress on the specimen during testing and affecting the accuracy of the results. Furthermore, the clamping structure often cannot rotate flexibly during testing. When the specimen deforms at a certain angle, the fixture may exert additional constraint forces on the specimen, not only affecting the normal conduct of the test but also potentially damaging the fixture itself. Utility Model Content

[0004] The purpose of this utility model is to provide a fixture for a material fatigue testing machine, which facilitates the replacement of the pressure head according to the specifications of the test specimen, saving time and effort, improving the convenience of pressure head replacement, reducing the possibility of specimen detachment, improving the accuracy of the test, and allowing the angle to be changed to facilitate the test. At the same time, it reduces damage to the adjustable clamping ring and improves the precision of the experimental operation, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fixture for a material fatigue testing machine includes a frame. Multiple symmetrically distributed support columns are mounted on the upper surface of the frame. A top plate is mounted on the support columns, and a hydraulic drive assembly is mounted on the top plate. A connecting rod is inserted into the hydraulic drive assembly via a positioning pin. A pressure head is fixedly mounted at the lower end of the connecting rod, and the pressure head has an arc-shaped positioning groove. Multiple positioning bases are mounted on the upper surface of the frame. A drive screw and a guide slide rod are respectively mounted on each positioning base. Two movable sliders with opposite thread directions are threaded onto the drive screw. One side of each movable slider is slidably mounted on the guide slide rod. An adjustable clamping ring is hinged to each movable slider. A fastening screw is threaded onto the adjustable clamping ring, and a positioning pressure block is rotatably mounted at the lower end of the fastening screw via a bearing. The positioning pressure block is located within the adjustable clamping ring.

[0007] Preferably, the hydraulic drive assembly includes two servo hydraulic cylinders and a strip connecting plate. The two servo hydraulic cylinders are respectively fixedly mounted on the top plate, and their output ends are fixedly connected to the strip connecting plate. The connecting rod is inserted into the strip connecting plate, and the positioning pin is inserted into the connecting rod and the strip connecting plate.

[0008] Preferably, a threaded connecting sleeve is fixedly installed on the upper surface of the frame, the lower end of the support column is threadedly connected to the threaded connecting sleeve, a positioning and limiting ring is fixedly installed on the upper part of the support column, and the lower surface of the top plate abuts against the surface of the positioning and limiting ring.

[0009] Preferably, both the inner circumferential surface of the adjustable clamping ring and the surface of the positioning block are provided with V-shaped anti-slip grooves.

[0010] Preferably, a servo drive motor is installed inside the frame, and transmission gears are respectively installed at the output end of the servo drive motor and the input end of the drive screw, with a transmission chain meshing on the two transmission gears.

[0011] Preferably, a mounting rod is fixedly installed on one side of the frame, and a parameter display device is hinged to the mounting rod.

[0012] Preferably, a rectangular test slot is provided below the pressure head, and the rectangular test slot is formed on the surface of the frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In the fixture of this material fatigue testing machine, the top plate installed on the support column facilitates the installation of the hydraulic drive assembly. The pressure head is inserted into the hydraulic drive assembly through the connecting rod and the positioning pin. Pulling out the positioning pin allows the pressure head and the connecting rod to be quickly removed from the hydraulic drive assembly, which facilitates the replacement of the pressure head according to the specifications of the test specimen, saving time and effort and improving the convenience of pressure head replacement. The arc-shaped positioning groove set on the pressure head can reduce the possibility of the specimen detaching from the pressure head.

[0015] 2. In the fixture of this material fatigue testing machine, rotating the drive screw causes two movable sliders to move in opposite directions on the guide slide rod. This allows for easy adjustment of the distance between the two adjustable clamping rings according to the length of the specimen, enabling limiting clamping at both ends of the specimen and aligning the center point of the specimen with the pressure head, thus improving the accuracy of the test. The adjustable clamping rings are hinged to the movable sliders and can rotate. Adjusting the downward position of the positioning pressure block by tightening the screws facilitates clamping and fixing the specimen within the adjustable clamping rings. When the specimen deforms during the test, the two adjustable clamping rings rotate accordingly, changing their angle, which facilitates the test and reduces damage to the adjustable clamping rings, thereby improving the accuracy of the experimental operation. Attached Figure Description

[0016] Figure 1 Schematic diagram of the fixture for the material fatigue testing machine provided by this utility model Figure 1 ;

[0017] Figure 2 Schematic diagram of the fixture for the material fatigue testing machine provided by this utility model Figure 2 ;

[0018] Figure 3 Schematic diagram of the fixture for the material fatigue testing machine provided by this utility model Figure 3 ;

[0019] Figure 4 A schematic diagram showing the connection of the strip connecting plate, connecting rod and pressure head of the fixture of the material fatigue testing machine provided by this utility model;

[0020] Figure 5 A schematic diagram showing the connection of the movable slider, adjustable clamping ring, and positioning pressure block of the fixture of the material fatigue testing machine provided by this utility model.

[0021] In the diagram: 1. Frame; 2. Support column; 3. Top plate; 4. Hydraulic drive assembly; 401. Servo hydraulic cylinder; 402. Strip connecting plate; 5. Positioning pin; 6. Connecting rod; 7. Pressure head; 8. Arc-shaped positioning groove; 9. Positioning base; 10. Drive screw; 11. Guide slide rod; 12. Moving slider; 13. Adjustable clamping ring; 14. Fastening screw; 15. Positioning pressure block; 16. Threaded connecting sleeve; 17. Positioning limit ring; 18. V-shaped anti-slip groove; 19. Servo drive motor; 20. Transmission gear; 21. Transmission chain; 22. Mounting support rod; 23. Parameter display device; 24. Rectangular test slot. 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] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-5 This utility model provides a fixture for a material fatigue testing machine, including a frame 1. Multiple symmetrically distributed support columns 2 are mounted on the upper surface of the frame 1. A top plate 3 is mounted on the multiple support columns 2. A hydraulic drive assembly 4 is mounted on the top plate 3. A connecting rod 6 is inserted into the hydraulic drive assembly 4 via a positioning pin 5. A pressure head 7 is fixedly mounted at the lower end of the connecting rod 6. An arc-shaped positioning groove 8 is formed on the pressure head 7. Multiple positioning bases 9 are mounted on the upper surface of the frame 1. A drive screw 10 and a guide slide rod 11 are respectively mounted on the multiple positioning bases 9. Two movable sliders 12 with opposite thread directions are threadedly connected to the drive screw 10. One side of the movable slider 12 is slidably mounted on the guide slide rod 11. An adjustable clamping ring 13 is hinged to the movable slider 12. A fastening screw 14 is threadedly connected to the adjustable clamping ring 13. A positioning pressure block 15 is rotatably mounted at the lower end of the fastening screw 14 via a bearing. The positioning pressure block 15 is located inside the adjustable clamping ring 13.

[0025] In the fixture of this material fatigue testing machine, the top plate 3 mounted on the support column 2 facilitates the installation of the hydraulic drive assembly 4. The pressure head 7 is inserted into the hydraulic drive assembly 4 via the connecting rod 6 and the positioning pin 5. Pulling out the positioning pin 5 allows the pressure head 7, along with the connecting rod 6, to be quickly removed from the hydraulic drive assembly 4, facilitating the replacement of the pressure head 7 according to the specifications of the test specimen. This saves time and effort and improves the ease of replacing the pressure head 7. The arc-shaped positioning groove 8 on the pressure head 7 reduces the possibility of the specimen detaching from the pressure head 7. When the drive screw 10 is rotated, it drives the two moving sliders 12 to move relative to or opposite directions on the guide slide rod 11. The adjustable clamping rings 13 are designed to allow for easy adjustment of the distance between them according to the length of the specimen. This allows for limiting and clamping both ends of the specimen, aligning the center point of the specimen with the pressure head and improving the accuracy of the test. The adjustable clamping rings 13 are hinged to the movable slider 12 and can rotate. When the position of the positioning block 15 is adjusted downward by the fastening screw 14, it is convenient to clamp and fix the specimen within the adjustable clamping rings 13. When the specimen deforms during the test, the two adjustable clamping rings 13 rotate accordingly, and the angle changes, facilitating the test and reducing damage to the adjustable clamping rings 13, thus improving the accuracy of the experimental operation.

[0026] The aforementioned hydraulic drive assembly 4 includes two servo hydraulic cylinders 401 and a strip connecting plate 402. The two servo hydraulic cylinders 401 are respectively fixedly installed on the top plate 3, and their output ends are fixedly connected to the strip connecting plate 402. The connecting rod 6 is inserted into the strip connecting plate 402, and the positioning pin 5 is inserted into the connecting rod 6 and the strip connecting plate 402. The two servo hydraulic cylinders 401 simultaneously drive the strip connecting plate 402 to move downward, which greatly increases the downward pressure of the pressure head 7 on the connecting rod 6, increases the test range for specimens of different materials, and facilitates the installation of the connecting rod 6 through the strip connecting plate 402, improving the ease of insertion of the pressure head 7.

[0027] A threaded connecting sleeve 16 is fixedly installed on the upper surface of the frame 1. The lower end of the support column 2 is threadedly connected to the threaded connecting sleeve 16. A positioning and limiting ring 17 is fixedly installed on the upper part of the support column 2. The lower surface of the top plate 3 abuts against the surface of the positioning and limiting ring 17. The threaded connecting sleeve 16 greatly improves the ease of installation of the support column 2, and the positioning and limiting ring 17 improves the stability of the top plate 3. A servo drive motor 19 is installed inside the frame 1. The output end of the servo drive motor 19 and the input end of the drive screw 10 are respectively installed... There is a transmission gear 20, and a transmission chain 21 meshes with the two transmission gears 20. The servo drive motor 19 can easily drive the drive screw 10 to rotate, which can easily drive the two movable sliders 12 to move on the guide slide rod 11, and can easily adjust the clamping distance according to the length of the specimen. A mounting support rod 22 is fixedly installed on one side of the frame 1. A parameter display device 23 is hinged to the mounting support rod 22. The parameter display device 23 fixedly installed on the mounting support rod 22 can easily display parameters such as loading force, number of cycles, and specimen deformation, so as to intuitively understand the test data.

[0028] The inner circumferential surface of the adjustable clamping ring 13 and the surface of the positioning pressure block 15 are both provided with V-shaped anti-slip grooves 18. The V-shaped anti-slip grooves 18 can improve the friction between the adjustable clamping ring 13 and the positioning pressure block 15, thereby improving the stability and firmness of the specimen clamping. A rectangular test slot 24 is provided below the pressure head 7. The rectangular test slot 24 is opened on the surface of the frame 1. The rectangular test slot 24 can improve the range of specimen deformation angle during testing.

[0029] When using the fixture of the material fatigue testing machine, select the appropriate specification of the pressure head 7 and its matching connecting rod 6, reinstall them on the strip connecting plate 402, and insert the positioning pin 5 for fixation. Start the servo drive motor 19, which drives the drive screw 10 to rotate through the transmission gear 20 and the transmission chain 21. When the drive screw 10 rotates, it will drive the two moving sliders 12 to move in opposite or opposite directions on the guide slide rod 11 until the distance between the two adjustable clamping rings 13 is adapted to the length of the specimen. The two ends of the specimen are placed in two adjustable clamping rings 13 respectively. The adjustable clamping rings 13 are hinged to the movable slider 12 and can rotate. The fastening screw 14 on the adjustable clamping ring 13 is rotated. The lower end of the fastening screw 14 is rotatably mounted with a positioning pressure block 15 through a bearing. As the fastening screw 14 rotates, the positioning pressure block 15 moves downward. At the same time, V-shaped anti-slip grooves 18 are provided on the inner circumferential surface of the adjustable clamping ring 13 and the surface of the positioning pressure block 15. The V-shaped anti-slip grooves 18 increase the friction force, thereby firmly clamping the specimen in the adjustable clamping ring 13 and ensuring that the specimen will not move easily during the test.

[0030] After the specimen is clamped, two servo hydraulic cylinders 401 are activated. Simultaneously, the two servo hydraulic cylinders 401 drive the strip connecting plate 402 downwards, thereby applying downward pressure to the pressure head 7 at the lower end of the connecting rod 6. The pressure head 7 has an arc-shaped positioning groove 8, which reduces the possibility of the specimen detaching from the pressure head 7. The specimen undergoes fatigue testing under the pressure of the pressure head 7. A rectangular test slot 24 is provided below the pressure head 7, which is located on the surface of the frame 1, increasing the range of specimen deformation angles. During the test, a mounting support rod 22 is fixedly installed on one side of the frame 1. A parameter display device 23 is hinged to the mounting support rod 22. The parameter display device 23 displays parameters such as loading force, number of cycles, and specimen deformation in real time, allowing test personnel to intuitively understand the test data.

[0031] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixture for a material fatigue testing machine, comprising a frame (1), characterized in that: Multiple symmetrically distributed support columns (2) are installed on the upper surface of the frame (1). A top plate (3) is installed on the multiple support columns (2). A hydraulic drive assembly (4) is installed on the top plate (3). A connecting rod (6) is inserted into the hydraulic drive assembly (4) through a positioning pin (5). A pressure head (7) is fixedly installed at the lower end of the connecting rod (6). An arc-shaped positioning groove (8) is opened on the pressure head (7). Multiple positioning bases (9) are installed on the upper surface of the frame (1). Each of the multiple positioning bases (9) has a corresponding positioning groove. A drive screw (10) and a guide slide rod (11) are installed. The drive screw (10) is threaded with two movable sliders (12) with opposite thread directions. One side of the movable slider (12) is slidably mounted on the guide slide rod (11). An adjustable clamping ring (13) is hinged on the movable slider (12). A fastening screw (14) is threaded on the adjustable clamping ring (13). A positioning block (15) is rotatably mounted on the lower end of the fastening screw (14) through a bearing. The positioning block (15) is located inside the adjustable clamping ring (13).

2. The fixture for a material fatigue testing machine according to claim 1, characterized in that: The hydraulic drive assembly (4) includes two servo hydraulic cylinders (401) and a strip connecting plate (402). The two servo hydraulic cylinders (401) are respectively fixedly installed on the top plate (3), and their output ends are fixedly connected to the strip connecting plate (402). The connecting rod (6) is inserted into the strip connecting plate (402), and the positioning pin (5) is inserted into the connecting rod (6) and the strip connecting plate (402).

3. The fixture for a material fatigue testing machine according to claim 1, characterized in that: A threaded connecting sleeve (16) is fixedly installed on the upper surface of the frame (1), the lower end of the support column (2) is threadedly connected to the threaded connecting sleeve (16), a positioning limiting ring (17) is fixedly installed on the upper part of the support column (2), and the lower surface of the top plate (3) abuts against the surface of the positioning limiting ring (17).

4. The fixture for a material fatigue testing machine according to claim 1, characterized in that: The inner circumferential surface of the adjustable clamping ring (13) and the surface of the positioning block (15) are both provided with V-shaped anti-slip grooves (18).

5. The fixture for a material fatigue testing machine according to claim 1, characterized in that: A servo drive motor (19) is installed inside the frame (1). The output end of the servo drive motor (19) and the input end of the drive screw (10) are respectively equipped with transmission gears (20), and a transmission chain (21) is meshed on the two transmission gears (20).

6. The fixture for a material fatigue testing machine according to claim 1, characterized in that: A mounting rod (22) is fixedly installed on one side of the frame (1), and a parameter display device (23) is hinged on the mounting rod (22).

7. The fixture for a material fatigue testing machine according to claim 1, characterized in that: A rectangular test slot (24) is provided below the pressure head (7), and the rectangular test slot (24) is opened on the surface of the frame (1).

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