A sample butt joint device of a tensile testing machine

Abstract

The utility model relates to the technical field of tension test equipment field, disclose a kind of sample butt joint device of tensile testing machine, including support platform, and the support platform outer wall one side has sample butt joint component;The sample butt joint component includes fixed shell, and the fixed shell inner wall one side is provided with limit hole, and the limit hole inner wall one side is slidably connected with fixed shaft one, and the fixed shaft one outer wall one side is rotatably connected with gear, and the gear is meshed with rack two, and the rack two outer wall one side is fixedly connected with jaw, and the rack two outer wall one side is slidably connected with fixed shell, and the gear is meshed with rack one. In the utility model, the rotary motion of handle is converted into the linear motion of two sides rack two by gear and rack, and jaw is clamped or released sample under the guidance of the recess of fixed shell and movable mouth, and jaw can be adjusted according to the size of sample, and the clamping of different objects is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of tensile testing equipment, and in particular to a sample docking device for a tensile testing machine. Background Technology

[0002] In the field of materials mechanical property testing, tensile testing machines are core equipment for obtaining key parameters such as tensile strength, yield strength, and elongation of metals, non-metals, and composite materials. The ability to quickly, accurately, and stably clamp the specimen between the upper and lower jaws of the testing machine directly determines testing efficiency, data repeatability, and operational safety. With the increasing demand for high-capacity laboratories and online testing, traditional manual bolt rotation or single-sided lever clamping methods are no longer sufficient to meet the needs of efficient switching of large batches and multiple specifications of specimens. In existing technologies, specimen clamping devices generally employ a single-sided lead screw and nut or an eccentric cam mechanism. During operation, manually rotating the handwheel drives the lead screw, causing the nut to move axially and push the movable jaws towards the fixed jaws, thereby clamping the specimen; alternatively, by turning the eccentric handle, the cam profile and the roller contact surface are radially displaced, using the cam lift to press the jaws. Maintaining the clamping force usually relies on thread self-locking or cam self-locking angle; releasing it involves rotating the handwheel or handle in the opposite direction. To accommodate specimens of different thicknesses, some designs add wedges or shims to the back of the jaws, allowing adjustment by changing the initial jaw spacing. However, the aforementioned single-sided drive structure has revealed obvious synchronization problems in practical applications: when the specimens are of different sizes or have uneven thicknesses, the advancement of the single-sided screw or cam will cause the moving jaws to generate a skew torque, resulting in the deviation of the specimen centerline from the loading axis of the testing machine; this deviation will introduce additional bending moment in the early stage of tension, causing stress concentration and premature fracture, resulting in problems affecting the accuracy of key indicators. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a specimen docking device for a tensile testing machine, which aims to improve the problem that the clamps cannot adapt to specimens of different sizes due to different specimen sizes, resulting in the deviation of the specimen centerline during the tensile process.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a specimen docking device for a tensile testing machine, comprising a support platform, wherein a specimen docking assembly is provided on one side of the outer wall of the support platform;

[0005] The sample docking assembly includes a fixed shell, a limiting hole on one side of the inner wall of the fixed shell, a fixed shaft slidably connected to one side of the inner wall of the limiting hole, a gear rotatably connected to one side of the outer wall of the fixed shaft, a rack 2 meshing with the gear, a jaw fixedly connected to one side of the outer wall of the rack 2, a fixed shell slidably connected to one side of the outer wall of the rack 2, a rack 1 meshing with the gear, a limiting block fixedly connected to one side of the outer wall of the rack 1, a threaded post threadedly connected to one side of the inner wall of the rack 1, a rotating disk fixedly connected to one end of the threaded post, a handle fixedly connected to one side of the outer wall of the rotating disk, and movable openings on both sides of the outer wall of the fixed shell, the movable openings being slidably connected to the rack 2.

[0006] Furthermore, a support plate is fixedly connected to the upper surface of the outer wall of the support platform. A rotating shaft is rotatably connected to one side of the outer wall of the support plate. A baffle is rotatably connected to one side of the outer wall of the rotating shaft. A fixing plate is fixedly connected to one side of the outer wall of the baffle. A fixing shaft is rotatably connected to one side of the inner wall of the fixing plate. A fixing plate is rotatably connected to one side of the outer wall of the fixing shaft. A baffle is fixedly connected to one side of the outer wall of the fixing plate. A fixing shaft is rotatably connected to one side of the inner wall of the baffle. A fixing rod is rotatably connected to one end of the fixing shaft. A fixing shaft is rotatably connected to one end of the fixing rod. A telescopic rod is fixedly connected to one end of the fixing shaft.

[0007] Furthermore, the upper surface of the outer wall of the fixed shell is fixedly connected to the lower surface of the lifting plate, and both ends of the lifting plate are slidably connected to the support plate.

[0008] Furthermore, a fixed shaft five is rotatably connected to one side of the outer wall of the support plate, and the fixed shaft five is fixedly connected to the telescopic rod on one side of its outer wall.

[0009] Furthermore, the inner wall of the fixing shell is provided with a groove, and the jaws fit into the groove.

[0010] Furthermore, there are two racks, both of which are attached to the lower surface of one side of the inner wall of the fixed shell.

[0011] Furthermore, there are two gears, both of which mesh with both sides of the outer wall of the rack.

[0012] Furthermore, the support plate has holes inside, which fit against one side of the outer wall of the rotating shaft.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, the rotational motion of the handle is converted into the linear motion of the two racks on both sides by gears and racks. The jaws clamp or release the sample under the guidance of the groove of the fixed shell and the movable opening. The jaws can be adjusted according to the different sizes of the sample to achieve clamping of different objects.

[0015] 2. In this utility model, the support plate, rotating shaft, baffle one, baffle two and telescopic rod form a four-bar linkage follower mechanism. The extension and retraction of the telescopic rod can drive baffle one and baffle two to swing. This mechanism has no additional power source, is easy to disassemble and assemble, and can effectively counteract the splashes generated by the fracture of the sample during the tensile process. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a specimen docking device for a tensile testing machine proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the support plate portion of the specimen docking device of a tensile testing machine proposed in this utility model;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a schematic diagram of a portion of the baffle structure of a sample docking device for a tensile testing machine according to the present invention.

[0020] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0021] Legend:

[0022] 1. Support platform; 2. Support plate; 3. Lifting plate; 4. Handle; 5. Threaded column; 6. Rack 1; 7. Gear; 8. Fixed shaft 1; 9. Rack 2; 10. Jaw; 11. Fixed shell; 12. Limiting block; 13. Telescopic rod; 14. Fixed rod; 15. Fixed shaft 2; 16. Fixed shaft 3; 17. Fixed shaft 4; 18. Fixed plate 1; 19. Fixed shaft 5; 20. Rotating shaft; 21. Limiting hole; 22. Movable opening; 23. Baffle 1; 24. Baffle 2; 25. Fixed plate 2; 26. Rotating disc. Detailed Implementation

[0023] 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.

[0024] Reference Figures 1-5This utility model provides an embodiment of a sample docking device for a tensile testing machine, including a support platform 1. The support platform 1 provides a stable foundation for the entire system, reducing test vibration and improving docking accuracy. A sample docking assembly is located on one side of the outer wall of the support platform 1. The sample docking assembly includes a fixed shell 11. A groove is provided on the inner wall of the fixed shell 11, and jaws 10 fit into the groove. The groove guides the jaws 10, resulting in higher linearity of movement and consistent sample clamping positions. The upper surface of the outer wall of the fixed shell 11 is fixedly connected to the lower surface of a lifting plate 3. The two ends of the lifting plate 3 are slidably connected to the support plate 2, reducing cumulative errors and improving lifting synchronization. A limiting hole 21 is provided on one side of the inner wall of the fixed shell 11, providing a precise reference for a fixed shaft 8, preventing gear 7 from shifting and ensuring meshing accuracy. The fixed shaft 8 is slidably connected to one side of the inner wall of the limiting hole 21, and gears 7 are rotatably connected to one side of the outer wall of the fixed shaft 8. Two gears 7 are provided. All gears are meshed with the outer walls of rack 6 on both sides, providing symmetrical drive on both sides. Rack 6 is balanced by force, and its movement is smooth and without deviation. Gear 7 meshes with rack 9. There are two racks 9 in total, each of which is attached to the lower surface of one side of the inner wall of the fixed shell 11. The lower surface is attached to form a sliding guide rail, eliminating the need for additional guide rail parts and making the structure more compact. A jaw 10 is fixedly connected to one side of the outer wall of rack 9, and the fixed shell 11 is slidably connected to one side of the outer wall of rack 9. Gear 7 meshes with rack 6. A limit block 12 is fixedly connected to one side of the outer wall of rack 6. A threaded post 5 is threadedly connected to one side of the inner wall of rack 6. The threaded pair has a self-locking characteristic, and no continuous force is required after clamping, saving labor. A rotating disk 26 is fixedly connected to one end of the threaded post 5. A handle 4 is fixedly connected to one side of the outer wall of rotating disk 26, making rotation easier. Movable openings 22 are provided on both sides of the outer wall of the fixed shell 11, and the movable openings 22 are slidably connected to rack 9.

[0025] Reference Figures 1-5A support plate 2 is fixedly connected to the upper surface of the outer wall of the support platform 1. This integral connection eliminates swaying, forming a stable gantry frame and improving the overall torsional resistance. The support plate 2 has internal holes that fit snugly against one side of the outer wall of the rotating shaft 20. A fixed shaft 19 is rotatably connected to one side of the outer wall of the support plate 2. The fixed shaft 19 is fixedly connected to the telescopic rod 13 on one side of its outer wall. The rotating shaft 20 is rotatably connected to one side of the outer wall of the support plate 2. The rotating shaft 20 is independently installed and can be quickly disassembled and replaced. A baffle 23 is rotatably connected to one side of the outer wall of the rotating shaft 20. A fixed baffle 23 is fixedly connected to one side of its outer wall. Fixed plate 18 and baffle 123 are integrated with fixed plate 18, ensuring uniform force distribution. Fixed shaft 4 17 is rotatably connected to one side of the inner wall of fixed plate 18. Fixed plate 25 is rotatably connected to one side of the outer wall of fixed shaft 4 17. Baffle 24 is fixedly connected to one side of the outer wall of fixed plate 25. Fixed shaft 25 is rotatably connected to one side of the inner wall of baffle 24. Rotary connection reduces wear and allows baffle 24 to swing more flexibly. Fixed rod 14 is rotatably connected to one end of fixed shaft 2 15. Fixed shaft 3 16 is rotatably connected to one end of fixed rod 14. Telescopic rod 13 is fixedly connected to one end of fixed shaft 3 16.

[0026] Working principle: During tensile testing, the support platform 1 is fixedly connected to the support plate 2, and the lifting plate 3 is fixedly connected to the support plate 2, making the tensile test more stable. Rotating the handle 4 drives the rotating disk 26, which is fixedly connected to the threaded post 5. The threaded post 5 is threadedly connected to the rack 6, causing the threaded post 5 to rotate within the rack 6, thus moving the rack 6 downwards. The rack 6 only moves up and down under the constraint of the limiting block 12. The inner wall of the fixed shell 11 is provided with a limiting hole 21, allowing the limiting block 12 to slide within the limiting hole 21. Next, when rack 6 moves downward, it meshes with gear 7, causing gear 7 to rotate on fixed shaft 8, which in turn drives rack 9. Rack 9 can achieve a greater displacement through movable opening 22. Rack 9 is fixedly connected to jaw 10, causing jaw 10 to move to both sides and open. At this time, the sample is placed in jaw 10, and handle 4 is rotated in the opposite direction, causing rack 6 to move upward, driving gear 7 to rotate in the opposite direction, and then driving rack 9 to move in the opposite direction, so that jaw 10 clamps the sample.

[0027] Furthermore, after the sample is clamped, the first baffle 23 and the second baffle 24 can be unfolded by the telescopic rod 13. Under the action of the rotating shaft 20, the first baffle 23 and the second baffle 24 together with the support plate 2 form a sealed space to prevent the sample from breaking and splashing out. Pushing the first baffle 23 downwards allows it to rotate under the action of the rotating shaft 20. The fixed shaft 5 19 drives the telescopic rod 13, thereby causing the fixed rod 14 to rotate under the action of the fixed shaft 3 16. At this time, the second baffle 24 is pulled under the action of the fixed shaft 2 15. The first fixed plate 18 and the second fixed plate 25 can be unfolded by rotating on the fixed shaft 4 17. The first fixed plate 18 and the second fixed plate 25 are fixedly connected to the first baffle 23 and the second baffle 24, which can then drive the first baffle 23 and the second baffle 24.

[0028] 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 docking device for a tensile testing machine, comprising a support platform (1), characterized in that: The support platform (1) has a sample docking assembly on one side of its outer wall; The sample docking assembly includes a fixed shell (11), a limiting hole (21) is provided on one side of the inner wall of the fixed shell (11), a fixed shaft (8) is slidably connected to one side of the inner wall of the limiting hole (21), a gear (7) is rotatably connected to one side of the outer wall of the fixed shaft (8), a rack (9) is meshed with the gear (7), a jaw (10) is fixedly connected to one side of the outer wall of the rack (9), the fixed shell (11) is slidably connected to one side of the outer wall of the rack (9), a rack (6) is meshed with the gear (7), a limiting block (12) is fixedly connected to one side of the outer wall of the rack (6), a threaded column (5) is threadedly connected to one side of the inner wall of the rack (6), a rotating disk (26) is fixedly connected to one end of the threaded column (5), a handle (4) is fixedly connected to one side of the outer wall of the rotating disk (26), and movable openings (22) are provided on both sides of the outer wall of the fixed shell (11), and the movable openings (22) are slidably connected to the rack (9).

2. The specimen docking device for a tensile testing machine according to claim 1, characterized in that: A support plate (2) is fixedly connected to the upper surface of the outer wall of the support platform (1). A rotating shaft (20) is rotatably connected to one side of the outer wall of the support plate (2). A baffle (23) is rotatably connected to one side of the outer wall of the rotating shaft (20). A fixing plate (18) is fixedly connected to one side of the outer wall of the baffle (23). A fixing shaft (17) is rotatably connected to one side of the inner wall of the fixing plate (18). A fixing plate (25) is rotatably connected to one side of the outer wall of the fixing shaft (17). A baffle (24) is fixedly connected to one side of the outer wall of the fixing plate (25). A fixing shaft (15) is rotatably connected to one side of the inner wall of the baffle (24). A fixing rod (14) is rotatably connected to one end of the fixing shaft (15). A fixing shaft (16) is rotatably connected to one end of the fixing rod (14). A telescopic rod (13) is fixedly connected to one end of the fixing shaft (16).

3. The specimen docking device for a tensile testing machine according to claim 1, characterized in that: The upper surface of the outer wall of the fixed shell (11) is fixedly connected to the lower surface of the lifting plate (3), and the two ends of the lifting plate (3) are slidably connected to the support plate (2).

4. The specimen docking device for a tensile testing machine according to claim 2, characterized in that: The outer wall of the support plate (2) is rotatably connected to a fixed shaft five (19), and the outer wall of the fixed shaft five (19) is fixedly connected to the telescopic rod (13).

5. The specimen docking device for a tensile testing machine according to claim 1, characterized in that: The inner wall of the fixed shell (11) is provided with a groove, and the jaws (10) fit into the groove.

6. The specimen docking device for a tensile testing machine according to claim 5, characterized in that: There are two racks (9), both of which are attached to the lower surface of one side of the inner wall of the fixed shell (11).

7. The specimen docking device for a tensile testing machine according to claim 1, characterized in that: There are two gears (7), both of which mesh with the outer walls of the rack (6).

8. The specimen docking device for a tensile testing machine according to claim 2, characterized in that: The support plate (2) has holes inside, which are in contact with one side of the outer wall of the rotating shaft (20).

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