A clamping device for tensile test
By designing a clamping device suitable for cylinders, the deformation problem caused by existing tensile machine clamps was solved, achieving stable clamping and data accuracy, and making it suitable for tensile tests.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU HUABIAO TESTING RES INST CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-06-26
AI Technical Summary
Existing tensile testing machine fixtures are prone to deformation when clamping cylindrical experimental objects, leading to inaccurate experimental data.
A clamping device is designed, comprising a chuck housing, a chuck, and an adjusting rod. The chuck housing is a frustum structure, and the chuck consists of a base and a clamping block. Through the cooperation of the adjusting rod and the rotating block, a stable clamping of the cylinder is achieved. The chuck is prevented from tilting by a sliding groove and a slider structure, and anti-slip texture is set to improve stability. The notch facilitates material loading.
It achieves stable clamping of cylinders, improves the accuracy of experimental data and feeding efficiency, and has wider applicability.
Smart Images
Figure CN224416565U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tensile testing equipment, specifically to a clamping device for tensile testing. Background Technology
[0002] Tensile testing is one of the most basic and commonly used experimental methods for testing the mechanical properties of materials. It involves applying an axial tensile force to a standard specimen, causing the specimen to deform until it fractures, thereby determining a series of mechanical properties of the material under tensile load, such as elastic modulus, yield strength, tensile strength, elongation, and reduction of area.
[0003] Tensile testing machines are essential equipment for tensile experiments. A tensile testing machine consists of a hydraulic cylinder, a sensor, a lifting platform, and a clamping fixture. The clamping fixture is used to hold the materials being tested; it needs high stability to obtain accurate data. Patent number CN116380633A describes a high- and low-temperature loading tensile fixture for a tensile testing machine. In actual use, some experimental objects have cylindrical structures. Using the above-mentioned fixtures can cause deformation of the experimental objects, leading to inaccurate experimental data. Therefore, a clamping device is needed to replace the existing fixtures to solve this problem. Utility Model Content
[0004] This utility model aims to solve the technical problems mentioned in the background section above, and proposes the following technical solutions:
[0005] A clamping device for tensile testing includes a clamp housing, a clamp, and an adjusting rod. The front end of the clamp housing is a frustum structure with a smaller front and a larger rear. A feeding hole is provided at the front end of the clamp housing. The clamp is located inside the clamp housing and consists of a base and several clamping blocks. The clamping blocks are arranged in a ring array on one side of the base. The clamping blocks have a trapezoidal cross-section. The other side of the base is rotatably connected to the adjusting rod. A threaded hole is provided in the middle of the rear end of the clamp housing. One end of the adjusting rod passes through the threaded hole and is located outside the clamp housing. The outer circumference of the adjusting rod is threadedly connected to the threaded hole. A rotating block is fixedly sleeved on the side of the adjusting rod located outside the clamp housing.
[0006] Preferably, a rotating rod is provided on the outer periphery of the rotating block, and a rotating rod connecting hole is provided on the outer periphery of the rotating block, wherein the rotating rod is threadedly connected to the rotating rod connecting hole.
[0007] Preferably, a groove is provided on the inner wall of the chuck housing, and a slider is provided on the side of the base, the slider being slidably connected to the groove.
[0008] Preferably, the side of the clamping block is provided with anti-slip texture.
[0009] Preferably, a notch is provided on one side of the top of the clamping block.
[0010] The beneficial effects of this utility model are:
[0011] 1. This utility model installs the chuck inside the chuck housing, and uses the chuck housing to limit the distance between the clamping blocks on the chuck. The position between the chuck and the chuck housing can be adjusted by rotating the adjusting rod, thereby controlling the distance between the clamping blocks. Furthermore, multiple clamping blocks are provided to clamp a cylindrical structure.
[0012] 2. By setting a rotating rod, the rotation of the rotating block can be controlled, which is more convenient and labor-saving.
[0013] 3. By setting a sliding groove on the inner wall of the chuck housing and a slider on the side of the base, the sliding connection between the slider and the sliding groove can ensure that the chuck will not tilt when the adjustment rod is adjusted.
[0014] 4. By setting anti-slip textures on the side of the clamping block, the stability of the chuck shell and the chuck can be improved. A notch is set on the top of the clamping block, which allows for quick loading. Attached Figure Description
[0015] Figure 1 This is a cross-sectional view of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the clamp structure of this utility model;
[0017] Figure 3 This is a cross-sectional view of the structure of this utility model in Embodiment 2;
[0018] Figure 4 This is a cross-sectional view of the structure of this utility model in Embodiment 3;
[0019] Figure 5 This is a schematic diagram of the clamp structure in Example 4;
[0020] Figure 6 This is a schematic diagram of the clamp structure in Example 5.
[0021] In the diagram: 1. Chuck housing; 1-1. Loading hole; 1-2. Threaded hole; 1-3. Slide groove; 2. Chuck; 2-1. Base; 2-2. Clamping block; 2-3. Anti-slip texture; 2-4. Notch; 3. Adjusting rod; 4. Rotating block; 4-1. Rotating rod connecting hole; 5. Rotating rod; 6. Slider. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0023] In the description of this utility model, it should be understood that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The connection methods described by the terms "fixed connection" and "fixed setting" include, but are not limited to, "welding," "riveting," "adhesion," and "threaded connection." The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.
[0024] The terms “upper,” “lower,” “front,” “back,” “left,” “right,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] Example 1
[0026] Reference Figure 1-2 A clamping device for tensile testing includes a clamp housing 1, a clamp 2, and an adjusting rod 3. The front end of the clamp housing 1 is a frustum structure with a smaller front and a larger rear. A feeding hole 1-1 is provided at the front end of the clamp housing 1. The clamp 2 is located inside the clamp housing 1 and consists of a base 2-1 and several clamping blocks 2-2. The clamping blocks 2-2 are arranged in a ring array on one side of the base 2-1. The clamping blocks 2-2 have a trapezoidal cross-section. The other side of the base 2-1 is rotatably connected to the adjusting rod 3. A threaded hole 1-2 is provided in the middle of the rear end of the clamp housing 1. One end of the adjusting rod 3 passes through the threaded hole 1-2 and is located outside the clamp housing 1. The outer circumference of the adjusting rod 3 is threadedly connected to the threaded hole 1-2. A rotating block 4 is fixedly sleeved on the side of the adjusting rod 3 located outside the clamp housing 1.
[0027] In actual operation, first rotate the rotating block 4 counterclockwise, so that the rotating block 4 drives the adjusting rod to move to one side of the rotating block 4, and the clamp 2 moves to the same position. At this time, the distance between the clamping blocks 2-2 increases, so that the material to be tested can be inserted from the feeding hole 1-1 into the clamping blocks 2-2. Then rotate the rotating block 4 clockwise, and the rotating block 4 drives the adjusting rod 3 to move to the feeding hole 1-1 side, while pushing the clamping blocks 2-2 to move. During the movement, the front end of the clamping block 2-2 contacts the clamping shell 1, and because the shape of the clamping shell 1 is a frustum structure, the front end of the clamping block 2-2 also gradually gathers and clamps the material to be tested located between the clamping blocks 2-2.
[0028] This method of clamping materials can stably hold cylindrical materials to be tested, making it more widely applicable.
[0029] Example 2
[0030] Reference Figure 3 The difference between this embodiment and the first embodiment is that a rotating rod 5 is provided on the outer periphery of the rotating block 4, and a rotating rod connecting hole 4-1 is provided on the outer periphery of the rotating block 4. The rotating rod 5 is threadedly connected to the rotating rod connecting hole 4-1. The rotating rod 5 is used to control the rotation of the rotating block 4, making the rotation more effortless.
[0031] Example 3
[0032] Reference Figure 4 The difference between this embodiment and embodiment one is that a sliding groove 1-3 is provided on the inner wall of the chuck housing 1, and a slider 6 is provided on the side of the base 2-1. The slider 6 is slidably connected to the sliding groove 1-3. When the chuck 2 moves back and forth, it will move along the direction of the sliding groove 1-3, which can avoid deviation during movement and prevent the experimental data from being deviated due to the chuck 2 being tilted during the tensile test.
[0033] Example 4
[0034] Reference Figure 5 The difference between this embodiment and embodiment one is that anti-slip texture 2-3 is provided on the side of the clamping block 2-2. The anti-slip texture can reduce the probability of slippage between the chuck shell 1 and the chuck 2 due to excessive tension, and improve the accuracy of experimental data.
[0035] Example 5
[0036] Reference Figure 6 The difference between this embodiment and embodiment one is that a notch 2-4 is provided on one side of the top of the clamping block 2-2. The notch 2-4 is provided to enable quick positioning of the material to be tested and improve the feeding rate.
Claims
1. A clamping device for tensile experiments, comprising a collet housing (1), a collet (2) and an adjustment lever (3), characterized in that The front end of the chuck housing (1) is a frustum structure with a smaller front and a larger rear. The front end of the chuck housing (1) is provided with a loading hole (1-1). The chuck (2) is located inside the chuck housing (1). The chuck (2) is composed of a base (2-1) and several clamping blocks (2-2). Several clamping blocks (2-2) are arranged in a ring on one side of the base (2-1). The clamping block (2-2) has a trapezoidal cross-section. The other side of the base (2-1) is rotatably connected to the adjusting rod (3). The rear end of the chuck housing (1) is provided with a threaded hole (1-2). One end of the adjusting rod (3) passes through the threaded hole (1-2) and is located outside the chuck housing (1). The outer periphery of the adjusting rod (3) is threadedly connected to the threaded hole (1-2). A rotating block (4) is fixedly sleeved on the side of the adjusting rod (3) located outside the chuck housing (1).
2. The clamping device for a tensile test according to claim 1, characterized in that, A rotating rod (5) is provided on the outer periphery of the rotating block (4), and a rotating rod connecting hole (4-1) is provided on the outer periphery of the rotating block (4). The rotating rod (5) is threadedly connected to the rotating rod connecting hole (4-1).
3. The clamping device for a tensile test according to claim 1, characterized in that, The inner wall of the chuck housing (1) is provided with a sliding groove (1-3), and the side of the base (2-1) is provided with a slider (6), which is slidably connected to the sliding groove (1-3).
4. The clamping device for a tensile test according to claim 1, characterized in that, The clamping block (2-2) has anti-slip texture (2-3) on its side.
5. The clamping device for a tensile test according to claim 1, characterized in that, The clamping block (2-2) has a notch (2-4) on one side of its top.