Biaxial stretching clamp
By designing a clamp body with anti-slip texture and magnetic or threaded connections, the stability and damage problems when clamping small materials are solved, achieving efficient and uniform material force distribution and avoiding material tearing.
Patent Information
- Application Number
- CN202521572650.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2026-05-15
- Estimated Expiration
- 2035-07-28
AI Technical Summary
Existing clamps, when gripping small materials in both directions, suffer from excessive center-to-center spacing or the fishhook is prone to tearing the material, resulting in unstable gripping and easy damage to the material.
The clamp body consists of a base plate and a clamping plate. The clamping plate has anti-slip texture and magnetic or threaded connection. The base plate and the clamping plate are fixed by magnetic attraction or bolts. There is a chamfered surface between the clamping plate and the base plate to reduce the distance between the clamps. The anti-slip texture increases friction and reduces material damage.
It achieves stable clamping of tiny materials, reduces material damage, improves experimental efficiency and material stress uniformity, and prevents tearing.
Smart Images
Figure CN224247462U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of materials mechanics testing equipment, and particularly relates to a biaxial tensile clamp. Background Technology
[0002] Materials mechanics testing includes tensile, compression, and bending tests to determine the mechanical properties of different materials. Existing technologies typically use large clamps or small clamps with hooks to hold tiny materials in conjunction with stretching machines for testing. Common micro-biomaterials include blood vessels, esophagus, Achilles tendons, and biomembranes.
[0003] Regarding the existing related technologies mentioned above, the inventors believe that the following technical defects exist: When using clamps for bidirectional clamping, four clamps need to be set up in pairs opposite each other to clamp the top, bottom, left, and right sides of the material respectively. Since the clamps of the large clamps are rectangular, when the clamps are joined together, the center-to-center distance is too large, making it impossible to secure small materials. Furthermore, the fishhooks on the small clamps typically need to pierce the material, which can easily lead to tearing. Additionally, the hook tips are prone to fatigue bending after prolonged stress, making it difficult to hook the material. Therefore, the existing related technologies require further improvement. Utility Model Content
[0004] This application provides a biaxial tension clamp to address at least one technical problem in existing related technologies: when using the clamp for bidirectional clamping, four clamps need to be arranged in pairs opposite each other to clamp the upper, lower, left, and right sides of the material respectively. Since the large clamp's jaws are rectangular, when the jaws are combined, the center-to-center distance is too large, making it impossible to secure small materials. The hooks on the small clamps, which typically pierce the material, easily tear it, and the hook tips are prone to fatigue bending under stress, making it difficult to hook the material.
[0005] This application provides a biaxial tension fixture, including a fixture body, the fixture body comprising:
[0006] A base plate; a clamping plate, the clamping plate being detachably mounted on the base plate and cooperating with the base plate to form a clamp for holding the test material; both sides of the base plate and the clamping plate that are close to each other are provided with anti-slip textures for restricting the test material.
[0007] Optionally, the anti-slip texture is a continuously distributed three-dimensional raised structure.
[0008] Optionally, the cross-section of each individual protrusion of the anti-slip texture is trapezoidal or triangular.
[0009] Optionally, the anti-slip textured surface is coated with a biocompatible coating.
[0010] Optionally, a first magnetic attraction part is provided on the base plate, and a second magnetic attraction part that attracts the first magnetic attraction part is provided at a corresponding position on the clamping plate.
[0011] Optionally, the clamping plate has a first chamfered surface symmetrically machined on two opposite sides along the width direction, and the bottom plate has a second chamfered surface symmetrically machined on two opposite sides along the width direction, wherein the chamfering angle corresponding to the first chamfered surface is equal to the chamfering angle corresponding to the second chamfered surface.
[0012] Optionally, the chamfer angle corresponding to the first chamfered surface and the chamfer angle corresponding to the second chamfered surface are both 45 degrees.
[0013] Optionally, the clamping plate has a protruding locking block on the side near the base plate, and the base plate has a recessed matching locking groove. When the clamping body is in the clamping state, the locking block is embedded in the locking groove.
[0014] Optionally, a first connecting hole is provided through the base plate, and a second connecting hole is provided through the clamping plate. When the clamping body is in the clamping state, the first connecting hole and the second connecting hole are in communication.
[0015] Optionally, the clamp body is made of cemented carbide material.
[0016] In this embodiment, during use, the clamp is removed from the corresponding base plate, and the four corners or four sides of the test material are placed as evenly as possible on the base plate. Then, the clamp is fixed to the base plate, and the test material is secured by the anti-slip texture. Finally, a biaxial tensile test is performed on the test material using a tensile testing machine. The overall structure is simple and ingenious, easy to operate, and improves testing efficiency. It offers good clamping stability and ensures uniform stress on the test material. Compared to the method of fixing with a fishhook piercing, it significantly reduces surface damage to the test material and prevents tearing. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.
[0019] Figure 1 This is a schematic diagram of a biaxial tension fixture provided in an embodiment of this application.
[0020] Figure 2 for Figure 1 A schematic diagram of the structure of a biaxial tension clamp from another perspective.
[0021] Figure 3 for Figure 1 Enlarged view of part A in the middle.
[0022] Figure 4 This is a schematic diagram of another biaxial tension fixture structure provided in an embodiment of this application.
[0023] Figure 5 for Figure 4 A schematic diagram of a biaxial tension clamp in the clamping state.
[0024] Figure 6 This is a top view of four biaxial tension clamps in the embodiments of this application, arranged in a cross shape.
[0025] Explanation of reference numerals in the attached figures:
[0026] 100. Clamp body; 101. Chuck; 102. Anti-slip texture;
[0027] 110. Base plate; 111. Clamping part; 112. First anti-slip surface; 113. Slot; 114. First magnetic suction part; 115. Fixing notch; 116. First connecting hole; 117. Fixing hole; 118. First chamfered surface; 119. Connecting part;
[0028] 120. Clamping plate; 121. Second anti-slip surface; 122. Locking block; 123. Second magnetic suction part; 124. Second connecting hole; 125. Second chamfered surface. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0030] This application provides a biaxial tension clamp to address at least one technical problem in existing related technologies: when using the clamp for bidirectional clamping, four clamps need to be arranged in pairs facing each other to clamp the upper, lower, left, and right sides of the material respectively. Since the large clamp's gripper head is rectangular, when the grippers are combined, the center-to-center distance is too large, making it impossible to secure small materials. Furthermore, the hooks on the small clamps, which typically pierce the material, can easily tear it, and the hook tips are prone to fatigue bending after prolonged stress, making it difficult to hook the material. The following description, in conjunction with the accompanying drawings, will illustrate this issue.
[0031] Reference Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a biaxial tension fixture provided in an embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the structure of a biaxial tensile clamp from another perspective. An embodiment of this application shows a biaxial tensile clamp including a clamp body 100. Specifically, the clamp body 100 includes a base plate 110 and a clamping plate 120. The clamping plate 120 is detachably mounted on the base plate 110 and cooperates with the base plate 110 to form a chuck 101 for clamping materials. Furthermore, both sides of the base plate 110 and the clamping plate 120 that are close to each other are provided with anti-slip textures 102 for restricting the test material.
[0032] The fixture body 100 can be made of hard alloy materials such as high-speed steel to improve the hardness and fatigue resistance of the fixture and extend its service life. The base plate 110 includes a clamping part 111 for forming a chuck 101. The clamping part 111 can be set as a rectangular block, and the clamping plate 120 is also set as a matching rectangular block. Specifically, in order to facilitate the fixing of the fixture to the stretching machine, the base plate 110 also includes a connecting part 119 located at the other end of the clamping part 111. One end of the clamping plate 120 abuts against one side of the connecting part 119. The connecting part 119 is provided with a fixing notch 115 and a fixing hole 117 for connecting and fixing with the stretching machine. The fixture can be clamped and fixed at a predetermined position on the stretching machine with the cooperation of fasteners such as bolts.
[0033] Furthermore, in some embodiments, the detachable connection between the clamping plate 120 and the base plate 110 can be achieved by magnetic attraction. Specifically, a first magnetic attraction part 114 can be provided on the base plate 110, and a second magnetic attraction part 123 that attracts the first magnetic attraction part 114 can be provided at a corresponding position on the clamping plate 120. For example, the first magnetic attraction part 114 and the second magnetic attraction part 123 can be set as neodymium magnets with a large magnetic force that attract each other. The clamping plate 120 is pressed tightly against the base plate 110 by magnetic force, which achieves the purpose of clamping and also facilitates disassembly and assembly.
[0034] Furthermore, in some embodiments, if the test tensile force is large and the magnetic attraction is not easily able to provide sufficient clamping force, the connection stability between the clamping plate 120 and the base plate 110 can be further increased by means of a threaded connection. Specifically, a first connecting hole 116 can be provided through the base plate 110, and a second connecting hole 124 can be provided through the corresponding position on the clamping plate 120. Both the first connecting hole 116 and the second connecting hole 124 are internal threaded holes. When the clamping plate 120 is tightly attached to the base plate 110, the first connecting hole 116 and the second connecting hole 124 are connected. Then, bolts or screws are screwed into the first connecting hole 116 and the second connecting hole 124 in sequence to achieve a stable connection between the clamping plate 120 and the base plate 110, so as to prevent the test material from falling off the fixture due to excessive tensile force.
[0035] Furthermore, in some embodiments, in order to better achieve the fit between the clamping plate 120 and the base plate 110 and to accurately connect the first connecting hole 116 and the second connecting hole 124, a locking block 122 is protruding on the side of the clamping plate 120 near the base plate 110, and a matching locking groove 113 is recessed at the corresponding position on the base plate 110. In addition, the first magnetic attraction part 114 can be set at the bottom of the groove 113, and the second magnetic attraction part 123 can be set on the side of the locking block 122 near the groove 113. Under the action of magnetic force, when the clamping plate 120 is pressed against the base plate 110, the locking block 122 is embedded in the groove 113, thereby accurately connecting the first connecting hole 116 and the second connecting hole 124, and better achieving the engagement between the clamping plate 120 and the base plate 110, which further helps to improve the clamping stability.
[0036] Furthermore, in conjunction with reference Figure 3 , Figure 3 for Figure 1 Enlarged view of section A. The anti-slip texture 102 can be set as a continuous and uniformly distributed three-dimensional raised structure. The cross-section of a single raised part can be trapezoidal, triangular, or other shapes. The height of the raised part and the spacing between adjacent raised parts can be selected and set according to specific design requirements.
[0037] Specifically, the anti-slip texture 102 in this embodiment includes anti-slip texture 102 disposed on the first anti-slip surface 112 and anti-slip texture 102 disposed on the second anti-slip surface 121. Most of the tiny test materials are soft materials. When the clamp holds the test materials, some of the test materials are embedded in the protrusion gaps on the first anti-slip surface 112 or the second anti-slip surface 121 due to compression. In this way, the friction between the test materials and the clamp is increased, the local pressure is enhanced, and the test materials can be effectively prevented from falling off, the clamping stability is improved, and the force on the test materials is also ensured to be uniform. Compared with the method of fixing by piercing with a fishhook, the surface damage of the test materials can be greatly reduced, and the tearing of the test materials can be prevented.
[0038] Furthermore, in some embodiments, a biocompatible coating can be applied to the surface of the anti-slip texture 102. Specifically, a biocompatible coating is uniformly applied to the first anti-slip surface 112 and the second anti-slip surface 121 respectively, so as to better fix the test material and prevent damage to the test material.
[0039] Furthermore, refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of another biaxial tension fixture structure provided in an embodiment of this application. Figure 5 for Figure 4 This is a schematic diagram of a biaxial tensile clamp in the clamping state. In some embodiments, to facilitate the clamping of smaller test materials and improve its applicability, a first chamfered surface 118 is symmetrically machined on two opposite sides of the clamping plate 120 along the width direction, and a second chamfered surface 125 is symmetrically machined on two opposite sides of the clamping portion 111 of the base plate 110 along the width direction. The chamfer angles corresponding to the first chamfered surface 118 and the second chamfered surface 125 can both be set to 45 degrees. Thus, when the four clamps arranged in pairs opposite each other along the cross are combined, the distance formed between the four clamps 101 is small enough, which facilitates the clamping of small test materials of different sizes and improves the applicability of the clamp.
[0040] The working principle of a biaxial tension fixture in this application embodiment is roughly as follows:
[0041] like Figure 6 As shown, the four clamps are arranged in a cross shape, facing each other in pairs. The clamping plates 120 are removed from their respective base plates 110. The four corners or sides of the test material are placed as evenly as possible on the base plates 110. Then, the clamping plates 120 are placed over the base plates 110, and magnetic attraction is used to firmly attach the clamping plates 120 to the base plates 110. This achieves biaxial fixation of the test material. When the magnetic attraction is insufficient to provide adequate clamping force due to high tensile strength, bolts or screws can be screwed into the corresponding first connecting holes 116 and second connecting holes 124 to connect and fix the base plates 110 and clamping plates 120, thus achieving biaxial fixation of the test material. Finally, a biaxial tensile test is performed on the test material using a tensile testing machine.
[0042] The overall structure is simple and ingenious, easy to operate, and conducive to improving test efficiency. It has high applicability, good clamping stability, and uniform stress on the test material. Compared with the fishhook piercing and fixing method, it can greatly reduce surface damage to the test material and prevent the test material from being torn.
[0043] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0044] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0045] The biaxial tension fixture provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A biaxial tension clamp, comprising a clamp body (100), characterized in that, The fixture body (100) includes: a base plate (110); a clamping plate (120), the clamping plate (120) being detachably mounted on the base plate (110) and cooperating with the base plate (110) to form a clamp (101) for holding the test material; both sides of the base plate (110) and the clamping plate (120) that are close to each other are provided with anti-slip textures (102) for restricting the test material.
2. The biaxial tension clamp according to claim 1, characterized in that, The anti-slip texture (102) is a continuously distributed three-dimensional raised structure.
3. A biaxial tensioning fixture according to claim 2, characterized in that, The cross-section of a single protrusion of the anti-slip texture (102) is trapezoidal or triangular.
4. A biaxial tension clamp according to any one of claims 1 to 3, characterized in that, The surface of the anti-slip texture (102) is coated with a biocompatible coating.
5. A biaxial tensioning fixture according to claim 4, characterized in that, The base plate (110) is provided with a first magnetic attraction part (114), and the clamping plate (120) is provided with a second magnetic attraction part (123) that attracts the first magnetic attraction part (114) at a corresponding position.
6. A biaxial tensioning fixture according to claim 5, characterized in that, The clamping plate (120) has a first chamfered surface (118) symmetrically processed on two opposite sides along the width direction, and the base plate (110) has a second chamfered surface (125) symmetrically processed on two opposite sides along the width direction. The chamfering angle corresponding to the first chamfered surface (118) is equal to the chamfering angle corresponding to the second chamfered surface (125).
7. A biaxial tensioning fixture according to claim 6, characterized in that, The chamfer angle corresponding to the first chamfered surface (118) and the chamfer angle corresponding to the second chamfered surface (125) are both 45 degrees.
8. A biaxial tensioning fixture according to claim 4, characterized in that, The clamping plate (120) has a protruding locking block (122) on the side near the base plate (110), and the base plate (110) has a recessed matching locking groove (113). When the clamping body (100) is in the clamping state, the locking block (122) is embedded in the locking groove (113).
9. A biaxial tensioning fixture according to claim 4, characterized in that, A first connecting hole (116) is provided through the base plate (110), and a second connecting hole (124) is provided through the clamping plate (120). When the clamping body (100) is in the clamping state, the first connecting hole (116) and the second connecting hole (124) are connected.
10. A biaxial tensioning fixture according to claim 4, characterized in that, The clamp body (100) is made of hard alloy material.