Anti-slip jaw and tensile testing apparatus

Abstract

The disclosure provides an anti-skid jaw, comprising: a first jaw having a first clamping surface; a second jaw having a second clamping surface, the second clamping surface and the first clamping surface are configured to clamp the wire together; an anti-skid tooth, a plurality of the anti-skid teeth are arranged in an array on the first clamping surface and / or the second clamping surface, and are configured to increase the clamping force of the first clamping surface and the second clamping surface, wherein, in the length direction of the first jaw, the surface of the first clamping surface and the second clamping surface is a plane and / or a curved surface. The structural design of the anti-skid tooth solves the problem of wire slipping on the clamping surface, achieves the purpose of wire anti-skid, and enables the tensile test to obtain accurate experimental results. In addition, the anti-skid tooth can reduce the concentrated stress of the end of the wire through multi-point contact, avoid the fracture of the wire in the gauge length section, avoid the loss of the wire, and improve the reliability of the experimental data.

Description

Technical Field

[0001] This disclosure relates to the field of testing equipment technology, and more specifically, to an anti-slip jaw and tensile testing equipment. Background Technology

[0002] Tensile testing equipment can determine the mechanical behavior of metal wires under tensile loads, obtaining key performance indicators such as strength, plasticity, and toughness, providing data support for material selection, process optimization, quality control, and engineering applications of metal wires. The testing process involves fixing both ends of the metal wire sample to the tensile testing equipment, applying an axial tensile load, causing it to gradually deform until fracture, and simultaneously recording the load-displacement curve.

[0003] During the axial stretching process of the tensile testing equipment, if the friction of the clamping surface is insufficient, the metal wire may slip on the clamping surface, affecting the accuracy of the tensile test data and causing the tensile test to fail. On the other hand, if the clamping force of the clamping surface is too large, it may also cause the metal wire to be damaged during the testing stage. Utility Model Content

[0004] The purpose of this disclosure is to address the technical problems in related technologies by providing an anti-slip jaw and a tensile testing device. The specific solution is as follows:

[0005] A first aspect of this disclosure provides an anti-slip jaw, comprising: a first jaw having a first clamping surface; a second jaw having a second clamping surface, the second clamping surface and the first clamping surface being configured to jointly clamp a metal wire; and anti-slip teeth, a plurality of the anti-slip teeth array being arranged on the first clamping surface and / or the second clamping surface, configured to increase the clamping force of the first clamping surface and the second clamping surface, wherein, in the length direction of the first jaw, the surfaces of the first clamping surface and the second clamping surface are planar and / or curved surfaces.

[0006] In some embodiments, the length of the plane in the length direction of the first jaw does not exceed 1 / 2 of the length of the curved surface.

[0007] In some embodiments, the first clamping surface and the second clamping surface are structurally complementary and configured to jointly clamp the metal wire.

[0008] In some embodiments, the anti-slip teeth extend in a direction perpendicular to the stretching direction of the metal wire.

[0009] In some embodiments, the anti-slip teeth are discontinuously distributed and configured to avoid forming continuous stress concentration lines to reduce localized damage to the wire.

[0010] In some embodiments, the bottom of the anti-slip teeth is a square pyramidal structure.

[0011] In some embodiments, the ends of the anti-slip teeth are arc-shaped or conical.

[0012] In some embodiments, the tooth tip angle of the anti-slip teeth is 30-60 degrees.

[0013] In some embodiments, the radius of the arc of the curved surface is 0-30 mm.

[0014] A second aspect of this disclosure provides a tensile testing device, comprising: anti-slip jaws as described above; and a base, including a first base and a second base, wherein the first jaw and the second jaw of the anti-slip jaws are respectively mounted on the first base and the second base, and the base is configured to drive the anti-slip jaws to clamp or separate.

[0015] Compared with related technologies, the above-described solutions of this disclosure have at least the following beneficial effects:

[0016] The anti-slip jaws disclosed herein feature an anti-slip tooth structure. This tooth design solves the problem of wire slippage on the clamping surface, achieving the purpose of preventing wire slippage and enabling accurate experimental results in tensile tests. Furthermore, the anti-slip teeth, through multi-point contact, reduce concentrated stress at the wire end, preventing wire breakage in the gauge section, minimizing wire loss, and improving the reliability of experimental data.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of an anti-slip pliers jaw according to an exemplary embodiment.

[0020] Figure 2 This is a partially enlarged view of a first clamping surface according to an exemplary embodiment.

[0021] Figure 3 This is an enlarged view of an anti-slip tooth according to an exemplary embodiment.

[0022] Figure 4 This is a side view of a first jaw according to an exemplary embodiment.

[0023] Figure 5 This is a schematic diagram of another anti-slip jaw structure according to an exemplary embodiment.

[0024] Figure label:

[0025] Anti-slip jaws 100, first jaws 110, first clamping surface 111, second jaws 120, second clamping surface 121, anti-slip teeth 200, first dovetail pin 310, second dovetail pin 320;

[0026] Anti-slip jaw 100', first jaw 110', first clamping surface 111', second jaw 120', second clamping surface 121', anti-slip teeth 200'. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this disclosure clearer, the disclosure will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0028] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. The singular forms “a,” “the,” and “the” as used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise; “multiple” generally includes at least two, and other quantifiers are similarly intended.

[0029] It should be understood that although the terms first, second, third, etc., may be used to describe embodiments of this disclosure, these descriptions should not be limited to these terms. These terms are only used to distinguish the described objects. For example, first may also be referred to as second without departing from the scope of embodiments of this disclosure, and similarly, second may also be referred to as first. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] It should be understood that the term "and / or" as used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0031] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0033] In related technologies, when traditional flat or conventional toothed jaws clamp metal wires, the clamping force is concentrated in a localized area of ​​the wire. When performing tensile tests on softer metal wires, excessive clamping can cause cracks on the wire surface. These cracks become the fracture source in the tensile test, causing the fracture to occur within the jaws rather than the gauge length, making the test data unable to reflect the true material properties. If the clamping force of the tensile testing equipment is insufficient, the wire will slip during the stretching process due to insufficient friction, leading to a distorted load-displacement curve and inaccurate test results. Excessive clamping force can also easily cause wire damage during the testing phase.

[0034] To address the problems existing in related technologies, this application provides an anti-slip jaw suitable for tensile testing of metal wires, comprising: a first jaw having a first clamping surface; a second jaw having a second clamping surface, wherein the second clamping surface and the first clamping surface are configured to jointly clamp the metal wire; and anti-slip teeth, wherein a plurality of the anti-slip teeth are arranged in an array on the first clamping surface and / or the second clamping surface, configured to increase the clamping force of the first clamping surface and the second clamping surface.

[0035] The anti-slip jaws disclosed herein feature an anti-slip tooth structure. This tooth design solves the problem of wire slippage on the clamping surface, achieving the purpose of preventing wire slippage and enabling accurate experimental results in tensile tests. Furthermore, the anti-slip teeth, through multi-point contact, reduce concentrated stress at the wire end, preventing wire breakage in the gauge section, minimizing wire loss, and improving the reliability of experimental data.

[0036] A first aspect of this disclosure provides an anti-slip jaw 100, the anti-slip jaw 100 including a first jaw 110 and a second jaw 120, the first jaw 110 having a first clamping surface 111; the second jaw 120 having a second clamping surface 121, the second clamping surface 121 and the first clamping surface 111 being configured to jointly clamp a metal wire.

[0037] In some embodiments, such as Figure 1 As shown, the first clamping surface 111 and the second clamping surface 121 have complementary shapes and structures. That is, the shapes, teeth, and curvatures of the first and second clamping surfaces 111 and 121 are designed to fit and conform to each other. The second clamping surface 121 is designed to complement the first clamping surface 111, allowing for a tight fit and a stable clamping space. This better clamps workpieces such as metal wires, improving clamping strength and stability, preventing workpiece slippage or damage, and ensuring smooth operation during testing and processing. The complementary structure also allows for more uniform force distribution on the metal wire, resulting in more accurate test data.

[0038] In some embodiments, such as Figure 1 , Figure 2 As shown, the first clamping surface 111 and the second clamping surface 121 are provided with anti-slip teeth 200. The anti-slip teeth 200 are configured to increase the clamping force of the first clamping surface 111 and the second clamping surface 121 on the metal wire.

[0039] In some embodiments, on the surfaces of the first clamping surface 111 and the second clamping surface 121, the extending direction of the anti-slip teeth 200 is perpendicular to the stretching direction of the metal wire. The direction of the frictional force generated by the stretching of the metal wire along its length is generally opposite to the relative motion tendency. When the metal wire is stretched, it tends to move outwards from the jaws. At this time, the perpendicular anti-slip teeth 200 can provide lateral friction to prevent the wire from slipping. The tips of the anti-slip teeth 200 perpendicular to the stretching direction generate resistance perpendicular to the stretching direction, effectively preventing slippage. Furthermore, since the extending direction of the anti-slip teeth 200 is perpendicular to the stretching direction of the metal wire, the pressure exerted by the anti-slip teeth 200 on the metal wire is also distributed in the perpendicular direction of the metal wire. This avoids generating shear stress along the stretching direction on the metal wire, reducing the occurrence of cracks.

[0040] The vertical anti-slip teeth 200 create as many contact points as possible on the first clamping surface 111 or the second clamping surface 121, allowing each tooth to apply pressure evenly rather than concentrating it on a single point. This prevents excessive localized pressure from damaging the wire while providing sufficient friction to prevent slippage. If the extension direction of the anti-slip teeth 200 forms an acute angle with the stretching direction of the wire, it may lead to stress concentration, increasing the risk of breakage. Therefore, a vertical design can help distribute pressure evenly and reduce localized damage.

[0041] In other embodiments, the first clamping surface 111 is provided with anti-slip teeth 200, and the second clamping surface 121 can be a plane. The friction force on the metal wire is increased by the anti-slip teeth 200 on one side, which is configured to enhance the clamping strength of the metal wire and prevent the metal wire from slipping.

[0042] In other embodiments, the second clamping surface 121 is provided with anti-slip teeth 200, and the surface of the first clamping surface 111 is flat. The anti-slip teeth 200 on one side increase the friction on the metal wire and prevent the metal wire from slipping.

[0043] In some embodiments, the tips of the anti-slip teeth 200 are discontinuous point-like sharp teeth. The anti-slip teeth 200 are discontinuously distributed on the surface of the first clamping surface 111 or the second clamping surface 121, and the pressure of each anti-slip tooth 200 tip is concentrated in a small area, reducing local damage to the metal wire, reducing the probability of microcrack formation, and avoiding the formation of continuous stress concentration lines on the first clamping surface 111 or the second clamping surface 121.

[0044] In some embodiments, such as Figure 3 As shown, the anti-slip teeth 200 have a square pyramid structure with four sides, a protruding tip, and a relatively wide base. This shape concentrates pressure at the tip when in contact with the metal wire, resulting in a more even distribution of force, avoiding localized overload, and increasing friction with the metal wire. Thicker metal wires compress the tip of the pyramid, absorbing excess pressure through the elastic bending of the four sides, thus enhancing the pyramid's elastic deformation capability. Thinner metal wires can be inserted into and fill gaps by the tip of the pyramid, ensuring the contact area between the anti-slip teeth 200 and the metal wire. Under the same conditions, using cylindrical teeth would easily lead to overpressure or underpressure. Therefore, the square pyramid anti-slip teeth 200 are particularly suitable for high-precision mechanical property testing of metal wires.

[0045] In some embodiments, the tooth tip angle of the anti-slip teeth 200 affects the contact area and pressure. If the tooth tip angle is less than 30 degrees, the sharp tooth tip exerts greater pressure on the metal wire, making it easier to embed the metal wire, but also easily causing damage to the metal wire and generating microcracks. If the tooth tip angle is greater than 60 degrees, the contact area between the tooth tip and the metal wire is large, the pressure is smaller, and the metal wire is not easily embedded, which may cause the metal wire to slip during the tensile test, resulting in inaccurate tensile measurement data. When the tooth height of the anti-slip teeth 200 is constant, it is necessary to ensure that when the tooth tip angle of the anti-slip teeth 200 is between 30 and 60 degrees, the embedding depth of the anti-slip teeth 200 on the metal wire is moderate, which neither damages the wire nor fails to provide sufficient friction to prevent the wire from slipping.

[0046] In some embodiments, such as Figure 1 , Figure 4 As shown, along the length of the first jaw 110, at least a portion of the first clamping surface 111 and the second clamping surface 121 are curved surfaces, while the other portion is a flat surface. The curved surface structure allows the clamped section of the metal wire to be slightly bent, and the clamping force is evenly distributed along the axial direction, avoiding the localized compression caused by traditional flat clamping. The curved arc contact path extends the contact length between the jaws and the metal wire, further increasing friction, while also reducing pressure per unit length and minimizing surface damage. Furthermore, the structural design with anti-slip teeth 200 on the curved surface can also evenly distribute stress on the first clamping surface 111 or the second clamping surface 121, reducing surface damage to the metal wire and shifting the breakage location to the gauge length.

[0047] When the first jaw 110 and the second jaw 120 clamp the metal wire, at least a portion of the clamping surface is "S"-shaped. Both the first clamping surface 111 and the second clamping surface 121 are provided with dotted, quadrangular pyramidal anti-slip teeth 200, with a square base side length of 1.5mm, evenly distributing the clamping force. The other portion of the first jaw 110 and the second jaw 120 clamps between two planes, and the lower edges of the first jaw 110 and the second jaw 120 are designed with rounded chamfers, the width of which is 3mm, to prevent the metal wire from breaking along the jaws.

[0048] In some embodiments, the anti-slip jaws 100 provided in this disclosure have strong versatility and can be adapted to metal wires of different diameters and materials. Specifically, such as Figure 3 , Figure 4As shown, the radius of the S-curve arc is defined as R, which is the distance from the center line of the surface to the vertex of the arc; the total length of the S-curve is defined as l, l = 80 mm; the tip angle of the anti-slip tooth 200 is defined as θ, which is the angle between the two legs of each isosceles triangle on the pyramid, θ = 30° to 60°; the length of the first jaw 110 and the second jaw 120 is defined as L, L = 120 mm; and the jaw width is defined as W, W = 60 mm.

[0049] This disclosure provides a highly anti-slip jaw 100. In application, different jaws can be selected according to the Vickers hardness or tensile strength of the tested metal wire. The jaws are matched with different parameters based on the Vickers hardness HV0.2 and tensile strength of the tested metal wire: when the Vickers hardness is 30-80 HV0.2 and the tensile strength is <250 N / mm 2 At that time, the S-bend radius was 0mm, the anti-slip teeth had a 200mm tip angle of 60°, the hardness was 80-120HV0.2, and the tensile strength was 250-350N / mm². 2 At this time, the S-bend radius is 0-10mm, the tooth tip angle is 60°; the hardness is 120-150HV0.2, and the tensile strength is 350-450N / mm. 2 At this time, the S-bend radius is 10-20mm, the tooth tip angle is 40°; the hardness is 150-200HV0.2, and the tensile strength is 450-600N / mm. 2 At that time, the radius of the S-bend arc is 20-30mm and the tooth tip angle is 30°. Different parameters of anti-slip jaw 100 are used for metal wires of different materials and models to adapt to the testing needs of metal wires with different performance.

[0050] In other embodiments, the first clamping surface 111' and the second clamping surface 121' of the anti-slip jaws 100' can be planar, i.e., as shown in the figure. Figure 5 As shown, the first clamping surface 111' and the second clamping surface 121' are mutually facing planes, and both planes are provided with anti-slip teeth 200'. When the first jaw 110' and the second jaw 120 clamp the metal wire together, the anti-slip teeth 200' on both planes provide frictional restraint on the metal wire, achieving the dual goals of anti-slip and reduced wire loss. This solves the problem of test failure caused by fixture defects in metal wire tensile testing, avoids metal wire loss, and improves the reliability of experimental data.

[0051] A second aspect of this disclosure provides a tensile testing device configured to clamp a metal wire for performing a tensile test on the wire. The tensile testing device includes: a fixing fixture, comprising a first fixing fixture and a second fixing fixture; and an anti-slip jaw 100 as described in any one of the first aspects of this disclosure. The first jaw 110 and the second jaw 120 of the anti-slip jaw 100 are respectively mounted on the first fixing fixture and the second fixing fixture. Specifically, the first jaw 110 has a first dovetail pin 310 on the side opposite to the first clamping surface 111, and the second jaw 120 has a second dovetail pin 320 on the side opposite to the second clamping surface 121. The first dovetail pin 310 and the second dovetail pin 320 are respectively inserted into the dovetail grooves of the first fixing fixture and the second fixing fixture. In application, the anti-slip jaw 100 can be disassembled and replaced according to the metal wire of different materials. Furthermore, the dovetail pin has chamfered ends with a chamfer width of 3mm to make the anti-slip jaws 100 easier to install and remove from the fixing clamp.

[0052] The tensile testing equipment can determine the mechanical behavior of a metal wire under tensile load, and obtain key performance indicators such as strength, plasticity, and toughness of the wire, providing data support for material selection, process optimization, quality control, and engineering applications of the wire. The testing process involves fixing both ends of the metal wire sample to the tensile testing equipment, applying an axial tensile load, causing it to gradually deform until it breaks, and simultaneously recording the load-displacement curve.

[0053] The tensile testing equipment provided in this application can prevent the metal wire from slipping or breaking due to excessive clamping force when applying axial tensile load to the metal wire.

[0054] When metal wires are used in tensile testing equipment in related technologies for tensile testing, the fracture location is concentrated in the gauge length. When using the tensile testing equipment provided in this disclosure, the curved surface with multiple anti-slip teeth 200 increases the friction force through multi-point contact and arc path when clamping the metal wire. Under the same clamping force, the anti-slip effect can be improved by 30%-50%, and the test error of the tensile strength, elongation and other indicators of the metal wire can be reduced from ±15% to within ±5%.

[0055] The specific structure, working principle, and beneficial effects of the anti-slip jaws 100 and tensile testing equipment provided in this disclosure embodiment can be referred to in any of the above embodiments of the anti-slip jaws 100 and tensile testing equipment, and will not be repeated here.

[0056] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0057] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A type of anti-slip pliers, characterized in that, include: The first jaw has a first clamping surface; The second jaw has a second clamping surface, and the second clamping surface and the first clamping surface are configured to clamp the metal wire together; Anti-slip teeth, wherein a plurality of the anti-slip teeth arrays are arranged on the first clamping surface and / or the second clamping surface, configured to increase the clamping force of the first clamping surface and the second clamping surface. Wherein, along the length direction of the first jaw, the surfaces of the first clamping surface and the second clamping surface are planar and / or curved surfaces.

2. The anti-slip jaws according to claim 1, characterized in that, In the length direction of the first jaw, the length of the plane does not exceed 1 / 2 of the length of the curved surface.

3. The anti-slip jaws according to claim 1, characterized in that, The first clamping surface and the second clamping surface have complementary structures and are configured to jointly clamp the metal wire.

4. The anti-slip jaws according to claim 1, characterized in that, The anti-slip teeth extend in a direction perpendicular to the stretching direction of the metal wire.

5. The anti-slip jaws according to claim 1, characterized in that, The anti-slip teeth are discontinuously distributed and configured to avoid forming continuous stress concentration lines, thereby reducing localized damage to the metal wire.

6. The anti-slip jaws according to claim 1, characterized in that, The bottom of the anti-slip teeth has a four-sided pyramidal structure.

7. The anti-slip jaws according to claim 6, characterized in that, The ends of the anti-slip teeth are arc-shaped or conical.

8. The anti-slip jaws according to claim 1, characterized in that, The tip angle of the anti-slip teeth is 30-60 degrees.

9. The anti-slip jaws according to claim 1, characterized in that, The radius of the arc of the curved surface is 0-30mm.

10. A tensile testing device, characterized in that, include: Anti-slip jaws as described in any one of claims 1-9; The base includes a first base and a second base; The first and second jaws of the anti-slip jaws are respectively mounted on the first base and the second base, and the base is configured to drive the anti-slip jaws to clamp or separate.

Images