A clamp for breaking tension test of steel wire rope
By designing a wire rope breaking tensile test fixture including the outer shell and the inner fixture, the problems of insufficient versatility and ineffective test in the prior art are solved, and stable clamping and efficient tests of wire ropes of different sizes are achieved.
Patent Information
- Application Number
- CN202421130230.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The existing wire rope breaking tensile force test fixtures have problems such as insufficient versatility and failure of the wire rope at the clamping site, resulting in ineffective tests.
A fixture including an outer shell and an inner fixture is designed. The outer shell is a tubular structure. The inner fixture consists of three fixture pieces of the same shape and size, forming a round table-like structure, which can be suitable for steel wire ropes of different sizes, and avoid local stress concentration in the clamping part through the round table-shaped cavity structure.
Reliable and stable clamping of wire ropes of different sizes is achieved, the versatility and efficiency of the test is improved, the problem of ineffective tests is avoided, and cost savings.
Smart Images
Figure CN222748406U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of wire rope clamps, and in particular to a clamp used for a wire rope breaking tension test. Background Art
[0002] According to the relevant regulations of wire rope (GB / T20118-2017, General Technical Conditions for Wire Rope), there are two methods to determine the actual breaking force of wire rope, one is to measure the breaking force, and the other is to measure the total breaking force of the wire. The determination method generally needs to be selected based on the accuracy of the test results and the complexity of the test operation.
[0003] Among them, for the method of measuring the sum of the breaking tensile forces of steel wires, a tensile test is performed on a single steel wire, and the breaking tensile forces of the single steel wires after being split are added together to obtain the sum of the breaking tensile forces of the measured steel wires. However, splitting a whole steel wire rope according to the number of strands and straightening it until it can reach the state for testing is not only cumbersome and laborious, but also has high labor and equipment costs. Therefore, the method of measuring the breaking tensile force is generally chosen.
[0004] As for the actual measurement of breaking tension method, according to the relevant regulations (GB / T8358-2023). There are three ways to prepare wire rope specimens: the first is the alloy casting method specimen preparation; the second is the resin casting method specimen preparation; the third is the casing pressing method specimen preparation. Among them, the first and second specimen preparation methods require pouring / casting work (the first requires alloy casting, and the second requires resin casting), which is not only cumbersome and laborious, but also has high labor and equipment costs. At the same time, special horizontal tensile test equipment is required for breaking tests, which is not very economical. Therefore, the casing pressing method is generally chosen for specimen preparation.
[0005] However, for the specimen preparation method using the casing pressing method, the existing metal casings are not very versatile and are prone to the problem of invalid tests due to wire rope breakage at the clamping position. Therefore, how to design a wire rope breaking tensile test fixture that has high versatility and can avoid the wire rope breakage at the clamping position, thereby causing the test to be invalid, has become an urgent problem to be solved. Utility Model Content
[0006] In order to solve the technical problems in the related art, the present application provides a clamp for breaking tension test of steel wire rope. The clamp for breaking tension test of steel wire rope of the present application can not only reliably and stably clamp the steel wire rope for breaking tension test, but also has high versatility. At the same time, it can also effectively avoid the problem of invalid test due to breaking of steel wire rope at the clamping part, so as to save test cost and improve test efficiency.
[0007] In order to achieve the above-mentioned purpose, the technical solution adopted in this application is: a clamp for breaking tension test of steel wire rope, comprising:
[0008] The outer shell is formed into a tubular structure, and the inner diameter of the outer shell gradually decreases in a direction from one end of the outer shell to the other end;
[0009] The inner clamp comprises three clamp pieces of the same shape and size, the inner clamp forms an inverted truncated cone structure with a hollow interior, and the outer circumference of the inner clamp matches the inner circumference of the outer shell so that the inner clamp can be accommodated in the outer shell; the inner hollow interior of the inner clamp is used to accommodate the wire rope;
[0010] Among them, the internal hollow of the inner clamp includes a first part and a second part, one end of the first part extends to the large end of the inner clamp to make one end of the first part open, the other end of the first part is connected with the second part, the second part is formed as a truncated cone-shaped cavity, and the large end of the second part extends to the small end of the inner clamp to make the large end of the second part open, and the small end of the second part is connected with the first part.
[0011] Optionally, the outer shell includes a first end and a second end that are arranged opposite to each other, and the inner diameter corresponding to the second end is smaller than the inner diameter corresponding to the first end;
[0012] The end surface of the second end is formed as an annular curved surface, which includes a first annular edge arranged on the outside and a second annular edge arranged on the inside. In the direction from the first annular edge to the second annular edge, the height of the second end gradually increases.
[0013] Optionally, the length of the inner clamp is greater than the length of the outer shell, so that the small end of the inner clamp at least partially protrudes from the outer shell.
[0014] Optionally, the inner clamp further comprises a plurality of friction strips, and the plurality of friction strips are arranged at intervals in the first portion along the axial direction of the inner clamp.
[0015] Optionally, the friction strip is configured as an annular structure.
[0016] Optionally, the first part is formed as a truncated cone-shaped cavity, the large end of the first part extends to the large end of the inner clamp, and the small end of the second part is communicated with the small end of the second part.
[0017] Optionally, the diameter of the large end of the first part is 10 mm, and the diameter of the small end of the first part is 8 mm; or,
[0018] The diameter of the large end of the first part is 12 mm, and the diameter of the small end of the first part is 10 mm.
[0019] Optionally, the inner clamp further includes a buckle groove and an elastic buckle strip, the buckle groove is configured to be annular and formed on the outer peripheral surface of the large end of the inner clamp, and the buckle groove is used to accommodate the elastic buckle strip.
[0020] Optionally, the cross-section of the buckle groove is formed into a semicircle.
[0021] Optionally, the outer diameter of the outer shell is 60 mm to 70 mm, the length of the outer shell is 60 mm to 80 mm, the angle A between the inner surface and the outer surface of the outer shell satisfies: 6°≤A≤9°, and the maximum inner diameter R of the outer shell is max Meet 35mm≤R max ≤45mm, the minimum inner diameter R of the outer shell min Meet 20mm≤R min ≤30mm;
[0022] The maximum outer diameter of the inner clamp is 30 mm to 50 mm, the minimum outer diameter of the inner clamp is 15 mm to 25 mm, and the length of the inner clamp is 70 mm to 90 mm.
[0023] Beneficial effects:
[0024] 1. Through the above technical solution, on the one hand, the inner clamp of the present application is formed by combining three clamp pieces of the same shape and size. When it is suitable for steel wire ropes of different sizes, the three clamp pieces can be tightly attached to the surface of steel wire ropes of different sizes from three different directions, so that steel wire ropes of different sizes can be reliably and stably clamped. In other words, the clamp for the breaking tensile test of steel wire ropes of the present application is highly versatile on the basis of being able to reliably and stably clamp the steel wire rope for breaking tensile test, so that it can be used for the clamping needs of steel wire ropes of different sizes. In this way, compared with the existing related technology, when it is necessary to conduct breaking tensile test of steel wire ropes of different sizes, there is no need to replace the metal sleeve, which can effectively improve the test efficiency.
[0025] On the other hand, the inner clamp of the present application is used to accommodate the inner hollow of the steel wire rope and includes a first part and a second part, wherein the first part is used to accommodate the steel wire rope, and the inner clamp part corresponding to the first part can tightly clamp the steel wire rope, and the second part is constructed as a truncated cone-shaped cavity, so that the inner clamp part corresponding to the second part can have a certain distance from the steel wire rope to avoid damaging the steel wire rope or causing local stress concentration during the clamping process. In this way, the problem of invalid test caused by the breakage of the steel wire rope at the clamping position can be effectively avoided. It is also possible to avoid repeated preparation of tests and repeated tests, which is not only conducive to saving costs, but also conducive to further improving test efficiency.
[0026] 2. Other beneficial effects or advantages of the present application will be described in detail in conjunction with the specific structure in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor. In addition, it should be understood that the proportional relationship of the various components in the drawings of this specification does not represent the proportional relationship in the actual material selection and design, which is only a schematic diagram of the structure or position, where:
[0028] Figure 1 is a three-dimensional structural schematic diagram of a clamp for a breaking tensile test of a steel wire rope provided by an exemplary embodiment of the present application from one perspective, wherein a portion of the steel wire rope is also shown;
[0029] Figure 2 is a schematic diagram of a three-dimensional structure of a clamp for a breaking tensile test of a steel wire rope provided by an exemplary embodiment of the present application from another perspective, wherein a portion of the steel wire rope is also shown;
[0030] Figure 3 is a schematic diagram of a three-dimensional structure of a partially cut-away perspective of an outer shell provided by an exemplary embodiment of the present application;
[0031] Figure 4 is a cross-sectional view of an outer shell provided by an exemplary embodiment of the present application;
[0032] Figure 5 is a schematic diagram of a three-dimensional structure of an inner clamp provided by an exemplary embodiment of the present application, wherein an elastic buckle strip locks three clamp pieces;
[0033] Figure 6It is a schematic diagram of the three-dimensional structure of a clamp sheet provided in an exemplary embodiment of the present application.
[0034] Description of the reference numerals in the accompanying drawings:
[0035] 100-clamp for breaking tension test of steel wire rope; 200-steel wire rope; 1-outer shell; 11-first end; 12-second end; 121-annular curved surface; 1211-first annular edge; 1212-second annular edge; 2-inner clamp; 21-clamp plate; 22-first part; 23-second part; 24-friction strip; 25-buckle groove; 26-elastic buckle strip. DETAILED DESCRIPTION
[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0038] In order to facilitate relevant technical personnel to have a clearer and more accurate understanding of the technical solution of this application, the existing related technologies are first described in more detail below.
[0039] At present, the existing casing pressing method sample preparation method generally uses metal casings to pass through both ends of the wire rope, and then presses it firmly on a press, and finally clamps the metal casing using the corresponding clamping position in the breaking tensile test equipment, and then starts the breaking tensile test equipment to perform the wire rope breaking tensile test.
[0040] However, in order to ensure the firmness of the pressing, corresponding metal sleeves are generally used according to the actual size of the wire rope. For example, metal sleeves of corresponding sizes are generally used for 8 mm, 10 mm, and 12 mm wire ropes, respectively. In this way, when breaking tensile tests are required on wire ropes of different sizes, different metal sleeves need to be replaced and pressed, which will make the test efficiency relatively low.
[0041] At the same time, during the test, when the metal sleeve is pressed by a press machine, the part where the wire rope is wrapped by the metal sleeve (i.e., the clamping part) may be partially damaged to a certain extent (or locally damaged due to local stress concentration), which may cause the wire rope to break easily at the clamping part during the breaking tensile test. In this case, the test result is invalid. Therefore, it is necessary to prepare the sample again and re-perform the breaking tensile test, which is not only costly and wasteful, but also makes the test efficiency relatively low.
[0042] The present application has designed a brand-new clamp, namely the clamp for breaking tensile test of wire rope, which can not only reliably and stably clamp the wire rope for breaking tensile test, but also has high versatility. At the same time, it can also effectively avoid the problem of invalid test due to breaking of wire rope at the clamping part, so as to save test cost and improve test efficiency.
[0043] The technical solution of the present application is described in detail below with reference to the accompanying drawings.
[0044] Example 1
[0045] like Figures 1 to 6 As shown, this embodiment provides a clamp 100 for breaking tensile test of steel wire rope, comprising an outer shell 1 and an inner clamp 2. The outer shell 1 is formed into a tubular structure, and the inner diameter of the outer shell 1 gradually decreases in the direction from one end of the outer shell 1 to the other end. The inner clamp 2 includes three clamp pieces 21 of the same shape and size, and the inner clamp 2 forms an inverted truncated cone structure with a hollow interior, and the outer circumferential surface of the inner clamp 2 matches the inner circumferential surface of the outer shell 1 so that the inner clamp 2 can be accommodated in the outer shell 1; the inner hollow interior of the inner clamp 2 is used to accommodate the steel wire rope 200;
[0046] Among them, the internal hollow of the inner clamp 2 includes a first part 22 and a second part 23, one end of the first part 22 extends to the large end of the inner clamp 2 to make one end of the first part 22 open, and the other end of the first part 22 is connected with the second part 23, the second part 23 is formed into a truncated cone-shaped cavity, and the large end of the second part 23 extends to the small end of the inner clamp 2 to make the large end of the second part 23 open, and the small end of the second part 23 is connected with the first part 22.
[0047] Through the above technical solution, on the one hand, the inner clamp 2 of the present application is formed by combining three clamp pieces 21 of the same shape and size. When it is suitable for steel wire ropes 200 of different sizes, the three clamp pieces 21 can be tightly attached to the surface of steel wire ropes 200 of different sizes from three different directions, so that steel wire ropes 200 of different sizes can be reliably and stably clamped. In other words, the clamp 100 for the breaking tensile test of the steel wire rope of the present application is highly versatile on the basis of being able to reliably and stably clamp the steel wire rope 200 for the purpose of breaking tensile test, so that it can be used for the clamping needs of steel wire ropes 200 of different sizes. In this way, compared with the existing related technology, when it is necessary to conduct breaking tensile tests on steel wire ropes 200 of different sizes, there is no need to replace the metal sleeve, which can effectively improve the test efficiency.
[0048] On the other hand, the inner clamp 2 of the present application is used to accommodate the inner hollow of the steel wire rope 200, and includes a first part 22 and a second part 23, wherein the first part 22 is used to accommodate the steel wire rope 200, and the inner clamp 2 part corresponding to the first part 22 can tightly clamp the steel wire rope 200, and the second part 23 is constructed as a truncated cone-shaped cavity, so that the inner clamp 2 part corresponding to the second part 23 can have a certain distance from the steel wire rope 200, so as to avoid damaging the steel wire rope 200 or causing local stress concentration during the clamping process. In this way, the problem of invalid test caused by the breakage of the steel wire rope 200 at the clamping position can be effectively avoided. It is also possible to avoid repeated preparation of tests and repeated tests, which is not only conducive to saving costs, but also conducive to further improving test efficiency.
[0049] The working process / working principle of the clamp 100 for the wire rope breaking tensile test of the present application for clamping the wire rope 200 can be:
[0050] When one end of the steel wire rope 200 needs to be clamped, firstly, the three clamp pieces 21 are assembled into the inner clamp 2, and then one end of the steel wire rope 200 is inserted into the inner hollow of the inner clamp 2 (i.e., the steel wire rope 200 is inserted into the assembled inner clamp 2 along the direction from the first part 22 to the second part 23), and then the inner clamp 2 is inserted into the outer shell 1, so that the three clamp pieces 21 can tightly clamp one end of the steel wire rope 200. Similarly, the other end of the steel wire rope 200 is also clamped.
[0051] Subsequently, the outer casings 1 at both ends of the steel wire rope 200 can be clamped in a breaking tension test device to perform a breaking tension test.
[0052] It can be understood that during the test, since the three clamp pieces 21 are tightly attached to the wire rope 200, when the wire rope 200 is pulled, the inverted frustum-shaped inner clamp 2 composed of the three clamp pieces 21 will be able to become tighter and tighter with the outer shell 1, so that the wire rope 200 can be pulled tighter and tighter, so as to avoid the wire rope 200 from falling off during the test.
[0053] In actual use, since the change of the inner diameter of the outer shell 1 is relatively gentle and the difference is small, it is difficult to quickly and accurately distinguish the two ends of the outer shell 1 in the test environment, which will reduce the test efficiency to a certain extent. In addition, there may be a problem of inserting the inner fixture 2 into the outer shell 1 in the reverse direction (that is, inserting the inner fixture 2 into the end of the outer shell 1 corresponding to the smaller inner diameter first). If the problem of reverse insertion occurs, the inner fixture 2 needs to be removed and reinserted into the inner fixture 2 (the wire rope 200 and the inner fixture 2 may also separate from each other during this process), which will further reduce the test efficiency.
[0054] In view of this, in one embodiment of the present application, Figure 3 and Figure 4 As shown, the outer shell 1 of the present application may include a first end 11 and a second end 12 arranged opposite to each other, and the inner diameter corresponding to the second end 12 is smaller than the inner diameter corresponding to the first end 11; wherein the end face of the second end 12 is formed as an annular surface 121, and the annular surface 121 includes a first annular edge 1211 arranged on the outside and a second annular edge 1212 arranged on the inside, and in the direction from the first annular edge 1211 to the second annular edge 1212, the height of the second end 12 gradually increases.
[0055] In this way, the end surface of the first end 11 and the end surface of the second end 12 of the outer shell 1 can be made into completely different shapes (for example, see Figure 4 , the end surface of the first end 11 can be formed into a flat surface, while the end surface of the second end 12 can be formed into a curved convex surface). In this way, the operator can accurately distinguish the two ends of the outer shell 1 with different inner diameters only by touch, thereby quickly and accurately distinguishing the two ends of the outer shell 1 and avoiding the problem of inserting the inner fixture 2 in the reverse direction, so as to further improve the test efficiency.
[0056] In one embodiment of the present application, Figure 1 and Figure 2As shown, the length of the inner clamp 2 of the present application is greater than the length of the outer shell 1, so that the small end of the inner clamp 2 at least partially extends out of the outer shell 1. In this way, during the loading and testing process, at least part of the small end of the inner clamp 2 will extend out of the outer shell 1, which can effectively avoid the possibility of the steel wire rope 200 being broken by the inner clamp 2 during the tension process, which is conducive to making the breaking position of the steel wire rope 200 appear at the non-clamping position of the steel wire rope 200, thereby further avoiding the problem of the steel wire rope 200 breaking at the position clamped by the inner clamp 2 and causing the test to be invalid.
[0057] In one embodiment of the present application, Figure 6 As shown, the inner clamp 2 of the present application may further include a plurality of friction strips 24, which are arranged at intervals on the first portion 22 along the axial direction of the inner clamp 2. In this way, the plurality of friction strips 24 can effectively increase the roughness of the inner surface of the inner clamp 2 corresponding to the first portion 22, so as to clamp the steel wire rope 200 more stably and reliably.
[0058] It can be understood that the friction strips 24 of the present application can have various arrangements. For example, in one embodiment, multiple friction strips 24 are respectively arranged on three clamp plates 21, and the multiple friction strips 24 on the three clamp plates 21 are spaced apart from each other and do not contact each other, that is, the multiple friction strips 24 are arranged in a gradient.
[0059] In another embodiment of the present application, the friction strip 24 of the present application can also be set as an annular structure, that is, multiple friction strips 24 are respectively set on three clamp plates 21, and the multiple friction strips 24 on the three clamp plates 21 are in one-to-one contact and combined annular structure.
[0060] In one embodiment of the present application, the first part 22 of the present application can be formed into a truncated cone-shaped cavity, the large end of the first part 22 extends to the large end of the inner clamp 2, and the small end of the second part 23 is connected to the small end of the second part 23. In this way, it is not only conducive to making the steel wire rope 200 more and more tight during the stretching process, effectively avoiding the problem of the steel wire rope 200 falling off, but also conducive to making the inner clamp 2 of the present application applicable to steel wire ropes 200 of different sizes, so as to further improve the versatility of the present application.
[0061] For example, in a specific embodiment of the present application, the diameter of the large end of the first part 22 of the present application can be set to 10 mm, and the diameter of the small end of the first part 22 can be set to 8 mm. In this way, by setting the first part 22 in this way, the clamp of the present application can be suitable for clamping the steel wire rope 200 with a diameter of 8 mm to 10 mm.
[0062] In another specific embodiment of the present application, the diameter of the large end of the first part 22 of the present application can be set to 12 mm, and the diameter of the small end of the first part 22 can be set to 10 mm. In this way, by setting the first part 22 in this way, the clamp of the present application can be suitable for clamping the steel wire rope 200 with a diameter of 10 mm to 12 mm.
[0063] In actual use, since the inner clamp 2 includes three clamp pieces 21, when the operator uses the three clamp pieces 21 to clamp the wire rope 200, there are many parts that need to be controlled (including the three clamp pieces 21 and the wire rope 200), which makes the operation inconvenient and often requires help from others.
[0064] In view of this, in one embodiment of the present application, Figure 5 and Figure 6 As shown, the inner clamp 2 of the present application may further include a buckle groove 25 and an elastic buckle strip 26 . The buckle groove 25 is arranged to be annular and is formed on the outer peripheral surface of the large end of the inner clamp 2 . The buckle groove 25 is used to accommodate the elastic buckle strip 26 .
[0065] In this way, through the buckle groove 25 and the elastic buckle strip 26 arranged in this way, the three clamp pieces 21 can have a certain relative range of movement (that is, the three clamp pieces 21 can move relatively to a certain extent to facilitate the insertion of the wire rope 200) while preventing the three clamp pieces 21 from scattering, which is beneficial to improving the operator's control convenience over the three clamp pieces 21, so that a single operator can complete the clamping of the wire rope 200, thereby improving the operational convenience of the clamp of the present application.
[0066] In one embodiment of the present application, Figure 6 As shown, the cross section of the buckle groove 25 of the present application can be formed into a semicircular shape. The semicircular buckle groove 25 can not only facilitate the installation and removal of the elastic buckle strip 26, but also effectively ensure the restrictive effect of the elastic buckle strip 26 on the three clamp pieces 21.
[0067] In a specific embodiment of the present application, the outer diameter of the outer shell 1 of the present application can be set to 60 mm to 70 mm, the length of the outer shell 1 can be set to 60 mm to 80 mm, the angle A between the inner surface and the outer surface of the outer shell 1 satisfies: 6°≤A≤9° (that is, the cone angle corresponding to the inner wall of the outer shell 1 is 12° to 18°), and the maximum inner diameter R of the outer shell 1 max Meet 35mm≤R max ≤45mm, minimum inner diameter R of outer shell 1 min Meet 20mm≤R min≤30mm; the maximum outer diameter of the inner fixture 2 can be set to 30 mm to 50 mm, the minimum outer diameter of the inner fixture 2 can be set to 15 mm to 25 mm, and the length of the inner fixture 2 can be set to 70 mm to 90 mm.
[0068] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A clamp for breaking tension test of steel wire rope, characterized in that: include: The outer shell (1) is formed into a tubular structure, and the inner diameter of the outer shell (1) gradually decreases in a direction from one end of the outer shell (1) to the other end; An inner clamp (2), the inner clamp (2) comprising three clamp pieces (21) of the same shape and size, the inner clamp (2) forming an inverted truncated cone structure with a hollow interior, and the outer circumference of the inner clamp (2) matches the inner circumference of the outer shell (1) so that the inner clamp (2) can be accommodated in the outer shell (1); the inner hollow interior of the inner clamp (2) is used to accommodate the steel wire rope (200); The inner hollow of the inner clamp (2) includes a first part (22) and a second part (23), one end of the first part (22) extends to the large end of the inner clamp (2) so that one end of the first part (22) is open, the other end of the first part (22) is connected to the second part (23), the second part (23) is formed as a truncated cone-shaped cavity, and the large end of the second part (23) extends to the small end of the inner clamp (2) so that the large end of the second part (23) is open, and the small end of the second part (23) is connected to the first part (22).
2. The clamp for breaking tensile test of steel wire rope according to claim 1, characterized in that: The outer shell (1) comprises a first end (11) and a second end (12) which are arranged opposite to each other, and the inner diameter corresponding to the second end (12) is smaller than the inner diameter corresponding to the first end (11); The end surface of the second end (12) is formed as an annular curved surface (121), and the annular curved surface (121) includes a first annular edge (1211) arranged on the outside and a second annular edge (1212) arranged on the inside, and the height of the second end (12) gradually increases in the direction from the first annular edge (1211) to the second annular edge (1212).
3. The clamp for breaking tensile test of steel wire rope according to claim 1, characterized in that: The length of the inner clamp (2) is greater than the length of the outer shell (1), so that the small end of the inner clamp (2) at least partially protrudes from the outer shell (1).
4. The clamp for breaking tensile test of steel wire rope according to claim 1, characterized in that: The inner clamp (2) further comprises a plurality of friction strips (24), wherein the plurality of friction strips (24) are arranged at intervals on the first portion (22) along the axial direction of the inner clamp (2).
5. The clamp for breaking tensile test of steel wire rope according to claim 4, characterized in that: The friction strip (24) is configured as an annular structure.
6. The clamp for breaking tensile test of steel wire rope according to claim 1, characterized in that: The first part (22) is formed as a truncated cone-shaped cavity, the large end of the first part (22) extends to the large end of the inner clamp (2), and the small end of the second part (23) is connected to the small end of the second part (23).
7. The clamp for breaking tensile test of steel wire rope according to claim 6, characterized in that: The diameter of the large end of the first part (22) is 10 mm, and the diameter of the small end of the first part (22) is 8 mm; or, The diameter of the large end of the first part (22) is 12 mm, and the diameter of the small end of the first part (22) is 10 mm.
8. The clamp for breaking tensile test of steel wire rope according to claim 1, characterized in that: The inner clamp (2) further comprises a buckle groove (25) and an elastic buckle strip (26); the buckle groove (25) is arranged in an annular shape and is formed on the outer peripheral surface of the large end of the inner clamp (2); the buckle groove (25) is used to accommodate the elastic buckle strip (26).
9. The clamp for breaking tensile test of steel wire rope according to claim 8, characterized in that: The cross section of the buckle groove (25) is formed into a semicircular shape.
10. The clamp for breaking tension test of steel wire rope according to claim 1, characterized in that: The outer diameter of the outer shell (1) is 60 mm to 70 mm, the length of the outer shell (1) is 60 mm to 80 mm, the angle A between the inner surface and the outer surface of the outer shell (1) satisfies: 6°≤A≤9°, and the maximum inner diameter R of the outer shell (1) is max Meet 35mm≤R max ≤45mm, the minimum inner diameter R of the outer shell (1) min Meet 20mm≤R min ≤30mm; The maximum outer diameter of the inner clamp (2) is 30 mm to 50 mm, the minimum outer diameter of the inner clamp (2) is 15 mm to 25 mm, and the length of the inner clamp (2) is 70 mm to 90 mm.