Steel strand relaxation-deflection tensile testing machine

By designing a steel strand slack-deflection tensile testing machine containing an anchoring mechanism, the shortcomings of existing equipment in terms of testing accuracy, frame rigidity and operational convenience are solved, and more efficient and accurate steel strands are achieved. Performance evaluation meets the updated standard requirements.

CN119290573APending Publication Date: 2025-01-10NANNING JIANXIE ENG INSPECTION CO LTD
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Patent Information

Application Number
CN202411214450.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-31
Publication Date
2025-01-10

AI Technical Summary

Technical Problem

The existing steel strand slack-deflected tensile testing machines have shortcomings in testing accuracy, frame rigidity, anchor design and operational convenience, and cannot effectively meet the updated national standards and industry standards requirements, resulting in inaccurate test results. And inefficient.

Method used

A steel strand relaxation-deflection tensile testing machine including a test bench, an axial loading mechanism, a deflection frame, a clamping adjustment seat and an anchoring mechanism is designed, and an anchoring mechanism is used to use wedge blocks, clamping blocks and tightening parts. The components are firmly clamped to ensure the firm fixation of the steel strand during the test, avoid sliding, and improve the test accuracy and efficiency through one-way moving structure and wear-resistant materials.

Benefits of technology

It achieves high accuracy and efficiency of strand slack and oblique tensile tests, meets the current and future engineering quality inspection needs, provides more reliable data support, and ensures the accuracy and stability of test results.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a steel strand relaxation-deflection tensile testing machine, and relates to the technical field of steel strand testing. Comprising a test bed, an axial loading mechanism, a deflection frame, a clamping adjusting seat, an anchoring mechanism and a test control unit, the axial loading mechanism, the deflection frame and the clamping adjusting seat are sequentially arranged on the test bed, the anchoring mechanisms are respectively arranged on the axial loading mechanism and the clamping adjusting seat, and a steel strand to be tested is arranged between the two anchoring mechanisms and bypasses the deflection frame; the anchoring mechanism comprises a seat body, a side cover plate, a wedge-shaped block, a first clamping block, a second clamping block, a guide rod, a clamping piece and a tightening piece, the front end of the seat body is of a conical structure, a clamping chamber is arranged in the seat body, the clamping chamber is of a conical structure corresponding to the front end of the seat body, the clamping chamber communicates with a communicating hole located in the front end of the seat body, and the communicating hole is of a conical structure and used for containing the clamping piece. According to the invention, the relaxation test and the deflection tensile test of the steel strand can be respectively and accurately carried out; the anchoring mechanism is convenient to clamp, stable in clamping and capable of preventing the steel strand from sliding.
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Description

Technical Field

[0001] The invention relates to the technical field of steel strand testing, in particular to a steel strand relaxation-deflection tensile testing machine. Background Art

[0002] As an important building material, steel strand is widely used in bridges, buildings, water conservancy projects and other projects, and its quality directly affects the safety of the project. Therefore, it is of great significance to conduct relaxation and deflection tensile tests on steel strands, which can evaluate their stability under long-term loads and their tensile properties under deflection force. Although the existing steel strand relaxation testers and deflection tensile testers meet the testing needs to a certain extent, there are still some limitations. For example, some equipment may not be able to effectively avoid the relaxation of the structural frame during relaxation tests, affecting the accuracy of the test results; and when conducting deflection tensile tests, clamping is inconvenient and the anchor design may be unreasonable, resulting in low test efficiency and failure to meet the requirements of updated national standards and industry standards.

[0003] In view of the shortcomings of existing technologies, it is necessary to develop a new type of steel strand relaxation-deflection tensile testing machine, which should have higher test accuracy, stronger frame rigidity, more reasonable anchor design, and simpler operation. Such equipment will be able to provide more accurate and reliable test results, improve test efficiency, and meet the current and future needs of engineering quality inspection. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a steel strand relaxation-deflection tensile testing machine, which can accurately perform steel strand relaxation test and deflection tensile test respectively. At the same time, it provides an anchoring mechanism that is convenient to clamp, firmly clamp, and prevents the steel strand from sliding, providing accurate data support for the performance evaluation of the steel strand in different engineering applications.

[0005] The specific technical solutions are as follows:

[0006] A steel strand relaxation-deflection tensile testing machine comprises a test bench, an axial loading mechanism, a deflection frame, a clamping adjustment seat, an anchoring mechanism and a test control unit; the test bench is provided with an axial loading mechanism, a deflection frame and a clamping adjustment seat in sequence, the anchoring mechanism is respectively arranged on the axial loading mechanism and the clamping adjustment seat, and the steel strand to be tested is installed between the two anchoring mechanisms and bypasses the deflection frame; the anchoring mechanism comprises a seat body, a side cover plate, a wedge block, a first clamping block, a second clamping block, a guide rod, a clamp and a tightening member, the front end of the seat body is a conical structure, a clamping chamber is arranged in the seat body, the clamping chamber corresponds to the conical structure of the front end of the seat body, and the clamping chamber is connected to a connecting hole located at the front end of the seat body , the connecting hole is a conical structure for placing the clamp; the wedge block is placed in the clamping chamber, the smaller end of the wedge block corresponds to the connecting hole, and the larger end of the wedge block is provided with a semicircular arc groove for the steel strand to be tested to surround; the first clamping block and the second clamping block are respectively arranged on both sides of the conical structure of the clamping chamber, and are used to form a wedge-shaped clamp on the steel strand to be tested with the wedge block; the first clamping block has an arc-shaped transition at one end corresponding to the connecting hole, which is used to transition the steel strand to be tested to the guide hole at the front end of the seat body; the tightening piece is arranged on the outer side of the seat body corresponding to the guide hole, which is used to tighten and fix the end of the steel strand to be tested; the guide rod is slidably arranged at the rear end of the seat body and connected to the wedge block.

[0007] Furthermore, in the above scheme, the tightening member includes a fixing plate, a tightening rod and a tightening nut, one end of the tightening rod is provided with a mounting hole, and the other end is provided with a thread, the tightening rod passes through the fixing plate and is connected to the tightening nut.

[0008] Furthermore, in the above solution, the guide rod and the seat body are provided with a one-way movement structure, including a spring sheet arranged on the seat body and a beveled tooth arranged on the guide rod corresponding to the spring sheet, so as to form a one-way movement.

[0009] In the above solution, the seat body is provided with a pull rod for pulling the spring piece so that the spring piece is separated from the bevel teeth.

[0010] Furthermore, in the above scheme, the axial loading mechanism and the clamping adjustment seat are both rotatably connected to the test bench to achieve deflection at different angles.

[0011] The above scheme is further characterized in that: a dovetail groove is provided on the side of the cover plate opposite to the clamping chamber in the seat body, and the wedge block is provided with a protrusion corresponding to the dovetail groove.

[0012] In the above scheme, the seat body is a box structure, the rear end of which is a rectangular structure, and the front end is an isosceles trapezoidal structure.

[0013] Furthermore, in the above scheme, the inner surface of the semicircular arc groove of the wedge-shaped block is coated with a wear-resistant material to reduce the wear of the steel strand during the winding process.

[0014] Furthermore, in the above scheme, the clamping chamber is provided with two symmetrically arranged guide pulleys near the connecting hole, and the two guide pulleys form a guide channel for the steel strand to be tested to pass through, and the guide channel is directly opposite to the connecting hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention can accurately carry out the steel strand relaxation test and the deflection tensile test, effectively avoid the relaxation phenomenon of the steel strand, ensure the accuracy of the test results, and provide reliable data for evaluating the stability of the steel strand under long-term load. Through the design of the anchoring mechanism, the steel strand is firmly clamped, avoiding the error caused by unstable clamping, and greatly improving the accuracy of the relaxation test and the deflection tensile test.

[0017] The test machine of the present invention is convenient and quick to clamp; its anchoring mechanism makes the installation process of the steel strand smoother and improves the test efficiency. At the same time, the reasonable anchor design ensures the stable clamping of the steel strand when it is subjected to deflection force, and can accurately test its tensile performance, meeting the requirements of the updated national standards and industry standards.

[0018] The anchoring mechanism provided by the present invention has a stable clamping and avoids the steel strand from sliding during the test. The wedge block, the first clamping block and the second clamping block cooperate to form a double clamping, the clamping piece forms a third clamping, and the guide hole and the tightening piece form a fourth clamping, which together ensure the firm fixation of the steel strand and provide a solid guarantee for the smooth progress of the test.

[0019] The present invention adopts a design of opening the clamping chamber with a side cover plate, which can install the steel strand faster and more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the invented steel strand deflection tensile test;

[0021] Figure 2 It is a schematic diagram of the structure of the invented steel strand relaxation test;

[0022] Figure 3 It is a three-dimensional structural diagram of the anchoring mechanism of the invention;

[0023] Figure 4 yes Figure 3 Structural cross-section view;

[0024] Figure 5 yes Figure 3 Another structural cross-sectional view.

[0025] In the accompanying drawings, 1-test bench, 2-axial loading mechanism, 3-deflection frame, 4-clamping adjustment seat, 5-anchoring mechanism, 6-steel strand, 7-seat body, 8-side cover plate, 9-wedge block, 10-guide rod, 11-clamp, 12-tightening member, 13-clamping chamber, 14-connecting hole, 15-guide hole, 16-fixing plate, 17-tightening rod, 18-tightening nut, 19-dovetail groove, 20-guide pulley, 21-observation port, 22-first clamping block, 23-second clamping block. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the embodiments of the invention in conjunction with the accompanying drawings to make the objectives, technical solutions and technical effects of the invention more clearly presented.

[0027] like Figure 1-Figure 4 As shown, the present invention discloses a steel strand relaxation-deflection tensile testing machine, comprising a test bench 1, an axial loading mechanism 2, a deflection frame 3, a clamping adjustment seat 4, an anchoring mechanism 5 and a test control unit; the test bench 1 is sequentially provided with the axial loading mechanism 2, the deflection frame 3 and the clamping adjustment seat 4, the anchoring mechanism 5 is respectively arranged on the axial loading mechanism 2 and the clamping adjustment seat 4, and the steel strand 6 to be tested is installed between the two anchoring mechanisms 5 and bypasses the deflection frame 3. The axial loading mechanism 2 and the clamping adjustment seat 4 are both rotatably connected to the test bench 1 to achieve deflection at different angles. In this way, it is possible to carry out steel strand relaxation tests and deflection tensile tests, specifically: Figure 1 This is a schematic diagram of the structure of the steel strand deflection tensile test; Figure 2 It is a schematic diagram of the steel strand relaxation test structure.

[0028] like Figure 3-4As shown, the anchoring mechanism 5 includes a seat body 7, a side cover plate 8, a wedge block 9, a first clamping block 22, a second clamping block 23, a guide rod 10, a clamp 11 and a tightening member 12. The front end of the seat body 7 is a conical structure, and a clamping chamber 13 is provided in the seat body 7. The clamping chamber 13 corresponds to the conical structure of the front end of the seat body 7. The seat body 7 is a box structure, and its rear end is a rectangular structure, and its front end is an isosceles trapezoidal structure. The clamping chamber 13 is connected to the connecting hole 14 located at the front end of the seat body 7. The connecting hole 14 is a conical structure for placing the clamp 11. The wedge block 9 is placed in the clamping chamber 13, and the smaller end of the wedge block 9 corresponds to the connecting hole 14. The larger end of the wedge block 9 is provided with a semicircular arc groove for surrounding the steel strand 6 to be tested. The first clamping block 22 and the second clamping block 23 are respectively arranged on both sides of the conical structure of the clamping chamber 13, and are used to form a wedge-shaped clamping of the steel strand 6 to be tested with the wedge-shaped block 9. The first clamping block 22 has an arc transition at one end corresponding to the connecting hole 14, and is used to transition and guide the steel strand 6 to be tested to the guide hole 15 at the front end of the seat body 7. The tightening member 12 is arranged on the outer side of the seat body 7 corresponding to the guide hole 15, and is used to tighten and fix the end of the steel strand 6 to be tested; the guide rod 10 is slidably arranged at the rear end of the seat body 7 and connected to the wedge-shaped block 9.

[0029] Here, the tightening member 12 includes a fixing plate 16 , a tightening rod 17 and a tightening nut 18 . The tightening rod 17 is provided with a mounting hole at one end and a thread at the other end. The tightening rod 17 passes through the fixing plate 16 and is connected to the tightening nut 18 .

[0030] The guide rod 10 and the seat body 7 are provided with a one-way moving structure, including a spring sheet arranged on the seat body 7 and a beveled tooth arranged on the guide rod 10 corresponding to the spring sheet, so as to form a one-way movement; this makes the problem of structural looseness appear during clamping. A pull rod for pulling the spring sheet is provided on the seat body 7, so that the spring sheet is separated from the beveled tooth, which is convenient for disassembly and movement.

[0031] A dovetail groove 19 is provided on the side of the clamping chamber 13 in the seat body 7 opposite to the side cover plate 8, and the wedge block 9 is provided with a protrusion corresponding to the dovetail groove 19, which further ensures that the wedge block 9 will not deviate and ensures the clamping effect with the first clamping block 22 and the second clamping block 23. The first clamping block 22 and the second clamping block 23 can be installed by bolts, and grooves corresponding to the steel strand 6 to be tested can also be provided to further enhance the clamping effect. The inner surface of the semicircular arc groove of the wedge block 9 is coated with wear-resistant material to reduce the wear of the steel strand 6 during the winding process.

[0032] like Figure 5 As shown, the clamping chamber 13 is provided with two symmetrically arranged guide pulleys 20 near the connecting hole 14, and the two guide pulleys 20 form a guide channel for the steel strand 6 to be tested, and the guide channel is directly opposite to the connecting hole 14. Here, the clamp 11 can be matched, and it can also be used when the clamp 11 is missing.

[0033] During operation, the steel strand 6 is first installed on the anchor mechanism 5 and adjusted to a suitable tensioning state. A specific tensile force is applied and maintained through the axial loading mechanism 2, and the stress change of the steel strand 6 over a period of time is recorded using the test control unit. For the deflection tensile test, after the installation of the steel strand 6 is completed, the axial loading mechanism 2 and the clamping adjustment seat 4 are rotated to the required angle, and the deflection frame 3, and then a tensile force is applied, and the tensile performance data of the steel strand 6 in the deflected state is recorded. When installing the steel strand 6, the side panel 8 of the anchor mechanism 5 is used to open the installation structure to facilitate the installation of the steel strand 6. The first clamping block 22, the second clamping block 23, the tightening piece 12, and the wedge-shaped clamping structure are used to ensure that the steel strand 6 is firmly clamped to avoid slipping during the test.

[0034] The above description is only a preferred feasible embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. All equivalent changes, equivalent substitutions or modified changes performed within the technical spirit and principles suggested by the present invention should be included in the scope of patent protection covered by the present invention.

Claims

1. A steel strand relaxation-deflection tensile testing machine, comprising a test bench, an axial loading mechanism, a deflection frame, a clamping adjustment seat, an anchoring mechanism and a test control unit; the test bench is provided with an axial loading mechanism, a deflection frame and a clamping adjustment seat in sequence, the anchoring mechanism is respectively arranged on the axial loading mechanism and the clamping adjustment seat, and the steel strand to be tested is installed between the two anchoring mechanisms and bypasses the deflection frame; it is characterized in that: The anchoring mechanism comprises a seat body, a side cover plate, a wedge block, a first clamping block, a second clamping block, a guide rod, a clamp and a tightening member. The front end of the seat body is a conical structure, and a clamping chamber is provided in the seat body. The clamping chamber corresponds to the conical structure of the front end of the seat body. The clamping chamber is connected to a connecting hole located at the front end of the seat body. The connecting hole is a conical structure and is used to place the clamp; the wedge block is placed in the clamping chamber, the smaller end of the wedge block corresponds to the connecting hole, and the larger end of the wedge block is provided with a connecting hole for the steel strand to be tested. A surrounding semicircular arc groove; the first clamping block and the second clamping block are respectively arranged on both sides of the conical structure of the clamping chamber, and are used to form a wedge-shaped clamp on the steel strand to be tested with the wedge-shaped block; the first clamping block has an arc-shaped transition at one end corresponding to the connecting hole, which is used to transition the steel strand to be tested to the guide hole at the front end of the seat body; the tightening piece is arranged on the outer side of the seat body corresponding to the guide hole, which is used to tighten and fix the end of the steel strand to be tested; the guide rod is slidably arranged at the rear end of the seat body and connected to the wedge-shaped block.

2. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: The tightening member comprises a fixing plate, a tightening rod and a tightening nut. A mounting hole is arranged at one end of the tightening rod and a thread is arranged at the other end. The tightening rod passes through the fixing plate and is connected to the tightening nut.

3. The steel strand relaxation-deflection tensile testing machine according to claim 2, characterized in that: The fixing plate is provided with a length scale.

4. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: The guide rod and the seat body are provided with a one-way movement structure, including a spring sheet arranged on the seat body and a beveled tooth arranged on the guide rod corresponding to the spring sheet, so as to form a one-way movement.

5. The steel strand relaxation-deflection tensile testing machine according to claim 4, characterized in that: The seat body is provided with a pull rod for pulling the spring piece so that the spring piece is separated from the bevel cutting teeth.

6. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: The axial loading mechanism and the clamping adjustment seat are both rotatably connected to the test bench to achieve deflection at different angles.

7. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: A dovetail groove is provided on one side of the cover plate opposite to the clamping chamber in the seat body, and a protrusion corresponding to the dovetail groove is provided on the wedge block.

8. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: The seat body is in a box structure, the rear end of which is a rectangular structure, and the front end of which is an isosceles trapezoidal structure.

9. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: The inner surface of the semicircular arc groove of the wedge-shaped block is coated with wear-resistant material to reduce the wear of the steel strand during the winding process.

10. The steel strand relaxation-deflection tensile testing machine according to claim 1, characterized in that: The clamping chamber is provided with two symmetrically arranged guide pulleys near the connecting hole, and the two guide pulleys form a guide channel for the steel strand to be tested to pass through, and the guide channel is directly opposite to the connecting hole.