Clamp suitable for tension test of thin steel wire
By designing the whistle-shaped clamp block and winding wheel structure, combined with the anti-slip texture design of the locking screw and handle, the problems of unstable and large losses of the clamp in the tensile test of fine-spec steel wire are solved, and stable clamping, low-cost and high-efficiency test are achieved .
Patent Information
- Application Number
- CN202420375089.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The existing fine-specification wire tensile test fixtures have problems such as the sample clamp is not tight, easy to slip, large jaw sheet loss, high cost and low test efficiency.
A whistle-shaped clamp block consisting of long strips, transitions and disk areas is designed, and the steel wire is fixed by winding wheels and locking screws, and the strip-shaped anti-slip lines and handles of the upper and lower ring clips are used. The pressure effect ensures that the steel wire does not slip and achieves rapid disassembly and assembly and multiple uses through thread combination.
It realizes stable clamping of fine-sized steel wires, reduces jaw clip losses, extends service life, reduces costs, and improves test efficiency and simplicity of operation.
Smart Images
Figure CN222144703U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a mechanical test fixture, in particular to a fixture suitable for conducting tension tests on thin-gauge steel wires, in particular to thin-gauge steel wires with a size of ≤φ3.0 mm. Background Art
[0002] In the metal products industry, the tensile testing machine is one of the most common mechanical testing equipment. With the help of the tensile testing machine, the material can be tested and inspected for mechanical properties such as static load, stretching, compression, bending, shearing, and peeling. The tensile testing machine needs to clamp the sample through the fixture to transmit force to test the mechanical properties. Due to the various shapes of the test samples and the variety of sample materials, it is necessary to have a variety of corresponding fixtures with different shapes, specifications and materials for mechanical experiments and inspections. At present, when the tensile test is performed on the thin-gauge steel wire commonly used in metal products, the clamps used are wedge clamps and winding clamps. The jaws generally have V-grooved jaws or flat jaws. The steel wire is tightened by two jaws for testing. However, in the process of long-term and high-frequency tensile testing of thin-gauge steel wires, some defects that need to be improved and perfected are also exposed: for example, the sample is not clamped tightly, the sample is easy to slip, the sample jaws are broken, the jaws are lost, the cost is high, and the test efficiency is low. Therefore, it is necessary to design a clamp that can solve the above technical problems and is suitable for tensile testing of thin-gauge steel wires. Summary of the invention
[0003] The purpose of the utility model is to provide a clamp suitable for tensile testing of fine-gauge steel wires in order to address the deficiencies in the above-mentioned prior art. The utility model can meet the requirements of tensile testing of fine-gauge steel wires. The utility model can firmly clamp the sample to ensure that the sample does not slip during the tensile test. The jaws have low wear and tear, long life, and low cost. It has the characteristics of firm clamping, simple operation, high test efficiency, and low test cost. It is an innovation and improvement of the tensile test clamp for fine-gauge steel wires.
[0004] The purpose of this utility model can be achieved through the following technical measures:
[0005] The utility model is a clamp suitable for tensile testing of thin-gauge steel wires, comprising a whistle-shaped clamp block which is composed of a long strip section, a transition section and a disc area in sequence (the clamp block is both the installation basis of other parts in the utility model and the force transmission component between the tensile testing machine, the winding wheel and the steel wire), a winding wheel fixed in the disc area in a coaxial manner near the end of the long strip section (used to change the stretching direction and force direction of the steel wire, and the large arc surface of the winding wheel is used as a transition to reduce the slippage of the steel wire), a locking screw fixed in the disc area at the end opposite to the winding wheel (serving as the installation basis of the upper annular clamp, the lower annular clamp and the handle, and also the rotating shaft of the handle), an upper annular clamp and a lower annular clamp for clamping the steel wire ( The two surfaces with strip-shaped anti-skid patterns at the proximal ends of the upper annular clamp and the lower annular clamp, together with the surface of the locking screw, form an embedding groove for embedding the steel wire. The pressure of the handle can stably compress the steel wire to meet the requirements of tensile testing of fine-gauge steel wire; since the clamping area of the upper annular clamp and the lower annular clamp is large, the loss during use is small, and the two surfaces with strip-shaped anti-skid patterns can be interchangeable, so the service life of the upper annular clamp and the lower annular clamp is long; in addition, the upper annular clamp and the lower annular clamp have a simple structure and low cost), and a handle for compressing the upper annular clamp, which is mounted on the locking screw in a threaded manner (the handle can be rotated to adjust the height of the upper annular clamp, that is, to adjust the width of the embedding groove for embedding the steel wire, which can On the one hand, it can flexibly compress the steel wire, and on the other hand, it can be used for testing a variety of fine specifications of steel wires, with the advantages of wide application range and flexible operation); the thickness of the long strip section and the transition section in the fixture block are equal, and both are greater than the thickness of the disc area (because the long strip section is directly connected to the tensile testing machine, the thickness of the long strip section and the transition section is larger, which is conducive to force and stable force transmission. At the same time, the thickness of the transition section is greater than the thickness of the disc area, and a spare safety protection area will be formed between the wheel groove of the winding wheel and the transition section to prevent the steel wire end from directly popping out and injuring people), and a transition arc is processed on the outer surface of the transition section (to make the lines of the product contour smooth and beautiful); the winding wheel is firstly milled off the lower part along the chord plane below with a cylindrical disc as the processing base to obtain a large part with a central angle greater than 180 degrees The disc is then milled away along the contour surface of the large semi-circular disc to form an integral structure consisting of a rim and a groove (the large semi-circular disc structure is to reduce the volume and reserve necessary installation positions for the locking screw, handle, upper annular clamp and lower annular clamp; the rim and groove structure is to safely wind the steel wire and change the stretching direction and force direction of the steel wire); radially extending strip anti-skid patterns are provided on the upper and lower surfaces of the upper annular clamp and the lower annular clamp (the provision of strip anti-skid patterns facilitates more stable compression of the steel wire and prevents the steel wire from slipping; at the same time, both surfaces of the upper annular clamp and the lower annular clamp are provided with strip anti-skid patterns, and when one working surface is worn, the other surface can be turned over as a new working surface, which greatly extends the service life of the utility model).
[0006] In the utility model, a concave arc surface coaxial with the locking screw is processed at the center position of the lower chord plane of the winding wheel, and the arc radius of the concave arc surface is larger than the radius of the handle, the upper annular clip and the lower annular clip (to avoid interference between the upper annular clip, the lower annular clip and the handle during installation and movement).
[0007] In the utility model, the outer surface of the locking screw is processed with an external thread, and the inner hole surface of the handle and the inner hole surface of the lower annular clamp are processed with internal threads matching the external thread of the locking screw (through the threaded combination, on the one hand, the handle and the locking screw, the lower annular clamp and the locking screw can be quickly connected and fixed, and on the other hand, it is convenient for rapid disassembly and repeated use, and it is also convenient for one working surface of the lower annular clamp to be quickly turned over after being worn and the other surface can be used as a new working surface, which greatly extends the service life of the utility model).
[0008] The fixture block described in the utility model is made of alloy steel with excellent impact resistance and toughness after quenching and tempering (ensuring stable transmission of the tensile force from the tensile testing machine to the winding wheel and the steel wire).
[0009] The surface of the wheel groove in the utility model is formed by flame powder spraying self-fluxing alloy to form a high-hardness surface hard layer of HRC≥60 (effectively improving its service life).
[0010] The design principle of the utility model is as follows:
[0011] The clamp of the utility model adopts a winding structure - the front and rear ends of the steel wire to be tested are respectively wound from the same side of the front and rear clamps through the large arc surface of the wheel groove of each winding wheel and then wound into the corresponding mounting groove between the upper annular clamp and the lower annular clamp. The large arc surface transition can effectively reduce the slippage of the steel wire sample; at the same time, since the upper and lower surfaces of the upper annular clamp and the lower annular clamp are provided with strip anti-skid patterns, the pressure of the handle can stably press the steel wire to prevent the steel wire from slipping, meeting the requirements of tensile testing of fine-gauge steel wire. Since the clamping area of the upper annular clamp and the lower annular clamp is large, the loss during use is small, and the two surfaces provided with strip anti-skid patterns can be interchanged after wear, so the service life of the upper annular clamp and the lower annular clamp is long, which also greatly extends the service life of the utility model; in addition, the parts structure of the utility model is simple and easy to process, and it also has the advantages of low cost, easy operation and high test efficiency.
[0012] The beneficial technical effects of the utility model are as follows:
[0013] The utility model can meet the requirements for tensile testing of fine-gauge steel wires. The specimen can be firmly clamped by the utility model to ensure that the specimen does not slip during the tensile test. The jaws have low wear and tear, long service life and low cost. The utility model has the characteristics of firm clamping, simple operation, high test efficiency and low test cost. It is an innovation and improvement of the tensile test fixture for fine-gauge steel wires. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the use state of the utility model.
[0015] Figure 2 It is a structural schematic diagram of the utility model.
[0016] Figure 3 It is a schematic diagram of the structure of the upper annular clamp and the lower annular clamp.
[0017] Explanation of the serial numbers in the figure: 1. clamp block, 1-1. long strip section, 1-2. transition section, 1-3. disc area; 2. winding wheel, 2-1. wheel rim, 2-2. wheel groove, 2-3. concave arc surface; 3. locking screw; 4. handle; 5. upper annular clamping piece, 5-1. strip anti-slip pattern; 5', lower annular clamping piece; 6. steel wire. DETAILED DESCRIPTION
[0018] The utility model is further described below in conjunction with the accompanying drawings:
[0019] like Figure 1 to Figure 3As shown, the utility model is a clamp suitable for tensile testing of fine-gauge steel wires, comprising a whistle-shaped clamp block 1 which is composed of a long strip section 1-1, a transition section 1-2 and a disc area 1-3 in sequence (the clamp block 1 is both a mounting base for other components in the utility model and a force transmission component between the tensile testing machine and the winding wheel 2 and the steel wire 6), a winding wheel 2 fixed in a coaxial manner in the disc area near the end of the long strip section (used to change the stretching direction and force direction of the steel wire 6, and with the large arc surface of the winding wheel 2 as a transition, the slipping of the steel wire 6 can be reduced), a locking screw 3 fixed in the disc area at the end opposite to the winding wheel (serving as a mounting base for the upper annular clamp 5, the lower annular clamp 5' and the handle 4, and also as a rotation screw of the handle 4 Axis), an upper annular clamp 5 and a lower annular clamp 5' which are sleeved on the locking screw 3 and are used to clamp the steel wire 6 (the two surfaces with the strip anti-skid patterns 5-1 at the proximal ends of the upper annular clamp 5 and the lower annular clamp 5' and the surface of the locking screw 3 together form an embedding groove for embedding the steel wire 6, and the pressure of the handle 4 can stably compress the steel wire 6 to meet the requirements of tensile testing of fine-gauge steel wires; since the clamping area of the upper annular clamp 5 and the lower annular clamp 5' is large, the loss during use is small, and the two surfaces both provided with the strip anti-skid patterns 5-1 can be interchangeable, so the service life of the upper annular clamp 5 and the lower annular clamp 5' is long; in addition, the upper annular clamp 5 and the lower annular clamp 5' have a simple structure and low cost), are sleeved in a threaded combination manner. On the locking screw 3, there is a handle 4 for pressing the upper annular clamp 5 (rotating the handle 4 can adjust the height of the upper annular clamp 5, that is, adjust the width of the embedding groove for embedding the steel wire 6. On the one hand, it can flexibly press the steel wire 6, and on the other hand, it can be used for testing a variety of fine-gauge steel wires, with the advantages of wide application range and flexible operation); the thickness of the long strip section 1-1 and the transition section 1-2 in the clamp block 1 is equal, and both are greater than the thickness of the disc area 1-3 (because the long strip section 1-1 is the part directly connected to the tensile testing machine, the thickness of the long strip section 1-1 and the transition section 1-2 is larger, which is conducive to force and stable force transmission. At the same time, the thickness of the transition section 1-2 is greater than the thickness of the disc area 1-3, which will be between the wheel groove 2-2 of the winding wheel 2 and the transition section 1 -2 forms a spare safety protection zone to prevent the end of the steel wire 6 from directly popping out and injuring people), and a transition arc is processed on the outer surface of the transition section 1-2 (to make the product contour lines smooth and beautiful); the winding wheel 2 is firstly milled off the lower part along the chord plane below with a cylindrical disk as the processing base to obtain a large semi-circular disk with a central angle greater than 180 degrees, and then part of the thickness is milled off along the contour surface of the large semi-circular disk to form an integral structure composed of a rim 2-1 and a wheel groove 2-2 (the large semi-circular disk structure is to reduce the volume and reserve the necessary installation position for the locking screw 3, the handle 4, the upper annular clamp 5 and the lower annular clamp 5'; the rim 2-1 and the wheel groove 2-2 structure are for safely winding the steel wire 6 and changing the stretching direction and force direction of the steel wire 6);The upper and lower surfaces of the upper annular clamping piece 5 and the lower annular clamping piece 5' are provided with strip-shaped anti-skid patterns 5-1 extending in the radial direction (the provision of the strip-shaped anti-skid patterns 5-1 facilitates more stable compression of the steel wire 6 and prevents the steel wire 6 from slipping; at the same time, the two surfaces of the upper annular clamping piece 5 and the lower annular clamping piece 5' are provided with strip-shaped anti-skid patterns 5-1, and when one working surface is worn, the other surface can be turned over as a new working surface, which greatly prolongs the service life of the utility model). ;
[0020] In the utility model, a concave arc surface 2-3 coaxial with the locking screw 3 is processed at the center position of the lower chord plane of the winding wheel 2, and the arc radius of the concave arc surface 2-3 is larger than the radius of the handle 4, the upper annular clip 5 and the lower annular clip 5' (to avoid interference between the upper annular clip 5, the lower annular clip 5' and the handle 4 during installation and movement).
[0021] In the utility model, the outer surface of the locking screw 3 is processed with an external thread, and the inner hole surface of the handle 4 and the inner hole surface of the lower annular clamp 5' are processed with internal threads matching the external thread of the locking screw (through the threaded combination, on the one hand, the handle 4 and the locking screw 3, the lower annular clamp 5' and the locking screw 3 can be quickly connected and fixed, on the other hand, it is convenient for rapid disassembly and repeated use, and it is also convenient for one working surface of the lower annular clamp 5' to be quickly turned over after being worn and the other surface is used as a new working surface, which greatly extends the service life of the utility model).
[0022] The fixture block 1 in the present invention is made of alloy steel having excellent impact resistance and toughness after quenching and tempering (ensuring stable transmission of the tensile force from the tensile testing machine to the winding wheel 2 and the steel wire 6).
[0023] The surface of the wheel groove 2-2 in the utility model is formed by flame powder spraying self-fluxing alloy to form a high hardness surface hard layer of HRC≥60 (effectively improving its service life).
[0024] The specific usage of this utility model is as follows:
[0025] First, assemble two symmetrical fixtures of the utility model according to the above structural description and the positional relationship shown in the attached drawings. Then, place the two fixtures symmetrically front and back. Next, the front and rear ends of the steel wire 6 to be tested are respectively wound around the large arc surface of the wheel groove 2-2 of each winding wheel 2 from the same side of the front and rear fixtures, and then wound into the corresponding embedding grooves between the upper annular clamp 5 and the lower annular clamp 5', and wound along the embedding grooves. Then, rotate the handle 4 to drive the upper annular clamp 5 to move downward until the steel wire 6 is stably pressed by the two working surfaces with strip-shaped anti-skid patterns 5-1 of the upper annular clamp 5 and the lower annular clamp 5', that is, the steel wire 6 will not slip. Next, connect the long strip segments 1-1 of the fixture blocks 1 in the two fixtures to the corresponding parts of the tensile testing machine, and turn on the tensile testing machine to perform a tensile test on the thin-gauge steel wire 6.
Claims
1. A clamp suitable for tensile testing of fine-gauge steel wires, characterized in that: The clamp comprises a clamp block (1) which is composed of a long strip section (1-1), a transition section (1-2) and a disc area (1-3) in sequence and is in the shape of a whistle as a whole; a winding wheel (2) fixed in a coaxial manner in the disc area near the end of the long strip section; a locking screw (3) fixed in the disc area at the end opposite to the winding wheel; an upper annular clamp (5) and a lower annular clamp (5') mounted on the locking screw (3) for clamping a steel wire (6); and a handle (4) mounted on the locking screw (3) in a threaded manner for pressing the upper annular clamp (5); the long strip section (1-1) in the clamp block (1) is connected to the handle (4) by a threaded connection; the winding wheel (2) is fixed in the disc area near the end of the long strip section in a coaxial manner; a locking screw (3) is fixed at the end opposite to the winding wheel; an upper annular clamp (5) and a lower annular clamp (5') are mounted on the locking screw (3) for clamping the steel wire (6); and The thickness of the transition section (1-1) is equal to that of the transition section (1-2) and is greater than that of the disc area (1-3); a transition arc is processed on the outer surface of the transition section (1-2); the winding wheel (2) is firstly milled off the lower part along the chord plane below using the cylindrical disc as the processing base to obtain a large semi-circular disc with a central angle greater than 180 degrees, and then a part of the thickness is milled off along the contour surface of the large semi-circular disc to form an integral structure consisting of a wheel rim (2-1) and a wheel groove (2-2); and strip-shaped anti-slip patterns (5-1) extending in the radial direction are arranged on the upper and lower surfaces of the upper annular clamping piece (5) and the lower annular clamping piece (5').
2. A clamp suitable for tensile testing of thin gauge steel wire according to claim 1, characterized in that: A concave arc surface (2-3) coaxial with the locking screw (3) is machined at the center position of the chord plane below the winding wheel (2), and the arc radius of the concave arc surface (2-3) is greater than the radius of the handle (4), the upper annular clamping piece (5) and the lower annular clamping piece (5').
3. A clamp suitable for tensile testing of fine-gauge steel wire according to claim 1, characterized in that: An external thread is machined on the outer surface of the locking screw (3), and an internal thread matching the external thread of the locking screw is machined on the inner hole surface of the handle (4) and the inner hole surface of the lower annular clamp (5').
4. A clamp suitable for tensile testing of thin gauge steel wire according to claim 1, characterized in that: The clamp block (1) is made of alloy steel that has been quenched and tempered and has excellent impact resistance and toughness.
5. A clamp suitable for tensile testing of thin gauge steel wire according to claim 1, characterized in that: The surface of the wheel groove (2-2) is a high-hardness surface hard layer with HRC ≥ 60 formed by flame powder spraying of self-fluxing alloy.