A tensile strength detection device for copper-coated monofilament wire

Abstract

This application proposes a tensile strength testing device for copper-clad steel monofilament wire. Both the fixed and movable clamps include an outer sleeve with a conical inner cavity. A clamping assembly is installed within the conical inner cavity, comprising a conical roller and a conical rubber sleeve. The outer circumferential surface of the conical roller has an outer spiral groove, and the inner circumferential surface of the conical rubber sleeve has an inner spiral groove. The conical rubber sleeve is screwed onto the outer spiral groove via the inner spiral groove. An arc-shaped groove is present within the roller body of the conical roller. The inlet end of the arc-shaped groove axially penetrates the small end of the conical roller, and the outlet end obliquely penetrates the bottom of the outer spiral groove. The cylinder of the hydraulic cylinder of the tensile device is fixed to a base, and the piston rod of the hydraulic cylinder is connected to the movable clamp via a tension sensor. This application utilizes the compressive force generated when the first and second conical rubber sleeves deform to fix both ends of the sample to the fixed and movable clamps respectively, thereby avoiding the problem of difficult-to-control compressive force when using clamp-type clamps in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment, specifically relating to a tensile strength testing device for copper-clad steel monofilament wire. Background Technology

[0002] Copper-clad steel wire combines the high strength of steel with the excellent conductivity and corrosion resistance of copper. It is primarily used in electrified railways, lightning protection grounding systems, communications, and electronic component leads. To ensure the quality of copper-clad steel wire, tensile strength testing equipment is required to determine its compliance. In addition to testing multi-strand wires composed of multiple copper-clad steel wires, testing of individual wires is also necessary. Clamping fixtures are commonly used. Since the typical diameter of a single copper-clad steel wire is 0.1-6mm, when clamping it, the sample's length within the clamp should be maximized to increase friction and prevent slippage during tensile testing. However, in practice, excessive pressure on the sample is difficult to control. Insufficient pressure will cause the sample to slip within the clamp, while excessive pressure will lead to deformation or even localized damage, resulting in fluctuations in the test data. Therefore, how to ensure that the sample is stably clamped on the fixture and avoid damage to the sample remains a problem that needs to be solved for small-diameter copper-clad steel wire fixtures. Utility Model Content

[0003] To address the problem that single copper-clad steel wires are difficult to clamp due to their small diameter in the prior art, this application proposes a tensile strength testing device for copper-clad steel monofilament wires, which includes a base, a fixed clamp, a movable clamp, and a tensile device mounted on the base. The fixed clamp, the movable clamp, and the tensile device are spaced apart along a first axis, wherein the tensile device is located on the side of the movable clamp away from the fixed clamp.

[0004] The clamping fixture includes a first outer sleeve fixed on a base, a first conical inner cavity inside the first outer sleeve, and a first clamping assembly installed in the first inner cavity. The first clamping assembly includes a first conical roller and a first conical rubber sleeve sleeved on the first conical roller. The outer peripheral surface of the first conical rubber sleeve is conical, and the taper of the outer peripheral surface of the first conical rubber sleeve is the same as the taper of the first inner cavity. A first outer spiral groove is provided on the outer peripheral surface of the first conical roller, and a first inner spiral groove is provided on the inner peripheral surface of the first conical rubber sleeve. The first conical rubber sleeve is screwed onto the first outer spiral groove via the first inner spiral groove.

[0005] The movable clamp includes a second outer sleeve movably mounted on a base, and a second conical inner cavity inside the second outer sleeve. A second clamping assembly is installed in the second inner cavity. The second clamping assembly includes a second conical roller and a second conical rubber sleeve sleeved on the second conical roller. The outer peripheral surface of the second conical rubber sleeve is conical, and the taper of the outer peripheral surface of the second conical rubber sleeve is the same as the taper of the second inner cavity. A second outer helical groove is provided on the outer peripheral surface of the second conical roller, and a second inner helical groove is provided on the inner peripheral surface of the second conical rubber sleeve. The second conical rubber sleeve is screwed onto the second outer helical groove via the second inner helical groove.

[0006] The first conical roller has a first arc-shaped groove inside the roller body. The inlet end of the first arc-shaped groove passes through the end face of the small end of the first conical roller along the axial direction, and the outlet end of the first arc-shaped groove passes through the bottom of the first outer spiral groove along the inclined direction. The outlet end of the first arc-shaped groove is located on one side of the small end of the first conical roller.

[0007] The second conical roller has a second arc-shaped groove inside the roller body. The inlet end of the second arc-shaped groove passes through the end face of the small end of the second conical roller along the axial direction, and the outlet end of the second arc-shaped groove passes through the bottom of the second outer spiral groove along the inclined direction. The outlet end of the second arc-shaped groove is located on one side of the small end of the second conical roller.

[0008] The small ends of the first inner cavity and the second inner cavity are positioned opposite each other;

[0009] The tensioning device includes a hydraulic cylinder, the cylinder barrel of which is fixed on a base, the piston rod of which extends toward the moving clamp, and a tension sensor is installed at the end of the piston rod. A connecting part is installed on the side of the tension sensor away from the hydraulic cylinder, and the connecting part is detachably installed on the second outer sleeve.

[0010] In this application, one end of the copper-clad steel monofilament sample to be tested is sequentially passed through the first conical rubber sleeve, through the first arc-shaped wire channel, and then out through the outlet, wound into the groove of the first outer spiral groove. Finally, the first conical rubber sleeve is screwed onto the first conical roller, and the screw threads of the first conical rubber sleeve press the sample against the screw groove of the first outer spiral groove. Then, the entire first clamping assembly is inserted into the first inner cavity of the first outer sleeve, causing the first conical rubber sleeve to deform and tightly press the sample into the first outer spiral groove, so that one end of the sample is mounted on the fixed clamp. Then, the other end of the sample is mounted on the movable clamp in the same manner. The connecting part is connected to the second outer sleeve, and then the hydraulic cylinder is activated to test the tensile strength of the sample. In this application, the extrusion force generated when the first and second conical rubber sleeves deform is used to fix both ends of the sample to the fixed clamp and the movable clamp respectively, thereby avoiding the problem of difficult control of the extrusion force when using clamp-type clamps in the prior art.

[0011] Furthermore, to avoid reduced testing accuracy due to slight deformation of the first and second conical rubber sleeves during the testing process, an end plate is installed at the opposite end of both the first and second outer sleeves, with a central hole on each end plate. Before testing, the first conical roller is pressed against the first end plate, and the second conical roller is pressed against the second end plate to prevent displacement during the testing process.

[0012] Furthermore, to facilitate the use of samples of different diameters, a first guide wire ring is screwed onto the small end of the first conical roller, with its guide wire hole coaxially aligned with the exit end of the first arc-shaped track; a second guide wire ring is screwed onto the small end of the second conical roller, with its guide wire hole coaxially aligned with the exit end of the second arc-shaped track. When it is necessary to change to samples with different outer diameters, the coaxiality of the sample with the first and second clamping assemblies can be improved by replacing the first and second guide wire rings with different hole diameters, thereby improving the detection accuracy.

[0013] Furthermore, to improve detection accuracy, the guide hole of the first guide ring is coaxially set with the guide hole of the second guide ring.

[0014] Furthermore, to improve the stability of the sample on the first and second clamping assemblies, a first locking hole is provided at the large end of the first conical roller, extending radially through the bottom of the first outer spiral groove. A first locking bolt is axially screwed onto the large end of the first conical roller, and the first locking bolt can extend into the first locking hole. Similarly, a second locking hole is provided at the large end of the second conical roller, extending radially through the bottom of the second outer spiral groove. A second locking bolt is axially screwed onto the large end of the second conical roller, and the second locking bolt can extend into the second locking hole. After the sample is wound onto the first and second conical rollers, both ends of the sample are inserted into the first and second locking holes, respectively. Then, the first and second locking bolts are used to lock both ends of the sample into the first and second locking holes, thereby improving the stability of the sample on the first and second clamping assemblies.

[0015] Furthermore, to facilitate the tight pressing of the first conical rubber sleeve against the inner wall of the first inner cavity, and the tight pressing of the second conical rubber sleeve against the inner wall of the second inner cavity, a first locking tube is screwed onto the large end of the inner cavity of the first outer sleeve, and the first locking tube presses against the end face of the large end of the first conical roller; a second locking tube is screwed onto the large end of the inner cavity of the second outer sleeve, and the second locking tube presses against the end face of the large end of the second conical roller. Screwing the first locking tube pushes the first clamping assembly toward the moving clamp, allowing the first conical rubber sleeve to press tightly against the inner wall of the first inner cavity and deform, thus pressing the sample wound in the first outer spiral groove. This keeps one end of the sample stably held on the first clamping assembly, and for the same effect, keeps the other end of the sample stably held on the second clamping assembly.

[0016] Furthermore, the two ends of the internally threaded tube are respectively screwed onto the outer circumferential surfaces of the connecting part and the second outer sleeve, so that the connecting part can be detachably installed on the second outer sleeve. The above structure allows the connecting part to be detachably installed on the second outer sleeve, so as to facilitate the disassembly of the second clamping assembly inside the second outer sleeve, and to facilitate the fixing of the copper-clad steel monofilament wire sample on the second clamping assembly.

[0017] Furthermore, in order to enable the moving clamp to move along a set direction, a slide rail is provided on the base, and the second outer sleeve is slidably mounted on the slide rail. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of this application.

[0019] Figure 2 for Figure 1 A schematic diagram of the structure after removing the first clamping component and the second clamping component.

[0020] Figure 3 This is a schematic diagram of the structure of the first clamping component.

[0021] Figure 4 This is an exploded view of the first clamping component.

[0022] Figure 5 This is a schematic diagram of the first clamping assembly with copper-clad steel monofilament wire wound around it. Detailed Implementation

[0023] See Figures 1-4 A tensile strength testing device for copper-clad steel monofilament wire includes a base 11, a fixed clamp 20, a movable clamp 30 and a tensile device 40 mounted on the base 11. The fixed clamp, the movable clamp and the tensile device are spaced apart along a first axis, wherein the tensile device is located on the side of the movable clamp away from the fixed clamp. Figure 1 The direction of the middle arrow Y indicates the direction of the first axis, which extends horizontally.

[0024] The structure of the fixed clamp 20 is described below:

[0025] The fixed clamp 20 includes a first outer tube 22 fixed on the base 11. The first outer tube 22 has a tapered first inner cavity 221, the small end of which faces the movable clamp.

[0026] A first clamping assembly 50 is installed in the first inner cavity. The first clamping assembly 50 includes a first conical roller 501 and a first conical rubber sleeve 502 sleeved on the first conical roller. The outer peripheral surface of the first conical rubber sleeve is conical, and the taper of the outer peripheral surface of the first conical rubber sleeve is the same as the taper of the first inner cavity.

[0027] A first outer spiral groove 52 is provided on the outer circumferential surface of the first conical roller 501, and a first inner spiral groove 59 is provided on the inner circumferential surface of the first conical rubber sleeve. The first conical rubber sleeve is screwed onto the first outer spiral groove via the first inner spiral groove. In this embodiment, a first base body 21 is fixedly installed on the base, and a first sleeve is fixedly installed on the top of the first base body 21. A first end plate 23 is installed at the end of the first outer sleeve facing the moving clamp, and a first center hole 24 is provided on the first end plate 23. In this embodiment, the first end plate 23 and the first outer sleeve are integrally formed.

[0028] The first conical roller 501 has a first arc-shaped groove 54 inside the roller body 51. The inlet end 541 of the first arc-shaped groove 54 passes through the end face of the small end of the first conical roller along the axial direction, and the outlet end 542 of the first arc-shaped groove passes through the bottom of the first outer spiral groove along the inclined direction. The outlet end of the first arc-shaped groove is located on one side of the small end of the first conical roller.

[0029] A first guide ring 56 is screwed onto the small end of the first conical roller. The first guide ring 56 has a first guide hole 561, which is coaxially arranged with the exit end of the first arc-shaped track, and the inner edge of the first guide hole 561 has a rounded chamfer 562.

[0030] A first locking hole 53 and a first threaded hole 530 are provided at the large end of the first conical roller. The first locking hole penetrates the bottom of the first outer spiral groove radially, and the first threaded hole 530 connects to the first locking hole 53 axially and penetrates the end face of the large end of the first conical roller. A first locking bolt 531 is screwed axially into the first threaded hole 530 and can extend into the first locking hole.

[0031] A first internal thread 222 is provided at the large end of the inner cavity of the first outer sleeve. The first locking tube 27 is screwed onto the first internal thread 222 via an external thread, and the first locking tube 27 abuts against the end face of the large end of the first conical roller.

[0032] The structure of the movable clamp 30 is described below:

[0033] The movable clamp is largely the same as the fixed clamp, and is briefly described below. The movable clamp 30 includes a second outer sleeve 32 movably mounted on the base 11. The second outer sleeve 32 has a tapered second inner cavity 321, the small end of which faces the fixed clamp. That is, the small ends of the first inner cavity and the second inner cavity are arranged opposite to each other. In this embodiment, two slide rails 12 extending along the first axis are provided on the base. The two slide rails 12 are parallel to each other. The second seat 31 is slidably mounted on the two slide rails, and the second outer sleeve is fixedly mounted on the top of the second seat 31.

[0034] A second clamping assembly 60 is installed in the second inner cavity. The second clamping assembly 60 includes a second conical roller and a second conical rubber sleeve fitted onto the second conical roller. The outer circumferential surface of the second conical rubber sleeve is conical, and the taper of the outer circumferential surface of the second conical rubber sleeve is the same as the taper of the second inner cavity. A second outer helical groove is provided on the outer circumferential surface of the second conical roller, and a second inner helical groove is provided on the inner circumferential surface of the second conical rubber sleeve. The second conical rubber sleeve is screwed onto the second outer helical groove via the second inner helical groove. A second end plate 33 is installed at the end of the second outer sleeve facing the fixed clamp, and a second central hole 34 is formed on the second end plate 33. In this embodiment, the second end plate 33 and the second outer sleeve are integrally formed.

[0035] The second conical roller has a second arc-shaped groove inside the roller body. The inlet end of the second arc-shaped groove passes through the end face of the small end of the second conical roller along the axial direction, and the outlet end of the second arc-shaped groove passes through the bottom of the second outer spiral groove along the inclined direction. The outlet end of the second arc-shaped groove is located on one side of the small end of the second conical roller.

[0036] A second guide ring is screwed onto the small end of the second conical roller. The second guide ring has a second guide hole, which is coaxially arranged with the exit end of the second arc-shaped wire track, and the inner edge of the second guide hole has a rounded chamfer. The first guide ring and the second guide ring are coaxially arranged.

[0037] A second locking hole and a second threaded hole are provided at the large end of the second conical roller. The second locking hole penetrates the bottom of the second outer spiral groove radially, and the second threaded hole connects to the second locking hole axially and penetrates the end face of the large end of the second conical roller. The second locking bolt is screwed axially into the second threaded hole and can extend into the second locking hole.

[0038] A second internal thread is provided at the large end of the inner cavity of the second outer sleeve. The second locking tube 47 is screwed onto the second internal thread via the external thread, and the second locking tube abuts against the end face of the large end of the second conical roller.

[0039] The tensioning device 40 includes a hydraulic cylinder 42. The cylinder barrel 421 of the hydraulic cylinder 42 is fixed on the base via a third seat 41. The piston rod 422 of the hydraulic cylinder 42 extends toward the moving clamp, and a tension sensor 43 is installed at the end of the piston rod. Specifically, in this embodiment, the tension sensor 43 is an S-type tension and compression sensor U10A. A connecting part is installed on the side of the tension sensor away from the hydraulic cylinder. The connecting part is detachably installed on the second outer sleeve.

[0040] In this embodiment, the connecting part includes a tension cylinder 44 and an end plate 45. The tension cylinder extends along the first axis, and the end plate 45 is welded to the end of the tension cylinder facing the hydraulic cylinder. A first external thread is provided on the outer peripheral surface of the tension cylinder. The outer peripheral surface of the second outer sleeve 32 is cylindrical, and a second external thread 323 is provided on the outer peripheral surface of the second outer sleeve 32. The two ends of the internal threaded tube 46 are respectively screwed onto the first external thread and the second external thread, so that the connecting part and the second outer sleeve are detachably connected together.

[0041] Please see Figure 5 In this embodiment, during operation, one end of the copper-clad steel monofilament sample 100 to be tested is sequentially passed through the first central hole 24, the first conical rubber sleeve 502, and the first guide wire hole 561 of the first guide wire ring 56, and then enters the first arc-shaped wire channel 54. After extending out of the first arc-shaped wire channel 54, it is wound around the groove of the first outer spiral groove. Finally, the end is inserted into the first locking hole 53, and the end of the sample is tightly pressed against the inner wall of the first locking hole 53 using the first locking bolt 531. The first conical rubber sleeve 502 is screwed onto the first conical roller, and the threaded edges of the first conical rubber sleeve press the sample against the threaded groove of the first outer helical groove 52. Then, the entire first clamping assembly 50 is inserted into the first inner cavity 221 of the first outer sleeve 22. Finally, the first locking tube 27 is screwed onto the first internal thread 222, which deforms the first conical rubber sleeve, tightly pressing the sample into the first outer helical groove, and causing the first conical roller to press against the first end plate, so that one end of the sample 100 is mounted on the fixed clamp. Then, the other end of the sample 100 is mounted on the movable clamp in the same manner.

[0042] Screw the two ends of the internally threaded tube 46 onto the first external thread and the second external thread respectively, so that the piston rod 422 is connected to the moving fixture. Finally, start the hydraulic cylinder to test the tensile strength of the sample.

Claims

1. A tensile strength testing device for copper-clad steel monofilament wire, characterized in that, It includes a base, and a fixed clamp, a movable clamp and a tensioning device mounted on the base. The fixed clamp, the movable clamp and the tensioning device are spaced apart along a first axis, wherein the tensioning device is located on the side of the movable clamp away from the fixed clamp. The clamping fixture includes a first outer sleeve fixed on a base, a first conical inner cavity inside the first outer sleeve, and a first clamping assembly installed in the first inner cavity. The first clamping assembly includes a first conical roller and a first conical rubber sleeve sleeved on the first conical roller. The outer peripheral surface of the first conical rubber sleeve is conical, and the taper of the outer peripheral surface of the first conical rubber sleeve is the same as the taper of the first inner cavity. A first outer spiral groove is provided on the outer peripheral surface of the first conical roller, and a first inner spiral groove is provided on the inner peripheral surface of the first conical rubber sleeve. The first conical rubber sleeve is screwed onto the first outer spiral groove via the first inner spiral groove. The movable clamp includes a second outer sleeve movably mounted on a base, and a second conical inner cavity inside the second outer sleeve. A second clamping assembly is installed in the second inner cavity. The second clamping assembly includes a second conical roller and a second conical rubber sleeve sleeved on the second conical roller. The outer peripheral surface of the second conical rubber sleeve is conical, and the taper of the outer peripheral surface of the second conical rubber sleeve is the same as the taper of the second inner cavity. A second outer helical groove is provided on the outer peripheral surface of the second conical roller, and a second inner helical groove is provided on the inner peripheral surface of the second conical rubber sleeve. The second conical rubber sleeve is screwed onto the second outer helical groove via the second inner helical groove. The first conical roller has a first arc-shaped groove inside the roller body. The inlet end of the first arc-shaped groove passes through the end face of the small end of the first conical roller along the axial direction, and the outlet end of the first arc-shaped groove passes through the bottom of the first outer spiral groove along the inclined direction. The outlet end of the first arc-shaped groove is located on one side of the small end of the first conical roller. The second conical roller has a second arc-shaped groove inside the roller body. The inlet end of the second arc-shaped groove passes through the end face of the small end of the second conical roller along the axial direction, and the outlet end of the second arc-shaped groove passes through the bottom of the second outer spiral groove along the inclined direction. The outlet end of the second arc-shaped groove is located on one side of the small end of the second conical roller. The small ends of the first inner cavity and the second inner cavity are positioned opposite each other; The tensioning device includes a hydraulic cylinder, the cylinder barrel of which is fixed on a base, the piston rod of which extends toward the moving clamp, and a tension sensor is installed at the end of the piston rod. A connecting part is installed on the side of the tension sensor away from the hydraulic cylinder, and the connecting part is detachably installed on the second outer sleeve.

2. The tensile strength testing device according to claim 1, characterized in that, An end plate is installed at the opposite end of the first outer tube and the second outer tube, and a central hole is opened on the end plate.

3. The tensile strength testing device according to claim 1, characterized in that, A first guide ring is screwed onto the small end of the first conical roller, and the guide hole of the first guide ring is coaxially arranged with the exit end of the first arc-shaped track; a second guide ring is screwed onto the small end of the second conical roller, and the guide hole of the second guide ring is coaxially arranged with the exit end of the second arc-shaped track.

4. The tensile strength testing device according to claim 3, characterized in that, The guide hole of the first guide ring is coaxially arranged with the guide hole of the second guide ring.

5. The tensile strength testing device according to claim 1, characterized in that, The first conical roller has a first locking hole at its large end that extends radially through the bottom of the first outer spiral groove. A first locking bolt is screwed axially onto the large end of the first conical roller and can extend into the first locking hole. The second conical roller has a second locking hole at its large end that extends radially through the bottom of the second outer spiral groove. A second locking bolt is screwed axially onto the large end of the second conical roller and can extend into the second locking hole.

6. The tensile strength testing device according to claim 1, characterized in that, A first locking tube is screwed onto the large end of the inner cavity of the first outer sleeve, and the first locking tube presses against the end face of the large end of the first conical roller; a second locking tube is screwed onto the large end of the inner cavity of the second outer sleeve, and the second locking tube presses against the end face of the large end of the second conical roller.

7. The tensile strength testing device according to claim 1, characterized in that, The two ends of the internally threaded tube are screwed onto the outer circumference of the connecting part and the second outer sleeve, respectively, so that the connecting part can be detachably installed on the second outer sleeve.

8. The tensile strength testing device according to claim 1, characterized in that, A slide rail is provided on the base, and the second outer sleeve is slidably installed on the slide rail.

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