A device for testing the torsion of ultra-fine metal wire

Abstract

This invention relates to a torsion testing device for ultra-fine metal wires, comprising a base with at least three sets of clamps for tensioning the metal wire. The clamps include a rotating clamp mounted on the right side of the base and rotating thereon, and a movable clamp positioned at a distance from the rotating clamp and moving when the metal wire breaks due to torsion. The two ends of the metal wire to be tested are fixed between the rotating clamp and the movable clamp, respectively. An encoder is mounted on the rotating clamp to record the number of torsion rotations of the metal wire when it breaks while simultaneously rotating with the clamp. A photoelectric switch on the base controls the encoder to stop counting the torsion rotations of the metal wire. This invention fixes the metal wire to be tested between the rotating clamp and the movable clamp, allowing for the testing of multiple metal wires. The encoder records the number of torsion rotations of the metal wire when it breaks while simultaneously rotating with the clamp and displays this information visually on a human-machine interface. The rotation speed can be arbitrarily set, meeting the testing requirements for metal wires with a diameter of 0.1 mm.

Description

Technical Field

[0001] This invention relates to the field of metal material testing technology, and in particular to a device for testing the torsion of ultrafine metal wires. Background Technology

[0002] Torsion testing machines are widely used in torsion testing of wire products such as spring steel, wire rope, steel wire, wire, cable and other metallic and non-metallic materials to obtain performance parameters such as maximum torque, torsional strength, upper yield strength and lower yield strength of the materials.

[0003] Metal wire torsion is a process in which the wire is twisted in one or two directions with itself as the axis until the sample breaks. The number of torsion turns per unit diameter and length at which the wire breaks is used to measure the material’s resistance to torsion.

[0004] Most current testing devices can test wires with diameters ranging from 0.3mm to 10mm, and a few can test wires with diameters ranging from 0.3mm to 0.1mm. However, when testing wires with diameters less than 0.1mm, it is generally necessary to change the fixtures, which inevitably leads to the following problems during use.

[0005] Firstly, traditional torsion testing machines mostly use three-jaw chucks or drill press chucks to clamp the specimens. This is convenient for clamping thicker specimens, but metal wires are manufactured using mold compression and drum traction, so they naturally form coils. The thinner the wire, the smaller the coil diameter, and even a short section will be bent. In this case, using a two-jaw clamp results in poor positioning accuracy, and the thin wire cannot be guaranteed to be clamped at the center of rotation of the clamp. Because the wire is too thin, it is difficult to clamp properly after the clamp wears down, and it is easy for the wire to fall off during testing, rendering the test results invalid.

[0006] For a unit length of metal wire, the thinner the diameter, the more torsional turns it can withstand. In order to obtain a larger torque, the torsion tester rotates at a slower speed, generally below 60 revolutions per minute. However, a 0.1 mm diameter stainless steel wire breaks at more than 500 revolutions per minute. Including clamping, a single test takes at least 15 minutes and can only produce one sample at a time, which is inefficient and cannot meet the testing requirements. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the prior art, the present invention provides an ultra-fine metal wire torsion testing device that can improve positioning accuracy, expand the rotation speed range, and meet the testing requirements of metal wires with a diameter of less than 0.1 mm.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: an ultra-fine metal wire torsion testing device, comprising a base, wherein the base is provided with at least three sets of clamps for longitudinally tightening the metal wire, the clamps including a rotating clamp mounted on the right end of the base for rotating motion, and a movable clamp set apart from the rotating clamp and capable of longitudinal movement when the metal wire breaks due to torsion, the two ends of the metal wire to be tested are respectively fixed between the rotating clamp and the movable clamp, a drive mechanism for driving the rotating clamp to rotate is installed on the base, and an encoder is installed on the rotating clamp to record the number of torsion turns of the metal wire when the rotating clamp rotates synchronously to the point of breakage; a weight is suspended on the left end of the base and connected to the movable clamp by a steel wire rope, and a photoelectric switch is provided on the base to the left of the movable clamp to control the encoder to stop counting the number of torsion turns of the metal wire when the metal wire breaks.

[0009] Preferably, the machine base is equipped with three sets of clamps for tensioning metal wires, and the metal wires are fixed between the moving clamp and the rotating clamp by positioning pins and clamping nuts.

[0010] Specifically, the drive mechanism includes a geared motor and a gearbox mounted on a base. The gearbox contains three gears that mesh sequentially. The power output ends of the drive shafts of the three gears are respectively connected to the rotary clamp. The output shaft of the geared motor is connected to the input end of the drive shaft of the first gear via a coupling. The encoder is mounted on the drive shaft of the third gear.

[0011] Furthermore, the machine base is equipped with a speed controller for setting the speed of the geared motor, a human-machine interface for setting the number of twists of the metal wire, as well as a start button and a stop button.

[0012] Furthermore, three guide rails are fixed side by side on the base, and a slider that slides with the guide rail is fixed on the bottom surface of each movable fixture. A sensing post that triggers the photoelectric switch to move as the movable fixture moves is fixed on the left end of each movable fixture.

[0013] Furthermore, a mounting base is fixed on the machine base, and the guide rail is fixed on the base plate of the mounting base. The left end of the mounting base is provided with a baffle that can move perpendicular to the moving direction of the movable clamp. The baffle is provided with three grooves at intervals corresponding to the movable clamp. One side of each groove is inclined. The movable clamp is provided with rollers that can be inserted into the grooves.

[0014] Three pulleys are installed at intervals on the left side of the machine base, and the end of the steel wire rope suspending the weight passes around the pulleys and is connected to the set screw fixed on the moving clamp.

[0015] The beneficial effects of this invention are as follows: This invention uses a method of fixing the metal wire to be tested between a rotating fixture and a moving fixture, which results in fast clamping speed and high positioning accuracy of the metal wire, ensuring that the metal wire always rotates around its own axis as the center of rotation during the torsion process; it is highly efficient, allowing multiple metal wire samples to be tested at once; during the test, the number of torsion rotations of the metal wire synchronously rotating fixture until it breaks is recorded by an encoder, and can be displayed intuitively on the human-machine interface screen; the rotation speed can be arbitrarily set according to different materials, with a wide rotation speed range, and it can test wires with diameters of any size below 0.1 mm. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the installation structure of the rotary clamp described in this invention.

[0019] Figure 3 This is a schematic diagram of the structure of the movable clamp described in this invention.

[0020] Figure 4 This is a schematic diagram of the installation structure of the mobile clamp described in this invention.

[0021] Figure 5 This is one of the schematic diagrams showing the installation of the metal wire described in this invention on a moving clamp.

[0022] Figure 6 This is the second schematic diagram of the installation of the metal wire described in this invention on the moving clamp.

[0023] In the diagram: 1. Base, 2. Rotary clamp, 3. Moving clamp, 4. Positioning column, 5. Clamping nut, 6. Metal wire, 7. Gear motor, 8. Gearbox, 9. Gear, 10. Encoder, 11. Speed ​​controller, 12. Human-machine interface, 13. Start button, 14. Stop button, 15. Mounting base, 16. Guide rail, 17. Slider, 18. Counterweight, 19. Pulley, 20. Photoelectric switch, 21. Sensing column, 22. Baffle, 23. Groove, 24. Roller. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0025] like Figure 1 , Figure 2The device for testing the torsion of ultra-fine metal wires shown includes a base 1 with an upper plate and inclined side plates. Three sets of clamps for longitudinally tightening metal wires 6 are provided on the upper plate of the base 1. Each set of clamps includes three rotating clamps 2 installed side by side on the right side of the upper plate of the base 1 and three movable clamps 3 arranged at intervals from the rotating clamps 2. The rotating clamps 2 are cylindrical structures with a milled plane along their axis on the left half of the rotating clamps 2. The movable clamps 3 are rectangular structures. The metal wire 6 to be tested is fixed between the upper surface of the movable clamps 3 and the milled plane of the rotating clamps 2 by positioning pins 4 and clamping nuts 5.

[0026] A drive mechanism for rotating the rotary clamp 2 is mounted on a flat plate on the base 1 located to the right of the rotary clamp 2. The drive mechanism includes a geared motor 7 and a gearbox 8 mounted on the flat plate on the base 1. The gearbox 8 contains three sequentially meshing gears 9 with identical technical parameters. The power output ends of the drive shafts of the three gears 9 are respectively connected to the three rotary clamps 2. The output shaft of the geared motor 7 is connected to the input end of the drive shaft of the first gear 9 via a coupling. The geared motor 7 drives the three rotary clamps 2 to rotate at the same speed through the three gears 9 in the gearbox 8. An encoder 10 is mounted on the drive shaft of the third gear 9. The encoder 10 is used to record the number of rotations of the synchronous rotary clamp 2 of the metal wire 6 until it breaks, with an accuracy of 0.1 rotations.

[0027] The inclined side plate of the base 1 is equipped with a speed controller 11, a human-machine interface 12, a start button 13, and a stop button 14. By adjusting the speed controller 11, the speed of the geared motor 7 can be set. In conjunction with the reduction ratio of the geared motor 7 itself, the speed range is 60 to 300 revolutions per minute. The human-machine interface 12 is used to set parameters. According to different specifications of metal wires 6, the number of qualified torsion turns can be set, and the specific parameters during the test can be displayed. Each metal wire 6 is displayed separately. The start button 13 and the stop button 14 are used to start and stop the geared motor 7, respectively.

[0028] like Figure 3 , Figure 4 As shown, a mounting base 15 is fixed on the base 1 where the movable clamp 3 is located. Three guide rails 16 are fixed side by side on the bottom plate of the mounting base 15. A slider 17 that slides with the guide rail 16 is fixed on the bottom surface of each movable clamp 3. Each movable clamp 3 can slide left and right independently. Each movable clamp 3 is connected to a weight 18 by a steel wire rope. The upper end of the steel wire rope is connected to a set screw fixed on the movable clamp 3. The weight 18 is connected to the lower end of the steel wire rope and passes around the pulley 19 installed on the left side of the base 1, hanging vertically to the ground, maintaining a constant tension to the left.

[0029] Each movable clamp 3 has a photoelectric switch 20 on the base 1 on the left side, which controls the encoder 10 to stop counting the number of twists of the metal wire 6 when the metal wire 6 breaks. The photoelectric switch 20 has a slot in the middle of the upper part. Each movable clamp 3 has a sensing post 21 fixed on the left end, which is inserted into the slot as the movable clamp 3 moves to trigger the photoelectric switch 20.

[0030] A baffle 22 is provided at the left end of the mounting base 15, which can move vertically in the direction of the moving clamp 3. Three grooves 23 corresponding to the moving clamp 3 are provided on the baffle 22 at intervals. One side of the groove 23 is inclined. A roller 24 that can be inserted into the groove 23 is installed at the left rear end of the moving clamp 3.

[0031] Combination Figure 2 , Figure 5 , Figure 6 As shown, during the test, the right ends of the three metal wires 6 are first wrapped around the positioning post 4 of the rotating clamp 2, and then the clamping nut 5 is used to press the metal wires 6 onto the milling surface of the rotating clamp 2. The baffle 22 is pushed backward, causing the roller 24 to roll along the inclined surface of the groove 23 on the side of the baffle 22, so that the three moving clamps 3 move to the right. Then, the left end of the metal wires 6 is wrapped around the positioning post 4 of the moving clamp 3 and pressed tightly with the clamping nut 5. After all three metal wires 6 are fixed, the baffle 22 is moved forward to reset. Because both ends of the metal wires 6 are fixed, they will not move under the traction force of the weight 18.

[0032] The geared motor 7 synchronously drives three rotating clamps 2 to rotate at the same speed via three gears 9. The encoder 10 synchronously rotates the drive shaft of the third gear 9, recording the number of rotations of the metal wire 6. When one of the metal wires 6 breaks after twisting a certain number of times, the corresponding moving clamp 3 moves to the left under the pulling force of the counterweight 18, and the roller 24 returns to the groove 23 of the baffle 22. At this time, the sensing column 21 moves with the moving clamp 3 to the slot in the middle of the photoelectric switch 20, triggering the photoelectric switch 20 to stop the encoder 10 from counting the number of twists of this metal wire 6, and displays the number of twists on the human-machine interface 12. When all three metal wires 6 break, the geared motor 7 stops rotating, the metal wires 6 are removed from the clamps, and the operation can be repeated.

[0033] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for testing the torsion of ultrafine metal wires, comprising a base, characterized in that: The machine base is provided with at least three sets of clamps for longitudinally tightening the metal wire. The clamps include a rotating clamp installed on the right side of the machine base and rotating thereon, and a movable clamp set apart from the rotating clamp and capable of longitudinal movement when the metal wire breaks due to torsion. The two ends of the metal wire to be tested are fixed between the rotating clamp and the movable clamp, respectively. A drive mechanism is installed on the machine base to drive the rotating clamp to rotate. An encoder is installed on the rotating clamp to record the number of torsion turns of the metal wire when it breaks due to synchronous rotation of the rotating clamp. A weight is suspended from the left side of the machine base and connected to the movable clamp by a steel wire rope. A photoelectric switch is provided on the machine base to the left of the movable clamp to control the encoder to stop counting the number of torsion turns of the metal wire when it breaks. The base is fixed with three guide rails side by side. Each movable fixture has a slider fixed on its bottom surface that slides with the guide rail. Each movable fixture has a sensing post fixed on its left end that triggers the photoelectric switch to move as the movable fixture moves. The machine base is fixed with a mounting base, and the guide rail is fixed on the base plate of the mounting base. The left end of the mounting base is provided with a baffle that can move perpendicular to the direction of movement of the movable clamp. The baffle is provided with three grooves at intervals corresponding to the movable clamp. One side of each groove is inclined. The movable clamp is provided with rollers that can be inserted into the grooves.

2. The ultra-fine metal wire torsion testing device as described in claim 1, characterized in that: The machine base is equipped with three sets of clamps for tensioning metal wires, and the metal wires are fixed between the moving clamp and the rotating clamp by positioning pins and clamping nuts.

3. The ultra-fine metal wire torsion testing device as described in claim 1, characterized in that: The drive mechanism includes a geared motor and a gearbox mounted on a base. The gearbox contains three gears that mesh sequentially. The power output ends of the drive shafts of the three gears are respectively connected to the rotary clamp. The output shaft of the geared motor is connected to the input end of the drive shaft of the first gear via a coupling. The encoder is mounted on the drive shaft of the third gear.

4. The ultra-fine metal wire torsion testing device as described in claim 3, characterized in that: The base is equipped with a speed controller for setting the speed of the geared motor, a human-machine interface for setting the number of twists of the metal wire, as well as a start button and a stop button.

5. The ultra-fine metal wire torsion testing device as described in claim 1, characterized in that: Three pulleys are installed at intervals on the left side of the machine base, and the end of the steel wire rope suspending the weight passes around the pulleys and is connected to the set screw fixed on the moving clamp.

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