Automatic detection device for wire torsional fatigue life and testing method thereof

Abstract

This application relates to the technical field of fatigue testing equipment for metallic materials, and in particular to an automated testing device and method for the torsional fatigue life of metal wires. The device includes a first clamp and a second clamp, which clamp and fix the two ends of a metal wire sample, respectively; a drive motor, used to drive the first and second clamps to rotate relative to each other; a power supply, clamps, and a metal wire sample clamp connected in sequence to form a testing loop; a signal acquisition module connected to the testing loop to acquire the on / off signals of the testing loop; and a main controller electrically connected to the signal acquisition module to receive the on / off signals. The main controller controls the start and stop of the drive motor through the on / off signals. The method for testing the torsional fatigue life of metal wires using the aforementioned automated testing equipment achieves accurate and stable testing of the torsional fatigue life of metal wires. This application effectively solves the problems of detection failure and data errors, ensuring accurate detection of metal wire fracture.

Description

Technical Field

[0001] This application relates to the technical field of fatigue testing equipment for metallic materials, and in particular to an automated testing device and testing method for the torsional fatigue life of a metal wire. Background Technology

[0002] Various metal wires, such as nickel-titanium alloy wires, are commonly used in various industries and are widely applied in precision fields such as medical devices (e.g., dental orthodontic wires), consumer electronics (e.g., memory steel wires for Bluetooth headset neckbands), and aerospace. The torsional fatigue life of these metal wires is a core performance indicator for measuring their reliability.

[0003] Currently, the mainstream equipment used in the industry for torsional fatigue testing of such metal wires is the torsional fatigue testing machine. However, most torsional fatigue testing machines are not suitable for the aforementioned nickel-titanium alloy wires. Some torsional fatigue testing machines specifically designed for metal wires clamp both ends of the wire and use a motor to drive it to twist. When the wire breaks, it touches a sensor, and the sensor signal is fed back to the motor, causing it to stop. For example, utility model patent CN212931866U.

[0004] However, the above-mentioned method, which monitors wire breakage by triggering a sensor, has the following drawbacks: Firstly, if the wire breaks but fails to contact the sensor in time or at all, breakage detection is impossible, which can easily lead to erroneous test data. Secondly, the sensor is susceptible to external interference, generating erroneous signals and potentially causing test interruptions, thus affecting the stability and accuracy of the entire testing process. Summary of the Invention

[0005] To address the aforementioned issues and ensure the stable execution of torsional fatigue testing of metal wires, this application provides an automated testing device and method for torsional fatigue life of metal wires.

[0006] On the one hand, this application provides an automated testing device for the torsional fatigue life of metal wires, employing the following technical solution: An automated testing device for the torsional fatigue life of a metal wire, comprising: The fixture includes a first fixture and a second fixture, which clamp and fix the two ends of the metal wire sample, respectively. A drive motor is used to drive the first clamp and the second clamp to rotate relative to each other, thereby achieving the torsion of the metal wire sample; A power supply, a first clamp, a metal wire sample, and a second clamp are connected in sequence to form a detection circuit; the detection circuit is in a conductive state when the metal wire sample is intact and in a disconnected state when the metal wire sample is broken. The signal acquisition module is connected to the detection circuit to acquire the on / off signal of the detection circuit; The main controller has its signal input terminal electrically connected to the signal acquisition module to receive on / off signals; the output terminal of the main controller is electrically connected to the drive motor; the main controller controls the start and stop of the drive motor through the on / off signals.

[0007] By adopting the above technical solution, the metal wire sample is clamped and fixed at both ends by a fixture, and the drive motor drives the fixture to rotate relative to each other to achieve the twisting of the metal wire, thus constructing a detection circuit. The on / off state of the metal wire sample corresponds to the on / off state of the circuit. The signal acquisition module collects the on / off signal of the circuit, and the main controller receives the signal and controls the start and stop of the drive motor. This avoids the problems of incorrect test data and test interruption caused by the metal wire breaking and not being able to touch the sensor or the sensor being affected by external interference, and realizes the stable performance of the metal wire torsional fatigue test.

[0008] Preferably, the signal acquisition module uses a pull-down resistor, which has a first end and a second end. The first end is connected to the output end of the detection circuit and the signal input end of the main controller, and the second end is grounded.

[0009] By adopting the above technical solution, using pull-down resistors as signal acquisition modules and completing related connections, the on / off signals of the detection circuit can be better acquired and accurately fed back to the main controller. This enables the main controller to more stably control the start and stop of the drive motor based on these on / off signals. This helps to solve the data errors and test interruption problems that are prone to occur when using sensors to detect metal wire breakage in the traditional way, and ensures the stable conduct of metal wire torsional fatigue testing.

[0010] Preferably, the signal acquisition module further includes an RC filter circuit, which is located between the first terminal and the signal input terminal of the main controller, and is used to filter out electromagnetic noise interference in the detection circuit.

[0011] By adopting the above technical solution, the RC filter circuit in the signal acquisition module is located between the first end of the pull-down resistor and the signal input terminal of the main controller, which can filter out electromagnetic noise interference in the detection circuit and improve the accuracy and stability of signal acquisition.

[0012] Preferably, both the first clamp and the second clamp include an insulating outer clamp and a conductive inner clamp; the outer clamp includes two clamping plates rotatably connected, and the inner clamp is disposed between the two clamping plates; the metal wire sample is connected to the inner clamp; the inner clamp is connected to the power supply via a wire.

[0013] By adopting the above technical solution, the first clamp and the second clamp adopt the structure of an insulating outer clamp and a conductive inner clamp. The two rotatingly connected clamps of the outer clamp can fix the inner clamp. The metal wire sample is connected to the inner clamp, and the inner clamp is connected to the power supply through a wire. This can ensure the electrical connection between the metal wire sample and the power supply, make the detection circuit stable and conductive, avoid external interference, and ensure the stable conduction of the metal wire torsional fatigue test.

[0014] Preferably, the inner clamp includes a clamping piece disposed between two clamping plates, a plug disposed on the clamping piece, and a wire; the clamping piece is fixed by clamping the two clamping plates; the plug is mated to the end of the metal wire sample; one end of the wire is connected to the clamping piece, and the wire is fixed by clamping the clamping plate, and the other end is used to connect to a power supply or a main controller.

[0015] By adopting the above technical solution, an internal clamp is formed by clamping plates, plugs, and wires. The clamping plates are held and fixed by clamping plates, the plugs are connected to the ends of the metal wire samples, and the wires are connected to the clamping plates and then connected to the power supply or main controller after being held and fixed by the clamping plates. This achieves a stable connection between the metal wire samples and the power supply or main controller, ensuring the normal conduction of the detection circuit, thereby ensuring that the equipment can accurately detect the torsional fatigue performance of the metal wire samples.

[0016] Preferably, the plug extends to the horizontal side of the clip and forms a hook, which is hung on the clip.

[0017] By adopting the above technical solution, the plug is extended into a hook and hung on the clamp, which can further fix the position of the plug and ensure the stability of the connection between the plug and the end of the metal wire sample and the reliability of the electrical connection.

[0018] Preferably, the end of the conductor is connected to a contact piece, which abuts against the clamping piece; the contact piece has a connection hole, and the clamping piece has a connecting post that is inserted into the connection hole.

[0019] By adopting the above technical solution, the end of the wire is connected to a contact piece, the contact piece abuts against the clamp, and the connection hole of the contact piece is inserted into the connection post of the clamp, which can ensure a reliable connection between the wire and the clamp and guarantee the stability of the detection circuit.

[0020] Preferably, a wire frame is provided on one side of the clamp, and the wires are laid along the wire frame.

[0021] By adopting the above technical solution, a wire guide is set on one side of the fixture and the wires are laid along the wire guide, which can play a role in regulating and guiding the wires, avoiding tangling and mess during equipment operation, and ensuring the normal operation of the equipment and the stability of the test.

[0022] Preferably, the main controller includes a main control unit, a motor driver, and a counter; the main control unit is an MCU; the MCU is electrically connected to the drive motor through the motor driver; the counter is used to read the number of twists and is connected to the MCU for communication.

[0023] By adopting the above technical solution, the main controller uses an MCU as the main control unit and is connected to the drive motor through a motor driver, which can accurately control the drive motor; the counter reads the number of twists and communicates with the MCU, which can accurately record the number of twists of the metal wire.

[0024] On the other hand, this application provides a method for testing the torsional fatigue life of a metal wire, using the aforementioned automated testing equipment for the torsional fatigue life of a metal wire, comprising the following steps: a) Mount metal wire samples at at least two test stations of the testing equipment, and form independent testing circuits respectively; b) Start the testing equipment, and the main controller independently controls and drives each testing station to perform reciprocating torsion tests on the metal wire sample, and independently counts the number of torsions of the metal wire sample at each station. c) The main controller monitors the on / off status of each of the detection loops in parallel; d) When any detection circuit changes from a conducting state to a disconnected state due to the breakage of its corresponding metal wire sample, the main controller responds to the state change and performs the following operations: locks the torsion count value and torsion time corresponding to the broken metal wire sample as its fatigue life, and stops the torsion movement of the test station. e) Continue with steps b) and c) at the test stations where other unbroken wire samples are located until all wire samples have broken.

[0025] In summary, the present invention has at least one of the following beneficial technical effects: 1. A detection circuit is constructed by sequentially connecting a power supply, a first fixture, a metal wire sample, and a second fixture. The circuit is open when the metal wire sample is intact and open when it breaks. The signal acquisition module collects the on / off signal and transmits it to the main controller, which then controls the start and stop of the drive motor based on the signal. This method avoids the detection failure caused by the metal wire breaking and failing to contact the sensor in time, as is common in traditional methods. It ensures accurate detection of metal wire breakage and effectively solves the problems of detection failure and data errors. 2. The signal acquisition module uses pull-down resistors and sets up an RC filter circuit between its first end and the signal input end of the main controller. The pull-down resistors and RC filter circuits work together to effectively eliminate electromagnetic noise interference in the detection loop, avoid external interference from generating erroneous signals, prevent test interruption due to erroneous signals, and thus ensure the stable progress of the test process. 3. The main controller includes a counter, which is connected to the main control unit (MCU). During the process of the drive motor driving the first and second clamps to rotate relative to each other and causing the metal wire sample to twist, the counter can read the number of twists in real time, thereby accurately obtaining the torsional fatigue life data of the metal wire. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the automated testing equipment for the torsional fatigue life of metal wire in the embodiments of this application; Figure 2 This is a schematic diagram of the fixture in the embodiments of this application; Figure 3 This is a schematic diagram of the circuit structure of an automated testing device for the torsional fatigue life of metal wires in an embodiment of this application.

[0027] The following labels are used in the attached diagram: 1. Main controller; 11. MCU; 12. Signal acquisition module; 13. RC filter circuit; 14. Motor driver; 15. Counter; 2. Base; 21. Turntable; 22. Slide table; 23. Wire frame; 3. First clamp; 31. Outer clamp; 32. Inner clamp; 321. Clamping piece; 322. Plug; 323. Wire; 324. Contact piece; 325. Connecting post; 326. Connecting hole; 4. Second clamp; 5. Drive motor; 6. Metal wire sample. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Figure 3 The present invention will be described in further detail below.

[0029] The automated testing equipment for the torsional fatigue life of metal wire provided in this application embodiment refers to... Figure 1 The testing equipment includes a main controller 1 and multiple testing stations. Each testing station has a fixture, a drive motor 5, a power supply, and a signal acquisition module 12. The fixture includes a first fixture 3 and a second fixture 4, which clamp and fix the two ends of the metal wire sample 6 respectively. The drive motor 5 drives the first fixture 3 and the second fixture 4 to rotate relative to each other, thereby achieving the torsion of the metal wire sample 6. The power supply, the first fixture 3, the metal wire sample 6, and the second fixture 4 are sequentially connected to form a detection circuit. This detection circuit is in a conductive state when the metal wire sample 6 is intact and in a disconnected state when the metal wire sample 6 is broken. The signal acquisition module 12 is connected to the detection circuit to collect the on / off signal of the detection circuit. The signal input terminal of the main controller 1 is electrically connected to the signal acquisition module 12 to receive the on / off signal, and the output terminal of the main controller 1 is electrically connected to the drive motor 5. The main controller 1 controls the start and stop of the drive motor 5 through the on / off signal.

[0030] Specifically, multiple testing stations are integrated on a single base 2. The multiple testing stations are spaced apart on the top of the base 2. Each station is equipped with two turntables 21. A first clamp 3 and a second clamp 4 are mounted on the upper end of the turntable 21 and fixed to it. The drive motor 5 drives the rotation of the first clamp 3 and the second clamp 4 by driving the rotation of the turntable 21.

[0031] In this embodiment, the two turntables 21 rotate synchronously in opposite directions, thereby achieving the torsion of the wire sample 6. Each turntable 21 rotates clockwise and counterclockwise repeatedly within a certain angle. For example, the turntable 21 rotates 90 degrees and then counterclockwise, and then counterclockwise again after rotating 90 degrees, and so on in a repeated cycle.

[0032] Furthermore, the two turntables 21 can be driven simultaneously by a single drive motor 5 via a gear set, allowing both turntables 21 to rotate synchronously. Alternatively, two drive motors 5 can be connected to the two turntables 21 respectively, enabling each drive motor 5 to drive the two turntables 21 independently. The drive motors 5 can be servo motors with high control precision.

[0033] The distance between the first clamp 3 and the second clamp 4 is adjustable. Specifically, the machine base 2 is equipped with a guide rail, and a slide 22 is mounted on the guide rail. The turntable 21 is mounted on the slide 22. By adjusting the positions of the two slides 22, the distance between the first clamp 3 and the second clamp 4 can be adjusted to accommodate metal wires of different models and lengths. The slides 22 can be fixed to the machine base 2 with bolts to ensure stability.

[0034] Reference Figure 1 and Figure 2 Specifically, the first clamp 3 and the second clamp 4 in the fixture both include an insulating outer clamp 31 and a conductive inner clamp 32. The outer clamp 31 includes two clamping plates, both of which are vertically arranged. The two clamping plates are rotatably connected by hinges or other means to facilitate opening and closing to clamp the metal wire sample 6. The two clamping plates are fixed to each other by a locking buckle.

[0035] The metal wire sample 6 spans across the space between the first clamp 3 and the second clamp 4 from above, with both ends of the metal wire sample 6 clamped within the first clamp 3 and the second clamp 4 respectively. The middle part of the metal wire sample 6 is curved. When the metal wire sample 6 breaks, the two sides of the broken part of the metal wire will automatically separate under its own elasticity, thereby realizing the automatic disconnection of the detection circuit.

[0036] The clamps can be made of insulating materials such as plastic to ensure electrical isolation.

[0037] The inner clamp 32 is made of common conductive metal. The inner clamp 32 includes a metal clip 321, a plug 322 mounted on the clip 321, and a wire 323. The clip 321 can be made of a metal with good conductivity, such as aluminum or copper, and is in the shape of a thin plate. The clip 321 is positioned between two clamping plates and is held and fixed by the clamping plates to ensure its stable position.

[0038] The plug 322 is located above the clamp 321 and is integrally formed with the clamp 321. The plug 322 protrudes above the clamp to facilitate connection with the metal wire sample 6. The plug 322 has a socket that can mate with the end of the metal wire sample 6. Optionally, the plug 322 can also be equipped with a conductive clip to fix the end of the metal wire and achieve a conductive connection through clamping force.

[0039] Furthermore, the plug 322 extends to the horizontal side of the clip 321 and forms a hook, which is hung on the clip plate. This not only further secures the plug 322, but also prevents the plug 322 from shifting during the twisting of the metal wire.

[0040] One end of the wire 323 is connected to the clip 321, and the other end is used to connect to the power supply or the main controller 1, thereby constructing a complete signal circuit. Furthermore, a contact piece 324 is provided at the end of the wire 323 connected to the clip 321. The contact piece 324 abuts against the clip 321. The contact piece 324 can be a circular or square conductive metal sheet, which fits against the clip 321 to increase the contact area and improve conductivity. A connection hole 326 is provided on the contact piece 324, and a connecting post 325 is provided on the clip 321 to engage with the connection hole 326. This engagement method ensures a reliable connection between the wire 323 and the clip 321, preventing the clip 321 from slipping or falling off relative to the contact piece 324.

[0041] In addition, this structure ensures the independence of the inner clamp 32, which can be replaced during testing to accommodate different metal wires.

[0042] To further ensure the stability of conductor 323, the wire at the end of conductor 323 can be clamped and fixed by a clamp to prevent conductor 323 from loosening or shaking during the test, which would affect the accuracy of the test.

[0043] A wire rack 23 is provided on one side of the fixture, and the wires 323 are laid along the wire rack 23. The wire rack 23 can be a plastic support, which serves to organize and fix the wires 323 and prevent the wires 323 from getting tangled and affecting the test.

[0044] Reference Figure 3In this embodiment, the main controller 1 includes an MCU 11, which is the core control unit of the entire device, possessing data processing and logic judgment capabilities. The power supply, the inner clamp 32 of the first clamp 3, the metal wire sample 6, and the inner clamp 32 of the second clamp 4 are connected sequentially, and finally connected to the signal input terminal of the MCU 11. The signal acquisition module 12 uses pull-down resistors, which have a first terminal and a second terminal. The first terminal is connected to the output terminal of the detection circuit and the signal input terminal of the main controller 1, and the second terminal is grounded.

[0045] When the metal wire sample 6 is intact, the detection circuit is activated, and the metal wire sample 6 provides a path from the power supply to the MCU11. The voltage of the MCU11 signal input pin is "pulled high" to a level close to the power supply level. At this time, the MCU11 signal pin is at a high level. The MCU11 then controls the drive motor 5 to continue operating.

[0046] When the metal wire sample 6 breaks, the detection circuit is disconnected, and the path between the power supply and MCU11 is broken. Since the pull-down resistor is grounded, the voltage at the signal input terminal of MCU11 is pulled down to zero potential, and the signal pin of MCU11 appears to be low. At this time, MCU11 controls the drive motor 5 to stop running.

[0047] Therefore, the circuit status can be automatically determined by the high and low levels of the MCU11 signal input pin, thus accurately determining whether the metal wire sample 6 is broken. A 5V DC power supply can be used.

[0048] The signal acquisition module 12 also includes an RC filter circuit 13, which is located between the first terminal and the signal input terminal of the main controller 1 to filter out electromagnetic noise interference in the detection circuit. Specifically, the RC filter circuit 13 consists of a filter resistor and a filter capacitor, the parameters of which can be selected according to the actual electromagnetic interference situation. One end of the filter resistor is connected to the first terminal of the pull-down resistor, and one end of the filter capacitor is connected in series with the filter resistor, with the other end grounded. The signal input terminal of the MCU 11 is connected between the filter resistor and the filter capacitor.

[0049] The main controller 1 also includes a motor driver 14 and a counter 15. The MCU 11 is electrically connected to the drive motor 5 through the motor driver 14, which can convert the control signals output by the MCU 11 into voltage and current signals suitable for driving the motor 5.

[0050] Counter 15 is used to read the number of twists and communicate with MCU11. Counter 15 can be a Hall counter. Counter 15 is fixed on one side of turntable 21, and probe is fixed on turntable 21. Probe follows turntable 21 to swing back and forth. Hall counter 15 reads the number of swings of probe. Each swing of probe means one twist of metal wire, so the number of twists of metal wire can be accurately recorded.

[0051] In addition to using counter 15, the number of torsions can also be counted by the number of reciprocating rotations of drive motor 5.

[0052] In this application, the detection circuits of multiple test stations are relatively independent, avoiding mutual interference, thus enabling multi-station testing.

[0053] This embodiment also provides a method for testing the torsional fatigue life of a metal wire, which uses the aforementioned automated testing equipment for the torsional fatigue life of a metal wire and includes the following steps: a) Mount the metal wire sample 6 at at least two test stations of the testing equipment, and form an independent testing circuit respectively; b) Start the testing equipment, and the main controller 1 independently controls and drives each testing station to perform reciprocating torsion tests on the metal wire sample 6, and independently counts the number of torsions of the metal wire sample 6 at each station. c) The main controller 1 monitors the on / off status of each of the detection loops in parallel; d) When any detection circuit changes from a conducting state to an open state due to the breakage of its corresponding metal wire sample 6, the main controller 1 responds to the state change and performs the following operations: locks the torsion count value and torsion time corresponding to the broken metal wire sample 6 as its fatigue life, and stops the torsion movement of the test station. e) Continue with steps b) and c) at the test stations where other unbroken wire specimens 6 are located until all wire specimens 6 have broken.

[0054] The implementation principle of this embodiment is as follows: The device, through a unique detection circuit design, treats the metal wire sample 6 as a switch to control the conduction and disconnection of the detection circuit. By controlling the on / off state of the detection circuit, it accurately determines whether the metal wire sample 6 is broken, avoiding the instability and susceptibility to interference inherent in traditional sensor monitoring methods. The special structure of the clamp ensures reliable clamping and electrical connection of the metal wire. The pull-down resistor and RC filter circuit 13 of the signal acquisition module 12 improve the accuracy of signal acquisition. The reasonable configuration of the main controller 1 enables precise control of the drive motor 5 and accurate recording of the number of torsions, thereby stably and accurately detecting the torsional fatigue life of the metal wire. This provides reliable data support for the performance testing of metal materials, representing a significant improvement and enhancement compared to existing technologies.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automated testing device for the torsional fatigue life of metal wire, characterized in that, include: The fixture includes a first fixture (3) and a second fixture (4), which clamp and fix the two ends of the metal wire sample (6) respectively. The drive motor (5) is used to drive the first clamp (3) and the second clamp (4) to rotate relative to each other, thereby achieving the torsion of the metal wire sample (6); The power supply, the first clamp (3), the metal wire sample (6), and the second clamp (4) are connected in sequence to form a detection circuit; the detection circuit is in a conductive state when the metal wire sample (6) is intact and in an open state when the metal wire sample (6) is broken. The signal acquisition module (12) is connected to the detection circuit to acquire the on / off signal of the detection circuit; The main controller (1) is electrically connected to the signal acquisition module (12) to receive on / off signals; the output terminal of the main controller (1) is electrically connected to the drive motor (5); the main controller (1) controls the start and stop of the drive motor (5) through the on / off signals.

2. The automated testing equipment for the torsional fatigue life of metal wire according to claim 1, characterized in that, The signal acquisition module (12) uses a pull-down resistor. The pull-down resistor has a first end and a second end. The first end is connected to the output end of the detection circuit and the signal input end of the main controller (1), and the second end is grounded.

3. The automated testing equipment for the torsional fatigue life of metal wire according to claim 2, characterized in that, The signal acquisition module (12) also includes an RC filter circuit (13), which is located between the first end and the signal input end of the main controller (1) and is used to filter out electromagnetic noise interference in the detection circuit.

4. The automated testing equipment for the torsional fatigue life of metal wire according to claim 1, characterized in that, The first clamp (3) and the second clamp (4) both include an insulating outer clamp (31) and a conductive inner clamp (32); the outer clamp (31) includes two clamps that are rotatably connected, and the inner clamp (32) is located between the two clamps; the metal wire sample (6) is connected to the inner clamp (32); the inner clamp (32) is connected to the power supply through a wire (323).

5. The automated testing equipment for the torsional fatigue life of metal wire according to claim 4, characterized in that, The inner clamp (32) includes a clamping piece (321) disposed between two clamping plates, a plug (322) disposed on the clamping piece (321), and a wire (323); the clamping piece (321) is fixed by clamping the two clamping plates; the plug (322) is connected to the end of the metal wire sample (6); one end of the wire (323) is connected to the clamping piece (321), and the wire (323) is fixed by clamping the clamping plates, and the other end is used to connect to the power supply or the main controller (1).

6. The automated testing equipment for the torsional fatigue life of metal wire according to claim 5, characterized in that, The plug (322) extends to the horizontal side of the clip (321) and forms a hook, which is hung on the clip.

7. The automated testing equipment for the torsional fatigue life of metal wire according to claim 5, characterized in that, The end of the conductor (323) is connected to a contact piece (324), which abuts against the clamp (321); the contact piece (324) is provided with a connection hole (326), and the clamp (321) is provided with a connecting post (325) that is inserted into the connection hole (326).

8. The automated testing equipment for the torsional fatigue life of metal wire according to claim 5, characterized in that, A wire frame (23) is provided on one side of the clamp, and the wire (323) is laid along the wire frame (23).

9. The automated testing equipment for the torsional fatigue life of metal wire according to claim 1, characterized in that, The main controller (1) includes a main control unit, a motor driver (14) and a counter (15); the main control unit is an MCU (11); the MCU (11) is electrically connected to the drive motor (5) through the motor driver (14); the counter (15) is used to read the number of twists and communicates with the MCU (11).

10. A method for testing the torsional fatigue life of a metal wire, characterized in that, Using the automated testing equipment according to any one of claims 1-9, wherein the automated testing equipment has at least two testing stations, the method includes the following steps: a) Mount metal wire samples (6) at at least two test stations of the testing equipment and form independent testing circuits respectively; b) Start the test equipment, and the main controller (1) independently controls and drives each test station to perform reciprocating torsion test on the metal wire sample (6), and independently counts the number of torsions of the metal wire sample (6) at each station. c) The main controller (1) monitors the on / off status of each of the detection loops in parallel; d) When any detection circuit changes from a conducting state to an open state due to the breakage of its corresponding metal wire sample (6), the main controller (1) responds to the state change and performs the following operations: locks the torsion count value and torsion time corresponding to the broken metal wire sample (6) as its fatigue life, and stops the torsion movement of the test station. e) Continue with steps b) and c) at the test station where other unbroken wire samples (6) are located until all wire samples (6) are broken.

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