A method for detecting the fastness and surface roughness of a nickel-titanium wire for a puncture needle

Abstract

The application relates to a nickel-titanium wire fastness and surface roughness detection method for a puncture needle, and belongs to the field of nickel-titanium wire detection technology, which comprises the following steps: S1, feeding nickel-titanium wire to a workbench through a feeding mechanism on the workbench; S2, an electric resistance detection mechanism on the workbench supplies electricity to the nickel-titanium wire to detect the electric resistance of the nickel-titanium wire, a transfer mechanism on the workbench transfers the nickel-titanium wire after the electric resistance detection to a roughness detection device on the workbench, and the roughness detection device detects the surface roughness of the nickel-titanium wire; and S3, a discharging mechanism on the workbench discharges the detected nickel-titanium wire from the workbench. The application has the effect of quickly and non-destructively detecting the surface roughness and fastness of the nickel-titanium wire.

Description

Technical Field

[0001] This application relates to the field of nickel-titanium wire testing technology, and in particular to a method for testing the strength and surface roughness of nickel-titanium wire for puncture needles. Background Technology

[0002] Nickel-titanium alloy wire is widely used in medical devices, aerospace and other fields due to its unique shape memory effect and superelasticity. Its surface roughness and strength have an important impact on the performance and life of the product.

[0003] Currently, the surface roughness of nickel-titanium wire is mainly detected by non-contact methods such as optical microscopy and laser scanning. Optical microscopy analyzes the surface morphology through images, but has limited resolution. Laser scanning has high precision, but the equipment is expensive. Fastness testing mostly uses mechanical tensile tests. By applying tension to both ends of the nickel-titanium wire, if the wire does not break when the tension reaches the specified magnitude, it is a qualified product. If there are depressions or cracks on the surface of the nickel-titanium wire, it will break before the specified force is reached, and it is a defective product.

[0004] While mechanical tensile testing can accurately assess the strength of nickel-titanium wire, it is a destructive test and can only be used for sampling inspection of a small number of products. It cannot be used for rapid screening of batch products. Especially for nickel-titanium wire products used in medical devices such as puncture needles, sampling inspection is obviously insufficient to meet the pass rate requirements of medical products. Therefore, how to quickly and non-destructively test the surface roughness and strength of nickel-titanium wire has become an urgent problem to be solved. Summary of the Invention

[0005] To enable rapid and non-destructive testing of the surface roughness and fastness of nickel-titanium wire, this application provides a method for testing the fastness and surface roughness of nickel-titanium wire for puncture needles.

[0006] The method for testing the fastness and surface roughness of nickel-titanium wire for puncture needles provided in this application adopts the following technical solution:

[0007] A method for testing the fastness and surface roughness of nickel-titanium wire used in puncture needles includes the following steps:

[0008] S1: The nickel-titanium wire is fed onto the worktable via the feeding mechanism on the worktable;

[0009] S2: The resistance testing mechanism on the workbench energizes the nickel-titanium wire to test its resistance. The transfer mechanism on the workbench transfers the nickel-titanium wire with the completed resistance test to the surface roughness testing equipment on the workbench. The surface roughness testing equipment tests the surface roughness of the nickel-titanium wire.

[0010] S3: The unloading mechanism on the worktable unloads the inspected nickel-titanium wire from the worktable.

[0011] By adopting the above technical solution, since the length and diameter of the produced nickel-titanium wire are fixed, the measured resistance of the nickel-titanium wire is also fixed. If the surface roughness of the nickel-titanium wire fluctuates, the diameter of the nickel-titanium wire will change, and the measured resistance of the nickel-titanium wire will fluctuate. If the resistance fluctuation exceeds the set range, it can be determined that the nickel-titanium wire has dents or cracks. With the addition of a roughness testing device for direct detection of the surface roughness of the nickel-titanium wire, the fastness and surface roughness of the nickel-titanium wire can be detected, realizing a fast and non-destructive test of the surface roughness and fastness of the nickel-titanium wire.

[0012] Optionally, S2 further includes the following step:

[0013] S21: If the resistance of the nickel-titanium wire measured by the resistance testing mechanism is within the set range, it is a qualified product, and the feeding mechanism will feed the qualified nickel-titanium wire.

[0014] S22: If the measured resistance of the nickel-titanium wire exceeds the set range, the nickel-titanium wire is transferred to the roughness detection equipment. The roughness detection equipment uses a laser scanning mechanism to perform mechanical scanning detection on the surface roughness of the nickel-titanium wire. If the surface roughness of the nickel-titanium wire exceeds the set range, it is cut as an unqualified nickel-titanium wire. If the surface roughness of the nickel-titanium wire is within the set range, it is cut as a qualified nickel-titanium wire.

[0015] By adopting the above technical solution, if the resistance of the nickel-titanium wire measured by the resistance testing mechanism is within the set range, it means that the surface roughness and fastness of the nickel-titanium wire meet the requirements, and the nickel-titanium wire is a qualified product. The qualified nickel-titanium wire is directly cut into materials. If the measured resistance of the nickel-titanium wire exceeds the set range, the surface roughness of the nickel-titanium wire is then detected with high precision by the laser scanning mechanism to finally determine whether the nickel-titanium wire is qualified. This optimizes the detection steps for fastness and surface roughness detection of nickel-titanium wire, improves detection efficiency, and enhances the accuracy of fastness and surface roughness detection of nickel-titanium wire.

[0016] Optionally, the resistance detection mechanism includes a detection platform, electrodes, a connecting member, an ammeter, a voltmeter, and a processing unit. The detection platform is set on a workbench. Two electrodes are slidably arranged on the detection platform and are connected to a power source via wires. The connecting member is set on the detection platform and is used to drive the two electrodes closer together to abut against the two ends of the nickel-titanium wire. The ammeter is set on the detection platform and is used to detect the current passing through the nickel-titanium wire. The voltmeter is set on the detection platform and is used to detect the voltage across the nickel-titanium wire. The processing unit is set on the detection platform and is electrically connected to both the ammeter and the voltmeter. The processing unit is used to calculate the resistance of the nickel-titanium wire according to Ohm's law.

[0017] By adopting the above technical solution, after the nickel-titanium wire is fed onto the testing stage, the connecting member drives the two electrodes to approach each other, and the two electrodes respectively abut against the two ends of the nickel-titanium wire. Then, the electrodes are energized, which can energize the nickel-titanium wire. The ammeter detects the current passing through the nickel-titanium wire, and the voltmeter detects the voltage across the two ends of the nickel-titanium wire. Then, the detected data is sent to the processing unit. The processing unit can calculate the resistance of the nickel-titanium wire according to Ohm's law, which makes it convenient and quick to detect the resistance of the nickel-titanium wire.

[0018] Optionally, the feeding mechanism includes a conveyor line, a tray, a lifting assembly, and a conveying assembly. The conveyor line is set on the worktable and extends from the resistance detection mechanism to the laser scanning mechanism. The tray is set on the conveyor line and is used for inserting multiple nickel-titanium wires. The lifting assembly is set on the conveyor line and is used to lift the tray off the conveyor line. The conveying assembly is set on the worktable and is used to transfer the nickel-titanium wires on the tray to the detection table.

[0019] By adopting the above technical solution, the nickel-titanium wire to be tested is inserted into the tray, and then the tray is placed on the conveyor line. The conveyor line can then transport the tray to the testing table. The lifting component lifts the tray from the conveyor line for positioning, and the conveying component can then transfer the nickel-titanium wire on the tray to the testing table, thus conveniently completing the feeding of the nickel-titanium wire. In addition, the conveyor line can also transport the empty tray to the laser scanning mechanism, which facilitates the subsequent unloading of the laser-scanned nickel-titanium wire onto the empty tray.

[0020] Optionally, the conveying assembly includes a transverse base, a transverse component, a turntable, a rotating component, a lifting cylinder, an adjusting base, an adjusting component, a horizontal cylinder, and grippers. The transverse base is slidably mounted on the worktable along the conveying direction of the conveying line. The transverse component is mounted on the worktable and is used to drive the transverse base to move. The turntable is rotatably mounted on the transverse base. The rotating component is mounted on the transverse base and is used to drive the turntable to rotate. The lifting cylinder is vertically mounted on the turntable. The adjusting base is rotatably mounted on the piston rod of the lifting cylinder. The adjusting component is mounted on the lifting cylinder and is used to drive the adjusting base to rotate. The horizontal cylinder is horizontally mounted on the adjusting base. The grippers are mounted on the piston rod of the horizontal cylinder and are used to clamp the nickel-titanium wire.

[0021] By adopting the above technical solution, the transverse component drives the transverse seat to move to the position of the lifted tray, the rotating component drives the turntable to rotate, the turntable drives the gripper to move one of the nickel-titanium wires on the tray, the piston rods of the lifting cylinder and the horizontal cylinder extend and retract, so that the gripper moves to the clamping position of the nickel-titanium wire. After the gripper catches the nickel-titanium wire, the piston rods of the lifting cylinder and the horizontal cylinder extend and retract, the rotating component drives the turntable to rotate, the transverse component drives the transverse seat to move, so that the gripper carries the nickel-titanium wire to the detection table position, and then the adjusting component drives the adjusting seat to rotate, the adjusting seat drives the gripper to rotate, so that the gripper carries the nickel-titanium wire to a horizontal state, and then the gripper releases, so that the nickel-titanium wire is placed horizontally between the two electrodes on the detection table, and the nickel-titanium wire is conveniently reversed and loaded onto the detection table.

[0022] Optionally, the laser scanning mechanism includes a scanning base, a laser scanner, and a positioning component. The scanning base is disposed on a worktable, the laser scanner is disposed on the worktable and is used to perform circumferential scanning on the nickel-titanium wire on the scanning base, and the positioning component is disposed on the scanning base and is used to position the nickel-titanium wire.

[0023] By adopting the above technical solution, after the nickel-titanium wire is fed onto the scanning base, the positioning component positions the nickel-titanium wire, and then the laser scanner can perform circumferential scanning on the nickel-titanium wire, effectively improving the accuracy of detecting the surface roughness of the nickel-titanium wire.

[0024] Optionally, the positioning assembly includes a positioning seat, a positioning pin, and a lifting cylinder. The scanning seat has a positioning hole for vertical insertion of a nickel-titanium wire. The positioning seat is slidably mounted on the positioning seat in the direction toward the positioning hole. The positioning pin is mounted on the positioning seat and is used to pass through the hole in the middle of the nickel-titanium wire. The diameter of the positioning pin gradually increases from the direction near the nickel-titanium wire to the direction away from the nickel-titanium wire. The lifting cylinder is mounted on the positioning seat and is used to drive the positioning seat to slide.

[0025] By adopting the above technical solution, after the nickel-titanium wire is vertically inserted into the positioning hole for feeding, the piston rod of the lifting cylinder extends, causing the positioning seat to drive the positioning pin close to the nickel-titanium wire. The positioning pin, whose diameter gradually increases from close to the nickel-titanium wire to far away from the nickel-titanium wire, can be inserted into the hole in the middle of the nickel-titanium wire and lift the nickel-titanium wire out of the positioning hole. The positioning pin supports and positions the nickel-titanium wire, and the laser scanner can then inspect the circumferential surface of the nickel-titanium wire.

[0026] Optionally, the transfer mechanism includes a robotic arm and a clamping assembly. The robotic arm is mounted on a worktable, and the clamping assembly is mounted on the robotic arm and used to clamp the nickel-titanium wire.

[0027] By adopting the above technical solution, the robot arm drives the clamping component to move to the inspection table position. After the clamping component picks up the nickel-titanium wire on the inspection table, the robot arm drives the clamping component to move again, so that the nickel-titanium wire can be directly unloaded or transferred to the scanning base.

[0028] Optionally, the clamping assembly includes a reversing seat, a reversing element, and a first clamp. The reversing seat is rotatably mounted on the robotic arm, the reversing element is mounted on the robotic arm and is used to drive the reversing seat to rotate, and the first clamp is mounted on the reversing seat and is used to clamp the nickel-titanium wire.

[0029] By adopting the above technical solution, the robot arm drives the first clamp to move to the position of the nickel-titanium wire on the detection stage. After the first clamp holds the nickel-titanium wire, the robot arm drives the first clamp and the nickel-titanium wire to move towards the scanning stage. During the process, the reversing component drives the reversing seat to rotate, so that the first clamp and the nickel-titanium wire can rotate to the vertical position, and then the nickel-titanium wire can be conveniently inserted into the positioning hole on the scanning seat.

[0030] Optionally, the feeding mechanism includes a switching seat, a switching component, and a second clamp. The switching seat is rotatably mounted on the robotic arm, the clamping component is mounted on the switching seat, the switching component is mounted on the robotic arm and is used to drive the switching seat to rotate, and the second clamp is mounted on the switching seat and is used to clamp the nickel-titanium wire.

[0031] By adopting the above technical solution, when the robot arm drives the first clamp to transfer the nickel-titanium wire on the inspection table to the scanning position, the second clamp first picks up the scanned nickel-titanium wire on the scanning position, and then the switching component drives the switching position to rotate. The switching position drives the first clamp and the nickel-titanium wire to turn to the scanning position for loading, which effectively improves the efficiency of transferring the nickel-titanium wire from the inspection table to the scanning position, and also improves the efficiency of unloading the nickel-titanium wire from the scanning position.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] If the surface roughness of the nickel-titanium wire fluctuates, the diameter of the nickel-titanium wire will change, and the measured resistance of the nickel-titanium wire will fluctuate. If the resistance fluctuation exceeds the set range, it can be determined that the nickel-titanium wire has dents or cracks. By combining the surface roughness of the nickel-titanium wire with a roughness testing device for intuitive detection, the fastness and surface roughness of the nickel-titanium wire can be detected, realizing a fast and non-destructive test of the surface roughness and fastness of the nickel-titanium wire.

[0034] If the resistance of the nickel-titanium wire measured by the resistance testing mechanism is within the set range, it means that the surface roughness and fastness of the nickel-titanium wire meet the requirements, and the nickel-titanium wire is a qualified product. The qualified nickel-titanium wire is directly cut into materials. If the measured resistance of the nickel-titanium wire exceeds the set range, the surface roughness of the nickel-titanium wire is then tested with high precision by a laser scanning mechanism to finally determine whether the nickel-titanium wire is qualified. This optimizes the testing steps for fastness and surface roughness testing of nickel-titanium wire and improves testing efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the method for detecting the fastness and surface roughness of the nickel-titanium wire used for puncture needles according to an embodiment of this application;

[0036] Figure 2 This is a structural schematic diagram from another perspective of an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the structure of the laser scanning mechanism according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the clamping assembly and unloading mechanism according to an embodiment of this application.

[0039] Reference numerals: 1. Workbench; 2. Loading mechanism; 21. Conveyor line; 22. Pallet; 23. Lifting assembly; 24. Conveying assembly; 241. Transverse seat; 242. Transverse component; 243. Turntable; 244. Lifting cylinder; 245. Adjusting seat; 246. Adjusting component; 247. Horizontal cylinder; 248. Gripper; 3. Resistance detection mechanism; 31. Detection table; 32. Electrode; 4. Transfer mechanism; 41. Robot arm; 42. Clamping assembly; 421. Reversing seat; 422. Reversing component; 423. First clamp; 5. Laser scanning mechanism; 51. Scanning seat; 52. Laser scanner; 53. Positioning assembly; 531. Positioning seat; 532. Positioning pin; 533. Lifting cylinder; 6. Unloading mechanism; 61. Switching seat; 62. Switching component; 63. Second clamp. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail.

[0041] This application discloses a method for testing the strength and surface roughness of nickel-titanium wire used for puncture needles.

[0042] Reference Figure 1 The method for testing the fastness and surface roughness of puncture needles using nickel-titanium wire includes the following steps:

[0043] S1: The nickel-titanium wire is fed onto the worktable 1 by the feeding mechanism 2 on the worktable 1;

[0044] S2: The resistance detection mechanism 3 on the workbench 1 energizes the nickel-titanium wire to detect its resistance. The transfer mechanism 4 on the workbench 1 transfers the nickel-titanium wire after resistance detection to the roughness detection device on the workbench 1. The roughness detection device detects the surface roughness of the nickel-titanium wire.

[0045] S21: If the resistance of the nickel-titanium wire measured by the resistance detection mechanism 3 is within the set range, it is a qualified product, and the feeding mechanism 6 will feed the qualified nickel-titanium wire.

[0046] S22: If the measured resistance of the nickel-titanium wire exceeds the set range, the nickel-titanium wire is transferred to the roughness detection equipment. The roughness detection equipment uses a laser scanning mechanism 5 to perform mechanical scanning detection on the surface roughness of the nickel-titanium wire. If the surface roughness of the nickel-titanium wire exceeds the set range, it is cut as an unqualified nickel-titanium wire. If the surface roughness of the nickel-titanium wire is within the set range, it is cut as a qualified nickel-titanium wire.

[0047] S3: The unloading mechanism 6 on the workbench 1 unloads the inspected nickel-titanium wire from the workbench 1.

[0048] Reference Figure 1 , Figure 2 The feeding mechanism 2 includes a conveyor line 21, a tray 22, a lifting assembly 23, and a conveying assembly 24. The conveyor line 21 is installed on one side of the workbench 1 and extends from the resistance detection mechanism 3 toward the laser scanning mechanism 5. In this embodiment, the middle part of the conveyor line 21 is hollow. The tray 22 is placed on the conveyor line 21 and has multiple insertion holes arranged in an array on the tray 22. Each insertion hole is used for vertical insertion of a nickel-titanium wire. The lifting assembly 23 is installed on the conveyor line 21 at the feeding position and the unloading position, respectively. The lifting assembly 23 is used to lift the tray 22 off the conveyor line 21. In this embodiment, the lifting assembly 24 is used to lift the tray 22 off the conveyor line 21. The lifting assembly 23 includes a lifting cylinder, a lifting plate, and lifting blocks. The lifting cylinder is vertically mounted on the conveyor line 21. The lifting plate is mounted on the piston rod of the lifting cylinder. Multiple lifting blocks are mounted on the side of the lifting plate facing the tray 22. The diameter of the lifting blocks gradually increases from the direction away from the lifting plate to the direction closer to the lifting plate. Multiple holes corresponding to the lifting blocks are opened on the side of the tray 22 near the lifting plate. The piston rod of the lifting cylinder extends, causing the lifting plate to move the multiple lifting blocks upward. The multiple lifting blocks can then be inserted into the multiple holes at the bottom of the tray 22, lifting the tray 22 off the conveyor line 21 and positioning the tray 22 for subsequent handling of nickel-titanium wire.

[0049] Reference Figure 1 , Figure 2The conveying assembly 24 is mounted on the workbench 1. The conveying assembly 24 is used to transfer the nickel-titanium wire from the tray 22 to the resistance detection mechanism 3. The conveying assembly 24 includes a transverse base 241, a transverse component 242, a turntable 243, a rotating component, a lifting cylinder 244, an adjusting base 245, an adjusting component 246, a horizontal cylinder 247, and a gripper 248. The transverse base 241 is slidably mounted on the workbench 1 along the conveying direction of the conveyor line 21. The transverse component 242 is mounted on the workbench 1 and is used to drive the transverse base 241 to slide. In this embodiment, the transverse component 242 is a cylinder, mounted on the workbench 1, and the piston rod of the cylinder is connected to the transverse base 241. The turntable 243 is horizontally rotatably mounted on the transverse base 241, and the rotating component is mounted on the transverse base 241. The rotating component is used to drive the turntable 243 to rotate. In this embodiment, the rotating component is a servo motor, mounted on the transverse base 241. On the 1st floor, the output shaft of the servo motor is coaxially connected to the turntable 243; the lifting cylinder 244 is vertically mounted on the turntable 243, the adjusting seat 245 is rotatably mounted on the piston rod of the lifting cylinder 244 in a direction perpendicular to the rotation direction of the turntable 243, and the adjusting component 246 is mounted on the lifting cylinder 244. The adjusting component 246 is used to drive the adjusting seat 245 to rotate. In this embodiment, the adjusting component 246 is a servo motor; the horizontal cylinder 247 is horizontally mounted on the adjusting seat 245, and the gripper 248 is mounted on the piston rod of the horizontal cylinder 247. The gripper 248 is used to clamp the nickel-titanium wire. In this embodiment, the gripper 248 includes a double-headed cylinder and two clamping plates. The double-headed cylinder is mounted on the piston rod of the horizontal cylinder 247, and the two clamping plates are respectively mounted on the two piston rods of the double-headed cylinder. The extension and retraction of the piston rod of the double-headed cylinder can drive the two clamping plates to move towards each other, thereby clamping or releasing the nickel-titanium wire.

[0050] The operator inserts multiple nickel-titanium wires to be tested into the various holes on the tray 22, then places the tray 22 on the conveyor line 21. The conveyor line 21 is then started, and it transports the tray 22 for loading. When the tray 22 reaches the loading position near the resistance testing mechanism 3, the lifting assembly 23 lifts the tray 22 off the conveyor line 21 for positioning. Then, the transverse component 242 drives the transverse seat 241 to move, the rotating component drives the turntable 243 to rotate, and the adjusting component 246 drives the adjusting seat 245 to rotate, causing the gripper 248 to move to the position of a nickel-titanium wire. The piston rod of the lifting cylinder 244 retracts, and the piston rod of the horizontal cylinder 247 extends and retracts, causing the two clamping plates of the gripper 248 to move towards the nickel-titanium wire. On both sides, after the grippers 248 clamp the nickel-titanium wire, the piston rod of the lifting cylinder 244 extends, causing the grippers 248 to lift the nickel-titanium wire. With the drive of the transverse component 242, the rotating component and the horizontal cylinder 247, the grippers 248 move the nickel-titanium wire to the resistance detection mechanism 3. The adjusting component 246 then drives the adjusting seat 245 to rotate, causing the grippers 248 to rotate the nickel-titanium wire to a horizontal state. The grippers 248 then release, and the nickel-titanium wire can be conveniently placed horizontally on the resistance detection mechanism 3. The empty tray 22 after taking the material can also be transported by the conveyor line 21 to the position of unloading the nickel-titanium wire. Then the lifting component 23 lifts the empty tray 22 for positioning, so that the unloading mechanism 6 can unload the tested nickel-titanium wire.

[0051] Reference Figure 1 , Figure 2The resistance detection mechanism 3 includes a detection platform 31, electrodes 32, a connecting member, an ammeter, a voltmeter, and a processing unit. The detection platform 31 is mounted on the workbench 1. In this embodiment, a positioning groove is horizontally formed on the detection platform 31, allowing the nickel-titanium wire to be placed in the positioning groove, thus improving the stability of the nickel-titanium wire during the detection process. A placement groove is also formed on the detection platform 31 along its length perpendicular to the positioning groove, allowing the gripper 248 to extend into the placement groove when holding the nickel-titanium wire, thus better placing the wire in the positioning groove. Two electrodes 32 are slidably mounted on the detection platform 31. Both electrodes 32 are connected to a power source via wires. The two electrodes 32 are located on opposite sides of the positioning groove. The connecting member is mounted on the detection platform 31 and is used to drive the two electrodes. The electrodes 32 are brought close together. In this embodiment, the connecting element is a double-headed cylinder, which is mounted on the detection platform 31. The two piston rods of the double-headed cylinder are respectively connected to the two electrodes 32. An ammeter is mounted on the detection platform 31 and is electrically connected to the wire connecting the electrodes 32, so as to detect the current passing through the nickel-titanium wire. A voltmeter is mounted on the detection platform 31 and is electrically connected to the wire connecting both electrodes 32, so as to detect the voltage across the nickel-titanium wire. In this embodiment, a sliding rheostat is also electrically connected in the circuit composed of the power supply, the two electrodes 32, and the nickel-titanium wire to improve the safety of the circuit. A processing unit is mounted on the detection platform 31 and is electrically connected to both the ammeter and the voltmeter. The processing unit is used to calculate the resistance of the nickel-titanium wire according to Ohm's law.

[0052] The gripper 248 places the nickel-titanium wire on the detection stage 31. The connecting member drives the two electrodes 32 to approach each other, so that the two electrodes 32 can respectively abut against the two ends of the nickel-titanium wire. Then, the power supply is connected to energize the two electrodes 32, and the two electrodes 32 and the nickel-titanium wire can form a circuit. The ammeter can detect the current passing through the nickel-titanium wire, and the voltmeter can detect the voltage across the two ends of the nickel-titanium wire. The ammeter and voltmeter transmit the detected current and voltage to the processing unit. The processing unit can measure the resistance of the nickel-titanium wire according to Ohm's law, which is convenient and quick to detect the resistance of the nickel-titanium wire.

[0053] Reference Figure 1 , Figure 3The laser scanning mechanism 5 includes a scanning base 51, a laser scanner 52, and a positioning component 53. The scanning base 51 is mounted on the worktable 1, and a positioning hole is vertically provided on the scanning base 51 for vertical insertion of a nickel-titanium wire. The laser scanner 52 is mounted on the worktable 1 and is used to perform circumferential scanning on the nickel-titanium wire on the scanning base 51. The positioning component 53 is mounted on the scanning base 51 and is used to position the nickel-titanium wire. The positioning component 53 includes a positioning seat 531, a positioning pin 532, and a lifting cylinder 533. The positioning seat 531 is vertically slidably mounted on the positioning base 531. The positioning pin 532 is mounted on the positioning base 531, and the diameter of the positioning pin 532 gradually increases from the direction close to the nickel-titanium wire to the direction far away from the nickel-titanium wire. The positioning pin 532 is used to pass through the hole in the middle of the nickel-titanium wire. The lifting cylinder 533 is vertically mounted on the positioning base 531, and the piston rod of the lifting cylinder 533 is connected to the positioning base 531.

[0054] When the nickel-titanium wire is fed onto the scanning base 51, it is driven to be vertically inserted into the positioning hole on the scanning base 51. Then, the piston rod of the lifting cylinder 533 extends, driving the positioning base 531 to move the positioning pin 532 toward the nickel-titanium wire. The smaller diameter end of the positioning pin 532 is first inserted into the hole in the middle of the nickel-titanium wire. As the positioning base 531 continues to move, the larger diameter part of the positioning pin 532 can press against the inner wall of the hole in the middle of the nickel-titanium wire, and push the nickel-titanium wire out of the positioning hole, thereby supporting and positioning the nickel-titanium wire. Then, the laser scanner 52 can scan the nickel-titanium wire. During scanning, the surface of the nickel-titanium wire is unobstructed, improving the scanning accuracy and thus effectively improving the accuracy of detecting the surface roughness of the nickel-titanium wire.

[0055] Reference Figure 2 , Figure 4 The transfer mechanism 4 includes a robotic arm 41 and a clamping assembly 42. The robotic arm 41 is mounted on the worktable 1. The unloading mechanism 6 is mounted on the robotic arm 41. The unloading mechanism 6 includes a switching seat 61, a switching element 62, and a second clamp 63. The switching seat 61 is rotatably mounted on the robotic arm 41, and the switching element 62 is mounted on the robotic arm 41. The switching element 62 is used to drive the switching seat 61 to rotate. In this embodiment, the switching element 62 is a servo motor. The second clamp 63 is mounted on the switching seat 61 and is used to clamp the nickel-titanium wire. In this embodiment, the second clamp 63 includes a linear cylinder, a double-headed cylinder, and two clamping plates. The linear cylinder is mounted on the switching seat 61, the double-headed cylinder is mounted on the piston rod of the linear cylinder, and the two clamping plates are respectively mounted on the two piston rods of the double-headed cylinder.

[0056] Reference Figure 2 , Figure 4The clamping assembly 42 is mounted on the robotic arm 41. The clamping assembly 42 is used to clamp the nickel-titanium wire. The clamping assembly 42 includes a reversing seat 421, a reversing element 422, and a first clamp 423. The reversing seat 421 is rotatably mounted on the switching seat 61. The reversing element 422 is mounted on the switching seat 61 and is used to drive the reversing seat 421 to rotate. In this embodiment, the reversing element 422 is a servo motor. The first clamp 423 is mounted on the reversing seat 421 and is used to clamp the nickel-titanium wire. In this embodiment, the first clamp 423 also includes a linear cylinder, a double-headed cylinder, and two clamping plates.

[0057] After the resistance of the nickel-titanium wire is tested on the testing table 31, if it passes the test, the robot arm 41 drives the unloading mechanism 6 to move to the testing table 31. The second clamp 63 then clamps the nickel-titanium wire on the testing table 31. The robot arm 41 then drives the second clamp 63 to lift the nickel-titanium wire. Then, the switching component 62 drives the switching seat 61 to rotate. The switching seat 61 drives the second clamp 63 and the nickel-titanium wire to rotate, thus adjusting the clamped nickel-titanium wire to a vertical position. Then, the robot arm 41 drives the second clamp 63 to insert the nickel-titanium wire into the empty position on the tray 22 on the conveyor line 21. If the resistance fluctuation of the nickel-titanium wire tested on the testing table 31 exceeds the set range, the robot arm 41 drives the first clamp 423 to move to the testing table 31. After the first clamp 423 clamps the nickel-titanium wire, the robot arm 41 then drives the first clamp 423 and the second clamp 63 to move... The device moves to the scanning base 51. The switching element 62 drives the switching base 61 to rotate, adjusting the second clamp 63 to a vertical clamping position for the nickel-titanium wire. Then, the reversing element 422 drives the reversing base 421 to rotate, causing the reversing base 421 to rotate the first clamp 423 and the nickel-titanium wire to a horizontal position. The reversing element 422 also drives the linear cylinder of the first clamp 423 to extend, so that the nickel-titanium wire held by the first clamp 423 avoids the nickel-titanium wire on the scanning base 51. After the second clamp 63 picks up the nickel-titanium wire from the scanning base 51, the switching element 62 drives the switching base 61 to rotate again. With the drive of the robot arm 41, the nickel-titanium wire held by the first clamp 423 is inserted into the scanning base 51. Then, the robot arm 41 drives the second clamp 63 to move, so that the nickel-titanium wire held by the second clamp 63 is inserted into the empty position on the tray 22 on the conveyor line 21 for unloading.

[0058] The implementation principle of the method for testing the fastness and surface roughness of nickel-titanium wire for puncture needles in this application embodiment is as follows: Since the length and diameter of the mass-produced nickel-titanium wires are of the same specification, the length and diameter of the nickel-titanium wires are constant. The feeding mechanism 2 feeds the nickel-titanium wires onto the testing table 31. The two electrodes 32 abut against the two ends of the nickel-titanium wires. When the resistance of the nickel-titanium wires is tested by energizing, the measured resistance of the nickel-titanium wires is constant. If the resistance of the nickel-titanium wires measured by the resistance testing mechanism 3 is within the set range, it indicates that the surface of the nickel-titanium wires is smooth or that the existing dents and cracks are within the qualified range. The surface roughness and fastness of the nickel-titanium wires are both qualified, and the nickel-titanium wires are qualified products. The unloading mechanism 6 unloads the qualified nickel-titanium wires. Titanium wire feeding; if the measured resistance fluctuation of the nickel-titanium wire exceeds the set range, it indicates that the diameter of the nickel-titanium wire has changed, and the measured nickel-titanium wire has dents or cracks. The transfer mechanism 4 then transfers the nickel-titanium wire from the detection table 31 to the scanning seat 51. The laser scanning mechanism 5 then performs high-precision detection on the surface roughness of the nickel-titanium wire to finally determine whether the nickel-titanium wire is qualified. If it is still unqualified, the nickel-titanium wire is fed as scrap. If it is qualified, it is fed onto the tray 22. The detection steps for the fastness and surface roughness detection of nickel-titanium wire are optimized, the detection efficiency is improved, and full inspection of the produced nickel-titanium wire can be realized, realizing fast and non-destructive detection of the surface roughness and fastness of nickel-titanium wire.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for testing the fastness and surface roughness of nickel-titanium wire used in puncture needles, characterized in that: Includes the following steps: S1: The nickel-titanium wire is fed onto the worktable (1) by the feeding mechanism (2) on the worktable (1); S2: The resistance detection mechanism (3) on the workbench (1) energizes the nickel-titanium wire to detect its resistance. The transfer mechanism (4) on the workbench (1) transfers the nickel-titanium wire that has completed the resistance detection to the roughness detection device on the workbench (1). The roughness detection device detects the surface roughness of the nickel-titanium wire. S2 further includes the following steps: S21: If the resistance of the nickel-titanium wire measured by the resistance detection mechanism (3) is within the set range, it is a qualified product, and the feeding mechanism (6) feeds the qualified nickel-titanium wire. S22: If the measured resistance of the nickel-titanium wire exceeds the set range, the nickel-titanium wire will be transferred to the roughness detection equipment. The roughness detection equipment uses a laser scanning mechanism (5) to perform laser scanning detection on the surface roughness of the nickel-titanium wire. If the surface roughness of the nickel-titanium wire exceeds the set range, it will be cut as an unqualified nickel-titanium wire. If the surface roughness of the nickel-titanium wire is within the set range, it will be cut as a qualified nickel-titanium wire. The laser scanning mechanism (5) includes a scanning base (51), a laser scanner (52), and a positioning component (53). The scanning base (51) is set on the worktable (1), the laser scanner (52) is set on the worktable (1) and is used to perform circumferential scanning on the nickel-titanium wire on the scanning base (51), and the positioning component (53) is set on the scanning base (51) and is used to position the nickel-titanium wire. The positioning component (53) includes a positioning seat (531), a positioning pin (532), and a lifting cylinder (533). The scanning seat (51) has a positioning hole for vertical insertion of a nickel-titanium wire. The positioning seat (531) is slidably disposed on the positioning seat (531) in the direction toward the positioning hole. The positioning pin (532) is disposed on the positioning seat (531) and is used to pass through the hole in the middle of the nickel-titanium wire. The diameter of the positioning pin (532) gradually increases from the direction close to the nickel-titanium wire to the direction away from the nickel-titanium wire. The lifting cylinder (533) is disposed on the positioning seat (531) and is used to drive the positioning seat (531) to slide. S3: The unloading mechanism (6) on the workbench (1) unloads the tested nickel-titanium wire from the workbench (1).

2. The method for testing the strength and surface roughness of nickel-titanium wire for puncture needles according to claim 1, characterized in that: The resistance detection mechanism (3) includes a detection platform (31), electrodes (32), a connecting member, an ammeter, a voltmeter, and a processing unit. The detection platform (31) is set on the workbench (1). Two electrodes (32) are slidably arranged on the detection platform (31). The two electrodes (32) are connected to the power supply through wires. The connecting member is set on the detection platform (31) and is used to drive the two electrodes (32) to approach each other and abut against the two ends of the nickel-titanium wire. The ammeter is set on the detection platform (31) and is used to detect the current passing through the nickel-titanium wire. The voltmeter is set on the detection platform (31) and is used to detect the voltage across the two ends of the nickel-titanium wire. The processing unit is set on the detection platform (31) and is electrically connected to both the ammeter and the voltmeter. The processing unit is used to calculate the resistance of the nickel-titanium wire according to Ohm's law.

3. The method for testing the strength and surface roughness of nickel-titanium wire for puncture needles according to claim 1, characterized in that: The feeding mechanism (2) includes a conveyor line (21), a tray (22), a lifting assembly (23), and a conveying assembly (24). The conveyor line (21) is set on the workbench (1) and extends from the resistance detection mechanism (3) to the laser scanning mechanism (5). The tray (22) is set on the conveyor line (21) and is used for inserting multiple nickel-titanium wires. The lifting assembly (23) is set on the conveyor line (21) and is used to lift the tray (22) off the conveyor line (21). The conveying assembly (24) is set on the workbench (1) and is used to transfer the nickel-titanium wires on the tray (22) to the detection table (31).

4. The method for testing the strength and surface roughness of nickel-titanium wire for puncture needles according to claim 3, characterized in that: The conveying assembly (24) includes a transverse base (241), a transverse component (242), a turntable (243), a rotating component, a lifting cylinder (244), an adjusting base (245), an adjusting component (246), a horizontal cylinder (247), and a gripper (248). The transverse base (241) is slidably mounted on the worktable (1) along the conveying direction of the conveying line (21). The transverse component (242) is mounted on the worktable (1) and is used to drive the transverse base (241) to move. The turntable (243) is rotatably mounted on the transverse base (241). The moving part is mounted on the transverse seat (241) and is used to drive the turntable (243) to rotate. The lifting cylinder (244) is vertically mounted on the turntable (243). The adjusting seat (245) is rotatably mounted on the piston rod of the lifting cylinder (244). The adjusting part (246) is mounted on the lifting cylinder (244) and is used to drive the adjusting seat (245) to rotate. The horizontal cylinder (247) is horizontally mounted on the adjusting seat (245). The gripper (248) is mounted on the piston rod of the horizontal cylinder (247) and is used to clamp the nickel-titanium wire.

5. The method for testing the strength and surface roughness of nickel-titanium wire for puncture needles according to claim 1, characterized in that: The transfer mechanism (4) includes a robotic arm (41) and a clamping assembly (42). The robotic arm (41) is mounted on the worktable (1), and the clamping assembly (42) is mounted on the robotic arm (41) and is used to clamp the nickel-titanium wire.

6. The method for testing the strength and surface roughness of nickel-titanium wire for puncture needles according to claim 5, characterized in that: The clamping assembly (42) includes a reversing seat (421), a reversing element (422), and a first clamp (423). The reversing seat (421) is rotatably mounted on the robot arm (41). The reversing element (422) is mounted on the robot arm (41) and is used to drive the reversing seat (421) to rotate. The first clamp (423) is mounted on the reversing seat (421) and is used to clamp the nickel-titanium wire.

7. The method for testing the strength and surface roughness of nickel-titanium wire for puncture needles according to claim 6, characterized in that: The feeding mechanism (6) includes a switching seat (61), a switching component (62), and a second clamp (63). The switching seat (61) is rotatably mounted on the robot arm (41). The clamping component (42) is mounted on the switching seat (61). The switching component (62) is mounted on the robot arm (41) and is used to drive the switching seat (61) to rotate. The second clamp (63) is mounted on the switching seat (61) and is used to clamp the nickel-titanium wire.

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