Precise memory alloy wire tensile test device
Through the design of adjustment components and tensile components, the problem that existing devices cannot adapt to precision memory alloy wires of different lengths is solved, and stable clamping and efficient and accurate tensile tests are achieved, which are suitable for various application scenarios.
Patent Information
- Application Number
- CN202510596799.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2025-07-29
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing tensile testing devices cannot flexibly adapt to precision memory alloy wires of different lengths, resulting in unstable clamping of short wires and messy long wires, affecting the test process and data accuracy.
The adjustment assembly and the stretching assembly are adopted to adjust the tensile length through threaded rods and adjusting blocks, and combined with the winding fixing rods and pressure sensors, stable clamping and stretching of alloy wires of different lengths is achieved.
The stable clamping and tensile of precision memory alloy wires of different lengths is achieved, which improves the stability and accuracy of the test, and can conduct tensile tests of multiple alloy wires at the same time, and the data is more accurate.
Smart Images
Figure CN120385576A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of precision memory alloy wire testing technology. Specifically, it relates to a device for tensile testing of precision memory alloy wire. Background Art
[0002] With the continuous improvement of the requirements for material properties in cutting-edge fields such as aerospace and biomedicine, precision memory alloy wire has gradually become a key basic material due to its unique shape memory effect and superelastic properties. Before actual application, it is an indispensable step to conduct tensile tests on it to obtain accurate mechanical property parameters. Tensile testing is to apply tension, that is, external force, to the material to cause tensile deformation of the material along the axial direction. By measuring relevant parameters such as stress and strain of the material during this process, the mechanical properties of the material are analyzed. However, the following problems have emerged in the operation of current traditional tensile testing devices.
[0003] Existing devices generally use a direct clamping method to fix both ends of the alloy wire, and their structural design lacks a flexible adaptation mechanism for the length of the wire. For shorter wires, the device often cannot perform effective clamping, resulting in the tensile testing device being unable to conduct tensile tests on precision memory alloy wire; when dealing with longer wires, not only do the redundant parts often appear scattered and messy, interfering with the test process, but also the tensile stroke and adjustment range of the device itself are very limited, making it difficult to meet the complete tensile requirements of long-sized wires. If the test is forced to be carried out, it may cause the wire to exceed the effective range of the device and be unable to complete the full tensile process, resulting in errors in the test data and being unable to truly reflect the mechanical properties of the material. Summary of the Invention
[0004] To solve the above technical problems, the present invention provides a device for tensile testing of precision memory alloy wire.
[0005] The technical solution is as follows:
[0006] A device for tensile testing of precision memory alloy wire includes a test workbench. A protective cover is fixedly connected to the top of the test workbench. A plurality of heaters are fixedly connected to the top inner wall of the protective cover. An adjustment component is arranged on the top of the test workbench;
[0007] The adjustment component includes an adjustment groove opened on the top of the test workbench. Fixed frames are fixedly connected to both ends of the top of the test workbench. A threaded rod is rotatably connected between the two fixed frames. One end of the threaded rod passes through one of the fixed frames and is fixedly connected to a fixed seat. A turning handle is rotatably connected to the fixed seat. One end of the turning handle away from the fixed seat is rotatably connected to a handle. A clamping groove is opened at the bottom of the test workbench near the handle. Two adjustment blocks are threadedly connected to the threaded rod.
[0008] Further, the two fixing brackets correspond to the two ends of the adjustment groove. Both ends of the threaded rod pass through the two fixing brackets respectively. The outer surface of the handle is provided with a rough rubber layer. The handle is embedded inside the card slot. The bottoms of the two adjustment blocks slide inside the adjustment groove.
[0009] Further, a centering block is fixedly connected to the middle of the upper surface of the test workbench. The thread on the threaded rod is a double - thread.
[0010] Further, stretching components are arranged on the tops of the two adjustment blocks. The stretching components include two fixing platforms fixedly connected to the tops of the two adjustment blocks. A group of support plates are fixedly connected to the tops of the two fixing platforms respectively. There are two support plates in each group. Bearings are arranged inside the two support plates on the same side of the two groups. A driving module is fixedly connected inside each of the two bearings. The driving modules are each composed of a stepping motor, a ball screw, a telescopic rod and other components.
[0011] Further, the stretching components further include two rotating blocks fixedly connected to the two driving modules. A group of convex rods are fixedly connected to both sides of the rotating blocks. Fixed rods are slidably connected to the convex rods. Springs are sleeved on the convex rods. The two ends of the springs are respectively fixedly connected to one end of the convex rod away from the rotating block and the fixed rod.
[0012] Further, the cross - section of each fixed rod is semicircular. One end of each fixed rod away from the rotating block is set as an inclined surface. One side of each fixed rod close to each other is a plane and is roughened. One side of each fixed rod away from each other is an arc surface. A plurality of limiting strips are fixedly connected to the arc surface of each fixed rod. A pressure sensor is arranged on the arc surface of each fixed rod.
[0013] Further, the stretching components further include servo motors fixedly connected to the two groups of support plates. Limiting groove blocks are fixedly connected to the output shafts of the servo motors.
[0014] Further, the limiting groove blocks correspond to the ends of the fixed rods away from the rotating blocks. V - shaped grooves are opened on the surfaces of the limiting groove blocks close to the fixed rods.
[0015] As described above, the beneficial effects of a device for a precision shape - memory alloy wire stretching test in the present invention are as follows:
[0016] By adjusting the distance between the two adjustment blocks, the stretching components can perform stretching tests on precision shape - memory alloy wires of different lengths. The stretching length can be flexibly adjusted according to the length of the precision shape - memory alloy wire. Tests can be carried out on alloy wires of various lengths. For example, short shape - memory alloy wires used for micro - instruments in the medical field and relatively long shape - memory alloy wires used in large - scale structures such as aerospace can both be subjected to appropriate stretching tests, ensuring that the tests can cover alloy wires in different application scenarios, so as to more comprehensively master their performance characteristics.
[0017] The rotation of the threaded rod is prevented by the clamping connection between the handle and the clamping groove, so as to lock the position of the adjusting block after adjustment, ensure the stability of the adjusted position of the adjusting block, avoid the position deviation after adjusting the position of the adjusting block, and further ensure the stability of the stretching of the precision memory alloy wire by the stretching component;
[0018] By the fixing method of winding around the fixing rod, the precision memory alloy wires with different lengths can be fixed. Compared with the existing method of directly fixing by clamps, there will be no situation where the redundant precision memory alloy wires are scattered. At the same time, it can also avoid the influence on the stretching test of the scattered precision memory alloy wires. At the same time, the precision memory alloy wires wound around the fixing rod will rub against each other, and compared with the existing method of directly clamping the precision memory alloy wires, it can avoid the loosening of the fixed precision memory alloy wires, thus ensuring the stability of the stretching test of the precision memory alloy wires;
[0019] By simultaneously conducting the stretching test on multiple precision memory alloy wires, the stretching test efficiency of the precision memory alloy wires with different alloy materials can be improved. Because the stretching test can be carried out simultaneously, the test data can be more accurate compared with the test of single precision memory alloy wires one by one. There will be no situation where the stretching force is adjusted incorrectly when replacing a single precision memory alloy wire, improving the accuracy of the stretching test of the precision memory alloy wires. Description of the Drawings
[0020] Figure 1 Schematic three-dimensional diagram of the overall components of the present invention;
[0021] Figure 2 Schematic three-dimensional diagram of the protective cover and heater components of the present invention;
[0022] Figure 3 Schematic three-dimensional diagram of the adjusting groove, threaded rod, adjusting block and other components of the present invention;
[0023] Figure 4 Schematic cross-sectional three-dimensional diagram of the threaded rod, fixing bracket and other components of the present invention;
[0024] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the component at position A in
[0025] Figure 6 Schematic three-dimensional diagram of the rotary handle, handle, clamping groove and other components of the present invention;
[0026] Figure 7 Schematic three-dimensional diagram of the adjusting block, electric cylinder, servo motor and other components of the present invention;
[0027] Figure 8Schematic cross-sectional three-dimensional view of components such as the electric cylinder, clamping rod, and limit groove block of the present invention;
[0028] Figure 9 Schematic three-dimensional view of components such as the rotating block, spring, and clamping rod of the present invention.
[0029] Among them, the reference numerals in the present invention are as follows:
[0030] 1. Test workbench; 2. Protective cover; 21. Heater;
[0031] Adjusting assembly: 31. Adjusting groove; 32. Fixed frame; 33. Threaded rod; 34. Fixed seat; 35. Rotating handle; 36. Handle; 37. Card slot; 38. Adjusting block;
[0032] Tensile assembly: 41. Fixed table; 42. Support plate; 43. Bearing; 44. Driving module; 45. Rotating block; 451. Convex rod; 46. Fixed rod; 47. Spring; 48. Servo motor; 49. Limit groove block. Detailed implementation manners
[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0034] The embodiments provided by the present invention will be elaborated in detail below:
[0035] As Figures 1 to 7 shown, a device for a precision shape memory alloy wire tensile test includes a test workbench 1. A protective cover 2 is fixedly connected to the top of the test workbench 1. The cross-section of the protective cover 2 is semi-circular, which can protect the top of the test workbench 1 and improve the safety of the precision shape memory alloy wire tensile test. A plurality of heaters 21 are fixedly connected to the top inner wall of the protective cover 2. In addition, heat dissipation can be reduced through the protective cover 2 to ensure that the heaters 21 can stably heat the temperature on the test workbench 1 to an appropriate temperature. A regulating assembly for adjusting the tensile distance of the precision shape memory alloy wire is arranged on the top of the test workbench 1;
[0036] The adjustment assembly includes an adjustment slot 31 opened on the top of the test workbench 1, and both ends of the top of the test workbench 1 are fixedly connected to a fixing bracket 32, and the two fixing brackets 32 correspond to the two ends of the adjustment slot 31, and a threaded rod 33 is rotatably connected between the two fixing brackets 32, and the two ends of the threaded rod 33 pass through the two fixing brackets 32 respectively, and the threaded rod 33 passes through one end of one of the fixing brackets 32 and is fixedly connected to a fixing seat 34, and a turning handle 35 is rotatably connected to the fixing seat 34, and the turning handle 35 is rotatably connected to the handle 36 at the end away from the fixing seat 34. The outer surface of the handle 36 is provided with a rough rubber layer, which is used to increase the friction with the handle 36 when manually held, thereby facilitating the removal of the handle 36. A slot 37 is provided at the bottom of the test workbench 1 and at one end close to the handle 36. The bottom of the slot 37 is open, and the handle 36 is embedded in the inside of the slot 37. Two adjustment blocks 38 are threadedly connected to the threaded rod 33, and the bottoms of the two adjustment blocks 38 slide inside the adjustment slot 31.
[0037] It should be noted that a centering block is fixedly connected to the middle of the upper surface of the test workbench 1, and the threaded rod 33 passes through the centering block and is rotatably connected to the centering block. The centering block is used to mark the center position and provide stable support for the middle of the threaded rod 33. The thread on the threaded rod 33 is a bidirectional thread, which can drive the two adjustment blocks 38 to synchronously approach or move away from the centering block inside the adjustment slot 31 during the rotation of the threaded rod 33.
[0038] The tops of the two adjustment blocks 38 are both provided with stretching components for clamping, winding and stretching the precision memory alloy wire.
[0039] Among them, when it is necessary to adjust the position of the adjusting block 38, the staff pulls the turning handle 35, so that the turning handle 35 flips upward 180 degrees on the fixing seat 34. During the flipping process of the turning handle 35, the handle 36 will be driven to disengage from the slot 37. At this time, due to the flipping of the turning handle 35, the handle 36 will be located on the side of the turning handle 35 away from the threaded rod 33. Then the staff holds the handle 36. At this time, the staff drives the turning handle 35 to rotate with the fixing seat 34 as the axis through the handle 36. The rotation of the turning handle 35 will drive the threaded rod 33 to rotate between the two fixing frames 32 through the fixing seat 34. By rotating the threaded rod 33, the adjusting block 38 can be driven to move horizontally in the adjusting slot 31. At this time, the two adjusting blocks 38 will move away or approach synchronously. By adjusting the distance between the two adjusting blocks 38, the tensile assembly can perform tensile tests on precision memory alloy wires of different lengths. The tensile length can be flexibly adjusted according to the length of the precision memory alloy wire, and alloy wires of various lengths can be tested. For example, short memory alloy wires used in micro-devices in the medical field, as well as relatively long memory alloy wires used in large structures such as aerospace, can undergo appropriate tensile tests to ensure that the tests can cover the alloy wire conditions in different application scenarios, thereby more comprehensively understanding their performance characteristics.
[0040] After adjusting the spacing of the adjusting block 38, at this time, the rotary handle 35 needs to be placed vertically upward, and then the staff pulls the rotary handle 35, so that the rotary handle 35 rotates 180 degrees downward on the fixed seat 34. The rotary handle 35 drives the handle 36 to enter the inside of the clamping groove 37 again, so that the handle 36 is engaged and clamped with the clamping groove 37. Through the clamping connection between the handle 36 and the clamping groove 37, the rotary handle 35 locks the threaded rod 33 through the fixed seat 34. After the threaded rod 33 cannot rotate, the adjusted position of the adjusting block 38 is locked, ensuring the stability of the adjusted position of the adjusting block 38 and avoiding the position deviation after adjusting the position of the adjusting block 38. Further, the stability of the stretching of the precision memory alloy wire by the stretching assembly is ensured.
[0041] Furthermore, it should be noted that when the rotary handle 35 is rotated downward, it needs to be kept vertical, that is, after the engagement between the handle 36 and the clamping groove 37 is released, the threaded rod 33 needs to rotate one full turn to be locked.
[0042] As Figure 1 、 Figures 7 to 9 shown in the figure, the stretching assembly includes two fixed platforms 41 fixedly connected to the tops of the two adjusting blocks 38. A set of support plates 42 are fixedly connected to the tops of the two fixed platforms 41. There are two sets of support plates 42, and each set has two support plates 42. Bearings 43 are arranged inside the two support plates 42 on the same side. A driving module 44 is fixedly connected to the inside of each of the two bearings 43. A rotating block 45 is fixedly connected to each of the two driving modules 44. A set of convex rods 451 are fixedly connected to both sides of the two rotating blocks 45. Each set of convex rods 451 has two. A fixed rod 46 is slidably connected to each set of convex rods 451. There are two fixed rods 46 in a group, and a total of two groups are provided. The cross-section of each fixed rod 46 is semicircular. One end of each fixed rod 46 away from the rotating block 45 is provided with an inclined surface. The surfaces of each fixed rod 46 facing each other are flat and are roughened. The surfaces of each fixed rod 46 facing away from each other are arc surfaces. A plurality of limiting strips arranged in a linear array are fixedly connected to the arc surfaces of each fixed rod 46 for limiting and winding the precision memory alloy wire to be subjected to a stretching test. A pressure sensor is arranged on the arc surface of each fixed rod 46. A spring 47 is sleeved on each convex rod 451. The two ends of the spring 47 are respectively fixedly connected to the end of the convex rod 451 away from the rotating block 45 and the fixed rod 46.
[0043] It should be noted that the driving module 44 is composed of components such as a stepping motor, a ball screw, and a telescopic rod. The driving module 44 is a prior art and will not be elaborated here. The driving module 44 is used for linear driving, that is, it can drive the rotating block 45 to perform a linear motion through the telescopic rod of the driving module 44.
[0044] The stretching assembly further includes a servo motor 48 fixedly connected to the two sets of support plates 42. The servo motor 48 is located on one support plate 42 away from the driving module 44. A limit groove block 49 is fixedly connected to the output shaft of the servo motor 48. The limit groove block 49 corresponds to the end of the fixed rod 46 away from the rotating block 45. A V-shaped groove is formed on the surface of the limit groove block 49 close to the fixed rod 46.
[0045] Among them, when a tensile test is performed on the precision memory alloy wire, since the adjusting block 38 has been adjusted at this time, the staff then inserts the two ends of the precision memory alloy wire between the fixed rods 46 on both sides respectively. Then, the driving module 44 is controlled to start through the built-in controller. After the driving module 44 starts, its telescopic rod will extend. The telescopic rod of the driving module 44 will drive the rotating block 45 to move towards the side close to the limit groove block 49. The rotating block 45 will drive the fixed rod 46 to move towards the limit groove block 49 synchronously. When the inclined surface of each fixed rod 46 abuts against the V-shaped groove of the limit groove block 49, under the guiding action of the V-shaped groove of the limit groove block 49, each fixed rod 46 will approach each other on the convex rod 451. The movement of the fixed rod 46 will stretch the spring 47. The flat surfaces of each fixed rod 46 approaching each other will squeeze and fix the precision memory alloy wire inserted between each fixed rod 46. At this time, the rough flat surface of the fixed rod 46 can prevent the precision memory alloy wire from loosening after contacting and fixing the precision memory alloy wire, improving the stability of the contact fixation. At this time, the servo motor 48 is controlled to start through the built-in controller. The output shaft of the servo motor 48 will drive the limit groove block 49 to rotate. Since the fixed rod 46 abuts against the V-shaped groove of the limit groove block 49, the limit groove block 49 will drive the fixed rod 46 to rotate synchronously through the V-shaped groove. The fixed rod 46 will cause the rotating block 45 to drive the driving module 44 to rotate through the convex rod 451. The driving module 44 will rotate stably in the support plate 42 through the bearing 43. At this time, rotating the fixed rod 46 will wind the precision memory alloy wire around the fixed rod 46. At this time, the simultaneous rotation of the two fixed rods 46 will gradually straighten the precision memory alloy wire. Through the winding method, it is possible to fix precision memory alloy wires of different lengths. Compared with the existing method of directly fixing with a fixture, there will be no situation where the extra precision memory alloy wire scatters. At the same time, it can also avoid the influence on the tensile test of the scattered precision memory alloy wire. At the same time, the precision memory alloy wires wound around the fixed rod 46 will rub against each other, which can avoid the loosening of the fixed precision memory alloy wire compared with the existing method of directly clamping the precision memory alloy wire, thus ensuring the stability of the tensile test of the precision memory alloy wire.
[0046] Meanwhile, the precision memory alloy wire wound around the fixed rod 46 will come into contact with the pressure sensor on the fixed rod 46. When both ends of the precision memory alloy wire are wound, the middle part of the precision memory alloy wire will be straightened. At this time, the part of the precision memory alloy wire wound around the fixed rod 46 will exert pressure on the pressure sensor. When the pressure exerted by the precision memory alloy wire on the pressure sensor exceeds the threshold of the pressure sensor, the pressure sensor will control the servo motor 48 to stop rotating through the built-in controller. At this time, the straightening and fixing of the precision memory alloy wire are completed.
[0047] It should be noted that when tensile tests need to be carried out on multiple precision memory alloy wires, the two ends of multiple precision memory alloy wires can also be respectively inserted between each fixed rod 46 of the two groups. Through the same winding method as above, multiple precision memory alloy wires can be straightened and fixed, enabling simultaneous tensile tests on multiple precision memory alloy wires. Conducting simultaneous tensile tests on precision memory alloy wires of multiple different alloy materials can improve the efficiency of tensile tests on precision memory alloy wires of different alloy materials. Because the tensile tests can be carried out simultaneously, the test data can be more accurate compared to testing single precision memory alloy wires one by one. There will be no situation where the tensile force adjustment is incorrect when replacing a single precision memory alloy wire, thus improving the accuracy of the tensile test of the precision memory alloy wire.
[0048] When conducting a tensile test on the precision memory alloy wire, the output shaft of the servo motor 48 can be controlled to rotate slowly through the built-in controller at this time. The output shaft of the servo motor 48 will drive the fixed rod 46 to rotate again through the V-shaped groove of the limit slot block 49, thereby gradually stretching the precision memory alloy wire and applying tension to the precision memory alloy, so as to detect the material properties of the precision memory alloy. In addition, the heater 21 can also be started, and then the precision memory alloy wire can be heated, enabling tensile tests on the precision memory alloy wire at different temperatures. Because at different temperatures, the shape memory effect of the memory alloy wire will be different. For example, when approaching the phase change temperature and when far from the phase change temperature, its shape recovery degree, speed, etc. are all different. Conducting tensile tests at different temperatures can clearly understand the specific law of the shape memory effect changing with temperature.
[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. An apparatus for a tensile test of a precision memory alloy wire, comprising a test workbench (1), characterized in that, A protective cover (2) is fixedly connected to the top of the test workbench (1). Multiple heaters (21) are fixedly connected to the top of the inner side wall of the protective cover (2). An adjusting component is arranged on the top of the test workbench (1). The adjusting component includes an adjusting groove (31) opened on the top of the test workbench (1). Fixed frames (32) are fixedly connected to both ends of the top of the test workbench (1). A threaded rod (33) is rotatably connected between the two fixed frames (32). One end of the threaded rod (33) passes through one of the fixed frames (32) and is fixedly connected to a fixed seat (34). A rotating handle (35) is rotatably connected to the fixed seat (34). One end of the rotating handle (35) away from the fixed seat (34) is rotatably connected to a handle (36). A clamping groove (37) is opened at one end of the bottom of the test workbench (1) near the handle (36). Two adjusting blocks (38) are threadedly connected to the threaded rod (33).
2. The device for the tensile test of the precision memory alloy wire according to claim 1, characterized in that, The two fixed frames (32) correspond to the two ends of the adjusting groove (31). Both ends of the threaded rod (33) pass through the two fixed frames (32) respectively. The outer surface of the handle (36) is provided with a rough rubber layer. The handle (36) is embedded inside the clamping groove (37). The bottoms of the two adjusting blocks (38) both slide inside the adjusting groove (31).
3. The device for the tensile test of the precision memory alloy wire according to claim 1, characterized in that, A centering block is fixedly connected to the middle of the upper surface of the test workbench (1). The thread on the threaded rod (33) is a double - thread.
4. The device for the tensile test of the precision memory alloy wire according to claim 1, wherein Tensile components are arranged on the tops of the two adjusting blocks (38). The tensile components include two fixed platforms (41) fixedly connected to the tops of the two adjusting blocks (38). A group of support plates (42) are fixedly connected to the tops of the two fixed platforms (41). Each group of support plates (42) has two. Bearings (43) are arranged inside the two support plates (42) on the same side of the two groups. A driving module (44) is fixedly connected inside each of the two bearings (43). Each driving module (44) is composed of components such as a stepping motor, a ball screw, and a telescopic rod.
5. The device for the tensile test of the precision memory alloy wire according to claim 4, wherein The tensile component further includes two rotating blocks (45) fixedly connected to the two driving modules (44). A group of convex rods (451) are fixedly connected to both sides of the rotating block (45). Fixed rods (46) are slidably connected to the convex rods (451). A spring (47) is sleeved on each convex rod (451). The two ends of the spring (47) are respectively fixedly connected to one end of the convex rod (451) away from the rotating block (45) and the fixed rod (46).
6. The device for tensile test of precision memory alloy wire according to claim 5, characterized in that, The cross - section of each fixed rod (46) is semi - circular. One end of each fixed rod (46) away from the rotating block (45) is set as an inclined surface. The surfaces of each fixed rod (46) facing each other are planes and are rough - processed. The surfaces of each fixed rod (46) facing away from each other are arc surfaces. Multiple limiting strips are fixedly connected to the arc surfaces of each fixed rod (46). Pressure sensors are arranged on the arc surfaces of each fixed rod (46).
7. The device for tensile test of precision memory alloy wire according to claim 5, characterized in that, The tensile component further includes a servo motor (48) fixedly connected to the two groups of support plates (42). A limiting groove block (49) is fixedly connected to the output shaft of the servo motor (48).
8. The device for the tensile test of the precision memory alloy wire according to claim 7, characterized in that, The limit groove block (49) corresponds to the end of the fixed rod (46) far from the rotating block (45), and V-shaped grooves are formed on the surface of the limit groove block (49) close to the fixed rod (46).