Stainless steel wire torsional fracture detection device and method based on bidirectional torsion

Abstract

The present invention relates to the technical field of wire torsion detection, and specifically to a device and method for detecting torsional fracture of a stainless steel wire based on bidirectional torsion, comprising a cabinet, and also comprising: a transverse seat and a follower plate, both of which are slidably arranged on the cabinet; a first chuck and a second chuck, the first chuck being able to rotate on the cabinet, and the second chuck being fixed on the transverse seat; a preloading mechanism, with a group provided on each side of the cabinet, connected to the transverse seat, the preloading mechanism being able to drive the transverse seat and the follower plate to move synchronously through the connecting mechanism; during the torsion process, as the number of torsion turns increases, the movable end of the double-headed cylinder drives the rotating shaft to drive the follower arm to rotate around the roller through the sliding fitting, and the resistance that the roller needs to overcome when rolling along the inclined portion increases. Compared with the constant reverse preload force provided by the weight, the matching degree of the reverse preload force and the changing torsional stress of the wire can be effectively improved, thereby improving the accuracy of the detection result.

Description

Technical Field

[0001] The present invention relates to the technical field of wire torsion detection, and in particular to a device and method for detecting torsional fracture of a stainless steel wire based on bidirectional torsion. Background Art

[0002] Medical stainless steel wire is widely used in the medical field, such as in the manufacture of intravascular stents, guidewires, orthopedic implants (including fracture fixation devices and spinal devices), dental devices (such as orthodontic wires and dental implants), and various surgical instruments. These applications place extremely high demands on the material's corrosion resistance, biocompatibility, and mechanical properties. Torsional fracture testing is a critical step in ensuring its performance and safety. Torsional fracture testing can assess the wire's ability to withstand torsional loads during actual use, thereby verifying its design rationality, material reliability, and manufacturing process feasibility. This is of great significance for ensuring the quality of medical devices and patient treatment safety.

[0003] Therefore, medical stainless steel wires need to be tested with the help of torsion testing machines during production. For existing testing methods, a weighted loading method is usually adopted, that is, the gravity of the weight is used to apply a certain tension to the chuck through the pull rope to ensure that the twisted wire is straightened; in the actual torsion process, the wire is shortened, so the wire will produce contraction stress along its length direction, and the reverse preload force provided by the weight along the length direction of the wire is used to ensure that the wire will not twist; however, the reverse preload force provided by the weight is constant, and the contraction stress caused by the shortening of the wire due to torsion increases with the increase in the number of twisting turns. As the contraction stress increases, the stress of the wire twisting also increases; in this process During the test, setting a constant reverse preload is obviously not compatible with the changing torsional stress. Of course, the initial weight of the weight can also be set larger, but if the initial weight is large, excessive reverse preload will be applied to the wire before or during the torsion process, which will cause the wire to undergo elastic elongation or even plastic elongation. Regardless of the type of elongation, the wire diameter will become smaller and thinner. This will be superimposed on the subsequent torsional deformation and thinning of the wire, accelerating wire breakage and ultimately leading to inaccurate test results. If a fixed stop is set to limit the chuck to prevent the axial shortening of the wire, this will cause the axial stress distribution inside the wire to change. During the torsion process, axial stress will be generated inside the wire, and the limitation of the stop will make the distribution of axial stress inside the specimen more complicated, which may cause local stress concentration or uneven stress distribution, affecting the mechanical properties and deformation behavior of the wire. Summary of the Invention

[0004] The object of the present invention is to provide a device and method for detecting torsional fracture of a stainless steel wire based on bidirectional torsion, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A stainless steel wire torsional fracture detection device based on bidirectional torsion includes a cabinet and further includes:

[0007] A transverse seat and a follower plate are slidably arranged on the cabinet;

[0008] The first chuck and the second chuck are used to respectively clamp the two ends of the wire to be tested, the first chuck can be rotated on the cabinet, and the second chuck is fixed on the transverse seat;

[0009] A preloading mechanism is provided on each side of the cabinet and is connected to the transverse seat. The preloading mechanism can drive the transverse seat and the follower plate to move synchronously through the connection mechanism;

[0010] The limiting mechanism is arranged between the transverse seat and the follower plate, and is used to limit the direction of the follower plate toward the first chuck. When the wire is preloaded, the connecting mechanism is triggered, the position of the follower plate is fixed, and when twisted, the limiting mechanism can gradually increase the movement resistance of the follower plate toward the side of the first chuck.

[0011] As a further solution of the present invention: a through slot is provided on the transverse shift seat, and the limiting mechanism includes two sliders slidably engaged in the through slot, and rollers are provided at the bottom of the two sliders;

[0012] It also includes a double-headed cylinder fixed to the bottom of the follower plate and two sets of deflection structures respectively connected to the two ends of the double-headed cylinder, and the deflection structures cooperate with the roller.

[0013] As a further solution of the present invention: the deflection structure includes a rotating shaft rotatably mounted on the follower plate and a follower arm fixed to the rotating shaft, the follower arm having an inclined portion formed thereon, and the double-headed cylinder can drive the rotating shaft to drive the follower arm to perform a deflection action through a sliding fitting;

[0014] When the roller contacts the inclined portion, the central axes of the rotating shaft and the roller coincide with each other.

[0015] As a further solution of the present invention: the two sliders are connected with an elastic support structure, and the elastic support structure includes a cross bar fixed in the through groove, and the cross bar passes through the two sliders and is slidably connected to the two sliders, and a convex ring is also fixed on the cross bar, and both sides of the convex ring are connected to a first spring sleeved on the outer circumference of the cross bar, and the end of the first spring away from the convex ring abuts against the slider.

[0016] As a further solution of the present invention: the sliding fitting includes a driven arm fixed to one end of the rotating shaft away from the follower arm and a convex column fixed to the movable end of the double-headed cylinder, and the driven arm is provided with a strip groove adapted to the convex column, and the convex column passes through the strip groove and is slidably connected to the driven arm.

[0017] As a further solution of the present invention: the preloading mechanism includes a loading hydraulic cylinder fixed to the side of the cabinet, and the movable end of the loading hydraulic cylinder is connected to the transverse displacement seat through an elastic telescopic component. The loading hydraulic cylinder can cause the elastic telescopic component to move relative to the transverse displacement seat and cause the connecting mechanism to be triggered.

[0018] As a further solution of the present invention: the elastic telescopic assembly includes a cylinder fixedly mounted on the transverse seat and a telescopic rod combined with the cylinder sliding sleeve and fixedly connected to the movable end of the loading hydraulic cylinder, the telescopic rod is connected to the connecting mechanism, and an elastic member is also provided between the telescopic rod and the cylinder.

[0019] As a further solution of the present invention: the elastic member includes a boss fixed to the end of the telescopic rod away from the loading hydraulic cylinder and slidingly engaged with the inner wall of the cylinder; and a second spring sleeved on the outer circumference of the telescopic rod and located inside the cylinder, one end of the second spring abuts against the boss, and the other end abuts against the inner wall of the cylinder.

[0020] As a further solution of the present invention, the connecting mechanism includes a lifting plate provided on a side of the transverse moving seat and capable of being raised and lowered relative to the transverse moving seat, and a clamping block adapted to the follower plate and arranged in a "U" shape is fixed to the bottom of the lifting plate;

[0021] Among them, the telescopic rod is fixedly connected to a connecting arm, a connecting rod is provided between the connecting arm and the lifting plate, the two ends of the connecting rod are hinged to the connecting arm and the lifting plate respectively, and two brake hydraulic cylinders are also fixed to the side of the follower plate.

[0022] The method for detecting torsional fracture of stainless steel wire, using the above-mentioned detection device, comprises the following steps:

[0023] Step 1: Use the first chuck to clamp one end of the wire to be tested, and the preload mechanism drives the traverse seat and the follower plate to move synchronously, so that the second chuck is close to the first chuck, and the second chuck is used to clamp the other end of the wire to be tested;

[0024] Step 2: The preloading mechanism continues to work to straighten the wire;

[0025] Step 3: The connecting mechanism is triggered and the follower plate is braked;

[0026] Step 4: The first chuck rotates, and the limiting mechanism increases the movement resistance of the follower plate toward the first chuck;

[0027] Step 5: If the wire breaks, organize and analyze the test data and evaluate the performance of the wire.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present application arranges a roller at the bottom of the transverse seat and uses a first spring to provide support force to the roller so that the roller contacts the inclined portion;

[0030] Specifically, during the torsion process, as the number of twisting turns increases, the active end of the double-headed cylinder will gradually extend, thereby driving the rotating shaft to drive the follower arm to rotate around the roller through the sliding mating part. As a result, the resistance that the roller needs to overcome when rolling along the inclined portion increases. Therefore, compared with the constant reverse preload provided by the weight, it can effectively improve the matching degree between the reverse preload and the changing torsional stress of the wire, reduce the influence of the increase in the shrinkage stress of the wire as the number of twisting turns increases on the test results, and effectively improve the accuracy of the test results.

[0031] Secondly, the present application provides a cylinder and a telescopic rod so that the two can elastically expand and contract. When the preload is applied, the two do not move relative to each other. The connecting mechanism enables the transverse shift seat to have the carrying capacity of the follower plate, thereby achieving synchronous adjustment of the positions of the follower plate and the transverse shift seat, ensuring that the inclined portion and the roller remain relatively stationary. When the preload is subsequently applied, the relative movement between the cylinder and the telescopic rod is used to trigger the connecting mechanism, and the transverse shift seat loses the carrying capacity of the follower plate, avoiding the problem that the position adjustment of the transverse shift seat and the follower plate is driven separately, which may result in excessive wire preload or the inclined portion not yet contacting the roller, thereby ensuring that the inclined portion can effectively increase the rolling resistance of the roller.

[0032] Hydraulic loading, while ensuring tightness, offers advantages over weight-based loading methods, including high-precision control, fast dynamic response, and a wide and continuously adjustable loading force range. Unlike the discrete nature of weight-based loading, hydraulic loading flexibly meets diverse testing requirements while avoiding tension fluctuations caused by factors such as rope expansion and contraction and pulley friction. This ensures stable axial tension throughout the test and improves the accuracy of wire torsion testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an axonometric diagram of an embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0034] Figure 2 The figure is a structural diagram of an embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0035] Figure 3 This is a structural schematic diagram from another angle of an embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0036] Figure 4 This is a structural schematic diagram of another angle of an embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0037] Figure 5 for Figure 3 A magnified view of the structure at point A in the middle.

[0038] Figure 6 This is a schematic diagram of the connection relationship between the preloading mechanism and the transverse displacement seat in an embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0039] Figure 7 for Figure 6 A magnified view of the structure at point B.

[0040] Figure 8 This is a structural explosion diagram of the connection mechanism in one embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0041] Figure 9 for Figure 8 Schematic diagram of the structure from another angle.

[0042] Figure 10 This is an exploded diagram of the structure of the limiting mechanism in one embodiment of a stainless steel wire torsional fracture detection device based on bidirectional torsion.

[0043] In the figure: 1. Cabinet; 2. Guide rail; 3. Transverse seat; 4. First chuck; 5. Second chuck; 6. Cross bar; 601. Raised ring; 7. Slider; 701. Roller; 8. First spring; 9. Follower plate; 10. Brake hydraulic cylinder; 11. Rotating shaft; 12. Follower arm; 1201. Inclined portion; 13. Follower arm; 14. Double-headed cylinder; 1401. Boss; 15. Loading hydraulic cylinder; 16. Cylinder; 17. Telescopic rod; 1701. Boss; 18. Connecting arm; 19. Lifting plate; 1901. Block; 20. Connecting rod; 21. Second spring; 22. Guide rod. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0046] See also Figures 1-10 In an embodiment of the present invention, a stainless steel wire torsional fracture detection device based on bidirectional torsion includes a cabinet 1 and further includes:

[0047] The transverse seat 3 and the follower plate 9 are slidably arranged on the cabinet 1;

[0048] The first chuck 4 and the second chuck 5 are used to respectively clamp the two ends of the wire to be tested. The first chuck 4 can rotate on the cabinet 1, and the second chuck 5 is fixed on the transverse seat 3;

[0049] A preloading mechanism is provided on each side of the cabinet 1 and is connected to the transverse seat 3. The preloading mechanism can drive the transverse seat 3 and the follower plate 9 to move synchronously through the connection mechanism;

[0050] The limiting mechanism is provided between the transverse displacement seat 3 and the follower plate 9, and is used to limit the follower plate 9 in the direction toward the first chuck 4. When the wire is preloaded, the connecting mechanism is triggered, the position of the follower plate 9 is fixed, and when twisted, the limiting mechanism can gradually increase the movement resistance of the follower plate 9 toward the side of the first chuck 4.

[0051] Furthermore, a drive motor (not marked in the figure) is installed on the cabinet 1, and the first chuck 4 is fixedly installed on the output shaft of the drive motor. When twisting, the drive motor works to drive the first chuck 4 to rotate, thereby twisting the wire;

[0052] Secondly, two guide rails 2 are fixed on the cabinet 1, and the transverse seat 3 is slidably connected to the two guide rails 2, providing precise guidance for the horizontal movement of the transverse seat 3 and the second clamp 5, ensuring that the first clamp 4 and the second clamp 5 remain concentric, avoiding the problem of the wire being deflected after clamping, which may lead to inaccurate detection results;

[0053] In addition, two guide rods 22 are fixed to the cabinet 1 , and the follower plate 9 is slidably connected to the two guide rods 22 . The guide rods 22 are parallel to the guide rails 2 .

[0054] Please refer again Figure 7 、 Figure 8 、 Figure 9 as well as Figure 10 , a through slot is provided on the transverse seat 3, and the limiting mechanism includes two sliders 7 slidably engaged in the through slot, and the bottoms of the two sliders 7 are provided with rollers 701;

[0055] It also includes a double-headed cylinder 14 fixed to the bottom of the follower plate 9 and two sets of yaw structures respectively connected to the two ends of the double-headed cylinder 14, and the yaw structures cooperate with the roller 701.

[0056] The deflection structure includes a rotating shaft 11 rotatably mounted on the follower plate 9 and a follower arm 12 fixed to the rotating shaft 11. The follower arm 12 is formed with an inclined portion 1201. The double-headed cylinder 14 can drive the rotating shaft 11 to drive the follower arm 12 to perform a deflection action through a sliding fitting.

[0057] When the roller 701 contacts the inclined portion 1201, the central axes of the rotating shaft 11 and the roller 701 coincide. The two sliders 7 are connected to an elastic support structure, which includes a crossbar 6 fixed in the through slot. The crossbar 6 passes through the two sliders 7 and is slidably connected to the two sliders 7. A convex ring 601 is also fixed to the crossbar 6. Both sides of the convex ring 601 are connected to a first spring 8 sleeved on the outer circumference of the crossbar 6. The end of the first spring 8 away from the convex ring 601 abuts against the slider 7.

[0058] Furthermore, as the first chuck 4 rotates, the wire gradually twists under the action of the torsional force (specifically, a thread-like protrusion gradually forms on the wire, and as the number of twisting turns increases, the pitch gradually decreases, and the length of the wire gradually shortens). Furthermore, as the number of twisting turns increases, the wire exerts a certain pulling force on the second chuck 5.

[0059] Furthermore, the present application provides the roller 701 at the bottom of the transverse shift seat 3 and uses the first spring 8 to provide support force to the roller 701 so that the roller 701 contacts the inclined portion 1201.

[0060] If the wire generates axial stress due to axial shortening, the roller 701 needs to give way when rolling along the inclined portion 1201, the two sliders 7 approach each other, and the first spring 8 is compressed. In addition, the double-headed cylinder 14 can drive the rotating shaft 11 to drive the follower arm 12 to perform a deflection action through the sliding fitting, so that the inclination angle of the inclined portion 1201 changes, thereby adjusting the rolling resistance of the roller 701 along the inclined portion 1201.

[0061] Specifically, during the twisting process, as the number of twisting turns increases, the movable end of the double-headed cylinder 14 will gradually extend, thereby driving the rotating shaft 11 to drive the follower arm 12 to rotate around the roller 701 (because when the roller 701 contacts the inclined portion 1201, the central axes of the rotating shaft 11 and the roller 701 coincide, so that the inclined portion 1201 and the roller 701 maintain contact) through the sliding fitting (to attach Figure 10 For example, it rotates counterclockwise), and thus, the resistance that the roller 701 needs to overcome when rolling along the inclined portion 1201 increases. Therefore, compared with the constant reverse preload provided by the weight, the matching degree between the reverse preload and the changing torsional stress of the wire can be effectively improved, and the influence of the increase in the shrinkage stress of the wire as the number of twist turns increases on the test results is reduced, thereby effectively improving the accuracy of the test results.

[0062] Please refer again Figure 10 The sliding fitting includes a driven arm 13 fixed to the end of the rotating shaft 11 away from the follower arm 12 and a boss 1401 fixed to the movable end of the double-headed cylinder 14. The driven arm 13 is provided with a strip groove adapted to the boss 1401. The boss 1401 passes through the strip groove and is slidably connected to the driven arm 13.

[0063] Specifically, a logical coordination relationship is established between the operation of the double-headed cylinder 14 and the number of rotations of the output shaft of the drive motor, that is, the elongation of the movable end of the double-headed cylinder 14 increases with the increase in the number of twisting turns of the wire, thereby increasing the inclination of the inclined portion 1201 with the increase in the number of twisting turns, that is, the resistance that the roller 701 needs to overcome when rolling along the inclined portion 1201 increases, thereby improving the matching degree between the reverse preload force and the changing torsional stress of the wire, and reducing the impact of the increase in the shrinkage stress of the wire as the number of twisting turns increases on the test results;

[0064] Specifically, when the movable end of the double-headed cylinder 14 is extended, the boss 1401 is driven to perform linear motion. Then, the boss 1401 slides with the driven arm 13 through the strip groove, so that the driven arm 13 drives the rotating shaft 11 to rotate. Accordingly, the inclined portion 1201 maintains contact with the roller 701 and rotates around the roller 701 to achieve a change in inclination, that is, the resistance that the roller 701 needs to overcome to roll along the inclined portion 1201 changes.

[0065] Please refer again Figure 5 、 Figure 8 as well as Figure 9The preloading mechanism includes a loading hydraulic cylinder 15 fixed to the side of the cabinet 1. The movable end of the loading hydraulic cylinder 15 is connected to the traversing seat 3 via an elastic telescopic assembly. The loading hydraulic cylinder 15 can cause the elastic telescopic assembly to move relative to the traversing seat 3, thereby triggering the connecting mechanism. The elastic telescopic assembly includes a cylinder 16 fixedly mounted on the traversing seat 3 and a telescopic rod 17 that slides around the cylinder 16 and is fixedly connected to the movable end of the loading hydraulic cylinder 15. The telescopic rod 17 is connected to the connecting mechanism, and an elastic member is provided between the telescopic rod 17 and the cylinder 16.

[0066] Furthermore, before the test begins, the staff needs to clamp the two ends of the wire to be tested by the first clamp 4 and the second clamp 5 respectively. To this end, the loading hydraulic cylinder 15 can be controlled to work. The loading hydraulic cylinder 15 can drive the traverse seat 3 to move along the length direction of the cabinet 1 through the telescopic rod 17 and the cylinder 16, and adjust the distance between the first clamp 4 and the second clamp 5 to a suitable degree to facilitate the clamping of the wire. During this process, under the support of the elastic member, the telescopic rod 17 and the cylinder 16 do not slide relative to each other.

[0067] After the wire is clamped, the loading hydraulic cylinder 15 is used to apply a pre-tightening force to the wire to ensure that the wire is straightened. Specifically, the movable end of the loading hydraulic cylinder 15 continues to extend. After the wire is straightened, the transverse seat 3 and the cylinder 16 cannot move further. Then, the movable end of the loading hydraulic cylinder 15 drives the telescopic rod 17 to gradually slide toward the outside of the cylinder 16. This action of the telescopic rod 17 triggers the connecting mechanism, which releases the connection between the transverse seat 3 and the follower plate 9. Only the inclined portion 1201 remains in contact with the roller 701.

[0068] Therefore, by providing the connection mechanism, during the clamping operation of the wire, that is, during the process of adjusting the spacing between the first clamp 4 and the second clamp 5, the follower plate 9 can move along with the traverse seat 3, and the inclined portion 1201 and the roller 701 always maintain a contact state. When the wire is subsequently preloaded with a tightening force, the relative movement between the telescopic rod 17 and the cylinder 16 is utilized to release the connection between the traverse seat 3 and the follower plate 9.

[0069] Of course, during specific implementation, a corresponding driving mechanism can also be set to independently drive the movement of the follower plate 9. However, after the clamping operation of the wire is completed, the driving mechanism is required to drive the follower plate 9 to move so that the inclined portion 1201 gradually approaches the roller 701. However, since the position of the second clamp 5 is different after the wire is clamped in each test, the movement stroke of the follower plate 9 is uncertain. Therefore, the driving accuracy of the driving mechanism is required to be high. If the movement stroke of the follower plate 9 is too large, the inclined portion 1201 will have a certain pressure on the roller 701, which will cause the pre-tightening force on the wire to be too large. If the pre-tightening force is too large, the mechanical and physical properties of the wire will change, resulting in the test results being inconsistent with the actual performance, affecting the accurate evaluation of the wire quality. If the stroke is too small, the inclined portion 1201 and the roller 701 will be separated, and the effect of the rolling resistance will be invalid.

[0070] The present application sets a cylinder 16 and a telescopic rod 17 so that the two can elastically expand and contract. When the preload is loaded, there is no relative movement between the two. The connecting mechanism enables the transverse seat 3 to have the carrying capacity of the follower plate 9, thereby realizing the synchronous adjustment of the position of the follower plate 9 and the transverse seat 3, ensuring that the inclined portion 1201 and the roller 701 remain relatively stationary. When the preload is subsequently loaded, the relative movement between the cylinder 16 and the telescopic rod 17 is utilized to trigger the connecting mechanism, and the transverse seat 3 loses the carrying capacity of the follower plate 9, avoiding the problem that the position adjustment of the transverse seat 3 and the follower plate 9 is driven separately, which may cause the wire preload to be too large or the inclined portion 1201 has not yet contacted the roller 701, and ensuring that the inclined portion 1201 can effectively increase the rolling resistance of the roller 701.

[0071] The elastic member includes a boss 1701 fixed to one end of the telescopic rod 17 away from the loading hydraulic cylinder 15 and slidingly engaged with the inner wall of the cylinder 16, and a second spring 21 sleeved on the outer circumference of the telescopic rod 17 and located inside the cylinder 16, one end of the second spring 21 abuts against the boss 1701, and the other end abuts against the inner wall of the cylinder 16.

[0072] Specifically, during the preloading process, in the initial stage, the telescopic rod 17 gradually slides toward the outside of the cylinder 16, and the second spring 21 is compressed. During this process, the wire is stretched straight and a certain preload force is applied. The telescopic rod 17 triggers the connecting mechanism, which cancels the carrying capacity of the transverse seat 3 on the follower plate 9, thereby ensuring that the inclined portion 1201 can effectively increase the rolling resistance of the roller 701.

[0073] This application adopts a hydraulic loading method, which, under the premise of ensuring sealing, has the advantages of high-precision control, fast dynamic response, wide loading force range and continuous adjustment compared to the loading method using weights. Unlike the discreteness of weight loading, hydraulic loading can flexibly meet different detection requirements, and it is small in size, compact in structure, and saves space. It can be integrated with a computer to achieve automated control and reduce human error. In addition, for the loading method of weights, the application of axial tension is achieved through rope-pulley-weight loading. This method may cause fluctuations in tension due to factors such as the expansion and contraction of the rope and the friction of the pulley. It cannot guarantee the constancy of the axial tension during the entire detection process, thereby affecting the accuracy of wire torsion detection.

[0074] Please refer again Figure 5 、 Figure 8 as well as Figure 9 The connecting mechanism includes a lifting plate 19 which is arranged on the side of the transverse seat 3 and can be lifted and lowered relative to the transverse seat 3. A block 1901 which is adapted to the follower plate 9 and is arranged in a "U" shape is fixed to the bottom of the lifting plate 19; the telescopic rod 17 is fixedly connected to a connecting arm 18, and a connecting rod 20 is provided between the connecting arm 18 and the lifting plate 19. The two ends of the connecting rod 20 are respectively hinged to the connecting arm 18 and the lifting plate 19. Two brake hydraulic cylinders 10 are also fixed to the side of the follower plate 9.

[0075] When adjusting the distance between the first chuck 4 and the second chuck 5, the telescopic rod 17 and the cylinder 16 do not move relative to each other. At this time, the clamping block 1901 abuts against the follower plate 9. By utilizing its "U"-shaped characteristic, the transverse seat 3 can move with the follower plate 9, ensuring that the inclined portion 1201 and the roller 701 remain relatively stationary.

[0076] During the preload process, when the telescopic rod 17 slides toward the outside of the cylinder 16, the connecting arm 18 will push the lifting plate 19 to rise on the transverse seat 3 through the connecting rod 20 until the block 1901 is separated from the follower plate 9, and then the limiting effect of the block 1901 on the follower plate 9 is released, that is, the carrying capacity of the transverse seat 3 on the follower plate 9 is cancelled, and then the brake hydraulic cylinder 10 works, and its movable end extends, acting on the surface of the cabinet 1, braking the follower plate 9, ensuring that the follower plate 9 can remain in place during the detection process. Preferably, the movable fixed brake pad of the brake hydraulic cylinder 10 is set.

[0077] As another embodiment of the present invention, a method for detecting torsional fracture of a stainless steel wire is also provided, which uses the aforementioned detection device and includes the following steps:

[0078] Step 1: Use the first chuck 4 to clamp one end of the wire to be tested, and the preload mechanism drives the traverse seat 3 and the follower plate 9 to move synchronously, so that the second chuck 5 is close to the first chuck 4, and the second chuck 5 is used to clamp the other end of the wire to be tested;

[0079] Step 2: The preloading mechanism continues to work to straighten the wire;

[0080] Step 3: The connecting mechanism is triggered and the follower plate 9 is braked;

[0081] Step 4: The first chuck 4 rotates, and the limiting mechanism increases the movement resistance of the follower plate 9 toward the first chuck 4;

[0082] Step 5: If the wire breaks, organize and analyze the test data and evaluate the performance of the wire.

[0083] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0084] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Stainless steel wire torsional fracture detection device based on bidirectional torsion, including cabinet; It is characterized in that Also includes: A transverse seat and a follower plate are slidably arranged on the cabinet; The first chuck and the second chuck are used to respectively clamp the two ends of the wire to be tested, the first chuck can be rotated on the cabinet, and the second chuck is fixed on the transverse seat; A preloading mechanism is provided on each side of the cabinet and is connected to the transverse seat. The preloading mechanism can drive the transverse seat and the follower plate to move synchronously through the connection mechanism to change the distance between the first clamp and the second clamp; A limiting mechanism is provided between the transverse seat and the follower plate, and is used to limit the follower plate in a direction toward the first chuck. When the wire is preloaded, the connecting mechanism is triggered, the position of the follower plate is fixed, and when twisted, the limiting mechanism can gradually increase the movement resistance of the follower plate toward the first chuck. The transverse seat is provided with a through slot, and the limiting mechanism includes two sliders slidably engaged in the through slot, and the bottoms of the two sliders are provided with rollers; It also includes a double-headed cylinder fixed to the bottom of the follower plate and two sets of deflection structures respectively connected to the two ends of the double-headed cylinder, and the deflection structures cooperate with the roller; The deflection structure includes a rotating shaft rotatably mounted on the follower plate and a follower arm fixed to the rotating shaft, wherein the follower arm is formed with an inclined portion, and the double-headed cylinder can drive the rotating shaft to drive the follower arm to perform a deflection action through a sliding fitting; Wherein, when the roller contacts the inclined portion, the central axes of the rotating shaft and the roller coincide with each other; The two sliders are connected to an elastic support structure, which includes a cross bar fixed in the through slot, the cross bar passing through the two sliders and being slidably connected to the two sliders, and a convex ring is fixed to the cross bar, and both sides of the convex ring are connected to a first spring sleeved on the outer circumference of the cross bar, and the end of the first spring away from the convex ring abuts against the slider; The sliding fitting comprises a driven arm fixed to an end of the rotating shaft away from the follower arm and a boss fixed to the movable end of the double-headed cylinder, the driven arm being provided with a strip groove adapted to the boss, the boss passing through the strip groove and being slidably connected to the driven arm; The preloading mechanism includes a loading hydraulic cylinder fixed to the side of the cabinet, the movable end of the loading hydraulic cylinder being connected to the transverse seat via an elastic telescopic component, and the loading hydraulic cylinder being able to cause the elastic telescopic component to move relative to the transverse seat and cause the connection mechanism to be triggered; The elastic telescopic assembly includes a cylinder fixedly mounted on the transverse seat and a telescopic rod that is combined with the cylinder sliding sleeve and fixedly connected to the movable end of the loading hydraulic cylinder, and the telescopic rod is connected to the connecting mechanism; The connecting mechanism includes a lifting plate provided on the side of the transverse moving seat and capable of rising and falling relative to the transverse moving seat, and a clamping block adapted to the follower plate and arranged in a "U" shape is fixed to the bottom of the lifting plate; Among them, the telescopic rod is fixedly connected to a connecting arm, a connecting rod is provided between the connecting arm and the lifting plate, the two ends of the connecting rod are hinged to the connecting arm and the lifting plate respectively, and two brake hydraulic cylinders are also fixed to the side of the follower plate.

2. The device for detecting torsional fracture of a stainless steel wire rod based on bidirectional torsion according to claim 1, characterized in that: An elastic member is further provided between the telescopic rod and the cylinder.

3. The device for detecting torsional fracture of a stainless steel wire rod based on bidirectional torsion according to claim 2, characterized in that: The elastic member includes a boss fixed to one end of the telescopic rod away from the loading hydraulic cylinder and slidingly engaged with the inner wall of the cylinder, and a second spring sleeved on the outer circumference of the telescopic rod and located inside the cylinder, one end of the second spring abuts against the boss, and the other end abuts against the inner wall of the cylinder.

4. A method for detecting torsional fracture of a stainless steel wire, using the detection device according to claim 1, characterized in that: The following steps are involved: Step 1: Use the first chuck to clamp one end of the wire to be tested, and the preload mechanism drives the traverse seat and the follower plate to move synchronously, so that the second chuck is close to the first chuck, and the second chuck is used to clamp the other end of the wire to be tested; Step 2: The preloading mechanism continues to work to straighten the wire; Step 3: The connecting mechanism is triggered and the follower plate is braked; Step 4: The first chuck rotates, and the limiting mechanism increases the movement resistance of the follower plate toward the first chuck; Step 5: If the wire breaks, organize and analyze the test data and evaluate the performance of the wire.

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