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

Abstract

The invention relates to the technical field of wire torsion detection, in particular to a stainless steel wire torsion fracture detection device and method based on bidirectional torsion, and the device comprises a cabinet, and also comprises a transverse moving seat and a follower plate which are slidably arranged on the cabinet; the first clamping head can rotate on the cabinet, and the second clamping head is fixed on the transverse moving seat; the preloading mechanisms are arranged on the two sides of the cabinet respectively and connected with the transverse moving seat, and the preloading mechanisms can drive the transverse moving seat and the follow-up plate to move synchronously through the connecting mechanism; in the torsion process, along with the increase of the number of torsion turns, the movable end of the double-head air cylinder drives the rotating shaft through the sliding matching piece to drive the follow-up arm to rotate around the rolling wheel, the resistance needing to be overcome when the rolling wheel rolls along the inclined part is increased, and compared with constant reverse pre-tightening force provided by a weight, the torque is reduced. The matching degree of the reverse pre-tightening force and the changed twisting stress of the wire rod can be effectively improved, and the accuracy of a detection result is improved.

Description

Technical Field

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

[0002] Medical stainless steel wires are widely used in the medical field, such as for manufacturing intravascular stents, guide wires, orthopedic implants (including fracture fixation devices, spinal devices, etc.), dental instruments (such as orthodontic wires, dental implants, etc.), and various surgical instruments. These applications have extremely high requirements for the corrosion resistance, biocompatibility, mechanical properties, etc. of the materials, and torsion fracture detection is a key step to ensure their performance and safety. Through torsion fracture detection, the ability of the wire to withstand torsional loads during actual use can be evaluated, thereby verifying the rationality of its design, the reliability of the material, and the feasibility of the manufacturing process, which is of great significance for ensuring the quality of medical devices and the treatment safety of patients.

[0003] In this regard, during the production of medical stainless steel wires, a torsion testing machine is required for detection. For existing detection methods, a loading method with weights added is usually adopted, that is, the gravity of the weights is used to apply a certain pulling force to the chuck through a pulling rope to ensure that the wire after torsion is straightened; during the actual torsion process, since the wire shortens, the wire will generate a contraction stress along its length direction, and through the reverse pre-tightening force provided by the weights along the length direction of the wire, it is ensured that the wire will not be distorted; however, the reverse pre-tightening force provided by the weights is constant, while the contraction stress formed by the shortening of the wire due to torsion increases with the increase in the number of torsion turns. Along with the increase in the contraction stress, the stress of the wire twisting also increases; during this process, it is obvious that setting a constant reverse pre-tightening force does not match the changing twisting stress; of course, the initial weight of the weights can also be set larger, but if the initial weight of the weights is large, it will apply an excessive reverse pre-tightening force to the wire that has not been twisted or is being twisted, which will cause the wire to undergo elastic elongation deformation or even plastic elongation deformation. No matter which elongation deformation occurs, it will cause the diameter of the wire to become smaller and thinner; this will be superimposed on the subsequent torsional deformation and thinning of the wire, accelerating the fracture of the wire and ultimately resulting in inaccurate test result data. If a fixed stop block is set to limit the chuck to prevent the axial shortening of the wire, this will cause a change in the axial stress distribution inside the wire. During the torsion process, axial stress will be generated inside the wire, and the limitation of the stop block will make the distribution of the axial stress inside the specimen more complex, 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 purpose of the present invention is to provide a device and method for detecting the torsion fracture of stainless steel wires based on bidirectional torsion to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A torsional fracture detection device for stainless steel wire based on bidirectional torsion, comprising a cabinet, and further comprising: A transverse movement seat and a follower plate, both of which are slidably arranged on the cabinet; A first chuck and a second chuck, which are used to clamp both ends of the wire to be tested respectively. The first chuck can rotate on the cabinet, and the second chuck is fixed on the transverse movement seat; A preloading mechanism, with a set on each side of the cabinet, connected to the transverse movement seat. The preloading mechanism can drive the transverse movement seat and the follower plate to move synchronously through a connecting mechanism; A limiting mechanism, arranged between the transverse movement seat and the follower plate, used to limit the direction of the follower plate towards the first chuck. When preloading the wire, the connecting mechanism is triggered and the position of the follower plate is fixed. During torsion, the limiting mechanism can make the movement resistance of the follower plate towards the first chuck side gradually increase.

[0006] As a further scheme of the present invention: a through groove is provided on the transverse movement seat. The limiting mechanism includes two sliders slidably fitted in the through groove, and rollers are provided at the bottoms of both sliders; It further includes a double-headed cylinder fixed to the bottom of the follower plate and two sets of yaw structures respectively connected to both ends of the double-headed cylinder. The yaw structures cooperate with the rollers.

[0007] As a further scheme of the present invention: the yaw structure includes a rotating shaft rotatably installed on the follower plate and a follower arm fixed to the rotating shaft. An inclined portion is formed on the follower arm. 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.

[0008] As a further scheme of the present invention: the two sliders are connected with an elastic support structure. The elastic support structure includes a cross bar fixed in the through groove. The cross bar penetrates through the two sliders and is slidably connected to the two sliders. A convex ring is also fixed on the cross bar. A first spring sleeved on the outer periphery of the cross bar is connected to each side of the convex ring, and the end of the first spring away from the convex ring abuts against the slider.

[0009] As a further solution of the present invention: the sliding fitting member 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. A strip-shaped groove adapted to the convex column is provided on the driven arm, and the convex column penetrates through the strip-shaped groove and is slidably connected to the driven arm.

[0010] As a further solution of the present invention: the preloading mechanism includes a loading hydraulic cylinder fixed to the side of the cabinet. The movable end of the loading hydraulic cylinder is connected to the transverse movement seat through an elastic telescopic component. The loading hydraulic cylinder can cause the elastic telescopic component to move relative to the transverse movement seat and trigger the connection mechanism.

[0011] As a further solution of the present invention: the elastic telescopic component includes a cylinder fixed to the transverse movement seat and a telescopic rod that is slidably sleeved with the cylinder and fixedly connected to the movable end of the loading hydraulic cylinder. The telescopic rod is connected to the connection mechanism, and an elastic member is further provided between the telescopic rod and the cylinder.

[0012] As a further solution of the present invention: the elastic member includes a convex platform fixed to one end of the telescopic rod away from the loading hydraulic cylinder and slidably fitted to the inner wall of the cylinder, and a second spring sleeved on the outer periphery of the telescopic rod and located inside the cylinder. One end of the second spring abuts against the convex platform, and the other end abuts against the inner wall of the cylinder.

[0013] As a further solution of the present invention: the connection mechanism includes a lifting plate member provided on the side of the transverse movement seat and capable of lifting relative to the transverse movement seat. A block adapted to the follower plate and arranged in a shape similar to a "U" is fixed to the bottom of the lifting plate member; Wherein, the telescopic rod is fixedly connected with a connecting arm. A connecting rod is provided between the connecting arm and the lifting plate member. The two ends of the connecting rod are respectively hinged to the connecting arm and the lifting plate member. Two braking hydraulic cylinders are also fixed to the side of the follower plate.

[0014] The method for detecting the torsional fracture of stainless steel wire rod, using the detection device described above, includes the following steps: Step 1, clamp one end of the wire rod to be tested by the first chuck. The preloading mechanism drives the transverse movement seat and the follower plate to move synchronously, so that the second chuck approaches the first chuck, and clamp the other end of the wire rod to be tested by the second chuck; Step 2, the preloading mechanism continues to work to straighten the wire rod; Step 3, the connection 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 towards the side of the first chuck; Step 5: The wire breaks. Organize, analyze, and detect the data, and evaluate the performance of the wire.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, rollers are provided at the bottom of the transverse moving seat. At the same time, a first spring is used to provide a supporting force for the rollers, so that the rollers are in contact with the inclined part. Specifically, during the torsion process, as the number of torsion turns increases, the movable end of the double-headed cylinder will gradually elongate, thereby driving the rotating shaft to drive the follower arm to rotate around the roller through the sliding fitting member. Furthermore, the resistance required for the roller to roll along the inclined part increases. Therefore, compared with the constant reverse pre-tightening force provided by the weights, the matching degree of the reverse pre-tightening force and the torsional stress change of the wire can be effectively improved, and the influence of the increase in the shrinkage stress generated by the wire with the increase in the number of torsion turns on the test results can be weakened, effectively improving the accuracy of the test results. Secondly, in this application, by setting the cylinder and the telescopic rod, elastic telescopic changes can occur between the two. Before loading the pre-tightening force, there is no relative movement between the two. Through the connecting mechanism, the transverse moving seat has the ability to carry the follower plate, thereby realizing the synchronous adjustment of the positions of the follower plate and the transverse moving seat, ensuring that the inclined part and the roller remain relatively stationary. When the pre-tightening force is loaded subsequently, the relative movement between the cylinder and the telescopic rod causes the connecting mechanism to be triggered, and the transverse moving seat loses the ability to carry the follower plate, avoiding the problem that the positions of the transverse moving seat and the follower plate are adjusted separately, which may lead to an over-large pre-tightening force of the wire or the inclined part not being in contact with the roller, ensuring that the inclined part can effectively increase the rolling resistance of the roller. The hydraulic loading method is adopted. On the premise of ensuring the sealing performance, compared with the loading method using weights, it has the advantages of high-precision control, fast dynamic response, a wide loading force range and continuous adjustability. Different from the discreteness of weight loading, hydraulic loading can flexibly meet different test requirements, and at the same time avoid fluctuations in the tension force caused by factors such as the stretching of the pulling rope and the friction of the pulley, ensuring the stability of the axial tension force during the whole test process and improving the accuracy of the wire torsion test. Description of the Drawings

[0016] Figure 1 An isometric view of an embodiment of a stainless steel wire torsion fracture detection device based on bidirectional torsion.

[0017] Figure 2 A structural schematic diagram of an embodiment of a stainless steel wire torsion fracture detection device based on bidirectional torsion.

[0018] Figure 3 A structural schematic diagram of another angle of an embodiment of a stainless steel wire torsion fracture detection device based on bidirectional torsion.

[0019] Figure 4 Schematic structural diagram of another angle of an embodiment of a torsional fracture detection device for stainless steel wire based on bidirectional torsion.

[0020] Figure 5 It is Figure 3 The enlarged structural diagram at position A in

[0021] Figure 6 Schematic diagram of the connection relationship between the preloading mechanism and the cross - moving seat in an embodiment of a torsional fracture detection device for stainless steel wire based on bidirectional torsion.

[0022] Figure 7 It is Figure 6 The enlarged structural diagram at position B in

[0023] Figure 8 Exploded view of the structure of the connection mechanism in an embodiment of a torsional fracture detection device for stainless steel wire based on bidirectional torsion.

[0024] Figure 9 It is Figure 8 Schematic structural diagram of another angle.

[0025] Figure 10 Exploded view of the structure of the limit mechanism in an embodiment of a torsional fracture detection device for stainless steel wire based on bidirectional torsion.

[0026] In the figure: 1, cabinet; 2, guide rail; 3, cross - moving seat; 4, first chuck; 5, second chuck; 6, cross bar; 601, convex ring; 7, slider; 701, roller; 8, first spring; 9, follower plate; 10, braking hydraulic cylinder; 11, rotating shaft; 12, follower arm; 1201, inclined part; 13, driven arm; 14, double - headed cylinder; 1401, convex column; 15, loading hydraulic cylinder; 16, cylinder; 17, telescopic rod; 1701, convex platform; 18, connecting arm; 19, lifting plate member; 1901, clamping block; 20, connecting rod; 21, second spring; 22, guide rod. Detailed implementation manners

[0027] 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0028] In addition, the elements in the present invention are referred to as "fixed to" or "disposed on" another element, and it can be directly on another element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to another element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0029] Please refer to Figures 1 - 10 , in the embodiment of the present invention, a torsional fracture detection device for stainless steel wire based on bidirectional torsion includes a cabinet 1, and further includes: A transverse movement seat 3 and a follower plate 9, both of which are slidably disposed on the cabinet 1; A first chuck 4 and a second chuck 5, which are used to clamp both ends of the wire to be tested respectively. The first chuck 4 can rotate on the cabinet 1, and the second chuck 5 is fixed to the transverse movement seat 3; A preloading mechanism, with a set on each side of the cabinet 1, is connected to the transverse movement seat 3, and the preloading mechanism can drive the transverse movement seat 3 and the follower plate 9 to move synchronously through a connection mechanism; A limiting mechanism is disposed between the transverse movement seat 3 and the follower plate 9, which is used to limit the direction of the follower plate 9 towards the first chuck 4. When preloading the wire, the connection mechanism is triggered and the position of the follower plate 9 is fixed. When twisting, the limiting mechanism can make the movement resistance of the follower plate 9 towards the first chuck 4 side gradually increase.

[0030] Furthermore, a driving 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 driving motor. When twisting, the driving motor works and can drive the first chuck 4 to rotate, so as to twist the wire; Secondly, two guide rails 2 are fixed on the cabinet 1, and the transverse movement seat 3 is slidably connected to the two guide rails 2, providing precise guidance for the horizontal movement of the transverse movement seat 3 and the second chuck 5, ensuring that the first chuck 4 and the second chuck 5 are concentric, and avoiding the problem that the wire is deflected after being clamped, which may lead to inaccurate detection results; In addition, two guide rods 22 are also fixed on the cabinet 1, and the follower plate 9 is slidably connected to the two guide rods 22, and the guide rods 22 are parallel to the guide rails 2.

[0031] Please refer to again Figure 7 , Figure 8 , Figure 9 and Figure 10, a through groove is provided on the transverse moving base 3, and the limiting mechanism includes two sliders 7 slidably fitted in the through groove, and rollers 701 are provided at the bottoms of the two sliders 7; It further includes a double-headed cylinder 14 fixed to the bottom of the follower plate 9 and two sets of yaw structures respectively connected to both ends of the double-headed cylinder 14, and the yaw structures cooperate with the rollers 701.

[0032] The yaw structure includes a rotating shaft 11 rotatably installed on the follower plate 9 and a follower arm 12 fixed to the rotating shaft 11. An inclined portion 1201 is formed on the follower arm 12, and 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 member; Wherein, when the roller 701 contacts the inclined portion 1201, the central axis of the rotating shaft 11 and the roller 701 coincide. The two sliders 7 are connected with an elastic support structure, and the elastic support structure includes a cross bar 6 fixed in the through groove. The cross bar 6 passes through the two sliders 7 and is slidably connected with the two sliders 7, and a convex ring 601 is further fixed on the cross bar 6. A first spring 8 sleeved on the outer periphery of the cross bar 6 is connected to each side of the convex ring 601, and the end of the first spring 8 away from the convex ring 601 abuts against the slider 7.

[0033] Furthermore, when the first chuck 4 rotates, under the action of the torsional force, the wire gradually twists (specifically, that is, a thread-like protrusion gradually forms on the wire. As the number of torsion turns increases, the pitch gradually decreases and the length of the wire gradually shortens). Furthermore, as the number of torsion turns increases, the wire will have a certain pulling force on the second chuck 5; Furthermore, in this application, by arranging the roller 701 at the bottom of the transverse moving base 3, and at the same time, using the first spring 8 to provide a supporting force for the roller 701, the roller 701 is in contact with the inclined portion 1201; If the wire generates axial stress due to axial shortening, then when the roller 701 rolls along the inclined portion 1201, the roller 701 needs to give way, 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 a sliding fitting member, so that the inclination angle of the inclined portion 1201 changes. Thus, the resistance of the roller 701 rolling along the inclined portion 1201 can be adjusted; Specifically, during the twisting process, as the number of twisting turns increases, the movable end of the double-headed cylinder 14 will gradually elongate, thereby driving the rotating shaft 11 to drive the follower arm 12 to rotate around the roller 701 through the sliding fitting member (since 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 remains in contact with the roller 701), (taking Figure 10 as an example, it rotates counterclockwise). Furthermore, the resistance that the roller 701 needs to overcome when rolling along the inclined portion 1201 increases. Therefore, compared with the constant reverse pre-tightening force provided by the weight, the matching degree of the reverse pre-tightening force and the twisting stress of the wire change can be effectively improved, and the influence on the test result caused by the increase in the shrinkage stress of the wire as the number of twisting turns increases can be weakened, effectively improving the accuracy of the test result.

[0034] Please refer to again Figure 10 , the sliding fitting member includes a follower arm 13 fixed to one end of the rotating shaft 11 away from the follower arm 12 and a convex column 1401 fixed to the movable end of the double-headed cylinder 14. A strip-shaped groove adapted to the convex column 1401 is provided on the follower arm 13, and the convex column 1401 penetrates through the strip-shaped groove and is slidably connected to the follower arm 13.

[0035] Specifically, a logical cooperation relationship is established between the operation of the double-headed cylinder 14 and the number of rotation turns of the output shaft of the driving motor, that is, the elongation amount of the movable end of the double-headed cylinder 14 increases as the number of twisting turns of the wire increases, and further, the inclination degree of the inclined portion 1201 increases as the number of twisting turns increases, that is, the resistance that the roller 701 needs to overcome when rolling along the inclined portion 1201 increases, so as to improve the matching degree of the reverse pre-tightening force and the twisting stress of the wire change, and weaken the influence on the test result caused by the increase in the shrinkage stress of the wire as the number of twisting turns increases; Specifically, when the movable end of the double-headed cylinder 14 elongates, it drives the convex column 1401 to perform a linear motion. Then, the convex column 1401 is slidably fitted with the follower arm 13 through the strip-shaped groove, so that the follower arm 13 drives the rotating shaft 11 to rotate. Correspondingly, the inclined portion 1201 remains in contact with the roller 701 and rotates around the roller 701 to realize the change of the inclination degree, that is, the resistance that the roller 701 needs to overcome when rolling along the inclined portion 1201 changes.

[0036] Please refer to again Figure 5 , Figure 8 and Figure 9, the 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 transverse movement seat 3 through an elastic telescopic assembly. The loading hydraulic cylinder 15 can cause the elastic telescopic assembly to move relative to the transverse movement seat 3 and trigger the connection mechanism. The elastic telescopic assembly includes a cylinder 16 fixedly installed on the transverse movement seat 3 and a telescopic rod 17 that is slidably sleeved with the cylinder 16 and fixedly connected to the movable end of the loading hydraulic cylinder 15. The telescopic rod 17 is connected to the connection mechanism, and an elastic member is further provided between the telescopic rod 17 and the cylinder 16.

[0037] Furthermore, before the detection starts, the staff needs to clamp both ends of the wire to be measured through the first chuck 4 and the second chuck 5 respectively. For this, the loading hydraulic cylinder 15 can be controlled to work. The loading hydraulic cylinder 15 can drive the transverse movement 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 chuck 4 and the second chuck 5 to an appropriate degree to facilitate the clamping of the wire. During this process, under the supporting action of the elastic member, the telescopic rod 17 and the cylinder 16 do not slide relative to each other; After the wire is clamped, a pre-tightening force needs to be applied to the wire through the loading hydraulic cylinder 15 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 movement seat 3 and the cylinder 16 can no longer move. Furthermore, the movable end of the loading hydraulic cylinder 15 will drive the telescopic rod 17 to gradually slide towards the outside of the cylinder 16. This action of the telescopic rod 17 triggers the connection mechanism, and the connection mechanism releases the connection state between the transverse movement seat 3 and the follower plate 9. Only the inclined portion 1201 and the roller 701 remain in contact; Therefore, by setting the connection mechanism, during the clamping operation of the wire, that is, during the process of adjusting the distance between the first chuck 4 and the second chuck 5, the follower plate 9 can move together with the transverse movement seat 3, and the inclined portion 1201 and the roller 701 always remain in contact. When the pre-tightening force is loaded on the wire subsequently, the relative movement between the telescopic rod 17 and the cylinder 16 is used to release the connection state between the transverse movement seat 3 and the follower plate 9; Of course, during specific implementation, a corresponding driving mechanism can also be set to separately drive the movement of the follower plate 9. However, after the clamping operation of the wire is completed, the driving mechanism needs 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 chuck 5 is different after the wire clamping operation in each detection, the movement stroke of the follower plate 9 is uncertain. Therefore, the driving accuracy requirements for the driving mechanism are relatively high. If the movement stroke of the follower plate 9 is too large, it will cause the inclined portion 1201 to have a certain pressure on the roller 701, thereby resulting in an excessive pre-tightening force on the wire. If the pre-tightening force is too large, the mechanical and physical properties of the wire will change, resulting in the detection result not conforming to the actual performance and affecting the accurate evaluation of the wire quality. If the stroke is too small, it will cause the inclined portion 1201 and the roller 701 to separate, and the effect of the rolling resistance will be invalid.

[0038] In this application, by providing the cylinder 16 and the telescopic rod 17, elastic telescopic changes can occur between the two. Before applying the pre-tightening force, there is no relative movement between the two. Through the connecting mechanism, the transverse movement seat 3 has the ability to carry the follower plate 9, thereby realizing the synchronous adjustment of the positions of the follower plate 9 and the transverse movement seat 3, ensuring that the inclined portion 1201 and the roller 701 remain relatively stationary. When the pre-tightening force is subsequently applied, the relative movement between the cylinder 16 and the telescopic rod 17 causes the connecting mechanism to be triggered, and the transverse movement seat 3 loses the ability to carry the follower plate 9, avoiding the problems that the pre-tightening force of the wire may be too large or the inclined portion 1201 has not yet contacted the roller 701 due to the separate driving of the position adjustment of the transverse movement seat 3 and the follower plate 9, and ensuring that the inclined portion 1201 can effectively increase the rolling resistance of the roller 701.

[0039] The elastic member includes a boss 1701 fixed to the end of the telescopic rod 17 away from the loading hydraulic cylinder 15 and slidably fitted to the inner wall of the cylinder 16, and a second spring 21 sleeved on the outer periphery 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.

[0040] Specifically, during the preloading process, in the initial stage, the telescopic rod 17 gradually slides towards the outside of the cylinder 16, and the second spring 21 is compressed. During this process, the wire is straightened and a certain pre-tightening force is applied. The telescopic rod 17 will cause the connecting mechanism to be triggered, and the connecting mechanism cancels the ability of the transverse movement seat 3 to carry the follower plate 9, so as to ensure that the inclined portion 1201 can effectively increase the rolling resistance of the roller 701; This application adopts a hydraulic loading method. On the premise of ensuring airtightness, compared with the loading method using weights, it has the advantages of high-precision control, fast dynamic response, a wide and continuously adjustable loading force range, etc. Different from the discreteness of weight loading, hydraulic loading can flexibly meet different detection requirements, and has a small volume, a compact structure, and saves space. It can be integrated with a computer to achieve automatic control and reduce human errors. In addition, for the weight loading method, the axial tensile force is applied through a rope-pulley-weight loading. This method may cause fluctuations in the tensile force due to factors such as the stretching of the rope and the friction of the pulley, and cannot ensure the constancy of the axial tensile force throughout the detection process, thus affecting the accuracy of wire torsion detection.

[0041] Please refer to again Figure 5 、 Figure 8 and Figure 9 As shown in, the connecting mechanism includes a lifting plate member 19 provided on the side of the transverse movement seat 3 and capable of lifting relative to the transverse movement seat 3. A block 1901 adapted to the follower plate 9 and having a U-shaped configuration is fixed to the bottom of the lifting plate member 19; the telescopic rod 17 is fixedly connected with a connecting arm 18. A connecting rod 20 is provided between the connecting arm 18 and the lifting plate member 19. The two ends of the connecting rod 20 are respectively hinged to the connecting arm 18 and the lifting plate member 19. Two braking hydraulic cylinders 10 are also fixed to the side of the follower plate 9.

[0042] 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 block 1901 abuts against the follower plate 9. By virtue of its U-shaped characteristic, the transverse movement seat 3 can carry the follower plate 9 to move together, ensuring that the inclined portion 1201 and the roller 701 remain relatively stationary. During the pre-tightening force loading process, when the telescopic rod 17 slides towards the outside of the cylinder 16, the connecting arm 18 will push the lifting plate member 19 to rise on the transverse movement seat 3 through the connecting rod 20 until the block 1901 separates from the follower plate 9. Furthermore, the limiting effect of the block 1901 on the follower plate 9 is released, that is, the carrying ability of the transverse movement seat 3 for the follower plate 9 is cancelled. Immediately afterwards, the braking hydraulic cylinder 10 works, and its movable end extends and acts on the surface of the cabinet 1 to brake the follower plate 9, ensuring that the follower plate 9 can remain in place during the detection process. Preferably, a brake pad is fixedly arranged at the movable end of the braking hydraulic cylinder 10.

[0043] As another embodiment of the present invention, a method for detecting the torsion fracture of stainless steel wire is also proposed. Using the detection device described above, it includes the following steps: Step 1: Clamp one end of the wire to be tested using the first chuck 4. The preloading mechanism drives the transverse seat 3 and the follower plate 9 to move synchronously, so that the second chuck 5 approaches the first chuck 4, and then clamp the other end of the wire to be tested using the second chuck 5; Step 2: The preloading mechanism continues to work to straighten the wire; Step 3: The connecting mechanism is triggered and the follower plate 9 is braked; Step 4: The first chuck 4 rotates, and the limiting mechanism increases the movement resistance of the follower plate 9 towards the side of the first chuck 4; Step 5: The wire breaks, the test data is sorted out and analyzed, and the performance of the wire is evaluated.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claim.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A torsional fracture detection device for stainless steel wire based on bidirectional torsion, comprising a cabinet; characterized in that, It further includes: A transverse moving base and a follower plate, which are slidably arranged on the cabinet; a first chuck and a second chuck, which are used to clamp both ends of the wire to be tested respectively. The first chuck can rotate on the cabinet, and the second chuck is fixed on the transverse moving base; a preloading mechanism, with a set on each side of the cabinet, is connected to the transverse moving base. The preloading mechanism can drive the transverse moving base and the follower plate to move synchronously through a connecting mechanism, so as to change the distance between the first chuck and the second chuck; a limiting mechanism is arranged between the transverse moving base and the follower plate, which is used to limit the direction of the follower plate towards the first chuck. When preloading the wire, the connecting mechanism is triggered and the position of the follower plate is fixed. When twisting, the limiting mechanism can make the movement resistance of the follower plate towards the first chuck side gradually increase.

2. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 1, wherein A through groove is provided on the transverse moving base. The limiting mechanism includes two sliders slidably fitted in the through groove, and rollers are provided at the bottoms of the two sliders; it further includes a double-headed cylinder fixed to the bottom of the follower plate and two sets of yaw structures respectively connected to both ends of the double-headed cylinder, and the yaw structures cooperate with the rollers.

3. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 2, wherein, The yaw structure includes a rotating shaft rotatably installed on the follower plate and a follower arm fixed to the rotating shaft. An inclined portion is formed on the follower arm. The double-headed cylinder can drive the rotating shaft to drive the follower arm to perform a deflection action through a sliding fitting member; wherein, when the roller contacts the inclined portion, the central axes of the rotating shaft and the roller coincide.

4. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 3, wherein The two sliders are connected with an elastic support structure. The elastic support structure includes a cross bar fixed in the through groove. The cross bar penetrates through the two sliders and is slidably connected with the two sliders. A convex ring is further fixed on the cross bar, and a first spring sleeved on the outer periphery of the cross bar is connected to each side of the convex ring. The end of the first spring away from the convex ring abuts against the slider.

5. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 4, characterized in that, The sliding fitting member includes a driven arm fixed to the end of the rotating shaft away from the follower arm and a convex post fixed to the movable end of the double-headed cylinder. A strip-shaped groove adapted to the convex post is provided on the driven arm. The convex post penetrates through the strip-shaped groove and is slidably connected with the driven arm.

6. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 1, wherein, The preloading mechanism includes a loading hydraulic cylinder fixed to the side of the cabinet. The movable end of the loading hydraulic cylinder is connected to the transverse moving base through an elastic telescopic component. The loading hydraulic cylinder can cause the elastic telescopic component to move relative to the transverse moving base and trigger the connecting mechanism.

7. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 6, wherein The elastic telescopic component includes a cylinder fixed on the transverse moving base and a telescopic rod that is slidably sleeved with the cylinder 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 further provided between the telescopic rod and the cylinder.

8. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 7, characterized in that, The elastic member includes a convex platform fixed to the end of the telescopic rod away from the loading hydraulic cylinder and slidably fitted with the inner wall of the cylinder, and a second spring sleeved on the outer periphery of the telescopic rod and located inside the cylinder. One end of the second spring abuts against the convex platform, and the other end abuts against the inner wall of the cylinder.

9. The torsional fracture detection device for stainless steel wire based on bidirectional torsion according to claim 7, characterized in that, The connecting mechanism includes a lifting plate member provided on the side of the transverse movement seat and capable of lifting relative to the transverse movement seat. A clamping block adapted to the follower plate and arranged in a U-shaped manner is fixed to the bottom of the lifting plate member. Among them, the telescopic rod is fixedly connected with a connecting arm. A connecting rod is arranged between the connecting arm and the lifting plate member. The two ends of the connecting rod are respectively hinged to the connecting arm and the lifting plate member. Two braking hydraulic cylinders are also fixed to the side of the follower plate.

10. A method for detecting the torsional fracture of stainless steel wire rods, using the detection device as described in claim 1, characterized in that, It includes the following steps: Step 1: Clamp one end of the wire to be tested by using the first chuck. Drive the transverse movement seat and the follower plate to move synchronously by the preloading mechanism, so that the second chuck approaches the first chuck, and clamp the other end of the wire to be tested by using the second chuck. 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 towards the side of the first chuck. Step 5: The wire breaks, the test data is sorted out and analyzed, and the performance of the wire is evaluated.

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