A stainless steel microwire tensile testing device

Abstract

This application relates to the technical field of tensile testing devices, and discloses a tensile testing device for stainless steel microwires to solve the problems of stainless steel microwires breaking at the clamping deformation points at both ends and the impact of microwire skewness on the accuracy of test results. The end of the stainless steel microwire is inserted into an insertion groove. Rotating the fixed shaft causes the microwire to wind around the fixed shaft, fixing the end of the microwire in the insertion groove and preventing deformation caused by clamping. After the microwire has wound around to a certain extent, it squeezes part of the support column. When the un-squeezed support column pushes the squeezing block to the limit block, the support column is restricted by the squeezing block, and the position of the microwire end on the fixed shaft remains unchanged. This determines the position of the microwire ends on the upper and lower fixed shafts, ensuring that the microwire ends on the upper and lower fixed shafts are on the same vertical line, thus avoiding the impact of microwire skewness on the accuracy of the test results.

Description

Technical Field

[0001] This application relates to the field of tensile testing devices, and more particularly to a tensile testing device for stainless steel microwires. Background Technology

[0002] Stainless steel microwires possess excellent electrical and thermal conductivity, high strength, high elasticity, wear resistance, corrosion resistance, and thermal stability in oxidizing atmospheres. They are widely used in textiles, aerospace, military, medical, biochemical, modern industrial, modern civilian, and petrochemical industries. In the medical industry, to ensure that the strength of stainless steel microwires meets requirements and that their elastic properties meet standards, tensile testing devices are needed to test the tensile strength of the stainless steel microwires.

[0003] Existing stainless steel microwire tensile testing devices generally include a frame structure (base, column, and beam), clamping components, a transmission mechanism, and a force measurement system. Before testing the tensile strength of the stainless steel microwire, the clamping components are used to fix both ends of the microwire. Then, a power mechanism drives the upper clamping components to stretch the microwire, allowing the force measurement system to measure the tensile force during the stretching process. However, due to the small diameter of the stainless steel microwire, the clamping force of the clamping components can easily cause deformation of the clamped end of the microwire. During subsequent stretching, the microwire is prone to breakage at the deformed clamped location, thus affecting the accuracy of the tensile strength testing device. Furthermore, when the upper and lower clamping components clamp both ends of the microwire, it is difficult to ensure that the two ends are on the same vertical line. If the microwire becomes skewed during clamping, it will seriously affect the accuracy of the test results. Summary of the Invention

[0004] This application proposes a tensile testing device for stainless steel microwires, which has the advantages of preventing deformation at both ends of the stainless steel and avoiding skewness of the stainless steel microwires. This solves the problems of stainless steel microwires breaking at the deformation points at both ends and skewness affecting the accuracy of the test results.

[0005] To achieve the above objectives, this application adopts the following technical solution: a stainless steel microwire tensile testing device, comprising a frame structure, a movable frame, a force measurement system, and a fixing mechanism. The frame structure includes a base, a column, and a crossbeam. A transmission mechanism is provided inside the column. A control system is fixedly installed on the side wall of the base. The fixing mechanism includes: a connecting plate, one of which is fixedly connected to the base, and the other is fixedly connected to the movable end of the force measurement system; two side frames, respectively fixedly installed on both sides of the upper surface of the connecting plate; a fixing plate, fixedly installed on the connecting plate on the same side of the two side frames; and a fixing shaft, inserted into the two side frames, with one end penetrating through one of the side frames. The fixing shaft has an L-shaped insertion groove, which includes a horizontal groove and a vertical groove. The horizontal groove is located on the outer side wall of the fixing shaft, and the vertical groove penetrates the fixing shaft.

[0006] Furthermore, a rotating plate is hinged to the connecting plate on the other side of the two side frames.

[0007] Furthermore, a torsion bar is inserted into one end of the fixed shaft that passes through the side frame.

[0008] Furthermore, the fixed shaft is provided with: several mounting grooves, which are formed on the fixed shaft near the end of the horizontal groove of the insertion groove and arranged in a circular array; a connecting hole I, which is formed at the bottom of the mounting groove and connects several mounting grooves; a tension spring, one end of which is fixedly connected to the bottom of the mounting groove; a support column, which is fixedly connected to the other end of the tension spring, one end of which is slidably sealed and installed in the mounting groove, and the other end of which extends out of the mounting groove, and the mounting groove and connecting hole I at the bottom of the support column are filled with transmission fluid; the fixed plate has a sliding groove on the inner side wall of the mounting groove, and the sliding groove is provided with: a limiting block, which is fixedly installed on the side wall at the bottom of the sliding groove; a support spring, one end of which is fixedly connected to the middle position at the bottom of the sliding groove; and a pressing block, which is fixedly connected to the other end of the support spring, one end of which is slidably sealed and installed in the sliding groove, and the other end of which extends out of the sliding groove, and the end of the pressing block extending out of the sliding groove is a slope.

[0009] Furthermore, the end of the support column extending out of the mounting groove is provided with several slots.

[0010] Furthermore, a storage plate groove is formed on the inner side wall of the insertion slot, which is closely attached to the fixing plate. The storage plate groove is provided with: a plurality of return springs, one end of which is fixedly connected to the bottom end of the storage plate groove; a reinforcing plate, which is fixedly connected to the other end of the plurality of return springs, one end of which is slidably sealed in the storage plate groove, and the other end of which extends out of the storage plate groove; a connecting hole II is formed at the middle position of the bottom end of the sliding groove, which is used to connect the sliding groove at the bottom end of the extrusion block and the storage plate groove at the bottom end of the reinforcing plate. The sliding groove at the bottom end of the extrusion block and the storage plate groove at the bottom end of the reinforcing plate are filled with transmission fluid.

[0011] Furthermore, when the extrusion block abuts against the limiting block, the reinforcing plate will not slide out of the storage tank, and the end of the reinforcing plate extending out of the storage tank is exactly above the fixed shaft.

[0012] Furthermore, the position of the storage plate groove is higher than the uppermost position of the fixed shaft.

[0013] Furthermore, an elastic strip is fixedly embedded at the bottom of the end of the reinforcing plate that extends out of the storage tank.

[0014] Furthermore, the tension spring is always in a stretched state, and the support spring and the return spring are always in a stretched state.

[0015] This application has the following beneficial effects:

[0016] 1. The stainless steel microwire tensile testing device provided in this application inserts the end of the stainless steel microwire into the insertion groove when fixing the stainless steel microwire, and then rotates the fixing shaft to make the stainless steel microwire wind around the fixing shaft. The stainless steel microwire wound around the fixing shaft winds and fixes the end of the stainless steel microwire in the insertion groove, avoiding the use of clamping to fix the stainless steel microwire. This prevents the end of the stainless steel microwire from being clamped and deformed, and prevents the deformation of the end of the stainless steel microwire from breaking during tensile testing, which would affect the accuracy of the test results.

[0017] 2. The stainless steel microwire tensile testing device provided in this application, during the process of the stainless steel microwire being wound on a fixed shaft, after the stainless steel microwire has been wound to a certain extent, the stainless steel microwire squeezes the support column, causing the support column not squeezed by the stainless steel microwire to slide outward of the mounting groove. This causes the support column sliding outward of the mounting groove to push the squeezing block. When the squeezing block is pushed to the limit block by the support column sliding outward of the mounting groove, the support column cannot pass the squeezing block and continue to rotate with the fixed shaft. The position of the end of the stainless steel microwire on the fixed shaft no longer changes, thereby determining the position of the end of the stainless steel microwire on the upper and lower fixed shafts and ensuring that the end of the stainless steel microwire on the upper and lower fixed shafts is on the same vertical line, thereby avoiding the stainless steel microwire from being skewed and affecting the accuracy of the test results.

[0018] 3. The stainless steel microwire tensile testing device provided in this application, when the extrusion block slides towards the limiting block, the extrusion block extrudes the transmission fluid in the trough, and the transmission fluid enters the storage plate trough through the connecting hole II, pushing the reinforcing plate in the storage plate trough to move towards the upper end of the fixed shaft, thereby fixing the stainless steel microwire wound on the fixed shaft and preventing the wound stainless steel microwire from loosening and affecting the fixation of the end; and, during the tensile test, the reinforcing plate at the upper end of the fixed shaft supports the fixed shaft and prevents the fixed shaft from bending when the stainless steel microwire is stretched. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0020] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the fixing mechanism of the present invention;

[0023] Figure 3 This is a cross-sectional view of the fixing shaft in the fixing mechanism of the present invention;

[0024] Figure 4 This is a cross-sectional view of the fixing mechanism of the present invention from the mounting groove.

[0025] Figure 5 For the present invention Figure 4 Enlarged view of the local structure at point A in the middle;

[0026] Figure 6 This is a cross-sectional view of the fixing mechanism of the present invention from the reinforcing plate.

[0027] Figure 7 For the present invention Figure 6 Enlarged view of the local structure at point B in the middle.

[0028] In the diagram: 101, base; 102, column; 103, crossbeam; 104, control system; 2, moving frame; 3, force measurement system; 4, fixing mechanism; 401, connecting plate; 402, side frame; 403, fixing plate; 404, rotating plate; 405, fixed shaft; 406, insertion slot; 407, mounting slot; 408, connecting hole I; 409, tension spring; 410, support column; 411, slot; 412, slide groove; 413, limit block; 414, support spring; 415, pressing block; 416, storage plate groove; 417, return spring; 418, reinforcing plate; 419, torsion rod; 420, connecting hole II. Detailed Implementation

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application. Example

[0030] Please see Figure 1A stainless steel microwire tensile testing device includes a frame structure, a movable frame 2, a force measurement system 3, and a fixing mechanism 4. The frame structure includes a base 101, columns 102, and a crossbeam 103. Columns 102 are fixedly installed on both sides of the upper surface of the base 101. The tops of the two columns 102 are respectively fixedly connected to the two ends of the crossbeam 103. A transmission mechanism (an existing structure not shown in the figure) is provided inside the two columns 102. The output ends of the two transmission mechanisms are respectively fixedly connected to the two ends of the movable frame 2. The movable frame 2... Parallel to the crossbeam 103, a force measurement system 3 is fixedly connected to the middle position of the lower end face of the movable frame 2. The movable end of the force measurement system 3 faces downward. A fixing mechanism 4 is fixedly connected to the movable end of the force measurement system 3. A fixing mechanism 4 is fixedly installed at the middle position of the upper end face of the base 101. The fixing mechanism 4 on the force measurement system 3 and the fixing mechanism 4 on the base 101 are mirror images of each other. A control system 104 is fixedly installed on the side wall of the base 101. The control system 104 is used to control the transmission mechanism and the force measurement system 3.

[0031] Please see Figure 2 and Figure 3 The fixing mechanism 4 includes a connecting plate 401, side frames 402, a fixing plate 403, a rotating plate 404, and a fixing shaft 405. The connecting plate 401 of one fixing mechanism 4 is fixedly connected to the base 101, and the connecting plate 401 of the other fixing mechanism 4 is fixedly connected to the moving end of the force measurement system 3. Side frames 402 are fixedly installed on both sides of the upper surface of the connecting plate 401, and a fixing plate 403 is fixedly installed on the connecting plate 401 on the same side of both side frames 402. The fixed plate 403 is fixedly connected to the side wall of the side frame 402. A rotating plate 404 is hinged to the connecting plate 401 on the other side of the two side frames 402. A fixed shaft 405 is inserted into the two side frames 402. One end of the fixed shaft 405 passes through one of the side frames 402. An L-shaped insertion groove 406 is opened on the fixed shaft 405. The insertion groove 406 includes a horizontal groove and a vertical groove. The horizontal groove is located on the outer side wall of the fixed shaft 405 and is parallel to the fixed shaft 405. The vertical groove passes through the fixed shaft 405.

[0032] A torsion bar 419 is inserted into one end of the fixed shaft 405 that passes through the side frame 402; the fixed shaft 405 is rotated by the torsion bar 419, which facilitates the rotation of the fixed shaft 405.

[0033] The working principle of Embodiment 1 of the present invention is as follows:

[0034] Please see Figures 1-3When fixing the end of the stainless steel microwire, rotate the rotating plate 404 to expose the fixing shaft 405. One end of the stainless steel microwire passes through the vertical groove of the insertion groove 406 and is located in the horizontal groove of the insertion groove 406. At this time, the fixing shaft 405 is rotated by turning the torsion rod 419. The rotating fixing shaft 405 drives the stainless steel microwire to move, so that the stainless steel microwire is wound around the fixing shaft 405. The stainless steel microwire wound around the fixing shaft 405 fixes the stainless steel microwire in the horizontal groove of the insertion groove 406, avoiding the use of clamping to fix the stainless steel microwire. This prevents the end of the stainless steel microwire from being clamped and deformed, and prevents the deformation at the end of the stainless steel microwire from breaking during tensile testing, which would affect the accuracy of the test results. Example

[0035] Example 2 is a further improvement based on Example 1.

[0036] Unlike Example 1, please refer to Figures 3-5 A plurality of mounting slots 407 arranged in a circular array are provided on the fixed shaft 405 near the end of the transverse groove of the insertion slot 406, and the mounting slots 407 are located between the two side brackets 402. The bottom end of the mounting slots 407 is provided with a connecting hole I 408 connecting the plurality of mounting slots 407. A tension spring 409 is fixedly connected to the bottom end of the mounting slot 407, and a support column 410 is fixedly connected to the other end of the tension spring 409. One end of the support column 410 is slidably sealed and installed in the mounting slot 407, and the other end of the support column 410 extends out of the mounting slot 407. The mounting groove 407 and the connecting hole I 408 at the bottom of the 0 are filled with transmission fluid; the fixing plate 403 is provided with a sliding groove 412 on the inner side wall of the mounting groove 407, a limit block 413 is fixedly installed on the side wall at the bottom of the sliding groove 412, a support spring 414 is fixedly connected to the middle position at the bottom of the sliding groove 412, and a pressing block 415 is fixedly connected to the other end of the support spring 414. One end of the pressing block 415 is slidably sealed in the sliding groove 412, and the other end of the pressing block 415 extends out of the sliding groove 412. The end of the pressing block 415 extending out of the sliding groove 412 is a slope.

[0037] Please see Figure 5 The support column 410 has several slots 411 at one end extending from the mounting groove 407. When the stainless steel microwire is wound from the fixed shaft 405 onto the support column 410, the slots 411 facilitate the positioning of the stainless steel and prevent the stainless steel microwire from slipping off the end of the support column 410.

[0038] Please see Figure 3 , Figure 6 and Figure 7A storage plate groove 416 is formed on the inner side wall of the insertion groove 406, which is closely attached to the fixing plate 403. Several return springs 417 are fixedly connected to the bottom end of the storage plate groove 416. The other ends of the return springs 417 are fixedly connected to the same reinforcing plate 418. One end of the reinforcing plate 418 is slidably sealed inside the storage plate groove 416, and the other end of the reinforcing plate 418 extends out of the storage plate groove 416. (See also...) Figure 4 and Figure 5 A connecting hole II 420 is provided at the middle position of the bottom end of the chute 412. The connecting hole II 420 is used to connect the chute 412 at the bottom end of the extrusion block 415 and the storage plate groove 416 at the bottom end of the reinforcing plate 418. The chute 412 at the bottom end of the extrusion block 415 and the storage plate groove 416 at the bottom end of the reinforcing plate 418 are filled with transmission fluid. When the extrusion block 415 abuts against the limiting block 413, the reinforcing plate 418 will not slide out of the storage plate groove 416, and the end of the reinforcing plate 418 extending out of the storage plate groove 416 is exactly above the fixed shaft 405.

[0039] Please see Figure 6 The position of the storage plate trough 416 is higher than the top of the fixed shaft 405; when the reinforcing plate 418 of the storage plate trough 416 slides above the fixed shaft 405, it is ensured that the fixed shaft 405 and the stainless steel microwires on the fixed shaft 405 will not obstruct the movement of the reinforcing plate 418.

[0040] An elastic strip is fixedly embedded at the bottom of one end of the reinforcing plate 418 extending out of the storage plate groove 416; when the reinforcing plate 418 extends to the fixed shaft 405 on which the stainless steel microwire is wound, the elastic strip on the reinforcing plate 418 is in close contact with the stainless steel microwire to prevent damage to the stainless steel microwire, and the elastic strip on the reinforcing plate 418 is in close contact with the stainless steel microwire on the fixed shaft 405.

[0041] The tension spring 409 is always in a stretched state. The stretched tension spring 409 exerts a pulling force on the support column 410, so that the lengths of the support columns 410 extending out of the mounting groove 407 are the same. The support spring 414 and the return spring 417 are always in a stretched state. The pulling force of the support spring 414 and the return spring 417 is used to balance the position of the pressing block 415 and the reinforcing plate 418. When there is no external force, the pressing block 415 and the reinforcing plate 418 are prevented from affecting the winding of the stainless steel microwire by the fixed shaft 405.

[0042] The working principle of Embodiment 2 of the present invention is as follows:

[0043] Please see Figures 1-7During the process of the stainless steel microwire being wound onto the fixed shaft 405, the stainless steel microwire wound onto the fixed shaft 405 gradually moves towards the support column 410 until the stainless steel microwire is pressed into the groove 411 at the end of the support column 410, causing the support column 410 to move into the mounting groove 407. As the fixed shaft 405 rotates, more and more support columns 410 are squeezed into the mounting groove 407. The squeezed support columns 410 push the transmission fluid in the mounting groove 407 through the connecting hole I 408 into the mounting groove 407 of the unsqueezed support columns 410, pushing the unsqueezed support columns 410 in the mounting groove 407 to move out of the mounting groove 407. As the fixed shaft 405 drives the support column 410 to rotate, the extension... The support column 410 of the mounting slot 407 pushes the extrusion block 415 until the extension of the support column 410 pushes the extrusion block 415. At this time, the extrusion block 415 is pushed against the limit block 413, and the support column 410 can no longer pass the extrusion block 415 to continue rotating. At this time, the position of one end of the stainless steel microwire in the slot 411 on the support column 410 is determined. After the other end of the stainless steel microwire is fixed in the same way, the position of the other end of the stainless steel microwire in the slot 411 on the support column 410 is also determined. At this time, the position of the ends of the stainless steel microwire on the upper and lower fixed shafts 405 is determined, ensuring that the ends of the stainless steel microwire on the upper and lower fixed shafts 405 are on the same vertical line, thereby avoiding the stainless steel microwire from being skewed and affecting the accuracy of the test results.

[0044] Furthermore, during the process of the extrusion block 415 being pressed towards the limiting block 413 by the support column 410, the extrusion block 415 extrudes the transmission fluid in the slide groove 412. The transmission fluid enters the storage plate tank 416 through the connecting hole II 420. The transmission fluid entering the storage plate tank 416 pushes the reinforcing plate 418 to move outward from the storage plate tank 416. When the extrusion block 415 abuts against the limiting block 413, the protruding end of the reinforcing plate 418 is just stuck on the stainless steel microwire wound on the fixed shaft 405, fixing the stainless steel microwire wound on the fixed shaft 405 and preventing the wound stainless steel microwire from loosening and affecting the fixation of the end. During the tensile test, the reinforcing plate 418 at the upper end of the fixed shaft 405 supports the fixed shaft 405 and prevents the fixed shaft 405 from bending when the stainless steel microwire is stretched.

Claims

1. A stainless steel microwire tensile testing device, comprising a frame structure, a movable frame (2), a force measurement system (3), and a fixing mechanism (4), wherein the frame structure comprises a base (101), a column (102), and a crossbeam (103), wherein a transmission mechanism is provided inside the column (102), and a control system (104) is fixedly installed on the side wall of the base (101), characterized in that: The fixing mechanism (4) includes: Connecting plates (401), one of which is fixedly connected to the base (101), and the other of which is fixedly connected to the moving end of the force measurement system (3); Two side frames (402) are fixedly installed on both sides of the upper end face of the connecting plate (401); The fixing plate (403) is fixedly installed on the connecting plate (401) on the same side of the two side frames (402); A fixed shaft (405) is inserted into two side frames (402), with one end passing through one of the side frames (402). An L-shaped insertion groove (406) is provided on the fixed shaft (405). The insertion groove (406) includes a horizontal groove and a vertical groove. The horizontal groove is located on the outer side wall of the fixed shaft (405), and the vertical groove passes through the fixed shaft (405). The fixed shaft (405) is provided with: Several mounting slots (407) are provided on the fixed shaft (405) near the end of the transverse slot of the insertion slot (406) and are arranged in a ring array; A connecting hole I (408) is provided at the bottom end of the mounting slot (407) and connects several mounting slots (407). A tension spring (409) is fixedly connected at one end to the bottom end of the mounting groove (407); A support column (410) is fixedly connected to the other end of a tension spring (409). One end of the support column (410) is slidably sealed in the mounting groove (407), and the other end of the support column (410) extends out of the mounting groove (407). The mounting groove (407) and the connecting hole I (408) at the bottom of the support column (410) are filled with transmission fluid. The fixing plate (403) has a sliding groove (412) on its inner side wall that is in close contact with the mounting groove (407). The sliding groove (412) is provided with: The limiting block (413) is fixedly installed on the side wall at the bottom end of the slide (412); The support spring (414) is fixedly connected at one end to the middle position of the bottom end of the slide groove (412); The extrusion block (415) is fixedly connected to the other end of the support spring (414). One end of the extrusion block (415) is slidably sealed in the groove (412), and the other end of the extrusion block (415) extends out of the groove (412). The end of the extrusion block (415) extending out of the groove (412) is a slope. The support column (410) has several slots (411) at one end extending out of the mounting groove (407); The fixing plate (403) has a storage plate groove (416) on the inner side wall of the horizontal groove of the insertion groove (406) in close contact with it. The storage plate groove (416) is provided with: Several return springs (417) are fixedly connected at one end to the bottom end of the storage plate groove (416); A reinforcing plate (418) is fixedly connected to the other end of several reset springs (417). One end of the reinforcing plate (418) is slidably and sealed inside the storage plate groove (416), and the other end of the reinforcing plate (418) extends out of the storage plate groove (416). A connecting hole II (420) is provided at the middle position of the bottom end of the chute (412). The connecting hole II (420) is used to connect the chute (412) at the bottom end of the extrusion block (415) and the storage plate groove (416) at the bottom end of the reinforcing plate (418). The chute (412) at the bottom end of the extrusion block (415) and the storage plate groove (416) at the bottom end of the reinforcing plate (418) are filled with transmission fluid. When the extrusion block (415) abuts against the limiting block (413), the reinforcing plate (418) will not slide out of the storage plate groove (416), and the end of the reinforcing plate (418) extending out of the storage plate groove (416) is just above the fixed shaft (405). The position of the storage plate groove (416) is higher than the uppermost position of the fixed shaft (405); An elastic strip is fixedly embedded at the bottom of the reinforcing plate (418) extending out of the storage plate groove (416); The tension spring (409) is always in a stretched state, and the support spring (414) and the return spring (417) are always in a stretched state.

2. The stainless steel microwire tensile testing device according to claim 1, characterized in that: A rotating plate (404) is hinged to the connecting plate (401) on the other side of the two side frames (402).

3. The stainless steel microwire tensile testing device according to claim 1, characterized in that: A torsion bar (419) is inserted into one end of the fixed shaft (405) that passes through the side frame (402).

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