Stitched fiber friction measuring device

Abstract

The utility model discloses a stitched fiber friction measuring device, which comprises a main body assembly and a bottom frame, a height-adjustable guide rail is connected above the bottom frame, and a connecting frame is fixed on the bottom frame at one end of the guide rail in the left-right direction; the testing assembly comprises a pressure sensor movably connected to the guide rail, a first clamp used for clamping sewing fibers is fixed to the pressure sensor, a height-adjustable positioning rail is connected into the connecting frame, two sliding blocks which simultaneously move in the same direction or in the opposite directions in the height direction are connected into the connecting frame, and fabric is connected between the two sliding blocks. A positioning plate is further fixed on the connecting frame, a plurality of positioning holes which are arranged at intervals in the height direction are formed in the positioning plate, a sliding groove is formed in the upper end of the positioning rail, a guide part is fixed on the positioning rail at one end, close to the sliding block, of the sliding groove, and a guide hole is formed in the guide part. According to the utility model, the measurement of the sliding friction force under the continuous change of the in-plane shear angle of the fabric can be realized, and the measurement of the sliding friction force under different sewing angles can also be realized.

Description

Technical Field

[0001] This utility model relates to the field of suture technology, and in particular to a suture fiber friction measuring device. Background Technology

[0002] Three-dimensional composite materials have significant application value in aerospace, automotive, and defense industries due to their excellent mechanical properties, lightweight characteristics, and impact resistance. Compared with traditional two-dimensional composite materials, three-dimensional composite materials significantly improve interlaminar strength and anti-delamination performance through fiber reinforcement in the thickness direction (Z-direction), thus exhibiting higher reliability under complex load environments. Stitching (such as stitching and tufting) is an efficient method for enhancing the interlaminar properties of composite materials. By stitching fibers through the thickness direction of the preform, it enhances interlaminar bonding while maintaining in-plane properties and improving impact and fatigue resistance. Compared with traditional three-dimensional braiding or three-dimensional weaving, stitching technology has the advantages of flexible processes and lower costs, and is particularly suitable for manufacturing large-sized, curved-shaped components.

[0003] On the other hand, the preforming process in liquid molding technology allows for the batch stamping of planar fabrics into curved parts, significantly improving the efficiency of composite material preform fabrication and ensuring the forming quality. During the composite material preforming process, the originally regularly interlaced fiber bundles undergo significant slippage, bending, or rotation, altering their distribution and orientation, and consequently changing the load-bearing path of the final composite part. Finite element numerical simulation can be used to predict these changes in fiber bundle paths during preforming, providing a sound theoretical basis for product design and thus significantly reducing product development cycles and costs.

[0004] However, the numerical model for three-dimensional stitched composite preforms must consider not only in-plane shear deformation, out-of-plane bending deformation, and fabric-to-fabric friction, but also the further constraint of lateral slippage of the fabric by the stitching fibers in the thickness direction through friction. This frictional behavior is also influenced by factors such as the in-plane shear angle and stitching angle, posing significant challenges to establishing accurate numerical models. Research on the frictional behavior between stitching fibers and fabrics is crucial for the mechanics of forming processes and for improving the accuracy of numerical models. Currently, there is no equipment available to test the friction between stitching fibers and fabrics; therefore, a friction measurement device is urgently needed to measure the sliding friction force between stitching fibers and fabrics. Utility Model Content

[0005] In view of the problems existing in the current method of sewing fabrics, this utility model is proposed.

[0006] Therefore, the problem to be solved by this utility model is the cumbersome clamping operation. This utility model can realize the measurement of sliding friction force under continuous change of in-fabric shear angle, and can also realize the measurement of sliding friction force under different sewing angles.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a suture fiber friction measuring device, comprising,

[0008] The main component includes a base frame, on which a height-adjustable guide rail is connected. A connecting frame is fixedly connected to one end of the base frame in the left-right direction.

[0009] The testing assembly includes a pressure sensor movably connected to a guide rail, a first clamp for clamping the sewing fibers fixedly connected to the pressure sensor, a height-adjustable positioning rail connected within the connecting frame, two sliders that move simultaneously towards or away from each other in the height direction connected within the connecting frame between the positioning rail and the guide rail in the left-right direction, a fabric connected between the two sliders, a positioning plate fixedly connected to the connecting frame between the sliders and the guide rail, the positioning plate having several positioning holes spaced apart in the height direction, a groove for the sewing fibers to move at the upward end of the positioning rail, a guide part fixedly connected to the positioning rail at the end of the groove close to the slider, and a guide hole for the sewing fibers to pass through the guide part.

[0010] In a preferred embodiment of the suture fiber friction measuring device of this utility model, the device further includes a first lifting assembly. The first lifting assembly includes a first base plate fixedly connected to the upper side of the base frame. A first top plate that can move up and down is connected above the first base plate. The first top plate is fixedly connected to the lower side of the guide rail. Two first scissor plates that are spaced apart in the front-back direction are hinged to the lower end of the first top plate. Two second scissor plates that are spaced apart in the front-back direction are movably connected to the lower end of the first top plate. The centers of the first scissor plates and the second scissor plates are hinged together. The lower ends of the two first scissor plates are movably connected to the first base plate, and the lower ends of the second scissor plates are hinged to the first base plate.

[0011] In a preferred embodiment of the suture fiber friction measuring device of this utility model, a first moving block is slidably connected to the lower side of the first top plate, the upper ends of the two second scissor plates are respectively hinged to the front and rear sides of the first moving block, a first transmission component is fixedly connected to one end of the first top plate in the left-right direction, a first lifting screw is horizontally connected to the first transmission component, the first moving block is threadedly connected to the first lifting screw, and the end of the first lifting screw away from the first transmission component is rotatably connected to the first top plate.

[0012] In a preferred embodiment of the suture fiber friction measuring device of this utility model, a second lifting assembly is further included. The second lifting assembly includes a second base plate fixedly connected to the upper side of the base frame, a second top plate fixedly connected to the lower side of the positioning rail, two third scissor plates that are spaced apart and connected together in the front-rear direction are hinged to the lower end of the second top plate, the lower ends of the third scissor plates are movably connected to the third base plate, and two fourth scissor plates that are spaced apart and connected together in the front-rear direction are movably connected to the lower end of the second top plate, the lower ends of the fourth scissor plates are hinged to the second base plate, and the centers of the third and fourth scissor plates are hinged together.

[0013] In a preferred embodiment of the suture fiber friction measuring device of this utility model, a second transmission component is fixedly connected to one end of the second top plate in the left-right direction, a second lifting screw is rotatably connected to the second transmission component on the second top plate, a second moving block is threadedly connected to the second lifting screw and slidably connected to the lower side of the second top plate, and two fourth scissor plates are respectively hinged to the front and rear sides of the second moving block.

[0014] In a preferred embodiment of the suture fiber friction measuring device of this utility model, the test assembly further includes a clamping unit for clamping the fabric. The clamping unit includes a first upper connecting plate and a second upper connecting plate hinged to the upper slider. The lower ends of the first upper connecting plate and the second upper connecting plate are respectively hinged to a first lower connecting plate and a second lower connecting plate. The lower ends of the first lower connecting plate and the second lower connecting plate are hinged together and both are hinged to the lower slider. The first upper connecting plate, the first lower connecting plate, the second lower connecting plate, and the second upper connecting plate are parallelograms.

[0015] In a preferred embodiment of the suture fiber friction measuring device of this utility model, a second clamp is fixedly connected to the first upper connecting plate, the second upper connecting plate, the first lower connecting plate and the second lower connecting plate, and the four second clamps clamp the fabric.

[0016] In a preferred embodiment of the suture fiber friction measuring device of this utility model, two columns spaced apart in the front-rear direction are fixedly connected within the connecting frame. A transmission screw is rotatably connected to each column. A first lifting block and a second lifting block are threadedly connected to the transmission screw. The upper and lower threads of the transmission screw are in opposite directions. The first lifting block and the second lifting block move synchronously towards each other or away from each other. The upper slider is fixedly connected to the two first lifting blocks, and the lower slider is fixedly connected to the two second lifting blocks.

[0017] In a preferred embodiment of the suture fiber friction measuring device of this utility model, a drive motor is fixedly connected to the upper side of the column, and the drive motor is connected to the corresponding drive screw. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is the front view of the present invention.

[0020] Figure 2 The three-dimensional structure of this utility model Figure 1 .

[0021] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle.

[0022] Figure 4 The three-dimensional structure of this utility model Figure 2 .

[0023] Figure 5 for Figure 4 Enlarged view of the structure at point B in the middle.

[0024] Figure 6 This is a structural diagram showing the fabric being held in the second clamp in its initial state.

[0025] Figure 7 This is a structural diagram showing the fabric being clamped onto a second fixture after being cut and deformed.

[0026] Figure 8 This is a three-dimensional structural diagram of the first lifting component in this utility model.

[0027] Figure 9 This is a three-dimensional structural diagram of the second lifting component in this utility model.

[0028] In the diagram: 100 Main component, 101 Connecting frame, 102 Moving plate, 103 Guide rail, 104 Base frame, 200 First lifting component, 201 First calibration scale, 202 Second scissor lift plate, 203 First scissor lift plate, 204 First base plate, 205 First scale, 206 First top plate, 207 First lifting screw, 208 First moving block, 209 First transmission component, 210 First knob, 300 Testing component, 301 Pressure sensor, 302 First clamp, 3021 Pressure plate, 3022 Support plate, 303 Positioning plate, 303-1 Positioning hole, 304 Positioning post, 305 Second clamp, 3051 Left clamping plate, 3051-1 Clamping teeth, 3052 Right clamping plate, 30 52-1 Gripping groove, 306 First upper connecting plate, 307 Second upper connecting plate, 308 Second lower connecting plate, 309 First lower connecting plate, 310 Positioning rail, 310-1 Slide groove, 310-2 Guide part, 311 Drive motor, 312 Drive screw, 313 Column, 314 First lifting block, 315 Second lifting block, 316 Sliding block, 400 Second lifting assembly, 401 Second base plate, 402 Movable block, 403 Fourth scissor plate, 404 Third scissor plate, 405 Second top plate, 406 Second moving block, 407 Second lifting screw, 408 Second transmission component, 409 Second knob, 410 Second scale, 411 Second calibration scale, 500 Fabric, 600 Sewing fiber. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0032] Example 1: Refer to Figures 1-3 This is the first embodiment of the present invention. This embodiment provides a suture fiber friction measuring device, which can assist in the testing of the friction force between the suture fiber 600 and the fabric 500.

[0033] A friction measuring device for suture fiber 600 includes a main assembly 100 and a testing assembly 300. The main assembly 100 includes a base frame 104, with a height-adjustable guide rail 103 connected above the base frame 104. A connecting frame 101 is fixedly connected to one end of the base frame 104 in the left-right direction. The testing assembly 300 includes a movable plate 102 (which is prior art) slidably connected to the guide rail 103. A pressure sensor 301 is movably connected to the upper side of the movable plate 102 and to the right of the pressure sensor 301. A first clamp 302 for clamping suture fiber 600 is fixedly connected to the movable plate 102 to the right of the pressure sensor 301. (The first clamp 302 includes a support plate 3022 fixedly connected to the movable plate 102 to the right of the pressure sensor 301, with a pressure plate 3021 fixedly connected to the upper side of the support plate 3022.) 00 is pressed by the pressure plate 3021 on the upper side of the support plate 3022), and the connecting frame 101 is connected to a height-adjustable positioning rail 310. In the left and right direction, there are two sliders 316 connected in the connecting frame 101 between the positioning rail 310 and the guide rail 103. The sliders 316 move towards or away from each other in the height direction. The fabric 500 is connected between the two sliders 316. The positioning plate 303 is fixedly connected to the connecting frame 101 between the sliders 316 and the guide rail 103. The positioning plate 303 has a number of positioning holes 303-1 spaced apart in the height direction. The upward end of the positioning rail 310 has a groove 310-1 for the sewing fiber 600 to move. The groove 310-1 is close to the end of the positioning rail 310 of the slider 316. The guide part 310-2 has a guide hole for the sewing fiber 600 to pass through.

[0034] In the initial state, the sewing fiber 600 is placed in the rear slide groove 310-1, passes through the guide hole on the guide part 310-2 at the end of the slide groove 310-1, then passes through the center point of the fabric 500, then passes through the positioning hole 303-1 of the positioning plate 303, and then connects to the first clamp 302. The height of the guide rail 103 and the positioning rail 310 is adjusted to ensure that the sewing fiber 600 between the positioning hole 303-1 and the first clamp 302 is in a horizontal state. Then the height of the rear positioning rail 310 is adjusted to ensure that the sewing fiber 600 between the positioning hole 303-1 and the guide hole is in a straight line. The moving plate 102 (guide rail 103 and moving plate 302) is set. The moving plate 102 is part of the sewing device (in the prior art). The operating speed is tested first to measure the friction between the sewing fiber 600 and the positioning hole 303-1 and guide hole under no-load conditions. At this time, there is no fabric 500 between the two sliders 316. After the test, the fabric 500 is connected between the two sliders 316, the moving plate 102 is reset to the initial position, and the test is started again. The friction on the sewing fiber 600 is detected by the pressure sensor 301. Finally, the friction between the sewing fiber 600 and the fabric 500 is determined by combining the friction under no-load conditions. This embodiment can help to realize the friction test between the sewing fiber 600 and the fabric 500.

[0035] Specifically, it also includes a first lifting assembly 200, which includes a first base plate 204 fixedly connected to the upper side of the base frame 104. A first top plate 206 movable up and down is connected above the first base plate 204. The first top plate 206 is fixedly connected to the lower side of the guide rail 103. Two first scissor plates 203 spaced apart in the front-rear direction are hinged to the lower end of the first top plate 206. Two second scissor plates 202 spaced apart in the front-rear direction are movably connected to the lower end of the first top plate 206. The centers of the first scissor plates 203 and the second scissor plates 202 are hinged together, and the lower ends of the two first scissor plates 203 are movable. The lower end of the second scissor plate 202 is hinged to the first base plate 204. The lower side of the first top plate 206 is slidably connected to the first moving block 208. The upper ends of the two second scissor plates 202 are respectively hinged to the front and rear sides of the first moving block 208. The first transmission member 209 is fixedly connected to one end of the first top plate 206 in the left-right direction. The first transmission member 209 is connected to the first horizontally set first lifting screw 207. The first moving block 208 is threadedly connected to the first lifting screw 207. The end of the first lifting screw 207 away from the first transmission member 209 is rotatably connected to the first top plate 206.

[0036] In this embodiment, the first transmission component 209 is preferably a first rotating disk, on which a convenient first knob 210 is connected. Under normal circumstances, the first rotating disk is fixed to the right side of the first top plate 206; a first scale 205 is fixedly connected to the front side of the first top plate 206, and a first calibration scale 201 to the left of the first scale 205 is fixedly connected to the front side of the first bottom plate 204; when the height of the guide rail 103 needs to be adjusted, the first knob 210 is held to rotate the first rotating disk, which drives the first lifting screw 207 to rotate. 07 The first moving block 208 drives the second scissor plates 202 on both the front and rear sides to swing. The second scissor plates 202 drive the corresponding first scissor plates 203 to swing. The first scissor plates 203 and the second scissor plates 202 drive the first top plate 206 to move in the height direction. When the first top plate 206 drives the first clamp 302 to rise and fall to a suitable height, stop rotating the first knob 210 and fix the first rotating disk to the side of the first top plate 206 (how to fix it is conventional technology, such as using fastening screws to pass through the connecting holes on the first rotating disk and screw into the side of the first top plate 206).

[0037] Specifically, it also includes a second lifting assembly 400, which includes a second base plate 401 fixedly connected to the upper side of the base frame 104, a second top plate 405 fixedly connected to the lower side of the positioning rail 310, two third scissor plates 404 that are spaced apart and connected together in the front-rear direction hinged to the lower end of the second top plate 405, a movable block 402 slidably connected to the upper side of the third base plate, the lower ends of the two third scissor plates 404 being respectively hinged to the front and rear sides of the movable block 402, and two third scissor plates 404 that are spaced apart and connected together in the front-rear direction movably connected to the lower end of the second top plate 405. The fourth scissor plate 403 is hinged at its lower end to the second base plate 401. The third scissor plate 404 and the fourth scissor plate 403 are hinged together at their centers. The second top plate 405 is fixedly connected to one end in the left-right direction with a second transmission member 408. The second transmission member 408 is connected to a second lifting screw 407 that is rotatably connected to the second top plate 405. The second lifting screw 407 is threadedly connected to a second moving block 406 that is slidably connected to the lower side of the second top plate 405. The two fourth scissor plates 403 are respectively hinged to the front and rear sides of the second moving block 406.

[0038] The second transmission component 408 is preferably a second rotating disk, on which a second knob 409 for easy operation is connected. Under normal circumstances, the second rotating disk is fixed to the right side of the second top plate 405. A second scale 410 is fixedly connected to the front side of the second top plate 405, and a second calibration scale 411 is fixedly connected to the left side of the second scale 410 to the front side of the second bottom plate 401. Before testing, the height of the positioning rail 310 needs to be adjusted. The adjustment process is similar to that of adjusting the height of the guide rail 103, and will not be described in detail here.

[0039] When it is necessary to measure the frictional force at different stitching angles, the stitching fiber 600 can be passed through different positioning holes 303-1 to assist in the testing of the frictional force between the stitching fiber 600 and the fabric 500 at the corresponding stitching angle, thus expanding the applicability.

[0040] Example 2: Refer to Figure 2 and Figure 3 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment and can also assist in testing the frictional force between the sewing fiber 600 and the fabric 500 when the fabric 500 undergoes shear deformation.

[0041] Specifically, the test assembly 300 also includes a clamping unit for clamping the fabric 500. The clamping unit includes a first upper connecting plate 306 and a second upper connecting plate 307 hinged together to the upper slider 316. The lower ends of the first upper connecting plate 306 and the second upper connecting plate 307 are respectively hinged to a first lower connecting plate 309 and a second lower connecting plate 308. The lower ends of the first lower connecting plate 309 and the second lower connecting plate 308 are hinged together and both are hinged to the lower slider 316. The first upper connecting plate 306, the first lower connecting plate 309, the second lower connecting plate 308, and the second upper connecting plate 307 are parallelograms. Second clamps 305 are fixedly connected to the first upper connecting plate 306, the second upper connecting plate 307, the first lower connecting plate 309, and the second lower connecting plate 308. There are four second clamps 305. The fabric 500 is clamped. The second clamp 305 includes a left clamping plate 3051 and a right clamping plate 3052. The left side of the right clamping plate 3052 has several clamping grooves 3052-1, and the right side of the left clamping plate 3051 has several clamping teeth 3051-1 corresponding to the clamping grooves 3052-1. The fabric 500 is clamped in several clamping grooves 3052-1 around its perimeter. Then, fixing bolts are screwed into the fixing holes on the left clamping plate 3051 and the right clamping plate 3052 in sequence, so that the fabric 500 is clamped by four second clamps 305 around its perimeter. The two upper right clamping plates 3052 are fixedly connected to the outside of the first upper connecting plate 306 and the second upper connecting plate 307, respectively. The two lower right clamping plates 3052 are fixedly connected to the outside of the first lower connecting plate 309 and the second lower connecting plate 308.

[0042] Initially, the parallelogram is a square. The fabric 500 is carbon fiber. At the front end facing upwards and the rear end facing downwards, several positioning posts 304 pass through holes in the carbon fiber and connect to the first upper connecting plate 306 and the second lower connecting plate 308, respectively. The center lines connecting the upper and lower positioning posts 304 are parallel to the length of the second clamp 305, which is perpendicular to the warp and weft threads of the fabric 500. When the fabric 500 needs to be sheared and deformed, the two sliders 316 move. The upper slider 316 causes the first upper connecting plate 306 and the second upper connecting plate 307 to swing, while the lower slider 316 causes the first lower connecting plate 309 and the second lower connecting plate 308 to swing. For example, when the two slides move in opposite directions, the distance between the two slides 316 increases, the first upper connecting plate 306 and the second upper connecting plate 307 swing towards each other, and the first lower connecting plate 309 and the second lower connecting plate 308 swing towards each other, causing the fabric 500 to deform. When the fabric 500 undergoes shear deformation, the fibers of the fabric 500 will rotate around the positioning post 304, thereby ensuring that the fibers between the positioning post 304 and the second clamp 305 are always perpendicular to the clamp, preventing sliding perpendicular to the fiber direction. When the fabric 500 is deformed to a suitable angle, the slide 316 stops moving, realizing the adjustment of the amount of shear deformation of the fabric 500. Through this embodiment, it is possible to assist in the testing of the friction force between the fabric 500 and the sewing fiber 600 under different shear angles in the fabric 500 plane.

[0043] Specifically, two columns 313 are fixedly connected in the connecting frame 101, spaced apart in the front-rear direction. A transmission screw 312 is rotatably connected to the column 313. A first lifting block 314 and a second lifting block 315 are threadedly connected to the transmission screw 312. The upper and lower threads of the transmission screw 312 are in opposite directions. The first lifting block 314 and the second lifting block 315 move synchronously towards each other or away from each other. The upper slider 316 is fixedly connected to the two first lifting blocks 314, and the lower slider 316 is fixedly connected to the two second lifting blocks 315. A transmission motor 311 is fixedly connected to the upper side of the column 313, and the transmission motor 311 is connected to the corresponding transmission screw 312.

[0044] The specific process of adjusting the position of slider 316 is as follows: control the two drive motors 311 to operate, the two drive screws 312 rotate simultaneously, the drive screws 312 drive the two sliders 316 to move, control the direction of operation of the drive motors 311 to make the two sliders 316 face each other or move away from each other, and when the sliders 316 move to the required position, the drive motors 311 stop operating.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for measuring the friction of suture fibers, characterized in that: include, The main component includes a base frame, on which a height-adjustable guide rail is connected. A connecting frame is fixedly connected to one end of the base frame in the left-right direction. The testing assembly includes a pressure sensor movably connected to a guide rail, a first clamp for clamping the sewing fibers fixedly connected to the pressure sensor, a height-adjustable positioning rail connected within the connecting frame, two sliders that move simultaneously towards or away from each other in the height direction connected within the connecting frame between the positioning rail and the guide rail in the left-right direction, a fabric connected between the two sliders, a positioning plate fixedly connected to the connecting frame between the sliders and the guide rail, the positioning plate having several positioning holes spaced apart in the height direction, a groove for the sewing fibers to move at the upward end of the positioning rail, a guide part fixedly connected to the positioning rail at the end of the groove close to the slider, and a guide hole for the sewing fibers to pass through the guide part.

2. The suture fiber friction measuring device as described in claim 1, characterized in that: It also includes a first lifting assembly, which includes a first base plate fixedly connected to the upper side of the base frame, a first top plate that can move up and down connected above the first base plate, the first top plate being fixedly connected to the lower side of the guide rail, two first scissor plates that are spaced apart in the front-back direction being hinged to the lower end of the first top plate, and two second scissor plates that are spaced apart in the front-back direction being movably connected to the lower end of the first top plate, the centers of the first scissor plates and the second scissor plates being hinged together, the lower ends of the two first scissor plates being movably connected to the first base plate, and the lower ends of the second scissor plates being hinged to the first base plate.

3. The suture fiber friction measuring device as described in claim 2, characterized in that: A first moving block is slidably connected to the lower side of the first top plate. The upper ends of the two second scissor plates are respectively hinged to the front and rear sides of the first moving block. A first transmission component is fixedly connected to one end of the first top plate in the left-right direction. A first lifting screw is horizontally connected to the first transmission component. The first moving block is threadedly connected to the first lifting screw. The end of the first lifting screw away from the first transmission component is rotatably connected to the first top plate.

4. The suture fiber friction measuring device as described in claim 1, characterized in that: It also includes a second lifting assembly, which includes a second base plate fixedly connected to the upper side of the base frame, a second top plate fixedly connected to the lower side of the positioning rail, two third scissor plates that are spaced apart and connected together in the front-rear direction are hinged to the lower end of the second top plate, the lower end of the third scissor plates is movably connected to the third base plate, and two fourth scissor plates that are spaced apart and connected together in the front-rear direction are movably connected to the lower end of the second top plate, the lower end of the fourth scissor plates is hinged to the second base plate, and the centers of the third scissor plates and the fourth scissor plates are hinged together.

5. The suture fiber friction measuring device as described in claim 4, characterized in that: The second top plate is fixedly connected to a second transmission component at one end in the left-right direction. A second lifting screw is rotatably connected to the second top plate on the second transmission component. A second moving block is threadedly connected to the second lifting screw and slidably connected to the lower side of the second top plate. Two fourth scissor plates are respectively hinged to the front and rear sides of the second moving block.

6. The suture fiber friction measuring device as described in claim 1, characterized in that: The test assembly also includes a clamping unit for clamping the fabric. The clamping unit includes a first upper connecting plate and a second upper connecting plate hinged to the upper slider. The lower ends of the first upper connecting plate and the second upper connecting plate are respectively hinged to a first lower connecting plate and a second lower connecting plate. The lower ends of the first lower connecting plate and the second lower connecting plate are hinged together and both are hinged to the lower slider. The first upper connecting plate, the first lower connecting plate, the second lower connecting plate and the second upper connecting plate are parallelograms.

7. The suture fiber friction measuring device as described in claim 6, characterized in that: Second clamps are fixedly connected to the first upper connecting plate, the second upper connecting plate, the first lower connecting plate, and the second lower connecting plate, and the four second clamps clamp the fabric.

8. The suture fiber friction measuring device as described in claim 1, characterized in that: The connecting frame has two columns fixedly connected at intervals in the front-back direction. A transmission screw is rotatably connected to the column. A first lifting block and a second lifting block are threadedly connected to the transmission screw. The upper and lower threads of the transmission screw are in opposite directions. The first lifting block and the second lifting block move synchronously towards each other or away from each other. The upper slider is fixedly connected to the two first lifting blocks, and the lower slider is fixedly connected to the two second lifting blocks.

9. The suture fiber friction measuring device as described in claim 8, characterized in that: A drive motor is fixedly connected to the upper side of the column, and the drive motor is connected to the corresponding drive screw.

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