Yarn and solid material friction measuring device and measuring method

Abstract

The invention discloses a yarn and solid material friction measuring device and method, and relates to the technical field of textile material performance tests.The measuring device comprises a rack, a tension adjusting mechanism, a yarn guiding mechanism, an input tension testing mechanism, a friction coefficient testing mechanism, an output tension testing mechanism and a winding mechanism, and the tension adjusting mechanism, the yarn guiding mechanism, the input tension testing mechanism, the friction coefficient testing mechanism, the output tension testing mechanism and the winding mechanism are fixed to the rack. The friction coefficient testing mechanism comprises a sliding rail and a sliding block which are connected, and a friction wheel detachably connected with the sliding block, and the friction wheel can be in contact friction with the yarn; wherein the sliding rail is located between the input tension testing mechanism and the output tension testing mechanism, the sliding rail is arranged in the extending direction of a vertical rod of the rack, and the friction wheel moves along the sliding rail to be used for adjusting the wrap angle theta between yarn and the friction wheel. The measuring device can meet the measuring requirements of various wrap angles, and the flexibility and universality of the measuring device are improved.

Description

Technical Field

[0001] This invention relates to the field of textile material performance testing technology, specifically to a device and method for measuring the friction between yarn and solid materials. Background Technology

[0002] The coefficient of friction of yarn is a key performance parameter for the textile processing and final product quality control: In the spinning, weaving, and knitting processes, yarn needs to come into frequent contact and rub against solid parts such as rollers, yarn guides, and knitting needles. Its coefficient of friction directly affects the smoothness of the processing (such as whether the yarn is prone to breakage or pilling), and also determines the strength, abrasion resistance, and wearing comfort of the final textile.

[0003] Currently, most measuring devices use a fixed friction pin structure, which can only measure the wrap angle at a fixed angle. They cannot flexibly adjust the wrap angle according to testing requirements and cannot simulate the complex contact state between yarn and solid components in actual processing. Therefore, current measuring devices cannot meet the measurement needs of various wrap angles, and their flexibility and versatility are low. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose a yarn-solid material friction measuring device and method, which solves the technical problems that the existing measuring devices cannot meet the measurement requirements of various wrap angles and have low flexibility and versatility.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a device for measuring the friction between yarn and solid materials, comprising a frame, a tension adjustment mechanism, a yarn guiding mechanism, an input tension testing mechanism, a friction coefficient testing mechanism, an output tension testing mechanism, and a winding mechanism; the frame includes multiple connected horizontal and vertical bars; the tension adjustment mechanism is fixed to the horizontal bars for adjusting the initial input tension of the yarn; the yarn guiding mechanism is fixed to the horizontal bars for guiding the yarn direction; the input tension testing mechanism is fixed to the horizontal bars and includes a first tension sensing wheel and a tension sensor, the first tension sensing wheel and the tension sensor being used to acquire the input tension of the yarn; friction The coefficient testing mechanism includes a connected slide rail and a slider, and a friction wheel detachably connected to the slider, which can contact and rub against the yarn. The output tension testing mechanism is fixed on the crossbar and includes a second tension sensing wheel and a tension sensor, which are used to acquire the output tension of the yarn. The winding mechanism is fixed on the crossbar and connected to the yarn, used to adjust the speed of the yarn's movement. The slide rail is located between the input tension testing mechanism and the output tension testing mechanism, and is arranged along the extension direction of the vertical bar. The friction wheel moves along the slide rail to adjust the wrap angle between the yarn and the friction wheel. .

[0006] In some embodiments, the friction coefficient testing mechanism further includes a drive motor connected to the slider for driving the friction wheel to move along the slide rail; the measuring device further includes a vision sensing mechanism fixed on the frame and signal-connected to the drive motor, the vision sensing mechanism being used to obtain the angle α between the yarn between the input tension testing mechanism and the friction wheel and between the yarn between the output tension testing mechanism and the friction wheel.

[0007] In some embodiments, the measuring device further includes a friction damage monitoring mechanism, which includes an inlet acquisition module and an outlet evaluation module. The inlet acquisition module is located between the input tension testing mechanism and the friction wheel, and is used to acquire the yarn hairiness before entering the friction wheel. The outlet evaluation module is located between the output tension testing mechanism and the friction wheel, and is used to acquire the yarn hairiness after leaving the friction wheel and perform damage evaluation.

[0008] In some embodiments, the yarn guiding mechanism includes a yarn guiding shaft and a yarn guiding wheel sleeved on the yarn guiding shaft. The outer circumferential surface of the yarn guiding wheel is provided with an annular yarn groove, which is used to define the position of the yarn and guide the direction of the yarn.

[0009] In some embodiments, the yarn guiding mechanism further includes a retaining ring, which is fixed to both sides of the yarn guiding wheel along the extension direction of the yarn guiding shaft.

[0010] In some embodiments, the input tension testing mechanism further includes a first guide wheel and a first output wheel. The first tension sensing wheel is located between the first guide wheel and the first output wheel along the yarn running direction, and the first tension sensing wheel, the first guide wheel, and the first output wheel are all coplanar with the yarn contact point. The output tension testing mechanism further includes a second guide wheel and a second output wheel. The second tension sensing wheel is located between the second guide wheel and the second output wheel along the yarn running direction, and the second tension sensing wheel, the second guide wheel, and the second output wheel are all coplanar with the yarn contact point.

[0011] In some embodiments, both the horizontal and vertical bars are aluminum profile frames, and the horizontal and vertical bars are connected by angle brackets.

[0012] In some embodiments, the crossbar is provided with multiple rubber pads, and the tension adjustment mechanism, the yarn guiding mechanism, and the winding mechanism are fixed to the crossbar by the rubber pads.

[0013] Secondly, the present invention also provides a method for measuring the friction between yarn and solid material, applicable to the aforementioned measuring device. The measuring method includes: adjusting the friction wheel to move along the slide rail, and obtaining the wrap angle between the friction wheel and the yarn after the friction wheel is fixed. Based on the corner of the envelope The input tension T1 and output tension T2 of the yarn are obtained respectively; based on the input tension T1 and output tension T2 of the yarn, the formula based on Amundon's law is applied. The friction coefficient μ is obtained.

[0014] In some embodiments, the measuring device further includes a friction damage monitoring mechanism, which includes an inlet acquisition module and an outlet evaluation module; the friction damage monitoring mechanism adjusts the movement of the friction wheel along the slide rail to obtain the wrap angle between the friction wheel and the yarn after the friction wheel is fixed. Subsequently, the measurement methods also include: based on the wrap angle. The yarn hairiness base number H1 before entering the friction wheel and the yarn hairiness base number H2 after leaving the friction wheel are obtained respectively. Based on the yarn hairiness base number H1 before entering the friction wheel and the yarn hairiness base number H2 after leaving the friction wheel, the hairiness increment ratio ΔH is calculated, and the degree of damage is determined based on the hairiness increment ratio ΔH.

[0015] Compared with existing technologies, the yarn-solid material friction measuring device provided by this invention improves the accuracy of friction measurement by coordinating multiple mechanisms, including a tension adjustment mechanism, a yarn guiding mechanism, an input tension testing mechanism, a friction coefficient testing mechanism, an output tension testing mechanism, and a winding mechanism. Furthermore, the friction coefficient testing mechanism employs a connected slide rail and slider structure, allowing for convenient and rapid adjustment of the wrap angle between the yarn and the friction wheel by utilizing the movement of the friction wheel along the slide rail. And the corner It has high adjustment accuracy, can meet the measurement needs of any angle, and improves the measurement accuracy of different wrap angles. The measurement is flexible, and the material of the friction wheel can be changed according to the test requirements, meeting the friction measurement needs of different materials and angles, effectively improving the versatility of the measuring device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the measuring device provided in an embodiment of the present invention; Figure 2 This is a front view of the measuring device (excluding the frame) provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure including a vision sensing mechanism and a friction wheel provided in an embodiment of the present invention; Figure 4 This is a top view of another measuring device (excluding the frame) provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the tension adjustment mechanism provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the yarn guiding mechanism provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the input tension testing mechanism, the friction coefficient testing mechanism, and the output tension testing mechanism provided in the embodiments of the present invention; Figure 8 This is a schematic diagram of the winding mechanism provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the friction damage monitoring mechanism and the friction coefficient testing mechanism provided in the embodiment of the present invention; Figure 10 This is a flowchart illustrating the measurement method provided in an embodiment of the present invention; Figure 11 This is a flowchart illustrating another measurement method provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 100. Measuring device; 200. Yarn; 110. Frame; 111. Horizontal bar; 112. Vertical bar; 113. Angle bracket; 120. Tension adjusting mechanism; 121. Tension adjusting wheel; 122. Yarn feeding wheel; 123. Bearing seat; 124. Yarn feeding shaft; 130. Yarn guiding mechanism; 131. Yarn guiding wheel; 1311. Annular yarn groove; 132. Yarn guiding shaft; 133. Limiting retaining ring; 140. Input tension testing mechanism; 141. First tension sensing wheel; 142. First guide wheel; 143. First guide wheel; 150. Friction coefficient testing mechanism; 151. Slide rail; 152. Slider; 153. Friction wheel; 154. Flange shaft; 160. Output tension testing mechanism; 161. Second tension sensing wheel; 162. Second guide wheel; 163. Second guide wheel; 170. Winding mechanism; 171. Stepper motor; 172. Coupling; 173. Winding reel; 174. Winding shaft; 175. Motor frame; 180. Friction damage monitoring mechanism; 181. Inlet acquisition module; 182. Outlet assessment module; 183. T-bolt; 190. Visual sensing mechanism. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] The coefficient of friction of yarn is a key performance parameter for the textile processing and final product quality control. For example, various yarn types, such as cotton, linen, silk, chemical fibers, glass fibers, and carbon fibers, all require friction measurement to fully understand their corresponding material performance parameters.

[0020] In some embodiments, a fixed friction pin structure is used, and the coefficient of friction is calculated by friction between the yarn and the fixed friction pin. However, the measuring angle of the fixed friction pin cannot be flexibly adjusted, requiring readjustment of the measuring device for different measuring angles, which is cumbersome.

[0021] To address the technical problem that measuring devices cannot meet the measurement requirements of various wrap angles and have low flexibility and versatility, this invention provides a yarn-solid material friction measuring device. By coordinating multiple mechanisms, including a tension adjustment mechanism, a yarn guiding mechanism, an input tension testing mechanism, a friction coefficient testing mechanism, an output tension testing mechanism, and a winding mechanism, the accuracy of friction measurement is improved. Furthermore, the friction coefficient testing mechanism employs a connected slide rail and slider structure, allowing for convenient and rapid adjustment of the wrap angle between the yarn and the friction wheel by utilizing the movement of the friction wheel along the slide rail. And the corner It has high adjustment accuracy, can meet the measurement needs of any angle, and improves the measurement accuracy of different wrap angles. The measurement is flexible, and the material of the friction wheel can be changed according to the test requirements, meeting the friction measurement needs of different materials and angles, effectively improving the versatility of the measuring device.

[0022] It should be noted that the friction measuring device of the present invention is used for, but not limited to, measuring yarn friction. For ease of explanation, this invention will only use the application of the friction measuring device to yarn friction measurement as an example. The principle of the friction measuring device applied to the friction measurement of other linear materials is essentially the same as that applied to yarn friction measurement, and will not be described in detail here.

[0023] This invention provides a device 100 for measuring the friction between yarn and solid materials, such as... Figures 1 to 9As shown, the friction measuring device 100 includes a frame 110, a tension adjusting mechanism 120, a yarn guiding mechanism 130, an input tension testing mechanism 140, a friction coefficient testing mechanism 150, an output tension testing mechanism 160, and a winding mechanism 170. The frame 110 includes multiple connected horizontal bars 111 and vertical bars 112. The tension adjusting mechanism 120 is fixed on the horizontal bars 111 and is used to adjust the initial input tension of the yarn 200. The yarn guiding mechanism 130 is fixed on the horizontal bars 111 and is used to guide the direction of the yarn 200. The input tension testing mechanism 140 is fixed on the horizontal bars 111 and includes a first tension sensing wheel 141 and a tension sensor. The first tension sensing wheel 141 and the tension sensor are used to acquire the input tension T1 of the yarn 200. The friction coefficient testing mechanism 150 includes multiple connected horizontal bars 111 and vertical bars 112. The system includes a slide rail 151, a slider 152, and a friction wheel 153 detachably connected to the slider 152. The friction wheel 153 is capable of contacting and rubbing against the yarn 200. The output tension testing mechanism 160 is fixed on the crossbar 111 and includes a second tension sensing wheel 161 and a tension sensor. The second tension sensing wheel 161 and the tension sensor are used to acquire the output tension T2 of the yarn. The winding mechanism 170 is fixed on the crossbar 111 and is connected to the yarn 200 to adjust the movement speed of the yarn 200. The slide rail 151 is located between the input tension testing mechanism 140 and the output tension testing mechanism 160. The slide rail 151 is arranged along the extension direction of the vertical bar 112, and the friction wheel 153 moves along the slide rail 151 to adjust the wrap angle θ between the yarn 200 and the friction wheel 153.

[0024] The frame 110 is a frame-type support structure for the measuring device 100, and each mechanism is detachably fixed to the horizontal bar 111 or vertical bar 112 of the frame 110. The yarn 200 passes through each mechanism sequentially along the preset yarn path.

[0025] In some embodiments, such as Figure 1 As shown, the horizontal bars 111 and vertical bars 112 of the frame 110 are both aluminum profile frames. The horizontal bars 111 and vertical bars 112, together with the corner brackets 113, form a modular support structure. The surfaces of the horizontal bars 111 and vertical bars 112 are provided with T-shaped grooves. The corner brackets are fixed in the T-shaped grooves by T-shaped nuts and bolts. Each mechanism is detachably connected to the horizontal bars 111 and vertical bars 112 through the corner brackets.

[0026] The aluminum profile frame is easy to assemble and disassemble, and the horizontal and vertical positions of each mechanism can be flexibly adjusted to meet the layout requirements of different spaces. At the same time, the overall support stability is good, which can reduce the impact of decreased measurement accuracy due to instability.

[0027] The tension adjustment mechanism 120 is used to adjust the initial input tension of the yarn 200. The tension adjustment mechanism 120 can be used to test the friction parameters of the yarn 200 under different tensions.

[0028] In some embodiments, such as Figure 5 As shown, the tension adjustment mechanism 120 includes a tension adjustment wheel 121, a yarn feeding wheel 122, a bearing seat 123, and a yarn feeding shaft 124. Both the yarn feeding wheel 122 and the tension adjustment wheel 121 are mounted on the yarn feeding shaft 124. The yarn feeding shaft 124 is supported at both ends by bearing seats with bearings. The bottom of the bearing seats with bearings is fixed to the T-groove of the crossbar 111 by bolts and T-nuts. The yarn feeding wheel 122 is fixed to one end of the yarn feeding shaft 124 by set bolts and is used to wind the yarn to be tested.

[0029] In some embodiments, the tension adjusting wheel 121 is a detachable structure, and its mass can be replaced according to testing requirements. By changing the input torque, the initial input tension of the yarn is adjusted, thereby testing the friction parameters of the yarn 200 under different tensions. On the one hand, it can meet the testing requirements of different yarns, such as cotton, linen, silk, chemical fiber, glass fiber, carbon fiber, and other yarns; on the other hand, it can meet the testing requirements of different tensions, with a tension adjustment range of 0-5000mN, specifically 100mN, 200mN, 500mN, 1000mN, 1500mN, 2000mN, 2500mN, 3000mN, 4000mN, 5000mN, or any value between any two adjacent values ​​mentioned above.

[0030] In some embodiments, a rubber pad is placed between the bearing housing and the crossbar 111. The rubber pad is used to absorb vibrations during the operation of the measuring device 100, avoid interference with tension measurement, and help improve the accuracy of the test.

[0031] The yarn guiding mechanism 130 is a structure used to guide the direction of the yarn 200. Any structure capable of guiding the direction of the yarn 200 meets the requirements of this application.

[0032] In some embodiments, such as Figure 6 As shown, the yarn guiding mechanism 130 includes a yarn guiding wheel 131 and a yarn guiding shaft 132. The yarn guiding wheel 131 is sleeved on the yarn guiding shaft 132, and the outer circumference of the yarn guiding wheel 131 is provided with an annular yarn groove 1311. The annular yarn groove 1311 is used to define the position of the yarn 200 and guide the direction of the yarn 200. The groove depth and groove width of the annular yarn groove 1311 are not limited, as long as they meet the requirements of matching the diameter of the yarn to be tested, for example, the groove depth is 1mm, 2mm, etc. The two ends of the yarn guiding shaft 132 are supported by bearing seats with bearings. The bottom of the bearing seats with bearings is fixed in the T-groove of the crossbar 111 by bolts and T-nuts. In order to achieve vibration reduction, a rubber pad is placed between the bearing seat and the crossbar 111.

[0033] In some embodiments, the yarn guiding mechanism 130 further includes a retaining ring 133, which is a component for restricting the movement of the yarn guiding wheel 131. The retaining ring 133 is fixed to both sides of the yarn guiding wheel 131 along the extending direction of the yarn guiding shaft 132, restricting the axial movement of the yarn guiding wheel 131 and ensuring that the yarn 200 always moves in the same plane. The material of the retaining ring 133 is not limited, for example, it is made of elastic polyurethane.

[0034] The input tension testing mechanism 140 is a component used to determine the input tension T1 before the yarn 200 undergoes friction measurement.

[0035] In some embodiments, the input tension testing mechanism 140 includes an L-shaped elongated hole bracket, a first tension sensing wheel 141, and a tension sensor. The first tension sensing wheel 141 and the tension sensor are rigidly connected. The tension sensor is electrically connected to the control unit via an RS-485 communication interface to transmit the collected input tension T1 data to the control unit in real time. One elongated hole on one side of the L-shaped elongated hole bracket is connected to the housing of the input tension testing mechanism 140, facilitating fine-tuning of the height of the input tension testing mechanism 140. The other elongated hole on the other side of the elongated hole bracket secures the input tension testing mechanism 140 to the crossbar 111 using bolts and T-nuts.

[0036] In some embodiments, such as Figure 7 As shown, the input tension testing mechanism 140 also includes a first guide wheel 142 and a first guide wheel 143. The first tension sensing wheel 141 is located between the first guide wheel 142 and the first guide wheel 143 along the running direction of the yarn 200. It can be understood that the first guide wheel 142 and the first guide wheel 143 are symmetrically distributed on both sides of the first tension sensing wheel 141. The yarn 200 sequentially passes over the upper side of the first guide wheel 142, the lower side of the first tension sensing wheel 141, and the upper side of the first guide wheel 143. The upper side of the first guide wheel 142, the lower side of the first tension sensing wheel 141, and the upper side of the first guide wheel 143 are coplanar with the contact point of the yarn 200, which helps stabilize the direction of the force exerted by the yarn 200 on the first tension sensing wheel 141 and improves measurement accuracy.

[0037] The output tension testing mechanism 160 is a component used to determine the output tension T2 after the yarn 200 undergoes friction measurement. It should be noted that the output tension testing mechanism 160 and the input tension testing mechanism 140 can have the same structure, differing only in their installation positions. The two mechanisms determine the tension of the yarn 200 before and after friction measurement, respectively.

[0038] In some embodiments, such as Figure 7As shown, the output tension testing mechanism 160 also includes a second guide wheel 162 and a second guide wheel 163. The second tension sensing wheel 161 is located between the second guide wheel 162 and the second guide wheel 163 along the running direction of the yarn 200. It can be understood that the second guide wheel 162 and the second guide wheel 163 are symmetrically distributed on both sides of the second tension sensing wheel 161. The yarn 200 sequentially passes over the upper side of the second guide wheel 162, the lower side of the second tension sensing wheel 161, and the upper side of the second guide wheel 163. The upper side of the second guide wheel 162, the lower side of the second tension sensing wheel 161, and the upper side of the second guide wheel 163 are coplanar with the contact points of the yarn 200, which helps stabilize the direction of the force exerted by the yarn 200 on the second tension sensing wheel 161 and improves measurement accuracy.

[0039] The friction coefficient testing mechanism 150 is a component used to measure the wrap angle θ and the friction coefficient by contacting and rubbing against the yarn 200. The friction coefficient testing mechanism 150 is located between the input tension testing mechanism 140 and the output tension testing mechanism 160.

[0040] In some embodiments, such as Figure 3 , Figure 7 and Figure 9 As shown, the friction coefficient testing mechanism 150 includes components such as a slide rail 151, a slider 152, a friction wheel 153, and a flange shaft 154. The slide rail 151 is arranged and fixed on the vertical rod 112 along the extension direction of the vertical rod 112. The slider 152 is provided with bolt holes. The bottom of the flange shaft 154 is fixed to the slider 152 by bolts. The friction wheel 153 is sleeved on the flange shaft 154. The movement of the friction wheel 153 on the flange shaft 154 in the vertical direction is realized by the slider 152.

[0041] It should be noted that when the positions of the input tension testing mechanism 140 and the output tension testing mechanism 160 remain fixed, the wrap angle θ can be adjusted by moving the friction wheel 153 along the slide rail 151. For example, if the friction wheel 153 moves downward along the slide rail 151, the wrap angle θ will gradually increase; if the friction wheel 153 moves upward along the slide rail 151, the wrap angle θ will gradually decrease.

[0042] For example, manual adjustment can be used. When the friction wheel 153 moves along the slide rail 151 to the wrap angle θ to be tested, the position of the slider 152 can be fixed by locking the handle to ensure that the wrap angle θ is stable for subsequent measurement.

[0043] For example, electric adjustment can be used, and relevant explanations will be given later, but will not be described in detail here.

[0044] In some embodiments, the friction wheel 153 is detachably connected to the flange shaft 154, and the friction wheel 153 can be replaced with different materials, such as steel, ceramic, plastic and other solid materials, according to the testing requirements.

[0045] The outer circumferential surface of the friction wheel 153 is provided with an annular yarn groove that matches the yarn guide wheel 131.

[0046] The take-up mechanism 170 provides power for the movement of the yarn 200 and is used to regulate the speed of the yarn 200. The take-up mechanism 170 is electrically connected to the control unit. The control unit sets the motor speed to achieve precise control of the speed of the yarn 200, meeting the speed requirements of different testing standards.

[0047] In some embodiments, such as Figure 8 As shown, the winding mechanism 170 includes components such as a stepper motor 171, a coupling 172, a winding wheel 173, a winding shaft 174, and a motor frame 175. The motor frame 175 is fixed to the end of the crossbar 111 by bolts. The stepper motor 171 is fixed to the motor frame 175, and the output shaft of the stepper motor 171 is connected to the winding shaft 174 through the coupling 172. The winding wheel 173 is sleeved on the winding shaft 174, which is supported by a bearing seat with bearings. A rubber gasket is placed between the bearing seat and the motor frame 175.

[0048] To better understand the relative arrangement of the various mechanisms, the movement path of the yarn 200 to be tested is explained below.

[0049] The yarn feeding wheel 122 of the tension adjustment mechanism 120 → the yarn guiding wheel 131 of the yarn guiding mechanism 130 → the first inlet wheel 142 of the input tension testing mechanism 140 → the first tension sensing wheel 141 of the input tension testing mechanism 140 → the first outlet wheel 143 of the input tension testing mechanism 140 → the friction wheel 153 of the friction coefficient testing mechanism 150 → the second inlet wheel 162 of the output tension testing mechanism 160 → the second tension sensing wheel 161 of the output tension testing mechanism 160 → the second outlet wheel 163 of the output tension testing mechanism 160 → the winding wheel 173 of the winding mechanism 170.

[0050] The friction measuring device 100 also includes a control unit, which is an automated control unit (not shown in the figure). The control unit includes a computer terminal and a data acquisition module. By acquiring the input tension T1, the output tension T2, and the wrap angle θ, the computer terminal can derive the relationship between the friction coefficient and the wrap angle θ. For ease of understanding, the operation process is explained below.

[0051] 1. Parameter settings: Set the stepper motor speed, test duration, and wrap angle θ; 2. Real-time acquisition: Receives the input tension T1 before friction measurement and the output tension T2 after friction measurement. The sampling frequency can be determined according to the actual situation, for example, a sampling frequency of 10Hz.

[0052] 3. Automatic calculation: based on Amundon's Law formula Derivation of the coefficient of friction Calculate T1, T2 and The average value, where, T1 is the coefficient of kinetic friction (dimensionless), T2 is the input tension (unit: mN), and T2 is the output tension (unit: mN). The wrap angle (unit: radians).

[0053] It should be noted that, considering the possibility of data errors, to improve the accuracy of the calculation, the 3σ criterion was used to remove outlier data with fluctuations exceeding ±5%, thus obtaining the averaged T1 and T2, which were then used to calculate the friction coefficient. .

[0054] 4. Data Storage and Export: Store test data (including time, T1, T2, ...). (θ, rotational speed), and export parameter reports for analysis.

[0055] By coordinating multiple mechanisms such as the tension adjustment mechanism 120, the yarn guiding mechanism 130, the input tension testing mechanism 140, the friction coefficient testing mechanism 150, the output tension testing mechanism 160, and the take-up mechanism 170, the accuracy of friction measurement can be improved. Meanwhile, the friction coefficient testing mechanism 150 adopts a structure with connected slide rail 151 and slider 152. By utilizing the movement of the friction wheel 153 along the slide rail 151, the wrap angle between the yarn and the friction wheel 153 can be conveniently and quickly changed. And the corner It has high adjustment accuracy, can meet the measurement needs of any angle, and improves the measurement accuracy of different wrap angles. The measurement is flexible, and the material of the friction wheel 153 can be changed according to the test requirements to meet the friction measurement of different materials and different angles, effectively improving the versatility of the measuring device 100.

[0056] In some embodiments, such as Figure 3 and Figure 4 As shown, the friction coefficient testing mechanism also includes a drive motor, which is connected to the slider 152 and is used to drive the friction wheel 153 to move along the slide rail 151; the measuring device 100 also includes a vision sensing mechanism 190, which is fixed on the frame 110 and connected to the drive motor. The vision sensing mechanism 190 is used to obtain the angle α between the yarn 200 between the input tension testing mechanism 140 and the friction wheel 153 and the yarn 200 between the output tension testing mechanism 160 and the friction wheel 153.

[0057] Considering the flexibility of multi-angle measurement, electric adjustment can be used. By connecting the drive motor to the slider 152, the drive motor drives the slider 152 to move, thereby driving the friction wheel 153 to move along the slide rail 151.

[0058] The linkage method between the drive motor and the slider 152 is not limited. For example, a gear and rack transmission method can be used, where the drive motor rotates the gear, which meshes with a rack fixed beside the slide rail. The rotational motion of the gear is directly converted into linear motion of the slider along the slide rail. Alternatively, a ball screw transmission method can be used, where the drive motor is directly connected to the ball screw via a coupling. The rotation of the drive motor drives the ball screw to rotate. The nut on the ball screw is fixed to the slider, and the rotation of the ball screw drives the nut and the slider to move linearly along the slide rail.

[0059] The measuring device 100 is also provided with a visual sensing mechanism 190, which is fixed on the frame 110 and is a component used to obtain the included angle α.

[0060] The specific type of the visual sensing mechanism 190 is not limited. For example, the visual sensing mechanism 190 is a visual angle measuring instrument equipped with a high-pixel resolution detector and a wide-angle conical lens. Through a single image captured by the conical lens, relevant spectral parameters from multiple angles can be obtained. Then, professional analysis software processes and analyzes the image to calculate the included angle α. For example, the visual sensing mechanism 190 includes an industrial camera combined with visual algorithms. The industrial camera captures a target area containing the included angle α, the software preprocesses the image (denoising, edge extraction), and then uses algorithms such as line fitting and vector calculation to calculate the included angle α.

[0061] It should be noted that the included angle α + the wrap angle θ = 180°. Therefore, the wrap angle θ can be obtained by obtaining the included angle α through the vision sensing mechanism 190. The vision sensing mechanism 190 works in conjunction with the drive motor through the control unit. The drive motor drives the friction wheel 153 to move along the slide rail 151. The vision sensing mechanism 190 provides real-time feedback of the included angle α. When the friction wheel 153 moves to the preset included angle α, which is the wrap angle θ to be measured, the drive motor stops running to ensure that the wrap angle θ is stable for subsequent measurement.

[0062] In some embodiments, the included angle α can also be determined by a coordinate system. The positions of the input tension testing mechanism 140 and the output tension testing mechanism 160 on the frame 110 remain unchanged, and their coordinates relative to the frame 110 remain unchanged. By obtaining the coordinates of the friction wheel 153, the included angle α between the yarn 200 between the input tension testing mechanism 140 and the friction wheel 153 and the yarn 200 between the output tension testing mechanism 160 and the friction wheel 153 can be calculated using the coordinates. Obtaining the included angle α is equivalent to obtaining the wrap angle θ.

[0063] In some embodiments, the measuring device 100 further includes a friction damage monitoring mechanism 180, which includes an inlet acquisition module 181 and an outlet evaluation module 182. The inlet acquisition module 181 is located between the input tension testing mechanism 140 and the friction wheel 153, and is used to acquire the hairiness of the yarn 200 before entering the friction wheel 153. The outlet evaluation module 182 is located between the output tension testing mechanism 160 and the friction wheel 153, and is used to acquire the hairiness of the yarn 200 after leaving the friction wheel 153 and to perform damage evaluation.

[0064] The inlet acquisition module 181 includes an industrial camera for acquisition, a coaxial LED light source, a long-hole angle bracket, and other components.

[0065] The inlet acquisition module 181 is mounted on the frame 110 between the input tension testing mechanism 140 and the friction wheel 153 via T-bolts 183. The height of the industrial camera is adjusted by the elongated angle bracket to ensure that the lens is vertically aligned with the center of the yarn 200, capturing the number of hairs H1 of the yarn 200 before friction. H1 is the number of hairs per millimeter of yarn length.

[0066] The export assessment module 182 includes components such as an industrial camera and a synchronous trigger sensor (friction wheel shaft encoder). The pulse signal output by the friction wheel shaft encoder triggers synchronous exposure of the dual cameras, with an exposure interval of 10ms, to ensure that the acquisition timing is synchronized with the yarn friction process.

[0067] The export assessment module 182 is mounted on the frame 110 between the output tension testing mechanism 160 and the friction wheel 153 via T-bolts 183. An industrial camera captures the hairiness base number H2 of the yarn 200 after friction and calculates the hairiness increment ratio. .

[0068] By employing simultaneous monitoring of the inlet acquisition module 181 and the outlet evaluation module 182, the changes in yarn hairiness before and after friction are dynamically quantified, and a correlation model between the friction coefficient and yarn damage is established, providing complete data support for the optimization of textile processing technology (such as roller material selection and spinning speed setting).

[0069] Furthermore, the entire measuring device 100 can automatically acquire tension data and hair data, automatically calculate the friction coefficient and hair increment, and store and export data reports without manual intervention, which helps to improve measurement efficiency.

[0070] To better understand this invention, the following example of measuring the friction coefficient and monitoring the damage between glass fiber yarn and a steel friction wheel will be used to describe the assembly and operation of the measuring device 100 in detail: I. Rack Assembly The frame 110 uses an aluminum profile frame and corner brackets, fixed with T-nuts, to construct a test bench with a length of 1500mm, a width of 500mm, and a height of 800mm. The frame 110 includes a first end and a second end along its length; for ease of description, the first end is referred to as the left side, and the second end as the right side.

[0071] II. Mechanism Installation The tension adjustment mechanism 120 uses a tension adjustment wheel 121 with a mass of 100g, which is fixed to the first end of the frame 110 through a bearing seat with a bearing. A 2mm thick rubber pad is placed between the bearing seat and the aluminum profile frame.

[0072] The yarn guiding mechanism 130 is fixed 100mm to the right of the tension adjusting mechanism 120; the annular yarn groove 1311 on the yarn guiding wheel 131 is 0.3mm wide to accommodate glass fiber yarn, the glass fiber yarn is 0.25mm in diameter, and the limiting ring 133 is made of elastic polyurethane material.

[0073] Input tension testing mechanism 140, fixed 80mm to the right of yarn guiding mechanism 130; adjust the height of long hole corner code to 800mm to ensure that the first tension sensing wheel 141, first guide wheel 142 and first guide wheel 143 are coplanar with the contact point of yarn 200.

[0074] The inlet acquisition module 181 is installed between the input tension testing mechanism 140 and the friction wheel 153. The elongated angle code is adjusted so that the camera lens is vertically aligned with the center of the yarn, and the field of view covers the area before the yarn friction.

[0075] The friction coefficient testing mechanism 150 has a 50mm diameter steel friction wheel mounted on the flange shaft 154. The slide rail 151 is fixed 100mm to the right of the input tension testing mechanism 140. A protractor with an accuracy of 0.5° is installed, or the angle is measured using a vision sensing mechanism 190.

[0076] The export evaluation module 182 is installed between the output tension testing mechanism 160 and the friction wheel 153. The elongated angle code is adjusted so that the camera lens is vertically aligned with the center of the yarn, and the field of view covers the area after the yarn is rubbed.

[0077] The output tension testing mechanism 160 is fixed 100mm to the right of the friction coefficient testing mechanism 150.

[0078] The take-up mechanism 170 is fixed to the right end of the frame 110, i.e., the second end, and the winding wheel has a diameter of 80mm.

[0079] III. Control Unit Connection The tension sensor and data acquisition module are connected via a data cable, and the data acquisition module is connected to a computer terminal via an interface; dual cameras are connected to the computer terminal, and the friction wheel shaft encoder is electrically connected to the data acquisition module to achieve synchronous triggering of the cameras; dedicated testing software is installed on the computer terminal.

[0080] IV. Parameter Settings In the testing software, the stepper motor speed is set to 5 m / min and the test duration is 5 min; the drive motor adjusts slider 152 so that the wrap angle θ between yarn 200 and steel friction wheel 153 is 90° (π / 2), and the θ value is input into the software; the camera exposure interval is set to 10 ms, and the statistical unit of hair count is "the number of hairs per millimeter of yarn length".

[0081] V. Testing Process 1. Yarn path: Yarn release wheel 122 → Yarn guide wheel 131 → First guide wheel 142 → First tension sensing wheel 141 → First exit wheel 143 → Inlet acquisition module monitoring point → Friction wheel 153 → Outlet evaluation module monitoring point → Second guide wheel 162 → Second tension sensing wheel 161 → Second exit wheel 163 → Yarn winding wheel 173.

[0082] 2. Focus the acquisition module and adjust the long-aperture angle bracket to make the lens perpendicular to the center of the yarn, ensuring that the field of view covers the friction contact area.

[0083] 3. Tension pre-adjustment: Rotate the tension adjustment wheel 121 and observe the real-time data of the input tension T1 through the software to stabilize the input tension T1 at 1200mN.

[0084] 4. Start the test. Click the "Start Test" button in the software. Stepper motor 171 starts, and yarn winding wheel 173 drives yarn 200 to move at a constant speed of 5m / min. At the same time, the friction wheel shaft encoder outputs a pulse signal, triggering the dual cameras to synchronously acquire one frame of image every 10ms. The software collects input tension T1 and output tension T2 data in real time (sampling frequency 10Hz) and displays the tension dynamic curve.

[0085] 5. Data processing: During the test, the software automatically removes abnormal data with fluctuations exceeding ±5%. After the test, the average value of T1 and the average value of T2 are calculated.

[0086] 6. Calculation of friction coefficient, according to the formula Calculate the coefficient of friction Friction damage calculation, hair increment ratio .

[0087] 7. Data export: The software automatically stores test data (including time, T1, T2, μ, θ, rotational speed, H1, H2, ΔH) and feather images, and exports reports.

[0088] This application also provides a method 300 for measuring friction between yarn and solid material, such as... Figure 10 As shown, the measurement method 300 includes: Step S310: Adjust the friction wheel to move along the slide rail to obtain the wrap angle between the friction wheel and the yarn after the friction wheel is fixed. .

[0089] Specifically, measure the wrap angle as needed. Adjust the friction wheel to adjust the wrap angle between the friction wheel and the yarn after it is fixed. Meets measurement requirements.

[0090] Step S320, based on the wrap angle The input tension T1 and output tension T2 of the yarn are obtained respectively.

[0091] Specifically, the input tension T1 before friction measurement and the output tension T2 after friction measurement are collected. Considering the accuracy requirements, the 3σ criterion is used to remove abnormal data with fluctuations exceeding ±5%, and the averaged input tension T1 and output tension T2 are obtained.

[0092] Step S330: Based on the yarn input tension T1 and the yarn output tension T2, and using Amunden's Law formula... The friction coefficient μ is obtained.

[0093] Specifically, in obtaining the corner After inputting the tension T1 and outputting the tension T2, the friction coefficient μ is calculated using Amunden's law formula.

[0094] In some embodiments, the measuring device further includes a friction damage monitoring mechanism, which includes an inlet acquisition module and an outlet evaluation module.

[0095] In step S310, the friction wheel is adjusted to move along the slide rail to obtain the wrap angle between the friction wheel and the yarn after the friction wheel is fixed. After that, as Figure 11 As shown, the measurement method 300 also includes: Step S340, based on the wrap angle The yarn hairiness base number H1 before entering the friction wheel and the yarn hairiness base number H2 after leaving the friction wheel are obtained respectively.

[0096] Specifically, when acquiring the input tension T1 and output tension T2 of the yarn, the inlet acquisition module and the outlet evaluation module can simultaneously acquire the yarn hairiness base number H1 before entering the friction wheel and the yarn hairiness base number H2 after leaving the friction wheel.

[0097] Step S350: Calculate the hairiness increment ratio ΔH based on the hairiness base number H1 of the yarn before entering the friction wheel and the hairiness base number H2 of the yarn after leaving the friction wheel, and determine the degree of damage based on the hairiness increment ratio ΔH.

[0098] Specifically, in obtaining the corner The hairiness base number H1 of the yarn before the friction wheel and the hairiness base number H2 of the yarn after leaving the friction wheel are used to obtain the hairiness increment ratio. For example, if ΔH exceeds a preset threshold, the yarn damage can be considered severe; if ΔH does not exceed the preset threshold, the yarn damage can be considered minor. The specific preset threshold can be determined as needed, such as 1%, 2%, 5%, etc. Therefore, the invented measuring device can simultaneously measure the coefficient of friction and friction damage, which helps in investigating the wrap angle. friction coefficient μ and friction damage The relationship between them.

[0099] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A device for measuring friction between yarn and solid material, characterized in that, include: The frame consists of multiple connected horizontal and vertical bars; A tension adjustment mechanism, fixed to the crossbar, is used to adjust the initial input tension of the yarn; A yarn guiding mechanism, fixed on the crossbar, is used to guide the direction of the yarn; An input tension testing mechanism, fixed on the crossbar, includes a first tension sensing wheel and a tension sensor, which are used to acquire the input tension of the yarn. A friction coefficient testing mechanism includes a connected slide rail and a slider, and a friction wheel detachably connected to the slider, the friction wheel being able to contact and rub against the yarn; An output tension testing mechanism, fixed on the crossbar, includes a second tension sensing wheel and a tension sensor, which are used to acquire the output tension of the yarn; A winding mechanism, fixed to the crossbar, is connected to the yarn and used to adjust the speed of the yarn's movement; The slide rail is located between the input tension testing mechanism and the output tension testing mechanism, and is arranged along the extension direction of the vertical rod. The friction wheel moves along the slide rail to adjust the wrap angle between the yarn and the friction wheel. .

2. The measuring device according to claim 1, characterized in that, The friction coefficient testing mechanism also includes a drive motor, which is connected to the slider and is used to drive the friction wheel to move along the slide rail; The measuring device further includes a visual sensing mechanism, which is fixed on the frame and signal-connected to the drive motor. The visual sensing mechanism is used to obtain the angle α between the yarn between the input tension testing mechanism and the friction wheel and the yarn between the output tension testing mechanism and the friction wheel.

3. The measuring device according to claim 1 or 2, characterized in that, The measuring device further includes a friction damage monitoring mechanism, which comprises: An inlet acquisition module is located between the input tension testing mechanism and the friction wheel. The inlet acquisition module is used to acquire the hairiness of the yarn before it enters the friction wheel. An exit evaluation module is located between the output tension testing mechanism and the friction wheel. The exit evaluation module is used to collect the hairiness of the yarn after it leaves the friction wheel and to evaluate the damage.

4. The measuring device according to claim 1, characterized in that, The yarn guiding mechanism includes a yarn guiding shaft and a yarn guiding wheel sleeved on the yarn guiding shaft. The outer circumferential surface of the yarn guiding wheel is provided with an annular yarn groove, which is used to define the position of the yarn and guide the direction of the yarn.

5. The measuring device according to claim 4, characterized in that, The yarn guiding mechanism also includes a limiting retaining ring, which is fixed to both sides of the yarn guiding wheel along the extension direction of the yarn guiding shaft.

6. The measuring device according to claim 1, characterized in that, The input tension testing mechanism further includes a first guide wheel and a first guide wheel. The first tension sensing wheel is located between the first guide wheel and the first guide wheel along the yarn running direction, and the first tension sensing wheel, the first guide wheel, and the first guide wheel are coplanar with the yarn contact point. The output tension testing mechanism further includes a second inlet wheel and a second outlet wheel. The second tension sensing wheel is located between the second inlet wheel and the second outlet wheel along the yarn running direction, and the second tension sensing wheel, the second inlet wheel, and the second outlet wheel are all coplanar with the yarn contact point.

7. The measuring device according to claim 1, characterized in that, Both the horizontal and vertical bars are made of aluminum profile frames, and the horizontal and vertical bars are connected by angle brackets.

8. The measuring device according to claim 1, characterized in that, The crossbar is provided with multiple rubber pads, and the tension adjustment mechanism, the yarn guiding mechanism and the winding mechanism are fixed to the crossbar through the rubber pads.

9. A method for measuring friction between yarn and solid material, applicable to the measuring device described in any one of claims 1-8, characterized in that, The measurement method includes: Adjust the friction wheel to move along the slide rail to obtain the wrap angle between the friction wheel and the yarn after the friction wheel is fixed. ; Based on the wrap angle The input tension T1 and the output tension T2 of the yarn are obtained respectively. Based on the input tension T1 and output tension T2 of the yarn, and using the Ammonton's Law formula... The friction coefficient μ is obtained.

10. The measurement method according to claim 9, wherein the measuring device further comprises a friction damage monitoring mechanism, the friction damage monitoring mechanism comprising an inlet acquisition module and an outlet evaluation module; The friction wheel is adjusted to move along the slide rail to obtain the wrap angle between the friction wheel and the yarn after the friction wheel is fixed. Subsequently, the measurement method further includes: Based on the wrap angle The yarn hairiness base number H1 before entering the friction wheel and the yarn hairiness base number H2 after leaving the friction wheel are obtained respectively. The hairiness increment ratio ΔH is calculated based on the hairiness base number H1 of the yarn before entering the friction wheel and the hairiness base number H2 of the yarn after leaving the friction wheel, and the degree of damage is determined based on the hairiness increment ratio ΔH.

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