Impregnated yarn sample preparation device and sample preparation method thereof

Abstract

The invention discloses an impregnated yarn sample preparation device and a sample preparation method thereof, and belongs to the technical field of impregnated yarn sample preparation equipment.The impregnated yarn sample preparation device comprises a rack, and a yarn unwinding mechanism and a winding mechanism are arranged on the rack; a twist control structure, a tension measuring module, a resin infiltration module and a forming module which are fixed to the top of the rack are sequentially arranged between the yarn unwinding mechanism and the winding mechanism. Real tension control and measurement, twist control, impregnation efficiency improvement and section measurement and control in the impregnated yarn sample preparation process are achieved, the controllability and preparation efficiency of the technological process are remarkably improved, and the problems that in the prior art, the sample preparation technology is weak in adjustment capacity and low in preparation efficiency are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of dipped yarn sample making equipment, and in particular relates to a dipped yarn sample making device and a sample making method thereof. Background Art

[0002] Textile composite materials are composite materials that use textile technology to make fiber yarns into the required pre-woven parts according to a certain spatial distribution, and then use the corresponding process to infiltrate and solidify with resin. Thanks to the fiber yarns interweaving in space to form a mesh structure, textile composite materials have better out-of-plane performance, impact resistance and high damage tolerance.

[0003] Since the microstructure of the formed textile composite material is mainly composed of dipped yarn and pure matrix, and the external load is mainly borne by the dipped yarn. Therefore, the mechanical property parameters of the dipped yarn are the basic data for the impact resistance design of the textile composite structure, and a large number of mechanical tests such as tension and compression are required. In addition, the mechanical properties of the dipped yarn can intuitively reflect the performance of the fiber yarn and the performance of the material after the fiber-matrix composite. Therefore, the mechanical property test based on the dipped yarn is a commonly used method for fiber process evaluation and composite material selection.

[0004] The main steps of dipped yarn sample preparation can be divided into four stages: yarn laying, resin impregnation, fixation, and curing, and finally forming a slender cylindrical composite material. Many studies have shown that the process control and stability in the above sample preparation will seriously affect the mechanical properties test results of dipped yarn, such as fiber damage, fiber deflection, resin enrichment, unstable cross-sectional shape, surface and internal porosity, twist, etc.

[0005] However, the current industry's corresponding specifications and standards, such as "GB / T 26749-2022 Determination of tensile properties of carbon fiber dipped yarn" and "GB / T 3362-2017 Test method for tensile properties of carbon fiber multifilament", roughly divide dipped yarn sample preparation into machine method and manual method, but both lack specific process quantitative control methods. In fact, there is still no unified standard for the preparation process of dipped yarn. The quality control and effectiveness judgment in sample preparation rely heavily on personal experience and the knowledge accumulation of various units. There is a lack of clear and unified quantitative control and stable sample preparation methods for process parameters such as yarn tension, resin content, cross-sectional shape, porosity, twist, etc. This problem has greatly reduced the effectiveness and credibility of the mechanical test results, requiring a lot of repetitive work in the sample preparation process, and the sample preparation efficiency is extremely low and consumes a lot of manpower and material resources.

[0006] In the prior art, for example, a Chinese invention patent with application publication number CN110938953A discloses a quantitative control device and a sample preparation method for reinforcing fiber dipped yarn. The method realizes tension control through the combined effect of a tension controller, a driving device, a magnetic powder clutch, a magnetic powder brake, a dipped yarn winding frame and a raw yarn support roller. However, the method has the disadvantages that the tension cannot be measured and displayed in real time and the tension control is unstable. As is well known, the tension controller can only control the torque of the magnetic powder brake, and the specific real-time tension inside the yarn cannot be measured by this technical solution. In addition, the connection relationship between the tension yarn drum and the raw yarn support roller is not clear. When the yarn drum and the raw yarn support roller rotate relative to each other, the real-time tension inside the yarn will suddenly decrease and it is difficult to maintain stability. The technical solution also realizes rough control of resin viscosity and content through the oil bath heating of the resin tank and the rectangular channel composed of fixed rods. However, in this solution, the rectangular channel can only qualitatively filter out excess resin, but cannot quantitatively determine the specific amount of excess resin, and the shape of the dipped yarn after extrusion through the rectangular channel is difficult to maintain a stable circular cross-section, and the measurement and control of the cross-sectional size cannot be achieved.

[0007] The Chinese invention patent with application publication number CN113789623A discloses a one-step method for making dipped yarn. The device qualitatively realizes tension control and measurement through constant tension unwinding and a single pulley tension sensor. However, this method actually measures the pressure of the yarn on the sensor in the vertical fiber direction, rather than the real tension in the yarn axis. In addition, this method uses a coating wheel to impregnate the yarn with resin, which is an indirect impregnation method, and the impregnation quality and efficiency of the yarn cannot be guaranteed.

[0008] The Chinese invention patent with application publication number CN116625794A discloses a method for preparing a sample to reduce the defects of carbon fiber multifilament mechanical samples. This method realizes the control of the resin content and cross-section of the dipped yarn through a mold, and can apply tension, but cannot quantitatively control the tension. In addition, under this method, the length of the dipped yarn that can be prepared at a time is limited by the viscosity and wettability of the resin. Multiple molds are required for large-scale preparation, and the preparation efficiency is low.

[0009] In general, the above disclosed technical solutions and devices cannot simultaneously meet the requirements of measuring and controlling the real tension of the yarn, high-efficiency impregnation, and measuring and controlling the cross-sectional dimensions in the process of preparing dipped yarn samples. The above parameters have a direct impact on the quality and efficiency of dipped yarn samples. In addition, in the preparation of dipped yarn, the control of twist is very critical, and the above methods cannot adjust the degree of twisting of the yarn. The twist of the yarn will significantly affect its mechanical properties such as strength and modulus. It is an important geometric parameter of the yarn and must be controlled in the process of preparing dipped yarn samples.

[0010] In summary, the existing dipped yarn sample preparation device and process have many difficult-to-control factors in the sample preparation process, which seriously affect the mechanical properties and quality stability of the dipped yarn. Therefore, developing a dipped yarn sample preparation device and sample preparation method that can accurately control these key parameters is of great significance to improving the preparation efficiency and quality of the dipped yarn. Summary of the invention

[0011] The present invention aims to provide a dipped yarn sampling device and a sampling method thereof, so as to realize the control and real-time measurement of the real tension inside the dipped yarn during the sampling process, the high-efficiency impregnation of the dipped yarn, the cross-sectional size control and measurement, and the twist control of the dipped yarn, so as to solve the prior art defects described in the technical background.

[0012] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0013] Provided is a dipped yarn sample making device, which comprises a stand, on which a yarn unwinding mechanism and a winding mechanism are arranged, and between which a twist control structure fixed to the top of the stand, a tension measuring module, a resin impregnation module and a molding module are arranged in sequence;

[0014] The yarn releasing mechanism is used to fix the yarn bobbin wound with the yarn and to release the yarn on the yarn bobbin at a controllable constant torque;

[0015] The twist control structure comprises a bottom plate fixedly connected to the upper end surface of the stand, the bottom plate is provided with a through hole for the yarn to pass through, a rotating twisting wheel is provided on the end surface of the bottom plate, and a yarn clamping wheel is provided on one side of the twisting wheel;

[0016] The tension measuring module comprises a wheel seat fixedly connected to the upper end surface of the stand, and at least one tension yarn guide wheel is arranged on the wheel seat, and a tension sensor is connected to one of the tension yarn guide wheels;

[0017] The resin impregnation module comprises a resin tank and at least one resin impregnation yarn guide wheel arranged in the resin tank, the resin tank is filled with resin liquid, and the resin impregnation yarn guide wheel is partially immersed in the liquid surface of the resin liquid;

[0018] The forming module includes an extrusion wheel pair, a pultrusion die and a laser diameter measuring module which are arranged in sequence;

[0019] The winding mechanism comprises a rotating winding shaft, on which a yarn winding frame is arranged, and the winding shaft drives the yarn winding frame to rotate and pulls the yarn at a controllable speed for yarn winding.

[0020] The dipped yarn sampling device in the present invention is composed of a yarn unwinding mechanism, a twist control mechanism, a tension measuring module, a resin impregnation module, a molding module, a winding mechanism and a stand, which realizes real tension control and measurement, twist control, impregnation efficiency improvement, and cross-section measurement and control in the dipped yarn sampling process. Effective control and adjustment are achieved for the four important process parameters in the preparation of the above-mentioned dipped yarn, solving the problems of weak process adjustment ability and low preparation efficiency in the prior art sampling.

[0021] Furthermore, as a specific setting method of the yarn unwinding mechanism, the yarn unwinding mechanism includes a mounting plate whose bottom is fixedly connected to the upper end surface of the stand, a magnetic powder brake and a controller electrically connected thereto are arranged on the mounting plate, the rotating shaft of the magnetic powder brake is connected to the barrel shaft through a coupling, and a fixed top cone and a movable top cone for fixing the yarn barrel are arranged at intervals on the barrel shaft.

[0022] Specifically, the principle and function of the yarn unwinding mechanism are as follows: the magnetic powder brake is electrically connected to the tension controller, and the tension controller controls the magnetic powder brake to generate a constant torque. The fixed top cone and the movable top cone are respectively placed on both sides of the yarn tube and fastened to the surface of the tube shaft, jointly limiting the relative rotation of the yarn tube and the tube shaft. The fixed top cone and the movable top cone are both truncated cones with serrated protrusions embedded along the circumference to clamp the inner wall of the yarn tube. The beneficial effect of the yarn unwinding mechanism is that when the yarn is pulled by the winding mechanism, the constant torque generated by the magnetic powder brake is balanced with the tension on the yarn, and the unwinding mechanism allows the yarn wound on the yarn tube to be unwound with a controllable constant torque.

[0023] Further, as a specific setting mode of the twist control structure, the twist control structure includes three limit wheels rotatably arranged on the end surface of the bottom plate, the three limit wheels are arranged in a triangle, one of the limit wheels is connected to a driver, and the driver drives the limit wheel to rotate around its own axis; through holes are arranged inside the three limit wheels;

[0024] The torsion pair of wheels includes a circular frame arranged inside the three limiting wheels, the circumferential outer walls of the circular frame are respectively in contact with or meshing with the outer contour surfaces of the three limiting wheels, two first extrusion wheels are rotatably arranged inside the circular frame, and a tension spring is arranged between the two first extrusion wheels for applying a pulling force to the two first extrusion wheels to make the two wheels move toward each other.

[0025] The principle and function of the twist control structure are as follows: the driver drives the limiting wheel to rotate, thereby driving the circular frame in contact with the three limiting wheels and the two first extrusion wheels inside the circular frame to rotate. The distance between the yarn clamping wheel and the twisting wheel, the speed of the driver and the rotation direction can be adjusted according to the twisting demand, realizing the real-time twisting or untwisting process during the continuous preparation of the dipped yarn sampling device, without the need to pre-twist or untwist the yarn on the yarn tube in advance, which significantly improves the controllability and preparation efficiency of the process.

[0026] Furthermore, as a specific implementation of the tension measurement module, three tension yarn guide wheels arranged in an isosceles triangle structure are provided on the wheel seat, each tension yarn guide wheel is provided with a wheel axle and each wheel axle is fixedly connected to the wheel seat through a circular hole or a waist hole, and the shaft of the tension sensor is connected to the wheel axle of the tension yarn guide wheel located at the top of the triangle.

[0027] The principle and function of the tension measurement module are as follows: the wheel seat is provided with a plurality of circular holes or waist holes, so as to realize the angle adjustment of the isosceles triangle formed by the centers of the three wheel axles. Furthermore, after the yarn passes through the three tension yarn guide wheels, pressure is generated on the tension sensor in the middle. According to the angle of the isosceles triangle formed by the yarn, the real yarn tension can be converted. The tension sensor should have the functions of real-time display and real-time recording. The beneficial effect produced by the tension measurement module is as follows: by adjusting the position of the yarn guide wheel, the passing yarn forms an adjustable deflection angle, and the real yarn internal tension can be obtained and recorded according to the specific angle and mechanical decomposition.

[0028] Furthermore, the resin impregnation module also includes a mounting base fixedly connected to the upper surface of the stand, and two "L"-shaped axles are horizontally spaced apart on the mounting base, and each axle is provided with a resin impregnation guide wheel; the resin tank is located below the mounting base, and the resin tank is integrated with a heating module and an ultrasonic vibration module.

[0029] The principle and function of the resin impregnation module are as follows: the L-shaped wheel axle is higher than the resin liquid level in the resin tank, but the impregnation yarn guide wheel is partially submerged below the resin liquid level to ensure that the passing yarn can be completely impregnated with the resin. At the same time, the resin tank has heating and ultrasonic vibration functions, and has the ability to reduce the viscosity and enhance the fluidity of the resin contained inside. The beneficial effects of the resin impregnation module are: by controlling the temperature and ultrasonic vibration of the resin, the fluidity and impregnation ability of the resin are greatly improved, and defects such as bubbles in the resin and yarn can be eliminated. There is no need to use the yarn unfolding method in conventional technology, which reduces fiber damage caused by unfolding.

[0030] Furthermore, the extrusion wheel pair, the pultrusion die and the laser diameter measuring module are all fixedly connected to the upper end surface of the stand through a mounting bracket;

[0031] The extrusion wheel pair includes two extrusion wheels vertically oppositely arranged on a mounting bracket, both extrusion wheels are connected to the mounting bracket through a wheel axle, and a tension spring is arranged between the two extrusion wheels; the extrusion wheel pair can be adjusted and optimized by the size of the extrusion wheel and the selection of the tension spring.

[0032] The pultrusion die includes a die barrel with conical structures at both ends and a cylindrical structure in the middle. The die barrel is fixedly connected to the mounting bracket. A heat-shrinkable silicone tube is arranged inside the die barrel, and the inner diameter of the heat-shrinkable silicone tube is for the yarn to pass through. A hand screw is arranged outside the die barrel, and one end of the hand screw passes through the die barrel and is connected to the heat-shrinkable silicone tube. The internal silicone tube can be squeezed and adjusted by rotating the adjustment screw, thereby controlling the resin content of the yarn. Specifically, the inner diameter of the heat-shrinkable silicone tube is equal to the desired outer diameter of the dipped yarn, so that the dipped yarn after passing through the pultrusion die is shaped into a cylinder with a consistent diameter.

[0033] The laser diameter measuring module includes a laser emitting end, a laser receiving end and a digital display instrument which are electrically connected to each other. A vertical gap is provided between the laser emitting end and the laser receiving end for the yarn to pass through, so as to obtain the diameter of the dipped yarn in real time.

[0034] The function of the pultrusion die is as follows: compared with conventional hard dies, by setting a pultrusion die with an embedded heat-shrinkable silicone tube, the diameter of the dipped yarn can be accurately formed and the flexibility of the silicone tube reduces possible fiber breakage. In addition, the heat-shrinkable silicone tube has a larger inner diameter before heating, which can easily pass the yarn through, and then heat to shrink the inner diameter to prepare the dipped yarn, solving the problem that the existing technology cannot pass the yarn through a small inner diameter without damage and control the diameter of the dipped yarn.

[0035] Furthermore, the winding mechanism also includes a mounting plate with a bearing seat and a driving element, the winding shaft is fixed to the upper end surface of the stand through the bearing seat and the mounting plate, one end of the winding shaft is rotatably matched with the bearing seat; the other end of the winding shaft is connected to the yarn winding frame;

[0036] The driving element includes a driving motor with a controller arranged on the upper end surface of the stand, and the driving motor drives the winding shaft to rotate by belt transmission. The winding frame is a rectangular frame, and the cross section of the other end of the winding shaft is a square structure. Linear slide rails are arranged on both sides of the winding shaft, and the winding frame is connected to the other end of the winding shaft through the linear slide rails on both sides of the winding shaft; the winding frame includes two long bars and two polytetrafluoroethylene threaded tubes, the two long bars are arranged horizontally, and each long bar is provided with a plurality of connection holes along its length direction; two polytetrafluoroethylene threaded tubes are arranged between the two long bars, and both ends of each polytetrafluoroethylene threaded tube are fixedly connected to the two long bars through connection holes.

[0037] The function of the winding mechanism is: through the above-mentioned setting, the winding mechanism can pull and wind up the dipped yarn at a controllable speed. The polytetrafluoroethylene threaded tube on the winding frame can limit the unfolding behavior of the dipped yarn under the action of tension, so that the two ends of the dipped yarn after the winding frame can maintain the original cylindrical shape instead of flattening, which can keep the cross-sectional shape and resin content of the dipped yarn along the length direction stable. In addition, when the winding frame is rotating, it can automatically translate forward and backward along the axial direction under the action of the yarn tension, so that the dipped yarn will not be repeatedly stacked and bonded to the two polytetrafluoroethylene threaded tubes, but will be wound around the two polytetrafluoroethylene threaded tubes at intervals. While meeting this effect, it further reduces the complexity of the common technology that requires the use of additional drive devices, and simplifies the paper pattern process and efficiency.

[0038] The present invention also provides a sample preparation method of a dipped yarn sample preparation device, characterized in that it comprises:

[0039] Step 1: Place the yarn bobbin with the yarn on the yarn placing mechanism, remove one end of the yarn, pass it through the twist control structure, tension measurement module, resin impregnation module and molding module in sequence, and finally wind the yarn on the winding frame for multiple turns and bond the formed yarn circle;

[0040] Step 2: Pour the resin liquid with the right proportion and quality into the resin tank, then check and debug the drive parts, tension sensor and laser diameter measuring module in the yarn release mechanism, turn on the yarn release mechanism, and the yarn begins to be pulled and released from the yarn tube;

[0041] Step 3: After the dipped yarn sample preparation device has stabilized the sample preparation, monitor and analyze the current dipped yarn tension, cross-sectional shape, diameter and twist process parameters. If the expected values ​​are not met, the sample preparation is suspended and the corresponding module is debugged. If the expected values ​​are met, the sample preparation is continued until the yarn winding frame is saturated with non-overlapping dipped yarns or the resin operable time is reached;

[0042] Step 4: When the yarn winding frame is saturated with non-overlapping impregnated yarn or the sample preparation stops, the resin tank is removed so that the impregnated yarn that is not impregnated with resin is continuously and overlappingly wound on the remaining position of the yarn winding frame to form an unimpregnated impregnated yarn belt, the dry yarn at this position is bonded, the excess yarn that is not wound on the yarn winding frame is cut off, the yarn winding frame is removed, and it is placed in an oven or other environmental device for curing;

[0043] Step 5: If you continue to make samples, replace the new yarn winding frame and repeat steps 1 to 4. If the sample making is completed, disassemble the yarn tube, clean the device, store and organize the process parameter record values.

[0044] The above-mentioned sampling method realizes that in the process of dipped yarn sampling, real tension control and measurement, twist control, impregnation efficiency improvement, cross-section measurement and control can be achieved in all processes of winding, cutting, removing the winding frame and curing of the dipped yarn. In addition, the tension of the dipped yarn is kept from being unloaded, thereby realizing high-efficiency sampling with controllable tension.

[0045] The beneficial effects of the present invention are as follows: a dipped yarn sampling device and a sampling method thereof in the present invention, a sampling device and method consisting of a yarn unwinding mechanism, a twist control mechanism, a tension measurement module, a resin impregnation module, a molding module, a winding mechanism and a stand, realize real tension control and measurement, twist control, impregnation efficiency improvement, cross-section measurement and control in the dipped yarn sampling process, significantly improve the controllability of the process flow and the preparation efficiency, and solve the problems of weak process adjustment ability and low preparation efficiency of the prior art sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the three-dimensional structure of a dipped yarn sample preparation device.

[0047] Figure 2 It is a structural schematic diagram of the yarn releasing mechanism.

[0048] Figure 3 Schematic diagram of the twist control structure.

[0049] Figure 4 This is a schematic diagram of the structure of the tension measurement module.

[0050] Figure 5 Schematic diagram of the structure of the resin infiltration module.

[0051] Figure 6 It is a structural schematic diagram of the forming module.

[0052] Figure 7 It is a structural schematic diagram of the winding mechanism.

[0053] Among them, 1. stand; 2. yarn release mechanism; 201. magnetic powder brake; 202. coupling; 203. barrel shaft; 204. fixed top cone; 205. movable top cone; 3. winding mechanism; 301. winding shaft; 302. yarn winding frame; 3021. long rod; 3022. tetrafluoroethylene threaded tube; 303. bearing seat; 304. driving motor; 305. linear slide rail; 4. twist control structure; 401. bottom plate; 402. through hole; 403. torsion wheel; 4031. circular frame; 4032. first extrusion wheel ; 4033, stretching spring; 404, yarn clamping wheel pair; 405, limit wheel; 406, driver; 5, tension measurement module; 501, wheel seat; 502, tension yarn guide wheel; 503, tension sensor; 6, resin impregnation module; 601, resin tank; 602, impregnation yarn guide wheel; 603, mounting seat; 7, molding module; 701, extrusion wheel pair; 702, pultrusion die; 703, laser diameter measurement module; 7031, laser transmitting end; 7032, laser receiving end; 7033, digital display instrument; 8, controller. DETAILED DESCRIPTION

[0054] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0055] like Figure 1 As shown, the present invention provides a dipped yarn sampling device, which includes a stand 1, on which a yarn unwinding mechanism 2 and a winding mechanism 3 are arranged, and between the yarn unwinding mechanism 2 and the winding mechanism 3 are sequentially arranged a twist control structure 4 fixed to the top of the stand 1, a tension measurement module 5, a resin impregnation module 6 and a molding module 7; through the sampling device composed of the yarn unwinding mechanism 2, the twist control mechanism, the tension measurement module 5, the resin impregnation module, the molding module 7, the winding mechanism 3 and the stand 1, real tension control and measurement, twist control, impregnation efficiency improvement, cross-section measurement and control in the dipped yarn sampling process are realized, and effective control and adjustment are achieved for the four important process parameters in the above-mentioned dipped yarn preparation, which solves the problems of weak process adjustment ability and low preparation efficiency of the prior art sampling.

[0056] Specifically, Figure 2As shown, the yarn releasing mechanism 2 is used to fix the yarn bobbin wound with yarn and to release the yarn on the yarn bobbin with a controllable constant torque; as a specific setting method of the yarn releasing mechanism 2, the yarn releasing mechanism 2 includes a mounting plate whose bottom is fixedly connected to the upper end surface of the stand 1, and a magnetic powder brake 201 and a controller 8 electrically connected to it are arranged on the mounting plate, and the rotating shaft of the magnetic powder brake 201 is connected to the barrel shaft 203 through a coupling 202, and a fixed top cone 204 and a movable top cone 205 for fixing the yarn bobbin are arranged at intervals on the barrel shaft 203.

[0057] Specifically, the principle and function of the yarn unwinding mechanism 2 are as follows: the magnetic powder brake 201 is electrically connected to the tension controller 8, and the tension controller 8 controls the magnetic powder brake 201 to generate a constant torque. The fixed top cone 204 and the movable top cone 205 are respectively placed on both sides of the yarn tube and fastened to the surface of the barrel shaft 203, jointly limiting the relative rotation of the yarn tube and the barrel shaft 203. The fixed top cone 204 and the movable top cone 205 are both truncated cone-shaped and have serrated protrusions embedded along the circumference to clamp the inner wall of the yarn tube. The beneficial effect of the yarn unwinding mechanism 2 is as follows: when the yarn is pulled by the winding mechanism 3, the constant torque generated by the magnetic powder brake 201 is balanced with the tension on the yarn, and the unwinding mechanism allows the yarn wound on the yarn tube to be unwound with a controllable constant torque.

[0058] like Figure 3 As shown, the twist control structure 4 includes a bottom plate 401 fixedly connected to the upper end surface of the stand 1, a through hole 402 for the yarn to pass through is arranged on the bottom plate 401, a rotating twisting wheel 403 is arranged on the end surface of the bottom plate 401, and a yarn clamping wheel 404 is arranged on one side of the twisting wheel 403; specifically, as a specific setting mode of the twist control structure 4, the twist control structure 4 includes three limiting wheels 405 rotatably arranged on the end surface of the bottom plate 401, and the three limiting wheels 405 are arranged in a triangle, one of the limiting wheels 405 is connected to a driver 406, and the driver 406 drives the limiting wheel 405 to rotate around its own axis; the through hole 402 is arranged inside the three limiting wheels 405;

[0059] The torsion wheel 403 includes a circular frame 4031 arranged inside the three limiting wheels 405, the circumferential outer walls of the circular frame 4031 are in contact with or meshing with the outer contour surfaces of the three limiting wheels 405 respectively, and two first extrusion wheels 4032 are rotatably arranged inside the circular frame 4031, and a tension spring 4033 is arranged between the two first extrusion wheels 4032 for applying a pulling force to the two first extrusion wheels 4032 to make the two move toward each other.

[0060] The principle and function of the twist control structure 4 are as follows: the driver 406 drives the limiting wheel 405 to rotate, thereby driving the circular frame 4031 in contact with the three limiting wheels 405 and the two first extrusion wheels 4032 inside the circular frame 4031 to rotate, and the distance between the yarn clamping wheel pair 404 and the twisting wheel pair 403, the rotation speed and the rotation direction of the driver 406 can be adjusted according to the twisting demand, thereby realizing the real-time twisting or untwisting process during the continuous preparation of the dipped yarn sample making device, without the need to pre-twist or untwist the yarn on the yarn tube in advance, which significantly improves the controllability and preparation efficiency of the process.

[0061] like Figure 4 As shown, the tension measuring module 5 includes a wheel seat 501 fixedly connected to the upper end face of the stand 1, and at least one tension yarn guide wheel 502 is arranged on the wheel seat 501, and a tension sensor 503 is connected to one of the tension yarn guide wheels 502; specifically, as a specific implementation of the tension measuring module 5, three tension yarn guide wheels 502 arranged in an isosceles triangle structure are arranged on the wheel seat 501, each tension yarn guide wheel 502 is provided with a wheel axle and each wheel axle is fixedly connected to the wheel seat 501 through a circular hole or a waist hole, and the shaft of the tension sensor 503 is connected to the wheel axle of the tension yarn guide wheel 502 located at the top of the triangle.

[0062] The principle and function of the tension measurement module 5 are as follows: the wheel seat 501 is provided with a plurality of circular holes or waist holes, so as to realize the angle adjustment of the isosceles triangle formed by the centers of the three wheel axles. Furthermore, after the yarn passes through the three tension yarn guide wheels 502, pressure is generated on the tension sensor 503 in the middle, and the real yarn tension can be converted according to the angle of the isosceles triangle formed by the yarn. The tension sensor 503 should have the functions of real-time display and real-time recording. The beneficial effect produced by the tension measurement module 5 is as follows: by adjusting the position of the yarn guide wheel, the passing yarn forms an adjustable deflection angle, and the real yarn internal tension can be obtained and recorded according to the specific angle and mechanical decomposition.

[0063] like Figure 5 As shown, the resin impregnation module 6 includes a resin tank 601 and at least one impregnation yarn guide wheel 602 arranged in the resin tank 601, the resin tank 601 is filled with resin liquid, and the impregnation yarn guide wheel 602 is partially immersed in the liquid surface of the resin liquid; specifically, a mounting seat 603 is arranged on the top of the resin tank 601, and two wheel axles in an "L" shape are arranged horizontally at intervals on the mounting seat 603, and a impregnation yarn guide wheel 602 is arranged on each wheel axle; a heating module and an ultrasonic vibration module are integrated on the resin tank 601.

[0064] The principle and function of the resin impregnation module 6 are as follows: the L-shaped axle is higher than the resin liquid level in the resin tank 601, but the impregnation yarn guide wheel 602 is partially submerged below the resin liquid level to ensure that the passing yarn can be completely impregnated with the resin. At the same time, the resin tank 601 has heating and ultrasonic vibration functions, and has the ability to reduce the viscosity and enhance the fluidity of the resin contained inside. The beneficial effects produced by the resin impregnation module 6 are: by controlling the temperature and ultrasonic vibration of the resin, the fluidity and impregnation ability of the resin are greatly improved, and defects such as bubbles in the resin and yarn can be eliminated, and there is no need to adopt the yarn unfolding method in conventional technology, which reduces the fiber damage caused by unfolding.

[0065] like Figure 6 As shown, the molding module 7 includes an extrusion wheel pair 701, a pultrusion die 702 and a laser diameter measuring module 703 which are arranged in sequence; specifically, the extrusion wheel pair 701, the pultrusion die 702 and the laser diameter measuring module 703 are all fixedly connected to the upper end surface of the stand 1 through a mounting bracket;

[0066] The extrusion wheel pair 701 includes two extrusion wheels vertically oppositely arranged on a mounting bracket, both extrusion wheels are connected to the mounting bracket through a wheel axle, and a tension spring is arranged between the two extrusion wheels; the extrusion wheel pair 701 can be adjusted and optimized by the size of the extrusion wheel and the selection of the tension spring 4033.

[0067] The pultrusion die 702 includes a die barrel with conical structures at both ends and a cylindrical structure in the middle. The die barrel is fixedly connected to the mounting bracket. A heat-shrinkable silicone tube is arranged inside the die barrel, and the inner diameter of the heat-shrinkable silicone tube is for the yarn to pass through. A hand screw is arranged outside the die barrel, and one end of the hand screw passes through the die barrel and is connected to the heat-shrinkable silicone tube. The internal silicone tube can be squeezed and adjusted by rotating the adjustment screw, thereby controlling the resin content of the yarn. Specifically, the inner diameter of the heat-shrinkable silicone tube is equal to the desired outer diameter of the dipped yarn, so that the dipped yarn after passing through the pultrusion die 702 is shaped into a cylinder with a uniform diameter.

[0068] The laser diameter measuring module 703 includes a laser emitting end 7031, a laser receiving end 7032 and a digital display instrument 7033 which are electrically connected to each other. A vertical gap is provided between the laser emitting end 7031 and the laser receiving end 7032 for the yarn to pass through, so as to obtain the diameter of the dipped yarn in real time.

[0069] The function of the pultrusion die 702 is as follows: compared with conventional hard dies, by providing the pultrusion die 702 with an embedded heat shrinkable silicone tube, the diameter of the dipped yarn can be accurately shaped and the flexibility of the silicone tube reduces possible fiber breakage. In addition, the heat shrinkable silicone tube has a larger inner diameter before heating, and the yarn can be easily passed through, and then the inner diameter is reduced by heating to prepare the dipped yarn, which solves the problem that the existing technology cannot pass the yarn through a small inner diameter without damage and control the diameter of the dipped yarn.

[0070] like Figure 7 As shown, the winding mechanism 3 includes a rotating winding shaft 301, on which a yarn winding frame 302 is arranged, and the winding shaft 301 drives the yarn winding frame 302 to rotate and pull the yarn at a controllable speed to wind the yarn. Specifically, the winding mechanism 3 also includes a mounting plate with a bearing seat 303 and a driving element. The winding shaft 301 is fixed to the upper end surface of the stand 1 through the bearing seat 303 and the mounting plate, and one end of the winding shaft 301 is rotatably matched with the bearing seat 303; the other end of the winding shaft 301 is connected to the yarn winding frame 302;

[0071] The driving element includes a driving motor 304 provided on the upper end surface of the stand 1 and provided with a controller 8, and the driving motor 304 drives the winding shaft 301 to rotate by means of a belt transmission. The winding frame 302 is a rectangular frame, and the cross section of the other end of the winding shaft 301 is a square structure. Linear slide rails 305 are provided on both sides of the winding shaft 301, and the winding frame 302 is connected to the other end of the winding shaft 301 through the linear slide rails 305 on both sides of the winding shaft 301; the winding frame 302 includes two long bars 3021 and two tetrafluoroethylene threaded tubes 3022, the two long bars 3021 are provided horizontally, and each long bar 3021 is provided with a plurality of connection holes along its length direction; the two tetrafluoroethylene threaded tubes 3022 are provided between the two long bars 3021, and both ends of each tetrafluoroethylene threaded tube 3022 are fixedly connected to the two long bars 3021 through connection holes.

[0072] The function of the winding mechanism 3 is as follows: through the above-mentioned setting, the winding mechanism 3 can pull and wind up the dipped yarn at a controllable speed. The tetrafluoroethylene threaded tube 3022 on the winding frame 302 can limit the unfolding behavior of the dipped yarn under the action of tension, so that the two ends of the dipped yarn after the winding frame 302 can maintain the original cylindrical shape instead of flattening, which can keep the cross-sectional shape and resin content of the dipped yarn along the length direction stable. In addition, when the winding frame 302 is wound, it can automatically translate forward and backward along the axial direction under the action of the yarn tension, so that the dipped yarn will not be repeatedly stacked and bonded to the two tetrafluoroethylene threaded tubes 3022, but will be wound around the two tetrafluoroethylene threaded tubes 3022 at intervals. While meeting this effect, it further reduces the complexity of the common technology that requires the use of additional drive devices, and simplifies the paper pattern process and efficiency.

[0073] The present invention also provides a sample preparation method of a dipped yarn sample preparation device, characterized in that it comprises:

[0074] Step 1: Place the yarn tube with the yarn on the yarn placing mechanism 2, remove one end of the yarn, and pass it through the twist control structure 4, the tension measuring module 5, the resin impregnation module 6 and the molding module 7 in sequence, and finally wind the yarn multiple times on the winding frame 302, and bond the formed yarn circle;

[0075] Step 2: Pour the resin liquid with a good proportion and quality into the resin tank 601, then check and debug the drive component, tension sensor 503 and laser diameter measuring module 703 in the yarn release mechanism 2, turn on the yarn release mechanism 2, and the yarn begins to be pulled and released from the yarn tube;

[0076] Step 3: After the dipped yarn sample preparation device has stabilized the sample preparation, monitor and analyze the current dipped yarn tension, cross-sectional shape, diameter and twist process parameters. If the expected values ​​are not met, the sample preparation is suspended and the corresponding module is debugged. If the expected values ​​are met, the sample preparation is continued until the yarn winding frame 302 is saturated with non-overlapping dipped yarns or the resin operable time is reached;

[0077] Step 4: When the yarn winding frame 302 is saturated with non-overlapping impregnated yarn or the sample preparation stops, the resin tank 601 is removed, so that the impregnated yarn that has not been impregnated with resin is continuously and overlappingly wound on the remaining position of the yarn winding frame 302 to form an unimpregnated impregnated yarn band, the dry yarn at this position is bonded, the excess yarn that has not been wound on the yarn winding frame 302 is cut off, the yarn winding frame 302 is removed, and placed in an oven or other environmental device for curing;

[0078] Step 5: If the sample preparation is to be continued, replace the new yarn winding frame 302 and repeat steps 1 to 4. If the sample preparation is completed, disassemble the yarn tube, clean the device, and store and organize the process parameter record values.

[0079] The above-mentioned sampling method realizes that in the process of dipped yarn sampling, real tension control and measurement, twist control, impregnation efficiency improvement, cross-section measurement and control can be achieved in all processes of winding, cutting, removing the winding frame and curing of the dipped yarn. In addition, the tension of the dipped yarn is kept from being unloaded, thereby realizing high-efficiency sampling with controllable tension.

[0080] In summary, the present invention provides a dipped yarn sampling device and a sampling method thereof, which are composed of a yarn unwinding mechanism 2, a twist control mechanism, a tension measurement module 5, a resin impregnation module, a molding module 7, a winding mechanism 3 and a stand 1, and the sampling device and method realize real tension control and measurement, twist control, impregnation efficiency improvement, cross-section measurement and control in the dipped yarn sampling process, significantly improve the controllability of the process flow and the preparation efficiency, and solve the problems of weak process adjustment ability and low preparation efficiency of the prior art sampling.

Claims

1. A dipped yarn sample preparation device, characterized in that: It comprises a stand, on which a yarn unwinding mechanism and a winding mechanism are arranged, and between the yarn unwinding mechanism and the winding mechanism, a twist control structure fixed to the top of the stand, a tension measuring module, a resin impregnation module and a molding module are arranged in sequence; The yarn releasing mechanism is used to fix the yarn bobbin wound with yarn and to release the yarn on the yarn bobbin at a controllable constant torque; The twist control structure comprises a bottom plate fixedly connected to the upper end surface of the stand, the bottom plate is provided with a through hole for the yarn to pass through, a rotating twisting wheel is provided on the end surface of the bottom plate, and a yarn clamping wheel is provided on one side of the twisting wheel; The tension measuring module comprises a wheel seat fixedly connected to the upper end surface of the stand, and at least one tension yarn guide wheel is arranged on the wheel seat, and a tension sensor is connected to one of the tension yarn guide wheels; The resin impregnation module comprises a resin tank and at least one resin impregnation yarn guide wheel arranged in the resin tank, the resin tank is filled with resin liquid, and the resin impregnation yarn guide wheel is partially immersed in the liquid surface of the resin liquid; The forming module comprises an extrusion wheel pair, a pultrusion die and a laser diameter measuring module which are arranged in sequence; The winding mechanism comprises a rotating winding shaft, on which a yarn winding frame is arranged. The winding shaft drives the yarn winding frame to rotate and pulls the yarn at a controllable speed for yarn winding.

2. The dipped yarn sample preparation device according to claim 1, characterized in that: The yarn unwinding mechanism comprises a mounting plate whose bottom is fixedly connected to the upper end surface of the stand, a magnetic powder brake and a controller electrically connected thereto are arranged on the mounting plate, the rotating shaft of the magnetic powder brake is connected to a barrel shaft via a coupling, and a fixed top cone and a movable top cone for fixing the yarn barrel are arranged at intervals on the barrel shaft.

3. The dipped yarn sample preparation device according to claim 1, characterized in that: The twist control structure comprises three limiting wheels rotatably arranged on the end surface of the bottom plate, the three limiting wheels are arranged in a triangle, one of the limiting wheels is connected to a driver, and the driver drives the limiting wheel to rotate around its own axis; the through holes are arranged inside the three limiting wheels; The torsion pair of wheels includes a circular frame arranged inside the three limiting wheels, the circumferential outer walls of the circular frame are respectively in contact with or meshed with the outer contour surfaces of the three limiting wheels, two first extrusion wheels are rotatably arranged inside the circular frame, and a tension spring is arranged between the two first extrusion wheels for applying a pulling force to the two first extrusion wheels so that the two wheels move toward each other.

4. The dipped yarn sample preparation device according to claim 1, characterized in that: The wheel seat is provided with three tension yarn guide wheels arranged in an isosceles triangle structure, each tension yarn guide wheel is provided with a wheel axle and each wheel axle is fixedly connected to the wheel seat through a round hole or a waist hole, and the shaft of the tension sensor is connected to the wheel axle of the tension yarn guide wheel located at the top of the triangle.

5. The dipped yarn sample preparation device according to claim 1, characterized in that: The resin impregnation module also includes a mounting base fixedly connected to the upper surface of the stand, and two "L"-shaped axles are horizontally spaced apart on the mounting base, and each of the axles is provided with a resin impregnation yarn guide wheel; the resin tank is located below the mounting base, and a heating module and an ultrasonic vibration module are integrated on the resin tank.

6. The dipped yarn sample preparation device according to claim 1, characterized in that: The extrusion wheel pair, pultrusion die and laser diameter measuring module are all fixedly connected to the upper end surface of the stand through a mounting bracket; The extrusion wheel pair includes two extrusion wheels vertically oppositely arranged on the mounting bracket, the two extrusion wheels are connected to the mounting bracket through a wheel axle, and a tension spring is arranged between the two extrusion wheels; The pultrusion die comprises a die barrel with conical structures at both ends and a cylindrical structure in the middle, the die barrel is fixedly connected to the mounting bracket, a heat shrinkable silicone tube is arranged in the die barrel, and the inner diameter of the heat shrinkable silicone tube is for the yarn to pass through; a hand screw is arranged outside the die barrel, and one end of the hand screw passes through the die barrel and is connected to the heat shrinkable silicone tube; The laser diameter measuring module comprises a laser emitting end, a laser receiving end and a digital display instrument which are electrically connected to each other, and a vertical gap for the yarn to pass through is arranged between the laser emitting end and the laser receiving end.

7. The dipped yarn sample preparation device according to claim 6, characterized in that: The inner diameter of the heat shrinkable silicone tube is equal to the desired outer diameter of the dipped yarn.

8. The dipped yarn sample preparation device according to claim 1, characterized in that: The winding mechanism also includes a mounting plate with a bearing seat and a driving element. The winding shaft is fixed to the upper end surface of the stand through the bearing seat and the mounting plate. One end of the winding shaft is rotatably matched with the bearing seat. The other end of the winding shaft is connected to the yarn winding frame. The driving element comprises a driving motor which is arranged on the upper end surface of the platform and has a controller. The driving motor drives the winding shaft to rotate by belt transmission.

9. The dipped yarn sample preparation device according to claim 8, characterized in that: The yarn winding frame is a rectangular frame, and the cross-section of the other end of the winding shaft is a square structure. Linear slide rails are provided on both sides of the winding shaft, and the yarn winding frame is connected to the other end of the winding shaft through the linear slide rails on both sides of the winding shaft; the yarn winding frame includes two long rods and two polytetrafluoroethylene threaded tubes, the two long rods are horizontally arranged, and each long rod is provided with a plurality of connecting holes along its length direction; the two polytetrafluoroethylene threaded tubes are arranged between the two long rods, and the two ends of each polytetrafluoroethylene threaded tube are fixedly connected to the two long rods through connecting holes.

10. A sample preparation method of the dipped yarn sample preparation device according to any one of claims 1 to 9, characterized in that: include: Step 1: Place the yarn bobbin with the yarn on the yarn placing mechanism, remove one end of the yarn, pass it through the twist control structure, tension measurement module, resin impregnation module and molding module in sequence, and finally wind the yarn on the winding frame for multiple turns and bond the formed yarn circle; Step 2: Pour the resin liquid with the right proportion and quality into the resin tank, then check and debug the drive parts, tension sensor and laser diameter measuring module in the yarn release mechanism, turn on the yarn release mechanism, and the yarn begins to be pulled and released from the yarn tube; Step 3: After the dipped yarn sample preparation device has stabilized the sample preparation, monitor and analyze the current dipped yarn tension, cross-sectional shape, diameter and twist process parameters. If the expected values ​​are not met, the sample preparation is suspended and the corresponding module is debugged. If the expected values ​​are met, the sample preparation is continued until the yarn winding frame is saturated with non-overlapping dipped yarns or the resin operable time is reached; Step 4: When the yarn winding frame is saturated with non-overlapping impregnated yarn or the sample preparation stops, the resin tank is removed so that the impregnated yarn that is not impregnated with resin is continuously and overlappingly wound on the remaining position of the yarn winding frame to form an unimpregnated impregnated yarn belt, the dry yarn at this position is bonded, the excess yarn that is not wound on the yarn winding frame is cut off, the yarn winding frame is removed, and it is placed in an oven or other environmental device for curing; Step 5: If you continue to make samples, replace the new yarn winding frame and repeat steps 1 to 4. If the sample making is completed, disassemble the yarn tube, clean the device, store and organize the process parameter record values.

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