Quantitative control device and sample preparation method for reinforced fiber dipped yarn

Abstract

The invention discloses a quantitative control device and a sample preparation method for reinforced fiber dipped yarn, comprising a frame; a tension control device, the tension control device comprising 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; a resin viscosity control device, the resin viscosity control device comprising a moving trolley, a resin tank and a resin heating tank, the resin tank is located in the resin heating tank, the raw yarn is dipped in the resin tank, the moving trolley is electrically connected to the tension controller and moves in the length direction of the raw yarn support roller as the dipped yarn is wound on the dipped yarn winding frame; a resin content control device, comprising a pressure roller frame, an upper pressure roller, a lower pressure roller and a first row of forks. The beneficial effects of the invention are: several parameters that determine the mechanical properties of the fiber in the process of reinforcing fiber dipped yarn sampling: tension, resin viscosity, and resin content are quantitatively controlled, and the sample is more stable in quality through a quantitatively controllable preparation process.

Description

Technical Field

[0001] The invention relates to a quantitative control device and a sample preparation method for reinforcing fiber dipped yarn sample preparation. Background Art

[0002] Reinforced fiber dipped yarn is a cylindrical tow-shaped composite material made by impregnating the reinforcing fiber tow with liquid resin and curing it. This material is generally used as a test specimen to test its tensile properties. This test method is the most conventional and intuitive method to evaluate the mechanical properties of reinforcing fibers.

[0003] A standard dipped yarn sample has a straight surface, uniform dipped, no burrs, broken yarn, no hanging resin colloid, no fiber dislocation, and is in a clustered shape with a round and bright color. At the same time, the mass content of the resin and fiber of the sample must be within the range specified by the standard. Otherwise, the sample does not meet the above description and should be discarded and cannot be used for testing.

[0004] However, even for samples that meet the above requirements, data instability may still occur during the test. After the dipped yarn samples of the same model but different yarn rolls are prepared in sequence, the test data may be quite different. Usually in this case, the technicians will compare and analyze the data results. In most cases, the reasons for the differences can be traced back to the sample preparation process. The conclusion is that during the sample preparation process, the tension, resin viscosity, and resin content of the sample cannot be quantitatively controlled, resulting in differences in test results. Therefore, repeated sampling due to data differences often occurs. The instability of the data forces the testing agency to invest personnel in repetitive work, which not only reduces work efficiency, but also forces the relevant technicians to work overtime and become exhausted in order to frequently repeat the test or ensure the timely delivery of reports to customers.

[0005] The tension of the dipped yarn affects the straightness of the sample after molding. If the reinforcing fiber bends in its reinforcing direction (fiber direction), the actual measured data of the final mechanical properties (tensile strength) will be reduced. Since the most commonly used tension control method is the mechanical friction method introduced in the standard (GB / T20310-2006 Preparation and tensile strength determination of glass fiber untwisted coarse yarn dipped yarn sample), the reinforcing fiber (raw yarn) is passed through the roller to adjust the number and angle of the yarn passing through the roller, so that the friction between the yarn and the roller will generate resistance, which is converted into the tension of the yarn, so that the yarn is taut and straight. Too little tension will cause the yarn to bend and affect the test data; too much tension means that the friction resistance between the yarn and the roller will also increase. Excessive resistance will cause the yarn to break in the actual process, which will also cause damage to the yarn before molding, and will still affect the test data in the end.

[0006] Resin viscosity and resin content are two interrelated technical indicators. Resin viscosity affects the speed and effect of resin impregnation of fibers. In theory, the lower the resin viscosity, the better the resin fluidity, the faster the fiber impregnation speed, and the better the effect; conversely, the worse the resin fluidity, the slower the impregnation speed, and the worse the effect. Resin content describes the volume or mass ratio of resin and fiber in a composite material. Resin protects fibers and transfers loads in composite materials. Low resin content will cause uneven local load transfer, leading to premature failure of weak points and affecting test results; conversely, excessive resin content will easily cause sample beads, and these beads will produce stress concentration, which will also cause premature failure of the sample. Therefore, the resin content must be controlled within a certain range. Resin viscosity will affect the resin content to a certain extent. If the viscosity is too low, the resin fluidity is very large, which will make the resin content relatively low; conversely, if the viscosity is high, the resin fluidity is poor, and the resin is easy to adhere to the fiber surface. Without external intervention, it is difficult to remove, resulting in high resin content and even beads.

[0007] The standard mentions tension control, resin content control, and resin viscosity control, but there is no specific quantitative control solution. Even some non-quantitative solutions are difficult to implement or the results after implementation are not ideal. For example, the resin content control device, the standard shows that a circular hole with a moderate diameter is used to let the impregnated yarn pass through the circular hole to filter out excess resin. However, in the actual sample preparation process, the yarn density (thickness) is inconsistent. The yarn with a low linear density has a diameter of only 0.3mm or even less. It is not convenient to pass the yarn through a circular hole of this size. Summary of the invention

[0008] The purpose of the present invention is to provide a quantitative control device in the sample preparation of reinforcing fiber dipped yarn, so as to solve the technical defects in the prior art that the tension, resin viscosity and resin content are difficult to control during the sample preparation process of reinforcing fiber dipped yarn.

[0009] To solve the above problems, the technical scheme adopted by the present invention is: a quantitative control device in the sample preparation process of reinforced fiber dipped yarn, including a frame; a tension control device, the tension control device including a tension controller, a driving device, a magnetic powder clutch, a magnetic powder brake, a dipped yarn winding frame and an original yarn support roller, the driving device is installed on the frame, the input shaft of the magnetic powder clutch is connected to the driving device, the output shaft of the magnetic powder clutch is connected to the dipped yarn winding frame, the driving device drives the dipped yarn winding frame to rotate through the magnetic powder clutch, and is used to wind the dipped yarn on the dipped yarn winding frame, the magnetic powder brake is installed on the frame, one end of the original yarn support roller is connected to the input shaft of the magnetic powder brake for placing the original yarn, and the magnetic powder clutch and the magnetic powder brake are both electrically connected to the tension controller; a resin viscosity control device, the resin viscosity control device is arranged between the dipped yarn winding frame and the original yarn support roller, and the resin viscosity control device The invention comprises a movable trolley, a resin tank and a resin heating tank, wherein the resin tank is located in the resin heating tank, and the resin heating tank is used to heat the resin placed in the resin tank. The raw yarn is dipped in the resin tank, and the movable trolley is electrically connected to the tension controller and moves in the length direction of the raw yarn support roller as the dipped yarn is wound on the dipped yarn winding frame; a resin content control device comprises a pressure roller frame, an upper pressure roller, a lower pressure roller and a first row of forks, both ends of the upper pressure roller and the lower pressure roller are arranged on the pressure roller frame, and the upper pressure roller can move up and down relative to the pressure roller frame to adjust the distance between the upper pressure roller and the lower pressure roller, and the first row of forks is arranged on a side close to the dipped yarn winding frame, and a plurality of first dipped yarn channels of different widths are opened thereon, and after the raw yarn is dipped in the resin tank, it passes between the upper pressure roller and the lower pressure roller and then passes through the first dipped yarn channel and is wound on the dipped yarn winding frame, and excess resin is filtered out of the raw yarn when passing through the first dipped yarn channel. The present invention adopts a magnetic powder clutch to control the speed of winding the dipped yarn by the dipped yarn winding frame, and cooperates with the magnetic powder brake to control the speed of releasing the yarn by the yarn support roller, so as to control the tension of the yarn during the dipping process. The resin heating tank in the present invention heats the resin tank placed therein to maintain the temperature of the resin and make the resin viscosity moderate. The present invention arranges an upper pressing roller and a lower pressing roller to remove part of the excess resin on the dipped yarn. The first row of forks in the present invention, when the dipped yarn passes through the first dipped yarn channel, the first dipped yarn channel filters out the excess resin on the dipped yarn, so that the resin content on the dipped yarn is controlled. In the present invention, since there are multiple first dipped yarn channels on the first row of forks with different widths, the dipped yarn can pass through an appropriate first dipped yarn channel as needed, thereby improving the versatility of the present invention.

[0010] As a further improvement of the present invention, the pressure roller frame is arranged on the resin tank near one end of the impregnated yarn winding frame, and the first row of forks is arranged in the resin tank, and the excess resin filtered out by the pressure roller frame flows back into the resin tank. In the present invention, the filtered out resin flows back into the resin tank, and the refluxed resin can be reused on the one hand, and the environmental conditions of the present invention can be improved on the other hand.

[0011] As a further improvement of the present invention, the resin heating tank is composed of an inner and outer layer, and a heat transfer oil inlet pipe and a heat transfer oil outlet pipe are connected to one end of the resin heating tank. The heat transfer oil inlet pipe and the heat transfer oil outlet pipe are both connected to the oil temperature circulation control device for flowing heat transfer oil into the resin heating tank. The present invention uses heat transfer oil to be introduced into the resin heating tank to increase the temperature and maintain the subsequent resin temperature.

[0012] As a further improvement of the present invention, a positioning frame is provided between the raw yarn support roller and the resin tank, the positioning frame moves synchronously with the movement of the trolley, a positioning hole is provided on the positioning frame, and the raw yarn enters the resin dipping tank after passing through the positioning hole. The present invention is provided with a positioning frame, and the raw yarn passes through the positioning hole, so that the raw yarn will not bend in the length direction of the raw yarn support roller after passing through the positioning hole, thereby improving the quality of fiber dipping sample preparation.

[0013] As a further improvement of the present invention, a support rod is arranged on the trolley in the direction of the original yarn support roller, and the positioning frame is arranged on the support rod. The present invention fixes the positioning frame on the trolley by arranging the support rod, so that the positioning frame moves synchronously with the trolley.

[0014] As a further improvement of the present invention, an electronic balance is also included to weigh the mass of the cut length of the dipped yarn. The present invention can use the electronic balance to weigh the mass of the dipped yarn, thereby calculating the density of the dipped yarn, and calculating the content of the resin in the dipped yarn according to the density of the original yarn and the density of the dipped yarn.

[0015] As a further improvement of the present invention, more than two pressing rollers are arranged in the resin tank to press the raw yarn into the resin in the resin tank. The present invention arranges the pressing rollers so that the raw yarn is immersed below the resin liquid level during the dipping process to ensure the quality of the dipping yarn.

[0016] As a further improvement of the present invention, a second row of forks is provided at one end of the resin tank close to the raw yarn support roller, and a plurality of second dipped yarn channels are provided on the second row of forks, and the raw yarn is dipped into the resin after passing through the second dipped yarn channels. The second row of forks is provided in the present invention so that the portion of the raw yarn located in the resin tank will not bend in the length direction of the raw yarn support roller, and the quality of fiber dipped sample preparation is further improved.

[0017] Another object of the present invention is to provide a method for preparing a sample of a reinforcing fiber dipped yarn, using a quantitative control device in the process of preparing a sample of a reinforcing fiber dipped yarn, comprising the following steps:

[0018] Step 1, pulling out the original yarn end from the yarn roll or yarn tube, and making the original yarn pass through the positioning hole, the second dipped yarn channel, the pressure roller in the resin tank, the upper pressure roller and the lower pressure roller and the first dipped yarn channel in sequence, and then pulling it to the dipped yarn winding frame;

[0019] Step 2, mix the resin main agent and the curing agent evenly and inject them into the resin tank, adjust the temperature in the resin tank to the temperature specified by the standard and start timing with a timer;

[0020] Step 3, manually pulling the end of the original yarn, pulling the dipped yarn to the dipped yarn winding frame, adjusting the tension controller, starting to wind the dipped yarn until it is wound to the dipped yarn winding frame and then pausing the winding;

[0021] Step 4, cutting a section of dipped yarn and testing the resin content in the dipped yarn, and adjusting the distance between the upper pressing roller and the lower pressing roller until the resin content in the dipped yarn meets the standard requirements, and formally winding the dipped yarn;

[0022] Step 5, after the dipped yarn winding frame is fully covered with the dipped yarn, the dipped yarn winding frame stops winding, and a new dipped yarn winding frame is replaced to continue winding;

[0023] Step 6. When the time displayed on the timer exceeds the appropriate time that the resin viscosity can be maintained, the sample preparation should be stopped immediately, and new resin should be replaced, and steps 1 to 5 should be repeated.

[0024] As a further improvement of the present invention, the test of the resin content in the dipped yarn in step 4 comprises:

[0025] Step 4.1, cut a length of raw yarn L1, weigh its mass as M1 on an electronic scale, and calculate the density of the raw yarn ρ1=M1 / L1;

[0026] Step 4.2, cut a length of dipped yarn L2, weigh its mass as M2 on an electronic scale, and calculate the density of the dipped yarn ρ2=M2 / L2;

[0027] Step 4.3, calculate the resin content in the dipped yarn ω2 = (ρ2-ρ1) / ρ2;

[0028] Step 4.4: Repeat steps 4.1 to 4.4 until the resin content meets the standard range.

[0029] In summary, the beneficial effects of the present invention are as follows: the present invention adopts magnetic powder clutch, magnetic powder brake, tension controller and resin heating tank to quantitatively control several parameters that determine the mechanical properties of the fiber during the sample preparation process of the reinforced fiber dipped yarn: tension, resin viscosity, resin content, etc., breaking the conventional observation method to estimate the quality of the sample preparation, making the sample preparation process more rigorous and orderly, and the sample quality is more stable through the quantitative controllable preparation process, reducing or even eliminating the situation that affects the test data due to sample preparation technology reasons. For the testing agency, the stable sample can effectively reduce the number of repeated samples and the number of mechanical property tests, thereby reducing labor costs (rework rate) and improving the timeliness of the report. Not only that, this quantitative method allows all important links of sample preparation to be controlled, and also allows technicians to conduct in-depth research on the impact of changes in tension, resin content, and resin viscosity on the sample, explore the sample preparation scheme that is closest to the real performance of the material, and formulate and revise relevant technical indicators More complete and rigorous standards, contribute to the standardization of the testing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a schematic diagram reflecting the resin content control device in the present invention.

[0032] Wherein: 1. Frame; 2. Tension controller; 3. Magnetic powder clutch; 4. Magnetic powder brake; 5. Dipped yarn winding frame; 6. Raw yarn support roller; 7. Moving trolley; 8. Resin tank; 9. Resin heating tank; 10. Pressing roller frame; 11. Upper pressing roller; 12. Lower pressing roller; 13. First row of forks; 14. First dipped yarn channel; 15. Heat transfer oil inlet pipe; 16. Heat transfer oil outlet pipe; 17. Positioning frame; 18. Positioning hole; 19. Support rod; 20. Pressing roller; 21. Second row of forks; 22. Second dipped yarn channel; 23. Fork fixing plate. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 and Figure 2 The quantitative control device in the sample preparation process of the reinforced fiber dipped yarn shown includes a frame 1, a tension control device and a resin content control device.

[0036] The tension control device includes a tension controller 2, a driving device (not shown in the figure), a magnetic powder clutch 3, a magnetic powder brake 4, a dipped yarn winding frame 5 and an original yarn support roller 6. The driving device preferably adopts a motor, and the motor is detachably mounted on the frame 1 by bolts. The magnetic powder clutch 3 is detachably mounted on the frame 1 by bolts. The input shaft of the magnetic powder clutch 3 is connected to the output shaft of the motor by a coupling. The output shaft of the magnetic powder clutch 3 is connected to the dipped yarn winding frame 5. The dipped yarn winding frame 5 in the present invention is a rectangular frame structure, a connecting shaft is arranged in the middle, and the connecting shaft is connected to the output shaft of the magnetic powder clutch 3. The motor drives the dipped yarn winding frame 5 to rotate through the magnetic powder clutch 3, which is used to wind the dipped yarn on the dipped yarn winding frame 5, so that the dipped yarn is continuously and sequentially arranged in parallel on the yarn frame, in preparation for subsequent sample collection. The magnetic powder brake 4 is installed on the frame 1, one end of the raw yarn support roller 6 is connected to the input shaft of the magnetic powder brake 4 for placing the yarn roll or yarn tube wound with the raw yarn, the magnetic powder clutch 3 and the magnetic powder brake 4 are both electrically connected to the tension controller 2, and the tension controller 2 controls the rotation speed of the dipped yarn winding frame 5 and the raw yarn support roller 6 to ensure the tension of the raw yarn during the dipping process.

[0037] The magnetic powder brake 4 described in the present invention controls the rotation speed according to the tension setting of the tension controller 2 and drives the yarn tube or yarn reel to rotate, which is used for unwinding the yarn tube or yarn reel (providing reinforcing fibers) for impregnation with resin. The tension of the yarn is collected by the tension controller 2 and the rotation speed of the magnetic powder brake 4 is automatically adjusted. The magnetic powder brake 4 provides and maintains the corresponding constant tension through the speed difference with the rotation of the magnetic powder clutch 3.

[0038] The resin viscosity control device is arranged between the dipped yarn winding frame 5 and the raw yarn support roller 6, and the resin viscosity control device includes a moving trolley 7, a resin tank 8 and a resin heating tank 9. The resin tank 8 is located in the resin heating tank 9, and the resin heating tank 9 is used to heat the resin placed in the resin tank 8. The raw yarn is dipped in the resin tank 8. The moving trolley 7 is electrically connected to the tension controller 2 and moves in the length direction of the raw yarn support roller 6 as the dipped yarn is wound on the dipped yarn winding frame 5; the resin heating tank 9 described in the present invention includes an inner and outer layer, and a heat-conducting oil cavity is formed between the inner and outer layers. The inner layer is made of metal material to facilitate heat conduction into the resin tank 8, so that the resin in the resin tank 8 is heated faster, and the outer layer of the resin heating tank 9 is coated with a vacuum insulation board, etc. The material has excellent heat insulation performance to prevent heat from being lost to the outside. In the present invention, a heat-conducting oil inlet pipe 15 and a heat-conducting oil outlet pipe 16 are connected to one end of the resin heating tank 9 close to the raw yarn support roller 6. The heat-conducting oil inlet pipe 15 and the heat-conducting oil outlet pipe 16 are both connected to an oil temperature circulation control device (the prior art, not shown in the figure) for flowing heat-conducting oil into the resin heating tank 9. The oil temperature circulation control device increases the temperature of the heat-conducting oil and enters the heat-conducting oil cavity in the resin heating tank 9 from the heat-conducting oil inlet pipe 15. The heat-conducting oil with a slightly lower temperature after exchanging energy with the resin heating tank 9 flows out from the heat-conducting oil outlet pipe 16 and enters the oil temperature circulation control device again for heating, so that the heat-conducting oil circulates to heat the resin tank 8 in the resin heating tank 9, so that the resin in the resin tank 8 is maintained within an optimal temperature range.

[0039] The resin content control device comprises a roller frame 10, an upper roller 11, a lower roller 12 and a first row of forks 13. Both ends of the upper roller 11 and the lower roller 12 are arranged on the roller frame 10, and both ends of the upper roller 11 can move up and down relative to the roller frame 10 to adjust the distance between the upper roller 11 and the lower roller 12. The present invention can be provided with a vertical slide groove on the roller frame 10, and screw rods are rotatably arranged at both ends of the upper roller 11. The screw rods are connected to the roller frame 10 by bearings, and the two ends of the upper roller 11 are driven to slide vertically by rotating the screw rods. The first row of forks 13 described in the present invention are arranged on a side close to the dipped yarn winding frame 5, and a plurality of first dipped yarn channels 14 of different widths are opened thereon. After the original yarn is dipped in the resin tank 8, it passes between the upper pressure roller 11 and the lower pressure roller 12 and then is wound on the dipped yarn winding frame 5 through the first dipped yarn channel 14. When the original yarn passes through the first dipped yarn channel 14, excess resin is filtered out. The present invention preferably has a plurality of first fixing rods fixed side by side along the length direction at the bottom of the first row of forks 13, and a first dipped yarn channel 14 is formed between two adjacent first fixing rods.

[0040] The present invention preferably fixes (such as welding) the bottom end of the pressure roller frame 10 on the resin tank 8 near one end of the dipped yarn winding frame 5, and the first row of forks 13 is set in the resin tank 8, and the excess resin filtered out flows back into the resin tank 8. The present invention fixes row fork fixing plates 23 on both sides of the resin tank 8, and the two ends of the first row of forks 13 are respectively connected to the two row fork fixing plates 23 (such as welding), and the row fork fixing plates 23 support the first row of forks 13 above the resin tank 8. The top of the end of the resin tank 8 near the dipped yarn winding frame 5 in the present invention is inclined toward the direction of the dipped yarn winding frame 5 to form an inclined surface, so that the excess resin filtered out by the first row of forks 13 can flow into the resin tank 8 more smoothly. The resin tank 8 described in the present invention is provided with more than two pressing rollers 20 for pressing the raw yarn into the resin in the resin tank 8. The preferred number of pressing rollers 20 in the present invention is two, and the two ends of the two pressing rollers 20 are respectively connected to the inner wall of the resin tank 8, and when in use, the pressing rollers 20 are located below the liquid level of the resin to keep the raw yarn immersed in the resin.

[0041] The present invention provides a second row of forks 21 at one end of the resin tank 8 near the raw yarn support roller 6, and the second row of forks 21 is provided with a plurality of second dipped yarn channels 22, and the raw yarn passes through the second dipped yarn channels 22 and then is immersed in the resin. A plurality of second fixing rods are fixed to the top of the second row of forks 21 in the present invention, and a second dipped yarn channel 22 is formed between two adjacent second fixing rods. The widths of the second dipped yarn channels in the present invention are equal, and are equal to or slightly larger than the diameter of the raw yarn. The number of the second dipped yarn channels 22 is equal to the number of the first dipped yarn channels 14, and the second dipped yarn channels 22 correspond to the first dipped yarn channels 14, and the corresponding second dipped yarn channels 22 and the centers of the first dipped yarn channels 14 are located on the same horizontal line, so that the raw yarn passing through the second dipped yarn channels 22 and the dipped yarn passing through the first dipped yarn channels 14 remain in a horizontal state without bending.

[0042] The present invention is provided with a positioning frame 17 between the raw yarn support roller 6 and the resin tank 8. The positioning frame 17 moves synchronously with the movement of the trolley. The positioning frame 17 is provided with a positioning hole 18. The raw yarn enters the resin tank 8 after passing through the positioning hole 18. The present invention preferably provides a plurality of support rods 19 on the moving trolley 7 in the direction of the raw yarn support roller 6. The present invention preferably provides two support rods 19. The two support rods 19 are parallel and located on the same horizontal plane. The positioning frame 17 is provided on the support rods 19. During the winding process, the yarn needs to pass through the positioning hole 18 to ensure that the route of the yarn under the tension control device is basically consistent, thereby ensuring the stability of the tension, and also ensuring that the parallel arrangement of the yarn wound on the dipped yarn frame will not deviate.

[0043] The present invention is provided with an electronic balance (not shown in the figure) for weighing the mass of the cut length of the dipped yarn to facilitate testing the resin content in the dipped yarn. The present invention preferably uses an electronic balance with an accuracy of one ten-thousandth to improve the accuracy of the test of the resin content in the dipped yarn. The electronic balance in the present invention can be placed in any position that does not affect the sample preparation of the dipped yarn and is only used when testing the resin content in the dipped yarn. For example, a support platform for placing the electronic balance can be specially provided on the frame 1.

[0044] The resin tank 8 and the resin heating tank 9 in the present invention can be separated, which is convenient for cleaning the resin tank 8 after the sample preparation is completed. The resin tank 8 in the present invention is an independent metal box. Through heat conduction, heat is obtained from the resin heating tank 9 and transferred to the liquid resin in the resin tank 8, so that the resin is evenly heated. The oil temperature circulation control device provides a heat source for the resin heating tank 9 in the form of heat-conducting oil. The crimping roller 20 is an object placed under the resin liquid level in the resin tank 8, which is used to keep the fiber immersed in the resin. The present invention can use a timer to record the working time of the resin, which is a key link in controlling the viscosity of the resin. Because at a certain ambient temperature, the viscosity of the resin will generally decrease slightly and then gradually increase with the increase of time, so we can obtain the viscosity-time comparison table of the change of the viscosity of the resin over time in advance. In the actual experiment, we can know the effective time that the resin can be used at a certain ambient temperature by comparing the viscosity-time comparison table according to the viscosity range specified in the standard, and then record the time according to the timer. When the time reaches the effective time of the resin, it is necessary to replace the newly configured resin. In this way, the controllability of the resin viscosity can be ensured, and the resin impregnation and the corresponding tensile properties of the dipped yarn under different viscosities can be studied. The function of the mobile trolley in the present invention is to move synchronously along the width direction of the creel according to the speed of the magnetic powder clutch rotation when the magnetic powder clutch in the tension control device starts to work (rotate), so that the dipped yarn can be arranged in parallel on the creel in sequence, and a certain distance set between the dipped yarns can be maintained.

[0045] The method for predicting the resin content in the present invention is to cut a section of the dipped yarn after forking, weigh its mass by an electronic balance and then divide the mass by the length to calculate the density of the dipped yarn, and calculate the resin content after being controlled by the resin content control device according to the calculation formula of (dipped yarn density-original yarn density) / dipped yarn density. If the resin content is not within the standard range, adjust the spacing between the pressing rollers in the above manner and repeat the resin content measurement until it meets the standard range.

[0046] Example 2

[0047] This embodiment is a method for preparing a sample of a reinforced fiber dipped yarn, and adopts the quantitative control device in the process of preparing a sample of a reinforced fiber dipped yarn described in Example 1. The method of the present invention specifically includes the following steps:

[0048] Step 1, place the yarn roll or yarn tube wrapped with raw yarn on the raw yarn support roller 6, pull out the raw yarn end from the yarn roll or yarn tube, and make the raw yarn pass through the positioning hole 18, the second dipped yarn channel 22, under the pressure roller 20 in the resin tank 8, between the upper pressure roller 11 and the lower pressure roller 12 and the first dipped yarn channel 14 in sequence and be pulled to the dipped yarn winding frame 5.

[0049] Step 2, mix the resin main agent and the curing agent in a mixing container and inject them into the resin tank 8, so that the crimping roller 20 is completely immersed below the resin liquid surface, and then adjust the temperature in the resin tank 8 to the standard temperature and start timing with a timer.

[0050] Step 3, manually pull the end of the original yarn, pull the dipped yarn to the dipped yarn winding frame 5, adjust the tension controller 2, the original yarn passes through the resin tank 8, and starts to wind until the dipped yarn is wound around the dipped yarn winding frame 5 and then stops winding.

[0051] Step 4, cut a section of dipped yarn and test the resin content in the dipped yarn, and adjust the distance between the upper pressing roller 11 and the lower pressing roller 12 according to the resin content in the dipped yarn obtained by the test until the resin content in the dipped yarn meets the standard requirements, and then formally wind the dipped yarn; in this step, if the tested resin content in the dipped yarn is higher than the amount specified in the standard, the upper pressing roller 11 is adjusted downward so that more resin can be squeezed out of the dipped yarn when passing between the upper pressing roller 11 and the lower pressing roller 12. On the contrary, if the tested resin content in the dipped yarn is lower than the amount specified in the standard, the upper pressing roller 11 should be adjusted upward to reduce the amount of resin squeezed out by the upper pressing roller 11 and the lower pressing roller 12. After multiple adjustments, the measured resin content meets the requirements specified in the standard, and then the formal dipping of the yarn is carried out.

[0052] Step 5: After the dipped yarn winding frame 5 is fully covered with the dipped yarn, the dipped yarn winding frame 5 stops winding and is replaced with a new dipped yarn winding frame 5 to continue winding.

[0053] Step 6, when the time displayed by the timer exceeds the appropriate time that the resin viscosity can be maintained, the sample preparation should be stopped immediately, and a new resin should be replaced, and steps 1 to 5 should be repeated. In the present invention, the appropriate time that the resin viscosity can be maintained is obtained by experimenting before sample preparation to obtain a viscosity-time comparison table. The acquisition of the viscosity-time comparison table is a prior art and will not be described in detail in the present invention.

[0054] Testing the resin content in the dipped yarn in step 4 of the present invention specifically includes the following sub-steps:

[0055] Step 4.1, cut a piece of raw yarn with a length of L1, weigh its mass as M1 on an electronic scale, and calculate the density of the raw yarn ρ1=M1 / L1.

[0056] Step 4.2, cut a length of dipped yarn L2, weigh its mass as M2 on an electronic scale, and calculate the density of the dipped yarn ρ2=M2 / L2.

[0057] Step 4.3, calculate the resin content in the dipped yarn ω2=ρ2-ρ1 / ρ2 and compare it with the resin content specified in the standard.

[0058] Step 4.4: Repeat steps 4.1 to 4.4 until the resin content meets the standard range.

[0059] The parts not specifically described in the above description are all prior art, or can be implemented by prior art. Moreover, the specific implementation cases described in this application are only preferred implementation cases of this application, and are not used to limit the implementation scope of this application. That is, all equivalent changes and modifications made according to the content of the patent scope of this application should be regarded as the technical scope of this application.

Claims

1. A quantitative control device for the sample preparation process of the reinforced fiber dipped yarn, characterized in that: include Rack(1); A tension control device, the tension control device comprising a tension controller (2), a driving device, a magnetic powder clutch (3), a magnetic powder brake (4), a dipped yarn winding frame (5) and an original yarn support roller (6), the driving device being mounted on a frame (1), the input shaft of the magnetic powder clutch (3) being connected to the driving device, the output shaft of the magnetic powder clutch (3) being connected to the dipped yarn winding frame (5), the driving device driving the dipped yarn winding frame (5) to rotate via the magnetic powder clutch (3) so as to wind the dipped yarn onto the dipped yarn winding frame (5), the magnetic powder brake (4) being mounted on the frame (1), one end of the original yarn support roller (6) being connected to the input shaft of the magnetic powder brake (4) for placing a yarn roll or a yarn tube, the magnetic powder clutch (3) and the magnetic powder brake (4) being electrically connected to the tension controller (2); A resin viscosity control device, the resin viscosity control device is arranged between the dipped yarn winding frame (5) and the raw yarn support roller (6), the resin viscosity control device comprises a moving trolley (7), a resin tank (8) and a resin heating tank (9), the resin tank (8) is located in the resin heating tank (9), the resin heating tank (9) is used to heat the resin placed in the resin tank (8), the raw yarn passes through the resin tank (8) for dipped resin, the moving trolley (7) is electrically connected to the tension controller (2) and moves in the length direction of the raw yarn support roller (6) as the dipped yarn is wound on the dipped yarn winding frame (5), a second row of forks (21) is arranged at one end of the resin tank (8) close to the raw yarn support roller (6), a plurality of second dipped yarn channels (22) are opened on the second row of forks (21), and the raw yarn passes through the second dipped yarn channels (22) and is dipped into the resin; A resin content control device comprises a roller frame (10), an upper roller (11), a lower roller (12) and a first row of forks (13), wherein both ends of the upper roller (11) and the lower roller (12) are arranged on the roller frame (10), and the upper roller (11) can move up and down relative to the roller frame (10) to adjust the distance between the upper roller (11) and the lower roller (12), and the first row of forks (13) is arranged on a side close to a dipped yarn winding frame (5), and a plurality of first dipped yarns of different widths are opened on the first row of forks The original yarn is dipped in the resin tank (8), passes between the upper pressure roller (11) and the lower pressure roller (12), and then passes through the first dipped yarn channel (14) to be wound on the dipped yarn winding frame (5). When the original yarn passes through the first dipped yarn channel (14), excess resin is filtered out. The pressure roller frame (10) is arranged on the resin tank (8) near one end of the dipped yarn winding frame (5). The first row of forks (13) is arranged in the resin tank (8) so that the filtered excess resin flows back into the resin tank (8); Electronic balance, used to weigh the mass of the cut length of dipped yarn.

2. The quantitative control device in the sample preparation process of the reinforcing fiber dipped yarn according to claim 1 is characterized in that: The resin heating tank (9) comprises an inner and outer layer, and is connected to one end of a heat transfer oil inlet pipe (15) and a heat transfer oil outlet pipe (16). The heat transfer oil inlet pipe (15) and the heat transfer oil outlet pipe (16) are both connected to an oil temperature circulation control device and are used to flow heat transfer oil into the resin heating tank (9).

3. The quantitative control device in the sample preparation process of the reinforcing fiber dipped yarn according to claim 1 is characterized in that: A positioning frame (17) is arranged between the raw yarn support roller (6) and the resin tank (8). The positioning frame (17) moves synchronously with the movement of the trolley. A positioning hole (18) is provided on the positioning frame (17). The raw yarn passes through the positioning hole (18) and enters the resin tank (8).

4. The quantitative control device in the sample preparation process of the reinforcing fiber dipped yarn according to claim 3 is characterized in that: A support rod (19) is arranged on the movable trolley (7) in the direction of the original yarn support roller (6), and the positioning frame (17) is arranged on the support rod (19).

5. The quantitative control device in the sample preparation process of the reinforcing fiber dipped yarn according to claim 4 is characterized in that: More than two pressing rollers (20) are arranged in the resin tank (8) and are used to press the raw yarn into the resin in the resin tank (8).

6. A method for preparing a sample of a reinforcing fiber dipped yarn, using the quantitative control device in the process of preparing a sample of a reinforcing fiber dipped yarn according to claim 5, characterized in that: The following steps are included: Step 1, pulling out the end of the raw yarn from the yarn roll or yarn tube, and making the raw yarn pass through the positioning hole (18), the second dipped yarn channel (22), the pressure roller (20) in the resin tank (8), the upper pressure roller (11) and the lower pressure roller (12) and the first dipped yarn channel (14) in sequence, and then pulling it to the dipped yarn winding frame (5); Step 2, after mixing the resin main agent and the curing agent evenly, inject them into the resin tank (8), adjust the temperature in the resin tank (8) to the temperature specified by the standard and start timing with a timer; Step 3, manually pulling the end of the original yarn, pulling the dipped yarn after being dipped into the dipped yarn winding frame (5), adjusting the tension controller (2), starting to wind the dipped yarn until it is wound onto the dipped yarn winding frame (5), and then pausing the winding; Step 4, cutting a section of the dipped yarn and testing the resin content in the dipped yarn, and adjusting the distance between the upper pressing roller (11) and the lower pressing roller (12) until the resin content in the dipped yarn meets the standard requirements, and then formally winding the dipped yarn; Step 5, after the dipped yarn winding frame (5) is fully covered with the dipped yarn, the dipped yarn winding frame (5) stops winding, and a new dipped yarn winding frame (5) is replaced to continue winding; Step 6: When the time displayed by the timer exceeds the appropriate time that the resin viscosity can be maintained, the sample preparation should be stopped immediately, and new resin should be replaced, and steps 1 to 5 should be repeated; The resin content in the dipped yarn tested in step 4 includes Step 4.1, cut a length of raw yarn L1, weigh its mass as M1 on an electronic scale, and calculate the density of the raw yarn ρ1=M1 / L1; Step 4.2, cut a length of dipped yarn L2, weigh its mass as M2 on an electronic scale, and calculate the density of the dipped yarn ρ2=M2 / L2; Step 4.3, calculate the resin content in the dipped yarn ω2 = (ρ2-ρ1) / ρ2; Step 4.4: Repeat steps 4.1 to 4.4 until the resin content meets the standard range.

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