Wet winding resin content stability control system and method

Abstract

The invention discloses a wet winding resin content stability control system and method. The system comprises a first yarn temporary storage mechanism and a second yarn temporary storage mechanism which are sequentially arranged in the production direction. The first yarn caching mechanism comprises a first roller shaft, an elastic tensioning mechanism and a second roller shaft; the first roll shaft rotates at a constant speed, and the second roll shaft rotates at a variable speed; the elastic tensioning mechanism is arranged between the first roller shaft and the second roller shaft and used for adjusting the tension of the yarn between the first roller shaft and the second roller shaft and buffering and releasing of the yarn. The second buffering mechanism comprises a horizontal guide rail, a spring damper, a fixed pulley and a movable pulley, and yarn buffering and releasing are conducted through reciprocating motion of the movable pulley in the horizontal guide rail. By means of the system, the linear speed difference between the impregnation device and the winding head is compensated, the problem that in the prior art, the impregnation speed change is caused by the winding speed change is solved, the impregnation speed of fiber bundles is stable, and the quality of wound products is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of fiber winding technology, and specifically to a control system and method for the stability of resin content in wet winding. Background Technology

[0002] In the field of fiber composite material manufacturing, winding process is a widely used molding process, which plays an important role in high-performance structural components in aerospace, automotive industry, pipeline transportation and other fields. The winding process is mainly divided into dry winding and wet winding. Wet winding is a process in which continuous fibers or yarns are impregnated with resin and then wound directly onto the mandrel according to a certain pattern. After heating and curing, the product is demolded to become a composite material product. In the wet molding process, the precise and stable control of resin content is related to the mechanical properties of the product. However, the precise and stable control of resin content is affected by many factors, such as: (1) the change in the tension of the fiber bundle or yarn bundle leads to uneven impregnation in the fiber impregnation process. Usually, the tension of the fiber bundle or yarn bundle is small, and the fibers are relatively loose, so the resin can easily penetrate the internal fibers or yarns. When the tension of the fiber bundle or yarn bundle is large, the fiber bundle or yarn bundle is tightened as a whole, and the resin cannot easily penetrate the inside of the fiber bundle or yarn bundle; (2) the change in winding speed leads to the change in the resin impregnation time of the fiber bundle or yarn bundle. Usually, when spiral winding, the fiber bundle or yarn bundle is not easily impregnated by the resin. The winding speed in the bobbin section is greater than that in the end cap section. In existing technologies, the impregnation speed and time are affected by the winding speed. Variations in impregnation speed and time can lead to excessively high resin content in some fibers. Specifically, during spiral winding, a fast winding speed in the bobbin section results in short impregnation times and high tension for fiber or yarn bundles passing through the impregnation tank during this period, leading to low resin content. Conversely, a slow winding speed in the end cap section results in long impregnation times and low tension for fiber or yarn bundles passing through the impregnation tank during this period, leading to high resin content. This instability in resin content ultimately affects the mechanical properties of the product. Therefore, stably controlling fiber impregnation time and winding tension is crucial for controlling the stability of resin content during wet winding and is a problem that urgently needs to be solved. Summary of the Invention

[0003] To address the issues of uneven resin distribution and unstable resin content in current wet winding processes, this invention aims to provide a control system and method for the stability of resin content in wet winding. This system ensures that the impregnation speed of the fiber bundle is no longer affected by the winding speed throughout the entire winding process, maintaining stability from the start to the end of winding. It also guarantees stable tension of the fiber bundle or yarn bundle during resin impregnation, thereby ensuring the stability of the final resin content in the composite material product.

[0004] To achieve the above objectives, the present invention provides a wet winding resin content stability control system, disposed between the impregnation device and the winding head, including a mounting base and a first yarn buffer mechanism and a second yarn buffer mechanism sequentially disposed on the mounting base along the production direction; the first buffer mechanism includes a first roller, a second roller, and an elastic tensioning mechanism; the first roller is controlled by a first stepper motor to rotate at a constant speed; the second roller is controlled by a second stepper motor to rotate at a variable speed; the elastic tensioning mechanism is disposed between the first roller and the second roller and is used to adjust the yarn tension between the first roller and the second roller, as well as the buffering and release of the yarn; the second yarn buffer mechanism includes a horizontal guide rail, a spring damper, a fixed pulley, and a movable pulley; the horizontal guide rail is horizontally disposed along the production direction; the spring damper and the movable pulley are disposed in the horizontal guide rail; the spring damper is fixed and limited at one end near the winding head, and the other end is connected to the movable pulley; the fixed pulley is disposed away from the movable pulley and close to the winding head.

[0005] In another embodiment, the elastic tensioning mechanism includes a guide post, an elastic element, and a guide wheel; the elastic element is disposed on the guide post; the guide wheel is disposed on the guide post and abuts against the upper end of the elastic element, and can move downward to compress the elastic element after being subjected to force, or be reset by the upward elastic force of the elastic element.

[0006] In another embodiment, the first and second rollers are provided with helical guide grooves. Fiber bundles or yarns can be fed out along the guide grooves towards the winding head.

[0007] In another embodiment, the horizontal guide rail is also provided with a limiting plate and a limiting slot. The limiting plate, in conjunction with the limiting slots at different positions, is used to limit the position of the spring damping fixed end in the horizontal guide rail, thereby adjusting different yarn tensions and the yarn buffer length.

[0008] Working principle: The yarn passing through the impregnation device first passes sequentially through the first roller of the first yarn buffer mechanism, the elastic tensioning mechanism, and the second roller. Then it passes through the fixed pulley and the movable pulley of the second yarn buffer mechanism, and finally passes through the winding head and is fixed on the mold core, with the initial winding tension set. The winding tension can be determined by comprehensively considering factors such as selecting an elastic tensioning mechanism and a spring damper with appropriate spring coefficients, and selecting the initial position of the spring damper on the horizontal guide rail. After the winding machine starts winding, when performing circumferential winding, the impregnation speed, the speed of the first roller axis, the speed of the second roller axis, and the fiber winding speed of the winding head are kept consistent. When performing helical winding, the linear speed of the first roller axis is kept consistent with the linear speed when performing circumferential winding (to keep the impregnation speed constant). The second roller axis is set to rotate intermittently according to the different winding speeds of the end cap and the cylinder. Specifically, in the time required to wind one helical coil, it first runs at a linear speed V (greater than the speed of the first roller axis), the running time is T, and the fiber length transmitted is the fiber length of one helical coil; the remaining time is spent rotating, and the linear speed is 0. Within time T, since the speed of the first roller axis remains constant while the speed of the second roller axis increases, the guide wheel of the elastic tensioning mechanism compresses the elastic element downwards to compensate for the speed difference between the first and second roller axes. Simultaneously, because the speed of the second roller axis is greater than the winding speed, the spring damper of the second yarn buffer mechanism resets, pushing the movable pulley to slide away from the fixed pulley, compensating for the speed difference between the second roller axis speed and the fiber winding speed, and storing the fiber winding length required for the mandrel during the time when the second roller axis speed is 0. During the time when the second roller axis speed is 0, the yarn conveying speed of the first roller axis remains constant, and the elastic element of the elastic tensioning mechanism begins to extend upwards to reset. Influenced by the winding speed, the movable pulley of the second yarn buffer mechanism begins to compress the spring damper, moving closer to the fixed pulley and releasing the buffered yarn. This achieves stable impregnation speed and stable yarn tension under different winding speeds.

[0009] Secondly, the present invention also provides a method for controlling the stability of resin content in wet winding, comprising the following steps: A fixed impregnation speed is set. When the winding speed changes and causes a speed difference with the impregnation speed, the yarn tension is adjusted and the yarn is buffered or released by the first yarn buffer mechanism and the second yarn buffer mechanism to compensate for the speed difference between the impregnation device and the winding head, thereby stabilizing the impregnation speed of the fiber bundle.

[0010] In another embodiment, a method for controlling the stability of wet-wound resin content includes the following steps: The impregnation speed is set to the fiber winding linear speed during the circumferential winding of the winding layer; the impregnation speed is controlled by setting the linear speed of the first roller. When performing circumferential winding, the linear speed of the first roller and the linear speed of the second roller are consistent with the fiber winding linear speed; When performing helical winding, the linear speed of the first roller is consistent with the linear speed during circumferential winding. The linear speed of the second roller is set to variable speed, specifically: during the time required to wind one helical coil, the second roller first runs at a linear speed V for a time T; for the remaining time, the second roller stops rotating, and the linear speed is set to 0. ; ; In the formula: L1 is the fiber winding length of a cap section in a helical coil within a certain helical winding layer; L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer; V 螺旋-封头 The fiber winding speed of a helical coil end section in a certain helical winding layer; V 螺旋-筒身 The fiber winding speed is the speed at which a coil section in a spiral winding layer winds the fiber.

[0011] The beneficial effects of this invention are as follows: By introducing a resin content stability control system between the impregnation device and the winding head, the uniform motion required for fiber impregnation with resin and the variable speed motion of the winding head are separated. Under the premise of ensuring variable speed winding, the fiber bundle passes through the impregnation device at a uniform speed, ensuring a sufficiently stable impregnation time, accurately controlling the fiber impregnation time, and improving the quality of the wound product. At the same time, through the synergistic effect of the tensioning device and the second yarn buffer mechanism, the tension of the fiber bundle is stabilized, which further ensures the stability of fiber impregnation with resin and improves the quality of the wound product. Attached Figure Description

[0012] Appendix Figure 1 A schematic diagram of the structure of the wet winding resin content stability control system; Appendix Figure 2 This is a schematic diagram showing the connection between the wet winding resin content stability control system and the winding machine. Appendix Figure 3 This is a schematic diagram of the structure of the first yarn buffer mechanism; Appendix Figure 4 This is a schematic diagram of the second yarn buffer mechanism; Appendix Figure 5 A line graph showing the resin content of the comparative example and the embodiment; Wherein: 1-First roller shaft; 2-Second roller shaft; 3-Elastic tensioning mechanism; 31-Guide post; 32-Spring; 33-Guide wheel; 4-Horizontal guide rail; 41-Limiting slot; 42-Limiting plate; 5-Spring damper; 6-Fixed pulley; 7-Moving pulley; 8-Winding head; 9-Fiber bundle. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] In this invention, the following definitions apply: Helical coil: Starting from one end cap and spirally wound at a certain angle to the other end cap, the line segment between the starting point and the ending point of the winding is defined as a helical coil. A helical coil consists of two end cap segments and one body segment.

[0015] Starting end cap: In a helical coil, the end cap that serves as the starting point for winding.

[0016] End cap: In a helical coil, the end cap serves as the end of the winding.

[0017] A winding yarn layer: a circumferential coil of yarn that is wound from one end of the bobbin section to the other end, so that the entire bobbin section is covered with a circumferential coil of yarn; or a spiral coil of yarn that is wound back and forth between two end caps until the yarn covers the entire length of the mandrel.

[0018] Circular winding layer: The total winding layer formed by stacking one or more consecutive circular winding yarn layers.

[0019] Spiral winding layer: The total winding layer formed by the superposition of one or more continuous spiral winding yarn layers.

[0020] See appendix Figure 1-4A wet winding resin content stability control system is installed between the impregnation device (not shown) and the winding head 8, including a first yarn buffer mechanism and a second yarn buffer mechanism arranged sequentially along the production direction; the first yarn buffer mechanism includes a first roller 1, a second roller 2, and an elastic tensioning mechanism 3. The first roller 1 is controlled by a first stepper motor to rotate at a constant speed, and the speed of the first stepper motor is controlled by a PLC controller; the second roller 2 is controlled by a second stepper motor, and the speed of the second stepper motor is controlled by a PLC controller; the PLC controller is connected to the winding machine controller; the elastic tensioning mechanism 3 is installed between the first and second rollers. Between the first roller 1 and the second roller 2, the yarn tension between the first roller 1 and the second roller 2 is adjusted, and the buffering and release of the fiber bundle 9 is controlled. The second yarn buffering mechanism includes a horizontal guide rail 4, a spring damper 5, a fixed pulley 6, and a movable pulley 7. The horizontal guide rail 4 is set horizontally along the production direction. The spring damper 5 and the movable pulley 7 are set in the horizontal guide rail 4. The spring damper 5 is fixed and limited at one end near the winding head 8, and the other end is connected to the movable pulley 7. The fixed pulley 6 is set away from the movable pulley 7 and close to the winding head 8. The yarn tension and the buffering and release of the fiber bundle 9 are controlled by the horizontal movement of the movable pulley 7 on the horizontal guide rail 4.

[0021] The spring damper 5 converts kinetic energy into heat energy through friction or viscous resistance during the reciprocating horizontal movement of the movable pulley 7, thereby reducing the vibration amplitude and maintaining the stability of the resin content stability system. The spring damper 5 can be selected with a spring coefficient according to actual conditions to provide stable tension for the system.

[0022] See appendix Figure 3 The elastic tensioning mechanism 3 includes a guide post 31, an elastic component, and a guide wheel 33. The elastic component is specifically a spring 32. The guide post 31 is perpendicular to the first roller shaft 1 and the second roller shaft 2. The spring 32 is sleeved on the guide post 31. The guide wheel 33 is set on the guide post 31, located at the upper end of the spring 32, and can move up and down along the guide post according to the force.

[0023] The surfaces of the first roller 1 and the second roller 2 are also provided with spiral guide grooves.

[0024] See appendix Figure 4 The horizontal guide rail 4 is also provided with a limiting plate 42 and several limiting slots 41. The limiting plate 42, in conjunction with the limiting slots 41 at different positions, can realize the adjustment of different winding tensions.

[0025] A method for controlling the stability of resin content in wet winding, based on the aforementioned wet winding resin content stability control system, includes the following steps: setting a fixed impregnation speed; when a change in winding speed causes a speed difference with the impregnation speed, adjusting the yarn tension and buffering and releasing the yarn through a first yarn buffer mechanism and a second yarn buffer mechanism to compensate for the speed difference between the impregnation device and the winding head, thereby ensuring that the fiber bundle passes through the impregnation device at a uniform speed.

[0026] In another embodiment, the method for controlling the stability of the wet-wound resin content includes: The impregnation speed is set to the fiber winding speed during the circumferential winding of the winding layer; the impregnation speed is controlled by setting the linear speed of the first roller. When performing circumferential winding of the winding layer, the linear velocity of the first roller and the linear velocity of the second roller are kept consistent with the fiber winding speed; When performing helical winding, the linear speed of the first roller is consistent with that when performing circumferential winding. The linear speed of the second roller is variable. Specifically, during the time required to wind one helical coil, the second roller first runs at a linear speed V for a time T; for the remaining time, the second roller stops rotating, and the linear speed is set to 0. ; ; In the formula: L1 is the fiber winding length of a cap section in a helical coil within a certain helical winding layer; L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer; V 螺旋-封头 The fiber winding speed of a helical coil end section in a certain helical winding layer; V 螺旋-筒身 The fiber winding speed is the speed at which a coil section in a spiral winding layer winds the fiber.

[0027] In existing technologies, taking pressurized hydrogen storage cylinders as an example, epoxy resin winding systems are typically used. Based on grid theory, the thickness and winding angle of the circumferential and helical winding layers of the composite material can be calculated by considering the relationship between the design burst strength and the radius of the inner liner. Then, the circumferential and helical winding layers are sequentially distributed according to design requirements. The inner liner diameter ranges from 100-500mm, and the cylinder length is 200-1000mm. Circumferential winding is used as the starting layer and the ending layer on its surface. Typically, the resin content of the fiber winding layer is 20-35%, the winding tension is 10-60N, and 4-8 strands of fiber are used. The width of the circumferential carbon fiber is controlled within the range of 15-32mm, and the width of the helical carbon fiber is controlled within the range of 14-30mm.

[0028] Example 1

[0029] In this embodiment, the inner liner diameter is 350mm, the cylinder length is 450mm, the end cap length is 120mm, the carbon fiber bundle linear density is 1.65g / m, the 8-strand carbon fiber bundle is wound with a circumferential yarn width of 31mm and a spiral winding yarn width of 29mm, the winding yarn layer thickness is 0.375mm, the fiber winding layer consists of 4 circumferential winding layers and 3 spiral winding layers wound alternately, each circumferential winding layer consists of 4 consecutive circumferential winding yarn layers, and each spiral winding layer consists of 8 consecutive spiral winding yarn layers. For the specific layering design, please refer to Table 1.

[0030] Table 1

[0031] A method for controlling the stability of resin content in wet-process winding includes the following steps: Step 1: Wind the fiber bundle counterclockwise around the first roller shaft at least once, then pass it clockwise through the guide wheel, then wind it counterclockwise around the second roller shaft at least once, then pass it through the fixed pulley and the movable pulley in sequence, and finally pass it through the winding head and fix it to the inner liner; Under the condition of satisfying the winding tension, the initial position of the guide wheel should make the fiber bundle length between the first roller shaft and the second roller shaft tend to be the longest, and the initial position of the movable pulley should make the fiber bundle length between the fixed pulley and the movable pulley tend to be the shortest; Step 2: Set the impregnation speed, using the fiber winding linear speed during the circumferential winding of the winding layer as the impregnation speed; the impregnation speed is controlled by setting the linear speed of the first roller; that is, the impregnation speed is determined to be 0.403 m / s; When performing circumferential winding of the winding layer, the linear velocity of the first roller and the linear velocity of the second roller are consistent with the fiber winding linear velocity, which is set to 0.403 m / s; When performing the spiral winding layer, the linear velocity of the first roller is consistent with the linear velocity when performing the circumferential winding layer. The linear velocity of the second roller is variable, including: during the time required to wind one spiral coil, the second roller first runs at a linear velocity V for a running time T, specifically the time for winding the starting end cap; during the remaining time (the time for winding the cylinder body and the ending end cap), the second roller stops rotating, and the linear velocity is 0, where: ; ; In the formula: L1 is the fiber winding length of a head segment in a helical coil within a certain helical winding layer; in the same helical coil, the fiber winding lengths of two head segments are equal; L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer; V 螺旋-封头 This refers to the fiber winding speed of a helical coil end cap segment within a specific helical winding layer.

[0032] In this embodiment, L1 and L2 in a specific helical coil within each helical winding layer can be calculated based on known parameters. Specifically: (1) When the first spiral winding layer is executed, the fiber winding length of the bobbin section in a spiral coil = bobbin length / cos15° = 450 / cos15° = 465.87 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal, which can be calculated by modeling. L1 is 200mm. therefore, ; ; (2) When the second spiral winding layer is executed, the fiber winding length L2 of the cylinder section in a spiral coil is L2 = cylinder length / cos30° = 450 / cos30° = 519.62 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal. It can be calculated by modeling that L1 is 180mm. therefore, ; ; (3) When the third spiral winding layer is executed, the fiber winding length L2 of the bobbin section in a spiral coil is L2 = bobbin length / cos45° = 450 / cos45° = 636.4 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal. It can be calculated by modeling that L1 is 160mm. therefore, ; .

[0033] Example 2 The difference between this embodiment and Embodiment 1 is that when performing the spiral winding layer, the linear velocity of the first roller is consistent with the linear velocity when performing the circumferential winding layer, while the linear velocity of the second roller is variable, including: during the time required to wind one spiral coil, the second roller first runs at a linear velocity V for a running time T, specifically half the time required to wind one spiral coil; for the remaining half of the time, the second roller stops rotating, and the linear velocity is 0, wherein: ; ; In the formula: L1 is the fiber winding length of a head segment in a helical coil within a certain helical winding layer; in the same helical coil, the fiber winding lengths of two head segments are equal; L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer; V 螺旋-封头 The fiber winding speed of a helical coil end section in a certain helical winding layer; V 螺旋-筒身 The fiber winding speed is the speed at which a coil section in a spiral winding layer winds the fiber.

[0034] In this embodiment, based on the known parameters above, L1 and L2 in a specific helical coil within a particular helical winding layer can be calculated. Specifically: (1) When the first spiral winding layer is executed, the fiber winding length of the bobbin section in a spiral coil = bobbin length / cos15° = 450 / cos15° = 465.87 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal, which can be calculated by modeling. L1 is 200mm. therefore, ; ; (2) When the second spiral winding layer is executed, the fiber winding length L1 of the cylinder section in a spiral coil is L1 = cylinder length / cos30° = 450 / cos30° = 519.62 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal. It can be calculated by modeling that L1 is 180mm. therefore, ; ; (3) When the third spiral winding layer is executed, the fiber winding length L2 of the bobbin section in a spiral coil is L2 = bobbin length / cos45° = 450 / cos45° = 636.4 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal. It can be calculated by modeling that L1 is 160mm. therefore, ; .

[0035] Example 3 The difference between this embodiment and Embodiment 1 is that when performing the spiral winding layer, the linear velocity of the first roller is consistent with the linear velocity when performing the circumferential winding layer, while the linear velocity of the second roller is variable, including: during the time required to wind one spiral coil, the second roller first runs at a linear velocity V for a running time of T (specifically, the time required to wind the initial end cap section and the cylinder body section); during the time required for the final end cap section of the winding, the second roller stops rotating, and the linear velocity is 0, wherein: ; ; In the formula: L1 is the fiber winding length of a head segment in a helical coil within a certain helical winding layer; in the same helical coil, the fiber winding lengths of two head segments are equal; L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer; V 螺旋-封头 The fiber winding speed of a helical coil end section within a specific helical winding layer; V 螺旋-筒身 The fiber winding speed is the speed at which a coil section in a spiral winding layer winds the fiber.

[0036] In this embodiment, based on the known parameters above, L1 and L2 in the helical coil of each specific helical winding layer can be calculated. Specifically: (1) When the first spiral winding layer is executed, the fiber winding length L2 of the cylinder section in a spiral coil is L2 = cylinder length / cos15° = 450 / cos15° = 465.87 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal, which can be calculated by modeling. L1 is 200mm. therefore, ; ; (2) When the second spiral winding layer is executed, the fiber winding length L2 of the cylinder section in a spiral coil is L2 = cylinder length / cos30° = 450 / cos30° = 519.62 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal. It can be calculated by modeling that L1 is 180mm. therefore, ; ; (3) When the third spiral winding layer is executed, the fiber winding length L2 of the bobbin section in a spiral coil is L2 = bobbin length / cos45° = 450 / cos45° = 636.4 mm; In the same spiral winding layer, the fiber length of the end section of the spiral coil in different winding yarn layers is equal. It can be calculated by modeling that L1 is 160mm. therefore, ; .

[0037] Comparative Example 1 Compared with Examples 1-3, this comparative example does not use the control system and control method of the present invention. The speed at which the fiber bundle passes through the impregnation device is consistent with the winding speed, and is variable speed.

[0038] In Examples 1-3, random samples were taken from the impregnated fiber bundles between the movable pulley and the mandrel. The sample length was 200 mm. Five segments each of the circumferential winding and helical winding stages were performed, and the samples were sequentially numbered. In Comparative Example 1, random samples were taken from the fiber bundles between the impregnation device and the mandrel. Similarly, the sample length was 200 mm, and five segments each of the circumferential winding and helical winding stages were performed. The samples were sequentially numbered. The weight of each sample was recorded, and the resin content was calculated. See Table 2 for detailed data.

[0039] Table 2

[0040] A line graph of resin content was plotted based on the resin content of the comparative examples and various embodiments. See the appendix for details. Figure 5 .

[0041] From Table 2 and Appendix Figure 5 It can be seen that, due to the stable impregnation time of the fiber bundles, the resin content of the fiber bundles is more stable in Examples 1-3 compared to the comparative examples during the alternating winding of the circumferential and helical winding layers.

Claims

1. A control system for the stability of resin content in wet-wound winding, characterized in that, The system includes a first yarn buffer mechanism and a second yarn buffer mechanism arranged sequentially along the production direction. The first yarn buffer mechanism includes a first roller, an elastic tensioning mechanism, and a second roller. The first roller is controlled by a first stepper motor to rotate at a constant speed, while the second roller is controlled by a second stepper motor to rotate at a variable speed. The elastic tensioning mechanism is located between the first and second rollers and is used to adjust the yarn tension between the first and second rollers, as well as to buffer and release the yarn. The second yarn buffer mechanism includes a horizontal guide rail, a spring damper, a fixed pulley, and a movable pulley. The horizontal guide rail is arranged horizontally along the production direction. The spring damper and the movable pulley are located within the horizontal guide rail. The spring damper is fixed and limited at one end near the winding head, and the other end is connected to the movable pulley. The fixed pulley is located away from the movable pulley and close to the winding head.

2. The wet-winding resin content stability control system according to claim 1, characterized in that, The elastic tensioning mechanism includes a guide post, an elastic element, and a guide wheel. The elastic element is mounted on the guide post, and the guide wheel is mounted on the guide post at the upper end of the elastic element. The guide wheel can move up and down along the guide post according to the force applied.

3. The wet-winding resin content stability control system according to claim 1, characterized in that, The surfaces of the first roller and the second roller are provided with spiral guide grooves.

4. The wet-winding resin content stability control system according to claim 1, characterized in that, The horizontal guide rail is also provided with a limiting plate and several slots. The limiting plate, together with the slots, restricts the position of the fixed end of the spring damper on the horizontal guide rail.

5. A method for controlling the stability of resin content in wet-process winding, based on the control system described in any one of claims 1-4, characterized in that... Including the following steps: A fixed impregnation speed is set. When the winding speed changes and causes a speed difference with the impregnation speed, the yarn is buffered or released by the first yarn buffer mechanism and the second yarn buffer mechanism to compensate for the speed difference between the impregnation device and the winding head, thereby stabilizing the impregnation speed of the fiber bundle.

6. The method for controlling the stability of resin content in wet winding according to claim 5, characterized in that... include: Set the impregnation speed to the fiber winding linear speed during the circumferential winding of the winding layer; The impregnation speed is controlled by setting the linear speed of the first roller. When performing circumferential winding, the linear speed of the first roller and the linear speed of the second roller are consistent with the fiber winding linear speed; When performing helical winding, the linear speed of the first roller is consistent with the linear speed during circumferential winding. The linear speed of the second roller is set to variable speed, specifically: during the time required to wind one helical coil, the second roller initially operates at a linear speed V for a time T; for the remaining time, the second roller stops rotating, and the linear speed is set to 0. ； ； In the formula: L1 is the fiber winding length of a cap section in a helical coil within a certain helical winding layer; L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer; V 螺旋-封头 The fiber winding speed of a helical coil end section in a certain helical winding layer; V 螺旋-筒身 The fiber winding speed is the speed at which a coil section in a spiral winding layer winds the fiber.

Images