A wet winding resin content stability control system and method

Abstract

The application discloses a wet winding resin content stability control system and method, and the system comprises a first yarn buffer mechanism and a second yarn buffer mechanism arranged in sequence along a production direction; the first yarn buffer mechanism comprises a first roller shaft, an elastic tensioning mechanism and a second roller shaft; the first roller shaft rotates at a constant speed, and the second roller shaft rotates at a variable speed; the elastic tensioning mechanism is arranged between the first roller shaft and the second roller shaft and is used for adjusting yarn tension between the first roller shaft and the second roller shaft and buffering and releasing the yarn; the second buffer mechanism comprises a horizontal guide rail, a spring damper, a fixed pulley and a movable pulley; the movable pulley is used for buffering and releasing the yarn through reciprocating movement in the horizontal guide rail. Through the system, the line speed difference between a gum dipping device and a winding head is compensated, the gum dipping speed change caused by the winding speed change in the prior art is solved, the gum dipping speed of the fiber bundle is stabilized, and the quality of a wound product is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fiber winding technology, and particularly relates to a wet winding resin content stability control system and method. BACKGROUND

[0002] In the field of fiber composite material manufacturing, winding process is a widely used forming process, which plays an important role in high-performance structural parts in the fields of aerospace, automobile industry, pipeline transportation, etc. Winding process is mainly divided into dry winding and wet winding. Wet winding is a process engineering that continuous fibers or yarns are directly wound onto a mandrel according to a certain rule after being impregnated with resin glue, and then cured by heating, and then demolded into a composite product. In the wet forming process, the accurate and stable control of resin content is related to the mechanical properties of the product. However, the accurate and stable control of resin content is affected by many factors, for example: (1) the tension change of fiber bundle or yarn bundle leads to uneven impregnation of resin, usually the fiber bundle or yarn bundle is relatively loose when the tension is small, and the resin can easily penetrate the internal fibers or yarns, when the fiber bundle or yarn bundle is tightly pulled, the resin is not easy to penetrate the internal fiber bundle or yarn bundle; (2) the change of winding speed leads to the change of fiber bundle or yarn bundle impregnation time, usually the winding speed of fiber in the barrel section is greater than that in the head section, in the prior art, the impregnation speed and time are affected by the winding speed, the change of impregnation speed and time will cause the resin content of part of the fiber to be too high, that is, during the winding of the barrel section, the fast winding speed will lead to short impregnation time and large tension of the fiber bundle or yarn bundle passing through the impregnation tank, and the resin content is too low; while the winding speed of the head section is slow, which will lead to long impregnation time and small tension of the fiber bundle or yarn bundle passing through the impregnation tank, and the resin content is too high; such unstable resin content will ultimately affect the mechanical properties of the product. Therefore, stable control of fiber impregnation time and winding tension is the key to stable control of resin content in the wet winding process, and is also a problem to be solved. SUMMARY

[0003] In order to solve the problems of uneven resin distribution and unstable resin content in the current wet winding process, the present application aims to provide a wet winding resin content stability control system and method, so that the impregnation speed of the fiber bundle is no longer affected by the winding speed, and remains stable from the beginning to the end of the winding process, and the tension of the fiber bundle or yarn bundle is stable during the impregnation process, thereby ensuring the stability of the final resin content of the composite product.

[0004] In order to achieve the above object, the present application provides a wet winding resin content stability control system, which is arranged between a resin impregnation device and a winding head, and comprises a mounting base, a first yarn buffer mechanism and a second yarn buffer mechanism arranged in sequence along a production direction on the mounting base; the first buffer mechanism comprises a first roller, a second roller and an elastic tensioning mechanism; the first roller is controlled to rotate at a constant speed by a first stepper motor; the second roller is controlled to rotate at variable speed by a second stepper motor; the elastic tensioning mechanism is arranged between the first roller and the second roller, and is used to adjust the yarn tension between the first roller and the second roller, and to buffer and release the yarn; the second yarn buffer mechanism comprises 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 arranged in the horizontal guide rail; the spring damper is fixed and positioned at one end close to the winding head, and is connected to the movable pulley at the other end; and the fixed pulley is arranged away from the movable pulley and close to the winding head.

[0005] In another embodiment, the elastic tensioning mechanism comprises a guide column, an elastic element and a wire guide; the elastic element is arranged on the guide column; and the wire guide is arranged on the guide column and abuts against the upper end of the elastic element, and can move downward to compress the elastic element under stress, or can be reset by the upward elastic force of the elastic element.

[0006] In another embodiment, a spiral wire groove is arranged on the first roller and the second roller; and the fiber bundle or the yarn can be sent to the winding head along the wire groove.

[0007] In another embodiment, a limiting plate and a limiting slot are further arranged on the horizontal guide rail; the limiting plate cooperates with the limiting slot at different positions, and is used to limit the position of the fixed end of the spring damper in the horizontal guide rail, so as to adjust different yarn tensions and the buffer length of the yarn.

[0008] Working principle: the yarn passing through the impregnation device is first sequentially passed through the first roller of the first yarn buffer mechanism, the elastic tensioning mechanism, the second roller, then passed through the fixed pulley and movable pulley of the second yarn buffer mechanism, and finally passed through the winding head to be fixed on the mold core, and the initial winding tension is set. The setting of the winding tension can be determined by selecting the elastic tensioning mechanism and spring damper with appropriate spring coefficient, and selecting the initial position of the spring damper on the horizontal guide rail and other factors. After the winding machine starts winding, when the circumferential winding layer winding is performed, the impregnation speed, the linear speed of the first roller and the linear speed of the second roller are kept consistent with the fiber winding speed of the winding head; when the spiral winding layer winding is performed, the linear speed of the first roller is kept consistent with the linear speed when the circumferential winding layer winding is performed (to keep the impregnation speed unchanged), and the second roller is set to intermittent rotation according to the different winding speeds of the end cap and the barrel. Specifically: within the time required for winding a spiral coil, first run at a linear speed V (greater than the linear speed of the first roller) for a running time T, and the length of the fiber transmitted is the length of a spiral coil; stop rotating for the remaining time, and the linear speed is 0. Within time T, since the linear speed of the first roller is unchanged, the linear speed of the second roller increases, the guide pulley of the elastic tensioning mechanism compresses the elastic element downward to compensate for the speed difference between the first roller and the second roller, and at the same time, since the linear speed of the second roller is greater than the winding speed, the spring damper of the second yarn buffer mechanism resets the movable pulley to slide away from the fixed pulley, compensating for the speed difference between the linear speed of the second roller and the fiber winding speed, and storing the length of the fiber winding required by the mandrel within the time when the linear speed of the second roller is 0; within the time when the linear speed of the second roller is 0, the yarn conveying speed of the first roller is unchanged, the elastic element of the elastic tensioning mechanism starts to stretch upward and reset, and due to the influence of the winding speed, the movable pulley of the second yarn buffer mechanism starts to compress the spring damper, approaches the fixed pulley, and releases the buffered yarn. Thus, the impregnation speed and the yarn tension are stabilized under different winding speeds.

[0009] In a second aspect, the present application also provides a wet winding resin content stability control method, comprising the steps of:

[0010] The impregnation speed is set to be fixed, and when the winding linear speed changes to cause a speed difference with the impregnation speed, the yarn tension is adjusted, and the yarn is buffered or released through the first yarn buffer mechanism and the second yarn buffer mechanism, so as to compensate for the linear speed difference between the impregnation device and the winding head, thereby stabilizing the impregnation speed of the fiber bundle.

[0011] In another embodiment, a wet winding resin content stability control method comprises the steps of:

[0012] The impregnation speed is set to be fixed, and when the winding linear speed changes to cause a speed difference with the impregnation speed, the yarn tension is adjusted, and the yarn is buffered or released through the first yarn buffer mechanism and the second yarn buffer mechanism, so as to compensate for the linear speed difference between the impregnation device and the winding head, thereby stabilizing the impregnation speed of the fiber bundle.

[0013] 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;

[0014] 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.

[0015] ;

[0016] ;

[0017] In the formula:

[0018] L1 is the fiber winding length of a cap section in a helical coil within a certain helical winding layer;

[0019] L2 is the fiber winding length of the cylinder section of a helical coil in a certain helical winding layer;

[0020] V 螺旋-封头 The fiber winding speed of a helical coil end section in a certain helical winding layer;

[0021] 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.

[0022] 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

[0023] Appendix Figure 1 A schematic diagram of the structure of the wet winding resin content stability control system;

[0024] Appendix Figure 2 This is a schematic diagram showing the connection between the wet winding resin content stability control system and the winding machine.

[0025] Appendix Figure 3 This is a schematic diagram of the structure of the first yarn buffer mechanism;

[0026] Figure 1 is a schematic diagram of the structure of the first yarn buffer mechanism. Figure 4 Figure 2 is a schematic diagram of the structure of the second yarn buffer mechanism.

[0027] Figure 3 is a schematic diagram of the structure of the third yarn buffer mechanism. Figure 5 Figure 4 is a resin content graph of the comparative examples and the examples.

[0028] Wherein: 1-first roller shaft; 2-second roller shaft; 3-elastic tensioning mechanism; 31-guide column; 32-spring; 33-wire 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 DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the present application, the following definitions are made:

[0031] Spiral-to-coil: from one end head to the other end head, spirally winding at a certain angle, and the line segment between the winding start point and the winding end point is defined as a spiral-to-coil. A spiral-to-coil is composed of two end head segments and a barrel segment.

[0032] Starting end head: in a spiral-to-coil, the end head as the winding start.

[0033] Ending end head: in a spiral-to-coil, the end head as the winding end.

[0034] A winding yarn layer: from one end of the barrel segment to the other end of the barrel segment, spirally winding around the barrel segment to make the entire barrel segment covered with the spiral-to-coil set of yarns; or reciprocally spirally winding between the two end heads to the spiral-to-coil set of yarns covering the entire length of the core mold.

[0035] Circumferential winding layer: the total winding layer formed by one or more continuous circumferential winding yarn layers.

[0036] Spiral winding layer: the total winding layer formed by one or more continuous spiral-to-coil winding yarn layers.

[0037] Referring to the drawings Figures 1-4The application discloses a wet winding resin content stability control system which is arranged between a resin impregnation device (not shown in the figure) and a winding head 8 and comprises a first yarn buffer mechanism and a second yarn buffer mechanism arranged in sequence along a production direction; the first yarn buffer mechanism comprises a first roller shaft 1, a second roller shaft 2 and an elastic tensioning mechanism 3; the first roller shaft 1 is controlled to rotate at a constant speed by a first stepping motor, and the first stepping motor is controlled in rotation speed by a PLC controller; the second roller shaft 2 is controlled by a second stepping motor, and the second stepping motor is controlled in rotation speed by the PLC controller; the PLC controller is connected with a winding machine controller; the elastic tensioning mechanism 3 is arranged between the first roller shaft 1 and the second roller shaft 2 and used for adjusting yarn tension between the first roller shaft 1 and the second roller shaft 2 and controlling buffering and releasing of a fiber bundle 9; the second yarn buffer mechanism comprises a horizontal guide rail 4, a spring damper 5, a fixed pulley 6 and a movable pulley 7; the horizontal guide rail 4 is arranged horizontally along the production direction; the spring damper 5 and the movable pulley 7 are arranged in the horizontal guide rail 4; the spring damper 5 is fixed and positioned close to one end of the winding head 8 and connected with the movable pulley 7 at the other end; the fixed pulley 6 is arranged close to the winding head 8 and away from the movable pulley 7 and moves horizontally on the horizontal guide rail 4 through the movable pulley 7, thereby controlling yarn tension and buffering and releasing of the fiber bundle 9.

[0038] The spring damper 5 can convert kinetic energy into heat energy through friction or viscous resistance during reciprocating horizontal movement of the movable pulley 7, so that vibration amplitude is weakened and the resin content stability system is kept stable. The spring damper 5 can be selected according to actual conditions to provide stable tension for the system.

[0039] Referring to the accompanying drawings Figure 3 The elastic tensioning mechanism 3 comprises a guide column 31, an elastic component and a wire guide wheel 33; the elastic component is specifically a spring 32; the guide column 31 is perpendicular to the first roller shaft 1 and the second roller shaft 2; the spring 32 is sleeved on the guide column 31; the wire guide wheel 33 is arranged on the guide column 31 and located at the upper end of the spring 32 and can move up and down along the guide column according to force conditions.

[0040] The surfaces of the first roller shaft 1 and the second roller shaft 2 are further provided with spiral wire grooves.

[0041] Referring to the accompanying drawings Figure 4 The horizontal guide rail 4 is further provided with a limiting plate 42 and a plurality of limiting clamping grooves 41; the limiting plate 42 cooperates with the limiting clamping grooves 41 at different positions to realize adjustment of different winding tensions.

[0042] The method for controlling the resin content stability of wet winding is based on the wet winding resin content stability control system, and comprises the following steps: setting a fixed impregnation speed; when the winding speed changes to cause a speed difference with the impregnation speed, adjusting the yarn tension and buffering and releasing the yarn through the first yarn buffering mechanism and the second yarn buffering mechanism, and compensating the speed difference between the impregnation device and the winding head, so that the fiber bundle passes through the impregnation device at a uniform speed.

[0043] In another embodiment, the wet winding resin content stability control method comprises:

[0044] The impregnation speed is set to the fiber winding speed when performing the winding of the hoop winding layer, and the impregnation speed is controlled by setting the linear speed of the first roller;

[0045] When the winding of the hoop winding layer is performed, the linear speed of the first roller and the linear speed of the second roller are consistent with the fiber winding speed;

[0046] When the winding of the spiral winding layer is performed, the linear speed of the first roller is consistent with the linear speed when the winding of the hoop winding layer is performed, and the linear speed of the second roller is variable, specifically: in the time required for winding one spiral winding coil, the second roller first runs at the linear speed V for a running time T; in the remaining time, the second roller stops rotating, and the linear speed is set to 0, wherein:

[0047] ;

[0048] ;

[0049] In the formula:

[0050] L1 is the fiber winding length of a head section in one spiral winding coil in a spiral winding layer;

[0051] L2 is the fiber winding length of a barrel section in one spiral winding coil in a spiral winding layer;

[0052] V 螺旋-封头 is the fiber winding speed of the head section in one spiral winding coil in a spiral winding layer;

[0053] V 螺旋-筒身 is the fiber winding speed of the barrel section in one spiral winding coil in a spiral winding layer.

[0054] In the prior art, for example, a pressure hydrogen storage bottle, usually uses an epoxy resin winding system, according to the grid theory, the relationship between the burst strength and the cylinder radius of the liner can be used to calculate the thickness and winding angle of the composite material layer of the hoop winding layer and the spiral winding layer, and then the hoop winding layer and the spiral winding layer are sequentially distributed according to the design requirements. The diameter of the liner is in the range of 100-500mm, the length of the cylinder is in the range of 200-1000mm, the hoop winding is used as the starting layer on the surface of the liner, and the hoop winding layer is used as the ending layer. The resin content of the fiber winding layer is usually 20-35%, the winding tension is 10-60N, 4-8 strands of fiber are wound, the width of the hoop carbon fiber is controlled in the range of 15-32mm, and the width of the spiral winding carbon fiber is controlled in the range of 14-30mm.

[0055] Example 1

[0056] In this embodiment, the diameter of the liner is 350mm, the length of the cylinder is 450mm, the length of the head is 120mm, the carbon fiber bundle line density used is 1.65g / m, the hoop winding yarn width of 8 strands of carbon fiber bundle is 31mm, the spiral winding yarn width is 29mm, the winding yarn layer thickness is 0.375mm, the fiber winding layer includes 4 hoop winding layers and 3 spiral winding layers alternately wound, each hoop winding layer includes 4 continuous hoop winding yarn layers, and each spiral winding layer includes 8 continuous spiral winding yarn layers. The specific layer design is shown in Table 1.

[0057] Table 1

[0058]

[0059] A wet winding resin content stability control method, comprising the steps of:

[0060] Step one, winding the fiber bundle counterclockwise around the first roller at least one turn, then passing through the guide wheel clockwise, then winding the fiber bundle counterclockwise around the second roller at least one turn, then passing through the fixed pulley, the movable pulley in turn, and finally passing through the winding head and being fixed to the liner; under the condition of meeting the winding tension, the initial position of the guide wheel should make the length of the fiber bundle between the first roller and the second roller tend to be the longest, and the initial position of the movable pulley should make the length of the fiber bundle between the fixed pulley and the movable pulley tend to be the shortest;

[0061] Step two, setting the impregnation speed, taking the fiber winding line speed when performing the hoop winding layer winding as the impregnation speed; the impregnation speed is controlled by setting the line speed of the first roller; that is, the impregnation speed is determined as 0.403m / s;

[0062] When performing the winding of the hoop winding layer, the line speed of the first roller and the line speed of the second roller are consistent with the fiber winding line speed, which is set as 0.403m / s;

[0063] When performing the winding of the spiral winding layer, the linear speed of the first roller shaft is consistent with the linear speed when performing the circumferential winding layer, and the linear speed of the second roller shaft is variable, including: the second roller shaft runs at a linear speed V for a time T required for winding one spiral coil, specifically the time for winding the starting end cap; for the remaining time (the time for winding the barrel section and the ending end cap), the second roller shaft stops rotating, and the linear speed is 0, wherein:

[0064] ;

[0065] ;

[0066] In the formula:

[0067] L1 is the fiber winding length of one end cap section in one spiral coil in a spiral winding layer; in the same spiral coil, the fiber winding lengths of two end cap sections are equal;

[0068] L2 is the fiber winding length of the barrel section in one spiral coil in a spiral winding layer;

[0069] V 螺旋-封头 is the fiber winding speed of the end cap section in one spiral coil in a spiral winding layer.

[0070] In the present embodiment, L1 and L2 in one spiral coil in each spiral winding layer can be calculated according to known parameters. Specifically:

[0071] (1) When performing the first spiral winding layer, the fiber winding length of the barrel section in one spiral coil = barrel length / cos 15° = 450 / cos 15° = 465.87 mm;

[0072] In the same spiral winding layer, the fiber lengths of the end cap sections of the spiral coils located at different winding yarn layers are equal, which can be measured and calculated through modeling, and L1 is 200 mm;

[0073] Therefore,

[0074] ;

[0075] ;

[0076] (2) When performing the second spiral winding layer, the fiber winding length L2 of the barrel section in one spiral coil = barrel length / cos 30° = 450 / cos 30° = 519.62 mm;

[0077] In the same spiral winding layer, the fiber lengths of the end cap sections of the spiral coils located at different winding yarn layers are equal, which can be measured and calculated through modeling, and L1 is 180 mm;

[0078] Therefore,

[0079] ;

[0080] ;

[0081] (3) When performing the third spiral winding layer, one spiral direction coil has a fiber winding length L2 = length of the barrel section / cos 45° = 450 / cos 45° = 636.4 mm;

[0082] In the same spiral winding layer, the fiber length of the head section of the spiral direction coil in different winding yarn layers is equal, which can be measured and calculated by modeling, L1 is 160 mm;

[0083] Therefore,

[0084] ;

[0085] .

[0086] Example 2

[0087] The difference between this embodiment and example 1 is that when performing the winding of the spiral winding layer, the linear speed of the first roller shaft is consistent with the linear speed when performing the hoop winding layer, and the linear speed of the second roller shaft is variable, including: the second roller shaft runs at a linear speed V for a time T required for winding one spiral direction coil, and the specific time is half of the time required for winding one spiral direction coil; the second roller shaft stops rotating for the remaining half of the time, and the linear speed is 0, wherein:

[0088] ;

[0089] ;

[0090] In the formula:

[0091] L1 is the fiber winding length of one head section in one spiral direction coil in a certain spiral winding layer; in the same spiral direction coil, the fiber winding lengths of two head sections are equal;

[0092] L2 is the fiber winding length of the barrel section in one spiral direction coil in a certain spiral winding layer;

[0093] V 螺旋-封头 is the fiber winding speed of the head section of one spiral direction coil in a certain spiral winding layer;

[0094] V 螺旋-筒身 is the fiber winding speed of the barrel section of one spiral direction coil in a certain spiral winding layer.

[0095] In the present embodiment, L1 and L2 in a spiral direction coil in a specific spiral winding layer can be calculated according to the above known parameters. Specifically:

[0096] (1) When the first spiral winding layer is performed, the fiber winding length of the barrel section in a spiral direction coil = barrel length / cos 15° = 450 / cos 15° = 465.87 mm;

[0097] In the same spiral winding layer, the head section fiber length of the spiral direction coil located in different winding yarn layers is equal, which can be measured and calculated by modeling, L1 is 200 mm;

[0098] Therefore,

[0099] ;

[0100] ;

[0101] (2) When the second spiral winding layer is performed, the fiber winding length L1 of the barrel section in a spiral direction coil = barrel length / cos 30° = 450 / cos 30° = 519.62 mm;

[0102] In the same spiral winding layer, the head section fiber length of the spiral direction coil located in different winding yarn layers is equal, which can be measured and calculated by modeling, L1 is 180 mm;

[0103] Therefore,

[0104] ;

[0105] ;

[0106] (3) When the third spiral winding layer is performed, the fiber winding length L2 of the barrel section in a spiral direction coil = barrel length / cos 45° = 450 / cos 45° = 636.4 mm;

[0107] In the same spiral winding layer, the head section fiber length of the spiral direction coil located in different winding yarn layers is equal, which can be measured and calculated by modeling, L1 is 160 mm;

[0108] Therefore,

[0109] ;

[0110] .

[0111] Example 3

[0112] The difference between the embodiment and the embodiment 1 is that when performing the spiral winding layer, the linear speed of the first roller shaft is consistent with the linear speed when performing the annular winding layer, and the linear speed of the second roller shaft is variable, including: the second roller shaft runs at a linear speed V for a time required for winding one spiral coil, and the running time is T (specifically the time required for winding the starting head section and the body section); the second roller shaft stops rotating for the time of winding the terminal head section, and the linear speed is 0, wherein:

[0113] ;

[0114] ;

[0115] In the formula:

[0116] L1 is the fiber winding length of one head section in one spiral coil in a spiral winding layer; in the same spiral coil, the fiber winding lengths of two head sections are equal;

[0117] L2 is the fiber winding length of the body section in one spiral coil in a spiral winding layer;

[0118] V 螺旋-封头 is the fiber winding speed of the head section of one spiral coil in a spiral winding layer;

[0119] V 螺旋-筒身 is the fiber winding speed of the body section of one spiral coil in a spiral winding layer.

[0120] In the embodiment, L1 and L2 in the spiral coil in each spiral winding layer can be calculated according to the above known parameters. Specifically:

[0121] (1) When performing the first spiral winding layer, the fiber winding length L2 of the body section in one spiral coil is equal to the body length / cos 15° = 450 / cos 15° = 465.87 mm;

[0122] In the same spiral winding layer, the fiber lengths of the head sections of the spiral coils located at different winding yarn layers are equal, which can be measured and calculated by modeling, and L1 is 200 mm;

[0123] Therefore,

[0124] ;

[0125] ;

[0126] (2) When performing the second spiral winding layer, the fiber winding length L2 of the body section in one spiral coil is equal to the body length / cos 30° = 450 / cos 30° = 519.62 mm;

[0127] 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.

[0128] therefore,

[0129] ;

[0130] ;

[0131] (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;

[0132] 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.

[0133] therefore,

[0134] ;

[0135] .

[0136] Comparative Example 1

[0137] 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.

[0138] 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.

[0139] Table 2

[0140]

[0141] 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 .

[0142] From Table 2 and Appendix Figure 5It can be seen that, due to the stable impregnation time of the fiber bundle, the fiber bundle resin content is more stable during the alternate winding process of the hoop winding layer and the spiral winding layer in Examples 1-3 compared with the comparative example.

Claims

1. A control system for the stability of resin content in wet-wound winding, characterized in that, The first yarn buffer mechanism and the second yarn buffer mechanism are arranged in sequence along the production direction; the first yarn buffer mechanism comprises 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; the second roller is controlled by a second stepper motor to rotate at a variable speed; the elastic tensioning mechanism is arranged between the first roller and the second roller, and is used for adjusting the yarn tension between the first roller and the second roller, and buffering and releasing the yarn; the second yarn buffer mechanism comprises 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 arranged in the horizontal guide rail; the spring damper is fixed and positioned close to one end of the winding head; the other end of the spring damper is connected to the movable pulley; and the fixed pulley is arranged close to the winding head away from the movable pulley.

2. A wet winding resin content stability control system according to claim 1, characterized by The elastic tensioning mechanism comprises a guide column, an elastic element and a guide wheel; the elastic element is arranged on the guide column; and the guide wheel is arranged on the guide column and located at the upper end of the elastic element; the guide wheel can move up and down along the guide column according to the force condition.

3. A wet winding resin content stability control system according to claim 1, characterized by Spiral guide grooves are arranged on the surfaces of the first roller and the second roller.

4. The wet wrap resin content stability control system of claim 1, wherein, A limiting plate and a plurality of clamping grooves are further arranged on the horizontal guide rail; the limiting plate cooperates with the clamping grooves to limit the position of the fixed end of the spring damper on the horizontal guide rail.

5. A wet winding resin content stability control method based on the control system according to any one of claims 1 to 4, characterized by The method comprises the following steps: A fixed impregnation speed is set; when the speed difference between the impregnation speed and the winding speed is caused by the change of the winding speed, the yarn is buffered or released by the first yarn buffer mechanism and the second yarn buffer mechanism to compensate the speed difference between the impregnation device and the winding head, so as to stabilize the impregnation speed of the fiber bundle.

6. A wet winding resin content stability control method according to claim 5, characterized by The method comprises: The impregnation speed is set as the fiber winding speed when performing the hoop winding layer winding; The impregnation speed is controlled by setting the linear speed of the first roller; When performing the hoop winding layer winding, the linear speed of the first roller and the linear speed of the second roller are consistent with the fiber winding speed; When performing the spiral winding layer winding, the linear speed of the first roller is consistent with the linear speed when performing the hoop winding layer winding, and the linear speed of the second roller is set as a variable speed; specifically, in the time required for winding one spiral coil, the linear speed of the second roller is V first, and the running time is T; in the remaining time, the second roller stops rotating, and the linear speed is set as 0, wherein: ； ； In the formula: L1 is the fiber winding length of a head section in one spiral coil in a certain spiral winding layer; L2 is the fiber winding length of a barrel section in one spiral coil in a certain spiral winding layer; V 螺旋-封头 Vf is the fiber winding speed for a helical coil end segment in a certain helically wound layer; V 螺旋-筒身 is the fiber winding speed of the coil body section for a helical winding layer in a helical direction.

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