Preparation device of novel high-strength FRP tube core for electrolytic copper foil
By employing a combination design of a 30° tilted winding head and a mesh fiber layer in the fabrication of FRP cores, the problem of interlayer stress concentration was solved, enabling the fabrication of high-strength and lightweight FRP cores and reducing equipment load and transportation costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GANSU DEFU NEW MATERIALS CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-19
AI Technical Summary
Existing FRP cores suffer from interlayer stress concentration during the manufacturing process, leading to cracking. Furthermore, simply increasing the number of winding layers increases the core weight, transportation costs, and equipment load.
The winding head with a 30° tilt angle and the addition of a mesh fiber layer on the outside of the layer form a positive interlocking interface. Combined with the design of the guide group and the impregnation tank, closed-loop control of the fiber path and tension gradient regulation are achieved, ensuring uniform fiber arrangement and control of adhesive thickness.
While reducing the weight of the die, it significantly improves the radial compressive strength and interlaminar shear strength, achieving the fabrication of high-strength and lightweight FRP dies, reducing equipment load and transportation costs.
Smart Images
Figure CN224256130U_ABST
Abstract
Description
Technical Field
[0001] This utility model mainly relates to the field of FRP core processing technology, specifically a device for preparing a new type of high-strength FRP core for electrolytic copper foil. Background Technology
[0002] FRP cores are tubular cores made primarily of fiber-reinforced polymer / plastic (FRP) composite material. They are mainly used in electrolytic copper foil slitting, winding, transportation, and storage as a rigid support for copper foil rolls.
[0003] The main function of FRP core fabrication equipment is to composite fiber-reinforced materials and resin matrices into tubular structures through a specific process. Fiber bundles are wound onto a mandrel at specific angles, and resin is coated simultaneously, with layers stacked to form the core. Existing technologies primarily improve isotropy by adjusting the fiber winding angles (±45° alternately), but this does not solve the problem of interlayer stress concentration. Specifically, this manifests as insufficient bonding between the fiber and resin interface, and the difference in thermal expansion coefficients between the fiber and resin leading to internal stress after curing. Under long-term loads or changes in ambient temperature, this easily causes interlayer cracking. Furthermore, while simply increasing the number of winding layers can improve strength, it also linearly increases the core weight, further increasing transportation costs in electrolytic copper foil production, increasing energy consumption due to heavier equipment loads, and exacerbating mechanical wear on the winding mechanism due to excessive load. It is difficult to simultaneously meet the requirements of high strength and lightweight design. Utility Model Content
[0004] This utility model addresses the problem that existing technical solutions are too simplistic by providing a novel high-strength FRP die preparation device for electrolytic copper foil. This device solves the unresolved interlayer stress concentration problem mentioned in the background section, and also addresses the technical problem that simply increasing the number of winding layers linearly increases the die weight.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:
[0006] A device for preparing a novel high-strength FRP core for electrolytic copper foil includes a steel core mold, a layup device positioned directly above the steel core mold, a mesh fiber layer sleeved on the outside of the layup device, a winding machine moving frame slidably connected to one side of the steel core mold and the layup device, a drive mechanism for reciprocating movement of the winding machine moving frame positioned below the winding machine moving frame, winding heads rotatably connected to one side of the outer wall of the winding machine moving frame at a 30° angle, an impregnation tank fixedly connected to the other side of the outer wall of the winding machine moving frame, guide groups rotatably connected above the winding heads and above the impregnation tank, and pressure blocks for axially fixing the fiber layer sleeved at both ends of the outer wall of the steel core mold.
[0007] Furthermore, the steel core mold, the layup device, the reciprocating screw, and the winding machine moving frame are all integrated into one unit by the frame. The frame is provided with connecting ends at both ends of the corresponding steel core mold and the layup device. Flanges are fixedly installed at the connecting ends. Both ends of the steel core mold and the layup device are provided with flanges of the same specification, and are fixedly connected to the flanges at the connecting ends of the frame by flange bolts.
[0008] Furthermore, a recycling tray is provided below the steel core mold, and a drive mechanism that is rotatably connected to the frame is provided below the recycling tray. The drive mechanism includes a reciprocating screw driven by a servo motor, and one end of the bottom of the winding machine moving frame is sleeved on the outer wall of the reciprocating screw, forming a helical transmission structure with it.
[0009] Furthermore, the winding machine moving frame is equipped with a drive mechanism on one side of the corresponding winding head, and the winding head is located below the steel mandrel. Multiple rollers are rotatably connected to the surface of the winding head, and the multiple rollers are staggered and spaced along the surface of the winding head.
[0010] Furthermore, a first guide group is provided above the winding head. The first guide group includes three rollers arranged in a triangle. The winding machine moving frame is provided with a slot for rotating and connecting a steering roller above the corresponding first guide group. The steering roller is located above the first guide group and the second guide group.
[0011] Furthermore, a second guide group is provided above the impregnation tank. The second guide group includes two rotatably connected rollers, and a hydraulic rod is rotatably connected to the outer wall of the winding machine moving frame at the position corresponding to the second guide group. The power output end of the hydraulic rod is rotatably connected to the upper roller in the second guide group.
[0012] Furthermore, the dip tank is equipped with a coating roller inside, and the coating roller is rotatably connected to the inside of the dip tank through a drive mechanism located outside the dip tank. A limit rod is rotatably connected above the coating roller in the dip tank. The limit rod is attached to the top of the coating roller and forms a relative rotational motion with it. Two guide rods are rotatably connected to one side of the outer wall of the dip tank, which are distributed vertically and horizontally.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0014] 1. By adding a 30° obliquely cross-laid grid fiber layer to the outside of the layer, forming a positive interlocking interface with the wound linear fiber layer, the defects of the traditional unidirectional fiber arrangement are changed. Under the same strength, the grid layer + linear layer composite structure can reduce the core wall thickness and reduce the weight of a single core, while improving the radial compression strength, thus achieving high-strength and lightweight core preparation.
[0015] 2. The winding head adopts a 30° tilt angle design, which, compared with the traditional ±45° winding method, allows the fibers to distribute stress more reasonably when the product is under force, effectively improving the radial compressive strength and interlaminar shear strength of the product. The first guide group, the second guide group, the turning roller and the guide ring constitute a closed-loop control system for the fiber path, realizing the spatial synchronous convergence of multiple fibers and the tension gradient control, ensuring uniform fiber arrangement.
[0016] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the steel core mold and pressure block structure of this utility model;
[0019] Figure 3 This is a partial structural diagram of the winding head of this utility model;
[0020] Figure 4 This is a schematic diagram of the impregnation tank structure of this utility model.
[0021] Numbering on the map:
[0022] 1. Steel mandrel; 2. Laying device; 3. Recycling tray; 4. Reciprocating screw; 5. Winding machine moving frame; 6. Winding head; 7. First guide group; 8. Glue impregnation tank; 801. Glue coating roller; 802. Limiting rod; 803. Guide rod; 9. Second guide group; 10. Turning roller; 11. Pressure block. Detailed Implementation
[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.
[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0025] Please refer to the appendix carefully. Figure 1-4A device for preparing a novel high-strength FRP core for electrolytic copper foil includes a steel core mold 1, a layup device 2 located directly above the steel core mold 1, a mesh fiber layer sleeved on the outside of the layup device 2, a winding machine moving frame 5 slidably connected to one side of the steel core mold 1 and the layup device 2, a drive mechanism for driving the winding machine moving frame 5 to reciprocate below the winding machine moving frame 5, a winding head 6 rotatably connected to one side of the outer wall of the winding machine moving frame 5 at a 30° inclined angle, a glue-impregnating tank 8 fixedly connected to the other side of the outer wall of the winding machine moving frame 5, guide groups rotatably connected above the winding head 6 and above the glue-impregnating tank 8, and pressure blocks 11 for axially fixing the fiber layer sleeved at both ends of the outer wall of the steel core mold 1.
[0026] With the above structure, compared with the traditional single alternating wound linear fiber, by adding a grid fiber layer to the outside of the layup device 2, which itself is a spatial grid structure formed by 30° oblique cross-layup, and then forming a positive interlocking interface with the wound linear fiber layer, the defects of unidirectional fiber arrangement are completely changed. Under the same strength, the grid layer + linear layer composite structure can reduce the core wall thickness, thereby reducing the weight of a single core, while increasing the radial compressive strength, ultimately achieving a high-strength and lightweight core.
[0027] In this embodiment, as Figure 1 and Figure 2 As shown, the steel mandrel 1, the layup device 2, the reciprocating screw 4, and the winding machine moving frame 5 are all integrated into one unit by the frame. The frame is provided with connecting ends at both ends of the corresponding steel mandrel 1 and layup device 2. Flanges are fixedly installed at the connecting ends, and both ends of the steel mandrel 1 and layup device 2 are provided with flanges of the same specification. The flanges at both ends are fixedly connected to the flanges at the connecting ends of the frame by flange bolts.
[0028] With the above structure, the frame serves as a rigid base, integrating key components such as the steel core mold 1 and the layup device 2 into a unified force-bearing unit. This improves the overall bending stiffness of the equipment, enabling it to withstand radial loads of ≥50kN. It avoids vibration or displacement caused by connection gaps in traditional split structures. The steel core mold 1 and the layup device 2 can be quickly disassembled using flange bolts, allowing for rapid replacement of the external laying materials.
[0029] In this embodiment, as Figure 1 and Figure 2 As shown, a recycling tray 3 is provided below the steel core mold 1, and a drive mechanism that is rotatably connected to the frame is provided below the recycling tray 3. The drive mechanism includes a reciprocating screw 4, and one end of the bottom of the winding machine moving frame 5 is sleeved on the outer wall of the reciprocating screw 4, forming a spiral transmission structure with it. The top of the winding machine moving frame 5 is slidably connected to the slide rod of the frame through a slider, while the bottom of the winding machine moving frame 5 is slidably connected to the corresponding slide grooves opened on both sides of the frame.
[0030] With the above structure, the winding machine moving frame 5 achieves linear reciprocating motion through the reciprocating screw 4, ensuring that the winding head 6 moves along the axial direction of the steel mandrel 1, and realizing the equidistant spiral laying of linear fiber bundles on the surface of the steel mandrel 1.
[0031] In this embodiment, as Figure 3 As shown, the winding machine moving frame 5 is equipped with a drive mechanism on one side of the corresponding winding head 6, and the winding head 6 is located below one side of the steel core mold 1. Multiple rollers are rotatably connected to the surface of the winding head 6, and the multiple rollers are distributed alternately along the surface of the winding head 6.
[0032] The unique design of the winding head 6, positioned at a 30° angle below one side of the steel mandrel 1, improves isotropy in the plane compared to traditional ±45° alternating winding. However, the fibers are arranged linearly in one direction, and the layers are only bonded by resin, resulting in insufficient interfacial bonding and differences in thermal expansion coefficients. This leads to transverse shear stress after curing, which can easily cause interlayer peeling or cracking under long-term load or temperature changes. Furthermore, simply increasing the number of winding layers to improve strength also linearly increases the weight of the core, leading to a heavier load on the electrolytic copper foil winding equipment and increased transportation costs. The 30° angled winding of the linear fibers... The combination of bundles and 30° diagonally cross-laid mesh fiber layers locks the fibers together in space, transforming the traditional two-dimensional planar stress into a three-dimensional stress network. This effectively suppresses interlaminar slip and cracking. Furthermore, while traditional single fiber layers require increased thickness to improve strength, this composite structure of mesh and linear layers can achieve the same strength with a thinner thickness, resulting in significant weight reduction. Compared to the traditional ±45° winding method, the 30° winding angle allows the fibers to distribute stress more rationally when the product is under stress, effectively improving the radial compressive strength and interlaminar shear strength of the product.
[0033] In this embodiment, as Figure 3 and Figure 4 As shown, a first guide group 7 is provided above the winding head 6. The first guide group 7 includes three rollers arranged in a triangle. The winding machine moving frame 5 has a slot for rotating and connecting the steering roller 10 through the top of the first guide group 7. The steering roller 10 is located above the first guide group 7 and the second guide group 9. A guide ring is provided above the second guide group 9, which can converge multiple dispersed linear fiber bundles into a single beam and then transport it to the other side of the winding machine moving frame 5 through the steering roller 10. This realizes the spatial synchronous convergence of multiple fibers. Combined with gradient control of different tensions, a complete closed-loop control system for fiber path is formed.
[0034] In this embodiment, as Figure 3 and Figure 4As shown, a second guide group 9 is provided above the impregnation tank 8. The second guide group 9 includes two rotatably connected rollers, and a hydraulic rod is rotatably connected to the outer wall of the winding machine moving frame 5 corresponding to the position of the second guide group 9. The power output end of the hydraulic rod is rotatably connected to the upper roller in the second guide group 9. The roller rotatably connected to the lower part of the second guide group 9 is in a fixed position, while the upper roller connected to the hydraulic rod above it can be height adjusted, thereby adjusting the distance between it and the lower roller in a fixed position below it.
[0035] With the above structure, the tension of the linear fiber as it passes through the second guide group 9 can be precisely controlled by adjusting the distance between the upper and lower rollers using a hydraulic rod. When it is necessary to increase the fiber tension, the distance between the two rollers can be reduced, so that the fiber is subjected to greater compression and friction, thereby tightening the fiber. Conversely, increasing the distance can reduce the tension. This helps to ensure that the fiber maintains a suitable tension throughout the winding process and avoids problems such as loose winding and interlayer slippage caused by uneven tension.
[0036] In this embodiment, as Figure 4 As shown, a coating roller 801 is installed inside the dipping tank 8, and the coating roller 801 is rotatably connected to the inside of the dipping tank 8 through a drive mechanism installed outside the dipping tank 8. A limiting rod 802 is rotatably connected above the coating roller 801 in the dipping tank 8. The limiting rod 802 is attached to the top of the coating roller 801 and forms a relative rotational motion with it. Two guide rods 803 are rotatably connected to one side of the outer wall of the dipping tank 8. A slot for inserting the limiting rod 802 is provided at the top of the dipping tank 8. After the limiting rod 802 is inserted, its bottom is attached to the top of the coating roller 801. The coating roller 801 rotates due to the drive structure, thereby realizing the relative movement of the limiting rod 802.
[0037] With the above structure, the impregnation tank 8 is filled with resin glue, and the coating roller 801 rotates under the drive of the external drive mechanism, so that the linear fibers can be evenly dipped into the resin in the impregnation tank 8 when passing through the surface of the coating roller 801. The limiting rod 802 is attached to the top of the coating roller 801 and forms a relative rotational motion with it. This structure can control the thickness of the glue on the fiber surface. When the fiber passes between the coating roller 801 and the limiting rod 802, the excess glue will be scraped off or restricted, so that the glue thickness on the fiber surface is kept within a suitable range, and the position of the linear fibers can also be restricted.
[0038] The specific operating procedure of this utility is as follows: The linear fiber to be wound is released through the external wire feeding mechanism and introduced by the components on the surface of the winding machine moving frame 5. The linear fiber bundle first passes through two guide rods 803 that are staggered on one side of the outer wall of the glue impregnation tank 8 and is pulled to the position of the glue coating roller 801.
[0039] Insert the limiting rod 802 into the slot at the top of the impregnation tank 8, so that its bottom is attached to the top of the coating roller 801, and fix the position of the wire harness at that point. Then, the linear fiber thread passes through the surface of the lower roller body inside the second guide group 9, and then passes out through the guide ring set above the second guide group 9. It is pulled upward and introduced to the other side of the winding machine moving frame 5 by means of the surface of the steering roller 10.
[0040] The linear fiber is pulled downwards, guided by three triangularly distributed rollers in the first guide group 7, and then passed through the through hole on one side of the winding head 6 and the guide ring set on the winding head 6, and then passed through multiple staggered rollers on the winding head 6.
[0041] Since this is the first operation, manual assistance is required to transport the fiber thread. To avoid insufficient impregnation of the fiber thread during the initial operation, the outer wall of the steel core mold 1 is coated with appropriate resin to help fix the fiber thread at the beginning. After fixing the end cable, the pressure block 11 is used to fix it on the processed end face. The pressure block 11 adopts a split structure with a semi-circular main body and slots at both ends for screws to pass through. The pressure block 11 is fixed between the threads and the hexagonal nuts on the outside of the screws, thus covering the outside of the steel core mold 1.
[0042] Once the first fiber thread reaches a certain process aging and is fixed, the pressure block 11 can be removed and the power is turned on. At this time, the linear fiber thread is continuously released with the help of the external feeding mechanism. The steel core mold 1 is rotated by the drive mechanism, and the reciprocating screw 4 drives the winding machine moving frame 5 to make reciprocating horizontal movements. Under the synergistic effect of these components, the winding head 6 winds the linear fiber on the outside of the steel core mold 1 at an angle of ±30°.
[0043] Throughout the automated winding process, multiple components work together to ensure the tension of the fiber thread. The first guide group 7, the second guide group 9, and the steering roller 10 guide and constrain the path of the linear fiber thread, so that the linear fiber thread maintains a certain tension during movement. The glue-applying roller 801 and the limiting rod 802 in the glue-impregnation tank 8 work together to apply glue to the fiber thread on the one hand, and also to a certain extent restrict the relaxation of the linear fiber thread on the other hand.
[0044] When the winding machine moving frame 5 moves to the other end of the steel mandrel 1, the winding head 6 continues to use the original ±45° alternating winding drive mechanism (servo motor drive system with angle encoder). By resetting the control system parameters (adjusting the target angle from the original ±45° to ±30°), and combining the real-time monitoring of the rotation angle by the drive mechanism angle encoder, a precise angle output of ±30° is achieved. When the winding head 6 returns to the starting end, the drive power of the winding machine moving frame 5, the winding head 6 and the steel mandrel 1 is turned off.
[0045] After shutting down the equipment, the mesh fiber layer wound on the surface of the layer 2 is unfolded and laid on the linear fiber surface. The laying is carried out by rotating the steel mandrel 1. After the radial laying requirements are met, it is cut with the help of external tools to complete the installation of the mesh fiber layer. The resin flowing on the surface of the linear fiber that was originally wound at ±30° can fully penetrate into the laid mesh fiber layer, making its porosity <0.5% (conventional process ≥1.2%) and its strength retention rate >95% after damp heat aging. Then, it is further positioned and disassembled with the help of the end pressure blocks 11. The linear fiber is then wound along the surface of the mesh fiber layer by the winding machine moving frame 5 and the winding head 6. The above process is repeated to finally produce a new type of high-strength FRP core.
[0046] The recycling tray 3 can receive the resin material dripping from above, making it easy to recycle and reducing the risk of slipping due to resin residue on the ground, as well as the potential for contamination of the components below.
[0047] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.
Claims
1. A device for preparing a novel high-strength FRP core for electrolytic copper foil, comprising a steel core mold (1), characterized in that: A layup device (2) is provided directly above the steel core mold (1). A mesh fiber layer is sleeved on the outside of the layup device (2). A winding machine moving frame (5) is slidably connected to one side of the steel core mold (1) and the layup device (2). A drive mechanism for driving the winding machine moving frame (5) to move back and forth is provided below the winding machine moving frame (5). A winding head (6) with a 30° inclined angle is rotatably connected to one side of the outer wall of the winding machine moving frame (5). An impregnation tank (8) is fixedly connected to the other side of the outer wall of the winding machine moving frame (5). A guide group is rotatably connected above the winding head (6) and above the impregnation tank (8). A pressure block (11) for axially fixing the fiber layer is sleeved at both ends of the outer wall of the steel core mold (1).
2. The apparatus for preparing a novel high-strength FRP core for electrolytic copper foil according to claim 1, characterized in that: The steel core mold (1), the layup device (2), the reciprocating screw (4) and the winding machine moving frame (5) are all integrated into one unit by the frame. The frame is provided with connecting ends at both ends of the corresponding steel core mold (1) and layup device (2). Flanges are fixedly installed at the connecting ends. Both ends of the steel core mold (1) and layup device (2) are provided with flanges of the same specification, and are fixedly connected to the flanges at both ends of the frame by flange bolts.
3. The apparatus for preparing a novel high-strength FRP core for electrolytic copper foil according to claim 1, characterized in that: The steel core mold (1) is provided with a recycling tray (3) below it. The recycling tray (3) is provided with a drive mechanism that is rotatably connected to the frame below it. The drive mechanism includes a reciprocating screw (4) driven by a servo motor. One end of the bottom of the winding machine moving frame (5) is sleeved on the outer wall of the reciprocating screw (4) and forms a spiral transmission structure with it.
4. The apparatus for preparing a novel high-strength FRP core for electrolytic copper foil according to claim 1, characterized in that: The winding machine moving frame (5) has a drive mechanism installed on one side of the corresponding winding head (6), and the winding head (6) is located below the steel core mold (1) on one side. Multiple rollers are rotatably connected to the surface of the winding head (6), and the multiple rollers are staggered and spaced along the surface of the winding head (6).
5. The apparatus for preparing a novel high-strength FRP core for electrolytic copper foil according to claim 1, characterized in that: The first guide group (7) is provided above the winding head (6). The first guide group (7) includes three rollers arranged in a triangle. The winding machine moving frame (5) has a slot for rotating connecting the steering roller (10) through the upper part of the corresponding first guide group (7). The steering roller (10) is located above the first guide group (7) and the second guide group (9).
6. The apparatus for preparing a novel high-strength FRP core for electrolytic copper foil according to claim 1, characterized in that: The dip tank (8) is provided with a second guide group (9) above it. The second guide group (9) includes two rollers that are rotatably connected. A hydraulic rod is rotatably connected to the outer wall of the winding machine moving frame (5) corresponding to the position of the second guide group (9). The power output end of the hydraulic rod is rotatably connected to the upper roller in the second guide group (9).
7. The apparatus for preparing a novel high-strength FRP core for electrolytic copper foil according to claim 1, characterized in that: The dip tank (8) is equipped with a coating roller (801), and the coating roller (801) is rotatably connected to the inside of the dip tank (8) through a drive mechanism located outside the dip tank (8). A limiting rod (802) is rotatably connected above the coating roller (801) in the dip tank (8). The limiting rod (802) is attached to the top of the coating roller (801) and forms a relative rotational motion with it. Two guide rods (803) are rotatably connected to one side of the outer wall of the dip tank (8).