Fiber reinforced composite cylinder

Abstract

The utility model aims to provide a fiber reinforced composite cylinder, which aims to overcome the defects that a cylinder for a storage tank or a reaction container in the prior art is made of a single PP (polypropylene) or PPH (polypropylene) material, so that the cylinder is poor in rigidity and pressure bearing capacity and easy to deform in a forming process, and the rigidity and the strength of a product need to be increased by increasing the thickness. The cylinder body comprises a base material layer and a fiber reinforcement layer, the fiber reinforcement layer is arranged in the base material layer in a surrounding mode, and the fiber reinforcement layer and the base material layer are fused with each other, by means of the fiber reinforcement composite cylinder body, the overall rigidity of the cylinder body is improved, the pressure bearing capacity of the cylinder body can be improved on the premise that the thickness of the whole cylinder body is not increased, and the service life of the cylinder body is prolonged. Compared with a cylinder without the fiber reinforced layer, the pressure bearing capacity of the cylinder is greatly improved by 20-30%, and compared with a structure in which the fiber reinforced layer is separated from the base material layer, the pressure bearing capacity of the cylinder is improved by 17-20%, and unexpected technical effects are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinders, and particularly relates to a fiber-reinforced composite cylinder for preparing storage tanks or reaction vessels. Background Art

[0002] At present, the cylinders used for PP storage tanks are mostly made of PP or PPH particles. They are obtained by hot melt extrusion and then winding onto a mold. After forming, the end caps are welded to be used for various storage tanks or reaction vessels. This kind of cylinder has many advantages of environmental protection and green production, such as no hazardous waste generated during the production process, and the waste materials can be recycled for secondary use. In recent years, it has gradually replaced the FRP storage tank products in the domestic fields of chemical industry, medicine, environmental protection, etc. However, it also has certain defects. The PP or PPH material has poor stiffness and poor pressure-bearing capacity. Most of them rely on increasing the thickness of the cylinder to improve its stiffness and strength. However, increasing the cylinder thickness is prone to deformation during the manufacturing process, which increases the processing amount and processing difficulty in the later stage. To a certain extent, it restricts the further popularization and application of this production process. Content of the Utility Model

[0003] The purpose of the utility model is to provide a fiber-reinforced composite cylinder in view of the deficiencies of the existing cylinders for storage tanks or reaction vessels, which are made of a single PP or PPH material, resulting in poor stiffness and poor pressure-bearing capacity, being prone to deformation during the forming process, and relying on increasing the thickness to increase the stiffness and strength of the product.

[0004] The technical solution for the utility model to solve the technical problems is as follows:

[0005] A fiber-reinforced composite cylinder, the cylinder includes a base material layer and a fiber reinforcement layer. The fiber reinforcement layer is disposed around the base material layer, and the fiber reinforcement layer and the base material layer are mutually fused;

[0006] The fiber reinforcement layer is spirally wound along the axial direction of the cylinder inside the base material layer;

[0007] The fibers in the fiber reinforcement layer are linearly distributed, or reticularly distributed, or alternately distributed in a reticular and linear pattern;

[0008] The fiber reinforcement layer is in a strip shape, with a width of 50 - 200 mm and a thickness of 0.1 - 1 mm;

[0009] The fiber reinforcement layer is a cord fabric, with a width of 50 - 200 mm and a thickness of 0.1 - 1 mm;

[0010] A protective layer is disposed outside the base material layer provided with the fiber reinforcement layer. The protective layer completely covers the fiber reinforcement layer and is fused with the base material layer as a whole;

[0011] Two or more fiber reinforcement layers are provided within the base material layer, and the fiber reinforcement layers are separated from each other in the diameter direction of the cylinder body, and the winding directions of the fiber reinforcement layers are the same or opposite.

[0012] The single-layer thickness of the base material layer is 8 - 16 mm.

[0013] The advantages and beneficial effects of the present utility model are as follows:

[0014] For the fiber-reinforced composite cylinder of the present utility model, fiber reinforcement layers are distributed within the base material layer of PP or PPH material. The fiber reinforcement layers and the base material layer penetrate and fuse with each other. Therefore, the soft base material layer obtains a support framework, improving the overall stiffness of the cylinder. Without increasing the thickness of the entire cylinder, the pressure-bearing capacity of the cylinder can be improved, greatly enhancing the pressure-bearing capacity of the cylinder. Compared with the cylinder without fiber reinforcement layers, its pressure-bearing capacity can be increased by 20 - 30%, and compared with the structure where the fiber reinforcement layer and the base material layer are separated, its pressure-bearing capacity can be increased by 17 - 20%, achieving unexpected technical effects. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the fiber-reinforced composite cylinder of the present utility model;

[0016] Figure 2 is a schematic structural diagram of another embodiment of the fiber-reinforced composite cylinder of the present utility model;

[0017] Figure 3 is a schematic structural diagram of another embodiment of the fiber-reinforced composite cylinder of the present utility model;

[0018] Figure 4 Schematic cross-sectional view of an embodiment of the fiber-reinforced composite cylinder of the present utility model;

[0019] Figure 5 is a schematic structural diagram of an embodiment of the forming equipment for manufacturing the fiber-reinforced composite cylinder of the present utility model;

[0020] Figure 6 is for Figure 5 top view schematic diagram;

[0021] Figure 7 is a schematic structural diagram of an embodiment of the second feeding device for the forming equipment of the present utility model;

[0022] Description of the Reference Numerals

[0023] 100 - Roller stand, 101 - Frame body, 102 - Roller, 200 - Mold, 300 - Translating overhead crane, 400 - First feeding device, 500 - Second feeding device, 501 - Disc feeder, 502 - Flattening guide, 503 - Tensioning wheel, 504 - Tensioning wheel driving device, 505 - Stress sensor, 506 - Belt / rope - like fiber.

[0024] 600 - Cylinder body, 601 - Base material layer, 602 - Fiber - reinforced layer, 603 - Protective layer. Specific embodiments

[0025] The present utility model will be further described in detail through specific embodiments below. The following embodiments are only descriptive and not restrictive, and the protection scope of the present utility model cannot be limited thereby.

[0026] As Figures 1 - 4 shown, the present utility model provides a fiber - reinforced composite cylinder body, which includes a base material layer 601 composed of a forming material and a fiber - reinforced layer 602 composed of a fiber - reinforced material. The fiber - reinforced layer is disposed around and integrally fused within the base material layer. There are base materials both inside and outside the fiber - reinforced layer and within the fiber - reinforced layer. With this structure, the base material layer serves as the main body of the cylinder body, and the fiber - reinforced layer serves as the skeleton of the cylinder body. The fiber - reinforced layer supports the base material layer, and the fiber - reinforced layer can improve the overall strength and stiffness of the cylinder body, thereby enhancing the overall pressure - bearing capacity of the cylinder body. The base material layer is also distributed within the gaps between the fibers of the fiber - reinforced layer. The fiber - reinforced layer and the base material layer are mutually embedded and fused, and there is no clear delamination between the fiber - reinforced layer and the base material layer. Therefore, the combination between the fiber - reinforced layer and the base material layer is tight and will not form a completely independent layered structure. During use, the fiber - reinforced layer and the base material layer will not delaminate from each other, and the structural stability is good. The fiber - reinforced layer can be linearly distributed or reticularly distributed, and preferably is reticularly distributed within the base material layer. Preferably, a cord fabric is used as the fiber - reinforced layer, and the cord fabric is flatly wound within the base material layer. Preferably, a layer of forming material is further provided outside the base material as a protective layer to completely cover the fiber - reinforced layer. In this way, it can better protect the fiber - reinforced layer, increase the corrosion resistance of the cylinder body, and improve the bonding firmness between the two. The cylinder body of the present utility model is entirely composed of a base material, with the fiber - reinforced layer serving as the reinforcing skeleton. Depending on the number of winding passes of the forming material and the number of winding passes of the fiber - reinforced material during winding, there can be multiple base material layers and multiple fiber - reinforced layers. The fiber - reinforced layers are separated from each other, and each fiber - reinforced layer can be a single - layer fiber - reinforced layer or a composite fiber - reinforced layer formed by superimposing two or more fiber - reinforced layers.

[0027] The cylinder body of the present utility model can be obtained by the following method.

[0028] As Figures 5 - 7As shown in the figure, the cylinder body of the present utility model can be prepared by the following forming equipment and forming method. The forming equipment includes a roller rack 100 that can rotate forward and backward independently, a cylindrical mold 200 driven by the roller rack on the roller rack 100, and a mobile crane 300. The roller rack is commonly known as a tire drum, which includes a frame body 101, two rollers 102 and a driving device. The rollers are rotatably arranged on the frame body. The two rollers are arranged oppositely, and the roller shafts of the two rollers are parallel. The cylindrical mold is located between the two rollers and is supported by the two rollers, and is frictionally and rotationally connected to the two rollers. The driving device drives the two rollers to rotate one forward and one backward, so as to drive the cylindrical mold to rotate. The mobile crane is arranged on the ground or on the track and travels back and forth along the roller rack, and its traveling direction is parallel to the extension line direction of the roller shaft. A first feeding device 400 and a second feeding device 500 are arranged on the mobile crane. The first feeding device and the second feeding device respectively output materials to the mold for forming on the mold. The material output by the first feeding device 400 is a formed material formed by melting and extrusion, such as polypropylene PP, high-performance polypropylene PPH or polytetrafluoroethylene PTFE. The material output by the second feeding device is a fiber-reinforced material, and its material is a fiber-reinforced material with high specific strength, such as glass fiber, carbon fiber, PPTA fiber, etc. It can be strip-shaped fiber-reinforced material or yarn fiber. When using strip-shaped or strip-shaped fiber material, its width is generally 50-200mm and its thickness is 0.1-1mm. It is preferably to use cord fabric as the fiber-reinforced material. Cord fabric is a tire skeleton fabric woven with strong ply yarns as the warp and medium and fine count single yarns as the weft, and it is easily available in the market. The material output by the first feeding device is a molten or semi-molten formed material, forming the main part of the formed cylinder body. The material output by the second feeding device is a fiber-reinforced material, mainly to improve the stiffness and strength of the cylinder body. The formed material output by the first feeding device and the reinforcing material output by the second feeding device are both wound on the surface of the mold. While the roller rack 100 rotates, the mobile crane 300 moves along the roller rack from one side of the roller rack to the other side at the same time, so as to evenly wind the materials output by the first feeding device and the second feeding device from one side of the mold to the other side of the mold, so that the materials cover the surface of the mold. The first feeding device 400 winds first, that is, the material output by the first feeding device is wound on the surface of the mold first, and the material output by the second feeding device is wound after the material output by the first feeding device. When the second feeding device 500 winds, a preset tension force needs to be set, so that the fiber-reinforced material output by the second feeding device sinks or embeds into the soft formed material output by the first feeding device, so that the materials output by the first feeding device 400 and the second feeding device 500 are tightly fused together. That is to say, the molten PP or PPH material output by the first feeding device contains fiber reinforcement.It is best to wind the material of the second feeding device 500 when the output material temperature of the first feeding device 400 is within the range of 80 - 200 °C. At this temperature, the PP or PPH material is in a semi-molten state with a relatively high temperature. The formed material output by the first feeding device has a certain supporting force and a certain degree of inclusiveness in this state. The fiber-reinforced material can be supported by the formed material and can also be pressed into the formed material, so that the fiber-reinforced material and the formed material are combined relatively tightly. After forming, the two form a whole and will not separate from each other.

[0029] Preferably, the second feeding device 500 adopts the following structure, including a disk feeder 501, a tensioning wheel 503, and a tensioning wheel pushing device. The fiber-reinforced material is wound around the disk of the disk feeder. The fiber-reinforced material is usually a tape. The disk of the disk feeder is rotatably arranged on the frame. The tensioning wheel pushing device is connected to the axle of the tensioning wheel. The tensioning wheel is located between the disk of the disk feeder and the mold. The head end of the fiber-reinforced material is led out from the disk and wound around one end of the mold. The tensioning wheel is located between the mold and the disk feeder to tension the fiber-reinforced material. The tensioning wheel pushing device pushes the axle of the tensioning wheel to move, thereby changing the position of the tensioning wheel and thus changing the tension of the fiber-reinforced material. The tensioning wheel pushing device 504 includes a linear reciprocating driving device and a push rod. One end of the push rod is connected to the output end of the linear reciprocating driving device, and the other end is connected to the tensioning wheel axle. It is preferably an electric push rod, a pneumatic push rod, or an electro-hydraulic push rod. It is preferably provided with a stress sensor 505 to detect the stress of the fiber-reinforced material. According to the stress of the fiber-reinforced material detected by the stress sensor, the position of the tensioning wheel is adjusted through the tensioning wheel pushing device to adjust the tension of the fiber-reinforced material so that it reaches a predetermined tension. When the fiber-reinforced material is a strip or a strip-shaped fiber cloth, it is preferably provided with a flattening guide. The flattening guide is provided with a through hole, and the through hole is a rectangular hole, the width of which is slightly larger than the width of the fiber reinforcement, and the height is slightly larger than the thickness of the fiber reinforcement. The fiber-reinforced material passes flatly through the through hole of the flattening guide. The coiled strip-shaped raw material is placed in the disk of the disk feeder 501, passes through the flattening guide 502, and is wound around the material wound by the first feeding device 400 on the mold under the extrusion of the tensioning wheel 503, and the fiber-reinforced material is embedded in the formed material output by the first feeding device. Preferably, a stress sensor 505 is provided at the end of the push rod connected to the tensioning wheel. The stress sensor 505 detects the tension of the fiber material. According to the detected tension of the fiber-reinforced material and the preset tension, the extension amount of the push rod is adjusted, so that the tension of the fiber reinforcement is consistent with the preset tension, and the fiber reinforcement can enter the formed material at a preset depth.

[0030] In the present utility model, the material output by the first feeding device is usually molten or semi-molten PP or PPH material. The material output by the second feeding device is a strip material with a width of 50-200 mm and a single-layer thickness of 0.1-1 mm. The material is a high specific strength material such as glass fiber, carbon fiber, PPTA fiber, etc. The single-layer winding thickness of the forming material is 8-16 mm.

[0031] In the present utility model, multiple feeding devices can also be provided to obtain multiple PP or PPH substrate layers containing fiber-reinforced materials. For example, a third feeding device and a fourth feeding device are provided. The third feeding device outputs molten or semi-molten PP or PPH forming material, and the fourth feeding device outputs fiber-reinforced material, so as to obtain two substrate layers containing fiber-reinforced materials. Each additional feeding device that outputs forming material is called adding a layer of forming material, and each additional output device that outputs fiber-reinforced material is called adding a layer of fiber-reinforced material.

[0032] Preferably, winding is carried out when the temperature of the material wound by the first feeding device is in the range of 80-250 °C, and the prestress of the fiber-reinforced material is 1-100 N / mm 2 , and the second layer of material is wound and tightly integrated with the first layer of material. Since the output temperature of the forming material is increased, before the forming material hardens, the warp and weft lines of the fiber-reinforced material can be wound into the forming material serving as the substrate and coupled into the forming material, so that the substrate layer and the fiber-reinforced layer become an integral body. Since it is wound on the surface of a cylindrical mold, a cylinder is obtained, which can be used as a storage tank or an anti-corrosion device. In the present utility model, prestress is preset, which reduces the stress deformation after the cylinder is formed and improves the accuracy and stability of subsequent processing.

[0033] Preferably, a protective layer feeding device outputs forming material to fill the indentations pressed out on the surface of the forming material due to the pressing in of the fiber-reinforced material, thereby increasing the surface smoothness of the prepared cylinder and the bonding strength between the forming material and the fiber-reinforced material. The material of the protective layer is basically the same as that of the substrate layer, so there is no obvious boundary line between the protective layer and the substrate layer.

[0034] Taking the cylinder diameter of 2500 mm as an example, a comparative experiment is carried out, and the experimental results are as follows. Example

[0035] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Diameter (inner diameter) mm 2500 2500 2500 2500 2500 2500 2500 2500 2500 Base material layer thickness mm 8 10 12 14 8 10 12 16 14 Cord fabric thickness mm 0.1 0.3 0.5 0.8 None None None 0.5 0.8 Cord layer width mm 50 80 120 150 None None None 120 150 Compressive strength MPa 26 27 27 30 20 22 23 23 25

[0036] Note: In Comparative Example 4 and Comparative Example 5, the cord fabric layer covers the outer surface of the substrate layer and does not enter the substrate layer, and the fiber-reinforced layer and the substrate layer are arranged in layers.

Claims

1. A fiber-reinforced composite cylinder, characterized in that, The cylinder body includes a base material layer composed of a molding material and a fiber reinforced layer composed of a fiber reinforced material. The fiber reinforced layer is disposed around the base material layer, and the fiber reinforced layer and the base material layer are fused with each other. The base material layer is the main body of the cylinder body, and the fiber reinforced layer is the framework of the cylinder body. The base material layer is supported by the fiber reinforced layer.

2. The fiber-reinforced composite cylinder according to claim 1, characterized in that: The fiber reinforced layer is spirally wound and disposed in the base material layer along the axial direction of the cylinder body.

3. The fiber-reinforced composite cylinder according to claim 2, wherein, The fibers in the fiber reinforced layer are linearly distributed, or net-like distributed, or alternately distributed in a net-like and linear pattern.

4. A fiber-reinforced composite cylinder according to claim 3, characterized in that: The fiber reinforced layer is strip-shaped, with a width of 50 - 200 mm and a thickness of 0.1 - 1 mm.

5. The fiber-reinforced composite cylinder according to claim 3, characterized in that: The fiber reinforced layer is a cord fabric, with a width of 50 - 200 mm and a thickness of 0.1 - 1 mm.

6. A fiber-reinforced composite cylinder according to claim 1, characterized in that: A protective layer is disposed outside the base material layer provided with the fiber reinforced layer. The protective layer completely covers the fiber reinforced layer and is integrated with the base material layer.

7. A fiber-reinforced composite cylinder according to claim 1, characterized in that: Two or more fiber reinforced layers are disposed in the base material layer. The fiber reinforced layers are separated from each other in the diameter direction of the cylinder body, and the winding directions of the fiber reinforced layers are the same or opposite.

8. A fiber-reinforced composite cylinder according to claim 1, characterized in that: The single-layer thickness of the base material layer is 8 - 16 mm.

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