Continuous-wound glass-fiber reinforced plastic cable conduit

Abstract

The utility model discloses a kind of glass fiber reinforced plastic cable conduit, including inner layer, and the outer layer formed by winding glass fiber on the surface of the inner layer, the inner layer is formed by continuous fiber hoop winding, the outer layer includes hoop fiber, and the chopped fiber staggered distribution with the hoop fiber, the chopped fiber is anisotropic distribution.The glass fiber reinforced plastic cable conduit provided by the utility model has high axial radial strength.

Description

Technical Field

[0001] This utility model relates to the field of cable conduit technology, specifically to a continuously wound glass fiber reinforced plastic cable conduit. Background Technology

[0002] Continuous winding is a production method in which resin, continuous fibers, chopped fibers, and quartz sand are continuously layered in a circumferential winding manner on a continuously output mold according to certain requirements, and then cut into pipe products of a certain length after curing. This method has the advantages of high automation, full monitoring, fewer operators, less human error; high industry threshold, fewer manufacturers, and relatively standardized; high, uniform, stable, and reliable product quality; and high production efficiency.

[0003] Existing continuous winding processes mainly involve steel strip winding, which winds a steel strip into a cylindrical mold. However, small-diameter pipes require a small radius of curvature for the steel strip, subjecting it to significant bending stress. This makes the steel strip prone to breakage during actual production, thus hindering continuous production. Therefore, current continuous winding processes are primarily suitable for producing pipes with diameters of 300mm and above.

[0004] Glass fiber reinforced plastic (GFRP) cable conduits are pipes made of glass fiber reinforced plastic material used to protect telecommunications cables, communication cables, etc. They are typically small in diameter, less than 300mm, making traditional continuous steel strip winding processes unsuitable for production. In existing technologies, the glass fibers in small-diameter GFRP cable conduits are distributed radially and axially. Because the number of axial yarns cannot be increased online to improve axial strength, the cable conduit's strength is relatively low.

[0005] The purpose of this invention is to provide a new type of glass fiber reinforced plastic cable conduit whose strength can be improved online by chopped fibers. Utility Model Content

[0006] The purpose of this invention is to provide a glass fiber reinforced plastic cable conduit with high axial and radial strength.

[0007] The technical solution of this utility model is as follows:

[0008] A glass fiber reinforced plastic cable conduit includes an inner layer and an outer layer formed by winding glass fibers around the surface of the inner layer. The inner layer is formed by continuous circumferential winding of fibers, and the outer layer includes circumferential fibers and chopped fibers interspersed with the circumferential fibers, the chopped fibers being anisotropically distributed.

[0009] Furthermore, the thickness of the inner layer is 0.5-2 mm.

[0010] Furthermore, the inner layer is formed by circumferentially winding continuous fibers impregnated with photocurable resin.

[0011] Furthermore, the length of the chopped fiber is 3-20 mm.

[0012] Furthermore, the outer layer has a thickness of 1-10 mm.

[0013] Furthermore, the diameter of the glass fiber reinforced plastic cable conduit is 50-300 mm.

[0014] Compared with the prior art, the glass fiber reinforced plastic cable conduit provided by this utility model has the following advantages:

[0015] I. The glass fiber reinforced plastic cable conduit provided by this utility model includes an inner layer and an outer layer. The inner layer is formed by continuous fiber winding, and the outer layer includes circumferential fibers and chopped fibers interspersed with the circumferential fibers, with the chopped fibers exhibiting anisotropic distribution. The combination of the circumferential fibers and the anisotropically distributed chopped fibers in the outer layer enhances the axial and radial strength of the cable conduit. The cable conduit produced by the production line of this utility model has an axial tensile strength of not less than 55 MPa and a circumferential bending strength of not less than 200 MPa.

[0016] II. The glass fiber reinforced plastic cable conduit provided by this utility model has an inner layer thickness of 0.5-2mm and an outer layer thickness of 1-10mm. The tube thickness is smaller than that of existing cable conduits, which can save on the manufacturing cost of cable conduits and improve manufacturing efficiency. By supplementing the radial and axial strength of the cable conduit with chopped fibers, and with the chopped fibers supplied online, production efficiency is further improved.

[0017] Third, the glass fiber reinforced plastic cable conduit provided by the present invention has an inner layer formed by continuous circumferential winding of fibers impregnated with light-curing resin. The inner layer is formed by light curing, which improves production efficiency compared with the traditional continuous winding process. By adjusting the curing time, the production efficiency can be 1.5-3 times that of the prior art, further improving the production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the production line for the glass fiber reinforced plastic cable conduit of this utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the middle and outer layer winding device;

[0021] Figure 3 This is a schematic diagram of the structure of the glass fiber reinforced plastic cable conduit of this utility model;

[0022] Figure 4 yes Figure 3 The diagram shows the structure of the outer layer in a glass fiber reinforced plastic cable conduit. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, and to make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be further described below.

[0024] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding of the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figure 1This is a schematic diagram of the production line for the glass fiber reinforced plastic cable conduit of this utility model. The production line for manufacturing glass fiber reinforced plastic cable conduits includes a cantilever steel mold 1, a film winding device 2, an inner layer winding device 3, a light curing device 4, an outer layer winding device 5, an outer layer curing device 6, a traction device 7, a cutting device 8, and a control device 9. The film winding device 2 is used to wind a film onto the surface of the cantilever steel mold 1. The film mainly serves as a demolding agent. During the film winding process, the cantilever steel mold 1 rotates. The inner layer winding device 3 is used to wind fibers onto the film surface to form an inner layer 10. Specifically, glass fibers and their fabrics are impregnated in a light-curing resin material. The inner layer winding device 3 pulls the fibers and fabrics impregnated with the light-curing resin material and winds them circumferentially along the film surface to form the inner layer. The light curing device 4 is used to perform ultraviolet light curing on the inner layer, allowing it to cure rapidly. The wound inner layer is connected to the traction device 7, which... 7 drives the inner layer to move continuously, allowing it to pass through the UV curing device for UV curing and molding. The cured inner layer is then pulled forward, passing sequentially through the outer layer winding device 5 and the outer layer curing device 6. The outer layer winding device winds glass fiber onto the surface of the inner layer to form the outer layer 11, and the outer layer curing device completes the curing of the outer layer, combining the inner and outer layers to form a glass fiber reinforced plastic cable conduit. The cutting device 8 cuts the continuously formed glass fiber reinforced plastic cable conduit to a set length to obtain a fixed-length cable conduit product. The control device 9 controls the working state of the corresponding devices according to set parameters. Therefore, in this invention, the film winding device 2, inner layer winding device 3, UV curing device 4, outer layer winding device 5, outer layer curing device 6, traction device 7, and cutting device 8 are arranged sequentially according to the production process.

[0026] The inner layer has a thickness of 0.5-2 mm and a light curing time of 5-10 s. The traction speed of the traction device 7 is 0.5-2 m / s; the outer layer has a thickness of 1-10 mm, the curing temperature of the outer layer curing device is 95-110℃, and the curing time is 4-6 min.

[0027] Please see Figure 2 ,yes Figure 1 A schematic diagram of the outer layer winding device. The outer layer winding device 5 includes a frame 51, a circumferential continuous fiber winding device 52 and a chopped fiber winding device 53 disposed on the frame 51; wherein, the frame 51 is a height-adjustable structure, and the position of the circumferential continuous fiber winding device 52 and the chopped fiber winding device 53 relative to the inner layer can be adjusted by adjusting its height.

[0028] The circumferential continuous fiber winding device 52 includes a circumferential fiber guiding device 521. The impregnated continuous fibers are drawn by the circumferential fiber guiding device 521 and wound circumferentially along the inner layer. The circumferential fiber guiding device 521 includes several threading guides 522 and traction rollers 523. The continuous fibers 54 pass through the threading guides and are tensioned by the traction rollers. During the winding process, the inner layer is rotated and moved forward by the traction device 7.

[0029] The chopped fiber winding device 53 includes a chopped fiber cutting device 531, a guide trough 532 inclinedly disposed at the bottom of the chopped fiber cutting device 531, a resin mixing device 533 disposed on the frame 51, and a coating tank 534 disposed at the bottom of the resin mixing device. The outlet of the resin mixing device is located above the coating tank 534, and the guide trough 532 and the coating tank 534 are located above the inner layer. The chopped fiber cutting device is a rotary cutter type fiber cutter, which cuts continuous glass fibers to the required length using a rotating cutter and pressure roller, and controls the output of chopped fibers by adjusting the rotation speed of the cutter. In this embodiment, the guide trough 532 is an inclined plate, and the cut chopped fibers slide down the inclined plate to the inner layer surface, where they are bonded and fixed to the inner layer surface with the resin material dripping from the coating tank 534.

[0030] In this embodiment, a metering pump (not shown) is installed at the outlet of the resin mixing device 533. The metering pump controls the amount of resin at the outlet to meet the resin requirement per unit length of pipeline. The resin output from the outlet of the resin mixing device enters the coating tank 534. The bottom of the coating tank 534 has multiple coating holes (not shown), which are spaced apart along the axial direction of the inner layer. During the rotation of the inner layer, the resin material dripping through the coating holes can be evenly distributed on the surface of the inner layer. Alternatively, a groove can be opened at the bottom of the coating tank, and the resin material drips from the groove onto the surface of the inner layer.

[0031] The production line for continuously wound glass fiber reinforced plastic cable conduits of this utility model includes the following steps in its production process:

[0032] Step S1: Wrap a thin film around the cantilevered steel mold;

[0033] Step S2: An inner layer is formed by winding glass fiber and its fabric and photocurable resin onto the film;

[0034] Specifically, glass fiber and its fabric are impregnated in a light-curing resin material. The impregnated glass fiber is then wound around the film in the circumferential direction by an inner layer winding device, forming an inner layer with a thickness of 0.5-2mm. The inner layer is then conveyed forward by the rotation of a cantilevered steel mold.

[0035] Step S3: Connect the inner layer to the traction device. The traction device drives the inner layer to move, so that the inner layer is cured by ultraviolet light through the light curing device.

[0036] Specifically, the inner layer curing time is 5-10 seconds. It should be noted that the inner layer curing time refers to its transport time within the curing device, i.e., the time from the inlet to the outlet of the curing device at the same position on the inner layer. The curing time can be adjusted by changing the traction speed of the traction device, or it can be adjusted according to the length range of the curing device while keeping the traction speed constant. In this invention, the traction speed of the traction device is 0.5-2 m / s.

[0037] Step S4: Using the cured inner layer as a mold, circumferential continuous fibers and chopped fibers are wound around it to form the outer layer. The inner and outer layers are combined to form a glass fiber reinforced plastic cable conduit.

[0038] Specifically, the outer layer winding device first winds continuous fibers onto the inner layer surface using a circumferential continuous winding device, and then winds anisotropic chopped fibers onto the inner layer surface using a chopped fiber winding device. The continuous fibers are wound using an impregnation method, where they are immersed in resin material and then wound circumferentially along the inner layer using the circumferential fiber guiding device of the circumferential continuous winding device. The chopped fibers are wound using a spray method, where the cut chopped fibers are scattered anisotropically on the inner layer surface and bond with the resin material dripping from the spray tank, adhering to the inner layer surface. The combination of chopped fibers and circumferential continuous fibers increases the axial and radial strength of the cable conduit. The resin used for the outer layer is a common resin, and the outer layer is cured by heat.

[0039] In this invention, the actual output of the chopped fiber winding device and the amount of chopped fiber and resin can be controlled by calculating the amount of resin and chopped fiber required per unit length of pipe. Specifically, the resin is output according to the required amount per unit length of pipe by controlling the metering pump at the outlet of the resin mixing device; the amount of chopped fiber required per unit length of pipe is adjusted by controlling the cutting speed of the chopped fiber cutting device. The length of the chopped fiber is 3-20mm, and the outer layer thickness is 1-10mm.

[0040] Step S5: The traction device pulls the glass fiber reinforced plastic cable conduit to the outer layer curing device, and the outer layer is cured by heating.

[0041] Specifically, the curing temperature is 95-110℃, and the curing time is 4-6 minutes.

[0042] Step S6: Cut to the set length to obtain a fixed-length glass fiber reinforced plastic cable conduit.

[0043] Please refer to the following: Figure 3and Figure 4 ,in Figure 3 This is a schematic diagram of the structure of the glass fiber reinforced plastic cable conduit of this utility model; Figure 4 yes Figure 3 The diagram shows the structure of the outer layer of a glass fiber reinforced plastic cable conduit. The glass fiber reinforced plastic cable conduit manufactured by the aforementioned continuous winding process includes an inner layer 10 and an outer layer 11. The inner layer 10 is formed by circumferentially winding continuous fibers impregnated with UV-cured resin, and its thickness is 0.5-2 mm. The outer layer 11 includes circumferential fibers 111 and chopped fibers 112 interleaved with the circumferential fibers, and the chopped fibers are anisotropically distributed. In this invention, the thickness of the outer layer 11 is 1-10 mm.

[0044] The glass fiber reinforced plastic cable conduit of this utility model has a diameter of 50-300mm, an axial tensile strength of not less than 55MPa, and a circumferential bending strength of not less than 200MPa.

[0045] The embodiments of this utility model have been described in detail above, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A continuously wound glass fiber reinforced plastic cable conduit, characterized in that, It includes an inner layer and an outer layer formed by winding glass fibers around the surface of the inner layer. The inner layer is formed by continuous fibers wound in a circumferential direction, and the outer layer includes circumferential fibers and short chopped fibers that are interspersed with the circumferential fibers and are anisotropically distributed.

2. The continuously wound glass fiber reinforced plastic cable conduit according to claim 1, characterized in that, The thickness of the inner layer is 0.5-2 mm.

3. The continuously wound glass fiber reinforced plastic cable conduit according to claim 1, characterized in that, The inner layer is formed by continuous fibers impregnated with light-cured resin wound circumferentially.

4. The continuously wound glass fiber reinforced plastic cable conduit according to claim 1, characterized in that, The length of the chopped fibers is 3-20 mm.

5. The continuously wound glass fiber reinforced plastic cable conduit according to claim 1, characterized in that, The outer layer has a thickness of 1-10 mm.

6. The continuously wound glass fiber reinforced plastic cable conduit according to any one of claims 1-5, characterized in that, The diameter of the glass fiber reinforced plastic cable conduit is 50-300 mm.

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