Glass fiber composite molded octagonal solid wall tube and production method thereof

Abstract

The invention discloses a glass fiber composite molded octagonal solid wall tube and a production method thereof, belonging to the technical field of cable protection tubes, wherein the tube has a hollow cylindrical cavity and a radial outer contour in the form of a regular polygon, the number of sides of the regular polygon being ≥4; the tube wall of the glass fiber composite molded octagonal solid wall tube comprises an inner glass fiber felt cloth layer, a glass yarn layer, and an outer glass fiber felt cloth layer arranged concentrically from the inside to the outside. The product of the invention has good high temperature resistance and anti-aging performance, can adapt to the high temperature generated by overload short circuit during the use of power cables, and the material has high insulation strength and volume resistivity.

Description

Technical Field

[0001] The invention belongs to the technical field of cable protection tubes, and in particular relates to a glass fiber composite molded octagonal solid wall tube and a production method thereof. Background Art

[0002] Power cable communication protection pipes, such as HDPE double-wall corrugated pipes, referred to as PE corrugated pipes, were first developed in Germany in the early 1980s. After more than ten years of development and improvement, it has developed from a single variety to a complete product series. The production process and application technology are very mature. Due to its excellent performance and relatively economical cost, it is widely used in the discharge and recovery of urban sewage and rainwater, as well as in agriculture, chemical industry, underground communication pipelines and other pipe networks.

[0003] However, the existing power cable communication protection tube still has the following shortcomings:

[0004] 1. The impact resistance of the corrugated pipe is low, and its brittleness is obvious. There is a technical problem of easy breakage, and it is easy to break when the pipe falls or rolls.

[0005] 2. As an underground pipe, the cable protection pipe has high requirements for tensile strength. The tensile strength of existing pipes is basically no higher than 20MPa. Because the cables inside are heavy, the pipes are prone to rupture when encountering bends, suspended ground, and high ground during the cable pulling process. The root growth of trees and other plants near the pipes may damage the pipes. The broken pipes buried underground are easy for groundwater to enter the pipes, and rodents such as mice can easily enter the pipes, posing a danger to the safety of the cables inside.

[0006] 3. Round pipes are easy to roll, difficult to fix during installation, and easy to move during transportation, causing damage to the pipes.

[0007] The applicant has long been committed to improving the production process and product structure of power cable communication protection tubes to effectively improve the various performance characteristics of power cable communication protection tubes, so as to gradually solve the problems existing in the production and use of power cable communication protection tubes. The present invention proposes solutions to the problems existing in the above-mentioned existing power cable communication protection tubes. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a glass fiber composite molded octagonal solid wall tube.

[0009] Another object of the present invention is to provide a method for producing the above-mentioned glass fiber composite molded octagonal solid wall tube.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions.

[0011] A glass fiber composite molded octagonal solid wall tube, which has a hollow cylindrical cavity and a radial outer contour in the form of a regular polygon, the number of sides of which is ≥4; the tube wall of the glass fiber composite molded octagonal solid wall tube includes an inner glass fiber felt cloth layer, a glass yarn layer, and an outer glass fiber felt cloth layer which are concentrically arranged from the inside to the outside; the inner glass fiber felt cloth layer is cylindrical; the glass yarn layer is wound around the outer wall of the inner glass fiber felt cloth layer, and the glass yarn layer is provided with axially arranged glass yarns, and the inner wall of the cross section of the glass yarn layer is circular, and the outer wall of the cross section is a regular polygon, the number of sides of which is ≥4; the outer glass fiber felt cloth layer is wound around the outer wall of the glass yarn layer; the inner glass fiber felt cloth layer and the outer glass fiber felt cloth layer are provided with an adhesive, the adhesive fills the gaps between the glass yarns in the glass yarn layer to fix the glass yarns as a whole; the inner glass fiber felt cloth layer is bonded to the glass yarn layer; the glass yarn layer is bonded to the outer glass fiber felt cloth layer.

[0012] The glass fiber composite molded octagonal solid wall tube has a radial outer contour of a regular octagon.

[0013] The inner glass fiber felt cloth layer and the outer glass fiber felt cloth layer are both provided with a rough surface and a smooth surface; the smooth surface of the inner glass fiber felt cloth layer is arranged inwardly to form a smooth inner wall of the glass fiber composite molded octagonal solid wall tube, and the rough surface of the inner glass fiber felt cloth layer is arranged outwardly and bonded to the glass yarn layer through an adhesive; the smooth surface of the outer glass fiber felt cloth layer is arranged outwardly to form a smooth outer wall of the glass fiber composite molded octagonal solid wall tube, and the rough surface of the outer glass fiber felt cloth layer is arranged inwardly and bonded to the glass yarn layer through an adhesive.

[0014] The glass yarn layer comprises a first yarn layer and a second yarn layer; the second yarn layer is sleeved on the outer wall of the first yarn layer, and both the first yarn layer and the second yarn layer are provided with axial glass yarns; the first yarn layer and the second yarn layer are soaked in adhesive.

[0015] The adhesive is resin.

[0016] The inner glass fiber felt cloth layer and the outer glass fiber felt cloth layer are both provided with warp belts and weft belts in the shape of belts; the weft belts are perpendicular to the warp belts and are arranged on the same side of the warp belts; the warp belt sleeves are provided with spiral bunching wires; the bunching wires are wound from the rear part of the warp belt to the front part of the weft belt, and then obliquely upward around the weft belt and then wound to the rear part of the warp belt to complete a weaving unit; the spin directions of adjacent bunching wires are opposite.

[0017] A method for producing a glass fiber composite molded octagonal solid wall tube, characterized in that it comprises the following steps:

[0018] Step 1: sleeve the inner glass fiber felt cloth layer on a cylindrical mold, with the smooth surface of the inner glass fiber felt cloth layer facing inwards;

[0019] Step 2: After the glass yarn is soaked in the resin, it is forwardly wound around the inner glass fiber felt cloth layer to form a first yarn layer;

[0020] Step 3, after the glass yarn is soaked in the resin, it is reversely wound around the first yarn layer to form a second yarn layer; and the glass yarn is accumulated at each corner of the regular polygon to form the outer corner of the regular polygon;

[0021] Step 4: Cover the outer glass fiber felt cloth layer on the second yarn layer, with the hair surface of the outer glass fiber felt cloth layer facing inwards;

[0022] Step 5: Heat or let stand to set.

[0023] This glass fiber composite octagonal solid wall tube uses a whole piece of felt inside and outside to ensure the performance of the product. The product of the present invention has good high temperature resistance and anti-aging performance, can adapt to the high temperature generated by overload short circuit during the use of power cables, and the material has high insulation strength and volume resistivity; good flexibility and high compressive strength, resistance to uneven settlement, no need to encapsulate and pour concrete at the construction site; the inner wall surface friction coefficient is small, which is convenient for use and has a long product life. In addition, the tensile strength of the tube is greatly improved by setting the yarn layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 It is a schematic diagram of the structure of glass fiber felt;

[0027] In the figure: a cylindrical cavity 1, an inner glass fiber felt cloth layer 2, a glass yarn layer 3, a first yarn layer 4, a second yarn layer 5, an outer glass fiber felt cloth layer 6, a warp tape 7, a weft tape 8, and a clustering yarn 9. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] A glass fiber composite molded octagonal solid wall tube, which has a hollow cylindrical cavity 1 and a radial outer contour that is a regular polygon, the number of sides of the regular polygon being ≥4; the tube wall of the glass fiber composite molded octagonal solid wall tube comprises an inner glass fiber felt cloth layer 2, a glass yarn layer 3, and an outer glass fiber felt cloth layer 6 that are concentrically arranged from inside to outside.

[0030] Preferably, the tube wall of the glass fiber composite molded octagonal solid wall tube is composed of an inner glass fiber felt cloth layer 2, a glass yarn layer 3, and an outer glass fiber felt cloth layer 6 which are arranged concentrically.

[0031] The inner glass fiber felt cloth layer 2 is wound into a cylindrical shape.

[0032] The glass yarn layer 3 is wound around the outer wall of the inner glass fiber felt layer 2, and the glass yarn layer 3 is provided with axially arranged glass yarns, and the inner wall of the cross section of the glass yarn layer 3 is circular, and the outer wall of the cross section is a regular polygon, and the number of sides of the regular polygon is ≥ 4. The axial direction is the extension of the tube. The radial direction is perpendicular to the axial direction.

[0033] Preferably, the above regular polygons are all regular octagons.

[0034] This glass fiber composite molded octagonal solid wall tube adopts a double-layer structure and an octagonal external design, which improves the compressive strength and bending resistance. It is sturdy and durable, with good impact resistance. The octagonal external design allows it to be placed stably and not easy to roll. After multiple corrugated tubes are bundled, they are not easy to move between each other, and the installation is stable and occupies a small area.

[0035] The glass yarn layer 3 includes a first yarn layer 4 and a second yarn layer 5; the second yarn layer 5 is sleeved on the outer wall of the first yarn layer 4, and the first yarn layer 4 and the second yarn layer 5 are both provided with axial glass yarns; the first yarn layer 4 and the second yarn layer 5 are soaked in adhesive.

[0036] Preferably, the adhesive is resin.

[0037] The outer glass fiber felt cloth layer 6 is wound around the outer wall of the glass yarn layer 3 .

[0038] The inner glass fiber felt cloth layer 2 and the outer glass fiber felt cloth layer 6 are provided with adhesive, which fills the gaps between the glass yarns in the glass yarn layer 3 to fix the glass yarns as a whole; the inner glass fiber felt cloth layer 2 and the glass yarn layer 3 are bonded; the glass yarn layer 3 and the outer glass fiber felt cloth layer 6 are bonded.

[0039] The inner glass fiber felt cloth layer 2 and the outer glass fiber felt cloth layer 6 are both provided with a matte surface and a smooth surface; the smooth surface of the inner glass fiber felt cloth layer 2 is arranged inwardly to form a smooth inner tube wall of the glass fiber composite molded octagonal solid wall tube, and the matte surface of the inner glass fiber felt cloth layer 2 is arranged outwardly and bonded to the glass yarn layer 3 through an adhesive, thereby increasing the bonding strength between the inner glass fiber felt cloth layer 2 and the glass yarn layer 3. The smooth surface of the outer glass fiber felt cloth layer 6 is arranged outwardly to form a smooth outer tube wall of the glass fiber composite molded octagonal solid wall tube, and the matte surface of the outer glass fiber felt cloth layer 6 is arranged inwardly and bonded to the glass yarn layer 3 through an adhesive, thereby increasing the bonding strength between the outer glass fiber felt cloth layer 6 and the glass yarn layer 3.

[0040] Preferably, the inner glass fiber felt cloth layer 2 and the outer glass fiber felt cloth layer 6 are both provided with warp belts 7 and weft belts 8, both of which are in the shape of belts; the weft belts 8 are perpendicular to the warp belts 7 and are arranged on the same side of the warp belts 7; the warp belts 7 are sleeved with spiral bunching wires 9; the bunching wires 9 are wound from the rear of the warp belts 7 to the front of the weft belts 8, and then obliquely upward around the weft belts 8 and then from the rear of the warp belts 7 to complete a weaving unit; the spin directions of adjacent bunching wires 9 are opposite.

[0041] A method for producing a glass fiber composite molded octagonal solid wall tube comprises the following steps:

[0042] Step 1: sleeve the inner glass fiber felt cloth layer 2 on a cylindrical mold, with the shiny surface of the inner glass fiber felt cloth layer 2 facing inwards;

[0043] Step 2: After the glass yarn is soaked in the resin, it is forwardly wound around the inner glass fiber felt cloth layer 2 to form a first yarn layer 4;

[0044] Step 3: After the glass yarn is soaked in the resin, it is reversely wound around the first yarn layer 4 to form a second yarn layer 5; and the glass yarn is accumulated at each corner of the regular polygon to form the outer corner of the regular polygon;

[0045] Step 4: sleeve the outer glass fiber felt cloth layer 6 on the second yarn layer 5, with the hair surface of the outer glass fiber felt cloth layer 6 facing inwards;

[0046] Step 5: Heat or let stand to set.

[0047] Here, forward winding and reverse winding refer to the arrangement direction of the glass yarns one by one, which only means that the arrangement directions of the glass yarns of the first yarn layer 4 and the second yarn layer 5 are opposite.

[0048] When the glass yarns of the first yarn layer 4 and the second yarn layer 5 are arranged in opposite directions, it is beneficial to balance the overall arrangement direction of the glass yarns, so that the performance of the yarns in the axial direction is uniform.

[0049] The inner wall and the outer wall of the glass fiber composite molded octagonal solid wall tube are both smooth surfaces, thereby reducing the wear of the tube wall and facilitating the flow.

[0050] At the same time, the inner and outer walls of the glass fiber composite molded octagonal solid wall tube are both glass fiber felt cloth, which makes the tube have excellent properties of high temperature resistance, corrosion resistance, insulation, flame retardancy, shock absorption and sound absorption.

[0051] In addition, the pipe has higher resistance to deformation and tearing, and has excellent axial strength, so that it will not be easily damaged during actual use, while increasing its scope of use and service life.

[0052] In this embodiment, the performance indicators of the glass fiber composite molded octagonal solid wall tube and the ordinary cable protection tube are:

[0053] Performance Indicators Ordinary cable protection tube This glass fiber composite molding octagonal solid wall tube Tensile Strength >10MPa >21MPa Tensile strength after aging 158℃, 168h >6.5MPa >15.5MPa Cold bending -10±2℃, 4h, no cracking -10±2℃, 4h, no cracking

[0054] Ring stiffness test:

[0055] Take a 300mm section from three sleeves as a test sample. Cut the two ends of the sample perpendicular to the axis and place it between the two pressure plates of the compression test machine. Compress the sample at a speed of 5±2mm / min and read the pressure value when the outer diameter is compressed by 3.0%. Take the arithmetic mean of the test results of the three samples as the test result.

[0056] For this pipe, the ring stiffness is ≥62KN / m 2 , much higher than the ring stiffness of ordinary cable protection tubes ≥ 8KN / m 2 .

[0057] In the flattening test, when the sample is loaded to a deformation amount in the vertical direction of 30% of the original inner diameter, the sample does not crack or break. The sample does not crack or break when the drop hammer impacts 4.00Kg and 1200mm. The Vicat softening temperature is ≥126℃.

[0058] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. Glass fiber composite molded octagonal solid wall tube, characterized in that: It is provided with a hollow cylindrical cavity and its radial outer contour is a regular polygon, the number of sides of the regular polygon is ≥4; the tube wall of the glass fiber composite molded octagonal solid wall tube includes an inner glass fiber felt cloth layer, a glass yarn layer, and an outer glass fiber felt cloth layer which are arranged concentrically from the inside to the outside; the inner glass fiber felt cloth layer is cylindrical; the glass yarn layer is wound around the outer wall of the inner glass fiber felt cloth layer, and the glass yarn layer is provided with axially arranged glass yarns, and the inner wall of the cross section of the glass yarn layer is circular, and the outer wall of the cross section is a regular polygon, the number of sides of the regular polygon is ≥4; the outer glass fiber felt cloth layer is wound around the outer wall of the glass yarn layer; the inner glass fiber felt cloth layer and the outer glass fiber felt cloth layer are provided with an adhesive, and the adhesive fills the gaps between the glass yarns in the glass yarn layer so as to fix the glass yarns as a whole; the inner glass fiber felt cloth layer and the glass yarn layer are bonded; the glass yarn layer and the outer glass fiber felt cloth layer are bonded; The glass yarn layer comprises a first yarn layer and a second yarn layer; the second yarn layer is sleeved on the outer wall of the first yarn layer, and the first yarn layer and the second yarn layer are both provided with axial glass yarns; the glass yarns of the first yarn layer and the second yarn layer are arranged in opposite directions; the first yarn layer and the second yarn layer are soaked in adhesive; The inner glass fiber felt cloth layer and the outer glass fiber felt cloth layer are both provided with warp belts and weft belts in the shape of belts; the weft belts are perpendicular to the warp belts and are arranged on the same side of the warp belts; the warp belt sleeves are provided with spiral bunching wires; the bunching wires are wound from the rear part of the warp belt to the front part of the weft belt, and then obliquely upward around the weft belt and then wound to the rear part of the warp belt to complete a weaving unit; the spin directions of adjacent bunching wires are opposite.

2. The glass fiber composite molded octagonal solid wall tube according to claim 1, characterized in that: Its radial outer contour is a regular octagon.

3. The glass fiber composite molded octagonal solid wall tube according to claim 1, characterized in that: The inner glass fiber felt cloth layer and the outer glass fiber felt cloth layer are both provided with a rough surface and a smooth surface; the smooth surface of the inner glass fiber felt cloth layer is arranged inwardly to form a smooth inner wall of the glass fiber composite molded octagonal solid wall tube, and the rough surface of the inner glass fiber felt cloth layer is arranged outwardly and bonded to the glass yarn layer through an adhesive; the smooth surface of the outer glass fiber felt cloth layer is arranged outwardly to form a smooth outer wall of the glass fiber composite molded octagonal solid wall tube, and the rough surface of the outer glass fiber felt cloth layer is arranged inwardly and bonded to the glass yarn layer through an adhesive.

4. The glass fiber composite molded octagonal solid wall tube according to claim 1 or 3, characterized in that: The adhesive is resin.

5. A method for producing a glass fiber composite molded octagonal solid wall tube as claimed in claim 1, characterized in that: The following steps are included Step 1: sleeve the inner glass fiber felt cloth layer on a cylindrical mold, with the smooth surface of the inner glass fiber felt cloth layer facing inwards; Step 2: After the glass yarn is soaked in the resin, it is forwardly wound around the inner glass fiber felt cloth layer to form a first yarn layer; Step 3, after the glass yarn is soaked in the resin, it is reversely wound around the first yarn layer to form a second yarn layer; and the glass yarn is accumulated at each corner of the regular polygon to form the outer corner of the regular polygon; Step 4: Cover the outer glass fiber felt cloth layer on the second yarn layer, with the hair surface of the outer glass fiber felt cloth layer facing inwards; Step 5: Heat or let stand to set.

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