Micro-beam flat rat-proof photoelectric composite cable, production mold and method

Abstract

The present invention discloses a micro-bundle flat rat-proof photoelectric composite cable, a production mold and a production method. The composite cable comprises an optical cable unit and an electrical cable unit. The optical cable unit arranges a plurality of optical fiber units in a micro-bundle tube, and the plurality of micro-bundle tubes are spirally twisted in a loose tube. The loose tube is filled with fiber paste, and the loose tube is coated with a plurality of spirally wound metal reinforcements, and the plurality of metal reinforcements are coated with water-blocking tapes to form an optical cable unit. The electrical cable unit arranges a plurality of power lines in a metal armor tube to form a cable unit. The optical cable unit and the electrical cable unit are coated with a flame-retardant sheath to form an optoelectronic composite cable. The composite cable winds the reinforcements outside the optical cable loose tube, so that the composite cable also has the function of an armor layer, thereby saving space.

Description

Technical Field

[0001] The invention relates to a micro-beam flat mouse-proof photoelectric composite cable, a production mould and a production method, and belongs to the technical field of photoelectric composite cables. Background Art

[0002] Optical-electric composite cable is an advanced transmission medium that combines optical fiber and power transmission copper wire. It is mainly used in communication access network systems and can simultaneously solve the equipment power supply and signal access problems of base stations. Due to its unique structure, this cable has a wide range of applications in multiple fields, especially in scenarios where electrical energy and optical signals need to be transmitted simultaneously.

[0003] In certain usage environments, optoelectronic composite cables need to be equipped with reinforcement members to increase their strength. For example, patent 202411050249.3 discloses an environmentally friendly, highly flame-retardant optoelectronic composite cable. The optoelectronic composite cable has independent reinforcement members arranged in the cable core, which occupies the cable core space. At the same time, in order to make the composite cable have a rodent-proof function, it is also necessary to add an armor layer outside the optical cable, which further compresses the space of the optical fiber and reduces the optical fiber capacity under the limited cable size. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a micro-bundle flat rodent-proof photoelectric composite cable which combines a reinforcement member with an optical cable armor layer to reduce the size of the composite cable.

[0005] In order to achieve the above-mentioned purpose, the technical scheme proposed by the present invention is as follows: a micro-beam flat rat-proof optoelectronic composite cable, comprising an optical cable unit and an electrical cable unit, the optical cable unit comprising an optical fiber unit, a plurality of optical fiber units are arranged in a micro-beam tube, a plurality of micro-beam tubes are spirally twisted in a loose tube, the loose tube is filled with fiber paste, the loose tube is coated with a plurality of spirally wound metal reinforcements, the plurality of metal reinforcements are coated with a water-blocking tape, forming an optical cable unit; the electrical cable unit comprises a power line, a plurality of power lines are arranged in a metal armor tube, forming a cable unit; the optical cable unit and the electrical cable unit are coated with a flame-retardant sheath, forming an optoelectronic composite cable.

[0006] A further design of the above technical solution is as follows: the micro beam tube adopts a double-layer structure, the inner layer is polycarbonate plastic, and the outer layer is polybutylene terephthalate.

[0007] The micro-bundle tube is filled with water-blocking yarn.

[0008] The optical cable unit and the electrical cable unit are arranged side by side, so that the flame retardant sheath is flat.

[0009] There are two cable units, which are symmetrically arranged on both sides of the optical cable unit.

[0010] The flame retardant sheath is embedded with a mica tape.

[0011] The middle part of the mica tape is a straight line segment, and both ends are arc segments bent to the same side.

[0012] The mica tapes are provided with two symmetrically arranged ones, the arc segments of the two mica tapes are bent inwards, and the optical cable unit and the electrical cable unit are located on the inner sides of the two mica tapes.

[0013] A production mold for the above-mentioned micro-bundle flat rat-proof optoelectronic composite cable comprises a mold core and a mold sleeve whose center lines are on the same straight line, the mold sleeve is sleeved on the outside of the mold core, the mold core is provided with mold holes for molding optical cable units, electrical cable units and mica tapes, and the mold sleeve is provided with mold holes for molding flame-retardant sheaths.

[0014] A method for producing the above-mentioned micro-beam flat rodent-proof photoelectric composite cable comprises: Take a number of optical fiber units, use polycarbonate plastic and polybutylene terephthalate material to extrude micro-bundle tubes outside the optical fiber units by double-layer co-extrusion process, and fill the micro-bundle tubes with water-blocking yarn; Take a number of micro-bundle tubes, use a twisting cage pay-off machine, use a spiral twisting process to twist the micro-bundle tubes, use an extruder to extrude loose tubes outside the twisted micro-bundle tubes, and fill the loose tubes with fiber paste; The loose tube, metal reinforcement, mica tape and armored power cord are laid out by a pay-off machine and passed through a mold core to form an optical cable unit, an electrical cable unit and a mica tape. An extruder and a mold sleeve are used to extrude a flame-retardant sheath to wrap the optical cable unit, the electrical cable unit and the mica tape.

[0015] The beneficial effects of the present invention are: The present invention wraps the independently arranged reinforcement member in the prior art around the loose tube of the optical cable, so that it also has the function of the armor layer, thus eliminating the space for the original independent reinforcement member, and making the size of the composite cable smaller under the same performance; the outer metal reinforcement member can ensure the tensile and compressive properties of the composite cable; when the outer sheath is broken by being bitten by mice, the cable core is coated with a high-density metal reinforcement member, which can effectively protect the communication unit. In addition, the armor layer of the prior art is mostly a tubular structure, which is sleeved outside the optical cable, is not tightly connected to the optical cable, and is easy to loosen. The metal reinforcement member of the present invention uses a spiral twisting method, and is tightly connected to the optical fiber micro-bundle tube with high density, and has better mechanical tensile properties.

[0016] In the present invention, the optical fiber unit is placed in the micro-beam tube through a spiral twisting process. The micro-beam tube adopts a dry process, has a small size and a thin wall thickness, and effectively reduces the outer diameter. At the same time, the micro-beam tube adopts a mulberry layer co-extrusion process to form a double-layer structure. The inner layer material can improve the rigidity and avoid bending and damaging the optical fiber during the production process. The outer layer material can effectively avoid the risk of cracking caused by the temperature difference between the micro-beam tube in the morning and evening.

[0017] Through the above two structures, the present invention saves space for independent reinforcement members and provides more space for optical fibers. On the other hand, the optical fiber packaging density of the microtube optical cable is higher, so it can better meet the requirements of communication networks for large-capacity and high-density transmission.

[0018] In the present invention, one cable has the functions of optical signal transmission and power supply at the same time, which reduces the complexity and cost of wiring and avoids the trouble of laying optical cables and electrical cables in the same area. The composite cable is large-capacity, lightweight, high-tensile strength, heat-resistant, rodent-proof, and highly flame-retardant. It is suitable for a variety of special construction scenarios, reduces the construction cost of optical cables, increases the service life of optical cables, and reduces the maintenance cost of cable communications in the later stage. It is the development trend of future optical cable construction and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic cross-sectional view of the composite cable of the present invention; Figure 2 Schematic diagram of the mold core in the present invention; Figure 3 This is the flow chart of the loose tube production line; Figure 4 This is the flow chart of the composite cable production line.

[0020] In the figure: 1-flame retardant sheath, 2-mica tape, 3-water blocking tape, 4-metal reinforcement, 5-metal armor tube, 6-loose tube, 7-power cord, 8-fiber paste, 9-optical fiber unit. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1

[0022] like Figure 1 As shown, the micro-bundle flat rodent-proof optoelectronic composite cable of this embodiment includes an optical cable unit and an electrical cable unit.

[0023] Among them, the optical cable unit arranges several optical fiber units 9 in a micro-beam tube. The micro-beam tube is made of a double-layer structure using a double-layer co-extrusion process. The inner layer is polycarbonate plastic and the outer layer is polybutylene terephthalate. The micro-beam tube is filled with water-blocking yarn to form a dry structure.

[0024] Several micro-bundles 9 are twisted in a spiral in a loose tube 6 (PBT tube), which is filled with fiber paste 8 to protect the tube's tensile and compressive properties; the loose tube 6 is covered with several spirally wound metal reinforcements 4, which are covered with water blocking tape 3 to form an optical cable unit. The metal reinforcements 4 are twisted in a spiral manner and are tightly attached to the optical fiber micro-bundle tubes at a high density. This type of optical cable has excellent mechanical tensile properties and is suitable for outdoor laying, aerial, and deep burial.

[0025] The cable unit arranges several power lines 7 in a metal armor tube 5 to form a cable unit; the optical cable unit and the cable unit are covered with a flame retardant sheath 1, and a mica tape 2 is embedded in the flame retardant sheath 1, thereby forming an optoelectronic composite cable.

[0026] In this embodiment, the optical cable unit and the electrical cable unit are arranged side by side, and the two cable units are symmetrically arranged on both sides of the optical cable unit, so that the cross-section of the flame retardant sheath 1 is a flat waist-shaped circle. This shape structure occupies a small space, and the flat shape design makes it convenient to wire in a narrow space, such as in the weak current well of a building, pipelines and other areas with limited space, which is more advantageous than traditional round cables.

[0027] A mica tape 2 is embedded in the flame retardant sheath 1. The mica tape 2 matches the shape of the flame retardant sheath 1. The middle part is a straight line segment, and the two ends are arc segments bent to the same side. The mica tape 2 is provided with two symmetrically arranged arc segments of the two mica tapes 2 are bent inward, so that the optical cable unit and the electrical cable unit are located on the inner side of the two mica tapes 2. The mica tape 2 can further promote the flame retardant performance and tensile strength of the optical cable.

[0028] The composite cable of this embodiment is particularly suitable for the construction of communication networks of communication operators such as China Telecom, China Mobile, and China Unicom. It is used for connection between base stations, computer rooms and other equipment to achieve high-speed data transmission and equipment power supply. It can also be used in the integrated wiring system of intelligent buildings to connect various intelligent devices, such as surveillance cameras, access control systems, intelligent lighting equipment, etc., to achieve communication and power supply scenarios between devices. Embodiment 2

[0029] This embodiment provides a production mold for a micro-bundle flat rodent-proof photoelectric composite cable as in the first embodiment. Figure 2 As shown, it includes a mold core and a mold sleeve whose center lines are in the same straight line, the mold sleeve is sleeved on the outside of the mold core, and the mold core is provided with mold holes for molding optical cable units, cable units and mica tapes, and two mold holes for molding cable units are symmetrically arranged on both sides of the mold hole for molding optical cable units, and the three mold holes are arranged side by side, and the mold holes for molding mica tapes are symmetrically arranged on both sides of the above three mold holes. The mold sleeve is provided with a flat waist-shaped mold hole for molding a flame-retardant sheath. Embodiment 3

[0030] This embodiment provides a method for producing a micro-bundle flat rodent-proof photoelectric composite cable as in Embodiment 1, comprising: Take a number of optical fiber units, use polycarbonate plastic and polybutylene terephthalate material to extrude micro-bundle tubes outside the optical fiber units by double-layer co-extrusion process, and fill the micro-bundle tubes with water-blocking yarn; Take some microtubes and use Figure 3The production line shown uses a cage pay-off machine to twist several micro-bundle tubes by spiral twisting process, and uses an extruder to extrude loose tubes outside the twisted micro-bundle tubes, and fills the loose tubes with fiber paste, and then passes through a water tank, a blow dryer, a dancer, etc. under the action of a traction machine and a take-up machine to form a loose tube structure with a large number of cores; use Figure 4 The production line shown in the figure uses a pay-off machine to pay off the loose tube, metal reinforcement, mica tape and armored power cord respectively and passes through the mold core described in Example 2 to form an optical cable unit, an electrical cable unit and a mica tape, wherein the metal reinforcement is also spirally wound through a twisting mechanism, so that a layer of spirally wound metal reinforcement is coated on the surface of the loose tube, and then an extruder and a mold sleeve are used to extrude to form a flame retardant sheath, which wraps the optical cable unit, the electrical cable unit and the mica tape, and then under the action of a traction machine and a take-up machine, it passes through a water tank, a blow dryer, etc. to form a final composite cable.

[0031] The technical solutions of the present invention are not limited to the above-mentioned embodiments, and any technical solutions obtained by equivalent replacement methods fall within the scope of protection required by the present invention.

Claims

1. A micro-beam flat rodent-proof photoelectric composite cable, comprising an optical cable unit and an electrical cable unit, characterized in that: The optical cable unit comprises an optical fiber unit, a plurality of optical fiber units are arranged in a micro-bundle, a plurality of micro-bundles are spirally twisted in a loose tube, the loose tube is filled with fiber paste, the loose tube is coated with a plurality of spirally wound metal reinforcements, and the plurality of metal reinforcements are coated with a water blocking tape to form an optical cable unit; The cable unit includes a power line, and a plurality of power lines are arranged in a metal armor tube to form a cable unit; The optical cable unit and the electrical cable unit are covered with a flame retardant sheath to form an optoelectronic composite cable.

2. According to claim 1, the micro-beam flat rodent-proof photoelectric composite cable is characterized in that: The micro beam tube adopts a double-layer structure, the inner layer is polycarbonate plastic, and the outer layer is polybutylene terephthalate.

3. The micro-beam flat rodent-proof photoelectric composite cable according to claim 2 is characterized in that: The micro-bundle tube is filled with water-blocking yarn.

4. The micro-bundle flat rodent-proof photoelectric composite cable according to claim 3 is characterized in that: The optical cable unit and the electrical cable unit are arranged side by side, so that the flame retardant sheath is flat.

5. The micro-beam flat rodent-proof photoelectric composite cable according to claim 4, characterized in that: There are two cable units, which are symmetrically arranged on both sides of the optical cable unit.

6. The micro-bundle flat rodent-proof photoelectric composite cable according to any one of claims 1 to 5, characterized in that: The flame retardant sheath is embedded with a mica tape.

7. The micro-bundle flat rodent-proof photoelectric composite cable according to claim 6, characterized in that: The middle part of the mica tape is a straight line segment, and both ends are arc segments bent to the same side.

8. The micro-bundle flat rodent-proof photoelectric composite cable according to claim 7, characterized in that: The mica tapes are provided with two symmetrically arranged ones, the arc segments of the two mica tapes are bent inwards, and the optical cable unit and the electrical cable unit are located on the inner sides of the two mica tapes.

9. A production mold for the micro-bundle flat rodent-proof photoelectric composite cable according to claim 7 or 8, characterized in that: The mold core comprises a mold core and a mold sleeve whose center lines are in the same straight line. The mold sleeve is sleeved on the outside of the mold core. The mold core is provided with mold holes for molding optical cable units, electrical cable units and mica tapes. The mold sleeve is provided with mold holes for molding flame-retardant sheaths.

10. A method for producing the micro-bundle flat rodent-proof photoelectric composite cable according to claim 7 or 8, characterized in that: Take a number of optical fiber units, use polycarbonate plastic and polybutylene terephthalate material to extrude micro-bundle tubes outside the optical fiber units by double-layer co-extrusion process, and fill the micro-bundle tubes with water-blocking yarn; Take a number of micro-bundle tubes, use a twisting cage pay-off machine, use a spiral twisting process to twist the micro-bundle tubes, use an extruder to extrude loose tubes outside the twisted micro-bundle tubes, and fill the loose tubes with fiber paste; The loose tube, metal reinforcement, mica tape and armored power cord are laid out by a pay-off machine and passed through a mold core to form an optical cable unit, an electrical cable unit and a mica tape. An extruder and a mold sleeve are used to extrude a flame-retardant sheath to wrap the optical cable unit, the electrical cable unit and the mica tape.

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