Photoelectric combination cable capable of enhancing electromagnetic shielding effect

Abstract

The invention relates to the technical field of cable manufacturing, in particular to a photoelectric combination cable for enhancing an electromagnetic shielding effect, which comprises a flat outer sheath, two transverse coaxial cable cores symmetrically arranged at two ends in the outer sheath, and two longitudinal coaxial optical cable cores symmetrically arranged in the middle in the outer sheath, and the cable core and the optical cable core which are positioned on the same side are jointly coated by a reinforced shielding layer. According to the photoelectric combination cable, the interior of the cable is designed to be of an amorphous structure, a good electromagnetic shielding effect is achieved, meanwhile, good flame retardant performance, wear resistance and pressure resistance are achieved, practicability is high, and the photoelectric combination cable can be used in the high electromagnetic interference and severe environment.

Description

Technical Field

[0001] The invention relates to the technical field of cable manufacturing, and in particular to a photoelectric combination cable with enhanced electromagnetic shielding effect. Background Art

[0002] Optoelectronic combination cable is a composite cable that integrates optical fiber and copper conductor. It combines the high-speed data transmission capability of optical fiber and the power transmission function of copper conductor. This cable is usually used in data centers, security monitoring, intelligent transportation systems and other application scenarios that require simultaneous transmission of data and power. In some areas with complex electromagnetic environments, the requirements for the anti-electromagnetic interference capability of optoelectronic combination cables are very high, while general optoelectronic combination cables do not perform well in anti-electromagnetic interference.

[0003] Common methods to avoid electromagnetic interference include: increasing the distance from the electromagnetic interference source, adding shielding materials to the outside of the cable, adding shielding materials to the inside of the cable, etc. The shielding material added externally is usually a copper-clad shielding mesh, which is installed as a whole on the outside of the cable. Although this measure can have a certain effect, the overall effect is general and the application is relatively limited. It is difficult to achieve a good electromagnetic shielding effect for some non-standard cables; the shielding material added internally is generally doped with shielding aids. At present, the research and development of shielding aids and their compatibility with the entire cable, especially the compatibility with optoelectronic combination cables, still need further research.

[0004] The invention patent with the patent publication number CN108831618A discloses a highly shielded and impact-resistant medical optoelectronic composite cable, including a cable core and an inner sheath, an outer shielding layer, an armor layer and an outer sheath sequentially coated on the outer side of the cable core. The cable is provided with an outer shielding layer on the outer side of the cable core, and an inner shielding layer is also provided in the signal unit, which double-shields signal interference, has high reliability and good stability. However, the shielding layer used in this method is relatively conventional, and the effect needs to be improved when used for optoelectronic composite cables. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an optoelectronic combination cable with enhanced electromagnetic shielding effect, comprising a flat outer sheath, two transverse coaxial cable cores symmetrically arranged at both ends of the inner part of the outer sheath, and two longitudinal coaxial optical cable cores symmetrically arranged in the middle part of the outer sheath;

[0006] The cable core and the optical cable core located on the same side are jointly covered by a reinforced shielding layer, a reinforced fixing wire is provided between the cable core and the optical cable core located on the same side, the reinforced fixing wire squeezes the reinforced shielding layer inwardly so that the reinforced fixing wire is located between the cable core and the optical cable core, and an auxiliary fixing layer is provided between the two reinforced shielding layers;

[0007] The materials of the reinforced shielding layer include, by weight: 25-30 parts of phenolic resin, 1-2 parts of carbon fiber, 2-3 parts of boron nitride, 0.5-2.5 parts of silicon carbide whiskers, and 5-8 parts of modified glass fiber.

[0008] Furthermore, the outer sheath comprises a chlorinated polyethylene sheath located on the outermost side, and an EPDM rubber-based composite liner located on the inner side of the chlorinated polyethylene sheath.

[0009] Note: By optimizing the material of the outer sheath, the external structural strength of the optoelectronic combination cable is ensured, and a certain wear resistance is guaranteed.

[0010] Furthermore, the raw material components and contents of the EPDM-based composite lining include, by mass percentage, 2-5% carbon fiber, 10-20% aluminum nitride powder, and the balance being liquid EPDM.

[0011] Description: By optimizing the material of the EPDM rubber-based composite lining, it has a certain electromagnetic shielding effect, thereby improving the overall electromagnetic shielding performance of the combined cable.

[0012] Furthermore, the cable core includes an outermost polyurethane foam sheath, a first steel belt armor layer located inside the polyurethane foam sheath, and an oxygen-free copper conductor located inside the first steel belt armor layer.

[0013] Note: By optimizing the composition material of the cable core, its structural strength is improved to adapt to the overall structure of the optoelectronic combination cable.

[0014] Furthermore, the optical cable core includes an outermost polybutylene terephthalate sheath, a second steel tape armor layer located inside the polybutylene terephthalate sheath, and an optical fiber located inside the second steel tape armor layer.

[0015] Description: By optimizing the composition materials of the optical cable core, its structural strength is improved to adapt to the overall structure of the optoelectronic combination cable.

[0016] Furthermore, the material of the reinforcing fixing line includes, by weight, 7 to 11 parts of epoxy resin and 2 to 6 parts of modified glass fiber; the material of the auxiliary fixing layer includes, by weight, 7 to 11 parts of epoxy resin and 1 to 4 parts of modified glass fiber; an auxiliary fixing line is provided at each end of the auxiliary fixing layer, and the auxiliary fixing line is in contact with the inside of the outer sheath.

[0017] Description: By providing a reinforcing fixing line and an auxiliary fixing layer, the structural strength of the optoelectronic combination cable of the present invention is guaranteed. Combined with the amorphous reinforced shielding layer, it can have good compressive and tensile structural strength while having efficient electromagnetic shielding.

[0018] Furthermore, the preparation method of the modified glass fiber is: placing S4 grade high-strength glass fiber in an oven at 550-600°C for heat treatment for 2-3 hours, then mixing a palmitic acid solution with a mass concentration of 40% with anhydrous ethanol in a mass ratio of 10-15:100 to obtain a modified liquid, completely immersing the heat-treated S4 grade high-strength glass fiber in the modified liquid, heating to 42-45°C and soaking for 1-2 hours, taking out and drying to obtain the modified glass fiber.

[0019] Description: By optimizing the design of the components of the modified glass fiber, it has good structural strength and electromagnetic shielding effect. The modified S4 grade high-strength glass fiber has low carbon content, good pressure resistance and tensile strength. At the same time, it can play a good electromagnetic shielding effect when combined with other materials in the reinforced shielding layer. It is used in the reinforced shielding layer, the reinforced fixing line and the auxiliary fixing layer respectively. By adjusting the dosage to achieve different purposes, the optoelectronic combination cable of the present invention has a good electromagnetic shielding effect.

[0020] Furthermore, the preparation method of the optoelectronic combination cable is:

[0021] S1. Preparation of cable core: using an extruder to co-extrude the raw materials of the cable core to obtain a linear cable core;

[0022] S2, preparing the optical cable core: using an extruder to co-extrude the raw materials of the optical cable core to obtain a linear optical cable core;

[0023] S3, preparation of the reinforced shielding layer: placing the raw materials of the reinforced shielding layer together in a mixer, stirring and mixing at 45-50° C. for 0.5-1 h, with a stirring speed of 200-300 rpm, and then extruding and granulating the mixed product through a twin-screw extruder to obtain a strip-shaped reinforced shielding layer, with an extrusion temperature of 150-200° C.;

[0024] S4, preparation of the reinforcing fixing wire: using an extruder to co-extrude the raw materials of the reinforcing fixing wire to obtain a linear reinforcing fixing wire;

[0025] S5, preparing the auxiliary fixing layer: using an extruder to co-extrude the raw materials of the auxiliary fixing layer to obtain a layered auxiliary fixing layer;

[0026] S6. Co-extrusion molding: The cable core, the optical cable core, the reinforced shielding layer, the reinforced fixing wire and the auxiliary fixing layer are placed symmetrically in pairs and parallel to each other, wherein the reinforced fixing wire squeezes the reinforced shielding layer inward so that the reinforced fixing wire is located between the cable core and the optical cable core, and the auxiliary fixing layer is placed between the two reinforced shielding layers and arranged closely, and then the outer sheath is co-extruded on the outer periphery to obtain an optoelectronic combination cable, and the line output speed is 1 to 2 m / min.

[0027] Description: By optimizing the preparation method of the optoelectronic combination cable of the present invention, a tight and firm combination between its components can be achieved.

[0028] Furthermore, in S6, when co-extrusion molding is performed, the outside of the reinforced shielding layer is continuously steam-cured through a continuous vulcanization pipeline with water vapor balance, and the steam vulcanization pressure is controlled at 0.6-0.8 MPa. The relationship between the steam vulcanization time t and the steam vulcanization temperature T is as follows:

[0029]

[0030] In the formula, K is a constant, which is 2.3; T 1 The lowest steam vulcanization temperature is 120-140℃; t 1 is the steam vulcanization time corresponding to the lowest steam vulcanization temperature, which is 20 minutes; T 2 The preset steam vulcanization temperature is 160-180℃; t 2 It is the steam vulcanization time corresponding to the preset steam vulcanization temperature.

[0031] Description: By optimizing and adjusting the preparation parameters for the unique reinforced shielding layer material of the present invention, a selection formula for the steam vulcanization temperature and time in the preparation process is provided, thereby achieving efficient and stable production.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The optoelectronic combination cable with enhanced electromagnetic shielding effect of the present invention designs the interior of the cable as an amorphous structure, and adds a series of anti-electromagnetic shielding effect layer belts or wires between each structural layer, thereby forming an optoelectronic combination cable with high-strength shielding effect, wherein the components of the modified glass fiber are optimized and designed to have good structural strength and electromagnetic shielding effect, and are respectively used in the reinforced shielding layer, the reinforced fixing wire and the auxiliary fixing layer. By adjusting the dosage to achieve different purposes of use, the optoelectronic combination cable of the present invention has good electromagnetic shielding effect, and at the same time has good flame retardant performance and wear and pressure resistance performance, is highly practical, and can be used in high electromagnetic interference and harsh environments.

[0034] (2) The present invention provides a photoelectric combination cable with enhanced electromagnetic shielding effect and a specific preparation method thereof. Due to the amorphous internal structure, there is a gap between the outer sheath of the cable and the reinforced shielding layer. The outer sheath is prone to generate bubbles or bursts during the extrusion process. Therefore, during production, a continuous vulcanization production line with water vapor balance is selected as the equipment, the steam pressure is optimized and adjusted, and the most appropriate temperature-time relationship formula is selected, so that the temperature inside and outside the cable is uniform, avoiding the generation of bubbles and bursts, and the final structural strength is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional view of an optoelectronic combined cable with enhanced electromagnetic shielding effect according to the present invention;

[0036] Figure 2 is a schematic diagram of a cable electromagnetic interference simulation model of a control group 1 in an experimental example of the present invention;

[0037] Figure 3 is a schematic diagram of a cable electromagnetic interference simulation model of a control group 2 in an experimental example of the present invention;

[0038] Figure 4 is a schematic diagram of a cable electromagnetic interference simulation model of a control group 3 in an experimental example of the present invention;

[0039] Figure 5 It is a schematic diagram of the cable electromagnetic interference simulation model of Example 10 in the experimental example of the present invention.

[0040] In the figure: 1-outer sheath, 11-chlorinated polyethylene sheath, 12-ethylene propylene rubber-based composite lining, 2-cable core, 21-polyurethane foam sheath, 22-first steel belt armor layer, 23-oxygen-free copper conductor, 3-optical cable core, 31-polybutylene terephthalate sheath, 32-second steel belt armor layer, 33-optical fiber, 4-reinforced shielding layer, 5-reinforced fixing wire, 6-auxiliary fixing layer, 61-auxiliary fixing wire. DETAILED DESCRIPTION

[0041] In order to further illustrate the method and effect of the present invention, the technical solution of the present invention will be clearly and completely described in combination with experiments.

[0042] Embodiment 1: This embodiment describes an optoelectronic combined cable with enhanced electromagnetic shielding effect, comprising a flat outer sheath 1, two transverse coaxial cable cores 2 symmetrically arranged at both ends of the inner portion of the outer sheath 1, and two longitudinal coaxial optical cable cores 3 symmetrically arranged in the middle portion of the outer sheath 1;

[0043] The outer sheath 1 includes a chlorinated polyethylene sheath 11 located at the outermost side, and an EPDM-based composite liner 12 located inside the chlorinated polyethylene sheath 11. The raw material components and contents of the EPDM-based composite liner 12 are calculated by mass percentage, including 3% carbon fiber, 15% aluminum nitride powder, and the balance is liquid EPDM;

[0044] The cable core 2 includes an outermost polyurethane foam sheath 21, a first steel tape armor layer 22 located inside the polyurethane foam sheath 21, and an oxygen-free copper conductor 23 located inside the first steel tape armor layer 22. The optical cable core 3 includes an outermost polybutylene terephthalate sheath 31, a second steel tape armor layer 32 located inside the polybutylene terephthalate sheath 31, and an optical fiber 33 located inside the second steel tape armor layer 32.

[0045] The cable core 2 and the optical cable core 3 on the same side are covered together by a reinforced shielding layer 4, a reinforced fixing wire 5 is provided between the cable core 2 and the optical cable core 3 on the same side, the reinforced fixing wire 5 squeezes the reinforced shielding layer 4 inwardly so that the reinforced fixing wire 5 is located between the cable core 2 and the optical cable core 3, and an auxiliary fixing layer 6 is provided between the two reinforced shielding layers 4;

[0046] The materials of the reinforced shielding layer 4 are calculated by weight, including: 27 parts of phenolic resin, 1.5 parts of carbon fiber, 2.5 parts of boron nitride, 1.5 parts of silicon carbide whiskers, and 6 parts of modified glass fiber;

[0047] The material of the reinforcing fixing line 5 is calculated by weight, including: 8 parts of epoxy resin and 4 parts of modified glass fiber. The material of the auxiliary fixing layer 6 is calculated by weight, including: 8 parts of epoxy resin and 2 parts of modified glass fiber. An auxiliary fixing line 61 is provided at each end of the auxiliary fixing layer 6, and the auxiliary fixing line 61 is in contact with the inside of the outer sheath 1.

[0048] The preparation method of the modified glass fiber is as follows: placing the S4 grade high-strength glass fiber in a 580°C oven for heat treatment for 2.5 hours, then mixing a palmitic acid solution with a mass concentration of 40% with anhydrous ethanol in a mass ratio of 12:100 to obtain a modification liquid, completely immersing the heat-treated S4 grade high-strength glass fiber in the modification liquid, heating to 43°C and soaking for 1.5 hours, taking out and drying to obtain the modified glass fiber.

[0049] Example 2: This example is different from Example 1 in that the raw material components and contents of the EPDM rubber-based composite liner 12 are expressed in percentage by mass and include 2% carbon fiber, 10% aluminum nitride powder, and the remainder is liquid EPDM rubber.

[0050] Example 3: This example is different from Example 1 in that the raw material components and contents of the EPDM rubber-based composite liner 12 are expressed in percentage by mass and include 5% carbon fiber, 20% aluminum nitride powder, and the remainder is liquid EPDM rubber.

[0051] Embodiment 4: This embodiment is different from Embodiment 1 in that the material of the reinforced shielding layer 4 comprises, by weight, 25 parts of phenolic resin, 1 part of carbon fiber, 2 parts of boron nitride, 0.5 parts of silicon carbide whisker, and 5 parts of modified glass fiber.

[0052] Embodiment 5: This embodiment is different from Embodiment 1 in that the material of the reinforced shielding layer 4 comprises, by weight, 30 parts of phenolic resin, 2 parts of carbon fiber, 3 parts of boron nitride, 2.5 parts of silicon carbide whiskers, and 8 parts of modified glass fiber.

[0053] Example 6: This example is different from Example 1 in that the material of the reinforcing fixing line 5, measured by weight, includes: 7 parts of epoxy resin and 2 parts of modified glass fiber, and the material of the auxiliary fixing layer 6, measured by weight, includes: 7 parts of epoxy resin and 1 part of modified glass fiber.

[0054] Example 7: This example is different from Example 1 in that the material of the reinforcing fixing line 5, measured in parts by weight, includes: 11 parts of epoxy resin and 6 parts of modified glass fiber; the material of the auxiliary fixing layer 6, measured in parts by weight, includes: 11 parts of epoxy resin and 4 parts of modified glass fiber.

[0055] Note: The reinforcing fixing wire 5 and the auxiliary fixing layer 6 mainly play the role of auxiliary fixing, and secondly can play the role of auxiliary electromagnetic shielding. Therefore, it is necessary to ensure their strength first, while also having a certain electromagnetic shielding effect. Therefore, the amount of modified glass fiber added is controlled at an appropriate level.

[0056] Example 8: The difference between this example and Example 1 is that the preparation method of the modified glass fiber is as follows: S4 grade high-strength glass fiber is placed in an oven at 550°C for heat treatment for 2 hours, and then a palmitic acid solution with a mass concentration of 40% is mixed with anhydrous ethanol in a mass ratio of 10:100 to obtain a modified liquid, and the heat-treated S4 grade high-strength glass fiber is completely immersed in the modified liquid, the temperature is raised to 42°C and soaked for 1 hour, and then taken out and dried to obtain the modified glass fiber.

[0057] Example 9: The difference between this example and Example 1 is that the preparation method of the modified glass fiber is as follows: S4 grade high-strength glass fiber is placed in an oven at 600°C for heat treatment for 3 hours, and then a palmitic acid solution with a mass concentration of 40% is mixed with anhydrous ethanol in a mass ratio of 15:100 to obtain a modified liquid, and the heat-treated S4 grade high-strength glass fiber is completely immersed in the modified liquid, the temperature is raised to 45°C and soaked for 2 hours, and then taken out and dried to obtain the modified glass fiber.

[0058] Embodiment 10: This embodiment is a method for preparing an optoelectronic combination cable with enhanced electromagnetic shielding effect according to Embodiment 1, comprising the following steps:

[0059] S1, preparation of cable core 2: using an extruder to extrude the raw materials of the cable core 2 together to obtain a linear cable core 2;

[0060] S2, preparation of the optical cable core 3: using an extruder to co-extrude the raw materials of the optical cable core 3 to obtain a linear optical cable core 3;

[0061] S3, preparation of the reinforced shielding layer 4: the raw materials of the reinforced shielding layer 4 are placed in a mixer, stirred and mixed at 46° C. for 0.75 h, with a stirring speed of 250 rpm, and then the mixed product is extruded and granulated by a twin-screw extruder to obtain a strip-shaped reinforced shielding layer 4, and the extrusion temperature is 180° C.;

[0062] S4, preparation of the reinforcing fixing wire 5: using an extruder to extrude the raw materials of the reinforcing fixing wire 5 together to obtain a linear reinforcing fixing wire 5;

[0063] S5, preparation of the auxiliary fixing layer 6: using an extruder to co-extrude the raw materials of the auxiliary fixing layer 6 to obtain a layered auxiliary fixing layer 6;

[0064] S6, co-extrusion molding: the cable core 2, the optical cable core 3, the reinforced shielding layer 4, the reinforced fixing wire 5 and the auxiliary fixing layer 6 are placed symmetrically in pairs and parallel to each other, wherein the reinforced fixing wire 5 squeezes the reinforced shielding layer 4 inwardly so that the reinforced fixing wire 5 is located between the cable core 2 and the optical cable core 3, and the auxiliary fixing layer 6 is placed between the two reinforced shielding layers 4 and arranged closely, and then the outer sheath 1 is co-extruded on the periphery to obtain the optoelectronic combination cable, and the outlet speed is 1.5m / min. During the co-extrusion molding, the outer part of the reinforced shielding layer 4 is continuously steam-cured through a continuous vulcanization pipeline with water vapor balance, and the steam vulcanization pressure is controlled at 0.7MPa. The relationship between the steam vulcanization time t and the steam vulcanization temperature T is as follows:

[0065]

[0066] In the formula, K is a constant, which is 2.3; T 1 is the minimum steam vulcanization temperature, which is 130°C; t 1 is the steam vulcanization time corresponding to the lowest steam vulcanization temperature, which is 20 minutes; T 2 The preset steam vulcanization temperature is 170℃; t 2 It is the steam vulcanization time corresponding to the preset steam vulcanization temperature.

[0067] Example 11: The difference between this example and Example 10 is that, S3, preparation of the reinforced shielding layer 4: the raw materials of the reinforced shielding layer 4 are placed together in a mixer, stirred and mixed at 45°C for 0.5h, the stirring speed is 200rpm, and then the mixed product is extruded and granulated through a twin-screw extruder to obtain a strip-shaped reinforced shielding layer 4, and the extrusion temperature is 150°C.

[0068] Example 12: The difference between this example and Example 10 is that, S3, preparation of the reinforced shielding layer 4: the raw materials of the reinforced shielding layer 4 are placed together in a mixer, stirred and mixed at 50°C for 1 hour, the stirring speed is 300 rpm, and then the mixed product is extruded and granulated through a twin-screw extruder to obtain a strip-shaped reinforced shielding layer 4, and the extrusion temperature is 200°C.

[0069] Example 13: This example is different from Example 10 in that the line speed in S6 and co-extrusion is 1 m / min. During co-extrusion, the outer part of the reinforced shielding layer 4 is continuously steam-cured through a continuous vulcanization pipeline with water vapor balance. The steam vulcanization pressure is controlled at 0.6 MPa, T 1 is the minimum steam vulcanization temperature, which is 120°C; T 2 The preset steam vulcanization temperature is 160°C.

[0070] Example 14: This example is different from Example 10 in that the line speed in S6 and co-extrusion is 2 m / min. During co-extrusion, the outer part of the reinforced shielding layer 4 is continuously steam-cured through a continuous vulcanization pipeline with water vapor balance. The steam vulcanization pressure is controlled at 0.8 MPa, T 1 is the minimum steam vulcanization temperature, which is 140°C; T 2 The preset steam vulcanization temperature is 180°C.

[0071] Experimental Example: The description of this experimental example is based on the scheme described in Example 10, and is intended to illustrate the practical application effect of the present invention.

[0072] 1. Experimental design: In order to illustrate the electromagnetic shielding performance of an optoelectronic combination cable with enhanced electromagnetic shielding effect prepared by the present invention, the following experimental groups are designed:

[0073] Control group 1: No reinforced shielding layer 4 is provided, and the outer sheath 1 directly covers the cable core 2;

[0074] Control group 2: directly wrap the outer sheath 1 with the reinforced shielding layer 4 and then wrap the cable core 2;

[0075] Control group 3: The reinforced shielding layer 4 was replaced with a commercially available general electromagnetic shielding layer aluminum-plastic composite tape, and the reinforced fixing wire 5 and the auxiliary fixing layer 6 were replaced with general rubber;

[0076] 2. Related performance experiments: The cables in control groups 1 to 3 and Example 10 were tested for electromagnetic interference. Interference transmitting cables were placed next to each cable. The calculated frequency range was 1 to 250 MHz. The interference voltage loaded on the transmitting cable was fixed at 1 V. The actual performance of the present invention under different experimental conditions was compared. The cable length was 3 m. The results were as follows: Figures 2 to 4 shown.

[0077] First, the control group 1, such as Figure 2 As shown, it can be seen that without enhanced electromagnetic shielding, the voltage coupling value of the cable under the interference signal of the three bands is relatively high, with an average value of 0.01V. This is mainly because it is close to the transmitting cable and the coupling effect is strong. If shielding measures are not taken, it will have a serious interference effect on the equipment corresponding to the cable in the control group 1.

[0078] The second is the control group 2, such as Figure 3 As shown, it can be seen that after adding the enhanced shielding layer 4, the voltage coupling value of the cable under the interference signal of the three bands is reduced, and the average interference signal amplitude is 35.5μV, indicating that the addition of the enhanced shielding layer 4 can achieve a good electromagnetic shielding effect;

[0079] The second is control group 3, such as Figure 4 As shown, it can be seen that by using the commercially available electromagnetic shielding aluminum-plastic composite tape combined with the internal structure of the optoelectronic combination cable of the present invention, a certain electromagnetic shielding effect can be achieved, but the overall effect is not as good as that of the control group 2 and the embodiment 10;

[0080] Finally, embodiment 10 is as follows. Figure 5 As shown, it can be seen that by adopting the reinforced shielding layer 4 of the present invention and improving the internal structure, the electromagnetic shielding effect is greatly enhanced, the voltage coupling value of the cable under the interference signal of the three bands is the lowest, and a better electromagnetic shielding effect can be achieved.

[0081] Then we tested other properties of the optoelectronic composite cables in Control Group 3 and Example 10, mainly testing their tensile strength, elongation at break and bending strength. The specific data are shown in Table 1.

[0082] Table 1 Structural strength test of optoelectronic composite cables in control group 3 and embodiment 10

[0083]

[0084] It can be seen from the data in Table 1 that the various performances of the optoelectronic composite cable in Example 10 are better than those of the optoelectronic composite cable using a general electromagnetic shielding layer aluminum-plastic composite tape. It can be seen that the optimized design of the composition of the modified glass fiber can not only make it have a good electromagnetic shielding effect, but also improve its structural strength. The modified S4 grade high-strength glass fiber has a low carbon content and good pressure resistance and tensile strength. At the same time, it can be combined with other materials in the reinforced shielding layer to achieve a good electromagnetic shielding effect. It is respectively used in the reinforced shielding layer, the reinforced fixing line and the auxiliary fixing layer. By adjusting the dosage to achieve different purposes, the optoelectronic combination cable of the present invention has a good electromagnetic shielding effect.

Claims

1. An optoelectronic combination cable with enhanced electromagnetic shielding effect, characterized in that: It comprises a flat outer sheath (1), two transversely coaxial cable cores (2) symmetrically arranged at both ends of the inner part of the outer sheath (1), and two longitudinally coaxial optical cable cores (3) symmetrically arranged at the middle part of the outer sheath (1); The cable core (2) and the optical cable core (3) located on the same side are jointly covered by a reinforced shielding layer (4); a reinforced fixing wire (5) is provided between the cable core (2) and the optical cable core (3) located on the same side; the reinforced fixing wire (5) presses the reinforced shielding layer (4) inwardly so that the reinforced fixing wire (5) is located between the cable core (2) and the optical cable core (3); and an auxiliary fixing layer (6) is provided between the two reinforced shielding layers (4); The material of the reinforced shielding layer (4) comprises, by weight: 25 to 30 parts of phenolic resin, 1 to 2 parts of carbon fiber, 2 to 3 parts of boron nitride, 0.5 to 2.5 parts of silicon carbide whiskers, and 5 to 8 parts of modified glass fiber.

2. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 1, characterized in that: The outer sheath (1) comprises a chlorinated polyethylene sheath (11) located on the outermost side, and an EPDM rubber-based composite liner (12) located on the inner side of the chlorinated polyethylene sheath (11).

3. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 2, characterized in that: The raw material components and contents of the EPDM-based composite liner (12) are measured in percentage by mass and include 2-5% carbon fiber, 10-20% aluminum nitride powder, and the balance being liquid EPDM.

4. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 1, characterized in that: The cable core (2) comprises an outermost polyurethane foam sheath (21), a first steel belt armor layer (22) located inside the polyurethane foam sheath (21), and an oxygen-free copper conductor (23) located inside the first steel belt armor layer (22).

5. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 1, characterized in that: The optical cable core (3) comprises an outermost polybutylene terephthalate sheath (31), a second steel tape armor layer (32) located inside the polybutylene terephthalate sheath (31), and an optical fiber (33) located inside the second steel tape armor layer (32).

6. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 1, characterized in that: The material of the reinforcing fixing line (5) comprises, by weight, 7 to 11 parts of epoxy resin and 2 to 6 parts of modified glass fiber. The material of the auxiliary fixing layer (6) comprises, by weight, 7 to 11 parts of epoxy resin and 1 to 4 parts of modified glass fiber. An auxiliary fixing line (61) is provided at each end of the auxiliary fixing layer (6). The auxiliary fixing line (61) is in contact with the interior of the outer sheath (1).

7. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 6, characterized in that: The preparation method of the modified glass fiber is as follows: placing S4 grade high-strength glass fiber in an oven at 550-600°C for heat treatment for 2-3 hours, then mixing a palmitic acid solution with a mass concentration of 40% with anhydrous ethanol in a mass ratio of 10-15:100 to obtain a modified liquid, completely immersing the heat-treated S4 grade high-strength glass fiber in the modified liquid, heating to 42-45°C for soaking for 1-2 hours, taking out and drying to obtain the modified glass fiber.

8. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 1, characterized in that: The preparation method of the optoelectronic combination cable is as follows: S1. Preparation of the cable core (2): using an extruder to co-extrude the raw materials of the cable core (2) to obtain a linear cable core (2); S2, preparing the optical cable core (3): using an extruder to co-extrude the raw materials of the optical cable core (3) to obtain a linear optical cable core (3); S3, preparation of the reinforced shielding layer (4): placing the raw materials of the reinforced shielding layer (4) together in a mixer, stirring and mixing at 45-50° C. for 0.5-1 h, with a stirring speed of 200-300 rpm, and then extruding and granulating the mixed product through a twin-screw extruder to obtain a strip-shaped reinforced shielding layer (4), with an extrusion temperature of 150-200° C.; S4, preparation of the reinforcing fixing wire (5): using an extruder to co-extrude the raw materials of the reinforcing fixing wire (5) to obtain a linear reinforcing fixing wire (5); S5, preparing the auxiliary fixing layer (6): using an extruder to co-extrude the raw materials of the auxiliary fixing layer (6) to obtain a layered auxiliary fixing layer (6); S6. Co-extrusion molding: The cable core (2), the optical cable core (3), the reinforced shielding layer (4), the reinforced fixing wire (5) and the auxiliary fixing layer (6) are placed symmetrically in pairs and arranged in parallel, wherein the reinforced fixing wire (5) squeezes the reinforced shielding layer (4) inwardly so that the reinforced fixing wire (5) is located between the cable core (2) and the optical cable core (3), and the auxiliary fixing layer (6) is placed between the two reinforced shielding layers (4) and arranged closely, and then the outer sheath (1) is co-extruded on the outer periphery to obtain an optoelectronic combination cable, and the line output speed is 1 to 2 m / min.

9. The optoelectronic combination cable with enhanced electromagnetic shielding effect as claimed in claim 8, characterized in that: In S6, when the co-extrusion molding is performed, the outside of the reinforced shielding layer (4) is continuously steam-cured through a continuous vulcanization pipeline with water vapor balance, and the steam vulcanization pressure is controlled at 0.6-0.8 MPa. The relationship between the steam vulcanization time t and the steam vulcanization temperature T is as follows: Wherein, K is a constant, which is 2.3; T1 is the minimum steam vulcanization temperature, which is 120-140°C; t1 is the steam vulcanization time corresponding to the minimum steam vulcanization temperature, which is 20 minutes; T2 is the preset steam vulcanization temperature, which is 160-180°C; t2 is the steam vulcanization time corresponding to the preset steam vulcanization temperature.

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