Temperature-resistant and oil-resistant special cable for rail transit

Abstract

The utility model discloses a temperature-resistant and oil-resistant special cable for rail transit. The temperature-resistant and oil-resistant special cable comprises conductors, an insulating layer, a filling layer, a shielding layer and a sheath layer which are sequentially arranged from inside to outside, the conductor adopts a plurality of stranded tinned copper conductors, and the stranding pitch diameter ratio is 12-16 times; the insulating layer is made of a high-temperature-resistant cross-linked polyethylene material, and the cross-linked polyethylene insulating layer modified by nano-magnesium hydroxide is adopted, so that the temperature-resistant grade is improved, and the temperature-resistant capability is improved compared with that of a traditional material; the semi-conductive buffer layer is additionally arranged between the conductor and the insulating layer, interface separation caused by thermal expansion difference is reduced, and the polyurethane elastomer sheath layer is matched with a silicone oil-resistant additive; the concave-convex anti-skid lines on the surface of the sheath increase the grabbing force in an oil stain environment, the friction coefficient is increased, the slip risk during installation is reduced, and the service life and the maintenance period are prolonged through the anti-aging design of materials; redundant materials are reduced due to the structural integrated design, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field especially relates to a rail transit temperature and oil resistant special cable. BACKGROUND

[0002] With the development of rail transit to high speed and intelligence, cables need to operate stably under complex working conditions (such as high temperature, oil stain and vibration) for a long time. The existing rail transit cables have the following problems:

[0003] 1. Insufficient temperature resistance: the upper limit of the long-term working temperature of traditional PVC or ordinary polyethylene insulation material is 70-90℃, which is difficult to meet the use requirements of high-temperature areas (>100℃) such as locomotive power system and braking system, and is easy to cause insulation aging;

[0004] 2. Poor oil resistance: the conventional sheath material (such as chloroprene rubber) is easy to swell when contacting lubricating oil and hydraulic oil, which leads to a decrease in mechanical strength, and the volume change rate after long-term immersion exceeds 30% (ASTM D471 standard test);

[0005] 3. Weak anti-electromagnetic interference ability: the single-layer aluminum foil shielding structure is easy to crack under high-frequency vibration, and the shielding efficiency is less than 60dB (1GHz frequency test), which affects the stability of signal transmission;

[0006] 4. Insufficient mechanical strength: the cable filling layer lacks tensile reinforcing structure, and the conductor is easy to displace under bending working conditions, which leads to local stress concentration of the insulation layer and shortens the service life. UTILITY MODEL CONTENTS

[0007] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a rail transit temperature and oil resistant special cable.

[0008] One of the purposes of the utility model is achieved by adopting the following technical scheme: a rail transit temperature and oil resistant special cable, comprising a conductor, an insulation layer, a filling layer, a shielding layer and a sheath layer arranged in sequence from inside to outside; the conductor adopts a plurality of stranded tinned copper conductors, and the stranded pitch ratio is 12-16 times; the insulation layer is made of high-temperature resistant crosslinked polyethylene material, and the thickness is 0.8-1.2mm; the filling layer adopts halogen-free flame-retardant polyolefin composite material, and aramid fiber tensile elements are embedded inside; the shielding layer is a double-layer structure, comprising an inner aluminum-plastic composite tape and an outer tinned copper wire braid layer, and the braid density is ≥85%; the sheath layer adopts oil-resistant polyurethane elastomer material, and the thickness is 1.5-2.0mm, and the Shore hardness is 80-85A.

[0009] Further, the insulation layer is added with nanoscale magnesium hydroxide flame retardant, and the adding amount is 15-25% of the weight of the crosslinked polyethylene base material; the temperature resistance grade of the insulation layer reaches 125 DEG C for long-term use, and the volume resistivity is ≥1*10 4 Ω·cm.

[0010] Further, the aramid fiber tensile elements in the filling layer are uniformly arranged in a spiral shape, the fiber diameter is 0.2-0.5mm, and the interval between adjacent spirals is 5-8mm; the oxygen index of the filling layer is ≥32%.

[0011] Further, the aluminum layer of the aluminum-plastic composite tape in the shielding layer has a thickness of 0.08-0.12mm, the plastic layer is a polyester film with a thickness of 0.03-0.05mm; the single wire diameter of the tinned copper wire braiding layer is 0.12-0.15mm, and the braiding angle is 45-60 DEG.

[0012] Further, the sheath layer is added with 2-5% of carbon black anti-aging agent and 1-3% of silicone oil-resistant aid in terms of weight percentage, and the oil resistance performance meets the standard of GB / T2951.5, that is, the tensile strength change rate after IRM902 oil immersion is ≤±20%.

[0013] Further, an armor layer is arranged between the shielding layer and the sheath layer, and the armor layer is composed of galvanized steel wire wrapping, the steel wire diameter is 0.25-0.35mm, the wrapping gap is ≤1mm, and the wrapping angle is 30-45 DEG.

[0014] Further, the outer side of the armor layer is coated with a water-resistant hot melt adhesive layer, and the adhesive layer has a thickness of 0.1-0.3mm; the softening point of the water-resistant hot melt adhesive is 90-110 DEG C.

[0015] Further, a semi-conductive buffer layer is arranged between the conductor and the insulation layer, and the buffer layer is made of semi-conductive ethylene-propylene rubber, and has a thickness of 0.3-0.5mm and a surface resistivity of ≤1*10

[0016] Further, the outer surface of the sheath layer is provided with concave-convex anti-skid lines, the line depth is 0.2-0.4mm, and the interval between adjacent lines is 2-4mm.

[0017] Further, the overall outer diameter of the cable is 15-25mm, the bending radius is ≤6 times the outer diameter of the cable, the working temperature range is -40 DEG C to +125 DEG C, and the oil resistance performance meets the standard of ASTM D471, that is, the volume change rate after #3 oil immersion for 168 hours is ≤15%.

[0018] Compared with the prior art, the cable has the advantages that:

[0019] The utility model discloses through the synergic modification of multilayer composite structure and material, realize the following remarkable advantage:

[0020] 1, temperature resistance breakthrough

[0021] Adopt the cross -linked polyethylene insulation layer of nano magnesium hydroxide modification, and the temperature grade is promoted, and compared with traditional material temperature resistance ability is improved;

[0022] The semi -conductive buffer layer is additionally arranged between the conductor and the insulation layer, and the interface separation caused by the thermal expansion difference is reduced.

[0023] 2, outstanding oil resistance

[0024] Polyurethane elastomer sheath layer cooperates silicone oil -resistant additive;The concave -convex antiskid line of sheath surface increases the adhesion under the oil stain environment, and the friction coefficient is improved, and the risk of slipping when installing is reduced.

[0025] 3, electromagnetic shielding and mechanical strengthening

[0026] Aluminum plastic composite tape + plated tin copper wire braiding double -layer shielding, shielding effectiveness, compared with single -layer shielding structure improves;The spiral arrangement aramid fiber of filling layer, axial tensile strength improves, and the bending radius is optimized, and the frequent bending working condition of track vehicle is adapted.

[0027] 4, environmental adaptability is enhanced

[0028] The armored layer and water -resistant glue layer make the cable have IP68 protection level and can resist the hot and humid, oil -stained composite environment;

[0029] 5, long life and low cost

[0030] Through the material anti -aging design, the service life is prolonged, and the maintenance cycle is prolonged;

[0031] The structure integration design reduces the redundant material, and the production cost is reduced.

[0032] The above description is only the summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following preferred embodiments are taken, and the detailed description is as follows in cooperation with the drawings. DETAILED DESCRIPTION

[0033] Figure 1 It is the structure section view of this embodiment.

[0034] In the drawing: 1, conductor;2, insulation layer;3, filling layer;4, shielding layer;5, sheath layer;6, armored layer;7, water -resistant hot melt adhesive layer;41, aluminum plastic composite tape;42, plated tin copper wire braiding layer;51, concave -convex antiskid line;11, buffer layer. DETAILED DESCRIPTION

[0035] The utility model will be described further, combining with the drawings and specific implementation, it is to be explained that, under the premise of not conflicting, the following described each embodiment or each technical feature between can be combined to form new embodiment.

[0036] It is to be explained that, when the assembly is called "fixed to" another assembly, it can be directly on another assembly or there can be a middle assembly. When an assembly is considered "connected" to another assembly, it can be directly connected to another assembly or a middle assembly can exist at the same time. When an assembly is considered "disposed on" another assembly, it can be directly disposed on another assembly or a middle assembly can exist at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] Please refer to Figure 1 The rail transit temperature-resistant and oil-resistant special cable of the embodiment comprises a conductor 1, an insulation layer 2, a filling layer 3, a shielding layer 4 and a sheath layer 5 arranged in sequence from inside to outside; the conductor 1 adopts a plurality of stranded tinned copper conductors, and the stranded pitch ratio is 12-16 times; the insulation layer 2 is made of high-temperature-resistant cross-linked polyethylene material, and the thickness is 0.8-1.2 mm; the filling layer 3 adopts halogen-free flame-retardant polyolefin composite material, and aramid fiber tensile elements 31 are embedded in the filling layer 3; the shielding layer 4 has a double-layer structure, comprising an inner aluminum-plastic composite tape 41 and an outer tinned copper wire braid layer 42, and the braid density is greater than or equal to 85%; the sheath layer 5 adopts oil-resistant polyurethane elastomer material, the thickness is 1.5-2.0 mm, the Shore hardness is 80-85A, nanoscale magnesium hydroxide flame retardant is added in the insulation layer 2, the addition amount is 15-25% of the weight of the cross-linked polyethylene base material, the temperature-resistant grade of the insulation layer 2 reaches 125 DEG C long-term use, the volume resistivity is greater than or equal to 1 x 10 4Ω·cm, the aramid fiber tensile elements 31 in the filling layer 3 are arranged in a spiral shape, the fiber diameter is 0.2-0.5mm, the interval between adjacent spirals is 5-8mm, the oxygen index of the filling layer 3 is ≥32%, the aluminum layer of the aluminum-plastic composite tape 41 in the shielding layer 4 has a thickness of 0.08-0.12mm, the plastic layer is a polyester film with a thickness of 0.03-0.05mm; the single wire diameter of the tinned copper wire braiding layer 42 is 0.12-0.15mm, the braiding angle is 45-60°, the anti-aging agent of carbon black with a weight percentage of 2-5% and the oil-resistant additive of silicone with a weight percentage of 1-3% are added in the sheath layer 5, the oil resistance performance meets the standard of GB / T2951.5, the tensile strength change rate after IRM902 oil immersion is ≤±20%, the armored layer 6 is further arranged between the shielding layer 4 and the sheath layer 5, the armored layer 6 is composed of galvanized steel wire wrapping, the steel wire diameter is 0.25-0.35mm, the wrapping gap is ≤1mm, the wrapping angle is 30-45°, the outer side of the armored layer 6 is coated with a water-resistant hot melt adhesive layer 7, the adhesive layer has a thickness of 0.1-0.3mm, the softening point of the water-resistant hot melt adhesive is 90-110℃, the semi-conductive buffer layer 11 is arranged between the conductor 1 and the insulation layer 2, the buffer layer 11 is made of semi-conductive ethylene-propylene rubber, the thickness is 0.3-0.5mm, the surface resistivity is ≤1×10³Ω, the outer surface of the sheath layer 5 is provided with concave-convex anti-slip lines 51, the line depth is 0.2-0.4mm, the interval between adjacent lines is 2-4mm, the overall outer diameter of the cable is 15-25mm, the bending radius is ≤6 times the outer diameter of the cable, the working temperature range is -40℃ to +125℃, and the oil resistance performance meets the standard of ASTM D471, the volume change rate after #3 oil immersion for 168 hours is ≤15%.

[0039] The above embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of protection of the utility model, and any non-substantial changes and replacements made by the person skilled in the art on the basis of the utility model all belong to the range of protection claimed by the utility model.

Claims

1. A rail transit temperature-resistant and oil-resistant special cable, characterized in that, The cable comprises, from inside to outside, a conductor (1), an insulation layer (2), a filling layer (3), a shielding layer (4) and a sheath layer (5); the conductor (1) is made of a plurality of twisted tinned copper conductors, and the twist pitch ratio is 12-16 times; the insulation layer (2) is made of high-temperature-resistant cross-linked polyethylene material, and the thickness is 0.8-1.2 mm; the filling layer (3) is made of halogen-free flame-retardant polyolefin composite material, and aramid fiber tensile elements (31) are embedded in the filling layer (3); the shielding layer (4) has a double-layer structure, comprising an inner aluminum-plastic composite tape (41) and an outer tinned copper wire braid layer (42), and the braid density is greater than or equal to 85%; the sheath layer (5) is made of oil-resistant polyurethane elastomer material, and the thickness is 1.5-2.0 mm, and the Shore hardness is 80-85A.

2. The rail transit temperature-resistant and oil-resistant special cable according to claim 1, characterized in that, The aramid fiber tensile elements (31) in the filling layer (3) are uniformly arranged in a spiral shape, the fiber diameter is 0.2-0.5 mm, and the distance between adjacent spirals is 5-8 mm, and the oxygen index of the filling layer (3) is greater than or equal to 32%.

3. The rail transit temperature-resistant and oil-resistant special cable of claim 1, wherein, The aluminum layer of the aluminum-plastic composite tape (41) in the shielding layer (4) has a thickness of 0.08-0.12 mm, the plastic layer is a polyester film with a thickness of 0.03-0.05 mm; the single wire diameter of the tinned copper wire braid layer (42) is 0.12-0.15 mm, and the braid angle is 45-60°.

4. The track transit temperature-resistant and oil-resistant special cable according to any one of claims 1-3, characterized in that, A sheath layer (6) is further arranged between the shielding layer (4) and the sheath layer (5), and the sheath layer (6) is composed of a galvanized steel wire wrapping layer, the steel wire diameter is 0.25-0.35 mm, the wrapping gap is less than or equal to 1 mm, and the wrapping angle is 30-45°.

5. The rail transit temperature-resistant and oil-resistant special cable of claim 4, wherein, The outer side of the sheath layer (6) is coated with a water-resistant hot melt adhesive layer (7), and the adhesive layer has a thickness of 0.1-0.3 mm, and the softening point of the water-resistant hot melt adhesive is 90-110℃.

6. The rail transit temperature and oil resistant cable of claim 1, wherein, A semi-conductive buffer layer (11) is arranged between the conductor (1) and the insulation layer (2), and the buffer layer (11) is made of semi-conductive ethylene-propylene rubber, and has a thickness of 0.3-0.5 mm and a surface resistivity of less than or equal to 1×10³Ω.

7. The rail transit temperature-resistant and oil-resistant special cable of claim 1, wherein, A concave-convex anti-slip pattern (51) is arranged on the outer surface of the sheath layer (5), the pattern has a depth of 0.2-0.4 mm, and the distance between adjacent patterns is 2-4 mm.

8. The rail transit temperature-resistant and oil-resistant special cable of claim 1, wherein, The overall outer diameter of the cable is 15-25 mm.

Images