Railway digital signal cable for high-power switch machine

Abstract

The utility model discloses a railway digital signal cable for a high-power switch machine, which comprises a cable core, an insulating protective sleeve, an isolating inner sheath, a flame-retardant neck bush, a compression-resistant wrapping tape, a buffer wrapping tape and a flame-retardant outer sheath, and is characterized in that the nominal diameter of a conductor of the cable core is larger than 1.5 mm; the insulating protective sleeve, the isolating inner sheath and the flame-retardant neck bush are sequentially extruded outside the cable core from inside to outside, the compression-resistant wrapping tape and the buffer wrapping tape are sequentially lapped outside the flame-retardant neck bush from inside to outside, and the flame-retardant outer sheath is extruded outside the buffer wrapping tape, so that line attenuation and voltage drop can be reduced to ensure the reliability of the whole electrical centralized operation; the device is very suitable for connection between related equipment and a control device of a railway turnout switch machine system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cable, in particular to the technical field of railway digital signal cable. BACKGROUND

[0002] Railway digital signal cable, such as the anti-cracking type railway digital signal cable with publication number CN102110496A and the electric mark resistant inner shielding railway digital signal cable with announcement number CN1822244A, is the cable that is indispensable in railway construction and bears signal transmission and energy transmission, is the key component connecting relevant equipment and control device in railway signal system, and is the nerve center of railway operation control system; along with the continuous speed-up of railway and the development trend of high-speed railway entering digitalization, intelligentization and integration, the reliability and safety of railway signal cable become the top priority of high-efficiency operation of high-speed railway system.

[0003] Railway AC turnout is a connecting device for turning locomotive and vehicle from one track into another track, is usually laid in large quantities at stations and marshalling yards, and plays an increasingly important role in railway development in terms of capacity expansion, speed-up and efficiency improvement; along with the continuous increase of the number of turnouts in station yard and the increasing distance from signal building, the control distance of switching equipment is also lengthened (which leads to the increasing length of cable laying distance, and the increasing line attenuation and voltage drop); however, the conductor of the existing railway digital signal cable has a small size (usually less than 1mm in outer diameter), such as the railway digital signal cable with publication number CN110853799A, which is prone to excessive voltage drop loss (which will result in the failure of switching equipment motor operating voltage to meet the standard, thereby possibly causing problems such as failure of motor to work normally, large heat generation and motor burnout). SUMMARY

[0004] The utility model discloses the purpose of solving the problem in the prior art, propose the railway digital signal cable for high-power switch machine, can reduce line attenuation, voltage drop to guarantee the whole electrical centralized operation reliability, be very suitable for the connection between relevant equipment and control device of railway turnout switch machine system.

[0005] To achieve the above-mentioned purpose, the utility model provides a railway digital signal cable for high-power switch machine, which comprises a cable core, an insulation protective sleeve, an isolation inner sheath, a flame-retardant inner lining, a compression-resistant tape, a buffer tape and a flame-retardant outer sheath, the nominal diameter of the conductor of the cable core is greater than 1.5mm, the insulation protective sleeve, the isolation inner sheath and the flame-retardant inner lining are successively extruded outside the cable core from inside to outside, the compression-resistant tape and the buffer tape are successively wrapped outside the flame-retardant inner lining from inside to outside, and the flame-retardant outer sheath is extruded outside the buffer tape.

[0006] As preferred, the cable core is formed by four insulated wires, each of which is a four-wire group formed by four insulated single wires, each of which is composed of a conductor and a skin-and-bubble composite polyolefin insulation sleeve extruded on the conductor, the bubble degree of the bubble layer of the skin-and-bubble composite polyolefin insulation sleeve is controlled to be 50-70%, the thickness of the inner skin layer of the skin-and-bubble composite polyolefin insulation sleeve is 0.03-0.08mm, and the thickness of the outer skin layer of the skin-and-bubble composite polyolefin insulation sleeve is 0.10-0.15mm.

[0007] As preferred, the insulation protective sleeve is a polyethylene sleeve and has a thickness of 0.8-1.2mm.

[0008] As preferred, the isolation inner sheath is an aluminum sheath and has a thickness of 1.0-1.5mm.

[0009] As preferred, the flame-retardant inner lining and the flame-retardant outer sheath are both ceramic low-smoke halogen-free flame-retardant polyolefin sheaths, the thickness of the flame-retardant inner lining is 0.8-1.2mm, and the thickness of the flame-retardant outer sheath is not less than 2.1mm.

[0010] As preferred, the compression-resistant wrapping is formed by double-steel band wrapping and has a gap rate controlled to be not more than 48%.

[0011] As preferred, the buffer wrapping is a silicone rubber band and has a thickness of 0.1-0.3mm, and the surface of the buffer wrapping is provided with a honeycomb concave-convex texture.

[0012] The utility model discloses the beneficial effect:

[0013] 1) by making the cable core adopt large-diameter conductor design, thereby effectively reducing the direct current resistance, reducing the line loss and increasing the transmission distance, the technical problems such as line attenuation, pressure drop, and switching equipment motor stall, burning and action delay can be solved, the optimal value of the action current and conversion time of the novel high-power switch machine is ensured, the safety and reliability of driving are improved, the demand of high-power switch machine one wiring is met, and engineering investment and wiring space are reduced.

[0014] 2) by using the four-wire group formed by four insulated single wires as the insulated wire, the four insulated wires are stranded to form the cable core, and each insulated single wire is wrapped with the skin-and-bubble composite polyolefin insulation sleeve, the compression resistance of the cable core can be improved to 1600N.

[0015] 3) by setting multiple layers and multiple protection structure layers outside the cable core, the mechanical damage resistance of the cable can be further improved (the product of this model has no flashover and breakdown phenomenon after being subjected to 5min 12kN compression and 6kg 1m impact, and the sheath has no visible cracks), and the reliability of the insulation is ensured.

[0016] The features and advantages of the present application will be described in detail with reference to the embodiments combined with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the sectional view of the railway digital signal cable for high-power switch machine of the present application;

[0018] Figure 2 is the sectional view of the insulated wire of the railway digital signal cable for high-power switch machine of the present application.

[0019] In the figure: 1 - cable core, 11 - conductor, 12 - skin bubble skin composite polyolefin insulation sleeve, 121 - inner skin layer, 122 - foaming layer, 123 - outer skin layer, 2 - insulation protective sleeve, 3 - isolation inner sheath, 4 - flame-retardant inner lining, 5 - compression-resistant tape, 6 - buffer tape, 7 - flame-retardant outer sheath. DETAILED DESCRIPTION

[0020] Referring to Figure 1 and Figure 2 , the railway digital signal cable for high-power switch machine of the present application comprises a cable core 1, an insulation protective sleeve 2, an isolation inner sheath 3, a flame-retardant inner lining 4, a compression-resistant tape 5, a buffer tape 6 and a flame-retardant outer sheath 7, the nominal diameter of the conductor 11 of the cable core 1 is greater than 1.5 mm, the insulation protective sleeve 2, the isolation inner sheath 3 and the flame-retardant inner lining 4 are successively extruded and wrapped outside the cable core 1 from inside to outside, the compression-resistant tape 5 and the buffer tape 6 are successively wrapped outside the flame-retardant inner lining 4 from inside to outside, and the flame-retardant outer sheath 7 is extruded and wrapped outside the buffer tape 6.

[0021] The cable core 1 is formed by four insulated wires being twisted together, each of the insulated wires is a four-wire group formed by four insulated single wires being twisted together, each of the insulated single wires is composed of a conductor 11 and a skin bubble skin composite polyolefin insulation sleeve 12 extruded and wrapped outside the conductor 11, the foaming degree of the foaming layer 122 of the skin bubble skin composite polyolefin insulation sleeve 12 is controlled at 60%, the thickness of the inner skin layer 121 of the skin bubble skin composite polyolefin insulation sleeve 12 is 0.05 mm, and the thickness of the outer skin layer 123 of the skin bubble skin composite polyolefin insulation sleeve 12 is 0.135 mm; specifically, the conductor 11 is a soft round copper wire of TR type and with a nominal diameter of 1.78 mm (such a large conductor diameter design can reduce the direct current resistance, reduce the line loss, increase the transmission distance, and meet the demand of one-time wiring of the high-power switch machine), and the special skin bubble skin composite polyolefin insulation sleeve 12 can further reduce the dielectric loss, thereby improving the insulation mechanical properties of the single wire; in addition, different twisting pitches can be adopted between the four insulated wires and between the four insulated single wires of each insulated wire to optimize the crosstalk between the wire groups, thereby improving the mutual anti-interference ability between the units of the cable core.

[0022] The insulating protective sleeve 2 is a polyethylene sleeve and has a thickness of 1.0 mm.

[0023] The isolation inner sleeve 3 is an aluminum sleeve and has a thickness of 1.2 mm.

[0024] The flame-retardant inner sleeve 4 and the flame-retardant outer sleeve 7 are both ceramic low-smoke halogen-free flame-retardant polyolefin sleeves, the thickness of the flame-retardant inner sleeve 4 is 1.0 mm, and the thickness of the flame-retardant outer sleeve 7 is not less than 2.1 mm; wherein the material of the ceramic low-smoke halogen-free flame-retardant polyolefin sleeve is usually composed of polyolefin blend resin + flame-retardant filler (such as aluminum hydroxide and magnesium hydroxide, etc.), such as the heat-insulating ceramic low-smoke flame-retardant cable material disclosed in CN109517258A, which can form a layer of non-melting and non-combustible oxide hard shell in the combustion process to block the channel of the high polymer and the external thermal oxygen reaction.

[0025] The compression-resistant wrapping tape 5 is formed by wrapping a double-steel tape with a thickness of 0.5 mm and the gap rate is controlled to be within 48%.

[0026] The buffer wrapping tape 6 is a silicone rubber tape and has a thickness of 0.2 mm, and the surface of the buffer wrapping tape 6 is provided with a honeycomb concave-convex texture; wherein the silicone rubber tape with the honeycomb concave-convex texture on the surface has good buffering property and can effectively avoid damage to the internal structure.

[0027] The above examples are used to illustrate the present application, but not to limit the present application, and any simple transformation of the present application belongs to the protection scope of the present application.

Claims

1. Railway digital signal cable for high power switches, characterized in that: The cable comprises a cable core (1), an insulating protective sleeve (2), an isolation inner sheath (3), a flame-retardant inner sheath (4), a compression tape (5), a buffer tape (6) and a flame-retardant outer sheath (7), the nominal diameter of the conductor (11) of the cable core (1) is greater than 1.5 mm, the insulating protective sleeve (2), the isolation inner sheath (3) and the flame-retardant inner sheath (4) are successively extruded on the outside of the cable core (1) from inside to outside, the compression tape (5) and the buffer tape (6) are successively wrapped on the outside of the flame-retardant inner sheath (4) from inside to outside, and the flame-retardant outer sheath (7) is extruded on the outside of the buffer tape (6); The cable core (1) is formed by four insulated wires, each of the insulated wires is a four-wire group formed by four insulated single wires, each of the insulated single wires is composed of a conductor (11) and a skin-bubble-skin composite polyolefin insulation sleeve (12) extruded on the outside of the conductor (11), the foaming degree of the foaming layer (122) of the skin-bubble-skin composite polyolefin insulation sleeve (12) is controlled to be 50-70%, the thickness of the inner skin layer (121) of the skin-bubble-skin composite polyolefin insulation sleeve (12) is 0.03-0.08 mm, and the thickness of the outer skin layer (123) of the skin-bubble-skin composite polyolefin insulation sleeve (12) is 0.10-0.15 mm; different twisting pitches are adopted between the four insulated wires and between the four insulated single wires of each insulated wire; The buffer tape (6) is a silicone rubber tape with a thickness of 0.1-0.3 mm, and the surface of the buffer tape (6) is provided with a honeycomb concave-convex texture.

2. The high power railway digital signal cable for a switch machine according to claim 1, wherein: The insulating protective sleeve (2) is a polyethylene sleeve with a thickness of 0.8-1.2 mm.

3. The high power railway digital signal cable for a switch machine according to claim 1, wherein: The isolation inner sheath (3) is an aluminum sheath with a thickness of 1.0-1.5 mm.

4. The high power railway digital signal cable for a switch machine according to claim 1, wherein: The flame-retardant inner sheath (4) and the flame-retardant outer sheath (7) are both ceramic low-smoke halogen-free flame-retardant polyolefin sheaths, the thickness of the flame-retardant inner sheath (4) is 0.8-1.2 mm, and the thickness of the flame-retardant outer sheath (7) is not less than 2.1 mm.

5. The high power railway digital signal cable for a switch machine according to claim 1, wherein: The compression tape (5) is formed by double steel tapes with a thickness of 0.4-0.6 mm and a gap rate controlled to be within 48%.

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