CN112397231B

CN112397231B - Direct current 1500V halogen-free polyolefin flexible cable for track traffic

Info

Publication number: CN112397231B
Application number: CN202011073208.8A
Authority: CN
Inventors: 居盛文
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2022-03-08
Anticipated expiration: 2040-10-09
Also published as: CN112397231A

Abstract

The invention discloses a direct-current 1500V halogen-free polyolefin flexible cable for track traffic, which belongs to the technical field of cables and comprises a cable core, an inner sheath, a flame-retardant layer and an outer sheath, wherein the cable core comprises a rubber tube, an inner spiral chain, support bars and an outer spiral chain, a central through cavity is formed in the axis of the rubber tube, a cavity communicated with the central through cavity is formed in each support bar, a wire core is arranged between every two adjacent support bars, the rotating direction of the outer spiral chain is opposite to that of the inner spiral chain, the inner spiral chain and the outer spiral chain respectively comprise vertical buckling rings and horizontal buckling rings which are alternately and intermittently arranged, and each vertical buckling ring is buckled with the horizontal buckling rings positioned on the two sides of the vertical buckling ring; the inner sheath and the outer sheath are both made of cross-linked halogen-free low-smoke flame-retardant polyolefin materials. The invention has better flame retardant property, meets the requirements of low smoke, no halogen, no toxicity and the like, has excellent torsion resistance and better bending property, and meets the use requirements of rail transit design departments on cables.

Description

Direct current 1500V halogen-free polyolefin flexible cable for track traffic

Technical Field

The invention relates to the technical field of cables, in particular to a direct-current 1500V halogen-free polyolefin flexible cable for rail transit.

Background

The rail transit is a part of railway electrification, a locomotive needs to be dragged by electric power, a large amount of direct current and alternating current power cables are needed in a rail transit power supply system, a 1500V direct current traction cable is a main variety, the direct current cable for the rail transit is laid in a densely populated public place and is in a special underground humid environment for a long time, so that the safety and reliability of the used cable are very high, a subway design department clearly specifies that the cable must meet the performance requirements of no halogen, low smoke, flame retardance, water resistance, oil resistance, weather resistance and the like, and the cable also needs to be soft, small in bending radius and the like due to narrow laying space so as to meet special use requirements.

At present, most of the existing flexible cables for rail transit are made of flexible materials in order to meet better bending performance, so that the cables are easy to twist, and a wire core is easy to be damaged during twisting.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to solve the technical problem of providing a direct current 1500V halogen-free polyolefin flexible cable for rail transit, which has better flame retardant property, meets the requirements of low smoke, no halogen, no toxicity and the like, and has excellent torsion resistance and better bending property.

2. Technical scheme

In order to solve the problems, the invention adopts the following technical scheme:

the utility model provides a there is not steamed polyolefin flexible cable of direct current 1500V for track traffic, includes cable core, inner sheath, fire-retardant layer and the oversheath that from interior to exterior cover was established in proper order, the cable core includes the rubber tube that is located on the axis, along the spiral winding internal spiral chain of rubber tube length direction, along the spiral equidistant distribution's of rubber tube length direction support bar to and along the spiral outer spiral chain of winding outside the support bar outside of cable core length direction, set up central through cavity on the axis of rubber tube, support bar and rubber tube integrated into one piece, and the inside of support bar sets up the cavity that communicates central through cavity, the support bar is located between two adjacent helicoidal circles on the internal spiral chain, the length direction of support bar is located the footpath of cable core, all is equipped with a sinle silk between two adjacent support bars per, sinle silk position both sides on the radial of cable core contact with internal spiral chain and outer helicoidal circle respectively, the rotating direction of the outer spiral chain is opposite to that of the inner spiral chain, the inner spiral chain and the outer spiral chain respectively comprise vertical buckling rings and horizontal buckling rings which are alternately and intermittently arranged, each vertical buckling ring is buckled with the horizontal buckling rings on two sides of the vertical buckling ring, and each horizontal buckling ring is buckled with the vertical buckling rings on two sides of the horizontal buckling ring; the inner sheath and the outer sheath are both made of cross-linked halogen-free low-smoke flame-retardant polyolefin materials.

Furthermore, one end of the supporting bar, which faces away from the rubber tube, is located on the outer side of the circular track where the circle center of the cross section of each wire core is located. The middle parts of the two sides of each wire core are clamped between the two supporting bars, so that each wire core can be well separated, and the supporting effect of the supporting bars on the wire cores can be well realized.

Further, the one end of support bar rubber tube dorsad is connected with the supporting shoe with support bar integrated into one piece, the cross-section of supporting shoe is by its connection side to its opposite side gradually wide setting, a side of support bar dorsad is the arcwall face with the rubber tube coaxial line setting. The supporting block can increase the contact area between one end of the supporting bar, which is back to the rubber tube, and the external spiral chain, so that the supporting bar can be enhanced to resist the pressure generated by the shrinkage of the external spiral chain, and the twisting resistance of the cable core can be improved; the supporting block can also limit the wire core, and can realize better protection effect on the wire core.

Further, the flame-retardant layer is formed by winding a low-smoke halogen-free flame-retardant belt. The low-smoke halogen-free flame-retardant belt does not generate toxic gas when being heated, and can be timely flame-retardant, so that the high-efficiency flame-retardant effect can be achieved.

Further, the support bars are arranged in rows at equal intervals along the peripheral sides of the rubber tubes, the number of the rows of the support bars is equal to that of the wire cores, the support bars in each row are spirally distributed along the length direction of the rubber tubes, and each wire core is spirally wound along the length direction of the rubber tubes outside the inner spiral chain. The sinle silk is spiral winding in the outside of spiral chain, compares in the sinle silk of straight setting, is spiral helicine sinle silk when the cable distortion, can take place to rotate on its helical structure's basis to can reduce the distortion that the sinle silk body takes place, and then can promote the antitorque performance of cable.

3. Advantageous effects

(1) The cable core is internally provided with a rubber tube, an inner spiral chain, support bars and an outer spiral chain, a central through cavity is formed in the axis of the rubber tube, a cavity communicated with the central through cavity is formed in the support bars, the support bars are positioned between two adjacent spiral rings on the inner spiral chain, the length direction of the support bars is positioned in the radial direction of the cable core, a wire core is arranged between every two adjacent support bars, the wire cores are positioned on two sides of the cable core in the radial direction and are respectively contacted with the inner spiral chain and the outer spiral chain, and the spiral direction of the outer spiral chain is opposite to that of the inner spiral chain. When the cable is twisted, the spiral chain with the same spiral direction and twisting direction can be tightened towards the axis side under the action of twisting force, so that the rubber tube is subjected to uniform radial inward pressure, partial gas in the central straight-through cavity can be uniformly extruded into the cavity of the supporting bar in a twisting area, the supporting bar is expanded, the expanded supporting bar and the expanded supporting block can be attached to the cable core more tightly, the compactness of the cable core on the peripheral side of the cable core is improved, and the torsion resistance can be exerted; meanwhile, when the inner spiral chain or the outer spiral chain is tightened, the corresponding spiral chain can extend in the length direction of the corresponding spiral chain, and the circumferential torsion can be divided into a part to the length direction of the cable, so that the force transmitted to the cable core in the radial direction is reduced, and the torsion resistance of the cable is further improved.

(2) The cable core is internally provided with the rubber tube, the inner spiral chain, the supporting bar and the outer spiral chain, wherein the rubber tube and the supporting bar are both made of rubber materials, so that the rubber tube and the supporting bar have better bending performance; interior spiral link and outer spiral link are detained by the perpendicular knot circle of arranging of interval formula in turn and are formed with two liang of looks knots of horizontal knot circle for interior spiral link and outer spiral link have better bendability, satisfy the operation requirement that track traffic design department proposed to the cable, based on this, the material of interior spiral link and outer spiral link can adopt hard material, and it is favorable to promoting the antitorque performance of cable.

(3) The inner sheath and the outer sheath are both made of cross-linked halogen-free low-smoke flame-retardant polyolefin materials, and the flame-retardant layer is arranged between the inner sheath and the outer sheath, so that the flame-retardant capability of the cable is greatly improved, the requirements of low smoke, halogen-free, non-toxic and the like are met, and the cable is safer and more reliable.

In conclusion, the flame-retardant cable material has better flame retardant property, meets the requirements of low smoke, no halogen, no toxicity and the like, has excellent torsion resistance and better bending property, and meets the use requirements of rail transit design departments on cables.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic structural diagram of the rubber tube 2, the internal spiral chain 3, the supporting bar 4 and the supporting block 5;

FIG. 3 is a schematic structural view of the inner spiral chain 3 and the outer spiral chain 7;

fig. 4 is a sectional view of the inner and

outer screw chains

3 and 7 taken along a vertical central plane.

Reference numerals: 1. a central through cavity; 2. a rubber tube; 3. an internal helical chain; 31. a vertical buckling ring; 32. a transverse buckling ring; 4. a supporting strip; 5. a support block; 6. a wire core; 7. an outer helical chain; 8. an inner sheath; 9. a flame retardant layer; 10. an outer sheath.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

Fig. 1 shows a dc 1500V halogen-free polyolefin flexible cable for track traffic, which comprises a cable core, an inner sheath 8, a flame retardant layer 9 and an outer sheath 10, which are sequentially sleeved from inside to outside, and with reference to fig. 1 and fig. 2, the cable core comprises a rubber tube 2 located on an axis, an inner spiral chain 3 spirally wound along the length direction of the rubber tube 2, support bars 4 spirally distributed at equal intervals along the length direction of the rubber tube 2, and an outer spiral chain 7 spirally wound outside the support bars 4 along the length direction of the cable core, a central through cavity 1 is formed on the axis of the rubber tube 2, the support bars 4 and the rubber tube 2 are integrally formed, a cavity communicated with the central through cavity 1 is formed inside the support bars 4, the support bars 4 are located between two adjacent spiral rings on the inner spiral chain 3, the length direction of the support bars 4 is located on the radial direction of the cable core, a cable core 6 is arranged between every two adjacent support bars 4, the wire core 6 is positioned at two sides of the cable core in the radial direction and is respectively contacted with the inner spiral chain 3 and the outer spiral chain 7, the spiral direction of the outer spiral chain 7 is opposite to that of the inner spiral chain 3, as shown in fig. 3 and fig. 4, the inner spiral chain 3 and the outer spiral chain 7 respectively comprise vertical buckling rings 31 and horizontal buckling rings 32 which are alternately and intermittently arranged, each vertical buckling ring 31 is buckled with the horizontal buckling rings 32 positioned at two sides of the vertical buckling ring 31, and each horizontal buckling ring 32 is buckled with the vertical buckling rings 31 positioned at two sides of the horizontal buckling ring 32; the inner sheath 8 and the outer sheath 10 are both made of cross-linked halogen-free low-smoke flame-retardant polyolefin material.

In this embodiment, as shown in fig. 1, one end of the supporting strip 4 facing away from the rubber tube 2 is located outside the circular track where the center of the cross section of each wire core 6 is located. The middle parts of the two sides of the wire core 6 are clamped between the two supporting strips 4, so that each wire core 6 can be well separated, and the supporting effect of the supporting strips 4 on the wire core 6 can be well realized.

In this embodiment, as shown in fig. 1 and fig. 2, one end of the supporting bar 4, which faces away from the rubber tube 2, is connected to a supporting block 5 integrally formed with the supporting bar 4, a cross section of the supporting block 5 is gradually widened from a connecting side to an opposite side of the supporting block, and a side of the supporting block 5, which faces away from the supporting bar 4, is an arc-shaped surface coaxially disposed with the rubber tube 2. The supporting block 5 can increase the contact area between one end of the supporting strip 4, which is back to the rubber tube 2, and the outer spiral chain 7, so that the supporting strip 4 can be enhanced to resist the pressure generated by the contraction of the outer spiral chain 7, and the anti-distortion performance of the cable core can be improved; the setting of supporting shoe 5 can also play limiting displacement to sinle silk 6 to can realize 6 better guard action to sinle silk.

In this embodiment, the flame retardant layer 9 is formed by wrapping a low-smoke halogen-free flame retardant tape. The low-smoke halogen-free flame-retardant belt does not generate toxic gas when being heated, and can be timely flame-retardant, so that the high-efficiency flame-retardant effect can be achieved.

Example 2

The present embodiment is different from embodiment 1 in that:

in the embodiment, the supporting strips 4 are arranged in rows at equal intervals along the peripheral side of the rubber tube 2, and the number of the rows is equal to the number of the wire cores 6; every row of support bars 4 are spirally distributed along the length direction of the rubber tube 2, and every wire core 6 is spirally wound on the outer side (not shown in the figure) of the inner spiral chain 3 along the length direction of the rubber tube 2. The sinle silk 6 is spiral winding in the outside of spiral chain 3, compares in the sinle silk of straight setting, is spiral helicine sinle silk 6 when the cable distortion, can take place to rotate on its helical structure's basis to can reduce the distortion that the sinle silk 6 body takes place, and then can promote the antitorque performance of cable.

Otherwise, the same procedure as in example 1 was repeated.

The direct-current 1500V halogen-free polyolefin flexible cable for rail transit has the following specific action principle:

the inner sheath 8 and the outer sheath 10 of the cable are both made of cross-linked halogen-free low-smoke flame-retardant polyolefin materials, and the flame-retardant layer 9 is arranged between the inner sheath 8 and the outer sheath 10, so that the flame-retardant capability of the cable is greatly improved, the requirements of low smoke, halogen-free, non-toxic and the like are met, and the cable is safer and more reliable;

the cable core is internally provided with a rubber tube 2, an inner spiral chain 3, a supporting bar 4 and an outer spiral chain 7, wherein the rubber tube 2 and the supporting bar 4 are both made of rubber materials and have better bendable performance, and the inner spiral chain 3 and the outer spiral chain 7 are formed by buckling every two vertical buckling rings 31 and every two transverse buckling rings 32 which are alternately and intermittently arranged, so that the inner spiral chain 3 and the outer spiral chain 7 have better bendability and meet the use requirements of a rail transit design department on cables;

when the cable is twisted, the spiral chains (the inner spiral chains 3 or the outer spiral chains 7) with the same spiral direction and the same twisting direction are tightened to the axis side under the action of the twisting force, if the inner spiral chains 3 are tightened, the rubber tubes 2 positioned on the inner sides of the inner spiral chains 3 are subjected to uniform radial inward pressure, partial gas in the central through cavities 1 can be uniformly extruded into the cavities of the supporting bars 4 in the twisting area, so that the supporting bars 4 are expanded, the expanded supporting bars 4 and the supporting blocks 5 can be attached to the cable cores 6 more tightly, the compactness of cable cores on the peripheral sides of the cable cores 6 is improved, and the anti-twisting performance can be exerted; if the outer spiral chain 7 is tightened, the outer spiral chain 7 applies pressure to the inner spiral chain 3 through the wire core 6, the inner spiral chain 3 is transmitted to the rubber tube 2, finally, the rubber tube 2 is also subjected to uniform radial inward pressure, and partial gas in the central through cavity 1 can be uniformly extruded into the cavity of the support bar 4 in the twisting area, so that the support bar 4 expands, the expanded support bar 4 and the support block 5 can be attached to the wire core 6 more tightly, the compactness of the cable core on the peripheral side of the wire core 6 is improved, and the torsion resistance can be exerted; meanwhile, when the inner spiral chain 3 or the outer spiral chain 7 is tightened, the corresponding spiral chain can extend in the length direction of the corresponding spiral chain, and the circumferential torsion can be partially divided into the length direction of the cable, so that the force transmitted to the cable core in the radial direction is reduced, and the torsion resistance of the cable is further improved.

The flame-retardant cable material has the advantages of good flame-retardant property, low smoke, no halogen, no toxicity and the like, excellent torsion resistance and good bending property, and meets the use requirements of rail transit design departments on cables.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims

1. The utility model provides a track is direct current 1500V halogen-free polyolefin flexible cable for traffic, includes cable core, inner sheath (8), fire-retardant layer (9) and oversheath (10) that from interior to exterior cover was established in proper order, its characterized in that, the cable core includes and is located the rubber tube (2) on the axis, along the spiral winding of rubber tube (2) length direction interior spiral chain (3), along the spiral equidistant support bar (4) that distributes of rubber tube (2) length direction to and along the spiral winding of cable core length direction outside outer spiral chain (7) of support bar (4), central through cavity (1) has been seted up on the axis of rubber tube (2), support bar (4) and rubber tube (2) integrated into one piece, and the inside of support bar (4) is seted up the cavity of intercommunication central through cavity (1), support bar (4) are located between two adjacent helicoidal circles on interior spiral chain (3), the length direction of the support bars (4) is located on the radial direction of the cable core, a wire core (6) is arranged between every two adjacent support bars (4), the two sides of the wire core (6) located on the radial direction of the cable core are respectively contacted with the inner spiral chain (3) and the outer spiral chain (7), the rotating direction of the outer spiral chain (7) is opposite to that of the inner spiral chain (3), the inner spiral chain (3) and the outer spiral chain (7) respectively comprise vertical buckling rings (31) and horizontal buckling rings (32) which are alternately and intermittently arranged, each vertical buckling ring (31) is buckled with the horizontal buckling rings (32) located on the two sides of the vertical buckling ring (31), and each horizontal buckling ring (32) is buckled with the vertical buckling rings (31) located on the two sides of the horizontal buckling rings; the inner sheath (8) and the outer sheath (10) are both made of cross-linked halogen-free low-smoke flame-retardant polyolefin materials;

one end of the supporting bar (4), which is back to the rubber tube (2), is positioned on the outer side of a circular track where the circle center of the section of each wire core (6) is positioned;

one end, back to the rubber tube (2), of the supporting strip (4) is connected with a supporting block (5) which is integrally formed with the supporting strip (4), the cross section of the supporting block (5) is gradually widened from the connecting side to the opposite side of the supporting block, and one side, back to the supporting strip (4), of the supporting block (5) is an arc-shaped surface which is coaxially arranged with the rubber tube (2);

the supporting strips (4) are arranged in rows at equal intervals along the peripheral side of the rubber tube (2), the number of the rows is equal to that of the cable cores (6), each row of the supporting strips (4) are spirally distributed along the length direction of the rubber tube (2), and each cable core (6) is spirally wound on the outer side of the inner spiral chain (3) along the length direction of the rubber tube (2);

the rubber tube and the supporting strip are both made of rubber materials.

2. The direct current 1500V halogen-free polyolefin flexible cable for rail transit according to claim 1, characterized in that the flame retardant layer (9) is wrapped by a low smoke halogen-free flame retardant tape.