CN-224203880-U - Environment-friendly high-flame-retardance shielding control cable for special instrument

Abstract

The utility model relates to the technical field of control cables, in particular to an environment-friendly high-flame-retardance special instrument shielding control cable which comprises a plurality of mutually twisted control cable cores, a plurality of flame-retardance filling strips, a composite shielding layer, an outer sheath and an outer sheath, wherein the flame-retardance filling strips are filled in gaps among the control cable cores and are wrapped and fixed by flame-retardance belts to form a cable core with a circular section, the composite shielding layer is wrapped on the outer wall of the cable core, and the outer sheath is extruded on the outer wall of the composite shielding layer. According to the utility model, through the combination of the copper strip shielding layer and the copper wire shielding layer in the composite shielding layer, the advantages of the copper strip shielding layer and the copper wire shielding layer can be exerted on different frequency bands, the comprehensive shielding effect is provided, meanwhile, the elastic deformation space is increased by utilizing the convex structure of the copper strip, the overall flexibility of the cable is high, the frequent bending and wiring in a narrow space are facilitated, meanwhile, the buffer and protection of the aramid fiber weaving layer on the copper wire weaving layer are utilized, the probability of broken wires of the copper wire under the action of the compression/tensile stress of the cable can be reduced, and the shielding performance of the cable is maintained.

Inventors

• LI JINHONG
• CHANG CHENG
• SHAO YUAN
• Sheng Kebin

Assignees

• 江苏长峰电缆有限公司

Dates

Publication Date

20260505

Application Date

20250325

Claims (9)

1. 1. An environment-friendly high-flame-retardance shielding control cable for special instruments, which is characterized by comprising: A plurality of control wire cores (1) twisted with each other; a plurality of flame-retardant filling strips (2) are filled in gaps among the control wire cores (1) and are wrapped and fixed by flame-retardant belts to form a cable core with a circular section; The composite shielding layer is coated on the outer wall of the cable core; an outer sheath (7) extruded on the outer wall of the composite shielding layer; The composite shielding layer comprises an inner shielding layer (4), a buffer layer (5) and an outer shielding layer (6) which are distributed from inside to outside, wherein the inner shielding layer (4) comprises a copper strip coating layer, a raised structure (41) is arranged on the surface of the copper strip, the buffer layer (5) comprises an aramid fiber woven buffer layer, and the outer shielding layer (6) comprises a copper wire woven shielding layer, wherein the weaving density of the aramid fiber woven buffer layer is greater than the distribution density of the raised structure (41); The aramid woven buffer layer comprises aramid filaments which are mutually intersected and along a first direction and aramid filaments which are mutually intersected and along a second direction, wherein the first direction is parallel to the axis direction of the cable, and the second direction is perpendicular to the axis direction of the cable.
2. 2. The shielding control cable of the environment-friendly high-flame-retardance special instrument, as set forth in claim 1, wherein the raised structures (41) on the surface of the copper belt are distributed in a matrix or honeycomb shape.
3. 3. The environmentally friendly high flame retardant specialty instrument shield control cable of claim 1, wherein said copper tape coating comprises a longitudinally wrapped copper tape shield.
4. 4. The environment-friendly high-flame-retardance special instrument shielding control cable according to claim 1, wherein the height of the protruding structure (41) is 1-2 times the thickness of the copper strip.
5. 5. The environment-friendly high-flame-retardance special instrument shielding control cable according to claim 1, wherein the diameter of the protruding structure (41) is 1.5-2 mm.
6. 6. The shielding control cable for environment-friendly high-flame-retardance special instruments according to claim 1 or 5, wherein the distance between adjacent protruding structures (41) is 2-3 times the diameter of the protruding structures (41).
7. 7. The environment-friendly high-flame-retardance shielding control cable for special instruments according to claim 1, wherein the braiding angle of the copper wire braiding shielding layer is 45 degrees, and the braiding density is more than 85%.
8. 8. The environment-friendly high-flame-retardance special instrument shielding control cable of claim 1, wherein the flame-retardance filling strip (2) comprises a low-smoke halogen-free flame-retardance polypropylene filling strip.
9. 9. The environment-friendly high-flame-retardance special instrument shielding control cable according to claim 1, characterized in that the outer sheath (7) comprises an environment-friendly low-smoke halogen-free flame-retardant sheath.

Description

Environment-friendly high-flame-retardance shielding control cable for special instrument Technical Field The utility model relates to the technical field of control cables, in particular to an environment-friendly high-flame-retardance shielding control cable for special instruments. Background The shielding control cable is mainly used for signal transmission in the industrial field, especially for wiring of electric instruments and control signal transmission of an automatic control system, realizes stable signal transmission, and ensures monitoring and safe operation control of the operation state of electric equipment. Shielded control cables are typically composed of a conductor, an insulating layer, a shielding layer, and a jacket layer. The conductor typically employs high purity copper or aluminum to ensure good electrical conductivity. The insulating layer is made of a material with high insulating property and flame retardant property, such as crosslinked polyethylene, halogen-free flame retardant polyolefin and the like, and is used for isolating conductors and preventing current leakage and short circuit. The shielding layer is a key part of the cable, and is usually made of metal materials such as copper foil, aluminum foil or metal woven mesh, and the shielding layer is used for shielding external electromagnetic interference and ensuring stable transmission of signals in the cable. At present, copper wires are commonly adopted for shielding layers in a braiding manner so as to keep good flexibility and space laying of cables, the wire breakage rate of the cables after repeated bending can be improved, enough shielding effect cannot be provided under a complex electromagnetic environment, and meanwhile, a single shielding layer cannot provide effective flame retardance, especially flame retardance, shielding and high mechanical property requirements in special electric appliances and special instrument applications. Disclosure of utility model Aiming at the technical problems of the shielding control cable in the prior art, the utility model provides an environment-friendly high-flame-retardance special instrument shielding control cable, which comprises: a plurality of control wire cores twisted with each other; The flame-retardant filling strips are filled in gaps among the control wire cores and are wrapped by flame-retardant belts to form cable cores with circular cross sections; The composite shielding layer is coated on the outer wall of the cable core; The outer sheath is extruded on the outer wall of the composite shielding layer; The composite shielding layer comprises an inner shielding layer, a buffer layer and an outer shielding layer which are distributed from inside to outside, wherein the inner shielding layer comprises a copper strip coating layer, a raised structure is arranged on the surface of the copper strip, the buffer layer comprises an aramid fiber woven buffer layer, and the outer shielding layer comprises a copper wire woven shielding layer. Preferably, the copper strip coating layer comprises a longitudinally-coated copper strip shielding layer. Preferably, the convex structures on the surface of the copper strip are distributed in a matrix or honeycomb shape. Preferably, the height of the protruding structure is 1-2 times of the thickness of the copper strip. Preferably, the diameter of the protruding structures is 1.5-2 mm, and the distance between adjacent protruding structures is 2-3 times of the diameter of the protruding structures. Preferably, the weaving density of the aramid woven buffer layer is greater than the distribution density of the raised structures. Preferably, the aramid woven buffer layer comprises aramid filaments in a first direction and aramid filaments in a second direction which are mutually intersected, wherein the first direction is parallel to the cable axis direction, and the second direction is perpendicular to the cable axis direction. Preferably, the braiding angle of the copper wire braided shielding layer is 45 degrees, and the braiding density is more than 85%. Preferably, the flame retardant filler strip comprises a low smoke halogen-free flame retardant polypropylene filler strip. Preferably, the outer sheath comprises an environment-friendly low-smoke halogen-free flame retardant sheath. By the technical scheme, the environment-friendly high-flame-retardance special instrument shielding control cable has the remarkable advantages that: The environment-friendly high-flame-retardance special instrument shielding control cable provided by the utility model has the advantages that the copper strip shielding layer and the copper wire shielding layer in the composite shielding layer are combined to provide a comprehensive shielding effect, meanwhile, the elastic deformation space is increased by utilizing the bulge structure of the copper strip, the overall flexibility of the cable is improved, the wiring in frequent bending and a na