The utility model relates to a railway signal cable with an aluminum sheath, which comprises a cable core, an aluminum sheath, a hot melt adhesive layer, an inner cushion layer, an armoured layer and a sheath layer, wherein the cable core is formed by stranding a plurality of single wires; the aluminum sheath is longitudinally wrapped around the periphery of the cable core and is produced through argon arc welding; the hot melt adhesive layer is extruded outside the aluminum sheath; the inner cushion layer is extruded on the periphery of the hot melt adhesive layer; the armoured layer is wrapped on the periphery of the inner cushion layer; and the sheath layer is extruded on the periphery of the armoured layer. The railway signal cable has the advantages that the railway signal cable with an aluminum sheath can provide strong protection for the aluminum sheath which functions as a shielding layer, meanwhile, the peel strength between the aluminum sheath and the inner cushion layer is increased, the anticorrosion ability of the cable with an aluminum sheath is also strengthened, the investment is small, and the profit is high.

Railway signal cable with aluminum sheath

Composite wire and manufacturing method thereof

The application comprises a device for protecting against water ingress and fire penetration into interspaces and into cavities through expansion joints in structures, cable ducts and cable lead-throughs which are occupied by cables and/or pipes, and, depending on the application, serves as a fire protection or leakage protection device in landfills, tank systems and transport and/or safety containers in the sea sector. The device comprises a flat-tube cushion which is fixed in terms of length and width and which is equipped on the outer sides with a swellable nonwoven sealing strip. In the interior, the leakage or protective flat-tube cushion is provided with at least one swellable nonwoven sealing strip which has high-tensile-strength closures on the longitudinal side and the transverse side and is filled or evacuated via at least one plastic-coated metal compressed-air valve with a valve extension, and, depending on the application, can be equipped with a radio monitoring or control system.

Reusable device for protecting against water conduction

The invention relates to a plastic extrusion die for cable production, and belongs to the technical field of cable production equipment The plastic extrusion die comprises an outer die and a first inner die, a die cavity is formed in the outer die, and a forming sleeve is arranged in the die cavity and comprises an outer sleeve and an inner sleeve which are matched with each other An injection dieing cavity is formed between the outer sleeve and the inner sleeve, the inner sleeve sleeves a sheath, and the sheath comprises a plurality of sheath bodies which are nested with each other The inner die and the forming sleeve are arranged at the two sides of the outer die, and the sheath composed of the plurality of sleeve bodies which are in cup joint is arranged in the forming sleeve to adjust the thickness of an insulating layer of the cable, so that the requirement for the cooling channel is reduced Meanwhile, the fitting effect of the cable inner core and the external insulating layer is improved The inner die is arranged on a turntable, the plurality of inner dies with different die hole sizes are arranged on the turntable, and the specification of the cable inner core is adjusted by rotating the turntable, so that the operation is convenient, the applicability of the die is greatly improved, the cost and the occupied space are reduced, and the practicability is high

Plastic extrusion die for cable production

The invention relates to a coaxial cable (100) comprising an inner conductor (110) and an outer conductor (120) which is arranged radially outside of said inner conductor (110) and which is electrically isolated from said inner conductor (110), wherein at least one stress absorbing element (130) for absorbing mechanical stress is arranged radially between said inner conductor (110) and said outer conductor (120)

Coaxial cable and method of manufacturing a coaxial cable

A photoelectric composite digital cable used in railways comprises a cable core which comprises a plurality of wire groups; wherein, at least one wire group is an internal shield group, and at least another wire group is a lapped-joint optical fiber unit; gaps between the wire groups are filled with water-blocking ointment; the outside of the cable is covered by an internal sheathing layer, an external water-stop, an aluminum sheathing layer, a metal armor layer and an external sheathing layer in sequence; the external water-stop is made of water-soluble expansion material; the gap between the aluminum sheathing layer and the metal armor layer is filled with water-blocking hot melt adhesive; water-blocking ointment can block water and damp; and the cable can be prevented further from the corrosion of water and damp by providing with external water-stop and the water-blocking hot melt adhesive; so that the lasting safety and the reliability of the signal of rail digital communication can be guaranteed, and the service life of the cable can be prolonged. When in real use, the photoelectric composite digital cable used in railways can realize inflatable-free maintenance, thereby greatly saving the economic operation cost.

Optoelectronic composite railway digital cable

The invention discloses a cable mold capable of realizing highly compact and uniform extrusion molding. The cable mold comprises a mold sleeve, a mold core and an extrusion molding runner, wherein a work part of the mold core comprises an extrusion corrugation section, an extrusion compaction section and a mold core front cone section, a mold sleeve guide cone hole and a nesting hole which are communicated with each other are formed in the mold sleeve, the work part of the mold core is located in the mold sleeve guide cone hole at intervals, and the axis of the mold core and the center line ofthe mold sleeve guide cone hole are located in the same straight line; a setting nest is nested in the nesting hole of the mold sleeve, a cone hole surface for nesting the guide cone hole on the setting nest and the cone hole surface of the mold sleeve guide cone hole are located in the same cone surface. The extrusion corrugation section adopts a conical structure, and the conical surface of theextrusion corrugation section is a sine curve rotation surface. The extrusion compaction section is a semi-parabola rotation surface extending from the extrusion corrugation section to the mold corefront cone section. An extrusion molding layer of the cable extrusion molding mold has the characteristics of being fully plasticized, uniform, compact, consistent in thickness and good in appearancequality.

Cable mold capable of realizing highly compact and uniform extrusion molding

The invention discloses a radio-frequency coaxial cable for a communication base station, comprising an inner conductor, an insulating layer, an outer conductor and an outer jacket which are sequentially arranged from inside to outside, wherein the inner conductor and the outer conductor are at the position of a concentric circle; the inner conductor has a copper pipe structure, and the ratio of the wall thickness Delta of the copper pipe to the working frequency F, i.e. Delta/F is 0.12-0.22 micrometers/MHz; and the core part of the copper-pipe-like inner conductor is arranged in an infill. The infill is a fiber braided rope. The radio-frequency coaxial cable has reasonable structure and high cost performance, can lower the cost of the cable to the maximum extent and keep fine transmission performance.

Radio-frequency coaxial cable for communication base station

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Optoelectronic composite railway digital cable

Cable mold capable of realizing highly compact and uniform extrusion molding

Radio-frequency coaxial cable for communication base station