Special alloy-sheathed through earth wire for railway signal system and manufacturing method for special alloy-sheathed through earth wire

Abstract

The invention discloses a special alloy-sheathed through earth wire for a railway signal system. The special alloy-sheathed through earth wire comprises a cable core which is of an integrated round structure formed by twisting a plurality of soft round copper wires, the cable core is coated with a brass band, and a tubular outer sheath is formed by the coating brass band. The manufacturing method for the through earth wire includes the following steps that the soft round copper wires with the same conductor diameter are selected and twisted into the cable core according to a specified pitch in a specified arrangement mode; stress of the required number of conductors is adjusted, and the conductors are shaped in a twisted mode; the twisted cable core is pressed through a die, so that the pressed round structure is formed for the cable core; a round metal tube is formed by the brass band through multiple dies, the cable core is coated with the metal tube, a sealed tube is formed by the metal tube after the argon arc welding process is conducted, and the welded brass band metal tube is drawn; the drawn through earth wire is placed in an annealing cavity with the temperature of 800 DEG C for annealing; the annealed through earth wire is passivated, and the passivated through earth wire is rinsed and dried.

Description

technical field [0001] The invention relates to a through ground wire for railways, in particular to a special alloy sheath through ground wire for railway signal systems. The invention also relates to a method for manufacturing a special alloy sheath penetrating ground wire for a railway signal system. Background technique [0002] The penetrating ground wire is a grounding cable used in the comprehensive grounding system of railway signals. It grounds the signal equipment at the trackside and station area nearby, so that each working point of the electrical system of the signal equipment along the road can be equipotentially connected, and avoids due to the gap between different equipment. The potential safety hazard formed by the potential difference. [0003] The existing lead-clad copper wire and the polymer sheath pass through the ground wire. Its structure is to coat the copper cable with a layer of lead sheath or conductive polymer plastic sheath. However, because l...

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Problems solved by technology

[0003] The existing lead-clad copper wire and the polymer sheath pass through the ground wire. Its structure is to coat the copper cable with a layer of lead sheath or conductive polymer plastic sheath. However, because lead is a toxic heavy metal, it will Pollution to soil and water

So it was replaced by the polymer sheath penetrating the ground wire; the conductive polymer sheath is a clean material, but due to its large volume resistivity, the conductivity is sometimes not stable enough, once the current cannot be quickly transmitted to the The earth will cause great harm

At the same time as the polymer sheathed through-ground wire, there is also an aluminum alloy sheathed through-ground wire. Since the aluminum alloy is an aluminum-based alloy, its stability is relatively poor among metal materials, and its electrical conductivity is not ideal.

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