Vertical silica gel extrusion production line for cables

The utility model discloses a vertical silica gel extrusion production line for cables. The production line comprises a pay-off reel, a first traction machine, an extruder, a vulcanizing device, a second traction machine and a take-up reel which are sequentially mounted, wherein the vulcanizing device comprises an ascending vulcanizing section, a descending vulcanizing section and a reversing wheel, the preheater comprises a water cooling box, a heating box and a copper pipe coil, the heating box is arranged on the water cooling box, the copper pipe coil is arranged in the heating box and is electrified with high-frequency current, the inner diameter of the copper pipe coil is larger than the outer diameter of a cable, and the copper pipe coil is communicated with the water cooling box. The production line disclosed by the utility model can synchronize the vulcanization speed and the crosslinking degree of the inner layer and the outer layer of rubber; therefore, the stress differencebetween the inner layer a