Micro-cable, manufacturing method therefor, and filling device

A filling device, comprising a sealant-injection and stranding mold, a sealant injection valve, a sealant pump, and an air source, wherein the sealant-injection and stranding mold is internally provided with a filling channel and a sealant injection channel, the filling channel comprises a filling inlet and a filling outlet, a central strengthening member and a plurality of optical units penetrate into the filling channel from the filling inlet and out of the filling channel from the filling outlet;

• a first end of the sealant injection channel communicates with the sealant injection valve, and a second end communicates with the filling channel;
• the sealant pump and the air source both communicate with the sealant injection valve;
• the sealant pump is used for pumping a sealant into the sealant injection valve;
• the air source is used for adjusting an air pressure in the sealant injection valve to control a sealant dispensing speed of the sealant injection valve;
• and the filling channel is used for filling twisting gaps between the plurality of optical units with the sealant.

A method for manufacturing a micro-cable, comprising following steps:

• providing a central strengthening member and a plurality of optical fibers;
• evenly laying out the plurality of optical fibers, and making the plurality of optical fibers to pass through a stranding mold, so that the plurality of optical fibers are arranged in a bundle shape at intervals;
• pulling the plurality of optical fibers arranged in a bundle shape at intervals into a coating mold, so that the plurality of optical fibers are distributed in a bundle shape at intervals in a curable resin to form an uncured optical fiber bundle;
• making the uncured optical fiber bundle to pass through a curing device to form a cured optical fiber bundle;
• pulling the cured optical fiber bundle into a first extrusion mold, and extruding a secondary coating layer on a peripheral surface of the cured optical fiber bundle, the cured optical fiber bundle and the secondary coating layer together forming one optical unit;
• twisting a plurality of optical units around the central strengthening member, and filling twisting gaps between the optical units with a sealant, the central strengthening member, the plurality of optical units, and the sealant together forming a cable core;
• and
• extruding an outer sheath on a peripheral surface of the cable core, the outer sheath and the cable core together forming a micro-cable.