Self-supporting optical cable sheath extrusion die

Abstract

The invention discloses a self-supporting optical cable sheath extrusion die which structurally comprises a supporting seat, an upper module and an injection molding port. The upper module is movablymatched with the top of the supporting seat. When the die is used for injection molding of a sheath, as a polypropylene solution is easy to be scorched into particles and accumulated on the inner wallof a forming cavity, the polypropylene solution flows to push an eliminating block to move along the inner wall of the forming cavity and a brushing block on the top of a moving block of the eliminating block eliminates the scorched particles on the inner wall of the forming cavity to reduce the probability that the scorched particles are accumulated on the inner wall of the forming cavity, so that injection forming of the sheath is protected favorably. A using time of the protecting sheath is not changed. As the particles brushed by the brushing block fall downward and are easily blended inthe solution, the scorched particles in a clamping block are collected, and the scorched particles blended in the solution are reduced, so that the quality of injection molding of the protecting sheath is protected. A baffle plate changes along with a moving position of an eliminating ring, so that a chip inlet of the clamping block is opened and closed, and therefore, the particles are collectedfavorably and backflow of the particles is reduced.

Description

technical field [0001] The invention belongs to the field of moulds, and more specifically relates to a self-supporting optical cable sheath extrusion die. Background technique [0002] In long-distance communication, due to the long distance and the need to bear the load of itself and the outside world, self-supporting optical cables are often used for information transmission. Since the optical cables are installed outdoors for a long time, polyethylene optical cable protective sleeves are used to protect the optical fibers inside the optical cables. The polyethylene is heated and extruded through the sheath extrusion die to make a sheath, and then the cable is passed through the inside of the sheath; in the prior art, when the sheath extrusion die is used to extrude heated polyethylene, since the mold is made of steel Absorb a lot of heat, causing the temperature inside the mold to be higher than the temperature of the injection port and outlet of the mold, and the heat r...

AI Technical Summary

Problems solved by technology

[0002] In long-distance communication, due to the long distance and the need to bear the load of itself and the outside world, self-supporting optical cables are often used for information transmission. Since the optical cables are installed outdoors for a long time, polyethylene optical cable protective sleeves are used to protect the optical fibers inside the optical cables. The polyethylene is heated and extruded through the sheath extrusion die to make a sheath, and then the cable is passed through the inside of the sheath; in the prior art, when the sheath extrusion die is used to extrude heated polyethylene, since the mold is made of steel Absorb a lot of heat, causing the temperature inside the mold to be higher than the temperature of the injection port and outlet of the mold, and the heat resistance of polyethylene is not high. When the polyethylene passes through the mold, the temperature is too high and the polyethylene is easy to burn , the burnt particles are stuck on the inner wall of the mold, resulting in uneven outer surface of the protective sleeve extruded later, accelerating the reaction with air and aging, and reducing the service life of the protective sleeve

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