The important steps of OPGW cable production process
1. High-speed optical fiber coloring production line
In the construction of the power dedicated communication network, the number of optical fibers is generally 12 to 24 cores. With the demands of new services, the system capacity continues to expand. At present, the number of cores is gradually increasing, and some line segments have even increased to 48-72 cores. In the testing, connection and use of optical fibers, the optical fibers are colored in order to distinguish each optical fiber. Introduce an advanced high-speed fiber coloring production line to ensure that the fiber will not fade or migrate during the entire service life. When the number of optical fibers in the stainless steel tube unit exceeds 12 cores, the optical fibers are distinguished by color ring coloring technology.
2. Composite stainless steel tube optical fiber unit production line
Introduce the world’s laser welding composite stainless steel tube optical fiber unit production line. The innovations of this process are: (1) On-line ultra-length control can obtain the ideal optical fiber length; the inner plastic tube layer protects the optical fiber from laser beam scalding and the sharp edge wear of the stainless steel tube weld; the combination of the stainless steel tube and the inner plastic tube Greatly improve the bending resistance of the loose tube. The thermal expansion coefficient of the inner plastic pipe is lower than that of the stainless steel pipe, so the remaining length of the fiber is more stable. On the basis of the traditional cold drawing process of stainless steel pipes, new progress has been made.
Among them, the fiber unwinding device adopts independent online automatic control for each fiber, and digital display on the screen. The stainless steel tube optical fiber unit can accommodate 36 or more optical fibers. The “online overlength control device” adopts the principle of non-contact measurement to control the overlength of the entire secondary coating production line, eliminating the traditional destructive overlength detection and reducing waste.
Extrude the thermoplastic PBT liner with an extruder, and inject full chromatographic fiber and thixotropic water-blocking ointment at the same time. The fiber length reaches 10‰, and then the high-strength hot melt adhesive is extruded from the outer wall of the PBT pipe with an extruder.
The edge trimming device cuts the stainless steel strip according to the required width. The new trimming device is more conducive to laser welding. In the forming station, the thin-walled metal strip is formed and calibrated through forming and precise roll positioning, and the stainless steel metal pipe is continuously welded online through the laser head of the longitudinal welding machine. Due to the isolation protection of the PBT tube, the optical fiber is not affected by high temperature; after heating, the stainless steel tube is bonded to the inner plastic tube by activating and squeezing the adhesive layer through the calibration table.
3. Mature OPGW cable stranding technology
The key to the stranding process of OPGW cable is to control the pay-off tension of the armored monofilament, the preform, the mold, the stranding speed and the pitch of the inner and outer layers. The introduction of fast stranding machine and fully automatic tension control can meet the cable formation requirements of large cross-section multilayer stranding and high-strength OPGW cable structure; another cable winch meets the needs of producing long OPGW and submarine cables.
The above are the three important working steps of OPGW cable production process. For more OPGW cable knowledge, please contact KSD (Email:sales@ksdfibercable.com)and look forward to your call!
Post time: Oct-25-2020