Both "Cable Rollers" (for underground) and "Stringing Blocks" (for OHTL) are fundamental pulling accessories, and their performance and lifespan have been significantly boosted by innovations in materials and design:

• Advanced Polymer Linings: The most impactful advancement is the use of high-performance polymers for the sheave (wheel) linings. Materials like specialized polyurethanes, Ultra-High Molecular Weight Polyethylene (UHMWPE), and MC Nylon offer:

  • Extremely Low Friction: Minimizes the pulling force required, reducing stress on both the cable/conductor and the pulling equipment.

  • Superior Abrasion Resistance: Protects the outer jacket of cables and the strands of conductors (especially sensitive ones like OPGW and HTLS) from nicks, scratches, and wear.

  • Enhanced Durability: These linings have significantly longer wear lives, reducing replacement frequency and maintenance costs.

  • Reduced Noise: The polymer interface also contributes to quieter operation, an environmental benefit.

• Lightweight High-Strength Alloys: Frames and structural components are increasingly made from aerospace-grade aluminum alloys or high-tensile, galvanized steel. This reduces the overall weight, making the accessories easier and safer to handle, transport, and install, while maintaining exceptional strength and load capacity.

• Sealed, Maintenance-Free Bearings: High-quality, sealed bearings (e.g., precision ball bearings or tapered roller bearings) are now standard. They ensure smooth, consistent rotation with minimal friction, and their sealed design protects against dirt, moisture, and corrosion, leading to extended, maintenance-free operation.

• Modular and Adjustable Designs: Some modern rollers and blocks offer modular designs, allowing for easier replacement of individual worn components or adjustment to accommodate varying cable/conductor diameters or configurations (e.g., multi-sheave blocks for bundled conductors).

• Corrosion-Resistant Coatings: All metallic components are treated with advanced galvanization, powder coatings, or specialized paints that offer superior resistance to environmental factors, significantly extending the accessory's lifespan in harsh conditions.

These advancements lead to more efficient, safer, and longer-lasting pulling accessories, ultimately reducing project costs and improving the integrity of the installed cables and conductors.