Angled Crossarm Mounted Stringing Pulley Block In Overhead Power Line Construction Stringing Operations
An angled crossarm mounted stringing block is a heavy-duty pulley device used in overhead power line construction to guide and support conductors during stringing operations. It is specifically designed to be mounted on the crossarm of transmission or distribution poles or towers at an angle, facilitating conductor installation and tensioning.
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An angled crossarm mounted stringing block is a heavy-duty pulley device used in overhead power line construction to guide and support conductors during stringing operations. It is specifically designed to be mounted on the crossarm of transmission or distribution poles or towers at an angle, facilitating conductor installation and tensioning.
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: Typically made of aluminum alloy or MC nylon sheaves mounted on ball bearings, with a galvanized steel frame for durability and corrosion resistance.
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: The pulley block is mounted on the crossarm at an angle, which helps align the conductor path and reduces friction during stringing. The sheave groove may be lined with neoprene or wear-proof nylon/aluminum inserts to protect the conductor.
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: Rated loads commonly range from 0.5 tons (5 kN) up to 2 tons (20 kN), suitable for various conductor sizes such as ACSR 25-185 or 25-240 mm².
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: Lightweight design, for example, about 2.4 kg for a 10 kN rated block, or around 3 kg for 0.5 to 2 ton models.
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: Outer diameters typically range from 80 mm to 120 mm or larger, depending on the model and conductor size.
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: The blocks can have fixed, swivel, or hook-mounted connections with safety locks for secure attachment to the crossarm.
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: Used for stringing conductors on transmission line towers or poles, especially for small to medium conductor sizes. They help reduce conductor wear and facilitate smooth pulling during installation.
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| Feature | Details |
|---|---|
| Rated Load | 5 kN (0.5T) to 20 kN (2T) |
| Conductor Size Range | ACSR 25 mm² to 240 mm² |
| Sheave Diameter | 80 mm to 120 mm |
| Weight | 1.1 kg (nylon) to 3 kg (aluminum) |
| Materials | Aluminum alloy or nylon sheave; galvanized steel frame |
| Mounting Options | Fixed, swivel, or hook with safety lock |
Angled crossarm mounted stringing blocks are essential tools in power line construction, providing a reliable and efficient means to guide conductors during stringing operations. Their robust aluminum or nylon sheaves with ball bearings reduce friction and conductor damage. The angled mounting on crossarms improves conductor alignment and handling. These blocks come in various load ratings and sizes to accommodate different conductor types and project requirements, ensuring safe and effective overhead line installation.
