Adjustable Earth Wire Stringing Cable Pulley Block
An adjustable earth wire pulley block is a specialized tool used primarily in the installation and stringing of earth wires (also called grounding wires) on power transmission lines. It serves to spread and tension earth wires while allowing for the mounting of accessories via an adjustable screw mandrel.
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An adjustable earth wire pulley block is a specialized tool used primarily in the installation and stringing of earth wires (also called grounding wires) on power transmission lines. It serves to spread and tension earth wires while allowing for the mounting of accessories via an adjustable screw mandrel. Here are the key features and uses based on available information:
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: The pulley block includes a fluctuating screw mandrel that enables adjustment during installation, which helps in spreading the earth wire and mounting accessories securely.
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: The sheave (the wheel on which the wire runs) is typically made from materials such as aluminum alloy, nylon, or cast steel. For example, some models use aluminum sheaves while others use nylon sheaves, depending on the application and load requirements.
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: Commonly, these pulley blocks have a rated load around 10 kN, suitable for typical earth wire sizes (e.g., GJ25-70 stranded wire).
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: Sheave diameters are often around 100 mm with widths about 30 mm, and the adjustable stroke (fluctuating stroke) can be approximately 65 mm.
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Used to spread and tension earth wires during overhead power line construction.
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Can be mounted on power towers or poles to guide the earth wire safely and reduce abrasion.
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The adjustable feature allows for fine-tuning during installation to accommodate different wire sizes and installation conditions.
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Helps in eliminating induced static electricity or faradism in conductors and grounding wires by providing a grounding path during stringing operations.
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Some models come with a cast steel sheave for enhanced durability and abrasion resistance, especially in extreme weather conditions.
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The pulley block can be part of a larger stringing block system that may include multiple sheaves for handling bundled conductors or multiple wires simultaneously.
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The adjustable earth wire pulley block can also be used in conjunction with tensioners and pullers on the power line stringing setup.
In summary, an adjustable earth wire pulley block is a versatile and essential tool in power line construction, designed to facilitate the proper installation and tensioning of earth wires with the ability to adjust to varying conditions and wire sizes. It combines durable materials like aluminum, nylon, or cast steel sheaves with a screw mandrel mechanism for precision and reliability during stringing operations
