Overhead Line Hold Down Wire Block – Anti-Lift Pulley for Conductor Stringing 10-40KN
Product Overview
The SHY10L series Hold Down Wire Block is a specialized anti-lift pulley designed for overhead transmission line stringing operations. Its primary function is to press down earth wires or conductors during stringing, preventing the upward displacement caused by tension variations. The sheave is mounted on ball bearings for smooth rotation, and the frame is made of high-quality galvanized steel. Equipped with an automatic spring release system, the pulley can be released from the cable automatically when needed.
The sheave is available in aluminum with rubber liner, steel, or MC nylon options, allowing users to select the optimal material for their specific conductor type and operating conditions. Applicable conductors range from ACSR LGJ120 to LGJ720, with rated loads from 10KN to 40KN.
Technical Specifications
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Item No.
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Model
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Applicable Conductor
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Rated Load(KN)
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Weight(kg)
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Remarks
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10241
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SHY10L
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≤ ACSR400
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10
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13
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Aluminum Sheave/Rubber Liner
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10242
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SHY10G
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≤ 14mm
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10
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20
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Steel Sheave
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10243
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SHY25N
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≤ ACSR720
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25
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16
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MC Nylon Sheave
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10244A
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SHY40G
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≤ 28mm
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40
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55
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Steel Sheave
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10244B
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SHY40L
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≤ ACSR720
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40
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39
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Aluminum Sheave
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10244C
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SHY40N
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≤ ACSR720
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40
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34
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MC Nylon Sheave
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Applications
· Hold down upward conductor and ground wire during pulling
· Prevent conductor lifting in overhead transmission line stringing
· Anti-lift protection for earth wire and ground wire installation
· Suitable for angle iron less than 90 degrees
Product Advantages
· Automatic Spring Release System — The pulley is equipped with a spring release mechanism that automatically disengages from the cable, enhancing operational safety and efficiency.
· Multiple Sheave Material Options — Available in aluminum with rubber liner (conductor-friendly), steel (maximum durability), and MC nylon (lightweight, non-conductive) sheaves.
· Ball Bearing Mounted Sheave — Precision ball bearings ensure minimal rotational resistance, reducing wear on both the sheave and the conductor.
· High-Quality Galvanized Frame — The frame is constructed from high-quality galvanized steel, providing excellent corrosion resistance for long-term field use.
Frequently Asked Questions (FAQ)
Q: What is the main purpose of a hold down wire block?
A: It prevents the conductor or ground wire from lifting upward during stringing operations, which can occur due to tension variations or wind.
Q: What sheave material is best for ACSR conductors?
A: Aluminum sheave with rubber liner (SHY10L/SHY40L) is recommended for ACSR conductors as the rubber liner protects the conductor surface.
Q: Can this block be used for underground cable pulling?
A: No, this block is specifically designed for overhead transmission line stringing to prevent conductor lift.
Q: What is the maximum conductor size supported?
A: The SHY25N and SHY40 models support ACSR up to 720mm² (LGJ720), suitable for large cross-section transmission conductors.
Q: Does the spring release work automatically?
A: Yes, the spring release system automatically disengages the pulley from the cable when tension is removed, simplifying the de-rigging process.
Product Tags:
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Hold Down Wire Block with 10-40KN Rated Load, Automatic Spring Release System, and Multiple Sheave Material Options Images
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