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

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.

Ningbo Suntech Power Machinery Tools Co.,Ltd. is one of the leading and preferred manufacturers and suppliers in China,and deal with electrical facilities products start from year 1995.We have own main product line for stringing blocks,hydraulic Cable Stands,Anti Twist Steel Wire Rope,etc with one of biggest warhouses about stringing tools for trasmission line construction for one-site purchase in China.

Now our goods export to 120 countries and we have more than 3000 clients. Our detailed product range include conductor stringing blocks,cable roller,hoisting tackles,pulley blocks,conductor grippers,cable reel stand,gin poles,inspection trolleys,hydraulic puller tensioner,conductor compressors,cable pulling winch,anti twisting wire steel rope and other construction tools and equipment company for electric power construction.

1) The company is equipped with high precision vertical machining center, horizontal machining center, CNC honing machine, CNC lathe, CNC milling machine and other advanced equipment, also equipped with a large horizontal lathe, lathe, punching machine, rocker large crane and polishing machine, electric welding machine and other general equipment, and the design and manufacture of nylon wheel casting machine and other special processing equipment and technology install.

2) The company's existing testing methods are in good condition, detection equipment is advanced and complete, the company set up the measurement room, laboratory, equipped with a horizontal tensile testing machine, tensile testing, vertical lifting tower hydraulic universal testing machine, hardness tester, salt spray test machine, hydraulic integrated test and testing equipment, from raw material incoming inspection to the factory inspection of products, can fully guarantee the quality control of parts and product performance.

3) The professional R & D capability is the premise of product innovation and technological progress. Many products of the group have their own intellectual property rights. They have obtained 6 invention patents, nearly 20 patents on utility models and designs. And many times included in the Ningbo municipal new product trial production plan and the national key new product plan.

On the basis of the implementation of the ISO9000 quality system management, the company carries out the special TS16949 management system of the automobile industry at a higher level.Welcome to Inquiry,please do not hesitate to contact me soon. Best regards,Peter Mao!