 |
Seven Sheave 660 Series Conductor Stringing Block 75KN Load for UHV Bundle Conductor Pulling
Product Details:
| Place of Origin: | Ningbo, China |
| Brand Name: | Suntech |
| Certification: | ISO 9001:2015 |
| Model Number: | SHQ660A |
Payment & Shipping Terms:
| Minimum Order Quantity: | 1 PCS |
|---|---|
| Price: | Negotiable |
| Packaging Details: | Reinforced plywood case with marked lifting points and sheave impact protection |
| Delivery Time: | 3-7 days for stock models, 20-25 days for production |
| Payment Terms: | L/C,T/T |
| Supply Ability: | 300 PCS per Month |
|
Detail Information |
|||
| Series: | 660 Series | Model: | SHQ660A |
|---|---|---|---|
| Number Of Sheaves: | 7 | Rated Load: | 75 KN |
| Block Weight: | 190 KG | Sheave Diameter: | 660mm |
| Conductor Sheave: | MC Nylon | Centre Sheave: | Cast Steel |
| Axle Material: | 40Cr Forged Steel | Bearing: | Double Sealed Spherical Roller Bearing |
| Frame Finish: | Hot Dip Galvanized | Warranty: | 1 Year |
| Highlight: | Seven Sheave Conductor Stringing Block,75KN Load Stringing Block,660 Series Conductor Stringing Block |
||
Product Description
Seven Sheave 660 Series Stringing Block for Multi Bundle UHV Conductor Pulling
The SHQ660A is the seven sheave member of the 660 Series frame. It was developed for the multi bundle spans on 750kV and 1000kV lines, where six or eight sub conductors have to run at the same time and every sheave has to hold its own share of a 75KN pull. The outer six wheels are MC nylon, the centre wheel is cast steel, and the assembly sits on a forged 40Cr axle inside a reinforced galvanized frame. Practical result: one block replaces a pair of three sheave units on the crossarm, the bundle stays parallel, and the crew makes one lift instead of two.
Model Data and Comparison
| Item No. | Model | Sheaves | Rated Load (kN) | Weight (kg) | Groove Configuration |
| 10130 | SHQ660A | 7 | 75 | 190 | Centre cast steel sheave, six MC nylon conductor sheaves |
| 10128 | SHWQN660 | 5 | 60 | 110 | Five MC nylon sheaves |
| 10127 | SHSQN660 | 3 | 40 | 70 | Three MC nylon sheaves |
All three share the 660mm sheave diameter, so groove radius, hanger hardware and crossarm spacing stay common across a fleet. Load figures are per block with conductors seated in the grooves.
Engineering Behind the Seven Sheave Layout
-
Balanced bundle geometry: seven grooves at 660mm diameter keep sub conductor spacing close to the design spacing of the bundle, which limits conductor oscillation in the span and helps the final sagging match the stringing calculation.
-
Load shared on a forged axle: the 75KN rated load is carried by a 40Cr forged axle rather than a tube, with the frame gusseted at the axle seats. Under proof load the frame shows no permanent set at the hanger eye.
-
Sealed rolling bearings: double sealed spherical roller bearings take both radial and small axial misalignment, so the wheels keep turning even when the block hangs slightly out of plumb on an angle structure.
-
Mixed wheel materials by design: MC nylon wheels protect the aluminium strands, while the cast steel centre wheel handles the wear from spacers, running boards and the occasional steel rope lead.
-
Positive conductor retention: each groove is closed by a keeper with a locking pin, so a slack conductor cannot lift out of the sheave when tension is released during changeovers.
Selection Guidance
A 1000kV eight bundle span normally uses the SHQ660A with a pair of matching three sheave units; a six bundle line can run on the seven sheave block alone plus one single sheave block at the lead position. Match groove radius to the sub conductor diameter, keep the first block at least ten times the sheave diameter behind the tensioner, and confirm hanger bolt diameter against the crossarm drawing before ordering. If the site has long pulls with high tension, we recommend the seven sheave unit even on six bundle lines for the extra safety margin.
Quality Control and Inspection
Each SHQ660A is assembled from inspected castings, forged axles and nylon blanks. The axle is dimensionally checked and dye penetrant inspected before assembly, the frame is checked for hanger eye alignment, and the finished block is proof loaded and the sheaves spun under load to confirm bearing seating. Blocks ship with a nameplate showing model, rated load and serial number, plus an inspection sheet; a 1.5 times rated load certificate and third party inspection reports can be provided against the order drawing.
Packing, Handling and Service
At 190kg the unit is packed in a reinforced plywood case with lifting points marked, and the sheave faces are protected against impact in transit. Stock units move in 3 to 7 days, with monthly capacity around 300 pieces. Spare sheaves, bearings, axles and keeper pins are held as service parts, so a worn wheel can be swapped on site instead of replacing the whole block.
Frequently Asked Questions
Can the seven sheave block be supplied with all cast steel wheels? Yes, a steel wheel build is available for steel rope and mixed duty, on request against the order drawing.
Is a custom groove radius possible? Groove radius, marking language and hanger dimensions can be made to the buyer drawing for orders above the standard MOQ.
What is the service interval? Bearings are sealed for life; the sheaves, keeper pins and hanger eye should be inspected before each project and after any overload event.
Want to Know more details about this product