Product Information
Product Overview
Live‑Line Insulated Pulley Block (hook‑type insulated tackle) is essential mechanical tool for live‑line maintenance of high‑voltage overhead power network. This product integrates rotating hook assembly, metal side frame, wear‑resistant sheave and insulating bar components. Distinguished from ordinary steel hoisting pulley, key load‑bearing connection section is equipped with reinforced insulating parts, effectively isolating high‑voltage electric potential between hoisting rope and ground operating personnel. It can complete lifting, transferring and positioning work of hardware, insulator strings and construction auxiliary parts without power‑off operation.
This series covers single‑sheave, double‑sheave, triple‑sheave and four‑sheave configurations, adapting to different hoisting weight and rope‑route layout requirements. All structural dimensions and mechanical performance comply with live‑working tool industry specifications. Export‑oriented products are widely sourced by power utility corporations, live‑working service contractors and overseas EPC bidders. Operators shall strictly follow rated working load, and shall not apply overload or impact hoisting. It can be matched with synthetic fiber hoisting rope for live‑line construction scenarios
Manufacturing Process
Metal components go through hot forging, CNC machining, deburring and anti‑corrosion treatment. Forged hooks pass magnetic‑particle flaw detection to eliminate hidden crack defects. Insulating bars are formed by integral moulding, followed by precise cutting, surface polishing and strict insulation performance screening. Sheave groove is machined with smooth camber to avoid cutting fiber hoisting rope. Rolling‑bearings are pre‑installed inside sheave hub to guarantee flexible rotation. Finished goods go through multi‑item inspection: mechanical static load test, insulation voltage withstand test, appearance & dimension check. Defective units will be eliminated before packing
Features & Advantages
- Integrated insulating‑bar structure, stable high‑voltage isolation performance, adapt to live‑wire overhaul work of high‑voltage transmission lines.
- Forged alloy‑steel rotating hook with anti‑drop safety latch, hook can swivel 360°, preventing rope twisting during hoisting operation.
- Built‑in rolling bearing inside sheave, low rotational resistance, flexible rotation, effectively reduce labor intensity for field operators.
- Smooth aluminum‑alloy sheave groove, minimize abrasion damage to synthetic fiber hoisting ropes, extend rope service cycle.
- Strict dual‑test for each batch: mechanical static load test and high‑voltage insulation withstand test. Product safety performance is traceable.
- Compact whole‑machine layout, convenient for transportation and field carrying, suitable for mountain, wild‑field overhead‑line maintenance scenarios
Application Scenarios
Mainly used for live‑line maintenance of 10kV‑110kV overhead transmission & distribution power lines. For hoisting and replacing insulators, power fittings, construction tools during non‑power‑cut overhaul. Suitable for utility power‑station maintenance teams, live‑working service companies, overseas power EPC projects, remote mountain‑area power‑grid emergency repair tasks. It is only applicable for static hoisting operation, shall not be used for impact‑type heavy‑load lifting. Cannot work under soaking wet condition without extra protective measures
Southeast Asia urban power‑grid live‑maintenance project. Total 420 sets of single‑sheave and double‑sheave Live‑Line Insulated Pulley Blocks were supplied. Tools are adopted for insulator replacement under live‑wire condition for 35kV overhead lines. Field inspection feedback shows stable insulation performance after one‑year continuous application.
Domestic mountain‑area power‑grid emergency‑repair project. Triple‑sheave and four‑sheave insulated pulley blocks are deployed for heavy‑weight fitting hoisting in live‑working tasks. It greatly shortens power‑repair time and avoids large‑scale user power cut‑off
Central‑Asia power‑grid live‑repair tender project. 365 sets including single‑sheave, double‑sheave and triple‑sheave Live‑Line Insulated Pulley Blocks are delivered, for insulator and fitting replacement of 66kV overhead lines. The project has run for 18‑month live‑maintenance task without safety‑related tool failure
Overseas mountain photovoltaic‑station supporting power‑line maintenance project. Four‑sheave insulated pulley blocks are adopted for heavy‑component hoisting during live‑working, shortening maintenance time and avoiding photovoltaic‑plant power‑generation loss caused by power‑cut
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