Rectangular Tubular Frame Assembly with Dual Sheave Pulley Assembly and Parallel Longitudinal Crossbars

Steel tube section selection for a dual sheave pulley assembly frame determines weld joint quality and fatigue life under cyclic load; S355 rectangular hollow section provides the wall thickness needed for full-penetration girth welds at the crossbar junction, while S235 suits lighter applications where the pulley operating load is below the frame's service classification threshold. Shanghai Hanshen (Shanghai, founded 1991) fabricates this dual sheave pulley assembly with rectangular tubular frame and parallel longitudinal crossbars using gantry milling, boring and milling machining, and CNC milling at their in excess of 30,000 m² Shanghai facility, with crossbar pitch, sheave bore alignment, and frame squareness confirmed against your released print during in-process inspection. EN 1090, ISO 3834, and ISO 9001 certifications govern structural execution, weld quality, and traceability for elevator, railway, machinery, and general industry pulley assembly applications. Attach your print specifying frame dimensions, sheave specification, crossbar pitch, and material grade. For a fabrication project estimate from our shanghai team. The plant works across energy saving and environmental protection, energy storage, and logistics sectors.