ISO 7190:1981 PDF

Overview

ISO 7190:1981 defines a clear, internationally recognized classification system for bucket elevators - a category of continuous mechanical handling equipment used for vertical or inclined transport of bulk materials. Rather than prescribing design or performance limits, the standard organizes bucket elevators by their principal characteristics (construction, discharge type, feeding method and driving medium) and describes the common types encountered in industry.

Key topics and classification criteria

ISO 7190 groups bucket elevators using practical, engineering-focused criteria:

• Construction / path of buckets
  • Vertical straight bucket elevators (near-vertical paths)
  • Inclined straight bucket elevators (approximately 55–70° to horizontal)
  • Gravity bucket conveyors operating in a vertical plane (different levels in same plane)
• Type of discharge
  • Centrifugal
  • Mixed (centrifugal + gravity)
  • Gravity - external
  • Gravity - internal
• Feeding method
  • External direct feed
  • External scraping (dragging) feed
  • Internal feed
• Driving medium / support
  • Round-link chain
  • Other chain types
  • Belt
  • Wire rope (cable)

The standard also describes common machine families and operational characteristics, including:

• Speed categories referenced in examples (e.g., high speed v > 1 m/s; slow speed v