The world's largest braking system is installed on the Los Pelambres, Chile 25000 kW downhill on three flights.
The brake design is a CDI proprietary system which uses novel concepts, CDI control algorithms and hardware specifications:
1. A digital and analog hydraulic fail-safe concept.
2. Quick-response system for such large systems. Quick response is used to evacuate the hydraulic fluid in a low millisecond time cycle, not possible with normal brake action due to fluid inertia valve timing and flow, and spring response delay.
3. Control of mechanical over-braking which would otherwise lead to excessive stress on belt, ts splices and mechanical components. This occurs when emergency braking might be applied and all tolerances build up to an unacceptably low belt safety factor (< 4:1).
Other large CDI and Partners downhill systems are:
1. Collahuasi (8000 kW) with Krupp in Chile
2. El Abra (7500 kW) auditor to Cyprus Mining Co and ManTakraf
3. Phelps Dodge, Morenci (6000 hp) with Fluor, in Arizona, USA
4. Kennecott ( 2 x 6000 hp) in Salt Lake City, USA PWH/Krupp/Robins
5. Quintette ( 2 x 3500 hp) in Canada redesign of a French system
6. Capito do Mato, Pico and Matuca for MBR and MGS in Brazil
7. many others for overland dynamic controls and sequencing
1. Johnson Brakes, Canada
2. Bubenzer, Germany
3. Svendborg then Asea
4. Twiflex, USA
5. SIME, France
6. Voith was used on Kennecott and Palabora but I am not aware of recent activity
Conveyor Dynamics, Inc.
website, email & phone contacts:
phone: USA 360-671-2200
fax: USA 360-671-8450