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DSI Expanded Conveyor Technology

 

More than an analysis tool, the DSI Expanded Conveyor Technology reflects a philosophy. Our comprehensive approach takes the conventional conveyor technology beyond the currently percieved limits. Utilizing derived load equivalents, we are first to address and predict the extra flexural and shear resistances along vertical and horizontal curves. Our analysis models and software incorporate added features including "Engineers Discretionary Factors", an allowance for incorporating the results of field testing or simply our client's philosophy.
Material coal   Belt width 914 mm
  -Density .88 t/m^3 Belt speed 3.05 m/s
Conveying rate 771 t/h Tension rating 175 kN/m
CEMA area
  -20 deg surcharge		 0.091 sq. m Ambient temperature -17.8 deg C
%CEMA load 87.5 % Temperature factor 1.35  

Tensions Summary
  Running
(kg)		 Empty
(kg)		 Accel
(kg)		 Braking
(kg)		 Drifting
(kg)
T1 14105.3 9078.2 19028.7 1981.9 5201.1
T2 3723.2 3573.1 2940.2 10143.6 3861.1
Tmax 14105.3 9078.2 19028.7 10436.9 5201.1
kN/m 151.3 97.4 204.2 112.0 55.8
           
Accel/Decel Time (secs) N/A N/A 19.5 6.9 10.6
           
Shaft KW 314.5 167.8 509.1 -244.2 0.0
7.0 % losses 22.0 11.7 35.6 17.1 0.0
Motor (+) / Brake (-) kW 336.5 179.5 544.7 -227.1 0.0
           
Selected motor kW 391.6 391.6 391.6 391.6 391.6
           
Node 1, T-U tens (kg) 3856 3856 3856 3856 3856
Conveyor stretch (m) 9.2 8.4 12.0 7.1 4.5
Take-up stretch (m) 4.6 4.2 6.0 3.5 2.3


ChartObject Conveyor Profile

ChartObject Tensions Running Loaded

ChartObject Tensions Accelerating Loaded

ChartObject Tensions Braking Loaded

ChartObject Tensions Drifting to Stop Loaded
 

Special features of the DSI "Expanded Conveyor Technology"

  1. Each run produces a complete tension and power analysis under steady state, starting and stopping conditions. Stopping is by braking and by drifting. Starting and stopping analyses utilize rigid body dynamics.
  2. Sequential runs, using macros, allow real time analysis and graphical display of changing load conditions including load-on, trailing-off and any discontinuity of material flow. This feature allows us to spot, quickly, the aggravations of flow discontinuities.
  3. Virtual material loads, or "load equivalents" are used to account for belt line resistances associated with the curving profile or plan of the conveyor line. These (previously unaccounted for) resistances become significant at horizontal curves where the effect is always increased resistance.
  4. Ky, flex and shear resistance factors differ from CEMA reflecting DSI experience and philosophy.
  5. In the analysis, belt tension becomes negative (compressive) when it drops below 0. This, though not realistic (as belt becomes slack), allows continued analysis indicating the tension increase required to correct the slack belt problem.
  6. An in-put section entitled "Discretion by Responsible Engineer" offers the user an opportunity to affect the analysis by use of adjustment factors on the Ky and Kx values and on the terminal resistances. These factors can be used to alter the results according to known characteristics of the conveyors being analyzed, to reflect the user's design philosophy or to achieve matching of field monitored data.
 

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