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        Belt conveyor sizing                  
                           
        Warning: This calculator gives a rough and initial idea for the design of a belt conveyor.          
        It doesn't intend to replace or compete professional softwares.            
        To go ahead, a more detailed study is needed with a belt conveyor supplier.            
        This calculator is limited to this configuration (horizontal + inclined + horizontal belt, straight):        
       
     
                     
        We only consider concave conveyors with 3 support idlers and belts with smooth surface.      
        The calculator doesn't take into consideration accessories like trippers, skirtboard friction, ploughs.....      
        Calculation valid only for cement components in a grinding installation!     Clinker      
                    Cement      
        Date      Limestone      
        Company/Plant   Clay      
        Project N°     Gypsum      
                    Sand      
        Material
      Slag      
        Percentage % Pozzolana      
        Bulk density kg/m3      
        Angle of surcharge (*)  °      
        (*) see technical books in case of doubt                  
        Output to be treated t/h 300  
        Maximum size of material   mm 400  
        Material bulk density kg/m3 500  
        Desired capacity in volume m3/h 650  
        Belt length     800  
        Length part 1 (horizontal) m   1000  
        Length part 2 (inclined) m 1200  
        Height of elevation m 1400  
        Angle of inclination degrees   1600  
        Length part 3 (horizontal) m Perfectly regular 1800  
        Total length m Regular 2000  
        Total length (horizontal) m Moderately regular 2200  
        Regularity of the feed
    Rather irregular            
        Select the belt speed m/sec Very irregular     20      
        Theoretical capacity m3/h     25      
    30
        Angle between carrying idlers (λ)
    °       35      
        Select the width of the belt
    mm       40      
        Material cross section on the belt (*) m2              
        (*) From this table    -------------------------->
     
                   
        Material cross section by the user (*) m2   Value of table        
        Choose the section for calculation
    Value of user          
        (*) If the user doesn't agree with the proposed section above                
        Weight of material per meter kg              
        Recalculation of the capacity (*) t/h              
        (*) Modify width and/or speed of the belt + angle idlers in order to reach the output to be treated      
        Pulleys diameter        
        Drive pulley diameter mm    
        Drive pulley rotation speed rpm    
        Tail, Tension pulleys diameter mm    
        Snub, bend pulleys diameter mm    
        Idlers        
        Diameter mm    
        Idler rotation speed rpm    
        Distance between support rollers mm          
        Distance between return rollers mm          
     
        Belt weight per meter suggestion (*) kg   Value from calculator        
        (*) If you have another value, enter it below       Value from user        
        Belt weight per meter of user kg/m            
        Choice of belt weight per meter
               
        Weight of carrying idlers (per m) kg/m            
        Weight of return idlers (per m) kg/m              
        Weight of moving masses (per m) kg/m              
     
        Calculation of the required power     70            
    75  
        Power for empty belt kW 80 No        
        Power to move the material kW 82 Simple, normal contact      
        Power to raise the material kW 84 Scrapper heavy contact      
        Type of cleaning devices
    86            
        Power for cleaning devices kW 88            
    90  
        Total power kW 91 150    
        Efficiency of motor and transmission
    % 92 160    
        Absorbed power at terminals kW 93 170    
        Installed power (standard) kW 94 180    
    95 190
        Calculation of the tensions     96 200    
    210
        Tension to move empty belt N   220    
        Tension to move load horizontally N   230    
        Tension to lift load N   240    
        Tension for accessories N          
        Effective tension N          
     
        Minimum belt tension N           1  
    1
        Other tensions (*)               2  
        (*) Only simple drive arrangements or with a snub pulley are considered for the next calculation (with lagged pulley - dry conditions) 2  
        Wrap angle 
    °           2  
        Slack side tension (T2) N           2  
        Tight side tension (T1) N           2  
        Unit operating tension N/mm              
        Nominal breaking strength N/mm              
        T3 tension N              
        T4 tension N              
        Counterweight tension N              
        Start-up factor
        20          
        Peripheral Force in non-steady state     25          
        Acceleration m/s2   30          
        Start-up time sec   35          
        Start-up distance m   40          
                45          
        Estimation of the belt conveyor capacity     97            
        Note: In function of measurements on site                  
        Note: Only for belt with smooth surface and 3 support rollers                
     
        Type of material (*)
      Cement  
        Material bulk density t/m3   Clinker  
        (*) Take into account the most important component       Gypsum  
        Angle of support rollers
    degrés   Slag  
        Width of the belt
    mm   Pozzolana  
        Measured calculated material section m2   Limestone    
        Regularity of the feed
      Fly ash        
        Speed of the belt m/s   Limestone filler      
        Angle of inclination degrees          
        Estimated volume capacity m3/h              
        Estimated theoretical capacity t/h              
        Estimated present capacity t/h              
                           
    NB: This calculator is still being improved 
                         
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    All rights reserved © 2012-2015 The Cement Grinding Office