Practical 13 Determination of Capacity of a bucket conveyor and its performance evaluation.ppt

APE 311 Protected Cultivation and Secondary
Agriculture (1+1)
Practical - 13
Determination of Capacity of a bucket conveyor and its
performance evaluation

Determination of capacity of a belt conveyor
AIM:
To determine the capacity and evaluate the performance
of the given bucket elevator by determining the
conveyance efficiency.
THEORY:
Bucket elevator is the only equipment used in material
handling to convey the material in vertical direction.
It consists of a series of buckets or cups arranged in an
endless belts, moving between two flat pullies.

Determination of capacity of a belt conveyor
THEORY:
The cups will be filled with the grains during upward
movement from the hopper and discharged at the top
due to centrifugal force.
The capacity of the elevator depends on the size of
bucket/cup and speed of operation.
For proper discharge of the material, the weight of the
material in each cup should be equal to the centrifugal
force created by the rotation as,

THEORY
Since the weight of the material in each cup is equal to the
centrifugal force,

THEORY
The above equation ( 5 ) gives the relationship between the
speed and size of the pulley for proper discharge of material
by centrifugal force,

THEORY
The quantity of material held in the cups for 1 metre length
of belt,
If the belt moves at V m/minute speed, the theoretical
capacity of the conveyor,

Bucket elevator
The bucket elevator’s capacity may be calculated by the
following equation.
Elevator capacity, m3
/hour = bucket capacity, m3
x
number of bucket per meter of belt x belt speed, m/min. x
60

DESCRIPTION
The lab model bucket elevator consists of a feed hopper,
cup assembly, cover, outlet etc.
Cups of parabolic cross section with dimensions are
mounted on the endless flat belt at a spacing of 12 cm.
The flat belt of width 14 cm is run between the flat pullies
of diameter, 6.5 cm, rotating at a speed of 95 rpm.
The power to the head pulley (top pulley) is transmitted
by a V-belt from a 0.25 hp motor.
Inspection doors are provided to inspect the cups and belt
periodically. The whole assembly mounted on a frame.

PROCEDURE:
Load the feed hopper of the bucket elevator with the
given material and the unit to the mains through Watt
meter or Ammeter and Voltmeter.
Place the collection box at the discharge outlet.
Take three samples of the given material for the
determination of bulk density.
Run the bucket elevator without load and note the watt
meter or ammeter and voltmeter readings.

PROCEDURE:
Open the feed regulator in the feed hopper and convey
the material and note the time taken to convey all the
material.
Also note the power required from the meters at load.
From these observations, the efficiencies can be
calculated.

OBSERVATIONS AND CALCULATIONS:
Volume of material held in 20 cm long bucket,
v = 750 cm3
Mass of material conveyed by the bucket conveyor,
M= 240 kg
Speed of conveying, V = 500 m/min
Spacing between cups, s = 12 cm
Time taken in minutes to convey the material, T = 180 min.
Bulk density of the seed/grain conveyed, ρ = 0.51kg/m3

Bulk density of the given seed/grain
Sample
Replicati
on
Volume of
container,
cc
Mass of
container +
sample, g
Mass of
sample, g
Bulk density
Mass / Volume (g/cc)
1 500 584 266 0.53
2 500 574 256 0.51
3 500 570 252 0.50
Mean 0.51

Capacity of conveying material by the bucket conveyor,
Q theo = 95.625 kg/h

The actual capacity of bucket conveyor,
Q actual = (M / T) 60 kg/h.
Q actual = 80 kg/h.
Thus the conveying efficiency,
ηConveying = (Qactual / Qtheo) x 100 %
ηConveying = (80 / 95.625) x 100 %
ηConveying = 83.66 %

RESULTS:
The conveying capacity and the conveying efficiency of
the belt conveyor are determined as 80 kg/h and 83.66 %

Practical 13 Determination of Capacity of a bucket conveyor and its performance evaluation.ppt

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Practical 13 Determination of Capacity of a bucket conveyor and its performance evaluation.ppt