DETERMINATION OF TRAVELLING
SPEEDS OF BOTH BELT STACKER
AND BOOM BELT
By Li Yimin
200135 By Li yimin INSUE
In recent year, blending stackers are widely used in raw material yard of
metallurgical enterprises as an equipment to blending stacking material.
When blending stacker works the equipment travels to and fro along the rail
of the train from the beginning to end. At the same time the equipment send
the material sent by ground conveyor to boom conveyor and to yard . According
to different stacking workmanship , stacking material may be divided in to two
ways, ie.herringbone stacking way and rhombus stacking way , etc. .In order to
make the volume of the stacked material equal, we must reasonably determine the
velocity that the train forwards and backward ,so that the material could be
stacked evenly and reach a better result.
1.INSTANTANEOUS STACKING CAPACITY
Stacking capacity when the train stop :
Qt=60ArV_{0 } t/h (1)
Stacking capacity when the train goes forwards :
QQ=60Ar(VoV_{1}) t/h (2)
Stacking capacity when the train goes backward :
Qb=60Ar(V_{0}+V_{2}) t/h (3)
In the formula :
Asection area of the material on the belt of ground conveyor;
rvelocity of ground conveyor ,t/m^{3};
V1velocity when the train of the stacker goes forward , m/min;
V2velocity when the train of the stacker goes backward , m/min;
when the direction that the train of the stacker and the direction of the belt of
the ground conveyor are same ,we think it is advancing direction ,others
therwise ,we think it is the backward direction.
2. DETERMINATION OF TRAVELLING SPEED

In the course of blending stacker works we should make the stacked material volume on the travelling distance of the train equal when the blending stacker goes forward
and goes backward .In such situation the thickness of nearby layers of material stacked
on section of material pile can be nearly same ,we could get good blending result .That
means that the material volume stacked when the equipment goes forwards and the material
volume stacked when the equipment goes backwards is same.

Suppose: stacking material is q1 in a yield length of a material yard ,when the equipment
goes forward.
so Qh=Ar(V_{0}V_{1})/v_{1
}t/h
(4)
suppose : stacking material is q2 in a yield length of a material yard ,when the equipment
goes backwards .
so Qh=Ar(V_{0}+V_{2})/V_{2}
t/h (5)
Order Qq=Qh
So
Ar(VoV_{1})/V1=Ar(Vo+V_{2})/V_{2}
(6)
The relation between belt velocity of ground conveyor and the travelling velocity of train is : (VoV1)/V1=(Vo+V2)/V2 (7)
There are two characteristics about determination of travelling velocity according to (7):

1) Any two oneway travelling ,no matter it is going forward or going backwards, the material
stacked on the yard is the same when the travelling distance of the train is same.
2)Section of material pile of any oneway on stacking section .Please
Drawing 2.Suppose area is S, the thickness of material layer is h ,it
will be s1=s2=s3=s4...si ;
When stacking layer reaches a certain value ,hn0 to hn+1 
3.DETERMINATION OF BELT VELOCITY OF BOOM CONVEYOR
Suppose: the capacity of ground conveyor is Qt when blending stacking job is done ,the capacity
of boom conveyor of when stacking is Qb ,so when the train stop the capacity of stacking boom
conveyor is:
Qb=Qt=60ArV_{0}
t/h (9)
When the train forwards the capacity of the boom conveyor is:
Qb=Qq=60Ar(V_{0}V_{1})
(10)
When the train backwards the capacity of the boom conveyor is:
Qb=Qh=60Ar(V_{0}+V_{2})
(11)
Among them Q_{h}>Q_{t}>Q_{q
}(12)
So the belt velocity of stacking boom should be determined according to the capacity when the backwards . The conveyor capacity of stacking
Boom should be determined by following formula:
Qb=60A_{1}rV_{3 }t/h
(13)
In the formula ,A1  section area of the material on the stacking
Conveyor ,m^{2 }
V3  belt velocity of stacking conveyor ,m/min
If Q_{b}=Q_{h
}t/h (14)
So 60A_{1}rV_{3}=60Ar(V_{0}+V_{2})
A_{1}V_{3}=A(V_{0}+V_{2})
V_{3}=A/A_{1}(V_{0}+V_{2})
m/min (15)
If the Belt width of stacking boom conveyor and belt width of ground
Conveyor is same , and incling degree is nearly same ,under such condition ,
the belt of boom conveyor should be determined by following formula :
V3=V_{0}+V_{2 } m/min (16)
FROM <SINTERING AND PELLETIZING > ISSN10008764 19923
200135 By Li yimin INSUE
《屹立散料机械在线》《散料机械技术》