The belt feeder is a belt conveyor that is subjected to high pressure and short length, and is also a relatively economical feeding device. There are three types of installation, as shown in Figure 1: a type is suitable for powder, the belt has a large pressure; b type is suitable for general materials, and a regulating gate valve can be set between the bucket and the feeder; c type It is suitable for non-adhesive medium-sized materials. The gate valve is generally installed between the bucket and the feeder. The feeder has no pressure on the surface of the mine.
The belt feeder has a belt speed of generally less than 0.3 m/s. If there is no gate valve on the feeder to control the discharge volume of the mine bin, the belt speed of the feeder can be increased to 1 m/s. When the material size exceeds 350 mm, it is best not to use a belt feeder.
The belt feeder has no series of products and is generally designed by the user. Its structure is shown in Figure 2.
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(1) Calculation of the production volume of belt feeder Q t =3600K 1 bhγV (1)
Where Q t ———production quantity, t/h;
K 1 ———The utilization factor of the trough body, generally taking K 1 =0.75~0.85;
b———the distance between the two panels, generally greater than 2.5 times the maximum particle size of the material, m;
h———the height of the fence, m;
Γ—the loose density of the material, t/m 3 ;
υ———speed, m/s.
(two) motor power calculation
Where M———motor power, KW;
K 2 ———Safety factor K 2 =1.1～1.15;
η———transmission efficiency, η=0.94～0.97;
P Q ———load consumption power, kW;
P K ———the consumption power of the fence, kW;
P p ———Compressed power consumption, kW.
(1) Calculation of P Q :
Where h———layer thickness, m;
l———the length of the fence, m;
Γ—the loose density of the material, t/m 3 ;
υ———speed, m/s;
ƒ ———The coefficient of friction between the material and the slab, ƒ =0.4~0.7;
δ———The effective internal friction angle of the material, (°).[next]
(3) Calculation of P P :
Where μ———the coefficient of friction, μ=0.4-0.45;
σ 1 ———column pressure, Pa;
b———the width of the discharge opening of the silo, m;
D———the diameter of the discharge port of the silo, m;
Lo———the length of the discharge opening of the silo, m;
Γ—the loose density of the material, t/m 3 ;
g———gravitational acceleration, g=9.81m/s 2 ;
ƒ ƒ ———flow factor;
π———piule ratio;
K 3 ———The pressure coefficient of the silo loading. If the filling of the warehouse is often in operation, take K 3 =2~4; if the storage height of the silo is not less than 3m, take K 3 =1.2.
(3) Calculation of the maximum tension of the conveyor belt
Where i———the number of layers of conveyor belt core canvas, layer;
K 5 ———Safety factor, generally taking K 5 =12;
B——-bandwidth, m;
σ p ———the radial strength of the canvas core, N/(m · layer).
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