The structure of the trough feeder is relatively simple, as shown in the figure below. It can be installed either on the ground or at the discharge opening of the silo. The bottom of the trough feeder is 20 to 60 times per minute and the stroke is 20 to 200 mm. The stroke can be properly adjusted by the eccentric of the drive, with the eccentricity being half of the stroke. According to certain beneficiation plant practice, when dealing with viscous ore, eccentricity is preferably not less than 50 mm. The width of the trough feeder tank is about 2 to 2.5 times the maximum feed size. The trough feeder has been used to meet the ore feeding of granular ore below 500 mm, but the most commonly used one is 9180×1240 mm, and its ore feeding size is 350～0 mm, which is broken as 400×600 颚. machine feeding equipment is suitable.
(1) Calculation of the production volume of the trough feeder
Q t =120K 1 B hn Rγ (1)
Where Q t ———production quantity, t/h;
K 1 ——— full coefficient, K 1 =0.8;
B———slot width, m;
h———layer thickness, m;
n———rushing times, times/min;
R———eccentric distance, m;
γ———the bulk density of the material, t/m 3 .[next]
(2) Power calculation of trough feeder
(1) Material gravity in the tank:
Fg=1000B h LYg (2)
Where F g ——— material gravity, N;
B———the width of the trough, m;
h———layer height, m;
L———the length of the trough, m;
Γ—the loose density of the material, t/m 3 ;
g———gravitational acceleration, g=9.81m/s 2 ;
(2) Column gravity:
F p =σ 1 b l (3)
Where F p ———grain gravity, N;
b———the width of the discharge opening or the connection funnel of the silo, m;
l———The length of the discharge port of the silo or the length of the connecting funnel, m;
σ 1 ———Guo Gui pressure;
(3) When the bottom plate retreats, the friction between the material and the bottom plate:
F= Æ’ (F g +F p ) (4)
Where F———friction, N;
ƒ ———The friction coefficient of the bottom plate and the material ƒ =0.4～0.7.
(4) Maximum speed of the bottom plate:
Where M———motor power, kW;
F———friction, N;
υ———Maximum speed of the bottom plate, m/s;
K 2 ——— the resistance coefficient of the bottom plate, the supporting wheel, the eccentric wheel, etc.;
η——— Transmission efficiency.
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