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ƒ——The coefficient of friction between the material and the disc is determined by experimental and actual measurement data;
Feeding and discharging equipment selection and calculation
First, the belt feeder
This type of feeder is used for bulk ore feeding, and a densely arranged upper flat roller belt conveyor with special cushioning measures is adopted. The bearing pressure is relatively large, the length is short, and the belt speed should be below 0.3m/s. When there is controllable ore discharge on the feeder, the belt speed can be increased to 1m/s, and the material size should be below 350mm. Non-shaped equipment, designers can design according to local conditions, it is more economical. If used in small ore feeds, such as ball mills , it can be used with a shorter ordinary belt conveyor. The rollers are not encrypted, but cannot withstand large pressures. The calculation of the ore amount is carried out according to formula (1).
q=3600KrδÏÏ… (1)
Where q is the amount of ore, t/h;
Δ——layer thickness, m;
K——section fullness coefficient, generally taking K=0.75~0.85;
R——the spacing of the barrier plates, generally greater than 2.5 times the maximum particle size of the material, m;
Ρ——loose density of material, t/m 3 ;
Υ——speed, m/s.
Second, the plate feeder
Beneficiation plant common plate feeder has two kinds of heavy and medium, usually mounted on the bottom bin ore, crushing the ore to the crusher, the ore uniform, reliable, can be directly subjected to the pressure of pillars, but the weight, cost high. The maximum weight of the heavy feed can reach 1300mm, the medium maximum feed size does not exceed 350mm, and the formula for calculating the ore supply of the chain feeder is the same as that of formula (1). Only the formula parameters are slightly different, and the section full of coefficient K is generally taken. 0.8; the width of the discharge bin of the mine bin is b, which is generally 0.9 times the bandwidth of the chain plate. The rest of the symbols have the same meaning as formula (1).
Third, trough feeder
The trough feeder can be erected on the ground or hoisted below the unloading port of the mine bin. The trough bottom is reciprocated. The stroke n is 20~60 times/min and the stroke is 20~200mm. The stroke can be appropriately adjusted by the drive eccentric, with the eccentricity being half of the stroke. According to production practice, for viscous ore, the eccentricity should not be less than 30mm. The trough feeder has a width of 2 to 2.5 times the maximum particle size of the feed, and is suitable for medium-grained materials up to 450 mm. The calculation of the ore amount is carried out according to formula (2).
q=120KbhndÏ (2)
Where q is the amount of ore, t/h;
B——slot width, m;
K——section fullness coefficient, K=0.8;
D——eccentric distance, m;
N——rushing times, times/min;
δ, Ï - the same as before.
Four, pendulum feeder
The pendulum feeder is mostly used as a feeder for the ball conveyor of the ball mill, and the eccentricity of the eccentric wheel is adjusted to adjust the amount of ore. The machine is suitable for small materials, simple in construction and cheap in price, but the feeding is not uniform. Its ore amount is calculated according to formula (3).
q=60bhLÏnK (3)
Where q is the amount of ore, t/h;
H——the height between the valve fan and the valve body, m;
B——the width of the discharge port, m;
L——the swinging stroke of the feeder, m;
N——the number of eccentric turns, r/min;
Ρ——åŒå‰;
K——section fullness factor, generally K=0.3~0.4.[next]
Five, disc feeder
The disc feeder is suitable for powder ore feeders below 20mm, and has certain adaptability to viscous materials (such as wet concentrates and water-containing fine-grain materials). The feeding material is uniform, easy to adjust and convenient to manage. The diameter of the feeding port is generally 0.5~0.6 times of the diameter of the disc, but the structure is more complicated, the price is higher, and the equipment height is larger. The sleeve and chassis structure of the disc feeder is schematically shown in Figure 1.
Where q is the amount of ore, t/h;
D 1 - sleeve diameter, m;
H——the height of the sleeve from the chassis, m;
A——the angle of repose of the material, (°);
N——the number of revolutions of the disk, r/min,
R 1 - the radius of the frustoconical bottom formed by the material, m;
Ï, g - the meaning of the symbol is the same as before.
Closed q=60Ï€n(R 2 1 -r 2 ) (5)
Where h is the opening height of the discharge opening, m;
R 1 - disc radius, m;
R——the distance between the inner side of the discharge opening and the center of the disc, m;
n, Ï, q - the meaning of the symbol is the same as before.
Sixth, electromagnetic vibration feeder
The electromagnetic vibration feeder has simple structure, convenient operation, no rotating parts, no lubrication, uniform feeding, easy adjustment of ore content, and is mostly used for loose materials with a particle size of 0.6~500mm. The device has small amplitude and high frequency, but it is easy for the viscous wet material to make the bottom of the tank and destroy the basic working parameters. In this case, it should not be used. The amount of ore supplied by the electric vibrating feeder is calculated according to formula (6).
q=3600bhÏ…ÏK (6)
Where q is the amount of ore, t/h;
B——slot width, m;
H——the height of the material layer in the tank, m;
K——section fullness coefficient, 0.6~0.9; the particle size takes a large value, and when the particle size is large, it takes a small value;
Υ—— conveying speed, m/s;
K T - the period coefficient, usually taken as 1.0;
Ƒ——frequency, Hertz, isolated from the product performance table;
β - the angle of inclination, usually 20 °;
Ï, g - the same as before;
Ï„ - the throwing coefficient is the ratio of the throwing time to a vibration period.