Ore Grinding Mill Air Swept Coal Mill
Ⅰ. Technical characteristics of air-swept coal mill
(1) The transmission forms used by the drum mill include edge
leaflet, center drive, multi-point meshing edge drive, etc.; the
drive forms include asynchronous motor + reducer + pinion + large
gear and synchronous motor + air clutch + pinion + large gear;
(2) Generally, the support method of static and dynamic pressure
bearings at both ends is adopted, and a fully enclosed
self-aligning 1200 line contact 'rocker type' bearing is used. Full
static pressure support;
(3) The large open gear is equipped with a sealed and reliable gear
cover, and is equipped with an automatic glycerin spray lubricating
device;
(4) The cylinder is the key part of the mill, and a computer is
used to carry out finite element analysis on it to ensure the
reliability of its use;
(5) The large and medium-sized mills are equipped with slow drive
devices;
(6) Large and medium-sized mills are equipped with high and low
pressure lubrication stations;
(7) The control and protection system adopts PLC control.
Ⅱ. Specification and meaning of air-swept coal mill
φ4×8+3.5m = inner diameter of cylinder×effective length of
cylinder+length of drying bin
Ⅲ. Development process of air-swept coal mill
From the past φ2.2m, φ2.8m, φ3m, φ3.2m, etc., to the present φ3.8m,
φ4m, etc. Equipment capacity from 500t/d, 700t/d, 1000t/d, 2500t/d,
5000t/d, 6000t/d.
Ⅳ. Working principle of air-swept coal mill
The raw coal is fed into the drying bin of the mill from the runner
of the feeding device, and the hot air with a temperature of about
350 ℃ also enters the mill through the air inlet pipe to dry the
raw coal, and the dried coal enters the grinding mill through the
partition board The silo is crushed under the impact and grinding
of the grinding body (steel ball). At the same time, the gas formed
by the special exhaust fan will bring the pulverized coal powder
out of the mill through the discharge device.
Ore grinding mill technical parameters
| Specifications (diameter × length) | Rotating speed
(r/min) | Feed size(mm) | Capacity(t/h) | Abrasive body loading
(t) | Main motor | Main decelerator | Weight
(t) |
| Model | Power(kw) | Rotating speed(r.p.m) | Model | Speed ratio |
| φ2.2×4.4 | 22.4 | ≤25 | 8～9t/h | 18t | YRKK4501-6 | 250 | 986 | ZD60-11 | 6.3 | 36.7 |
| φ2.2×5.8 | 22.4 | ≤25 | 5.5～7 | 23.5～25 | Y4005-8 | 280 | 750 | ZD70-10 | 5.6 | 45 |
| φ2.4×4.75 | 21.2 | ≤25 | 14 | 22～24 | YR4501-8 | 315 | 740 | ZD60-8 | 4.5 | 49 |
| φ2.4×4+2 | 20.2 | ≤25 | 10～11 | 19 | YRKK450-8 | 250 | 740 | ZDY355 | 4.5 | 60 |
| φ2.4×4.5+2 | 20.2 | ≤25 | 10～12 | 20.8 | YRKK500-8 | 280 | 740 | JDX45 | 4.5 | 68 |
| φ2.6×(5.25+2.25) | 19.7 | ≤25 | 9～10 | 28 | YRKK500-8 | 400 | 740 | ZDY450 | 4.5 | 87.4 |
| φ2.8×(5+3) | 18.7 | ≤25 | 13～13.5 | 32 | Y5001-8 | 500 | 740 | JDX560 | 4.5 | 102 |
| φ2.9×4.7 | 19.1 | ≤25 | 14～19 | 34.4 | YR560-8 | 500 | 743 | MBY560 | 5.6 | 79 |
| φ2.5×3.9 | 21 | ≤25 | 14 | 21 | JR138-8 | 280 | 740 | ZD70-9 | 5 | 49.5 |
| φ3×(6.5+2.5) | 18.3 | ≤25 | 17～19 | 43 | YRKK5603-8 | 630 | 740 | MBY560 | 5 | 120 |
| φ3.2×4.8 | 16.7 | ≤25 | 20 | 48 | YR630-8 | 630 | 740 | MBY560 | 5 | 118 |
| φ3.2×(6.5+2) | 16.9 | ≤25 | 20 | 50 | YRKK560-8 | 710 | 740 | JDX630 | 5 | 137 |
| φ3.5×8 | 17.2 | ≤25 | 55～60 | 80 | YRKK710-8 | 1000 | 740 | MBY800 | 6.3 | 182 |
| φ3.8×(7.75+3.5) | 16.7 | ≤25 | 85 | 85 | YRKK710-8 | 1400 | 740 | JDX90-WX-2A | 5.6 | 215 |
Ore grinding mill photo explanation
