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1.ISO9001:2008, 2.professional manufacture with 50years, 3.durable liner,whole life service,discharging evenly, 4.customized - details see: https://www.machineto.com/mqy-2740-energy-saving-overflow-ball-mill-with-ce-bv-by-zhongde-10313935

What Are These Machines and How Do They Work?

A Ball Mill grinds material by rotating a cylinder with steel grinding balls, causing the balls to fall back into the cylinder and onto the material to be ground. The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. The larger the diameter, the slower the rotation. If the peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill.

The point where the mill becomes a centrifuge is called the "Critical Speed", and ball mills usually operate at 65% to 75% of the critical speed.

Ball Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recalculated back into the mill to be reduced. Various classifiers, such as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mills.

This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

Application:

Ball mill is the key equipment for grinding after the crush process, and it is widely used in the manufacture industries, such as cement, silicate, new building material, refractory material, fertilizer, ferrous metal, nonferrous metal and glass ceramics.

It also can be used for the dry and wet grinding for all kinds of ores and other grind-able materials.

Types:

Mill could be sorted as following:

As per the grinding media: ball mill, rod mill and AG Mill (without grinding media).

As per material discharging mode: wet grid mill, dry grid mill & overflow mill.

As per driving mode: side & central driving. The former is more popular now.

As per driving configuration:

a. Asynchronous motor driving: Asynchronous motor + Reducer + Pinion +Girth gear

b. Synchronous motor driving: Synchronous motor+ Air clutch+ Pinion +Girth gear

c. Asynchronous motor + reducer + diaphragm coupling

Structure of Ball mill:

The machine is composed of feeding part, discharging part, turning part and driving part (reducer, small driving gear, electric motor and electric control).

The quill shaft adopts cast steel part and the liner is detachable. The turning gearwheel adopts casting hobbing process and the drum is equipped with wear-resistant liner, which has good wear-resistance.

Technical Parameters

Model	Diameter of cylinder(mm)	Length of cylinder(mm)	Effective volume(m3)	Max.ball loading(t)	Speed(r/min)	Capacity(t/h)	Discharging size(mm)	Main motor(kw)
MQY-1530	1500	3000	4.5	8	30	6.3-2.8	0.3-0.074	90
MQY-1845	1830	4500	10.5	19	26.8	15.5-6	0.3-0.074	180
MQY-2130	2100	3000	9.2	16	23.8	18-5.8	0.3-0.074	210
MQY-2145	2100	4500	13.8	25	23.8	25-8	0.3-0.074	280
MQY-2245	2200	4500	15.2	28	21.3	26.8-8.5	0.3-0.074	280
MQY-2436	2400	3600	14	26	21.3	33.5-8.8	0.3-0.074	280
MQY-2460	2400	6000	24	44	21.7	56-14.5	0.3-0.074	480
MQY-2736	2700	3600	18	33	20.7	54-11.7	0.3-0.074	400
MQY-2760	2700	6000	31	57	20.6	90-19.5	0.3-0.074	630
MQY-3040	3000	4000	25.7	47	19	78-16.5	0.3-0.074	500
MQY-3254	3200	5400	38	73	18.2	114-25.9	0.3-0.074	800
MQY-3270	3200	7000	50.6	93	18.2	148-30.2	0.3-0.074	1250
MQY-3645	3600	4500	40.8	75	18	136-24.3	0.3-0.074	1000
MQY-3685	3600	8500	79	131	18	256-45.8	0.3-0.074	1800
MQY-4060	4000	6000	70	126	16.9	226-40.5	0.3-0.074	1500
MQY-4361	4270	6100	80	144	15.7	258-46	0.3-0.074	1850
MQY-4564	4500	6400	95	172	15.6	306-54	0.3-0.074	2000
MQY-5064	5000	6400	120	216	14.4	386-68	0.3-0.074	2600
MQY-5585	5500	8500	187	338	13.8	615-108	0.3-0.074	4500

pictures for reference:

Manufacture process of grinding machine and high-efficiency overflow ball mill:

Ball Mill Delivery Pictures:Working Site Pictures:

Certifications and Honors:

ISO:9001:2008

BV Certification:

For more crushing machine and grinding equipments, please view our website: www.miningballmill.com