LIWEI Grinding Production Line

VTM Vertical superfine grinding production line is a new machine by absorbing the foreign technology and design. It is used to m

1.Product Description:

VTM Vertical superfine grinding  production line is a new machine by absorbing the foreign technology and design. It is used to mill the material on rotating disc to the fineness of 325~3000 meshes by grinding. The main technique is mainly shown on the full contact of grind roller, mill disc with material and classifying accuracy of classifying system. It is mainly used in the fields of metallurgy, power station, chemical industry, cement, and refractory. It is especially used to grind the nonmetallic ore into superfine powder.

Vertical Superfine  production line integrates the functions of milling, classifying and drying. Compared with ball mill, Raymond mill and other grinding equipment, vertical superfine mill has the advantages of high efficiency, energy-saving, good grinding effect, good drying capacity, easy coarse and fine adjustment, even grain size, easily controlled chemical composition, low noise, less dust, less metal abrasion, easy operation, convenient replacement of wearing parts, easy system process, less covering area, good comprehensive benefits, and so on. Thus, vertical superfine mill draws great attentions from powder processing industry and is widely used to grind calcite, electrolytic stone, talc, kaolin, manganese ore, rock phosphate, gypsum, zircon, silicon metal, etc.

2.Working Principle:

The motor drives the mill disc to rotate through speed reducer and drive the grind roller rotate through belt gear at the same time. The material falls on the center part of mill disc from the feed port and simultaneously the hot air enter the mill. Under the action of centrifugal force, the material moves to the mill edge, and is to be grinded by rolling and shearing when passing through the ring groove on the mill disc. The grinded material is blown up by high speed air from wind loop at the edge of mill disc. The large grains fall onto the mill disc and are grinded again. The material in the air stream passes through the classifier. The rotator makes the coarse grain fall onto the mill disc to be grinded again and the qualified fine grain come out of mill. And then the finished fine materials are collected in the powder collecting system. The fine materials with water content are dried by hot air and then achieve the required product moisture. The air is recycled and reused. During the circulation, the small surplus air is collected by the by-pass dust collector in this system with the lighter impurities, which forms a scientific and advanced process.

3.Features:

1. Low running cost: The milling efficiency is high and the power consumption is low. Compared with ball mill, Raymond mill and other milling machine, the power consumption of vertical superfine mill decreases 40~50%. The abrasion is low, roll sleeve and liner has long service life by adopting special materials, which reduce the metallic pollution and running cost. External circulation device can be equipped to reduce power consumption further and improve product accuracy.

2. Low project implementation: Compared with ball mill, vertical superfine mill covers 50% less area and project implementation decreases by 70%. Vertical superfine mill integrates crushing, drying, milling, classifying and conveying, which makes the system simple and the project implementation low.

3. Easy and reliable operation: Vertical superfine grinder is equipped with automatic control equipment, which can realize remote control. There is also a device with can prevent grind roller from contacting with liner directly and can avoid destructive vibration.

4. Convenient maintenance repair: Slide the frame during the maintenance on hydro-cylinder, which can replace roller sleeve and wear ring in a short time. The material of wear ring is 50SiMn.

5. Less environmental pollution: There is low vibration and low noise for vertical milling machine. The whole system is under negative pressure, which avoids dust overflowing.

6. Reliable quality: The material stays less time in the mill, which can easily test and control product size and chemical composition. This mill is equipped with high accuracy analyzer, which can classify the products from 325 meshes to 3000 meshes. The classifying accuracy is high, the cutting position is accurate and the product quality is reliable.

4.Specification and technical parameter of VTM411 Vertical superfine grinding  production line

Specification Mesh	Capacity (t/h)	Feed size (mm)	Moisture (%)	Size distribution d97 (μm)	Average size d50 (μm)	Power (kw)
400 Mesh	8.5~10	0~15	<10	35	8.1	310
600 Mesh	7.5~9	0~15	<10	23	5.2	310
800 Mesh	6.5~8	0~15	<10	19	4	310
1000 Mesh	4.5~5	0~15	<10	15	3	310
1250 Mesh	3.5~4	0~15	<10	12	2.4	310
1500 Mesh	2.5	0~15	<10	10	1.8	310
2000 Mesh	2~2.5	0~15	<10	7.5	1.3	310

5.Power allocation for VTM411 Vertical superfine grinding  production line

Part	Duster	Analyzer	Blower	Main machine	Grinding head	Feeder	Discharger	Crusher	Lifter
Power(kw)	7.5	45	110	75	4x15=60	4	3	11	3

6.Layout and Process

The double drives of grind roll and grind ring, the adjustable speed on grind roll, and the two forces of rolling and shearing on the materials can improve the fineness and capacity.

7.Cylinder Action

Cylinder Working under Pressure

The oil in the lower cavity of cylinder returns back. Then, it is separated from the grind disc and the grind mill rises upwards. Vertical superfine mill can be started with light load. Under such circumstances, the overhaul and maintenance are much more convenient.

Cylinder under Pressure Relief

During the operation process, the lower cavity of cylinder is filled with oil until it reaches the required pressure, which is imposed on the materials on grind disc through grind roll. Then, the materials are grinded. The accumulator absorbs the impact and vibration during the grinding process, which can protect speed reducer and electric motor.

8.Parameters for Inner Structure of VTM411 Vertical superfine grinding  production line

Structure	Grind Disc	Grind Ring 50SiMn	Grind Roll (4pcs) 50SiMn	Analyzer	Cylinder Pressure	Dust Collector
Parameter	φ1200×170	φ1100×170	φ350×150	φ900×850	10MPa	Pulse bag type dust collector

LIWEI Grinding Production Line