What is a MTW grinding mill?

MTW grinding mill, full name MTW European version grinding mill, is a new type of grinding equipment developed by absorbing advanced European grinding technology and concepts. It is the latest grinding mill designed by SMAT Machinery production experts based on long-term grinding mill research and development experience and according to the use and suggestions of many grinding mill users. It has a number of independent patent technology property rights.

MTW grinding mill adopts a number of patented technologies such as bevel gear integral transmission, internal thin oil lubrication system, arc air duct, etc. It has high grinding efficiency and large output. It is an ideal replacement product for traditional raymond mill and pendulum mill.

MTW European grinding mill specification

MTW grinding mill product features

High efficiency and energy saving:

MTW grinding mill adopts bevel gear integral transmission, which has stable transmission and greatly reduced energy loss. Equipped with thin oil lubrication system to reduce lubrication resistance and energy consumption. Curved air duct design reduces system energy consumption.

Good environmental performance:

MTW European version grinding mill is equipped with pulse dust collector, and dust emission meets national environmental protection standards. The air self-circulation system and dust collector work together to meet environmental protection requirements.

Low maintenance cost:

The three major transmission parts of the main engine, fan and powder selector are all lubricated with thin oil, without the need for additional oil pumps or lubrication stations. The lubrication system adopts a water cooling device to significantly increase the service life of the main bearing system.

Adjustable finished product fineness:

MTW grinding mill adopts a new type of hanging cage powder selector, frequency conversion control, and adjustable and controllable fineness. It can meet the requirements of various specifications and particle sizes.

Compact structure and small footprint:

MTW grinding mill equipment has a compact structure and strong completeness, can be arranged outdoors, and reduces civil engineering costs

MTW grinding mill Applicable materials

MTW grinding mill is suitable for a variety of materials with Mohs hardness below 7 and water content less than 6%. It is suitable for grinding and processing of mineral products such as metallurgy, building materials, chemicals, and mining.

MTW grinding mill structural features

1. Pre-crushing PE250×400 2. Jaw crusher motor 3. Elevator TH250 4. Hopper 5. Main engine motor 6. Powder selection motor 7. Feeder GZ3F 8. Main engine 9. Powder selection machine 10. Main engine inspection door 11. Cyclone dust collector 12. Dust collector 13. Fan 14. Fan motor 15. Electric control cabinet

Bevel gear integral transmission

Traditional grinding mills require a reducer and a main shaft through a coupling. It is difficult to align the center during installation, which is easy to generate noise and reduce efficiency. The MTW series European trapezoidal grinding mills are bevel gear integral transmission, with a more compact structure, more convenient and quicker installation and adjustment, and greatly increased efficiency.

Internal thin oil lubrication system

Traditional grinding mills are lubricated in the form of grease lubrication, which has large lubrication resistance, high temperature rise, and short bearing life. The MTW series European trapezoidal grinding mills use internal oil pumps, which can achieve lubrication of the main shaft bearings and bevel gear shaft bearings without adding additional oil pumps or lubrication stations.

Arc-shaped air ducts

The grinding mill air ducts in traditional grinding mills are all straight-plate air ducts. This structure has the disadvantages of airflow impacting the air duct plate to generate resistance, large energy loss of collision between airflow molecules, and easy generation of eddy currents, which leads to air duct blockage. The air ducts used in the MTW series European trapezoidal grinding mills are curved air ducts, with smooth tangential airflow inlets and small resistance. The internal outlet direction is conducive to the dispersion of materials and is not easy to block materials.

Curved surface replaceable blade scraper

The blade of the traditional grinding machine scraper wears quickly. The scraper is an integral scraper. After the blade is worn, the scraper needs to be replaced as a whole, which wastes materials and increases downtime for replacement.
MTW series European trapezoidal grinding scrapers use highly wear-resistant alloy materials for the blade, which has a long service life. When replacing, only the blade part needs to be replaced, which improves material utilization.
In addition, the traditional flat scraper, after the material is scooped up, it accumulates on one level, causing serious wear in the middle of the grinding roller and grinding ring. The curved scraper can guide the material to the vertical surface,
so that the upper, middle and lower parts of the grinding roller and grinding ring can be ground, so that they are evenly worn, and at the same time, the effective working area is increased, thereby increasing production.

Isolated cyclone powder collector

The isolation structure between the inner cylinder and the mixed gas powder flow can effectively improve the powder selection efficiency and powder selection accuracy.
Resistance-free air inlet volute (small observation door without eddy current): The inner surface of the inner door panel of the air inlet volute observation door of the traditional mill protrudes outwards and is not on the same plane as the inner surface of the air inlet volute, which is easy to produce eddy current effect and increase system energy consumption.

The MTW series European trapezoidal mill adopts the inner surface of the inner door panel and the inner surface of the air inlet volute on the same curved surface, which can effectively avoid the eddy current effect.

How does a MTW grinding mill work?

The working principle of MTW grinding mill (European version grinding mill) mainly includes the following steps:

1. Material pretreatment:

Large bulk materials are first crushed to the required particle size by jaw crusher or hammer crusher, and then sent to the storage hopper by elevator.

2. Uniform feeding:

The materials in the storage hopper are uniformly and quantitatively fed into the main grinding chamber by electromagnetic vibrating feeder or variable frequency belt feeder.

3. Grinding process:

After the material enters the grinding chamber, the grinding roller is pressed tightly on the grinding ring under the action of centrifugal force. As the grinding roller rotates, the material is crushed by the strong grinding pressure between the grinding roller and the grinding ring. MTW grinding mill adopts bevel gear integral transmission, stable transmission and low energy loss.

4. Classification and screening:

The ground material is sent to the powder selector by the fan airflow for classification. Under the action of the impeller of the powder selector, materials that do not meet the fineness requirements will fall into the grinding chamber for re-grinding, while materials that meet the fineness requirements will enter the cyclone powder collector with the air flow through the pipeline.

5. Finished product collection:

Qualified materials are separated and collected in the cyclone powder collector, and the finished powder is discharged through the discharging device.

6. Air flow circulation:

The separated air flow enters the fan through the return air duct at the upper end of the cyclone powder collector. The system belongs to a closed-loop circulation system and operates under positive and negative pressure conditions. Since the material being ground in the grinding chamber contains a certain amount of moisture, the heat generated during grinding will cause the gas in the grinding chamber to evaporate and expand, changing the air flow of the system. The excess gas is introduced into the bag dust collector through the exhaust pipe valve set at the air outlet of the fan, and discharged after purification, realizing environmentally friendly production.