LM Series Vertical Roller Mill Overview

As an ideal equipment in the grinding industry engaged in crushing, drying, grinding, separating and transportation, the LM series vertical roller mills are advanced grinding equipment designed and developed by our company based on our years’ experience in mill production as well as wide range of adoption of domestic and overseas advanced technology.

LM Series Vertical Roller Mill Application

LM series vertical roller mills can be widely used in cement, electric power, metallurgy, chemical industry, non-metallic mining and other industries to grind blocky, granular and powdery raw materials into powder as required.

Technical Advantages

Small Comprehensive Investment

The equipment integrates the functions of crushing, drying, grinding, powder separating and transportation, featuring simple system and compact layout, with the floor space of about 50% of that of the ball-milling system. And it can be arranged outdoors so as to greatly reduce the investment costs.

The system design is simple and reasonable, saving unnecessary equipment investment so as to reduce total investment of the equipment.

Low Operating Costs

  • Less wear: The roller does not contact the grinding plate directly and the roller and grinding plate are made of high-quality materials. Therefore, they enjoy longer service life and less wear.
  • High efficiency: The grinding rollers can directly grind materials on the grinding plate, featuring lower energy consumption (30% ~ 40% lower than that of ball-milling systems).
  • Strong drying power: The hot air can directly contact materials in the mill. By adjusting the hot air temperature, it can satisfy the grinding demands of materials of different moisture content.
  • Stable performance: A limiting device is provided to prevent direct contact between the roller sleeve and the lining plate of the grinding plate, so that destructive impacts and violent vibration could be avoided to lower the failure rate.
  • Simple maintenance: The roller sleeve and grinding plate can be easily replaced by means of the service cylinder, so that downtime losses could be significantly reduced.

Automatic Control System

The equipment is provided with an expert automatic control system, realizing free switching between remote and local control to achieve easy operation and save labor costs.

High-quality Finished Products

The materials only stay in the mill for a short time, which can reduce repeated grinding, and facilitate testing and controlling the product particle size and chemical composition as well as stabilizing the product quality.

The grinding roller does not directly contact the grinding plate, so the product contains very little iron and the iron contents due to mechanical wear can be easily removed, so that the whiteness and purity of the product can be effectively guaranteed.

An efficient dynamic and static combined powder classifier is adopted with the rotor speed adjustable, so that higher classification efficiency and top-quality finished products could be ensured to satisfy different requirements for fineness.

High Environmental Protection Standard

The equipment can operate stably with little vibration, so its noise is fairly low. The system is wholly sealed and works under negative pressure, free of dust spillover and environmentally friendly, with the emission meeting the national standard.

LM Series Vertical Roller Mill Working Principle

The main motor drives the grinding plate by the reducer, simultaneously the hot air enters the vertical mill body from the air inlet and the materials drop on the grinding plate center from the feed opening and evenly move outwards due to centrifugal force. The materials are ground by grinding rollers when passing through the grinding area on the grinding plate, and large size materials will be directly crushed while the fine materials will form a material bed by extrusion for further inter granular crushing. The crushed materials will continue to move towards the mill edge until being taken away by the strong air flow at the vane and collected by the dust collector, while larger material particles will again fall onto the grinding plate for repeated grinding; the coarse particles in the air flow will drop back onto the grinding plate for further grinding when passing through the upper separator under the action of the rotor blade, with the qualified fine powder flowing out of the grinding plate with the air flow and then collected and discharged by the system powder collector as finished powder product. However, the iron blocks and other wastes mixed in the materials will move along with the materials towards the edge of the grinding plate due to their own weight and fall into the lower chamber and then be discharged out of the slag discharge opening by the scraping plate at the bottom of the mill tray (commonly known as scumming).

LM Series Vertical Roller Mill Main Specification

LM Series Vertical Roller Mill Main Specification

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