PRODUCT DETAILS

Jiangsu Xinye Heavy Industry Co., Ltd. specializes in manufacturing various XYLM and XYPRM vertical mills.

The vertical mill developed based on advanced foreign technology can achieve the corresponding fineness by rolling the material (0-44mm) on the rotating disc with pressure grinding rollers. It has the advantages of high grinding efficiency, large drying capacity, easy adjustment of product fineness, low noise, low power consumption, simple process flow, low wear, and low operating costs.

Under the same process conditions, with the same rotational speed, disc diameter, material layer, and roller pressure, the PRM type vertical grinding efficiency can be improved by more than 30%, with an average energy saving of 8.2%, and the overall impact vibration of the machine can be significantly reduced. This product has reached the international advanced level in technology and the manufacturing quality has reached the domestic leading level. It has passed the ministerial level appraisal and was listed as a national new product in 1995.
Working principle of vertical grinder

Main structure and function:

The main structure of a vertical mill consists of a separator, grinding roller device, grinding disc device, pressure device, reducer, motor, housing, and other parts.

The separator is an important component that determines the fineness of the ground powder product. It consists of a variable speed transmission device, rotor, guide vanes, shell, coarse powder hopper, air outlet, etc. It is an efficient, energy-saving, and fast powder selection device.


Grinding roller is the main component for crushing and grinding materials. It is mounted on the bending arm of the grinder, and under the action of external force, it is tightly pressed against the material on the grinding disc. With the drive of the grinding disc, the grinding roller rotates accordingly, thereby crushing and crushing the material.

The grinding disc is fixed on the output shaft of the reducer, and the upper part of the grinding disc is a material bed with an annular groove. The material is crushed by the grinding roller in the annular groove.

The pressure device is a component that provides grinding pressure for the grinding roller. It consists of a high-pressure oil station, a hydraulic cylinder rod, an accumulator, etc., and can apply sufficient pressure to the grinding roller to crush the material.

The reducer is the main component for transmitting power, and the speed of the grinding disc is the speed of the output shaft of the reducer.

working principle

The electric motor drives the grinding disc to rotate through the reducer, while hot air enters the vertical mill from the air inlet. The material falls into the center of the grinding disc from the discharge port. Due to centrifugal force, the material moves from the center of the grinding disc to the edge of the grinding disc. When passing through the annular groove on the grinding disc, it is crushed by the grinding roller and continues to move towards the edge of the grinding disc until it is carried away by the airflow at the wind ring, while large particles of material fall onto the grinding disc and continue to be crushed. When the material in the airflow passes through the upper separator, the coarse material falls from the conical hopper onto the grinding disc under the action of the guide vanes, and the fine powder is ground together with the airflow and collected by the system's dust collector. The collected powder is the product of the vertical grinding. The material is dried in contact with the gas in the shell to achieve the required dry humidity for the product. By adjusting the angle of the guide vanes of the separator (which cannot be adjusted by small vertical mills) and the speed of the separator rotor, the required thickness of the product can be achieved.

Compared with ball mills, vertical mills have the following advantages:

1. The grinding efficiency is high, and the vertical mill uses grinding rollers and a material bed to crush and grind materials, with low energy consumption. The power consumption of the grinding system is reduced by 20-30% compared to the ball milling system, and the energy-saving effect is more significant as the humidity of the raw materials increases.

2. Strong drying ability, the vertical mill adopts gas conveying material. When grinding materials with high moisture content, the inlet air temperature can be controlled to achieve the final moisture content of the product. Materials with moisture content up to 12-15% can be dried in the vertical mill. Even for drying ball milling, only materials with moisture content of 3-4% can be dried.

3. The particle size of the material to be ground is large, reaching about 5% of the diameter of the grinding roller, usually 40-100 millimeters. Therefore, large and medium-sized vertical mills can avoid secondary crushing.

4. The product has stable chemical composition and uniform particle size distribution. Due to the fact that the material only stays in the vertical mill for 2-3 minutes, while ball milling takes 15-20 minutes, when using vertical grinding powder, the chemical composition of the product can be quickly determined and corrected, with minimal fluctuations in the product's chemical composition, which is beneficial for homogenization. In addition, qualified products in the vertical mill can be separated in a timely manner, avoiding repeated grinding. The particle size of the products is uniform and consistent, which is conducive to calcination.

5. The process flow is simple, the building area is small, and the space occupation is small. There is a separator inside the vertical mill, and there is no need to equip it with a powder selection machine and a lifting machine. The dust containing gas from the mill can be directly collected into the dust collector as a product. Therefore, the process is simple, the layout is compact, and the building area is only 70% of the ball milling system, with a building space of about 50-60% of the ball milling system.

6. Low noise, minimal dust, clean operating environment. The vertical mill operates without direct contact between the grinding roller and the grinding disc, and there is no sound of steel balls colliding with each other or hitting the lining plate during ball milling. Therefore, the noise is low, about 20-25 decibels lower than ball milling. In addition, the vertical mill is sealed as a whole, and the system works under negative pressure, so there is less dust. Clean environment and meet environmental requirements.

7. The metal loss is small, the lining plate and grinding roller have a long service life, and the utilization rate is high. Due to the lack of direct contact and collision between metals in the operation of the vertical mill, the wear of accessories is low and the service life is long. The metal loss per unit product is generally 5-10 grams/ton. For medium hardness cement materials, the service life of the grinding roller and lining plate can reach about 8000 hours.