What Are The Commonly Used Accessories in A Grinding Mill?

The mill is a key equipment in industries such as mining, cement, power, and metallurgy, mainly used for grinding materials into powder. Its large-sized components are diverse and highly valuable, and constitute a major part of maintenance and equipment costs.

Grinding the core components

1.Liner Plates

• Function: Protect the mill cylinder from direct impact and wear caused by grinding media and materials; at the same time, improve the grinding efficiency by influencing the grinding media (steel balls/steel forgings).

• Type:

  Cylinder liner: Installed on the inner wall of the grinding mill cylinder, with various shapes (such as wave-shaped, stepped-shaped, and groove-shaped), selected according to different stages of the mill (coarse grinding and fine grinding).

  End liner: Installed on the covers at both ends of the mill, it protects the covers.

• Material: High manganese steel, high chromium cast iron, alloy steel, etc. It is required to have extremely high wear resistance and toughness.

2.Grinding Media

• Function: It is an object that directly impacts and grinds the materials.

• Type:

  Steel balls (Balls): Used in ball mills, with different sizes and specifications.

  Steel rods (Rods): Used in rod mills, they are in the shape of long cylinders.

  Ceramic balls: Used in industries where iron contamination needs to be avoided (such as ceramics and chemical industries).

• Material: Usually high-chromium alloy cast iron or forged steel is used, with the requirement of high hardness, high wear resistance and impact resistance.

Power and transmission components

1.Small gear (Pinion Gear)

Function: Installed on the output shaft of the reducer, it is an active gear that drives the large gear ring.

2.Large gear ring (Girth Gear)

• Function: A huge circular gear is fixed on the cylinder of the mill. The small gear drives the large gear ring, thereby causing the entire mill cylinder to rotate. This is one of the largest and heaviest individual components in the transmission system.

3.Main Motor

• Function: It provides the substantial power required for the operation of the mill, with the power ranging from several hundred kilowatts to several thousand kilowatts.

4.Reducer (Gearbox)

• Function: To reduce the high rotational speed of the motor and increase the torque, so as to drive the small gear at the rotational speed suitable for the operation of the mill. Its size and weight are both very large.

5.Clutch

• Function: Connects the motor shaft with the input shaft of the reducer, transmits torque and compensates for a certain amount of alignment error.

Supporting and rotating components

1.Hollow shaft / Main bearing

• Function:

  Hollow shaft: It refers to the hollow shaft neck at the feed end and discharge end of the mill. It serves as both the passage for materials and the supporting shaft for the rotating part of the mill.

  Main bearing: A huge sliding bearing or rolling bearing that bears the total weight of the entire mill cylinder, liners, medium and materials, allowing it to rotate at low speed and under heavy load.

2.Bearing Housing

• Function: Install the main bearing and fix it on the foundation of the mill.

Other important major components / assemblies

1.End cover (Heads / End Walls)

• Function: The end covers of the mill cylinder are usually cast or welded together with the hollow shaft, and the structural strength requirements are extremely high.

2.Cylinder (Shell)

• Function: The main body of the mill is a huge cylindrical structure made by rolling and welding steel plates, with liner plates installed inside. It is also a large-scale steel structure component.

3.Lubrication System

• Function: Large-scale grinding machines are usually equipped with independent and mandatory lubrication systems, including oil tanks, oil pumps, coolers, filters and pipelines, specifically providing continuous, clean and cooled lubricating oil for the huge main bearings and gear transmission devices.

4.Slow-speed drive device (Auxiliary Drive)

• Function: A small power motor and reducer, used to rotate the mill at a very low speed when conducting maintenance, replacing liners, or after a long shutdown, and thus is also called the "rotating device".

Therefore, the manufacturing, procurement, replacement and maintenance of these large-scale components are the key tasks in the grinding machine management, directly affecting the operational efficiency, energy consumption and overall cost of the production line. If you have any needs, please feel free to contact us at any time. We will promptly provide you with a professional quotation.