Coal washing machinery is a common type of equipment in the field of coal preparation, with long working hours, high loads, fast operation, and frequent equipment damage. How can we reduce such damage?

　　1. Adding a type of substance with lubricating properties to the friction surface of the coal washing machine body to eliminate direct contact and reduce friction and damage is called lubrication.

　　2. Equipment lubrication is a crucial step in equipment maintenance work. Lack of oil or deterioration of grease in the equipment can cause malfunctions in the coal washing machine, which is likely to damage the accuracy and effectiveness of the equipment. Proper lubrication of equipment plays a crucial role in reducing malfunctions and minimizing damage to machinery components.

　　3. Lubricants can firmly adhere to the friction surface of coal washing machinery, forming a type of oil film. This type of oil film has a strong bonding force with the friction surface of the machine parts. The two friction surfaces are separated by lubricants, making the friction between coal preparation equipment parts become the friction between the molecules of the lubricant itself, thereby reducing friction and damage.

　　When water molecules enter the range of the gravitational field on the solid surface of coal washing machinery, they can interact with polar particles on the solid surface, interact with each other, and arrange them in a directional manner according to the principles of electric isotropic repulsion and anisotropic attraction. The closer the water molecules are to the solid surface, the greater the gravitational force on the surface particles, and the more regular and dense the arrangement; The farther away the coal washing machine is from the solid surface, the less attractive the surface particles are to the water molecules, and the more sparse and disorderly their arrangement becomes; When the surface gravity is zero beyond the distance, water molecules remain in a free state; The transition layer between ordinary water and solid surface is called a hydration layer or hydration film; The hydration layer can reach a thickness of hundreds, thousands, or even tens of thousands of water molecules. In water, the surface layer of minerals interacts with water molecules, causing water molecules to form a directional arrangement on the mineral surface, forming a hydration layer or hydration film. This type of action is called the hydration of the mineral surface layer.