In mechanical equipment, in addition to thin oil lubrication, grease (short for dry oil) is also used in many friction pairs. For example: some friction pairs of blast furnace top equipment; gear ring meshing parts of furnace tilting mechanism in steelmaking workshops; some lubrication points on metallurgical cranes; flat friction pairs of rolling mill bearing blocks and frame windows in rolling mills; straighteners Straightening roller bearings, some friction pairs of shear units; bearings of roller groups, etc. According to the situation of the friction pair, there is no separate lubrication method (that is, the grease is added to the lubrication point or the grease cup by a grease gun on a regular basis manually); some are limited by the number of friction pairs and the working conditions. Difficulties with manual lubricating (such as high temperature, many lubrication points, busy manual lubricating, and difficult to access the lubricating point by manual lubricating), the dry oil centralized lubrication system is used to add grease regularly.

Classification of dry oil centralized lubrication:

The dry oil centralized lubrication system is a complete set of equipment that uses grease as the lubrication medium of the mechanical friction pair and supplies grease to the lubrication point through the dry oil station. Because the research basis of the dry oil centralized lubrication system is different, the classification methods are also different. The current general classification method is:

1. Divided according to the number of lines supplying grease to the lubrication point

(1) Single-line (single line) dry oil centralized lubrication system for grease supply

(2) Double-line (double-line) dry oil centralized lubrication system for grease supply

2. Divided according to the driving mode of fat supply

(1) Manual dry oil centralized lubrication

1—Manual dry oil station; 2—Dry oil filter; 3—Double oil feeder; 4—Branches for grease transmission; 5—Bearing pairs; 6—Direction valves;

(2) Automatic dry oil centralized lubrication system. Due to different power sources, they can be divided into two categories: electric and wind.

3． According to the layout of the two-line grease supply pipeline

(1) Outflow (end-flow) dry oil centralized lubrication system

1—Electric dry station; 2—Electromagnetic directional valve; 3—Dry oil filter; 4—Branch for grease transmission; 5—Bearing pair; 6—Reversing valve;