In mechanical equipment, in addition to thin oil lubrication, grease (dry oil for short) is also used for lubrication in many friction pairs. For example: some friction pairs of blast furnace top equipment; the meshing parts of the ring gear of the furnace tilting mechanism in the steelmaking workshop; some lubrication points on the metallurgical crane; the plane friction pairs of the bearing seat and the frame window of the rolling mill; straightening machine Straightening roller bearings, some friction pairs of the shearing unit; bearings of the roller table group, etc. Depending on the situation of the friction pairs, there is no separate and dispersed lubrication method (that is, manually adding grease to the lubrication points or grease cup with a grease gun regularly); in some cases, due to the large number of friction pairs and limitations of working conditions, If there are difficulties with manual greasing (such as high temperature, many lubrication points, too much manual greasing, and difficulty in accessing the lubrication points for manual greasing), a dry oil centralized lubrication system should be 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 for mechanical friction pairs and supplies grease to the lubrication points through the dry oil station. Since the research basis for dry oil centralized lubrication systems is different, the classification methods are also different. The current general classification method is:

1. According to the number of pipelines supplying grease to the lubrication point

(1) Dry oil centralized lubrication system with single pipeline (single line) grease supply

(2) Dry oil centralized lubrication system with dual pipeline (double line) grease supply

2. According to the driving mode of fat supply

(1) Manual dry oil centralized lubrication

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1—Manual dry oil station; 2—Dry oil filter; 3—Two-line oil feeder; 4—Grease delivery branch pipe; 5—Bearing pair; 6—Reversing valve; Ⅰ, Ⅱ—Grease delivery main pipe

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

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

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

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1—Electric dry oil station; 2—Electromagnetic reversing valve; 3—Dry oil filter; 4—Grease delivery branch pipe; 5—Bearing pair; 6—Reversing valve; Ⅰ, Ⅱ—Grease delivery main pipe