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( 1 ) The bottom structure of the stope. The bottom structure of the stope that is transported by the trackless equipment generally adopts a flat bottom type and a trench type; the three horizontal layers of bottoming, mining and transportation are combined into one. The bottom structure is simplified, leaving no bottom column, or the amount of minerals in the bottom column is small.
One of the common bottom structure forms for trackless equipment transport. It is a flat bottom structure with a single side layout of the mining roadway. Fankou lead zinc ore in the floor structure using such process VCR.
( 2 ) The specification of the mining roadway is greatly affected by the outer dimensions of the trackless equipment. The width and height of the section of the mining roadway are determined according to the size of the scraper.
The length of the straight section L of the mining roadway must be greater than the length of the scraper and the length of the ore pile in the ore roadway. Otherwise, the scraper cannot perform front shovel loading, affecting the shovel loading effect, and the scraper The mechanical wear is exacerbated.
When the mining roadway turns, its radius of curvature R is related to the characteristics of the scraper. The R value is generally not less than 8~10m .
The selection of the spacing d of the mining roadway should consider the stability of the ore rock, make the mining roadway easy to maintain, and consider the minimum amount of ore heap remaining in the stope between the two ore mining roadways. When discharging ore under the rock, the ore loss and depletion should be considered, and the d value should be compatible with the flow characteristics of the ore.
( 3 ) Arrangement of mining roadway and chute. The layout of the mining roadway depends on the width of the mining site b and the thickness of the ore body. When the width b of the mining site is less than 10~12m , the ore roadway is arranged on the side of the stope . When the width b of the stope exceeds 20 m , the two in the stope The mining roadway is arranged on the side, and the transportation roadway connecting the various mining roadways is arranged on the side of the mining side. Meishan of iron ore without use of the latter pillar sublevel caving, the transport tunnel arranged in the center ore body, the workings disposed on both sides thereof.
The chute for the stope is generally arranged according to the economical and effective transport distance of the scraper. The general chute spacing is 200~300m . When the loader is used with the truck, the chute spacing can be expanded.
( 4 ) The ore grade of qualified ore increases. When transported by trackless equipment, the qualified ore block value depends first on the bucket volume. When using a scraper with a bucket capacity of 3~4m3 , the qualified ore block size can be increased to 1200mm . The relationship between the value of qualified ore and the volume of the bucket.
The qualified ore block weight is increased to 1200mm , the unqualified bulk yield can be reduced, and the secondary crushing work is reduced. It is beneficial to improve the production efficiency of the transport equipment, and the production capacity of the stope is also increased accordingly to achieve high-intensity centralized operation. Conducive to production management.
What is the bottom structure of the trackless equipment?
After the use of trackless equipment in the stope, the following changes have occurred in the bottom structure of the stope in order to adapt to the characteristics of the trackless equipment: