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In recent years, individual mines have tried to replace the wooden funnel, steel funnel and concrete funnel with the light vibrating miner, and the gravity from the shovel to the forced forcing of the ore, thus improving the fluidity of the ore and achieving a good technical economy. effect.
The funnel-type bottom structure for mining thick ore bodies, due to the widespread use of medium-deep hole ore deposits, the ore block size is large, and there is often a secondary crushing horizontal layer. In the secondary crushing horizontal layer, the bottom structure of the electric raft is used. When the thickness of the ore body is greater than %&, a multi-row funnel is used, and the arrangement of the funnel is symmetric and staggered, and the latter has less ore remaining in the funnel ridge. The mining area of ​​each funnel is preferably about 50m2. When the inclination angle of the ore body is not steep enough, in order to reduce the loss of ore remaining in the floor, a funnel or a bottom should be arranged in the surrounding rock of the floor to ensure that the angle of the funnel slope can meet the requirement of self-slip, and the edge of gravity is slipped by the empty field method. The slope angle should not be less than 50~55° and the caving method should be no less than 65°~80°.
The determination of the length of the transport lane is higher than the length of the transport lane. In addition to considering the stability of the rock, the volume of the slip mine 2 should be considered to adjust the contradiction between the transport of the electric ramp and the lower transport. The bottom structure of the grid is set in the secondary crushing horizontal layer. In the past, it was used more in the stage caving method. The surface of the mine roadway has funnel-like and gully-like shapes, and the labor consumption of the latter's mining roadway and bottoming is reduced. About 12%, improve the safety of work, eliminate the manual labor of cleaning the ore in the bottom, and increase the labor productivity of the sieve machine by about 20%.
The installed sieve should have a slope of 2°~3° to the broken chamber, and the ore pile flowing out of the funnel should not exceed 1/3 of the total area of ​​the sieve. The height of the bottom column is 12~18m, and the amount of bottom column minerals accounts for 20~30% of the mining volume.
The advantages of the sieved funnel crushing the bottom layer of the horizontal layer are: (1) The ore-mining process is easy to manage, the mine can be strictly placed as planned, and the ore can be stopped quickly. Therefore, it helps to improve the loss and depletion indicators of the caving method; (2) has a broad prospecting line; (3) in the ore mining and transportation, the ore gravity can be utilized, the ore mining cost is low, and the energy consumption is small. . The disadvantages are: (1) the length of the roadway with the specified cutting is large, and the length of all the roadway in the bottom column of the grid-breaking horizontal layer is increased by 20~50% compared with the bottom of the electric layer horizontal layer; (2) It is difficult to mechanize the excavation of various short and small section roadways on three horizontal levels separated by a large height. Due to the large number of roadways and low labor productivity, the mining labor consumption of the grid-breaking horizontal layer bottom column is 25~30K higher than that of the electric horizontal layer bottom column, and the mining cost is also increased accordingly; (3) Construction and equipment a drain port workload grate transfer chamber, which generally increases capital scraper than 2 to 4 times; (4) and large repair costs grizzly screen grate chamber; and (5) Storage pillar of ore Large, 1 times higher than the electric bottom column. Due to the cutting failure of the bottom column, the ore loss rate is as high as 50% when recovering part of the ore; (6) the labor consumption of the ore mining work is very high, and the grid sieve is 30~80% more than the horizontal column of the electric raft; 7) The accident rate of ore mining is 50~80% higher than that of electric power; (8) The sanitary conditions are poor.
Due to the above-mentioned shortcomings of the funnel-type bottom structure of the grid, it has rarely been used after the emergence of a highly efficient scraper.
As shown in the funnel-type bottom structure combined with vibrational ore-mining and mine-car transport, the diverting chamber 2 of the vibrating miner 3 is staggered on both sides of the transport cross-section, and the funnel 5 and funnel are excavated above the diverticulum 2. Neck 4. Compared with the bottom structure of electric tapping, it has the following characteristics: (1) the horizontal layer without electricity, the bottom structure is simpler, and (2) the length of the chamber 2 of the vibrating miner The length of the mine is long, which is conducive to the maintenance of the peach-shaped pillar; (3) the corner of the funnel is 5~10% smaller, and the ore discharge area of ​​each funnel is larger; (4) The ore in the funnel neck can Full-section flow, less chance of large blockage, (5) Secondary crushing is carried out on the vibrating miner, which may break the vibrating miner.
What is a funnel bottom structure?
The bottom structure of the funnel-type mine roadway is the earliest and most widely used. The steeply inclined thin veins and the thick ore body have different forms in the funnel-type bottom structure. The former uses shallow holes to mine, the ore block is small and uniform, and generally there is no secondary crushing horizontal layer. When the ore grade is low, the bottom structure of the bottom column is used. When the ore grade is high (or high value), the bottom structure of the artificial false bottom is constructed by pit wood or reinforced concrete. The use of concrete to form a false bottom, although the cost is higher than that of the pit wood, the formation period is longer, but the maintenance workload is small, and the ability to withstand the ground pressure is strong, which can better solve the problem of empty area treatment.