After the cutting work is completed, the free surface can be blown according to the cutting vertical groove, and the fan-shaped blasthole is punched by the flat column rock drill in the section roadway to perform the formal mining work. The mining work of the mine mainly includes mining, mine ventilation and geological management. The specific mining work is as follows: 1) Falling mine 1 blast hole arrangement Falling ore can be carried out in the segmented roadway with fan-shaped blastholes, or parallel blastholes can be mined in the open approach on both sides of the segmented roadway. a) Vertical parallel holes in the open approach [Advantages] Small chunks, good bursting effect [Disadvantages] The rock drill moves frequently; the minimum length of the dismantling line is limited; the safety is poor; the amount of roadway engineering is increased. b) Vertical vertical fan-shaped blasthole in the segmented roadway [Advantages] It is safer to work and has higher labor productivity than in an open approach. At the same time, the amount of work is reduced. [Disadvantages] The arrangement of the blastholes is not as uniform as the parallel holes, and the bursting effect is worse than the parallel holes, and there are many large blocks. The loss of ore is large, and the ore at the boundary of the mine is not easy to pick and clean. In order to solve the uneven arrangement of the blastholes and throwing ore, for the ore bodies with larger thickness, a section of lanes can be opened along the contact lines of the upper and lower plates of the ore body. Or take a mixed arrangement. 2) Mining work The caving ore was dropped onto the bottom structure and placed on the electric raft through the funnel. The ore was dumped into the well with a 28 or 55 KW electric shovel, and was transported to the loading truck in the stage transport lane. The bucket volume is 0.3 to 0.5 m 3 . When the inclination of the ore body is less than 50° to 60°, the ore that is scraped in the lower plate is not easily released, and the ore that has been crushed increases sharply as the height of the stage increases. In order to fully recover the ore, the lower funnel is cut to allow the ore that is chiseled in the lower plate to be smoothly released. Or use an electric shovel to pour the ore that has been cut into the lower plate to the funnel (but at this time the ore body angle is required to be less than 45°). 3) Ventilation work When mining the mine, it is necessary to ensure smooth flow of the working place. Especially in the section of the rock-splitting roadway and the edge of the electric raft, the wind flow should be ensured. In order to avoid the confusion of upper and lower winds, most mines mostly use concentrated rock drilling and bursting. This will prevent the sewage from being mined from affecting the rock drilling work. 4) Mining site pressure management When the mining house is finished, it will cause a large empty area. If the ore rock falls, it may cause a large impact wave and cause disasters. Therefore, the management of ground pressure is very heavy. The work of ground pressure management mainly refers to: on the one hand, it is necessary to select a reasonable size of the mine pillar, and strictly control the exposed area and exposure time of the goaf. On the other hand, it is necessary to deal with the goaf in time to ensure the smooth progress of the mining work. Butyl Inner Tube,Bicycle Tubes Repair Kit,Bicycle Tubes Butyl 16 Inch,Bicycle Tubes Different Vavles Jiangyin Estone Trading Co.,Ltd. , https://www.estonerubber.com
Most of the small-segment mining methods use deep-hole mining, but there are many large shortages, and the secondary crushing work is relatively large. Therefore, most of the bottom structures with secondary crushing lanes are used, but the bottom structure of this form is very Less use, because it has a large amount of work, a large amount of maintenance work, and poor safety.