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Vertical chutes can form a center drop. Ore chute wear more evenly on impact, high utilization section, wellbore stability, good solid, is less likely to jam than the oblique chute, generally mine main chute are vertical chute.
The inclination of the inclined shaft should generally be larger than the angle of the powder ore of the slip ore, usually taking 65 ° ~ 75 ° . For slides with branching chutes, the length of the inclined chute is generally not more than 10~15m , and the slope of the bottom plate should be larger than the natural repose angle of the ore, usually 50~55° .
The natural repose angle of ore, rock and soil.
The ore deposit angle of the ore, see the relevant part.
(II) Structure of the upper shaft of the shaft The shape of the ore-removing port is divided into two types: bell-shaped and non-bell-shaped.
Unloading ore port should be set grizzly screen, grate determined by the specifications of the slide block discharge of ore, manganese and rail usually made of steel bars, the angle is generally 15 ~ 20 °, and some with horizontal mine grizzly. In order to facilitate the passage of the operator and the handling of large blocks, an operating platform with a width of not less than 0.8 m should be placed on both sides of the grid and opposite to the unloading direction .
In order to protect the unloading bell mouth from being damaged by the ore impact, it is preferably reinforced with rails or other wear resistant materials. The unloading port shall be provided with dustproof (spray sprinkler, slip hole closed cover), ventilation and drainage facilities.
The size of the unloading port structure shall be determined according to the unloading mode, equipment layout and unloading requirements, so as to form a center drop as much as possible, and reduce the wear of the ore to the wall.
In order to solve the damage caused by the impact of the ore flow on the chute wall when unloading into the chute, the North Mine of the Tin Mine Mining Bureau used a vibrating ore concentrating machine to reproduce the chute of the ore. The technical characteristics of the vibrating miner used are as follows: The motor power is 13kw , the vibration table size is 1.2*2.8m , the table angle is 20° , and the mined port height is 1m .
After long-term use, the ore is caused to land along the center of the chute due to the vibrating miner. Therefore, the ore flow impacts the slippery shaft and the wear of the wall has been substantially eliminated. This is a good measure to maintain the shaft of the slippery well.
(III) Structural parameters of the middle chute in the middle of the chute. Unloading of the various stages in the middle of the chute. It is usually connected to the chute by a chute.
The safety rock column between the unloading chamber and the chute is determined according to the section of the chute, the section of the diverticulum and the stability of the rock column, generally taking 4~8m . The inclination of the inclined path should be greater than the natural angle of repose of the ore, generally 50°~55°, and the length of the inclined path is generally 15m.  Within. The width of the inclined chute should generally be less than or equal to the diameter of the chute, and should be equal to or greater than 4 to 5 times the maximum block size of the ore , not less than 2 to 2.5 m . The height of the chute should be equal to or greater than 3 to 4 times the maximum block size of the ore and not less than 2 m .
(IV) Structure parameters of the slip port The slippery mouth is the mine throat, and it is often easy to block. Therefore, it is meaningful to study the reasonable structural parameters.
The number of slips depends on the amount of ore discharged from the chute.
(I) Inclination angle The slip angle of the chute mainly depends on the mineral conditions, the nature of the surrounding rock, the ore block, humidity, cohesiveness, natural rest angle, and powder ore accumulation angle.