2 Lifting container selection Shaft lifting containers can be divided into buckets and cages. According to the number of lifting ropes, it can be divided into single rope lifting and multi rope lifting. According to the number of lifting containers, it can be divided into single cage lifting and double cage lifting. The wire rope diameter and lifting equipment required for single rope lifting are large. Compared with single rope lifting, multi-rope lifting has the advantages of improved safety, light weight of equipment and small diameter of steel wire rope. However, it is a disadvantage to build a well tower with high cost and long construction period. For multi-level mining of metal mines, the cage is usually lifted in a single container, and the bucket is lifted with a double container.
(1) Selection of main well lifting container The quantity and specification of the main well lifting container are mainly determined according to the annual output of the mine, the depth of the wellbore and the number of working days of the mine. Generally, metal ore and non-metal mines have a depth of about 300m and a daily output of 700t . The ore is used to raise ore. The depth of the well is more than 300m . When the daily output is more than 1000t , the bucket is used for lifting.
If the main well is upgraded, in addition to raising the ore, it is necessary to increase the waste rock, and then add the amount of waste rock in the annual output of the mine. The amount generally accounts for 15-20% of the annual output of the mine .
When the main and the bucket are used for lifting, the standard bucket can be selected according to the reasonable lifting amount and the ore weight.
If the main well is raised by a cage, firstly, according to the specifications of the mine car transported by the mine, it is decided to select the tank that is suitable for it, and then according to the reasonable lifting amount obtained, determine the number of loadings per cage or the cage layer.
Generally, single-layer bicycle common cages are used. If the lifting amount cannot meet the requirements, you can consider using a bucket or a multi-layer multi-vehicle cage. The single-layer double-vehicle cage is easier to access than the double-layer cage, and the lifting time is less. However, the disadvantage is that the section of the wellbore is large.
(2) Selection of auxiliary well lifting vessels The auxiliary wells are all raised by cages, used as upper and lower personnel and for lifting waste rock and material equipment. The specifications of the cage are determined according to the specifications of the mine car used in the mine. When designing, try to use a single-layer car cage. After the primary cage is selected, it should be checked according to the maximum class workers' downtime and the maximum class net operation time. When the maximum class increase time is calculated, it is not more than 6h . If the total time exceeds 6h , multi-vehicle or multi-layer cages should be considered.
(3) Structure and arrangement between ladders
The "metallurgical safety rules" provides steeper than 45 ° or as a mine safety outlet shaft, must be provided between the ladder, primarily as a downhole safety outlet during sudden accident, usually to lift a container inspection apparatus and the wellbore occurs malfunction.
(4) Arrangement between pipe and cable
Mainly various pipelines (drainage pipe, pressure pipe, water supply pipe, discharge pipe) and other cables (power, communication, signal, etc.), usually arranged in the auxiliary well and close to the ladder. The pipe is fixed to the ladder beam or the tank beam with a U -shaped screw card. The brackets of various cables are fixed on the wall of the well near the ladder. The power cables and signal and communication cables are preferably arranged on both sides of the ladder. If they are to be arranged on the same side, the distance between the two is greater than 0.7m.
(5) Clearing the gap between the container and the tank beam and the well wall According to the “Safety Regulations for Metallurgical Minesâ€, the various gap data are shown in the following table. Lift the gap between the tank ear and the tank path, the rail tank road shall not exceed 5mm on each side ; the wooden tank road shall not exceed 10mm on each side ; the additional sliding tank ears of the combined steel tank road shall have a gap of 10~15mm on each side ; The diameter of the tank slide sleeve is no more than 5mm than the diameter of the tank rope .
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