How to choose the mine loading process
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    (1) non-ferrous metals should be used open pit mine excavator loading process; the bulk material should use standard bucket, rock hard materials should be selected buckets, when the floor is not flat, should use a backhoe excavator;
    (2) Shovel loading with large amount of excavation, looseness or consolidation without dense soil rock, optional loading technique of rope bucket excavator;
    (3) Shovel loading of sand mine and soft topsoil and weathered rock, optional wheel shovel loading process;
    (4) For short-loading and loose material shipment, the loader loading process can be adopted;
    (5) The materials are loose, the loading surface is smooth and open, and the transportation distance is 800m ~ 2000m . The scraper loading process can be adopted.
    2 single row of holes blast, when using motor transport, the minimum width of the working platform is to comply with Table 7.6.2-1; with railway transport, the minimum width of the working platform is to comply with Table 7.6.2-2.
Table 1-1 Minimum working platform width for car transport ( m )
Platts coefficient
( f ) Step height ( m ) 8 10 12 15 >12 30 to 32 32 to 36 36 to 41 42 to 48 6 to 12 27 to 29 29 to 31 32 to 35 38 to 41 < 6 25 to 27 27 to 29 30 to 32 35 to 38
Table 1- 2 Minimum working platform width of railway transportation ( m )
    Note: When using multi-row hole differential blasting, the value in the table needs to increase the blasting belt width corresponding to the multi-row hole. Platts coefficient ( f ) Step height ( m ) 10 12 15 Quasi-rail Narrow gauge Quasi-rail Narrow gauge Quasi-rail Narrow gauge >12 39 to 41 37 to 39 44 to 46 42 to 44 54 to 56 52 to 54 6 to 12 34 to 36 32 to 34 39 to 41 37 to 39 46 to 48 44 to 46 <6 29 to 31 27 to 29 34 to 36 32 to 34 38 to 40 36 to 38
    3 The minimum working line length of the single bucket excavator can be selected according to Table 3 .
Table 3 Minimum working line length of single bucket excavator
Bucket volume (m 3 ) Railway transportation ( m ) Car transport (m) Single row hole blasting Multi-row hole extrusion blasting 1 to 2 200 to 300 150 100 4 450 200 150 ≥8 ≥500 ≥300 ≥200
    4 Two or more excavators work on the same platform. When transporting the vehicle, the distance between the excavators should not be less than 3 times of the maximum digging radius and should not be less than 50 m . When the locomotive is transported, the distance between the excavators should not be less than two columns. The length of the train.
    5 Excavators working at the same time on the upper and lower steps should be staggered along the steps; the excavator assisting the safety belt at the edge of the upper step should be 3 times the maximum excavation radius of the excavator working normally in front of the lower step . And should not be less than 50m .