What regulations should be met for different mining equipment?
Sand Casting, also known as sand molded casting, is a metal casting process characterized by using sand as Sand casting, The term "sand casting" can also refer to an object produced via the sand casting process. Sand castings are produced in specialized factories called foundries. Over 70% of all metal castings are produced via a sand casting process.
Sand casting is relatively cheap and
sufficiently refractory even for steel foundry use. In addition to the sand, a
suitable bonding agent (usually clay) is mixed or occurs with the sand. The
mixture is moistened, typically with water, but sometimes with other
substances, to develop strength and plasticity of the clay and to make the
aggregate suitable for molding. The sand is typically contained in a system of
frames or mold boxes known as a flask. The mold cavities and gate system are
created by compacting the sand around models, or patterns, or carved directly
into the sand.
Basic process
There are six steps in this process:
1.Place a pattern in sand to create a mold.
2.Incorporate the pattern and sand in a gating
system.
3.Remove the pattern.
4.Fill the mold cavity with molten metal.
5.Allow the metal to cool.
6.Break away the sand mold and remove the
casting.
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1 When using the bottom structure of the trench, the ore-collecting and drainage roadways should be arranged in parallel, and the inclined angle of the ore-collecting trench should not be less than 45° ; the connection between the ore-mining road and the mining roadway should be oblique. The angle of intersection should not be less than 45° ; the spacing of the loading route should be 10m~15m ; the length of the loading route should not be less than the sum of the length of the equipment and the length occupied by the pile;
2 When using the flat-bottom structure, the recovery of the triangular ore heap in the stope should use a remote-controlled scraper;
3 Diesel scraper single-pass transport distance should not be greater than 200m , electric scraper should not be greater than 150m ;
4 When using ore-free shipping equipment for mining, a safety gear should be installed at the slippery exit . The height of the gear should be 2/5 to 1/2 of the height of the equipment tire .
2. The discharge of electric rafts shall meet the following requirements:
A scraper suitable for medium production capacity stope, 500mm or less of lump ore stope ore;
2 The horizontal transport distance of the eel is not more than 40m , and the downhill transport distance should not be greater than 60m ;
3 inclined, pseudo-tilted electric winch winch chamber should be horizontally arranged, and the winch operating end should be arranged with a pedestrian ventilation patio connected with the stage transport flat road;
4 The front part of the winch shall have the protection facilities for the anti-break rope return; the distance between the side of the chute and the most prominent part of the winch near the chute shall not be less than 2.0m ; the intersection of the electric ramp and the ore chute shall be provided with a sidewalk with a width of not less than 0.8m ; The height difference between the floor of the electric sill chamber and the entrance of the chute should not be less than 0.5m ;
5 When using electric shovel to mine, the electric shovel should have independent inlet and return air passages; the direction of shovel transportation should be opposite to the direction of airflow; the communication road between electric shovel should be located on the air inlet side, and It should be placed on the side or rear of the electric winch chamber.
Third, the vibration discharge machine mining should meet the following requirements:
1 The vibrating ore concentrating machine should be used for the stope and the runoff of the bottom structure of the funnel and the trench;
2 The parameters of the vibrating and concentrating machine and the geometric parameters of the vibrating table shall be calculated and determined according to the physical and mechanical properties of the ore, the natural repose angle of the ore, the ore cohesiveness, the maximum blockiness, the amount of ore discharged, and the ore transportation equipment;
3 The inclination angle of the vibrating ore concentrating machine should be 10° to 20° . When the ore fluidity is good, it should take a small value. When the ore fluidity is not good, it should take a large value;
4 The height of the lower end of the vibrating ore concentrating machine and the top surface of the mine car should not be lower than 200mm .