Xihuashan tungsten ore thin ore vein mining and mining method

West Huashan tungsten ore as late magmatic hydrothermal veins feldspar quartz vein type wolframite deposits. The veins are divided into multiple groups and buried shallowly. The groups are far apart from each other and are stepped along the slope. The veins along the strike are side curtain--a side curtain-shaped vein is formed by a series of parallel short veins with a length of about 20-40 m. The extension length is generally 400-600, and the longest is up to 900m; the short veins are connected to form a side curtain on the stage, and the shape of the horizontal section is as shown in Fig. 1. The distance between each of the two short veins that follow each other is generally 0.5 to 1.2 m in the vertical direction. The thickness of the vein is 0.2 to 0.5 m, and the thickest is 3.6 m. The inclination angle is above 70Â°. The buried depth of the veins is an average of 74m. The distance between each side of the curtain is 10 to 30 m. The veins and surrounding rocks are hard and stable, the contact is obvious, and it is difficult to separate.

Figure 1 Side curtain vein map

The stage height is 38 to 58 m with an average of 46 m. The length of the nugget is generally 60m and the minimum is 40m. Other parameters are shown in Figure 2.

Figure 2 Retaining method for retaining the bottom column, leaving the top column, and the column

1-stage transportation roadway; 2-bottom column; 3-patio; 4-return roadway; 5-reserved heap

The minimum take-up is 0.8m. In order to improve the ore-extracting conditions, the mining width is not less than 1 m in the range of 3 to 4 m in the lower part of the mine.

Due to the high grade of the ore, the bottom column left, after the mining of the corresponding position in the next stage, selects a part with a higher grade and releases it together with the ore in the lower stop.

The Tapered Roller Bearing belongs to the separation type bearing, and the inner and outer rings of the bearing have a conical raceway. This type of bearing is divided into single, double and four row tapered Roller Bearing according to the number of the roller. The single row Tapered Roller bearing can bear the radial load and the single direction axial load. When a bearing is subjected to a radial load, an axial force will be produced, so another bearing that can withstand the axial force of the opposite direction is needed to balance it.

There is a single row tapered roller bearing outer ring, the inner ring and a conical roller by maintaining a basket frame into the inner module. The outer ring can be separated from the inner ring assembly. According to the standard of the ISO tapered roller bearing dimension, any standard type tapered roller bearing outer ring or inner ring assembly should be able to achieve international interchangeability with the same type of outer ring or inner ring assembly. For example, the outer ring of the same type should conform to the ISO492 (GB307) rule besides the external dimension and tolerance. The conical angle of the inner ring assembly and the diameter of the component cone must also comply with the relevant provisions of the interchangeability.
Usually, the conical angle of the outer raceway of the single row tapered roller bearing is between 10 degrees ~19 degrees, and it can simultaneously bear the joint action of axial load and radial load. The larger the cone angle, the greater the ability to bear the axial load. The bearing of the big cone angle, the postposition code plus the B, the cone angle between 25 degrees ~29 degrees, can bear a large axial load. In addition, the single row tapered roller bearing can adjust the size of the clearance during the installation process.
The outer ring (or inner ring) of a double row tapered roller bearing is a whole. The two inner ring (or outer ring) has similar small end faces, and the middle has a spacer. The clearance is adjusted by the thickness of the spacer, and the pre interference of double row tapered roller bearings can also be adjusted by the thickness of the spacer.
The performance of the four row tapered roller bearing is basically the same as that of the double row tapered roller bearing, but the radial load of the double row tapered roller bearing is greater than that of the double row tapered roller bearing, and the limit speed is slightly lower, which is mainly used for heavy machinery.
Multi seal double, four row tapered roller bearings, ZWZ provides long life, multi seal double, four row tapered roller bearings. The new design of the bearing is personalized and the traditional design method of the fully sealed bearing is changed. A new seal structure combined with seal and dust-proof is adopted to improve the sealing effect and improve the sealing performance. Compared with open structure bearings, the life of multi seal double and four row tapered roller bearings increased by 20% to 40%, and the consumption of lubricants was reduced by 80%.

Tapered roller bearings are widely used in automobile, rolling mill, mine, metallurgy, plastic machinery and other industries.

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