Tapered
Roller Bearings
Tapered roller bearings are mainly suitable
to carry combined load---radial load and as well as axial load; While steep
angle tapered roller bearings (27°-30°) can carry the combined load dominated
by the axial load. The tapered roller bearings are separable bearings, their
internal assemblies and outer rings can be mounted separately; the radial
clearance and axial clearance can be adjusted when mounting and interference
fits are also allowed.
Structures
1.30000
type single-row tapered roller bearings
This type of bearings can accommodate the
axial displacement and axial load on one direction on the shaft or housing. An
additional axial force will be generated under the action of radial load, so
the outer ring and inner ring inside the two bearing slewing should be mounted
with their end faces with same name opposite each other. When applied
separately, the applied axial force must be larger than the additional axial
force.
2.350000
and 370000 types of double-row tapered roller bearings
These types of bearings comprise one
double-raceway outer ring (one double-raceway inner ring) and two inner rings
(two outer rings). There is a spacer between the two inner rings (two outer
rings), To change the thickness of the spacer can adjust the bearing clearance.
They can carry radial and double-direction axial load simultaneously.
3.
380000 type four-row tapered roller bearings
This type of bearing adopts two
double-raceway inner rings, one double-raceway outer rings and two single
raceways. There are spacers between inner rings and outer rings used for
adjusting bearing clearance. They can accommodate large radial load. But their
limit rotational speed is low so they are mainly applied to heavy-duty machines
such as rolling mills.
Cage
materials
Tapered roller bearings generally adopt steel
sheet cages, when with too large sizes, use welded steel sheet cages or steel
pinned solid cages.
Permissible
tilt angle
Generally, inclination is not allowed between
the shaft and the housing on the tapered roller bearings. If any, it should not
exceed 2'.
Tolerance
and Clearance
Generally, the tolerance classes of tapered
roller bearings is P0, also can produce higher tolerance classes bearings
according to the requirement of users. The tolerance value is showing in the
section [the tolerance of rolling bearing".
Users can adjust for practical clearance for
the single-row tapered roller bearings according to different demands. The
radial clearance of double-row and four-row tapered roller bearings is showing
in the table 1.
Dynamic equivalent radial load
Single-row tapered roller bearings:
Pr = Fr When Fa/ Fr≤e
Pr=0.4Fr+YFa When Fa/Fr>e
When applying single-row tapered roller
bearings in pairs, the additional axial force must be counted when computing
the equivalent dynamic load of the bearings. The axial load magnitude is
influenced by mounting methods and the applied axial load and the detailed
computing method is same as angular contact Ball Bearings.
The additional axial load on the single-row
tapered bearings can be approximately computed with the equation below:
S=Fr/2Y
Double-row tapered roller bearings:
Fa/Fr≤e Pr=Fr+Y1Fa
Pr=Fr+Y1Fa When Fa /Fr≤e
Fa/Fr>e Pr=0.67Fr+Y2Fa
Pr=0.67Fr+Y2Fa When Fa/Fr>e
Static equivalent radial load
Single-row tapered roller bearings:
P0r=0.5Fr+Y0Fa
If P0r<Fr, take P0r=Fr
Double-row and four-row tapered roller
bearings:
P0r=Fr+Y0Fa
In the
equation:
Fr Actual radial load of the bearing
Fa Actual
axial load of the bearing
e.Y.Y1.Y2.Y0 see the bearings dimension table.
In order to prevent damaging sliding
generated between the rollers and raceway, a minimum radial load must be acted
on the bearing. The calculating formula is:
Frmin=0.02C
In the
equation: Frmin Minimum
radial load
C Basic dynamic radial load rating
Single Row Tapered Roller Bearing,Double Row Tapered Roller Bearing,Four Row Tapered Roller Bearing Xibei Bearing Co.,Ltd. , https://www.nxzjck.com
Industrial type of vein gold ore
Gold ore types are divided in different ways. According to the actual situation in China. In the mineral processing, the vein gold ore is often divided into the following types:
(1) Less sulfide containing gold ore. Gold is the only object of recycling, and other minerals are either of no industrial value or are only recycled as by-products. Sulfide-based mostly pyrite, low content, sometimes associated with a small amount of Cu, Pb, Zn, Mo and other minerals. Most of this ore is quartz vein type or fine vein impregnation type (hydrothermal alteration type). The natural gold particle size in the ore is relatively coarse, and the product is single. It can be recovered well by a simple flotation process.
(2) Polysulfide containing gold ore. The ore is rich in pyrite or arsenopyrite. There is also a recycling value. The gold grade is low and the change is small. The natural gold particles are relatively small and are mostly wrapped in pyrite. It is easy to select gold and sulfide from such ores, but to separate the gold from the sulfides requires a more complicated process.
(3) Polymetallic gold ore. Such ores contain in addition a gold stylish, two kinds of metallic minerals, copper, lead silver zinc, tungsten and antimony, which in turn has a single value of mining. Its main feature is that sulfide minerals account for a considerable amount (10% to 20%); natural gold is closely related to pyrite, and most of them are closely symbiotic with copper, lead and other minerals; natural gold particles have a wide variety, so the need for such ore More complicated process of selecting and smelting.
(4) Gold ore containing antimony gold. In addition to natural gold, there is still a considerable amount of gold in the form of bismuth gold, mostly low-temperature hydrothermal deposits.
In addition, another classification similar to the above classification is common in gold mines in China.
1 Quartz vein contains gold ore. The basic component of the ore is quartz, the content of which is 50% to 95%, and the metal mineral content is 0% to 15%.
2 Pyrite contains gold ore. Sulfide (pyrite) content is high (5% to 15%). More than 75% of gold minerals are closely symbiotic with pyrite.
3 multi-metal gold ore. Metal minerals contain useful minerals such as copper, lead, and zinc sulfides in addition to iron sulfide.
4 special minerals containing gold ore. Gold ore in ore, uranium and other ores.
5 quartz veins contain gold oxide ore. Oxidized ores are generally present in the shallower surface oxidation zone. According to the degree of oxidation, it can be divided into partial oxidation ore and oxidized ore. The presence of gold-containing iron hydroxide is a major feature of the mineral composition of the ore. The main metal mineral is limonite with less sulfide and the gangue is mainly quartz. Most of the natural gold minerals are found in major gangue minerals and metal oxides, and the gold-bearing grade is relatively high.