Due to the Ministry of Construction’s request to restrict the use of galvanized pipes in newly built residential buildings from 1997 onwards and recommending the use of new types of pipes such as aluminum-plastic composite pipes, the market for aluminum-plastic composite pipes became active at the same time and became a domestic one in just a few years. New investment hot spots, and reached a high peak of investment in early 2000, once appeared more than 20 equipment manufacturing plants, more than 300 aluminum-plastic composite pipe production plants, more than 500 production lines and more than 30 supporting pipe fittings production plants.
However, after several years of survival of the fittest and several rounds of consolidation, small plants have gradually withdrawn from the market, and new competitors have little chance of entering and will maintain steady development in the coming years.
As China's residential construction is still maintaining a strong momentum of development, experts predict that by 2008, the plastic pipe in the domestic pipeline market share will reach 70%, by 2010 will reach 80%. In the new national policy, aluminum-plastic pipes and cross-linked aluminum-plastic pipes are listed as the preferred products in building water supply plastic pipes; at the same time, cross-linked aluminum-plastic pipes are also preferred products for building heating plastic pipes. With the deepening of people's understanding of various new types of pipes, mature products with perfect product standards and application specifications have a lot of market prospects.
Spherical roller bearings have two rows of rollers that are mainly subjected to radial loads, but also axial loads in either direction. It has a high radial load capacity, which is especially suitable for working under heavy loads or vibration loads, but cannot withstand pure axial loads. The raceway of the outer ring of this type of bearing is spherical, so its self-alignment performance is good, and it can compensate for the coaxiality error.
There are two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, the inner ring has two raceways inclined to an angle with the bearing axis, has good self-alignment performance, when the shaft is bent or installed differently when the bearing can still be used normally, the self-alignment varies with the bearing size series, the general allowable self-alignment angle is 1~2.5 degrees, the load capacity of this type of bearing is larger, in addition to being able to bear the radial load, the bearing can also bear the axial load of two-way action, and has good impact resistance, In general, spherical roller bearings are allowed to operate at a lower operating speed.
Spherical Roller Bearings,Precision Ball Bearings,High Temperature Bearings,Spherical Roller Thrust Bearing
Hebei Fangqiang bearing manufacturing Co., LTD , https://www.fangqiangbearing.com