Recently, it was learned from the Beijing Municipal Environmental Protection Bureau that the draft of the sixth phase of Beijing's vehicle emission local standards has been released recently, including three standards for light vehicles, heavy vehicles and heavy engines. “Jingliu†is known as the world’s most stringent motor vehicle emission standard, and the new standard for light vehicle emissions will be about 40% more stringent than the current implementation of the National Five Standard. The “Jingliu†standard is scheduled to be implemented on December 1, 2017. The vehicle must be stable and up to standard during the effective life The research results show that PM2.5 formed by motor vehicle emissions accounts for about 31% of the city's PM2.5 source and is the first source of pollution. At the same time, the nitrogen oxides emitted by motor vehicles account for about 57% of the city's total nitrogen oxide emissions, and the volatile organic compounds emitted account for about 38% of the city's total volatile organic emissions. Nitrogen oxides and volatile organic compounds can also form PM2.5 and ozone pollution through chemical reactions. According to the Beijing Municipal Environmental Protection Bureau, international practical experience shows that tightening vehicle emission standards is an important measure to reduce vehicle emissions and improve the quality of the atmospheric environment. Since February 1, 2013, Beijing has implemented the fifth phase of local standards for motor vehicle emissions (referred to as “Beijing Fiveâ€, equivalent to the “Euro Five†standard). “Jingliu†will implement the most stringent motor vehicle emission standards in the world. In accordance with the “Beijing Clean Air Action Plan 2013-2017â€, the Beijing Municipal Environmental Protection Bureau organized and formulated the sixth phase of Beijing's motor vehicle emission standards. The Municipal Environmental Protection Bureau stated that the “Jingliu†emission standards continue to tighten the emission limits, and at the same time further enhance the sense of responsibility of automobile manufacturers, requiring vehicles to achieve stable compliance within the effective life. The world's first heavy vehicle emission standard According to the introduction of the Municipal Environmental Protection Bureau, this time, drawing on the world's most stringent motor vehicle emission standard system, namely the California standard, the “Jingliu†light vehicle emission standard was formulated. It is expected that the new standard will be about 40% more stringent than the current implementation of the National Five. Since the “Jingliu†standard adopts a mature standard system, the current US market has corresponding standards for compliance. Automobile companies can produce and supply standard vehicles within a certain period of time, and vehicle costs will not increase significantly after mass production. In addition, for heavy-duty vehicle emission standards, the “Jingliu†heavy-duty vehicle standard is a newly added and internationally pioneering standard. At present, countries around the world, including China, have only set heavy-duty engine standards for new vehicle emissions, and there are no new vehicle emission standards for heavy-duty vehicles. In order to strengthen the emission control of heavy-duty vehicles, Beijing has also formulated the “Jingliu†heavy-duty vehicle emission standards. The above-mentioned standard consultation drafts are open for public comment on the website of the Beijing Municipal Environmental Protection Bureau and the website of the Beijing Municipal Bureau of Quality Supervision. The "Jingliu" standard will be formulated and released in accordance with the procedures and is scheduled to be implemented on December 1, 2017. focus Bicycle emissions will drop by 40%-50% In the past ten years, Beijing's air pollution control work has made some progress, but there is still a big gap between the public's expectation of air quality and national standards, especially the problem of particulate matter is still prominent. The annual average concentration of PM2.5 pollutants in 2014 was 85.9 μg/m3, which was 1.45 times higher than the national standard of 35 μg/m3; if according to the World Health Organization's third-stage target value (standards implemented by developed countries such as the United States) The annual average standard of PM2.5 pollutants is 15 μg/m3, which is about 5 times higher than the standard. In 1999, 2002, 2005, 2008 and 2013, Beijing implemented the first, second, third, fourth and fifth stage emission standards and corresponding oil standards, all of which were 3 years ahead of the national level. Good emission reduction effect. It is expected that the implementation of the “Beijing Six†standard will reduce the emissions of light-duty gasoline vehicles and heavy-duty diesel vehicles by 40%-50%. In addition, the current city's motor vehicle ownership exceeds 5.5 million. Every year, about 600,000 new vehicles and new vehicles are installed in the city. After the implementation of the “Beijing Six†standard, after 4-5 years, about 50% of the vehicles in the city will reach the “Beijing Six†standard, that is, in 2022, the city The overall pollution of motor vehicles will be reduced by about 20-30%. Compared to other rolling-element bearings, Slewing Bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel are 4 metres diameter and fit over a 3.5 metre axle. Slewing bearings resemble oversize aircraft control surface bearings. Slewing Bearings Slewing Bearings,Slewing Ring Bearing,Single-Row Ball Slewing Bearing,High Precision Slewing Bearings Ningbo Ritbearing Imp & Exp Co.,Ltd. , http://www.ritbearingchina.com
A slewing bearing or slewing ring is a rotational Rolling-Element Bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill.
Slewing bearings often use two rows of rolling elements. They often use three race elements, such as an inner ring and two outer ring "halves" that clamp together axially.
Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.
As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used.
·The world's most stringent "Jingliu" standard is scheduled to be implemented in December 2017