" />" /> 在线观看黄色视频网站,内射 无码 在线播放,嫖老熟女a片一二三区

亚洲国产欧美在线_亚洲欧美日韩中文字幕在线不卡_国产精品天堂AVAV在线_了解最新亚洲无码床_美女18隐私免费网站_日韩专区系列免费内射第一页_青青久久中文视频_欧美性午夜在线观看_天堂网AV在线播放_亚洲无日韩码精品第一页

中文English
Tell:023-68406009
News
Tree:News - Company news
Harmfulness of Polluted Oil to Hydraulic System
Click:3409  UpDateTime:2014/2/10 16:52:49
    With the production of enterprise there are large expenses for oil annually, which always keeps the production cost at a high level. In order to decrease production cost as much as possible, many enterprises try to save oil expenses, which shows up in changing oil not timely and irregularly. The oil in use does not reach the standard of equipment operation, resulting in oil pollution, re-doing work pieces and even suspension of production to recondition. The losses are serious.
    The research of Chinese Mechanical Engineering Society shows that: 80% of mechanical breakdown is caused by frictional wear. Therefore, to improve equipment lubrication, control friction and reduce wear are important measures to save materials, reduce equipment breakdown, improve operating condition, raise the level of quality, reduce pollution, extent equipment service life, save energy, decrease cost and improve economic performance.

Harmfulness of Water in the Oil

1. Low water content: It will accelerate the aging of hydraulic oil. The water will produce chemical reaction with additives in the oil under certain condition, causing degradation or even no effect of certain using performance in the hydraulic oil.
2. High water content: hydraulic oil mingling with water produces emulsified oil, making blocking properties of lubricating oil decreases. Insufficient adhesive force of hydraulic oil to friction surface and damage of oil film can cause abnormal mechanical wear and even result in mechanical breakdown.

Harmfulness of Gas in the Oil

    The bubbles in hydraulic oil can damage the oil film, resulting in dry friction of mechanical equipment and even mechanical breakdown!
1. The work performance of hydraulic pump goes bad (Shows up in bad performance of hydraulic pump and its short service life).
2. Noise and vibration: When bubbles flow along with oil to the place in higher pressure, the bubbles are compressed in smaller volume and greater density. At this moment, certain energy is saved inside the bubbles. When the pressure is increased to certain values, the bubbles will explode, produce partial hydraulic shock, make the system vibrate and the partial pressure up to dozens of MPa , and meanwhile produce explosive sound.
3. Hydraulic system is unable to work normally. Once the hydraulic oil is mixed with air, the oil compressing rate will increase largely and the high stiffness of oil itself will reduce greatly, resulting in miswork of performers, failure of automatic control and creeping of working bodies, destroying work stability and seriously harming system’s work reliability. Even air leakage may happen and endanger human safety.
4. Cavitation Erosion: when the bubbles generated from the oil in the low pressure area are carried to high pressure area, they will collapse suddenly and re-condense to fluid, causing the partial area forms vacuum. The surrounding oil flows toward to the collapsing center at very high speed, producing larger partial impact force to the wall surface. The instant pressure can be up to hundreds of or even thousands of barometric pressure. When a great deal of bubbles collapse, the metal side wall will suffer exhausted damage from repeated fierce shocking, causing the erosion of solid wall surface. The erosion caused by cavitation to the surface of solid materials is called cavitation erosion, which is very harmful to system.
5. Speed up hydraulic pollution. The bubble or foam in oil is called intangible contaminant, which is seriously harmful to hydraulic. It makes the oil’s stiffness decreases, volume efficiency reduces and system’s reliability decreases. When the bubbles in the oil is compressed instantly or destroyed, the state similar to adiabatic compression will increase the bubble temperature sharply and then cause increase of oil temperature, resulting in the damage of various additives in the oil, thus, producing free carbon, acid substances and daub sediments, causing oil turns black, accelerating oil degradation and meanwhile causing the metal produces chemical corrosion. Besides, higher oil temperature will cause oil oxidation, decrease oil lubrication performance and speed up aging of seal elements.

Harmfulness of Impurities in the Oil (all suspended solids as well as their sediments which are not dissolved in gasoline and benzene)

1. It destroys oil film and blocks the formation of oil wedge. Solid contact occurs between the friction surfaces of moving parts, causing lubrication failure.
2. The galling and damage fitting on the surfaces decrease degree of finish and fit quality. When it is serious, due to continuous and rapid expansion of damaged surfaces the moving parts bite together, causing damage of machine parts, parking accidents and product abandonment.
3. It speeds up machine parts wear, destroys fit property and precision, enlarges space and reduces transmission accuracy. In the lubricating system inner leakage is increased. Insufficient oil supply decreases system pressure, affecting mechanical efficiency and service life or causing serious problem that the machine cannot work normally the lubrication loses efficiency.
4. It stuffs or blocks oil flow in the filtering devices or running pipelines, causing insufficiency and failure of lubrication and cooling system, bringing sharp temperature rise of friction surfaces and accelerating aging of the oil.
Previous    Next
任你躁久久久久久妇女AV | 国产精品无码无卡A级毛片 婷婷伊人久久大香线蕉AV | 不卡无码在线一区二区三区 | 无码Aⅴ免费一区二区三区 欧产国产日产精品精品亚洲 | 777精品久无码人妻蜜桃 | 内射无套在线观看高清完整免费 | AV无码天堂一区二区三区 | 精品人妻大白屁股白浆优播 | 正在播放国产多p交换视频 国产一在线精品一区在线观看 | 成人国产精品动漫欧美一区 | 久久精品国产亚洲AV忘忧草18 | 日欧137片内射在线视频播放 | 亚洲一区二区三区久久久久久 | 国产高清 精品软件丝 | 国产又黄又爽胸又大免费视频 | 国产一级AV片在线观看 | 亚洲AV成人无码网站天堂久久 | 欧洲v亚洲v日产韩国综合 | 日韩欧美精品一区二区三区 | 精品国产又硬又粗又大又爽 | 亚洲综合动漫一区二区蜜桃 | 国内伊人久久久久久网站视频 | 中文字幕人妻一区二区在线 | 一区二区三区国产亚洲综合 | 亚洲熟妇AV乱码在线观看 | 欧美性猛交XXXX乱大交极品 | 日韩精品欧美精品亚洲系列 | 免费国产va在线观看视频 | 无套内射在线无码播放 | 日韩激情精品一区二区三区 | 亚洲无码一区二区三区四区 | 99蜜臀无码人妻久久精品 | 国产剧情av巨作精品原创 | 久久精品一区二区三区日韩 | 无码专区中文字幕无码 | 久久国产乱子精品免费女 | 一区二区三区四区在线 | 国产精品亚洲а∨天堂2021 | 国产私拍福利在线观看视频 | 亚洲欧美色中文字幕在线 | 精品人妻伦一二三区久久 |