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introduction： Recycle natural gas or pure gas through a refrigerator(Like oxygen﹑nitrogen﹑hydrogen﹑Neon and helium, etc)Cryogenic equipment for cooling and condensing into liquid state respectively。methane﹑neon﹑Hydrogen and helium in0.1The condensation temperature at mpa pressure is﹕111.7K﹐27.1K﹐20.4K﹐4.215K。The liquefaction of gases is based on the characteristics of the gas﹑The condensing temperature and service requirements are achieved through the corresponding liquefaction cycle。The typical cycle is a throttling liquefaction cycle﹑Liquefaction cycle with expander﹑Gas chiller cycles and cascade refrigeration cycles(The quality of multitasking﹑Multiple stage precooling cycles)Etc.。
2015-06-04 Reading quantity 2900
introduction：On the silver guide rail in the selection of rail lubricating oil，It is necessary to consider the lubricity of lubricating oil，At the same time, it should also meet the efficiency of the guide rail。The guideway lubricating oil used has good creepability，Wear resistance and other requirements。This paper mainly describes the selection of machine tool guide lubrication
2015-06-04 Reading quantity 58490
introduction：1.rotate： MB2 2.translation： SHIFT+MB2 perhaps MB2 + MB3 3.Zoom： CTRL +MB2 perhaps MB2 + MB1 4.When translating the working coordinate system by holding downALTkey，You can perform precise positioning。 5.Drawing，You can use it in linear dimensionsSHIFT-Drag to create a narrow size。 6. You can double-click on the navigator or palette TAB in the Resource bar，So that they jump out and can be placed separately。 7.As a sketch，Dot line shows its
2015-06-04 Reading quantity 2874
introduction： Lubricants are used on various types of machinery to reduce friction，Body lubricants for protecting machinery and processing parts，Main lubrication、cooling、rust-proof、clean、Sealing and cushioning functions。Lubricating oil accounting for all lubricating materials85%，There are many kinds and brands，Now the world annual consumption is about3800Ten thousand tons。The general requirements for lubricants are： （1） Anti-friction and anti-wear，Area friction resistance to save energy，Reduce wear to extend mechanical life，Improve economic efficiency； （2） cooling，The friction heat is required to be expelled from the machine at any time； （3） Bees，Demand defense
2015-06-04 Reading quantity 1511
introduction：zaireqi reheater reheater A component arranged in the boiler for reheating the exhaust steam from the high pressure or medium pressure cylinder of the turbine to the required temperature。 In order to improve the cycle thermal efficiency of large generator sets，Intermediate reheat cycles are widely used。The main steam from the boiler superheater after work in the high pressure cylinder of the turbine，To be reheated in a reheater to raise the temperature，Then it is sent to the middle pressure cylinder of the steam turbine to continue to expand for work，This is called an intermediate reheat cycle，The cycle efficiency can be relatively improved4～5％。Some large units，After the medium pressure cylinder will be drained again
2015-06-04 Reading quantity 2864
introduction： Its made by powder metallurgy﹑A material with a porous internal structure(Or article)﹐It is generally made of spherical or irregularly shaped metal or alloy powder by forming and sintering﹐Also known as sintered porous material。The material is criss-crossed with pores﹑Interpenetrating porous bodies﹐Usually have30～60％Volume porosity﹐aperture1～100micron。A common metal or alloy is bronze﹑Stainless steel﹑iron﹑nickel﹑titanium﹑tungsten﹑Molybdenum and refractory metallization
2015-06-04 Reading quantity 2881
introduction：Metal corrosion leads to increased maintenance and early replacement of machinery and equipment，Shut down，Moreover, the corrosion of metal products also reduces the accuracy and sensitivity，Affect its use value and even scrap。As everyone knows，bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Theyre precision mechanical parts，High precision and high surface finish are required，And rust will make the shaft
2015-06-04 Reading quantity 1622
introduction：bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The sealing is to make the aligning roller bearing maintain good lubrication conditions and a normal working environment，Give full play to the bearing performance，Extend service life，The rolling bearing must have a suitable seal，To prevent leakage of lubricants and dust、Intrusion of moisture or other filth。SKFshaft
2015-06-04 Reading quantity 1551
introduction： 1、 Low noiseFAGbearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The installation and adjustment can also imitate the grouping method of long-life bearings，The size of fit interference is more consistent，FAGBearing clearance is also more consistent，And we want the fit interference to be a small value within the possible range，In order to ensureFAGThe deformation of bearing raceway is small
2015-06-04 Reading quantity 1658
introduction：Basic structure and classification of injection molding die one、 Basic structure,Classified according to the role of the part: 〈one〉 Gating system The passage that leads the plastic from the injector nozzle to the cavity is called the pouring system，It is by the mainstream，Diversion channel，Inner gate，Cold material hole and other structural composition，By the parts of the pouring sleeve，Drawing rod and so on。 〈two〉 Formed part It is a variety of parts that directly constitute the shape and size of plastic parts，By core（Internal shape of molded plastic parts），cavity（Molded plastic exterior shape），Forming rod，Insert blocks, etc。 〈three〉 Structural part Various parts that make up the structure of a part，
2015-06-04 Reading quantity 2952
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