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introduction：Hydrogenated nitrile butadiene rubber（HNBR）With traditional nitrile rubber（NBR）Compare with，Its molecular structure contains little or no carbon-carbon double bonds（C=C），It not only hasNBROil resistance of、wear-resistant、Low temperature resistance and other properties，It also has better heat resistance to oxygen aging、Ozone resistance、Chemical resistant medium、Good dynamic performance, etc，It is one of the most promising rubber varieties at present，In many ways, it has replaced other special rubber such as fluorine rubber，It has been widely used in automobiles、Oil fields and other industrial areas。Especially for car belts，Has taken up its usage50above。HNBRFirst by GermanyBayerThe company is in
2015-02-06 Reading quantity 2901
introduction：1.Osmosis and osmotic pressure Infiltration is common in nature，For example, put a cucumber in salt water，The cucumber will become smaller due to the loss of water。Infiltration is the process by which the water molecules in the cucumber enter the brine solution。As shown in the figure1As indicated,If you cut a pool of water into two parts with a membrane that only water molecules can penetrate,Inject pure water and salt water to the same height on each side of the diaphragm。After a period of time, it can be found that the level of pure water decreases，And the salt water level rises。The migration of water molecules through this membrane into salt water is called osmosis。Brine level rise is not endless，
2015-02-06 Reading quantity 2820
introduction： Locomotive rolling bearings are introduced[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。]Simple diagnosis and precise diagnosis，Examples of detection are given。 Subject term：Locomotive rolling bearing fault detection 1introduction Bearings are the main components of a locomotive，Especially traction motors、Axle box bearing，Its merit
2015-02-06 Reading quantity 1565
introduction： Materials σb Extrusion ratio 1.25 1.5 2.0 3.0 4.0 5.0 6.0 10.0 Carbon content of steel Quality() 0.1 400 570 745
2015-02-06 Reading quantity 3052
introduction：Improve the overall quality of operators The use of CNC machine tools is more difficult than the use of ordinary machine tools，Because CNC machine tools are typical mechatronics products，It involves a wide range of knowledge，That is, the operator should have a machine、electricity、liquid、Gas and other broader expertise；more，Due to its electrical control systemCNCSystem upgrade、Replacement is faster，If you do not regularly participate in professional theoretical training to learn，You cant master new onesCNCSystem application。Therefore, the quality requirements for operators are very high。For this purpose，CNC operators must be trained，Make it on machine tool principle、property、oiling
2015-02-06 Reading quantity 1570
introduction：The main causes of rust are as follows： 1、Some enterprises are producingNSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe function of the bearing fit is to makeNSKThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(Usually a bearing seat)And rotating part(Usually an axis)Solidify together，Thus, the basic tasks of transferring the load in the rotating state and defining the position of the moving system relative to the stationary system are realized。]The process is not strictly in accordance with the cleaning anti-rust procedures and
2015-02-06 Reading quantity 1468
introduction：one、Degree of automation For a biochemical analyzer，The higher the degree of automation，The stronger the function of the instrument。The degree of automation of the instrument depends on the function of the microprocessor used in the instrument，Depending on the function of the instrument computer，Automatic analyzers can generally be divided into automatic and semi-automatic two kinds。 Fully automatic analyzers are more suitable for large sample sizes，Many laboratory items，Clinical laboratory application in general hospitals with relatively insufficient manpower。And for the sample quantity、It is more appropriate for small hospitals or specialized hospitals with few laboratory items to use semi-automatic analyzers。 two、Analytical efficiency this
2015-02-06 Reading quantity 2790
introduction：Steam temperature and pressure reduction system in parallel with steam turbine。Its main function is﹕ Machine hoisting﹑Coordinate the steam parameters of boiler outlet and turbine inlet during shutdown﹔ Machine hoisting﹑Protect the reheater in case of shutdown or accident﹔ Recovery working medium。Steam is bypassed through the whole turbine﹑The system that leads directly into the condenser is called integral bypass﹔Steam bypass high pressure cylinder is called high pressure bypass﹔Steam bypass in progress﹑The low pressure cylinder is called the middle﹑Low voltage bypass。Common bypass systems are3Kind of(See picture Bypass system diagram )﹕ A system with only integral bypass is called a primary bypass system﹐The advantage is that the system is simple﹑Easy to operate﹐Suitable for reheater without protection
2015-02-06 Reading quantity 2918
introduction：Boiling heat transfer: The process of heat transfer when a liquid boils on a heating surface﹐It is a two-phase flow heat transfer with phase transition characteristics。When heating surface temperatureT WExceeding the saturation temperature of the liquidT SAnd reaches a certain value﹐The liquid forms bubbles at certain points on the heating surface。These points are called vaporization cores﹐It usually appears in small pits on heated surfaces。The bubbles form and grow﹑detach﹑Surface。The steam bubble absorbs a large amount of latent heat of vaporization during its formation and growth﹐The breaking off and rising motion of the bubble produce a violent disturbance﹐Therefore, boiling heat transfer is much stronger than convective heat transfer in a single phase fluid。After the bubble is removed from the heating surface﹐If the liquid has not reached
2015-02-06 Reading quantity 2858
introduction： PLCwithDCSincomparability，PLCYes controller，Its an isolated product，whileDCSYes system。butPLCCan relate toDCSComparison of control stations，PLCThe cycle of the cycle in10Milliseconds or so，whileDCSControl station500Milliseconds or so，PLCOpenness is better，Its ability to work independently as a product is stronger。 —— OMRONcorporation Lu Bin DCSIts a system that includes the upper software、Network and controller，whilePLCJust a controller.，You need to be on top to build a systemSCADASystems and networks connected to them。rightPID
2015-02-06 Reading quantity 2908
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