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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 1574
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 3059
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 1579
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 1471
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 2793
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 2927
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 2862
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 2911
introduction：one、 Must obey before work： 1、Read the shift records carefully，Solve problems left over from the last shift。 2、Remove obstacles that impede the normal operation of the equipment。 3、According to the lubrication card，Lubricate the equipment。 4、Check whether the fasteners in key parts of the device are tight，In case of loosening，Must be secured。 5、Check that all door handles are in the stationary position。 6、Unscrew the compressed air total cut，Carry out no-load test on the equipment； a、 Check that the operation of the various institutions is normal。 b、 Check the pipes of each valve for air leakage； c、 Use a coin or a pad
2015-02-06 Reading quantity 2936
introduction： A systematic analysis method for uncertain decision problems。The aim is to improve the decision-making process﹐From a range of alternatives, find a suitable solution that meets certain objectives。Decision analysis has four basic elements﹕option﹑ending(Sometimes called consequences)﹑Utility and preference。 Development profile As early as1738years﹐Bernoulli has put forward the concept of utility in decision analysis。from1763Since Bayes published conditional probability, there has been the germ of statistical inference theory。1815Laplace took it to a new level。Statistical inference theory is actually decision theory in the case of risk。19
2015-02-06 Reading quantity 2809
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