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introduction：A polymer of basic building blocks in steel and cast iron as seen under a metallographic or electron microscope。The surface of the specimen should be smoothed and polished when viewed with a metallographic microscope，Use a suitable corrosive agent to slightly erode。When viewed with an electron microscope，More complex sample preparation is required。The maximum magnification of metallographic microscope can be reached2500times，Electron microscopes can magnify hundreds of thousands of times（See optical metallographic examination）。Both steel and cast iron are alloys formed by adding carbon and other alloying elements to iron,among,The carbon content is0.77％The steel is called eutectoid steel；Carbon content is less than0.77％The steel is called hypoeutectoid steel；carbonaceous
2015-02-24 Reading quantity 2882
introduction： Consequences of improper use of the clutch 1、Always check the free travel of the clutch pedal and other clutch components，Keep the clutch in good technical condition。 2、The clutch pressure plate and clutch disc should be flat、Complete separation；The free travel of the clutch pedal shall comply with the regulations（What kind of car are you talking about，Generally in8---12mm）。 、At the beginning，Make sure you use a low gear（1block）start，Especially heavy-duty vehicles，Under heavy load，If the gear is a little higher，
2015-02-24 Reading quantity 2794
introduction：Rolling 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 clearance is an important indicator，Direct impactSKFbearing[SKFbearing:SKFThe full name is“Svenska Kullager-Fabriken”The Chinese transliterated name is“SKF”；SKFThe group is headquartered in Gothenburg, Sweden，
2015-02-24 Reading quantity 1617
introduction： Working principle QGSeries dryer，Adapt to more materials，In addition to the materials mentioned in the basic type，In addition：methaqualone、A.B.CintermediateA.B.SResin,A.S.C、White carbon black、Phenylpyrazolone、Tea meal、Oxalic acid catalyst、acceleratorm.d.m、catalith、Precipitated carbon powder、p-acetylaminobenzenesulfonamide、P-amino-salicylic acid、Dormato、Terephthalic acid、diethylaniline、Titanium dioxide、Activated carbon、Sodium fluorosilicate、Fluorspar deposits、By-product thiamine、Silica gel powder、Synthetic resin、Calcium carbonate、Polypropylene resin、
2015-02-24 Reading quantity 2786
introduction： Steering gear is also known as steering machine、Steering machine，It is the most important component of the steering system。What it does is：Increase the force transmitted by the steering disk to the steering transmission mechanism and change the direction of force transmission。 Full hydraulic steering gear is widely used in vehicle steering and Marine hydraulic steering gear。Through it, the driver can achieve greater steering force control with less steering force，And it is performance-safe、reliable、maneuverability、portability。Steering is fully hydraulic，This means that there is no mechanical connection between the steering column and the steering wheel，Between the steering gear and the steering cylinder is a hydraulic pipe or hose link。Dangzhuan
2015-02-24 Reading quantity 2785
introduction：qiche zaosheng Vehicle noise noise of motor vehicle Cars are the main noise sources that pollute the environment near modern cities and highways。Car noise(See mechanical noise)Air intake from the engine、venting、Valve mechanism、Uneven burning、Vibration of cylinder wall、Friction and other vibrations between the tire and the ground，As well as car brakes and sound signals。Many countries have set noise limits for cars under specified conditions。Chinas urban motor vehicle noise regulations are close to those of the European Economic Community countries,sedan
2015-02-24 Reading quantity 2780
introduction：dianzishu jiagong Electron beam machining electron beam machining The material is melted by the heat energy generated when the electron beam with high power density hits the workpiece、Special processing method of gasification,For shortEBM。Electron beam machining was done by German scientistsK.H.Steigerwalter Yu1948invented。 The basic principle of electron beam machining is：Electrons emitted from a hot filament cathode in a vacuum,At high voltage(30～200Kilovolt (kV))The action is accelerated
2015-02-24 Reading quantity 2776
introduction：A pump specially designed for metering and conveying liquids。The vast majority of metering pumps use the structure of plunger pump and diaphragm pump（See reciprocating pump），Also useful gear pump structure，Because they can maintain a constant flow independent of the discharge pressure。Metering pumps have two kinds of flow adjustable and non-adjustable，The former has wider applicability。The flow rate is mainly regulated by changing the stroke length，For example, change the crank radius、The position of the rear dead center and the clearance at the connection between the plunger rod and the crosshead when the plunger returns，Flow can also be adjusted by changing the number of reciprocations or using both methods。Although the stroke length can be adjusted from zero to maximum，But in order to ensure the accuracy of measurement,generally
2015-02-24 Reading quantity 2790
introduction：1 、A layer of clean mechanical oil should be applied to the surface in contact with the seal during installation，So that it can be installed smoothly； 2、The sealing cavity of the device should be kept clean during installation，Seal parts should be cleaned，Keep the seal face intact，Prevent impurities and dust from entering the sealed part； 3、Do not knock or touch during installation，So as not to make the mechanical seal pay damage and cause seal failure； 4、The force of the rotating shaft of the equipment runs out≤0.04millimeter，Axial channeling momentum must not be greater than0.1millimeter； 5、When installing the static ring gland，The screws must be tightened evenly，Ensure static ring end face and shaft
2015-02-24 Reading quantity 1539
introduction：luoganbeng Screw pump screw pump A rotary pump that depends on the volume change and movement of the meshing space formed by the pump body and the screw to transport liquid or pressurize it(Sight-seeing pump)。Screw pump is divided into single screw pump according to the number of screws、Double screw pump and three screw pump, etc。figure[Double screw pump]It is a double screw pump。When the active screw rotates，Drive the driven screw with which it engages to rotate，The volume of the screw meshing space at one end of the suction chamber gradually increases，Pressure reduction。The liquid enters the meshing space volume under the action of pressure difference。When the volume is increased to the maximum to form a sealed cavity，The liquid is in one
2015-02-24 Reading quantity 2780
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