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introduction： 1、Why is the two-seat valve easy to oscillate when working with small opening？ For a single core，When the medium is open flow type，Good valve stability；When the medium is fluid closed type，The stability of the valve is poor。The two-seat valve has two spool，Lower spool in flow closure，Upper spool in open flow，In this way，Working at a small opening，The flow-closed spool is easy to cause vibration of the valve，This is why two-seat valves cannot be used for small opening operations。 2、Why cant double seal valves be used as shut-off valves？ The advantage of the two-seat valve spool is the force balance structure，Large differential pressure allowed，And its salient drawback is
2015-03-24 Reading quantity 2911
introduction：Linear bearing[Linear bearing:Metal linear bearing is a linear motion system produced at a low cost，For use with infinite stroke and cylindrical shaft。Linear bearings are used in conjunction with quenched linear drive shafts。A system of infinite linear motion。Load the ball and quench the drive shaft because it is point contact，Less allowable load，But when moving in a straight line，Minimum frictional resistance，High precision，Fast movement。]The technical maintenance period is determined. The technical status of the machinery and its parts will gradually deteriorate during use，As a result, reliability deteriorates、Partial or total loss of ability to work。In order to make the machinery maintain good technical performance and high reliability
2015-03-24 Reading quantity 1575
introduction：A compressor that compresses and transports gas by reciprocating motion in the cylinder through a piston or diaphragm。Reciprocating compressors include reciprocating piston compressors﹑Free piston compressor and diaphragm compressor 3class。(See color diagram Reciprocating air compressor )
2015-03-24 Reading quantity 2808
introduction： Field-effect transistor(FET)Field effect tube for short，It is a voltage controlled semiconductor device，Has high input resistance（108～109Ω）、Low noise、Low power consumption、There was no secondary breakdown、Wide safe working area and other advantages，It has become a strong competitor of bipolar transistors and power transistors。 Fet junction type、Two types of insulated gate。Junction FET（JFET）Because there are twoPNGet its name from，Insulated gate type FET（JGFET）It is named because the gate is completely insulated from the other electrodes。Currently in an insulated gate type FET，Apply most
2015-03-24 Reading quantity 2968
introduction： one、Common method of measuring straightness error of guide rail 1.Flat rule lapping method 2.Flat rule drawing method 3.Feeler measuring method 4.Level measuring method two、Common method of measuring the parallelism error of guide rail Basic parts of mechanical equipment such as the bed、Slide seat，It is generally composed of more than two guide rail surfaces。Not only should each guide rail meet the straightness requirements，The parallelism between several guides should also be met。There are three common methods for measuring the parallelism error between guide rails。
2015-03-23 Reading quantity 1605
introduction：Fast machining of the inner cavity and shape of complex workpieces，This can only be achieved with laser cutting。Deformation machining、stamping、Blanking and threading constitute a complex sheet metal part。Trumatic3000The laser stamping machine combines the two advantages of laser technology and sheet metal processing machines，The use of newly developed hydraulic punch and diffusion coolingTCF－1V-laser head。Laser stamping compound machining machine can complete all thicknesses in4mmComposite processing of inner metal sheet。For those companies that need to use composite processing technology to produce complex sheet metal parts with high quality and low cost，Laser stamping
2015-03-23 Reading quantity 2987
introduction： 1 Manufacturing technology and its development characteristics Manufacturing technology is the general term for a series of technologies and equipment used to make raw materials into products that people want，It is an integration of various technologies covering the entire manufacturing process。In a broad sense，It includes design techniques、Processing and manufacturing technology、Management technology and other three categories。Design technology refers to development、The way products are designed；Processing and manufacturing technology refers to the production equipment and methods used to process raw materials into designed products；Management technology refers to how to produce the materials required for manufacturing products、equipment、manpower、fund、Source of energy、Information and other resources efficiently group
2015-03-23 Reading quantity 2826
introduction：1.Dimensional schemedimensionplan Included 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。]A system or table of dimensions。 2.Bearing seriesbearingseries A group of specific types of rolling bearings，Has a gradually increasing size，In most cases
2015-03-23 Reading quantity 1475
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 chemical composition of steel is mainly carbon、chromium、silicon、manganese、nickel、molybdenum、Vanadium et al。 a Carbon effect Except for carburizing steel，General bearing steel carbon content in0.95—1.15%，It is a hypereutectoid component。This can be obtained after quenching and low temperature tempering
2015-03-23 Reading quantity 1514
introduction：The essence of shearing in orientation injection molding is to apply dynamic pressure to the melt through the gate，Vibratory shear flow is generated in the polymer melt in the mold cavity，Under its action, molecular chains or fibers in different melt layers produce orientation and freeze in the product，Thus controlling the internal structure and micro-morphology of the product，To achieve the purpose of controlling the mechanical properties and appearance quality of the product。There are two ways to introduce vibration into the mold cavity: screw and auxiliary device。 1）Screw vibration The working principle of screw vibration is to provide pulsating oil pressure to the injection cylinder，Make the injection screw produce reciprocating movement to achieve vibration，The vibration produced by the injection screw acts on
2015-03-23 Reading quantity 2808
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