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introduction：1.1Basic principles of programmable controller PLCIts based on electronic computers，And suitable for industrial field work electrical controller。It originates from the relay control unit，But its not like a relay，Control is achieved through the physical process of the circuit，And mainly rely on running storage inPLCIn-memory program，The control is realized by transforming the information in and out。 PLCcomputer-based，But its not the same as a normal computer。Universal computer to carry out in - out information transformation，Just think about the message itself，Information in and out，As long as the human-machine interface is good。whilePLCBut also to consider
2015-04-08 Reading quantity 2984
introduction： Rated capacity／Maximum capacity／t Inside diameter of furnace shell／m Transformer rating／MVA Graphite electrode diameter／mm 1class 2class 3class 0.6／1 1.6 0.63 (150),100 1.5／2.5 2.1 1.25 (200),150
2015-04-08 Reading quantity 2935
introduction： Vertical machining center The main user level of vertical machining center is,Led by the bullish auto parts industry，And mold、aeroplane、Medical equipment、IT、Optical equipment and other industries。In the aircraft manufacturing industry, most of the workpiece is multi-variety、Small batch products，Therefore, there is a potential demand for vertical machining centers based on five-axis processing machines。Future electronic parts、Precision branch parts、Industries such as semiconductor molds also have demand potential。 Manufacturers face an expected expansion in demand for aircraft、mould、Semiconductor and other industries，The development of a five-axis processing machine is under way。
2015-04-08 Reading quantity 2804
introduction： The process range of universal cylindrical grinding machine is wide，Internal and external cylinders can be ground、Inner and outer cone、Face scheduling。But its production efficiency is low，Suitable for single piece small batch production。 The main difference between ordinary cylindrical grinding machine and universal cylindrical grinding machine in structure is：The head frame and grinding wheel frame of ordinary cylindrical grinding machine can not be adjusted Angle around its vertical axis，The spindle of the head frame cannot be turned，No internal grinding tools。therefore，The process range of ordinary cylindrical grinding machine is narrow，Only the outer cylinder and the outer cone with smaller taper can be ground。However, the structure of its main components is less hierarchical，Good rigidity，Large grinding amounts can be used，So productivity is higher
2015-04-08 Reading quantity 1444
introduction：1.Centripetal joint 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。] （1）GE…EType single outer ring，No lubricating tank。Can withstand radial loads and small axial loads in either direction。 （2）GE…ESType single seam outer ring，There is a lubricating oil tank。Can withstand radial loads and any direction
2015-04-08 Reading quantity 1472
introduction：Worm gear is a kind of mesh with the worm、Gear with special tooth shape。The cutting of worm gear teeth is generally completed by hobbing machine，There are two main methods of hobbing and cutting teeth with flying knives。When making precision worm gears，Shaving can be done after hobbing or cutting、Finishing process such as gear honing or grinding。 The gear hobbing adopts worm gear hob with the same basic parameters as the working worm，According to the principle of generative method(See gear machining)Cut out the teeth（figure1 [Machining worm gear by rolling and cutting]）。If the radial feed method is used，Then the hob and the workpiece pressZ2/Z1The gear ratio of（Z1Is the number of thread heads of working worm,Z2The worm gear teeth
2015-04-08 Reading quantity 2785
introduction：self-lubricatingTIMKENbearing[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。]Service temperature width，Sufficient content of solid lubricating materials，Uniform release，It has good self-lubrication property and bite property，Can effectively protect the journal，Achieve the purpose of lasting use。Suitable for use at high temperatures、Low speed、Heavy load、dusty、Water flushing and shock vibrating rings
2015-04-08 Reading quantity 1438
introduction： Vibrating pairSKFbearing[SKFbearing:SKFThe full name is“Svenska Kullager-Fabriken”The Chinese transliterated name is“SKF”；SKFThe group is headquartered in Gothenburg, Sweden，Is a leader in bearing technology and manufacturing。SKFBearings can be divided into sliding according to different specific structures and similarities and differences in working propertiesSKFBearing and rollingSKFbearing]The damage can be said to be quite sensitive，Peel off、impression、corrosion、crack、Wear and tear will be thereSKFbearing[SKFbearing:SKFThe full name is
2015-04-08 Reading quantity 1436
introduction：1．thermoplastic （1）polythene（Polyethylene，PE） Polyethylene plastic is the largest variety in the plastic industry。According to the pressure used in polymerization can be divided into high pressure、Three kinds of medium and low pressure。The low pressure polyethylene polymer chain has fewer branch chains，Relative molecular mass、High crystallinity and density，It is also called high-density polyethylene（HDPE），So its hard.、wear-resistant、Corrosion resistance、Good heat resistance and electrical insulation。High pressure polyethylene polymers have many branched chains，So the relative molecular mass is small，Crystallinity and density are low，It is also called low density polyethylene（LDPE），and
2015-04-08 Reading quantity 2890
introduction： Raceway noise is due toFAGbearing[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。]When rotating, the rolling element rolls in the raceway and generates a smooth and continuous noise，It attracts attention only when its sound pressure level or tone is extremely high。In fact, the sound energy stimulated by raceway sound is limited，As in normal circumstances，Of high quality620
2015-04-08 Reading quantity 1535
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