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introduction：The sun shines on the semiconductorp-nknot，Forming new holes-Electron pair，inp-nUnder the action of junction electric field，Hole supplynRegional flow directionparea，Electron distributionpRegional flow directionnarea，When the circuit is switched on, an electric current is formed。This is how photoelectric effect solar cells work。 one、Solar power generation There are two kinds of solar power generation，One is light—hot—Electrical conversion mode，The other is light—Electric direct conversion mode。 （1）light—hot—The electric conversion method uses the heat generated by solar radiation to generate electricity，Generally, the heat energy absorbed by the solar collector is converted into steam of the working medium，And then drive the steam turbine to generate electricity。
2015-01-04 Reading quantity 2794
introduction： Drill press with vertical spindle and fixed center position﹐Short vertical drill(figure1 Vertical drilling machine)。It is often used in machinery manufacturing and repair factory processing﹑Holes for small workpieces。 Before processing﹐The position of the workpiece on the workbench must be adjusted first﹐Align the center line of the machined hole with the axis of the tool。Processing time﹐The workpiece is fixed﹐The spindle rotates in the sleeve and feeds axially with the sleeve。Table and headstock can be adjusted along column guide rails﹐To accommodate workpieces of different heights。 Vertical drill has square column vertical drill and round
2015-01-04 Reading quantity 2802
introduction： For tensile parts, People are used to pre-cut or blanking the sheet to a certain shape,restretch。For tension parts with irregular flanges, After stretching, the cutting process must be added to ensure the shape of the workpiece, If the workpiece has flatness requirements,We need to add more shaping,This increases the number of processes。Positioning error caused by the number of processes,The quality of the product may be affected, And this design method can not avoid the hand into the dangerous area of the die,Its not safe to go there.。 1 Process analysis 2 Mold structure and working process
2015-01-04 Reading quantity 2904
introduction：IKOBearings are precision parts，Therefore, it requires considerable caution when using，The change is the use of high-performanceIKObearing，If used improperly，Nor can it achieve the expected performance effect，And easy to make bearings[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。]breakdown。therefore，The use of forklift bearing should pay attention to the following matters： one
2015-01-04 Reading quantity 1573
introduction：IKOWhether the bearings are installed correctly，Affect the accuracy、Life span、property。therefore，Design and assembly department forIKOThe installation of bearings should be fully studied。It is expected to be installed according to operating standards。The operating standard items are usually as follows： （1）cleanseIKOBearing andIKObearing[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。
2015-01-04 Reading quantity 1547
introduction： The first is to pay attention to the measurement of lubricating oil。When the electromagnetic clutch is working，Its not just the power supply，It also relies on lubricating oil。When theres more oil，The transport of the clutch will be somewhat disturbed，And when there is less lubricating oil in the clutch，The movement of the clutch will also be disturbed。So always check the measurement of lubricating oil，Maintain equality。 The second is to pay attention to the wear of the clutch。Because the working principle of the electromagnetic clutch is the combination of power，Cut apart when the power is off。So a long time of combination and separation，There will be some wear on the clutch，
2015-01-04 Reading quantity 2801
introduction：In a modern enterprise，The use of compressed air is becoming more and more common，There are two common drying devices: adsorption drying device and frozen drying machine。 The effective gas supply of the refrigerated dryer can be reached100％，however，Due to the constraints of the working principle，The minimum gas dew point of the refrigerated dryer can only be reached3℃（Pressure dew point）around，And it is greatly affected by the intake air temperature，Every increase in intake temperature5℃，Cooling efficiency will decrease30％，The gas supply dew point will increase significantly。meanwhile，Refrigeration dryers must consume a certain amount of electricity and cooling water。 Adsorption drying devices are mainly：Regenerative dry without heat
2015-01-04 Reading quantity 2899
introduction： 1 GB/T 2-1985 fastener The end of the part with external thread Fasteners--Ends of parts with external thread 2 GB/T 8-1988 Square head bolt Clevel Square head bolts--Product grade C 3 GB/T 10-1988 Countersunk head square neck bolt Flat countersunk square neck bolts 4 GB
2015-01-04 Reading quantity 2886
introduction： one、Significance of experimental design Experimental design is a part of research methods and procedures in a scientific research plan。In medical research work，Regardless of laboratory study、Clinical efficacy observation or field investigation，In formulating the research plan，Should be based on the purpose of the experiment and regulations，Combined with the requirements of statistics，For the whole process of the experiment，Carefully consider the design of the experiment。A thorough and perfect experimental design，Can arrange various experimental factors reasonably，Strictly control experimental error，Thus using less manpower、Material resources and time，Get the most out of abundance and reliability
2015-01-04 Reading quantity 2813
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 feature of... Rolling bearings compared with plain bearings,Have the following advantages: 1．The friction coefficient of rolling bearings is smaller than that of plain bearings,High transmission efficiency。The friction coefficient of the general plain bearing is0.08-0.12,The friction coefficient of rolling bearings is only0.
2015-01-04 Reading quantity 1419
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