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introduction：A power station turbine that uses the steam generated by the heat generated by the fission of atomic nuclei as its working medium(See nuclear power plant)。There are different types and requirements of steam turbine in nuclear power plant according to the different types of nuclear reactor。In a pressurized water reactor﹑Boiling-water reactor﹑In nuclear power plants such as heavy water reactors and gas cooled reactors﹐The admission pressure is usually used5～7Megapascal saturated steam turbine。Except for boiling water nuclear power plants﹐The working medium steam of the saturated steam turbine in other nuclear power plants does not come into direct contact with the nuclear reactor﹐Basically no radioactive contamination﹐Steam turbine operators do not need special protection。Improved gas-cooled reactors and some new reactors(Such as molten salt breeder reactor﹑fast
2015-02-02 Reading quantity 2904
introduction：Pin joint A detachable connection that uses a pin to unite the connected parts(See picture Conical pin connections and various pins )﹐Small loads can be transferred﹐Sometimes it is also used as a safety part for overload cutting。Another use of the pin is to fix the mutual position of two parts﹐As an important auxiliary part in combined processing and assembly。Marketing standardization﹐Many types。Commonly used are﹕Round pin﹑Taper pin﹑Slot pin and cotter pin, etc。The cylindrical pin is fixed in the hinged pin hole with a small interference﹐If repeated assembly and disassembly, loss of joint fastening and accurate positioning。Tapered pin band1：50Taper of﹐self-latching﹐It is fixed in the hinged pin holes by coning extrusion﹐Caudo
2015-02-02 Reading quantity 2808
introduction：First of all you should be familiar with the design of cold die regulations 1. Drawing product（Ready-to-use parts）drawing. 2. Assembly drawing.. 3. Drawing parts. 4. Write and draw stamping process cards. 5. Write drawing design specification.(At present, the current factory generally does not need to write，Can be omitted。however，You have to，In case I have to write it？). Cold die design steps and requirements Collect the necessary information first：A product or set of products given to you by your boss or client（Ready-to-use parts）Drawing or object、Did I give you a copy of the mold design？This batch
2015-02-02 Reading quantity 2921
introduction： Working principle So-called vacuum drying、Is to dry the material under vacuum conditions，Heat dry，It is the use of vacuum pump for pumping air to dehumidify、Create a vacuum in the working room，The drying rate is accelerated。 peculiarity The boiling point of the material solution decreases under vacuum，The heat transfer driving force of the evaporator is increased，So for a certain amount of heat transfer，Can save the heat transfer surface of the evaporator
2015-02-02 Reading quantity 2809
introduction：1. Use more4Guide post ball mold holder,Punch retaining plate、For discharge plates and concave formwork4Small guide post to direction,Up.、Die holderS55C,Small high-grade mold template with high hardness of light alloy aluminum,convex、The die material is selected according to the material properties of the partsG5,G8andSKD11,The whole block structure is adopted,Machining accuracy is±0.002mm,Cutting edge partRa<0.1mm,After grinding, it is cryogenically treated,HRC59-63. 2. Die block assembly adopts groove opening on die base,Inserts are secured by screws,It is provided with a pulling hole, Easy to disassemble
2015-02-02 Reading quantity 2889
introduction：Cause of clutch slip 1、Clutch compression spring is broken or aged soft,Reduce the pressure of the platen,Friction reduction,The ability to transmit torque is reduced,When the load is slightly increased,The clutch will slip。 2、The clutch clearance is too small。Separate 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，It is used to reduce the friction coefficient in the process of power transmission and keep the center position of the shaft fixed
2015-02-02 Reading quantity 2806
introduction：[Abstract]The influencing factors of flexural rebound are analyzed in this paper，The concrete measures to control flexural rebound are also introduced。 Just as corrugations affect the quality of drawn parts，Springback mainly affects the quality of bending parts，Therefore, the bending rebound and its control are the problems that mold workers have been concerned about。Can be said of any plate plastic deformation，Bounce back is inevitable after unloading，Its just that the bending is a little more prominent。The reason is that there can be several other things：One is when bending deformation、The stress properties of the outer layer are reversed，The rebound direction is the same after unloading，So bend the shape of the piece、Large size variation；The second is
2015-02-02 Reading quantity 2799
introduction： Just finished the interview for the national civil service，And to join the army of Shanghai civil servants to take the exam。lately，In major universities in Shanghai，Theres a bunch of people interviewing around for civil servants“Go to take an imperial examination”Graduate of，It is understood，The least number of applicants will also apply for the national civil service and Shanghai civil service，Others have signed up province by province，Up to four or five provinces。 From Hunan，Tang Shuang, now a masters student in journalism at Jiangxi University, wants to work in Shanghai，But she applied for Hunan、Jiangxi (Province)、Civil servants in three places in Shanghai。Tang said she hopes to become a civil servant in Shanghai，Because there are many classmates in Shanghai，Since the
2015-02-02 Reading quantity 2903
introduction：one、Type of lathe All machine tools use Chinese pinyin letters and numbers，Combine and number according to certain rules，To indicate the type and main specifications of the machine tool。 Lathe typeC6132The meaning is as follows： C——lathe；6——Ordinary lathe group；1——Plain lathe type； 32——The maximum machining diameter is320mm。 Old modelC616The meaning is as follows： C——lathe；6——General lathe；16——Distance from spindle center to bed surface1/10，That is, the center height is1
2015-02-02 Reading quantity 2898
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 selection and use of precautions Bearing selection brief Types of rolling bearings、There are many types and sizes。To enable the mechanical device to perform the desired performance，Choosing the most suitable bearing is crucial。 For selected bearing，Many factors need to be analyzed，From all corners
2015-02-02 Reading quantity 1528
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