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introduction：Differential equations of motion obtained by applying Newtons second law to invisibles of fluid。Eulers equation is the most important fundamental equation in invisiless fluid dynamics,Very widely used。1755years,Swiss mathematiciansL.Eulers presence《General principles of fluid motion》This equation was first proposed in the book。The general form of Eulers equation is [544-03]ShizhongD[vc]/D[t]Fluid acceleration;[fc]Is the volume force on the fluid per unit mass，usual[fc]＝[gc]（[gc]Acceleration of gravity）；-[san]/[p]Is the pressure on the surface of the fluid per unit mass
2015-03-03 Reading quantity 2974
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。]Installation of case： 1、Normal form Several methods for mounting bearing boxes with clasp rings and fixing plates。 Mounting bearings with positioning screws will cause deformation of the bearing jacket，Should try to avoid。 2
2015-03-03 Reading quantity 1546
introduction： Standard number Standard Chinese name Standard English name DIN 3269-1
2015-03-03 Reading quantity 2970
introduction： TIMKENbearing[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。]Corrosion is mainly divided into metal corrosion and human hand sweat，Metal corrosion accounts for the vast majority，In many cases, its unavoidable。And sweaty hands can also cause itTIMKENBearing corrosion，Mainly sweat is produced on its surface when it comes into contact
2015-03-03 Reading quantity 1463
introduction： Aluminum alloy die casting，Aluminum inclusive、magnesium、Zinc alloy series die casting products，Widely used in automobiles、telegraphy、motorcycle、Household appliance industry。Die casting release agent for aluminum alloy，It is an additive that must be used in the production process。Due to the volume size of the product is different、The degree of structural complexity is different、The post-processing requirements of the products are different，The requirements for release agents also vary。 The zinc alloy material is heated and melted(Aluminum melting point660.4℃)，The liquid is injected into the mold cavity under high pressure，And in a short time to open the mold top piece out of the mold。In order to ensure the smooth release of products，Release agent must be sprayed on the surface of the mold cavity before injection。
2015-03-03 Reading quantity 2942
introduction：A vacuum pump with offset impeller rotating in the pump chamber to make the studio volume change periodically to achieve air extraction。Its workshop consists of a rotating liquid ring and an impeller﹐Its structure and working principle are similar to that of liquid ring compressor。When working, the suction port is connected to the vacuumed container。If the pump cavity is filled with water, it is called water ring vacuum pump。Water ring vacuum pump has simple structure﹐Easy to manufacture﹐Work reliably﹐Easy to use﹐Strong durability﹐Corrosivity can be removed﹑Dusty gas, gas and water mixture。The pumped gas temperature is-20 40℃Be appropriate。The circulating water should not contain impurities。The pumping rate range of the water ring vacuum pump is0.25～500meter3/Hour (s)﹔
2015-03-03 Reading quantity 2809
introduction：A system for regulating and monitoring steam turbines。Steam turbine is one of the main equipment of thermal power plant﹐Large in size﹑Spin fast。When it is transferred from the static state of normal temperature and pressure to high temperature and high pressure high-speed operation﹐A slight error in operation or control﹐It could lead to a major accident﹐Therefore, the automatic control of steam turbine is of great significance。Steam turbine control system includes automatic start and stop﹑Steady speed or speed regulation﹑Parameter detection and equipment protection systems。The content and complexity of the control system varies according to the use and capacity of the unit。 Automatic start-stop system It is necessary to put a steam turbine in the static state of normal temperature and pressure into grid operation﹐First to get up
2015-03-03 Reading quantity 2927
introduction： milling Cutting with a rotary milling cutter as a tool。Milling is generally carried out on a milling or boring machine，Machinable surface、groove、Various forms(spline、Gear and thread)And mold special shape surface, etc。The characteristics of milling are：①The teeth of the milling cutter participate in intermittent cutting periodically；②The cutting thickness of each tool tooth during the cutting process is changed。figure1It is several common milling processing methods。 figure1 Several common milling methods cutting speedv(meter/points)Is the circular speed of the milling cutter edge。Milling feed has3Type representation：①Feed per minute
2015-03-03 Reading quantity 2812
introduction： 1 FZ/T 90060.1－2005《Textile machinery Product drawings and design documents The first1section：General rules》(replaceFZ/t90060-1995) This part specifies the textile machinery product drawings and design documents，includeCADDefinitions of terms related to diagrams and design documents、Classification and signing rules, etc。 This part applies to the management of product drawings and design documents in the textile machinery industry。The management of other product drawings and design documents can also be referred to。 2 FZ/T 90060.2－2005《Textile machinery Product drawing
2015-03-03 Reading quantity 2788
introduction： one.Causes of wave rhymes 1As the resin began to cool and solidify, it entered the mold cavity 2Mold temperature is too low two.Related knowledge： 1At the nozzle，The resin cooled in the edge enters the mold cavity in a semi-cured state，Contact with the mold and cure immediately，Then it enters the deep cavity to form a wave flow state。 2Due to the different thickness of the product is also easy to produce wave flow。 three.solution 1immediately：Increase cylinder temperature，Increase mold temperature。 2short-term
2015-03-03 Reading quantity 2797
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