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introduction： Special shaped tube with one end closed﹐When different pressures are applied inside and outside the tube﹐Deformation occurs within its elastic limit。The spring tube is a pressure detection component in the pressure measuring instrument。It is made of elastic material﹑Bend into CThe shape﹑Spiral and coil spring shaped hollow pipe。The earliest spring tube bent intoCThe shape﹐Because the FrenchE.Borden invented it﹐It is also called Bourdon tube﹐It is still widely used in modern times。Its free end is movable﹐Open end fixation。A fluid passes through the pipe﹐Under fluid pressure﹐The spring tube is deformed﹐The free end generates linear or angular displacement。The measuring range of the spring tube can be from tens of kpa to
2015-02-21 Reading quantity 2795
introduction：Grab with a fork or skewer、Handling and stacking or accessing unit cargo from high shelves（See unitized transport）Special crane。Its a kind of storage equipment（See Material handling machinery），It is divided into bridge type stacking crane and roadway type stacking crane（Also known as roadway crane）Two kinds of。 The bridge stacking crane is developed on the basis of the bridge crane combined with the characteristics of forklift（figure1 [Overhead stacker crane]）。There are lifting forks on rigid posts that hang down from the trolley，The column can be rotated around the vertical center line，So the shelf between the need for roadway width than forklift
2015-02-21 Reading quantity 2796
introduction： The molecular formula isB4C﹐Melting point is2350℃﹐Hardness lower than diamond, etc﹐Higher than corundum and silicon carbide﹐Commonly used as an abrasive。Industrial boron carbide is produced by reducing boric acid with carbon materials in electric arc furnaces or resistance furnaces﹐Dark gray to black powder with metallic luster﹐containingB4C94％above﹐The others are free boron﹑Free carbon and small amountFe﹑Si﹑Al2O3﹑CaO。Boron carbide as an abrasive﹐Used for grinding and polishing cemented carbide﹑Gemstones and other precision parts。Boron carbide can also be used as a sandblast nozzle﹑filter﹑Chemical ware﹑Trimming tool﹑gauge﹑Probe and die
2015-02-21 Reading quantity 2780
introduction： Abstract：Geothermal heat pump in addition to the characteristics of environmental protection，It has obvious energy-saving advantages。This paper mainly introduces the operating cost analysis and management mode of geothermal heat pump，The geothermal heat pump and the current heating method are discussed（Central boiler room heating、Heat supply in thermal power plant、Gas boiler room heating、Household gas heating），One-off investment、The operating cost is analyzed and compared。 keyword：Circulating pump pump operating costs1、Heat pump operating cost Geothermal heat pump in addition to the characteristics of environmental protection，It has obvious energy-saving advantages，Next, the geothermal heat pump is combined with the current heating method（Central boiler room heating、hot
2015-02-21 Reading quantity 2900
introduction： The necessity and key point of mold maintenance management Even if the size of the shaped product is changed，Adjust forming condition，It can still often be found at the scene「Rough edges and short shots keep coming」The situation of，And this is the main reason that affects the quality of the formed products(Forming pressure、hot、Mold loss, etc)If...，When the forming conditions can be changed temporarily，And cant improve。 The original text of the maintenance is「maintain」，(It is a means of maintaining the originally set state)meaning。 therefore，It must be designed to allow for preventive maintenance，And the mold is this
2015-02-21 Reading quantity 2797
introduction： Newly built﹑Planning for the expansion or reconstruction of machinery plants﹑Demonstrate and compile a set of design documents。Factory design is a comprehensive design work which combines technology and economy。Plant design in a broad sense also includes investment decisions for construction projects。 Design program Plant design usually includes pre-design work﹑Preliminary design and construction drawing design3stage。 Pre-design work﹕Including feasibility study﹑Site selection and design assignment preparation。The design specification shall be prepared by the competent department of the construction project﹐Its purpose is based on feasibility
2015-02-21 Reading quantity 2796
introduction：The main mechanism of ultrasonic cleaning is ultrasonic cavitation．The strength and acoustic parameters of ultrasonic cavitation、The physical and chemical properties of the cleaning solution are related to the environmental conditions，Therefore, in order to obtain a good cleaning effect, appropriate acoustic parameters and cleaning fluid must be selected。 Choice of sound intensity or sound pressure Negative pressure occurs in the cleaning solution only when the amplitude of the alternating sound pressure exceeds the static pressure of the liquid。The negative pressure must exceed the strength of the liquid to produce cavitation。The lowest sound intensity or amplitude of sound pressure that causes the liquid to cavitation is called the cavitation threshold。Various liquids have different cavitation thresholds，The sound intensity in the ultrasonic cleaning tank must be higher than the cavitation threshold to produce ultrasonic cavitation。towards
2015-02-21 Reading quantity 1455
introduction：Abstract：This paper discusses the importance of energy saving and environmental protection21The significance of the development of the automobile industry in the century，introduced25In recent years, the research and development of multistage gear oil and its application effect。finally、The author starts from the perspective of sustainable development，The application of multistage gear oil has far-reaching social significance and huge economic benefits。 keyword：Automotive multigrade oil vehicle gear oil fuel economy lubricating additive introduction As you know，The rapid development of the automobile industry is a great pride of human civilization、At the same time、The energy consumption and exhaust emissions of automobiles have increasingly become a major obstacle to human development。
2015-02-21 Reading quantity 2934
introduction：compresionmoldingCompression forming flashmoldOverflow mold plsitivemoldExtrusion die splitmoldSplit die cavityType control master mold coreMold core male mold tapertaper leathercloakImitation leather shiverornamentation flowm
2015-02-21 Reading quantity 2923
introduction：1．precisionNSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe function of the bearing fit is to makeNSKThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(Usually a bearing seat)And rotating part(Usually an axis)Solidify together，Thus, the basic tasks of transferring the load in the rotating state and defining the position of the moving system relative to the stationary system are realized。]Requirements for matching parts Due to precisionNSKbearing[NSKbearing:Seiko Co., LTD（NSK
2015-02-21 Reading quantity 1478
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