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introduction：Heat pipe： An effective heat transfer element used in spacecraft thermal control。It has a very high thermal conductivity﹐Generally by tube shell﹑Tube core and working medium(Working medium)Make up﹐1942United StatesR.S.Goller introduced the concept of heat pipes﹐1963United StatesG.M.Grover invented heat pipes﹐Since then, the research and application of heat pipes have developed rapidly﹐1967The United States for the first time put a stick of water-Stainless steel heat pipe mounted on the satellite﹐Space flight tests were conducted﹐First applied the following year“Geodesic satellite”(GEOS-B)。Since then, heat pipes have been widely used in spacecraft thermal control。China in1976years
2015-04-27 Reading quantity 2852
introduction：summarize 1. Machining accuracy and machining error Machining accuracy refers to the actual geometric parameters of the parts after machining(dimension、Shape and position)The degree of conformity with ideal geometric parameters。The actual machining can not be done exactly with the ideal part，There will always be deviations of different sizes，The deviation degree of the actual geometrical parameters from the ideal geometrical parameters after machining，Called machining error。 2.Machining economic accuracy Because there are many factors in the processing process that affect the processing accuracy，Therefore, the same processing method can achieve different accuracy under different working conditions。Any kind of processing method，With care
2015-04-27 Reading quantity 2876
introduction：1.Frictional compatibility The property of preventing adhesion and boundary lubrication when the bearing diameter is in direct contact with the bearing bush。The material factors that affect the friction compatibility of friction pairs are： （1）The degree of difficulty in forming alloys in metallurgy。 （2）Affinity of material to lubricant。 （3）Friction factor of the auxiliary material in the non-lubricated state。 （4）Microstructure of materials。 （5）Thermal conductivity of the material。 （6）The size of the surface energy of the material and the characteristics of the oxide film。 2.embedability The material allows foreign hard particles in the lubricant to clamp in and prevent scratching or scratches
2015-04-27 Reading quantity 1554
introduction：As shown in the figure1As indicated，The double pressure valve is also equivalent to the combined structure of two check valves，Its function is equivalent to“And gate”。It has two inputsP1andP2、An outletA。whenP1andP2When there is input alone，The spool is pushed to the other side，Ano-output。Only ifP1andP2When there are simultaneous inputs，AOnly output。whenP1andP2Input pressure is unequal，Low air pressure throughAexportation。Double pressure valves are often used in pneumatic circuits“And gate”Component use。
2015-04-27 Reading quantity 2978
introduction： Ever since1972SwitzerlandTrimosThe Company and its subsidiariesSYLVACThe company has successfully developed a capacitive grid measurement system for length measurement，Capacitive grid measuring system has been widely used in precision electronic measuring tools and digital display measuring instruments。Nowadays, many enterprises at home and abroad are actively researching and applying this technology，The result is very good。My company after years of hard work，Capacitive grid measuring system technology has been widely used in electronic digital display measuring tools and digital display measuring instruments，Develop and produce a variety of series of digital display measurement products。 one、The basic principle and characteristics of capacitive grid measurement system：
2015-04-27 Reading quantity 2962
introduction：An instrument for recording dynamometer charts。According to the working principle，Indicator can be divided into mechanical type、Gas-electric and electronic3class。 Mechanical indicator It is a type of indicator used in the era of steam engines。The basic principle is：On the one hand, the movement of the piston is drawn out by the slider and drives the recording paper to move along the horizontal coordinate；On the other hand, the gas pressure in the cylinder drives the pen tip along the longitudinal axis through the small indicator piston，Thus, the gas pressure in the cylinder and the position of the piston are directly plotted（Volume change）The corresponding relationship of。This type of indicator has high mechanical inertia，The vibration and friction are serious，So the error in the log is also
2015-04-26 Reading quantity 2906
introduction：influenceINAbearing[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。]For many rotating machinery products, their service life depends on the life of the bearing components in the key parts of the product。 “maintenance-free”Bearings are not bearings that will never be damaged or fail, but that will not be damaged within a certain period of time。Here the designer
2015-04-26 Reading quantity 1635
introduction： Takayuki Takasugi, Professor and Yasuyuki Kanino, Associate Professor of Materials Engineering, Graduate School of Engineering Research, Osaka Prefecture University，With JapanPillow Block（Head office：Sakai City, Osaka Prefecture）Jointly developed ball bearings with excellent heat resistance[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 inner and outer rings of this bearing are made of nickel（N
2015-04-26 Reading quantity 1572
introduction： electrode The electric field that causes the ions to move in the solution under test is generated by two electrodes in direct contact with the solution。The pair measuring electrode must be made of a material resistant to chemical corrosion。Titanium and other materials are often used in practice。A measuring electrode consisting of two electrodes is called an Errausch（Kohlrausch）electrode。 The measurement of electrical conductivity requires understanding of two aspects。One is the conductivity of the solution，The other one is in solution1/AGeometric relation of，The conductance can be through an electric current、The voltage is measured。This measurement principle is applied in todays direct display measuring instruments
2015-04-26 Reading quantity 2937
introduction： Injection mold is the most important molding equipment for injection molding products processing，Its quality is directly related to the quality of the product。moreover，Because the mold occupies a large proportion in the production cost of injection molding processing enterprises，Its service life directly affects the cost of injection molded products。therefore，Improve injection mold quality，And maintain and maintain well，Extend its service life，It is an important subject for injection molding product processing enterprises to reduce cost and increase efficiency。 Injection molding products processing enterprises due to the variety of products，The mold is changed frequently，After completing a production cycle，Molds are generally stored straight
2015-04-26 Reading quantity 2928
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