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introduction：The way to choose an electric forklift Select the electric forklift and configuration according to the working condition The selection of models and configurations should generally start from the following aspects： 1、Operation requirement Forklift operating requirements include pallet or cargo specifications、Promotion height、Operating channel width、Gradients and other general requirements，Operational efficiency also needs to be considered（Efficiency varies from car to car）、Work habit（If you are used to sitting or standing）And other requirements。 2、Job function The basic operation function of electric forklift truck
2015-02-09 Reading quantity 2863
introduction： A test to determine the mechanical properties of a material under axial static pressure，It is one of the basic methods to test the mechanical properties of materials。The maximum compressive load at the time of specimen failure divided by the cross-sectional area of the specimen，It is called compressive strength limit or compressive strength。The compression test is mainly applied to brittle materials，Cast iron、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，Used to reduce the coefficient of friction in the process of power transmission and keep the center of the shaft fixed
2015-02-09 Reading quantity 2878
introduction： The freeze-drying method is to combine a substance containing a large amount of water,Pre-cooled and frozen solid,The water vapor is then sublimed directly from the solid under vacuum conditions,The sublimated water vapor is captured by condensation method,Causing the substance to dehydrate and dry。Freeze-drying has the effect of avoiding the decomposition of drugs by heat、Loose product texture、Dissolve quickly after adding water、Low water content(1%～3%)、Good stability、Favorable storage、Less chance of contamination、High product quality features。therefore,Freeze-drying in bioengineering、Medical industry、Food industry scientific research has been widely used。Such as Xiamen Tebao biological engineering company Telli、Fujian (Province)
2015-02-09 Reading quantity 2941
introduction： saltedCarbopol—reg;resinomelloidBrookfieldViscosity measurement Abstract： CarbopolResin based glues maintain high viscosity even when inorganic salts are added。This paper mainly introduces how to measure the content of sodium chloride after adding itCarbopolResin based glueBrookfieldviscosity。 Safety protection work： 1．Wear safety goggles and gloves。 2．To avoid resin dust irritation of the respiratory tract。
2015-02-09 Reading quantity 2825
introduction：1、Standard couplings are selected Designers in the selection of couplings should first have been developed for the national standard、Mechanical industry standards and national patented coupling selection，Only when the existing standard coupling and patented coupling can not meet the design needs, you need to design your own coupling。 2、Select the coupling variety、type Understand couplings（Especially flexible couplings）Integrated functions in the drive system，From the overall design of the transmission system，Select the coupling variety、type。According to prime mover class and working load class、Working speed、Transmission accuracy、Two-axis offset condition、temperature、wet
2015-02-09 Reading quantity 1575
introduction：The main damage forms of the cross shaft are:wear、Have a crack、The surface of the journal of the cross shaft is severely damaged(Like peeling metal、There are obvious depressions)。If the journal surface is slightly spalling,Continue to use after polishing and peeling surfaces with oil stones,If there is serious damage,The cross shaft should be replaced。In addition,Cross shaft,The following contents should also be overhauled: (1)Check crossSUNTHAIbearing[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，
2015-02-09 Reading quantity 1500
introduction：（one） layout： Layout refers to the arrangement of blanking parts on strips or strips on boards。 The circular layout is to improve the material and rate。 1、 Material utilization rate K=F0/F*100%=Actual area of blanking parts *100% among: K=Material utilization rate。 F=Sheet area。 F0=Blanking parts area design scrap：The waste produced by the various internal holes of the workpiece。 2、 Scrap from blanking parts： Process waste：Waste arising from the presence of edges between workpieces and between workpieces and strip sides, and waste arising from head and tail。Dependent impulse
2015-02-09 Reading quantity 2991
introduction： Use the round butterfly plate as the opening and closing parts and rotate with the valve stem﹐To achieve the opening and closing action of the valve(figure1 Butterfly valve )。Butterfly valve structure is simple﹐Quick switch﹐Small size﹐Light weight and small opening and closing torque。According to the sealing requirements vary﹐Butterfly valves can be individually designed to have a truncation﹑The function of regulating or truncating。Butterfly valves are widely used﹐In particular, there is a trend of gradually replacing gate valves in low-pressure large-diameter water supply pipes。The maximum diameter of the butterfly valve is reached10meter。Large diameter butterfly valves are generally equipped with slow closing damping devices﹐To prevent water shocks。The sealing material of butterfly valve is usually rubber﹐Be used for
2015-02-09 Reading quantity 2844
introduction： Ideal gas: An idealized gas often used as a working medium。It fits the equation of statepv=RT 。On a micro level﹐It assumes that the molecules of the ideal gas are elastomers﹐Ignoring the intermolecular forces and the volume occupied by the molecules themselves is a natural conclusion﹐Therefore, it has the most concise relationship between the physical structure model and the thermal state parameters。The actual gas is more or less deviated from the ideal gas﹐But the temperature is usually higher﹑Low pressure gas(Like air in the atmosphere﹑Boiler flue gas﹑Gas in internal combustion engines and gas turbines
2015-02-09 Reading quantity 2845
introduction：Residual stress value（kg/mm2)post-carburizing880-900Degree salt bath heating，260Degree isotherm40minutes-65 post-carburizing880-900Degree-salt bath heating quenching，260Degree isotherm90minutes-18 post-carburizing880-900Degree salt bath heating，260Degree isotherm40minutes，260Degree tempering90minutes-38 Slave table1The test results show that the surface residual compressive stress of isothermal quenching is higher than that of normal quenching low temperature tempering process。Even low temperature tempering after isothermal quenching,Its surface residual compressive stress，It is also higher than low temperature tempering after quenching。Thus it can be concluded that
2015-02-08 Reading quantity 1515
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