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introduction：A heat exchanger with a serpentine tube as a heat transfer element。Its an ancient heat exchanger。It is simple in structure，manufacture、Install、Easy to clean and maintain，Low price，It is especially suitable for the cooling of high-pressure fluids、condensation，So it is still widely used in modern times。But the volume of the coil heat exchanger is large、unwieldy；High metal consumption per unit heat transfer area，Low heat transfer efficiency。Depending on the cooling method of the fluid outside the pipe，Coiled tube heat exchangers are divided into immersion and spray。 Immersion heat exchangers immerse the coil in a liquid（B fluid）Inside the container，Theres another kind flowing through the tubeAfluid。pass
2015-03-22 Reading quantity 2783
introduction：Planetary gear reducer type selection points The planetary reducer is the most important type of reducer that matches the servo motor，When selecting a planetary gear reducer，First of all, determine the reducer reduction ratio，If the standard reducer does not have the reduction ratio you need，Please choose a close or customized reducer from our company。 After determining the deceleration ratio，Please multiply the rated torque of your chosen servo motor by the reduction ratio，The value obtained is in principle less than the rated output torque of the similar reducer provided in the product catalog，At the same time, the overload capacity of the driving motor and the maximum working torque required in practice should be tested。The maximum operating torque required is indicated in the rated output
2015-03-22 Reading quantity 2896
introduction：The reducer series represented by the planetary reducer plays an important role in the mechanical device，According to the general staff summary，The main role can be divided into the following5Kind of: 1)Change the output speed of the engine(retard、Speed up or speed change)，To suit the work needs of the working organization 2)Change the torque of the engine output，To meet the requirements of the working organization 3)The motion form of the output of the power machine is transformed into the motion form required by the working mechanism〔If the rotating motion is changed to a linear motion，Or vice versa) 4)Transfer the mechanical energy of a power engine
2015-03-22 Reading quantity 2794
introduction：blackness: The radiant force of an actual object E With the black body under the same temperature(See black body and gray body)Radiant force ofE 0Ratio of﹐Also known as emissivity。blacknesse=(E /E 0)﹐It reflects how close an object is to a blackbody in terms of its radiating power﹐It is an important parameter in radiation heat transfer。G.Kirchhoff demonstrated by simulating an artificial cavity with a blackbody at the same temperature﹐The blackbody has the greatest radiant force﹔The irradiance of an objects surface(density)Is numerically equal to the absorptivity of the table facing input radiation from the same temperature。therefore﹐All objects with a high radiation force have a high absorption force。The blackness of the blackbody is equal to1.0﹔
2015-03-22 Reading quantity 2797
introduction： 1．Structure of surface grinding machine As shown in the figure3-54 The outline diagram of horizontal shaft rectangular table surface grinding machine is shown。The grinding wheel spindle of this machine tool is usually driven directly by an internally connected asynchronous motor。Usually the motor shaft is the main shaft，The stator of the motor is mounted on the grinding wheel frame3Inside the shell，Grinding wheel carrier3 Can slide along the seat4Dovetail guide rail for intermittent transverse feed movement(Manual or hydraulic，Slide seat4 And grinding wheel holder3 Along column5 The guide rail for intermittent vertical cutting movement(Manual operation)，workbench2 Along bed1 The guide rail for longitudinal reciprocating movement(Hydraulic drive)。 The horizontal shaft produced in China is rectangular and flat
2015-03-22 Reading quantity 1454
introduction：To judge the removed high temperature 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。]Whether it can be used again，Check the bearing after washing，Carefully check the raceway surface、Rolling surface、State of mating surface、The wear condition of the cage、FAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And with solid Windows
2015-03-22 Reading quantity 1524
introduction：A trial-and-change design method is traditionally used to determine the location of the overflow chute，Mainly by experience，And its usually a guess。Because these shapes are critical to the quality of the casting，It must therefore be properly set up before any quantity of production is completed。The overflow chutes are used to collect oxides and other nonmetallic inclusions formed when molten metal fills the die casting cavity。 Ford Motor Company in the United States by using computational fluid dynamics software(CFD)To simulate the flow of metal in a die casting mold，Thereby reducing the volume of the overflow tank（The amount）。Simulation design of a successful runner and overflow location，The key is in the software
2015-03-22 Reading quantity 2856
introduction：According to the different roles of each part in the mold，A set of injection molds can be divided into the following parts： 1）Internal mold parts，A part that gives shape and dimension to the forming material。Usually byCore（Die laying）Cavity（Upper die），insert（Insert needle）Equal composition。 2）Gating system：The molten plastic is directed through the injector nozzle to the closed mold cavity，Generally by the mouth of the main channel、Diversion channel、The gate and cold hole are composed。 3）Heat exchange system：In order to meet the requirements of injection molding process for mold temperature（Cooling or heating）It is necessary to control the mold temperature more accurately。 4
2015-03-22 Reading quantity 2798
introduction：Mass production technique mass production technology ergonomics ergonomics Factory layout plant layout Factory production automation factory automation Plant design plant design Feasibility study feasibility study Production operation plan production planning and scheduling Technical preparation for production prepar
2015-03-22 Reading quantity 2907
introduction： So-called wear，It refers to the process of continuous loss or residual deformation of material on the working surface when the dual surface of the moving pair moves relative to each other。The wear process is mainly due to the mechanical interaction between the dual surfaces，Sometimes it is produced by chemical action。Usually this mechanical action refers to the action of friction，Chemical action often refers to the erosion of environmental media and chemicals。When lubricated with grease，Grease film can reduce the wear of the dual surface and prevent the entry of aggressive substances。 wear、Aging and fracture are the three main causes of damage and failure of mechanical parts。Run-in only during the initial stage of wear or minor wear
2015-03-22 Reading quantity 1560
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