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introduction： A device for opening and closing a valve using external power。The purpose of using the drive device is to make the operation of the valve labor-saving and convenient﹑Fast and reliable﹐Or realize automatic control and remote control。The basic requirements for the valve drive device are﹕Torque or thrust can meet the valve opening and closing needs﹐Precise and reliable control of stroke and torque﹐The choice of power is suitable for the site situation﹐The opening and closing actions meet the control requirements﹐The device itself is light and small。 The valve driving device is divided into multi-circle rotary according to the motion mode of the output shaft﹑Partially rotary and linear reciprocating 3Kind of。The multi-turn rotary type is suitable for the valve stem or valve stem nut that requires multiple turns to be fully opened or
2015-03-17 Reading quantity 2778
introduction：1、Light medium load plain 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。]Selection of lubricating oil operating temperature10-60℃，Journal pressure3MPabelow： Spindle journal linear speed>9m/s，Lubricating oil40℃viscosity5-27mm2/s，Suitable lubricating oilL-AN5、L-
2015-03-17 Reading quantity 1447
introduction：INAbearing[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 continue to be used is based on the degree of damage that needs to be considered，The main consideration in this regard is the effect of damage，For mechanical properties，significance，Installation conditions are to be considered，The effect is determined by the period until the next overhaul，But for defects
2015-03-17 Reading quantity 1523
introduction：1、Imported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，Of course, the price is not cheap。]Model selection：The bearing type is generally selected by the users technical personnel according to the use conditions and load of the supporting products。Business personnel mainly understand whether the actual load of the user is different from the selectedINABearing coincidence，If the bearing does not meet the requirements of use，Customers should be advised to change models as soon as possible，But unless the special product in the selection of the model generally will not have any problems
2015-03-17 Reading quantity 1532
introduction：1.Precision improvement method SKFDeep groove ball 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。]After the installation on the host is complete，Such as measuring the radial runout of the spindle，It can be found that the measured value of each turn has a certain change；When measuring continuously，It can be found that after a certain number of revolutions，This change is approximately repeated。Measure the course of change
2015-03-17 Reading quantity 1521
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.entrapability The material allows foreign hard particles in the lubricant to clamp in and prevent scratching or scratches（and
2015-03-17 Reading quantity 1462
introduction： For use 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。]As for，Making noise is quite common。Even ifTIMKENThe same is true of low-noise bearings in bearings。In that way，Why the noise？Ill do it today
2015-03-16 Reading quantity 1445
introduction： [Abstract]Through the process analysis of porous matrix in blanking，A reasonable stamping process is adopted，The design of mold structure and main parts are introduced，The quality of the matrix is guaranteed。 keyword Porous matrix punching Process analysis die 1 introduction figure1Shown part，For our company diamond saw blade matrix，The material is...28CrMo，The thickness is...2.6mm，Outside diameter is∮326mm，Multiple rows are distributed on the matrix∮7mmRound hole and obliqueuv-groove，Because the teeth of the subsequent welding knife are laser welding
2015-03-16 Reading quantity 2901
introduction： 1Presentation of problem Matou power plant#7Machine design2Table condensate pump,The original model is14NL-14type,The main parameters are as follows:Flow rateQ=510m3/h,headH=140m，Rotational speedn=1480r/min，Motor power278kW，efficiency70，Cavitation allowance2.0m。 This type of condensate pump has the problem of insufficient output in long-term operation，The knock-on problems are as follows。 a.To ensure condensate flow，Meet the water requirements to the deaerator，Maintain deaerator water level，In operation, the deaerator only adopts the operation mode of low pressure limit（
2015-03-16 Reading quantity 2829
introduction： The slab and the mandrel rotate together，Feed and apply pressure by roller wheel，Stamping process in which the slab is deformable locally and point by point against the mandrel（See picture[Spinning principle]）。Spinning can produce a variety of axisymmetric rotating parts，loudspeaker、Missile body、High pressure vessel head、gong；Can also be used for gas cylinder closure、Billet forming, etc。The characteristics of spinning are：Large workpieces can be formed with a small deformation force；The equipment is relatively simple to use，Small and medium size sheet parts can be spun by ordinary lathe；Simple mold，All you need is a mandrel，Low material requirements。Spinning is suitable for small batch production,Due to the
2015-03-16 Reading quantity 2823
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