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introduction：Under certain conditions，The ability of an object to return to its original equilibrium position after deviating from its equilibrium position。Such as the tower crane generally to add the appropriate counterweight，When it bears various loads, the center of gravity is always within the range around the support point without tipping over。The piston rod of the hydraulic cylinder、The screw of the press、The compression chord of the steel structure of the crane and other slender rods，All have to be checked for stability。The web of welded box structure has the problem of thin plate stability。Thin-walled pressure vessel under external pressure or vacuum，The stability of the container shape needs to be considered，If it is not stable, it will be concave and convex deformation。 Instability and its form object deviation from flat
2015-02-17 Reading quantity 2790
introduction：When first created and retrieved（As long as the model is saved in the default orientation），The model is displayed in the default view orientation。Can use“orientation”(Orientation)Dialog box（“view”(View)>“direction”(Orientation)>“redirection”(Reorient)）Change the default orientation of the model or create a new orientation。Use this dialog box，You can perform the following operations： Rotate by using a wire frame、translation、Scale and flip the model，Views can be oriented dynamically。You can also use the mouse to rotate in the graphics area
2015-02-17 Reading quantity 2802
introduction： 1、Working medium and working conditions In specific selectionOShape ring material，First of all, consider the compatibility with the working medium。It is also necessary to consider the pressure at the seal、temperature、Continuous working time、Operating conditions such as operating cycle。If used in a rotating situation，Temperature rise due to frictional heat must be considered。Different seal materials，Its physical and chemical properties are different，see《Rubber seal material characteristics table》。 2、Seal form According to the type of load can be divided into static seal and dynamic seal；According to sealing purposes can be divided into hole seals、The shaft is sealed with a seal and a rotating shaft；According to its installation form can be divided into radial installation
2015-02-17 Reading quantity 1412
introduction：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。]Fault analysis，Bearings are an important part of system engineering to improve working surface reliability（The working function of the bearing is lost in its provisions，A phenomenon that causes failure or non-operation as a failure is called（Bearing failures can be divided according to their normal life failures and two early failures，Its mostly needles
2015-02-17 Reading quantity 1538
introduction：Diametrically less than6mmIt is more difficult to bore the hole，Prone to tool cracking。For this purpose，Some tool manufacturers have specially designed and manufactured indexable tools to bore diameters1mmpinhole。Rely on proper machining centers，Adopt appropriate cutting speed and feed rate、Adequate chip removal space and stable tool performance，Any small hole can be boring。 Tool installation When boring holes，The most important thing is to install the tool correctly on the machining center。In the hole boring，The center height of the tool is an important factor leading to tool failure。If the tool is installed below center height，
2015-02-17 Reading quantity 2798
introduction： Horizontal machining centers have good flexibility，Easy to form flexible processing automatic line，It has become the preferred equipment mother machine for manufacturers。among，Machining centers with double pallet switching devices are the most widely used，It has a double workbench，Saves time for workpiece clamping and disassembling。 Due to the plate switching device before rotation，It needs to be lifted，The traditional design of the past is to use the direct jacking device of the cylinder without self-locking function，Safe and smooth operation only at slow speeds，Otherwise, it will cause high impact and unreliable。 For this purpose，Under development height
2015-02-17 Reading quantity 2889
introduction： Pneumatic transmission A pneumatic actuator that converts the pressure energy of a compressed gas into mechanical energy and produces rotational motion。The commonly used pneumatic motor is a positive displacement air motor﹐It uses the volume change of the working chamber to do work﹐Split blade type﹑Piston type and gear type。figure Schematic diagram of vane type air motor Diagram of vane type air motor。The rotor is mounted in an eccentric stator。The blade is installed in the radial groove of the rotor﹐Bottom spring﹐The space between the stator and the rotor is divided into a number of cheap rooms。When compressed gas comes from the air intake A Entering the air chamber﹐Drive rotor rotation﹐Exhaust gas is discharged from the exhaust port﹐Residual gas
2015-02-17 Reading quantity 2801
introduction：Domestic reducer with the improvement of competition mode and product structure，The fields of application are gradually expanding，Industry equipment technology is constantly improving，The industrial base has been strengthened。Chinas reducer industry to achieve a new breakthrough，We should focus on brand building，Actively grasp and forecast the development status of the industry，In technological transformation、Dislocation competition、Diversified product types、The construction of innovative enterprises has been strengthened。 According to statistics：Up to2012years，The development of Chinas reducer industry has been near40Years of history，Reducer is widely used in the major equipment manufacturing industry transmission and speed regulation equipment，In modern scientific research、National defense、Hand in
2015-02-17 Reading quantity 2817
introduction： Lead-free technology makes the biggest difference in the welding process，It is also the most difficult part of the whole process technology。Changes in this regard，It is the change in the melting point and surface tension of the welded metal after removing the lead metal。The characteristics of these two aspects change，The formulation of the flux originally used in tin lead must be redesigned or adjusted。The change of melting point temperature and the difference of flux composition also cause the change of welding process parameters。From the results of the current study，Of all the more substitutable alloys，The melting point temperature is higher than that of existing tin-lead alloys。For example, from the current more likely to be widely accepted by the industry‘tin-silver-copper’Alloy screen
2015-02-17 Reading quantity 2799
introduction：Expansion ring seal Contact dynamic seal with expansion ring blocking leakage gap(See picture Expansion ring seal structure )。The expansion ring seal can be used for reciprocating or rotating motion。The expansion ring is a metal elastic ring with a cut﹐Commonly known as piston ring。The incision is open when the expansion ring is free﹐The incision is closed after loading into the cylinder block﹐The outer circle of the expansion ring is tight to the inner surface of the cylinder body by means of elastic force。Working hours﹐The expansion ring is pressed to one side of the expansion ring groove by the pressure of the working medium﹐The outer cylinder of the expansion ring and the sticking end face together play a sealing role。The expansion ring is usually made of cast iron or tin bronze﹐It is mainly used for piston sealing of reciprocating compressors and internal combustion engines with high operating temperature﹐As well as steam
2015-02-17 Reading quantity 2892
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