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Light produced by stimulated emission。A device that amplifies or oscillates light waves by stimulated emission﹐Called laser。Since the development of the ammonia molecular maser and the Ruby microwave quantum amplifier﹐A new discipline was formed──Quantum electronics。Quantum electronics succeeded in the microwave segment﹐Prompted American Townes﹐C.H.andA.L.Schawlow﹑Basov﹐..And Prokhorov﹐..It is proposed that similar devices can also be constructed in the optical band。1960years﹐AmericaT.H.mayman
rightINAbearing[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。]Regular maintenance of equipment、One-way bearings that are removed during operation and replacement of peripheral parts[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
In a sense，The injection mold is also a displacing device，That is, the plastic melt enters the mold cavity，At the same time, the air in the mold cavity is displaced。In fact, the air in the mold is not confined to the cavity，Especially the three-plate injection mold，The air present in the flow path cannot be ignored。In addition,Plastic melt produces trace amounts of decomposition gas。These gases must be discharged in time。 If the exhaust performance of the mold is poor, it is easy to produce bubbles、Silver streak、Cloud and mist、Filling insufficiency、Surface scorch、Discontinuous injection and other poor。therefore,The mold should be equipped with a reasonable layout of the exhaust structure in order to avoid the exhaust is not very good caused by bad products，often
A rotary pump that depends on the volume change and movement of the meshing space formed by the pump body and the screw to transport liquid or pressurize it(Sight-seeing pump)。Screw pump is divided into single screw pump according to the number of screws﹑Double screw pump and three screw pump, etc。figure Double screw pump It is a double screw pump。When the active screw rotates﹐Drive the driven screw with which it engages to rotate﹐The volume of the screw meshing space at one end of the suction chamber gradually increases﹐Pressure reduction。The liquid enters the meshing space volume under the action of pressure difference。When the volume is increased to the maximum to form a sealed cavity﹐The liquid moves continuously along the axial direction in each sealed cavity﹐Until one end of the cavity is discharged。Now discharge cavity one
SelectINAbearing[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。]There are two types of lubrication：Oil lubrication and grease lubrication。There are advantages and disadvantages to both types of lubrication。 Grease lubrication General rollingINAbearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is fixed and reduced during mechanical transmission
First up is the，Size limitation。Normal 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。]The space that can be installed is limited。In most cases，Shaft diameter（OR-bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is used to fix and reduce the friction coefficient of load during mechanical transmission
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[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 are on the shaft
CimatronThe fast parting function（QUICK SPLIT）manufacturing-oriented，Mainly used in the mold core、Design of the cavity,Mold structure design、Design of electrodes required for processing, etc。This function enables users to analyze the parting direction directly according to the surface model，The surface is automatically divided into cores、The cavity has two parts，Automatically generate parting lines for users，Then a variety of methods are used to rapidly generate the surface of the mold according to the existing parting line，Finally, the final design result is formed by editing。The fast parting is cored directly to the surface model、Design of the cavity，No transformation by the surface data model is required
Cement production enterprises are high energy consumption、Big polluting industry，From an energy and environmental perspective，Dry rotary kilns tend to replace wet rotary kilns。The large dry cement production line introduced from abroad in recent ten years has put forward higher requirements for equipment lubrication，For large、It is difficult to obtain suitable oil substitutes for critical equipment in China，For example, the reducer of the large ball mill，The lubrication of the open gear of rotary kiln is basically the use of imported special lubricating oil/fat。 The moving parts of cement plant equipment are mainly gear drives、Plain bearing[bearing:bearing（“Bearing”，day
For the use of tower cranes，Technical preparations before installation，Prepare the installation personnel，Installation matters and disassembly precautions are very important，These attention details can ensure the performance of the tower crane，And extend the service life of the tower crane。 Tower crane installation and disassembly precautions： Technical preparation and precautions before installation of tower crane： （1）According to the requirements of the tower crane manual and basic design data，Check the main control items of foundation construction quality。 Detect the geometric size error of tower crane foundation，It should be within the permissible range
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