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introduction： one、Process flow liven→Check material→Card mount→drying→preheat→heat→cooling→oil（Hot calibration）Or classification（cleanse）Or isotherm（cleanse）→In-process inspection→temper→cleanse→sandblast→rust-proof→straightening→Final inspection。 two、Process operation （1）See the pattern when you take it alive，Inventory quantity，Check material，See weld position，Determine the quenching cooling method，Handle it gently。 （2）Principles for selecting fixtures： a.Make the tool evenly heated during the heating process。 b.Slender rod、easy
2014-12-20 Reading quantity 1519
introduction：Centrifuges are very common separation tools in laboratories，It can be divided into several kinds according to the purpose of its use：Low speed centrifuge、High speed refrigerated centrifuge、Ultra-high speed vacuum centrifuge, etc；Theres a cell centrifuge at low speed，And the common micro centrifuge。Use centrifuge head weight safety，Because centrifugal force out of control can cause a lot of damage。Therefore, pay attention to whether the centrifugal tube is balanced，Whether the centrifugal speed exceeds the limit，Whether the centrifugal tuo is corroded or overloaded。 instrument： High speed refrigerated centrifuge Centrifugal tuo and centrifugal tube microcentrifugeｍｉｃ
2014-12-20 Reading quantity 2791
introduction： The first5speak SINUMERIK 810 T/MMaintenance of(Up.) Siemens(China)Limited company (Peking 100028) Zhang Taihua one、SINUMERIK 810T/MThe structure of SINUMERIK 810T/MIts a mid-range numerical control system from Siemens。In order to better understand and use the system，Firstly, the hardware and software structure are introduced to the user from the perspective of maintenance，Combined with maintenance examples to explain to users how to eliminate some common faults。 1.810T/MHardware architecture of
2014-12-20 Reading quantity 2783
introduction： 1.Preparation before installation (1)Open the package and check the attached certificate and the label on the slewing bearing，Verify that it is the same as the selected model。 (2)Check the appearance carefully，Confirm that the slewing support has not suffered great damage during transportation，Such as severe rust、amorphosis；Confirm the presence of soft tape markers and gear runout maximum position markers(When the gear is required to be quenched or customers have special requirements)。 (3)The mounting bracket should have sufficient stiffness，To prevent slewing bearing installation due to insufficient steel bracket，Deformation causes the slewing support to not work properly。 (4)The installation plane must be clean、smooth，No iron
2014-12-20 Reading quantity 1472
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。]There are a lot of failures，Many use bearings[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，To reduce
2014-12-20 Reading quantity 1470
introduction： Chongqing Branch using oil depot apron pipeline refueling system recently put into use three Zhejiang Jiali company production125GY150In-line pump，After more than two years of operation，It is proved that this kind of high coaxial pipe centrifugal pump with vertical pipe structure has simplified process pipe accessories、Smooth flow in and out、Shaft end seal near zero leakage、Low noise、Low power consumption。 With the economic development of Chongqing and the increase of fuel supply for civil aviation flights，Apron line refueling has become the main mode of aircraft refueling。To ensure normal oil supply，Normal use and fast maintenance of pipeline pumps become
2014-12-20 Reading quantity 2835
introduction：In severe cases, metal stripping occurs on the contact surface and large, messy scratches appear；In general， NSKImported 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。]Mechanical damage refers to different levels of grooves on the alloy surface of the bearing。The main reason of bearing mechanical damage caused by the simultaneous existence of contact surface damage and ablative phenomenon is that the bearing surface is difficult to form oil film or the oil film is seriously damaged。 The outer surface has plastic deformation and cold hardening
2014-12-20 Reading quantity 1558
introduction：An axis that converts linear reciprocating motion into rotating motion。In a reciprocating piston engine,A piston that receives power and moves in reciprocating motion,The crankshaft is rotated by means of a connecting rod to output power。In reciprocating air compressors and pumps，The rotating main shaft of the power engine drives the piston to reciprocate in a straight line through the crankshaft and connecting rod。Crankshaft by spindle neck、Crank pin、The crank arm and shaft body are composed of parts(See picture[Crankshaft diagram])。The spindle neck is in a bearing fixed to the frame[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is used to fix and reduce load friction during mechanical transmission
2014-12-20 Reading quantity 2831
introduction：The viscosity of lubricating oil decreases with the increase of temperature，So its the same lubricant，Due to the temperature difference，Viscosity is different。This disposition is called“viscosity-Temperature characteristic”。Adhesion of grease-The temperature characteristic is more complicated than that of lubricating oil，Because of the stickiness of this structural system-The temperature characteristics also change with the change of shear force。 The viscosity of grease at a certain temperature is a variable that changes with the shear rate。This viscosity is called similar viscosity，The international unit of measurement is paras(Francesca).seconds(Pa•s)。The similar viscosity of greases does not obey Newtons law of liquid flow，It decreases with the increase of shear rate。by
2014-12-20 Reading quantity 1464
introduction： Materials are processed using laser beams﹐punch-like﹑slice﹑scribing﹑weld﹑Heat treatment。Laser processing has many advantages﹕①Laser power density is high﹐After the workpiece absorbs the laser, the temperature rises rapidly and melts or vaporizes﹐Even if the melting point is high﹑A material of high hardness and brittleness(cerify﹑Diamond etc)Laser processing is also available﹔②The laser head is not in contact with the workpiece﹐There is no machining tool wear problem﹔③The workpiece is not stressed﹐Not easy to pollute﹔④The workpiece can be moved or sealed in a glass shell
2014-12-20 Reading quantity 2821
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