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introduction：Metal bolt can be divided into mechanical type according to its anchoring form、Tube seam type and bonding type three categories。 one、Mechanical bolt Mechanical bolt was first used、Diverse structure、A large number of bolts。The anchoring mechanism of mechanical bolt itself is a unity，When installing the bolt，The anchoring mechanism is mainly strained on the wall of the borehole through a wedge system to carry out axial or radial dislocations in the borehole。The anchoring mechanism transmits most of the anchoring force to the rock strata through the frictional connection。Mechanical bolt during installation，Most produce preload。At times，Even the anchoring mechanism must be fixed directly by preloading force。 The advantages of mechanical bolt are
2015-03-28 Reading quantity 1461
introduction：takedownKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sizedKOYORolling bearings are equipped with retainers。 inKOYOBearing in the processing process，The outer ring of the bearing、Inner ring、How do the roller and cage fit together。]During overhaul，First record the bearing appearance，Confirm residual lubricant，After taking a sample of the lubricant for inspection，Bearing washing。As a cleaning agent，Regular gasoline、kerosene。Cleaning of removed bearings，Divided into rough cleaning and fine cleaning，Respectively in...
2015-03-28 Reading quantity 1561
introduction： Rolling 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。]，If there is no choice error can be used correctly，Before bearing life，It can be used for a long time，In this case，The damage state is exfoliation。On the other hand，And unexpected premature damage，And can not withstand the early damage of use，As the cause of this early injury
2015-03-28 Reading quantity 1574
introduction： Pawn 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。]When the retainer falls apart，The balls converge to one side。When disassembling and replacing，NSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe role of bearing fit
2015-03-28 Reading quantity 1566
introduction： TIMKENbearing[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。]Its a precision part，TIMKENThe use of bearings must also be carefully carried out accordingly。No matter how high performance bearings are used，If used improperly，You dont get the high performance you expect。 （1）、Keep bearings and their surroundings clean
2015-03-28 Reading quantity 1563
introduction： The working speed of the rotor of rotating machinery is close to the natural frequency of its transverse vibration and the characteristic speed of resonance。Steam turbine、The rotor of high-speed rotating machinery such as compressors and grinders，Eccentricity due to improper manufacturing and assembly, and the reaction of oil film and support,In operation, an arcuation occurs when the speed approaches the critical speed，The amount of deflection increases significantly，Cause severe vibration of the support,Form resonance,Even the whole unit and plant，The natural frequency of rotor lateral vibration causing destructive accidents has many orders,Therefore, the corresponding critical speed also has multiple orders,The values are denoted in descending order1,2,……It has practical engineering significance
2015-03-28 Reading quantity 2818
introduction： A small and light lifting device used to lift or pull heavy objects by manually pulling a chain or turning a handle(Hoisting machinery)。Break up the pull gourd and the lever gourd two kinds。 Hand hoist﹕The chain is pulled by hand﹐Through sprocket﹑The gear drives the lifting chain up﹑Drop weight(figure1 Hand hoist )。Hand chain and lifting chain mostly use ring chain。Hand hoist with ratchet﹑pawl(See ratchet mechanism)﹐To stop the weight from falling freely。The lifting weight is generally0.5～30Tons of﹐The lifting height is usually2.5～3meter﹐It can be bigger。It can be used alone﹐Also available as beam type
2015-03-28 Reading quantity 2914
introduction：1.Rolling mill oil film 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。]Perfect lubrication management According to the incomplete statistics of the current situation in China，Abnormal wear of oil film bearing80％The above are caused by the failure or improper use of the oil film bearing lubricant or oil film bearing lubrication system，Especially contaminated with solid particles in lubricating oil、water
2015-03-28 Reading quantity 1468
introduction：In this paper, the application of frequency converter on external grinding machine in machining industry is analyzed in detail，Frequency conversion speed regulation technology is introduced into the main motor of cylindrical grinding machine as the power，To meet the needs of various kinds of coaxial cylindrical grinding，Improve work efficiency，The machining quality of shaft grinding is improved，Save energy。Combined with the actual field application，Operators have better reflexes，Surface smooth imaging degree is high，The yield has been greatly improved。 introduction External cylindrical grinding machine used for standard machining，The grinding wheel motor runs according to the traditional starting circuit。The motor runs at the rated speed after starting，by
2015-03-28 Reading quantity 2797
introduction： Basic knowledge of die steel one、Basic classification 1.The types of steel are very mixed and many，Among them, mold steel is divided into three categories： a.Plastic die steel：High finish b.Hot working tool steel：High strength、High temperature resistance c.Cold working tool steel：High pressure resistance、wear-resistant——‘High speed tool steel’A branch of 2.Common brand marks： a.JIS——Japanese industrial specification b.ASTM——American Society for Testing Materials specifications c.A
2015-03-28 Reading quantity 2908
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