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introduction： An active connection in which two members of a mechanism interact with each other in a certain relative motion。Most of the kinematic pairs studied in mechanism science refer to the active connection of direct contact，And assume a pair of contact points called kinematic subelements、A line or surface has a perfectly accurate geometry，However, in mechanical dynamics and mechanism accuracy, material elasticity and fabrication are considered、Assembly error and other practical factors。 The classification methods of motion pairs are：①According to the contact，Low pair with surface contact and high pair with point or line contact。The former are shafts and bearings[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is fixed in the mechanical transmission process
2015-03-16 Reading quantity 2831
introduction：Friction clutch Use friction(Apparent friction)A clutch that transmits torque。Bonding time﹐The main﹑The friction parts are compressed under certain pressure。When the drive shaft rotates﹐Generate sufficient friction between the joint surfaces﹐Drive the driven shaft to rotate。The compression force disappears during separation﹐Joint separation﹐Friction disappears﹐The driven shaft does not move。The work of the friction clutch can be divided into engaging﹑Normal work and separation3stage。In the joining and separating stages﹐The speed of the driven friction is lower than that of the active friction﹐It will cause slippage﹐Leading to heating and wear of the working face。Joint smoothly if required﹐It should be engaged under no load as far as possible。The friction clutch engages quickly
2015-03-16 Reading quantity 2825
introduction：Reducer power（KW） Lubricating oil viscosity code（Medium duty industrial gear oil（GB5903～ 86）） ～200 68～100 200～600 150～220 600～1000 220～320 Reducer lubrication method and oil amount。The lubricating method of reducer mainly has the following several kinds：when3m/s≤V ≤12m/sWhen using oil margin lubrication；whenV≥12m/sUse circulating lubrication；Large gear and open gear using dry oil jet lubrication。 General provisions on the amount of oil immersed in the reducer using oil margin lubrication
2015-03-16 Reading quantity 2864
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。]The technical maintenance period is determined. The technical status of the machinery and its parts will gradually deteriorate during use，As a result, reliability deteriorates、Partial or total loss of ability to work。In order to make the machinery maintain good technical performance and high reliability level，You need to establish perfect reliability
2015-03-16 Reading quantity 1563
introduction：Carbon is one of the main elements in industrial steel，The properties and structure of steel are largely determined by the content and distribution of carbon in the steel，The effect of carbon is particularly significant in stainless steel。The effect of carbon on the structure of stainless steel is mainly manifested in two aspects，On the one hand, carbon is the element that stabilizes austenite，And to a great extent（About nickel30times），On the other hand, carbon and chromium have a great affinity，Chromic formation—Series of complex carbides。therefore，From the strength and corrosion resistance of the candle from two aspects，The role of carbon in stainless steel is contradictory。 The law of this influence is understood，We can go from different
2015-03-16 Reading quantity 1558
introduction：For specific users，The determination of mold price based on single piece production is very complicated。This paper discusses how to determine the price of mold scientifically and reasonably，For reference and further discussion。 The main characteristics of mold production and the difficulty of determining the price Mold is an important process equipment for industrial production，It is a special tool used to form metal or non-metal materials into products。Because the mold must meet the requirements of its specific users and specific products，So in the vast majority of cases，Mold enterprises must carry out unique design and single production of molds for a variety of specific requirements。In view of this，die
2015-03-16 Reading quantity 2789
introduction：（1）Cleaning heat treatment Waste water from heat treatment production、Exhaust gas、Waste salt、dust、Noise and electromagnetic radiation will cause pollution to the environment。Solve the environmental pollution problem of heat treatment，Perform clean heat treatment（Or green heat treatment）It is one of the directions of the development of heat treatment technology in developed countries。To reduceSO2、CO、CO2、Dust and cinder discharge，The use of coal as fuel has been virtually eliminated，Less heavy oil is being used，Most have switched to light oil，Natural gas remains the most desirable fuel。 The waste heat utilization of combustion furnace has reached a high degree，The burner structure is optimized and empty-The fuel ratio is strict
2015-03-16 Reading quantity 1543
introduction： Electric forklift rental market is also relatively large There is a saying in foreign countries：A wise entrepreneur never deposits large amounts of cash into fixed asset investments，Money only increases in value on the move，Fixed assets only through use（Instead of owning）To create profits。Foreign construction machinery、Aircraft and ship、Various vehicles、Medical equipment、Communication and information equipment, etc，60%The above are sold by lease。 With the development of economy，Logistics handling has penetrated into every aspect of economic life，
2015-03-16 Reading quantity 2794
introduction： Chinas raw materials and pharmaceutical intermediates(The following are collectively referred to as raw materials)It occupies an important position in the international market with its low price,Join in our countryWTOThis is an opportunity for the pharmaceutical industry,It also brings new challenges to the pharmaceutical industry。For all sorts of different purposes,In the past two years, the importing countries of apis have put forward higher requirements for the production process and social responsibility of Chinese pharmaceutical enterprises,As a result, certifications quickly spread across the pharmaceutical industry,Simultaneous Chinese《Good quality control for drug production》(GMP)Certification is also speeding up。The focus of these certifications is on quality for apis、dry、Post contract,desiccation
2015-03-16 Reading quantity 2873
introduction：User macro program is an important function of CNC equipment，Commands such as variable arithmetic and logical operations as well as various conditional transitions are allowed，It makes it convenient and simple to compile some processing programs compared with ordinary methods，It also simplifies the process。When processing some circular curve contour given by mathematical expression，For CNC equipment with only linear and circular interpolation functions，It cant be processed directly，These curves can only be approximated by straight lines and arcs。If the contour node is used to calculate each node approximating the straight line and the arc, the machining program is prepared，Computationally cumbersome，And the number of segments will be large
2015-03-16 Reading quantity 2891
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