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introduction： 1Presentation of problem Matou power plant#7Machine design2Table condensate pump,The original model is14NL-14type,The main parameters are as follows:Flow rateQ=510m3/h,headH=140m，Rotational speedn=1480r/min，Motor power278kW，efficiency70，Cavitation allowance2.0m。 This type of condensate pump has the problem of insufficient output in long-term operation，The knock-on problems are as follows。 a.To ensure condensate flow，Meet the water requirements to the deaerator，Maintain deaerator water level，In operation, the deaerator only adopts the operation mode of low pressure limit（
2015-03-16 Reading quantity 2826
introduction： The slab and the mandrel rotate together，Feed and apply pressure by roller wheel，Stamping process in which the slab is deformable locally and point by point against the mandrel（See picture[Spinning principle]）。Spinning can produce a variety of axisymmetric rotating parts，loudspeaker、Missile body、High pressure vessel head、gong；Can also be used for gas cylinder closure、Billet forming, etc。The characteristics of spinning are：Large workpieces can be formed with a small deformation force；The equipment is relatively simple to use，Small and medium size sheet parts can be spun by ordinary lathe；Simple mold，All you need is a mandrel，Low material requirements。Spinning is suitable for small batch production,Due to the
2015-03-16 Reading quantity 2821
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 2830
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 2824
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 2862
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 1558
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 1555
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 2788
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 1539
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 2793
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