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introduction： Flow coefficient and cavitation coefficient of valve are important parameters of valve，This can generally be provided in the valve data produced in advanced industrial countries，Even printed it in the sample。The valves produced in our country basically do not have this information，Because obtaining such information requires experiments to come up with it，This is one of the important manifestations of the gap between China and the worlds advanced level of valves。 3.1、Flow coefficient of the valve The flow coefficient of the valve is an index to measure the flow capacity of the valve，The larger the flow coefficient is，The lower the pressure loss when the fluid flows through the valve。
2015-04-07 Reading quantity 2858
introduction： A grinder that grinds the surface of a workpiece with a pestle coated or embedded with abrasive。It is mainly used for grinding high-precision surfaces in workpieces﹑Inner and outer cylinder﹑Conical surface﹑sphere﹑Thread faces and other profile faces。The main types of grinding machines are disc grinding machines﹑Rotary shaft grinding machines and various special grinding machines。 ①Disc grinder﹕There are single disc and double disc two kinds﹐The application of double disk grinding machine is most common。In a double disk grinder(See picture Double disk grinder)Up.﹐Multiple workpieces are placed on top simultaneously﹑Lower grinding disc between the cage inside﹐Cages and workpieces are driven by eccentric or planetary mechanisms
2015-04-07 Reading quantity 2773
introduction： A heavy-duty boring machine for boring and milling large workpieces fixed to a floor platform。In actual use﹐Milling is usually more work than boring﹐It is also called ground milling and boring machine﹐Mainly used in heavy machinery manufacturers。(See color diagram FB 260CNC floor boring and milling machine﹑ 5Millon planer milling machine ready for processing FB260Type floor boring and milling machine for welded steel structure columns) Floor boring and milling machine(See picture Structure of floor boring and milling machine)There is no movable workbench﹐The workpiece is fixed on the landing platform﹐Suitable for processing large size and weight of the workpiece。The headstock hangs from the column
2015-04-07 Reading quantity 2780
introduction： IKObearing[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 function of coordination is to makeIKOThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(usuallyIKOBearing block)And rotating part(Usually an axis)Solidify together，Thus, the load is transferred in the rotating state and the motion system is limited relative to static
2015-04-07 Reading quantity 1548
introduction： 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。]Should be based onINABearing size，specification，And speed and so on to chooseINAWhether the bearings meet our mechanical range of use，Here is a simple analysis： First up is the， Size limitation。 usualI
2015-04-07 Reading quantity 1454
introduction： The cutting of workpieces in water。Underwater cutting is mainly used in Marine rescue and nuclear contamination of structural parts in water disintegration。Underwater cutting can be divided into underwater thermal cutting according to the principle of cutting﹑Underwater explosive cutting and underwater mechanical cutting 3class。 Underwater thermal cutting One of the most widely used cutting technologies in water construction﹐Accounts for approximately the total amount of underwater cutting90％above。Underwater thermal cutting methods are 4Kind of。①Flame cutting﹕Water flame cutting uses hydrogen as a flammable gas。Acetylene in water depth15It is caused by decomposition under pressure of about meters
2015-04-06 Reading quantity 2795
introduction：Using arc as heat source﹑Welding method using gas shielding molten pool。The main function of the gas is to protect the molten metal from oxygen in the air﹑nitrogen﹑The effects of harmful elements such as hydrogen and water﹐But it also has an effect on arc stability﹑The droplet transition form and the activity of the molten pool have some influence。therefore﹐The use of different gases will produce different metallurgical reactions and process effects。The main feature of gas shielded arc welding is visible arc﹐Small weld pool﹐Easy to realize mechanization and automation﹐High productivity。20century70Years of rapid development of welding
2015-04-06 Reading quantity 2803
introduction： Magnesium and aluminum are both light non-ferrous metals，The main physical properties of magnesium are shown in the table1，It is characterized by a small specific gravity(1.7g/cm3)，Smaller than aluminum；The coefficient of specific heat and expansion is larger(ferrotropic1times，Also higher than aluminum)；The modulus of elasticity is the lowest among common metals。Magnesium is very chemically active，A protective oxide film can also be formed in the air，But the membrane is brittle，undense，Far less solid than aluminum oxide film，So magnesium has very poor corrosion resistance。 Pure magnesium has lower mechanical properties(Deformed stateσb=200MPa,σs=90MPa,δ=11.5,ψ=12.
2015-04-06 Reading quantity 2789
introduction：What is the application and maintenance of the vibration roller reducer。The product has formed a standard and series after long-term production practice，So far has been put into production and use of the reducer power range：110 kW、220 kW、315 kW、450 kW、500 kW、560 kW、630 kW、710 kW、800 kW、900 kW。PBZFSeries reducer has the following technical characteristics introductionPBZFSeries reducer is a heavy-duty reducer designed for the cement industry by Xi an Heavy Machinery Research Institute，Ever since1990Starting for the roller press matching
2015-04-06 Reading quantity 2802
introduction：Strong metallic sound 1、Abnormal load：Select appropriate assembly clearance and preload 2、Poor assembly：Improve the machining accuracy of the shaft，Improved installation method 3、underlubricant：Supplement or use suitable lubricant Regular tone 1、Foreign bodies cause channel rust、impression、scar：Cleaning related parts，Use clean grease 2、The channel is peeling off：Fatigue wear，switchFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。] heterophony 1
2015-04-06 Reading quantity 1581
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