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introduction：axis Installed above the factory building, a single engine drives the long shaft of several working machines(See picture Shaft drive diagram )。Similar ones mounted on the ground are called earth shafts。The shaft is driven by a power engine﹐Then drive multiple intermediate shafts﹐Then drive each working machine separately。The intermediate shaft is usually equipped with two belt wheels of equal diameter﹐One of them is attached to the shaft﹐The other one is spinning over the axis。When the drive belt is on the fixed pulley﹐The working machine is driven﹐When the belt is on the idling wheel﹐The machine stops moving。The transmission between the intermediate shaft and the working machine can also use the tower wheel﹐To achieve speed regulation。Skyshaft has been widely used to drive machine tools。Most modern
2015-01-11 Reading quantity 2831
introduction：Nibco is the largest manufacturer of pressure rated ductile iron valves in the United States。Nibco multi-turn valves are ideal for many applications：hydrocarbon，chemical，boats，Fire prevention，A place where cast iron or cast steel valves can be installed in industries such as pulp and paper。 As an alternative to steel，1949Man developed ductile iron。Cast steel contains less carbon0.3%，The carbon content of cast iron and ductile iron is at least3%。The low carbon content in cast steel prevents the carbon present as free graphite from forming structural flakes。The natural form of carbon in cast iron is free graphite flakes。Inside the ductile iron，
2015-01-11 Reading quantity 2953
introduction： The ratio of the centrifugal force on the suspension or emulsion in the centrifugal drum to its gravity in the centrifugal force field﹐Thats the ratio of centrifugal acceleration to gravitational acceleration。Separation factorFrexpression﹕ ShizhongR Is the radius of the position of the separated material in the drum(meter)﹔ωIs the rotational angular velocity of the drum(radian/seconds)﹔ gAcceleration of gravity(9.81meter/seconds2)﹔ nIs the rotating drum speed(turn/points)﹔ mFor the quality of the material inside the drum(kilogram)。Separation factor is the main index to measure the performance of centrifugal separator。Fr bigger﹐The more the centrifugal separation forces
2015-01-11 Reading quantity 2847
introduction：In order to ensure that the measurement results of textile instruments are accurate and consistent，Make its quantity value stable within a certain tolerance range，When purchasing and using instruments，Full attention must be paid to its good metrological performance，Perform necessary metrological verification。Such as： ⑴An instrument often has several ranges to choose from，The error at both ends of the indicating range of general instruments is large，So depending on who youre testing，Should choose reasonable、Moderate instrument range。 ⑵Precision of the instrument（Precision for short）It is a comprehensive reflection of instrument random error and system error，To obtain the correct measurement results at the same time，An instrument of the appropriate accuracy level must be selected
2015-01-11 Reading quantity 2850
introduction：1、The generation of higher harmonics General voltage in380~500VLow-voltage frequency converter，Its main circuit are used“Hand in－straight－Hand in”line，And its voltage type，Its input has a rectifier circuit，For outputIGBTInverter circuit，So the input voltage is sinusoidal，The current is a non-sinusoidal waveform；The output voltage is non-sinusoidal（stepped）Wave form，Approximate sine of current（SPWMmodulation）。 In short，There are non-sinusoids in both input and output，It produces higher harmonics。Especially the output influence is greater。Per-converter capacity≤10Power transformer capacity，The impact is small。
2015-01-11 Reading quantity 2980
introduction：Content summary:Many people have experienced this situation：Users repeatedly stressed the urgency of time，I hate to get the parts we ordered tomorrow。however，These parts must use bending molds that are not part of their own equipment，You cant buy them ready-made。So you think“Custom mold”Hows that。For a short time，Can be manufactured Many people have experienced this situation：Users repeatedly stressed the urgency of time，I hate to get the parts we ordered tomorrow。however，These parts must use bending molds that are not part of their own equipment，You cant buy them ready-made。So you think“Custom mold”Hows that？in
2015-01-11 Reading quantity 2829
introduction：compensate（offset）The concept is used a lot in our life，Such as，The motorist was driving his car around a rock，He was going to steer the car around the rock on its side，And he has to take into account that cars have a certain width，So keep the centerline of the car at least half a car width away from the stone。in20century60～70In the era of CNC machining, there is no concept of compensation，Therefore, programmers have to program around the relative relationship between the theoretical route and the actual route of the tool，error-prone。The concept of compensation has greatly improved the efficiency of programming。 In CNC machining there are3Kind of
2015-01-11 Reading quantity 2906
introduction：1、Feel the bearing through the surface[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。]Quality In the process of selling bearings, I found that many customers said that as long as the surface of the bearing is bright, the quality is good，This is wrong。The light of the bearing surface should be a kind of dark light，The reason for this dark is whether the steel used in the bearing is up to standard and its grinding process
2015-01-11 Reading quantity 1475
introduction：At present，CTPThe field is still thermal sensitive and purple laser technology coexist。however，Violet laserCTPThe development is more dramatic。More and more enterprises began to invest in the research of this technology，Because they think，The future printing equipment market will be dominated by Purple LaserCTPtechnology-led。 Violet laserCTPTechnological advantage Ever since2000years5After the purple laser light source was officially introduced to the market in October，Always thought soCTPThe most advanced thermal light source in the equipment is severely challenged。The advantages of this new light source，Attracted a large number of users。 faster Violet light source relative to other commonly usedC
2015-01-11 Reading quantity 2844
introduction：five、Carbon steel and ferroalloy surface treatment methods [method1] Common degreasing solvent：trichloroethylene、acetone、Ethyl acetate、gasoline、benzene、Anhydrous ethanol。 [method2] Degreasing after sandblasting or emery cloth grinding。 [method3] in10%Water glass in aqueous solution60°CBottom retting10-15min，Then wash，desiccation。 [method4] in18%Macerate in aqueous hydrochloric acid at room temperature5-10min，Rinse with cold water，Rinse with distilled water，coexistence93
2015-01-11 Reading quantity 2920
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