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introduction：1Pickling corrosion of aluminum fin of air cooler There are more air coolers in aromatics combined unit of a petrochemical plant，Carbon steel tubes carry hydrocarbons，The aluminum fin outside the pipe is cooled by the fan。After long running，The aluminum fins are grimy and greasy，Affect cooling effect，Need to spray clean，Used to use5％HCl+Lan826+Surfactant or5％HNO3+Lan826+surfactant；But the aluminum fins are not shiny，To this end, add a small amount to the above cleaning agentHF.By spraying，Although aluminum fin surface“Take on a new look”，But a closer look at the aluminum fins has been severely corroded，Some are even as thin as paper。 2Titanium copper reheater chemistry
2015-01-24 Reading quantity 1454
introduction：The influence of acoustic properties of the material itself or defects on ultrasonic propagation，A nondestructive testing method used to detect defects or certain physical properties of materials。 The principle of ultrasound is higher frequency20Mechanical waves at kilohertz。The frequency commonly used in ultrasonic inspection is0.5～5Megacycle (MHZ)。This kind of mechanical wave can travel in a certain speed and direction in the material，Encounter heterogeneous interfaces with different acoustic impedances（Such as defects or the underside of the object under test）It creates a reflex。This reflection can be used for ultrasonic detection，The most commonly used method is pulse echo flaw detection(See picture[Schematic diagram of pulse echo flaw detection method
2015-01-24 Reading quantity 2798
introduction：JapanKOYOPrinciple requirements for bearing inner packing method： ①Miniature 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。]：every10～15The sleeve bearing goes into a plastic cylinder，every5～10A plastic tube goes into a cardboard box（Or bag、packaging）。 ②In the、Small bearing： Polythene film for multiple sets of bearings、External cattle
2015-01-24 Reading quantity 1558
introduction：With the increasing popularity of CNC machining，CAD/CAMThe software is constantly updated，Numerical control programming for multi-axis machining has always been a key technology in aero engine blade machining。MastercamAs a high-endCAD/CAMsoftware，It has a wide range of applications in practical processing，The following isMastercamPractical application in four-axis machining of blade，It also has reference significance for other surface machining。 keyword lamina&nb
2015-01-24 Reading quantity 2749
introduction： 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。]It is a fixed part in the machinery，Is the main body of machinery，Its function is basically to keep the shaft centered，And the machinery that controls that movement。IKOBearings play an important role in any machinery，If there is no bearing，Mechanical ready
2015-01-24 Reading quantity 1570
introduction：1. 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。]Installation environment Imported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，Of course, the price is not cheap。]The installation is to be in
2015-01-24 Reading quantity 1545
introduction： High chromium ball quality index： Chromium content≥10.0%、Carbon content in1.80%-3.20%Between are called high chromium balls，National standards require high chromium ball hardness（HRC）must≥58above，Impact valueak≥3.0J/㎝2，If this hardness high chromium ball must be quenched at high temperature＋tempering（At present, there are two kinds of quenching methods for high chromium ball quenching in China: oil quenching and air quenching），Such as testing hardness（HRC）Lower than54The following indicates that the high chromium ball has not been quenched。 two、Medium chrome ball quality index： Chromium content3.0%～7.0%，Carbon content in1.80%
2015-01-24 Reading quantity 1459
introduction： Tapered roller bearings[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。]Analysis is as follows： 1.This type of bearing is equipped with a round table roller，The roller is guided by the large flange of the inner ring 2.Designed to make the inner raceway surface、The apex of each cone of the outer ring raceway surface and the roller rolling surface intersects at a point on the bearing center line 3
2015-01-24 Reading quantity 1566
introduction：A cylindrical combustion chamber that uses a high-speed rotating air flow to make coal particles rotate at a high speed and burn strongly（furnace）。Cyclone furnaces can be used for boilers and other equipment。The high-speed rotating action of the air stream throws the coal particles towards the wall of the cylinder，The coal particles burn in the space near the wall and the wall of the cylinder，Forming a very hot zone，The ash melts and sticks to the wall of the cylinder。There is a high relative velocity between the air flow and the coal particles adhering to the liquid slag film，Encourage the fuel to mix well with the air，Therefore, the cyclone furnace has a high combustion intensity。 Cyclone furnace according to the structure can be divided into horizontal and vertical two kinds。①Horizontal cyclone furnace:The horizontal cyclone furnace for axial coal intake（figure1[horizontal
2015-01-24 Reading quantity 2797
introduction：(1)Rolling bearings with low noise requirements[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。] In the standard bearings produced in our country，Some single-row radial ball bearings and short cylindrical roller bearings have low noise varieties for motor bearings。Which ball bearing from inside diameterφ2.5mmtoφ60mmThere are several varieties of beltsZl、Z2
2015-01-24 Reading quantity 1671
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