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introduction：Its acid-catalyzed2,2-dimethoxypropane（DMP）The temperature titration of water as a reagent is a better method than traditional Karl Fischer（KF）The method is superior to titration。withKFReagent comparison，DMPHave stability、hypotoxicity，It can also be applied to a wider range of titration experiments。 1.intro When the acid is added to the catalyst，2,2-dimethoxypropane（DMP）A strong endothermic reaction occurs immediately with water，The reaction formula is as follows： H+ CH3C(OCH3)2CH3+H2O&nb
2015-03-03 Reading quantity 2883
introduction：1General rules1.0.1In order to ensure the installation quality of low-voltage electrical appliances，Promote the progress of construction and installation technology，Ensure the safe operation of the device after installation，Formulation of this specification。1.0.2This specification applies to communication50HzRated voltage1200VAnd below、The rated DC voltage is1500VAnd the following general low-voltage electrical apparatus installed and adjusted under normal conditions test。Not applicable to household appliances that do not require fixed installation、Power systems protect electrical appliances、Electrical instrument、transmitter、Electronic computer system and disk sets、ark、Installation and acceptance of electrical equipment on the box。1.0.3Installation of low voltage electrical appliances，It shall be as approved
2015-03-03 Reading quantity 2784
introduction：TIMKENbearing[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。]After installation，To check that the installation is correct，An operational check is required。Small machines can be turned by hand，To make sure the rotation is smooth。Check items for foreign bodies、scar、Poor operation due to indentation，Due to poor installation，The force caused by poor processing of the mounting seat
2015-03-03 Reading quantity 1437
introduction：Humans have a long history of building ships。From prehistoric beginnings﹐For a long time, humans built wooden boats that were propelled by hand or wind。1807years﹐Fulton, USA﹐R.Built the worlds first steam-powered ship﹐Paddle wheel propulsion was used。1879years﹐The worlds first steel ship was built。Since then, the ship has entered the main steel ship﹑The age of machine power。from20century50From this era﹐Steam turbines and diesel engines are gradually replacing steam engines in ship propulsion﹐And began to use nuclear power for propulsion
2015-03-03 Reading quantity 2792
introduction：1、KOYOImported 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。]upkeep：To maintain it in good condition for as long as possibleKOYOImported 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。]Inherent performance，Must be maintained、overhaul、In order to
2015-03-03 Reading quantity 1446
introduction：①Chemical components are represented by international symbols for chemical elements and national symbols，Use Arabic letters to indicate the content of ingredients： Such as：China、Russia 12CrNi3A ②A fixed digit number to represent a steel series or number；Such as：America、Japan、300Department of、400Department of、200Department of； ③Use Latin letters and order to form serial numbers，Use only。 Numbering rules of our country ①Use element notation ②use、Chinese pinyin，Open-hearth steel：P、 Rimmed steel：F、 Killed steel：B、A-class steel：A、T8：,8、GCr15：ball
2015-03-03 Reading quantity 2898
introduction：0 lead said In the hydraulic system，The traditional pressure regulating circuit can only make the working pressure of the oil circuit not exceed a certain pre-adjusted value or keep the pressure in the oil circuit constant。This voltage regulation method belongs to static voltage regulation，That is, the voltage regulation must be carried out before the system works。When the hydraulic circuit is in operation，Its working pressure requirements are real-time with the size of the load、Change quickly and accurately，That is, when it is dynamically adjusted，The traditional voltage regulating circuit can not meet the requirements，The dynamic adjustment of the oil pressure of the oil circuit can be realized by combining the stepper motor and the pressure reducing valve。1 Stepper motor features Different from ordinary motors，Stepper motor rotation is carried out step by step
2015-03-02 Reading quantity 2794
introduction： The development of water treatment technology and equipment should focus on strengthening the following water pollution prevention and control equipment： （1）Urban sewage treatment equipment In order to implement the principle of strengthening centralized governance，In recent years, significant investment has been made in the construction of municipal sewage treatment plants。Processing capacity should be developed5～50wanm3/dThe city sewage treatment equipment，Focus on the supply of complete sets，Improve the level of self-control and energy-saving indicators。In urban sewage treatment，In addition to the traditional activated sludge method represented by general exposure，According to market demand，Oxidation ditch activated sludge method should be developed、A2/OActivated sludge process、SBRlive
2015-03-02 Reading quantity 2789
introduction： 1.Single row angular contact ball 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。]Single row angular contact ball bearings have the following structural forms： (1)Separate type angular contact ball bearing This bearing is code-namedS70000，The outer ring has no locking edge，Can be with inner ring、cage、Nettle ball
2015-03-02 Reading quantity 1476
introduction： above： FSSeries square screen，It is a new generation of sifting equipment developed by our factory，The machine is unique to it、Energy conservation、Low noise and other complaints are welcomed by the majority of users，Widely used in medicine、Chemical engineering、Various materials in food and other industries are continuously screened，According to user needs can be made1－4Screen layer。 The machine has a simple structure，Easy to operate、Small size、Large processing capacity、Low noise、anti-corrosion、Low fault、Long life、High production efficiency、Adjustable amplitude、Low energy consumption、Easy disassembly、Clean no dead ends、No dust flying characteristics。 principle： The upper part of the machine adopts quick disassembly type
2015-03-02 Reading quantity 2883
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