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introduction：1、VAVHow the end works The amount of cold into the room is determined by pressing the formula： Q=C.ρ。L（tn-ts）（1） ShizhongC—The specific heat capacity of air，KJ/（Kg.°c）；ρ—Air density，Kg/m3；L—Blast rate，m3/S； tn—Room temperature，°c；ts—Supply air temperature，°c；Q—absorb（Or in）Indoor heat，KW. If you set the supply air temperature to a constant，Change the air supply volumeL，You can get different onesQvalue，To keep room temperature constant
2015-01-11 Reading quantity 2874
introduction：SKFbearing[SKFbearing:SKFThe full name is“Svenska Kullager-Fabriken”The Chinese transliterated name is“SKF”；SKFThe group is headquartered in Gothenburg, Sweden，Is a leader in bearing technology and manufacturing。SKFBearings can be divided into sliding according to different specific structures and similarities and differences in working propertiesSKFBearing and rollingSKFbearing]In the course of its use, it shows strong regularity，And repeatability is very good。Normal high-quality stainless steel bearings at the beginning of use，Vibration and noise are relatively small，But the spectrum is a little scattered，The amplitude is small，May be due to the system
2015-01-11 Reading quantity 1556
introduction： [Content summary]In this paper, the source code of macro program of turning cycle is studied，A deeper understanding of the execution details of turning cycle instructions，The understanding of instruction parameters is improved，The method of determining coordinates for key points in programming is clearer，Some issues have been clarified。Some misconceptions have been corrected，So that we can better use the turning cycle instructions。 [keyword]macroprogram、order、sign、Cutting depth、coordinate In the teaching of numerical control programming，We generally prefer
2015-01-11 Reading quantity 2905
introduction：A rotary pump that relies on the change of working volume formed between the pump cylinder and two adjacent blades on the rotor when the eccentric rotor rotates to transport liquid or pressurize it(Sight-seeing pump)。Vane pump blades rely on centrifugal force（A spring or high pressure liquid can also be placed at the bottom of the blade）Stick to the inside surface of the pump cylinder，And in the rotor slot for reciprocating sliding(See picture[Slide pump diagram])。Rotor time，The working volume between two adjacent blades on the suction cavity side increases gradually,Pressure reduction,The liquid enters the working volume under the action of pressure difference。Working volume through a transition zone（Refers to the working volume is not connected with the suction cavity and the discharge cavity of the section）Taper off，And drain the liquid
2015-01-11 Reading quantity 2808
introduction： Smelting in metallurgical industry﹑Ingot casting﹑roll﹑Various machinery and equipment used in the handling and packaging process﹐Also known as metallurgical equipment。Metallurgical processes are complex﹐The corresponding metallurgical machinery is characterized by large structure﹑Large energy consumption﹑Production continuity﹑Strong complete set of equipment。Metallurgical machinery is mostly at high temperature﹑dusty﹑Continuous operation under heavy and corrosive conditions﹐Must meet﹑reliable﹑secure﹑Durability and energy saving requirements。The general development trend of metallurgical machinery is large-scale﹑serialization﹑High speed and automation﹔We also need some small ones
2015-01-11 Reading quantity 2838
introduction：story，Recently, there are so many customers consulting on Silver rail，All the time，The silver guide rail is in great demand in the market，Compared to other products in Taiwan，It debuted early，So the market share is still huge。
2015-01-11 Reading quantity 20010
introduction：Basic concept：Tool steel refers to the manufacture of cutting tools、Measuring tool、Die and resistance to high temperature softening spring、Bearing of all kinds[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。]And some wear parts such as steel。Usually divided into carbon tool steel、us
2015-01-11 Reading quantity 1458
introduction：Shandong Phoenix Pharmaceutical Co., LTD (Dongying City 257400) Xu Jingfang Sinopec pipeline storage and transportation company Dongying first station (Dongying City 257067) Li Changyin Shengli oilfield Tianfeng technology industry and trade limited liability company (Dongying City 257000) Zhang Baoling picks to：By simulating the actual welding test,The effect of spray welding layer on crack sensitivity of nickel base alloy was studied。The result shows that,The composition of nickel-base alloy spray welding layer has obvious influence on the crack sensitivity of austenitic stainless steel weld。The thicker the spray welding layer,That is, the more components of the spray welding layer melted in the weld,Weld gold
2015-01-11 Reading quantity 2877
introduction：In the electromagnetic mechanism，Attracted by a fixed electromagnet，And after the movement and the electromagnet to form a closed magnetic circuit，This moving ferromagnet is called“armature”，For example, the upper part of the common AC contactor drives the contact。 This principle is also used in brakes and clutches, as well as some electric mechanisms。 Small electromagnetic brakes have simple brake pads driven by the armature，Bigger brake and clutch，You have to use a suction cup。 Such armature finally constitutes a closed magnetic circuit，If its a bad closure，It will cause too much current in the electromagnetic coil，A short time is a noise，Too much time will burn the coil。
2015-01-11 Reading quantity 2820
introduction：A heat exchanger with a small diameter fluorine plastic hose as a heat transfer element，Also known as flexible tube heat exchanger。Commonly used fluoroplastics are polytetrafluoroethylene and polyperfluorinated ethylene propylene。1965The United States first applied this heat exchanger in industrial production。therewith，China、Japan and European countries also started manufacturing。Fluoroplastic heat exchangers are mainly used for working pressure（3～4）×10(Mr、 Operating temperature at200℃The following kinds of highly corrosive media for heat transfer,Such as sulfuric acid、Highly corrosive chloride solution、Cooling or heating of acetic acid and caustic media。 Structure The structure of this heat exchanger is shell-and-tube type
2015-01-11 Reading quantity 2799
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