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introduction：Characteristics of liquid nitrogen and mechanism of liquid nitrogen quick-freezing preservation Liquefied nitrogen gas———Liquid nitrogen，It is a colorless transparent liquid with low viscosity，Chemically stable，The boiling point of liquid nitrogen at atmospheric pressure is77．35K。No chemical reaction with poultry food ingredients，Meet the requirements of food hygiene，It is an ideal freezing preservative。The amount of nitrogen in the air is about78％，So in the atmosphere around the Earth，There is an inexhaustible supply of nitrogen。 At atmospheric pressure，Liquefied nitrogen occurs when the liquid phase changes into a gas phase，The average latent heat of evaporation to be absorbed per kilogram of liquefied nitrogen is199．29Kilojoule (kJ)，recause77．
2014-12-21 Reading quantity 2806
introduction： Whether the datum surface is selected accurately or not will directly affect the machining accuracy of the workpiece，The specific selection principles are as follows： (1)In general，The surface with less surface roughness should be selected as the base surface。 (2)When grinding surfaces of varying sizes，The large area should be chosen as the benchmark，This will hold the clamp firmly，And it is beneficial to achieve parallelism requirements by grinding away less margin。 (3)In parallel surface visible position tolerance requirements，The surface of the workpiece with small form and position tolerance or the surface that is conducive to the requirement of form and position tolerance should be selected as the reference surface。 (4)The root
2014-12-21 Reading quantity 1477
introduction：Reduction gear_Heilongjiang reducer_Worm gear reducer_Worm reducer_ www.hljjsj.cn. The whole transmission device of planetary cycloidal pin gear reducer can be divided into three parts：Input part、Retarding section、Output part。There is a misalignment in the input shaft180°The double eccentric sleeve，The eccentric sleeve is fitted with two roller bearings called swivel arms[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，To reduce power transmission
2014-12-21 Reading quantity 2802
introduction：A slide on an engineKOYOThere are many kinds of bearings，Both the bushing and the bearing are slidingKOYObearing。In order to ensure the accuracy of engine operation，These slidesKOYOBearing clearance requirements are also very high。Engine slipKOYObearing[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
2014-12-21 Reading quantity 1471
introduction：The choice of the lubrication method and lubricating grease of the machine tool is based on the structure of the machine tool、Degree of automation、The working conditions of the machine tool and the requirements for precision are comprehensively measured to make a decision，The lubrication of machine tools should avoid temperature rise and vibration while reducing wear and consumption。Machine tools are complex and precise machines，A variety of drives will be used，Depending on the type of device、The working environment and the required precision require the viscosity of the lubricating oil、Oil resistance to oxidation、Extreme pressure resistance and other related properties have different requirements。 one、Requirements for machine lubrication： 1、 The machine has more lubrication points
2014-12-21 Reading quantity 2807
introduction：three、The main environmental factors affecting the service life of corrugating roller： 1．Product impact： (1)Sand content of corrugated paper，The larger the sand content, the greater the abnormal wear of the corrugated roller。 (2)The shape and thickness of corrugated paper(Gram weight)。The smaller the mold and the thicker the paper，The faster the normal wear of the corrugated roller。 (3)Often produced paper webs(Wide and narrow production ratio)，The more narrow range is produced，Cause corrugation roller uneven wear and concave。Conditions should be as narrow as possible by both ends of the corrugated roller production。 2．Impact of equipment： (1)Equipment operating speed
2014-12-21 Reading quantity 2868
introduction： In the rapid development of science and technology today，The computer has evolved from a high-speed computing tool to a powerful assistant in product design，It is widely used in product manufacturing industry，The corresponding design software also came into being。By Dassault France（Dassault Systemes）company-launchedCATIA，Its mainstream in the worldCAD/CAE/CAM Integrated software。This paper describes the utilizationCATIASoftware modeling method and theoretical basis，The design of a part of the body of a vehicle is taken as an example，Summarize some experience and skills of using this software。 one、summarize
2014-12-21 Reading quantity 2819
introduction：Mechanical seals are widely used in all types of pumps。Mechanical seal is a kind of sealing device with high precision，There are certain requirements for installation and use conditions。 1、 General principles for installation and use of mechanical seals （1）Find out about the equipment，To understand the rotation speed of the equipment shaft、Shaft diameter；Equipment manufacturing accuracy and sealing cavity size，The service life of the equipment itself and the position of the equipment in the production process should be considered comprehensively and balanced。 （2）Estimated medium pressure。The seal chamber pressure of the pump is generally not the outlet pressure of the pump，Its lower than the outlet pressure of the pump （3）Find out the sealing medium。Know the sealing medium
2014-12-21 Reading quantity 1465
introduction： In order to judge the removedFAGImported 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。]Can it be reused?，It is important to check its dimensional accuracy、Rotation accuracy、Internal clearance and mating surface、Raceway surface、Cage and seal ring, etc。 About the test results，It can be judged by those who use habitual bearings or are proficient in bearings。 The standard root of judgment
2014-12-21 Reading quantity 1498
introduction： Selection of performance parameters： 1.Flow rateQ： As a positive displacement pump，The main factors affecting the flow rate of double screw pump are speedn，stressp，And the viscosity of the mediumv。 1.1 Rotational speed n Influence of： Screw pump at work，A sealing cavity is formed between the two screws and the bushing，Each time the screw rotates, a sealing chamber is moved from the inlet to the outlet，That is, a sealed cavity volume of liquid is drained out。ideally，There is no leakage inside the pump，Then the flow of the pump is proportional to the speed。namely： Qth=n*q n----Rotational speed； q----Theoretical discharge，That is, every revolution of the pump
2014-12-21 Reading quantity 2822
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