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introduction：Cryogenic equipment for the storage and transportation of liquefied natural gas、 Liquid oxygen、 Liquid nitrogen、Containers for liquid hydrogen and liquid helium, etc。For long-term storage of liquefied gas，Effective insulation must be used。The storage tank is usually of double construction。Inner cylinder（Also known as the inner bladder）Storage of liquefied gas，Inner tube and outer tube（Outer gallbladder）An insulating layer is formed between them，To reduce by conduction、convection、Heat radiated into the inner cylinder。 The main performance index of deep cryogenic liquefied gas storage tank is evaporation rate。The evaporation rate is the ratio of the volume of liquefied gas that evaporates due to the introduction of external heat into the storage tank and the rated capacity of the cryogenic liquid stored and transported in the unit time。Evaporation rate due to storage
2015-02-12 Reading quantity 2808
introduction： Cubic structure of boron nitride﹐The molecular formula isBN﹐Its crystal structure(figure1 Cubic boron nitride cell )Diamond like﹐Hardness is slightly lower than diamond﹐forHV72000～98000mpa﹐Commonly used as abrasives and tool materials。1957years﹐ColumbianR.H.Wenthoff first developed boron nitride。But no natural cubic boron nitride has been found so far。 Cubic boron nitride is available in single crystal and polycrystalline sintered bodies。The single crystal is made of hexagonal boron nitride and catalyst under pressure3000～8000mpa
2015-02-12 Reading quantity 2802
introduction：Applicable model：Z28-33（5933），Z28-40，Z28-75，Z28-80，Z28-100，Z28-80A，GWR-80，Z28-200。 one、 Conscientiously implement《General operating rules for forging equipment》Relevant provisions。 two、Conscientiously implement the following supplementary provisions： （one） Check the hydraulic oil storage tank before working，The amount of oil should be sufficient。 （two） Take it seriously at work： 1、Other hydraulic valves are not allowed to adjust without permission except throttling。 2、Install the movable bracket correctly when replacing the roller，Confirm good before
2015-02-12 Reading quantity 2789
introduction： Made of metal or glass、Length measuring and positioning elements accurately engraved with equally spaced parallel lines on the surface，Also known as line ruler。The line spacing of the line ruler is generally1Millimetre or0.1millimeter。Line rule can be divided into reference line rule、Standard and working wire rule。The reference line grain and standard line grain are used to transfer the quantity value of the length measurement。Working wire gauge is used for length comparator、Measuring machine、Universal tool microscope、Used as a measuring element in length measuring tools such as universal measuring machines；In the jig Borer、When used as a positioning element in precision machine tools such as coordinate grinders for measurement or positioning,Want and read the microscope、Optical reading
2015-02-12 Reading quantity 2793
introduction：Equipment overview： With the rapid development of industry and urban construction，Industrial wastewater and domestic sewage are increasing day by day。In order to prevent pollution、Protect the environment，Sewage must be treated。Sludge with high liquid content was produced in sewage treatment，The sludge treatment must be dehydrated first，Otherwise, transportation and comprehensive utilization are impossible。At present, there are many machines used for sludge dewatering，Compared with other sludge dewatering machinery, the belt press filter has、Energy saving and continuous operation，Therefore, its application is becoming more and more extensive。 ↑ DYBelt press filter Working principle： Band pressure
2015-02-12 Reading quantity 2803
introduction：Not all damaged 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。]Can be repaired，But for every damaged bearing consider repairing or replacing it with a new oneINABefore bearing，The cause and extent of damage must be assessed to avoid or minimize re-damage。
2015-02-12 Reading quantity 1451
introduction： Working principle： After the wet material is added to the dryer，Flip down the board stripper evenly distributed in the cylinder，The material is evenly distributed and dispersed in the dryer，Parallel and parallel flow(countercurrent)Full contact with hot air，Accelerated drying heat transfer、Mass transfer。In the drying process，The material is under the action of inclined sheet and hot air flow，Controllable movement to another section of the dryer star discharge valve to discharge the finished product。 peculiarity： Rotary dryer high degree of mechanization，Large production capacity； The fluid has little resistance through the cylinder，Low power consumption； Strong adaptability to material characteristics； Stable operation、Controls
2015-02-12 Reading quantity 2789
introduction：About Semiconductor Lasers(LD)Pu solid laser equipment，Its development and research are very active in the world。 In Japan as“Photon engineering”National projects have been researched and developed10kwMinor(RodType sumSlabtype)equipment。stateside，Act as“Precision laser machining”National project。Research and development3kWLDpumpingSlabA solid state laser device is available20-30mmLarge penetration weld。Because the weld width is very small，Transverse motion of the laser beam can be made to enlarge the melting width。Now developed in GermanyLDPump-thin disk solid-state lasers are most notable for their small size、Of good quality、efficiency
2015-02-12 Reading quantity 2894
introduction：So-called rolling 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。]play，That is, when the rolling bearing is not installed on the shaft or the rolling bearing box，Fasten one of its inner or outer rings，Then make the unfixed side the amount of movement when moving radial or axial。By direction of movement，It can be divided into radial clearance and axial clearance。 Clearance during operation（
2015-02-11 Reading quantity 1448
introduction：PTHThe hole is broken（colloquially：Keep a mistress） Etched slope fracture overerosion Glass fiber pulling Drill a needle to cut through the wall The roughness of the hole wall causes the hole to break
2015-02-11 Reading quantity 2802
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