冷板冷藏车故障分析及维修保养

冷板冷藏车是食品配送的主要工具。冷板冷藏车出现故障,导致制冷机组不工作或是制冷量不足,使货箱温度达不到标准,将直接关系到所运送食品的安全问题。因此冷板冷藏车的维修及保养非常重要。本文对某公司2辆使用不同制冷剂的冷板冷藏车进行了详细的故障原因分析,并对冷板冷藏车的维修及保养进行了探讨。     

我国冷藏车发展概况及前景

分析了我国食品冷藏链的现状,介绍了冷藏车的发展概况,提出了发展我国冷藏车的建议,其对我国冷藏车的设计与运行管理具有一定的参考价值。     

解决方案之冷链系统测试案例

<正>案例1:为顺丰速运有限公司开展冷藏车检测业务冷藏车是用来运输冷冻或保鲜货物的封闭式运输车,是安装有制冷装置和聚氨酯隔热厢的冷藏专用运输汽车,常用于运输冷冻食品(冷冻车)、奶制品(奶品运输车)、蔬菜水果(鲜货运输车)、冷藏药品(医药、疫苗运输车)等。冷藏车是冷链物流的重要一环,是衡量国家冷链发展水平的重要指标之一。目前,顺丰冷运自有冷藏车497辆,其中,270辆食品冷藏车、227辆医药     

冷藏车操作方法的研究

冷藏车是低温冷链物流中的一个重要环节的关键设备。正确的操作方法可使冷藏车在冷藏运输过程中工作可靠、性能发挥稳定,是保证易腐、保鲜食品在运输过程中的安全性的关键环节,还可以使制冷机组达到节能的效果。本文详细的论述了冷藏车的操作方法。     

冷冻冷藏

<正>《道路运输食品冷藏车应用选型技术规范》审查会召开10月13日,由全国物流标准化技术委员会组织的《道路运输食品冷藏车应用选型技术规范》行业标准(计划批准文号:发改办经贸[2012]3133号)审查会在北京召开。标准制定后对冷藏车市场的规范起到进一步引导作用。相关人士表示,在冷链物流产业快速发展的     

冷冻冷藏

<正>冷藏车最新国家标准7月1日正式实施冷藏车最新国标《道路运输、食品与生物制品冷藏车安全要求及试验方法》(标准号:GB29753—2013)已于2015年7月1日开始实施。新国标根据冷藏车厢体内可以达到并且保持的温度进行分类,以保证不同用途和要求的货物运输安全。这也是我国冷藏车制造标准中首次按厢体内可以达到的温度对冷藏车进行分类。据了解,冷藏车的分级有A到H共8个级别。如冷冻肉类、蔬菜水果类因对温度要求不同需要采用不同级别的冷藏车。     

蓄冷技术在食品冷链物流中的研究进展

目的 研究蓄冷技术在食品冷链物流中的应用进展, 提出仍需解决的问题。方法 综述了蓄冷技术应用于蓄冷板冷藏车、 蓄冷型保温运输箱、 控温包装、 低温仓储冷库等领域的研究进展, 同时对食品冷链用蓄冷剂的相变温度、 相变潜热、 用量等相关参数及其与微胶囊等技术的复合研究进行了论述。结果 蓄冷技术在食品冷链的各环节中都具有广泛的应用背景和节能潜力。结论 蓄冷材料本身、 蓄冷板冷藏车、 蓄冷式多温共配技术等是今后蓄冷技术在食品冷链物流中应用的研究方向。     

蒸发温度自动调节技术及其在冷藏车上的应用

针对现有食品冷藏车由于蒸发温度不可自动调节而导致冷鲜果蔬结冰、冻伤和脱水等问题,提出一种蒸发温度可以根据设定温度自动调节的解决方案,其通过改变膨胀阀流量实现不同的蒸发温度.具备蒸发温度可以自动调节制冷系统的冷藏车,不但高效节能,还可以从根本上解决一车多用和一车多温的问题,降低油耗和排放.     

冷藏车开门时车内温湿度变化实验研究

配送过程中冷藏车开门时的热质交换会引起车内空气温湿度的剧烈变化,这使得食品的品质难以得到保证.针对目前冷藏车开门卸货时存在的一些问题,进行了对比实验,对不同条件下的车内温度、相对湿度变化进行了分析,得出在开门时长一定的情况下车厢内外空气温差是影响车内温升的主要因素,采用PVC门帘可以有效地抑制车内温度升高,一定程度上保证食品安全.     

公路冷藏车技术的研究进展

近年来,随着我国国民对食品质量和安全的关注度逐渐提高,以及电商和物流行业的飞快发展,均对冷藏车的发展提出了更高的要求。本文首先介绍了冷藏车的发展历程,分析了其应用现状,并重点关注了冷藏车制冷机组的动力来源、制冷方式和厢体的温度场分布3个方面的研究现状。最后基于公路冷藏车发展的现状,指出了我国冷藏车节能高效、清洁可持续、信息化的发展方向,对冷藏车未来的研究与开发工作具有一定的参考价值。     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.