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1.
为了充分发挥立筒仓科学储粮的功能,介绍了一种混凝土与钢板混合结构的立筒仓。针对施工过程中钢斗安装中出现的钢斗与连接法兰、连接法兰与预留孔之间的配合及安装困难等问题,论述了分段制作法兰的设计方法及钢斗安装工艺,确保了钢斗安装顺利进行。  相似文献   

2.
工业厂房中预埋件具有十分重要的作用,直接影响着设备安装工程的安装质量及安全,因此必须予以足够的重视。本文针对大尺寸薄壁型钢板预埋件的施工工艺、制作、运输、安装进行了介绍,同时具体阐述了预埋件施工的偏差现象和施工方案的改进措施。  相似文献   

3.
我厂技术人员参考兄弟厂的经验,结合我厂的实际,自行设计制作了蒸煮采样装置,解决了在蒸煮过程中不便采样的矛盾。一、采样器安装位置蒸煮采样器是普通钢板焊接而成的,安装在喷放装置的管路上.如图1所示.  相似文献   

4.
《五金科技》2007,35(2):43-43
正确识别和选购防盗安全门有3种方法。 1肉眼观看:防盗安全门门框的钢板厚度在两毫米以上,门体厚度一般在20厘米以上,门体夹层中布有数根矩形管加强筋,并灌装有发泡剂、岩棉等填充物。防盗安全门必须安装经公安部型式检验合格的防盗锁具,锁体周围还应有加强板、增加防破坏强度。钢质防护门中单层钢板门较多。  相似文献   

5.
500吨/日连续渗出器,机体采用钢板冷作成型焊接结构。机身全长20米,分成5个单体制造,中间采用立体安装。这种焊接结构,由于制造和安装误差的存在,组装后机体的几何形状是很难保证垂直、平行或保持一条直线的,这就是整机运转不利的因素之一。  相似文献   

6.
钢板仓发展现状及展望   总被引:4,自引:0,他引:4  
阐述了钢板仓的发展过程及钢板仓储粮安全,使用年限,材质和配套设计等。着重介绍利浦钢板仓的制作,安装,国内钢板仓的发展现状及应用前景。  相似文献   

7.
浸锌钢结构人行道板采用型钢和钢板通过焊接固定,结构稳定,轻便,抗震,耐锈蚀,美观,使用寿命长,安装方便。希望通过文章的分析,能够为相关工作提供参考。  相似文献   

8.
轻钢结构住宅具有独特的优点,是我国住宅工业化发展的方向。近年来轻钢结构住宅已逐步被人们接受,并形成一整套成熟技术。但现行建筑管理模式与轻钢结构住宅体系工业化生产方式不适应,要求我们在实践中不断总结。轻钢结构住宅在结构抗震性、自重、工厂化生产、建设速度、劳动强度、技术含量高和回收利用方面具有一定优势。轻钢结构住宅体系施工工艺过程、安装和校正、压型钢板安装、栓钉焊接技术、除锈与涂装等问题需在实践中不断总结,使轻钢结构住宅体系施工技术和管理更趋成熟完善。  相似文献   

9.
浅谈日本胶合板热压机从日本进口的胶合板生产设备中,热压机、装卸板机具有结构设计合理、动作可靠、故障率低等优点。下面仅就我厂引进日本生产的热压机谈几点看法。1机架部分:该机机架采用焊接式整体结构,用厚12mm的普通钢板在上下横梁处呈蜂窝状焊接。安装油缸...  相似文献   

10.
本文报告了立式圆柱形钢板油罐的一种制作技术。介绍了油罐充气顶升安装制作的理论依据和具体步骤以及主要的辅助设备和装置。此制作办法操作较简便,制作周期短,并且可降低油罐的制作成本,改善工人劳动强度,提高生产效率,具有实际的使用价值。  相似文献   

11.
Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.  相似文献   

12.
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.  相似文献   

13.
The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.  相似文献   

14.
The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.  相似文献   

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17.
This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.  相似文献   

18.
<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the  相似文献   

19.
《印刷工业》2014,(11):95-95
According to Printing and Printing Equipment Industries Association of China(PEIAC)'s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.  相似文献   

20.
《印刷工业》2014,(8):103-103
正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press  相似文献   

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