共查询到20条相似文献,搜索用时 437 毫秒
1.
Qizhong Guo Chi-Yuan Fan Ramjee Raghaven Richard Field 《Canadian Metallurgical Quarterly》2004,130(5):463-466
The objective of this study was to test the performance of a traditional gate-flushing device and a newly designed vacuum-flushing device in removing sediment from combined sewers and CSO storage tanks. A laboratory hydraulic flume was used to simulate a reach of sewer or storage tank. The flushing device was fabricated and installed at upstream end of the flume. The removed sediment was collected at downstream end of the flume and weighed. The test results indicate that the weight of flushed sediment increases with increasing initial water depth in the flushing device; the weight of flushed sediment decreases with increasing initial water depth in the flume; the weight of flushed sediment only changes slightly with changing height of flushing device opening for water release and does not necessarily increase with increasing opening height. Water is held up by vacuum and is released upon dissipation of the vacuum in the vacuum-flushing device rather than through closing and opening of a mechanical gate in the gate-flushing device. The test results indicate that sediment removal efficiency of the vacuum-flushing device is practically the same as the gate-flushing device. 相似文献
2.
通过对某钢厂电力系统特点以及连续性生产要求的分析,结合备自投装置存在的问题及应注意的事项,分析了该钢厂系统采用快速切换装置的必要性。通过电源快速切换装置在该钢厂系统中的应用和试验,验证了快速切换装置的可行性及优越性,提出了快速切换装置在工业企业中的推广应用。 相似文献
3.
铝电解多功能工具小车及其中的各项工具是电解铝生产中所必需的核心部分,针对其结构的改进、优化是非常重要的,简单介绍了工具小车及其各项工具的主要功能及结构特点,重点阐述了工具小车各部分结构的改进、优化,包括工具小车运行装置轨道刷及支架、工具小车回转装置的驱动装置、下料装置检修平台、下料装置仓体、下料装置旋转装置、更换阳极装... 相似文献
4.
5.
以自主开发的四点悬挂式转炉连接装置为研究对象,运用有限元软件,结合子模型分析技术,对主、副悬挂装置进行受力分析,并结合材料的屈服极限,对主、副悬挂装置危险部件进行强度校核。计算结果表明:主悬挂局部最大综合应力大于副悬挂局部最大综合应力,达到了四点悬挂装置的初始设计要求,各危险部件受载均在安全范围之内。 相似文献
6.
选用VB3000数据采集器、传感器及Ascent数据库软件建立空压机离线监测系统,根据螺杆空压机的结构特点,利用状态监测与故障诊断技术,设置空压机的检测点,设定测量位置及测量项目,利用数据采集器及测振仪等,定期对螺杆空压机轴承座振动数据进行采集、分析和诊断,发现设备运行中的早期故障,为设备维修提供可靠的信息,延长设备的使用寿命,减少设备维修费用,从而保障设备的安全运行。 相似文献
7.
阐述了转炉活动烟罩柔性升降装置的重要性,并对柔性升降装置的结构、测试装置以及工程应用进行了论述,提出了柔性升降装置大型化的解决思路。 相似文献
8.
介绍了贵溪冶炼厂极板转运设备阳极板载运车提升卸载装置的组成及工作原理,并从提升卸载装置缺乏自由度、限位支架损坏摆动撞击、提升装置倾斜重力、硬性碰撞冲击四个方面分析了提升卸载装置产生变形的原因,最终确定是由于提升装置倾斜重力、硬性碰撞冲击导致提升卸载装置产生变形。通过分析,采用加强立板的方式进行改进优化,经计算验证,改进方式是可行的,可以解决阳极板载运车提升卸载装置变形的问题。 相似文献
9.
10.
P Loisel S Poitras J Lemaire P Durand A Southière L Abenhaim 《Canadian Metallurgical Quarterly》1998,23(14):1588-94; discussion 1595
STUDY DESIGN: A prospective cohort study of patients with subacute occupational back pain. OBJECTIVES: To study the relation between a marketed opto-electric device measuring trunk kinematics, a widely used specific functional capacity questionnaire, and work status in back pain patients, and to assess the responsiveness to change in work status of the opto-electric device and the questionnaire. SUMMARY OF BACKGROUND DATA: Several instruments have been developed to evaluate the functional capacities of patients with back pain, but the relation between these instruments and work status has rarely been studied. METHODS: The relation between the opto-electric device, the questionnaire, and work status in patients with back pain was evaluated. The study population was a prospective cohort of patients with subacute back pain who were absent from regular work for more than 4 weeks. All data were compiled blindly on the same day, at study entry (4 weeks after work accident), and at 12, 24, and 52 weeks after the work accident. The validity of the questionnaire and opto-electric device scores was assessed with partial correlation analyses, standardized response mean, logistic regression analyses, and receiver operating characteristics curves. RESULTS: The correlation between the questionnaire and opto-electric device scores was low. The questionnaire scores were significantly related to work status, but the opto-electric device scores were not. The questionnaire was responsive to change in work status, whereas the opto-electric device was not. CONCLUSIONS: The opto-electric device scores were not related to either functional capacity scores (questionnaire) or work status in patients with low back pain, and the opto-electric device was not responsive to change in work status. Conversely, the questionnaire was related to work status and was responsive to change in work status. 相似文献
11.
设计了一种新型的轧辊轴承座辅助装配装置,该装置是一种对轧辊轴承座与轧辊进行安装和拆卸的辅助工装,结构简单,易于操作。另外还介绍了对装置的核心部件进行设计计算及强度校核的方法,并对该装置进行了Inventor三维建模,从而更加形象、直观地展示其工作原理。 相似文献
12.
13.
烧结混合料的透气性是烧结过程中重要的工艺参数,随混合料的水含量、原料配比和制粒等因素的变化而不断变化。为了能够在烧结机现场获取透气性的情况,有必要研发一套透气性在线测定装置。模拟烧结现场的工艺条件,在实验室条件下开发并组装了一套透气性测定装置,进行了一系列混合料透气性指数的测定试验,结果表明:本装置的测定结果具有较好的重现性和稳定性;该测定装置能准确反映出混合料水含量、烧结原料配比和制粒条件变化时透气性的变化情况。因此,本测定装置完全可以实现在烧结厂对混合料透气性的在线测定,并为指导烧结生产提供参考依据。 相似文献
14.
目前,在国内多数地区采用小电流接地选线装置。这种装置适用于3~66 kV中性点不接地或中性点经电阻、消弧线圈接地装置的单相接地选线。小电流接地选线装置,能够快速、准确的判断出单相接地故障。并且其接地电流小,如若出现事故,能够防止事故扩大的趋势。但小电流接地选线装置选线的准确率偏低,系统运行方式多变,容易引起因接地电流小而带来的误判。 相似文献
15.
16.
介绍了百米高速重轨CCS万能轧机中钢轨横移及定尺切断装置设计的问题,然后对百米重轨CCS万能轧机后钢轨横移及定尺切断装置的设备组成、功能及布置进行了全面说明,并重点介绍钢轨及型钢分段工艺流程;最后阐述了百米重轨CCS万能轧机后钢轨横移及定尺切断装置对百米重轨及型钢生产具有重要意义。 相似文献
17.
介绍了2500 mm四辊轧机改造升级为2690 mm四辊轧机的方法,重点论述了万向联轴器、联轴器平衡装置、工作辊装配、平衡系统装置、压下装置及推床的改造内容。 相似文献
18.
针对热轧带钢生产工艺中轧机出口与带钢成品卷存储仓库标高不一致、轧机出口空间位置有限的情况,阐述了一种新型钢卷升降装置。该装置具有设备构成简单、占用空间较小以及便于在线检修的特性。在设备设计时,依据轧线的连续生产工艺特性,力求该设备结构简单,稳定运行时间长。设备投用后,在一个年休区间内一直稳定运行,圆满保证了生产线的稳定生产;同时,该设备具有良好的应用前景。 相似文献
19.
20.
介绍了一种全数字同步电动机励磁装置,该装置以PLC及微机控制器为控制核心,以触摸屏为操作界面,具有完善的励磁控制、系统保护、故障报警及显示功能。对该装置的投励、脉冲形成、灭磁、故障保护、通讯等关键技术作了较为详细的阐述。 相似文献