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1.
针对永磁传动设备在输送或搅拌系统内存在颗粒、悬浮物等工况下,采用内压差介质循环冷却、润滑系统不能符合工况使用要求以及外接冷却、润滑系统造成冷却、润滑系统介质与输送或搅拌系统介质之间对流、甚至污染等问题,提出了一种磁闭锁装置。  相似文献   

2.
低速大扭矩潜油永磁同步电机直接驱动螺杆泵采油作为一项新技术逐渐被油田应用。为了评价该套系统的性能及可靠性,为实际应用提供依据,同时应用于教学,设计了一套潜油永磁同步电机直驱螺杆泵采油实验平台,主要包括潜油永磁同步电机直驱螺杆泵机组、油管路循环系统、控制系统和参数采集系统。完成了实验平台的设计、加工、安装及测试。该实验平台可有效开展不同工况下潜油永磁同步电机性能测试及采油系统性能测试,重点验证潜油永磁同步电机设计的有效性;采用该实验平台开展电机直驱螺杆泵采油实验教学,使学生深入了解新型采油设备及过程,理论与实验教学有机结合,对培养学生科学实验及创新能力起到了积极作用。  相似文献   

3.
百分表为一种指示式量仪,在中级车工应知理论内,众所周知其可以检查工件的形状和位置精度,检查偏心轴偏心距,进行多头螺纹的分头,做成专用测量工具和检查车床精度等。在使用中有读数值小至0.01mm,甚至0.001mm和使用起来较方便的特点,因此在车削加工中应用甚广。现列举三个实例。 一、车偏心轴,正确校整其偏心距 在无划线的条件下车削偏心轴,可以用百分表校整偏心距来确保其偏心距精度。用四爪带垫片装夹工件,当偏心距小于2.5mm时使用两个量程在5mm的钟表式百分表,校整  相似文献   

4.
在车床用三爪卡盘或四爪卡盘加工偏心轴时,通常要在工件上找出偏心轴线,装夹时通过打表测量使偏心轴线与车床主轴重合。这种方法装夹麻烦,效率低,不适合偏心轴的大批量生产。因此,设计了一种专用夹具,使每次加工偏心轴不需要划线和打表校正,缩短了辅助时间,提高了劳动生产率。  相似文献   

5.
正一、引言广东省粤东高级技工学校了解到某自来水厂在排泥过程中水电浪费严重的问题后,成立了由专业教师任组长,骨干学生参加的课题组,科学合理的解决了问题。学生得到了实践的锻炼,教师积累了教学经验,企业提高了效益,三方受益。经课题组调查发现,某自来水厂建立于90年代初期,该厂的沉淀池从建立至今一直使用虹吸式吸泥机排泥。虹吸式吸泥机具有以下特点:1、采用自动往返工作,虹吸排泥且排泥可靠;2、运行平稳,对沉淀池污泥干  相似文献   

6.
在单件小批生产中,车削小偏心轴(e≤D/3)时,如果把车床上的三爪卡盘更换成四爪卡盘,当然可以加工出偏心轴。但是需要一些辅助工具,而且更换、调整工作需要花很长时间。生产中常在三爪卡盘的一个爪上加一个垫块来加工小偏心轴。但需要知道垫块厚度,  相似文献   

7.
偏心桨叶轮是一种新型轮式机构,采用偏心桨叶轮设计的新型水陆两栖机器人具有高效稳定的行走步态。以偏心桨机构为研究对象,搭建了基于LabVIEW系统的陆上步态测试实验台。通过300余组实验,完成了偏心桨机构陆上步态实验,并对实验结果进行了比对分析。结果表明:偏心桨叶轮较传统的光轮具有良好的越障能力;随着障碍物高度的增加,轮子翻越障碍物的成功率下降,在T1、T2、T3三种障碍物情况下,平均成功率分别为83.33%、70.00%、46.67%;桨叶轴位置对越障能力以及偏心桨机构运动性能具有显著影响。因此,通过合理的规划桨叶轴的轨迹有望显著提高偏心桨叶轮式机器人在复杂环境下的通过性。  相似文献   

8.
目前随着环境科学的发展,对过去污泥处理方法:填埋法、排海、堆肥、焚烧等方法有了进一步的认识.污泥处理要做到减量化、资源化、无害化,污泥焚烧技术已成为污泥处理的主流技术.本文对污泥焚烧技术进行分析,有利于焚烧技术改善和提高.  相似文献   

9.
板式家具由于其零部件的通用性和互换性,符合大批量生产条件。由于其对零部件加工精度要求高,故对设备的要求相应就较高,因此根据产品的定位和产能的要求对板式家具设备进行选型并配置合适的设备是非常重要的。以生产覆贴木皮类板式家具的主要工序为主线,讨论了加工板式家具部件所需的电子开料锯、木皮设备、封边机及多排多轴钻床的特点,供相关家具企业在设备选型时参考。  相似文献   

10.
用于岩石三轴试验的MTS实验系统实现了在短距离搬迁中的大部件整体迁移的方案,实践表明这种搬迁方法在周密计划及现有技术的支持下,可以做到安全可靠,搬迁后的恢复性安装可使设备完全恢复到原有的性能指标。利用自制的磁电往复式换向清洗阀可彻底清洗因MTS大修及新设备安装时残留在作动器及油路里的有害物质,通过完善的保养,合理的使用可延长设备使用寿命,更好地为科研服务。  相似文献   

11.
The pressure increasing process within a twin screw multiphase pump, under the condition of high gas volume fractions (GVFs), induces large temperature and pressure changes that cause the rotors to deform. Rotor deformations heavily influence the backflow of the multiphase fluid through clearances within the twin screw multiphase pump and these deformations may even lead to pump failures. An accurate temperature and pressure distribution on the screw rotors need be obtained before the deformation analysis can be carried out. By means of small temperature and pressure sensors embedded into the groove at the root of the rotors, the temperatures of 12 points on the rotors and the pressure distributions of a twin screw multiphase pump under high GVFs conditions were recorded. Temperature test results were adopted to perform a heat transfer analysis for determining the temperature distribution on the screw rotors. Then deformation analyses, including thermal deformation, force deformation, and total deformation, were conducted according to the pressure and temperature distributions. Deformation analysis for different materials was also conducted under the same boundary conditions. A material was suggested for the manufacturing of rotors in a twin screw multiphase pump under the condition of high gas volume fractions.  相似文献   

12.
在建筑等工程领域中,需要张拉千斤顶给受拉构件中的钢筋施加预拉应力来提高构件的刚度和强度。张拉千斤顶的动力由高压电动油泵提供。从能量转换效率、工艺性可靠性等方面对四种高压电动油泵结构方案进行比较,确认叶片摆动油缸驱动双偏心轮式径向变量柱塞泵方案综合性能较优,能满足千斤顶在施工过程中的低压大流量和高压小流量工况变化要求,适合作为预应力施工机具高压电动油泵的设计方案。  相似文献   

13.
介绍了煤泥用于循环流化床锅炉燃烧发电的工艺方案,重点分析了干燥工艺和湿法输送工艺中最适合煤泥大规模利用的两种典型方案:滚筒烘干和柱塞泵输送;结合淮南矿区多个煤泥发电项目的方案论证及应用实践,提出了方案比选过程中需要考虑的主要因素。  相似文献   

14.
Due to large-scale dredging operations, a large amount of sludge is inevitably produced. Large areas of land are occupied when the dredged sludge is discarded in the disposal site as waste material. The sludge dewatering with aeration-vacuum (SDAV) method is suit for treating the sludge with high water content and high clay content in the disposal site. The water in the sludge can be discharged out. The volume of the sludge can be reduced quickly, and the recycling of the land can be accelerated by this method. Most importantly, this technique is an efficient way to deal with clogging problems when pumping water from high water content, high clay content dredged sludge. Vacuum degree range tests, the aeration rate range tests, and the influencing factors of sludge dewatering behavior tests were conducted with a self-developed SDAV model test device. Sludge samples were taken from the South-to-North Water Diversion East Line Project in Huai’an White-Horse Lake disposal site, Jiangsu Province, China. The optimal range of vacuum degree and aeration rate were obtained through the test results, and the mechanisms for how the two factors work and how they affect the sludge dewatering behavior were analyzed. The suitable vacuum degree range in SDAV is below 50 kPa, and the suitable aeration rate is about 1.0 m3/h. The low-vacuum degree contributes to reduce the ad-sorption effect of micro-channels on soil particles in filter material and to maintain the arch structures. Aeration has the effects of expansion, disturbance, changing Reynolds number, and dynamic sieve separating. The pump quantity of water per meter of filter tube (m) has different change rules as the vacuum degree changes under different aeration rates. The reason is that the formed arch structures’ conformation and permeability differ greatly under different combined-conditions of vacuum degree and aeration rate. The optimal combined-condition for dewatering the sludge is 35 kPa with 1.0 m3/h.  相似文献   

15.
Sewage source heat pump unit operates under partial load most of the time, and study on the law of coefficient of performance (COP) of the unit varying with load ratio can provide basis for the heat pump units running in high efficiency. A mathematical model determining COP, evaporation temperature and condensation temperature of a single unit was proposed. Under the condition of uniform load distribution, the model was established according to different ways of bearing partial load with the same type multiple units but different parallel operation models, and the operation characteristics of units were analyzed as well. Results show that the single screw water-source heat pump can maintain high COP only at 60%—100% load ratio, COP decreases sharply with the decrease of load ratio, and the units with parallel operation are controlled by the load ratio of a single unit according to the reduction of total load which can keep the average COP at high level within a wide load range.  相似文献   

16.
寿命周期成本是指产品一次性购置费用与整个产品使用期限内支付的各项费用的总和.在工业产品的选购过程中不仅要考虑产品自身的价格,更应强调在可靠实现用户所需功能的前提下努力寻求最低的寿命周期成本.以采油用井下单螺杆泵为例,在研究并总结了井下采油用螺杆泵结构和运行特点的基础上采用寿命周期成本(LCC)分析法对螺杆泵的寿命周期成本的控制策略进行分析,结合工程实例利用费用-效能分析法对寿命周期成本进行评价.为降低螺杆泵的寿命周期成本以及设备选型提供了理论依据.  相似文献   

17.
通过应用圆偏心夹紧机构夹紧力计算公式,提出按圆偏心自锁程度不同的分类方式及其相应的夹紧力计算方法,突出了圆偏心轮在该夹紧机构中的重要性;进一步讨论圆偏心轮的偏心距的确定,并提出了其设计程序,为正确设计和应用该机构提供了可靠的理论依据.  相似文献   

18.
在实际生产中,瓦座孔偏心现象非常少见,而且不易被发现。一般解决的方法是使用偏心轴瓦,或者重新加工瓦座孔,将孔修正。本文重点介绍了在短时间内发现偏心瓦座孔问题,以及通过提升轴瓦,将其与瓦座孔之间形成的空隙近似展开为三角形,再用叠合的垫片模拟此三角形来填充空隙,形成一个模拟的偏心轴瓦来解决瓦座孔偏心问题。  相似文献   

19.
中海达ZTS-121系列全站仪具有偏心测量的功能,为使专业技术人员能够正确使用这一特殊功能,文章较详细的阐述了全站仪偏心测量的具体施测方法,并指出了各种偏心测量的误差来源及其适用情况。  相似文献   

20.
目前常规的活性污泥处理的方法都存在投资大、处理成本高等各种问题,本文介绍了剩余污泥可溶化回流氧化处理技术及其尚待改进的问题,并重点列举了臭氧、超声波法处理剩余污泥工艺的应用实例和研究现状.为达到污泥零排放的目的并能从本质上减少污泥排放量提出了未来的发展方向和研究方向.  相似文献   

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