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螺旋输送机适宜于输送各种粉状及小粒状物料,是建材、冶金和化工等工矿企业常用的输送设备。螺旋输送机在输送物料时,有时会出现螺旋输送机断节故障,岗位工人发现不及时就会发生溢流,时间长了就会堵料,造成螺旋输送机轴扭断,同时还会烧毁电动机。 相似文献
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针对大倾角螺旋输送机输送量估算不准确的问题,修正散体物料群角速度与输送角、螺旋轴角速度之间的函数关系,并通过研究不同转速和填充率下散体物料群自由表面曲线的表达式,推导出不同自由表面曲线下的散体物料群体积和输送量的计算公式。接着,通过具体的大倾角螺旋输送机模型验证文中提出的计算公式更符合实际值。其次,通过对物料在大倾角螺旋输送机中的受力和运动分析,给出散体物料向上输送的临界条件。找出螺旋输送机输送角与螺旋叶片升角之间的关系来避免"自锁"现象。最后考虑不同螺旋轴转速、填充率,运用离散元法仿真螺旋输送机的输送过程,得到大倾角螺旋输送机输送量和功率的变化趋势,为螺旋输送机的设计提出了合理的建议。 相似文献
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将悬臂螺旋输送机中一个节距内的物料以通过轴中心线的垂直平面分为左右两部分,通过分析筒形悬臂螺旋输送机螺旋轴受力状态和物料左右重心的轨迹变化,提出了用动态双重心法来求解螺旋轴的挠度值,并通过实例计算结果与ANSYS分析值对比验证了动态双重心法分析螺旋输送机螺旋轴变形的正确性.研究结果表明,影响螺旋体挠度的主要因素是螺旋轴的重力和被输送物料对叶片产生的圆周力;螺旋输送机内物料填充率从0~1变化时,螺旋轴在物料作用下挠度的变化趋势为:低-高-低,填充率在0.73处时挠度达到最大值;悬臂螺旋输送机向上输送物料时,其螺旋轴挠度随输送倾角的增大而增大,而向下输送时,其螺旋轴挠度随输送倾角的增大而减小;随着螺旋升角的减小,螺旋输送机内物料填充率的变化对螺旋轴挠度的影响程度降低. 相似文献
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冲板流量计是针对连续输送的散状物料进行计量的设备,可以安装在多种输送机的落料点下,包括螺旋给料机、振动给料机、皮带输送机、刮板给料机或星形给料机上,所检测的典型物料包括:化肥、水泥、煤粉、矿石、砂子、塑料颗粒、谷物及糖果等物料。 相似文献
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《中国设备工程》2021,(3)
皮带输送机是一种输送过程中物料与输送皮带没有相对运动的输送设备,广泛用于各行各业。对于制丝生产线的主要设备(简称"主机"),都需要物料均匀稳定地输入,有助于产品工艺质量的稳定,物料进入主机主要是通过振动输送机,振动输送机是利用激振器使料槽振动,从而使槽内物料沿一定方向滑行或抛移的连续输送机械,具有良好的匀料功能;然而,当进入振动输送机的物料是通过皮带输送机送入时,进入的物料较集中于振动输送机横截面中部,不利于振动输送机在较短时间能实现横截面上的平铺均匀,很多工厂采用在振动输送机上设置导流板,取得了一定的匀料效果。而本文则是对皮带输送机出料口进行技术改造,增加分料装置,将物料由一路分成三路,均匀分布到下游振动输送机上,为振动输送机能在短时间内达到匀料的目的提供更好的条件。 相似文献
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Clarence W.DE SILVA 《Instrumentation》2019,(4):72-84
An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t... 相似文献
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30 keV Ga+ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z2, and shows a non-monotonic relationship between contrast and Z2. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z2, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory. 相似文献
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This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an... 相似文献
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分布动态载荷识别的抗噪处理 总被引:2,自引:2,他引:0
针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性. 相似文献
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针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。 相似文献
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J. A. Williams 《Lubrication Science》1997,3(3):267-306
Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface. 相似文献
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M. Stedman 《Journal of microscopy》1988,152(3):611-618
Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space. 相似文献
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Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking
This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern... 相似文献
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以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可. 相似文献