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The friction performances of carbon face were investigated with an inertia friction tester. The torque curve of carbon face was ideal, the coefficient of static friction was lower than that of dynamic in 0.28 MPa, the friction coefficient of static and dynamic decreased with the braking pressure increasing. To the fiber face, the coefficient of dynamic friction of carbon face was more stable in cycle braking process, the wear rate was lower, and it was efficient to protect the couple plate not to be worn.
结果表明:碳质层的摩擦力矩在制动初期上升较快,中间过渡区平稳,尾部翘起较小;在制动压力小于0.28 MPa时静摩擦系数小于动摩擦系数,且动、静摩擦系数均随制动压力增加而减小;相对纤维层而言,采用碳质层摩擦时摩擦力矩曲线形态更好,连续制动时摩擦系数波动较小,磨损率低且能够有效保护偶件,是1种静/动摩擦系数比较低且适用于高载荷工况条件下使用的摩擦材料。
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The friction performances of carbon face were investigated with an inertia friction tester.The torque curve of carbon face was ideal,the coefficient of static friction was lower than that of dynamic in 0.28 MPa,the friction coefficient of static and dynamic decreased with the braking pressure increasing.To the fiber face,the coefficient of dynamic fric...
结果表明:碳质层的摩擦力矩在制动初期上升较快,中间过渡区平稳,尾部翘起较小;在制动压力小于0.28 MPa时静摩擦系数小于动摩擦系数,且动、静摩擦系数均随制动压力增加而减小;相对纤维层而言,采用碳质层摩擦时摩擦力矩曲线形态更好,连续制动时摩擦系数波动较小,磨损率低且能够有效保护偶件,是1种静/动摩擦系数比较低且适用于高载荷工况条件下使用的摩擦材料。
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This research presented a new guide mechanism and belt driving theory of the abrasive band polishing for inner aperture, satisfied the driving requirement of abrasive belt leading smoothly into grinding area, realized the band grinding and band polishing of inner aperture, developed a abrasive band polishing headstock for of the ball track of ball bearing and roller bearing individually adopting a way of curvature concave oscillating and vibrating, researched the process regular and fundamental process method and parameter of abrasive band polishing of ball track. The results of experiments and tests showed that the surface roughness of ball track by abrasive band polishing can reach Ra0.02μm, and the original geometric cross section shape precision of ball track can be kept.
本项研究提出了砂带研抛内孔的新型导引机构和传带原理,满足了砂带平稳导入内孔磨削区的传动要求,实现了内孔的砂带磨削和研抛;研制了采用弧面摆动和振动方式分别用于球轴承滚道和滚柱轴承滚道研抛的砂带研抛头架;研究了轴承滚道砂带研抛的工艺规律和基本工艺方法、工艺参数;实验测试结果,轴承滚道砂带研抛的表面粗糙度达Ra0.02μm,研抛过程保持了滚道的原始几何截面形状精度。
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The whole variable features and regularities of geo-stress field are summed up in Xiluodu deep-cutting gorge. The results reveal that the major and minor principal stress of measure point increase lineally with the vertical depths in the gorge area, and also indicate that the coefficient a〓, a〓, b〓, and b〓 of the linear equation are changeable with the erosion depth of rock mass.
认为该峡谷区中,谷河底部最大、最小水平应力量值总体上具有随深度增加而线性增大的特征,但其线性方程的系数a〓、a〓、b〓、b〓,随地表高程的低高或者说河谷侵蚀厚度的深浅而变化;岸坡山体中仅存在应力降低区和应力相对平稳区而没有明显的应力增高区,应力降低区与应力相对平稳区的分界线在水平埋深135~165m之间。
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The bubble diameter distribution over cross—sectional area of bed was correlated by statistical method.
发现气泡直径分布明显的可分为两个区,即中心区和平稳区。
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Clearly, producers have been prepositioning crude in key consuming regions to mitigate the potential impact of a prolonged supply disruption, thereby assuming the financial risk and burden of transforming long haul into short haul supply. These are certainly positive developments.
很显然,各大石油公司和产油国已经在各主要石油消费区预先布置了大量原油储备,以便在伊拉克等国的生产中断延长的情况下缓解其不利影响,从而有效地抗御由此造成的财务风险,平稳地实现从短途供应到远程供应的转变。
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The decreasing trend type,which is the main type in China,including the north part ofDaxinanling,the Xiaoxinanling,the Changbai Mountain,the Maxian Mountain,the westpart of Tianmu Mountains,the Mupu Mountain,the Donggong Mountain,the BaizuMountain,the Jiufeng Mountains,the Jiulong Mountain,the Fengyang Mountain,theWangyang Mountain,the Badagong Mountain,the Hefeng Mountain,the Qixing Mountain,the Fanjing Mountain,the Leigong Mountain,the Xishan in Kunming,the Jinfo Mountain,the Haba snow Mountain,the Zhenkang snow Mountain in which the plant species diversitydecreased steadily,and the Huangshan Mountain,the Hualong Mountain,the SheulongjiaMountain,the Dupangling,the Jiu Lian Mountain in which the species diversity decreasewith the difference,the latter is of a slight"the mid-altitude bulge".
趋势减少型为我国山地森林群落植物物种多样性变化的主要形式,其中再区分为大兴安岭北部山地、小兴安岭、长白山、马衔山、西天目山、幕埠山、洞宫山、百祖山、南鹫峰山、九龙山、凤阳山、万洋山、八大公山、鹤峰山、七星山、梵净山、雷公山、昆明西山、金佛山、哈巴雪山、镇康大雪山等平稳减少型;黄山、化龙山、神农架、都庞岭、九连山和武夷山地、点苍山、西双版纳低山地等波动减少型,这些山地存在轻度的"中等高度的膨胀"现象,但东北地区的山地、浙闽粤低山丘陵区的大部分山地、湘西、鄂西和川黔交界区山地的"中等高度的膨胀"现象不甚明显
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Vacuum belt hydroextractor (also named fixed rubber belt vacuum filter) is a new solid-liquid separating equipment with high efficiency and continuous operation, based on introduction, assimilation and digestion of the techniques of the same products overseas. It has achieved solid-liquid separation by making full use of material gravity and vacuum suction. In terms of its structure, filtering section is arranged horizontally lengthwise, and length of filtering section can be fully used to fulfill in turn such a process covering filtering, rinsing and sucking up, with advantages of high filtering efficiency, productivity, good rinsing effect, wide application range, simple operation, stable running, convenient maintenance and service.
真空皮带脱水机也叫固定真空室式橡胶带式过滤机;是我公司在引进、消化和吸收国外同类产品技术基础上,研制的一种新型、高效、并可连续操作的固液分离机械设备,同时它也是一种充分利用物料重力和真空吸力实现固液分离的机械设备;在结构上真空区沿水平方向布置,利用真空区的长度可以连续完成过滤、洗涤、吸干等不同工艺过程,具有过滤效果高、生产能力大、洗涤效果好、应用范围广、操作简单、运行平稳、维护保养方便等优点;特别适合于过滤固相颗粒粗、密度大及滤饼需要多次洗涤的悬浮液料浆,可以广泛应用于冶金、矿山、化工、造纸、食品、制药及环保等工业部门的固液分离;尤其在湿法烟气脱硫中的石膏脱水方面有着很好的应用。
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By regression of experimental data, therules of the linkage between these factors, which will provide a theoretical basis for designing BBP with different scales.3 Using thermal analysis technology and dynamic thermogravimetry, the paper studies combustion kinetic characteristics of 3 types of agricultural crops at different rate of temperature rise, and thus, achieved dynamic parameters of these fuels at different rate of temperature, established dynamic model of straw combustion, which reflects the dynamic process in the fast combustion area.4 Characteristics of straw briquette combustion was experimented, focusing on the impact of straw type, temperature, air supply, and density, diameter, and weight of briquette on the combustion speed, and the following conclusions were drawn:(1) combustion of straw briquette fuel is static permeation diffusion combustion;(2) temperature has a larger impact on the speed of straw briquette combustion than air supply; the higher the combustion temperature is, the faster volatilizable component separates out, and the less steady the combustion is;(3) density of briquette fuel has impact on the speed of volatilizable component separation and therefore the combustion speed;(4) increase of diameter and weight of briquette fuel increases the average combustion speed in the initial stage, and that in the later stages is comparatively steady;(5) the proportion of volatilizable component in straw briquette fuel is high, therefore, the temperature control during combustion under the rational ventilation condition is essential to ensure its safe combustion.5 Using the above-mentioned results of experiments and theoretical analysis, and based on thought of hydraulic driven and bi-direction compression, the hydraulic system and compression parts of the HBP BBP are re-designed in terms of industrialization.
利用热分析技术,采用动态热重实验法,对我国的三大农作物秸秆在不同升温速率下的燃烧动力学特性进行了较系统的研究。得到了各原料在不同升温速率下的动力学参数;建立了秸秆燃烧的动力学模型,该模型反映了秸秆迅速燃烧区的动力学过程。 4 对秸秆成型燃料的燃烧特性进行了试验研究。着重研究了秸秆河南农业大学博士学位论文巫的种类、温度、空气供给量、成型燃料密度、直径、质量对成型燃料燃烧速度的影响并得出如下主要结论:①秸秆成型燃料的燃烧方式属于静态渗透式扩散燃烧。②秸秆成型燃料燃烧速度受温度的影响大于通风量燃烧速度的影响:燃烧温度越高,挥发分析出速度越快,燃烧平稳性愈差。③成型燃料密度影响成型燃料挥发分的析出速度,影响燃烧速度。④成型燃料直径和质量的增加,使得燃烧初期的平均燃烧速度增大,中后期的平均燃烧速度相对平稳。⑤秸秆成型燃料含挥发分比例高,因此合理配风下的控温燃烧是保证其完全燃烧的关键。 5运用已取得的试验和理论分析结果,以液压驱动、双向成型为基础,从产业化的角度对HBP型成型机进行了液压系统和成型部件的改进设计;同时采用了二级预压机构,使该成型机的生产率达到 500kg.hd;单位能耗 60kwh。上'左右,磨损件修复周期 300小时左右,基本解决了影响生物质固化技术在国内推广的技术难题。
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The ring is rolled by drive roller and mandrel roller, drive roller offer rotation to make ring rotate continuously and mandrel roller offer line feed to make the ring wall become thinner and thinner. The guide roller ensure the ring rolled comfort, and inspect roller check the rings diameter whether reach the limit dimension.
主动辊提供转动,使环件变形区不断循环周而复始的通过轧辊孔型;芯辊提供直线进给运动,使环件壁厚不断减小以实现环件直径扩大的加工过程;导向辊保证轧制平稳进行,检测辊测量轧制环件尺寸是否达到要求以停止轧制。