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采掘设备液压综合试验检测系统由小液压泵试验、大液压泵试验、液压马达试验、采煤机牵引部试验、液压阀试验、液压缸试验及电气控制、信号采集与数据处理等部分组成。液压泵试验、液压马达试验和采煤机牵引部 (泵箱 )试验共用一套液压加载系统 ,利用电磁比例溢流阀进行加载 ,采煤机牵引部试验用双马达对拉加载 ,为保证马达转速同步 ,设有同步装置 ;为保证液压站高压泵的流量与被试马达的流量相匹配 ,通过比例控制器对比例泵的变量机构进行调节。液压阀试验和液压缸试验共用一个试验台试验。全部试验数据由传感器检测 ,由工业控制计算机进行… 相似文献
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为了检测采煤机整机的性能并对其工作时的状况进行全面的测试,现构想一种固定式整机加载试验装置,来模拟实际工况时截割部及牵引部同时工作的情景,对采煤机各部同步进行加载、检测,能克服部件分别加载的缺点,通过科学的方法,收集信息,及时反馈、改进,以便有效地提升产品质量。 相似文献
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采煤机是煤矿生产的重要设备 ,而采煤机牵引部又是采煤机的主要组成部分 ,因此采煤机牵引部是否完好直接影响采煤机的开机率 ,从而影响煤矿生产的高产高效。介绍一套采煤机牵引部CAT测试系统 ,此系统能够对采煤机牵引部进行模拟实际工况的测试 ,测试数据和实验报表由计算机自动处理。经过 4a多的现场使用证明 ,系统工作可靠 ,具有良好的应用前景。 相似文献
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《Minerals Engineering》2006,19(13):1357-1361
Little attention has been given to the study of grinding media shapes and how they affect load behaviour and power draw in grinding mills. To a large extent the focus has been on how grinding media shapes affect milling kinetics in terms of specific rate of breakage and breakage distribution parameterisation.This study investigated the effects of three media shapes (cylpebs, spherical and worn balls) on load behaviour and mill power draw at various mill speeds and load filling. An inductive proximity probe was used to determine the load orientation of the grinding media charge while a load beam enabled measurement of power draw.The variations in toe and shoulder positions among media shapes were observed. This was also reflected in the power draw. The power increases to a maximum with increasing mill speed for all media shapes. The maximum power draw was reached at different mill speeds for the three studied media shapes. 相似文献
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Simulations were carried out in Metso’s DEM simulator so as to draw up an understanding of the effects the various ways of defining media shapes within the simulator have on the load behaviour and mill power draw. Wits University made available the load behaviour and mill power draw experimental results for the spherical balls, worn balls and cylpebs so as to validate the DEM simulations. The spherical media were defined by a regular spherical shape model and a multi-faceted polyhedron model. Worn balls were defined by super quadric models. A comparison was made between spherical media shapes, non-spherical single media shapes and a distribution of non-spherical media shapes and sizes in representing a load comprised of worn balls. The effect of increasing angularity of non-spherical media shapes on mill power was investigated. The cylpebs were modelled using a regular cylindrical shape model and the effects of friction on the power drawn were determined. 相似文献
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《Minerals Engineering》2003,16(10):993-998
Grinding mills are usually lined with lifters to improve their efficiency. During the course of operation, the lifters are worn away. This will affect the energy efficiency and capacity of mills and the behavior of the load in the mill and finally leads to a relining to replace the worn lifters. However, the effects of the profiles of lifters are not taken into account in all the previous power models for rotary mills. Discrete element method (DEM) is capable of demonstrating the effects of lifter profiles on mill power and load behavior. In this paper, two types of lifter profiles, square and trapezoidal, are investigated in terms of mill power and load behavior with a 2D mill and a DEM simulator, Millsoft, over a wide range of rotational speed. DEM satisfactorily predicted the load behavior and power draw for different lifter profiles at sub-critical speeds comparing with the experimental results. It is found that the trapezoidal lifters draw more power than the square lifters. An attempt has been made to explain the difference between measured and simulated power using photographs of experimental load behavior. 相似文献
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采用自行研制的重力恒载蠕变渗流实验系统开展了砂岩恒定围压下的循环加载试验,得到不同围压下砂岩的应力应变过程。考虑岩样加载过程中的非线性变形特性,假定了轴向应力是轴向应变和球形应力函数;利用热力学基本原理,分析岩样损伤演化过程中能量耗散及转化关系;将受载岩样应力分为有效弹性部分和损伤部分,弹性部分受载损伤演化,损伤部分最终演化为残余应力;基于损伤力学基本原理,理论推导建立了三轴压缩情况下考虑残余应力的砂岩损伤本构关系,并对理论模型进行实验验证。研究结果表明所建立的损伤本构模型能很好地反映岩石受载损伤全应力应变过程,也能反映出围压对岩石损伤能量耗散的影响规律,随着围压的增大,砂岩需要损伤演化消耗的机械能也越大。 相似文献
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大功率采煤机截割部,结构复杂、承载能力突出、控制运转要求严格。应用调节技术设计采煤机的模拟试验台,结合采煤机负载图谱对系统进行多参数多输入控制,使之有效、可控、易于实现,达到良好的经济效果。 相似文献
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