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目的为了提高食品、医疗等行业包装产品的生产效率、自动化程度以及降低企业成本,对能够实现短小丝条状物料连续包装、自动计量和充填来代替人工操作的特殊机械手开展研究。方法应用机电一体化和控制技术,设计一种全自动机械手,机械手整体采用直角坐标型设计方案;机械手由6只料手构成,并配置单片机称量装置,实现自动计量;料手采用多指结构,通过控制料手动作,实现抓取物料和卸放充填包装;机械手水平往复运动和竖直上下运动由PLC控制实现;结果对机械手样机进行试验研究,结果表明该机械手能够模仿人工操作,可以实现对短小丝条状物料的拾取、计量和充填。结论该机械手的设计原理可行,为短小丝条状物料的全自动化包装奠定了技术基础。 相似文献
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为了提高橡胶连续混炼中混炼胶质量稳定性,实现炭黑等粉体物料精确配比和均匀性混合问题,针对粉体物料在混合和输送过程存在复杂的物理性质,建立了炭黑等混合粉料的球体颗粒模型和Hertz接触力-位移模型,采用EDEM对典型粉体物料混合均匀性进行模拟仿真和粉体物料混合实验,对炭黑等粉体物料在橡胶连续混炼工艺中的混合均匀性进行分析,探求橡胶粉料连续混合和输送机理.研究发现:粉体物料混合仿真与实验测试结果具有较高的拟合性,表明在橡胶连续混炼工艺中可以在保证混合均匀性的前提下实现多粉体混合物的连续称量和输送,同时也验证了运用EDEM数据模拟仿真粉体物料混合的可行性. 相似文献
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对于盐业生产企业来说,原盐的计量包装一直是困扰行业发展的难题之一。在计量包装秤中,物料的给料控制是实现最终计量包装的关键步骤之一。要准确迅速地对原盐进行计量,就要求给料装置能提供均匀连续的盐料并能对供料进行精确地控制,以适应计量包装的基本要求。目前,国内针对计量包装秤对不同特性物料进行包装时常采用的有四种供料方式:即螺旋输送器(绞笼)供料、皮带机供料、气动门自流式供料和电磁震动式供料。螺旋输送器在输送过程中可对物料进行搅拌,并在一定程度上把较大颗料的盐料搅碎以减小盐料进入计量装置时的落料冲击,提高供料时的稳定性;同时,螺旋输送器可以通过对电动机的选用和控制而实现对计量装置供料时的准确控制。 相似文献
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对我国散料连续输送技术迈向21世纪的展望 总被引:1,自引:0,他引:1
散料连续输送技术和装备是物流技术与装备中重要的组成部分之一。本文论述了散料连续输送技术的发展随经济结构、市场环境变化之间的关系,并对我国散料连续输送技术迈向21 世纪进行了展望 相似文献
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目前在粉状、颗粒状、块状物料的输送中,传统的输送方式大都采用的是电磁振动器、惯性振动器、以及基于匀速运转的电机驱动的其它机械输送,采用这类输送方式输送物料时料槽会产生振动,从而会使物料分层,并把粘在物料上的细微颗粒(如调料品等)震得脱离本体.为了便于清洁,符合相关卫生标准,一般不采用皮带机输送. 相似文献
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在烟草行业制丝生产线上连续运送烟草物料的设备有带式输送机、振动输送机、气力输送机。这三种输送设备都是起到输送物料的作用,是各主机间的辅助联接设备。带式输送机打滑时,上游输送设备依然连续将物料输送过来,物料堆积造成堵料。通过检测皮带输送机从动辊转动,来判断皮带输送机是否打滑,及时报警停机,避免打滑引起堵料,把打滑引起故障控制在最小范围,减少打滑故障处理时间,提高制丝生产线有效作业率 相似文献
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本文通过开展缝合式三维编织C/SiC复合材料的准静态单轴拉伸及循环加卸载试验,研究加卸载行为对复合材料的损伤及材料内部能量耗散的影响。通过对材料的断口分析,探究加卸载对材料破坏强度的影响规律。结果表明,加卸载行为会消耗材料内部的能量,对纤维束与基体之间的界面造成损伤,进而降低材料的承载能力;材料滞回曲线的面积随着卸载点应力的增大而增大;材料的整体失效属于脆性破坏,复合材料断口表现出明显的分层现象,且单轴拉伸时断口相对于循环加卸载更整齐。 相似文献
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In the present work, carbon nanotube (CNT) fibers had been embedded to glass fiber reinforced polymers (GFRP) for the structural health monitoring of the composite material. The addition of the conductive CNT fiber to the non-conductive GFRP material aims to enhance its multi-function ability; the test specimen’s response to mechanical load and the insitu CNT fiber’s electrical resistance measurements were correlated for sensing and damage monitoring purposes. It is the first time this fiber is used in composite materials for sensing purposes; CNT fiber is easy to be embedded and does not downgrade the material’s mechanical properties. Various incremental loading–unloading steps had been applied to the manufactured specimens in tension as well as in three-point bending tests. The CNT fiber worked as a sensor in both, tensile and compression loadings. A direct correlation between the mechanical loading and the electrical resistance change had been established for the investigated specimens. For high stress (or strain) level loadings, residual resistance measurements of the CNT fiber were observed after unloading. Accumulating damage to the composite material had been calculated and was correlated to the electrical resistance readings. The established correlation between these parameters changed according to the material’s loading history. 相似文献
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分析了将氨液分离器设计安装于低温冷库内的氨制冷系统的缺点,提出将氨液分离器及相关阀门搬迁至库外,改变热氨冲霜回液管设计的解决方法;并提供了氨液分离器安装高度的一种计算方法。 相似文献
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《Advanced Powder Technology》2021,32(11):3954-3963
The silver nanowire (AgNWs) / cotton fiber was used as a conductive substrate with high conductivity charge transfer. Then the polyaniline (PANI) molecular chain was fixed on the AgNWs / cotton fiber by in-situ polymerization to prevent its dedoping and improve its cyclic properties. Thus the flexible capacitor electrode material with conductive, specific capacity and cyclic properties was obtained. The results showed that when the mass ratio of KH-560 to AgNWs/cotton fiber was 3:1, the grafting rate of epoxide group on the modified AgNWs/cotton fiber was the highest. When the mass ratio of aniline to modified AgNWs cotton fabric was 3:1, the PANI content of in-situ polymerization on the fabric surface was the highest, 20.83%. The specific capacity of PANI/AgNWs/cotton fiber electrode material was the highest, 154 F/g, after 5000 cycles of charging and discharging, the specific capacity could keep 96%. It is worth mentioning, the introduction of PANI and AgNWs could significantly improve the wear resistance of cotton fiber, the friction resistance of the cotton fabric increased to 36,000 times. It is provided a new idea for design a flexible capacitor electrode material integrating electrical conductivity and cyclic stability. 相似文献
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目的 研究带有初始曲率的整体壁板在压展过程中的变形回弹规律,以确定压展模具的型面曲率半径。方法 针对壁板压展回弹过程,用初始、加载和卸载3个典型状态来描述材料在截面圆周方向上的变形情况,推导应变和应力分布规律以及卸载后的力学平衡条件,从而得到壁板初始曲率半径、加载曲率半径以及卸载回弹后曲率半径之间的关系。再利用有限元仿真和试验,对理论推导的结果进行验证。结果 通过数值计算,对比了理论计算中采用不同材料模型所得到的结果,表明材料模型的准确性对计算结果有较大的影响。得到了给定回弹后曲率半径情况下初始曲率半径与加载曲率半径之间的数值关系,以及给定初始曲率半径情况下加载曲率半径与回弹后曲率半径之间的数值关系,有限元仿真和试验结果验证了后者的准确性。结论通过对整体壁板压展过程进行理论推导,得到的结果能够较准确地描述曲率半径的变化规律,可作为压展模具型面设计的依据。 相似文献
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Unidirectional loop layouts (ULLs) are the preferred layouts in manufacturing systems owing to their relative low investment costs, high material handling elasticity and routing flexibility. Existing formulations of the unidirectional loop layout problem are concentrated on the arrangement of workstations under the assumption that the number and location of loading and unloading stations are known. In this study, the unidirectional loop layout problem is generalised by consideration of potentially attachable loading/unloading equipment to each workstation and releasing of the predetermined number of loading and unloading stations. Thus, more efficient and effective loop layout designs are allowed by eliminating some artificial restrictions. The present ULL model is generalised and a genetic algorithm is developed to solve the problem. Solutions obtained by the genetic algorithm outperformed those obtained by conventional methods. Additionally, comparisons of the generalised model with existing models on randomly generated test problems yielded encouraging results. 相似文献
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目的 针对丝瓜络这种天然植物纤维材料的松弛特性进行详尽的力学特性的研究,探究其应用于沙发坐垫弹性填充材料的潜力,以及实际应用的坍塌情况和支撑性能。方法 结合实际使用情景模拟人短暂间隔使用沙发和使用多年之后的情境,进行应变松弛与耐久性实验设计。结果 高密度丝瓜络压缩之后有一定弹性,有应用于坐垫弹性材料的可能。高密度丝瓜络回弹性能好,经过6 h基本可回弹至原高度水平;高密度的丝瓜络整体抗蠕变性能较好,压缩了20%的高密度丝瓜络蠕变程度最小。高密度丝瓜络在模拟长期反复加载卸载耐久性实验后,没有发生整体塌陷或形变。结论 进一步证明了丝瓜络具有成为沙发坐垫中海绵的生物质泡沫材料替代品的潜力。 相似文献
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研究了室温下针刺C/SiC复合材料的静拉伸应力-应变行为。基于显微CT技术重构的微观型貌,选取恰当的代表体积单元,建立了针刺C/SiC复合材料应力-应变性能预测的单胞模型。基于可实现任意加卸载下单向纤维增强C/SiC复合材料应力-应变计算的界面摩擦模型,由材料的细观组分性能计算出单向纤维束层的应力-应变响应,然后将单向纤维束层的应力-应变响应代入到单胞模型中,通过有限元法计算得到针刺C/SiC复合材料的整体应力-应变响应。进行了针刺C/SiC复合材料静拉伸试验,测得材料的应力-应变响应,计算结果与试验吻合较好。 相似文献