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针对传统四立柱四面刨送料机构驱动系统电机多的问题,设计新型送料机构,介绍设计方案,通过对送料时进给功率和送料速度等计算确定其基本设计参数,最后进行结构设计并对工作原理和运动过程进行分析。 相似文献
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本文在分析包装机直线送料的性能要求之后,提出了满足其送料特性的新机构——摆动导杆机构与椭圆齿轮机构的组合机构,并对其设计进行了阐述,它对开发新型的包装机构有较大的实用价值。 相似文献
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本文对六杆直线送料机构的包装机进行运动分析,并采用优化设计方法,追求滑块工作速度最均匀为优化准则,建立了该机构优化设计的数学模型。将此模型写入非线性规划计算程序,即可通过计算机的计算,找出最优的设计参数,并对优化结果进行了分析。 相似文献
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文章主要从双针缝纫机中送料处的切换机构分析研究,以期解决现有双针缝纫机送料处切换机构使用不方便、不通用等问题。该双针缝纫机中送料处的切换机构由两个离合机构组成,送料轴与摆轴之间设有大连杆机构,在大连杆与机体之间设有能使两者连接和分离的离合机构Ⅰ,下皮带轮处设有轮芯和带轮组成的内藏式离合机构Ⅱ。转换时只需操作离合机构Ⅰ和离合机构Ⅱ,同时更换针板和送布牙,即能实现送料状态的转换。该双针缝纫机送料处的切换机构不仅适用范围广,而且结构简单,成本低。 相似文献
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胜家299U型锁眼机是现代针织服装企业生产不可缺少的关键设备之一,却又是机械维修较复杂的一个机种。文中介绍该锁眼机送料机构的调整,如启动杆与离合器的脱开及接触、滑杆叉形连接器与滑杆锁定块的间隙、快速送料启动机构、快速送料启动杆及离合器运动机构的调整,并得出一套较为完整的有关该设备快速送料机构维修调整的要领及方法。结合相关资料及维修实践中的经验,阐述该送料机构常见故障产生的原因及排除方法,故障包括驱动离合器不工作,切开纽扣孔后按快速送料反复进行缝锁、缝纫系统不工作,在完成一个纽扣孔后快速送料重复运动,完成一个纽扣孔后机器停车不工作,快速送料离合器打滑不工作,工作压板关闭杆工作不正常,快速送料启动后启动架多次摆动,开纽扣孔后出现机器空转等。 相似文献
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针对目前椰子剥衣机送料部分主要靠人工运送的问题,为达到即时为椰子剥衣机提供椰子以及运送过程自动化,降低成本,提高效率的目的,介绍以一种椰子剥衣机为基础设计的椰子自动上料机构。由带传动负责椰子的输送,椰子的抓取靠机械手完成。采用伺服电机驱动,兼有气动装置控制。通过相互之间信号的产生和接收作为协调整个机构动作的前提。可以完成为剥衣机自动送料的任务。整个过程实现了自动化,效率较高,满足剥衣机的送料要求。 相似文献
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《Journal of food engineering》1988,8(4):247-272
The effects of screw configuration on the product properties, die pressure and screw torque in the twin-screw extrusion-cooking of maize grits is described. Extrudate bulk density, water solubility and water absorption were measured for a set range of extrusion moisture contents and barrel temperatures for each of four screw configurations of different conveying efficiencies.It is shown that screw configuration is a potent variable in determining product properties. The variation in water solubility with specific mechanical energy input conforms to Meuser's model. The screw configuration controls the specific mechanical energy input range. Screw configurations of low conveying efficiency give rise to low-viscosity melts which expand into low-bulk-density products. Dead-stopped runs showed that the conveying efficiency controls the degree of fill in the extruder barrel. Typically, the mean residence time was increased from 56 to 94 s by decreasing the conveying efficiency of the screws. 相似文献
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目的:探究熔体输送段正向螺纹元件间的不同组合对反向螺纹元件的熔体输送特性的影响。方法:通过改变导程构建两种不同模型,使用SolidWorks软件建立三维模型,使用Polyflow软件对两种模型在熔体输送段的挤出过程进行数值模拟,分析不同导程下螺纹元件的螺槽宽度及螺棱厚度对流场的影响及不同转速下流场的变化,通过实验验证转速对物料混合效果的影响。结果:所构建的模型均可使熔体通过反向螺纹元件;在相同螺杆转速下,由大导程螺纹元件构建的模型一建压能力和输送能力强于由小导程构建的模型二;模型一在分散混合能力上优于模型二,在分布混合能力上弱于模型二;在两端压差相同的情况下,增加转速可以提高物料的分散混合效果。结论:在聚乳酸改进加工过程中采用模型一且提高螺杆转速可进一步破碎物料,提高挤出物的质量。 相似文献
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Non-uniform heating is a major challenge for commercial applications of radio frequency (RF) technology in the food industry. To improve the RF heating uniformity of granular foods, a double screw conveyor was designed and used to investigate effects of conveying direction, screw rotation speed, filling ratio, and electrode gap on the heating rate and uniformity of jujubes. The results showed that there was no significant (p > 0.05) difference between forward and backward conveying directions both in heating rate and uniformity, while the RF heating uniformity gradually improved with the increased screw rotation speed. RF heating rate increased gradually with the increase of filling ratio or decrease of electrode gap. Except for the significantly higher λ value found in the filling ratio of 80%, no significant (p > 0.05) changes were observed between 20 and 60%. Furthermore, the λ values also increased with decreasing electrode gap. Quality evaluation indicated that there were no significant (p > 0.05) differences in the color values, texture properties, ascorbic acid, and moisture content between control and samples treated by RF heating under the double screw conveying. Overall, the results obtained from this study demonstrate that as a simultaneous mixing and moving equipment, the screw conveying can be considered as a promising approach in improving the RF heating uniformity of granular foods for industrial applications. 相似文献
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注塑螺杆熔体输送过程的工艺参数分析 总被引:1,自引:0,他引:1
运用注塑机螺杆熔体输送过程的相关理论,借助较为成熟的数学模型和几何模型,利用有限元分析软件ANSYS对注塑螺杆的熔体输送过程进行了模拟,讨论了螺杆转速和熔体压力对熔体输送过程的影响。根据讨论的结果选取了较为合理的工艺方案,并把该工艺方案的运用状况与模拟的结果作了对比。利用这种方法对塑化过程中的相应工艺参数的选取提供了一定的理论依据。 相似文献
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A Basic Model for a Twin-Screw Extruder 总被引:1,自引:0,他引:1
A model based on solving thermal balance and Stokes equation in a corotating twin-screw extruder with deep screw channels was developed. The present stage of the model described the evolution of temperature in the conveying section and the isothermal evolution of pressure in the melt pumping and reverse screw elements, with a Newtonian viscosity adapted to each part of the screw; residence time distribution in the whole extruder was also computed. Experimental validation was carried out on a pilot scale twin-screw extruder CLEXTRAL BC 45 fed with maize starch. Good agreement was found between the theoretical and actual temperature and pressure profiles, as well as with residence time distribution. In standard operating conditions (30 kg/hr, 200 rpm), the pressure generation in one C-shaped chamber was computed to be about 2.2 MPa, while pressure drops were about 0.3 MPa (intermeshing zone) and 0.5 MPa (reverse screw element) while the major part of the residence time per unit of screw length was spent in the reverse screw element. 相似文献