共查询到18条相似文献,搜索用时 640 毫秒
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在电子清纱器检测头工作原理的基础上,引入了对电磁铁的介绍,并运用拍合式电磁铁工作原理对磁路进行了分析、计算,并得出了电磁铁吸合力的计算方法。明确了电磁铁吸合力的计算、实验是电子清纱器检测头设计的重要基础环节,进而对电子清纱器检测头电磁铁的设计方法给出指导意见。 相似文献
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选针电磁铁作为选针器的核心驱动部件,直接影响电脑提花圆纬机的效率和产能。在采用公式经验法设计选针电磁铁结构参数的基础上,结合有限元分析法,对选针电磁铁进行建模分析。采用Ansoft Maxwell仿真软件对铁芯直径、永磁体宽度、激磁线圈高度3个结构参数进行有限元分析,得到最佳值,提出优化设计方案,并对优化后的方案进行动态响应测试。结果表明,优化设计方案后选针电磁铁的电磁力和动态响应特性得到明显提升,整机系统工作稳定,编织效率提高。该研究对国产选针电磁铁的优化及整机系统质量的提升具有参考意义。 相似文献
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文章利用多臂小样织机以玻璃纤维和芳纶为原料织造三维角连锁织物,并采用真空辅助成型法和手工成型法加工复合材料。对成型的复合材料进行弯曲性能测试,通过测试数据分析表明:织物组织结构、树脂浸透程度以及加工方法都会影响复合材料的弯曲性能。 相似文献
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针对针织机电气控制系统存在的逻辑性强,电磁铁干扰严重,接地要求高和连续运行时间长等问题,分析系统中干扰源的种类和产生的原因,据此提出了相应的抗干扰设计措施,具体包括使用交流滤波器和TVS减少电源干扰,使用光电耦合器、泄流二极管和灭弧器等减少电磁铁和控制继电器产生的干扰,使用FPGA/CPLD防止电磁铁误动作,通过良好的接地系统保证设备安全运行,采用看门狗技术和可靠性设计理念提高控制软件抗干扰能力,并将其综合应用于手套机电气控制系统中,实际使用表明获得了较好的抗干扰效果。 相似文献
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拉丝机调谐辊装置是直进式拉丝机各拉拔单元之间感应张力变化的机构,是各拉拔单元速度匹配的检测装置,该装置由调谐辊、摆臂、转轴、机架、小杠杆、气缸、位移传感器等部分组成。在使用中出现转轴转动不灵现象,拆出转轴后发现转轴表面及表面油槽处积满灰尘,摆臂及转动轴套之间无间隙等问题。分析原因后对调谐辊装置中转轴结构进行改进:增加轴向定位挡肩;将铜套式转轴改为轴承式;在摆臂与转轴连接处设计挡尘台阶;加大转轴直径。改进后未出现因调谐辊卡阻或转轴变形而不转的故障,提高了设备开机率和产品成材率,消除了人工操作的安全隐患。 相似文献
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基于PLC的超重多臂织机控制系统设计 总被引:1,自引:0,他引:1
介绍超重多臂织机控制系统的功能及软件与硬件构成,其多臂装置有20片综,分别由20支气缸控制拉钩升降,织机左右各有3个梭箱,且左右各有2个气缸控制梭箱升降传动装置,投梭方向则由安装在织机两侧的投梭吸铁控制。分析了利用PLC实现控制超重多臂织机的具体方法,采用光电编码器反馈织机主轴转角,TD200文本显示器作为人机界面,实现电子纹板的编辑输入和织机工作状态的监控显示,使织机具有电子多臂、电子多梭箱控制以及任意投梭控制功能,给出织机工作的时序图和控制系统主程序流程图。 相似文献
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Marianne Cockburn Matthias Schick Nicola A. Maffiuletti Lorenz Gygax Pascal Savary Christina Umstätter 《Journal of dairy science》2017,100(6):4914-4925
Musculoskeletal disorders have been a main concern in milkers for many years. To improve posture, a formula was developed in a previous study to calculate ergonomically optimal working heights for various milking parlor types. However, the working height recommendations based on the formula for the herringbone 30° parlor were broad. To clarify the recommendations for the optimal working height, we investigated the effect of working height on upper limb and shoulder muscle contraction intensities. We evaluated 60 milking cluster attachment procedures in a herringbone 30° milking parlor in 7 men and 9 women. Specifically, we examined the effect of working height on muscle contraction intensity of 4 arm and shoulder muscles bilaterally (flexor carpi ulnaris, biceps brachii, deltoideus anterior, and upper trapezius) by using surface electromyography. The working heights (low, medium, and high), which reflect the ratio of the subject's height to the height of the udder base, were used in the milking health formula to determine and fit individual depth of pits. Data were evaluated for each muscle and arm side in the functions holding and attaching. Statistical analysis was performed using linear mixed effects models, where muscle contraction intensity served as a target variable, whereas working height coefficient, sex, subject height, and repetition were treated as fixed effects, and repetition group nested in working height nested in subject was considered a random effect. Contraction intensities decreased with decreasing working height for the deltoideus anterior and upper trapezius, but not for the flexor carpi ulnaris or the biceps brachii muscles in both holding and attaching arm functions. We found that milking at a lower working height reduced muscle contraction intensities of the shoulder muscles. Women showed higher contraction intensities than men, whereas subject height had no effect. The study demonstrated that a lower working height decreased muscular load during milking. These lower working heights should be used within the recommendations made by the milking health formula for the herringbone 30°. Working heights could be adjusted effectively for milkers of varying body height. Future studies should therefore use the milking health formula as a tool to objectively compare and improve the accuracy of the working height coefficients. 相似文献
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Eduardo Garcia Breijo Valeria Guarrasi Rafael Masot Peris Miguel Alcañiz Fillol Cristian Olguin Pinatti 《Journal of food engineering》2013
The aroma emanating from fruits can indicate the maturity level and thus the quality and shelf life of the products. In this work it is presented an odour sampling system system (called also electronic nose), to classify the aroma of Diospyros kaki, whose working parameters can have variable configuration making the system flexible. The system can be appropriately reconfigured for each type of sampling. It is formed by a metal oxide semiconductor (MOS) commercial sensors matrix, which are individually controlled, being able to modify by software several parameters of their operating point. Working this way there is not a limited number of sensors but a very high number of virtual sensors. The system shows the ability to discriminate aroma of two Diospyros kaki cultivars. Moreover the instrument is capable to distinguish the fruits, inside the persimmon cultivar cluster, according to the ripe state after few days of storage. 相似文献
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为提高三维异型整体编织技术的自动化程度,进而提高编织效率,通过介绍编织底盘装置的工作原理,提出了一种底盘控制系统。该控制系统利用DMC5400A型四轴轨迹卡控制4组步进电动机驱动整行(列)携纱器纵横步进循环运动,并结合STM32F103型微控制器控制直流电磁铁定位机构完成异型编织动作实现可控增减纱携纱器工作。选用IOC1280 10型扩展卡控制位置传感器实现底盘运动状态检测,利用MFC中基于对话框的应用程序开发的操作界面实现对多种异型预制件自动编织。对底盘控制系统的硬件组成和异型编织的工作过程进行试验验证。结果表明,利用这种底盘控制系统结合人机交互界面所进行的编织工艺,可实现异型预制件的自动编织具有较高的应用价值。 相似文献
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基于CCD的片烟规格测量装置的设计应用 总被引:1,自引:0,他引:1
现使用的打叶后烟叶面积的测量方法是人工采样、筛选分级、称重,以及计算每个面积段的片烟比例。该检测方法为离线检测模式,其测定结果滞后,无法及时指导生产。为此,设计了基于CCD(Charge-coupled device)图像传感器的片烟规格测量装置,通过测量片烟的面积比反映打叶效果。该装置由工作平台、弹簧板、电磁铁和衔铁组成片烟分散装置;光源置于镜头正下方,与工作平台构成图像采集部分。在单片机的控制下,CCD图像传感器与片烟分散装置协调工作,每个周期采集一帧数据,采用二值化电路将视频信号转换为二进制数据,并完成片烟面积计算和比例统计工作。与传统的称重测量法相比,该装置能够及时、准确、自动测量片烟的面积并统计各个面积段的片烟比例,为打叶工序工艺参数的快速调整提供了依据。 相似文献