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定位辊实时相位测量精度是决定数字刀式压痕机压痕精度的关键.本研究提出了一种数字刀式压痕机输纸定位辊的实时相位测量系统.系统采用正交编码器和高速数字信号控制器实现对定位辊转角相位的实时显示与数据采集.实验结果表明,该系统检测实时性强,并具有较高的测量精度,可以实现对数字压痕机压痕精度的检测. 相似文献
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编者按:在切料过程中,为了使飞刀与底刀间的距离始终保持一致,提高切料合格率。本刊1987年第《期曾刊出《为什么把切草机刀刃磨成弓形》一文,这里再介绍一种较简单的磨刀方法。辊式切料机一般用于稻草、麦草产秆、芦苇、竹壳、麻料等原料的各料。为了减轻辊式切料机刀辊在运行过程中所受的瞬间冲击,设计时飞刀与刀辊轴线成《~7”角安装,底刀与飞刀的刀刃都为直线形的。4。此的刀形是无法使底刀与飞刀间的距离保持在0.3~0.smm的,我们通过作留法很容易发现这一问题。、+。圈1所示,AB线为飞刀刀刃线,作刀较轴线的平行线AC,则… 相似文献
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《现代纺织技术》2020,(5)
针对无缝内衣机转速控制不稳定造成细针距高弹性针织内衣编织密度不匀、布面容易局部松散的问题,就无缝内衣机编织工艺、速度参数的链条文件表达、细针距高弹性针织内衣的编织特点以及伺服电机控制方式进行研究,提出一种基于工艺参数的无缝内衣机速度动态控制方法。采用速度闭环控制的思路,实时采集内衣机针筒针位信息,根据工艺文件中的速度链条参数,动态调控内衣机主轴转速,实现高转速下细针距高弹性针织内衣编织的密度均匀化控制。阐述了伺服驱动及针位检测电路的硬件设计,人机链条速度获取程序、速度检测程序及速度执行程序的软件开发。结果表明,这一控制技术应用在细针距无缝内衣机上,生产的细针距高弹性针织内衣组织结构一致性好,密度均匀。 相似文献
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<正>刀辊式切草机用于制浆造纸企业备料工段切断各种草类原料。其刀辊组件包括有刀辊和均匀排布在刀辊圆周上的多条纵贯刀辊的飞刀,随刀辊高速旋转的飞刀与固定在刀辊一侧的底刀配合,使进入剪切区域的草类原料被切断。对于切断麦草等脆性原料,不均匀的刀口间隙影响不大,但对切断稻草、龙须草等韧性较强的原料则影响较大,造成间隙较大处切不断或切断质量较差,不能满足后续工段要求。支撑刚性低, 相似文献
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在生产中如何在有限的甘蔗资源中提高糖分的收回率是各糖厂挖潜技术改造设备的关键所在。压榨提汁工段中提高压榨抽出率是一种有效的手段,其中提高甘蔗的破碎效果是提高生产规模和压榨抽出率的重要措施。现大多数糖厂使用的甘蔗预处理设备为转鼓式蔗刀机(切撕机),通过2~3台切撕机的组合,甘蔗破碎度普遍达到70%以上,如果对甘蔗预处理环节进行技术改造,甘蔗破碎度可达到85%~90%。本文从影响甘蔗破碎效果的主要环节讨论提高甘蔗破碎效果的措施。 相似文献
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一、概况 竹子备料工艺设备一般用传统的盘式、辊式及鼓式削片机。美国Peadco公司介绍的竹子撕碎工艺设备效果较好,但没有成熟的竹子撕碎机可供应用。当前,国内大部分竹浆厂仍采用竹子削片机,但该机切料质量较差,对蒸煮质量有一定的影响,单位产量的能耗也较高。镇江轻工业机械厂新近设计试制的ZCQ22刀辊切竹机,具有消耗功率较低,切片分层良好等优点,目前该机已通过了鉴定。 相似文献
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Influence of process parameters on air speed in fibre transport duct of the DREF-III machine: Part I
《纺织学会志》2013,104(5):401-408
Abstract The present work deals with the measurement of air flow in the transport duct of the DREFIII friction spinning machine. In this work, the direction and speed of air inside the transport duct was measured with the help of a three-hole probe. Turbulence in the air flow was assessed with the help of a tuft probe. The influence of opening roller speed, drum speed difference and suction air pressure was studied on air speed inside the transport duct. The results show that air flow near the inlet zone of the duct is highly turbulent and there are large deviations in air velocity and direction of air flow. The middle zone of the inlet of the duct has much more streamlined flow. However, the variation in air speed and direction of air flow is comparatively less near the duct. It is also observed that air velocity in the duct is mainly influenced by the opening roller speed followed by suction air pressure. Drum speed difference does not have significant influence on the air velocity in the duct. 相似文献
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速度链是分部传动造纸机中连接各分部所需速度给定的一个关键控制单元,速度链的控制方式在实践过程中有了部分修改,使速度链更加容易地在纸机传动控制中实现. 相似文献
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Impact of Excitation and Material Parameters on the Efficiency of Ultrasonic Cutting of Bakery Products 总被引:2,自引:0,他引:2
Susann Zahn Yvonne Schneider Gregor Zücker Harald Rohm 《Journal of food science》2005,70(9):E510-E513
ABSTRACT: Cutting with tools excited by ultrasound is increasingly applied in the food industry, especially for cheese, confectionary, and bakery products. Due to the lack of a thorough understanding of the separation process, most of the ultrasonic cutting systems are designed and applied on the basis of empirical knowledge. The aim of the study was to elaborate the impact of ultrasonic parameters, that is, amplitude and frequency, on the cutting process, and special emphasis was placed on resulting effects in the close vicinity of the cutting edge, which are reflected by the separation forces. To allow a direct investigation of the mechanical separation without artifacts due to secondary effects such as melting and cavitation, the crumb of different bakery products (for example, dark and white bread, yeast dumplings, and cake) were analyzed. The results show that the influence of ultrasonic amplitude and frequency can be expressed by the maximum vibration speed on the cutting edge. For each product, an increasing maximum vibration speed results in a particular reduction of the cutting force and an increased quality of the cut. The magnitude of the cutting force reduction is inversely related to a material-specific parameter cx , which was calculated from the mechanical properties according to the speed-of-sound concept. Therefore, the determination of cx allows a specific adjustment of ultrasonic amplitude and frequency to achieve optimum cutting quality. 相似文献
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为了解决推纸器式裱纸机在工作过程中推纸器冲击造成的纸张堆积、定位精度不高等问题,对其输送过程进行了运动分析,得出推纸器输送面纸的要求,在动力学分析的基础上,提出两种推纸器速度的控制方案:脉冲速度控制和连续速度控制,运用多项式拟合的MATLAB程序求出二次曲线与三次曲线,并利用积分法验证了二次曲线的控制方案,在承受相同的冲击下,可使机器的速度得到提高。 相似文献