橡胶密炼机混炼工艺瞬时功率控制法

橡胶密炼机混炼工艺瞬时功率控制法的理论由３部分组成：橡胶混炼过程的机理、密炼机流理论和混炼过程功率曲线与能量控制法不同，瞬时功率控制法实质上是控制混炼过程中胶料的粘度，确保混炼工艺过程保持最佳状态。因而瞬时功能控制法可监控生产过程，为密炼机混炼工艺的智能控制奠定了基础。     

密炼机全自动混炼的瞬时功率控制

密炼机瞬时功率控制的实质是控制混炼物料的粘度。采用瞬时功率控制可减小混炼胶的门尼粘度波动。全自动控制混炼过程中．混炼过程参数．如转子转速、填充因数、压砣压力和胶料温度对混炼胶质量有影响；采用瞬时功率控制可以减小一些因素的影响．但并非对所有因素的影响都有效。MLJ-300密炼机智能控制系统可以实施瞬时功率控制，最佳效果是将胶料门尼粘度波动范围控制在-3～ 3。     

密炼机混炼工艺瞬时功率控制与其他控制方法的比较

本文通过实验，对胶鞋胶料的混炼过程采用了三种不同的控制方法，即时间控制．能量控制和瞬时功率控制，并对实验结果进行了分析。从实验结果统计、分析和实例证明，用瞬时功率控制混炼过程，只要控制各关键阶段，即生胶共混程度、填料混入程度和混炼程度的瞬时功率值，密炼机生胶塑炼过程控制排胶时的瞬时功率值，就可使混炼胶、塑炼胶达到恒粘度控制，排除粘度波动对胶料塑性的影响，提高胶料的达标率。     

密炼机瞬时功率控制法的应用

探讨了橡胶混炼的各种控制方法,阐述了瞬时功率控制法的原理：通过控制橡胶混炼中的转子轴做功的功率来控制混炼胶的质量。以ＭＬＪ－３００密炼机微机智能控制系统为工具,采用瞬时功率与温度综合控制方法控制混炼过程,大大提高混炼胶质量的稳定性。     

密炼机橡胶混炼结束前瞬时功率与混炼胶粘度的关系

密炼机橡胶混炼结束前瞬时功率与混炼胶粘度的关系张海，贺德化，马铁军，赵良知李华，蔡群英（华南理工大学５１０６４１）蔡大扬，邹明清（广州珠江轮胎有限公司５１０８２８）密炼机橡胶混炼工艺瞬时功率与混炼胶粘度η的关系，已由密炼机的流变学分析确定。在Ｂｅｒｇ...     

建议采用瞬时功率控制法提高混炼胶质量

密炼机橡胶混烧工艺通常采用时间、能量、瞬时功率等三种方法进行控制。时间控制法所获得的橡胶混炼塑性合格率较低，瞬时功率控制法获得的合格率最高，其曲线反应了橡胶混烧过程各工序应取的最佳条件。     

密炼机橡胶混炼工艺的瞬时功率控制法

密炼机橡胶混炼工艺的瞬时功率控制法可对混炼过程中的胶料粘度进行直接控制,与能量、温度和时间控制有本质的区别。该方法抗干扰性和自动调节能力强,可使混炼过程保持最佳状态,并可在混炼过程中预知混炼胶的粘度。本文论述了瞬时功率控制     

密炼机橡胶混炼工艺智能控制的设想

论述密炼机橡胶混炼工艺智能控制的重要性,自动控制只有智能化才能确保混炼工艺优良,质量合格,指出了智能控制的条件,内容和途径,采用瞬时功率控制法及其控制系统ＭＧＫＪ可实现混炼胶质量自动在检测和混炼工艺自动优化等单台密机混炼工艺的智能控制。     

密炼机混炼工艺的回顾与展望

主要探讨了密炼机混炼工艺的理论,物料在密炼机混炼中属于液体行为,符合黏度的流变规律,可以通过瞬时功率来进行控制。另外,重点对一次法炼胶工艺进行了一些介绍,从工艺发展来看,近期重点是进一步完善低温一次法炼胶工艺,实现智能混炼。     

XHM－140／20型密炼机中胶料混炼工艺分析

应用密炼机中胶料混炼和流变理论，采用ＭＧＫＪ密炼机微机监控系统对混炼过程进行监测。对混炼过程功率曲线和有关参数进行统计分析，建议在整个混炼过程中控制好三点：加填料的ａ点，结束混炼的ｅ点和扫粉的ｄ点。建议在现有设备和新建设备上采用先进的ＭＧＫＪ密炼机微机监控系统。     

密炼机混炼工艺参数对焦烧影响的初步研究

通过对一种胎面胶三段混炼过程参数统计分析,指出塑炼段和第２段混煤过程对混炼胶焦烧性能影响较大,混炼能量消耗与焦烧的相关因素比与时间、温度和功率的都大,而温度与焦烧的相关因素有正有负,影响比较复杂。分别使用三段混炼过程全部参数、塑炼段和第３段混炼的参数和只用第３段混炼的参数回归建立预测焦烧的数学模型,复相关因数分别为０．９４１,０．８３５和０．８１４,预测平均相对偏差分别为１２．９％,９．９４％和１     

Mixing of a wet granular medium: Influence of the liquid addition method

Mixing is an important operation in the elaboration of concrete. This process generally involves high energy consumption. The method by which the liquid is added influences this consumption. The liquid can be added progressively with a constant flow, instantaneously at the beginning of the mixing process, or in several stages.Our results show that the power usually consumed with a progressive liquid addition can be reduced by adding liquid in several stages, by modifying the number of additions and by varying the amount of liquid added for each addition.For a final-state mixture, oversaturated in liquid, instantaneous addition provides the lowest energy consumption. However, for a final state that is less saturated, the lowest energy intensity is obtained by adding the liquid in two stages. The first amount corresponds to a saturation rate located in the funicular regime, and is higher than the second amount.Finally, for saturation states located before the capillary regime, a progressive increase in the energy signal is observed after an instantaneous addition of the liquid. Moreover, the capillary state is obtained using an amount of liquid for which this state is not usually reached by progressive addition. This phenomenon is more pronounced where the particle size is reduced and the rotation velocity increased.     

Characterization of the granular-to-fluid state process during mixing by power evolution in a planetary concrete mixer

Adding product into the mixer exerts a strong and rapid impact during concrete mixing. Experimental data obtained from a planetary mixer in a full-scale concrete plant under laboratory conditions show that the state of mixture progress with mixing time is well described by the mixing power evolution. More specifically, a reliable method for detecting the time corresponding to the transformation of a mixture from a cohesive granular material into a granular paste (i.e. the so-called “transition time”), through use of a mixing power measurement, will be presented herein. Moreover, once this transition has been achieved, mixing power consumption will be related to mixture rheology and then to mixer geometry by means of a simplified hypothesis. This equation can also be obtained via a dimensionless analysis. Lastly, it will be shown that mixture behavior beyond the transition point is well fitted by a hyperbolic equation. The corresponding mixing power evolution can then be predicted by the level of power at this transition time. These results are suitable for application to online process monitoring.     

EXPERIMENTAL STUDY ON MIXING: POWER CONSUMPTION AND DEGREE OF SUSPENSION

An experimental study on mixing, degree of suspension and power consumption in solid-liquid suspensions was done. A system similar to those found in anaerobic fermentation processes of animal manures was used, and an existing mixing equipment was adapted for the study. Power consumption and degree of suspension for both mechanical mixing and mixing by gas was determined. The influence of variables such as geometry, solids concentration, stirrer velocity, and gas velocity was studied, discussed, and compared to data from the literature. Best results were obtained for gas mixing, the power consumption being about one fourth of that required by mechanical agitation. Finally, extended correlations relating Power and Reynolds numbers for mechanical mixing and mixing by gas are proposed.     

Mixing energy investigations in a liquid vessel that is mixed by using a rotating magnetic field

The purpose of the present report is, first, to develop the basic equations and similarity criteria governing the mixing system with the magnetic particles under the effect of a rotating magnetic field (RMF); second, to carry out the experimental investigations dealt with the power consumption and mixing time under the action of RMF. Dimensionless correlations are proposed to predict power consumption and the mixing time in the analyzed mixing system. The study relates to the mixing energy defined as the product of the power input and the mixing time in a tested experimental set-up. The data obtained for mixing efficiency was correlated in terms of the modified Reynolds number which can be used for predictions of mixing process in systems with the magnetic particles. The magnetic particle may be treated as a miniaturized mixer and it may offer a unique alternative approach to mixing. The satisfactory comparison indicates that the mixing process under the action RMF has the significantly higher of the energy consumption than the classical agitators.     

注塑机塑化参数对能耗的影响研究

通过对料筒平均温度、背压、转速建立正交试验表,模拟计算这些因素对能耗的影响程度,得到注塑一个产品在不同参数下需要消耗的功率和各参数对能耗的影响程度,然后通过实验验证模拟结果,证实了该研究方法的正确性及可靠性,该方法为注塑节能和塑化参数方案的确定提供一定依据.     

“全回流”间歇精馏塔顶贮槽内液体流动时的混合

引　言2 0世纪 80年代末 ,余国琮、杨志才等[1] 参照连续精馏开工过程的操作方法提出并实验证明了一种新的间歇精馏操作方法———塔顶累积全回流法(本文简称“全回流”) .采用此法 ,笔者[2 ] 最近推导出在理想操作条件下间歇精馏二元理想混合物精馏过程中塔顶贮槽内液体流动为完全混合时最小汽化总量计算法 .由于采用此法 ,塔顶贮槽内存液量可能很大 ,往往必须考虑塔顶贮槽内液体流动时的混合程度 .本文以多级串联混合模型的级数表示采用此操作方法塔顶贮槽内液体流动时的混合程度 ,以在理想操作条件下间歇精馏二元理想混合物为例 ,通过举…     

Concrete mixing kinetics by means of power measurement

This paper introduces a new model for concrete mixing kinetics. The model defines five successive stages through which the mixture characteristics change. It is also shown that the time-variation of the mixer power consumption is a relevant tool to identify the transient stages of the mixture during mixing. In particular, it detects the instant when maximum cohesive paste occurs and identifies the fluidity time. The fluidity time is the instant when mixture turns to fresh concrete. In that sense, this transition time can be seen as an indicator of mixing difficulty for a given mixer. The influence of the mix-design and that of the liquid loading sequence on the mixing behavior are investigated; three sets of experiments are used for the assessment of the model. It is shown that one key parameter is the rheology of the mixture at the fluidity time.