共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
3.
龚浏澄 《现代塑料加工应用》1991,(1):53-55
挤出与注塑是塑料成型加工中应用最广的两类成型工艺,螺杆是其关键部件,因而对螺杆结构的研究是至关重要的。就单螺杆而言,目前已有各式各样的螺杆,近年来国外在原有的分离型、混炼型螺杆的基础上,又开发出螺杆套螺杆的双螺杆型,压缩—减压型的单螺杆。压缩—减压型螺杆又有能量传递式(ET)螺杆和波状螺杆。波状螺杆与普通单螺杆一样,仍分固体 相似文献
4.
5.
短幅内摆线型螺杆-衬套副滑动速度分析 总被引:1,自引:0,他引:1
《化工机械》2015,(4):522-526
单螺杆式水力机械中螺杆-衬套副的滑动速度是影响其磨损程度和使用寿命的重要因素之一。在分析线型设计方法和运动规律的基础上,针对短幅内摆线型螺杆-衬套副推导出螺杆-衬套副螺杆齿凸接触点和齿凹接触点的相对滑动速度公式并进行应用,得出螺杆-衬套副滑动速度的变化规律,为单螺杆式水力机械的磨损、寿命研究和优化设计提供理论基础。 相似文献
6.
7.
利用EDEM软件对一种普通锥形和两种双锥型螺杆挤出机固体输送段进行模拟.分析了高密度聚乙烯(PE-HD)颗粒在锥形双螺杆挤出机内的运动状态和分布规律.对比分析了3种锥形螺杆挤出的质量流速率、填充率、平均速度、平均压力、平均剪切应力和力矩等参数,给出了普通型和双锥型螺杆挤出机固体输送机理以及主要影响因素.结果表明,相比于... 相似文献
8.
《内蒙古石油化工》2015,(17)
螺杆钻具旁通阀是螺杆钻具的主要部件之一,主要起着沟通钻柱内通道和井筒环形空间的作用,在起下钻作业过程中保证钻柱内泥浆顺利泄到井筒环形空间,防止泥浆溢出污染井台。前期现场试验表明,螺杆钻具旁通阀质量的好坏,直接关系着螺杆钻具的稳定性和可靠性,关系着螺杆钻具井下作业施工的成败。本文针对单螺杆钻具旁通阀的基本结构组成和工作原理,分析总结了单螺杆钻具旁通阀的常见故障,提出了单螺杆钻具旁通阀的结构改进方案,极大的提高了螺杆钻具工作时的稳定性和可靠性,最后从流体力学的角度推导了螺杆钻具旁通阀开启流量的计算公式,并进行了设计实例实验验证,为螺杆钻具旁通阀的结构设计提供了理论依据。 相似文献
9.
10.
WalterMichaeli 《塑料挤出》2003,(4):12-15
单螺杆挤出机中动态剪切和混炼元件的作用是使熔体均化。一定混炼构型的工作性状随着挤出量和螺杆转速而变化。试验台试验和有限元网络模拟(FEA)都可评价这种混炼构型。 相似文献
11.
12.
Theoretical model for intermeshing twin screw extruders: Axial velocity profile for shallow channels
Charles E. Wyman 《Polymer Engineering and Science》1975,15(8):606-611
Positive displacement intermeshing twin screw extruders have been analyzed by a simple model for flow in the channel formed by the screw root and screw flights. The model considers the down channel flow to be a combination of drage flow resulting from the relative motion of the barrel and screw and pressure flow resulting from the positive displacement action of the device. The pressure flow in this situation is distinguished from pressure flow in a single screw extruder in that the pressure forces induce flow toward the die for the twin screw model rather than away from the die as in a single screw extruder. Comparison of the down channel shear rate profile of apositive displacement twin screw extruder with that of a single screw extruder with no net flow reveals that they are identical but inverted with respect to channel depth. The model presented does not consider leakage between the twin screws or the rotational motion of the second screw. 相似文献
13.
14.
15.
A novel melting model for single screw extruders with a grooved melting zone was established. The whole solid plug, which came from the grooved feed zone, was ruptured and melted mainly by continuously changing the volume of the barrel grooves and the screw channel in the grooved melting zone. A new single screw extruder platform with hydraulic clamshell barrels was constructed to investigate the melting of solid polymer with different combinations of barrels and screws. The melting model was verified by experiments. The results showed that the melting started earlier and finished in a shorter length for single screw extruders with a grooved melting zone than that for conventional single screw extruders and the melting efficiency was improved by introducing a grooved melting zone to a single screw extruder. The theoretical values are consistent with experimental results. The novel single screw extruder with grooved melting zone can dramatically increase the plasticizing efficiency and the throughput. 相似文献
16.
通过机理分析法求取了单螺杆挤出机的传递函数——机头压力与螺杆转速之间的动态关系,并通过系统辨识法对其结果进行了验证。结果表明单螺杆挤出机的传递函数是一个比例环节。利用此结果和闭环系统中其他环节的传递函数,给出了挤出机压力-转速闭环控制系统的数学模型。 相似文献
17.
This review is designed to be a comprehensive source for single screw extruder research in the scope of particulate filled composite. This review includes factors effecting processing of particulate filled composite using a single screw extruder. The mixing requirements for a particulate filled composite analyzed and discussed in terms of single screw extrusion. The factors for achieving effective mixing of this type of composite are also discussed. 相似文献
18.