大型双层异线性振动筛模态计算与试验分析

通过建立有限元计算模型,在设计阶段对一种新型32 m2异线性双层振动筛进行了模态计算。计算结果与样机模态试验结果进行了比较,二者吻合较好,说明有限元模型的建立及参数的选择是合理的。模态计算结果为大型双层异线性振动筛制造前的性能预估提供了可靠依据。将试验测试所得到的数据进行传递函数分析,通过分析传递函数集总显示图,结合模态计算数据,提出了振动筛工作频率的合理选取范围。

ZS6型钻井液线性振动筛研制

ZS6型线性振动筛采用双电机反向自同步旋转作为激振源 ,实现筛箱振型为线性振动。与传统圆轨迹振型的振动筛相比具有诸多优点 ,特别是 ZS6型线性振动筛使用了寿命较长的板式叠层粘接筛网 ,大大提高了钻井液固控水平。现文详细阐述了 ZS6型线性振动筛的基本工作原理、结构、性能特点、工作参数、室内试验与现场使用效果等。还特别阐述了板式叠层粘接筛网的结构特点。

异线性振动筛在田庄选煤厂的应用试验

介绍了异线性振动筛的工作原理,总结了30m2共振筛的使用维护经验以及对大型异线性振动筛的发展启示,指出影响大型异线性振动筛发展的主要因素有弹性系统问题,操作人员的技术水平,设计、加工制造与使用问题,论述了目前32m2双层异线性振动筛研究与发展的成果。

大型异线性振动筛的研究与应用

介绍了异线性振动筛的工作原理,结合田庄选煤厂实际情况,总结了大型异线性振动筛的发展历程,论述了田庄选煤厂32m2双层异线性振动筛创新及应用情况,为我国筛分机械的大型化、国产化提供了新的发展思路。

大型异线性振动筛的研究与应用

介绍了异线性振动筛的工作原理,结合田庄选煤厂实际情况,总结了30m2共振筛使用维护经验和对大型异线性振动筛的发展启示,论述了田庄选煤厂和天津大学研究与发展32m2双层异线性振动筛采用的先进方法和成果以及在田庄选煤厂的应用情况。

让矿石更精细 浅谈蒂森克虏伯破碎筛分技术与装备

现代的工业生产及民用设施会用到许多原材料,比如煤炭、钢铁、铜、镍、钼、铅、锌、金及银等。除煤炭及金属类矿石,自然界还存在各种各样的岩石,而这些岩石也是我们生活中不可或缺的原材料,需要通过开采和加工才能获得。原材料按硬度可分为硬岩(包括花岗岩、闪长岩、辉长岩、安山岩、

Application of experimental modal analysis technique to structural design of linear vibrating screen

A large model of the screen was mounted in the laboratory for studying its modal performance. The model is suspended with steel ropes. Modal test was carried out with artificially exciting by 500 g impacting hammer and 100 kg exciting force shaker respectively. Synthesis and correction of the modal parameters are obtained from both testing methods. Design faults of vibrating screen were determined based on the analy-sis and dynamic correction of structure approaches about the screen was put forward finally.

Dynamic analysis and simulation of four-axis forced synchronizing banana vibrating screen of variable linear trajectory

A new concept of banana vibrating screen which has the same effect as traditional banana vibrating screen in a new way was put forward.The dynamic model of vibrating screen was established and its working principle was analyzed when the action line of the exciting force did not act through the centroid of screen box.Moreover,the dynamic differential equations of centroid and screen surface were obtained.The motions of centroid and screen surface were simulated with actual parameters of the design example in Matlab/Simulink.The results show that not only the amplitude has a significant decrease from 9.38 to 4.10 mm,but also the throwing index and vibrating direction angle have a significant decrease from 10.49 to 4.59,and from 58.10° to 33.29°,respectively,along the screen surface,which indicates that motion characteristics of vibrating screen are consistent with those of traditional banana vibrating screen only by means of a single angle of screen surface.What's more,such banana vibrating screen of variable linear trajectory with greater processing capacity could be obtained by adjusting the relative position of force center and the centroid of screen box properly.

A new single degree-of-freedom resonance device

A new single degree-of-freedom （1 DOF） resonance device was developed. It mainly comprises a linear motor, a vibrating screen, a supporting spring set, a supporting frame and a damper set. Forces acting on the vibrating screen were found. A differential equation for describing the forces was set up. Equations that were used to evaluate the exciting force and exciting frequency in resonance were derived from the solution to the differential equation. In addition, an equation for evaluating the deformed magnitude of the damping springs in the damper set was presented so that the suitable damping may be obtained. Finally, a Matlab/Simulink model of the new i DOF resonance device was also built. Displacement-time curves of the vibrating screen under four conditions were obtained in the use of the Matlab/Simulink simulation. The curves indicate that it can shorten the time for the vibrating screen to be into the stable resonance with increasing the damping, and it can lengthen the time with increasing the vibrated mass or amplitude, but every given angular frequency cannot acquire the desired amplitude value of resonance.

A study of particles penetration in sieving process on a linear vibration screen

This paper presented an investigation of particle collision and penetration using the discrete element method to understand the motion of particles and improve theoretical treatment in the sieving process. The process progressively was divided into looseness, stratification, collision, and penetration. Particle penetration has a direct effect on the screening performance. The penetration probability was defined, and the mathematical relationships between particle penetration and vibration parameters were established using the least squares method. To obtain the ideal penetration probability for materials the amplitude and frequency should preferably be near 3.0 mm and 25 Hz, respectively. The vibration direction angle has only a slight effect on penetration. The stage of the screening process from 0.1 to 0.7 s is the primary region for collision and penetration. This paper focused on the sieving process to more fully understand how particle collision and penetration influence the screening efficiency.

Screening efficiency and screen length of a linear vibrating screen using DEM 3D simulation

The effect of screen length on the screening efficiency of particles is studied under various single parameter conditions including frequency, amplitude, vibration angle, and screen inclination. The Discrete Element Method (DEM) has been used to simulate the screening process. A functional relationship between screening efficiency and screen length is established. It is shown that screening efficiency and screen length have a complicated exponential relationship. Relationships between them are profoundly discussed and conclusions are easily drawn: low values of the parameters do not benefit screening; screening efficiency generally increases with screen length; screening efficiency reaches a plateau when these parameters are in range frequently encountered in practical applications.