共查询到18条相似文献,搜索用时 187 毫秒
1.
通过对颚式破碎机动颚运动轨迹的分析,提出传统的颚式破碎机的啮角设计概念有很大的局限性,认为它没有真实地反映颚式破碎机的工作状况,进而提出啮角设计的新概念——工态啮角。 相似文献
2.
3.
通过UG软件对颚式破碎机进行建模及运动仿真,介绍如何模拟动颚的往复摆动,分析动颚的摆角、速度、加速度,获得机构的行程速比系数。 相似文献
4.
大破碎比颚式破碎机及对破碎工艺流程的变革 总被引:4,自引:1,他引:3
介绍了新型破碎设备--外动颚大破碎比颚式破碎机及该系列产品的技术参数、性能特点;可用一段大破碎比破碎机取代传统流程中的两段或三段破碎,新型破碎设备的研制成功带来了破碎工艺的变革。 相似文献
5.
颚式破碎机由于其工作性质的特殊性,在使用时会产生很大的噪音和振动,这些因素会导致机器关键零部件产生疲劳损伤,影响整个机器的结构特性和工作稳定性,间接影响着日常的作业环境和工作效率,严重的振动甚至能对机器自身造成不可修复的破坏,进而影响使用寿命。振动是影响仪器设备正常工作的关键因素,强烈的振动会对破碎机的转速校准精度造成显著影响。因此,为降低颚式破碎机的振动频率,通过对颚式破碎机进行系统建模,并采用C++编程辅助计算,分析了机械系统的振动来源,应用机械系统动力学相关知识,对系统惯性力进行分析,并对破碎机结构进行优化:通过改变破碎机飞轮的偏心配重以及配重角度,使得偏心轴、飞轮和大带轮的质心满足颚式破碎机运动构件的质心运动方程。实验表明,该方法能够将系统的惯性力降低到优化前的三分之二。 相似文献
6.
7.
8.
双腔颚式破碎机动态破碎力分析 总被引:1,自引:0,他引:1
为提高双腔颚式破碎机破碎力计算的准确性,使用速度瞬心法,分析双腔颚式破碎机偏心轴旋转360°动颚的运动规律及破碎腔的变化规律,提出有效破碎腔折算系数,并对破碎力的变化规律进行分析.结果表明,破碎力随有效破碎腔的变化呈周期性变化,修正了最大破碎力计算公式,得出双腔颚式破碎机在偏心轴转至(水平向右逆时针转起)170°时左腔破碎力达到最大值,转至350°时右腔破碎力达到最大值.对完善双腔颚式破碎机的基础理论有重要意义. 相似文献
9.
10.
冲击式粘土破碎机和湿粘土质原料破碎烘干机汪一佛(中国建筑材料科学研究院,北京100024)1湿粘土破碎机的工作原理和技术性能1.1工作原理破碎机是由带三个活动辊和板锤转子体等部件组成的破碎系统。它主要借助高速旋转转子体上的板锤,冲击湿土块进行破碎,被... 相似文献
11.
J. O. Olawale S. A. Ibitoye M. D. Shittu A. P. I. Popoola 《Journal of Failure Analysis and Prevention》2011,11(6):705-709
In this article, we report the outcome of an investigation made to uncover the premature fracture of crusher jaws produced
in a local foundry. A crusher jaw that had failed while in service was studied through metallographic techniques to determine
the cause of the failure. Our investigation revealed that the reason for the fracture was the presence of large carbides at
the grain boundaries and in the grain matrix. This led to the formation of microcracks that propagated along the grain boundaries
under in-service working forces. It is also believed that the precipitation of carbides at the grain boundaries may have occurred
because of improper heat treatment, but not because of a deficiency in composition. 相似文献
12.
A.W. Momber 《Forschung im Ingenieurwesen》2005,70(2):120-127
Based on quasi-brittle fracture models, a brittleness parameter is derived which characterises the resistance of concrete materials against mechanical fragmentation. Fragmentation tests in a laboratory jaw crusher are performed to verify this parameter. The brittleness parameter includes compressive strength and maximum aggregate size which can both be evaluated easily in practice. Resistance against mechanical fragmentation decreases if values for the brittleness parameter increase. 相似文献
13.
为了研究井下移动式破碎机在破碎头受随机载荷作用下垂直方向的振动特性、探究其工作可靠性低的原因,通过假设与简化,根据多体动力学理论,建立了其动力学模型和垂直方向的运动方程,运用虚拟激励法推导了破碎机垂直向振动响应的数学模型.以国产某型井下移动式破碎机为研究对象,分析确定了破碎头冲击岩石时的随机载荷,运用MATLAB语言程序,得到该破碎机在高位时受随机载荷作用下破碎头、支臂与机身在垂直方向的随机振动响应.结果表明:在载荷峰值为375 kN、均值为186 kN、频率为10 Hz的随机激励作用下,该机各部振幅峰值与均值分别为:破碎头:0.0125 m,0.007 25 m;支臂:0.010 m,0.006 57 m;机身:0.006 1 m,0.003 62 m,可见各部振动比较剧烈.破碎头振动和波动最大,支臂次之,机身最小,与实际情况相符.当各部件振幅达最大时,破碎头、支臂与机身的低频与固有频率接近,容易发生共振,这是导致机器振动剧烈,引起零部件、元器件失效,使用寿命下降的主要原因.所得结论为改进移动式破碎机设计、采取合理的减振措施、延长破碎机使用寿命提供参考. 相似文献
14.
15.
Magdalena Kimm Nils Gerstein Patricia Schmitz Martin Simons Thomas Gries 《Materials and Structures》2018,51(5):122
This paper presents the results of recent experiments on the recyclability of the textile components in textile reinforced concrete (TRC). TRC as a multi-component system often contains organic ingredients such as carbon fibres and polymer impregnations. Consequently, the recycling of TRC is not trivial and has not yet been sufficiently clarified until now. In this study, an impregnated, bi-axially reinforced, and warp-knitted textiles made of carbon fibres was used in combination with a fine grained concrete. Flexural tests on TRC specimens containing recycled epoxy-impregnated carbon reinforcement were performed, whereby the recycling was simulated by a pre-treatment of the carbon fibre material in a jaw crusher. The results showed a pronounced decrease in flexural strength compared to untreated carbon reinforcement. Moreover, three different crushing methods were investigated with respect to their influence on the recovery of styrene-butadiene-rubber impregnated carbon textiles. Besides jaw crushing and impact milling, crushing with a hammer mill showed the best degree of purity but also caused the highest mechanical damage to the textile. The impact of material, structure of the composite and crushing methods on the separation behaviour could be deduced from the experiments. 相似文献
16.
An analytical model is developed for the compression of coated substrates in a soft rolling nip formed between a hard roll
and a soft covered roll. The coating layer, substrate, and soft cover are modeled as a stack of three layers that are compressed
jointly while passing through the nip. Material models have been adopted separately for each of the three layers and were
combined together according to the thickness of individual layers. In this study, the substrate is considered to be a viscoelastic–plastic
material and is represented by a modified solid element while the coating layer is assumed to be elastic and the soft cover
material is approximated by a standard Maxwell model. A strain function is derived for the compression of substrate in the
nip that appears to be a parabolic function of time. Substrate compression in the nip and its subsequent relaxation are calculated
by solving a set of differential equations that describe the coating, substrate, and soft cover deformations. This model is
used to study the soft-nip calendering of coated papers. Examples of numerical modeling that demonstrate the paper deformation
and stress profiles in the nip are presented. In addition, the effects of paper and cover properties as well as calendering
parameters on the dynamics of paper compression are discussed. Finally, a comparison of the modeling results is made with
the experimental data. 相似文献
17.
破碎、粉磨作业设备中,内衬板的选用往往不被重视,一些耐磨性好的材料,因不能适应工况条件而降低了使用寿命。通过调整马氏体钢的成分,经热处理后,进行工况条件的耐磨适应性试验,使马氏体钢的成分和组织在特定工况条件下的耐磨性最优化,可以提高内衬板的使用寿命,降低成本,提高生产效益。 相似文献
18.
《IEEE transactions on magnetics》2005,41(8):2391-2397
High power density applications require special treatment in design optimization. Among the critical questions is how the working torque angle will change through an optimization analysis. We present a new method for computing and using the synchronous reactance that accounts for the torque angle in the midst of complex parameter changes. The challenge is to tally this effect along with the load power factor into a variable metric optimization. Our new technique both computes this reactance under heavy saturation and integrates it into the machine design. The technique also covers appropriate stator current excitation densities in transient and steady-state excitation. 相似文献