主要对青海省破碎砾石的资源特性和加工特性进行了分析,选取头破颚式破碎机、二破圆锥式破碎机、三破冲击式破碎机的砾石加工工艺,对加工后的破碎砾石成品料进行了主要技术指标检测,同时通过室内试验分析了其路用性能的适用性。

The crushed gravel resource properties and processing properties are mainly analyzed in Qinghai province ,and the first broken jaw crusher ,the second broken cone crusher and the third impact crusher are used in gravel processing technology ,then the main technical indicators for crushed gravel finished product after processing are tested .Meanwhile analysis of its road performance adaptability by laboratory tests is finished .

对颚式破碎机进行结构和运动分析,建立简单的虚拟样机模型,通过ADAMS对模型中的连杆和摇杆在一个运动周期中角速度和角加速度之间的变化关系和变化范围进行仿真分析。分析结果显示了二者的变化过程、范围和关系。该研究结果对破碎机的优化设计有一定的参考价值和较高的使用价值。

The structure and motion analysis was carried out on the jaw crusher, build the virtual prototype model of simple, by ADAMS, the model of the connecting rod and a handle in one movement cycle angular velocity and angular acceleration and the change of the relationship between range for simulation analysis. Analysis and shows the change of the process, the scope and relationship. The results of optimization design of crusher have a certain reference value, have higher use value.

文章研发了一种矿石破碎系统,包括送料机构和破碎机,其特点在送料机构和破碎机之间设计一个淌筛,其优点是对进入破碎机前的矿石进行筛选,对不需要进行破碎的矿石粉末或符合输送检测要求的矿石颗粒直接输送至下一工序,这样不仅可以有效解决破碎机在工作过程的堵塞问题,延长破碎机的使用寿命,而且大大提高了工作效率。

This paper developed an ore crushing system including feeding mechanism and crushers, which feature is a drip sieve which set up between feeding mechanism and crushers. The advantage is to pre-screening the ore before entering the crusher. When the ore is no need to be broken or to meet the testing requirements ,it can be directly to the next step. So it is not only can effectively solve Crusher blockage when it is at work,and extend the life of the crusher, but also improve the working efficiency.

颗粒破碎是影响砂土宏-微观力学性质的重要因素。采用改进型的可破碎颗粒生成方法,通过设置不同强度的平行黏结键模拟不同强度的可破碎颗粒,并借用基于离散元方法(DEM)的双轴压缩试验详细研究了可破碎性土在剪切过程中颗粒破碎率/平均破碎程度、微观尺度上的能量耗散分配机制、剪切破碎带形成以及断裂键各向异性的演化过程。结果表明,颗粒破碎强烈地影响砂土在宏观尺度上的力学响应、颗粒尺度上的能量分配机制以及剪切过程中的颗粒的组织结构演化。颗粒破碎主要影响小应变阶段各能量耗散元的分配机制,而在临界状态下剪切带内的颗粒摩擦以及破碎耗能是消耗外界功的主要因素。数值结果亦表明,颗粒的破碎伴随着整个剪切过程,但破碎率的增长速度却随着剪切应变的发展逐渐降低。另外,在剪切过程中,对于低破碎性土,在临界状态下剪切破碎带基本形成,带内的原有组织结构被打乱,断裂键的各向异性也随之弱化。

Detailed knowledge of crushability evolution and particle-scale energy allocation behavior under the influence of particle breakage is of fundamental importance to the development of micromechanics-based constitutive models of sands. This study reports original results of the particle development, energy input/dissipation and shear band formation of idealized crushable sands using 2D discrete elements simulations. Particle breakage is modeled as the disintegration of synthetic agglomerate particles which are made up of parallel-bonded elementary discs. Simulation results show that the particle crushability strongly affect the mechanical response in macroscopic level and energy allocation in particle-scale level of the soil both at small and large strains. The major role of particle breakage, which itself only dissipates a negligible amount of input energy, is found to advance the soil fabric change and promote the inter-particle friction dissipation. At large strains where particle bre

颗粒破碎是自然界中常见的物理现象。高应力水平作用下堆石坝料会发生严重的颗粒破碎。基于热力学和微极理论，建立了考虑颗粒破碎的微观力学模型。为了模拟颗粒体的破碎过程和侧向应力的影响，把胶结在一起的3个等粒径的颗粒体当作颗粒破碎体。通过引入颗粒破碎准则，并采用均匀化理论，建立了颗粒尺度的应力–应变关系，并模拟了加载过程中颗粒破碎发生时的应力和应变。计算结果表明所提出的微观力学模型可以模拟颗粒破碎前的应力逐渐增大和破碎时的应力跌落现象。

Grain breakage is a common physical phenomenon in nature. Rockfill materials may break up seriously upon high stress level of loading. Based on the thermomechanics and micropolar theory, a micromechanical model for granular matter is formulated considering the grain breakage. Three grains with the same radius bonded together are taken as an assembly of crushing grain to simulate the grain breaking process with the influence of lateral stress. By introducing the grain breakage criterion and using the homogenization theory, the stress-strain relationship in particle scale is established, and the stress and strain are modeled with breakage occurring in the process of loading. The computed results demonstrate that the proposed micromechanical model can simulate the increase of stress before grain breakage and stress dropping at occurrence of grain breakage.