链斗式堆高机螺旋转料过程的研究
发布时间：2018-07-30 08:38
【摘要】：港口堆场用于储存和转运货物,对港口的发展具有重大意义。港口一般采用斗轮堆取料机、斗式提升机和桥式堆料机等作为堆取物料的设备,但它们适用于专业化大型堆场,体积庞大、价格高昂。对于多货种、多货主采用自卸车工艺系统的中小型堆场的堆料作业,一种新型的堆取物料机械——链斗式堆高机应运而生。链斗式堆高机结合斗式提升机、螺旋输送机和皮带输送机的输送特点,能够实现物料的垂直提升、水平转料、倾斜提升三级输送,同时安装有轮胎行走机构和俯仰机构,可以在堆场任意位置工作,实现不同高度的物料堆积作业,大大提高对货种与自卸车卸料的利用率。对链斗式堆高机而言,螺旋转料结构的作用是将链斗卸载的物料转运到悬臂皮带上,它的转料效率对整机的堆高性能有重要的影响。因此,有必要对影响转料输送量的螺旋结构、充填率、转速和螺距进行深入的分析研究,同时利用EDEM仿真软件对这些影响因素进行仿真验证。本文以链斗式堆高机的螺旋转料过程为研究对象,利用散货力学知识,以EDEM仿真软件为工具,对螺旋转料过程中物料输送特性展开了分析研究:分析散粒物料的力学性质、平面应力状态,以及输送过程中散粒体的形状和强度及形成过程对料槽器壁的应力影响;分析螺旋转料结构特性,引进刚度理论对螺旋轴的弯曲变形情况进行研究;利用单质点法分析转料机理的动力学和运动学特性,并根据推导的公式得到物料的轴向分速度和径向分速度随径向距离变化的曲线图;引进轴向速度修正系数k*,建立k*与充填率的数学模型,并对输送量的计算公式进行修正;建立充填率、转速、螺距影响输送量的数学模型,并在EDEM中仿真论证了影响转料输送量的理论的正确性,依据仿真数据确定了一组具有最理想输送效果的参数。
[Abstract]:The port yard is used to store and transfer cargo, which is of great significance to the development of port. The port generally uses bucket wheel stacker, bucket hoist and bridge stacker as the equipment for stowage, but they are suitable for large specialized yard, which are huge in volume and high in price. For the multi-cargo, the multi-cargo truck technology system used in the small and medium-sized yard stowage operations, a new type of stowage machinery-chain bucket heap-dump machine came into being at the historic moment. With the characteristics of bucket hoist, screw conveyer and belt conveyor, the chain bucket heap-hoist can realize the three-stage conveying of material vertically, horizontally, and tilted. At the same time, it is equipped with tire walking mechanism and pitching mechanism. It can work in any position in the yard, realize the material stacking operation with different height, and greatly improve the utilization ratio of cargo type and dump truck. For the chain bucket type heapper, the function of the screw transfer structure is to transfer the unloading material of the chain hopper to the cantilever belt, and its transfer efficiency has an important effect on the heaping performance of the whole machine. Therefore, it is necessary to analyze and study the screw structure, filling rate, rotational speed and pitch which affect the volume of the conveyer. At the same time, the influence factors are verified by EDEM simulation software. Based on the knowledge of bulk mechanics and EDEM simulation software, this paper analyzes and studies the characteristics of material conveying in the process of chain bucket crane, and analyzes the mechanical properties of bulk materials. The plane stress state, as well as the shape and strength of the bulk and the influence of the forming process on the stress of the groove wall, are analyzed, and the bending deformation of the spiral shaft is studied by introducing the stiffness theory. The kinetic and kinematic characteristics of the rotating mechanism are analyzed by means of the simple point method, and the curves of the axial and radial fractional velocities with the radial distance are obtained according to the derived formulas. This paper introduces the axial velocity correction coefficient KG, establishes the mathematical model of k* and filling rate, and modifies the calculation formula of conveyer quantity, establishes the mathematical model of filling rate, rotational speed and pitch affecting the conveyer quantity, The correctness of the theory affecting the transfer rate is demonstrated by simulation in EDEM. According to the simulation data, a set of parameters with the most ideal conveying effect is determined.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U653.928.5
本文编号：2154437
[Abstract]:The port yard is used to store and transfer cargo, which is of great significance to the development of port. The port generally uses bucket wheel stacker, bucket hoist and bridge stacker as the equipment for stowage, but they are suitable for large specialized yard, which are huge in volume and high in price. For the multi-cargo, the multi-cargo truck technology system used in the small and medium-sized yard stowage operations, a new type of stowage machinery-chain bucket heap-dump machine came into being at the historic moment. With the characteristics of bucket hoist, screw conveyer and belt conveyor, the chain bucket heap-hoist can realize the three-stage conveying of material vertically, horizontally, and tilted. At the same time, it is equipped with tire walking mechanism and pitching mechanism. It can work in any position in the yard, realize the material stacking operation with different height, and greatly improve the utilization ratio of cargo type and dump truck. For the chain bucket type heapper, the function of the screw transfer structure is to transfer the unloading material of the chain hopper to the cantilever belt, and its transfer efficiency has an important effect on the heaping performance of the whole machine. Therefore, it is necessary to analyze and study the screw structure, filling rate, rotational speed and pitch which affect the volume of the conveyer. At the same time, the influence factors are verified by EDEM simulation software. Based on the knowledge of bulk mechanics and EDEM simulation software, this paper analyzes and studies the characteristics of material conveying in the process of chain bucket crane, and analyzes the mechanical properties of bulk materials. The plane stress state, as well as the shape and strength of the bulk and the influence of the forming process on the stress of the groove wall, are analyzed, and the bending deformation of the spiral shaft is studied by introducing the stiffness theory. The kinetic and kinematic characteristics of the rotating mechanism are analyzed by means of the simple point method, and the curves of the axial and radial fractional velocities with the radial distance are obtained according to the derived formulas. This paper introduces the axial velocity correction coefficient KG, establishes the mathematical model of k* and filling rate, and modifies the calculation formula of conveyer quantity, establishes the mathematical model of filling rate, rotational speed and pitch affecting the conveyer quantity, The correctness of the theory affecting the transfer rate is demonstrated by simulation in EDEM. According to the simulation data, a set of parameters with the most ideal conveying effect is determined.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U653.928.5
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