链斗式堆高机链斗卸料过程的研究及仿真

发布时间：2019-01-21 13:14

【摘要】：堆场是港口码头的重要组成部分,是港口物料的周转场所。堆存量和周转效率是堆场的两个重要指标,堆存量的大小和周转的快慢直接影堆场效率,进而影响港口效益。散料堆取料机是堆场堆取料的重要设备,现在港口应用较多的机型是斗轮堆取料机、斗式提升机和桥式堆料机等。武汉理工大学学者提出一种新机型——链斗式堆高机,适用于自卸车的散货装卸工艺系统,可取代目前的装载机等堆高设备,具有堆高效率高、动作灵活、能耗低。环境污染小等特点。链斗式堆高机结合了链斗式提升机、螺旋输送机和皮带输送机三种机型输送特点,物料通过垂直提升、水平转料、倾斜提升三级输送而被堆存到一定高度。链斗式堆高机采用轮胎式行走机构,可以在堆场任意位置作业,由于连续取料、提升、堆料,堆高效率大为提高;同时因采用了垂直输送结构,使料堆高度增大,从而增加了堆场的堆存量,提高了堆场利用率。本文主要研究链斗式堆高机垂直输送物料过程中链斗卸料物料的运动特性。先从散体力学方面分析颗粒的应力状态、颗粒平衡条件以及颗粒在倾斜料槽中的运动状态,推导出颗粒发生滑动时料槽的最小倾斜角。分析在旋转过程卸料方式,斗内物料在提升、旋转和倾斜下降过程中斗内物料的滑移面变化,以及颗粒在三阶段的受力分析,建立颗粒受力平衡方程式,推导出斗内颗粒的运动微分方程。根据颗粒的运动微分方程式求出颗粒卸出的初始速度,建立颗粒做抛物运动的运动方程。确定链斗旋转过程的初始卸料角,求出几种典型颗粒的位置,然后根据颗粒卸出后的运动方程式绘制出典型颗粒的运动轨迹线,得出整个物料流的轮廓线,根据物料流的轮廓线可以设计链斗罩壳。通过分析最晚卸出颗粒轨迹,验证链斗卸料是否完全。最后,通过EDEM离散元软件进行仿真,模拟链斗整个卸料过程并提取结果分析;设置不同的链条牵引速度、链条倾斜角、链斗间距等参数进行仿真,得出一组卸料效果最好的参数。
[Abstract]:The yard is an important part of the port wharf and the turnover place of the port material. The storage and turnover efficiency are two important indexes of the yard. The size of the storage and the speed of turnover directly affect the efficiency of the yard, and then affect the efficiency of the port. Bulk stacker is an important equipment for stowage in the yard. Nowadays, the most widely used models in port are bucket wheel stacker, bucket hoist and bridge stacker, etc. The scholars of Wuhan University of Science and Technology have proposed a new type, the chain bucket type heap-heapper, which is suitable for the bulk loading and unloading process system of the dump truck. It can replace the current stowage equipment such as the loader, which has the advantages of high efficiency, flexible action and low energy consumption. Small environmental pollution and other characteristics. Chain bucket hoist combines three types of conveying characteristics: chain bucket hoist, screw conveyor and belt conveyor. The material is stored to a certain height through vertical lifting, horizontal material transfer and inclined lifting. The chain bucket type pile crane adopts the tyre type walking mechanism, can work in any position of the yard, because of the continuous collection, the lifting, the stacking material, the heap high efficiency greatly enhances; At the same time, the vertical conveying structure is used to increase the height of the pile, thus increasing the storage of the yard and increasing the utilization ratio of the yard. This paper mainly studies the movement characteristics of the chain bucket unloading material in the vertical conveying process of the chain bucket crane. The stress state of particles, the condition of particle equilibrium and the movement state of particles in tilted tank are analyzed from the aspect of particle mechanics, and the minimum inclined angle of the tank is deduced when particles slide. This paper analyzes the unloading mode in the process of rotation, the slip surface change of the material in the bucket during lifting, rotating and sloping down, and the stress analysis of the particles in the three stages, and establishes the equation of force balance of the particles. The differential equations of motion of particles in a bucket are derived. According to the equation of motion differential equation of particle, the initial velocity of particle unloading is obtained, and the equation of motion of particle acting as parabolic motion is established. The initial unloading angle of the chain bucket rotation process is determined and the positions of several typical particles are obtained. Then the trajectory of the typical particles is drawn according to the motion equation after the particles are unloaded, and the contours of the whole material flow are obtained. According to the outline of the material flow, the chain bucket housing can be designed. By analyzing the path of unloading particles at the latest, it is verified that the discharge of the chain hopper is complete. Finally, the whole unloading process of the chain hopper is simulated by EDEM discrete element software and the result is analyzed. The parameters such as different chain traction speed, chain inclination angle and chain bucket spacing are simulated, and a group of parameters with the best unloading effect is obtained.
【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

【参考文献】