下运带式输送机制动阻尼托辊的研究

发布时间：2018-03-03 08:14

本文选题：下运带式输送机　切入点：制动阻尼托辊　出处：《太原理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：带式输送机在原煤输送、存储、转运的作业流程中发挥着巨大的作用。已探明我国煤炭储量中，煤的赋存以倾斜和缓倾斜为主。因此，在井下煤炭的开采及运输中不可避免的要用到下运带式输送机。下运带式输送机运行过程中，当物料在重力作用下产生的下滑分力大于其运行阻力时，驱动电机处于发电运行工况，产生的反力矩来与物料的下滑分力相平衡；当下运带式输送机需要停机制动时，电动机失电，产生的反力矩消失，物料在其下滑分力和惯性力共同作用下产生的向下运动规律完全取决于制动系统与输送带、自动张紧系统的动态耦合。由此可见，制动系统便成为该类带式输送机安全运行的关键环节。本文结合下运带式输送机在制动方面目前存在的问题，在综合考虑各种因素的基础上，为了实现输送机的平稳安全制动，，设计了下运带式输送机制动阻尼托辊，用于下运带式输送机的速度控制及停车制动。本文在研究粘弹性带在刚性托辊表面的运动及形变规律的基础上，对输送带压陷阻力进行了分析，并得出了带速及托辊直径等因素对输送带压陷阻力的影响曲线。结合该研究结果，并在分析了输送机现场工况及制动设备设计目标的基础上完成了下运带式输送机制动阻尼托辊的布置方案设计及制动托辊单体结构三维模型。在对输送带与托辊的相互作用进行合理简化的基础上建立了粘弹性带-刚性托辊系统模型，通过workbench动态仿真模块分析了输送带在托辊制动作用力下的应变及形变状态，并运用Response Surface Optimization模块分析了带速、托辊直径、输送带正压力及托辊旋转摩擦系数等因素对输送带最大应变及形变的影响灵敏度。通过优化分析，得出最大应变时托辊直径及托辊轴与托辊摩擦系数的合理范围。运用RecurDyn多体动力学软件创建了下运带式输送机虚拟样机模型，并根据此虚拟样机分别对传统制动方式和制动托辊制动两种制动方式进行制动效能和输送带张力的仿真对比研究，结合仿真分析结果及张力理论计算研究，得出制动托辊布置的最优方案。
[Abstract]:Belt conveyors play an important role in the operation flow of raw coal transportation, storage and transportation. It has been proved that in China's coal reserves, the occurrence of coal is mainly inclined and gently inclined. In the mining and transportation of underground coal, it is inevitable to use the downward belt conveyor. During the operation of the down-hauling belt conveyor, when the sliding force produced by the material under the action of gravity is greater than its running resistance, The driving motor is in the working condition of power generation, and the reverse torque produced is balanced with the sliding force of the material. When the current belt conveyor needs to stop and brake, the motor loses power and the reverse torque disappears. The downward motion of the material under the combined action of its sliding force and inertial force depends entirely on the dynamic coupling of the braking system with the conveyor belt and the automatic tensioning system. The braking system has become the key link in the safe operation of this kind of belt conveyors. In this paper, combined with the problems existing in the braking of the lower belt conveyors, and on the basis of comprehensive consideration of various factors, in order to realize the smooth and safe braking of the conveyors, The brake damping roller of belt conveyor is designed, which is used for speed control and stop braking of down belt conveyor. Based on the study of the motion and deformation of viscoelastic belt on the surface of rigid roller, the pressure and subsidence resistance of conveyer belt is analyzed in this paper. The influence curves of belt speed and roller diameter on the pressure drop resistance of conveyor belt are obtained. The layout scheme of brake damping roller and the three dimensional model of single structure of brake roller are completed on the basis of analyzing the working condition of conveyer and the design target of brake equipment. On the basis of reasonable simplification of the interaction, a model of viscoelastic belt rigid roller system is established. The strain and deformation state of conveyor belt under brake force is analyzed by workbench dynamic simulation module, and the speed and diameter of roller are analyzed by Response Surface Optimization module. The influence of positive pressure of conveyor belt and friction coefficient of roller rotation on the sensitivity of maximum strain and deformation of conveyer belt is studied. Through optimization analysis, the reasonable range of roller diameter and friction coefficient between roller shaft and roller is obtained. The virtual prototype model of down-moving belt conveyor is established by using RecurDyn multi-body dynamics software. According to the virtual prototype, the braking efficiency and belt tension of the traditional braking mode and the brake roller braking mode are compared, and the simulation analysis results and the tension theory calculation are combined. The optimal scheme of brake roller arrangement is obtained.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD528.1

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