摘要:本文在参考常规下运带式输送机设计方法的基础上,分析了常见驱动方式和制动方式用于长运距、大运量下运带式输送机上的优缺点,提出该运输机可采用的驱动和制动方式;分析了常见软起动装置及其选型方法,归纳总结出长运距、大运量变坡输送下运带式输送机设计中的关键问题和可靠驱动方案和制动方式优化组合的可行方案;通过常规设计计算,提出了合理确定张紧位置、张紧方式及张紧力大小的方法;对驱动装置及各主要部件进行了选型并校核。
长距离变坡下运带式输送机运行工况复杂,在设计方面需考虑各种可能的工况,并计算最危险工况下输送机的各项参数,同时为保证运行过程中输送机各组成部分能适应载荷及工况的变化需将拉紧力统一,然后重新计算各工况下输送机参数,最终确定整机参数。
本论文对长运距、大运量变坡下运带式输送机,综合考虑各方面的因素,采用合理的驱动方案、制动方式和软启动装置组合,有效保证长运距、大运量变坡下运带式输送机的可靠运行。
关键词:带式输送机 下运 长距离 变坡
STUDY ON COMMON TRANSPORTING BELT-CONVEYER
ABSTRACT: Based on the design method for the conventional Downwards Transporting Belt-Conveyer (DTBC), the common used driving and braking devices were analyzed in the condition of long-distance and heavy-capacity. The driving and braking types were presented for this kind of conveyer. The soft-starting devices and their type-selection were analyzed. The key points were summarized for designing the long-distance, heavy-capacity DTBC used in varying slope environment. The reliable combined scheme of driving and braking units was put forward. The methods for determining the tensioning location, type and the amount of tensioning force based on the results of conventional calculations. The criterion was summarized for selecting driving device and the main components in the conveyer.
Due to the complicated operational condition of long-distance and varying slope DTBC, it is necessary to consider every kind of possible working conditions during its design and calculate the parameters in the most dangerous condition. At the same time, it is necessary to uniform the tensioning force in order to suit the variations of the load and condition. Then the conveyer''s parameters should be re-calculated under various conditions and the parameters should be determined finally.
The research of this paper shows that by using reasonable combination of driving scheme, braking mode and soft-starting device and by determining the schemes for braking and soft-starting from the dynamical analysis and simulation, the reliable operation could be guaranteed for the long-distance, heavy-capacity and varying slope DTBC.
Key word Belt-conveyer, Downwards transportation, long-distance, Varying slope
1 绪论
带式输送机的最新发展方向时一呈现长距离、大运量、高速度、集中控制等特点。与其他运输设备(如机车类)相比,不仅具有长距离、大运量、连续运输的特点,而且运行可靠,易于实现自动化和集中控制,经济效益十分明显。带式输送机也是煤矿最为理想的高效连续运输设备,特别是煤矿高产高效现代化的大型矿井,带式输送机己成为煤炭高效开采机电一体化技术与装备的关键设备。
随着煤矿现代化的发展和需要,我国对大倾角固定带式输送机、高产高效工作面顺槽可伸缩带式输送机及长运距、大运量带式输送机及其关键技术、关键零部件进行了理论研究和产品开发,应用动态分析技术和中间驱动与智能化控制等技术,研制成功了软启动和制动装置以及PLC控制为核心的电控装置,并且井下大功率防爆变频器也已经进入研发、试制阶段。随着高产高效矿井的发展,带式输送机各项技术指标有了很大提高。
本文在对常规下运带式输送机驱动及制动方案的理论研究的基础上,提出长运距、大运量下运带式输送机常见驱动方式和制动方法,通过系统的动态建模计算和仿真分析,将静态设计结论和动态分析结果相结合,指出长运距、大运量下运带式输送机启动、运行和制动过程中存在的问题,并提出可行的控制理论和解决方案。