电铲拖动系统设计

发布时间：2018-04-03 16:16

本文选题：变频器　切入点：ACS　出处：《南昌大学》2015年硕士论文

【摘要】：电铲是露天矿山主流程设备之一。它与矿用运输车协同作业铲装矿石和废石。电铲的工作环境比较恶劣,尤其在有爆破根底或大块矿石的场合,电铲会受到很大的冲击负荷。因此,要求电铲的拖动系统不但要能控制电机四象限运行,还要求能够快速控制电机正反转。此外对系统的可靠性和维修的便利性也有较高要求。早期的电铲是通过高压电动机带动发电机组来运转的。因使用自流电动机导致设备笨重,而且对电机缺乏有效的保护、在爆破条件不好或夏天高温环境下,烧毁电机或因电机控制欠佳导致的机械故障时有发生,给企业生产造成一定影响。近年来,随着电气传动与自动化技术的迅速发展,交流变频调速技术在重型矿山机械设备上的应用越来越普及。它在调速和控制性能、电机保护及节能等方面的优势已得到充分的验证。本文根据电铲的工作特性,设计了一种四立方米电铲变频调速系统。该系统在实际生产中的电铲上得到良好的应用效果,为矿山电铲的调速技改提供了有益参考。本文在介绍电铲工作过程及调控要求的基础上,提出采用PLC、变频器、PROFIBUS和辅助电气控制系统构成变频调速控制系统。PLC作为主控制器,通过PROFIBUS向变频器及电机构成的各子系统下达调控命令来实现电铲的各种动作,并通过相应措施来提高系统的抗干扰能力,经实际使用验证达到预期的控制效果。
[Abstract]:The electric shovel is one of the main equipment in the open pit mine.It works with a mine transport truck to shovel ore and waste rock.The working environment of the electric shovel is very bad, especially in the case of blasting bottom or large ore, the electric shovel will be subjected to a great impact load.Therefore, the drive system of the shovel should not only control the motor operation in four quadrants, but also quickly control the forward and backward rotation of the motor.In addition, the reliability of the system and the convenience of maintenance also have higher requirements.Early shovels were operated by high-voltage motors driving generators.Because of the heavy equipment caused by the use of the self-flowing motor and the lack of effective protection for the motor, the mechanical failure caused by the burning of the motor or the poor control of the motor occurs from time to time under the bad blasting conditions or the high temperature environment in summer.To the enterprise production has a certain impact.In recent years, with the rapid development of electrical transmission and automation technology, the application of AC frequency conversion speed regulation technology in heavy mining machinery equipment is becoming more and more popular.Its advantages in speed regulation and control performance, motor protection and energy saving have been fully verified.According to the working characteristics of electric shovel, a four cubic meter variable frequency speed regulating system is designed in this paper.The system has a good application effect on the actual production of electric shovel and provides a useful reference for the technical reform of mine electric shovel speed regulation.On the basis of introducing the working process and control requirements of electric shovel, this paper puts forward that PLC, PROFIBUS and auxiliary electric control system are adopted as the main controller of variable frequency speed regulation control system.The various actions of the shovel are realized by PROFIBUS to the subsystems of frequency converter and motor, and the anti-interference ability of the system is improved by the corresponding measures, and the expected control effect is verified by practical use.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD422.21

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