双轮铣槽机铣槽装置电驱动与液压驱动比较研究

发布时间：2018-04-04 03:39

本文选题：双轮铣槽机铣槽装置　切入点：电驱动　出处：《长安大学》2017年硕士论文

【摘要】：液压双轮铣槽机正逐步替代液压抓斗和旋挖钻机施工地下连续墙以满足严苛的防渗要求和施工工艺要求,成为品质连续墙施工的主要装备。但当施工深度大于40m时,绞盘上缠绕很长的液压软管造成很大的功率损失并产生大量的热,让机器处在高耗低效的状态。另外软管散热性能差,热平衡的温度会升高,将带来一系列危害。据此我们研究通过绞盘收放电缆的电驱双轮铣槽机。本文完成了双轮铣槽机铣槽装置电驱动与液压驱动的比较研究。首先,参考中型液压双轮铣槽机参数完成驱动电机选型计算,由于电机的机械特性软,确定采用双电机并联驱动的方案;同时根据各频率下电机机械特性确定变速范围,再通过输出与输入扭矩比值和速度比值计算传动比;其次,通过比较确定转差频率矢量控制的方法,并在MATLAB/Simulink中建立电驱系统的模型,同时在AMEsim中建立液压驱动系统的模型;最后,完成铣槽装置电驱动和液压驱动比较研究,主要比较两者调速特性、稳定性、抗载能力、效率、极限负载下系统响应。依据理论和仿真的结果得到:为保证良好的输出力矩确定双电机并联的驱动方案;根据各频率下电机机械特性确定变速范围;根据驱动负载的特性确定转差频率矢量控制的方法;铣槽装置电驱系统的抗载能力和调速范围都小于液压驱动系统;恒负载工况下,铣槽装置电驱系统和液压驱动系统都可以实现平滑调速;变负载工况下,这两种驱动系统都具有很好的稳定性,可以保持恒速工作;极限负载工况下,电驱系统的速度波动小于液压驱动系统,并且很快的恢复稳定;电驱系统在经济区工作时效率大于液压驱动系统效率。
[Abstract]:Hydraulic double-wheel milling machine is gradually replacing the hydraulic grab and rotary drilling machine to construct underground continuous wall to meet the strict requirements of impermeability and construction technology and become the main equipment of quality continuous wall construction.However, when the construction depth is more than 40 m, the winding of a very long hydraulic hose on the winch causes a great loss of power and a large amount of heat, which makes the machine in a state of high consumption and low efficiency.In addition, the thermal performance of the hose poor, heat balance temperature will rise, will bring a series of hazards.Based on this, we study the electric drive double-wheel slot milling machine through winch cable.In this paper, the comparative study of electric drive and hydraulic drive of double wheel slot milling machine is completed.First of all, referring to the parameters of the medium hydraulic double wheel milling machine, the selection calculation of the drive motor is completed. Because of the soft mechanical characteristics of the motor, the parallel drive scheme of the double motor is determined. At the same time, according to the mechanical characteristics of the motor under each frequency, the range of speed change is determined.Then the transmission ratio is calculated by the ratio of output to input torque and speed. Secondly, the method of frequency vector control of slip frequency is determined by comparison, and the model of electric drive system is established in MATLAB/Simulink, and the model of hydraulic drive system is established in AMEsim.Finally, the comparative study of electric drive and hydraulic drive of milling slot device is completed. The characteristics of speed regulation, stability, load resistance, efficiency and system response under limited load are compared.According to the theoretical and simulation results, the following conclusions are obtained: to ensure good output torque, to determine the parallel drive scheme of the two motors, to determine the range of speed change according to the mechanical characteristics of the motor at various frequencies;According to the characteristics of driving load, the method of frequency vector control of slip frequency is determined; the anti-load ability and speed range of electric drive system of milling slot device are smaller than that of hydraulic drive system; under constant load condition, the load resistance of electric drive system is lower than that of hydraulic drive system.Both electric drive system and hydraulic drive system of milling slot device can achieve smooth speed regulation; under variable load condition, both of these two drive systems have good stability and can keep constant speed operation; under the limit load condition,The speed fluctuation of the electric drive system is smaller than that of the hydraulic drive system, and the stability of the electric drive system is quickly restored, and the efficiency of the electric drive system is greater than that of the hydraulic drive system when it works in the economic zone.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG54

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