带式输送机永磁变频自动张紧装置的研究

发布时间：2018-05-26 09:42

  本文选题：带式输送机 + 张紧装置　； 参考：《太原理工大学》2017年硕士论文

【摘要】：矿用带式输送机是煤矿综采装备的重要组成部分,主要用于散装物料的运输工作,其正常运行是保障综采工作面生产效率的关键。张紧装置为提供输送带正常运行所需张力,是用以保证带式输送机正常运行的必要机构。对大型带式输送机来说,其张紧装置动态特性直接影响着带式输送机的工作性能。因此,对于张紧装置的研究具有非常重要的意义。随着带式输送机的发展,张紧装置动态特性对其性能的影响越来越大。由于输送带具有蠕变特性,使其在运行过程中会因变长而松弛,系统各部分均表现出较强的非线性和时变性,要求张紧装置输出张力必须实现连续控制以适应负载的动态变化。以DSJ160/350/3×500型可伸缩带式输送机为例,依据“逐点张力法”,对该带式输送机不同工况正常运行过程中所需张力条件进行计算分析。提出一种新型张紧装置设计方案,即永磁变频自动张紧装置,并完成了该系统的设计。新型永磁变频自动张紧装置是以永磁同步电机和变频器作为主要驱动机构的张紧系统,大大简化了机械结构,并从根本上解决了液压张紧装置故障率高、响应速度慢等问题。利用AMESim和Matlab软件,建立带式输送机和永磁变频自动张紧装置的仿真模型,联合仿真进行动力学仿真实验,并对仿真结果进行分析。在带式输送机满载运行的工况中,通过分析游动小车以及输送带关键点的位移曲线、速度曲线、张力曲线,分析可得:满载运行的工况下,带式输送机启动59s时,速度传到机尾,机尾加速度大于机头加速度,容易产生震荡;满速运行时,机头张力约为机尾张力的4倍,机头驱动滚筒、机架、卸料滚筒等相比机尾机构更容易损坏;机尾410s开始移动,游动小车413s开始动作,张紧装置的调节对于输送带张力变化有一定的滞后,滞后时间为3s;永磁变频自动张紧装置能够对输送带张力进行实时的调节,满足运行时输送带对张力的需求。对应用永磁变频张紧装置的不同带式输送机的动态性能进行对比仿真实验,实验结果表明:满载工况相比空载工况而言,张紧装置需输出更大的功率,此外,驱动滚筒紧边张力要大得多;输送带弹性模量越小,游动小车移动速度的峰值越大,达到峰值所需的时间越长,小车的位移越长,弹性波在输送带中传播的速度越小;输送带流变系数影响系统的稳定性,流变系数越大,波动越小。
[Abstract]:Belt conveyor is an important part of fully mechanized coal mining equipment, which is mainly used in bulk material transportation, and its normal operation is the key to ensure the production efficiency of fully mechanized mining face. Tensioning device is necessary to ensure the normal operation of belt conveyor in order to provide the tension required for normal operation of conveyor belt. For large belt conveyor, the dynamic characteristics of its tensioning device directly affect the working performance of belt conveyor. Therefore, it is of great significance to study the tensioning device. With the development of belt conveyor, the dynamic characteristics of tensioning device have more and more influence on its performance. Because of the creep property of the conveyor belt, it will be relaxed in the process of running, and all parts of the system show strong nonlinearity and time-varying. It is required that the tension output of the tensioning device must be controlled continuously to adapt to the dynamic change of the load. Taking DSJ160/350/3 脳 500-type retractable belt conveyor as an example, according to "point-to-point tension method", the tension conditions required in the normal operation of the belt conveyor under different working conditions are calculated and analyzed. A new type of tensioning device, permanent magnet frequency conversion automatic tensioning device, is proposed, and the design of the system is completed. The new type of permanent magnet frequency conversion automatic tensioning device is a tension system with permanent magnet synchronous motor and frequency converter as the main driving mechanism, which greatly simplifies the mechanical structure and fundamentally solves the problems of high failure rate and slow response speed of hydraulic tensioning device. Using AMESim and Matlab software, the simulation model of belt conveyor and permanent magnet frequency conversion automatic tensioning device is established, and the dynamic simulation experiment is carried out jointly, and the simulation results are analyzed. In the condition of full load running of belt conveyor, by analyzing the displacement curve, velocity curve and tension curve of the key points of the moving trolley and the conveyor belt, we can get: under the condition of full load operation, the belt conveyor starts for 59s. Speed to the tail, the tail acceleration is greater than the nose acceleration, easy to produce shock; full speed operation, the nose tension is about 4 times of the tail tension, the nose drive drum, frame, discharge drum and so on are more easily damaged than the tail mechanism; The rear 410s begin to move, the swimming trolley 413s begin to move, the adjustment of the tensioning device has a certain lag to the change of the belt tension, the lag time is 3s; the permanent magnet frequency conversion automatic tensioning device can adjust the belt tension in real time. To meet the operational requirements of the conveyor belt tension. The dynamic performances of different belt conveyors with permanent magnet frequency conversion tensioning device are compared and simulated. The experimental results show that the tensioning device needs more power output than the no-load condition under the full load condition. The smaller the elastic modulus of the conveyor belt, the greater the peak value of the moving speed, the longer the time required to reach the peak value, the longer the displacement of the vehicle and the smaller the velocity of elastic wave propagating in the conveyor belt. Conveyor belt rheological coefficient affects the stability of the system, the larger the rheological coefficient, the smaller the fluctuation.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD634.1

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