基于粘性离合器的可控启动传输系统（CST）启动特性的研究

发布时间：2018-06-18 17:18

  本文选题：CST + 粘性离合器　； 参考：《太原理工大学》2011年硕士论文

【摘要】：大型带式输送机在启动过程中需要进行调速控制,本文所研究的可控启动传输系统是基于牛顿内摩擦定理,利用粘性剪切力来传递动力,具有传递效率高、易于控制、过载保护等功能。但是目前在我国,这项技术仅在水泵类负载以及风机中应用比较广泛,而针对其在带式输送机中的研究还处于相对落后的阶段。 本文以道奇公司生产的CST系统为研究对象,通过对其机械部分、压力回路以及控制方法的理论分析,结合软件仿真和实验,同时对比国内产品,提出相应的改进措施,提高了系统的控制精度和响应速度,使得系统能够很好满足机械设备的可控启动、调速等各种工况的控制要求。整个带式输送机压力控制系统采用电液比例控制系统,电液比例阀具有较高的控制精度和稳定性,对环境要求不高,比伺服阀更适应于实际工程；电气控制部分则主要是采用闭环PID控制(包括对压力、速度、加速度和功率的PID控制),其中主要的控制参数为皮带速度和电机功率,保证系统带速在理想启动的前提下各个电机输出功率平衡；整个控制网络是基于PROFIBUS-DP的网络配置方式,使用PLC对各模拟量、数字量进行控制,监控输送带的启动方式,并在系统过载、过热或胶带打滑时发出警报。 本文重点分析了系统在小流量时的压力控制方式,针对目前大多数产品使用比例溢流阀控制不理想的情况,提出了用三通电液比例减压阀进行改善的措施。论文中,首先在SimulationⅩ中对阀进行建模仿真比较,然后提出使用PID闭环控制可以优化阀的压力控制性能,并在此基础上设计了三通比例减压阀的控制实验,模拟输送机启动过程,实施压力PID控制,验证了理论和仿真分析的结果。 本文设计的带式输送机可控启动装置集机、电、液于一体,控制效果更好,延长了传送带的使用寿命、提高了设备的安全系数和生产效率。
[Abstract]:Large belt conveyors need speed regulation control in the starting process. The controllable start transmission system studied in this paper is based on Newton's internal friction theorem, which uses viscous shear force to transfer power, which has high transfer efficiency and is easy to control. Overload protection and other functions. However, at present, this technology is only widely used in pump load and fan, but the research on it in belt conveyor is still relatively backward. This paper takes the CST system produced by Dodge Company as the research object, through the theoretical analysis of the mechanical part, pressure loop and control method, combined with the software simulation and experiment, at the same time, puts forward the corresponding improvement measures to the domestic products. The control precision and response speed of the system are improved so that the system can meet the control requirements of various working conditions such as controllable start and speed regulation of machinery and equipment. The whole pressure control system of belt conveyer adopts electro-hydraulic proportional control system. The electro-hydraulic proportional valve has higher control precision and stability, and has less requirement to environment, so it is more suitable for practical engineering than servo valve. The electrical control part mainly adopts the closed loop pid control (including pid control for pressure, speed, acceleration and power), in which the main control parameters are belt speed and motor power. The whole control network is based on PROFIBUS-DP network configuration mode, using PLC to control the analog quantity and digital quantity, monitor the starting mode of conveyer belt, ensure that the system speed is balanced under the premise of ideal start, and the whole control network is based on PROFIBUS-DP network configuration mode. The alarm is issued when the system is overloaded, overheated or the tape slips. In this paper, the pressure control mode of the system at small flow rate is analyzed. In view of the unsatisfactory control of proportional relief valve used in most products at present, the improvement measures with three-way electro-hydraulic proportional pressure reducing valve are put forward. In this paper, the valve is first modeled and simulated in Simulation 鈪，

本文编号：2036272