随着带式输送机向高速、长距离、大运量和大功率方向发展，带式输送机系统的动态特性对带式输送机运行的影响日益突出，不容忽视，而拉紧装置是带式输送机不可缺少的重要组成部分，它直接关系到带式输送机的安全运行及使用寿命。因此，研究带式输送机拉紧装置的特性，对于大运量、长距离大型带式输送机的正常运行显得非常重要，对开发新型的带式输送机拉紧装置也是非常必要的。 本文分析了传统的带式输送机拉紧装置的工作方式、结构原理、优缺点。基于拉紧装置的设计要点、设计原则、安装位置，通过方案论证，设计了包括液压系统，电气控制系统和机械系统在内的机电液控制拉紧方案。本方案较好地解决了以往拉紧装置不能实现张力连续控制等弊病，使张力能够及时适应外负载变化，延长了输送带的使用寿命，提高了工作效率。对液压系统和机械系统的主要零部件进行了选型和设计。电气控制中采用PLC控制方式，设计了PLC控制方案，采用S7-PLCSIM对编写的控制程序进行了模拟仿真，为拉紧装置的实际应用奠定了基础。 传统的静态分析方法是在静力学基础上按静止或匀速运行状态对带式输送机系统进行受力分析，致使拉紧装置的动态特性对整个系统的影响被忽略了。故本文采用动态分析方法，针对拉紧装置的物理模型，采用整体模型分析，对各模块建立数学模型，再统一各模块数学模型的方法得到了拉紧装置的数学模型。 使用MATLAB的Simulink仿真软件对带式输送机拉紧装置进行仿真，验证了系统的可行性。该拉紧装置能在停机到起动工况，再由起动工况到稳定工况时，用较短的时间使输送带的张力值从起动值降到正常值，还可以在较短的时间内完成紧带与松带的过程，在输送机起起动到稳定的过程中，保证输送带受到的由冲击引起的振动较小，达到了较好的控制效果。

With the developing of belt conveyor, to the high-speed, long distance, large capacity and high-power, the dynamic characteristics of belt conveyor systems have become increasingly prominent and can not be ignored, and take-up system is an important and indispensable component, which is directly related to the safe operation and belt’s life. Therefore, to study the characteristics of take-up system of belt conveyor is very important for large capacity and long distance belt conveyor to run normally, and it is necessary to exploit a new style belt conveyor take-up system. This paper analyzes some traditional take-up system of belt conveyor, like work mode, structure principle, advantages and disadvantages. Base on the design highlights, design principles, and installation location of take-up system, through scheme argumentation the paper design a control-take-up system, which include the hydraulic system, the electrical control system and mechanical system. This paper better solves the formerly take-up system’s drawbacks, which it can not be achieved in tension control continuously and so on. The new take-up system comes to a better tension control effect under external load, prolongs service life of belt conveyor, and improving work efficiency. The paper also includes selection and design for some main parts of hydraulic system and mechanical system. In the electrical control system, I chose the PLC control program to design the control scheme, and uses the S7-PLCSIM to simulate the control program. It laid the foundation for practical application of tensioning device. Traditional static analysis method is based on static or uniform state to analyze the force of the belt conveyor system, leading that the dynamic nature of tensioning device to the whole system has been neglected. Therefore, this paper takes this dynamic analysis method. Against the physics model of the take-up system, this paper uses the method which analyzes the whole model, and blocks models, then unified the models, to get and analyze the system model. It uses Simulink of MATLAB to simulate the take-up system, validating that the system is feasible. In the time from stop to start, then to run smoothly, the take-up system can drop the belt’s strain from the start date to normal in a short time, it also can finish the process of belt’s take-up and release in a short time. During the conveyor’s process from start to normal, the take-up system ensure that the belt is suffered the fewer vibration which coursed by impulsion, achieving a good control effect.