履带起重机起升机构闭式液压控制系统研究

发布时间：2018-02-04 19:51

本文关键词： 闭式液压系统起重机二次起升动态特性模糊控制　出处：《大连理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：履带起重机起升机构作为履带起重机的重要机构之一,其动态特性会直接影响整机的起重性能。而目前,国内起重机起升机构多采用开式液压系统,国外已实现了全闭式液压系统。与开式液压系统相比,闭式液压系统的特点是：大多是单泵单马达系统,且机构动作不相互影响；传动平稳,液压冲击和能量损失小；全电控可实现二次起升防回跌功能；管路连接少,且布置方便；油路简单,阀块少,出现故障的几率低；电控系统设计的可靠性对于安全至关重要。因此,通过建立闭式系统电液控制平台对其进行仿真研究,解决电控系统设计技术难点,对闭式液压系统在履带起重机起升机构上的广泛应用具有较大的工程实用意义。本文以本课题组的预研项目闭式系统电液控制平台为背景,对闭式液压系统起升机构的防二次回跌现象的电控技术进行研究。 (1)在研究了闭式液压系统原理及其特点的基础上,提出了综合考虑控制手柄、压力记忆和制动器开启时间等因素的二次起升控制原理。 (2)完成了闭式系统电液控制平台的液压和电气原理设计,并依据计算结果对闭式系统电液控制平台进行了元件选型和三维建模。 (3)推导了闭式液压系统高压腔的压力随时间的变化方程,输出了负载与推手柄时间关系曲线及负载与制动器开启时刻变化曲线。 (4)建立了控制手柄到马达转速的仿真系统模型,通过MATLAB仿真结果验证了该控制方法的有效性。 (5)基于闭式系统电液控制平台,应用模糊控制算法,通过CoDeSys软件平台对控制器进行二次起升控制系统编程。
[Abstract]:Crawler crane lifting mechanism is one of the most important institutions of crawler cranes, its dynamic characteristics will directly affect the lifting performance of the whole machine. However, at present, the domestic hoisting mechanism of cranes mostly adopts the open hydraulic system, and the fully closed hydraulic system has been implemented abroad.
Compared with the open hydraulic system, the characteristics of the closed hydraulic system is mostly single pump single motor system, and the mechanism of action does not influence each other; smooth transmission, hydraulic shock and low energy loss; full electronic control can achieve two times of hoisting anti down function; less pipeline connection, and the arrangement is convenient; the oil valve simple. A small, low failure probability; reliability design of electronic control system for safety is very important. Therefore, through the establishment of the closed hydraulic control system simulation research on the technology of electronic control system is designed to solve the difficulties, to the closed hydraulic system is widely used in lifting mechanism on the crawler crane has a great practical significance.
The closed system of electro-hydraulic control platform under the background of the research project the research group, research on electronic control technology of closed hydraulic system of the hoisting mechanism of the prevention of two fall phenomenon.
(1) on the basis of studying the principles and characteristics of closed hydraulic system, a two lifting control principle considering factors such as control handle, pressure memory and brake opening time is put forward.
(2) completed the hydraulic and electrical principle design of the closed system electro-hydraulic control platform, and based on the calculation results, the component selection and three-dimensional modeling of the closed system electro-hydraulic control platform were carried out.
(3) the pressure variation equation of the high pressure chamber of the closed hydraulic system with time is derived, and the relation curve between load and pushing handle time and the change curve of load and brake opening time are output.
(4) the simulation system model of the control handle to the motor speed is established, and the effectiveness of the control method is verified by the MATLAB simulation results.
(5) based on the closed system electro-hydraulic control platform, the fuzzy control algorithm is applied to the control system of the controller through the CoDeSys software platform for two hoisting control system programming.

【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH213.7

【引证文献】