【摘要】：隨著工程施工機械化程度的不斷提高，作為土石方作業(yè)的主要機械設備，液壓挖掘機的需求量也越來越大。但是，單斗液壓挖掘機在作業(yè)過程中負荷變化非常頻繁，能量損失很大。為有效降低能量損失，改善工作性能，本課題提出一種新型挖掘機負載敏感控制液壓系統(tǒng)，以兩負載為例完成液壓系統(tǒng)的設計和分析以及相應的電子控制系統(tǒng)的設計。 常見的挖掘機液壓控制系統(tǒng)有負流量控制、正流量控制和負載敏感控制三種類型，，其中負載敏感控制的節(jié)能效果、操作性能等更具優(yōu)勢。本文將插裝閥、電子泵和電液比例技術相結合，實現負載敏感控制。新系統(tǒng)用Valvistor調速閥對流量進行控制；用基于二通插裝閥的換向閥組對油液流向進行控制；電子泵輸出與系統(tǒng)所需相對應的壓力和流量。 本文首先應用仿真軟件AMESim完成Valvistor節(jié)流閥和調速閥的運動學建模和仿真，分析其控制特性和負載特性；然后完成兩負載工況下新型負載敏感液壓系統(tǒng)設計；最后以TTC60高速控制器為核心，完成新型負載敏感液壓系統(tǒng)電子控制系統(tǒng)的軟硬件設計，并進行調試試驗，驗證了控制系統(tǒng)的各項功能。
[Abstract]:With the improvement of engineering construction mechanization, the demand of hydraulic excavator, as the main mechanical equipment of earthwork, is increasing. However, the load of single bucket hydraulic excavator changes frequently and the energy loss is very large. In order to effectively reduce energy loss and improve working performance, this paper presents a new hydraulic system for load sensitive control of excavators. Taking two loads as an example, the design and analysis of hydraulic system and the design of corresponding electronic control system are completed. There are three types of hydraulic control system of excavator: negative flow control, positive flow control and load-sensitive control, among which the energy-saving effect and operation performance of load-sensitive control have more advantages. In this paper, the cartridge valve, electronic pump and electro-hydraulic proportional technology are combined to realize load sensitive control. The new system uses Valvistor speed regulating valve to control the flow rate; the reversing valve group based on two-way cartridge valve is used to control the flow direction of the oil; and the output of the electronic pump corresponds to the pressure and flow rate required by the system. In this paper, the kinematics modeling and simulation of Valvistor throttle valve and speed regulating valve are completed by using the simulation software AMESim, and the control characteristics and load characteristics of Valvistor throttle valve are analyzed, then the design of a new load-sensitive hydraulic system under two load conditions is completed. Finally, the hardware and software design of the electronic control system of the new load-sensitive hydraulic system is completed with the TTC60 high-speed controller as the core, and the debugging experiment is carried out to verify the functions of the control system.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU621

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本文編號：2411342