毕业设计-挖掘机液压系统设计.zip

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毕业设计(论文)任务书毕业设计(论文)任务书学生姓名: 学号:学 院: 专业:机械设计制造及其自动化任务起止时间: 2017 年 2 月 27 日至 2017 年 6 月 23 日毕业设计(论文)题目: 挖掘机液压系统设计毕业设计工作内容:1、查阅资料、外文翻译,完成开题报告; (第 1-2 周)2、挖掘机液压系统总体方案设计; (第 4-5 周)3、具体结构设计; (第 6-9 周)4、绘制液压系统布置图 1 张(A0)和液压原理图; (第 10-13 周)5、撰写论文、准备答辩。 (第 14-16 周)资料:1.余涵,冯培恩,洪昌银等单斗液压挖掘机北京:中国建筑工业出版社,19802.许福玲,杨文生,陈尧明等液压与气压传动北京:机械工业出版社,20053.吴宗泽机械设计使用手册M北京 : 化学工业出版社,1999,2006(2) 4.本刊编辑部,唐懿,陈正利,戴晴华,黄祥全,李新生,程广捷,唐向阳,陈慧明国产挖掘图为J工程机械与维修,2005, (1) 指导教师意见:签名:年 月 日系主任意见:签名:年 月 日教务处制表-1-附录 APiezoelectric hydraulic drive design and testing Jason Randle, Eric Anderson ,MaKeDong Raigor Prague.Abstract:This paper introduces the design method of smart material is to build a use of hydraulic fluid dynamic provide the drive. In described drives, hydraulic oil from the hard drive of the frequency of piezoelectric or other intelligent material separation output cylinder of running frequency. This kind of decoupling permitted in high frequency piezoelectric driven by extracting substances, large energy highest in low frequency, and hydraulic cylinder driving provide long stroke. However, due to follow the compressibility of fluid and structural, basic impedance matching and fluid piezoelectric hard to energy conversion between pressurized piezoelectric hydraulic overflows into. In materials, mechanical design, and fluid mechanical interface field of basic design weigh and important technical problems is debatable. Puts forward prototype equipment and components measurement. Introduce test methods, test quantitative pump, pressure and flow out power and speed. A series of experiments show that by intelligent materials with powerful long stroke drive the possibility of the device. Keywords: piezoelectric, intelligent materials, piezoelectric hydraulic, drive, power wires, pumps 1introduction Intelligent piezoelectric materials, such as magnetic limit and electric limited in precise control long-term use. Because of its deformation ability is limited, these materials are usually not used for large linear motion drive. The last decades appear relied on various techniques to increase from the driving force of smart material core design. One common is the mechanical amplifier or transformation, such as those who are using the lever and the fulcrum, and repeat types, such as step, peristalsis. Recently, researchers have realized integrated intelligent materials and liquid, make a fundamental part of the pump to the possibility of using linear driver. This new method to realize long stroke -2-high power drive. And includes regular servo hydraulic and various electromagnetic type, compared to other types of drive, piezoelectric hydraulic drive has his merits and demerits. Compared with the traditional hydraulic pressure, the main advantage displays in wire aspects, namely, eliminate hydraulic distribution circuit. Compared with electromagnetic method, including motor drive the ball screw, piezoelectric hydraulic drive with powerful hydraulic and potentially more rapid response time. Compared with conventional methods, a new type of drive in thermal hydraulic oil distribution and have drawbacks. Compared with electromagnetic drives, although use a small amount of hydraulic oil, new drive still need electrical and hydraulic integration. Piezoelectric hydraulic drive many of these characteristics and electric limit drives (EHAs) is the same, such as joint strike fighter planes in. EHAs than other piezoelectric hydraulic drive in the energy density of piezoelectric materials themselves have a potential advantage. Extracting this energy is a daunting task, this paper tries to describe many current development efforts some of the challenges. The overall design goal is to through different stages by piezoelectric stack components by a drive conversion power input output VAT will mechanical power to external load. Piezoelectric smart material, design began piezoelectric fluid interface, extends across the valve, and finally to output cylinder. Although the electronic drive drive in other local discussion, but it is also a consideration. Like many system, overall design is a comprehensive and repeated work, a single component can be design, but need to design combined with other subsystems. Subsystem and system level in this process test components. Tests to individual elements of the interaction between niv as characteristics. The total output (mechanical equipment strength, speed, or power) measure and maximization is the ultimate goal. This paper expounds the solid-liquid mixture drive, the operation and prominent illustrate the basic concept of the limitations. Put forward the design concept of actuators, and expounds the next each key subsystems. Review of important priority piezoelectric properties of application. Decided to pressure the room design and describing the prototype device. Analysis of some or all parts of test methods and characteristics of the value of each method is emphasized. This article through the test results and explain how ge
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