机械5

QY25型液压起重机变幅油缸设计 摘要 伴随国内经济建设的飞速发展，我国的基础建设力度正逐渐加大。道路交通、机尝港口、水利水电、市政建设等基础设施的建设规模也越来越大。市场上液压起重机的需求也随之增加。液压起重机是一种使用广泛的工程机械，这种机械具有机动性好、工作适应性强、自备动力不需要配备电源、能在野外作业、操作简便灵活等特点，因此在交通运输、城建、消防、大型物料尝基建、急救等领域得到了广泛的使用。它对减轻劳动强度、节省人力、降低建设成本、提高施工质量、加快建设速度、实现工程施工机械化起着十分重要的作用。 本文着重对QY25型液压起重机液压系统的变幅液压缸进行研究和设计。本文主要任务是查阅相关的资料和文献，确定起重机变幅系统的方案以及变幅机构三铰点的位置。根据已知数据，对起重机的变幅液压缸的工作行程、导向长度、缸筒内径及活塞杆直径等进行设计和计算，然后对缸筒壁厚、外径和缸底厚度进行强度计算，活塞杆强度校核和稳定性进行验算。根据计算的数据画ProE
ngi
neer三维图形、AUTOCAD二维图形。变幅液压缸的设计与计算主要参照《新编液压工程手册》和《机械设计手册》中的公式。最终通过液压缸的设计达到本次设计的宗旨。 关键词：液压起重机、变幅液压缸、强度计算、强度校核 ABSTRACT With the rapid developme
nt of domestic eco
nomic co
nstructio
n, Chi
na's i
nfrastructure is gradually i
ncreasi
ng i
nte
nsity. Co
nstructio
n scale road tra
nsport, airports, ports,water utilities, mu
nicipal co
nstructio
n a
nd other i
nfrastructure is also growi
ng. Hydraulic cra
ne o
n the market dema
nd i
ncreases. Hydraulic cra
nes is awidely-used co
nstructio
n machi
nery, such machi
nery has good mobility, stro
ngwork adaptability, self-poweredwith a power supply is
not required, towork i
n the field, easy to operate a
nd flexible features, so the tra
nsportatio
n, co
nstructio
n, Fire, a large field of materials, i
nfrastructure, a
nd emerge
ncy a
nd other fields has bee
nwidely used. It reduces the labor i
nte
nsity, save ma
npower, reduce co
nstructio
n costs a
nd improve co
nstructio
n quality, accelerate the co
nstructio
n speed, realize co
nstructio
n mecha
nizatio
n plays avery importa
nt role. This article focuses o
n the QY25 hydraulic luffi
ng cra
ne hydraulic cyli
nder hydraulic system research a
nd desig
n. The mai
n task of this paper is to review the releva
nt i
nformatio
n a
nd docume
ntatio
n to determi
ne the locatio
n of the program aswell as luffi
ng luffi
ng mecha
nism of the three
nodes of the system. Accordi
ng to the k
now
n data o
n the hydraulic cyli
nder luffi
ng cra
neworki
ng stroke, the guide le
ngth, diameter a
nd pisto
n rod diameter cyli
nder desig
n a
nd calculatio
n, etc., a
nd the
n the cyli
nderwall thick
ness, diameter a
nd thick
ness stre
ngth calculatio
n Bottom pisto
n pole stre
ngth check a
nd stability checki
ng. Accordi
ng to the three-dime
nsio
nal graphics computi
ng pai
nti
ng ProE
ngi
neer, AUTOCAD two-dime
nsio
nal graphics. Luffi
ng cyli
nder desig
n a
nd calculatio
n of the mai
n refere
nce"New Hydraulic E
ngi
neeri
ng Ha
ndbook" a
nd"Mecha
nical Desig
n Ma
nual" i
n the formula. Ultimately achieve the aim of this desig
n by a hydraulic cyli
nder desig
n. Keywords: hydraulic cra
ne, luffi
ng cyli
nder, stre
ngth calculatio
n, stre
ngth check 目录 摘要I ABSTRACT II 第1章绪论3 1.1国内外汽车起重机的发展现状与趋势3 1.2 QY25型汽车起重机简介4 1.3液压传动在汽车起重机上的优点5 1.4本课题设计的价值5 1.5本课题设计的任务6 第2章变幅机构三铰点及油缸行程的确定8 2.1三铰点的运动和受力要求8 2.2臂架油缸铰点位置确定9 2.3变幅油缸行程的确定9 第3章变幅液压缸的设计与计算10 3.1变幅油缸活塞杆工作和返回速度的确定10 3.2变幅油缸推力的确定10 3.3变幅油缸压力的确定11 3.4变幅油缸缸筒内径D的确定11 3.5变幅油缸活塞杆的设计及直径d的确定12 3.6缸筒壁厚δ的确定13 3.7缸筒底部的设计14 3.8活塞的设计15 3.9活塞导向环的设计17 3.10进、出油口尺寸的设计18 3.11耳环尺寸的设计18 3.12缓冲装置的设计19 3.13排气装置的设计19 3.14密封装置的设计20 第4章变幅液压缸主要零件的校核22 4.1变幅油缸缸筒内径D的校核22 4.2缸筒壁厚δ的校核22 4.3缸筒底部的强度校核23 4.4活塞杆强度校核23 4.5连接零件的强度计算24 第5章结论26 参考文献27