机械5

摘要 在当代工业的发展中，随着设计技术的不断提升，对制造业的要求也越来越严格。由于剪切机不论是在轻工业还是在重工业中都有着广泛的应用，所以有效地提高剪切机的工作效率以及工作性能是很有必要的。 传统剪切机在平时生产使用的过程中存在的噪音大、占地面积大、灵活性差容易磨损等问题，这些问题极大地影响了我们的生产效率。为了解决这些影响生产效率的问题我们决定传统剪切机进行改造。 为了达到改良的目的，我们利用液压传动控制技术对剪切机进行改造。由于液压传动能使执行元件的运动十分均匀稳定，可使运动部件换向时无换向冲击。而且由于其反应速度快，故可实现频繁换向。再加上其操作简单，调整控制方便，易于实现自动化。特别是和机、电联合使用时，能方便地实现复杂的自动工作循环。 液压剪切机相较于传统的机械剪切机来说能很好的解决噪音大、灵活性不足等问题，有效地弥补了机械性能上的不足。 此次设计的新形式的液压剪切机能够更好地服务于剪切行业的发展，更好地适应国内外市场的需求，因此具有良好的市场前景。 关键词：剪切机；液压系统；液压元件 Abstract I
n the developme
nt of moder
n i
ndustry,with the improvi
ng of the desig
n tech
nology,It is becomi
ng more a
nd more strict to the requireme
nt of ma
nufacturi
ng. Due to the shear machi
newhich iswidely used i
n both light i
ndustry a
nd heavy i
ndustry, it isvery
necessary to improve theworki
ng efficie
ncy a
nd theworki
ng performa
nce of sheari
ng machi
ne. I
n the process of productio
n,the traditio
nal sheari
ng machi
ne usually makes much
noise a
nd occupymuchspace a
nd it is easy towear a
nd it also i
nflexible, that issues are greatly affect our productivity. To improve these issues,we decided to tra
nsform the traditio
nal shears. I
n order to achieve the purpose,,we used the hydraulic pressure drive co
ntrol tech
nology to modify the shears.Because the moveme
nt of hydraulic tra
nsmissio
n ca
n make actuatorsvery u
niform a
nd stable, a
nd it alsoca
n make the movi
ng partswithout reversi
ng impactwhe
n reversi
ng. A
nd because of its fast respo
nse,which ca
n realize freque
nt commutatio
n.added to its simply operatio
n, easy to co
ntrol, easy to realize automatio
n. Especiallywhe
n usedwith machi
ne, electric, it ca
n easily achieve the complex automaticwork cycle. Comparedwith the traditio
nal mecha
nical shear,the Hydraulic shears ca
n solve the problem of large
noise, lack of flexibility, ect. The desig
n of the
new form of hydraulic shears ca
n better service to the developme
nt of shear a
nd better adapt to the dema
nd of the market both at home a
nd abroad, so,it has a good market prospect. Keywords: Sheari
ngmachi
ne; Hydraulicsystem; Hydrauliccompo
ne
nts 目录 绪论4 1液压剪切机的初步介绍5 1.1剪切机的类型、特点及选型5 1.2剪切机轧制生产线位子及种类6 1.3剪切理论7 1.4液压剪的组成8 2液压剪切机的设计与计算9 2.1设计参数9 2.1.1机架9 2.1.2平行刀片剪切机剪刃行程11 2.1.3剪刃尺寸12 2.2剪切机理论空行程次数14 2.3机构的受力分析14 2.3.1滑轨连杆式液压剪的受力分析14 2.3.2液压缸及液压马达的设计计算22 2.3.2.1液压缸22 2.3.2.2计算液压缸的主要尺寸25 2.3.3液压缸的结构设计29 2.3.4液压元件的选择34 2.3.4.1液压泵的选择34 2.2.4.2电动机功率的确定34 3单层下切式剪切机控制系统初步方案35 4总结37 参考文献38