目录

第一章  设计任务书····························································2

1.1设计任务书··························································2

第二章  概述··································································2

2.1千斤顶的概述························································2

2.2 螺旋千斤顶的受力分析图··············································3

2.3千斤顶的功用及工作原理··············································4

第三章  千斤顶的设计与计算····················································4

3.1 螺杆的设计与计算····················································4

3.1.1 螺杆螺纹类型的选择··············································4

3.1.2 选取螺杆材料····················································4

3.1.3 确定螺杆直径····················································4

3.1.4 自锁验算························································5

3.1.5 结构····························································5

3.1.6螺杆强度计算·····················································6

3.1.7稳定性计算·······················································7

3.2 螺母设计与计算·······················································8

3.2.1选取螺母材料·····················································8

3.2.2确定螺母高度H及螺纹工作圈数u·····································8

3.2.3校核螺纹牙强度···················································8

3.2.4 安装要求·························································9

3.3托杯的设计与计算·····················································9

3.4手柄设计与计算······················································10

3.4.1 手柄材料························································10

3.4.2 手柄长度····················································10

3.4.3手柄直径····················································11

3.4.4 挡圈····························································11

3.4.5计算传动总效率η················································11

3.5底座设计····························································11

第四章   设计总结···························································12

第一章 设计任务书

1.1设计任务书

螺旋千斤顶构件设计（力学模型设计）：

 1. 设计螺旋千斤顶受力构件，进行受力分析和截面设计；

 2. 编写设计计算说明书，包括：理论依据；计算公式，设计的实用性、先进性、经济性；

3.要求螺旋千斤顶其最大起重量为F=48KN和最大提升高度为H’=200mm；且耐磨性好。

第二章 概述

2.1 千斤顶的概述

千斤顶，又称举重器，是起重吊装作业中的一种常用工具。它具有轻巧简便，维护方便等优点。在吊装作业中，靠它可用很小的力顶起很重的机械设备，又可拨正设备安装的偏差和构件的变形等。同时，千斤顶还可以用多次重复递升的方法来达到很大的起升高度，且无冲击震动，因而被广泛用于安装和检修工作中。千斤顶是一种起重高度小(小于1ｍ)的最简单的起重设备。主要用于厂矿、交通运输等部门作为车辆修理及其它起重、支撑等工作。其结构轻巧坚固、灵活可靠，一人即可携带和操作。千斤顶是用刚性顶举件作为工作装置，通过顶部托座或底部托爪在小行程内顶升重物的轻小起重设备。千斤顶的顶升高度一般为100～400mm，起重能力最大可达500t，白重约为10～500kg。常见千斤顶按其构造及工作原理，可分为齿条式、螺旋式（图2.1）和油压式三种。螺旋千斤顶是由铸铁底座，固定在外壳内的螺母和螺杆所组成，在螺杆上端装有托盘用以支承载荷，手柄用来旋转螺杆，螺杆后端的粗大的部分可防止螺杆完全旋出。对于工作场所受限制的地方，手柄不能转动整个或半个圆周时，可用棘轮扳手旋转螺杆。这种千斤顶的螺杆的螺旋角度小，自锁好，因而在顶重后能自动制动，不会自动下降，不需要装安全摇柄。工作平稳、准确、可靠(有自锁作用)，构造简单耐用，因此，在安装工作中用得较多。

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