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摘 要
螺旋千斤顶又称机械式千斤顶，是由人力通过螺旋副传动，螺杆或螺母套筒作为顶举件。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。螺旋千斤顶主要是有螺杆、手柄、底座、螺套、旋转杆、挡环、托杯的零部件组装而成的。
机械设计在国民经济发展中起着重要的作用，机械工业担负着为国民经济部门提供各种性能先进，价格低廉，使用安全可靠，造型美观的技术装备的任务，在国家现代化建设中举足轻重。机械产品的市场竞争能力主要取决于产品的质量，而产品的质量又取决于产品的设计。本次设计是产品开发周期中的关键环节，设计决定了实现产品功能和目标的方案，结构和选材。制造方法以及产品运行，使用和维修方法。产品设计上的缺陷造成的先天不足，难以采取制造和使用措施加以弥补。少数情况下，即有可能，损失也大。严重的设计不合理甚至会造成的产品不能用或产品制造不出来，导致产品开发失败。
关键字：螺旋千斤顶；螺旋传动；体积小；
Abstract
Screw jack, also known as mechanical jack, is manned by screw drive, screw or nut sleeve as the top piece. Mainly used for factories and mines, transportation and other departments as vehicle repair and other lifting, support and so on. Its structure is light and strong, flexible and reliable, one can carry and operate. Screw jack is a screw, handle, base, screw sets, rotating rod, retaining ring, care cups assembled from the parts.
Mechanical design plays an important role in the development of national economy. The machinery industry is responsible for providing the national economy with all kinds of advanced equipment, low cost, safe and reliable and beautiful technical equipment. It plays an important role in the modernization of the country. The market competitiveness of mechanical products depends mainly on the quality of the product, and the quality of the product depends on the product design. This design is the key part of the product development cycle, the design determines the realization of product features and objectives of the program, structure and selection. Manufacturing methods and product operation, use and maintenance methods. Product design defects caused by congenitally deficient, it is difficult to take manufacturing and use measures to make up. In a few cases, it is possible that the loss is also large. Serious design unreasonable or even cause the product can not be used or product manufacturing does not come out, leading to product development failure.
Key words: screw jack; screw drive; small size;
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