间歇式垂直升降机构数字化设计+CAD图纸
毕业论文关键词：螺旋千斤顶；自锁；千斤顶；保养维护；
ABSTRACT Jack called weight lifting device, a top heavy machinery, lifting machine is a with relatively small force can the weight lifting, descending or shift of simple tools, can also be used to correct the deformation of the equipment installation and the deviation of the component such as. Jack is mainly used for industrial, transportation and other departments as vehicle repair and other lifting and supporting work. Its structure is light and strong, flexible and reliable, one person can carry and operate. Jack is made of rigid top lifts as a working device, through the bracket at the top or bottom bracket claws in the short distance in lifting weights in the light small lifting equipment, jack lifting height of 400mm, the lifting speed is generally 10-35mm/min, heavy power up to 500t. Jack according to the structure and the working principle of different, usually pided into mechanical and hydraulic and mechanical jacks and rack and two spiral, which screw jacks and hydraulic jack is more commonly used; because of small weight, laborious operation, so screw jack generally used only for mechanical maintenance work, in the repair of the bridge in the process does not apply. The hydraulic jack has the advantages of compact structure, stable operation and self locking action. The disadvantage is that the lifting height is limited, lifting speed is slow. Jack rack weight is generally not more than 20 tons, and because of the moisture moisture in the air to work on the docks, exposed in the air easily oxidized rust maintenance maintenance difficulties, so can not meet the design requirements. Hydraulic jack to meet the requirements of the weight, but because the working medium is hydraulic oil, easy to leak, not long time to support heavy weights or will cause pollution and even lead to dangerous accidents. So it can not meet the design requirements. The screw jack can not only meet the requirements, but also can support the heavy load for a long time. Select the proper sealing box to isolate the air. So choose screw jack.
Key words: Screw jack; self-locking; jack; maintenance。
目 录
第一章 绪论 1
1.1引言 1
1.2课题研究的基本内容 1
1.3设计任务 2
第二章 总体设计 3
2.1机构工作要求 3