液压缸双梁铰接式剪叉升降平台布置方式优化设计

发布时间：2018-01-01 03:19

本文关键词：液压缸双梁铰接式剪叉升降平台布置方式优化设计　出处：《兰州理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：液压缸驱动的剪叉升降平台是一种广泛应用于仓库、机场、车站、码头、舞台、自动化生产线中的起重机械。它的性能直接决定了起重升降平台的承重性和舒适性,载物的剪叉升降平台要求液压缸活塞推力尽可能小,载人的剪叉升降平台则要求升降平台起升速度平稳。同时,液压缸的布置又因有限的安装空间而受到约束。因此,如何在有限的空间内布置剪叉升降平台的同时满足起重升降平台的承重性和舒适性,是提高起重升降平台的总体性能过程中急需解决的难题。本课题以双梁铰接式这一液压缸布置方式的剪叉升降平台为研究对象,对传统剪叉升降平台液压缸布置方式存在的液压缸活塞推力大,平台起升速度不平稳的问题进行了全面分析,力求寻找出一种在满足结构设计要求的条件下,能够减小液压缸活塞推力,使平台升降速度稳定的液压缸布置方式。本文首先利用理论力学对液压缸驱动的双梁铰接式升降平台运动学和动力学的研究,得出液压缸铰接位置与升降平台活塞推力及起升速度的关系式,分析了升降平台在升降过程中活塞推力、升降速度的变化规律,确定了影响升降平台活塞推力、升降速度的优化参数。其次,通过机械优化设计的相关理论,确定此机械优化设计属于多目标二元约束优化设计。通过比较,分别选取相应的优化方法,并根据各自流程图编写优化程序。分别得出在选定液压缸的情况下,活塞推力最小、升降速度最稳定以及同时满足活塞推力最小和升降速度最稳定三种不同条件下的液压缸铰接位置。并对优化结果进行了分析。最后,针对以上优化结果,对升降平台升降高度不足的问题,提出新的解决方案,并对解决方案进行比较,最终确定了整个液压缸驱动的剪叉升降平台的液压缸布置方案。通过对液压缸驱动的双铰接剪叉升降平台的运动学、动力学分析及机械优化设计,为进一步减小液压缸驱动的剪叉机构活塞推力,提高升降平台速度稳定性提供了理论依据和可行的优化设计方法。
[Abstract]:The shear - fork lifting platform driven by hydraulic cylinder is a lifting platform widely used in warehouse , airport , station , dock , stage and automation production line . Its performance directly determines the load - bearing capacity and comfort of lifting platform . The research object is to study the hydraulic cylinder piston thrust in the hydraulic cylinder arrangement mode of the traditional shear fork lifting platform , and to find out a hydraulic cylinder arrangement mode which can reduce the thrust of the piston of the hydraulic cylinder and stabilize the platform lifting speed under the condition of meeting the structural design requirements . In this paper , the kinematics and dynamics of the double - beam articulated lifting platform driven by hydraulic cylinder are studied by using the theory mechanics , and the relation between the hinge position of the hydraulic cylinder and the piston thrust and lifting speed of the lifting platform is obtained . The changing law of the piston thrust and the lifting speed of the lifting platform during the lifting process is analyzed , and the optimization parameters influencing the piston thrust and the lifting speed of the lifting platform are determined . Secondly , based on the theory of mechanical optimization design , it is determined that this mechanical optimization design belongs to multi - objective binary constrained optimization design . By comparison , the corresponding optimization method is selected , and the optimization procedure is written according to the respective flow chart . Finally , aiming at the above optimization results , the problem of insufficient lifting height of the lifting platform is solved , a new solution is put forward , and the solution is compared , and the hydraulic cylinder arrangement scheme of the whole hydraulic cylinder driven scissor lift platform is finally determined . Through the kinematics , dynamics analysis and mechanical optimization design of the double hinged shear fork lifting platform driven by the hydraulic cylinder , the theoretical basis and feasible optimization design method are provided for further reducing the piston thrust of the scissor mechanism driven by the hydraulic cylinder and improving the speed stability of the lifting platform .

【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH211.6

【引证文献】