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蛙式打夯机是我国首创的一种打夯机械。这种机械的偏心子转数是一个很重要的参数。关于它的极限转数,过去我们用实验方法确定,未能找出理论上的计算方法。本文在动力学分析的基础上,对极限转数进行了理论分析。图1是蛙式打夯机的外观图。一、机构运动简图为了分析方便,将机械简化为机构简图(见图2)。(1)假设该机对称于机体轴线的中间平面,因此空间机构可简化为平面机构; (2)将偏心子、摇杆、拖盘的重量分别集中在平面的三个重心上(质心),为C_1、C_2、
Frog-type tamping machine is the first of a kind of ramming machinery in our country. The number of eccentric rotations of such a machine is a very important parameter. With regard to its limit revolution, in the past we used experimental methods to determine, failed to find the theoretical calculation method. In this paper, based on the dynamic analysis, the theoretical analysis of the limit rotation number is carried out. Figure 1 is a frog ram appearance. First, the organization movement diagram In order to facilitate the analysis, the mechanical simplified into the organization diagram (see Figure 2). (1) Assuming that the aircraft is symmetrical with respect to the middle plane of the body axis, the space mechanism can be simplified as a plane mechanism; (2) The weights of the eccentric, the rocker and the tray are respectively concentrated on the three centroids of the plane For C_1, C_2,