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一、液压架设机构的工作原理及设计特点整体拖运、快速安装的下回转塔式起重机可用液压架设机构进行立塔和臂架的折叠。图1为液压架设机构的工作原理图。它是一个用油缸驱动的平面杆件系统,由八个杆件组成。立塔、伸塔、折叠是通过导杆机构(由杆件1、2、3、4组成)、四杆机构(由杆件1、4、7、8组成)和曲柄连杆机构(由杆件4、5、6、8组成)联合动作一次完成。操纵液压换向阀,油缸通过导杆机构使外塔架4托着内塔架5从水平位置逐渐起立。与此同时作为四杆机构曲柄的外塔架4迫使拉杆7摆动,从而使臂架6通过铰点销轴推动内塔架5平稳伸出。由于作为滑块的内塔架在运动中对作为导轨的外塔架产生一定的横向压力,故在内、外塔架之间装有导向滚轮。塔架直立后与平台固接。最后打开臂架与四杆机构铰点销轴的连接扣件,接好臂架,顶紧外塔架端部的四个小螺
1. Working Principles and Design Features of Hydraulic Structuring Mechanisms The overall hauling and rapid installation of lower pylon cranes can be used to hydraulically erect the folding of the towers and booms. Figure 1 shows the working principle of the hydraulic erection mechanism. It is a flat rod system driven by a cylinder and consists of eight rods. The tower, tower, and fold are formed by a guide mechanism (composed of rods 1, 2, 3, and 4), a four-bar mechanism (composed of rods 1, 4, 7, and 8) and a crank linkage mechanism (by the rod Parts 4, 5, 6, and 8) The joint action is completed once. The hydraulic reversing valve is operated, and the cylinder is guided by the guide mechanism so that the outer tower 4 lifts the inner tower 5 from the horizontal position gradually. At the same time, the outer tower 4 which is the crank of the four-bar linkage forces the swinging rod 7 so that the boom 6 pushes the inner tower 5 smoothly through the hinge pin. Since the inner tower as a slider generates a certain lateral pressure on the outer tower as a guide during movement, a guide roller is installed between the inner tower and the outer tower. After the tower is erected, it is fixed to the platform. Finally, open the connection fasteners between the boom and the four-bar hinge pin and connect the boom to tighten the four small screws on the end of the outer tower.