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图1为某塔式起重机升降液压系统原理图,采用双向液压锁的平衡锁紧回路。由于双向液压锁5的作用,当阀4处于中位时,液压泵1卸荷,液压缸6被锁紧在任意位置上。当阀4处于右位时,为顶升工况;处于左位时,为下降工况。 根据现场观察,当塔机的升降液压系统处于下降时,液压缸及其所支承的部件产生明显的“爬行”现象。此“爬行”并非常见的低速爬行,而是快速降、停相交替的不连续的跳跃运动,从而产生振动。
Figure 1 is a tower crane lifting hydraulic system schematic diagram, the use of two-way hydraulic lock balance lock loop. Due to the bi-directional hydraulic lock 5, when the valve 4 is in the neutral position, the hydraulic pump 1 is unloaded and the hydraulic cylinder 6 is locked in any position. When the valve 4 is in the right position, it is the lifting condition; when in the left position, it is in the lowering condition. According to the site observation, when the hoisting and lowering hydraulic system of the tower crane is in decline, the hydraulic cylinder and the parts supported by it have obvious “crawling” phenomenon. This “crawling” is not a common low-speed crawling, but the rapid fall, stop alternating discontinuous jump movement, resulting in vibration.