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1993年曾修理过一台ZBn-H_2107FKYK轴向柱塞液压泵,该泵是上海建筑机械厂生产的WY100-SJ液压挖掘机的主泵。经拆卸分解后检查,该泵损坏严重:两个缸体中有三个铜套被拉出,且一个铜套与柱塞烧结在一起,一个回程板被拉断,主轴一个球窝孔变形,传动齿轮局部变形,八个球窝环中的六个严重变形等。修复后,投入使用已半年,该泵运行良好,未出任何故障。1 故障原因 经了解分析,该泵损坏完全是一起人为操作事故,由于系统液压油被污染,油中有杂质,工作时油中杂质曾运动到限压安全阀上,导致阀门关闭不严,此时出现系统运动缓慢、无力。在这种情况下,操作人员未对系统进行仔细分析和严格检查,就盲目调整限压安全阀的预紧力,致使所调值超过额定值。在液压缸运动到极限位置后,系统压力就会急剧增加到限压安全阀的调定值。虽然操作者要改变挖掘机的工作状态,但必然会有短暂的超额定工作压力的时间,主泵超负荷工作。如果长时间这样运行下去,必将导致液压泵损坏。另一方面,如果在遇到外载荷很大的情况时,安全阀就失去了作用,液压系统的压力随着负荷的增加而增加,最终导致液压泵超过最高工作压力而损坏。2 修复方法及装配中注意2.1 修复及更换的零件 针对拆卸后检查发现的问题,在修复过程中,我们采取了以下措施:将主轴上
In 1993, it repaired a ZBn-H_2107FKYK axial piston hydraulic pump, which is the main pump of WY100-SJ hydraulic excavator produced by Shanghai Construction Machinery Factory. After disassembly and disassembly inspection, the pump was severely damaged: three copper sleeves in the two cylinders were pulled out, and one copper sleeve and the plunger were sintered together, a return plate was pulled off, a ball hole of the main shaft was deformed, Local deformation of the gear, six of the eight ball and socket rings, and other serious deformation. After repair, put into use for six months, the pump is running well, without any failure. A failure to understand the analysis, the pump is completely damaged man-made operation of the accident, due to system hydraulic oil is contaminated oil impurities, working oil impurities have moved to the pressure-limiting safety valve, resulting in lax valve closure, this System movement appears slow, weakness. In this case, the operator did not carefully analyze the system and a rigorous examination, blindly adjust the preload pressure relief valve, resulting in the value of the adjusted value exceeds the rated value. After the hydraulic cylinder reaches the limit position, the pressure of the system will increase sharply to the setting value of the pressure limiting safety valve. Although the operator wants to change the working status of the excavator, it is bound to have a short period of time exceeding the rated working pressure and the main pump is overloaded. If this continues for a long time, will result in damage to the hydraulic pump. On the other hand, if the external load in a large case, the safety valve is out of effect, the hydraulic system pressure increases with the load increases, eventually leading to more than the maximum working pressure of the hydraulic pump damage. 2 repair methods and assembly of attention 2.1 repair and replacement parts for the disassembly inspection found problems in the repair process, we have taken the following measures: The spindle