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    中华视窗  
    高温环境下起重机液压系统维护
    作者:佚名  来源:网络  时间:2019-9-29 16:29:11

    正常工作状态下,液压系统(Hydraulic systems)液压油的温度(temperature)一般在40~60℃之间,不应超过80℃。温度过高会增大运动部件间的磨损、加速液压系统密封件的老化和液压油的氧化变质,影响工程正常运行。
    高温天气下,起重机液压(hydraulic)系统油温高温故障将增多,会使油的粘度变化,引起液压元件及系统内的排放量的增加,将导致(cause)泵和电动机、发动机的容积率;阻尼孔或换向阀的温度的增加也可能改变原来的速度和性能;油膜润滑温度升高增加研磨,危害非常大。
    起重机液压(hydraulic)系统(Hydraulic systems)(system)温度过高原因分析(Analyse)及处理(chǔ lǐ):
    原因一:液压油选择不当主液压油不是品牌产品(Product),油的粘度变化速度过快,这将堵塞滤清器或散热器,使压力损失增大,发热增加。
    解决办法:要保持油液的清洁,并及时更换液压(hydraulic)油。
    注意(attention)事项:一般用液压(hydraulic)油箱空气过滤器的用户往往不重视,当施工现场粉尘(形态:固体微粒)多时,粉尘容易吸入液压油箱。另外,在更换关闭泵或马达时,必须清洁液压油油箱和滤清器,因为旧件破碎的金属粉末也可能造成感染。
    原因二:液压元件(Hydraulic element)磨损严重液压元件磨损严重造成液压系统(Hydraulic systems)内泄,发热量(Heat)增加。
    解决办法:必须按照规定,定时检修,发现磨损及时更换。气液增压缸厂家增压缸在设计时所选用的液压油价质为 VG68#抗磨液压油,不可撤擅自改用其它液体介质(如机油.水等)。
    原因三:设计不合理
    若系统设计不合理,存在设计,加工,装配缺陷,则系统在工作过程中有大量压力损失导致液压油发热。
    解决办法:这种情况可安装散热器(降低设备运转时所产生的热量),增加管直径。气液增压缸厂家增压缸在设计时所选用的液压油价质为 VG68#抗磨液压油,不可撤擅自改用其它液体介质(如机油.水等)。
    原因四:调试不当若液压(hydraulic)系统调试不当,安全阀(作用:控制压力不超过规定值)限定压力调整过高或过低,会引起系统发热增加。
    解决办法:在调试前,必须要认真检查安全阀(作用:控制压力不超过规定值)压力值,谨慎调节。
    原因五:系统(system)散热不足散热器、油箱表面过脏,造成散热器散热孔堵塞,导致散热不畅,同时液压(hydraulic)油箱表面散热受阻,造成系统液压温度(temperature)升高。
    解决办法:必须要定期清洁,防止阻塞。气液增压缸型号缸在设计时工作环境内的温度已定,若因工作需要变换工作环境超过温度需与增压缸技术相关人员联系处。
    原因六:风扇转速太低风扇转速太低,造成散热风量最大化减少,散热量不足。
    解决办法:高温作业时,定期巡查散热风扇转速是否降低。
    原因七:超负荷工作环境温度高或连续超负荷、长时间工作,也会使系统(system)温度过高。
    解决办法:可调节作业时间,选择夜晚等低温时段作业。




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