R901102360 HED8OH-20/100K14
R901107128 HED8OH-20/100K14A
R901106505 HED8OH-20/100K14AS
R901109535 HED8OH-20/100K14ASV
R901099780 HED8OH-20/100K14AV
R901106498 HED8OH-20/100K14KS
R901099788 HED8OH-20/100K14KSV
R901107122 HED8OH-20/100K14KW
R901109532 HED8OH-20/100K14KWV
R901095375 HED8OH-20/100K14S
R901108268 HED8OH-20/100K14SV
R901099775 HED8OH-20/100K14V
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R901315927 HED8OH-20/100K35S
R901421283 HED8OH-20/100U060K14S
R901108239 HED8OH-20/100U070K14S
R901099808 HED8OH-20/200K14
R901099809 HED8OH-20/200K14A
R901107119 HED8OH-20/200K14AS
R901109530 HED8OH-20/200K14ASV
R901099790 HED8OH-20/200K14AV
R901099811 HED8OH-20/200K14KS
R901099792 HED8OH-20/200K14KSV
R901107369 HED8OH-20/200K14KW
R901125810 HED8OH-20/200K14KWV
R901102362 HED8OH-20/200K14S
R901109074 HED8OH-20/200K14SV
R901099789 HED8OH-20/200K14V
R901148816 HED8OH-20/200K35KS
R901171767 HED8OH-20/200K35S
R901270140 HED8OH-20/200P110K14S
R901139168 HED8OH-20/200P145K14S
R901139169 HED8OH-20/200P185K14S
R901099813 HED8OH-20/200U150K14V
R901099814 HED8OH-20/200U180K14V
R901099793 HED8OH-20/200U185K14V
R901101640 HED8OH-20/350K14
R901107313 HED8OH-20/350K14A
R901108236 HED8OH-20/350K14AS
R901109071 HED8OH-20/350K14ASV
R901099816 HED8OH-20/350K14AV
R901106454 HED8OH-20/350K14KS
R901099817 HED8OH-20/350K14KSV
R901107095 HED8OH-20/350K14KW
R901109069 HED8OH-20/350K14KWV
R901102713 HED8OH-20/350K14S
R901109065 HED8OH-20/350K14SV
R901099815 HED8OH-20/350K14V
R901388617 HED8OH-20/350K35
R901417246 HED8OH-20/350K35AS
R901265207 HED8OH-20/350K35S
R901128257 HED8OH-20/50F004K14SV
R901219262 HED8OH-20/50F010K14V
R901102349 HED8OH-20/50K14
R901108007 HED8OH-20/50K14A
R901107086 HED8OH-20/50K14AS
R901109050 HED8OH-20/50K14ASV
R901099798 HED8OH-20/50K14AV
R901102356 HED8OH-20/50K14KS
R901099800 HED8OH-20/50K14KSV
R901107394 HED8OH-20/50K14KW
R901109049 HED8OH-20/50K14KWV
R901102712 HED8OH-20/50K14S
R901215098 HED8OH-20/50K14SV
R901099796 HED8OH-20/50K14V
R901156058 HED8OH-20/50K35KS
R901231720 HED8OH-20/50K35S
R901101658 HED8OH-20/630K14
R901109035 HED8OH-20/630K14AS
R901109039 HED8OH-20/630K14ASV
R901136386 HED8OH-20/630K14KS
R901307873 HED8OH-20/630K14KSV
R901336213 HED8OH-20/630K14KW
R901109029 HED8OH-20/630K14S
R901101649 HED8OH-20/630K14V
R901369355 HED8OH-20=200K14
R901342162 HED8OH-20=50K14
R901232375 HED8OH-20=50K14S
R987140394 HED8OH20/350K14+PISTOKE
R901102747 HED8OP-20/100K14
R901108229 HED8OP-20/100K14A
R901107790 HED8OP-20/100K14AS
R901162988 HED8OP-20/100K14ASV
R901321355 HED8OP-20/100K14AV
R901107997 HED8OP-20/100K14KS
R901107370 HED8OP-20/100K14KW
R901106509 HED8OP-20/100K14S
R901109028 HED8OP-20/100K14SV
R901108265 HED8OP-20/100K14V
R901437159 HED8OP-20/100K35
R901206318 HED8OP-20/100K35KW
R901127492 HED8OP-20/100K35S
R901354506 HED8OP-20/100P020K14S
R901354507 HED8OP-20/100P030K14S
R901109027 HED8OP-20/100P070K14S
R901102721 HED8OP-20/200K14
R901108023 HED8OP-20/200K14A
R901108003 HED8OP-20/200K14AS
R901109024 HED8OP-20/200K14ASV
R901137607 HED8OP-20/200K14AV
R901108258 HED8OP-20/200K14KS
R901108018 HED8OP-20/200K14KW
R901109010 HED8OP-20/200K14KWV
R901107093 HED8OP-20/200K14S
R901109004 HED8OP-20/200K14SV
R901107397 HED8OP-20/200K14V
R901336909 HED8OP-20/200K35S
R901233431 HED8OP-20/200P110K14S
R901108992 HED8OP-20/200P160K14S
R901106453 HED8OP-20/350K14
R901107326 HED8OP-20/350K14A
R901091138 HED8OP-20/350K14AS
R901108531 HED8OP-20/350K14ASV
R901126082 HED8OP-20/350K14AV
R901107914 HED8OP-20/350K14KS
R901107129 HED8OP-20/350K14KW
R901122124 HED8OP-20/350K14KWV
R901102365 HED8OP-20/350K14S
R901107913 HED8OP-20/350K14SV
R901107330 HED8OP-20/350K14V
R901127494 HED8OP-20/350K35S
R901434285 HED8OP-20/350P120K14KS
R901108252 HED8OP-20/350P140K14S
R901456336 HED8OP-20/350P280K14S
R901107083 HED8OP-20/50K14
R901107999 HED8OP-20/50K14A
R901107396 HED8OP-20/50K14AS
R901123736 HED8OP-20/50K14AV
R901108012 HED8OP-20/50K14KS
R901108249 HED8OP-20/50K14KW
R901106504 HED8OP-20/50K14S
R901140517 HED8OP-20/50K14SV
R901108001 HED8OP-20/50K14V
R901131275 HED8OP-20/50K35
R901336910 HED8OP-20/50K35S
R901159161 HED8OP-20/50K35V
R901245432 HED8OP-20/50U025K14AV
R901108147 HED8OP-20/630K14
R901210429 HED8OP-20/630K14A
R901280745 HED8OP-20/630K14AS
R901171255 HED8OP-20/630K14ASV
R901124650 HED8OP-20/630K14KS
R901315271 HED8OP-20/630K14KW
R901106449 HED8OP-20/630K14S
R901108529 HED8OP-20/630K14V
R901437158 HED8OP-20/630K35
液压传动技术已经广泛应用于很多工程技术领域,由于液压系统所服务的主机的工作循环、动作特点等各不相同,相应的各液压系统的组成、作用和特点也不尽相同。以下通过对几个典型液压系统的分析,进一步熟悉各液压元件在系统中的作用和各种基本回路的组成,并掌握分析液压系统的方法和步骤。
阅读一个较为复杂的液压系统图,大致可按以下步骤进行:
(1)了解设备的工艺对液压系统的动作要求;
(2)初步游览整个系统, 了解系统中包含有哪些元件,并以各个执行元件为中心,将系统分解为若干子系统。
(3)对每一子系统进行分析,搞清楚其中含有哪些基本回路,然后根据执行元件的动作要求,参照动作循环表读懂这一子系统。
(4)根据液压设备中各执行元件间互锁、同步、防干涉等要求,分析各子系统之间的联系。
(5)在全面读懂系统的基础上,归纳总结整个系统有哪些特点,以加深对系统的理解。
一,组合机床液压系统
组合机床液压系统主要由通用滑台和辅助部分(如定位、夹紧)组成。动力滑台本身不带传动装置,可根据加工需要安装不同用途的主轴箱,以完成钻、扩、铰、镗、刮端面、铣削及攻丝等工序。
有液压夹紧的他驱式动力滑台的液压系统原理图，这个系统采用限压式变量泵供油，并配有二位二通电磁阀卸荷，变量泵与进油路的调速阀组成容积节流调速回路，用电液换向阀控制液压系统的主油路换向，用行程阀实现快和工进的速度换接。
二,液压系统的特点
液压系统采用限压式变量泵和调速阀组成容积节流调速系统,把调速阀装在进油路上,而在回油路上加背压阀。这样就获得了较好的低速稳定性、较大的调速范围和较高的效率。而且当滑台需死挡铁停留时,用压力继电器发出信号实现快退比较方便。
采用限压式变量泵并在快进时采用差动连接, 不仅使快进速度和快退速度相同差动缸),而且比不采用差动连接的流量可诚小一倍,其能量得到合理利用,系统效率进一步得到提高。
采用电液换向阀使换向时间可调,改善和提高了换向性能。采用行程阀和液控顺序阀来实现快进与工进的转换,比采用电磁阀的电路简化,而且使速度转换动作可靠,转换精度也较高。此外,用两个调速阀串联来实现两次工进, 使转换速度平稳而无沖击。
夹紧油路中串接诚压阀,不仅可使其压力低于主油路压力,而且可根据工件夹紧力的需要来调节并稳定其压力;当主系统快速运动时,即使主油路压力低于减压阀所调压力,因为有单向阀的存在,夹紧系统也能维持其压力(保压)。夹紧油路中采用二位四通阀,它的常态位置是夹紧工件,这样即使在加工过程中临时停电,也不至于使工件松开,保证了操作安全可靠。
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