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Old 20th March 2008, 04:26 AM
rilila rilila is offline
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Join Date: 20th March 2008
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Exclamation Attentions!Do you need bp,rdns,and direct mailing server?

we are provider of bp server,rdns and direct mailing server in China.And already have a lot customers in foreign countries.Do you have interests on it?
Our server is more stable and direct mailing server will work greatly .
best specs and best service and best price! come on~~~
have a try , we can talk about first .
waiting for u 24hrs every day .
contact me .
msn :ninecat2006@hotmail.com
icq :328-996-526
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Old 6th June 2008, 03:50 AM
abcd515 abcd515 is offline
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Join Date: 5th June 2008
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Wink 升降机工作原理

升降机工作原理 液压油由叶片泵形成一定的压力,经滤油器、隔爆型电磁换向阀、节流阀、液控单向阀、平衡阀进入液缸下端,使 液缸的活塞向上运动,提升重物,液缸上端回油经隔爆型电磁换向阀回到油箱,其额定压力通过溢流阀进行调整, 通过压力表观察压力表读数值。 液缸的活塞向下运动(既重物下降)。液压升降机液压油经防爆型电磁换向阀进入液缸上端,液缸下端回油经平衡阀、液控单向阀、节流阀、隔爆型电磁换向阀回到 油箱。为使重物下降平稳,液压机械制动安全可靠,在回油路上设置平衡阀,平衡回路、保持压力,使下降速度不受重物而变化,由节流阀调节流量, 控制升降速度。 为使升降平台制动安全可靠,防止意外,增加液控单向阀,即液压锁,保证在液压管线意外爆裂时能安全自锁。安装了超载声控 报警器,用以区别超载或设备故障。 电器控制系统通过防爆按钮SB1—SB6来控制电机的转动,隔爆型电磁换向阀的换向,以保持载荷提升或下降 ,且通过“LOGO”程序调整时间延迟量,避免升降机频繁起动而影响使用寿命
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