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valign="top"> <h6><img src="//cmsimgshow.zhuchao.cc/4935/20130220094715.jpg?path=www.sffwx.com/uploads/cp/20130220094715.jpg" width="194" height="194" onload="imgZoomer(this,194,194)" class="tip" /></h6> </td> <td valign="top" class="lines"> <table width="98%" border="0" cellspacing="0" cellpadding="0"> <tr> <th width="30%" valign="top"><h3><span class="hogh">产品名称Q?/span></h3></th> <td width="70%" valign="top"><span id="nesttitle">国伺服阀l修</span></td> </tr> <tr> <th width="30%" valign="top"><h3><span class="hogh">产品型号Q?/span></h3></th> <td width="70%" valign="top"></td> </tr> </table> </td> </tr> </table> </div> <div class="content"> <h2 class="hogh"><p>详细说明</p></h2> <div class="service ovflow"><p><P><FONT size=3>本品ؓQ国?b>伺服阀l修</b><BR>液压pȝ污染度要?BR>    </FONT><FONT size=3>伺服阀的用寿命和可靠性与工作液污染度密切相关。工作液不清z轻则媄响品性能Q羃短阀的寿命,重则使品不能工作。因此,使用者对pȝ工作液的污染度应予特别重视。用伺服阀的液压系l必d刎ͼ <BR>1.1 安装伺服阀的液压系l必进行彻底清z?BR>    </FONT><FONT size=3>新安装的液压pȝ\或更换原有管路时Q推荐按下列步骤q行清洗Q?<BR>A 在管路预装后q行拆卸、酸z、磷化;<BR></FONT><FONT size=3>B 然后在组装后q行\的冲z?BR>    </FONT><FONT size=3>\冲洗Ӟ不应装上伺服阀Q可在安装伺服阀的安装上装一冲洗ѝ如果系l本w允许的话,也可装一换向阀Q这样工作管路和执行元g可被同时清洗。向油箱内注入清zaQ清za选低_度的专用清za或同牌号的液压aQ,启动液压源,q{冲洗Q最好系l各元g都能动作Q以便清z其中的污染物)。在冲洗工作中应轻轻敲击子Q特别是焊口和连接部位,q样能v到除L锈和埃的效果。同时要定时查过滤器Q如发生堵塞Q应及时更换滤芯Q更换下来的Uo芯、化Uo芯、粉末冶金o芯不得清z后再用Q其他材质的滤芯视情况而定。更换完毕后Q再l箋冲洗Q直到a液污染度W合要求Q或看不到o油器滤芯污染为止?BR>1.3 使用流电液伺服阀的液压系la液推荐清z度{为:<BR></FONT><FONT size=3>2、对伺服攑֤器的要求Q?BR>    </FONT><FONT size=3>׃伺服阀马达U圈匝数较多Q具有很大的感抗Q所以伺服放大器必须是具有深度电负反馈的放大器。只有极响应较慢的pȝ才用电压反馈的放大器。电负反馈攑֤器输出阻抗比较大Q放大器和伺服阀U圈l成了一个一阶滞后环节,输出L大,那么q个一阶环节的频率高,对伺服阀的频带就不会有太大的影响。放大器的功率输出的一般原理图见图。不同的伺服pȝ对伺服放大器有各U不同的要求Q例如不同的校正环节Q不同的增益范围及其他功能。但Z保伺服阀的正怋用,阀Ҏ大器q提出:攑֤器要带有限流功能Q确保放大器最大输出电不至于烧坏U圈或不臛_起阀的其他失败。伺服阀应能耐受 2 倍额定电的负荷。再要有一个输零电位器Q因Z服阀一般容?2%的零偏,及工况不同的零漂Q在伺服阀寿命期内零偏允差可到 5%?%Q所以调零机构要可调10u %的额定电输出|某些伺服阀和系l还要求攑֤器带有颤振信号发生电路?<BR></FONT></P><span id="nestremark"></span></p> <p>上一条:<a href="/supply/10.html">柱塞늻?/a>    下一条:<a href="/supply/8.html">Amerrican伺服阀l修</a></p> <div class="tag">相关标签Q?a 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