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Roman";mso-hansi-font-family:"Times New Roman"">同步控制回路</span></b></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">所谓同步控制，是指驱动两个或多个执行机构时，使它们在运动过程中位置保持同步。实际上，同步控制是速度控制的一种特例。当各执行机构的负载发生变动时，要使它们保持同步，并非易事。为了实现同步，通常采用以下方法</span><span lang="EN-US">:</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">①使流人和流出执行机构的流量保持一定</span><span lang="EN-US">;</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">②利用机械连接使各执行机构同步动作</span><span lang="EN-US">;</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">③测出执行机构的实际负载，并对流人和流出执行机构的流量进行连续控制。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">下面介绍利用上述方法构成的各种同步控制回路</span><span lang="EN-US">:</span></p> <p class="MsoNormal"><b><span lang="EN-US"> 5. 1</span></b><b><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">利用节流阀的同步控制回路</span><span lang="EN-US"><o:p></o:p></span></b></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">最简单的气缸速度控制方法是采用调速阀进行出口节流调速。图</span><span lang="EN-US">5. 59</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">为</span><span lang="EN-US">.</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">使用出口节流调速阀</span><span lang="EN-US">3, 4, 5, 6</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的简单同步控制回路。采用这种同步控制方法，如果气缸缸径相对于负载足够大，工作压力足够高，则可以取得一定程度的同步效果。此外，在图</span><span lang="EN-US">5. 59</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">所示回路中，只使用了一只电磁阀</span><span lang="EN-US">7</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">，如果使用两只电磁阀，使两只气缸的给排气独立，相互之间不受影响，则同步控制效果会便好些。但上述同步方法都不能适应负载</span><span lang="EN-US">F}</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">和凡的变化较大的·场合，即当负载变化时，同步精度要降低。</span></p> <p><img src="/upload/images/201409/14110983217685.jpg" alt="" /></p> <p class="MsoNormal" style="text-align: center;"><span lang="EN-US"> </span><b><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体; color:blue;mso-font-kerning:0pt"><a href="http://www.bethel-cnc.com/"><span lang="EN-US">加工中心</span></a></span></b><span style="font-family: 宋体;">请选择 伯特利数控</span></p> <p class="MsoNormal"><b><span lang="EN-US">5. 2</span></b><b><span style="font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">利用气一液联动缸的同步控制回路</span><span lang="EN-US"><o:p></o:p></span></b></p> <p class="MsoNormal" style="text-align: center;"> </p> <p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">对于负载在运动过程中有变化，且要求运动平稳的场合，的效果。图</span><span lang="EN-US">5. 60</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">所示为用气一液联动缸构成的同步控制回路。使用气一液联动缸可取得较好图</span><span lang="EN-US">5. 60</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">平台上作用了两个不相等的负载</span><span lang="EN-US">F1</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">和</span><span lang="EN-US">F2</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，为使平台水平地上下移动，使用了由串联型气一液联动缸组成的同步回路。当回路中的电磁阀</span><span lang="EN-US">3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">的</span><span lang="EN-US">A</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">侧通电时，压力气体经过管路</span><span lang="EN-US">7</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">流人气一液联动缸</span><span lang="EN-US">1, 2</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的气缸中，克服负载</span><span lang="EN-US">F1</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">和凡推动活塞上升。此时</span><span lang="EN-US">.</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，在从梭阀</span><span lang="EN-US">7</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">来的先导压力作用下，常开型二通阀关闭</span><span lang="EN-US">.</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">，使气一液缸</span><span lang="EN-US">1</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的油缸上腔的油被压人气一液缸</span><span lang="EN-US">2</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">油缸的下腔，气一液缸</span><span lang="EN-US">2</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的油缸上腔的油被压人气一液缸</span><span lang="EN-US">1</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的油缸下腔，从而使它们保持同步上升。同样</span><span lang="EN-US">.</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，当电磁阀</span><span lang="EN-US">3</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">的</span><span lang="EN-US">B</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">侧通电时，可使气一液联动缸向下的运动保持同步。</span></p> <p class="MsoNormal"><img src="/upload/images/201409/14110986407333.jpg" alt="" /></p> <p class="MsoNormal" style="text-align: center;"><b><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋体; mso-bidi-font-family:宋体;color:blue;mso-font-kerning:0pt"><a href="http://www.bethel-cnc.com/bethel/cnc/show_37.html"><span 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