MKD071B-097-GP0-BN我公司下屬機(jī)械汽車修理廠的檢修車間有兩臺(tái)st／10．5m橋式起重機(jī)，專供檢修機(jī)械及汽車時(shí)作起吊之用。由于檢修汽車時(shí)發(fā)動(dòng)機(jī)汽缸的找正，對(duì)電動(dòng)葫蘆的上升量及下降量的要求很嚴(yán)格，在某一位置時(shí)升降量必須很小，否則汽缸無法找正。這就要求電動(dòng)葫蘆必須具有點(diǎn)動(dòng)控制，但從廠家購回來的電動(dòng)葫蘆設(shè)有此裝置，它沒有嚴(yán)格的升降量，這對(duì)于汽車發(fā)動(dòng)機(jī)維修很不方便。由于這種實(shí)際操作的需要，MKD071B-097-GP0-BN我們對(duì)橋式起重機(jī)的電氣控制系統(tǒng)進(jìn)行改進(jìn)，在上升及下降的電氣回路中各增加一只中間繼電器 1ZJ（或 2ZJ），同時(shí)增加一個(gè)組合開關(guān) LK，其工作原理是利用交流接觸器和中間繼電器得電的時(shí)間差，從而實(shí)現(xiàn)點(diǎn)動(dòng)控
圖1 改裝后橋式起重機(jī)電氣線路圖
2電路的改裝方法
改裝后的電氣線路圖見圖1，虛線框內(nèi)為增設(shè)部分。把中間繼電器 IZJ的常閉輔助觸點(diǎn)串人到原來的上升回路中，把上升回路繼電器3C的常開觸
MKD071B-097-GP0-BN點(diǎn)和中間繼電器 IZJ的常開輔助觸點(diǎn)并接后，再與LKl、2ZJ的線圈串接并人上升國路中。同理，把中間繼電器ZZJ的常閉輔助觸點(diǎn)串人到原來的下降回路中，把下降四路繼電器4C的常開觸點(diǎn)和中間繼電器 ZZJ的常開輔助觸點(diǎn)并接后再與 L K。、 ZZJ的線圈串接并人上升回路中。LKl、LK2為同一個(gè)組合開關(guān) LK的兩對(duì)同向接點(diǎn)，當(dāng)它們斷開時(shí)此控制回路跟一般橋式起重機(jī)相同；當(dāng)LK組合開關(guān)合上時(shí)LK組合開關(guān)的兩組同向接點(diǎn)LKl、LK。同時(shí)接通，上升及下降回路處于點(diǎn)動(dòng)控制狀態(tài)。
3工作原理
MKD071B-097-GP0-BN當(dāng)總停開關(guān)KK合上時(shí)控制回路的總電源接通，交流接觸器 QC由于線圈得電而動(dòng)作，主電路中的QC主觸點(diǎn)閉合，主回路的總電源接通，此時(shí)主回路及控制回路處于工作準(zhǔn)備狀態(tài)。
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