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防fang爆bao起qi重zhong機ji采cai用yong的de是shi直zhi流liu盤pan式shi製zhi動dong器qi，屬shu於yu常chang閉bi製zhi動dong器qi，斷duan電dian時shi製zhi動dong器qi閉bi合he，起qi製zhi動dong作zuo用yong，通tong電dian時shi製zhi動dong器qi打da開kai，以yi便bian電dian機ji轉zhuan動dong，主zhu要yao由you整zheng流liu模mo塊kuai、直流線圈、摩擦片、製動盤和製動彈簧組成。
(1)吊車連續運行時間長而得不到充分散熱，將導致製動器溫升過高，絕緣材料失效而致使線圈匝間短路，從而燒毀製動器線圈；
(2)製動器線圈過載燒毀時產生的過電流擊穿了整流模塊的二極管；另一方麵是自身質量不過關，主要原因是印刷板質量差，元器件篩選不過關等因素也可能導致整流模塊的燒毀；
(3)youyuzhidongqitiaozhengdejianxixiao，diandongjiyunxingzhongbunengbimianmocapianyuzhidongpanwendemoca，diandongjiduocichangshijianyunxinghou，jiangshimocapianwendushenggao，zhanjiejiaoyinguoreshixiao，zhishizhidongqimocapianzhanjiechukailie，jiasulediandongjihezhidongqixianquandefare，bingbansuiyichangzaosheng。changshijianyunxingjiangdaozhidiandongjihezhidongqixianquanjueyuandesunhuai，shaohuidiandongjihuozhidongqi。
2 、改造方案
(1)選(xuan)用(yong)雙(shuang)電(dian)壓(ya)整(zheng)流(liu)模(mo)塊(kuai)。雙(shuang)電(dian)壓(ya)整(zheng)流(liu)模(mo)塊(kuai)的(de)應(ying)用(yong)可(ke)極(ji)大(da)改(gai)善(shan)製(zhi)動(dong)器(qi)線(xian)圈(quan)工(gong)作(zuo)的(de)性(xing)能(neng)，減(jian)少(shao)製(zhi)動(dong)器(qi)線(xian)圈(quan)的(de)發(fa)熱(re)。雙(shuang)電(dian)壓(ya)整(zheng)流(liu)模(mo)塊(kuai)仍(reng)采(cai)用(yong)單(dan)相(xiang)橋(qiao)式(shi)整(zheng)流(liu)電(dian)路(lu)，並(bing)采(cai)用(yong)可(ke)關(guan)斷(duan)的(de)電(dian)子(zi)開(kai)關(guan)電(dian)路(lu)來(lai)實(shi)現(xian)降(jiang)壓(ya)功(gong)能(neng)。當(dang)製(zhi)動(dong)器(qi)打(da)開(kai)後(hou)，製(zhi)動(dong)器(qi)線(xian)圈(quan)不(bu)需(xu)要(yao)太(tai)大(da)的(de)維(wei)持(chi)電(dian)流(liu)時(shi)，其(qi)整(zheng)流(liu)輸(shu)出(chu)電(dian)壓(ya)降(jiang)為(wei)全(quan)電(dian)壓(ya)的(de)一(yi)半(ban)，這(zhe)樣(yang)就(jiu)減(jian)少(shao)了(le)製(zhi)動(dong)器(qi)線(xian)圈(quan)的(de)溫(wen)升(sheng)，增(zeng)加(jia)了(le)製(zhi)動(dong)器(qi)線(xian)圈(quan)的(de)允(yun)許(xu)通(tong)電(dian)時(shi)間(jian)，提(ti)高(gao)製(zhi)動(dong)器(qi)線(xian)圈(quan)工(gong)作(zuo)的(de)可(ke)靠(kao)性(xing)。其(qi)原(yuan)理(li)如(ru)圖(tu)1：
圖1 雙電壓整流模塊電氣原理圖
1、過電壓保護 2、半波整流 3、電子開關 4、時間控製 5、全波整流
(2)zengdapanshizhiliuzhidongqixianquandeneizu。weigengjinyibutigaozhidongqixianquandegongzuoxingneng，zaicaiyongshuangdianyazhengliumokuaiweizhidongqixianquangongdiandetongshi，caiyonglezengdazhidongqixianquanneizudefangshilaijiangdizhidongqixianquanraozudedianliu，zaibaozhengzugoudadediancixiliyishizhidongqidakaideqiantixia，jiangzhuqishengdianjizhidongqixianquandeneizuyouyuanlaide264Ω增大到304Ω。降低了製動器線圈繞組的電流，從而最大限度改善了電機製動器的性能，經測試，現製動器線圈通電1 h(采用原整流模塊，線圈輸入直流電壓34 V)，製動器線圈溫升隻有80℃，且不再上升，達到了穩定溫升。
(3)xuanyongyeyatuiganzhidongqi。yeyatuiganzhidongqishikaotuiganzhongdediandongjidaidongyepianlunxuanzhuan，shiyouyechanshengxiangshangdetuili，bahuosaigantaiqi，congerdakaizhidongqi。duandianhou，zaizhidongjiazhudanhuangdezuoyongxia，shituigantuihuiyuanlaideweizhi。yeyatuiganzhidongqicaiyongsanxiangjiaoliudian，wuzhengliuhuanjie，shengqulezhengliumokuai，zaidianyuanfangmiankekaoxingjiaozhiliupanshizhidongqiyaogao，ciwai，yeyatuiganzhidongqizhidongmocapianzhijieyongtongmaodinganzhuangzaizhidongwakuaishang，bizhiliupanshizhidongqimocapianyongjiaozhanjie，jianquankekao，youyiguancha，yingjichulishidakaijiaoweifangbianshengshi(手動即可打開)。由於采用了防爆措施，製動器仍滿足改造前的防爆要求。
