1:橋式類型起(qi)重機
通(tong)用(yong)橋(qiao)式(shi)(shi)起重(zhong)機(ji)(ji)以及各種冶金專(zhuan)用(yong)橋(qiao)式(shi)(shi)起重(zhong)機(ji)(ji)過去多采用(yong)沿軌道布置的(de)(de)(de)(de)導(dao)電(dian)(dian)角鋼與集電(dian)(dian)滑塊構成的(de)(de)(de)(de)架空滑線(xian)系統。安全(quan)(quan)規程規定(ding)〔 ”把司機(ji)(ji)室與集電(dian)(dian)滑塊分別布置在主梁的(de)(de)(de)(de)兩端保(bao)證安全(quan)(quan)。其實這只能保(bao)證單層安裝橋(qiao)式(shi)(shi)起重(zhong)機(ji)(ji)的(de)(de)(de)(de)安全(quan)(quan), 如(ru)果在同一跨內(nei)設有兩層起重(zhong)機(ji)(ji),下層的(de)(de)(de)(de)滑線(xian)對(dui)于上(shang)層起重(zhong)機(ji)(ji)的(de)(de)(de)(de)吊素具(ju)仍然能構成威(wei)脅。特(te)別是露天安裝的(de)(de)(de)(de)起重(zhong)機(ji)(ji),滑線(xian)受到風(feng)霜雨雪的(de)(de)(de)(de)侵(qin)害,對(dui)安全(quan)(quan)和使用(yong)可靠(kao)性(xing)會(hui)帶來不利的(de)(de)(de)(de)影響。
近年來(lai),國內(nei)許(xu)多起重機生產廠(chang)和用(yong)戶開(kai)(kai)始(shi)采(cai)用(yong)安(an)全(quan)節(jie)能滑(hua)(hua)(hua)導線(xian)(xian)代替(ti)老(lao)(lao)式(shi)的(de)滑(hua)(hua)(hua)觸線(xian)(xian)。這(zhe)種安(an)全(quan)節(jie)能滑(hua)(hua)(hua)導線(xian)(xian)是(shi)封閉的(de),外圍是(shi)開(kai)(kai)口的(de)絕緣盒(he),可以保證(zheng)安(an)全(quan) 地移動供電。它的(de)滑(hua)(hua)(hua)導線(xian)(xian)是(shi)擠壓(ya)出來(lai)的(de)異(yi)型截面鋁導線(xian)(xian),用(yong)石墨(mo)碳刷(shua)集(ji)電,碳刷(shua)架帶有自位恒壓(ya)隨動裝置,保證(zheng)碳刷(shua)與(yu)導線(xian)(xian)間的(de)良好(hao)接觸。由于鋁和石墨(mo)碳 刷(shua)的(de)導電性能比鋼鐵好(hao),因而能節(jie)約(yue)能耗。這(zhe)種安(an)全(quan)節(jie)能滑(hua)(hua)(hua)導線(xian)(xian)國內(nei)已(yi)有不少生產廠(chang)家,用(yong)來(lai)代替(ti)老(lao)(lao)式(shi)的(de)滑(hua)(hua)(hua)觸線(xian)(xian)非常方便。
2:門式(shi)和門座等帶下(xia)部支(zhi)承(cheng)結構起重機
這些大(da)(da)型起(qi)(qi)重(zhong)(zhong)機的(de)(de)自(zi)重(zhong)(zhong)大(da)(da),大(da)(da)車(che)(che)運(yun)行距離也比(bi)(bi)較(jiao)長。過(guo)去的(de)(de)移動供電(dian)(dian)(dian)裝(zhuang)置(zhi)(zhi)(zhi)多采用(yong)敷設在(zai)地溝里的(de)(de)滑(hua)(hua)觸線,地溝比(bi)(bi)架空(kong)的(de)(de)滑(hua)(hua)觸線安全,但(dan)不論地溝或架空(kong)的(de)(de)滑(hua)(hua)觸線都會在(zai)表面(mian)(mian)(mian)積(ji)垢,而且敷設用(yong)的(de)(de)零件常常要(yao)更換,影響(xiang)起(qi)(qi)重(zhong)(zhong)機的(de)(de)安全運(yun)行。新建的(de)(de)這類起(qi)(qi)重(zhong)(zhong)機主(zhu)要(yao)采用(yong)電(dian)(dian)(dian)纜(lan)卷(juan)筒供電(dian)(dian)(dian),電(dian)(dian)(dian)纜(lan)利(li)用(yong)卷(juan)筒收(shou)放(fang),架設比(bi)(bi)較(jiao)簡單。電(dian)(dian)(dian)纜(lan)比(bi)(bi)滑(hua)(hua)觸 線安全, 如果 在(zai)地 面(mian)(mian)(mian) 設 置(zhi)(zhi)(zhi) 托(tuo)纜(lan)滑(hua)(hua)車(che)(che), 電(dian)(dian)(dian)纜(lan)壽命相 當長, 一(yi)般不需 要(yao)維修(xiu)。 但(dan) 電(dian)(dian)(dian)纜(lan)拖 在(zai)地面(mian)(mian)(mian)上(shang), 應(ying)(ying)嚴(yan)格(ge)禁止車(che)(che)輛 從上(shang) 面(mian)(mian)(mian)通(tong) 過(guo),電(dian)(dian)(dian)纜(lan)卷(juan)筒在(zai)起(qi)(qi)重(zhong)(zhong)機上(shang)的(de)(de)布(bu)置(zhi)(zhi)(zhi)應(ying)(ying)避免吊重(zhong)(zhong)在(zai)升降過(guo)程中的(de)(de)撞擊。少數(shu)起(qi)(qi)重(zhong)(zhong)機采用(yong)了由電(dian)(dian)(dian)纜(lan)小車(che)(che)將電(dian)(dian)(dian)纜(lan)吊掛在(zai)支(zhi)承架上(shang)的(de)(de)設計(ji),它占用(yong)的(de)(de)地面(mian)(mian)(mian)面(mian)(mian)(mian)積(ji)大(da)(da),不是可以廣泛應(ying)(ying)用(yong)的(de)(de)方(fang)案。
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