雙塔俯仰式纜機(jī)英文文獻(xiàn)翻譯-預(yù)覽頁
【正文】 finitely variable speed regulation. For physics reasons he acceleration shouldn39。s Republic of China. The cable cranes, representing the main transport facility of a dam construction jobsite, have been designed for the purpose of transporting concrete, formwork items, concrete prefabitems, reinforcing material, building machinery and machine ponents such as penstocks, generators, lock gates, etc. . The cable cranes that will be used on the jobsite are of the luffing type, i. e. it has been given that name because for moving the track rope, the towers or masts one have to luff to the upstream or downstream direction. Both the slewing masts of each single crane between which the track ropes are installed, are situated at an elevation of + 185 m on block 8 already concreted on the left bank and on the longitudinal coffer dam at the elevation of + 160 m. Each mast has a height of 125 + 25 = 150m, and is firmly anchored by rear stay ropes in longitudinal direction. On their sides, the masts are held respectively moved by 6strand luffing ropes actuated by winches. The spans are: Rear stay ropes on the left bank approx. 270m Rear stay ropes on the right bank approx. . Track ropes: approx. 1416m The machine houses for the winches of the cranes are arranged on the foot of the masts. In the machine houses on the foot of the head towers are arranged the winches for hoisting crab traversing and mast luffing. In the machine houses on the foot of the tail towers are only situated the winches for mast luffing . This machine houses are therefore called luffing winch house . The control electronics are each located in separate rooms, for thus avoiding any problems as might occur by dust or also temperature variations. There are three possibilities to control the winches. Normally the crane is controlled by the driver39。an uniform running in the two grooves (see chapter Maintenance). Between the two grooves` the crab traversing rope is led over the return pulley。將要在工地使用的纜索起重機(jī)屬仰俯式，也就是說，它之所以被稱為仰俯式是因?yàn)橐苿优芩鲿r，起重塔或起重桅桿必須向上游或下游仰俯。 首塔腳下的機(jī)房內(nèi)裝有控制纜車橫向移動和起重塔桿仰俯用的絞盤。 有三種可能的方法來控制絞盤。 第三種方法是在機(jī)構(gòu)附近來控制起重，纜車橫移和仰俯，就是控制裝置便于調(diào)節(jié)和修理。由于物理原因，加速不應(yīng)大幅度超過 ,各自的路徑約為 在 12s 后停止，另外用機(jī)械制動時，由于制動負(fù)荷的 不同還會導(dǎo)致更短的制動時間。由于這些開關(guān)不可能從設(shè)定的位置上移走，故信號是絕對的。運(yùn)行小時計數(shù)器監(jiān)測纜車橫移馬達(dá)目前工作的時間，工作循環(huán)計數(shù)器監(jiān)測橫移運(yùn)行的次數(shù)。 工作循環(huán)計數(shù)器是維護(hù)人員的好幫手，使得他們更好的了解橫移纜索，起重纜索，纜索托輪，驅(qū)動卷筒內(nèi)套等各種磨損件的工作壽命。安裝好后 ,對限位開關(guān)進(jìn)行設(shè)置，以保證纜車能在到達(dá)塔機(jī)前 130m 時停止或在到達(dá)計數(shù)器前 110m 時停止。在此范圍內(nèi)朝相反的方向行駛時，沒有速度限制。 跑索終端的各個限位開關(guān)通過電動方式最終停止纜車橫移。為此目的，必須將纜車行進(jìn)到纜機(jī)駕駛員數(shù)悉的位置，并且知道從這個位置到跑索兩端的準(zhǔn)確的距離。在整個同步過程中必須按住按鈕不放。為此在驅(qū)動滑輪和返程滑輪的軸臺上安裝定位螺桿。不同的槽深也就意味著不同的圓周速度，這必定會導(dǎo)致更大的纜索滑動，因此對內(nèi)套的磨損更大。之所以要更換，是因?yàn)椴鄣目偵疃戎挥?40mm,內(nèi)套的
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