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    儲煤機械 1 火電廠常用的煤場設備有哪些? 答:有懸臂式斗輪堆取料機、門式滾輪堆取料機、裝卸橋、推煤機和儲煤罐等。

    來源:未知 閱讀次數:
       儲煤機械
    1   火電廠常用的煤場設備有哪些?
       答:有懸臂式斗輪堆取料機、門式滾輪堆取料機、裝卸橋、推煤機和儲煤罐等。
    2   懸臂式斗輪堆取料機的主要結構有哪些?
       答:(1)金屬構架。           (2)進料皮帶機。      (3)尾車。  
           (4)懸臂皮帶機。         (5)懸臂俯仰機構。    (6)回轉機構。
    (7)斗輪及斗輪驅動裝置。 (8)大車行走機構。    (9)操作室。    
    (10)夾軌自動裝置。      (11)受電裝置。       (12)液壓系統。
    3   斗輪堆取料機的行走機構有何特點?
    答:斗輪堆取料機的行走機構是有兩臺驅動臺車和兩臺從動臺車組成。驅動臺車上裝有雙速電機,電動機啟動,通過三級立式減速機帶動主動車輪運轉,主動輪通過齒輪帶動兩行走輪同時轉動,從而整機在軌道上前后行走。斗輪堆取料機在空車來回調車時,空車行走速度可達30m/min,在取料作業時行走速度為5m/min。
    4   斗輪堆取料機的堆料和取料各有幾種方式?
       答:堆料作業有三種方式:回轉堆料、定點堆料和行走堆料。
           取料作業有三種方式:斜坡層次取料法、水平全層取料法和連續行走取料法。
    5   斗輪堆取料機的懸臂俯仰機構又稱什么?其作用是什么?
       答:斗輪堆取料機的懸臂俯仰機構又稱為變幅機構,它的作用是實現前臂架的俯仰運動,調節取料時斗輪的取料高度以及堆料時物料的落差。
    6   何謂定點堆料法?
    答:堆料時斗輪堆取料機的臂架固定在某一角度和高度,來煤通過進料皮帶機或尾車進入懸臂皮帶,通過懸臂皮帶機將煤堆入煤場,待煤堆到要求高度時,臂架回轉到另一角度或開動大車到另一點堆料,以此類推。
    7   何謂斜坡層次取料法?
    答:斜坡層次取料法就是斗輪沿煤堆的自然堆積角由上而下地分層挖取。臂架每回 轉一個工作角度,大車向后退一段距離,同時斗輪下降一個斗輪半徑2.5m的高度,然后臂架向反方向回轉,以此類推。當取料達到要求的取料深度后,行走機構再向前進同時大臂上升,進行第二層斜坡取料。
    8   火電廠的儲煤方式有哪幾種?
       答:有露天煤場儲煤、干煤棚儲煤、儲煤溝儲煤和儲煤罐儲煤等。
    9   斗輪堆取料機輪體按結構形式分為哪幾種?
       答:分為全格式、半格式、無格式三種輪體。
    10  斗輪堆取料機斗輪的特點是什么?
    答:斗輪采用半格式結構,半格式斗輪在煤場作業中運行平穩、效率高、卸料好。斗輪的邊緣均焊有耐磨的齒牙,可以在冬季破碎煤堆表面不大于100mm的煤層取煤。
    11  斗輪堆取料機的控制主要包括哪些內容?
        答:斗輪堆取料機的控制主要包括以下幾個部分:
    (1)尾車升降的控制;(2)堆取料控制;    (3)變幅控制; 
    (4)回轉控制;      (5)行走控制;       (6)與主皮帶聯鎖控制。
    12  斗輪堆取料機上最常用的供電方式有哪些?
       答:最常用的供電方式分為兩大類:即硬滑線供電和軟電纜供電。硬滑線供電又分為鋼質滑線和銅質滑線兩種;軟電纜供電又可分為拖動式、懸掛式、拖線車式和卷筒式。
    13  斗輪機自動夾軌裝置的工作原理是什么?
    答:斗輪機自動夾軌裝是由操縱室上的風速儀與自動夾軌器組成。當風速超過允許風速時,風速儀與控制儀表相接通,使夾軌器自動動作夾住軌道,防止在刮大風時設備沿軌道滑移,此時(除6kv電源外),全部電源中斷停機。
    14  斗輪機電氣系統中保護性的聯鎖回路主要有哪些?
    答:(1)夾軌器保護裝置不完全松開時,整個控制回路電源不通,所有機構均不能啟動;
             (2)輪斗過載保護;                           (3)電機過熱保護;
             (4)防撞:若受異物撞碰而切斷電源,停止運行;(5)油路保護回路。
    15  懸臂式斗輪堆取料機除塵系統的噴水點的位置在哪兒?
    答:其噴水點共有三處,分別位于尾車頭部漏斗、懸臂皮帶機頭部落料點及落煤點      
    底部。
    16  斗輪堆取料機落煤裝置由哪幾部分組成?
        答:落煤裝置由落煤斗、料斗、導料槽、斗蓋及支架、電動推桿、煤擋板等組成。煤擋板由電動推桿控制以實現堆、取料工況。
    17 懸臂式斗輪堆取料機回轉支承裝置主要承受哪些力矩?其根據結構形式分為哪幾類?
    答:懸臂式斗輪堆取料機回轉支承裝置主要承受垂直力、水平力和傾覆力矩。根據結構型式可分為兩大類:即滾動軸承式和臺車式兩大類回轉支承裝置。
    18  懸臂式斗輪堆取料機減速器中的齒輪和軸承采用哪幾種方式潤滑?
    答:(1)甩油盤潤滑:讓甩油盤浸在油池中,當甩油盤轉動時把油濺入上方潤滑齒輪。
             (2)浸油潤滑:將齒輪或其它輔助零件浸入減速器油池內。當其轉動時,將潤滑油濺到齒輪嚙合處,一部分油通過油溝流入軸承進行潤滑。
             (3)輕載開式齒輪、銷輪、鏈輪、齒輪聯軸器采用干潤滑。
    19  斗輪機的配重分為哪幾部分?
    答:配重一般分為兩部分:一部分為死配重、放在門柱后部箱內;另一部分為活配重,放在平衡架尾部,活配重隨懸臂變化而變化,從而實現平衡。
    20  斗輪堆取料機取料作業時的最佳回轉角度是多少?為什么?
    答:斗輪堆取料機取料時的回轉角度推薦控制在60°范圍以內(即臂架與軌道中心夾角)為最佳。因為隨著臂架的回轉,斗輪切割物料的俯視投影截面為一月牙形,在回轉速度不變的情況下,斗中的物料逐漸隨月牙而減少。所以控制在60°以內時,取煤量最均勻。 
    21  簡述斗輪機的錨定裝置的作用及使用條件?
    答:斗輪機的錨定裝置是一種預防性裝置,在設備不使用時開到料場設有錨定坑的位置將整機固定。錨定的插板強度應滿足最大的非工作風壓的要求,在錨定裝置上設有限位開關與整機聯鎖,使錨定裝置處于錨定狀態下不能啟動整機的行走機構。錨定裝置一般在事先有大風預報或有較長停機時間時使用。
    22  斗輪機的液壓式變幅機構由哪幾部分組成?其原理是什么?                                      
        答:液壓變幅機構由兩個雙作用油缸組成。
           工作原理:是通過兩個雙作用油缸推動門柱,門柱帶動其上整個機構同時變幅。液壓系統有過載保護設施等。
    23  機械傳動與液壓傳動相比有何優缺點?
    答:液壓傳動容易實現無級調速和過載保護,但對使用維護人員的技術水平要求較高。機械傳動最大的優點是故障診斷容易,但其它性能遠不如液壓傳動。
    24  在斗輪機司機室內的操縱臺上可實現斗輪機的哪些控制?
    答:可實現斗輪機的大車行走、變幅控制、回轉控制、皮帶控制、夾軌控制、除塵控制、推桿控制、照明控制等。
    25  懸臂式斗輪堆取料機防塵系統的供水方式有哪幾種?
        答:有機上備水箱式、地面水箱式、壓力水直接上機式和水管卷筒式等。
    26  簡述斗輪機構的結構、作用及其工作過程?
    答:結構:斗輪機構由輪體、斗子、溜料板、圓弧擋板、驅動裝置、斗輪軸及軸承座等部分組成。
            作用:斗輪機構是斗輪挖掘物料的裝置。
            工作過程:斗輪機構位于斗輪臂架的前端,工作時,驅動裝置驅動斗輪轉動,斗輪切入料堆挖取物料。斗子中的物料由旋轉的斗輪提升,經過圓弧擋板進入料區,物料靠自重經溜料板落到懸臂皮帶機上被運走。
    27  斗輪堆取料機上裝設的安全保護裝置有哪些?
        答:(1)夾軌器與行走電機有聯鎖保護;  (2)回轉機構限位開關;
            (3)變幅機構限位開關;             (4)皮帶聯鎖裝置保護;
            (5)輪斗過載保護;                 (6)終端限位保護;
            (7)5.5 米限位開關;               (8)尾車升降限位保護;
            (9)在油系統中設有堵油保護;       (10)各開關設有零位保護;
             (11)過電流保護及熱保護。
    28  斗輪堆取料機停機后的檢查內容有哪些?
        答:(1)應將懸臂歸正,將回轉及變幅開關扳到零位;
            (2)大車應在適當位置停車,打上夾軌器,切斷總電源開關;
            (3)對設備全面檢查,發現問題及缺陷及時匯報、記錄;
            (4)檢查設備各部位衛生并清掃。
    29  斗輪堆取料機交接班試車項目有哪些?
        答:(1)試驗回轉機構應轉動正常,限位開關動作可靠;
            (2)試驗變幅升降正常,限位開關動作可靠;
            (3)試運大車行走機構、主尾車掛鉤完好,行走正常,拖線電纜無卡掛現象;
            (4)試驗懸臂皮帶機應轉動正常;
            (5)試驗斗輪機構應轉動正常;
            (6)各液壓油泵、油馬達無振動超限、無異音,各壓力表指示正常;
            (7)試驗主皮帶與斗輪機間的限位聯鎖要正常;
            (8)試驗夾軌器動作可靠;
            (9)試驗主分開關零位保護應正常。
    30  懸臂式斗輪堆取料機在運行時應檢查哪些項目?
    答:(1)皮帶是否跑偏及是否有異物卡住或刮破皮帶,各下煤筒是否堵煤或異物卡住,特別是冬季要特別注意大的凍煤塊堵塞下煤筒;
            (2)電動機、油泵、減速機及各軸承溫度是否正常,有無振動及聲音是否正常;
            (3)各液壓部件是否漏油,油路系統有無振動及異常響聲,壓力是否正常;
            (4)夾軌鉗、各抱閘是否動作可靠,回轉、俯仰角度是否合適,限位是否正確動作等。
    31  斗輪在運行中突然自動停止主要有哪些原因?
        答:(1)變量油泵壓力低;              (2)斗輪吃煤過深,使溢流閥溢油;
            (3)壓環打滑;                    (4)機械驅動偶合器打滑或噴油;
            (5)反力矩臂保護動作,煤里有大塊。
    32  斗輪堆取料機的行走機構出現啃軌的原因有哪些?
        答:(1)兩主動輪直徑不相等,大車線速度不等,有可能致使車體傾斜;
            (2)傳動系統偏差過大;
            (3)軌道安裝誤差過大;
            (4)軌道頂面有油污或冰霜。
    33  斗輪堆取料機制動器滑行距離大的原因有哪些?
        答:(1)制動瓦磨損;
            (2)液力推動器運行不靈活;
            (3)潤滑油滴入制動輪的制動面上。
    34  當斗輪機的輪斗被物料埋住時應如何處理?
    答:當發生物料將輪斗埋住時,嚴禁升起變幅機構。此時,應將主機后退,使斗輪從物料中拉出或人工將斗輪挖出后,才能啟動斗輪進行取料作業。
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