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    機 械 基 礎 1 什么叫潤滑? 答:在有相對運動的兩個摩擦面之間加入潤滑劑(如潤滑油),以達到減少摩擦和磨損,這種工藝措施叫潤滑。

    來源:未知 閱讀次數:
         
    1   什么叫潤滑?
       答:在有相對運動的兩個摩擦面之間加入潤滑劑(如潤滑油),以達到減少摩擦和磨損,這種工藝措施叫潤滑。
    2   潤滑的作用是什么?
       答:潤滑對機械的正常運轉及維護保養起重要作用,它可以控制摩擦、減少磨損、降溫冷卻、防止摩擦面銹蝕,又起密封傳遞動力、減少振動等作用。
    3   潤滑管理的“五定”包括哪些內容?
       答:(1)定質:按照設備潤滑規定的油種加油、加脂,換油清洗時要保證清洗質量,設備上各種潤滑裝置要完善,使用器具要保持清潔。
           (2)定量:按規定的數量加油、加脂。
           (3)定點:確定設備需要潤滑的部位和潤滑點。
           (4)定期:按規定的時間加油、加脂。
           (5)定人:按規定的潤滑部位和潤滑點,指定專人負責
    4   影響機件磨損的因素有哪些?
       答:影響機件磨損的因素很多,既有機件內部因素,又有機件的外部因素。主要因素有:機件磨損面的材料、表面加工質量、機件工作條件、潤滑質量、裝配質量和維護保養等。
    5   軸承的功用是什么?
       答:軸承是用來支承軸及繞軸轉動的機械零部件,并保證旋轉精度。
    6   軸承按工作面的摩擦性質不同可分為哪兩類?
       答:  可分為滾動軸承和滑動軸承。
    7   軸承按其承載性質不同可分為哪幾種類型?各承受何種載荷?
       答:按其承載性質不同可分向心軸承、推力軸承和向心推力軸承。 向心軸承只承受徑向載荷。推力軸承只承受軸向載荷。向心推力軸承即能承受徑向載荷又能承受軸向載荷。
    8  滾動軸承有哪些部件組成?其承載能力與哪些因素有關?
       答:滾動軸承由外圈、內圈、滾動體和保持架組成。其承載能力與滾動體的大小、       
    9   聯軸器的主要形式有哪些?
       答:主要有液力偶合器、十字滑塊聯軸器、銷軸聯軸器。
    10  機械的傳動方式主要有哪些?
       答:主要有齒輪減速器傳動、液壓傳動、帶傳動、鏈傳動等。
    11   什么是液壓傳動?
       答:凡是以液體為工作介質來實現機械能傳遞的,均叫液壓傳動。
    12  運行中滾動軸承、滑動軸承、減速器的最高溫度各是多少?
       答:運行中滾動軸承的最高允許溫度為80°C,滑動軸承的最高允許溫度為60°C,減速器的最高允許溫度為60°C。
    13  對聯軸器應檢查哪些項目?
       答:保護罩應牢固可靠,周圍無可能被絞住的雜物,兩軸聯接件要可靠牢固。運行中應檢查聯軸器要傳動平穩,無過大振動、噪音、無明顯竄軸現象。
    14   滾動軸承潤滑的作用是什么?
       答:其具有冷卻、防銹、防塵等作用。
    15  軸承座按材料分有哪幾種?
       答:有鑄鐵式、鋼板沖壓式及酚醛塑料加布三種。
    16  電動機與減速器之間采用何種形式進行聯接的?減速器與傳動滾筒之
        間的聯接常用的聯軸器是什么?
        答:電動機與減速器之間的聯接常采用尼龍柱銷連軸器。當傳動功較大時,可選用粉末聯軸器。為了改善帶式輸送機的啟動工況,以及雙電動機驅動的長距離帶式輸送機,平衡各電動機的負荷,在新建大中型火電廠,一般采用液力偶合器。減速器與傳動滾筒之間一般采用十字滑塊聯軸器聯接。
    17  工業潤滑脂按稠化劑類型分為哪幾種?
        答:分為鈣基脂、鈉基脂、鋁基脂、鋰基脂、鋇基脂等幾種類型。
    18  滾動軸承添加潤滑脂應注意哪些問題?
       答:(1)軸承里應填滿,但不應超過外蓋以內全部空間的1/2~3/4。
           (2)裝在水平軸上的一個或多個軸承要填滿軸承和軸承間隙,但外蓋里的空隙只填滿全部空間的1/3~3/4。
           (3)裝在垂直軸上的軸承只填滿軸承,但上蓋則只填空間的一半,下蓋只填空間的1/2~3/4。
           (4)在易污染的環境中,對低速或中速軸承要把軸承和蓋內全部空間填滿。
    19  一個完整的液壓系統由哪幾部分組成?
    答:一個完整的液壓系統由動力部分、執行部分、控制部分、工作介質、輔助部分等組成。
    20 摩擦在機械設備的運行中有哪些危害?
        答:其危害總的概括起來有以下幾點:
        (1)消耗大量的功;(2)造成磨損;(3)產生熱量。
    21  根據軸的用途和受力情況,軸可分為哪幾種?
        答:根據軸的用途和受力情況,軸可分為心軸、傳動軸、轉軸等。
    22  根據潤滑的狀態,潤滑可分為哪幾種?
        答:潤滑可分為流體液壓潤滑、彈性流體動壓潤滑、邊界潤滑三種狀態。
    23  減速器缺油會造成哪些不良后果?
    答:減速器缺油后如繼續運轉,將導致齒輪間的干摩擦,使齒輪很快磨損,同時減速器軸承也會因缺油使冷卻條件惡化而超溫損壞,因而導致運行設備停運。
    24  滾動軸承的工作溫度范圍為多少?
       答:滾動軸承的工作溫度范圍為0~80°C。
    25  液壓傳動的類型有哪幾種?
       答:液壓傳動裝置按工作原理可分為動力式和容積式兩種;按液流循環方式的不同,又可分為開式和閉式。
    26.離心泵的工作原理是什么?
      答:利用葉輪旋轉時產生的離心力使工質獲得能量,通過葉輪后其壓能和動能都得到升高,從而能輸送到高出或遠處。葉輪裝在個螺旋形泵殼內,當葉輪旋轉時,工質通過吸入室軸向流入,然后旋轉90o進入葉輪流道并徑向流出,流至泵殼經擴散管排出。由于葉輪連續旋轉,在葉輪入口處不斷形成真空,從而連續不斷的將工質吸入和排除。
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