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    泵車泵缸反向沖擊力過大會增加動力損失
    時間:2019-08-21 11:36 點擊:
      如果泵車泵送混凝土,如果泵缸反向沖擊力過大,則五種常見危害是不可避免的:
      一是造成泵臂振動并影響其使用壽命; 
      另一種是使吊桿端部軟管擺動增加,這很容易傷害操作員; 
      三是容易導致主液壓泵吸入并影響其使用壽命; 四是增加動力損失,增加油耗; 五是增加噪音,給環境帶來不利影響。 由于問題已經出現,我們須全力以赴尋找解決問題的方法,而不是對它視而不見,我們不能袖手旁觀。
      在混凝土泵車的液壓系統中,A和B端口分別連接到兩個泵送缸的入口和出口腔室,并且主泵交替地將來自A和B端口的高壓油輸送到兩個泵送泵。 泵車泵缸有高壓油進入桿腔,當活塞桿縮回時,右泵缸沒有桿腔壓力油。 高壓油管在沒有桿腔的情況下進入左泵缸,并驅動左泵缸活塞桿延伸。
      當接近開關檢測到右泵缸活塞桿***位時,控制系統發出換向信號。 在主泵接收到反向信號之后,左泵送缸連接有桿室壓力油以縮回左泵缸活塞桿。 左泵缸沒有桿腔壓力油,通過高壓油管進入右泵缸無桿室,驅動右泵缸活塞桿伸出。 兩個泵送缸交替運行以完成混凝土泵送工作。
      泵筒反轉沖擊試驗:
      根據以上原理分析,作者設計了以下四種影響測試程序:
      首先,在泵車泵缸上設置三個1.5mm的直徑孔,并且SN閥安裝在液壓系統中。 此時,泵送缸反轉時的沖擊壓力為14MPa,低壓端吸入時間為70ms。 安裝了SN閥的泵液壓系統所示。
      二是將泵筒上直徑為1.5mm的三個阻尼孔改為一個直徑為1mm的阻尼孔。 此時,測量換向時的沖擊壓力為7MPa。 當泵缸緩沖器關閉時,泵送缸在換向期間幾乎沒有沖擊和吸力。
      三是改進措施根據以上試驗結果,采取以下三種改進措施:一是將SN閥加入泵車泵送液壓系統,降低系統沖擊壓力,減少主泵的吸力; 二是減小泵缸上的減油孔的直徑。 為了減少抽氣缸產生的反向沖擊力; 三是采用無桿腔進油方式的抽油缸,進一步降低抽油缸的換向沖擊力。
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