液(Ye)压(Ya)支(Zhi)柱(Zhu)是(Shi)由(You)缸(Gang)体(Ti)、(?)活(Huo)柱(Zhu)、(?)阀(Fa)等(Deng)零(Ling)件(Jian)组(Zu)成(Cheng)的(De)。(?)其(Qi)中(Zhong)三(San)用(Yong)阀(Fa)是(Shi)外(Wai)注(Zhu)式(Shi)液(Ye)压(Ya)支(Zhi)柱(Zhu)的(De)心(Xin)脏(Zang),(?)它(Ta)由(You)单(Dan)向(Xiang)阀(Fa)、(?)卸(Xie)载(Zai)阀(Fa)和(He)安(An)全(Quan)阀(Fa)王(Wang)部(Bu)分(Fen)组(Zu)成(Cheng)。(?)单(Dan)向(Xiang)阀(Fa)供(Gong)液(Ye)压(Ya)支(Zhi)柱(Zhu)供(Gong)液(Ye)用(Yong),(?)卸(Xie)载(Zai)阀(Fa)供(Gong)液(Ye)压(Ya)支(Zhi)柱(Zhu)卸(Xie)载(Zai)回(Hui)柱(Zhu)用(Yong),(?)安(An)全(Quan)阀(Fa)保(Bao)证(Zheng)液(Ye)压(Ya)支(Zhi)柱(Zhu)具(Ju)有(You)恒(Heng)阻(Zu)特(Te)性(Xing)。(?)现(Xian)以(Yi)外(Wai)注(Zhu)式(Shi)单(Dan)体(Ti)液(Ye)压(Ya)为(Wei)例(Li)介(Jie)绍(Shao)其(Qi)结(Jie)构(Gou)和(He)工(Gong)作(Zuo)原(Yuan)理(Li)。(?)
升(Sheng)柱(Zhu)时(Shi),(?)操(Cao)作(Zuo)注(Zhu)液(Ye)枪(Qiang)把(Ba)手(Shou),(?)高(Gao)压(Ya)液(Ye)体(Ti)经(Jing)三(San)用(Yong)阀(Fa)内(Nei)的(De)单(Dan)向(Xiang)阀(Fa)、(?)阀(Fa)筒(Tong)上(Shang)的(De)径(Jing)向(Xiang)孔(Kong)进(Jin)入(Ru)支(Zhi)柱(Zhu)下(Xia)腔(Qiang),(?)活(Huo)柱(Zhu)升(Sheng)高(Gao)。(?)当(Dang)支(Zhi)柱(Zhu)顶(Ding)盖(Gai)使(Shi)金(Jin)属(Shu)顶(Ding)梁(Liang)紧(Jin)贴(Tie)工(Gong)作(Zuo)面(Mian)顶(Ding)板(Ban),(?)活(Huo)柱(Zhu)不(Bu)再(Zai)升(Sheng)高(Gao)时(Shi),(?)松(Song)开(Kai)注(Zhu)液(Ye)枪(Qiang)把(Ba)手(Shou),(?)注(Zhu)液(Ye)枪(Qiang)即(Ji)切(Qie)断(Duan)岛(Dao)压(Ya)液(Ye)流(Liu),(?)这(Zhe)时(Shi)支(Zhi)柱(Zhu)下(Xia)腔(Qiang)压(Ya)力(Li)为(Wei)泵(Beng)站(Zhan)压(Ya)力(Li),(?)使(Shi)支(Zhi)柱(Zhu)给(Gei)予(Yu)顶(Ding)板(Ban)一(Yi)定(Ding)的(De)初(Chu)撑(Cheng)力(Li),(?)完(Wan)成(Cheng)升(Sheng)柱(Zhu)—(?)—(?)初(Chu)撑(Cheng)阶(Jie)段(Duan)。(?)随(Sui)着(Zhuo)支(Zhi)护(Hu)时(Shi)间(Jian)的(De)延(Yan)长(Chang),(?)工(Gong)作(Zuo)面(Mian)顶(Ding)板(Ban)作(Zuo)用(Yong)在(Zai)支(Zhi)柱(Zhu)上(Shang)的(De)载(Zai)荷(He)增(Zeng)加(Jia),(?)当(Dang)顶(Ding)板(Ban)压(Ya)力(Li)超(Chao)过(Guo)支(Zhi)柱(Zhu)额(E)定(Ding)工(Gong)作(Zuo)阻(Zu)力(Li)时(Shi),(?)支(Zhi)柱(Zhu)内(Nei)腔(Qiang)的(De)高(Gao)压(Ya)液(Ye)体(Ti)将(Jiang)三(San)用(Yong)阀(Fa)中(Zhong)的(De)安(An)全(Quan)阀(Fa)打(Da)开(Kai),(?)液(Ye)体(Ti)从(Cong)右(You)阀(Fa)管(Guan)与(Yu)安(An)全(Quan)阀(Fa)套(Tao)之(Zhi)间(Jian)的(De)间(Jian)隙(Xi)外(Wai)溢(Yi),(?)支(Zhi)柱(Zhu)内(Nei)腔(Qiang)压(Ya)力(Li)降(Jiang)低(Di),(?)支(Zhi)柱(Zhu)下(Xia)缩(Suo)。(?)当(Dang)支(Zhi)柱(Zhu)内(Nei)腔(Qiang)压(Ya)力(Li)低(Di)于(Yu)安(An)全(Quan)阀(Fa)弹(Dan)簧(Huang)力(Li)时(Shi),(?)安(An)全(Quan)阀(Fa)关(Guan)闭(Bi),(?)支(Zhi)柱(Zhu)内(Nei)腔(Qiang)压(Ya)力(Li)液(Ye)体(Ti)停(Ting)止(Zhi)外(Wai)溢(Yi),(?)支(Zhi)柱(Zhu)不(Bu)再(Zai)下(Xia)缩(Suo)。(?)