上载(zai)(zai)车(che)板(ban)(ban)(ban)上装(zhuang)有上下(xia)(xia)行(xing)程极(ji)限(xian)(xian)开(kai)关(guan)(guan)和防坠(zhui)落(luo)安(an)全装(zhuang)置(zhi)(zhi)。防坠(zhui)落(luo)安(an)全装(zhuang)置(zhi)(zhi)装(zhuang)在纵(zong)梁与上载(zai)(zai)车(che)板(ban)(ban)(ban)上停(ting)位(wei)之(zhi)间，在纵(zong)梁两(liang)测(ce)各装(zhuang)两(liang)只挂钩(gou)，上载(zai)(zai)车(che)板(ban)(ban)(ban)两(liang)侧相应(ying)位(wei)置(zhi)(zhi)处各装(zhuang)两(liang)只耳(er)环，当上载(zai)(zai)车(che)板(ban)(ban)(ban)上升(sheng)到位(wei)后，纵(zong)梁下(xia)(xia)面的(de)四只挂钩(gou)便自动套入(ru)四只耳(er)环内，以(yi)防止(zhi)(zhi)升(sheng)降电机(ji)常闭(bi)制(zhi)动器(qi)慢(man)释放后，上载(zai)(zai)车(che)板(ban)(ban)(ban)在汽车(che)和载(zai)(zai)车(che)板(ban)(ban)(ban)本身的(de)重(zhong)力作(zuo)用(yong)下(xia)(xia)慢(man)慢(man)下(xia)(xia)滑，压坏下(xia)(xia)层汽车(che)。另外也(ye)防止(zhi)(zhi)制(zhi)动器(qi)一旦(dan)失灵(ling)，上载(zai)(zai)车(che)板(ban)(ban)(ban)从上停(ting)车(che)位(wei)坠(zhui)落(luo)，砸坏下(xia)(xia)层汽车(che)。下(xia)(xia)载(zai)(zai)车(che)板(ban)(ban)(ban)的(de)安(an)全 装(zhuang)置(zhi)(zhi)主要是(shi)(shi)行(xing)程极(ji)限(xian)(xian)开(kai)关(guan)(guan)和防碰(peng)撞(zhuang)板(ban)(ban)(ban)。行(xing)程极(ji)限(xian)(xian)开(kai)关(guan)(guan)的(de)作(zuo)用(yong)是(shi)(shi)使载(zai)(zai)车(che)板(ban)(ban)(ban)横移(yi)到位(wei)后自动停(ting)止(zhi)(zhi)。防碰(peng)撞(zhuang)板(ban)(ban)(ban)的(de)作(zuo)用(yong)是(shi)(shi)：下(xia)(xia)载(zai)(zai)车(che)板(ban)(ban)(ban)横移(yi)时，如果碰(peng)撞(zhuang)到人、遗留行(xing)李(li)或车(che)主宠物时，切(qie)断(duan)横移(yi)电机(ji)电源(yuan)，横移(yi)停(ting)止(zhi)(zhi)。

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