我厂一台XS-ZY-1000A塑料注射机在使用近两年后突然出现锁模增压无力的故障。慢速闭模、开模动作极为缓慢,虽有增压动作但达不到使用要求。经检查,其液压回路的有关液压元件均完好。拆卸液压顶出缸时,发现活塞锁紧螺母已松动且无防松装置;活塞左端磨损严重;油缸顶出(左)端研伤长达60mm,深达1.5～2mm; I plant a XS-ZY-1000A plastic injection machine in the past two years after the sudden emergence of clamping pressure booster failure. Slow closing mold, mold opening action is very slow, although the booster action but can not meet the requirements. After inspection, the hydraulic circuit of the hydraulic components are intact. Removal of hydraulic ejection cylinder, the piston lock nut has been found loose and loose device; piston left serious wear and tear; cylinder top (left) end of the injury up to 60mm, up to 1.5 ~ 2mm;