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我厂支架分厂大修常村矿ＺＰＹ３２００－１７／３５型掩护支撑式液压支架时（大修周期１２～１８个月，配套操作阀为ＣＦ－ＰＺ２００－４００），发现有１０％的支架不能降落或降落缓慢（３０ｍｉｎ左右），检查支架管路与主柱等均完好。据反映，在井下使用时也有这种现象发?
I plant plant overhaul branch repair Chang Village mine ZPY3200-17 / 35 type shield support type hydraulic support (overhaul period of 12 to 18 months, supporting the operation of the valve for the CF-PZ200-400) and found that 10% of the stent can not be landed or Landing slowly (30min or so), check the stent pipeline and the main column are intact. It is reported that this phenomenon is also used when used downhole?