山东裕隆矿业集团有限公司单家村煤矿是一座年设计能力为45万t的中型矿井,该矿现有职工2000人。矿井采用走向长壁后退式开采方式,采面支护采用DZ-25(22)型单体液压支柱,目前全矿单体支柱数量已达1万多根。由于工作环境恶劣,且长期使用,致使液压支柱缸体内腔等部位严重锈蚀,损坏 Shandong Yulong Mining Group Co., Ltd. Shanjialu Coal Mine is a mid-sized mine with annual design capacity of 450,000 t. The mine currently employs 2,000 people. The mine adopts the backward mining mode that goes to the longwall. The support of the mining face adopts DZ-25 (22) type single hydraulic props. At present, the number of single props in the whole mine has reached over 10,000. Due to poor working conditions, and long-term use, resulting in hydraulic prop cylinder block and other parts of the serious corrosion, damage