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本文讨论怎样用库存论解决露天矿物资库存问题,这个问题具有重要经济意义。石人沟露天矿每年实际物资消耗量进行了A、B、C分类,该矿A+B类物资占总数的41.19％,而占用资金却占资金总额的94.5％,因此,研究的重点为A、B类物资。露天矿物资消耗量是随机变化的,对统计资料进行分析发现:机动科和汽车管理科的备件消耗量80％服从负指数分布,约20％服从正态分布;供销科的物资消耗量服从正态分布。笔者参照国内外经验,根据露天矿实际情况,提出采用[T,Q,ss,S]库存控制方法,指标计算式: 经济订货量 Q~*=(24AD/rc)~(1/2) 订货间隔期 T=(24A/rcD)~(1/2) 安全库存量 ss=K·σ(T十L)D 报警点 S=L_2+Kσ_(DL_2) Q、T用确定型数学模型;ss、S用随机型模型,用拉氏分布求安全系数K值。研究结果说明,露天矿实际平均库存量比合理库存量大得多,近60％的物资超过10倍,个别的超过40倍,这样不能有效利用流动资金,影响经济效益,物资也不能在国内进行合理分配。
This article discusses how to use inventory to solve the inventory of open-pit mineral stocks, this issue has important economic significance. The annual actual consumption of materials in Shirengou Open-pit Mine has been classified as A, B and C respectively. The A + B materials in this mine account for 41.19% of the total, while the occupied funds account for 94.5% of the total. Therefore, the research focuses on A , Class B materials. Open-pit mineral consumption is random changes in the statistical data analysis found that: Motor Division and Automotive Management Section of the spare parts consumption of 80% subject to a negative exponential distribution, about 20% subject to normal distribution; Supply and Demand Division material consumption is subject to positive State distribution. According to the domestic and international experience, according to the actual situation of the opencast mine, the author proposes to adopt [T, Q, ss, S] inventory control method and index calculation formula: Order Quantity Q ~ * = (24AD / rc) Interval T = (24A / rcD) ~ (1/2) safety stock quantity ss = K · σ (T ten L) D alarm point S = L_2 + Kσ_ (DL_2) Q, T with a definite mathematical model; ss , S with a random model, with the distribution of safety factor K value. The results show that the actual average inventory of open-pit mines is much larger than reasonable inventory, nearly 60% of the materials are more than 10 times and more than 40 times of individual ones, which can not effectively use the working capital and affect the economic benefits, and the materials can not be carried domestically Reasonable allocation.