目前各采煤国家广泛使用的螺旋滚筒式采煤机具有很多优点,其中最关键的是工作机构可实现截煤和装煤于一体,并且具有较高的生产率.它的主要缺点是块煤率低及工作面粉尘较大,块煤率低不仅增加了截割的能耗而且也降低了吨煤售价,直接影响...目前各采煤国家广泛使用的螺旋滚筒式采煤机具有很多优点,其中最关键的是工作机构可实现截煤和装煤于一体,并且具有较高的生产率.它的主要缺点是块煤率低及工作面粉尘较大,块煤率低不仅增加了截割的能耗而且也降低了吨煤售价,直接影响着经济效益,据晋城矿区的调查,炮采改为机采后,块煤率下降10%以上,而吨煤的销售价差约12元,对于一个年产量200万 t 的矿井,如果有40%的炮采产量改为机采,每年仅此一项该矿的利润就降低1000万元。所以世界各主要产煤国家都在进行滚筒的研究与改进。展开更多
The expected annual costs of loading operation of a coal tipple are ana-lyzed, and the loading of the trains and some factors in the system are studied. Sineethe arrival of the trains is uncertain, 3 probability model...The expected annual costs of loading operation of a coal tipple are ana-lyzed, and the loading of the trains and some factors in the system are studied. Sineethe arrival of the trains is uncertain, 3 probability models , uniform, normal and betadistributions,are used to simulate the arrival of the trains. With the aid of comput-er,the annual costs of the 3 distributions are found to be 103. 99 , 79. 09 and 72. 86million dollars, respectively. The trend is obvious. With the fixed arriving time ofthe standard trains,a plan is made manually. It shows that the cost is only 51. 33million, which is of the minimized value. We also set some principles in analyzingthe problem. They will be useful for some plan of a railroad system.展开更多
文摘目前各采煤国家广泛使用的螺旋滚筒式采煤机具有很多优点,其中最关键的是工作机构可实现截煤和装煤于一体,并且具有较高的生产率.它的主要缺点是块煤率低及工作面粉尘较大,块煤率低不仅增加了截割的能耗而且也降低了吨煤售价,直接影响着经济效益,据晋城矿区的调查,炮采改为机采后,块煤率下降10%以上,而吨煤的销售价差约12元,对于一个年产量200万 t 的矿井,如果有40%的炮采产量改为机采,每年仅此一项该矿的利润就降低1000万元。所以世界各主要产煤国家都在进行滚筒的研究与改进。
文摘The expected annual costs of loading operation of a coal tipple are ana-lyzed, and the loading of the trains and some factors in the system are studied. Sineethe arrival of the trains is uncertain, 3 probability models , uniform, normal and betadistributions,are used to simulate the arrival of the trains. With the aid of comput-er,the annual costs of the 3 distributions are found to be 103. 99 , 79. 09 and 72. 86million dollars, respectively. The trend is obvious. With the fixed arriving time ofthe standard trains,a plan is made manually. It shows that the cost is only 51. 33million, which is of the minimized value. We also set some principles in analyzingthe problem. They will be useful for some plan of a railroad system.
