外文翻譯--小動力掘進(jìn)機(jī)在不同巖石面挖掘隧道的實驗結(jié)果

1、中文 中文 4757 字翻譯部分 翻譯部分英文原文AbstractIn this paper, the experimental results of a 45-kW and 15-t roadheader excavating a gallery with two different types of rock at the face using two different cutting heads are shown. It is

2、 proved that the roadheader works properly with both cutting heads. In comparison with other results in the literature, the principal parameters, i.e. specific energy, cutting rate and tool wear, are at a level that can

3、be considered satisfactory taking into account the low power of the roadheader. On the other hand, the influence of the number of picks, which is the main difference between the two cutting heads, on the operational para

4、meters is shown.2003 Elsevier Science Ltd. All rights reserved.Keywords: Roadheaders; Cutting head design; Specific cutting energy; Cutting rate; Tool wear 1. Introduction: experience in using of roadheaders in a mineThe

5、 coal basin in the NW of Spain (Areceset al.,1994) forms a syncline in which the coal seams are moderately inclined (30–358) at the NW fold axis and almost vertical (70–908) at the SE fold axis. Carboniferous material oc

6、curs under a flat Permian overburden,150 m thick.The use of roadheaders in this mine was a consequence of mechanisation of the work. Coal mining by the long-wall method with powered roof supports makes rapid advance of t

7、he access roads necessary. On the other hand, the two alternatives for mining very thick coal seams, i.e. room-and-pillar in flat seams and sublevel caving in vertical seams, also makes the use of roadheader driving gall

8、eries in the coal seams necessary Several types of roadheaders are used in the mine for these different works:a. One roadheader (Fig. 1) of 60 t in weight, with a 250-kW ripping cutting head, especially designed for this

9、 type of mine in the context of research project (Anon., 1991; Torano et al., 1992; Torano, 1994) rock, the torque transmitted by the motor was trans formed to a larger tangential force in the pick, which allows higher -

10、strength rock to be cut. Stress concentration is the major factor in rock fragmentation. The parameters to measure (according to classic studies on this theme; Fowell and McFeat-Smith, 1976;Gehring, 1989) are the cutting

11、 rate (volume of rock excavated per time unit in m3/s), specific energy (ener- 3 gy necessary to excavate a unit of volume in MJ/m3 ) 3 and the tool wear or specific pick consumption (picks or pick mass lost excavating a