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【正文】 根據模型的約束條件，半滾筒截割的產量最高；在相同的工作面長度的情況下 ,雙方向的截割方法比單方向的截割方法生產率高。 在論文中，通過選擇不同的截割次序的采礦方法在生產力上所取得的成功產生深遠影響。 因為這一個原因 ,如此一項詳細長壁采煤發(fā)的潛在可行性分析被認識合理的。制約牽引速度的唯一因素是甲板輸送機 ,切割電動機和牽引電動機相互獨立。 該模型實用于煤層厚度在 2 m 和 5 m 之間以 50cm為一個等級的被稱之為厚煤層的煤礦類型 ,根據不同的等級選擇不同的設備，可以在市場上選擇最適合該等級開采的設備。滾筒截割在煤層的中間部位不會產生無效的截割時間。除了實現較高的牽引速度，在甲板輸送機被的采煤機雙向循環(huán)的煤流而平衡。此外煤流可能是相當不規(guī)則，它依賴于采煤機在截割周期中的位置。 在回返行程中，地板煤是被采煤機底板它本身清理。滾筒的前端面截割煤層的頂部而滾筒的后端面截割煤層的下部，同時起到清除落煤的作用。區(qū)分截割工藝的以前那些參數就可以把不同的截割方式區(qū)分。第二，根據截割次序，在到達工作面尾部 , 預先在選取一個等價的線切斷網 ,是區(qū)分截割方法的一個獨立的參數。 煤送入甲板輸送機之上正如采煤機截割，是采煤中的另外一個問題 ,尤其是在截齒上受到的屈服應力和疲勞應力。 根據采煤的產量，不同采煤機截割的方法可以通過一個標準化方法繪制產量圖來反映不同截割方法的優(yōu)劣。 然而提到應用在采煤上根據特殊情況而改變切割的方法 ,–用煤層高度和設備的使用來舉例說明 ,論文系統(tǒng)地論述通過從不同的角度采取不同的方法。除了這兩種主要的方法，交替循環(huán)采煤也已經應用在地下的硬煤層 開采中，它被成功地推廣在全世界的挖掘過程中?，F在趨向于 更大和更好 的儀器和裝備，然而這種趨勢在技術上和費用上的可行性已經達到極限。 therefore, general solutions do not guarantee optimal efficiency and productivity. A categorization of shearer loader cutting sequences is realised by four major parameters . Firstly, one can separate between mining methods, which mine coal in two directions – meaning from the head to the tailgate and on the return run as well – or in one direction only. Secondly, the way the mining sequence deals with the situation at the face ends, to advance face line after extracting the equivalent of a cutting web, is a characteristic parameter for each separate method. The necessary travel distance while sumping varies between the sequences, as does the time needed to perform this task, too. Another aspect defining the sequences is the proportion of the web cutting coal per run. Whereas traditionally the full web was used, the introduction of moder n AFC and roof support automation control systems allows for efficient operations using half web methods. The forth parameter identifying state of the art shearer loader cutting sequences is the opening created per run. Other than the partial or halfopening method like those used in Matla’s “OptiCycle”, the cutting height is equal to the plete seam height including partings and soft hanging or footwall material. Bidirectional cutting sequence The bidirectional cutting sequence, depicted in Figure 1a, is characterised by two sumping operations at the face ends in a plete cycle, which is acplished during both the forward and return trip. The whole longwall face advances each plete cycle at the equivalent of two web distances by the pletion of each cycle. The leading drum of the shearer cuts the upper part of the seam while the rear drum cuts the bottom coal and cleans the floor coal. The main disadvantages of this cutting method are thought to be the unproductive time resulting from the face end activities and the plex operation. Therefore, the trend in recent years was to increase face length to reduce the relative impact of sumping in favour of longer production time. Unidirectional cutting sequence In contrast to the bidirectional method, the shearer loader cuts the coal in one single direction when in unidirectional mode. On the
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