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uploads/coal cutting.jpg

coal cutting 采[截]煤。

coal drop

The frozen coal destruction is the tension stress destroys , and establish the frozen coal cutting model in this foundation , obtains the cutting force , feeding force , tooth spacing according to the smallest energy principle . bring forward a rotary drilling mothod to unload the frozen coal , the broken ability is strong , without frozen depth limits , then obtains this machine working parameters , has combined this method with a grab and determined the plane of vehicle - carried rotary drilling movable coal - unloader 凍煤破壞是拉應力破壞,在此基礎上建立了凍煤的切削模型,根據最小能量原理得到截割力,進給力和截齒間距的計算公式,分析得到截割力與切削厚度成正比,隨著前角的增大而減小;截齒最優截距與截齒尺寸有關且與切屑厚度成正比;進給力隨著截齒前角增大而增大的規律。

Abstract : because the kinds , structure , storage and stratification of coal are different , it is difficult to analyze the effect factor on coal cutting power . based on a lot tests , the change rule of cutting parameter with cutting power is discussed , it is an important basis for designing , researching and selecting mining equipment , prcessing and technical reform 文摘:由于煤炭的種類、結構、賦存和層理的不同,給分析影響煤炭切削力因素帶來了困難,在大量實驗的基礎上,討論了切削力隨切削參數的變化規律,為設計、研究、選擇采掘設備、開采工藝、技術改造提供了重要依據。

The results indicate that a stable deformation localization band occurs in the coal cutting course and develops to macroscopic crack ; the deformation localization band is slantwise ; while the cutter tooth is used , the deformation localization develops slowly , and the localization becomes wider and the strain value in the band area higher afterwards ; when the point - attack pick used the localization develops quickly and the localization band becomes narrow and the strain value in the band lower 研究表明:截齒截割煤體過程中,煤體出現穩定的變形局部化帶,且最終發展為宏觀裂紋;煤體變形局部化帶為一個傾斜帶:刀齒截割時,變形局部化發展較慢,但產生變形局部化后,局部化帶寬且帶內應變值較高;而鎬齒截割時,變形局部化發展較快,但產生局部化后,局部化帶窄且帶內應變值不如刀齒高。

Because the kinds , structure , storage and stratification of coal are different , it is difficult to analyze the effect factor on coal cutting power . based on a lot tests , the change rule of cutting parameter with cutting power is discussed , it is an important basis for designing , researching and selecting mining equipment , prcessing and technical reform 由于煤炭的種類、結構、賦存和層理的不同,給分析影響煤炭切削力因素帶來了困難,在大量實驗的基礎上,討論了切削力隨切削參數的變化規律,為設計、研究、選擇采掘設備、開采工藝、技術改造提供了重要依據。

An improved mode of coal cutting is recommended aiming at the specifical status of surface collapse of coal field in yanzhou city , and several control policies on restoration and reclamation of collapsing land are also put forward 針對兗州礦區的具體塌陷狀況提出了改進采煤方式、對塌陷土地進行恢復和復墾等幾點防治措施。

Drill bit for coal cutting 電煤鉆頭