【摘要】：反井鉆機施工方法自20世紀70年代進入我國起,已在煤礦、水電、交通等行業(yè)工程建設中得到廣泛應用。鑲齒滾刀作為反井鉆機的關鍵性部件和易損耗部件,其破巖效果直接影響著鉆機的鉆進效率和開挖成本,因此對其性能及合理布置進行探討顯得尤為重要。本文利用有限元軟件,模擬了4種(球齒、錐齒、鎬齒1、鎬齒2)齒形的單齒壓入巖石過程和鑲齒滾刀滾壓破巖動態(tài)過程,主要研究內(nèi)容及結論如下:1、模擬了單齒壓入巖石的過程,分析了巖石應力以及不同網(wǎng)格尺寸下對模擬結果的影響,研究了各單齒在不同壓力下的破巖效果。結果表明:(1)侵深和破巖體積均隨壓力增加呈非線性增大。(2)鎬齒的破巖效果最好,錐形齒的破巖效果次之,球齒的破巖效果最差。2、模擬了鑲齒滾刀滾壓破巖的過程,分析了滾刀受力、巖石應力情況以及巖石模型尺寸對模擬結果的影響,研究了巖石抗壓強度、切深、錐齒齒形、刀齒間距以及刀齒排距對滾刀破巖效果的影響。結果表明:(1)巖石抗壓強度越高,破巖比能越高,破巖越困難。(2)巖石的破巖比能隨切深增加,先減少后增大,存在臨界切深,此時破巖比能最小。(3)相同切深下,錐齒滾刀的破巖效果比球齒滾刀好。(4)錐齒的錐頂半徑R增大會導致滾刀力增大,破巖比能減小;錐頂角θ增大會導致滾刀力增大。(5)刀齒間距較大時,破巖比能變化較小,破巖比能總體隨刀齒間距的減小而減小。(6)巖石的破巖比能隨刀齒排距的增加,先減小,后增大。
[Abstract]:Since its entry into China in the 1970s, the construction method of anti-well drilling rig has been widely used in the construction of coal mine, hydropower, traffic and other industries. As the key part and the easy to wear part of the reverse drilling rig, the rock breaking effect has a direct impact on the drilling efficiency and excavation cost of the drilling rig, so it is very important to discuss its performance and reasonable arrangement. In this paper, four kinds of tooth shapes (ball tooth, cone tooth, pick tooth 1, pick tooth 2) are simulated by finite element software. The main research contents and conclusions are as follows: 1. The process of single tooth pressing into rock is simulated, the influence of rock stress and different mesh size on the simulation results is analyzed, and the rock breaking effect of each single tooth under different pressure is studied. The results are as follows: (1) the volume of penetration and rock breaking increase non-linear with the increase of pressure. (2) the rock breaking effect of pick tooth is the best, the rock breaking effect of cone tooth is the second, and the rock breaking effect of ball tooth is the worst. 2. In this paper, the influence of hob force, rock stress and rock model size on the simulation results is analyzed. The influence of rock compressive strength, cutting depth, conical tooth profile, cutter tooth spacing and cutter tooth spacing on the rock breaking effect of the hob is studied. The results show that: (1) the higher the compressive strength of rock, the higher the specific energy of rock breaking, and the more difficult rock breaking is. (2) the specific energy of rock breaking increases with the depth of cutting, decreases first and then increases, and there is a critical cutting depth. (3) under the same cutting depth, the specific energy of rock breaking is the lowest. The rock breaking effect of cone tooth hob is better than that of ball tooth hob. (4) the increase of cone top radius R will lead to the increase of hob force and the decrease of rock breaking specific energy, and the increase of cone top angle 胃 will lead to the increase of hob force. (5) when the tooth spacing of the cutter is larger, the rock breaking ratio energy changes slightly. As a whole, the specific energy of rock breaking decreases with the decrease of cutter tooth spacing. (6) the specific energy of rock breaking decreases first and then increases with the increase of tooth spacing.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD421.3

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