采煤機(jī)滾筒截割破煤理論及截割動(dòng)力學(xué)研究
發(fā)布時(shí)間：2018-11-26 15:37
【摘要】：滾筒式采煤機(jī)是機(jī)械化采煤作業(yè)的主要機(jī)械設(shè)備,在煤礦開采中占有重要地位。研究截齒與煤壁的相互作用規(guī)律,有助于進(jìn)一步研究滾筒的截割性能,繼而改善采煤機(jī)的工作效率、穩(wěn)定性與壽命。有鑒于此,研究不同參數(shù)下截齒對(duì)煤壁的破壞作用與截割性能,對(duì)于螺旋滾筒的優(yōu)化設(shè)計(jì)具有重要的意義。本課題對(duì)截齒與滾筒截割過程進(jìn)行研究,主要包括以下內(nèi)容。首先,基于對(duì)煤壁物理力學(xué)性質(zhì)的了解,借助PFC3D軟件建立了離散元煤壁模型,進(jìn)行單軸抗壓與巴西劈裂模擬試驗(yàn),測(cè)出了模擬煤壁的力學(xué)性質(zhì),使之與真實(shí)煤壁相匹配;隨后,利用UG軟件建立鎬型截齒模型并導(dǎo)入PFC3D,在不同切削厚度下對(duì)該模擬煤壁進(jìn)行直線截割仿真,并利用回歸分析的方法驗(yàn)證了煤壁模型的可靠性。其次,在切削厚度為5 mm、10 mm、15 mm的條件下,分別分析了截割角為40°、45°、50°和55°以及截割線速度為2 m/s、3 m/s、4 m/s和5 m/s十六種情況下煤壁微破壞、截齒載荷以及截割比能耗。再次,建立了雙齒截割模型,研究了相關(guān)截割模式與非相關(guān)截割模式下鎬型截齒截割機(jī)理與截割性能。此外,探討了切削厚度為5 mm、10 mm、15 mm和20 mm的條件下及截線距為10 mm、20 mm、30 mm、40mm、50 mm、60 mm、70 mm和80 mm三十二種情況下鎬型截齒對(duì)煤壁的微破壞、載荷以及截割比能耗。最后,建立了單齒旋轉(zhuǎn)截割模型與滾筒截割模型,分別分析了截齒(滾筒)轉(zhuǎn)速為40 r/min、50 r/min、60 r/min和70 r/min以及牽引速度為2 m/min、3 m/min、4 m/min和5 m/min十六種情況下截齒與滾筒的截割性能。通過上述研究?jī)?nèi)容,得出以下結(jié)論:利用回歸分析法驗(yàn)證了仿真結(jié)果的正確性與模擬煤壁的可靠性;截割線速度越大,截齒對(duì)煤體的剪切錯(cuò)動(dòng)作用越強(qiáng),隨著截割線速度與截割角的增大,截齒載荷與截割比能耗均呈先增大后減小的趨勢(shì),綜合考慮,截割線速度應(yīng)取3~4 m/s,截割角取45~50°為宜;截線距越大,截齒間的相互程度作用越弱,截齒對(duì)煤壁的剪切錯(cuò)動(dòng)作用越強(qiáng),截齒載荷越大,截線距與切削厚度之比為3.5~4之間時(shí),截割比能耗最小;滾筒載荷隨牽引速度的增大而增大,而隨著滾筒轉(zhuǎn)速的增大,滾筒載荷為先減小后增大,當(dāng)截齒轉(zhuǎn)速為60 r/min,牽引速度為2m/min時(shí),滾筒載荷達(dá)到最小值,與單齒旋轉(zhuǎn)截割仿真結(jié)果一致;滾筒截割比能耗隨牽引速度的增大而減小,而當(dāng)牽引速度恒定時(shí),隨著滾筒轉(zhuǎn)速的增大,截割比能耗則為先減小后增大,當(dāng)滾筒轉(zhuǎn)速為50 r/min,牽引速度為5 m/min時(shí),截割比能耗達(dá)到最小值,截割效率最高。
[Abstract]:Drum shearer is the main mechanical equipment of mechanized coal mining and plays an important role in coal mining. The study of the interaction between the cutter and the coal wall is helpful to further study the cutting performance of the drum and then to improve the working efficiency, stability and life of the shearer. In view of this, it is of great significance for the optimization design of spiral drum to study the failure and cutting performance of coal wall caused by cutting teeth under different parameters. In this paper, the cutting process of tooth cutting and drum cutting is studied, including the following contents. Firstly, based on the understanding of the physical and mechanical properties of coal wall, a discrete coal wall model is established by using PFC3D software. The uniaxial compression and Brazilian splitting simulation tests are carried out, and the mechanical properties of the simulated coal wall are measured to match the real coal wall. Then, the pick cutting model was established by UG software and PFC3D, was introduced to simulate the simulated coal wall with different cutting thickness. The reliability of the coal wall model was verified by regression analysis. Secondly, under the condition of cutting thickness of 5 mm,10 mm,15 mm, the coal wall microdamage under the cutting angle of 40 擄, 45 擄, 50 擄and 55 擄and the cutting speed of 2 m / s ~ 3 m / s ~ 4 m / s and 5 m / s is analyzed, respectively. Cutting load and cutting specific energy consumption. Thirdly, the double-tooth cutting model is established, and the mechanism and performance of pick cutting under the correlation cutting mode and the non-related cutting mode are studied. In addition, under the conditions of cutting thickness of 5 mm,10 mm,15 mm and 20 mm and intercept distance of 10 mm,20 mm,30 mm,40mm,50 mm,60 mm,70 mm and 80 mm 32, the micro-damage of coal wall caused by pick tooth is discussed. Load and cutting ratio energy consumption. Finally, the rotary cutting model of single tooth and the cutting model of drum are established. The rotational speed of cutter (drum) is 40 r / min 50 / min 60 r/min and 70 r/min, and the traction speed is 2 m / min ~ 3 m / min, respectively. Cutting performance of cutter and drum in 16 cases of 4 m/min and 5 m/min. The conclusions are as follows: the correctness of simulation results and the reliability of simulated coal wall are verified by regression analysis. With the increase of cutting speed and angle, the load and energy consumption of cutting increase first and then decrease. Considering synthetically, the cutting speed should be taken at 34 m / s. The cutting angle is 45 擄and 50 擄; The larger the intercept distance is, the weaker the interaction between the cutting teeth is, the stronger the cutting fault action of the cutting tooth is to the coal wall, the larger the cutting load is, and when the ratio of the cutting line distance to the cutting thickness is 3.5 ~ 4, the energy consumption of the cutting ratio is the least. The cylinder load increases with the increase of the traction speed, and decreases first and then increases with the increase of the rotational speed of the drum. When the gear cutting speed is 60 r / min and the traction speed is 2m/min, the drum load reaches the minimum value. The results are consistent with the simulation results of single-tooth rotary cutting. The specific cutting energy consumption of the cylinder decreases with the increase of the traction speed. When the traction speed is constant, the specific energy consumption decreases first and then increases with the increase of the drum speed. When the drum speed is 50 rmin and the traction speed is 5 m/min, the cutting specific energy consumption decreases first and then increases with the increase of the drum speed. The cutting ratio energy consumption reaches the minimum value and the cutting efficiency is the highest.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD421.6
本文編號(hào)：2358960
[Abstract]:Drum shearer is the main mechanical equipment of mechanized coal mining and plays an important role in coal mining. The study of the interaction between the cutter and the coal wall is helpful to further study the cutting performance of the drum and then to improve the working efficiency, stability and life of the shearer. In view of this, it is of great significance for the optimization design of spiral drum to study the failure and cutting performance of coal wall caused by cutting teeth under different parameters. In this paper, the cutting process of tooth cutting and drum cutting is studied, including the following contents. Firstly, based on the understanding of the physical and mechanical properties of coal wall, a discrete coal wall model is established by using PFC3D software. The uniaxial compression and Brazilian splitting simulation tests are carried out, and the mechanical properties of the simulated coal wall are measured to match the real coal wall. Then, the pick cutting model was established by UG software and PFC3D, was introduced to simulate the simulated coal wall with different cutting thickness. The reliability of the coal wall model was verified by regression analysis. Secondly, under the condition of cutting thickness of 5 mm,10 mm,15 mm, the coal wall microdamage under the cutting angle of 40 擄, 45 擄, 50 擄and 55 擄and the cutting speed of 2 m / s ~ 3 m / s ~ 4 m / s and 5 m / s is analyzed, respectively. Cutting load and cutting specific energy consumption. Thirdly, the double-tooth cutting model is established, and the mechanism and performance of pick cutting under the correlation cutting mode and the non-related cutting mode are studied. In addition, under the conditions of cutting thickness of 5 mm,10 mm,15 mm and 20 mm and intercept distance of 10 mm,20 mm,30 mm,40mm,50 mm,60 mm,70 mm and 80 mm 32, the micro-damage of coal wall caused by pick tooth is discussed. Load and cutting ratio energy consumption. Finally, the rotary cutting model of single tooth and the cutting model of drum are established. The rotational speed of cutter (drum) is 40 r / min 50 / min 60 r/min and 70 r/min, and the traction speed is 2 m / min ~ 3 m / min, respectively. Cutting performance of cutter and drum in 16 cases of 4 m/min and 5 m/min. The conclusions are as follows: the correctness of simulation results and the reliability of simulated coal wall are verified by regression analysis. With the increase of cutting speed and angle, the load and energy consumption of cutting increase first and then decrease. Considering synthetically, the cutting speed should be taken at 34 m / s. The cutting angle is 45 擄and 50 擄; The larger the intercept distance is, the weaker the interaction between the cutting teeth is, the stronger the cutting fault action of the cutting tooth is to the coal wall, the larger the cutting load is, and when the ratio of the cutting line distance to the cutting thickness is 3.5 ~ 4, the energy consumption of the cutting ratio is the least. The cylinder load increases with the increase of the traction speed, and decreases first and then increases with the increase of the rotational speed of the drum. When the gear cutting speed is 60 r / min and the traction speed is 2m/min, the drum load reaches the minimum value. The results are consistent with the simulation results of single-tooth rotary cutting. The specific cutting energy consumption of the cylinder decreases with the increase of the traction speed. When the traction speed is constant, the specific energy consumption decreases first and then increases with the increase of the drum speed. When the drum speed is 50 rmin and the traction speed is 5 m/min, the cutting specific energy consumption decreases first and then increases with the increase of the drum speed. The cutting ratio energy consumption reaches the minimum value and the cutting efficiency is the highest.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD421.6
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