Traditionally, the transmission device for cutter adopts gear mechanism combined with planar crank-rocker mechanism. In line with this drawback, this paper presents a practical spatial linkage mechanism. Through three...Traditionally, the transmission device for cutter adopts gear mechanism combined with planar crank-rocker mechanism. In line with this drawback, this paper presents a practical spatial linkage mechanism. Through three-dimensional modeling and kinematic analysis, it obtains the equation of motion for output displacement, speed and acceleration. Besides, it gets the kinetic curve through emulation. The emulation results indicate that RCSR mechanism can realize smooth and stable output of cutter, laying a foundation for future dimensional synthesis of the mechanism.展开更多
A new multifunctional testing device for rock fragmentation was introduced, which can conduct many experiments such as single cutting under static load, crushing under impact load, thrusting under static load and cutt...A new multifunctional testing device for rock fragmentation was introduced, which can conduct many experiments such as single cutting under static load, crushing under impact load, thrusting under static load and cutting-impact test under the dynamic and static load. The results of granite and concrete抯 experiments with polycrystalline diamond compact (PDC) flat cutters and carbide alloy cutters under different loadings show that the device has good performance, and the characteristics of broken rock under the combined loads are similar to that under the single static pressure or impact crushing the rock, and the combined loads can increase the effect of rock fragmentation obviously. The experimental methods and effects have the important meaning for studying new drill-ing tool on hard rock fragmentation.展开更多
As the existing residual film crushing device in Xinjiang cannot directly crush membrane-impurity mixed material,by analyzing the compressive and cutting force characteristics of residual film material layer and cotto...As the existing residual film crushing device in Xinjiang cannot directly crush membrane-impurity mixed material,by analyzing the compressive and cutting force characteristics of residual film material layer and cotton stalk,the cutting conditions of mixed materials were obtained,and the method of cutting was determined.A multi-edge toothed cutters was created,and a cutting device was built.It was preliminarily determined that the number of teeth in the cutters was 8,the clearance between the teeth and between the tooth and fixed blade was 3 mm,the speed of the high-speed cutter was 800 r/min,and the speed difference between the high-and low-speed cutters was-300 r/min.Test results show that the ratio of residual film to total residual film sampling mass was(2.22±0.30)%,(19.19±2.02)%,(58.94±3.19)% and(20.65±2.05)%,respectively,when the maximum outer profile size in the range of[0,20)mm,[20,100)mm,[100,500)mm and[500,~)mm.The mass of cotton stalks with lengths of[0,50)mm,[50,100)mm and[100,~)mm accounted for(32.57±1.5)%,(27.77±1.3)%and(39.66±1.75)%,respectively,and the cutting power consumption was(85.41±15.63)kJ.The test results can provide a basis for the subsequent membrane-impurity mixed material cutting technology,as well as some guidance for the separation of it.展开更多
基金Supported by Project of Department of Education of Sichuan Province( Grant No.:12ZB321)the Key Disciplinary of Mechanical Design and Theory of Xinhua University (Grant No.:XZD0813-09-1)
文摘Traditionally, the transmission device for cutter adopts gear mechanism combined with planar crank-rocker mechanism. In line with this drawback, this paper presents a practical spatial linkage mechanism. Through three-dimensional modeling and kinematic analysis, it obtains the equation of motion for output displacement, speed and acceleration. Besides, it gets the kinetic curve through emulation. The emulation results indicate that RCSR mechanism can realize smooth and stable output of cutter, laying a foundation for future dimensional synthesis of the mechanism.
文摘A new multifunctional testing device for rock fragmentation was introduced, which can conduct many experiments such as single cutting under static load, crushing under impact load, thrusting under static load and cutting-impact test under the dynamic and static load. The results of granite and concrete抯 experiments with polycrystalline diamond compact (PDC) flat cutters and carbide alloy cutters under different loadings show that the device has good performance, and the characteristics of broken rock under the combined loads are similar to that under the single static pressure or impact crushing the rock, and the combined loads can increase the effect of rock fragmentation obviously. The experimental methods and effects have the important meaning for studying new drill-ing tool on hard rock fragmentation.
基金financially supported by the Fund for Less Developed Regions of the National Natural Science Foundation of China(Grant No.52065058)Graduate Education Innovation Project of Xinjiang Uygur Autonomous Region(Grant No.Xj2022G085)+2 种基金the Key Industry Innovation Development Support Plan of South Xinjiang(Grant No.2020DB008)the Open Fund of Jiangsu Province and Education Ministry Co-sponsored Synergistic Innovation Center of Modern Agricultural Equipment(Grant No.XTCX2006)Scientific and technological innovation team of Xinjiang Production and Construction Corps(Grant No.2020CB013).
文摘As the existing residual film crushing device in Xinjiang cannot directly crush membrane-impurity mixed material,by analyzing the compressive and cutting force characteristics of residual film material layer and cotton stalk,the cutting conditions of mixed materials were obtained,and the method of cutting was determined.A multi-edge toothed cutters was created,and a cutting device was built.It was preliminarily determined that the number of teeth in the cutters was 8,the clearance between the teeth and between the tooth and fixed blade was 3 mm,the speed of the high-speed cutter was 800 r/min,and the speed difference between the high-and low-speed cutters was-300 r/min.Test results show that the ratio of residual film to total residual film sampling mass was(2.22±0.30)%,(19.19±2.02)%,(58.94±3.19)% and(20.65±2.05)%,respectively,when the maximum outer profile size in the range of[0,20)mm,[20,100)mm,[100,500)mm and[500,~)mm.The mass of cotton stalks with lengths of[0,50)mm,[50,100)mm and[100,~)mm accounted for(32.57±1.5)%,(27.77±1.3)%and(39.66±1.75)%,respectively,and the cutting power consumption was(85.41±15.63)kJ.The test results can provide a basis for the subsequent membrane-impurity mixed material cutting technology,as well as some guidance for the separation of it.
