The article is devoted to the study of spreading of the twisted yarn in a spinning cell. The article presents the scheme and principle of operation of the effective design of the yarn-output tube of pneumomechanical s...The article is devoted to the study of spreading of the twisted yarn in a spinning cell. The article presents the scheme and principle of operation of the effective design of the yarn-output tube of pneumomechanical spinning machine. To determine the law of motion of a roller installed in a yarn-output tube, the tension of the thread enveloping the surface of the rotating roller was studied, as a result of which the equation of its motion was obtained. As a result of solving the equation, the values of the thread tension on the surface of the rotating roller are obtained. The dependences of the change in the tension of the thread in time are obtained depending on the angle of rotation and the mass of the roller. The recommended design of the yarn-output tube allows increasing the strength characteristics of the pneumomechanical yarn.展开更多
Based on the experiments, a new technique of reducing tube with two linked 3-roll roller dies was developed. The external friction conditions, velocity and the non-uniform deformation of metal were distinctly improved...Based on the experiments, a new technique of reducing tube with two linked 3-roll roller dies was developed. The external friction conditions, velocity and the non-uniform deformation of metal were distinctly improved, and the friction between metal and tool was decreased. Corrosion strip layers and photo-elastic coatings methods were adopted in the experiment for measuring residual stress, and the residual stresses in the drawn tube with 3-roll dies are reduced.展开更多
The metering device is the central part of the seeder discharging granular fertilizers or seeds from the hopper to the colter passing through the tube.Depending on the metering device design,the batches of particles a...The metering device is the central part of the seeder discharging granular fertilizers or seeds from the hopper to the colter passing through the tube.Depending on the metering device design,the batches of particles are discharged or discharged evenly.This research analyzes existing metering devices,and a new pin-roller metering device is recommended to discharge evenly high doses of granular fertilizers and wheat seeds at low rotation speeds.The objective was to adapt the metering device to precision agriculture so that a little electric motor containing gearbox drives every metering device.Therefore,the pin-roller metering device parameters were investigated to apply high doses of granular fertilizers and wheat seeds evenly.The optimal pin positions were determined according to response surface methods(RSM)by simulating the granular fertilizers and wheat seeds'behavior on DEM.The coefficient of variation(CV)and the slip rate(SR)of the particles between the pins were chosen as indicators for evaluating the pin-roller.The shape of the pin was specified,and then the number of lines,the number of pins in a line,and the pin height were chosen to optimize.The analysis of the simulation results shows the optimal parameters:the number of pins in a line is four,and the number of lines is sixteen.The SR of granular fertilizers and wheat seeds were 8%and 2%,respectively.The pin-roller metering device is compared with the six-grooved and twelve-grooved metering devices.The comparison results show that the pin-roller metering device distributes twice more uniformly than other metering devices.The CV of the granular fertilizer distribution for six-grooved,twelve-grooved,and pin-roller metering devices was 111.13%,80.74%,and 37%,respectively.The CV of the wheat seed distribution for twelve-grooved and pin-roller metering devices was 96%,and 37%,respectively.As long as the particles interact with the tube,leaving the metering device,the effect of tube type and position is investigated.As a result,it was determined that the tub展开更多
文摘The article is devoted to the study of spreading of the twisted yarn in a spinning cell. The article presents the scheme and principle of operation of the effective design of the yarn-output tube of pneumomechanical spinning machine. To determine the law of motion of a roller installed in a yarn-output tube, the tension of the thread enveloping the surface of the rotating roller was studied, as a result of which the equation of its motion was obtained. As a result of solving the equation, the values of the thread tension on the surface of the rotating roller are obtained. The dependences of the change in the tension of the thread in time are obtained depending on the angle of rotation and the mass of the roller. The recommended design of the yarn-output tube allows increasing the strength characteristics of the pneumomechanical yarn.
文摘Based on the experiments, a new technique of reducing tube with two linked 3-roll roller dies was developed. The external friction conditions, velocity and the non-uniform deformation of metal were distinctly improved, and the friction between metal and tool was decreased. Corrosion strip layers and photo-elastic coatings methods were adopted in the experiment for measuring residual stress, and the residual stresses in the drawn tube with 3-roll dies are reduced.
基金the financial support provided by the National Key Research and Development Program of China(Grant No.2018YFD0701102).
文摘The metering device is the central part of the seeder discharging granular fertilizers or seeds from the hopper to the colter passing through the tube.Depending on the metering device design,the batches of particles are discharged or discharged evenly.This research analyzes existing metering devices,and a new pin-roller metering device is recommended to discharge evenly high doses of granular fertilizers and wheat seeds at low rotation speeds.The objective was to adapt the metering device to precision agriculture so that a little electric motor containing gearbox drives every metering device.Therefore,the pin-roller metering device parameters were investigated to apply high doses of granular fertilizers and wheat seeds evenly.The optimal pin positions were determined according to response surface methods(RSM)by simulating the granular fertilizers and wheat seeds'behavior on DEM.The coefficient of variation(CV)and the slip rate(SR)of the particles between the pins were chosen as indicators for evaluating the pin-roller.The shape of the pin was specified,and then the number of lines,the number of pins in a line,and the pin height were chosen to optimize.The analysis of the simulation results shows the optimal parameters:the number of pins in a line is four,and the number of lines is sixteen.The SR of granular fertilizers and wheat seeds were 8%and 2%,respectively.The pin-roller metering device is compared with the six-grooved and twelve-grooved metering devices.The comparison results show that the pin-roller metering device distributes twice more uniformly than other metering devices.The CV of the granular fertilizer distribution for six-grooved,twelve-grooved,and pin-roller metering devices was 111.13%,80.74%,and 37%,respectively.The CV of the wheat seed distribution for twelve-grooved and pin-roller metering devices was 96%,and 37%,respectively.As long as the particles interact with the tube,leaving the metering device,the effect of tube type and position is investigated.As a result,it was determined that the tub
