INMATEH - Agricultural Engineering

6

Authors: Nesterenko A.V., Leshchenko S.M., Vasylkovskyi O.M., Petrenko D.I.

The design of a pneumatic separator with the feeding device for grain multilayer feeding was suggested in this paper. The application of the device enables increasing the uniformity of the airflow field velocity and the quality separation indicators. In order to determine the impact of grain multilayer feeding on the quality of grain cleaning we conducted a quantitative distribution of light grain impurities in the operating separation area. As a result, a statistical model of the probability of light impurities passing through the grain layers in the process of grain multilayer feeding in pneumatic and separating channel was obtained and the influence of specific load on the quality of grain cleaning was analytically determined.

8

Authors: Kobets A.S., Naumenko M.M., Ponomarenko N.O., Kharytonov M.M.,Velychko O.P., Yaropud V.M.

The mathematical model for substantiation of engineering factors of machineries for centrifugal type mineral fertilization is developed. It is proposed the design of the disk application for which one could improve evenness of mineral fertilizers spreading by centrifugal type spreaders. Simplified formulas for agricultural engineering usage, givingthe opportunity to explain the construction of the fertilizer spreader which provides qualitative spreading for the given bandwidth, are also presented.

8

Authors: Karaköse T., Tekgüler A.

In the cleaning process, different relative velocities of the grains through the air stream are utilized. The purpose of this study is to determine parameters such as fan angle, material feed rate and air velocity which will ensure separation of corn. Cleaning efficiency increased with increasing fan angle and air velocity and decreased with increasing feed rate. Loss rate increased with increasing fan angle and air velocity, and decreased with increasing feed rate. It can be said that the most appropriate combination (89.79% cleaning efficiency and 0.24% loss rate) was the application at 30° fan angle, 1152 kgh-1 feed rate and 15 ms-1 air velocity.

8

Authors: Rodimtsev S.A., Kuznetsov Y.A., Kolomeichenko А.V., Goncharenko V.V., Yagelsky M.Y., Ivanushkina N.M., Kalashnikova L.V.

The article presents the theoretical description of the interaction process between the straw particle and guide plate concave surface of the deflector of grain combine harvester disperser. The equation of particle present velocity is obtained. It is proved that particle velocity decreases by 8,5% at plate radius reduction from 5 m to 4 m and by 15% when particle angle of attack changes from 25° to 50°. To decrease adverse effect of particle interaction with guide surface we suggest the usage of bladed choppers with slantwise set cast blade.

9

Authors: Bulgakov V., Adamchuk V., Kuvachоv V., Ivanovs S.

A new scheme of the turn of a wide span tractor (vehicle) is presented for controlled traffic farming on the turning strip. The turn of the tractor, according to the presented scheme, allows moving the tractor to the next working position with better kinematic parameters. In addition to it, the improvement of the turnability characteristics is achieved at such a design embodiment of a wide span tractor when the ratio of its wheelbase to the width of the wheel track is as small as possible. The obtained equations about the movement of the wide span tractor for the offered new scheme of the turn allow estimating the impact of its design, performance, kinematic and power parameters upon the criteria of static and dynamic turnability.

10

Authors: Yang M.J., Liu B., Yang Z.R., Ding Z.Y., Yang L., Xie S.Y., Chen X.B.

According to matches of radiation properties of infrared heater and rapeseed, a small-scale infrared belt dryer was developed and its drying performance was tested and validated. Control factor of layer thickness has the highest significant level of impact on rapeseed effective moisture diffusivity and it is followed by factors of temperature, initial moisture content and radiation distance, sequentially. Two-term model gives the best fit to experimental data of moisture ratio, and it is followed by Page model. Both models are effective to predict moisture ratio of rapeseed infrared drying, with coefficient of correlation higher than 0.999.

10

Authors: Gao T., Han J., Tian X.Q., Xia L.

Non-circular gears are important parts of agricultural machinery, such as transplanters and plant setters. The uneven distribution of allowance in the machining process seriously affects the machining accuracy and working performance of non-circular gears. Therefore, this study considered non-circular gear shaping as the research subject to solve the uneven distribution of allowance caused by the change of the curvature of the gear blank’s pitch curve in non-circular gear machining. The influence of the radial motion on allowance distribution was determined by analyzing the geometric relationship between the shaper cutter and the gear blank in the machining process. Then, a normal linkage model of non-circular gear shaping was established, and the virtual and actual machining experiments were conducted. Finally, the machining method with evenly distributed allowance was simulated and validated. Results of the machining and testing show that the average unevenness of the allowance can be reduced from 110.21% to 4.95% through the machining method with evenly distributed allowance, meanwhile, the surface roughness Sa can be reduced from 3.18 μm to 1.26 μm. The proposed machining method can evenly distribute the allowance in the machining process, as well as remarkably improve the machining accuracy and surface quality of non-circular gears. The conclusions of this study provide significant references for the optimization and performance evaluation of non-circular gear machining methods.