Corn Ear Threshing Performance of Filler-Plate-Covered Threshing Cylinders

Kiniulis, Valdas; Steponavičius, Dainius; Andriušis, Albinas; Kemzūraitė, Aurelija; Jovarauskas, Darius

doi:10.5755/j01.mech.23.5.17389

Cited by 11 publications

(12 citation statements)

References 8 publications

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“…deflects threshed kernels towards concave grates. A smaller gap between adjacent rasp bars and suitable shape of FP cause kernel floating towards the concave, resulting in less damage of kernel [17].…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be explained as follows: only one quarter of the total mass of the flow of corn ears fed into the threshing apparatus is comprised of impurities (husk leaves, cobs, tassels and stalks) [17]. Whereas when threshing crops, straw accounts for 40 % of the total mass of the flow fed into the threshing apparatus, for deformation of which force is mainly consumed.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of corn ears movement within the threshing crescent using high-speed recording method

Steponavičius¹,

Kemzūraitė²,

Kiniulis³

et al. 2017

J. meas. eng.

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Abstract. The main objective of the research was to establish movement of corn ears within the threshing crescent between the cylinder and the concave using high-speed recording method. Tangential threshing unit was used in the experimental trials. Cylinder rotation and linear velocity of rasp bars (11.00 m s ) were determined by using threshing cylinder covered with filler plates having 4 different shapes. During the trials, speed of corn ears within threshing crescent, number of impacts received by the corn ear, rising height of the corn ear after impact of rasp bar and time between two impacts of rasp bar to the corn ear, depending on the shape of filler plates of threshing cylinder were found. Video analysis of corn ear movement showed that the speed of corn ears movement in the threshing crescent highly depends on linear velocity of rasp bars. The average speed of corn ear within threshing crescent and number of impacts received by the corn ear were increased with increase of linear velocity of rasp bars irrespective of cylinder filler plates are used. Moreover, both above-mentioned parameters were larger in the second part of concave length than in the first one. A tendency of increase of the corn ear moving over the surface of the concave and decrease of number of impacts received by the corn ear was observable by reduction in the threshing crescent. Following reduction of linear velocity of rasp bars to 14.14 m s -1 , it would be reasonable to cover the threshing cylinder with filler plates that can reduce the cross-section area between rasp bars and concave (to 94.26 cm 2 in view of one gap between adjacent rasp bar). In this case, filler plates showed a substantial effect on behaviour of corn ears: they restrict a rising height of the corn ear, may be subject to additional rotational motion, deflect the corn ear to the clearance between the rasp bar and the concave bar as well as deflect threshed kernels towards concave grates.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of corn ears movement within the threshing crescent using high-speed recording method

Steponavičius¹,

Kemzūraitė²,

Kiniulis³

et al. 2017

J. meas. eng.

Self Cite

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“…The experiments were performed at the laboratory for investigation into technological processes of agricultural machinery of the Institute of Agricultural Engineering and Safety using a stationary tangential single-cylinder threshing unit [26] that comprised the following: a belt feeder (10 m in length and 1.2 m in width) for feeding the corn ear into the threshing unit; a tangential threshing cylinder of 1.2 m in width and 0.6 m in diameter with eight rasp bars attached to it, which was wrapped in the grate-bar type concave.…”

Section: Methodology and Means Of The Experimentsmentioning

confidence: 99%

“…Feeding the threshing unit with a variable (uneven) flow of cereal crops or corn ears causes a significant loss in the quality of operation of combine harvesters. The use of filler plates in the cylinder during corn ear threshing was found to have a substantial effect on the threshing efficiency [26,27].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Indicators of a Corn Ear Threshing Process Influenced by the Threshing-Separation Unit Load

Kiniulis

Steponavičius

Kemzūraitė

et al. 2018

mech

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Corn ear feed rate variations in the threshing-separation unit of a combine harvester have a significant impact on the dynamic indicators of the threshing process. In this study, we conducted experiments using a stationary tangential threshing device and measured the forces acting on the rear part of the concave as well as the torque of the rotating cylinder during a threshing process. The ThreshLab software was developed for this purpose. We found that increasing the corn ear feed rate made the threshing process more even, due to decreasing the fluctuation of forces acting on the rear part of the concave and torque of the rotating cylinder. The corn ear threshing process may be more stable if the threshing cylinder is fitted with filler plates (FP-II). A comparison of the results obtained for variations in the forces acting on the rear part of the concave with those obtained for variations in the total torque of resistance and the speed of the threshing cylinder revealed a linear correlation between these parameters at varied feed rates. DOI: http://dx.doi.org/10.5755/j01.mech.24.4.20721

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“…The performance of the threshing cylinder depends on several process parameters, such as drum speed, concave clearance and feed rate [20]. The best performance for threshing cylinder is the lowest loss rate and lowest damage rate.…”

Section: Experiments Designmentioning

confidence: 99%

Multi-Objective Optimization of Process Parameters of Longitudinal Axial Threshing Cylinder for Frozen Corn Using RSM and NSGA-II

Yuan

Zhang

et al. 2020

Applied Sciences

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Corn was frozen at harvest time in high-latitude areas, when corn kernel is wetter and more easily broken. When frozen corn was threshed and separated by the longitudinal axial threshing cylinder of a combine harvester, it caused a significantly high kernel damage rate and loss rate. The process parameters of threshing cylinder were optimized using RSM (response surface method) and NSGA-II (Non-Dominated Sorted Genetic Algorithm-II). The drum speed (Ds), feed rate (Fr) and concave clearance (Cc) were determined as the optimized process parameters. The loss rate (Lr) and damage rate (Dr) were indicators of operational performance. The RSM was used to establish a mathematical model between process parameters and indicators. With an elite strategy, NSGA-II was used for multi-objective optimization to obtain the optimal operational performance of the threshing cylinder. Overall, when the drum speed was selected as 384.1 rpm, the feed rate as 8.6 kg/s and the concave clearance as 40.5 mm, according to the requirement of corn harvest, the best operational performance of the longitudinal axial threshing cylinder on frozen corn was obtained. The Lr was 1.98% and the Dr was 3.49%. This result indicated that the applicability of the optimal process parameters and the optimization method of combining NSGA-II and RSM was effective for determining the optimal process parameters. This will provide an optimization method for synchronously reducing the loss rate and damage rate of grain harvesters.

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Corn Ear Threshing Performance of Filler-Plate-Covered Threshing Cylinders

Cited by 11 publications

References 8 publications

Analysis of corn ears movement within the threshing crescent using high-speed recording method

Analysis of corn ears movement within the threshing crescent using high-speed recording method

Dynamic Indicators of a Corn Ear Threshing Process Influenced by the Threshing-Separation Unit Load

Multi-Objective Optimization of Process Parameters of Longitudinal Axial Threshing Cylinder for Frozen Corn Using RSM and NSGA-II

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