A Mathematical Model for Predicting Output Capacity of Selected Stationary Spike-Tooth Grain Threshers

Ndirika, V. I. O.

doi:10.13031/2013.20281

Cited by 7 publications

(4 citation statements)

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“…• Machine productivity The machine's productivity is defined as the mass of passed materials from the thresher per the time unit [17]. The machine productivity was calculated by dividing the threshed sunflower heads quantity on threshing time as the following equation:…”

Section: Measurementsmentioning

confidence: 99%

Testing, Evaluating and Simulate the Performance of the Newly Designed Drum for a Sunflower Threshing Machine

Ali

Zong

et al. 2022

JERA

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The stationary thresher machines are widely used worldwide in threshing and separating many crops; they proved to have a high performance, especially in small spaces. The threshing drum is the essential working device of the thresher and plays a fundamental role in threshing efficiency, consumed specific energy, machine productivity, and seeds loss. In this study, a structure of sunflower thresher (open style drum with 45 incline degree loop teeth) was tested, and evaluated for performance under different drum rotational speeds (150, 200, 250, and 300 rpm) and different concave clearances ( 10, 15 and 20 mm). The thresher structure and operating parameters were assessed and optimized concerning damaged and unthreshed seed percentage, threshing efficiency, consumed specific energy, and machine productivity. The obtained results revealed that increasing cylinder rotating speed positively related to threshing efficiency, power requirements, and machine productivity while increasing concave negatively related to threshing efficiency, power requirements, and machine productivity. The highest efficiency of 97.40 %, the maximum productivity of 434.50 kg/h, and the lowest consumed specific energy of 6.85 kW.h/t were obtained at the operational condition of 300 rpm drum rotational speed 10 mm concave clearance. Buckingham's π theorem was followed to find an equation to predict the threshing efficiency theoretically, resulting in an equation with an R2 value of 0.8892. These developments were an excellent choice to uprising the performance of the original thresher drum.

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Section: Measurementsmentioning

confidence: 99%

Testing, Evaluating and Simulate the Performance of the Newly Designed Drum for a Sunflower Threshing Machine

Ali

Zong

et al. 2022

JERA

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show abstract

“…The optimal configuration of a sunflower threshing apparatus and its efficacy can be determined based on parameters such as machine output, power consumption, threshing efficiency, grain damage, and unthreshed grain utilizing rudimentary tools and human labor (manual approach), as well as through the utilization of an advanced mechanized threshing machine (mechanical method) [18,19]. These evaluation parameters were followed in the current work to judge the performance of the threshing platform.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Performance of Sunflower Threshing Machines through Innovative Enhancements

Ali,

Li,

Wang

et al. 2024

Agriculture

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Improving the performance of the threshing process is of utmost importance in enhancing the quality of sunflower seeds and minimizing power consumption in sunflower production. In this study, we developed a modified sunflower threshing machine by incorporating two types of threshing rotors, namely the angled rasp bar rotor and the tine bar rotor, as compared to the round bar rotor. The performance of these rotors was evaluated under various rotational speeds (150, 200, 250, and 300 rpm) and concave clearances (10, 15, and 20 mm). The evaluation parameters included machine throughput, the specific energy of threshing, the percentage of damaged seeds, the percentage of unthreshed seeds, and threshing efficiency. The results indicate that the specific energy decreased with an increase in rotor speed and a decrease in concave clearance, with the tine bar rotor exhibiting the lowest values. Threshing efficiency showed an increasing trend with higher rotor speeds and reduced concave clearance. The modifications made to the rotor design resulted in an enhanced threshing efficiency, with an improvement from 96.30% to 97.93% achieved at a rotor revolving speed of 300 rpm and a concave clearance of 10 mm. Moreover, the specific energy consumption reduced from 9.65 kW·h/ton to 5.09 kW·h/ton under the same operational conditions. These findings highlight the efficacy of the novel rotor design modifications in optimizing the performance of the stationary sunflower threshing machine, leading to improved efficiency and reduced energy consumption in sunflower seed threshing operations. Given its performance characteristics, this machine exhibits potential suitability for sunflower farms of small to medium scale.

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“…Many researchers have done many experiments to examine grain threshing devices, and many kinds of grain threshers have been developed since the 1820s [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Axial Flow Rice Thresher Performance Optimization Using the Taguchi Technique

2021

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Combine harvesters are widely used worldwide in harvesting many crops, and they have many functions that cover the entire harvesting process, such as cutting, threshing, separating, and cleaning. The threshing drum is the core working device of the combine harvester and plays an influential role in rice threshing efficiency, threshing power requirement, and seed loss. In this study, two structures of rice threshers (conical-shaped and cylindrical-shaped) were tested and evaluated for performance under different thresher rotating speeds of 1100, 1300, and 1500 rpm and different feeding rates of 0.8, 1.1, and 1.4 kg/s. The experiment was designed using the Taguchi method, and the obtained results were evaluated using the same technique. The thresher structure and operating parameters were assessed and optimized with reference to threshing efficiency, required power, and productivity. The obtained results revealed that increasing thresher rotating speed and the feeding rate positively related to threshing efficiency, power, and productivity. The highest efficiency of 98% and the maximum productivity of 0.64 kg/s were obtained using the conical-shaped thresher under a 1500 rpm rotating speed and a feed rate of 1.4 kg/s, whereas the minimum required power of 5.45 kW was obtained using the conical thresher under a rotating speed of 1100 rpm and a feed rate of 0.8 kg/s.

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A Mathematical Model for Predicting Output Capacity of Selected Stationary Spike-Tooth Grain Threshers

Cited by 7 publications

References 0 publications

Testing, Evaluating and Simulate the Performance of the Newly Designed Drum for a Sunflower Threshing Machine

Testing, Evaluating and Simulate the Performance of the Newly Designed Drum for a Sunflower Threshing Machine

Enhancing the Performance of Sunflower Threshing Machines through Innovative Enhancements

Longitudinal Axial Flow Rice Thresher Performance Optimization Using the Taguchi Technique

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