Investigation of the maize ear threshing process

Petkevichius, S.; Shpokas, L.; Kutzbach, Heinz Dieter

doi:10.1016/j.biosystemseng.2008.01.002

Cited by 37 publications

(53 citation statements)

References 1 publication

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“…Data showed that non-significant increase in kernel damaged at increasing shelling plate speed and reducing clearance during the highest crank radius. Generally, this percentage was lower than permissible level 0.5% with all treatments under study according to Petkevichius et al (2008). Therefore these percentages can be neglected.…”

Section: Kernel Damagementioning

confidence: 82%

“…Based on shelling action, the sheller may be classified into reciprocating and continuous or rotary types. Petkevichius et al (2008) states that grain losses during the threshing exceed the permissible level as the ear moved through the concave, rotated about its axis and jumped, also the grains moved longer distance. While, Sudajan et al (2002) indicated that the grain damage increased with an increase each of drum speed and feed rates.…”

Section: Introductionmentioning

confidence: 99%

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The Hand Pedal Type With Reciprocating Sheller Plate to Shell Corn

El-Hanfy

2010

Journal of Soil Sciences and Agricultural Engineering

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The aim of present paper is to construct, design and evaluate corn sheller to achieve shelled kernels with highest efficiency and lowest damage in proper time. Those, the reciprocating shelling plate is investigated to reduce the kernel movement in varies direction inside the prototype consequentially decrease the kernels damage. The experimental prototype consists of the main frame consists of three similar cub units (holding device), shelling plate and the inversion of slider crank chain mechanism regulated with four different crank radii (4.5; 6.5; 8.5; 10.5 cm). The undepended variables were different levels of reciprocating cycles, three levels for each of shelling teeth number, clearance and reciprocating shelling plate times at different crank radii. The shelling plate speed (m/s) was recorded relative to the angular speed of connecting shelling plate with the end point of crank radius. All experiments were carried out under constant kernel and cob ear moisture content "MC" of 10.8% and 10.32 "wb" respectively. The study gives the indicator to judge and deduce that the best factors which gives the highest shelling efficiency (98.8%) and the highest productivity (78.392 kg/h) were 100 number of shelling teeth, 25mm clearance, 105cm crank radius and 65.4cycle/min shelling plate reciprocating. On the other hand, the external and internal cracks of the shelled corn are low percentage.

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Section: Kernel Damagementioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

The Hand Pedal Type With Reciprocating Sheller Plate to Shell Corn

El-Hanfy

2010

Journal of Soil Sciences and Agricultural Engineering

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“…To ensure minimum loss during corn harvesting, the combine-harvester threshing apparatus, cleaning shoe and other mechanisms must undergo particular reconstructions and adjustments [2]. The performance of threshing apparatus depends on the feed rate, concave clearance and cylinder speed (linear speed of rasp bars) [3]. Setting wellbalanced technological parameters for adjustment of the threshing apparatus not only increases throughput of the combine harvester but also improves the quality indicators of the threshing process.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the influence of threshing cylinder design on the airflow within the threshing apparatus, a potentially improved filler plate can be designed [8,9]. The airflow caused by cylinder rotation was sufficient to keep some part of the grains suspended in the air and even to be blown from the threshing apparatus [3]. In 2010, the German company CLAAS patented an enclosed threshing cylinder.…”

Section: Introductionmentioning

confidence: 99%

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

Kiniulis

Steponavičius

Andriušis

et al. 2017

mech

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“…The speed of crop flow movement was also measured with the inductive speed sensor, the coil of which was bound by Capron thread to the small bundle of crops fed into the threshing apparatus with the entire crop flow [9]. Some researchers, after capturing crop movement using high-speed cameras [10][11][12][13], analyzed the recorded images using computer software in order to find the speed of crop flow movement. However, the last mentioned method for wheat and other cereals flow movement is rarely used, as there are difficult to identify particular elements from the entire threshed mass.…”

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.

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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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Investigation of the maize ear threshing process

Cited by 37 publications

References 1 publication

The Hand Pedal Type With Reciprocating Sheller Plate to Shell Corn

The Hand Pedal Type With Reciprocating Sheller Plate to Shell Corn

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

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

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