Experiments and modeling of mechanism analysis of maize picking loss

Zhang, Zhen; Chi, Ruijuan; Du, Yuefeng; Pan, Xiaoyong; Dong, Naixi; Xie, Bin

doi:10.25165/j.ijabe.20211401.5745

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…Because corn is harvested for the ears rather than the stalks, the corn stalks need to be pulled down by the stalk rolls after feeding. Therefore, the forces applied to the stalks on the corn header have a greater impact on corn harvesting ( Zhang et al, 2021 ). Theoretically, to improve the corn header’s ear picking adaptability for the reverse lodged corn, the velocity of pins on the gathering chains should be largely reduced to help with the lifting and feeding of stalks.…”

Section: Resultsmentioning

confidence: 99%

Measurement and Analysis of Root Anchorage Effect on Stalk Forces in Lodged Corn Harvesting

Chen

et al. 2022

Front. Plant Sci.

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The effect of root anchorage on corn stalk is the main cause of difficulties in stalk lifting and ear picking of lodged corn. To quantify the forces on the stalks caused by root anchorage in corn harvesting, a root force measurement system was designed and applied in this study. The bending moment and torsional moment on the upright and lodged corn stalks were measured in corn harvesting with the designed system and the results were compared with the manually measured failure boundaries. The manually measured results showed bending moments to push down the upright stalks, to lift the lodged corn stalks, and to slip the lodged corn stalks were 35.12, 23.33, and 40.36 Nm, respectively, whereas the torsional moments needed to twist off the upright and lodged corn stalks were 4.02 and 3.33 Nm, respectively. The bending moments that the corn header applied to the upright, forward lodged, reverse lodged, and lateral lodged corn stalks were 10.68, 22.24, 16.56, and 20.42 Nm, respectively, whereas the torsional moments on them were 1.32, 1.59, 1.55, and 1.77 Nm, respectively. The bending force was the main factor that broke the root anchorage and influenced the stalk movement of lodged corn in harvesting. By analyzing the bending moment curves on the lodged corn stalks, it was proposed that for the harvesting of corn lodged in the forward, reverse, and lateral direction, the corresponding harvester header improvement suggestions are enlarging the size of pins on the gathering chains, reducing the speed of gathering chains, and lengthening the snouts with a sleeker surface, respectively. This study provides base data for the root anchorage effect on lodged corn and provides references for the improved design of the corn harvester header.

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Section: Resultsmentioning

confidence: 99%

Measurement and Analysis of Root Anchorage Effect on Stalk Forces in Lodged Corn Harvesting

Chen

et al. 2022

Front. Plant Sci.

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“…where L j is the ear height of corn plant, mm; L s is the height of the center line in front of snapping rolls above ground, mm; L g is the working length of snapping rolls, mm; α is the angle between snapping rolls and horizontal plane, ( • ). According to information collected and sorted from the mainly promoted breeding corn in the Huanghuaihai region of China, the height L j is 700~1100 mm, the height L s is 300~500 mm, and the angle α is 25~35 • when corns are harvested [19]. It can be seen from Equation (1) that the length of snapping rolls is 328~725 mm.…”

Section: Structure Design Of Snapping Rollsmentioning

confidence: 99%

“…The quality of non-threshing kernels accounts for a percentage of the total quality of kernels after one plot has been harvested and threshing has been completed. The nonthreshing rate is calculated according to Equation (19), which is described as follows:…”

Section: Non-threshing Ratementioning

confidence: 99%

Optimization Design and Experiment of Ear-Picking and Threshing Devices of Corn Plot Kernel Harvester

et al. 2021

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In order to solve the problems of easy-to-break kernels and substantial harvest losses during kernel harvesting in breeding trials plot of corn, an ear-picking device and a threshing device of corn plot kernel harvester has been optimized. To automatically change the gap of the ear-picking plate, a self-elastic structure with compression spring and connecting rod is used. The ear-picking plate is glued, and an elastic rubber gasket is placed underneath it, which effectively improves the adaptability of the ear-picking device and reduces corn kernel collision damage during ear-picking. To ensure the self-purification of the ear-picking device, a combination of auger sieve hole cleaning device and lateral pneumatic auxiliary cleaning system is used. A dual-axial flow threshing device is designed, which uses a “U”-shaped conveying system to transport maize ears in the threshing chamber. The spacing of the concave sieve may be adjusted, and the residual kernels in the threshing chamber can be cleaned up after harvesting one plot by combining three cleanings, which meets the requirements of no mixing between plots. The force analysis of corn ears in the threshing chamber determines the best design plan for the forward speed, the speed of the second threshing drum, and the threshing gap. The breakage rate and non-threshing rate regression models were created using the quadratic regression orthogonal combination test, and the parameters were optimized using MATLAB. The verification test results showed that when the forward speed was 0.61 m/s, the second threshing drum speed was 500 r/min, and the threshing gap was 40 mm, the breakage rate was 1.47%, and the non-threshing rate was 0.89%, which met the kernel harvesting requirements in corn plots.

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“…Corn harvester cutting table has been extensively investigated by domestic and foreign researchers because of their critical role in harvesting the crop. Based on a thorough examination of corn-picking mechanism boundary conditions, Zhang et al calculated the impact of picking loss [2]. The seed removal and cob removal models were established to determine the best combination of parameters for corn picking and harvesting.…”

Section: Introductionmentioning

confidence: 99%

Development and Testing of Automatic Row Alignment System for Corn Harvesters

Geng

Liu

et al. 2022

Applied Sciences

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Corn harvester row alignment is a critical factor to improve harvesting quality and reduce cob drop loss. In this paper, a corn harvester automatic row alignment system is designed with a self-propelled corn combine harvester, incorporating a front-end touch row alignment mechanism of the cutting table and a harvester steering control system. Corn stalk lateral deviation from the reference row during harvesting is detected by a front-end touch-row alignment mechanism that serves as an input to the automatic alignment system. The harvester steering control system consists of Hirschmann PLC controller, electric steering wheel, steering wheel deflection angle detection device, display module and mode selection module, etc. The adaptive fuzzy PID control algorithm is used to determine the desired turning angle of the harvester steering wheel by combining with the harvester kinematic model, and the model is simulated and analyzed by Matlab/Simulink software. The automatic row alignment system was mounted on a 4LZ-8 self-propelled corn harvester for field tests, and the test results showed that the average percentage of deviation of corn stalks from the center of the row alignment cutting path within ±15 cm during the automatic row alignment process was 95.4% at harvester speeds ranging from 0 to 4.6 km/h, which could meet the requirements of the corn harvester for row alignment harvesting. The test results meet the requirements of the corn harvester for row alignment and serve as a benchmark for the research on automatic row alignment of corn harvesters.

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Experiments and modeling of mechanism analysis of maize picking loss

Cited by 9 publications

References 6 publications

Measurement and Analysis of Root Anchorage Effect on Stalk Forces in Lodged Corn Harvesting

Measurement and Analysis of Root Anchorage Effect on Stalk Forces in Lodged Corn Harvesting

Optimization Design and Experiment of Ear-Picking and Threshing Devices of Corn Plot Kernel Harvester

Development and Testing of Automatic Row Alignment System for Corn Harvesters

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