Experimental Study on Direct Harvesting of Corn Kernels

Chen

et al. 2022

The distribution of the threshed mixture is the link between the threshing and cleaning process during corn harvesting. Uneven distribution leads to a local accumulation of the mixture in the cleaning, resulting in high impurity and loss rate. Existing studies rarely concern the distribution of the corn threshed mixture. To address this problem, the distribution experiment was conducted in a self-made corn longitudinal axial threshing system to explore the distribution pattern, and both the particle size distribution and weight distribution of components (corn kernel, corn cob, and corn husk) were analyzed in this study. The results showed that the drum speed and concave clearance has a significant effect on particle size. Moreover, the impurities (corn cob, corn husk) increase with the drum speed. The weight distribution has an obvious uneven trend. In the axial weight distribution, corn kernels increased initially and decreased afterwards, while corn cobs and corn husks constantly increased. In the radial weight distribution, corn kernels and corn cobs were greater on both sides and less in the middle; corn husks had a clear left posterior accumulation. The increase in drum speed and feed rate and the decrease in concave clearance aggravated the inhomogeneity of the weight distribution. By analyzing the distribution characteristics, the drum speed of 400 r/min, concave clearance of 40 mm, and feed rate of 7 kg/s were confirmed to be optimal operating parameters. Under these conditions, the accumulation of the threshed mixture was weakened, which provided a satisfactory base for the subsequent cleaning. This study could provide a data support for the improvement of the threshing system. Additionally, this study is believed to have the potential to be used for the structural design of the cleaning system to reduce mixture accumulation and improve the cleaning performance.

Section: Discussionmentioning

confidence: 99%

Experimental Study on the Particle Size and Weight Distribution of the Threshed Mixture in Corn Combine Harvester

Chen

et al. 2022

“…Concerning corn kernels, the ventral part of the corn kernel (the impact location of corn seeds is shown in Figure 2) withstood a higher impact when the moisture content was the same [30,31]. Yang [32], Zhao [33], and Zhang [34] also drew the above conclusions. With the decrease in the grain moisture content, the hardness, tensile strength, and shear strength of the corn kernels increased.…”

Section: Effect Of Grain Moisture Content On Corn Threshingmentioning

confidence: 90%

Low-Damage Corn Threshing Technology and Corn Threshing Devices: A Review of Recent Developments

et al. 2023

Corn is a crucial crop and has a vital application value in many aspects of our lives. Mechanical grain harvesting is the developing direction of corn harvesting technology, with corn threshing as its most imperative procedure. The quality of the threshing device of the corn harvester has a major influence on its damage rate, loss rate, and other parameters. Therefore, it is of great significance to effectively lower the damage rate in the process of corn threshing. This review presents the research progress and the application status of corn threshing technology and corn threshing machinery. The conclusions and suggestions on low-damage corn threshing technology and corn threshing machinery are summarized to provide a reference for the reduction in the damage rate of mechanical grain harvesting and promote the development of mechanical grain harvesting technology.

“…Therefore, the rotating speed of the conveyor belt at the 0.5~0.5 level (actual value at 180-220 r/min) and the cutter-head speed at the 0.5~1 level (actual value at 350-400 r/min), a high qualifying rate of cabbage harvesting can be achieved. In order to obtain the optimal parameter combination for the qualifying rate of the 4GCSD-1200 type cabbage harvester, considering the boundary conditions of each factor, a constrained optimization was made on the objectives above, based on the cabbage operation quality requirements and actual operation conditions; the objective function and restrained condition are [27]:…”

Section: Analysis Of the Two-factor Interaction Effectmentioning

confidence: 99%

Parameter Optimization and Testing of a Self-Propelled Combine Cabbage Harvester

Cao

et al. 2022

On account of a lack of suitable and specialized harvesting equipment for cabbage species and planting modes in China, in this study, a type of 4GCSD-1200 type cabbage harvester was designed to further optimize the working performance of the cabbage harvester. First, the structure and working principles of the harvester were introduced, and the cabbage harvesting process was analyzed. Based on the test method and theoretical analysis, a single-factor test was carried out on the main working parameters of the sample machine, the advancing speed, rotating speed of the pulling roller, rotating speed of the conveyor belt, and the cutter-head were taken as independent variables, and the qualifying rate of cabbage harvesting was taken as the response value. According to the Box–Behnken test design principles, a four-factor three-level response surface analysis was adopted to establish a mathematical model between all test factors and the qualifying rate of cabbage harvesting, then all test factors and their interaction effects were analyzed. The test results showed that the optimal working parameters of the harvester were: the advancing speed was 1.1 km/h, the rotating speed of the pulling roller was 90 r/min, the rotating speed of the conveyor belt was 205 r/min, and the rotating speed of the cutter-head was 395 r/min. The verification test results showed that the qualifying rate of cabbage harvesting was 96.3%, showing a good harvesting effect, with uniformly cut notches and a low damage rate. The test indicates that by optimizing the working parameters, the damage during the mechanized harvesting of cabbage can be reduced and the qualifying rate of harvesting can be improved; the working effect could, therefore, satisfy the requirements of market harvesting.