Study of the grain particle-conveying performance of a bionic non-smooth-structure screw conveyor

Ma, Zheng; Wu, Zhiping; Li, Yufei; Song, Zhiqiang; Yu, Jie; Li, Yaoming; Xu, Lizhang

doi:10.1016/j.biosystemseng.2024.01.005

Cited by 9 publications

(2 citation statements)

References 24 publications

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“…It is found that the cylinder stability of the cylindrical shell is better when the flat end face is used [28]. At the same time, the stalks are damaged during the threshing process [29,30]. Some relevant researchers have optimized the combine harvester and significantly reduced the threshing loss rate [31][32][33].…”

Section: Test Methods (1) Stalk Winding State Modelmentioning

confidence: 99%

Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

Que,

Tang,

Wang

et al. 2024

Agriculture

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As a result of the uneven growth of rice, unbalanced vibration of threshing drum caused by stalk entanglement in combine harvester is more and more severe. In order to reveal the influence of unbalanced excitation on the roller axis locus during rice threshing, the stability of threshing drum was studied. The dynamic signal test and analysis system are used to test the axial trajectory of threshing drum. At the same time, the influence of the unbalanced excitation caused by the axis winding on the axis trajectory is analyzed by the experimental results. Axis locus rules under no-load and threshing conditions are obtained. In order to simulate the axial and radial distribution of unbalanced excitation along the threshing drum, the counterweight was distributed on the threshing drum instead of the entangled stalk. Then, the definite effect of unbalanced excitation on the rotating stability of threshing drum is analyzed. Results show that the amplitude of stem winding along the grain drum is larger in the vertical direction and smaller in the horizontal direction when compared with the unloaded state under 200 g weight. It was found that the amplitude in both horizontal and vertical directions decreased after 400 g and 600 g counterweights were added, respectively, to simulate the radial distribution of stalk winding along the grain barrel. Finally, it can be seen that with the increase in the weight of the counterweight, the characteristics of the trajectory misalignment of the threshing cylinder axis become more and more obvious. This study can provide reference for reducing the unbalanced excitation signal of threshing drum and improving driving comfort.

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Section: Test Methods (1) Stalk Winding State Modelmentioning

confidence: 99%

Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

Que,

Tang,

Wang

et al. 2024

Agriculture

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“…However, due to the different functions of each device, the vibration characteristics and the exciting force produced by each device are also different [4,5]. The generation of vibrations will not only affect the normal work of each device but also makes the mechanical harvest loss rate and impurity content rate of the overall harvester higher and then affects the overall harvest efficiency and harvest quality of the harvester [6,7]. Furthermore, the further superposition of the vibration of each device may make the overall combined harvester produce stronger vibrations and cause machine resonance, which will cause the fatigue failure of the whole machine and will then seriously affect the working performance and service life of the combined harvester [8,9].…”

Section: Introductionmentioning

confidence: 99%

Damping Optimization Method of Combine Harvester Frame Undergoing Multi-Source Excitation

Wang,

Chen,

Wang

et al. 2024

Agriculture

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The complex mechanical system of a rice combine harvester not only has various excitation sources, but also, the vibration transmission path between each working device and the vibration contribution characteristics to the frame are not clear, so it is difficult to perform a reduction vibration design for the sharp vibration of the rice combine harvester frame. Therefore, based on the comparison and improvement of multiple classical transfer path analysis methods, this paper analyzed the vibration transfer characteristics and transfer characteristics of each harvester by the discrete time matrix method and operating path method. In the Experimental section, through the vibration characteristic experiment firstly, this paper obtained the power spectrum variation and the most needed optimized path in the transmission path of each device under each operating condition. Secondly, through frame simulation analysis under the exciting force, we obtained the vibration damping areas that needs to be optimized. Finally, the damping optimization experiment connected with the vibration characteristic experiment, and the excitation force simulation analysis was performed. The results of the damping optimization experiment displayed that the maximum change value of the vibration acceleration of the cutting table decreased from 7.862 m·s−2 to 3.522 m·s−2, decreasing by 55.2%, and the peak amplitude of the multipoint test in the cab was 5.4, 5.3, 1.7 and 2.0 μm, respectively, which was significantly reduced, so the optimization effect was significant. This study provides theoretical support for the vibration reduction optimization of a rice combine harvester frame.

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Effect of groove textures on wear of friction pair between groove side and scraper under different factor combinations

Qiao,

Xia,

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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Three-body wear is the primary wear mechanism in friction pair between groove side and scraper. This study quantitatively investigates the effect of groove textures on three-body wear under different factor combinations through abrasive wear experiments. The results indicate that groove textures significantly reduce wear of samples. The wear reduction rate of sample reaches 41% under the optimal factor combination. Width, depth, and tilt angle of groove textures significantly influence wear loss. Among these factors, width exhibits a negative effect on the change of wear loss, while depth and tilt angle show positive effects. Additionally, there are interactive effects on the change of wear loss between width and depth, as well as width and tilt angle. The effect process of groove textures to three-body wear was qualitatively analyzed by discrete element method (DEM) simulation. Combined with wear morphologies, the wear-resistant mechanism of groove textures was explored. The results indicate that groove textures can mitigate the severity of three-body abrasive wear, reduce the contact area between particles and samples, alter particles movement and enhance wear resistance. Meanwhile, groove textures can serve as a guiding mechanism to modify particles movement and direction and transform the sliding motion of coal particles into rolling motion, converting the continuous “face-face” contact of three-body wear into intermittent “point-face” and “line-face” contacts. This study provides novel study ideas and theoretical foundations for wear-resistant designs in mining machinery and three-body wear equipment.

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Study of the grain particle-conveying performance of a bionic non-smooth-structure screw conveyor

Cited by 9 publications

References 24 publications

Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

Damping Optimization Method of Combine Harvester Frame Undergoing Multi-Source Excitation

Effect of groove textures on wear of friction pair between groove side and scraper under different factor combinations

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