Design and Experimental Analysis of a Stirring Device for a Pneumatic Precision Rice Seed Metering Device

2020 ◽  
Vol 63 (4) ◽  
pp. 799-808
Author(s):  
He Xing ◽  
Ying Zang ◽  
Man Zai Wang ◽  
Wen Xi Luo ◽  
Hua Ming Zhang ◽  
...  
Keyword(s):  
High Resistance ◽  
Mechanical Model ◽  
High Speed ◽  
Test Material ◽  
High Speed Photography ◽  
List Type ◽  
Rice Seed ◽  
Sowing Seed ◽  
Seed Metering Device ◽  
Poor Stability

HighlightsThe problems of high resistance to seed sucking and the poor stability of seed sucking were solved.A mechanical model was established for seeds in a seed stirring device.The optimum parameters of the seed stirring device were obtained.Seeding precision was improved, providing a reference for the seed sucking process.Abstract. To achieve a goal of precision seeding with 1 to 3 seeds per hill and to solve problems in a pneumatic rice seed metering device, including high resistance to seed sucking, poor stability of seed suction, and low seeding precision, a cylindrical seed stirring device was designed. The design was based on the characteristics of the rice seed flow in the seed suction area. A mechanical model of the rice seed in the seed stirring device was established. The relationships between the seed fluidity and the parameters of the seed stirring device were simulated with EDEM software. The effects of seed fluidity on the seed suction area were analyzed under different seed stirring device parameters. To analyze the influences of different parameters of the seed stirring device on seed stirring and to observe the relationships between different parameters and rice seeds, high-speed photography was used to observe the seed sucking and stirring processes. The super hybrid rice Y-2 You 900 was selected as the test material. The seeding precision was tested at different rotating speeds, negative pressures, and parameters of the seed stirring device. The test results showed that an increase in the diameter and thickness of the seed stirring device was beneficial for increasing the seed absorption rate and reducing the missed seed rate but also increased the rate of multiple-seed sucking and reduced the seeding precision. The optimal parameters of the seed stirring device were a cylinder thickness of 2 mm and a diameter of 5 mm. This study provides a certain reference basis for the seed suction process of a pneumatic seed metering device. Keywords: Agricultural machinery, Precision seeding, Rice sowing, Seed stirring device, Seeder.

Numerical Simulation and Experiment of Motion of Rice Seed in Pneumatic Seed-Metering Device

2012 ◽  
Vol 249-250 ◽  
pp. 657-662
Author(s):  
Ya Xin Yu ◽  
Yuan Yuan Yang ◽  
Bin Zheng ◽  
Fei Zhang
Keyword(s):  
High Speed ◽  
Theoretical Models ◽  
Video Camera ◽  
Rice Seed ◽  
Working Process ◽  
Straight Pipe ◽  
Element Analysis ◽  
High Speed Video Camera ◽  
Simulation And Experiment ◽  
Seed Metering Device

A new-style pneumatic precision seed-metering device for super rice seed was proposed. This paper analyzed the working process for seed-metering device. The movement of rice seed in the “L” tube was simulated by finite element analysis software. The speed distribution, pressure distribution of air in the “L” tube and the trajectory of rice seed were solved. Results of the analyses indicated that there were partial reflux at the entrance and elbow; while the airflow moved steadily at the straight pipe. Based on the fabricated device, the motion trajectory was studied by high speed video camera. Experiment was used to analyze the effect of parameters. The results showed that the experimental trajectory was in accordance with theoretical models.

Crack divergence phenomena in tempered glass

2020 ◽  
Vol 13 (3) ◽  
pp. 115-129
Author(s):  
Shin’ichi Aratani
Keyword(s):  
Optimal Design ◽  
High Speed ◽  
Glass Plate ◽  
Acute Angle ◽  
Divergence Angle ◽  
High Speed Photography ◽  
Tempered Glass ◽  
Thick Glass

High speed photography using the Cranz-Schardin camera was performed to study the crack divergence and divergence angle in thermally tempered glass. A tempered 3.5 mm thick glass plate was used as a specimen. It was shown that two types of bifurcation and branching existed as the crack divergence. The divergence angle was smaller than the value calculated from the principle of optimal design and showed an acute angle.

Experimental study of hydrodynamic effects in the inverse water hydrocarbon emulsions flow in microchannels

2016 ◽  
Vol 11 (1) ◽  
pp. 30-37 ◽  
Author(s):  
A.A. Rakhimov ◽  
A.T. Akhmetov
Keyword(s):  
High Speed ◽  
Petroleum Industry ◽  
Chemical Compounds ◽  
High Viscosity ◽  
Blocking Effect ◽  
High Speed Photography ◽  
Simple Chemical ◽  
Reported Study ◽  
Dynamic Blocking ◽  
Hydrodynamic Effects

The paper presents results of hydrodynamic and rheological studies of the inverse water hydrocarbon emulsions. The success of the application of invert emulsions in the petroleum industry due, along with the high viscosity of the emulsion, greatly exceeding the viscosity of the carrier phase, the dynamic blocking effect, which consists in the fact that the rate of flow of emulsions in capillary structures and cracks falls with time to 3-4 orders, despite the permanent pressure drop. The reported study shows an increase in viscosity with increasing concentration or dispersion of emulsion. The increase in dispersion of w/o emulsion leads to an acceleration of the onset of dynamic blocking. The use of microfluidic devices, is made by soft photolithography, along with high-speed photography (10,000 frames/s), allowed us to see in the blocking condition the deformation of the microdroplets of water in inverse emulsion prepared from simple chemical compounds.

scholarly journals Prey Capturing Dynamics and Nanomechanically Graded Cutting Apparatus of Dragonfly Nymph

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 559
Author(s):  
Lakshminath Kundanati ◽  
Prashant Das ◽  
Nicola M. Pugno
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
High Speed ◽  
Prey Capture ◽  
High Speed Photography ◽  
Sensory Organs ◽  
Dragonfly Nymph ◽  
Drag Forces ◽  
Predatory Insects ◽  
Dragonfly Nymphs

Aquatic predatory insects, like the nymphs of a dragonfly, use rapid movements to catch their prey and it presents challenges in terms of movements due to drag forces. Dragonfly nymphs are known to be voracious predators with structures and movements that are yet to be fully understood. Thus, we examine two main mouthparts of the dragonfly nymph (Libellulidae: Insecta: Odonata) that are used in prey capturing and cutting the prey. To observe and analyze the preying mechanism under water, we used high-speed photography and, electron microscopy. The morphological details suggest that the prey-capturing labium is a complex grasping mechanism with additional sensory organs that serve some functionality. The time taken for the protraction and retraction of labium during prey capture was estimated to be 187 ± 54 ms, suggesting that these nymphs have a rapid prey mechanism. The Young’s modulus and hardness of the mandibles were estimated to be 9.1 ± 1.9 GPa and 0.85 ± 0.13 GPa, respectively. Such mechanical properties of the mandibles make them hard tools that can cut into the exoskeleton of the prey and also resistant to wear. Thus, studying such mechanisms with their sensory capabilities provides a unique opportunity to design and develop bioinspired underwater deployable mechanisms.

Droplet transfer behavior of narrow gap laser wire filling welding

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940045 ◽  
Author(s):  
Z. Zhang ◽  
R. Wang ◽  
G. Gou ◽  
H. Chen ◽  
W. Gao
Keyword(s):  
Welding Speed ◽  
High Speed ◽  
Transition Period ◽  
High Speed Photography ◽  
Narrow Gap ◽  
Droplet Transfer ◽  
Transfer Behavior ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Droplet Transition

In this paper, we study the droplet transition behavior of narrow gap laser wire filling welding under the condition of changing welding speed and wire feeding speed, and it was observed by high-speed photography. It was found that with the increase of welding speed, the frequency of droplet transfer was reduced and the transition period was prolonged. With the increase of wire feeding speed, the wire was not fully melted and finally inserted into the molten pool.

Experimental Characterization of a Modified Airlift Pump

2014 ◽  
Author(s):  
Afshin Goharzadeh ◽  
Keegan Fernandes
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
High Speed ◽  
Water Flow Rate ◽  
High Speed Photography ◽  
Two Phase ◽  
Inner Diameter ◽  
Airlift Pump ◽  
Flow Map ◽  
Churn Flow

This paper presents an experimental investigation on a modified airlift pump. Experiments were undertaken as a function of air-water flow rate for two submergence ratios (ε=0.58 and 0.74), and two different riser geometries (i) straight pipe with a constant inner diameter of 19 mm and (ii) enlarged pipe with a sudden expanded diameter of 19 to 32 mm. These transparent vertical pipes, of 1 m length, were submerged in a transparent rectangular tank (0.45×0.45×1.1 m3). The compressed air was injected into the vertical pipe to lift the water from the reservoir. The flow map regime is established for both configurations and compared with previous studies. The two phase air-water flow structure at the expansion region is experimentally characterized. Pipeline geometry is found to have a significant influence on the output water flow rate. Using high speed photography and electrical conductivity probes, new flow regimes, such as “slug to churn” and “annular to churn” flow, are observed and their influence on the output water flow rate and efficiency are discussed. These experimental results provide fundamental insights into the physics of modified airlift pump.

Sign in / Sign up

Export Citation Format

Share Document