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<p>Sericulture involves key stages such as mulberry cultivation, silkworm rearing, and cocoon harvesting. The chawki stage, where young silkworms are reared for 8–10&#xa0;days, requires severe hygiene and a consistent supply of chopped mulberry leaves. Traditional methods of separating leaves from stems are labor-intensive and unhygienic, creating the need for combined winnower and leaf chopping machine to automate and streamline the process. A novel two-stage filtration mechanism was developed. First, an offset slider-crank system removes small stem particles using a slotted sieve. The system was modeled in CATIA, with motion analysis performed using ADAMS software. To optimize leaf-air dynamics, a 2D mathematical model and MATLAB simulations were used to predict leaf trajectories under blower-induced drag, guiding the design of a compact screening chamber. The airflow behavior was further validated using FLUENT 16.0 CFD simulations. Stem weights were categorized based on size: lighter stems (0.28–0.32&#xa0;g, 2.5&#xa0;mm × 4.8&#xa0;mm) and heavier stems (0.45–0.5&#xa0;g, 6–8&#xa0;mm). A sieving mechanism was tailored to filter lighter stems, while a blower-based screening chamber separated heavier stems from the leaves. An airflow velocity of 6&#xa0;m/s was found optimal—allowing leaves to exit the chamber stems settled internally. A conveyor links the chopping unit to the winnowing chamber, eliminating manual handling and preserving leaf moisture. The system achieves 5&#xa0;kg/min throughput with over 80% separation efficiency, reducing labor while ensuring clean, moisture-retaining feed for healthy silkworm development.</p>

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Development and Efficiency Analysis of Winnower Attachment Integrated with Leaf Chopper for Silkworm Rearing Chawki Centre

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • C. H. Manjunath Nayaka,
  • B. U. Balappa

摘要

Sericulture involves key stages such as mulberry cultivation, silkworm rearing, and cocoon harvesting. The chawki stage, where young silkworms are reared for 8–10 days, requires severe hygiene and a consistent supply of chopped mulberry leaves. Traditional methods of separating leaves from stems are labor-intensive and unhygienic, creating the need for combined winnower and leaf chopping machine to automate and streamline the process. A novel two-stage filtration mechanism was developed. First, an offset slider-crank system removes small stem particles using a slotted sieve. The system was modeled in CATIA, with motion analysis performed using ADAMS software. To optimize leaf-air dynamics, a 2D mathematical model and MATLAB simulations were used to predict leaf trajectories under blower-induced drag, guiding the design of a compact screening chamber. The airflow behavior was further validated using FLUENT 16.0 CFD simulations. Stem weights were categorized based on size: lighter stems (0.28–0.32 g, 2.5 mm × 4.8 mm) and heavier stems (0.45–0.5 g, 6–8 mm). A sieving mechanism was tailored to filter lighter stems, while a blower-based screening chamber separated heavier stems from the leaves. An airflow velocity of 6 m/s was found optimal—allowing leaves to exit the chamber stems settled internally. A conveyor links the chopping unit to the winnowing chamber, eliminating manual handling and preserving leaf moisture. The system achieves 5 kg/min throughput with over 80% separation efficiency, reducing labor while ensuring clean, moisture-retaining feed for healthy silkworm development.