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Subject: Others × Author: Ankit × End date: 2008 × Start date: 2008 × Type: Thesis ×
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    DESIGN, DEVELOPMENT AND FIELD EVALUATION OF MECHANICAL COTTON PICKING AID
    (Punjab Agricultural University, Ludhiana, 2008) Ankit
    A mechanical cotton picking aid was designed and developed for picking of cotton from the cotton bolls. A cyclone separator was designed and developed according to the airflow rate of blower for maximum speed of the blower. An electro magnet was also designed for the lifting of valve according to the force required to pull the valve. Preliminary testing of the picking aid was done in the field at different combination of the picker end diameter (20, 25, 32 and 40 mm) and suction pressures (25,30,35,40,45 and 50 mm of Hg). Suction pressures were not uniform. For uniform level of suction pressures extrapolation of trend line were done to have value of picking efficiency, trash content and output capacity. Maximum picking efficiency of 96.3 % had been achieved at 25 mm of picker end diameter with suction pressure of 45 mm of Hg. Minimum trash content of 0.65 % was observed at 20 mm of picker end diameter with suction pressure of 30 mm of Hg. Maximum output capacity of 6.25 kg/h was achieved at 25 mm of picker end diameter with suction pressure of 45 mm of Hg. Picking aid was evaluated for long term field trials with optimize picker end diameter (25mm) and suction pressures (35,40,45 and 50 mm of Hg) for two stage of picking. Though the picking efficiency and output capacity was maximum at 50 mm of Hg suction pressure for first stage of picking but trash content also increased at 50 mm of Hg suction pressure. Trash content was minimum (5.7 %) at 35 mm of Hg with picking efficiency of 93.9 % and output capacity of 4.2 kg/h. Similarly for second stage of picking, trash content was minimum (4.39 %) at 35 mm of Hg with picking efficiency of 92.8 % and output capacity of 4.01 kg/h were also lower. Picker end diameter and suction pressure had affected the picking efficiency, trash content and output capacity significantly at 5% level of significance. Also effect of interaction of both the factors were significant at 5% level of significance for output capacity and trash content but were non significant in case of picking efficiency. The combination of picker end diameter 25 mm and 40 mm of Hg suction pressure were the best combination for optimal picking efficiency, output capacity and trash content.