02845nam a22003137a 4500003000400000005001700004008004100021022001400062040000900076100002100085130003900106245019300145264006800338300001400406336000900420337001600429338001200445440002800457500187300485650001902358650002102377650001802398650001602416650002302432700001902455700001902474700002002493700001802513OSt20261001142901.0261001b        |||||||| |||| 00| 0 eng d  a1738-1266  cDSSC  aKang, Kyung-Sik   aJournal of Biosystems Engineering   aStudy on optimal working conditions for picking head of self-propelled pepper harvester by factorial test /cKyung-Sik Kang, Hoon-Sang Park, Seung-Je Park, Young-Sun Kang and Dae-Cheol Kim  aKorea :bThe Korean Society for Agricultural Machinery, c2016.  app. 12-20  atext  aunmediated   avolume   v41(1), 12-20x1738-1266  aPepper prices have risen continuously because of a decrease in cultivation area; therefore, mechanical harvesting systems for peppers should be developed to reduce cost, time, and labor during harvest. In this study, a screw type picking head for a self-propelled pepper harvester was developed, and the optimal working conditions were evaluated considering helix types, winding directions of helix, and rotational speeds of the helix. Methods: The screw type was selected for the picking head after analyzing previous studies, and the device consisted of helices and a feed chain mechanism for conveying pepper branches. A double helix and a triple  helix were manufactured, and rotational speeds of 200, 300 and 400 rpm were tested. The device was controlled by a variable speed (VS) motor and an inverter. Both the forward and reverse directions were tested for the winding and rotating directions of the helix. An experiment crop (cultivar: Longgreenmat) was cultivated in a plastic greenhouse. The test results were analyzed using the SAS program with ANOVA to examine the relationship between each factor and the performance of the picking head. Results: The results of the double and triple helix tests in the reverse direction showed gross harvest efficiency levels of 60-95%, mechanical damage rates of 8-20%, and net marketable portion rates of 50-80%. The dividing ratio was highest at a rotational speed of 400 rpm. Gross harvest efficiency was influenced by the types of helix and rotational speed. Net marketable portion was influenced by rotational speed but not influenced by the type helix. Mechanical damage was not influenced by the type of helix or rotational speed. Conclusions: Best gross harvest efficiency was obtained at a rotational speed of 400 rpm; however, operating the device at that speed resulted in vibration, which should be reduced. 0aFactorial test 0apepper harvester 0aPicking head  0aScrew type  0aWorking conditions  aHoon-Sang Park  aSeung-Je Park   aYoung-Sun Kang   aDae-Cheol Kim