• Journal of Biosystems Engineering
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• 제42권1호
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• pp.12-22
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• 2017

Purpose: This aim of this study was to develop a pick-up type pulse crop harvester for harvesting cut and dried pulse crop. Methods: The pick-up type pulse crop harvester was designed and constructed. Its specifications and operating performance were investigated. Results: Compared with conventional bean harvesters, the pick-up type pulse crop harvester adopted seven rows of chains with tines to pick-up the cut and dried pulse crop on a flat or ridged field, two transverse threshing drums with steel wire teeth to reduce the threshing speed, and a tilt plate and plastic bucket elevator for conveying clean grain to reduce damage. The threshing speed and the oscillating frequency of the separating and cleaning parts according to crop type and condition could be varied easily to efficiently use engine power and to improve harvesting performance. The harvester showed forward speed ranges of 0 ~ 1.5 m/s during harvesting operation, and 0 ~ 2.5 m/s during road travelling. The pick-up width of the harvester was about 1 m. Conclusions: The pick-up type self-propelled 51.5 kW harvester was designed and constructed to harvest cut and dried pulse crop. The effective field capacity of the harvester was predicted as above 40 a/h.

• Journal of Biosystems Engineering
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• 제39권4호
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• pp.283-289
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• 2014

Purpose: This study was carried out to evaluate the labor requirement and the cost-reducing effects of the pick-up type pulse crop harvester compared with those of conventional harvesting for soybeans and red beans. Methods: The labor requirement and the cost to gather, thresh, and clean for conventional harvesting operations were surveyed; those for the pick-up type pulse crop harvester were estimated for soybeans and red beans. The annual capacity of the harvester and the break-even area of the two harvesting methods were also estimated. Results: For soybean harvesting, the labor requirement of 0.57 hour-persons/10 a for the pick-up type pulse crop harvester reflects a 91.9% reduction in the labor requirement of 7.00 hour-persons/10 a for conventional harvesting. Machinery costs of 51,300 won/10 a for the harvester were estimated for an annual harvesting area of 52.5 ha/year, representing a reduction of 33.3% from the 78,700 won/10 a cost of conventional harvesting. A break-even area of 28.4 ha was estimated for the two harvestings. For red bean harvesting, the labor requirement of 0.57 hour-persons/10 a for the harvester reflects a 92.6% reduction in the labor requirement of 7.66 hour-persons/10 a for conventional harvesting. For an annual harvesting area of 52.5 ha/year, annual capacity of 52.5 ha/year and machinery costs of 51,700 won/10 a were estimated for the harvester, reflecting a reduction of 44.7% in the cost of 93,500 won/10 a for conventional harvesting. A break-even area of 23.1 ha was estimated for the two harvestings. A governmental subsidy for purchasing the harvester could contribute to reducing the break-even area and harvesting costs. Conclusions: The pick-up type pulse crop harvester for soybean and red bean harvesting could reduce the labor requirement and costs of conventional harvesting, and a governmental subsidy for purchasing the harvester will improve the economics of the harvester for efficient mechanical harvesting.

• 농업과학연구
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• 제44권1호
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• pp.114-122
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• 2017

An experimental pick-up type pulse crop harvester was built and its harvesting performance for green kernel black bean was evaluated. Field bean loss and harvested bean quality of the harvester were analyzed according to engine speeds of 2,000; 2,400; 2,800; 3,000; and 3,200 rpm, and travel speeds of 0.6; 1.0; and 1.4 m/s. Operating conditions and field capacity of the harvester for proper harvesting were estimated. The harvester had an optimum performance at a grain moisture content of 13.4%, an engine speed of 3,000 rpm, and a travel speed of 1.2 - 1.3 m/s. Subsequently, the picking-up, discharging, and total bean loss ratios were found to be 1.6, 1.3, and 2.9%, respectively. The whole bean, damaged bean, unthreshed bean, and foreign material ratios were determined to be 96.2, 1.0, 0.1, and 0.3%, respectively. Results showed that the harvester had lower bean loss and higher harvested bean quality than those of imported bean combines. The harvester could harvest 2 rows with a crop spacing of an approximately 1.4 m. Its optimum travel speed was estimated to be approximately 1.2 m/s when harvesting performance was taken into account using such variables as field bean loss and harvested bean quality for green kernel black bean. Effective field capacity of the harvester was estimated at approximately 40 a/h.

• 농업생명과학연구
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• 제51권2호
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• pp.165-173
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• 2017

본 연구는 시험용 수집형 자주식 두류 수확기를 설계 제작하여 예취 건조된 나물 콩을 대상으로 수확작업 성능을 파악하였다. 수확시험은 수확기의 엔진 회전속도 2000, 2400, 2800rpm, 작업속도 0.6, 1.0, 1.4m/s의 설정에 따라 수집 손실비율, 배진 손실비율 등 수확손실과 수확된 곡물 품질로서 완전립 비율, 손상립 비율, 미탈곡립 비율, 이물질 비율을 분석하였으며, 그 외 수확된 나물 콩의 발아세와 발아율, 작물 재배 폭과 작업속도를 고려한 작업능률을 조사 분석하였다. 시험기는 운전조건이 엔진 회전속도 2800rpm, 작업속도 1.0m/s일 때 가장 좋은 작업 성능을 보인 것으로 판단되며, 이 때 수집 손실비율 약 2.7%, 배진 손실비율 약 0.5%, 총 손실비율 약 3.1%, 완전립 비율 약 99.3%, 손상립 비율 약 0.2%, 미탈곡립 비율 약 0.0%, 이물질 비율 약 0.2%의 작업 성능과 수확된 나물 콩의 발아세, 발아율은 약 100%, 71.7%를 보여 국외 보통형 콤바인 보다 곡물 손실이 적고, 수확 곡물의 품질도 높아 우수한 작업 성능을 보인 것으로 나타났다. 또한 시험기는 나물 콩의 수확시험 조건이 불량한 상태에서도 재배 폭이 약 2m인 3조 예취 건조 나물 콩을 약 1.0m/s의 작업속도로 수집 탈곡할 수 있어서 유효포장작업능률은 약 50a/h 정도일 것으로 판단되었다.