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김치생산용 알타리무 전처리가공시스템 개발(II) - 평면형 삭피칼날의 최적형상 -
민영봉,김성태,강동현,Min Y. B.,Kim S. T.,Kang D. H. 한국농업기계학회 2005 바이오시스템공학 Vol.30 No.3
In this study, peeling test of the Altari radish on kimchi pre-processing system for mechanization was performed with the longitudinal plane peeling type with wider cutting blade than that of the peeled chip's. To determine the optimum cutter shape to match this plane peeling type, the peeling tests depending on variable cutting speed, rake angle and blade angle using the blade with thickness as 2 m and width as 50mm were performed, and the patterns of the peeled chips and peeling resistances were investigated. As the result of the tests, the rake angle of the blade with clean peeled surface of the Altari radish was over $45^{\circ}$, and the blade angle and rake angle with the minimum peeling resistance was $20^{\circ}\;and\;60^{\circ}$, respectively. The optimum peeling conditions were; the peeling speed 0.2m/s, blade angle $20^{\circ}$ and the rake angle $60^{\circ}$, and the peeling resistance of each blade was 15 N.
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121김치생산용 알타리무 전처리가공시스템개발(4) - 시작기의 자동화 평가 -
민영봉,김성태,문성원,강동현,정태상 한국농업기계학회 2006 바이오시스템공학 Vol.31 No.2
An Altari radish pre-processing system, which feasible to process automatically such operations as leaf and root tail cutting and root peeling, for kimchi production was accomplished based on the foregone serial studies. In this study, the performances of the developed prototype machine, considered as a commercializing level, were analyzed and evaluated. The prototype machine attached Tiny PLC automatic control system was performed the sequent function as the rate of successful peeling was more than 98% for the Altari radish less than 70 mm diameter of a radish. The operating efficiency of this was 9 sec/each, 128 ㎏/h, and it means as much as 5~6 times that of a woman labor's. The sanitation and taste of the mechanized-processed Altari radish kimchi was almost same as that of the handmade. And they were suitable for manufactory of kimchi as the both short term ripening and storing kimchi.Developed machinery with one peeling device and two peeling devices that compared with hand processing, it was analyzed that the break-even yearly working days were 28 days and 19 days, and the break-even yearly processing amount were 28,700 ㎏, 32,400 ㎏, respectively.
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양파정식기 개발: 4절링크-캠 방식 식부장치의 성능분석 및 최적형상 구명
민영봉,강정균,유찬석 경상대학교 농업생명과학연구원 2016 농업생명과학연구 Vol.50 No.4
본 연구에서는 양파정식기의 정식시 개공기와 토양 간 상대속도를 최대한 0으로 근접시키기 위해 4절 링크-캠 기구를 갖는 정식시험장치를 제작하여 정식시험을 실시하고 최적 작업조건 및 형상을 구명하였 다. 시험조건은 모종나이 50일, 주간거리 130, 140, 150mm, 정식속도 45, 50, 55, 60No/min, 토양수 분함유량 10, 20, 30%, 토양 관수 후 경과 일 수 1, 2, 3, 4일로 하였다. 시험결과 정식률은 주간거리 140mm와 정식속도 50∼55No/min에서 100%로 가장 높게 나타났다. 식부자세는 사질양토에서 주간거리 140mm, 정식속도 50No/min일때 평균 11.2±13.9°로 가장 안정적인 자세로 정식하였고 개공폭은 38.2±1.9mm로 가장 작게 나타나 식부개공기 직경 34mm보다 4.2mm밀림이 나타났다. 최대하중평균은 정식속도 60No/min, 주간거리 150mm일때 45.1±5.1N로 나타났고, 최대정식동력은 124.2±11.8W로 나 타났다. 토양수분함유량은 30%일때 가장 낮았고, 관수 후 1일차가 가장 낮았다. 개선된 4절링크-캠 방 식 식부장치는 주간거리 140mm에 맞는 캠 형상을 갖게 함으로서 개공기-토양 상대속도가 0이 될 수 있었다. 따라서 본 양파정식기 식부장치는 필요 주간거리에 맞추어 상대속도 0의 캠 형상을 갖게 함으 로서 식부성능을 최대화할 수 있는 것으로 판단된다. The onion transplanting equipment with 4 bar link-cam type of transplanting device, which relative velocity between hopper and field soil close to 0 was manufactured and tested to investigate the optimum operation conditions. The test conditions of seedling age, row space and planting speed were 50 days old, 130, 140 and 150mm and 45, 50, 55 and 60No/min respectively. From the test, the row space of transplanting close to 0 of the relative velocity was 140mm, the row space of 140 0mm and planting speed of 50No/min have the highest planting success of 100%. The percentage with plant tilt over 45° to have the growth trouble was 0% and 40.9% respectively in sandy loam and clay field soil. The planting hole width made by hopper was not different between both soil and 38.2±1.9mm at 140mm of row space due to 3.1mm sliding of hopper. The penetration resistances of hopper were 45.1±5.1N, 58.6±5.6N and Max. transplanter power were 95.5±10.7W, 124.2±11.8W in both soil. When the soil moisture content of 30% and day 1 after watering, Max. transplanter power was the lowest. Thus, the transplanting performance of the 4 bar link-cam type transplanting device could be possibly maximized by using a particular cam structure which is able to adjust the relative velocity between the hopper and the ground to approximately zero.
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마이크로 컴퓨터를 이용(利用)한 엔진성능(性能) 측정장치(測定裝置) (I)
민영봉,김용환,이기명,허승도,Min, Y.B.,Kim, Y.H.,Lee, K.M.,Huh, S.D. 한국농업기계학회 1986 바이오시스템공학 Vol.11 No.1
In order to collect the engine performance data accurately, rapidly and reliabily, the microcomputer-based engine performance test system was developed and tested. The system measures engine shaft torque and speed, fuel consumption, exhaust gas temperature, engine shaft power and fuel consumption ratio. The system consisted of 32 channels 8 bit A/D converter, time clock, dynamic strain amplifier and signal conditioning circuits to amplify and filter the electrical signal from transducers. Most of transducers were devised for low cost, easy setting and self-manufacturing. The system has been installed on a small kerosene engine (DAEDONG NA50B).
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마이크로 컴퓨터를 이용(利用)한 엔진회전속도(回轉速度) 제어(制御)에 관한 연구(硏究)
민영봉,이기명,Min, Y.B.,Lee, K.M. 한국농업기계학회 1986 바이오시스템공학 Vol.11 No.1
Speed control of kerosene engine by the combination of a manual throttle and centrifugal weight type governor is not adequate for evaluating energy requirements in laboratory and field performance tests. This paper describes an engine speed control system. This system consists of Apple-II microcomputer, step motor set to the throttle shaft directly, step motor driving and interfacing circuit, engine performance data acquisition system for measuring load, speed and time and potentiometer as speed adjustor. The performance of this system was successful in maintaining engine speed within ${\pm}37$ rpm of reference speed indicated by computer and potentiometer.
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