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초두리밀론 ( Milon Chowdhury ),레자나심 ( Nasim Reza ),알리모하마드 ( Mohammod Ali ),고란닺앗라퐂자만 ( Ashrafuzzaman Gulandaz ),권행주 ( Haing-ju Kwon ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.2
The development of a riding-type automatic onion transplanter could be effective in improving the mechanization rate in onion cultivation, where the working speed analysis plays a vital role and determines planting performance and efficiency. The objective of this study was to select a suitable working speed of a 12 kW self-propelled riding-type automatic onion transplanter for efficient planting of onion seedlings with minimum damage. The proposed transplanting mechanism consisted of six assembling units of picking, conveyors, and rotary planting mechanism, where every rotary planting unit needs a continuous supply of onion seedlings at a certain rate for uniform and upright plantation. To enable the smooth collection and plantation of onion seedlings, analysis was carried out via a mathematical working trajectory model of the planting mechanism, virtual prototype simulation, and validation tests using a physical test bench. In the mathematical model analysis and simulation, the suitable rotational speed was found as 60 rpm and it was able to transplant 60 and 120 seedlings/min using the single and double unit assembly of planting mechanism, respectively. A 130 mm/s forward speed of the transplanter was preferable in terms of seedling uprightness and low damage. A forward speed of 130 mm/s with a transplanting speed of 120 seedlings/min was preferable in terms of achieving a high degree of seedling uprightness. A field test using the real prototype of the onion transplanter would be necessary to verify the accuracy of these findings.
자주식 양파정식기 슬라이딩 메쉬형 기어박스의 동력전달 해석
이슬람나피울 ( Md Nafiul Islam ),알리모하마드 ( Mohammod Ali ),키라가샤피크 ( Shafik Kiraga ),초두리밀론 ( Milon Chowdhury ),권행주 ( Haing-ju Kwon ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.1
An appropriate gearbox selection is essential to avoid transmission losses and convey the engine power to the transplanter components efficiently. Therefore, the objective of this research was to simulate the power transmission of a self-propelled onion transplanter gearbox for calculating the power loss and efficiency. The automatic transplanter power transmission scheme consists of wheels, and dibbling mechanism, and picking mechanism. A computer-aided gear efficiency calculation software package was used to develop a three-dimensional simulation model for the automatic onion transplanter. A V-belt with pulley and nine gear stages sliding mesh type gearbox were used to transmit power from engine to wheel and other transplanter components. The last two gear sets were used as dibbling and picking mechanism gear shafts, respectively. The transmission load was measured at the input shaft of the gearbox, and the driving axle load was measured at the final drive shaft. The load measurements were made at three-speed levels. The input power of the gearbox was 1.7 kW, and the last stage of power (picking scheme) was found as 0.8 kW. The overall efficiency of this gearbox was found as 83.39%. The outcomes of the research would provide a significant reference for the development a power transmission scheme for efficient automatic onion transplanting.