• 한국기계가공학회지
• /
• 제14권3호
• /
• pp.27-35
• /
• 2015

Recently, the work machine is widely used in the agricultural machine and to use the power source of the tractor, the mower had been widely used as a working machine for mowing. The mower is classified as a front mower, mid-mower, and rear mower according to the mounting position of the lower frame on tractor. The main structure of mower is composed of deck, gearbox, and blade. This study concerns a study on air flow characteristics of Mid-mower for tractor. An air flow characteristics of the Mid-mower deck was evaluated by the velocity vector, flow path, and total air flow according to the number of revolutions. As the analysis results, The inner path of designed deck had no effect on air flow.

• 한국기계가공학회지
• /
• 제15권5호
• /
• pp.80-85
• /
• 2016

In recent years, work to improve the power of a tractor has been in development. This study, using the mid-PTO power of a compact tractor, attempted to develop a high-speed mid-mower by setting the rotation to more than 3,000 RPM designed/manufactured major components of the high speed mid-mower. The performance of high-speed mid-mower was evaluated by the precision of straight bevel gears, and durability, the noise of the gearbox, the gearbox internal temperature, the maximum rotation speed of the mid-mowers, and the grass cutting test. Through the performance test results, the maximum number of revolutions of the mid-mower was measured over 3,000RPM, the gearbox noise and gearbox internal temperature satisfied the performance requirements of a high speed mid-mower.

• Journal of Biosystems Engineering
• /
• 제39권4호
• /
• pp.253-260
• /
• 2014

Purpose: This study investigated the harvesting properties of the giant miscanthus (Miscanthus ${\times}$ giganteus) to measure the required mowing power for different stem conditioning methods in order to shorten the drying time after mowing and the bale density so that the crop can be used as biomass in the winter season. Methods: The required mowing power and bale density were measured using a power measurement device, three different mower-conditioners, and a mid-sized round baler under different working speeds and conditioning methods. Results: For the various mower-conditioners, the average stem length from mowing was 0.86-0.91 m, and the available working speed was 1.6 m/s. The steel roller-type mower-conditioner showed better stem conditioning but could not mow over a working speed of 1.6 m/s. The required average power of the mower-conditioners varied from 23.8 kW for the steel roller-type rotary disk mower-conditioner with a working width of 2.4 m to 37.2 kW for the flail-type rotary disk mower-conditioner with a working width of 3.2 m at a working speed of 1.6 m/s. The bale densities were $155.8-172.2kg/m^3$. The highest bale density was measured for stems with no conditioning and a moisture content of 11.3% (d.b.) mowed by the rotary disk mower. The bale density was affected by the mowing method because of the low moisture content of the miscanthus stems. Conclusions: In terms of the working performance and conditioning statue, the steel roller-type mower-conditioner is a better choice at a working width of 2.4 m, while the flail finger-type mower-conditioner is better at a working width of 3.2 m. The type of mower-conditioner used for giant miscanthus harvesting should be determined by considering the harvest area, workable period, and working performance of a mower-conditioner and baler during the winter.

• 한국작물학회지
• /
• 제61권3호
• /
• pp.215-221
• /
• 2016

바이오에너지용 억새의 트랙터 부착 수확기 등 중장비 동원 늦은 수확에 따른 부작용을 구명하기 위해 전년도 생육 줄기의 늦은 수확 시기별 당년 생육특성과 마른줄기 수량을 구명한 결과는 다음과 같다. 1. 시험포장의 지하 10 cm 토양 경도는 맹아시, 맹아기, 맹아종 수확에서 각각 650, 793, 735 kPa로 일정한 경향이 없었으나 지하 20 cm에서는 각각 741, 915, 1,045 kPa로 늦게 수확할수록 단단해 졌다. 2. 이질 3배체에 비해 거대1호가 생육시기별 경수의 변이폭이 컸다. 거대 1호는 수확 시기별로 가장 늦은 맹아종에서 생육중기(5월 22일)에 169개/$m^2$로 가장 많았으나 생육 최성기(7월 22일)에 70개/$m^2$로 급격히 감소하였다. 3. 수확시기가 늦을수록 당년 생성된 지하경이 전년의 것에 비해 가늘어져 맹아종 수확에서 전년, 당년생성 지하경태가 거대 1호는 각각 9.2 mm, 6.7 mm 이질 3배체는 각각 8.5 mm, 8.0 mm였다. 4. 수확시기가 늦을수록 경장이 작아지고 아울러 줄기수량도 감소하였다. 거대1호와 이질3배체의 경장은 맹아시 수확에서 각각 308 cm, 374 cm였으나 맹아종 수확에서는 각각 268 cm, 341 cm로 작아졌다. 줄기 수량 또한 맹아시 수확에서는 각각 1,440 kg/10a, 1,777 kg/10a였으나 맹아종 수확에서는 각각 847 kg/10a, 963 kg/10a로 크게 감소하였다. 5. 출수율은 거대 1호의 경우 맹아시 수확에서 3.9%로 극히 낮았고, 맹아기 및 맹아종 수확에서는 거의 출수되지 않았다. 이질3배체는 맹아시 수확에서 49.6%였고, 맹아기, 맹아종에서도 각각 40.6%, 21.8% 수준을 유지하였다.