不同旋耕刀的转矩变化与耕作比能

本文研究了在泰国常见的3种旋耕刀（日式C型刀片、欧式C型刀片以及欧式L型刀片）的转矩特性和耕作比能，以便开发一种适合于泰国播前整地的旋耕刀。在实验室土壤槽中进行了相关试验，在沙质壤土和粘质土壤中，刀片的前进速度分别为0.034、0.069m/s，而转速为150、218、278和348r/min。结果表明，刀片的形状影响转矩特性和耕作比能。对于日式刀片，由于是其纵向弯曲部分先耕土，耕作转矩的增加比其他两种刀片要小。对于欧式刀片，延纵向和顶端的弯曲部分首先作用于土体。转矩的周期性变化非常明显，对于两种欧式刀片更是如此。试验表明，日式C型刀片的耕作比能最高，而欧式L型刀片的耕作比能最低。 

Variations of Torque and Specific Tilling Energy for Different Rotary Blades

The torque characteristics and the specific tilling energies of three commonly used rotary blades in Thailand, i.e. the Japanese C-shaped blade, the European C-shaped blade and the European L-shaped blade, were studied to develop a suitable rotary blade for seedbed preparation in Thailand. The experiments were carried out in a laboratory soil bin at forward speeds of 0.034, and 0.069 m/s, and rotational speeds of 150, 218, 278 and 348 r/min (or 3.30, 4.79, 6.11 and 7.65 m/s) in sandy loam and clay soils. The results showed that the shape of the rotary blade influenced the torque characteristic and the specific tilling energy. For the Japanese blade, since its lengthwise curved portion tilled the soil first, the increase of tilling torque was less than the other two blades. For both European blades, the curved portion along the length and the tip was the first to impact the soil mass. The cyclic variation in torque could be observed distinctively, especially, for both European blades. The investigations indicated that the specific tilling energy of the Japanese C-shaped blade was the highest while the specific tilling energy of European L-shaped blade was the lowest.