Analysis of feed speed and cutting speed of Korean and Japanese combines using a high-speed camera

Abstract

Cutting performance of 5 row Daedong industry combines cutting knife and 5 row Kuboda combines cutting blade were experimented using paddy straw as the object. Cutting positions were 68 cm left and right from the centre. Cutting performance was measured at three places. The feed rates were 0.6 m/s, 1.1 m/s, 1.6 m/s, and the cutting speeds were 600 RPM, 990 RPM, 1,380 RPM. Each of the speed-specific cutting shapes were measured three times and repeated 3 times. Steps of cutting the straw shape, angle and the number of none cutting and biting were quantified by measuring the total of three. The difference between the smallest straw size and the highest straw size was measured. The distance between the highest straw and the lowest straw was calculated to obtain the angle. The number of truncated and broken straw was measured to quantify the cutting shape. The optimum feed rate and the cutting speed of Korean and Japanese combine were identified according to the cut shape, by using a high-speed camera. If the feed rate and cutting speed were increased, number of cutting was lower; thus there was a less load on the cutting blade between the blade and the cutting target, and the cutting shape was not clean. However, when the feed rate and the cutting speed were lower, the cutting shape was clean, but much higher cutting force was exerted and higher power was consumed, which was a burden on the combine.