ブロードキャスタの散布性能
1973 年 35 巻 3 号 p. 281-287
詳細
1973 年 35 巻 3 号 p. 281-287
1. The existing centrifugal distributors appear to attain uniform distibution of particles by means of placing the feed position whithin the free radius, making the angle between feed pipe and blade by 90 degrees, and putting the flight direction of particles at random.
The writers made an attempt to widen the distribution of particles and distribute them uniformey by fixing the flight position of particles through controlling their fiight direction and falling position.
2. In order to make flight direction exact, the influence of important factors, especially feed position, number of blade, peripheral velocity, kind of fed material, presence or non-presence of blade cover, angle between feed pipe and spinner, and angle between feed pipe and blade, were exemined with a model.
3. The drag angle and the flight direction of particles conincide with theoretical values without suffering the influence of kind of fed material, peripheral velocity, and feed position at all.
4. The number of blade exerts great influence upon the drag angle and the flight direction. The minimum number of necessary blades is decided by the peripheral velocity and the feed position.
5. The angle between feed pipe and blade exerts an influence upon the drag angle. The drag angle tends to increse when the angle between feed pipe and blade is near 90 degrees. The initial velocity of particles is influenced by the degree of the angle between feed pipe and spinner. Generally the bouncing of particles occurs on the spinner when the angle is over 45 degrees. The flight direction can not be controlled in this condition. This phenomenon is changed according to the kind of fed material.
6. The writers made a test machine with several feed positions which could distribute particles in several density curves with normal distibution and attained the resultant of them, on the basis of the above results. Wide and uniform distribution of parfictes was obtained by this new machine without suffering the influence of kind of fed material and spinner speed.
