Experimental Studies on the Load and Harrowing Characteristics of Puddling Machines (VII)

On Puddling Conditions That Affect the Surface Pressure on the Lugs of the Puddling Rotor

Abstract

The effect of some factors on the surface pressure of the puddling rotor lugs was experimented and the following results were obtained.
The surface pressure measures less than 0.1kg/cm², in the range of natural crumbling, while in the range of crush crumbling it measures 0.7kg/cm² at the maximum.
The maximum value of the surface pressure on lugs of the rotor is recorded in the range of 20°-0°before the lug reaches the lowest point in soil. If the surface pressure is analysed into the horizontal and the vertical components, the former reaches maximum in the range of 20°-0°while the latter in the range of 0°-20°.
The surface pressure on the lug is least when working on dry soil, and increases progressively in the order of moist, semi-moist and semi-dry soil. The soil condition below the crumbling limit is the most appropriate for making the load least and expediting the crumbling of soil.