Substantiation of deck parameters of rotary threshing device

Abstract

The damages of corn grain during threshing depend on many factors, the main of which is timely removal of grain from the threshing chamber what depends on the design of the deck. The functional parameters of the deck in self-propelled combines and stationary threshers used for threshing of seed corn have been studied. Studies of factors affecting the separation process of a mixture consisting of grain and other parts of corn cobs in the threshing chamber were carried out. It has been proved that the shape, size and layout of the deck holes have the greatest impact on the timeliness of the output of the threshed corn grain from the threshing chamber. In this case the deck should consist of three parts of different lengths: 1) a part of the deck of the chamber of the primary damage of the integrity of the cob grain structure; 2) the deck part of the main threshing chamber; 3) the deck part of the finish threshing chamber. The evaluation criteria for choosing the lengths of the deck parts are the average of the double ratio of the linear dimensions of the corn grain of the six main subspecies and the maximum length and diameter of the cobs of 65 main varieties cultivated in Russia. The ratio of the lengths of the first two sections of the deck should correspond to the Fibonacci golden section-1.618 and the double ratio of the linear dimensions of all three sections-1.29. The studies have evaluated the effect of the shape of the holes: round, round lunate, square, rectangular, and hexagonal. At the same time, the pattern of holes on the hexagon and the square and the square holes, additionally, at an angle 45 º to the rotor axis was studied. The feasibility of using round holes in the deck with a diameter of at least 10…14 mm has been established. As a result of using the deck of the proposed design, the conditions for timely removal of threshed grain from the threshing chamber with a reduced probability of damage are created.

Methodology and results of experimental determination of corn grain elasticity modulus

“…To determine the Young's modulus, the most scientific interest is the last bend of the curve before the beginning of endosperm deformation, since here the limit of elasticity of the material of the protective fruit shell of the grain is reached. Numerical values of resistance in this area are useful for the Young's modulus calculation by expression (1). The results of the Young's modulus calculation are presented in the form of four intervals of the numerical scale in Fig.…”

“…In addition to high yields, corn is distinguished by the presence of a number of subspecies characterized by various mechanical, technological and taste characteristics. In particular, the main industrial subspecies include dent corn, flint corn, sugar corn, flour corn, waxy corn and popcorn [1].…”

Low-Damage Corn Threshing Technology and Corn Threshing Devices: A Review of Recent Developments

“…The damage rate and the corn threshing rate can be balanced by reasonably adjusting the concave clearance and the speed of the threshing cylinder, so as to achieve the lowest loss rate. Bakharev D. et al [46] studied the factors influencing the separation effect of mixtures composed of corn kernels and other impurities such as corn cobs. The results suggested that the most influential factor was the threshing time of corn kernels.…”

Study of seed corn threshing process

“…In the process of solving the problem of minimizing the number of macro -and micro-damages to seed grain corn during threshing, an axial-rotary threshing device with pneumatic adaptive deck was theoretically justified and designed, the design and operation of which are described in detail in the source [1].…”