RU2288570C1 - Grain sorting-out method - Google Patents

Abstract

FIELD: agriculture, in particular, post-harvest treatment of grain and seed.

SUBSTANCE: method involves charging grain into cylindrical sorting screen and urging screen to move at rotational velocity of up to 180-190 rev/min during 30-40 min; slowing down rotational velocity of screen by 40-50% of reached value; newly increasing rotational velocity of screen to 180 rev/min, followed by reducing said rotational velocity from this value by 40-50%, and newly increasing said velocity to 180 rev/min; alternating the cycle of reducing and increasing rotational velocity of cylindrical sorting-out screen during the entire period of sorting process.

EFFECT: increased working time for sorting-out process by eliminating screen reversing rotation process.

Description

The invention relates to the field of agriculture and can be used to create new methods for sorting grain and seeds during post-harvest processing of grain crops.

A known method and device for sorting grain and seeds using cylindrical sieves, described in the book of B. G. Turbin and others. "Agricultural machines", M. - L., Mashgiz, 1963, pp. 447-448.

However, a significant drawback of this method and device is that, reaching a certain speed of rotation, it stops isolating fractions as a result of the formation of the so-called "annular layer", when the sieve carries away a layer of seeds and it "sticks" to the surface of the sieve and sorting ceases.

There is also known a sorting method and device for its implementation according to patent RU No. 2242862, 12/27/2004, bull. Number 36. He is deprived of these drawbacks, but a new one has appeared - a large investment of time for dispersal and reversal of sieves, which leads to a decrease in productivity.

The purpose of the invention is to increase the performance of the sieves by reducing the time of reversal and changing the method of sorting.

The essence of the invention lies in the fact that the proposed method of sorting, in which the seeds are loaded into a cylindrical sorting sieve, unwind the sieve to a speed of 180-190 rpm for 30-40 minutes with the separation of grain into fractions, and after reaching the maximum speed of 190 rpm reduce the speed of rotation of the sieve by 40 ... 50% of the achieved, and then again increase the speed of rotation of the sieve to 180 rpm, and then from this level reduce the speed by 40 ... 50% and again increase to 180 rpm and so on alternate cycles of decreasing and increasing the speed of BP scheniya cylindrical sieve sorting throughout the screening time.

New significant features:

1 - after reaching the maximum rotation speed of the cylindrical sieve sieve 190 rpm, reduce the speed of rotation of the sieve by 40 ... 50% of the achieved,

2 - again increase the speed of rotation of the cylindrical sorting sieve up to 180 rpm,

3 - then reduce the speed of rotation of the sieve by 40 ... 50% of the achieved,

4 - again increase the speed of rotation of the sieve to 180 rpm,

5 - such cycles of decreasing and increasing the rotation speed of a cylindrical sorting sieve alternate one after another throughout the entire sorting time.

The above new essential features, together with the known ones, are necessary and sufficient to achieve a technical result in all cases to which the requested amount of legal protection applies.

The technical result is achieved due to the fact that

1 - after reaching the maximum rotation speed of the cylindrical sieve sieve 190 rpm, the rotation speed is reduced by 40 ... 50% of the achieved in order to increase the permeability of the sieves with grain or seeds,

2 - again increase the speed of rotation of the cylindrical screening sieve up to 180 rpm in order to increase the performance of the sieve,

3 - then reduce the speed of rotation of the sieve by 40 ... 50% of what was achieved in order to increase the permeability of sieves with grain or seeds,

4 - again increase the speed of rotation of the sieve to 180 rpm to increase productivity,

5 - such cycles of decreasing and increasing the rotation speed of a cylindrical sorting sieve alternate one after another continuously throughout the entire sorting time in order to maintain the performance of the sieves at this level.

Consider an example implementation of the method. We load the sieve with a grain mixture and spin it to a speed of 190 rpm and after reaching this speed we reduce the rotation speed by 50% to a speed of 95 rpm, and then again increase the speed of the sieve to 180 rpm, then reduce it again by 50% , i.e., to a speed of 90 rpm, and then increase to 180 rpm, and such cycles of increasing and decreasing the rotation speed of the cylindrical sieve screen alternate continuously one after another throughout the entire sorting time. When the cylindrical sorting sieve rotates, the seeds or grain pass through the holes due to the relative movement of grain along the sieve, but with an increase in the rotation speed, the grain passage decreases all the time and reaches a minimum at a speed of 180-190 rpm, therefore, the sieve rotation speed must be changed again and so on. repeated several times.

Technical Results:

- eliminated the phenomenon of "sticking" of the seed layer to the surface of the sieve, which will increase working time and, therefore, productivity,

- an increase in sorting time is obtained due to the fact that there is no reversal process that takes a considerable time, but there is a process of decreasing the rotation speed of a cylindrical sorting sieve, and it takes less time.

Claims (1)

A sorting method, including loading grain and spinning a cylindrical screening sieve with grain separation into fractions, wherein the sieve is unwound to a speed of 180 ... 190 rpm in 30-40 minutes, characterized in that after reaching the maximum speed of 190 rpm they reduce the speed sieve by 40 ... 50% of the achieved, and then again increase the speed of rotation of the sieve to 180 rpm, and then from this level reduce the speed by 40 ... 50% and again increase it to 180 rpm and so on cycles of decreasing and increasing the speed of rotation of the cylindrical sorting sieve continuously one after another throughout the entire sorting time.