SU1042817A1 - Apparatus for sieving loose materials - Google Patents

Description

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The invention relates to the separation of bulk materials on a large scale, in particular, to grain cleaning machines for cleaning and sorting seeds of a selection material of various agricultural crops. . A device for sifting bulk materials is known, consisting of two flat sieves arranged one under the other and cleaning sieve holes, which are balls placed in the space between the LI sieves.

However, in the known device, effective cleaning is not achieved during the reciprocating movement of the sieves.

The closest to the proposed technical essence and achievable effect is a device for sifting granular material, including flat screens placed one under the other and installed with the possibility of reciprocating motion, the lower of which is divided by partitions into compartments filled with cleaning elements. balls in the form of balls 2.

However, this construction does not ensure effective material separation due to insufficient cleaning of the sieve holes.

The aim of the invention is to increase the efficiency of the cleaning process.

This goal is achieved by the fact that in a device for separating bulk material, including flat-screen sieves arranged one under the other, installed with the possibility of reciprocating motion, the lower of which is divided into compartments filled with cleaning elements in the form of balls {outside the sieve equipped with in the transverse direction there are plates, the distance between which, and taKme, the upper edge of the plate and the upper sieve is larger than the diameter of the ball, and the distance between the plates is 1.7-2.5 the diameter of the ball, and the upper sieve has solid sections located above the partitions, whose width is determined by the formula r + 2Vh (d-h)

where t is the width of sections, mm;

 thickness of the partition in the upper part, mm; d is the diameter of the ball, mm; partition distance

and top sieve, mm. FIG. 1 shows a device, a longitudinal section; in fig. 2 - the same, top view.

The device includes flat sieves 1 and 2, driven in reciprocating motion (drive not shown. Sieve 2 is divided by partitions 3 into compartments filled with cleaning elements, for example in the form of balls.

In the transverse direction, plates 5 are installed on the sieve 2, the distance between which is 1.7-2.5 of the ball diameter.

The distance between the top of the plates 5 and the sieve 1 must be greater than the size of the cleaning element (for balls it is larger than its diameter). In this case, the height of the plates 5 allows the cleaning elements to move freely throughout the entire compartment.

Sieve 1 has non-perforated portions 6 located above the partitions, whose width (t) depends on the size of the cleaning element (d) the thickness of the upper part of the partition (S) and the distance between the upper sieve and the partition (h).

The width of these sections can be determined by the formula

t7 / cr-f27h (d-h). .

The operation of the device is as follows.

The sieves 1 and 2 are driven back and forth. Wherein

sifting of granular material occurs. Cleansing elements (balls) Z make oscillatory movements between sieves 1 and 2 and partitions 3, hit the grains stuck in

hole x sieve, clean it.

The presence of plates contributes to the intensification of the movement of the ball k and to an increase in the efficiency of cleaning the sieves.

Phie.

Claims (3)

1. A DEVICE FOR Sifting loose material, including flat sieves arranged one below the other, mounted with the possibility of reciprocating movement, the lower of which is divided by partitions into compartments filled with cleaning elements in the form of balls, characterized in that, in order to increase efficiency of the cleaning process, the lower sieve is equipped with plates mounted on it in the transverse direction, the distance between which, as well as the upper edge of the plate and the upper sieve, is larger than the diameter of the ball. 2. The device according to π. 1, characterized in that the distance between the plates is 1.7.-2.5 the diameter of the ball. 3. The device according to π. 1, characterized in that the upper sieve has solid sections located above the partitions, and the width of the sections is determined by the formula t> cT + 2YR (d-R) ·, where t is the width of the sections, mm; σ ' ¹ is the thickness of the septum in the upper part, mm; d is the diameter of the ball, mm; R is the distance between the partition and the top screen, mm. SU, „, 1042817