SU1475730A1 - Screen - Google Patents

Abstract

This invention relates to a technique for transporting and separating a root-and-vegetable crop. The purpose of the invention is to improve the quality of separation by providing separation of large impurities from the roots. The screen contains two sieves (P) installed on the suspensions, oscillating in antiphase and made of grates (K) 4-6, forming longitudinal trapezoid trenches (W). They are installed stepwise in height, with a decrease in height to both sides of the longitudinal axis of symmetry R. The contouring large base of the K 4 trapezium is located in the inclined P planes intersecting in the longitudinal axis of symmetry and are common to the adjacent sides of the trapezium. The other K 4-5 and 6-6 trapezoidal X are arranged in pairs in horizontal parallel planes. Roots with an axis of symmetry, are located in W and move along the length of the screen K 4-6, forming a symmetrical trapezoid part of G. Small impurities spill into the gaps between K 4-6. Due to their irregular shape, large impurities move downward from one G to another under the action of transverse oscillations and are dropped from the surface of P. 2 Il.

Description

114

The invention relates to a device for classifying material according to size, intended for transporting and separating loose material, preferably root and fruit harvesting.

The purpose of the invention is to improve the quality of screening.

FIG. 1 is a side view screen; in fig. 2 is a view A of FIG. one .

The screen contains oscillating out-of-phase sieves: front 1 and rear 2, mounted on suspensions 3 and composed of grate 4-6, and drive 7. The grate 4-6 form longitudinal trapezoid gutters. The gutters are installed stepwise in height with a decrease in height in both. The sides of the longitudinal axis of symmetry, respectively, of each of the sieves 1 and 2. The columns 4, outlining the larger base of the trapeziums, are located in the inclined sieve intersecting in the longitudinal axis of symmetry of the planes P1 and P and are common to adjacent sides of the trapezium, 4–5 and 6–6 trapezoid gutters are arranged in pairs in horizontal parallel planes.

Grate bars 4-5 - 6-6 form a symmetrical part of a trapezoid trough with lower bases c and upper b. The grate 4 forms an inclined base of the trapezium and at the same time is common to the long side of the trapezium formed by the grate 4-6 and short 4 and 6.

The roar works as follows

The transported mass, predominantly root-harvesting, together with soil impurities, lumps, stones is fed in the receiving part to the zone of the longitudinal axis of symmetry of the sieve 1, and then the sieve 2, where it is distributed across the width of the vibrations. In this case, the quantity of the fed mass is regulated by its feeding and corresponds to its uniform distribution over the width of sieves 1 and 2. In the case when the crop is observed to roll away from the re-

Sheta 1, reduce the flow, and with its lack - increase.

The root-harvesting mass, 55 as a mass having an axis of symmetry, is located in the grooves and moves along the length of the screen by the grate bars 4, 5.6, forming a symmetrical tract

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part of the gutter. In the process of vibro-transport, this part of the mass is oriented relative to the longitudinal axis of the chute and does not have transverse displacements. It is moved along the axis of the troughs of the screen.

Another part of the impurity mass, earth and stones, forms two fractions, small and large. The small part of impurities spills into the gaps between the grate bars, and the large part remains in the trenches of the screen. Under the action of vibration, the coarse fraction is thrown upwards and at the same time transversely oscillates. Transverse oscillations are caused by an irregular shape of lumps and the absence of an axis of symmetry. As a result of transverse displacements, staggered gutters and unequal sides of the trapezium, transverse movements of large impurities from one trough to another are carried out in a downward order and dumped from the sieve screen surface along the edges. Thus, all large impurities are ejected from the mass roots and tubers in the process of moving them through the sieves 1 and 2 of the rumble.

The sieves 1 and 2 of the screen simultaneously produce the separation of the fine fraction through the gaps of the grates 4, 5, 6 and the separation of large impurities from the pile of mass by their transverse displacement from one chute to another in descending order, and the discharge from sieves 1 and 2 along the edge m, as well as transportation of root crops along the screen and dumping them through the end surface of the sieve 1 and 2.

The installation of the grooves in steps in height with a decrease in both directions from the longitudinal axis of symmetry of sieves 1 and 2 ensures the separation of the transported mass into two streams: left and right. Large impurities in the left side of the mass moving to the left, and impurities in the right side

the parts are to the right, do not cross each other and do not double back. This provides the best passable ability of large impurities on sieves 1 and 2 of the screen and the quality of mass cleaning.

The arrangement of the grate 4, which forms the large base of the trapezium, in the inclined intersecting planes P, and P2, forms a slide conducive to the rolling and transfer of large

impurities from the above located screens in the downstream and eventually to eject them from the surface of sieves 1 and 2. This effect is also due to the fact that the sides of the trapezium facing the axis of symmetry of the screen are larger in width than the sides in the opposite direction .

The belonging of the grate 4 to the larger and smaller side simplifies the construction of the sieve, creates completeness and improves the handling of large impurities through them from one trough to another.

The arrangement of the bases with and t formed by the grates 4, 5 and 6 parallel to the planes horizontally relative to the surface of the base ensures the symmetry of the trapezoidal grooves, the centering of the root and tuber crops located in them and stable movement without transfer from one groove to another along the

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sieves 1 and 2 screens and discharge from their end part.

Claims (1)

Invention Formula The screen, including two sieves placed on the suspensions and installed with the possibility of oscillation in antiphase, consisting of grates, forming longitudinal trapezoid trenches, and a drive, characterized in that, in order to improve the quality of screening, the trapezoid trenches are installed in steps along the height in both storbny from the longitudinal axis of symmetry of the sieves, while the grate bars that surround the large base of the trapezium are placed in inclined sieves of planes that are common to the longitudinal axis of the sieve; The adjacent sides of the trapezium, and the other grate trapezoid gutters are arranged in pairs in horizontal-1 planes. Editor I. Segl nick Compiled by B. Levchayev Tehred A. Kravchuk Proofreader M. Demchik Order 2106/12 Circulation 543 VNIIPI State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-3G, Raushsk nab. 4/5 -B-4-b ®ig.2. Subscription