SU954045A1 - Centrifugal grain cleaning machine - Google Patents

Description

The invention relates to the sorting of bulk materials in relation to the cleaning of seeds of agricultural crops and can be used in the mill, large and mining industries.

A known centrifugal grain cleaning machine, comprising a rotating vertical cylindrical screen with a drive for imparting longitudinal vibrations and a loading device. During the operation of this machine, the grain mixture is loaded into a sieve -. from above and it moves with an annular layer along the inner separation surface of the sieve down. In cars of this. the type of trajectory regarding the movement of particles of the mixture along the inner surface of the sieve during the period of steady-state motion are straight lines parallel to the generatrix of the cylindrical surface u.

The disadvantages of this machine are low productivity and quality of cleaning as a result of insufficient degree of loosening and lack of mixing of particles in the mixture layer, since there are no sieve oscillations, the direction of which would be perpendicular or at an angle to the general direction of motion of the mixture.

A centrifugal grain-grading machine is known, which comprises a loading device, a rotating drive cylindrical sieve with rims and a spiral located inside the sieve. The installation of a helical spiral rigidly fixed to the sieve surface, the thickness of which does not exceed the thickness of one elementary layer of grains, for the intensive extraction of runaway particles in a rotating cylindrical screen provides

5 better performance 2.

However, the known machine does not provide a sufficiently high performance and quality of cleaning the mixture.

20

The purpose of the invention is to increase machine productivity and cleaning quality.

Claims (2)

This goal is achieved by the fact that the helix is fixed on the rims of the hedge, and the latter is equipped with a drive to communicate longitudinal vibrations to it. In addition, from the side of the loading, the helix has a straight line that is parallel to the forming sieve. FIG. 1 schematically shows the proposed machine, a longitudinal section; in fig. 2 - screw helix, fixed on the rim of the sieve (sa: about the sieve conventionally not shown). iMauTHKa contains a stationary casing 1, a drive pulley 2, a vibrator 3, a vertical axis 4, a cylindrical sieve 5 fixed to the outer | Bottom surfaces of the lower 6 and upper 7 rims, to the inner surfaces of which the ends of the spiral helix 10 are rigidly fixed as well as a hole cleaner 11, a grain conduit 12, a receiving chamber 13, disassembling 14 and scrapers 15. On the loading side, the spiral 10 has a straight line parallel to the generator of the sieve 5. The machine works as follows Grain mixture from the grain guide 12 is fed to the receiving chamber 13 , tkuda is gravity fed onto a rotating spreader 14, the centrifugal force applied to the inner surface of the cylindrical sieve 5 and moves along it downwards. The vibrator 3 informs the sieve 5 with vertical axial oscillations and the drive pulley 2 provides rotation. Under the action of oscillations of a rotating sieve - 5 turns of the helix 10 oscillate relative to the inner surface of the sieve 5. Consequently, along with the continuous output from under the entire sorted mixture of off-particles, helix 10 more intensively mixes the lower layer. Beyond the oscillating relative to the inner surface of the sieve 5 of the spiral 10, voids are formed more intensively, which intensively fill the passage particles. A more intensive approach of pass-through particles to the surface of the sieve 5 contributes to their more intensive screening. The execution of the helix 10 on the loading side with the direct end parallel to the sieve 5, ensures the elimination of the coil in the process of separating the helix 10 into the loads and intensively sieving the mixture, which significantly reduces the percentage of passage particles in the gathering fraction, i.e. improves the quality of the separation process. It is known that at the time the mixture is supplied to the inner surface of a vertical vibrating sieve, instability of particle trajectories, i.e. Immediately, the particles begin to move from top to bottom along a straight line parallel to its generator. At first, their trajectories have the form of curves. The very same end of helix 10 in this zone provides a more rapid and uniform distribution of the mixture around the perimeter of the inner surface of the sieve 5, it is obvious that the outer diameter of the spiral helix spiral 10 should be close to the inner diameter 5. Under the action of centrifugal force, the turns of the spiral 10 are pressed against the inner surface of the sieve 5, which ensures the operation of the spiral 10 in the elementary layer of grain on this surface. The slope of the turn of the spiral 10 should be chosen from the conditions for ensuring the best possible process flow. The proposed device provides improved machine performance and cleaning quality, and in addition, reduces the complexity of the work when replacing the sieve. Claim 1. A centrifugal grain cleaning machine comprising a loading device, a rotational drive cylindrical sieve with rims and a spiral located inside the sieve, characterized in that, 9 the purpose of improving machine performance and cleaning quality is that the spiral is attached to the sieve rims and the latter is equipped a drive for imparting longitudinal vibrations to it. 2. A machine according to claim 1, characterized in that on the loading side the spiral has a straight line section which is parallel to the generator of the sieve. Sources of information taken into account in the examination 1. USSR author's certificate 545396, cl. B 07 B 1/26, 1975.. 2. USSR author's certificate 239703, cl. B 07 B 1/24, 1963 f prototype).