SU904809A1 - Apparatus for pneumatic cleaning of grain mixture - Google Patents

Description

(54) DEVICE FOR PNEUMATIC CLEANING OF GRAIN MIXTURE

one

The invention relates to agricultural machinery, in particular to machines for cleaning and sorting seeds in stationary conditions and in relation to a combine harvester.

A known device for pneumatic cleaning of a grain pile, including a cylindrical body with a diffuser installed in it, a pressure fan connected by a duct to the body, a suction fan connected to the diffuser 1.

A disadvantage of this device is the low separation efficiency of the grain mixture.

The closest in technical essence and the achieved result to the proposed is a device for pneumatic cleaning, including a cylindrical body, inside which is installed a confuser connected to the throat of a suction fan, charging device, discharge fan, connected by an air duct to the body, a conical screen-reflector, located in the lower part of the housing 2.

A disadvantage of the known device is that the grain heap moves in the annular air cleaning channel only under the influence of a stream of air supplied by an injection fan. With

In this respect, the capacity of the injection fan must be strictly related both to the supply of a grain of grain and to the capacity of the suction fan. This makes it difficult to choose the optimal

10, since with an increase in the supply of heaps, an increase in the productivity of the injection fan is required, which leads to an increase in the contamination of the cleaned grain with straw impurities. When the productivity of the discharge fan decreases, the grain heap is distributed unevenly in the annular air cleaning channel, moving in a thick layer, which leads to an increase in grain losses. In addition, the grain trapped in the cavity of the confuser, reflected from its walls, falls into the central part of the upward air flow and is more rapidly carried away in losses than the grain located in the peripheral zone near the confuser wall.

The purpose of the invention is to intensify the separation by pre-cleaning

and uniform distribution of the grain mixture throughout the hull.

The goal is achieved by the fact that the part of the confuser, facing the screen reflector, is made rotating and provided with blades.

The blades are made corrugated.

FIG. 1 schematically shows a device for pneumatic cleaning of a cereal mixture; in fig. 2 shows an embodiment of the outer blade.

A device for pneumatic cleaning of a cereal mixture consists of a cylindrical body 1 inside which there is a confuser, including a stationary part 2 connected to the suction neck of the fan 3, and a rotating part 4 with blades 5. The blades 5 can be made in the form of corrugations 6. In a cone reflector 7 is installed in the lower part of the body. The confuser is driven from the chuck 8. The material is fed through the loading device 9 ..

A device for pneumatic cleaning of the grain mixture works as follows.

The material by the loading device 9 is fed tangentially into the body, where it is caught by the blades 5 attached to the rotating part of the confuser and distributed evenly over the body 1, the material being unwound, the pile is redistributed due to centrifugal forces: the grain is separated from They are pressed against the hull, and the straw is placed under the grain layer on the side facing the vertical axis of the device. When straw impurities come off the blades, they are picked up by an air flow passing through the gaps of the composite cone and carried to the confuser, and the grain of the cone goes down into the mouth of the reflector cone and is taken out of the cleaning limits. Separate grains, interlaced between impurities, are carried away by the air flow into the confuser, where due to the rotation of the latter they are pressed against the walls of the confuser and due to forces. Acting

the particle located on the rotating conical surface is removed from the confuser, which leads to a reduction in losses. The straw particles are discarded towards the highest airflow rate and are carried by the suction fan out of the cleaning limits. In the case of installation of corrugated blades, material separation begins already on the blades, since the grain sinks into the corrugations, and larger straw particles are placed on top of the corrugation, therefore, the previously distributed mass enters the annular channel of the cleaning body, which makes it possible to further intensify the process of separation of grain heap .

The use of a pneumatic, cleaning device allows to intensify the process of separation of the grain mixture.

Claims (2)

1. A device for pneumatic cleaning of a cereal mixture, including a cylindrical body, a loading device, a confuser connected to the throat of a suction fan, a tapered screening device located in the lower part of the body, and unloading devices, characterized in that, in order to intensify the separation due to preliminary cleaning and uniform distribution of the grain mixture throughout the body; a part of the confuser, facing the reflector screen, is made rotatable and provided with paddles. 2. The device according to claim 1, characterized in that the blades are corrugated. Sources of information taken in in: shmaniye during examination 1. USSR author's certificate JQ No. 603435, cl. B 07 B 4/00, 1975. 2. USSR author's certificate No. 405605, cl. B 07 B 4/00, 1972 (prototype). phage. figure 2.