SU1472146A1 - Pneumatic system of grain-cleaning machine - Google Patents

Abstract

The invention relates to devices for cleaning grain mixtures with an air stream from light impurities and can be used in agricultural production and the milling and grain industry. The purpose of the invention is to improve the quality of grain cleaning. Air from the sediment chamber 6 is captured by the blades of the wheel 2 of the diametrical fan 1 and is injected through the air inlet duct 3 into the pneumo-separating channel 4, where the grain mixture is fed through the window 5. At the same time, part of the air from the central part of the wheel 2 is sucked in and pumped by the end sections of the wheel 2 into the air ducts 9, which direct additional air flows along the end walls of the pneumo-separating channel 4, as well as along its outer wall with the window 5 to the grain feed zone. The light impurities separated by the air flow are carried along the pneumo-separating channel 4 into the sediment chamber 6, are deposited on its bottom, and then the device 8 is brought out. The cleaned grain under the action of gravity is lowered down and with the help of the device 7 is removed from the pneumatic system. 2 Il.

Description

Fb / g one

The invention relates to devices for cleaning grain mixtures with an air stream from light impurities and can be used in agricultural production and the milling and grain industry.

The purpose of the invention is to improve the quality of grain cleaning.

FIG. 1 shows a diagram of the pneumatic system of the grain cleaning machine; in fig. 2 - pneumatic system, view from the input side of the grain mixture.

The pneumatic system of the grain cleaning machine contains a diametrical fan

1 with a wheel 2, an air duct 3, a pneumatic separator 4 with a window 5 for entering the grain mixture, a sediment chamber 6 and devices 7 and 8, respectively, for outputting the cleaned grain and for removing light impurities.

The pneumatic system is equipped with two air ducts 9 installed on both sides of the air passage channel 3, the latter covers the central part of the wheel 2 of the diametral fan 1, and the air ducts 9 are mounted so that in the upper part they cover the end sections of the wheel 2 of the fan 1, and in the lower part the parts are connected to the end walls of the pneumatic separation channel 4 below the window 5 for the input of the grain mixture.

Pneumatic grain cleaning machine works as follows.

The air from the sediment chamber 6 is captured by the blades of the wheel 2 of the diametrical fan 1 and is injected through the air inlet channel 3 into the pneumatic separating channel 4, where the grain mixture is fed through the window 5. At the same time, a portion of the air from the central part of the wheel 2 is sucked in and injected with the face sections of the wheel.

2c air ducts 9. The additional air streams thus formed are directed along the end walls of the pneumatic separating channel 4 and along its outer wall with window 5 towards the feed zone of the grain mixture. This compensates for the loss of air velocity due to the friction of air against the walls.

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five

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five

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in the air supply of the shem and pneumatic separating channels, as well as the loss of air flow velocity in the area of the input of the grain mixture, due to the greater density of the mixture located near the wall.

Thus, during the operation of the pneumatic system, the air velocity field is equalized over the cross section of the pneumatic separating channel 4. From the grain mixture exposed to the air flow, light impurities are released, which are transported through the pneumatic separating channel 4 into the sedimentary chamber 6 and are deposited on it the bottom and then the device 8 is outputted out. The purified grain under the action of gravity is lowered and using device 7 is derived from the pneumatic system .;

The advantage of the pneumatic system compared to the prototype is determined as follows. An additional air flow into the pneumatic separating channel, directed along the outer and end walls of the channel under the zone of the input of the grain mixture, ensures the alignment of air velocities over the channel section. As a result, the completeness of the release of light impurities from the grain mixture, i.e. grain cleaning quality is improved.

Claims (1)

Invention Formula The pneumatic system of the grain cleaning machine, which contains a diametrical fan with a wheel, an air supply channel, a pneumatic separating channel with a window for entering the grain mixture, a sedimentary chamber and a device for outputting its fractions, characterized in that, in order to improve the quality of grain cleaning, the pneumatic system is equipped with two air ducts installed on both sides of the air passage, the latter covering the central part of the wheel of a diametrical fan, and the air ducts are mounted so that in the upper part the coverage is vayut end regions of the fan wheel, and the bottom portion connected to the end wall below the window pneumoseparating channel for introducing a grain mix. (pua2