Intermittent interception type grain two-way vibration cleaning device

Abstract

The invention discloses an intermittent interception type grain two-way vibration cleaning device. The intermittent interception type grain two-way vibration cleaning device comprises an upper screenmechanism, a frame, transmission mechanisms, vibration mechanisms and a lower screen mechanism; the upper screen mechanism is fixed above the frame; the lower screen mechanism is fixed below the frame; the transmission mechanisms are fixed at the externals of two sides of the frame; the vibration mechanisms are fixed in two sides of the frame; an interception sleeve is embedded in a limiting sleeve; a vibration spring is fixed below the external of the interception sleeve; the vibration spring supports the limiting sleeve to perform a reciprocating motion in the vertical direction; a stop shoulder is positioned at the upper part of the interception sleeve; a base hole is positioned at the lower part of the interception sleeve; when the stop shoulder is leveled with the upper surface of a first fixed screen plate, an interception function is exerted; when the stop shoulder of the interception sleeve is leveled with a second movable screen plate, the interception function is closed; andthrough a reciprocating motion of a guide rod, the upper screen mechanism and the lower screen mechanism are urged to generate reciprocating motions in the horizontal direction and the vertical direction to drive the spring to buffer the vibration impact. The intermittent interception type grain two-way vibration cleaning device improves the operation stability, and reduces the grain cleaning lossrate and the impurity rate.

Description

technical field [0001] The invention relates to an agricultural machine, in particular to an intermittent interception type grain two-way vibration cleaning device. Background technique [0002] The cleaning device is the key device of the grain combine harvester. Its function is to distinguish the threshed grains and straw residues, etc., and to collect the grains cleanly and without loss. It has a direct impact on quality and yield. At present, the grain cleaning devices at home and abroad are mainly composed of a single-layer cleaning screen and a four-bar linkage mechanism; among them, the cleaning screen usually has a punching screen and a fish-scale screen. The type is higher than the base surface of the sieve plate; the larger the sieve hole of the punching sieve, the better the grain passability, but the impurities will also pass through, resulting in an increase in the impurity rate of the grain and affecting the quality of the grain. The smaller the hole, the eas...

AI Technical Summary

Problems solved by technology

At present, the grain cleaning devices at home and abroad are mainly composed of a single-layer cleaning screen and a four-bar linkage mechanism; among them, the cleaning screen usually has a punching screen and a fish-scale screen. The type is higher than the base surface of the sieve plate; the larger the sieve hole of the punching sieve, the better the grain passability, but the impurities will also pass through, resulting in an increase in the impurity rate of the grain and affecting the quality of the grain. The smaller the hole, the easier it is to be blocked by debris, thereby reducing the passage of grain; the mesh of the fish scale sieve is at a fixed angle to the base surface of the sieve body, and it is difficult to adapt to the grain with different moisture content when the cleaning flow field changes. grain separation trajectory, at the same time, the fixed sieve hole angle is very likely to cause debris blockage, thereby reducing the grain cleaning function; in addition, the four-bar linkage mechanism has too much movement impact inertia, which reduces the operating stability of the cleaning device, which only It can realize reciprocating motion in the horizontal direction, and the screening acceleration of grains and impurities is single, resulting in low cleaning and separation efficiency of grains

It can be seen that the sieve structure and driving type of the cleaning device seriously affect the quality and efficiency of grain cleaning, which can easily cause sieve blockage and grain loss, and threaten the operation reliability of the cleaning device

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