sieve shaker
sieve shaker
sieve shaker
It is an object of the invention to design a sieve shaker formed from channels and air guide channels such that a settling of stalk constituents is not produced. Furthermore, guiding of the air in the air guide channels is improved. In turn, the foreign constituents of chaff and stalk constituents is greatly reduced in the sieved harvesting goods.
According to the invention, a sieve is provided for a thresher, especially a combine-harvester, for the separation of grain-like field fruits from stalk-like or chaff-like components defining in the longitudinal direction a longitudinal axis of the sieve. The sieve includes channels, which extend parallel to the longitudinal axis. The channels are open to a first side from which they are loaded, and are delimited by a bottom and laterally following flanks. The flanks include openings. Air guide channels, which are open to a second side, face away from the first side. Two air guide channels, respectively, in a direction transverse to the longitudinal axis, are separated by a continuous separation wall and are arranged between two subsequent channels. The two air guide channels extend parallel to the longitudinal axis. The openings of only one of the two channels, separated by the air guide channels, are open.
Advantageously, the separation wall prevents a stalk portion which penetrates through the openings from reaching the opposed openings. Furthermore, because of the guide possibilities of the blower air, improved by the separation into separated air guide channels, stalk constituents (components) which settle in an opening can be transported away. Therefore, the proportion of foreign constituents is also effectively reduced in the sieve shaker harvested goods.
In an embodiment of the invention, the separation walls have air guide wings at both sides. The air guide wings project into the two air guide channels and approximate the neighbouring flank of the corresponding channel in a conveying direction. The air guide wings create an air flow directed to the neighbouring flank which practically prevents an intrusion of a stalk portion but enables the grains to exit through the openings.
Preferably, the flanks of the channels are represented by intermediate webs, forming between themselves along the longitudinal axis the openings. Thus it is possible to simplify the manufacture of the sieves. Accordingly, depending on the harvesting goods and the harvesting conditions, the intermediate webs can be arranged at a larger or a smaller distance from each other. Thus, finer or coarser sieve shaker can be manufactured from the same components.
In an embodiment, the two air guide channels, separated respectively by a separation wall, are closed towards the first side by at least one roof shaped end plate. Thus, the harvesting goods, loaded from the first side, are guided, via the roof-shape, into the individual channels.
It is advantageous for the intermediate webs to be delimited laterally by guide portions bent in opposite directions in relation to the longitudinal axis. The guide portions extend opposite in an inclined manner in relation to the conveying direction or the longitudinal axis, respectively. Thus, the stalks which are aligned more or less in the longitudinal direction of the channels, supported by the blower air flowing from the neighbouring air guide channel of the channel connected to the openings, are prevented from reaching the openings. These stalk constituents are carried away by the vibrational movement of the sieve out of the channel in the conveying direction.
It is further advantageous for the openings to expand starting from the bottom towards the first side. If, namely, a small amount of harvesting goods or small grain-like harvesting good is in the channel, smaller opening cross-sections are sufficient to achieve a good sieving of foreign constituents from the harvesting goods. However, as soon as more is loaded into the sieve, e.g., the channels are full, which for example is the case with a coarser grain-like harvesting good, the sieve shaker capacity is increased, as the discharge area of the openings is increased.
At least one conveying strip projects over the end plate to the outside of the first side so that larger stalk constituents, which are transported from the first side out of the sieve, do not reach into the channels. The at least one conveying strip is formed with a serration and extends parallel to the longitudinal axis. Due to the conveying strip, the longer stalk parts are transported away, because of the vibration movement of the sieve, without reaching the channel. The conveying strips are suitably formed integrally with the separation walls. Thus, in a sieve combined from the individual components, the conveying strips form practically connection strips which enable other components to be connected to the conveying strips.
In order to use the sieve shaker according to the invention in a universal fashion, for example in the harvesting of small grains such as rape or seeds, a perforated plate is provided. The perforated plate has a multitude of openings and covers the channels. Preferably, each channel is individually provided with a perforated plate. Alternatively, a plate can be provided, which together comprises all of the perforated plates for all individual channels of a sieve. The plate or the perforated plates, respectively are detachably mounted on the sieve shaker. The openings may be adapted in shape and/or size to the goods to be sieved.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
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