DE1236266B - Arrangement in threshing machines, in particular in combine harvesters, for transferring the threshed material separated from the threshing device to the cleaning device - Google Patents

Description

GERMAN Wjffls ^ PATENT OFFICE DeutscheKl .: 45 e- 7/44

EDITORIAL

Number: 1 236 266

File number: R 33655III / 45 e

1 236 266 filing date: October 9, 1962

Opened on: March 9, 1967

The invention relates to an arrangement in threshing machines, in particular in combine harvesters, for transferring of the threshed material separated from the threshing device from the grain collecting floor to Cleaning device.

It is already a grain cleaning device in threshing machines with a reciprocating Housing known, which has an upper sieve, a lower sieve and a vibrating floor and an air supply device contains, all of which are in communication with the blower. The material is running out a perforated section of the vibrating floor where small parts are separated out. These are from added to an inclined collecting tray, from which they fall onto the lower sieve, while heavier Parts are conveyed on and unloaded onto the upper sieve. The air supply device is arranged in such a way that that although air is blown through the upper and lower sieve, but that the collecting bottom a Prevents air flow through the vibrating floor. Any deposit that occurs in this part of the cleaning device takes place, only take place according to the aspect of the grain size, wherein the determining factor is the size of the sieve openings; the deposition process is independent on the relative weights of the individual components of the mixture to one another. If the Facility works under normal conditions, most of the grain and small particles can be the chaff get to the collecting floor. However, if the cleaning facility is overloaded, then the top layers of material just stay on top of the bottom layers and it finds no more material separation takes place.

Also known is a cleaning device in threshing machines in which the air flow runs upwards and backwards through the lower sieve, the upper sieve and an adjoining grate-like section. In addition, louvre or adjustable lamellar screens, which are built into the known cleaning device, are part of the state of the art. When adjusting the spaces between the individual lamellas, ie when adjusting the sieve openings, however, a compromise solution with regard to the degree of purity and throughput must be chosen, which has led to the object of the invention. In cleaning devices for threshing machines, two contradicting aspects must be taken into account: The sieve openings should be as large as possible on the one hand, in order to ensure a fast and stowage arrangement in threshing machines, especially in the case of intermittent overloads
in combine harvesters, for transferring the from the
Threshing device separated threshed goods to the cleaning device

Applicant:

RANSOMES SIMS & JEFFERIES LIMITED
Orwell Works,

Ipswich, Suffolk (UK)
Representative:

Dipl.-Ing. E. Kühnemann

and Dipl.-Ing. K. Kühnemann, patent attorneys,

Düsseldorf, Friedrichstr. 71

Named as inventor:
John Stevens Jarvis,

Orwell Works, Ipswich, Suffolk (UK)

free and with relatively short sieves to be achieved throughput of the cleaned grain to ensure; the sieve openings should, on the other hand, be as small as possible to allow air damming underneath the sieve surface and in this way forcing them to enter the area with increased pressure to penetrate the sieve to be classified, which significantly increases the cleaning effect and Avoid falling through or entrainment of chaff and waste, as in the case of large sieve openings will.

The object is achieved according to the invention in that the grain collecting tray a transition part is connected downstream, which is blown through by the cleaning wind and its End of discharge leaving a horizontally extending air gap in front of the end of the discharge downstream upper wire ends. The invention is based on the knowledge that a regarding the degree of effectiveness and purity better classification, especially in the case of a high amount of material to be classified, can thereby achieve that the transfer part to the upper sieve is traversed by the cleaning wind, whereby the material to be classified is separated according to the specific weight, d. i.e., the lighter ingredients are carried into the top layer of the stream of classified material, and that between the discharge end this transition part and the task page of the

709 518/136

Claims (4)

Upper sieve a gap is left into which the cleaning air stagnating under the transfer part flows upwards and in this case transfers the uppermost layer of lighter material to the upper sieve from the already pre-classified material flow falling from the transfer part into the gap. In this way, the problem on which the object is based is solved without having to make the compromise mentioned; In addition, the device according to the invention works perfectly even in the case of prolonged overloads. An exemplary embodiment of the invention is shown in the drawing. It shows F i g. 1 shows a longitudinal section through the rear part of a threshing machine, FIG. 2 shows a plan view of the transition part from the grain collecting base to the upper sieve of the cleaning device, FIG. 3 is an end view of the FIG. 2 shown transition part. The threshing machine has a cleaning device 1 with upper and lower sieves 2 and 3 contained therein; the cleaning device is attached to the machine frame by means of two front control arms 4 and two somewhat longer rear control arms 5. The links 4 and S are movably connected to the machine frame in such a way that the cleaning device can swing back and forth under the driving action of a push rod 6 with eccentric 7. The arrangement of the links in relation to the cleaning device 1 also causes the device to move up and down. A bar 8 runs across the rear end of the upper sieve 2 and carries a finger grate 11. A grain collecting floor 12 is provided for loading the cleaning device with material to be classified, but other conveying devices, for example a link conveyor, can also be used. A fan 13 is used to generate the cleaning wind and blows a stream of air backwards and upwards through the sieves 2 and 3 and the finger grate 11. Below the lower sieve 3 there is a forward and downwardly inclined collecting tray 14 for receiving the grain material falling through the sieve 3 and for conveying it into a funnel 15, from which it is drawn off by a screw conveyor 16. A second base 17 serves to receive material falling through the finger grate and to convey it to a second funnel 18, from which it is withdrawn via a screw conveyor 21 for the purpose of returning it to the threshing device. As shown in FIG. 1, the upper sieve 2, to which a mixture of cereal grains, weed seeds and chaff is fed, comprises two sections, namely a rear section 22 in any conventional shape and a front section 23 in a stepped configuration. These two sections are attached to the cleaning device 1 and experience the same reciprocating motion as this. The front section 23 runs with a gradient backwards and downwards from the plane of the grain collecting floor 12 into the same plane as the rear section 22, but ends at a distance in front of it, so that an air gap is created. In this way, the section 23 forms a transition part from the grain collecting base 12 to the upper sieve section 22. According to FIG. 2 and 3, the transition part 23 has seven steps 24 which are inclined upwards and backwards and are provided with rear air outlet openings through which cleaning wind can flow upwards and grains can fall down onto the lower sieve 3. Intermediate pieces 25 are provided between the steps 24, the lower five intermediate pieces for forming the air outlet openings being arranged at a distance. When the threshing machine is in operation, the threshed grain and weed seeds and the chaff from the threshing drum reach the grain collecting floor 12, on which they advance under the action of the oscillating movement of the cleaning device 1 in the direction of the upper sieve 2. As a result, the material reaches the transition part 23, where it jumps from step to step and is exposed to the air flow of the cleaning wind generated by the fan 13. The wind flows through the openings in the intermediate pieces 25 and then through the classifying material layer, which is loosened with each jump over a step, and the lighter material components are in this way gradually carried into the upper area of the layer. The heavy components, on the other hand, are shifted downwards and already partially fall through the openings in the intermediate pieces 25 onto the lower sieve 3. When the material pre-classified in this way arrives at the discharge end of the transfer part 23, it must overcome the air gap between this and the feed end of the upper sieve section 22, whereby it is subjected to the particularly intensive effect of the pent-up cleaning wind there. This has the consequence that the lighter components already on top are carried by the wind over the gap to the upper sieve 22 and are further classified there, while the heavier components fall through to the bottom and reach the lower sieve. Patent claims: 1. Arrangement in threshing machines, especially in combine harvesters, for transferring the threshed material excreted from the threshing device from the grain collecting floor to the cleaning device, characterized in that the grain collecting floor (12) is followed by a transfer part (23) which is blown through by the cleaning wind and its discharge end below Leaving a horizontally extending air gap before the feed end of the downstream upper sieve (22) ends. 2. Arrangement according to claim 1, characterized in that the spaced opposite end regions of the transition part (23) on the one hand and the top wire (22) on the other hand are arranged at the same height. 3. Arrangement according to claim 1 or 2, characterized in that the transfer part (23) is inclined downwards and backwards in the direction of the upper sieve (22). 4. Arrangement according to one of claims 1 to 3, characterized in that the transition part (23) is stepped and has rearwardly directed openings between the individual steps.