combine harvester threshing device
The threshing device with a receiving net and stirring body addresses grain loss by separating small grains from cereal straw, enhancing grain collection efficiency and managing stalk intake, thus reducing harvest loss.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ISEKI & CO LTD
- Filing Date
- 2024-11-15
- Publication Date
- 2026-05-27
AI Technical Summary
Existing threshing devices in combines fail to effectively separate small grains from cereal straw, leading to grain harvest loss as they are discharged outside the machine along with the straw.
A threshing device with a threshing cylinder surrounded by a receiving net and a stirring body that intersects the rotational trajectory of the threshing teeth, breaking up clumps and sending loose grains to a sorting chamber for collection, while allowing adjustable intersection to manage grain stalk intake.
The solution effectively recovers loose grains, reducing harvest loss by ensuring small grains are collected and not discharged with the straw, and adjusts to varying grain stalk loads without increasing the threshing drum's driving load.
Smart Images
Figure 2026087143000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a threshing device of a combine that harvests grains by cutting cereal straw growing in a field and threshing the grains with a threshing device mounted on the machine body.
Background Art
[0002] A threshing device of a combine is described in Japanese Patent Application Laid-Open No. 2023-62543 with a configuration for improving the grain harvest amount.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In order to prevent the grains in the threshing treatment material from being mixed and directly discharged outside the machine together with the discharged straw and the like in the handling chamber that separates the grains from the cereal straw, a plate-shaped resistor that approaches the tip rotation locus of the handling teeth erected on the handling cylinder and gives a moving resistance to the threshing treatment material is provided in the handling chamber to separate the grains (small grains) contained in the threshing treatment material. In this configuration, since the threshing treatment material moves in the handling chamber in a块状 form, the plate-shaped resistor outside the tip rotation locus of the handling teeth has a weak effect of breaking the块状 threshing treatment material, and the separation of the small grains is not sufficient and is sent to the end of the handling chamber in a块状 form and directly discharged outside the machine, resulting in a grain harvest loss. In particular, this grain harvest loss often occurs in the threshing device of a general-purpose combine in which the entire cereal straw with ripe grains is fed into the handling chamber and threshed.
[0005] Therefore, an object of the present invention is to increase the grain harvest by eliminating the small grains that are discharged outside the machine together with the threshing treatment material in a combine that harvests grains by cutting cereal straw growing in a field and threshing the grains with a threshing device.
Means for Solving the Problems
[0006] The problems of the present invention described above are solved by the following technical means.
[0007] The invention of claim 1 is a threshing device for a combine harvester in which a threshing cylinder 11 with threshing teeth 16 erected on it is mounted on an axis inside a threshing chamber 10 of the threshing device 4, the lower side of the outer circumferential surface of the threshing cylinder 11 is surrounded by a receiving net 12 in an arc shape, and grains that leak down from the receiving net 12 are received into a sorting chamber 20 for sorting and harvesting of the grains, characterized in that a stirring body 17 is provided near the end of the threshing cylinder 11 inside the threshing chamber 10, entering and intersecting the rotational trajectory of the tip of the threshing teeth 16 from the receiving net 12 side.
[0008] The invention of claim 2 is a threshing device for a combine harvester according to claim 1, wherein the amount of intersection between the rotational trajectory of the tip of the threshing teeth 16 and the stirring body 17 is adjustable.
[0009] The invention of claim 3 is a threshing device for a combine harvester according to claim 1, characterized in that the stirring body 17 is an arc-shaped plate whose edges enter the rotational trajectory of the threshing teeth 16 from the left and right sides of the bottom of the threshing drum 11.
[0010] The invention of claim 4 is a threshing device for a combine harvester according to claim 1, characterized in that the stirring body 17 is provided at the end of the threshing drum 11. [Effects of the Invention]
[0011] In the invention of claim 1, the threshed material, which has been threshed by the threshing teeth 16 of the threshing drum 11 in the threshing chamber 10, is scraped and sent forward as a clump at the rear of the threshing chamber 10. However, the agitator 17, which enters the rotational trajectory of the tip of the threshing teeth 16, breaks up the clump of threshed material, and the loose grains fall onto the receiving net 12 and are sent to the sorting chamber 20 to become harvested grain, thus eliminating harvest loss of grain.
[0012] In the invention of claim 2, by changing the amount of intersection between the threshing teeth 16 and the agitator 17 depending on the amount of grain stalks taken into the threshing chamber 10, it becomes possible to collect the sasari grains while adjusting the amount of intersection so as not to increase the driving load of the threshing drum 11 due to an excessively large amount of intersection.
[0013] In the invention of claim 3, the edges of the arc-shaped plates from the left and right sides of the bottom of the threshing drum 11 intersect with the threshed material being fed by the threshing teeth 16, as they enter the rotational trajectory of the threshing teeth 16. This allows the stirring action of the agitator 17 to work smoothly, preventing the threshed material from stagnating.
[0014] In the invention of claim 4, the agitator 17 acts on the threshed material at the end of the threshing cylinder 11 where the amount of grain contained in the threshed material decreases, thereby effectively recovering the loose grains. [Brief explanation of the drawing]
[0015] [Figure 1] This is a front view of a combine harvester according to an embodiment of the present invention. [Figure 2] This is a right side view of a combine harvester. [Figure 3] This is a plan view of a combine harvester. [Figure 4] This is a side cross-section of a threshing machine. [Figure 5] This is a perspective view of the gun barrel. [Figure 6] This is a rear view of the plate-shaped agitator inside the handling chamber. [Figure 7] This is an exploded view of the agitator. [Figure 8] This is an exploded view of the stirring device in another embodiment. [Modes for carrying out the invention]
[0016] Hereinafter, embodiments of the present invention will be described with reference to the examples shown in the drawings. In the description of the embodiments, the forward direction of the machine will be referred to as "forward," the backward direction as "rear," and the left and right directions relative to the forward direction will be referred to as "left" and "right," respectively, but this does not limit the configuration of the present invention.
[0017] As shown in FIGS. 1 to 3, a general-purpose combine harvester is provided with a traveling device 2 consisting of a pair of left and right crawlers that travel on the soil surface below the machine body frame 1, a pre-harvest treatment device 3 for cutting the cereal straw in the field is provided in front of the machine body frame 1, a threshing device 4 for threshing and sorting the harvested cereal straw is provided on the left rear side of the pre-harvest treatment device 3, and an operator cab 5 for the operator to board is provided on the right rear side of the pre-harvest treatment device 3.
[0018] An engine room 6 for housing the engine is provided below the operator cab 5, a grain tank 7 for storing the threshed and sorted grain is provided behind the operator cab 5, and a discharge auger 8 for discharging the grain to the outside is provided behind the grain tank 7.
[0019] The operator cab 5 is provided with a threshing clutch lever for turning on and off the drive clutch of the threshing device 4, and the engine is configured not to start unless this threshing clutch lever is turned off. A switch is provided to simultaneously turn on and off the switch of the dust suction fan, the switch of the monitor, and the switch of the full tank sensor of the grain tank 7.
[0020] Also, a power-saving configuration may be adopted such that the dust suction fan can be driven when the threshing clutch lever is engaged, and the dust suction fan is driven when the threshing clutch lever is disengaged.
[0021] Also, it is preferable that when the full tank sensor of the grain tank 7 turns on when the threshing clutch lever is engaged, a buzzer sounds, and the buzzer stops when the threshing clutch lever is disengaged.
[0022] Also, it is preferable that when the full paddy sensor of the grain tank 7 turns on while the threshing clutch lever is engaged, a lamp indicating a full paddy on the monitor lights up.
[0023] The pre-harvesting processing device 3 consists of a conveying device 3A that transports the grain stalks in the field to the rear while standing them upright, a cutting blade device 3B that cuts the base of the grain stalks transported to the lower rear of the conveying device 3A, an auger device 3C that gathers the grain stalks transported to the rear of the conveying device 3A to the left, and a feeder house 3D that transports the gathered grain stalks to the threshing device 4.
[0024] As shown in Figure 4, the threshing apparatus 4 consists of a threshing chamber 10 for threshing the grain stalks and a sorting chamber 20 for sorting the threshed grains.
[0025] Threshing drums 11 for threshing stalks transported from the feeder house 3D are mounted on the front and rear walls of the threshing chamber 10, and a receiving net 12 formed in a semi-circular shape along the lower outer circumference of the threshing drum 11 is provided on the underside of the threshing drum 11. The upper part of the threshing drum 11 is covered with an openable and closable threshing drum cover 13, and a dust-feeding plate 15 is provided on the inner circumference of the threshing drum cover 13 to guide the stalks to the rear of the threshing chamber 10.
[0026] As shown in Figure 5, the threshing drum 11 consists of a front impeller 34 and a cylindrical rotor 40. The impeller 34 is formed from a disc-shaped front plate 41, a disc-shaped rear plate 42 with a larger diameter than the front plate 41, and a conical drum plate 43 connecting the outer periphery of the front plate 41 and the rear plate 42. A pair of upper and lower conveying spirals 35 are erected on the outer circumferential surface of the drum plate 43 to convey the grain stalks conveyed to the front of the impeller 34 to the rear.
[0027] The rotor 40 is connected to the rear plate 42 of the impeller 34 and the disc-shaped rear plate 37 of the rotor 40 by support beams 38 made of steel strips that are spaced six times around the circumference. An arc-shaped threshing drum 39, which is a cylinder divided into 60° intervals, is attached to these support beams 38 in a cylindrical shape and is removable by bolts. Six threshing teeth 16 are mounted on the arc-shaped threshing drum 39, protruding radially around its circumference, and it is supported by a rotor shaft 14 that passes through the center of the rear plate 42 of the impeller 34 and the rear plate 37 of the rotor 40, and is driven to rotate.
[0028] At the bottom of the threshing drum 11, a receiving net 12 is provided that surrounds the threshing drum 11 in an arc shape, and a sorting chamber 20 is formed where grains and other materials leak out from the threshed material processed in the threshing chamber 10 and a oscillating sorting device 21 is provided to sort the grains.
[0029] The oscillating sorting device 21 consists of a transfer rack 21A, a chaff sieve 21B, a straw rack 21C, and a sorting screen 21E. The transfer rack 21A is a tray-shaped member that sends the threshed grain backward and uses a grafting plate 24 to gather it towards the center of the handling chamber 10, receiving the threshed grain that falls through the receiving screen 12. The chaff sieve 21B has multiple sieve plates arranged in parallel at intervals and is driven to oscillate back and forth, thereby sieving the grain while transporting it backward, and the threshed grain sent from the transfer rack 21A The threshing grain is sifted from the receiving screen 12, the grain is sifted from the material falling from the chaff sieve 21B, the grain is sorted and dropped by the sorting screen 21E, and fine impurities are retained and transported to the rear. The straw racks 21C are formed to extend in the front-rear direction and have multiple upright plate-shaped rack plates, which are arranged parallel to each other with spacing in the width direction, and the upper edge of each is formed in a sawtooth shape to send the discarded dregs to the discarded dregs outlet 30 at the rear and below and discharge them outside the machine.
[0030] At the end of the receiving screen 12, an agitator 17 made of an arc-shaped plate is provided, as shown in Figure 6, extending from the inner wall of the threshing chamber 10 to the outer circumference of the threshing drum 11. The inner edge of this agitator 17 intersects with the trajectory of the tip of the threshing teeth 16 from the inner circumference of the left and right receiving screens 12 toward the center, loosening the threshed material sent by the threshing teeth 16 and causing the loose grains to fall onto the receiving screen 12, and sending the discharge rod and other components from the chute 18 to the discharge rod outlet 30 and out of the machine. Because the inner edge of the agitator 17 intersects with the trajectory of the tip of the threshing teeth 16 sequentially from the inner circumference of the left and right receiving screens 12 toward the center, the threshed material does not get caught. Furthermore, the maximum amount of intersection between the arc-shaped plate and the trajectory of the tip of the threshing teeth 16 is adjusted to about 2 / 3 to 1 / 3 of the height of the threshing teeth 16.
[0031] As shown in Figure 7, the agitator 17 is divided into two halves, left and right, and is attached to the mounting bases 31, 31 inside the stirring chamber 10 with bolts 32 so that the amount of intersection with the tip trajectory of the stirring teeth 16 can be changed.
[0032] In Figure 8, the stirring body 17 is divided into a left plate 17a and a right plate 17b, and the amount of overhang and crossing toward the stirring drum 11 can be changed for each, and they are attached to the mounting base 31 with bolts 32.
[0033] Furthermore, the stirring body 17 may be provided in multiple locations near the end of the receiving screen 12 rather than at the end itself, and may also be a rod-shaped body that protrudes from inside the stirring chamber 10 along the tip trajectory of the stirring teeth 16.
[0034] At the bottom of the oscillating sorting device 21, from front to back, there is a winnowing machine 25 that blows sorting air into the oscillating sorting device 21, and behind the winnowing machine 25, there are upper air splitters 26A and lower air splitters 26B that divide the direction of the sorting airflow into upper, middle, and lower sections, and the air is then divided and blown to the transfer rack 21A, the chaff sieve 21B, and the straw rack 21C.
[0035] A shielding plate 29 made of rubber is suspended from the oscillating sorting device 21 and placed against the upper surface of the upper air slit 26A to prevent the upper airflow from leaking to the rear. Above this shielding plate 29, a guide plate 23 is installed inside the oscillating sorting device 21, tilting backward in front of the chaff sieve 21B and sorting screen 21E toward the transfer shelf 21A, so that the airflow is directed toward the transfer shelf 21A.
[0036] Furthermore, the lower part is provided with a first spiral 27 that transports grains leaking down from the oscillating sorting device 21 to the grain tank 7, and a second spiral 28 that sends up and transports grains with attached branches and stems, as well as broken stalks, etc., that leak down from the rear of the oscillating sorting device 21 to the transfer rack 21A at the front of the oscillating sorting device 21. [Explanation of Symbols]
[0037] 4. Threshing machine 10 Handling room 11. Handle 12 Receiving net 16 teeth 17 Stirring body 20 Sorting Room
Claims
1. A threshing device for a combine harvester, comprising a threshing cylinder (11) with threshing teeth (16) erected on it, mounted on a shaft inside a threshing chamber (10) of the threshing device (4), the lower outer surface of the threshing cylinder (11) surrounded by a receiving net (12) in an arc shape, and grains that leak down from the receiving net (12) being received into a sorting chamber (20) for sorting and harvesting, characterized in that a stirring body (17) is provided near the end of the threshing cylinder (11) inside the threshing chamber (10) that enters and intersects with the rotational trajectory of the tip of the threshing teeth (16) from the receiving net (12) side.
2. The threshing device for a combine harvester according to claim 1, wherein the amount of intersection between the rotational trajectory of the tip of the threshing teeth (16) and the agitator (17) is adjustable.
3. The threshing device for a combine harvester according to claim 1, characterized in that the stirring body (17) is an arc-shaped plate whose edges enter the rotational trajectory of the threshing teeth (16) from the left and right sides of the bottom of the threshing drum (11).
4. The threshing apparatus for a combine harvester according to claim 1, characterized in that the stirring body (17) is provided at the end of the threshing drum (11).