combine harvester threshing device
The combine harvester's threshing device addresses clogging issues by using varying spacing and inclination angles for grain stalk feeding guides, ensuring smooth feeding and efficient threshing of large amounts of cereal straw.
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
The threshing device of a combine harvester experiences clogging and stopping of the drive when large amounts of cereal straw are fed into the handling chamber, leading to inefficient grain separation.
The threshing device is designed with a threshing cylinder having varying spacing and inclination angles for grain stalk feeding guides, with narrower spacing and smaller angles at the front end and wider spacing and larger angles in the middle, ensuring smooth feeding and reliable threshing without clogging.
The design ensures quick and reliable feeding of cereal straw into the threshing chamber, preventing stagnation and maintaining efficient threshing performance even with large amounts of straw, thereby improving grain separation efficiency.
Smart Images
Figure 2026087133000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a combine that harvests grain by cutting cereal straw growing in a field with a cutting device, loading it onto the machine body, and feeding it into a threshing device to handle the cereal straw.
Background Art
[0002] [[ID=1Z]]The threshing device of a combine is described in Japanese Patent No. 5905307.
Prior Art Document
Patent Document
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the threshing device of a combine, when cereal straw is fed into the handling chamber, it is sent backward under the action of the rotation of the handling teeth due to the rotation of the handling cylinder and the feeding action of the dust feeding guide provided on the inner wall of the handling chamber, and is handled between the handling net, and the grain leaks from the handling net into the sorting chamber and is separated and harvested. However, when a large amount of cereal straw is cut by the cutting device of the combine and simultaneously fed into the handling chamber of the threshing device, the feeding of the cereal straw stagnates at the entrance of the handling chamber, and the drive of the threshing device may stop due to clogging of the cereal straw.
[0005] An object of the present invention is to provide a combine that can improve the feeding of cereal straw into the threshing device and maintain good threshing even when a large amount of cereal straw is sent to the threshing device.
Means for Solving the Problems
[0006] The above problems of the present invention are solved by the following technical means.
[0007] The invention of claim 1 is a combine harvester threshing device 4 mounted on a machine frame 1, wherein the threshing device 4 has a threshing cylinder 11 pivotally supported in a threshing chamber 10, a plurality of grain stalk feeding guides 60 provided in the threshing chamber 10, and a receiving net 12 surrounding the lower half of the threshing cylinder 11, characterized in that the spacing La of the front grain stalk feeding guides 60a provided on the front end side of the threshing cylinder 11 is narrower than the spacing Lb of the intermediate grain stalk feeders 60b provided in the middle part of the threshing cylinder 11.
[0008] The invention of claim 2 is a threshing device for a combine harvester according to claim 1, characterized in that the threshing cylinder 11 is composed of an impeller 31 on which a conveying spiral 43 is provided and a rotor 32 on which threshing teeth 14 are erected, and the spacing La of the forward grain stalk feed guides 60a provided in correspondence with the impeller 31 is narrower than the spacing L2 of the intermediate grain stalk feed guides 60b provided in correspondence with the rotor 32.
[0009] The invention of claim 3 is a combine harvester according to claim 2, characterized in that the front grain stalk feeding guide 60a, which is provided corresponding to the front end of the threshing drum 11, is positioned to straddle the front end of the receiving net 12.
[0010] The invention of claim 4 is a combine harvester threshing device 4 mounted on a machine frame 1, wherein the threshing device 4 has a threshing cylinder 11 pivotally supported in a threshing chamber 10, a plurality of grain stalk feeding guides 60 provided in the threshing chamber 10, and a receiving net 12 surrounding the lower half of the threshing cylinder 11, characterized in that the helical inclination angle αa of the front grain stalk feeding guide 60a provided on the front end side of the threshing cylinder 11 is set to be smaller than the helical inclination angle αb of the intermediate grain stalk feeding guide 60b. [Effects of the Invention]
[0011] In the invention of claim 1, the stalks fed into the threshing chamber 10 of the threshing device 4 are quickly guided into the threshing chamber 10 by the front stalk feed guide 60a, which has a narrow spacing La corresponding to the front end of the threshing drum 11. Subsequently, in the middle section of the threshing drum 11, the stalks are slowly fed and reliably handled by the intermediate stalk feed guide 60b, which has a wider spacing Lb. As a result, the stalks are threshed well without clogging.
[0012] In the invention of claim 2, at the entrance to the threshing chamber 10, the conveying spiral 43 of the impeller 34 and the front grain stalk feeding guide 60a feed the grain stalks into the threshing chamber 10 without any problems, and inside the threshing chamber 10, the grain stalks are fed and processed by the rotor 32 and the intermediate grain stalk feeding guide 60b, ensuring that the grain is threshed reliably.
[0013] In the invention of claim 3, the rapid grain feeding action of the front grain stalk feeding guide 60a acts beyond the front end connection of the receiving net 12, preventing stagnation in the feeding of grain stalks.
[0014] In the invention of claim 4, the stalks fed into the threshing chamber 10 of the threshing device 4 are quickly fed into the threshing chamber 10 by the front stalk feeding guide 60a, which has a small inclination feeding angle αa corresponding to the front end of the threshing drum 11. Subsequently, in the middle section of the threshing drum 11, the stalks are slowly fed and reliably handled by the intermediate stalk feeder 60b, which has a large inclination feeding angle αb. As a result, the stalks are threshed well without clogging. [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 side view of the hilt. [Figure 6] This is a perspective view of the gun barrel. [Figure 7] This is a side view of the hilt. [Figure 8] This is a detailed side cross-sectional view of a threshing machine. [Figure 9] (A) A plan view of the first embodiment showing the spacing of the grain stalk feeding guides, and (B) A plan view of the second embodiment. [Modes for carrying out the invention]
[0016] As shown in FIGS. 1 to 3, a general-purpose combine harvester is provided with a traveling device 2 composed of a pair of left and right crawlers that travel on the soil surface below the body frame 1, a pre-harvest treatment device 3 that harvests the cereal straws in the field by cutting them in front of the body frame 1, a threshing device 4 that threshes and sorts the harvested cereal straws on the left rear side of the pre-harvest treatment device 3, and an operator's cab 5 on the right rear side of the pre-harvest treatment device 3. A solar panel 60 is provided on the upper surface of the cab 59 surrounding the operator's cab 5 to charge the battery with the electric power generated by sunlight.
[0017] An engine room 6 housing the engine is provided below the operator's cab 5, a grain tank 7 for storing the threshed and sorted grains is provided on the rear side of the operator's cab 5, and a discharge auger 8 for discharging the grains to the outside is provided on the rear side of the grain tank 7 so as to be able to rise and fall.
[0018] The pre-harvest treatment device 3 is composed of a conveying device 3A that conveys the cereal straws in the field to the rear while standing them up, a cutting blade device 3B that cuts the root of the cereal straws conveyed to the lower rear side of the conveying device 3A, an auger device 3C that collects the cereal straws conveyed to the rear side of the conveying device 3A to the left feeder house 3D, and a feeder house 3D that conveys the collected cereal straws to the threshing device 4.
[0019] As shown in FIG. 4, the threshing device 4 is formed by a handling chamber 10 for threshing the cereal straws and a sorting chamber 20 for sorting the grains threshed at the lower part thereof.
[0020] Handling cylinders 11 for threshing the cereal straws conveyed from the feeder house 3D are pivotally supported by a rotating shaft 30 on the front and rear walls of the handling chamber 10, and a receiving net 12 formed in a semi-arc shape along the lower outer periphery of the handling cylinder 11 is provided below the handling cylinder 11. Further, the upper part of the handling cylinder 11 is covered with an openable and closable handling cylinder cover 13 (FIG. 3), and a cereal straw feed guide 60 (FIG. 8) for guiding the cereal straws to the rear part of the handling chamber 10 is provided on the inner peripheral part of the handling cylinder cover 13.
[0021] At the top of the sorting chamber 20 is an oscillating sorting device 21 that sorts the grains that leak down from the receiving net 12 of the handling chamber 10. At the bottom of the oscillating sorting device 21, in order from the front, are a winnowing machine 25 that blows sorting air into the oscillating sorting device 21, a wind splitter 26 behind the winnowing machine 25 that changes the direction of the sorting air, a first spiral 27 that transports the grains that leak down from the oscillating sorting device 21 to the grain tank 7, and a second spiral 28 that transports grains with stems and other debris attached that leak down from the rear of the oscillating sorting device 21 to the sorting rack at the front of the oscillating sorting device 21.
[0022] As shown in Figures 5 to 7, the thresher drum 11 consists of a rotating shaft 30 that is rotatably supported on the front and rear walls of the thresher chamber 10, and a frustoconical impeller 31 and rotor 32 supported at the front of the rotating shaft 30.
[0023] The impeller 31 is formed from a circular front plate 40, a circular rear plate 41 with a larger diameter than the front plate 40, and side plates 42 connecting the outer periphery of the front plate 40 and the rear plate 41. A pair of upper and lower conveying spirals 43 are erected on the outer periphery of the side plates 42 to convey the grain stalks that have been transported to the front of the impeller 31 to the rear of the impeller 31. This allows the grain stalks that have been transported to the impeller 31 to be efficiently transported from the front to the rear of the impeller 31 and then transferred to the rotor 32.
[0024] The front surface of the conveying spiral 43 is provided with a roughly triangular reinforcing rib 44 that connects the side plate 42 and the lower front surface of the conveying spiral 43 at a predetermined angle in the circumferential direction. This increases the rigidity of the conveying spiral 43 and suppresses deformation of the conveying spiral 43 due to the load applied to it from the grain stalks.
[0025] The rotor 32 is divided into two parts in the front-rear direction, and is formed from a front rotor 32A located behind the impeller 31 and a rear rotor 32B located behind the front rotor 32A.
[0026] The front rotor 32A is located between the rear plate 41 of the impeller 31 and an intermediate plate 35 located in the middle of the rotating shaft 30, while the rear rotor 32B is located between the intermediate plate 35 of the rotating shaft 30 and the rear plate 36 of the rotating shaft 30. The intermediate plate 35 is attached to an intermediate support member 34, which has a hexagonal vertical cross-section in the left-right direction and is located in the middle of the rotating shaft 30 in the front-rear direction.
[0027] The front rotor 32A and the rear rotor 32B are arranged in a cylindrical shape between the rear plate 41 of the impeller 31 and the rear plate 36 of the rotating shaft 30, with annular rings 16 provided at predetermined axial intervals on a cylindrical frame 15, and thrushing teeth 14 erected around the annular rings 16 at predetermined intervals.
[0028] Conventionally, the threshing teeth 14 are the same height as the rear plate 41 of the impeller 31 and the intermediate plates 35 and 36 of the rotor 32. However, the front threshing teeth 14a, which are the first or second row immediately behind the impeller 31, and the rear threshing teeth 14c, which are the first or second row in front of the rear plate 36, are shorter than the numerous centrally positioned intermediate threshing teeth 14b. By making them lower than the height of the conveying spiral 43 of the impeller 31, the grain stalks pushed into the front rotor 32A by the impeller 31 can easily pass between the rotor and the receiving net 12, thereby reducing threshing resistance.
[0029] Furthermore, when the front threshing teeth 14a wear down and become shorter, they can be replaced with the rear threshing teeth 14c, which have less threshing resistance and less wear. This replacement is done by removing the threshing cylinder 11 from the threshing chamber 10, but the threshing teeth 14 can be removed by inserting a hand between each annular ring 16 and loosening the double nuts 17 on the threshing teeth 14, so it can be done quickly during harvesting.
[0030] Furthermore, since the front rotor 32A and the rear rotor 32B have the same shape, they can be separated by the intermediate plate 35 and mounted in a way that allows them to be swapped between the front and rear.
[0031] The threshing teeth 14 on the front rotor 32A and rear rotor 32B are positioned on a virtual helical line α that extends the spiral traced by the conveying spiral 43 of the impeller 31, thereby conveying the grain stalks spirally to the rear. The threshing teeth 14 that detach from the conveying spiral 43 are also arranged parallel to the virtual helical line α.
[0032] Furthermore, if the first threshing teeth 14 following the conveying spiral 43 are positioned approximately 7° behind the rear end of the conveying spiral 43 in the rotational direction, wear will be reduced. Conversely, if they are positioned approximately 7° ahead of the rear end of the conveying spiral 43, threshing will be improved.
[0033] Figure 8 is a detailed side cross-sectional view of the inside of the threshing drum 11, in which the stalk feed guides 60 are arranged on the inner wall 10T of the threshing drum cover 13 that covers the threshing chamber 10 at predetermined axial intervals and tilted in the direction of rotation of the threshing drum 11. The spacing La of the two front stalk feed guides 60a provided on the impeller 31 of the threshing drum 11 is narrow, while the spacing Lb of the intermediate stalk feed guide 60b provided on the rotor 32 is wider than the spacing La of the front stalk feed guides 60a.
[0034] Figure 9 is a plan view of an embodiment showing the spacing and inclination of the grain stalk feeding guides 60. In embodiment (A), the spacing between the front grain stalk feeding guide 60a and the rear grain stalk feeding guide 60c in the handling chamber 10 is narrowed, and the spacing between the intermediate grain stalk feeding guides 60b is widened to make the inclination feeding angle the same.
[0035] The inclination feed angle is the angle at which the threshold cylinder 11 is tilted relative to its axial direction. A smaller inclination feed angle results in a stronger axial feed action. In the embodiment shown in Figure 9(B), the distance between the front grain stalk feeding guide 60a and the rear grain stalk feeding guide 60c is narrowed, reducing the inclination feeding angle αa, while the distance between the intermediate grain stalk feeding guides 60b is widened, increasing the inclination feeding angle αb, thereby slowly feeding the grain stalks and ensuring that threshing is carried out reliably.
[0036] Furthermore, positioning the front grain stalk feeding guide 60a above the front end of the receiving net 12, or positioning the rear grain stalk feeding guide 60c above the rear end of the receiving net 12, will result in smoother grain stalk feeding. [Explanation of Symbols]
[0037] 1. Aircraft frame 4. Threshing machine 10 Handling room 11. Handle 12 Receiving net 14 teeth 31 Impeller 32 rotors 43 Conveyor spiral La spacing Lb spacing 60 Grain Stranding Guide 60a Front grain stalk feeding guide 60b Intermediate grain stalk feeding guide αa Incline feed angle αb Incline feed angle
Claims
1. A threshing device (4) is mounted on a machine frame (1) in a combine harvester, wherein the threshing device (4) has a threshing cylinder (11) pivotally supported in a threshing chamber (10), a plurality of grain stalk feeding guides (60) are provided in the threshing chamber (10), and a receiving net (12) surrounds the lower half of the threshing cylinder (11), characterized in that the spacing (La) of the front grain stalk feeding guides (60a) provided on the front end side of the threshing cylinder (11) is narrower than the spacing (Lb) of the intermediate grain stalk feeders (60b) provided in the middle part of the threshing cylinder (11).
2. The threshing device for a combine harvester according to claim 1, characterized in that the threshing cylinder (11) is composed of an impeller (31) having a conveying spiral (43) and a rotor (32) having threshing teeth (14) erected on it, and the spacing (La) of the forward grain stalk feed guides (60a) provided in correspondence with the impeller (31) is narrower than the spacing (L2) of the intermediate grain stalk feeders (60b) provided in correspondence with the rotor (32).
3. The threshing device for a combine harvester according to claim 2, characterized in that the front grain stalk feeding guide (60a), which is provided corresponding to the front end of the threshing drum (11), is positioned to straddle the front end of the receiving net (12).
4. A combine harvester threshing device (4) is mounted on a machine frame (1), the threshing device (4) having a threshing cylinder (11) pivotally supported in a threshing chamber (10), a plurality of grain stalk feeding guides (60) provided in the threshing chamber (10), and a receiving net (12) surrounding the lower half of the threshing cylinder (11), characterized in that the spiral inclination angle (αa) of the front grain stalk feeding guide (60a) provided on the front end side of the threshing cylinder (11) is set to be smaller than the spiral inclination angle (αb) of the intermediate grain stalk feeding guide (60b).