Thresher of general-purpose combine

Abstract

To maintain threshing efficiency of a threshing cylinder at a satisfactory level and perform repair of worn threshing teeth easily in a thresher mounted on a general-purpose combine.SOLUTION: In a thresher of a general-purpose combine that takes grain culms reaped by a reaping pretreatment device 3 provided in front of a machine body frame 1 into the thresher 4, and threshes and harvests the grains, a threshing cylinder 11 is composed of a rotor 32 in which an impeller 31 for taking in the grain culms and a large number of threshing teeth 14 are erected, and the lower half of the threshing cylinder 11 is surrounded by a receiving net 12 to compose a threshing chamber 10. Front threshing teeth 14a provided immediately behind the impeller 31 are caused to protrude shorter than intermediate threshing teeth 14b in the intermediate part.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a threshing device mounted on a general-purpose combine.

Background Art

[0002] As described in Japanese Patent Application Laid-Open No. 2008-169686, a general-purpose combine cuts cereal straw growing in a field with a pre-harvest treatment device, feeds it into a threshing device, threshes and separates the cereal grains, stores the cereal grains in a grain tank for harvesting, and discharges the threshed straw back to the field.

[0003] In the threshing device, a handling cylinder with handling teeth erected on the outer periphery is pivotally supported in a handling chamber. The cereal straw is handled between the handling cylinder and a handling net provided in the lower half of the handling cylinder while being sent backward, and the threshed material containing cereal grains leaks from the handling net onto the lower swing sorting device below, where the cereal grains are sorted. The cereal grains are stored in the grain tank for harvesting.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the threshing device of the conventional general-purpose combine, the handling cylinder pivotally supported in the handling chamber has an impeller with spiral teeth provided around the conical cylinder facing the front handling cylinder plate, and six cylindrical frames arranged in a cylindrical shape on the front and rear handling cylinder plates, with handling teeth radially arranged at predetermined intervals. The lower half of this handling cylinder is surrounded by a handling net, and the cereal straw fed into the handling chamber is handled between the handling teeth, the cylindrical frames, and the handling net to thresh the cereal grains. For this reason, the handling teeth on the front end side of the handling cylinder are subjected to resistance and worn short by a large amount of cereal straw pushed in from the impeller, or some cereal straw enters and stays inside the six cylindrical frames, resulting in a tendency for the threshing efficiency to decrease.

[0006] The object of the present invention is to maintain good threshing efficiency of the threshing cylinder in a general-purpose combine and to facilitate the repair of worn handling teeth.

Means for Solving the Problems

[0007] The problems of the present invention are solved by the following technical means.

[0008] The invention according to claim 1 is a general-purpose combine that takes in the cereal straw cut by the pre-harvest treatment device 3 provided in front of the machine body frame 1 into the threshing device 4, threshes the cereal grains, and harvests them. An impeller 31 for taking in the cereal straw and a rotor 32 with a plurality of handling teeth 14 erected thereon constitute the handling cylinder 11. The lower half of the handling cylinder 11 is surrounded by a receiving net 12 to form a handling chamber 10. The front handling teeth 14a provided immediately after the impeller 31 project shorter by a predetermined length L1 than the intermediate handling teeth 14b in the middle part. It is a threshing device for a general-purpose combine.

[0009] The invention according to claim 2 is a threshing device for a general-purpose combine according to claim 1, characterized in that the rear handling teeth 14c provided on the terminal side of the handling cylinder 11 project shorter by the same predetermined length L1 as the front handling teeth 14a.

[0010] The invention according to claim 3 is a threshing device for a general-purpose combine according to claim 1 or claim 2, characterized in that an arcuate guide plate 18 is provided along the circumferential surface of the receiving net 12 on the side of the receiving net 12 in the handling chamber 10, extending from above at substantially the same interval or slightly wider toward the rocking sorting device 21.

Effect of the Invention

[0011] In the invention according to claim 1, the cereal straw taken into the threshing device 4 is sent into the handling chamber 10 by the impeller 31 of the handling cylinder 11 and is handled while being sent backward in the receiving net 12 by the handling teeth 14 of the handling cylinder 11. However, immediately after the impeller 31, a large amount of cereal straw is subjected to the handling action by the short front handling teeth 14a, so the handling resistance is less than that in the middle part. The intake of the cereal straw into the handling chamber 10 is smoothly performed without stagnation and is threshed.

[0012] In the invention of claim 2, in addition to the effect of claim 1, even if the front handling tooth 14a wears and the handling action deteriorates, the worn and shortened front handling tooth 14a can be replaced with the short rear handling tooth 14c to maintain the threshing performance and continue the harvesting operation for a long time.

[0013] In the invention of claim 3, in addition to the effect of claim 1 or claim 2, the grains and chaff passing through the receiving net 12 fall evenly and without bias onto the oscillating sorting device 21 through the space between the receiving net 12 and the arc-shaped guide plate 18, enabling good sorting of the grains.

Brief Description of the Drawings

[0014]

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Embodiments for Carrying Out the Invention

[0015] 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-harvesting treatment device 3 that cuts and harvests the cereal straws in the field in front of the machine body frame 1, a threshing device 4 that threshes and sorts the harvested cereal straws on the left rear side of the pre-harvesting treatment device 3, and an operator's cab 5 where the operator rides on the right rear side of the pre-harvesting 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 electricity generated by sunlight.

[0016] An engine room 6 with an engine installed 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.

[0017] The pre-harvesting treatment device 3 includes 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 roots of the cereal straws conveyed to the lower rear side of the conveying device 3A, an auger device 3C that gathers 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 gathered cereal straws to the threshing device 4.

[0018] 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 threshed grains.

[0019] Handling cylinders 11 for threshing the cereal straws conveyed from the feeder house 3D are pivotally supported on the front and rear walls of the handling chamber 10 by a rotating shaft 30, and a receiving net 12 formed in a semi-circular 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 by an openable and closable handling cylinder cover 13 (FIG. 3), and a dust conveying plate (not shown) 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.

[0020] Above the sorting chamber 20, a swing sorting device 21 for sorting the grains leaking from the handling chamber 10 is provided. Below the swing sorting device 21, in order from the front side, there are a winnowing basket 25 for blowing sorting air to the swing sorting device 21, a wind cutter 26 for changing the blowing direction of the sorting air behind the winnowing basket 25, a first spiral 27 for conveying the grains leaking from the swing sorting device 21 to the glen tank 7, and a second spiral 28 for re-conveying the grains with branches and the like adhering thereto, which leak from the rear part of the swing sorting device 21, to the sorting shelf at the front part of the swing sorting device 21.

[0021] As shown in FIGS. 5 to 7, the handling cylinder 11 is composed of a rotating shaft 30 rotatably supported on the front and rear walls of the handling chamber 10, a frustum-shaped impeller 31 supported at the front part of the rotating shaft 30, and a rotor 32.

[0022] The impeller 31 is formed by a circular front plate 40, a circular rear plate 41 having a larger diameter than the front plate 40, and side plates 42 connecting the outer peripheral parts of the front plate 40 and the rear plate 41. On the outer peripheral surface of the side plates 42, a pair of upper and lower conveying spirals 43 for conveying the grain straws conveyed to the front part of the impeller 31 to the rear part of the impeller 31 are erected. Thereby, the grain straws transferred to the impeller 31 can be efficiently conveyed from the front part to the rear part of the impeller 31 and transferred to the rotor 32.

[0023] On the front surface of the conveying spiral 43, substantially triangular reinforcing ribs 44 connecting the side plates 42 and the lower part of the front surface of the conveying spiral 43 are provided at predetermined angles in the circumferential direction. Thereby, the rigidity of the conveying spiral 43 can be enhanced, and deformation of the conveying spiral 43 due to the load applied to the conveying spiral 43 from the grain straws can be suppressed.

[0024] The rotor 32 is formed by a front rotor 32A divided in the front-rear direction and provided on the rear side of the impeller 31, and a rear rotor 32B provided on the rear side of the front rotor 32A.

[0025] The front rotor 32A is provided between the rear plate 41 of the impeller 31 and the intermediate plate 35 provided at the intermediate portion of the rotating shaft 30, and the rear rotor 32B is provided 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 having a hexagonal longitudinal cross-section in the left-right direction provided at the intermediate portion in the front-rear direction of the rotating shaft 30.

[0026] The front rotor 32A and the rear rotor 32B are provided with an annular ring 16 at a predetermined axial interval in a cylindrical frame 15 arranged in a cylindrical shape between the rear plate 41 of the impeller 31 and the rear plate 36 of the rotating shaft 30, and handling teeth 14 are erected at predetermined intervals around the annular ring 16. Conventionally, these handling teeth 14 are at the same height as the rear plate 41 of the impeller 31, the intermediate plate 35 of the rotor 32, and the rear plate 36. However, the front handling teeth 14a, which are one or two rows immediately after the impeller 31, and the rear handling teeth 14c, which are one or two rows in front of the rear plate 36, are shorter than the intermediate handling teeth 14b erected in the center, and are made lower than the height of the conveying spiral 43 of the impeller 31. This makes it easier for the cereal straw pushed into the front rotor 32A by the impeller 31 to pass between the receiving net 12 and reduces the handling resistance. When the front handling teeth 14a wear and become short, they can be replaced with the rear handling teeth 14c, which have less handling resistance and less wear. This replacement work is carried out by taking out the handling cylinder 11 from the handling chamber 10. Since the hands can be inserted between the annular rings 16 to loosen the double nuts 17 of the handling teeth 14 and remove the handling teeth 14, it can be done in a short time during the harvesting operation.

[0027] Also, since the front rotor 32A and the rear rotor 32B have the same shape, they can be divided by the intermediate plate 35 and attached by swapping front and rear.

[0028] The handling teeth 14 provided on the front rotor 32A and the rear rotor 32B are provided on a virtual spiral α that extends the spiral drawn by the conveying spiral 43 of the impeller 31 to helically convey the cereal straw backward. The handling teeth 14 that deviate from the conveying spiral 43 are also arranged parallel to the virtual spiral α. If the first handling tooth 14 following the conveying spiral 43 is provided about 7° behind the rear end of the conveying spiral 43 in the rotational direction, wear will be reduced. Conversely, if it is provided about 7° ahead of the rear end of the conveying spiral 43, threshing will be improved.

[0029] The annular ring 16 is made of strip iron and has a cross-sectional shape of (A) square, (B) hexagonal, or (C) circular arc as shown in Fig. 8. The handling teeth 14 are screwed on from the outside and attached with double nuts 17. Therefore, it is possible to insert a hand between the annular rings 16 and loosen the double nuts 17 to remove the handling teeth 14. In addition, if an auxiliary ring for supporting the handling teeth 14 is provided inside the annular ring 16, the handling teeth 14 can be firmly supported. In the case of the (B) hexagonal cross-sectional shape and the (C) circular arc cross-sectional shape in Fig. 8, there is a characteristic that straw debris is less likely to get caught. In the case of the (C) circular arc in Fig. 8, the portion where the nut 17 acts is formed linearly. Thereby, the tightening torque can be ensured.

[0030] Note that the virtual helix α of the handling teeth 14 may have a circumferential interval of 60° as 6 rows, about 51° as 7 rows, or about 45° as 8 rows.

[0031] The receiving net 12 is a net that surrounds the lower half of the handling cylinder 11 in an arc shape, and the grain particles handled by the handling teeth 14 leak down onto the shaking sorting device 21 from the surroundings. The receiving net 12 may be shifted downward so that the interval from the handling teeth 14 can be widened on the lower side.

[0032] As shown in Fig. 9, the handling cylinder 11 of the threshing device 4 is pivotally supported in the front-rear direction on the shaking sorting device 21 of the machine body frame 1. An arc-shaped guide plate 18 is provided inside the left side wall 19 of the threshing device 4, separated from the receiving net 12 and extending vertically along it, to drop the grain particles and straw debris leaking from the receiving net 12 onto the shaking sorting device 21. The interval between the receiving net 12 and the arc-shaped guide plate 18 is wider at the lower side B than at the upper side A to facilitate the dropping of grain particles, straw debris, etc. onto the shaking sorting device 21. Note that the interval of 1 row or 2 rows may be the same or the upper side A may be widened and the lower side B may be narrowed.

[0033] Note that since the front view of the receiving net 12 is in a semi-circular shape with the upper part widened, the gap between the intermediate handling teeth 14b of the handling cylinder 11 and the receiving net 12 is wider at the upper side and approaches narrowly as it goes downward.

Explanation of symbols

[0034] 4 Threshing device 10 Handling chamber 11 Handling cylinder 12 Receiving net 14 Handling teeth 14a Front handling teeth 14b Intermediate handling teeth 14c Rear handling teeth 18 Arc-shaped guide plate 21 Oscillating sorting device 32 Rotor

Claims

1. This general-purpose combine harvester takes in stalks harvested by a pre-harvesting processing device (3) installed in front of the body frame (1) into a threshing device (4) and threshes and harvests the grains. The threshing device of the general-purpose combine harvester is characterized in that a threshing drum (11) is formed by an impeller (31) that takes in the stalks and a rotor (32) with a plurality of threshing teeth (14) arranged upright, the lower half of the threshing drum (11) is surrounded by a receiving net (12) to form a threshing chamber (10), and the pre-threshing teeth (14a) installed immediately after the impeller (31) protrude a predetermined length (L1) shorter than the intermediate threshing teeth (14b) in the middle.

2. The threshing device of a general-purpose combine harvester according to claim 1, characterized in that the rear threshing teeth (14c) provided at the end side of the threshing drum (11) are protruded a predetermined length (L1) shorter than the front threshing teeth (14a).

3. A threshing device for a general-purpose combine as described in claim 1 or claim 2, characterized in that an arc-shaped guide plate (18) is provided on the side of the receiving net (12) in the handling chamber (10) along the peripheral surface of the receiving net (12) at approximately equal intervals from above or slightly wider, and facing the oscillating sorting device (21).

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