Thresher of general-purpose combine

Abstract

To perform replacement and repair of worn threshing teeth of a threshing cylinder easily in a short time in a thresher mounted on a general-purpose combine.SOLUTION: In a thresher of a general-purpose combine for taking grain culms reaped by a reaping pretreatment device 3 provided in front of a machine body frame 1 into the thresher 4, and threshing / sorting and harvesting grains, a threshing cylinder 11 is composed of a rotor 32 in which an impeller 31 for taking grain culms into a threshing chamber 10 and a large number of threshing teeth 14 are erected. The rotor 32 in which the threshing teeth 14 are erected on annular rings 16 provided at predetermined intervals in an axial direction is made attachable and detachably by a double nut 17.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. 2023-66592, 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. Between the handling cylinder and a handling screen provided in the lower half of the handling cylinder, the cereal straw is fed backward while the cereal grains are handled, and the threshed material containing the cereal grains leaks from the handling screen onto a swinging sorting device below, where the cereal grains are sorted. The sorted cereal grains are stored in a 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 handling cylinder pivotally supported inside the threshing device of the conventional general-purpose combine, handling teeth are provided on the corner stays of a hexagonal cylindrical body, and each corner stay is connected to form a hexagonal cylindrical body with a stay bar. By removing and disassembling the stay bar, the worn handling teeth can be replaced with new ones.

[0006] However, removing and disassembling the stay bar to replace several worn handling teeth is time-consuming, and if it is during the harvesting operation, the harvesting will be interrupted for a long time.

[0007] An object of the present invention is to enable easy replacement and repair of worn handling teeth of a handling cylinder mounted on a general-purpose combine in a short time.

Means for Solving the Problems

[0008] The problems of the present invention are solved by the following technical means.

[0009] The invention according to claim 1 is a general-purpose combine that takes in the cereal straw cut by a pre-harvest treatment device 3 provided in front of the machine body frame 1 into a threshing device 4, threshes and separates the cereal grains for harvesting. An impeller 31 that takes in the cereal straw into a handling chamber 10 and a rotor 32 with many handling teeth 14 standing upright constitute a handling cylinder 11. The rotor 32 has the handling teeth 14 standing upright on an annular ring 16 provided at a predetermined interval in the axial direction and is detachable with a double nut 17. It is a threshing device for a general-purpose combine.

[0010] The invention according to claim 2 is a threshing device for a general-purpose combine according to claim 1, characterized in that a rear handling tooth 14c provided at the end of the rotor 32 has the same size as a front handling tooth 14a provided immediately after the impeller 31, and the front handling tooth 14a can be exchanged and attached with the rear handling tooth 14c.

[0011] 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 the arrangement of the handling teeth 14 provided following the impeller 31 is arranged along a virtual spiral α extending the conveying spiral 43 of the impeller 31.

Effects of the Invention

[0012] In the invention according to claim 1, since the handling teeth 14 provided on the rotor 32 of the handling cylinder 11 are attached to the annular ring 16 of the rotor 32 with a double nut 17, it is easy to take out the handling cylinder 11 from the handling chamber 10, insert a hand between the annular rings 16, and attach and detach the handling teeth 14. By replacing only the worn handling teeth 14 with new ones, the handling cylinder 11 can be repaired in a short time, so that the handling cylinder 11 can be repaired during the harvesting operation.

[0013] In the invention of claim 2, in addition to the effect of claim 1, the straws taken into the threshing device 4 are sent into the handling chamber 10 by the impeller 31 of the handling cylinder 11, and a large amount of straws are handled while being sent backward by the front handling teeth 14a of the handling cylinder 11. Therefore, the front handling teeth 14a immediately behind the impeller 31 are prone to wear and become short. However, they can be replaced with the rear handling teeth 14c that hardly wear, so that the threshing performance can be maintained and the harvesting operation can be continued for a long time.

[0014] In the invention of claim 3, in addition to the effect of claim 1 or claim 2, the straws sent by the conveying spiral 43 of the impeller 31 are taken over by the handling teeth 14 arranged along the virtual spiral α of the conveying spiral 43, and the conveying resistance is small and they are smoothly sent along the rotor 32 and handled. Therefore, the threshing load is reduced.

Brief Description of the Drawings

[0015]

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Embodiments 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 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 straw in the field in front of the machine body frame 1, a threshing device 4 that threshes and sorts the harvested cereal straw 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 that surrounds the operator's cab 5, and the electric power generated by sunlight is used to charge the battery.

[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 behind the operator's cab 5, and a discharge auger 8 for discharging the grains to the outside is provided behind the grain tank 7 so as to be able to rise and fall.

[0018] The pre-harvesting treatment device 3 is composed of a conveying device 3A that conveys the cereal straw in the field to the rear while standing it up, a cutting blade device 3B that cuts the root of the cereal straw conveyed to the lower rear side of the conveying device 3A, an auger device 3C that gathers the cereal straw 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 straw 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 straw and a sorting chamber 20 for sorting the threshed grains.

[0020] On the front and rear walls of the handling chamber 10, a handling cylinder 11 for threshing the cereal straw conveyed from the feeder house 3D is pivotally supported 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 with an openable and closable handling cylinder cover 13 (FIG. 3), and a dust conveying plate (not shown) for guiding the cereal straw to the rear part of the handling chamber 10 is provided on the inner peripheral part of the handling cylinder cover 13.

[0021] Above the sorting chamber 20, a rocking sorting device 21 for sorting the grains leaking from the handling chamber 10 is provided. Below the rocking sorting device 21, in order from the front side, there are a winnowing basket 25 for blowing sorting air to the rocking sorting device 21, a wind baffle 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 rocking sorting device 21 to the grain tank 7, and a second spiral 28 for re-conveying the grains with branches and stems attached thereto leaking from the rear part of the rocking sorting device 21 to the sorting shelf at the front part of the rocking sorting device 21.

[0022] 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, and a frustum-shaped impeller 31 and a rotor 32 supported on the front part of the rotating shaft 30.

[0023] 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.

[0024] On the front surface of the conveying spiral 43, substantially triangular reinforcing ribs 44 for connecting the side plates 42 and the lower part of the front surface of the conveying spiral 43 at a predetermined angle in the circumferential direction are provided. Thereby, the rigidity of the conveying spiral 43 can be enhanced, and the deformation of the conveying spiral 43 due to the load applied to the conveying spiral 43 from the grain straws can be suppressed.

[0025] 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.

[0026] 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.

[0027] 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. These handling teeth 14 are conventionally the same or slightly protruding 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 the same length and shorter than the central intermediate handling teeth 14b erected in large numbers. By making them lower than the height of the conveying spiral 43 of the impeller 31, the grain straw pushed into the front rotor 32A by the impeller 31 can easily pass between the receiving net 12, reducing 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. However, since the hand 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.

[0028] Also, since the front rotor 32A and the rear rotor 32B have the same shape, they can also be divided by the intermediate plate 35 and attached by swapping front and back.

[0029] The handling teeth 14 provided on the front rotor 32A and the rear rotor 32B are provided on a virtual spiral line α extending the spiral drawn by the conveying spiral 43 of the impeller 31 to helically convey the grain straw backward. The handling teeth 14 deviating from the conveying spiral 43 are also arranged parallel to the virtual spiral line 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.

[0030] The annular ring 16 is made of strip iron and has a cross-sectional shape of (A) square, (B) hexagonal, or (C) circular arc shape as shown in Fig. 8. The handling teeth 14 are screwed on from the outside and attached with double nuts 17. For this reason, it is possible to insert a hand between the annular rings 16 and loosen the double nuts 17 to remove the handling teeth 14.

[0031] 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 (B) hexagonal cross-sectional shape and (C) circular arc cross-sectional shape of Fig. 8, there is a characteristic that straw debris is less likely to get caught. In the (C) circular arc shape of Fig. 8, the part where the nut 17 acts is formed linearly. Thereby, the tightening torque can be ensured.

[0032] Note that the virtual helix α of the handling teeth 14 may be arranged in 6 rows with a circumferential interval of 60°, 7 rows with a circumferential interval of about 51°, or 8 rows with a circumferential interval of about 45°.

[0033] The receiving net 12 is a net that surrounds the lower half of the handling cylinder 11 in an arc shape, and the grain handled by the handling teeth 14 leaks down onto the rocking sorting device 21 from the surroundings. It is also possible to shift this receiving net 12 downward so that the interval from the handling teeth 14 can be widened on the lower side.

[0034] As shown in Fig. 9, the handling cylinder 11 of the threshing device 4 is pivotally supported in the front-rear direction on the rocking sorting device 21 of the machine body frame 1. An arc-shaped guide plate 18 is provided along the up and down direction inside the left side wall 19 of the threshing device 4 at a distance from the receiving net 12 to let the grains and straw debris leaking from the receiving net 12 fall onto the rocking sorting device 21. The interval between the receiving net 12 and the arc-shaped guide plate 18 is made wider at the lower side B than at the upper side A to make it easier for the grains, straw debris, etc. to fall onto the rocking sorting device 21. Note that the interval of one row or two rows may be the same or the upper side A may be widened and the lower side B may be narrowed.

[0035] 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.

Description of Symbols

[0036] 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 43 Conveyor screw α Virtual helix

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) and threshes and sorts the grains before harvesting them. The threshing device of the general-purpose combine harvester is characterized in that the threshing body (11) is composed of an impeller (31) that takes in the stalks into a threshing chamber (10) and a rotor (32) with a plurality of threshing teeth (14) erected thereon, and the threshing teeth (14) of the rotor (32) are erected on annular rings (16) arranged at a predetermined interval in the axial direction and can be attached and detached with a double nut (17).

2. A threshing device for a general-purpose combine as described in claim 1, characterized in that the rear handling teeth (14c) provided at the end of the rotor (32) are the same size as the front handling teeth (14a) provided immediately behind the impeller (31), and the front handling teeth (14a) can be replaced and installed with the rear handling teeth (14c).

3. A threshing device for a general-purpose combine as described in claim 1 or claim 2, characterized in that the arrangement of the threshing teeth (14) subsequent to the impeller (31) is arranged along an imaginary spiral line (α) extending the conveying spiral (43) of the impeller (31).

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