JP2020174597A - Straw shredding device - Google Patents

Abstract

To provide a straw shredding device which may shred straw finely and has a good rotational balance of a rotating body.SOLUTION: A plurality of rotary blades 14 are spirally arranged on an outer peripheral part of a rotary body so as to form a multiple-thread rotary blade group G. The rotary blades 14 in first rotary blade groups G1 and G2 belonging to the multiple-thread rotary blade group G and the rotary blades 14 in second rotary blade groups G3 and G4 belonging to the multiple-thread rotary blade group G are arranged so as to position at the same position in a rotary shaft direction of the rotary body and on straight lines L1 to L9 passing through the rotary shaft in the side view of the rotary body. The first rotary blade groups G1 and G2 and the second rotary blade groups G3 and G4 constitute rotary blade group units U1 and U2 and a plurality of sets of rotary blade group units U1 and U2 are provided. The plurality of rotary blades 14 are arranged so that the positions of the rotary blades 14 in the direction of the rotary shaft are different for each of the plurality of sets of rotary blade group units U1 and U2.SELECTED DRAWING: Figure 7

Description

The present invention relates to a straw shredding device.

Conventionally, as a straw shredding device, for example, the straw shredding device described in Patent Document 1 is known. The straw shredding device described in Patent Document 1 includes a rotating body (“rotating body [40]” in the document) that is rotationally driven, and a rotating body that projects outward in the radial direction from the outer peripheral portion of the rotating body. A plurality of rotary blades (“rotary blade [41]” in the literature) and a plurality of fixed blades (“fixed blade [42]” in the literature) provided in a state corresponding to the plurality of rotary blades are provided. A straw shredding device (“straw shredding device [38]” in the literature) for shredding straw after grain removal treatment by a plurality of rotary blades and a plurality of fixed blades is disclosed.

JP-A-2017-86021

In the straw shredding device described in Patent Document 1, each rotary blade is arranged at a different position in the direction of the center of rotation axis. As a result, each rotary blade acts on the straw at different positions in the direction of the axis of rotation, which is convenient for finely cutting the straw. However, when the rotary body rotates, the centrifugal force of each rotary blade acts at different positions in the direction of the center of rotation, so if the rotating body rotates at high speed, there is a concern that the center of rotation will shake. ..

In view of the above situation, there is a demand for a straw shredding device capable of finely cutting the straw and having a good rotational balance of the rotating body.

The features of the present invention are a rotary body that is rotationally driven, a plurality of rotary blades that protrude outward in the radial direction of the rotary body from the outer peripheral portion of the rotary body, and a state corresponding to the plurality of rotary blades. A plurality of fixed blades, and the plurality of rotary blades are provided, and the plurality of rotary blades are provided, and the plurality of rotary blades are used to shred the waste straw after the grain removal process. Are spirally arranged on the outer peripheral portion of the rotary body to form a plurality of rotary blade groups, and the rotary blade and the plurality of strips in the first rotary blade group of the plurality of rotary blade groups. The rotary blade in the second rotary blade group of the rotary blade group is positioned on a straight line passing through the rotary axis in a side view of the rotary fuselage at the same position in the direction of the rotary axis of the rotary fuselage. A rotary blade group unit is formed by the first rotary blade group and the second rotary blade group, and a plurality of sets of the rotary blade group units are provided, and the plurality of rotary blades are a plurality of sets. Each of the rotary blade group units is arranged so that the position of the rotary blade in the direction of the center of rotation axis is different.

According to this feature configuration, in each rotary blade group unit, the rotary blade in the first rotary blade group and the rotary blade in the second rotary blade group rotate at the same position in the direction of the center of rotation axis in a side view of the rotary body. It is arranged so as to be located on a straight line passing through the axis. As a result, when the rotary fuselage is rotated, the centrifugal force due to the rotary blade in the first rotary blade group and the centrifugal force due to the rotary blade in the second rotary blade group are displayed in the side view of the rotary fuselage at the same position in the rotation axis direction. On a straight line passing through the center of rotation, it acts toward the outer side in the radial direction opposite to each other. As a result, the centrifugal force of the rotary blade in the first rotary blade group and the centrifugal force of the rotary blade in the second rotary blade group are balanced, and the center of rotation is less likely to shake even if the rotary body rotates at high speed.

Further, according to this feature configuration, the plurality of rotary blades are arranged so that the positions of the rotary blades in the direction of the center of rotation axis are different for each of the plurality of sets of the rotary blade group units. As a result, the rotary blades in each rotary blade group unit act on the straw at different positions in the direction of the center of rotation axis, so that the straw can be cut finely.

That is, according to this feature configuration, it is possible to realize a straw shredding device capable of finely cutting the straw and having a good rotational balance of the rotating body.

Further, in the present invention, the rotary blade is composed of a pair of blades arranged at the same position around the center of rotation at intervals in the direction of the center of rotation, and the pair of blades are used as the fixed blade. It is provided with a first fixed blade that enters between the bodies and a second fixed blade whose rotation locus enters between two adjacent rotary blades in the direction of the axis of rotation in the two sets of adjacent rotary blade group units. It is preferable that it is.

According to this characteristic configuration, the pair of blades and the first fixed blade cut the straw, and the two adjacent rotary blades and the second fixed blade cut the straw. As a result, the straw can be cut into smaller pieces.

Further, in the present invention, the first distance between the pair of blades in the direction of the center of rotation and the second distance between the two adjacent rotary blades in the direction of the center of rotation are the same, and the plurality of blades are the same. It is preferable that the third interval of the fixed blade in the direction of the center of rotation is equal and the same as the first interval and the second interval.

According to this feature configuration, the length of the straw cut by the pair of blades and the first fixed blade and the length of the straw cut by the two adjacent rotary blades and the second fixed blade are set. It becomes almost even. As a result, unevenness in the length of the cut straw can be reduced.

Further, in the present invention, the rotary blade is swingably supported around the swing axis parallel to the rotary axis by the outer peripheral portion of the rotary body, and the free end side portion of the rotary blade is said. It is preferable that the rotating body is configured to be swingable to a position where it retreats to a position opposite to the rotation direction of the rotating body from a straight line passing through the rotating axis and the swinging axis in a side view of the rotating body.

According to this feature configuration, when the rotary blade cuts the straw, the free end side portion of the rotary blade is more than a straight line passing through the rotary axis and the swing axis in the side view of the rotary body. By retreating to the side opposite to the direction of rotation, the rotary blade cuts the straw in a pulled-out state. As a result, the straw can be cut smoothly.

It is a left side view which shows a combine. It is a top view which shows a combine. It is a left side view which shows the inside of the straw shredding device. It is a rear view which shows the inside of the straw shredding device. It is a perspective view which shows the arrangement of a rotary blade. It is a left side view which shows the arrangement of a rotary blade. It is a developed view which shows the arrangement of a rotary blade and a fixed blade. It is a left side view which shows the mounting structure of a rotary blade. FIG. 8 is a cross-sectional view taken along the line IX-IX in FIG. It is a left side view which shows the state which the rotary blade cuts with respect to the straw. It is a bottom view which shows the mounting structure of a fixed blade.

A mode for carrying out the present invention will be described with reference to the drawings. In the following description, the direction of arrow F (see FIGS. 1 and 2) is "front side of the aircraft", the direction of arrow B (see FIGS. 1 and 2) is "rear side of the aircraft", and arrow L (see FIG. 2). ) Is the "left side of the aircraft", and the direction of the arrow R (see FIG. 2) is the "right side of the aircraft".

[Overall composition of combine harvester]
1 and 2 show a head-feeding combine (corresponding to the “combine” according to the present invention). The combine is provided with an airframe frame 1 and a traveling device 2. The traveling device 2 is provided with a pair of left and right front wheels 2F and a pair of left and right rear wheels 2B. In front of the machine body, a cutting section 3 for cutting the planted culm is provided. The cutting unit 3 is provided with a scraping reel 4 for scraping the planted culm, a cutting blade 5 for cutting the planted culm, and a scraping auger 6 for scraping the harvested culm.

A driving cabin 7 is provided at the front of the aircraft. A threshing device 8 for threshing all the culms of the harvested culms is provided. A feeder 9 for transporting the harvested culm toward the threshing device 8 is provided across the cutting section 3 and the threshing device 8. Above the threshing device 8, a grain tank 10 for storing the grains obtained by the threshing process of the threshing device 8 is provided. A grain discharge device 11 for discharging grains in the grain tank 10 is provided. At the rear of the threshing device 8, a straw shredding device 12 for shredding the straw after the threshing process is continuously provided.

[Straw shredding device]
As shown in FIGS. 3 and 4, the straw shredding device 12 includes a rotating body 13 that is rotationally driven around a rotation axis X1 extending in the left-right direction, and a rotating body 13 from the outer peripheral portion of the rotating body 13. A box-shaped shape that covers a plurality of rotary blades 14 projecting outward in the radial direction, a plurality of fixed blades 15 provided in a state corresponding to the plurality of rotary blades 14, a rotary body 13 and a plurality of rotary blades 14. A case 16 and a case 16 are provided. The straw shredding device 12 is configured to shred the straw after the threshing process by the plurality of rotary blades 14 and the plurality of fixed blades 15.

〔Case〕
The case 16 is provided with left and right side plates 18 and a top plate 19 extending over the left and right side plates 18. A receiving port 20 for receiving the straw after the threshing treatment is formed in a portion of the case 16 extending to the front portion and the upper portion. A discharge port 21 for discharging the straw after the shredding process is formed in the lower rear portion of the case 16.

A bottom plate 22 is provided on the bottom of the case 16. The bottom plate 22 is provided over the left and right side plates 18. The bottom plate 22 passes under the rotating fuselage 13 and extends rearward. The rear end of the bottom plate 22 is located on the rear side of the rotation axis X1.

[Rotating fuselage]
The rotating body 13 is a cylindrical member, and is supported by the left and right side plates 18 in a state of being rotatable around the rotation axis X1. An input pulley 23 for inputting a rotational driving force is provided on a portion of the rotary body 13 that protrudes to the left from the left side plate 18. The rotating body 13 is rotationally driven in the direction of arrow A around the rotation axis X1.

[Rotary blade]
As shown in FIGS. 3 to 7, the rotary blade 14 is swingably supported on the outer peripheral portion of the rotary body 13 around a swing axis X2 parallel to the rotary axis X1. In the present embodiment, the rotary blade 14 is configured as a so-called hammer knife type rotary blade. The plurality of rotary blades 14 are spirally arranged on the outer peripheral portion of the rotary body 13, and form a group of rotary blades G having a plurality of strips (four strips in the present embodiment). The rotary blade group G includes a first rotary blade group G1, a second rotary blade group G2, a third rotary blade group G3, and a fourth rotary blade group G4.

The first rotary blade group unit U1 is composed of the first rotary blade group G1 and the third rotary blade group G3. The second rotary blade group unit U2 is composed of the second rotary blade group G2 and the fourth rotary blade group G4. That is, a plurality of sets (two sets in the present embodiment) of the "rotary blade group unit" according to the present invention are provided.

In the present embodiment, the first rotary blade group G1 is provided with nine rotary blades 14. The nine rotary blades 14 in the first rotary blade group G1 are arranged at equal intervals (interval D1) in the direction of the rotary axis X1 and at equal angles (20 degrees) around the rotary axis X1. ..

In the present embodiment, the second rotary blade group G2 is provided with eight rotary blades 14. The eight rotary blades 14 in the second rotary blade group G2 are arranged at equal intervals (interval D1) in the direction of the rotary axis X1 and at equal angles (20 degrees) around the rotary axis X1. ..

In the present embodiment, the third rotary blade group G3 is provided with nine rotary blades 14. The nine rotary blades 14 in the third rotary blade group G3 are arranged at equal intervals (interval D1) in the direction of the rotary axis X1 and at equal angles (20 degrees) around the rotary axis X1. ..

In the present embodiment, the fourth rotary blade group G4 is provided with eight rotary blades 14. The eight rotary blades 14 in the fourth rotary blade group G4 are arranged at equal intervals (interval D1) in the direction of the rotary axis X1 and at equal angles (20 degrees) around the rotary axis X1. ..

In the following, among the nine rotary blades 14 in the first and third rotary blade groups G1 and G3, the first rotary blade 14, the second rotary blade 14, and the third rotary blade 14 are ordered from the left side. Rotary blade 14, 4th rotary blade 14, 5th rotary blade 14, 6th rotary blade 14, 7th rotary blade 14, 8th rotary blade 14, 9th rotary blade It is called 14.

Further, in the eight rotary blades 14 of the second and fourth rotary blade groups G2 and G4, respectively, the first rotary blade 14, the second rotary blade 14, and the third rotary blade 14 are arranged in this order from the left side. , The fourth rotary blade 14, the fifth rotary blade 14, the sixth rotary blade 14, the seventh rotary blade 14, and the eighth rotary blade 14.

The rotary blade 14 in the first rotary blade group G1 and the rotary blade 14 in the third rotary blade group G3 are straight lines L1 to pass through the rotary axis X1 in the side view of the rotary body 13 at the same position in the direction of the rotary axis X1. It is arranged so as to be located on L9. That is, the rotary blade 14 in the first rotary blade group G1 and the rotary blade 14 in the third rotary blade group G3 are positioned 180 degrees out of phase with each other around the rotary axis X1 at the same position in the direction of the rotary axis X1. Have been placed.

More specifically, the first rotary blade 14 in the first rotary blade group G1 and the first rotary blade 14 in the third rotary blade group G3 are the rotary fuselage 13 at the same position in the rotation axis X1 direction. It is arranged so as to be located on a straight line L1 passing through the rotation axis X1 in a side view. The second rotary blade 14 in the first rotary blade group G1 and the second rotary blade 14 in the third rotary blade group G3 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L2 passing through the axis X1. The third rotary blade 14 in the first rotary blade group G1 and the third rotary blade 14 in the third rotary blade group G3 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L3 passing through the axis X1. The fourth rotary blade 14 in the first rotary blade group G1 and the fourth rotary blade 14 in the third rotary blade group G3 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L4 passing through the axis X1. The fifth rotary blade 14 in the first rotary blade group G1 and the fifth rotary blade 14 in the third rotary blade group G3 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L5 passing through the axis X1. The sixth rotary blade 14 in the first rotary blade group G1 and the sixth rotary blade 14 in the third rotary blade group G3 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L6 passing through the axis X1. The seventh rotary blade 14 in the first rotary blade group G1 and the seventh rotary blade 14 in the third rotary blade group G3 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L7 passing through the axis X1. The eighth rotary blade 14 in the first rotary blade group G1 and the eighth rotary blade 14 in the third rotary blade group G3 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L8 passing through the axis X1. The ninth rotary blade 14 in the first rotary blade group G1 and the ninth rotary blade 14 in the third rotary blade group G3 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L9 passing through the axis X1.

The rotary blade 14 in the second rotary blade group G2 and the rotary blade 14 in the fourth rotary blade group G4 are straight lines L1 to pass through the rotary axis X1 in the side view of the rotary body 13 at the same position in the direction of the rotary axis X1. It is arranged so as to be located on L4, L6 to L9. That is, the rotary blade 14 in the second rotary blade group G2 and the rotary blade 14 in the fourth rotary blade group G4 are positioned 180 degrees out of phase with respect to the rotary axis X1 at the same position in the direction of the rotary axis X1. Have been placed.

More specifically, the first rotary blade 14 in the second rotary blade group G2 and the first rotary blade 14 in the fourth rotary blade group G4 are the rotary fuselage 13 at the same position in the rotation axis X1 direction. It is arranged so as to be located on a straight line L6 passing through the rotation axis X1 in a side view. The second rotary blade 14 in the second rotary blade group G2 and the second rotary blade 14 in the fourth rotary blade group G4 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L7 passing through the axis X1. The third rotary blade 14 in the second rotary blade group G2 and the third rotary blade 14 in the fourth rotary blade group G4 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L8 passing through the axis X1. The fourth rotary blade 14 in the second rotary blade group G2 and the fourth rotary blade 14 in the fourth rotary blade group G4 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L9 passing through the axis X1. The fifth rotary blade 14 in the second rotary blade group G2 and the fifth rotary blade 14 in the fourth rotary blade group G4 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L1 passing through the axis X1. The sixth rotary blade 14 in the second rotary blade group G2 and the sixth rotary blade 14 in the fourth rotary blade group G4 rotate in the side view of the rotary body 13 at the same position in the direction of the rotation axis X1. It is arranged so as to be located on a straight line L2 passing through the axis X1. The seventh rotary blade 14 in the second rotary blade group G2 and the seventh rotary blade 14 in the fourth rotary blade group G4 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L3 passing through the axis X1. The eighth rotary blade 14 in the second rotary blade group G2 and the eighth rotary blade 14 in the fourth rotary blade group G4 rotate at the same position in the direction of the rotation axis X1 in a side view of the rotary body 13. It is arranged so as to be located on a straight line L4 passing through the axis X1.

The rotary blade 14 in the first rotary blade group unit U1 and the rotary blade 14 in the second rotary blade group unit U2 are arranged at different positions in the direction of the rotation axis X1. Specifically, the rotary blade 14 in the first rotary blade group unit U1 and the rotary blade 14 in the second rotary blade group unit U2 are displaced from each other by half (D1 / 2) of the distance D1 in the direction of the rotation axis X1. It is placed in the position where it was. That is, the plurality of rotary blades 14 are arranged so that the positions of the rotary blades 14 in the direction of the rotation axis X1 are different for each of the first rotary blade group unit U1 and the second rotary blade group unit U2.

The rotary blade 14 is composed of a pair of blades 17 arranged at the same position around the rotary axis X1 at intervals in the rotary axis X1 direction. Sawtooth-shaped blade portions 17a are formed on both edges of the blade body 17 in the blade width direction. The blade body 17 is a single-edged blade having a blade attached to only one side of the blade portion 17a. Since the blade body 17 has a single blade, a self-polishing action can be expected.

The distance between the pair of blades 17 in the direction of the rotation axis X1 is D2 (corresponding to the "first distance" according to the present invention). In the first rotary blade group unit U1 and the second rotary blade group unit U2, the distance between the two rotary blades 14 whose rotation loci are adjacent to each other in the rotation axis X1 direction in the rotation axis X1 direction is set to D3 (the "first" according to the present invention. Equivalent to "two intervals"). The interval D2 and the interval D3 are the same (D2 = D3).

As shown in FIGS. 8 and 9, a plurality of mounting portions 24 to which the rotary blade 14 is mounted are provided on the outer peripheral portion of the rotary body 13. The mounting portion 24 is provided with a support piece 25 and a pair of stopper pieces 26. The rotary blade 14 is supported by the support piece 25 via a bolt 27 so that the rotary blade 14 can swing around the swing axis X2. The stopper piece 26 functions as a stopper that prevents the rotary blade 14 from swinging around the swing axis X2. The stopper pieces 26 are provided at both ends of the support piece 25 around the swing axis X2.

The pair of blades 17 are attached to one attachment portion 24. The pair of blades 17 are distributed and arranged on both sides of the support piece 25 in the direction of the swing axis X2. The pair of blades 17 are fixed by nuts 28 so as not to come off from the bolts 27. A collar 29 is externally fitted to a portion of the bolt 27 between the blade body 17 on the left side and the support piece 25 and a portion between the blade body 17 on the right side and the support piece 25, respectively. A flat washer 30 is externally fitted to the portion of the bolt 27 between the blade 17 on the left side and the nut 28 and the portion between the blade 17 on the right side and the head of the bolt 27, respectively.

The rotary blade 14 has a position where the base end portion of the rotary blade 14 abuts on one of the stopper pieces 26 and the other stopper piece 26 of the pair of stopper pieces 26 around the swing axis X2. It is configured to be swingable over the position where it comes into contact with. That is, the rotary blade 14 has a rotation direction A of the rotary body 13 rather than straight lines L1 to L9 in which the free end side portion of the rotary blade 14 passes through the rotary axis X1 and the two opposing swing axis X2 in a side view. It is configured to swing to the position where it retires to the opposite side.

As shown in FIG. 10, when the rotary blade 14 cuts the straw, the free end side portion of the rotary blade 14 is viewed from the side of the rotary body 13 as the rotary axis X1 and two rocking axes facing each other. By retreating from the straight lines L1 to L9 passing through X2 to the side opposite to the rotation direction A of the rotating body 13, the rotary blade 14 cuts the straw in a pulled-out state. As a result, the straw can be cut smoothly.

[Fixed blade]
As shown in FIGS. 4, 10 and 11, the fixed blade 15 includes a first fixed blade 15A, a second fixed blade 15B, and a third fixed blade 15C. The first fixed blade 15A is a fixed blade that enters between the pair of blades 17. The second fixed blade 15B is a fixed blade in which the rotation locus of the first rotary blade group unit U1 and the second rotary blade group unit U2 is inserted between two rotary blades 14 adjacent to each other in the direction of the rotation axis X1. The third fixed blade 15C is a fixed blade located laterally outside the rotary blade 14 located on the laterally outermost side in the direction of the rotation axis X1. The first fixed blade 15A and the second fixed blade 15B are alternately arranged in the direction of the rotation axis X1. The plurality of fixed blades 15 are arranged at equal intervals in the direction of the rotation axis X1. The distance between the plurality of fixed blades 15 in the direction of the rotation axis X1 is D4 (corresponding to the "third distance" according to the present invention). The interval D4 is the same as the interval D2 and the interval D3 (D4 = D2 = D3).

The fixed blade 15 is configured so as to project from the bottom plate 22 toward the rotating body 13 and to move in and out along the projecting direction of the fixed blade 15. The base ends of the plurality of fixed blades 15 are connected by a connecting shaft 31 extending in the left-right direction. A plurality of (four in this embodiment) stays 32 are attached to the connecting shaft 31. Below the bottom plate 22, a horizontal frame 33 extending in the left-right direction is provided over the left and right side plates 18. The plurality of fixed blades 15 are supported by the horizontal frame 33 via the connecting shaft 31 and the four stays 32.

The stay 32 is slidably supported by the horizontal frame 33 along the projecting direction of the fixed blade 15. The stay 32 is fixed to the horizontal frame 33 by bolts 34. A long hole 32a through which a bolt 34 is inserted is formed in the stay 32. The elongated hole 32a is an elongated hole that is long along the projecting direction of the fixed blade 15.

At the left end of the horizontal frame 33, a mounting plate 35 to be attached to the left side plate 18 is provided. At the right end of the horizontal frame 33, a mounting plate 35 to be attached to the right side plate 18 is provided. The mounting plate 35 is fixed to the side plate 18 by the first bolt 36, the second bolt 37, and the third bolt 38. The horizontal frame 33 is configured to be swingable with the left and right first bolts 36 as swing fulcrums. The side plate 18 is formed with a long hole 18a through which the second bolt 37 is inserted and a long hole 18b through which the third bolt 38 is inserted. The elongated holes 18a and the elongated holes 18b are elongated holes that are long along the circumferential direction centered on the first bolt 36 (swing fulcrum).

According to such a configuration, the length of the rotary blade 14 protruding from the bottom plate 22 can be changed by moving the horizontal frame 33 along the elongated hole 32a. Further, by swinging the horizontal frame 33 along the elongated holes 18a and the elongated holes 18b with the left and right first bolts 36 as swinging fulcrums, the inclination angle of the fixed blade 15 with respect to the bottom plate 22 can be changed. ..

[Another Embodiment]
(1) In the above embodiment, the first rotary blade group G1 and the third rotary blade group G3 are each provided with nine rotary blades 14. However, the number of rotary blades 14 in the first rotary blade group G1 and the third rotary blade group G3 is the same as the number of rotary blades 14 in the first rotary blade group G1 and the number of rotary blades 14 in the third rotary blade group G3. If they are the same, the present invention is not limited to the above embodiment.

(2) In the above embodiment, the second rotary blade group G2 and the fourth rotary blade group G4 are each provided with eight rotary blades 14. However, the number of rotary blades 14 in the second rotary blade group G2 and the fourth rotary blade group G4 is the same as the number of rotary blades 14 in the second rotary blade group G2 and the number of rotary blades 14 in the fourth rotary blade group G4. If they are the same, the present invention is not limited to the above embodiment.

(3) In the above embodiment, the four rotary blade groups G are provided. However, the rotary blade group G may have even-numbered rows such as six-row and eight-row as long as it has four or more even-numbered rows.

(4) In the above embodiment, two sets of "rotary blade group units" according to the present invention are provided. However, three or more sets of "rotary blade group units" according to the present invention may be provided.

(5) In the above embodiment, as the fixed blade 15, a first fixed blade 15A, a second fixed blade 15B, and a third fixed blade 15C are provided. However, the first fixed blade 15A may not be provided as the fixed blade 15. Alternatively, the second fixed blade 15B may not be provided as the fixed blade 15. Alternatively, the fixed blade 15 may not be provided with the third fixed blade 15C.

(6) In the above embodiment, the interval D2, the interval D3, and the interval D4 are the same. However, the interval D2 and the interval D3 do not have to be the same. Alternatively, the interval D4 does not have to be the same as the interval D2 and the interval D3.

(7) In the above embodiment, the rotary blade 14 is swingably supported around the swing axis X2 on the outer peripheral portion of the rotary body 13, and the free end side portion of the rotary blade 14 is a straight line L1 in a side view. It is configured to be swingable to a position where it retreats to a position opposite to the rotation direction A of the rotary body 13 from ~ L9. However, the rotary blade 14 may be configured to be non-swingable, and the fixed blade 15 may be configured to be swingable around the swing axis parallel to the rotary axis X1. Alternatively, the rotary blade 14 and the fixed blade 15 may be configured to be swingable, respectively. When the fixed blade 15 is configured to swing, it is preferable that a mechanism for swinging and urging the fixed blade 15 on the upright side around the swing axis is provided. By swinging the fixed blade 15 to the lodging side around the swing axis, the straw can be pulled out.

(8) In the above embodiment, the traveling device 2 is a wheel-type traveling device. However, the traveling device 2 may be a crawler type traveling device.

(9) The present invention is not limited to the above-described embodiment and the above-mentioned other embodiment, and various other modifications can be made.

The present invention can be used for a straw shredding device for a combine such as a whole culm harvester.

12 Straw shredding device 13 Rotating fuselage 14 Rotary blade 15 Fixed blade 15A First fixed blade 15B Second fixed blade 17 Pair of blades D2 First interval D3 Second interval D4 Third interval G Rotary blade group G1 First rotation Blade group G2 2nd rotary blade group G3 3rd rotary blade group G4 4th rotary blade group L1 to L9 Straight line U1 1st rotary blade group unit U2 2nd rotary blade group unit X1 Rotation axis X2 Swing axis

Claims (4)

A rotating fuselage that is driven to rotate,
A plurality of rotary blades protruding from the outer peripheral portion of the rotary fuselage toward the radial outer side of the rotary fuselage,
A plurality of fixed blades provided in a state corresponding to the plurality of rotary blades are provided.
A straw shredding device that shreds straw after threshing with the plurality of rotary blades and the plurality of fixed blades.
The plurality of rotary blades are spirally arranged on the outer peripheral portion of the rotary body to form a group of a plurality of rotary blades.
The rotary blade in the first rotary blade group of the plurality of rotary blade groups and the rotary blade in the second rotary blade group of the plurality of rotary blade groups are in the direction of the rotation axis of the rotary body. At the same position of, it is arranged so as to be located on a straight line passing through the center of rotation in the side view of the rotating body.
A rotary blade group unit is formed by the first rotary blade group and the second rotary blade group, and a plurality of sets of the rotary blade group units are provided.
The plurality of rotary blades are a straw shredding device arranged so that the positions of the rotary blades in the direction of the center of rotation axis are different for each of the plurality of sets of the rotary blade group units. The rotary blade is composed of a pair of blades arranged at the same position around the center of rotation and at intervals in the direction of the center of rotation.
As the fixed blade, between the first fixed blade that enters between the pair of blades and the two adjacent rotary blades whose rotation loci are adjacent in the direction of the rotation axis in two adjacent sets of the rotary blade group units. The straw shredding device according to claim 1, further comprising a second fixed blade that enters. The first distance between the pair of blades in the direction of the center of rotation and the second distance between the two adjacent rotary blades in the direction of the center of rotation are the same.
The straw shredding device according to claim 2, wherein the third intervals of the plurality of fixed blades in the direction of the axis of rotation are equal intervals, and are the same as the first interval and the second interval. The rotary blade is swingably supported on the outer peripheral portion of the rotary body around the swing axis parallel to the rotary axis, and the free end side portion of the rotary blade is viewed from the side of the rotary body. The invention according to any one of claims 1 to 3, wherein the rotation axis and the straight line passing through the swing axis can swing to a position where the rotary body retreats to a position opposite to the rotation direction of the rotating body. Straw shredding device.

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