Combine harvester

Abstract

A combine harvester in which a plurality of dust delivery valves (30B) have a first dust delivery member (31) provided in an upper portion of a threshing chamber (16) in a state of extending in a left-right direction of the threshing chamber and being able to change a feed angle by swinging, and a second dust delivery member (32) provided at a position located on an upstream side in a rotation direction of a threshing cylinder with respect to the first dust delivery member (31) in a state of being fixed so as not to change the feed angle. A portion of a top plate (19) opposed to the second dust delivery member (32) is in an arc shape as viewed in a direction along a rotation axis center (P) of the threshing cylinder (20).

Description

Technical Field

[0001] This invention relates to a combine harvester. Background Technology

[0002] A combine harvester includes: a harvesting section for harvesting crops from a field; and a threshing device for threshing the crops from the harvesting section. In this combine harvester, the threshing device includes: a threshing chamber for receiving crops from the harvesting section; a threshing drum rotatably disposed within the threshing chamber to thresh the crops; a top plate covering the top of the threshing chamber; and multiple dust valves arranged along the rotation axis of the threshing drum on the inner portion of the top plate to guide the threshed material toward the rear of the threshing chamber. Each dust valve has: a first dust-feeding member extending laterally within the threshing chamber and capable of changing its feed angle by oscillation; and a second dust-feeding member fixed in a position on the upper part of the threshing chamber, opposite to the first dust-feeding member in the rotation direction of the threshing drum, where the feed angle cannot be changed. This combined harvesting mechanism is such that even if the harvested crops are of different varieties, the threshed material undergoing threshing in the threshing chamber can be moved toward the rear of the threshing chamber by the first dust conveying member according to the feed angle corresponding to the crop variety and the second dust conveying member, and the threshed material can be threshed while moving in the threshing chamber at a speed corresponding to its quality.

[0003] As such a combine harvester, there is the combine harvester shown in Patent Document 1. The combine harvester shown in Patent Document 1 includes: a first dust feeding member (movable dust feeding valve) and a second dust feeding member (fixed dust feeding valve).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-63022 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Even in combine harvesters equipped with a first and a second dust-feeding component, when the threshing material, flowing in the direction of rotation of the threshing cylinder and subjected to rotational force by the cylinder, encounters strong flow resistance upon impacting the top plate, it is difficult for the threshing material to flow towards the rear of the threshing chamber. Furthermore, with strong flow resistance from the top plate, the impact on the first and second dust-feeding components weakens, hindering efficient feeding guidance by these components. The threshing material cannot move within the threshing chamber at a speed appropriate to its quality for proper threshing. In particular, when a large amount of harvested crop is fed into the threshing chamber, the movement speed of the threshing material within the chamber easily becomes inappropriate; the harvesting speed cannot be too fast to avoid supplying too much crop to the threshing chamber.

[0009] The present invention provides a combine harvester that, regardless of the variety of crops being harvested, can simultaneously perform threshing by moving the threshed material at an appropriate speed within the threshing chamber, and carry out harvesting operations.

[0010] Solution for solving the problem

[0011] A combine harvester according to the present invention comprises: a harvesting section for harvesting crops grown in a field; and a threshing device for threshing the crops from the harvesting section, the threshing device comprising: a threshing chamber for receiving crops from the harvesting section; a threshing cylinder rotatably disposed in the threshing chamber for threshing the crops received in the threshing chamber; a top plate covering the top of the threshing chamber; and a plurality of dust valves arranged in a direction along the rotation axis of the threshing cylinder on the inner portion of the top plate to discharge dust from the threshing section. The feed guides the material toward the rear of the threshing chamber. The plurality of dust valves have: a first dust feeding member, which is provided in the upper part of the threshing chamber in a state that extends in the left-right direction of the threshing chamber and can change the feed angle by swinging; and a second dust feeding member, which is fixed in a state that cannot change the feed angle and is provided in the upper part of the threshing chamber at a position on the upstream side of the rotation direction of the threshing cylinder relative to the first dust feeding member. The portion of the top plate opposite the second dust feeding member is arc-shaped when viewed from the direction along the rotation axis.

[0012] According to this configuration, the feed angle of the first dust conveying member is appropriately changed in accordance with the quality of the harvested crop. Thus, even if the threshed material flowing upwards in the threshing chamber due to the rotational force applied by the threshing cylinder collides with the portion of the top plate opposite the second dust conveying member, the arc shape of that portion prevents excessive flow resistance, allowing it to flow smoothly. It then collides violently with the second dust conveying member and is appropriately guided by its feed, and subsequently collides violently with the first dust conveying member and is appropriately guided by its feed angle based on the crop quality. The threshed material moves towards the rear of the threshing chamber at an appropriate speed corresponding to its quality while being threshed. Therefore, regardless of changes in the quality of the harvested crop, harvesting can proceed while performing just the right amount of threshing.

[0013] In this invention, preferably, the first dust conveying member has a notch, which is formed at the lower corner of the upstream side of the threshing cylinder in the first dust conveying member in the direction of rotation, and viewed from the direction along the rotation axis, the downstream end of the threshing cylinder in the second dust conveying member is configured to enter the notch.

[0014] According to this configuration, even if the upstream end of the first dust conveying member and the downstream end of the second dust conveying member in the rotation direction of the threshing cylinder are misaligned in the front-rear direction of the threshing chamber due to the change in the feed angle of the first dust conveying member, since the end of the first dust conveying member is opposite to the end of the second dust conveying member through the notch, the threshed material fed and guided by the second dust conveying member in the downstream direction of the rotation direction of the threshing cylinder is not easily hooked onto the end of the first dust conveying member, and the threshed material can move smoothly toward the rear of the threshing chamber.

[0015] In this invention, preferably, the downstream side of the threshing cylinder in the top plate is formed in a downward and laterally outward orientation towards the threshing chamber, and a downstream dust feeding section extending along the downstream side of the threshing cylinder in the first dust feeding member is provided.

[0016] According to this configuration, when the threshed material flows along the side of the top plate, it is also fed and guided by the downstream dust feeding section of the first dust feeding member, thus enabling high-precision feeding and guidance of the threshed material achieved by the first dust feeding member.

[0017] In this invention, preferably, a gap is provided between the side portion and the upper edge of the downstream dust conveying portion.

[0018] According to this configuration, the downstream dust conveying section and the side of the top plate can move relative to each other so that the first dust conveying member can swing. Therefore, even if the threshing material enters between the downstream dust conveying section and the side, it can easily be removed from between the downstream dust conveying section and the side due to the gap. Thus, it is easy to prevent the threshing material from clogging.

[0019] In this invention, preferably, the first dust conveying member has a support shaft, which is located in the first dust conveying member at a position downstream of the center of the threshing chamber in the left-right direction and upstream of the threshing cylinder in the rotation direction of the threshing cylinder, and the first dust conveying member is supported in a state in which it can swing with the support shaft as the swing fulcrum.

[0020] According to this configuration, compared to the portion of the first dust conveying member located upstream of the center of the threshing chamber in the left-right direction and near the rotation direction of the threshing cylinder, the gap between the downstream dust conveying section and the side portion of the top plate can be narrowed, and the feed angle of the first dust conveying member can be changed within a wider angle range. Compared to the portion of the first dust conveying member located downstream, the height difference in the front-back direction of the threshing chamber that can be formed between the first dust conveying member and the second dust conveying member can be reduced, and the feed angle of the first dust conveying member can be changed within a wider angle range. Therefore, the threshed material can flow smoothly from the second dust conveying member to the first dust conveying member, and the threshed material can be fed and guided by the first dust conveying member within a wider angle range.

[0021] In this invention, preferably, the protruding length of the upstream end of the threshing cylinder in the rotation direction of the first dust conveying component protruding from the top plate into the threshing cylinder is the same as the protruding length of the downstream end of the threshing cylinder in the rotation direction of the second dust conveying component protruding from the top plate into the threshing cylinder.

[0022] According to this configuration, there is no radial height difference between the upstream end of the threshing cylinder in the first dust conveying member and the downstream end of the threshing cylinder in the second dust conveying member. Therefore, the threshed material can flow smoothly from the second dust conveying member to the first dust conveying member, making it less likely for the threshed material to get caught on the first dust conveying member. Attached Figure Description

[0023] Figure 1 This is a left view showing the overall structure of the combine harvester.

[0024] Figure 2 This is a cross-sectional view showing the second threshing processing section.

[0025] Figure 3 yes Figure 2 Section III-III view.

[0026] Figure 4 This is a top view of the dust supply valve. Detailed Implementation

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0028] It should be noted that in the following description, the running gear of the combine harvester will be... Figure 1 The direction of arrow F is set to "front of the aircraft", the direction of arrow B is set to "rear of the aircraft", the direction of arrow U is set to "above the aircraft", the direction of arrow D is set to "below the aircraft", the direction of the front side of the paper is set to "left side of the aircraft", and the direction of the back side of the paper is set to "right side of the aircraft".

[0029] [The overall structure of a combine harvester]

[0030] like Figure 1 As shown, the combine harvester has a traveling body 5 supported by a pair of front wheels 1 and a pair of rear wheels 2, and a driver's section 4 with a passenger space covered by a driver's cab 3. A harvesting and conveying section 6 is located at the front of the traveling body 5, which harvests crops such as rice and wheat from the field and transports the harvested crops to the rear. At the rear of the traveling body 5, below the driver's section 4, are: a threshing device 7, which receives the harvested crops from the harvesting and conveying section 6 and threshes them, performing screening of the threshed material; a grain bin 8, which collects and stores the grains obtained by the threshing device 7; and a prime mover 10, which has an engine 9 as a power source. The grain bin 8 is located above the front of the threshing device 7, and the prime mover 10 is located above the rear of the threshing device 7.

[0031] The harvesting and conveying unit 6 includes: a harvesting unit 6A, located at the front of the harvesting and conveying unit 6, which harvests crops planted in the field and gathers the harvested crops towards the center in the harvesting width direction; and a feeder 6B, which serves as a crop conveying unit, extending rearward from the rear of the harvesting unit 6A and conveying the harvested crops from the harvesting unit 6A toward the threshing device 7 at the rear of the machine body. The harvesting unit 6A includes a rotating drum 11, a cutter 12, and a transverse conveying auger 13, wherein the rotating drum 11 rakes the tips of the crops to be harvested towards the rear, the cutter 12 cuts the stems and roots of the crops to harvest them, and the transverse conveying auger 13 conveys and gathers the harvested crops in the harvesting width direction in front of the feeder 6B.

[0032] [Composition of the threshing device]

[0033] like Figure 1As shown, the threshing device 7 includes: a first threshing processing unit 7A, disposed at the upper part of the threshing device 7, for threshing the harvested crop from the feeder 6B; a second threshing processing unit 7B, disposed at the rear of the first threshing processing unit 7A, for threshing the threshed material processed by the first threshing processing unit 7A; and a screening unit 7C, disposed at the lower part of the threshing device 7, for screening the threshed material from the first threshing processing unit 7A and the second threshing processing unit 7B.

[0034] [The structure of the first grain threshing processing unit]

[0035] The first threshing processing unit 7A is configured such that the width of the first threshing processing unit 7A in the left-right direction of the traveling body is approximately the same as the width of the feeder 6B in the left-right direction of the traveling body, and the width of the first threshing processing unit 7A in the left-right direction of the traveling body is wider than the width of the second threshing processing unit 7B in the left-right direction of the traveling body.

[0036] The first threshing processing unit 7A includes: a threshing unit having a first threshing cylinder 14 capable of rotating about an axis extending in the left-right direction of the traveling machine body; and an intermediate conveyor 15 disposed at the rear side of the first threshing cylinder 14. The intermediate conveyor 15 is configured to rotate about an axis extending in the left-right direction of the traveling machine body. The width of the intermediate conveyor 15 in the left-right direction of the traveling machine body is set to be the same as the width of the first threshing processing unit 7A in the left-right direction of the traveling machine body.

[0037] In the first threshing processing unit 7A, the harvested crop is fed into the threshing processing unit with the first threshing cylinder 14 by the feeder 6B, and the threshing is carried out by the first threshing cylinder 14. The threshed material is then raked by the intermediate conveyor 15 to the second threshing processing unit 7B.

[0038] [The Composition of the Second Grain Dehulling Processing Unit]

[0039] like Figure 2 , Figure 3 As shown, the second threshing processing unit 7B includes: a threshing chamber 16 located at the top of the threshing device 7; a threshing cylinder 20 having a threshing cylinder support shaft 21 located in the front-rear direction of the threshing chamber 16 along the conveying direction of the harvested crop, and rotating around the threshing cylinder support shaft 21 as a fulcrum; and an arc-shaped receiving net 17 located below the threshing cylinder 20.

[0040] The threshing chamber 16 is divided into a front wall 18a and a rear wall 18b supporting the threshing cylinder support shaft 21, a receiving net 17, and a top plate 19 covering the top of the threshing chamber 16. A supply port 16a is formed in the lower front part of the threshing chamber 16 for feeding threshed material from the first threshing processing section 7A into the threshing chamber 16. A stalk discharge section 16b is formed in the lower rear part of the threshing chamber 16 for discharging threshed stalks.

[0041] like Figure 2 As shown, a plurality of dust valves 30 are provided on the inner side of the top plate 19 in the upper part of the threshing chamber 16. The plurality of dust valves 30 are arranged at intervals along the rotation axis P of the threshing cylinder 20. The threshing cylinder 20 is configured such that the threshed material, which is moved to the upper part of the threshing chamber 16 by the rotation of the threshing cylinder 20, collides with the dust valves 30 and is guided by the dust valves 30, thereby guiding the threshed material toward the rear of the threshing chamber 16.

[0042] The threshing drum support shaft 21 is rotatably supported on the front wall 18a and the rear wall 18b in a rearward and upward inclined position. The threshing drum 20, powered by the engine 9, rotates around the axis (rotation axis P) of the threshing drum support shaft 21. Figure 3 The rotational drive, indicated by the central arrow X (counterclockwise when viewed from the rear of the threshing cylinder 20), threshes the grains fed into the threshing chamber 16. The threshing cylinder 20 applies rotational force to the grains, which collide with the dust valve 30 and are guided by the dust valve 30, thus moving the grains towards the rear of the threshing chamber 16 while threshing.

[0043] The receiving net 17 is a concave receiving net formed in the shape of a grid. It receives the threshing material supplied to the threshing chamber 16 and assists the threshing cylinder 20 in threshing the material. On the one hand, it allows the single grains, grains with branches and stalks obtained after threshing, or straw generated during threshing to fall into the screening section 7C below. On the other hand, it prevents the threshed straw (straw) from falling into the screening section 7C.

[0044] like Figure 2 , Figure 4 As shown, the threshing cylinder 20 includes: a rake-gathering section 20A, which is disposed at the front of the threshing cylinder 20; and a threshing processing section 20B, which is connected to the rear of the rake-gathering section 20A.

[0045] [Regarding the composition of the rake section]

[0046] like Figure 2 As shown, the rake-gathering section 20A includes: a base portion 22, the diameter of which decreases as it approaches the front end of the threshing cylinder 20; and spiral blades 23, which are disposed on the outer periphery of the base portion 22 in a state of rising from the outer periphery of the base portion 22 toward the outer side of the base portion 22. Two spiral blades 23 are provided. The two spiral blades 23 are arranged in a double spiral shape, spaced apart circumferentially from the rear end of the base portion 22 to the top end.

[0047] The base section 22 is composed of a metal plate member wound into a frustum shape. The base section 22 is supported on the threshing cylinder support shaft 21 via a circular plate member (not shown) connecting the front end of the base section 22 and the threshing cylinder support shaft 21, and a front support member 24 connecting the rear end of the base section 22 and the threshing cylinder support shaft 21.

[0048] In the raking section 20A, the base section 22 is driven by the threshing cylinder support shaft 21 via the circular plate member and the front support member 24, and the two spiral blades 23 are rotated around the rotation axis P of the threshing cylinder 20. The threshed material fed into the threshing chamber 16 from the feed port 16a by the intermediate conveyor 15 is raked towards the rear of the threshing chamber 16 by the rotating spiral blades 23.

[0049] [Regarding the composition of the threshing processing unit]

[0050] like Figure 2 As shown, the threshing processing unit 20B includes: a front support member 24, supported in the portion of the threshing cylinder support shaft 21 corresponding to the rear portion of the rake section 20A; a rear support member 25, supported in the portion of the threshing cylinder support shaft 21 further rearward than the front support member 24; and three intermediate support members 26, supported in the portion of the threshing cylinder support shaft 21 between the front support member 24 and the rear support member 25. The three intermediate support members 26 are arranged at equal intervals in the front-rear direction of the threshing cylinder support shaft 21. Hereinafter, the foremost intermediate support member 26 among the three intermediate support members 26 will be referred to as the first intermediate support member 26a, the middle intermediate support member 26 among the three intermediate support members 26 will be referred to as the second intermediate support member 26b, and the rearmost intermediate support member 26 among the three intermediate support members 26 will be referred to as the third intermediate support member 26c.

[0051] like Figure 2 As shown, the threshing processing unit 20B includes: a front threshing processing unit 20F, having six rod-shaped front dividing threshing tooth support members 27a located in front of the second intermediate support member 26b; and a rear threshing processing unit 20R, having six rod-shaped rear dividing threshing tooth support members 27b located behind the second intermediate support member 26b. The front dividing threshing tooth support members 27a and 27b are formed by dividing a threshing tooth support member having an integral member extending along the front and rear lengths of both the front and rear dividing threshing tooth support members 27a and 27b into two parts along the front-to-back direction at a position corresponding to the second intermediate support member 26b. The front dividing threshing tooth support members 27a and 27b are offset in the circumferential direction of the threshing cylinder 20.

[0052] like Figure 2As shown, the pre-threshing processing unit 20F includes six front-splitting threshing tooth support members 27a, which are supported on the threshing cylinder support shaft 21 at intervals along the threshing cylinder support shaft 21 and in the circumferential direction of the threshing cylinder 20. The six front-splitting threshing tooth support members 27a are supported on the threshing cylinder support shaft 21 via a front support member 24, a first intermediate support member 26a, and a second intermediate support member 26b. The six front-splitting threshing tooth support members 27a are supported on the threshing cylinder support shaft 21 with equal spacing in the circumferential direction of the threshing cylinder 20. A plurality of threshing teeth 28 are supported on each of the six front-splitting threshing tooth support members 27a at intervals along the direction of the threshing cylinder support shaft 21. The threshing teeth 28 of each front-dividing threshing tooth support member 27a protrude radially outward from the front-dividing threshing tooth support member 27a toward the threshing cylinder 20.

[0053] like Figure 2 As shown, the post-threshing processing unit 20R includes six post-splitting threshing tooth support members 27b, which are supported on the threshing cylinder support shaft 21 at intervals along the threshing cylinder support shaft 21 and circumferentially spaced. The six post-splitting threshing tooth support members 27b are supported on the threshing cylinder support shaft 21 via a second intermediate support member 26b, a third intermediate support member 26c, and a post support member 25. The six post-splitting threshing tooth support members 27b are supported on the threshing cylinder support shaft 21 with equal spacing in the circumferential direction of the threshing cylinder 20. A plurality of threshing teeth 28 are supported on each of the six post-splitting threshing tooth support members 27b at intervals along the threshing cylinder support shaft 21. The threshing teeth 28 of each rear threshing tooth support member 27b protrude radially outward from the rear threshing tooth support member 27b toward the threshing cylinder 20.

[0054] In this embodiment, six front-splitting threshing tooth support members 27a and six rear-splitting threshing tooth support members 27b are provided, but five or fewer, or seven or more, may also be provided. In this embodiment, the front-splitting threshing tooth support members 27a and 27b are constructed of round tubular steel. Besides round tubular steel, the front-splitting threshing tooth support members 27a and 27b can also be made of various other materials such as round steel, square bar steel, and square tubular steel. Furthermore, the front-splitting threshing tooth support members 27a and 27b can also be made of angle steel or channel steel. In this embodiment, each threshing tooth is constructed of round steel. Besides round steel, the threshing teeth 28 can also be made of various other materials such as square bar steel, round tubular steel, and other types of tubular steel.

[0055] In the second threshing processing unit 7B, the threshing material fed into the threshing chamber 16 via the supply port 16a by the intermediate conveyor 15 is raked towards the rear of the threshing chamber 16 by the spiral blades 23 of the raking section 20A, and then threshed by the threshing processing unit 20B and the receiving net 17. The threshed grains fall through the receiving net 17 and are supplied to the screening section 7C, while the threshed stalks and broken stalks are discharged from the stalk discharge section 16b to the outside of the threshing chamber 16.

[0056] The threshing cylinder 20 is configured to have an internal space S1 (see reference) that communicates with the threshing chamber 16 via the front dividing threshing tooth support members 27a and the rear dividing threshing tooth support members 27b. Figure 2 The threshing cylinder 20 is cage-like and is configured to have a plurality of threshing teeth 28 arranged at intervals in the circumferential and processing directions. The plurality of threshing teeth 28 protrude from the outer peripheral surface of the threshing cylinder 20 formed by the front dividing threshing tooth support member 27a and the rear dividing threshing tooth support member 27b toward the radially outer side of the threshing cylinder.

[0057] Therefore, the threshing cylinder 20 rotates around the threshing cylinder support shaft 21 in the processing direction as the rotation center, guiding the threshed material from the harrow section 20A into the space between the threshing section 20B and the receiving net 17. The threshing cylinder 20 then threshes the material into the threshing processing space S2 (reference) located between the outer circumference of the threshing cylinder and the receiving net 17. Figure 2 The threshing material is subjected to threshing treatment by the front splitting threshing tooth support member 27a, the rear splitting threshing tooth support member 27b, and the threshing teeth 28, as well as the combing effect of the threshing teeth 28. The threshing material obtained by this treatment is allowed to enter the internal space S1. While the material in the threshing treatment space S2 and the material in the internal space S1 are stirred, the material is subjected to threshing treatment by the front splitting threshing tooth support member 27a, the rear splitting threshing tooth support member 27b, and the threshing teeth 28, as well as the combing effect of the threshing teeth 28.

[0058] [Composition of the dust supply valve]

[0059] like Figure 2 , Figure 4 As shown, a plurality of dust valves 30 are provided on the inner side of the top plate 19 in the upper part of the threshing chamber 16, and the plurality of dust valves 30 are arranged in the direction along the rotation axis P of the threshing cylinder 20. In this embodiment, ten dust valves 30 are provided, but nine or fewer or eleven or more dust valves 30 may also be provided.

[0060] like Figure 2 , Figure 4As shown, the foremost dust valve 30A and the adjacent dust valve 30A among the ten dust valves 30 are located above the portion K1 of the threshing cylinder 20, where the rake section 20A is located, in the threshing chamber 16. The foremost dust valve 30A and the adjacent dust valve 30A are corresponding rake-feeding dust valves that guide the harvested rice stalks to be rake-fed by the rake section 20A towards the rear of the threshing chamber 16.

[0061] like Figure 2 , Figure 4 As shown, of the ten dust valves 30, eight dust valves 30B, excluding the two dust valves 30A corresponding to the rake, are positioned above the portion K2 of the threshing chamber 16 where the threshing processing section 20B of the threshing cylinder 20 is located. The rear end of portion K2 of the threshing chamber 16 faces the front of the stalk discharge section 16b. The eight dust valves 30B are dust valves corresponding to the threshing process, guiding the threshed material to be threshed by the threshing processing section 20B toward the rear of the threshing chamber 16. In this embodiment, eight dust valves 30B corresponding to the threshing process are provided, but seven or fewer, or nine or more dust valves 30B corresponding to the threshing process may also be provided.

[0062] [The structure of the dust feeding valve corresponding to the rake]

[0063] like Figure 4 As shown, the two corresponding dust feeding valves 30A are fixed on the inner side of the top plate 19 with an unchangeable feed angle Θ2. The two corresponding dust feeding valves 30A are fixed to the top plate 19 by welding.

[0064] [The structure of the dust feeding valve corresponding to the threshing process]

[0065] like Figure 3 , Figure 4 As shown, the eight dust valves 30B corresponding to the threshing process each have: a first dust conveying member 31, which is provided on the inner side of the top plate 19 in a state that extends in the left and right direction of the threshing chamber 16 at the upper part of the threshing chamber 16; and a second dust conveying member 32, which is provided on the upper side of the threshing chamber relative to the first dust conveying member 31 in the rotation direction of the threshing cylinder 20.

[0066] like Figure 3As shown, the central portion 19a of the threshing chamber in the top plate 19 is formed in a flat plate shape when viewed from the direction of the rotation axis P of the threshing cylinder 20. That is, the cross-sectional shape of the central portion 19a is flat when viewed from the direction of the rotation axis P. The upstream side portion 19b of the top plate 19, located upstream of the central portion 19a in the rotation direction of the threshing cylinder, is formed in an arc shape when viewed from the direction of the rotation axis P of the threshing cylinder 20. That is, the cross-sectional shape of the upstream side portion 19b is arc-shaped when viewed from the direction of the rotation axis P. The downstream side portion 19c of the top plate 19, located downstream of the central portion 19a in the rotation direction of the threshing cylinder, is formed in a flat plate shape that is inclined downwards and towards the lateral outer side of the threshing chamber when viewed from the direction of the rotation axis P of the threshing cylinder 20. That is, the cross-sectional shape of the downstream side portion 19c is flat when viewed from the direction of the rotation axis P.

[0067] like Figure 3 As shown, the first dust conveying member 31 is disposed on the inner side of the central portion 19a in the top plate 19. The upper edge 31a of the first dust conveying member 31 opposite to the central portion 19a is formed as a straight line along the central portion 19a. A downstream dust conveying part 31b is provided on the downstream side of the first dust conveying member 31 in the rotation direction of the threshing cylinder, and the downstream dust conveying part 31b extends along the downstream side portion 19c in the top plate 19.

[0068] like Figure 3 , Figure 4 As shown, a support shaft 33 is provided in the first dust conveying member 31 at a position downstream of the center C in the left-right direction of the threshing chamber and upstream of the dust conveying part 31b in the rotational direction of the threshing chamber. A boss 34 supporting the support shaft 33 is provided at the end of the central part 19a of the top plate 19. The first dust conveying member 31 is supported on the top plate 19 in a state where it can swing about the axis Y of the support shaft 33 extending in the vertical direction of the threshing chamber as the pivot point. By swinging the first dust conveying member 31 about the axis Y as the pivot point, the feed angle of the first dust conveying member 31 can be changed.

[0069] like Figure 3 , Figure 4As shown, eight second dust-feeding components 32 are fixed to the inner portion of the upstream side portion 19b of the top plate 19 in a manner that prevents the feed angle Θ3 from being changed. The upstream side portion 19b of the top plate 19 faces the second dust-feeding components 32 and is formed in an arc shape when viewed from the direction along the rotation axis P of the threshing cylinder 20. The second dust-feeding components 32 are fixed to the upstream side portion 19b of the top plate 19. The second dust-feeding components 32 are fixed to the side portion 19b by connecting the downstream portion of the second dust-feeding component 32 in the rotation direction of the threshing cylinder to the side portion 19b using a connecting bolt, and by engaging a protrusion provided in one of the second dust-feeding components 32 and the side portion 19b into a recess provided in the other of the second dust-feeding component 32 and the side portion 19b at a position closer to the upstream portion in the rotation direction of the threshing cylinder than the connecting bolt.

[0070] like Figure 4 As shown, the feed angle of each of the eight first dust conveying components 31 can be varied within an angle range covering the gentlest angle Θ1 and the steepest angle Θ2. The feed angle Θ3 between the feed angle Θ1 and the feed angle Θ2 of the first dust conveying component 31 is the same as the feed angle Θ3 of the eight second dust conveying components 32. The feed angle Θ2 of the first dust conveying component 31 is the same as the feed angle Θ2 of each of the two rake conveying dust valves 30A. Figure 4 The lines A shown are lines that are orthogonal to the rotation axis P, which is the axis of rotation of the threshing cylinder 20, when viewed from above. They are reference lines that represent the feed angles of the first dust feeding member 31, the second dust feeding member 32, and the dust feeding valve 30A.

[0071] like Figure 3 , Figure 4 As shown, the device includes a first feed angle adjustment mechanism 35, which causes the first four dust-feeding components 31 (from the front to the fourth) to swing in tandem to adjust their feed angles. It also includes a second feed angle adjustment mechanism 36, which causes the last four dust-feeding components 31 (excluding the first four) to swing in tandem to adjust their feed angles.

[0072] like Figure 3 , Figure 4As shown, the first feed angle adjustment mechanism 35 includes: a linkage 37, which pivotally supports the ends of the four first dust-feeding components 31 on opposite sides of their respective support shafts 33, and is linked to the four first dust-feeding components 31; and an adjustment rod 38, which is connected to the support shaft 33 of the foremost of the four first dust-feeding components 31. A threaded shaft 39 is engaged on the adjustment rod 38, and an adjustment motor 40 is linked to the threaded shaft 39. The adjustment motor 40 is an electric motor.

[0073] like Figure 3 , Figure 4 As shown, the second feed angle adjustment mechanism 36 has the same configuration as the first feed angle adjustment mechanism 35. That is, the second feed angle adjustment mechanism 36 includes: a linkage rod 37, which is linked to the four first dust feeding components 31; an adjustment rod 38, which is connected to the support shaft 33 of the foremost first dust feeding component 31 among the four first dust feeding components 31; a threaded shaft 39, which engages with the adjustment rod 38; and an adjustment motor 40, which is linked to the threaded shaft 39.

[0074] In the first feed angle adjustment mechanism 35 and the second feed angle adjustment mechanism 36, when the adjustment motor 40 is driven, the threaded shaft 39 is rotated by the adjustment motor 40, the adjustment rod 38 is oscillated by the threaded shaft 39, the support shaft 33 is rotated by the adjustment rod 38, and the foremost first dust conveying member 31 oscillates with the support shaft 33 as the fulcrum. The movement of the foremost first dust conveying member 31 is transmitted to the other three first dust conveying members 31 by the connecting rod 37. The other three first dust conveying members 31 oscillate with the support shaft 33 as the fulcrum, in the same oscillation direction as the foremost first dust conveying member 31, and at the same oscillation angle as the foremost first dust conveying member 31.

[0075] like Figure 4 As shown, the control device 41 is connected to the adjusting motor 40 of the first feed angle adjusting mechanism 35 and the adjusting motor 40 of the second feed angle adjusting mechanism 36, and the first adjusting switch 42 and the second adjusting switch 43 are connected to the control device 41.

[0076] When the first adjustment switch 42 is operated, the control device 41 operates the adjustment motor 40 of the first feed angle adjustment mechanism 35 based on the information from the first adjustment switch 42 and the preset feed angle to make the first four first dust conveying components 31 swing, thereby adjusting the feed angle of each of the first four first dust conveying components 31.

[0077] When the second adjustment switch 43 is operated, the control device 41 operates the adjustment motor 40 of the second feed angle adjustment mechanism 36 based on the information from the second adjustment switch 43 and the preset feed angle, so as to make the four first dust conveying components 31 swing, thereby adjusting the feed angle of each of the four first dust conveying components 31.

[0078] like Figure 4 As shown, the feed angle of the first four first dust feeding components 31 and the last four first dust feeding components 31 is adjusted within the angle range with the gentlest feed angle Θ1 and the steepest feed angle Θ2 by adjusting the power of the motor 40.

[0079] By appropriately operating the first adjusting switch 42 and the second adjusting switch 43, the feed angles of the eight first dust-feeding components 31 can be adjusted to the same feed angle. Furthermore, for example, the feed angles of the first four first dust-feeding components 31 can be adjusted to different feed angles than the feed angles of the last four first dust-feeding components 31.

[0080] When the quality of the harvested crop changes, by changing the feed angle of the first dust conveying member 31 to an appropriate feed angle corresponding to the quality of the harvested crop, the threshing material flowing upward in the threshing chamber 16 under the rotational force applied by the threshing cylinder 20 will not experience too much flow resistance even if it collides with the side portion 19b on the upstream side of the top plate 19, due to the arc shape of the side portion 19b, thus flowing smoothly. It will then collide violently with the second dust conveying member 32 and be fed by the second dust conveying member 32. In turn, the threshing material will collide violently with the first dust conveying member 31 and be fed by the first dust conveying member 31 based on the feed angle adapted to the quality of the crop, moving towards the rear of the threshing chamber 16. The threshing material is threshed while moving backward in the threshing chamber 16 at a moving speed adapted to its quality.

[0081] like Figure 3 As shown, a gap Z is provided between the upper edge 31c of the downstream dust conveying section 31b of the first dust conveying member 31 and the side portion 19c of the top plate 19. Even if the threshed material enters between the downstream dust conveying section 31b and the side portion 19c, it can easily escape from between the downstream dust conveying section 31b and the side portion 19c due to the presence of the gap Z.

[0082] like Figure 3As shown, a notch 44 is formed at the lower corner of the upstream side of the threshing cylinder in the rotation direction of the first dust conveying member 31. Viewed from the direction along the rotation axis P of the threshing cylinder 20, the downstream end 32a of the threshing cylinder in the rotation direction of the second dust conveying member 32 is configured to enter the notch 44. Even if the upstream end 31d of the threshing cylinder in the rotation direction of the first dust conveying member 31 and the downstream end 32a of the threshing cylinder in the rotation direction of the second dust conveying member 32 are misaligned in the front-back direction of the threshing chamber due to the change of the feed angle of the first dust conveying member 31, the threshed material from the second dust conveying member 32 will not easily hook onto the end 31d of the first dust conveying member 31 and will move smoothly towards the first dust conveying member 31.

[0083] like Figure 3 As shown, the protruding length L1 of the upstream end 31d of the first dust conveying member 31 in the rotational direction of the threshing cylinder protruding from the top plate 19 into the threshing cylinder 20 is the same as the protruding length L2 of the downstream end 32a of the second dust conveying member 32 in the rotational direction of the threshing cylinder protruding from the top plate 19 into the threshing cylinder 20. No radial height difference is formed between the second dust conveying member 32 and the first dust conveying member 31.

[0084] [Other Implementation Methods]

[0085] (1) In the above embodiment, an example of using a cage-shaped threshing cylinder 20 is shown, but it is not limited thereto. For example, a drum-shaped threshing cylinder, a threshing cylinder with rasp-shaped threshing teeth, or a threshing cylinder composed of a drum and a cage-shaped part may also be used.

[0086] (2) In the above embodiment, an example is shown where the threshing drum support shaft 21 is erected in a rearward and upward tilted posture, but it can also be supported in a horizontal posture.

[0087] (3) In the above embodiment, an example is shown where the threshing tooth support member is divided into a front-divided threshing tooth support member 27a and a rear-divided threshing tooth support member 27b. However, the threshing tooth support member may also be an integral member without division.

[0088] (4) In the above embodiment, an example is shown where the first dust conveying member 31 has a downstream dust conveying section 31b, but it may also not have a downstream dust conveying section 31b.

[0089] (5) In the above embodiment, an example is shown in which the protruding length L1 of the first dust conveying member 31 is the same as the protruding length L2 of the second dust conveying member 32, but the protruding length L1 of the first dust conveying member 31 and the protruding length L2 of the second dust conveying member 32 may also be different.

[0090] (6) In the above embodiment, an example is shown where eight first dust-feeding members 31 and eight second dust-feeding members 32 are provided, but this is not a limitation. For example, seven or fewer first dust-feeding members 31 and nine or more second dust-feeding members 32 may also be provided. Furthermore, in the above embodiment, an example is shown where the first four first dust-feeding members 31 and the last four first dust-feeding members 31 can be oscillated and adjusted separately, but all the first dust-feeding members 31 may also be oscillated and adjusted in conjunction. In addition, the oscillation adjustment of the first dust-feeding members 31 may be performed manually without the use of an actuator.

[0091] Industrial availability

[0092] The present invention is applicable to a combine harvester, wherein the combine harvester comprises, in a threshing device for threshing crops from the harvesting section: a threshing chamber; a threshing cylinder rotatably disposed in the threshing chamber; a top plate covering the top of the threshing chamber; and a plurality of dust-feeding valves supported on the inner side of the top plate in a manner arranged along the rotation axis of the threshing cylinder, for feeding and guiding the threshed material toward the rear of the threshing chamber.

[0093] Explanation of reference numerals in the attached figures

[0094] 6A: Harvesting section; 7: Threshing device; 16: Threshing chamber; 19d: Part (side); 19c: Side; 20: Threshing cylinder; 30B: Dust valve; 31: First dust conveying component; 31b: Downstream dust conveying section; 31c: Upper edge; 31d: End; 32: Second dust conveying component; 32a: End; 33: Support shaft; 44: Notch; C: Center; K: Gap; L1: Protrusion length; L2: Protrusion length; P: Rotation axis; Z: Gap.

Claims

1. A combine harvester characterised in that, Possessing: a harvesting section that harvests a planted crop in a field; and a threshing device that performs a threshing process on the crop from the harvesting section, the threshing device possesses: a threshing chamber into which the crop from the harvesting section is thrown; a threshing cylinder that is disposed in a rotatable state in the threshing chamber and performs a threshing process on the crop thrown into the threshing chamber; a top plate that covers the upper portion of the threshing chamber; and a plurality of dust delivery valves that are disposed in a state of being arranged in the direction along the rotational axis of the threshing cylinder on the inner side portion of the top plate and guide the threshing process product toward the rear of the threshing chamber, the plurality of dust delivery valves have: a first dust delivery member that is disposed in a state of extending in the left-right direction of the threshing chamber and being able to change the feed angle by swinging in the upper portion of the threshing chamber; and a second dust delivery member that is disposed in a state of being fixed so as not to be able to change the feed angle in the portion of the upper portion of the threshing chamber that is located on the upstream side in the rotational direction of the threshing cylinder with respect to the first dust delivery member, the portion of the top plate that opposes the second dust delivery member is in a circular arc shape when viewed in the direction along the rotational axis, the first dust delivery member has a notch portion that is formed in the lower corner portion on the upstream side in the rotational direction of the threshing cylinder in the first dust delivery member, the notch portion is formed along the shape of the end portion on the downstream side in the rotational direction of the threshing cylinder of the second dust delivery member, the end portion on the downstream side in the rotational direction of the threshing cylinder in the second dust delivery member is configured to enter the notch portion when viewed in the direction along the rotational axis.

2. The combine harvester according to claim 1, characterized in that the side portion on the downstream side in the rotational direction of the threshing cylinder in the top plate is formed in an inclined state that faces downward and toward the lateral outer side of the threshing chamber, a downstream side dust delivery portion that extends along the side portion is provided in the portion on the downstream side in the rotational direction of the threshing cylinder in the first dust delivery member.

3. The combine harvester according to claim 2, characterized in that a gap is provided between the side portion and the upper edge portion of the downstream side dust delivery portion.

4. The combine harvester according to claim 2 or 3, characterized in that the first dust delivery member has a support shaft and is supported in a state of being able to swing with the support shaft as a swing support point, and the support shaft is provided in the portion of the first dust delivery member that is located on the downstream side in the rotational direction of the threshing cylinder than the center in the left-right direction of the threshing chamber and on the upstream side in the rotational direction of the threshing cylinder than the downstream side dust delivery portion.

5. The combine harvester according to any one of claims 1 to 3, characterized in that the protruding length of the end portion on the upstream side in the rotational direction of the threshing cylinder in the first dust delivery member from the top plate toward the threshing cylinder is the same as the protruding length of the end portion on the downstream side in the rotational direction of the threshing cylinder in the second dust delivery member from the top plate toward the threshing cylinder.

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