combine

Abstract

To provide a combine with multiple dust-sending valves provided in an inside portion of a top plate while being arranged in the direction along a rotational shaft core of a threshing cylinder in a threshing device and sending the threshed grain to the rear of a threshing chamber for guidance, the combine that can perform the reaping travel while threshing the threshed grain in just proportion even if the kinds of the reaping crops are different in various ways.SOLUTION: Multiple dust-sending valves 30B have: a first dust-sending valve 31 provided in a state of extending in the left / right directions in an upper part of a threshing chamber 16, and in a state of enabling change of a sending angle by swing; and a second dust-sending valve 32 in a state of being fixed so as not to enable the change of the sending angle, in a region positioned in the rotating direction upstream side of the threshing cylinder to the first dust-sending valve 31. A portion opposed to the second dust-sending valve 32 of a top plate 19 is arc-shaped in a directional view along a rotational shaft core P of a threshing cylinder 20.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a combine harvester. [Background technology]

[0002] Some combine harvesters are equipped with a harvesting section that harvests crops planted in a field and a threshing device that threshes the crops from the harvesting section. In some combine harvesters of this type, the threshing device is equipped with a threshing chamber into which the crops from the harvesting section are fed, a threshing drum that is rotatably provided in the threshing chamber and threshes the crops fed into the threshing chamber, a top plate that covers the top of the threshing chamber, and a number of dust-sending valves that are provided on the inside of the top plate and aligned in a direction along the rotation axis of the threshing drum and send and guide the threshed material toward the rear of the threshing chamber, and the number of dust-sending valves include a first dust-sending member that is provided in an upper portion of the threshing chamber so as to extend in the left-right direction of the threshing chamber and to be able to change the feed angle by swinging, and a second dust-sending member that is provided in an upper portion of the threshing chamber upstream of the first dust-sending member in the rotation direction of the threshing drum and fixed so that the feed angle cannot be changed. This type of combine is configured so that, regardless of the variety of crop being harvested, the threshed material to be threshed in the handling chamber is transported toward the rear of the handling chamber by the feed guidance provided by the first dust conveying member using a feed angle corresponding to the crop variety and the feed guidance provided by the second dust conveying member, so that the threshed material can be threshed while moving through the handling chamber at a moving speed corresponding to its quality.

[0003] An example of this type of combine harvester is the combine harvester shown in Patent Document 1. The combine harvester shown in Patent Document 1 is provided with a first dust-transporting member (a movable dust-transporting valve) and a second dust-transporting member (a fixed dust-transporting valve). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-63022 A Summary of the Invention [Problem to be solved by the invention]

[0005] Even in a combine harvester equipped with a first dust-conveying member and a second dust-conveying member, when the threshed material, which is applied with a rotational force by the threshing drum and flows in the upper part of the threshing chamber in the direction of rotation of the threshing drum, hits the top plate and receives strong flow resistance, the threshed material has difficulty flowing toward the rear of the threshing chamber. In addition, when the threshed material receives strong flow resistance from the top plate, the hit against the first dust-conveying member and the second dust-conveying member is weak, and the first dust-conveying member and the second dust-conveying member do not efficiently guide the threshed material through the threshing chamber, so that the threshed material does not move through the threshing chamber at a moving speed suited to its quality, and proper threshing cannot be performed without excess or deficiency. In particular, when a large amount of harvested crops is supplied to the handling chamber, the moving speed of the threshed material through the handling chamber is likely to become inappropriate, so the reaping speed cannot be made too fast so that too much harvested crop is not supplied to the handling chamber.

[0006] The present invention provides a combine harvester that can move threshing material through a handling chamber at an appropriate speed and perform threshing appropriately, regardless of changes in the variety of crop being harvested. [Means for solving the problem]

[0007] The combine according to the present invention comprises: The farm is provided with a reaping unit that reaps crops planted in a field, and a threshing device that threshes the crops from the reaping unit, and the threshing device is provided with a threshing chamber into which the crops from the reaping unit are fed, a threshing drum that is rotatably provided in the threshing chamber and threshes the crops fed into the threshing chamber, a top plate that covers the top of the threshing chamber, and a plurality of dust-transfer valves that are provided on the inner side of the top plate and aligned in a direction along the rotation axis of the threshing drum and that feed and guide the threshed material toward the rear of the threshing chamber. The plurality of dust-transport valves include a first dust-transport member provided in an upper portion of the handling chamber so as to extend in the left-right direction of the handling chamber and so as to be able to change a feed angle by swinging, and a second dust-transport member provided in an upper portion of the handling chamber at a portion upstream of the first dust-transport member in the rotation direction of the handling drum and fixed so that the feed angle cannot be changed, and a portion of the top plate facing the second dust-transport member is arc-shaped when viewed in a direction along the rotation axis. The first dust-transporting member has a notch formed in a lower corner portion on the upstream side of the rotation direction of the throttling drum of the first dust-transporting member, and an end portion on the downstream side of the rotation direction of the throttling drum of the second dust-transporting member is configured to fit into the notch portion when viewed in a direction along the rotation axis. .

[0008] 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. Then, even if the threshed material is rotated by the threshing drum and flows upward in the threshing chamber and hits the part of the top plate facing the second dust-conveying member, it flows smoothly without receiving strong flow resistance due to the arc shape of this part, hits the second dust-conveying member with force and is appropriately guided by the second dust-conveying member, and then hits the first dust-conveying member with force and is appropriately guided by the feed angle of the first dust-conveying member adapted to the quality of the crop, and the threshed material moves toward the rear of the threshing chamber at an appropriate moving speed corresponding to the quality and is threshed, so that the threshed material can be threshed while performing appropriate threshing without excess or deficiency regardless of changes in the quality of the harvested crop.

[0009]

[0010] According to this configuration, even if the end of the first dust transport member on the upstream side in the rotation direction of the threshing drum and the end of the second dust transport member on the downstream side in the rotation direction of the threshing drum are misaligned in the front-to-rear direction of the threshing chamber due to a change in the feed angle of the first dust transport member, the end of the first dust transport member faces the end of the second dust transport member by the cut-out portion, so that the threshing material being transported and guided by the second dust transport member toward the downstream side in the rotation direction of the threshing drum is less likely to get caught on the end of the first dust transport member, and the threshing material can be moved smoothly toward the rear of the threshing chamber.

[0011] In the present invention, It is preferable that the side portion of the top plate downstream in the direction of rotation of the handling drum is formed in a downward and outwardly inclined state toward the side of the handling chamber, and that the portion of the first dust-conveying member downstream in the direction of rotation of the handling drum is provided with a downstream-side dust-conveying portion extending along the side portion.

[0012] According to this configuration, even when the threshed material flows along the side of the top plate, it is sent and guided by the downstream dust sending portion of the first dust sending member, so that the threshed material can be accurately guided and sent by the first dust sending member.

[0013] In the present invention, It is preferable that a gap is provided between the side portion and an upper edge portion of the downstream dust sending portion.

[0014] According to this configuration, relative movement between the downstream side dust transport section and the side of the top plate is possible so that the first dust transport member can swing. Therefore, even if the threshing material gets stuck between the downstream side dust transport section and the side, the gap makes it easy for the threshing material to slip out from between the downstream side dust transport section and the side, making it easy to prevent the threshing material from becoming clogged.

[0015] In the present invention, It is preferable that the first dust-conveying member has a support shaft provided at a position downstream in the direction of rotation of the handling drum from the center of the handling chamber in the left-right direction of the first dust-conveying member and upstream in the direction of rotation of the handling drum from the downstream dust-conveying section, and that the first dust-conveying member is supported in a swingable state with the support shaft as a swing fulcrum.

[0016] According to this configuration, compared to providing a support shaft at a position upstream of the center of the first dust transport member in the left-right direction of the handling chamber in the threshing drum rotation direction, the feed angle of the first dust transport member can be changed over a wide angle range while narrowing the gap between the downstream dust transport section and the side of the top plate section, and compared to providing a support shaft at the downstream dust transport section, the feed angle of the first dust transport member can be changed over a wide angle range while reducing the step in the front-to-back direction of the handling chamber between the first dust transport member and the second dust transport member.Therefore, the threshed material can be transported and guided over a wide angle range by the first dust transport member while allowing the threshed material to flow smoothly from the second dust transport member to the first dust transport member.

[0017] In the present invention, It is preferable that the protruding length of the end of the first dust-transporting member on the upstream side in the direction of rotation of the handling drum protrudes from the top plate toward the handling drum and the protruding length of the end of the second dust-transporting member on the downstream side in the direction of rotation of the handling drum protrudes from the top plate toward the handling drum are the same.

[0018] According to this configuration, there is no step in the radial direction of the threshing drum between the end of the first dust conveying member on the upstream side in the direction of threshing drum rotation and the end of the second dust conveying member on the downstream side in the direction of threshing drum rotation, so that the threshing material flows smoothly from the second dust conveying member to the first dust conveying member, making it less likely that the threshing material will get caught in the first dust conveying member. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a left side view showing the entire combine harvester. [Diagram 2] A cross-sectional view showing the second threshing processing unit. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, with regard to the running body of the combine, the direction of arrow F shown in Figure 1 is referred to as the "front of the body," the direction of arrow B is referred to as the "rear of the body," the direction of arrow U is referred to as the "upper body," the direction of arrow D is referred to as the "lower body," the direction toward the front of the page is referred to as the "left side of the body," and the direction toward the back of the page is referred to as the "right side of the body."

[0021] [Overall configuration of the combine] As shown in FIG. 1, the combine harvester is provided with a traveling machine body 5 having a driving section 4 supported by a pair of left and right front wheels 1 and a pair of left and right rear wheels 2, and a riding space covered by a cabin 3. A reaping and conveying section 6 is provided at the front of the traveling machine body 5, which reaps planted crops such as rice and wheat in the field and conveys the harvested crops rearward. A threshing device 7 that receives the harvested crops from the reaping and conveying section 6, threshes them, and sorts the threshed crops, a grain tank 8 that collects and stores the grains obtained by the threshing device 7, and a motive power section 10 that has an engine 9 as a power source are provided at a portion rearward of the driving section 4 of the traveling machine body 5. The grain tank 8 is provided above the front of the threshing device 7, and the motive power section 10 is provided above the rear of the threshing device 7.

[0022] The reaping and conveying section 6 is provided with a reaping section 6A, which is provided in front of the reaping and conveying section 6 and which reaps crops planted in the field and gathers the harvested crops in the center in the direction of the cutting width, and a feeder 6B, which extends backward from the rear of the reaping section 6A and serves as a crop conveying section and conveys the harvested crops from the reaping section 6A toward the threshing device 7 at the rear of the machine body. The reaping section 6A is provided with a rotary reel 11 which scrapes backward the ear side of the planted crop to be harvested, a cutting blade 12 which cuts the base of the planted crop to harvest the planted crop, a lateral feed auger 13 which conveys the harvested crops in the direction of the cutting width and gathers them in front of the feeder 6B, and the like.

[0023] [Configuration of threshing device] As shown in Figure 1, the threshing device 7 is equipped with a first threshing processing section 7A provided at the top of the threshing device 7 and which threshes the harvested crops from the feeder 6B, a second threshing processing section 7B provided behind the first threshing processing section 7A and which threshes the threshed material processed by the first threshing processing section 7A, and a sorting section 7C provided at the bottom of the threshing device 7 and which sorts the threshed material from the first threshing processing section 7A and the second threshing processing section 7B.

[0024] [Configuration of the first threshing processing section] The first threshing processing unit 7A is configured so that the width of the first threshing processing unit 7A in the left-right direction of the running body is approximately the same as the width of the feeder 6B in the left-right direction of the running body, and so that the width of the first threshing processing unit 7A in the left-right direction of the running body is wider than the width of the second threshing processing unit 7B in the left-right direction of the running body.

[0025] The first threshing processing section 7A is equipped with a threshing processing section having a first threshing drum 14 that can be rotated about an axis extending in the left-right direction of the traveling body, and an intermediate conveying body 15 that is provided behind the first threshing drum 14. The intermediate conveying body 15 is configured to be rotatable about an axis extending in the left-right direction of the traveling body. The width of the intermediate conveying body 15 in the left-right direction of the traveling body is made the same as the width of the first threshing processing section 7A in the left-right direction of the traveling body.

[0026] In the first threshing processing section 7A, the entire harvested crop is fed by the feeder 6B into a threshing processing section having a first threshing drum 14 and threshed by the first threshing drum 14, and the threshed material is then scraped into the second threshing processing section 7B by the intermediate conveying body 15.

[0027] [Configuration of the second threshing processing section] As shown in Figures 2 and 3, the second threshing processing section 7B is equipped with a threshing chamber 16 located at the top of the threshing device 7, a threshing drum 20 having a threshing drum support shaft 21 facing forward and backward and positioned in the threshing chamber 16 along the transport direction of the harvested crop, and rotating around the threshing drum support shaft 21, and an arc-shaped receiving net 17 located below the threshing drum 20.

[0028] The threshing chamber 16 is defined by a front wall 18a and a rear wall 18b that support the threshing drum support shaft 21, a receiving net 17, a top plate 19 that covers the upper part of the threshing chamber 16, etc. At the front lower part of the threshing chamber 16, a supply port 16a is formed through which the threshed material from the first threshing processing section 7A can be fed into the threshing chamber 16. A stalk discharge section 16b is formed at the rear lower part of the handling chamber 16, through which threshed stalks can be discharged.

[0029] 2, in the upper part of the threshing chamber 16, a plurality of dust sending valves 30 are arranged at intervals in the direction along the rotation axis P of the threshing drum 20 and are provided on the inside part of the top plate 19. The threshing drum 20 is configured so that the threshing material transferred to the upper part of the threshing chamber 16 by the rotation of the threshing drum 20 hits the dust sending valves 30 and is guided by the dust sending valves 30, thereby sending and guiding the threshing material toward the rear of the threshing chamber 16.

[0030] The threshing drum support shaft 21 is rotatably supported by the front wall 18a and the rear wall 18b in an inclined position with the rear raised. The threshing drum 20 is driven to rotate around the axis (rotation axis P) of the threshing drum support shaft 21 by power from the engine 9 in the rotation direction indicated by arrow X in Fig. 3 (counterclockwise when looking at the threshing drum 20 from the rear), thereby threshing the material to be threshed that has been put into the threshing chamber 16. The threshing drum 20 imparts a rotational force to the material to be threshed, and the material to be threshed to which the rotational force has been applied hits the dust sending valve 30 and is guided by the dust sending valve 30, thereby transporting the material to be threshed toward the rear of the threshing chamber 16 while performing the threshing process.

[0031] The receiving net 17 is a concave receiving net formed in a lattice shape that receives the threshed material supplied to the handling chamber 16 and assists the threshing process of the threshing drum 20 in the threshing process of the threshed material, allowing single grain grains and grains with stalks obtained during the threshing process, as well as straw dust generated during the threshing process, to leak toward the sorting section 7C below, while preventing the leakage of threshed culms (discarded culms) and the like into the sorting section 7C.

[0032] As shown in Figs. 2 and 4, the threshing drum 20 includes a pick-up section 20A provided at the front of the threshing drum 20, and a threshing processing section 20B connected to the rear of the pick-up section 20A.

[0033] [Configuration of the scraping section] 2, the sweeping section 20A includes a base section 22 having a smaller diameter toward the front end side of the handling drum 20, and a spiral blade 23 provided on the outer periphery of the base section 22 in a state rising from the outer periphery of the base section 22 toward the outside of the base section 22. Two spiral blades 23 are provided. The two spiral blades 23 are double spirals arranged at an interval in the circumferential direction of the base section 22, and are provided from the rear end to the tip end of the base section 22.

[0034] The base part 22 is made of a sheet metal member wound into a truncated cone shape. The base part 22 is supported by the handling cylinder support shaft 21 via a disk member (not shown) that connects the front end part of the base part 22 to the handling cylinder support shaft 21 and a front support member 24 that connects the rear end part of the base part 22 to the handling cylinder support shaft 21.

[0035] In the scraping section 20A, the base section 22 is driven by the threshing drum support shaft 21 via a disk member and a front support member 24, and the two helical blades 23 are rotated around the rotation axis P of the threshing drum 20. The threshed material fed into the threshing chamber 16 from the supply port 16a by the intermediate conveyor 15 is scraped toward the rear of the threshing chamber 16 by the rotating helical blades 23.

[0036] [Configuration of the processing unit] As shown in Figure 2, the handling processing section 20B is provided with a front support member 24 supported on a portion of the handling drum support shaft 21 corresponding to the rear of the sweeping section 20A, a rear support member 25 supported on a portion of the handling drum support shaft 21 rearward of the front support member 24, and three intermediate support members 26 supported on portions of the handling drum support shaft 21 between the front support member 24 and the rear support member 25. The three intermediate support members 26 are lined up at equal intervals in the front-to-rear direction of the handling drum support shaft 21. In the following, the frontmost intermediate support member 26 of the three intermediate support members 26 will be referred to as the first intermediate support member 26a, the middle intermediate support member 26 of the three intermediate support members 26 will be referred to as the second intermediate support member 26b, and the rearmost intermediate support member 26 of the three intermediate support members 26 will be referred to as the third intermediate support member 26c.

[0037] As shown in Fig. 2, the threshing processing section 20B includes a front threshing processing section 20F having six rod-shaped front split threshing tooth support members 27a located forward of the second intermediate support member 26b, and a rear threshing processing section 20R having six rod-shaped rear split threshing tooth support members 27b located rear of the second intermediate support member 26b. The front split threshing tooth support member 27a and the rear split threshing tooth support member 27b are formed by splitting a single threshing tooth support member having a front-rear length spanning the front split threshing tooth support member 27a and the rear split threshing tooth support member 27b into two in the front-rear direction at a position corresponding to the second intermediate support member 26b. The front split threshing tooth support member 27a and the rear split threshing tooth support member 27b are misaligned in the circumferential direction of the threshing drum 20.

[0038] As shown in FIG. 2, the pre-threading processing section 20F includes six front split handling tooth support members 27a that are supported by the handling drum support shaft 21 along the handling drum support shaft 21 and spaced apart in the circumferential direction of the handling drum 20. The six front split handling tooth support members 27a are supported by the handling drum support shaft 21 via the front support member 24, the first intermediate support member 26a, and the second intermediate support member 26b. The six front split handling tooth support members 27a are supported by the handling drum support shaft 21 with the same arrangement pitch in the circumferential direction of the handling drum 20. Each of the six front split handling tooth support members 27a supports a plurality of handling teeth 28 spaced apart in the direction along the handling drum support shaft 21. The handling teeth 28 of each front split handling tooth support member 27a protrude from the front split handling tooth support member 27a toward the radial outside of the handling drum 20.

[0039] As shown in FIG. 2, the rear threshing processing section 20R includes six rear split threshing teeth support members 27b that are supported by the threshing drum support shaft 21 along the threshing drum support shaft 21 and spaced apart in the circumferential direction of the threshing drum 20. The six rear split threshing teeth support members 27b are supported by the threshing drum support shaft 21 via the second intermediate support member 26b, the third intermediate support member 26c, and the rear support member 25. The six rear split threshing teeth support members 27b are supported by the threshing drum support shaft 21 with the same arrangement pitch in the circumferential direction of the threshing drum 20. Each of the six rear split threshing teeth support members 27b supports a plurality of threshing teeth 28 spaced apart in the direction along the threshing drum support shaft 21. The threshing teeth 28 of each rear split threshing teeth support member 27b protrude from the rear split threshing teeth support member 27b toward the radial outside of the threshing drum 20.

[0040] In this embodiment, six front split handling tooth support members 27a and six rear split handling tooth support members 27b are provided, but five or fewer or seven or more may be provided. In this embodiment, the front split handling tooth support members 27a and the rear split handling tooth support members 27b are made of round pipe steel. For the front split handling tooth support member 27a and the rear split handling tooth support member 27b, various materials such as round steel, square bar steel, and square pipe steel can be used in addition to round pipe steel. Furthermore, angle material and channel material can also be used for the front split handling tooth support member 27a and the rear split handling tooth support member 27b. In this embodiment, each handling tooth is made of round steel. For the handling tooth 28, various materials such as round steel, square bar steel, round pipe material, and various pipe materials can be used in addition to round steel.

[0041] In the second threshing section 7B, the threshed material fed into the threshing chamber 16 via the supply port 16a by the intermediate conveyor 15 is scraped toward the rear of the threshing chamber 16 by the spiral blade 23 of the scraping section 20A, and is threshed by the threshing section 20B and the receiving net 17. The grains obtained by the threshing process drop through the receiving net 17 and are supplied to the sorting section 7C, and the threshed stalks and broken straw are discharged to the outside of the threshing chamber 16 from the stalk discharge section 16b.

[0042] The handling drum 20 is configured in a cage shape with an internal space S1 (see Figure 2) formed therein that communicates with the handling chamber 16 via the spaces between the front divided handling tooth support members 27a and the spaces between the rear divided handling tooth support members 27b, and is configured to have a plurality of handling teeth 28 that protrude from the outer peripheral surface of the handling drum 20 formed by the front divided handling tooth support members 27a and the rear divided handling tooth support members 27b toward the outside in the radial direction of the handling drum, and are aligned at intervals in the circumferential direction and processing direction of the handling drum 20.

[0043] Therefore, the threshing drum 20 rotates about the threshing drum support shaft 21 in the processing direction as the center of rotation, thereby introducing the threshed material from the sweeping section 20A between the threshing section 20B and the receiving net 17. The threshing drum 20 performs threshing processing on the threshed material located in the threshing processing space S2 (see FIG. 2) between the outer circumferential surface of the threshing drum and the receiving net 17 by striking with the front divided threshing tooth support member 27a, the rear divided threshing tooth support member 27b and the threshing teeth 28, combing with the threshing teeth 28, etc., allows the processed material obtained by this threshing processing to enter the internal space S1, and while mixing the processed material in the threshing processing space S2 and the processed material in the internal space S1, performs threshing processing on these processed materials by striking with the front divided threshing tooth support member 27a, the rear divided threshing tooth support member 27b and the threshing teeth 28, combing with the threshing teeth 28, etc.

[0044] [Configuration of the dust sending valve] 2 and 4, in the upper part of the handling chamber 16, a plurality of dust sending valves 30 aligned in a direction along the rotation axis P of the handling drum 20 are provided on the inner part of the top plate 19. In this embodiment, ten dust sending valves 30 are provided, but nine or less or eleven or more dust sending valves 30 may be provided.

[0045] 2 and 4, the foremost dust transfer valve 30A of the ten dust transfer valves 30 and the dust transfer valve 30A adjacent to the foremost dust transfer valve 30A are provided above a portion K1 in the handling chamber 16 where the raking section 20A of the handling drum 20 is located. The foremost dust transfer valve 30A and the dust transfer valve 30A adjacent to the foremost dust transfer valve 30A are dust transfer valves for raking in which the harvested stalks that are to be raked in by the raking section 20A are sent and guided toward the rear of the handling chamber 16.

[0046] As shown in Figs. 2 and 4, of the ten dust sending valves 30, eight dust sending valves 30B, excluding the two dust sending valves 30A for raking in, are provided above the portion K2 of the threshing chamber 16 where the threshing processing section 20B of the threshing drum 20 is located. The rear end of the portion K2 of the threshing chamber 16 faces the front of the stalk discharge section 16b. The eight dust sending valves 30B are threshing processing-compatible dust sending valves that send and guide the threshing processing material to be threshed by the threshing processing section 20B toward the rear of the threshing chamber 16. In this embodiment, eight threshing processing-compatible dust sending valves 30B are provided, but seven or fewer or nine or more threshing processing-compatible dust sending valves 30B may be provided.

[0047] [Configuration of dust sending valve for scraping] As shown in Fig. 4, each of the two dust-sending valves 30A corresponding to the two sweeping-in is provided on the inner portion of the top plate 19 with the feed angle Θ2 fixed so as not to be changeable. The two dust-sending valves 30A corresponding to the two sweeping-in are fixed to the top plate 19 by welding.

[0048] [Configuration of dust sending valve for sieving process] Each of the eight dust transport valves 30B compatible with the handling process has a first dust transport member 31 provided on the inner part of the top plate 19 in a state extending in the left-right direction of the handling chamber 16 at the top of the handling chamber 16, as shown in Figures 3 and 4, and a second dust transport member 32 provided on the upper part of the handling chamber upstream of the first dust transport member 31 in the direction of rotation of the handling drum 20.

[0049] As shown in FIG. 3, the central portion 19a of the top plate 19 in the left-right direction of the handling chamber is formed to be flat when viewed in the direction along the rotation axis P of the handling drum 20. That is, the cross-sectional shape of the central portion 19a is flat when viewed in the direction along the rotation axis P. The upstream side portion 19b of the top plate 19, which is adjacent to the central portion 19a on the upstream side of the handling drum rotation direction, is formed to be arc-shaped when viewed in the direction along the rotation axis P of the handling drum 20. That is, the cross-sectional shape of the upstream side portion 19b is arc-shaped when viewed in the direction along the rotation axis P. The downstream side portion 19c of the top plate 19, which is adjacent to the central portion 19a on the downstream side of the handling drum rotation direction, is formed to be flat and inclined downward and outward of the handling chamber when viewed in the direction along the rotation axis P of the handling drum 20. That is, the cross-sectional shape of the lower side side portion 19c is flat when viewed in the direction along the rotation axis P.

[0050] 3, the first dust-transporting member 31 is provided on the inside of the central portion 19a of the top plate 19. The upper edge portion 31a facing the central portion 19a of the first dust-transporting member 31 is formed in a straight line along the central portion 19a. A downstream-side dust-transporting portion 31b extending along the downstream side portion 19c of the top plate 19 is provided at a portion of the first dust-transporting member 31 on the downstream side in the rotation direction of the handling drum.

[0051] 3 and 4, the first dust sending member 31 is provided with a shaft 33 at a position downstream of the center C in the left-right direction of the handling chamber in the direction of rotation of the handling drum and upstream of the downstream-side dust sending section 31b in the direction of rotation of the handling drum, and a boss section 34 supporting the shaft 33 is provided at an end of the central section 19a of the top plate 19. The first dust sending member 31 is supported by the top plate 19 in a state in which it can swing around an axis Y of the shaft 33 extending in the vertical direction of the handling chamber as a swing fulcrum. The feed angle of the first dust sending member 31 can be changed by swinging the first dust sending member 31 around the axis Y as a swing fulcrum.

[0052] As shown in Figures 3 and 4, each of the eight second dust-transporting members 32 is fixed to the inside of the upstream side 19b of the top plate 19 so that the feed angle Θ3 cannot be changed. The upstream side 19b of the top plate 19 faces the second dust-transporting member 32 and is formed in an arc shape when viewed in a direction along the rotation axis P of the handling drum 20. The second dust-transporting member 32 is fixed to the upstream side 19b of the top plate 19. The second dust-transporting member 32 is fixed to the upstream side 19b of the top plate 19 by connecting a part of the second dust-transporting member 32 on the downstream side in the rotation direction of the handling drum to the side 19b with a connecting bolt, and by inserting a protrusion provided on one of the second dust-transporting member 32 and the side 19b into a recessed part provided on the other of the second dust-transporting member 32 and the side 19b at a part upstream of the connecting bolt in the rotation direction of the handling drum.

[0053] As shown in FIG. 4, the feed angle of each of the eight first dust-conveying members 31 can be changed within an angle range spanning a feed angle Θ1 which is the gentlest angle, and a feed angle Θ2 which is the steepest angle. The feed angle Θ3 between the feed angle Θ1 and the feed angle Θ2 of the first dust conveying member 31 is the same as the feed angle Θ3 of the eight second dust conveying members 32. The feed angle Θ2 of the first dust conveying member 31 is the same as the feed angle Θ2 of each of the two dust conveying valves 30A for scraping. Each line A shown in Fig. 4 is a line perpendicular to the rotation axis P, which is the axis of the handling drum 20, in a plan view, and is a reference line showing the feed angles of the first dust conveying member 31, the second dust conveying member 32, and the dust conveying valve 30A.

[0054] 3 and 4, there is provided a first feed angle adjustment mechanism 35 which adjusts the feed angle of the front four first dust conveying members 31 by interlocking and swinging the first four first dust conveying members 31 out of the eight first dust conveying members 31. There is provided a second feed angle adjustment mechanism 36 which adjusts the feed angle of the rear four first dust conveying members 31 by interlocking and swinging the remaining four first dust conveying members 31 out of the eight first dust conveying members 31 except for the front four first dust conveying members 31, i.e., the rear four first dust conveying members 31 out of the eight first dust conveying members 31.

[0055] 3 and 4, the first feed angle adjustment mechanism 35 includes an interlocking link 37 that pivots the end of each of the front four first dust-transmitting members 31 opposite the side where the support shaft 33 is located and interlocks and connects the front four first dust-transmitting members 31, and an adjustment lever 38 that is connected to the support shaft 33 of the foremost first dust-transmitting member 31 among the front four first dust-transmitting members 31. A screw shaft 39 is engaged with the adjustment lever 38, and an adjustment motor 40 is interlocked and connected to the screw shaft 39. The adjustment motor 40 is constituted by an electric motor.

[0056] 3 and 4, 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 is provided with an interlocking link 37 that interlocks and connects the rear four first dust-transmitting members 31, an adjustment lever 38 connected to the support shaft 33 of the foremost first dust-transmitting member 31 of the rear four first dust-transmitting members 31, a screw shaft 39 engaged with the adjustment lever 38, and an adjustment motor 40 interlocked and connected to the screw shaft 39.

[0057] In the first feed angle adjustment mechanism 35 and the second feed angle adjustment mechanism 36, when the adjustment motor 40 is driven, the screw shaft 39 is rotated by the adjustment motor 40, the adjustment lever 38 is swung by the screw shaft 39, and the support shaft 33 is rotated by the adjustment lever 38, so that the foremost first dust sending member 31 is swung about the support shaft 33. The operation of the foremost first dust sending member 31 is transmitted to the other three first dust sending members 31 by the interlocking link 37, and the other three first dust sending members 31 are swung about the support shaft 33 as a swing fulcrum in the same swing direction as the foremost first dust sending member 31 and by the same swing angle as the foremost first dust sending member 31.

[0058] As shown in FIG. 4, a control device 41 is connected to the adjustment motor 40 of the first feed angle adjustment mechanism 35 and the adjustment motor 40 of the second feed angle adjustment mechanism 36, and a first adjustment switch 42 and a second adjustment switch 43 are connected to the control device 41.

[0059] 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 information from the first adjustment switch 42 and the preset set feed angle to swing the front four first dust-conveying members 31 and adjust the feed angle of each of the front four first dust-conveying members 31.

[0060] 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 information from the second adjustment switch 43 and the preset set feed angle to swing the last four first dust conveying members 31 and adjust the feed angle of each of the last four first dust conveying members 31.

[0061] As shown in FIG. 4, the feed angle adjustment of each of the front four first dust-transporting members 31 and the rear four first dust-transporting members 31 is performed by the power of the adjustment motor 40 within an angle range having the gentlest feed angle Θ1 and the steepest feed angle Θ2.

[0062] By appropriately operating the first adjustment switch 42 and the second adjustment switch 43, it is possible to adjust the feed angles of the eight first dust-conveying members 31 to the same feed angle. Also, for example, it is possible to adjust the feed angles of the front four first dust-conveying members 31 and the rear four first dust-conveying members 31 to different feed angles.

[0063] 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, even if the threshed material is subjected to a rotating force by the threshing drum 20 and flows upward through the handling chamber 16 and hits the upper side 19b of the top plate 19, it does not encounter much flow resistance due to the arc shape of the side 19b and flows smoothly, hits the second dust conveying member 32 with force and is guided by the second dust conveying member 32, and further, the threshed material hits the first dust conveying member 31 with force and is transported toward the rear of the handling chamber 16 by the guide of the first dust conveying member 31 at the feed angle adapted to the quality of the crop, and the threshed material is threshed while moving backward through the handling chamber 16 at a moving speed adapted to its quality.

[0064] 3, a gap Z is provided between an upper edge 31c of the downstream dust sending section 31b of the first dust sending member 31 and a side section 19c of the top plate 19. Even if threshed material gets between the downstream dust sending section 31b and the side section 19c, the gap Z allows the material to easily slip out from between the downstream dust sending section 31b and the side section 19c.

[0065] 3, a notch 44 is formed in the lower corner of the first dust sending member 31 on the upstream side in the threshing drum rotation direction. When viewed in the direction along the rotation axis P of the threshing drum 20, the end 32a of the second dust sending member 32 on the downstream side in the threshing drum rotation direction is configured to fit into the notch 44. Even if the end 31d of the first dust sending member 31 on the upstream side in the threshing drum rotation direction and the end 32a of the second dust sending member 32 on the downstream side in the threshing drum rotation direction are misaligned in the front-rear direction of the threshing chamber due to a change in the feed angle of the first dust sending member 31, the threshed material from the second dust sending member 32 is unlikely to get caught on the end 31d of the first dust sending member 31 and moves smoothly to the first dust sending member 31.

[0066] 3, the length L1 by which the end 31d on the upstream side in the rotation direction of the threshing drum of the first dust sending member 31 projects from the top plate 19 toward the threshing drum 20 is the same as the length L2 by which the end 32a on the downstream side in the rotation direction of the threshing drum of the second dust sending member 32 projects from the top plate 19 toward the threshing drum 20. No step is formed between the second dust sending member 32 and the first dust sending member 31 in the radial direction of the threshing drum.

[0067] [Another embodiment] (1) In the above embodiment, an example in which a cage-shaped threshing drum 20 is used has been described, but the present invention is not limited to this. For example, a drum-shaped threshing drum, a threshing drum equipped with rasp threshing teeth, or a threshing drum combining a drum portion and a cage-shaped portion may be used.

[0068] (2) In the above embodiment, an example is shown in which the handling drum support shaft 21 is erected in an inclined position with the rear raised, but it may be supported in a horizontal position.

[0069] (3) In the above embodiment, an example was shown in which the handling tooth support member was divided into a front divided handling tooth support member 27a and a rear divided handling tooth support member 27b, but the handling tooth support member may also be a single, undivided member.

[0070] (4) In the above embodiment, the first dust-transporting member 31 includes the downstream-side dust-transporting portion 31b. However, the first dust-transporting member 31 may not include the downstream-side dust-transporting portion 31b.

[0071] (5) In the above embodiment, an example was shown in which the protruding length L1 of the first dust transporting member 31 and the protruding length L2 of the second dust transporting member 32 are the same, but the protruding length L1 of the first dust transporting member 31 and the protruding length L2 of the second dust transporting member 32 may be different. This is also fine.

[0072] (6) In the above embodiment, an example in which eight first dust transport members 31 and eight second dust transport members 32 are provided is shown, but the present invention is not limited to this. For example, seven or fewer, or nine or more, first dust transport members 31 and second dust transport members 32 may be provided. In addition, in the above embodiment, an example in which the front four first dust transport members 31 and the rear four first dust transport members 31 can be adjusted to swing separately is shown, but all first dust transport members 31 may be adjusted to swing in conjunction with each other. In addition, the swing adjustment of the first dust transport members 31 may be performed manually, not by an actuator. [Industrial Applicability]

[0073] The present invention can be applied to a combine harvester in which a threshing device for threshing crops from a harvesting section is provided with a threshing chamber, a threshing drum rotatably arranged in the threshing chamber, a top plate covering the top of the threshing chamber, and a number of dust-delivery valve sections supported on the inside of the top plate in a state aligned in a direction along the rotation axis of the threshing drum, and which send and guide the threshed material toward the rear of the threshing chamber. [Explanation of symbols]

[0074] 6A Reaping part 7. Threshing Equipment 16 Handling room 19b Part (side) 19c Side 20 Handling Body 30B Dust feeding valve 31 First dust conveying member 31b Lower side dust sending section 31c Upper edge 31d end 32 Second dust conveying member 32a end 33 Spindle 44 Notch C center K Gap L1 protrusion length L2 protrusion length P Rotation shaft center Z Gap

Claims

1. A reaping unit that reaps crops planted in a field; A threshing device that threshes the crops from the reaping unit is provided. The threshing device is provided with a threshing chamber into which crops are fed from the reaping section, a threshing drum that is rotatably provided in the threshing chamber and performs threshing processing of the crops fed into the threshing chamber, a top plate that covers the top of the threshing chamber, and a plurality of dust-transfer valves that are provided on the inner part of the top plate in a state aligned in a direction along the rotation axis of the threshing drum and that send and guide the threshed material toward the rear of the threshing chamber, The plurality of dust-transport valves include a first dust-transport member provided in an upper portion of the handling chamber so as to extend in the left-right direction of the handling chamber and so as to be capable of changing a feed angle by swinging, and a second dust-transport member provided in the upper portion of the handling chamber at a portion upstream of the first dust-transport member in the rotation direction of the handling drum and fixed so that the feed angle cannot be changed, A portion of the top plate facing the second dust-conveying member is arc-shaped when viewed in a direction along the rotation axis, The first dust-transporting member has a notch portion formed in a lower corner portion on the upstream side in the rotation direction of the threshing drum of the first dust-transporting member, A combine harvester configured such that, when viewed in a direction along the rotation axis, the end portion of the second dust conveying member downstream in the direction of rotation of the threshing drum fits into the cutout portion.

2. The side of the top plate on the lower side in the rotation direction of the throttling drum is downward and inclined outwardly to the side of the throttling chamber, 2. The combine harvester according to claim 1, wherein a downstream-side dust-transporting portion extending along the side portion is provided at a downstream portion of the first dust-transporting member in the rotation direction of the threshing drum.

3. 3. The combine harvester according to claim 2, wherein a gap is provided between the side portion and an upper edge portion of the downstream dust sending portion.

4. A combine harvester as described in claim 2 or 3, wherein the first dust conveying member has a support shaft provided at a position located downstream of the center of the handling chamber in the left-right direction of the first dust conveying member in the direction of rotation of the handling drum and upstream of the downstream dust conveying section in the direction of rotation of the handling drum, and is supported in a swingable state with the support shaft as a swing fulcrum.

5. A combine harvester as described in any one of claims 1 to 4, wherein the protruding length of the end of the first dust conveying member on the upstream side in the direction of rotation of the threshing drum from the top plate toward the threshing drum is the same as the protruding length of the end of the second dust conveying member on the downstream side in the direction of rotation of the threshing drum from the top plate toward the threshing drum.

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