CN110933997B

CN110933997B - Threshing device and combine harvester

Info

Publication number: CN110933997B
Application number: CN201910589647.5A
Authority: CN
Inventors: 梅林竜司; 永田哲治; 永翁和明; 米田豊; 高木雅志; 栗林巧
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2018-09-21
Filing date: 2019-06-27
Publication date: 2023-06-27
Anticipated expiration: 2039-06-27
Also published as: CN110933997A; KR20200034568A

Abstract

The invention relates to a threshing device and a combine harvester. Threshing devices having excellent operability of threshing drums are expected. The threshing device (9) is provided with: a threshing cylinder (12) arranged in the threshing chamber (18), and a threshing chamber cover (39) which covers the threshing cylinder (12) from above and can be opened and closed. The threshing cylinder (12) has: a threshing cylinder shaft (20) extending along the front-back direction, and a main body (42) which is supported by the threshing cylinder shaft (20) and is provided with a plurality of threshing teeth (41) at the outer periphery. The main body (42) has a plurality of main body parts (48) which are formed by dividing the main body (42) back and forth and integrally rotate. The main body (48) is a circumferentially divided main body having a plurality of main body structural members (57, 58) which are configured by dividing the main body (48) in the circumferential direction around the threshing cylinder shaft (20). The main body structural members (57, 58) are configured to be detachable and to be capable of passing through an upper opening (18 a) of the threshing chamber (18) in a state where the threshing chamber cover (39) is opened.

Description

Threshing device and combine harvester

Technical Field

The present invention relates to a threshing device provided with a threshing cylinder provided in a threshing chamber.

The present invention also relates to a combine harvester including: the threshing device comprises a supply chain for clamping and conveying the harvested straws, a threshing device provided with a threshing cylinder and used for threshing the harvested straws conveyed by the supply chain, and a waste straw conveying device which is connected to the rear part of the threshing device and used for collecting the waste straws after threshing treatment from the supply chain and carrying out clamping and conveying to the rear part.

The present invention also relates to a threshing device including a threshing cylinder provided in a threshing chamber and a threshing cylinder frame supporting the threshing cylinder and capable of swinging up and down.

Background

As the threshing device, for example, a threshing device described in patent document 1 is known as the first aspect. The threshing device described in patent document 1 is provided with a threshing cylinder (in this document, "threshing cylinder (10)") provided in a threshing chamber (in this document, "threshing chamber (2)"). The threshing cylinder comprises: a threshing cylinder shaft (in this document, a "supporting shaft [ 30 ])" extending in the front-rear direction, and a main body (in this document, a "threshing cylinder [ 31 ]) which is supported by the threshing cylinder shaft and has a plurality of threshing teeth (in this document, threshing teeth [ 35 ], [ 36 ]) mounted on the outer periphery thereof. The body is formed of a unitary body portion spanning the entire length thereof.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2010-68752

In the threshing device described in patent document 1, it is necessary to integrally operate the entire body when assembling and maintaining the threshing cylinder, which is relatively laborious.

As the second aspect, as the combine harvester described above, for example, a combine harvester described in patent document 2 is known. Patent document 2 discloses a combine harvester including: a supply chain (in this document, "supply chain (9)") for carrying the harvested stalks; a threshing device (in this document, a "threshing device (10)") which has a threshing cylinder (in this document, a "threshing cylinder (11)") and performs threshing treatment on the harvested stalks conveyed by the supply chain; and a waste straw conveying device (in this document, a "waste straw conveying device (12)") which is connected to the rear part of the threshing device, and which receives the waste straw after the threshing process from the supply chain and performs gripping conveyance to the rear.

The combine described in patent document 2 includes: a threshing cylinder frame (in this document, an "upper frame (40)") which supports the threshing cylinder and is capable of swinging up and down around a front-rear direction axis (in this document, a "swing axis (Y2)") located on the inner side of the machine body in the lateral direction; a waste straw frame (in this document, a "waste straw frame (50)") which supports the waste straw conveying device and is capable of swinging up and down about a front-rear direction axis (in this document, a "swing axis (Y2)") located at a laterally inner side of the machine body; a connecting member (in this document, a "connecting mechanism (87)") which is provided across the body-side outer end portion of the threshing cylinder frame and the body-side outer end portion of the waste straw frame and connects the threshing cylinder frame and the waste straw frame to be able to be disconnected; and a threshing chamber cover (in this document, an "upper cover [ 38 ]) covering the threshing cylinder, the threshing cylinder frame, and the waste straw frame from above. In the combine described in patent document 2, the threshing cylinder frame and the waste straw frame are integrally swingable up and down while being connected by a connecting member.

Prior art literature

Patent literature

Patent document 2: japanese patent laid-open publication No. 2018-102145

In the combine described in patent document 2, when the threshing chamber cover is opened and closed by swinging up and down about a front-rear direction axis located on the outer side in the lateral direction of the machine body, a portion of the threshing chamber cover corresponding to the coupling member is likely to interfere with the coupling member.

As for the third aspect, as the threshing device described above, for example, a threshing device described in patent document 2 is known. The threshing device described in patent document 2 includes: a threshing cylinder (in this document, "threshing cylinder (11)") provided in the threshing chamber (in this document, "threshing chamber (17)"), and a cylinder frame (in this document, "upper frame (40)") which supports the threshing cylinder and is capable of swinging up and down. In the threshing device described in patent document 2, maintenance of the threshing cylinder can be performed from the left side of the threshing device in a state where the threshing cylinder frame is located at the raised position.

Prior art literature

Patent literature

Patent document 2: japanese patent laid-open publication No. 2018-102145

In the threshing device described in patent document 2, maintenance of the threshing cylinder of the threshing device can be performed only in one direction (the left side portion of the threshing device), and there is room for improvement in terms of improving the maintainability of the threshing cylinder.

Disclosure of Invention

In view of the above, a threshing device having excellent operability of a threshing cylinder is desired.

The present invention is characterized by comprising: a threshing cylinder arranged in the threshing chamber; and a threshing chamber cover capable of opening and closing, wherein the threshing cylinder is provided with a threshing cylinder shaft extending along the front-back direction and a main body which is supported on the threshing cylinder shaft and is provided with a plurality of threshing teeth at the periphery, the main body is provided with a plurality of main body parts which are formed by dividing the main body in the front-back direction and integrally rotate, at least one main body part of the plurality of main body parts is a circumferential divided main body part which is provided with a plurality of main body part structural components formed by dividing the main body part in the circumferential direction around the threshing cylinder shaft, and at least one main body part structural component of the plurality of main body part structural components is configured to be capable of being assembled and disassembled and is configured to be capable of passing through an upper opening of the threshing chamber when the threshing chamber cover is opened.

According to this feature, the main body is divided into the plurality of main body portions and operated at the time of assembling and maintaining the threshing cylinder, so that labor is reduced as compared with the case where the whole main body is operated integrally. Further, by removing the main body structural member, the hand can be inserted into the main body from the opening of the main body from which the main body structural member is removed, and maintenance of the threshing cylinder (for example, fastening or loosening of a bolt for fixing the main body to the threshing cylinder shaft, replacement of the threshing teeth, and the like) can be easily performed. In this case, the main body structural member is taken out or put in from the upper opening of the threshing chamber, whereby the main body structural member can be easily attached or detached. That is, according to the present feature, a threshing device having excellent operability of the threshing cylinder can be realized.

In the present invention, it is preferable that all of the plurality of main body structural members are configured to be detachable, and that all of the plurality of main body structural members are configured to pass through the upper opening in a state where the threshing chamber cover is opened.

According to this feature, since the opening of the main body at the portion from which the main body structural member is removed is increased by removing all the main body structural member, maintenance of the threshing cylinder can be performed more easily. In this case, by taking out or putting in all the main body structural members from the upper opening of the threshing chamber, the entire main body structural members can be easily attached and detached.

In the present invention, it is preferable that the plurality of main body structural members are configured by equally dividing the main body in the circumferential direction.

According to this feature, the main body structural members are uniform in size. This makes it easy to make the main body structural members universal or to equalize the strength of the main body structural members.

In the present invention, it is preferable that the main body is divided into three main body portions in the front-rear direction, and the other main body portions are respectively present in the front-rear two adjacent portions of the circumferentially divided main body portion, and the circumferentially divided main body portion is longer in the front-rear direction than the main body portions in the front-rear two adjacent portions of the circumferentially divided main body portion.

According to this feature, the opening in the main body at the portion from which the main body structural member is removed is long in the front-rear direction. In this way, when the threshing cylinder is maintained, the hand is easily inserted into the body from the opening of the body from which the body structural member is removed, and the hand is easily inserted into the body adjacent to the front of the circumferentially divided body and the body adjacent to the rear of the circumferentially divided body.

In the present invention, it is preferable that the body portion adjacent to the front of the circumferentially divided body portion is shorter in the front-rear direction than the body portion adjacent to the rear of the circumferentially divided body portion.

Here, a reduced diameter portion having a diameter smaller toward the front is generally provided at the front end portion of the threshing cylinder. According to this feature, even when the reduced diameter portion is provided so as to be connected to the front end portion of the main body portion adjacent to the front of the circumferentially divided main body portion, the front-rear length of the portion of the threshing cylinder on the front side of the circumferentially divided main body portion can be made the same as the front-rear length of the portion on the rear side of the circumferentially divided main body portion, and the front-rear balance can be improved.

In view of the above, a second aspect of the present invention is directed to a combine harvester in which a portion of a threshing chamber cover corresponding to a connecting member does not interfere with the connecting member when the threshing chamber cover is opened and closed.

The present invention is characterized in that the combine harvester comprises: a supply chain for clamping and conveying the harvested cereal stalks; a threshing device which is provided with a threshing cylinder and performs threshing treatment on the harvested cornstalks conveyed by the supply chain; and a waste straw conveying device which is connected to the rear part of the threshing device and receives the waste straw subjected to threshing treatment from the supply chain and carries out clamping conveying to the rear, wherein the combine harvester comprises: a threshing cylinder frame which supports the threshing cylinder and can swing up and down around a front-back direction shaft positioned at the inner side of the machine body; a waste straw frame supporting the waste straw conveying device and capable of swinging up and down around a front-rear direction axis positioned at the inner side of the machine body in the transverse direction; a connecting member which is provided across the body lateral outer end of the threshing cylinder frame and the body lateral outer end of the waste straw frame and which connects the threshing cylinder frame and the waste straw frame to be able to be disconnected; and a threshing chamber cover that covers the threshing cylinder, the threshing cylinder frame, and the waste straw frame from above and is capable of swinging up and down about a front-rear direction axis located on a lateral outer side of the machine body, wherein the threshing cylinder frame and the waste straw frame are capable of swinging up and down integrally in a state in which the threshing cylinder frame and the waste straw frame are connected by the connecting member, a portion of the threshing chamber cover corresponding to the connecting member is composed of a cover member other than a main body of the threshing chamber cover, and the cover member is attached to the connecting member.

According to this feature, the threshing chamber cover is attached to the connecting member while the portion corresponding to the connecting member is constituted by a cover member different from the main body. Thus, even when the main body is opened and closed, the portion (cover member) of the threshing chamber cover corresponding to the connecting member is not opened and closed, and remains on the connecting member side. Therefore, when the threshing chamber cover is opened and closed, the portion of the threshing chamber cover corresponding to the connecting member does not interfere with the connecting member.

In the present invention, it is preferable that the cover member is configured to be detachable from the connecting member in a state where the main body is closed.

According to this feature, since the main body does not need to be opened when the cover member is attached and detached, the attachment and detachment operation of the cover member can be easily performed.

In the present invention, it is preferable that the coupling member is configured to be exposed by removing the cover member.

According to this feature, the cover member is removed without opening the main body when the connection member is disconnected, so that the disconnection operation can be easily performed.

In the present invention, it is preferable that a gap is formed between the main body and the cover member in a closed state in a plan view, and a bolt for detachably fixing the cover member to the connecting member is positioned in the gap.

According to this feature, the bolt can be operated from the gap between the main body and the cover member without opening the main body when the cover member is attached and detached, and the cover member can be easily attached and detached.

In view of the above, a threshing device capable of improving maintainability of a threshing cylinder is desired.

The present invention is characterized by comprising: a threshing cylinder arranged in the threshing chamber; a threshing cylinder frame which supports the threshing cylinder and can swing up and down around a front-rear direction shaft; a threshing chamber cover capable of opening and closing, which covers the threshing cylinder and the threshing cylinder frame from above; and a holding mechanism for holding the threshing chamber cover in an open state in a state where the threshing cylinder frame is located at the raised position.

According to this feature, the threshing chamber cover is held in an open state by the holding mechanism in a state where the threshing cylinder frame is located at the raised position, so that the threshing cylinder can be maintained in two directions (the lateral side portion and the upper portion of the threshing device). That is, according to the present feature, a threshing device capable of improving maintainability of a threshing cylinder can be realized.

In the present invention, it is preferable that the threshing chamber cover extends to a position on the rear side of the rear end of the threshing cylinder, and the holding mechanism is configured to support the rear portion of the threshing chamber cover.

According to this feature, even if the threshing chamber cover extends to a position on the rear side of the rear end of the threshing cylinder, the rear part of the threshing chamber cover can be firmly supported.

In the present invention, it is preferable that the holding mechanism is provided across a rear portion of the threshing chamber cover and a rear wall of the threshing chamber.

According to this feature, the holding mechanism is supported by the relatively rigid rear wall. Thereby, the holding mechanism can be firmly supported.

In the present invention, it is preferable that the rear wall has a fixed wall and a movable wall that supports the threshing cylinder and is capable of swinging up and down with respect to the fixed wall, and that the holding mechanism is provided across the rear portion of the threshing chamber cover and the movable wall.

According to this feature, the holding mechanism changes its position together with the movable wall when the movable wall swings up and down relative to the fixed wall. Thus, even if the movable wall swings up and down with respect to the fixed wall, the structure of the holding mechanism is not affected.

In the present invention, it is preferable that the holding mechanism is constituted by a gas damper.

According to this feature, the holding and releasing of the threshing chamber cover can be easily performed.

In the present invention, it is preferable that the threshing cylinder has a threshing cylinder shaft extending in a front-rear direction and a main body supported by the threshing cylinder shaft and having a plurality of threshing teeth attached to an outer peripheral portion thereof, the main body has a plurality of main body portions configured by dividing the main body in a front-rear direction and integrally rotating, at least one of the plurality of main body portions has a plurality of main body portion structural members configured by dividing the main body portion in a circumferential direction around the threshing cylinder shaft, and at least one of the plurality of main body portion structural members is configured to be detachable.

According to this feature, by detaching the main body structural member, the hand can be inserted into the main body from the opening of the main body from which the main body structural member is detached, and maintenance of the threshing cylinder (for example, replacement of threshing teeth or the like) can be easily performed. In this case, the threshing device is replaced with the threshing teeth from two directions (lateral side and upper side of the threshing device), so that these operations can be easily performed without rotating the threshing cylinder to a large extent.

Drawings

First embodiment

Fig. 1 is a left side view showing a combine harvester.

Fig. 2 is a plan view showing the combine harvester.

Fig. 3 is a left side cross-sectional view showing the threshing device.

Fig. 4 is a front cross-sectional view showing the threshing device.

Fig. 5 is a front cross-sectional view of the threshing device showing a state in which the threshing chamber cover and the right cover are opened.

Fig. 6 is a plan view showing a state in which the threshing cylinder is provided in the threshing chamber.

Fig. 7 is a perspective view showing a state in which the threshing cylinder is provided in the threshing chamber.

Fig. 8 is a left side cross-sectional view showing the threshing cylinder.

Fig. 9 is an exploded perspective view showing the threshing cylinder.

Fig. 10 is an X-X cross-sectional view of fig. 8.

Fig. 11 is a perspective view showing a rear body portion mounting process.

Fig. 12 is a perspective view showing a front body portion mounting process.

Fig. 13 is a perspective view showing the first middle body portion structural plate.

Fig. 14 is a perspective view showing the second middle body portion structural plate.

Fig. 15 (a) is a diagram showing a method of removing one of the second middle body structural plates. (b) The second middle body structural plate is a diagram showing a method of removing the other middle body structural plate. (c) A method of removing one of the first middle body structural plates is shown. (d) The first middle body structural plate is a diagram showing a method of removing the other middle body structural plate.

Second embodiment

Fig. 16 is a left side view showing the combine harvester.

Fig. 17 is a plan view showing the combine harvester.

Fig. 18 is a left side view showing the threshing device.

Fig. 19 is a rear view of the threshing device showing a state in which the threshing cylinder frame is lowered.

Fig. 20 is a rear view of the threshing device showing a state in which the threshing cylinder frame is raised.

Fig. 21 is a front view showing a threshing cylinder locking mechanism.

Fig. 22 is a perspective view showing a structure around the support shaft.

Fig. 23 is an exploded perspective view showing the attachment structure of the root cover.

Fig. 24 is a rear cross-sectional view showing the mounting structure of the root cover.

Fig. 25 is a left side view showing the rear part of the threshing device and the waste straw conveying device.

Fig. 26 is a perspective view showing the left upper frame, the right upper frame, the waste straw frame, the first rear upper frame, and the second rear upper frame.

Fig. 27 is a plan view showing the rear part of the threshing device, the waste straw conveying device, and the waste straw cutting device.

Fig. 28 is a rear view showing a state where the threshing cylinder frame and the waste straw frame are positioned at the lowered position.

Fig. 29 is a rear view showing a state where the waste straw frame and the threshing cylinder frame are positioned at the second raised position.

Fig. 30 is an exploded perspective view showing the left upper frame, the waste straw frame, and the first rear upper frame.

Fig. 31 is an exploded perspective view showing a waste straw frame and a right upper frame.

Fig. 32 is a plan view showing the auxiliary cover.

Fig. 33 is a rear cross-sectional view showing the auxiliary cover.

Fig. 34 is a rear view showing a state in which the waste straw frame is located at the lowered position.

Fig. 35 is a rear view showing a state in which the waste straw frame is located at the second rising position.

Fig. 36 is a rear view showing a state in which the waste straw frame is located at the first rising position.

Fig. 37 is a rear view showing the lock mechanism and the interlocking mechanism.

Fig. 38 is an exploded perspective view showing the lock mechanism.

Fig. 39 is a plan view showing the locking mechanism in a state where the waste straw frame is positioned in a range of the lower position to the second raised position and the waste straw cutting device is positioned at the working position.

Fig. 40 is a left side view of the locking mechanism showing a state where the waste straw frame is located in a range of the lower position to the lower position and the second raised position and the waste straw cutting device is located at the working position.

Fig. 41 is a left side view showing the locking mechanism in a state where the waste straw frame is located at the first raised position and the waste straw cutting device is located at the working position.

Fig. 42 is a diagram showing the relationship among the position of the waste straw frame, the state of the locking mechanism, and the possibility of switching the waste straw cutting device.

Fig. 43 is a view showing whether the waste straw cutting device is switchable in a state where the waste straw frame is positioned at the lowered position.

Fig. 44 is a view showing whether the waste straw cutting device is switchable in a state in which the waste straw frame is positioned at the second raised position.

Fig. 45 is a view showing whether or not the waste straw cutting device is switchable in a state in which the waste straw frame is positioned at the first raised position.

Fig. 46 is a plan view showing a state in which the lock mechanism is in the restricted state and the waste straw cutting device is located at the working position.

Fig. 47 is a plan view showing a state in which the lock mechanism is in the restricted state and the waste straw cutting device is located at the first lock position.

Fig. 48 is a plan view showing a state in which the lock mechanism is in the restricted state and the waste straw cutting device is in the non-working position.

Fig. 49 is a plan view showing a state in which the lock mechanism is in the restricted state and the waste straw cutting device is located at the second lock position.

Fig. 50 is a diagram showing a relationship between the position of the waste straw cutting device and the swing limit of the waste straw cutting device by the lock mechanism.

Fig. 51 is a perspective view showing a waste straw receiving hood.

Fig. 52 is a left side cross-sectional view showing the waste straw receiving hood.

Fig. 53 is a plan view showing the switching plate.

FIG. 54 is a cross-sectional view of XXXIX-XXXIX in FIG. 53.

Third embodiment

Fig. 55 is a left side view showing the combine harvester.

Fig. 56 is a plan view showing the combine harvester.

Fig. 57 is a left side view showing the threshing device.

Fig. 58 is a front cross-sectional view showing the threshing device.

Fig. 59 is a rear view showing the threshing device.

Fig. 60 is a left side cross-sectional view showing the threshing cylinder.

Fig. 61 is an exploded perspective view showing the threshing cylinder.

Fig. 62 is a cross-sectional view of VIII-VIII in fig. 60.

Fig. 63 is a front cross-sectional view showing a state in which the left threshing chamber cover is held in an open state in a state in which the threshing cylinder frame is located at the raised position.

Fig. 64 is a front cross-sectional view showing a state in which the left threshing chamber cover is held in an open state in another embodiment.

Fig. 65 is a perspective view showing a lock mechanism for the right threshing chamber cover.

Fig. 66 is a rear view showing a state in which the right threshing chamber cover is held in an open state.

Description of the reference numerals

First embodiment

9. Threshing device

12. Threshing cylinder

18. Threshing chamber

18a upper opening

20. Threshing cylinder shaft

39. Threshing chamber cover

41. Threshing teeth

42. Main body

46. Front main body part

47. Rear main body part

48. Middle body (circumference dividing body)

57. First middle body structural plate (body structural component)

58. Second middle body structural plate (body structural component)

Second embodiment

9. Threshing device

10. Supply chain

12. Threshing cylinder

13. Waste straw conveying device

38. Threshing cylinder frame

61. Waste straw frame

92. Connecting plate (connecting parts)

97. Left threshing chamber cover

100. Main body

101. Auxiliary hood (hood parts)

102. Bolt

S1 gap

Y2 front-rear direction axle center

Y4 front-rear direction axle center

Third embodiment

9. Threshing device

12. Threshing cylinder

18. Threshing chamber

20. Threshing cylinder shaft

21. Rear wall

32. Movable wall

33. Fixed wall

38. Threshing cylinder frame

41. Threshing teeth

42. Main body

46. Front main body part

47. Rear main body part

48. Middle main body part

57. First middle body structural plate (body structural component)

58. Second middle body structural plate (body structural component)

71. Left threshing chamber cover

76. Gas damper (holding mechanism)

Y2 front-rear direction axle center

Detailed Description

First embodiment

The mode for carrying out the invention is explained based on the drawings.

[ integral Structure of combine harvester ]

Fig. 1 and 2 show a semi-fed combine harvester. The combine is provided with a frame 1 and a crawler travel device 2. A harvesting part 3 for harvesting the upright cornstalks is arranged at the front part of the travelling machine body. A cab 4 is provided at a right portion of a front portion of the traveling machine body. The cab 4 includes a cab 5 on which a driver sits and a cabin 6 covering the cab 5. An engine (not shown) is provided below the driving unit 5.

A grain storage box 7 for storing grains after threshing is provided at the rear of the cab 4. A grain discharging device 8 for discharging grains in the grain storage tank 7 is provided. A threshing device 9 is provided adjacent to the left side of the grain storage box 7. A supply chain 10 for gripping and conveying the harvested stalks and a rail table 11 for gripping the harvested stalks together with the supply chain 10 at a position vertically opposite to the supply chain 10 are provided on the left side of the threshing device 9. The threshing device 9 has a threshing cylinder 12, and performs threshing processing on the harvested stalks conveyed by the supply chain 10. A waste straw conveying device 13 is connected with the rear part of the threshing device 9. The waste straw conveying device 13 receives the waste straw subjected to threshing treatment from the supply chain 10 and carries out gripping conveyance to the rear. A waste straw cutting device 14 for cutting the waste straw conveyed by the waste straw conveying device 13 is provided below the waste straw conveying device 13.

[ threshing device ]

As shown in fig. 3, a threshing chamber 18 is formed at the upper part of the threshing device 9. The threshing cylinder 12 is rotatably provided in the threshing chamber 18 around a front-rear direction axial center (rotation axial center) Y1. The threshing cylinder 12 is rotatably supported by walls 21 forming the front and rear sides of the threshing chamber 18 via a cylinder shaft 20. A receiving net 22 is provided below the threshing cylinder 12. A dust discharge fan 23 for discharging dust to the outside is provided behind the threshing cylinder 12.

The threshing device 9 is provided with: a swing separator 24 for swing-separating the objects to be separated, a winnower 25 for blowing a classification air to the swing separator 24, a primary treatment recovery unit 26 for recovering grains (such as single grain) of the primary treated objects, and a secondary recovery unit 27 for recovering grains (such as grain with branch stalks) of the secondary treated objects. The primary treatment collection unit 26 includes a primary screw 28 for conveying grains of the primary treatment product to the right. A grain lifting device 29 is provided for lifting grains from the primary treated material from the primary screw device 28 toward the grain storage tank 7. The thresher 29 is coupled to the right end of the primary screw 28 in a linked manner. The secondary collection unit 27 includes a secondary screw device 30 for conveying grains of the secondary processed product to the right. A secondary reduction device 31 is provided for reducing grains of the secondary processed product from the secondary screw device 30 to the swing-type sorting device 24. The secondary reduction device 31 is coupled to the right end of the secondary screw device 30 in a linked manner.

As shown in fig. 4 to 7,

upper frames

32 and 33 extending in the front-rear direction across the front and rear portions of the threshing device 9 are provided on the left and right side portions of the upper portion of the threshing device 9, respectively. An upper lip 34 and a lower lip (not shown) are provided on the left side of the threshing device 9. A threshing mouth 35 through which harvesting stalks for threshing pass is formed between the upper lip 34 and the lower lip. A plurality of stalk cutting blades 36 are mounted on the upper portion of the upper lip 34 in a state of being aligned in the front-rear direction. A guide plate 37 for guiding the cornstalks and the like in the threshing chamber 18 is provided at the upper right side of the threshing cylinder 12. The guide plate 37 is provided in a state where its lower end portion is connected to the right upper end portion of the receiving net 22. A plurality of stalk cutting blades 38 are mounted on an upper portion of the guide plate 37 in a state of being aligned in the front-rear direction.

An upper opening 18a is formed in an upper portion of the threshing chamber 18. The upper opening 18a is formed across the front wall 21 and the rear wall 21 in the front-rear direction, and across the upper end of the upper lip 34 and the upper end of the guide plate 37 in the left-right direction. In fig. 5, 6, and the like, the left-right opening width of the upper opening 18a is denoted by W.

An openable and closable threshing chamber cover 39 covering the threshing cylinder 12 from above and an openable and closable right cover 40 located adjacent to the right side of the threshing chamber cover 39 are provided on the upper part of the threshing device 9. The left end of the threshing chamber cover 39 is swingably supported by the left upper frame 32 about a front-rear direction axial center (swing axial center) Y2. The right end portion of the right cover 40 is swingably supported by the right upper frame 33 about a front-rear direction axis (swing axis) Y3.

As shown in fig. 3 to 7, the threshing cylinder 12 includes a threshing cylinder shaft 20 extending in the front-rear direction and a substantially cylindrical main body 42 supported by the threshing cylinder shaft 20 and having a plurality of threshing teeth 41 attached to the outer peripheral portion thereof. The threshing cylinder shaft 20 is arranged across the front wall 21 and the rear wall 21. The threshing cylinder shaft 20 is rotatably supported by the front wall 21 via a front bearing 43 and rotatably supported by the rear wall 21 via a rear bearing 44. An input pulley 45 to which driving force from the engine is input is provided at a portion of the threshing cylinder shaft 20 protruding forward from the front wall 21.

[ Main body ]

As shown in fig. 6 to 10, the main body 42 includes: a front main body 46 constituting a front side portion, a rear main body 47 constituting a rear side portion, and a middle main body 48 (circumferentially split main body) constituting a portion between the front main body 46 and the rear main body 47. The main body 42 is divided into three parts, i.e., a front main body 46, a rear main body 47, and a middle main body 48. The front body 46, the rear body 47, and the middle body 48 are integrally rotatably supported by the single threshing cylinder shaft 20. That is, the main body 42 includes a plurality of (three in the present embodiment) front body portions 46, rear body portions 47, and middle body portions 48 that are configured by dividing the main body 42 back and forth (in the present embodiment, into three portions) and integrally rotating.

[ front body part ]

The front body 46 is formed of a roll-formed plate. The front body 46 has a plurality of holes for attaching the threshing teeth 41. The front body 46 is shorter in the front-rear direction than the rear body 47. A front disk 49 is fixed to the front end opening of the front body 46 by a bolt so as to close the front end opening of the front body 46. The front disk 49 has a reduced diameter portion 49a whose diameter decreases toward the front. A front boss 50 is fixed to the rear surface (inner surface of the main body 42) of the front disk 49 by a bolt 51. The front boss 50 is secured to the threshing cylinder shaft 20 by a bolt 52.

[ rear body part ]

The rear body portion 47 is formed of a roll-formed plate. A plurality of holes for mounting the threshing teeth 41 are formed in the rear body portion 47. A rear disk 53 is fixed to the rear end opening of the rear body 47 by bolts so as to close the rear end opening of the rear body 47. A rear boss 54 is fixed to the front surface (inner surface of the main body 42) of the rear disk 53 by a bolt 55. The rear boss 54 is secured to the threshing cylinder shaft 20 with a bolt 56.

[ middle body part ]

The middle body 48 is formed of a roll-formed plate. The middle body 48 has a plurality of holes for attaching the threshing teeth 41. The middle body portion 48 is longer in the front-rear direction than the front body portion 46 and the rear body portion 47. The middle body portion 48 spans, in the front-rear direction, a position corresponding to the front portion and a position corresponding to the rear portion in the front-rear existing range of the stalk cutting blade 38 on the guide plate 37 side, and spans, in the front-rear existing range of the stalk cutting blade 36 on the upper lip 34 side, a position on the front side of the front end and a position on the rear side of the front-rear existing range of the stalk cutting blade 36 on the upper lip 34 side.

The middle main body 48 is divided into four parts, i.e., two first middle main body structural plates 57 (main body structural members) and two second middle main body structural plates 58 (main body structural members) in the circumferential direction around the threshing cylinder shaft 20. That is, the middle body 48 includes a plurality of (four in the present embodiment) first middle body structural plates 57 and second middle body structural plates 58, each of which is formed by dividing the middle body 48 in the circumferential direction around the threshing cylinder shaft 20 (in the present embodiment, into four portions).

The first middle body structure plate 57 and the second middle body structure plate 58 are configured by equally dividing the middle body 48 in the circumferential direction around the threshing cylinder shaft 20 (dividing at 90 degree intervals). The first middle body structure plates 57 and the second middle body structure plates 58 are alternately arranged in the circumferential direction around the threshing cylinder shaft 20. The two first middle body structure plates 57 and the two second middle body structure plates 58 are all detachably configured.

The first middle body structural plate 57 is provided with mounting seats 59 for mounting the second middle body structural plate 58 at both edges in the circumferential direction around the threshing cylinder shaft 20. Two edges of the second middle body structural plate 58 around the threshing cylinder shaft 20 in the circumferential direction are fixed to the mounting seat 59 by bolts from the radially outer side of the main body 42. The mounting seat 59 has a plurality of bolt holes 59a for bolt fastening. A plurality of bolt holes 58a for bolt fastening are formed in both circumferential edges of the second middle body structural plate 58 around the threshing cylinder shaft 20.

[ mounting frame ]

As shown in fig. 8 to 10, a mounting frame 60 that mounts the front body portion 46, the rear body portion 47, and the middle body portion 48 is provided. The mounting frame 60 includes: a front ring 61, a rear ring 62, a plurality of (four in the present embodiment) coupling members 63 coupling the front ring 61 and the rear ring 62, a front rib 64, a rear rib 65, and a middle rib 66.

The rear end portion of the front body 46, the front end portion of the first middle body structural plate 57, and the front end portion of the second middle body structural plate 58 are detachably fixed to the front ring 61 by bolts. The front end portion of the rear body 47, the rear end portion of the first middle body structural plate 57, and the rear end portion of the second middle body structural plate 58 are detachably fixed to the rear ring 62 by bolts. In the threshing chamber 18, the front ring 61 is located at a position where the threshing load is large (at the front part of the threshing chamber 18), but in order to increase the rigidity of the front ring 61, the plate thickness of the front rib 64 is made thicker than the plate thickness of the rear rib 65.

The front rib 64 has a plurality of (four in the present embodiment) projections 64a projecting radially outward of the main body 42 from the outer peripheral surface of the front ring 61 at intervals in the circumferential direction around the threshing cylinder shaft 20. The rear rib 65 has a plurality of (four in the present embodiment) projections 65a projecting radially outward from the outer peripheral surface of the rear ring 62 toward the main body 42, with intervals in the circumferential direction around the threshing cylinder shaft 20.

[ method for assembling threshing cylinder ]

As shown in fig. 11 to 14, the threshing cylinder 12 is assembled in the order of the rear main body mounting step (see fig. 11), the front main body mounting step (see fig. 12), the first middle main body structural plate mounting step (see fig. 13), and the second middle main body structural plate mounting step (see fig. 14).

As shown in fig. 11, in the rear body portion mounting step, the rear body portion 47 is mounted to the mounting frame 60. At this time, the concave portion 47a on the rear body portion 47 side is aligned with the cutout 62a on the rear ring 62 side, and the convex portion 47b in the front end portion of the rear body portion 47 is brought into between the protruding portions 65 a.

As shown in fig. 12, in the front body portion mounting step, the front body portion 46 is mounted to the mounting frame 60. At this time, the roller joint J1 of the front main body portion 46 and the roller joint J2 of the rear main body portion 47 are aligned, and the convex portion 46a in the rear end portion of the front main body portion 46 is brought into between the protruding portions 64 a.

As shown in fig. 13, in the first intermediate body structural plate mounting step, the first intermediate body structural plate 57 is mounted to the mounting frame 60. At this time, the convex portion 57a in the rear end portion of the first middle body portion structural plate 57 is fitted into the concave portion 47a in the front end portion of the rear body portion 47.

As shown in fig. 14, in the second middle body structural plate mounting step, the second middle body structural plate 58 is mounted to the mounting frame 60. Here, the pitch of the bolt holes 58a of the edge portion (one edge portion) corresponding to one mount 59 and the pitch of the bolt holes 59a of one mount 59 in the second middle body portion structural plate 58 are different from the pitch of the bolt holes 58a of the edge portion (the other edge portion) corresponding to the other mount 59 and the pitch of the bolt holes 59a of the other mount 59 in the second middle body portion structural plate 58. Therefore, when the second middle body structural plate 58 is mounted to the mounting frame 60, it is necessary to set the orientation of the second middle body structural plate 58 in such a manner that the bolt hole 58a of one edge portion of the second middle body structural plate 58 is aligned with the bolt hole 59a of one mounting seat 59 and the bolt hole 58a of the other edge portion of the second middle body structural plate 58 is aligned with the bolt hole 59a of the other mounting seat 59.

[ method of removing the first and second Main body Structure plates ]

As shown in fig. 15 (a) to (e), all of the two first middle body structural plates 57 and the two second middle body structural plates 58 are configured to be detachable, and are configured to pass through the upper opening 18a in a state where the threshing chamber cover 39 is opened. Hereinafter, a method of removing the first middle body structural plate 57 and the second middle body structural plate 58 will be described.

First, as shown in fig. 15 (a), the threshing cylinder 12 is rotated so that one of the two second middle main body structural plates 58 faces the upper opening 18a. After the one second middle body structural plate 58 is released from the bolt fixation to the mounting frame 60, the one second middle body structural plate 58 can be detached from the upper opening 18a.

Next, as shown in fig. 15 (b), the threshing cylinder 12 is rotated so that the other second middle main body structural plate 58 of the two second middle main body structural plates 58 faces the upper opening 18a. After the other second middle body structural plate 58 is released from the bolt fixation to the mounting frame 60, the other second middle body structural plate 58 can be detached from the upper opening 18a.

Next, as shown in fig. 15 (c), the threshing cylinder 12 is rotated so that one of the two first middle body structural plates 57 faces the upper opening 18a. After the one first middle body structural plate 57 is released from the bolt fixation with respect to the mounting frame 60, the one first middle body structural plate 57 can be detached from the upper opening 18a.

Finally, as shown in fig. 15 (d), the threshing cylinder 12 is rotated so that the other one of the two first middle main body structural plates 57 faces the upper opening 18a. After the other first middle body structural plate 57 is released from the bolt fixation with respect to the mounting frame 60, the other first middle body structural plate 57 can be detached from the upper opening 18a.

In this way, the order of the manner of removing one of the second middle main body structure plates 58 (see fig. 15 (a)), the manner of removing two of the second middle main body structure plates 58 (see fig. 15 (b)), the manner of removing two of the second middle main body structure plates 58 and one of the first middle main body structure plates 57 (see fig. 15 (c)), and the manner of removing two of the second middle main body structure plates 58 and two of the first middle main body structure plates 57 (see fig. 15 (d)) can be selected.

[ other embodiments ]

(1) In the above embodiment, the two first middle body structural plates 57 and the two second middle body structural plates 58 are all configured to be detachable, and are configured to pass through the upper opening 18a in a state where the threshing chamber cover 39 is opened. However, at least one of the two first middle body structure plates 57 and the two second middle body structure plates 58 may be configured to be detachable from the first middle body structure plate 57 or the second middle body structure plate 58, and may be configured to pass through the upper opening 18a in a state where the threshing chamber cover 39 is opened.

(2) In the above embodiment, the first middle body structure plate 57 and the second middle body structure plate 58 are configured by equally dividing the middle body 48 in the circumferential direction around the threshing cylinder shaft 20. However, the first middle body structure plate 57 and the second middle body structure plate 58 may be configured to divide the middle body 48 unevenly in the circumferential direction around the threshing cylinder shaft 20.

(3) In the above embodiment, the middle body portion 48 is longer in the front-rear direction than the front body portion 46 and the rear body portion 47. However, the middle body 48 may be shorter than the front body 46 in the front-rear direction. Alternatively, the middle body 48 may be shorter in the front-rear direction than the rear body 47. Alternatively, the middle body 48 may be shorter in the front-rear direction than the front body 46 and the rear body 47.

(4) In the above embodiment, the front body 46 is shorter in the front-rear direction than the rear body 47. However, the front body 46 may be longer in the front-rear direction than the rear body 47. Alternatively, the front body 46 and the rear body 47 may have the same length in the front-rear direction.

(5) In the above embodiment, the main body 42 is divided into three parts in front and rear. However, the main body 42 may be divided into four or more parts in the front-rear direction. Alternatively, the main body 42 may be divided into two parts in front and rear.

(6) In the above embodiment, the middle body portion 48 is divided into four portions in the circumferential direction around the threshing cylinder shaft 20. However, the middle body 48 may be divided into five or more portions in the circumferential direction around the threshing cylinder shaft 20. Alternatively, the middle body portion 48 may be divided into two portions or three portions in the circumferential direction around the threshing cylinder shaft 20.

Industrial applicability

The invention can be used for threshing device of combine harvester.

Second embodiment

The mode for carrying out the invention is explained based on the drawings.

[ integral Structure of combine harvester ]

Fig. 16 and 17 show a semi-feeding combine harvester. The combine is provided with a frame 1 and a crawler travel device 2. A harvesting part 3 for harvesting the upright cornstalks is arranged in front of the travelling machine body. A cab 4 is provided at a right portion of a front portion of the traveling machine body. The cab 4 includes a cab 5 on which a driver sits and a cabin 6 covering the cab 5. An engine (not shown) is provided below the driving unit 5.

[ waste straw cutting device ]

As shown in fig. 17 and 18, the waste straw cutting device 14 is configured to be swingable around a vertical axis (swing axis) Z1 across a work position where waste straw from the waste straw conveying device 13 is received and cut and a non-work position located at a position separated from the work position. The waste straw cutting device 14 includes a cutter blade 15 for cutting waste straw, a cover 16 for covering the cutter blade 15, and a switching plate 17. In the cover 16, a feeding port 16a for feeding waste straw is formed at a portion above the cutter blade 15.

The switching plate 17 is configured to be capable of swinging up and down to open and close across an open position where the inlet 16a is opened and a closed position where the inlet 16a is closed. In a state where the switching plate 17 is opened, the waste straw conveyed by the waste straw conveying device 13 is thrown into the throwing port 16a and cut by the cutter 15. In a state where the switching plate 17 is closed, the waste straw conveyed by the waste straw conveying device 13 slides on the upper surface of the switching plate 17 to fall onto the ground.

[ threshing device ]

As shown in fig. 18, a threshing chamber 18 is formed at the upper part of the threshing device 9. A threshing chamber cover 19 is provided which constitutes the ceiling of the threshing device 9. The threshing cylinder 12 is rotatably provided in the threshing chamber 18 around a front-rear direction axial center (rotation axial center) Y1. The threshing cylinder 12 is rotatably supported by walls 21 forming the front and rear sides of the threshing chamber 18 via a cylinder shaft 20. A receiving net 22 is provided below the threshing cylinder 12. A dust discharge fan 23 for discharging dust to the outside is provided behind the threshing cylinder 12.

As shown in fig. 18 to 20, the wall 21 includes a movable wall 32 and a fixed wall 33. The threshing cylinder shaft 20 is installed across the front movable wall 32 and the rear movable wall 32. The movable wall 32 is supported by the fixed wall 33 via an arm 34 so as to be capable of swinging up and down about a front-rear direction axis (swing axis) Y2. A propeller shaft 35 for transmitting the power of the engine is provided across the front side fixed wall 33 and the rear side fixed wall 33.

Upper frames 36, 37 extending in the front-rear direction across the front and rear portions of the threshing device 9 are provided on the left and right sides of the upper portion of the threshing device 9, respectively. The left upper frame 36 is provided across the front movable wall 32 and the rear movable wall 32, and extends to a position further to the rear than the rear wall 21. The right upper frame 37 is provided across the front side fixing wall 33 and the rear side fixing wall 33, and extends to a position further to the rear side than the rear side wall 21.

A threshing cylinder frame 38 is provided which supports the threshing cylinder 12 and can swing up and down around a swing axis Y2 located on the inner side (right side) in the lateral direction of the machine body. The threshing cylinder frame 38 includes a front movable wall 32, a rear movable wall 32, and a left upper frame 36. The threshing cylinder frame 38 is configured to be capable of swinging up and down around the swinging axis Y2 so as to move up and down the lateral end (left end) of the side where the left upper frame 36 is located.

A cylinder 39 is provided for driving the threshing cylinder frame 38 to swing up and down. The cylinder 39 is provided across the rear arm 34 and the rear fixed wall 33. In the present embodiment, the cylinder block 39 is constituted by an electro-hydraulic cylinder. A gas damper 40 is provided for applying a force to the threshing cylinder frame 38 to swing upward. The gas damper 40 is provided across the rear movable wall 32 and the rear fixed wall 33.

As shown in fig. 19 to 22, a pair of front and rear threshing cylinder locking mechanisms 41 for holding the position of the threshing cylinder 12 at the threshing processing position where threshing processing is performed are provided. The front threshing cylinder locking mechanism 41 is provided across the front movable wall 32 and the front fixed wall 33. The rear threshing cylinder locking mechanism 41 is provided across the rear movable wall 32 and the rear fixed wall 33. The threshing cylinder locking mechanism 41 includes a plate 42 and a roller 43. The plate 42 is swingably supported on the movable wall 32 about a front-rear direction axis (swing axis) Y3. A hook 42a engageable with the roller 43 is formed at the front end of the plate 42. A motor (not shown) for driving the plate 42 to swing is provided. The roller 43 is supported on the fixed wall 33 via a support shaft 44. The hook 42a engages with the roller 43, and thereby the threshing cylinder 12 is held in the threshing position. By releasing the engagement of the hook 42a with the roller 43, the threshing cylinder frame 38 swings upward through the cylinder 39 and the air damper 40.

Fig. 21 and 22 show the structure around the support shaft 44 on the front side. The structure of the periphery of the rear support shaft 44 is not shown, but is the same as the structure of the periphery of the front support shaft 44. The support shaft 44 is supported by the fixed wall 33 via a support plate 45. A support plate 46 is provided for supporting the distal end portion of the support shaft 44. The support plate 46 is fixed to the fixed wall 33 with bolts. A connecting plate 47 is provided to connect the support plate 45 and the support plate 46 across them. The connecting plate 47 is configured to cover the roller 43 from above. The connecting plate 47 includes an upper inclined portion 47a inclined downward and leftward and a lower inclined portion 47b inclined downward and leftward.

According to the above-described structure, the structure for supporting the support shaft 44 can be reinforced by the coupling plate 47. In addition, the connecting plate 47 can prevent the stalk dust from acting on the roller 43. Here, if the stalk chip falls onto the connecting plate 47, it slides down along the upper inclined portion 47a and the lower inclined portion 47b. As a result, even if the stalk pieces fall onto the connecting plate 47, they are hard to accumulate in the connecting plate 47.

As shown in fig. 23 and 24, a root cover 49 is attached to the rear end portion of the rail table cover 48 covering the rail table 11 from the lateral outside (left). A mount 50 to which the root cover 49 is attached is provided at the rear end portion of the rail table cover 48. The mount 50 is provided inside the rail housing 48. The mount 50 is provided with a support shaft 51 for supporting the root cover 49. The mount 50 and the support shaft 51 do not protrude downward from the lower end of the rail housing 48.

As shown in fig. 25 to 27, a first rear upper frame 52 protruding rearward from a portion (left side portion) of the threshing device 9 on the side where the left upper frame 36 is located is provided at the rear upper portion. The first rear upper frame 52 is formed in a substantially U-shape protruding rearward in a side view. The waste straw conveyed by the waste straw conveying device 13 passes through a space at the inner side with respect to the bent portion of the first rear upper frame 52. The first rear upper frame 52 is supported via a plate 53 at the rear end of the left side wall of the threshing device 9. The first rear upper frame 52 is constituted by a plurality of tubular members (three tubes in the present embodiment) arranged side by side in the left-right direction. The first rear upper frame 52 includes a main pipe 54, a left auxiliary pipe 55 provided adjacent to the left side of the main pipe 54, and a right auxiliary pipe 56 provided adjacent to the right side of the main pipe 54. The main pipe 54, the left auxiliary pipe 55, and the right auxiliary pipe 56 are formed of round pipes. A plate 53 is fixed to the front end of the lower portion of the main pipe 54 and the front end of the lower portion of the left auxiliary pipe 55. The plate 53 is fixed to the rear end of the left side wall of the threshing device 9 by bolts.

A cross frame 57 is provided, which is coupled to the rear end portion of the right upper frame 37 and extends rightward from the rear end portion of the right upper frame 37. The right end of the cross frame 57 is supported by a support post 58 erected on the frame 1. A connecting frame 59 for connecting the upper frame 37 and the cross frame 57 is provided across the right side.

At the rear upper part of the threshing device 9, a second rear upper frame 60 is provided that spans the left and right sides in the threshing device 9. The second rear upper frame 60 is formed of a circular tube. The second rear upper frame 60 is located above the waste straw conveying device 13 and is disposed across the first rear upper frame 52 and the cross frame 57. The second rear upper frame 60 is formed in a shape to bypass the waste straw conveying device 13 in such a manner that the waste straw conveying device 13 rising together with the waste straw frame 61 does not interfere with the second rear upper frame 60. Specifically, the second rear upper frame 60 is formed in a curved shape that bulges rearward. The end portion of the second rear upper frame 60 on the side of the first rear upper frame 52 is fixed to the stay 62 fixed to the main pipe 54 with bolts, and the end portion of the second rear upper frame 60 on the side of the cross frame 57 is fixed to the stay 63 fixed to the cross frame 57 with bolts. That is, the first rear upper frame 52 is connected to the right upper frame 37 via the second rear upper frame 60 and the cross frame 57.

Here, the left upper frame 36 is connected to the main pipe 54 via a lock mechanism 112, and the second rear upper frame 60 is connected via a stay 63. The front end portion of the upper portion of the left auxiliary pipe 55 extends to a portion between a connection portion with the left upper frame 36 and a stay 62 with the second rear upper frame 60 in the main pipe 54. The right auxiliary tube 56 is provided across a portion of the main tube 54 corresponding to an inserted member 105 described later and a portion corresponding to a stay 62 connected to the second rear upper frame 60.

[ waste straw conveying device ]

As shown in fig. 25, 27 and 28, the waste straw conveying device 13 is disposed so as to be inclined such that the conveying terminal of the waste straw conveying device 13 is positioned on the right side in a plan view. The waste straw conveying device 13 includes a root conveying device 65 for gripping and conveying the root side portion of the waste straw and a spike conveying device 66 for locking and conveying the spike side portion of the waste straw. The root conveyor 65 has a root conveyor chain 67 with projections and a waste straw guide 68. The waste straw guide 68 is disposed below the root conveyor 67 so as to face the lower path portion of the root conveyor 67. The front portion of the waste straw rail 68 is supported from below by a front support member 69. The rear portion of the waste straw rail 68 is supported from below by a rear support member 70. The spike conveying device 66 includes a spike conveying chain 71 with a tip.

A belt transmission mechanism 72 for transmitting power of the transmission shaft 35 to the input shaft (not shown) of the waste straw conveyor 13 is provided across the transmission shaft 35 and the input shaft (not shown) of the waste straw conveyor 13. The belt transmission mechanism 72 includes a driving pulley 73, a driven pulley 74, a transmission belt 75, a tension arm 76, a swing tension pulley 77, and a fixed tension pulley 78. The drive pulley 73 is provided at a portion of the drive shaft 35 protruding rearward from the rear-side fixed wall 33. The driven pulley 74 is provided to the input shaft of the waste straw conveying device 13. The belt 75 is wound around the driving pulley 73 and the driven pulley 74.

The tensioning arm 76 is pivotally supported on the drive shaft 35. The tension arm 76 is biased to swing toward the tension applying side by a tension spring 76 a. A swing tension pulley 77 is rotatably supported at the front end portion of the tension arm 76. The swing tension pulley 77 contacts the upper path portion of the belt 75 from above in order to apply tension to the belt 75. The oscillating tensioner pulley 77 acts on a portion of the drive belt 75 that spans the fixed tensioner pulley 78 and the drive pulley 73.

The fixed tension pulley 78 contacts the upper path portion of the belt 75 from below in order to apply tension to the belt 75. As a result, the belt 75 is wound around the fixed tension pulley 78 from above, and therefore, the stalk pieces falling from above with respect to the fixed tension pulley 78 are less likely to accumulate on the fixed tension pulley 78. The fixed tension pulley 78 acts on a portion between the driving pulley 73 and the driven pulley 74 on the driving pulley 73 side in the transmission belt 75.

The fixed tension pulley 78 is supported on a stay 80 via a support shaft 79. The stay 80 is provided in a state of hanging down from the front end portion (front frame portion 84) of the waste straw frame 61. The support shaft 79 is detachably fixed to the stay 80 by bolts in a state protruding forward from the stay 80.

[ waste straw frame ]

As shown in fig. 26 to 31, a waste straw frame 61 supporting the waste straw conveying device 13 is provided. The waste straw conveying device 13 is suspended from the waste straw frame 61 via the front stay 81 and the rear stay 82. The waste straw frame 61 is configured to be capable of swinging up and down around a swinging shaft center Y2 located at the inner side (right side) in the machine body lateral direction. The waste straw frame 61 is constituted by a frame-like frame. The waste straw frame 61 includes a base end frame portion 83, a front frame portion 84, a rear frame portion 85, and a free end frame portion 86. The front frame portion 84, the rear frame portion 85, and the free end frame portion 86 are formed by bending a single round tube. The base end portion of the front frame portion 84 is folded rearward. The base end portion of the rear frame portion 85 is folded forward. A space is provided between the base end portion of the front frame portion 84 and the base end portion of the rear frame portion 85 in the front-rear direction. The base end frame portion 83 is provided across the base end portion of the front frame portion 84 and the base end portion of the rear frame portion 85. The base end frame portion 83 is fixed to a base end portion of the front frame portion 84 and a base end portion of the rear frame portion 85 from below. The base end frame portion 83 is formed of a square tube.

The waste straw frame 61 is supported by a pair of front and rear stays 88 via a support shaft 87 so as to be capable of swinging up and down around a swinging shaft center Y2. The support shaft 87 is supported by a stay 89 fixed to the base end frame portion 83. The front and rear pair of stays 88 are fixed to stays 90 of the upper frame 37 fixed to the right side by bolts. The waste straw frame 61 is supported on the upper frame 37 on the right side via a pair of front and rear stays 88 and 90. A connecting rod 91 connecting the front stay 88 and the rear stay 88 is provided across them.

A coupling plate 92 (coupling member) is provided to detachably couple the threshing cylinder frame 38 and the waste straw frame 61. The connecting plate 92 is provided across the body-side outer end (left end) of the threshing cylinder frame 38 and the body-side outer end (left end) of the waste straw frame 61. Specifically, the web 92 is provided across the left upper frame 36 and the free end frame portion 86.

The left end portion of the connecting plate 92 is detachably fixed to a stay 93 fixed to the left upper frame 36 by a plurality of (three in the present embodiment) bolts 94. The right end portion of the connecting plate 92 is detachably fixed to a plurality of (three in the present embodiment) stays 95 fixed to the free end frame portion 86 by a plurality of (three in the present embodiment) bolts 96. The coupling plate 92 is formed with bolt holes 92a for bolts 94 and bolt holes 92b for bolts 96. The stay 93 is constituted by a long member extending in the front-rear direction along the left upper frame 36. The stay 155 is fixed to the rear end portion of the stay 93 with bolts in a state protruding rearward from the rear end portion of the stay 93.

In this way, the waste straw frame 61 is connected to the left upper frame 36 via the connecting plate 92, and is supported by the right upper frame 37 via the front and rear pair of stays 88 and the stay 90. That is, the waste straw frame 61 is disposed across the left upper frame 36 and the right upper frame 37.

The threshing cylinder frame 38 and the waste straw frame 61 can be integrally swung up and down by the cylinder 39 in a state where the threshing cylinder frame 38 and the waste straw frame 61 are connected by the connecting plate 92. The waste straw frame 61 is configured to be capable of being lifted from a position (a lowered position, see fig. 34) where the waste straw conveying device 13 conveys the waste straw to a position where the waste straw conveying device 13 does not convey the waste straw. In the present embodiment, a first raised position (see fig. 36) and a second raised position (see fig. 35) lower than the first raised position are set as the raising limit of the waste straw frame 61. The first raised position is a position where clogging of the stalks in the threshing cylinder 12 can be removed. The second rising position is a position where clogging removal of the waste straw in the waste straw conveying device 13 is possible, and is a position where the conveying terminal portion of the waste straw conveying device 13 is not in contact with the waste straw cutting device 14.

[ threshing chamber cover ]

As shown in fig. 26 to 30, the threshing chamber cover 19 covers the threshing cylinder 12, the threshing cylinder frame 38, and the waste straw frame 61 from above. The threshing chamber cover 19 includes a left threshing chamber cover 97 and a right threshing chamber cover 98. The left threshing chamber cover 97 is configured to be capable of swinging up and down around a front-rear direction axis (swing axis) Y4 located on the lateral outer side (left side) of the machine body. The left threshing chamber cover 97 is supported on the left upper frame 36 via a support member 99. A plurality of dust-feeding valves (not shown) are provided on the rear surface of the left threshing chamber cover 97 at intervals in the front-rear direction. The right threshing chamber cover 98 is supported on the right upper frame 37 so as to be vertically swingable about a front-rear direction axial center (swing axial center) Y5 located on the inner side (right side) in the machine body lateral direction. The right threshing chamber cover 98 is provided in a state that its left end portion is inclined to the right end portion of the left threshing chamber cover 97.

As shown in fig. 32 and 33, the left threshing chamber cover 97 includes a main body 100 and an auxiliary cover 101 (cover member). The portion of the left threshing chamber cover 97 corresponding to the connecting plate 92 is constituted by an auxiliary cover 101 that is another cover member of the left threshing chamber cover 97 different from the main body 100. A cutout portion 100a is formed in a portion of the main body 100 corresponding to the auxiliary cover 101. The cutout 100a is formed in a substantially rectangular shape that is long in the front-rear direction in plan view, and opens laterally outward (leftward) of the machine body. The auxiliary cover 101 is detachably fixed to the coupling plate 92 by a plurality of (two in the present embodiment) bolts 102. The auxiliary cover 101 includes a first bending portion 101b bent downward from the right end portion of the upper surface portion 101a thereof, and a second bending portion 101c bent inward (rightward) from the lower end portion of the first bending portion 101b toward the body. The second bending portion 101c is formed with a bolt hole 101d for the bolt 102. The second bending portion 101c is formed with a notch portion 101e so as not to interfere with the bolt 96.

The auxiliary cover 101 is configured to be detachable from the coupling plate 92 in a state where the main body 100 is closed. Specifically, in a plan view, a gap S1 is formed between the main body 100 and the auxiliary cover 101 (the first bending portion 101 b) in the closed state, and as a result, the bolt 102 is positioned in the gap S1.

According to the above configuration, when the auxiliary cover 101 is attached and detached, the bolt 102 can be operated from the gap S1 between the main body 100 and the auxiliary cover 101 (the first bending portion 101 b) without opening the main body 100, and the auxiliary cover 101 can be easily attached and detached.

Further, the auxiliary cover 101 is removed, whereby the connecting plate 92 is exposed. Specifically, the three bolts 94 are exposed by removing the auxiliary cover 101. Thus, the three bolts 94 and the three bolts 96 can be operated to detach the coupling plate 92. In this way, when the connection by the connection plate 92 is released, the main body 100 does not need to be opened, and the auxiliary cover 101 is only required to be detached, so that the connection releasing operation can be easily performed.

[ positioning mechanism ]

As shown in fig. 27 to 30, a positioning mechanism 103 is provided for positioning the front-rear position of the waste straw frame 61 in a state where the waste straw frame 61 is located at the lowered position. The positioning mechanism 103 is constituted across the waste straw frame 61 and the first rear upper frame 52. The positioning mechanism 103 includes a positioning plate 104 and an inserted member 105 into which the positioning plate 104 is inserted. The positioning plate 104 is fixed to a stay 106 of the free end frame portion 86 fixed to the waste straw frame 61 by bolts. The inserted member 105 is secured to the main tube 54 in the first rear upper frame 52. The positioning plate 104 and the inserted member 105 do not protrude downward from the lower end of the upper portion of the first rear upper frame 52 in a state where the positioning plate 104 is inserted into the inserted member 105 (a state where the waste straw frame 61 is positioned at the lowered position).

According to the above-described structure, as the waste straw frame 61 swings downward, the positioning plate 104 is inserted into the inserted member 105 from above. By inserting the positioning plate 104 into the inserted member 105 in this way, the front-rear position of the waste straw frame 61 is positioned so that the waste straw frame 61 is not displaced in the front-rear direction in a state where the waste straw frame 61 is positioned at the lowered position.

[ locking mechanism for waste straw frame ]

As shown in fig. 26 to 31, a lock mechanism 107 is provided, and in a state where the waste straw frame 61 is located at the lowered position, the lock mechanism 107 holds the position of the base end side portion of the waste straw frame 61 at the upper frame 37 on the right side. The lock mechanism 107 includes: a pin 108 provided on the upper frame 37 on the right side, and a hook 109 provided on the waste straw frame 61 and engageable with the pin 108. The pin 108 is supported on the upper right frame 37 via a stay 110. The hook 109 is supported by the base end frame portion 83 via a stay 111.

As shown in fig. 28, as the waste straw frame 61 swings downward, the hooks 109 engage with the pins 108. By engaging the hook 109 with the pin 108 in this way, the position of the base end side portion of the waste straw frame 61 is held by the lock mechanism 107 on the right side of the upper frame 37.

Further, as shown in fig. 29, as the waste straw frame 61 swings upward, the hooks 109 come off from the pins 108. By releasing the hook 109 from the pin 108 in this way, the position of the upper frame 37 on the right side of the base end side portion of the waste straw frame 61 by the lock mechanism 107 is maintained.

[ locking mechanism for threshing cylinder frame ]

As shown in fig. 26 to 30, 34 and 35, a lock mechanism 112 is provided, and in a state where the threshing cylinder frame 38 is located at the lowered position, the lock mechanism 112 holds the position of the left upper frame 36 to the first rear upper frame 52. The lock mechanism 112 includes: a roller 113 provided on the first rear upper frame 52, and a hook 114 provided on the left upper frame 36 and engageable with the roller 113.

The roller 113 is supported rotatably about a front-rear axis on a stay 115 fixed to the main pipe 54. The roller 113 does not protrude downward from the lower end of the upper portion of the first rear upper frame 52.

The hook 114 is swingably supported on the support shaft 116 about a front-rear direction axis (swing axis) Y6. The hook 114 includes: a roller portion 114a rotatable about the swing axis Y6, and a hook portion 114b fixed to an outer peripheral portion of the roller portion 114a so as to rotate integrally with the roller portion 114 a. The support shaft 116 is provided in a state protruding rearward from the rear end portion of the left upper frame 36. The rear end of the support shaft 116 is supported by the stay 155.

An interlocking mechanism 117 is provided to interlock the locking mechanism 112 (hook 114) with the rear threshing cylinder locking mechanism 41 (rear plate 42). The interlocking mechanism 117 includes: a rod 118 extending in the front-rear direction, a front connecting arm 119 connecting the rear plate 42 and the rod 118 in a linked manner, and a rear connecting arm 120 connecting the rod 118 and the hook 114 in a linked manner. The lever 118 is rotatably supported on the left upper frame 36 via a stay or the like around its axial center (axial center in the front-rear direction). The rear end of the rod 118 is supported by the stay 155. A front stay 121 is provided at the front end of the rod 118. A front connecting arm 119 is provided across the front stay 121 and the rear plate 42. A rear stay 122 is provided at the rear end of the lever 118. A rear link arm 120 is provided across the rear stay 122 and the hook 114 b.

As shown in fig. 28 and 34, when the rear plate 42 swings around the swing axis Y3 toward the engagement side to engage the rear hook portion 42a with the rear roller 43, the swing of the rear plate 42 toward the engagement side is transmitted to the hook 114 by the interlocking mechanism 117, and the hook 114 engages with the roller 113. By engaging the hooks 114 with the rollers 113 in this manner, the position of the left upper frame 36 is held by the lock mechanism 112 in the first rear upper frame 52 in a state where the threshing cylinder frame 38 is located at the lowered position.

In this way, in a state where the waste straw frame 61 is located at the lowered position, the left upper frame 36 is coupled to the first rear upper frame 52 via the lock mechanism 112. That is, in a state where the waste straw frame 61 is located at the lowered position, the first rear upper frame 52 is coupled to the right upper frame 37 via the left upper frame 36 and the waste straw frame 61.

As shown in fig. 29 and 35, when the rear plate 42 swings around the swing axis Y3 to the engagement release side to disengage the rear hook portion 42a from the rear roller 43, the swing of the rear plate 42 to the engagement release side is transmitted to the hook 114 by the interlocking mechanism 117, and the hook 114 is disengaged from the roller 113. By releasing the hook 114 from the roller 113 in this way, the left upper frame 36 held in position by the lock mechanism 112 is released to the first rear upper frame 52.

[ swinging Structure of waste straw cutting device ]

As shown in fig. 37, the waste straw cutting device 14 is supported by a column 124 erected on the frame 1 via a pair of upper and lower support shafts 123 so as to be swingable about a swing axis Z1. The upper frame 125 supporting the upper support shaft 123 and the lower frame 125 supporting the lower support shaft 123 are provided on the stay 124 so as to protrude rearward from the stay 124. A frame 126 is provided on the right side of the waste straw cutter device 14 so as to extend in the vertical direction. A plate 127 is fixed to an upper portion of the frame 126 so as to swing integrally with the frame 126 around a swing axis Z1. The plate 127 is rotatably supported by the upper support shaft 123. A lower stay 128 is provided at a right side portion of the waste straw cutting device 14 at a lower portion thereof. The lower stay 128 is rotatably supported by the lower support shaft 123. An angle sensor 129 is provided for detecting the swing angle of the waste straw cutter 14 around the swing axis Z1. The angle sensor 129 is constituted by a potentiometer.

[ locking mechanism for waste straw cutting device ]

As shown in fig. 37 to 40, a lock mechanism 130 is provided, and the lock mechanism 130 restricts the swing of the waste straw cutting device 14 from the working position to the non-working position side and the swing of the waste straw cutting device 14 from the non-working position to the working position side. The lock mechanism 130 is configured to be switchable between a non-restricting state in which the swing of the waste straw cutting device 14 is not restricted and a restricting state in which the swing of the waste straw cutting device 14 is restricted. The lock mechanism 130 includes a plate 127 and a cam 131.

The cam 131 is supported by the support shaft 132 so as to be swingable about a left-right direction shaft center (swing shaft center) X1. The support shaft 132 is provided on the upper frame 125 in a state protruding leftward from the upper frame 125. The cam 131 is prevented from falling off by the bolt 133 and the flat washer 134 in a state of being externally fitted to the support shaft 132.

A torsion spring 135 is provided to urge the cam 131 to swing toward the initial position side. A stopper 136 is provided that abuts in a state where the cam 131 is located at the initial position. The torsion spring 135 is engaged with the cam 131 at one end portion thereof and with the stopper 136 at the other end portion thereof in a state of being externally fitted to the support shaft 132. The cam 131 is biased to the initial position side by the torsion spring 135 to swing and abuts against the stopper 136, and the position of the cam 131 is maintained at the initial position.

As shown in fig. 31 and 34 to 36, an interlocking mechanism 137 is provided to interlock the restricting operation of the locking mechanism 130 with the raising operation of the waste straw frame 61 so that the locking mechanism 130 restricts the swing of the waste straw cutting device 14 in conjunction with the raising operation of the waste straw frame 61. The interlocking mechanism 137 includes: an arm 138 capable of swinging separately from the waste straw frame 61 about a swinging axis Y2, an operating pin 139 (operating member) that presses the arm 138 so as to swing integrally with the waste straw frame 61, and a cable 140 (connecting member) that connects the arm 138 and the lock mechanism 130.

The arm 138 is supported at the rear end portion of the support shaft 87 via a bush 141 so as to be swingable about a swing axis Y2 separately from the waste straw frame 61. The arm 138 includes: the action pin 139 presses the acted portion 138a and the connection portion 138b connected to the cable 140. The operating pin 139 is provided at the rear end portion of the stay 89 in a state protruding rearward from the rear end portion of the stay 89.

A cable 140 is disposed across the arm 138 and cam 131. The cable 140 includes an inner cable 140a and an outer cable 140b. The end of the inner cable 140a on the arm 138 side is connected to the connecting portion 138b. The end of the outer cable 140b on the arm 138 side is supported by the stay 142. The stay 142 is fixed to the stay 88 on the rear side by bolts. A positioning pin 143 (positioning member) that positions the arm 138 at the initial position is provided. The positioning pin 143 is supported by the stay 142.

As shown in fig. 38, the cam 131 side end of the inner cable 140a is connected to the cam 131. The coupling shaft 131a to which the inner cable 140a is coupled is provided to the cam 131 in a state protruding leftward from the cam 131. The cam 131 side end of the outer cable 140b is supported by the stay 144. The stay 144 is fixed to the upper frame 125.

As shown in fig. 34 and 35, the position of the cam 131 is maintained at the initial position in a state where the waste straw frame 61 is located in a range of the lower position or more and the second upper position or less. In this state, as shown in fig. 40, the cam 131 is positioned lower than the lower surface of the plate 127 within the rotation locus of the front end 127a of the plate 127. Therefore, even if the plate 127 rotates around the swing axis Z1, the swing of the waste straw cutting device 14 is not restricted because it does not contact the cam 131. Thus, as shown in fig. 42 to 44, in a state in which the waste straw frame 61 is located in a range of the lower position or more and the second raised position or less, the lock mechanism 130 is in the non-restricting state, and therefore, the waste straw cutting device 14 can be switched to the working position and the non-working position.

Here, as shown in fig. 34 and 35, when the waste straw frame 61 is lifted from the lowered position, the operating pin 139 swings upward integrally with the waste straw frame 61. However, if the rising position of the waste straw frame 61 is equal to or lower than the reference position (second rising position), the action pin 139 does not press the arm 138 (the acted portion 138 a). Therefore, the arm 138 does not pull the cable 140 in a state where the waste straw frame 61 is located in a range above the lowered position and below the second raised position.

As shown in fig. 36, when the waste straw frame 61 is lifted from the second lifting position to the first lifting position, the arm 138 (the acted portion 138 a) is pushed by the acting pin 139, and the cable 140 is pulled by the arm 138. That is, when the rising position of the waste straw frame 61 exceeds the reference position (second rising position), the action pin 139 presses the arm 138. Thereby, the cam 131 swings upward against the urging force of the torsion spring 135 to the position shown in fig. 36 so as to be pulled by the cable 140.

In this state, as shown in fig. 41, the cam 131 enters the upper side than the lower surface of the plate 127 within the rotation locus of the front end 127a of the plate 127. Therefore, when the plate 127 rotates around the swing axis Z1, the cam 131 abuts against the plate, and therefore the swing of the waste straw cutter 14 is restricted. Thus, the arm 138 (the acted portion 138 a) is pressed by the acting pin 139, and the arm 138 pulls the cable 140, so that the swing of the waste straw cutter 14 is restricted by the lock mechanism 130 in conjunction with the rising of the waste straw frame 61. As described above, as shown in fig. 42 and 45, in the state where the waste straw frame 61 is located at the first raised position, the lock mechanism 130 is in the restricted state, and therefore, the waste straw cutting device 14 cannot be switched to the working position and the non-working position.

As shown in fig. 46, when the lock mechanism 130 is switched to the restricting state in a state where the waste straw cutting device 14 is located at the working position, the waste straw cutting device 14 cannot be switched from the working position to the non-working position.

Specifically, as shown in fig. 47, when the locking mechanism 130 is in the restricted state and the waste straw cutting device 14 is swung from the working position to the non-working position, the first contact surface 127b of the plate 127 contacts the cam 131 at the stage of swinging the plate 127 from the working position to the first locking position by the first allowable angle θ1. By abutting the first abutment surface 127b of the plate 127 against the cam 131 in this way, the waste straw cutting device 14 is prevented from swinging further toward the non-working position side.

As shown in fig. 48, when the lock mechanism 130 is switched to the restricting state in a state where the waste straw cutting device 14 is located at the non-operating position, the waste straw cutting device 14 cannot be switched from the non-operating position to the operating position.

Specifically, as shown in fig. 49, when the locking mechanism 130 is in the restricted state and the waste straw cutting device 14 is swung from the non-operating position to the operating position, the second contact surface 127c of the plate 127 contacts the cam 131 at the stage of swinging the plate 127 from the non-operating position to the second locking position by the second allowable angle θ2. By abutting the second abutment surface 127c of the plate 127 against the cam 131 in this way, the waste straw cutting device 14 is prevented from swinging further toward the working position side.

In this way, as shown in fig. 50, the lock mechanism 130 allows the waste straw cutting device 14 to swing from the working position to the non-working position side by a certain angle range (first allowable angle θ1) and allows the waste straw cutting device 14 to swing from the non-working position to the working position side by a certain angle range (second allowable angle θ2) in the restricted state. The second allowable angle θ2 is set to an angle larger than the first allowable angle θ1.

[ waste straw receiving hood ]

As shown in fig. 18, 51 and 52, a waste straw receiving hood 145 for receiving waste straw is provided below the waste straw conveying device 13. The waste straw receiving hood 145 is provided across the threshing device 9 and the waste straw cutting device 14. The waste straw receiving cover 145 includes: a first cover 146 constituting a front side portion of the waste straw receiving cover 145, and a second cover 147 constituting a rear side portion of the waste straw receiving cover 145.

The first cover 146 is supported by the threshing device 9 (specifically, the dust exhaust fan 23). The first cover 146 includes a front cover portion 148, a left rear cover portion 149, and a right rear cover portion 150. A gap S2 into which the rear support member 70 enters is provided between the left rear cover portion 149 and the right rear cover portion 150 so as not to interfere with the rear support member 70. The second cover 147 is supported by the waste straw cutter 14. The second cover 147 is located at a lower elevation than the first cover 146.

In the waste straw receiving hood 145, the dividing portions D of the first hood 146 and the second hood 147 are located at a height position lower than the apex T. The dividing portion D of the first cover 146 and the second cover 147 is located at a height position lower than the height position of the lower end of the conveying terminal portion of the waste straw conveying device 13 located at the second rising position so that the conveying terminal portion of the waste straw conveying device 13 located at the second rising position is not in contact.

[ switch board ]

As shown in fig. 27, 53 and 54, a cutout 17a into which the conveying terminal of the waste straw cutter device 14 enters is formed in the switching plate 17 so as not to prevent the switching plate 17 from being blocked from opening and closing by the contact of the switching plate 17 with the conveying terminal of the waste straw conveyor device 13 when the switching plate 17 is opened and closed in a state in which the waste straw frame 61 is raised. A cover 151 is provided on the switching plate 17, and the cover 151 covers the cutout 17a in a state in which the conveyance end portion of the waste straw conveyance device 13 is allowed to enter the cutout 17a. The mounting member 152 of the mounting cover 151 is fixed to the switching plate 17 by bolts 153. The outer peripheral edge portion of the cover 151 is fixed to the inner peripheral edge portion 152a of the mounting member 152 by bolts 154. The mounting member 152 is formed with a reinforcing rib 152b.

The cover 151 is formed of an elastically deformable member. In the present embodiment, the cover 151 is made of, for example, a rubber-like elastic body (polyurethane elastic body). A slit 151a extending in the width direction of the switching plate 17 (the direction orthogonal to the swing axis of the switching plate 17) is formed in the cover 151. The inner peripheral edge 152a of the attachment member 152 is formed in a shape inclined downward toward the front end so that both edge portions along the slit 151a in the cover 151 decrease toward the slit 151a side in a state where the cover 151 is attached to the attachment member 152 (see fig. 54). Thus, in a state where the switching plate 17 is closed, the waste straw sliding over the upper surface of the switching plate 17 is less likely to be caught in the slit 151a.

Here, as the waste straw frame 61 swings upward, the height position of the conveying terminal portion of the waste straw conveying device 13 decreases. In the present embodiment, when the switching plate 17 is opened and closed in a state where the waste straw frame 61 is raised, the conveying terminal portion of the waste straw conveying device 13 enters the notch portion 17a through the slit 151a. At this time, if the conveying terminal portion of the waste straw conveying device 13 is in contact with the cap 151, the cap 151 is elastically deformed to allow the conveying terminal portion of the waste straw conveying device 13 to enter the cutout portion 17a. Thereafter, when the conveying terminal portion of the waste straw conveying device 13 is separated from the hood 151, the hood 151 is restored to the original shape.

[ other embodiments ]

(1) In the above embodiment, the first rear upper frame 52 is coupled to the right upper frame 37 via the second rear upper frame 60 and the cross frame 57. However, the first rear upper frame 52 may be coupled to the right upper frame 37 via the second rear upper frame 60 instead of the cross frame 57. That is, the right end portion of the second rear upper frame 60 may be coupled (e.g., bolted) to the rear end portion of the right upper frame 37.

(2) In the above embodiment, the first rear upper frame 52 is constituted by a plurality of tubular members (three pipes in the above embodiment) arranged side by side in the left-right direction. However, the first rear upper frame 52 may be constituted by a plurality of tubular members arranged side by side in the up-down direction. The number of the tubular members is not limited to three.

(3) In the above embodiment, the gap S1 is formed between the main body 100 and the auxiliary cover 101 in the closed state in a plan view, and the bolt 102 for detachably fixing the auxiliary cover 101 to the coupling plate 92 is positioned in the gap S1. However, the structure for enabling the auxiliary cover 101 to be attached to and detached from the coupling plate 92 in a state where the main body 100 is closed is not limited to the structure of the above embodiment. For example, the bolt 102 may be covered with the main body 100 from above, and a hole for inserting a tool for bolt operation may be formed in a portion of the main body 100 corresponding to the bolt 102 (a portion overlapping the bolt 102 in a plan view) so that the bolt 102 can be operated in a state where the main body 100 is closed.

(4) In the above embodiment, the connection member is constituted by the cable 140, but the connection member may be constituted by a lever, an arm, or the like, for example.

Industrial applicability

The present invention may be used with a combine (e.g., a semi-fed combine).

Third embodiment

The mode for carrying out the invention is explained based on the drawings.

[ integral Structure of combine harvester ]

Fig. 55 and 56 show a semi-feeding combine harvester. The combine is provided with a frame 1 and a crawler travel device 2. A harvesting part 3 for harvesting the upright cornstalks is arranged in front of the travelling machine body. A cab 4 is provided at a right portion of a front portion of the traveling machine body. The cab 4 includes a cab 5 on which a driver sits and a cabin 6 covering the cab 5. An engine (not shown) is provided below the driving unit 5.

[ threshing device ]

As shown in fig. 57, a threshing chamber 18 is formed at the upper part of the threshing device 9. A threshing chamber cover 19 is provided which constitutes the ceiling of the threshing device 9. The threshing cylinder 12 is rotatably provided in the threshing chamber 18 around a front-rear direction axial center (rotation axial center) Y1. The threshing cylinder 12 is rotatably supported by walls 21 forming the front and rear sides of the threshing chamber 18 via a cylinder shaft 20. A receiving net 22 is provided below the threshing cylinder 12. A dust discharge fan 23 for discharging dust to the outside is provided behind the threshing cylinder 12.

As shown in fig. 57 to 59, the wall 21 includes a movable wall 32 and a fixed wall 33. The threshing cylinder shaft 20 is installed across the front movable wall 32 and the rear movable wall 32. The movable wall 32 is supported by the fixed wall 33 via an arm 34 so as to be capable of swinging up and down about a front-rear direction axis (swing axis) Y2. A propeller shaft 35 for transmitting the power of the engine is provided across the front side fixed wall 33 and the rear side fixed wall 33.

A pair of threshing cylinder locking mechanisms 67 are provided in front and rear to hold the position of the threshing cylinder 12 at the threshing position where threshing is performed. The front threshing cylinder locking mechanism 67 is provided across the front movable wall 32 and the front fixed wall 33. The rear threshing cylinder locking mechanism 67 is provided across the rear movable wall 32 and the rear fixed wall 33. The threshing cylinder locking mechanism 67 includes a plate 68 and a roller 69. The plate 68 is swingably supported on the movable wall 32 about a front-rear direction axis (swing axis) Y3. A hook 68a engageable with the roller 69 is formed at the front end of the plate 68. A motor (not shown) for driving the plate 68 to swing is provided. The roller 69 is supported on the fixed wall 33 via a support shaft 70. The hook 68a engages with the roller 69, and thereby the threshing cylinder 12 is held in the threshing position. By releasing the engagement of the hook 68a with the roller 69, the threshing cylinder frame 38 swings upward through the cylinder 39 and the air damper 40.

Here, a waste straw frame (not shown) is provided that supports the waste straw conveyor 13 and is capable of swinging up and down around the swinging shaft center Y2. In the present embodiment, the threshing cylinder frame 38 and the waste straw frame are connected to each other so as to be able to be decoupled from each other, and the threshing cylinder frame 38 and the waste straw frame are configured to be able to swing up and down integrally by the cylinder 39 in a state where the threshing cylinder frame 38 and the waste straw frame are connected to each other.

[ threshing cylinder ]

As shown in fig. 57, the threshing cylinder 12 includes: a threshing cylinder shaft 20 extending in the front-rear direction, and a substantially cylindrical main body 42 supported by the threshing cylinder shaft 20 and having a plurality of threshing teeth 41 attached to the outer peripheral portion thereof. The threshing cylinder shaft 20 is arranged across the front wall 21 and the rear wall 21. The threshing cylinder shaft 20 is rotatably supported by the front wall 21 via a front bearing 43 and rotatably supported by the rear wall 21 via a rear bearing 44. An input pulley 45 to which driving force from the engine is input is provided at a portion of the threshing cylinder shaft 20 protruding forward from the front wall 21.

As shown in fig. 60 to 62, the main body 42 includes: a front main body 46 constituting a front side portion, a rear main body 47 constituting a rear side portion, and a middle main body 48 constituting a portion between the front main body 46 and the rear main body 47. The main body 42 is divided into three parts, i.e., a front main body 46, a rear main body 47, and a middle main body 48. The front body 46, the rear body 47, and the middle body 48 are integrally rotatably supported by the single threshing cylinder shaft 20. That is, the main body 42 includes a plurality of (three in the present embodiment) front body portions 46, rear body portions 47, and middle body portions 48 that are configured by dividing the main body 42 back and forth (in the present embodiment, into three portions) and integrally rotating.

The middle body 48 is formed of a roll-formed plate. The middle body 48 has a plurality of holes for attaching the threshing teeth 41. The middle body portion 48 is longer in the front-rear direction than the front body portion 46 and the rear body portion 47. The middle main body 48 is divided into four parts, i.e., two first middle main body structural plates 57 (main body structural members) and two second middle main body structural plates 58 (main body structural members) in the circumferential direction around the threshing cylinder shaft 20. That is, the middle body 48 includes a plurality of (four in the present embodiment) first middle body structural plates 57 and second middle body structural plates 58, each of which is formed by dividing the middle body 48 in the circumferential direction around the threshing cylinder shaft 20 (in the present embodiment, into four portions).

A mounting frame 60 is provided to which the front body portion 46, the rear body portion 47, and the middle body portion 48 are mounted. The mounting frame 60 includes: a front ring 61, a rear ring 62, a plurality of (four in the present embodiment) coupling members 63 coupling the front ring 61 and the rear ring 62, a front rib 64, a rear rib 65, and a middle rib 66.

[ threshing chamber cover ]

As shown in fig. 56, 58 and 59, the threshing chamber cover 19 covers the threshing cylinder 12, the threshing cylinder frame 38 and the waste straw frame from above. The threshing chamber cover 19 includes a left threshing chamber cover 71 and a right threshing chamber cover 72. The left threshing chamber cover 71 and the right threshing chamber cover 72 extend to a position on the rear side of the rear end of the threshing cylinder 12. The left threshing chamber cover 71 is configured to be capable of swinging up and down around a front-rear direction axis (swing axis) Y4 located on the lateral outer side (left side) of the machine body. The left threshing chamber cover 71 is supported by the left upper frame 36 via a support member 73. A plate 74 is attached to the rear surface of the left threshing chamber cover 71. A plurality of dust feed valves 75 are mounted on the plate 74 at intervals in the front-rear direction.

The right threshing chamber cover 72 is supported on the upper frame 37 on the right side so as to be vertically swingable about a front-rear direction axial center (swing axial center) Y5 located on the inner side (right side) in the machine body widthwise direction. The right threshing chamber cover 72 is provided in a state that its left end portion goes over the right end portion of the left threshing chamber cover 71.

[ gas damper ]

A gas damper 76 (holding mechanism) is provided to hold the left threshing chamber cover 71 in an open state. The air damper 76 is configured to support the rear portion of the left threshing chamber cover 71. The gas damper 76 is provided across the rear and rear movable wall 32 of the left threshing chamber cover 71. The end of the gas damper 76 on the left threshing chamber cover 71 side is connected to a connection portion 77. The connection portion 77 is provided in the rib 71a (or in the vicinity of the rib 71 a) in the left threshing chamber cover 71. The end of the gas damper 76 on the rear movable wall 32 side is connected to a connection portion 78. The coupling portion 78 is provided at an upper portion of the rear movable wall 32.

As shown in fig. 63, in a state where the threshing cylinder frame 38 is located at the raised position, the left threshing chamber cover 71 can be kept in a state of being opened by the gas damper 76. In fig. 63, the right threshing chamber cover 72 is detached.

Here, in order to bring the threshing cylinder frame 38 into the state shown in fig. 63, it is preferable to raise the threshing cylinder frame 38 after opening the left threshing chamber cover 71. In the order of returning from the state shown in fig. 63 to the original state (see fig. 58), it is preferable that the left threshing chamber cover 71 is closed after the threshing cylinder frame 38 is lowered.

According to the above configuration, the left threshing chamber cover 71 is kept open by the air damper 76 in a state where the threshing cylinder frame 38 is located at the raised position, and maintenance of the threshing cylinder 12 can be performed on the threshing device 9 from both directions (left side portion and upper portion of the threshing device 9). Further, by detaching the middle body portion 48 (the first middle body portion structure plate 57 and the second middle body portion structure plate 58), the hand can be inserted into the main body 42 from the opening of the main body 42 at the portion from which the middle body portion 48 is detached, and maintenance of the threshing cylinder 12 (for example, replacement of the threshing teeth 41 or the like) can be easily performed.

[ other embodiments ]

(1) In the example shown in fig. 64, the left threshing chamber cover 71 swings to a position beyond the fulcrum (swing axis Y4) and abuts against the frame or the like, and is held in an open state. Further, by detaching the right side plate 9a of the threshing device 9, maintenance of the threshing cylinder 12 can be performed on the threshing device 9 from two directions (right side portion and upper portion of the threshing device 9).

(2) In the above embodiment and the other embodiment (1), a lock mechanism 79 may be provided to hold the right threshing chamber cover 72 in an open state. As shown in fig. 65 and 66, the lock mechanism 79 is provided across the front end portion and the front wall 21 of the right threshing chamber cover 72. The lock mechanism 79 includes a lever 80 and a receiving member 81. The lever 80 is swingably supported by the stay 82 about a front-rear direction axis (swing axis) Y6. The stay 82 is provided at an upper portion of the front-side fixing wall 33. The stay 82 has a cutout 82a into which the swing front end portion of the lever 80 fits. By fitting the swing front end portion of the lever 80 to the cutout 82a, the lever 80 is held in the storage position.

The receiving member 81 is provided on the rear surface of the right threshing chamber cover 72.

Holes

81a and 81b into which the swing distal end portions of the lever 80 are inserted are formed in the receiving member 81. The

holes

81a and 81b are arranged along the width direction of the right threshing chamber cover 72.

According to the above-described structure, as shown in the upper diagram of fig. 66, the right threshing chamber cover 72 is kept in a small open state by fitting the swing front end portion of the lever 80 into the hole 81b on the side away from the swing axis Y5 among the

holes

81a, 81b. In this case, the right threshing chamber cover 72 does not interfere with the grain storage box 7. As shown in the lower diagram of fig. 66, the right threshing chamber cover 72 is held in a state of being opened widely by inserting the swing front end portion of the lever 80 into the hole 81a on the side closer to the swing axis Y5 of the

holes

81a, 81b. In this case, if the grain storage tank 7 is opened laterally outward of the machine body, the right threshing chamber cover 72 does not interfere with the grain storage tank 7. In this way, by keeping the right threshing chamber cover 72 in the open state by the lock mechanism 79, it is not necessary to support the right threshing chamber cover 72 in the open state by hand at the time of maintenance inside the threshing device 9, and maintenance inside the threshing device 9 can be easily performed.

(3) In the above embodiment, the gas damper 76 is configured to support the rear portion of the left threshing chamber cover 71. However, the gas damper 76 may be configured to support the front portion of the left threshing chamber cover 71. Alternatively, a gas damper 76 supporting the rear portion of the left threshing chamber cover 71 may be provided in addition to the gas damper supporting the front portion of the left threshing chamber cover 71. In the case where a gas damper supporting the front portion of the left threshing chamber cover 71 is provided, the gas damper may be provided so as to extend across the front portion of the threshing chamber cover 71 and the front wall (front wall 21, specifically, front movable wall 32) of the threshing chamber 18.

(4) In the above embodiment, the holding mechanism is constituted by the gas damper 76. However, the holding mechanism is not limited to the gas damper 76. For example, the holding mechanism may be constituted by a lock mechanism.

(5) In the above embodiment, all of the two first middle body structural plates 57 and the two second middle body structural plates 58 are configured to be detachable. However, at least one of the two first middle body structure plates 57 and the two second middle body structure plates 58 may be configured to be detachable from the first middle body structure plate 57 or the second middle body structure plate 58.

(7) In the above embodiment, the main body 42 is divided into three parts in front and rear. However, the main body 42 may be divided into four or more parts in the front-rear direction. Alternatively, the main body 42 may be divided into two parts in front and rear. Alternatively, the threshing cylinder 42 may not be divided back and forth.

Industrial applicability

The invention can be used for threshing device of combine harvester.

Claims

1. A threshing device is provided with:

a threshing cylinder arranged in the threshing chamber; and

a threshing chamber cover capable of opening and closing and covering the threshing cylinder from the upper side,

the threshing cylinder is provided with a threshing cylinder shaft extending along the front-back direction and a main body which is supported on the threshing cylinder shaft and is provided with a plurality of threshing teeth at the periphery,

the main body is provided with a plurality of main body parts which are formed by dividing the main body back and forth and integrally rotate,

at least one of the plurality of main body parts is a circumferentially divided main body part having a plurality of main body part structural members formed by dividing the main body part in a circumferential direction around the threshing cylinder shaft,

At least one of the plurality of main body structural members is configured to be detachable and configured to pass through an upper opening of the threshing chamber in a state where the threshing chamber cover is opened,

the plurality of main body structural members are all configured to be detachable, and are all configured to pass through the upper opening in a state where the threshing chamber cover is opened,

the main body structural member has the same number of the first main body structural member and the second main body structural member,

the first main body structural members and the second main body structural members are alternately arranged in the circumferential direction,

mounting seats for mounting the second main body structural member are respectively arranged at two edges of the first main body structural member in the circumferential direction,

two edges of the second main body structural member in the circumferential direction are fixed to the mount from the outside in the radial direction of the main body, respectively.

2. Threshing device as claimed in claim 1, wherein,

the plurality of main body structural members are configured by equally dividing the main body in the circumferential direction.

3. Threshing device according to claim 1 or 2, wherein,

The main body is divided into three main body parts in front and back,

at two adjacent positions in front and rear of the circumferentially divided main body portion, there are other main body portions respectively,

the circumferentially split main body portion is longer in the front-rear direction than the main body portion at two front-rear adjacent positions of the circumferentially split main body portion.

4. A threshing device as claimed in claim 3, wherein,

the body portion of the front adjacent portion of the circumferentially divided body portion is shorter in the front-rear direction than the body portion of the rear adjacent portion of the circumferentially divided body portion.