CN108207287B

CN108207287B - Combine harvester

Info

Publication number: CN108207287B
Application number: CN201711381663.2A
Authority: CN
Inventors: 梅林竜司
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2016-12-22
Filing date: 2017-12-20
Publication date: 2022-06-07
Anticipated expiration: 2037-12-20
Also published as: CN108207287A; KR102557624B1; KR20180073463A

Abstract

The invention provides a combine harvester which can reasonably form respective swing supporting structures of an upper cover and a straw conveying device. A combine harvester is provided with: an upper frame (40) which supports the upper cover (38) and can swing up and down around a transmission shaft (34) extending in the front-rear direction of the machine body; and a frame-shaped straw frame (50) which supports the front part and the rear part of the straw conveying device and can swing up and down between a descending position where the straw conveying device conveys straws and a rising position where the straw conveying device does not convey straws by taking a supporting shaft (70) extending along the front and rear directions of the machine body as a center. The support shaft (70) and the drive shaft (34) are different shafts.

Description

Combine harvester

Technical Field

The present invention relates to a combine harvester, which comprises: the conveying chain is used for clamping and conveying the cut rice straws; a threshing device for threshing the cut grain stalks conveyed by the conveying chain through a threshing cylinder; and the straw conveying device is connected with the rear side of the threshing device, receives the threshed straws from the conveying chain and clamps and conveys the straws to the rear side.

Background

As the above-described combine harvester, for example, a combine harvester described in patent document 1 is known. The combine harvester described in patent document 1 includes: a conveyor chain (a "threshing conveyor chain" フィードチェン in the literature) for holding and conveying the harvested straw; a threshing device (in the literature, "threshing apparatus") for threshing the harvested straws transported by the transport chain by a threshing cylinder (in the literature, "harvesting cylinder"); a straw conveying device (a straw conveying device) connected to the rear side of the threshing device, for receiving the straw after the threshing process from the conveying chain and holding and conveying the straw to the rear side. An upper cover (in the document, "dispensing body カバー (threshing cylinder cover)") is provided above the threshing cylinder to cover the threshing cylinder from above. The upper cover swings to open and close by taking one side of the threshing chamber as a fulcrum. The straw conveying device is opened and closed in a manner of swinging up and down by taking a rotating shaft in the front-back direction as a fulcrum. According to this configuration, the upper cover and the straw conveying device are opened by swinging the upper cover and the straw conveying device upward, respectively, so that maintenance work can be easily performed.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication No. 2012-50339

Disclosure of Invention

Technical problem to be solved by the invention

Patent document 1 discloses only swinging opening and closing of the upper cover and the straw conveying device, and there is room for improvement in appropriately configuring the swing support structures of the upper cover and the straw conveying device.

In view of the above circumstances, there is a strong demand for a combine harvester in which the swing support structures of the upper cover and the straw conveying device can be reasonably configured.

In the combine harvester described in patent document 1, when the straw conveying device is opened, there is a risk that the straw conveying device interferes with the rear upper cover that covers the straw conveying device from the rear upper side, and there is room for improvement in terms of opening the straw conveying device widely.

In view of the above, there is an urgent need for a combine harvester that can open the straw conveying device to a large extent.

Means for solving the technical problem

The present invention provides a combine harvester, which comprises:

the conveying chain is used for clamping, conveying and cutting the grain stalks;

a threshing device for threshing the cut and taken rice straws conveyed by the conveying chain through a threshing cylinder;

a straw conveying device which is connected with the rear side of the threshing device, receives the threshed straws from the conveying chain and clamps and conveys the straws to the rear side;

the combine is characterized by comprising:

an upper cover that covers the threshing cylinder from above;

an upper frame which supports the upper cover and can swing up and down around a first support shaft extending in the front-rear direction of the machine body;

a frame-shaped straw frame which supports the front part and the rear part of the straw conveying device and can swing up and down between a descending position where the straw conveying device conveys straws and a rising position where the straw conveying device does not convey straws by taking a second supporting shaft extending along the front and rear directions of the machine body as a center;

the second support shaft and the first support shaft are different shafts.

According to this characteristic configuration, since the upper frame is supported by the first support shaft and the straw frame is supported by the second support shaft, the respective swing support structures of the upper cover and the straw conveyor can be configured appropriately, taking into consideration the characteristics (for example, weight, balance, etc.) of the respective components of the upper cover and the straw conveyor.

Further, in the present invention, it is preferable that,

the second support shaft is supported by a support bracket that supports the first support shaft.

The support frame is a member having high rigidity that supports a large-sized upper cover covering the threshing cylinder from above. This characteristic structure enables the straw frame to be firmly supported by the support frame having high rigidity via the second support shaft.

Further, in the present invention, it is preferable that,

the first support shaft and the second support shaft are disposed on the same axis,

the upper frame and the straw frame can swing integrally.

According to this characteristic structure, the upper cover and the straw conveyor can be easily opened by swinging the upper frame and the straw frame integrally upward.

Further, in the present invention, it is preferable that,

the combine harvester is provided with a connecting mechanism which can be used for connecting the upper frame and the straw frame in a releasable way.

According to this characteristic structure, the upper frame and the straw frame can be integrally swung upward in a connected state in which the upper frame and the straw frame are connected by the connecting mechanism. Thus, the upper cover and the straw conveying device can be easily opened. In addition, in the connection released state in which the connection state is released, the upper frame and the straw frame can be swung upward. Thus, only the straw conveying device can be opened when the maintenance operation of the straw conveying device is performed, and only the upper cover can be opened when the maintenance operation of the threshing cylinder is performed.

Further, in the present invention, it is preferable that,

the connecting mechanism can connect the part of the front part of the straw rack, which is positioned outside the machine body in the left-right direction of the machine body, with the upper rack.

According to this characteristic structure, a portion of the front portion of the straw frame, which is outside the machine body in the left-right direction of the machine body, is adjacent to the upper frame in the front-rear direction of the machine body, and is adjacent to the outside of the machine body in the left-right direction of the machine body. Accordingly, since the portions of the upper frame and the straw frame that are coupled to each other are close to each other, the coupling mechanism can be configured to have a compact structure with a short coupling distance. In addition, the connection mechanism is easily accessed from the outside of the body when performing the connection operation or the connection releasing operation.

Further, in the present invention, it is preferable that,

the combine harvester is provided with a rear frame arranged at the rear upper part of the machine body,

the upper frame is provided with a front and rear direction frame which is positioned outside the machine body in the left and right direction of the machine body and extends in the front and rear direction of the machine body,

the front and rear frames extend to a rear side of the rear end of the threshing cylinder and are detachably connected to the rear frame.

According to this characteristic structure, the front-rear direction frame and the rear frame are connected to integrate the upper frame and the rear frame, thereby constituting a structure having high rigidity. Further, by releasing the connection between the front-rear direction frame and the rear frame, the upward swing of the upper frame is not hindered.

Further, in the present invention, it is preferable that,

the straw conveying device is arranged in an inclined state that the more rear side is positioned at the left and right central sides of the machine body,

the straw conveying space of the straw conveying device is formed to cross the straw rack in the front-back direction of the machine body, and is expanded in a mode that the straw conveying space is positioned at the left-right center side of the machine body along the downstream side in the conveying direction in the front-back middle part of the straw conveying space in a plan view,

the second support shaft is disposed further to the front side than the front-rear middle portion.

According to this feature, the straw conveying device is disposed in an inclined state in which the straw is positioned further toward the center of the left and right sides of the machine body, and therefore, the straw can easily fall from the rear of the machine body to a field (a harvested field) within the left and right width of the machine body. Further, a wide straw conveying space is secured to the extent of spanning the straw rack in the front-rear direction of the machine body, and the straw conveying space is enlarged to be located on the left-right center side of the machine body on the downstream side in the conveying direction from the front-rear middle portion toward the downstream side in the conveying direction. Accordingly, the straw conveyed by the straw conveying device arranged in the inclined state does not interfere with a member (for example, a side wall) forming the straw conveying space, and the straw can be conveyed well. Further, since the second support shaft is not positioned further rearward than the front-rear middle portion, the second support shaft does not obstruct the conveyance of straw in a space (a space enlarged so as to be positioned further toward the left and right center sides of the machine body toward the downstream side in the conveyance direction) positioned further rearward than the front-rear middle portion in the straw conveyance space.

Further, in the present invention, it is preferable that,

a support bracket that supports the first support shaft extends to a more rear side than the second support shaft,

the straw frame is provided with: a base end frame which is arranged on the base end side of the straw frame and extends in the front-rear direction of the machine body; a front frame coupled to a front portion of the base end frame and extending from the second support shaft side toward an outer side of the body in a left-right direction of the body; a rear frame coupled to a rear portion of the base end frame and extending from the second support shaft side toward an outer side of the body in a left-right direction of the body;

a portion on the front side of the base end frame is supported by the second support shaft,

the combine harvester is provided with a locking mechanism which keeps the position of the rear part of the base end frame on the supporting frame along with the swinging of the straw frame to the descending position side.

The support frame is a member having high rigidity that supports a large-sized upper cover covering the threshing cylinder from above. According to this characteristic configuration, the portion on the front side of the base end frame can be supported by the second support shaft, and the portion on the rear side of the base end frame can be firmly held by the support frame having high rigidity by the lock mechanism in the state where the straw frame is located at the lowered position. Further, since the locking mechanism performs position holding as the straw rack swings to the descending position side, the operator does not have to waste time and labor to operate the locking mechanism.

Further, in the present invention, it is preferable that,

the straw conveying device can be detached from the straw rack.

According to this characteristic structure, the straw rack can be swung with a small force by detaching the straw conveying device as a heavy object from the straw rack. In addition, maintenance work of the part between the straw rack and the straw conveying device can be easily performed.

The present invention provides a combine harvester, which comprises:

the conveying chain is used for clamping and conveying the cut rice straws;

the combine is characterized by comprising:

a straw rack which supports the straw conveying device and can swing up and down around a swing axis extending in the front-rear direction of the machine body between a descending position where the straw conveying device conveys straws and an ascending position where the straw conveying device does not convey straws;

a rear upper cover covering the straw conveying device from the rear upper side;

an upper portion of the rear upper cover located above the rear portion of the straw conveying device is vertically swingable between a closed position closing a straw conveying space of the straw conveying device and an open position opening the straw conveying space around a support shaft extending in a left-right direction of the machine body on a rear side of the upper portion,

the combine harvester is provided with a linkage mechanism which enables the upper part and the straw frame to swing towards the rising position side in a linkage mode to swing towards the opening position side.

According to this characteristic structure, the upper portion of the rear upper cover is swung to the open position side in linkage with the swing of the straw rack to the raised position side by the link mechanism, so that the straw conveying device does not interfere with the rear upper cover when the straw conveying device is opened. Therefore, the straw conveying device can be opened greatly.

Further, in the present invention, it is preferable that,

the rear upper cover includes a main body having a cutout portion,

the upper portion is disposed within the cutout portion.

According to this feature, the cut-out portion is formed only in the portion of the rear upper cover where there is a risk of interference with the straw conveying device, and the upper portion is provided in the cut-out portion, whereby the upper portion as a member that swings up and down can be prevented from being unnecessarily large.

Further, in the present invention, it is preferable that,

the linkage mechanism is provided with an arm extending from the straw rack to a lower part of the upper part,

the arm pushes up the upper portion in linkage with the swing of the straw rack to the side of the rising position.

According to this characteristic configuration, since the arm is a simple mechanism for pushing up the upper portion in conjunction with the swing of the straw rack toward the raised position, the upper portion can be reliably linked with the straw rack.

Further, in the present invention, it is preferable that,

a roller capable of contacting the upper portion from below is provided at a front end portion of the arm.

According to this characteristic structure, the upper portion can be smoothly pushed up by rotating the roller.

Further, in the present invention, it is preferable that,

the combine harvester is provided with a blocking part for blocking the upper part from swinging to a position lower than the closing position.

According to this feature, the upper portion does not swing to a position lower than the closed position and intrude into the straw conveying space.

Further, in the present invention, it is preferable that,

the combine harvester is provided with a force application component which applies force to the upper part to enable the upper part to swing towards the closing position side.

According to this characteristic configuration, the position of the upper portion can be held at the closed position by applying the biasing force of the biasing member to the upper portion in a state where the prevention portion prevents the upper portion from swinging to a position lower than the closed position.

Drawings

Fig. 1 is a left side view showing a half-feed type combine harvester according to a first embodiment.

Fig. 2 is a plan view showing a semi-feeding type combine harvester according to the first embodiment.

Fig. 3 is a left side view showing the threshing device according to the first embodiment.

Fig. 4 is a rear view of the threshing device according to the first embodiment in a state in which the upper frame is lowered.

Fig. 5 is a rear view of the threshing device according to the first embodiment in which the upper frame is lifted.

Fig. 6 is a plan view showing the rear part of the threshing device and the straw conveying device according to the first embodiment.

Fig. 7 is a left side view showing the rear portion of the threshing device and the straw conveyor in a state where the upper frame and the straw frame are lowered according to the first embodiment.

Fig. 8 is a rear view showing a structure behind the threshing device in a state where the upper frame and the straw frame are lowered according to the first embodiment.

Fig. 9 is a rear view showing a structure of the threshing device in a back side state in which the upper frame and the straw frame are lifted in the first embodiment.

Fig. 10 is a rear view of the straw conveyor in the first embodiment, showing a state in which the upper frame and the straw frame are lowered.

Fig. 11 is a rear view of the straw conveyor in the first embodiment, showing the upper frame and the straw frame in a raised state.

Fig. 12 is an exploded perspective view showing the structure of the base end side of the straw holder according to the first embodiment.

FIG. 13 is a left side view showing the structure of the base end side of the straw holder according to the first embodiment.

FIG. 14 is an exploded perspective view showing an upper frame, a straw frame, and a rear frame according to the first embodiment.

Fig. 15 is a rear sectional view showing the coupling mechanism according to the first embodiment.

Fig. 16 is a rear cross-sectional view of the inside lock mechanism showing the engaged state of the first embodiment.

Fig. 17 is a rear cross-sectional view of the inside lock mechanism showing the engagement released state in the first embodiment.

Fig. 18 is a rear cross-sectional view of the outer lock mechanism showing the engaged state of the first embodiment.

Fig. 19 is a rear cross-sectional view of the outside lock mechanism showing the engagement released state in the first embodiment.

Fig. 20 is a diagram illustrating the elevation operation part according to the first embodiment.

Fig. 21 is a left side view showing the rear part of the threshing device and the straw conveyor in a state where the upper frame and the straw frame are lifted in the first embodiment.

Fig. 22 is a left side view of the rear portion of the threshing device and the straw conveyor in a state where the upper frame is raised and the straw frame is lowered according to the first embodiment.

Fig. 23 is a left side sectional view showing the rear upper cover of the first embodiment.

Fig. 24 is a perspective view showing the rear upper cover of the first embodiment.

Fig. 25 is a view showing the respective rising limit heights and swing angles of the upper frame and the straw frame according to the first embodiment.

Fig. 26 is a diagram showing an upper frame and a straw frame lifting mechanism according to a first alternative example of the first embodiment.

Fig. 27 is a view showing a state where the upper frame and the straw frame are raised to the same height limit in the first another example of the first embodiment.

Fig. 28 is a view showing a state where the upper frame and the straw frame are raised to different raising limit heights in the first alternative example of the first embodiment.

Fig. 29 is a diagram showing an upper frame and a straw frame lifting mechanism according to a second alternative example of the first embodiment.

Fig. 30 is a view showing a state where the upper frame and the straw frame are raised to the same raising limit height in a second another example of the first embodiment.

Fig. 31 is a view showing a state in which the upper frame and the straw frame are raised to different raising limit heights in a second other example of the first embodiment.

Fig. 32 is a rear cross-sectional view of the outside lock mechanism of another embodiment showing an engaged state.

Fig. 33 is a rear cross-sectional view of an outside lock mechanism according to another embodiment, showing an engagement released state.

FIG. 34 is a perspective view showing another embodiment of a straw rack.

Fig. 35 is a left side view showing a self-threshing type semi-feeding type combine harvester according to the second embodiment.

Fig. 36 is a plan view showing a self-threshing semi-feeding type combine harvester according to the second embodiment.

Fig. 37 is a left side view showing a threshing device according to a second embodiment.

Fig. 38 is a rear view of the threshing device according to the second embodiment in a state in which the upper frame is lowered.

Fig. 39 is a rear view of the threshing device according to the second embodiment in which the upper frame is lifted.

Fig. 40 is a plan view showing the rear part of the threshing device and the straw conveying device according to the second embodiment.

Fig. 41 is a left side view showing the rear part of the threshing device and the straw conveyor in a state where the upper frame and the straw frame are lowered according to the second embodiment.

Fig. 42 is a rear view showing a structure behind the threshing device in a state in which the upper frame and the straw frame are lowered according to the second embodiment.

Fig. 43 is a rear view showing a structure of the threshing device in a back side state in which the upper frame and the straw frame are lifted in the second embodiment.

Fig. 44 is a rear view of the straw conveying apparatus in a state in which the upper frame and the straw frame are lowered according to the second embodiment.

Fig. 45 is a rear view of the straw conveying apparatus in the second embodiment, showing the upper frame and the straw frame in a raised state.

FIG. 46 is an exploded perspective view showing the structure of the base end side of the straw holder according to the second embodiment.

FIG. 47 is a left side view showing the structure of the base end side of the straw holder according to the second embodiment.

Fig. 48 is an exploded perspective view showing an upper frame, a straw frame, and a rear frame according to a second embodiment.

Fig. 49 is a rear sectional view showing the coupling mechanism according to the second embodiment.

Fig. 50 is a rear cross-sectional view of the inside lock mechanism showing the engaged state of the second embodiment.

Fig. 51 is a rear cross-sectional view of the inside lock mechanism showing the engagement released state in the second embodiment.

Fig. 52 is a rear cross-sectional view of the outside lock mechanism showing the engaged state of the second embodiment.

Fig. 53 is a rear cross-sectional view of the outside lock mechanism showing the engagement released state in the second embodiment.

Fig. 54 is a diagram showing a lift operation unit according to the second embodiment.

Fig. 55 is a left side view showing the rear part of the threshing device and the straw conveyor in a state where the upper frame and the straw frame are lifted in the second embodiment.

Fig. 56 is a left side view of the rear portion of the threshing device and the straw conveyor in a state where the upper frame is raised and the straw frame is lowered according to the second embodiment.

Fig. 57 is a left side sectional view showing a rear upper cover of the second embodiment.

Fig. 58 is a perspective view showing a rear upper cover of the second embodiment.

Fig. 59 is a view showing the respective rising limit heights and swing angles of the upper frame and the straw frame according to the second embodiment.

Fig. 60 is a diagram showing an upper frame and a straw frame lifting mechanism according to a first alternative example of the second embodiment.

Fig. 61 is a view showing a state in which the upper frame and the straw frame are raised to the same raising limit height in the first another example of the second embodiment.

Fig. 62 is a view showing a state in which the upper frame and the straw frame are raised to different raising limit heights in the first alternative example of the second embodiment.

FIG. 63 is a diagram showing an elevating mechanism for an upper frame and a straw frame in a second alternative example of the second embodiment.

Fig. 64 is a view showing a state where the upper frame and the straw frame are raised to the same raising limit height in a second another example of the second embodiment.

Fig. 65 is a view showing a state in which the upper frame and the straw frame are raised to different raising limit heights in a second other example of the second embodiment.

Fig. 66 is a rear cross-sectional view showing an engagement state of the outer lock mechanism according to another embodiment.

Fig. 67 is a rear cross-sectional view showing an engagement released state of the outer lock mechanism according to another embodiment.

FIG. 68 is a perspective view showing another embodiment of a straw rack.

Description of the reference numerals

< first embodiment >

9 conveying chain

10 threshing device

11 threshing cylinder

12 straw conveying device

34 drive shaft (first support shaft)

36L front and back orientation rack

36R front and back orientation rack (support rack)

37 rear frame

38 upper cover

40 upper frame

50 straw rack

66 base end frame

67 front frame

68 rear frame

70 support axle (second support axle)

87 connecting mechanism

92 inner side locking mechanism (locking mechanism)

S straw conveying space

Y2 swing axle center (axle center)

< second embodiment >

9' conveying chain

10' threshing device

11' threshing cylinder

12' straw conveying device

50' straw rack

116' rear upper cover

117' body part

117 a' cut-out portion

118' upper part

119' support shaft

120' linkage mechanism

121' arm

122' roller

127' spring (force applying component)

129' stopping part

Y2' swing axle center

Detailed Description

< first embodiment >

[ integral structure of combine harvester ]

A semi-feeding combine harvester is shown in fig. 1 and 2. The combine harvester comprises a machine frame 1 and a running device 2 for supporting the machine frame 1. A cab 3 is provided on the right side of the front of the body. The cab 3 includes a cab 4 on which a driver rides and a booth 5 covering the cab 4. An engine (not shown) is provided below the driver section 4.

A harvesting unit 6 for harvesting crops in a field is provided in front of the cab 3. A grain storage tank 7 for storing grains is provided behind the cab 3. A grain discharging device 8 for discharging grains in the grain storage tank 7 is provided. The left side of the machine body is provided with a conveying chain 9 for clamping and conveying the cut rice straws. A threshing device 10 is arranged at the left side of the grain storage box 7. The threshing device 10 threshes the cut grain stalks conveyed by the conveying chain 9 through a threshing cylinder 11. A straw conveying device 12 is connected and arranged at the rear side of the threshing device 10. The straw conveying device 12 receives the threshed straws from the conveying chain 9 and clamps and conveys the threshed straws to the rear.

[ Harvest portion ]

The harvesting section 6 is configured to a multi-row harvesting format (e.g., a six-row harvesting format). The harvesting section 6 is provided with a plurality of (e.g. seven) dividing members 13, a plurality of (e.g. six) grain lifting devices 14, a cutting device 15 and a conveying device 16. The seedling separating piece 13 is used for separating the crops in the field. The grain lifting device 14 lifts up the crop to be separated. The cutting device 15 cuts the crop being raised. The conveying device 16 conveys the harvested crop toward the threshing device 10 rearward.

[ threshing device, etc. ]

As shown in fig. 3, a threshing chamber 17 is formed in an upper portion of the threshing device 10. A threshing cylinder 11 is provided in the threshing chamber 17. The threshing cylinder 11 is rotatable about a rotation axis Y1 extending in the front-rear direction of the machine body. A screen 18 is provided below the threshing cylinder 11. A dust exhaust fan 19 for discharging dust to the outside is provided behind the threshing chamber 17.

The lower part of the thresher 10 is provided with a swing cleaning device 20 for conveying a cleaning target object rearward of the machine body while performing screening, a cleaning fan 21 for blowing cleaning air to the swing cleaning device 20, a primary recovery unit 22 for recovering grains (e.g., grains) of a primary processed object, and a secondary recovery unit 23 for recovering grains (e.g., grains with branches) of a secondary processed object.

The primary recovery unit 22 is provided with a primary auger 24 for feeding grains of the primary treatment product to the right. A longitudinal grain feeder 25 for feeding grains of the primary processed matter longitudinally to the grain storage tank 7 is linked to the right end of the primary screw 24.

The secondary recovery unit 23 is provided with a secondary auger 26 for feeding grains of the secondary treatment product to the right. A secondary returning device 27 for returning grains of secondary processed material to the swinging cleaning device 20 is linked to the right end of the secondary auger 26.

Below the rear part of the straw conveyor 12, a straw cutting device 28 is provided that cuts the straw conveyed by the straw conveyor 12. A cover 29 is provided which covers the straw cutting means 28. A switching plate 29a is provided in a portion of the cover 29 above the straw cutting device 28. The switching plate 29a can be opened and closed by swinging between a cutting position on the rising side and a non-cutting position on the falling side about a swinging axis extending in the left-right direction of the machine body. In a state where the switching plate 29a is opened (a state of the cutting position), the straw conveyed by the straw conveying device 12 is thrown into the straw cutting device 28. In a state where the switch plate 29a is closed (a state of the non-cutting position), the straw conveyed by the straw conveying device 12 slides over the upper surface of the switch plate 29a and falls to the ground.

As shown in fig. 3 to 7, wall portions 30 are provided at the front end and the rear end of the threshing chamber 17, respectively. The front wall 30 constitutes a front wall of the threshing chamber 17. The rear wall 30 constitutes a rear wall of the threshing chamber 17. The wall portion 30 includes a movable wall 31 and a fixed wall 32. The threshing cylinder 11 is rotatably supported by the movable wall 31 via a threshing cylinder shaft 11 a. A connecting arm 33 for connecting the movable wall 31 and the fixed wall 32 is provided across the two walls. The movable wall 31 is supported by the fixed wall 32 via the connecting arm 33 so as to be swingable up and down about a swing axis Y2 extending in the front-rear direction of the machine body. A transmission shaft 34 that transmits power of the engine is provided across the front-side fixed wall 32 and the rear-side fixed wall 32.

In the threshing device 10, the right side portion is constituted by the right side wall 35. The right side wall 35 extends to the rear end of the body. The right side wall 35 includes an inclined portion 35 a. The inclined portion 35a is inclined so as to be located more rearward than the rear wall portion 30 and more toward the center of the left and right sides of the machine body.

Front and rear facing frames 36L and 36R extending in the front and rear direction of the body are provided on both left and right sides of the threshing device 10. The left front-rear direction frame 36L extends to the rear side of the rear end of the threshing cylinder 11. The left front-rear direction frame 36L is formed of a square pipe having a substantially square cross-sectional shape. The right forward-backward facing frame 36R extends to the rear side of the rear end of the threshing cylinder 11. The right front-rear facing frame 36R supports the front fixing wall 32, the rear fixing wall 32, and the right side wall 35. The right front-rear direction frame 36R is formed of a square tube having a substantially rectangular cross-sectional shape (a substantially rectangular shape that is long in the lateral direction).

[ rear frame ]

A rear frame 37 is provided at the rear upper part of the body. The rear frame 37 is located outside the body in the threshing device 10 in the left-right direction of the body. The rear frame 37 is formed in a substantially U-shape protruding rearward from the rear of the threshing device 10 when viewed from the side. The rear frame 37 is formed of a circular tube.

[ Upper cover ]

An upper cover 38 is provided to cover the threshing cylinder 11 from above. The upper cover 38 extends above the rear of the straw conveyor 12 at a position further to the rear than the rear end of the threshing cylinder 11. A right upper cover 39 is provided adjacent to the right side of the upper cover 38. The right upper cover 39 extends to above the rear of the straw conveyor 12 at a position further to the rear side than the rear end of the threshing cylinder 11. The right upper cover 39 is supported by the right forward/backward facing frame 36R so as to be vertically swingable around a swing axis extending in the forward/backward direction of the machine body.

[ Upper frame ]

The upper housing 38 is supported by an upper frame 40. The upper frame 40 can swing up and down about the transmission shaft 34 extending in the front-rear direction of the machine body. The upper frame 40 is supported by the front wall 30 and the rear wall 30 via the transmission shaft 34 so as to be vertically swingable about a swing axis Y2. The upper frame 40 includes a pair of front and rear movable walls 31 and a left front and rear frame 36L. The left front-rear direction frame 36L is located outside the machine body in the machine body left-right direction in the upper frame 40.

A hydraulic cylinder 41 for swinging the upper frame 40 upward is provided. The hydraulic cylinder 41 is provided across the rear movable wall 31 and the rear fixed wall 32. The hydraulic cylinder 41 is constituted by a double-acting hydraulic cylinder, for example. However, the hydraulic cylinder 41 may be a single-acting hydraulic cylinder.

[ locking mechanism of threshing cylinder ]

The threshing cylinder 11 is swingable upward together with the upper frame 40 by a hydraulic cylinder 41. A threshing cylinder locking mechanism 42 is provided for holding the position of the threshing cylinder 11 at a threshing position for performing threshing. The threshing cylinder locking mechanism 42 includes a pair of front and rear hook plates 43 and a pair of front and rear threshing cylinder hook pins 44. The hook plate 43 is supported by the front wall 30 and the rear wall 30 so as to be swingable in the front-rear direction of the machine body about a swing axis Y3. A hook 43a engageable with the threshing cylinder hook pin 44 is provided at the front end of the hook plate 43. The hook 43a is engaged with the threshing cylinder hook pin 44, whereby the position of the threshing cylinder 11 is held at the threshing processing position. By releasing the engagement of the hook 43a with the threshing cylinder hook pin 44, the threshing cylinder 11 is swung upward together with the upper frame 40 by the hydraulic cylinder 41. A motor M for driving the front and rear pair of hook plates 43 to swing is supported on the rear surface of the rear wall portion 30. The pair of front and rear hook plates 43 are swung to the engagement side and the disengagement side by the motor M.

[ straw conveying device ]

As shown in fig. 6 and 7, the straw conveying device 12 is disposed in an inclined state in which it is positioned more toward the center of the left and right of the machine body as it goes toward the rear. The straw conveying device 12 includes a stem root conveying device 45 for pinching and conveying the stem root side of the straw and an ear tip conveying device 46 for catching and conveying the ear tip side of the straw. The stalk root conveyor 45 includes a stalk chain 47 having a protrusion 47a and a stalk guide 48. The straw guide 48 is disposed below the straw chain 47 in a state facing the lower path of the straw chain 47. The ear tip conveyor 46 is provided with a straw ear tip chain 49 having elastic teeth 49 a.

The straw conveying device 12 is supported on the straw rack 50. The straw conveying device 12 is detachable from the straw rack 50. The straw conveying device 12 is suspended and supported on the straw rack 50 via a front bracket 51 and a rear bracket 52. The straw conveying device 12 is detachably fixed to the front bracket 51 by bolts. The straw conveying device 12 is detachably fixed to the rear bracket 52 by bolts.

The straw conveying space S of the straw conveying device 12 is formed behind the wall portion 30 on the rear side. The straw conveying space S is formed across the straw rack 50 in the front-rear direction of the body. The straw conveying space S is enlarged so as to be located at the left and right center sides of the machine body toward the downstream side in the conveying direction at a front and rear middle portion (a portion corresponding to the front end of the inclined portion 35 a) of the straw conveying space S in plan view.

[ with transmission mechanism ]

As shown in fig. 6, 8 and 9, a belt transmission mechanism 53 for transmitting the power of the transmission shaft 34 to the straw conveyance device 12 is provided across the transmission shaft 34 and the straw conveyance device 12. The belt transmission mechanism 53 includes a drive pulley 54, a driven pulley 55, and a transmission belt 56. The drive pulley 54 is fixed to a portion of the transmission shaft 34 projecting rearward from the rear fixed wall 32. The driven pulley 55 is fixed to an input shaft (not shown) of the straw conveying device 12. The transmission belt 56 is wound around the drive pulley 54 and the driven pulley 55.

[ tension clutch mechanism ]

A tension clutch mechanism 57 is provided for switching the belt transmission mechanism 53 between a transmission state for transmitting power to the straw conveying device 12 and a disconnection state for disconnecting the power transmission to the straw conveying device 12. The tension clutch mechanism 57 includes a first tension arm 58, a first tension roller 59, a second tension arm 60, a second tension roller 61, and a tension spring 62. The first tensioning arm 58 is rotatably supported to the drive shaft 34. A first tension roller 59 is rotatably supported at a front end portion of the first tension arm 58. The first tension roller 59 contacts a portion of the belt 56 corresponding to the lower side path from above. A mounting portion 63 to which the tension spring 62 is mounted is provided at a base end portion of the first tension arm 58.

The second tensioning arm 60 is fixed to the first tensioning arm 58 so as to be rotatable integrally with the first tensioning arm 58. A second tension roller 61 is rotatably supported at the distal end of the second tension arm 60. The second tension roller 61 contacts a portion of the belt 56 corresponding to the upper side path from above.

The tension spring 62 biases the first tension arm 58 and the second tension arm 60 so that the first tension arm 58 and the second tension arm 60 swing about the swing axis Y2 in the tension applying direction. The end of the tension spring 62 opposite the mounting portion 63 is mounted to a rod 64. The rod 64 is supported to the bracket 65 in a position-adjustable manner. The bracket 65 is fixed (e.g., welded) to the straw frame 50 (front frame 67). By adjusting the position of the lever 64 relative to the bracket 65, the force of the tension spring 62 is varied.

[ straw rack ]

As shown in fig. 6 to 11, the straw rack 50 supports the front and rear of the straw conveying device 12 via a front bracket 51 and a rear bracket 52. The straw frame 50 is formed in a frame shape. The straw rack 50 includes a base end frame 66, a front frame 67, a rear frame 68, and a free end frame 69. A circular tube is bent to form a front frame 67, a rear frame 68, and a free end frame 69. The front of the straw conveyor 12 is supported by a free end frame 69 via a front bracket 51. The rear portion of the straw conveying device 12 is supported by the left and right center side portions of the machine body in the rear frame 68 via the rear bracket 52.

The straw rack 50 can swing up and down around a swing axis Y2 between a descending position where the straw conveying device 12 conveys straw and an ascending position where the straw conveying device 12 does not convey straw. The straw frame 50 can swing up and down around a support shaft 70 extending in the front-rear direction of the machine body. A pair of front and rear gas dampers 71 for swinging the straw rack 50 upward are provided. The gas damper 71 is disposed across the straw rack 50 (front rack 67) and the lower rack 72. An upper bracket 73 to which the gas damper 71 is coupled is fixed (e.g., welded) to the front bracket 67.

As shown in fig. 12 to 14, the base end frame 66 is provided on the base end side of the straw frame 50 and extends in the front-rear direction of the machine body. The base end frame 66 includes a front side frame portion 74 constituting the front portion side, a rear side frame portion 75 constituting the rear portion side, and a connecting frame portion 76 extending across the front side frame portion 74 and the rear side frame portion 75. The front portion of the base end frame 66 (front side frame portion 74) is supported by the support shaft 70 via a pair of front and rear brackets 77.

A stepped portion 66a recessed downward is formed in the base end frame 66 at a portion corresponding to the coupling frame portion 76. The connecting frame portion 76 includes a groove plate 78 and a connecting plate 79 that open downward. A channel plate 78 is provided across the lower surface of the front side frame portion 74 and the lower surface of the rear side frame portion 75. Inside the groove plate 78, a connecting plate 79 is provided across the left and right side walls of the groove plate 78 to connect the two.

The front frame 67 is coupled to the front end of the base end frame 66 and extends from the support shaft 70 side toward the outside of the body in the left-right direction of the body. The rear frame 68 is coupled to a rear end portion of the base end frame 66 and extends from the support shaft 70 side toward the outside of the machine body in the machine body lateral direction.

The free end frame 69 is provided on the free end side of the straw frame 50 and extends in the body front-rear direction. The free end frame 69 is coupled to an end portion of the front frame 67 on the outside of the machine body in the left-right direction of the machine body and an end portion of the rear frame 68 on the outside of the machine body in the left-right direction of the machine body. The free end frame 69 extends along the left front-rear oriented frame 36L at the lowered position, and is adjacent to the left front-rear oriented frame 36L in a state of being located at a right side adjacent position of the left front-rear oriented frame 36L.

The support shaft 70 and the transmission shaft 34 are separate shafts, and the support shaft 70 is supported by the right forward-rearward facing frame 36R, and the right forward-rearward facing frame 36R supports the transmission shaft 34. The transmission shaft 34 and the support shaft 70 are disposed on the same axis (swing axis Y2). The support shaft 70 is disposed further forward than the middle of the straw conveying space S (a portion corresponding to the front end of the inclined portion 35 a). The right front-rear oriented frame 36R extends to the rear side of the support shaft 70. The support shaft 70 is supported by a bracket 81 via a pair of front and rear brackets 80. Bracket 81 is suspended from the lower surface of forward and backward facing frame 36R on the right side. The bracket 80 is fixed to the bracket 81 with bolts. The lower bracket 72 is supported on the bracket 80 on the front side.

[ positioning mechanism ]

As shown in fig. 14, a positioning mechanism 82 is provided for positioning the free end side (free end frame 69) of the straw holder 50 at the rear frame 37 in a state where the straw holder 50 is at the lowered position so that the straw holder 50 is not positionally displaced (is not positionally displaced in the machine body front-rear direction or the like). The positioning mechanism 82 includes a claw portion 83 and an inserted portion 84 into which the claw portion 83 is inserted. The claw portion 83 is supported by the free end frame 69 via a bracket 85. The claw portion 83 is detachably fixed to the bracket 85 by a bolt 86. The inserted portion 84 is fixed (e.g., welded) to the rear frame 37. By inserting the claw portion 83 into the inserted portion 84, the free end side (free end frame 69) of the straw holder 50 is positioned on the rear frame 37 in a state where the straw holder 50 is at the lowered position, so that the straw holder 50 is not positionally displaced (is not positionally displaced in the machine body front-rear direction or the like).

[ connecting mechanism ]

As shown in fig. 14 and 15, a coupling mechanism 87 is provided for detachably coupling the upper frame 40 (left front-rear frame 36L) and the straw frame 50 (free end frame 69). The coupling mechanism 87 couples the left front-rear frame 36L and the end portion (free end frame 69) of the straw frame 50 that is outside the machine body in the left-right direction of the machine body. The coupling mechanism 87 is provided across the upper portion of the left front-rear direction frame 36L and the upper portion of the free end frame 69. The coupling mechanism 87 includes an upper side fixing bracket 88, a straw side fixing bracket 89, and a coupling bracket 90. The upper side fixing bracket 88 is fixed (e.g., welded) to the left front-rear facing frame 36L. The straw side mounting bracket 89 is fixed (e.g., welded) to the front of the free end frame 69. The connecting bracket 90 is disposed across the upper surface of the upper side fixing bracket 88 and the upper surface of the straw side fixing bracket 89. The coupling bracket 90 is detachably coupled to the upper fixing bracket 88 and the straw fixing bracket 89 by bolts 91. That is, the coupling mechanism 87 can be decoupled from the left front-rear direction frame 36L and the free end frame 69.

[ inside locking mechanism ]

As shown in fig. 16 and 17, an inner lock mechanism 92 is provided for holding the position of the base end side (base end frame 66) of the straw holder 50 on the right side of the front-rear direction frame 36R in the state where the straw holder 50 is located at the lowered position. The inner lock mechanism 92 holds the position of the rear portion of the base end frame 66 on the right front-rear direction frame 36R. The inner lock mechanism 92 includes an inner hook 93 and an inner hook pin 94.

The inside hook 93 is detachably fixed to the right side wall of the link frame portion 76 (the groove plate 78) in the base end frame 66 by a bolt 95. The inner hook 93 includes a pair of front and rear hook portions 93 a. A coupling plate 93b is provided across the front hook 93a and the rear hook 93a to couple the two.

The inner hook pin 94 is supported by the right front-rear direction frame 36R via a first bracket 96 and a second bracket 97. The first bracket 96 is fixed (e.g., welded) to the front-rear facing frame 36R on the right side. The second bracket 97 is detachably fixed to the first bracket 96 by a bolt 98. The inner hook pin 94 is disposed across the front wall portion and the rear wall portion of the second bracket 97.

[ action of the inner locking mechanism ]

The inner lock mechanism 92 is engaged with the right forward/backward facing frame 36R as the straw holder 50 swings to the lower position side, and is disengaged from the right forward/backward facing frame 36R as the straw holder 50 swings to the upper position side.

Specifically, as the straw holder 50 swings to the lower position side, the inner hook 93 engages with the inner hook pin 94. Then, as the straw holder 50 swings to the side of the raised position, the inner hook 93 is disengaged from the inner hook pin 94. Here, the inner hook pin 94 enters the step portion 66a when the straw holder 50 goes from the lowered position to the raised position side. Thus, the base end frame 66 does not interfere with the inner side hook pin 94 as the straw frame 50 swings up and down.

[ outside locking mechanism ]

As shown in fig. 18 and 19, an outside lock mechanism 100 is provided to hold the position of the free end side (free end frame 69) of the straw holder 50 in the rear frame 37 in a state where the straw holder 50 is at the lowered position. The outer lock mechanism 100 includes an outer hook 101 and an outer hook pin 102. The outer hook 101 includes a base portion 101a and a hook portion 101 b. The hook 101b is detachably fixed to the base 101a by a bolt 103.

The outer hook pin 102 is disposed at a position slightly distant from the rear frame 37 at a position adjacent to the left side of the rear frame 37. The outer hook pin 102 is supported by the rear frame 37 via a first bracket 104 and a second bracket 105 (see fig. 14).

The outer lock mechanism 100 holds the rear position of the left front-rear direction frame 36L to the rear frame 37. The left front-rear frame 36L and the rear frame 37 are detachably coupled by the outer lock mechanism 100. In a state where the left front-rear direction frame 36L and the rear frame 37 are coupled by the outer lock mechanism 100, the rear frame 37 is positioned at a position adjacent to the right side of the left front-rear direction frame 36L. That is, the rear frame 37 includes a portion adjacent to the left front-rear direction frame 36L in a state of being coupled to the left front-rear direction frame 36L by the outer lock mechanism 100. The free end frame 69 is in contact with the rear frame 37 in the up-down direction in a state where the left front-rear direction frame 36L and the rear frame 37 are coupled by the outer lock mechanism 100. Specifically, the free end frame 69 contacts the rear frame 37 from above with respect to the rear frame 37 in a state where the left front-rear direction frame 36L and the rear frame 37 are coupled by the outer lock mechanism 100. That is, the free end frame 69 is sandwiched in the vertical direction by the rear frame 37 and the coupling mechanism 87 (straw-side fixing bracket 89) (sandwich structure).

[ Link mechanism ]

As shown in fig. 6 to 9, a link mechanism 106 is provided for linking the threshing cylinder locking mechanism 42 (the hook plate 43 on the rear side) and the outside locking mechanism 100 (the outside hook 101). The link mechanism 106 includes a first link arm 107, a second link arm 108, and a link 109. The first link arm 107 is connected to a base end portion of the rear hook plate 43 so as to be relatively swingable. The first link arm 107 and the second link arm 108 are coupled to be relatively swingable.

The link 109 is supported by the left front-rear facing frame 36L via a front bracket 110 and a rear bracket 111. The link 109 is rotatably supported by a front bracket 110 and a rear bracket 111. A second link arm 108 is connected to a distal end portion of the link 109 so as not to be relatively swingable. The outer hook 101 is connected to the rear end of the link 109 so as not to be swingable relative thereto.

[ Lift operation part ]

As shown in fig. 20, the lift operation unit 112 for lift operation is provided in the driver unit 4. The elevation operation unit 112 includes a power switch 113, an elevation switch 114, and a descent switch 115. At the time of the raising operation, the raising switch 114 and the power switch 113 are simultaneously pressed. The raising operation is performed only during the period in which the raising switch 114 and the power switch 113 are simultaneously pressed. At the time of the lowering operation, the lowering switch 115 and the power switch 113 are simultaneously pressed. The lowering operation is performed only during the period in which the lowering switch 115 and the power switch 113 are simultaneously pressed. The elevation operation unit 112 may be provided on, for example, the left side of the threshing device 10 so that an operator can operate the operation unit from outside the machine, in addition to the cab 4 (or instead of the cab 4).

[ rear upper cover ]

As shown in fig. 2, 6, 23 and 24, a rear upper cover 116 is provided to cover the straw conveying device 12 from the rear upper side. Rear upper cover 116 includes a body portion 117 and an upper portion 118.

The main body 117 has a notch 117a opened to the front. The cutout 117a is formed in a substantially trapezoidal shape that is laterally long in plan view. The length of the front edge of the cutout 117a (the length in the left-right direction of the machine body) is longer than the length of the rear edge of the cutout 117a (the length in the left-right direction of the machine body).

The upper portion 118 is located above the rear of the straw conveyor 12 in the rear upper housing 116. The upper portion 118 overlaps the rear of the straw conveying device 12 when viewed from above. Upper portion 118 is provided in cutout portion 117a to close cutout portion 117 a. The upper portion 118 is supported by the main body 117 so as to be vertically swingable via a support shaft 119 extending in the left-right direction of the machine body on the rear side of the upper portion 118. The upper portion 118 is vertically swingable between a closed position for closing the straw conveying space S and an open position for opening the straw conveying space S, around a support shaft 119 extending in the left-right direction of the machine body on the rear side of the upper portion 118.

[ Link mechanism ]

An interlocking mechanism 120 is provided for swinging the upper portion 118 toward the open position side in conjunction with the swinging of the straw holder 50 toward the raised position side. The link mechanism 120 includes an arm 121 and a roller 122. The arm 121 extends from the straw rack 50 (rear rack 68) to a location below the upper portion 118. A roller 122 contactable with the contact portion 126c from below is provided at the tip end portion of the arm 121. The roller 122 is rotatable about a rotation axis extending in the front-rear direction of the machine body. The arm 121 is detachably fixed to an arm bracket 123 by a bolt 124. The arm bracket 123 is fixed (e.g., welded) to the rear frame 68.

A main body holder 125 is fixed to an inner surface of the main body 117 by a bolt. An upper portion bracket 126 is fixed (e.g., welded) to an inner surface portion of the upper portion 118. A support shaft 119 is provided across the body portion bracket 125 and the upper portion bracket 126. The upper portion bracket 126 includes a pair of left and right support portions 126a that support the support shaft 119, a mounting portion 126b to which the spring 127 is mounted, and a contact portion 126c with which the roller 122 can contact. The contact portion 126c is constituted by a plate-like portion extending in the body right and left direction along the inner surface of the upper portion 118.

A spring 127 is provided for urging the upper portion 118 to swing the upper portion 118 toward the closed position. A spring 127 is disposed across the upper portion 118 and the body portion 117. The end of the spring 127 on the upper portion 118 side is attached to the attachment portion 126 b. The body 117 is provided with a mounting portion 128 to which the spring 127 is mounted. The end of the spring 127 on the side of the body 117 is attached to the attachment portion 128.

Upper portion 118 is formed in a shape slightly larger than notch portion 117a in a plan view. The edge of the upper portion 118 is brought into contact with the edge of the main body 117 corresponding to the notch 117a from above, whereby the upper portion 118 is prevented from swinging to a position lower than the closed position. That is, the edge of the upper portion 118 and the edge of the main body 117 corresponding to the notch 117a form a prevention portion 129 that prevents the upper portion 118 from swinging to a position lower than the closed position.

[ lifting action of Upper frame and straw frame ]

As shown in fig. 8 and 9, when the worker performs the raising operation by the raising/lowering operation section 112, the pair of front and rear hook plates 43 are swung to the engagement releasing side by the motor M. Thereby, the engagement between the hook plate 43 (hook portion 43a) and the threshing cylinder hook pin 44 is released. Then, the outer hook 101 is swung to the engagement release side in conjunction with the swing of the rear hook plate 43 to the engagement release side.

In the coupled state in which the upper frame 40 and the straw frame 50 are coupled by the coupling mechanism 87, as shown in fig. 9 and 21, when the engagement between the outer hook 101 and the outer hook pin 102 is released, the upper frame 40 and the straw frame 50 are swung upward by the hydraulic cylinder 41. At this time, the threshing cylinder 11, the belt transmission mechanism 53, and the tension clutch mechanism 57 are also swung upward by the hydraulic cylinder 41 together with the upper frame 40 and the straw frame 50. Therefore, the positional relationship of the pulleys (the drive pulley 54 and the driven pulley 55) of the belt transmission mechanism 53 does not change.

Then, as the straw holder 50 swings to the side of the raised position, the engagement between the inner hook 93 and the inner hook pin 94 is released. Thus, the upper rack 40 and the straw rack 50 are integrally raised to the same elevation limit height.

In addition, when the straw holder 50 swings to the side of the raised position, the arm 121 pushes up the upper portion 118 via the roller 122 in conjunction with the swing of the straw holder 50 to the side of the raised position. Thus, the upper portion 118 swings to the open position side in conjunction with the swing of the straw frame 50 to the raised position side.

When the worker performs the lowering operation by the lift operation unit 112, the upper frame 40 and the straw frame 50 swing downward in accordance with the retraction operation of the hydraulic cylinder 41. Then, as the straw holder 50 swings to the lower position side, the inner hook 93 engages with the inner hook pin 94.

When the upper frame 40 and the straw frame 50 are located at the lowered position, the pair of front and rear hook plates 43 are swung to the engagement side by the motor M. Thereby, the hook plate 43 (hook portion 43a) engages with the threshing cylinder hook pin 44. Then, the outer hook 101 swings to the engagement side in conjunction with the swing of the rear hook plate 43 to the engagement side.

On the other hand, in a state where the connection between the upper frame 40 and the straw frame 50 is released (connection released state), as shown in fig. 22, when the engagement of the outer hook 101 with the outer hook pin 102 is released, only the upper frame 40 of the upper frame 40 and the straw frame 50 is swung upward by the hydraulic cylinder 41. At this time, the threshing cylinder 11 and the tension clutch mechanism 57 are also swung upward by the hydraulic cylinder 41 together with the upper frame 40. When only the upper frame 40 of the upper frame 40 and the straw frame 50 is swung upward, the belt 56 needs to be detached from the driving pulley 54 in advance. Thus, only the upper rack 40 of the upper rack 40 and the straw rack 50 is raised to the elevation limit height.

Then, the straw rack 50 is swung upward by the gas damper 71, whereby the straw rack 50 is raised to the raising limit height. As described above, the straw conveying apparatus 12 is detachable from the straw rack 50, and the straw rack 50 can be simply swung upward by detaching the straw conveying apparatus 12 from the straw rack 50.

Next, an embodiment in which the upper frame 40 and the straw frame 50 can be switched between a state in which they can be raised integrally to the same height limit (hereinafter referred to as "first mode") and a state in which they can be raised to different height limit (hereinafter referred to as "second mode") will be described with reference to fig. 25 to 31.

As shown in FIG. 25, in the first mode, the elevation limit height of the upper rack 40 and the elevation limit height of the straw rack 50 are set to the same elevation limit height H1. In addition, the swing angle of the upper frame 40 and the swing angle of the straw frame 50 are set to the same swing angle α.

In the second mode, the elevation limit height of the upper rack 40 and the elevation limit height of the straw rack 50 are set to different elevation limit heights. Specifically, the elevation limit height of the upper rack 40 is set to the elevation limit height H1, and the elevation limit height of the straw rack 50 is set to a position (elevation limit height H2) lower than the elevation limit height H1. That is, the limit height H1 of the upper frame 40 by the hydraulic cylinder 41 is set to be higher than the limit height H2 of the straw frame 50 by the gas damper 71.

In addition, the swing angle of the upper frame 40 and the swing angle of the straw frame 50 are set to be different swing angles. Specifically, the swing angle of the upper frame 40 is set to a swing angle α, and the swing angle of the straw frame 50 is set to an angle (swing angle β) smaller than the swing angle α.

In the example shown in fig. 26 to 28, as the elevating mechanism of the upper frame 40 and the straw frame 50, a hydraulic cylinder 41 for swinging the upper frame 40 upward, a gas damper 71 for swinging the straw frame 50 upward, and a coupling mechanism 87 for releasably coupling the upper frame 40 and the straw frame 50 are provided. In the example shown in fig. 26 to 28, the coupling mechanism 87 functions as a switching mechanism for switching between the first mode and the second mode. Fig. 26 shows the upper rack 40 and the straw rack 50 in a lowered position.

As shown in fig. 27, in the first mode, the upper frame 40 and the straw frame 50 are coupled (coupled state) by the coupling mechanism 87. In this coupled state, the upper frame 40 and the straw frame 50 are swung upward by the hydraulic cylinder 41, so that the upper frame 40 and the straw frame 50 are integrally raised to the same lift limit height H1.

In this case, by releasing the connection between the gas damper 71 and the straw rack 50 in advance, the gas damper 71 is not damaged even if the straw rack 50 is raised to the raising limit height H1 beyond the maximum extension length of the gas damper 71 (corresponding to the raising limit height H2).

As shown in fig. 28, in the second mode, the coupling of the upper frame 40 and the straw frame 50 is released (coupling released state). In this coupling-released state, the upper frame 40 is swung upward by the hydraulic cylinder 41 to raise the upper frame 40 to the upper-limit height H1.

Then, the straw rack 50 can be swung upward by the gas damper 71 to raise the straw rack 50 to the raising limit height H2.

As shown in fig. 29 to 31, the upper holder 40 may include a pressing portion 40a that presses the straw holder 50 from above, and the straw holder 50 may be placed on an end portion of the gas damper 71 on the straw holder 50 side so as to be separable upward from the gas damper 71. In the example shown in fig. 29 to 31, the coupling mechanism 87 also functions as a switching mechanism for switching between the first mode and the second mode. Fig. 29 shows the upper rack 40 and the straw rack 50 in a lowered position.

As shown in fig. 30, in the first mode, the upper frame 40 and the straw frame 50 are coupled (coupled state) by the coupling mechanism 87. In this coupled state, the upper frame 40 and the straw frame 50 are swung upward by the hydraulic cylinder 41, so that the upper frame 40 and the straw frame 50 are integrally raised to the same lift limit height H1.

At this time, since the straw holder 50 is placed on the end portion of the gas damper 71 on the straw holder 50 side so as to be separable upward with respect to the gas damper 71 as described above, when the straw holder 50 is raised beyond the maximum extension length of the gas damper 71 (corresponding to the raising limit height H2), the straw holder 50 is separated upward with respect to the gas damper 71. Thus, even if the straw holder 50 is raised to the rising limit height H1 beyond the maximum extension length (corresponding to the rising limit height H2) of the gas damper 71, the gas damper 71 is not damaged.

As shown in fig. 31, in the second mode, the coupling of the upper frame 40 and the straw frame 50 is released (coupling released state). In this coupling-released state, the upper frame 40 is swung upward by the hydraulic cylinder 41 to raise the upper frame 40 to the upper-limit height H1.

Thereafter, when the upper frame 40 is lowered, the pressing portion 40a presses the straw frame 50 from above, and the straw frame 50 is lowered together with the upper frame 40 in accordance with the automatic retracting operation of the gas damper 71.

In the examples shown in fig. 26 to 28 and fig. 29 to 30, a lock mechanism (not shown) may be provided to hold the position of the straw holder 50 in the rear holder 37. Thus, in the second mode, even if the upper rack 40 is raised, the position of the straw rack 50 can be maintained in the rear rack 37 by the locking mechanism so that the straw rack 50 is not raised.

Although not shown, an electric actuator (not shown) may be used as an actuator for vertically swinging the upper frame 40 instead of the hydraulic cylinder 41, and an electric actuator (not shown) may be used as an actuator for vertically swinging the straw frame 50 instead of the gas damper 71. The electric actuator may be any one of an electric motor and an electric cylinder. In this example, a control device (not shown) that controls the electric actuator has a function of switching between the first mode and the second mode.

In this example, in the second mode, when the worker lifts the upper rack 40 and the straw rack 50 to the lift limit height H2 by the lift operation of the lift operation unit 112, the upper rack 40 and the straw rack 50 are temporarily stopped at the lift limit height H2. Thereafter, the operator again performs the raising operation by the raising/lowering operation unit 112 to raise only the upper frame 40 to the upper-limit height H1.

In this example, the elevation operation unit 112 may be configured as follows. That is, the straw cutting machine may include a lifting operation unit (a lifting switch and a lowering switch) for lifting the upper frame 40 and the straw frame 50 in the first mode, a lifting operation unit (a lifting switch and a lowering switch) for lifting the upper frame 40 in the second mode, and a lifting operation unit (a lifting switch and a lowering switch) for lifting the straw frame 50 in the second mode.

[ other embodiments ]

(1) In the above embodiment, the outer lock mechanism 100 is employed. The outside lock mechanism 200 may be employed instead.

As shown in fig. 32 and 33, the outer lock mechanism 200 includes an outer hook 201, an outer hook arm 202, an outer hook spring 203, and an outer hook pin 102. The outer hook 201 is swingably supported to the rear surface portion of the rear bracket 111 via a support shaft 204. An outer hook spring 203 is provided across the outer hook 201 and the rear surface portion of the rear bracket 111, and the outer hook spring 203 biases the outer hook 201 to swing the outer hook 201 toward the engagement side. The outer hook arm 202 is fixed to the rear end portion of the link 109. An opening 201a is formed in the outer hook 201. A pin 202a projecting rearward is provided on the outer hook arm 202. The pin 202a is located in the opening 201 a. According to such a configuration, the outer hook arm 202 is engaged with the opening 201a via the pin 202a, and the outer hook pin 102 is swung to the engagement side. At this time, the outer hook 201 can be quickly engaged with the outer hook pin 102 by the biasing force of the outer hook spring 203.

(2) In the above embodiment, the base end frame 66 is formed with the step portion 66 a. However, as shown in fig. 34, the base end frame 66 may not have a portion corresponding to the step portion 66 a. In this case, the vertical position of the inner hook 93 is higher than that of the above-described embodiment, and therefore the vertical position of the inner hook pin 94 may be higher than that of the above-described embodiment.

(3) In the above embodiment, if the switching plate 29a is in the open state (the state of the cutting position), the straw rack 50 may be raised after the switching plate 29a is switched to the closed state (the state of the non-cutting position). In addition, the switching plate 29a may not be switched to the opened state (the state of the cutting position) in the state where the straw rack 50 is lifted.

(4) In the above embodiment, the upper frame 40 and the straw frame 50 are integrally swingable (i.e., provided with the coupling mechanism 87). However, instead of this, the upper frame 40 and the straw frame 50 may not be integrally swingable (that is, the coupling mechanism 87 may not be provided).

(5) In the above embodiment, the coupling mechanism 87 couples the left front-rear direction frame 36L and the free end frame 69 so as to be able to be uncoupled. However, instead of this, the coupling mechanism 87 may be configured to detachably couple the portion of the upper frame 40 other than the left front-rear direction frame 36L and the portion of the straw frame 50 other than the free end frame 69.

(6) In the above embodiment, the support shaft 70 is disposed further forward than the front-rear middle portion of the straw conveying space S. However, instead of this, the support shaft 70 may be disposed further to the rear side than the front-rear middle portion of the straw conveying space S. The support shaft 70 may be disposed at a front-rear middle portion of the straw conveying space S.

(7) In the above embodiment, the straw conveying space S is enlarged so as to be located on the left and right center sides of the machine body on the downstream side in the conveying direction at the front and rear middle portions of the straw conveying space S in a plan view. However, instead of this, the left and right widths of the straw conveying space S may be made substantially the same.

(8) In the above embodiment, the straw conveying apparatus 12 is detachable from the straw rack 50. However, instead of this, the straw conveying device 12 may be made non-detachable from the straw rack 50.

(9) In the above embodiment, the coupling mechanism 87 has a bolt-type (bolt 91) coupling structure. However, instead of this, the coupling mechanism 87 may be a one-touch type coupling structure using a lever or the like.

Industrial applicability

The present invention can be used not only in a combine with a hood but also in a combine without a hood.

< second embodiment >

[ integral structure of combine harvester ]

Fig. 35 and 36 show a semi-feeding type combine harvester. The combine harvester is provided with a machine frame 1 ' and a running device 2 ' for supporting the machine frame 1 '. A cab 3' is provided on the right side of the front of the machine body. The cab 3 'includes a cab 4' on which a driver rides and a booth 5 'covering the cab 4'. An engine (not shown) is provided below the driver section 4'.

A harvesting part 6 'for harvesting crops in a field is provided in front of the cab 3'. A grain storage tank 7 'for storing grains is provided behind the cab 3'. A grain discharging device 8 'for discharging grains in the grain storage tank 7' is provided. The left side of the machine body is provided with a conveying chain 9' for clamping and conveying the cut rice straws. A threshing device 10 'is provided on the left of the grain storage tank 7'. The threshing device 10 ' performs threshing processing on the cut and taken grain stalks conveyed by the conveying chain 9 ' through a threshing cylinder 11 '. A straw conveying device 12 'is connected and arranged at the rear side of the threshing device 10'. The straw conveying device 12 'receives the threshed straws from the conveying chain 9' and clamps and conveys the threshed straws to the rear.

[ Harvest portion ]

The harvesting portion 6' is configured for a multi-row harvest format (e.g., a six-row harvest format). The harvesting section 6 ' is provided with a plurality of (e.g. seven) dividing blades 13 ', a plurality of (e.g. six) grain lifting devices 14 ', a cutting device 15 ' and a conveying device 16 '. The seedling separating piece 13' separates the crops in the field. The grain lifting device 14' lifts the crop to be separated. The cutting device 15' cuts the crop being raised. The conveying device 16 'conveys the harvested crop rearwardly toward the threshing device 10'.

[ threshing device, etc. ]

As shown in fig. 37, a threshing chamber 17 'is formed in the upper part of the threshing device 10'. A threshing cylinder 11 'is provided in the threshing chamber 17'. The threshing cylinder 11 'is rotatable about a rotation axis Y1' extending in the front-rear direction of the machine body. A screen 18 'is provided below the threshing cylinder 11'. A dust exhaust fan 19 'for exhausting dust to the outside is provided behind the threshing chamber 17'.

The lower part of the thresher 10 'is provided with a swing cleaning device 20 for conveying a cleaning target object to the rear of the machine body and screening, a cleaning fan 21 for blowing cleaning air to the swing cleaning device 20', a primary recovery unit 22 'for recovering grains (e.g., singulated grains) of a primary processed object, and a secondary recovery unit 23' for recovering grains (e.g., branched grains) of a secondary processed object.

The primary recovery unit 22 'is provided with a primary auger 24' for feeding grains of the primary treatment product to the right. A vertical grain feeder 25 ' for vertically feeding grains of the primary processed product to the grain storage tank 7 ' is linked to the right end of the primary screw 24 '.

The secondary recovery unit 23 'is provided with a secondary auger 26' for feeding grains of the secondary treatment product to the right. A secondary returning device 27 ' for returning grains of the secondary processed material to the swinging cleaning device 20 ' is linked to the right end of the secondary auger 26 '.

Below the rear part of the straw conveyor 12 ', there is provided a straw cutting device 28 ' that cuts the straw conveyed by the straw conveyor 12 '. A cover 29 'is provided which covers the straw cutting means 28'. A switching plate 29a ' is provided in a portion of the cover 29 ' above the straw cutting device 28 '. The switching plate 29 a' can be swung to open and close between a cutting position on the rising side and a non-cutting position on the falling side about a swing axis extending in the left-right direction of the machine body. In a state where the switching plate 29a ' is opened (a state of the cutting position), the straw conveyed by the straw conveying device 12 ' is thrown into the straw cutting device 28 '. In a state where the switch plate 29a ' is closed (a state of a non-cutting position), the straw conveyed by the straw conveying device 12 ' slides over the upper surface of the switch plate 29a ' and falls to the ground.

As shown in fig. 37 to 41, wall portions 30 'are provided at the front end and the rear end of the threshing chamber 17'. The wall 30 'on the front side constitutes a front wall of the threshing chamber 17'. The rear wall 30 'constitutes the rear wall of the threshing chamber 17'. The wall portion 30 ' includes a movable wall 31 ' and a fixed wall 32 '. The threshing cylinder 11 ' is rotatably supported by the movable wall 31 ' via a threshing cylinder shaft 11a '. A connecting arm 33 ' for connecting the movable wall 31 ' and the fixed wall 32 ' is provided across the two walls. The movable wall 31 'is supported by the fixed wall 32' via the connecting arm 33 'so as to be vertically swingable about a swing axis Y2' extending in the front-rear direction of the machine body. A transmission shaft 34 ' for transmitting power of the engine is provided across the front side fixing wall 32 ' and the rear side fixing wall 32 '.

In the threshing device 10 ', the right side is constituted by a right side wall 35'. The right side wall 35' extends to the rear end of the body. The right side wall 35 'includes an inclined portion 35 a'. The inclined portion 35a 'is inclined so as to be located more rearward than the rear wall portion 30' and more toward the center of the left and right sides of the machine body.

Front and rear facing frames 36L ' and 36R ' extending in the front-rear direction of the body are provided on both left and right side portions of the threshing device 10 '. The left front-rear direction frame 36L 'extends to the rear side of the rear end of the threshing cylinder 11'. The left front-rear direction frame 36L' is formed of a square pipe having a substantially square cross-sectional shape. The right forward and backward facing frame 36R 'extends to the rear side of the rear end of the threshing cylinder 11'. The right front-rear facing shelf 36R 'supports the front side fixing wall 32', the rear side fixing wall 32 ', and the right side wall 35'. The right front-rear direction frame 36R' is formed of a square tube having a substantially rectangular cross-sectional shape (a substantially rectangular shape that is long in the lateral direction).

[ rear frame ]

A rear frame 37' is provided at the rear upper portion of the body. The rear frame 37 'is located outside the body in the threshing device 10' in the left-right direction of the body. The rear frame 37 'is formed in a substantially U shape protruding rearward from the rear of the threshing device 10' when viewed from the side. The rear frame 37' is formed of a circular tube.

[ Upper cover ]

An upper cover 38 'is provided to cover the threshing cylinder 11' from above. The upper hood 38 ' extends to above the rear of the straw conveyor 12 ' at a position further to the rear than the rear end of the threshing cylinder 11 '. A right upper cover 39 'is provided adjacent to the right side of the upper cover 38'. The upper right hood 39 ' extends above the rear of the straw conveyor 12 ' at a position further to the rear than the rear end of the threshing cylinder 11 '. The right upper cover 39 'is supported by the right forward/backward facing frame 36R' so as to be vertically swingable about a swing axis extending in the forward/backward direction of the machine body.

[ Upper frame ]

The upper cage 38 'is supported by the upper frame 40'. The upper frame 40 'can swing up and down around the transmission shaft 34' extending in the front-rear direction of the machine body. The upper frame 40 ' is supported by the front wall 30 ' and the rear wall 30 ' via the transmission shaft 34 ' so as to be vertically swingable around a swing axis Y2 '. The upper frame 40 ' includes a pair of front and rear movable walls 31 ' and a left front and rear facing frame 36L '. The left front-rear direction frame 36L 'is located outside the machine body in the left-right direction of the machine body in the upper frame 40'.

A hydraulic cylinder 41 'for swinging the upper frame 40' upward is provided. The hydraulic cylinder 41 ' is provided across the movable wall 31 ' on the rear side and the fixed wall 32 ' on the rear side. The hydraulic cylinder 41' is constituted by a double acting hydraulic cylinder, for example. However, the hydraulic cylinder 41' may be a single-acting hydraulic cylinder.

[ locking mechanism of threshing cylinder ]

The threshing cylinder 11 ' can be swung upward together with the upper frame 40 ' by the hydraulic cylinder 41 '. A threshing cylinder locking mechanism 42 'is provided for holding the position of the threshing cylinder 11' at a threshing position where threshing is performed. The threshing cylinder locking mechanism 42 ' includes a pair of front and rear hook plates 43 ' and a pair of front and rear threshing cylinder hook pins 44 '. The hook plate 43 'is supported by the front wall 30' and the rear wall 30 'so as to be swingable around a swing axis Y3' in the front-rear direction of the machine body. A hook 43a ' engageable with the threshing cylinder hook pin 44 ' is provided at the tip of the hook plate 43 '. The hook 43a ' is engaged with the threshing cylinder hook pin 44 ', whereby the position of the threshing cylinder 11 ' is held at the threshing processing position. By releasing the engagement of the hook 43a ' with the threshing cylinder hook pin 44 ', the threshing cylinder 11 ' is swung upward together with the upper frame 40 ' by the hydraulic cylinder 41 '. A motor M ' for driving the front and rear pair of hook plates 43 ' to swing is supported on the rear surface of the rear wall portion 30 '. The front and rear pair of hook plates 43 'are swung to the engagement side and the disengagement side by the motor M'.

[ straw conveying device ]

As shown in fig. 40 and 41, the straw conveying device 12' is disposed in an inclined state in which it is positioned more toward the center of the left and right of the machine body as it goes toward the rear. The straw conveying device 12 ' includes a stem root conveying device 45 ' for clamping and conveying the stem root side of the straw and an ear tip conveying device 46 ' for clamping and stopping the ear tip side of the straw. The stalk root conveyor 45 'is provided with a stalk chain 47' having a protrusion 47a 'and a stalk guide 48'. The straw guide 48 ' is disposed below the straw chain 47 ' in a state facing the lower path of the straw chain 47 '. The ear tip conveyor 46 ' has a straw ear tip chain 49 ' with spring teeth 49a '.

The straw conveying device 12 'is supported on the straw rack 50'. The straw conveying device 12 'is detachable from the straw rack 50'. The straw conveying device 12 'is suspended and supported on the straw rack 50' through a front bracket 51 'and a rear bracket 52'. The straw conveying device 12 'is detachably fixed to the front bracket 51' by bolts. The straw conveying device 12 'is detachably fixed to the rear bracket 52' by bolts.

The straw conveying space S ' of the straw conveying device 12 ' is formed behind the wall 30 ' on the rear side. The straw conveying space S 'is formed across the straw rack 50' in the front-rear direction of the body. The straw conveying space S ' is enlarged in a front-rear middle portion (a portion corresponding to the front end of the inclined portion 35a ') of the straw conveying space S ' in a plan view so as to be located on the left-right center side of the machine body toward the downstream side in the conveying direction.

[ with transmission mechanism ]

As shown in fig. 40, 42 and 43, a belt transmission mechanism 53 ' for transmitting the power of the transmission shaft 34 ' to the straw conveying device 12 ' is provided across the transmission shaft 34 ' and the straw conveying device 12 '. The belt transmission mechanism 53 'includes a drive pulley 54', a driven pulley 55 ', and a transmission belt 56'. The drive pulley 54 ' is fixed to a portion of the transmission shaft 34 ' that protrudes rearward from the rear fixing wall 32 '. The driven pulley 55 'is fixed to an input shaft (not shown) of the straw conveying device 12'. The transmission belt 56 ' is wound around the drive pulley 54 ' and the driven pulley 55 '.

[ tension clutch mechanism ]

A tension clutch mechanism 57 'is provided for switching the belt transmission mechanism 53' between a power transmission state for transmitting power to the straw conveying device 12 'and a power transmission cutoff state for cutting off power transmission to the straw conveying device 12'. The tension clutch mechanism 57 'includes a first tension arm 58', a first tension roller 59 ', a second tension arm 60', a second tension roller 61 ', and a tension spring 62'. The first tensioning arm 58 'is rotatably supported to the drive shaft 34'. A first tension roller 59 'is rotatably supported at a front end portion of the first tension arm 58'. The first tension roller 59 'comes into contact with a portion of the belt 56' corresponding to the lower side path from above. A mounting portion 63 ' to which the tension spring 62 ' is mounted is provided at a base end portion of the first tension arm 58 '.

The second tensioning arm 60 ' is fixed to the first tensioning arm 58 ' so as to be rotatable integrally with the first tensioning arm 58 '. A second tension roller 61 'is rotatably supported at a front end portion of the second tension arm 60'. The second tension roller 61 'contacts a portion of the belt 56' corresponding to the upper side path from above.

The tension spring 62 'urges the first tension arm 58' and the second tension arm 60 'to swing the first tension arm 58' and the second tension arm 60 'about the swing shaft center Y2' in the tension applying direction. The end of the tension spring 62 ' opposite the mounting portion 63 ' is mounted to the rod 64 '. The rod 64 'is supported in a position-adjustable manner on a bracket 65'. The bracket 65 ' is fixed (e.g., welded) to the straw frame 50 ' (the front frame 67 '). By adjusting the position of the lever 64 ' relative to the bracket 65 ', the force of the tensioning spring 62 ' is varied.

[ straw rack ]

As shown in fig. 40 to 45, the straw rack 50 'supports the front and rear of the straw conveying device 12' via the front bracket 51 'and the rear bracket 52'. The straw frame 50' is formed in a frame shape. Straw rack 50 ' includes base end frame 66 ', front frame 67 ', rear frame 68 ', and free end frame 69 '. A circular tube is bent to form a front frame 67 ', a rear frame 68 ' and a free end frame 69 '. The front of the straw conveyor 12 ' is supported by the free end frame 69 ' via the front bracket 51 '. The rear portion of the straw conveyor 12 ' is supported by the central left and right portions of the machine body in the rear frame 68 ' via the rear bracket 52 '.

The straw rack 50 'can swing up and down around a swing axis Y2' between a descending position where the straw conveying device 12 'conveys straws and an ascending position where the straw conveying device 12' does not convey straws. The straw frame 50 'can swing up and down around a support shaft 70' extending in the front-rear direction of the machine body. A pair of front and rear gas dampers 71 'for swinging the straw rack 50' upward are provided. The gas damper 71 'is disposed across the straw rack 50' (the front rack 67 ') and the lower rack 72'. An upper bracket 73 ' to which the gas damper 71 ' is coupled is fixed (e.g., welded) to the front bracket 67 '.

As shown in fig. 46 to 48, the base end frame 66 'is provided on the base end side of the straw frame 50' and extends in the front-rear direction of the machine body. The base end frame 66 'includes a front side frame portion 74' constituting the front side, a rear side frame portion 75 'constituting the rear side, and a connecting frame portion 76' extending over the front side frame portion 74 'and the rear side frame portion 75'. The front portion (front portion side frame portion 74 ') of the base end frame 66' is supported by the support shaft 70 'via a pair of front and rear brackets 77'.

A stepped portion 66a ' recessed downward is formed in the base end frame 66 ' at a portion corresponding to the coupling frame portion 76 '. The connecting frame portion 76 ' includes a groove plate 78 ' and a connecting plate 79 ' that open downward. A channel plate 78 ' is provided across the lower surface of the front and rear side frame portions 74 ', 75 '. Inside the groove plate 78 ', a coupling plate 79 ' is provided to connect the left and right side walls of the groove plate 78 ' across the both.

The front frame 67 ' is coupled to the front end of the base end frame 66 ' and extends from the support shaft 70 ' side toward the outside of the body in the left-right direction of the body. The rear frame 68 ' is coupled to the rear end of the base end frame 66 ' and extends from the support shaft 70 ' side toward the outside of the body in the left-right direction of the body.

The free end frame 69 'is provided on the free end side of the straw frame 50' and extends in the body front-rear direction. The free end frame 69 ' is coupled to an end portion of the front frame 67 ' that is outside the machine body in the left-right direction of the machine body and an end portion of the rear frame 68 ' that is outside the machine body in the left-right direction of the machine body. The free end frame 69 'extends along the left anteroposterior facing frame 36L' at the lowered position, and is adjacent to the left anteroposterior facing frame 36L 'in a state of being located at a right side adjacent position of the left anteroposterior facing frame 36L'.

The support shaft 70 ' and the transmission shaft 34 ' are different shafts, and the support shaft 70 ' is supported by the right forward and backward facing frame 36R ', which supports the transmission shaft 34 '. The transmission shaft 34 ' and the support shaft 70 ' are disposed on the same axis (swing axis Y2 '). The support shaft 70 ' is disposed forward of the middle portion of the straw conveying space S ' (the portion corresponding to the front end of the inclined portion 35a '). The right front-rear oriented frame 36R 'extends to the rear side more than the support shaft 70'. The support shaft 70 ' is supported by a bracket 81 ' via a pair of front and rear brackets 80 '. Bracket 81 'is suspended from the lower surface of right front-rear facing shelf 36R'. The bracket 80 'is fixed to the bracket 81' with bolts. A lower bracket 72 'is supported on the bracket 80' on the front side.

[ positioning mechanism ]

As shown in fig. 48, a positioning mechanism 82 'is provided which positions the free end side (free end frame 69') of the straw holder 50 'at the rear frame 37' in a state where the straw holder 50 'is at the lowered position so that the straw holder 50' is not positionally displaced (not positionally displaced in the machine body front-rear direction or the like). The positioning mechanism 82 'includes a claw portion 83' and an inserted portion 84 'into which the claw portion 83' is inserted. The claw portion 83 ' is supported by the free end frame 69 ' via a bracket 85 '. The claw portion 83 ' is detachably fixed to the bracket 85 ' by a bolt 86 '. The inserted portion 84 'is fixed (e.g., welded) to the rear frame 37'. By inserting the claw portion 83 ' into the inserted portion 84 ', the free end side (free end frame 69 ') of the straw holder 50 ' is positioned at the rear frame 37 ' in a state where the straw holder 50 ' is at the lowered position, so that the straw holder 50 ' is not positionally displaced (not positionally displaced in the machine body front-rear direction or the like).

[ connecting mechanism ]

As shown in fig. 48 and 49, a coupling mechanism 87 ' is provided for releasably coupling the upper frame 40 ' (left forward and backward frame 36L ') and the straw frame 50 ' (free end frame 69 '). The coupling mechanism 87 'can couple the left front-rear direction frame 36L' and the end portion (free end frame 69 ') of the straw frame 50' that is outside the machine body in the left-right direction of the machine body. The link mechanism 87 ' is provided across the upper portion of the left front-rear direction frame 36L ' and the upper portion of the free end frame 69 '. The coupling mechanism 87 'includes an upper side fixing bracket 88', a straw side fixing bracket 89 ', and a coupling bracket 90'. The upper side fixing bracket 88 'is fixed (e.g., welded) to the front-rear facing frame 36L' on the left side. The straw side mounting bracket 89 'is fixed (e.g., welded) to the front of the free end frame 69'. The linking bracket 90 ' is provided across the upper surface of the upper side fixing bracket 88 ' and the upper surface of the straw side fixing bracket 89 '. The coupling bracket 90 'is coupled to the upper fixing bracket 88' and the straw fixing bracket 89 'by bolts 91' so as to be releasable from each other. That is, the coupling mechanism 87 ' can be decoupled from the left front-rear direction frame 36L ' and the free end frame 69 '.

[ inside locking mechanism ]

As shown in fig. 50 and 51, an inner lock mechanism 92 'is provided for holding the position of the base end side (base end frame 66) of the straw holder 50' on the right side of the front-rear direction frame 36R 'in the state where the straw holder 50' is at the lowered position. The inner lock mechanism 92 ' maintains the position of the rear portion of the base end frame 66 ' on the right front-rear facing frame 36R '. The inner lock mechanism 92 ' includes an inner hook 93 ' and an inner hook pin 94 '.

The inside hook 93 ' is detachably fixed to the right side wall of the attachment frame portion 76 ' (the groove plate 78 ') in the base end frame 66 ' by a bolt 95 '. The inner hook 93 'includes a pair of front and rear hook portions 93 a'. A coupling plate 93b ' is provided across the front hook 93a ' and the rear hook 93a ' to couple the two.

The inner hook pin 94 'is supported on the right front-rear facing frame 36R' via the first bracket 96 'and the second bracket 97'. The first bracket 96 'is fixed (e.g., welded) to the front-to-rear facing shelf 36R' on the right side. The second bracket 97 ' is detachably fixed to the first bracket 96 ' by a bolt 98 '. The inner hook pin 94 'is provided across the front wall portion and the rear wall portion of the second bracket 97'.

[ action of the inner locking mechanism ]

The inner lock mechanism 92 ' engages with the right forward/backward facing frame 36R ' as the straw holder 50 ' swings to the lower position side, and disengages from the right forward/backward facing frame 36R ' as the straw holder 50 ' swings to the upper position side.

Specifically, as the straw holder 50 ' swings to the lower position side, the inner hook 93 ' engages with the inner hook pin 94 '. Then, as the straw holder 50 ' swings to the side of the raised position, the inner hook 93 ' is disengaged from the inner hook pin 94 '. Here, the inner side hook pin 94 ' enters into the step portion 66a ' when the straw rack 50 ' goes from the lowered position to the raised position side. Thus, the base end shelf 66 ' does not interfere with the inner side hook pin 94 ' when the straw shelf 50 ' swings up and down.

[ outside locking mechanism ]

As shown in fig. 52 and 53, an outside lock mechanism 100 ' is provided to hold the position of the free end side (free end frame 69 ') of the straw holder 50 ' at the rear frame 37 ' in a state where the straw holder 50 ' is at the lowered position. The outer lock mechanism 100 ' includes an outer hook 101 ' and an outer hook pin 102 '. The outer hook 101 ' includes a base portion 101a ' and a hook portion 101b '. The hook 101b ' is detachably fixed to the base 101a ' by a bolt 103 '.

The outer hook pin 102 ' is disposed at a position slightly distant from the rear frame 37 ' at a position adjacent to the left side of the rear frame 37 '. The outer hook pin 102 'is supported by the rear frame 37' via a first bracket 104 'and a second bracket 105' (see fig. 48).

The outer lock mechanism 100 ' holds the rear position of the left front-rear direction frame 36L ' to the rear frame 37 '. The left front-rear frame 36L ' and the rear frame 37 ' are releasably coupled by an outer lock mechanism 100 '. In a state where the left front-rear oriented frame 36L ' and the rear frame 37 ' are coupled by the outside lock mechanism 100 ', the rear frame 37 ' is positioned adjacent to the left front-rear oriented frame 36L ' on the right side. That is, the rear frame 37 'includes a portion adjacent to the left front-rear frame 36L' in a state of being connected to the left front-rear frame 36L 'by the outer lock mechanism 100'. The free end frame 69 ' is in contact with the rear frame 37 ' in the up-down direction in a state where the left front-rear oriented frame 36L ' and the rear frame 37 ' are coupled by the outside lock mechanism 100 '. Specifically, the free end frame 69 'contacts the rear frame 37' from above with respect to the rear frame 37 'in a state where the left front-rear oriented frame 36L' and the rear frame 37 'are linked by the outer lock mechanism 100'. That is, the free end frame 69 'is sandwiched in the vertical direction by the rear frame 37' and the coupling mechanism 87 '(straw-side fixing bracket 89') (sandwich structure).

[ Link mechanism ]

As shown in fig. 40 to 43, a link mechanism 106 ' is provided for linking the threshing cylinder locking mechanism 42 ' (the hook plate 43 ' on the rear side) and the outer locking mechanism 100 ' (the outer hook 101 ') in an interlocking manner. The link mechanism 106 'includes a first link arm 107', a second link arm 108 ', and a link 109'. The first link arm 107 'is connected to the base end of the rear hook plate 43' so as to be relatively swingable. The first link arm 107 'and the second link arm 108' are coupled to be relatively swingable.

The link 109 'is supported by the left front-rear oriented frame 36L' via the front bracket 110 'and the rear bracket 111'. The link 109 ' is rotatably supported by the front bracket 110 ' and the rear bracket 111 '. A second link arm 108 'is connected to the tip end of the link 109' so as not to be relatively swingable. An outer hook 101 'is connected to a rear end of the link 109' so as not to be swingable relative thereto.

[ lifting operation part ]

As shown in fig. 54, a lifting operation unit 112 'for lifting operation is provided in the driver unit 4'. The up-down operation unit 112 'includes a power switch 113', an up switch 114 ', and a down switch 115'. At the time of the rising operation, the rising switch 114 'and the power switch 113' are simultaneously pressed. The rising operation is performed only during the period in which the rising switch 114 'and the power switch 113' are simultaneously pressed. At the time of the lowering operation, the lowering switch 115 'and the power switch 113' are simultaneously pressed. The lowering operation is performed only during the period in which the lowering switch 115 'and the power switch 113' are simultaneously pressed. The elevation operation unit 112 'may be provided in addition to the cab 4' (or instead of the cab 4 '), for example, in a left side portion of the threshing device 10' so that an operator can operate the device from outside the machine.

[ rear upper cover ]

As shown in fig. 36, 40, 57 and 58, a rear upper cover 116 'is provided to cover the straw conveying device 12' from the rear upper side. The rear upper cover 116 ' is provided with a body portion 117 ' and an upper portion 118 '.

The main body 117 'has a cutout portion 117 a' that opens forward. The notch 117 a' is formed in a substantially trapezoidal shape that is laterally long in a plan view. The length of the front edge of the cutout 117a '(the length in the left-right direction of the machine body) is longer than the length of the rear edge of the cutout 117 a' (the length in the left-right direction of the machine body).

The upper portion 118 ' is located above the rear of the straw conveyor 12 ' in the rear upper housing 116 '. The upper portion 118 'overlaps the rear of the straw conveying device 12' when viewed from above. Upper portion 118 ' is provided in cutout portion 117a ' to close cutout portion 117a '. The upper portion 118 'is supported by the main body 117' so as to be vertically swingable via a support shaft 119 'extending in the left-right direction of the machine body on the rear side of the upper portion 118'. The upper portion 118 ' can swing up and down between a closed position closing the straw conveying space S ' and an open position opening the straw conveying space S ' around a support shaft 119 ' extending in the left-right direction of the machine body on the rear side of the upper portion 118 '.

[ Link mechanism ]

A link mechanism 120 ' is provided for swinging the upper portion 118 ' toward the open position side in conjunction with the swinging of the straw rack 50 ' toward the raised position side. The link mechanism 120 ' includes an arm 121 ' and a roller 122 '. The arm 121 'extends from the straw rack 50' (rear rack 68 ') to a location below the upper portion 118'. A roller 122 ' that can contact the contact portion 126c ' from below is provided at the tip end portion of the arm 121 '. The roller 122' is rotatable about a rotation axis extending in the front-rear direction of the machine body. The arm 121 ' is detachably fixed to the arm bracket 123 ' by a bolt 124 '. The arm bracket 123 'is fixed (e.g., welded) to the rear frame 68'.

A main body holder 125 'is fixed to an inner surface portion of the main body 117' by a bolt. An upper portion bracket 126 'is secured (e.g., welded) to an inner surface portion of the upper portion 118'. A support shaft 119 ' is provided across the body portion bracket 125 ' and the upper portion bracket 126 '. The upper portion bracket 126 ' includes a pair of left and right support portions 126a ' supporting the support shaft 119 ', an attachment portion 126b ' to which a spring 127 ' is attached, and a contact portion 126c ' with which the roller 122 ' can come into contact. The contact portion 126c 'is constituted by a plate-like portion extending in the body right and left direction along the inner surface of the upper portion 118'.

A spring 127 ' is provided for urging the upper portion 118 ' to swing the upper portion 118 ' toward the closed position side. Spring 127 ' is disposed across upper portion 118 ' and body portion 117 '. The end of the spring 127 ' on the upper portion 118 ' side is attached to the attachment portion 126b '. The body 117 ' is provided with a mounting portion 128 ' to which the spring 127 ' is mounted. The end of the spring 127 ' on the side of the body 117 ' is attached to the attachment portion 128 '.

Upper portion 118 'is formed in a shape slightly larger than notch portion 117 a' in a plan view. By making the edge of the upper portion 118 'abut on the edge of the main body 117' corresponding to the notch portion 117a 'from above, the upper portion 118' is prevented from swinging to a position lower than the closed position. That is, the edge of the upper portion 118 ' and the edge of the main body 117 ' corresponding to the notch 117a ' form a stopper 129 ' for preventing the upper portion 118 ' from swinging to a position lower than the closed position.

[ lifting action of Upper frame and straw frame ]

As shown in fig. 42 and 43, when the worker performs the raising operation by the raising/lowering operation section 112 ', the pair of front and rear hook plates 43 ' are swung to the engagement releasing side by the motor M '. Thereby, the engagement of the hook plate 43 ' (hook portion 43a ') with the threshing cylinder hook pin 44 ' is released. Then, the outer hook 101 'is swung to the engagement release side in conjunction with the swing of the rear hook plate 43' to the engagement release side.

In the coupled state in which the upper frame 40 'and the straw frame 50' are coupled by the coupling mechanism 87 ', when the engagement between the outer hook 101' and the outer hook pin 102 'is released as shown in fig. 43 and 55, the upper frame 40' and the straw frame 50 'are swung upward by the hydraulic cylinder 41'. At this time, the threshing cylinder 11 ', the belt transmission mechanism 53', and the tension clutch mechanism 57 'are also swung upward by the hydraulic cylinder 41' together with the upper frame 40 'and the straw frame 50'. Therefore, the positional relationship of the pulleys (the drive pulley 54 ', the driven pulley 55 ') of the belt transmission mechanism 53 ' does not change.

Then, as the straw holder 50 ' swings to the rising position side, the engagement between the inner hook 93 ' and the inner hook pin 94 ' is released. In this way, the upper rack 40 'and the straw rack 50' are integrally raised to the same elevation limit height.

In addition, when the straw holder 50 ' swings to the side of the raised position, the arm 121 ' pushes up the upper portion 118 ' via the roller 122 ' in conjunction with the swing of the straw holder 50 ' to the side of the raised position. Thus, the upper portion 118 'swings to the open position side in conjunction with the swing of the straw rack 50' to the raised position side.

When the worker performs the lowering operation by the lift operation unit 112 ', the upper frame 40' and the straw frame 50 'swing downward in accordance with the retraction operation of the hydraulic cylinder 41'. Then, as the straw holder 50 ' swings to the lower position side, the inner hook 93 ' engages with the inner hook pin 94 '.

When the upper frame 40 'and the straw frame 50' are located at the lowered positions, the pair of front and rear hook plates 43 'are swung to the engagement side by the motor M'. Thereby, the hook plate 43 ' (hook portion 43a ') is engaged with the threshing cylinder hook pin 44 '. Then, the outer hook 101 'swings to the engagement side in conjunction with the swing of the rear hook plate 43' to the engagement side.

On the other hand, in a state where the connection between the upper frame 40 'and the straw frame 50' is released (connection released state), as shown in fig. 56, when the engagement of the outer hook 101 'with the outer hook pin 102' is released, only the upper frame 40 'of the upper frame 40' and the straw frame 50 'is swung upward by the hydraulic cylinder 41'. At this time, the threshing cylinder 11 'and the tightening clutch mechanism 57' are also swung upward by the hydraulic cylinder 41 'together with the upper frame 40'. When only the upper rack 40 ' of the upper rack 40 ' and the straw rack 50 ' is swung upward, the transmission belt 56 ' needs to be detached from the driving pulley 54 '. Thus, only the upper rack 40 ' of the upper rack 40 ' and the straw rack 50 ' is raised to the lift limit height.

Then, the straw rack 50 ' is swung upward by the gas damper 71 ', so that the straw rack 50 ' is raised to the raising limit height. As described above, the straw conveying device 12 ' is detachable from the straw rack 50 ', and only the straw rack 50 ' can be swung upward by detaching the straw conveying device 12 ' from the straw rack 50 '.

Next, an embodiment in which the upper frame 40 'and the straw frame 50' can be switched between a state in which they can be raised integrally to the same height limit (hereinafter referred to as "first mode") and a state in which they can be raised to different height limit (hereinafter referred to as "second mode") will be described with reference to fig. 59 to 65.

As shown in FIG. 59, in the first mode, the elevation limit height of the upper rack 40 'and the elevation limit height of the straw rack 50' are set to the same elevation limit height H1. In addition, the swing angle of the upper frame 40 'and the swing angle of the straw frame 50' are set to the same swing angle α.

In the second mode, the elevation limit heights of the upper rack 40 'and the straw rack 50' are set to different elevation limit heights. Specifically, the elevation limit height of the upper rack 40 'is set to the elevation limit height H1, and the elevation limit height of the straw rack 50' is set to a position (elevation limit height H2) lower than the elevation limit height H1. That is, the limit height H1 of the upper frame 40 'that is raised by the hydraulic cylinder 41' is set to a position higher than the limit height H2 of the straw frame 50 'that is raised by the gas damper 71'.

In addition, the swing angle of the upper frame 40 'and the swing angle of the straw frame 50' are set to different swing angles. Specifically, the swing angle of the upper frame 40 'is set to a swing angle α, and the swing angle of the straw frame 50' is set to an angle (swing angle β) smaller than the swing angle α.

In the example shown in fig. 60 to 62, as the elevating mechanism of the upper frame 40 ' and the straw frame 50 ', a hydraulic cylinder 41 ' for swinging the upper frame 40 ' upward, a gas damper 71 ' for swinging the straw frame 50 ' upward, and a coupling mechanism 87 ' for releasably coupling the upper frame 40 ' and the straw frame 50 ' are provided. In the example shown in fig. 60 to 62, the coupling mechanism 87' functions as a switching mechanism for switching between the first mode and the second mode. FIG. 60 shows the upper rack 40 'and straw rack 50' in a lowered position.

As shown in fig. 61, in the first mode, the upper rack 40 ' and the straw rack 50 ' are coupled (coupled state) by the coupling mechanism 87 '. In this coupled state, the upper frame 40 ' and the straw frame 50 ' are swung upward by the hydraulic cylinder 41 ' so that the upper frame 40 ' and the straw frame 50 ' are integrally raised to the same height H1.

In this case, by releasing the connection between the gas damper 71 ' and the straw rack 50 ', the gas damper 71 ' is not damaged even if the straw rack 50 ' is raised to the raising limit height H1 beyond the maximum extension length (corresponding to the raising limit height H2) of the gas damper 71 '.

As shown in FIG. 62, in the second mode, the coupling of the upper frame 40 'and the straw frame 50' is released (coupling released state). In the coupling released state, the upper frame 40 ' is swung upward by the hydraulic cylinder 41 ' to raise the upper frame 40 ' to the raising limit height H1.

Then, the straw rack 50 ' can be swung upward by the gas damper 71 ' to raise the straw rack 50 ' to the raising limit height H2.

As shown in fig. 63 to 65, the upper frame 40 ' may be provided with a pressing portion 40a ' for pressing the straw frame 50 ' from above, and the straw frame 50 ' may be placed on the end portion of the gas damper 71 ' on the straw frame 50 ' side so as to be separable upward from the gas damper 71 '. In the example shown in fig. 63 to 65, the coupling mechanism 87' also functions as a switching mechanism for switching between the first mode and the second mode. FIG. 63 shows the upper rack 40 'and straw rack 50' in a lowered position.

As shown in fig. 64, in the first mode, the upper rack 40 ' and the straw rack 50 ' are coupled (coupled state) by the coupling mechanism 87 '. In this coupled state, the upper frame 40 ' and the straw frame 50 ' are swung upward by the hydraulic cylinder 41 ' so that the upper frame 40 ' and the straw frame 50 ' are integrally raised to the same height H1.

At this time, as described above, since the straw holder 50 'is placed on the end portion of the gas damper 71' on the straw holder 50 'side so as to be separable upward with respect to the gas damper 71', when the straw holder 50 'is raised beyond the maximum extension length (corresponding to the raising limit height H2) of the gas damper 71', the straw holder 50 'is separated upward with respect to the gas damper 71'. Thus, even if the straw rack 50 ' rises to the rising limit height H1 beyond the maximum extension length (corresponding to the rising limit height H2) of the gas damper 71 ', the gas damper 71 ' is not damaged.

As shown in fig. 65, in the second mode, the coupling of the upper frame 40 'and the straw frame 50' is released (coupling released state). In the coupling released state, the upper frame 40 ' is swung upward by the hydraulic cylinder 41 ' to raise the upper frame 40 ' to the raising limit height H1.

Thereafter, when the upper frame 40 'is lowered, the pressing portion 40 a' presses the straw frame 50 'from above, and the straw frame 50' is lowered together with the upper frame 40 'in accordance with the automatic retracting operation of the gas damper 71'.

In the examples shown in fig. 60 to 62 and fig. 63 to 64, a lock mechanism (not shown) may be provided to hold the position of the straw holder 50 'in the rear holder 37'. Thus, in the second mode, even if the upper rack 40 'is raised, the position of the straw rack 50' can be maintained at the rear rack 37 'by the locking mechanism so that the straw rack 50' does not rise.

Although not shown, an electric actuator (not shown) may be used as an actuator for vertically swinging the upper frame 40 'instead of the hydraulic cylinder 41', and an electric actuator (not shown) may be used as an actuator for vertically swinging the straw frame 50 'instead of the gas damper 71'. The electric actuator may be any one of an electric motor and an electric cylinder. In this example, a control device (not shown) that controls the electric actuator has a function of switching between the first mode and the second mode.

In this example, in the second mode, when the worker lifts the upper rack 40 ' and the straw rack 50 ' up to the lift limit height H2 by the lifting operation of the lifting operation unit 112 ', the upper rack 40 ' and the straw rack 50 ' are temporarily stopped at the lift limit height H2. Thereafter, the operator again performs the raising operation by the raising/lowering operation unit 112 'to raise only the upper frame 40' to the raising limit height H1.

In this example, the elevation operation unit 112' may be configured as follows. That is, the straw cutting machine may further include a lifting operation unit (a lifting switch and a lowering switch) for lifting the upper frame 40 'and the straw frame 50' in the first mode, a lifting operation unit (a lifting switch and a lowering switch) for lifting the upper frame 40 'in the second mode, and a lifting operation unit (a lifting switch and a lowering switch) for lifting the straw frame 50' in the second mode.

[ other embodiments ]

(1) In the above embodiment, the outside lock mechanism 100' is employed. Instead of this, the outside lock mechanism 200' may be employed.

As shown in fig. 66 and 67, the outer lock mechanism 200 ' includes an outer hook 201 ', an outer hook arm 202 ', an outer hook spring 203 ', and an outer hook pin 102 '. The outer hook 201 ' is swingably supported to the rear surface portion of the rear bracket 111 ' via a support shaft 204 '. An outer hook spring 203 'is provided across the outer hook 201' and the rear surface portion of the rear bracket 111 ', and the outer hook spring 203' biases the outer hook 201 'to swing the outer hook 201' toward the engagement side. The outer hook arm 202 'is fixed to the rear end of the link 109'. An opening 201a 'is formed in the outer hook 201'. A pin 202a 'projecting rearward is provided on the outer hook arm 202'. The pin 202a 'is located within the opening 201 a'. According to such a configuration, the outer hook arm 202 'is engaged with the opening 201 a' via the pin 202a ', and the outer hook pin 102' is swung to the engagement side. At this time, the outer hook 201 ' can be quickly engaged with the outer hook pin 102 ' by the biasing force of the outer hook spring 203 '.

(2) In the above embodiment, the base end frame 66 'is formed with the step portion 66 a'. However, as shown in fig. 68, a portion corresponding to the step portion 66a 'may not be formed in the base end frame 66'. In this case, the vertical position of the inner hook 93 'is higher than that of the above-described embodiment, and therefore the vertical position of the inner hook pin 94' may be higher than that of the above-described embodiment.

(3) In the above embodiment, if the switching plate 29a ' is in the open state (the state of the cutting position), the straw rack 50 ' may be raised after the switching plate 29a ' is switched to the closed state (the state of the non-cutting position). In addition, the state of the straw rack 50 'is not switched to the open state (the state of the cutting position) of the switching plate 29 a' when it is lifted

(4) In the above embodiment, the upper portion 118 ' is pushed up by the arm 121 ' in conjunction with the swinging of the straw rack 50 ' to the side of the raised position. However, instead of this, the upper portion 118 'may be swung to the open position side in conjunction with the swing of the straw holder 50' to the raised position side by an electric motor (not shown).

(5) In the above embodiment, the upper portion 118 'is provided in the notch portion 117 a'. However, instead of this, the rear upper cover 116 ' may be divided into two parts in the front-rear direction, and the front divided part of the rear upper cover 116 ' may be the upper part 118 '.

Industrial applicability

Claims

1. A combine harvester is provided with:

the conveying chain is used for clamping and conveying the cut rice straws;

the combine is characterized by comprising:

an upper cover that covers the threshing cylinder from above;

the second support shaft and the first support shaft are different shafts.

2. A combine harvester according to claim 1,

3. A combine harvester according to claim 1,

the upper frame and the straw frame can swing integrally.

4. A combine harvester according to claim 2,

the upper frame and the straw frame can swing integrally.

5. A combine harvester according to claim 3,

6. A combine harvester according to claim 4,

7. A combine harvester according to any one of the claims 1-6,

8. A combine harvester according to any one of claims 1 to 6,

the straw conveying space of the straw conveying device is formed to cross the straw rack in the front-back direction of the machine body, and is enlarged to be positioned at the left and right center sides of the machine body on the downstream side in the conveying direction in the front-back middle part of the straw conveying space in a plan view,

9. A combine harvester according to any one of the claims 1-6,

10. A combine harvester according to any one of claims 1 to 6,

the straw conveying device can be detached from the straw rack.

11. A combine harvester is provided with:

the conveying chain is used for clamping and conveying the cut rice straws;

the combine is characterized by comprising:

an upper portion of the rear upper cover located above a rear portion of the straw conveying device is vertically swingable between a closed position closing a straw conveying space of the straw conveying device and an open position opening the straw conveying space around a support shaft extending in a right-left direction of the machine body on a rear side of the upper portion,

12. A combine harvester according to claim 11,

the rear upper cover includes a main body having a cutout portion,

the upper portion is disposed within the cutout portion.

13. A combine harvester according to claim 11 or 12,

14. A combine harvester according to claim 13,

15. A combine harvester according to claim 11 or 12,

16. A combine harvester according to claim 15,