JP7018837B2 - combine - Google Patents

Description

The present invention relates to a combine provided with a threshing device for threshing a harvested grain culm and a waste straw cutting device connected to the rear of the threshing device to cut the waste straw after the threshing treatment.

As the waste wall cutting device in the above-mentioned combine, for example, as shown in Patent Document 1, a drive shaft (cutting shaft of Document 1) and a drive blade body having a plurality of cutting blades supported by the drive shaft (Reference 1). Rotating cutter), a cutting shaft parallel to the drive shaft (supply shaft of Document 1), and a receiving blade supported by the cutting shaft and having a plurality of receiving blades corresponding to the cutting blade (supply blade of Document 1). Some are provided with a body (rotational feeder of Document 1) and a case for accommodating a driving blade and a blade receiving body (cutter case of Document 1).

Japanese Unexamined Patent Publication No. 2010-99027

In the above-mentioned waste straw cutting device, mud adhering to the waste straw and dust such as cut straw adhere to the inner surface of the rear cover constituting the rear part of the case due to the cutting process of the waste straw. However, it may be necessary to perform cleaning to remove the adhering dust. Conventionally, in such a case, it is necessary to remove the rear cover or prepare a separate scraper or the like for cleaning work, which is troublesome. It also takes a lot of time.

The present invention provides a combine that can clean the rear cover without hassle.

The combine according to the present invention
A threshing device for threshing the harvested culm and a waste straw cutting device connected to the rear part of the threshing device to cut the waste straw after the threshing treatment are provided, and the waste straw cutting device includes a drive shaft and a drive shaft. A drive blade having a plurality of cutting blades supported by the drive shaft, a cutting shaft parallel to the drive shaft, and a plurality of receiving blades supported by the cutting shaft and corresponding to the cutting blade. The case is provided with a receiving blade, a case for accommodating the driving blade and the receiving blade, and the case is provided with a case main body and a rear cover constituting the rear portion of the case main body. The inside of the case is provided with a removing mechanism capable of removing dust adhering to the inner surface of the rear cover, and the removing mechanism is a member supported by the rear cover and capable of relative movement operation with respect to the surface to be removed. There is .

According to this configuration, dust adhering to the inner surface of the rear cover can be removed by a removal mechanism located inside the case, so there is no need to remove the rear cover or prepare a separate scraper, which saves time and effort. Can be cleaned without hanging.
According to this configuration, the removing mechanism can move along the surface to be removed to scrape off the dust, so that the dust can be easily removed.

In the present invention, it is preferable that the removal mechanism uses the lateral outer portion of the inner surface portion as the removal target surface.

The mud scatters from the stock source side of the discharged straw. In addition, the sorting wind discharged from the threshing device enters the case of the waste straw cutting device and flows, so that dust easily adheres to the lateral outer portion of the rear cover on the inner surface portion of the rear cover. According to this configuration, since the lateral outer portion of the inner surface of the rear cover is the removal target surface of the removal mechanism, the adhering dust can be accurately removed.

In the present invention, it is preferable that the removing mechanism is a plate member having a bent end portion that rises with respect to the surface to be removed, and the plate member is configured to scrape off dust by the bent end portion. Is.

According to this configuration, although the removal mechanism has a simple structure made of a plate member, the dust can be accurately removed because the dust can be scraped off while countering the strong removal reaction force by the bent end portion.

Another combine according to the present invention is
A threshing device for threshing the harvested grain sill and a waste wall cutting device connected to the rear of the threshing device to cut the waste waste after the threshing treatment are provided, and the waste waste cutting device includes a drive shaft and a drive shaft. A drive blade having a plurality of cutting blades supported by the drive shaft, a cutting shaft parallel to the drive shaft, and a plurality of receiving blades supported by the cutting shaft and corresponding to the cutting blade. The case is provided with a receiving blade, a case for accommodating the driving blade and the receiving blade, and the case is provided with a case main body and a rear cover constituting the rear portion of the case main body. The inside of the case is provided with a removing mechanism capable of removing dust adhering to the inner surface of the rear cover, and closes the opening formed in the rear cover having the target surface for dust removal and the opening. A lid member is provided, and the lid member is configured to be switchable between a closed state in which the rear cover is slidably contacted to close the opening and an open state in which the opening is opened. An edge portion of the opening and a switching mechanism for switching the state of the lid member between the closed state and the open state are provided, and dust adhering to the inner surface of the lid member collects dust on the rear cover of the lid member. It is scraped off by sliding.

According to this configuration, dust on the rear cover can be removed by a removal mechanism having a simple structure in which the edge of the opening is scraped off and used for the edge.

In the present invention, it is preferable that a locking mechanism for holding the lid member in the closed state is provided.

According to this configuration, the edge of the opening is scraped off and used for the edge, but the lid member can be held in the closed state by the lock mechanism, so that the opening is firmly closed so that shredded straw does not leak from the opening. You can shred the waste straw.

It is a left side view which shows the whole combine. It is a vertical sectional side view which shows the waste straw cutting apparatus. It is a rear view which shows the waste straw cutting apparatus. It is a front view which shows the removal mechanism. FIG. 4 is a cross-sectional view taken along the line VV of FIG. It is a rear view which shows the exhaust straw cutting apparatus provided with 1st Embodiment. It is a rear view which shows the exhaust straw cutting apparatus provided with 1st Embodiment. It is a rear view which shows the exhaust straw cutting apparatus provided with 2nd Embodiment. It is a rear view which shows the exhaust straw cutting apparatus provided with 3rd Embodiment.

Hereinafter, embodiments that are an example of the present invention will be described with reference to the drawings.
In the following description, regarding the combine aircraft, the direction of arrow F shown in FIG. 1 is "front of the aircraft", the direction of arrow B is "rear of the aircraft", the direction of arrow U is "upward of the aircraft", and arrow D. The direction is "downward of the aircraft", the direction of the front side of the paper is "left side of the aircraft", and the direction of the back side of the paper is "right side of the aircraft".

[About the overall composition of the combine]
As shown in FIG. 1, the combine includes an airframe frame 1 and an airframe having a pair of left and right crawler traveling devices 2 movably equipped under the airframe frame 1. The driving unit 3 is formed in the right region of the front portion of the airframe. The driver unit 3 is provided with a cabin 4 that covers the boarding space. A driving part having an engine 5 is formed below the driving part 3. A pre-cutting processing unit 6 for cutting and transporting grain culms such as paddy rice and wheat located in front of the machine during work running is connected to the left region in the front part of the machine frame 1. The pre-cutting processing unit 6 is connected in a state where it can move up and down with the pivot core P1 facing left and right of the machine as a fulcrum. The up-and-down swing of the pre-cutting unit 6 is performed by the expansion and contraction operation of the hydraulic elevating cylinder 8 erected over the machine frame 1 and the pre-processing unit frame 7. A threshing device 9 that receives a cut grain culm carried by the pre-cutting processing unit 6 in a portion of the machine frame 1 on the rear side of the pre-cutting processing unit 6 and threshs the processed material after the threshing treatment. Is provided. The threshing device 9 holds and transports the stock root side of the harvested culm supplied by the pre-cutting unit 6 toward the rear by a threshing feed chain (not shown), and handles the tip side of the harvested culm in a handling room (shown). Insert it into the culm and thresh it. A waste straw cutting device 10 for cutting the waste straw after the threshing process is connected to the rear part of the threshing device 9. Below the waste straw cutting device 10, there is provided a shredded straw discharging device 11 that diffuses the shredded straw discharged from the waste straw cutting device 10 in the lateral width direction of the machine body by the diffusion auger 11a and discharges the shredded straw to the field. A grain tank 12 for collecting and storing single grain grains conveyed from the threshing device 9 is provided in a portion of the machine frame 1 on the rear side of the operating unit 3. The threshing device 9 and the grain tank 12 are provided on the machine frame 1 in a state of being lined up in the width direction of the machine, so-called side by side. A grain discharging device 13 for discharging the stored grains is connected to the rear portion of the grain tank 12.

[About the configuration of the pre-cutting processing unit]
In the pre-harvesting processing unit 6, as the machine travels, the culm to be harvested among the planted culms is introduced into the raising device 6b by the divider 6a to be triggered and processed, and the planted culm is triggered and processed. The root of the stock is cut by a hair clipper type cutting device 6c, and the culm to be harvested is cut. The harvested culm is supplied to the starting end of the threshing feed chain of the threshing device 9 by the transport device 6d arranged behind the threshing device 6c.

[About the configuration of the waste straw cutting device]
As shown in FIG. 2, the waste straw cutting device 10 includes a case 15 provided at the rear of the threshing device 9. The case 15 is provided so as to be located below the transport end portion of the waste straw transport device 9a of the threshing device 9. An exhaust straw inlet 16 and a guide member 17 for guiding the exhaust straw falling from the exhaust straw transfer device 9a are provided on the upper part of the case 15. The driving blade 18 and the receiving blade 19 are housed inside the case 15.

As shown in FIG. 2, the guide member 17 is supported by the case 15 on the rear side of the exhaust straw inlet 16 so as to be vertically swingable, and has a lid function for opening and closing the exhaust straw inlet 16. When the posture of the guide member 17 is changed to a posture of standing up with respect to the upper surface portion of the case 15, the guide member 17 is in the first guide state in which the waste straw input port 16 is opened, and the guide member 17 guides the waste straw that falls from the waste straw transfer device 9a. Guided to flow into the inside of the case 15 from the exhaust straw inlet 16 by the back side surface of the case. When the posture of the guide member 17 is changed to a posture along the upper surface of the case 15, the guide member 17 is in the second guide state in which the waste straw input port 16 is closed, and the waste straw falling from the waste straw transfer device 9a is shown on the front of the guide member 17. The side surface guides the case 15 to the rear outside in a long straw state.

As shown in FIG. 2, the drive blade 18 has a drive shaft 18a rotatably supported on the left and right side walls of the case 15, and a plurality of cutting blades 18b rotatably supported by the drive shaft 18a. Have. The plurality of cutting blades 18b are arranged at intervals in the axis direction of the drive shaft 18a. The drive blade 18 is rotationally driven in the rotational direction indicated by the arrow X (see FIG. 2) by the power transmitted from the threshing device 9.

The blade 19 is rotatably supported on the left and right side walls of the case 15 in a state of being positioned parallel to the drive shaft 18a in front of the drive shaft 18a, and is unable to rotate relative to the cutting shaft 19a. It is supported and has a plurality of receiving blades 19b corresponding to the cutting blades 18b. The blade receiving body 19 is rotationally driven in the rotational direction indicated by the arrow Y (see FIG. 2) by the power transmitted from the threshing device 9.

In the waste straw cutting device 10, when the guide member 17 is switched to the first guide state, the waste straw that has fallen from the waste straw transport device 9a flows into the inside of the case 15 from the waste straw input port 16. The inflowing waste straw is placed on the driving blade 18 and the receiving blade 19, and is scraped between the driving shaft 18a and the cutting shaft 19a by the cutting blade 18b and the receiving blade 19b, while being scraped by the cutting blade 18b and the receiving blade 19b. It is cut and shredded to cut the discharged straw at multiple points in the direction of the blade. The shredded straw falls into the diffusion discharge case of the shredded straw discharge device 11 connected to the lower part of the case 15.

[About the configuration of the removal mechanism]
As shown in FIGS. 2 and 3, the case 15 is provided with a case main body 15A having a waste straw inlet 16 and a rear cover 15B constituting the rear part of the case main body 15A. The rear cover 15B is provided so as to close the drive blade 18 from the rear. Dust such as mud adhering to the waste straw, cut straw generated by the threshing process and cutting of the waste straw adheres to the inner surface of the rear cover 15B. Inside the case 15, a removing mechanism 20 capable of removing dust adhering to the inner surface portion of the rear cover 15B is provided.

The mud scatters from the stock source side of the discharged straw. Further, the sorting wind and dust discharged from the dust exhaust fan 9b (see FIG. 2) of the threshing device 9 pass through the inside of the case 15, so that the lateral outer portion of the machine body in the inner surface portion 15C of the rear cover 15B, that is, Dust is more likely to adhere to the portion of the rear cover 15B that is displaced toward the center where the threshing feed chain is located with respect to the center in the width direction of the machine body than the other portions. As shown in FIG. 3, the removal mechanism 20 is provided so that the lateral outer portion of the inner surface portion of the rear cover 15B is the surface to be removed.

Specifically, as shown in FIGS. 4 and 5, the removal mechanism 20 is composed of a strip-shaped plate member. Bent end portions 21 that stand up with respect to the surface to be removed are provided at both ends of the plate member in the lateral width direction. The removal mechanism 20 is rotatably supported by a portion of the rear cover 15B having a surface to be removed via a rotation support shaft 22. The operation handle 23 is attached to the end of the rotary support shaft 22 protruding toward the outer surface side of the rear cover 15B so that it cannot rotate relative to each other.

The removal mechanism 20 is operated with respect to the surface to be removed by rotating the operation handle 23 in the rotation direction (clockwise direction) indicated by the arrow A in FIG. 3 with the axis P2 of the rotation support shaft 22 as the rotation center. The operation handle 23 moves relative to the same rotation direction as the rotation direction. When the removal mechanism 20 is rotated in the rotation direction indicated by the arrow A, the removal mechanism 20 adheres to the surface to be removed by the first portion 21a and the second portion 21b shown in FIG. 4 of the bent end portions 21 of the plate member. Scrape off the dust that is being used.

In the removal mechanism 20, the operation handle 23 is rotated around the axis P2 of the rotary support shaft 22 in the rotation direction (counterclockwise direction) indicated by the arrow B in FIG. On the other hand, the operation handle 23 moves relative to the same rotation direction as the rotation direction. When the removal mechanism 20 is rotated in the rotation direction indicated by the arrow B, the removal mechanism 20 adheres to the surface to be removed by the third portion 21c and the fourth portion 21d shown in FIG. 4 of the bent end portions 21 of the plate member. Scrape off the dust that is being removed.

In the above-described embodiment, an example in which the removal mechanism 20 is composed of a plate member is shown, but the present invention is not limited to this. For example, a rod-shaped member having a rectangular cross section, an angle member, a flat plate member having no bent end, and the like can be adopted. Further, in the above-described embodiment, the plate member extends from the rotary support shaft 22 in two directions in opposite directions, but the present invention is not limited to this. For example, a configuration may be adopted in which the plate member, the rod-shaped member, or the like extend radially from the rotary support shaft 22 in a plurality of directions such as three directions and four directions. Further, a configuration may be adopted in which a plate member, a rod-shaped member, or the like extends from the rotary support shaft 22 in only one direction. Further, in the above-described embodiment, an example in which the bent end portions 21 are provided at both lateral end portions of the plate member is shown, but the bent end portions are provided only at one lateral end portion of the plate member. You may. Further, the removal mechanism 20 may be provided at a plurality of locations in the lateral width direction of the rear cover 15B. Further, the lateral end portion of the plate member may be provided with irregularities such as knurls or protrusions that make it easier for the plate member to scrape off the dust to enter the dust.

In the above-described embodiment, an example is shown in which the removal mechanism 20 provided in the case is configured to be rotatable in both the clockwise direction and the counterclockwise direction, but either the clockwise direction or the counterclockwise direction is shown. A configuration that can rotate only in the direction of rotation of the above may be adopted. Further, the configuration is not limited to the configuration in which the rear cover 15B moves relative to the rear cover 15B by rotation, and a configuration in which the rear cover 15B moves relative to the rear cover 15B may be adopted. In the above-described embodiment, the removal mechanism 20 is provided on the lateral outer portion of the inner surface portion of the rear cover 15B, but is not limited to this. For example, it may be provided in a part where dust easily adheres, such as a central part. Further, in the above-described embodiment, the removing mechanism 20 is provided only at one place on the inner surface portion, but it may be provided at a plurality of two or more places arranged in the lateral width direction of the waste straw cutting device 10.

[Another Embodiment]
(1) FIGS. 6 and 7 are rear views showing a waste straw cutting device 10 provided with the first embodiment.
As shown in FIGS. 6 and 7, in the waste straw cutting device 10 provided with the first embodiment, an opening 24 formed in a portion of the rear cover 15B having a surface to be removed and a lid for closing the opening 24 are provided. A member 25 is provided.

The corner portion of the lid member 25 is supported by the rear cover 15B via the pivot shaft 26. The rear cover 15B is supported by the rear cover 15B in a state where the swing operation can be performed with the pivot shaft 26 as a swing fulcrum. When the lid member 25 is oscillated and the lid member 25 is in a sideways posture as shown in FIG. 6, the lid member 25 is closed to close the opening 24. When the lid member 25 is swung to operate and the lid member 25 is in the upright posture as shown in FIG. 7, the lid member 25 is in an open state in which the opening 24 is opened.

When the lid member 25 is closed, as shown in FIG. 6, one side of the lid member 25 is received and supported by the positioning member 27 provided under the opening 24, and the lid member 25 is positioned. It is positioned in the closed state by the member 27. An opening / closing handle 28 for opening / closing the lid member 25 is provided at the free end portion of the lid member 25. The opening / closing handle 28 is supported by the lid member 25 in a state in which the posture can be changed between an upright use posture with respect to the lid member 25 and a retracted posture along the lid member 25. The lid member 25 is provided with a lock mechanism 29 that holds the lid member 25 in a closed state. The lock mechanism 29 is configured by using a catcher. The opening 24 can be firmly closed by the lid member 25 held in the closed state by the lock mechanism 29 so that the shredded straw does not leak from the opening 24. The lock mechanism 29 is supported by a support member 30 swingably connected to the lid member 25. When the lid member 25 is closed, the support member 30 is swung toward the lid member 25 so that the lock mechanism 29 enters the inside of the rear cover 15B through the through hole 25a (see FIG. 7) of the lid member 25. Then, the lock mechanism 29 is locked to the lock member 29a fixed to the rear cover 15B. Then, the lock mechanism 29 is locked, and the lid member 25 is held in the closed state by the lock mechanism 29.

The pivot shaft 26 and the open / close handle 28 constitute a switching mechanism 31 for switching the state of the lid member 25 between the closed state and the open state.

In the waste straw cutting device 10 provided with the first embodiment, the removing mechanism 20 is provided with an upper edge portion 24a in the opening 24 and a switching mechanism 31. In the removal mechanism 20, when the lid member 25 is state-switched by the switching mechanism 31, the edge portion 24a moves relative to the inner surface portion of the lid member 25 as the removal target surface, and moves to the inner surface portion of the lid member 25. Adhering dust is removed. As shown in FIG. 7, the edge portion 24a is provided with a protrusion 24c that promotes the ease of entry of the edge portion 24a into the dust for the edge portion 24a to scrape off the dust.

That is, when the lid member 25 is lifted and swung from the closed state to the open state by the switching mechanism 31, the inner surface portion of the lid member 25 slides with respect to the rear cover 15B, and this sliding causes the lid member 25 to slide. The inner surface portion moves with respect to the edge portion 24a, and the dust adhering to the inner surface portion of the lid member 25 is scraped off by the edge portion 24a.

In the first alternative embodiment, the lid member 25 is changed from the closed state to the open state by ascending and swinging, and the dust is scraped off by the upper edge portion 24a of the opening 24. A configuration may be adopted in which the lid member 25 is changed from the closed state to the open state by descending and swinging, and the dust is scraped off by the lower edge portion of the opening 24.

(2) FIG. 8 is a rear view showing the waste straw cutting device 10 provided with the second embodiment. As shown in FIG. 8, in the waste straw cutting device 10 provided with the second embodiment, the lid member 25 is placed on the upper and lower portions of the opening 24 in the rear cover 15B in the lateral width direction of the waste straw cutting device 10. A sideways guide rail 32 that supports the slide so that it can be opened and closed is provided. When the lid member 25 is closed, the lateral end portion of the lid member 25 is received by the positioning member 27a and is positioned in the closed state by the positioning member 27a. The lock mechanism 29 that holds the lid member 25 in the closed state has the same configuration as that of the lock mechanism 29 in the waste straw cutting device 10 having another first embodiment.

In the waste straw cutting device 10 provided with the second embodiment, a sideways guide rail 32 and an opening / closing handle 28 provided on the lid member 25 are provided on the switching mechanism 31 for switching the state of the lid member 25 between the closed state and the open state. The removal mechanism 20 is provided with a right lateral edge portion 24b of the opening 24 and a switching mechanism 31.

In the removal mechanism 20, when the lid member 25 is slid from the closed state to the right lateral side and switched to the open state by the switching mechanism 31, the edge portion 24b is relative to the inner surface portion of the lid member 25 as the removal target surface. It moves relative to each other, and dust adhering to the inner surface portion of the lid member 25 is removed. That is, the inner surface portion of the lid member 25 slides with respect to the rear cover 15B in the lateral width direction of the exhaust straw cutting device 10, and the inner surface portion of the lid member 25 moves with respect to the edge portion 24b due to this sliding, and the lid member 25. The dust adhering to the inner surface portion of the 25 is scraped off by the edge portion 24b.

In the second embodiment, the lid member 25 is moved from the closed state to the right lateral side to change the state to the open state, and the dust is scraped off by the edge portion 24b on the right lateral side of the opening 24. However, a configuration may be adopted in which the lid member 25 is moved from the closed state to the left lateral side to change the state to the open state, and the dust is scraped off by the left lateral edge of the opening 24.

When the lid member 25 is relatively moved with respect to the rear cover 15B by a horizontal slide, the width of the opening 24 may be widened, and the lid member 25 may be provided at two locations, the left side portion and the right side portion of the opening 24. .. When the left lid member 25 moves to the left side to open the opening 24, dust on the inner surface is scraped off at the left lateral edge of the opening 24, and the right lid member 25 moves to the right side to open the opening 24. Dust on the inner surface is scraped off at the right lateral edge of the opening 24 when the opening is opened.

(3) FIG. 9 is a rear view showing a waste straw cutting device 10 provided with a third embodiment. As shown in FIG. 9, in the waste straw cutting device 10 provided with another third embodiment, the lid member 25 is placed above and below the waste straw cutting device 10 on both side portions of the opening 24 in the rear cover 15B. A vertical guide rail 33 is provided to support the slide so that it can be opened and closed in the direction. When the lid member 25 is closed, the lower end of the lid member 25 is received by the positioning member 27b, and the lid member 25 is positioned in the closed state by the positioning member 27b. The lock mechanism 29 that holds the lid member 25 in the closed state has the same configuration as that of the lock mechanism 29 in the waste straw cutting device 10 having another first embodiment.

In the waste straw cutting device 10 provided with the third embodiment, the switching mechanism 31 for switching the state of the lid member 25 between the closed state and the open state, the vertical guide rail 33, and the opening / closing handle provided on the lid member 25 are provided. 28 is provided, and the removal mechanism 20 is provided with an upper edge portion 24a in the opening 24 and a switching mechanism 31.

In the removal mechanism 20, when the lid member 25 is switched from the closed state to the open state by the switching mechanism 31, the edge portion 24a moves relative to the inner surface portion of the lid member 25 as the surface to be removed, and the lid member 25 Dust adhering to the inner surface is removed. That is, the inner surface portion of the lid member 25 slides upward with respect to the rear cover 15B, and the inner surface portion of the lid member 25 moves with respect to the edge portion 24a due to this sliding, and the lid member 25. The dust adhering to the inner surface portion of the 25 is scraped off by the edge portion 24a.

In the third embodiment, the lid member 25 is changed from the closed state to the open state by sliding up, and the dust is scraped off by the upper edge 24a of the opening 24. A configuration may be adopted in which the member 25 is changed from the closed state to the open state by sliding downward, and the dust is scraped off by the lower edge portion of the opening 24.

When the lid member 25 is relatively moved with respect to the rear cover 15B by sliding up and down, the width of the opening 24 may be widened and two or more lid members 25 arranged in the horizontal direction may be provided.

The present invention can be applied to a combine in which the front-rear direction of the threshing device is set to the front-rear direction of the machine, and a combine in which the front-back direction of the threshing device is set to the side-to-side direction of the machine.

9 Threshing device 10 Waste waste cutting device 15 Case 15A Case body 15B Rear cover 18 Drive blade 18a Drive shaft 18b Cutting blade 19 Cutting blade 19a Cutting shaft 19b Blade 20 Removal mechanism 24 Opening 25 Lid member 29 Lock mechanism 31 Switching mechanism

Claims (5)

A threshing device that threshes the harvested culm,
A waste straw cutting device, which is connected to the rear part of the threshing device and cuts the waste straw after the threshing process, is provided.
The exhaust wall cutting device includes a drive shaft, a drive blade body having a plurality of cutting blades supported by the drive shaft, a cutting shaft parallel to the drive shaft, and the cutting shaft supported by the cutting shaft. A receiving blade having a plurality of receiving blades corresponding to the cutting blade, a driving blade, and a case for accommodating the receiving blade are provided.
The case is provided with a case body and a rear cover constituting the rear portion of the case body.
The inside of the case is provided with a removing mechanism capable of removing dust adhering to the inner surface of the rear cover .
The removal mechanism is a combine that is supported by the rear cover and can be moved relative to the surface to be removed . The removal mechanism is a plate member having a bent end portion that rises with respect to the surface to be removed.
The combine according to claim 1 , wherein the plate member is configured to scrape off dust by the bent end portion . A threshing device that threshes the harvested culm,
A waste straw cutting device, which is connected to the rear part of the threshing device and cuts the waste straw after the threshing process, is provided.
The exhaust wall cutting device includes a drive shaft, a drive blade body having a plurality of cutting blades supported by the drive shaft, a cutting shaft parallel to the drive shaft, and the cutting shaft supported by the cutting shaft. A receiving blade having a plurality of receiving blades corresponding to the cutting blade, a driving blade, and a case for accommodating the receiving blade are provided.
The case is provided with a case body and a rear cover constituting the rear portion of the case body.
The inside of the case is provided with a removing mechanism capable of removing dust adhering to the inner surface of the rear cover.
An opening formed in a portion of the rear cover having a target surface for dust removal and a lid member for closing the opening are provided.
The lid member is configured to be switchable between a closed state in which the lid member is slidably contacted with the rear cover to close the opening and an open state in which the opening is opened.
The removal mechanism is provided with an edge portion of the opening and a switching mechanism for switching the state of the lid member between the closed state and the open state.
A combine in which dust adhering to the inner surface of the lid member is scraped off by sliding the lid member with respect to the rear cover . The combine according to claim 3, further comprising a locking mechanism for holding the lid member in the closed state . The combine according to any one of claims 1 to 4, wherein the removal mechanism has a lateral outer portion of the airframe as a removal target surface .

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