CN113615406B - Combine harvester - Google Patents

Abstract

The invention provides a combine harvester capable of easily and efficiently cleaning and overhauling a receiving net. The combine harvester comprises a threshing machine (4), wherein the threshing machine (4) comprises a threshing part (30) for throwing the whole of the harvested straws into a threshing chamber (31) and threshing the straws by a threshing cylinder driven by a free rotation mode, and a screening part (40) for screening the threshing processed matters from the threshing chamber (31) through a screening device (42) capable of swinging, wherein the combine harvester comprises a pivot supporting mechanism (81) for supporting an upper transverse side wall part of the threshing chamber (31) forming the threshing machine (4) in a free swinging, opening and closing mode, and a loading and unloading mechanism (80) for supporting the upper transverse side wall part in a free loading and unloading mode.

Description

Combine harvester

The present application is a divisional application of the original application (application date: 2008, 7, 30, application number: 200810131191.X, invention name: combine), and the divisional application (application date: 2008, 7, 30, application number: 201810179857.2, invention name: combine).

Technical Field

The present invention relates to a combine harvester comprising a threshing machine provided with a threshing part for threshing by a threshing cylinder driven by a free rotation and a screening part for screening a threshing product from the threshing chamber by a screening device capable of swinging freely.

Background

As a harvester capable of opening a threshing chamber, there has been conventionally known a harvester described in, for example, japanese patent application laid-open No. 6-253657 (paragraph 0010, fig. 3 and 4) (hereinafter referred to as "patent document 1").

In the combine described in patent document 1, a top plate of a threshing chamber is attached to be openable and closable around a front-rear axis.

Although the threshing chamber can be opened by adopting the prior art, the cleaning and maintenance of the receiving net have problems.

That is, in the case where the threshing chamber is openable by the conventional technique, the threshing chamber can be opened to allow the hand or the cleaning tool to enter the threshing cylinder, but the hand or the cleaning tool cannot reach the receiving net, and therefore, the receiving net needs to be pulled out from the threshing chamber opening for cleaning and maintenance of the receiving net.

Disclosure of Invention

The invention aims to provide a combine harvester which can easily and efficiently clean and overhaul a receiving net.

The present invention is characterized in that the combine harvester comprises a threshing machine comprising a threshing part for threshing by a threshing cylinder driven by a free rotation to throw the whole of the harvested straw into a threshing chamber, and a screening part for screening the threshing processed object from the threshing chamber by a screening device capable of swinging freely, wherein the combine harvester comprises a pivot supporting mechanism for supporting the upper lateral side wall part of the threshing chamber forming the thresher in a free swinging and opening/closing mode, and a loading and unloading mechanism for supporting the upper lateral side wall part in a free loading and unloading mode.

According to this configuration, the lateral side wall portion is opened by swinging or removed, so that the lateral side portion of the threshing chamber can be opened with the receiving net facing the opening, and cleaning and maintenance can be performed while the receiving net is still attached to the threshing chamber.

In addition, depending on the scale of cleaning and maintenance, the tool, etc., may be swung open without detaching the upper lateral side wall, and the upper lateral side wall may be detached to prevent the upper lateral side wall from being an obstacle, thereby facilitating the work.

Therefore, the cleaning and maintenance operations of the receiving net can be easily and efficiently performed without taking the receiving net out of the threshing chamber. In addition, the upper lateral side wall portion may be removed to prevent it from becoming an obstacle, as the case may be, and thus the work can be performed efficiently.

In the above-described configuration, it is preferable that a grain sieve loading/unloading window for loading and unloading the grain sieve of the sieving device is provided in a lower lateral wall portion of the sieving portion of the thresher.

According to this structure, the cereal sieve can be taken out and put in through the cereal sieve loading and unloading window to be replaced.

Therefore, when the type of the harvested grains is changed, the grain sieve can be replaced with a grain sieve having a different mesh, and the appropriate screening process can be easily performed without performing a work of removing the entire swing screening apparatus from the screening unit.

In the above-described structure, it is preferable that the threshing machine further comprises a pivot mechanism for supporting a ceiling plate forming the threshing chamber of the threshing machine so as to be capable of swinging and opening and closing.

According to this structure, by swinging the open top plate, the upper part of the threshing chamber can be opened, and the receiving net can be taken out from the threshing chamber.

Therefore, when the type of grain to be harvested is changed, the receiving net can be replaced with a receiving net having a different mesh, and appropriate threshing can be performed.

In the above-described structure, it is preferable that the threshing device further comprises a dust-feeding valve connected to an inner surface side of a ceiling plate forming the threshing chamber of the threshing machine in a direction of a rotation axis of the threshing cylinder, and a reinforcing plate connected to an outer surface side of the ceiling plate so as to be fastened together with the plurality of dust-feeding valves.

According to this structure, the supporting strength can be improved by the reinforcing plate, so that the dust valve can be firmly supported by the top plate.

Therefore, even if a large reaction force from the threshing processed object acts on the dust-sending valve, the dust-sending valve can be firmly supported by the top plate, and the threshing processed object can be guided by the dust-sending valve with high precision. Further, the structure can be realized simply by providing the reinforcing plate, and the structure can be obtained at a low cost as compared with the structure in which the top plate is formed by using a thick plate.

In the above-described structure, it is preferable that a freely rotatably driven rotary drum for raking up the upright straw to the harvesting device is provided in the harvesting section, and the bending strength of the end-side teeth located on the lateral end side of the rotary drum is set to be greater than the bending strength of the inner teeth located on the inner side of the rotary drum among the teeth provided on the rotary drum so as to be aligned in the rotation axis direction of the rotary drum.

Conventionally, there is a structure in which all teeth aligned in the rotation axis direction of a rotary drum have the same bending strength, but in a combine employing a technology related to a conventional rotary drum, threshing or raking may be insufficient.

That is, on the lateral end side of the rotary drum in the rotary shaft center direction of the rotary drum, upright straw of the uncut land may be entangled and enter the harvester together with the straw to be harvested. If the bending strength of the end teeth located on the lateral end side of the rotary drum is small, the end teeth deform due to a strong reaction force from the straw, and the problem of poor raking of the straw by the end teeth occurs. Therefore, in order to make the raking failure of the end-side teeth difficult to occur, it is necessary to increase the bending strength of the end-side teeth so that the end-side teeth are strongly raked. In this way, the bending strength of the inner teeth located inside the rotation drum in the rotation drum rotation axis direction of the rotation drum also increases. In practice, the inner teeth act on the upright straw without the unharvested land, and do not receive as much reaction force as the end teeth, but nonetheless exert a strong raking action on the straw that does not cause deflection due to the reaction force. As a result, threshing is likely to occur inside the rotating drum, depending on the type of straw.

Therefore, by adopting the present structure, the end teeth for raking up upright straw at the lateral end side of the rotary drum have a greater bending strength than the inner teeth, and even if the reaction force from straw is large, deformation is less likely to occur, and a strong raking up action can be performed.

On the other hand, the inner teeth that rake up the upright straw inside the rotary drum have a smaller bending strength than the end teeth, and thus, when receiving a large reaction force from the straw, the inner teeth are easily bent and gently rake up the straw.

Therefore, the straw can be raked up to the harvesting device by the rotary drum in a good state that the raking up is difficult to be insufficient or threshing is difficult to occur, the straw can be smoothly flowed to operate efficiently, and the grain loss can be prevented.

In the above-described configuration, the inner teeth are preferably formed such that the distal end sides of the inner teeth are closer to the outer circumference of the rotary drum than the distal end sides of the end teeth.

According to this configuration, even if the inner teeth are grounded by the rotating drum being lowered to act at a position as close to the ground as possible, the end side teeth are grounded easily because the end side of the inner teeth is closer to the outer peripheral side of the rotating drum than the end side of the end side teeth. The inner teeth have smaller bending strength than the end teeth, so that the inner teeth are more easily elastically deformed due to grounding, and are difficult to deform or break.

Therefore, even if the rotary drum excessively descends to generate grounding, deformation or breakage due to grounding of the inner teeth or the end teeth is difficult to generate, and the combine harvester with excellent durability can be obtained.

In the above configuration, the extension length of the end side teeth from the tooth support portion is preferably set shorter than the extension length of the inner side teeth from the tooth support portion.

According to this configuration, even if the rotary drum is lowered to act at a position as close to the ground as possible to cause the inner teeth to be grounded, the end-side teeth are easily prevented from being grounded because the extension length of the end-side teeth extending from the tooth support portion is shorter than the extension length of the inner teeth extending from the tooth support portion. The inner teeth have smaller bending strength than the end teeth, so that the inner teeth are more easily elastically deformed due to grounding, and are difficult to deform or break.

Therefore, even if the rotary drum excessively descends to generate grounding, deformation or breakage due to grounding of the inner teeth or the end teeth is difficult to generate, and the combine harvester with excellent durability can be obtained.

In the above configuration, it is preferable that, of the pair of tooth supporting portions adjacent to each other in the rotational direction of the rotational drum, the inner tooth group having the plurality of inner teeth supported by one tooth supporting portion and the inner tooth group having the plurality of inner teeth supported by the other tooth supporting portion are arranged so as to be shifted from each other in the rotational axis direction of the rotational drum.

According to this configuration, since the number of inner teeth included in the rotary drum can be reduced by setting the mounting intervals of the inner teeth on each tooth support portion to be large, the straw can be raked with high accuracy by the rotary drum while being obtained at low cost in terms of the number of inner teeth to be mounted.

That is, the inner teeth on one tooth support portion are arranged between each other and the inner teeth on the other tooth support portion in the circumferential direction of the rotary drum. As a result, the interval between the inner teeth of the tooth support portions can be set to be large, and the number of inner teeth provided on the tooth support portions can be reduced, so that even if there are upright straws which are positioned between the inner teeth of the tooth support portions that reach the lower side of the rotary drum and are not caught by the inner teeth positioned on the tooth support portions, the inner teeth of the tooth support portions that reach next can be caught by the upright straws and raked up in the harvesting device.

Drawings

FIG. 1 is a left side view of the combine harvester as a whole;

FIG. 2 is a right side view of the combine harvester as a whole;

FIG. 3 is a top view of the combine harvester as a whole;

FIG. 4 is a longitudinal cross-sectional side view of the thresher;

FIG. 5 is a front cross-sectional view of the thresher;

FIG. 6 is a longitudinal cross-sectional rear view of the secondary feed back device;

FIG. 7 is a side view of the secondary feed back device;

fig. 8 is a perspective view of the upper lateral side wall portion in an opened state;

fig. 9 (a) is a plan view in a state where the upper lateral side wall portion is closed, and fig. 9 (B) is a plan view in a swing open state of the upper lateral side wall portion;

FIG. 10 is a side view of the loading mechanism and pivoting mechanism;

FIG. 11 is a rear view of the loading mechanism and the pivoting mechanism;

FIG. 12 is a top view of the locking mechanism;

FIG. 13 is a front view of the locking mechanism;

FIG. 14 is a side view of a grain sieve loading and unloading window assembly of the outboard lateral side wall;

FIG. 15 is a top view of the top plate;

FIG. 16 is a cross-sectional view of the reinforcement panel assembly of the top panel;

fig. 17 is a left side view of the whole combine harvester of the second embodiment;

fig. 18 is a right side view of the entirety of the combine harvester of the second embodiment;

fig. 19 is a top view of the whole combine harvester of the second embodiment;

FIG. 20 is a side view of the rotary drum assembly of the harvesting portion;

FIG. 21 is a side view of the rotating spool;

FIG. 22 is a top view of the rotating drum;

fig. 23 is a front view of one lateral end side of the rotary drum;

fig. 24 is a front view of the other lateral end side of the rotary drum;

Fig. 25 is a side view in a lowered operation state of the low position side of the rotary drum;

fig. 26 is a side view in a lowered operation state of the high position side of the rotary drum;

fig. 27 is a side view in a lowered operation state of the low position side of the rotary drum;

FIG. 28 is a side view of the tooth support;

FIG. 29 is a top view of a portion of a screw feeder;

FIG. 30 is a side view of a seat support structure;

FIG. 31 is a top view of a seat support structure;

FIG. 32 is a front view of a seat support structure;

fig. 33 is a side view at a tooth support of a rotary drum having a second embodiment.

Detailed Description

First embodiment

A first embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a left side view of the whole combine harvester according to the first embodiment of the invention. Fig. 2 is a right side view of the overall combine harvester according to an embodiment of the invention. Fig. 3 is a top view of the whole combine harvester according to the embodiment of the invention. As shown in these figures, the combine harvester according to the embodiment of the present invention has: a traveling machine body that is self-propelled by a pair of left and right crawler traveling devices 1, 1 and has a driver section 2 to which a driver seat 2a is attached; a threshing machine 4 mounted on the rear side of the machine frame 3 of the traveling machine; a grain bagging unit 10 equipped with a bagging box 11 provided at a lateral side of the thresher 4; and a harvesting part 20 connected with a feeding device 21 at the front part of the threshing machine 4.

The combine harvester is used for harvesting rice, wheat and the like.

That is, the harvesting unit 20 includes, in addition to the feeding device 21, the following components: a harvester frame 22 connected to the front end of the feeding device 21; crop dividers 23 provided on both lateral sides of the front end portion of the harvester frame 22; a clipper-shaped harvesting device 24 provided on the front end portion of the frame 22a of the harvester frame 22 so as to be capable of driving the harvester frame 22; a screw feeder 25 rotatably and drivingly disposed on the upper surface side of the frame 22a on the harvester frame 22; and a rotary drum 27, wherein the rotary drum 27 is rotatably supported by a pair of left and right support arms 26, which extend forward from the upper part of the base end side of the harvester frame 22.

The feeding device 21 is vertically swung about a lifting axis P extending transversely to the machine body with respect to the threshing machine 4 by the hydraulic cylinder 28, whereby the harvesting unit 20 is lifted up and down to a lowered operation state in which the stand portion 22a of the harvesting frame 22 is lowered to the vicinity of the ground, and a raised non-operation state in which the harvesting frame 22 is raised greatly from the ground. When the traveling machine body is driven in the lowered operation state of the harvesting portion 20, the harvesting portion 20 performs harvesting processing for harvesting upright straw and processing for supplying the harvested straw to the threshing machine 4.

That is, upright straw is separated into a harvesting object and a non-harvesting object by the pair of left and right crop dividers 23, and then harvested by the harvesting device 24 while the upright straw as the harvesting object is raked up to the harvesting device 24 by the rotary drum 27. The harvested straw is transported laterally along the stand portion 22a to the front of the feeder 21 by the screw plates 25a at both end sides of the screw feeder 25. The harvested straw reaching the front of the feeder 21 is fed into the inlet of the feeder 21 located at the rear side of the screw feeder 25 by the gathering of a conveying arm 25b provided integrally rotatably in the middle of the screw feeder 25. The harvested straw fed into the feeder 21 is then conveyed to the rear via the interior of the feeder 21 by means of a conveyor 29 located inside the feeder 21. By the gathering action of the conveyor 29, the whole of the harvested straw reaching the rear end of the feeder 21 from the roots to the tips of the ears is thrown into the front end of the threshing chamber 31 (see fig. 4) of the threshing machine 4.

Fig. 4 is a longitudinal cross-sectional side view of the threshing machine 4. Fig. 5 is a front cross-sectional view of the threshing machine. As shown in these drawings, the threshing machine 4 includes: a threshing part 30 with the threshing chamber 31 and a screening part 40 with a screening chamber 41 below the threshing chamber 30.

The threshing unit 30 includes, in addition to the threshing chamber 31, the following components: a threshing cylinder 32 rotatably and drivingly provided in the threshing chamber 31 around a threshing cylinder rotation axis 32a facing the front and rear of the machine body; a receiving net 33 disposed in the threshing chamber 31 along the periphery of the lower portion side of the threshing cylinder 32; the plurality of dust feed valves 35 are disposed on the inner surface side of the ceiling 34 of the threshing chamber 31 in a direction along the rotation axis 32a of the threshing cylinder.

The threshing unit 30 performs threshing as follows.

That is, the harvesting stalks input into the front end portion of the threshing chamber 31 are sent to the threshing processing portion of the threshing cylinder 32 having the threshing teeth 32c by the helical plate-shaped raking teeth 32b provided integrally rotatably at the front end portion of the threshing cylinder 32. The harvested straw fed to the threshing section is subjected to threshing treatment by the round bar-shaped threshing teeth 32c and the receiving net 33 which are arranged in the circumferential direction and the front-rear direction of the threshing cylinder 32. At this time, the straw chips and the like flow rearward of the threshing chamber 31 by the transfer function of the rotation of the threshing cylinder 32 and the flow guide function of each dust feed valve 35. The threshed grains fall down through the receiving net 33 into the screening device 42 of the screening unit 40, and dust such as straw chips is discharged from the dust feed port 36 located at the rear end of the threshing chamber 31.

The screening unit 40 includes a windmill 43 provided below the front end portion of the screening device 42, in addition to the screening chamber 41 and the screening device 42; a primary screw conveyor 44 and a secondary screw conveyor 45 provided at the bottom of the screening chamber 41.

The screening device 42 includes: a screen box 50 linked to a screen drive mechanism 46 located at the rear end portion of the screen chamber 41; an upper cereal tray 51, a chaff sieve 52 and a straw walker 53 which are arranged in a front-rear direction of the sieve box at an upper portion of the inner side of the sieve box 50; a lower cereal tray 54 and a cereal sieve 55 are arranged in a row in the front-rear direction of the sieve box at the bottom of the sieve box 50.

The screening device 42 includes a screening adjustment plate 56 detachably provided at the front end of the chaff screen 52. The screening adjustment plate 56 is used in the following manner when a large amount of dust such as stalk dust is mixed in the threshing processed product that falls from the receiving net 33 onto the upper cereal tray 51: below the screen line 57 extending from the rear end of the upper cereal tray 51, the treated matter falling hole of the chaff screen 52 is closed.

The screening unit 40 performs screening of the threshing processed product by driving the screening device 42 to swing by the screening driving mechanism 46, and supplying screening wind in the front-rear direction of the threshing machine by the windmill 43 so as to pass through the chaff screen 52, the straw walker 53, and the grain screen 55.

That is, the threshing processed product falling from the receiving net 33 is received by the screening device 42, and the single grain as the first-stage processed product, the mixture of the grain with the branch and the stalk, the stalk and the dust as the third-stage processed product, and the dust as the third-stage processed product are screened by the swing screening performed by the upper grain tray 51, the chaff screen 52, the stalk-sorting device 53, the lower grain tray 54, and the grain screen 55, and the wind screening performed by the screening wind. The primary treated matter is dropped onto the primary screw conveyor 44, and is conveyed to the lateral outside of the threshing machine body by the primary screw conveyor 44. The secondary treatment product is dropped onto the secondary screw conveyor 45, and is conveyed to the lateral outside of the threshing machine body by the secondary screw conveyor 45. The three-stage processed matters are discharged to the rear outside of the threshing machine body from a dust discharge port 47 located at the rear of the threshing machine body together with the threshing processed matters from the dust feed port 36 of the threshing chamber 31 by the screening wind.

The dust discharge port 47 has a dust discharge hood 48 for guiding the discharged dust downward so as not to spread to the rear of the threshing machine.

As shown in fig. 2, the grain bagging unit 10 includes a bag support unit that supports an upper end side of the grain bag mounted on the discharge tube 12 by a bag support rod 13 and supports a lower end side of the grain bag by a bag receiving table 14, in addition to the bagging box 11. Wherein the discharge tube 12 is positioned at the lower part of the bagging case 11.

The bagging box 11 supplies and stores dehulled grains from the primary screw conveyor 44 by the grain lifting device 15 (see fig. 3), and discharges the stored dehulled grains from the discharge cylinder 12 into grain bags.

As shown in fig. 3, the threshing machine 4 has a secondary feeding back device 60 provided on the lateral outside of the threshing machine body. Fig. 6 is a longitudinal cross-sectional rear view of the above-described secondary feed back device 60. Fig. 7 is a side view of the secondary feed back device 60. As shown in these figures, the secondary feed back device 60 has: a processing box 62 connected to the inlet 61 at a conveying end of the secondary screw conveyor 45; two processing blades 63 provided in the processing box 62 so as to be integrally and rotatably connected to the screw shaft of the secondary screw conveyor 45; a winnowing drum 64 whose lower end side is connected to the discharge port of the treatment tank 62; a thresher screw 65 rotatably provided in the thresher drum 64; a transmission box 66 provided across the lateral side of the treatment box 62 and the lower end of the thresher drum 64.

The secondary feeding back device 60 rotationally drives the processing blade 63 by the secondary screw conveyor 45, transmits the driving force of the secondary screw conveyor 45 to the lower end portion of the winnowing screw 65 by the transmission chain 67 accommodated in the transmission case 66, drives the winnowing screw 65, performs the singulation process on the secondary processed product from the screening unit 40, and then performs the re-screening process in the screening device 42.

That is, the processed material from the secondary screw conveyor 45 is introduced into the processing box 62 by the conveying force of the secondary screw conveyor 45. The grain with the stems mixed in the secondary treatment substance having entered the treatment tank 62 is treated by the striking action of the treatment blade 63 and is individualized. The treated grains and the treated material such as straw chips are sent to the thresher drum 64 by the rotating treating blade 63. The processed matter introduced into the basket 64 is pumped by the basket screw 65 to the upper end portion of the basket 64. The processed material reaching the upper end of the thresher drum 64 is fed to a return port 69 provided in the lateral side wall of the thresher 4 by the throwing action of a rotary blade 68 integrally rotatably attached to the screw shaft of the thresher screw 65, and is dropped from the return port 69 to the screening chamber 41 through between the lateral side wall of the threshing chamber 31 and the threshing cylinder 32, and is thereby supplied to the front end of the screening device 42.

The processing box 62 includes: a box body 62a bolted to a lateral side wall 70 (hereinafter referred to as an inner lateral side wall 70) located on the lateral inner side of the traveling machine body of the threshing machine 4; a side plate 62c detachably connected to the opposite side of the case body 62a from the inlet 61 by a connecting bolt 62 b.

That is, the interior of the process tank 62 is opened by removing the side plate 62c, so that the inspection and cleaning of the interior of the process tank can be performed even in a state in which the tank main body 62a is still attached to the above-described inner lateral side wall 70. The transmission case 66 is detachably connected to the screw shaft of the secondary screw conveyor 45 and the input shaft 65a of the winnowing screw 65, and the transmission case 66 can be detached together with the side plate 62c in a state of being attached to the side plate 62 c.

As shown in fig. 1, the threshing machine 4 includes an upper front cover 72, an upper rear cover 73, a lower front cover 74, and a lower rear cover 75 provided on the outer surface side of a lateral side wall 71 (hereinafter referred to as an outer lateral side wall 71, see fig. 5) located on the lateral outer side of the traveling machine body.

The upper front cover 72, the lower front cover 74, and the lower rear cover 75 cover a belt transmission mechanism 76 (see fig. 14) provided on the outer surface side of the outer lateral side wall 71. The belt transmission mechanism 76 transmits the driving force from the engine 5 (see fig. 2) located below the driver seat 2a to the threshing cylinder 32, the windmill 43, the primary screw conveyor 44, the secondary screw conveyor 45, and the screening driving mechanism 46.

The upper front cover 72, the lower front cover 74, and the lower rear cover 75 are supported on the outer lateral side wall 71 by a loading/unloading mechanism (not shown) provided across the covers 72, 74, 75 and the outer lateral side wall 71. The above-described attaching/detaching mechanism of each of the covers 72, 74, 75 is configured by a hook (not shown), and the operation member 77 provided on the covers 72, 74, 75 swings the operation hook to the detachment side, thereby releasing the connection of the covers 72, 74, 75 to the outer lateral side wall 71.

The covers 72, 74, 75 may be detachably connected by connecting bolts.

As shown in fig. 8, of the outer lateral side walls 71 of the threshing machine 4, an upper lateral side wall portion 71a forming the threshing chamber 31 and a lower lateral side wall portion 71b forming the screening portion 40 are formed as separate bodies, and the upper lateral side wall portion 71a is supported on the inner surface side of the upper rear cover 73. A loading and unloading mechanism 80 and a pivot mechanism 81 are provided so as to straddle the rear end portion of the upper rear cover 73 and the body frame 78 of the threshing machine 4.

Fig. 10 is a side view of the loading and unloading mechanism 80 and the pivoting mechanism 81. Fig. 11 is a rear view of the loading and unloading mechanism 80 and the pivoting mechanism 81. As shown in these drawings, the loading and unloading mechanism 80 and the pivoting mechanism 81 include: a pair of upper and lower pivot shafts 83, 83 provided by attaching a pair of upper and lower support bodies 82, 82 to the body frame 78; a pair of upper and lower connection holes 85, 85 provided to connect the pair of upper and lower connection plates 84, 84 to the inner surface side of the upper and rear cover 73.

The upper and lower pair of connection plates 84, 84 are respectively fitted to the upper and lower pair of pivot shafts 83, 83 from above by the upper and lower pair of connection holes 85, and the upper surfaces of the upper and lower pair of supporting bodies 82, 82 are respectively supported and supported by the connection plates 84 from below, and by setting the state, the loading and unloading mechanism 80 connects the upper rear cover 73 to the machine frame 78, whereby the state in which the upper lateral side wall portion 71a is connected to the machine frame 78 is obtained. The pivot mechanism 81 is pivotally supported so that the upper lateral side wall portion 71a swings and opens together with the upper rear cover 73 about an opening and closing axis X toward the upper and lower sides of the threshing machine body, the opening and closing axis X being the axis of the pair of upper and lower pivot shafts 83, 83 and being located on the rear end side of the upper lateral side wall portion 71 a.

The attachment/detachment mechanism 80 releases the connection of the upper rear cover 73 to the body frame 78 by pulling out the pair of upper and lower connection plates 84, 84 from the pivot shaft 83, thereby releasing the connection of the upper lateral side wall portion 71a to the body frame 78.

Fig. 9 (a) is a plan view in a state where the upper lateral side wall portion 71a is closed. As shown in the figure, the upper rear cover 73 is connected to the machine frame 78 by a loading/unloading mechanism 80, and is closed in a state of being aligned with the upper front cover 72 in the front-rear direction of the traveling machine body in the mounted state. In this way, the upper lateral side wall portion 71a closes the threshing chamber lateral opening 86 located in the outer lateral side wall 71. At this time, the upper rear cover 73 is fixed in the closed state by the locking mechanism 87 provided straddling the front end portion of the upper rear cover 73 and the outer lateral side wall 71, whereby the upper lateral side wall portion 71a can be fixed in the closed state.

Fig. 12 is a plan view of the lock mechanism 87. Fig. 13 is a front view of the lock mechanism 87. As shown in these figures, the lock mechanism 87 includes: a lock lever 87a provided on the outer surface side of the outer lateral side wall 71; a pair of hooks 87b, 87b configured to be engaged with and disengaged from the lock lever 87a and provided on the back surface side of the front end portion of the upper rear cover 73; and an operating element 88 provided on the front surface side of the upper rear cover 73 for performing the swing canceling operation on the pair of hooks 87b, 87 b.

Instead of the lock mechanism 87, a structure may be adopted in which the upper rear cover 73 is closed and fixed by a connecting bolt, so that the upper lateral side wall portion 71b is closed and locked.

The upper lateral side wall portion 71a shown by a solid line in fig. 8 is an upper lateral side wall portion in a swing-open state. The upper lateral side wall portion 71a shown by a two-dot chain line in fig. 8 is an upper lateral side wall portion in a detached open state. Fig. 9 (B) is a plan view of the upper lateral side wall portion 71a in a swing-open state. As shown in these drawings, the upper rear cover 73 in a state where the lock mechanism 87 has been switched to the unlock state swings open to the outside in the lateral direction of the traveling machine body around the opening/closing axis X. In this way, the upper lateral side wall portion 71a swings laterally outward of the traveling machine body together with the upper rear cover 73, and is brought into a swing-open state. Alternatively, the upper rear cover 73 is lifted up from the support 82, and the pair of upper and lower connection plates 84, 84 are pulled out from the pivot shaft 83, whereby the connection of the upper rear cover 73 to the body frame 78 by the attachment/detachment mechanism 80 is released. In this way, the upper lateral side wall portion 71a is detached from the body frame 78 together with the upper rear cover 73, and is opened in a detached state. In any case, the threshing machine body can be inspected and cleaned from the lateral outside thereof while the receiving net 33 is still attached to the threshing machine body 31 by opening the threshing machine body lateral opening 86.

As shown in fig. 9 (B), the other end side of the lock lever 89 supported by the lower link plate 84 so as to be rotatable and liftable in a state where the upper lateral wall portion 71a is opened by swinging is fitted into the lock lever hole 82a provided in the support body 82. In this way, the lock lever 89 abuts and supports the upper rear cover 73 in the opened state, whereby the upper lateral side wall portion 71a can be fixed in the opened state.

As shown in fig. 5 and 14, the threshing machine 4 includes: a grain sieve loading/unloading window 90 provided on a lower lateral side wall portion 71b forming the sieving section 40 of the outer lateral side wall 71 and a lower lateral side wall portion 70b forming the sieving section 40 of the inner lateral side wall 70; and a cover 91 for the cereal screening window 90. The grain sieve attachment/detachment window 90 of the outer lateral wall portion 71 is disposed so as to be covered by the lower rear cover 75. The grain sieve attachment/detachment window 90 of the inner lateral wall portion 70b is located below the bagging case 11.

The cover 91 is attached to and detached from the lower lateral side wall portions 70b and 71b by means of an engaging portion 92 provided to the lower lateral side wall portions 70b and 71b so as to be capable of being engaged with and disengaged from the lower end portion of the cover 91, and a pair of connecting bolts 93 and 93 attached to the upper end portion of the cover 91, whereby the grain sieve attaching and detaching window 90 is opened and closed.

That is, when the harvested crop type is changed, the grain sieve 55 is replaced with a grain sieve provided with a treated object falling hole of an appropriate size. The replacement is performed according to the following claims.

That is, the lower back cover 75 and the lid 91 located behind the lower back cover 75 are removed, the grain sieve attachment/detachment window 90 of the outer lateral side wall 71 is opened, and the connection or disconnection between the one end side of the grain sieve 55 and the sieve box 50 by the connecting bolt is performed from the grain sieve attachment/detachment window 90. The lid 91 located below the bagging box 11 is removed, and the grain sieve attachment/detachment window 90 of the inner lateral side wall 70 is opened, and the other end side of the grain sieve 55 and the sieve box 50 are connected or disconnected by a connecting bolt from the grain attachment/detachment window 90. The grain sieve 55 is put into and taken out of the sieving chamber 41 through the grain sieve loading/unloading window 90 of the outer lateral side wall 71 or the inner lateral side wall 70.

As shown in fig. 5 and 15, the top plate 34 is connected to the frame 95 via three pivot mechanisms 94 arranged in the front-rear direction of the traveling machine body at the end portion of the top plate 34 on the outer side in the traveling machine body lateral direction.

That is, the top plate 34 swings downward with respect to the body frame 95 about the opening/closing axis Y in the front-rear direction of the traveling body provided in the connecting pin 94a of each pivot mechanism 94, and the free end 34a of the top plate 34 is brought into a closed position in contact with the body frame 96, thereby closing the threshing chamber upper opening 97. At this time, the roof 34 can be fixed in the closed posture by applying three locking pieces 98 provided at the free end portion of the roof 34 in the front-rear direction of the traveling machine body to the machine body frame 96.

By swinging the top plate 34 upward about the opening/closing axis Y with respect to the machine frame 95, the threshing chamber upper opening 97 can be opened, the threshing cylinder 32 can be inspected and cleaned through the threshing chamber upper opening 97, and the receiving net 33 can be pulled out of the threshing chamber 31 through the threshing chamber upper opening 97. The receiving net 33 is separated into two separate receiving nets along the circumferential direction of the threshing cylinder and pulled out.

As shown in fig. 15, the top plate 34 has reinforcing plates 100 provided at both ends in the lateral direction of the traveling machine body on the outer surface side thereof. As shown in fig. 15 and 16, the reinforcing plates 100 are connected to the top plate 34 by connecting bolts 101 at positions corresponding to the end portions of the three dust-sending valves 35 located in front of the threshing chamber in the plurality of dust-sending valves 35, so as to be fastened together with the dust-sending valves 35.

That is, since more objects to be treated such as grains and straw chips are present in the front part of the threshing cylinder 31 than in the rear part, the dust valve 35 located in the front part of the threshing chamber 31 receives stronger reaction force than the dust valve 35 located in the rear part of the threshing chamber 31. Accordingly, each reinforcing plate 100 enhances the supporting strength to firmly support the dust valve 35 by the top plate 34.

As shown in fig. 4, the screening device 42 is detachably connected to the support frame 102 via a loading/unloading mechanism 103 provided across the rear end side of the screen box 50 and the support frame 102 that is linked to the screen drive mechanism 46.

That is, the dust-discharging cover 48 is detached from the threshing machine body, the dust-discharging opening 47 is opened, a hand is inserted into the screening chamber 41 from the dust-discharging opening 47, the connection of the screen box 50 to the supporting frame 102 by the attaching/detaching mechanism 103 is released, and the screening device 42 is moved to the rear side of the threshing machine body. In this way, the screening box 50 is slidably guided by the pair of left and right guide rails 104, 104 provided on the support frame 102, and the screening device 42 is moved toward the dust discharge port 47 through the threshing chamber, so that the whole screening device 42 can be pulled out of the machine body from the dust discharge port 47 by an easy removal operation.

Instead of the upper lateral wall 71b of the above embodiment, a structure may be employed in which the upper lateral wall is opened and closed by swinging around an axis located on the front end side of the upper lateral wall and directed in the up-down direction of the threshing machine body, or a structure in which the upper lateral wall is opened and closed by swinging around an axis located on the upper end side of the upper lateral wall and directed in the front-back direction of the threshing machine body. The object of the invention is achieved in all these cases.

Second embodiment

A second embodiment of the present invention is described below with reference to the drawings.

Fig. 17 is a left side view of the whole combine harvester according to the second embodiment of the invention. Fig. 18 is a right side view of the whole combine harvester according to the second embodiment of the invention. Fig. 19 is a top view of the whole combine harvester according to the second embodiment of the invention. As shown in these figures, the combine harvester according to the embodiment of the present invention has: a traveling machine body that is self-propelled by a pair of left and right crawler traveling devices 201, 201 and has a driver 202 to which a driver seat 202a is attached; a threshing machine 204 mounted on the rear side of the body frame 203 of the traveling body; a grain bagging unit 210 equipped with a bagging box 211 provided at a lateral side of the thresher 204; and a harvesting part 220 connected to a feeding device 221 at the front of the thresher 204.

The combine harvester is used for harvesting rice, wheat and the like.

That is, the harvesting unit 220 includes, in addition to the feeding device 221, the following components: a harvester frame 222 connected to the front end of the feeding device 221; crop dividers 223 provided on both lateral sides of the front end portion of the harvester frame 222; a harvesting device 224 which is disposed on the front end of a frame portion 222a of the harvester frame 222 on the harvester frame 222 and is provided in a freely drivable clipper shape; a screw feeder 225 rotatably disposed on the harvesting frame 222 in the vicinity of the rear of the harvesting device 224 and on the upper surface side of the frame portion 222 a; and a rotary drum 227, wherein the rotary drum 227 is rotatably supported by a pair of left and right support arms 226, which extend forward from the upper portion of the base end side of the harvester frame 222.

The feeding device 221 swings up and down with respect to the threshing machine 204 about a lifting axis P extending transversely of the machine body by a hydraulic cylinder 228, whereby the harvesting unit 220 is lifted up and down to a lowered operation state in which the stand portion 222a of the harvesting frame 222 is lowered to the vicinity of the ground and a raised non-operation state in which the harvesting frame 222 is raised greatly from the ground. When the traveling machine body is driven in the lowered operation state of the harvesting unit 220, the harvesting unit 220 performs harvesting processing for harvesting upright straw and processing for supplying harvested straw to the thresher 204.

That is, upright straw is separated into a harvesting object and a non-harvesting object by the pair of left and right crop dividers 223, and then harvested by the harvesting device 224 while the upright straw as the harvesting object is raked up to the harvesting device 224 by the rotary reel 227. The harvested straw is transported laterally along the stand portion 222a to the front of the feeder 221 by the screw plates 225a at both end sides of the screw feeder 225. The harvested straw reaching the front of the feeding device 221 is fed to the inlet of the feeding device 221 located at the rear side of the screw feeder 225 by the gathering of a conveying arm 225b provided integrally rotatably in the middle of the screw feeder 225. The harvested straw fed into the feeder 221 is then transported to the rear via the interior of the feeder 221 by means of a conveyor 229 located inside the feeder 221. The whole of the harvested straw reaching the rear end of the feeder 221 from the roots to the tips is thrown into the threshing chamber (not shown) of the threshing machine 204 by the gathering action of the conveyor 229.

As shown in fig. 29, the distal end portion 225c of each screw plate 225a of the screw feeder 225 is formed of a steel wire rod welded to the screw plate 225 a.

That is, when wear occurs on the end portion 225c of the spiral plate 225a, the worn steel wire rod can be replaced by installing a new steel wire rod, and repair can be performed only by replacing the end portion 225 c.

The threshing machine 204 performs threshing processing by a threshing cylinder (not shown) that rotates the harvested straw that is thrown into the threshing chamber.

As shown in fig. 18, the grain bagging unit 210 includes a bag supporting unit that supports an upper end side of the grain bag mounted on the discharge tube 212 by a bag supporting rod 213 and supports a lower end side of the grain bag by a bag receiving table 214, in addition to the bagging box 211. Wherein the discharge tube 212 is located at the lower part of the bagging tank 211.

The bagging box 211 supplies and stores dehulled grains from a screening unit (not shown) of the thresher 204 by a thresher 215 (see fig. 18), and discharges the stored dehulled grains from the discharge drum 212 into grain bags.

As shown in fig. 18 and 19, the grain bagging portion 210 includes a pair of front and rear work aids 216, 216. Each work auxiliary 216 is supported so as to be switchable between a lowered use posture in which it protrudes from the bag support portion to the outside in the lateral direction of the traveling machine body as shown by a solid line in fig. 18 and 19, and a raised storage posture in which it is located above the bagging box 211 as shown by a two-dot chain line in fig. 18. By switching the work auxiliary members 216 to the lowered use posture, the work auxiliary members 216 are positioned at a height H of 1.0 to 1.1m from the upper surface of the bag receiving table 214, so that a user riding for the bagging work on the grain bagging portion 210 can use the work auxiliary members as the waist support members.

As shown in fig. 30, 31, and 32, the driver seat 202a is supported on a seat support table 233 via a pair of left and right mounting members 230 and 230 provided on the lower surface side of the driver seat 202a, a connecting shaft 231 provided at the front end portions of the pair of left and right mounting members 230 and 230, and a support member 232 rotatably supporting both end portions 231a of the connecting shaft 231 by support plate portions 232 a. The seat support table 233 serves as an engine cover that covers the engine 205. Each mounting member 230 is placed and supported on the upper surface of the seat support table 233 via a cushion rubber 234 mounted on the rear end portion of the mounting member 230 and a cushion rubber 234 mounted on the connecting shaft mounting member 230 a.

The seat support table 233 has a seat fixing mechanism 236 provided with a seat fixing body 235, and the seat fixing body 235 is provided on the upper surface side of the seat support table 233. The seat fixing mechanism 236 includes a lock pin 237 detachably attached to the seat fixing body 235 in addition to the seat fixing body 235. The seat fixing mechanism 236 is configured to fix the driver seat 202a in the lowered use posture by attaching the lock pin 237 to the pair of left and right longitudinal pieces 235a, 235a of the seat fixing body 235, thereby stopping the lock pin 237 from above on the rear end portion of the mounting member 230 and preventing the mounting member 230 from swinging upward around the axial center of the end portion 231a of the connecting shaft 231.

That is, the fixing of the seat 202a by the seat fixing mechanism 236 can be released by removing the lock pins 237 from the seat fixing body 235, and the seat 202a can thereby swing upward relative to the seat support table 233, and can be switched to the maintenance-use upward open posture above the open seat support table 233.

The above-described rotary drum 227 is described below.

Fig. 21 is a side view of the rotary drum 227. Fig. 22 is a plan view of the rotary drum 227. Fig. 23 is a front view of one end side of the rotary drum 227. Fig. 24 is a front view of the other end side of the rotary drum 227. As shown in these drawings, the rotary drum 227 includes: a drive shaft 240 rotatably supported at the distal ends of the pair of support arms 226, 226; a spool frame 241 integrally rotatably provided at left and right end portions of the drive shaft 240 and having a pentagonal shape as viewed from the side of the traveling machine body; a tooth support portion 242 made of a circular pipe material, which is provided on the rotary drum 227 so as to be aligned in the circumferential direction of the rotary drum 227 across the pair of left and right drum frames 241, and which is disposed so as to be one at each of the five top portions of the drum frames 241.

Each roll frame 241 includes: a sheet metal roll frame body 241b having five arms 241 a; a resin block 243 provided at the distal end portion of each arm 241 a; an annular band plate 244 wound around the five blocks 243 and connected to the arm 241a by common fastening bolts shared with the blocks 243. Each block 243 constitutes an attachment portion to which the tooth support portion 242 is rotatably attached. The annular band plate 244 is formed of a split band plate material split at the portion of each arm 241a.

The rotary spool 227 has: teeth 245 and 246 provided in the respective tooth support portions 242 in a row along a rotational spool rotation axis X1 (hereinafter referred to as spool rotation axis X1) of the drive shaft 240; the tooth holding mechanism 260 is provided on the lateral outer side of one of the rotary reels 227, and has an auxiliary rotary body 261 having a pentagonal shape when viewed from the side of the traveling machine body.

The pair of support arms 226, 226 of the rotary drum 227 are vertically swung with respect to the harvester frame 222 about the axial center Y1 of the connecting shaft 251 by the hydraulic cylinder 250 connected to one of the pair of support arms 226, 226 and the harvester frame 222, whereby the rotary drum 227 is lifted up and down to the lowered work state and the raised non-work state.

Fig. 25 is a side view of the rotary spool 227 in a lowered operation state on the low position side. As shown in the figure, when the lower end side of the rotary drum 227 is positioned near the ground G by the pair of left and right support arms 226, 226 being operated to descend, the rotary drum 227 is brought into a lowered operation state on the lower position side. In this way, by the rotation of the drive shaft 240, the rotary spool 227 rotates around the spool rotation axis X1, and the teeth 245, 246 of the respective tooth support portions 242 are rotated around the spool rotation axis X1 in the rotation direction a. The teeth 245 and 246 rotate while maintaining a downward extending posture from the tooth support 242 by the tooth holding mechanism 260, and the distal ends 245a and 246a of the teeth 245 and 246 describe a rotation locus T that moves rearward of the distal end 223a of the crop divider 223 at a lower ground level H1 than the distal end 223a of the crop divider 223 and moves forward of the harvesting device 224 at a lower ground level H2 than the distal end of the harvesting device 224.

Thus, even if the upright straw falls down deeply, the rotary drum 227 can cause the teeth 245 and 246 to accurately catch the upright straw and rake the upright straw to the harvesting device 224 even if the upright straw is not subjected to the action of the divider 223.

Fig. 26 is a side view of the lowering operation state of the high position side of the rotary spool 227. As shown in the figure, when the lower end side of the rotary drum 227 is positioned slightly away from the ground G by the pair of left and right support arms 226, 226 being operated to descend, the rotary drum 227 is brought into a high-position-side descending operation state. In this way, by the rotation of the drive shaft 240, the rotary spool 227 rotates around the spool rotation axis X1, and the teeth 245, 246 of the respective tooth support portions 242 are rotated around the spool rotation axis X1 in the rotation direction a. The teeth 245 and 246 rotate while maintaining a downward extending posture from the tooth support 242 by the tooth holding mechanism 260, and the distal ends 245a and 246a of the teeth 245 and 246 describe a rotation trajectory T1, and the rotation trajectory T1 moves at a height above the ground height H1 of the distal end 223a of the crop divider 223 behind the distal end 223a of the crop divider 223.

In this way, in the high-position-side descending operation state, the rotary reel 227 can rake up and feed the upright straw to the harvesting device 224 while avoiding the grounding of the teeth 245 and 246, regardless of the forward-backward inclination of the traveling machine body.

As shown in fig. 27, the reel rotation axis X1 is arranged such that, in the lowered operation state of the rotary reel 227, a straight line S passing through the reel rotation axis X1 and the harvesting device 224 becomes a vertical line perpendicular to the upper surface of the harvesting blade of the harvesting device 224, and even if the extending angle of each tooth 245, 246 extending from the tooth support portion 242 is changed, straw can be well prevented from being lifted from the harvesting device 224 and supplied to the harvesting device 224.

That is, the teeth 245, 246 shown in solid lines in fig. 27 represent teeth supported on the tooth support portion 242 at a standard extension angle. The teeth 245 and 246 shown by the broken lines in fig. 27 show teeth supported in a retreating inclined posture as compared with the normal extending angle posture. The teeth 245 and 246 shown by two-dot chain lines in fig. 27 are supported in a posture inclined to the advancing side compared to the posture of the normal extension angle. As shown by these lines, even if the extension angle of the teeth 245, 246 from the tooth support 242 is changed, the teeth 245, 246 can be moved above the harvesting device 224 without greatly changing the spacing between the end of the teeth and the harvesting device 224.

Among the plurality of teeth 245 and 246 supported by the respective tooth support portions 242, the tooth 246 located at the lateral end side of the left and right rotary drums is the end side tooth 246, and the tooth 245 located at the inner side of the rotary drum is the inner side tooth 245. The end side teeth 246 and the inner side teeth 245 of the respective tooth support portions 242 are made of a solid iron round bar material extending from the tooth support portions 242. As shown in fig. 22 and 23, each of the inner teeth 245 of each of the teeth supporting portions 242 is formed of a single round bar material bent so as to have the inner teeth 245 at both ends and a connecting portion 247 connected to the teeth supporting portion 242 at an intermediate portion.

The end side teeth 246 have an outer diameter that is larger than that of the inner side teeth 245 such that each end side tooth 246 of each tooth support 242 has a bending strength that is greater than that of each inner side tooth 245.

That is, on the lateral end side of the rotary reel 227, there is a case where upright stalks of the uncut land are entangled, and the upright stalks having a large reaction force applied to the end side teeth 246 are raked. Therefore, even if receiving a large reaction force from the straw, the end-side teeth 246 are not bent, and are locked to the upright straw, thereby firmly raking the straw to the harvesting device 224.

On the other hand, on the inner side of the rotary reel 227, the upright straw of the uncut land is not entangled, and the upright straw with a small reaction force applied to the inner side teeth 245 may be raked. Therefore, the inner teeth 245 are relatively easily deflected by the reaction force from the upright straw to lock the upright straw, and the straw can be quickly raked up to the harvesting device 224.

As shown in fig. 21, each inner tooth 245 of each tooth support portion 242 is formed in a curved state in which the tip end side of the inner tooth 245 is located further toward the outer circumferential side of the rotary drum than the tip end side of the end side tooth 246.

That is, if the end side teeth 246 of the rotary drum 227 are grounded, the end side teeth 246 have a bending strength greater than that of the inner side teeth 245, and thus are easily deformed or broken. However, even when the rotary drum 227 is grounded, the inner teeth 245 are grounded and the end teeth 246 are not grounded, so that the inner teeth 245 are easily elastically deformed due to having a small bending strength, and the end teeth 246 are not plastically deformed or broken due to not being grounded, so that it is difficult for both the inner teeth 245 and the end teeth 246 to be plastically deformed or broken.

As shown in fig. 21, the five tooth supporting portions 242 are respectively provided as a first tooth supporting portion 242A, a second tooth supporting portion 242B, a third tooth supporting portion 242C, a fourth tooth supporting portion 242D, and a fifth tooth supporting portion 242E. In addition to the pair of the first tooth support portion 242A and the fifth tooth support portion 242E adjacent to each other in the rotational direction of the rotary drum, the other pair of the tooth support portions 242, 242 (i.e., the pair of the tooth support portions 242, 242 constituted by the first tooth support portion 242A and the second tooth support portion 242B, the pair of the tooth support portions 242, 242 constituted by the second tooth support portion 242B and the third tooth support portion 242C, the pair of the tooth support portions 242, 242 constituted by the third tooth support portion 242C and the fourth tooth support portion 242D, and the pair of the tooth support portions 242, 242 constituted by the fourth tooth support portion 242D and the fifth tooth support portion 242E) are arranged so as to be offset from each other by a distance D1 (i.e., a distance D1) corresponding to the mounting distance D1 in the rotational axis direction of the rotary drum, as shown in fig. 22.

That is, among the pair of tooth support portions 242, 242 constituted by the first tooth support portion 242A and the second tooth support portion 242B, the pair of tooth support portions 242, 242 constituted by the second tooth support portion 242B and the third tooth support portion 242C, the pair of tooth support portions 242, 242 constituted by the third tooth support portion 242C and the fourth tooth support portion 242D, and the pair of tooth support portions 242, 242 constituted by the fourth tooth support portion 242D and the fifth tooth support portion 242E, the inner teeth 245 of one tooth support portion 242 are arranged in the circumferential direction of the rotary drum with respect to each other and the inner teeth 245 of the other tooth support portion 242. Thus, even if there are upright straws located between the inner teeth 245 of the tooth support portion 242 reaching below the rotary reel 227 and not caught by the inner teeth 245, the rotary reel 227 can catch the upright straws by the inner teeth 245 of the tooth support portion 242 reaching next, and in this state, rake the upright straws to the harvesting device 224.

As shown in fig. 23 and 24, the rotary drum 227 has a tooth cover 253 attached to each of the tooth support portions 242. As shown in fig. 28, each of the tooth covers 253 covers the connecting portion 247 of the inner teeth 245 so that straw chips and the like do not become entangled in the connecting portion 247. Each of the tooth covers 253 is formed of a resin cylinder having a slit 254 formed over the entire length thereof, and the slit 254 is elastically deformed to an open state, whereby the tooth cover can be attached to and detached from the tooth support portion 242 through the opened slit 254.

Fig. 21 shows a side view of the tooth holding mechanism 260. Fig. 23 shows a front view of the tooth holding mechanism 260. As shown in these figures, the tooth holding mechanism 260 includes, in addition to the auxiliary rotating body 261, the following: a support body 262 supported on the protruding portion 226a of the support arm 226 and having a circular shape when viewed from the side of the rotary drum; a link 263 provided corresponding to each of the tooth support portions 242 so as to span the auxiliary rotating body 261 and the spool frame 241.

The supporting body 262 is externally fitted to the boss 226a at the mounting hole 262a, and is fixed to a supporting plate 264 connected to the boss 226a by a fixing bolt 265. The support body 262 has three support rollers 266, and these support rollers 266 are engaged with the circular mounting holes 261a of the auxiliary rotating body 261 and are disposed at the periphery of the support body 262 in a dispersed manner. The auxiliary rotating body 261 is pivotally supported by the support body 262 by the three rollers 266, and rotates around an axis Z eccentrically disposed at a central portion of the support body 262 from the reel rotation axis X1. The reel frame side end of each link 263 is integrally rotatably connected to the corresponding rotation support shaft 242a of the tooth support 242. The end of each link 263 on the auxiliary rotating body side is rotatably connected to the top of the auxiliary rotating body 261.

Accordingly, the tooth holding mechanism 260 rotates the auxiliary rotating body 261 around the axis Z different from the spool rotation axis X1 by the driving force transmitted from the rotation spool 227 via the link 263 as the rotation spool 227 rotates, and rotates the rotation support shafts 242a of the respective tooth support portions 242 with respect to the spool frame 241 by the link 263 to operate the respective tooth support portions 242, and is operable to hold the posture in which the end side teeth 246 and the inner side teeth 245 of the respective tooth support portions 242 extend downward from the tooth support portions 242, regardless of the rotation spool 227.

Fig. 33 is a side view at the tooth arrangement portion of the rotary drum 227 having the second embodiment structure.

The rotary drum 227 having the second embodiment has end-side teeth 246 and inner-side teeth 245, and the extension length L1 of the end-side teeth 246 extending from the tooth support portion 242 is set shorter than the extension length L2 of the inner-side teeth 245 extending from the tooth support portion 242.

That is, if the rotary drum 227 is grounded with the end side teeth 246, the end side teeth 246 have a bending strength greater than that of the inner side teeth 245, and thus are easily deformed or broken. However, even when the rotary drum 227 is grounded, the inner teeth 245 are grounded and the end teeth 246 are not grounded, so that the inner teeth 245 are easily elastically deformed due to having a small bending strength, and the end teeth 246 are not plastically deformed or broken due to not being grounded, so that it is difficult for both the inner teeth 245 and the end teeth 246 to be plastically deformed or broken.

Instead of the inner teeth 245 of the above-described embodiment, the inner teeth 245 may be formed in a bent state with an angular shape so that the distal end sides of the inner teeth 245 are positioned closer to the outer peripheral side of the rotary drum than the distal end sides of the end side teeth 246. In this case, the object of the present invention can be achieved.

Claims (2)

1. A combine harvester comprising a threshing machine (4), wherein the threshing machine (4) is provided with a threshing part (30) for throwing the whole of the harvested straws into a threshing chamber (31) and carrying out threshing treatment by a threshing cylinder (32) capable of rotating and driving, and a screening part (40) which is positioned below the threshing chamber (31) and carries out screening treatment on threshing treatment objects from the threshing chamber (31) through a screening device (42) capable of swinging,

a cover (73) is arranged on the lateral outer side of the threshing chamber (31);

an upper lateral side wall portion (71 a) is provided on the inner surface side of the cover (73) so as to be separated from a receiving net (33) located in the threshing chamber (31), and the upper lateral side wall portion (71 a) is located between a portion of the receiving net (33) on the cover (73) side and the cover (73) to form the threshing chamber (31);

a pivot mechanism (81) having a structure in which the upper lateral side wall portion (71 a) and the cover (73) are supported so as to be capable of swinging and opening, and the upper lateral side wall portion (71 a) and the cover (73) are configured so as to be capable of swinging and opening integrally with each other in a state in which the receiving net (33) is entirely attached to the threshing chamber (31);

The upper lateral side wall part (71 a) is provided with an upper side wall part which is vertically oriented and forms an upper side, a lower side wall part which extends downwards from the lower end of the upper side wall part and is inclined to be positioned inside the threshing machine body more towards the extending end side, and a lower end side wall part which extends from the lower end of the lower side wall part towards the outside of the threshing machine body and is inclined to be positioned at a lower arrangement height more towards the extending end side;

in a state where the cover (73) is closed, the upper end of the lower end side wall portion and the lower end of the lower side wall portion are located inside the cover (73) at positions below the portion on the cover (73) side that enters the receiving net (33), and are located within a range in the left-right direction of the portion on the cover (73) side of the receiving net (33).

2. The combine harvester according to claim 1, comprising a loading/unloading mechanism (80) for detachably supporting the upper lateral side wall portion (71 a) and the cover (73), wherein the upper lateral side wall portion (71 a) and the cover (73) are integrally attachable/detachable,

the loading/unloading mechanism (80) comprises: a pair of upper and lower pivot shafts (83) provided by attaching a pair of upper and lower support bodies (82) to the machine frame (78), and a pair of upper and lower connecting holes (85) provided by connecting a pair of upper and lower connecting plates (84) to the inner surface side of the cover (73),

When the upper lateral side wall portion (71 a) is opened by swinging, the upper lateral side wall portion (71 a) can be fixed in an open state by attaching the other end side of the lock lever (89) to a lock lever hole (82 a) provided in the support body (82) while the one end side of the lock lever (89) is rotatably and vertically supported by the connecting plate (84) on the lower side.