combine

Abstract

To solve such a problem that it is desired to change a shredding state of waste straws according to a difference in a work situation.SOLUTION: A waste straw shredding device 8 which shreds waste straws after threshing processing discharged from a thresher 4 comprises: a guide plate 60 which guides the waste straws discharged from a rear end part of a threshing processing space 34 so as to flow down toward a rear lower side; a plurality of stationary blades 61 which is provided in a state of protruding upward from the guide plate 60; and a plurality of rotary blades 62 which is located on an upper side of the guide plate 60 and rotate around a lateral shaft core P6 to cut the waste straws in coordination with the stationary blades 61. The guide plate 60 is configured to be able to change an interval with an outer end rotation locus Q of the rotary blade 62 in a guide path in which the waste straws are guided to flow down by moving in an approaching / separating direction between a state of approaching the rotary blade 62 and a state of separating from the rotary blade 62.SELECTED DRAWING: Figure 15

Description

[Technical field]

[0001] The present invention relates to a combine harvester equipped with a threshing device and a waste straw shredding device that shreds waste straw discharged from the threshing device after threshing processing. [Background technology]

[0002] The waste straw shredding device is equipped with a guide plate that guides the waste straw discharged from the threshing device downward and rearward, multiple fixed blades that protrude upward from the guide plate, and multiple rotary blades that rotate around a horizontal axis and cut the waste straw in cooperation with the fixed blades. Conventionally, the position of the guide plate has always been constant, and the distance between the guide plate and the outer end rotation trajectory of the rotary blades has been maintained constant (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-000189 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above conventional configuration, for example, when the amount of crops processed per unit time increases, the amount of waste straw supplied to the waste straw shredding device may be too much, causing the waste straw to accumulate between the guide plate and the rotary blade, making it difficult to shred the straw. In addition, it cannot be used in other applications, such as when the waste straw is not shredded into small pieces and is left in a long state, so it has the disadvantage of being difficult to use.

[0005] Therefore, there has been a demand for a system that allows the shredding state of waste straw to be changed depending on the working conditions. [Means for solving the problem]

[0006] A characteristic configuration of a combine harvester according to the present invention includes a threshing machine in which a threshing space is formed between a threshing drum and a receiving net provided below the threshing drum, and a waste straw shredding device provided behind the threshing machine and shredding waste straw discharged from the threshing machine after threshing. The waste straw shredding device includes a guide plate that guides the waste straw discharged from the rear end of the threshing space downward and rearward, a plurality of fixed blades provided so as to protrude upward from the guide plate, and a plurality of rotary blades positioned above the guide plate and rotating about a horizontal axis to cut the waste straw in cooperation with the fixed blades. The guide plate is configured to move in an approaching / removing direction between a state approaching the rotary blade and a state moving away from the rotary blade, thereby changing the distance between the guide plate and the outer end rotation trajectory of the rotary blade in the guide path along which the waste straw is guided downward. The guide plate has an end portion on the treatment space side extended to a position higher than the height of the rotation axis of the rotary blade. The point is that...

[0007] According to the present invention, when the guide plate is brought closer to the rotary blade and the distance between the guide plate and the outer end of the rotary blade in the guide path is narrowed, the waste straw guided down by the guide plate is cut by the rotary blade and is effectively shredded. On the other hand, when the guide plate is moved away from the rotary blade and the distance between the guide plate and the outer end of the rotary blade in the guide path is widened, clogging can be avoided in the waste straw shredder when a large amount of waste straw is discharged. Also, by making most of the waste straw guided down the guide path less susceptible to the cutting action of the rotary blade, it is possible to discharge the waste straw without shredding it.

[0008] Therefore, it is possible to change the shredding state of the waste straw depending on the working conditions. In addition, as the rotary blade rotates, it acts to rake in the waste straw sent out from the threshing device. At this time, for example, if the end of the guide plate is located lower than the height of the rotary shaft, the waste straw may get caught and may not be guided properly. In contrast, in the above configuration, the guide plate extends to a position higher than the height of the rotary shaft, so the waste straw is properly sandwiched between the guide plate and the rotary blade and can be properly guided rearward and downward. .

[0009] In the present invention, it is preferable that the guide plate is configured to move in the approaching and separating directions by swinging about a lateral rotation fulcrum provided at an upper portion.

[0010] This configuration can be achieved with a simple support structure in which the guide plate is supported so as to swing around a horizontal pivot point. In addition, since the horizontal pivot point is provided at the top, the position of the top of the guide plate does not change significantly even when it is swung, and there is no risk of disturbing the delivery of the waste straw.

[0011] In the present invention, a casing is provided that covers the sides and top of the straw shredding device, and it is preferable that a manual operating device is provided on the outer side of the casing for switching the guide plate between a state approaching the rotating blade and a state away from the rotating blade.

[0012] According to this configuration, the manual operation device can be operated from outside the casing, so the state of the guide plate can be changed without the need for troublesome work such as removing the casing.

[0013] In the present invention, the fixed blade is supported so that its vertical position can be adjusted so that the amount of upward protrusion from the guide plate can be changed, and it is preferable that when the fixed blade is adjusted to its lowest position, it does not cut the straw regardless of the position of the guide plate within the entire range of its movement stroke in the approaching and retracting direction.

[0014] According to this configuration, the fixed blade can be adjusted to the lowest position so that the fixed blade does not cut. When set in this way, the straw can be discharged in a long state without being finely chopped, regardless of changes in the state of the guide plate.

[0015] In the present invention The above It is preferable that a relay plate be provided in a fixed position for guiding the waste straw from the rear end of the treatment space toward the end of the guide plate on the treatment space side.

[0016] According to this configuration Ba, medium The provision of a joint plate makes it possible to guide the waste straw away from the threshing device.

[0017] In the present invention, it is preferable that the relay plate and the guide plate are provided in a continuous state with no gap therebetween.

[0018] According to this configuration, the straw can be prevented from leaking out through the gap between the relay plate and the guide plate or from becoming caught in the gap and becoming stuck there, thereby enabling the straw to be guided properly. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is an overall left side view of the combine harvester. [Diagram 2] FIG. [Diagram 3] FIG. 2 is an overall right side view of the combine harvester. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 2 is a side view showing a threshing transmission structure. [Figure 7] FIG. 2 is a side view showing a threshing transmission structure. [Figure 8] This is a longitudinal front view of the winnowing machine. [Figure 9] FIG. [Figure 10] FIG. 4 is a side view showing the working unit belt transmission mechanism in a first transmission state. [Figure 11] FIG. 11 is a side view showing the working unit belt transmission mechanism in a second transmission state. [Figure 12] A side view of the straw discharge speed change mechanism. [Figure 13] FIG. 2 is a cross-sectional plan view of the waste straw shredding device. [Figure 14] FIG. 4 is a perspective view showing a supported state of a guide plate. [Figure 15] FIG. 2 is a vertical sectional side view of the waste straw shredding device in an operating state. [Figure 16] FIG. 2 is a vertical sectional side view of the waste straw shredding device in a non-operating state. [Figure 17] Showing the installation of the threshing cover [Figure 18]18 is a cross-sectional view taken along line XVIII-XVIII in FIG. 17. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of a combine harvester according to the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of the arrow F in the drawings is "forward", the direction of the arrow B is "backward", the direction of the arrow L is "left", and the direction of the arrow R is "right". The direction of the arrow U in the drawings is "upward", and the direction of the arrow D is "downward".

[0021] [Overall structure] 1 to 3 show a normal type combine harvester for harvesting rice, wheat, etc. This combine harvester has a traveling machine body equipped with a pair of left and right crawler traveling devices 2 attached to the lower part of the machine frame 1, and a reaping and conveying unit 3 that cuts the planted culms to be harvested and conveys them rearward is connected to the front part of the traveling machine body so as to be able to swing and rise and fall about a horizontal axis P1. On the machine frame 1, a threshing device 4, a grain tank 5, a grain discharge device 6, a driving unit 7, a straw shredding device 8, etc. are provided.

[0022] The threshing device 4 threshes the harvested stalks from the reaping and transporting unit 3, sorts the threshed material obtained by the threshing process, and transports the sorted material to the outside of the device. The grain tank 5 stores the grains from the threshing device 4. The grain discharge device 6 discharges the grains stored in the grain tank 5 to the outside of the machine. The driver boards the driving unit 7 to operate the machine. The straw shredding device 8 is provided at the rear of the threshing device 4, and shreds the straw after threshing by the threshing device 4.

[0023] The driving unit 7 is located on the right front side of the machine body, and the grain tank 5 is located behind the driving unit 7. The threshing device 4 is located on the left side, and the grain tank 5 is located on the right side, so that the threshing device 4 and the grain tank 5 are lined up in the left-right direction. An engine 9 is provided below the driving unit 7 as a power source, and the power of the engine 9 is transmitted to each part.

[0024] The reaping and conveying section 3 includes a reaping section 10 that reaps the planted stalks as the machine travels, and a feeder 11 that conveys the reaped stalks reap by the reaping section 10 toward the threshing device 4 at the rear of the machine. The reaping and conveying section 3 is supported so as to be able to swing up and down freely around a horizontal axis P1 by the extension and contraction of a hydraulic cylinder 12.

[0025] The harvesting section 10 is equipped with a pair of left and right dividers 13 that separate planted culms to be harvested from planted culms to be not harvested, a rotating reel 14 that rakes the planted culms to be harvested rearward, a clipper-shaped cutting blade 15 that cuts and harvests the base side of the planted culms to be harvested, and an auger 16 that feeds the cut harvested culms laterally to the middle in the left-right direction, gathers them up, and sends them rearward.

[0026] [Grain tank] As shown in Figures 17 and 18, a bottom screw 17 for discharging grains from the bottom is provided inside the grain tank 5. The grains sent by the bottom screw 17 are discharged to the outside through the vertical conveying section 6A of the grain discharging device 6. The grain tank 5 is configured to be switchable to a maintenance position in which it protrudes laterally around the drive shaft center Y of the vertical conveying section 6A in order to perform maintenance work inside the machine, as shown in Figures 2 and 18.

[0027] As shown in Fig. 17, the bottom surface of the grain tank 5 is configured to be inclined so that the center is lower when viewed from the front, so as to guide the stored grains downward toward the bottom screw 17. A lower cover 18 is provided on the right side of the grain tank 5 so as to cover the inclined portion from the outside.

[0028] As shown in Figures 3 and 18, the lower cover 18 has a front cover portion 18A on the front side of the body, a rear cover portion 18B on the rear side of the body, and a rear cover portion 18C that covers the grain tank 5 from the rear side.

[0029] The rear cover portion 18C has a right portion 18C1 and a left portion 18C2. The right portion 18C1 is supported at its left end so as to be swingable about the vertical axis, and is swung open in advance when the grain tank 5 is switched to the maintenance position. The left portion 18C2 is supported at its left end so as to be swingable open about the vertical axis.

[0030] The front cover part 18A is short in the front-rear direction and can be easily removed. The rear cover part 18B is long in the front-rear direction, so the removal work can be cumbersome. Therefore, the rear cover part 18B is configured to be able to switch to the maintenance position while attached to the grain tank 5. The back cover part 18C has a right part 18C1 and a left part 18C2. The right part 18C1 has a left end supported so that it can swing about the vertical axis, and is swung open in advance when the grain tank 5 is switched to the maintenance position. Also, the left end of the left part 18C2 is supported so that it can swing open about the vertical axis.

[0031] The rear cover part 18B is configured so that a lower locking part 19 at the front-rear intermediate part locks with a locking device 20 extended from the grain tank 5, and an upper elastic locking mechanism 21 is locked and held by a locking device 22 provided on the grain tank 5 to hold the position. At the rear end part of the rear cover part 18B, the lower locking part 19 locks with a locking device 20A provided on the right part 18C1 of the back cover part 18C, and at the front end part of the rear cover part 18B, the lower locking part 19 locks with a locking pin 20B attached to the front wall part 5A of the grain tank.

[0032] The locking pin 20B is formed long in the front-rear direction, and a pair of front and rear locking parts 19 provided on the lower part of the front cover part 18A are configured to lock onto the locking pin 20B. The elastic lock mechanism 21 at the upper part is locked and held in position by a locking device 22 provided on the grain tank 5, just like the rear cover part 18B.

[0033] When switching the grain tank 5 to the maintenance position, only the front cover part 18A is removed and the transmission belt 87A of the belt transmission mechanism 87 that transmits power to the bottom screw 17 is released from its wound state. Then, the grain tank 5 can be switched to the maintenance position with the rear cover part 18B still attached.

[0034] [Threshing device] Next, the threshing device 4 will be described. As shown in Fig. 4, the threshing device 4 has an internal space surrounded by left and right side walls 4A (see Figs. 8 and 13) and a top plate 23, with a threshing section 24 provided at the top and a sorting section 25 provided below the threshing section 24. The harvested stalks are transported to the threshing section 24 by a feeder 11 provided at the front of the machine body, and the harvested stalks are subjected to threshing processing. In the sorting section 25, the threshed material obtained by the threshing processing is subjected to sorting processing.

[0035] A threshing drum 26 that threshes the crops by being rotated about an axis P2 along the front-rear direction of the machine body is provided inside the threshing section 24. As shown in Fig. 4, the threshing drum 26 has a threshing drum shaft 29 that is rotatably supported about the axis P2 across a front wall portion 27 and a rear wall portion 28, and is configured to rotate integrally about the threshing drum shaft 29.

[0036] The threshing drum 26 is provided with a number of support rods 30 equally spaced apart in the circumferential direction, and has bar-shaped threshing teeth 31 protruding outward from a number of positions aligned in the axial direction of each support rod 30. The top plate 23 of the threshing section 24 is provided with a dust-transport valve 32 that transports and guides the material to be processed toward the rear side (the right side in FIG. 1 ) along the rotation axis of the threshing drum 26 as the threshing drum 26 rotates.

[0037] An arc-shaped receiving net 33 is provided on the lower half of the outer periphery of the threshing drum 26. Although not described in detail, the receiving net 33 is composed of a mesh body of a known structure in which a large number of arc-shaped horizontal bars are connected to vertical bars along the axial direction that connect the horizontal bars, and a large number of through holes are formed for the grains to pass through.

[0038] A threshing space 34 that extends in an arc shape when viewed in the fore-and-aft direction of the machine body is formed between the threshing drum 26 and the receiving net 33, and threshing of the harvested stalks is carried out in this threshing space 34 by cooperation between the threshing drum 26 and the receiving net 33. The threshing drum 26 is configured to extend longer rearward than the receiving net 33. At the portion of the threshing drum 26 that extends rearward beyond the receiving net 33, an inlet for a waste straw shredder 8 that feeds in waste straw is formed below it.

[0039] As shown in Figure 4, the sorting section 25 is equipped with a oscillating sorting device 35 that transports and sorts the processed material that has leaked downward from the receiving net 33, a first grain recovery section 36 that recovers the first grains that have leaked from the oscillating sorting device 35 and transports them outside the device, a second grain recovery section 37 that recovers the second grains such as grains with branches that have leaked from the oscillating sorting device 35 and transports them outside the device, and a winnower 38 that supplies sorting air to the oscillating sorting device 35.

[0040] The first grain recovery section 36 is configured to transport the recovered grains to the outside of the threshing device 4 by the first grain recovery screw 36A. Then, the grains recovered by the first grain recovery section 36 are transported to the outside of the threshing device 4, and then transported upward by the lifting device 39 and stored in the grain tank 5.

[0041] The second grain recovery section 37 is configured to transport the collected second grains to the outside of the threshing device 4 by the second grain recovery screw 37A. After being transported to the outside of the threshing device 4, the second grains collected by the second grain recovery section 37 are returned to the threshing section 24 by the second grain return device 40 (see FIG. 5) and threshed.

[0042] The oscillating sorting device 35 has a sieve case 42 which has a rectangular frame shape in a plan view and which oscillates back and forth by the operation of a crank-type oscillating drive unit 41 provided on the lower rear side, and inside the sieve case 42 are grain pans 43, 44, a chaff sieve 45 for coarse sorting, a grain sieve 46, a chaff sieve 47 for fine sorting, etc.

[0043] 8 and 9, the winnower 38 includes a rotating shaft 48 that rotates counterclockwise in FIG. 9 around a horizontal axis P3, a pair of disk-shaped support members 49 supported on the outer periphery of the rotating shaft 48 so as to be integrally rotatable, and a plurality of rotating blades 50 connected to the pair of support members 49. An air intake opening 51 is formed at the location where the winnower 38 is provided on the left and right side walls 4A of the threshing device 4. As the winnower 38 rotates, outside air is taken in through the opening 51, and wind generated by the rotating blades 50 is supplied to the sorting section 25.

[0044] There is provided an air volume adjustment mechanism 52 which adjusts the air volume from the winnower 38 by changing the ventilation area in the opening 51. The air volume adjustment mechanism 52 is supported so as to be swingable up and down about the horizontal axis P4 and includes two upper and lower plates 53 which cover the opening 51 from the sides as they swing up and down and change the ventilation area, and a drive mechanism 54 which can swing the upper and lower plates 53 up and down together.

[0045] The upper and lower plates 53 are supported so as to be able to swing up and down about a horizontal axis P4 located at the front side of the upper and lower middle parts. The drive mechanism 54 is provided at the middle part in the lateral direction outside the front wall 4B of the threshing device 4, and includes a link mechanism 55 interlocked with the upper and lower plates 53, and an electric motor 56 for operating the link mechanism 55.

[0046] The actuator includes an operating arm 57 that extends across the left and right plate bodies 53 and swings about a horizontal axis P5 in response to the swinging operation of the link mechanism 55, and a pair of interlocking links 58 that swing the upper and lower plate bodies 53 integrally on the left and right sides in response to the swinging of the operating arm 57. One end of each of the upper and lower interlocking links 58 is pivotally connected to each of the upper and lower plate bodies 53, and the other end is both pivotally connected to the operating arm 57.

[0047] When the electric motor 56 is driven to operate the link mechanism 55 in an interlocking manner and the operating arm 57 swings forward, the upper and lower interlocking links 58 are pulled forward in an interlocking manner and the upper and lower plates 53 swing in directions away from each other. As a result, the opening area becomes larger. On the other hand, when the operating arm 57 swings backward, the upper and lower plates 53 swing in directions toward each other and the opening area becomes smaller. In this way, the opening area can be changed and adjusted.

[0048] [Waste straw shredding device] Next, the waste straw shredding device 8 will be described. The waste straw shredding device 8 is provided behind the threshing device 4 and shreds the waste straw discharged from the threshing device 4 after threshing.

[0049] As shown in Fig. 4 and Fig. 12 to Fig. 15, the waste straw shredding device 8 is covered by a waste straw cover 59 (one example of a casing) connected to the lower rear end of the threshing device 4. In the internal space covered by the waste straw cover 59, there are provided a guide plate 60 that guides the waste straw discharged from the rear end of the handling space 34 of the threshing device 4 downward toward the rear, a plurality of fixed blades 61 that are provided in a state of protruding upward from the guide plate 60, and a plurality of rotating blades 62 that are located above the guide plate 60 and rotate counterclockwise around a horizontal axis P6 in Fig. 15 to cut the waste straw in cooperation with the fixed blades 61. The waste straw cover 59 is formed in a box shape and includes an upper surface portion 63 that covers the upper and rear sides of the cutting space and a pair of left and right side wall portions 64 that cover both left and right sides of the cutting space.

[0050] The end of the guide plate 60 on the side of the handling space 34 extends to a position higher than the height of the axis P6 of the rotary blade 62. A relay plate 65 is provided in a fixed position to guide the discharged straw from the rear end of the handling space 34 toward the end of the guide plate 60 on the side of the handling space 34. The relay plate 65 and the guide plate 60 are provided in a connected state with no gap between them.

[0051] The rotary blades 62 are arranged at intervals in the horizontal and circumferential directions and are provided so as to protrude radially from the outer periphery of a cylindrical rotor 66 extending in the horizontal direction. The rotary blades 62 are connected to a mounting portion 67 fixed to the outer periphery of the rotor 66 by bolts.

[0052] The fixed blades 61 are provided in a row spaced apart in the horizontal direction and are supported by a frame member 68 located below the guide plate 60. The fixed blades 61 are provided so as to protrude upward through slits 69 (see FIG. 14) formed in the guide plate 60. The fixed blades 61 are supported so that their vertical position can be adjusted so that the amount by which they protrude upward from the guide plate 60 can be changed.

[0053] As shown in Fig. 13, both left and right sides of the frame member 68 are supported on the side wall 4A of the threshing device 4 so as to be swingable about the axis P7 of the horizontal support shaft 70. An operating lever 71 is provided on the outer lateral side of the side wall 4A, and the base end of the operating lever 71 is supported so as to be swingable about the axis of the horizontal support shaft 70. The middle part of the operating lever 71 in the longitudinal direction is connected to both left and right sides of the frame member 68 by a connecting bolt 72 provided in a state of inserting through the side wall 4A.

[0054] As shown in Fig. 12, a fastening fixture 73 consisting of a rod-shaped member long in the horizontal direction is screwed into the connecting bolt 72. An insertion hole 74 through which the connecting bolt 72 passes is formed as an arc-shaped long hole. When the fastening fixture 73 is loosened and the operating lever 71 is swung, the connecting bolt 72 moves along the insertion hole 74 (long hole), causing the frame member 68 to swing integrally.

[0055] The grip of the operating lever 71 is biased outwardly to the side so as to be away from the side wall for easy operation. A handle 75 for manual operation is provided on the other end of the fastening fixture 73. The handle 75 is positioned outwardly to the side so that the operating lever 71 does not get in the way.

[0056] When the operating lever 71 is swung, the frame member 68, together with the multiple fixed blades 61, swings up and down around the axis of the horizontal support shaft 70. When the frame member 68 is swung to the lowest position, as shown in Figure 16, it retreats below the guide plate 60 and no longer cuts the straw.

[0057] The guide plate 60 is configured to be able to change the distance between the outer end rotation trajectory Q of the rotary blade 62 in the guide path along which the discharged straw is guided downward by moving in the approaching / separating direction between a state approaching the rotary blade 62 (hereinafter referred to as a normal use state) and a state away from the rotary blade 62 (hereinafter referred to as a non-use state). Specifically, the guide plate 60 is configured to move in the approaching / separating direction by swinging about a horizontal axis P8 provided at the upper portion.

[0058] 14, the guide plate 60 is provided with connecting brackets 76 on both left and right sides. The brackets 76 are provided at the upper, middle, and lower parts. Of these, a fulcrum pin 77 located on the outer lateral side of the straw discharge cover 59 is inserted into an insertion hole 78 of the bracket 76 located at the upper part and attached to the bracket 76, and the guide plate 60 is supported so as to be swingable around an axis P8 of the fulcrum pin 77.

[0059] A fastening fixture 79 is attached to the bracket 76 located in the middle portion, which is located on the outer lateral side of the straw discharge cover 59, in the normal use state. The bracket 76 is fastened and fixed by fastening the fastening fixture 79. A knobbed bolt 80 is attached to the lower bracket 76, which is located on the outer lateral side of the straw discharge cover 59, and passes through the insertion hole 78 as a manual operating device.

[0060] A receiving tool 81 that receives and supports the knobbed bolt 80 in normal use is provided near the knobbed bolt 80 on the outer lateral side of the straw discharge cover 59. The receiving tool 81 is formed with an engagement groove 82 that receives and engages the knobbed bolt 80, and is fastened and fixed by a bolt 83 at a position different from the engagement groove 82. The bolt 83 passes through the straw discharge cover 59, and the receiving tool 81 can swing around the axis of the bolt 83 when the bolt 83 is loosened.

[0061] When the guide plate 60 is in the normal use state, the receiving tool 81 receives the knobbed bolt 80 and fixes it in place. The knobbed bolt 80 is also tightened and fixed, and the fastening fixture 79 is attached to the bracket 76 located in the middle portion and tightened and fixed. The receiving tool 81 corresponds to a manual operating tool.

[0062] When switching the guide plate 60 to the unused state, first, the frame member 68 is swung downward and withdrawn so that the guide plate 60 can swing downward. Then, the fastening fixture 79 is loosened and removed, the knobbed bolt 80 is loosened, and the bolt 83 is loosened to release the knobbed bolt 80 from the receiving fixture 81. Then, as shown in Fig. 16, the guide plate 60 swings downward by its own weight and moves away from the rotary blade 62, i.e., the guide plate 60 is switched to the unused state. In this state, the knobbed bolt can be tightened to fix the position.

[0063] As shown in Fig. 16, when the fixed blade 61 is adjusted to the lowest position, it does not protrude upward from the guide plate 60 even if the guide plate 60 is changed to the lowest position. Therefore, the fixed blade 61 does not cut the straw regardless of the position of the guide plate 60 in the entire range of the movement stroke in the approaching / removing direction. However, if the fixed blade 61 is adjusted to the middle position between the top and bottom, it is possible to change and adjust the distance between the guide plate 60 and the outer end rotation trajectory Q of the rotary blade 62 depending on, for example, the characteristics of the crop or the difference in the conveying amount by changing and adjusting the position of the guide plate 60 along the approaching / removing direction in the normal use state.

[0064] [Power transmission structure] Next, the power transmission structure will be described. As shown in FIG. 5, the power of an output shaft 9a of an engine 9 is input to a traveling mission 86 via a belt transmission mechanism 85, and is output from the traveling mission 86 to the left and right crawler traveling devices 2.

[0065] The power of the output shaft 9a of the engine 9 is transmitted to the bottom screw 17 of the grain tank 5 via a belt transmission mechanism 87, and then transmitted from the bottom screw 17 to the grain discharge device 6.

[0066] Power of the output shaft 9a of the engine 9 is transmitted to a counter shaft 89 via a belt transmission mechanism 88. The counter shaft 89 also serves as a rotation support shaft for the winnower 38 in the sorting section 25, and is provided in a state penetrating the inside of the threshing device 4, with power from the engine 9 being transmitted to a right side portion as one side in the left-right direction, and power being output from a left side portion as the other side in the left-right direction.

[0067] A working unit belt transmission mechanism 90 is provided which transmits the power output from the counter shaft 89 to the first husk collecting section 36, the second husk collecting section 37, and the oscillating sorting device 35 of the threshing device 4. Also, a reaping unit transmission mechanism 91 is provided which transmits the power output from the counter shaft 89 to the reaping unit 10. Therefore, the power output from the counter shaft 89 is configured to be branched and transmitted to the working unit belt transmission mechanism 90 and the reaping unit transmission mechanism 91.

[0068] The reaping unit transmission mechanism 91 transmits power to the reaping and conveying unit 3 via a belt transmission mechanism 92. Power is also transmitted to the threshing drum 26 via a gear-type speed change mechanism 93 and a second reaping unit belt transmission mechanism 94.

[0069] The working section belt transmission mechanism 90 is equipped with a working section speed change mechanism 95 that can change the speed of the power output from the counter shaft 89 and transmit it to the first item recovery section 36, the second item recovery section 37, and the oscillating sorting device 35.

[0070] An input side transmission mechanism 96 that transmits the power output from the counter shaft 89 to the working unit speed change mechanism 95, and an output side transmission mechanism 97 that transmits the power after speed change from the working unit speed change mechanism 95 to the sorting unit are provided. The input side transmission mechanism 96 and the output side transmission mechanism 97 are provided in a state where they are located closer to the threshing device 4 than the working unit speed change mechanism 95.

[0071] The input side power transmission mechanism 96 includes a pulley 98 provided on the counter shaft 89, a pulley 100 provided on the drive shaft 99, and an input side power transmission belt 101 wound around each of the pulleys.

[0072] The output side transmission mechanism 97 includes a first output side transmission mechanism 102 that transmits the power after the speed change from the working unit speed change mechanism 95 to the first object recovery section 36 and the second object recovery section 37, and a second output side transmission mechanism 103 that transmits the power from the first output side transmission mechanism 102 to the oscillating drive section 41.

[0073] The first output side transmission mechanism 102 includes a pulley 105 provided on a driven shaft 104, a pulley 106 provided on the rotating shaft of the first item recovery screw 36A, a pulley 108 provided on an intermediate shaft 107, a pulley 109 provided on the rotating shaft of the second item recovery screw 37A, and an output side transmission belt 110 wound around each of the pulleys.

[0074] The power transmitted to the first product collecting section 36 is transmitted to the grain lifting device 39. The power transmitted to the second product collecting section 37 is transmitted to the second product returning device 40. The second output side transmission mechanism 103 will be described later.

[0075] [Transmission mechanism for working section] The working section speed change mechanism 95 will now be described. As shown in FIGS. 5, 10 and 11, the working unit speed change mechanism 95 is provided so as to straddle from the counter shaft 89 to the sorting unit 25, in a state where it is located above the counter shaft 89 and the sorting unit 25 in a side view.

[0076] The working unit speed change mechanism 95 is provided with a drive shaft 99 to which the power output from the counter shaft 89 is transmitted, a driven shaft 104 that outputs the power after speed change to the sorting unit, two drive pulleys 111, 112 with different winding diameters provided on the drive shaft 99, two driven pulleys 113, 114 with different winding diameters provided on the driven shaft 104, and a speed change transmission belt 115 wound around the drive pulleys 111, 112 and the driven pulleys 113, 114. The working unit speed change mechanism 95 is configured to change the speed of the power output from the counter shaft 89 by switching the speed change transmission belt 115.

[0077] That is, the working unit speed change mechanism 95 is switchable between a first transmission state (see FIG. 10) in which the speed change transmission belt 115 is wound around a large diameter driving pulley 111 (an example of one of the driving pulleys) and a small diameter driven pulley 113 (an example of one of the driven pulleys), and a second transmission state (see FIG. 11) in which the speed change transmission belt 115 is wound around a small diameter driving pulley 112 (an example of the other driving pulley) and a large diameter driven pulley 114 (an example of the other driven pulley).

[0078] In the working unit speed change mechanism 95, the winding diameters of the drive pulleys 111, 112 and the driven pulleys 113, 114 are set so that the circumferential length of the speed change transmission belt 115 is the same in each of the first transmission state and the second transmission state. As a result, the tension of the speed change transmission belt 115 is substantially the same in the first transmission state shown in Fig. 10 and the second transmission state shown in Fig. 11, the position of the tension wheel 116 is substantially the same, and the belt tension mechanism 117 of the same configuration can be used in both states.

[0079] [Second output side transmission mechanism] The second output side transmission mechanism 103 is provided with a drive pulley 118 having two stages of pulley portions 118a, 118b with different winding diameters that are provided on an intermediate shaft 107 as a drive side rotating shaft and are connected in series, a driven pulley 120 provided on a swing operation shaft 119 as a driven side rotating shaft, and a second output transmission belt 121 wound around the drive pulley 118 and the driven pulley 120. The second output transmission mechanism 103 is configured to be able to change the speed of power by reversing the posture of the drive pulley 118 to switch between a state in which the second output transmission belt 121 is wound around one of the pulley portions 118a of the drive pulley 118 and a state in which the second output transmission belt 121 is wound around the other pulley portion 118b.

[0080] The drive pulley 118 is provided with a relay pulley 108 in the first output side transmission mechanism 102 between a large diameter pulley portion 118a and a small diameter pulley portion 118b. The large diameter pulley portion 118a, the small diameter pulley portion 118b, and the relay pulley 108 are integrally formed.

[0081] Furthermore, by reversing the position of the drive pulley 118 from left to right, the power can be changed between a low-speed state (see Figure 10) in which the second output transmission belt 121 is wound around the small-diameter pulley portion 118a of the drive pulley 118, and a high-speed state (see Figure 11) in which the second output transmission belt 121 is wound around the large-diameter pulley portion 118a.

[0082] [Belt transmission mechanism for straw discharge] A waste straw belt transmission mechanism 125 is provided which transmits power from the counter shaft 89 to the waste straw shredder 8. The waste straw belt transmission mechanism 125 is provided with a drive pulley 126 provided on the counter shaft 89, an intermediate shaft 127 provided on the lateral side of the rear of the threshing device 4, an intermediate pulley 128 provided on the intermediate shaft 127, a transmission belt 129 wound around the drive pulley 126 and the intermediate pulley 128, and a waste straw speed change mechanism 130 which changes the speed of the power transmitted to the intermediate shaft 127 and transmits it to the waste straw shredder 8.

[0083] The straw discharge speed change mechanism 130 is provided with two drive pulleys 131, 132 with different winding diameters provided on the intermediate shaft 127 as a drive shaft, two driven pulleys 133, 134 with different winding diameters provided on the rotating shaft 8a of the straw shredder 8 as a driven shaft, and a speed change transmission belt 135 wound around the drive pulleys 131, 132 and the driven pulleys 133, 134. The straw discharge speed change mechanism 130 is configured to change the speed of the power transmitted from the counter shaft 89 by switching the speed change transmission belt 135.

[0084] In other words, like the working unit transmission mechanism 95, the straw discharge transmission mechanism 130 can change the speed of the power output from the counter shaft 89 by switching the speed change transmission belt 135 between a first transmission state (see Figures 12, 13, and 15) in which the speed change transmission belt 135 is wound around a large diameter driving pulley 131 (an example of one of the driving pulleys) and a small diameter driven pulley 133 (an example of one of the driven pulleys), and a second transmission state (see Figure 16) in which the speed change transmission belt 135 is wound around a small diameter driving pulley 132 (an example of the other driving pulley) and a large diameter driven pulley 134 (an example of the other driven pulley).

[0085] In a normal use state where the guide plate 60 approaches the rotary blade 62, the rotary blade 62 is switched to a first transmission state in which it rotates at a high speed. On the other hand, in a non-use state where the guide plate 60 is separated from the rotary blade 62, shredding is not performed, so the rotary blade 62 is switched to a second transmission state in which it rotates at a low speed.

[0086] [Another embodiment] Other embodiments are listed below.

[0087] The guide plate 60 may be configured to be able to change the distance between itself and the outer end rotation path Q of the rotary blade 62 in the guide path along which the discharged straw is guided downward by translation.

[0088] A manual operating device (receiving device) 81 for switching the guide plate 60 between a state approaching the rotary blade 62 and a state away from the rotary blade 62 may be provided inside the straw discharge cover 59.

[0089] The fixed blade 61 may be configured so that the amount of upward projection from the guide plate 60 is kept constant.

[0090]

[0091] A gap may be provided between the relay plate 65 and the guide plate 60, or the relay plate 65 may not be provided. [Industrial Applicability]

[0092] The present invention can be applied to head-feeding combine harvesters as well as normal combine harvesters. [Explanation of symbols]

[0093] 4. Threshing Equipment 8. Waste straw shredding device 26 Handling Body 33 Receiving net 34 Processing Space 59 Straw discharge case (casing) 60 Signboard 61 Fixed blade 62 Rotary Blade 65 Relay Board 81 Receiving device (manual operation device) P6 Horizontal axis P8 Horizontal axis Q Outer end rotation path

Claims

1. The present invention is provided with a threshing device in which a threshing space is formed between the threshing drum and a receiving net provided below the threshing drum, and a waste straw shredding device provided behind the threshing device for shredding the waste straw discharged from the threshing device after threshing. The waste straw shredding device is provided with a guide plate that guides the waste straw discharged from the rear end of the treatment space downward and rearward, a plurality of fixed blades that protrude upward from the guide plate, and a plurality of rotary blades that are positioned above the guide plate and rotate around a horizontal axis to cut the waste straw in cooperation with the fixed blades, The guide plate is configured to be able to change the distance between the guide plate and the outer end rotation path of the rotary blade in the guide path along which the waste straw is guided downward by moving in the approaching / moving direction between the guide plate and the outer end rotation path of the rotary blade, A combine harvester in which the end of the guide plate on the treatment space side extends to a position higher than the height of the rotation shaft of the rotary blade.

2. The combine harvester according to claim 1 , wherein the guide plate is configured to move in the approaching and separating directions by swinging about a lateral axis provided at an upper portion of the guide plate.

3. A casing is provided to cover the sides and the top of the waste straw shredding device, 3. The combine harvester according to claim 1, further comprising a manual operating device provided on a lateral outer side of the casing for switching the guide plate between a state in which the guide plate approaches the rotary blade and a state in which the guide plate is separated from the rotary blade.

4. The fixed blade is supported so as to be vertically adjustable in position so that the amount of upward projection from the guide plate can be changed, A combine harvester as described in claim 1 or 2, wherein when the fixed blade is adjusted to the lowest position, it does not cut the straw regardless of the position of the guide plate within the entire range of its movement stroke in the approaching / moving direction.

5. A combine as described in claim 1 or 2, which is provided with a relay plate in a fixed position for guiding discharged straw from the rear end of the handling space toward the end of the guide plate facing the handling space.

6. The combine harvester according to claim 5, wherein the relay plate and the guide plate are provided in a continuous state with no gap therebetween.

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