combine

Abstract

To provide a combine-harvester which can easily open a waste straw conveyance device.SOLUTION: In a combine-harvester, a waste straw conveyance device 12 is provided so as to intersect an oscillation shaft core Y2 in the plan view. A conveyance start end side portion located on a conveyance start end side and a conveyance terminal side portion located on a conveyance terminal side relative to the oscillation shaft core Y2 in the waste straw conveyance device 12 are configured to be vertically oscillatable around the oscillation shaft core Y2 together with a waste straw frame 50. When a conveyance start end part of the conveyance start end side portion ascends, the conveyance terminal part of the conveyance terminal side portion descends.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a combine harvester equipped with a feed chain that clamps and transports harvested stalks, a threshing device that threshes the harvested stalks transported by the feed chain using a threshing drum, and a straw waste transporting device that is connected to the rear of the threshing device and receives the straw waste after threshing from the feed chain and clamps and transports it rearward. [Background technology]

[0002] As such a combine harvester, for example, the combine harvester described in Patent Document 1 is already known. The combine harvester described in Patent Document 1 includes a feed chain (referred to as a "threshing feed chain" in the document) that clamps and transports the harvested stalks, a threshing device (referred to as a "thresher" in the document) that threshes the harvested stalks transported by the feed chain with a threshing drum (referred to as a "threshing drum" in the document), and a straw discharge conveying device (referred to as a "straw discharge conveying device" in the document) that is connected to the rear of the threshing device and receives the straw discharged from the feed chain after the threshing process and clamps and transports it to the rear. Above the threshing drum, an upper cover (referred to as a "threshing drum cover" in the document) that covers the threshing drum from above is provided. The upper cover is configured to swing open and closed with one side of the threshing chamber as a fulcrum. The straw discharge conveying device is configured to swing open and closed up and down with a pivot shaft in the forward and backward directions as a fulcrum. With this configuration, the upper cover and the straw waste transport device can be opened by swinging them upwards, respectively, making maintenance work easy to perform. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-50339 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the combine harvester described in Patent Document 1, the upper cover and the straw discharge transport device must be opened separately, and the opening must be done manually, which is time-consuming.

[0005] In view of the above situation, there is a demand for a combine harvester in which the upper cover and the straw waste transport device can be easily opened. [Means for solving the problem]

[0006] The present invention is characterized by: A feed chain that holds and conveys the harvested stalks; A threshing device that threshes the harvested stalks transported by the feed chain using a threshing drum; A straw conveying device that is connected to the rear side of the threshing device and receives the straw after the threshing process from the feed chain and conveys it to the rear. A straw discharge frame is provided that supports the straw discharge conveying device and can swing up and down around a swing axis extending in the fore-and-aft direction of the machine body between a lowered position where the straw discharge conveying device transports straw and an elevated position where the straw discharge conveying device does not transport straw. The straw discharge conveying device is provided with a straw discharge rail that does not swing up and down around the swing axis, The straw conveying device is provided so as to intersect with the swing axis in a plan view, The straw waste conveying device is configured such that a conveying start side portion located on the conveying start side of the swing axis and a conveying end side portion located on the conveying end side of the swing axis can swing up and down around the swing axis together with the straw waste frame, and is configured such that when the conveying start end of the conveying start side portion rises, the conveying end portion of the conveying end side portion descends. Further, in the present invention, It is preferable that an actuator is provided for swinging the straw discharge frame upward.

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[0022] [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a left side view showing a head-feeding combine harvester. [Diagram 2] FIG. 2 is a plan view showing a head-feeding combine harvester. [Diagram 3] FIG. 2 is a left side view showing the threshing device. [Figure 4] A rear view showing the threshing device with the upper frame lowered. [Diagram 5] A rear view showing the threshing device with the upper frame raised. [Figure 6] This is a plan view showing the rear of the threshing device and the straw removal and conveying device. [Figure 7] This is a left side view showing the rear of the threshing device and the straw waste conveying device with the upper frame and straw waste frame lowered. [Figure 8] This is a rear view showing the structure behind the threshing device with the upper frame and straw discharge frame lowered. [Figure 9] This is a rear view showing the structure behind the threshing device with the upper frame and straw discharge frame raised. [Figure 10] This is a rear view showing the straw waste conveying device with the upper frame and straw waste frame lowered. [Figure 11] This is a rear view showing the straw waste conveying device with the upper frame and straw waste frame raised. [Figure 12] This is an exploded oblique view showing the structure of the base end side of the straw discharge frame. [Figure 13] This is a left side view showing the structure of the base end side of the straw discharge frame. [Figure 14] An exploded oblique view showing the upper frame, straw removal frame and rear frame. [Figure 15] FIG. [Figure 16] FIG. 11 is a rear cross-sectional view showing the inner locking mechanism in an engaged state. [Figure 17] FIG. 13 is a rear cross-sectional view showing the inner locking mechanism in a disengaged state. [Figure 18] FIG. 13 is a rear cross-sectional view showing the outer locking mechanism in an engaged state. [Figure 19] FIG. 13 is a rear cross-sectional view showing the outer locking mechanism in a disengaged state. [Figure 20] FIG. [Figure 21] This is a left side view showing the rear of the threshing device and the straw waste conveying device with the upper frame and straw waste frame raised. [Figure 22] This is a left side view showing the rear of the threshing device and the straw waste conveying device with the upper frame raised and the straw waste frame lowered. [Diagram 23] FIG. 4 is a left side cross-sectional view showing the upper rear cover. [Figure 24] FIG. [Diagram 25] This is a diagram showing the maximum lift height and swing angle of the upper frame and straw discharge frame. [Figure 26]A diagram showing the lifting mechanism for the upper frame and straw discharge frame in a first alternative example. [Figure 27] This figure shows the state in which the upper frame and the straw discharge frame have been raised to the same maximum lift height in the first alternative example. [Figure 28] This figure shows the state in which the upper frame and the straw discharge frame have been raised to different lift limit heights in the first alternative example. [Figure 29] A diagram showing the lifting mechanism for the upper frame and straw discharge frame in a second alternative example. [Diagram 30] This figure shows a state in which the upper frame and the straw discharge frame have been raised to the same maximum lift height in a second alternative example. [Diagram 31] This figure shows the state in which the upper frame and the straw discharge frame have been raised to different lift limit heights in a second alternative example. [Diagram 32] FIG. 13 is a rear cross-sectional view of an outer locking mechanism according to another embodiment, showing an engaged state. [Diagram 33] FIG. 13 is a rear cross-sectional view of an outer locking mechanism according to another embodiment, showing a disengaged state. [Diagram 34] FIG. 11 is a perspective view showing a straw discharge frame according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] [Overall configuration of the combine] 1 and 2 show a head-feeding combine harvester. This combine harvester comprises a machine body frame 1 and a traveling device 2 that supports the machine body frame 1. A driver's cabin 3 is provided on the right side of the front part of the machine body. The driver's cabin 3 comprises a driver's section 4 in which the driver sits, and a cabin 5 that covers the driver's section 4. An engine (not shown) is provided below the driver's section 4.

[0025] A harvesting section 6 that harvests crops in the field is provided in front of the driver's cabin 3. A grain storage tank 7 that stores grains is provided behind the driver's cabin 3. A grain discharge device 8 that discharges grains from the grain storage tank 7 is provided. A feed chain 9 that clamps and transports the harvested stalks is provided on the left side of the machine body. A threshing device 10 is provided to the left of the grain storage tank 7. The threshing device 10 threshes the harvested stalks transported by the feed chain 9 with a threshing drum 11. A straw waste transport device 12 is connected to the rear of the threshing device 10. The straw waste transport device 12 receives the straw after threshing from the feed chain 9 and clamps and transports it rearward.

[0026] [Harvesting Department] The harvesting unit 6 is configured for multiple cutting (e.g., six-row cutting). The harvesting unit 6 is equipped with a plurality of (e.g., seven) weed dividing tools 13, a plurality of (e.g., six) lifting devices 14, a cutting device 15, and a transport device 16. The weed dividing tools 13 weed the crops in the field. The lifting devices 14 lift the weeded crops. The cutting devices 15 cut the lifted crops. The transport device 16 transports the cut crops backward toward the threshing device 10.

[0027] [Threshing equipment, etc.] As shown in Fig. 3, a threshing chamber 17 is formed in the upper part of the threshing device 10. A threshing drum 11 is provided in the threshing chamber 17. The threshing drum 11 is rotatable about a rotation axis Y1 extending in the front-rear direction of the machine body. A receiving net 18 is provided below the threshing drum 11. A dust exhaust fan 19 that exhausts dust to the outside is provided behind the threshing chamber 17.

[0028] The lower part of the threshing device 10 is provided with an oscillating sorting device 20 which sifts and sorts the material to be sorted while transporting it to the rear of the machine body, a winnowing machine 21 which blows sorting air to the oscillating sorting device 20, a first collection section 22 which collects the first grains (single grains, etc.), and a second collection section 23 which collects the second grains (grains with stalks, etc.).

[0029] The first recovery section 22 is provided with a first screw 24 that transports the first grains to the right. A lifting device 25 that lifts and transports the first grains to the grain storage tank 7 is interlocked with the right end of the first screw 24.

[0030] The second recovery section 23 is provided with a second screw 26 that transports the second grains to the right. A second return device 27 that returns the second grains to the oscillating sorting device 20 is interlocked with the right end of the second screw 26.

[0031] A straw cutting device 28 that cuts the straw transported by the straw transport device 12 is provided below the rear of the straw transport device 12. A cover 29 is provided to cover the straw cutting device 28. A switching plate 29a is provided in a portion of the cover 29 located above the straw cutting device 28. The switching plate 29a can be swung open and closed around a swing axis extending in the left-right direction of the machine body between a cutting position on the upward side and a non-cutting position on the downward side. When the switching plate 29a is open (in the cutting position), the straw transported by the straw transport device 12 is fed into the straw cutting device 28. When the switching plate 29a is closed (in the non-cutting position), the straw transported by the straw transport device 12 slides over the top surface of the switching plate 29a and falls to the ground.

[0032] As shown in Figs. 3 to 7, walls 30 are provided at the front and rear ends of the handling chamber 17. The front wall 30 constitutes the front wall of the handling chamber 17. The rear wall 30 constitutes the rear wall of the handling chamber 17. The walls 30 include a movable wall 31 and a fixed wall 32. The movable wall 31 supports the handling drum 11 rotatably via a handling drum shaft 11a. A connecting arm 33 is provided between the movable wall 31 and the fixed wall 32 to connect them. The movable wall 31 is supported by the fixed wall 32 via the connecting arm 33 so as to be vertically swingable about a swing axis Y2 extending in the fore-and-aft direction of the machine body. A transmission shaft 34 to which the power of the engine is transmitted is provided between the front fixed wall 32 and the rear fixed wall 32.

[0033] The right side of the threshing device 10 is formed by a right side wall 35. The right side wall 35 extends to the rear end of the machine body. The right side wall 35 has an inclined portion 35a. The inclined portion 35a is inclined rearward from the rear wall portion 30 so as to be positioned toward the center of the machine body in the lateral direction as it approaches the rear.

[0034] The threshing device 10 is provided on both the left and right sides with longitudinal frames 36L and 36R extending in the longitudinal direction of the machine body. The left longitudinal frame 36L extends rearward beyond the rear end of the threshing drum 11. The left longitudinal frame 36L is made of a rectangular pipe having a substantially square cross section. The right longitudinal frame 36R extends rearward beyond the rear end of the threshing drum 11. The right longitudinal frame 36R supports the front fixed wall 32, the rear fixed wall 32, and the right side wall 35. The right longitudinal frame 36R is made of a rectangular pipe having a substantially rectangular cross section (a horizontally elongated substantially rectangular shape).

[0035] [Rear frame] A rear frame 37 is provided at the upper rear part of the machine body. The rear frame 37 is located on the outer side of the machine body in the left-right direction of the machine body of the threshing device 10. The rear frame 37 is formed in a substantially U-shape protruding rearward from the rear part of the threshing device 10 in a side view. The rear frame 37 is formed of a round pipe.

[0036] [Upper cover] An upper cover 38 is provided to cover the threshing drum 11 from above. The upper cover 38 extends rearward of the rear end of the threshing drum 11 to above the rear of the straw discharged transport device 12. An upper right cover 39 is provided to the right of the upper cover 38. The upper right cover 39 extends rearward of the rear end of the threshing drum 11 to above the rear of the straw discharged transport device 12. The upper right cover 39 is supported by the right-side longitudinal frame 36R so as to be able to swing up and down around a swing axis extending in the fore-and-aft direction of the machine body.

[0037] [Upper frame] The upper cover 38 is supported by an upper frame 40. The upper frame 40 can swing up and down around a transmission shaft 34 extending in the fore-and-aft direction of the vehicle. The upper frame 40 is supported by the front wall 30 and the rear wall 30 via the transmission shaft 34 so as to be swingable up and down around a swing axis Y2. The upper frame 40 includes a pair of front and rear movable walls 31 and a left fore-and-aft frame 36L. The left fore-and-aft frame 36L is located on the outer side of the upper frame 40 in the left-and-right direction of the vehicle.

[0038] A hydraulic cylinder 41 is provided to swing the upper frame 40 upward. The hydraulic cylinder 41 is provided across the rear movable wall 31 and the rear fixed wall 32. The hydraulic cylinder 41 is, for example, a double-acting hydraulic cylinder. However, the hydraulic cylinder 41 may be a single-acting hydraulic cylinder.

[0039] [Through cylinder lock mechanism] The threshing drum 11 can be swung upward together with the upper frame 40 by the hydraulic cylinder 41. A threshing drum lock mechanism 42 is provided to hold the threshing drum 11 at a threshing position where the threshing process is performed. The threshing drum lock mechanism 42 includes a pair of front and rear hook plates 43 and a pair of front and rear threshing drum hook pins 44. The hook plates 43 are supported on the front and rear walls 30 so as to be swung around the swing axis Y3 in the front-rear direction of the machine body. The tip of the hook plate 43 is provided with a hook portion 43a that can be engaged with the threshing drum hook pin 44. The hook portion 43a engages with the threshing drum hook pin 44, thereby holding the threshing drum 11 at the threshing position. The engagement of the hook portion 43a with the threshing drum hook pin 44 is released, thereby causing the threshing drum 11 to swung upward together with the upper frame 40 by the hydraulic cylinder 41. A motor M that drives the pair of front and rear hook plates 43 to swing is supported on the rear surface of the rear wall 30. The motor M causes the pair of front and rear hook plates 43 to swing to the engagement side and the disengagement side.

[0040] [Straw removal and transportation device] As shown in Figures 6 and 7, the straw discharge conveying device 12 is inclined so that the rear end is closer to the center of the left and right sides of the machine. The straw discharge conveying device 12 is equipped with a plant base conveying device 45 that clamps and conveys the base side of the straw, and a tip conveying device 46 that engages and conveys the tip side of the straw. The plant base conveying device 45 is equipped with a straw discharge chain 47 with a protrusion 47a, and a straw discharge rail 48. The straw discharge rail 48 is positioned below the straw discharge chain 47, facing the lower path of the straw discharge chain 47. The tip conveying device 46 is equipped with a straw discharge tip chain 49 with tines 49a.

[0041] The straw discharge conveying device 12 is supported by the straw discharge frame 50. The straw discharge conveying device 12 is removable from the straw discharge frame 50. The straw discharge conveying device 12 is suspended and supported by the straw discharge frame 50 via a front stay 51 and a rear stay 52. ​​The straw discharge conveying device 12 is removably fixed to the front stay 51 with bolts. The straw discharge conveying device 12 is removably fixed to the rear stay 52 with bolts.

[0042] The straw conveying space S of the straw conveying device 12 is formed behind the rear wall 30. The straw conveying space S is formed to straddle the straw conveying frame 50 in the front-rear direction of the machine body. In a plan view, the straw conveying space S expands so that the downstream side in the conveying direction is located toward the center of the left and right sides of the machine body at the midpoint of the front-rear part of the straw conveying space S (the part corresponding to the front end of the inclined part 35a).

[0043] [Belt transmission mechanism] As shown in Figures 6, 8 and 9, a belt transmission mechanism 53 is provided between the transmission shaft 34 and the straw waste conveying device 12 to transmit the power of the transmission shaft 34 to the straw waste conveying device 12. The belt transmission mechanism 53 includes a driving pulley 54, a driven pulley 55, and a transmission belt 56. The driving pulley 54 is fixed to a portion of the transmission shaft 34 that protrudes rearward from the rear fixed wall 32. The driven pulley 55 is fixed to the input shaft (not shown) of the straw waste conveying device 12. The transmission belt 56 is wound around the driving pulley 54 and the driven pulley 55.

[0044] [Tension clutch mechanism] A tension clutch mechanism 57 is provided to switch the belt transmission mechanism 53 between a transmission state in which power is transmitted to the straw discharge conveying device 12 and a cut-off state in which power transmission to the straw discharge conveying device 12 is cut off. The tension clutch mechanism 57 includes a first tension arm 58, a first tension roller 59, a second tension arm 60, a second tension roller 61, and a tension spring 62. The first tension arm 58 is rotatably supported by the transmission shaft 34. The first tension roller 59 is rotatably supported at the tip of the first tension arm 58. The first tension roller 59 is in contact with the portion of the transmission belt 56 corresponding to the lower path from above. The base end of the first tension arm 58 is provided with an attachment portion 63 to which the tension spring 62 is attached.

[0045] The second tension arm 60 is fixed to the first tension arm 58 so as to be rotatable integrally with the first tension arm 58. A second tension roller 61 is rotatably supported at the tip of the second tension arm 60. The second tension roller 61 contacts a portion of the transmission belt 56 corresponding to the upper path from above.

[0046] The tension spring 62 biases the first tension arm 58 and the second tension arm 60 to swing in the tension application direction around the swing axis Y2. The end of the tension spring 62 opposite the mounting portion 63 is attached to a rod 64. The rod 64 is supported by a stay 65 so that its position can be adjusted. The stay 65 is fixed (for example, welded) to the straw disposal frame 50 (front frame 67). The biasing force of the tension spring 62 changes by adjusting the position of the rod 64 relative to the stay 65.

[0047] [Straw removal frame] As shown in Figures 6 to 11, the straw discharge frame 50 supports the front and rear of the straw discharge conveying device 12 via the front stay 51 and the rear stay 52. ​​The straw discharge frame 50 is formed in a frame shape. The straw discharge frame 50 includes a base end frame 66, a front frame 67, a rear frame 68, and a free end frame 69. The front frame 67, the rear frame 68, and the free end frame 69 are formed by bending a single round pipe. The front part of the straw discharge conveying device 12 is supported by the free end frame 69 via the front stay 51. The rear part of the straw discharge conveying device 12 is supported by the part of the rear frame 68 on the left-right center side of the machine body via the rear stay 52.

[0048] The straw discharge frame 50 can swing up and down around the swing axis Y2 between a lowered position where the straw discharge conveying device 12 conveys straw and an elevated position where the straw discharge conveying device 12 does not convey straw. The straw discharge frame 50 can swing up and down around a support shaft 70 extending in the fore-and-aft direction of the machine body. A pair of front and rear gas dampers 71 are provided to swing the straw discharge frame 50 upward. The gas dampers 71 are provided between the straw discharge frame 50 (front frame 67) and the lower stay 72. An upper stay 73 to which the gas damper 71 is connected is fixed (for example, welded) to the front frame 67.

[0049] As shown in Figures 12 to 14, the base end frame 66 is provided on the base end side of the straw discharge frame 50 and extends in the fore-and-aft direction of the machine body. The base end frame 66 includes a front frame portion 74 constituting the front side, a rear frame portion 75 constituting the rear side, and a connecting frame portion 76 spanning the front frame portion 74 and the rear frame portion 75. The front side portion of the base end frame 66 (front frame portion 74) is supported by the support shaft 70 via a pair of front and rear stays 77.

[0050] A step portion 66a that drops downward is formed in a portion of the base end frame 66 that corresponds to the connecting frame portion 76. The connecting frame portion 76 includes a grooved plate 78 that opens downward, and a connecting plate 79. The grooved plate 78 is provided across the lower surface of the front frame portion 74 and the lower surface of the rear frame portion 75. A connecting plate 79 is provided inside the grooved plate 78, spanning the left and right side walls of the grooved plate 78 and connecting them.

[0051] The front frame 67 is connected to the front end of the base frame 66 and extends from the support shaft 70 side toward the outside of the machine body in the left-right direction of the machine body. The rear frame 68 is connected to the rear end of the base frame 66 and extends from the support shaft 70 side toward the outside of the machine body in the left-right direction of the machine body.

[0052] The free end frame 69 is provided on the free end side of the straw discharge frame 50 and extends in the fore-aft direction of the machine body. The free end frame 69 is connected to the end of the front frame 67 on the outer side of the machine body in the left-right direction of the machine body and the end of the rear frame 68 on the outer side of the machine body in the left-right direction of the machine body. In the lowered position, the free end frame 69 extends along the left fore-aft frame 36L and is adjacent to the left fore-aft frame 36L while being located to the right of the left fore-aft frame 36L.

[0053] The support shaft 70 is a shaft separate from the transmission shaft 34, and is supported by the right-side longitudinal frame 36R that supports the transmission shaft 34. The transmission shaft 34 and the support shaft 70 are arranged on the same axis (swing axis Y2). The support shaft 70 is arranged forward of the longitudinal midpoint of the straw waste transport space S (a location corresponding to the front end of the inclined portion 35a). The right-side longitudinal frame 36R extends rearward beyond the support shaft 70. The support shaft 70 is supported by a bracket 81 via a pair of front and rear stays 80. The bracket 81 is vertically installed on the underside of the right-side longitudinal frame 36R. The stay 80 is fixed to the bracket 81 with a bolt. The lower stay 72 is supported by the front stay 80.

[0054] [Positioning mechanism] As shown in Figure 14, a positioning mechanism 82 is provided for positioning the free end side (free end frame 69) of the straw discharge frame 50 on the rear frame 37 so that the straw discharge frame 50 does not shift position (shift in the fore-aft direction of the machine body, etc.) when the straw discharge frame 50 is in the lowered position. The positioning mechanism 82 includes a claw portion 83 and an insertion portion 84 into which the claw portion 83 is inserted. The claw portion 83 is supported on the free end frame 69 via a stay 85. The claw portion 83 is removably fixed to the stay 85 by a bolt 86. The insertion portion 84 is fixed (for example, by welding) to the rear frame 37. When the claw portion 83 is inserted into the insertion portion 84, the free end side (free end frame 69) of the straw discharge frame 50 is positioned on the rear frame 37 so that the straw discharge frame 50 does not shift in position (in the fore-and-aft direction of the body, etc.) when the straw discharge frame 50 is in the lowered position.

[0055] [Connection mechanism] As shown in Figs. 14 and 15, a connecting mechanism 87 is provided to connect the upper frame 40 (left front-rear frame 36L) and the straw discharge frame 50 (free end frame 69) in a detachable manner. The connecting mechanism 87 can connect the left front-rear frame 36L and the end (free end frame 69) of the straw discharge frame 50 on the outer side of the machine body in the left-right direction of the machine body. The connecting mechanism 87 is provided across the upper part of the left front-rear frame 36L and the upper part of the free end frame 69. The connecting mechanism 87 includes an upper side fixing bracket 88, a straw discharge side fixing bracket 89, and a connecting bracket 90. The upper side fixing bracket 88 is fixed (for example, fixed by welding) to the left front-rear frame 36L. The straw discharge side fixing bracket 89 is fixed (for example, fixed by welding) to the front part of the free end frame 69. The connecting bracket 90 is provided across the upper surface of the upper fixed bracket 88 and the upper surface of the straw discharge side fixed bracket 89. The connecting bracket 90 is connected to each of the upper fixed bracket 88 and the straw discharge side fixed bracket 89 by bolts 91 in a manner that allows the connecting mechanism 87 to be disconnected from each of the left front-rear frame 36L and the free end frame 69.

[0056] [Inner lock mechanism] As shown in Figures 16 and 17, an inner locking mechanism 92 is provided to hold the base end side (base end frame 66) of the straw discharge frame 50 in position on the right-side front-rear frame 36R when the straw discharge frame 50 is in the lowered position. The inner locking mechanism 92 holds the rear part of the base end frame 66 in position on the right-side front-rear frame 36R. The inner locking mechanism 92 includes an inner hook 93 and an inner hook pin 94.

[0057] The inner hook 93 is removably fixed by a bolt 95 to the right side wall of the connecting frame portion 76 (channel plate 78) of the base end frame 66. The inner hook 93 has a pair of front and rear hook portions 93a. A connecting plate 93b is provided between the front hook portion 93a and the rear hook portion 93a to connect them.

[0058] The inner hook pin 94 is supported on the right longitudinal frame 36R via a first stay 96 and a second stay 97. The first stay 96 is fixed (for example, by welding) to the right longitudinal frame 36R. The second stay 97 is removably fixed to the first stay 96 by a bolt 98. The inner hook pin 94 is provided across the front wall portion and the rear wall portion of the second stay 97.

[0059] [Operation of the inner locking mechanism] The inner locking mechanism 92 engages with the right-side forward-backward frame 36R as the straw discharge frame 50 swings toward the lowered position, and releases the engagement with the right-side forward-backward frame 36R as the straw discharge frame 50 swings toward the raised position.

[0060] In detail, as the straw discharge frame 50 swings to the lowered position, the inner hook 93 engages with the inner hook pin 94. Then, as the straw discharge frame 50 swings to the raised position, the engagement of the inner hook 93 with the inner hook pin 94 is released. Here, when the straw discharge frame 50 swings from the lowered position to the raised position, the inner hook pin 94 enters the step portion 66a. This prevents the base end frame 66 from interfering with the inner hook pin 94 when the straw discharge frame 50 swings up and down.

[0061] [External locking mechanism] As shown in Figures 18 and 19, an outer locking mechanism 100 is provided to hold the free end side (free end frame 69) of the straw discharge frame 50 in position on the rear frame 37 when the straw discharge frame 50 is in the lowered position. The outer locking mechanism 100 includes an outer hook 101 and an outer hook pin 102. The outer hook 101 includes a base 101a and a hook portion 101b. The hook portion 101b is removably fixed to the base 101a by a bolt 103.

[0062] The outer hook pin 102 is disposed to the left of the rear frame 37 and at a position slightly away from the rear frame 37. The outer hook pin 102 is supported by the rear frame 37 via a first stay 104 and a second stay 105 (see FIG. 14).

[0063] The outer locking mechanism 100 holds the rear of the left front-rear frame 36L in position on the rear frame 37. The left front-rear frame 36L and the rear frame 37 are connected by the outer locking mechanism 100 in a manner that allows them to be disconnected. When the left front-rear frame 36L and the rear frame 37 are connected by the outer locking mechanism 100, the rear frame 37 is located to the right of the left front-rear frame 36L. That is, the rear frame 37 has a portion that is adjacent to the left front-rear frame 36L when connected to the left front-rear frame 36L by the outer locking mechanism 100. When the left front-rear frame 36L and the rear frame 37 are connected by the outer locking mechanism 100, the free end frame 69 is in contact with the rear frame 37 in the up-down direction. Specifically, with the left front-rear frame 36L and the rear frame 37 connected by the outer locking mechanism 100, the free end frame 69 contacts the rear frame 37 from above. In other words, the free end frame 69 is sandwiched vertically between the rear frame 37 and the connecting mechanism 87 (straw discharge side fixed bracket 89) (sandwich structure).

[0064] [Link mechanism] As shown in Figures 6 to 9, a link mechanism 106 is provided that interlocks and connects the handling cylinder lock mechanism 42 (rear hook plate 43) and the outer lock mechanism 100 (outer hook 101). The link mechanism 106 includes a first link arm 107, a second link arm 108, and a link rod 109. The first link arm 107 is connected to a base end of the rear hook plate 43 so as to be able to swing relative to one another. The first link arm 107 and the second link arm 108 are connected to be able to swing relative to one another.

[0065] The link rod 109 is supported by the left longitudinal frame 36L via a front stay 110 and a rear stay 111. The link rod 109 is rotatably supported by the front stay 110 and the rear stay 111. A second link arm 108 is connected to a front end of the link rod 109 so as not to be able to swing relative to the link rod 109. The outer hook 101 is connected to a rear end of the link rod 109 so as not to be able to swing relative to the link rod 109.

[0066] [Lifting operation section] As shown in FIG. 20, a lifting operation unit 112 for lifting operation is provided in the driving unit 4. The lifting operation unit 112 includes a power switch 113, an up switch 114, and a down switch 115. When performing the lifting operation, the up switch 114 and the power switch 113 are pressed simultaneously. The lifting operation is performed only while the up switch 114 and the power switch 113 are pressed simultaneously. When performing the down operation, the down switch 115 and the power switch 113 are pressed simultaneously. The down operation is performed only while the down switch 115 and the power switch 113 are pressed simultaneously. The lifting operation unit 112 may be provided, for example, on the left side of the threshing device 10 in addition to (or instead of) the driving unit 4 so that the operator can operate it from outside the machine.

[0067] [Upper rear cover] As shown in Figures 2, 6, 23 and 24, a rear upper cover 116 is provided to cover the straw discharge conveying device 12 from above and behind. The rear upper cover 116 includes a main body 117 and an upper portion 118.

[0068] The main body 117 has a notch 117a that opens forward. The notch 117a is formed in a horizontally elongated, generally trapezoidal shape in a plan view. The length of the front edge of the notch 117a (the length in the left-right direction of the aircraft body) is longer than the length of the rear edge of the notch 117a (the length in the left-right direction of the aircraft body).

[0069] The upper part 118 is located above the rear of the straw conveying device 12 in the rear upper cover 116. The upper part 118 overlaps with the rear of the straw conveying device 12 in a plan view. The upper part 118 is provided in the cutout 117a so as to close the cutout 117a. The upper part 118 is supported on the main body 117 via a support shaft 119 extending in the left-right direction of the machine body at the rear side of the upper part 118 so as to be able to swing up and down. The upper part 118 can swing up and down between a closed position that closes the straw conveying space S and an open position that opens the straw conveying space S, centered on the support shaft 119 extending in the left-right direction of the machine body at the rear side of the upper part 118.

[0070] [Interlocking mechanism] An interlocking mechanism 120 is provided for swinging the upper part 118 to the open position side in conjunction with the swinging of the straw discharge frame 50 to the raised position side. The interlocking mechanism 120 includes an arm 121 and a roller 122. The arm 121 extends from the straw discharge frame 50 (rear frame 68) to a lower part of the upper part 118. A roller 122 capable of contacting the contact part 126c from below is provided at the tip of the arm 121. The roller 122 is rotatable around a rotation axis extending in the fore-and-aft direction of the machine body. The arm 121 is removably fixed to the arm stay 123 by a bolt 124. The arm stay 123 is fixed (for example, by welding) to the rear frame 68.

[0071] A main body stay 125 is fixed to the inner surface of the main body 117 with bolts. An upper portion stay 126 is fixed (for example, by welding) to the inner surface of the upper portion 118. A support shaft 119 is provided across the main body stay 125 and the upper portion stay 126. The upper portion stay 126 includes a pair of left and right support portions 126a that support the support shaft 119, an attachment portion 126b to which the spring 127 is attached, and a contact portion 126c with which the roller 122 can come into contact. The contact portion 126c is formed of a plate-shaped portion that extends in the left-right direction of the machine body along the inner surface of the upper portion 118.

[0072] A spring 127 is provided to bias the upper portion 118 to swing toward the closed position. The spring 127 is provided across the upper portion 118 and the main body portion 117. An end of the spring 127 on the upper portion 118 side is attached to the attachment portion 126b. The main body portion 117 is provided with an attachment portion 128 to which the spring 127 is attached. An end of the spring 127 on the main body portion 117 side is attached to the attachment portion 128.

[0073] Upper portion 118 is formed to have a shape slightly larger than notch 117a in plan view. An edge of upper portion 118 abuts from above against an edge of main body 117 corresponding to notch 117a, thereby preventing upper portion 118 from swinging downward from the closed position. That is, the edge of upper portion 118 and the edge of main body 117 corresponding to notch 117a form a blocking portion 129 that prevents upper portion 118 from swinging downward from the closed position.

[0074] [Lifting and lowering operation of the upper frame and straw discharge frame] 8 and 9, when an operator performs an upward operation using the lifting operation unit 112, the pair of front and rear hook plates 43 are swung toward the disengagement side by the motor M. This disengages the hook plate 43 (hook portion 43a) from the handling cylinder hook pin 44. Then, in conjunction with the swinging of the rear hook plate 43 toward the disengagement side, the outer hook 101 is swung toward the disengagement side.

[0075] In the connected state in which the upper frame 40 and the straw discharge frame 50 are connected by the connecting mechanism 87, as shown in Figures 9 and 21, when the engagement of the outer hook 101 with the outer hook pin 102 is released, the upper frame 40 and the straw discharge frame 50 are swung upward by the hydraulic cylinder 41. At that time, together with the upper frame 40 and the straw discharge frame 50, the handling drum 11, the belt transmission mechanism 53, and the tension clutch mechanism 57 are also swung upward by the hydraulic cylinder 41. Therefore, the positional relationship of the pulleys (drive pulley 54, driven pulley 55) in the belt transmission mechanism 53 does not change.

[0076] Then, following the swinging of the straw discharge frame 50 toward the raised position, the engagement of the inner hook 93 with the inner hook pin 94 is released. Thus, the upper frame 40 and the straw discharge frame 50 rise together to the same upper limit height.

[0077] In addition, when the straw discharge frame 50 swings to the raised position side, the arm 121 pushes up the upper part 118 via the roller 122 in conjunction with the swinging of the straw discharge frame 50 to the raised position side. Thus, in conjunction with the swinging of the straw discharge frame 50 to the raised position side, the upper part 118 swings to the open position side.

[0078] When the operator performs the lowering operation using the lifting operation unit 112, the upper frame 40 and the straw discharge frame 50 are swung downward with the contraction of the hydraulic cylinder 41. Then, following the swinging of the straw discharge frame 50 to the lowered position side, the inner hook 93 engages with the inner hook pin 94.

[0079] When the upper frame 40 and the straw discharge frame 50 are in the lowered position, the pair of front and rear hook plates 43 are swung toward the engagement side by the motor M. This causes the hook plate 43 (hook portion 43a) to engage with the threshing body hook pin 44. In conjunction with the swing of the rear hook plate 43 toward the engagement side, the outer hook 101 is swung toward the engagement side.

[0080] On the other hand, when the upper frame 40 and the straw discharge frame 50 are disconnected (disconnected state), as shown in FIG. 22, when the outer hook 101 is disengaged from the outer hook pin 102, only the upper frame 40 of the upper frame 40 and the straw discharge frame 50 is swung upward by the hydraulic cylinder 41. At that time, the handling drum 11 and the tension clutch mechanism 57 are also swung upward by the hydraulic cylinder 41 together with the upper frame 40. When only the upper frame 40 of the upper frame 40 and the straw discharge frame 50 is to be swung upward, it is necessary to remove the transmission belt 56 from the drive pulley 54 in advance. In this way, only the upper frame 40 of the upper frame 40 and the straw discharge frame 50 rises to the upper limit height.

[0081] The straw discharge frame 50 is then swung upward by the gas damper 71, so that the straw discharge frame 50 rises to the upper limit height. As described above, the straw discharge conveying device 12 is removable from the straw discharge frame 50. If the straw discharge conveying device 12 is removed from the straw discharge conveying device 12, only the straw discharge frame 50 can be swung upward.

[0082] Next, using Figures 25 to 31, we will explain an embodiment that can be switched between a state in which the upper frame 40 and the straw discharge frame 50 can be raised together to the same lifting limit height (hereinafter referred to as the "first mode"), and a state in which the upper frame 40 and the straw discharge frame 50 can be raised to different lifting limit heights (hereinafter referred to as the "second mode").

[0083] As shown in Fig. 25, in the first mode, the upper frame 40 and the straw discharge frame 50 are set to the same upper limit height H1. The upper frame 40 and the straw discharge frame 50 are set to the same swing angle α.

[0084] In the second mode, the upper frame 40 and the straw discharge frame 50 are set to different maximum heights. Specifically, the upper frame 40 is set to a maximum height H1, and the straw discharge frame 50 is set to a lower position (maximum height H2) than the maximum height H1. That is, the upper frame 40 is set to a maximum height H1 by the hydraulic cylinder 41 and is set to a higher position than the maximum height H2 by the gas damper 71.

[0085] In addition, the swing angle of the upper frame 40 and the swing angle of the straw discharge frame 50 are set to different swing angles. Specifically, the swing angle of the upper frame 40 is set to a swing angle α, and the swing angle of the straw discharge frame 50 is set to an angle (swing angle β) smaller than the swing angle α.

[0086] In the example shown in Figures 26 to 28, the lifting mechanism for the upper frame 40 and the straw discharge frame 50 includes a hydraulic cylinder 41 that swings the upper frame 40 upward, a gas damper 71 that swings the straw discharge frame 50 upward, and a connecting mechanism 87 that connects the upper frame 40 and the straw discharge frame 50 so that they can be disconnected. In the example shown in Figures 26 to 28, the connecting mechanism 87 functions as a switching mechanism that switches between the first mode and the second mode. Figure 26 shows the upper frame 40 and the straw discharge frame 50 in the lowered position.

[0087] 27, in the first mode, the upper frame 40 and the straw discharge frame 50 are connected by a connection mechanism 87 (connected state). In this connected state, the upper frame 40 and the straw discharge frame 50 are swung upward by the hydraulic cylinder 41 so that the upper frame 40 and the straw discharge frame 50 rise together to the same lift limit height H1.

[0088] In this case, by disconnecting the gas damper 71 from the straw discharge frame 50 in advance, the gas damper 71 will not be damaged even if the straw discharge frame 50 rises to the lift limit height H1, exceeding the maximum extension length of the gas damper 71 (corresponding to the lift limit height H2).

[0089] 28, in the second mode, the upper frame 40 and the straw discharge frame 50 are disconnected (disconnected state). In this disconnected state, the upper frame 40 is swung upward by the hydraulic cylinder 41 so that the upper frame 40 rises to the lift limit height H1.

[0090] The straw discharge frame 50 can be swung upward by the gas damper 71 so that the straw discharge frame 50 rises to the maximum lift height H2.

[0091] 29 to 31, the upper frame 40 may be provided with a pressing portion 40a that presses the straw discharge frame 50 from above, and the straw discharge frame 50 may be placed on the end of the gas damper 71 on the straw discharge frame 50 side so that the frame can be separated upward from the gas damper 71. In the example shown in Fig. 29 to 31, the connecting mechanism 87 also functions as a switching mechanism that switches between the first mode and the second mode. Fig. 29 shows the upper frame 40 and the straw discharge frame 50 in the lowered position.

[0092] As shown in Fig. 30, in the first mode, the upper frame 40 and the straw discharge frame 50 are connected by a connection mechanism 87 (connected state). In this connected state, the upper frame 40 and the straw discharge frame 50 are swung upward by the hydraulic cylinder 41 so that the upper frame 40 and the straw discharge frame 50 rise together to the same lift limit height H1.

[0093] At this time, as described above, since the straw discharge frame 50 is placed on the end of the gas damper 71 on the straw discharge frame 50 side so as to be movable upward relative to the gas damper 71, when the straw discharge frame 50 rises beyond the maximum extension length (corresponding to the rising limit height H2) of the gas damper 71, the straw discharge frame 50 moves upward relative to the gas damper 71. As a result, even if the straw discharge frame 50 rises to the rising limit height H1 beyond the maximum extension length (corresponding to the rising limit height H2) of the gas damper 71, the gas damper 71 will not be damaged.

[0094] As shown in Fig. 31, in the second mode, the upper frame 40 is disconnected from the straw discharge frame 50 (disconnected state). In this disconnected state, the upper frame 40 is swung upward by the hydraulic cylinder 41 so that the upper frame 40 rises to the lift limit height H1.

[0095] The straw discharge frame 50 can be swung upward by the gas damper 71 so that the straw discharge frame 50 rises to the maximum lift height H2.

[0096] Thereafter, when the upper frame 40 descends, the holding portion 40a presses down on the straw discharge frame 50 from above, causing the gas damper 71 to automatically contract, and the straw discharge frame 50 descends together with the upper frame 40.

[0097] 26 to 28 and the example shown in Fig. 29 to 30, a locking mechanism (not shown) may be provided to hold the straw discharge frame 50 in position on the rear frame 37. As a result, in the second mode, even if the upper frame 40 rises, the straw discharge frame 50 can be held in position on the rear frame 37 by the locking mechanism so that the straw discharge frame 50 does not rise.

[0098] Although not shown, an electric actuator (not shown) may be used as an actuator for vertically swinging the upper frame 40 instead of the hydraulic cylinder 41, and an electric actuator (not shown) may be used as an actuator for vertically swinging the straw discharge frame 50 instead of the gas damper 71. The electric actuator may be either an electric motor or an electric cylinder. In this example, a control device (not shown) that controls the electric actuator is provided with a function for switching between the first mode and the second mode.

[0099] In this example, in the second mode, when the operator performs the lifting operation using the lifting operation unit 112, the upper frame 40 and the straw discharge frame 50 rise to the upper limit height H2, and the upper frame 40 and the straw discharge frame 50 stop at the upper limit height H2. After that, the operator again performs the lifting operation using the lifting operation unit 112, and only the upper frame 40 rises to the upper limit height H1.

[0100] In this example, the lifting / lowering operation unit 112 may be configured as follows: That is, a lifting / lowering operation unit (upward switch, downward switch) for lifting / lowering the upper frame 40 and the straw discharge frame 50 in the first mode, a lifting / lowering operation unit (upward switch, downward switch) for lifting / lowering the upper frame 40 in the second mode, and a lifting / lowering operation unit (upward switch, downward switch) for lifting / lowering the straw discharge frame 50 in the second mode may be provided.

[0101] [Another embodiment] (1) In the above embodiment, the outer locking mechanism 100 is used. Alternatively, the outer locking mechanism 200 may be used.

[0102] As shown in Figs. 32 and 33, the outer lock mechanism 200 includes an outer hook 201, an outer hook arm 202, an outer hook spring 203, and an outer hook pin 102. The outer hook 201 is supported swingably on the rear surface of the rear stay 111 via a support shaft 204. An outer hook spring 203 is provided between the outer hook 201 and the rear surface of the rear stay 111, for biasing the outer hook 201 to swing toward the engagement side. The outer hook arm 202 is fixed to the rear end of the link rod 109. An opening 201a is formed in the outer hook 201. A pin 202a protruding rearward is provided in the outer hook arm 202. The pin 202a is located within the opening 201a. According to this configuration, the outer hook arm 202 engages with the opening 201a via the pin 202a, causing the outer hook pin 102 to swing toward the engagement side. At this time, the biasing force of the outer hook spring 203 allows the outer hook 201 to be quickly engaged with the outer hook pin 102.

[0103] (2) In the above embodiment, the step portion 66a is formed in the base end frame 66. However, as shown in Fig. 34, a portion corresponding to the step portion 66a does not necessarily have to be formed in the base end frame 66. In this case, the vertical position of the inner hook 93 is higher than in the above embodiment, so the vertical position of the inner hook pin 94 may be made higher than in the above embodiment.

[0104] (3) In the above embodiment, if the switching plate 29a is in the open state (cutting position state), the straw discharge frame 50 may be configured to rise after the switching plate 29a is switched to the closed state (non-cutting position state). Also, when the straw discharge frame 50 is in the raised state, the switching plate 29a may not be configured to switch to the open state (cutting position state).

[0105] (4) In the above embodiment, the connecting mechanism 87 extends between the upper part of the left front-to-rear frame 36L and the upper part of the free end frame 69. However, instead of this, the connecting mechanism 87 may extend between the lower part of the left front-to-rear frame 36L and the lower part of the free end frame 69.

[0106] (5) In the above embodiment, the connecting mechanism 87 can be disconnected from each of the left front-to-rear frame 36L and the free end frame 69. However, instead of this, the connecting mechanism 87 may be disconnected from either the left front-to-rear frame 36L or the free end frame 69.

[0107] (6) In the above embodiment, the connecting mechanism 87 connects the left front-rear frame 36L and the free-end frame 69 in a detachable manner. However, instead of this, the connecting mechanism 87 may connect a portion of the upper frame 40 other than the left front-rear frame 36L and a portion of the straw discharge frame 50 other than the free-end frame 69 in a detachable manner.

[0108] (7) In the above embodiment, the handling drum 11 can be swung upward together with the upper frame 40 by the hydraulic cylinder 41. However, instead of this, only the upper frame 40 may be swung upward by the hydraulic cylinder 41.

[0109] (8) In the above embodiment, the connecting mechanism 87 is a bolt-type connecting structure (bolt 91). However, instead of this, the connecting mechanism 87 may be a one-touch type connecting structure using a lever or the like. [Industrial Applicability]

[0110] The present invention can be used not only in combine harvesters with cabins, but also in combine harvesters without cabins. [Explanation of symbols]

[0111] 9 Feed Chain 10 Threshing Equipment 11 Handling body 12 Straw removal and transport device 50 Straw Removal Frame 71 Gas damper (actuator) Y2 Swing axis

Claims

1. A feed chain that holds and conveys the harvested stalks; A threshing device that threshes the harvested stalks transported by the feed chain using a threshing drum; A straw conveying device that is connected to the rear side of the threshing device and receives the straw after the threshing process from the feed chain and conveys it to the rear. A straw discharge frame is provided that supports the straw discharge conveying device and can swing up and down around a swing axis extending in the fore-and-aft direction of the machine body between a lowered position where the straw discharge conveying device transports straw and an elevated position where the straw discharge conveying device does not transport straw. The straw discharge conveying device is provided with a straw discharge rail that does not swing up and down around the swing axis, The straw conveying device is provided so as to intersect with the swing axis in a plan view, A combine harvester in which the straw discharge conveying device has a conveying start side portion located on the conveying start side relative to the swing axis and a conveying end side portion located on the conveying end side relative to the swing axis that are configured to be able to swing up and down around the swing axis together with the straw discharge frame, and which is configured so that when the conveying start end of the conveying start side portion rises, the conveying end portion of the conveying end side portion descends.

2. The combine harvester according to claim 1, further comprising an actuator for swinging the straw discharge frame upward.

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