Threshing device

Abstract

The threshing device is provided with a plurality of fixing parts (80) which fix the adjusting position of the connecting frame (70) to the side part (42A) of the screen box (42) after position adjustment. The plurality of fixing parts (80) are distributed in the direction along the conveying direction of the processed materials screened by the rice husk screen (46).

Description

Technical Field

[0001] The present invention relates to a threshing device, which comprises a threshing part and a screening part, wherein the threshing part comprises: a threshing chamber to which harvested crops are supplied; a threshing cylinder rotatably arranged in the threshing chamber to thresh the supplied crops; and a screen arranged below the threshing cylinder; the screening part comprises: a screen box swingably arranged below the screen; and a chaff screen supported by the screen box, receiving threshed processed materials leaking from the screen as screened processed materials, and screening the received screened processed materials. Background Art

[0002] In the above-mentioned threshing device, for example, as shown in Patent Document 1, the chaff screen has: a plurality of chaff turning plates (screening plates) supported by a screen box and a connecting frame (support frame) connecting the plurality of chaff turning plates; the plurality of chaff turning plates are arranged at intervals along the direction of conveying the screened material of the chaff screen and are capable of changing their postures, and the plurality of chaff turning plates are configured to change their postures by adjusting the position of the connecting frame.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5400566 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Conventionally, the screen box was swung by the swinging operation, so that the connection frame vibrated, and distortion occurred between the connection frame and the chaff turning plate, and the connection frame or the chaff turning plate was easily worn.

[0008] An object of the present invention is to provide a threshing device capable of improving the durability of a connection frame and a chaff turning plate.

[0009] Technical solutions to the problem

[0010] The threshing device of the present invention comprises a threshing part and a screening part, wherein the threshing part comprises: a threshing chamber to which the harvested crops are supplied; a threshing drum rotatably arranged in the threshing chamber to thresh the supplied crops; and a screen disposed below the threshing drum; the screening part comprises: a screen box swung below the screen; and a chaff screen supported by the screen box to receive the threshed processed material leaking from the screen as the screened processed material and to screen the received screened processed material; the chaff screen There are a plurality of chaff turning plates supported by the screen box and a connecting frame connecting the plurality of chaff turning plates; the plurality of chaff turning plates are arranged at intervals along the conveying direction of the screened processed material of the chaff screen and can change their postures, and the plurality of chaff turning plates are configured to change their postures by adjusting the position of the connecting frame, and the threshing device has a plurality of fixing parts that fix the connecting frame to the side of the screen box at the adjusted position after the position adjustment, and the plurality of fixing parts are dispersed in the direction along the conveying direction of the screened processed material.

[0011] According to this structure, a plurality of locations of the connection frame dispersedly arranged along the transfer direction of the chaff screen are fixed to the side of the screen box by the fixing part. Therefore, regardless of the swing of the screen box, the connection frame is not easy to vibrate, and the connection frame and the chaff turning plate are not easy to be twisted, and the connection frame or the chaff turning plate is not easy to wear, thereby improving the durability of the connection frame and the chaff turning plate.

[0012] In the present invention, preferably, the fixed part is respectively arranged in an upstream area of ​​the connecting frame which is located on the upstream side of the screening and processing object transfer direction relative to the central part of the screening and processing object transfer direction, and a downstream area of ​​the connecting frame which is located on the downstream side of the screening and processing object transfer direction relative to the central part.

[0013] According to this structure, compared with the case where the connecting frame is fixed to the side only at one position, the length of the portion of the connecting frame from the portion fixed to the side in the upstream area to the top end of the upstream side in the transfer direction of the screened object and the length of the portion of the connecting frame from the portion fixed to the side in the downstream area to the top end of the downstream side in the transfer direction of the screened object are shortened. Therefore, regardless of the swing of the screen box, the connecting frame is not easy to vibrate, and the connection frame and the chaff turning plate are not easy to be twisted, so that the durability of the connecting frame and the chaff turning plate can be improved.

[0014] In the present invention, preferably, the fixing portion located in the upstream area and the fixing portion located in the downstream area are each capable of being swingably supported by the side portion, and the first fixing portion as one of the fixing portion located in the upstream area and the fixing portion located in the downstream area is composed of a plurality of first positioning holes provided in one of the first fixing portion and the side portion and a first positioning bolt installed in any one of the plurality of first positioning holes selected from the plurality of first positioning holes and connecting the first fixing portion to the side portion, and is positioned at a swing position corresponding to the adjustment position of the connecting frame, and the plurality of first positioning holes are respectively arranged corresponding to the plurality of adjustment positions of the connecting frame, and the second fixing portion as the other of the fixing portion located in the upstream area and the fixing portion located in the downstream area is composed of a second positioning hole in the shape of a long hole provided in one of the second fixing portion and the side portion and a second positioning bolt installed in the second positioning hole and connecting the second fixing portion to the side portion, and is positioned at a swing position corresponding to the adjustment position of the connecting frame.

[0015] According to the present structure, the first fixing part is swung relative to the side portion to be located at a swing position corresponding to the adjustment position of the connection frame, and the first fixing part is connected to the side portion by installing the first positioning bolt in the first positioning hole selected from the plurality of first positioning holes, so that the first fixing part becomes in an active state, and the connection frame is fixed to the side portion by the first fixing part. Since the second positioning hole of the second fixing part is a long hole shape, when the first fixing part is operated, if the connection of the second positioning bolt to the side portion by the second fixing part is released, the second fixing part is located at a swing position corresponding to the adjustment position of the connection frame by the swing of the first fixing part transmitted to the second fixing part via the connection frame. Therefore, even if a special operation for making the second fixing part be in a swing position corresponding to the adjustment position of the connection frame is not performed, the connection frame is fixed to the side portion by the second fixing part at the adjustment position only by operating the second positioning bolt that connects the second fixing part to the side portion. Thus, the connection frame can be fixed to the side portion by the first fixing part and the second fixing part through a simple fixing operation.

[0016] In the present invention, preferably, the first fixing portion is provided in the upstream region, and the second fixing portion is provided in the downstream region.

[0017] According to the present structure, the time and labor required for operating the first fixing part for positioning by selecting the first positioning hole for installing the first positioning bolt from a plurality of first positioning holes is greater than the time and labor required for operating the second fixing part for positioning by swinging in conjunction with the first fixing part. However, by providing a driving mechanism at the downstream side of the screen box in the direction of transfer of the screened material, it is easy to obtain a wider working space on the lateral outer side of the threshing device in the upstream area of ​​the connecting frame than on the lateral outer side of the threshing device in the downstream area of ​​the connecting frame. Moreover, in the present structure, the first fixing part is located in the upstream area of ​​the connecting frame, which is one of the upstream area and the downstream area of ​​the connecting frame, on which a wider working space is easily obtained. Therefore, it is easy to perform the operation of fixing the connecting frame to the side of the screen box using the first fixing part and the second fixing part.

[0018] In the present invention, preferably, there are: a first recovery part, which recovers the first processed material screened by the chaff screen; and a second recovery part, which is arranged on the downstream side of the screened processed material transfer direction compared to the first recovery part, and recovers the second processed material screened by the chaff screen; the first fixing part is arranged above the part between the first recovery part and the second recovery part in the transfer direction of the screened processed material, and the second fixing part is arranged above the second recovery part.

[0019] According to this structure, the length of the front part of the connecting frame from the position where the first fixing part is located to the end on the upstream side in the direction of transferring the screened material, the length of the middle part between the position where the first fixing part is located and the position where the second fixing part is located, and the length of the rear part from the position where the second fixing part is located to the end on the downstream side in the direction of transferring the screened material are not too short or too long. Therefore, regardless of the swing of the screen box, the front part, the middle part, and the rear part of the connecting frame are not easy to vibrate, and the distortion between the connecting frame and the chaff turning plate is not easy to occur, so that the connecting frame or the chaff turning plate is not easy to wear.

[0020] In the present invention, preferably, the husk turning plate is provided with an upper fulcrum shaft and a lower fulcrum shaft, the threshing device is provided with a supporting member, the supporting member is connected to the side portion in a state of being externally embedded in the upper fulcrum shaft, and enables the husk turning plate to be supported by the side portion in a posture changing manner, the connecting frame is externally embedded in the lower fulcrum shaft and connected to the husk turning plate, and the thickness of the supporting member in the direction of the axis core of the upper fulcrum shaft is thicker than the thickness of the connecting frame in the direction of the axis core of the lower fulcrum shaft.

[0021] According to this structure, the upper fulcrum shaft is firmly supported by the support member and is not easy to shake, so that the connecting plate is not easy to vibrate. Therefore, it is not easy to shake between the chaff turning plate and the connecting plate, so that the connecting frame or the chaff turning plate is not easy to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall side view of the combine harvester.

[0023] Figure 2 It is an overall top view of the combine harvester.

[0024] Figure 3 It is a longitudinal sectional side view of the threshing device.

[0025] Figure 4 It is a longitudinal section rear view of the upper part of the threshing device.

[0026] Figure 5 It is a side view of the chaff screen, the first recovery part and the second recovery part in the screening part.

[0027] Figure 6 It is a longitudinal sectional side view of the chaff screen.

[0028] Figure 7 yes Figure 5 VII-VII sectional view.

[0029] Figure 8 yes Figure 5 VIII-VIII sectional view of the invention.

[0030] Fig. 9 yes Figure 5 IX-IX sectional view.

[0031] Fig.10 yes Figure 5 XX cross-sectional view. DETAILED DESCRIPTION

[0032] Hereinafter, a case where an embodiment of the threshing device of the present invention is applied to a threshing device mounted on a general type combine harvester will be described based on the drawings.

[0033] 〔Overall structure〕

[0034] exist Figure 1 and Figure 2, a general type combine harvester for harvesting crops such as rice and wheat is shown. The combine harvester has a traveling body V and a harvesting and conveying unit 3. The traveling body V has a body frame 1 and a pair of left and right crawler traveling devices 2. The crawler traveling device 2 is equipped at the lower part of the body frame 1. The harvesting and conveying unit 3 harvests the standing grain stalks of the crop to be harvested and conveys them to the rear. The harvesting and conveying unit 3 is connected to the front part of the traveling body V in a state that it can be raised and lowered and swung. Moreover, the traveling body V has a threshing device 4, a grain tank 5, a grain discharge device 6, a driving unit 7, etc. on the body frame 1. The threshing device 4 performs a threshing process on the harvested grain stalks of the crop transported from the harvesting and conveying unit 3, and selects the threshed material obtained by the threshing process into grains and stalks. The grain tank 5 stores the grains obtained by 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 operator gets on the driving unit 7 and performs driving operation on the driving unit 7. This combine harvester is a whole-stalk input type that cuts the roots of standing grain stems and harvests, and inputs all the harvested grain stems into the threshing device 4.

[0035] The driving part 7 is located on the right side of the front part of the machine body. There is a grain tank 5 behind the driving part 7. Furthermore, the threshing device 4 is located on the left side, and the grain tank 5 is located on the right side. Thus, the threshing device 4 and the grain tank 5 exist in a state of being arranged in the left-right direction. Moreover, there is an engine 8 for driving the combine harvester below the driving part 7.

[0036] In this embodiment, when defining the front-to-back direction of the machine body, it is defined along the direction in which the machine body is moving in the working state, and when defining the left-right direction of the machine body, it is defined as viewed from the direction in which the machine body is moving. Figure 1 , 2 The direction indicated by the reference numeral (F) is the front side of the machine body. Figure 1 , 2 The direction indicated by the reference numeral (B) is the rear side of the machine body. Figure 2 The direction indicated by the reference numeral (L) is the left side of the machine body. Figure 2 The direction indicated by the reference numeral (R) in the figure is the right side of the machine body. Therefore, the left-right direction of the machine body corresponds to the horizontal width direction of the machine body.

[0037] The harvesting and conveying unit 3 includes a harvesting processing unit 9 and a feeder 10. The harvesting processing unit 9 harvests the standing grain stalks as the machine body travels. The feeder 10 conveys the harvested grain stalks harvested by the harvesting processing unit 9 to the threshing device 4 on the rear side of the machine body. The harvesting and conveying unit 3 is supported to be freely raised and lowered and swung around the horizontal axis core P1 by the hydraulic cylinder 11 for harvesting and lifting mounted on the machine body frame 1 and the feeder 10.

[0038] The harvesting processing unit 9 has a harvesting frame 12, a pair of left and right grain dividers 13, a rotating wheel 14, a cutting knife 15 in the shape of an electric shear, and a grain-pulling auger 16. The harvesting frame 12 is a frame that supports the harvesting processing unit 9 as a whole. The grain divider 13 separates the standing grain stalks that are the harvesting objects and the standing grain stalks that are not the harvesting objects. The rotating wheel 14 pulls the standing grain stalks of the harvesting objects to the rear. The cutting knife 15 cuts off the root side of the standing grain stalks of the harvesting objects to harvest. The grain-pulling auger 16 transports the cut harvested grain stalks horizontally to the middle side in the left-right direction, collects them, and sends them to the rear.

[0039] 〔Threshing device〕

[0040] like Figure 2 As shown, the threshing device 4 is arranged on the left side of the grain tank 5. Figure 3 and Figure 4 As shown, the threshing device 4 is composed of side walls 24 and 25 located on the left and right sides, a front wall 26 located at the front end, and a rear wall 27 located at the rear end. The threshing device 4 has a device body 20 with an open top and a top plate 21 covering the top of the device body 20. Figure 1 , 2 As shown, the threshing device 4 has a threshing device cover 76 that covers the device body 20 from the left outer side in the horizontal direction. Figure 1 As shown, the threshing device cover 76 is divided into a first segmented cover 76a, a second segmented cover 76b, a third segmented cover 76c, and a fourth segmented cover 76d. The first segmented cover 76a is located at the front upper part of the threshing device cover 76. The second segmented cover 76b is further to the rear side than the first segmented cover 76a. The third segmented cover 76c is further to the lower side than the front part of the first segmented cover 76a and the second segmented cover 76b. The fourth segmented cover 76d is further to the rear side than the third segmented cover 76c and further to the lower side than the second segmented cover 76b. The first segmented cover 76a, the second segmented cover 76b, the third segmented cover 76c, and the fourth segmented cover 76d are configured to be able to be opened and closed by loading and unloading, respectively.

[0041] like Figure 3 As shown, the threshing device 4 includes a threshing portion 4A provided at an upper portion of the threshing device 4 and a screening portion 4B provided at a lower portion of the threshing device 4 .

[0042] 〔Threshing Department〕

[0043] like Figure 3As shown, the threshing section 4A has a stripping chamber 28. The stripping chamber 28 is formed in the upper part of the internal space of the device body 20. A stripping cylinder 22 is provided in the stripping chamber 28. The stripping cylinder 22 is driven to rotate around the horizontal axis X1 toward the front and rear of the machine body to strip the crops. The stripping cylinder 22 has a stripping cylinder shaft 31. The stripping cylinder shaft 31 is supported by the front wall portion 26 and the rear wall portion 27 so as to rotate freely around the horizontal axis X1. The stripping cylinder 22 is configured to include the stripping cylinder shaft 31, and the entire stripping cylinder 22 rotates integrally around the stripping cylinder shaft 31. The stripping cylinder shaft 31 is driven to rotate by power from the engine 8. The stripping cylinder 22 is driven to rotate rightward when the machine body is viewed from the front (i.e., clockwise when the machine body is viewed from the front). Figure 4 The direction of rotation is indicated by arrow K).

[0044] like Figure 3 As shown, the stripping cylinder 22 has a gathering portion 22A provided at the front of the stripping cylinder 22 and a stripping processing portion 22B provided at the rear side compared to the gathering portion 22A. The rear portion of the gathering portion 22A is connected to the front portion of the stripping processing portion 22B. The stripping processing portion 22B has a plurality of support plates 32, a plurality of support rods 33, and rod-shaped stripping teeth 34. The plurality of support plates 32 are formed in a circular plate shape and are connected and fixed to the stripping cylinder shaft 31 so as to rotate freely as a whole. The plurality of support rods 33 are dispersed and arranged at equal intervals in the circumferential direction of the stripping cylinder 22 and are respectively connected to each support plate 32. The stripping teeth 34 protrude toward the outer peripheral side of the stripping cylinder 22 from a plurality of locations arranged in the axial direction of each support rod 33.

[0045] There is an arc-shaped screen 23 below the stripping cylinder 22. Although not described in detail, the screen 23 is composed of a plurality of arc-shaped horizontal bars and a plurality of vertical bars along the axial direction and connecting the horizontal bars. Thus, the screen 23 is formed into a mesh body of a known structure with a plurality of through holes for grains to pass through.

[0046] The stripping chamber 28 is formed by the side walls 24, 25, the front wall 26 and the rear wall 27 of the device body 20, the top plate 21 covering the upper part of the device body 20, the screen 23, etc. A dust delivery valve 35 is provided on the inner surface side of the top plate 21. The dust delivery valve 35 guides the processed material along the rotation axis direction of the stripping cylinder 22 to the rear side of the machine body as the stripping cylinder 22 rotates.

[0047] In the threshing section 4A, the entire harvested grain stalk from the root to the ear tip is fed into the stripping chamber 28 from the supply port 30 through the feeder 10. The supply port 30 is located at the front end of the stripping chamber 28. The harvested grain stalks fed as threshing materials are gathered by the gathering section 22A to the inner side of the stripping chamber 28, and threshed by the stripping section 22B and the screen 23. The threshed materials are given rotational force by the rotating stripping section 22B and come into contact with the dust valve 35, and are guided by the dust valve 35 to flow to the rear of the stripping chamber 28. The threshing materials are threshed while being transferred by the stripping section 22B to the rear of the stripping chamber 28. The grains obtained by the threshing process leak out from the screen 23. The threshed straws and broken straws generated by the threshing process are discharged to the outside of the stripping chamber 28 from the straw discharge portion 29 located at the rear end portion of the stripping chamber 28 .

[0048] 〔Sieve〕

[0049] like Figure 3 , 4 As shown, the screen 23 is divided by two division parts Z1 located in the front-to-back direction of the stripping cylinder 22 and one division part Z2 located in the circumferential direction of the stripping cylinder 22. Thus, the screen 23 is divided into six divided screen bodies 23a. The lengths of the six divided screen bodies 23a along the front-to-back direction of the stripping cylinder, the lengths along the circumferential direction of the stripping cylinder, and the shapes are the same.

[0050] like Figure 4As shown, an opening and closing axis core X2 is provided at one of the two lateral ends of the top plate 21. A bolt 19 with an operating tool is provided at the other lateral end of the two lateral ends of the top plate 21. The bolt 19 with the operating tool is connected to the spacing member 20a of the device body 20 to fix the top plate 21 in a closed position. By loosening the bolt 19 with the operating tool to release the closed fixation of the top plate 21, the top plate 21 is lifted and swung with the opening and closing axis core X2 as the swing fulcrum, and the top plate 21 can be changed to an open position. When the top plate 21 is in an open position, the six divided screen bodies 23a in the stripping chamber 28 can be taken out from the upper part of the device body 20 through the upper opening of the device body 20. In addition, when the top plate 21 is in an open position, the six divided screen bodies 23a can be assembled to the stripping chamber 28 from the upper part of the device body 20 through the upper opening of the device body 20. In addition, the assembly positions of the six split screen bodies 23a in the stripping chamber 28 can be replaced (rotated). For example, among the three split screen bodies 23a arranged in the front-to-back direction of the stripping cylinder 22, the split screen body 23a located at the front and easily worn can be moved from the front to the second assembly position for assembly, the split screen body 23a located at the second assembly position from the front can be moved to the third assembly position from the front for assembly, and the split screen body 23a located at the third assembly position from the front can be moved to the front assembly position for assembly.

[0051] 〔Selection Department〕

[0052] like Figure 3 As shown, the screening section 4B has a swing screening device 36, a first recovery section 37, a second recovery section 38, and a sorting fan 39. The swing screening device 36 receives the processed material leaking downward from the screen 23 as the screened processed material, and performs screening while transferring the received screened processed material to the rear of the threshing device. The first recovery section 37 recovers the grains as the first processed material leaking from the swing screening device 36. The second recovery section 38 recovers the second processed material such as grains with branches and stalks leaking from the swing screening device 36. The sorting fan 39 supplies screening air to the swing screening device 36.

[0053] The first recovery section 37 is configured to convey the recovered grains to the lateral outer side of the threshing device 4 by the lateral feed screw 37a. After the grains recovered in the first recovery section 37 are conveyed to the lateral outer side of the threshing device 4, they are conveyed to the lateral outer side of the threshing device 4 by the grain conveying device 40 (see Figure 2 ) is transported upward and stored in the grain tank 5.

[0054] The second recovery unit 38 is configured to transport the recovered second processed material to the lateral outside of the threshing device 4 by means of the lateral feed screw 38a. Then, the second processed material recovered in the second recovery unit 38 is transported to the lateral outside of the threshing device 4 and then is returned to the threshing device 41 (see Figure 2 ) is restored to the stripping chamber 28 for stripping treatment.

[0055] like Figure 3 As shown, the swing screening device 36 has a screen box 42. The screen box 42 is arranged below the screen mesh 23. The screen box 42 is rectangular frame-shaped when viewed from above. Inside the screen box 42, there are a first grain shaking plate 43, a second grain shaking plate 44, a screen wire 45, a chaff screen 46, a grain screen 47, a straw rack 48, etc.

[0056] The screen box 42 has a guide roller 49. The guide roller 49 is located on the left and right outer sides of the front side of the body of the screen box 42. The left and right side walls 24 and 25 of the threshing device 4 have sliding guides (not shown) that freely slideably guide the guide roller 49. A crank-type swing drive unit 52 is provided below the rear side of the threshing device of the screen box 42. The rear side of the threshing device of the screen box 42 performs circular motion by the action of the swing drive unit 52. Therefore, the entire screen box 42 performs a forward and backward swing motion having a component in the up and down directions.

[0057] like Figure 3 As shown, the first grain shaking plate 43 is composed of a plate body formed in a substantially corrugated shape when viewed from the side. The first grain shaking plate 43 is arranged at the upstream end (front end) in the transfer direction of the sifting processed material of the swing sifting device 36. The first grain shaking plate 43 transfers the processed material leaking from the upstream side in the transfer direction of the threshing processed material in the stripping chamber 28 to the rear.

[0058] The screen wire 45 is composed of a piano wire or the like. The screen wire 45 is cantilevered and extended from the end portion of the first grain shaking plate 43 on the downstream side in the transfer direction to the downstream side in the transfer direction. The screen wire 45 transfers the screened processed material sent from the first grain shaking plate 43 to the rear while allowing the grains and the second processed material to leak downward.

[0059] The second grain shaking plate 44 is composed of a plate body formed in a substantially corrugated shape when viewed from the side, similarly to the first grain shaking plate 43. The second grain shaking plate 44 is located downstream and below the transfer direction of the first grain shaking plate 43. The second grain shaking plate 44 transfers the processed material leaking from the downstream side of the transfer direction of the first grain shaking plate 43 and the processed material leaking from the screen line 45 to the rear.

[0060] The chaff screen 46 is located on the downstream side of the screened processed material transfer direction of the second grain shaking plate 44. The chaff screen 46 swings and transfers the screened processed material sent from the second grain shaking plate 44, the screened processed material leaking from the screen wire 45, and the processed material leaking from the screen mesh 23 of the stripping chamber 28 to the rear of the screen box 42, while allowing the grains and the second processed material to leak downward.

[0061] The grain screen 47 is composed of a corrugated steel wire mesh having a plurality of openings for passing grains. The grain screen 47 is located on the lower side of the chaff screen 46. The grain screen 47 is supported by the front side support member 60 and the rear side support member 61. The front side support member 60 and the rear side support member 61 are supported by being erected and straddled across the left and right side portions 42A of the screen box 42. The grain screen 47 swings and transfers the processed material leaking out of the chaff screen 46, while leaking out the grains to the first recovery section 37 below, and transfers the second processed material to the second recovery section 38 on the downstream side of the transfer direction.

[0062] The draft remover 48 is arranged on the downstream side of the conveying direction of the chaff screen 46. The draft remover 48 has a support support body 62 and a plurality of conveying support plates 63. The support support body 62 is connected in a manner spanning the left and right side portions 42A of the screen box 42. The plurality of conveying support plates 63 are spaced apart from each other in the left and right directions, and are fixedly extended backward in a cantilevered manner from the support support body 62. The conveying support plate 63 is composed of a plate body formed in a serrated shape. The conveying support plate 63 can receive the processed object and swing it backward for conveying.

[0063] The straw remover 48 swings and transfers the processed material supplied from the terminal side of the conveying direction of the stripping chamber 28 and the terminal part of the chaff screen 46 to the rear, and causes the second processed material to leak out to the second collecting part 38 below. In addition, the straw remover 48 discharges the processed material such as the straw that has not leaked out to the outside through the dust discharge port 65 at the rear.

[0064] like Figure 3 As shown, the chaff screen 46 and the draft remover 48 are arranged in a state close to each other along the transfer direction. Therefore, the gap between the terminal side of the chaff screen 46 in the transfer direction and the starting side of the draft remover 48 in the transfer direction is small. As a result, broken stalks and the like are not easy to fall from the gap to the second recovery section 38 below. In this structure, for example, in the case of harvesting crops with a large amount of threshing material such as indica rice, it is possible to avoid the second material reduction device 41 being blocked by a large amount of broken stalks falling from the gap between the chaff screen 46 and the draft remover 48, or the broken stalks circulating between the stripping chamber 28 and the second recovery section 38 and becoming unable to be discharged to the outside. The broken stalks are transferred to the rear by the draft remover 48 and discharged from the dust discharge port 65.

[0065] like Figure 3As shown, a flow guide member 66 is provided at the rear side of the second recovery section 38. The flow guide member 66 guides the second processed material leaking from the chaff screen 46 or the draft remover 48 to the second recovery section 38 at the rear side of the second recovery section 38. Although not shown, the flow guide member 66 is a double-layer structure of a thick soft sheet body and a thin hard sheet body. In the flow guide member 66, the soft sheet body is located on the upper side and the hard sheet body is located on the lower side. The soft sheet body is made of a soft resin material that is easily displaced along the inclined guide surface 67 of the second recovery section 38. The hard sheet body is made of a hard material that is difficult to wear. The hard sheet body contacts the inclined guide surface 67 of the second recovery section 38.

[0066] 〔Chaff sieve〕

[0067] like Figure 3 , 6 As shown, the chaff screen 46 has a plurality of band-shaped chaff turning plates 50. The plurality of chaff turning plates 50 are arranged at intervals in the screening process material conveying direction (threshing device front-rear direction).

[0068] Each chaff turning plate 50 is supported on the screen box 42 in a state where the posture can be changed. Figure 6 , 7 As shown in FIGS. 8 and 9, an upper fulcrum shaft 54 ​​is provided on the upper part of the husk turning plate 50 at the left lateral end side of the husk turning plate 50. The upper fulcrum shaft 54 ​​is supported on the left side portion 42A of the screen box 42. The upper fulcrum shaft 54 ​​is supported on the side portion 42A by fitting a long support member 55 extending in the direction of the screened processed material transfer direction of the husk screen 46 (the front-rear direction of the threshing device) to the upper fulcrum shaft 54, and connecting the connecting members 56 installed at a plurality of locations in the front-rear direction of the supporting member 55 to the side portion 42A by connecting bolts 57. The connecting member 56 is attached to the supporting member 55 by welding. In the husk turning plates 50 other than the first husk turning plate 50a and the second husk turning plate 50b among the plurality of husk turning plates 50, an anti-drop plate 58 and an anti-drop pin 59 for preventing the supporting member 55 from falling off are attached to the upper fulcrum shaft 54. The connecting frame 70 is connected to the lower part of the chaff turning plate 50. The connecting frame 70 is long in the direction along the transfer direction of the screened processed material of the chaff screen 46 (the front-rear direction of the threshing device). A plurality of chaff turning plates 50 are interconnected through the connecting frame 70. The connection of the connecting frame 70 to the chaff turning plate 50 is performed by making the connecting frame 70 externally embedded in the lower fulcrum shaft 71. The lower fulcrum shaft 71 is arranged at the lower part of the chaff turning plate 50. The thickness 55W of the support member 55 in the direction of the axis Y of the upper fulcrum shaft 54 ​​is thicker than the thickness 70W of the connecting frame 70 in the direction of the axis Q of the lower fulcrum shaft 71. As Figure 7 , 8As shown, in the first husk turning plate 50a and the second husk turning plate 50b among the plurality of husk turning plates 50, the reinforcement part 72 is installed on the connection frame 70. In a part of the husk turning plates 50 among the plurality of husk turning plates 50, an anti-slip plate 74 and an anti-slip pin 73 for preventing the connection frame 70 from slipping off are installed on the lower fulcrum shaft 71.

[0069] Although not shown in the figure, the support structure and linkage structure of the right lateral end of the husk turning plate 50 are the same as those of the left lateral end. That is, the right lateral end of the husk turning plate 50 is connected to the side portion 42A of the right side of the screen box 42 based on the support structure having the same structure as the support structure of the left lateral end. In addition, the right lateral end of the husk turning plate 50 is linked and connected by the linkage structure having the same structure as the linkage structure of the left lateral end. That is, at the right lateral end of the husk turning plate 50, the husk turning plate 50 also has an upper fulcrum shaft 54 ​​and a lower fulcrum shaft 71, and the upper fulcrum shaft 54 ​​is supported by the side portion 42A of the right side of the screen box 42 via the support member 55 and the connecting member 56. The connecting frame 70 is connected to the lower fulcrum shaft 71.

[0070] Each chaff turning plate 50 is supported by the screen box 42 in a state where the posture relative to the screen box 42 can be changed by swinging with the axis Y of the upper fulcrum shaft 54 ​​as a swing fulcrum. By moving the connection frame 70 in the front-rear direction, the plurality of chaff turning plates 50 change their posture relative to the screen box 42 while being linked by the connection frame 70. By adjusting the posture of the plurality of chaff turning plates 50 relative to the screen box 42, the opening between the chaff turning plates 50, that is, the size of the processed material leakage hole for allowing the screened processed material of the chaff screen 46 to leak out, can be adjusted.

[0071] [First fixing part, second fixing part]

[0072] The chaff screen 46 has a plurality of fixing parts 80, and when the position of the connecting frame 70 is adjusted, the plurality of fixing parts 80 fix the connecting frame 70 to the screen box 42 at the adjusted position (adjusted position or adjustable position). The plurality of fixing parts 80 are dispersedly arranged along the direction of the chaff screen 46 in which the sifted material is transferred. In the present embodiment, the fixing parts 80 are respectively provided in an upstream area of ​​the connecting frame 70 located on the upstream side in the sifted material transfer direction relative to the central part 70C in the sifted material transfer direction of the chaff screen 46, and a downstream area of ​​the connecting frame 70 located on the downstream side in the sifted material transfer direction relative to the central part 70C.

[0073] In this embodiment, if Figure 3 , 5As shown, two fixing parts 80 are provided. The two fixing parts 80 are respectively provided in the upstream area of ​​the connecting frame 70 and the downstream area of ​​the connecting frame 70. In the present embodiment, the first fixing part 80A located in the upstream area of ​​the connecting frame 70 of the two fixing parts 80 is provided at a position above the position between the first recovery part 37 and the second recovery part 38 in the transfer direction of the chaff screen 46. The second fixing part 80B located in the downstream area of ​​the connecting frame 70 of the two fixing parts 80 is provided at a position above the second recovery part 38.

[0074] like Figure 5 , 8 As shown, the first fixing portion 80A includes a first fixing member 81, a lower fulcrum shaft 71 of a first chaff turning plate 50a among the plurality of chaff turning plates 50, and a first positioning bolt 85. The first fixing member 81 is provided outside the left side portion 42A of the screen box 42.

[0075] like Figure 5 , 8 As shown, the first fixing member 81 is supported by the support shaft 82 provided on the side portion 42A on the left side of the screen box 42. Thus, the first fixing member 81 is supported by the side portion 42A in a state where the shaft core Y1 of the support shaft 82 is used as a swing fulcrum. The first fixing portion 80A is supported by the side portion 42A in a state where the shaft core Y1 is used as a swing fulcrum. The shaft core Y1 of the support shaft 82 is located on the same shaft core as the shaft core Y of the upper support shaft 54 ​​of the first chaff turning plate 50a. An anti-slip plate 83 and a threaded hole member 82a for preventing the first fixing member 81 from slipping off are mounted on the support shaft 82. The lower support shaft 71 links the lower portion of the first chaff turning plate 50a and the free end side portion of the first fixing member 81. The lower support shaft 71 is inserted through the long hole 84 provided in the side portion 42A in a state where it can move inside the long hole 84. The long hole 84 is an arc centered on the shaft core Y1.

[0076] like Figure 5As shown, a plurality of through-hole-shaped first positioning holes 86 are provided on the first fixing member 81. The first positioning bolt 85 can be inserted through the first positioning hole 86, but is not engaged. A plurality of threaded hole-shaped first fixing holes 87 are provided on the side portion 42A. The first positioning bolt 85 can be engaged and disengaged in the first fixing hole 87. The first positioning bolt 85 is installed in the first positioning hole 86 in a manner of inserting through a first positioning hole 86 selected from the plurality of first positioning holes 86. Moreover, when the first positioning bolt 85 is engaged with a first fixing hole 87 that matches the first positioning hole 86 among the plurality of first fixing holes 87, the first positioning bolt 85 is locked in a manner of fixing the first fixing portion 80A to the side portion 42A. When the first positioning bolt 85 is removed from the first fixing hole 87 and the first positioning hole 86, it is locked and released in a manner of allowing the first fixing portion 80A to swing.

[0077] Operation opening 88 (see Figure 3 ) is provided on the side wall portion 24 on the left side of the device body 20 so as to be openable and closable. With regard to the first fixing portion 80A, the operator approaches the first positioning bolt 85 through the operation opening 88, makes the first positioning bolt 85 unlocked, and performs a swing operation on the first fixing member 81. Then, the lower fulcrum shaft 71 uses the axis core Y1 as the swing fulcrum, and is swung by the first fixing member 81, and the connection frame 70 is changed in position in the front-rear direction of the threshing device by the lower fulcrum shaft 71. Figure 5 , 8 As shown, a first positioning hole 86 selected from a plurality of first positioning holes 86 is matched with a first fixing hole 87 in a plurality of locations, and in this state, the first positioning bolt 85 is installed in the selected first positioning hole 86 and engaged with the first fixing hole 87 matching the first positioning hole 86. Thus, the first fixing member 81 is fixed to the side portion 42A by the first positioning bolt 85, and the first fixing portion 80A is positioned at a swing position corresponding to the adjustment position of the adjustment target of the connection frame 70. Thus, the connection frame 70 is adjusted to the adjustment position of the adjustment target by the first fixing portion 80A, and the connection frame 70 is fixed to the side portion 42A by the first fixing portion 80A (the lower fulcrum shaft 71, the first fixing member 81 and the first positioning bolt 85) at the adjusted adjustment position.

[0078] like Figure 5 , 9 10, the second fixing portion 80B includes a second fixing member 91, a lower fulcrum shaft 71 of a second chaff turning plate 50b among the plurality of chaff turning plates 50, and a second positioning bolt 97. The second fixing member 91 is provided outside the side portion 42A on the left side of the screen box 42.

[0079] The second fixing member 91 is supported by a support shaft 92 provided on the side portion 42A on the left side of the screen box 42. Thus, the second fixing member 91 is supported by the side portion 42A in a state where the shaft core Y2 of the support shaft 92 is used as a swing fulcrum and can be swung. The second fixing portion 80B is supported by the side portion 42A in a state where the shaft core Y2 is used as a swing fulcrum and can be swung. The shaft core Y2 of the support shaft 92 is located on the same shaft core as the shaft core Y of the upper support shaft 54 ​​of the second chaff turning plate 50b. An anti-slip plate 93 and a threaded hole member 92a for preventing the second fixing member 91 from slipping off are mounted on the support shaft 92. The lower support shaft 71 links the lower portion of the second chaff turning plate 50b and the free end side portion of the second fixing member 91. The lower support shaft 71 is inserted through the long hole 94 provided in the side portion 42A in a state where it can move inside the long hole 94. The long hole 94 is arc-shaped with the shaft core Y2 as the center.

[0080] like Figure 5 , 10 As shown, a second positioning hole 95 in the shape of an arc-shaped long hole centered on the axis Y2 is provided on the second fixing member 91. A second fixing hole 96 in the shape of a threaded hole is provided on the side portion 42A on the left side of the screen box 42. The second positioning bolt 97 is installed in the second positioning hole 95 in a manner of being inserted through the second positioning hole 95 and fastened to the second fixing hole 96, thereby fastening the second fixing portion 80B to the side portion 42A, thereby becoming a locked state. The second positioning bolt 97 is loosened by loosening the fastening to the second fixing hole 96, thereby releasing the fixation of the second fixing portion 80B relative to the side portion 42A, allowing the second fixing portion 80B to swing, thereby becoming a locked release state.

[0081] When the position of the connection frame 70 is adjusted by the first fixing part 80A, the operator approaches the second positioning bolt 97 through the operation opening 88 with respect to the second fixing part 80B, and the second positioning bolt 97 is changed to the unlocked state. Then, as the connection frame 70 changes position by the first fixing part 80A, the swing of the first fixing part 80A is transmitted to the lower fulcrum shaft 71 via the connection frame 70. Thus, the second fixing part 80B performs a swing operation with the axis core Y2 as the swing fulcrum. After the first fixing part 80A is fixed to the side part 42A, the operator changes the second positioning bolt 97 to the locked state. Then, the second fixing part 80B is positioned at a swing position corresponding to the adjustment position of the connection frame 70 adjusted by the first fixing part 80A. Thus, the connection frame 70 is adjusted to the adjustment position of the adjustment target by the second fixing part 80B, and the connection frame 70 is fixed to the side part 42A by the second fixing part 80B (lower fulcrum shaft 71, second fixing member 91 and second positioning bolt 97) at the adjustment position of the adjustment target.

[0082] The size of the processed material leakage hole of the chaff screen 46 is adjusted based on the following principles.

[0083] The fourth segmented cover 76d in the threshing device cover 76 is removed, and the operation opening 88 of the side wall portion 24 on the left side of the device body 20 is opened. The second positioning bolt 97 is approached through the opened operation opening 88, and the second positioning bolt 97 of the second fixing portion 80B is loosened to release the fixing of the second fixing portion 80B to the side portion 42A, thereby releasing the fixing of the connecting frame 70 to the side portion 42A by the second fixing portion 80B. Next, the first positioning bolt 85 is approached through the operation opening 88, and the first positioning bolt 85 of the first fixing portion 80A is removed to release the fixing of the first fixing portion 80A to the side portion 42A, thereby releasing the fixing of the connecting frame 70 to the side portion 42A by the first fixing portion 80A, and the first fixing portion 80A is swung to change the position of the connecting frame 70. When the connecting frame 70 reaches the adjustment position of the adjustment target, the first positioning bolt 85 is installed in the first positioning hole 86 of the matched first fixing portion 80A and the first fixing hole 87 of the side portion 42A, the first fixing portion 80A is fixed to the side portion 42A, and the upstream area of ​​the connecting frame 70 is fixed to the side portion 42A through the first fixing portion 80A. Then, the second positioning bolt 97 of the second fixing portion 80B is tightened to fix the second fixing portion 80B to the side portion 42A, so that the downstream area of ​​the connecting frame 70 is fixed to the side portion 42A through the second fixing portion 80B.

[0084] [Other implementation methods]

[0085] (1) In the above embodiment, the fixing portion 80 is provided on the left lateral side of the screen box 42, but the present invention is not limited thereto. For example, the fixing portion 80 may be provided on the right lateral side of the screen box 42.

[0086] (2) In the above embodiment, an example is shown in which two fixing portions 80 are provided, but the present invention is not limited thereto. For example, a configuration in which three or more fixing portions 80 are provided may be adopted.

[0087] (3) In the above embodiment, an example is shown in which one fixing portion 80 is provided in each of the upstream and downstream regions of the connecting frame 70, but the present invention is not limited thereto. For example, two or more fixing portions 80 may be provided in each of the upstream and downstream regions of the connecting frame 70.

[0088] (4) In the above embodiment, an example is shown in which the first fixing portion 80A is provided in the upstream region of the connecting frame 70, and the second fixing portion 80B is provided in the downstream region of the connecting frame 70, but the present invention is not limited thereto. For example, the second fixing portion 80B may be provided in the upstream region of the connecting frame 70, and the first fixing portion 80A may be provided in the downstream region of the connecting frame 70.

[0089] (5) In the above embodiment, an example is shown in which a plurality of first fixing holes 87 are provided in the side portion 42A, but the present invention is not limited thereto. For example, a structure may be adopted in which only one first fixing hole 87 is provided in the side portion 42A, and each of the plurality of first positioning holes 86 of the first fixing member 81 (first fixing portion 80A) matches one first fixing hole 87.

[0090] (6) In the above embodiment, an example is shown in which a plurality of first positioning holes 86 are provided in the first fixing member 81 (first fixing portion 80A), and a first fixing hole 87 is provided in the side portion 42A, but the present invention is not limited thereto. For example, a plurality of positioning holes (or first fixing holes 87) in which the first positioning bolt 85 can be engaged may be provided in the side portion 42A, and only one first positioning hole 86 may be provided in the first fixing member 81 (first fixing portion 80A), so that the first positioning hole 86 of the first fixing member 81 (first fixing portion 80A) matches one positioning hole (or first fixing hole 87) selected from the plurality of positioning holes (or first fixing holes 87) of the side portion 42A.

[0091] (7) In the above embodiment, an example is shown in which the second fixing member 91 (second fixing portion 80B) is provided with the second positioning hole 95 in the shape of an elongated hole, and the second fixing hole 96 is provided in the side portion 42A, but the present invention is not limited thereto. For example, a structure in which the second positioning hole 95 in the shape of an elongated hole is provided in the side portion 42A, a positioning hole through which the second positioning bolt 97 is inserted is provided in the second fixing member 91 (second fixing portion 80B), and the second fixing member 91 (second fixing portion 80B) is fastened and fixed to the side portion 42A by the second positioning bolt 97 installed in the positioning hole of the second fixing member 91 (second fixing portion 80B) and a threaded hole member engaged with the second positioning bolt 97.

[0092] (8) In the above embodiment, an example is shown in which the thickness 55W of the support member 55 is thicker than the thickness 70W of the connection frame 70, but the present invention is not limited to this. The thickness of the support member 55 may be thinner than the thickness of the connection frame 70, or the thickness of the support member 55 and the thickness of the connection frame 70 may be the same.

[0093] Industrial Applicability

[0094] The present invention can be applied to a threshing device mounted on a general combine harvester or a self-threshing combine harvester.

[0095] Description of reference numerals:

[0096] 4A Threshing Department

[0097] 4B Screening Department

[0098] 22 Stripping cylinder

[0099] 23 Screen

[0100] 28 Stripping Room

[0101] 37 First Recovery Department

[0102] 38 Second Recovery Department

[0103] 42 Screen Box

[0104] 42A side

[0105] 46 chaff sieve

[0106] 50 Husk Flip Plate

[0107] 54 upper fulcrum shaft

[0108] 55 Supporting member

[0109] 70 connection frame

[0110] 71 lower fulcrum shaft

[0111] 70C center

[0112] 80 fixed part

[0113] 80A first fixing part

[0114] 80B Second fixing part

[0115] 85 first positioning bolt

[0116] 86 first positioning hole

[0117] 95 second positioning hole

[0118] 97 Second positioning bolt

[0119] Y axis core (upper fulcrum axis) Q axis core (lower fulcrum axis)

Claims

1. A threshing device, wherein: It has a threshing part and a screening part. The threshing section comprises: a threshing chamber, to which the harvested crops are supplied; A stripping cylinder is rotatably disposed in the stripping chamber to strip the supplied crops; and a screen, which is arranged below the stripping cylinder; The screening part comprises: a screen box, which is swingably arranged below the screen; and a chaff screen supported by the screen box, receiving the threshed processed material leaking from the screen as a screen processed material, and performing a screen process on the received screen processed material; The chaff screen comprises a plurality of chaff turning plates supported by the screen box and a connecting frame connecting the plurality of chaff turning plates; The plurality of chaff turning plates are arranged at intervals along the transfer direction of the chaff screen for the screened processed material, and can change their postures. The plurality of chaff turning plates are configured to change their postures by adjusting the position of the connecting frame. The threshing device has a plurality of fixing parts for fixing the connection frame to the side of the screen box at the adjusted position after the position adjustment. The plurality of fixing portions are dispersed in a direction along a transfer direction of the screening processed object.

2. The threshing device according to claim 1, wherein: The fixing parts are respectively arranged in an upstream area of ​​the connecting frame located upstream in the direction of transfer of the screened objects relative to a central area of ​​the connecting frame and a downstream area of ​​the connecting frame located downstream in the direction of transfer of the screened objects relative to the central area.

3. The threshing device according to claim 2, wherein: The fixing portion located in the upstream region and the fixing portion located in the downstream region are each supported by the side portion so as to be swingable. The first fixing portion, which is one of the fixing portion located in the upstream area and the fixing portion located in the downstream area, is configured to be positioned at a swing position corresponding to the adjustment position of the connection frame by a plurality of first positioning holes provided in one of the first fixing portion and the side portion and a first positioning bolt installed in any one of the plurality of first positioning holes selected from the plurality of first positioning holes and connecting the first fixing portion to the side portion, The plurality of first positioning holes are respectively arranged corresponding to the plurality of adjustment positions of the connection frame. The second fixing part, which is the fixing part located in the upstream side area and the other of the fixing parts located in the downstream side area, is constructed by a second positioning hole in the shape of a long hole provided in the second fixing part and one of the side parts and a second positioning bolt installed in the second positioning hole and connecting the second fixing part to the side part, and is positioned at a swinging position corresponding to the adjustment position of the connecting frame.

4. The threshing device according to claim 3, wherein: The first fixing portion is disposed in the upstream region, The second fixing portion is provided in the downstream area.

5. The threshing device according to claim 4, wherein: have: a first recovery unit for recovering the first processed material screened by the chaff screen; and A second recovery section is disposed on the downstream side of the screened processed material transfer direction compared to the first recovery section, and recovers the second processed material screened by the chaff screen; The first fixing portion is provided above a portion between the first collecting portion and the second collecting portion in the transfer direction of the screening processed object. The second fixing portion is provided above the second collecting portion.

6. The threshing device according to any one of claims 1 to 5, wherein: The chaff turning plate is provided with an upper fulcrum shaft and a lower fulcrum shaft. The threshing device includes a supporting member connected to the side portion in a state of being externally fitted to the upper fulcrum shaft and supported by the side portion so that the chaff turning plate can change its posture. The connecting frame is embedded in the lower support shaft and connected to the husk turning plate. The thickness of the support member in the direction along the axial center of the upper fulcrum shaft is thicker than the thickness of the connection frame in the direction along the axial center of the lower fulcrum shaft.

Images