A combine harvester

Abstract

The present invention provides a combine harvester, wherein a feeding port is arranged in the middle of a frame, so that a connection port between a crop conveying structure connected thereto and a harvesting platform is located near the middle of the harvesting platform, and crops can be fed more evenly to the connection port from both sides of the harvesting platform; at the same time, a spreading structure is arranged near a grain storage component, and a "J"-shaped threshing direction of a double-helix threshing conveying system is utilized, so that crops enter from the middle of the front end of the harvester and are spread out from the middle of the tail end, thereby ensuring the stability of the center of gravity of the combine harvester. A cleaning transmission system is arranged outside the threshing system, and the transmission is centralized, which is convenient for installation and debugging. The whole machine has a compact structure and occupies a small space. The center of gravity is always kept stable during idling and harvesting operations, and the maneuverability is high and the operation efficiency is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to a combine harvester. Background Art

[0002] The threshing system of crawler combine harvesters can be divided into longitudinal axial flow threshing and cleaning system and transverse axial flow threshing and cleaning system. These two types of threshing and cleaning systems are the main structural forms currently used in the market.

[0003] The longitudinal axial flow drum is longer, which allows the crops time to be fully threshed and separated in the drum. However, if the length is too long, the length of the entire machine will inevitably be lengthened, the structure will not be compact enough, the machine will not be flexible enough when operating or turning, the maneuverability will be poor, and the operating efficiency will be low.

[0004] The transverse flow drum mainly includes a single-drum transverse flow threshing system and a 1.5-drum transverse flow threshing system. Although its layout on the harvester is shorter than the overall length of the longitudinal flow, its drum stroke is shorter, and the threshing stroke is less than half of the longitudinal flow. When encountering difficult-to-thresh varieties, such a short drum cannot allow the crops to have sufficient time to be threshed in the drum, and finally some of the fed crops are discharged from the body before they can be threshed, resulting in greater crop losses. Therefore, the existing mainstream combine harvesters cannot achieve high mobility while ensuring high harvesting efficiency. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the combine harvester in the prior art cannot achieve high mobility and high operating efficiency at the same time.

[0006] To this end, the present invention proposes a combine harvester, comprising: a frame, a walking mechanism is arranged below the chassis of the frame; a power assembly, a harvesting assembly, a cab, a threshing and cleaning system, a cleaning transmission system and a grain storage assembly are arranged above the chassis of the frame;

[0007] The harvesting assembly includes a header and a crop conveying structure; the cab and the crop conveying structure are arranged in parallel at the front of the frame;

[0008] The threshing and cleaning system comprises a double-helix threshing and conveying system, which has a "J"-shaped threshing direction; the threshing and cleaning system and the grain storage component are arranged in parallel at the rear of the frame; the crop conveying structure is connected to the feeding port of the threshing and cleaning system; the feeding port is arranged at the front end of the threshing and cleaning system and close to the grain storage component; the spreading structure in the threshing and cleaning system is arranged at the rear end of the threshing and cleaning system and close to the grain storage component;

[0009] The power assembly includes an engine and a gearbox; the engine is fixed on the chassis of the frame between the cab and the grain storage assembly; the engine is suitable for driving the cleaning transmission system; the cleaning transmission system is arranged on the threshing and cleaning system and is located on the side facing away from the grain storage assembly.

[0010] The double-helix threshing and conveying system comprises:

[0011] Two concave plate screens are arranged on the frame in parallel and at intervals in the horizontal direction; the inner screen surface of any of the concave plate screens is in an arc shape; transition ports are radially provided at one end of the two concave plate screens located on the same side of the frame; the two transition ports are opposite to each other and are connected to each other;

[0012] A transition plate screen, laid between the two concave plate screens and connecting the two transition ports;

[0013] A crop feeding port is provided on the concave plate screen at the other end opposite to the transition port and away from the transition port;

[0014] Two barrel covers are corresponding to each other and buckled on the concave plate screen, and a hollow cylindrical installation cavity is formed between the barrel covers and the concave plate screen; a plurality of guide members are arranged at intervals on the wall surface of any barrel cover facing the installation cavity, and are suitable for guiding the crops entering the installation cavity to move in a directional manner around the axis; the guiding directions of the guide members in the two barrel covers are opposite;

[0015] Two rollers are coaxially and rotatably arranged in the installation cavity; gaps are arranged between the rollers and the corresponding inner screen surface and the end surface of the guide member; the working area of ​​the roller is the same as the length of the corresponding concave screen; the two concave screens are the same in length.

[0016] It also includes a limit adjustment structure, which is detachably arranged at the gap formed between the outer screen surfaces of the two concave plate screens and the transition plate screen.

[0017] The limit adjustment structure also includes:

[0018] The two adjusting members are in an arc shape as a whole and are respectively fixed on the two concave plate screens on both sides of the notch; and the two sides of the sealing plate are respectively fixed on the two adjusting members.

[0019] Any of the adjusting members comprises:

[0020] An adjusting plate, the plate surface of which is in an arc shape matching the concave plate screen fixed thereto; the plate surface of the adjusting plate is suitable for partially blocking the transition port;

[0021] Two mounting plates are bent along the adjusting plate and are respectively fixed on opposite sides of the adjusting plate; one of the mounting plates is adapted to be fixed on the concave screen, and the other mounting plate is adapted to be fixedly connected to the sealing plate.

[0022] The cross-section of the adjusting member is in a U shape.

[0023] The screen surface of the transition plate screen is tangent to the inner screen surface of the concave screen that first contacts the crop.

[0024] The cylinder cover includes a square mounting frame and an arc-shaped cover body hinged to one side frame edge of the mounting frame; the mounting frame is adapted to be lapped and fixed on the edge of the concave screen;

[0025] The cover body includes an arc-shaped top cover and side top plates sealed on both sides of the top cover; the guiding members are arranged at intervals along the inner wall surface of the top cover, and a guiding channel is formed between adjacent guiding members.

[0026] A plurality of拨动 members are arranged at intervals along the axial direction of any one of the drums; all the拨动 members have the same size; the distance from the end face of any one of the拨动 members to the axis of the drum forms the rotation radius of the drum;

[0027] The height of the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop later from the horizontal plane is greater than the height of the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop first from the horizontal plane.

[0028] The threshing and cleaning system further includes a screening system; the screening system includes:

[0029] A vibrating screen, which has an upper screening area and a lower screening area; the screen frame of the vibrating screen is in an overall funnel-shaped structure;

[0030] A corrugated plate, a lifting structure, at least one section of scale screen and a tail screen are arranged in sequence along the crop moving direction in the upper screening area;

[0031] A lower screen is arranged in the lower screening area corresponding to the scale screen;

[0032] A front sealing structure is hermetically fixed at the front end of the corrugated plate;

[0033] A grain separation structure is arranged at the end of the lower screen and straddles between the grain collection area and the residue collection area;

[0034] A driving structure is fixed on the frame and is adapted to drive the vibrating screen to vibrate reciprocally.

[0035] The lifting structure is a jitter screen; the jitter screen includes:

[0036] It should be noted that the "拨动件" in the text is a term that may need to be further defined according to the specific context. Here, it is directly translated as "拨动 member" for the time being.The mounting member comprises a mounting surface and a mounting surface which is opposite to the mounting surface and is arranged at an acute angle to the mounting surface; the mounting surface is fixed to the rear end of the corrugated plate;

[0037] A plurality of screen teeth extend along the opening direction of the angle formed by the assembly surface and the mounting surface, and one end is a fixed end fixed on the mounting surface at intervals, and the other end is a free end and is suspended.

[0038] Any of the screen teeth is bent in a step-like manner, and is suitable for guiding the crops to move along the screen teeth from the fixed end located on the mounting surface to the free end.

[0039] The front sealing structure comprises:

[0040] A sealing member is fixed between a front material plate at the front end of the corrugated plate and a fan housing located below the front material plate; the width of the sealing member is not less than the screen width of the vibrating screen between the front material plate and the fan housing;

[0041] Two opposite sides of the sealing member in the width direction correspond to the left and right side walls of the frame and are arranged with a gap therebetween.

[0042] The front sealing structure also includes:

[0043] The first shielding member is arranged between the front material plate and the screen front plate of the vibrating screen; the first shielding member is a flexible member having an extension margin for the reciprocating vibration of the vibrating screen.

[0044] The front sealing structure also includes:

[0045] A second shielding member has one end fixed to one end of the front material plate facing the vibrating screen, and the other end is a free end and naturally hangs down to the screen surface of the vibrating screen.

[0046] The seed separation structure comprises:

[0047] An isolating member is disposed between the seed collection area and the debris collection area and fixed on the screen frame; an isolating surface of the isolating member extends from one side of the seed collection area to above the debris collection area;

[0048] A front curtain extends in the same direction as the isolation surface, with one end fixed on the isolation member and the other end mounted on the seed bottom shell in the seed collection area; it is suitable for covering the opening formed between the isolation member and the seed bottom shell connecting the seed collection area and the debris collection area.

[0049] The seed separation structure further comprises:

[0050] The rear curtain is set at an angle to the isolation surface, and one end is fixed on the isolation member, and the other end is placed on the debris bottom shell in the debris collection area; it is suitable for covering the opening formed between the isolation member and the debris bottom shell that connects the debris collection area and the grain collection area.

[0051] The driving structure comprises:

[0052] Two bearing seats are respectively fixed on the side walls of two symmetrical and vertically arranged support beams at the rear end of the frame; an outer spherical bearing is installed in any of the bearing seats;

[0053] A transmission shaft, both ends of which are respectively fixed in the outer spherical bearings;

[0054] Two eccentric bearings are fixed at both ends of the transmission shaft in a mirror image;

[0055] One end of the screen frame is fixed on the two eccentric bearings, and the other end is arranged on the frame through a reciprocating guide structure;

[0056] The driving wheel is fixed on one end of the transmission shaft and is suitable for being driven by a driver of the harvester and driving the transmission shaft to rotate.

[0057] The reciprocating guide structure comprises:

[0058] Two track bearings are symmetrically arranged on both sides of the screen frame and away from one end of the transmission shaft;

[0059] Two vibration tracks are symmetrically arranged on the frames on both sides of the screen frame; the guiding direction of the vibration track is arranged at an angle with the horizontal plane; the track bearings are slidably arranged in the vibration track in one-to-one correspondence.

[0060] The threshing and cleaning system also includes an air supply system; the air supply system includes:

[0061] A fan having an air outlet;

[0062] An air supply channel is formed between the bottom shell at the lower part of the harvester and the threshing system at the upper part;

[0063] The bottom shell comprises a fan housing, a grain bottom shell, a waste bottom shell and a screen frame of a vibrating screen which are arranged in sequence;

[0064] A tail cover is installed at the tail end of the threshing system away from the fan; a discharge port is formed between the tail cover and the screen frame; a baffle is arranged between the tail cover and the vibrating screen to guide the air supply toward the discharge port;

[0065] In the vertical direction, the height of the discharge port is higher than the height of the air outlet; the air outlet is inclined toward the discharge port; the fan housing, the seed bottom shell, the residual bottom shell and the screen frame are inclined from one side of the air outlet toward the discharge port and are gradually increased in height;

[0066] The fan housing has a cylindrical mounting cavity;

[0067] The two ends of the fan housing in the axial direction are respectively provided with first air inlets connected to the outside;

[0068] A second air inlet is provided on a side wall of the fan housing opposite to the air outlet along its circumference; in the axial direction of the fan housing, the second air inlet is located in the middle of the fan housing.

[0069] The cleaning transmission system comprises:

[0070] An output pulley connected to the engine transmission; the output pulley is divided into three transmission outputs; the three transmissions are distributed on the same side wall of the frame;

[0071] The first transmission path includes an output pulley, a first threshing pulley and a second threshing pulley;

[0072] The second transmission includes an output pulley and a chopper pulley;

[0073] The third transmission includes an output pulley, a fan pulley, a grain pulley, a miscellaneous pulley and a screening pulley; all the pulleys are connected in transmission.

[0074] Also includes:

[0075] The first transition wheel is fixed on the frame and arranged between the output pulley and the chopper pulley; the output pulley is in driving connection with the first transition wheel; the first transition wheel is in driving connection with the chopper pulley.

[0076] Also includes:

[0077] The second transition wheel is fixed on the frame and arranged in the third transmission; the output pulley, the fan pulley, the grain pulley, the second transition wheel and the miscellaneous pulley are transmission-connected; the second transition wheel is transmission-connected with the screening pulley.

[0078] The three-way transmission all adopts V-belt transmission connection.

[0079] The first threshing belt wheel and the second threshing belt wheel are connected through a combined belt transmission.

[0080] It also includes a plurality of tensioning assemblies distributed between adjacent pulleys and suitable for tensioning the V-belts between adjacent pulleys.

[0081] Any of the tensioning assemblies comprises:

[0082] A tensioning arm, one end of which is hingedly arranged on the frame and the other end is a free end;

[0083] A tensioning wheel, fixed to the free end of the tensioning arm;

[0084] A pull rod, fixed on the frame;

[0085] A tension spring is arranged between the pull rod and the tensioning arm;

[0086] The tension wheel is tensioned and abutted against the V-belt by the biasing force of the tension spring.

[0087] The grain auger is passed through the frame, with one end fixing the grain pulley and the other end connected to the granary auger; a direction-changing gear box is arranged between the grain auger and the granary auger.

[0088] The miscellaneous auger is passed through the frame, and a miscellaneous pulley is fixed at one end, and the other end is connected to the re-take-off auger; a direction-changing gear box is arranged between the miscellaneous auger and the re-take-off auger.

[0089] The distribution structure includes:

[0090] A grass dividing plate, fixed on the upper edge of the grass discharge port;

[0091] The board surface of the grass separating board is gradually expanded from the grass discharge port toward an end away from the grass discharge port;

[0092] A plurality of first grass guide plates are arranged at intervals on the lower surface of the grass separating plate in a direction parallel to the edge of the grass discharge port; the first grass guide plates are perpendicular to the grass separating plate and are arranged at an angle to the center line of the grass separating plate.

[0093] The first grass guide plate is arranged at one end close to the grass discharge port; and further comprises:

[0094] A plurality of second grass guide plates are arranged at intervals on the lower surface of the grass separation plate in a direction parallel to the edge of the grass discharge port and located at an end away from the grass discharge port; the second grass guide plates are perpendicular to the grass separation plate and are arranged at an angle to the center line of the grass separation plate;

[0095] The number of the second grass guide plates is greater than the number of the first grass guide plates.

[0096] The technical solution of the present invention has the following advantages:

[0097] 1. The combine harvester provided by the present invention has a cab and a crop conveying structure arranged in parallel at the front of the frame, a threshing and cleaning system and a grain storage component arranged in parallel at the rear of the frame, the crop conveying structure is connected to the feeding port of the threshing and cleaning system, the feeding port is arranged at the front end of the threshing and cleaning system and close to the grain storage component, and the spreading structure in the threshing and cleaning system is arranged at the rear end of the threshing and cleaning system and close to the grain storage component. The engine is fixed on the chassis of the frame between the cab and the grain storage component, and the engine is suitable for driving the cleaning transmission system, which is arranged on the threshing and cleaning system and located on the side facing away from the grain storage component. The feeding port is arranged in the middle of the frame, so that the connection port between the crop conveying structure connected thereto and the header is located near the middle of the header, and the crops are fed to the connection port from both sides of the header more evenly; at the same time, the spreading structure is arranged near the grain storage component, and the "J" threshing direction of the double-helix threshing conveying system is utilized, so that the crops enter from the middle of the front end of the harvester and are spread out from the middle of the tail end, thereby ensuring the stability of the center of gravity of the combine harvester. The cleaning transmission system is set outside the threshing system, with centralized transmission, which is easy to install and debug. The whole machine has a compact structure and occupies a small space. It always keeps the center of gravity stable during the empty machine operation and harvesting operation, with high maneuverability and remarkable operating efficiency.

[0098] 2. The combine harvester provided by the present invention has two threshing spaces arranged horizontally and spaced apart from each other in the direction of travel of the harvester. The threshing space is a hollow cylindrical installation cavity surrounded by a concave plate screen and a cylinder cover, and a roller is installed in each installation cavity. Guide members are arranged at intervals on the inner wall surface of the cylinder cover to guide the crops entering the threshing space to move in a directional manner around the axis. When the cylinder rotates, the crops are driven to move and enter the second threshing space from the first threshing space under the guidance of the guide member. The working areas of the two threshing spaces are the same length. Therefore, the crop threshing path passes through the length of the two rollers and can be fully threshed. The two threshing spaces are arranged horizontally at intervals, which makes the structure on the frame more compact. The two threshing working areas are the same length and can ensure a sufficiently long threshing path, which fully ensures the threshing effect while ensuring the overall maneuverability of the harvester.

[0099] 3. The combine harvester provided by the present invention is provided with a limit adjustment structure at the gap formed between the outer screen surface of the two concave screens and the transition screen plate, and the limit adjustment structure is detachably fixed to the concave screens on both sides. When the limit adjustment structure is not provided, part of the crops will fall from the gap into the lower vibrating screen after passing through the first concave screen only, and directly enter the subsequent process. When the limit adjustment structure is provided, the crops will pass through the complete "J" shape from the first concave screen via the transition screen into the second concave screen, with a longer transmission path and better threshing and screening effect.

[0100] 4. The combine harvester provided by the present invention has a vibrating screen with an upper screen area and a lower screen area. A lifting structure is arranged at the tail end of the corrugated plate in the upper screen area to increase the height difference between the corrugated plate and the fish scale screen, and cooperates with the tail screen at the tail end to form a two-stage lift, which can fully shake out and loosen the agglomerated crops, and avoid the crop straw from entraining and entraining the grains when discharged, causing waste. At the same time, a front sealing structure is arranged at the front end of the corrugated plate to prevent the grains from being thrown out by the vibrating screen. A grain separation structure is arranged between the grain collection area and the debris collection area below the vibrating screen to effectively separate the clean grains from the debris such as straw, so that the grains can be collected more completely and cleanly, waste can be avoided, and screening efficiency can be improved.

[0101] 5. The combined harvester provided by the present invention has a lifting structure of a shaking screen, including a mounting member and a plurality of screen teeth, wherein the mounting member has an assembly surface and an assembly surface that is opposite to the assembly surface and is arranged at an acute angle to the assembly surface, and the screen teeth extend along the opening direction of the angle formed between the assembly surface and the mounting surface, and one end is a fixed end that is fixed on the mounting surface at intervals, and the other end is a free end that is suspended. When the vibrating screen vibrates back and forth as a whole, the crops slide from the corrugated plate to the shaking screen, and are lifted up by the shaking of the suspended screen teeth, and then fall onto the fish scale screen, so as to shake and loosen the crops. In addition, the shaking screen can be arranged on the corrugated plate at different inclination angles according to different needs, so as to make full use of the space and make the screening system more compact while ensuring the screening effect.

[0102] 6. The combine harvester provided by the present invention has a seal fixedly arranged between the front material plate for guiding the grains to slide down below the harvester threshing drum and the fan housing below the front material plate. The width of the seal is not less than the screen width of the vibrating screen between the front material plate and the fan housing, and the two opposite sides of the seal in the width direction correspond to the left and right side walls of the frame and are provided with a gap. The seal is used to block the opening connected to the vibrating screen surrounded by the front material plate located above, the fan housing located below, and the left and right side walls of the frame. The crop grains are blocked by the seal and fall back to the grain collection area below the vibrating screen along the fan housing, so as to prevent the crop grains from flying out of the opening and falling to the ground, causing waste.

[0103] 7. The combine harvester provided by the present invention has a grain separation structure including an isolating member and a front curtain, which are arranged between the grain collecting area and the debris collecting area and fixed on the shell of the vibrating screen, the isolating surface of the isolating member extends from one side of the grain collecting area to above the debris collecting area, the front curtain extends in the same direction as the isolating surface, one end of which is fixed on the isolating member, and the other end is mounted on the grain bottom shell in the grain collecting area, so as to shield the opening formed between the isolating member and the grain bottom shell connecting the grain collecting area and the debris collecting area, so that the wind blown by the fan travels along the front curtain and the isolating member and blows out from the opening formed between the isolating member and the lower screen, so as to prevent the return air from carrying debris into the grain collecting area and contaminating the grains in the granary, and at the same time increase the air volume blown to the end of the lower screen, thereby improving the air selection effect.

[0104] 8. The combine harvester provided by the present invention forms an air supply channel between the bottom shell at the lower part of the harvester and the threshing system at the upper part, and the bottom shell includes a fan housing, a grain bottom shell, a waste bottom shell and a screen frame of a vibrating screen which are arranged in sequence. A tail cover is installed at the tail end of the threshing system away from the fan, a discharge port is formed between the tail cover and the screen frame, and a flow blocker is arranged between the tail cover and the vibrating screen to guide the air supply toward the discharge port.

[0105] In the vertical direction, the height of the discharge port is higher than the height of the air outlet, and the air outlet is inclined toward the discharge port. The fan housing, the grain bottom shell, the residual bottom shell and the screen frame are inclined from one side of the air outlet toward the discharge port and gradually increased in height. The first air inlet connected to the outside world is respectively opened at both ends of the fan housing, and the second air inlet is opened along its circumference on the side wall in the middle of the fan housing opposite to the air outlet. The air is supplied through three air inlets evenly distributed on the fan housing, so that the air volume in the fan is uniform and stable. The air outlet is gradually increased in height toward the discharge port to improve the fluidity, and a baffle is installed on the tail cover to guide the supply air toward the discharge port to prevent the return air from entering the threshing system and the screening system and affecting the cleanliness of the crop. The air supply system has a compact and stable structure, sufficient air volume, and no return air influence, which greatly improves the air selection efficiency.

[0106] 9. The combine harvester provided by the present invention has an output pulley with three transmission outputs, and the three transmissions are distributed on the same side wall of the frame. The first transmission includes an output pulley, a first threshing pulley and a second threshing pulley, the second transmission includes an output pulley and a chopper pulley, and the third transmission includes an output pulley, a fan pulley, a grain pulley, a miscellaneous pulley and a screening pulley, and all the pulleys are connected by transmission. The power inputs of the threshing mechanism, the chopping mechanism, the air selection mechanism, the grain storage mechanism, the miscellaneous re-threshing mechanism and the screening mechanism of the harvester are all arranged on the same side of the frame, so that the transmission system structure of the whole machine is compact. All the transmission pulleys are arranged on the same side, which is convenient for installation, control and debugging. And the power input of each mechanism is directly provided by the output pulley, avoiding the transmission loss caused by the intermediate transmission, reducing the workload of the mechanism providing the intermediate transmission, and improving the transmission efficiency and service life of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0107] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0108] Figure 1 The structure of the combine harvester in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0109] Figure 2 The structure of the combine harvester in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0110] Figure 3 The structure of the concave plate screen in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0111] Figure 4 It is a schematic diagram of the assembly structure of the concave plate screen in an embodiment of the present invention;

[0112] Figure 5 It is a schematic diagram of the assembly structure of the concave plate screen, the drum cover and the drum in the embodiment of the present invention;

[0113] Figure 6 The structure of the concave plate screen in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0114] Figure 7 The structure of the concave plate screen in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0115] Figure 8 It is a schematic diagram of the exploded structure of the concave plate screen and the cylinder cover assembly in an embodiment of the present invention;

[0116] Fig. 9 It is a schematic diagram of the structure of the double rollers in an embodiment of the present invention;

[0117] Fig.10 This is a schematic diagram of the movement of crops in a double-drum structure in an embodiment of the present invention;

[0118] Fig.11 Schematic diagram of the structure of the first roller in an embodiment of the present invention;

[0119] Fig.12 Schematic diagram of the structure of the second roller in an embodiment of the present invention;

[0120] Fig.13 It is a schematic diagram of the structure of the cylinder cover in an embodiment of the present invention;

[0121] Fig.14 Schematic diagram of the distribution structure of the grass guide plate in an embodiment of the present invention;

[0122] Fig.15 It is a structural schematic diagram of a screening system in an embodiment of the present invention;

[0123] Fig.16 It is a structural schematic diagram of a shaking screen in an embodiment of the present invention;

[0124] Fig.17 It is a structural schematic diagram of a mounting plate in an embodiment of the present invention;

[0125] Fig.18 This is a schematic diagram of the structure of the screen fork group in an embodiment of the present invention;

[0126] Fig.19 This is a schematic diagram of the assembly structure of the shaking screen in an embodiment of the present invention;

[0127] Fig. 20 This is a schematic diagram of the sealing plate installation structure in an embodiment of the present invention;

[0128] Fig.21 This is a schematic structural diagram of a front sealing structure in an embodiment of the present invention;

[0129] Fig. 22 This is a schematic structural diagram of a grain separation structure in an embodiment of the present invention;

[0130] Fig.23 A schematic diagram of the structure of an isolating element in an embodiment of the present invention;

[0131] Fig.24 The structure diagram of the vibrating screen drive in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0132] Fig.25 The structure diagram of the vibrating screen drive in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0133] Fig.26 Schematic diagram of the structure of the track bearing on the vibrating screen in an embodiment of the present invention;

[0134] Fig. 27 It is a schematic diagram of the structure of a vibration guide rail in an embodiment of the present invention;

[0135] Fig.28 It is a structural schematic diagram of a linkage component in an embodiment of the present invention;

[0136] Fig.29 The structure of the air supply system in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0137] Fig.30 The structure of the air supply system in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0138] Fig.31 Schematic diagram of the structure of the baffle in the embodiment of the present invention;

[0139] Fig.32 A schematic diagram of the structure of a fan housing in an embodiment of the present invention;

[0140] Fig.33 Schematic diagram of the installation structure of the wind shield in an embodiment of the present invention;

[0141] Fig.34 is a schematic cross-sectional view of a fan structure in an embodiment of the present invention;

[0142] Fig.35 A schematic diagram of the structure of a fan shaft in an embodiment of the present invention;

[0143] Fig.36 A three-dimensional diagram of a fan structure in an embodiment of the present invention;

[0144] Fig.37 The structure of the cleaning transmission system in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0145] Fig.38 for Fig.37 A schematic diagram of the structure of the tensioning assembly at S in the middle;

[0146] Fig.39 The structure of the cleaning transmission system in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0147] Fig.40 is a schematic diagram of the structure of a chopper in an embodiment of the present invention;

[0148] Fig.41 It is a structural schematic diagram of a fixed knife seat in an embodiment of the present invention;

[0149] Fig.42 It is a structural schematic diagram of the movable knife roller in an embodiment of the present invention;

[0150] Fig.43 It is a schematic diagram of the distribution structure of the moving knife seat after the moving knife roller is unfolded along its generatrix in an embodiment of the present invention;

[0151] Fig.44 It is a structural schematic diagram of the movable knife seat in an embodiment of the present invention;

[0152] Fig.45 It is a schematic diagram of the assembly structure of the movable blade in an embodiment of the present invention;

[0153] Fig.46 Schematic diagram of the structure of the anti-entanglement ring in an embodiment of the present invention;

[0154] Fig.47 It is a schematic diagram of the assembly structure of the spreading structure in an embodiment of the present invention;

[0155] Fig.48 Schematic diagram of the structure of the grass dividing board in the embodiment of the present invention.

[0156] Description of reference numerals:

[0157] H, vibrating screen; M, seed collection area; N, debris collection area; W, working area; D, weed removal area; K, anti-entanglement ring;

[0158] 1. Frame; 2. Vehicle frame; 3. Travel mechanism; 41. Cutting table; 42. Crop conveying structure; 51. Engine; 52. Gearbox; 61. Granary; 62. Grain unloading barrel; 7. Cab; 8. Dust cover;

[0159] 2a, first roller; 3a, second roller; 4a, roller shaft; 5a, web plate; 51a, adjustment hole; 52a, limit groove; 53a, web plate seat; 6a, threshing tooth rod; 7a, toggle tooth; 8a, connecting plate; 9a, anti-entanglement ring;

[0160] 11b, assembly beam; 110b, assembly hole; 111b, positioning pin; 12b, support beam; 2b, first concave screen; 21b, feeding port; 3b, second concave screen; 4b, side guard plate; 41b, steel wire; 5b, connecting beam; 50b, second mounting hole; 501b, positioning hole; 51b, grid bar; 6b, transition port; 7b, transition screen; 8b, reinforcing rib; 9b, sealing plate; 91b, adjustment plate; 92b, mounting plate; 10b, notch;

[0161] 2c, first tube cover; 21c, cover body; 211c, top cover; 212c, side top plate; 22c, mounting frame; 23c, handle; 24c, grass guide plate; 3c, second tube cover; 9c, fastener; 91c, hand-held part; 92c, threaded part; 93c, washer;

[0162] 1d, mounting plate; 11d, mounting surface; 12d, assembly surface; 2d, screen teeth; 3d, screen fork unit; 4d, screen fork group; 5d, pressing plate; 6d, corrugated plate; 7d, fish scale screen; 8d, lower screen;

[0163] 1e, partition plate; 11e, flange; 2e, connecting plate; 3e, front curtain; 4e, rear curtain; 5e, seed bottom shell; 6e, miscellaneous bottom shell;

[0164] 1f, sealing plate; 2f, front material plate; 3f, fan housing; 31f, first air inlet; 32f, second air inlet; 33f, air outlet; 4f, visible part; 5f, screen front plate; 6f, first shielding part; 7f, second shielding part; 8f, butterfly nut;

[0165] 2g, bearing seat; 3g, transmission shaft; 4g, eccentric bearing; 5g, driving wheel; 61g, track bearing; 62g, vibration track; 7g, linkage; 71g, ring sleeve; 72g, linkage plate; 8g, counterweight; 9g, protective plate;

[0166] 1h, screen frame; 11h, rear slide plate; 12h, adjustment plate; 2h, tail screen; 21h, mounting seat; 22h, tail screen piece;

[0167] 1i, fan shaft; 11i, flat groove; 2i, fan blade; 3i, fan blade bracket; 31i, installation section; 32i, fixing section; 4i, reinforcement plate; 51i, first wind shield; 52i, second wind shield;

[0168] 1j, rear sealing plate; 2j, tail cover; 3j, flow blocking member; 31j, threshing sealing plate; 32j, tail cover sealing plate; 41j, upper air guide plate; 42j, lower air guide plate; 5j, discharge port;

[0169] 1k, ring plate; 11k, bottom plate; 12k, side plate; 2k, card plate; 3k, slot; 4k, obstacle removal slot; 5k, assembly hole;

[0170] 1p, grass dividing plate; 11p, extension section; 2p, first grass guide plate; 3p, second grass guide plate; 10p, grass discharge port;

[0171] 1r, moving knife roller; 2r, moving blade; 3r, fixed knife seat; 4r, fixed blade; 5r, moving knife seat; 10r, left side wall; 11r, right side wall;

[0172] 1s, output pulley; 10s, intermediate transmission shaft; 11s, input pulley; 2s, first threshing pulley; 3s, second threshing pulley; 4s, chopper pulley; 51s, fan pulley; 52s, grain pulley; 521s, grain auger; 522s, granary auger; 53s, miscellaneous pulley; 531s, miscellaneous auger; 532s, re-threshing auger; 6s, screening pulley; 71s, first transition pulley; 72s, second transition pulley; 81s, tension arm; 82s, tension pulley; 83s, pull rod; 84s, tension spring; 9s, reversing gear box. DETAILED DESCRIPTION

[0173] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0174] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0175] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0176] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0177] Example 1

[0178] This embodiment provides a combine harvester, such as Figure 1 As shown, it includes a frame 2, a traveling mechanism 3 is arranged under the chassis of the frame 2, and a power component, a harvesting component, a cab 7, a threshing and cleaning system, a cleaning transmission system and a grain storage component are arranged above the chassis of the frame 2.

[0179] The harvesting assembly includes a header 41 and a crop conveying structure 42, and the cab 7 and the crop conveying structure 42 are arranged in parallel at the front of the frame 2. The threshing and cleaning system includes a double-helix threshing and conveying system, which has a "J"-shaped threshing direction. The threshing and cleaning system and the grain storage assembly are arranged in parallel at the rear of the frame 1, and the crop conveying structure 42 is connected to the feeding port of the threshing and cleaning system, and the feeding port is arranged at the front end of the threshing and cleaning system and close to the grain storage assembly. The spreading structure in the threshing and cleaning system is arranged at the rear end of the threshing and cleaning system and close to the grain storage assembly. The power assembly includes an engine 51 and a gearbox 52, and the gearbox 52 is arranged at the front of the frame 2 and below the crop conveying structure 42. The engine 51 is fixed on the chassis of the frame 2 between the cab 7 and the grain storage assembly. The engine 51 is suitable for driving the cleaning transmission system, and the cleaning transmission system is arranged on the threshing and cleaning system and is located on the side facing away from the grain storage assembly. The feeding port is set in the middle of the frame 2, so that the connection port between the crop conveying structure 42 connected thereto and the cutting platform 41 is located near the middle of the cutting platform 41, and the cutting platform 41 is fed with crops more evenly; at the same time, the spreading structure is set close to the grain storage component, and the "J" threshing direction of the double-helix threshing conveying system is used to allow the crops to enter from the middle of the front end of the harvester and be spread out from the middle of the tail end, ensuring the stability of the center of gravity of the combine harvester. The cleaning transmission system is set on the outside of the threshing system, with centralized transmission, which is easy to install and debug. The whole machine has a compact structure and occupies a small space. It always keeps the center of gravity stable during idling and harvesting operations, has high maneuverability, and significant operating efficiency.

[0180] like Figure 2As shown, the grain storage assembly includes a grain bin 61 and a grain discharge barrel 62. A lifting auger is arranged between the grain bin 61 and the threshing and cleaning system. Clean grains from the threshing and cleaning system are transported into the grain bin 61 through the lifting auger. In this embodiment, the lifting auger is located between the grain bin 61 and the threshing and cleaning system. The grain discharge barrel 62 is erected above the grain bin 61 and the threshing and cleaning system, and is fixed on the threshing and cleaning system. Figure 2 As shown, a dust cover 8 is provided on the water tank located outside the cab 7.

[0181] In this embodiment, the threshing and cleaning system includes a double-screw threshing and conveying system, a screening system and an air supply system. Figure 3 As shown, the double-spiral threshing and conveying system includes two threshing spaces arranged horizontally and spaced apart in the front and back direction of the harvester. The threshing space is a hollow cylindrical installation cavity surrounded by a concave plate screen and a cylinder cover, and a roller is installed in each installation cavity. Guide members are arranged at intervals on the inner wall surface of the cylinder cover to guide the crops entering the threshing space to move in a directional manner around the axis. When the roller rotates, the crops are driven to move and enter the second threshing space from the first threshing space under the guidance of the guide member. The working areas of the two threshing spaces are the same length. Therefore, the crop threshing path passes through the length of the two rollers and can be fully threshed. The two threshing spaces are arranged horizontally at intervals, making the structure on the frame more compact. The two threshing working areas are the same length, and a sufficiently long threshing path can be guaranteed, which fully guarantees the threshing effect while ensuring the overall maneuverability of the harvester.

[0182] like Figure 4 As shown, the two concave screens are respectively a first concave screen 2b with a feeding port 21b and a second concave screen 3b arranged adjacent to the first concave screen 2b in the crop transmission direction, and the first concave screen 2b and the second concave screen 3b have the same length, that is, the length of the screening area is the same. The inner screen surface of each concave screen is in an arc shape, and the axes of the two concave screens are parallel to each other and fixed on the frame 1 at intervals in the horizontal direction.

[0183] like Figure 3As shown, each concave screen includes two side guard plates 4b, two connecting beams 5b, a plurality of grid bars 51b, a plurality of steel wires 41b and a plurality of reinforcing ribs 8b. The two side guard plates 4b are respectively in the shape of arcs, the side guard plates 4b are coaxial and arranged opposite to each other, the two ends of the two side guard plates 4b are welded and fixed together by connecting beams 5b, and an installation space is enclosed between the two side guard plates 4b and the two connecting beams 5b. In this embodiment, the grid bars 51b are arranged in parallel with the connecting beams 5b and are fixed across the two side guard plates 4b, the spacing between adjacent grid bars 51b is the same, and they are evenly spaced and radially distributed along the side guard plates 4b, that is, the plane where each grid bar 51b is located intersects on the axis of the concave screen, and the center of the arc where the side guard plates 4b are located is located on the axis. A plurality of through holes are evenly spaced apart on each grid bar 51b. The steel wire 41b is arranged parallel to the side guard plate 4b and passes through the through holes on each grid bar 51b in sequence. The two ends of the steel wire 41b are fixed on the connecting beam 5b or the grid bar 51b respectively. All grid bars 51b and steel wires 41b cross each other to form a plurality of grid units, and all grid units together form a grid-like screen surface. In this embodiment, the reinforcing ribs 8b are arranged parallel to the side guard plates 4b and fixed on the outer screen surface at intervals. The grid bars 51b are welded and fixed to the side guard plates 4b on both sides, and the reinforcing ribs 8b are also fixed to all grid bars 51b by welding.

[0184] In this embodiment, the separation angles of the first concave screen 2b and the second concave screen 3b are both 180 degrees, that is, the side guard plate 4b is in a semicircular arc shape as a whole. When the separation angle is greater than 180 degrees, the upper space of the concave screen is wasted. Secondly, the upper part is curved, and the grains are thrown out of the concave screen from the upper part, and may fall back into the concave screen when falling, affecting the cleaning effect. When it is less than 180 degrees, the area of ​​the screen surface is reduced, which also affects the cleaning effect.

[0185] In this embodiment, the area of ​​the grid unit in the first concave screen 2b is smaller than the area of ​​the grid unit in the second concave screen 3b, so that only crop grains pass through the first concave screen 2b, and the second concave screen is suitable for passing grains and other small debris, so as to prevent the debris from entraining the grains and discharging them from the grass discharge port, causing losses. Specifically, when the spacing between two adjacent grid bars 51b in the two concave screens is the same, the spacing between two adjacent steel wires 41b in the second concave screen 3b is greater than the spacing between two adjacent steel wires 41b in the first concave screen 2b; or, when the spacing between two adjacent steel wires 41b in the two concave screens is the same, the spacing between two adjacent grid bars 51b in the second concave screen 3b is greater than the spacing between two adjacent grid bars 51b in the first concave screen 2b; or the spacing between adjacent grid bars 51b and adjacent steel wires 41b in the second concave screen 3b is greater than the spacing between adjacent grid bars 51b and adjacent steel wires 41b in the first concave screen 2b. Of course, the steel wires 41b in each concave screen can be withdrawn at intervals as needed to increase the area of ​​the grid unit.

[0186] For example Figure 3 As shown, transition ports 6b are respectively provided at one end of the two concave plate screens on the same side of the frame in the radial direction, and the two transition ports 6b are arranged opposite to each other, and the two concave plate screens are connected to each other through the transition ports 6b. The transition plate screen 7b is laid between the two transition ports 6b, and the transition plate screen 7b includes a screen frame, which is a square structure, and the grid bars 51b are evenly spaced in the horizontal direction in the screen frame. Similarly, a plurality of through holes are evenly spaced on any grid bar 51b, and the steel wire 41b passes through the through holes on the grid bar 51b in the longitudinal direction in sequence. Among them, the width direction of the square screen frame is the horizontal direction, and the length direction is the longitudinal direction. The feeding port 21b is arranged on the side of the first concave plate screen 2b opposite to the transition port 6b and away from the transition port 6b, and the transmission path of the crop from the feeding port 21b into the concave plate screen is in the shape of a "J".

[0187] like Figure 4 As shown, three assembly beams 11b are arranged at intervals on the frame 1, and the connecting beams 5b on both sides of the first concave screen 2b are overlapped and fixed between the first and second assembly beams 11b. Similarly, the connecting beams 5b on both sides of the second concave screen are overlapped and fixed between the second and third assembly beams 11b. The transition port 6b is opened near one side of the frame 1. This structural design can make the layout of the two concave screens on the harvester frame 1 compact while improving the path of the crops passing through the concave screens for threshing and screening, greatly improving the overall mobility and threshing effect of the harvester.

[0188] A hollow cylindrical installation cavity is formed between the drum cover and the corresponding concave screen, and the installation cavity forms a threshing space. Figure 5As shown in the figure, a first threshing space is formed between the first cylinder cover 2c and the first concave sieve 2b. The first cylinder 2a is installed in the first threshing space, and a gap is provided between the end face of the first concave sieve 2b and the end face of the stirring teeth of the first cylinder 2a. A second threshing space is formed between the second cylinder cover 3c and the second concave sieve 3b. The second cylinder 3a is installed in the second threshing space. At the same time, a gap is provided between the end face of the second concave sieve 3b and the end face of the stirring teeth of the second cylinder 3a. The transition port 6b communicates with the first threshing space and the second threshing space, and the crop enters the second threshing space from the first threshing space via the transition sieve plate 7b.

[0189] As Figure 6 shown in the figure, a limit adjustment structure is provided at the notch 10b formed between the outer sieve surface of the two concave sieves and the transition sieve plate. The limit adjustment structure is detachably fixed on the first concave sieve 2b and the second concave sieve 3b on both sides. When the limit adjustment structure is not provided, some crops fall from the notch 10b into the lower vibrating sieve only after passing through the first concave sieve 2b and directly enter the subsequent process. When the limit adjustment structure is provided, the crop enters the second concave sieve 3b from the first concave sieve 2b via the transition sieve plate 7b through a complete "J" - shaped path, and the transmission path is longer, and the threshing and screening effect is better.

[0190] In this embodiment, the limit adjustment structure includes a sealing plate 9b, and the shape of the sealing plate 9b matches the shape of the notch 10b. Further, it also includes an adjusting member connecting the sealing plate 9b and the two concave sieves. As Figure 6 and Figure 7 shown in the figure, the adjusting member includes an adjusting plate 91b and two mounting plates 92b fixed on both sides of the adjusting plate 91b. The plate surface of the adjusting plate 91b is in an arc shape matching the concave sieve to which it is fixed. The two mounting plates 92b are bent along the adjusting plate 91b and are respectively fixed on opposite sides of the adjusting plate 91b. One mounting plate 92b is used for fixedly connecting to the concave sieve, and the other mounting plate 92b is used for fixedly connecting to the sealing plate 9b. In this embodiment, the cross - section of the adjusting member is in a C - shape, and the adjusting plate 91b and the mounting plates 92b on both sides are integrally formed. The plate surface of the adjusting plate 91b is suitable for partially blocking the transition port 6b. The adjusting plate 91b can select plate surface sizes with different widths according to needs to adjust the size of the transition port 6b for the passing crop, so as to partially extend the transmission path of the crop and extend the threshing, separation and screening time of the crop.

[0191] As Figure 8 shown in the figure, the radian of the cross - section of the concave sieve and the cylinder cover is 180 degrees. A plurality of locking assemblies, and any one of the locking assemblies is adapted to sequentially pass through the mounting frame 22c and the connecting beam 5b and be locked and fixed on the assembly beam 11b.

[0192] The connecting beam 5b is arranged horizontally, and can be overlapped with the horizontal mounting surface of the assembly beam 11b on the frame 1. During installation, it is only necessary to place the concave plate screen between the two assembly beams 11b and place the connecting beam 5b on the assembly beam 11b. There is no need for welding and fixing, thus reducing a lot of manpower and material resources.

[0193] like Figure 8 As shown, the mounting frame 22c is square, and the cover 21c is hinged on one side of the mounting frame 22c and is suitable for buckling on the mounting frame 22c. The frame surface of the mounting frame 22c is suitable for overlapping and fitting with the surface of the connecting beam 5b, which is convenient for assembly.

[0194] like Fig.33 As shown, the cover body 21c includes an arc-shaped top cover 211c and two side top plates 212c blocking the top cover 211c on both sides. The top cover 211c has an arc of 180 degrees, and guide members are evenly spaced on the inner wall surface of the top cover 211c. In this embodiment, the guide members are grass guide plates 24c, which are arc-shaped plates arranged along the arc surface of the top cover 211c. Fig.34 As shown, the grass guide plate 24c is set at a certain angle with the axis of the cylinder cover to guide the crops entering the threshing space in the same direction. And in order to meet the "J"-shaped trend of the crops between the two threshing spaces, as shown in FIG. Fig.34 As shown, in this embodiment, the grass guide plates 24c in the first barrel cover 2c and the second barrel cover 3c are axially symmetrically arranged about the middle assembly beam 11b, that is, the guiding directions of the grass guide plates 24c in the two barrel covers are opposite.

[0195] For example Figure 8 As shown, the locking assembly includes a fastener 9c and a washer 93c. In this embodiment, the fastener 9c is made of hexagonal steel, and the fastener 9c includes a hexagonal hand-held portion 91c and a threaded portion 92c formed below the hand-held portion 91c. Correspondingly, an assembly hole 110b threadedly matched with the threaded portion 92c is provided on the assembly beam 11b, a plurality of first mounting holes (not shown in the figure) are arranged at intervals along the frame of the mounting frame 22c, and a plurality of second mounting holes 50b are arranged at intervals on the connecting beam 5b. The first mounting hole, the second mounting hole 50b and the assembly hole 110b are arranged correspondingly, and the fastener 9c passes through the first mounting hole and the second mounting hole 50b in sequence and is fixed in the assembly hole 110b. Washers 93c are arranged between the mounting frame 22c and the fastener 9c, and between the connecting beam 5b and the assembly beam 11b. The washer 93c is coaxially sleeved on the threaded portion 92c of the fastener 9c. In this embodiment, the aperture of the corresponding first mounting hole is smaller than the aperture of the second mounting hole 50b, so as to correct the slight misalignment between the concave plate screen and the cylinder cover. Further, the first mounting hole can also be provided with an internal thread to match the external thread of the fastener 9c to increase the locking strength.

[0196] To improve the installation accuracy, a positioning component is also provided, such as Figure 8 As shown, the positioning component includes at least one positioning pin 111b, which is arranged on the assembly beam 11b. In this embodiment, a positioning pin 111b is arranged at each end of each assembly beam 11b, and the positioning pin 111b is cylindrical. Positioning holes 501b are respectively formed on the connecting beam 5b and the mounting frame 22c, and the positioning holes 501b are adapted to be sleeved on the corresponding positioning pins 111b. The apertures of the positioning holes 501b on the connecting beam 5b and the mounting frame 22c are the same and are slightly larger than the diameter of the positioning pin 111b, so as to correct the slight misalignment of the first mounting hole and the second mounting hole 50b relative to the assembly hole 110b.

[0197] The concave screen and the cylinder cover are integrally assembled onto the assembly beam 11b of the harvester frame 1 through the fastener 9c, with a simple structure and easy installation operation, saving manpower and material resources.

[0198] As Figure 5 or Fig. 9 As shown, the axes of the two drums are parallel to each other and are arranged at intervals in the crop conveying direction. A plurality of toggling members are arranged at intervals along the drum shaft 4a on any one drum, and an operation area W is formed between the two toggling members at the two ends of the drum. The lengths of the two operation areas W are the same as the lengths of the corresponding concave screens. In this embodiment, the lengths of the two concave screens are the same. As Fig.30 As shown, the crop first enters the first drum 2a from the feeding port 21b, is threshed by the rotation of the first drum 2a and is spirally conveyed into the second drum 3a located at the rear, then is threshed by the rotation of the second drum 3a, and finally is spirally conveyed to the straw discharging area D to discharge the threshed straw. The crop spirally travels in the double-drum structure and has an inverted U-shaped path, and the travel length is the sum of the lengths of the two drums. The threshing travel is long and the threshing effect is obvious. One end of the two drums is flush and the overall axial directions are parallel, without occupying extra space, making the overall structure of the combine harvester compact.

[0199] The overall structures of the first drum 2a and the second drum 3a are the same. The difference is that a section of straw discharging area D is added at the end of the crop travel of the second drum 3a. As Fig.31 and Fig.32 As shown, any one drum includes a drum shaft 4a, several disc plates 5a and a plurality of threshing tooth rods 6a. In this embodiment, three disc plates 5a are arranged in the operation area W of both the first drum 2a and the second drum 3a, and one disc plate 5a is arranged in the straw discharging area D of the second drum 3a. All the disc plates 5a are evenly and spacedly fixed on the corresponding drum shaft 4a through the disc plate 5a seats.

[0200] A plurality of mounting parts are arranged at intervals on the outer circumference of any web 5a. In this embodiment, any mounting part includes a limiting groove 52a and a plurality of groups of adjustment holes 51a arranged on the outer circumference of the limiting groove 52a. The groove shape of the limiting groove 52a matches the threshing gear rod 6a and is suitable for the threshing gear rod 6a to be embedded. The connecting rod is welded and fixed on the threshing gear rod 6a. The threshing gear rod 6a and the web 5a are detachably connected together through the connecting plate 8a. The connecting plate 8a is provided with through holes corresponding to any group of adjustment holes 51a. Bolts pass through the corresponding adjustment holes 51a and the through holes on the connecting plate 8a to fix the threshing gear rod 6a on the web 5a. The angle adjustment of the toggle member on the threshing gear rod 6a is achieved by fixing the bolts in different adjustment holes 51a.

[0201] like Fig.31 As shown, in this embodiment, eight limiting grooves 52a are provided on any web 5a, six of which are evenly spaced on the circumference of the web 5a, and the other two limiting grooves 52a are used as spare grooves and are arranged oppositely on the outer circumference of the web 5a. In this embodiment, six threshing tooth rods 6a are provided, which are respectively fixed in the six limiting grooves 52a evenly distributed on the circumference of the web 5a, and a plurality of toggle members are arranged at intervals on each threshing tooth rod 6a. In this embodiment, the toggle members are cylindrical toggle teeth 7a. The toggle teeth 7a on adjacent threshing tooth rods 6a are arranged at intervals in the axial direction of the drum to enhance the threshing effect.

[0202] All the shifting teeth 7a in the working area W have the same size. Figure 5 As shown in FIG. 1 , the tilt angles of the toggle teeth 7a on the same drum relative to the drum axis 4a are the same, forming a radial structure. The distance from the end face of any toggle tooth 7a to the axis of the drum forms the rotation radius of the drum. When the drum rotates, the end faces of all the toggle teeth 7a together form a cylindrical surface. In this embodiment, Figure 5 As shown, the height of the lowest point of the cylindrical surface of the second roller 3a from the horizontal plane is greater than the height of the lowest point of the cylindrical surface of the first roller 2a from the horizontal plane. Furthermore, the rotation radius of the second roller 3a is smaller than the rotation radius of the first roller 2a, and the height of the roller shaft 4a of the second roller 3a is higher than the height of the roller shaft 4a of the first roller 2a, and the highest points of the rotating cylindrical surfaces of the second roller 3a and the first roller 2a are at the same horizontal height. This structural design increases the distance between the rear contacting roller and the horizontal vibrating screen below, so that the debris falling from the rear contacting roller to the vibrating screen can be fully screened by wind.

[0203] In the path of crops, such as Fig.31 and Fig.32 As shown, the first roller 2a and the second roller 3a are respectively provided with an anti-entanglement ring 9a at the transfer end, that is, Fig. 9As shown, the first roller 2a is fixed to one end of the roller shaft 4a of the right frame 1 and an anti-winding ring 9a is provided, and the second roller 3a is fixed to one end of the roller shaft 4a of the right frame 1 and an anti-winding ring 9a is provided to prevent crop straw from being entangled on the roller shaft 4a and hindering crop transportation.

[0204] The working process of the double screw conveying system in this embodiment is as follows:

[0205] The crops enter the first threshing space from the feeding port 21b, and are stirred by the rotation of the toggle member of the drum. The crops are centrifugally moved along the inner wall of the concave plate screen and the drum cover, and guided by the guide member on the drum cover, and make spiral motion along the set direction. From the feeding port 21b, the crops move along the first threshing space to the transition port, enter the second threshing space through the transition plate screen, and are threshed by the spiral guide motion in the opposite direction to that in the first threshing space, and enter the grass discharge area D. The crops are threshed in spiral motion in both threshing spaces, and move along the "J"-shaped path formed by the two threshing spaces, with a long travel distance and more complete threshing.

[0206] like Fig.15 , Fig.19 , Fig.25 and Fig.26 As shown, the screening system includes a vibrating screen H, a front sealing structure, a grain separation structure and a driving structure. The vibrating screen H has an upper screen area and a lower screen area 8d. A lifting structure is set at the tail end of the corrugated plate 6d in the upper screen area to increase the drop between the corrugated plate 6d and the fish scale screen 7d, and cooperate with the tail screen 2h at the tail end to form a two-stage lift, which can fully shake the agglomerated crops loose and prevent the crop straw from entraining and entraining the grains and causing waste. At the same time, a front sealing structure is set at the front end of the corrugated plate 6d to prevent the grains from being thrown out by the vibrating screen H. A grain separation structure is set between the grain collection area M and the debris collection area N below the vibrating screen H to effectively separate the clean grains from the debris such as straw, so that the grain collection is more complete and cleaner, avoiding waste and improving the screening efficiency.

[0207] like Fig.15 or Fig.19 As shown, the screen frame 1h of the vibrating screen H is funnel-shaped as a whole. In this embodiment, the lifting structure is a shaking screen. In the upper screen area, a corrugated plate 6d, a shaking screen, at least one section of fish scale screen 7d and a tail screen 2h are sequentially arranged along the crop moving direction. In the lower screen area, a lower screen 8d is arranged corresponding to the fish scale screen 7d. In this embodiment, the fish scale screen 7d is arranged in two sections at intervals along the horizontal direction, and the fish scale screen pieces in the two sections of the fish scale screen 7d are arranged at an angle. For example, the fish scale screen pieces on the first section of the fish scale screen 7d close to the corrugated plate 6d are arranged vertically upward, and the fish scale screen pieces on the second section of the fish scale screen 7d close to the tail screen 2h are arranged inclined toward one side of the tail screen 2h. As shown in FIG. Figure 1As shown, the tail screen 2h includes a mounting seat 21h and a plurality of tail screen 2h pieces, the mounting seat 21h and the fish scale screen pieces in the adjacent second-stage fish scale screen 7d are tilted and fixed on the screen frame 1h, and the plurality of tail screen 2h pieces extend obliquely upward from the mounting seat 21h in the crop moving direction and are evenly spaced and fixed on the mounting seat 21h in the horizontal direction. The upward tail screen 2h pieces form a second-stage lifting structure to fully shake out and loosen crop debris.

[0208] like Fig.19 As shown, a rear slide plate 11h is provided on the screen frame 1h at one end of the tail screen 2h, as well as an adjustment plate 12h slidably provided along the plate surface of the rear slide plate 11h. The rear slide plate 11h and the adjustment plate 12h are fitted face to face. Three through holes (not shown in the figure) are evenly spaced on the rear slide plate 11h, and three long waist holes are provided on the corresponding adjustment plate 12h. The adjustment plate 12h is provided on the outer side of the rear slide plate 11h, and is penetrated through the long waist holes and fixed in the through holes of the rear slide plate 11h by bolts. After loosening the bolts, the adjustment plate 12h can slide up and down along the plate surface of the rear slide plate 11h to adjust the size of the tail crop outlet.

[0209] like Fig.16 As shown, the shaking screen includes a mounting member and a plurality of screen teeth 2d. In this embodiment, the mounting member is a plate-shaped structure, namely, a mounting plate 1d. The mounting plate 1d has a mounting surface 12d and a mounting surface 11d which is opposite to the mounting surface 12d and is arranged at an acute angle to the mounting surface 12d. In this embodiment, as shown in FIG. Fig.17 As shown, the middle of the mounting plate 1d is bent to form a slope with a certain inclination angle, and the slope forms a mounting surface 11d for fixing the screen teeth 2d, and the lower bottom surface of the mounting plate 1d forms an assembly surface 12d, that is, Fig.19 As shown, when the shaking screen is assembled to the end of the corrugated plate 6d, the assembly surface 12d is fixed to the corrugated plate 6d. The screen teeth 2d extend along the opening direction of the angle formed between the assembly surface 12d and the mounting surface 11d, and one end is a fixed end, which is fixed on the mounting surface 11d at intervals, and the other end is a free end, which is suspended. When the vibration screen vibrates back and forth as a whole, the crops slide from the corrugated plate 6d to the shaking screen, and are shaken up by the suspended screen teeth 2d, and then fall onto the fish scale screen 7d, so as to shake and loosen the crops. In addition, the shaking screen can be set on the corrugated plate 6d at different inclination angles according to different needs, making full use of the space, so that the screening system can ensure the screening effect while being more compact.

[0210] like Fig.18As shown, in this embodiment, the sieve teeth 2d are cylindrical structures, and of course, they can also be sheet-like structures, depending on the specific situation. Any sieve tooth 2d is bent in a stepped manner and is adapted to guide the crop to travel along the sieve tooth 2d from the fixed end located on the mounting surface 11d to the free end. The fixed ends of the two sieve teeth 2d are fixedly connected to form a U-shaped sieve fork unit 3d. The two sieve fork units 3d are stacked, and the vertical part of the U-shape of one sieve fork unit is lapped and fixed on one sieve tooth 2d of the other sieve fork unit 3d to form a sieve fork group 4d. A plurality of the sieve fork groups 4d are evenly spaced on the mounting surface 11d. As Fig.16 shown, all the sieve fork groups 4d are pressed and welded and fixed on the mounting surface 11d of the mounting plate 1d through a pressing plate 5d. The length of each sieve tooth 2d suspended in the air is relatively long. On the one hand, it can increase the height of the crop falling onto the scale sieve 7d, and on the other hand, it can improve the elasticity of the sieve tooth 2d, making the shaking effect more obvious when it moves with the vibrating sieve.

[0211] In this embodiment, the mounting plate 1d, the sieve teeth 2d, and the pressing plate 5d are all made of aluminum alloy material to reduce the weight of the entire screening system, thereby reducing the vibration inertia.

[0212] A front material plate 2f for guiding the crop grains to slide down is arranged below the threshing cylinder. One end of the front material plate 2f is fixed to the front end of the frame 1, and the plate surface is inclined downward from the front end of the frame 1 to the tail of the frame 1. The other end of the front material plate 2f is located above the vibrating sieve H and within the orthographic projection of the vibrating sieve H on the horizontal plane.

[0213] As Fig. 20 shown, the front sealing structure includes a sealing member, a first shielding member 6f, and a second shielding member 7f. The sealing member is fixed between the front material plate 2f and the fan housing 3f below the front material plate 2f. The width of the sealing member is not less than the width of the sieve surface of the vibrating sieve H between the front material plate 2f and the fan housing 3f, and the opposite sides in the width direction of the sealing member respectively correspond to and are provided with gaps with the left and right side walls of the frame 1. In this embodiment, the sealing member is a sealing plate 1f. The upper end of the sealing plate 1f is turned over, and the turned edge is fixed to the lower surface of the front material plate 2f through bolts. The lower end of the sealing plate 1f is fixed to the turned edge of the fan housing 3f through bolts. The gaps between the two side edges of the sealing plate 1f and the left and right side walls of the frame 1 are filled and sealed with sealant.

[0214] In this embodiment, as Fig. 20 or Fig.21 shown, the sealing plate 1f is bent in a section. The section close to the front material plate 2f is vertically arranged, and the section close to the fan housing 3f is inclined, forming a slope with the outer wall surface of the fan housing 3f, which is convenient for guiding the crop grains leaking from the vibrating sieve H. As Fig. 20As shown, at least one observation port is provided in the vertical section of the sealing plate 1f. In this embodiment, two observation ports are provided, and a visual component 4f is fixed to each observation port through a butterfly nut 8f for observing the crop accumulation condition of the vibrating screen H. The visual component 4f can be a transparent acrylic plate or a glass plate, preferably an acrylic plate, which is light and not easily broken.

[0215] The sealing plate 1f is used to block the opening connected to the vibrating screen H formed by the front material plate 2f located above, the fan casing 3f located below, and the left and right side walls of the frame 1. The crop grains are blocked by the sealing plate 1f and fall back along the fan casing 3f to the grain collecting area below the vibrating screen H, so as to avoid the crop grains flying out of the opening and falling to the ground, causing waste.

[0216] Furthermore, in order to prevent the accumulation of crop grains between the fan housing 3f and the sealing plate 1f, as shown in FIG. Fig.21 As shown, a first shielding member 6f is also provided, one end of the first shielding member 6f is fixed to one end of the front material plate 2f located above the vibrating screen H, and the other end of the first shielding member 6f is fixed to the screen front plate 5f located at the front end of the vibrating screen H, and the first shielding member 6f is arranged at a certain angle to the screen surface of the vibrating screen H. The width of the first shielding member 6f is not less than the screen surface width of the vibrating screen H, and the first shielding member 6f is a flexible member, and after the two ends of the first shielding member 6f are fixed, there is still an extension margin for the reciprocating vibration of the vibrating screen H to avoid hindering the movement of the vibrating screen H.

[0217] like Fig.21 As shown, a second shielding member 7f is fixed to one end of the first shielding member 6f on the front material plate 2f, and the other end of the second shielding member 7f is a free end, which naturally hangs down to the screen surface of the vibrating screen H, and double-layer isolation is performed by two shielding members arranged in front and behind.

[0218] In this embodiment, the first shielding member 6f and the second shielding member 7f are both canvas.

[0219] like Fig. 22 As shown, the seed separation structure includes a partition and a front curtain 3e. Fig.15 As shown, the isolating member is arranged between the seed collecting area M and the debris collecting area N and is fixed on the housing of the vibrating screen. The width of the isolating member is the same as the width of the seed collecting area M and the debris collecting area N.

[0220] In this embodiment, Fig. 22As shown in the figure, the separator includes a partition plate 1e and connecting plates 2e arranged on both sides of the partition plate 1e. The width of the connecting plates 2e is the same as that of the partition plate 1e, and the connecting plates 2e and the partition plate 1e are arranged in a U-shaped structure. One end of the connecting plate 2e is fixed to the partition plate 1e, and the other end is fixed to the housing of the vibrating screen. The plate surface of the partition plate 1e extends obliquely upward from the grain collection area M to above the residue collection area N. The two side plate surfaces of the partition plate 1e form isolation surfaces. The front baffle 3e extends in the same direction as the plate surface of the partition plate 1e. One end is fixed to the partition plate 1e, and the other end is placed on the grain bottom shell 5e in the grain collection area M to block the opening formed between the partition plate 1e and the grain bottom shell 5e, which connects the grain collection area M and the residue collection area N. This allows the air blown by the fan to travel along the front baffle 3e and the partition plate 1e and blow out from the opening formed between the upper end of the partition plate 1e and the lower sieve 8d, avoiding the return air from carrying residues into the grain collection area M and contaminating the grains in the granary. At the same time, it can also increase the air volume blown to the end of the lower sieve 8d and improve the effect of winnowing.

[0221] The front baffle 3e is a rubber baffle or a canvas baffle. In this embodiment, the front baffle 3e is a rubber baffle, such as Fig. 22 or Fig.15 As shown in the figure, part of the rubber baffle is placed on the grain bottom shell 5e and naturally hangs down along the surface of the grain bottom shell 5e. The rubber baffle in contact with the grain bottom shell 5e has a certain adhesion force, which can better prevent the baffle from being blown up by the fan.

[0222] such as Fig. 22 As shown in the figure, a rear baffle 4e is also provided in the residue collection area N. One end of the rear baffle 4e is fixed to the partition plate 1e, and the other end is placed on the residue bottom shell 6e in the residue collection area N, further preventing the return air from lifting the front baffle 3e and causing residues to enter the grain collection area M. The width of the rear baffle 4e is less than the straight-line distance from its fixed point on the partition plate 1e to the auger in the residue collection area N, avoiding entanglement with the rear baffle 4e during the rotation of the auger and causing failures. Similarly, the rear baffle 4e is a rubber baffle or a canvas baffle. In this embodiment, the rear baffle 4e is a rubber baffle, such as Fig. 22 or Fig.15 As shown in the figure, part of the rubber baffle is placed on the residue bottom shell 6e and naturally hangs down along the surface of the residue bottom shell 6e. The rubber baffle in contact with the residue bottom shell 6e has a certain adhesion force, which can better prevent the baffle from being blown up by the return air swirling along the inner wall surface of the residue bottom shell 6e.

[0223] The partition plate 1e, the front baffle 3e and the rear baffle 4e form a herringbone isolation structure erected between the grain collection area M and the residue collection area N, fully isolating the grain collection area M and the residue collection area N, avoiding cross-contamination, and ensuring the cleanliness of the grains entering the warehouse.

[0224] such as Fig.23As shown, the partition plate 1e is provided with a flange 11e at one end of the seed collection area M toward the debris collection area N, and the angle between the flange 11e and the plate surface of the partition plate 1e is an obtuse angle. The flange 11e is provided to guide the swirling wind traveling along the inner wall surface of the debris bottom shell 6e and the rear curtain 4e, and to prevent the crop debris entrained in the swirling wind from entering the seed collection area M through the opening between the partition plate 1e and the lower screen 8d.

[0225] As an alternative implementation of this embodiment, the rear curtain 4e may not be provided, and only the front curtain 3e may be provided.

[0226] like Fig.24 As shown, the driving structure includes two bearing seats 2g, a transmission shaft 3g, two eccentric bearings 4g and a driving wheel 5g. The frame of the harvester is composed of a plurality of vertically arranged support beams 12b and assembly beams erected between the support beams 12b. A frame housing is installed between adjacent beams, and a mounting cavity is formed in the housing. The vibrating screen H is installed in the mounting cavity.

[0227] like Fig.24 As shown, two bearing seats 2g are respectively fixed on the side walls of two symmetrical support beams 12b at the rear end of the frame, and an outer spherical bearing is installed in any bearing seat 2g, and the two ends of the transmission shaft 3g are respectively fixed in the outer spherical bearings. Two eccentric bearings 4g are fixed at the two ends of the transmission shaft 3g in a mirror image, one end of the vibrating screen H is fixed on the two eccentric bearings 4g, and the other end is set on the frame through a reciprocating guide structure. The driving wheel 5g is fixed on one end of the transmission shaft 3g, which is suitable for being driven by the driver of the harvester and driving the transmission shaft 3g to rotate. The bearing seat 2g is directly fixed on the support beam 12b of the frame to avoid transition connection, and the frame directly bears the gravity of the vibrating screen H and the inertial force of its reciprocating motion, so that the vibration of the vibrating screen H is more stable.

[0228] The reciprocating guide structure includes two track bearings 61g and a vibration track 62g corresponding to the two track bearings 61g. Fig.26 As shown, the track bearings 61g are symmetrically fixed on both sides of the vibrating screen H and away from one end of the transmission shaft 3g, and the two vibrating tracks 62g are symmetrically arranged on the frames on both sides of the vibrating screen H, as shown in FIG. Fig. 27 As shown, the vibration track 62g is composed of a bottom plate and side plates arranged on the bottom plate, a guide channel is formed between the two side plates, the guide direction of the vibration track 62g is set at an angle to the horizontal plane, and the track bearing 61g is slidably set in the vibration track 62g.

[0229] A linkage member 7g is provided between the vibrating screen H and the eccentric bearing 4g, such as Fig.28As shown, the linkage member 7g includes a ring sleeve 71g and a linkage plate 72g welded and fixed on the ring sleeve 71g, one end of the ring sleeve 71g is open and flanged, and the flange is perpendicular to the wall surface of the ring sleeve 71g, and the ring sleeve 71g is sleeved and fixed on the eccentric bearing 4g. The other end of the linkage plate 72g is fixed on the side screen body of the vibrating screen H.

[0230] like Fig.24 or Fig.25 As shown, the protective plate 9g is fixed on the support beam 12b close to the driving wheel 5g, and the plate surface of the protective plate 9g is extended along the radial direction of the transmission shaft 3g. In this embodiment, the protective plate 9g is straddled on the bearing seat 2g and is set with a gap between the bearing seat 2g. The area of ​​the protective plate 9g is larger than the cross-sectional area of ​​the driving wheel 5g, so as to fully block the crop straw and other debris screened from the tail of the vibrating screen H, and prevent the debris from entering the driving area on one side of the frame, causing entanglement or blockage, and affecting the normal operation of the machine.

[0231] For example Fig.24 or Fig.25 As shown, a counterweight 8g is detachably installed on the driving wheel 5g, and a counterweight 8g is also arranged at one end of the transmission shaft 3g away from the protective plate 9g. The counterweight block 8g is detachably fixed on the connecting block, and the connecting block is fixed on the transmission shaft 3g. The counterweight blocks at both ends of the transmission shaft 3g are asymmetrically arranged. When the transmission shaft 3g rotates and drives the vibrating screen H to reciprocate, the asymmetrically arranged counterweight 8g is used to avoid excessive reciprocating vibration of the vibrating screen H, thereby ensuring the balance of the overall vibration of the vibrating screen H.

[0232] like Fig.29 As shown, the air supply system includes a fan, an air supply channel, a tail cover 2j and a baffle 3j. An air supply channel is formed between the bottom shell at the lower part of the harvester and the threshing system at the upper part. The bottom shell includes a fan housing 3f, a grain bottom shell 5e, a waste bottom shell 6e and a vibrating screen frame 1h arranged in sequence. The threshing system includes a first roller 2a and a second roller 3a arranged horizontally at intervals. A tail cover 2j is installed at the tail end of the threshing system away from the fan, that is, the side of the second roller 3a close to the discharge port 5j. A discharge port 5j is formed between the tail cover 2j and the screen frame 1h. A baffle 3j is arranged between the tail cover 2j and the vibrating screen to guide the air supply toward the discharge port 5j.

[0233] In the vertical direction, the height of the discharge port 5j is higher than the height of the air outlet 33f. Fig.30As shown, the air outlet 33f is arranged obliquely upward, the fan housing 3f, the seed bottom shell 5e, the residual bottom shell 6e and the screen frame 1h are inclined from one side of the air outlet 33f toward the discharge port 5j and are gradually increased in height. The two ends of the fan housing 3f are respectively provided with a first air inlet 31f connected to the outside world, and a second air inlet 32f is provided along its circumference on the side wall opposite to the air outlet 33f in the middle of the fan housing 3f. The air is supplied through three air inlets evenly distributed on the fan housing 3f, so that the air volume in the fan is uniform and stable. The air outlet 33f is gradually increased in height toward the discharge port 5j to improve the flowability, and the baffle 3j is installed on the tail cover 2j to guide the air supply toward the discharge port 5j to prevent the return air from entering the threshing system and the screening system and affecting the cleanliness of the crop. The air supply system has a compact and stable structure, sufficient air volume, and no return air influence, which greatly improves the air selection efficiency.

[0234] like Fig.30 As shown, two air guides are arranged in the air outlet 33f at intervals in the vertical direction, and the air outlet 33f is spaced to form three air outlet branches. In this embodiment, the air guide is a plate-like structure, which is an upper air guide plate 41j located above and a lower air guide plate 42j located below. The two air guides are respectively mounted on the frame 1 in a flippable manner, and are suitable for flipping each other to change the air outlet direction and air outlet area of ​​the three air outlet branches. For example, the two ends of the two air guides are respectively fixed to two fixed points (not shown in the figure) of the frame 1 by two bolts, one of which is a waist-shaped hole with an arc, and the air guide can swing around the other fixed point. When it swings to a suitable position, the air guide is locked in the waist-shaped hole. It can also be that each fixed point corresponds to a strip hole, and the two fixed points are fixed at different positions to achieve the adjustment of the angle between the air guide and the horizontal plane. This type of flip adjustment is a conventional structure and will not be repeated here.

[0235] In this embodiment, Fig.29 As shown, the tail cover 2j is bent, and a rear sealing plate 1j is arranged between the tail cover 2j and the second roller 3a. The rear sealing plate 1j is arranged horizontally, and the tail cover 2j is hingedly arranged on the rear sealing plate 1j, suitable for flipping upward and opening. A cavity is formed between the tail cover 2j and the lower screen frame 1h, and the flow blocking member 3j is arranged in the cavity. Fig.31As shown, the flow blocking member 3j includes a threshing sealing plate 31j horizontally fixed on the side of the second roller 3a near the discharge port 5j, the threshing sealing plate 31j is arranged parallel to the upper rear sealing plate 1j, and a tail cover sealing plate 32j is arranged between the threshing sealing plate 31j and the end of the tail cover 2j. The lower surfaces of the threshing sealing plate 31j and the tail cover sealing plate 32j form a wind guide surface to prevent the wind blown out by the fan from entering the cavity between the tail cover 2j and the screen frame 1h after rising on the surface of the screen frame 1h, and rotating along the empty wall to enter the threshing system or screening system, affecting the cleanliness of the crop and the efficiency of the wind selection. In this embodiment, the tail cover sealing plate 32j is arranged in two sections of mutually hinged plate surfaces, and the tail cover sealing plate 32j is hingedly arranged with the threshing sealing plate 31j, so that when the tail cover 2j is opened upward, the tail cover sealing plate 32j can be driven to rotate upward at the same time, avoiding the need to remove the tail cover sealing plate 32j first when the tail cover 2j is flipped upward to open, resulting in cumbersome operation and affecting efficiency.

[0236] like Fig.32 and Fig.33 As shown, the fan includes a fan housing 3f, a fan structure and a fan drive.

[0237] The fan structure is installed in the cylindrical installation cavity of the fan housing 3f, and the first air inlet 31f communicating with the outside is respectively provided at both ends of the fan housing 3f in the axial direction. The first air inlet 31f is a circular air inlet, which is arranged concentrically with the cross section of the cylindrical installation cavity. An air outlet 33f is provided on the side wall of the fan housing 3f along its axial direction, and the width of the air outlet 33f is the same as the width of the installation cavity. An air guide structure can be installed on the air outlet 33f to guide the outlet air to blow in a set direction.

[0238] like Fig.32 As shown, a second air inlet 32f is provided on the side wall of the fan housing 3f opposite to the air outlet 33f along the circumference of the fan housing 3f. The projection of the second air inlet 32f on the horizontal plane is a square. In the axial direction of the fan housing 3f, the second air inlet 32f is located in the middle of the fan housing 3f. In this embodiment, the second air inlet 32f is located on the fan housing 3f obliquely above the air outlet 33f. The second air inlet 32f is provided in the middle of the housing, and cooperates with the first air inlets 31f at both ends of the fan housing 3f to form three air inlets evenly distributed on the fan housing 3f, providing sufficient air intake while making the air intake more uniform.

[0239] like Fig.33 As shown, each first air inlet 31f on both sides is provided with a wind shield. In this embodiment, the wind shield is a plate-shaped structure, and two wind shields are correspondingly provided on each first air inlet 31f. Fig.33As shown, the two windshield members are respectively a first windshield 51i arranged on the side close to the air outlet 33f and located at the upper half of the first air inlet 31f, and a second windshield 52i arranged on the side away from the air outlet 33f and located at the lower half of the first air inlet 31f. In this embodiment, a connecting port connected to the outside is provided on the shell of the frame 1 corresponding to the first air inlet 31f, and the size of the connecting port is the same as the size of the first air inlet 31f. Both ends of the fan shell 3f are against the shell of the frame 1, and the first air inlet 31f is directly opposite to the connecting port. Strip holes are provided on the first windshield 51i and the second windshield 52i respectively, and matching holes are provided on the corresponding fan shell 3f and the frame 1. The strip holes on the first windshield 51i are arranged horizontally to facilitate the first windshield 51i to slide horizontally and partially cover the upper half of the first air inlet 31f. The strip holes on the second wind shield 52i are arranged vertically to facilitate the second wind shield 52i to slide vertically and partially block the lower half of the first air inlet 31f. The wind shield can be used to adjust the air inlet area of ​​the first air inlet 31f and change the air intake volume under different working conditions, thereby making it more applicable.

[0240] like Fig.36 As shown, the fan structure includes a fan shaft 1i, a plurality of support units and a plurality of fan blades 2i. Fig.33 As shown, both ends of the fan shaft 1i extend out of the first air inlet 31f and are rotatably fixed in a bearing seat located on the frame 1. A driving pulley is installed at one end of the fan shaft 1i for connecting to a transmission shaft to provide a driving force for the fan structure to rotate. In this embodiment, the fan is driven by a belt drive.

[0241] like Fig.36 As shown, the support units are evenly spaced and fixed on the fan shaft 1i, and the fan blades 2i are fixed on the support units. Fig.34 As shown, each support unit includes a plurality of blade brackets 3i, which are bolted and fixed in sequence along the circumference of the fan shaft 1i and locked on the fan shaft 1i, and the blades 2i are bolted and fixed on the blade brackets 3i respectively.

[0242] In this embodiment, the fan blade bracket 3i is a plate-like structure, and the fan blade bracket 3i is bent to form a fixed section 32i and a mounting section 31i. In the same support unit, the fixed section 32i of one fan blade bracket 3i is bolted and fixed to the mounting section 31i of another fan blade bracket 3i. Multiple fan blade brackets 3i are connected end to end in sequence to form a polygon in the circumferential direction of the fan shaft 1i, and the polygon is circumscribed to the circle of the cross section of the fan shaft 1i. Multiple fan blade brackets 3i are fixed around the fan shaft 1i by bolting, and the structure is simple and stable, and the parts are easy to disassemble and replace.

[0243] All the fan blade brackets 3i in any support unit form a regular polygon, and the angle α formed between the fixed section 32i and the mounting section 31i is complementary to the inner angle β of the regular polygon. Fig.34 or Fig.36 As shown, in this embodiment, four fan blade brackets 3i are arranged in any supporting unit, and the fixed section 32i and the installation section 31i in each fan blade bracket 3i are arranged at right angles, together forming a square with a cross-sectional circle circumscribed to the fan shaft 1i.

[0244] In this embodiment, Fig.35 As shown, a flat groove 11i is provided on the fan shaft 1i corresponding to any support unit, and a reinforcing plate 4i is welded inside the flat groove 11i. The thickness of the reinforcing plate 4i is the same as the groove depth of the flat groove 11i, that is, the upper surface of the reinforcing plate 4i is tangent to the circle of the cross section of the fan shaft 1i, and at the same time, the width of the reinforcing plate 4i along the radial direction of the fan shaft 1i is not greater than the diameter of the fan shaft 1i, that is, it is avoided to be greater than the side length of the square surrounded by the fan blade bracket 3i, resulting in failure to assemble. In this embodiment, the width of the reinforcing plate 4i is the same as the width of the flat groove 11i. The positioning of the flat groove 11i further avoids relative sliding between the fan blade bracket 3i and the fan shaft 1i due to the small clamping force of the fan blade bracket 3i fixed on the fan shaft 1i.

[0245] like Fig.36 As shown, in this embodiment, four support units are arranged on the fan shaft 1i in sequence, and four fan blades 2i are arranged on the two support units on the left side. The fan blades 2i are sheet-like structures, and each fan blade 2i spans two support units and is bolted and fixed on the mounting sections 31i of two fan blade brackets 3i. The fan blades 2i on the two support units on the right side are arranged in the same way as on the left side, and the specific structure is not repeated here. The fan blades 2i on the left and right sides form two sets of fan structures in parallel, and more air inlet channels can be provided between the two sets of fan structures, so that the fan air supply area is large and the air supply is uniform.

[0246] As an alternative implementation of Example 1, a plurality of flat grooves 11i can be opened on the fan shaft 1i, and the flat grooves 11i are arranged one-to-one corresponding to the fan blade brackets 3i. The fan blade brackets 3i are directly embedded in the flat grooves 11i, and are bolted end to end in sequence and locked on the fan shaft 1i.

[0247] like Fig.37 As shown, the cleaning transmission system includes an output pulley 1s connected to the engine, and the output pulley 1s is divided into three transmission outputs, and the three transmissions are distributed on the same side wall of the frame 1.

[0248] In this embodiment, the intermediate transmission shaft 10s is rotatably arranged in two bearing seats at the front end of the frame 1, one end of which is fixed with an input pulley 11s, which is connected to the engine (not shown) on the frame 1 through a main clutch belt, and the other end is fixed with an output pulley 1s, which is used for connecting other power mechanisms of the harvester, including a threshing mechanism, a shredding mechanism, a winnowing mechanism, a grain storage mechanism, a miscellaneous re-throwing mechanism, and a screening mechanism. The output pulley 1s is a multi-groove pulley, which can be composed of a plurality of multi-groove pulleys and fixed at one end of the intermediate transmission shaft 10s at the same time, and is suitable for rotating with the intermediate transmission shaft 10s. In this embodiment, the output pulley 1s and the pulleys in other power mechanisms are connected by a V-belt transmission. Of course, a chain can also be used, but the stability of the chain transmission is not as good as that of the V-belt. Secondly, when the threshing drum is blocked, causing the drum cover and other parts to be broken and damaged, the chain may not be broken and continue to transmit power, which is easy to cause damage to the parts. When the V-belt is used for transmission, the V-belt may slip or burn when the above situation occurs, affecting normal operation. In order to promptly remind the user to stop the machine for cleaning, repair and replacement, it will not cause damage to other components. Therefore, V-belt transmission is preferably used.

[0249] like Fig.37 As shown, the first transmission includes an output pulley 1s, a first threshing pulley 2s and a second threshing pulley 3s. The output pulley 1s and the first threshing pulley 2s are connected by three C-shaped V-belts to increase the overall cross-section of the V-belt and improve the transmission power. The first threshing pulley 2s and the second threshing pulley 3s are connected by a 2HB belt combination. The combination belt can fit well with the pulley, the force is evenly applied, and the transmission stability and impact resistance are good to adapt to the high-intensity working environment of the threshing drum.

[0250] The second transmission includes an output pulley 1s and a chopper pulley 4s. The chopper is generally arranged at the rear end of the frame 1, and the span between the output pulley 1s is relatively large. Therefore, a first transition wheel 71s is fixed on the frame 1 between the output pulley 1s and the chopper pulley 4s, and the transmission is divided into two stages. The first transition wheel 71s is rotatably arranged on the frame 1 through a mounting frame, and is located on the line connecting the output pulley 1s and the chopper pulley 4s. The first transition wheel 71s adopts a multi-groove pulley. The output pulley 1s is connected to the first transition wheel 71s by transmission, and the first transition wheel 71s is connected to the chopper pulley 4s by transmission.

[0251] The third transmission includes an output pulley 1s, a fan pulley 51s, a seed pulley 52s, a miscellaneous pulley 53s and a screening pulley 6s. There are many transmission components and a large transmission span in the third transmission. Therefore, a second transition pulley 72s is set in the third transmission, which is also divided into two-stage transmission. The first stage transmission is a transmission connection between the output pulley 1s, the fan pulley 51s, the seed pulley 52s, the second transition pulley 72s and the miscellaneous pulley 53s; the second stage transmission is a transmission connection between the second transition pulley 72s and the screening pulley 6s. In order to ensure that the rotation directions of the screening pulley 6s and the output pulley 1s are opposite, the second transition pulley 72s adopts a multi-groove pulley. In the first stage transmission, the outer side surface of the V-belt contacts the wheel groove surface of the second transition pulley 72s, so that the rotation direction of the second transition pulley 72s is opposite to that of the output pulley, so that the screening pulley 6s connected to the second transition pulley 72s is opposite to the rotation direction of the output pulley 1s.

[0252] In this embodiment, a tensioning assembly is installed between adjacent pulleys, such as Fig.38 As shown, any tensioning assembly includes a tensioning arm 81s, a tensioning wheel 82s, a pull rod 83s and a tension spring 84s. In this embodiment, the tensioning arm 81s is a triangular structure, one of the corners of the triangle is hingedly mounted on the frame 1, and the other two corners are free ends, one of which is rotatably mounted with the tensioning wheel 82s, and a tensioning spring 84s is arranged between the other free end and the pull rod 83s, the pull rod 83s is fixed on the frame 1, and the tensioning wheel 82s is located between the hinge point of the tensioning arm 81s on the frame 1 and the fixed point of the pull rod 83s on the frame 1, so that under normal conditions, the tensioning wheel 82s is tensioned and pressed against the V-belt by the biasing force of the tension spring 84s.

[0253] like Fig.39 As shown, in this embodiment, the grain auger 521s is horizontally arranged at the bottom of the frame 1, one end of which is fixed with the grain pulley 52s, and the other end is connected to the granary auger 522s through the reversing gear box 9s. The granary auger 522s is a lifting auger in the vertical direction, suitable for lifting the grains transported by the lower grain auger 521s upward and entering the granary from the upper entrance of the granary. The waste auger 531s is horizontally arranged at the bottom of the frame 1, one end of which is fixed with the waste pulley 53s, and the other end is connected to the re-threating auger 532s through the reversing gear box 9s. The re-threating auger 532s is a lifting auger inclined in the vertical direction, suitable for lifting the waste of the grains transported by the lower waste auger 531s upward to the threshing drum for re-threshing to avoid grain waste. The power for grain entry and re-threshing is provided by the output pulley 1s, and the structure is simple and compact.

[0254] The power inputs of the threshing mechanism, chopping mechanism, winnowing mechanism, grain bin feeding mechanism, residue re-threshing mechanism, and screening mechanism of the harvester are all arranged on the same side of the frame 1, making the transmission system structure of the whole machine compact. All drive pulleys are arranged on the same side, which is convenient for installation, control, and debugging. Moreover, the power input of each mechanism is directly provided by the output pulley 1s, avoiding transmission losses caused by intermediate transmission, reducing the working load of the mechanism providing intermediate transmission, and improving the transmission efficiency and service life of the whole machine.

[0255] As Fig.40 and Fig.47 shown, the chopper assembly includes a straw discharge channel and a straw inlet (not shown in the figure) and a straw outlet 10p at both ends of the straw discharge channel. Both ends of the moving knife roller 1r are rotatably fixed to the left side wall 10r and the right side wall 11r of the straw discharge channel. For the convenience of clearly showing other structures, the left side wall 10r and the right side wall 11r are only partially shown in Fig.40 . The moving knife roller 1r is a cylindrical roller. A plurality of moving knife blades 2r are arranged in a spiral distribution and are detachably installed on the moving knife roller 1r. Any moving knife blade 2r is parallel to the cross-section of the moving knife roller 1r.

[0256] As Fig.42 shown, a plurality of moving knife seats 5r are welded and fixed on the moving knife roller 1r, and the moving knife blades 2r are correspondingly and fixedly installed in the moving knife seats 5r. Each moving knife seat 5r has a U-shaped structure. In this embodiment, the moving knife blade 2r is bolted and fixed in the U-shaped installation cavity of the moving knife seat 5r.

[0257] As Fig.43 shown, in the square structure after unfolding the moving knife roller 1r along one of its cylindrical generatrices and laying it flat, in the length direction, a plurality of moving knife seats 5r are arranged in rows and inclined, as Fig.43 shown, six moving knife seats 5r form a row, and are arranged at intervals and inclined from the upper left first moving knife seat 5r to the lower right in sequence. In the width direction, the moving knife seats 5r are arranged in multiple rows. As Fig.43 shown, in this embodiment, the moving knife seats 5r form four rows from top to bottom, and the four rows of moving knife seats 5r are inclined in the same direction. And the moving knife seats 5r in adjacent rows are arranged at intervals in the length direction, that is, the first row of moving knife seats 5r and the second row of moving knife seats 5r are staggered, and the first row of moving knife seats 5r and the third row of moving knife seats 5r are in the same position, forming a row-by-row intersection. The distribution state on the moving knife roller 1r is as Fig.44 shown, so that the orthographic projections of all moving knife seats 5r on the plane where the cross-section of the moving knife roller 1r is located form a closed ring. As Fig.45 shown, after the moving knife blades 2r are installed in all the moving knife seats 5r, the moving knife blades 2r can also form a closed ring on the plane where the cross-section of the moving knife roller 1r is located.

[0258] The fixed knife seat 3r is arranged diagonally below the moving knife roller 1r. As Fig.41 As shown, a plurality of fixed blades 4r are arranged on the fixed blade seat 3r in the same direction and at even intervals, and a row of movable blades 2r is passed between two adjacent fixed blades 4r. Fig.43 In the figure, the first row of movable blades 2r are the movable blades 2r on the first movable blade holder 5r from the left in the first and third rows, the second row of movable blades 2r are the movable blades 2r on the first movable blade holder 5r from the left in the second and fourth rows, and so on.

[0259] When the moving blade roller 1r is driven to rotate, the moving blade 2r is driven by the moving blade roller 1r to rotate and pass through the gaps between the fixed blades 4r. The moving blades 2r are arranged and distributed in a spiral shape on the roller surface of the moving blade roller 1r. When the moving blade roller 1r is in any rotation position, it can be ensured that the moving blade 2r can pass through the gaps between the fixed blades 4r, that is, the cutting state between the moving blade 2r and the fixed blade 4r can be always maintained. At the normal rotation speed of the moving blade roller 1r, the shredding efficiency is still improved, the power output cost caused by increasing the rotation speed is reduced, and the safety hazard caused by the destruction of the dynamic balance due to the increase in the rotation speed is avoided.

[0260] like Fig.46 As shown, the anti-entanglement ring K is sleeved on the bearing seats at both ends of the moving knife roller 1r and fixed on the left wall 10r and the right wall 11r. Fig.46 As shown, each anti-entanglement ring K includes at least two ring plates 1k and at least two clamping plates 2k. The ring plates 1k are respectively in an arc-shaped structure, and all the ring plates 1k are connected end to end to form a circular isolation area. At least two clamping plates 2k are fixed on one of the two connected ring plates 1k, and a slot 3k is formed between the ring plate 1k; the other ring plate 1k is suitable for being inserted and fixed in the slot 3k.

[0261] In this embodiment, Fig.46 As shown, any ring plate 1k includes a bottom plate 11k and a side plate 12k. The bottom plate 11k is a flat plate bent in an arc shape, and the side plate 12k is a curved plate arranged along the outer ring edge of the bottom plate 11k. In this embodiment, the bottom plate 11k and the side plate 12k are integrally formed.

[0262] In this embodiment, two ring plates 1k are provided, and both ring plates 1k are semicircular, and the outer wall surface of one ring plate 1k is attached to the inner wall surface of the other ring plate 1k, and holes are punched on the two superimposed bottom plates 11k, and the two ring plates 1k are fixedly connected by bolts. A plurality of assembly holes 5k are also provided on the bottom plate 11k, and the assembly holes 5k match the size of conventional bolts. The bolts pass through the assembly holes 5k to install and fix the anti-entanglement ring on the left side wall 10r and the right side wall 11r. Of course, the ring plates 1k can also be three or four, etc., which are connected end to end in sequence to form a circular isolation area. The specific number of the ring plates 1k depends on the specific situation.

[0263] In this embodiment, the side plate 12k of any ring plate 1k is arranged perpendicular to the bottom plate 11k, the card plate 2k is bent in an L shape, the short side of the L shape is welded and fixed to the outer wall surface of one side plate 12k, and is located at both ends of the side plate 12k, the long side of the L shape is arranged parallel to the side plate 12k, and a slot 3k is formed between the card plate 2k and the side plate 12k, and the two ends of the other side plate 12k are correspondingly inserted into the slot 3k.

[0264] For example Fig.46 As shown, at least one obstacle clearing opening is provided on the bottom plate 11k for observation or to extend other equipment therefrom. In this embodiment, the obstacle clearing opening is an obstacle clearing groove 4k formed by the inner edge of the arc-shaped bottom plate 11k being recessed toward the outer edge of the arc-shaped bottom plate 11k. The obstacle clearing groove 4k is an isosceles trapezoid as a whole, and the width of the notch is greater than the width of the bottom of the groove. The notch is located on the inner ring of the bottom plate 11k. The hole formed by the bottom plate 11k of the anti-entanglement ring is used to be fixed on the bearing seat. Therefore, the notch is buckled on the surface of the bearing seat. The notch size is large, which is more convenient for observing the internal situation. In this embodiment, two obstacle clearing grooves 4k are provided on the bottom plate 11k of each ring plate 1k, and the four obstacle clearing grooves 4k are evenly spaced on the circumference.

[0265] The annular isolation area is formed by the ring plate 1k, which is suitable for being sleeved and fixed on the driving shaft and blocked in the gap to prevent weeds or straw from being entangled on the driving shaft.

[0266] like Fig.47 and Fig.48 As shown, the spreading structure includes a grass spreading plate 1p, a plurality of first grass guide plates 2p and a plurality of second grass guide plates 3p. Fig.48 As shown, an extension section 11p is provided on the grass separating board 1p, and the width of the extension section 11p is the same as the width of the grass discharge port 10p. The edge of the extension section 11p is provided with a flange, and is fixed to the upper edge of the grass discharge port 10p through the flange. The grass separating board 1p is provided with an overall downward tilt.

[0267] The surface of the grass dividing plate 1p is gradually enlarged from its extension section 11p to the end away from the grass discharge port 10p, and a plurality of first grass guide plates 2p are spaced apart on the lower surface of the grass dividing plate 1p in a direction parallel to the edge of the grass discharge port 10p and close to one end of the grass discharge port 10p. The first grass guide plate 2p is perpendicular to the grass dividing plate 1p and is set at an angle to the center line of the grass dividing plate 1p. In the present embodiment, three first grass guide plates 2p are provided, which are arranged on the grass dividing plate 1p at different angles, and are suitable for guiding the broken straw in different directions. Four, five, etc. first grass guide plates 2p can also be provided, depending on specific needs. The first grass guide plates 2p are symmetrically arranged about the center line of the grass dividing plate 1p.

[0268] like Fig.48As shown, a plurality of second grass guide plates 3p are arranged on the grass dividing plate 1p at one end away from the grass discharge port 10p, and the second grass guide plates 3p are arranged at intervals on the lower surface of the grass dividing plate 1p in a direction parallel to the edge of the grass discharge port 10p. Similarly, the second grass guide plates 3p are perpendicular to the grass dividing plate 1p and are arranged at an angle with the center line of the grass dividing plate 1p. In this embodiment, the number of the second grass guide plates 3p is greater than the number of the first grass guide plates 2p. For example, seven second grass guide plates 3p are arranged, and the seven second grass guide plates 3p are evenly spaced and symmetrically arranged about the center line of the grass dividing plate 1p. The angle between the second grass guide plate 3p and the center line of the grass dividing plate 1p is gradually increased from the second grass guide plate 3p close to the center line of the grass dividing plate 1p to the second grass guide plate 3p away from the center line of the grass dividing plate 1p. In this embodiment, except for the second grass guide plate 3p located on the center line of the grass dividing plate 1p, the other second grass guide plates 3p are curved plates, so that all the second grass guide plates 3p are fan-shaped as a whole. The first grass guide plate 2p and the second grass guide plate 3p form a trapezoidal structure, and the crushed straw coming out of the grass discharge port 10p is first guided and dispersed by the first grass guide plate 2p, and then spread over a large range and at multiple angles by the second grass guide plate 3p, so that the straw cut and crushed by the movable blade 2r and the fixed blade 4r is evenly spread in the field, avoiding straight-line accumulation in the field, thereby improving the spreading efficiency.

[0269] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A combine harvester, characterized in that: include: A frame (1) and a vehicle frame (2), wherein a walking mechanism (3) is arranged below the chassis of the vehicle frame (2); a power assembly, a harvesting assembly, a cab (7), a threshing and cleaning system, a cleaning transmission system and a grain storage assembly are arranged above the chassis of the vehicle frame (2); The harvesting assembly comprises a header (41) and a crop conveying structure (42); the cab (7) and the crop conveying structure are arranged in parallel at the front of the vehicle frame (2); The threshing and cleaning system comprises a double-screw threshing and conveying system having a "J"-shaped threshing direction; the threshing and cleaning system and the grain storage component are arranged in parallel at the rear of the frame (1); the crop conveying structure (42) is connected to the feeding port of the threshing and cleaning system; the feeding port is arranged at the front end of the threshing and cleaning system and close to the grain storage component; the spreading structure in the threshing and cleaning system is arranged at the rear end of the threshing and cleaning system and close to the grain storage component; The power assembly comprises an engine (51) and a gearbox (52); the engine (51) is fixed on the chassis of the vehicle frame (2) between the cab (7) and the grain storage assembly; the engine (51) is suitable for driving the cleaning transmission system; the cleaning transmission system is arranged on the threshing and cleaning system and is located on the side facing away from the grain storage assembly; The double-helix threshing and conveying system comprises: Two concave plate screens are arranged on the frame (1) in parallel and at intervals in the horizontal direction; the inner screen surface of any of the concave plate screens is in an arc shape; a transition opening (6b) is radially provided at one end of the two concave plate screens located on the same side of the frame (1); the two transition openings (6b) are opposite to each other and are connected to each other; A transition plate screen (7b), laid between the two concave plate screens and connecting the two transition ports (6b); A crop feeding port (21b) is provided on the concave plate screen at the other end thereof, which is opposite to the transition port (6b) and away from the transition port (6b); Two barrel covers are corresponding to each other and buckled on the concave plate screen, and a hollow cylindrical installation cavity is formed between the barrel covers and the concave plate screen; a plurality of guide members are arranged at intervals on the wall surface of any barrel cover facing the installation cavity, and are suitable for guiding the crops entering the installation cavity to move in a directional manner around the axis; the guiding directions of the guide members in the two barrel covers are opposite; Two rollers are coaxially and rotatably arranged in the installation cavity; gaps are provided between the rollers and the corresponding inner screen surface and the end surface of the guide member; the working area of ​​the roller is the same as the length of the corresponding concave screen; the two concave screens are the same in length; It also includes a limit adjustment structure, which is detachably arranged at the gap (10b) formed between the outer screen surfaces of the two concave plate screens and the transition plate screen (7b); The position limiting adjustment structure comprises a sealing plate (9b), the shape of which matches the shape of the notch (10b); the position limiting adjustment structure also comprises: The two adjusting members are in an arc shape as a whole and are respectively fixed on the two concave screens on both sides of the notch (10b); the two sides of the sealing plate (9b) are respectively fixed on the two adjusting members; Any of the adjusting members comprises: The adjusting plate (91b) has a plate surface in an arc shape matching the concave plate screen to which it is fixed; the plate surface of the adjusting plate (91b) is adapted to partially block the transition port (6b); Two mounting plates (92b) are bent along the adjusting plate (91b) and are respectively fixed on opposite sides of the adjusting plate (91b); one of the mounting plates (92b) is adapted to be fixed on the concave plate screen, and the other mounting plate (92b) is adapted to be fixedly connected to the sealing plate (9b).

2. The combine harvester according to claim 1, characterized in that: The cross-section of the adjusting member is in a U shape.

3. The combine harvester according to claim 1, characterized in that: The screen surface of the transition plate screen (7b) is tangent to the inner screen surface of the concave plate screen that first contacts the crop.

4. The combine harvester according to claim 1, characterized in that: The cylinder cover includes a square mounting frame (22c) and an arc-shaped cover body (21c) hinged to one side frame edge of the mounting frame (22c); the mounting frame (22c) is adapted to be lapped and fixed on the edge of the concave plate screen; The cover body (21c) includes an arc-shaped top cover (211c) and side top plates (212c)封堵 on both sides of the top cover (211c); the guiding members are arranged at intervals along the inner wall surface of the top cover (211c), and a guiding channel is formed between adjacent guiding members.

5. The combine harvester according to claim 1, characterized in that: A plurality of拨动件 are arranged at intervals along the axial direction of any one of the drums; all the拨动件 have the same size; the distance from the end face of any one of the拨动件 to the axis of the drum forms the rotation radius of the drum; The height of the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop later from the horizontal plane is greater than the height of the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop first from the horizontal plane.

6. The combine harvester according to claim 1, characterized in that: The threshing and cleaning system further includes a screening system; the screening system includes: A vibrating screen (H) having an upper screen area and a lower screen area; the screen frame (1h) of the vibrating screen (H) is integrally in a funnel-shaped structure; In the upper screen area, a corrugated plate (6d), a lifting structure, at least one section of a scale screen (7d), and a tail screen (2h) are arranged in sequence along the crop moving direction; A lower screen (8d) is arranged in the lower screen area corresponding to the scale screen (7d); A front sealing structure is hermetically fixed at the front end of the corrugated plate (6d); A grain separation structure is arranged at the end of the lower screen (8d) and straddles between the grain collection area (M) and the residue collection area (N); A driving structure is fixed on the frame (1) and is adapted to drive the vibrating screen (H) to vibrate reciprocally.

7. The combine harvester according to claim 6, characterized in that: The lifting structure is a vibrating screen; the vibrating screen includes: A mounting member having an assembly surface (12d) and a mounting surface (11d) on the side opposite to the assembly surface (12d) and arranged at an acute angle to the assembly surface (12d); the assembly surface (12d) is fixed at the tail end of the corrugated plate (6d); A plurality of screen teeth (2d) extend along the opening direction of the angle formed by the assembly surface (12d) and the mounting surface (11d), and one end is a fixed end and is spaced and fixed on the mounting surface (11d), and the other end is a free end and is suspended.

8. The combine harvester according to claim 7, characterized in that: Any one of the screen teeth (2d) is bent in a stepped shape; it is adapted to guide the crop to travel along the screen teeth (2d) from the fixed end located on the mounting surface (11d) to the free end.

9. The combine harvester according to claim 6, characterized in that: The front sealing structure includes: It should be noted that there are some terms like "拨动件" in the original text which may be incorrect or unclear terms. You may need to check and correct them according to the actual situation. A sealing member is fixed between a front material plate (2f) at the front end of the corrugated plate (6d) and a fan housing (3f) located below the front material plate (2f); the width of the sealing member is not less than the screen surface width of the vibrating screen (H) between the front material plate (2f) and the fan housing (3f); Two opposite sides of the sealing member in the width direction correspond to the left and right side walls of the frame (1) and are arranged with a gap therebetween.

10. The combine harvester according to claim 9, characterized in that: The front sealing structure also includes: The first shielding member (6f) is arranged between the front material plate (2f) and the screen front plate (5f) of the vibrating screen (H); the first shielding member (6f) is a flexible member having an extension margin for the reciprocating vibration of the vibrating screen (H).

11. The combine harvester according to claim 10, characterized in that: The front sealing structure also includes: A second shielding member (7f) has one end fixed to one end of the front material plate (2f) facing the vibrating screen (H), and the other end is a free end and naturally hangs down to the screen surface of the vibrating screen (H).

12. The combine harvester according to claim 6, characterized in that: The seed separation structure comprises: An isolation member is arranged between the seed collection area (M) and the debris collection area (N), and is fixed on the screen frame (1h); an isolation surface of the isolation member extends from one side of the seed collection area (M) to above the debris collection area (N); A front curtain (3e) extends in the same direction as the isolation surface, with one end fixed on the isolation member and the other end mounted on the seed bottom shell (5e) in the seed collection area (M); and is suitable for covering an opening formed between the isolation member and the seed bottom shell (5e) and connecting the seed collection area (M) and the debris collection area (N).

13. The combine harvester according to claim 12, characterized in that: The seed separation structure further comprises: A rear curtain (4e) is arranged at an angle with the isolation surface, with one end fixed on the isolation member and the other end mounted on the debris bottom shell (6e) in the debris collection area (N); and is suitable for covering the opening formed between the isolation member and the debris bottom shell (6e) and connecting the debris collection area (N) and the grain collection area (M).

14. The combine harvester according to claim 6, characterized in that: The driving structure comprises: Two bearing seats (2g) are respectively fixed on the side walls of two symmetrical and vertically arranged support beams (12b) at the rear end of the frame (1); an outer spherical bearing is installed in any of the bearing seats (2g); A transmission shaft (3g), both ends of which are respectively fixed in the outer spherical bearing; Two eccentric bearings (4g) are fixed at both ends of the transmission shaft (3g) in a mirror-image manner; One end of the screen frame (1h) is fixed on the two eccentric bearings (4g), and the other end is arranged on the frame (1) through a reciprocating guide structure; The driving wheel (5g) is fixed to one end of the transmission shaft (3g) and is suitable for being driven by a drive of the harvester and driving the transmission shaft (3g) to rotate.

15. The combine harvester according to claim 14, characterized in that: The reciprocating guide structure comprises: Two track bearings (61g) are symmetrically arranged on both sides of the screen frame (1h) and away from one end of the transmission shaft (3g); Two vibration rails (62g) are symmetrically arranged on the frame (1) on both sides of the screen frame (1h); the guiding direction of the vibration rail (62g) is arranged at an angle with the horizontal plane; the rail bearings (61g) are slidably arranged in the vibration rails (62g) in one-to-one correspondence.

16. The combine harvester according to claim 1, characterized in that: The threshing and cleaning system also includes an air supply system; the air supply system includes: A fan having an air outlet (33f); An air supply channel is formed between the bottom shell at the lower part of the harvester and the threshing system at the upper part; The bottom shell comprises a fan housing (3f), a grain bottom shell (5e), ​​a waste bottom shell (6e) and a vibrating screen frame (1h) which are arranged in sequence; A tail cover (2j) is installed at the tail end of the threshing system away from the fan; a discharge port (5j) is formed between the tail cover (2j) and the screen frame (1h); a baffle (3j) is arranged between the tail cover (2j) and the vibrating screen to guide the air supply toward the discharge port (5j); In the vertical direction, the height of the discharge port (5j) is higher than the height of the air outlet (33f); the air outlet (33f) is arranged to be inclined toward the discharge port (5j); the fan housing (3f), the seed bottom shell (5e), ​​the waste bottom shell (6e) and the screen frame (1h) are arranged to be inclined from one side of the air outlet (33f) toward the discharge port (5j) and gradually increase in height; The fan housing (3f) has a cylindrical installation cavity; The two ends of the fan housing (3f) in the axial direction are respectively provided with first air inlets (31f) communicating with the outside world; A second air inlet (32f) is provided on the side wall of the fan housing (3f) opposite to the air outlet (33f) along its circumferential direction; in the axial direction of the fan housing (3f), the second air inlet (32f) is located in the middle of the fan housing (3f).

17. The combine harvester according to claim 1, characterized in that: The cleaning transmission system comprises: An output pulley (1s) connected to the engine transmission; the output pulley (1s) is divided into three transmission outputs; the three transmission outputs are distributed on the same side wall of the frame (1); The first transmission path comprises an output pulley (1s), a first threshing pulley (2s) and a second threshing pulley (3s); The second transmission includes an output pulley (1s) and a chopper pulley (4s); The third transmission path includes an output pulley (1s), a fan pulley (51s), a seed pulley (52s), a miscellaneous pulley (53s) and a screening pulley (6s); all the pulleys are connected in a transmission manner.

18. The combine harvester according to claim 17, characterized in that: Also includes: A first transition wheel (71s) is fixed on the frame (1) and is arranged between the output pulley (1s) and the chopper pulley (4s); the output pulley (1s) is transmission-connected to the first transition wheel (71s); and the first transition wheel (71s) is transmission-connected to the chopper pulley (4s).

19. The combine harvester according to claim 17, characterized in that: Also includes: The second transition wheel (72s) is fixed on the frame (1) and is arranged in the third transmission; the output pulley (1s), the fan pulley (51s), the grain pulley (52s), the second transition wheel (72s) and the miscellaneous pulley (53s) are transmission-connected to each other; the second transition wheel (72s) is transmission-connected to the screening pulley (6s).

20. The combine harvester according to claim 17, characterized in that: The three-way transmission all adopts V-belt transmission connection.

21. The combine harvester according to claim 20, characterized in that The first threshing belt wheel (2s) and the second threshing belt wheel (3s) are connected via a combined belt transmission.

22. The combine harvester according to claim 20, characterized in that: It also includes a plurality of tensioning assemblies distributed between adjacent pulleys and suitable for tensioning the V-belts between adjacent pulleys.

23. The combine harvester according to claim 22, characterized in that Any of the tensioning assemblies comprises: A tensioning arm (81s), one end of which is hingedly arranged on the frame (1) and the other end of which is a free end; A tensioning wheel (82s) fixed to the free end of the tensioning arm (81s); A pull rod (83s) fixed on the frame (1); A tension spring (84s) is arranged between the pull rod (83s) and the tension arm (81s); The tension wheel (82s) is tensioned against the V-belt by the biasing force of the tension spring (84s).

24. The combine harvester according to claim 17, characterized in that: The grain auger (521s) is installed on the frame (1), with one end fixing the grain pulley (52s) and the other end connected to the granary auger (522s); a direction-changing gear box (9s) is arranged between the grain auger (521s) and the granary auger (522s).

25. The combine harvester according to claim 17, characterized in that: The redundant auger (531s) is passed through the frame (1), and a redundant pulley (53s) is fixed at one end, and the other end is connected to the re-detaching auger (532s); a direction-changing gear box (9s) is arranged between the redundant auger (531s) and the re-detaching auger (532s).

26. The combine harvester according to claim 1, characterized in that The distribution structure includes: A grass dividing plate (1p) is fixed on the upper edge of the grass discharge port (10p); The board surface of the grass separation board (1p) is gradually expanded from the grass discharge port (10p) toward an end away from the grass discharge port (10p); A plurality of first grass guide plates (2p) are arranged at intervals on the lower surface of the grass separating plate (1p) in a direction parallel to the edge of the grass discharge port (10p); the first grass guide plates (2p) are perpendicular to the grass separating plate (1p) and are arranged at an angle to the center line of the grass separating plate (1p).

27. The combine harvester according to claim 26, characterized in that The first grass guide plate (2p) is arranged at one end close to the grass discharge port (10p); and further comprises: A plurality of second grass guide plates (3p) are arranged at intervals on the lower surface of the grass separation plate (1p) in a direction parallel to the edge of the grass discharge port (10p) and are located at an end away from the grass discharge port (10p); the second grass guide plates (3p) are perpendicular to the grass separation plate (1p) and are arranged at an angle to the center line of the grass separation plate (1p); The number of the second grass guide plates (3p) is greater than the number of the first grass guide plates (2p).

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