Combine harvester

Abstract

The present application provides a combine harvester, wherein a crop feeding opening is arranged in the middle of a vehicle frame (2), such that a connecting opening between a crop conveying structure (42) communicated with the crop feeding opening and a cutting table (41) is arranged in the position adjacent to the middle of the cutting table (41), and the crops fed into the connecting opening on both sides of the cutting table (41) are more uniform; at the same time, a distributing structure is set to be adjacent to a grain storage assembly, and a “ji”-shaped threshing trend of a double screw threshing and conveying system is used, such that crops enter from the middle of the front end of the harvester and are distributed from the middle of the tail end to ensure stability of center of gravity of the combine harvester. The cleaning transmission system is arranged on the outer side of a threshing system, and the transmission is centralized, thereby facilitating mounting and debugging. The whole machine has a compact structure, takes up little space, keeps the center of gravity stable during the operation of idle machine and harvesting operation, and has high maneuverability and remarkable operation efficiency.

Description

A combine harvester Technical Field

[0001] The present application 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 inside the drum. However, if the length is too long, the entire machine will inevitably be longer, 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] Horizontal-flow drum systems primarily include single-drum and 1.5-drum threshing systems. While their overall length is shorter than that of longitudinal-flow systems, their shorter drum stroke means the threshing stroke is less than half that of longitudinal-flow systems. For difficult-to-thresh crops, such short drums don't allow sufficient time for threshing within the drum. As a result, some of the fed crop is ejected from the machine before threshing, leading to increased crop losses. Consequently, existing mainstream combine harvesters struggle to achieve both high maneuverability and high harvesting efficiency.

[0005] Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present application is to overcome the problem that the combine harvester in the prior art cannot achieve high maneuverability and high operating efficiency at the same time.

[0007] To this end, the present application proposes a combine harvester, comprising: a frame, a traveling mechanism disposed below a 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 disposed above the chassis of the frame;

[0008] 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;

[0009] The threshing and cleaning system includes a double-helix threshing and conveying system with an X-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;

[0010] 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.

[0011] The double-helix threshing and conveying system comprises:

[0012] Two concave plate screens are arranged horizontally parallel and spaced apart on the frame; the inner screen surface of each concave plate screen is arc-shaped; a transition port is 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 and connected to each other;

[0013] A transition plate screen is laid between the two concave plate screens and connects the two transition ports;

[0014] A crop feeding port is provided on the concave plate screen at the other end thereof, which is opposite to the transition port and away from the transition port;

[0015] Two cylinder covers are corresponding to each other and buckled onto the concave plate screen, forming a hollow cylindrical installation cavity between the cylinder covers and the concave plate screen; a plurality of guide members are provided at intervals on the wall surface of each cylinder 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 cylinder covers are opposite;

[0016] Two rollers are coaxially and rotatably arranged in the installation cavity; gaps are set 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 length.

[0017] 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.

[0018] The limit adjustment structure also includes:

[0019] 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.

[0020] Any of the adjusting members includes:

[0021] An adjusting plate, the plate surface of which is in an arc shape matching the concave plate screen to which it is fixed; the plate surface of the adjusting plate is suitable for partially blocking the transition port;

[0022] Two mounting plates are bent along the adjusting plate and respectively fixed on opposite sides of the adjusting plate; one of the mounting plates is adapted to be fixed on the concave sieve, and the other mounting plate is adapted to be fixedly connected to the sealing plate.

[0023] The cross-section of the adjusting member is in a U shape.

[0024] The screen surface of the transition plate screen is tangentially arranged with the inner screen surface of the concave sieve that first contacts the crop.

[0025] The cylinder cover includes a square mounting frame and an arc-shaped cover body hinged to one side frame of the mounting frame; the mounting frame is adapted to be lapped and fixed on the edge of the concave sieve;

[0026] 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.

[0027] 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;

[0028] The height of the lowest point of the cylindrical surface formed by the rotation of the drum that later contacts the crop 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 first contacts the crop from the horizontal plane.

[0029] The threshing and cleaning system further includes a screening system; the screening system includes:

[0030] A vibrating screen, which has an upper screening area and a lower screening area; the screen frame of the vibrating screen is integrally in a funnel-shaped structure;

[0031] In the upper screening area, a corrugated plate, a lifting structure, at least one section of a scale screen and a tail screen are arranged in sequence along the moving direction of the crop;

[0032] A lower screen is arranged in the lower screening area corresponding to the scale screen;

[0033] A front sealing structure is hermetically fixed at the front end of the corrugated plate;

[0034] A seed separation structure is arranged at the end of the lower screen and straddles between the seed collection area and the residue collection area;

[0035] A driving structure is fixed on the frame and is adapted to drive the vibrating screen to vibrate reciprocally.

[0036] The lifting structure is a jitter screen; the jitter screen includes:

[0037] It should be noted that the "拨动件" in the original text seems to be an incorrect or unclear term. It is recommended to double-check and correct it for a more accurate translation.The mounting member has an assembly surface and a mounting surface facing away from the assembly surface and arranged at an acute angle to the assembly surface; the assembly surface is fixed to the tail end of the corrugated plate;

[0038] A plurality of sieve 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.

[0039] Any of the screen teeth is bent in a stepped manner, and is suitable for guiding crops to move along the screen teeth from the fixed end located on the mounting surface to the free end.

[0040] The front sealing structure comprises:

[0041] 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;

[0042] Two opposite sides of the sealing member in the width direction correspond to the left and right side walls of the frame and are spaced apart from each other.

[0043] The front sealing structure further includes:

[0044] 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, which has an extension margin for the reciprocating vibration of the vibrating screen.

[0045] The front sealing structure further includes:

[0046] The 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.

[0047] The seed separation structure comprises:

[0048] An isolation member is provided between the seed collection area and the debris collection area and is fixed to the screen frame; an isolation surface of the isolation member extends from one side of the seed collection area to above the debris collection area;

[0049] A front curtain extends in the same direction as the isolation surface, with one end fixed on the isolation member and the other end resting 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 that connects the seed collection area and the debris collection area.

[0050] The seed separation structure further comprises:

[0051] 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.

[0052] The driving structure includes:

[0053] Two bearing seats are 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;

[0054] A transmission shaft, both ends of which are fixed in the outer spherical bearings;

[0055] Two eccentric bearings are fixed at both ends of the transmission shaft in a mirror-image manner;

[0056] 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;

[0057] The driving wheel is fixed to 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.

[0058] The reciprocating guide structure comprises:

[0059] Two track bearings are symmetrically arranged on both sides of the screen frame and away from one end of the transmission shaft;

[0060] Two vibrating rails are symmetrically arranged on the frames on both sides of the screen frame; the guiding directions of the vibrating rails are arranged at an angle to the horizontal plane; the rail bearings are slidably arranged in the vibrating rails in one-to-one correspondence.

[0061] The threshing and cleaning system also includes an air supply system; the air supply system includes:

[0062] a fan having an air outlet;

[0063] 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;

[0064] 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;

[0065] 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 provided between the tail cover and the vibrating screen to guide the air supply toward the discharge port;

[0066] 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 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 are gradually increased in height;

[0067] The fan housing has a cylindrical mounting cavity;

[0068] The two ends of the fan housing in the axial direction are respectively provided with a first air inlet connected to the outside world;

[0069] 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.

[0070] The cleaning transmission system includes:

[0071] 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;

[0072] The first transmission path includes an output pulley, a first threshing pulley and a second threshing pulley;

[0073] The second transmission includes an output pulley and a chopper pulley;

[0074] 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 a transmission manner.

[0075] Also includes:

[0076] The first transition wheel is fixed on the frame and is arranged between the output pulley and the chopper pulley; the output pulley is in driving connection with the first transition wheel; and the first transition wheel is in driving connection with the chopper pulley.

[0077] Also includes:

[0078] 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 to the screening pulley.

[0079] The three-way transmission all adopts V-belt transmission connection.

[0080] The first threshing pulley and the second threshing pulley are connected via a combined belt transmission.

[0081] The invention also includes a plurality of tensioning assemblies distributed between adjacent pulleys and suitable for tensioning the V-belts between the adjacent pulleys.

[0082] Any of the tensioning assemblies includes:

[0083] A tensioning arm, one end of which is hingedly arranged on the frame and the other end is a free end;

[0084] a tensioning wheel fixed to the free end of the tensioning arm;

[0085] a pull rod, fixed on the frame;

[0086] A tension spring is provided between the pull rod and the tensioning arm;

[0087] The tension wheel is tensioned and abutted against the V-belt by the biasing force of the tension spring.

[0088] The grain auger is passed through the frame, with one end of the grain pulley fixed and the other end connected to the granary auger; a direction-changing gear box is arranged between the grain auger and the granary auger.

[0089] The miscellaneous auger is passed through the frame, with one end of the miscellaneous pulley fixed and the other end connected to the re-take-off auger; a direction-changing gear box is arranged between the miscellaneous auger and the re-take-off auger.

[0090] The distribution structure includes:

[0091] Grass dividing plate, fixed on the upper edge of the grass discharge port;

[0092] The surface of the grass separating plate is gradually expanded from the grass discharge port toward an end away from the grass discharge port;

[0093] 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.

[0094] The first grass guide plate is arranged at one end close to the grass discharge port; and further comprises:

[0095] A plurality of second grass guide plates are spaced apart on the lower surface of the grass separating plate in a direction parallel to the edge of the grass discharge opening and located at an end away from the grass discharge opening; the second 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;

[0096] The number of the second grass guide plates is greater than the number of the first grass guide plates.

[0097] The technical solution of this application has the following advantages:

[0098] 1. The present application provides a combine harvester in which a cab and a crop conveying structure are arranged side by side at the front of the frame, a threshing and cleaning system and a grain storage assembly are arranged side by side at the rear of the frame, the crop conveying structure communicating with a feeding port of the threshing and cleaning system, the feeding port being located at the front of the threshing and cleaning system and adjacent to the grain storage assembly, and a spreading mechanism in the threshing and cleaning system being located at the rear end of the threshing and cleaning system and adjacent to the grain storage assembly. An engine is fixed to the chassis of the frame between the cab and the grain storage assembly and is adapted to drive the cleaning drive system, which is arranged on the threshing and cleaning system and located on the side facing away from the grain storage assembly. The feeding port is located in the middle of the frame, so that the connection between the crop conveying structure and the harvesting platform is located near the center of the harvesting platform, allowing for more uniform crop feeding from both sides of the harvesting platform into the connection port. Furthermore, the spreading mechanism is located near the grain storage assembly, utilizing the "X"-shaped threshing pattern of the double-helix threshing conveying system to ensure crop entry from the front center of the harvester and dispersal from the rear center, thereby ensuring the stability of the combine harvester's center of gravity. The cleaning drive system is located outside the threshing system, with centralized transmission for easy installation and commissioning. The machine has a compact structure and takes up little space. It maintains a stable center of gravity during idle operation and harvesting, resulting in high maneuverability and significant operating efficiency.

[0099] 2. The combine harvester provided in the present application has two threshing spaces arranged horizontally and spaced apart in the front and back directions of the harvester's travel. The threshing spaces are hollow cylindrical mounting cavities surrounded by a concave plate screen and a cylinder cover, and a roller is installed in each mounting cavity. Guide members are arranged at intervals on the inner wall 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 are guided by the guide members to enter the second threshing space from the first threshing space. 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 a sufficiently long threshing path can be guaranteed, which fully guarantees the threshing effect while ensuring the overall maneuverability of the harvester.

[0100] 3. The combine harvester provided in this application has a limit adjustment structure installed at the gap formed between the outer screen surface of the two concave screens and the transition screen plate. The limit adjustment structure is detachably fixed to the concave screens on both sides. When the limit adjustment structure is not installed, some crops only pass through the first concave screen and then fall through the gap into the vibrating screen below, directly entering the subsequent process. When the limit adjustment structure is installed, the crops pass from the first concave screen through the transition screen and into the second concave screen in a complete "J" shape, resulting in a longer transmission path and better threshing and screening effects.

[0101] 4. The combine harvester provided by the present application has a vibrating screen with an upper screening area and a lower screening area. A lifting structure is provided at the tail end of the corrugated plate in the upper screening 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 lifting structure, which can fully shake out and loosen the clumped 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 provided 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 provided between the grain collection area and the miscellaneous collection area below the vibrating screen to effectively separate the clean grains from miscellaneous grains such as straw, so that the grain collection is more complete and cleaner, avoiding waste and improving the screening efficiency.

[0102] 5. The combined harvester provided in the present application has a lifting structure that is a shaking screen, including a mounting member and a plurality of screen teeth. The mounting member has an assembly surface and a mounting surface that is opposite to the assembly surface and is arranged at an acute angle to the assembly surface. 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 to 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, thereby shaking and loosening the crops. In addition, the shaking screen can be set on the corrugated plate at different inclination angles according to different needs, making full use of space and making the screening system more compact while ensuring the screening effect.

[0103] 6. The combine harvester provided in this application has a seal fixedly disposed between a front material plate below the harvester's threshing drum, which is used to guide the downward movement of grains, and a fan housing below the front material plate. The width of the seal is no less than the width of the vibrating screen surface between the front material plate and the fan housing, and two opposing sides of the seal in the width direction correspond to and are spaced apart from the left and right side walls of the frame. The seal blocks the opening connected to the vibrating screen, which is defined by the upper front material plate, the lower fan housing, and the left and right side walls of the frame. Crop grains are blocked by the seal and fall along the fan housing back to the seed collection area below the vibrating screen, thereby preventing crop grains from flying out of the opening and falling to the ground, causing waste.

[0104] 7. The combine harvester provided in the present application 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 isolation 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 isolation surface, with one end fixed on the isolating member and the other end resting on the bottom shell of the grain in the grain collecting area to block the opening formed between the isolating member and the bottom shell of the grain connecting the grain collecting area and the debris collecting area, so that the air 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, thereby preventing the return air from carrying debris into the grain collecting area 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 screen, thereby improving the air selection effect.

[0105] 8. The combine harvester provided herein has an air supply passage formed between a bottom housing at the bottom of the harvester and a threshing system at the top. The bottom housing comprises a fan housing, a grain bottom housing, a waste bottom housing, and a vibrating screen frame, which are arranged in sequence. A tail hood is installed at the rear end of the threshing system, away from the fan. A discharge port is formed between the tail hood and the screen frame. A flow blocker is provided between the tail hood and the vibrating screen to direct the air supply toward the discharge port.

[0106] In the vertical direction, the height of the discharge port is higher than the height of the air outlet, and the air outlet is tilted toward the discharge port. The fan housing, grain bottom shell, debris bottom shell and screen frame are tilted from one side of the air outlet toward the discharge port and gradually increased in height. A first air inlet connected to the outside world is provided at each end of the fan housing. A second air inlet is provided along the circumference of the side wall in the middle of the fan housing opposite to the air outlet. Air is supplied through three air inlets evenly distributed on the fan housing, making the air volume in the fan uniform and stable. The air outlet is gradually increased in height toward the discharge port to improve fluidity, and a baffle is installed on the tail cover to guide the supply air toward the discharge port, preventing return air from entering the threshing system and 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 separation efficiency.

[0107] 9. The combine harvester provided in the present application 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 waste pulley and a screening pulley, and all the pulleys are connected by transmission. The power inputs of the harvester's threshing mechanism, chopping mechanism, air separation mechanism, grain silo mechanism, waste re-threshing mechanism and screening mechanism are all arranged on the same side of the frame, making the transmission system structure of the whole machine compact. All transmission pulleys are arranged on the same side, which is convenient for installation, control and debugging. In addition, 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

[0108] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0109] FIG1 is a structural schematic diagram of a combine harvester according to an embodiment of the present application;

[0110] FIG2 is a second structural diagram of a combine harvester according to an embodiment of the present application;

[0111] FIG3 is a structural schematic diagram of a concave plate screen according to an embodiment of the present application;

[0112] FIG4 is a schematic diagram of the assembly structure of the concave plate screen in an embodiment of the present application;

[0113] FIG5 is a schematic diagram of the assembly structure of the concave screen, the drum cover and the drum in an embodiment of the present application;

[0114] FIG6 is a second structural diagram of the concave plate screen according to an embodiment of the present application;

[0115] FIG7 is a third structural diagram of the concave plate screen according to an embodiment of the present application;

[0116] FIG8 is a schematic diagram of the exploded structure of the concave plate screen and the cylinder cover assembly in an embodiment of the present application;

[0117] FIG9 is a schematic structural diagram of a double drum in an embodiment of the present application;

[0118] FIG10 is a schematic diagram of the movement of crops in a double-drum structure according to an embodiment of the present application;

[0119] FIG11 is a schematic structural diagram of the first roller in an embodiment of the present application;

[0120] FIG12 is a schematic structural diagram of the second roller in an embodiment of the present application;

[0121] FIG13 is a schematic structural diagram of the cylinder cover in an embodiment of the present application;

[0122] FIG14 is a schematic diagram of the distribution structure of the grass guide plates in an embodiment of the present application;

[0123] FIG15 is a schematic structural diagram of a screening system according to an embodiment of the present application;

[0124] FIG16 is a schematic structural diagram of a shaking screen in an embodiment of the present application;

[0125] FIG17 is a schematic structural diagram of a mounting plate according to an embodiment of the present application;

[0126] FIG18 is a schematic structural diagram of a sieve fork assembly according to an embodiment of the present application;

[0127] FIG19 is a schematic diagram of the assembly structure of the shaking screen in an embodiment of the present application;

[0128] FIG20 is a schematic diagram of the sealing plate installation structure according to an embodiment of the present application;

[0129] FIG21 is a schematic structural diagram of a front sealing structure in an embodiment of the present application;

[0130] FIG22 is a schematic structural diagram of a grain separation structure in an embodiment of the present application;

[0131] FIG23 is a schematic structural diagram of an isolating member in an embodiment of the present application;

[0132] FIG24 is a structural diagram of a vibrating screen drive according to an embodiment of the present application;

[0133] FIG25 is a second structural diagram of a vibrating screen drive according to an embodiment of the present application;

[0134] FIG26 is a schematic structural diagram of a track bearing on a vibrating screen according to an embodiment of the present application;

[0135] FIG27 is a schematic structural diagram of a vibration guide rail according to an embodiment of the present application;

[0136] FIG28 is a schematic structural diagram of a linkage member in an embodiment of the present application;

[0137] FIG29 is a structural diagram 1 of the air supply system according to an embodiment of the present application;

[0138] FIG30 is a second structural diagram of the air supply system according to an embodiment of the present application;

[0139] FIG31 is a schematic structural diagram of a flow-blocking member in an embodiment of the present application;

[0140] FIG32 is a schematic structural diagram of a fan housing according to an embodiment of the present application;

[0141] FIG33 is a schematic diagram of the installation structure of the windshield member in an embodiment of the present application;

[0142] FIG34 is a schematic cross-sectional view of a fan structure according to an embodiment of the present application;

[0143] FIG35 is a schematic structural diagram of a fan shaft in an embodiment of the present application;

[0144] FIG36 is a perspective view of a fan structure according to an embodiment of the present application;

[0145] FIG37 is a structural diagram 1 of the cleaning transmission system according to an embodiment of the present application;

[0146] FIG38 is a schematic structural diagram of the tensioning assembly at S in FIG37 ;

[0147] FIG39 is a second structural diagram of the cleaning transmission system according to an embodiment of the present application;

[0148] FIG40 is a schematic structural diagram of a chopper in an embodiment of the present application;

[0149] FIG41 is a schematic structural diagram of a fixed blade holder according to an embodiment of the present application;

[0150] FIG42 is a schematic structural diagram of the movable knife roller in an embodiment of the present application;

[0151] FIG43 is a schematic diagram of the distribution structure of the movable knife holder after the movable knife roller is unfolded along its generatrix in an embodiment of the present application;

[0152] FIG44 is a schematic structural diagram of the movable knife holder in an embodiment of the present application;

[0153] FIG45 is a schematic diagram of the assembly structure of the movable blade in an embodiment of the present application;

[0154] FIG46 is a schematic diagram of the structure of the anti-entanglement ring in an embodiment of the present application;

[0155] FIG47 is a schematic diagram of the assembly structure of the distribution structure according to an embodiment of the present application;

[0156] Figure 48 is a schematic structural diagram of the grass dividing board in an embodiment of the present application.

[0157] Description of reference numerals:

[0158] H, vibrating screen; M, grain collection area; N, debris collection area; W, working area; D, weed removal area; K, anti-entanglement ring;

[0159] 1. Frame; 2. Vehicle frame; 3. Travel mechanism; 41. Cutting platform; 42. Crop transport mechanism; 51. Engine; 52. Gearbox; 61. Grain silo; 62. Grain unloading drum; 7. Cab; 8. Dust cover;

[0160] 2a, first roller; 3a, second roller; 4a, roller shaft; 5a, web plate; 51a, adjustment hole; 52a, limit slot; 53a, web plate seat; 6a, threshing tooth rod; 7a, toggle tooth; 8a, connecting plate; 9a, anti-entanglement ring;

[0161] 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;

[0162] 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, handle portion; 92c, threaded portion; 93c, washer;

[0163] 1d, mounting plate; 11d, mounting surface; 12d, assembly surface; 2d, screen teeth; 3d, screen fork unit; 4d, screen fork assembly; 5d, pressing plate; 6d, corrugated plate; 7d, fish scale screen; 8d, lower screen;

[0164] 1e, partition plate; 11e, flange; 2e, connecting plate; 3e, front curtain; 4e, rear curtain; 5e, seed bottom shell; 6e, miscellaneous bottom shell;

[0165] 1f, sealing plate; 2f, front material plate; 3f, fan housing; 31f, first air inlet; 32f, second air inlet; 33f, air outlet; 4f, visual component; 5f, screen front plate; 6f, first shielding member; 7f, second shielding member; 8f, butterfly nut;

[0166] 2g, bearing seat; 3g, transmission shaft; 4g, eccentric bearing; 5g, driving wheel; 61g, track bearing; 62g, vibration track; 7g, linkage; 71g, ring; 72g, linkage plate; 8g, counterweight; 9g, protective plate;

[0167] 1h, screen frame; 11h, rear slide; 12h, adjustment plate; 2h, tail screen; 21h, mounting seat; 22h, tail screen piece;

[0168] 1i, fan shaft; 11i, flat groove; 2i, fan blade; 3i, fan blade bracket; 31i, mounting section; 32i, fixing section; 4i, reinforcement plate; 51i, first windshield; 52i, second windshield;

[0169] 1j, rear sealing plate; 2j, tail cover; 3j, flow control element; 31j, threshing sealing plate; 32j, tail cover sealing plate; 41j, upper air guide plate; 42j, lower air guide plate; 5j, discharge port;

[0170] 1k, ring plate; 11k, bottom plate; 12k, side plate; 2k, card plate; 3k, slot; 4k, obstacle clearance slot; 5k, assembly hole;

[0171] 1p, grass dividing plate; 11p, extension section; 2p, first grass guide plate; 3p, second grass guide plate; 10p, grass discharge port;

[0172] 1r, moving knife roller; 2r, moving blade; 3r, fixed knife holder; 4r, fixed blade; 5r, moving knife holder; 10r, left side wall; 11r, right side wall;

[0173] 1s, output pulley; 10s, intermediate drive 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, tensioning arm; 82s, tensioning pulley; 83s, pull rod; 84s, tension spring; 9s, reversing gearbox. DETAILED DESCRIPTION

[0174] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0175] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0176] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0177] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0178] Example 1

[0179] This embodiment provides a combine harvester, as shown in Figure 1, including a frame 2, a walking 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.

[0180] 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 side by side at the front of the frame 2. The threshing and cleaning system includes a double-helix threshing and conveying system, which has an X-shaped threshing direction. The threshing and cleaning system and the grain storage assembly are arranged side by side 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. 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. The gearbox 52 is arranged at the front of the frame 2 and is located 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. 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 located in the middle of the frame 2, so that the connection between the crop conveying structure 42 and the cutting table 41 is located near the middle of the cutting table 41, allowing the cutting table 41 to feed crops more evenly. At the same time, the spreading structure is located near the grain storage component, utilizing the "J" threshing pattern of the double-helix threshing conveying system, allowing crops to enter from the middle of the front end of the harvester and be spread out from the middle of the rear end, ensuring the stability of the combine harvester's center of gravity. The cleaning transmission system is located outside the threshing system, with centralized transmission, facilitating installation and commissioning. The entire machine has a compact structure and occupies a small space. It maintains a stable center of gravity during idle operation and harvesting operations, resulting in high maneuverability and significant operating efficiency.

[0181] As shown in Figure 2, the grain storage assembly includes a grain silo 61 and a grain discharge drum 62. A lifting auger is located between the grain silo 61 and the threshing and cleaning system. Clean grain from the threshing and cleaning system is transported into the grain silo 61 via the lifting auger. In this embodiment, the lifting auger is located between the grain silo 61 and the threshing and cleaning system. The grain discharge drum 62 is mounted above the grain silo 61 and the threshing and cleaning system and is fixed to the threshing and cleaning system. As shown in Figure 2, a dust cover 8 is provided on the water tank located outside the cab 7.

[0182] In this embodiment, the threshing and cleaning system includes a twin-spiral threshing conveyor system, a screening system, and an air supply system. As shown in Figure 3, the twin-spiral threshing conveyor system includes two threshing chambers spaced horizontally and spaced apart in the direction of travel of the harvester. The threshing chambers are hollow cylindrical mounting cavities formed by a concave screen and a drum cover, with a drum mounted within each chamber. Guide members are spaced apart on the inner wall of the drum cover to guide crops entering the threshing chambers in a directional movement around an axis. Rotation of the drums drives the crops, which are guided by the guide members from the first threshing chamber to the second threshing chamber. The working areas of the two threshing chambers are the same length, ensuring that the crop threshing path covers the length of both drums, ensuring sufficient threshing. The horizontal spacing of the two threshing chambers makes the structure more compact on the frame. The equal length of the two threshing working areas ensures a sufficiently long threshing path, ensuring both overall maneuverability and efficient threshing.

[0183] As shown in Figure 4, the two concave screens are a first concave screen 2b with a feeding port 21b and a second concave screen 3b located adjacent to the first concave screen 2b in the crop transport direction. The first and second concave screens 2b and 3b are identical in length, i.e., their screening areas have the same length. The inner screen surface of each concave screen is arc-shaped, and the axes of the two concave screens are parallel to each other and fixed horizontally to the frame 1 at intervals.

[0184] As shown in Figure 3, each concave screen includes two side guard plates 4b, two connecting beams 5b, multiple grid bars 51b, multiple steel wires 41b, and several reinforcing ribs 8b. The two side guard plates 4b are arc-shaped, coaxial, and oppositely arranged. The ends of the two side guard plates 4b are welded together by the connecting beam 5b, and the 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 parallel to the connecting beam 5b and are fixed across the two side guard plates 4b. The spacing between adjacent grid bars 51b is uniform, and they are evenly spaced and radially distributed along the side guard plates 4b. That is, the planes on which each grid bar 51b is located intersect the axis of the concave screen, and the center of the arc on which the side guard plates 4b are located is located on this axis. Each grid bar 51b is provided with a plurality of through holes at even intervals. The steel wire 41b is arranged parallel to the side guard plate 4b and passes through the through holes of each grid bar 51b in sequence. The two ends of the steel wire 41b are fixed to the connecting beam 5b or the grid bar 51b respectively. All grid bars 51b and steel wires 41b intersect with 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 at intervals on the outer screen surface. 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.

[0185] In this embodiment, the separation angles of the first and second concave screens 2b and 3b are both 180 degrees, meaning the side guard plates 4b are generally semicircular. A separation angle greater than 180 degrees wastes space above the concave screens. Furthermore, the curvature of the upper portion of the screens can cause grains to escape from the upper portion and then fall back into the screens, affecting the cleaning effect. A separation angle less than 180 degrees reduces the screen surface area, also impacting cleaning performance.

[0186] In this embodiment, the area of ​​the grid cells in the first concave screen 2b is smaller than the area of ​​the grid cells in the second concave screen 3b, so that only crop grains pass through the first concave screen 2b, while the second concave screen is suitable for passing grains and other small debris, thereby preventing the debris from entraining the grains and discharging them from the grass discharge port, causing loss. 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.

[0187] As shown in Figure 3, two concave screens each have a radially extending transition opening 6b on one end of the same side of the frame. The two transition openings 6b are positioned opposite each other, interconnecting the two concave screens through the transition openings 6b. A transition plate screen 7b is positioned between the two transition openings 6b. The transition plate screen 7b comprises a screen frame having a square structure, with grid bars 51b spaced evenly across the frame. Similarly, each grid bar 51b has multiple evenly spaced through holes, through which the steel wire 41b passes in sequence longitudinally. The square screen frame has a horizontal width and a longitudinal length. A feed port 21b is positioned on the side of the first concave screen 2b opposite and away from the transition opening 6b. The crop's path from the feed port 21b into the concave screen forms a "J"-shaped path.

[0188] As shown in Figure 4, three mounting beams 11b are spaced apart on the frame 1. The connecting beams 5b on either side of the first concave screen 2b are overlapped and fixed between the first and second mounting beams 11b. Similarly, the connecting beams 5b on either side of the second concave screen are overlapped and fixed between the second and third mounting beams 11b. A transition port 6b is provided near one side of the frame 1. This structural design allows for a compact layout of the two concave screens on the harvester frame 1 while also improving the path of the crop passing through the concave screens for threshing, significantly enhancing the overall maneuverability and threshing efficiency of the harvester.

[0189] A hollow cylindrical mounting cavity is formed between the cylinder cover and the corresponding concave screen, which forms a threshing space. As shown in Figure 5, the first cylinder cover 2c and the first concave screen 2b form a first threshing space. The first roller 2a is installed in the first threshing space, and a gap is set between the first concave screen 2b and the end face of the toggle teeth of the first roller 2a. The second cylinder cover 3c and the second concave screen 3b form a second threshing space. The second roller 3a is installed in the second threshing space. At the same time, a gap is set between the second concave screen 3b and the end face of the toggle teeth of the second roller 3a. The transition port 6b connects the first threshing space and the second threshing space, and crops enter the second threshing space from the first threshing space via the transition screen 7b.

[0190] As shown in Figure 6, a limit adjustment structure is installed at the gap 10b formed between the outer screen surface of the two concave screens and the transition screen plate. The limit adjustment structure is removably fixed to the first concave screen 2b and the second concave screen 3b on both sides. When the limit adjustment structure is not installed, some crops only pass through the first concave screen 2b before falling through the gap 10b onto the vibrating screen below and directly entering the subsequent process. When the limit adjustment structure is installed, the crops pass from the first concave screen 2b, through the transition screen 7b, and into the second concave screen 3b in a complete "J" shape, resulting in a longer transmission path and better threshing and screening effect.

[0191] 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 adjustment member connecting the sealing plate 9b and the two concave plate sieves. As shown in FIGS. 6 and 7, the adjustment member includes an adjustment plate 91b and two mounting plates 92b fixed on both sides of the adjustment plate 91b. The plate surface of the adjustment plate 91b is in an arc shape matching the concave plate sieve fixed thereto. The two mounting plates 92b are arranged along the curvature of the adjustment plate 91b and are respectively fixed on opposite sides of the adjustment plate 91b. One mounting plate 92b is used for fixedly connecting the concave plate sieve, and the other mounting plate 92b is used for fixedly connecting the sealing plate 9b. In this embodiment, the cross-section of the adjustment member is in a U shape, and the adjustment plate 91b and the mounting plates 92b on both sides are integrally formed. The plate surface of the adjustment plate 91b is suitable for partially blocking the transition port 6b. The adjustment plate 91b can select different widths of plate surface sizes according to needs to adjust the size of the transition port 6b for the passing crops, so as to partially extend the transmission path of the crops and extend the threshing, separation and screening time of the crops.

[0192] As shown in FIG. 8, the radian of the cross-section of the concave plate sieve and the cylinder cover is 180 degrees. There are multiple locking assemblies, and any one of the locking assemblies is suitable for sequentially passing through the mounting frame 22c and the connecting beam 5b and locking and fixing on the assembly beam 11b.

[0193] The connecting beam 5b is horizontally arranged and can be lapped and fitted with the horizontal installation surface of the assembly beam 11b on the frame 1. During installation, only need to place the concave plate sieve between the two assembly beams 11b and make the connecting beam 5b lap on the assembly beam 11b, without need for manual support and welding fixation, reducing a large amount of manpower and material resources.

[0194] As shown in FIG. 8, the mounting frame 22c is square, and the cover body 21c is hinged on one side frame edge of the mounting frame 22c and is suitable for being buckled on the mounting frame 22c. The frame surface of the mounting frame 22c is suitable for lapping and fitting with the surface of the connecting beam 5b, which is convenient for assembly.

[0195] As shown in FIG. 33, the cover body 21c includes a circular arc-shaped top cover 211c and two side top plates 212c blocked on both sides of the top cover 211c. The radian of the top cover 211c is 180 degrees. Guide members are uniformly arranged at intervals on the inner wall surface of the top cover 211c. In this embodiment, the guide member is a grass guiding plate 24c, and the grass guiding plate 24c is an arc-shaped plate arranged along the arc surface of the top cover 211c. As shown in FIG. 34, the grass guiding plate 24c is arranged at a certain angle with the axis of the cylinder cover to facilitate guiding the crops entering the threshing space in the same direction. And to meet the "Z" - shaped trend of the crops between the two threshing spaces, as shown in FIG. 34, in this embodiment, the grass guiding plates 24c in the first cylinder cover 2c and the second cylinder cover 3c are axially symmetrically arranged with respect to the middle assembly beam 11b, that is, the guiding directions of the grass guiding plates 24c in the two cylinder covers are opposite.

[0196] As shown in FIG8 , the locking assembly includes a fastener 9c and a washer 93c. In this embodiment, the fastener 9c is made of hexagonal steel and includes a hexagonal handle 91c and a threaded portion 92c formed below the handle 91c. Accordingly, an assembly hole 110b is formed on the assembly beam 11b, which is threadedly engaged with the threaded portion 92c. A plurality of first mounting holes (not shown) are spaced apart along the frame of the mounting frame 22c. A plurality of second mounting holes 50b are spaced apart on the connecting beam 5b. The first mounting holes, the second mounting holes 50b, and the assembly holes 110b are correspondingly disposed. The fastener 9c sequentially passes through the first and second mounting holes 50b and is secured within the assembly holes 110b. Washers 93c are disposed between the mounting frame 22c and the fastener 9c, and between the connecting beam 5b and the assembly beam 11b. The washers 93c are coaxially sleeved on the threaded portion 92c of the fastener 9c. In this embodiment, the corresponding first mounting hole has a smaller diameter than the second mounting hole 50b to facilitate correction of slight misalignment between the concave screen and the cylinder cover. Furthermore, the first mounting hole may also be provided with an internal thread to cooperate with the external thread of the fastener 9c to increase the strength of the locking.

[0197] To improve installation accuracy, a positioning assembly is also provided. As shown in FIG8 , the positioning assembly includes at least one positioning pin 111b, which is disposed on the mounting beam 11b. In this embodiment, a positioning pin 111b is disposed at each end of each mounting beam 11b, and the positioning pins 111b are cylindrical. Positioning holes 501b are respectively defined in the connecting beam 5b and the mounting frame 22c, and the positioning holes 501b are adapted to be fitted over the corresponding positioning pins 111b. The positioning holes 501b in the connecting beam 5b and the mounting frame 22c have the same diameter and are slightly larger than the diameter of the positioning pins 111b to facilitate correction of minor misalignments of the first and second mounting holes 50b relative to the mounting holes 110b.

[0198] The concave plate screen and the cylinder cover are integrally assembled to the assembly beam 11b of the harvester frame 1 through the fasteners 9c. The structure is simple, the installation operation is simple and easy, and manpower and material resources are saved.

[0199] As shown in Figures 5 and 9, the axes of the two drums are parallel to each other and spaced apart in the direction of crop transport. Multiple toggles are spaced apart along the drum axis 4a on each drum. A working area W is formed between the two toggles located at either end of the drum. The two working areas W are the same length as the corresponding concave screens. In this embodiment, the two concave screens are the same length. As shown in Figure 30, crops enter the first drum 2a from the feeding port 21b. The first drum 2a rotates to thresh the crops and spirally conveys them to the second drum 3a located behind it. The second drum 3a then rotates to thresh the crops and spirally conveys them to the grass discharge area D, where the threshed straw is discharged. The crops spiral through the dual-drum structure in a zigzag pattern, with a stroke length equal to the sum of the lengths of the two drums. This results in a long threshing stroke and a significant threshing effect. The two drums are flush at one end and arranged axially parallel to each other, eliminating excess space and making the combine harvester compact.

[0200] The first roller 2a and the second roller 3a have the same overall structure, differing in that a grass discharge area D is added at the end of the crop travel of the second roller 3a. As shown in Figures 31 and 32, each roller comprises a roller shaft 4a, a plurality of webs 5a, and multiple threshing gears 6a. In this embodiment, three webs 5a are installed in the working area W of each of the first roller 2a and the second roller 3a, and one web 5a is installed in the grass discharge area D of the second roller 3a. All webs 5a are evenly spaced and fixed to their corresponding roller shafts 4a via web 5a holders.

[0201] Several mounting portions are spaced apart on the outer circumference of each web 5a. In this embodiment, each mounting portion includes a limiting groove 52a and a plurality of groups of adjustment holes 51a disposed on the outer periphery of the limiting groove 52a. The groove shape of the limiting groove 52a matches the threshing gear 6a and is suitable for receiving the threshing gear 6a. A connecting rod is welded to the threshing gear 6a. The threshing gear 6a and web 5a are detachably connected via a connecting plate 8a. The connecting plate 8a has through holes corresponding to the respective groups of adjustment holes 51a. Bolts pass through the corresponding adjustment holes 51a and the through holes of the connecting plate 8a to secure the threshing gear 6a to the web 5a. By securing the bolts in different adjustment holes 51a, the angle of the toggle member on the threshing gear 6a can be adjusted.

[0202] As shown in Figure 31, in this embodiment, each web 5a has eight limiting slots 52a, six of which are evenly spaced around the circumference of the web 5a. Two additional limiting slots 52a serve as spare slots and are positioned opposite each other on the outer circumference of the web 5a. In this embodiment, six threshing gear rods 6a are provided, each secured within one of the six limiting slots 52a evenly spaced around the circumference of the web 5a. Each threshing gear rod 6a is provided with multiple toggle members, which in this embodiment are cylindrical toggle teeth 7a. The toggle teeth 7a on adjacent threshing gear rods 6a are spaced apart in the axial direction of the drum to enhance the threshing effect.

[0203] All toggle teeth 7a within the working area W are identical in size. As shown in Figure 5, the toggle teeth 7a on the same drum have the same inclination angle relative to the drum axis 4a, forming a radial structure. The distance from the end face of any toggle tooth 7a to the drum axis defines the drum's rotation radius. When the drum rotates, the end faces of all toggle teeth 7a together form a cylindrical surface. In this embodiment, as shown in Figure 5, the lowest point of the cylindrical surface of the second drum 3a is higher than the lowest point of the cylindrical surface of the first drum 2a. Furthermore, the rotation radius of the second drum 3a is smaller than that of the first drum 2a. At the same time, the height of the drum axis 4a of the second drum 3a is higher than that of the first drum 2a, and the highest points of the rotating cylindrical surfaces of the second drum 3a and the first drum 2a are at the same horizontal level. This structural design increases the distance between the drum that contacts the crop and the horizontal vibrating screen below, ensuring that any debris falling from the drum that contacts the crop onto the vibrating screen is adequately filtered by the wind.

[0204] On the crop's travel path, as shown in Figures 31 and 32, anti-entanglement rings 9a are respectively provided at the connecting ends of the first roller 2a and the second roller 3a, that is, as shown in Figure 9, the first roller 2a is fixed to one end of the roller shaft 4a of the right frame 1 and an anti-entanglement 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-entanglement ring 9a is provided to prevent crop straw from being entangled on the roller shaft 4a and hindering crop transportation.

[0205] The working process of the double screw conveying system in this embodiment is as follows:

[0206] The crops enter the first threshing space through the feed inlet 21b. Agitated by the rotary element of the drum, the crops are centrifugally moved along the concave screen and the inner wall of the drum cover. Guided by the guide elements on the drum cover, the crops move in a spiral motion in a predetermined direction. From the feed inlet 21b, the crops travel along the first threshing space to the transition port, passing through the transition screen into the second threshing space. They are threshed in a spiral motion in the opposite direction to that in the first threshing space, and then enter the grass discharge area D. The crops are threshed in both threshing spaces in a spiral motion, following the "J"-shaped path formed by the two threshing spaces. This allows for a longer travel distance and more complete threshing.

[0207] As shown in Figures 15, 19, 25, and 26, the screening system includes a vibrating screen H, a front sealing structure, a grain separation structure, and a drive 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 height difference between the corrugated plate 6d and the fish scale screen 7d. In conjunction with the tail screen 2h at the tail end, a two-stage lifting structure is formed to fully shake out and loosen the clumped crops, preventing the crop straw from entraining and entraining the grains when discharged, 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 miscellaneous collection area N below the vibrating screen H to effectively separate the clean grains from miscellaneous grains such as straw, making the collection of grains more complete and cleaner, avoiding waste and improving screening efficiency.

[0208] As shown in Figures 15 and 19, the screen frame 1h of the vibrating screen H has an overall funnel-shaped structure. In this embodiment, the lifting structure is a shaking screen. The upper screen area is sequentially arranged along the direction of crop movement, including a corrugated plate 6d, a shaking screen, at least one section of fish-scale screen 7d, and a tail screen 2h. The lower screen 8d is provided in the area corresponding to the fish-scale screen 7d. In this embodiment, the fish-scale screen 7d is arranged in two sections spaced apart horizontally, and the fish-scale screens in the two sections of the fish-scale screen 7d are arranged at an angle. For example, the fish-scale screens on the first section of the fish-scale screen 7d near the corrugated plate 6d are arranged vertically upward, while the fish-scale screens on the second section of the fish-scale screen 7d near the tail screen 2h are arranged at an angle toward the tail screen 2h. As shown in Figure 1, the tail screen 2h comprises a mounting base 21h and multiple tail screen 2h pieces. The mounting base 21h is tilted in the same direction as the fish-scale screen pieces in the adjacent second-stage fish-scale screen 7d and fixed to the screen frame 1h. The multiple tail screen 2h pieces extend diagonally upward from the mounting base 21h in the direction of crop movement and are evenly spaced horizontally on the mounting base 21h. The upward-lifting tail screen 2h pieces form a second-stage lifting structure, fully loosening crop debris.

[0209] As shown in Figure 19, a rear slide plate 11h and an adjustment plate 12h that can be slidably arranged along the surface of the rear slide plate 11h are provided on the screen frame 1h located at one end of the tail screen 2h. The rear slide plate 11h and the adjustment plate 12h are in surface contact with each other. Three through holes (not shown in the figure) are evenly spaced apart on the rear slide plate 11h, and three long waist holes are correspondingly provided on the adjustment plate 12h. The adjustment plate 12h is provided on the outside of the rear slide plate 11h, and is passed through the long waist holes and fixed in the through holes of the rear slide plate 11h by bolts. When the bolts are loosened, the adjustment plate 12h can slide up and down along the surface of the rear slide plate 11h to adjust the size of the tail crop outlet.

[0210] As shown in Fig. 16, the jitter sieve includes a mounting member and a plurality of sieve teeth 2d. In this embodiment, the mounting member is a plate-like structure, that is, the mounting plate 1d. The mounting plate 1d has an assembly surface 12d and a mounting surface 11d on the side facing away from the assembly surface 12d and disposed at an acute angle to the assembly surface 12d. In this embodiment, as shown in Fig. 17, the middle of the mounting plate 1d is bent to form a slope with a certain inclination angle, and this slope forms the mounting surface 11d for fixing the sieve teeth 2d. The lower bottom surface of the mounting plate 1d forms the assembly surface 12d. That is, as shown in Fig. 19, when the jitter sieve is integrally assembled to the end of the corrugated plate 6d, the assembly surface 12d is fixedly adhered to the corrugated plate 6d surface to surface. The sieve 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 fixedly spaced on the mounting surface 11d, and the other end is a free end, which is suspended. When the vibrating sieve vibrates reciprocally as a whole, the crop slides from the corrugated plate 6d onto the jitter sieve and is shaken up by the suspended sieve teeth 2d and then falls onto the fish-scale sieve 7d, realizing the shaking and loosening of the crop. In addition, the jitter sieve can be arranged on the corrugated plate 6d at different inclination angles according to different needs, making full use of the space and making the screening system more compact while ensuring the screening effect.

[0211] As shown in Fig. 18, in this embodiment, the sieve teeth 2d are cylindrical structures. Of course, they can also be sheet-like structures, depending on the specific situation. Any sieve tooth 2d is bent in a stepped shape and is suitable for guiding 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 two sieve teeth 2d are fixedly connected to form a U-shaped sieve fork unit 3d. 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 shown in Fig.​​​​​​​​As shown in Figure 20, the front sealing structure includes a seal, a first shielding member 6f, and a second shielding member 7f. The seal is fixed between the front material plate 2f and the fan housing 3f below the front material plate 2f. The width of the seal is no less than the screen surface width of the vibrating screen H between the front material plate 2f and the fan housing 3f. The two opposing sides of the seal in the width direction correspond to the left and right side walls of the frame 1 and are provided with gaps therebetween. In this embodiment, the seal is a sealing plate 1f. The upper end of the sealing plate 1f is provided with a flange, which is bolted to the lower surface of the front material plate 2f. The lower end of the sealing plate 1f is also bolted to the flange of the fan housing 3f. The gaps between the two sides of the sealing plate 1f and the left and right side walls of the frame 1 are sealed and fixed with sealant.

[0215] In this embodiment, as shown in Figures 20 and 21 , the sealing plate 1f is bent, with a vertical section near the front material plate 2f and an inclined section near the fan housing 3f. This creates a slope with the outer wall of the fan housing 3f, facilitating the guidance of crop grains escaping from the vibrating screen H. As shown in Figure 20 , at least one observation port is defined in the vertical section of the sealing plate 1f. In this embodiment, two observation ports are provided, each secured with a visual element 4f via a butterfly nut 8f for monitoring crop accumulation on the vibrating screen H. The visual element 4f can be a transparent acrylic or glass plate, preferably acrylic, which is lightweight and unbreakable.

[0216] The opening connected to the vibrating screen H, which is surrounded 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, is blocked by the sealing plate 1f. The crop grains are blocked by the sealing plate 1f and fall along the fan casing 3f back to the grain collection area below the vibrating screen H, so as to prevent the crop grains from flying out of the opening and falling to the ground, causing waste.

[0217] Furthermore, to prevent the accumulation of crop grains between the fan housing 3f and the sealing plate 1f, a first shielding member 6f is provided, as shown in FIG21 . One end of the first shielding member 6f is fixed to the front material plate 2f, located above the vibrating screen H, and the other end is fixed to the front screen plate 5f, located at the front end of the vibrating screen H. The first shielding member 6f is arranged at a predetermined angle to the screen surface of the vibrating screen H. The width of the first shielding member 6f is not less than the width of the screen surface of the vibrating screen H. The first shielding member 6f is flexible, and even after being fixed at both ends, it still has sufficient stretch to allow the vibrating screen H to vibrate back and forth, thereby avoiding obstruction of the vibrating screen H's movement.

[0218] As shown in Figure 21, a second shielding member 7f is fixed on one end of the first shielding member 6f on the front material plate 2f. 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 the two shielding members set in the front and back.

[0219] In this embodiment, both the first shielding member 6f and the second shielding member 7f are made of canvas.

[0220] As shown in FIG. 22, the grain separation structure includes a separator and a front curtain 3e. As shown in FIG. 15, the separator is disposed between the grain collection area M and the tailings collection area N and is fixed to the housing of the vibrating screen. The width of the separator is the same as the widths of the grain collection area M and the tailings collection area N.

[0221] In this embodiment, as shown in FIG. 22, the separator includes a partition plate 1e and connecting plates 2e disposed on both sides of the partition plate 1e. The width of the connecting plates 2e is the same as the width 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 tailings collection area N. The two side plate surfaces of the partition plate 1e form separation surfaces. The front curtain 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 that connects the grain collection area M and the tailings collection area N, so that the air blown by the fan travels along the front curtain 3e and the partition plate 1e and is blown 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 tailings into the grain collection area M and polluting 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 air separation.

[0222] The front curtain 3e is a rubber curtain or a canvas curtain. In this embodiment, the front curtain 3e is a rubber curtain. As shown in FIG. 22 or FIG. 15, a part of the rubber curtain is placed on the grain bottom shell 5e and naturally hangs down along the surface of the grain bottom shell 5e. The rubber curtain in contact with the grain bottom shell 5e surface to surface has a certain adhesion force, which can better prevent the curtain from being blown up by the fan.

[0223] As shown in FIG. 22, a rear curtain 4e is also provided in the tailings collection area N. One end of the rear curtain 4e is fixed to the partition plate 1e, and the other end is placed on the tailings bottom shell 6e in the tailings collection area N, further preventing the return air from lifting the front curtain 3e and causing tailings to enter the grain collection area M. The width of the rear curtain 4e is less than the straight-line distance from the fixing point of the rear curtain 4e on the partition plate 1e to the auger in the tailings collection area N, avoiding entanglement with the rear curtain 4e during the rotation of the auger and causing a failure. Similarly, the rear curtain 4e is a rubber curtain or a canvas curtain. In this embodiment, the rear curtain 4e is a rubber curtain. As shown in FIG. 22 or FIG. 15, a part of the rubber curtain is placed on the tailings bottom shell 6e and naturally hangs down along the surface of the tailings bottom shell 6e. The rubber curtain in contact with the tailings bottom shell 6e surface to surface has a certain adhesion force, which can better prevent the curtain from being blown up by the return air swirling along the inner wall surface of the tailings bottom shell 6e.

[0224] The partition plate 1e, the front curtain 3e and the rear curtain 4e form a herringbone isolation structure and are erected between the grain collection area M and the debris collection area N, which fully isolates the grain collection area M and the debris collection area N to avoid cross contamination and ensure the cleanliness of the grains entering the warehouse.

[0225] As shown in Figure 23, the partition plate 1e has a flange 11e at one end, facing into the debris collection area N, in the seed collection area M. The flange 11e forms an obtuse angle with the surface of the partition plate 1e. This flange 11e is designed to guide the swirling air traveling along the inner wall of the debris bottom shell 6e and the rear curtain 4e, while preventing any crop debris carried in the swirling air from entering the seed collection area M through the opening between the partition plate 1e and the lower screen 8d.

[0226] As an alternative implementation of this embodiment, the rear curtain 4e may not be provided, and only the front curtain 3e may be provided.

[0227] As shown in Figure 24, the drive structure includes two bearing blocks 2g, a transmission shaft 3g, two eccentric bearings 4g, and a drive wheel 5g. The harvester frame consists of multiple vertical support beams 12b and assembly beams interposed between the support beams 12b. A frame housing is mounted between adjacent beams, forming a mounting cavity within which the vibrating screen H is installed.

[0228] As shown in Figure 24, two bearing seats 2g are fixed to the sidewalls of two symmetrical support beams 12b at the rear end of the frame. An outer spherical bearing is installed in each bearing seat 2g, and the ends of the drive shaft 3g are fixed in the outer spherical bearings. Two eccentric bearings 4g are fixed to the ends of the drive shaft 3g in mirror images. One end of the vibrating screen H is fixed to the two eccentric bearings 4g, and the other end is mounted on the frame via a reciprocating guide structure. A drive wheel 5g is fixed to one end of the drive shaft 3g, suitable for being driven by the harvester's drive and driving the drive shaft 3g in rotation. The bearing seats 2g are directly fixed to the support beams 12b of the frame to avoid a transitional connection. The frame directly bears the weight of the vibrating screen H and the inertial force of its reciprocating motion, making the vibration of the vibrating screen H more stable.

[0229] The reciprocating guide structure includes two track bearings 61g and vibration tracks 62g corresponding to the two track bearings 61g. As shown in FIG26 , 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. The two vibration tracks 62g are symmetrically arranged on the frames on both sides of the vibrating screen H. As shown in FIG27 , the vibration track 62g is composed of a bottom plate and side plates arranged opposite to the bottom plate. A guide channel is formed between the two side plates. The guiding direction of the vibration track 62g is set at an angle to the horizontal plane. The track bearings 61g are slidably set in the vibration track 62g.

[0230] A linkage member 7g is provided between the vibrating screen H and the eccentric bearing 4g. As shown in Figure 28, the linkage member 7g comprises a collar 71g and a linkage plate 72g welded to the collar 71g. One end of the collar 71g is open and flanged, perpendicular to the wall of the collar 71g. The collar 71g is sleeved and fixed to the eccentric bearing 4g. The other end of the linkage plate 72g is fixed to the side screen body of the vibrating screen H.

[0231] As shown in Figures 24 and 25 , a protective plate 9g is secured to the support beam 12b near the drive wheel 5g. The plate surface of the protective plate 9g extends radially along the drive shaft 3g. In this embodiment, the protective plate 9g straddles the bearing seat 2g, with a gap therebetween. The protective plate 9g has an area larger than the cross-sectional area of ​​the drive wheel 5g to adequately block debris, such as crop straw, screened from the rear of the vibrating screen H. This prevents debris from entering the drive area on one side of the frame, causing entanglement or blockage, and potentially affecting normal operation of the machine.

[0232] As shown in Figure 24 or Figure 25, a counterweight 8g is detachably installed on the driving wheel 5g, and a counterweight 8g is also provided at one end of the transmission shaft 3g away from the protective plate 9g. The counterweight block is detachably fixed to the connecting block, and the connecting block is fixed to 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 can prevent the vibrating screen H from vibrating too violently, thereby ensuring the balance of the overall vibration of the vibrating screen H.

[0233] As shown in Figure 29, the air supply system includes a fan, an air supply duct, a tail hood 2j, and a flow blocker 3j. The air supply duct is formed between the bottom shell at the bottom of the harvester and the threshing system at the top. The bottom shell includes a fan housing 3f, a seed bottom shell 5e, a waste bottom shell 6e, and a vibrating screen frame 1h, which are arranged in a continuous sequence. The threshing system includes a first roller 2a and a second roller 3a arranged horizontally and spaced apart. A tail hood 2j is installed at the rear end of the threshing system, away from the fan, on the side of the second roller 3a near the discharge port 5j. The discharge port 5j is formed between the tail hood 2j and the screen frame 1h. A flow blocker 3j is placed between the tail hood 2j and the vibrating screen to direct the air toward the discharge port 5j.

[0234] In the vertical direction, the height of the discharge port 5j is higher than that of the air outlet 33f. As shown in Figure 30, the air outlet 33f is arranged obliquely upward. The fan housing 3f, the grain bottom shell 5e, the residual bottom shell 6e, and the screen frame 1h are inclined and gradually increased in height from one side of the air outlet 33f toward the discharge port 5j. A first air inlet 31f is provided at each end of the fan housing 3f, which is connected to the outside world. A second air inlet 32f is provided along the circumference of the side wall of the fan housing 3f opposite the air outlet 33f. Air is supplied through three evenly distributed air inlets on the fan housing 3f, ensuring a uniform and stable air volume within the fan. The air outlet 33f is gradually increased in height toward the discharge port 5j to improve circulation. A flow blocker 3j is installed on the tail cover 2j to guide the supply air toward the discharge port 5j, preventing return air from entering the threshing and screening systems and affecting crop cleanliness. The air supply system has a compact and stable structure, sufficient air volume, and no return air interference, greatly improving air separation efficiency.

[0235] As shown in Figure 30, two air guides are arranged in the vertical direction inside the air outlet 33f, and the air outlet 33f is separated 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 at the top and a lower air guide plate 42j located at the bottom. 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 the appropriate position, the air guide is locked in the waist-shaped hole. It is also possible 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 described in detail here.

[0236] In this embodiment, as shown in Figure 29, the tail hood 2j is bent, and a rear sealing plate 1j is disposed between the tail hood 2j and the second roller 3a. The rear sealing plate 1j is arranged horizontally and hingedly attached to the rear sealing plate 1j, allowing the tail hood 2j to flip upward and open. A cavity is formed between the tail hood 2j and the lower screen frame 1h, and a flow blocker 3j is disposed within this cavity. As shown in Figure 31, the flow blocker 3j includes a threshing sealing plate 31j horizontally fixed to one 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 hood sealing plate 32j is disposed between the threshing sealing plate 31j and the end of the tail hood 2j. The lower surfaces of the threshing sealing plate 31j and the tail hood sealing plate 32j form an air guide surface to prevent air from the fan from rising above the screen frame 1h and entering the cavity between the tail hood 2j and the screen frame 1h. The air then flows back along the cavity wall and enters the threshing system or screening system, thereby affecting crop cleanliness and air separation efficiency. In this embodiment, the tail cover sealing plate 32j is arranged in two sections of plate surfaces hinged to each other, and the tail cover sealing plate 32j is hinged to 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 before the tail cover 2j is flipped upward to open, which makes the operation cumbersome and affects the efficiency.

[0237] As shown in FIG32 and FIG33 , the fan includes a fan housing 3f, a fan structure and a fan drive.

[0238] The fan structure is mounted within the cylindrical mounting cavity of the fan housing 3f. A first air inlet 31f is provided at each axial end of the fan housing 3f, communicating with the outside world. The first air inlet 31f is circular and concentric with the cross-section of the cylindrical mounting cavity. An air outlet 33f is provided along the axial direction of the sidewall of the fan housing 3f. The width of the air outlet 33f is the same as the width of the mounting cavity. An air guide structure can be installed on the air outlet 33f to direct the air in a desired direction.

[0239] As shown in Figure 32, 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.

[0240] As shown in Figure 33, a wind shield is provided on each first air inlet 31f on both sides. In this embodiment, the wind shield is a plate-shaped structure, and two wind shields are correspondingly provided on each first air inlet 31f. As shown in Figure 33, the two wind shields are respectively a first wind shield 51i provided on the side close to the air outlet 33f and located in the upper half of the first air inlet 31f, and a second wind shield 52i provided on the side away from the air outlet 33f and located in the lower half of the first air inlet 31f. In this embodiment, a communication opening is defined on the housing of the frame 1, corresponding to the first air inlet 31f, for communication with the outside world. The size of the communication opening is the same as that of the first air inlet 31f. Both ends of the fan housing 3f abut against the housing of the frame 1, with the first air inlet 31f directly facing the communication opening. Strip-shaped holes are defined on the first and second wind shields 51i, 52i, respectively, with corresponding mating holes defined on the fan housing 3f and the frame 1. The strip-shaped holes on the first wind shield 51i are horizontally positioned to facilitate the horizontal sliding of the first wind shield 51i and partially shield the upper half of the first air inlet 31f. The strip-shaped holes on the second wind shield 52i are vertically positioned to facilitate the vertical sliding of the second wind shield 52i and partially shield the lower half of the first air inlet 31f. The windshield member can be used to adjust the air intake area of ​​the first air inlet 31f, thereby varying the air intake volume under different operating conditions and providing a wider range of applications.

[0241] As shown in Figure 36, the fan structure includes a fan shaft 1i, several support units, and multiple blades 2i. As shown in Figure 33, both ends of the fan shaft 1i extend beyond the first air inlet 31f and are rotatably secured within a bearing housing on the frame 1. A drive pulley is mounted on one end of the fan shaft 1i, connecting to a drive shaft to provide the rotational drive for the fan structure. In this embodiment, the fan is driven by a belt.

[0242] As shown in Figure 36, the support units are evenly spaced and fixed on the fan shaft 1i, and the fan blades 2i are fixed on the support units. As shown in Figure 34, each support unit includes a plurality of fan 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 fan blades 2i are respectively bolted and fixed on the fan blade brackets 3i.

[0243] In this embodiment, the blade bracket 3i is a plate-like structure, bent to form a fixed section 32i and a mounting section 31i. Within the same support unit, the fixed section 32i of one blade bracket 3i is bolted to the mounting section 31i of another blade bracket 3i. Multiple blade brackets 3i are connected end-to-end to form a polygon circumferentially around the fan shaft 1i, with the polygon circumscribing the circle of the fan shaft 1i's cross section. Bolting multiple blade brackets 3i around the fan shaft 1i creates a simple and stable structure, allowing for quick and easy disassembly and replacement of components.

[0244] All blade supports 3i in any support unit form a regular polygon, and the angle α formed between the fixed segment 32i and the mounting segment 31i is complementary to the interior angle β of the regular polygon. As shown in Figure 34 or Figure 36, in this embodiment, four blade supports 3i are provided in any support unit. The fixed segment 32i and the mounting segment 31i in each blade support 3i are arranged at right angles, and together they form a square with a cross-sectional circle circumscribed by the fan shaft 1i.

[0245] In this embodiment, as shown in Figure 35, a flat groove 11i is provided on the fan shaft 1i corresponding to any supporting unit, and a reinforcing plate 4i is welded in 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. 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 an inability to assemble. In this embodiment, the width of the reinforcing plate 4i is the same as the width of the flat groove 11i. The limitation of the flat groove 11i further avoids the relative sliding between the fan blade bracket 3i and the fan shaft 1i caused by the small clamping force of the fan blade bracket 3i fixed on the fan shaft 1i.

[0246] As shown in Figure 36, in this embodiment, four support units are sequentially spaced apart on the fan shaft 1i. Four fan blades 2i are provided on the two support units on the left side. The fan blades 2i are sheet-like structures, each spanning two support units and bolted to the mounting sections 31i of two fan blade brackets 3i. The fan blades 2i on the two support units on the right side are configured identically to those on the left side, and the specific structure will not be repeated here. The fan blades 2i on the left and right sides form two parallel groups of fan structures, providing more air inlet channels between the two groups, resulting in a large and uniform air supply area.

[0247] 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 in one-to-one correspondence with the fan blade brackets 3i. The fan blade brackets 3i are directly embedded in the flat grooves 11i and bolted end to end in sequence and locked on the fan shaft 1i.

[0248] As shown in Figure 37, the cleaning transmission system includes an output pulley 1s connected to the engine transmission. 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.

[0249] In this embodiment, an intermediate drive shaft 10s is rotatably disposed within two bearing blocks at the front end of the frame 1. An input pulley 11s is secured to one end of the intermediate drive shaft 11s, which is connected to the engine (not shown) on the frame 1 via a main clutch belt. An output pulley 1s is secured to the other end of the harvester's powertrain, including the threshing mechanism, shredding mechanism, winnowing mechanism, grain storage mechanism, residual grain removal mechanism, and screening mechanism. The output pulley 1s is a multi-groove pulley, which can be composed of multiple multi-groove pulleys. The output pulley 1s is secured to one end of the intermediate drive shaft 10s and is adapted to rotate with the intermediate drive shaft 10s. In this embodiment, a V-belt is used to connect the output pulley 1s to the pulleys in the other powertrains. A chain could also be used, but chain transmission is less stable than a V-belt. Furthermore, if the threshing drum becomes clogged, causing the drum cover and other components to rupture, the chain may not break and continue to transmit power, potentially causing component damage. When using V-belt transmission, if the above situation occurs, the V-belt may slip or burn, affecting normal operation. In order to promptly remind the user to stop the machine for cleaning and repair and replacement, it will not cause damage to other components. Therefore, V-belt transmission is preferred.

[0250] As shown in Figure 37, the first transmission path includes an output pulley 1s, a first threshing pulley 2s, and a second threshing pulley 3s. Three C-shaped V-belts connect the output pulley 1s and the first threshing pulley 2s, increasing the overall V-belt cross-section and improving transmission power. A 2HB banded belt connects the first threshing pulley 2s and the second threshing pulley 3s. This banded belt provides a perfect fit with the pulleys, evenly distributing force, and offers excellent transmission stability and impact resistance, making it suitable for the high-intensity working environment of the threshing drum.

[0251] The second transmission path includes the output pulley 1s and the chopper pulley 4s. The chopper is typically located at the rear end of the frame 1, with a larger span between it and the output pulley 1s. Therefore, a first transition pulley 71s is fixed to the frame 1 between the output pulley 1s and the chopper pulley 4s, creating a two-stage transmission. The first transition pulley 71s is rotatably mounted on the frame 1 via a mounting frame and is located on the line connecting the output pulley 1s and the chopper pulley 4s. The first transition pulley 71s utilizes a multi-groove pulley. The output pulley 1s is connected to the first transition pulley 71s, which is in turn connected to the chopper pulley 4s.

[0252] The third transmission path includes the output pulley 1s, fan pulley 51s, seed pulley 52s, waste pulley 53s, and screening pulley 6s. The third transmission path has numerous transmission components and a large transmission span. Therefore, a second transition pulley 72s is included in the third transmission path, similarly split into two stages. The first stage connects the output pulley 1s, fan pulley 51s, seed pulley 52s, second transition pulley 72s, and waste pulley 53s; the second stage connects the second transition pulley 72s and screening pulley 6s. To ensure that the screening pulley 6s rotates in opposite directions to the output pulley 1s, the second transition pulley 72s uses a multi-groove pulley. In the first stage, the outer side of the V-belt contacts the groove surface of the second transition pulley 72s, causing the second transition pulley 72s to rotate in the opposite direction to the output pulley. Consequently, the screening pulley 6s, connected to the second transition pulley 72s, rotates in the opposite direction to the output pulley 1s.

[0253] In this embodiment, a tensioning assembly is installed between adjacent pulleys, as shown in Figure 38. Each tensioning assembly includes a tensioning arm 81s, a tensioning pulley 82s, a pull rod 83s, and a tension spring 84s. In this embodiment, the tensioning arm 81s has a triangular structure, one corner of the triangle being hingedly mounted on the frame 1, and the other two corners being free ends. One free end is rotatably mounted to the tensioning pulley 82s, and a tension spring 84s is disposed between the other free end and the pull rod 83s. The pull rod 83s is fixed to the frame 1, and the tensioning pulley 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. Under normal conditions, the tensioning pulley 82s is tensioned against the V-belt by the biasing force of the tension spring 84s.

[0254] As shown in Figure 39, in this embodiment, a seed auger 521s is horizontally installed at the bottom of the frame 1. One end of the auger is fixed to the seed pulley 52s, and the other end is connected to the silo auger 522s via a reversing gearbox 9s. The silo auger 522s is a vertically operated lifting auger, suitable for lifting grains transported by the seed auger 521s below upward and entering the silo through the upper inlet. The waste auger 531s is horizontally installed at the bottom of the frame 1. One end of the auger is fixed to the waste pulley 53s, and the other end is connected to the re-threshing auger 532s via a reversing gearbox 9s. The re-threshing auger 532s is a vertically inclined lifting auger, suitable for lifting the waste grains transported by the waste auger 531s below upward and into the threshing drum for re-threshing to avoid seed waste. The power for both grain entry and re-threshing is provided by the output pulley 1s, resulting in a simple and compact structure.

[0255] The power inputs of the threshing mechanism, chopping mechanism, winnowing mechanism, grain binning 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.

[0256] As shown in FIGS. 40 and 47, 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. The two 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, only a part of the left side wall 10r and the right side wall 11r are 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 mounted on the moving knife roller 1r. Any moving knife blade 2r is parallel to the cross-section of the moving knife roller 1r.

[0257] As shown in FIG. 42, a plurality of moving knife seats 5r are welded and fixed to the moving knife roller 1r. The moving knife blades 2r are correspondingly and fixedly mounted 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 mounting cavity of the moving knife seat 5r.

[0258] As shown in FIG. 43, in the square structure obtained by unfolding and laying flat the moving knife roller 1r along one of its cylindrical generatrices, in the length direction, a plurality of moving knife seats 5r are arranged in rows and obliquely. As shown in FIG. 43, six moving knife seats 5r form a row, and are arranged at intervals obliquely 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 shown in FIG. 43, 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 arranged obliquely 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 arranged in a staggered manner, 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 cross row by row. The distribution state on the moving knife roller 1r is as shown in FIG. 44, making the orthographic projection 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 shown in FIG. 45. 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.

[0259] The fixed blade seat 3r is arranged obliquely below the movable blade roller 1r, as shown in Figure 41, and multiple fixed blades 4r are arranged on the fixed blade seat 3r in the same direction and evenly spaced. A row of movable blades 2r passes between two adjacent fixed blades 4r. For example, in Figure 43, the first row of movable blades 2r are the movable blades 2r on the first movable blade seat 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 seat 5r from the left in the second and fourth rows, and so on.

[0260] When the movable blade roller 1r is driven to rotate, it drives the movable blades 2r to rotate through the gaps between the fixed blades 4r. The movable blades 2r are arranged in a spiral pattern on the surface of the movable blade roller 1r. This ensures that at any rotational position of the movable blade roller 1r, a movable blade 2r can pass through the gaps between the fixed blades 4r. This ensures that the cutting state between the movable blades 2r and the fixed blades 4r is always maintained. This improves shredding efficiency even at the standard rotational speed of the movable blade roller 1r, reduces the power output costs associated with increasing the rotational speed, and avoids the safety risks associated with the dynamic balance being disrupted by increasing the rotational speed.

[0261] As shown in Figure 46, the anti-entanglement ring K is mounted on the bearing seats at both ends of the movable blade roller 1r and fixed to the left and right walls 10r and 11r. As shown in Figure 46, each anti-entanglement ring K comprises at least two ring plates 1k and at least two retaining plates 2k. The ring plates 1k are each arc-shaped, with all the ring plates 1k connected end to end to form a circular isolation zone. At least two retaining plates 2k are fixed to one of the two connected ring plates 1k, forming a slot 3k between the ring plate 1k and the other ring plate 1k; the other ring plate 1k is adapted to be inserted and fixed in the slot 3k.

[0262] In this embodiment, as shown in Figure 46, 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.

[0263] In this embodiment, two ring plates 1k are provided, each shaped like a semicircular arc. The outer wall of one ring plate 1k fits against the inner wall of the other. Holes are punched through the two stacked base plates 11k, allowing the two ring plates 1k to be bolted together. The base plates 11k also have several mounting holes 5k sized for conventional bolts, which pass through these holes to secure the anti-entanglement ring to the left and right walls 10r and 11r. Alternatively, three or four ring plates 1k can be provided, connected end-to-end in sequence to form a circular isolation zone. The specific number of ring plates 1k depends on the specific situation.

[0264] 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.

[0265] As shown in Figure 46, the base plate 11k also features at least one clearing opening for observation or access to other equipment. In this embodiment, the clearing opening is a clearing slot 4k formed by recessing the inner edge of the arc-shaped base plate 11k toward the outer edge. The clearing slot 4k is an isosceles trapezoidal shape, with the opening wider than the bottom. The slot is located on the inner ring of the base plate 11k. The anti-entanglement ring of the base plate 11k forms a hole for securement on the bearing seat. Therefore, the slot engages the surface of the bearing seat. The large size of the slot facilitates internal observation. In this embodiment, two clearing slots 4k are provided on the base plate 11k of each ring plate 1k, with the four clearing slots 4k evenly spaced around the circumference.

[0266] The ring plate 1k forms a circular isolation area, which is suitable for being fixed on the driving shaft and blocked in the gap to prevent weeds or straw from being entangled on the driving shaft.

[0267] As shown in Figures 47 and 48, the spreading structure includes a grass separating plate 1p, multiple first grass guide plates 2p, and multiple second grass guide plates 3p. As shown in Figure 48, an extension section 11p is provided on the grass separating plate 1p. The width of the extension section 11p is the same as the width of the grass discharge opening 10p. The edge of the extension section 11p is flanged and fixed to the upper edge of the grass discharge opening 10p. The grass separating plate 1p is tilted downward as a whole.

[0268] The surface of the grass-dividing plate 1p is gradually enlarged from its extension section 11p toward 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 this embodiment, three first grass guide plates 2p are provided, which are arranged at different angles on the grass-dividing plate 1p, 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, and the first grass guide plates 2p are symmetrically arranged about the center line of the grass-dividing plate 1p.

[0269] As shown in Figure 48, a plurality of second grass guide plates 3p are provided on the grass dividing plate 1p at one end away from the grass discharge port 10p. The second grass guide plates 3p 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. Similarly, the second grass guide plates 3p are perpendicular to the grass dividing plate 1p and are arranged at an angle to the center line of the grass dividing plate 1p. In this embodiment, the number of second grass guide plates 3p is greater than the number of first grass guide plates 2p. For example, seven second grass guide plates 3p are provided, 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 plates 3p and the center line of the grass dividing plate 1p gradually increases from the second grass guide plates 3p closer to the center line of the grass dividing plate 1p to the second grass guide plates 3p farther from the center line of the grass dividing plate 1p. In this embodiment, except for the second grass guide plates 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. 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 through 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 accumulation in a straight line in the field, thereby improving the spreading efficiency.

[0270] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A combine harvester, characterized in that: include: A vehicle frame (2), 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-helix threshing and conveying system having an "X"-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.

2. The combine harvester according to claim 1, characterized in that The double-helix threshing and conveying system comprises: Two concave plate screens are arranged horizontally, parallel and spaced apart, on a frame (1); the inner screen surface of any of the concave plate screens is arc-shaped; 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 communicate with each other; A transition plate screen (7b) is laid between the two concave plate screens and connects 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 cylinder covers are corresponding to each other and buckled onto the concave plate screen, forming a hollow cylindrical installation cavity between the cylinder covers and the concave plate screen; a plurality of guide members are provided at intervals on the wall surface of each cylinder 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 cylinder covers are opposite; Two rollers are coaxially and rotatably arranged in the installation cavity; gaps are set 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 length.

3. The combine harvester according to claim 2, characterized in that It also includes a position limiting 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).

4. The combine harvester according to claim 3, characterized in that: The limit adjustment structure also includes: 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 (10b); the two sides of the sealing plate (9b) are respectively fixed on the two adjusting members.

5. The combine harvester according to claim 4, characterized in that Any of the adjusting members includes: The adjusting plate (91b), the plate surface of which is in an arc shape matching the concave sieve plate it is fixed to; the plate surface of the adjusting plate (91b) is adapted to partially block the transition port (6b); Two mounting plates (92b), which are arranged along the bending of 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 sieve plate, and the other mounting plate (92b) is adapted to be fixedly connected to the sealing plate (9b).

6. The combine harvester according to claim 5, characterized in that The cross-section of the adjusting member is in a U shape.

7. The combine harvester according to claim 2, characterized in that: The sieve surface of the transition sieve plate (7b) is tangent to the inner sieve surface of the concave sieve plate that first contacts the crop.

8. The combine harvester according to claim 2, 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 sieve plate; The cover body (21c) includes an arc-shaped top cover (211c) and side top plates (212c) blocking 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.

9. The combine harvester according to claim 2, 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.

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

11. The combine harvester according to claim 10, characterized in that The lifting structure is a vibrating sieve; the vibrating sieve includes: A mounting member, which has an assembly surface (12d) and a side opposite to the assembly surface (12d), and an installation surface (11d) 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 sieve teeth (2d), which extend along the opening direction of the angle formed by the assembly surface (12d) and the installation surface (11d), and one end is a fixed end, which is fixed at intervals on the installation surface (11d), and the other end is a free end, which is suspended.

12. The combine harvester according to claim 11, characterized in that Any one of the sieve teeth (2d) is arranged in a stepped bending manner; it is adapted to guide the crop to travel along the sieve teeth (2d) from the fixed end located on the installation surface (11d) to the free end. It should be noted that the term "拨动件" in the original text needs to be further clarified or replaced with a more specific and accurate term for a more precise translation. Here, it is directly translated as "拨动件" for the time.

13. The combine harvester according to claim 10, wherein: The front sealing structure comprises: a sealing member 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 spaced apart from each other.

14. The combine harvester according to claim 13, wherein: The front sealing structure further 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).

15. The combine harvester according to claim 14, characterized in that The front sealing structure further 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).

16. The combine harvester according to claim 10, wherein: The seed separation structure comprises: an isolating member, arranged between the seed collecting area (M) and the debris collecting area (N), and fixed on the screen frame (1h); an isolating surface of the isolating member extends from one side of the seed collecting area (M) to above the debris collecting area (N); A front curtain (3e) extends in the same direction as the isolation surface, with one end fixed to the isolation member and the other end resting on the seed bottom shell (5e) in the seed collection area (M); and is suitable for shielding an opening formed between the isolation member and the seed bottom shell (5e) and communicating with the seed collection area (M) and the debris collection area (N).

17. The combine harvester according to claim 16, wherein: The seed separation structure further comprises: A rear curtain (4e) is arranged at an angle to the isolation surface, with one end fixed to 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 an opening formed between the isolation member and the debris bottom shell (6e) and communicating with the debris collection area (N) and the grain collection area (M).

18. The combine harvester according to claim 10, wherein: The driving structure includes: 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 fixed in the outer spherical bearings; 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 driver of the harvester and driving the transmission shaft (3g) to rotate.

19. The combine harvester according to claim 18, 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 vibrating rails (62g) are symmetrically arranged on the frame (1) on both sides of the screen frame (1h); the guiding direction of the vibrating rails (62g) is arranged at an angle to the horizontal plane; and the rail bearings (61g) are slidably arranged in the vibrating rails (62g) in a one-to-one correspondence.

20. The combine harvester according to claim 1, wherein 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 flow blocking member (3j) is provided between the tail cover (2j) and the vibrating screen to guide the supplied air 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 grain 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 to gradually increase in height; The fan housing (3f) has a cylindrical installation cavity; The fan housing (3f) is provided with first air inlets (31f) communicating with the outside world at both ends in the axial direction; A second air inlet (32f) is provided on the side wall of the fan housing (3f) opposite to the air outlet (33f) along its circumference; in the axial direction of the fan housing (3f), the second air inlet (32f) is located in the middle of the fan housing (3f).

21. The combine harvester according to claim 1, wherein: The cleaning transmission system includes: An output pulley (1s) connected to the engine transmission; the output pulley (1s) is divided into three transmission outputs; the three transmissions are distributed on the same side wall of the frame (1); The first transmission path includes 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 grain pulley (52s), a miscellaneous pulley (53s) and a screening pulley (6s); all the pulleys are connected in a transmission manner.

22. The combine harvester according to claim 21, wherein: 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).

23. The combine harvester according to claim 21, wherein: 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; the second transition wheel (72s) is transmission-connected to the screening pulley (6s).

24. The combine harvester according to claim 21, wherein: The three-way transmission all adopts V-belt transmission connection.

25. The combine harvester according to claim 24, wherein: The first threshing pulley (2s) and the second threshing pulley (3s) are connected via a combined belt transmission.

26. The combine harvester according to claim 24, wherein: The invention also includes a plurality of tensioning assemblies distributed between adjacent pulleys and suitable for tensioning the V-belts between the adjacent pulleys.

27. The combine harvester according to claim 26, wherein: Any of the tensioning assemblies includes: A tensioning arm (81s), one end of which is hingedly mounted 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 provided between the pull rod (83s) and the tensioning arm (81s); The tension wheel (82s) is tensioned and abutted against the V-belt by the biasing force of the tension spring (84s).

28. The combine harvester according to claim 21, wherein: A grain auger (521s) is installed on the frame (1), with a grain pulley (52s) fixed at one end and a grain silo auger (522s) connected at the other end; a direction-changing gear box (9s) is provided between the grain auger (521s) and the grain silo auger (522s).

29. The combine harvester according to claim 21, wherein: A miscellaneous auger (531s) is passed through the frame (1), with a miscellaneous pulley (53s) fixed at one end and a re-detaching auger (532s) connected at the other end; a direction-changing gearbox (9s) is provided between the miscellaneous auger (531s) and the re-detaching auger (532s).

30. The combine harvester according to claim 1, wherein: The distribution structure includes: Grass separation plate (1p), fixed on the upper edge of the grass discharge port (10p); The board surface of the grass separating 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).

31. The combine harvester according to claim 30, wherein: 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 separating plate (1p) in a direction parallel to the edge of the grass discharge port (10p) and located at an end away from the grass discharge port (10p); the second grass guide plates (3p) are perpendicular to the grass separating plate (1p) and are arranged at an angle to the center line of the grass separating plate (1p); The number of the second grass guide plates (3p) is greater than the number of the first grass guide plates (2p).