Screening system and combine harvester

Abstract

The application provides a screening system and a combine harvester. 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 zone and a lower screen (8d) zone. In the upper screen zone, a lifting structure is arranged on the tail end of a corrugated plate (6d) to improve the drop between the corrugated plate (6d) and a fish scale screen (7d), and two stages of lifting are formed by cooperating with a tail screen (2h) at the tail end, so as to fully shake and loosen the accumulated crops and avoid the waste caused by the discharge of grains carried by crop straw. At the same time, the front sealing structure is arranged on a front end of the corrugated plate (6d) to prevent the grains from being thrown away by the vibrating screen (H). The grain separation structure is arranged between a grain collection zone (M) and a debris collection zone (N) under the vibrating screen (H) to effectively separate the clean grains and the debris, such as straw, so that the collection of the grains is more complete and cleaner, waste is prevented and the screening efficiency is improved. Drawing accompanying abstract: Fig. 1.

Description

Screening system and combine harvester Technical Field

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

[0002] The threshing system of crawler combine harvester 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] In the screening area of ​​an existing combine harvester, crop grains and impurities such as straw are separated and screened through the reciprocating vibration of a vibrating screen. The vibrating screen vibrates reciprocatingly along an elliptical vibration trajectory. Although the front corrugated plate in the vibrating screen is tilted downward toward the rear end of the harvester to guide the movement of the crops, the horizontal vibration component of the vibrating screen will still cause grains to fly out from the front end of the vibrating screen.

[0004] In the prior art, a canvas is set at the front end of the vibrating screen for shielding, but the vibrating screen is in a continuous working state. In order to adapt to the amplitude of the vibrating screen, the canvas needs to have sufficient stretching margin and cannot be fixed. Therefore, there will be gaps between the canvas and the vibrating screen, as well as between the left and right side walls of the frame. The gap will also expand from time to time during the vibration process, causing crop grains to leak out and fall from the front end of the frame to the ground, which cannot be collected and causes waste.

[0005] At the same time, the grain collection area and the debris collection area below the vibrating screen are not completely separated, which makes it easy for straw and other debris to mix into the grains, affecting the cleanliness of the grains.

[0006] The corrugated plate is tilted downward toward the tail end of the harvester, and the height difference between it and the adjacent fish-scale screen is small. At the same time, the up and down height difference of the elliptical vibration trajectory of the vibrating screen is small, which together result in the crop not being fully lifted and loosened in the vibrating screen, causing the crop straw to clumping and being discharged with the grains, resulting in waste.

[0007] Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present application is to overcome the low screening efficiency of the harvester screening system in the prior art, which easily causes waste of resources.

[0009] According to one aspect of the present application, a screening system is proposed, comprising:

[0010] A vibrating screen having an upper screen area and a lower screen area; the screen frame of the vibrating screen is generally funnel-shaped;

[0011] The upper screen area is provided with a corrugated plate, a lifting structure, at least one section of fish scale screen and a tail screen in sequence along the crop moving direction;

[0012] A lower screen is provided in the lower screen area corresponding to the fish scale screen;

[0013] A front sealing structure, sealed and fixed to the front end of the corrugated plate;

[0014] A grain separation structure is provided at the end of the lower screen and spans between the grain collection area and the debris collection area;

[0015] The driving structure is fixed on the frame and is suitable for driving the vibrating screen to vibrate reciprocatingly.

[0016] Preferably, the fish scale screen is arranged in two sections at intervals along the horizontal direction; the fish scale screen sheets in the two sections of the fish scale screen are arranged at an angle.

[0017] Preferably, the tail screen comprises:

[0018] A mounting seat is arranged obliquely in the same direction as the adjacent fish scale screen piece and fixed on the screen frame;

[0019] A plurality of tail screen pieces are extended obliquely upward from the mounting seat in the crop moving direction and fixed on the mounting seat at even intervals in the horizontal direction.

[0020] Preferably, the screen frame includes a rear slide plate arranged corresponding to the tail screen and an adjustment plate slidably arranged along the plate surface of the rear slide plate.

[0021] Preferably, the lifting structure is a shaking screen; the shaking screen comprises:

[0022] 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;

[0023] 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.

[0024] Preferably, any of the screen teeth is bent in a stepped manner, suitable for guiding the crops to move along the screen teeth from the fixed end located on the mounting surface to the free end.

[0025] Preferably, the front sealing structure comprises:

[0026] 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;

[0027] 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.

[0028] Preferably, the gaps between the two side edges of the sealing member and the left and right side walls of the frame are filled with sealant.

[0029] Preferably, the front sealing structure further includes:

[0030] 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.

[0031] Preferably, the front sealing structure further includes:

[0032] The second shielding member has one end fixed to the 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.

[0033] Preferably, the grain separation structure comprises:

[0034] 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;

[0035] 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.

[0036] Preferably, the grain separation structure further comprises:

[0037] 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.

[0038] Preferably, the driving structure includes:

[0039] 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;

[0040] A transmission shaft, both ends of which are fixed in the outer spherical bearings;

[0041] Two eccentric bearings are fixed at both ends of the transmission shaft in a mirror-image manner;

[0042] 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;

[0043] 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.

[0044] Preferably, the reciprocating guide structure comprises:

[0045] Two track bearings are symmetrically arranged on both sides of the screen frame and away from one end of the transmission shaft;

[0046] 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.

[0047] Preferably, the driving structure further includes:

[0048] A protective plate is fixed to the support beam on one side of the driving wheel; the plate surface of the protective plate is extended along the radial direction of the transmission shaft;

[0049] The area of ​​the protective plate is larger than the cross-sectional area of ​​the driving wheel.

[0050] According to another aspect of the present application, a combine harvester is provided, comprising the screening system described above.

[0051] The technical solution of this application has the following advantages:

[0052] 1. The screening system provided in the present application includes a vibrating screen, a front sealing structure, a grain separation structure and a driving structure. The vibrating screen has an upper screening area and a lower screening area. A lifting structure is set at the tail end of the corrugated plate in the upper screening area to increase the drop between the corrugated plate and the fish scale screen, and cooperate with the tail screen at the tail end to form a two-stage lifting structure, which can fully shake out the agglomerated crops and prevent 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 to prevent the grains from being thrown out by the vibrating screen. A grain separation structure is set between the grain collection area and the debris collection area below the vibrating screen to effectively separate the clean grains from the straw and other debris, so that the grain collection is more complete and cleaner, avoiding waste and improving the screening efficiency.

[0053] 2. The screening system provided by the present application has a lifting structure of a shaking screen, which includes a mounting member and a plurality of screen teeth. 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 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 fixed at intervals on the mounting surface, and the other end is a free end, which 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.

[0054] 3. The screening system provided in this application includes 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 grain collection area below the vibrating screen, thereby preventing crop grains from flying out of the opening and falling to the ground, causing waste.

[0055] 4. The screening system provided in the present application, the grain separation structure includes an isolator and a front curtain, which are arranged between the grain collection area and the debris collection area and fixed on the shell of the vibrating screen. The isolation surface of the isolator extends from one side of the grain collection area to above the debris collection area, and the front curtain extends in the same direction as the isolation surface, one end is fixed on the isolator, and the other end is placed on the grain bottom shell in the grain collection area to block the opening formed between the isolator and the grain bottom shell connecting the grain collection area and the debris collection area, so that the fan blows air along the front curtain and the isolator and blows out from the opening formed between the isolator and the lower screen, avoiding the return air from carrying debris into the grain collection 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.

[0056] 5. The screening system provided in the present application has a driving structure including two bearing seats, a transmission shaft, two eccentric bearings and a driving wheel. The two bearing seats are respectively fixed on the side wall surfaces of the two symmetrical support beams at the rear end of the frame. An outer spherical bearing is installed in any bearing seat, and both ends of the transmission shaft are respectively fixed in the outer spherical bearings. The two eccentric bearings are fixed at both ends of the transmission shaft in a mirror image. One end of the vibrating screen is fixed on the two eccentric bearings, and the other end is arranged on the frame through a reciprocating guide structure. The driving wheel is fixed on one end of the transmission shaft and is suitable for being driven by the harvester's driver and driving the transmission shaft to rotate. The bearing seat is directly fixed on the support beam of the frame to avoid transitional connection, and the gravity of the vibrating screen and the inertial force of its reciprocating motion are directly borne by the frame, so that the vibration of the vibrating screen is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] 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.

[0058] FIG1 is a schematic structural diagram of a screening system according to an embodiment of the present application;

[0059] FIG2 is a schematic structural diagram of a shaking screen in an embodiment of the present application;

[0060] FIG3 is a schematic structural diagram of a mounting plate in an embodiment of the present application;

[0061] FIG4 is a schematic structural diagram of a sieve fork assembly according to an embodiment of the present application;

[0062] FIG5 is a schematic diagram of the assembly structure of the shaking screen in an embodiment of the present application;

[0063] FIG6 is a schematic diagram of the sealing plate installation structure according to an embodiment of the present application;

[0064] FIG7 is a schematic structural diagram of a front sealing structure in an embodiment of the present application;

[0065] FIG8 is a schematic structural diagram of a grain separation structure in an embodiment of the present application;

[0066] FIG9 is a schematic structural diagram of an isolating member according to an embodiment of the present application;

[0067] FIG10 is a structural diagram of a vibrating screen drive according to an embodiment of the present application;

[0068] FIG11 is a second structural diagram of a vibrating screen drive according to an embodiment of the present application;

[0069] FIG12 is a schematic structural diagram of a track bearing on a vibrating screen according to an embodiment of the present application;

[0070] FIG13 is a schematic structural diagram of a vibration guide rail according to an embodiment of the present application;

[0071] FIG14 is a schematic structural diagram of the linkage member in an embodiment of the present application.

[0072] Description of reference numerals:

[0073] H, vibrating screen; M, grain collection area; N, debris collection area;

[0074] 1. Frame; 12b. Support beam;

[0075] 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;

[0076] 1e, partition plate; 11e, flange; 2e, connecting plate; 3e, front curtain; 4e, rear curtain; 5e, seed bottom shell; 6e, miscellaneous bottom shell;

[0077] 1f, sealing plate; 2f, front material plate; 3f, fan housing; 4f, visual component; 5f, screen front plate; 6f, first shielding member; 7f, second shielding member; 8f, butterfly nut;

[0078] 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;

[0079] 1h, screen frame; 11h, rear slide; 12h, adjustment plate; 2h, tail screen; 21h, mounting seat; 22h, tail screen piece. DETAILED DESCRIPTION

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Example 1

[0085] This embodiment provides a screening system, as shown in Figures 1, 5, 11 and 12, comprising a vibrating screen H, a front sealing structure, a grain separation structure and a drive structure. The vibrating screen H has an upper screening area and a lower screening area 8d. A lifting structure is provided at the tail end of the corrugated plate 6d in the upper screening area to increase the height difference between the corrugated plate 6d and the fish scale screen 7d. Together 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 during discharge, causing waste. At the same time, a front sealing structure is provided 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 provided between the grain collection area M and the debris collection area N below the vibrating screen H to effectively separate the clean grains from debris such as straw, making the collection of grains more complete and cleaner, avoiding waste and improving screening efficiency.

[0086] As shown in Figures 1 and 5, the screen frame 1h of the vibrating screen H is generally funnel-shaped. 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. A lower screen 8d is provided in the lower screen 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 scale screens in the two sections of the fish-scale screen 7d are arranged at an angle. For example, the scale screens on the first section of the fish-scale screen 7d near the corrugated plate 6d are arranged vertically upward, while the 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.

[0087] As shown in Figure 5, 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.

[0088] As shown in Fig. 2, the vibrating sieve includes a mounting member and multiple sieve teeth 2d. In this embodiment, the mounting member is a plate-like structure, i.e., 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. 3, 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. 5, when the vibrating 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 vibrating sieve and is shaken up by the suspended sieve teeth 2d, and then falls onto the fish-scale sieve 7d, realizing shaking and loosening of the crop. In addition, the vibrating 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.

[0089] As shown in Fig. 4, 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 manner and is adapted to guide the crop to travel along the sieve tooth 2d from the fixed end located on the mounting surface 11d to the free end. The fixed ends of 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. Multiple said sieve fork groups 4d are evenly spaced on the mounting surface 11d. As shown in Fig. 2, all sieve fork groups 4d are pressed and welded to the mounting surface 11d of the mounting plate 1d through a pressing plate 5d. The suspended length of each sieve tooth 2d is relatively long. On the one hand, it can increase the height of the crop falling onto the fish-scale sieve 7d, and on the other hand, it can improve the elasticity of the sieve teeth 2d, making the shaking effect more obvious when it moves with the vibrating sieve.

[0090] In this embodiment, the mounting plate 1d, the sieve teeth 2d, and the pressing plate 5d are all made of aluminum alloy material to reduce the weight of the entire screening system, thereby reducing the vibration inertia.

[0091] A front material plate 2f for guiding the crop seeds to slide down is arranged below the threshing cylinder. One end of the front material plate 2f is fixed to the front end of the frame 1, and the plate surface is inclined downward from the front end of the frame 1 to the tail of the frame 1. The other end of the front material plate 2f is located above the vibrating sieve H and within the orthographic projection of the vibrating sieve H on the horizontal plane.

[0092] As shown in Figure 6, 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 seal's two opposite sides 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.

[0093] In this embodiment, as shown in Figures 6 or 7 , 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 6 , 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.

[0094] 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.

[0095] 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 FIG7 . One end of the first shielding member 6f is fixed to the front material plate 2f, located above the vibrating screen H. The other end of the first shielding member 6f 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.

[0096] As shown in Figure 7, a second shielding member 7f is fixed to 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 front and behind.

[0097] In this embodiment, both the first shielding member 6f and the second shielding member 7f are made of canvas.

[0098] As shown in FIG. 8, the grain separation structure includes a separator and a front baffle 3e. As shown in FIG. 1, 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.

[0099] In this embodiment, as shown in FIG. 8, 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 plates 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 baffle 3e extends in the same direction as the plate surface of the partition plate 1e, with one end fixed to the partition plate 1e and the other end resting 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 baffle 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.

[0100] The front baffle 3e is a rubber baffle or a canvas baffle. In this embodiment, the front baffle 3e is a rubber baffle. As shown in FIG. 8 or FIG. 1, a part of the rubber baffle rests on the grain bottom shell 5e and naturally hangs down along the surface of the grain bottom shell 5e. The rubber baffle in contact with the grain bottom shell 5e has a certain adhesion force, which can better prevent the baffle from being blown up by the fan.

[0101] As shown in FIG. 8, a rear baffle 4e is also provided in the tailings collection area N. One end of the rear baffle 4e is fixed to the partition plate 1e, and the other end rests on the tailings bottom shell 6e in the tailings collection area N, further preventing the return air from lifting the front baffle 3e and causing tailings to enter the grain collection area M. The width of the rear baffle 4e is less than the straight-line distance from its fixing point on the partition plate 1e to the auger in the tailings collection area N, avoiding entanglement with the rear baffle 4e during the rotation of the auger and causing a failure. Similarly, the rear baffle 4e is a rubber baffle or a canvas baffle. In this embodiment, the rear baffle 4e is a rubber baffle. As shown in FIG. 8 or FIG. 1, a part of the rubber baffle rests on the tailings bottom shell 6e and naturally hangs down along the surface of the tailings bottom shell 6e. The rubber baffle in contact with the tailings bottom shell 6e has a certain adhesion force, which can better prevent the baffle from being blown up by the return air swirling along the inner wall surface of the tailings bottom shell 6e.

[0102] 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.

[0103] As shown in Figure 9, 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 angle between flange 11e and the surface of the partition plate 1e is obtuse. 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 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.

[0104] As an alternative implementation of this embodiment, the rear curtain 4e may not be provided, and only the front curtain 3e may be provided.

[0105] As shown in Figure 10, 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.

[0106] As shown in Figure 10, two bearing seats 2g are respectively 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 respectively fixed in the outer spherical bearings. Two eccentric bearings 4g are fixed to the ends of the drive shaft 3g in a mirror image. 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 to rotate. 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.

[0107] The reciprocating guide structure includes two track bearings 61g and vibration tracks 62g corresponding to the two track bearings 61g. As shown in FIG12 , 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 FIG13 , 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.

[0108] A linkage member 7g is provided between the vibrating screen H and the eccentric bearing 4g. As shown in Figure 14, 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.

[0109] As shown in Figures 10 and 11 , 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 is 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.

[0110] As shown in Figure 10 or Figure 11, 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 is used to avoid excessive reciprocating vibration of the vibrating screen H, thereby ensuring the balance of the overall vibration of the vibrating screen H.

[0111] Example 2

[0112] This embodiment provides a combine harvester, including the screening system in Example 1.

[0113] 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 screening system, characterized in that: include: A vibrating screen (H) having an upper screen area and a lower screen area (8d); the screen frame (1h) of the vibrating screen (H) is generally funnel-shaped; The upper screen area is provided with a corrugated plate (6d), a lifting structure, at least one section of fish scale screen (7d) and a tail screen (2h) in sequence along the crop moving direction; A lower screen (8d) is provided in the lower screen (8d) area corresponding to the fish scale screen (7d); A front sealing structure, sealed and fixed at the front end of the corrugated plate (6d); A grain separation structure is provided at the end of the lower screen (8d) and spans between the grain collection area (M) and the debris collection area (N); The driving structure is fixed on the frame (1) and is suitable for driving the vibrating screen (H) to vibrate back and forth.

2. The screening system according to claim 1, wherein: The fish scale screen (7d) is arranged in two sections at intervals along the horizontal direction; the fish scale screen pieces in the two sections of the fish scale screen (7d) are arranged at an angle.

3. The screening system according to claim 2, characterized in that The tail sieve (2h) comprises: A mounting seat (21h) is arranged to be inclined in the same direction as the adjacent fish scale screen piece and is fixed on the screen frame (1h); A plurality of tail screen (2h) pieces are extended obliquely upward from the mounting seat (21h) in the direction of crop movement and are fixed on the mounting seat (21h) at even intervals in the horizontal direction.

4. The screening system according to claim 1, wherein: The screen frame (1h) comprises a rear slide plate (11h) arranged corresponding to the tail screen (2h) and an adjustment plate (12h) slidably arranged along the plate surface of the rear slide plate (11h).

5. The screening system according to any one of claims 1 to 4, characterized in that The lifting structure is a shaking screen; the shaking screen comprises: The mounting member comprises an assembly surface (12d) and an assembly surface (11d) facing away from the assembly surface (12d) and arranged at an acute angle to the assembly surface (12d); the assembly surface (12d) is fixed to the tail end of the corrugated plate (6d); A plurality of screen teeth (2d) extend along the opening direction of the angle formed by the assembly surface (12d) and the installation surface (11d), with one end being a fixed end fixed at intervals on the installation surface (11d), and the other end being a free end and being suspended.

6. The screening system according to claim 5, characterized in that Any of the sieve teeth (2d) is bent in a stepped manner and is suitable for guiding crops to move along the sieve teeth (2d) from a fixed end located on the mounting surface (11d) to a free end.

7. The screening system according to any one of claims 1 to 4, characterized in that 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); The 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.

8. The screening system according to claim 7, characterized in that The gaps between the two side edges of the sealing member and the left and right side walls of the frame (1) are filled with sealant.

9. The screening system according to claim 7, 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).

10. The screening system according to claim 7, wherein: 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).

11. The screening system according to any one of claims 1 to 4, characterized in that 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).

12. The screening system according to claim 11, 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).

13. The screening system according to any one of claims 1 to 4, characterized in that 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.

14. The screening system according to claim 13, wherein: 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.

15. The screening system according to claim 14, wherein: The driving structure further includes: A protective plate (9g) is fixed on the support beam (12b) on one side of the driving wheel (5g); the plate surface of the protective plate (9g) is extended along the radial direction of the transmission shaft (3g); The area of ​​the protective plate (9g) is larger than the cross-sectional area of ​​the driving wheel (5g).

16. A combine harvester, characterized in that: A screening system comprising the screening system of any one of claims 1-15.