Screening system and combine harvester

Abstract

The present invention provides a screening system and a combine harvester, including 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 arranged 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 agglomerated crops, and avoid the discharge of grains entrained by the crop straw, causing waste. At the same time, a front sealing structure is arranged at the front end of the corrugated plate to prevent the grains from being thrown out by the vibrating screen. A grain separation structure is arranged between the grain collection area and the debris collection area below the vibrating screen to effectively separate the clean grains from the debris such as straw, so that the grains can be collected more completely and cleanly, waste can be avoided, and the screening efficiency can be improved.

Description

Technical Field

[0001] The invention 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 forms of threshing and cleaning system are the main structural forms currently used in the market.

[0003] In the screening area of ​​the existing combine harvester, crop grains and impurities such as straw are separated and screened through the reciprocating vibration of the vibrating screen. The vibrating screen reciprocates in 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 vibration component of the vibrating screen in the horizontal direction 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. However, 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 stretch 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 rear end of the harvester, with a small height difference between the corrugated plate and the adjacent fish-scale screen. 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 inability to fully lift, shake and loosen the crops in the vibrating screen, causing the crop straw to clumping and be discharged with the grains, resulting in waste. Summary of the invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the low screening efficiency of the harvester screening system in the prior art, which easily causes waste of resources.

[0008] To this end, the present invention proposes a screening system, comprising:

[0009] A vibrating screen having an upper screen area and a lower screen area; the screen frame of the vibrating screen is in a funnel-shaped structure as a whole;

[0010] 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;

[0011] A lower screen is arranged in the lower screen area corresponding to the fish scale screen;

[0012] A front sealing structure, sealed and fixed at the front end of the corrugated plate;

[0013] A grain separation structure is arranged at the end of the lower screen and spans between the grain collection area and the debris collection area;

[0014] The driving structure is fixed on the frame and is suitable for driving the vibrating screen to vibrate reciprocatingly.

[0015] 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.

[0016] The tail screen comprises:

[0017] A mounting seat is arranged in the same direction as the adjacent fish scale screen and is fixed on the screen frame;

[0018] A plurality of tail screen plates 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.

[0019] The screen frame comprises 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.

[0020] The lifting structure is a shaking screen; the shaking screen comprises:

[0021] The mounting member comprises a mounting surface and a mounting surface which is opposite to the mounting surface and is arranged at an acute angle to the mounting surface; the mounting surface is fixed to the rear end of the corrugated plate;

[0022] A plurality of screen teeth extend along the opening direction of the angle formed by the assembly surface and the mounting surface, and one end is a fixed end fixed on the mounting surface at intervals, and the other end is a free end and is suspended.

[0023] Any of the screen teeth is bent in a step-like manner, and is suitable for guiding the crops to move along the screen teeth from the fixed end located on the mounting surface to the free end.

[0024] The front sealing structure comprises:

[0025] 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;

[0026] Two opposite sides of the sealing member in the width direction correspond to the left and right side walls of the frame and are arranged with a gap therebetween.

[0027] 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.

[0028] The front sealing structure also includes:

[0029] The first shielding member is arranged between the front material plate and the screen front plate of the vibrating screen; the first shielding member is a flexible member having an extension margin for the reciprocating vibration of the vibrating screen.

[0030] The front sealing structure also includes:

[0031] A second shielding member has one end fixed to one end of the front material plate facing the vibrating screen, and the other end is a free end and naturally hangs down to the screen surface of the vibrating screen.

[0032] The seed separation structure comprises:

[0033] An isolating member is disposed between the seed collection area and the debris collection area and fixed on the screen frame; an isolating surface of the isolating member extends from one side of the seed collection area to above the debris collection area;

[0034] A front curtain extends in the same direction as the isolation surface, with one end fixed on the isolation member and the other end mounted on the seed bottom shell in the seed collection area; it is suitable for covering the opening formed between the isolation member and the seed bottom shell connecting the seed collection area and the debris collection area.

[0035] The seed separation structure further comprises:

[0036] 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.

[0037] The driving structure comprises:

[0038] Two bearing seats are respectively fixed on the side walls of two symmetrical and vertically arranged support beams at the rear end of the frame; an outer spherical bearing is installed in any of the bearing seats;

[0039] A transmission shaft, both ends of which are respectively fixed in the outer spherical bearings;

[0040] Two eccentric bearings are fixed at both ends of the transmission shaft in a mirror image;

[0041] 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;

[0042] The driving wheel is fixed on one end of the transmission shaft and is suitable for being driven by a driver of the harvester and driving the transmission shaft to rotate.

[0043] The reciprocating guide structure comprises:

[0044] Two track bearings are symmetrically arranged on both sides of the screen frame and away from one end of the transmission shaft;

[0045] Two vibration tracks are symmetrically arranged on the frames on both sides of the screen frame; the guiding direction of the vibration track is arranged at an angle with the horizontal plane; the track bearings are slidably arranged in the vibration track in one-to-one correspondence.

[0046] The driving structure further includes:

[0047] A protective plate is fixed on the support beam at one side of the driving wheel; the plate surface of the protective plate is extended along the radial direction of the transmission shaft;

[0048] The area of ​​the protection plate is larger than the cross-sectional area of ​​the driving wheel.

[0049] The present invention provides a combine harvester, comprising the screening system described above.

[0050] The technical solution of the present invention has the following advantages:

[0051] 1. The screening system provided by the present invention 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 arranged 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 agglomerated crops, and avoid the discharge of grains entrained by the crop straw, causing waste. At the same time, a front sealing structure is arranged at the front end of the corrugated plate to prevent the grains from being thrown out by the vibrating screen. A grain separation structure is arranged between the grain collection area and the debris collection area below the vibrating screen to effectively separate the clean grains from the debris such as straw, so that the grain collection is more complete and cleaner, avoiding waste and improving the screening efficiency.

[0052] 2. The screening system provided by the present invention has a lifting structure of a shaking screen, including a mounting member and a plurality of screen teeth, wherein the mounting member has an assembly surface and a mounting surface that is opposite to the assembly surface and is arranged at an acute angle to the assembly surface, and the screen teeth extend along the opening direction of the angle formed between the assembly surface and the mounting surface, and one end is a fixed end that is fixed on the mounting surface at intervals, and the other end is a free end that is suspended. When the vibrating screen vibrates back and forth as a whole, the crops slide from the corrugated plate to the shaking screen, and are lifted up by the shaking of the suspended screen teeth, and then fall onto the fish scale screen, thereby shaking and loosening the crops. In addition, the shaking screen can be arranged on the corrugated plate at different inclination angles according to different needs, making full use of the space, so that the screening system has a more compact structure while ensuring the screening effect.

[0053] 3. The screening system provided by the present invention has a sealing member fixedly arranged between the front material plate for guiding the grains to slide down below the threshing drum of the harvester and the fan housing 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, and the two opposite sides of the sealing member in the width direction correspond to the left and right side walls of the frame and are provided with a gap. The opening connected to the vibrating screen surrounded by the front material plate located above, the fan housing located below, and the left and right side walls of the frame is blocked by the sealing member, and the crop grains are blocked by the sealing member and fall back along the fan housing to the grain collection area below the vibrating screen, so as to prevent the crop grains from flying out of the opening and falling to the ground, causing waste.

[0054] 4. The screening system provided by the present invention comprises a grain separation structure including an isolating member and a front curtain, which are arranged between the grain collecting area and the debris collecting area and fixed on the shell of the vibrating screen, the isolating surface of the isolating member extends from one side of the grain collecting area to above the debris collecting area, the front curtain extends in the same direction as the isolating surface, one end of which is fixed on the isolating member, and the other end is mounted on the bottom shell of the grain in the grain collecting area, so as to shield 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, so as to prevent the return air from carrying debris into the grain collecting area and contaminating the grains in the granary, and at the same time increase the air volume blown to the end of the lower screen, thereby improving the air selection effect.

[0055] 5. The screening system provided by the present invention 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 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, which 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 frame directly bears the gravity of the vibrating screen and the inertial force of its reciprocating motion, so that the vibration of the vibrating screen is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1It is a structural schematic diagram of a screening system in an embodiment of the present invention;

[0058] Figure 2 It is a structural schematic diagram of a shaking screen in an embodiment of the present invention;

[0059] Figure 3 It is a structural schematic diagram of a mounting plate in an embodiment of the present invention;

[0060] Figure 4 This is a schematic diagram of the structure of the screen fork group in an embodiment of the present invention;

[0061] Figure 5 This is a schematic diagram of the assembly structure of the shaking screen in an embodiment of the present invention;

[0062] Figure 6 This is a schematic diagram of the sealing plate installation structure in an embodiment of the present invention;

[0063] Figure 7 This is a schematic structural diagram of a front sealing structure in an embodiment of the present invention;

[0064] Figure 8 This is a schematic structural diagram of a grain separation structure in an embodiment of the present invention;

[0065] Fig. 9 A schematic diagram of the structure of an isolating element in an embodiment of the present invention;

[0066] Fig.10 The structure diagram of the vibrating screen drive in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0067] Fig.11 The structure diagram of the vibrating screen drive in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0068] Fig.12 Schematic diagram of the structure of the track bearing on the vibrating screen in an embodiment of the present invention;

[0069] Fig.13 It is a schematic diagram of the structure of a vibration guide rail in an embodiment of the present invention;

[0070] Fig.14 Schematic diagram of the structure of the linkage member in the embodiment of the present invention.

[0071] Description of reference numerals:

[0072] H, vibrating screen; M, grain collection area; N, debris collection area;

[0073] 1. Frame; 12b. Support beam;

[0074] 1d, mounting plate; 11d, mounting surface; 12d, assembly surface; 2d, screen teeth; 3d, screen fork unit; 4d, screen fork group; 5d, pressing plate; 6d, corrugated plate; 7d, fish scale screen; 8d, lower screen;

[0075] 1e, partition plate; 11e, flange; 2e, connecting plate; 3e, front curtain; 4e, rear curtain; 5e, seed bottom shell; 6e, miscellaneous bottom shell;

[0076] 1f, sealing plate; 2f, front material plate; 3f, fan housing; 4f, visible part; 5f, screen front plate; 6f, first shielding part; 7f, second shielding part; 8f, butterfly nut;

[0077] 2g, bearing seat; 3g, transmission shaft; 4g, eccentric bearing; 5g, driving wheel; 61g, track bearing; 62g, vibration track; 7g, linkage; 71g, ring sleeve; 72g, linkage plate; 8g, counterweight; 9g, protective plate;

[0078] 1h, screen frame; 11h, rear slide plate; 12h, adjustment plate; 2h, tail screen; 21h, mounting seat; 22h, tail screen piece. DETAILED DESCRIPTION

[0079] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0080] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0081] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0083] Example 1

[0084] This embodiment provides a screening system, such as Figure 1 , Figure 5 , Fig.11 and Fig.12 As shown, it includes a vibrating screen H, a front sealing structure, a grain separation structure and a driving structure. The vibrating screen H has an upper screen area and a lower screen area 8d. A lifting structure is set at the tail end of the corrugated plate 6d in the upper screen area to increase the drop between the corrugated plate 6d and the fish scale screen 7d, and cooperate with the tail screen 2h at the tail end to form a two-stage lift, which can fully shake the agglomerated crops loose and prevent the crop straw from entraining and entraining the grains and causing waste. At the same time, a front sealing structure is set at the front end of the corrugated plate 6d to prevent the grains from being thrown out by the vibrating screen H. A grain separation structure is set between the grain collection area M and the debris collection area N below the vibrating screen H to effectively separate the clean grains from the debris such as straw, so that the grain collection is more complete and cleaner, avoiding waste and improving the screening efficiency.

[0085] like Figure 1 or Figure 5 As shown, the screen frame 1h of the vibrating screen H is funnel-shaped as a whole. In this embodiment, the lifting structure is a shaking screen. In the upper screen area, a corrugated plate 6d, a shaking screen, at least one section of fish scale screen 7d and a tail screen 2h are sequentially arranged along the crop moving direction. In the lower screen area, a lower screen 8d is arranged corresponding to the fish scale screen 7d. In this embodiment, the fish scale screen 7d is arranged in two sections at intervals along the horizontal direction, and the fish scale screen pieces in the two sections of the fish scale screen 7d are arranged at an angle. For example, the fish scale screen pieces on the first section of the fish scale screen 7d close to the corrugated plate 6d are arranged vertically upward, and the fish scale screen pieces on the second section of the fish scale screen 7d close to the tail screen 2h are arranged inclined toward one side of the tail screen 2h. As shown in FIG. Figure 1 As shown, the tail screen 2h includes a mounting seat 21h and a plurality of tail screen 2h pieces, the mounting seat 21h and the fish scale screen pieces in the adjacent second-stage fish scale screen 7d are tilted and fixed on the screen frame 1h, and the plurality of tail screen 2h pieces extend obliquely upward from the mounting seat 21h in the crop moving direction and are evenly spaced and fixed on the mounting seat 21h in the horizontal direction. The upward tail screen 2h pieces form a second-stage lifting structure to fully shake out and loosen crop debris.

[0086] like Figure 5As shown in the figure, a rear slide plate 11h is provided on the screen frame 1h at one end of the tail screen 2h, and an adjusting plate 12h is slidably provided along the plate surface of the rear slide plate 11h. The rear slide plate 11h and the adjusting plate 12h are in surface contact. Three through holes (not shown in the figure) are evenly spaced on the rear slide plate 11h, and three long waist holes are provided on the corresponding adjusting plate 12h. The adjusting plate 12h is provided outside the rear slide plate 11h. Bolts are passed through the long waist holes and fixed in the through holes of the rear slide plate 11h. When the bolts are loosened, the adjusting plate 12h can slide up and down along the plate surface of the rear slide plate 11h to adjust the size of the tail crop outlet.

[0087] As Figure 2 shown, the vibrating screen 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 Figure 3 shown, the middle of the mounting plate 1d is bent to form a slope with a certain inclination angle, and this slope forms a 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 Figure 5 shown, when the vibrating screen is integrally assembled to the end of the corrugated plate 6d, the assembly surface 12d is in surface contact and fixed to the corrugated plate 6d. 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 screen vibrates reciprocally as a whole, the crop slides from the corrugated plate 6d onto the vibrating screen and is shaken up by the suspended sieve teeth 2d and then falls onto the scale screen 7d, realizing the shaking and loosening of the crop. In addition, the vibrating screen 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.

[0088] As Figure 4 shown, in this embodiment, the sieve teeth 2d are cylindrical structures, and of course, they can also be sheet-like structures, depending on the specific situation. Any sieve tooth 2d is bent in a stepped 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 said sieve fork groups 4d are evenly spaced on the mounting surface 11d. As Figure 2As shown, all the screen fork groups 4d are pressed and welded to the mounting surface 11d of the mounting plate 1d by the pressing plate 5d. The length of each screen tooth 2d suspended in the air is relatively long, which can not only lift the crops to fall to the height of the fish scale screen 7d, but also improve the elasticity of the screen teeth 2d, so that the shaking effect is more obvious when the screen moves with the vibration screen.

[0089] In this embodiment, the mounting plate 1d, the screen teeth 2d and the pressing plate 5d are all made of aluminum alloy to reduce the weight of the entire screening system, thereby reducing vibration inertia.

[0090] A front material plate 2f for guiding crop grains to slide down is arranged below the threshing drum, one end of the front material plate 2f is fixed to the front frame 1, and the plate surface is inclined downward from the front end of the frame 1 to the rear end of the frame 1. The other end of the front material plate 2f is located above the vibrating screen H and is located within the orthographic projection of the vibrating screen H on the horizontal plane.

[0091] like Figure 6 As shown, the front sealing structure includes a sealing member, a first shielding member 6f and a second shielding member 7f. The sealing member is fixed between the front material plate 2f and the fan housing 3f below the front material plate 2f. The width of the sealing member is not less than the screen surface width of the vibrating screen H between the front material plate 2f and the fan housing 3f, and 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 provided with gaps. In this embodiment, the sealing member adopts a sealing plate 1f, and the upper end of the sealing plate 1f is provided with a flange, which is fixed to the lower surface of the front material plate 2f by bolts, and the lower end of the sealing plate 1f is fixed to the flange of the fan housing 3f by bolts, and the gaps between the two sides of the sealing plate 1f and the left and right side walls of the frame 1 are filled and sealed by sealant.

[0092] In this embodiment, Figure 6 or Figure 7 As shown, the sealing plate 1f is bent, a section near the front material plate 2f is vertically arranged, and a section near the fan housing 3f is inclined, forming a slope with the outer wall of the fan housing 3f, which is convenient for guiding the crop grains leaking from the vibrating screen H. Figure 6 As shown, at least one observation port is provided in the vertical section of the sealing plate 1f. In this embodiment, two observation ports are provided, and a visual component 4f is fixed to each observation port through a butterfly nut 8f for observing the crop accumulation condition of the vibrating screen H. The visual component 4f can be a transparent acrylic plate or a glass plate, preferably an acrylic plate, which is light and not easily broken.

[0093] The sealing plate 1f is used to block the opening connected to the vibrating screen H formed by the front material plate 2f located above, the fan casing 3f located below, and the left and right side walls of the frame 1. The crop grains are blocked by the sealing plate 1f and fall back along the fan casing 3f to the grain collecting area below the vibrating screen H, so as to avoid the crop grains flying out of the opening and falling to the ground, causing waste.

[0094] Furthermore, in order to prevent the accumulation of crop grains between the fan housing 3f and the sealing plate 1f, as shown in FIG. Figure 7 As shown, a first shielding member 6f is also provided, one end of the first shielding member 6f is fixed to one end of the front material plate 2f located above the vibrating screen H, and the other end of the first shielding member 6f is fixed to the screen front plate 5f located at the front end of the vibrating screen H, and the first shielding member 6f is arranged at a certain angle to the screen surface of the vibrating screen H. The width of the first shielding member 6f is not less than the screen surface width of the vibrating screen H, and the first shielding member 6f is a flexible member, and after the two ends of the first shielding member 6f are fixed, there is still an extension margin for the reciprocating vibration of the vibrating screen H to avoid hindering the movement of the vibrating screen H.

[0095] like Figure 7 As shown, a second shielding member 7f is fixed to one end of the first shielding member 6f on the front material plate 2f, and the other end of the second shielding member 7f is a free end, which naturally hangs down to the screen surface of the vibrating screen H, and double-layer isolation is performed by two shielding members arranged in front and behind.

[0096] In this embodiment, the first shielding member 6f and the second shielding member 7f are both canvas.

[0097] like Figure 8 As shown, the seed separation structure includes a partition and a front curtain 3e. Figure 1 As shown, the isolating member is arranged between the seed collecting area M and the debris collecting area N and is fixed on the housing of the vibrating screen. The width of the isolating member is the same as the width of the seed collecting area M and the debris collecting area N.

[0098] In this embodiment, Figure 8As shown in the figure, the separator includes a partition plate 1e and connecting plates 2e provided on both sides of the partition plate 1e. The width of the connecting plate 2e is the same as that of the partition plate 1e, and the connecting plate 2e and the partition plate 1e are arranged in a U-shaped structure. One end of the connecting plate 2e is fixed to the partition plate 1e, and the other end is fixed to the housing of the vibrating screen. The plate surface of the partition plate 1e extends obliquely upward from the grain collection area M to above the residue collection area N. The two side plate surfaces of the partition plate 1e form isolation surfaces. The front 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, which connects the grain collection area M and the residue collection area N. This enables the air blown by the fan to travel along the front curtain 3e and the partition plate 1e and blow out from the opening formed between the upper end of the partition plate 1e and the lower sieve 8d, preventing the回风 (return air) from carrying residues into the grain collection area M and contaminating the grains in the granary. At the same time, it can also increase the air volume blown to the end of the lower sieve 8d and improve the effect of winnowing.

[0099] The front curtain 3e is a rubber curtain or a canvas curtain. In this embodiment, the front curtain 3e is a rubber curtain, such as Figure 8 or Figure 1 As shown in the figure, 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.

[0100] such as Figure 8 As shown in the figure, a rear curtain 4e is also provided in the residue 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 residue bottom shell 6e in the residue collection area N, further preventing the return air from lifting the front curtain 3e and causing residues to enter the grain collection area M. The width of the rear curtain 4e is less than the straight-line distance from its fixed point on the partition plate 1e to the auger in the residue collection area N, preventing it from being wound around the rear curtain 4e when the auger rotates and causing a malfunction. Similarly, the rear curtain 4e is a rubber curtain or a canvas curtain. In this embodiment, the rear curtain 4e is a rubber curtain, such as Figure 8 or Figure 1 As shown in the figure, a part of the rubber curtain is placed on the residue bottom shell 6e and naturally hangs down along the surface of the residue bottom shell 6e. The rubber curtain in contact with the residue 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 residue bottom shell 6e.

[0101] The partition plate 1e, the front curtain 3e, and the rear curtain 4e form a herringbone isolation structure erected between the grain collection area M and the residue collection area N, fully isolating the grain collection area M and the residue collection area N to avoid cross-contamination and ensure the cleanliness of the grains entering the granary.

[0102] such as Fig. 9As shown, the partition plate 1e is provided with a flange 11e at one end of the seed collection area M toward the debris collection area N, and the angle between the flange 11e and the plate surface of the partition plate 1e is an obtuse angle. The flange 11e is provided to guide the swirling wind traveling along the inner wall surface of the debris bottom shell 6e and the rear curtain 4e, and to prevent the crop debris entrained in the swirling wind from entering the seed collection area M through the opening between the partition plate 1e and the lower screen 8d.

[0103] As an alternative implementation of this embodiment, the rear curtain 4e may not be provided, and only the front curtain 3e may be provided.

[0104] like Fig.10 As shown, the driving structure includes two bearing seats 2g, a transmission shaft 3g, two eccentric bearings 4g and a driving wheel 5g. The frame of the harvester is composed of a plurality of vertically arranged support beams 12b and assembly beams erected between the support beams 12b. A frame housing is installed between adjacent beams, and a mounting cavity is formed in the housing. The vibrating screen H is installed in the mounting cavity.

[0105] like Fig.10 As shown, two bearing seats 2g are respectively fixed on the side walls of two symmetrical support beams 12b at the rear end of the frame, and an outer spherical bearing is installed in any bearing seat 2g, and the two ends of the transmission shaft 3g are respectively fixed in the outer spherical bearings. Two eccentric bearings 4g are fixed at the two ends of the transmission shaft 3g in a mirror image, one end of the vibrating screen H is fixed on the two eccentric bearings 4g, and the other end is set on the frame through a reciprocating guide structure. The driving wheel 5g is fixed on one end of the transmission shaft 3g, which is suitable for being driven by the driver of the harvester and driving the transmission shaft 3g to rotate. The bearing seat 2g is directly fixed on the support beam 12b of the frame to avoid transition connection, and the frame directly bears the gravity of the vibrating screen H and the inertial force of its reciprocating motion, so that the vibration of the vibrating screen H is more stable.

[0106] The reciprocating guide structure includes two track bearings 61g and a vibration track 62g corresponding to the two track bearings 61g. Fig.12 As shown, the track bearings 61g are symmetrically fixed on both sides of the vibrating screen H and away from one end of the transmission shaft 3g, and the two vibrating tracks 62g are symmetrically arranged on the frames on both sides of the vibrating screen H, as shown in FIG. Fig.13 As shown, the vibration track 62g is composed of a bottom plate and side plates arranged on the bottom plate, a guide channel is formed between the two side plates, the guide direction of the vibration track 62g is set at an angle to the horizontal plane, and the track bearing 61g is slidably set in the vibration track 62g.

[0107] A linkage member 7g is provided between the vibrating screen H and the eccentric bearing 4g, such as Fig.14As shown, the linkage member 7g includes a ring sleeve 71g and a linkage plate 72g welded and fixed on the ring sleeve 71g, one end of the ring sleeve 71g is open and flanged, and the flange is perpendicular to the wall surface of the ring sleeve 71g, and the ring sleeve 71g is sleeved and fixed on the eccentric bearing 4g. The other end of the linkage plate 72g is fixed on the side screen body of the vibrating screen H.

[0108] like Fig.10 or Fig.11 As shown, the protective plate 9g is fixed on the support beam 12b close to the driving wheel 5g, and the plate surface of the protective plate 9g is extended along the radial direction of the transmission shaft 3g. In this embodiment, the protective plate 9g is straddled on the bearing seat 2g and is set with a gap between the bearing seat 2g. The area of ​​the protective plate 9g is larger than the cross-sectional area of ​​the driving wheel 5g, so as to fully block the crop straw and other debris screened from the tail of the vibrating screen H, and prevent the debris from entering the driving area on one side of the frame, causing entanglement or blockage, and affecting the normal operation of the machine.

[0109] For example Fig.10 or Fig.11 As shown, a counterweight 8g is detachably installed on the driving wheel 5g, and a counterweight 8g is also arranged at one end of the transmission shaft 3g away from the protective plate 9g. The counterweight block 8g is detachably fixed on the connecting block, and the connecting block is fixed on the transmission shaft 3g. The counterweight blocks at both ends of the transmission shaft 3g are asymmetrically arranged. When the transmission shaft 3g rotates and drives the vibrating screen H to reciprocate, the asymmetrically arranged counterweight 8g is used to avoid excessive reciprocating vibration of the vibrating screen H, thereby ensuring the balance of the overall vibration of the vibrating screen H.

[0110] Example 2

[0111] This embodiment provides a combine harvester, including the screening system in Embodiment 1.

[0112] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A screening system, characterized in that: include: A vibrating screen (H) having an upper screen area and a lower screen (8d) area; the screen frame (1h) of the vibrating screen (H) is in a funnel-shaped structure as a whole; 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 arranged in the lower screen (8d) area corresponding to the fish scale screen (7d); A front sealing structure, sealingly fixed to the front end of the corrugated plate (6d); A grain separation structure is arranged at the end of the lower screen (8d) and straddles the grain collection area (M) and the debris collection area (N); A driving structure, fixed on the frame (1), suitable for driving the vibrating screen (H) to vibrate reciprocatingly; The front sealing structure comprises: A sealing member is fixed between a front material plate (2f) at the front end of the corrugated plate (6d) and a fan housing (3f) located below the front material plate (2f); the width of the sealing member is not less than the screen surface width of the vibrating screen (H) between the front material plate (2f) and the fan housing (3f); Two opposite sides of the sealing member in the width direction correspond to the left and right side walls of the frame (1) and are arranged with a gap therebetween; A 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); 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).

2. The screening system according to claim 1, characterized in that The fish scale screen (7d) 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 (7d) are arranged at an angle.

3. The screening system according to claim 2, characterized in that The tail screen (2h) comprises: A mounting seat (21h) is arranged in the same direction as the adjacent fish scale screen and is fixed on the screen frame (1h); A plurality of tail screen (2h) pieces are arranged to extend 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, characterized in that: 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) which is located on a side facing away from the assembly surface (12d) and is arranged at an acute angle with the assembly surface (12d); the assembly surface (12d) is fixed to the rear end of the corrugated plate (6d); A plurality of screen teeth (2d) extend along the opening direction of the angle formed by the assembly surface (12d) and the mounting surface (11d), and one end is a fixed end fixed at intervals on the mounting surface (11d), and the other end is a free end and is 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 claim 1, 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.

8. The screening system according to any one of claims 1 to 4, characterized in that: The seed separation structure comprises: An isolation member is arranged between the seed collection area (M) and the debris collection area (N), and is fixed on the screen frame (1h); an isolation surface of the isolation member extends from one side of the seed collection area (M) to above the debris collection area (N); A front curtain (3e) extends in the same direction as the isolation surface, with one end fixed on the isolation member and the other end mounted on the seed bottom shell (5e) in the seed collection area (M); and is suitable for covering an opening formed between the isolation member and the seed bottom shell (5e) and connecting the seed collection area (M) and the debris collection area (N).

9. The screening system according to claim 8, characterized in that The seed separation structure further comprises: A rear curtain (4e) is arranged at an angle with the isolation surface, with one end fixed on the isolation member and the other end mounted on the debris bottom shell (6e) in the debris collection area (N); and is suitable for covering the opening formed between the isolation member and the debris bottom shell (6e) and connecting the debris collection area (N) and the grain collection area (M).

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

11. The screening system according to claim 10, characterized in that The reciprocating guide structure comprises: Two track bearings (61g) are symmetrically arranged on both sides of the screen frame (1h) and away from one end of the transmission shaft (3g); Two vibration rails (62g) are symmetrically arranged on the frame (1) on both sides of the screen frame (1h); the guiding direction of the vibration rail (62g) is arranged at an angle with the horizontal plane; the rail bearings (61g) are slidably arranged in the vibration rails (62g) in one-to-one correspondence.

12. The screening system according to claim 11, characterized in that 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 arranged to extend radially along the transmission shaft (3g); The area of ​​the protection plate (9g) is larger than the cross-sectional area of ​​the driving wheel (5g).

13. A combine harvester, characterized in that: A screening system comprising any one of claims 1-12.

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