Screening and combine system

Abstract

This invention provides a screening system and a combine. The screening system provided by this invention includes a vibrating plate, a front dust collecting structure, a grain separating structure, and a driving structure. The vibrating plate has an upper plate region and a lower plate region. In the upper plate area, a lifting structure is placed at the end of the corrugated plate to improve the drop between the corrugated plate and the fish scale screen, and two lifting surfaces are formed with an end screen at the end to thoroughly shake and loosen the accumulated products and prevent waste caused by the discharge of grains carried with crop straw. At the same time, a front dusting structure is placed at the front end of the corrugated plate to prevent grains from being thrown away by the vibrating plate. The grain separation structure between the grain collection area and the chaff collection area is arranged under the vibrating plate to effectively separate clean grains and chaff such as straw, thereby making grain collection more complete and clean, preventing waste, and improving screening efficiency.

Description

Screening and combine system Technical background This invention relates to the technical field of agricultural machinery and, in particular, to a screening system and a combine harvester. Background The threshing system of the crawler combine can be divided into two types: 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 forms of structures currently used in the market. In the screening area of ​​the existing combine, the separation and screening of debris, such as crop grains and straw, is carried out through the reciprocating vibration of the vibrating plate, which moves along an elliptical vibrating path. Although a front corrugated plate in the vibrating plate is inclined downward and toward the end of the combine to guide the movement of the crops, the vibrating component of the vibrating plate in the horizontal direction still causes the grains to fall out of the front end of the vibrating plate. In the prior art, a tarpaulin is placed at the front end of the vibrating plate for protection. However, the vibrating plate is continuously operated during operation. To accommodate the amplitude of the vibrating plate, the tarpaulin needs to be sufficiently stretched and cannot be fixed, so there will be a gap between the tarpaulin and the vibrating plate and between the tarpaulin and the left and right walls of the frame. During vibration, the gaps will increase from time to time, resulting in crop grains leaking and crop grains falling from the front of the frame to the ground, so that the crop grains are not collected, causing waste. At the same time, the isolation between the grain collection area and the chaff under the vibrating plate is not complete, which causes straw and other chaff to mix with the grain and affect the grain cleaning. The corrugated plate is inclined downward towards the end of the combine, and the drop between the corrugated plate and the adjacent fish scale screen is small, and at the same time, the up-down drop of the elliptical vibration path of the vibrating plate is small, so that the products cannot be fully lifted, shaken and loosened on the vibrating plate, which leads to waste due to the unloading of the grains carried by the accumulated straw. Summary Therefore, the technical problem to be solved by this invention lies in overcoming the low screening efficiency and waste of resources of the combine screening system in the prior art. According to one aspect of the invention, the invention provides a screening system comprising: A vibrating screen has an upper screen area and a lower screen area. A vibrating screen frame has a funnel-shaped structure in which A corrugated plate, a lifting structure, at least a portion of a fish scale screen, and an end screen are arranged in the upper plate area in the direction of product movement, respectively, and A bottom plate is placed in the bottom plate area corresponding to the fish scale sieve. A front dust-proof structure fixed as a seal at the front end of the corrugated plate. A grain separation structure is placed at the end of the lower plate and covers the area between the grain collection area and the chaff collection area. A driving structure fixed to a frame and adapted to move the vibrating plate to perform reciprocating vibration. Preferably, the fish scale screen is provided with two sections spaced apart in the horizontal direction, and the fish scale screen sheets in the two sections are arranged at an angle. Preferably, the end screen includes: A mounting position that is placed obliquely in the same direction as the adjacent sheets with the fish scale screen and fixed to the screen frame, and A large number of end screen sheets extending diagonally from the mounting position in the direction of product movement upwards and fixed at uniform intervals in the horizontal direction on the mounting position. Preferably, the screen frame includes a rear sliding screen that is aligned with the end screen and a slidable adjustment plate disposed along the surface of the rear sliding screen. Preferably, the lifting structure is a vibrating plate, and the plate includes: A mounting section is provided with a mounting surface and a mounting surface on a side away from the mounting surface and disposed at an acute angle to the mounting surface, and the mounting surface is fixed at the end of the corrugated plate, and A large number of toothed plates extend in the direction of the opening of the angle between the assembly surface and the mounting surface, where one end is fixed at a distance to the mounting surface and the other end, which is free, is suspended. Preferably, each of the toothed plates is curved in a stepped shape that is configured to guide the product to move along the toothed plate from the fixed end on the mounting surface to the free end. Preferably, the front dust collector structure includes: A dust collecting section fixed between the front material plate at the front end of the corrugated plate and a fan located below the front material plate, wherein the width of the dust collecting section is not less than the width of the vibrating plate surface between the front material plate and the fan; and The two opposite side edges correspond to the left and right walls of the frame in the transverse direction of the dust collector section, respectively, and are in a suitable space. Preferably, the space between the two side edges of the dust collector section and the left and right walls of the frame is filled with sealant. Preferably, the front dust collector structure also includes: The first protective section is located between the front material plate and the front plate of the vibrating plate, wherein the first protective section is a flexible section having an additional margin for the reciprocating vibration of the vibrating plate. Preferably, the front dust collector structure includes: The second protective section, one end of which is fixed to one end of the front material plate facing the vibrating plate, and the other end is a free end and naturally falls onto the surface of the vibrating plate. Preferably, the grain separation structure comprises: A separator positioned between the grain collection area and the chaff collection area and fixed to the screen frame. A separator separation surface extending from one side of the grain collection area to the upper part of the chaff collection area, and A front flap extends in the same direction as the separation surface, one end of which is fixed to the separator and the other end of which is placed on the lower grain shell in the grain collection area, and is adapted to protect the opening between the separator and the lower grain shell, and connects the grain collection area and the chaff collection area. Preferably, the grain separation structure comprises the following. A rear hatch is positioned at an angle to the separation surface, with one end fixed to the separator and the other end resting on the chaff undershell in the chaff collection area, and is adapted to protect the opening between the separator and the chaff undershell, connecting the chaff collection area and the grain collection area. Preferably, the stimulus structure includes the following: Two bearing seats are respectively fixed on the side wall surfaces of the two support legs, which are symmetrically and vertically located at the ends of the frame. An outer spherical bearing is installed in each of the bearing seats. A transmission shaft, both ends of which are fixed on outer spherical bearings, respectively. Two eccentric bearings, respectively fixed at both ends of the transmission shaft in a mirror image, in which One end of the plate frame is fixed on two eccentric bearings, and the other end is adjusted on the frame through a reciprocating guide structure, and A drive wheel fixed to one end of the transmission shaft and set to be moved by the combine operator and rotate the transmission shaft. Preferably, the round-trip guide structure includes: Two linear bearings located symmetrically on both sides of the plate frame and away from one end of the transmission shaft, and Two vibration paths are symmetrically placed on the frame on both sides of the plate frame, in which the direction of the vibration path is set at an angle to the horizontal plane, and linear bearings are slidably placed in the vibration paths in one-to-one communication. Preferably, the driving structure includes: A protective plate is fixed on the support base next to the driving wheel, where the surface of the protective plate extends along the radial direction of the transmission axis, and The area of ​​the guard plate is larger than the cross-sectional area of ​​the drive wheel. According to another aspect of the present invention, there is provided a combine harvester comprising the above screening system. The technical solution of this invention has the following advantages: 1. The screening system provided by this invention includes a vibrating plate, a front dust collecting structure, a grain separation structure and a driving structure. The vibrating plate has an upper plate area and a lower plate area. In the upper plate area, a lifting structure is provided at the end of the corrugated plate to improve the drop between the corrugated plate and the fish scale screen, and two lifting surfaces are formed together with the end screen at the end to thoroughly shake and loosen the accumulated products and prevent waste caused by the discharge of the grains carried with the crop straw. At the same time, a front dust collecting structure is provided at the front end of the corrugated plate to prevent the grains from being thrown away by the vibrating plate. The grain separation structure between the grain collection area and the chaff collection area is arranged under the vibrating plate to effectively separate clean grains and chaff such as straw, thereby making grain collection more complete and clean, preventing waste, and improving screening efficiency. 2. In the screening system provided by this invention, the lifting structure is a vibrating plate, and the vibrating plate includes a mounting portion and a plurality of toothed plates. The mounting portion has a mounting surface and a mounting surface on one side, away from the mounting surface, and is arranged at an acute angle with the mounting surface. The plurality of toothed plates extend in the direction of opening the angle between the mounting surface and the mounting surface, in which one end which is fixed is fixed with a distance on the mounting surface and the other end which is free is suspended. When the vibrating plate vibrates reciprocatingly in general, the products slide from the corrugated plate to the vibrating plate and rise up by shaking the suspended toothed plate, and then fall on the fish scale screen to shake the loose products. In addition, the shaking plate can be placed on the corrugated plate at different inclination angles according to different needs, which makes full use of space and makes the screening system more compact and ensures the screening effect. 3. In the screening system provided by this invention, a dust collecting section is fixed between the front material plate and the fan located under the front material plate to guide the grains downward. The width of the dust collecting section is not less than the width of the vibrating plate surface between the front material plate and the fan, and the two opposite edges in the transverse direction of the dust collecting section correspond to the left and right walls of the frame, respectively, and are in a suitable space. The opening communicating with the vibrating plate is surrounded by the front material plate at the upper part. The fan at the lower part and the left and right walls of the frame are blocked by the dust collecting section, and the grains of the crop fall into the grain collection area at the lower part of the vibrating plate along the fan. Therefore, the grains of the crop are prevented from falling out of the opening and falling to the ground, resulting in waste. 4. In the screening system provided by this invention, the grain separation structure includes a separator and a front gate. The separator is located between the grain collection area and the chaff collection area and is fixed on the vibrating plate cover. A separation surface of the separator extends from one side of the grain collection area to the top of the chaff collection area. The front gate extends in the same direction as the separation surface, with one end fixed on the separator and the other end on the grain bottom shell in the grain collection area, and is adapted to protect the opening between the separator and the grain bottom shell, and connects the grain collection area and the chaff collection area. The air blown by the fan moves along the front gate and the separator and is discharged from the opening between the separator and the bottom plate to prevent the chaff from being carried by the return air to the grain collection area and polluting the grain in the granary. At the same time, the volume of air blown to the bottom of the lower plate is increased and the wind separation effect is improved. 5. In the screening system provided by this invention, the driving structure includes 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 support legs symmetrically arranged at the ends of the frame, and an outer spherical bearing is installed in each of the bearing seats. Both ends of the transmission shaft are respectively fixed on the outer spherical bearings. The two eccentric bearings are respectively fixed at both ends of the transmission shaft in a mirror image manner, in which one end of the plate frame is fixed on the two eccentric bearings, and the other end is adjusted on the frame through a reciprocating guide structure. The driving wheel is fixed at one end of the transmission shaft and is adjusted to be driven by the combine driver to rotate the transmission shaft. The bearing seats are fixed directly to the frame support legs to prevent a translational connection.The frame directly bears the gravity of the vibrating plate and the inertial force of its reciprocating motion, which makes the vibration of the vibrating plate more stable. Brief description of the shapes In order to more clearly explain specific embodiments of this invention or technical solution in the prior art, the forms required for use in specific embodiments or prior art description are briefly described below, and it will be apparent that the forms in the following description are some embodiments of this invention from which other forms may be obtained without creative effort by those of ordinary skill in the art. Figure 1 is a schematic structural diagram of a screening system in an embodiment of the present invention. Figure 2 is a schematic structural diagram of a shaking plate in an embodiment of the present invention. Figure 3 is a schematic structural diagram of a mounting plate in an embodiment of the present invention. Figure 4 is a schematic structural diagram of a fork plate group in an embodiment of the present invention. Figure 5 is a schematic diagram of the structure of the shaker plate assembly in an embodiment of the present invention. Figure 6 is a schematic diagram of the installation structure of a dust collector plate in an embodiment of the present invention. Figure 7 is a schematic structural diagram of a front dust collector structure in an embodiment of the present invention. Figure 8 is a schematic structural diagram of a grain separation structure in an embodiment of the present invention. Figure 9 is a schematic structural diagram of a separator in an embodiment of the present invention. Figure 10 is a first structural schematic diagram of a vibrating plate actuator in an embodiment of the present invention. Figure 11 is a second structural schematic diagram of a vibrating plate actuator in an embodiment of the present invention. Figure 12 is a schematic structural diagram of a rail bearing on a vibrating plate in an embodiment of the present invention. Figure 13 is a schematic structural diagram of a vibrating guide rail in an embodiment of the present invention; and Figure 14 is a schematic structural diagram of an interface in an embodiment of the present invention. Explanations for the symbols in the following figures: H. Vibrating plate; M. Grain collection area; N. Chaff collection area; 1. Frame, 12b. Support base; 1d. Mounting plate; 11d. Mounting surface; 12d. Assembly surface; 2d. Toothed plate; 3d. Fork plate unit; 4d. Fork plate group; 5d. Press plate; 6d. Corrugated plate; 7d. Fish scale screen; 8d. Bottom plate; 1e. Separation plate; 11e. Flange; 2e. Connection plate; 3e. Front valve; 4e. Rear valve; 5e. Grain bottom shell; 6e. Chaff bottom shell; 1f. Dust screen; 2f. Front material screen; 3f. Fan; 4f. Visual section; 5f. Front plate; 6f. First protective section; 7f. Second protective section; 8f. Butterfly nut (cock); 2g. Bearing housing; 3g Transmission shaft; 4g Eccentric bearing; 5g Drive wheel; 61g Linear bearing; 62g Vibration path; 7g Interface; 71g Ring; 72g Interface plate; 8g Balancing weight; 9g Protective plate; 1h. Screen frame; 11h Rear sliding screen; 12h Adjustment screen; 2h Sieve pulley; 21h Mounting position; 22h End screen plate Description with details A clear and complete explanation of the technical solution of this invention will be provided, together with the figures, and it will be apparent that the described embodiments are part of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments that can be obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of this invention. In describing this invention, it should be noted that the orientation or positional relationship indicated by terms such as “center,” “top,” “bottom,” “left,” “right,” “vertical,” “horizontal,” “inside,” “outside” is the orientation or positional relationship based on the accompanying figures. Such terms are merely for convenience in explaining this invention and simplifying the description and are not intended to indicate or imply that the device or part in question must be located in a particular orientation or must be constructed or operated in a particular orientation. Therefore, these terms should not be construed as a limitation on this invention. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In explaining this invention, it should be noted that unless otherwise specified and defined, terms such as "mounted", "connected" and "connection" should be understood in their broad sense, for example, the connection can be a fixed connection, a detachable connection or an integral connection, a mechanical connection or an electrical connection, a direct or indirect connection through an intermediary and a connection between two parts. For those of ordinary skill in this art, the specific meanings of the above terms in this invention can be understood with regard to the specific circumstances. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as no conflict arises between them. Visualization 1 This embodiment provides a screening screen. As shown in FIGS. 1, 5, 11 and 12, the screening system includes a vibrating screen H, a front dust collecting structure, a grain separation structure and a driving structure. The vibrating screen H has an upper plate area and a lower plate area 8d. In the upper plate area, a lifting structure is provided at the end of a corrugated plate 6d to improve the drop between the corrugated plate 6d and the fish scale sieve 7d. Two lifting plates are formed together with an end sieve 2h at the end thereof to thoroughly shake and loosen the accumulated products and prevent waste caused by the discharge of the grains carried by the crop straw. At the same time, a front dust collecting structure is provided at the front end of the corrugated plate 6d to prevent the grains from being thrown by the vibrating screen H.The grain separation structure is placed between the grain collection area M and the chaff collection area N under the vibrating plate H to effectively separate clean grains and chaff such as straw, thereby making grain collection more complete and clean, preventing waste and improving screening efficiency. As shown in Fig. 1 or 5, a plate frame 1h of the vibrating plate H has a funnel-shaped overall structure. In this embodiment, the lifting structure is a vibrating plate. A corrugated plate 6d, a vibrating plate, at least one section of a fish scale screen 7d and an end screen 2h are respectively arranged in the product moving direction in the upper plate area and a lower plate 8d in the lower plate area 8d corresponding to the fish scale screen 7d. In this embodiment, the fish scale screen 7d is provided with two sections spaced apart in the horizontal direction, and the fish scale screen sheets in the two sections of the fish scale screen 7d are arranged at an angle. For example, the fish scale sieve sheets in the first fish scale sieve section 7d are arranged vertically upward near the corrugated plate 6d, and the fish scale sieve sheets in the second fish scale sieve section 7d are arranged diagonally toward the end sieve 2h near the end sieve 2h. As shown in Fig. 1, the end sieve 2h includes a mounting position 21h and a plurality of sheets of the end sieve 2h.The mounting position 21h is arranged diagonally in the same direction as the adjacent sheets of the fish scale screen in the second section of the fish scale screen 7d and is fixed on the plate frame 1h. A plurality of roller screen sheets 2h extend obliquely from the mounting position 21h in the upward direction of the product movement and are fixed on the mounting position 21h in the horizontal direction at uniform intervals. The upward sheets of the end screen form a secondary lifting structure to completely loosen the product debris. As shown in Figure 5, the screen frame 1h is provided at one end of the end screen 2h with a rear sliding plate 11h and an adjusting plate 12h slidable along the surface of the rear sliding plate 11h. The rear sliding plate 11h and the adjusting plate 12h are connected to each other in a surface-to-surface manner. Three through holes (not shown in the figure) are evenly spaced on the rear sliding plate 11h, and three bean holes are provided in the corresponding adjusting plate 12h. The adjusting plate 12h is placed outside the rear sliding plate 11h and is inserted into the bean holes and fixed in the holes of the rear sliding plate 11h by screws. After the screws are loosened, the adjusting plate 12h can slide up and down along the surface of the rear sliding plate to adjust the output amount of the product. As shown in Fig. 2, the shaking plate includes a mounting portion and a plurality of toothed plates 2d. In this invention, the mounting portion is a plate structure, namely, a mounting plate 1d. The mounting plate 1d is provided with a mounting surface 12d and a mounting surface 11d on the side away from the mounting surface 12d and is arranged at an acute angle with the mounting surface 12d. In this invention, as shown in Fig. 3, the middle of the mounting plate 1d is bent to form an inclined surface with a certain inclination angle. The inclined surface forms a mounting surface 11d for fixing the toothed plate 2d. The lower lower surface of the mounting plate 1d forms a mounting surface 12d. As shown in Fig. 5, when the entire vibrating plate is assembled to the end of the corrugated plate 6d, the assembly surface 12d is connected to the corrugated plate 6d in a surface-to-surface manner. A plurality of toothed plates 2d extend in the direction of opening the angle between the assembly surface 12d and the mounting surface 11d, in which one end is fixed to be fixed with a gap on the mounting surface 11d and the other end is free to be suspended.When the vibrating plate vibrates in a general reciprocating manner, the products slide from the corrugated plate 6d to the shaking plate and are lifted by the shaking of the suspended tooth plate 2d, and then fall into the fish scale sieve 7d to shake the products for loosening. In addition, the shaking plate can be adjusted on the corrugated plate 6d at different inclination angles according to different needs, which makes full use of the space and makes the screening system more compact, resulting in ensuring the screening effect. As shown in FIG. 4 , in this embodiment, each of the toothed plates 2d has a cylindrical structure, and of course, depending on the specific case, it can also be of a sheet structure. Each of the toothed plates 2d is bent in a step-like shape, which is arranged to guide products to move along the toothed plates 2d from the fixed end on the mounting surface 11d to the free end. The fixed ends of the two toothed plates 2d are fixedly connected to form an n-shaped fork plate unit 3d. The two fork plate units 3d are stacked on top of each other, and an n-shaped vertical portion of one of the fork plate units 3d is stacked and fixed on one of the toothed plates 2d of the other fork plate unit 3d to form a fork plate group 4d. A number of fork plate groups 4d are spaced apart on the mounting surface 11d. As shown in Figure 2, all the fork groups 4d are pressed and welded onto the mounting surface 11d of the mounting plate 1d by a pressing plate 5d.The suspended length of each 2d tooth plate is relatively long; on the one hand, it increases the height of the products falling into the 7d fish scale screen, and on the other hand, it can improve the elasticity of the 2d tooth plates, so that when the 2d tooth plates move with the vibrating plate, the vibration effect will be more obvious. In this embodiment, the mounting plate 1d, the toothed plates 2d, and the pressing plate 5d are all made of aluminum alloy materials to reduce the weight of the entire screening system and thereby reduce vibration inertia. To guide the crop grains downward, a front material plate 2f is placed under 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 end of the frame 1. The other end of the front material plate 2f is located above and inside the orthographic protrusion of the vibrating plate H on the horizontal plane. As shown in Figure 6, the front dust collector structure includes a dust collector section, a first protective section 6f and a second protective section 7f. The dust collector section is fixed between the front material plate 2f and the fan 3f under the front material plate 2f. The width of the dust collector section is not less than the width of the vibrating plate H between the front material plate 2f and the fan 3f, and the two opposite edges in the transverse direction of the dust collector section correspond to the left and right walls of the frame 1, respectively, and are in a suitable space. In this invention, the dust collector section is a dust collector section 1f. The upper end of the dust collector section 1f is flanged and connected to the lower surface of the front material plate 2f through a screw, and the lower end is fixed to the flanged end of the fan 3f through a screw. The space between the two side edges of the dust collector section 1f and the left and right walls of the frame 1 is filled with sealant. In this invention, as shown in Fig. 6 or 7, the dust collector plate 1f is arranged in a curved shape. A portion close to the front material plate 2f is vertical, and a portion close to the fan 3f is inclined, thereby forming an inclined surface with the outer wall surface of the fan 3f and guiding the product grains leaking from the vibrating plate H. As shown in Fig. 6, at least one viewing port is provided in the vertical portion of the dust collector plate 1f. In this embodiment, two viewing ports are provided. Each viewing port is fixed with a visual portion for observing the accumulation of products that cannot be detected by the vibrating plate H through a butterfly nut 8f. The visible portion 4f may be a transparent acrylic plate or a glass plate, preferably an acrylic plate that is lightweight and not easily broken. The opening communicating with the vibrating screen H and surrounded by the front material plate 2f at the top and the fan chamber 3f at the bottom and the left and right walls of the frame 1 are blocked by the dust collector plate 1f. By blocking the dust collector plate 1f, the product grains are returned to the grain collection area at the bottom of the vibrating screen H along the fan chamber 3f to prevent the product grains from exiting the opening and falling to the ground and being wasted. In addition, as shown in Fig. 7, a first guard portion 6f is provided to prevent the accumulation of crop grains between the fan 3f and the dust collector plate 1f. One end of the first guard portion 6f is fixed to one end of the front material plate 2f above the vibrating plate H, and the other end is fixed to the front plate 5f at the frontmost end of the vibrating plate H. The first guard portion 6f is set at a certain angle with the surface of the vibrating plate H. The width of the first guard portion 6f is not smaller than the width of the vibrating plate H. The first guard portion 6f is a flexible portion that, after its two ends are fixed, has an additional margin for the reciprocating vibration of the vibrating plate H so as not to affect the movement of the vibrating plate H. As shown in Figure 7, the second protective portion 7f is also fixed to one end of the first protective portion 6f on the front material plate 2f, and the other end of the second protective portion 7f is a free end and naturally falls on the surface of the vibrating plate H. Double-layer protection is achieved by the two protective portions. In this embodiment, the first protective section 6f and the second protective section 7f are made of tarpaulin fabric. As shown in Figure 8, the grain separation structure includes a separator and a front gate 3e. As shown in Figure 1, the separator is located between the grain collection area M and the chaff collection area N and is fixed on the vibrating plate cover. The width of the separator is equal to the width of the grain collection area M and the chaff collection area N. As shown in Figure 8, in this embodiment, the separator includes a separation plate 1e and two connecting plates 2e located on both sides of the separation plate 1e. The width of the connecting plate 2e is equal to the width of the separation plate 1e, and the separation plate 1e and the connecting plates 2e are arranged in an n-shaped structure. One end of the connecting plate 2e is fixed to the separation plate 1e and the other end is fixed to the vibrating plate cover. The surface of the separation plate 1e extends obliquely from the grain collection area M to the upper side of the chaff collection area N. Both side surface surfaces of the separation plate 1e constitute the separation surfaces. The front flap 3e extends in the same direction as the surface of the separation plate 1e, one end of which is fixed on the separation plate 1e and the other end is located on the lower grain shell 5e in the grain collection area M, and is adapted to protect the opening between the separation plate 1e and the lower grain shell 5e, and connects the grain collection area M and the chaff collection area N.The fan-blown air moves along the front vent 3e and the separation plate 1e and is blown out from the opening between the separation plate 1e and the lower plate to prevent the chaff from being carried by the return air to the grain collection area M and polluting the grains in the granary. At the same time, the volume of air blown to the end of the lower plate 8d is increased, and the wind separation effect is improved. In this embodiment, the front curtain 3e is a rubber or tarpaulin flap. The front curtain 3e is a rubber flap. As shown in Figure 8 or 1, the rubber flap is partially adjusted on the lower grain shell 5e and naturally falls along the surface of the lower grain shell 5e. The rubber flap has a certain adhesion when contacting the surface of the lower grain shell 5e, which can better prevent the flap from being blown away by the fan. As shown in Fig. 8, the rear gate 4e is also located in the chaff collection area N, one end of which is fixed on the separation plate 1e and the other end is placed on the chaff lower cover 6e in the chaff collection area N. As a result, it prevents the front gate 3e from being lifted to carry chaff to the grain collection area M by the return air. The rear gate 4e has a width smaller than the straight line distance from a fixed point of the rear gate 4e on the separation plate 1e to a spiral in the chaff collection area N, and as a result, prevent damage caused by the rear gate 4e twisting when the spiral rotates. Similarly, the rear curtain 4e is a rubber or tarpaulin gate. In this embodiment, the rear curtain 4e is a rubber gate. As shown in Figure 8 or 1, the rubber valve is partially located on the bottom shell of the slag 6e and naturally flows along the surface of the bottom shell of the slag 6e.The rubber valve has a certain adhesion when in contact with the surface of the bottom shell of the waste 6e, which can better prevent the valve from being blown out by the return air circulating along the inner wall surface of the bottom shell of the waste 6e. The separation plate 1e, the front gate 3e and the rear gate 4e form a ribbed isolation structure and are located between the grain collection area M and the chaff collection area N to completely isolate these two areas, prevent cross-contamination and ensure the cleanliness of the stored grains. As shown in Figure 9, one end of the separation plate 1e is provided away from the grain collection area M with a flange 11e facing the chaff collection area N. The flange 11e and the separation plate 1e are arranged at an obtuse angle. The flange 11e is arranged to guide the return air moving along the inner wall surface of the chaff lower shell 6e and the rear hatch 4e and to prevent the product chaff contained in the return air from entering the grain collection area M through the opening between the separation plate 1e and the lower plate 8d. As an alternative implementation to this embodiment, only the front valve 3e may be provided without the rear valve 4e. As shown in Figure 10, the driving structure includes two bearing seats 2g, a transmission shaft 3g, two eccentric bearings 4g and a driving wheel 5g. The combine frame is composed of a plurality of vertically arranged support legs 12b and the supports installed between the support legs 12b. A frame cover is installed between the adjacent supports and a mounting hole is formed in the cover, and the vibrating plate H is located in the mounting hole. As shown in Fig. 10, two bearing seats 2g are respectively fixed on the side wall surfaces of two support legs 12b symmetrically located on the ends of the frame. An outer spherical bearing is installed in each of the bearing seats 2g. Both ends of the transmission shaft 3g are respectively fixed in the outer spherical bearings. Two eccentric bearings 4g are respectively fixed at both ends of the transmission shaft 3g in a mirror image manner. One end of the vibrating plate H is fixed on the two eccentric bearings 4g, and the other end is supported on the frame through a reciprocating guide structure. The driving wheel 5g is fixed at one end of the transmission shaft 3g and is adapted to be driven by the combine driver and drive the transmission shaft 3g to rotate. The bearing seats 2g are directly fixed on the frame support legs 12b to prevent translational connection. The frame directly bears the gravity of the vibrating plate H and the inertial force of its reciprocating motion, which results in the vibration of the vibrating plate H being more stable. The reciprocating guide structure includes two linear bearings 61g and two vibration paths 62g corresponding to the two linear bearings 61g. As shown in Fig. 12, the two linear bearings 61g are symmetrically arranged on both sides of the vibrating plate H and away from one end of the transmission shaft 3g. The two vibration paths 62g are symmetrically arranged on the frame 1 on both sides of the vibrating plate H. As shown in Fig. 13, the vibration path 62g is composed of a bottom plate and side plates that are oppositely arranged on the bottom plate, and there is a guide channel between the two side plates. The guiding direction of the vibration path 62g is set at an angle to the horizontal plane, and the linear bearings 61g are slidably arranged in the vibration paths. A connector 7g is formed between the vibrating plate H and the eccentric bearing 4g. As shown in Figure 14, the connector 7g includes a ring 71g and a connecting plate 72g, which are fixed to the ring 71g by welding. One open end of the ring 71g is flanged, and the flange edge is perpendicular to the wall of the ring 71g. The ring 71g covers and is fixed to the eccentric bearing 4g. The other end of the connector 7g is fixed to the side plate body of the vibrating plate H. As shown in Fig. 10 or 11, a guard plate 9g is fixed on the support base 12b on one side of the driving wheel 5g. The surface of the guard plate 9g extends along the radial direction of the transmission shaft 3g. In this embodiment, the guard plate 9g is placed on the bearing seat 2g and has a suitable distance from the bearing seat 2g. The guard plate 9g has a larger area than the cross-sectional area of ​​the driving wheel 5g. The area of ​​the guard plate 9g is larger than the cross-sectional area of ​​the driving wheel 5g to fully protect debris such as straw from the end of the vibrating plate H and to prevent debris from entering the movement area on one side of the frame, causing twisting or blockage and affecting the normal operation of the machine. As shown in Fig. 10 or 11, the balancing weight 8g is detachably mounted on the driving wheel 5g. The balancing weight 8g is also provided at one end of the transmission shaft 3g away from the guard plate 9g. The balancing weight 8g is detachably fixed on a connecting block, the connecting block is fixed on the transmission shaft 3g, and the balancing weights 8g are asymmetrically mounted on both ends of the transmission shaft 3g. In the process where the transmission shaft 3g rotates and causes the vibrating plate H to reciprocate, the asymmetrical balancing weight 8g prevents the vibrating plate H from being thrown back violently and ensures the overall vibration balance of the vibrating plate H. Incarnation 2 This embodiment provides a combine having the screening system of embodiment 1. It is clear that the embodiment described above is merely an example for clarity of the forms and is not limited to the embodiments. For those of ordinary skill in the art, other changes or developments in various forms can be made based on the above description. All embodiments need not and cannot be exhaustive. Changes or developments that are obvious from them still fall within the scope of the invention.

Claims

WHAT IS CLAIMED IS:

1. A screening system, comprising: a vibrating screen (H), having an upper screen zone and a lower screen (8d) zone; a screen frame (1h) of the vibrating screen (H) being of an overall funnel-shaped structure; wherein a corrugated plate (6d), a lifting structure, at least a section of fish scale screen (7d) and a tail screen (2h) are arranged in sequence in the crop movement direction within the upper screen zone; and a lower screen (8d) is arranged within the lower screen (8d) zone corresponding to the fish scale screen (7d); a front sealing structure, sealingly fixed on a front end of the corrugated plate (6d); the front sealing structure comprises: a sealing member, fixed between a front material plate (2f) on the front end of the corrugated plate (6d) and a fan shell (3f) located below the front material plate (2f); wherein the width of the sealing member is not less than the width of the screen surface of the vibrating screen (H) between the front material plate (2f) and the fan shell (3f); and two opposite side edges in the width direction of the sealing member correspond to and are in clearance fit with the left and right side walls of the frame (1) respectively, clearances between the two side edges of the sealing member and the left and right side walls of the frame (1) are filled with sealant, a grain separation structure, arranged on a tail end of the lower screen (8d) and spanning between a grain collection zone (M) and a debris collection zone (N); and a drive structure, fixed to a frame (1) and adapted to drive the vibrating screen (H) to do reciprocating vibration.

2. The screening system according to claim 1, characterized in that the fish scale screen (7d) is provided with two sections at intervals in the horizontal direction; and sheets of the fish scale screen in the two sections of the fish scale screen (7d) are arranged at an included angle.

3. The screening system according to claim 2, characterized in that the tail screen (2h) comprises: a mounting seat (21h), arranged obliquely in the same direction as the adjacent sheets of the fish scale screen and fixed on the screen frame (1h); and a plurality of sheets of the tail screen (2h), extending obliquely upward from the mounting seat (21h) in the crop movement direction and are fixed on the mounting seat (21h) at uniform 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) slidable along the plate surface of the rear slide plate (11h).

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

6. The screening system according to claim 5, characterized in that any one of the screen teeth (2d) is bent in a step-like shape, which is adapted to guide crops to move along the screen teeth (2d) from the fixed end on the mounting surface (11d) to the free end.

7. The screening system according to claim 1, characterized in that the front sealing structure further comprises: a first shielding member (6f), arranged between the front material plate (2f) and a screen front plate (5f) of the vibrating screen (H); wherein the first shielding member (6f) is a flexible member having an extension margin for reciprocating vibration of the vibrating screen (H).

8. The screening system according to claim 1, characterized in that the front sealing structure further comprises: a second shielding member (7f), one end of which being fixed on one end of the front material plate (2f) facing the vibrating screen (H), and the other end of which being a free end and naturally drooping to the screen surface of the vibrating screen (H).

9. The screening system according to any one of claims 1-4, characterized in that the grain separation structure comprises: a separator, arranged between the grain collection zone (M) and the debris collection zone (N) and fixed on the screen frame (1h); a separation surface of the separator extending from one side of the grain collection zone (M) to the upper side of the debris collection zone (N); and a front shutter (3e), extending in the same direction as the separation surface, one end of which being fixed on the separator, and the other end of which being set on a grain bottom shell (5e) in the grain collection zone (M); and being adapted to shield an opening formed between the separator and the grain bottom shell (5e) and connecting the grain collection zone (M) and the debris collection zone (N).

10. The screening system according to claim 9, characterized in that the grain separation structure further comprises: a rear shutter (4e), arranged at an angle with the separation surface, one end of which being fixed on the separator, and the other end of which being set on a debris bottom shell (6e) in the debris collection zone (N); and being adapted to shield an opening formed between the separator and the debris bottom shell (6e) and connecting the debris collection zone (N) and the grain collection zone (M).

11. The screening system according to any one of claims 1-4, characterized in that the driving structure comprises: two bearing seats (2g), respectively fixed on side wall surfaces of two support beams (12b) symmetrically and vertically arranged on the tail end of the frame (1); an outer spherical bearing being installed in any one of the bearing seats (2g); a transmission shaft (3g), both ends of which being respectively fixed in the outer spherical bearings; two eccentric bearings (4g), respectively fixed at both ends of the transmission shaft (3g) in a mirror image manner; wherein 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; and a driving wheel (5g), fixed at one end of the transmission shaft (3g) and adapted to be driven by a driver of a harvester and drive the transmission shaft (3g) to rotate.

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

13. The screening system according to claim 12, characterized in that the driving structure further comprises: a protective plate (9g), fixed on the support beam (12b) on the side of the driving wheel (5g); wherein the plate surface of the protective plate (9g) extends along the radial direction of the transmission shaft (3g); and the area of the protective plate (9g) is larger than the cross-sectional area of the driving wheel (5g).

14. A combine harvester, characterized by comprising the screening system according to any one of claims 1-13.

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