Air outlet backflow blocking structure and harvester

Abstract

The utility model provides an air outlet backflow blocking structure and a harvester. The air outlet backflow blocking structure comprises an induction assembly and a baffle assembly. The induction assembly is provided with a fixed part fixed to the harvester and an induction part which is rotationally connected with the fixed part and extends towards an inlet of the cleaning machine. The baffle assembly is arranged at a lower air duct of the dust collection fan; the induction assembly is connected with the baffle assembly through the transmission assembly. When grain straw passes through an inlet of the cleaning machine and presses the sensing part downwards, the baffle assembly rotates in the first direction through the transmission assembly, so that the baffle assembly closes the lower air duct to block out air backflow; and when no grain straw passes through the inlet of the cleaning machine, the baffle assembly rotates in the second direction through the transmission assembly, so that the baffle assembly opens the lower air duct. The baffle assembly can be automatically opened or closed according to the harvesting operation state, and therefore the cleaning state can be adjusted. The state of harvesting operation can be obtained through the sensing assembly, and the baffle assembly can be driven to be opened or closed through the transmission assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural machinery equipment, in particular to a blocking air outlet backflow structure and a harvester. BACKGROUND

[0002] The semi-feed harvester suction fan is used for separating grains and impurities, combined with Figure 1 As shown in the figure, during the cleaning process, the airflow generated by the suction fan 1' will suck out lighter impurities such as broken leaves from the body. In the actual working process, the lower volute of the suction fan 1' is limited by the structure, resulting in that the suction fan 1' inlet (producing the cleaning wind 2') and the suction fan 1' outlet (producing the air outlet 3') are adjacent, and the high-pressure airflow discharged after the suction fan 1' works will backflow (back air 4') to the suction fan 1' inlet, forming a certain cycle, which will cause part of the impurities that have been cleaned out to re-enter the screen box with the back air 4', thereby reducing the working efficiency of the suction fan 1' and the cleaning effect is not ideal.

[0003] Therefore, there is an urgent need for a blocking air outlet backflow structure and a harvester to solve the technical problems existing in the prior art to some extent. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a blocking air outlet backflow structure and a harvester, which can prevent the high-pressure airflow of the suction fan from backflowing to the suction fan inlet to some extent, thereby improving the cleaning effect of impurities.

[0005] The present application provides a blocking air outlet backflow structure, which is arranged in a harvester, the harvester has a cleaning machine and a suction fan arranged at intervals; the blocking air outlet backflow structure comprises a sensing assembly and a baffle assembly;

[0006] The sensing assembly has a fixed part fixed to the harvester and a sensing part rotatably connected with the fixed part and extending towards the inlet of the cleaning machine;

[0007] The baffle assembly is arranged at the lower air duct of the suction fan; the baffle assembly is connected with the sensing assembly through a transmission assembly;

[0008] When the grain straw passes through the inlet of the cleaning machine and presses down the sensing part, the baffle assembly rotates in the first direction through the transmission assembly, so that the baffle assembly closes at least part of the lower air duct to block at least part of the air outlet backflow;

[0009] When the inlet of the cleaning machine has no grain straw passing through, the baffle assembly rotates in the second direction through the transmission assembly, so that the baffle assembly opens the lower air duct.

[0010] Further, the fixing part is a fixing seat arranged on the outer side wall of the harvester.

[0011] The sensing part is rotationally connected to the fixing seat.

[0012] One end of the fixing seat away from the ground is fixed to the outer side wall of the harvester through a connecting piece; and the other end of the fixing seat close to the ground extends towards the ground and forms an extension plate.

[0013] Further, the sensing part comprises a sensing rod and a limiting seat and a rotating shaft arranged between the fixing seat and the outer side wall of the harvester.

[0014] The rotating shaft is fixedly connected to the limiting seat and rotationally connected to the fixing seat.

[0015] One end of the sensing rod is fixedly connected to the limiting seat and / or the rotating shaft, and the other end of the sensing rod extends towards the inlet of the cleaner.

[0016] A long strip-shaped limiting hole is arranged on the limiting seat, one end of the transmission assembly is arranged in the long strip-shaped limiting hole, and the other end of the transmission assembly is connected to the baffle assembly.

[0017] When the grain straws pass through the inlet of the cleaner, the sensing rod can be pressed down, so that the limiting seat rotates in the second direction; the limiting seat rotating in the second direction can drive the baffle assembly to rotate in the first direction through the transmission assembly, so as to close at least part of the downwind channel.

[0018] When there is no grain straw passing through the inlet of the cleaner, the transmission assembly drives the baffle assembly to rotate in the second direction to open the downwind channel, and can drive the limiting seat to rotate in the first direction, so that the sensing rod is lifted up.

[0019] Further, the transmission assembly comprises an elastic piece, a first transmission rod, and a second transmission rod connected to the first transmission rod at a preset angle.

[0020] The first transmission rod has at least three rotation points, the first transmission rod is arranged in the long strip-shaped limiting hole through a limiting pin at one of the rotation points, the first transmission rod is rotationally connected to the extension plate at another of the rotation points, and the first transmission rod is rotationally connected to the second transmission rod at a preset angle at the other of the rotation points.

[0021] One end of the second transmission rod away from the first transmission rod is connected to the baffle assembly; and the elastic piece is arranged between the second transmission rod and the outer side wall of the harvester.

[0022] When the induction rod is pressed down, the first transmission rod can be driven to rotate along the second direction through the rotation point, when the first transmission rod rotates along the second direction, the second transmission rod can be pulled up, and the elastic member can be stretched, so that the baffle assembly can rotate along the first direction, and the lower air duct can be closed;

[0023] When there is no grain straw passing through the inlet of the cleaning machine, the elastic member is reset, and the baffle assembly can rotate along the second direction through the transmission assembly, so that the baffle assembly can open the lower air duct.

[0024] In the above technical solution, further, the baffle assembly comprises a wind baffle and a driving shaft;

[0025] The driving shaft extends along the width direction of the harvester, and both ends thereof pass through the side walls of the harvester and are formed with bending portions, and one end of the second transmission rod away from the first transmission rod is fixedly connected with the bending portions;

[0026] The wind baffle is fixedly connected with the driving shaft, when the second transmission rod moves upward, the second transmission rod drives the driving shaft to rotate along the first direction, so that the wind baffle can rotate along the first direction and close at least part of the lower air duct.

[0027] In the above technical solution, further, the baffle assembly further comprises an auxiliary plate;

[0028] The auxiliary plate is connected with the end portions of the bending portions through a fixing member;

[0029] The second transmission rod is connected with the auxiliary plate.

[0030] In the above technical solution, further, the second transmission rod comprises a plurality of rod segments, and the rod segments are sequentially connected through an adjusting member;

[0031] By adjusting the adjusting member, the length of the second transmission rod can be changed, so as to control the angle at which the baffle assembly is opened to the lower air duct.

[0032] In the above technical solution, further, the transmission assembly further comprises a fixing plate member;

[0033] The fixing plate member is arranged on the outer side wall of the harvester and has a preset distance from the second transmission rod;

[0034] Both ends of the elastic member are connected with the second transmission rod and the fixing plate member, respectively.

[0035] In the above technical solution, further, the elastic member is a spring;

[0036] Two ends of the spring are connected to the second transmission rod and the fixed plate respectively.

[0037] The application further provides a harvester comprising the blocking air outlet backflow structure.

[0038] Compared with the prior art, the application has the following beneficial effects:

[0039] The application provides a blocking air outlet backflow structure arranged in a harvester, wherein the harvester comprises a cleaner and a dust suction fan arranged at intervals; the blocking air outlet backflow structure comprises a sensing assembly and a baffle assembly.

[0040] The sensing assembly comprises a fixed part fixed to the harvester and a sensing part rotatably connected to the fixed part and extending towards an inlet of the cleaner.

[0041] The baffle assembly is arranged at a lower air duct of the dust suction fan; the sensing assembly is connected to the baffle assembly through a transmission assembly.

[0042] When the grain straw passes through the inlet of the cleaner and presses down the sensing part, the baffle assembly is rotated in a first direction through the transmission assembly, so that the baffle assembly closes the lower air duct to block the air outlet backflow.

[0043] When the inlet of the cleaner has no grain straw passing through, the baffle assembly is rotated in a second direction through the transmission assembly, so that the baffle assembly opens the lower air duct.

[0044] In summary, the application can automatically open or close the baffle assembly according to the harvesting operation state, so as to adjust the cleaning state. Specifically, the state of the harvesting operation can be obtained through the sensing assembly, and the opening or closing of the baffle assembly can be driven through the transmission assembly. The whole structure is not only simple but also improves the operation efficiency.

[0045] The application further provides a harvester comprising the blocking air outlet backflow structure. Therefore, the harvester has all the beneficial effects of the blocking air outlet backflow structure, which will not be described in detail here. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0047] Figure 1This is a partial structural diagram of a harvester in the prior art;

[0048] Figure 2 A schematic diagram of the structure for blocking airflow recirculation provided in this application from a first-view perspective (when the baffle assembly is in a blocking state);

[0049] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0050] Figure 4 A schematic diagram of the structure for blocking airflow recirculation provided in this application from a second perspective (when the baffle assembly is in a blocking state);

[0051] Figure 5 for Figure 4 Enlarged view of point B in the image;

[0052] Figure 6 for Figure 4 Enlarged view of point C in the image;

[0053] Figure 7 A partial structural schematic diagram of the airflow blocking and backflow prevention structure provided in this application applied to a harvester from a third-view perspective (at which time the baffle assembly is in a free state);

[0054] Figure 8 for Figure 7 Enlarged view of point D in the image;

[0055] Figure 9 A partial structural schematic diagram of the blocking airflow recirculation structure provided in this application applied to a harvester from a fourth-view perspective (at which time the baffle assembly is in a blocking state);

[0056] Figure 10 for Figure 9 Enlarged view of point E in the image;

[0057] Figure 11 for Figure 9 Enlarged view of point F in the image;

[0058] Figure 12 A schematic diagram of the windbreak component in the baffle structure for blocking airflow backflow provided in this application.

[0059] The reference numerals: 1'-suction fan; 2'-cleaning fan; 3'-outlet air; 4'-return air; 1-suction fan; 2-harvester; 3-sensing assembly; 4-baffle assembly; 5-fixed part; 6-sensing part; 7-transmission assembly; 8-first direction; 9-second direction; 10-fixed seat; 11-extension plate; 12-connection plate; 13-first bearing plate; 14-lower air duct; 15-connection hole; 16-sensing rod; 17-limiting seat; 18-rotation shaft; 19-long strip limiting hole; 20-first limiting plate; 21-second limiting plate; 23-elastic member; 24-first transmission rod; 25-second transmission rod; 26-first rotation point; 27-second rotation point; 28-third rotation point; 29-limiting pin; 30-wind baffle; 31-driving shaft; 32-bent part; 33-assistant plate; 34-fixing member; 35-first rod segment; 36-second rod segment; 37-adjusting member; 38-fixing plate member; 39-dustproof plate. DETAILED DESCRIPTION

[0060] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and the

[0061] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatuses, and / or systems to those skilled in the art. Further, the description should not be construed as limiting the methods, apparatuses, and / or systems described herein to the examples presented herein. Rather, the description is intended to cover all alternatives, modifications and equivalents that can be included within the scope of the methods, apparatuses, and / or systems described herein.

[0062] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "in contact with" another element, or "covering" another element, it can be directly on, connected, coupled, in contact with, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly in contact with" or "directly covering" another element, there are no other elements interposed therebetween.

[0063] As used herein, the term "and / or" includes any one and any combination of the associated items.

[0064] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections described herein as being named the first element, component, region, layer or section can also be named the second element, component, region, layer or section without departing from the teachings of the examples.

[0065] For ease of description, spatial relationship terms, such as "on", "upper", "under", and "lower", can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as on "upper" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation based on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate re-interpretation of the spatial relationship terms used herein will be made.

[0066] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" and "contains", "containing" as used herein, list the presence of stated features, integers, operations, elements, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components and / or combinations thereof.

[0067] Variations in shapes depicted in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the drawings, but include variations in shapes that occur as a result of manufacturing processes.

[0068] Features of the examples described herein can be combined with one another in any manner within the scope of the disclosure. In addition, while examples are described herein as having various configurations, other configurations are possible according to what is understood in light of the disclosure.

[0069] Embodiment One

[0070] The application provides a blocking air outlet backflow structure to solve the technical problem that the high-pressure air flow discharged after the work of the dust suction fan 1 will backflow to the inlet of the dust suction fan 1 due to the close proximity of the inlet and the outlet of the dust suction fan 1, and that the part of impurities that have been cleaned out will re-enter the sieve box with the backflow, thereby reducing the working efficiency of the dust suction fan 1 and resulting in an unsatisfactory cleaning effect. The application is described below in combination with Figures 1-12 The blocking air outlet backflow structure is described in detail.

[0071] In this embodiment, the blocking air outlet backflow structure is arranged on the harvester 2, and the application is described in combination with Figure 2 As shown in the figure, the blocking air outlet backflow structure comprises a sensing assembly 3 and a baffle assembly 4; specifically, the sensing assembly 3 has a fixed part 5 fixed to the harvester 2 and a sensing part 6 rotationally connected to the fixed part 5 and extending towards the inlet of the cleaner; the baffle assembly 4 is arranged at the lower air duct 14 of the dust suction fan 1 (the harvester 2 has a cleaner and a dust suction fan 1 arranged at intervals), and extends along the width direction of the harvester 2; the baffle assembly 4 is connected to the sensing assembly 3 through a transmission assembly.

[0072] In the actual operation process, when the grain straws pass through the inlet of the cleaner, the grain straws will press down the sensing part 6, so that the sensing part 6 rotates and approaches the ground; when the grain straws press down the sensing part 6, that is, when the grain straws trigger the sensing part 6, the baffle assembly 4 will rotate in the first direction 8 through the transmission assembly 7, as shown in the figure, the first direction 8 herein refers to the counterclockwise direction, that is, the baffle assembly 4 will rotate in the counterclockwise direction through the transmission assembly 7, and when the baffle assembly 4 rotates in the counterclockwise direction, at least part of the lower air duct 14 will be closed to block the air outlet backflow; at this time, the baffle assembly 4 is in the blocking state in Figure 3 and Figure 2 , which solves the problem of backflow, increases the cleaning air volume, improves the air cleaning effect, and thus improves the cleanliness of the crops. Figure 3 When the inlet of the cleaner has no grain straws passing through, the baffle assembly 4 will rotate in the second direction 9 through the transmission assembly 7, as shown in the figure, the second direction 9 herein refers to the clockwise direction, that is, the baffle assembly 4 will rotate in the clockwise direction through the transmission assembly 7, so that the baffle assembly 4 opens the lower air duct 14; at this time, the baffle assembly 4 is in the free state in

[0073] and Figure 3 . Figure 7 Figure 8

[0074] ​​In summary, the application can automatically open or close the baffle assembly 4 according to the harvesting operation state (when the baffle assembly 4 is opened, the baffle assembly 4 is in a blocking state; when the baffle assembly 4 is closed, the baffle assembly 4 is in a free state), thereby adjusting the cleaning state. Specifically, the state of the harvesting operation can be obtained through the sensing assembly 3, and the opening or closing of the baffle assembly 4 can be driven through the transmission assembly 7. The whole structure is not only simple but also improves the operation efficiency.

[0075] In combination with Figure 4 and Figure 5 As shown, the fixed part 5 is a fixed seat 10 arranged on the outer side wall of the harvester 2; the sensing part 6 is rotationally connected to the fixed seat 10. Specifically, one end of the fixed seat 10 away from the ground is fixed to the outer side wall of the harvester 2 through a connecting piece; the other end of the fixed seat 10 close to the ground extends towards the ground and forms an extension plate 11.

[0076] Further, in combination with Figure 5 As shown, the fixed seat 10 includes a connecting plate 12 and a first bearing plate 13; the first bearing plate 13 is parallel to the height direction of the harvester 2, and the sensing part 6 is rotationally connected to the first bearing plate 13; the connecting plate 12 is vertically connected to one end of the first bearing plate 13 away from the ground, i.e. the connecting plate 12 is arranged on the upper edge of the first bearing plate 13, and is parallel to the width direction of the harvester 2, and is fixed to the outer side wall of the harvester 2 through a connecting piece; one end of the first bearing plate 13 away from the connecting plate 12 extends towards the ground and forms the extension plate 11, i.e. the extension plate 11 is formed on the lower edge of the first bearing plate 13.

[0077] Further, the connecting piece is a connecting bolt, and a connecting hole 15 is arranged on the connecting plate 12 along the length direction of the harvester 2, and the connecting bolt passes through the connecting hole 15 and is fixed to the outer side wall of the harvester 2. That is, the sensing assembly 3 can be fixed to the outer side wall of the harvester 2 through the connecting bolt, i.e. the sensing assembly 3 is fixed through the connecting bolt.

[0078] In combination with Figure 4 and Figure 5 As shown, the sensing part 6 includes a sensing rod 16 and a limiting seat 17 and a rotating shaft 18 arranged between the fixed seat 10 and the outer side wall of the harvester 2. Specifically, the limiting seat 17 is fixedly connected with the rotating shaft 18, and the rotating shaft 18 is rotationally connected with the fixed seat 10; one end of the sensing rod 16 is fixedly connected with the limiting seat 17 and / or the rotating shaft 18, and the other end of the sensing rod 16 extends towards the inlet of the cleaner. Specifically, a long strip-shaped limiting hole 19 is arranged on the limiting seat 17 and extends along the length direction of the limiting seat 17, one end of the transmission assembly 7 is arranged in the long strip-shaped limiting hole 19, and the other end is connected with the baffle assembly 4.

[0079] In actual operation, when the grain straw passes through the inlet of the cleaning machine, the sensing rod 16 can be pressed down, and when the sensing rod 16 is pressed down, it can drive the limiting seat 17 to rotate in the second direction 9 (the fixed seat 10 is always fixed on the harvester, so it will not rotate); when the limiting seat 17 rotates in the second direction 9, the baffle assembly 4 can be rotated in the first direction 8 by the transmission assembly 7, and at least part of the lower air duct 14 is closed.

[0080] When there is no grain straw passing through the inlet of the cleaning machine, the transmission assembly 7 drives the baffle assembly 4 to rotate in the second direction 9 to open the lower air duct 14, and can drive the limiting seat 17 to rotate in the first direction 8, so that the sensing rod 16 is lifted up.

[0081] More specifically, the limiting seat 17 includes a first limiting plate 20 and a second limiting plate 21 connected vertically; specifically, the first limiting plate 20 is vertically arranged at one end of the second limiting plate 21 away from the ground and extends towards the outer wall of the harvester 2. Further, the upper end surface of the first limiting plate 20 can act as an accommodating end surface, and the rotating shaft 18 and the end of the sensing rod 16 away from the baffle assembly 4 are arranged on the accommodating end surface.

[0082] Further, a rotating hole is formed in the first bearing plate 13, and a part of the rotating shaft 18 is fixedly arranged on the accommodating end surface and the remaining part passes through the rotating hole and can rotate in the rotating hole.

[0083] Next, taking the example that the sensing rod 16 is fixedly connected to the limiting seat 17 (i.e. the sensing rod 16 and the limiting seat 17 are fixedly connected, and the rotating shaft 18 is fixedly connected to the limiting seat 17), it will be described in more detail that when the grain straw passes through the inlet of the cleaning machine, the sensing rod 16 can be pressed down, and when the sensing rod 16 is pressed down, since the sensing rod 16 is fixedly connected to the limiting seat 17, it will drive the limiting seat 17 to rotate in the second direction 9, and at the same time the rotating shaft 18 rotates in the rotating hole and does not limit the rotation of the limiting seat 17. In addition, since one end of the transmission assembly 7 is arranged in the long strip-shaped limiting hole 19 in the limiting seat 17, when the limiting seat 17 rotates in the second direction 9, it will drive the transmission assembly 7 located in the long strip-shaped limiting hole 19 to move downward, and through the body part of the transmission assembly 7, the baffle assembly 4 can be rotated in the first direction 8 and the lower air duct 14 is closed; in addition, when there is no grain straw passing through the inlet of the cleaning machine, the transmission assembly 7 drives the baffle assembly 4 to rotate in the second direction 9 to open the lower air duct 14, and can drive the limiting seat 17 to rotate in the first direction 8, so that the sensing rod 16 is lifted up.

[0084] Further, as shown in Figure 5 Further, a dustproof plate 39 is arranged above the rotating shaft 18, and the dustproof plate 39 is fixedly connected to the connecting plate, which prevents the rotation of the rotating shaft to a certain extent.

[0085] in combination Figure 2 and Figure 3 As shown in FIG. 7, the transmission assembly 7 comprises an elastic member 23, a first transmission rod 24, and a second transmission rod 25 connected with the first transmission rod 24 at a preset angle. Preferably, the first preset angle is 110°.

[0086] In detail, in combination Figure 2 As shown in FIG. 8, and referring to Figure 9 and Figure 10 As shown in FIG. 9, the first transmission rod 24 has at least three rotation points, which are described in detail below as the first transmission rod 24 having three rotation points, i.e., a first rotation point 26, a second rotation point 27, and a third rotation point 28. The first transmission rod 24 is arranged in the long strip-shaped limiting hole 19 at the first rotation point 26 through a limiting pin 29, the first transmission rod 24 is rotationally connected with the extension plate 11 at the second rotation point 27, and the first transmission rod 24 is rotationally connected with the second transmission rod 25 at the third rotation point 28 at a preset angle.

[0087] Further, the first transmission rod 24 is rotationally connected with the second transmission rod 25 through a rotation pin shaft, and the first transmission rod 24 is also rotationally connected with the extension plate 11 at the second rotation point 27 through a rotation pin shaft.

[0088] In detail, referring to Figure 11 As shown in FIG. 10, one end of the second transmission rod 25 away from the first transmission rod 24 is connected with the baffle assembly 4, and an elastic member 23 is arranged between the second transmission rod 25 and the outer side wall of the harvester 2. Preferably, the elastic member 23 is a spring.

[0089] In actual operation, when the sensing rod 16 is pressed down, the first transmission rod 24 can be rotated along the second direction 9 through the first rotation point 26, i.e., the movement of the first transmission rod 24 can be understood as the movement of a lever, the second rotation point 27 is the fulcrum, the first rotation point is the force point, and the third rotation point is the resistance point. Therefore, when the first transmission rod 24 rotates downward along the second direction at the first rotation point, the first transmission rod 24 rotates upward along the second direction at the third rotation point, and when the first transmission rod 24 rotates upward along the second direction at the third rotation point, the second transmission rod 25 can be pulled upward, and at this time the elastic member 23 is stretched. When the second transmission rod 25 is pulled upward, the baffle assembly 4 can be rotated along the first direction 8, and the lower air duct 14 is closed.

[0090] When there is no grain straw passing through the inlet of the cleaner, the elastic member 23 is reset, and the baffle assembly 4 is rotated along the second direction 9 through the transmission assembly 7 to open the lower air duct 14.

[0091] in combinationFigure 4 and Figure 6 and refer to Figure 12 As shown, the baffle assembly 4 includes a wind deflector 30 and a drive shaft 31. The drive shaft 31 extends along the width direction of the harvester 2, and its two ends pass through the side walls of the harvester 2, forming bends 32. The end of the second transmission rod 25 facing away from the first transmission rod 24 is fixedly connected to the bends 32. The wind deflector 30 is fixedly connected to the drive shaft 31. Preferably, the bends 32 are at a 90° angle to the drive shaft 31.

[0092] In actual operation, when the second transmission rod 25 moves upward, the second transmission rod 25 drives the bending part 32 to rotate along the first direction 8. When the bending part 32 rotates along the first direction 8, since the bending part 32 is at 90° with the drive shaft 31, the wind deflector 30 will rotate along the first direction 8 and close the downdraft duct 14.

[0093] Specifically, in combination Figure 6 As shown, the baffle assembly 4 also includes an auxiliary plate 33; the auxiliary plate 33 is connected to the end of the bent portion 32 via a fastener 34; the second transmission rod 25 is connected to the auxiliary plate 33.

[0094] Furthermore, the fixing member 34 is a fixing bolt, the auxiliary plate 33 is connected to the end of the bent part 32 through the fixing bolt, and the end of the second transmission rod 25 away from the first transmission rod 24 is hinged to the auxiliary plate 33.

[0095] In this embodiment, the second transmission rod 25 further includes multiple rod segments, and the multiple rod segments are sequentially connected by the adjusting member 37; combined with Figure 4 As shown, taking the second transmission rod 25, which comprises two segments, as an example, the details are explained below. The two segments are the first segment 35 and the second segment 36. The first segment 35 and the second segment 36 are connected by an adjusting member 37, preferably an adjusting bolt. By adjusting the adjusting bolt, the distance between the first segment 35 and the second segment 36 can be changed, thereby changing the length of the second transmission rod 25. Since both ends of the second transmission rod 25 are connected to the first transmission rod and the baffle assembly 4, respectively, adjusting the length of the second transmission rod 25 can control the angle at which the baffle assembly 4 opens the downdraft duct 14. That is, in actual use, the length of the second transmission rod 25 can be adjusted according to the crop flow rate, thereby adjusting the angle at which the baffle assembly 4 opens the downdraft duct 14 to achieve a suitable cleaning airflow.

[0096] It is worth noting that the length of the second transmission rod 25 can be manually adjusted according to the working conditions to increase the machine's adaptability.

[0097] In this embodiment, further, combined with Figure 11As shown, the transmission assembly 7 further comprises a fixed plate member 38; preferably, the fixed plate member 38 is a fixed elbow. The fixed elbow is arranged on the outer wall of the harvester 2 and has a preset distance from the second transmission rod 25; the two ends of the elastic member 23 are respectively connected to the second transmission rod 25 and the fixed plate member 38.

[0098] Embodiment two

[0099] The application also provides a harvester comprising the above-mentioned air outlet backflow blocking structure. Therefore, all the beneficial effects of the air outlet backflow blocking structure are not described in detail here.

[0100] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A structure for blocking the backflow of air, provided in a harvester, the harvester having a cleaner and a suction fan arranged at intervals, characterized in that, The blocking air outlet backflow structure comprises an induction assembly and a baffle assembly; The induction assembly has a fixed part fixed to the harvester and an induction part rotationally connected to the fixed part and extending towards the inlet of the cleaner; The baffle assembly is arranged at the lower air duct of the dust suction fan; the baffle assembly is connected to the induction assembly through a transmission assembly; When the grain straw passes through the inlet of the cleaner and presses down the induction part, the baffle assembly rotates in a first direction through the transmission assembly, so that the baffle assembly closes at least part of the lower air duct to block at least part of the air outlet backflow; When the inlet of the cleaner has no grain straw passing through, the baffle assembly rotates in a second direction through the transmission assembly, so that the baffle assembly opens the lower air duct.

2. The air outlet backflow blocking structure according to claim 1, wherein The fixed part is a fixed seat arranged on the outer side wall of the harvester; The induction part is rotationally connected to the fixed seat; One end of the fixed seat away from the ground is fixed to the outer side wall of the harvester through a connecting piece; the end of the fixed seat close to the ground extends towards the ground and forms an extension plate.

3. The air outlet backflow blocking structure according to claim 2, wherein The induction part comprises an induction rod and a limiting seat and a rotating shaft arranged between the fixed seat and the outer side wall of the harvester; The rotating shaft is fixedly connected to the limiting seat and rotationally connected to the fixed seat; One end of the induction rod is fixedly connected to the limiting seat and / or the rotating shaft, and the other end of the induction rod extends towards the inlet of the cleaner; A long strip-shaped limiting hole is formed in the limiting seat, one end of the transmission assembly is arranged in the long strip-shaped limiting hole, and the other end of the transmission assembly is connected to the baffle assembly; When the grain straw passes through the inlet of the cleaner, the induction rod can be pressed down, so that the limiting seat rotates in the second direction; the limiting seat rotating in the second direction can drive the baffle assembly to rotate in the first direction through the transmission assembly to close at least part of the lower air duct; When the inlet of the cleaner has no grain straw passing through, the transmission assembly drives the baffle assembly to rotate in the second direction to open the lower air duct, and can drive the limiting seat to rotate in the first direction, so that the induction rod is lifted upwards.

4. The air outlet backflow blocking structure according to claim 3, wherein, The transmission assembly comprises an elastic piece, a first transmission rod, and a second transmission rod connected to the first transmission rod at a preset angle; The first transmission rod has at least three rotation points, one of the rotation points is arranged in the long strip-shaped limiting hole through a limiting pin, another of the rotation points is rotationally connected to the extension plate, and the remaining rotation point is rotationally connected to the second transmission rod at the preset angle; One end of the second transmission rod away from the first transmission rod is connected to the baffle assembly; the elastic piece is arranged between the second transmission rod and the outer side wall of the harvester; When the induction rod is pressed down, the first transmission rod can be rotated along the second direction through the rotation point, when the first transmission rod is rotated along the second direction, the second transmission rod can be pulled up, and the elastic member can be stretched, so that the baffle assembly can be rotated along the first direction; When there is no grain straw passing through the inlet of the cleaning machine, the elastic member is reset, and the baffle assembly is rotated along the second direction through the transmission assembly, so that the baffle assembly opens the downwind channel.

5. The air outlet backflow blocking structure according to claim 4, wherein, The baffle assembly comprises a wind baffle and a driving shaft; The driving shaft extends along the width direction of the harvester, and both ends thereof pass through the side walls of the harvester and are formed with bending portions, and one end of the second transmission rod away from the first transmission rod is fixedly connected with the bending portions. The wind baffle is fixedly connected with the driving shaft, and when the second transmission rod moves upward, the second transmission rod drives the driving shaft to rotate along the first direction, so that the wind baffle rotates along the first direction and closes at least part of the downwind channel.

6. The air outlet backflow blocking structure according to claim 5, wherein, The baffle assembly further comprises an auxiliary plate; The auxiliary plate is connected with the end portions of the bending portions through a fixing member; The second transmission rod is connected with the auxiliary plate.

7. The air outlet backflow blocking structure according to claim 4, wherein The second transmission rod comprises a plurality of rod segments, and the rod segments are sequentially connected through an adjusting member; By adjusting the adjusting member, the length of the second transmission rod can be changed to adjust the angle at which the baffle assembly is opened to the downwind channel.

8. The air outlet backflow blocking structure according to claim 4, wherein, The transmission assembly further comprises a fixing plate member; The fixing plate member is arranged on the outer side wall of the harvester and has a preset distance from the second transmission rod; Both ends of the elastic member are connected with the second transmission rod and the fixing plate member, respectively.

9. The air outlet backflow blocking structure according to claim 8, wherein, The elastic member is a spring; Both ends of the spring are connected with the second transmission rod and the fixing plate member, respectively.

10. A harvester characterized by The blocking air outlet backflow structure comprises the blocking air outlet backflow structure according to any one of claims 1-9. The blocking air outlet backflow structure comprises the blocking air outlet backflow structure according to any one of claims 1-9.

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