Impurity removing mechanism of corn harvester and fresh corn harvester

Abstract

The utility model relates to the field of corn harvesters, in particular to an impurity removing mechanism of a corn harvester and a fresh corn harvester, which comprises a gap bridge, a first elevator and a second elevator which are sequentially arranged on a rack from front to back, and a first impurity removing mechanism and a second impurity removing mechanism are further arranged on the rack. The first impurity removing mechanism is correspondingly arranged over the first elevator and used for preliminarily removing bracts and straw on corn ears, and the second impurity removing mechanism is correspondingly arranged between the first elevator and the second elevator. And the second impurity removal mechanism is used for further removing bracts and straws remained on the corn ears. The impurity cleaning effect can be improved, and the cleaning rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of corn harvester, specifically, relate to a corn harvester impurity removal mechanism and fresh corn harvester. BACKGROUND

[0002] As an important grain crop in China, corn has a large planting area and a wide range. The mechanization degree of corn harvesting is continuously deepening, the machine harvesting rate is steadily increasing, and the labor intensity is greatly reduced. The ultimate goal of corn harvesting is to obtain complete ears. However, during the harvesting process, corn ears are often mixed with a lot of bracts and broken stalks. Therefore, a cleaning device is needed to clean the harvested corn twice. After cleaning, the corn enters the grain box, and finally the corn is poured into the grain transport vehicle.

[0003] The impurity removal fan of the fresh corn harvester is a core component of the fresh corn harvester. Its cleaning effect directly affects the subsequent packaging and transportation of fresh corn during operation. Therefore, the fan should be designed to fully protect the efficient removal of impurities from fresh corn. In the existing technology, the entire vehicle's impurity removal mechanism is designed with a single fan for impurity removal, which has a low net removal rate. SUMMARY

[0004] The purpose of the utility model is to provide a corn harvester impurity removal mechanism that can improve the cleaning effect and increase the net removal rate.

[0005] Another purpose of the utility model is to provide a fresh corn harvester that can improve the cleaning effect and increase the net removal rate.

[0006] The technical solution of the utility model is as follows:

[0007] A corn harvester impurity removal mechanism includes a bridge, a first elevator, and a second elevator arranged in order from front to back on a rack. The rack also has a first impurity removal mechanism and a second impurity removal mechanism. The first impurity removal mechanism is arranged above the first elevator. The first impurity removal mechanism is used to preliminarily remove bracts and straw from corn ears. The second impurity removal mechanism is arranged between the first elevator and the second elevator. The second impurity removal mechanism is used to further remove residual bracts and straw from corn ears.

[0008] Further, the first impurity removal mechanism includes an impurity removal fan and a straw discharge pipe. The impurity removal fan includes a fan cover, a fan shaft, fan blades, a driving mechanism, and a flail assembly. The fan cover is installed on the rack. The top of the fan cover has a support seat. The fan shaft is vertically arranged in the support seat and the fan cover. The fan shaft is connected to the support seat through a bearing.

[0009] The top of the support base is provided with the driving mechanism, and the output end of the driving mechanism is connected with the fan shaft for transmission; the bottom of the fan cover is provided with an inlet corresponding to the position directly below the fan blade, the side of the fan cover is provided with an outlet, and the outlet of the fan cover is provided with the straw discharge pipe; the fan blade and the flail assembly are installed on the fan shaft from top to bottom, and the fan blade and the flail assembly are located in the fan cover, and the flail assembly is located at the inlet.

[0010] Further, the driving mechanism comprises a hydraulic motor, an upper coupling, an intermediate coupling and a one-way overrunning clutch.

[0011] The output shaft of the hydraulic motor is connected with the fan shaft for transmission through the upper coupling, the intermediate coupling and the one-way overrunning clutch in sequence.

[0012] Further, one end of the straw discharge pipe is connected with the outlet of the fan cover, and the other end is provided with a horizontal straw discharge opening and an upward straw discharge opening; the horizontal straw discharge opening and / or the upward straw discharge opening are provided with a turnover cover plate which is hinged with the straw discharge pipe.

[0013] Further, the front end of the straw discharge pipe is a straight pipe, and the rear end is an arc-shaped pipe which is downwardly bent.

[0014] The straight pipe is horizontally arranged and connected with the outlet of the fan cover, and the end of the arc-shaped pipe is a straw discharge opening which is provided with the horizontal straw discharge opening and the upward straw discharge opening.

[0015] Further, the turnover cover plate is arranged at the upward straw discharge opening and is hinged with the straw discharge pipe, and is used for opening or closing the upward straw discharge opening.

[0016] Further, the turnover cover plate is arranged at the upward straw discharge opening and is hinged with the straw discharge pipe, and is used for opening or closing the upward straw discharge opening.

[0017] Further, the turnover cover plate is arranged at the upward straw discharge opening and is hinged with the straw discharge pipe, and is used for opening or closing the upward straw discharge opening.

[0018] Further, the horizontal straw discharge opening is further provided with a gravity-type straw pressing plate which is located at the upper part of the horizontal straw discharge opening and is rotatably arranged on the rotating shaft.

[0019] Further, the first impurity removing mechanism and the second impurity removing mechanism are structurally identical.

[0020] A fresh corn harvester comprises the corn harvester impurity removing mechanism.

[0021] Compared with the prior art, the corn harvester impurity removing mechanism has the advantages that:

[0022] The corn harvester impurity removing mechanism has the advantages that: the first impurity removing mechanism can preliminarily remove the bracts and straws on the corn ears, the second impurity removing mechanism can further remove the residual bracts and straws on the corn ears, the impurity removing effect is improved, and the complete removal rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0024] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the corn harvester impurity removing mechanism of the present application;

[0025] Figure 2 Fig. 2 is a schematic diagram of the structure of the first impurity removing mechanism of the present application;

[0026] Figure 3 Fig. 3 is a schematic diagram of part of the structure of the impurity removing fan of the present application;

[0027] Figure 4 Fig. 4 is a schematic diagram of the structure on the straw discharging pipe of the present application.

[0028] In the drawings:

[0029] 1 - first elevator; 2 - bridge; 3 - first impurity removing mechanism;

[0030] 300 - impurity removing fan; 301 - fan cover; 3011 - inlet; 302 - fan shaft; 303 - fan blade; 304 - flail assembly; 305 - hydraulic motor; 306 - upper coupling; 307 - middle coupling; 308 - one-way overrunning clutch; 309 - support seat;

[0031] 310 - row of grass tubes; 311 - straight tube; 312 - curved tube; 313 - horizontal grass outlet; 314 - upward grass outlet; 315 - turnover cover plate; 316 - pull rod; 317 - pivot; 318 - grass discharge plate; 319 - turnover drive assembly; 320 - gravity-type grass presser plate;

[0032] 4 - second impurity removal mechanism; 5 - second elevator; DETAILED DESCRIPTION

[0033] To make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0035] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0036] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, and the like are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms “first”, “second”, “third”, and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms “horizontal”, “vertical”, “overhanging”, and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, “horizontal” only means that its direction is relatively more horizontal than “vertical”, and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the utility model, need explanation further, unless another explicit provision and limitation, term "arrangement", "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0039] Some embodiments of the utility model are described in detail below with reference to the drawings.In the case of no conflict, the following examples and features in examples can be combined with each other.

[0040] Example 1

[0041] Reference Figures 1-4 The embodiment provides a corn harvester impurity removing mechanism, which comprises a bridge 2, a first elevator 1 and a second elevator 5 arranged on a rack in sequence from front to back, and a first impurity removing mechanism 3 and a second impurity removing mechanism 4 are further arranged on the rack, the first impurity removing mechanism 3 is arranged above the first elevator 1, the first impurity removing mechanism 3 is used for preliminarily removing bracts and straws on corn ears, and the second impurity removing mechanism 4 is arranged between the first elevator 1 and the second elevator 5, and the second impurity removing mechanism 4 is used for further removing residual bracts and straws on the corn ears.

[0042] In the embodiment, the first impurity removing mechanism 3 and the second impurity removing mechanism 4 are the same in structure (for example, Figure 2 ), and the structure of the first impurity removing mechanism 3 is described below.

[0043] Specifically, the first impurity removing mechanism 3 comprises an impurity removing fan 300 and a straw discharge pipe 310, the impurity removing fan 300 comprises a fan cover 301, a fan shaft 302, fan blades 303, a driving mechanism and a flail assembly 304, the fan cover 301 is installed on the rack, a support seat 309 is arranged at the top of the fan cover 301, the support seat 309 is used for installing the driving mechanism, the fan shaft 302 is vertically arranged in the support seat 309 and the fan cover 301, and the fan shaft 302 is rotationally connected with the support seat 309 through a bearing.

[0044] The top of the support base 309 is provided with a driving mechanism, and the output end of the driving mechanism is connected with the fan shaft 302 for transmission. The bottom of the fan cover 301 is provided with an inlet 3011 corresponding to the position directly below the fan blades 303, and the side of the fan cover 301 is provided with an outlet. The outlet of the fan cover 301 is provided with a straw discharge pipe 310. The fan blades 303 and the flail assembly 304 are installed on the fan shaft 302 from top to bottom. The fan blades 303 and the flail assembly 304 are located in the fan cover 301, and the flail assembly 304 is located at the inlet 3011. The fan shaft 302, the fan blades 303 and the flail assembly 304 installed on the fan shaft 302 are driven to rotate by the driving mechanism. After the fan blades 303 rotate, a strong suction force is generated to suck the bracts and straws and other sundries on the first elevator 1 upwards. The sucked bracts and straws and other sundries will first pass through the flail assembly 304 at the inlet 3011 of the sundry removal fan 300, be chopped by the flail assembly 304, and then be discharged from the straw discharge pipe 310.

[0045] In this embodiment, the driving mechanism includes a hydraulic motor 305, an upper coupling 306, an intermediate coupling 307 and a one-way overrunning clutch 308.

[0046] As Figure 3 The output shaft of the hydraulic motor 305 is connected with the fan shaft 302 for transmission in sequence through the upper coupling 306, the intermediate coupling 307 and the one-way overrunning clutch 308. The hydraulic motor 305 is linearly driven, and finally the torque is transmitted by the one-way overrunning clutch 308. When the hydraulic motor 305 stops, the linear stop is also realized by the one-way overrunning clutch 308, so as to control the sundry removal fan 300 to remove sundries, thereby maximizing the guarantee that the harvested fresh corn ears are free of other sundries. In addition, the hydraulic motor 305 can be speed-adjusted according to actual conditions. This scheme has high fault tolerance and high feasibility.

[0047] Then, the structure on the straw discharge pipe 310 will be described as follows:

[0048] One end of the straw discharge port is connected with the outlet of the fan cover 301, and the other end is provided with a horizontal straw discharge port 313 and an upward straw discharge port 314. The horizontal straw discharge port 313 and / or the upward straw discharge port 314 are provided with a turnover cover plate 315. The turnover cover plate 315 is hinged with the straw discharge pipe 310. The opening and closing of the horizontal straw discharge port 313 and / or the upward straw discharge port 314 are realized by turning over the turnover cover plate 315.

[0049] Specifically, the front end of the straw discharge pipe 310 is a straight pipe 311, and the rear end is an arc-shaped pipe 312 which is downwardly bent.

[0050] Among them, the straight pipe 311 is horizontally arranged and connected with the outlet of the fan cover 301. The end of the arc-shaped pipe 312 is a straw discharge port. The horizontal straw discharge port 313 and the upward straw discharge port 314 are arranged at the straw discharge port.

[0051] Specifically, the turnover cover plate 315 is arranged at the updraft grass outlet 314, and the turnover cover plate 315 is hinged with the grass outlet pipe 310 for opening or closing the updraft grass outlet 314.

[0052] The grass outlet pipe 310 is further provided with a grass outlet plate 318, a pull rod 316 and a rotating shaft 317 (as shown in Figure 4 wherein the grass outlet plate 318 and the pull rod 316 are shown by dashed lines), one end of the turnover cover plate 315 close to the fan cover 301 is a first end, and the other end away from the fan cover 301 is a second end, the first end of the turnover cover plate 315 is hinged with the grass outlet pipe 310 through a hinge seat, the second end of the turnover cover plate 315 is hinged with the upper end of the pull rod 316 through the rotating shaft 317, the grass outlet plate 318 is arranged at the bottom inside the arc-shaped pipe 312, the lower end of the pull rod 316 is hinged or fixedly connected with one end of the grass outlet plate 318, and the other end of the grass outlet plate 318 is hinged with the arc-shaped pipe 312;

[0053] The grass outlet pipe 310 is further provided with a turnover driving assembly 319, the turnover driving assembly 319 can adopt a hydraulic cylinder, an electric push rod, a telescopic air cylinder or a linear motor, the output end of the turnover driving assembly 319 is directly connected with the turnover cover plate 315 or connected and driven through a transmission assembly, and the turnover driving assembly 319 is used to drive the turnover cover plate 315, the pull rod 316 and the grass outlet plate 318 to turn over together. Preferably, the turnover driving assembly 319 adopts a hydraulic cylinder, and the turnover cover plate 315 and the grass outlet plate 318 are driven by the driving action of the hydraulic cylinder, so as to adjust the grass outlet angle (horizontal grass outlet or updraft grass outlet).

[0054] The horizontal grass outlet 313 is further provided with a gravity type grass pressing plate 320, and the gravity type grass pressing plate 320 is located at the upper part of the horizontal grass outlet 313 and is rotatably installed on the rotating shaft 317.

[0055] In the horizontal grass outlet state, the piston rod of the hydraulic cylinder is extended, so that the turnover cover plate 315 closes the updraft grass outlet 314, the grass outlet plate 318 falls on the inner wall of the arc-shaped pipe 312, and the plate surface of the grass outlet plate 318 tends to be horizontal, the weeds discharged from the outlet of the weed removing fan 300 pass through the grass outlet plate 318 and are discharged from the horizontal grass outlet 313, and the gravity type grass pressing plate 320 can realize the grass pressing function by virtue of its own gravity.

[0056] In the updraft grass outlet state, the piston rod of the hydraulic cylinder is retracted, the second end of the turnover cover plate 315 is upwardly tilted to open the updraft grass outlet 314, and the pull rod 316 and the grass outlet plate 318 are lifted, the grass outlet plate 318 forms an uphill structure after being lifted, the weeds discharged from the outlet of the weed removing fan 300 pass through the uphill of the grass outlet plate 318 and are discharged from the updraft grass outlet 314, the bract leaf updraft function is realized, the discharged bract leaves are more evenly dispersed, and the weed removal situation can be more directly observed.

[0057] It should be noted that the pull rod 316 can be designed as two, and arranged on both sides of the turnover cover plate 315, and the turnover cover plate 315 is hinged to the straw discharge plate 318 through the shaft 317 and the two pull rods 316. The upper end of the pull rod 316 is provided with a through hole, and the shaft 317 is arranged in the through hole. The limiting parts are arranged on the shaft 317 and on both sides of the pull rod 316, which can realize the axial limiting of the pull rod 316 without affecting the rotation of the pull rod 316.

[0058] The overall power of the impurity removal fan 300 is provided by a hydraulic motor 305, and the torque is transmitted to the fan blade 303 through the upper shaft 306, the intermediate shaft 307 and the one-way overrunning clutch 308 for impurity removal. The advantage of this design is that the rotation speed of the fan blade 303 can be adjusted at any time on the vehicle by the hydraulic motor 305. When the hydraulic motor 305 is started, the torque is transmitted to the one-way overrunning clutch 308, and the one-way overrunning clutch 308 drives the fan blade 303. When the vehicle stops working, the hydraulic motor 305 stops instantaneously, and the fan blade 303 stops linearly slowly under the action of the one-way overrunning clutch 308. In the prior art, since the start and stop of the impurity removal fan 300 are nonlinear, the failure rate and maintenance rate are high, the device cannot work continuously for a long time, and the efficiency is low. In view of this, the technical scheme of the present application can solve this problem well.

[0059] Embodiment 2

[0060] A fresh corn harvester, comprising the corn harvester impurity removal mechanism.

[0061] Overall working principle:

[0062] When the fresh corn harvester starts working, the corn ears are picked up by the cutting table, and a part of the corn ears still carry straws and bracts. When the corn ears are transported from the bridge 2 to the first elevator 1, the first impurity removal mechanism 3 starts to remove impurities. The corn ears with bracts and straws are sent out from the end of the bridge 2, and the straw corn and ear mixture is separated by the straw roller. Most of the fallen straws and bracts move upward under the suction of the impurity removal fan 300 in the first impurity removal mechanism 3. These straws and bracts are first cut by the flail assembly 304 at the bottom of the first impurity removal mechanism 3, and then discharged by the straw discharge pipe 310. The corn ears after the impurity removal of the first impurity removal mechanism 3 still carry a small amount of straws or bracts. These ears and bracts are transported upward with the first elevator 1. When reaching the middle of the first elevator 1 and the second elevator 5, the second impurity removal mechanism 4 starts to remove impurities, and the bracts or straws not removed by the first impurity removal mechanism 3 are removed again. The bracts or straws are cut by the flail assembly 304 at the bottom of the second impurity removal mechanism 4, and then removed to ensure that the corn ears are clean and enter the grain bin.

[0063] The beneficial effects of the technical scheme of the utility model are:

[0064] 1. On the basis of the single impurity removing fan in the prior art, the application adds a secondary impurity removing mechanism, wherein the first impurity removing mechanism 3 serves as a primary impurity removing mechanism and can preliminarily remove the bracts and straws on the corn ears, the second impurity removing mechanism 4 serves as a secondary impurity removing mechanism and can further remove the residual bracts and straws on the corn ears, thereby improving the impurity removing effect and the net removal rate;

[0065] 2. The output shaft of the hydraulic motor 305 is connected and driven with the fan shaft 302 through the upper coupling 306, the intermediate coupling 307 and the one-way overrunning clutch 308 in sequence, the hydraulic motor 305 is linearly driven, and finally the one-way overrunning clutch 308 transmits the torque, the hydraulic motor 305 is linearly stopped by the one-way overrunning clutch 308 when it stops, thereby controlling the impurity removing fan 300 to remove the impurities, maximally ensuring that the harvested fresh corn ears are free of other impurities, and the hydraulic motor 305 can be speed-adjusted according to the actual situation, the scheme has high fault tolerance and high feasibility; and since the start and stop of the impurity removing fan 300 are linear, the failure rate and the maintenance rate are low, the impurity removing fan 300 can work continuously for a long time, and the working efficiency is high;

[0066] 3. The turning driving assembly 319 is designed on the straw removing pipe 310 to drive the lifting and falling of the turning cover plate 315 and the straw removing plate 318, adjust the straw removing angle, and realize the horizontal straw removing or upward straw removing function.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, rather than limit it; although the utility model 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 scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model.

[0068] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, and those skilled in the art can make various changes and changes to the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A corn harvester cleaning mechanism comprising a bridge (2), a first elevator (1) and a second elevator (5) arranged in order from front to rear on a frame, characterized in that, The frame is also provided with a first impurity removing mechanism (3) and a second impurity removing mechanism (4), the first impurity removing mechanism (3) is arranged above the first elevator (1) and is used for preliminarily removing bracts and straws on the corn ears, and the second impurity removing mechanism (4) is arranged between the first elevator (1) and the second elevator (5) and is used for further removing the bracts and straws on the corn ears.

2. The corn harvester cleaning mechanism of claim 1, wherein, The first impurity removing mechanism (3) comprises an impurity removing fan (300) and a straw discharging pipe (310), the impurity removing fan (300) comprises a fan cover (301), a fan shaft (302), fan blades (303), a driving mechanism and a flail assembly (304), the fan cover (301) is installed on the frame, a support seat (309) is arranged on the top of the fan cover (301), the fan shaft (302) is vertically arranged in the support seat (309) and the fan cover (301), and the fan shaft (302) is rotationally connected with the support seat (309) through a bearing; The driving mechanism is arranged on the top of the support seat (309), an output end of the driving mechanism is connected with the fan shaft (302) for transmission, an inlet (3011) is arranged on the bottom of the fan cover (301) and below the fan blades (303), an outlet is arranged on the side of the fan cover (301), the straw discharging pipe (310) is arranged at the outlet of the fan cover (301), the fan blades (303) and the flail assembly (304) are installed on the fan shaft (302) from top to bottom, the fan blades (303) and the flail assembly (304) are located in the fan cover (301), and the flail assembly (304) is located at the inlet (3011).

3. The corn harvester cleaning mechanism of claim 2, wherein, The driving mechanism comprises a hydraulic motor (305), an upper shaft coupling (306), an intermediate shaft coupling (307) and a one-way overrunning clutch (308). An output shaft of the hydraulic motor (305) is connected with the fan shaft (302) for transmission through the upper shaft coupling (306), the intermediate shaft coupling (307) and the one-way overrunning clutch (308) in sequence.

4. The corn harvester cleaning mechanism of claim 2, wherein, One end of the straw discharging pipe (310) is connected with the outlet of the fan cover (301), the other end is provided with a horizontal straw discharging opening (313) and an upward straw discharging opening (314), the horizontal straw discharging opening (313) and / or the upward straw discharging opening (314) are provided with a turnover cover plate (315), and the turnover cover plate (315) is hinged with the straw discharging pipe (310).

5. The corn harvester cleaning mechanism of claim 4, wherein, The front end of the straw discharging pipe (310) is a straight pipe (311), and the rear end is an arc-shaped pipe (312) which is downwardly bent; The straight pipe (311) is horizontally arranged and connected with the outlet of the fan cover (301), and the end of the arc-shaped pipe (312) is a straw discharging opening, the horizontal straw discharging opening (313) and the upward straw discharging opening (314) are arranged at the straw discharging opening.

6. The corn harvester cleaning mechanism of claim 5, wherein, The updraft grass discharging port (314) is provided with a turnover cover plate (315) at the corresponding position, the turnover cover plate (315) is hinged with the grass discharging pipe (310) and is used for opening or closing the updraft grass discharging port (314).

7. The corn harvester cleaning mechanism of claim 6, wherein, The turnover cover plate (315) is provided with a grass discharging plate (318), a pull rod (316) and a rotating shaft (317), one end of the turnover cover plate (315) near the fan cover (301) is a first end, one end of the turnover cover plate (315) far from the fan cover (301) is a second end, the first end of the turnover cover plate (315) is hinged with the grass discharging pipe (310) through a hinge seat, the second end of the turnover cover plate (315) is hinged with the upper end of the pull rod (316) through the rotating shaft (317), the grass discharging plate (318) is arranged at the bottom of the arc-shaped pipe (312), the lower end of the pull rod (316) is hinged with one end of the grass discharging plate (318), the other end of the grass discharging plate (318) is hinged with the arc-shaped pipe (312); The grass discharging pipe (310) is further provided with a turnover driving assembly (319), the output end of the turnover driving assembly (319) is connected with the turnover cover plate (315) and is used for driving the turnover cover plate (315), the pull rod (316) and the grass discharging plate (318) to turn over together.

8. The corn harvester cleaning mechanism of claim 7, wherein, The horizontal grass discharging port (313) is further provided with a gravity type grass pressing plate (320), the gravity type grass pressing plate (320) is located at the upper part of the horizontal grass discharging port (313) and is rotatably arranged on the rotating shaft (317).

9. The corn harvester cleaning mechanism of claim 1, wherein, The first impurity removing mechanism (3) and the second impurity removing mechanism (4) have the same structure.

10. A machine for harvesting fresh corn, characterized in that, The corn harvester impurity removing mechanism comprises the corn harvester impurity removing mechanism according to any one of claims 1-9.

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