Harvester air supply screening system

Abstract

The present invention discloses an air supply and screening system for a harvester. Aiming at the problem that the prior art cannot separate rice and rice husks finely by controlling the air intake volume by adjusting the fan speed, resulting in that the separation adjustment is very cumbersome and it is difficult to maintain a stable screening rate, the present invention provides the following technical scheme, including a frame, a fan casing connected to the frame, a bearing base plate fixedly connected to the frame, and a vibrating mesh screen and an adjusting mesh screen installed in the frame. The frame is provided with two augers at the bearing base plate, and also includes a fan assembly installed in the fan casing by the frame and an air guide assembly installed on the fan casing. At the same time, a fan with adjustable air supply volume is provided, and an air guide structure with electronically controlled change of wind direction and flow rate is provided, so as to meet the technical requirements of controllable wind-driven separation of rice grains and rice husks. The present scheme has the advantages of controllable air supply volume, scalarized air supply and stable structure.

Description

Technical Field

[0001] The present invention relates to the field of harvester equipment, and more particularly to an air supply screening system for a harvester. Background Art

[0002] An agricultural harvester is a combined machine for harvesting crops. It refers to a harvesting device that can complete the processes of harvesting, separating, separating stems, and removing debris and residues of grain crops in one go. The existing harvesters separate the separated grains and stems through a vibrating screen structure. As the separation amount increases, the vibrating screen separation method is highly dependent on the harvester frame. The vibrating screen area affects the separation efficiency. Existing large agricultural harvesters are equipped with air blowers to improve sorting efficiency.

[0003] Currently, a Chinese patent application numbered 202011616074.X discloses a harvester air supply system, which includes a fan, an air supply channel, a tail hood, and a flow blocker. In the vertical direction, the height of the discharge port is higher than the height of the air outlet, and the air outlet is tilted toward the discharge port. The fan housing, grain bottom shell, residual bottom shell, and screen frame are tilted from one side of the air outlet toward the discharge port and gradually increased in height. A first air inlet connected to the outside world is provided at each end of the fan housing. A second air inlet is provided along its circumference on the side wall opposite to the air outlet in the middle of the fan housing. Air is supplied through three air inlets evenly distributed on the fan housing, making the air volume in the fan uniform and stable. The air outlet is gradually increased in height toward the discharge port to improve fluidity, and a flow blocker is installed on the tail hood to guide the supply air toward the discharge port, preventing return air from entering the threshing system and screening system and affecting the cleanliness of the crop. The air supply system has a compact and stable structure, sufficient air volume, and no return air influence, which greatly improves the air separation efficiency.

[0004] Although this harvester air supply system can meet the air separation efficiency of harvesting and recycling to a certain extent, the crops harvested by today's combine harvesters have different particle quality and size, such as the particle diameters of sesame and rice are quite different. Since the air supply volume has different supporting effects on crop particles and detached rice husks, it is necessary to control the air volume of the air supply device to a certain extent. The existing technology controls the air intake volume by adjusting the fan speed, but the air supply volume and the position of the air supply duct need to be adjusted before they can be used to screen different grains. The existing adjustment method is only to adjust the air supply volume, and the supporting effect of the generated air volume on the grains cannot be refined, resulting in the separation adjustment being very cumbersome and difficult to maintain a stable screening rate. Therefore, there is room for improvement. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a harvester air supply screening system, which has the advantages of controllable air supply volume, scalar air supply and stable structure.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The harvester air supply screening system includes a frame, a fan casing connected to the frame, a bearing base fixedly connected to the frame, and a vibrating mesh screen and an adjusting mesh screen installed in the frame, the fan casing is provided with an air supply port, and the frame is provided with two augers at the bearing base, and is characterized in that it also includes a fan assembly installed in the fan casing by the frame and an air guide assembly installed on the fan casing, an adjustment plate is slidably connected in the fan assembly, and the adjustment plate structure changes the windshield area of ​​the fan assembly through sliding motion, the air guide assembly is provided with a plurality of ventilation holes and is provided with a wind blocking plate covering some of the ventilation holes, the air guide assembly is arranged obliquely at the air supply port, and the frame is rotatably connected with a movable baffle at a position of the bearing base close to the air supply port.

[0008] By adopting the above technical solution, the fan is structurally modified on the basis of the existing air supply device, wherein an adjustment plate for adjusting the windshield area is provided on the fan assembly, so that the fan assembly drives a smoother flow of air at the same speed, and the effect on the grains and rice husks is adjusted by adjusting the air flow of the fan part. An air supply port is provided on the fan casing, and the flowing gas generated by the fan assembly is blocked by the guide air plate installed on the fan casing through the air supply port. The wind guide assembly structure divides the flowing airflow into airflow beams and aggregates them into swirling vortices through the wind blocking plates at different heights of the ventilation holes, thereby achieving the purpose of controlling the air supply range. It produces a more precise airflow control effect, so that the frame has a good circulation flow structure at the position of the air supply hole and the adjustment screen. The movable baffle set on the frame guides the grains falling from the adjustment screen into the recovery area, and the lighter husks are restricted on the movable baffle, and the cleaning operation is performed by increasing the blowing volume. The above structure is provided with an adjustable fan component and an adjustment screen, and cooperates with the air guide component to fully separate the grains and rice husks falling into the adjustment screen, thereby increasing the separation ability of different particle sizes, achieving the technical effect of separating grains of different particle sizes, and has the advantages of controllable air supply volume, scalar air supply, and stable structure.

[0009] Furthermore, the fan assembly includes a rotating shaft rotatably connected to the frame, an adjustment shaft sleeved on the rotating shaft, and a fan plate fixedly connected to the rotating shaft. The adjustment shaft is connected to the frame by a thread. The fan plate is provided with a connecting cavity and the adjustment plate is slidably connected in the cavity. The adjustment plate is installed on the adjustment shaft.

[0010] By adopting the above technical solution, the fan assembly adopts a sleeve shaft structure, wherein an adjustment shaft is connected to the rotating shaft, the adjustment shaft rotates with the rotating shaft and is connected to the frame through a thread, and the sliding connection adjustment plate is adjusted by adjusting the thread. The adjusted adjustment plate structure increases the axial windshield area of ​​the fan plate, and it is slidingly connected to the fan plate, so that it has the technical effect of real-time adjustment of the windshield area of ​​the fan assembly. The above structure provides a fan assembly structure with real-time adjustment, stable structure and simple operation.

[0011] Furthermore, a blast barrel is installed on the other side of the fan housing where the air outlet is opened. The blast barrel is a bent structure and the bent end opening is arranged vertically.

[0012] By adopting the above technical solution, the air supply performance of the fan assembly is increased through the blower, and the structure of the blower barrel has the effect of improving structural stability and maintaining stable wind pressure. It is useful for maintaining the uniformity of the flow pattern in the fan casing and preventing wind deviation caused by circumferential flow interfering with the flow gas transported by the fan. The above structure provides a component for improving the air supply performance, which has the technical effect of maintaining the stability of the flow gas of the fan assembly.

[0013] Furthermore, the wind guide assembly includes a wind guide plate fixedly connected to the fan housing, the wind guide plate is provided with an adjustment motor and a threaded rod connected to the adjustment motor, and the wind blocking plate is slidably connected to the wind guide plate and connected to the threaded rod.

[0014] By adopting the above technical solution, the guide air plate is arranged obliquely at the air supply hole, which can integrate the flow airflow generated by the fan assembly into the required fluid vortex to support the chaff and separate the grains and chaff. The guide air plate adjusts the air blocker covering the ventilation hole by setting an adjustment motor bar with real-time locking and stable transmission. The air blocker structure can slide stably on the guide air plate. The above structure provides a stable and reliable air blocker transmission structure.

[0015] Furthermore, the end of the wind guide plate is fixedly connected to a vibration plate, and a through slot is provided at the connection between the end of the wind guide plate and the vibration plate, and the opening angle between the through slot and the vibration plate is 13°.

[0016] By adopting the above-mentioned technical solution, the guide wind plate structure generates a stable vibration frequency at the connection with the supporting base plate through the partially connected vibration plate, which has the technical effect of improving the vibration performance. The shape of the through groove has the effect of reducing the vibration frequency, so that the vibration generated will not affect the operation and connection structure of the surrounding structure, which has the technical effect of improving structural stability and increasing the vibration cleaning function.

[0017] Furthermore, the regulating mesh screen is rotatably connected to the upper side of the frame away from the bearing base plate, and its rotating end is arranged on the side close to the air outlet. The rotating end of the regulating mesh screen is connected to a swing motor that drives it to rotate.

[0018] By adopting the above technical solution, the adjusting mesh screen is located above the air supply port and arranged horizontally. A connecting end is provided on the side close to the air supply port, and its rotation angle is controlled by a swing motor, which greatly improves the operating stability of the adjusting mesh screen. The above structure provides an adjusting mesh screen transmission structure with a stable connection adaptability to cooperate with the fan assembly and the air guide assembly to increase the accuracy of screening.

[0019] Furthermore, the auger includes a grain auger arranged on a side close to the air supply port and a husk auger arranged on a side away from the air supply port, and the above auger structures are both connected to a motor for driving the rotation thereof.

[0020] By adopting the above technical solution, by setting the augers as two types at different distances relative to the air supply port, according to the blowing volume and the quality of the separated material, the larger grains can fall into the grain auger, and the lighter rice husks can be sent to the farther husk auger through the blowing operation. The above structure provides a separation and conveying structure after the screening is completed.

[0021] Furthermore, the movable baffle is arranged between the grain auger and the chaff auger and its adjustment angle range is between 0 and 20 degrees.

[0022] Using the above technical solution, a transmission auger for separating and transporting different materials is installed in the arc trough. Therefore, a movable baffle structure is set between the arc troughs to increase the screening threshold function, that is, the rotatable movable baffle is adjusted to reach a certain slope, so that part of the rice husks can pass through the movable baffle to reach the transmission auger away from the fan assembly and enter the next process flow, which has the advantage of further controlling the accuracy of separation of grains and rice husks and improving separation efficiency.

[0023] Furthermore, a flexible baffle is provided at one end of the movable baffle away from the rotating end, the other end of the flexible baffle is fixedly connected to the supporting base plate, and a limiting rod is provided on the side of the flexible baffle away from the movable baffle of the frame.

[0024] By adopting the above technical solution, during the rotation of the movable baffle, the other end away from the rotating end is blocked due to the rice floating into the gap generated by the rotation. If it is designed as a through-hole structure, the rice husks will fall into the area where the grains are separated. Therefore, in order to prevent the above situation from occurring, a flexible baffle connected to the supporting bottom plate is provided at one end of the movable baffle. In order to prevent the flexible baffle from folding outward and affecting the sorting accuracy, the movable range of the flexible baffle is limited by a limit rod. The above structure provides a structure to prevent the backflow of rice husks, and the flexible baffle also has the technical effect of preventing the generation of negative pressure.

[0025] Furthermore, a bearing plate is arranged obliquely on the adjusting mesh screen, and the rotation angle of the adjusting mesh screen is 15°.

[0026] By adopting the above technical solution, a size screening structure is added when filtering rice and husks through a supporting plate, so that independent bodies of rice and husks with large size differences are separated and retained on the adjustable screen. The adjustment distance is determined by the rotation angle of the adjustable screen. A larger rotation angle makes it difficult for grains of suitable size to fall into the lower area, so it is set at about 15° to ensure the stability of separation and maintain a certain adjustment performance.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. The air supply screening mechanism is provided with a fan assembly with infinitely adjustable windshield area. Under the condition of maintaining the same transmission power, the effect of controlling the circulating air volume is achieved by adjusting different windshield areas, and an air guide plate is provided to integrate the flowing air of the fan assembly. The air guide plate, through the ventilation holes opened and the wind block plate structure provided, makes the flowing air produce a stable periodic air fluid, thereby meeting the technical requirements for fluid screening and separation. The adjustable adjustment screen and movable baffle are provided to adjust the screening and separation environment of rice grains and rice husks, so that the flowing air can stably act on the grains and rice husks placed on the adjustment screen and movable baffle. The above structure has the advantages of improving the controllability of the air supply system, enhancing the controllable air supply volume, scalarizing the air supply, and having a stable structure.

[0029] 2. This mechanism is equipped with an adjustable range for the mesh screen and movable baffle to coordinate with the fan assembly in separating different types of rice grains from husks. The adjustable mesh screen serves as the main adjustment structure, and the setting range needs to be selected according to the specific type of grain, thereby setting the most suitable tilt angle. The movable baffle serves as a compensating screening structure, and the adjustment range is set to adapt to the tilt angle of different masses. This solution has the technical effect of refining the adjustment scheme of each component and improving separation efficiency.

[0030] 3. In this mechanism, a flexible baffle is provided on one side of the movable baffle, which cooperates with the conveying auger arranged on the bearing bottom plate. The flexible baffle covers the trumpet-shaped space generated by the movable baffle during rotation, so that it does not affect the overall adjustment and does not generate negative pressure wind. It has the advantages of preventing rice husk backflow and improving air supply adjustability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of this embodiment with part of the body shell removed;

[0032] Figure 2 This is a front view of the structure of this embodiment with part of the body shell removed;

[0033] Figure 3 Schematic diagram of the structure of the fan assembly of this embodiment;

[0034] Figure 4 is a structural cross-sectional view of the fan assembly of this embodiment;

[0035] Figure 5 Schematic diagram of the structure of the air guide assembly of this embodiment.

[0036] In the figure: 1. frame; 11. bearing base; 12. grain auger; 121. grain motor; 13. husk auger; 131. husk motor; 14. limit rod; 2. adjustment screen; 21. bearing plate; 22. swing motor; 3. vibration screen; 4. fan housing; 41. shock-absorbing plate; 42. blower barrel; 43. fixing plate; 44. air outlet; 5. fan assembly; 51. rotating shaft; 52. fan plate; 53. adjustment plate; 54. adjustment shaft; 541. rotating handle; 55. pulley; 6. air guide assembly; 60. guide air plate; 601. rotating seat; 602. feed screw; 603. sliding groove; 604. through slot; 61. adjustment motor; 62. wind blocker; 63. ventilation hole; 64. vibration plate; 7. movable baffle; 71. adjustment handle; 72. flexible baffle. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0039] The harvester air supply and screening system is a screening mechanism that is equipped with a fan with adjustable air supply volume, an air guide structure that electronically controls the wind direction and flow rate, and a variety of adjustable baffles to match the flowing air, thereby achieving the technical requirements of controllable wind-driven separation of grains and rice husks.

[0040] refer to Figure 1 、 Figure 2 As shown, the present invention provides an embodiment, which includes a frame 1, the frame 1 is a rectangular frame structure and is made of metal material, the frame 1 has good mechanical strength and a vibrating screen 3 is installed on one side above the frame 1, the vibrating screen 3 is a rectangular frame structure and both ends are fixedly connected to the frame of the frame 1, the vibrating screen 3 is used to receive rice from above, the frame 1 is internally installed with a bearing base 11, the bearing base 11 is fixedly connected to the frame 1, the bearing base 11 is a wavy rectangular metal plate, on which two arc-shaped concave The frame 1 is provided with a slot, and an auger is installed therein. The end of the frame 1 on which the vibration screen 3 is installed is connected to the fan housing 4 through a fastener. The fan housing 4 is a hollow barrel structure. The fan housing 4 is provided with circular through holes on both sides, and an air outlet 44 is provided at a position facing the interior of the frame 1. A fan assembly 5 is also installed in the fan housing 4 in the frame 1, wherein the fan assembly 5 is rotatably connected to the frame 1, and an adjustment plate 53 for adjusting the windshield area of ​​the fan assembly 5 is provided in the fan assembly 5. The adjustment plate 53 is installed on the rotating shaft 51 of the fan assembly 5 and can rotate along the rotation axis 51. The driving shaft 51 moves in the direction of the driving shaft 51, and the wind-blocking area of ​​the fan assembly 5 in the axial direction is increased by moving. The horizontal radial direction of the installation position of the fan assembly 5 is opposite to the air outlet 44 opened by the fan housing 4. The air outlet 44 is rectangular and smaller than the radial cross-sectional size of the fan. The fan housing 4 is equipped with an air guide assembly 6 above the air outlet 44 by fasteners and welding. The air guide assembly 6 is a rectangular plate-shaped structure and is arranged obliquely on one side of the air outlet 44. The end of the air guide assembly 6 abuts against the bearing bottom plate 11; the frame 1 is provided with a long linear arrangement at the bottom The supporting base plate 11 is opposite to the air supply port 44. The supporting base plate 11 is arranged parallel to one end of the air supply port 44 and its end is connected to the fan casing 4. The frame 1 is provided with an adjustment screen 2 parallel to the upper side of the supporting base plate 11. The adjustment screen 2 is located below the vibrating screen 3 and the vibrating screen 3 covers part of the adjustment screen in the horizontal direction. The air supply port 44 opened in the fan casing 4 is opposite to the gap between the adjustment screen and the supporting base plate 11, so that the flow airflow generated by the fan assembly 5 can directly act on the grains and rice husks on the adjustment screen 2 and the supporting base plate 11.

[0041] refer to Figure 3 、 Figure 4As shown, the fan assembly 5 includes a rotating shaft 51 that is rotatably connected to the frame 1, and a fan plate 52 fixedly connected to the rotating shaft 51. The fan plate 52 is a cross-shaped structure with a connecting slot, in which the aforementioned adjustment plate 53 is connected. The adjustment plate 53 is the same shape as the fan plate 52 but smaller in size. The adjustment plate 53 is fixedly connected to an adjustment shaft 54, which has a connecting slot structure that allows the fan plate 52 to be fixedly connected to the rotating shaft 51. The frame 1 is provided with fixed plates 43 on both sides of the fan assembly 5, and the fan housing 4 is provided with inner lining plates on both sides. The fixed plates 43 are clamped and connected between the branch housing and the inner lining plates by fasteners. The adjustment shaft 54 ​​is connected to the fixed plates 43 by threads. A rotating handle 541 is installed on one side. The rotating shaft 51 is connected to a pulley 55 at the other end. The pulley 55 is connected to an external motor to provide power to the fan assembly 5. The adjustment shaft 54 ​​is sleeved on the rotating shaft 51 and can rotate with the rotating shaft 51 due to the slots provided therein.

[0042] refer to Figure 1 、 Figure 2 , the fan housing 4 is equipped with a blast duct on the other side of the air supply port 44. The blast duct is a bent barrel structure, and the air inlet is arranged in the vertical direction. The above structure can effectively control and provide a stable air supply to achieve the technical effect of stable air supply; the adjustable screen 2 is a frame structure, on which a bearing plate 21 is arranged obliquely. The bearing plate 21 is rotatably connected to the adjustable screen 2 and is connected in series through a dynamic connecting rod. By adjusting the dynamic connecting rod, the rotation angle of the bearing plate 21 in the entire adjustable screen 2 can be changed at one time, so as to adapt to the separation of grains of different particle sizes. The hinged end of the adjustable screen 2 is arranged on the side close to the guide air plate 60. The frame 1 is provided with a 15° moving range slide at the other end of the adjustable screen 2. The adjustable screen 2 runs in the slide to limit its adjustment performance, and near the middle section of the guide air plate 60, the flowing air passing through the guide air plate 60 can generate a supporting airflow for the adjustable screen 2 at this position. The above structure provides an operating structure for stably adjusting the air volume, and the adjustable screen 2 is adapted to the screening needs of grains of different particle sizes by operating.

[0043] refer to Figure 2As shown, the air guide assembly 6 includes a guide air plate 60 fixed on the damping plate 41 of the fan housing 4, and the guide air plate 60 is arranged with a plurality of waist-shaped ventilation holes 63 in a matrix form. A rotating seat 601 is provided on the side of the guide air plate 60 close to the damping plate 41, and a feed screw 602 and an adjustment motor 61 are rotatably connected to the rotating seat 601, wherein the adjustment motor 61 is connected to the feed screw 602, and the feed screw 602 is connected to the protruding part of the wind resistance plate 62 by a thread. Both sides of the wind resistance plate are embedded in the sliding groove 603 opened on the guide air plate 60, and the width of the wind resistance plate 62 is three times the width of the part of the guide air plate 60 with the ventilation holes 63. The wind blocking plate 62 is a closed metal plate structure, and the lower end of the wind guide plate is serrated. A vibration plate 64 is welded to the end of each serration. The vibration plate 64 is a rectangular plate and is made of stainless steel. The vibration plate 64 has good structural strength and connection properties. A 13° through-slot 604 is provided at the end of the wind guide plate 60 connected to the vibration plate 64. The through-slot 604 points in the direction of the vibration plate 64. The through-slot 604 can make the amplitude generated by the vibration form a reverse resonance in the through-slot 604, offsetting the influence of part of the vibration on the connection and reducing the contact between the wind guide plate 60 and the vibration plate 64, thereby maintaining the stability of the vibration.

[0044] refer to Figure 1 、 Figure 2 As shown, the supporting base plate 11 has two arc grooves in the horizontal direction. The arc groove close to the fan assembly 5 is a collection groove for collecting grains, and the arc groove away from the fan assembly 5 is a husk groove for collecting rice husks. The frame 1 is rotatably connected to a grain auger 12 in the collection groove, and is rotatably connected to a husk auger 13 in the husk groove. The above-mentioned auger structure is arranged horizontally on the supporting base plate 11 and its transmission end power device, wherein the grain auger 12 is connected to a grain motor 121, and the husk auger 13 is connected to a husk motor 131. The husk motor 131 is connected to the grain motor 121. Arranged on the same side, the frame 1 is rotatably connected to a movable baffle 7 between the two arc-shaped grooves opened on the bearing bottom plate 11. The rotating end of the movable baffle 7 is set on the side of the arc-shaped groove close to the fan assembly 5. The movable baffle 7 is a solid metal plate. Its rotating end passes through the external power device of the frame 1. The adjustment angle of the rotating end of the movable baffle 7 is between 0 and 20 degrees, which is suitable for the separation of grains and rice husks of different qualities. By adjusting the inclination angle and cooperating with the air supply system of the extension assembly, the separation operation of grain husks and rice husks of different qualities can be accurately separated.

[0045] The movable baffle 7 is provided with a flexible baffle 72 at one end away from the rotating end. The other end of the flexible baffle 72 is fixedly connected to the supporting base 11. The flexible baffle 72 is made of rubber material and covers the gap generated by the rotation of the movable baffle 7. The frame 1 is equipped with a through-limiting rod 14 on the side of the flexible baffle 72 away from the movable baffle 7. The flexible baffle 72 has the function of blocking the reverse vortex generated below the movable baffle 7 during the rotation of the movable baffle 7, which could cause rice husks to accumulate on the rotating side of the movable baffle 7. This structure has the technical effect of increasing the screening precision and preventing the backflow of rice husks.

[0046] The working principle of this embodiment is as follows:

[0047] refer to Figure 2 、 Figure 3 、 Figure 5 As shown, the grains fall from the vibrating screen structure above onto the vibrating mesh 3, and then the rice and husks are transported to the regulating mesh 2 through vibration. At this time, the fan assembly 5 works, and the windshield area of ​​the fan is changed by changing the adjustment plate 53, so that the circulation of the blast is kept in a stable range, and there is no structure to change the blowing direction of the fan in the semi-enclosed space formed by the frame 1. The blower causes the flowing air to be blocked by the guide plate 60, and the air flow beam is delivered to the regulating mesh 2 and the movable baffle 7 through the ventilation holes 63 opened thereon. The formation position and size of the air flow beam can be controlled by the adjustment plate 53 on the air guide assembly 6. The whole motor 61 drives the wind resistance plate 62 to complete the process. In order to be suitable for rice husks with a larger wind resistance value, the inclination angle of the mesh screen 2 and the movable baffle 7 is adjusted. The larger the inclination angle, the greater the force on the rice husks falling on the two parts, so that it can receive greater kinetic energy, so that the rice husks can be transported to the position of the rice husk auger 13. Other grains with larger mass and suitable shape will fall into the grain auger 12 due to gravity. The above scheme can meet the needs of recycling and screening rice and rice husks of different particle sizes and qualities, and has the advantages of improving the controllability of the air supply system, supporting controllable air supply volume, air supply scalarization, and structural stability. The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, a number of improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A harvester air supply screening system, comprising a frame (1), a fan housing (4) connected to the frame (1), a bearing base plate (11) fixedly connected to the frame (1), and a vibrating screen (3) and an adjusting screen (2) installed in the frame (1), wherein one end of the vibrating screen (3) is close to the fan housing (4), the adjusting screen (2) is located below the vibrating screen (3), and the vibrating screen (3) covers a part of the adjusting screen (2) in the horizontal direction; the fan housing (4) is provided with an air supply port (44), and the air supply port (44) is directly opposite to the gap between the adjusting screen (2) and the bearing base plate (11); the bearing base plate (11) is wavy and is provided with two arc grooves, and an auger is provided at the arc groove, characterized in that: The invention also includes a fan assembly (5) installed in the fan housing (4) and an air guide assembly (6) installed on the fan housing (4), wherein an adjustment plate (53) is slidably connected in the fan assembly (5), and the adjustment plate (53) changes the wind blocking area of ​​the fan assembly (5) by sliding motion. The air guide assembly (6) includes an air guide plate (60), and the air guide plate (60) is provided with a plurality of ventilation holes (63) and a wind blocking plate (62) covering part of the ventilation holes (63). The air guide assembly (6) is tiltedly arranged at the air supply port (44), and a movable baffle (7) is rotatably connected between two arc grooves provided on the supporting base plate (11). The rotating end of the movable baffle (7) is provided on a side of the arc groove close to the fan assembly (5), and a flexible baffle (72) is provided at one end of the movable baffle (7) away from the rotating end, and the other end of the flexible baffle (72) is fixedly connected to the supporting base plate (11).

2. The harvester air supply screening system according to claim 1, characterized in that: The fan assembly (5) comprises a rotating shaft (51) rotatably connected to the frame (1), an adjusting shaft (54) sleeved on the rotating shaft (51), and a fan plate (52) fixedly connected to the rotating shaft (51); the adjusting shaft (54) is connected to the frame (1) by a thread; the fan plate (52) is provided with a connecting cavity and the adjusting plate (53) is slidably connected in the cavity; the adjusting plate (53) is mounted on the adjusting shaft (54).

3. The harvester air supply screening system according to claim 2, characterized in that: A blast barrel (42) is installed on the other side of the fan housing (4) where the air outlet (44) is opened. The blast barrel (42) is a bent structure, and the bent end opening is arranged vertically.

4. The harvester air supply screening system according to claim 1, characterized in that: The wind guide assembly (6) comprises a wind guide plate (60) fixedly connected to the fan housing (4); an adjustment motor (61) and a threaded rod connected to the adjustment motor (61) are provided on the wind guide plate (60); and the wind blocking plate (62) is slidably connected to the wind guide plate (60) and connected to the threaded rod.

5. The harvester air supply screening system according to claim 4, characterized in that: The end of the wind guide plate (60) is fixedly connected to a vibration plate (64), and a through slot (604) is provided at the connection between the end of the wind guide plate (60) and the vibration plate (64), and the opening angle of the through slot (604) is 13 degrees.

6. The harvester air supply screening system according to claim 5, characterized in that: The regulating mesh screen (2) is rotatably connected to the frame (1) above the supporting base plate (11), and its rotating end is arranged on a side close to the air outlet (44). The rotating end of the regulating mesh screen (2) is connected to a swing motor (22) for driving the rotating end.

7. The harvester air supply screening system according to claim 1, characterized in that: The auger comprises a grain auger (12) arranged on a side close to the air supply port (44) and a husk auger (13) arranged on a side away from the air supply port (44), and both of the auger are connected to a motor for driving the rotation thereof.

8. The harvester air supply screening system according to claim 7, characterized in that: The movable baffle (7) is arranged between the grain auger (12) and the chaff auger (13) and its adjustment angle range is between 0 and 20 degrees.

9. The harvester air supply screening system according to claim 8, characterized in that: The frame (1) is provided with a limiting rod (14) on a side of the flexible baffle (72) away from the movable baffle (7).

10. The harvester air supply screening system according to any one of claims 1 to 7, characterized in that: A bearing plate (21) is arranged obliquely on the adjusting mesh screen (2), and the rotation angle of the adjusting mesh screen (2) is 15°.

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