A corn low-loss threshing device with multi-degree-of-freedom adjustable nozzle

Abstract

This invention relates to a low-loss corn threshing device with multi-degree-of-freedom adjustable nozzles, comprising a gantry frame, a corn ear conveying mechanism installed below the gantry frame, a gap floating adjustment mechanism, a gas nozzle posture adjustment mechanism, a stroke position adjustment mechanism, and a kernel collection box. The gas nozzle posture adjustment mechanism is equipped with multi-degree-of-freedom adjustable nozzles. The corn ear conveying mechanism drives the corn ears forward via chain transmission. The gap floating adjustment mechanism adjusts the clamping tightness of the corn ears. The stroke position adjustment mechanism and the gas nozzle posture adjustment mechanism blow high-speed airflow onto the corn ears, causing the corn to rotate and thresh on the corn ear conveying mechanism. The kernels are then collected in the kernel collection box. This invention is ingeniously designed, enabling threshing of the corn surface without dead angles, efficiently threshing while avoiding kernel damage, ensuring threshing effect, and improving production efficiency. Compared with existing technologies, it has excellent market prospects and development space.

Description

Technical Field

[0001] This invention relates to the field of corn threshing technology, and in particular to a low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle. Background Technology

[0002] Corn is one of the world's three major food crops. It can be eaten directly as food and also used in industrial production, such as for alcohol and fertilizer. This has led to a growing demand for corn in my country. The development of corn is primarily focused on both food and industrial uses. For food, attention must be paid to corn cultivation. Developing efficient, high-quality, and high-yield corn planting strategies is essential. Furthermore, corn's industrial applications are indispensable, such as in pharmaceuticals, starch production, and oil extraction. Therefore, developing the role of corn in the industrial sector is crucial for the diversified economic development of corn.

[0003] People are constantly developing new corn threshing devices; currently, the main types include impact threshing, rolling threshing, and kneading threshing devices. These mechanical corn threshing devices are characterized by high production efficiency, simple operation, reliable operation, and convenient use and maintenance. Domestic research on pneumatic threshing mainly focuses on millet threshing, but research on corn threshing under pneumatic force is relatively limited, especially for high-moisture corn with a moisture content of 25% to 35%. Existing corn threshing devices struggle to avoid kernel damage while ensuring efficient threshing.

[0004] The current problem to be solved is how to design a corn threshing device with a multi-degree-of-freedom adjustable nozzle that is ingeniously designed, simple in structure, can thresh corn without dead angles, efficiently thresh corn without damaging the kernels, ensure threshing effect, and improve production efficiency. Summary of the Invention

[0005] To address the technical problems of existing corn threshing devices, such as difficulty in avoiding kernel damage while ensuring efficient threshing, low production efficiency, and unsuitability for threshing corn with high moisture content, this invention provides a low-damage corn threshing device with multi-degree-of-freedom adjustable nozzles. This device achieves the goals of ingenious design, simple structure, threshing of corn without dead angles, efficient threshing while avoiding kernel damage, ensuring threshing effect, and improving production efficiency.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a low-loss corn threshing device with multi-degree-of-freedom adjustable nozzles, including a gantry frame, a corn ear conveying mechanism installed below the gantry frame, a gap floating adjustment mechanism, a gas nozzle position adjustment mechanism, a stroke position adjustment mechanism, and a kernel collection box. The gas nozzle position adjustment mechanism is equipped with multi-degree-of-freedom adjustable nozzles. The corn ear conveying mechanism drives the corn ears forward through chain transmission. The gap floating adjustment mechanism adjusts the clamping tightness of the corn ears. Then, the stroke position adjustment mechanism and the gas nozzle position adjustment mechanism blow high-speed airflow onto the corn ears, causing the corn to rotate and thresh on the corn ear conveying mechanism, and collect the kernels through the kernel collection box.

[0007] As a further optimization of the aforementioned low-loss corn threshing device with multi-degree-of-freedom adjustable nozzles, the corn ear conveying mechanism includes a frame, a first motor, a conveying sprocket, a drive wheel, a second motor, a driven wheel, and a threshing sprocket. The frame is installed below the gantry frame, with its bottom flush with the bottom of the gantry frame. A fixed frame is installed at each of the left and right ends of the frame, and the fixed frames are welded to the inner side of the gantry frame. The sprocket seats of the two conveying sprockets are installed on the fixed frames. The body of the first motor is fixed at the lower end of the right fixed frame, and the motor drives the conveying sprocket. The two sprockets are connected by two parallel chains for power transmission. The two chains pass through the center of the frame, and two guide rails are installed horizontally on the frame. Corn ears are placed on the chains and conveyed forward on the guide rails through chain transmission. The number of drive wheels and driven wheels is three each. The driving and driven wheels are installed parallel to each other and opposite each other on both sides of the middle of the frame. The axes of the driving and driven wheels are perpendicular to the direction of the guide rail. The upper and lower ends of the driving wheel are respectively used to achieve circumferential rotation and axial fixation through bearings and bearing sleeves. The bearing sleeves are fixed to the frame by bolts and nuts. The upper and lower ends of the driven wheel are respectively fixed by bearings and bearing sleeves. The upper and lower bearing sleeves are fixed to the frame by a gap floating adjustment mechanism. A threshing sprocket is fitted on the lower end of one side of each driving wheel. The three sets of threshing sprockets are connected in sequence by a chain. The second motor is installed at the bottom of the frame. The second motor rotates and transmits power to the threshing sprockets. The threshing sprockets then transmit power to the three driving wheels in sequence by the chain, thereby driving the driving wheels to rotate. A gap is left between the driving and driven wheels for the corn ears to pass through. The driving and driven wheels clamp the corn ears and continue to transport them forward along the conveying direction of the conveying sprockets.

[0008] As a further optimization of the corn low-loss threshing device with multi-degree-of-freedom adjustable nozzles mentioned above, the distance between two adjacent drive wheels is 400mm-450mm.

[0009] As a further optimization of the corn low-loss threshing device with multi-degree-of-freedom adjustable nozzles mentioned above, both the active and passive wheels are made of polyester resin to avoid damage to the kernels on the corn ears during transportation.

[0010] As a further optimization of the aforementioned low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle, the gap floating adjustment mechanism is installed on the driven wheel. Each driven wheel has a gap floating adjustment mechanism installed at both its upper and lower ends. The gap floating adjustment mechanism includes a support shaft, bearing sleeves, a gap support shaft, linear bearings, a floating mounting plate, a spring, and a gap adjustment retaining ring. The fixed end of the gap support shaft is bolted to the frame, and the bearing sleeves at both ends of the driven wheel are bolted to the floating mounting plate. The floating mounting plate has pre-drilled holes through which the extended ends of two gap support shafts on the same side pass, and are then fixedly connected by linear bearings on the left and right sides of the floating mounting plate. A gap adjustment retaining ring is installed in the middle of the gap support shaft, and a spring is installed between the gap adjustment retaining ring and the frame, allowing the floating mounting plate and the driven wheel to elastically slide at the extended end of the gap support shaft, adjusting the gap between the driving wheel and the driven wheel.

[0011] As a further optimization of the aforementioned low-loss corn threshing device with multi-degree-of-freedom adjustable nozzles, the stroke position adjustment mechanism is fixed on the gantry frame, directly above the corn ear conveying mechanism. The stroke position adjustment mechanism includes a servo motor, a connecting frame, a mounting frame, and a support frame. The left and right gas nozzle posture adjustment mechanisms are both fixedly welded to the connecting frame via a mounting frame. The mounting frame is a rectangular frame structure. The two connecting frames are fixed to a horizontally set horizontal bar by welding. A vertical support frame is set in the middle of the horizontal bar. The bottom of the support frame is welded to the horizontal bar. The top of the support frame passes through a pre-set guide rail groove in the middle of the gantry frame. A gear belt is set on the support frame. The gear belt meshes with the gear shaft of the servo motor set on the gantry frame. Through the interaction of the guide rail groove, the gear belt on the support frame, and the servo motor, the spatial position adjustment of the gas nozzle posture adjustment mechanism can be realized.

[0012] As a further optimization of the aforementioned low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle, the gas nozzle posture adjustment mechanism includes a stepper motor, a motor bracket, a synchronous belt, a main gear, a nozzle mounting bracket drive shaft, a nozzle, a connector, an air pipe, a nozzle mounting bracket, and a nozzle mounting bracket driven shaft. A motor bracket is provided at the bottom of the mounting bracket of the gas nozzle posture adjustment mechanism. A stepper motor is mounted on the motor bracket, and the motor shaft end of the stepper motor is fitted with a main gear. The nozzle mounting bracket drive shaft axially passes through and is fixed on the left and right sides of the mounting bracket, with three shafts on each side, evenly spaced along the mounting bracket. The end of the nozzle mounting bracket drive shaft is fitted with a component that cooperates with the main gear. The auxiliary gear is connected to the main gear and the auxiliary gear into a whole by a synchronous belt; the nozzle fixing frame is provided on the drive shaft of the nozzle fixing frame, and the two ends of the nozzle fixing frame are fixed to the drive shaft of the nozzle fixing frame by bolts; the middle part of the nozzle fixing frame adopts an arc-shaped hollow structure, and three air pipe mounting holes for installing air pipes are evenly arranged on the nozzle fixing frame. The nozzle is fixedly connected to the air pipe through a connector; when the stepper motor is started, it drives the drive shaft of the nozzle fixing frame to rotate through the synchronous belt and the main gear, thereby driving the nozzle fixing frame to rotate, so as to adjust the nozzle to be aligned with the corn ear from different angles. The high-pressure airflow sprayed from the nozzle blows to different sides of the corn ear, so that the corn kernels are separated from the corn ear.

[0013] As a further optimization of the corn low-loss threshing device with multi-degree-of-freedom adjustable nozzles mentioned above, the inner diameter of the air pipe is 12mm and the outer diameter is 16mm.

[0014] As a further optimization of the corn low-loss threshing device with a multi-degree-of-freedom adjustable nozzle, the high-pressure gas ejected by the nozzle has a pressure range of 1.3MPa to 1.6MPa.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention uses a corn ear conveying mechanism to move the corn, allowing the ears to rotate freely with adjacent axles during movement. Air is then blown onto the corn by a gas nozzle position adjustment mechanism. The kernels blown onto the corn surface by the airflow separate from the ears under the force of the airflow, completing the threshing process. As the corn sequentially passes through the gas nozzle position adjustment mechanism, it rotates, ensuring thorough threshing without any blind spots. The entire threshing process utilizes airflow generated by a multi-degree-of-freedom adjustable airflow generator, eliminating any contact between mechanical parts and the corn surface. This ensures efficient threshing while preventing kernel damage, making it particularly suitable for high-moisture corn with a moisture content of 25%–35%. To guarantee threshing effectiveness, this invention ensures that the airflow is directed towards the corn at high speed and in multiple directions, simultaneously improving both kernel removal and corn rotation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0018] Figure 2 A top view of the corn cob conveyor system (chains are hidden).

[0019] Figure 3 This is a schematic diagram of the main structure of a corn ear conveying device (with the chain hidden).

[0020] Figure 4 This is a three-dimensional structural diagram of the gap floating adjustment mechanism;

[0021] Figure 5 This is a three-dimensional structural diagram of the stroke position adjustment mechanism;

[0022] Figure 6 A three-dimensional structural diagram of the gas nozzle posture adjustment mechanism;

[0023] Markings in the diagram: 1. Gantry frame, 2. Frame, 3. Stroke position adjustment mechanism, 4. Corn ear conveying mechanism, 5. Grain collection box, 6. First motor, 7. Conveyor sprocket, 8. Gap floating adjustment mechanism, 9. Drive wheel axle, 10. Second motor, 11. Driven wheel axle, 12. Threshing sprocket, 13. Support shaft, 14. Bearing sleeve, 15. Gap support shaft, 16. Linear bearing, 17. Floating mounting plate, 18. Spring. 9. Gap adjustment retaining ring; 20. Servo motor; 21. Gas nozzle posture adjustment mechanism; 22. Connecting frame; 23. Stepper motor; 24. Motor bracket; 25. Synchronous belt; 26. Main gear; 27. Nozzle holder drive shaft; 28. Nozzle; 29. ​​Connector; 30. Air pipe; 31. Nozzle holder; 32. Nozzle holder driven shaft; 33. Mounting bracket; 34. Support frame; 35. Secondary gear; 36. Air pipe mounting hole. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, Figure 1This is a schematic diagram of the main structure of the present invention; a low-loss corn threshing device with multi-degree-of-freedom adjustable nozzles includes a gantry frame 1, a corn ear conveying mechanism 4 installed below the gantry frame 1, a gap floating adjustment mechanism 8, a gas nozzle position adjustment mechanism 21, a stroke position adjustment mechanism 3, and a kernel collection box 5. The gas nozzle position adjustment mechanism 21 is equipped with multi-degree-of-freedom adjustable nozzles. The corn ear conveying mechanism 4 drives the corn ears forward through chain transmission. The gap floating adjustment mechanism 8 adjusts the clamping tightness of the corn ears. Then, the stroke position adjustment mechanism 3 and the gas nozzle position adjustment mechanism 21 blow high-speed airflow onto the corn ears, causing the corn to rotate and thresh on the corn ear conveying mechanism 4, and collect the kernels through the kernel collection box 5.

[0026] like Figure 2 and 3 As shown, Figure 2 A top view of the corn cob conveyor system (chains are hidden). Figure 3This is a schematic diagram of the main structure of the corn ear conveying device of the present invention (with the chain hidden). The corn ear conveying mechanism 4 includes a frame 2, a first motor 6, a conveying sprocket 7, a drive wheel 9, a second motor 10, a driven wheel 11, and a threshing sprocket 12. The frame 2 is installed below the gantry frame 1, and the bottom of the frame 2 is flush with the bottom of the gantry frame 1. A fixed frame is provided at each of the left and right ends of the frame 2. The left and right ends of the fixed frame are fixedly connected to the inner side of the gantry frame 1 by welding. The sprocket seats of the two left and right conveying sprockets 7 are installed on the fixed frames. The body of the first motor 6 is fixed at the lower end of the right fixed frame. The motor 6 drives the conveying sprocket 7 to move. The two sprockets are connected to each other by two parallel chains to transmit power. The two chains pass through the center of the frame 2. Two guide rails are arranged horizontally on the frame 2. The corn ears are placed on the chains and conveyed forward on the guide rails by the transmission of the chains. There are three drive wheels 9 and three driven wheels 11. 1. The drive wheel 9 and the driven wheel 11 are installed parallel to each other on both sides of the middle of the frame 2. The axes of the drive wheel 9 and the driven wheel 11 are perpendicular to the direction of the guide rail. The upper and lower ends of the drive wheel 9 are respectively fixed to the frame 2 by bearings and bearing sleeves. The bearing sleeves are fixed to the frame 2 by bolts and nuts. The upper and lower ends of the driven wheel 11 are respectively fixed by bearings and bearing sleeves. The upper and lower bearing sleeves are fixed to the frame 2 by the gap floating adjustment mechanism 8. The lower end of one side of each drive wheel 9 is fitted with a threshing sprocket 12. The three sets of threshing sprockets 12 are connected in sequence by a chain. The second motor 10 is installed at the bottom of the frame. The second motor 10 rotates and transmits power to the threshing sprockets 12. The threshing sprockets 12 then transmit power to the three drive wheels 9 in sequence by the chain, thereby driving the drive wheels 9 to rotate. There is a gap between the drive wheel 9 and the driven wheel 11 for the corn ears to pass through. The drive wheel 9 and the driven wheel 11 sandwich the corn ears and continue to transport them forward along the conveying direction of the conveying sprocket 7. The distance between two adjacent drive wheels 9 is 400mm-450mm. Both the drive wheel 9 and the driven wheel 11 are made of polyester resin to prevent damage to the kernels on the corn ears during transportation.

[0027] like Figure 4 As shown, Figure 4This is a three-dimensional structural diagram of the gap floating adjustment mechanism. The gap floating adjustment mechanism 8 is mounted on the driven wheel 11. Each driven wheel 11 has a gap floating adjustment mechanism 8 installed at both its upper and lower ends. The gap floating adjustment mechanism 8 includes a support shaft 13, a bearing sleeve 14, a gap support shaft 15, a linear bearing 16, a floating mounting plate 17, a spring 18, and a gap adjustment retaining ring 19. The fixed end of the gap support shaft 15 is fixed to the frame 2 by bolts. The bearing sleeves 14 at both ends of the driven wheel 11 are fixed to the floating mounting plate 17 by bolts. The floating mounting plate 17 has a reserved hole. The protruding ends of the two gap support shafts 15 on the same side pass through the reserved hole and are then fixedly connected by the linear bearings 16 set on the left and right sides of the floating mounting plate 17. A gap adjustment retaining ring 19 is set in the middle of the gap support shaft 15. A spring 18 is set between the gap adjustment retaining ring 19 and the frame 2 so that the floating mounting plate 17 and the driven wheel 11 can elastically slide at the protruding end of the gap support shaft 15 to adjust the gap between the driving wheel 9 and the driven wheel 11.

[0028] like Figure 5 As shown, Figure 5 This is a three-dimensional structural diagram of the stroke position adjustment mechanism. The stroke position adjustment mechanism 3 is fixed on the gantry frame 1, directly above the corn ear conveying mechanism 4. The stroke position adjustment mechanism 3 includes a servo motor 20, a connecting frame 22, a mounting frame 33, and a support frame 34. The left and right gas nozzle posture adjustment mechanisms 21 are both fixedly welded to the connecting frame 22 through a mounting frame 33. The mounting frame 33 is a rectangular frame structure. The two connecting frames 22 are fixed to a horizontally set horizontal bar by welding. A vertical support frame 34 is set in the middle of the horizontal bar. The bottom of the support frame 34 is welded to the horizontal bar. The top of the support frame 34 passes through a pre-set guide rail groove in the middle of the gantry frame 1. A gear belt is set on the support frame 34. The gear belt meshes with the gear shaft of the servo motor 20 set on the gantry frame 1. Through the interaction of the guide rail groove, the gear belt on the support frame 34, and the servo motor 20, the spatial position adjustment of the gas nozzle posture adjustment mechanism 21 in the up, down, left, and right directions is realized.

[0029] like Figure 6 As shown, Figure 6This is a three-dimensional structural diagram of the gas nozzle posture adjustment mechanism 21. The gas nozzle posture adjustment mechanism 21 includes a stepper motor 23, a motor bracket 24, a synchronous belt 25, a main gear 26, a nozzle mounting bracket drive shaft 27, a nozzle 28, a connector 29, an air pipe 30, a nozzle mounting bracket 31, and a nozzle mounting bracket driven shaft 32. The bottom of the mounting bracket 33 of the gas nozzle posture adjustment mechanism 21 is provided with a motor bracket 24, on which the stepper motor 23 is mounted. The motor shaft end of the stepper motor 23 is fitted with the main gear 26. The nozzle mounting bracket drive shaft 27 axially passes through and is fixed to the left and right sides of the mounting bracket 33, with three shafts on each side, all along the [path of the mechanism]. The mounting brackets 33 are evenly spaced; the end of the nozzle fixing bracket drive shaft 27 is equipped with a secondary gear 35 that works with the main gear 26, and the main gear 26 and the secondary gear 35 are connected as a whole by a synchronous belt 25; a nozzle fixing bracket 31 is provided on the nozzle fixing bracket drive shaft 27, and the two ends of the nozzle fixing bracket 31 are fixed to the nozzle fixing bracket drive shaft 27 by bolts; the middle part of the nozzle fixing bracket 31 adopts an arc-shaped hollow structure, and three air pipe mounting holes 36 for installing air pipes 30 are evenly arranged on the nozzle fixing bracket 31. The radius of the air pipe mounting hole 36 is 9mm, the inner diameter of the air pipe 30 is 12mm, and the outer diameter is 16mm. The nozzle 28 is fixedly connected to the air pipe 30 via the connector 29; the stepper motor 23 starts and drives the nozzle mounting bracket drive shaft 27 to rotate via the synchronous belt 25 and the main gear 26, which in turn drives the nozzle mounting bracket 31 to rotate. The rotation angle is 45 degrees to the left and right, so that the nozzle 28 can be adjusted to be aligned with the corn ear from different angles. The high-pressure airflow sprayed from the nozzle 28 blows to different sides of the corn ear so that the corn kernels are separated from the corn ear.

[0030] By adjusting the position of the stroke position adjustment mechanism 21 on the gantry frame 1 (up, down, left, and right), a variable airflow can be formed. This improves both the threshing effect of blowing the kernels off the ears and the rotation effect of the corn, ensuring efficient threshing while preventing kernel damage.

[0031] The working process of this invention is as follows: First, multiple corn cobs are placed on the chain of the corn cob conveying mechanism 4. Between the parallel driving wheel shaft 9 and driven wheel shaft 11, the first motor 6 drives the moving sprocket 7, and the second motor 10 drives the threshing sprocket 12 to move. When the corn cob is directly below the gas nozzle posture adjustment mechanism 21, the nozzle 28 is turned on to blow high-pressure airflow towards the corn below, so that different sides of the corn cob can rotate towards the air nozzle and thresh the kernels until all kernels are separated from the corn cob. A kernel collection box 5 is placed at the lower end of the corn cob conveying mechanism 4 to collect the kernels. The posture of the corn can be adjusted by the gas nozzle posture adjustment mechanism 21 and the stroke position adjustment mechanism 3 according to the different shapes of the corn.

[0032] In practical applications, experiments have shown that the optimal distance between two adjacent drive wheels 9 is 400mm-450mm. The optimal pressure range for the high-pressure gas ejected from the nozzle 28 is 1.3MPa-1.6MPa.

[0033] This invention is ingeniously designed and has a simple structure. It can thresh corn without dead angles, avoid kernel damage while threshing efficiently, ensure threshing effect, improve production efficiency, and solve the technical problems of existing corn threshing devices that are difficult to avoid kernel damage while ensuring efficient threshing, have low production efficiency, and are not suitable for threshing corn with high moisture content. Compared with existing technologies, it has a good market prospect and development space.

[0034] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the concept of the present invention.

Claims

1. A low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle, characterized in that: The system includes a gantry frame (1), a corn ear conveying mechanism (4) installed below the gantry frame (1), a gap floating adjustment mechanism (8), a gas nozzle position adjustment mechanism (21), a stroke position adjustment mechanism (3), and a grain collection box (5). The gas nozzle position adjustment mechanism (21) is equipped with a multi-degree-of-freedom adjustable nozzle. The corn ear conveying mechanism (4) drives the corn ear forward through the chain transmission. The gap floating adjustment mechanism (8) adjusts the tightness of the corn ear clamping. The stroke position adjustment mechanism (3) and the gas nozzle position adjustment mechanism (21) blow high-speed airflow to the corn ear, causing the corn to rotate and thresh on the corn ear conveying mechanism (4). The kernels are then collected by the grain collection box (5). The stroke position adjustment mechanism (3) is fixed on the gantry frame (1) and directly above the corn ear conveying mechanism (4). The stroke position adjustment mechanism (3) includes a servo motor (20), a connecting frame (22), a mounting frame (33), and a support frame (34). The left and right gas nozzle posture adjustment mechanisms (21) are both fixedly welded to the connecting frame (22) through a mounting frame (33). The mounting frame (33) is a rectangular frame structure. The two connecting frames (22) are fixed to a horizontally set horizontal bar by welding. A vertical support frame (34) is provided in the middle of the horizontal bar. The bottom of the support frame (34) is welded to the horizontal bar. The top of the support frame (34) passes through the guide rail groove in the middle of the gantry frame (1). A gear belt is provided on the support frame (34). The gear belt meshes with the gear shaft of the servo motor (20) provided on the gantry frame (1). Through the interaction of the guide rail groove, the gear belt on the support frame (34) and the servo motor (20), the spatial position adjustment of the gas nozzle posture adjustment mechanism (21) can be realized in the up, down, left and right directions. The gas nozzle posture adjustment mechanism (21) includes a stepper motor (23), a motor bracket (24), a synchronous belt (25), a main gear (26), a nozzle mounting bracket drive shaft (27), a nozzle (28), a connector (29), an air pipe (30), a nozzle mounting bracket (31), and a nozzle mounting bracket driven shaft (32). A motor bracket (24) is provided at the bottom of the mounting bracket (33) of the gas nozzle posture adjustment mechanism (21). A stepper motor (23) is mounted on the motor bracket (24), and the motor shaft end of the stepper motor (23) is fitted with a main gear (26). The nozzle mounting bracket drive shaft (27) axially passes through and is fixed on both sides of the mounting bracket (33), with three shafts on each side, evenly spaced along the mounting bracket (33). A secondary gear (35) is installed at the end of the nozzle mounting bracket drive shaft (27) to cooperate with the main gear (26). The drive shaft is connected via a synchronous belt. 25) Connect the main gear (26) and the auxiliary gear (35) into a whole; the nozzle fixing frame (31) is provided on the nozzle fixing frame drive shaft (27), and the two ends of the nozzle fixing frame (31) are fixed to the nozzle fixing frame drive shaft (27) by bolts; the middle part of the nozzle fixing frame (31) adopts an arc-shaped hollow structure, and three air pipe mounting holes (36) for installing air pipes (30) are evenly arranged on the nozzle fixing frame (31). The nozzle (28) is fixedly connected to the air pipe (30) through the connector (29); the stepper motor (23) is started, and the nozzle fixing frame drive shaft (27) is driven to rotate through the synchronous belt (25) and the main gear (26), which in turn drives the nozzle fixing frame (31) to rotate, so that the nozzle (28) is adjusted to be aligned with the corn ear from different angles, and the high-pressure airflow sprayed from the nozzle (28) is blown to different sides of the corn ear so that the corn kernels are separated from the corn ear.

2. The low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle as described in claim 1, characterized in that: The corn ear conveying mechanism (4) includes a frame (2), a first motor (6), a conveying sprocket (7), a drive wheel (9), a second motor (10), a driven wheel (11), and a threshing sprocket (12). The frame (2) is installed below the gantry frame (1), and the bottom of the frame (2) is flush with the bottom of the gantry frame (1). A fixed frame is provided at each of the left and right ends of the frame (2). The left and right ends of the fixed frame are fixedly connected to the inner side of the gantry frame (1) by welding. The sprocket seats of the two conveying sprockets (7) are installed on the fixed frame. The body of the first motor (6) is fixed at the lower end of the right fixed frame. The first motor (6) drives the conveying sprocket (7) to move. The two sprockets on the left and right are connected by two parallel chains to transmit power. The two chains pass through the center of the frame (2). Two guide rails are set on the frame (2) in the horizontal direction. The corn ears are placed on the chains and conveyed forward on the guide rails through the transmission of the chains. There are three driving wheels (9) and three driven wheels (11). The driving wheels (9) and the driven wheels (11) are parallel to each other and installed opposite each other. On both sides of the middle of the frame (2), the axial direction of the drive wheel (9) and the driven wheel (11) is perpendicular to the direction of the guide rail. The upper and lower ends of the drive wheel (9) are respectively fixed to the frame (2) by bearings and bearing sleeves. The bearing sleeves are fixed to the frame (2) by bolts and nuts. The upper and lower ends of the driven wheel (11) are respectively fixed by bearings and bearing sleeves. The upper and lower bearing sleeves are fixed to the frame (2) by the gap floating adjustment mechanism (8). The lower end of one side of each drive wheel (9) is fitted with a threshing sprocket (12). The three sets of threshing sprockets (12) are connected in sequence. The second motor (10) is installed at the bottom of the frame. The second motor (10) rotates and transmits power to the threshing sprockets (12). The threshing sprockets (12) then transmit power to the three drive wheels (9) in sequence by means of the chain, thereby driving the drive wheels (9) to rotate. There is a gap between the drive wheels (9) and the passive wheels (11) for the corn ears to pass through. The drive wheels (9) and the passive wheels (11) wrap the corn ears and carry them forward along the conveying direction of the conveying sprockets (7).

3. The corn threshing device with a multi-degree-of-freedom adjustable nozzle as described in claim 2, characterized in that: The distance between two adjacent drive wheels (9) is 400mm-450mm.

4. The corn threshing device with a multi-degree-of-freedom adjustable nozzle as described in claim 2, characterized in that: Both the drive wheel (9) and the driven wheel (11) are made of polyester resin to prevent damage to the kernels on the corn cob during transportation.

5. A low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle as described in claim 2, characterized in that: The gap floating adjustment mechanism (8) is installed on the driven wheel (11). Each driven wheel (11) has a gap floating adjustment mechanism (8) installed at both the upper and lower ends. The gap floating adjustment mechanism (8) includes a support shaft (13), a bearing sleeve (14), a gap support shaft (15), a linear bearing (16), a floating mounting plate (17), a spring (18), and a gap adjustment retaining ring (19). The fixed end of the gap support shaft (15) is fixed to the frame (2) by bolts. The bearing sleeves (14) at both the upper and lower ends of the driven wheel (11) are fixed to the floating mounting plate (2) by bolts. On 17), a reserved hole is provided on the floating mounting plate (17). The extended ends of two gap support shafts (15) on the same side pass through the reserved hole and are then fixedly connected by linear bearings (16) set on the left and right sides of the floating mounting plate (17). A gap adjustment retaining ring (19) is provided in the middle of the gap support shaft (15). A spring (18) is provided between the gap adjustment retaining ring (19) and the frame (2) so that the floating mounting plate (17) and the passive wheel (11) can slide elastically at the extended end of the gap support shaft (15) to adjust the gap between the driving wheel (9) and the passive wheel (11).

6. The low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle as described in claim 1, characterized in that: The trachea (30) has an inner diameter of 12 mm and an outer diameter of 16 mm.

7. A low-loss corn threshing device with a multi-degree-of-freedom adjustable nozzle as described in claim 1, characterized in that: The high-pressure gas ejected by the nozzle (28) has a pressure range of 1.3MPa to 1.6MPa.

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