Corn ear and stalk harvesting double-layer harvesting table and corn harvester

Abstract

The invention relates to the technical field of agricultural machinery, in particular to a corn ear and stalk harvesting double-layer harvesting table and a corn harvester. The corn ear and stalk harvesting double-layer harvesting table comprises a lower-layer harvesting table body and an upper-layer harvesting table body; a first conveying frame and a second conveying frame are fixedly installed in the middle of the back face of the lower-layer harvesting table and the middle of the back face of the upper-layer harvesting table respectively, a first material guiding cover is fixedly installed at the rear end of the first conveying frame, and a second material guiding cover is fixedly installed at the rear end of the second conveying frame. The straw crushing assembly is fixedly mounted at the bottom of the first material guide cover, and the straw crushing assembly is used for crushing corn straws and filtering dust; and the threshing assembly is fixedly installed at the rear end of the second material guiding cover, and compared with an existing double-layer harvesting platform capable of harvesting corncobs and stalks and a corn harvester, the harvesting quality of the corncobs and stalks can be improved through the design of the double-layer harvesting platform capable of harvesting the corncobs and the stalks.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and particularly relates to a double-layer harvesting table for harvesting both corn ears and stalks and a corn harvester. Background Art

[0002] Corn is the largest food crop in China. A corn harvester is an agricultural machinery device specifically used for harvesting corn crops. It cuts mature corn plants through a mechanized method and collects corn kernels. The main components of a corn harvester include a cutting table, a conveying system, a threshing device, and a collecting device; the cutting table is a component on the corn harvester used to cut corn plants; the conveying system is responsible for transporting the cut corn plants from the cutting table to the threshing device; the threshing device is used to separate the kernels of the corn plants from the ear; the collecting device is used to collect the threshed corn kernels and other residues for use as feed.

[0003] Existing ear-and-stalk combined harvesters have problems such as poor chopping effect and easy clogging; in addition, most existing ear harvesters can complete the straw returning operation at one time. The full amount of straw returning results in a large amount of straw coverage, affecting the sowing of the next crop and being prone to breeding pests and diseases. Innovatively researching and developing a new double-layer harvesting table for harvesting both corn ears and stalks and a corn harvester can complete straw harvesting while harvesting ears, provide feed for the livestock industry, and at the same time achieve appropriate straw returning. However, most existing ear-and-stalk combined corn harvesting tables use a straw treatment device based on the principle of a straw returning machine, which is prone to clogging, has a poor straw chopping effect, and the harvested straw is easily contaminated with soil, which is not conducive to long-term storage.

[0004] Therefore, it is particularly important to urgently design a double-layer harvesting table for harvesting both corn ears and stalks and a corn harvester to solve the above defects. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention designs a double-layer harvesting table for harvesting both corn ears and stalks and a corn harvester. The double-layer harvesting table for harvesting both corn ears and stalks and the corn harvester aim to solve the technical problems that most existing ear-and-stalk combined corn harvesting tables use a straw treatment device based on the principle of a straw returning machine, which is prone to clogging, has a poor straw chopping effect, and the harvested straw is easily contaminated with soil, which is not conducive to long-term storage.

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

[0007] A double-layer harvesting table for harvesting both corn ears and stalks includes a lower harvesting table and an upper harvesting table. The upper harvesting table is fixedly installed on the top of the lower harvesting table. A first conveying frame and a second conveying frame are respectively fixedly installed at the middle of the back surfaces of the lower harvesting table and the upper harvesting table. A first guiding cover is fixedly installed at the rear end of the first conveying frame, and a second guiding cover is fixedly installed at the rear end of the second conveying frame;

[0008] The straw crushing assembly is fixedly installed at the bottom of the first material guiding cover, and is used for crushing corn straw and filtering dust.

[0009] The threshing assembly is fixedly installed at the rear end of the second material guiding cover, and is used for corn threshing and separation of impurities and dust.

[0010] As a preferred solution of the present invention, guide augers are rotatably connected to the rear ends inside the lower harvesting table and the upper harvesting table, and the spiral blades on the two guide augers are installed oppositely. Conveyor belts are installed inside the first conveyor frame and the second conveyor frame.

[0011] As a preferred solution of the present invention, the straw crushing assembly includes a first frame installed below the first material guiding cover. A crushing cylinder is fixedly installed at the top of the first frame. A conveying cylinder is fixedly connected to the left end of the crushing cylinder. A discharge pipe is fixedly connected to the right end of the crushing cylinder. The top end of the conveying cylinder is fixedly connected to the first material guiding cover through a first feed hopper. A first rotating shaft is rotatably connected inside the crushing cylinder. A plurality of crushing frames are fixedly connected to the outer side of the first rotating shaft and inside the crushing cylinder. A filtering cylinder is fixedly installed outside the crushing frames inside the crushing cylinder. A waste discharge pipe is fixedly installed at the bottom of the crushing cylinder.

[0012] As a preferred solution of the present invention, a maintenance door is rotatably connected to the outer side of the crushing cylinder, and the outer side of the maintenance door is fixedly connected to the crushing cylinder through a lock.

[0013] As a preferred solution of the present invention, a conveying auger sleeve is fixedly connected to the outer side of the first rotating shaft and outside the conveying cylinder. A machine cover is fixedly installed at the left end of the conveying cylinder. A driven wheel is fixedly connected to the left end of the first rotating shaft and inside the machine cover. A motor is fixedly installed on the outer side of the machine cover. A driving wheel is fixedly connected to the output end of the first motor and inside the machine cover. The driving wheel and the driven wheel are connected by a synchronous belt.

[0014] As a preferred solution of the present invention, the threshing assembly includes a threshing cylinder fixedly installed at the rear end of the second material guiding cover. A second frame is fixedly installed on the outer side of the threshing cylinder. The right end of the threshing cylinder is fixedly connected to the second material guiding cover through a second feed hopper. A second rotating shaft is rotatably connected inside the threshing cylinder. A peeling sleeve is fixedly installed on the outer side of the second rotating shaft and inside the threshing cylinder. A mesh cover is fixedly installed at the bottom end inside the threshing cylinder. A discharge cover is fixedly installed at the bottom of the threshing cylinder. A filtering screen is movably installed inside the second frame and below the discharge cover.

[0015] As a preferred embodiment of the present invention, multiple groups of exhaust hoods are installed at both the front and rear ends of the threshing cylinder, and fans are fixedly connected to the outside of the second rotating shaft and inside the multiple groups of exhaust hoods.

[0016] As a preferred embodiment of the present invention, a filter screen is fixedly installed at the bottom end of the discharge hood, and a waste discharge pipe is fixedly installed on the outside of the discharge hood.

[0017] As a preferred embodiment of the present invention, adjusting screws are rotatably connected to the four corners of the filter screen. The tops of multiple groups of adjusting screws are movably connected to adjusting rods. Both ends of the adjusting rods are rotatably connected to the second frame through bearing seats. The right end of the second rotating shaft is fixedly connected to a first belt pulley. An auxiliary shaft is rotatably connected to the right side of the second frame. The rear end of the auxiliary shaft is fixedly connected to a second belt pulley. The second belt pulley is in transmission connection with the first belt pulley through a transmission belt. A transmission arm is rotatably connected to the back of the second belt pulley, and the left end of the transmission arm is rotatably connected to the filter screen.

[0018] A corn harvester includes the corn ear and stalk double-layer harvesting table described in any one of the above.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In the present invention, through the design of the straw crushing component, the lower harvesting table mainly harvests the thicker straw part of the corn. After the straw part is harvested, it is introduced into the interior of the first conveyor through the guide auger, and then is introduced into the interior of the crushing cylinder through the first guide hood and the first feed hopper, and is introduced into the inner side of the crushing cylinder through the conveying cylinder. The first rotating shaft drives multiple groups of crushing frames to crush the straw. The crushed straw is discharged through the discharge pipe for collection or returning to the field. During the process of crushing the straw, the filter cylinder is used for filtration, so that the dust therein can be separated and leaked out, and is discharged through the waste discharge pipe, thus effectively avoiding the harvested straw containing soil, and further ensuring that the straw can be stored for a long time and improving its harvesting quality.

[0021] 2. In the present invention, through the design of the threshing assembly, the upper harvesting table mainly harvests part of the corn cobs and also contains part of the straw. After harvesting, it is conveyed through the second conveyor frame, and then successively introduced into the interior of the threshing cylinder through the second material guiding cover and the second feed hopper. By driving the second rotating shaft to rotate, the peeling sleeve is driven to rotate. The harvested corn cobs are rubbed against each other between the peeling sleeve and the wire mesh cover to complete threshing. At the same time, the threshed corn cobs and part of the straw are crushed under friction and extrusion and discharged through the wire mesh cover together with the corn kernels. During the threshing process and the subsequent separation of impurities and dust, when the second rotating shaft rotates, it continuously drives the fans inside multiple exhaust hoods to rotate, and continuously discharges the flying impurities and dust through external exhaust to reduce the impurities and dust in the corn kernels and improve the harvesting quality. When the threshed corn cobs and part of the straw enter the discharge hood, they are filtered by the filter screen and discharged through the waste discharge pipe, while the smaller corns and dust fall through. When the second rotating shaft rotates, it also continuously drives the first pulley to rotate, and drives the transmission arm to rotate under the transmission of the transmission belt and the second pulley. Since the four corners of the filter screen are rotatably connected to the second frame through adjusting screws, the transmission arm drives the filter screen to swing, so that the dust in the corn kernels can be further filtered after the corn kernels fall, thereby further improving the harvesting quality of the corn kernels. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a schematic diagram of the external structure of the straw crushing assembly of the present invention;

[0024] Figure 3 is a schematic diagram of the internal structure of the straw crushing assembly of the present invention;

[0025] Figure 4 is a schematic diagram of the front structure of the threshing assembly of the present invention;

[0026] Figure 5 is a schematic diagram of the back structure of the threshing assembly of the present invention;

[0027] Figure 6 is Figure 5 an enlarged schematic diagram of part A in

[0028] Figure 7 is a schematic diagram of the internal structure of the threshing assembly of the present invention.

[0029] In the figure: 1. Lower harvesting table; 101. Feeding auger; 2. Upper harvesting table; 3. First conveying frame; 301. Conveyor belt; 4. Second conveying frame; 5. First feeding cover; 6. Second feeding cover; 7. Straw crushing assembly; 701. First frame; 702. Crushing cylinder; 703. Conveying cylinder; 704. Discharge pipe; 705. First feed hopper; 706. First rotating shaft; 707. Crushing frame; 708. Filter cylinder; 709. Waste discharge pipe; 710. Maintenance door; 711. Lock; 712. Conveying auger sleeve; 713. Machine cover; 714. Driven wheel; 715. Motor; 716. Driving wheel; 717. Timing belt; 8. Threshing assembly; 801. Threshing cylinder; 802. Second frame; 803. Second feed hopper; 804. Second rotating shaft; 805. Stripping sleeve; 806. Mesh cover; 807. Discharge cover; 808. Filter screen; 809. Exhaust hood; 810. Fan; 811. Filter net; 812. Impurity discharge pipe; 813. Adjusting screw; 814. Adjusting rod; 815. Bearing seat; 816. First pulley; 817. Auxiliary shaft; 818. Second pulley; 819. Transmission belt; 820. Transmission arm. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment:

[0032] Please refer to Figures 1-7 , the present invention provides a technical solution:

[0033] A double-layer harvesting table for corn cobs and stalks includes a lower harvesting table 1 and an upper harvesting table 2. The upper harvesting table 2 is fixedly installed on the top of the lower harvesting table 1. A first conveying frame 3 and a second conveying frame 4 are respectively fixedly installed at the middle positions on the back of the lower harvesting table 1 and the upper harvesting table 2. A first feeding cover 5 is fixedly installed at the rear end of the first conveying frame 3, and a second feeding cover 6 is fixedly installed at the rear end of the second conveying frame 4;

[0034] A straw crushing assembly 7 is fixedly installed at the bottom of the first feeding cover 5. The straw crushing assembly 7 is used for crushing corn straws and filtering dust;

[0035] A threshing assembly 8 is fixedly installed at the rear end of the second feeding cover 6. The threshing assembly 8 is used for threshing corn and separating impurities and dust.

[0036] First, a feeding auger 101 is rotatably connected to the rear ends inside the lower harvesting table 1 and the upper harvesting table 2, and the spiral blades on the two feeding augers 101 are installed oppositely. A conveyor belt 301 is installed inside each of the first conveyor frame 3 and the second conveyor frame 4. Through the oppositely installed spiral blades, when the feeding auger 101 is working, the corn ear stalks can be respectively guided into the first conveyor frame 3 and the second conveyor frame 4, and then conveyed through the conveyor belt 301 for separate processing.

[0037] Furthermore, the straw crushing assembly 7 includes a first machine frame 701 installed below the first guiding cover 5. A crushing cylinder 702 is fixedly installed at the top of the first machine frame 701. A conveying cylinder 703 is fixedly connected to the left end of the crushing cylinder 702, and a discharge pipe 704 is fixedly connected to the right end of the crushing cylinder 702. The top of the conveying cylinder 703 is fixedly connected to the first guiding cover 5 through a first feed hopper 705. A first rotating shaft 706 is rotatably connected inside the crushing cylinder 702. A plurality of crushing frames 707 are fixedly connected to the outer side of the first rotating shaft 706 and inside the crushing cylinder 702. A filter cylinder 708 is fixedly installed inside the crushing cylinder 702 and outside the crushing frames 707. A waste discharge pipe 709 is fixedly installed at the bottom of the crushing cylinder 702. The lower harvesting table 1 mainly harvests the thicker straw part of the corn. After the straw part is harvested, it is guided into the first conveyor frame 3 through the feeding auger 101, and then is guided into the inside of the crushing cylinder 702 through the first guiding cover 5 and the first feed hopper 705, and is guided into the inner side of the crushing cylinder 702 through the conveying cylinder 703. The first rotating shaft 706 drives the plurality of crushing frames 707 to crush the straw. The crushed straw is discharged through the discharge pipe 704 for collection or returning to the field. During the process of crushing the straw, the filter cylinder 708 is used for filtering, so that the dust therein can be separated and leaked out, and is discharged through the waste discharge pipe 709, thereby effectively avoiding the harvested straw containing soil, and further ensuring that the straw can be stored for a long time and improving its harvesting quality.

[0038] Then, a maintenance door 710 is rotatably connected to the outer side of the crushing cylinder 702. The outer side of the maintenance door 710 is fixedly connected to the crushing cylinder 702 through a lock 711. The maintenance door 710 can be opened through the lock 711 to regularly maintain the inside of the crushing cylinder 702.

[0039] Furthermore, a conveying auger sleeve 712 is fixedly connected to the outside of the first rotating shaft 706 and located on the outside of the conveying cylinder 703, a hood 713 is fixedly installed on the left end of the conveying cylinder 703, a driven wheel 714 is fixedly connected to the left end of the first rotating shaft 706 and located inside the hood 713, a motor 715 is fixedly installed on the outside of the hood 713, a driving wheel 716 is fixedly connected to the output end of the first motor 715 and located inside the hood 713, the driving wheel 716 and the driven wheel 714 are connected by a synchronous belt 717, the driving wheel 716 is driven by the motor 715 to rotate, and the first rotating shaft 706 is driven by the synchronous belt 717 and the driven wheel 714 to rotate. When the straw is introduced into the interior of the conveying cylinder 703, the straw can be squeezed and transported by the conveying auger sleeve 712, and the straw is compressed and introduced into the interior of the crushing cylinder 702 before being crushed, thereby reducing the space occupied by the straw and avoiding the straw being randomly distributed in the interior of the crushing cylinder 702 and being difficult to discharge.

[0040] Wherein, the threshing assembly 8 includes a threshing cylinder 801 fixedly mounted on the rear end of the second material guide cover 6, a second frame 802 is fixedly mounted on the outer side of the threshing cylinder 801, the right end of the threshing cylinder 801 is fixedly connected to the second material guide cover 6 through a second feed hopper 803, the inside of the threshing cylinder 801 is rotatably connected to a second rotating shaft 804, a stripping sleeve 805 is fixedly mounted on the outer side of the second rotating shaft 804 and located inside the threshing cylinder 801, a mesh cover 806 is fixedly mounted on the bottom end of the inside of the threshing cylinder 801, a discharge cover 807 is fixedly mounted on the bottom of the threshing cylinder 801, and the inside of the second frame 802 and located inside the threshing cylinder 801 are fixedly connected to the second material guide cover 6. A filter screen 808 is movably installed below the discharge cover 807. The upper harvesting platform 2 mainly harvests part of corn cobs and also contains part of straw. After harvesting, it is transported by the second conveyor frame 4, and then successively introduced into the interior of the threshing drum 801 through the second material guide cover 6 and the second feed hopper 803. The stripping sleeve 805 is driven to rotate by driving the second rotating shaft 804. The harvested corn cobs are threshed by mutual friction between the stripping sleeve 805 and the mesh cover 806. At the same time, the threshed corn cobs and part of the straw are broken up under friction and extrusion and discharged together with the corn kernels through the mesh cover 806.

[0041] Furthermore, multiple sets of exhaust hoods 809 are installed at the front and rear ends of the threshing drum 801, and fans 810 are fixedly connected to the outside of the second rotating shaft 804 and inside the multiple sets of exhaust hoods 809. During the threshing process and the subsequent separation of impurities and dust, the second rotating shaft 804 continuously drives the fans 810 inside the multiple sets of exhaust hoods 809 to rotate when it rotates, and continuously removes flying impurities and dust through external exhaust, so as to reduce impurities and dust in corn kernels and improve harvest quality.

[0042] Secondly, a filter screen 811 is fixedly installed at the bottom end of the discharging cover 807, and a waste discharging pipe 812 is fixedly installed on the outer side of the discharging cover 807. When the threshed corn cobs and part of the straw enter the discharging cover 807, they are filtered by the filter screen 811 and discharged through the waste discharging pipe 812, while the smaller corns and dust fall through.

[0043] Furthermore, adjusting screws 813 are rotatably connected to the four corners of the filter screen 808. The tops of multiple groups of adjusting screws 813 are movably connected to adjusting rods 814. Both ends of the adjusting rods 814 are rotatably connected to the second frame 802 through bearing seats 815. The right end of the second rotating shaft 804 is fixedly connected to a first pulley 816. An auxiliary shaft 817 is rotatably connected to the right side of the second frame 802. The rear end of the auxiliary shaft 817 is fixedly connected to a second pulley 818. The second pulley 818 is in transmission connection with the first pulley 816 through a transmission belt 819. A transmission arm 820 is rotatably connected to the back of the second pulley 818, and the left end of the transmission arm 820 is rotatably connected to the filter screen 808. When the second rotating shaft 804 rotates, it will continuously drive the first pulley 816 to rotate. Under the transmission of the transmission belt 819 and the second pulley 818, the transmission arm 820 is driven to rotate. Since the four corners of the filter screen 808 are rotatably connected to the second frame 802 through the adjusting screws 813, the transmission arm 820 will drive the filter screen 808 to swing, so that the dust in the corns can be further filtered after the corns fall, thereby further improving the harvesting quality of the corns.

[0044] The present invention also provides a corn harvester, including a double-layer harvesting table for harvesting both corn cobs and stalks.

[0045] In this embodiment, the implementation scenario is specifically as follows: The lower harvesting table 1 mainly harvests the thicker straw part of the corn. After the straw part is harvested, it is introduced into the interior of the first conveying frame 3 through the feeding auger 101, and then is introduced into the interior of the crushing cylinder 702 through the first guiding cover 5 and the first feeding hopper 705, and is introduced into the inner side of the crushing cylinder 702 through the conveying cylinder 703. The first rotating shaft 706 drives multiple groups of crushing frames 707 to crush the straw. The crushed straw is discharged through the discharge pipe 704 for collection or returning to the field. During the process of crushing the straw, the filter cylinder 708 is used for filtration, so that the dust therein can be separated and leaked out, and is discharged through the waste discharge pipe 709, thereby effectively avoiding the harvested straw containing soil, and further ensuring that the straw can be stored for a long time and improving its harvesting quality. The upper harvesting table 2 mainly harvests the part of the corn ear and also contains part of the straw. After harvesting, it is conveyed through the second conveying frame 4, and then is introduced into the interior of the threshing cylinder 801 through the second guiding cover 6 and the second feeding hopper 803 in sequence. The second rotating shaft 804 is driven to rotate to drive the peeling sleeve 805 to rotate. The harvested corn ears complete threshing by rubbing against each other between the peeling sleeve 805 and the mesh cover 806. At the same time, the threshed corn ears and part of the straw are crushed under friction and extrusion and discharged through the mesh cover 806 together with the corn kernels. During the threshing process and the subsequent separation process of impurities and dust, when the second rotating shaft 804 rotates, it continuously drives the fans 810 inside multiple groups of exhaust hoods 809 to rotate, and continuously discharges the flying impurities and dust through the external exhaust method to reduce the impurities and dust in the corn kernels and improve the harvesting quality. When the threshed corn ears and part of the straw enter the discharge hood 807, they are filtered by the filter screen 811 and discharged through the impurity discharge pipe 812, while the smaller corns and dust are leaked down. When the second rotating shaft 804 rotates, it will also continuously drive the first pulley 816 to rotate. Under the transmission of the transmission belt 819 and the second pulley 818, the transmission arm 820 is driven to rotate. Since the four corners of the filter screen 808 are rotatably connected to the second frame 802 through the adjusting screws 813, the transmission arm 820 will drive the filter screen 808 to swing, so as to further filter the dust in the corn kernels after the corn kernels fall, thereby further improving the harvesting quality of the corn kernels. The whole operation process is simple and convenient. Compared with an existing double-layer harvesting table for corn ears and stalks and a corn harvester, the present invention can improve the harvesting quality of corn ears and stalks through design.

[0046] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer harvesting platform for harvesting corn cobs and stalks, comprising a lower harvesting platform (1) and an upper harvesting platform (2), characterized in that: The upper harvesting platform (2) is fixedly mounted on the top of the lower harvesting platform (1); a first conveying frame (3) and a second conveying frame (4) are respectively fixedly mounted in the middle of the back of the lower harvesting platform (1) and the upper harvesting platform (2); a first material guide cover (5) is fixedly mounted at the rear end of the first conveying frame (3); and a second material guide cover (6) is fixedly mounted at the rear end of the second conveying frame (4); The straw crushing assembly (7) is fixedly mounted on the bottom of the first material guide cover (5), and the straw crushing assembly (7) is used for crushing corn straw and filtering dust; The threshing assembly (8) is fixedly mounted on the rear end of the second material guide cover (6), and is used for threshing corn and separating impurities and dust.

2. A double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 1, characterized in that: The rear ends of the lower harvesting platform (1) and the upper harvesting platform (2) are both rotatably connected to a material guide auger (101), and the spiral blades on the two groups of the material guide auger (101) are installed relative to each other. Conveyor belts (301) are installed inside the first conveying frame (3) and the second conveying frame (4).

3. The double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 1, characterized in that: The straw crushing assembly (7) comprises a first frame (701) installed below the first material guide cover (5); a crushing barrel (702) is fixedly installed on the top of the first frame (701); a conveying barrel (703) is fixedly connected to the left end of the crushing barrel (702); a discharge pipe (704) is fixedly connected to the right end of the crushing barrel (702); the top end of the conveying barrel (703) is fixedly connected to the first material guide cover (5) via a first feed hopper (705); a first rotating shaft (706) is rotatably connected inside the crushing barrel (702); a plurality of crushing frames (707) are fixedly connected to the outside of the first rotating shaft (706) and located inside the crushing barrel (702); a filter barrel (708) is fixedly installed inside the crushing barrel (702) and located outside the crushing frame (707); and a waste discharge pipe (709) is fixedly installed at the bottom of the crushing barrel (702).

4. A double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 3, characterized in that: An inspection door (710) is rotatably connected to the outer side of the crushing cylinder (702), and the outer side of the inspection door (710) is fixedly connected to the crushing cylinder (702) via a lock (711).

5. The double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 3, characterized in that: A conveying auger sleeve (712) is fixedly connected to the outside of the first rotating shaft (706) and located on the outside of the conveying cylinder (703); a hood (713) is fixedly installed on the left end of the conveying cylinder (703); a driven wheel (714) is fixedly connected to the left end of the first rotating shaft (706) and located inside the hood (713); a motor (715) is fixedly installed on the outside of the hood (713); a driving wheel (716) is fixedly connected to the output end of the first motor (715) and located inside the hood (713); the driving wheel (716) and the driven wheel (714) are connected via a synchronous belt (717).

6. The double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 1, characterized in that: The threshing assembly (8) comprises a threshing cylinder (801) fixedly mounted on the rear end of a second material guide cover (6); a second frame (802) is fixedly mounted on the outer side of the threshing cylinder (801); the right end of the threshing cylinder (801) is fixedly connected to the second material guide cover (6) via a second feed hopper (803); a second rotating shaft (804) is rotatably connected to the inside of the threshing cylinder (801); a stripping sleeve (805) is fixedly mounted on the outer side of the second rotating shaft (804) and located inside the threshing cylinder (801); a mesh cover (806) is fixedly mounted on the bottom end of the threshing cylinder (801); a discharge cover (807) is fixedly mounted on the bottom of the threshing cylinder (801); and a filter screen (808) is movably mounted inside the second frame (802) and located below the discharge cover (807).

7. The double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 6, characterized in that: A plurality of exhaust hoods (809) are installed at both the front and rear ends of the threshing drum (801), and fans (810) are fixedly connected to the outside of the second rotating shaft (804) and inside the plurality of exhaust hoods (809).

8. The double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 6, characterized in that: A filter screen (811) is fixedly mounted on the bottom end of the discharge cover (807), and a debris discharge pipe (812) is fixedly mounted on the outer side of the discharge cover (807).

9. The double-layer harvesting platform for harvesting both corn cobs and stalks according to claim 6, characterized in that: The four corners of the filter screen (808) are rotatably connected with adjusting screws (813), and the top ends of the multiple groups of adjusting screws (813) are movably connected with adjusting rods (814). Both ends of the adjusting rods (814) are rotatably connected to the second frame (802) through bearing seats (815). The right end of the second rotating shaft (804) is fixedly connected with a first pulley (816). The right side of the second frame (802) is rotatably connected with an auxiliary shaft (817). The rear end of the auxiliary shaft (817) is fixedly connected with a second pulley (818). The second pulley (818) is transmission-connected to the first pulley (816) through a transmission belt (819). The back side of the second pulley (818) is rotatably connected with a transmission arm (820), and the left end of the transmission arm (820) is rotatably connected to the filter screen (808).

10. A corn harvester, characterized in that: It comprises the double-layer harvesting platform for harvesting both corn cobs and stalks as claimed in any one of claims 1 to 9.

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