Low-damage corn threshing device suitable for high water content

Abstract

The low-damage corn threshing device comprises a roller main body and an upper cover plate arranged on the upper side of the roller main body, a main shaft connected with external driving equipment is arranged in the roller main body, the main shaft and the roller main body are coaxially arranged, and a spiral feeding opening is formed in an inlet of the roller main body; and a spiral blade is arranged at the spiral feeding port. Corn is threshed through the rigid-flexible combined threshing element and the thumb-preventing threshing element, the collision striking force on corn ears can be reduced, the kernel breakage rate is reduced, the corn threshing income is improved, meanwhile, the concave grid is innovatively designed, a conventional grid type concave grid is changed, and the threshing efficiency is improved. The round tube sleeve type combined concave grid with the square holes is innovatively designed, a nylon sleeve is installed on a round tube of the round tube sleeve type combined concave grid, a cylindrical steel tube is welded to the square holes of the square hole of the round tube sleeve type combined concave grid, the number of times of contact with corn ears is further increased, collision to grains is reduced, and the threshing rate of the corn grains is improved.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, in particular to a low-damage corn threshing device suitable for high-moisture content corn. Background Art

[0002] The corn threshing device is used to separate corn kernels from corn ears. The traditional manual threshing method is time-consuming, labor-intensive, and inefficient, while the use of a special threshing device can greatly improve productivity. Most of the existing corn threshing devices use corn threshing elements (such as nail teeth and plate teeth) with a small contact area with the corn kernels, and the threshing elements have sharp edges that have a strong impact on the corn, which directly causes a high rate of corn kernel breakage during the threshing process, reducing the benefits. At the same time, there is also a high rate of unthreshed corn kernels, which cannot meet the requirements of the rapid development of mechanization at this stage. To this end, we propose a low-damage corn threshing device suitable for high moisture content. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a low-damage corn threshing device suitable for high moisture content, which can reduce the impact force on corn ears, reduce the grain breakage rate, and improve the corn threshing profit. At the same time, the concave plate screen is innovatively designed, which not only further increases the number of contacts with corn ears but also reduces the collision with grains, improves the corn grain threshing rate, and further improves the corn threshing profit, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-damage corn threshing device suitable for high-moisture content corn, comprising a drum main body and an upper cover plate arranged on the upper side of the drum main body, a main shaft connected to an external driving device is arranged in the drum main body, the main shaft and the drum main body are arranged coaxially, a spiral feeding inlet is arranged at the inlet of the drum main body, a spiral blade is arranged at the spiral feeding inlet, a guide hood is fixedly arranged on the outer side of the spiral blade, the guide hood is arranged on a mounting frame, the mounting frame is fixedly connected to the upper cover plate, and the mounting frame is installed A round tube sleeve concave plate screen and a square hole concave plate screen are arranged in sequence on the surface of one side of the frame away from the guide cover. Both the round tube sleeve concave plate screen and the square hole concave plate screen are connected to the upper cover plate, and a guide plate is arranged on the inner surface of the upper cover plate. On the drum body, along the corn conveying direction, there are a spiral feeding section, a strong threshing section, a repeated threshing section and a debris removal section. The spiral feeding section is a spiral feeding entrance, the strong threshing section is evenly provided with a number of rigid-flexible combined threshing elements, the repeated threshing section is evenly provided with a number of thumb-proof threshing elements, and the debris removal section is evenly provided with a number of debris removal plates.

[0005] As a preferred technical solution of the present invention, the circular tube sleeve concave plate screen includes a plurality of circular tube concave plates distributed along the axis of the drum body, the lower surface of the circular tube concave plate is provided with a fixing rod below the concave plate screen for connecting all the circular tube concave plates, and the inner surface of the circular tube concave plate is evenly provided with a plurality of circular tubes.

[0006] As a preferred technical solution of the present invention, a plurality of nylon sleeves are sleeved on the outer side of the circular tube.

[0007] As a preferred technical solution of the present invention, the square hole concave plate screen includes a plurality of square hole concave plates distributed along the axis of the drum body, wherein the square hole concave plate closest to the circular tube concave plate is connected to the circular tube concave plate through the middle support plate of the concave plate screen, and a semicircular ring plate is fixedly provided on the inner surface of the square hole concave plate, and a plurality of square holes are evenly opened on the inner surface of the semicircular ring plate.

[0008] As a preferred technical solution of the present invention, a plurality of cylindrical steel pipes are evenly arranged on the inner surface of the semicircular ring plate.

[0009] As a preferred technical solution of the present invention, the rigid-flexible combined threshing element includes a roller welding base one installed on the outer surface of the roller body, an upper surface of the roller welding base one is welded with arc panel teeth, a limiting groove is provided on the upper part of the side surface of the arc panel teeth, a pin shaft is slidably arranged in the limiting groove, an open pin one is provided in the pin hole provided on the side surface of the pin shaft, a grooved rod block fixed base is fixedly arranged on the end of the pin shaft, a grooved rod threshing element is fixedly arranged on the outer surface of the grooved rod block fixed base by fixing bolts, two spring fixing seats are provided on the upper surface of the roller welding base one, a fixed pillar is fixedly arranged in the spring fixing seat, two sliding cylinders corresponding to the fixed pillars are provided on the lower surface of the grooved rod block fixed base, the sliding cylinder is slidably arranged on the outer surface of the upper part of the fixed pillar, and the outer surfaces of the sliding cylinder and the fixed pillar are sleeved with compression springs, and the bottom of the compression spring is fixedly arranged on the spring fixing seat.

[0010] As a preferred technical solution of the present invention, there are four groups of rigid-flexible combined threshing elements, which are evenly arranged at 90° along the circumferential direction on the outside of the drum body. Each group of rigid-flexible combined threshing elements includes eight rigid-flexible combined threshing elements, which are arranged alternately in two spiral lines.

[0011] As a preferred technical solution of the present invention, the anti-thumb threshing element includes a roller welding base 2 installed on the outer surface of the roller body, and three anti-thumb fixed bases are evenly arranged on the upper surface of the roller welding base 2. A strip hole is opened on the side surface of each anti-thumb fixed base, and an anti-thumb threshing plate is installed in the strip hole of the anti-thumb fixed base through a tightening bolt 1.

[0012] As a preferred technical solution of the present invention, there are eight thumb-proof threshing elements in total, which are evenly arranged at 45° along the circumferential direction on the outer side of the drum body, and adjacent thumb-proof threshing elements are staggered with each other.

[0013] As a preferred technical solution of the present invention, two angle irons are symmetrically arranged on both sides of the side surface of the mounting frame close to the circular tube sleeve type concave plate screen, and a bolt support is installed on the side surface of the circular tube concave plate connected to the mounting frame on the circular tube sleeve type concave plate screen, a stud sleeve is sleeved on the outer side of the bolt support, and a pin hole is provided on the side surface of the end of the bolt support, in which a cotter pin is provided, and a fixing bolt is fixedly provided on the lower surface of the stud sleeve, the fixing bolt passes through the through hole provided on the angle iron, and two fixing nuts are provided on the outer side of the fixing bolt, and the two fixing nuts are respectively provided on the upper and lower sides of the angle iron.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: corn is threshed by a rigid-flexible combined threshing element and a thumb-proof threshing element, which can reduce the impact force on corn ears, reduce the grain breakage rate, and improve the corn threshing profit. At the same time, the concave plate screen is innovatively designed, the conventional grid-type concave plate screen is changed, and an innovative design is made of a round tube sleeve plus square hole combined concave plate screen. The former is equipped with a nylon sleeve on the round tube, and the latter is welded with a cylindrical steel pipe on the square hole, which not only further increases the number of contacts with the corn ears but also reduces the collision with the grains, thereby improving the corn grain threshing rate and further improving the corn threshing profit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 A side view schematic diagram of the structure; Figure 3 For the present invention Figure 1 Schematic diagram of the structure viewed from above; Figure 4 It is a schematic diagram of the structure of the round tube sleeve type concave plate screen and the square hole concave plate screen of the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at A; Figure 6 It is a schematic diagram of threshing sections of the drum of the present invention; Figure 7 It is a partial side view structural schematic diagram of the present invention; Figure 8 It is a structural schematic diagram of the rigid-flexible combined threshing element of the present invention; Fig. 9 It is a side view structural schematic diagram of the rigid-flexible combined threshing element of the present invention; Fig.10It is a structural schematic diagram of the thumb threshing prevention element of the present invention; Fig.11 It is an arrangement diagram of the rigid-flexible combined threshing element of the present invention; Fig.12 It is a schematic diagram of the local structure of the present invention.

[0016] In the figure: 1 upper cover plate, 2 main shaft, 3 spiral feeding port, 301 spiral blade, 4 guide cover, 5 round tube sleeve concave plate screen, 501 fixed rod below the concave plate screen, 502 round tube concave plate, 503 round tube, 504 nylon sleeve, 6 rigid-flexible combined threshing element, 601 roller welding base 1, 602 limit groove, 603 cotter pin 1, 604 pin shaft, 605 arc panel teeth, 606 grain rod threshing element, 607 compression spring, 608 spring fixing seat, 609 grain Rod block fixed base, 610 fixed pillar, 7 square hole concave plate screen, 701 square hole concave plate, 702 cylindrical steel pipe, 8 thumb-proof threshing element, 801 fastening bolt one, 802 drum welding base two, 803 thumb-proof fixed base, 804 thumb-proof threshing plate, 9 drum body, 10 guide plate, 11 debris removal plate, 12 concave plate screen middle support plate, 13 angle iron, 14 bolt pillar, 15 stud sleeve, 16 cotter pin two, 17 fastening bolt two, 18 fastening nut. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-12 The present invention provides a technical solution: a low-damage corn threshing device suitable for high-moisture content corn, comprising a drum main body 9 and an upper cover plate 1 arranged on the upper side of the drum main body 9, the upper cover plate 1 is semi-circular, and a main shaft 2 connected to an external driving device such as a motor is arranged inside the drum main body 9. The main shaft 2 is coaxially arranged with the drum main body 9. The main shaft 2 drives the drum main body 9 to rotate under the drive of the external driving device, thereby threshing the corn.

[0019] A spiral feeding port 3 is provided at the entrance of the drum body 9, and a spiral blade 301 is provided at the spiral feeding port 3. The corn ears pass through the conveying chain rake in front of the threshing device, and driven by the spiral blade 301 of the spiral feeding port 3, enter the drum body 9 and the upper cover 1 of the longitudinal axis corn threshing device for threshing operation; a deflector 4 is fixedly provided on the outer side of the spiral blade 301, and the deflector 4 is set on the mounting frame to assist the corn ears to enter between the drum body 9 and the upper cover 1.

[0020] The mounting frame is fixedly connected to the upper cover plate 1, and a circular tube sleeve type concave plate screen 5 and a square hole concave plate screen 7 are sequentially arranged on the surface of the mounting frame on one side away from the air guide cover 4. The circular tube sleeve type concave plate screen 5 and the square hole concave plate screen 7 are both connected to the upper cover plate 1. Corn ears enter the circular space surrounded by the drum body 9, the upper cover plate 1, the circular tube sleeve type concave plate screen 5 and the square hole concave plate screen 7. The circular tube sleeve type plus square hole type concave plate screen is located below the threshing device, and cooperates with the threshing drum to complete the threshing of corn ears.

[0021] The inner surface of the upper cover plate 1 is provided with a guide plate 10 to guide the flow, so that the corn ears move along the guide plate 10 spirally toward the rear section of the drum body 9 .

[0022] On the drum body 9, along the corn conveying direction, there are a spiral feeding section, a strong threshing section, a complex threshing section and a debris removal section. The spiral feeding section is a spiral feeding port 3. The strong threshing section is evenly provided with a number of rigid-flexible combination threshing elements 6, and the complex threshing section is evenly provided with a number of thumb-proof threshing elements 8. By threshing corn through the rigid-flexible combination threshing elements 6 and the thumb-proof threshing elements 8, the impact force on the corn ears can be reduced, the grain breakage rate can be reduced, and the corn threshing income can be improved.

[0023] The dust removal section is evenly provided with a plurality of dust removal plates 11, and there are four dust removal plates 11, which are evenly arranged at 90 degrees on the circumference of the outer surface of the drum body 9. The threshed corn threshed material is discharged into the dust removal box at the rear through the dust removal plates 9, completing the entire corn cob threshing process.

[0024] The preferred technical solution is that the round tube sleeve concave screen 5 includes several round tube concave plates 502 distributed along the axis of the drum body 9, and the lower surface of the round tube concave plate 502 is provided with a fixing rod 501 below the concave screen for connecting all the round tube concave plates 502, and the inner surface of the round tube concave plate 502 is evenly provided with several round tubes 503. At present, the common types of concave screens mainly include grid concave screens, punching concave screens, and cylindrical steel pipe concave screens. The high height and angularity of the diaphragm on the grid concave screen are the main reasons for the high crushing rate of corn ears. In response to these problems, a combined concave screen is designed, which is a round tube concave screen with a sleeve type, and the diameter of the round tube 503 is thickened to 12mm. This design not only reduces the high crushing rate caused by the high height and angularity of the diaphragm on the traditional grid concave screen, but also increases the high rate of unremoval caused by the smoothness of the punching concave screen.

[0025] A preferred technical solution is that a plurality of nylon sleeves 504 are sleeved on the outer side of the circular tube 503, and the nylon sleeves 504 are directly sleeved on the circular tube 503, so that a portion of the nylon sleeves 504 protrudes more than the circular tube 503, thereby increasing the collision contact with the fruit ears. In addition, the sleeve on the circular tube sleeve concave plate screen is made of nylon material, which can more effectively reduce the collision and impact force on the grains compared to rigid materials, thereby reducing the crushing rate of the grains.

[0026] The preferred technical solution is that the square hole concave plate screen 7 includes a plurality of square hole concave plates 701 distributed along the axis of the drum body 9, wherein the square hole concave plate 701 closest to the circular tube concave plate 502 is interconnected with the circular tube concave plate 502 through the middle support plate 12 of the concave plate screen, and a semicircular ring plate is fixedly provided on the inner surface of the square hole concave plate 701, and a plurality of square holes are evenly opened on the inner surface of the semicircular ring plate, and a plurality of cylindrical steel pipes 702 are evenly provided on the inner surface of the semicircular ring plate. In view of the problems of small threshing amount of corn ears and reduction of collision and impact between corn ears and concave plate screen, a square hole concave plate screen is designed, and a 6mm cylindrical steel pipe 702 is welded in the concave plate screen, which not only increases the ability of corn ears to be transported backwards, but also increases the mutual collision with corn ears.

[0027] The preferred technical solution is that the rigid-flexible combination threshing element 6 includes a roller welding base 601 installed on the outer surface of the roller body 9, and the upper surface of the roller welding base 601 is welded with arc panel teeth 605. The height of the arc panel teeth 605 is higher than the overall height of the rigid-flexible combination threshing element 6, which can achieve double collision and impact on corn ears and solve the problem of high incomplete threshing rate.

[0028] A limiting groove 602 is provided on the upper part of the side surface of the arc panel tooth 605, a pin shaft 604 is slidably provided in the limiting groove 602, a cotter pin 603 is provided in the pin hole provided on the side surface of the pin shaft 604, a grain rod block fixing base 609 is fixedly provided at the end of the pin shaft 604, a grain rod threshing element 606 is fixedly provided on the outer surface of the grain rod block fixing base 609 by fixing bolts, two spring fixing seats 608 are provided on the upper surface of the drum welding base 601, a fixing pillar 610 is fixedly provided in the spring fixing seat 608, and two A slide cylinder corresponding to the fixed pillar 610 is slidably arranged on the outer surface of the upper part of the fixed pillar 610, and a compression spring 607 is sleeved on the outer surface of the slide cylinder and the fixed pillar 610. The bottom of the compression spring 607 is fixedly arranged on the spring fixing seat 608. When the impact force on the corn ear is greater than the maximum bearing capacity of the designed compression spring 607, the threshing element 606 of the rib rod starts to drive the pin shaft 604 to move up and down in the limiting groove 602, and the compression spring 607 starts to compress inwardly, thereby alleviating the rigid impact on the corn ear and reducing the grain breakage rate.

[0029] Further preferably, the present application also optimizes and upgrades the grain bar threshing element 606, deepens the protruding depth of the grain bar and chamfers the protruding grain bar, thereby reducing the impact force on the fruit ears and further reducing the breakage rate.

[0030] The preferred technical solution is that there are four groups of rigid-flexible combination threshing elements 6, and the four groups of rigid-flexible combination threshing elements 6 are evenly arranged at 90° along the circumferential direction on the outside of the drum body 9, and each group of rigid-flexible combination threshing elements 6 includes eight rigid-flexible combination threshing elements 6, which are arranged in two spiral sections in an alternating manner, that is, multiple groups of rigid-flexible combination threshing elements 6 are spirally distributed on the outside of the drum body 9, ensuring that corn can be threshed by the rigid-flexible combination threshing elements 6 for multiple times during the threshing process, thereby improving the threshing rate of corn kernels.

[0031] The rigid-flexible combined threshing element mainly combines the rigidity of cast iron and the flexibility of the spring. When the corn ear reaches the maximum bearing capacity of the designed spring, the spring begins to compress inward, thereby alleviating the rigid impact on the corn ear and reducing the grain breakage rate.

[0032] The preferred technical solution is that the thumb-proof threshing element 8 comprises a second roller welding base 802 installed on the outer surface of the roller body 9, three thumb-proof fixed bases 803 are evenly arranged on the upper surface of the second roller welding base 802, and each of the thumb-proof fixed bases 803 has a strip hole on its side surface, and a thumb-proof threshing plate 804 is installed in the strip hole of the thumb-proof fixed base 803 through a fixing bolt 801, and a plurality of arc blocks are arranged on the upper surface of the thumb-proof threshing plate 804, which contacts the outer side of the corn for threshing through the arc blocks; the thumb-proof fixed base 803 and the thumb-proof threshing plate 804 are fixed by a fixing bolt 801 and are height-adjustable, so as to be applicable to different threshing sections of the threshing roller, such as the height of the thumb-proof threshing plate 804 is higher towards the rear to improve the threshing rate.

[0033] A preferred technical solution is that a total of eight anti-threshing elements 8 are provided, and the eight anti-threshing elements 8 are evenly arranged at 45° along the circumferential direction on the outside of the drum body 9, and adjacent anti-threshing elements 8 are staggered with each other, and the anti-threshing elements are arranged on the drum in an oblique manner, which can effectively reduce the direct frontal collision and impact on the corn ears, and further reduce the breakage rate.

[0034] By threshing corn with the rigid-flexible combined threshing element 6 and the thumb-proof threshing element 8, the impact force on the corn cobs can be reduced, the grain breakage rate can be reduced, and the corn threshing profit can be improved.

[0035] In order to adapt to the convenience of threshing and testing of more crops, the present application also designs a gap adjustment mechanism, specifically as follows Fig.12As shown: two angle irons 13 are symmetrically arranged on both sides of the side surface of the mounting frame near the round tube sleeve type concave plate screen 5, and a bolt support 14 is installed on the side surface of the round tube concave plate 502 connected to the mounting frame on the round tube sleeve type concave plate screen 5, and a stud sleeve 15 is sleeved on the outer side of the bolt support 14, and a pin hole is opened on the side surface of the end of the bolt support 14, and a cotter pin 16 is arranged in the pin hole for fixing the stud sleeve 15; a fixing bolt 17 is fixedly arranged on the lower surface of the stud sleeve 15, and the fixing bolt 17 passes through the through hole opened on the angle iron 13, and the outer side of the fixing bolt 17 Two fixing nuts 18 are provided, and the two fixing nuts 18 are respectively arranged on the upper and lower sides of the angle iron 13. By moving the fixing bolt 17 up and down, the bolt support 14 can be driven to move up and down through the fixed stud sleeve 15. At the same time, the connecting bolts between the circular tube sleeve type concave plate screen 5 and the square hole concave plate screen 7 and the upper cover plate 1 are adjusted and fixed, etc., so that the gap between the circular tube sleeve type concave plate screen 5 and the square hole concave plate screen 7 and the drum body 9 can be adjusted, so that the present application can thresh corn of different sizes or other crops that need to be threshed, thereby improving universality.

[0036] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-damage corn threshing device suitable for high-moisture content corn, comprising a drum body (9) and an upper cover plate (1) arranged on the upper side of the drum body (9), characterized in that: A main shaft (2) connected to an external driving device is arranged in the drum body (9), the main shaft (2) and the drum body (9) are arranged coaxially, a spiral feeding port (3) is arranged at the inlet of the drum body (9), a spiral blade (301) is arranged at the spiral feeding port (3), a flow guide cover (4) is fixedly arranged outside the spiral blade (301), the flow guide cover (4) is arranged on a mounting frame, the mounting frame is fixedly connected to the upper cover plate (1), and a round tube sleeve type concave plate screen (5) is arranged in sequence on a side surface of the mounting frame away from the flow guide cover (4) and a square hole concave plate screen (7), the round tube sleeve concave plate screen (5) and the square hole concave plate screen (7) are both connected to the upper cover plate (1), and the inner surface of the upper cover plate (1) is provided with a guide plate (10); the drum body (9) is provided with a spiral feeding section, a strong threshing section, a repeated threshing section and a debris removal section in sequence along the corn conveying direction, the spiral feeding section is a spiral feeding inlet (3), the strong threshing section is evenly provided with a plurality of rigid-flexible combined threshing elements (6), the repeated threshing section is evenly provided with a plurality of thumb-proof threshing elements (8), and the debris removal section is evenly provided with a plurality of debris removal plates (11).

2. The low-damage corn threshing device suitable for high-moisture content corn according to claim 1, characterized in that: The circular tube sleeve type concave plate screen (5) comprises a plurality of circular tube concave plates (502) distributed along the axis of the drum body (9); a concave plate screen lower fixing rod (501) for connecting all the circular tube concave plates (502) is provided on the lower surface of the circular tube concave plates (502); and a plurality of circular tubes (503) are evenly provided on the inner surface of the circular tube concave plates (502).

3. The low-damage corn threshing device suitable for high-moisture content corn according to claim 2, characterized in that: A plurality of nylon sleeves (504) are sleeved on the outer side of the circular tube (503).

4. The low-damage corn threshing device suitable for high-moisture content corn according to claim 2, characterized in that: The square hole concave plate screen (7) comprises a plurality of square hole concave plates (701) distributed along the axis of the drum body (9), wherein a square hole concave plate (701) closest to the circular tube concave plate (502) is connected to the circular tube concave plate (502) via a middle support plate (12) of the concave plate screen, and a semicircular ring plate is fixedly provided on the inner surface of the square hole concave plate (701), and a plurality of square holes are evenly opened on the inner surface of the semicircular ring plate.

5. The low-damage corn threshing device suitable for high-moisture content corn according to claim 4, characterized in that: A plurality of cylindrical steel pipes (702) are evenly arranged on the inner surface of the semicircular ring plate.

6. The low-damage corn threshing device suitable for high-moisture content corn according to claim 1, characterized in that: The rigid-flexible combined threshing element (6) comprises a roller welding base (601) mounted on the outer surface of a roller body (9); an arc plate tooth (605) is welded on the upper surface of the roller welding base (601); a limiting groove (602) is provided on the upper part of the side surface of the arc plate tooth (605); a pin shaft (604) is slidably provided in the limiting groove (602); a cotter pin (603) is provided in a pin hole provided on the side surface of the pin shaft (604); a grain rod block fixing base (609) is fixedly provided at the end of the pin shaft (604); and the outer surface of the grain rod block fixing base (609) is fixedly provided with a fixed A threshing element (606) is fixedly provided with a fixed bolt, two spring fixing seats (608) are provided on the upper surface of the roller welding base (601), a fixed pillar (610) is fixedly provided in the spring fixing seat (608), and two slide cylinders corresponding to the fixed pillar (610) are provided on the lower surface of the threshing base (609) of the threshing rod block, the slide cylinders are slidably provided on the upper outer surface of the fixed pillar (610), and compression springs (607) are sleeved on the outer surfaces of the slide cylinders and the fixed pillar (610), and the bottom of the compression spring (607) is fixedly provided on the spring fixing seat (608).

7. The low-damage corn threshing device suitable for high-moisture content corn according to claim 6, characterized in that: There are four groups of rigid-flexible combined threshing elements (6) in total. The four groups of rigid-flexible combined threshing elements (6) are evenly arranged at 90° along the circumferential direction on the outer side of the drum body (9). Each group of rigid-flexible combined threshing elements (6) includes eight rigid-flexible combined threshing elements (6) arranged in two sections of spiral lines in an alternating manner.

8. The low-damage corn threshing device suitable for high-moisture content corn according to claim 1, characterized in that: The thumb-proof threshing element (8) comprises a second roller welding base (802) mounted on the outer surface of a roller body (9); three thumb-proof fixing bases (803) are evenly arranged on the upper surface of the second roller welding base (802); a strip hole is opened on the side surface of each thumb-proof fixing base (803); and a thumb-proof threshing plate (804) is installed in the strip hole of the thumb-proof fixing base (803) via a fixing bolt (801).

9. The low-damage corn threshing device suitable for high-moisture content corn according to claim 8, characterized in that: A total of eight thumb-threshing prevention elements (8) are provided, and the eight thumb-threshing prevention elements (8) are evenly arranged at 45° along the circumferential direction on the outer side of the drum body (9), and adjacent thumb-threshing prevention elements (8) are arranged in an interlaced manner.

10. The low-damage corn threshing device suitable for high-moisture content corn according to claim 1, characterized in that: Two angle irons (13) are symmetrically arranged on both sides of the side surface of the mounting frame close to the circular tube sleeve type concave plate screen (5); a bolt support (14) is installed on the side surface of the circular tube concave plate (502) on the circular tube sleeve type concave plate screen (5) connected to the mounting frame; a stud sleeve (15) is sleeved on the outer side of the bolt support (14); a pin hole is provided on the side surface of the end of the bolt support (14) and a second cotter pin (16) is provided in the pin hole; a second fixing bolt (17) is fixedly arranged on the lower surface of the stud sleeve (15); the second fixing bolt (17) passes through a through hole provided on the angle iron (13); and two fixing nuts (18) are provided on the outer side of the second fixing bolt (17); the two fixing nuts (18) are respectively arranged on the upper and lower sides of the angle iron (13).

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