CN110337919B

CN110337919B - Corn ear threshing device

Info

Publication number: CN110337919B
Application number: CN201910735765.2A
Authority: CN
Inventors: 徐立友; 魏俊; 赵思夏; 刘孟楠; 周晓亮; 张帅; 徐锐良
Original assignee: Henan University of Science and Technology
Current assignee: Henan University of Science and Technology
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2023-05-26
Anticipated expiration: 2039-08-09
Also published as: CN110337919A

Abstract

The invention relates to the field of agricultural machinery equipment, in particular to a corn ear threshing device. The threshing machine comprises a cylindrical shell and three threshing rollers longitudinally arranged in the inner cavity of the shell along the shell, wherein the three threshing rollers are distributed in a delta shape, the steering direction of two of the three threshing rollers is opposite to the steering direction of the rest one, threshing gaps for kneading and threshing the ears along with the rotation of the threshing rollers are formed in the middle positions of the three threshing rollers, the three threshing rollers are all inclined to the axial direction of the shell at the same angle, one end of the threshing gap is wider, a feed port for the ears to enter the threshing gap longitudinally is formed, the other end of the threshing gap is narrower, a discharge port for the ears to be discharged after threshing is formed, and a gap adjusting mechanism for automatically adjusting the width of the threshing gap to adapt to threshing of the ears with different specifications is arranged between any threshing roller and the shell. The corn ear threshing machine has good adaptability to corn ear threshing and high threshing efficiency.

Description

Corn ear threshing device

Technical Field

The invention relates to the field of agricultural machinery equipment, in particular to a corn ear threshing device.

Background

Corn is one of the most important non-ration grain crops in China, and is used as a traditional food, a feed or an industrial raw material, the demand of the corn is increased year by year, and the planting area is also continuously increased. In the corn harvesting process, threshing and harvesting are carried out by a threshing device in a combine harvester in one-time combined harvesting, and threshing and harvesting by a threshing machine and manual threshing and harvesting in segmented harvesting are extremely important links. In the grain harvesting, most important is threshing, most of threshing devices and threshing machines of a corn grain harvester at the current stage are threshing by matching a roller with a concave plate, the threshing devices are improved by threshing devices of wheat and rice, the peeling and threshing are simultaneously carried out, corn husks are easily broken while corn ears are threshed, and the impurity content of the harvested grains is high; the threshing cylinder rotates at a high speed, and the threshing elements and the concave plates of the threshing cylinder are flexibly processed, such as the working parts of the threshing elements and the concave plates are covered by rubber, but the damage of the threshing elements and the concave plates along with seeds is still quite large. One of the great problems of threshing drum-type threshing device is uneven threshing, and the one-time harvest in China at the present stage does not solve the uneven threshing well, and the corn cob still has corn kernels with small area after threshing. In summary, the corn grain threshing device in the current stage has weak pertinence and adaptability to corn threshing, can damage corn grains too much, and has impurity content and threshing rate which do not meet certain requirements.

Disclosure of Invention

The invention aims to provide a corn ear threshing device which has good adaptability to corn ear threshing and high threshing efficiency.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a corn ear threshing device, including tubular casing and three threshing roller that set up in the casing inner chamber along the casing longitudinal direction, three threshing roller is the reverse with the steering of remaining one of three threshing roller of the steering of two of three threshing roller in the font distribution, form the threshing gap that is used for rubbing the threshing to the ear along with the rotation of threshing roller in the intermediate position of three threshing roller, three threshing roller all are with the axial distribution of same angle slope in the casing, make the one end of threshing gap wider and form the feed inlet that supplies the ear to get into the threshing gap along longitudinal direction, the other end is narrower and form the discharge gate that supplies the ear to thresh the back to discharge, all be equipped with the clearance adjustment mechanism that is used for automatically regulated threshing gap width in order to adapt to different specification ears threshing between arbitrary threshing roller and casing.

Preferably, the roll shafts at the end parts of the threshing rolls are all installed in the bearing seats in a rotating fit manner, and strip-shaped sliding grooves for the bearing seats to be in sliding fit are arranged at the end parts of the machine shell and distributed along the radial direction of the machine shell.

Preferably, a threshing cover is arranged on one side of the threshing roller, which is opposite to the threshing gap, and two ends of the threshing cover are respectively fixed on bearing seats positioned at two ends of the corresponding threshing roller.

Preferably, any one gap adjusting mechanism comprises a reset spring and a double-cavity hydraulic cylinder, wherein two ends of the reset spring are respectively fixed on the inner wall of the shell and the threshing cover, a piston rod of the double-cavity hydraulic cylinder is fixedly connected with the threshing cover, a cylinder body is fixedly connected with the inner wall of the shell, and a rod cavity and a rodless cavity of the cylinder body are respectively connected with the same hydraulic oil tank through damping valves; the damping valve comprises a cylindrical valve body, a valve plate fixed in the valve body, a valve core arranged in the valve body in a sliding manner and positioned at one side of the valve plate towards the cylinder body, and a damping spring used for connecting the valve plate and the valve core, wherein the valve plate is provided with an oil duct which is longitudinally penetrated and arranged along the valve body, the valve core comprises an annular base plate which is matched with the inner wall of the valve body to slide, and a cone core which is arranged at the inner hole position of the annular base plate and is distributed towards the valve plate, the cone core can slide into the oil duct along with the longitudinal sliding of the annular base plate, a damping oil hole is arranged at the position, which is positioned in the slidable oil duct, on the cone core, and a conventional oil hole is arranged at the position, which is positioned in the non-slidable oil duct, on the cone core.

Preferably, the damping oil hole is formed in the conical top position of the conical core, and the conventional oil hole is formed in the base part of the conical core, which is connected with the annular substrate.

Preferably, the number of the damping oil holes is multiple, the damping oil holes are uniformly distributed at intervals at the cone top position of the cone core, a plugboard is inserted in the valve plate in a penetrating manner along the radial direction of the valve body, one end of the plugboard is positioned outside the valve body, and the other end of the plugboard is positioned inside the valve body and can be tightly contacted with the cone top position of the cone core, so that part of the damping oil holes can be plugged through sliding of the plugboard along the radial direction of the valve body.

Preferably, the valve plate is made of rubber materials, and slots which are communicated with each other and used for sliding fit of the plugboard are formed in the valve plate and the valve body at the corresponding position.

Preferably, the threshing roller comprises a wear-resistant rubber roller cover and an iron core, and a spiral line for assisting the ears in the threshing gap to move from the feed inlet to the discharge outlet is arranged on the wear-resistant rubber roller cover.

Preferably, the pitch of the spiral line is gradually increased from the feeding port to the discharging port and is distributed at equal intervals at the position of the discharging port.

Preferably, a plurality of flexible threshing elements are arranged on the wear-resistant rubber roller skin at intervals.

Advantageous effects

The threshing machine is designed aiming at corn ear threshing, has good adaptability to corn ear threshing, and reduces damage to corn kernels compared with a roller threshing device due to the adoption of the rubber roller as the threshing roller. In the preferred embodiment, the threshing roller is provided with flexible threshing elements which are arranged according to a spiral line, the flexible threshing elements at the front section of the threshing roller are densely arranged, the corn ear advancing speed along the threshing roller is slower, the rotating circumferential speed around the axis of the threshing roller is larger, and the main threshing is completed; the rear threshing elements are not densely arranged, the corn ears move along the threshing roller at a higher speed, the rotating circumferential speed around the axis of the corn ears is lower, the damage to seeds is reduced, the kneading time of corn cobs is shortened, the threshing rate is improved, and the impurity content is reduced.

The threshing mechanism comprises three gap adjusting mechanisms which are matched with each other, and the reset spring in the mechanism can enable the threshing gap to be automatically adjusted in width according to the specification of the fed clusters, so that the threshing smoothness can be improved, the threshing rate can be improved, the damage to the seeds can be reduced, and the threshing work can be completed better; the double-cavity hydraulic cylinder in the mechanism is matched with the use of the hydraulic oil tank and the damping valve, so that the adjustment of the threshing gap width has damping property, and the problem that three threshing rollers rapidly move towards the middle of the shell under the action of the reset spring after the threshing of the ears is completed and discharged, so that the integral vibration is overlarge and the service life of the reset spring is reduced can be avoided.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view showing a partially enlarged structure of a threshing roller part in the present invention;

FIG. 4 is an oil circuit diagram of a dual chamber cylinder portion in the lash adjustment mechanism of the present invention;

FIG. 5 is a schematic cross-sectional view of a damping valve portion of the present invention in a non-damping state;

FIG. 6 is a schematic cross-sectional view of a damping valve portion of the present invention in a state where less damping is generated;

FIG. 7 is a schematic cross-sectional view of a damper valve portion of the present invention in a state where a large damping is generated;

the marks in the figure: 1. the device comprises a shell, 2, a gap adjusting mechanism, 3, a return spring, 4, a double-cavity hydraulic cylinder, 401, a cylinder body, 401-1, a rodless cavity, 401-2, a rod cavity, 402, a piston rod, 5, a threshing roller, 6, a threshing gap, 7, a threshing cover, 8, a strip-shaped chute, 9, a bearing seat, 10, a hydraulic oil tank, 11, a damping valve, 1101, a valve plate, 1102, a valve body, 1103, a valve core, 1103-1, a cone core, 1103-2, an annular substrate, 1104, a damping spring, 12, an oil duct, 13, a plugboard, 14, a damping oil hole, 15, a conventional oil hole, 16, a flexible threshing element, 17 and a spiral line.

Detailed Description

Referring to fig. 1 and 2, the corn ear threshing device of the invention comprises a cylindrical shell 1 and three threshing rollers 5 longitudinally arranged in the inner cavity of the shell 1 along the shell 1. The three threshing rollers 5 are distributed in a delta shape, so that threshing gaps 6 are formed in the middle positions of the three threshing rollers 5. The three threshing rollers 5 are all inclined to the axial direction of the shell 1 at the same angle, so that one end of the threshing gap 6 is wider and forms a feed inlet for the ears to enter the threshing gap 6 longitudinally, and the other end is narrower and forms a discharge outlet for the corncob after the ears are threshed. The three threshing rollers 5 are set to have the same rotation direction and rotation speed, and the rotation direction of two of the three threshing rollers is opposite to the rotation direction of the other three threshing rollers and the rotation speed of the other three threshing rollers is larger, so that the ears are rubbed by the rotation of the threshing rollers 5 after entering the threshing gap 6 from the feed inlet, and threshing is completed; in the threshing process, the ears rotate along the axis of the ears and translate towards the direction of the discharge port until the corncob after threshing is discharged from the discharge port. Correspondingly, a first opening and a second opening corresponding to the feed inlet and the discharge outlet are respectively arranged at two ends of the shell 1, the first opening is arranged at the rear of the peeling roller, and peeled corn ears directly enter the feed inlet through the first opening. A third opening for discharging corn kernels falling between the two threshing rollers 5 is formed in the bottom of the machine shell 1.

In the embodiment, the threshing roller 5 comprises a wear-resistant rubber roller cover and an iron core, and damage to corn kernels in the threshing process of the threshing roller 5 is reduced through the wear-resistant rubber roller cover. As shown in fig. 3, a spiral line 17 is arranged on the wear-resistant rubber roller skin, and the spiral line 17 is used for assisting the ears in the threshing gap 6 to move from the feed inlet to the discharge outlet, and on the other hand, the roughness of the surface of the threshing roller 5 is increased, and the threshing capacity of the threshing roller 5 is improved. The pitch of the spiral line 17 is gradually increased from the feed inlet to the discharge outlet and is distributed at equal intervals at the position of the discharge outlet. The threshing capacity of the threshing roller 5 at the front end can be increased, and the damage of corn kernels at the rear end of the threshing roller 5 can be reduced. A plurality of flexible threshing elements 16 are arranged on the wear-resistant rubber roll skin at intervals. The arrangement mode of the plurality of flexible threshing elements 16 is that the flexible threshing elements 16 are arranged according to the spiral lines 17 on the threshing roller 5, the threshing capacity of the threshing roller 5 is mainly increased, and the damage to corn kernels is reduced as much as possible while the threshing capacity is increased by adopting the flexible threshing elements 16. The flexible threshing elements 16 at the front section of the threshing roller 5 are densely arranged, the corn ears move forward along the axis of the threshing gap 6 at a slower speed, and the rotating circumferential speed around the axis of the corn ears is larger. The main threshing is finished, the arrangement of the threshing elements at the rear stage is not dense, the corn ears move forward along the threshing roller 5 at a higher speed, the rotating circumferential speed around the axis of the corn ears is lower, the damage to the seeds is reduced, the kneading time of the corn ears is reduced, and the impurity content is reduced. The flexible threshing element 16 in the invention performs threshing perpendicular to the axis of the corn ears, accords with the threshing mechanical property of corn kernels, and greatly reduces the damage rate of the kernels compared with threshing performed by parallel axes.

The roll shafts at the end parts of the threshing rolls 5 are all arranged in a bearing seat 9 in a rotating fit manner, and the end part of the machine shell 1 is provided with strip-shaped sliding grooves 8 which are used for the sliding fit of the bearing seat 9 and are distributed along the radial direction of the machine shell 1. So that the three threshing rollers 5 can move along the radial direction of the shell 1 under the action of external force, thereby changing the width of the threshing gap 6 to adapt to threshing of corn ears with different specifications. The threshing roller 5 is provided with a threshing cover 7 on one side opposite to the threshing gap 6, and the two ends of the threshing cover 7 are respectively fixed on bearing seats 9 positioned at the two ends of the corresponding threshing roller 5, so that the threshing cover 7 cannot rotate along with the threshing roller 5. A gap adjusting mechanism 2 for automatically adjusting the width of the threshing gap 6 to adapt to threshing of different specifications of ears is arranged between any threshing cover 7 and the machine shell 1.

The gap adjusting mechanism 2 comprises a return spring 3 and a double-cavity hydraulic cylinder 4 which are connected in parallel, and the three gap adjusting mechanisms 2 mutually form an included angle of 120 degrees. As shown in fig. 1, in this embodiment, one end of the return spring 3 far away from the threshing roller 5 and the cylinder body 401 of the double-cavity hydraulic cylinder 4 are fixed on a first connecting plate at intervals, and the first connecting plate is fixedly connected with the inner wall of the casing 1. One end of the return spring 3 close to the threshing roller 5 and a piston rod 402 of the double-cavity hydraulic cylinder 4 are fixed on a second connecting plate at intervals, and the second connecting plate is fixed on the outer side of the corresponding threshing cover 7. When the diameter of the corn ears is larger than the gap of the feed inlet, the reset spring 3 is extruded to enlarge the threshing gap 6, so that the threshing device can be just suitable for corn ears with the diameter, the smoothness of threshing is enhanced, the corn ears are prevented from being damaged by seeds possibly caused when being extruded and rubbed by the three threshing rollers 5, and the vibration of the threshing device is reduced.

After corn ears are threshed, the reset spring 3 has a tendency of quick rebound after the corn ears are discharged from the discharge hole, so that the threshing roller 5 is quickly reset, the threshing device is easy to vibrate violently, the reset spring 3 is reciprocated to stretch greatly, and the service life is reduced. The present invention overcomes the above problems by providing a dual chamber hydraulic cylinder 4 in parallel with the return spring 3. As shown in fig. 4, the rod-shaped chamber 401-2 and the rod-free chamber 401-1 of the cylinder 401 are connected to the same hydraulic oil tank 10 through damping valves 11, respectively, and hydraulic oil can flow between the rod-free chamber 401-1, the rod-shaped chamber 401-2, and the hydraulic oil tank 10 through the corresponding damping valves 11. As shown in fig. 6, the damper valve 11 includes a cylindrical valve body 1102, a valve plate 1101 fixed in the valve body 1102, a spool 1103 slidably provided in the valve body 1102 and located at a position of the valve plate 1101 toward the cylinder 401 side, and a damper spring 1104 for connecting the valve plate 1101 and the spool 1103. The valve plate 1101 has an oil passage 12 extending longitudinally through the valve body 1102. The valve core 1103 comprises an annular base plate 1103-2 which is used for sliding in a matched manner with the inner wall of the valve body 1102, and a cone core 1103-1 which is arranged at the inner hole position of the annular base plate 1103-2 and is distributed towards the direction of the valve plate 1101, wherein the cone core 1103-1 can slide into the oil duct 12 along with the sliding of the annular base plate 1103-2 along the longitudinal direction of the valve body 1102, a damping oil hole 14 is formed in the cone core 1103-1 at the cone top position which can slide into the oil duct 12, and the damping oil hole 14 can play a role of communicating the cylinder 401 with the hydraulic oil tank 10 in any state. A conventional oil hole 15 is provided in the cone 1103-1 at a position not slidably in the oil passage 12, and the conventional oil hole 15 communicates the cylinder 401 and the hydraulic cylinder only in a state where the cone 1103-1 does not slide in the oil passage 12. The valve plate 1101 is made of a rubber material for completely isolating the passage between the conventional oil hole 15 and the hydraulic oil tank 10 after the cone 1103-1 slides into the oil passage 12.

Through the structure, after corn ears enter the feed inlet of the threshing gap 6, the tail part of the gap adjusting mechanism 2 pushes the piston rod 402 to move upwards, namely, pushes the piston rod 402 to move leftwards in fig. 5, and hydraulic oil flows from the rodless cavity 401-1 on the left side to the rod cavity 401-2 on the right side. During the hydraulic oil flowing, because the corn ears move slowly in the threshing gap 6, the flow velocity of the hydraulic oil pushed by the left moving piston rod 402 does not reach the locking velocity (i.e. the force of the hydraulic oil pushing the valve core 1103 in the left damping valve 11 shown in fig. 5 does not overcome the elastic force of the damping spring 1104, and the hydraulic oil can still flow out from two sides of the conventional oil holes 15 in the valve core 1103). When the corn ears are threshed, the threshing roller 5 moves downwards after the corn ears leave the threshing roller 5, and the head is driven to move downwards, namely the piston rod 402 moves rightwards rapidly in fig. 5. At this time, the flow rate of the hydraulic oil is enough to overcome the elasticity of the damping spring 1104 to push the valve core 1103 to move upwards, so that the hydraulic oil cannot flow out of the conventional oil holes 15 on two sides and can only flow out through the damping oil holes 14, and at this time, the piston rod 402 moves rightwards slowly, so that the threshing roller 5 is reset slowly, and on one hand, the reduction of the service life caused by the vibration of the threshing roller 5 and the repeated and substantial expansion of the reset spring 3 is avoided. On the other hand, the feed inlet of the threshing gap 6 can quickly receive the corn cluster of another corn.

The above situation is suitable for threshing corn ears with similar specifications and sizes in the same batch. When the diameter of the corn ears is uneven due to the influence of sunlight moisture or the mixing of multiple batches, the damping of the gap adjusting mechanism 2 can be reduced to accelerate the re-springing speed of the return spring 3, so that the threshing roller 5 is quickly reset, and the threshing roller 5 is quickly adapted to the threshing of the next smaller corn ears after the threshing of one larger corn ear is completed. The threshing mode has the advantages that although the corn threshing mode has a certain degree of grain damage, the corn threshing device has a certain vibration and the service life of the spring is reduced, the threshing rate of corn ears can be ensured, and the corn ears are fully threshed. The change of the damping of the gap adjusting mechanism 2 is realized by the following structure:

the number of the damping oil holes 14 is multiple, the damping oil holes 14 are uniformly distributed at intervals at the cone top position of the cone 1103-1, the insertion plate 13 is inserted in the valve plate 1101 in a penetrating and sliding manner along the radial direction of the valve body 1102, one end of the insertion plate 13 is positioned outside the valve body 1102, and the other end of the insertion plate 13 is positioned inside the valve body 1102 and can be in tight contact with the cone top position of the cone 1103-1, so that part of the damping oil holes 14 can be blocked by sliding of the insertion plate 13 along the radial direction of the valve body 1102. Slots which are communicated with each other and are used for sliding fit of the plugboard 13 are formed on the valve plate 1101 and the valve body 1102 at corresponding positions. When the damping of the gap adjusting mechanism 2 needs to be increased, the insert plate 13 can be inserted towards the inside of the valve body 1102, as shown in fig. 7, so as to block the damping oil holes 14 as much as possible; when it is necessary to reduce the damping of the lash adjustment mechanism 2, the insert plate 13 may be pulled outward as shown in fig. 6 to reduce the number of the damping oil holes 14 blocked by the insert plate 13. Because the valve plate 1101 is made of rubber materials, the inserting plate 13 is tightly matched with the inserting grooves formed in the valve plate 1101, so that hydraulic oil can be prevented from leaking.

Claims

1. The utility model provides a corn ear threshing device which characterized in that: the threshing machine comprises a cylindrical shell (1) and three threshing rollers (5) longitudinally arranged in the inner cavity of the shell (1) along the shell (1), wherein the three threshing rollers (5) are distributed in a delta shape, the rotation direction of two of the three threshing rollers (5) is opposite to that of the rest one, threshing gaps (6) for kneading and threshing the ears along with the rotation of the threshing rollers (5) are formed in the middle positions of the three threshing rollers (5), the three threshing rollers (5) are all inclined to the axial distribution of the shell (1) at the same angle, one end of the threshing gaps (6) is wider, a feed inlet for the ears to enter the threshing gaps (6) longitudinally is formed, the other end of the threshing gaps is narrower, a discharge outlet for the ears to be threshed is formed, and a gap adjusting mechanism (2) for automatically adjusting the width of the threshing gaps (6) to adapt to the threshing of the ears with different specifications is arranged between any threshing roller (5) and the shell (1);

the roll shafts at the end parts of the threshing rolls (5) are all arranged in a bearing seat (9) in a rotating fit manner, a strip-shaped chute (8) for sliding fit of the bearing seat (9) is arranged at the end part of the machine shell (1), and the strip-shaped chute (8) is distributed along the radial direction of the machine shell (1);

one side of the threshing roller (5) opposite to the threshing gap (6) is provided with a threshing cover (7), and two ends of the threshing cover (7) are respectively fixed on bearing seats (9) positioned at two ends of the corresponding threshing roller (5);

any one gap adjusting mechanism (2) comprises a reset spring (3) and a double-cavity hydraulic cylinder (4), two ends of the reset spring (3) are respectively fixed on the inner wall of the shell (1) and the threshing cover (7), a piston rod (402) of the double-cavity hydraulic cylinder (4) is fixedly connected with the threshing cover (7), a cylinder body (401) is fixedly connected with the inner wall of the shell (1), and a rod cavity (401-2) and a rodless cavity (401-1) of the cylinder body (401) are respectively connected to the same hydraulic oil tank (10) through a damping valve (11); the damping valve (11) comprises a cylindrical valve body (1102), a valve plate (1101) fixed in the valve body (1102), a valve core (1103) slidably arranged in the valve body (1102) and positioned at one side of the valve plate (1101) towards the cylinder body (401), and a damping spring (1104) for connecting the valve plate (1101) and the valve core (1103), wherein the valve plate (1101) is provided with an oil duct (12) longitudinally penetrating through the valve body (1102), the valve core (1103) comprises an annular base plate (1103-2) for sliding with the inner wall of the valve body (1102) in a matching manner and a cone core (1103-1) arranged at the inner hole position of the annular base plate (1103-2) and distributed towards the direction of the valve plate (1101), the cone core (1103-1) can partially slide into the oil duct (12) along with the longitudinal sliding of the annular base plate (1103-2), a damping oil hole (14) is formed in the position of the cone core (1103-1) which is positioned in the slidable oil duct (12), and a conventional oil hole (15) is formed in the position of the cone core (1103-1) which is positioned in the non-slidable oil duct (12).

2. A corn ear threshing device as defined in claim 1, wherein: the damping oil hole (14) is formed in the cone top position of the cone core (1103-1), and the conventional oil hole (15) is formed in the base part of the cone core (1103-1) connected with the annular substrate (1103-2).

3. A corn ear threshing device as defined in claim 2, wherein: the number of the damping oil holes (14) is multiple, the damping oil holes (14) are uniformly distributed at intervals at the cone top position of the cone core (1103-1), the insertion plate (13) is inserted in the valve plate (1101) in a penetrating manner along the radial direction of the valve body (1102), one end of the insertion plate (13) is positioned outside the valve body (1102), and the other end of the insertion plate is positioned inside the valve body (1102) and can be tightly contacted with the cone top position of the cone core (1103-1), so that part of the damping oil holes (14) can be blocked by sliding the insertion plate (13) along the radial direction of the valve body (1102).

4. A corn ear threshing device as defined in claim 3, wherein: the valve plate (1101) is made of rubber materials, and slots which are communicated with each other and used for sliding fit of the plugboard (13) are formed in the valve plate (1101) and the valve body (1102) at the corresponding position.

5. A corn ear threshing device as defined in claim 1, wherein: the threshing roller (5) comprises a wear-resistant rubber roller cover and an iron core, and a spiral line (17) for assisting the ears in the threshing gap (6) to move from the feed inlet to the discharge outlet is arranged on the wear-resistant rubber roller cover.

6. The corn ear threshing device of claim 5, wherein: the screw pitch of the spiral line (17) is gradually increased from the feed inlet to the discharge outlet and is distributed at equal intervals at the position of the discharge outlet.

7. The corn ear threshing device of claim 5, wherein: a plurality of flexible threshing elements (16) are arranged on the wear-resistant rubber roller skin at intervals.