Grain re-threshing drum, re-threshing and cleaning device and combine harvester

Abstract

The present invention relates to a grain re-threshing drum, a re-threshing and cleaning device, and a combine harvester. The combine harvester comprises a vehicle body, on which a re-threshing and cleaning device is installed, the re-threshing and cleaning device comprises a grain re-threshing drum, the grain re-threshing drum comprises an outer cylinder, two ends of the outer cylinder are respectively provided with a feed inlet and a discharge outlet, an inner cylinder is coaxially arranged inside the outer cylinder, the outer cylinder is rotatably assembled with the inner cylinder, at least one of the inner surface of the outer cylinder or the outer surface of the inner cylinder is provided with an agitator blade for conveying materials, a material conveying channel is formed between the inner and outer cylinders, and a pressure roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush and thresh the grains passing through. When harvesting millet using the combine harvester of the present invention, the pressure roller crushes the grains to effectively thresh the grains, and can effectively remove the grains, which greatly improves the grain removal rate and the harvesting efficiency of the whole machine.

Description

Technical Field

[0001] The invention relates to a grain re-thresher drum, a re-thresher cleaning device and a combine harvester. Background Art

[0002] Millet is a coarse grain crop and a small-grain crop compared to wheat and rice. Each grain is light in weight. There is a main stem in the middle of the ear of grain, and the main stem has multiple branches. Each branch is an independent grain code, and each grain code contains two to three hundred grains.

[0003] At present, millet harvesting in most parts of my country is still mainly done manually. After harvesting by hand or by reaper, thresher is used for on-site threshing, and then simple manual cleaning is performed. In recent years, some companies or farmers have also slightly modified and adjusted wheat or rice combine harvesters to harvest millet. When harvesting grains with this type of modified combine harvester, the stems, branches and ears of grain cut off by the cutter enter the threshing drum for threshing together. The processed grains contain a large amount of stems and unprocessed grains, which makes it difficult to separate the stems, branches and grains during the threshing process, and the grains are difficult to remove. The effect of harvesting grains with this type of modified combine harvester is not ideal, and farmers are not very accepting of it. Summary of the invention

[0004] The object of the present invention is to provide a grain re-stripping drum capable of removing grains; the object of the present invention is also to provide a re-stripping and cleaning device having the above-mentioned re-stripping drum; the object of the present invention is also to provide a combine harvester equipped with the above-mentioned re-stripping and cleaning device.

[0005] To achieve the above object, the technical solution of the grain-removing drum of the present invention is:

[0006] Scheme 1, a re-peeling roller, comprises an outer cylinder, wherein two ends of the outer cylinder are respectively provided with a feed port and a discharge port, an inner cylinder is coaxially arranged inside the outer cylinder, the outer cylinder and the inner cylinder are rotatably assembled, at least one of the inner surface of the outer cylinder or the outer surface of the inner cylinder is provided with an agitator blade for conveying grain materials, a conveying channel is formed between the inner and outer cylinders, and a pressing roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush the passing grain materials.

[0007] Beneficial effect: When harvesting millet using a combine harvester equipped with the re-threshing drum of the present invention, the threshed materials (grains, grain fragments, short stalks, etc.) after threshing by the main drum enter the feed channel from the feed port, the pressure roller cooperates with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to achieve the crushing and re-threshing of the grain fragments, the arranged agitator blades transport the re-threshed debris and short stalks to the discharge port, and the fine grains and chaff fall into the cleaning channel through the sieve holes on the inner and outer cylinders, completing the re-threshing, separation and cleaning work, thereby greatly improving the grain fragment threshing rate and the harvesting efficiency of the whole machine.

[0008] Solution 2 is a further improvement on Solution 1, wherein the pressure roller is rotatably mounted on the outer cylinder and the rotation axis is parallel to the axis of the outer cylinder. Rotating the pressure roller on the outer cylinder facilitates the setting and helps to increase the rotation radius of the pressure roller.

[0009] Solution 3 is a further improvement on Solution 2, wherein the pressing rollers are arranged in groups, and the pressing rollers in the same group are evenly distributed on the inner surface of the outer cylinder. The even distribution of the pressing rollers on the inner surface of the outer cylinder helps the pressing rollers and the outer surface of the inner cylinder to roll the grains.

[0010] Solution 4 is a further improvement on Solution 3, wherein the plurality of pressing rollers are provided, and the projections of the pressing rollers in the axial direction of each group overlap. The use of such a design of the pressing rollers is helpful to enhance the pressing strength of the pressing rollers on the grains.

[0011] Scheme 5 is a further improvement on Scheme 4, with two pressing rollers in each group. The two pressing rollers can help improve the grain removal effect on one hand, and help prevent the re-stripping roller from being blocked on the other hand.

[0012] Scheme 6 is a further improvement on any one of schemes 1 to 5, wherein the inner and outer cylinders rotate around their axes and rotate relative to each other. The relative rotation of the inner and outer cylinders facilitates the rolling of the rollers.

[0013] Scheme 7 is a further improvement on Scheme 6. The inner cylinder is the active part, and the outer cylinder is driven to rotate through the planetary gear transmission mechanism. It is convenient to set up and helps to enhance the crushing strength of the grain.

[0014] Solution 8 is a further improvement on Solution 7, wherein the planetary gear transmission mechanism realizes the relative rotation of the inner cylinder and the outer cylinder at a certain transmission ratio. The planetary gear transmission mechanism has high transmission stability.

[0015] Solution 9 is a further improvement on Solution 6, wherein the discharge port is an outer cylinder sieve hole that is circumferentially distributed on the outer cylinder, and the discharge port is staggered with the pressing roller. The discharge port is a sieve hole that helps to enhance the purity of the grains.

[0016] Solution 10 is a further improvement on Solution 9, wherein the inner cylinder body is provided with inner cylinder sieve holes circumferentially corresponding to the positions where the outer cylinder body is provided with the outer cylinder sieve holes. The inner cylinder sieve holes facilitate the falling of grains.

[0017] Scheme 11 is a further improvement on Scheme 10, in which an inner agitator blade is provided at a position on the inner wall of the inner cylinder in the axial direction corresponding to the pressure roller.

[0018] Scheme 12 is a further improvement on any one of schemes 1 to 5, wherein the front end of the outer cylinder is open, and the opening constitutes the feed port, and the inner cylinder is sealed at one end facing the feed port. The feed port is located at the front end of the outer cylinder for easy feeding.

[0019] Scheme 13 is a further improvement on Scheme 12, in which the end of the inner cylinder away from the feed inlet is provided with a debris discharge plate for discharging the residual materials after re-separation.

[0020] Scheme 14 is a further improvement based on any one of schemes 1 to 5, wherein the surface of the pressing roller is provided with a spiral groove for axially conveying the grain material. The spiral groove helps convey the grain material after being crushed by the pressing roller.

[0021] The technical solution of the re-separation and cleaning device of the present invention is:

[0022] Scheme 1, a re-threshing and cleaning device includes a re-threshing drum, which includes an outer cylinder, wherein both ends of the outer cylinder are respectively provided with a feed port and a discharge port, an inner cylinder is coaxially arranged inside the outer cylinder, the outer cylinder and the inner cylinder are rotatably assembled, at least one of the inner surface of the outer cylinder or the outer surface of the inner cylinder is provided with an agitator blade for conveying grain materials, a conveying channel is formed between the inner and outer cylinders, and a pressing roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush the grain materials passing through.

[0023] Beneficial effect: When harvesting millet using a combine harvester equipped with the re-threshing and cleaning device of the present invention, the threshed materials (grains, grain fragments, short stalks, etc.) after threshing by the main drum enter the feed channel from the feed port, and the pressure roller cooperates with the inner surface of the outer drum and / or the outer surface of the inner drum to achieve the crushing and re-threshing of the grain fragments. The inner agitator blades transport the re-threshed debris and short stalks to the discharge port, and the fine grains and chaff fall into the cleaning channel through the sieve holes on the inner and outer drums, completing the re-threshing, separation and cleaning work, thereby greatly improving the grain fragment threshing rate and the harvesting efficiency of the whole machine.

[0024] Solution 2 is a further improvement on Solution 1, wherein the pressure roller is rotatably mounted on the outer cylinder and the rotation axis is parallel to the axis of the outer cylinder. Rotating the pressure roller on the outer cylinder facilitates the setting and helps to increase the rotation radius of the pressure roller.

[0025] Solution 3 is a further improvement on Solution 2, wherein the pressing rollers are arranged in groups, and the pressing rollers in the same group are evenly distributed on the inner surface of the outer cylinder. The even distribution of the pressing rollers on the inner surface of the outer cylinder helps the pressing rollers and the outer surface of the inner cylinder to roll the grains.

[0026] Solution 4 is a further improvement on Solution 3, wherein the plurality of pressing rollers are provided, and the projections of the pressing rollers in the axial direction of each group overlap. The use of such a design of the pressing rollers is helpful to enhance the pressing strength of the pressing rollers on the grains.

[0027] Scheme 5 is a further improvement on Scheme 4, with two pressing rollers in each group. The two pressing rollers can help improve the grain removal effect on one hand, and help prevent the re-stripping roller from being blocked on the other hand.

[0028] Scheme 6 is a further improvement on scheme 1, wherein both the inner and outer cylinders rotate around their axes and rotate relative to each other. The relative rotation of the inner and outer cylinders facilitates the rolling of the rollers.

[0029] Scheme 7 is a further improvement on Scheme 6. The inner cylinder is the active part, and the outer cylinder is driven to rotate through the planetary gear transmission mechanism. It is convenient to set up and helps to enhance the crushing strength of the grain.

[0030] Solution 8 is a further improvement on Solution 7, wherein the planetary gear transmission mechanism realizes the relative rotation of the inner cylinder and the outer cylinder at a certain transmission ratio. The planetary gear transmission mechanism has high transmission stability.

[0031] Solution 9 is a further improvement on Solution 6, wherein the discharge port is an outer cylinder sieve hole that is circumferentially distributed on the outer cylinder, and the discharge port is staggered with the pressing roller. The discharge port is a sieve hole that helps to enhance the purity of the grains.

[0032] Solution 10 is a further improvement on Solution 9, wherein the inner cylinder body is provided with inner cylinder sieve holes circumferentially corresponding to the positions where the outer cylinder body is provided with the outer cylinder sieve holes. The inner cylinder sieve holes facilitate the falling of grains.

[0033] Scheme 11 is a further improvement on Scheme 10, in which an inner agitator blade is provided at a position on the inner wall of the inner cylinder in the axial direction corresponding to the pressure roller.

[0034] Solution 12 is a further improvement on Solution 1, wherein the front end of the outer cylinder is open, and the opening constitutes the feed port, and the inner cylinder is sealed at one end facing the feed port. The feed port is located at the front end of the outer cylinder for easy feeding.

[0035] Scheme 13 is a further improvement on Scheme 12, in which the end of the inner cylinder away from the feed inlet is provided with a debris discharge plate for discharging the residual materials after re-separation.

[0036] Solution 14 is a further improvement on Solution 1, wherein the surface of the pressing roller is provided with a spiral groove for axially conveying the grain material. The spiral groove helps convey the grain material after being crushed by the pressing roller.

[0037] Scheme 15 is further improved on the basis of any one of schemes 1 to 14, wherein a cleaning device is further provided at the lower side of the discharge port, the cleaning device comprises a tubular shell, the tubular shell comprises a feed hopper for receiving the grain material flowing out of the discharge port, a grain outlet located at the lower side of the feed hopper, and a chaff outlet located at the upper side of the grain outlet, and an exhaust fan is provided in the shell between the grain outlet and the chaff outlet. The cleaning device helps to remove impurities and clean the grain after the re-threshing drum is re-threshed, thereby enhancing the purity of the grain.

[0038] Solution 16 is a further improvement on Solution 15, wherein the cylindrical shell is a Z-shaped structure, and the Z-shaped cylindrical shell includes four nodes including two end points and two bending points, and the feed hopper, grain outlet, exhaust fan and chaff outlet are sequentially arranged. The zigzag cylindrical structure helps to enhance the cleaning effect of the cleaning device.

[0039] Solution 17 is a further improvement on Solution 15, wherein the exhaust fan is a cross-flow fan. The cross-flow fan has high exhaust strength, which helps to enhance the cleaning effect of the cleaning device.

[0040] Solution 18 is a further improvement on Solution 15, wherein the feed hopper is an arc-shaped structure surrounding the outer cylinder, and the corresponding central angle of the arc-shaped feed hopper is not less than 180°. The feed hopper adopts this design to facilitate the discharge of the material from the discharge port of the outer cylinder into the feed hopper.

[0041] The technical solution of the combine harvester of the present invention is:

[0042] Scheme 1, a combine harvester includes a vehicle body, on which a re-threshing and cleaning device is installed, the re-threshing and cleaning device includes a re-threshing drum, the re-threshing drum includes an outer cylinder, both ends of the outer cylinder are respectively provided with a feed inlet and a discharge outlet, an inner cylinder is coaxially arranged inside the outer cylinder, the outer cylinder and the inner cylinder are rotatably assembled, at least one of the inner surface of the outer cylinder or the outer surface of the inner cylinder is provided with an agitator blade for conveying grain, a conveying channel is formed between the inner and outer cylinders, and a pressure roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush the passing grain.

[0043] Beneficial effect: When the combine harvester of the present invention is used to harvest millet, the threshing products (grains, grain residues, short stalks, etc.) after threshing by the main drum enter the feed channel from the feed port, and the pressing roller cooperates with the inner surface of the outer drum and / or the outer surface of the inner drum to achieve the crushing and re-threshing of the grain residues. The inner agitator blades transport the re-threshed debris and short stalks to the discharge port, and the fine grains and chaff fall into the cleaning channel through the sieve holes on the inner and outer drums, completing the re-threshing, separation and cleaning work, thereby greatly improving the grain residue threshing rate and the harvesting efficiency of the whole machine.

[0044] Solution 2 is a further improvement on Solution 1, wherein the pressure roller is rotatably mounted on the outer cylinder and the rotation axis is parallel to the axis of the outer cylinder. Rotating the pressure roller on the outer cylinder facilitates the setting and helps to increase the rotation radius of the pressure roller.

[0045] Solution 3 is a further improvement on Solution 2, wherein the pressing rollers are arranged in groups, and the pressing rollers in the same group are evenly distributed on the inner surface of the outer cylinder. The even distribution of the pressing rollers on the inner surface of the outer cylinder helps the pressing rollers and the outer surface of the inner cylinder to roll the grains.

[0046] Solution 4 is a further improvement on Solution 3, wherein the plurality of pressing rollers are provided, and the projections of the pressing rollers in the axial direction of each group overlap. The use of such a design of the pressing rollers is helpful to enhance the pressing strength of the pressing rollers on the grains.

[0047] Scheme 5 is a further improvement on Scheme 4, with two pressing rollers in each group. The two pressing rollers can help improve the grain removal effect on one hand, and help prevent the re-stripping roller from being blocked on the other hand.

[0048] Scheme 6 is a further improvement on scheme 1, wherein both the inner and outer cylinders rotate around their axes and rotate relative to each other. The relative rotation of the inner and outer cylinders facilitates the rolling of the rollers.

[0049] Scheme 7 is a further improvement on Scheme 6. The inner cylinder is the active part, and the outer cylinder is driven to rotate through the planetary gear transmission mechanism. It is convenient to set up and helps to enhance the crushing strength of the grain.

[0050] Solution 8 is a further improvement on Solution 7, wherein the planetary gear transmission mechanism realizes the relative rotation of the inner cylinder and the outer cylinder at a certain transmission ratio. The planetary gear transmission mechanism has high transmission stability.

[0051] Solution 9 is a further improvement on Solution 6, wherein the discharge port is an outer cylinder sieve hole that is circumferentially distributed on the outer cylinder, and the discharge port is staggered with the pressing roller. The discharge port is a sieve hole that helps to enhance the purity of the grains.

[0052] Solution 10 is a further improvement on Solution 9, wherein the inner cylinder body is provided with inner cylinder sieve holes circumferentially corresponding to the positions where the outer cylinder body is provided with the outer cylinder sieve holes. The inner cylinder sieve holes facilitate the falling of grains.

[0053] Scheme 11 is a further improvement on Scheme 10, in which an inner agitator blade is provided at a position on the inner wall of the inner cylinder in the axial direction corresponding to the pressure roller.

[0054] Solution 12 is a further improvement on Solution 1, wherein the front end of the outer cylinder is open, and the opening constitutes the feed port, and the inner cylinder is sealed at one end facing the feed port. The feed port is located at the front end of the outer cylinder for easy feeding.

[0055] Scheme 13 is a further improvement on Scheme 12, in which the end of the inner cylinder away from the feed inlet is provided with a debris discharge plate for discharging the residual materials after re-separation.

[0056] Solution 14 is a further improvement on Solution 1, wherein the surface of the pressing roller is provided with a spiral groove for axially conveying the grain material. The spiral groove helps convey the grain material after being crushed by the pressing roller.

[0057] Scheme 15 is further improved on the basis of any one of schemes 1 to 14, wherein a cleaning device is further provided at the lower side of the discharge port, the cleaning device comprises a tubular shell, the tubular shell comprises a feed hopper for receiving the grain material flowing out of the discharge port, a grain outlet located at the lower side of the feed hopper, and a chaff outlet located at the upper side of the grain outlet, and an exhaust fan is provided in the shell between the grain outlet and the chaff outlet. The cleaning device helps to remove impurities and clean the grain after the re-threshing drum is re-threshed, thereby enhancing the purity of the grain.

[0058] Solution 16 is a further improvement on Solution 15, wherein the cylindrical shell is a Z-shaped structure, and the Z-shaped cylindrical shell includes four nodes including two end points and two bending points, and the feed hopper, grain outlet, exhaust fan and chaff outlet are sequentially arranged. The zigzag cylindrical structure helps to enhance the cleaning effect of the cleaning device.

[0059] Solution 17 is a further improvement on Solution 15, wherein the exhaust fan is a cross-flow fan. The cross-flow fan has high exhaust strength, which helps to enhance the cleaning effect of the cleaning device.

[0060] Solution 18 is a further improvement on Solution 15, wherein the feed hopper is an arc-shaped structure surrounding the outer cylinder, and the corresponding central angle of the arc-shaped feed hopper is not less than 180°. The feed hopper adopts this design to facilitate the discharge of the material from the discharge port of the outer cylinder into the feed hopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic structural diagram of a re-threshing and cleaning device in a grain harvester embodiment 1 of the present invention;

[0062] Figure 2 for Figure 1 Schematic diagram of the middle AA surface;

[0063] Figure 3 for Figure 1 Schematic diagram of the structure of the middle pressure roller;

[0064] In the attached figure: 1, conical entry section; 2, outer cylinder support bearing; 3, inner cylinder internal agitator; 4, pressure roller; 401, spiral groove; 5, inner cylinder external agitator; 6, outer cylinder; 7, outer cylinder internal agitator; 8, inner cylinder; 9, debris removal plate; 10, planetary gear transmission mechanism; 11, transmission pulley; 12, cleaning device; 13, cross-flow fan; 14, feed hopper; 15, grain outlet; 16, chaff outlet. DETAILED DESCRIPTION

[0065] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0066] A specific embodiment 1 of a combine harvester of the present invention is as follows Figures 1 to 3As shown, it includes a vehicle body, on which a re-threshing and cleaning device is installed, and the re-threshing and cleaning device includes a grain re-threshing drum and a cleaning device. The grain re-threshing drum includes an outer cylinder 6 and an inner cylinder 8 coaxially arranged with the outer cylinder 6. The front end of the outer cylinder 6 is fixed to the vehicle body through an outer cylinder support bearing 2. The outer cylinder 6 has openings at both ends, and the front end opening is a feed port for the mixed material after threshing and separation by the main cylinder to enter the grain re-threshing drum. The rear end of the cylinder is passed through by the inner cylinder and is rotatably assembled with the inner cylinder 8. In this embodiment, the inner cylinder 8 and the outer cylinder 6 are rotatably assembled through a planetary gear transmission mechanism 10. The advantage of this design is that the planetary gear transmission mechanism 10 has a compact structure and high transmission stability, which helps to achieve a reasonable configuration of the device, and the transmission ratio of the planetary gear transmission mechanism 10 meshing with the inner cylinder 8 and the outer cylinder 6 is not equal to 1. The purpose of this design is to enable the inner and outer cylinders 8 and 6 to achieve differential motion, thereby helping to increase the rolling time of the grains to be threshed, thereby improving the rolling threshing effect. In this embodiment, the driving pulley 11 on the inner cylinder 8 is driven by the driving motor through the driving belt to realize the relative rotation of the inner and outer cylinders. Of course, in other embodiments, the driving pulley 11 can also be set on the outer cylinder 6. The inner surface of the outer cylinder 6 is welded with an outer cylinder internal auger 7, and the front section of the outer cylinder is installed with a pressure roller 4. In this embodiment, there are four pressure rollers 4, two of which are located on the same circumference of the outer cylinder and are evenly arranged on the circumference. The pressure rollers 4 on the axial direction of the outer cylinder are located on the same straight line. The advantage of this design is that fewer pressure rollers 4 are used while meeting the requirement of being able to remove grains. On the one hand, the manufacturing cost of the present invention is reduced, and on the other hand, the purpose of removing grains is achieved. Of course, in other embodiments, the number of pressure rollers 4 can also be two, three, or six, and the arrangement of pressure rollers 4 can also adopt other forms. The outer surface of the pressure roller 4 in this embodiment is processed with a spiral groove 401. The purpose of setting the spiral groove 401 is to enable the spiral groove 401 to transport grains. The outer cylinder 6 is covered with sieve holes on the circumference of the rear side of the pressure roller 4. The diameter of the sieve hole is slightly larger than the grain size, so that the grain can fall through the sieve hole.

[0067] The inner cylinder 8 in this embodiment is a cylinder with closed ends. The front end of the cylinder, i.e., the end close to the feed port of the outer cylinder 6, is a conical entry section 1. The purpose of this design is to facilitate the entry of the grains to be threshed into the grain-re-threshing drum. The inner cylinder 8 corresponding to the sieve hole section on the outer cylinder 6 is provided with sieve holes. The inner and outer cylinders are provided with sieve holes that allow the grains to fall, which is conducive to the grains falling into the discharge port. At the same time, in order to prevent the grains that fall into the inner cylinder 8 from being unable to enter the discharge port, an inner cylinder internal augers 3 are welded inside the inner cylinder 8. The grains that fall into the inner cylinder can move backward through the inner cylinder internal augers 3 and fall into the outer cylinder discharge port. The rear end of the inner cylinder is equipped with a debris removal plate 9, and the grains and broken stems after threshing can be discharged through the debris removal port provided on the outer cylinder.

[0068] The cleaning device 12 in this embodiment includes a tubular shell, which is a zigzag structure. The two ends of the zigzag tubular shell and the turning points of the two bends are sequentially provided with a feed hopper 14, a grain outlet 15, a cross-flow fan 13 and a husk outlet 16. The feed hopper 14 and the grain outlet 15 have a certain slope. The purpose of such design is to allow the grain discharged from the discharge port of the outer cylinder 6 to easily enter the inside of the cleaning device 12. The grain outlet 15 is located at the lower part of the cleaning device 12, and the grains can slide down by gravity. The cross-flow fan 13 in this embodiment is located obliquely above the grain outlet 15, and the husk outlet 16 is located obliquely below the cross-flow fan 13. Such a design helps the cross-flow fan 13 to extract the husk mixed in the grains and discharge it smoothly.

[0069] When the combine harvester of the present invention is used, the mixed materials (grains, grains, chaff, and broken stems) separated by the concave plate of the threshing device are grasped and pushed and fed by the auger blades welded on the conical entry section 1. First, the re-threshing operation of the grains on the grains is completed through the cooperation of the pressure roller 4 and the front cylinder of the inner cylinder 8. The mixed materials after re-threshing are transported to the rear section under the joint pushing action of the auger 5 blades outside the inner cylinder and the spiral groove 401 on the pressure roller 4. Then, under the transportation of the auger 7 blades inside the outer cylinder, the fine grains and chaff enter the cleaning device through the discharge port on the outer cylinder. The grains, chaff, and broken stems are discharged from the machine through the impurity discharge port through the impurity discharge plate 9. The auger 3 blades inside the inner cylinder also ensure that the grains and chaff that fall into the inner cylinder move to the rear section of the device. As grains and chaff fall through the cleaning device, their aerodynamic characteristics are different in the airflow. By controlling the speed of the cross-flow fan, the lighter chaff can be sucked out by the cross-flow fan and discharged through the chaff outlet, while the heavier grains fall into the granary from the grain outlet due to gravity.

[0070] The specific embodiment 2 of the combine harvester of the present invention is different from the embodiment 1 in that the pressure roller in this embodiment is installed on the inner cylinder body, and the rest is the same as the embodiment 1 and will not be repeated.

[0071] The specific embodiment 3 of the combine harvester of the present invention is different from the embodiment 1 in that the outer cylinder and the inner cylinder are rotatably assembled, the inner cylinder is fixed on the vehicle body, the outer cylinder rotates around the inner cylinder to crush the grains to be threshed, and the threshed grains are transported backwards along the augers on the inner and outer cylinders. The rest is the same as the embodiment 1 and will not be described in detail.

[0072] The specific embodiment 4 of the combine harvester of the present invention is different from the embodiment 1 in that the inner cylinder of the present embodiment is not provided with sieve holes, and of course, the inner wall of the inner cylinder is not provided with a auger. The rest is the same as the embodiment 1 and will not be described again.

[0073] The embodiments of the re-threshing and cleaning device of the present invention are the same as the embodiments of the re-threshing and cleaning device in the above-mentioned combine harvester embodiments, and will not be described in detail.

[0074] The embodiment of the grain re-thresher drum of the present invention is the same as the embodiment of the grain re-thresher drum in each embodiment of the above-mentioned combine harvester, and will not be described in detail.

Claims

1. A grain re-stripping drum, characterized in that: It includes an outer cylinder, both ends of which are respectively provided with a feed port and a discharge port, the outer cylinder is open at both ends, and the front end opening is a feed port for the mixed material after threshing and separation by the main drum to enter the grain re-threshing drum, an inner cylinder is coaxially arranged inside the outer cylinder, the inner cylinder is sealed at one end facing the feed port, the front end of the inner cylinder, i.e., the end close to the feed port of the outer cylinder, is a tapered entry section, the outer cylinder is rotatably assembled with the inner cylinder, the inner and outer cylinders both rotate around their axes, and the two rotate relative to each other, the inner cylinder is an active part, and the outer cylinder is driven to rotate by a planetary gear transmission mechanism, and the planetary gear The transmission mechanism realizes the relative rotation of the inner cylinder and the outer cylinder at a certain transmission ratio. An agitator blade for conveying grain is provided on the inner surface of the outer cylinder or at least one of the outer surfaces of the inner cylinder. A feeding channel is formed between the inner and outer cylinders. A pressure roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush the grain passing through. A spiral groove is processed on the outer surface of the pressure roller. The outer cylinder is covered with sieve holes on a part of the circumference of the rear side of the pressure roller. Inner cylinder sieve holes are circumferentially arranged on the inner cylinder corresponding to the positions where the outer cylinder sieve holes are arranged on the outer cylinder, and an inner cylinder internal agitator is welded inside the inner cylinder.

2. The grain re-stripping drum according to claim 1, characterized in that: The pressing roller is rotatably mounted on the outer cylinder and its rotation axis is parallel to the axis of the outer cylinder.

3. The grain re-stripping drum according to claim 2, characterized in that: The pressing rollers are arranged in groups, and the pressing rollers in the same group are evenly distributed on the inner surface of the outer cylinder.

4. The grain re-stripping drum according to claim 3, characterized in that: There are more than two groups of pressing rollers, and the projections of the pressing rollers of each group in the axial direction overlap.

5. The grain re-stripping drum according to claim 4, characterized in that: Each group has two rollers.

6. The grain re-stripping drum according to any one of claims 1 to 5, characterized in that: The material discharging port is an outer cylinder sieve hole which is circumferentially distributed on the outer cylinder body, and the material discharging port is staggered with the pressing roller.

7. The grain re-stripping drum according to claim 1, characterized in that: An inner auger blade is arranged at a position on the inner wall of the inner cylinder in the axial direction corresponding to the pressure roller.

8. The grain re-stripping drum according to any one of claims 1 to 5, characterized in that: The end of the inner cylinder away from the feed port is provided with a debris discharge plate for discharging the residual after the re-separation.

9. A re-throwing and cleaning device, comprising a grain re-throwing drum, characterized in that: The grain-removing drum comprises an outer drum, and a feed port and a discharge port are respectively arranged at two ends of the outer drum. The outer drum is open at both ends, and the front end opening is a feed port for the mixed material after threshing and separation by the main drum to enter the grain-removing drum. An inner drum is coaxially arranged inside the outer drum, and the inner drum is sealed at one end facing the feed port. The front end of the inner drum, i.e., the end close to the feed port of the outer drum, is a conical entry section. The outer drum is rotatably assembled with the inner drum, and the inner and outer drums both rotate around their axes and rotate relative to each other. The inner drum is an active component, and drives the outer drum to rotate through a planetary gear transmission mechanism. The planetary gear transmission mechanism realizes the relative rotation of the inner cylinder and the outer cylinder at a certain transmission ratio. An agitator blade for conveying grain is provided on at least one of the inner surface of the outer cylinder or the outer surface of the inner cylinder. A feeding channel is formed between the inner and outer cylinders. A pressure roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush the grain passing through. A spiral groove is processed on the outer surface of the pressure roller. The outer cylinder is covered with sieve holes on a part of the circumference of the rear side of the pressure roller. Inner cylinder sieve holes are circumferentially arranged on the inner cylinder corresponding to the position where the outer cylinder sieve holes are arranged on the outer cylinder, and an inner cylinder internal agitator is welded inside the inner cylinder.

10. The re-separation and cleaning device according to claim 9, characterized in that: The pressing roller is rotatably mounted on the outer cylinder and its rotation axis is parallel to the axis of the outer cylinder.

11. The re-separation and cleaning device according to claim 10, characterized in that: The pressing rollers are arranged in groups, and the pressing rollers in the same group are evenly distributed on the inner surface of the outer cylinder.

12. The re-separation and cleaning device according to claim 11, characterized in that: There are more than two groups of pressing rollers, and the projections of the pressing rollers of each group in the axial direction overlap.

13. The re-separation and cleaning device according to claim 12, characterized in that: Each group has two rollers.

14. The re-separation and cleaning device according to claim 9, characterized in that: The material discharging port is an outer cylinder sieve hole which is circumferentially distributed on the outer cylinder body, and the material discharging port is staggered with the pressing roller.

15. The re-separation and cleaning device according to claim 9, characterized in that: An inner auger blade is arranged at a position on the inner wall of the inner cylinder in the axial direction corresponding to the pressure roller.

16. The re-separation and cleaning device according to claim 9, characterized in that: The end of the inner cylinder away from the feed port is provided with a debris discharge plate for discharging the residual after the re-separation.

17. The re-separation and cleaning device according to any one of claims 9 to 16, characterized in that: A cleaning device is also provided at the lower side of the discharge port, and the cleaning device includes a tubular shell, which includes a feed hopper for receiving the grain material flowing out of the discharge port, a grain outlet located at the lower side of the feed hopper, and a chaff outlet located at the upper side of the grain outlet, and an exhaust fan is provided in the shell between the grain outlet and the chaff outlet.

18. The re-separation and cleaning device according to claim 17, characterized in that: The cylindrical shell is a Z-shaped structure, and the Z-shaped cylindrical shell includes four nodes including two end points and two bending points, and the feed hopper, grain outlet, exhaust fan and chaff outlet are arranged in sequence.

19. The re-separation and cleaning device according to claim 17, characterized in that: The exhaust fan is a cross-flow fan.

20. The re-separation and cleaning device according to claim 17, characterized in that: The feed hopper is an arc-shaped structure surrounding the outer cylinder, and the corresponding central angle of the arc-shaped feed hopper is not less than 180°.

21. A combine harvester, comprising a vehicle body, on which a re-threshing and cleaning device is installed, characterized in that: The re-threshing and sorting device comprises a grain re-threshing drum, and the grain re-threshing drum comprises an outer cylinder, and both ends of the outer cylinder are respectively provided with a feed port and a discharge port, and both ends of the outer cylinder are open, and the front end opening is a feed port for the mixed material after threshing and separation by the main cylinder to enter the inside of the grain re-threshing drum, and an inner cylinder is coaxially arranged inside the outer cylinder, and the inner cylinder is sealed at one end facing the feed port, and the front end of the inner cylinder, i.e., the end close to the feed port of the outer cylinder, is a conical entry section, and the outer cylinder is rotatably assembled with the inner cylinder, and the inner and outer cylinders both rotate around their axes and rotate relative to each other, and the inner cylinder is an active part, which is driven by a planetary gear transmission mechanism. The outer cylinder is driven to rotate, and the planetary gear transmission mechanism realizes the relative rotation of the inner cylinder and the outer cylinder at a certain transmission ratio. An agitator blade for conveying grain is provided on at least one of the inner surface of the outer cylinder or the outer surface of the inner cylinder, and a feeding channel is formed between the inner and outer cylinders. A pressure roller is provided between the inner and outer cylinders for cooperating with the inner surface of the outer cylinder and / or the outer surface of the inner cylinder to crush the passing grain. A spiral groove is processed on the outer surface of the pressure roller. The outer cylinder is covered with sieve holes on the circumference of a part of the rear side of the pressure roller. Inner cylinder sieve holes are circumferentially arranged on the inner cylinder corresponding to the position where the outer cylinder sieve holes are arranged on the outer cylinder, and an inner cylinder internal agitator is welded inside the inner cylinder.

22. The combine harvester according to claim 21, characterized in that: The pressing roller is rotatably mounted on the outer cylinder and its rotation axis is parallel to the axis of the outer cylinder.

23. The combine harvester according to claim 22, characterized in that: The pressing rollers are arranged in groups, and the pressing rollers in the same group are evenly distributed on the inner surface of the outer cylinder.

24. The combine harvester according to claim 23, characterized in that: There are more than two groups of pressing rollers, and the projections of the pressing rollers of each group in the axial direction overlap.

25. The combine harvester according to claim 24, characterized in that: Each group has two rollers.

26. The combine harvester according to claim 21, characterized in that: The material discharging port is an outer cylinder sieve hole which is circumferentially distributed on the outer cylinder body, and the material discharging port is staggered with the pressing roller.

27. The combine harvester according to claim 21, characterized in that: An inner auger blade is arranged at a position on the inner wall of the inner cylinder in the axial direction corresponding to the pressure roller.

28. The combine harvester according to claim 21, characterized in that: The end of the inner cylinder away from the feed port is provided with a debris discharge plate for discharging the residual after the re-separation.

29. The combine harvester according to any one of claims 21 to 28, characterized in that: A cleaning device is also provided at the lower side of the discharge port, and the cleaning device includes a tubular shell, which includes a feed hopper for receiving the grain material flowing out of the discharge port, a grain outlet located at the lower side of the feed hopper, and a chaff outlet located at the upper side of the grain outlet, and an exhaust fan is provided in the shell between the grain outlet and the chaff outlet.

30. The combine harvester according to claim 29, characterized in that: The cylindrical shell is a Z-shaped structure, and the Z-shaped cylindrical shell includes four nodes including two end points and two bending points, and the feed hopper, grain outlet, exhaust fan and chaff outlet are arranged in sequence.

31. The combine harvester according to claim 29, characterized in that: The exhaust fan is a cross-flow fan.

32. The combine harvester according to claim 29, characterized in that: The feed hopper is an arc-shaped structure surrounding the outer cylinder, and the corresponding central angle of the arc-shaped feed hopper is not less than 180°.

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