CN107396700B - Threshing device of millet combine harvester - Google Patents
Threshing device of millet combine harvester Download PDFInfo
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- CN107396700B CN107396700B CN201710706657.3A CN201710706657A CN107396700B CN 107396700 B CN107396700 B CN 107396700B CN 201710706657 A CN201710706657 A CN 201710706657A CN 107396700 B CN107396700 B CN 107396700B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/18—Threshing devices
- A01F12/22—Threshing cylinders with teeth
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Abstract
A threshing device of a millet combine harvester belongs to the technical field of crop harvesting. The invention relates to a grain threshing device, which comprises a threshing cylinder, a threshing cylinder top cover and a grid concave plate, wherein the threshing cylinder top cover is arranged above the threshing cylinder; the open type rear barrel comprises a roller shaft coaxially connected with the closed type conical front barrel, a breadth disc connected with two ends of the roller shaft, and a plurality of threshing toothed bars which are circumferentially and uniformly distributed on the roller shaft and connected on the breadth disc; part of the threshing toothed bars are provided with a toothed bar with a rasp bar and a plurality of grass discharging teeth, and part of the threshing toothed bars are provided with a combined toothed bar and a plurality of grass discharging teeth; the combined toothed bar is formed by alternately arranging a plurality of threshing teeth and a plurality of arc-shaped elastic teeth. The threshing device of the millet combine harvester is simple in structure, mainly uses kneading and rolling, has a certain function of dredging and brushing, and effectively reduces the amount of paste and sieve with green stalks and leaves.
Description
Technical Field
The invention relates to the technical field of crop harvesting, in particular to a threshing device of a millet combine harvester.
Background
In recent years, with the popularization of domestic high-quality hybrid millet and the great increase of the coarse cereal consumption demand in the market, the millet production is emphasized and expanded, and the production income and planting enthusiasm of farmers are also greatly improved. However, the current "bottleneck" that affects millet production the most is the harvest.
The millet belongs to the microculture, and the straw is green ripe, and the millet ear hangs down, and the seed grain is little, a grain is light, and the millet sign indicating number and stem stalk separation difficulty during the results, and the seed grain is difficult for coming off completely, smugglies with the cleaning loss rate height, and the serious scheduling problem of damage is outstanding.
At present, three types of machines for millet harvesting are available, one is a crawler machine adopting a single-longitudinal-shaft tooth-bar roller for grain shedding, the other is a crawler machine adopting a double-transverse-shaft threaded-bar roller for grain shedding, and the other is a wheel machine adopting a single-transverse-cutting threaded-bar roller for threshing. The former adopts a single longitudinal axial flow toothed bar roller, has strong threshing capacity and long threshing time, can harvest rice, wheat and rape, and also can harvest grain crops such as soybean, coix seed, millet and the like by means of properly changing parameters of the roller or a concave plate and the like according to the types of harvested crops, has very strong adaptability, and belongs to a 'universal' threshing system. But the defects are that the beating force is large and the kneading force is small in the threshing process, and the strong beating force not only makes the crushing rate difficult to control, but also easily generates a large amount of crushed straws to increase the load brought to the next cleaning. Secondly, the double-transverse-axis threaded rod roller is adopted, and the two full-length threaded rod rollers are adopted, so that the strong kneading rate and the long-time spiral motion type threshing damage the shell of the millet and the breakage rate index is easy to exceed the standard, and the structure is also not suitable for harvesting rice. In the latter, although the threshing of the whole grain stems with strong rubbing force is also adopted, the single cross-flow mode has short threshing time for the crops, the threshed stems are complete, the scion breaking rate is low, and the subsequent treatment is facilitated. But the disadvantages are that the threshing machine is not suitable for harvesting crops which are difficult to thresh, such as rice and the like, because the impact capacity is relatively weak, the threshing time is short, the threshing rate is general, when the feeding is uneven and the humidity of grains is high, the threshing quality is obviously reduced, the adaptability is low, and the multipurpose of one machine is not facilitated. Therefore, the machine is only applied to a wheeled machine which mainly harvests wheat and soybeans and has a working width less than 4 meters at present, and the machine which has higher requirement on loss rate or harvests difficultly-detached crops is gradually replaced by a double or three transverse-flow roller and a single longitudinal-axis flow line rod roller. The large-scale machine with the working width of 6 meters and more in Europe and America adopts a double-longitudinal-shaft flow line rod roller.
The patent ZL2015105537826 of the applicant discloses a millet combine harvester and a threshing and cleaning device and a threshing and cleaning system thereof, and particularly discloses that the threshing and cleaning device comprises a threshing separation part, wherein the threshing separation part comprises a threshing box body, a front threshing roller, a rear threshing roller, a front separation sieve, a rear separation sieve, a transition separation sieve, a front threshing top cover, a rear threshing top cover and a transmission mechanism for providing power for the front threshing roller and the rear threshing roller. The front threshing cylinder and the rear threshing cylinder are horizontally arranged in the threshing box body, and are separated from each other, and an intersection E is arranged between the front threshing cylinder and the rear threshing cylinder; the front separation sieve is positioned right below the front threshing roller and is wrapped outside the front threshing roller; the rear separating screen is positioned under the rear threshing roller and is half-wrapped at the front section of the rear threshing roller close to the front threshing roller; the front side of the transition separating screen is butted with the rear side of the front separating screen, and the rear side of the transition separating screen is butted with a feeding port F of the rear separating screen; the front threshing top cover is arranged on the front threshing roller, and the rear threshing top cover is arranged on the rear threshing roller.
The threshing and separating part in the threshing and cleaning device adopts two sets of threshing systems with different structures, lengths and parameters in parallel, the front threshing system adopts a half tangential flow half axial flow threshing principle, and the grain size is mainly kneaded and crushed; the post-threshing system adopts a full axial flow threshing principle, and when the grain is further kneaded, the residual grain which is not completely threshed is beaten so as to completely separate the grains from the grain. However, when the green stalks and leaves are actually kneaded and rolled, the green stalks and leaves are wetted and easily pasted on the concave plate, so that the seeds are not easy to completely fall off. Because the kneading time in a single threshing cylinder is insufficient, even if the kneading action of two threshing cylinders is combined, the problem of screen pasting cannot be effectively solved because the threshing principles of the threshing cylinders are different.
In addition, the concave plate of the existing transverse axial flow combine adopts an integral concave plate structure of 220-270 degrees, and the concave plate applied in the prior art adopts the integral concave plate structure, wherein the radian of the concave plate formed by the front sieve bar and the front steel wire is 270 degrees, and the radian of the concave plate formed by the rear sieve bar and the rear steel wire is different in the front section and the rear section so as to adapt to different threshing principles of front and rear threshing systems. However, the roller must be disassembled during the disassembly and assembly of the integral concave plate structure, the disassembly and assembly are inconvenient, the concave plate structure is worn in different positions to different degrees along with the longer service life, the whole concave plate needs to be replaced, and the maintenance cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the threshing device of the millet combine harvester, which has the advantages of long threshing time, large separation area, reduction of pasting sieve with green stalks and leaves, convenience in disassembly and assembly and low maintenance cost.
The invention is realized by the following technical scheme:
a threshing device of a millet combine harvester comprises a threshing cylinder, a threshing cylinder top cover arranged above the threshing cylinder and a grid concave plate arranged below the threshing cylinder, wherein the threshing cylinder comprises a closed conical front cylinder and an open rear cylinder; the open type rear barrel comprises a drum shaft coaxially connected with the closed type conical front barrel, a breadth plate connected with two ends of the drum shaft, and a plurality of threshing toothed bars which are uniformly distributed on the drum shaft in the circumferential direction and connected to the breadth plate; part of the threshing toothed bars are provided with a toothed bar with a rasp bar and a plurality of grass discharging teeth, and part of the threshing toothed bars are provided with a combined toothed bar and a plurality of grass discharging teeth; the combined toothed bar is formed by a plurality of threshing teeth and a plurality of arc elastic teeth which are alternately arranged at intervals.
The threshing device of the millet combine harvester adopts the threshing toothed bar with the grain bar toothed bar and the combined toothed bar to realize threshing, so that the threshing device not only keeps strong kneading and grinding capacity on grains, but also has the capacity of dredging and brushing stalks and leaves pasted on the threshing device, improves the grain threshing rate, and reduces the entrainment loss rate. Meanwhile, through further sieving of the grid concave plate with the small mesh structure, the downward leakage of empty and crushed grain codes is prevented, and the next cleaning difficulty of the millet combine harvester is reduced.
Preferably, the tooth tips of the rasp bar teeth on the rasp bar tooth bar are positioned at the same height with the tooth tips of the grass discharge teeth on the threshing tooth bar provided with the rasp bar teeth; the tooth tips of the threshing teeth and the tooth tips of the line rod teeth are positioned at the same height, and are also positioned at the same height as the tooth tips of the grass discharge teeth on the threshing tooth rod provided with the threshing teeth; the height of the highest point of the arc-shaped spring tooth is higher than that of the tooth point of the threshing tooth.
Preferably, the grain pole teeth or the grass discharge teeth on the threshing tooth pole provided with the threshing teeth or the clearance between the threshing teeth and the concave plate is not more than 10 mm.
Preferably, a gap between the arc-shaped spring tooth and the concave plate is not less than 2 mm and not more than 5 mm.
Preferably, the height difference between the highest point of the arc-shaped spring tooth and the tooth tip of the threshing tooth is not less than 5 mm and not more than 7 mm.
Preferably, the concave plate is a 180-degree symmetrical tile segmented grid concave plate.
Preferably, the hole pitches between grids on the concave plate are all equal.
Preferably, the pitch is not less than 6 mm and not more than 8 mm.
Preferably, the concave plate comprises screen bars arranged along the radian direction of the concave plate and cross bars arranged along the length direction of the concave plate; the distance d of the transverse strips higher than the screen bars is not less than 6 mm and not more than 7 mm.
Preferably, the threshing toothed bars are 6, wherein 4 threshing toothed bars are provided with one rasp toothed bar and a plurality of grass discharging teeth on each threshing toothed bar, and 2 threshing toothed bars are provided with one combined toothed bar and a plurality of grass discharging teeth on each threshing toothed bar.
Preferably, the arc-shaped convex part on the arc-shaped spring tooth is oriented to be consistent with the rotating direction of the threshing cylinder.
Preferably, the length of the toothed bar is at least two thirds of the length of the threshing toothed bar.
Preferably, the threshing teeth and the grass discharge teeth are finger-shaped teeth.
Preferably, the diameter of the threshing cylinder is not less than 600mm and not more than 640 mm.
The invention has the following beneficial effects:
the threshing device of the millet combine harvester is simple in structure, convenient to disassemble and assemble, capable of fully rubbing, not prone to pasting a sieve and capable of preventing whole grain yards and more than one half of crushed grain yards from falling into a cleaning part of the combine harvester.
Drawings
FIG. 1 is an axial cross-sectional view of a threshing apparatus of a combine harvester for millet according to the present invention;
FIG. 2 is a perspective view of a threshing cylinder in the threshing device of the combine harvester for cereals according to the invention;
FIG. 3a is an enlarged view of A in FIG. 2;
FIG. 3B is an enlarged view of B in FIG. 2;
FIG. 4 is an exploded view of the concave plate of the threshing device of the combine harvester for millet of the present invention;
FIG. 5 is a schematic diagram of the hole pitch between concave plates of the threshing device of the combine harvester for millet according to the present invention;
FIG. 6 is a schematic diagram showing the distance between the inner cambered surface of the inner concave plate and the threshing tooth top of the threshing device of the combine harvester for millet of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Because the millet belongs to the small crop, compared with wheat, rice and corn, the grain quality is small, the thousand grain weight is only 2.4-3.5g, the strip main stem is arranged in the middle of the millet spike, a primary branch is generated on the grain head, a secondary branch and a tertiary branch are generated on the primary branch, each branch is a small size, a plurality of grains are arranged on the primary branch, and the number of grains is up to two or three hundred grains. In addition, the summer millet has the characteristics of green and mature straws and large moisture when being mature, and in the threshing process, the stalks, the leaves, the broken grains and the seeds are stuck together and are difficult to separate. If the concave plate structure and the distance between the concave plate structure and the tooth tips are not properly designed, the threshing rate is reduced, and a large amount of crushed grain codes are generated to enter a cleaning system to increase the cleaning difficulty. In addition, like rice, millet has a layer of shell on the outer layer, if strong threshing is adopted, the millet is easy to break into millet by impact in the threshing process, and the high breakage rate, namely the easy damage of grains, is also a very difficult matter to handle. Not only is it easy to mildew during storage, but also when it is used for seed harvesting, the rate of emergence and germination are greatly affected.
The prior patent ZL2015105537826 'a combine harvester for millet and a threshing and cleaning device and a threshing and cleaning system thereof' cannot overcome the problems. The invention adopts a half-tangential flow half-axial flow front threshing cylinder and a full-axial flow rear threshing cylinder, can knead grains to a certain extent, but cannot avoid screen pasting. In addition, the prior invention patent adopts a threshing part consisting of two threshing cylinders which are not all axial flow, and the hitting force of the threshing part is weaker than that of a millet harvesting threshing cylinder for single longitudinal axial flow; the effective threshing stroke of the two threshing cylinders is not long enough. The concave plates of the prior invention are all integrated and are not easy to disassemble and assemble.
Therefore, the invention provides a threshing device of a combine harvester for millet, which comprises a threshing cylinder 100, a threshing cylinder top cover (not shown) arranged above the threshing cylinder 100 and a grid concave plate 5 arranged below the threshing cylinder 100, as shown in figure 1. The threshing cylinder 100 comprises a closed conical front cylinder 10 and an open rear cylinder 20. The roller is used as a large-diameter super-long roller for single-longitudinal-axis flow threshing, the diameter of the roller is not less than 600mm and not more than 650 mm, and the size of the roller is phi 600mm multiplied by 2000 mm-phi 650 mm multiplied by 2000mm. The diameter of the front threshing cylinder and the rear threshing cylinder of the prior invention patent is 540 mm, the size of the front threshing cylinder is phi 540 x 600mm, and the size of the rear threshing cylinder is phi 540 x 1200mm. Therefore, the threshing device greatly prolongs the threshing time, increases the separation area, overcomes the problem of small rubbing force of the single-longitudinal-axis flow rack rod roller, adopts the advantage of large hitting force of the single-longitudinal-axis flow rack rod roller, is superior to the prior invention in threshing timeliness and area, and further improves the threshing efficiency of the millet.
The top cover of the threshing cylinder is internally provided with a grass guiding rib. After entering the roller, crops are guided by the grass guiding ribs on the top cover to do spiral motion backwards, the tail end of the roller is also a grass discharging end and extends to the tail end of the millet harvester, and the grass discharging is in a natural falling mode.
Fig. 2 shows a block diagram of a threshing cylinder.
The closed conical front barrel 10 is arranged at the front end of the millet harvesting threshing cylinder and is provided with a closed conical barrel with 2 or 3 helical blades.
The open type rear barrel 20 comprises a drum shaft 201, a breadth disc 202 and a plurality of threshing toothed bars. The roller shaft is coaxially connected with the closed type conical front barrel 10, and when the millet harvesting threshing roller rotates, the closed type conical front barrel 10 and the open type rear barrel 20 coaxially rotate. The open rear barrel 20 is a cylindrical open barrel, it can be seen from fig. 2 that the barrel shaft 201 is arranged on the open rear barrel 20 in a left-right direction, the breadth plate 202 is connected to two sides of the barrel shaft 201 in a key manner, and a plurality of threshing tooth bar shafts are uniformly distributed in the circumferential direction of the barrel shaft 201 and connected to the breadth plate 202.
A plurality of ratchets have the threshing teeth pole of two kinds of isostructures, wherein partly thresh and be equipped with a rasp pole ratchets 1 and a plurality of row grass tooth 4 on each ratchets of ratchets pole, rasp pole ratchets 1 through the bolt fastening in the anterior segment of threshing teeth pole rubs and grinds the pressure degree for the improvement, makes the millet sign indicating number rub from main stem stalk and take off and make seed grain separate out from the millet sign indicating number gradually, the length of rasp pole ratchets 1 does at least threshing teeth pole length's two-thirds. The rear section of the threshing rack gear where the rasp bar rack gear is a grass discharge section, a plurality of grass discharge teeth 4 are arranged on the grass discharge section, and the grass discharge teeth 4 are arranged on the threshing rack gear at equal intervals and fixed in a welding mode. Wherein, the threshing toothed bar body provided with the threaded bar toothed bar 1 consists of a toothed bar, a toothed bar connecting plate and a support seat, wherein the two sides of the toothed bar are protruded downwards, and the support seat is protruded upwards.
Wherein each toothed bar of the partial threshing toothed bars is provided with a combined toothed bar and a plurality of grass discharging teeth 4. The combined toothed bar is formed by a plurality of threshing teeth 3 and a plurality of arc-shaped elastic teeth 2 which are alternately arranged at intervals. The threshing teeth 3 and the arc elastic teeth 2 of the combined toothed bar are combined and welded at the front section of the threshing toothed bar, and in order to remove paste while beating, the arc elastic teeth 2 are 5 to 7mm higher than the threshing teeth, so that a small gap between the arc elastic teeth 2 and the concave plate can more easily brush short stalks and crushed leaves pasted on the inner surface of the concave plate cleanly. The rear section of the threshing rack bar where the combined rack bar is located is a grass discharge section, a plurality of grass discharge teeth 4 are arranged on the grass discharge section, and the grass discharge teeth 4 are arranged on the threshing rack bar at equal intervals and fixed in a welding mode. Wherein, the threshing toothed bar body provided with the combined toothed bar consists of the toothed bar, a toothed bar connecting plate and a support seat, wherein the two sides of the toothed bar are protruded downwards, and the support seat is protruded upwards.
In order to reduce the damage to the millet and considering that the millet planting area is basically free of rice, the threshing toothed bars preferably have 6 threshing toothed bars, wherein 4 threshing toothed bars are provided with one rasp toothed bar and a plurality of grass discharging teeth, and 2 threshing toothed bars are provided with one combined toothed bar and a plurality of grass discharging teeth. Wherein, 2 threshing rack bars with combined rack bars are arranged symmetrically, and 4 threshing rack bars with rasp rack bars are also arranged symmetrically, so as to eliminate the unbalance caused by the high-speed running of the threshing cylinder and ensure that the threshing is more uniform and effective.
The threshing cylinder of the invention adopts a rasp-bar toothed bar in the threshing section to mainly knead and roll, knead and strip grains from main stems and leaves and gradually separate grains from the grains, and adopts a combined toothed bar to strike and brush the short stems and the broken leaves stuck on the inner surface of a concave plate by using the elastic teeth of arc-shaped steel wires. Specifically, the tooth tips of the rasp bar teeth on the rasp bar toothed bar 1 and the tooth tips of the grass discharge teeth 4 on the threshing toothed bar provided with the rasp bar teeth are positioned at the same height; the tooth tips of the threshing teeth 3 are positioned at the same height as the tooth tips of the ripple rod teeth and are also positioned at the same height as the tooth tips of the grass discharge teeth 4 on the threshing tooth rod provided with the threshing teeth 3; the height of the highest point of the arc-shaped spring tooth 2 is higher than that of the tooth tip of the threshing tooth 3. Thus, the arc spring tooth 2 extends outwards from the joint with the threshing toothed bar, the extending free end of the arc spring tooth is in a curved shape, and the arc spring tooth is similar to a broom to clean the green stalks and leaves stuck on the inner surface of the concave plate. As shown in fig. 3a and 3b, the height of the highest point of the arc-shaped spring tooth 2 and the height of the tooth tip of the threshing tooth 3 are different from each other by not less than 5 mm and not more than 7mm, so that paste siftings can be effectively swept. Wherein, in order to prevent the roller from being blocked, the arc-shaped convex part on the arc-shaped spring tooth 2 faces to the same direction as the rotation direction of the threshing roller. The threshing teeth 3 are finger-shaped teeth and are used for kneading and beating grain codes.
The threshing cylinder of the invention is provided with grass discharge teeth at the grass discharge section, namely the tail end of each threshing toothed bar. The width of the grass discharge teeth is equal to that of the grass discharge opening of the millet threshing part. The grass discharge teeth are finger-shaped teeth, so that the threshed long stalks and empty grains are quickly discharged out of the machine while residual grains which are not threshed although being kneaded and beaten for a long time are beaten and semi-mature or immature residual grains are thoroughly separated.
A grid concave plate 5 is arranged below the millet harvesting threshing cylinder, the grid concave plate 5 adopts three sections of six tile-shaped grid sieves with wrap angles of 180 degrees (refer to the attached figure 4), and the symmetrical grid sieves are fixed through positioning pins 51 and positioning holes 52, so that the concave plate can be disassembled and assembled without disassembling the cylinder. Grid notch board 5 all adopts close clearance, particularly, the pitch-row equals between the grid on the notch board, leaks down from the sieve mesh for the millet sign indicating number and half millet sign indicating number that prevent to thresh the in-process and take off, and pitch-row d is for being not less than 6 millimeters and being not more than 8 millimeters, only need trade one of them when the serious condition of wearing and tearing appears in certain part of notch board like this, also can be with the less great piece of replacement wearing and tearing of wearing and tearing on the notch board, greatly reduced maintenance cost, improved the dismouting convenience.
The recess includes screen bars 54 arranged along the curvature of the recess and cross bars 53 arranged along the length of the recess. In order to prevent the concave 5 from being stuck during threshing, the distance b between the transverse bar 53 and the sieve bar 54 is set to be not less than 6 mm and not more than 7 mm.
In order to avoid the paste from being screened on the concave 5, the clearance between the threshing toothed bar and the concave, especially the distance between the tooth tip of the threshing toothed bar and the inner arc surface of the concave is limited in a certain range. Specifically, the grain pole teeth or the grass discharge teeth 4 on the threshing tooth pole provided with the threshing teeth 3 or the clearance a between the threshing teeth 3 and the concave plate 5 is not more than 10 mm. Further, the clearance between the arc spring tooth and the concave plate is not less than 2 mm and not more than 5 mm.
When the plant is conveyed to a threshing roller, the grain rod on the roller is kneaded and rolled, most part of grain codes on the grain ears are rubbed off, the mixture with the grain codes, the grain ears and the stalks is clamped to make backward spiral motion and enter the middle section of the roller, under the continuous kneading action of the grain rod on the roller, the grain codes on the grain ears are completely fallen off, more than 95 percent of grains are also separated from the grain codes, and when the plant continuously moves backward and reaches the tail section of the roller, the residual grain codes which are not completely fallen off are continuously beaten by finger-shaped teeth at the rear end of the toothed bar and completely fall off. In the whole threshing process, the long stalks, the large miscellaneous leaves, the grain-free grain yards and part of the crushed grain yards can be thrown and fall to the ground from the outlet end of the roller, and the grains and the grain-free crushed grain yards can fall from the grid gaps of the concave plate and enter the grain cleaning part for subsequent cleaning.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a millet combine thresher, includes threshing cylinder, locates the threshing cylinder top cap of threshing cylinder top, locates the grid notch board of threshing cylinder below, its characterized in that: the threshing cylinder comprises a closed conical front cylinder and an open rear cylinder, the open rear cylinder comprises a cylinder shaft coaxially connected with the closed conical front cylinder, a breadth plate connected to two ends of the cylinder shaft, and a plurality of threshing toothed bars which are uniformly distributed on the cylinder shaft in the circumferential direction and connected to the breadth plate; each threshing toothed bar of a part of the threshing toothed bars is provided with a threaded bar toothed bar and a plurality of grass discharging teeth, each threshing toothed bar of the rest part of the threshing toothed bars is provided with a combined toothed bar and a plurality of grass discharging teeth, and the combined toothed bar is formed by alternately arranging a plurality of threshing teeth and a plurality of arc-shaped elastic teeth; the tooth point of the line rod teeth on the line rod tooth rod, the tooth point of the threshing teeth and the tooth point of the grass discharge teeth are the same with the gap between the concave plates, the gap is not more than 10 mm, the gap between the free end of the arc elastic teeth and the concave plates is not less than 2 mm and not more than 5 mm, and the difference between the tooth point and the gap between the concave plates and the difference between the free end of the arc elastic teeth and the gap between the concave plates are not less than 5 mm and not more than 7 mm.
2. The threshing apparatus of a combine harvester as defined in claim 1, wherein: the concave plate is a 180-degree symmetrical tile sectional type grid concave plate.
3. The threshing apparatus of a combine harvester as defined in claim 2, wherein: the hole distances among the grids on the concave plate are equal.
4. The threshing apparatus of a combine harvester according to claim 3, wherein: the pitch is not less than 6 mm and not more than 8 mm.
5. A threshing mechanism of a combine harvester as defined in any one of claims 1 to 4, wherein: the concave plate comprises sieve bars arranged along the radian direction of the concave plate and cross bars arranged along the length direction of the concave plate, and the distance d of each cross bar, which is higher than the sieve bars, is not less than 6 millimeters and not more than 7 millimeters.
6. The threshing device of the combine harvester as defined in claim 1, wherein: threshing rack has 6, wherein every threshing rack in 4 threshing rack is equipped with a rasp bar rack and a plurality of row grass tooth, every threshing rack in 2 threshing rack is equipped with a combination rack and a plurality of row grass tooth in addition.
7. The threshing apparatus of a combine harvester as defined in claim 1, wherein: the arc-shaped convex part on the arc-shaped elastic tooth faces to the direction consistent with the rotation direction of the threshing cylinder.
8. The threshing apparatus of a combine harvester as defined in claim 1, wherein: the length of the gear rod tooth rod is at least two thirds of that of the threshing gear rod.
9. The threshing apparatus of a combine harvester as defined in claim 1, wherein: the threshing teeth and the grass discharge teeth are finger-shaped teeth.
10. The threshing apparatus of a combine harvester as defined in claim 1, wherein: the diameter of the threshing cylinder is not less than 600mm and not more than 650 mm.
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| CN201710706657.3A CN107396700B (en) | 2017-08-17 | 2017-08-17 | Threshing device of millet combine harvester |
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| CN201710706657.3A CN107396700B (en) | 2017-08-17 | 2017-08-17 | Threshing device of millet combine harvester |
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| CN107396700B true CN107396700B (en) | 2022-12-23 |
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| CN111820012B (en) * | 2020-07-21 | 2022-08-09 | 河南科技大学 | Flexible concave sieve with rotatable threshing unit |
| CN114557198A (en) * | 2022-03-02 | 2022-05-31 | 甘肃农业大学 | Transverse axial flow threshing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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