A combine harvester and harvesting method for high moisture corn

Abstract

The application provides a combined harvester and harvesting method suitable for high-moisture corn, which comprises a shake-off prevention header, a triple threshing device, a screening and collecting device and a cleaning and walking chassis. The shake-off prevention header is provided with a disc-shaped grain separating cutter head to reduce the loss of the header. The triple threshing device comprises a first threshing device, a second threshing device and a third threshing device. The second threshing device adopts a tooth-shaped filtering conveyor belt to cooperate with a conveyor belt grid to tear, rub and knead the water-containing and sticky material. The third threshing device adopts a sawtooth-shaped filtering strip to realize high-frequency reciprocating shaking and cutting, thereby realizing deep threshing. The cleaning and walking chassis is provided with two air blowers, which are respectively used for air drying and blowing away light impurities of the material after first-stage threshing and deep air cleaning of the material after third-stage shaking. The harvesting method comprises the steps of low-loss header feeding, first-stage beating threshing, second-stage tearing threshing, third-stage shaking threshing and grain collecting and returning to the field. The application can effectively reduce the loss rate of the header and the impurity content of the high-moisture corn and improve the harvesting efficiency.

Description

Technical Field

[0001] This invention belongs to the field of agricultural harvesting machinery and crop threshing and cleaning technology, and particularly relates to a combine harvester and harvesting method suitable for millet with high moisture content. Background Technology

[0002] Currently, combine harvesters are widely used in harvesting various crops. Millet, as a typical small-grain crop, has light and small grains that are easily detached during maturity. In actual production operations, due to morning dew, harvesting after rain, or the moisture content characteristics of specific crop varieties, there are often situations where it is necessary to directly harvest millet in a moist state (i.e., "high moisture content millet").

[0003] Existing general-purpose combine harvesters face significant technical bottlenecks when handling millet with high moisture content. Firstly, during the header harvesting stage, traditional reels and cutters cause substantial physical impact and shaking to the millet plants. Because high-moisture-content millet grains are highly brittle, the intense shaking during harvesting results in a large number of grains falling into the field before reaching the threshing unit. Furthermore, the existing headers lack any receiving or recovery structures at the bottom, leading to significant losses at the header's front end. In addition, the traditional header's separating and cutting devices are integrated and fixed, lacking grain receiving trays or splash guards for high moisture content conditions; once grains fall at the header's front end, they cannot be recovered. Secondly, during the threshing and cleaning stages, the high moisture content on the crop surface creates a capillary-driven "liquid bridge" effect between material particles, causing severe adhesion between small grains, broken leaves, short stalks, and husks, forming soft, wet clumps. This liquid bridge is not only difficult to break down under the high-frequency vibration of traditional vibrating screens, but the material compaction further exacerbates the clogging of the screen holes. The structure of traditional single-stage or double-stage threshing drums combined with ordinary vibrating screens lacks functional components that apply shearing and tearing action to wet and sticky clumps. It cannot effectively tear and break up these sticky clumps, which easily leads to incomplete threshing and severe screen clogging.

[0004] In summary, existing harvesting machinery lacks a mechanism to prevent swaying and protect the front end of high-moisture-content millet during harvesting. It also lacks a multi-stage deep threshing and cleaning structure capable of forcibly tearing apart sticky, high-moisture materials, thus failing to simultaneously meet the dual requirements of "low header loss" and "efficient anti-clogging cleaning." Therefore, there is an urgent need to develop a combine harvester and harvesting method specifically for high-moisture-content millet to reduce the loss rate and impurity content during harvesting, thereby improving overall harvesting performance. Summary of the Invention

[0005] This invention provides a combine harvester and harvesting method suitable for millet with high moisture content, which solves at least one of the many problems described in the background art above, so as to achieve low loss and high efficiency harvesting of millet with high moisture content.

[0006] This invention features an anti-shaking header equipped with a disc-shaped divider cutter to collect grains that fall due to shaking during harvesting, reducing header loss. The triple threshing device includes a first threshing unit, a second threshing unit, and a third threshing unit. The second threshing unit uses a toothed filter conveyor belt with conveyor belt baffles to tear and knead the water-containing, sticky material. The third threshing unit uses serrated filter strips for high-frequency reciprocating shaking and cutting, achieving deep threshing. The cleaning chassis is equipped with two blowers, used for air drying and removing light impurities from the material after the first-stage threshing, and for deep air separation of the material after the third-stage shaking. The harvesting method includes low-loss header feeding, first-stage impact threshing, second-stage tearing threshing, third-stage shaking threshing, and grain collection and return to the field steps. This invention effectively reduces header loss and impurity content in high-moisture-content millet, improving harvesting efficiency.

[0007] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0008] A combine harvester suitable for millet with high moisture content includes a shake-resistant header, a triple threshing device, a screening and collecting device, and a cleaning and walking chassis;

[0009] The triple threshing device is mounted on the upper side of the cleaning and walking chassis. The anti-shaking cutting platform is located in front of the triple threshing device and connected to it via a conveying pipe, used to transport the harvested millet to the triple threshing device. The screening and collecting device is mounted on the cleaning and walking chassis and located below the triple threshing device, used to collect the threshed grains. The cleaning and walking chassis supports all components and provides the machine with walking and operating power.

[0010] The triple threshing device includes a threshing frame, a first threshing device, a second threshing device, and a third threshing device. The first threshing device is mounted on the threshing frame and is used for primary threshing of the fed millet. The second threshing device is located behind the first threshing device and mounted on the threshing frame. It is used to receive the material processed by the first threshing device and to tear and thresh water-containing, sticky materials. The second threshing device includes a toothed filter conveyor belt and conveyor belt dividers evenly spaced between them. The toothed filter conveyor belt conveys material backward, and the conveyor belt dividers cooperate with the toothed filter conveyor belt. The toothed structure of the filter conveyor belt pulls and kneads the water-containing, sticky materials; the third threshing device is located below the second threshing device and is used to receive the materials processed by the second threshing device and perform deep threshing; the third threshing device includes multiple serrated filter strips, which are equidistantly distributed to form an integrated screen body. The upper end of the integrated screen body is movably constrained on the frame of the threshing device, and the lower end is connected to a crank-connecting rod mechanism through a shaking connecting block. The crank-connecting rod mechanism is driven by the power output shaft of the cleaning and walking chassis to drive the integrated screen body to perform compound reciprocating oscillation in the front and back directions.

[0011] In the above scheme, the anti-shaking header includes a reel, a dividing cutter disc, a feeding agitator, a header frame, a cutter blade, and a sandwich plate;

[0012] The header frame is installed at the front end of the cleaning and walking chassis; the dividing cutter disc has a disc-shaped structure and is installed at the bottom of the header frame through the sandwich plate to catch the grains that fall due to shaking; the cutters are arranged on the left and right sides of the dividing cutter disc and move left and right with the dividing cutter disc to cut the millet stalks; the reel is installed on the header frame to agitate the millet; the feeding agitator is installed on the header frame to gather the cut millet and feed it into the conveying pipe.

[0013] Furthermore, it also includes a cutting platform drive system; the cutting platform drive system is located behind the anti-shaking cutting platform, the power input end of the cutting platform drive system is connected to the power output shaft of the cleaning and walking chassis, and the power output end of the cutting platform drive system is connected to the anti-shaking cutting platform to distribute power to the anti-shaking cutting platform.

[0014] Furthermore, the header transmission system includes a power input spindle, a first sprocket set of the reel, a second sprocket set of the reel, a feed agitator sprocket, and a cutter connecting ring;

[0015] The power input spindle is located behind the header frame, and its power input end is connected to the power output shaft of the cleaning and traveling chassis to receive power from the chassis. The first sprocket set of the reel is coaxially connected to the upper main shaft of the reel. The second sprocket set of the reel is coaxially connected to the lower main shaft of the reel. The feed agitator sprocket is coaxially connected to the left side of the feed agitator. One end of the cutter connecting ring is connected to the sandwich plate, and the other end is connected to the power input spindle via a connecting rod to convert the rotational motion into a transverse reciprocating cutting motion.

[0016] In the above scheme, the second threshing device further includes a conveyor belt drive shaft, a conveyor belt baffle, and a conveyor belt driven shaft;

[0017] The conveyor belt drive shaft and the conveyor belt driven shaft are mounted on the threshing device frame via bearing seats and are connected to the toothed filter conveyor belt; the conveyor belt baffles are fixed at equal intervals between the gaps in the toothed filter conveyor belt; the conveyor belt baffles are arranged on the left and right sides of the toothed filter conveyor belt.

[0018] In the above scheme, the third threshing device also includes a threshing device frame crossbar, a sawtooth filter bar top connecting ring, a sawtooth filter bar top connecting rod, and a sawtooth filter bar top connecting plate;

[0019] The serrated filter strip is provided with a serrated filter strip top connecting ring. The serrated filter strip top connecting rod passes through the serrated filter strip top connecting ring to install the serrated filter strip on the serrated filter strip top connecting plate, so that the serrated filter strips are evenly distributed front and back and form an integrated screen body. The upper end of the serrated filter strip top connecting rod is movably constrained to the threshing device frame through an elongated hole, so that the integrated screen body, driven by the crank connecting rod mechanism, performs a compound reciprocating swing in the front and back directions.

[0020] The lower end of the connecting rod at the top of the serrated filter strip passes through the connecting plate at the top of the serrated filter strip and is hinged to the upper hole of the shaking connecting block; the lower hole of the shaking connecting block is coaxially hinged to the crossbar of the threshing device frame.

[0021] The vibrating connecting block is driven by a crank-connecting rod mechanism; the power input end of the crank-connecting rod mechanism is connected to the power output shaft, and the output end of the crank-connecting rod mechanism is hinged to the vibrating connecting block.

[0022] In the above scheme, the triple threshing device also includes a returning-to-field device; the returning-to-field device includes a cutting blade and a returning-to-field guide plate; multiple cutting blades are arranged at equal intervals and connected to the tail end of the threshing device frame, used to receive the rice stalks and impurities discharged from the toothed filter conveyor belt and cut and crush them; the returning-to-field guide plate is set below the cutting blades, used to guide the crushed stalks in a directional manner and throw them outside the machine.

[0023] In the above scheme, the screening and collection device includes a first threshing device filter plate, a third threshing device filter plate, a millet collection guide plate, and a millet collection box;

[0024] The first threshing device filter plate is mounted on the threshing device frame and located below the threshing drum, for receiving and filtering material from the first threshing device; the third threshing device filter plate is mounted on the threshing device frame and located below the serrated filter strip, for receiving and filtering material from the third threshing device; the millet collection guide plate is mounted on the cleaning and traveling chassis and located below the first and third threshing device filter plates, for receiving and guiding the filtered millet grains to the millet collection box; the millet collection box is mounted on the cleaning and traveling chassis and located below the discharge end of the millet collection guide plate, for storing the collected millet grains.

[0025] In the above scheme, the cleaning and walking chassis includes a chassis frame, a first threshing device blower, a second threshing device blower, an engine main shaft, and a power output shaft;

[0026] The engine spindle is mounted on the chassis frame and is used to output the operating power of the entire machine;

[0027] The power output shaft is driven to the main shaft of the engine. The output end of the power output shaft is driven to the header transmission system and the triple threshing device respectively through a transfer mechanism, so as to transmit power to the header transmission system and the triple threshing device respectively.

[0028] The blower of the first threshing device is mounted on the chassis frame, and the air outlet of the blower faces the area between the threshing drum and the filter plate of the first threshing device, for drying and cleaning the material processed by the first threshing device.

[0029] The blower of the second threshing device is mounted on the chassis frame. The air outlet of the blower faces the area between the serrated filter strip and the filter plate of the third threshing device, and is used to air dry and clean the material processed by the third threshing device.

[0030] A method for harvesting millet with high moisture content, using a combine harvester suitable for millet with high moisture content, includes the following steps:

[0031] Low-loss header feeding: When the harvester is moving, the millet is harvested through the anti-shaking header and smoothly transported to the triple threshing device through the conveying pipe;

[0032] First-stage impact threshing: The first threshing device performs primary impact threshing on the material. The falling material is filtered by the filter plate of the first threshing device and then dried and cleaned by the blower of the first threshing device.

[0033] Second-stage tearing threshing: The wet and sticky material that has not been completely threshed is conveyed backward to the second threshing device, where the toothed filter conveyor belt and the conveyor belt grid bars work together to tear the material and break up the agglomerated structure of the sticky material.

[0034] Three-stage shaking threshing: The torn material enters the third threshing device, where the integrated screen body performs a compound reciprocating swing in the front and back directions. The sawtooth edges of the sawtooth filter strips cut and shake off the residual sticky material, while the blower of the second threshing device performs air separation.

[0035] Grain collection and return to the field: After the threshed grains pass through the filter plates of the first threshing device and / or the filter plates of the third threshing device, they are collected by the millet collection guide plate and flow into the millet collection box. The remaining straw is discharged from the machine by the return-to-field device to complete the operation.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] 1. The present invention provides a disc-shaped grain divider at the bottom of the anti-shaking cutting platform, which can actively catch high-moisture millet grains that fall off prematurely due to the impact of the reel and mechanical shaking during the harvesting operation, thus reducing the natural grain loss of the harvester during the feeding stage.

[0038] 2. The present invention, through the cooperation of the toothed filter conveyor belt and the conveyor belt grid strip in the second threshing device, can tear apart the sticky clumps with high moisture content after initial threshing, which form "moisture-liquid bridges", effectively breaking up the wet and soft materials and alleviating the problem that traditional vibrating screens are easily blocked by wet mud and wet husks.

[0039] 3. In the third threshing device, the serrated filter strip is driven by the bottom power to perform high-frequency reciprocating shaking. The sharp edges of the serrations and the violent inertial vibration are used to perform secondary cutting and vibration to peel off stubborn wet grains remaining on long stalks or broken leaves. This is beneficial to improve the threshing effect of small-diameter, high-moisture millet and reduce entrainment loss.

[0040] 4. This invention addresses the characteristics of millet—small particle size and light weight—which makes it prone to "blowing loss" due to large air volumes. It breaks down the air separation process into two parts: the first threshing unit's blower is responsible for surface drying and removing light impurities from the millet after threshing by the threshing drum; the second threshing unit's blower, in conjunction with the high-frequency vibration of the third threshing unit, is responsible for deep drying and secondary cleaning of agglomerated, high-moisture-content millet. This multi-stage, precise air delivery effectively removes dispersed wet impurities while minimizing the risk of large air volumes blowing away valuable grains. This step-by-step, point-to-point air separation balances drying and impurity removal with reduced grain loss, alleviating the conflict between large air volumes and low losses in traditional cleaning systems.

[0041] 5. This invention, targeting the differences in the state of high-moisture-content millet materials, employs a "grading flexible initial threshing" method. This effectively reduces the grain breakage rate and alleviates the processing load of subsequent devices. Through the high-speed rotation of the threshing drum and threshing teeth in the first threshing device, the un-clumped, relatively low-moisture-content, easily detachable portions of the high-moisture-content millet population are preferentially combed and beaten. This not only ensures that these grains detach from the stalks first and safely, reducing unnecessary mechanical damage during subsequent strong tearing and rubbing, but also pre-screens out a portion of the material, reducing the amount of sticky material accumulating in the second and third threshing devices, thus alleviating the processing load of subsequent devices and contributing to improved smoothness of continuous operation and overall threshing efficiency. Attached Figure Description

[0042] Figure 1 This is a diagram showing the distribution of components of a combine harvester suitable for high moisture content millet according to one embodiment of the present invention.

[0043] Figure 2 This is a front structural view of the anti-shake cutting table according to an embodiment of the present invention.

[0044] Figure 3 This is a partial schematic diagram of the cutting platform and transmission system according to an embodiment of the present invention.

[0045] Figure 4 This is an overall structural diagram of the triple threshing device according to one embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of the structure of the first threshing device according to an embodiment of the present invention.

[0047] Figure 6 This is a schematic diagram of the structure of the second threshing device according to an embodiment of the present invention.

[0048] Figure 7 This is a schematic diagram of the third threshing device and the returning device according to one embodiment of the present invention.

[0049] Figure 8This is a detailed schematic diagram of the shaking mechanism of the third threshing device according to an embodiment of the present invention.

[0050] Figure 9 This is a schematic diagram of the screening and collection device according to an embodiment of the present invention.

[0051] Figure 10 This is a diagram of the cleaning and walking chassis and its power distribution according to an embodiment of the present invention.

[0052] In the diagram: 101-Reeling reel, 102-Dividing cutter disc, 103-Feeding agitator, 104-Header frame, 105-Cutter, 106-Sandwich plate, 201-Power input spindle, 202-Reeling reel first sprocket assembly, 203-Reeling reel second sprocket assembly, 204-Feeding agitator sprocket, 205-Cutter connecting ring, 3-Triple threshing device, 301-Threshing device frame, 302-First threshing device, 302 / 1-Bearing seat, 302 / 2-Threshing drum, 302 / 3-Threshing spring teeth, 303-Second threshing device, 303 / 1-Conveyor belt drive shaft, 303 / 2-Toothed filter conveyor belt, 303 / 3-Conveyor belt baffle, 303 / 4-Conveyor belt baffle plate, 303 / 5-Conveyor belt driven shaft, 304-Third threshing device, 304 / 1-Serrated filter strip, 304 / 2-Threshing device frame crossbar, 304 / 3-Serrated filter strip top connecting ring, 304 / 4-Serrated filter strip top connecting rod, 304 / 5-Serrated filter strip top connecting plate, 304 / 6-Shaking connecting block, 305-Returning to field device, 305 / 1-Cut knife, 305 / 2-Returning to field guide plate, 401-First threshing device filter plate, 402-Threshing device filter plate, 403-Millet collection guide plate, 404-Millet collection box, 5-Cleaning walking chassis, 501-First threshing device blower, 502-Second threshing device blower, 504-Power output shaft. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "front," "rear," "left," "right," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Figure 1-10 The diagram shows a preferred embodiment of the combine harvester suitable for high moisture content millet. The combine harvester includes a shock-resistant header 1, a header transmission system 2, a triple threshing device 3, a screening and collecting device 4, and a cleaning and traveling chassis 5. The triple threshing device 3 is located on the upper side of the cleaning and traveling chassis 5. The shock-resistant header 1 is located in front of the triple threshing device 3 and connected to it via a conveying pipe, used to transport the harvested millet to the triple threshing device 3. The screening and collecting device 4 is located on the cleaning and traveling chassis 5 and below the triple threshing device 3, used to collect the threshed grains. The cleaning and traveling chassis 5 supports all components and provides the machine with traveling and operating power. The cutting platform transmission system 2 is located behind the anti-shaking cutting platform 1. The power input end of the cutting platform transmission system 2 is connected to the power output shaft 504 of the cleaning and walking chassis 5, and the power output end of the cutting platform transmission system 2 is connected to the anti-shaking cutting platform 1 to distribute power to the anti-shaking cutting platform 1.

[0056] like Figure 4-8As shown, the triple threshing device 3 includes a threshing device frame 301, a first threshing device 302, a second threshing device 303, and a third threshing device 304. The first threshing device 302 is mounted on the threshing device frame 301 and is used to perform primary threshing of the fed millet. The second threshing device 303 is located behind the first threshing device 302 and mounted on the threshing device frame 301. It is used to receive the material processed by the first threshing device 302 and to tear and thresh the water-containing and sticky material. The second threshing device 303 includes a toothed filter conveyor belt 303 / 2 and conveyor belt baffles 303 / 3 equidistantly installed between its gaps. The toothed filter conveyor belt 303 / 2 conveys the material backward, and the conveyor belt baffles 303 / 3... The toothed structure of the toothed filter conveyor belt 303 / 2, in conjunction with 03 / 3, pulls and kneads the water-containing and sticky materials; the third threshing device 304 is located below the second threshing device 303 and is used to receive the materials processed by the second threshing device 303 and perform deep threshing; the third threshing device 304 includes multiple sawtooth filter strips 304 / 1, which are equidistantly distributed and form an integrated screen body. The upper end of the integrated screen body is movably constrained on the frame 301 of the threshing device, and the lower end is connected to the crank connecting rod mechanism through the shaking connecting block 304 / 6. The crank connecting rod mechanism is connected to the power output shaft 504 of the cleaning and walking chassis 5 and is used to drive the integrated screen body to perform compound reciprocating swing in the front and back directions.

[0057] like Figure 2 , Figure 3 As shown, the anti-shaking header 1 includes a reel 101, a dividing cutter disc 102, a feeding agitator 103, a header frame 104, cutters 105, and a sandwich plate 106. The header frame 104 is installed at the front end of the cleaning and walking chassis 5. The dividing cutter disc 102 has a disc-shaped structure and is installed at the bottom of the header frame 104 through the sandwich plate 106 to catch grains that fall due to shaking. The cutters 105 are arranged on the left and right sides of the dividing cutter disc 102 and move left and right with the dividing cutter disc 102 to cut the millet stalks. The reel 101 is installed on the header frame 104 to agitate the millet. The feeding agitator 103 is installed on the header frame 104 to gather the cut millet and feed it into the conveying pipe.

[0058] The working principle of the anti-shaking header 1 is as follows: During operation, the reel 101 adjusts its height via a hydraulic rod, guiding the millet stalks towards the header; the cutter 105 reciprocates with the dividing cutter disc 102, cutting the millet stalks; millet grains that fall off prematurely due to the impact of the reel and mechanical vibration during the cutting process fall directly into the disc-shaped dividing cutter disc 102 below, and are gathered together with the cut millet stalks by the feeding agitator 103 and fed into the conveying pipe. This design helps reduce the loss of high-moisture-content millet at the front end.

[0059] The header transmission system 2 includes a power input main shaft 201, a first sprocket set 202 for the reel, a second sprocket set 203 for the reel, a feed agitator sprocket 204, and a cutter connecting ring 205. The power input main shaft 201 is located behind the header frame 104, and its power input end is connected to the power output shaft 504 of the cleaning and traveling chassis 5 to receive power from the chassis. The first sprocket set 202 for the reel is coaxially connected to the upper main shaft of the reel 101. The second sprocket set 203 for the reel is coaxially connected to the lower main shaft of the reel 101. The feed agitator sprocket 204 is coaxially connected to the left side of the feed agitator 103. Using two sets of sprockets to drive the reel ensures the smoothness and reliability of the reel's operation. The feed agitator sprocket 204 is coaxially connected to the left side of the feed agitator 103. One end of the cutter link ring 205 is connected to the sandwich plate 106, and the other end is connected to the power input spindle 201 through a connecting rod. It is used to convert the rotational motion into the transverse reciprocating cutting motion and the rotational motion of the power input spindle 201 into the transverse reciprocating cutting motion of the sandwich plate 106, thereby driving the division cutter disc 102 and the cutter 105 to move.

[0060] The working principle of the header transmission system 2 is as follows: After the power input main shaft 201 receives power from the cleaning and walking chassis 5, it drives the reel 101 to rotate through the chain drive connecting the first sprocket group 202 and the second sprocket group 203 of the reel 101. It drives the feeding agitator 103 to rotate through the chain drive connecting the feeding agitator sprocket 204. The rotational motion is converted into lateral reciprocating motion through the cutter link ring 205, thereby driving the dividing cutter disc 102 and the cutter 105 to move, and driving the cutter 105 to perform cutting operations.

[0061] like Figure 5 As shown, the first threshing device 302 includes a bearing seat 302 / 1, a threshing drum 302 / 2, and threshing spring teeth 302 / 3. The main shaft of the threshing drum 302 / 2 is fixed to the frame 301 of the threshing device via the bearing seat 302 / 1; the threshing spring teeth 302 / 3 are fixed around the threshing drum 302 / 2.

[0062] The working principle of the first threshing device 302: The threshing spring teeth 302 / 3 fixed on the threshing drum 302 / 2 rotate at high speed with the threshing drum 302 / 2, and gently comb and beat the un-clumped and low-moisture-content millet in the high-moisture-content millet, so that some easily detached grains are separated from the stalks first, completing the primary threshing. This design realizes graded flexible primary threshing—prioritizing the treatment of the easily threshed parts, which is beneficial to reducing the grain breakage rate and reducing the processing load of the subsequent devices.

[0063] like Figure 6 As shown, the second threshing device 303 further includes a conveyor belt drive shaft 303 / 1, a conveyor belt baffle 303 / 4, and a conveyor belt driven shaft 303 / 5; the conveyor belt drive shaft 303 / 1 and the conveyor belt driven shaft 303 / 5 are mounted on the threshing device frame 301 via bearing seats and are connected to the toothed filter conveyor belt 303 / 2; the conveyor belt baffle 303 / 3 is fixed at equal intervals between the gaps of the toothed filter conveyor belt 303 / 2; the conveyor belt baffle 303 / 4 is disposed on the left and right sides of the toothed filter conveyor belt 303 / 2.

[0064] The working principle of the second threshing device 303: The toothed filter conveyor belt 303 / 2 conveys material backward under the drive of the conveyor belt drive shaft 303 / 1; the equidistantly distributed conveyor belt baffles 303 / 3, in conjunction with the toothed structure of the conveyor belt, pull and knead the high-moisture-content millet that has clumped together due to moisture, physically breaking down the water-liquid bridges and forcing the grains to separate. The conveyor belt baffles 303 / 4 on both sides are used to prevent wet material from overflowing to both sides during the kneading and tumbling process. This design can effectively break the clumping and clogging problem caused by high-moisture-content millet.

[0065] like Figure 7 , Figure 8 As shown, the third threshing device 304 further includes a threshing device frame crossbar 304 / 2, a serrated filter bar top connecting ring 304 / 3, a serrated filter bar top connecting rod 304 / 4, and a serrated filter bar top connecting plate 304 / 5; the serrated filter bar 304 / 1 is provided with a serrated filter bar top connecting ring 304 / 3, and the serrated filter bar top connecting rod 304 / 4 passes through the serrated filter bar top connecting ring 304 / 3 to install the serrated filter bar 304 / 1 on the serrated filter bar top connecting plate 304 / 5, so that the serrated filter bars 304 / 1 are evenly distributed front and back and form an integrated screen body; the upper end of the serrated filter bar top connecting rod 304 / 4 is movably constrained to the threshing device frame 301 through an elongated hole or a sliding groove structure, so that the integrated screen body is... Driven by the crank-connecting rod mechanism, the entire device performs a compound reciprocating oscillation in the front-to-back direction. The lower end of the sawtooth filter strip top connecting rod 304 / 4 passes through the sawtooth filter strip top connecting plate 304 / 5 and is hinged to the upper hole of the shaking connecting block 304 / 6. The lower hole of the shaking connecting block 304 / 6 is coaxially hinged to the crossbar 304 / 2 of the threshing device frame. The shaking connecting block 304 / 6 is driven by the crank-connecting rod mechanism. The power input end of the crank-connecting rod mechanism is connected to the power output shaft 504 via belt drive or chain drive, and the output end of the crank-connecting rod mechanism is hinged to the shaking connecting block 304 / 6. This structure constitutes multiple sets of parallel rocker support mechanisms, which, driven by the crank-connecting rod mechanism, enable the third threshing device 304 to perform a compound reciprocating oscillation in the front-to-back direction.

[0066] The working principle of the third threshing device 304 is as follows: The movable shaking connecting block 304 / 6 on the crossbar 304 / 2 of the threshing device frame rotates, causing multiple serrated filter strips 304 / 1 connected to the top connecting plate 304 / 5 of the serrated filter strips to undergo high-frequency, compound reciprocating shaking in the front-to-back direction. Utilizing the intense shaking of the serrated filter strips 304 / 1 and their serrated edges, the remaining stubbornly sticky material containing high moisture content is cut and shaken off, further dislodging residual grains. This design helps improve the threshing rate and reduce entrainment losses.

[0067] like Figure 7 As shown, the triple threshing device 3 also includes a returning-to-field device 305; the returning-to-field device 305 is located behind the triple threshing device 3 and fixed on the threshing device frame 301. The returning-to-field device 305 includes a cutting blade 305 / 1 and a returning-to-field guide plate 305 / 2; multiple cutting blades 305 / 1 are arranged at equal intervals and connected to the tail end of the threshing device frame 301, used to receive the rice stalks and impurities discharged from the toothed filter conveyor belt 303 / 2 and cut and crush them; the returning-to-field guide plate 305 / 2 is arranged below the cutting blades 305 / 1, used to guide the crushed stalks in a directional manner and scatter them outside the machine to achieve returning to the field.

[0068] The triple threshing device 3 is used for multi-stage progressive threshing and separation of easily sticky, high-moisture millet. Specifically, the first threshing device 302 threshes the fed millet by beating; the second threshing device 303 receives the incompletely threshed millet and water-laden, sticky millet clumps from the first threshing device 302 and further threshes them; the third threshing device 304 receives the material from the second threshing device 303 and uses shaking to complete deep threshing and separation; and the returning-to-field device 305 processes the final discharged straw and debris and returns it to the field.

[0069] like Figure 9As shown, the screening and collecting device 4 includes a first threshing device filter plate 401, a third threshing device filter plate 402, a millet collection guide plate 403, and a millet collection box 404; the first threshing device filter plate 401 is disposed on the threshing device frame 301 and located below the threshing drum 302 / 2, and is used to receive and filter the material from the first threshing device 302; the third threshing device filter plate 402 is disposed on the threshing device frame 301 and located below the serrated filter strip 304 / 1. The millet collection guide plate 403 is disposed on the cleaning and traveling chassis 5 and located below the filter plates 401 and 402 of the first and third threshing devices, and is used to receive and guide the filtered millet grains to the millet collection box 404; the millet collection box 404 is disposed on the cleaning and traveling chassis 5 and located below the discharge end of the millet collection guide plate 403, and is used to store the collected millet grains.

[0070] The working principle of the screening and collection device 4 is as follows: the filter plate 401 of the first threshing device and the filter plate 402 of the third threshing device respectively receive and filter the mixed materials falling from the first threshing device 302 and the third threshing device 304, blocking large pieces of broken stalks so that the grains can pass through; the pure grains that fall are collected and guided by the millet collection guide plate 403 and stored in the millet collection box 404.

[0071] like Figure 10 As shown, the cleaning and walking chassis 5 includes a chassis frame, a first threshing unit blower 501, a second threshing unit blower 502, an engine main shaft 503, and a power output shaft 504. The engine main shaft 503 is mounted on the chassis frame and is used to output the operating power of the entire machine. The power output shaft 504 is drivenly connected to the engine main shaft 503, and the output end of the power output shaft 504 is drivenly connected to the header transmission system 2 and the triple threshing device 3 respectively through a transfer mechanism, for transmitting power to the header transmission system 2 and the triple threshing device 3 respectively; the first threshing... The device blower 501 is mounted on the chassis frame. The air outlet of the first threshing device blower 501 faces the area between the threshing drum 302 / 2 and the first threshing device filter plate 401, and is used to air dry and clean the material processed by the first threshing device 302. The second threshing device blower 502 is mounted on the chassis frame. The air outlet of the second threshing device blower 502 faces the area between the serrated filter strip 304 / 1 and the third threshing device filter plate 402, and is used to air dry and clean the material processed by the third threshing device 304.

[0072] The working principle of the cleaning chassis 5 is as follows: the engine main shaft 503 and power output shaft 504 provide power for the entire machine; simultaneously, the blower 501 of the first threshing device blows a strong airflow between the threshing drum 302 / 2 and the filter plate 401 of the first threshing device to dry and remove impurities, which helps to alleviate the blockage of the filter plate 401 by the rice stalks; the blower 502 of the second threshing device blows airflow between the serrated filter strip 304 / 1 and the filter plate 402 of the third threshing device to dry the rice grains scattered under high-frequency vibration and remove light impurities. The multi-stage blowing and step-by-step fixed-point cleaning design can effectively balance drying and impurity removal with reducing rice grain loss, alleviating the contradiction between large air volume and low loss in traditional cleaning systems.

[0073] A method for harvesting millet with high moisture content, using a combine harvester suitable for millet with high moisture content, includes the following steps:

[0074] Low-loss header feeding: As the harvester moves, the millet is harvested via the anti-shake header 1 and smoothly conveyed to the triple threshing device 3 through the conveying pipe. Specifically, the reel 101 of the anti-shake header 1 pushes the millet stalks towards the header, and the cutter 105 cuts the millet stalks by reciprocating left and right with the dividing cutter disc 102. During the cutting process, the millet grains that fall due to shaking fall directly into the disc-shaped dividing cutter disc 102 below, and are gathered together with the cut millet stalks by the feeding agitator 103, and then smoothly conveyed to the triple threshing device 3 through the conveying pipe.

[0075] First-stage impact threshing: The first threshing device 302 performs primary impact threshing on the material. The falling material is filtered by the filter plate 401 of the first threshing device and then dried and cleaned by the blower 501 of the first threshing device. Specifically, after the material enters the first threshing device 302, the threshing teeth 302 / 3 fixed on the threshing drum 302 / 2 rotate at high speed with the threshing drum 302 / 2, gently combing and impacting the un-clumped and low-moisture grains in the high-moisture-content millet, causing some easily detached grains to separate from the stalks first. The falling material is filtered by the filter plate 401 of the first threshing device and then dried and cleaned by the blower 501 of the first threshing device.

[0076] Second-stage tearing threshing: Incompletely threshed, wet, and sticky material is conveyed backward to the second threshing device 303, where the toothed filter conveyor belt 303 / 2 and the conveyor belt baffles 303 / 3 work together to tear and break up the clumps of the sticky material. Specifically, the incompletely threshed, wet, and sticky material is conveyed backward to the second threshing device 303. The toothed filter conveyor belt 303 / 2 conveys the material backward under the drive of the conveyor belt drive shaft 303 / 1. The equidistantly distributed conveyor belt baffles 303 / 3, in conjunction with the toothed structure of the toothed filter conveyor belt 303 / 2, pull and knead the high-moisture-content millet grains that are sticking together due to moisture, breaking up the water bridges and forcing the grains to separate. The conveyor belt baffles 303 / 4 on both sides prevent the wet material from overflowing to both sides during the kneading and tumbling process.

[0077] Three-stage shaking threshing: The torn material enters the third threshing device 304, where the integrated screen body performs a compound reciprocating oscillation in the front-to-back direction. This, combined with the serrated edges of the serrated filter strips 304 / 1, cuts and vibrates away any remaining adhered material. Simultaneously, the blower 502 of the second threshing device performs air separation. Specifically, the torn material enters the third threshing device 304, where a crank-connecting rod mechanism drives the shaking connecting block 304 / 6 to rotate, causing multiple serrated filter strips 304 / 1 connected to the top connecting plate 304 / 5 of the serrated filter strips to perform high-frequency compound reciprocating shaking in the front-to-back direction. Utilizing the intense shaking of the serrated filter strips 304 / 1 and their serrated edges, the remaining stubbornly adhered material containing high moisture content is cut and vibrated away, further dislodging the remaining grains. Simultaneously, the blower 502 of the second threshing device performs deep air separation.

[0078] Grain collection and return to the field: After the threshed grains pass through the filter plate 401 of the first threshing device and / or the filter plate 402 of the third threshing device, they are collected by the millet collection guide plate 403 and flow into the millet collection box 404. The remaining straw is cut and crushed by the cutting blade 305 / 1 of the return to the field device 305, and then guided and evenly scattered outside the machine by the return to the field guide plate 305 / 2 to complete the return to the field operation.

[0079] This invention utilizes the disc-shaped dividing cutter disc 102 of the anti-shaking header 1 to catch free grains that fall due to the impact of the reel 101, which helps reduce header loss of high-moisture-content millet. Addressing the characteristics of high-moisture-content millet, which is prone to clumping and sticking, this invention employs a triple threshing device 3 for step-by-step cleaning: after the initial impact of the threshing drum of the first threshing device 302, the toothed filter conveyor belt 303 / 2 of the second threshing device 303, in conjunction with the conveyor belt baffles 303 / 3, tears apart the water-containing, sticky clumps to break up the liquid bridge structure between the crops. The material then enters the third threshing device 304, where it is further cleaned by the saw teeth. The filter strips 304 / 1 are subjected to high-frequency reciprocating shaking and cutting to remove residual grains. Simultaneously, the invention includes a first threshing device blower 501 and a second threshing device blower 502 at the first threshing device 302 and the third threshing device 304, respectively, for air-drying and air-sorting the dispersed high-moisture-content grains. This helps alleviate the problem of wet, soft materials clogging the screen and the problem of large air volumes blowing out lightweight grains. Finally, the invention uses a tail-end returning device 305 to crush and discharge waste grain stalks. The coordinated operation of all structural modules of the machine helps reduce header loss rate and improves the impurity removal effect and operational smoothness of mechanized harvesting of high-moisture-content millet.

[0080] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0081] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A combine harvester suitable for millet with high moisture content, characterized in that, It includes a shaking-proof cutting platform (1), a triple threshing device (3), a screening and collection device (4), and a cleaning and walking chassis (5). The triple threshing device (3) is located on the upper side of the cleaning and walking chassis (5). The anti-shaking cutting platform (1) is located in front of the triple threshing device (3) and is connected to the triple threshing device (3) through a conveying pipe. It is used to transport the harvested millet to the triple threshing device (3). The screening and collecting device (4) is located on the cleaning and walking chassis (5) and below the triple threshing device (3). It is used to collect the threshed millet. The cleaning and walking chassis (5) is used to support the components and provide the machine with walking power and operating power. The triple threshing device (3) includes a threshing device frame (301), a first threshing device (302), a second threshing device (303), and a third threshing device (304). The first threshing device (302) is mounted on the threshing device frame (301) and is used to perform primary threshing of the fed millet. The second threshing device (303) is located behind the first threshing device (302) and mounted on the threshing device frame (301), and is used to receive the material processed by the first threshing device (302) and to tear and thresh the water-containing and sticky material. The second threshing device (303) includes a toothed filter conveyor belt (303 / 2) and conveyor belt baffles (303 / 3) installed at equal intervals between them. The toothed filter conveyor belt (303 / 2) conveys the material backward, and the conveyor belt baffles... The toothed structure of the toothed filter conveyor belt (303 / 2) in conjunction with the strip (303 / 3) is used to pull and knead the water-containing adhesive materials; the third threshing device (304) is located below the second threshing device (303) and is used to receive the materials processed by the second threshing device (303) and perform deep threshing; the third threshing device (304) includes multiple sawtooth filter strips (304 / 1), the multiple sawtooth filter strips (304 / 1) are equidistantly distributed and form an integrated screen body, the upper end of the integrated screen body is movably constrained on the frame (301) of the threshing device, and the lower end is connected to the crank connecting rod mechanism through the shaking connecting block (304 / 6). The crank connecting rod mechanism is connected to the power output shaft (504) of the cleaning walking chassis (5) for driving the integrated screen body to perform compound reciprocating swing in the front and back directions.

2. The combine harvester for high moisture content millet according to claim 1, characterized in that, The anti-shaking header (1) includes a reel (101), a splitting cutter disc (102), a feeding agitator (103), a header frame (104), a cutter (105), and a sandwich plate (106). The header frame (104) is installed at the front end of the cleaning and walking chassis (5); the dividing cutter disc (102) has a disc-shaped structure and is installed at the bottom of the header frame (104) through the interlayer plate (106) to catch the grains that fall due to shaking; the cutter (105) is set on the left and right sides of the dividing cutter disc (102) and moves left and right with the dividing cutter disc (102) to cut the millet stalks; the reel (101) is installed on the header frame (104) to agitate the millet; the feeding agitator (103) is installed on the header frame (104) to gather the cut millet and feed it into the conveying pipe.

3. The combine harvester for high moisture content millet according to claim 2, characterized in that, It also includes a cutting platform drive system (2); the cutting platform drive system (2) is located behind the anti-shaking cutting platform (1), the power input end of the cutting platform drive system (2) is connected to the power output shaft (504) of the cleaning walking chassis (5), and the power output end of the cutting platform drive system (2) is connected to the anti-shaking cutting platform (1) to distribute power to the anti-shaking cutting platform (1).

4. The combine harvester for high moisture content millet according to claim 3, characterized in that, The header transmission system (2) includes a power input spindle (201), a first sprocket set of the reel (202), a second sprocket set of the reel (203), a feed agitator sprocket (204), and a cutter connecting ring (205). The power input spindle (201) is located behind the header frame (104). The power input end of the power input spindle (201) is connected to the power output shaft (504) of the cleaning walking chassis (5) for receiving power from the cleaning walking chassis (5). The first sprocket set (202) of the reel is coaxially connected to the upper main shaft of the reel (101). The second sprocket set (203) of the reel is coaxially connected to the lower main shaft of the reel (101). The feeding agitator sprocket (204) is coaxially connected to the left side of the feeding agitator (103). One end of the cutter connecting ring (205) is connected to the sandwich plate (106), and the other end is connected to the power input spindle (201) through a connecting rod for converting the rotational motion into transverse reciprocating cutting motion.

5. The combine harvester for high moisture content millet according to claim 1, characterized in that, The second threshing device (303) also includes a conveyor belt drive shaft (303 / 1), a conveyor belt baffle (303 / 4), and a conveyor belt driven shaft (303 / 5). The drive shaft (303 / 1) and driven shaft (303 / 5) of the conveyor belt are mounted on the frame (301) of the threshing device via bearing seats and connected to the toothed filter conveyor belt (303 / 2); the conveyor belt baffles (303 / 3) are fixed at equal intervals between the gaps of the toothed filter conveyor belt (303 / 2); and the conveyor belt baffles (303 / 4) are located on the left and right sides of the toothed filter conveyor belt (303 / 2).

6. The combine harvester for high moisture content millet according to claim 1, characterized in that, The third threshing device (304) also includes a threshing device frame crossbar (304 / 2), a sawtooth filter strip top connecting ring (304 / 3), a sawtooth filter strip top connecting rod (304 / 4), and a sawtooth filter strip top connecting plate (304 / 5). The serrated filter strip (304 / 1) is provided with a serrated filter strip top connecting ring (304 / 3). The serrated filter strip top connecting rod (304 / 4) passes through the serrated filter strip top connecting ring (304 / 3) to install the serrated filter strip (304 / 1) on the serrated filter strip top connecting plate (304 / 5), so that the serrated filter strip (304 / 1) is evenly distributed front and back and forms an integrated screen body. The upper end of the serrated filter strip top connecting rod (304 / 4) is movably constrained on the threshing device frame (301) through an elongated hole, so that the integrated screen body, driven by the crank connecting rod mechanism, performs a compound reciprocating swing in the front and back direction. The lower end of the sawtooth filter strip top connecting rod (304 / 4) passes through the sawtooth filter strip top connecting plate (304 / 5) and is hinged to the upper hole of the shaking connecting block (304 / 6); the lower hole of the shaking connecting block (304 / 6) is coaxially hinged to the cross bar (304 / 2) of the threshing device frame. The vibrating connecting block (304 / 6) is driven to connect a crank-connecting rod mechanism; the power input end of the crank-connecting rod mechanism is connected to the power output shaft (504) and the output end of the crank-connecting rod mechanism is hinged to the vibrating connecting block (304 / 6).

7. The combine harvester for high moisture content millet according to claim 1, characterized in that, The triple threshing device (3) also includes a field return device (305); The returning-to-field device (305) includes a cutting blade (305 / 1) and a returning-to-field guide plate (305 / 2); multiple cutting blades (305 / 1) are arranged at equal intervals and connected to the tail end of the threshing device frame (301) to receive the rice stalks and impurities discharged from the toothed filter conveyor belt (303 / 2) and cut and crush them; the returning-to-field guide plate (305 / 2) is located below the cutting blades (305 / 1) to direct and scatter the crushed stalks outside the machine.

8. The combine harvester for high moisture content millet according to claim 1, characterized in that, The screening and collecting device (4) includes a first threshing device filter plate (401), a third threshing device filter plate (402), a millet collection guide plate (403), and a millet collection box (404). The first threshing device filter plate (401) is disposed on the threshing device frame (301) and located below the threshing drum (302 / 2), and is used to receive and filter the material from the first threshing device (302); the third threshing device filter plate (402) is disposed on the threshing device frame (301) and located below the serrated filter strip (304 / 1), and is used to receive and filter the material from the third threshing device (304); the millet collection guide plate (403) is disposed on the cleaning walking chassis (5) and located below the first threshing device filter plate (401) and the third threshing device filter plate (402), and is used to receive and guide the filtered millet grains to the millet collection box (404); the millet collection box (404) is disposed on the cleaning walking chassis (5) and located below the discharge end of the millet collection guide plate (403), and is used to store the collected millet grains.

9. The combine harvester for high moisture content millet according to claim 1, characterized in that, The cleaning chassis (5) includes a chassis frame, a first threshing device blower (501), a second threshing device blower (502), an engine main shaft (503), and a power output shaft (504). The engine main shaft (503) is mounted on the chassis frame and is used to output the operating power of the whole machine; The power output shaft (504) is connected to the engine main shaft (503) for transmission. The output end of the power output shaft (504) is connected to the cutter head transmission system (2) and the triple threshing device (3) respectively through the transfer mechanism, for transmitting power to the cutter head transmission system (2) and the triple threshing device (3) respectively. The blower (501) of the first threshing device is mounted on the chassis frame. The air outlet of the blower (501) of the first threshing device faces the area between the threshing drum (302 / 2) and the filter plate (401) of the first threshing device, and is used to air dry and clean the material after it has been processed by the first threshing device (302). The blower (502) of the second threshing device is mounted on the chassis frame. The air outlet of the blower (502) of the second threshing device faces the area between the serrated filter strip (304 / 1) and the filter plate (402) of the third threshing device, and is used to air dry and clean the material after it has been processed by the third threshing device (304).

10. A method for harvesting millet with high moisture content, characterized in that, The method, employing a combine harvester suitable for high moisture content millet as described in any one of claims 1-9, comprises the following steps: Low-loss header feeding: When the harvester is moving, the millet is harvested through the anti-shaking header (1) and smoothly transported to the triple threshing device (3) through the conveying pipe. First-stage impact threshing: The first threshing device (302) performs primary impact threshing on the material. The falling material is filtered by the filter plate (401) of the first threshing device and dried and cleaned by the blower (501) of the first threshing device. Second-stage tearing threshing: The wet and sticky material that is not completely threshed is conveyed backward to the second threshing device (303), where it is torn apart by the toothed filter conveyor belt (303 / 2) and the conveyor belt baffle (303 / 3) to break the agglomerated structure of the sticky material. Three-stage shaking threshing: The torn material enters the third threshing device (304), where the integrated screen body performs a compound reciprocating swing in the front and back directions. The sawtooth edges of the sawtooth filter strip (304 / 1) cut and shake off the residual sticky material. At the same time, the blower (502) of the second threshing device performs air separation. Grain collection and return to the field: After the threshing grains pass through the filter plate (401) of the first threshing device and / or the filter plate (402) of the third threshing device, they are collected by the millet collection guide plate (403) and flow into the millet collection box (404). The remaining straw is discharged from the machine by the return-to-field device (305) to complete the operation.

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