Low-loss high-efficiency double-longitudinal flow threshing and separating device

Abstract

The utility model discloses a low loss high -efficient double longitudinal axial flow threshing and separating device, including feeding wheel subassembly, feed bottom shell, left axial flow cylinder, right axial flow cylinder, upper cover subassembly, threshing concave, separating concave, separating concave gap adjusting device, threshing concave gap adjusting device, straw discharge wheel, straw discharge concave, cylinder transmission subassembly, the left axial flow cylinder and right axial flow cylinder top are provided with upper cover subassembly, the left axial flow cylinder and right axial flow cylinder below are equipped with feed bottom shell, threshing concave, separating concave respectively in proper order, the threshing concave, separating concave top is provided with threshing concave gap adjusting device, separating concave gap adjusting device respectively, can carry out corresponding concave gap adjustment, this low loss high -efficient double longitudinal axial flow threshing and separating device under the condition of satisfying feeding amount low loss, high -efficient grain threshing and separating, satisfy a variety of crop harvesting, improve the operation efficiency and grain harvesting quality of harvester, reduce operating cost.

Description

Technical Field

[0001] This utility model relates to the field of harvester technology, specifically to a low-loss, high-efficiency dual longitudinal axial flow threshing and separating device. Background Technology

[0002] In the combined harvesting of agricultural grains, the threshing drum is one of the key components of the combine harvester, and its performance directly affects the harvesting efficiency, grain loss rate, and power consumption of the machine.

[0003] Existing combine harvesters have problems such as low linear velocity in the connection area between the bridge and the feeding blades when conveying materials, and dead zones on both sides of the feeding inlet that cannot be grabbed by the feeding helical blades. Especially when the harvested crop is wet, feeding may be difficult and power consumption may be high, affecting the harvester's operating efficiency and grain harvesting quality. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a low-loss and high-efficiency dual longitudinal axial flow threshing and separating device. It can thresh and separate grains with low loss and high efficiency under the condition of meeting the feeding amount, meet the harvesting of various crops, improve the operating efficiency of harvesters and the quality of grain harvesting, reduce operating costs, and effectively solve the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-loss and high-efficiency dual longitudinal axial flow threshing and separating device, comprising a feeding wheel assembly, a feeding bottom shell, a left axial flow drum, a right axial flow drum, an upper cover assembly, a threshing concave plate, a separating concave plate gap adjustment device, a straw discharge wheel, a straw discharge concave plate, and a drum transmission assembly; A top cover assembly is provided above the left and right axial flow drums, and a feeding bottom shell, a threshing concave plate, and a separation concave plate are respectively provided below the left and right axial flow drums. The threshing concave plate and the separating concave plate are respectively equipped with a threshing concave plate gap adjustment device and a separating concave plate gap adjustment device, which can be used to adjust the concave plate gap accordingly. A feeding wheel assembly is provided above the feeding bottom shell, and the power input end of the feeding wheel assembly is connected to the front end of the left axial flow roller; The left and right axial flow rollers are equipped with roller drive components at their rear ends to provide rotational power for the left and right axial flow rollers; The lower rear side of the left and right axial flow rollers is provided with a grass-removing wheel, and a grass-removing concave plate is provided below the grass-removing wheel.

[0006] As a preferred technical solution of this utility model, the upper cover assembly, the threshing concave plate, and the separation concave plate form a closed threshing and separation space, and the left axial flow roller and the right axial flow roller are arranged longitudinally inclined in the closed threshing and separation space with parallel axes.

[0007] As a preferred technical solution of this utility model, the left axial flow drum and the right axial flow drum have symmetrical structures. The left axial flow drum includes a feeding section, a threshing section and a separation section in sequence. The feeding section is located at the front end of the threshing section and the separation section is located at the rear end of the threshing section. The feeding section occupies 1 / 5 of the total drum length, the threshing section occupies 2 / 5 of the total drum length, and the separation section occupies 2 / 5 of the total drum length. The feeding section of the left axial flow roller has a conical structure with six helical blades evenly distributed along the circumference of the conical cylinder. These blades are of two types: feeding blade I and feeding blade II. Three feeding blades I and three feeding blades II are alternately arranged along the circumference of the conical cylinder. The front ends of the three feeding blades I start at the very front of the feeding section, while the starting points of the three feeding blades II are located at 1 / 6 of the front end of the feeding section. The feeding blades II have a gradually increasing size. The roller transmission assembly drives the left and right axial flow rollers to rotate inwards, and the phase angle difference between the blades in the feeding section is 60°. The threshing section of the left axial flow drum is equipped with threshing elements, which are spirally arranged on the left axial flow drum. The threshing elements are arranged in a triple spiral along the feed blade I, with the inner circle being a closed shaft tube. There is a certain overlap area between adjacent threshing elements arranged in the same spiral. The top texture of the threshing element is at an angle to the axis of the left axial flow drum, and the rear guide shape of the threshing element is at an angle to the axis of the left axial flow drum. The threshing section of the left axial flow drum is equipped with a separation element. The separation element adopts a toothed structure. The arrangement of the toothed structure is a triple spiral. The toothed structure is tilted backward at a certain angle and the top is rounded. The end of the toothed structure is provided with a straight blade for discharging straw.

[0008] As a preferred technical solution of this utility model, the upper cover assembly includes a first roller upper cover, a second roller upper cover, an electric push rod assembly, a first guide plate assembly, a second guide plate assembly, a first adjusting blade assembly, a second adjusting blade assembly, guide plate I, and guide plate II; The first roller cover and the second roller cover are fixedly connected. The radius of the first roller cover is smaller than that of the second roller cover and their axes coincide, forming a two-stage stepped enlarged structure. The first guide plate assembly and the second guide plate assembly are symmetrically fixedly arranged inside the first roller cover. The first adjusting blade assembly and the second adjusting blade assembly are symmetrically hinged to the inside of the second roller cover. The guide plate I and the guide plate II are symmetrically fixedly arranged at the rear ends of the first adjusting blade assembly and the second adjusting blade assembly inside the second roller cover. One end of the electric actuator assembly is fixedly disposed on the upper outer side of the first upper cover plate, and the other end is hinged to the first adjusting blade assembly and the second adjusting blade assembly respectively. The extension and retraction movement of the electric actuator assembly can drive the first adjusting blade assembly and the second adjusting blade assembly to swing, and the first adjusting blade assembly and the second adjusting blade assembly will not interfere with the movement of the guide plate I and the guide plate II when they swing.

[0009] As a preferred embodiment of this utility model, the swing radial angle range of both the first adjusting blade assembly and the second adjusting blade assembly is 13 to 30°.

[0010] As a preferred embodiment of this utility model, the rotation direction of the first guide plate assembly, the second guide plate assembly, the first adjusting blade assembly, the second adjusting blade assembly, the guide plate I and the guide plate II forms a certain angle with the axis of the first roller cover and the second roller cover.

[0011] As a preferred embodiment of this utility model, the horizontal center distance of the upper cover assembly is greater than the horizontal center distance of the outlines of the left and right axial flow rollers, and is located above the horizontal center distance of the outlines of the left and right axial flow rollers.

[0012] As a preferred technical solution of this utility model, the feeding wheel assembly includes a feeding wheel, a feeding wheel transmission box, a feeding transmission drive wheel, a feeding transmission belt, and a feeding transmission driven wheel; The feeding wheel has a circular roller structure with eight rows of assembled plate teeth evenly distributed around its circumference. Angled convergence guide plates are provided on both sides and in the middle of the feeding wheel. The feed wheel transmission box is connected to the front end of the left axial flow drum. The rotation of the left axial flow drum sequentially drives the feed wheel transmission box, the feed transmission drive wheel, the feed transmission belt, the feed transmission driven wheel, and the feed wheel to rotate.

[0013] As a preferred embodiment of this utility model, the central axis of the feed wheel is perpendicular to the central axes of the left axial flow drum and the right axial flow drum, and the central axis of the feed wheel is lower than the central axes of the left axial flow drum and the right axial flow drum. The gap between the outer diameter of the feed wheel and the feed blades on the left and right axial flow drums is 8-15 mm. The feed wheel speed is automatically controlled proportionally to the speeds of the left and right axial flow drums, always being 65-75% of the speeds of the left and right axial flow drums. The feed speed matches the axial flow speed, ensuring a constant material feed.

[0014] As a preferred embodiment of this utility model, the threshing concave plate gap adjustment device is an electro-hydraulic adjustment structure, the separating concave plate gap adjustment device is a connecting rod structure, and the straw discharge concave plate adopts a comb tooth structure with an adjustable gap with the straw discharge wheel.

[0015] Compared with the prior art, the beneficial effects of this utility model are: (1) By setting a feeding wheel in front of the axial flow drum, and with the unique alternating arrangement of six spiral feeding blades, it helps to quickly grab the material, guide the crop into the threshing drum quickly and effectively, prevent large clumps of crops from entering, reduce the problem of uneven feeding of materials, improve feeding efficiency, reduce unnecessary power consumption, and the speed of the feeding wheel is automatically controlled proportionally to the drum rotation speed to meet the needs of various crop harvesting, with better adaptability; (2) Adopting a unique feeding and threshing separation element arrangement structure, an adjustable threshing concave plate, and a two-stage stepped enlarged stepped drum cover with electro-hydraulic adjustable guide strips, it meets the requirements of smooth crop feeding, uniform threshing, and effective separation under large feeding conditions, significantly improving the grain threshing rate and separation efficiency, with stronger adaptability, lower power consumption, and time-saving and labor-saving adjustment, thereby achieving low-loss and high-efficiency operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the left axial flow drum; Figure 3 A schematic diagram of the cross-sectional arrangement of the spiral blades in the feed section of the left axial flow drum; Figure 4 This is a schematic diagram of the structure of the left axial flow drum threshing unit; Figure 5 This is a schematic diagram of the feed wheel assembly; Figure 6 This is a structural schematic diagram of the upper cover assembly; Figure 7 This is a schematic diagram showing the positional relationship between the upper cover assembly and the left axial flow roller; Figure 8 This is a schematic diagram showing the gap between the feed wheel and the feed blade of the left axial flow drum in the feed wheel assembly.

[0017] In the diagram: 1. Feed wheel assembly, 1-1 Feed wheel, 1-2 Feed wheel transmission box, 1-3 Feed drive drive wheel, 1-4 Feed drive belt, 1-5 Feed drive driven wheel, 2 Feed bottom shell, 3 Left axial flow drum, 3-1 Feed blade I, 3-2 Feed blade II, 3-3 Threshing element, 3-4 Separating element, 3-5 Straight grass discharge plate, 4 Right axial flow drum, 5 Top cover assembly, 5-1 First drum top cover, 5-2 First guide plate assembly, 5-3 Electric push rod assembly, 5-4 First adjusting blade assembly, 5-5 Guide plate I, 5-6 Guide plate II, 5-7 Second drum top cover, 5-8 Second adjusting blade assembly, 5-9 Second guide plate assembly, 6 Threshing concave plate, 7 Separating concave plate, 8 Straw discharge wheel, 9 Drum drive assembly, 10 Straw discharge concave plate, 11 Separating concave plate gap adjustment device, 12 Threshing concave plate gap adjustment device. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments (for ease of description and understanding, hereinafter referred to as...). Figure 1 (The above is described above). Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Please see Figure 1-8 This utility model provides a technical solution: a low-loss and high-efficiency dual longitudinal axial flow threshing and separating device, including a feeding wheel assembly 1, a feeding bottom shell 2, a left axial flow drum 3, a right axial flow drum 4, an upper cover assembly 5, a threshing concave plate 6, a separating concave plate 7, a separating concave plate gap adjustment device 11, a threshing concave plate gap adjustment device 12, a straw discharge wheel 8, a straw discharge concave plate 10, and a drum transmission assembly 9; A top cover assembly 5 is provided above the left axial flow drum 3 and the right axial flow drum 4, and a feeding bottom shell 2, a threshing concave plate 6, and a separation concave plate 7 are respectively provided below the left axial flow drum 3 and the right axial flow drum 4. The threshing concave plate 6 and the separating concave plate 7 are respectively equipped with a threshing concave plate gap adjustment device 12 and a separating concave plate gap adjustment device 11, which can adjust the concave plate gap accordingly. A feeding wheel assembly 1 is provided above the feeding bottom shell 2, and the power input end of the feeding wheel assembly 1 is connected to the front end of the left axial flow roller 3; A roller drive assembly 9 is provided at the rear end of the left axial flow roller 3 and the right axial flow roller 4 to provide rotational power for the left axial flow roller 3 and the right axial flow roller 4; A grass-discharging wheel 8 is provided on the lower rear side of the left axial flow roller 3 and the right axial flow roller 4, and a grass-discharging concave plate 10 is provided below the grass-discharging wheel 8.

[0020] The upper cover assembly 5, the threshing concave plate 6, and the separation concave plate 7 form a closed threshing and separation space. The left axial flow roller 3 and the right axial flow roller 4 are arranged longitudinally inclined within this closed threshing space and their axes are parallel.

[0021] The left axial flow drum 3 and the right axial flow drum 4 are symmetrical in structure. Taking the left axial flow drum 3 as an example, the left axial flow drum 3 includes a feeding section, a threshing section and a separation section in sequence. The feeding section is located at the front end of the threshing section and the separation section is located at the rear end of the threshing section. The feeding section accounts for 1 / 5 of the length of the entire drum, the threshing section accounts for 2 / 5 of the length of the entire drum, and the separation section accounts for 2 / 5 of the length of the entire drum. The feeding section of the left axial flow roller 3 is a conical cylinder structure. Six helical blades are evenly distributed in the circumference of the conical cylinder. There are two types of feeding blades: feeding blade I3-1 and feeding blade II3-2. The three feeding blades I3-1 and the three feeding blades II3-2 are arranged alternately in the circumference of the conical cylinder. The front end of the three feeding blades I3-1 starts at the front end of the feeding section, and the starting point of the three feeding blades II3-2 is located at 1 / 6 of the front end of the feeding section. The feeding blades II3-2 have a gradually increasing structure. The spiral auger blades in the feeding section have an overall conical outer diameter. This alternating arrangement of the feeding blades and the shape of the outer diameter help to quickly grab the material, reduce material unevenness, and ensure that the material can smoothly transition into the threshing section after entering the drum, thus preparing for the subsequent threshing operation. The threshing section of the left axial flow drum 3 is equipped with threshing elements 3-3, which are spirally arranged on the left axial flow drum 3. The threshing elements 3-3 are preferably made of wear-resistant casting rubbing blocks with texture on the top. This texture design can increase the friction with the material and improve the threshing effect. The top texture of the threshing element 3-3 forms an angle K with the axis of the left axial flow drum 3, with a value of 70 to 80°. The rear guide shape of the threshing element 3-3 forms an angle M with the axis of the left axial flow drum 3, with a value of 70 to 80°. The two angle designs ensure that the crop can both achieve the threshing effect and promote the backward flow of material. There is a certain overlap area d between adjacent threshing elements 3-3 arranged in the same spiral, with the value of d being 10-20mm. This avoids gaps between threshing elements that could cause material flow to stagnate, reduces the possibility of agglomeration, and results in stronger and more uniform threshing of the material. The threshing element 3-3 is assembled, which allows for the replacement of different crop threshing elements 3-3 or worn threshing elements; The threshing element 3-3 is arranged in a triple spiral along the feeding blade I3-1, with the inner circle being a closed shaft tube. The triple spiral arrangement allows the threshing unit to have more comprehensive contact with the material, greatly improving the threshing capacity and adapting to threshing operations of different types and moisture levels of grains. The threshing section of the left axial flow drum 3 is equipped with a separation element 3-4. The separation element 3-4 adopts a toothed structure. The arrangement of the toothed structure is a triple helix with the threshing element 3-3. The toothed structure is tilted backward at a certain angle and the top is rounded. The triple helix arrangement and tilting design make the toothed structure more guiding and increase centrifugal force when separating materials. It can effectively separate grains from straw. The rounded corner design is conducive to material damage and reduces power consumption. The end of the toothed structure is equipped with a straw discharge straight plate 3-5 to make the crop discharge smoother.

[0022] The direction of rotation of the feeding blades, the threshing elements, and the separation unit on the right axial flow drum 4 are opposite to those on the left axial flow drum 3, and will not be repeated here.

[0023] The feed wheel assembly 1 includes a feed wheel 1-1, a feed wheel transmission box 1-2, a feed transmission drive wheel 1-3, a feed transmission belt 1-4, and a feed transmission driven wheel 1-5; The feed wheel 1-1 has a circular roller structure with eight rows of assembled toothed plates evenly distributed around the circumference. The toothed plates are made of special wear-resistant materials, which can effectively extend the service life of the device. The feed roller 1-1 is equipped with angled converging guide plates on both sides and in the middle, which allows the material to enter the roller more concentratedly and improves the feeding efficiency. The central axis of the feed wheel 1-1 is perpendicular to the central axes of the left axial flow roller 3 and the right axial flow roller 4, and the central axis of the feed wheel 1-1 is lower than the central axis of the left axial flow roller 3 and the right axial flow roller 4. The gap f between the outer diameter of the feed roller 1-1 and the feed blades on the left axial flow roller 3 and the right axial flow roller 4 is 8-15mm, which is conducive to smooth material feeding. The feed wheel drive box 1-2 is connected to the front end of the left axial flow drum 3. The rotation of the left axial flow drum 3 sequentially drives the feed wheel drive box 1-2, the feed drive drive wheel 1-3, the feed drive belt 1-4, the feed drive driven wheel 1-5, and the feed wheel 1-1 to rotate. The speed of the feed wheel 1-1 is automatically controlled proportionally to the speed of the left axial flow drum 3 and the right axial flow drum 4, and is always 65-75% of the speed of the left axial flow drum 3 and the right axial flow drum 4. The feeding speed matches the axial flow speed to ensure constant material feeding, maintain the integrity of the straw to the greatest extent, and minimize power consumption.

[0024] The roller drive assembly 9 drives the left axial flow roller 3 and the right axial flow roller 4 to rotate inwards, and the phase angle G of the feeding section blades differs by 60°. This phase angle difference is conducive to the feeding blades gripping the material more evenly. The roller drive assembly 9 is equipped with multiple speed settings for speed adjustment, with a speed range of 300 to 1250 r / min, which meets the speed requirements for harvesting various crops and has stronger adaptability.

[0025] The left axial flow drum 3 and the right axial flow drum 4 are inclined in the middle of the harvester, and their central axis is inclined at an angle C to the horizontal, with the value of angle C being 3 to 12°.

[0026] The upper cover assembly 5 includes a first roller upper cover 5-1, a second roller upper cover 5-7, an electric push rod assembly 5-3, a first guide plate assembly 5-2, a second guide plate assembly 5-9, a first adjusting blade assembly 5-4, a second adjusting blade assembly 5-8, a guide plate I 5-5, and a guide plate II 5-6; The first roller cover 5-1 and the second roller cover 5-7 are fixedly connected. The radius of the first roller cover 5-1 is smaller than the radius of the second roller cover 5-7 and their axes coincide, forming a two-stage stepped enlarged structure. The first guide plate assembly 5-2 and the second guide plate assembly 5-9 are symmetrically fixed inside the first roller cover 5-1. The first adjusting blade assembly 5-4 and the second adjusting blade assembly 5-8 are symmetrically hinged inside the second roller cover 5-7. The guide plate I 5-5 and the guide plate II 5-6 are symmetrically fixed at the rear ends of the first adjusting blade assembly 5-4 and the second adjusting blade assembly 5-8 inside the second roller cover 5-7. One end of the electric actuator assembly 5-3 is fixedly mounted on the outer side of the upper part of the first upper cover plate, and the other end is hinged to the first adjusting vane assembly 5-4 and the second adjusting vane assembly 5-8 respectively. The extension and retraction movement of the electric actuator assembly 5-3 can drive the first adjusting vane assembly 5-4 and the second adjusting vane assembly 5-8 to swing, and the first adjusting vane assembly 5-4 and the second adjusting vane assembly 5-8 will not interfere with the movement of the guide plate I5-5 and the guide plate II5-6 when they swing.

[0027] The swing radial angle range of the first adjusting blade assembly 5-4 and the second adjusting blade assembly 5-8 is 13 to 30°, which can meet the harvesting needs of different crops and reduce crop separation loss. The rotation direction of the first guide plate assembly 5-2, the second guide plate assembly 5-9, the first adjusting blade assembly 5-4, the second adjusting blade assembly 5-8, the guide plate I 5-5, and the guide plate II 5-6 forms a certain angle with the axis of the first roller cover 5-1 and the second roller cover 5-7, and is in the direction of material flow, which is conducive to the crop moving along the roller axis towards the tail end of the axial flow roller under the action of the guide plate.

[0028] The horizontal center distance a of the upper cover assembly 5 is greater than the horizontal center distance b of the outlines of the left axial flow roller 3 and the right axial flow roller 4, and is located above the horizontal center distance of the outlines of the left axial flow roller 3 and the right axial flow roller 4, which is conducive to the uniform lateral distribution of the threshed and separated material.

[0029] The threshing concave plate 6 and the separating concave plate 7 are located directly below the threshing section and separating section of the left axial flow drum 3 and the right axial flow drum 4, respectively. The threshing concave plate 6 can be easily replaced, and the structure is compact, which can meet the needs of multiple crop harvesting.

[0030] The threshing concave plate gap adjustment device 12 is an electro-hydraulic adjustment structure, which is convenient to operate, saves time and effort, adapts to the threshing gap required for different harvesting conditions, reduces losses, and improves harvesting efficiency.

[0031] The separation concave plate gap adjustment device 11 has a linkage structure, which is simple to operate, adapts to the separation gap required for harvesting under different conditions, reduces losses, and has a wider range of adaptability.

[0032] The grass-removing concave plate 10 adopts a comb-tooth structure and the gap between it and the grass-removing wheel 8 is adjustable to prevent grass from getting tangled, facilitate separation, and improve the service life of the grass-removing concave plate.

[0033] The parts of the utility model not described in detail are prior art. Although embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A low-loss, high-efficiency dual longitudinal axial flow threshing and separation device, characterized in that: Includes a feeding wheel assembly (1), a feeding bottom shell (2), a left axial flow roller (3), a right axial flow roller (4), an upper cover assembly (5), a threshing concave plate (6), a separating concave plate (7), a separating concave plate gap adjustment device (11), a threshing concave plate gap adjustment device (12), a straw discharge wheel (8), a straw discharge concave plate (10), and a roller drive assembly (9); The left axial flow drum (3) and the right axial flow drum (4) are provided with an upper cover assembly (5), and the left axial flow drum (3) and the right axial flow drum (4) are respectively provided with a feeding bottom shell (2), a threshing concave plate (6) and a separation concave plate (7) below them. The threshing concave plate (6) and the separating concave plate (7) are respectively provided with a threshing concave plate gap adjustment device (12) and a separating concave plate gap adjustment device (11), which can adjust the concave plate gap accordingly; A feeding wheel assembly (1) is provided above the feeding bottom shell (2), and the power input end of the feeding wheel assembly (1) is connected to the front end of the left axial flow roller (3); The left axial flow roller (3) and the right axial flow roller (4) are provided with roller drive assembly (9) at their rear ends to provide rotational power for the left axial flow roller (3) and the right axial flow roller (4); The left axial flow roller (3) and the right axial flow roller (4) are provided with a grass-removing wheel (8) at the lower rear side, and a grass-removing concave plate (10) is provided below the grass-removing wheel (8).

2. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 1, characterized in that: The upper cover assembly (5), the threshing concave plate (6), and the separation concave plate (7) form a closed threshing and separation space. The left axial flow roller (3) and the right axial flow roller (4) are arranged longitudinally inclined within the closed threshing and separation space and their axes are parallel.

3. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 1, characterized in that: The left axial flow drum (3) and the right axial flow drum (4) are symmetrical in structure. The left axial flow drum (3) includes a feeding section, a threshing section and a separation section in sequence. The feeding section is located at the front end of the threshing section and the separation section is located at the rear end of the threshing section. The feeding section occupies 1 / 5 of the total drum length, the threshing section occupies 2 / 5 of the total drum length, and the separation section occupies 2 / 5 of the total drum length. The feeding section of the left axial flow roller (3) is a conical cylinder structure. Six spiral blades are evenly distributed in the circumferential direction of the conical cylinder. They are feeding blade I (3-1) and feeding blade II (3-2). The three feeding blades I (3-1) and the three feeding blades II (3-2) are arranged alternately in the circumferential direction of the conical cylinder. The front end of the three feeding blades I (3-1) starts at the front end of the feeding section, and the starting point of the three feeding blades II (3-2) is located at 1 / 6 of the front end of the feeding section. The feeding blades II (3-2) have a gradually increasing structure. The roller transmission assembly (9) drives the left axial flow roller (3) and the right axial flow roller (4) to rotate inwards. The phase angle difference between the blades in the feeding section is 60°. The threshing section of the left axial flow drum (3) is provided with threshing elements (3-3). The threshing elements (3-3) are spirally arranged on the left axial flow drum (3). The threshing elements (3-3) are arranged in a triple spiral along the feed blade I (3-1). The inner circle is a closed shaft tube. There is a certain overlap area between adjacent threshing elements (3-3) arranged in the same spiral. The top texture of the threshing element (3-3) has an angle with the axis of the left axial flow drum (3). The rear guide shape of the threshing element (3-3) has an angle with the axis of the left axial flow drum (3). The threshing section of the left axial flow drum (3) is provided with a separation element (3-4). The separation element (3-4) adopts a toothed structure. The arrangement of the toothed structure is a triple spiral with the threshing element (3-3). The toothed structure is tilted backward at a certain angle and the top is rounded. The end of the toothed structure is provided with a straw discharge straight plate (3-5).

4. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 1, characterized in that: The upper cover assembly (5) includes a first roller upper cover (5-1), a second roller upper cover (5-7), an electric actuator assembly (5-3), a first guide plate assembly (5-2), a second guide plate assembly (5-9), a first adjusting blade assembly (5-4), a second adjusting blade assembly (5-8), guide plate I (5-5), and guide plate II (5-6). The first roller cover (5-1) and the second roller cover (5-7) are fixedly connected. The radius of the first roller cover (5-1) is smaller than that of the second roller cover (5-7) and their axes coincide, forming a two-stage stepped enlarged structure. The first guide plate assembly (5-2) and the second guide plate assembly (5-9) are symmetrically fixed inside the first roller cover (5-1). The first adjusting blade assembly (5-4) and the second adjusting blade assembly (5-8) are symmetrically hinged inside the second roller cover (5-7). The guide plate I (5-5) and the guide plate II (5-6) are symmetrically fixed at the rear ends of the first adjusting blade assembly (5-4) and the second adjusting blade assembly (5-8) inside the second roller cover (5-7). One end of the electric actuator assembly (5-3) is fixedly disposed on the outer side of the upper part of the first upper cover plate, and the other end is hinged to the first adjusting blade assembly (5-4) and the second adjusting blade assembly (5-8) respectively. The telescopic movement of the electric actuator assembly (5-3) can drive the first adjusting blade assembly (5-4) and the second adjusting blade assembly (5-8) to swing, and the first adjusting blade assembly (5-4) and the second adjusting blade assembly (5-8) will not interfere with the movement of the guide plate I (5-5) and the guide plate II (5-6) when they swing.

5. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 4, characterized in that: The swing radial angle range of the first adjusting blade assembly (5-4) and the second adjusting blade assembly (5-8) is 13 to 30°.

6. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 4, characterized in that: The rotation direction of the first guide plate assembly (5-2), the second guide plate assembly (5-9), the first adjusting blade assembly (5-4), the second adjusting blade assembly (5-8), the guide plate I (5-5), and the guide plate II (5-6) forms a certain angle with the axis of the first roller cover (5-1) and the second roller cover (5-7).

7. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 4, characterized in that: The horizontal center distance of the upper cover assembly (5) is greater than the horizontal center distance of the outlines of the left axial flow roller (3) and the right axial flow roller (4), and is located above the horizontal center distance of the outlines of the left axial flow roller (3) and the right axial flow roller (4).

8. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 1, characterized in that: The feed wheel assembly (1) includes a feed wheel (1-1), a feed wheel transmission box (1-2), a feed transmission drive wheel (1-3), a feed transmission belt (1-4), and a feed transmission driven wheel (1-5). The feeding wheel (1-1) has a circular roller structure with eight rows of assembled plate teeth evenly distributed around its circumference. The feeding wheel (1-1) is provided with angled convergence guide plates on both sides and in the middle. The feed wheel transmission box (1-2) is connected to the front end of the left axial flow roller (3). The rotation of the left axial flow roller (3) sequentially drives the feed wheel transmission box (1-2), the feed transmission drive wheel (1-3), the feed transmission belt (1-4), the feed transmission driven wheel (1-5), and the feed wheel (1-1) to rotate.

9. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 8, characterized in that: The central axis of the feed wheel (1-1) is perpendicular to the central axes of the left axial flow roller (3) and the right axial flow roller (4), and the central axis of the feed wheel (1-1) is lower than the central axes of the left axial flow roller (3) and the right axial flow roller (4); The gap between the outer diameter of the feed wheel (1-1) and the feed blades on the left axial flow drum (3) and the right axial flow drum (4) is 8-15 mm; The speed of the feed wheel (1-1) is automatically controlled in proportion to the speed of the left axial flow drum (3) and the right axial flow drum (4), and is always 65-75% of the speed of the left axial flow drum (3) and the right axial flow drum (4). The feed speed matches the axial flow speed to ensure constant material feeding.

10. The low-loss, high-efficiency dual longitudinal axial flow threshing and separation device according to claim 1, characterized in that: The threshing concave plate gap adjustment device (12) is an electro-hydraulic adjustment structure, the separation concave plate gap adjustment device (11) is a connecting rod structure, the grass discharge concave plate (10) adopts a comb tooth structure, and the gap between it and the grass discharge wheel (8) is adjustable.

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