Double-helix chopper
By designing a double helix chopper in the wheat harvester's chopper, the problem of poor grass discharge and blockage of the double-longitudinal axial flow wheat harvester chopper is solved, achieving more efficient harvesting and more uniform chopping effect.
Patent Information
- Application Number
- CN202421618452.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The chopper of the double-longitudinal axial flow wheat harvester has shortcomings in the problems of poor grass discharge and blockage, which affects the harvest performance of the whole machine.
A double helix chopper is designed. The rotating sleeve and multiple blades are arranged in the assembly of the movable knife shaft. The blades are spiraled toward both ends and form a two-section spiral structure, which is suitable for the characteristics of a double longitudinal roller harvester.
Through the design of the double helix chopper, the grass assembly of the movable knife shaft is smoother, avoiding clogging of the chopper, improving the harvesting efficiency and chopping effect of the harvester, reducing the chopping power and vibration, and extending the service life.
Smart Images
Figure CN222897652U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of wheat harvesters, in particular to a double - helix cutter. Background Technique
[0002] At present, with the rapid development and application of wheat harvesting machinery, wheat harvesting machinery is developing from the original single - longitudinal - axis drum to the double - longitudinal - axis drum. The reasons for the rapid development of wheat harvesters of the double - longitudinal - axis drum type are mainly the high operation efficiency, flexible transfer, and small threshing loss of the harvester. However, while there are advantages, there are also some factors that affect the performance improvement of double - longitudinal - axis wheat harvesters, such as the problem of poor straw discharge of the cutter of the harvester.
[0003] At present, the assembly of the moving knife shaft in the cutter equipped with wheat double - longitudinal - axis harvesting machinery is mainly divided into single - helix type and linear arrangement. The single - helix form mainly refers to the arrangement of the blades on the moving knife shaft in a spiral line; the linear type mainly refers to the arrangement of the blades on the moving knife shaft in a straight - line form. These two types of cutters perform well in single - longitudinal - axis drum harvesters, but perform poorly in double - longitudinal - axis drum harvesters, often resulting in straw jams and poor straw discharge, seriously affecting the harvesting performance of the whole machine. To improve the performance of the whole vehicle, the cutter structure should be changed to optimize the performance of the whole vehicle. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is: to provide a double - helix cutter to solve the above problems.
[0005] The technical solution of the utility model to solve the above - mentioned technical problem is as follows: a double - helix cutter, comprising: a moving knife shaft assembly, a fixed knife assembly, a cutter body, and two guide shells; the moving knife shaft assembly rotatably passes through the cutter body, the fixed knife assembly is arranged below the moving knife shaft assembly and is respectively connected to the inner walls at both ends of the cutter body at both ends, the two guide shells are respectively arranged on the outer walls at both ends of the cutter body and are respectively arranged below both ends of the moving knife shaft assembly; a rotating sleeve and a plurality of blades are arranged in the moving knife shaft assembly, the plurality of blades are wound around the circumferential surface of the rotating sleeve, and the plurality of blades are spirally wound starting from the center of the rotating sleeve towards both ends of the rotating sleeve.
[0006] The beneficial effects of the present utility model are as follows: Multiple blades are spirally wound from the center of the rotating sleeve towards both ends of the rotating sleeve, which is conducive to forming two spiral structures on the circumferential surface of the moving knife shaft assembly, thereby adapting to the characteristics of a double longitudinal axis drum harvester, that is, discharging the straw from the middle position of the moving knife shaft assembly towards both ends to the left and right sides of the shredder respectively. In this way, the straw discharge of the moving knife shaft assembly can be made smoother, avoiding blockage of the shredder, improving the harvesting efficiency of the harvester; it can also make the shredding effect of the shredder more uniform, reducing the shredding power of the shredder; and it can also reduce the vibration effect of the shredder and improve the service life of shredding.
[0007] On the basis of the above technical solution, the present utility model can also be improved as follows.
[0008] Further, multiple said blades are evenly divided into multiple knife rings, and multiple said knife rings are arranged in a staggered manner with respect to each other, forming a spiral structure starting from the center of the rotating sleeve and extending towards both ends of the rotating sleeve.
[0009] The beneficial effect of adopting the above further solution is: It is conducive to winding multiple blades in a single knife ring around the circumferential surface of the rotating sleeve, and at the same time, multiple knife rings are arranged in a staggered manner with respect to each other, so that a spiral structure can be formed.
[0010] Further, the two spiral structures formed by multiple said knife rings are arranged in a staggered manner.
[0011] The beneficial effect of adopting the above further solution is: It is conducive to preventing the two spiral structures from connecting at the center point of the rotating sleeve to form a complete spiral structure, that is, making the spiral directions of the two spiral structures different, so as to adapt to the characteristics of the double longitudinal axis drum harvester and avoid the straw moving only towards one end from the middle position of the moving knife shaft assembly.
[0012] Further, the fixed knife assembly includes a fixed knife bracket and multiple U-shaped fixed knives. The U-shaped fixed knives are fixedly installed on the fixed knife bracket, and both ends of the fixed knife bracket are respectively connected to the inner walls at both ends of the shredder body. Multiple said U-shaped fixed knives respectively correspond to multiple said knife rings to realize the shearing of the straw.
[0013] The beneficial effect of adopting the above further solution is: The U-shaped fixed knife is conducive to forming a structure for shearing the straw with the knife ring on it after the moving knife shaft assembly rotates, so as to achieve the purpose of shredding the straw.
[0014] Further, angle adjustment holes are provided at both ends of the shredder body. The angle adjustment holes are in a strip structure, and both ends of the fixed knife bracket are respectively connected to different positions of the two angle adjustment holes to realize the adjustment of the attitude of the fixed knife assembly.
[0015] The beneficial effects of adopting the above further scheme are as follows: By fixing the stationary knife support at different positions of the angle adjustment holes, it is beneficial to adjust the posture of the U-shaped stationary knife installed on the stationary knife support, so as to be adapted to the knife ring on the moving knife shaft assembly to form a shear on the straw.
[0016] Furthermore, the moving knife shaft assembly further includes a moving knife shaft and a plurality of blade fixing blocks; the rotating sleeve is sleeved on the moving knife shaft in a fitting manner, and the plurality of blades are respectively fixed on the circumferential surface of the rotating sleeve through the plurality of blade fixing blocks. The rotating sleeve is arranged inside the shredder body, and the moving knife shaft passes through the shredder body.
[0017] The beneficial effects of adopting the above further scheme are as follows: The rotation of the moving knife shaft is beneficial to drive the rotation of the rotating sleeve and the plurality of blades installed on the rotating sleeve, so as to cooperate with the stationary knife assembly to realize the shear of the straw; the blade fixing blocks are beneficial to installing blades of different types or sizes on the rotating sleeve, so as to shear different types of straw.
[0018] Furthermore, it further includes a pulley, the pulley is sleeved on the moving knife shaft in a fitting manner, the pulley is arranged outside the shredder body and is connected to an external power mechanism to drive the rotation of the moving knife shaft assembly.
[0019] The beneficial effects of adopting the above further scheme are as follows: The connection between the pulley and the external power mechanism is beneficial to converting the power of the external power mechanism into the rotation of the moving knife shaft, and then driving the blades to rotate and cut the straw.
[0020] Furthermore, the guide housing is inclined, and the top end is arranged below the end of the rotating sleeve to discharge the straw sheared by the spiral blades.
[0021] The beneficial effects of adopting the above further scheme are as follows: The inclined guide housing is beneficial to guiding the straw discharged after being sheared by the spiral blades, and avoiding the interference of the sheared straw on the operation of the device.
[0022] Furthermore, it further includes a double longitudinal axial flow cylinder, the double longitudinal axial flow cylinder is installed above the midpoint of the moving knife shaft assembly, and conveys the threshed straw from the midpoint of the moving knife shaft assembly into the moving knife shaft assembly.
[0023] The beneficial effects of adopting the above further scheme are as follows: The double longitudinal axial flow cylinder is beneficial to conveying the threshed straw from the middle position of the moving knife shaft assembly into the spiral structure formed by the plurality of blades, so that the blades cut the straw and discharge it to the left and right sides of the shredder at both ends, so as to make the straw discharge more smoothly and avoid blockage.
[0024] Furthermore, it further includes a threshing body, which is connected to the chopper body, threshes the harvested wheat, and conveys the threshed wheat straw to the double longitudinal axial flow drum.
[0025] The beneficial effect of adopting the above further solution is that the threshing body is beneficial to threshing the harvested wheat, facilitating the subsequent chopping of the straw. Description of the Drawings
[0026] Figure 1 It is the front view of the overall structure provided by the embodiment of the present invention;
[0027] Figure 2 It is the left view of the overall structure provided by the embodiment of the present invention;
[0028] Figure 3 It is the right view of the overall structure provided by the embodiment of the present invention;
[0029] Figure 4 It is the axonometric view of the moving knife shaft assembly provided by the embodiment of the present invention;
[0030] Figure 5 It is the front view of the moving knife shaft assembly provided by the embodiment of the present invention;
[0031] Figure 6 It is the connection schematic diagram between the double spiral chopper, the double longitudinal axial flow drum and the threshing body provided by the embodiment of the present invention.
[0032] In the drawings, the list of components represented by each reference numeral is as follows:
[0033] 1. Moving knife shaft assembly; 2. Fixed knife assembly; 3. Chopper body; 4. Diversion housing; 5. Pulley; 6. Double longitudinal axial flow drum; 7. Threshing body; 11. Moving knife shaft; 12. Rotating sleeve; 13. Blade fixing block; 14. Blade; 15. Knife ring; 21. Fixed knife bracket; 22. U-shaped fixed knife; 31. Angle adjustment hole. Detailed Embodiment
[0034] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.
[0035] As Figures 1 to 5As shown in the figure, a double - helix shredder includes: a moving knife - shaft assembly 1, a fixed - knife assembly 2, a shredder body 3, and two diversion housings 4; the moving knife - shaft assembly 1 rotatably passes through the shredder body 3, the fixed - knife assembly 2 is arranged below the moving knife - shaft assembly 1, and both ends are respectively connected to the inner walls at both ends of the shredder body 3. The two diversion housings 4 are respectively arranged on the outer walls at both ends of the shredder body 3, and are respectively arranged below both ends of the moving knife - shaft assembly 1; a rotating sleeve 12 and a plurality of blades 14 are arranged in the moving knife - shaft assembly 1. The plurality of blades 14 are wound around the circumferential surface of the rotating sleeve 12. Starting from the center of the rotating sleeve 12, the plurality of blades 14 are spirally wound towards both ends of the rotating sleeve 12.
[0036] Among them, it should be noted that: in the technical solution of the present invention, although the two spiral - shaped structures formed by the plurality of blades 14 start from the center of the rotating sleeve 12 and extend towards both ends of the rotating sleeve 12, these two spiral - shaped structures cannot be connected at the center point of the rotating sleeve 12 to form a complete spiral - shaped structure. That is to say, these two spiral - shaped structures can only be spiral - shaped structures at different angles.
[0037] The beneficial effects of the present invention are as follows: The plurality of blades are spirally wound starting from the center of the rotating sleeve and towards both ends of the rotating sleeve, which is conducive to forming two spiral - shaped structures on the circumferential surface of the moving knife - shaft assembly, and then adapting to the characteristics of a double - longitudinal - axis drum harvester, that is, discharging the straw from the middle position of the moving knife - shaft assembly towards both ends to the left and right sides of the shredder. In this way, the straw discharge of the moving knife - shaft assembly can be made smoother, avoiding blockage of the shredder, improving the harvesting efficiency of the harvester; it can also make the shredding effect of the shredder more uniform, reducing the shredding power of the shredder; and it can also reduce the vibration effect of the shredder and improve the service life of shredding.
[0038] Preferably, as Figure 4 shown, the plurality of blades 14 are evenly divided into a plurality of knife rings 15. The plurality of knife rings 15 are arranged in a staggered manner with each other, forming a spiral - shaped structure starting from the center of the rotating sleeve 12 and extending towards both ends of the rotating sleeve 12.
[0039] The beneficial effect of adopting the above - mentioned preferred solution is: It is conducive to winding the plurality of blades in a single knife ring around the circumferential surface of the rotating sleeve. At the same time, the plurality of knife rings are arranged in a staggered manner with each other, and a spiral - shaped structure can be formed.
[0040] Preferably, as Figure 4 shown, the two spiral - shaped structures formed by the plurality of knife rings 15 are arranged in a staggered manner.
[0041] The beneficial effects of adopting the above preferred solution are as follows: It is beneficial to avoid the connection of the two spiral structures at the center point of the rotating sleeve to form a complete spiral structure, that is, to make the spiral directions of the two end spiral structures different, so as to adapt to the characteristics of the double longitudinal axis drum harvester and avoid the straw moving only towards one end at the middle position of the driven knife shaft assembly.
[0042] Preferably, as Figure 1 shown, the fixed knife assembly 2 includes a fixed knife bracket 21 and a plurality of U-shaped fixed knives 22. The U-shaped fixed knives 22 are fixedly installed on the fixed knife bracket 21. The two ends of the fixed knife bracket 21 are respectively connected to the inner walls at both ends of the chopper body 3. The plurality of U-shaped fixed knives 22 respectively correspond to the plurality of knife rings 15 to realize the shearing of the straw.
[0043] The beneficial effects of adopting the above preferred solution are as follows: The U-shaped fixed knife is beneficial to form a structure for shearing the straw with the knife ring on it after the moving knife shaft assembly rotates, so as to achieve the purpose of chopping the straw.
[0044] Preferably, as Figure 3 shown, angle adjustment holes 31 are provided at both ends of the chopper body 3. The angle adjustment holes 31 are of strip-shaped structure. The two ends of the fixed knife bracket 21 are respectively connected to different positions of the two angle adjustment holes 31 to realize the adjustment of the posture of the fixed knife assembly 2.
[0045] The beneficial effects of adopting the above preferred solution are as follows: By fixing the fixed knife bracket at different positions of the angle adjustment hole, it is beneficial to adjust the posture of the U-shaped fixed knife installed on the fixed knife bracket, so as to adapt to the knife ring on the moving knife shaft assembly to form a shear for the straw.
[0046] Preferably, as Figure 4 and Figure 5 shown, the moving knife shaft assembly 1 further includes a moving knife shaft 11 and a plurality of blade fixing blocks 13; the rotating sleeve 12 is sleeved on the moving knife shaft 11 in a matching manner. The plurality of blades 14 are respectively fixed on the circumferential surface of the rotating sleeve 12 through the plurality of blade fixing blocks 13. The rotating sleeve 12 is arranged inside the chopper body 3, and the moving knife shaft 11 passes through the chopper body 3.
[0047] Among them, it should be noted that: in the preferred embodiment of the present invention, the form of the blade 14 is a movable throwing knife type.
[0048] The beneficial effects of adopting the above preferred solution are as follows: The rotation of the moving knife shaft is beneficial to drive the rotation of the rotating sleeve and the plurality of blades installed on the rotating sleeve, so as to cooperate with the fixed knife assembly to realize the shearing of the straw; the blade fixing block is beneficial to install different types or sizes of blades on the rotating sleeve, so as to shear different types of straw.
[0049] Preferably, as Figure 1 and Figure 2 shown, it further includes a pulley 5, the pulley 5 is adaptively sleeved on the moving knife shaft 11, the pulley 5 is arranged outside the shredder body 3 and is connected to an external power mechanism to drive the rotation of the moving knife shaft assembly 1.
[0050] The beneficial effect of adopting the above preferred solution is that the pulley is connected to the external power mechanism, which is beneficial to converting the power of the external power mechanism into the rotation of the moving knife shaft, and then driving the blade to rotate to cut the straw.
[0051] Preferably, as Figures 1 to 3 shown, the diversion housing 4 is inclined, and the top end is arranged below the end of the rotating sleeve 12 to discharge the straw sheared by the spiral blade 14.
[0052] It should be noted that: in the preferred embodiment of the present invention, a transmission belt or a transmission chain can be arranged at the top end of the diversion housing 4, which is more beneficial to the transfer and diversion of the sheared straw.
[0053] The beneficial effect of adopting the above preferred solution is that the inclined diversion housing is beneficial to guiding the straw discharged after being sheared by the spiral blade, and avoiding the interference of the sheared straw on the operation of the device.
[0054] Preferably, as Figure 6 shown, it further includes a double longitudinal axial flow drum 6, the double longitudinal axial flow drum 6 is installed above the midpoint of the moving knife shaft assembly 1, and conveys the threshed straw from the midpoint of the moving knife shaft assembly 1 into the moving knife shaft assembly 1.
[0055] The beneficial effect of adopting the above preferred solution is that the double longitudinal axial flow drum is beneficial to conveying the threshed straw from the middle position of the moving knife shaft assembly into the spiral structure formed by multiple blades, so that the blades cut the straw and discharge it to the left and right sides of the shredder at both ends, making the straw discharge smoother and avoiding blockage.
[0056] Preferably, as Figure 6 shown, it further includes a threshing body 7, the threshing body 7 is connected to the shredder body 3, threshes the harvested wheat, and conveys the threshed wheat straw into the double longitudinal axial flow drum 6.
[0057] The beneficial effect of adopting the above preferred solution is that the threshing body is beneficial to threshing the harvested wheat, facilitating the subsequent shredding of the straw.
[0058] The working process of the present invention will be described below through an embodiment:
[0059] As Figures 1 to 6 shown, after the harvester harvests wheat from the field, the wheat is first threshed by the threshing body 7 to separate the wheat grains from the straw. Then, the double longitudinal axial flow roller 6 conveys the wheat straw from the middle of the moving knife shaft assembly 1 to the moving knife shaft assembly 1. During this process, the external power mechanism drives the rotation of the moving knife shaft 11 through the pulley 5, and then makes the multiple blades 14 rotate. The rotating blades 14 cooperate with the U-shaped fixed knife 22 to cut the straw, cut the complete straw into pieces, and take the middle of the moving knife shaft assembly 1 as the starting point and the two spiral structures formed by the multiple knife rings 15 as the guide to convey the cut straw to the diversion shells 4 at both ends of the moving knife shaft assembly 1.
[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.
[0061] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0062] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0063] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.
[0064] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0065] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
Claims
1. A double spiral chopper, characterized in that: include: A movable blade shaft assembly (1), a fixed blade assembly (2), a chopper body (3) and two flow guide housings (4); the movable blade shaft assembly (1) rotatably passes through the chopper body (3); the fixed blade assembly (2) is arranged below the movable blade shaft assembly (1) and its two ends are respectively connected to the inner walls of the chopper body (3); the two flow guide housings (4) are respectively arranged on the outer walls of the chopper body (3) and are respectively arranged below the two ends of the movable blade shaft assembly (1); The movable knife shaft assembly (1) is provided with a rotating sleeve (12) and a plurality of blades (14). The plurality of blades (14) are arranged around the circumference of the rotating sleeve (12). The plurality of blades (14) are arranged in a spiral shape towards two ends of the rotating sleeve (12) starting from the center of the rotating sleeve (12).
2. A double spiral chopper according to claim 1, characterized in that: The plurality of blades (14) are divided into a plurality of knife rings (15), and the plurality of knife rings (15) are arranged in a staggered manner to form a spiral structure starting from the center of the rotating sleeve (12) and extending toward both ends of the rotating sleeve (12).
3. A double spiral chopper according to claim 2, characterized in that: The two sections of spiral structures formed by the plurality of knife rings (15) are staggered.
4. A double spiral chopper according to claim 2, characterized in that: The fixed knife assembly (2) comprises a fixed knife support (21) and a plurality of U-shaped fixed knives (22); the U-shaped fixed knives (22) are fixedly mounted on the fixed knife support (21); two ends of the fixed knife support (21) are respectively connected to the inner walls of two ends of the chopper body (3); the plurality of U-shaped fixed knives (22) respectively correspond to the plurality of knife rings (15) to achieve shearing of straw.
5. A double spiral chopper according to claim 4, characterized in that: Both ends of the chopper body (3) are provided with angle adjustment holes (31), the angle adjustment holes (31) are strip-shaped structures, and the two ends of the fixed knife bracket (21) are respectively connected to different positions of the two angle adjustment holes (31) to achieve adjustment of the posture of the fixed knife assembly (2).
6. A double spiral chopper according to claim 1, characterized in that: The movable blade shaft assembly (1) further comprises a movable blade shaft (11) and a plurality of blade fixing blocks (13); the rotating sleeve (12) is adaptively mounted on the movable blade shaft (11); the plurality of blades (14) are respectively fixed on the circumferential surface of the rotating sleeve (12) via the plurality of blade fixing blocks (13); the rotating sleeve (12) is arranged inside the chopper body (3); and the movable blade shaft (11) passes through the chopper body (3).
7. A double spiral chopper according to claim 6, characterized in that: It also comprises a pulley (5), wherein the pulley (5) is adapted to be mounted on the movable blade shaft (11), the pulley (5) is arranged outside the chopper body (3) and is connected to an external power mechanism to drive the movable blade shaft assembly (1) to rotate.
8. A double spiral chopper according to claim 1, characterized in that: The flow guide housing (4) is arranged obliquely, and the top end is arranged below the end of the rotating sleeve (12), so as to discharge the straw cut by the spiral blade (14).
9. A double spiral chopper according to claim 1, characterized in that: It also includes a double longitudinal axial flow roller (6), which is installed above the midpoint of the movable blade shaft assembly (1) to transport the threshed straw from the midpoint of the movable blade shaft assembly (1) into the movable blade shaft assembly (1).
10. A double spiral chopper according to claim 9, characterized in that: It also comprises a threshing machine body (7), which is connected to the chopper body (3) to thresh the harvested wheat and transport the threshed wheat straw to the double longitudinal axial flow drum (6).