Double spiral threshing and conveying system and combine harvester

Abstract

The present invention provides a double-spiral threshing and conveying system and a combine harvester, comprising two threshing spaces arranged horizontally and spaced apart in the front and back directions of the harvester, the threshing spaces being hollow cylindrical mounting cavities surrounded by a concave plate screen and a cylinder cover, and a roller being installed in each mounting cavity. Guide members are arranged at intervals on the inner wall surface of the cylinder cover to guide the crops entering the threshing space to move in a directional manner around the axis, the rotation of the cylinder drives the crops to move, and the crops are guided by the guide members to enter the second threshing space from the first threshing space, the working areas of the two threshing spaces are the same length, therefore, the threshing path of the crops passes through the length of the two rollers, and the threshing can be fully performed. The two threshing spaces are arranged horizontally at intervals, so that the structure on the frame is more compact, the lengths of the two threshing working areas are the same, and a sufficiently long threshing path can be ensured, so that the threshing effect is fully guaranteed while ensuring the overall mobility of the harvester.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to a double-screw threshing and conveying system and a combine harvester. Background Art

[0002] The threshing system of crawler combine harvesters can be divided into longitudinal axial flow threshing and cleaning system and transverse axial flow threshing and cleaning system. These two types of threshing and cleaning systems are the main structural forms currently used in the market.

[0003] The longitudinal axial flow drum is longer, which allows the crops time to be fully threshed and separated inside the drum. However, if the length is too long, the entire machine will inevitably be longer, and the machine will not be flexible enough when operating or turning, and the structure will not be compact enough.

[0004] The horizontal axial flow drum mainly includes a single-drum horizontal axial flow threshing system and a 1.5-drum horizontal axial flow threshing system. Although its layout on the harvester is shorter than the overall length of the longitudinal axial flow, its drum stroke is shorter, and the threshing stroke is less than half of the longitudinal axial flow. When encountering difficult-to-thresh varieties, such a short drum cannot allow the crops to have sufficient time to be threshed in the drum, and finally some of the fed crops are discharged from the machine body before they can be threshed, and the crop loss becomes greater. This kind of horizontal axial flow drum structure can make the whole machine compact and flexible in operation, but it may not guarantee a good threshing effect of the crops. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the harvester threshing system in the prior art cannot simultaneously meet the overall maneuverability and threshing effect of the harvester.

[0006] To this end, the present invention proposes a double-screw threshing and conveying system, comprising:

[0007] Two concave plate screens are arranged on the frame in parallel and at intervals in the horizontal direction; the inner screen surface of any of the concave plate screens is in an arc shape; transition ports are radially provided at one end of the two concave plate screens located on the same side of the frame; the two transition ports are opposite to each other and are connected to each other;

[0008] A transition plate screen, laid between the two concave plate screens and connecting the two transition ports;

[0009] A crop feeding port is provided on the concave plate screen at the other end opposite to the transition port and away from the transition port;

[0010] Two barrel covers are corresponding to each other and buckled on the concave plate screen, and a hollow cylindrical installation cavity is formed between the barrel covers and the concave plate screen; a plurality of guide members are arranged at intervals on the wall surface of any barrel cover facing the installation cavity, and are suitable for guiding the crops entering the installation cavity to move in a directional manner around the axis; the guiding directions of the guide members in the two barrel covers are opposite;

[0011] Two drums are coaxially and rotatably arranged in the installation cavity respectively; there are gaps between the drums and the corresponding inner sieve surfaces and the end faces of the guiding members respectively; the working areas of the drums are the same as the lengths of the corresponding concave screens; the lengths of the two concave screens are the same.

[0012] It further includes a limit adjustment structure which is detachably arranged at the notch formed between the outer sieve surfaces of the two concave screens and the transition plate screen.

[0013] The limit adjustment structure further includes:

[0014] Two adjusting members, which are integrally arc-shaped and are respectively fixed on the two concave screens on both sides of the notch; both sides of the sealing plate are respectively fixed on the two adjusting members.

[0015] Any one of the adjusting members includes:

[0016] An adjusting plate, the plate surface of which is arc-shaped and matches the concave screen to which it is fixed; the plate surface of the adjusting plate is suitable for partially blocking the transition opening;

[0017] Two mounting plates, which are arranged along the bending of the adjusting plate and are respectively fixed on the opposite sides of the adjusting plate; one of the mounting plates is suitable for being fixed on the concave screen, and the other mounting plate is suitable for fixedly connecting the sealing plate.

[0018] The cross-section of the adjusting member is in a U shape.

[0019] The sieve surface of the transition plate screen is tangent to the inner sieve surface of the concave screen that first contacts the crop.

[0020] The cylinder cover includes a square mounting frame and an arc-shaped cover body hinged to one side frame edge of the mounting frame; the mounting frame is suitable for being lapped and fixed on the edge of the concave screen;

[0021] The cover body includes an arc-shaped top cover and side top plates sealed on both sides of the top cover; the guiding members are arranged at intervals along the inner wall surface of the top cover, and a guiding channel is formed between adjacent guiding members.

[0022] A plurality of拨动 members are arranged at intervals along the axial direction of any one of the drums; all the拨动 members have the same size; the distance from the end face of any one of the拨动 members to the axis of the drum forms the rotation radius of the drum;

[0023] The height of the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop later from the horizontal plane is greater than the height of the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop first from the horizontal plane.

[0024] The rotation radius of the roller that contacts the crop later is smaller than the rotation radius of the roller that contacts the crop earlier.

[0025] The highest point of the cylindrical surface formed by the rotation of the roller that contacts the crop later and the highest point of the cylindrical surface formed by the rotation of the roller that contacts the crop earlier are located at the same horizontal height.

[0026] Any of the drums also includes:

[0027] Roller shaft;

[0028] A plurality of webs are coaxially and spaced apart on the drum shaft; a plurality of mounting portions are spaced apart on the outer circumference of any web;

[0029] A plurality of threshing tooth rods are straddled on all the webs and fixed on the mounting portion; a plurality of shifting members are arranged at intervals on any of the threshing tooth rods.

[0030] The shifting teeth on adjacent threshing tooth rods are arranged at intervals in the axial direction of the drum.

[0031] The present invention provides a combine harvester, comprising the double-helix threshing and conveying system described above.

[0032] The technical solution of the present invention has the following advantages:

[0033] 1. The double-spiral threshing and conveying system provided by the present invention includes two threshing spaces arranged horizontally and spaced apart in the front and back directions of the harvester. The threshing space is a hollow cylindrical installation cavity surrounded by a concave plate screen and a cylinder cover, and a roller is installed in each installation cavity. Guide members are arranged at intervals on the inner wall surface of the cylinder cover to guide the crops entering the threshing space to move in a directional manner around the axis. When the cylinder rotates, the crops are driven to move and enter the second threshing space from the first threshing space under the guidance of the guide member. The working areas of the two threshing spaces are the same length. Therefore, the crop threshing path passes through the length of the two rollers and can be fully threshed. The two threshing spaces are arranged horizontally at intervals, which makes the structure on the frame more compact. The two threshing working areas are the same length, and a sufficiently long threshing path can be guaranteed, which fully guarantees the threshing effect while ensuring the overall maneuverability of the harvester.

[0034] 2. The double-helix threshing and conveying system provided by the present invention is provided with a limit adjustment structure at the gap formed between the outer screen surface of the two concave screens and the transition screen plate, and the limit adjustment structure is detachably fixed to the concave screens on both sides. When the limit adjustment structure is not provided, part of the crops will fall from the gap into the lower vibrating screen after passing through the first concave screen only, and directly enter the subsequent process. When the limit adjustment structure is provided, the crops will pass through the complete "J" shape from the first concave screen via the transition screen to the second concave screen, with a longer transmission path and better threshing and screening effect.

[0035] 3. The double-helix threshing and conveying system provided by the present invention has a limit adjustment structure including an adjustment plate and mounting plates arranged on both sides of the adjustment plate. The plate surface of the adjustment plate is in an arc shape matching the concave plate screen, and the plate surface of the adjustment plate is suitable for partially blocking the transition port. The adjustment plate can select plate surface sizes of different widths as needed to adjust the size of the transition port through which the crop passes, thereby partially extending the transmission path of the crop and extending the threshing, separation and screening time of the crop.

[0036] 4. The double-screw threshing and conveying system provided by the present invention has a cross-sectional curvature of 180 degrees for the concave screen; the concave screen includes an arc-shaped screen surface and connecting beams horizontally arranged at both ends of the screen surface, and the connecting beams are suitable for overlapping the assembly beams of the frame. The connecting beam is arranged horizontally and can be overlapped with the horizontal installation surface of the assembly beam on the frame. During installation, the concave screen only needs to be placed between the two assembly beams, so that the connecting beam is overlapped on the assembly beam, and then the connecting beam is fixed to the assembly beam by the locking assembly, without the need for palm support welding and fixing, and the structure is simple, and the installation operation is simple and easy, saving manpower and material resources.

[0037] 5. In the double-helix threshing and conveying system provided by the present invention, the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop later is higher than the lowest point of the cylindrical surface formed by the rotation of the drum that contacts the crop earlier. This structural design increases the distance between the drum that contacts the crop later and the horizontal vibrating screen below, so that the debris falling from the drum that contacts the crop later to the vibrating screen can be fully screened by wind. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 The structure of the concave plate screen in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0040] Figure 2 It is a schematic diagram of the assembly structure of the concave plate screen in an embodiment of the present invention;

[0041] Figure 3 It is a schematic diagram of the assembly structure of the concave plate screen, the drum cover and the drum in the embodiment of the present invention;

[0042] Figure 4 The structure of the concave plate screen in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0043] Figure 5The structure of the concave plate screen in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0044] Figure 6 It is a schematic diagram of the exploded structure of the concave plate screen and the cylinder cover assembly in an embodiment of the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of the double rollers in an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the movement of crops in a double-drum structure in an embodiment of the present invention;

[0047] Fig. 9 Schematic diagram of the structure of the first roller in an embodiment of the present invention;

[0048] Fig.10 Schematic diagram of the structure of the second roller in an embodiment of the present invention;

[0049] Fig.11 It is a schematic diagram of the structure of the cylinder cover in an embodiment of the present invention;

[0050] Fig.12 Schematic diagram of the distribution structure of the grass guide plate in the embodiment of the present invention.

[0051] Description of reference numerals:

[0052] 1. Frame; 2a. First roller; 3a. Second roller; 4a. Roller shaft; 5a. Plate; 51a. Adjustment hole; 52a. Limiting groove; 53a. Plate seat; 6a. Threshing gear rod; 7a. Driving gear; 8a. Connecting plate; 9a. Anti-entanglement ring; W. Working area; D. Grass discharge area;

[0053] 11b, assembly beam; 110b, assembly hole; 111b, positioning pin; 2b, first concave screen; 21b, feeding port; 3b, second concave screen; 4b, side guard plate; 41b, steel wire; 5b, connecting beam; 50b, second mounting hole; 501b, positioning hole; 51b, grid bar; 6b, transition port; 7b, transition screen; 8b, reinforcing rib; 9b, sealing plate; 91b, adjusting plate; 92b, mounting plate; 10b, notch;

[0054] 2c, first tube cover; 21c, cover body; 211c, top cover; 212c, side top plate; 22c, mounting frame; 23c, handle; 24c, grass guide plate; 3c, second tube cover; 9c, fastener; 91c, hand-held part; 92c, threaded part; 93c, washer. DETAILED DESCRIPTION

[0055] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Example 1

[0060] This embodiment provides a double-screw conveying system, including two threshing spaces arranged horizontally and spaced apart in the front and back direction of the harvester. The threshing space is a hollow cylindrical installation cavity surrounded by a concave plate screen and a cylinder cover, and a roller is installed in each installation cavity. Guide members are arranged at intervals on the inner wall surface of the cylinder cover to guide the crops entering the threshing space to move in a directional manner around the axis. When the roller rotates, the crops are driven to move and enter the second threshing space from the first threshing space under the guidance of the guide member. The working areas of the two threshing spaces are the same length. Therefore, the crop threshing path passes through the length of the two rollers and can be fully threshed. The two threshing spaces are arranged horizontally at intervals, which makes the structure on the frame more compact. The two threshing working areas are the same length, and a sufficiently long threshing path can be guaranteed, which fully guarantees the threshing effect while ensuring the overall maneuverability of the harvester.

[0061] like Figure 2As shown, the two concave screens are respectively a first concave screen 2b with a feeding port 21b and a second concave screen 3b arranged adjacent to the first concave screen 2b in the crop transmission direction, and the first concave screen 2b and the second concave screen 3b have the same length, that is, the length of the screening area is the same. The inner screen surface of each concave screen is in an arc shape, and the axes of the two concave screens are parallel to each other and fixed on the frame 1 at intervals in the horizontal direction.

[0062] like Figure 1 As shown, each concave screen includes two side guard plates 4b, two connecting beams 5b, a plurality of grid bars 51b, a plurality of steel wires 41b and a plurality of reinforcing ribs 8b. The two side guard plates 4b are respectively in the shape of arcs, the side guard plates 4b are coaxial and arranged opposite to each other, the two ends of the two side guard plates 4b are welded and fixed together by connecting beams 5b, and an installation space is enclosed between the two side guard plates 4b and the two connecting beams 5b. In this embodiment, the grid bars 51b are arranged in parallel with the connecting beams 5b and are fixed across the two side guard plates 4b, the spacing between adjacent grid bars 51b is the same, and they are evenly spaced and radially distributed along the side guard plates 4b, that is, the plane where each grid bar 51b is located intersects on the axis of the concave screen, and the center of the arc where the side guard plates 4b are located is located on the axis. A plurality of through holes are evenly spaced apart on each grid bar 51b. The steel wire 41b is arranged parallel to the side guard plate 4b and passes through the through holes on each grid bar 51b in sequence. The two ends of the steel wire 41b are fixed on the connecting beam 5b or the grid bar 51b respectively. All grid bars 51b and steel wires 41b cross each other to form a plurality of grid units, and all grid units together form a grid-like screen surface. In this embodiment, the reinforcing ribs 8b are arranged parallel to the side guard plates 4b and fixed on the outer screen surface at intervals. The grid bars 51b are welded and fixed to the side guard plates 4b on both sides, and the reinforcing ribs 8b are also fixed to all grid bars 51b by welding.

[0063] In this embodiment, the separation angles of the first concave screen 2b and the second concave screen 3b are both 180 degrees, that is, the side guard plate 4b is in a semicircular arc shape as a whole. When the separation angle is greater than 180 degrees, the upper space of the concave screen is wasted. Secondly, the upper part is curved, and the grains are thrown out of the concave screen from the upper part, and may fall back into the concave screen when falling, affecting the cleaning effect. When it is less than 180 degrees, the area of ​​the screen surface is reduced, which also affects the cleaning effect.

[0064] In this embodiment, the area of ​​the grid unit in the first concave screen 2b is smaller than the area of ​​the grid unit in the second concave screen 3b, so that only crop grains pass through the first concave screen 2b, and the second concave screen is suitable for passing grains and other small debris, so as to prevent the debris from entraining the grains and discharging them from the grass discharge port, causing losses. Specifically, when the spacing between two adjacent grid bars 51b in the two concave screens is the same, the spacing between two adjacent steel wires 41b in the second concave screen 3b is greater than the spacing between two adjacent steel wires 41b in the first concave screen 2b; or, when the spacing between two adjacent steel wires 41b in the two concave screens is the same, the spacing between two adjacent grid bars 51b in the second concave screen 3b is greater than the spacing between two adjacent grid bars 51b in the first concave screen 2b; or the spacing between adjacent grid bars 51b and adjacent steel wires 41b in the second concave screen 3b is greater than the spacing between adjacent grid bars 51b and adjacent steel wires 41b in the first concave screen 2b. Of course, the steel wires 41b in each concave screen can be withdrawn at intervals as needed to increase the area of ​​the grid unit.

[0065] For example Figure 1 As shown, transition ports 6b are respectively provided at one end of the two concave plate screens on the same side of the frame in the radial direction, and the two transition ports 6b are arranged opposite to each other, and the two concave plate screens are connected to each other through the transition ports 6b. The transition plate screen 7b is laid between the two transition ports 6b, and the transition plate screen 7b includes a screen frame, which is a square structure, and the grid bars 51b are evenly spaced in the horizontal direction in the screen frame. Similarly, a plurality of through holes are evenly spaced on any grid bar 51b, and the steel wire 41b passes through the through holes on the grid bar 51b in the longitudinal direction in sequence. Among them, the width direction of the square screen frame is the horizontal direction, and the length direction is the longitudinal direction. The feeding port 21b is arranged on the side of the first concave plate screen 2b opposite to the transition port 6b and away from the transition port 6b, and the transmission path of the crop from the feeding port 21b into the concave plate screen is in the shape of a "J".

[0066] like Figure 2 As shown, three assembly beams 11b are arranged at intervals on the frame 1, and the connecting beams 5b on both sides of the first concave plate screen 2b are overlapped and fixed between the first and second assembly beams 11b. Similarly, the connecting beams 5b on both sides of the second concave plate screen are overlapped and fixed between the second and third assembly beams 11b. The transition port 6b is opened near one side of the frame 1. This structural design can make the layout of the two concave plate screens on the harvester frame 1 compact while improving the path of the crops passing through the concave plate screens for threshing and screening, greatly improving the overall mobility and threshing effect of the harvester.

[0067] A hollow cylindrical installation cavity is formed between the drum cover and the corresponding concave screen, and the installation cavity forms a threshing space. Figure 3As shown in the figure, a first threshing space is formed between the first cylinder cover 2c and the first concave sieve 2b. The first cylinder 2a is installed in the first threshing space, and a gap is provided between the end face of the first concave sieve 2b and the end face of the stirring teeth of the first cylinder 2a. A second threshing space is formed between the second cylinder cover 3c and the second concave sieve 3b. The second cylinder 3a is installed in the second threshing space. At the same time, a gap is provided between the end face of the second concave sieve 3b and the end face of the stirring teeth of the second cylinder 3a. The transition port 6b communicates with the first threshing space and the second threshing space, and the crop enters the second threshing space from the first threshing space via the transition plate sieve 7b.

[0068] As Figure 4 shown in the figure, a limit adjustment structure is provided at the notch 10b formed between the outer sieve surface of the two concave sieves and the transition sieve plate. The limit adjustment structure is detachably fixed on the first concave sieve 2b and the second concave sieve 3b on both sides. When the limit adjustment structure is not provided, some crops fall into the lower vibrating sieve from the notch 10b only after passing through the first concave sieve 2b and directly enter the subsequent process. When the limit adjustment structure is provided, the crops enter the second concave sieve 3b from the first concave sieve 2b via the transition plate sieve 7b through a complete "Ji" - shaped path, with a longer transmission path and better threshing and screening effects.

[0069] In this embodiment, the limit adjustment structure includes a sealing plate 9b, and the shape of the sealing plate 9b matches the shape of the notch 10b. Further, it also includes an adjusting member connecting the sealing plate 9b and the two concave sieves. As Figure 4 and Figure 5 shown in the figure, the adjusting member includes an adjusting plate 91b and two mounting plates 92b fixed on both sides of the adjusting plate 91b. The plate surface of the adjusting plate 91b is in an arc shape matching the concave sieve to which it is fixed. The two mounting plates 92b are bent along the adjusting plate 91b and are respectively fixed on opposite sides of the adjusting plate 91b. One mounting plate 92b is used for fixedly connecting to the concave sieve, and the other mounting plate 92b is used for fixedly connecting to the sealing plate 9b. In this embodiment, the cross - section of the adjusting member is in a C - shape, and the adjusting plate 91b and the mounting plates 92b on both sides are integrally formed. The plate surface of the adjusting plate 91b is suitable for partially blocking the transition port 6b. The adjusting plate 91b can select plate surface sizes with different widths according to needs to adjust the size of the transition port 6b for the passing crops, thereby partially extending the transmission path of the crops and prolonging the threshing, separation, and screening time of the crops.

[0070] As Figure 6 shown in the figure, the radian of the cross - section of the concave sieve and the cylinder cover is 180 degrees. A plurality of locking assemblies, and any one of the locking assemblies is adapted to sequentially pass through the mounting frame 22c and the connecting beam 5b and be locked and fixed on the assembly beam 11b.

[0071] The connecting beam 5b is arranged horizontally, and can be overlapped with the horizontal mounting surface of the assembly beam 11b on the frame 1. During installation, it is only necessary to place the concave plate screen between the two assembly beams 11b and place the connecting beam 5b on the assembly beam 11b. There is no need for welding and fixing, thus reducing a lot of manpower and material resources.

[0072] like Figure 6 As shown, the mounting frame 22c is square, and the cover 21c is hinged on one side of the mounting frame 22c and is suitable for buckling on the mounting frame 22c. The frame surface of the mounting frame 22c is suitable for overlapping and fitting with the surface of the connecting beam 5b, which is convenient for assembly.

[0073] like Fig.11 As shown, the cover body 21c includes an arc-shaped top cover 211c and two side top plates 212c blocking the top cover 211c on both sides. The top cover 211c has an arc of 180 degrees, and guide members are evenly spaced on the inner wall surface of the top cover 211c. In this embodiment, the guide members are grass guide plates 24c, which are arc-shaped plates arranged along the arc surface of the top cover 211c. Fig.12 As shown, the grass guide plate 24c is set at a certain angle with the axis of the cylinder cover to guide the crops entering the threshing space in the same direction. And in order to meet the "J"-shaped trend of the crops between the two threshing spaces, as shown in FIG. Fig.12 As shown, in this embodiment, the grass guide plates 24c in the first barrel cover 2c and the second barrel cover 3c are axially symmetrically arranged about the middle assembly beam 11b, that is, the guiding directions of the grass guide plates 24c in the two barrel covers are opposite.

[0074] For example Figure 6 As shown, the locking assembly includes a fastener 9c and a washer 93c. In this embodiment, the fastener 9c is made of hexagonal steel, and the fastener 9c includes a hexagonal hand-held portion 91c and a threaded portion 92c formed below the hand-held portion 91c. Correspondingly, an assembly hole 110b threadedly matched with the threaded portion 92c is provided on the assembly beam 11b, a plurality of first mounting holes (not shown in the figure) are arranged at intervals along the frame of the mounting frame 22c, and a plurality of second mounting holes 50b are arranged at intervals on the connecting beam 5b. The first mounting hole, the second mounting hole 50b and the assembly hole 110b are arranged correspondingly, and the fastener 9c passes through the first mounting hole and the second mounting hole 50b in sequence and is fixed in the assembly hole 110b. Washers 93c are arranged between the mounting frame 22c and the fastener 9c, and between the connecting beam 5b and the assembly beam 11b. The washer 93c is coaxially sleeved on the threaded portion 92c of the fastener 9c. In this embodiment, the aperture of the corresponding first mounting hole is smaller than the aperture of the second mounting hole 50b, so as to correct the slight misalignment between the concave plate screen and the cylinder cover. Further, the first mounting hole can also be provided with an internal thread to match the external thread of the fastener 9c to increase the locking strength.

[0075] To improve the installation accuracy, a positioning component is also provided, such as Figure 6 As shown, the positioning component includes at least one positioning pin 111b, which is arranged on the assembly beam 11b. In this embodiment, a positioning pin 111b is arranged at each end of each assembly beam 11b, and the positioning pin 111b is cylindrical. Positioning holes 501b are respectively formed on the connecting beam 5b and the mounting frame 22c, and the positioning holes 501b are adapted to be sleeved on the corresponding positioning pins 111b. The apertures of the positioning holes 501b on the connecting beam 5b and the mounting frame 22c are the same and are slightly larger than the diameter of the positioning pin 111b, so as to correct the slight misalignment of the first mounting hole and the second mounting hole 50b relative to the assembly hole 110b.

[0076] The concave screen and the cylinder cover are integrally assembled onto the assembly beam 11b of the harvester frame 1 through the fastener 9c, with a simple structure and easy installation operation, saving manpower and material resources.

[0077] Such as Figure 3 Or Figure 7 As shown, the axes of the two drums are parallel to each other and are arranged at intervals in the crop conveying direction. A plurality of toggling members are arranged at intervals along the drum shaft 4a on any one drum, and an operation area W is formed between the two toggling members at the two ends of the drum. The lengths of the two operation areas W are the same as those of the corresponding concave screens. In this embodiment, the lengths of the two concave screens are the same. As Figure 8 As shown, the crop first enters the first drum 2a from the feeding port 21b, is threshed by the rotation of the first drum 2a and is spirally conveyed into the second drum 3a located at the rear, then is threshed by the rotation of the second drum 3a, and finally is spirally conveyed to the straw discharging area D and the threshed straw is discharged. The crop spirally advances in the double-drum structure and has a U-shaped path, and the travel length is the sum of the lengths of the two drums. The threshing travel is long and the threshing effect is obvious. One end of the two drums is flush and the overall axial directions are parallel, without occupying extra space, making the overall structure of the combine harvester compact.

[0078] The overall structures of the first drum 2a and the second drum 3a are the same. The difference is that a straw discharging area D is added at the end of the crop travel of the second drum 3a. As Fig. 9 And Fig.10 As shown, any one drum includes a drum shaft 4a, a plurality of disk plates 5a and a plurality of threshing tooth rods 6a. In this embodiment, three disk plates 5a are arranged in the operation area W of both the first drum 2a and the second drum 3a, and one disk plate 5a is arranged in the straw discharging area D of the second drum 3a. All the disk plates 5a are evenly and spacedly fixed on the corresponding drum shaft 4a through the disk plate 5a seats.

[0079] A plurality of mounting parts are arranged at intervals on the outer circumference of any web 5a. In this embodiment, any mounting part includes a limiting groove 52a and a plurality of groups of adjustment holes 51a arranged on the outer circumference of the limiting groove 52a. The groove shape of the limiting groove 52a matches the threshing gear rod 6a and is suitable for the threshing gear rod 6a to be embedded. The connecting rod is welded and fixed on the threshing gear rod 6a. The threshing gear rod 6a and the web 5a are detachably connected together through the connecting plate 8a. The connecting plate 8a is provided with through holes corresponding to any group of adjustment holes 51a. Bolts pass through the corresponding adjustment holes 51a and the through holes on the connecting plate 8a to fix the threshing gear rod 6a on the web 5a. The angle adjustment of the toggle member on the threshing gear rod 6a is achieved by fixing the bolts in different adjustment holes 51a.

[0080] like Fig. 9 As shown, in this embodiment, eight limiting grooves 52a are provided on any web 5a, six of which are evenly spaced on the circumference of the web 5a, and the other two limiting grooves 52a are used as spare grooves and are arranged oppositely on the outer circumference of the web 5a. In this embodiment, six threshing tooth rods 6a are provided, which are respectively fixed in the six limiting grooves 52a evenly distributed on the circumference of the web 5a, and a plurality of toggle members are arranged at intervals on each threshing tooth rod 6a. In this embodiment, the toggle members are cylindrical toggle teeth 7a. The toggle teeth 7a on adjacent threshing tooth rods 6a are arranged at intervals in the axial direction of the drum to enhance the threshing effect.

[0081] All the shifting teeth 7a in the working area W have the same size. Figure 3 As shown in FIG. 1 , the tilt angles of the toggle teeth 7a on the same drum relative to the drum axis 4a are the same, forming a radial structure. The distance from the end face of any toggle tooth 7a to the axis of the drum forms the rotation radius of the drum. When the drum rotates, the end faces of all the toggle teeth 7a together form a cylindrical surface. In this embodiment, Figure 3 As shown, the height of the lowest point of the cylindrical surface of the second roller 3a from the horizontal plane is greater than the height of the lowest point of the cylindrical surface of the first roller 2a from the horizontal plane. Furthermore, the rotation radius of the second roller 3a is smaller than the rotation radius of the first roller 2a, and the height of the roller shaft 4a of the second roller 3a is higher than the height of the roller shaft 4a of the first roller 2a, and the highest points of the rotating cylindrical surfaces of the second roller 3a and the first roller 2a are at the same horizontal height. This structural design increases the distance between the rear contacting roller and the horizontal vibrating screen below, so that the debris falling from the rear contacting roller to the vibrating screen can be fully screened by wind.

[0082] In the path of crops, such as Fig. 9 and Fig.10 As shown, the first roller 2a and the second roller 3a are respectively provided with an anti-entanglement ring 9a at the transfer end, that is, Figure 7As shown, the first roller 2a is fixed to one end of the roller shaft 4a of the right frame 1 and an anti-winding ring 9a is provided, and the second roller 3a is fixed to one end of the roller shaft 4a of the right frame 1 and an anti-winding ring 9a is provided to prevent crop straw from being entangled on the roller shaft 4a and hindering crop transportation.

[0083] The working process of the double screw conveying system in this embodiment is as follows:

[0084] The crops enter the first threshing space from the feeding port 21b, and are stirred by the rotation of the toggle member of the drum. The crops are centrifugally moved along the inner wall of the concave plate screen and the drum cover, and guided by the guide member on the drum cover, and make spiral motion along the set direction. From the feeding port 21b, the crops move along the first threshing space to the transition port, enter the second threshing space through the transition plate screen, and are threshed by the spiral guide motion in the opposite direction to that in the first threshing space, and enter the grass discharge area D. The crops are threshed in spiral motion in both threshing spaces, and move along the "J"-shaped path formed by the two threshing spaces, with a long travel distance and more complete threshing.

[0085] Example 2

[0086] This embodiment provides a combine harvester, including the double-screw conveying system in Embodiment 1.

[0087] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A double spiral threshing and conveying system, It is characterized in that include: Two concave plate screens are arranged on the frame (1) in parallel and at intervals in the horizontal direction; the inner screen surface of any of the concave plate screens is in an arc shape; a transition opening (6b) is radially provided at one end of the two concave plate screens located on the same side of the frame (1); the two transition openings (6b) are opposite to each other and are connected to each other; A transition plate screen (7b), laid between the two concave plate screens and connecting the two transition ports (6b); A crop feeding port (21b) is provided on the concave plate screen at the other end thereof, which is opposite to the transition port (6b) and away from the transition port (6b); Two barrel covers are corresponding to each other and buckled on the concave plate screen, and a hollow cylindrical installation cavity is formed between the barrel covers and the concave plate screen; a plurality of guide members are arranged at intervals on the wall surface of any barrel cover facing the installation cavity, and are suitable for guiding the crops entering the installation cavity to move in a directional manner around the axis; The guiding directions of the guide members in the two cylinder covers are opposite; Two rollers are coaxially and rotatably arranged in the installation cavity; gaps are provided between the rollers and the corresponding inner screen surface and the end surface of the guide member; the working area of ​​the roller is the same as the length of the corresponding concave screen; the two concave screens are the same in length; A plurality of toggle members are arranged on any of the rollers at intervals along the axial direction of the roller; all of the toggle members have the same size; the distance from the end surface of any of the toggle members to the axis of the roller forms the rotation radius of the roller; The height of the lowest point of the cylindrical surface formed by the rotation of the roller that contacts the crop later from the horizontal plane is greater than the height of the lowest point of the cylindrical surface formed by the rotation of the roller that contacts the crop earlier from the horizontal plane; The rotation radius of the roller that contacts the crop later is smaller than the rotation radius of the roller that contacts the crop earlier; The highest point of the cylindrical surface formed by the rotation of the roller that contacts the crop later and the highest point of the cylindrical surface formed by the rotation of the roller that contacts the crop earlier are at the same level; The limit adjustment structure is detachably arranged at the gap (10b) formed between the outer screen surfaces of the two concave plate screens and the transition plate screen (7b).

2. The double spiral threshing and conveying system according to claim 1, It is characterized in that The limit adjustment structure also includes: Two adjusting members are in an arc shape as a whole and are respectively fixed on the two concave plate screens on both sides of the notch (10b); A sealing plate (9b) having a shape matching that of the notch (10b), and two sides of the sealing plate (9b) are respectively fixed on the two adjusting members.

3. The double spiral threshing and conveying system according to claim 2, It is characterized in that Any of the adjusting members comprises: The adjusting plate (91b) has a plate surface in an arc shape matching the concave plate screen to which it is fixed; the plate surface of the adjusting plate (91b) is suitable for partially blocking the transition port (6b); Two mounting plates (92b), which are bent along the adjusting plate (91b) and are respectively fixed on opposite sides of the adjusting plate (91b); one of the mounting plates (92b) is adapted to be fixed on the concave screen, and the other mounting plate (92b) is adapted to be fixedly connected to the sealing plate (9b).

4. The double - helix threshing and conveying system according to claim 3, wherein, the cross - section of the adjusting member is in a U - shape.

5. The double - helix threshing and conveying system according to any one of claims 1 - 4, wherein, the screen surface of the transition plate screen (7b) is tangentially arranged with the inner screen surface of the concave screen that first contacts the crop.

6. The double - helix threshing and conveying system according to any one of claims 1 - 4, wherein, the cylinder cover includes a square mounting frame (22c) and an arc - shaped cover body (21c) hinged to one side frame of the mounting frame (22c); the mounting frame (22c) is adapted to be lapped and fixed on the edge of the concave screen; the cover body (21c) includes an arc - shaped top cover (211c) and side top plates (212c) blocking both sides of the top cover (211c); the guiding members are arranged at intervals along the inner wall surface of the top cover (211c), and a guiding channel is formed between adjacent guiding members.

7. The double - helix threshing and conveying system according to claim 1, wherein, any one of the drums further includes: a drum shaft (4a); a plurality of disk plates (5a), which are coaxially and spacedly arranged on the drum shaft (4a); a plurality of mounting parts are spacedly arranged on the outer circumference of any one of the disk plates (5a); a plurality of threshing tooth rods (6a), which straddle all the disk plates (5a) and are fixed on the mounting parts; a plurality of拨动件 (the specific name needs to be further determined according to the context) are spacedly arranged on any one of the threshing tooth rods (6a).

8. The double - helix threshing and conveying system according to claim 7, wherein, the拨动件 (the specific name needs to be further determined according to the context) on adjacent threshing tooth rods (6a) are spaced from each other in the axial direction of the drum.

9. A combine harvester, wherein, it includes the double - helix threshing and conveying system according to any one of claims 1 - 8.

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