Concave plate screen structure and combine harvester

Abstract

The present invention provides a concave plate screen structure and a combine harvester, wherein the curvature of the cross section of the concave plate screen is 180 degrees; the connecting beams at both ends of the concave plate screen are arranged horizontally and overlapped with the horizontal mounting surface of the assembly beam; during installation, the connecting beams are directly fixed to the assembly beam through a locking assembly, and there is no need to perform palm support welding and fixing; the structure is simple, the installation operation is simple and easy, and manpower and material resources are saved. A limit adjustment structure is arranged at the notch formed between the outer screen surface of the two concave plate screens and the transition screen plate, and the limit adjustment structure is detachably fixed to the concave plate screens on both sides. When the limit adjustment structure is not arranged, part of the crops fall from the notch into the lower vibrating screen after passing through the first concave plate screen, and directly enter the subsequent process; when the limit adjustment structure is arranged, the crops enter the second concave plate screen from the first concave plate screen via the transition plate screen through a complete "J"-shaped direction, the transmission path is longer, and the threshing and screening effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to an adjustable concave plate screen structure 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 existing transverse flow threshing and cleaning system is divided into a single-drum transverse flow threshing and cleaning system and a 1.5-drum transverse flow threshing and cleaning system. The single-drum system is threshing by one drum, and the crop travels the length of one drum. In the 1.5-drum system, a feeding drum with half the length of the single drum is added in front of the single drum, that is, the added half drum only plays the role of continuously feeding the crop, but hardly plays the role of threshing. Therefore, the threshing travel of the existing transverse flow threshing and cleaning system is short. The corresponding concave plate screen arranged under the front drum hardly plays a screening role.

[0004] When encountering difficult-to-thresh varieties, the threshing and screening path is too short, which can easily lead to some of the fed crop grains being discharged from the body before they can be screened out, causing losses. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the concave plate screen corresponding to the drum in the prior art has a short screening path and is prone to cause crop losses.

[0006] To this end, the present invention proposes a concave plate screen structure, comprising:

[0007] Two concave screens are arranged in parallel and at intervals in the horizontal direction, the inner screen surface of any concave screen is in an arc shape, and the arc of the cross section of the concave screen is 180 degrees;

[0008] Any of the concave plate screens comprises connecting beams horizontally arranged at both ends of the screen surface; the connecting beams are suitable for horizontally overlapping the mounting beams of the frame;

[0009] A plurality of locking assemblies, any locking assembly is suitable for passing through the connecting beam and being locked and fixed on the assembly beam.

[0010] A transition opening is radially provided at one end of the two concave plate screens located on the same side of the frame; the two transition openings are directly opposite and connected to each other;

[0011] A transition plate screen, laid between the two concave plate screens and connecting the two transition ports;

[0012] 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;

[0013] The limit adjustment structure is detachably arranged at the notch formed between the outer sieve surfaces of the two concave sieve plates and the transition sieve plate.

[0014] The limit adjustment structure includes:

[0015] A sealing plate, which matches the shape of the notch and is fixed to the two concave sieve plates on both sides respectively.

[0016] The limit adjustment structure further includes:

[0017] Two adjusting members, which are integrally arc-shaped and are respectively fixed to the two concave sieve plates on both sides of the notch; both sides of the sealing plate are respectively fixed to the two adjusting members.

[0018] Any one of the adjusting members includes:

[0019] An adjusting plate, the plate surface of which is arc-shaped to match the concave sieve plate to which it is fixed; the plate surface of the adjusting plate is suitable for partially blocking the transition opening;

[0020] Two mounting plates, which are arranged along the bending of the adjusting plate and are respectively fixed to the opposite sides of the adjusting plate; one of the mounting plates is suitable for being fixed to the concave sieve plate, and the other mounting plate is suitable for fixedly connecting the sealing plate.

[0021] The cross-section of the adjusting member is in a U shape.

[0022] The locking assembly includes:

[0023] A fastener, which is suitable for passing through the second mounting hole on the connecting beam and is fixed in the assembly hole on the assembly beam;

[0024] Washers are arranged between the connecting beam and the fastener, and between the connecting beam and the assembly beam; the washers are coaxially sleeved on the fastener.

[0025] The fastener is made of hexagonal steel.

[0026] The fastener includes a hexagonal hand-held part and a threaded part formed below the hand-held part; internal threads matching the threaded part are arranged in the assembly hole.

[0027] It further includes a positioning assembly; the positioning assembly includes:

[0028] At least one positioning pin, which is arranged on the assembly beam;

[0029] Positioning holes are formed on the connecting beam, which are suitable for being sleeved on the positioning pins.

[0030] The present invention provides a combine harvester, comprising the concave plate screen structure described above.

[0031] The technical solution of the present invention has the following advantages:

[0032] 1. The concave plate screen structure provided by the present invention has a limit adjustment structure at the gap formed between the outer screen surface of the two concave plate screens and the transition screen plate, and the limit adjustment structure is detachably fixed to the concave plate screens on both sides. When the limit adjustment structure is not set, part of the crops will fall from the gap into the lower vibrating screen after passing through the first concave plate screen and directly enter the subsequent process. When the limit adjustment structure is set, the crops will pass through the transition plate screen from the first concave plate screen to the second concave plate screen through a complete "J" shape, with a longer transmission path and better threshing and screening effect.

[0033] 2. The concave plate screen structure 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.

[0034] 3. The concave plate screen structure provided by the present invention has a cross-sectional curvature of 180 degrees; the concave plate 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 beams are arranged horizontally and can be overlapped with the horizontal installation surface of the assembly beam on the frame. During installation, the concave plate 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 through the locking assembly, without the need for palm support welding and fixing. The structure is simple, the installation operation is simple and easy, and manpower and material resources are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 The structure of the concave plate screen structure in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0037] Figure 2 The assembly structure of the concave plate screen structure in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0038] Figure 3 The assembly structure of the concave plate screen structure in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0039] Figure 4 The structure of the concave plate screen structure in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0040] Figure 5 The structure of the concave plate screen structure in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0041] 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.

[0042] Description of reference numerals:

[0043] 1. Frame; 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. Reinforcement rib; 9b. Closing plate; 91b. Adjustment plate; 92b. Mounting plate; 10b. Notch;

[0044] 2a, first roller; 3a, second roller; 2c, first cylinder cover; 21c, cover body; 22c, mounting frame; 3c, second cylinder cover; 9c, fastener; 91c, hand-held part; 92c, threaded part; 93c, washer. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Example 1

[0050] This embodiment provides a concave plate screen structure, such as Figure 2 As shown, two concave screens are included, namely, a first concave screen 2b with a feeding port 21b and a second concave screen 3b adjacent to the first concave screen 2b in the crop transmission direction. 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] For example Figure 1 As shown, transition ports 6b are respectively provided on the two concave screens, and the two screens are interconnected through the transition ports 6b. The transition plate screen 7b is laid between the two transition ports 6b. The transition plate screen 7b includes a screen frame, which is a square structure. 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. 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 provided on the first concave screen 2b, which is opposite to the transition port 6b and away from the transition port 6b. The transmission path of the crop from the feeding port 21b into the concave screen is in the shape of a "J".

[0055] like Figure 2As 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.

[0056] like Figure 3 As shown, the first threshing space is formed between the first cylinder cover 2c and the first concave screen 2b, the first roller 2a is installed in the first threshing space, and a gap is set between the first concave screen 2b and the end face of the toggle teeth of the first roller 2a. The second threshing space is formed between the second cylinder cover 3c and the second concave screen 3b, the second roller 3a is installed in the second threshing space, and a gap is set between the second concave screen 3b and the end face of the toggle teeth of the second roller 3a. The transition port 6b connects 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 screen 7b.

[0057] like Figure 4 As shown, a limit adjustment structure is set at the gap 10b formed between the outer screen surface of the two concave screens and the transition screen plate, and the limit adjustment structure is detachably fixed on the first concave screen 2b and the second concave screen 3b on both sides. When the limit adjustment structure is not set, part of the crops will fall into the lower vibrating screen from the gap 10b after passing through the first concave screen 2b and directly enter the subsequent process. When the limit adjustment structure is set, the crops will pass through the transition screen 7b from the first concave screen 2b to the second concave screen 3b through the complete "J" shape, the transmission path is longer, and the threshing and screening effect is better.

[0058] In this embodiment, the limit adjustment structure includes a sealing plate 9b, the shape of which matches the shape of the notch 10b. Further, it also includes an adjustment member connecting the sealing plate 9b and the two concave screens, such as Figure 4 and Figure 5As shown, 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 screen fixed thereto. 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 the concave screen, and the other mounting plate 92b is used for fixedly connecting the sealing plate 9b. In this embodiment, the cross-section of the adjusting member is in a U 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, so as to partially extend the transmission path of the crops and extend the threshing, separating and screening time of the crops.

[0059] As Figure 6 shown, the cylinder cover and the concave screen are buckled together up and down to form a hollow cylinder structure, and a drum is suitable for being installed in the enclosed cavity. The radian of the cross-section of the concave screen and the cylinder cover is 180 degrees; the concave screen includes an arc-shaped screen surface and connecting beams 5b horizontally arranged at both ends of the screen surface, and the connecting beams 5b are suitable for lapping on the assembly beam 11b of the frame 1. 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 suitable for being in surface contact with the connecting beam 5b and lapping on the assembly beam 11b. A plurality of locking assemblies, and any one of the locking assemblies is suitable for sequentially passing through the mounting frame 22c and the connecting beam 5b and being locked and fixed on the assembly beam 11b. In this embodiment, the radian of the cross-section of the concave screen is set to 180 degrees to provide the best screening and separating angle. When it is set to be greater than 180 degrees, the upper space of the concave screen is wasted. Secondly, the upper part has a radian, and the grains are thrown out of the concave screen from above and may fall back into the concave screen when falling, affecting the cleaning effect.

[0060] The connecting beam 5b is horizontally arranged and can be lapped and attached to the horizontal mounting surface of the assembly beam 11b on the frame 1. During installation, only the concave screen needs to be placed between the two assembly beams 11b so that the connecting beam 5b is lapped on the assembly beam 11b, without the need for holding and welding fixation, reducing a large amount of manpower and material resources.

[0061] In this embodiment, the overall structures of the first cylinder cover 2c and the second cylinder cover 3c are the same, and the sizes are different according to needs, such as different diameters, etc. As Figure 6 shown, the mounting frame 22c is square, and the cover body 21c is hinged to one side frame of the mounting frame 22c. The frame surface of the mounting frame 22c is suitable for lapping and attaching to the surface of the connecting beam 5b, which is convenient for assembly.

[0062] Again, as Figure 6As 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.

[0063] In order to improve the accuracy of installation, positioning components are also provided, such as Figure 6 As shown, the positioning assembly includes at least one positioning pin 111b, which is arranged on the assembly beam 11b. In this embodiment, a positioning pin 111b is respectively arranged at both ends of each assembly beam 11b, and the positioning pin 111b is cylindrical. Positioning holes 501b are respectively provided on the connecting beam 5b and the mounting frame 22c, and the positioning holes 501b are suitable for being sleeved on the corresponding positioning pin 111b. The positioning holes 501b on the connecting beam 5b and the mounting frame 22c have the same aperture, 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.

[0064] The concave plate screen and the cylinder cover are integrally assembled to the assembly beam 11b of the harvester frame 1 by means of the fasteners 9c, which has a simple structure, is easy to install and operate, and saves manpower and material resources.

[0065] Example 2

[0066] This embodiment provides a combine harvester, including the concave plate screen structure described in Example 1.

[0067] 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 concave plate screen structure, characterized in that: Comprising: Two concave screens, which are parallel and spaced in the horizontal direction. The inner screen surface of any one of the concave screens is arc-shaped, and the radian of the cross-section of the concave screen is 180 degrees; Any one of the concave screens includes connecting beams (5b) horizontally arranged at both ends of the screen surface; the connecting beams (5b) are adapted to be horizontally lapped on the assembly beams (11b) of the frame (1); Multiple locking assemblies, and any one of the locking assemblies is adapted to pass through the connecting beam (5b) and be locked and fixed on the assembly beam (11b); One end of the two concave screens on the same side of the frame is provided with a transition port (6b) radially; the two transition ports (6b) are opposite and communicate with each other; A transition plate screen (7b), which is laid between the two concave screens and connects the two transition ports (6b); On one of the concave screens, a feeding port (21b) for crops is provided at the other end opposite to and far from the transition port (6b); A limit adjustment structure is detachably arranged at the notch (10b) formed between the outer screen surfaces of the two concave screens and the transition plate screen (7b); The limit adjustment structure includes: A sealing plate (9b), which matches the shape of the notch (10b), and both sides are respectively fixed on the two concave screens; Two adjusting members, which are integrally arc-shaped and are respectively fixed on the two concave screens on both sides of the notch (10b); both sides of the sealing plate (9b) are respectively fixed on the two adjusting members; Any one of the adjusting members includes: An adjusting plate (91b), 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 (91b) is adapted to partially block 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).

2. The concave plate screen structure according to claim 1, characterized in that: The cross-section of the adjusting member is in a U shape.

3. The concave plate screen structure according to claim 1, characterized in that: The locking assembly includes: A fastener (9c), which is adapted to pass through a second mounting hole (50b) located on the connecting beam (5b) and be fixed in a mounting hole (110b) on the assembly beam (11b); Washers (93c) are arranged between the connecting beam (5b) and the fastener (9c) and between the connecting beam (5b) and the assembly beam (11b); the washers (93c) are coaxially sleeved on the fastener (9c).

4. The concave plate screen structure according to claim 3, characterized in that: The fastener (9c) is made of hexagonal steel.

5. The concave plate screen structure according to claim 4, characterized in that: The fastener (9c) includes a hexagonal hand-held part (91c) and a threaded part (92c) formed below the hand-held part (91c); an internal thread matching the threaded part (92c) is arranged in the mounting hole (110b).

6. The concave plate screen structure according to claim 5, characterized in that: It further includes a positioning assembly; the positioning assembly includes: At least one positioning pin (111b), which is arranged on the assembly beam (11b); A positioning hole (501b) is provided on the connecting beam (5b), which is adapted to be sleeved on the positioning pin (111b).

7. A combine harvester, characterized in that: The concave plate screen structure comprises the concave plate screen structure described in any one of claims 1 to 6.

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