Concave grate structure and combine harvester

Abstract

A concave grate structure and a combine harvester. The radian of the cross section of concave grates (2b, 3b) is 180 degrees. Connecting beams (5b) at two ends of each concave grate are horizontally arranged, and are in lap joint with the horizontal mounting surfaces of assembling beams (11b) in an attached manner. During mounting, the connecting beams (5b) are directly fixed to the assembling beams (11b) by means of locking assemblies. Palm holding, welding and fixing are not needed, the structure is simple, the mounting operation is easy and feasible, and manpower and material resources are saved. Limiting adjusting structures are arranged at notches (10b) formed between outer screen surfaces of the two concave grates (2b, 3b) and a transition grate (7b), and the limiting adjusting structures are detachably fixed to the concave grates (2b, 3b) at the two sides. When the limiting adjusting structures are not arranged, parts of crops only pass through the first concave grate (2b) and then fall into a lower vibrating screen from the notches (10b) to directly enter the subsequent process, and when the limiting adjusting structures are arranged, the crops enter the second concave grate (3b) from the first concave grate (2b) by means of the transition grate (7b) and is in a complete n-shaped trend, the conveying path is longer, and the threshing and screening effect is better.

Description

Technical FieldThe present application relates to the technical field of agricultural machinery, inparticular to an adjustable concave plate sieve structure and a combine harvester.Background ArtA crawler combine harvester threshing system can be divided into a longitudinal axisflow threshing and cleaning system and a horizontal axis flow threshing and cleaning system,and these two forms of threshing and cleaning systems are the main structural forms currentlyused in the market.The existing horizontal axis flow threshing and cleaning system is divided into asingle-drum horizontal axis flow threshing and cleaning system and 1.5-drum horizontal axisflow threshing and cleaning system. As to the single drum, one drum is used for threshing,and the stroke of crops is only the length of one drum. In the 1.5-drum system, a feeding drumof half the length of the single drum is added in front of the single drum, i.e., the additionalhalf of the drum only serves to feed the crop continuously, but hardly plays a role in threshing,therefore, the existing horizontal axis flow threshing and cleaning system has a shortthreshing stroke. The corresponding concave plate sieve set under the front drum is almostuseless for screening.When encountering varieties difficult to be threshed, the threshing and screening pathsare too short, easily leading to losses as some of the fed crop grains are discharged out of themachine before they have time to be screened out.Summary of the InventionTherefore, the technical problem to be solved in the present application is to overcomethe problem in the prior art that the screening path of the concave plate sieve corresponding tothe drum is short, which may easily lead to loss of crops.According to an aspect of the present application, a concave plate sieve structure isprovided, including :two concave plate sieves, arranged to be parallel and spaced apart in a horizontaldirection, wherein an inner sieve surface of any concave plate sieve is arc-shaped, and theradian of a cross section of the concave plate sieve is 180 degrees;any concave plate sieve includes connecting beams arranged horizontally at both ends ofthe sieve surface; and the connecting beams are adapted for being overlapped horizontallyonto the assembly beam of a frame;a plurality of groups of locking assemblies, wherein any of the locking assemblies isadapted for passing through the connecting beam and is fixed to the assembly beam in alocking manner.transition openings are formed in a radial direction on an end of the same side of theframe on two concave plate sieves; and the two transition openings are opposite to each otherand are interconnected;a transition plate sieve, paved between two concave plate sieves and connecting the twotransition openings;a crop feeding opening is formed on the other end, located opposite to the transitionopening and far away from the transition opening, on one of the concave plate sieves; anda limit adjustment structure, detachably arranged at a gap formed between the outer sievesurface of two concave plate sieves and the transition plate sieve.Preferably, the limit adjustment structure includes:a sealing plate, matched with the shape of the gap and with the two sides beingrespectively fixed on the two concave plate sieves.Preferably, the limit adjustment structure further includes:two adjusting members, wherein the adjusting members are arc-shaped and respectivelyfixed on two concave plate sieves at two sides of the gap; and two sides of the sealing plateare respectively fixed on the two adjusting members.Preferably, any of the adjusting members includes:an adjusting plate, wherein a plate surface of the adjusting plate is arc-shaped matchingwith the concave plate sieve to which the plate surface is fixed; and the plate surface of theadjusting plate is adapted for partially blocking the transition opening; andtwo mounting plates, arranged in a curved manner along the adjusting plate and fixed ontwo opposite sides of the adjusting plate respectively; wherein one of the mounting plates isadapted for being fixed on the concave plate sieve and the other mounting plate is adapted forbeing fixedly connected to the sealing plate.Preferably, a cross section of the adjusting member is shaped like a Chinese character"fang".Preferably, the locking assembly includes:a fastener, adapted for passing through a second mounting hole located on the connectingbeam and fixed in an assembly hole on the assembly beam; andwashers are arranged between the connecting beam and the fastener and between theconnecting beam and the assembly beam; and the washers are coaxially sleeved onto thefastener.Preferably, the fasteners are made of hexagonal steel.Preferably, the fastener includes a hexagonal handheld part and a threaded part moldedbelow the handheld part; and the assembly hole is internally provided with internal threads incooperation with the threaded part.Preferably, the above concave plate sieve structure further includes a positioningassembly, and the positioning assembly includes:at least one positioning pin arranged on the assembly beam; anda positioning hole is formed on the connecting beam and is adapted for being sleeved onthe positioning pin.According to another aspect of the present application, a combine harvester is provided,including the above concave plate sieve structure.Technical solutions of the present application have the following advantages:1. In the concave plate sieve structure provided in the present application, a limit adjustmentstructure is arranged at the gap formed between the outer sieve surfaces of the two concaveplate sieves and the transition sieve plate, and the limit adjustment structure is detachablyfixed to the concave plate sieve on both sides. When the limit adjustment structure is not set,some crops will fall into the lower vibrating sieve from the gap after only passing through thefirst concave plate sieve, and directly enter the subsequent process. When the limit adjustmentstructure is set, crops will enter the second concave plate sieve from the first concave platesieve through the transition plate sieve, and pass through a complete shape of the Chinesecharacter "ji", the transmission path is longer, and the threshing and screening effects arebetter.2. In the concave plate sieve structure provided in the present application, the limitadjustment structure includes an adjusting plate and mounting plates arranged on both sides ofthe adjusting plate. The surface of the adjusting plate is in an arc shape that matches with theconcave plate sieve. The surface of the adjusting plate is suitable for partially blocking thetransition opening, and the adjusting plate can be selected with different widths according torequirements, to adjust the size of the transition opening through which crops pass, therebypartially extending the transmission path of crops, and extending the threshing, separating andscreening time of crops.3. As to the concave plate sieve structure provided in the present application, the radiansof a cross section of the concave plate sieve are both 180 degrees; the concave plate sieveincludes an arc-shaped sieve surface and connecting beams arranged horizontally at both endsof the sieve surface; and the connecting beams are adapted for being overlapped ontoassembly beams of a frame. The connecting beam is set horizontally and can be fit andoverlapped with a horizontal mounting surface of the assembly beam on the frame. Duringmounting, it is only necessary to put the concave plate sieve between two assembly beamsand make the connecting beam be overlapped on the assembly beam, and then the connectingbeam is fixed on the assembly beam through a locking assembly, no palm welding andfixation is required, the structure is simple, the mounting and operation are simple andfeasible, and manpower and material resources are saved.Brief Description of the DrawingsIn order to more clearly illustrate technical solutions in embodiments of the presentapplication or in the prior art, a brief introduction will be given below on the accompanyingdrawings which need to be used in the description of the embodiments or in the prior art.Apparently, the accompanying drawings described below are merely some embodiments ofthe present application. For those skilled in the art, other accompanying drawings can beobtained according to these drawings without any creative effort.Fig. 1 is a first structural schematic diagram of a concave plate sieve structure in theembodiment of the present application;Fig. 2 is a first schematic diagram of an assembly structure of a concave plate sievestructure in the embodiment of the present application;Fig. 3 is a second schematic diagram of an assembly structure of a concave plate sievestructure in the embodiment of the present application;Fig. 4 is a second structural schematic diagram of a concave plate sieve structure in theembodiment of the present application;Fig. 5 is a third structural schematic diagram of a concave plate sieve structure in theembodiment of the present application;Fig. 6 is a schematic diagram of a breakdown structure of a concave plate sieve and adrum cover in the embodiment of the present application.Reference numerals:1, frame; 11b, assembly beam; 110b, assembly hole; 111b, positioning pin; 2b, firstconcave plate sieve; 21b, crop feeding opening; 3b, second concave plate sieve; 4b, sideprotecting plate; 41b, steel wire; 5b, connecting beam; 50b, second mounting hole; 501b,positioning hole; 51b, grid bar; 6b, transition opening; 7b, transition plate sieve; 8b,reinforcement rib; 9b, sealing plate; 91b, adjusting plate; 92b, mounting plate; 10b, gap;2a, first drum; 3a, second drum; 2c, first drum cover; 21c, cover body; 22c, mountingframe; 3c, second drum cover; 9c, fastener; 91c, handheld part; 92c, threaded part; 93c,washer.Detailed Description of the EmbodimentsThe technical solutions of the present application will be clearly and completelydescribed below in combination with accompanying drawings, and apparently, the describedembodiments are a part, but not all, of the embodiments of the present application. Based onthe embodiments in the present application, all the other embodiments obtained by thoseskilled in the art without any creative effort shall fall within the protection scope of thepresent application.In the description of the present application, it should be noted that the orientation orpositional relationship indicated by such terms as "center", "top", "bottom", "left", "right","vertical", "horizontal", "inside", "outside" is the orientation or positional relationship basedon the accompanying drawings. Such terms are merely for the convenience of description ofthe present application and simplified description, rather than indicating or implying that thedevice or element referred to must be located in a certain orientation or must be constructed oroperated in a certain orientation, therefore, the terms cannot be understood as a limitation tothe present application. In addition, the terms "first" and "second" are used for descriptivepurposes only and are not to be construed as indicating or implying relative importance.In the description of the present application, it should be noted that, unless otherwisestipulated and defined definitely, such terms as "installed", "connected" and "in connection"should be understood in their broad sense, e.g., the connection can be a fixed connection, adetachable connection or an integral connection; can be mechanical connection or electricalconnection; and can be direct connection or can be indirect connection through anintermediate, and can be communication between two elements. For those skilled in the art,the specific meanings of the above terms in the present application can be understoodaccording to specific conditions.In addition, the technical features involved in different embodiments of the presentapplication described below can be combined with each other as long as they do not constitutea conflict between them.Embodiment 1The present embodiment provides a concave plate sieve structure, as shown in Fig. 2, theconcave plate sieve includes two concave plate sieves, which are respectively a first concaveplate sieve 2b provided with a crop feeding opening 21b and a second concave plate sieve 3bset to be adjacent to the first concave plate sieve 2b in the crop delivery direction, the lengthof the first concave plate sieve 2b is the same as the length of the second concave plate sieve3b, that is, the length of the screening area is the same. The inner sieve surface of eachconcave plate sieve is arc-shaped, and the axes of the two concave plate sieves are parallel toeach other and fixed to the frame 1 at intervals along a horizontal direction.As shown in Fig. 1, each concave plate sieve includes two side protecting plates 4b, twoconnecting beams 5b, a plurality of grid bars 51b, a plurality of steel wires 41b and a pluralityof reinforcement ribs 8b. Two side protecting plates 4b are respectively arc-shaped, the sideprotecting plates 4b are arranged coaxially and opposite to each other, two end parts of thetwo side protecting plates 4b are welded and fixed together through a connecting beam 5b,and the two side protecting plates 4b and the two connecting beams 5b enclose a mountingspace. In the present embodiment, the grid bars 51b are arranged to be in parallel with theconnecting beams 5b and fixed between the two side protecting plates 4b in a spanningmanner, the spacing between adjacent grid bars 51b is the same, and the grid bars 51b arearranged at intervals uniformly along the side protecting plate 4b and are distributed in aradial manner, that is, the plane in which each grid bar 51b is located intersects with the axisof the concave plate sieve, and the center of the arc in which the side protecting plate 4b islocated is located on this axis. A plurality of through holes are formed uniformly at intervalson each grid bar 51b, the steel wire 41b is set to be parallel to the side protecting plate 4b andpasses through the through holes in each grid bar 51b in sequence, and two ends of the steelwire 41b are fixed to the connecting beam 5b or to the grid bar 51b respectively. All the gridbars 51b and steel wires 41b are intersected with each other to form a plurality of grid cells,and all the grid cells together form a grid-like sieve surface. In the present embodiment, thereinforcement ribs 8b are set to be parallel to the side protecting plates 4b and are fixed atintervals to the outer sieve surface. The grid bars 51b are welded and fixed to the sideprotecting plates 4b on both sides, and the reinforcement ribs 8b are also welded and fixed toall the grid bars 51b.In the present embodiment, the separation angles of the first concave plate sieve 2b andthe second concave plate sieve 3b are both 180 degrees, that is, the entire side protecting plate4b is semi-arc shaped. When the separation angle is set to be greater than 180 degrees, thespace on the upper part of the concave plate sieve is wasted, secondly, the upper part is curved,grains are thrown out of the concave plate sieve, and will possibly fall into the concave platesieve again during falling off, thereby influencing the cleaning effect. When the separationangle is set to be smaller than 180 degrees, the area of the sieve surface is reduced, which willalso influence the cleaning effect.In the present embodiment, the area of the grid cell in the first concave plate sieve 2b issmaller than the area of the grid cell in the second concave plate sieve 3b, such that only cropgrains pass through the first concave plate sieve 2b, and the second concave plate sieve issuitable for the passing of grains and other small miscellaneous residues, so as to avoid themiscellaneous residues from entrapping the grains and discharging through a straw outlet,which may cause losses. Specifically, when the spacing between two adjacent grid bars 51b intwo concave plate sieves are the same, the spacing between two adjacent steel wires 41b inthe second concave plate sieve 3b is greater than the spacing between two adjacent steel wires41b in the first concave plate sieve 2b; or, when the spacing between two adjacent steel wires41b in two concave plate sieves is the same, the spacing between two adjacent grid bars 51bin the second concave plate sieve 3b is greater than the spacing between two adjacent gridbars 51b in the first concave plate sieve 2b; or the spacing between adjacent grid bars 51b andadjacent steel wires 41b in the second concave plate sieve 3b is greater than the spacingbetween adjacent grid bars 51b and adjacent steel wires 41b in the first concave plate sieve 2b.Of course, the steels wires 41b in each concave plate sieve can all be drawn out according torequirements, to increase the area of the grid cell.As shown in Fig. 1 again, the two concave plate sieves are respectively formed withtransition openings 6b, and are communicated to each other through the transition openings6b. The transition plate sieve 7b is paved between the two transition openings 6b. Thetransition plate sieve 7b includes a sieve frame, the sieve frame is in a square structure, andthe grid bars 51b are uniformly arranged in the sieve frame at intervals in a horizontaldirection. Similarly, a plurality of through holes are uniformly formed on any grid bar 51b,and the steel wire 41b passes through the through holes on the grid bar 51b in sequence alonga longitudinal direction. Among them, the width direction of the square sieve frame ishorizontal, and the length direction is longitudinal. The crop feeding opening 21b is arrangedon the side, opposite to the transition opening 6b and away from the transition opening 6b, ofthe first concave plate sieve 2b, and the transmission path of the crop from the crop feedingopening 21b into the concave plate sieve is in the shape of Chinese character "ji".As shown in Fig. 2, three assembly beams 11b are arranged at intervals on the frame 1,and the two sides of the first concave plate sieve 2b are overlapped and fixed between the firstand second assembly beams 11b, similarly, the connecting beams 5b on two sides of thesecond concave plate sieve are overlapped and fixed between the second and third assemblybeams 11b. The transition opening 6b is arranged close to one side of the frame 1. Thisstructural design makes the layout of the two concave plate sieves on the harvester frame 1compact and improves the path of the crop through threshing and screening of the concaveplate sieve, thereby greatly improving the overall mobility and threshing effect of theharvester.As shown in Fig. 3, the first drum cover 2c and the first concave plate sieve 2b enclose afirst threshing space, and the first drum 2a is mounted in the first threshing space, and a gapexists between the first concave plate sieve 2b and the end face of the toggle teeth of the firstdrum 2a. The second drum cover 3c and the second concave plate sieve 3b enclose a secondthreshing space, and the second drum 3a is mounted in the second threshing space, with a gapexisting between the second concave plate sieve 3b and the end face of the toggle teeth of thesecond drum 3a. The transition opening 6b communicates the first threshing space and thesecond threshing space, and crops enter the second threshing space from the first threshingspace via the transition plate sieve 7b.As shown in Fig. 4, a limit adjustment structure is arranged at the gap 10b formedbetween the outer sieve surface of the two concave plate sieves and the transition plate sieve,and the limit adjustment structure is detachably fixed to the first concave plate sieve 2b andthe second concave plate sieve 3b on two sides. When the limit adjustment structure is not set,some crops will fall into the lower vibrating sieve from the gap 10b after only passing throughthe first concave plate sieve 2b, and directly enter the subsequent process. When the limitadjustment structure is set, crops will enter the second concave plate sieve 3b from the firstconcave plate sieve 2b through the transition plate sieve 7b, and pass through a completeshape of the Chinese character "ji", the transmission path is longer, and the threshing andscreening effects are better.In the present embodiment, thelimit adjustment structure includes a sealing plate 9b, andthe shape of the sealing plate 9b matches with the shape of the gap 10b. Further, the limitadjustment structure also includes an adjusting member connecting the sealing plate 9b andtwo concave plate sieves. As shown in Figs. 4 and 5, the adjusting member includes anadjusting plate 91b and two mounting plates 92b fixed on two sides of the adjusting plate 91b.The surface of the adjusting plate 91b is in the shape of an arc that matches with the fixedconcave plate sieve. Two mounting plates 92b are bent along the adjusting plate 91b and fixedon two opposite sides of the adjusting plate 91b. One of the mounting plates 92b is configuredto be fixedly connected with the concave plate sieve, and the other mounting plate 92b isconfigured to be fixedly connected with the sealing plate 9b. In the present embodiment, thecross section of the adjusting member is shaped like a Chinese character "fang", and theadjusting plate 91b and the mounting plates 92b on both sides are integrally molded. Thesurface of the adjusting plate 91b is suitable for partially blocking the transition opening 6b,and the adjusting plate 91b can be selected with different widths according to requirements, toadjust the size of the transition opening 6b through which crops pass, thereby partiallyextending the transmission path of crops, and extending the threshing, separating andscreening time of crops.As shown in Fig. 6, the drum cover and the concave plate sieve are buckled together upand down to enclose a hollow cylindrical structure, and the enclosed cavity is suitable formounting a drum. The radian of the cross section of the concave plate sieve and the drumcover is 180 degrees; the concave plate sieve includes an arc-shaped sieve surface andconnecting beams 5b horizontally arranged at both ends of the sieve surface, and theconnecting beams 5b are adapted for being overlapped on the assembly beam 11b of theframe 1. The drum cover includes a square mounting frame 22c and an arc-shaped cover body21c in hinged connection with one frame side of the mounting frame 22c. The mountingframe 22c is adapted for being fit with and overlapped on the assembly beam 11b. A pluralityof groups of locking assemblies are included, and any of the locking assemblies is adapted forpassing through the mounting frame 22c and the connecting beam 5b in sequence and beinglocked and fixed on the assembly beam 11b. In the present embodiment, the radian of thecross section of the concave plate sieve is set to be 180 degrees, which provides the bestscreening and separation angle. When the radian is set to be greater than 180 degrees, theupper space of the concave plate sieve is wasted. Secondly, the upper part is curved, grainsare thrown out of the concave plate sieve, and will possibly fall into the concave plate sieveagain during falling off, thereby influencing the cleaning effect.The connecting beam 5b is set horizontally and can be fit and overlapped with ahorizontal mounting surface of the assembly beam 11b on the frame 1. During mounting, it isonly necessary to put the concave plate sieve between two assembly beams 11b and make theconnecting beam 5b be overlapped on the assembly beam 11b, no palm welding and fixationis required, and a large amount of manpower and material resources are saved.In the present embodiment, the overall structures of the first drum cover 2c and thesecond drum cover 3c are the same, and the dimensions differ according to requirements, forexample, the dimensions of the diameter are different. As shown in Fig. 6, the mountingframe 22c is square, and the cover body 21c is hinged on one frame side of the mountingframe 22c. The frame surface of the mounting frame 22c is adapted for being overlapped andfit with the surface of the mounting beam 5b, thereby facilitating assembly.Again as shown in Fig. 6, the locking assembly includes a fastener 9c and a washer 93c,in the present embodiment, the fastener 9c is made of hexagonal steel, the fastener 9c includesa hexagonal handheld part 91c and a threaded part 92c molded below the handheld part 91c.Correspondingly, the assembling beam 11b is formed with assembly holes 110b that are inthreaded cooperation with the threaded part 92c, a number of first mounting holes (not shownin the figure) are arranged at intervals on the mounting frame 22c along the edge frame, and anumber of second mounting holes 50b are arranged at intervals on the connecting beam 5b,and the first mounting hole, the second mounting hole 50b and the assembly hole 110b arearranged correspondingly. The fastener 9c passes through the first mounting hole and thesecond mounting hole 50b in sequence and is fixed in the assembly hole 110b. A washer 93cis arranged between the mounting frame 22c and the fastener 9c and between the connectingbeam 5b and the assembly beam 11b, and the washer 93c is coaxially sleeved on the threadedpart 92c of the fastener 9c. In the present embodiment, the aperture of the corresponding firstmounting hole is smaller than the aperture of the second mounting hole 50b, so as to correctthe slight misalignment between the concave plate sieve and the drum cover. Further, aninternal thread can be formed in the first mounting hole to cooperate with the external threadof the fastener 9c, so as to increase the locking strength.To improve the mounting accuracy, a positioning assembly is further arranged. Asshown in Fig. 6, the positioning assembly includes at least one positioning pin 111b which isarranged on the assembly beam 11b. In the present embodiment, a positioning pin 111b isarranged at two ends of each assembly beam 11b, and the positioning pin 111b is cylindrical.The connecting beam 5b and the mounting frame 22c are respectively formed withpositioning holes 501b, and the positioning holes 501b are adapted for being sleeved on thecorresponding positioning pins 111b. The apertures of the positioning holes 501b on theconnecting beam 5b and the mounting frame 22c are the same, and both are slightly greaterthan the diameter of the positioning pin 111b, so as to correct the slight misalignment of thefirst mounting hole and the second mounting hole 50b relative to the assembly hole 110b.The concave plate sieve and the drum cover are assembled on the assembly beam 11b ofa harvester frame 1 through a fastener 9c, the structure is simple, the mounting and operationare simple and feasible, and manpower and material resources are saved.Embodiment 2The present embodiment provides a combine harvester, including the concave plate sievestructure of embodiment 1.Obviously, the above embodiments are merely examples for clear description, rather than forlimiting the implementations. For those skilled in the art, other variations or changes ofdifferent forms can be made based on the above description. It is not necessary or possible toenumerate all the implementations herein. The obvious variations or changes derivedtherefrom shall still fall within the protection scope of the present application.

Claims

1. A concave plate sieve structure, characterized by comprising: two concave plate sieves, arranged to be parallel and spaced apart in a horizontal direction, wherein an inner sieve surface of any concave plate sieve is arc-shaped, and the radian of a cross section of the concave plate sieve is 180 degrees; any concave plate sieve comprises connecting beams (5b), arranged horizontally at both ends of the sieve surface; and being adapted for adapted for being overlapped horizontally onto the assembly beam (11b) of a frame (1); a plurality of groups of locking assemblies, wherein any of the locking assemblies is adapted for passing through the connecting beam (5b) and is fixed to the assembly beam (11b) in a locking manner; transition openings (6b) are formed in a radial direction on an end of the same side of the frame on two concave plate sieves; and the two transition openings (6b) are opposite to each other and are interconnected; a transition plate sieve (7b), paved between two concave plate sieves and connecting the two transition openings (6b); a crop feeding opening (21b) is formed on the other end, located opposite to the transition opening (6b) and far away from transition opening (6b), on one of the concave plate sieves; and a limit adjustment structure, detachably arranged at a gap (10b) formed between the outer sieve surface of two concave plate sieves and the transition plate sieve (7b).

2. The concave plate sieve structure of claim 1, characterized in that the limit adjustment structure comprises: a sealing plate (9b), matched with the shape of the gap (10b) and with the two sides being respectively fixed on the two concave plate sieves.

3. The concave plate sieve structure of claim 2, characterized in that the limit adjustment structure further comprises: two adjusting members, wherein the adjusting members are arc-shaped and respectively fixed on two concave plate sieves at two sides of the gap (10b); and two sides of the sealing plate (9b) are respectively fixed on the two adjusting members.

4. The concave plate sieve structure of claim 3, characterized in that any of the adjusting members comprises: an adjusting plate (91b), wherein a plate surface of the adjusting plate is arc-shaped matching with the concave plate sieve to which the plate surface is fixed; and the plate surface of the adjusting plate (91b) is adapted for partially blocking the transition opening (6b); and two mounting plates (92b), arranged in a curved manner along the adjusting plate (91b) and fixed on two opposite sides of the adjusting plate (91b) respectively; wherein one of the mounting plates (92b) is adapted for being fixed on the concave plate sieve and the other mounting plate (92b) is adapted for being fixedly connected to the sealing plate (9b).

5. The concave plate sieve structure of claim 4, characterized in that a cross section of the adjusting member is shaped like a Chinese character "fang".

6. The concave plate sieve structure of any of claims 1-5, characterized in that the locking assembly comprises: a fastener (9c), adapted for passing through a second mounting hole (50b) located on the connecting beam (5b) and fixed in an assembly hole (110b) on the assembly beam (11b); and washers (93c) are arranged between the connecting beam (5b) and the fastener (9c) and between the connecting beam (5b) and the assembly beam (11b); and the washers (93c) are coaxially sleeved onto the fastener (9c).

7. The concave plate sieve structure of claim 6, characterized in that the fasteners (9c) are made of hexagonal steel.

8. The concave plate sieve structure of claim 7, characterized in that the fastener (9c) comprises a hexagonal handheld part (91c) and a threaded part (92c) molded below the handheld part (91c); and the assembly hole (110b) is internally provided with internal threads in cooperation with the threaded part (92c).

9. The concave plate sieve structure of claim 6, characterized by further comprising a positioning assembly; wherein the positioning assembly comprises: at least one positioning pin (111b) arranged on the assembly beam (11b); and a positioning hole (501b) is formed on the connecting beam (5b) and is adapted for being sleeved on the positioning pin (111b).

10. A combine harvester, comprising the integrated assembly structure as claimed in any one of claims 1-9.