Corrugated sieve piece, sieve device and combine harvester

Abstract

The utility model relates to the technical field of harvester screening, in particular to a corrugated screen piece, a screen device and a combine harvester, which comprises a base plate and at least two reinforcing ribs, all the reinforcing ribs are arranged on the screen surface of the base plate in parallel to form at least two peaks and valleys, and the path of materials passing through the screen surface is a corrugated path; when the number of the reinforcing ribs is two, the corrugated screen piece is the double-corrugated screen piece. When the number of the reinforcing ribs is more than two, the corrugated screen piece is the multi-corrugated screen piece; the structural strength of the screen piece can be improved, and the screening capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of harvester screening, in particular to a corrugated screen, a screen device and a combine harvester. Background Art

[0002] Small and medium-sized crawler harvesters have limitations in terms of feed volume, harvesting efficiency, etc.

[0003] Combine harvesters generally use fan-cleaning screen-type cleaning devices. The cleaning system is generally composed of an upper screen component, a lower screen, a tail screen, a finger screen, etc. The upper screen component generally uses a louvered fish-scale screen. The body width of small and medium-sized crawler harvesters is 840mm; for large harvesters with 1000mm and 1100mm wide bodies, 8Kg feed volumes, or even 10Kg and 12Kg feed volumes, the strength of the original structure screen is insufficient due to the inherent material strength of the screen and its structural limitations.

[0004] Disadvantages of existing technology:

[0005] (1) The connecting plate is generally formed by bending a 3mm steel plate. The hardness of the matching fish scale screen connecting rod is about 240HBW. In order to ensure the overall consistency of the screen, the hardness of the connecting rod is lower than that of the connecting plate, resulting in the connecting rod being worn into a "gourd waist", which aggravates the wear.

[0006] (2) The fish scale screen structure is generally suitable for 840mm machine models. If it is used on a widened machine model, the span of the screen will increase dramatically, and the material that needs to be carried may be more than 50%, resulting in insufficient overall strength of the screen and the sieve. Utility Model Content

[0007] The purpose of the utility model is to provide a corrugated screen plate, which can solve at least one disadvantage existing in the background technology.

[0008] Another object of the present invention is to provide a screen device that can solve at least one disadvantage of the background technology.

[0009] Another object of the present invention is to provide a combine harvester that can solve at least one disadvantage of the background technology.

[0010] The technical solution of the utility model is achieved in this way:

[0011] A corrugated screen comprises a base plate and at least two reinforcing ribs, one side of the base plate is a screen surface through which materials pass when being separated, all the reinforcing ribs are arranged on the screen surface of the base plate in parallel to form at least two peaks and valleys, and the path of the materials passing through the screen surface is a corrugated path;

[0012] When the number of the reinforcing ribs is two, the corrugated screen is a double corrugated screen;

[0013] When the number of the reinforcing ribs is more than two, the corrugated screen plate is a multi-corrugated screen plate.

[0014] A sieve device, the sieve device is a shutter-type fish scale sieve, comprising the corrugated sieve plate, and also comprising a connecting plate assembly, the connecting plate assembly comprising an upper connecting plate, a lower connecting plate and a rotating plate, wherein the upper connecting plate is located above the lower connecting plate, and the upper connecting plate is rotatably connected to the lower connecting plate through the rotating plate;

[0015] Connecting plate assemblies are respectively provided at both ends of the base plate, and the length directions of the upper connecting plate and the lower connecting plate are consistent and are both in the first direction, a plurality of the corrugated screens are located between the two connecting plate assemblies and are sequentially arranged along the first direction, the length direction of the base plate is the second direction, and the second direction is perpendicular to the first direction;

[0016] The upper parts at both ends of the base plate are rotatably connected to the upper connecting plates at both sides respectively, and the lower parts at both ends of the base plate are rotatably connected to the lower connecting plates at both sides respectively.

[0017] Furthermore, it also includes connecting rods, and the connecting rods are fixedly arranged at both ends of the base plate, and the ends of the base plate are rotatably connected to the upper connecting plate and the lower connecting plate at the same time through the connecting rods.

[0018] Furthermore, it also includes a locking pin assembly, the locking pin assembly includes a locking pin, the connecting rod is C-shaped, and the two ends of the connecting rod are respectively provided with extension rods, and one of the two extension rods is an upper extension rod and the other is a lower extension rod, and each of the extension rods is provided with a through hole, and the axial direction of the through hole is perpendicular to the axial direction of the extension rod;

[0019] The upper connecting plate is provided with a row of upper through holes along the first direction, and the lower connecting plate is provided with a row of lower through holes along the first direction. The upper extension rod of the connecting rod is passed through the upper through holes, and the lower extension rod is passed through the lower through holes. The locking pin is installed in the through hole of the upper extension rod to axially limit the upper extension rod, and the locking pin is also installed in the through hole of the lower extension rod to axially limit the lower extension rod.

[0020] Furthermore, the locking pin assembly also includes a gasket, which is respectively installed on the upper extension rod and the lower extension rod, and is arranged between the locking pin and the upper connecting plate and between the locking pin and the lower connecting plate.

[0021] Furthermore, the rotating plate is provided with a fulcrum hole and an arc hole, a first bolt assembly is installed in the fulcrum hole, and the upper connecting plate is connected to the first bolt assembly;

[0022] A second bolt assembly is installed in the arc-shaped hole, and the second bolt assembly is connected to the lower connecting plate.

[0023] Furthermore, the upper connecting plate and the lower connecting plate are respectively made of nylon material and are integrally injection molded, or the outer parts of the upper connecting plate and the lower connecting plate are respectively covered with nylon sleeves.

[0024] Furthermore, the overall width of the sieve device ranges from 600 to 1500 mm.

[0025] Furthermore, the overall width of the sieve device is 1100 mm.

[0026] A combine harvester comprises a machine body and a screen box arranged on the machine body, and also comprises the screen device, wherein the screen device is connected to the screen box through the upper connecting plate.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] The present application provides a corrugated screen plate, which is applied to a louver-type fish scale screen. At least two reinforcing ribs on a base plate form at least two peaks and valleys. When the material is separated, it will pass through the peaks and valleys formed on the screen surface, so that the path of the material is a corrugated path. For the entire screen, this screen plate structure enables better material screening capabilities and stronger separation capabilities. From the perspective of the material mechanical properties of the screen plate, due to the design of the reinforcing ribs, the cross-section of the screen plate is more complex, the overall bending resistance of the screen plate is better, and the screen plate structure strength is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the structure of the corrugated screen of the utility model (shown is a double corrugated screen);

[0031] Figure 2 It is a three-dimensional diagram of the upper connecting plate of the utility model;

[0032] Figure 3 This is a front view of the upper connecting plate of the utility model;

[0033] Figure 4 This is a front view of the lower connecting plate of the utility model;

[0034] Figure 5 It is a three-dimensional diagram of the screen device of the utility model;

[0035] Figure 6 It is a structural schematic diagram of the locking pin assembly installed on the lower extension rod of the utility model.

[0036] In the figure:

[0037] 1-corrugated screen; 101-base plate; 102-screen surface; 103-reinforcement ribs;

[0038] 2-upper connecting plate; 201-upper through hole; 202-mounting hole;

[0039] 3-lower connecting plate; 301-lower perforation;

[0040] 4-connecting rod; 401-upper extension rod; 402-lower extension rod;

[0041] 501-locking pin; 502-gasket. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0046] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0049] Example 1

[0050] like Figure 1 The present embodiment provides a corrugated screen plate 1, comprising a base plate 101 and at least two reinforcing ribs 103, one side of the base plate 101 being a screen surface 102 through which materials pass when being separated, and all the reinforcing ribs 103 being arranged on the screen surface 102 of the base plate 101 in parallel with each other to form at least two peaks and valleys, so that the path of the material passing through the screen surface 102 is a corrugated path.

[0051] When the number of the reinforcing ribs 103 is two, the corrugated screen plate 1 is the double corrugated screen plate; when the number of the reinforcing ribs 103 is more than two, the corrugated screen plate 1 is the multi-corrugated screen plate. The corrugated screen plate 1 in this embodiment is preferably a double corrugated screen plate.

[0052] The corrugated screen 1 is applied to a louver-type fish scale screen. At least two reinforcing ribs 103 arranged on the base plate 101 form at least two peaks and valleys. When the material is separated, it will pass through the peaks and valleys formed on the screen surface 102, so that the path of the material is a corrugated path or a serpentine path. For the entire screen, this screen structure enables better material screening ability and stronger separation ability. From the material mechanical properties of the screen, due to the design of the reinforcing ribs 103, the cross-section of the screen is more complex, the overall bending resistance of the screen is better, and the strength of the screen is higher.

[0053] Example 2

[0054] like Figure 2-Figure 6 A sieve device, which is a louver-type fish scale sieve, includes the corrugated sieve plate 1 and a connecting plate assembly, wherein the connecting plate assembly includes an upper connecting plate 2, a lower connecting plate 3 and a rotating plate, wherein the upper connecting plate 2 is located above the lower connecting plate 3, and the upper connecting plate 2 is rotatably connected to the lower connecting plate 3 through the rotating plate.

[0055] The two ends of the base plate 101 are respectively provided with connecting plate components, and the upper connecting plate 2 and the lower connecting plate 3 are respectively long strip-shaped structures, such as Figure 3 and Figure 4 As shown, the length directions of the upper connecting plate 2 and the lower connecting plate 3 are consistent and are both in the first direction, the multiple corrugated screen plates 1 are located between the two connecting plate assemblies and are arranged in sequence along the first direction, the base plate 101 is also a long strip plate structure, and the length direction of the base plate 101 is the second direction, and the second direction is perpendicular to the first direction.

[0056] The upper parts of both ends of the base plate 101 are rotatably connected to the upper connecting plates 2 on both sides, and the lower parts of both ends of the base plate 101 are rotatably connected to the lower connecting plates 3 on both sides.

[0057] Specifically, the sieve device further includes a connecting rod 4, and the connecting rods 4 are respectively fixedly arranged at both ends of the base plate 101. Preferably, the connecting rod 4 is welded to the surface of the base plate 101. The ends of the base plate 101 are rotatably connected to the upper connecting plate 2 and the lower connecting plate 3 through the connecting rod 4.

[0058] Preferably, the sieve device further comprises a locking pin assembly, the locking pin assembly comprises a locking pin 501, the connecting rod 4 is C-shaped, and extension rods are respectively arranged at both ends of the connecting rod 4, the extension rods are part of the connecting rod 4, the extension rods are welded and fixed to the main body of the connecting rod 4 or are an integrally formed structure, for the convenience of distinction, one of the two extension rods on the connecting rod 4 is an upper extension rod 401, and the other is the lower extension rod 402, the upper extension rod 401 is for connecting the upper connecting plate 2, and the lower extension rod 402 is for connecting the lower extension rod 402. A through hole is provided on each extension rod, and the axial direction of the through hole is perpendicular to the axial direction of the extension rod.

[0059] Preferably, the axial direction of the extension rod is the second direction, which is consistent with the length direction of the substrate 101 .

[0060] The upper connecting plate 2 has a row of upper through holes 201 along the first direction, and the number of the upper through holes 201 is not less than the number of the corrugated screen plates 1 . The lower connecting plate 3 has a row of lower through holes 301 along the first direction, and the number of the lower through holes 301 is not less than the number of the corrugated screen plates 1 .

[0061] When the corrugated screen plate 1 is actually assembled, the connecting rods 4 at both ends of the corrugated screen plate 1 are respectively connected to the connecting plate assemblies on both sides (the connection method of the corrugated screen plate 1 and the connecting plate assemblies on both sides is consistent). Specifically, the upper extension rod 401 of the connecting rod 4 on each corrugated screen plate 1 is inserted into the upper through hole 201 of the upper connecting plate 2, and the lower extension rod 402 is inserted into the lower through hole 301 of the lower connecting plate 3, so that the through hole on the upper extension rod 401 exceeds the upper through hole 201, and the through hole on the lower extension rod 402 exceeds the lower through hole 301, that is, the upper through hole 201 and the lower through hole 301 are respectively located between the base plate 101 and the through hole. Then, the locking pin 501 is installed in the through hole of the upper extension rod 401 to limit the axial position of the upper extension rod 401, and the locking pin 501 is also installed in the through hole of the lower extension rod 402 to limit the axial position of the lower extension rod 402. The lock pin 501 is a cotter pin.

[0062] Preferably, the locking pin assembly further comprises a gasket 502, the gasket 502 is respectively mounted on the upper extension rod 401 and the lower extension rod 402, and the gasket 502 is arranged between the locking pin 501 and the upper connecting plate 2, and between the locking pin 501 and the lower connecting plate 3 (such as Figure 6 What is shown is a schematic diagram of the structure of installing the locking pin assembly on the lower extension rod 402. The method of installing the locking pin assembly on the upper extension rod 401 is the same and will not be shown again).

[0063] The upper connecting plate 2 is rotatably connected to the lower connecting plate 3 through the rotating plate. Specifically, the rotating plate is provided with a fulcrum hole and an arc hole, a first bolt assembly is installed in the fulcrum hole, and the upper connecting plate 2 is connected to the first bolt assembly; a second bolt assembly is installed in the arc hole, and the second bolt assembly is connected to the lower connecting plate 3. The first bolt assembly and the second bolt assembly both include matching bolts and nuts.

[0064] After the first bolt assembly is installed in the fulcrum hole, the rotating plate and the upper connecting plate 2 are fixed by bolt connection at the same time.

[0065] After the second bolt assembly is installed in the arc-shaped hole, the rotating plate and the lower connecting plate 3 are fixed by bolt connection at the same time.

[0066] When the angle of the corrugated screen plate 1 needs to be adjusted, the first bolt assembly and the second bolt assembly are loosened, and the position of the second bolt assembly in the arc hole is adjusted with the first bolt assembly as a fulcrum. It should be noted that the number of the second bolt assembly in the arc hole can be set to at least one.

[0067] In this embodiment, the upper connecting plate 2 and the lower connecting plate 3 are respectively made of nylon and are integrally injection molded, or the outer surfaces of the upper connecting plate 2 and the lower connecting plate 3 are respectively covered with nylon sleeves. The upper connecting plate 2 and the lower connecting plate 3 made of nylon can be injection molded, and the parts have high precision and good surface finish. The nylon material has self-lubricating properties, which makes the parts operate flexibly and reduces the wear of the two ends of the connecting rod 4 and the upper connecting plate 2 and the lower connecting plate 3. Similarly, when the outer surfaces of the upper connecting plate 2 and the lower connecting plate 3 are respectively covered with nylon sleeves, the above technical effects are also achieved.

[0068] In addition, when the upper connecting plate 2 and the lower connecting plate 3 are injection molded using nylon material, multiple pieces can be injection molded simultaneously, and the production efficiency is high.

[0069] In this embodiment, the overall width of the sieve device ranges from 600 to 1500 mm. Preferably, through multiple test results, the overall width of the sieve device is designed to be 1100 mm, at which time the screening effect is better and the adaptability is stronger, and it can adapt to the installation of various large, small and medium-sized harvester models, and the design of at least two reinforcing ribs 103 on each corrugated screen plate 1 can also improve the structural strength of the screen body, improve the material carrying capacity, and can adapt to the widened body, even if the span of the screen plate is sharply increased, it can also be well competent.

[0070] Example 3

[0071] This embodiment provides a sieve device, which is extended on the basis of the embodiment 2, and the difference from the embodiment 2 is that the structure of the connection between the connecting rod 4 and the upper connecting plate 2 and the lower connecting plate 3 is different. The details are as follows:

[0072] In this embodiment, the connecting rod 4 is C-shaped, and extension rods are respectively arranged at both ends of the connecting rod 4, and one of the two extension rods is an upper extension rod 401, and the other is the lower extension rod 402; the difference is: a row of rotating seats is arranged along the first direction on the upper connecting plate 2, and a row of rotating seats is also arranged along the first direction on the lower connecting plate 3, and the upper extension rod 401 on the connecting rod 4 is respectively inserted into the rotating seat of the upper connecting plate 2, and the lower extension rod 402 is inserted into the rotating seat of the lower connecting plate 3, so as to realize the rotation connection between the corrugated screen 1 and the upper connecting plate 2 and the lower connecting plate 3.

[0073] Example 4

[0074] This embodiment provides a sieve device, which is extended on the basis of the embodiment 2, and the difference from the embodiment 2 is that the structure of the connection between the connecting rod 4 and the upper connecting plate 2 and the lower connecting plate 3 is different. The details are as follows:

[0075] The connecting rod 4 is C-shaped, and the two ends of the connecting rod 4 are respectively provided with extension rods, and one of the two extension rods is an upper extension rod 401, and the other is a lower extension rod 402, each of the extension rods is provided with a through hole, and the axial direction of the through hole is perpendicular to the axial direction of the extension rod; the upper connecting plate 2 is provided with a row of upper through holes 201 along the first direction, and the lower connecting plate 3 is provided with a row of lower through holes 301 along the first direction; the difference is: the upper extension rod 401 is provided with a plurality of upper through holes 201, and the lower connecting plate 3 is provided with a plurality of lower through holes 301. The upper through hole 201 is penetrated, and the through hole thereof exceeds the upper through hole 201, so that the upper through hole 201 is located between the through hole and the base plate 101. The upper extension rod 401 is provided with an external threaded portion, and a nut is installed on the external threaded portion to axially limit the upper extension rod 401; at the same time, the lower extension rod 402 is penetrated by the lower through hole 301, and the lower extension rod 402 is also provided with an external threaded portion, and a nut is installed on the external threaded portion to axially limit the lower extension rod 402. Through this structural design, the rotation between the corrugated screen 1 and the upper connecting plate 2 and the lower connecting plate 3 can still be satisfied.

[0076] Example 5

[0077] A combine harvester includes a machine body and a screen box arranged on the machine body, and also includes the screen device described in any one of Examples 2-4, wherein the screen device is connected to the screen box through the upper connecting plate 2. Specifically: there is a bend in the middle of the upper connecting plate 2, and a row of upper through holes 201 is arranged at the lower part of the upper connecting plate 2, and a plurality of mounting holes 202 are arranged at the upper part of the upper connecting plate 2 for establishing a connection with the screen box. It should be noted that the screen box and the screen device are cleaning devices.

[0078] The beneficial effects of the technical solution of the utility model are:

[0079] 1. At least two reinforcing ribs 103 arranged on the base plate 101 form at least two peaks and valleys. When the material is separated, it will pass through the peaks and valleys formed on the screen surface 102, so that the path of the material is a corrugated path or a serpentine path. For the entire sieve, this screen structure enables better screening ability and stronger separation ability of the material.

[0080] 2. From the perspective of the material mechanical properties of the screen plate, the design of the reinforcing ribs 103 makes the cross section of the screen plate more complex, the overall bending resistance of the screen plate is better, and the strength of the screen plate is higher.

[0081] 3. In the prior art, the upper connecting plate 2 and the lower connecting plate 3 are made of steel. In the present application, the upper connecting plate 2 and the lower connecting plate 3 are respectively made of nylon and are integrally injection molded. The production can be injection molded in multiple pieces at the same time, with high production efficiency, high precision of parts, good surface finish, and the self-lubricating property of nylon, which makes the parts operate flexibly and reduces the wear of the two ends of the connecting rod 4 and the upper connecting plate 2 and the lower connecting plate 3. Similarly, when the outer surfaces of the upper connecting plate 2 and the lower connecting plate 3 are respectively covered with nylon sleeves, the above technical effects are also achieved.

[0082] 4. The overall width of the sieve device is designed to be 1100 mm. At this time, the screening effect is better and the adaptability is stronger. It can adapt to the installation of various large, small and medium-sized harvester models. The design of at least two reinforcing ribs 103 on each corrugated screen plate 1 can also improve the structural strength of the screen body, improve the material carrying capacity, and can adapt to the widened body. Even if the span of the screen plate increases sharply, it can still do a good job.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0084] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A corrugated screen plate (1), characterized in that: It comprises a base plate (101) and at least two reinforcing ribs (103), one side of the base plate (101) being a screen surface (102) through which materials pass when being separated, all the reinforcing ribs (103) being arranged on the screen surface (102) of the base plate (101) in parallel to each other to form at least two peaks and valleys, and the path through which the materials pass through the screen surface (102) is a corrugated path; When the number of the reinforcing ribs (103) is two, the corrugated screen plate (1) is a double corrugated screen plate; When the number of the reinforcing ribs (103) is two or more, the corrugated screen plate (1) is a multi-corrugated screen plate.

2. A sieve device, the sieve device is a shutter-type fish scale sieve, characterized in that: The corrugated screen plate (1) according to claim 1 further comprises a connecting plate assembly, wherein the connecting plate assembly comprises an upper connecting plate (2), a lower connecting plate (3) and a rotating plate, wherein the upper connecting plate (2) is located above the lower connecting plate (3), and the upper connecting plate (2) is rotatably connected to the lower connecting plate (3) via the rotating plate; Connecting plate assemblies are respectively arranged at both ends of the base plate (101), and the length directions of the upper connecting plate (2) and the lower connecting plate (3) are consistent and are both in a first direction, a plurality of the corrugated screens (1) are located between the two connecting plate assemblies and are arranged in sequence along the first direction, and the length direction of the base plate (101) is a second direction, and the second direction is perpendicular to the first direction; The upper parts at both ends of the base plate (101) are rotatably connected to the upper connecting plates (2) at both sides, and the lower parts at both ends of the base plate (101) are rotatably connected to the lower connecting plates (3) at both sides.

3. The sieve device according to claim 2, characterized in that It also comprises connecting rods (4), the connecting rods (4) being fixedly arranged at both ends of the base plate (101), and the ends of the base plate (101) are rotatably connected to the upper connecting plate (2) and the lower connecting plate (3) via the connecting rods (4).

4. The sieve device according to claim 3, characterized in that It also includes a locking pin assembly, the locking pin assembly includes a locking pin (501), the connecting rod (4) is C-shaped, and extension rods are respectively arranged at the two ends of the connecting rod (4), and one of the two extension rods is an upper extension rod (401) and the other is a lower extension rod (402), and each of the extension rods is provided with a through hole, and the axial direction of the through hole is perpendicular to the axial direction of the extension rod; The upper connecting plate (2) is provided with a row of upper through holes (201) along the first direction, and the lower connecting plate (3) is provided with a row of lower through holes (301) along the first direction. The upper extension rod (401) of the connecting rod (4) is passed through the upper through hole (201), and the lower extension rod (402) is passed through the lower through hole (301). The locking pin (501) is installed in the through hole of the upper extension rod (401) to axially limit the upper extension rod (401), and the locking pin (501) is also installed in the through hole of the lower extension rod (402) to axially limit the lower extension rod (402).

5. The sieve device according to claim 4, characterized in that The locking pin assembly also includes a gasket (502), the gasket (502) being respectively mounted on the upper extension rod (401) and the lower extension rod (402), and the gasket (502) being arranged between the locking pin (501) and the upper connecting plate (2), and between the locking pin (501) and the lower connecting plate (3).

6. The sieve device according to claim 2, characterized in that The rotating plate is provided with a fulcrum hole and an arc-shaped hole, a first bolt assembly is installed in the fulcrum hole, and the upper connecting plate (2) is connected to the first bolt assembly; A second bolt assembly is installed in the arc-shaped hole, and the second bolt assembly is connected to the lower connecting plate (3).

7. The sieve device according to claim 3, characterized in that The upper connecting plate (2) and the lower connecting plate (3) are respectively made of nylon and are integrally injection-molded, or the exterior of the upper connecting plate (2) and the lower connecting plate (3) are respectively covered with nylon sleeves.

8. The sieve device according to claim 2, characterized in that The overall width of the sieve device ranges from 600 to 1500 mm.

9. The sieve device according to claim 8, characterized in that The overall width of the sieve device is 1100 mm.

10. A combine harvester, comprising a machine body and a screen box arranged on the machine body, characterized in that: It also comprises the screen device according to any one of claims 2 to 9, wherein the screen device is connected to the screen box via the upper connecting plate (2).

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