Screen box of harvester and harvester

Abstract

The utility model relates to the technical field of harvesters, in particular to a harvester screen box and a harvester, the harvester screen box comprises a box body, a front vibration plate, a rear vibration part and a screening assembly, the front vibration plate, the rear vibration part and the screening assembly are arranged in the box body, and the front vibration plate and the rear vibration part are arranged in a spaced mode in the first preset direction; in the second preset direction, the screening assembly is arranged below the front vibrating plate and the rear vibrating part; a plurality of pre-screening holes are formed in the rear vibration piece. Therefore, the multiple pre-screening holes are formed in the rear vibration piece, materials such as grain straw can be shaken to be scattered and can also be pre-screened when passing through the rear corrugated plate structure with the pre-screening holes, compared with the structure before improvement, the materials such as the grain straw fall onto the upper screen of the screening mechanism in advance, the screening penetrating rate is increased, and the screening efficiency is improved. Screening gaps are not prone to being blocked, the screening efficiency is higher, the number of grains discharged out of the screening box and the number of impurities falling into the screening box are reduced, and secondary separation of materials such as grain straw is more sufficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of harvesting machines, in particular to a sieve box of a harvesting machine and the harvesting machine. BACKGROUND

[0002] At present, a semi-feeding harvesting machine includes a threshing device, the threshing device includes a threshing mechanism and a sieve box, the sieve box is arranged below the threshing mechanism, the threshing mechanism performs threshing treatment on crops, and then the crops are discharged to the sieve box below through an outlet at the bottom with a sieve screen, and the sieve box is provided with a vibrating plate and a sieve screen from top to bottom, the vibrating plate includes front and rear vibrating plates arranged in a horizontal direction and spaced apart, and a gap is formed between the front and rear vibrating plates, and there are some problems in the current structure, part of the larger crops treated by the threshing device will fall on the rear vibrating plate for secondary separation, the rear vibrating plate can only shake the materials, the separation position of the grains and the straws is rear, the crop screening area is small, the grains are easy to be discharged from the sieve box, the loss rate is increased, or the grains fall into the residue stirring dragon, and the breakage rate risk is increased. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to provide a sieve box of a harvesting machine and the harvesting machine, which solves the technical problem that the rear vibrating plate of the sieve box can only shake the materials, the separation position of the grains and the straws is rear, the crop screening area is small, the grains are easy to be discharged from the sieve box, the loss rate is increased, or the grains fall into the residue stirring dragon, and the breakage rate risk is increased.

[0004] The present application provides a sieve box of a harvesting machine, which includes a box body and front and rear vibrating plates and a screening assembly arranged in the box body, wherein the front and rear vibrating plates are sequentially and spaced apart along a first preset direction, and a gap is formed between the front and rear vibrating plates for the passage of materials.

[0005] The screening assembly is arranged below the front and rear vibrating plates along a second preset direction, and is used for screening the materials shaken and fallen by the front and rear vibrating plates; and the rear vibrating plate is formed with a plurality of pre-screening holes.

[0006] In the above technical solution, further, the plurality of pre-screening holes are arranged in an array along the first and third preset directions.

[0007] In any of the above technical solutions, further, along the first preset direction, any two adjacent columns of the pre-screening holes are staggered.

[0008] Along the third preset direction, any two adjacent rows of the pre-screening holes are staggered.

[0009] In any of the above technical solutions, further, the rear vibrating plate is a corrugated plate.

[0010] In any of the above technical solutions, further, along the first preset direction, one of any two adjacent rows of the pre-screening holes is located at a trough position of the rear vibrating member, and the other is located at a crest position of the rear vibrating member.

[0011] In any of the above technical solutions, further, the pre-screening hole is a waist-shaped hole with the same length direction as the first preset direction.

[0012] In any of the above technical solutions, further, the front vibrating plate is a corrugated plate.

[0013] In any of the above technical solutions, further, the rear vibrating member comprises a support frame, an upper connecting plate, a lower connecting plate, a tooth plate assembly, an adjusting assembly and a locking assembly; the support frame is fixedly connected with the inner wall of the box body, and the tooth plate assembly, the upper connecting plate and the lower connecting plate are all arranged in the support frame; the tooth plate assembly comprises a plurality of tooth plates arranged in sequence and at intervals; the number of the upper connecting plates is two, and each is arranged on the opposite side of the tooth plate assembly along the length direction of the tooth plate; each of the upper connecting plates is fixed on the support frame; the opposite sides of the tooth plate are each formed with an upper rotary connecting portion, and the upper connecting plates on the two sides are each formed with an upper auxiliary mounting through hole, and the upper rotary connecting portion is rotatably inserted in the corresponding upper auxiliary mounting through hole, and one of the upper rotary connecting portions is formed with a plug-in slot; the number of the lower connecting plates is two, and each is arranged on the opposite side of the tooth plate assembly along the length direction of the tooth plate, and each of the tooth plates is rotatably connected with the lower connecting plates on the two sides;

[0014] The adjusting assembly is mounted on the support frame and connected with one of the upper rotary connecting portions, for synchronously adjusting the rotation angle of all the tooth plates;

[0015] The locking assembly is used for locking the adjusting assembly, so as to lock the posture of all the tooth plates.

[0016] In any of the above technical solutions, further, the adjusting assembly comprises an adjusting plate arranged on the outer side of the support frame away from the upper connecting plate, the adjusting plate is formed with a plug-in protruding portion, the support frame and the corresponding upper connecting plate are each formed with a mounting through hole, the plug-in protruding portion is rotatably inserted in the mounting through hole, and the end of the plug-in protruding portion can pass through the mounting through hole and be plugged together with the plug-in slot, the adjusting plate can drive the tooth plate connected therewith to rotate, and then the remaining tooth plates are synchronously rotated by the lower connecting plate, so as to adjust the angle of the tooth plate.

[0017] In any of the above technical solutions, further, the locking assembly comprises a locking bolt and a locking nut; wherein the adjusting plate is formed with an arc-shaped through hole, and the arc-shaped through hole is arranged with the mounting through hole as the center; correspondingly, the upper connecting plate is formed with a threaded hole, the locking bolt is mounted in the arc-shaped through hole and the threaded hole, and is locked by the locking nut abutting against the side of the adjusting plate away from the upper connecting plate.

[0018] The application also provides a harvester comprising the sieve box of the harvester according to any of the above technical solutions, thus having all the beneficial technical effects of the sieve box of the harvester, which will not be described herein again.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] In the sieve box of the harvester provided by the application, a plurality of pre-screening holes are arranged on the rear vibrating member, and the material such as grain and straw can be shaken and scattered, and pre-screened through the rear vibrating member structure with the pre-screening holes. Compared with the structure before the improvement, the material such as grain and straw falls onto the upper sieve of the screening mechanism in advance, the sieve rate is increased, the screening gap is less likely to be blocked, the screening efficiency is higher, the grain falling into the sieve box and the grain falling into the waste are reduced, and the secondary separation of the material such as grain and straw is more sufficient. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 A structural schematic view of the rear vibrating member provided by Embodiment One of the application;

[0023] Figure 2 Another structural schematic view of the rear vibrating member provided by Embodiment One of the application;

[0024] Figure 3 A partial structural schematic view of the sieve box of the harvester provided by Embodiment One of the application;

[0025] Figure 4 A structural schematic view of the rear vibrating member provided by Embodiment Two of the application;

[0026] Figure 5 A structural schematic view of the rear vibrating member provided by Embodiment Two of the application; Figure 4 A sectional view along the A-A section;

[0027] Figure 6 A structural schematic view of the rear vibrating member provided by Embodiment Two of the application;Figure 4 The left view;

[0028] Figure 7 This is a partial structural schematic diagram of the rear vibration element provided in Embodiment 2 of this application;

[0029] Figure 8 This is another partial structural schematic diagram of the rear vibrating element provided in Embodiment 2 of this application;

[0030] Figure 9 This is another partial structural schematic diagram of the rear vibration element provided in Embodiment 2 of this application;

[0031] Figure 10 This is another structural schematic diagram of the rear vibration component provided in Embodiment 2 of this application.

[0032] Figure label:

[0033] 1-Rear vibrating component, 101-Pre-screening hole, 2-Screening assembly, 3-Upper connecting plate, 4-Adjusting plate, 41-Arc-shaped through hole, 42-Insertion protrusion, 5-Toothed plate, 51-Rotating connecting part, 511-Insertion groove, 6-Finger screen, 7-Front vibrating plate, 8-Wave-shaped pressure plate, 9-Support frame, 91-Mounting through hole, 10-Locking nut, 11-Lower connecting plate, a-First preset direction, b-Second preset direction, c-Third preset direction. Detailed Implementation

[0034] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0035] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0036] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] Reference will now be made to Figures 1 to 10 The screen box of the harvester and the harvester according to some embodiments of the present application are described.

[0040] Embodiment one

[0041] Referring to Figures 1 to 3 As shown in the drawings, the embodiments of the present application provide a screen box of a harvester, comprising: a box body and a front vibrating plate 7, a rear vibrating piece 1 and a screening assembly 2 arranged in the box body; wherein the front vibrating plate 7 and the rear vibrating piece 1 are sequentially and spaced apart along a first predetermined direction a, and a pass-through opening is formed between the two for the material to pass through; along a second predetermined direction b, the screening assembly 2 is arranged below the front vibrating plate 7 and the rear vibrating piece 1, and is used for screening the material falling after being shaken by the front vibrating plate 7 and the rear vibrating piece 1; the rear vibrating piece 1 is formed with a plurality of pre-screening holes 101 penetrating through both sides thereof along the second predetermined direction b.

[0042] According to the above-described structure, in the present application, a plurality of pre-screening holes 101 are arranged on the rear vibrating piece 1, and the material such as grain and straw passes through the rear vibrating piece 1 structure with pre-screening holes 101, that is, the material can be shaken and the grain and straw can be pre-screened, and compared with the structure before the improvement, the material such as grain and straw falls on the upper screen of the screening mechanism in advance, the screen penetration rate increases, the screening gap is less likely to be blocked, the screening efficiency is higher, the grain falling into the screen box and the grain falling into the waste is reduced, and the secondary separation of the material such as grain and straw is more sufficient.

[0043] Further, from Figure 1 and Figure 2As can be seen, the end of the rear vibrating member 1 connected with the finger screen 6 is not provided with the pre-screening hole 101.

[0044] Further, preferably, the first preset direction a is the length direction of the harvester, i.e. the length direction of the box body, for example, the X-axis direction in the horizontal plane; the second preset direction b is the height direction of the harvester, i.e. the height direction of the box body, for example, the vertical direction; the third preset direction c described below is the width direction of the harvester, i.e. the width direction of the box body, for example, the Y-axis direction in the horizontal plane, and the first preset direction a and the third preset direction c are both arranged perpendicularly to the second preset direction b. The above is exemplified, of course, the first preset direction a, the second preset direction b and the third preset direction c can also be designed according to actual needs, not limited to the above.

[0045] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , the plurality of pre-screening holes 101 are arranged in an array along the first preset direction a and the third preset direction c, that is, the plurality of pre-screening holes 101 are arranged in an array along the X-axis direction and the Y-axis direction in the horizontal plane.

[0046] According to the structure described above, the plurality of pre-screening holes 101 are designed to be arranged in an array, which is more uniform and regular in distribution, and can further improve the screening effect, of course, the plurality of pre-screening holes 101 can also be arranged according to other rules, which is selected according to actual needs.

[0047] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , along the first preset direction a, any two adjacent columns of pre-screening holes 101 are staggered;

[0048] along the third preset direction c, any two adjacent rows of pre-screening holes 101 are staggered.

[0049] According to the structure described above, whether it is the two adjacent columns of pre-screening holes 101 or the two adjacent rows of pre-screening holes 101, they are staggered, which can improve the uniformity of the arrangement of the pre-screening holes 101 and the screening area, and further improve the screening effect.

[0050] It should be noted that the plurality of pre-screening holes 101 arranged in an array can also not be limited to being arranged according to the above staggered arrangement, but can also be designed according to actual needs.

[0051] In this embodiment, preferably, as shown in Figure 1 , the rear vibrating member 1 is a corrugated plate.

[0052] According to the above-described structure, the rear vibrating member 1 adopts the structure of the corrugated plate, which greatly improves the effect of material shaking and screening.

[0053] Of course, the structure of the rear vibrating member 1 is not limited to the structure of the corrugated plate, and other shaped plate members, such as flat plate members, etc., can also be adopted, which is selected according to actual needs.

[0054] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , along the first preset direction a, any two adjacent rows of pre-screening holes 101 are located at the valley position of the rear vibrating member 1, and the other row is located at the peak of the rear vibrating member 1.

[0055] According to the above-described structure, the pre-screening holes 101 are arranged at the peak and valley positions of the corrugated rear vibrating member 1, that is, the pre-screening holes 101 are arranged at the positions where the vibration is the largest, which greatly improves the screening effect and ensures the uniformity of the distribution of the pre-screening holes 101, thereby improving the screening effect, especially when the pre-screening holes 101 are arranged at the valley, which avoids the accumulation of materials at the valley and the failure of the materials to fall.

[0056] It should be noted that the pre-screening holes 101 arranged at the valley position of the rear vibrating member 1 and the peak position of the rear vibrating member 1 are preferably structures extending to both sides with the valley position and the peak position as the center.

[0057] In addition, it should be noted that the design position of the pre-screening holes 101 is not limited to the above, and can be designed according to actual needs.

[0058] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , the pre-screening holes 101 are waist-shaped holes with the same length direction as the first preset direction a.

[0059] According to the above-described structure, the waist-shaped pre-screening holes 101 have a large passage area compared with the circular holes, are not easy to block, and belong to the extension along the propagation direction of the wave of the rear vibrating member 1, i.e., the corrugated plate, which improves the screening effect and is convenient for processing and manufacturing.

[0060] It should be noted that the shape of the pre-screening holes 101 is not limited to the above, and can be designed according to actual needs, for example, the pre-screening holes 101 can also be circular holes, etc.

[0061] In this embodiment, preferably, as shown in Figure 3 , the front vibrating plate 7 is a corrugated plate.

[0062] According to the above-described structure, the front vibrating plate 7 adopts the structure of the corrugated plate, which greatly improves the effect of material shaking and screening.

[0063] Of course, the structure of the front vibration plate 7 is not limited to the corrugated plate structure, and other shaped plate members, such as flat plate members, etc., can also be used, and the specific selection is based on actual needs.

[0064] It should be noted that the aforementioned screening assembly 2 is a conventional structure on the existing harvester, which includes an upper screen and a lower screen, etc., and will not be described in detail here.

[0065] In addition, it should be noted that in this embodiment, the screen box of the harvester also includes a wave-shaped pressing plate 8 and a plurality of finger-shaped screens 6, which are connected to one side of the corrugated plate through the wave-shaped pressing plate 8, and the wave-shaped pressing plate is connected to the corrugated plate by welding. This part belongs to the existing structure, and will not be described in detail here.

[0066] Example Two

[0067] Referring to Figures 4 to 9 The harvester in this embodiment is an improvement based on Example One, and the technical content disclosed in Example One will not be repeated. The content disclosed in Example One also belongs to the content disclosed in this embodiment.

[0068] In this embodiment, preferably, as Figures 4 to 10 The rear vibration member 1 includes a support frame 9, an upper connecting plate 3, a lower connecting plate 11, a tooth plate assembly, an adjusting assembly, and a locking assembly. The support frame 9 is fixedly connected to the inner wall of the box body, and the tooth plate assembly, the upper connecting plate 3, and the lower connecting plate 11 are all arranged in the support frame 9. The tooth plate assembly includes a plurality of tooth plates 5 arranged in sequence and at intervals. The number of the upper connecting plates 3 is two, and they are arranged on opposite sides of the tooth plate assembly along the length direction of the tooth plate 5. The upper connecting plates 3 are fixed in the support frame 9. The opposite sides of the tooth plate 5 are both formed with upper rotary connecting parts 51, and the upper connecting plates 3 on both sides are both formed with upper auxiliary mounting through holes. The upper rotary connecting parts 51 are rotatably inserted into the corresponding upper auxiliary mounting through holes, and one of the upper rotary connecting parts 51 is formed with a plug-in slot 511. The number of the lower connecting plates 11 is two, and they are arranged on opposite sides of the tooth plate assembly along the length direction of the tooth plate 5. Any tooth plate 5 is rotatably connected with the lower connecting plates 11 on both sides.

[0069] The adjusting assembly is installed on the support frame 9 and connected with one of the upper rotary connecting parts 51, and is used for synchronously adjusting the rotation angles of all the tooth plates 5.

[0070] The locking assembly is used for locking the adjusting assembly, so as to lock the postures of all the tooth plates 5.

[0071] According to the above-described structure, the embodiment provides a tooth plate structure which can not only shake and scatter materials, but also pre-screen the grains and straws, and compared with the structure before the improvement, the materials such as the grains and straws fall on the upper screen of the screening mechanism in advance, the screening rate is increased, the screening gap is less likely to be blocked, the screening efficiency is higher, the grains falling into the waste are reduced, and the secondary separation of the materials such as the grains and straws is more sufficient.

[0072] Further, preferably, the adjusting assembly comprises an adjusting plate 4 which is arranged on the outer side of the support frame 9 away from the upper connecting plate 3, that is, on the outside of the support frame 9, the adjusting plate 4 is formed with an insertion protrusion 42, the support frame 9 and the corresponding upper connecting plate 3 are both formed with a mounting through hole 91, the insertion protrusion 42 is rotatably arranged in the mounting through hole 91, and the end of the insertion protrusion 42 can pass through the mounting through hole 91 and be inserted into the insertion slot 511, the adjusting plate 4 can drive the tooth plate 5 connected thereto to rotate, and then drive the remaining tooth plates 5 to rotate synchronously through the lower connecting plate 11, so as to adjust the angle of the tooth plate 5.

[0073] The locking assembly comprises a locking bolt and a locking nut 10; the adjusting plate 4 is formed with an arc-shaped through hole 41 which is arranged at the center of the mounting through hole 91; the corresponding upper connecting plate 3 is formed with a threaded hole, the locking bolt is arranged in the arc-shaped through hole 41 and the threaded hole, and is locked by the locking nut 10 abutting against the side of the adjusting plate 4 away from the upper connecting plate 3.

[0074] According to the above-described structure, the adjusting plate 4 is rotated, the adjusting plate 4 can drive the tooth plate 5 connected thereto to rotate, since all the tooth plates 5 are connected together through the lower connecting plate 11, when one of the tooth plates 5 rotates, the other tooth plates 5 are driven to rotate synchronously, and then the rotation angles of all the tooth plates 5 are adjusted synchronously, and after the angle of the tooth plate 5 is adjusted, the locking nut 10 can be used to fix the locking bolt, so as to fix the adjusting plate 4, and the tooth plate 5 can keep this state and prevent arbitrary rotation in the work.

[0075] Further, preferably, the adjusting plate 4 is in a fan-shaped structure to meet the rotation requirement, of course, not limited thereto.

[0076] It should be noted that in the embodiment, the screen box of the harvester further comprises a wave-shaped pressing plate and a plurality of finger-shaped screens 6, the plurality of finger-shaped screens 6 are connected to one side of the rear vibrating member 1 through the wave-shaped pressing plate, and the wave-shaped pressing plate and the rear vibrating member 1 are connected through welding, which belongs to the existing structure and will not be described in detail here.

[0077] Embodiment three

[0078] The third embodiment of the present application also provides a harvester comprising the screen box of the harvester according to the first or second embodiment, thus having all the beneficial technical effects of the screen box of the harvester, and the same technical features and beneficial effects will not be described again.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sieve box of a harvester, characterized in that The utility model relates to a box and the front vibration board, rear vibration piece and screening assembly of setting in the box are provided, wherein the front vibration board and the rear vibration piece are sequentially and spaced apart along the first preset direction; Along the second preset direction, the screening assembly is arranged below the front vibration board and the rear vibration piece, and is used for screening the material falling after being shaken by the front vibration board and the rear vibration piece; The rear vibration piece is formed with a plurality of pre-screening holes. A plurality of the pre-screening holes are arranged in an array along the first preset direction and the third preset direction.

2. A screen box for a harvester as claimed in claim 1, characterised in that, Along the first preset direction, any two adjacent columns of the pre-screening holes are staggered.

3. A screen box for a harvester as claimed in claim 2, characterised in that, Along the third preset direction, any two adjacent rows of the pre-screening holes are staggered. The rear vibration piece is a corrugated plate.

4. A screen box for a harvester as claimed in claim 3, characterised in that, Along the first preset direction, one of any two adjacent columns of the pre-screening holes is located at the valley position of the rear vibration piece, and the other is located at the peak of the rear vibration piece.

5. A screen box for a harvester as claimed in claim 4, characterised in that, The pre-screening hole is a waist-shaped hole with the same length direction as the first preset direction.

6. The screen box of a harvester according to claim 2, characterized in that, The rear vibration piece includes a support frame, an upper connecting plate, a lower connecting plate, a tooth plate assembly, an adjusting assembly, and a locking assembly; The support frame is fixedly connected to the inner wall of the box, and the tooth plate assembly, the upper connecting plate, and the lower connecting plate are arranged in the support frame; The tooth plate assembly includes a plurality of sequentially and spaced tooth plates; The number of the upper connecting plate is two, and is arranged on the opposite sides of the tooth plate assembly along the length direction of the tooth plate, and the two upper connecting plates are fixed on the support frame; The opposite sides of the tooth plate are formed with upper rotary connecting parts, and the upper connecting plates on both sides are formed with upper auxiliary mounting through holes, the upper rotary connecting parts are rotatably inserted into the corresponding upper auxiliary mounting through holes, and one of the upper rotary connecting parts is formed with a plug-in slot; The number of the lower connecting plate is two, and is arranged on the opposite sides of the tooth plate assembly along the length direction of the tooth plate, and any tooth plate is rotatably connected with the lower connecting plates on both sides; 7. The harvester's screen box according to claim 1, characterized in that, The adjusting assembly is mounted on the support frame and connected with one of the upper rotary connecting parts, for synchronously adjusting the rotation angle of all the tooth plates; The locking assembly is used for locking the adjusting assembly to lock the posture of all the tooth plates. The adjusting assembly includes an adjusting plate arranged on the outer side of the support frame away from the upper connecting plate, the adjusting plate is formed with a plug-in protruding part, the support frame and the corresponding upper connecting plate are formed with mounting through holes, the plug-in protruding part is rotatably inserted into the mounting through hole, and the end of the plug-in protruding part can pass through the mounting through hole and be plugged together with the plug-in slot, the adjusting plate can drive the tooth plate connected therewith to rotate, and then drive the remaining tooth plates to rotate synchronously through the lower connecting plate, so as to adjust the angle of the tooth plate.

8. A screen box for a harvester as claimed in claim 7, characterised in that, ​ 9. A screen box for a harvester as claimed in claim 8, characterised in that, The locking assembly comprises a locking bolt and a locking nut; wherein the adjusting plate is formed with an arc-shaped through hole, and the arc-shaped through hole is arranged with the mounting through hole as the center; correspondingly, the upper connecting plate is formed with a threaded hole, the locking bolt is installed in the arc-shaped through hole and the threaded hole, and is locked by the locking nut abutting against the side of the adjusting plate away from the upper connecting plate.

10. A harvester characterized by A screen box comprising the harvester of any one of claims 1 to 9.

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