Fish scale screen, cleaning system and harvester for grain cleaning

Abstract

The invention belongs to the field of grain cleaning for harvesters, and discloses a fish scale screen for grain cleaning, a cleaning system and a harvester, comprising a screen body frame, a fish scale screen assembly, a screen spacing adjustment device, an opening adjustment device, and a screen area adjustment device; the fish scale screen assembly at least comprises an upper screen and a lower screen, the upper screen is mounted on a hollow shaft, and the lower screen is mounted on a solid shaft; a long strip slide groove is provided on the side wall of the hollow shaft along its axis, and the solid shaft is sleeved in the hollow shaft; and a connecting plate is further extended from the hollow shaft, and a connecting shaft is arranged at the bottom of the connecting plate; the screen spacing adjustment device is arranged on the outer side of the first side plate to change the distance between each fish scale screen assembly; the opening adjustment device is arranged below the first side plate and the second side plate to change the opening of the upper screen and the lower screen on each fish scale screen assembly; the screen area adjustment device is arranged on the outer side of the second side plate to change the axial distance between the upper screen and the lower screen.

Description

Technical Field

[0001] The invention relates to the field of grain cleaning of harvesters, and in particular to a fish scale screen for grain cleaning, a cleaning system and a harvester. Background Art

[0002] The main function of the harvester cleaning system is to separate and remove impurities from the combine harvester to ensure the cleanliness of the harvest. The fish scale screen is the main component of the harvester cleaning system. Its main function is to effectively separate crops from weeds, straw, stones and other impurities through vibration and under the action of the fan to improve the crop cleaning effect.

[0003] At present, the general fish scale screen separates the crops from the impurities through the blowing of the fan and its own vibration, ensuring that only the crops are retained after cleaning, and the impurities are removed through another channel. However, at this stage, most fish scale screens on the market can only adjust the opening, which has a very limited effect on the improvement of the cleaning effect. It is difficult to make automatic adjustments when the feed amount or impurity content is different, which greatly affects the cleanliness of the harvest. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a fish scale screen with adjustable screen spacing, opening and screen area for use in grain cleaning, which can realize real-time adjustment of the screen spacing, opening and screen area and can effectively deal with different feed amounts and different impurity contents.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a fish scale screen for grain cleaning, comprising a screen body frame, a fish scale screen assembly, a screen spacing adjustment device, an opening adjustment device, and a screen area adjustment device;

[0007] Wherein, the screen frame comprises a first side plate and a second side plate, and slide grooves are provided on the first side plate and the second side plate;

[0008] The fish scale screen assembly at least comprises an upper screen and a lower screen, wherein the upper screen is mounted on a hollow shaft, and the lower screen is mounted on a solid shaft; a long strip-shaped slide groove is provided on the side wall of the hollow shaft along its axis, and the solid shaft is sleeved in the hollow shaft; and a connecting plate is extended from the hollow shaft, and a connecting shaft is arranged at the bottom of the connecting plate; both ends of the hollow shaft extend into the two slide grooves;

[0009] The screen spacing adjustment device is arranged on the outer side of the first side plate, connected to the hollow shaft, and drives the hollow shaft to slide along the slide groove to change the distance between each fish scale screen assembly;

[0010] The opening adjustment device is arranged below the first side plate and the second side plate, driving the connecting shaft to move downward to change the opening of the upper screen and the lower screen on each fish scale screen assembly;

[0011] The screen area adjustment device is arranged on the outer side of the second side plate and is connected to the solid shaft, driving the solid shaft to move toward the outer side of the screen body frame to change the axial distance between the upper screen and the lower screen.

[0012] As a further technical solution, the screen spacing adjustment device includes a servo motor, a pull rod and multiple connecting rods. The servo motor drives the pull rod to rotate, and the pull rod is hinged to one end of multiple connecting rods in turn; the multiple connecting rods are arranged parallel to each other, and the other end of each connecting rod is rotatably connected to the hollow shaft of a fish scale screen assembly.

[0013] As a further technical solution, the pull rod and the connecting rod are located on the first side plate and the outer side, and the servo motor is arranged on the inner side of the first side plate.

[0014] As a further technical solution, the opening adjustment device includes an opening adjustment frame and a first push rod; the first push rod is installed on the side of the screen frame to drive the opening adjustment frame to move upward or downward relative to the screen frame, and a first connecting groove is provided on the opening adjustment frame, and one end of the connecting shaft is fixed in the first connecting groove.

[0015] As a further technical solution, the screen area adjustment device includes an area adjustment frame and a second push rod. The area adjustment frame is provided with a second connecting groove, which is used to connect the solid shaft in the fish scale screen assembly.

[0016] As a further technical solution, the area adjustment frame is located on the outer side of the second side plate, and the second push rod is arranged on the inner side of the second side plate.

[0017] As a further technical solution, the screen area adjustment device also includes an upper screen extension plate, a lower screen extension plate and a sliding plate; the upper surface of the upper screen plate is connected to the upper screen extension plate through a first sliding plate; the lower surface of the lower screen plate is connected to the lower screen extension plate through a second sliding plate.

[0018] As a further technical solution, the first sliding plate is rotatably connected to the upper screen plate, and the second sliding plate is rotatably connected to the lower screen plate.

[0019] In a second aspect, the present invention also provides a cleaning system, comprising the fish scale screen for grain cleaning as described above.

[0020] In a third aspect, the present invention also provides a harvester, comprising the cleaning system.

[0021] Beneficial effects of the present invention:

[0022] The fish scale screen with adjustable screen spacing, opening and screen area for grain cleaning proposed by the present invention can realize the real-time adjustment of the screen spacing, opening and screen area of ​​the fish scale screen at the same time by designing the specific structures of the fish scale screen assembly, screen spacing adjustment device, opening adjustment device and screen area adjustment device so that the specific structures of the fish scale screen assembly, screen spacing adjustment device, opening adjustment device and screen area adjustment device cooperate with each other.

[0023] It can effectively screen different feed amounts and different impurity contents, thereby improving the cleanliness of the harvest. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of part A;

[0027] Figure 3 for Figure 1 A magnified view of part B;

[0028] Figure 4 It is a detailed structural schematic diagram of the screen plate part in the present invention;

[0029] Figure 5 The working state of the screen spacing adjustment device in the present invention is shown in FIG. Figure 1 ;

[0030] Figure 6 The working state of the screen spacing adjustment device in the present invention is shown in FIG. Figure 2 ;

[0031] Figure 7 It is a schematic diagram of the opening adjustment device of the present invention;

[0032] Figure 8 It is a schematic diagram of the screen area adjustment device of the present invention.

[0033] Fig. 9 It is a schematic diagram of the screen plate extension device of the present invention;

[0034] Fig.10 It is a schematic diagram of the screen body frame of the present invention;

[0035] Fig.11 is a schematic diagram of the opening adjustment frame of the present invention;

[0036] Fig.12 is a schematic diagram of an area adjustment frame of the present invention;

[0037] Fig.13 is a schematic diagram of the slide;

[0038] In the figure: 1. screen frame; 101. slide; 2. upper screen extension; 3. upper screen; 31. hollow shaft; 32. connecting plate; 33. connecting shaft; 4. lower screen; 41. solid shaft; 5. lower screen extension; 6. screen spacing adjustment device; 61. pull rod, 62. connecting rod; 7. opening adjustment frame; 71. first connecting slot; 8. first push rod; 9. servo motor; 10. slide; 11. area adjustment frame; 111. second connecting slot; 12. second push rod; DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0041] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] Glossary: ​​The screen spacing adjustment in this embodiment mainly refers to the distance adjustment between adjacent fish scale screen assemblies; the opening adjustment mainly refers to the adjustment of the angle of the upper screen and the lower screen in each fish scale screen assembly, and the inclination angle of the screen relative to the screen body frame 1; the area adjustment mainly includes two aspects, one refers to the adjustment of the repeatability of the upper screen and the lower screen in each fish scale screen assembly; the other refers to the area adjustment of the upper screen and the lower screen.

[0043] The present invention is described in detail below in conjunction with the accompanying drawings:

[0044] The embodiment of the present invention provides a fish scale screen with adjustable screen spacing, opening and screen area for grain cleaning, comprising a screen frame 1, a fish scale screen assembly, a screen spacing adjustment device 6, an opening adjustment device, and a screen area adjustment device;

[0045] Among them, the screen frame 1 provides a certain support for the installation of other devices;

[0046] The fish scale screen assembly is mainly composed of four fish scale screens, and can be coordinated with various devices to achieve a variety of changes, including screen spacing adjustment, opening adjustment and area adjustment of the fish scale screen assembly.

[0047] The screen spacing adjustment device 6, under the action of the servo motor 9, can make the fish scale screen assembly move along the slide groove 101 of the screen body frame 1 through the combination of multiple crank slider mechanisms, so as to adjust the spacing between each fish scale screen assembly.

[0048] The opening adjustment device pushes the first push rod 8 to adjust the vertical distance between the opening adjustment frame 7 and the screen frame 1, so that the fish scale screen assembly rotates around its center line at a certain angle, thereby achieving the function of adjusting the opening of the screen.

[0049] The area adjustment device pushes the adjustment frame through the second push rod 12, so that the upper screen 3 and the lower screen 4 in each fish scale screen assembly are axially moved, thereby adjusting the overlapping area of ​​the upper screen 3 and the lower screen 4; at the same time, by adjusting the position of the upper screen extension piece 2 on the upper screen 3 and the position of the lower screen extension piece 5 on the lower screen 4, the area adjustment of the screen itself is achieved.

[0050] Furthermore, the above-mentioned screen body frame 1 includes a left side plate and a right side plate, the left side plate and the right side plate are connected by a connecting plate 32, and a slide groove 101 is arranged on both the right side plate and the left side plate; the slide groove 101 is arranged along the length direction of the left side plate and the right side plate; the function of the slide groove 101 is to install the two ends of the hollow shaft 31 of the upper screen plate 3 described below, and the hollow shaft 31 can be moved back and forth along the slide groove 101 to the desired position when the screen spacing adjustment device 6 is adjusted.

[0051] Specifically, along the length direction of the left and right plates of the screen frame 1, multiple groups of fish scale screens are arranged on one side, and the multiple groups of fish scale screens can perform corresponding movements simultaneously under the action of the screen spacing adjustment device 6, the opening adjustment device, the screen area adjustment device, etc.

[0052] Furthermore, each group of fish scale screens comprises an upper screen plate 3, a lower screen plate 4, an upper screen plate extension plate 2 and a lower screen plate extension plate 5; an upper screen plate extension plate 2 is arranged on the upper surface of the upper screen plate 3, and the upper screen plate extension plate 2 can move up and down along the upper surface of the upper screen plate 3, thereby changing the height of the screen plate; a lower screen plate extension plate 5 is arranged on the lower surface of the lower screen plate 4, and the lower screen plate extension plate 5 can move up and down along the lower surface of the lower screen plate 4, thereby changing the height of the screen plate; and the lower screen plate 4 can move left and right relative to the upper screen plate 3, that is, to control the axial distance between the upper screen plate 3 and the lower screen plate 4, thereby controlling the area of ​​the fish scale screen.

[0053] Specifically, the axial distance between the upper screen plate 3 and the lower screen plate 4 is achieved by:

[0054] The upper screen 3 and the lower screen 4 are connected together through the shaft hole. The upper screen 3 is installed on a hollow shaft 31, and the lower screen 4 is installed on a solid shaft 41. A long groove is provided on the side wall of the hollow shaft 31 along its axis. The solid shaft 41 is sleeved in the hollow shaft 31. One end of the solid shaft 41 is connected to the area adjustment frame 11. By driving the area adjustment frame 11, the axial movement of the lower screen 4 relative to the lower screen 4 can be achieved, thereby achieving the adjustment of the screen area.

[0055] Furthermore, the above-mentioned screen spacing adjustment device 6 includes a pull rod 61, which is hinged to one end of a plurality of connecting rods 62 in turn, and the plurality of connecting rods 62 are arranged in parallel with each other, and the other end of each connecting rod 62 is rotatably connected to a hollow shaft 31 of an upper screen plate 3; the pull rod 61 is connected to a servo motor 9, and the servo motor 9 controls the pull rod 61 to rotate on the vertical plane outside the frame side plate. Under the action of the servo motor 9, the pull rod 61 of the screen spacing adjustment device 6 is rotated, and the pull rod 61 can make the combination of the plurality of connecting rods 62 Each fish scale screen assembly moves along the slide groove 101 of the screen body frame 1, so as to adjust the spacing between each fish scale screen assembly. In essence, the spacing is adjusted by adjusting the distance between each hollow shaft 31. Because the fish scale screen assembly is a whole, the spacing between each fish scale screen assembly can be adjusted by adjusting the hollow shaft 31 in the fish scale screen assembly, so as to enlarge or reduce the spacing between each fish scale screen assembly. The adjustment principle of the screen spacing adjustment device 6 in this embodiment adopts the principle of the existing crank slider structure.

[0056] Furthermore, the opening adjustment device of each fish scale screen assembly includes an opening adjustment frame 7 and a first push rod 8; the first push rod 8 is installed on the side of the screen frame 1, driving the opening adjustment frame 7 to move upward or downward relative to the screen frame 1; an opening adjustment frame 7 can be set under the left and right plates of the screen frame 1; the two opening adjustment frames 7 are connected together and driven together by two symmetrically arranged first push rods 8, or only one opening adjustment frame 7 is set under the left or right plate of the screen frame 1; it is driven by an opening adjustment frame 7 and a first push rod 8; preferably, for the sake of overall balance, two opening adjustment frames 7 are symmetrically arranged. Furthermore, the structure of each opening adjustment frame 7 is as follows Fig.11 As shown, a first connecting groove 71 is provided on the opening adjustment frame 7, and a connecting plate 32 is extended from the hollow shaft 31 in the above-mentioned fish scale screen assembly. A connecting shaft 33 is provided at the bottom of the connecting plate 32, and one end of the connecting shaft 33 is fixed on the first connecting groove 71 of the opening adjustment frame.

[0057] Furthermore, the area adjustment in this embodiment is implemented as follows:

[0058] First: The device for adjusting the overlapping area of ​​the upper screen 3 and the lower screen 4 mainly includes an area adjustment frame 11 and a second push rod 12. The area adjustment frame 11 is as shown in FIG. Fig.12 As shown, the area adjustment frame 11 is provided with a second connecting groove 111, which is used to connect the solid shaft 41 in the fish scale screen assembly. The area adjustment frame 11 is arranged on the outer side of the left side plate of the screen body frame 1. Under the action of the second push rod 12, it can move a certain distance to the left. When the second push rod 12 moves to the left, it pulls the solid shaft 41 and the lower screen 4 to the left for a certain distance, so that the lower screen 4 and the upper screen 3 are misaligned in the axial direction to adjust the working area of ​​the upper screen 3 and the lower screen 4; when the upper screen 3 and the lower screen 4 are completely aligned up and down, the working area is the smallest; when the upper screen 3 and the lower screen 4 are completely staggered laterally, the working area is the largest; when the upper screen 3 and the lower screen 4 do not overlap, the working area is between the maximum value and the minimum value; the screen area adjustment device pushes the area adjustment frame 11 in the screen area adjustment device through the second push rod 12 to control the distance between the area adjustment frame 11 and the screen body frame 1. In this embodiment, the solid shaft 41 of the lower screen 4 is matched with the second connecting groove 111 of the area adjustment frame 11, and one end is placed outside the second connecting groove 111 with a bolt, so as to control the axial distance between the upper screen 3 and the lower screen 4, thereby controlling the area of ​​the fish scale screen. It should be noted that the moving distance of the lower screen 4 in this embodiment is relatively small, and a certain misalignment between the upper screen 3 and the lower screen 4 is sufficient, so the lower screen 4 cannot pass through the left side plate, and it moves inside the left side plate.

[0059] Second: the device for adjusting the overlapping area of ​​the upper screen 3 and the lower screen 4 mainly includes: an upper screen extension piece 2, a lower screen extension piece 5 and a slide 10; the upper screen extension piece 2 realizes the area adjustment of the upper screen 3; the lower screen extension piece 5 realizes the area adjustment of the lower screen 4, and the adjustment between the upper screen 3 and the upper screen extension piece 2, and the lower screen 4 and the lower screen extension piece 5 is realized by the following method:

[0060] The upper screen 3 and the upper screen extension piece 2 are connected together by a slide 10. After opening the slide 10, the upper screen extension piece 2 can be manually stretched outward, and then the slide 10 is reset to complete the locking of the upper screen extension piece 2, thereby completing the extension of the fish scale screen; specifically, the slide 10 is connected to the upper screen 3 by a pin shaft, and can rotate around the pin shaft, such as Fig. 9 As shown, when the slide 10 rotates to the left and completely leaves the matching position of the upper screen 3 and the upper screen extension piece 2, the upper screen extension piece 2 can be moved upward; when the slide 10 rotates to the right and presses the matching position of the upper screen 3 and the upper screen extension piece 2, the upper screen extension piece 2 cannot move.

[0061] Similarly, the lower screen 4 and the lower screen extension piece 5 are also connected together by another slide 10. After opening the slide 10, the lower screen extension piece 5 can be manually stretched outward, and then the slide 10 is reset to complete the locking of the lower screen extension piece 5, thereby completing the extension of the fish scale screen; specifically, the slide 10 is connected to the lower screen 4 by a pin shaft and can rotate around the pin shaft, such as Fig. 9 As shown, when the slide 10 rotates to the left and completely leaves the matching position of the lower screen plate 4 and the lower screen plate extension plate 5, the lower screen plate extension plate 5 can be moved upward; when the slide 10 rotates to the right and presses the matching position of the lower screen plate 4 and the lower screen plate extension plate 5, the lower screen plate extension plate 5 cannot be moved.

[0062] As a further technical solution, the fish scale screen with adjustable screen spacing, opening and screen area, drives the pull rod 61 in the screen spacing adjustment device 6 by a servo motor, so that the pull rod 61 rotates to adjust the screen spacing; the opening adjustment frame 7 of the opening adjustment device is vertically pushed by the first push rod to control the vertical distance between the opening adjustment frame 7 and the screen body frame 1 to adjust the opening; the area adjustment frame 11 of the area adjustment device is horizontally pushed by the second push rod 12 to control the horizontal distance between the area adjustment frame 11 and the screen body frame 1 to adjust the overlapping area of ​​the upper screen 3 and the lower screen 4, and the area of ​​a single upper screen 3 and a lower screen 4 is adjusted by setting an upper screen extension piece 2 and a lower screen extension piece 5.

[0063] The specific application methods are as follows:

[0064] When the feed amount is large, the opening and screen spacing of the fish scale screen can be appropriately increased.

[0065] When the feed volume is small, the opening and screen spacing of the fish scale screen can be reduced, while the screen area can be increased to prevent crops from being misscreened.

[0066] When the moisture content is low, the opening and screen spacing of the fish scale screen can be reduced, while the screen area can be increased.

[0067] When the moisture content is high, the opening and screen spacing of the fish scale screen can be appropriately increased.

[0068] It is recommended to adjust the sieve according to the actual situation of the operation. First, increase the opening of the sieve until more impurities appear in the grain box; then, slightly reduce the opening of the sieve until the cleanliness of the sample in the grain box reaches an acceptable level.

[0069] Furthermore, this embodiment also provides a cleaning system, which includes the fish scale screen with adjustable screen spacing, opening, and screen area as described above. Since the cleaning system is provided with the fish scale screen with adjustable screen spacing, opening, and screen area as described above, the cleaning system also has all the advantages as described above.

[0070] Furthermore, the present embodiment also provides a harvester, which includes the fish scale screen with adjustable screen spacing, opening, and screen area as described above, and a cleaning system. Since the harvester is provided with the fish scale screen with adjustable screen spacing, opening, and screen area as described above, the harvester also has all the advantages as described above.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fish scale screen for grain cleaning, characterized in that: It includes a screen body frame, a fish scale screen assembly, a screen spacing adjustment device, an opening adjustment device, and a screen area adjustment device; Wherein, the screen frame comprises a first side plate and a second side plate, and slide grooves are provided on the first side plate and the second side plate; The fish scale screen assembly comprises at least an upper screen and a lower screen, wherein the upper screen is mounted on a hollow shaft, and the lower screen is mounted on a solid shaft; a long strip-shaped slide groove is provided on the side wall of the hollow shaft along its axis, and the solid shaft is sleeved in the hollow shaft; and a connecting plate is extended from the hollow shaft, and a connecting shaft is arranged at the bottom of the connecting plate; both ends of the hollow shaft extend into the two slide grooves; The screen spacing adjustment device is arranged on the outer side of the first side plate, connected to the hollow shaft, and drives the hollow shaft to slide along the slide groove to change the distance between each fish scale screen assembly; The opening adjustment device is arranged below the first side plate and the second side plate, driving the connecting shaft to move downward to change the opening of the upper screen and the lower screen on each fish scale screen assembly; The screen area adjustment device is arranged on the outside of the second side plate and connected to the solid shaft, driving the solid shaft to move toward the outside of the screen body frame to change the axial distance between the upper screen and the lower screen; The upper screen and the lower screen are connected together through the shaft hole. The upper screen is installed on a hollow shaft, and the lower screen is installed on a solid shaft. A long strip of sliding groove is provided on the side wall of the hollow shaft along its axis. The solid shaft of the lower screen is sleeved in the hollow shaft of the upper screen, and one end of the solid shaft of the lower screen is connected to the area adjustment frame. The screen area adjustment device comprises an area adjustment frame and a second push rod, the area adjustment frame is provided with a second connecting groove, the second connecting groove is used to connect the solid shaft in the fish scale screen assembly, the area adjustment frame is located on the outer side of the second side plate, and the second push rod is arranged on the inner side of the second side plate; The screen area adjustment device further comprises an upper screen extension piece, a lower screen extension piece and a slide; the upper surface of the upper screen is connected to the upper screen extension piece through a first slide; the lower surface of the lower screen is connected to the lower screen extension piece through a second slide; the first slide is rotatably connected to the upper screen, and the second slide is rotatably connected to the lower screen; By designing the specific structures of the fish scale screen assembly, the screen spacing adjustment device, the opening adjustment device and the screen area adjustment device, the specific structures of the fish scale screen assembly, the screen spacing adjustment device, the opening adjustment device and the screen area adjustment device cooperate with each other, and the screen spacing, opening and screen area of ​​the fish scale screen can be adjusted in real time at the same time, and different feed amounts and different impurity contents can be effectively screened, thereby improving the cleanliness of the harvest.

2. The fish scale screen for grain cleaning according to claim 1, characterized in that: The screen spacing adjustment device includes a servo motor, a pull rod and multiple connecting rods. The servo motor drives the pull rod to rotate, and the pull rod is hinged to one end of multiple connecting rods in turn; multiple connecting rods are arranged parallel to each other, and the other end of each connecting rod is rotatably connected to the hollow shaft of a fish scale screen assembly.

3. The fish scale screen for grain cleaning according to claim 2, characterized in that: The pull rod and the connecting rod are located on the first side plate and the outer side, and the servo motor is arranged on the inner side of the first side plate.

4. The fish scale screen for grain cleaning according to claim 1, characterized in that: The opening adjustment device comprises an opening adjustment frame and a first push rod; the first push rod is installed on the side of the screen body frame, and drives the opening adjustment frame to move upward or downward relative to the screen body frame.

5. The fish scale screen for grain cleaning according to claim 4, characterized in that: A first connecting groove is arranged on the opening adjustment frame, and one end of the connecting shaft is fixed in the first connecting groove.

6. A cleaning system, comprising the fish scale screen for grain cleaning according to any one of claims 1 to 5.

7. A harvester, characterized in that: Includes the cleaning system as described in claim 6.

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