A live fish post-treatment screening and grading apparatus

Abstract

This application relates to the field of fish processing and screening equipment, specifically a live fish processing and grading device. The device includes an adjacent conveyor platform and a weighing platform. The conveyor platform consists of a support frame and a conveyor belt. A first drive motor is mounted on the support frame to drive the conveyor belt. Several equidistantly arranged receiving frame assemblies and screening mechanisms are located on both sides of the conveyor belt, with each receiving frame assembly and screening mechanism corresponding to the other. The screening mechanism pushes the weighed fish from the conveyor belt into the corresponding receiving frame assembly based on the weight measured by the weighing platform. A fish frame is located below each receiving frame assembly. After the fish is weighed, a pusher plate corresponding to the fish weight rotates under the drive of a first servo motor, causing the weighed fish to be intercepted by the pusher plate and transported to the corresponding receiving frame assembly. This achieves the effect of grading and screening the fish based on weight, facilitating subsequent grading, processing, and sales without the need for manual screening, thus improving the efficiency of fish grading and screening.

Description

Technical Field

[0001] This application relates to the field of fish processing and screening equipment, and more particularly to a live fish processing and screening grading device. Background Technology

[0002] Fish is rich in nutrients such as protein, unsaturated fatty acids, vitamins, and minerals, which are beneficial to human health. Its tender texture and delicious taste make it a popular food. As a nutritious, easily digestible, and palatable food, fish has seen a continuous increase in market demand, leading to a gradual expansion of fish farming. After being caught, fish are typically sorted and graded for further processing or sale. However, current fish sorting and grading based on weight is usually done manually, with the weighed fish placed into corresponding weight baskets, resulting in low processing efficiency.

[0003] Chinese invention patent CN115805192A discloses a fish grading and screening device, including a base. One side of the base has a loading area for placing thawed fish, and the interior of the base has a unloading area for sorting fish of different sizes. One side of the loading area has multiple fish passages, each including two inclined plates that move closer together. One end of each fish passage has multiple conveyor belts, and the interior of each conveyor belt has a flipping component to turn over the fish piled on its surface. In this fish grading and screening device, the flipping component and the sorting component work together to turn over the fish at the bottom of the conveyor belt, effectively breaking up the stacked fish. This allows some of the smaller fish piled above the larger fish to fall onto the surface of the conveyor belt and smoothly fall through the gaps between the conveyor belts into the corresponding unloading area, allowing fish of different sizes to enter the corresponding unloading area and improving the overall screening quality.

[0004] However, current sorting and grading equipment ignores the body shape of fish when sorting by size, such as laterally compressed bream and long, thin knife fish. When sorting and grading mixed fish of these types, it is difficult to correctly sort and grade fish of the corresponding weight, which will affect the subsequent processing or sales of the fish. Summary of the Invention

[0005] This application proposes a live fish processing and grading device, which has the advantage of facilitating fish screening and grading, and solves the problem of poor accuracy in existing equipment that screens and grades fish based on size.

[0006] To achieve the above objectives, this application adopts the following technical solution: a live fish processing and grading device, comprising an adjacent conveying platform and a weighing platform. The conveying platform consists of a support frame and a conveyor belt. The support frame is equipped with a first drive motor that drives the conveyor belt. Several equidistantly arranged receiving frame assemblies and screening mechanisms are provided on both sides of the conveyor belt. The receiving frame assemblies and screening mechanisms correspond one-to-one. The screening mechanism pushes the weighed fish on the conveyor belt into the receiving frame assembly of the corresponding weight according to the weighing of the fish by the weighing platform. A fish frame is provided below the receiving frame assembly.

[0007] Furthermore, positioning beams located on both sides of the conveyor belt are fixedly installed on the support frame, and the receiving frame assembly and the screening mechanism are respectively located on one side of the two positioning beams.

[0008] Furthermore, the receiving frame assembly includes an inner baffle, with side baffles fixedly connected to both ends of one side of the inner baffle, and an outer baffle fixedly connected to the side of the two side baffles away from the inner baffle.

[0009] Furthermore, both sides of the inner baffle are inclined surfaces, and the length of the top of the inner baffle is greater than the length of the bottom of the inner baffle.

[0010] Furthermore, the screening mechanism includes a positioning horizontal plate, one end of which is rotatably fitted with a rotating shaft, the top end of which is fixedly connected to a push plate, and the top end of the rotating shaft is fixedly connected to one end of the push plate. A mounting plate located directly below the positioning horizontal plate is fixedly installed on the support frame, and a first servo motor that drives the rotating shaft to rotate is fixedly installed at the bottom of the mounting plate.

[0011] Furthermore, the receiving frame assembly includes an inner baffle. Side baffles are fixedly connected to both ends of the inner baffle on the side away from the positioning beam. Outer baffles are fixedly connected to the sides of the two side baffles on the side away from the inner baffle. A central rotating shaft is movably fitted onto the bottom of the inner baffle. A second servo motor is fixedly installed on the outer side of the outer baffle. The piston shaft of the second servo motor is fixedly connected to the end of the central rotating shaft away from the inner baffle. The central rotating shaft is movably sleeved with the outer baffle. A movable support plate is fixedly fitted onto the outside of the central rotating shaft. The two ends of the movable support plate are close to but not in contact with the two side baffles. The two sides of the movable support plate are movably connected to the sides of the inner and outer baffles, respectively. Each receiving frame assembly is located directly above two adjacent fish frames.

[0012] Furthermore, two limiting shafts are fixedly connected between the inner baffle and the outer baffle. The two limiting shafts are located at opposite ends of the top of the inner baffle. Movable baffles are movably fitted onto the two limiting shafts. The end of the movable baffle near the limiting shaft is movably connected to the inner wall of the side baffle, and the end of the movable baffle away from the limiting shaft is movably connected to one end of the movable support plate. A limiting baffle near the limiting shaft is fixedly installed on the inner wall of the side baffle.

[0013] Furthermore, the screening mechanism includes a hydraulic cylinder fixedly mounted on a bracket, the hydraulic cylinder being located directly below the conveyor belt. A push shaft is fixedly connected to one end of the piston shaft of the hydraulic cylinder, and a fourth connecting plate is fixedly connected to the end of the push shaft away from the piston shaft. Third connecting plates are fixedly connected to both ends of the top of the fourth connecting plate, and second connecting plates are fixedly connected to the tops of the two third connecting plates. First connecting plates are fixedly connected to both ends of the second connecting plates facing the receiving frame assembly. Positioning horizontal plates are fixedly connected to the ends of the two first connecting plates away from the second connecting plates. Limiting horizontal plates are fixedly connected to both ends of the positioning horizontal plates facing the receiving frame assembly. Linkage shafts are rotatably mounted on the ends of the two limiting horizontal plates away from the positioning horizontal plates. Linkage rotating plates are fixedly mounted on the two linkage rotating shafts. The ends of the two linkage rotating plates away from the linkage rotating shafts are fixedly connected to both ends of the top of the push plate. A motor bracket located on the side of the limiting horizontal plate is fixedly mounted on one end of the positioning horizontal plate. A third servo motor is fixedly mounted on the motor bracket, and the output shaft of the third servo motor is fixedly connected to one end of the linkage rotating shaft.

[0014] Furthermore, the side of the fourth connecting plate is fixedly connected with limiting slide shafts located on both sides of the push shaft, and one end of the limiting slide shaft is movably sleeved with a crossbeam on the support frame.

[0015] The beneficial effects of this invention are:

[0016] 1. The present application provides a live fish processing and grading device, which continuously transports weighed fish via a conveyor belt, and sets up several screening mechanisms on one side of the conveyor belt, each driven by a first servo motor to rotate a push plate, and a receiving frame assembly on the other side of the conveyor belt to receive the fish. After the fish are weighed, the push plate corresponding to the fish weight rotates under the drive of the first servo motor, so that the weighed fish are intercepted by the push plate and transported to the corresponding receiving frame assembly, thereby achieving the effect of screening and grading the fish according to the weight, so as to facilitate subsequent grading, processing and sales without manual screening, thus improving the efficiency of fish screening and grading.

[0017] 2. A rotatable movable tray is installed on the inner side of the receiving frame assembly, and each receiving frame assembly is located directly above two adjacent fish frames. With the structural design of the push plate rotating and separating from the conveyor belt to create space, the push plate pushes the weighed fish to the corresponding receiving frame assembly. During the reset movement away from the receiving frame assembly, the push plate can avoid affecting the conveyor belt's fish transport, improving the efficiency of fish transport, screening, and grading. At the same time, it can also control adjacent fish of the same weight on the conveyor belt to fall into the same fish frame after passing two adjacent receiving frame assemblies, realizing fish screening and grading. Without changing the operating speed of the push plate of the screening mechanism, the spacing between fish on the conveyor belt can be controlled to be smaller, and subsequent fish are not affected by the push plate moving away from the receiving frame assembly, further improving the efficiency of fish screening and grading. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0021] Figure 2 for Figure 1 A structural diagram of a material receiving frame component;

[0022] Figure 3 for Figure 1 The rear view in the middle;

[0023] Figure 4 for Figure 3 A schematic diagram of the structure of a screening mechanism;

[0024] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0025] Figure 6 for Figure 5 A structural diagram of a material receiving frame component;

[0026] Figure 7 for Figure 6 A schematic diagram of the middle receiving frame assembly without the outer baffle;

[0027] Figure 8 for Figure 6 Rear view;

[0028] Figure 9 for Figure 8 A magnified schematic diagram of the structure at point A;

[0029] Figure 10 for Figure 7 A magnified schematic diagram of the structure at point B.

[0030] In the diagram: 1. Conveyor belt; 2. First drive motor; 3. Weighing platform; 4. Fish frame; 5. Positioning beam; 6. Inner baffle; 7. Side baffle; 8. Outer baffle; 9. Positioning plate; 10. Rotating shaft; 11. Push plate; 12. First servo motor; 13. Intermediate rotating shaft; 14. Movable tray; 15. Movable baffle; 16. Second servo motor; 17. Linkage rotating plate; 18. Linkage rotating shaft; 19. Limiting plate; 20. Positioning plate; 21. Motor bracket; 22. Third servo motor; 23. Limiting baffle; 24. First connecting plate; 25. Second connecting plate; 26. Third connecting plate; 27. Fourth connecting plate; 28. Hydraulic cylinder; 29. ​​Push shaft; 30. Limiting sliding shaft; 31. Limiting rotating shaft. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] Example 1

[0033] Please see Figure 1 A live fish processing and grading device includes a conveyor platform and a weighing platform. The conveyor platform consists of a support frame and a conveyor belt 1. A first drive motor 2 is mounted on the support frame to drive the conveyor belt 1. The weighing platform is located on one side of the conveyor platform, close to but not in contact with it. Fish are weighed on the weighing platform 3 and then transported onto the conveyor belt 1. Please refer to [link to relevant documentation]. Figures 1-2 The support frame is fixedly installed with positioning beams 5 on both sides of the conveyor belt 1. Several equidistantly arranged receiving frame assemblies and screening mechanisms are fixedly installed on the outer side of the two positioning beams 5. The number of receiving frame assemblies and screening mechanisms are the same and correspond one-to-one. The screening mechanism pushes the weighed fish on the conveyor belt 1 into the receiving frame assembly of the corresponding weight according to the weighing platform. The linkage between the screening mechanism and the weighing mechanism can be programmed and controlled by setting the weighing sensor linkage controller in the prior art.

[0034] There are at least two receiving frame assemblies. Each receiving frame assembly has a fish basket 4 directly below it. The receiving frame assembly includes an inner baffle 6 fixedly installed on the side of a positioning beam 5. Side baffles 7 are fixedly connected to both ends of the inner baffle 6 away from the positioning beam 5. Outer baffles 8 are fixedly connected to the side of the two side baffles 7 away from the inner baffle 6. Both sides of the inner baffle 6 are inclined, and the length of the top of the inner baffle 6 is greater than the length of the bottom of the inner baffle 6, so that the two side baffles 7 are inclined so that the fish falling into the receiving frame assembly from the conveyor belt 1 can slide smoothly into the fish basket 4. The top of the two side baffles 7 extends beyond the conveyor belt 1 to ensure that the fish are not pushed outside the receiving frame assembly.

[0035] Please see Figures 3-4 The screening mechanism includes a positioning plate 9 fixedly installed on the side of another positioning beam 5. A rotating shaft 10 is rotatably mounted on one end of the positioning plate 9. A push plate 11 is fixedly connected to the top end of the rotating shaft 10, and the top end of the rotating shaft 10 is fixedly connected to one end of the push plate 11. A mounting support plate located directly below the positioning plate 9 is fixedly installed on the support frame. A first servo motor 12 is fixedly installed at the bottom of the mounting support plate. The output shaft of the first servo motor 12 is fixedly connected to the bottom end of the rotating shaft 10. The first servo motor 12 drives the rotating shaft 10 to drive the push plate 11 to rotate.

[0036] Please see Figures 1-4 In use, the fish are first weighed by the weighing platform 3. Then, according to the weight of the fish, the push plate 11 on the opposite side of the receiving frame component corresponding to the weight rotates. With the obstruction of the push plate 11 and the conveyor belt 1, the previously weighed fish falls into the fish frame 4 directly below the receiving frame component corresponding to the fish weight. This achieves the effect of screening and grading the fish according to the weight, so that it can be processed and sold in subsequent grades without manual screening, thus improving the efficiency of fish screening and grading.

[0037] Example 2

[0038] Please participate Figure 5 A live fish processing and grading device differs from Embodiment 1 in the placement of the receiving frame assembly, the screening mechanism, and the fish frames 4. Each receiving frame assembly is located directly above two adjacent fish frames 4. For details, please refer to [link to Embodiment 1]. Figures 6-7The receiving frame assembly includes an inner baffle 6 fixedly installed on the side of a positioning beam 5. Side baffles 7 are fixedly connected to both ends of the inner baffle 6 away from the positioning beam 5. Outer baffles 8 are fixedly connected to the sides of the two side baffles 7 away from the inner baffle 6. A central rotating shaft 13 is movably fitted at the bottom of the inner baffle 6. A second servo motor 16 is fixedly installed on the outer side of the outer baffle 8. The piston shaft of the second servo motor 16 is fixedly connected to the end of the central rotating shaft 13 away from the inner baffle 6. The central rotating shaft 13 is movably fitted with the outer baffle 8. A movable support plate 14 is fixedly fitted on the outside of the central rotating shaft 13. The two ends of the movable support plate 14 are close to but do not contact the two side baffles 7. The two sides of the movable support plate 14 are movably connected to the sides of the inner baffle 6 and the outer baffle 8, respectively. The second servo motor 16 drives the central rotating shaft 13 to rotate the movable support plate 14 to one side, thereby controlling the fish falling on the movable support plate 14 to fall into the fish frame 4 below with the corresponding fish weight.

[0039] Please see Figures 8-9 The screening mechanism includes a hydraulic cylinder 28 fixedly mounted on a bracket, located directly below the conveyor belt 1. A push shaft 29 is fixedly connected to one end of the piston shaft of the hydraulic cylinder 28. A fourth connecting plate 27 is fixedly connected to the end of the push shaft 29 away from the piston shaft. Third connecting plates 26 are fixedly connected to both ends of the top of the fourth connecting plate 27. Second connecting plates 25 are fixedly connected to the top ends of the two third connecting plates 26. First connecting plates 24 are fixedly connected to both ends of the second connecting plates 25 facing the receiving frame assembly. Positioning horizontal plates 20 are fixedly connected to the ends of the two first connecting plates 24 away from the second connecting plates 25. Positioning horizontal plates 20 are fixedly connected to both ends of the positioning horizontal plates 20 facing the receiving frame assembly. Two limit plates 19 are connected, and each of the ends of the limit plates 19 away from the positioning plate 20 is rotatably fitted with a linkage shaft 18. Each of the two linkage shafts 18 is fixedly fitted with a linkage plate 17. The ends of the two linkage plates 17 away from the linkage shafts 18 are fixedly connected to the two ends of the top of the push plate 11. One end of the positioning plate 20 is fixedly installed with a motor bracket 21 located on one side of the limit plate 19. A third servo motor 22 is fixedly installed on the motor bracket 21. The output shaft of the third servo motor 22 is fixedly connected to one end of the linkage shaft 18. The third servo motor 22 can drive the linkage shaft 18 to drive the linkage plate 17 and the push plate 11 to rotate.

[0040] In use, based on Example 1, the fish is weighed by a weighing platform. Please refer to [link / reference]. Figures 5-9After being weighed, the fish are fed onto conveyor belt 1. When the fish are transported to the receiving frame assembly corresponding to their weight, a hydraulic cylinder 28 drives a piston shaft to retract and move, thereby causing the fourth connecting plate 27, the third connecting plate 26, the second connecting plate 25, the first connecting plate 24, the positioning horizontal plate 20, the limiting horizontal plate 19, the linkage rotating plate 17, and the push plate 11 to move towards one side of the receiving frame assembly. This allows the push plate 11 to push the fish from conveyor belt 1 into the receiving frame assembly. Simultaneously, the second servo motor 16 in the receiving frame assembly drives the intermediate rotating shaft 13 to rotate the movable tray 14, allowing the fish falling into the receiving frame assembly to fall into the fish frame 4 below corresponding to their weight. After the push plate 11 moves to the receiving frame assembly, the third servo motor 22 drives the linkage rotating shaft 18 to rotate the linkage rotating plate 17 and the push plate 11, causing the push plate 11 to move in conjunction with the conveyor belt 1. With the top separated and a certain height space reserved, when the hydraulic cylinder 28 drives the piston shaft to push the push plate 11 away from the receiving frame assembly, the push plate 11 will not affect the subsequent weighing of fish. Compared with the first embodiment, this avoids the impact of the push plate 11's reset movement after pushing the fish to the receiving frame assembly on the subsequent fish conveyed on the conveyor belt 1, thereby improving the fish screening and grading efficiency. Furthermore, if the weight of the next fish on the conveyor belt 1 is the same as the weight of the previous fish, and the previous fish falls into the corresponding fish frame 4, another screening component can push the next fish into the corresponding weight fish frame 4 as well. Thus, without changing the running speed of the push plate 11 of the screening mechanism, the spacing between fish on the conveyor belt 1 can be controlled to be smaller, and the subsequent fish are not affected by the push plate 11 moving away from the receiving frame assembly, further improving the fish screening and grading efficiency.

[0041] Please see Figure 6 , Figure 7 and Figure 10 Two limiting shafts 31 are fixedly connected between the inner baffle 6 and the outer baffle 8. The two limiting shafts 31 are respectively located at both ends of the top of the inner baffle 6. Movable baffles 15 are movably fitted on the two limiting shafts 31. The end of the movable baffle 15 near the limiting shaft 31 is movably connected to the inner side wall of the side baffle 7, and the end of the movable baffle 15 away from the limiting shaft 31 is movably connected to one end of the movable support plate 14. A limiting baffle 23 near the limiting shaft 31 is fixedly installed on the inner wall of the side baffle 7. The limiting baffle 23 supports the movable baffle 15, so that the movable baffle 15 maintains a certain tilt angle. After the movable support plate 14 rotates, the movable baffle 15 ensures that the fish can fall into the fish frame 4 below the receiving frame assembly.

[0042] Please see Figure 8The fourth connecting plate 27 is fixedly connected to the side of the limiting slide shaft 30 located on both sides of the push shaft 29. One end of the limiting slide shaft 30 is movably connected to a crossbeam on the support frame. Through the supporting and limiting function of the limiting slide shaft 30, it is ensured that when the hydraulic cylinder 28 drives the piston shaft to move the push shaft 29, the fourth connecting plate 27, the third connecting plate 26, the second connecting plate 25, the first connecting plate 24, the positioning cross plate 20, the limiting cross plate 19, the linkage rotating plate 17 and the push plate 11 as a whole, they can always maintain a stable state.

Claims

1. A live fish processing and grading device, comprising an adjacent conveying platform and a weighing platform, wherein the conveying platform consists of a support frame and a conveyor belt (1), and the support frame is provided with a first drive motor (2) for driving the conveyor belt (1), characterized in that, The conveyor belt (1) has several equidistantly arranged receiving frame components and screening mechanisms on both sides. The receiving frame components and screening mechanisms correspond one to one. The screening mechanism pushes the weighed fish on the conveyor belt (1) into the receiving frame component of the corresponding weight according to the weighing platform. A fish frame (4) is provided below the receiving frame component. The receiving frame assembly includes an inner baffle (6), with side baffles (7) fixedly connected to both ends of the inner baffle (6) away from the positioning beam (5), and outer baffles (8) fixedly connected to the side of the two side baffles (7) away from the inner baffle (6). A middle rotating shaft (13) is movably fitted at the bottom of the inner baffle (6), and a second servo motor (16) is fixedly installed on the outer side of the outer baffle (8). The piston shaft of the second servo motor (16) is fixedly connected to the end of the middle rotating shaft (13) away from the inner baffle (6). The middle rotating shaft (13) is movably fitted with the outer baffle (8). A movable support plate (14) is fixedly fitted on the outside of the middle rotating shaft (13). The two ends of the movable support plate (14) are close to but not in contact with the two side baffles (7). The two sides of the movable support plate (14) are movably connected to the sides of the inner baffle (6) and the outer baffle (8), respectively. Each receiving frame assembly is located directly above the two adjacent fish frames (4). Two limiting shafts (31) are fixedly connected between the inner baffle (6) and the outer baffle (8). The two limiting shafts (31) are respectively located at both ends of the top of the inner baffle (6). Movable baffles (15) are movably fitted on the two limiting shafts (31). The end of the movable baffle (15) near the limiting shaft (31) is movably connected to the inner wall of the side baffle (7). The end of the movable baffle (15) away from the limiting shaft (31) is movably connected to the end of the movable support plate (14). A limiting baffle (23) near the limiting shaft (31) is fixedly installed on the inner wall of the side baffle (7).

2. The live fish processing screening and grading device according to claim 1, characterized in that, The support frame is fixedly installed with positioning beams (5) on both sides of the conveyor belt (1), and the receiving frame assembly and the screening mechanism are respectively located on one side of the two positioning beams (5).

3. The live fish processing screening and grading device according to claim 1, characterized in that, The screening mechanism includes a positioning horizontal plate (9), one end of which is rotatably fitted with a rotating shaft (10), the top end of which is fixedly connected to a push plate (11), and the top end of the rotating shaft (10) is fixedly connected to one end of the push plate (11). A mounting plate located directly below the positioning horizontal plate (9) is fixedly installed on the support frame, and a first servo motor (12) that drives the rotating shaft (10) to rotate is fixedly installed at the bottom of the mounting plate.

4. The live fish processing screening and grading device according to claim 1, characterized in that, The screening mechanism includes a hydraulic cylinder (28) fixedly mounted on a bracket. The hydraulic cylinder (28) is located directly below the conveyor belt (1). One end of the piston shaft of the hydraulic cylinder (28) is fixedly connected to a push shaft (29). The end of the push shaft (29) away from the piston shaft is fixedly connected to a fourth connecting plate (27). The top two ends of the fourth connecting plate (27) are respectively fixedly connected to third connecting plates (26). The top ends of the two third connecting plates (26) are fixedly connected to second connecting plates (25). The two ends of the second connecting plates (25) facing the receiving frame assembly are fixedly connected to first connecting plates (24). The ends of the two first connecting plates (24) away from the second connecting plates (25) are fixedly connected to positioning horizontal plates (20). Both ends of the plate (20) facing the receiving frame assembly are fixedly connected to the limiting horizontal plates (19). The ends of the two limiting horizontal plates (19) away from the positioning horizontal plate (20) are respectively fitted with linkage shafts (18). Linkage rotating plates (17) are respectively fixedly fitted on the two linkage rotating shafts (18). The ends of the two linkage rotating plates (17) away from the linkage rotating shafts (18) are respectively fixedly connected to the two ends of the top of the push plate (11). A motor bracket (21) located on the side of the limiting horizontal plate (19) is fixedly installed on one end of the positioning horizontal plate (20). A third servo motor (22) is fixedly installed on the motor bracket (21). The output shaft of the third servo motor (22) is fixedly connected to one end of the linkage rotating shaft (18).

5. The live fish processing screening and grading device according to claim 4, characterized in that, The fourth connecting plate (27) is fixedly connected to the side of the limiting slide shaft (30) located on both sides of the push shaft (29), and one end of the limiting slide shaft (30) is movably connected to a crossbeam on the support frame.

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