Fish feed grinding device and grinding method thereof

Abstract

The present application relates to the technical field of crushing device, specifically to a fish feed crushing device, which comprises a device shell, the surface of the device shell is rotationally connected with a plurality of vertically stacked sieve plates, and the plurality of sieve plates separate the interior of the device shell into two chambers, the upper end of the sieve plate is a crushing chamber, and the lower end of the sieve plate is a discharge chamber, the upper end of the crushing chamber is provided with a channel opening for feeding, and a crushing assembly is installed in the crushing chamber, the size of the discharged particles is controlled by rotating the sieve plate below the crushing assembly, the surface of the device shell is rotationally connected with a limiting stopper for limiting the rotation of the sieve plate, the uppermost sieve plate is a top sieve plate, and the lowermost sieve plate is a bottom sieve plate, the present application aims to solve the problem that the existing crusher usually replaces the screen mesh to change the size of the screen hole, and the replacement process is complicated and inconvenient to use.

Description

Technical Field

[0001] This invention relates to the field of pulverizing equipment technology, specifically to a fish feed pulverizing device and its pulverizing method. Background Technology

[0002] Fish feed, as the name suggests, is feed for fish. Its main components are protein, fat, vitamins and minerals. Protein is an important nutrient for the survival of fish and shrimp. It is an important component of body cells, tissues and organs. When fish do not get enough protein, they grow slowly, have a weakened immune system, slow tissue regeneration, poor wound healing and are more susceptible to disease.

[0003] Before processing compound feed, the raw materials must be pulverized according to requirements. This is because fish have a relatively simple digestive system, and food stays in the intestines for a short time. If the raw material particles are large, they are not easily digested and absorbed. Pulverization reduces the particle size of the material, increases the exposed surface area of ​​the raw material, and thus increases the contact area between digestive enzymes and the raw material, promoting the digestion of nutrients in the feed. In addition, fish are special because they feed in water, which requires the feed to have good water stability and not disintegrate for a period of time. If the raw materials are not pulverized according to regulations, it will affect the subsequent pelleting process. Poor feed binding properties will reduce the stability of feed pellets in water. Pulverization can improve the binding force between raw materials, making pelleting easier and improving feed stability in water, while reducing the loss rate of nutrients.

[0004] When feed pellets are too large, feeding them to fish may affect their digestion and absorption. Different fish species and different growth stages have different digestive and absorption capabilities. Therefore, the size of feed pellets is required for different fish species and different growth stages. Existing grinders usually change the size of the screen holes by changing the screen mesh to control the size of the feed pellets after grinding. However, the replacement process usually requires disassembling the outer casing of the device, which is cumbersome and inconvenient to use. Summary of the Invention

[0005] The purpose of this invention is to provide a fish feed grinding device and grinding method to solve the problem that existing grinders usually require changing the screen mesh to change the size of the screen holes, which is a cumbersome process and inconvenient to use.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fish feed grinding device includes a housing. Multiple vertically stacked screen plates are rotatably connected to the surface of the housing, dividing the interior of the housing into two chambers: a grinding chamber at the upper end of the screen plates and a discharge chamber at the lower end. The upper end of the grinding chamber has a feed inlet, and a grinding assembly is installed within it. The size of the discharged particles is controlled by rotating the screen plates below the grinding assembly. Limiting stops restricting the rotation of the screen plates are rotatably connected to the surface of the housing. The uppermost screen plate is designated as the top screen plate, the lowermost screen plate as the bottom screen plate, and the screen plate between the top and bottom screen plates as the intermediate screen plate.

[0008] Preferably, the device housing includes support feet, a discharge box, a rotating shaft, and a crushing box. There are multiple support feet, all of which are fixed to the bottom of the discharge box. The support feet are used to support the device housing. The discharge chamber is located on the discharge box and is used for discharging fish feed. The rotating shaft is fixed to the top of the discharge box. The crushing box is fixed to the top of the rotating shaft. The screen plate is located between the discharge box and the crushing box. The rotating shaft moves through each screen plate.

[0009] Preferably, the crushing assembly includes a motor, a crushing shaft, and a crushing blade. The motor is fixedly installed on the surface of the crushing chamber, the crushing shaft is rotatably connected to the inner wall of the crushing chamber, and the output end of the motor is coaxially and fixedly connected to one end of the crushing shaft. The crushing blade is fixedly installed on the surface of the crushing shaft.

[0010] Preferably, the top screen plate is composed of a first left plate, a first middle plate, and a first right plate, with the first left plate and the first right plate having the same length, width, and height, and are respectively disposed on both sides of the first middle plate. The middle screen plate is composed of a second left plate, a second middle plate, and a second right plate, with the second left plate and the second right plate having the same length, width, and height, and are respectively disposed on both sides of the second middle plate. The bottom screen plate is composed of a third left plate, a third middle plate, and a third right plate, with the third left plate and the third right plate having the same length, width, and height, and are respectively disposed on both sides of the third middle plate. The rotating shaft sequentially moves through the center of the first middle plate, the second middle plate, and the third middle plate. The top of each of the first left plate, the second left plate, and the third left plate is provided with a positioning groove. A shaping ring is installed on the inner wall of each positioning groove, and a screen is fixedly connected to the inner wall of each shaping ring.

[0011] Preferably, the shaping ring on the first left plate is fixedly connected to the first left plate, and the outer ring wall of the shaping ring on the second left plate and the third left plate is fixedly connected to a connecting rod. The end of each connecting rod is horizontally rotatably connected to a rotating rod. The surfaces of the second left plate and the third left plate are provided with placement grooves for the rotating rod and the connecting rod to move up and down.

[0012] Preferably, the surface of the first right plate is provided with a first clearance hole for the shaping ring to pass through, the bottom end of the first right plate is provided with an embedding groove for the connecting rod and the rotating rod to be embedded, and the embedding groove is connected to the first clearance hole. The wall of the embedding groove is provided with a limiting groove for the rotating rod to be embedded. The surface of the second right plate is provided with a second clearance hole for the shaping ring, the connecting rod and the rotating rod to pass through, and the surface of the third right plate is provided with a third clearance hole, and the diameter of the third clearance hole is larger than the diameter of the shaping ring.

[0013] Preferably, a docking shaft is fixedly connected to one side of each of the first left plate, the second left plate, the third left plate, the first right plate, the second right plate, and the third right plate. A protrusion is fixedly connected to the surface of each docking shaft. Both sides of the first middle plate, the second middle plate, and the third middle plate are provided with docking grooves for the docking shaft and the protrusion to be inserted. The bottom wall of each docking groove is provided with a circular groove for the protrusion to rotate.

[0014] Preferably, a T-shaped block is fixedly connected to one side of each of the first left plate, the second left plate, the third left plate, the first right plate, the second right plate, and the third right plate, and T-shaped grooves for embedding the T-shaped blocks are formed on both sides of the first middle plate, the second middle plate, and the third middle plate.

[0015] Preferably, the surface of the discharge box is equipped with a storage box for storing the sieve plate.

[0016] A method for grinding fish feed, using the aforementioned fish feed grinding device, comprises the following steps:

[0017] A. First, rotate the limiting stop to move it away from the screen plate. Then, rotate one of the screen plates so that its screen is located between the discharge box and the crushing box, while the screens on the remaining screen plates are located outside the outer shell of the device. Then, rotate the limiting stop back to its original position.

[0018] B. If the screen on the screen plate below the top screen plate is located between the discharge box and the crushing box, you can hold the rotating rod on it and lift it up to move the screen upward. When the rotating rod moves upward and is aligned with the limiting groove, rotate the rotating rod horizontally so that the rotating rod is embedded in the limiting groove to fix the screen. At this time, the screen is brought to the position of the first clearance hole.

[0019] C. Next, start the motor to drive the crushing shaft to rotate. The rotation of the crushing shaft drives the crushing blades to rotate. Then, put the fish feed raw materials into the crushing box. The fish feed raw materials are crushed by the high-speed rotating crushing blades. When the size of the crushed pellets is smaller than the mesh size of the screen, the crushed pellets will fall through the screen into the discharge box and then be discharged from the discharge box.

[0020] D. The sieve plate portion located on the outside of the device casing can be separated from the rest of the sieve plate. The separated portion can be placed in a storage box for convenient use.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By setting up rotatable screen plates, each screen plate uses a screen with a different mesh size, and by rotating the screen plate, the screen on one screen plate is located below the crushing component, while the screens on the surface of the other screen plates are located outside the outer shell of the device. This allows control over the particle size of the fish feed after crushing. The process of changing the screen plate is simple and convenient to operate.

[0023] 2. With the addition of connecting rods and rotating rods, when using the screen on the middle or bottom screen plate, rotating the middle or bottom screen plate will position the screen below the crushing device. By lifting the rotating rod upwards, the corresponding connecting rod, shaping ring, and screen can be moved to the height of the first right plate. Then, rotating the rotating rod will cause it to embed into the limiting groove, which will fix the shaping ring and screen. At this time, the screen is closest to the crushing component, which helps to prevent the fish feed located between the crushing component and the screen from being crushed due to the distance between the screen and the crushing component.

[0024] 3. By setting the sieve plate into three detachable parts, the sieve plate part inside the device housing can be removed, which helps to prevent the sieve plate part inside the device housing from protruding horizontally and occupying a large space, thus avoiding space waste. Attached Figure Description

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

[0026] Figure 2 This is a cross-sectional structural diagram of the crushing box of the present invention;

[0027] Figure 3 This is a schematic diagram of the discharge box of the present invention;

[0028] Figure 4 This is a schematic diagram of the cross-section of the sieve plate of the present invention;

[0029] Figure 5 This is a schematic diagram of the cross-section of the top sieve plate of the present invention;

[0030] Figure 6 This is a schematic diagram of the cross-section of the intermediate sieve plate of the present invention;

[0031] Figure 7 This is a schematic diagram of the bottom sieve plate of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the storage box of the present invention;

[0033] Figure 9 This is a schematic diagram of the first connection embodiment of the sieve plate of the present invention;

[0034] Figure 10 For the present invention Figure 9 Enlarged view of point A in the middle;

[0035] Figure 11 This is a schematic diagram of a second connection embodiment of the sieve plate of the present invention.

[0036] In the diagram: 1. Support foot; 2. Discharge box; 3. Rotating shaft; 4. Crushing box; 5. Motor; 6. Crushing shaft; 7. Crushing blade; 8. Top screen plate; 9. Middle screen plate; 10. Bottom screen plate; 11. Limiting stop; 12. Storage box; 13. Shaping ring; 14. Screen; 15. Positioning groove; 16. First clearance hole; 17. Embedding groove; 18. Limiting groove; 19. Second clearance hole; 20. Placement groove ; 21. Connecting rod; 22. Rotating rod; 23. Third clearance hole; 24. First left plate; 25. First middle plate; 26. First right plate; 27. Second left plate; 28. Second middle plate; 29. ​​Second right plate; 30. Third left plate; 31. Third middle plate; 32. Third right plate; 33. Connecting shaft; 34. Protrusion; 35. Connecting groove; 36. Circular groove; 37. T-block; 38. T-groove. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figures 1 to 10 The present invention provides a technical solution:

[0039] A fish feed grinding device includes a housing. Multiple vertically stacked screen plates are rotatably connected to the surface of the housing. Each screen plate has a different mesh size, and the screen plates divide the interior of the housing into two chambers: a grinding chamber at the upper end of the screen plates and a discharge chamber at the lower end. A feed inlet is located at the upper end of each grinding chamber, and a grinding component is installed within the grinding chamber. The size of the discharged particles is controlled by rotating the screen plates below the grinding component. Because each screen plate has a different mesh size, rotating the screen plate to position it below the grinding component allows for the grinding of the corresponding particle size. For pelleted feed of various mesh sizes, the outer shell of the device is rotatably connected to a limiting stop 11 that restricts the rotation of the sieve plate. The limiting stop 11 can vertically contact the side of the sieve plate. By setting the limiting stop 11 at both the front and rear ends of the device shell, the sieve plate can be blocked, preventing it from rotating. This limits the sieve plate and prevents it from rotating during device operation. The sieve plate at the top is called the top sieve plate 8, the sieve plate at the bottom is called the bottom sieve plate 10, and the sieve plate between the top sieve plate 8 and the bottom sieve plate 10 is called the middle sieve plate 9. The surface structure of all sieve plates between the top sieve plate 8 and the bottom sieve plate 10 is the same.

[0040] Furthermore, the device housing includes support feet 1, a discharge box 2, a rotating shaft 3, and a crushing box 4. Multiple support feet 1 are fixed to the bottom of the discharge box 2, supporting the device housing. The discharge chamber is located on the discharge box 2 for discharging fish feed. The discharge chamber on the discharge box 2 creates two interconnected openings on its surface. The rotating shaft 3 is fixed to the top of the discharge box 2, and the crushing box 4 is fixed to the top of the rotating shaft 3. A sieve plate is located between the discharge box 2 and the crushing box 4, with the rotating shaft 3 movably passing through each sieve plate. The crushing assembly includes a motor 5, a crushing shaft 6, and crushing blades 7. The motor 5 is fixedly mounted on the surface of the crushing box 4. The crushing shaft 6 is rotatably connected to the inner wall of the crushing box 4, and the output end of the motor 5 is coaxially fixedly connected to one end of the crushing shaft 6. The crushing blades 7 are fixedly mounted on the surface of the crushing shaft 6. By starting the motor 5, the crushing shaft 6 and crushing blades 7 rotate at high speed, crushing the raw materials by cutting them with the crushing blades 7.

[0041] Furthermore, the top screen plate 8 is composed of a first left plate 24, a first middle plate 25, and a first right plate 26, with the first left plate 24 and the first right plate 26 having the same length, width, and height, ensuring that either the first left plate 24 or the first right plate 26 can rotate between the discharge box 2 and the crushing box 4. The second left plate 27 and the second right plate 29, and the third left plate 30 and the third right plate 32, are similarly positioned on either side of the first middle plate 25. The middle screen plate 9 is composed of a second left plate 27, a second middle plate 28, and a second right plate 29, with the second left plate 27 and the second right plate 29 having the same length, width, and height, and positioned on either side of the second middle plate 28. The bottom screen plate 10 is composed of a third left plate 30, a third middle plate 31, and a third right plate 32. The left plate 30 and the third right plate 32 have the same length, width and height, and are respectively set on both sides of the third middle plate 31. The rotating shaft 3 moves through the center of the first middle plate 25, the second middle plate 28 and the third middle plate 31 in sequence, so that the relative positions of the first middle plate 25, the second middle plate 28 and the third middle plate 31 do not change after rotation. The top of the first left plate 24, the second left plate 27 and the third left plate 30 are all provided with positioning grooves 15. The inner wall of each positioning groove 15 is equipped with a shaping ring 13. The inner wall of each shaping ring 13 is fixedly connected with a screen 14. The shaping ring 13 and the screen 14 can be set to be flush with the upper surface of the screen plate to prevent the fish feed located between the crushing component and the screen 14 from being crushed.

[0042] Furthermore, the shaping ring 13 on the first left plate 24 is fixedly connected to the first left plate 24. Since this shaping ring 13 is already at the top, it does not need to be moved. Moreover, there are no other screen plates limiting the upper surface. If it is not fixed, it is easy to fall off the first left plate 24. The outer ring walls of the shaping ring 13 on the second left plate 27 and the third left plate 30 are fixedly connected with connecting rods 21. The end of each connecting rod 21 is horizontally rotatably connected with a rotating rod 22. The surfaces of the second left plate 27 and the third left plate 30 are provided with placement grooves 20 for the rotating rod 22 and the connecting rod 21 to move up and down. The shaping rings 13 on the screen plate below the top screen plate 8 are all movably connected, so that the shaping rings 13 and the screen 14 on this screen plate can be moved to the position of the top screen plate 8 when in use. This is the position closest to the crushing component.

[0043] Furthermore, the surface of the first right plate 26 is provided with a first clearance hole 16 for the shaping ring 13 to pass through, so that when the shaping ring 13 is located at the position of the first clearance hole 16, the inner surface of the first clearance hole 16 is in contact with the outer surface of the shaping ring 13, preventing the raw material from not passing through the screen 14. The bottom end of the first right plate 26 is provided with an embedding groove 17 for the connecting rod 21 and the rotating rod 22 to be embedded, and the embedding groove 17 is interconnected with the first clearance hole 16. The wall of the embedding groove 17 is provided with a limiting groove 18 for the rotating rod 22 to be embedded. When the rotating rod 22 is embedded in the limiting groove 18, the connecting rod 21, the shaping ring 13, and the screen 14 will be unable to move up and down, thereby fixing the shaping ring 13 and the screen 14. The rotating rod 22 is in contact with the wall of the limiting groove 18. The surface of the second right plate 29 is provided with a second clearance hole 19 for the shaping ring 13, the connecting rod 21, and the rotating rod 22 to pass through. The surface of the third right plate 32 is provided with a third clearance hole 23, and the diameter of the third clearance hole 23 is larger than the diameter of the shaping ring 13, ensuring that the crushed feed particles can fall smoothly.

[0044] Furthermore, a docking shaft 33 is fixedly connected to one side of each of the first left plate 24, the second left plate 27, the third left plate 30, the first right plate 26, the second right plate 29, and the third right plate 32. A protrusion 34 is fixedly connected to the surface of each docking shaft 33. The two sides of the first middle plate 25, the second middle plate 28, and the third middle plate 31 are provided with docking grooves 35 for the docking shafts 33 and the protrusions 34 to be inserted. The bottom wall of each docking groove 35 is provided with a circular groove 36 for the protrusions 34 to rotate. This allows the screen plate to be divided into three parts. The middle part is inconvenient to rotate back and forth. The left and right parts can be swapped. Through the detachable design, the part of the screen plate located on the outside of the device housing can be removed for easy storage or replacement. A storage box 12 is installed on the surface of the discharge box 2. The storage box 12 is used to store the screen plate.

[0045] The specific implementation scheme of this embodiment is as follows: First, the first left plate 24, the second left plate 27 and the third left plate 30 are located on the left side of the discharge box 2 and the crushing box 4, and the first middle plate 25, the first right plate 26, the second middle plate 28, the second right plate 29, the third middle plate 31 and the third right plate 32 are all located between the discharge box 2 and the crushing box 4.

[0046] First, rotate the limiting stop 11 to move it away from the screen plate. When the top screen plate 8 is rotated, it will rotate around the rotating shaft 3, causing the first right plate 26 to rotate to the left side of the discharge box 2 and the crushing box 4. The first left plate 24, the shaping ring 13 on the first left plate 24, and the screen 14 will rotate to the space between the discharge box 2 and the crushing box 4. Then, rotate the limiting stop 11 back to its original position to limit the screen plate and prevent it from rotating during the operation of the device. Next, start the motor 5 to drive the crushing shaft 6 to rotate. The rotation of the crushing shaft 6 drives the crushing blade 7 to rotate. Then, put the fish feed raw material into the crushing box 4. The fish feed raw material is crushed by the high-speed rotating crushing blade 7. When the size of the crushed pellets is smaller than the mesh size of the screen 14 on the first left plate 24, the crushed pellets will fall through the screen 14 into the discharge box 2 and then be discharged from the discharge box 2.

[0047] When the screen plate needs to be replaced, rotate the limiting stop 11 to move it away from the screen plate. Then, first rotate the top screen plate 8 to move the first right plate 26 between the discharge box 2 and the crushing box 4. Next, rotate the middle screen plate 9 to move the second left plate 27, the shaping ring 13 on the second left plate 27, and the screen 14 between the discharge box 2 and the crushing box 4. Then, rotate the limiting stop 11 back to its original position. At this time, you can hold the rotating rod 22 on the second left plate 27 and lift it upwards to drive the corresponding connected rod 21, the shaping ring 13, and the screen 14. 4. Move upwards. The rotating rod 22 and the connecting rod 21 first move out of the placement groove 20 and then embed into the embedding groove 17. When the rotating rod 22 moves upwards and aligns with the limiting groove 18, rotate the rotating rod 22 horizontally so that the rotating rod 22 is embedded into the limiting groove 18 to fix the connecting rod 21, the shaping ring 13, and the screen 14. At this time, the shaping ring 13 and the screen 14 are brought to the position of the first clearance hole 16. Finally, feed the raw materials according to the same steps as above. Since the screen plate has been replaced, the size of the crushed pellet feed will change.

[0048] When it is necessary to replace the bottom screen plate 10, follow the same steps as above to rotate the first right plate 26, the second right plate 29, the third left plate 30 and the shaping ring 13 and screen 14 on the third left plate 30 to the space between the discharge box 2 and the crushing box 4. At this time, lift the rotating rod 22 on the third left plate 30 upwards. The shaping ring 13 and screen 14 connected to it will first pass through the second clearance hole 19 and then move to the position of the first clearance hole 16.

[0049] The first left plate 24 or the first right plate 26, the second left plate 27 or the second right plate 29, and the third left plate 30 or the third right plate 32 located on the left side of the discharge box 2 and the crushing box 4 can be rotated around the docking shaft 33, so that the protrusion 34 rotates in the circular groove 36 until the protrusion 34 is aligned with the docking groove 35. At this time, the screen plate part located on the left side of the discharge box 2 and the crushing box 4 can be pulled horizontally, so that the docking shaft 33 and the protrusion 34 are moved out of the docking groove 35, and the screen plate part located on the left side of the discharge box 2 and the crushing box 4 can be separated from the rest of the screen plate. The separated part can be placed in the storage box 12 for convenient use.

[0050] Example 2: Please refer to Figures 1 to 7 and Figure 11 The difference between Example 2 and Example 1 lies in the method of disassembling each sieve plate:

[0051] Furthermore, a T-shaped block 37 is fixedly connected to one side of the first left plate 24, the second left plate 27, the third left plate 30, the first right plate 26, the second right plate 29, and the third right plate 32, and T-shaped grooves 38 for the T-shaped blocks 37 to be inserted are provided on both sides of the first middle plate 25, the second middle plate 28, and the third middle plate 31.

[0052] The disassembly scheme for each sieve plate in this embodiment is as follows: the sieve plate part located on the left side of the discharge box 2 and the crushing box 4 can be moved horizontally so that the T-shaped block 37 moves along the track of the T-shaped groove 38 until it is removed from the T-shaped groove 38, thereby separating the sieve plate part located on the left side of the discharge box 2 and the crushing box 4 from the rest of the sieve plate. The rest of the scheme in this embodiment is the same as in embodiment one.

[0053] A method for grinding fish feed, using a fish feed grinding device, includes the following specific steps:

[0054] A. First, rotate the limiting stop 11 to move it away from the screen plate. Then, rotate one of the screen plates so that the screen 14 on it is located between the discharge box 2 and the crushing box 4. The screen 14 on the remaining screen plates is located outside the outer shell of the device. Then rotate the limiting stop 11 back to its original position.

[0055] B. If the screen 14 on the screen plate below the top screen plate 8 is located between the discharge box 2 and the crushing box 4, the rotating rod 22 on it can be held and lifted upward to move the screen 14 upward. When the rotating rod 22 moves upward to align with the limiting groove 18, the rotating rod 22 is rotated horizontally so that the rotating rod 22 is embedded in the limiting groove 18 to fix the screen 14. At this time, the screen 14 is brought to the position of the first clearance hole 16.

[0056] C. Next, start motor 5 to drive the crushing shaft 6 to rotate. The rotation of crushing shaft 6 drives the crushing blade 7 to rotate. Then, put the fish feed raw materials into the crushing box 4. The fish feed raw materials are crushed by the high-speed rotating crushing blade 7. When the size of the crushed pellets is smaller than the mesh size of screen 14, the crushed pellets will fall through screen 14 into the discharge box 2 and then be discharged from the discharge box 2.

[0057] D. The sieve plate portion located on the outside of the device housing can be separated from the rest of the sieve plate, and the separated portion can be placed in the storage box 12 for convenient use.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fish feed grinding device, comprising a device housing, characterized in that: The surface of the device housing is rotatably connected to multiple vertically stacked screen plates, and the multiple screen plates divide the interior of the device housing into two chambers. The upper part of the screen plate is the crushing chamber, and the lower part of the screen plate is the discharge chamber. The upper end of the crushing chamber is provided with a feeding channel, and a crushing component is installed in the crushing chamber. The size of the discharged particles is controlled by rotating the screen plate below the crushing component. The surface of the device housing is rotatably connected to a limiting stop (11) that restricts the rotation of the screen plate. The uppermost screen plate is designated as the top screen plate (8), the lowermost screen plate is designated as the bottom screen plate (10), and the screen plate between the top screen plate (8) and the bottom screen plate (10) is designated as the middle screen plate (9). The outer casing of the device includes a support foot (1), a discharge box (2), a rotating shaft (3), and a crushing box (4); The crushing assembly includes a motor (5), a crushing shaft (6), and a crushing blade (7); The top sieve plate (8) is composed of a first left plate (24), a first middle plate (25), and a first right plate (26), with the first left plate (24) and the first right plate (26) having the same length, width, and height, and are respectively located on both sides of the first middle plate (25). The middle sieve plate (9) is composed of a second left plate (27), a second middle plate (28), and a second right plate (29), with the second left plate (27) and the second right plate (29) having the same length, width, and height, and are respectively located on both sides of the second middle plate (28). The bottom sieve plate (10) is composed of a third left plate (30), a third middle plate (31), and a third right plate (29). The plate (32) is composed of a third left plate (30) and a third right plate (32) with the same length, width and height, and is respectively set on both sides of the third middle plate (31). The rotating shaft (3) moves through the center of the first middle plate (25), the second middle plate (28) and the third middle plate (31) in sequence. The top of the first left plate (24), the second left plate (27) and the third left plate (30) are all provided with positioning grooves (15). The inner wall of each positioning groove (15) is equipped with a shaping ring (13). The inner wall of each shaping ring (13) is fixedly connected with a screen (14). The shaping ring (13) on the first left plate (24) is fixedly connected to the first left plate (24). The outer ring wall of the shaping ring (13) on the second left plate (27) and the third left plate (30) is fixedly connected to the connecting rod (21). The end of each connecting rod (21) is horizontally rotatably connected to the rotating rod (22). The surfaces of the second left plate (27) and the third left plate (30) are provided with placement grooves (20) for the rotating rod (22) and the connecting rod (21) to move up and down.

2. The fish feed grinding device according to claim 1, characterized in that, The number of the support feet (1) is multiple and they are all fixed to the bottom of the discharge box (2). The support feet (1) are used to support the outer shell of the device. The discharge chamber is set on the discharge box (2) for discharging fish feed. The rotating shaft (3) is fixed to the top of the discharge box (2). The crushing box (4) is fixed to the top of the rotating shaft (3). The screen plate is located between the discharge box (2) and the crushing box (4). The rotating shaft (3) moves through each screen plate.

3. The fish feed grinding device according to claim 2, characterized in that, The motor (5) is fixedly installed on the surface of the crushing box (4), the crushing shaft (6) is rotatably connected to the inner wall of the crushing box (4), and the output end of the motor (5) is coaxially fixedly connected to one end of the crushing shaft (6). The crushing blade (7) is fixedly installed on the surface of the crushing shaft (6).

4. The fish feed grinding device according to claim 3, characterized in that, The surface of the first right plate (26) is provided with a first clearance hole (16) for the shaping ring (13) to pass through. The bottom end of the first right plate (26) is provided with an embedding groove (17) for the connecting rod (21) and the rotating rod (22) to be embedded. The embedding groove (17) is connected to the first clearance hole (16). The wall of the embedding groove (17) is provided with a limiting groove (18) for the rotating rod (22) to be embedded. The surface of the second right plate (29) is provided with a second clearance hole (19) for the shaping ring (13), the connecting rod (21), and the rotating rod (22) to pass through. The surface of the third right plate (32) is provided with a third clearance hole (23), and the diameter of the third clearance hole (23) is larger than the diameter of the shaping ring (13).

5. The fish feed grinding device according to claim 4, characterized in that, One side of the first left plate (24), the second left plate (27), the third left plate (30), the first right plate (26), the second right plate (29), and the third right plate (32) are all fixedly connected with a docking shaft (33). Each docking shaft (33) is fixedly connected with a protrusion (34). Both sides of the first middle plate (25), the second middle plate (28), and the third middle plate (31) are provided with docking grooves (35) for the docking shaft (33) and the protrusion (34) to be inserted. The bottom wall of each docking groove (35) is provided with a circular groove (36) for the protrusion (34) to rotate.

6. The fish feed grinding device according to claim 4, characterized in that, One side of the first left plate (24), the second left plate (27), the third left plate (30), the first right plate (26), the second right plate (29), and the third right plate (32) are all fixedly connected with T-shaped blocks (37), and the two sides of the first middle plate (25), the second middle plate (28), and the third middle plate (31) are all provided with T-shaped grooves (38) for the T-shaped blocks (37) to be inserted.

7. A fish feed grinding device according to any one of claims 5-6, characterized in that, The surface of the discharge box (2) is equipped with a storage box (12), which is used to store the sieve plate.

8. A method for grinding fish feed, characterized in that, The fish feed grinding device described in claim 7 is used, and the specific steps are as follows: A. First, rotate the limiting stop (11) to move the limiting stop (11) away from the screen plate. Then, rotate one of the screen plates so that the screen (14) on it is located between the discharge box (2) and the crushing box (4). The screen (14) on the remaining screen plates is located outside the outer shell of the device. Then rotate the limiting stop (11) back to its original position. B. If the screen (14) on the screen plate below the top screen plate (8) is located between the discharge box (2) and the crushing box (4), you can hold the rotating rod (22) on it and lift it up to drive the screen (14) to move upward. When the rotating rod (22) moves upward and aligns with the limiting groove (18), rotate the rotating rod (22) horizontally so that the rotating rod (22) is embedded in the limiting groove (18) to fix the screen (14). At this time, the screen (14) is brought to the position of the first clearance hole (16). C. Next, start the motor (5) to drive the crushing shaft (6) to rotate. The rotation of the crushing shaft (6) drives the crushing blade (7) to rotate. Then, put the fish feed raw materials into the crushing box (4). The fish feed raw materials are crushed by the high-speed rotating crushing blade (7). When the size of the crushed pellets is smaller than the mesh size of the screen (14), the crushed pellets will fall through the screen (14) into the discharge box (2) and then be discharged from the discharge box (2). D. The sieve plate part located on the outside of the device housing can be separated from the rest of the sieve plate. The separated part can be placed in the storage box (12) for easy use.

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