A shrimp culture wastewater recycling treatment device

Abstract

The application discloses a kind of shrimp culture wastewater's cyclic processing equipment, it is related to wastewater treatment technical field, including breeding pond, the bottom end of the breeding pond is fixedly connected with drain pipe, the inner wall bottom end of the breeding pond is fixedly connected with support column, filter cartridge, moving mechanism, brush mechanism.The application is provided with moving mechanism and brush mechanism, fourth spur gear is contacted with fifth spur gear, motor operation drives screw rod to rotate, screw rod rotation drives connecting rod to displace, drives filter cartridge to carry out up and down displacement operation;When the through hole on filter cartridge is blocked, hydraulic cylinder operation drives movable seat to displace, fourth spur gear displacement is contacted with sixth spur gear, while brush rod moves downward and is contacted with the outer wall of filter cartridge;Motor operation drives filter cartridge to rotate, and the surface of filter cartridge is brushed and cleaned by brush rod, it is convenient to automatically control filter cartridge to carry out up and down displacement operation, and the surface of filter cartridge is cleaned automatically.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically a recycling treatment device for shrimp farming wastewater. Background Technology

[0002] Shrimp farming refers to the process of raising and producing shrimp, a species with high economic value, in water bodies such as ponds, net cages, paddy fields, and greenhouses using artificial methods. The purpose is to obtain commercial shrimp for consumption, sale, or breeding. Based on the type of water body, it can be divided into freshwater shrimp farming and marine shrimp farming. Based on the degree of intensification, it can be divided into three modes: extensive farming, semi-intensive farming, and intensive farming. Wastewater is generated during shrimp farming, usually called "aquaculture tailwater." This wastewater mainly comes from water exchange, drainage, and pond dredging during the farming process and contains shrimp excrement, leftover feed, dead algae, and chemical agents (such as disinfectants and antibiotics).

[0003] When treating wastewater, the water in the aquaculture pond needs to be discharged through a drainage structure. After solid-liquid separation, biological purification, nitrification, denitrification and phosphorus removal, deep purification and disinfection, the purified water meets the standards and is then reused in the aquaculture pond. When the water is discharged, the water in the aquaculture pond continuously enters the drain pipe through the filter cartridge. When large impurities and shrimp shells accumulated in the aquaculture pond are discharged, the filter cartridge moves upward, allowing the feces and shrimp shells in the aquaculture pond to directly enter the drain pipe.

[0004] When moving the filter cylinder, it is necessary to manually pull it up with a rope to discharge the shrimp shells and large debris. After that, the filter cylinder is lowered and reset by the gravity of the counterweight. This operation is quite laborious. At the same time, during the use of the filter cylinder, impurities can easily clog the holes on the filter cylinder, thereby affecting the discharge of water and thus affecting the recycling of wastewater. In order to facilitate the movement and cleaning of the filter cylinder, a recycling treatment device for shrimp farming wastewater is provided. Summary of the Invention

[0005] The purpose of this invention is to provide a recycling treatment device for shrimp farming wastewater in order to facilitate the movement and cleaning of the filter cartridge.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wastewater recycling treatment device for shrimp farming, comprising a farming pond, a drain pipe fixedly connected to the bottom of the farming pond, a support column fixedly connected to the bottom of the inner wall of the farming pond, a filter cylinder slidably fitted onto the outer wall of the support column, a through hole being formed in the outer wall of the filter cylinder, a vertical groove being formed at the bottom of the support column, and a cavity communicating with the drain pipe being formed at the bottom of the support column. The filter cylinder is displaced by a moving mechanism, and the surface of the filter cylinder is cleaned by a brushing mechanism. The moving mechanism includes a top plate fixedly connected to the top of the support column, an mounting plate fixedly connected to one side of the top plate, a hydraulic cylinder mounted on the outer wall of the mounting plate, a movable seat connected to the output end of the hydraulic cylinder, a motor mounted on the top of the movable seat, and a fourth spur gear connected to the output end of the motor.

[0007] As a further embodiment of the present invention: the moving mechanism further includes a connecting seat, the connecting seat being fixedly connected to the bottom end of the top plate and located on one side of the support column, a connecting rod extending to the bottom of the connecting seat being slidably connected to the inner wall of the connecting seat, a movable ring being fixedly connected to the bottom end of the connecting rod, the movable ring being slidably connected to the outer wall of the support column, a connecting ring being fixedly connected to the top end of the filter cylinder, the connecting ring being rotatably connected to the inside of the movable ring, a fifth spur gear being rotatably connected to the top end of the top plate located on one side of the fourth spur gear, a threaded rod being fixedly connected to the bottom end of the fifth spur gear, the threaded rod extending to the inside of the connecting rod.

[0008] As a further embodiment of the present invention: the brushing mechanism includes a mounting frame, which is fixedly connected to the top plate on the side away from the mounting plate. A second spur gear is rotatably connected to the top of the mounting frame. A first spur gear is symmetrically fixedly connected to both ends of the second spur gear. A toothed rod is symmetrically fixedly connected to the outer wall of the movable seat. The toothed rod is in contact with the first spur gear. A displacement rod is provided on the outer wall of the second spur gear. The displacement rod passes through the top plate and is slidably connected to the top plate. A brush rod is fixedly connected to the bottom end of the displacement rod. A brush for cleaning the filter cartridge is provided on the outer wall of the brush rod.

[0009] As a further embodiment of the present invention: the brushing mechanism further includes a sixth spur gear, which is rotatably connected to the top of the top plate. A square rod is slidably connected to the inner wall of the sixth spur gear. A connecting shaft is fixedly connected to the bottom end of the square rod. The connecting shaft is rotatably connected to the movable ring. A third spur gear is fixedly connected to the bottom end of the connecting shaft. The third spur gear is in contact with the connecting ring.

[0010] As a further embodiment of the present invention: the fourth spur gear meshes with the fifth spur gear, and the outer wall of the connecting rod is in contact with the inner wall of the connecting seat.

[0011] As a further embodiment of the present invention: the top end of the connecting rod is provided with a threaded hole, the threaded hole is matched with the threaded rod, and the inner wall of the movable ring is in contact with the outer wall of the support column.

[0012] As a further embodiment of the present invention: a first tooth groove is provided at the top of the rack, and the first tooth groove meshes with the first spur gear.

[0013] As a further embodiment of the present invention: the outer wall of the displacement rod is provided with a second toothed groove, the second toothed groove meshing with the second spur gear, and the top end of the top plate is provided with a displacement groove for the displacement rod to slide.

[0014] As a further embodiment of the present invention: the fourth spur gear meshes with the sixth spur gear, and the outer wall of the connecting ring is provided with a third tooth groove, which meshes with the third spur gear.

[0015] As a further embodiment of the present invention: the outer wall of the sixth spur gear is provided with a square groove, and the inner wall of the square groove is in contact with the outer wall of the square rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By setting up a moving mechanism and a brushing mechanism, the fourth spur gear contacts the fifth spur gear, the motor drives the threaded rod to rotate, the rotation of the threaded rod drives the connecting rod to move, and the filter cylinder moves up and down. When the through hole on the filter cylinder is blocked, the hydraulic cylinder drives the movable seat to move, the fourth spur gear moves and contacts the sixth spur gear, and at the same time the brush rod moves downward and contacts the outer wall of the filter cylinder. The motor drives the filter cylinder to rotate, and the brush rod brushes and cleans the surface of the filter cylinder, which facilitates automatic control of the filter cylinder's up and down movement and automatic cleaning of the filter cylinder's surface. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the aquaculture pond of the present invention;

[0020] Figure 3 This is a cross-sectional view of the filter cartridge of the present invention;

[0021] Figure 4 This is a schematic diagram of the top plate of the present invention;

[0022] Figure 5 This is a schematic diagram of the installation of the brush handle of the present invention;

[0023] Figure 6 This is a cross-sectional view of the movable ring of the present invention;

[0024] Figure 7 This is a cross-sectional view of the top plate of the present invention.

[0025] In the diagram: 1. Aquaculture pond; 2. Drainage pipe; 3. Support column; 4. Filter cylinder; 5. Vertical trough; 6. Moving mechanism; 601. Top plate; 602. Mounting plate; 603. Hydraulic cylinder; 604. Movable seat; 605. Motor; 606. Fourth spur gear; 607. Connecting seat; 608. Connecting rod; 609. Movable ring; 610. Connecting ring; 611. Fifth spur gear; 612. Threaded rod; 7. Brushing mechanism; 701. Mounting bracket; 702. Gear rack; 703. First spur gear; 704. Second spur gear; 705. Displacement rod; 706. Brush rod; 707. Sixth spur gear; 708. Square rod; 709. Connecting shaft; 710. Third spur gear; 8. Displacement groove. Detailed Implementation

[0026] 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.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0028] Please see Figures 1 to 7 In this embodiment of the invention, a wastewater recycling treatment device for shrimp farming includes a farming pond 1. A drain pipe 2 is fixedly connected to the bottom of the farming pond 1. A support column 3 is fixedly connected to the bottom of the inner wall of the farming pond 1. A filter cylinder 4 is slidably sleeved on the outer wall of the support column 3. A through hole is opened on the outer wall of the filter cylinder 4. A vertical groove 5 is opened at the bottom of the support column 3. A cavity communicating with the drain pipe 2 is opened at the bottom of the support column 3. The filter cylinder 4 is displaced by a moving mechanism 6. The surface of the filter cylinder 4 is cleaned by a brushing mechanism 7.

[0029] In this embodiment: impurities and shrimp shells in the aquaculture pond 1 slide along the inner wall of the aquaculture pond 1 to the bottom of the aquaculture pond 1. The water in the aquaculture pond 1 continuously passes through the filter cylinder 4 and enters the drain pipe 2 for discharge. Smaller impurities pass through the through holes on the filter cylinder 4 and enter the drain pipe 2 for discharge. Larger impurities and shrimp shells accumulate on the outside of the filter cylinder 4. When discharging large impurities and shrimp shells, the filter cylinder 4 is moved upward by the moving mechanism 6. Larger impurities and shrimp shells in the filter cylinder 4 pass through the vertical groove 5 and enter the drain pipe 2. It is worth noting that the impurities in the aquaculture pond 1 accumulate at the bottom of the aquaculture pond 1, resulting in poor water quality at the bottom of the inner wall of the aquaculture pond 1. Live shrimp usually move around the inner wall of the aquaculture pond 1 where the water quality is better.

[0030] Please refer to this carefully. Figures 2 to 4 The moving mechanism 6 includes a top plate 601, which is fixedly connected to the top of the support column 3. A mounting plate 602 is fixedly connected to one side of the top plate 601. A hydraulic cylinder 603 is mounted on the outer wall of the mounting plate 602. The output end of the hydraulic cylinder 603 is connected to a movable seat 604. A motor 605 is mounted on the top of the movable seat 604. The output end of the motor 605 is connected to a fourth spur gear 606. The moving mechanism 6 also includes a connecting seat 607, which is fixedly connected to the bottom of the top plate 601 and located on one side of the support column 3. The inner wall of the filter cylinder 4 is slidably connected to a connecting rod 608 extending below the connecting seat 607. The bottom end of the connecting rod 608 is fixedly connected to a movable ring 609, which is slidably connected to the outer wall of the support column 3. The top end of the filter cylinder 4 is fixedly connected to a connecting ring 610, which is rotatably connected to the inside of the movable ring 609. The top end of the top plate 601 is located on one side of the fourth spur gear 606 and is rotatably connected to a fifth spur gear 611. The bottom end of the fifth spur gear 611 is fixedly connected to a threaded rod 612, which extends into the inside of the connecting rod 608.

[0031] In this embodiment: when the filter cartridge 4 is moved up and down, the fourth spur gear 606 and the fifth spur gear 611 come into contact, the motor 605 is started, the motor 605 runs and drives the fourth spur gear 606 to rotate, the fourth spur gear 606 rotates and drives the fifth spur gear 611 to rotate, the fifth spur gear 611 rotates and drives the threaded rod 612 to rotate, the threaded rod 612 rotates and drives the connecting rod 608 to move, the connecting rod 608 slides in the connecting seat 607, the displacement of the connecting rod 608 drives the movable ring 609 to move, the movable ring 609 slides on the outer wall of the support column 3, the displacement of the movable ring 609 drives the filter cartridge 4 to move up and down, which facilitates the automatic movement of the filter cartridge 4.

[0032] Please refer to this carefully. Figures 5 to 7 The brushing mechanism 7 includes a mounting bracket 701, which is fixedly connected to the top plate 601 on the side away from the mounting plate 602. A second spur gear 704 is rotatably connected to the top of the mounting bracket 701. A first spur gear 703 is symmetrically fixedly connected to both ends of the second spur gear 704. A gear rack 702 is symmetrically fixedly connected to the outer wall of the movable seat 604, and the gear rack 702 contacts the first spur gear 703. A displacement rod 705 is provided on the outer wall of the second spur gear 704. The displacement rod 705 passes through the top plate 601 and is slidably connected to the top plate 601. A brush rod 706 is fixedly connected to the bottom of the filter cylinder 4. The outer wall of the brush rod 706 is provided with a brush for cleaning the filter cylinder 4. The brushing mechanism 7 also includes a sixth spur gear 707, which is rotatably connected to the top of the top plate 601. A square rod 708 is slidably connected to the inner wall of the sixth spur gear 707. A connecting shaft 709 is fixedly connected to the bottom of the square rod 708. The connecting shaft 709 is rotatably connected to the movable ring 609. A third spur gear 710 is fixedly connected to the bottom of the connecting shaft 709. The third spur gear 710 is in contact with the connecting ring 610.

[0033] In this embodiment: when the through hole on the filter cylinder 4 becomes blocked, affecting the drainage of water from the aquaculture pond 1, the hydraulic cylinder 603 is activated. The operation of the hydraulic cylinder 603 causes the movable seat 604 to move, which in turn causes the fourth spur gear 606 to move and come into contact with the sixth spur gear 707. At the same time, the movement of the movable seat 604 causes the rack 702 to move, which in turn causes the first spur gear 703 to rotate. The rotation of the first spur gear 703 causes the second spur gear 704 to rotate, which in turn causes the displacement rod 705 to move. The displacement of the displacement rod 705 causes the brush rod 706 to move downward, and the brush rod 706 moves downward to contact the outer surface of the filter cylinder 4. Wall contact; start motor 605, motor 605 drives the fourth spur gear 606 to rotate, the fourth spur gear 606 drives the sixth spur gear 707 to rotate, the sixth spur gear 707 drives the square rod 708 to rotate, the square rod 708 drives the third spur gear 710 to rotate, the third spur gear 710 drives the connecting ring 610 to rotate, the connecting ring 610 drives the filter cylinder 4 to rotate, the rotation of the filter cylinder 4 causes the brush rod 706 to move circumferentially relative to the outer wall of the filter cylinder 4, the brush rod 706 brushes and cleans the surface of the filter cylinder 4, avoids the filter cylinder 4 from clogging, and facilitates automatic cleaning of the surface of the filter cylinder 4;

[0034] After cleaning is completed, the hydraulic cylinder 603 operates to drive the movable seat 604 to reposition and reset. The fourth spur gear 606 and the fifth spur gear 611 come into contact. At the same time, the brush rod 706 moves upward and separates from the filter cylinder 4, displacing out of the water surface to prevent impurities from accumulating on the surface of the brush rod 706.

[0035] Please refer to this carefully. Figures 2 to 4 The fourth spur gear 606 meshes with the fifth spur gear 611, and the outer wall of the connecting rod 608 is in contact with the inner wall of the connecting seat 607.

[0036] In this embodiment: the fourth spur gear 606 and the fifth spur gear 611 come into contact, the motor 605 is started, the motor 605 drives the fourth spur gear 606 to rotate, the fourth spur gear 606 rotates and drives the fifth spur gear 611 to rotate, the fifth spur gear 611 rotates and drives the threaded rod 612 to rotate.

[0037] Please refer to this carefully. Figures 2 to 4 The top of the connecting rod 608 is provided with a threaded hole, which matches the threaded rod 612. The inner wall of the movable ring 609 fits against the outer wall of the support column 3.

[0038] In this embodiment: the rotation of the threaded rod 612 causes the connecting rod 608 to move, the connecting rod 608 slides in the connecting seat 607, the displacement of the connecting rod 608 causes the movable ring 609 to move, the movable ring 609 slides on the outer wall of the support column 3, and the displacement of the movable ring 609 causes the filter cylinder 4 to move up and down.

[0039] Please refer to this carefully. Figures 5 to 7 The top end of the rack 702 is provided with a first tooth groove, which meshes with the first spur gear 703.

[0040] In this embodiment: the displacement of the movable seat 604 causes the rack 702 to move, the displacement of the rack 702 causes the first spur gear 703 to rotate, and the rotation of the first spur gear 703 causes the second spur gear 704 to rotate.

[0041] Please refer to this carefully. Figures 5 to 7 The outer wall of the displacement rod 705 is provided with a second tooth groove, which meshes with the second spur gear 704. The top of the top plate 601 is provided with a displacement groove 8 for the displacement rod 705 to slide.

[0042] In this embodiment: the rotation of the second spur gear 704 drives the displacement rod 705 to move, and the displacement of the displacement rod 705 drives the brush rod 706 to move downward, and the brush rod 706 moves downward to contact the outer wall of the filter cylinder 4.

[0043] Please refer to this carefully. Figures 5 to 7 The fourth spur gear 606 meshes with the sixth spur gear 707, and the outer wall of the connecting ring 610 is provided with a third tooth groove, which meshes with the third spur gear 710.

[0044] In this embodiment: the rotation of the fourth spur gear 606 drives the sixth spur gear 707 to rotate, the rotation of the sixth spur gear 707 drives the square rod 708 to rotate, the rotation of the square rod 708 drives the third spur gear 710 to rotate, the rotation of the third spur gear 710 drives the connecting ring 610 to rotate, and the rotation of the connecting ring 610 drives the filter cylinder 4 to rotate.

[0045] Please refer to this carefully. Figures 5 to 7 The outer wall of the sixth spur gear 707 is provided with a square groove, and the inner wall of the square groove is in contact with the outer wall of the square rod 708.

[0046] In this embodiment: when the movable ring 609 moves up and down, it causes the filter cylinder 4 to move up and down, and the movable ring 609 moves, causing the square rod 708 to move, and the square rod 708 slides in the square groove; at the same time, the sixth spur gear 707 rotates, causing the square rod 708 to rotate.

[0047] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A recycling treatment device for shrimp farming wastewater, characterized in that, The system includes a breeding pond (1), with a drain pipe (2) fixedly connected to the bottom of the breeding pond (1). A support column (3) is fixedly connected to the bottom of the inner wall of the breeding pond (1). A filter cylinder (4) is slidably fitted onto the outer wall of the support column (3). A through hole is provided on the outer wall of the filter cylinder (4). A vertical groove (5) is provided at the bottom of the support column (3). A cavity communicating with the drain pipe (2) is provided at the bottom of the support column (3). The filter cylinder (4) is displaced by a moving mechanism (6). The surface of the filter cylinder (4) is brushed. The mechanism (7) performs cleaning. The moving mechanism (6) includes a top plate (601), which is fixedly connected to the top of the support column (3). A mounting plate (602) is fixedly connected to one side of the top plate (601). A hydraulic cylinder (603) is installed on the outer wall of the mounting plate (602). A movable seat (604) is connected to the output end of the hydraulic cylinder (603). A motor (605) is installed on the top of the movable seat (604). A fourth spur gear (606) is connected to the output end of the motor (605).

2. The wastewater recycling treatment equipment for shrimp farming according to claim 1, characterized in that, The moving mechanism (6) also includes a connecting seat (607), which is fixedly connected to the bottom end of the top plate (601) and located on one side of the support column (3). The inner wall of the connecting seat (607) is slidably connected to a connecting rod (608) extending to the bottom of the connecting seat (607). The bottom end of the connecting rod (608) is fixedly connected to a movable ring (609), which is slidably connected to the outer wall of the support column (3). The top end of the filter cylinder (4) is fixedly connected to a connecting ring (610), which is rotatably connected to the inside of the movable ring (609). The top end of the top plate (601) is located on one side of the fourth spur gear (606) and is rotatably connected to a fifth spur gear (611). The bottom end of the fifth spur gear (611) is fixedly connected to a threaded rod (612), which extends into the inside of the connecting rod (608).

3. The wastewater recycling treatment equipment for shrimp farming according to claim 2, characterized in that, The brushing mechanism (7) includes a mounting frame (701), which is fixedly connected to the top plate (601) on the side away from the mounting plate (602). A second spur gear (704) is rotatably connected to the top of the mounting frame (701). A first spur gear (703) is symmetrically fixedly connected to both ends of the second spur gear (704). A rack (702) is symmetrically fixedly connected to the outer wall of the movable seat (604). The rack (702) contacts the first spur gear (703). A displacement rod (705) is provided on the outer wall of the second spur gear (704). The displacement rod (705) passes through the top plate (601) and is slidably connected to the top plate (601). A brush rod (706) is fixedly connected to the bottom end of the displacement rod (705). A brush for cleaning the filter cylinder (4) is provided on the outer wall of the brush rod (706).

4. The wastewater recycling treatment equipment for shrimp farming according to claim 3, characterized in that, The brushing mechanism (7) also includes a sixth spur gear (707), which is rotatably connected to the top of the top plate (601). A square rod (708) is slidably connected to the inner wall of the sixth spur gear (707). A connecting shaft (709) is fixedly connected to the bottom end of the square rod (708). The connecting shaft (709) is rotatably connected to the movable ring (609). A third spur gear (710) is fixedly connected to the bottom end of the connecting shaft (709). The third spur gear (710) is in contact with the connecting ring (610).

5. The wastewater recycling treatment equipment for shrimp farming according to claim 2, characterized in that, The fourth spur gear (606) meshes with the fifth spur gear (611), and the outer wall of the connecting rod (608) is in contact with the inner wall of the connecting seat (607).

6. The wastewater recycling treatment equipment for shrimp farming according to claim 2, characterized in that, The top end of the connecting rod (608) is provided with a threaded hole, which matches the threaded rod (612), and the inner wall of the movable ring (609) is in contact with the outer wall of the support column (3).

7. The wastewater recycling treatment equipment for shrimp farming according to claim 4, characterized in that, The top end of the rack (702) is provided with a first tooth groove, which meshes with the first spur gear (703).

8. The wastewater recycling treatment equipment for shrimp farming according to claim 4, characterized in that, The outer wall of the displacement rod (705) is provided with a second tooth groove, which meshes with the second spur gear (704). The top of the top plate (601) is provided with a displacement groove (8) for the displacement rod (705) to slide.

9. The wastewater recycling treatment equipment for shrimp farming according to claim 4, characterized in that, The fourth spur gear (606) meshes with the sixth spur gear (707), and the outer wall of the connecting ring (610) is provided with a third tooth groove, which meshes with the third spur gear (710).

10. The wastewater recycling treatment equipment for shrimp farming according to claim 4, characterized in that, The outer wall of the sixth spur gear (707) is provided with a square groove, and the inner wall of the square groove is in contact with the outer wall of the square rod (708).

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