PLC (Programmable Logic Controller)-controlled primary filtration and disinfection device for industrial aquaculture

Abstract

The utility model discloses a PLC (programmable logic controller) controlled factory aquaculture primary filtration and disinfection device, and relates to the technical field of factory aquaculture, the PLC controlled factory aquaculture primary filtration and disinfection device comprises a box body I, a box body II and a PLC, the box body I and the box body II are both internally provided with a double-floating-ball water level controller, the installation height of the box body I is 20cm higher than that of the box body II, and the box body I and the box body II are connected through a water pipe; a water inlet of the box body I is formed in the bottom end of the box body I; the device is automatically controlled through the PLC, and is simple in structure, wide in application scene and high in practicability. By means of two-layer primary filtration and ultraviolet disinfection and sterilization of aquaculture water, impurities in water are effectively reduced, generation sources of part of ammonia nitrogen are reduced, the labor intensity of fishpond water changing is reduced, and the problems that in the factory aquaculture process, too many impurities such as bait and fish excrement in circulating water exist, and the water purification efficiency is low are solved; and factory circulating water filtration is easy to block, a water circulation system is troublesome to maintain, and the labor cost is too high.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial aquaculture, in particular to an initial filtration and disinfection device for industrial aquaculture controlled by PLC. Background Art

[0002] In the process of industrial aquaculture, water quality management is one of the cores to achieve efficient aquaculture. The stability of water quality plays a crucial role in the healthy growth of fish. The first step in water purification is to reduce impurities such as fish food and fish feces in the aquaculture water body and reduce the source of ammonia nitrogen generated therefrom.

[0003] At present, most of the existing initial filtration and disinfection devices on the market are either fish toilets with separate sewage discharge or separate water-passing disinfectors. Most of such devices require a lot of manual operation, have a large amount of drainage and make-up water, and consume a lot of energy; the ultraviolet disinfection equipment with a filtering function has a relatively high cost, and there are problems such as low treatment efficiency, cumbersome installation and maintenance, high cost of spare part replacement, and insignificant filtering effect. Therefore, an initial filtration and disinfection device for industrial aquaculture controlled by PLC is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and to propose an initial filtration and disinfection device for industrial aquaculture controlled by PLC.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An initial filtration and disinfection device for industrial aquaculture controlled by PLC, including a first box body, a second box body, and a PLC controller. Double float ball water level controllers are arranged in both the first box body and the second box body. The installation height of the first box body is 20 cm higher than that of the second box body. The first box body and the second box body are connected by a water pipe;

[0007] An inlet of the first box body is arranged at the bottom end of the first box body. A first fixed baffle is welded and fixed at the 1 / 3 position at the bottom right of the first box body. A slot is arranged inside the first box body and above the first fixed baffle. A first filter screen plate is slidably inserted into the interior of the first box body through the slot on the inner side of the first box body; the first filter screen plate can be inserted or pulled out as needed; the width of the slot is 2 mm wider than the thickness of the first filter screen plate to prevent dirt from escaping into the filtered area due to too large a gap between the first filter screen plate and the slot;

[0008] A submersible pump is installed inside the first box body and at the left side position of the first filter screen plate. The upper end of the inlet of the first box body is connected to the inlet of the submersible pump. The lower end of the inlet of the first box body is connected to the aquaculture pond to be initially filtered and disinfected through a connecting water pipe; the optimal lift of the submersible pump is 2.5 - 3.0 meters;

[0009] The double-float water level controller in the first box body, the double-float water level controller in the second box body and the submersible water pump are electrically connected in series; at the same time, the submersible water pump is electrically connected to the PLC controller, and the PLC controller is arranged outside the first box body;

[0010] A first sewage outlet is arranged at the left bottom of the first box body, and a second sewage outlet is arranged at the right bottom of the first box body. The water inlet and the first sewage outlet of the first box body are both arranged at the bottom of the first box body on the left side of the first filter plate, and the second sewage outlet is arranged at the bottom of the first box body on the right side of the first filter plate;

[0011] A first water outlet and a second water outlet are arranged on the right side plate of the first box body. The height of the first water outlet is higher than that of the second water outlet. The first water outlet and the second water outlet are respectively connected to the second box body through water pipes;

[0012] A first water inlet of the second box body and a third water inlet of the second box body are arranged on the left side plate of the second box body. The first water inlet of the second box body is connected to the first water outlet, and the first water outlet is higher than the first water inlet of the second box body. The third water inlet of the second box body is connected to the second water outlet, and the second water outlet and the third water inlet of the second box body are at the same height;

[0013] A second fixed baffle is welded and fixed at the 1 / 3 position at the right bottom of the second box body. The height of the second fixed baffle is the same as that of the first fixed baffle. A slot is arranged inside the second box body and above the second fixed baffle, and the second filter plate is slidably inserted into the slot inside the first box body;

[0014] A third sewage outlet is arranged at the left bottom of the second box body, and a fourth sewage outlet is arranged at the right bottom of the second box body. The third sewage outlet is located on the left side of the second filter plate, and the fourth sewage outlet is located on the right side of the second filter plate;

[0015] The upper and lower positions of the double floats in the double-float water level controllers in the first box body and the second box body are set at the same height. The height of the upper float is the same as the upper edge of the first water outlet, and the height of the lower float is the same as the lower edge of the first water inlet of the second box body;

[0016] A first top plate is welded and fixed on the right side of the top of the second box body, and a second top plate is welded and fixed on the left side of the top of the second box body. A plurality of ultraviolet germicidal lamp fixing holes are arranged above the first top plate and the second top plate. A fully submersible self-sinking ultraviolet germicidal lamp is arranged in each ultraviolet germicidal lamp fixing hole. Each fully submersible self-sinking ultraviolet germicidal lamp is electrically connected to the PCL controller; it can be timed or remotely controlled periodically to turn on and off the ultraviolet germicidal lamp. The fully submersible self-sinking ultraviolet germicidal lamp is simple to install and maintain. The lamp tube is completely submerged in water and can irradiate 360 degrees. The sterilization range is larger than that of the floating ultraviolet germicidal lamp, and the contact time between the water body and the ultraviolet rays is longer and the effect is better;

[0017] A movable baffle is arranged between the first top plate and the second top plate. The right side of the baffle is connected to the first top plate, the left side of the baffle is connected to the second top plate, the rear edge of the baffle is connected to the rear plate of the second box body, and the front edge of the baffle is 10 cm longer than the front plate of the second box body, which is convenient for opening and checking at any time or inserting and removing the filter screen plate for flushing and maintenance. The first top plate and the second top plate arranged above the second box body can effectively isolate the ultraviolet germicidal lamp light from leaking out, so as to avoid harm to the operators and the cultured aquatic products during the sterilization process.

[0018] Both the first sewage outlet and the second sewage outlet are provided with straight-mouth water tank connectors, and a first one-way valve is arranged below the second sewage outlet to prevent the abnormal backflow of the unfiltered water body from mixing with the filtered water body.

[0019] Both the third sewage outlet and the fourth sewage outlet are provided with straight-mouth water tank connectors, and third one-way valves are arranged below both of them to prevent the abnormal backflow of the unfiltered water body from mixing with the filtered water body.

[0020] The bottoms of the first sewage outlet, the second sewage outlet, the third sewage outlet and the fourth sewage outlet are jointly connected to the main sewage pipe, a sewage valve is installed on the main sewage pipe, and a third water outlet is also installed at the bottom of the second box body.

[0021] Further, the height of the first fixed baffle is 10 - 20 cm. The first fixed baffle can enhance the structural strength of the front and rear ends of the box body, enable the first box body to better withstand the internal water pressure and improve safety. At the same time, it can also play a role in sedimentation, and can naturally lead heavier impurities to the bottom of the box through gravity, reducing the filtering pressure on the upper first filter screen plate.

[0022] Further, the first sewage outlet and the second sewage outlet have the same diameter, and the diameters of the first sewage outlet and the second sewage outlet are smaller than the diameter of the water inlet of the first box body. The diameters of both the first sewage outlet and the second sewage outlet are 32 mm or 40 mm.

[0023] The third sewage outlet and the fourth sewage outlet have the same diameter, and the diameters of the third sewage outlet and the fourth sewage outlet are smaller than the diameters of the first water inlet of the second box body and the third water inlet of the second box body.

[0024] Further, the mesh number of the first filter screen plate is 60 mesh, 80 mesh or 100 mesh.

[0025] Further, the mesh number of the second filter screen plate is 150 mesh, 200 mesh or 300 mesh.

[0026] Further, 1 - 2 first vertical reinforcement plates are arranged at the middle position of the first box body and on the left and right sides of the submersible water pump. The front and rear ends of the first vertical reinforcement plates are welded and fixed to the box body. The first vertical reinforcement plates play a role in enhancing the structural strength of the front and rear ends of the first box body, enabling it to better withstand the internal water pressure and improve safety.

[0027] On the inner side of the second box body and to the left of the second filter plate, 1 - 2 second vertical reinforcement plates are provided; the second vertical reinforcement plates enhance the structural strength of the front and rear ends of the second box body, enabling it to better withstand the internal water pressure and improve safety.

[0028] Furthermore, both the first box body and the second box body are made of corrosion - resistant and light - impermeable PP material.

[0029] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0030] The present utility model is automatically controlled by PLC, with a simple structure, wide application scenarios, and strong practicability. Through the primary filtration of the two layers of aquaculture water body and ultraviolet disinfection and sterilization, it effectively reduces the impurities in the water, reduces the generation sources of some ammonia nitrogen, reduces the labor intensity of changing water in the fish pond, and solves the problems of excessive impurities such as fish food and fish feces in the circulating water during industrial aquaculture, low water purification efficiency; easy blockage of industrial circulating water filtration, troublesome maintenance of the water circulation system, and too high labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model.

[0032] Figure 1 is the overall structural schematic diagram of the present utility model;

[0033] Figure 2 is the structural schematic diagram of the first box body of the present utility model;

[0034] Figure 3 is the structural schematic diagram of the second box body of the present utility model;

[0035] Figure 4 From top to bottom in [figure reference] are the connection schematic diagrams of the first water outlet and the first water inlet of the second box body, and the connection schematic diagram of the second water outlet and the second water inlet of the second box body;

[0036] Figure 5 is the water level control flow chart of the first box body and the second box body.

[0037] In the figure: 1. Water inlet of the first box; 2. First sewage outlet; 3. Second sewage outlet; 4. First one-way valve; 5. Rear plate of the box; 6. Double-float water level controller; 7. Left side plate of the box; 8. Right side plate of the box; 9. Front plate of the box; 10. Bottom plate of the box; 11. Vertical reinforcement plate; 12. First filter screen plate; 13. First fixed baffle; 14. First water outlet; 15. Second water outlet; 16. First water inlet of the second box; 17. Second water inlet of the second box; 18. Connecting water pipe; 19. Connecting elbow; 20. Submersible pump; 21. Third water outlet; 22. Fourth sewage outlet; 23. Third sewage outlet; 24. Third one-way valve; 25. Second one-way valve; 26. Second fixed baffle; 27. First top plate; 28. Fixing hole for ultraviolet germicidal lamp; 29. Second top plate; 30. Second fixed baffle; 31. Second filter screen plate; 32. Sewage valve; 33. PLC controller. Detailed implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention;

[0039] Refer to Figures 1-5 , a PLC-controlled factory aquaculture primary filtration and disinfection device, including the first box, the second box, and the PLC controller 33. Double-float water level controllers 6 are arranged inside both the first box and the second box. The installation height of the first box is 20 cm higher than that of the second box. The first box and the second box are connected by a water pipe;

[0040] The first box includes a rear plate 5 of the box, a left side plate 7 of the box, a right side plate 8 of the box, a front plate 9 of the box, and a bottom plate 10 of the box;

[0041] At the bottom end of the first box (i.e., the bottom plate 10 of the box), a water inlet 1 of the first box is provided. A first fixed baffle 13 is welded and fixed at the 1 / 3 position at the bottom right of the first box. A slot is provided inside the first box and above the first fixed baffle 13. The first filter screen plate 12 is slidably inserted into the inside of the first box through the slot on the inner side of the first box; the first filter screen plate 12 can be inserted or pulled out as needed; the width of the slot is 2 mm wider than the thickness of the first filter screen plate 12 to prevent dirt from escaping into the filtered area due to too large a gap between the first filter screen plate 12 and the slot;

[0042] A submersible pump 20 is installed inside the first box and at the left side position of the first filter screen plate 12. The upper end of the water inlet 1 of the first box is connected to the water inlet of the submersible pump 20, and the lower end of the water inlet 1 of the first box is connected to the aquaculture pond that needs primary filtration and disinfection through a connecting water pipe; the best lift of the submersible pump 20 is 2.5 - 3.0 meters;

[0043] The double-float water level controller 6 inside the first box body is electrically connected in series with the double-float water level controller 6 inside the second box body and the submersible pump 20; at the same time, the submersible pump 20 is electrically connected to the PLC controller 33, and the PLC controller 33 is arranged outside the first box body;

[0044] A first sewage outlet 2 is arranged at the left bottom of the first box body, and a second sewage outlet 3 is arranged at the right bottom of the first box body. The water inlet 1 and the first sewage outlet 2 of the first box body are both arranged at the bottom of the first box body on the left side of the first filter plate 12, and the second sewage outlet 3 is arranged at the bottom of the first box body on the right side of the first filter plate 12;

[0045] A first water outlet 14 and a second water outlet 15 are arranged on the right side plate 8 of the first box body. The height of the first water outlet 14 is higher than that of the second water outlet 15. The first water outlet 14 and the second water outlet 15 are respectively connected to the second box body through water pipes;

[0046] A first water inlet 16 of the second box body and a third water inlet 17 of the second box body are arranged on the left side plate of the second box body. The first water inlet 16 of the second box body is connected to the first water outlet 14, and the first water outlet 14 is higher than the first water inlet 16 of the second box body. The third water inlet 17 of the second box body is connected to the second water outlet 15, and the second water outlet 15 and the third water inlet 17 of the second box body are at the same height;

[0047] A second fixed baffle 30 is welded and fixed at the 1 / 3 position at the right bottom of the second box body. The height of the second fixed baffle 30 is the same as that of the first fixed baffle 13. A slot is arranged inside the second box body and above the second fixed baffle 30. The second filter plate 31 is slidably inserted into the slot inside the first box body;

[0048] A third sewage outlet 23 is arranged at the left bottom of the second box body, and a fourth sewage outlet 22 is arranged at the right bottom of the second box body. The third sewage outlet 23 is located on the left side of the second filter plate 31, and the fourth sewage outlet 22 is located on the right side of the second filter plate 31;

[0049] The upper and lower positions of the double floats in the double-float water level controller 6 inside the first box body and the second box body are set at the same height. The height of the upper float is the same as the upper edge of the first water outlet 14, and the height of the lower float is the same as the lower edge of the first water inlet 16 of the second box body;

[0050] On the right side of the top of the second box body, a first top plate 27 is fixedly welded, and on the left side of the top of the second box body, a second top plate 29 is fixedly welded. Above the first top plate 27 and the second top plate 29, a plurality of ultraviolet germicidal lamp fixing holes 28 are provided. A fully submersible self-sinking ultraviolet germicidal lamp is arranged in each ultraviolet germicidal lamp fixing hole 28, and each fully submersible self-sinking ultraviolet germicidal lamp is electrically connected to a PCL controller; it can be timed or remotely controlled periodically to turn on and off the ultraviolet germicidal lamp. The fully submersible self-sinking ultraviolet germicidal lamp is simple to install and maintain. The lamp tube is completely submerged in water and can irradiate 360 degrees. Compared with the floating ultraviolet germicidal lamp, the sterilization range is larger, and the contact time between the water body and the ultraviolet rays is longer, so the effect is better.

[0051] A movable baffle is arranged between the first top plate 27 and the second top plate 29. The right side of the baffle is connected to the first top plate, the left side of the baffle is connected to the second top plate, the rear edge of the baffle is connected to the rear plate of the second box body, and the front edge of the baffle is 10 cm longer than the front plate of the second box body; it is convenient to open and check at any time or insert and pull out the filter mesh plate for flushing and maintenance. The first top plate 27 and the second top plate 29 arranged above the second box body can effectively isolate the ultraviolet germicidal lamp light from leaking out, so as to avoid harm to the operators and the cultured aquatic products during the sterilization process.

[0052] Both the first sewage outlet 2 and the second sewage outlet 3 are provided with straight-mouth water tank connectors. A first one-way valve 4 is arranged below the second sewage outlet 3 to prevent the abnormal backflow of the unfiltered water body from mixing with the filtered water body.

[0053] Both the third sewage outlet 23 and the fourth sewage outlet 22 are provided with straight-mouth water tank connectors, and a third one-way valve 24 is arranged below both of them to prevent the abnormal backflow of the unfiltered water body from mixing with the filtered water body.

[0054] The bottoms of the first sewage outlet 2, the second sewage outlet 3, the third sewage outlet 23 and the fourth sewage outlet 22 are jointly connected to the main sewage pipe. A sewage valve 32 is installed on the main sewage pipe, and a third water outlet 21 is also installed at the bottom of the second box body.

[0055] Furthermore, the height of the first fixed baffle 13 is 10 - 20 cm. The first fixed baffle 13 can enhance the structural strength of the front and rear ends of the box body, enable the first box body to better withstand the internal water pressure and improve safety. At the same time, it can also play a role in sedimentation, and can naturally lead the heavier impurities to the bottom of the box through gravity, reducing the filtering pressure of the upper first filter mesh plate 12.

[0056] Furthermore, the first sewage outlet 2 and the second sewage outlet 3 have the same diameter, and the diameters of the first sewage outlet 2 and the second sewage outlet 3 are smaller than the diameter of the water inlet 1 of the first box body. The diameters of both the first sewage outlet 2 and the second sewage outlet 3 are 32 mm or 40 mm.

[0057] The third sewage outlet 23 and the fourth sewage outlet 22 have the same diameter, and the diameters of the third sewage outlet 23 and the fourth sewage outlet 22 are smaller than the inlet diameters of the first water inlet 16 and the third water inlet 17 of the second box body.

[0058] Further, the mesh number of the first filter plate 12 is 60 mesh, 80 mesh or 100 mesh.

[0059] Further, the mesh number of the second filter plate 31 is 150 mesh, 200 mesh or 300 mesh.

[0060] Further, 1-2 first vertical reinforcement plates 11 are arranged at the middle position of the first box body and on the left and right sides of the submersible pump 20. The front and rear ends of the first vertical reinforcement plate 11 are fixedly welded to the box body. The first vertical reinforcement plate 11 enhances the structural strength of the front and rear ends of the first box body, making it more capable of withstanding the internal water pressure and improving safety;

[0061] 1-2 second vertical reinforcement plates 26 are arranged inside the second box body and on the left side of the second filter plate 31; the second vertical reinforcement plate 26 enhances the structural strength of the front and rear ends of the second box body, making it more capable of withstanding the internal water pressure and improving safety.

[0062] Further, both the first box body and the second box body are made of corrosion-resistant and light-impermeable PP material.

[0063] During use, first, more than 10 cm of water can be injected into the first box body through an external water pump, and then the switch of the submersible pump 20 is turned on through the PLC controller 33. When the water pumped by the submersible pump 20 flows in normally, the ultraviolet germicidal lamp is turned on through the PLC controller 33; after the water pumped into the first box body flows into the first box body, some heavier impurities naturally settle to the bottom of the box under the action of gravity. After the water body flows through the first filter 12, the first water body filtration is carried out;

[0064] When the water depth accumulates to more than 10 cm, under the action of the water pressure difference, the water body in the first box body flows horizontally into the first water inlet 16 of the second box body through the first water outlet 14 for the first ultraviolet germicidal lamp sterilization and the second water body filtration. After the water body passes through the second filtration, the second ultraviolet germicidal lamp sterilization is carried out, and then it flows out downward by natural gravity through the third water outlet 21 of the second box body. The diameter of the third water outlet 21 of the second box body is 75 mm and flows back to the aquaculture pond.

[0065] After being used for a period of time, the water level in the first box rises. When the water level in the first box rises to the first water outlet 14, the first water outlet 14 is higher than the first water inlet 16 of the second box. Under the action of gravity, water will naturally flow into the second box. At this time, the filtered water body in the first box flows into the second box through both the first water outlet 14 and the second water outlet 15. The second box is provided with a drainage port with a diameter smaller than that of the water inlet, which can slow down the outflow speed of the water body in the second box, and at the same time increase the contact time between the ultraviolet germicidal lamp and the water body, improving the sterilization effect.

[0066] When the water level in the first box or the second box rises to the height of the floating ball (high position) of the double-floating-ball water level controller 6, the submersible pump 20 is automatically turned off. The water in the first box and the second box flows out under the action of gravity, and the water level in the box drops. When the double-floating-ball water level controllers of both the first box and the second box reach the height of the lower floating ball (low position), the submersible pump 20 is automatically turned on. The water level control process is as Figure 5 shown.

[0067] After being used for a period of time, when there is a lot of dirt deposition in the first box and the second box, the ultraviolet germicidal lamp and the submersible pump 20 are turned off through the PLC controller 33. When the water body in the first box and the second box is reduced to less than half, the sewage discharge valve 32 is opened to discharge the dirt in the first box and the second box. At this time, the first filter plate 12 and the second filter plate 31 can be pulled out for backwashing or replacement of the filter screen.

Claims

1. An initial filtration and disinfection device for industrial aquaculture controlled by a PLC, comprising a first box body, a second box body, and a PLC controller (33), characterized in that, A double-float water level controller (6) is installed in both the first box body and the second box body. The installation height of the first box body is 20 cm higher than that of the second box body. The first box body and the second box body are connected by a water pipe. An inlet (1) of the first box body is provided at the bottom end of the first box body. A first fixed baffle (13) is welded and fixed at the 1 / 3 position at the bottom right of the first box body. A slot is provided inside the first box body and above the first fixed baffle (13). A first filter screen plate (12) is slidably inserted into the first box body through the slot inside the first box body. A submersible pump (20) is installed inside the first box body and at the left position of the first filter screen plate (12). The upper end of the inlet (1) of the first box body is connected to the inlet of the submersible pump (20). The lower end of the inlet (1) of the first box body is connected to the aquaculture pond that needs to be initially filtered and disinfected through a connecting water pipe. The double-float water level controller (6) inside the first box body, the double-float water level controller (6) inside the second box body, and the submersible pump (20) are electrically connected in series; at the same time, the submersible pump (20) is electrically connected to a PLC controller (33), and the PLC controller (33) is arranged outside the first box body. A first sewage outlet (2) is provided at the left bottom of the first box body, and a second sewage outlet (3) is provided at the right bottom of the first box body. The inlet (1) of the first box body and the first sewage outlet (2) are both provided at the bottom of the first box body on the left side of the first filter screen plate (12), and the second sewage outlet (3) is provided at the bottom of the first box body on the right side of the first filter screen plate (12). A first water outlet (14) and a second water outlet (15) are provided on the right side plate (8) of the first box body. The height of the first water outlet (14) is higher than that of the second water outlet (15). The first water outlet (14) and the second water outlet (15) are respectively connected to the second box body through water pipes. A first inlet (16) and a third inlet (17) of the second box body are provided on the left side plate of the second box body. The first inlet (16) of the second box body is connected to the first water outlet (14), and the first water outlet (14) is higher than the first inlet (16) of the second box body. The third inlet (17) of the second box body is connected to the second water outlet (15), and the second water outlet (15) and the third inlet (17) of the second box body are at the same height. A second fixed baffle (30) is welded and fixed at the 1 / 3 position at the bottom right of the second box body. The height of the second fixed baffle (30) is the same as that of the first fixed baffle (13). A slot is provided inside the second box body and above the second fixed baffle (30). A second filter screen plate (31) is slidably inserted into the slot inside the first box body. A third sewage outlet (23) is provided at the left bottom of the second box body, and a fourth sewage outlet (22) is provided at the right bottom of the second box body. The third sewage outlet (23) is located on the left side of the second filter screen plate (31), and the fourth sewage outlet (22) is located on the right side of the second filter screen plate (31). The upper and lower positions of the double float balls in the double float ball water level controller (6) inside the first box body and the second box body are set at the same height. The height of the upper float ball is the same as the upper edge of the first water outlet (14), and the height of the lower float ball is the same as the lower edge of the first water inlet (16) of the second box body. A first top plate (27) is welded and fixed to the right side of the top of the second box body, and a second top plate (29) is welded and fixed to the left side of the top of the second box body. A plurality of ultraviolet germicidal lamp fixing holes (28) are provided above both the first top plate (27) and the second top plate (29). A fully submersible self - sinking ultraviolet germicidal lamp is provided in each ultraviolet germicidal lamp fixing hole (28), and each fully submersible self - sinking ultraviolet germicidal lamp is electrically connected to a PCL controller. A movable baffle is arranged between the first top plate (27) and the second top plate (29). The right side of the baffle is connected to the first top plate, the left side of the baffle is connected to the second top plate, the rear edge of the baffle is connected to the rear plate of the second box body, and the front edge of the baffle is 10 cm longer than the front plate of the second box body. Both the first sewage outlet (2) and the second sewage outlet (3) are provided with straight - mouth water tank connectors, and a first one - way valve (4) is arranged below the second sewage outlet (3). Both the third sewage outlet (23) and the fourth sewage outlet (22) are provided with straight - mouth water tank connectors, and third one - way valves (24) are arranged below both of them. The bottoms of the first sewage outlet (2), the second sewage outlet (3), the third sewage outlet (23) and the fourth sewage outlet (22) are jointly connected to a main sewage pipe, a sewage valve (32) is installed on the main sewage pipe, and a third water outlet (21) is also installed at the bottom of the second box body.

2. The primary filtration and disinfection device for industrial aquaculture controlled by PLC according to claim 1, characterized in that, The height of the first fixed baffle (13) is 10 - 20 cm.

3. A primary filtration and disinfection device for industrial aquaculture controlled by PLC according to claim 1, characterized in that, The first sewage outlet (2) and the second sewage outlet (3) have the same diameter, and the diameters of the first sewage outlet (2) and the second sewage outlet (3) are smaller than the diameter of the water inlet of the first water inlet (1) of the first box body. The diameters of both the first sewage outlet (2) and the second sewage outlet (3) are 32 mm or 40 mm. The third sewage outlet (23) and the fourth sewage outlet (22) have the same diameter, and the diameters of the third sewage outlet (23) and the fourth sewage outlet (22) are smaller than the water inlet diameters of the first water inlet (16) and the third water inlet (17) of the second box body.

4. A primary filtration and disinfection device for industrial aquaculture controlled by PLC according to claim 1, characterized in that, The mesh number of the first filter plate (12) is 60 mesh, 80 mesh or 100 mesh.

5. The primary filtration and disinfection device for industrial aquaculture controlled by PLC according to claim 1, wherein, The mesh number of the second filter plate (31) is 150 mesh, 200 mesh or 300 mesh.

6. The primary filtration and disinfection device for industrial aquaculture controlled by PLC according to claim 1, characterized in that, One or two first vertical reinforcement plates (11) are arranged at the middle position of the first box body and on the left and right sides of the submersible water pump (20). The front and rear ends of the first vertical reinforcement plate (11) are welded and fixed to the box body. One or two second vertical reinforcement plates (26) are arranged inside the second box body and on the left side of the second filter plate (31).

7. The primary filtration and disinfection device for industrial aquaculture controlled by PLC according to claim 1, wherein Both the first box body and the second box body are made of corrosion - resistant and light - impermeable PP material.

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