Working method for automatically cleaning and filtering fish breeding tail water

Abstract

The invention discloses an automatic cleaning and filtering working method for breeding tail water. The automatic cleaning and filtering working method comprises the following steps: S0, a filtering state; s1, determining the relationship between the liquid level difference between the two liquid level transmitters and a set value; s2, a scrubbing state; s3, the relation between the liquid level difference between the two liquid level transmitters and 0 is determined; s4, determining a pollution discharge state; s5, the relation between the liquid level difference between the two liquid level transmitters and 0 is determined, and whether the two liquid level transmitters are in a low liquid level value or not is determined; s6, restarting the filtering state; the filtering effect and reliability of the floating objects in the breeding tail water are remarkably improved, and standardized construction and standardized management of a breeding tail water treatment project are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture tail water treatment, and particularly to an automatic cleaning and filtering working method for aquaculture tail water. Background Art

[0002] Whether it is industrialized fish farming or large pond aquaculture, there are a large amount of suspended fish feces and bait in the aquaculture tail water, which causes great environmental pollution and large water consumption. The recycling of the treated water is an urgent problem to be solved at present. The current general technology for treating aquaculture tail water in China - the "three ponds and two dams" process treatment technology. The suspended matter in the aquaculture tail water is intercepted and filtered through the filter dams (the structure of the filter dam is as Figure 10 shown, that is, a filter structure as shown is built on the isolation dam with perforated bricks, and filter media are arranged in the filter structure). The filter media of the filter dam usually adopt porous materials such as volcanic stones and ceramsites. The main problems are: the filtration accuracy is not enough, it is easy to be blocked, and it is difficult to clean. Cleaning the filter media is time-consuming and labor-intensive, with a large labor intensity, and mechanized and automated operations cannot be achieved, causing difficulties in treating the tail water in the aquaculture industry. There is an urgent need for a filtering device with high filtration accuracy, capable of automatic cleaning operation, reliable performance, and simple use and maintenance. Summary of the Invention

[0003] The present invention aims to at least solve the technical problems existing in the prior art, and particularly innovatively proposes an automatic cleaning and filtering working method for aquaculture tail water, which can realize the automatic cleaning and sewage discharge after filtering the aquaculture tail water.

[0004] To achieve the above object of the present invention, the present invention provides an automatic cleaning and filtering working method for aquaculture tail water, including the following steps:

[0005] S0, filtering state; the filtering state is: the first gate and the second gate are in the open state, the plugging component is in the closed state, and the brush component returns to the upper position state;

[0006] S1, determining the relationship between the liquid level difference between the two liquid level transmitters and the set value:

[0007] If the liquid level difference between the two liquid level transmitters is less than the set value, step S0 is executed;

[0008] If the liquid level difference between the two liquid level transmitters is greater than or equal to the set value, the next step is executed;

[0009] S2, brushing state; the brushing state is: the second gate is first in the closed state, and then the brush component reciprocates up and down; at this time, the first gate is in the open state, the second gate is in the closed state, the plugging component is in the closed state, and the brush component reciprocates up and down;

[0010] S3. Determine the relationship between the liquid level difference between the two liquid level transmitters and 0:

[0011] If the liquid level difference between the two liquid level transmitters is approximately equal to 0, then proceed to the next step;

[0012] If the liquid level difference between the two liquid level transmitters is approximately not equal to 0, then the brush assembly continues to move up and down reciprocally, and step S3 is executed;

[0013] S4. Sewage discharge state; The sewage discharge state is: The brush assembly first stops moving up and down reciprocally and stops at the upper position, then the first gate is closed, and the plug assembly is opened. At this time, the brush assembly stops moving up and down reciprocally and stops at the upper position, the first gate and the second gate are in the closed state, and the plug assembly is in the open state;

[0014] S5. Determine the relationship between the liquid level difference between the two liquid level transmitters and 0, and whether it is at the low liquid level value:

[0015] If the liquid level difference between the two liquid level transmitters is approximately equal to 0 and it is at the low liquid level value, then proceed to the next step;

[0016] Otherwise, continue with sewage discharge and execute step S5;

[0017] S6. Restart the filtration state; The restarted filtration state is: The plug assembly is in the closed state, and the first gate and the second gate are in the open state; At this time, the brush assembly stops at the upper position, the plug assembly is in the closed state, and the first gate and the second gate are in the open state; Return to step S0.

[0018] In a preferred embodiment of the present invention, the control method for the second gate to change from the open state to the closed state in step S2 is:

[0019] The PLC controller sends a control signal to the second gate cylinder, and this control signal is a control signal to open the second gate. After the second gate cylinder receives the control signal sent by the PLC controller, the second gate cylinder controls the second gate to open.

[0020] In a preferred embodiment of the present invention, the control method for the brush assembly to move up and down reciprocally in step S2 is:

[0021] S21. The PLC controller sends a control signal to the laser emitter, and this control signal is to control the laser emitter to emit laser. After the laser emitter receives the control signal sent by the PLC controller, the laser emitter emits laser every t ns;

[0022] S22. The PLC controller sends a control signal to the brush cylinder, and this control signal is to control the telescopic rod of the brush cylinder to extend. After the brush cylinder receives the control signal sent by the PLC controller, the telescopic rod of the brush cylinder extends;

[0023] S23. The PLC controller obtains the moment when the laser receiver collects the laser, and determines the downward movement distance of the brush based on the moment when the laser receiver collects the laser and the moment when the laser emitter emits the laser:

[0024] d = d0 - c[t n -(t0 + nt)],

[0025] where d is the downward movement distance of the brush;

[0026] d0 is the height value between the crossbeam and the box body when the brush stops at the upper position;

[0027] c is the speed value of the laser;

[0028] t n is the moment when the laser receiver receives the laser for the nth time;

[0029] t0 is the moment when the laser emitter initially emits the laser;

[0030] n is the number of times the laser emitter emits the laser;

[0031] t is the interval between the laser emitter's laser emissions;

[0032] S24. Judge the relationship between d and d max :

[0033] If d = d max , then the PLC controller sends a control signal to the brush cylinder, and this control signal is to control the shortening of the telescopic rod of the brush cylinder. After the brush cylinder receives the control signal sent by the PLC controller, the telescopic rod of the brush cylinder shortens; proceed to the next step;

[0034] If d > d max , then the telescopic rod of the brush cylinder continues to extend; execute step S24; d max is the preset maximum downward distance;

[0035] S25. Determine the distance between the crossbeam and the box body based on the moment when the laser receiver collects the laser and the moment when the laser emitter emits the laser:

[0036] d' = c[t n -(t0 + nt)],

[0037] where d' is the height value between the crossbeam and the box body;

[0038] c is the speed value of the laser;

[0039] t n is the moment when the laser receiver receives the laser for the nth time;

[0040] t0 is the moment when the laser emitter initially emits the laser;

[0041] n is the number of times the laser emitter emits laser;

[0042] t is the interval between laser emissions by the laser emitter;

[0043] S26, determine the relationship between d and d0:

[0044] If d < d0, the telescopic rod of the brush cylinder continues to shorten;

[0045] If d = d0, execute step S22; until the brush assembly stops reciprocating up and down and stops at the upper position.

[0046] In a preferred embodiment of the present invention, the control method for the plugging component to change from the open state to the closed state in step S6 is as follows:

[0047] The PLC controller sends a control signal to the plugging control cylinder, and this control signal is a signal for controlling the closing of the plugging body. After the plugging control cylinder receives the control signal sent by the PLC controller, the plugging control cylinder controls the plugging body to close the sewage outlet;

[0048] The PLC controller obtains the pressure value of the plugging body on the pressure sensor collected by the pressure sensor, and judges the relationship between P and P0:

[0049] If P ≥ P0, the plugging component is in the closed state; the plugging control cylinder stops working;

[0050] If P < P0, the telescopic rod of the plugging control cylinder continues to extend until P ≥ P0, where P is the pressure value collected by the pressure sensor and P0 is the preset pressure threshold.

[0051] The present invention also discloses a computer system, including:

[0052] A processor;

[0053] A memory for storing instructions executable by the processor;

[0054] Wherein, the processor is configured to implement the automatic cleaning and filtering working method of the aquaculture tail water when executing the executable instructions.

[0055] The present invention also discloses a computer-readable storage medium, including:

[0056] A memory, on which a computer program is stored;

[0057] A processor, configured to execute the program in the memory to implement the automatic cleaning and filtering working method of the aquaculture tail water.

[0058] The present invention also discloses an automatic cleaning and filtering device for aquaculture tail water, which comprises a box body. An inlet weir is arranged on one side of the box body, and an outlet structure is arranged on the side opposite to the inlet weir. A first gate and a second gate are respectively arranged in the box body near the inlet side and the outlet side. At least three filtering chambers are separated in the box body between the first gate and the second gate by a partition board. A filter screen is arranged at the middle and lower part of the partition board between adjacent filtering chambers, and the tail water enters the next filtering chamber through the filter screen. Brush assemblies for brushing the filter screen are arranged on both sides of each filter screen, and the brush assemblies can automatically move up and down along the filter screen. The up and down movement distance of the brush assemblies is measured by a laser assembly. A sewage outlet is arranged at the bottom surface of each filtering chamber, and a plugging head assembly capable of automatically opening is equipped on each sewage outlet. The sewage outlet is connected to a sewage pipe.

[0059] In a preferred embodiment of the present invention, the first gate and the second gate are respectively controlled to open and close by cylinders installed on the top surface of the box body, so that the gates can be automatically opened and closed by the cylinders.

[0060] In a preferred embodiment of the present invention, the brush assembly comprises a brush mounting bracket. The brush bracket comprises a cross beam, and vertical mounting frames are respectively arranged on both sides of the cross beam facing the filter screen. The vertical mounting frames penetrate through the top plate of the box body and extend into the box body. Brushes are respectively installed on the vertical mounting frames. Both sides of each filter screen are in contact with the corresponding brushes. The brush bracket is controlled by a brush cylinder to move up and down along the filter screen. When the pollutants on the filter screen increase, affecting the filtration and causing the water level in the rear filtering chamber to drop, the brush cylinder is controlled to move up and down along the filter screen to clean the sundries on the filter screen.

[0061] In a preferred embodiment of the present invention, the plugging head assembly comprises a plugging head body matching the sewage outlet. A vertical rod is connected to the plugging head body, and the vertical rod penetrates through the top surface of the box body and is connected to a plugging head control cylinder, so as to realize the automatic opening and closing of the plugging head.

[0062] In a preferred embodiment of the present invention, all the vertical rods are connected to a transverse frame, and the transverse frame is connected to the plugging head control cylinder.

[0063] In a preferred embodiment of the present invention, a spring cover is arranged on the top surface of the box body corresponding to the vertical rod. The top end of the vertical rod penetrates through the spring cover, and a spring is sleeved on the vertical rod located inside the spring cover. The top end of the spring is in contact with the top surface of the spring cover. A baffle with a diameter larger than that of the vertical rod is arranged at the position corresponding to the lower end of the spring on the vertical rod.

[0064] In a preferred embodiment of the present invention, four filter chambers are partitioned in the box body, and liquid level transmitters are installed in the first and third filter chambers. The liquid level conditions of the front and rear filter chambers are provided by the liquid level transmitters, so as to realize automatic control of cleaning or filtering.

[0065] In summary, due to the adoption of the above technical solutions, the present invention has a simple structure, is easy to use and maintain, can realize the control of the working state of the device through the PLC program control terminal, realize the automatic cleaning and automatic filtering operation of the filtering device, greatly reduce the management and protection cost, and significantly improve the filtering effect and reliability of the floating substances in the aquaculture tail water. It can be produced in a factory, realize the standardization of equipment, and is conducive to the standardized construction and management of the aquaculture tail water treatment project.

[0066] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The above and / or additional aspects and advantages of the present invention will become apparent and understandable from the description of the embodiments in conjunction with the following drawings, wherein:

[0068] Figure 1 is the top view of the present invention.

[0069] Figure 2 is Figure 1 the A-A cross-sectional view of

[0070] Figure 3 is Figure 1 the B-B cross-sectional view of

[0071] Figure 4 is Figure 2 the C-C cross-sectional view of

[0072] Figure 5 is Figure 2 the D-D cross-sectional view of

[0073] Figure 6 is Figure 2 the A-direction view of

[0074] Figure 7 is the installation drawing of the device.

[0075] Figure 8 is Figure 7 the E-E cross-sectional view of

[0076] Figure 9 is the schematic diagram of the installation of the sewage pipe.

[0077] Figure 10 is the schematic diagram of the structure of the existing filter dam.

[0078] Figure 11 It is a schematic block diagram for process connection. Specific implementation manners

[0079] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0080] The present invention discloses an automatic cleaning and filtering working method for aquaculture tail water, as Figure 11 shown, including the following steps:

[0081] S0, filtering state; the filtering state is: the first gate and the second gate are in the open state, the plugging component is in the closed state, and the brush component returns to the upper position state;

[0082] S1, determining the relationship between the liquid level difference between two liquid level transmitters and the set value:

[0083] If the liquid level difference between the two liquid level transmitters is less than the set value, step S0 is executed;

[0084] If the liquid level difference between the two liquid level transmitters is greater than or equal to the set value, the next step is executed;

[0085] S2, brushing state; the brushing state is: the second gate is first in the closed state, and then the brush component reciprocates up and down; at this time, the first gate is in the open state, the second gate is in the closed state, the plugging component is in the closed state, and the brush component reciprocates up and down;

[0086] S3, determining the relationship between the liquid level difference between two liquid level transmitters and 0:

[0087] If the liquid level difference between the two liquid level transmitters is approximately equal to 0, the next step is executed;

[0088] If the liquid level difference between the two liquid level transmitters is approximately not equal to 0, the brush component continues to reciprocate up and down, and step S3 is executed;

[0089] S4, sewage discharge state; the sewage discharge state is: the brush component first stops reciprocating up and down and stops at the upper position, the first gate is then closed, and the plugging component is then opened. At this time, the brush component stops reciprocating up and down and stops at the upper position, the first gate and the second gate are in the closed state, and the plugging component is in the open state;

[0090] S5, determining the relationship between the liquid level difference between two liquid level transmitters and 0, and whether it is at a low liquid level value:

[0091] If the liquid level difference between the two liquid level transmitters is approximately equal to 0 and at the low liquid level value, then proceed to the next step;

[0092] Otherwise, continue with the sewage discharge and execute step S5;

[0093] S6. Restart the filtration state; the restarted filtration state is: the plugging component is in the closed state, the first gate and the second gate are in the open state; make the liquid level at the high liquid level; at this time, the brush component stops in the upper position state, the plugging component is in the closed state, and the first gate and the second gate are in the open state; return to step S0. In order to brush the filter screen, steps S2 - S4 can be executed multiple times.

[0094] In a preferred embodiment of the present invention, the control method for the second gate to change from the open state to the closed state in step S2 is:

[0095] The PLC controller sends a control signal to the second gate cylinder, and this control signal is a control signal for opening the second gate. After the second gate cylinder receives the control signal sent by the PLC controller, the second gate cylinder controls the second gate to open.

[0096] In a preferred embodiment of the present invention, the control method for the brush component to reciprocate up and down in step S2 is:

[0097] S21. The PLC controller sends a control signal to the laser emitter, and this control signal is for controlling the laser emitter to emit laser. After the laser emitter receives the control signal sent by the PLC controller, the laser emitter emits laser every t ns;

[0098] S22. The PLC controller sends a control signal to the brush cylinder, and this control signal is for controlling the telescopic rod of the brush cylinder to extend. After the brush cylinder receives the control signal sent by the PLC controller, the telescopic rod of the brush cylinder extends;

[0099] S23. The PLC controller obtains the moment when the laser receiver collects the laser, and determines the downward movement distance of the brush based on the moment when the laser receiver collects the laser and the moment when the laser emitter emits the laser:

[0100] d = d0 - c[t n -(t0 + nt)],

[0101] where d is the downward movement distance of the brush;

[0102] d0 is the height value between the crossbeam and the box body when the brush stops in the upper position;

[0103] c is the speed value of the laser;

[0104] t n is the moment when the laser receiver receives the laser for the nth time;

[0105] t0 is the moment when the laser emitter initially emits laser light;

[0106] n is the number of times the laser emitter emits laser light;

[0107] t is the interval between laser emissions by the laser emitter;

[0108] S24, determine the relationship between d and d max :

[0109] If d = d max , the PLC controller sends a control signal to the brush cylinder, and this control signal is to control the shortening of the telescopic rod of the brush cylinder. After the brush cylinder receives the control signal sent by the PLC controller, the telescopic rod of the brush cylinder shortens; perform the next step;

[0110] If d > d max , the telescopic rod of the brush cylinder continues to extend; perform step S24; d max is the preset maximum downward distance;

[0111] S25, determine the distance between the crossbeam and the box body by the moment when the laser receiver collects the laser and the moment when the laser emitter emits the laser:

[0112] d′ = c[t n -(t0 + nt)],

[0113] where d′ is the height value between the crossbeam and the box body;

[0114] c is the speed value of the laser;

[0115] t n is the moment when the laser receiver receives the laser for the nth time;

[0116] t0 is the moment when the laser emitter initially emits laser light;

[0117] n is the number of times the laser emitter emits laser light;

[0118] t is the interval between laser emissions by the laser emitter;

[0119] S26, determine the relationship between d and d0:

[0120] If d < d0, the telescopic rod of the brush cylinder continues to shorten;

[0121] If d = d0, perform step S22; until the brush assembly stops reciprocating up and down and stops at the upper position.

[0122] In a preferred embodiment of the present invention, the control method for the plugging component to change from the open state to the closed state in step S6 is:

[0123] The PLC controller sends a control signal to the plug control cylinder, and this control signal is a signal for controlling the closure of the plug body. After the plug control cylinder receives the control signal sent by the PLC controller, the plug control cylinder controls the plug body to close the sewage outlet;

[0124] The PLC controller obtains the pressure value of the plug body on the pressure sensor collected by the pressure sensor, and judges the relationship between P and P0:

[0125] If P≥P0, the plug assembly is in the closed state; the plug control cylinder stops working;

[0126] If P<P0, the telescopic rod of the plug control cylinder continues to extend until P≥P0. Here, P is the pressure value collected by the pressure sensor, and P0 is the preset pressure threshold.

[0127] The present invention also discloses a computer system, including:

[0128] A processor;

[0129] A memory for storing instructions executable by the processor;

[0130] Wherein, when the processor is configured to execute the executable instructions, it implements the automatic cleaning and filtering working method of the aquaculture tail water.

[0131] The present invention also discloses a computer-readable storage medium, including:

[0132] A memory, on which a computer program is stored;

[0133] A processor, for executing the program in the memory to implement the automatic cleaning and filtering working method of the aquaculture tail water.

[0134] The present invention also discloses an automatic cleaning and filtering device for aquaculture tail water, as Figures 1 to 6 shown, including a box body 1. An inlet weir 101 is arranged on one side of the box body 1, and an outlet structure is arranged on the side opposite to the inlet weir 101. The outlet structure can also be an outlet weir.

[0135] Inside the box body 1, a first gate 2 and a second gate 3 are respectively arranged near the water inlet side and the water outlet side. At least three filter chambers are separated in the box body 1 between the first gate 2 and the second gate 3 by a partition board. In the figure, there are four filter chambers. Level transmitters 9 are installed in the first and third filter chambers, namely the first level transmitter and the second level transmitter respectively. The level data terminal of the first level transmitter is connected to the first level data terminal of the PLC controller, and the level data terminal of the second level transmitter is connected to the second level data terminal of the PLC controller. The first gate 2 and the second gate 3 are respectively controlled to open and close by cylinders 6 installed on the top surface of the pool body (the cylinder corresponding to the first gate 2 is called the first gate cylinder, and the cylinder corresponding to the second gate 3 is called the second gate cylinder. At this time, the control end of the first gate cylinder is connected to the first gate cylinder control end of the PLC controller, and the control end of the second gate cylinder is connected to the second gate cylinder control end of the PLC controller). As shown in the figure, the cylinder 6 is installed on the top surface of the box body through a cylinder mounting bracket. The top surface of the box body is provided with perforations for the first gate and the second gate to pass through.

[0136] In the middle and lower part of the partition board between adjacent filter chambers, a filter net 4 is arranged. The tail water enters the next filter chamber through the filter net 4. On both sides of each filter net 4, there is a brush assembly for brushing the filter net, which can automatically move up and down along the filter net 4. The bottom surface of each filter chamber is provided with a sewage outlet, and each sewage outlet is equipped with a plug assembly that can automatically open. The sewage outlet is connected to a sewage pipe 5.

[0137] The brush assembly includes a brush mounting bracket 7. The brush bracket includes a cross beam 701. On the lower side of the cross beam 701, vertical mounting brackets 702 are respectively provided on both sides of the filter screen. The lower ends of the vertical mounting brackets 702 pass through the top plate of the pool body and extend into the pool body 1. Brushes 703 are respectively mounted on the vertical mounting brackets at the lower ends corresponding to the filter screen. Both sides of each filter screen are in contact with the corresponding brushes 703. Among them, on both sides of the vertical mounting bracket 702 located between the two filter screens, brushes are provided corresponding to the filter screens on both sides. That is to say, brushes are provided on both sides of the middle vertical mounting bracket 702. The brush bracket is controlled by a brush cylinder 704 to move up and down along the filter screen. The control end of the brush cylinder 704 is connected to the brush cylinder control end of the PLC controller. When the brush assembly is not working, the brush assembly is located above the filter screen (upper position). Specifically, the brush cylinder 704 is connected to the cross beam 701, and the brush cylinder 704 controls all the brushes to move up and down simultaneously. The brush cylinder 704 is mounted on the top surface of the box body through a cylinder bracket. A laser receiver is provided at the lower end of the cross beam 701, and a laser emitter is provided on the outer top surface of the box body 1; or a laser emitter is provided at the lower end of the cross beam 701, and a laser receiver is provided on the outer top surface of the box body 1; the vertical laser emitted by the laser emitter is exactly received by the laser receiver, which is used to judge the stroke of the brush brushing the filter screen up and down; the laser emitter and the laser receiver constitute a laser assembly; the laser emission control end of the laser emitter is connected to the laser control end of the PLC controller, and the data end of the laser receiver is connected to the data end of the PLC controller.

[0138] The plugging component includes a plugging body 8 that matches the sewage outlet. A vertical rod 801 is connected to the plugging body 8. The vertical rod 801 passes through the top surface of the box body and is connected to a plugging control cylinder 802. The sewage outlet is normally closed. When sewage discharge is required, the plugging component moves the plugging body 8 upward, and the sewage outlet is opened. Preferably, a pressure sensor is provided at the sewage outlet to sense whether the plugging body 8 closes the sewage outlet; the data end of the pressure sensor is connected to the pressure data end of the PLC controller. Two cylinder magnetic position sensors can also be respectively provided on each plugging control cylinder, gate cylinder (first gate cylinder, second gate cylinder), and brush cylinder to realize the perception of the upper and lower limit positions.

[0139] Preferably: The tops of all the vertical rods 801 are connected to a cross frame 806, and the cross frame 806 is connected to the plugging control cylinder 802. Spring covers 803 are provided on the top surface of the box body corresponding to the vertical rods. The tops of all the vertical rods pass through the spring covers. Springs 804 are sleeved on the vertical rods located inside the spring covers. The top of the spring 804 is in contact with the top surface of the spring cover 803. A baffle 805 with a diameter larger than that of the vertical rod is provided at the position corresponding to the lower end of the spring on the vertical rod. When the plugging moves upward, the baffle 805 compresses the spring. After the sewage discharge is completed, the spring assists the plugging to return to its position, and at the same time helps to ensure that the plugging keeps the sewage outlet normally closed.

[0140] When set for industrial aquaculture, a sedimentation tank is arranged at the front side of the box body. The sedimentation tank is connected to this filtering device through a water inlet weir 101. The water in the sedimentation tank enters the box body. After being filtered and exiting the box body, it then enters subsequent aeration tanks, etc.

[0141] When used for large pond aquaculture, based on the original three-pond and two-dam process, through transformation, such as Figures 7 to 9 , our filtering device can be installed on the dam 10 between the sedimentation tank, the aeration tank, and the ecological purification tank. The sewage discharge pipe 5 is located inside the dam 10 and penetrates out of the dam 10. When the sedimentation tank, the aeration tank, and the ecological purification tank are large or the water treatment volume is large, multiple such filtering devices can be installed on the dam. The water coming out of the water outlet structure of the filtering device enters the subsequent aeration tank or ecological purification tank, replacing the filtering structure on the original filtering dam.

[0142] During actual operation, the liquid level transmitter detects the liquid levels in the first filtering chamber and the third filtering chamber in real time. After comparison, when the liquid level difference of the liquid level transmitter < the set value, the first gate and the second gate open, the plug component closes, and the brush component returns to the upper position. The filtering device enters the normal filtering working state. The aquaculture tail water enters the water inlet weir from the sedimentation tank. After being filtered by the three-layer filter screen, the clear water flows into the aeration tank, and the suspended solids in the tail water are intercepted by the filter screen and adhered to the filter screen. As the filtering progresses, the suspended solids adhered to the filter screen gradually increase, the filtering efficiency gradually weakens, and the passing volume of the tail water gradually decreases. Thus, the liquid level difference before and after the filter screen gradually increases. When the liquid level difference between the two liquid level transmitters before and after ≥ the set value, the filtering device enters the brushing state. The first gate opens, the second gate closes, the plug component closes, and the brush component reciprocates up and down. The suspended solids adhered to the filter screen are brushed off, and the water passing capacity of the filter screen gradually recovers. The liquid levels before and after the filter screen gradually reach the same level and are both at the high liquid level value. When the liquid level difference between the front and rear liquid level transmitters ≈ 0, for example, the liquid level difference between the two liquid level transmitters is less than or equal to 0.3 cm - 0.8 cm, it can be regarded as approximately equal to 0; and when both are at the high liquid level value, the sewage discharge program is started. At this time, the working states of each device terminal are: the first gate and the second gate close, the plug component opens, the brush component stops reciprocating up and down and stops at the upper position. As the sewage discharge process progresses, the liquid levels in the first filtering chamber and the second filtering chamber decrease simultaneously. When the liquid level difference between the front and rear liquid level transmitters ≈ 0 and both are at the low liquid level value, the filtering program is started, and each device terminal is in the reset state: the first gate and the second gate open, the plug component closes, and the brush component returns to the upper position to continue the filtering work. The above control process can be automatically controlled through a PLC controller.

[0143] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An automatic cleaning and filtering working method for aquaculture tail water, characterized in that, It includes the following steps: S0, filtering state; the filtering state is that the first gate and the second gate are in the open state, the plugging component is in the closed state, and the brush component returns to the upper position state; S1, determine the relationship between the liquid level difference between the two liquid level transmitters and the set value: If the liquid level difference between the two liquid level transmitters is less than the set value, execute step S0; If the liquid level difference between the two liquid level transmitters is greater than or equal to the set value, execute the next step; S2, brushing state; the brushing state is that the second gate is first in the closed state, and then the brush component moves up and down reciprocally; at this time, the first gate is in the open state, the second gate is in the closed state, the plugging component is in the closed state, and the brush component moves up and down reciprocally; S3, determine the relationship between the liquid level difference between the two liquid level transmitters and 0: If the liquid level difference between the two liquid level transmitters is approximately equal to 0, execute the next step; If the liquid level difference between the two liquid level transmitters is approximately not equal to 0, the brush component continues to move up and down reciprocally, and execute step S3; S4, sewage discharge state; the sewage discharge state is that the brush component first stops moving up and down reciprocally and stops at the upper position, then the first gate closes, and then the plugging component opens. At this time, the brush component stops moving up and down reciprocally and stops at the upper position, the first gate and the second gate are in the closed state, and the plugging component is in the open state; S5, determine the relationship between the liquid level difference between the two liquid level transmitters and 0, and whether it is at the low liquid level value: If the liquid level difference between the two liquid level transmitters is approximately equal to 0 and it is at the low liquid level value, execute the next step; Otherwise, continue to be in the sewage discharge state and execute step S5; S6, restart the filtering state; the restart filtering state is that the plugging component is in the closed state, and the first gate and the second gate are in the open state; at this time, the brush component stops at the upper position state, the plugging component is in the closed state, and the first gate and the second gate are in the open state; Return to step S0.

2. The automatic cleaning and filtering working method for aquaculture tail water according to claim 1, wherein In step S2, the control method for the second gate to change from the open state to the closed state is: The PLC controller sends a control signal to the second gate cylinder, and this control signal is a control signal to open the second gate. After the second gate cylinder receives the control signal sent by the PLC controller, the second gate cylinder controls the second gate to open.

3. The automatic cleaning and filtering working method for aquaculture tail water according to claim 1, wherein In step S2, the control method for the brush component to move up and down reciprocally is: S21, the PLC controller sends a control signal to the laser emitter, and this control signal is to control the laser emitter to emit laser. After the laser emitter receives the control signal sent by the PLC controller, the laser emitter emits laser every t ns; S22, the PLC controller sends a control signal to the brush cylinder, and this control signal is to control the telescopic rod of the brush cylinder to extend. After the brush cylinder receives the control signal sent by the PLC controller, the telescopic rod of the brush cylinder extends; S23, the PLC controller obtains the moment when the laser receiver collects the laser, and determines the downward movement distance of the brush based on the moment when the laser receiver collects the laser and the moment when the laser emitter emits the laser: d = d0 - c[t n -(t0 + nt)], Where, d is the downward movement distance of the brush; d0 is the height value between the cross beam and the box body when the brush stops at the upper position; c is the speed value of the laser; t n is the time when the laser receiver receives the laser for the nth time; t0 is the initial moment when the laser emitter emits laser; n is the number of times the laser emitter emits laser; t is the interval between laser emissions by the laser emitter; S24, determine the relationship between d and d max : If d = d max , the PLC controller sends a control signal to the brush cylinder. This control signal is to control the shortening of the telescopic rod of the brush cylinder. After the brush cylinder receives the control signal sent by the PLC controller, the telescopic rod of the brush cylinder shortens; proceed to the next step; If d > d max , then the telescopic rod of the brush cylinder continues to extend; step S24 is executed; d max is the preset maximum downward distance; S25. Determine the distance between the crossbeam and the box body based on the moment when the laser is collected by the laser receiver and the moment when the laser is emitted by the laser emitter: d′ = c[t n -(t0 + nt)], where d′ is the height value between the crossbeam and the box body; c is the speed value of the laser; t n is the moment when the laser receiver receives the laser for the nth time; t0 is the moment when the laser emitter initially emits laser; n is the number of times the laser emitter emits laser; t is the interval between laser emissions by the laser emitter; S26. Judge the relationship between d and d0: If d < d0, the telescopic rod of the brush cylinder continues to shorten; If d = d0, execute step S22; until the brush assembly stops reciprocating up and down and stops at the upper position.

4. The automatic cleaning and filtering working method for aquaculture tail water according to claim 1, wherein, In step S6, the control method for the plugging component to change from the open state to the closed state is: The PLC controller sends a control signal to the plug control cylinder. This control signal is a signal to control the closing of the plug body. After the plug control cylinder receives the control signal sent by the PLC controller, the plug control cylinder controls the plug body to close the sewage outlet; The PLC controller obtains the pressure value of the plug body on the pressure sensor collected by the pressure sensor and judges the relationship between P and P0: If P ≥ P0, the plugging component is in the closed state; the plug control cylinder stops working; If P < P0, the telescopic rod of the plug control cylinder continues to extend until P ≥ P0, where P is the pressure value collected by the pressure sensor and P0 is the preset pressure threshold.

5. An automatic cleaning and filtering device for aquaculture tail water, comprising a box body, characterized in that, One side of the box body is provided with a water inlet weir, and the opposite side is provided with a water outlet structure. Inside the box body, a first gate and a second gate are respectively arranged near the water inlet side and the water outlet side. At least three filter chambers are separated by partitions in the box body between the first gate and the second gate. A filter screen is arranged in the middle and lower part of the partition between adjacent filter chambers. The tail water enters the next filter chamber through the filter screen. On both sides of each filter screen, there is a brush assembly that can automatically move up and down along the filter screen to brush the filter screen. The laser assembly is used to measure the up and down movement distance of the brush assembly. The bottom surface of each filter chamber is provided with a sewage outlet, and each sewage outlet is equipped with a plugging component that can automatically open. The sewage outlet is connected to a sewage pipe.

6. The automatic cleaning and filtering device for aquaculture tail water according to claim 5, wherein, The brush assembly includes a brush mounting bracket. The brush bracket includes a crossbeam. On the lower side of the crossbeam, vertical mounting frames are respectively arranged on both sides of the filter screen. The vertical mounting frames pass through the top plate of the box body and extend into the box body. Brushes are respectively installed on the vertical mounting frames. Both sides of each filter screen are in contact with the corresponding brushes. The brush bracket is controlled by a brush cylinder to move up and down along the filter screen.

7. The automatic cleaning and filtering device for aquaculture tail water according to claim 5, wherein The plugging component includes a plug body matching the sewage outlet. A vertical rod is connected to the plug body. The vertical rod passes through the top surface of the box body and is connected to the plug control cylinder.

8. The automatic cleaning and filtering device for aquaculture tail water according to claim 5, wherein A spring cover is arranged on the top surface of the box body corresponding to the vertical rod. The top end of the vertical rod passes through the spring cover. A spring is sleeved on the vertical rod inside the spring cover. The top end of the spring contacts the top surface of the spring cover. A baffle with a diameter larger than the vertical rod is arranged on the vertical rod at the position corresponding to the lower end of the spring.

9. A computer system, characterized in that, Including: a processor; a memory for storing instructions executable by the processor; Wherein, when the processor is configured to execute the executable instructions, it implements the automatic cleaning and filtering working method for aquaculture tail water described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that, Including: A memory on which a computer program is stored; A processor for executing the program in the memory to implement the automatic cleaning and filtering working method for aquaculture tail water described in any one of claims 1 to 4.

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