Water quality purification device mounted at water outlet of farm

Abstract

The invention relates to the field of sewage treatment, in particular to a water quality purification device mounted at a water outlet of a farm. The invention relates to a water quality purification device which is directly mounted at a water outlet of a farm, has automatic net cleaning and impurity discharge functions and comprises a water discharge end and the like, the drainage end is installed in the culture pond and extends out of an aquaculture plant, the drainage end has a stepped drainage function, a diffusion frame is arranged at a drainage port of the drainage end, sewage passing through the diffusion frame is dispersed to reduce the flow speed, and a rolling filtering mechanism is installed in the diffusion frame. Water in the culture pond is discharged from top to bottom through the drainage end, sewage is discharged into the diffusion frame for speed reduction, after the flow speed is reduced, the sewage enters the rolling filtering mechanism to be filtered, in the sewage filtering process, impurities in the rolling filtering mechanism are flushed into the slag discharging mechanism through the cleaning mechanism, and the impurities in the rolling filtering mechanism are removed through the slag discharging mechanism. And the slag discharging mechanism discharges the collected impurities, so that the effect of continuously treating the sewage is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a water quality purification device installed at the drainage outlet of a breeding farm. BACKGROUND

[0002] In the process of intensive aquaculture, due to high-density feeding and biological metabolic activity, a large amount of solid pollutants such as residual feed, fish or shrimp excrement, shed biological membranes, and algal debris will continuously be produced in the breeding water body. These substances enter the tail water system with the water change or drainage, resulting in high suspended solids concentration, large organic load, and high turbidity in the breeding tail water.

[0003] Chinese utility model patent CN219010019U discloses a kind of aquaculture sewage filtering device, and the device includes stirring barrel, stirring mechanism, water inlet pipe, water outlet pipe and filtering mechanism.The working principle is as follows: by stirring mechanism, chemical flocculants are mixed with sewage, so that suspended solids are precipitated in support barrel, and after further filtering by filtering mechanism, treated water is discharged. However, the device has the following deficiencies: 1. Manual cleaning of precipitates: Although a lifting mechanism is provided to facilitate the removal of the support barrel for cleaning, manual cleaning is still required at regular intervals, which cannot achieve automatic continuous operation, increasing operation and maintenance costs and time consumption.

[0004] 2. Fixed filter cloth is easily clogged: Although the filter cloth installed inside the water outlet pipe can effectively filter a small amount of precipitates, under the impact of high-concentration suspended solids, the filter cloth is easily clogged, resulting in increased water resistance, and the filter cloth needs to be replaced or cleaned frequently, affecting the long-term stability of the equipment.

[0005] 3. Independent equipment structure is complex: As an independent equipment, the device needs to be additionally configured with a booster pump and pipeline connection, which is not convenient for direct integration and installation at the drainage outlet of the breeding farm, increasing the complexity and construction cost of the system.

[0006] Therefore, it is urgent to develop a water quality purification device installed at the drainage outlet of a breeding farm, which has the functions of automatic screen cleaning and impurity discharge. SUMMARY

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the present application provides a water quality purification device installed at the drainage outlet of a breeding farm, which has the functions of automatic screen cleaning and impurity discharge.

[0008] The technical implementation of the present application is: a water quality purification device installed at the drainage outlet of a farm, comprising a drainage end, a diffusion frame, a rolling filter mechanism, a cleaning mechanism and a residue discharge mechanism, the drainage end is installed in the aquaculture pond and extends outside the aquaculture farm, the drainage end has a stepped drainage function, a diffusion frame is arranged at the drainage outlet of the drainage end, sewage passing through the diffusion frame is dispersed to reduce the flow rate, the rolling filter mechanism is installed in the diffusion frame, part of the rolling filter mechanism is in the diffusion frame, a cleaning mechanism is arranged above the rolling filter mechanism to clean the rolling filter mechanism by flushing, a residue discharge mechanism is arranged in the rolling filter mechanism, impurities cleaned from the rolling filter mechanism enter the residue discharge mechanism and are discharged; the rolling filter mechanism comprises a filter frame, one end of the filter frame is designed to be sealed, the inner side of the sealing surface is a tapered surface that is recessed inward, a reinforcing rib is arranged on the outer side of the filter frame along the axial direction, and the inner side of the filter frame is provided with a circle of inclined plates whose inclination direction is opposite to the rotation direction of the filter frame.

[0009] As a further preferred solution, the drainage end comprises an extension pipe, a stepped drainage pipe and a threaded cap, the extension pipe extends from the aquaculture pond to outside the pond, the water inlet end of the extension pipe is detachably connected to the threaded cap, and the stepped drainage pipe is arranged above the water inlet end of the extension pipe and is composed of a plurality of vertically arranged pipe joints.

[0010] As a further preferred solution, the diffusion frame has a larger diameter than the extension pipe, and the diffusion frame near the water outlet end of the extension pipe is tapered outward.

[0011] As a further preferred solution, the rolling filter mechanism further comprises a mounting plate, a rotating shaft, a rotary motor and a transmission belt pulley set, the top of the diffusion frame is provided with a mounting plate, the rotating shaft is rotatably mounted in the middle of the mounting plate, one side of the rotating shaft near the water outlet end of the extension pipe is fixedly connected to the filter frame, one side of the filter frame near the water outlet end of the extension pipe is not sealed to facilitate the entry of sewage into the filter frame, the rotary motor is mounted on the side wall of the diffusion frame, and the transmission belt pulley set is connected between the rotary motor and the rotating shaft.

[0012] As a further preferred solution, the cleaning mechanism comprises a spray pipe, a conical nozzle, a baffle, a ball valve and a speed regulating motor, the spray pipe is arranged on the upper side of the filter frame along the axial direction, a row of conical nozzles is arranged on the bottom of the spray pipe, baffles are obliquely arranged on the front and rear sides of the spray pipe, the two baffles are combined into an inverted eight-shaped structure, the ball valve is arranged on the liquid inlet end of the spray pipe, and the speed regulating motor is connected to the valve rod of the ball valve.

[0013] As a further preferred solution, the residue discharge mechanism comprises a tapered frame and a sewage discharge pipe, the tapered frame is arranged in the upper part of the filter frame along the axial direction and is recessed downward, and the sewage discharge pipe is arranged at the end of the tapered frame.

[0014] As a further preferred scheme, a secondary filtering mechanism is further included, which is installed in the diffusion frame, and the secondary filtering mechanism comprises the plug-in plates, the baffle plates and the filter screens, the plug-in plates are symmetrically arranged in the diffusion frame, the side close to the rolling filtering mechanism of the plug-in plates is inclined, the baffle plates are slidably connected between the plug-in plates, the filter screens are arranged on the middle upper part of the baffle plates, the pore size of the filter screens is smaller than that of the filtering frame, and a slot is arranged on the upper part of the baffle plate.

[0015] As a further preferred scheme, a secondary filtering mechanism is further included, which is installed in the diffusion frame, and the secondary filtering mechanism comprises the plug-in plates, the baffle plates and the filter screens, the plug-in plates are symmetrically arranged in the diffusion frame, the side close to the rolling filtering mechanism of the plug-in plates is inclined, the baffle plates are slidably connected between the plug-in plates, the filter screens are arranged on the middle upper part of the baffle plates, the pore size of the filter screens is smaller than that of the filtering frame, and a slot is arranged on the upper part of the baffle plate.

[0016] The application has the following advantages: the water in the breeding pond is discharged from top to bottom by the drainage end, the sewage is discharged into the diffusion frame to reduce the speed, the sewage entering the rolling filtering mechanism is filtered after the speed is reduced, in the process of filtering the sewage, the cleaning mechanism flushes the impurities in the rolling filtering mechanism into the slag discharge mechanism, the slag discharge mechanism discharges the collected impurities, so that the continuous sewage treatment effect is achieved, and in the process of cleaning the impurities, the impurities attached to the surface of the filtering frame cannot fall back to the lower part of the filtering frame in the process of upward rotation due to the blocking effect of the inclined plate, so that the subsequent cleaning and discharge of the impurities are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective structural schematic view of the application.

[0018] Figure 2 It is a perspective structural schematic view of the drainage end of the application.

[0019] Figure 3 It is a perspective structural schematic view of the rolling filtering mechanism of the application.

[0020] Figure 4 It is a perspective structural schematic view of the rolling filtering mechanism of the application. Figure 3 It is a perspective structural schematic view of the rolling filtering mechanism of the application.

[0021] Figure 5 It is a perspective structural schematic view of the cleaning mechanism of the application.

[0022] Figure 6 It is a perspective structural schematic view of the slag discharge mechanism of the application.

[0023] Figure 7 This is a three-dimensional structural diagram of the two-stage filtration mechanism of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the drug dispensing mechanism of the present invention.

[0025] Among them: 1-drainage end, 11-extension pipe, 12-step drainage pipe, 13-threaded cover, 2-diffuser frame, 3-rolling filter mechanism, 31-mounting plate, 32-rotating shaft, 33-filter frame, 331-conical surface, 332-sloping plate, 333-reinforcing rib, 34-rotating motor, 35-transmission pulley set, 4-cleaning mechanism, 41-spray pipe, 42-conical nozzle, 43-partition plate, 44-ball valve, 45-speed regulating motor, 5-slag discharge mechanism, 51-conical frame, 52-sewage pipe, 6-secondary filter mechanism, 61-insertion plate, 611-sloping surface, 62-baffle, 621-straight hole, 63-filter screen, 7-dosing mechanism, 71-guide seat, 72-dosing pipe, 73-turntable, 74-shaft clamp, 75-U-shaped plate. Detailed Implementation

[0026] The technical solution will be further described below with reference to specific embodiments. It should be noted that the terms "up," "down," "left," and "right" used in this document refer only to the position of the structure shown in the corresponding drawings. The serial numbers assigned to components in this document, such as "first," "second," etc., are only used to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, terms such as "connection" and "linkage" in this application include both direct and indirect connections (linkages).

[0027] Example: A water purification device installed at the drainage outlet of a fish farm, such as... Figures 1-6 As shown, it includes a drain end 1, a diffuser frame 2, a rolling filter mechanism 3, a cleaning mechanism 4, and a slag discharge mechanism 5. The drain end 1 is installed inside the aquaculture pond and extends outside the aquaculture farm. The drain end 1 has a stepped drainage function, allowing water in the aquaculture pond to be discharged from top to bottom. A diffuser frame 2 is installed at the drain outlet of the drain end 1. The sewage passing through the diffuser frame 2 is dispersed and the flow rate is reduced, ensuring the filtration time of the sewage and reducing the impact force of the sewage on the filter components. The rolling filter mechanism 3 is installed inside the diffuser frame 2. The rolling filter mechanism 3 is partially located inside the diffuser frame 2. By rotating, the position of the filter components is changed so that the sewage is not filtered on the same filter component at the same time, preventing clogging. A cleaning mechanism 4 is installed above the rolling filter mechanism 3. When impurities on the rolling filter mechanism 3 pass under the cleaning mechanism 4, the rolling filter mechanism 3 is cleaned by flushing. A slag discharge mechanism 5 is installed inside the rolling filter mechanism 3. The impurities cleaned from the rolling filter mechanism 3 enter the slag discharge mechanism 5 and are discharged.

[0028] A water purification device installed at the outlet of a farm, in use: first through the drainage end 1 from the top to the bottom of the water in the culture pond discharge, sewage into the diffusion frame 2, the flow rate after entering the rolling filter mechanism 3, the rolling filter mechanism 3 on the incoming sewage filtration, in the process of filtering sewage, cleaning mechanism 4 will rolling filter mechanism 3 in the impurities into the slag discharge mechanism 5, the slag discharge mechanism 5 will collect the impurities discharged, to achieve continuous operation.

[0029] As Figure 2 shown, the drainage end 1 includes a pipe 11, 11, 12 and 13, the pipe 11 from the culture pond to the outside of the pool, the pipe 11 can be inclined 1°-5° high outside the bottom of the installation, so as to accelerate the discharge of sewage, the pipe 11 of the water inlet end detachable connection screw cap 13, the pipe 11 of the water inlet end above the setting of the ladder drainage pipe 12, the ladder drainage pipe 12 by a plurality of vertical installation of the pipe butt joint, butt joint position with sealant to complete the sealing; when the need to discharge the culture pond sewage, first unscrew the top of the pipe 12, when the ladder drainage pipe 12 upper end surface below the water surface, sewage begins to discharge, in turn repeated until the sewage can not be discharged through the ladder drainage pipe 12, at this time unscrew the screw cap 13, the remaining sewage directly through the pipe 11 discharge outside the pool, this way can ensure that the pool of sewage to maximize the discharge, reduce the use of water pump drainage time, and from the top to the bottom of the gradient drainage, can prevent the culture of aquatic organisms in the culture pond is sucked into the discharge.

[0030] As Figure 1 and Figure 2 shown, the diffusion frame 2 is greater than the pipe 11 of the diameter, the diffusion frame 2 near the pipe 11 out of the water end is outwardly tapered; in the sewage through the pipe 11 discharge, because of the larger diameter, the flow rate of sewage into the diffusion frame 2 after the reduction, for subsequent filtration ready.

[0031] As Figure 3 and Figure 4As shown in the drawings, the rolling filter mechanism 3 comprises a mounting plate 31, a rotating shaft 32, a filter frame 33, a rotary motor 34 and a transmission pulley set 35. The mounting plate 31 is arranged on the top of the diffusion frame 2. The rotating shaft 32 is rotatably arranged on the middle of the mounting plate 31 by a bearing seat. The filter frame 33 is fixedly connected to the side of the rotating shaft 32 close to the water outlet end of the outer tube 11. The filter frame 33 is cylindrical. The side of the filter frame 33 close to the water outlet end of the outer tube 11 is not sealed. The bottom of the diffusion frame 2 on the left side of the filter frame 33 is in a slope shape, so as to facilitate the sewage to enter the filter frame 33. The other end of the filter frame 33 is sealed. The inner side of the sealing surface is a tapered surface 331 which is inwardly recessed. When the sewage hits the right wall of the filter frame 33, the sewage is diffused outwardly for filtration, so as to prevent the sewage from remaining in the filter frame 33. The rotary motor 34 is arranged on the side wall of the diffusion frame 2. The transmission pulley set 35 is connected between the rotary motor 34 and the rotating shaft 32. The filter frame 33 is driven to rotate synchronously by the rotary motor 34 and the transmission pulley set 35.

[0032] The rolling filter mechanism 3: when the sewage is filtered, the rotary motor 34 is controlled to rotate clockwise. The filter frame 33 is driven to rotate by the transmission pulley set 35. The sewage enters the filter frame 33 through the left end of the filter frame 33. The filter frame 33 filters the sewage. The impurities in the sewage are intercepted in the filter frame 33. Because the filter frame 33 can rotate clockwise, the position of the filter frame 33 can be changed, so as to prevent the filter frame 33 from being blocked due to the unchanged filtering position. After the sewage is filtered, the rotary motor 34 is controlled to stop working.

[0033] As shown in the drawings, Figure 3 and Figure 4 the outer side of the filter frame 33 is provided with a reinforcing rib 333 along the axial direction, so as to reinforce the strength of the filter frame 33. The inner side of the filter frame 33 is provided with a slanted plate 332 along the axial direction. The inclination direction of the slanted plate 332 is opposite to the rotating direction of the filter frame 33. During the rotation of the filter frame 33, because of the blocking effect of the slanted plate 332, the impurities attached to the surface of the filter frame 33 will not fall back to the lower part of the filter frame 33 during the upward rotation, so as to facilitate the subsequent cleaning and discharge of the impurities.

[0034] As shown in the drawings, Figure 5As shown, the cleaning mechanism 4 includes a spray pipe 41, a conical nozzle 42, a baffle 43, a ball valve 44 and a speed regulating motor 45, the upper part of the filter frame 33 is provided with the spray pipe 41 along the axial direction, the end of the spray pipe 41 is fixed on the mounting plate 31, the bottom of the spray pipe 41 is uniformly and spacedly provided with a row of conical nozzles 42, the front and rear sides of the spray pipe 41 are both obliquely provided with the baffle 43, the two baffles 43 are combined into an inverted eight-shaped, the baffle 43 is fixedly connected with the mounting plate 31, the liquid inlet end of the spray pipe 41 is provided with the ball valve 44, the valve stem of the ball valve 44 is connected with the speed regulating motor 45, the speed regulating motor 45 is fixedly connected with the fixing part of the spray pipe 41, the flow of the water flow in the spray pipe 41 is controlled by controlling the rotation of the speed regulating motor 45, so as to control the speed of the conical nozzle 42; in the process of sewage treatment, the spray pipe 41 is connected with the external water source, then the speed regulating motor 45 is controlled to rotate to open the ball valve 44, the water flow is sprayed on the filter frame 33 through the conical nozzle 42, so that the impurities attached to the filter frame 33 are washed down to enter the slag discharge mechanism 5 to be discharged, at the same time, the speed of the conical nozzle 42 can be adjusted in real time through the speed regulating motor 45, so as to meet the different degrees of sewage filtration requirements, the more impurities, the faster the water flow, the less impurities, the smaller the water flow, at the same time, the effect of saving water is also achieved.

[0035] As shown in Figure 6 The slag discharge mechanism 5 includes a conical frame 51 and a sewage discharge pipe 52, the upper part of the filter frame 33 is provided with the downwardly recessed conical frame 51 along the axial direction, the conical frame 51 is below the spray pipe 41, the end of the conical frame 51 is provided with the sewage discharge pipe 52, the sewage discharge pipe 52 is fixedly connected with the diffusion frame 2 to fix the conical frame 51 and the sewage discharge pipe 52; the impurities washed down by the cleaning mechanism 4 enter the conical frame 51 to be collected, then are discharged through the sewage discharge pipe 52.

[0036] As shown in Figure 7 It also includes a secondary filtering mechanism 6, the secondary filtering mechanism 6 is installed in the diffusion frame 2, the secondary filtering mechanism 6 includes a plug plate 61, a baffle 62 and a filter screen 63, the plug plate 61 is symmetrically arranged in the diffusion frame 2, the side of the plug plate 61 close to the rolling filtering mechanism 3 is a slope 611, so as to prevent the impurities from being blocked by the plug plate 61, the baffle 62 is slidably connected between the plug plates 61, the middle and upper part of the baffle 62 is provided with the filter screen 63, only when the water depth in the diffusion frame 2 is higher than the bottom of the filter screen 63, the sewage can flow out through the filter screen 63, so that the water flow speed is reduced again, so as to prepare for the secondary filtration, the aperture of the filter screen 63 is smaller than the aperture of the filter frame 33, so that smaller impurities can be filtered, the upper part of the baffle 62 is provided with a slot 621, the baffle 62 is pulled out upward through the slot 621, so that the residual water in the diffusion frame 2 is discharged.

[0037] As shown in Figure 8The device also includes a dosing mechanism 7, which is arranged between the secondary filtering mechanism 6 and the rolling filtering mechanism 3. The dosing mechanism 7 includes a guide seat 71, a dosing pipe 72, a rotating disc 73, a clamping shaft 74, and a square plate 75. The guide seats 71 are symmetrically arranged on the diffusion frame 2 between the secondary filtering mechanism 6 and the rolling filtering mechanism 3. The dosing pipe 72 is slidably connected between the guide seats 71. The end of the rotating shaft 32 is concentrically provided with the rotating disc 73. The clamping shaft 74 is arranged at an eccentric position on the outer side of the rotating disc 73. The middle part of the dosing pipe 72 is vertically provided with the square plate 75, which is slidably connected with the clamping shaft 74. When there are a large amount of colloids or fine suspended matters in the sewage, a coagulant aid needs to be added. At this time, the dosing pipe 72 can be connected with a medicament outlet. The medicament is sprayed into the sewage through the dosing pipe 72. During the rotation of the rotating shaft 32, the rotating disc 73 and the clamping shaft 74 are driven to rotate, so that the dosing pipe 72 moves forward and backward to add medicament, thereby improving the dosing range. At the same time, because the water flow speed below the dosing pipe 72 is slow, the fine suspended matters in the sewage are further accelerated to coagulate.

[0038] While the disclosure has been illustrated and described with reference to certain exemplary embodiments thereof, it is understood that various other changes and modifications can be made in form and details by those skilled in the art without departing from the spirit and scope of the disclosure as defined in the appended claims and their equivalents. Therefore, the scope of the disclosure should not be limited to the above-described embodiments, but should be defined only by the appended claims and equivalents thereof.

Claims

1. A water purification device installed at the drainage outlet of a livestock farm, characterized in that: It includes a drain end (1), a diffusion frame (2), a rolling filter mechanism (3), a cleaning mechanism (4), and a slag removal mechanism (5). The drain end (1) is installed inside the aquaculture pond and extends outside the aquaculture farm. The drain end (1) has a stepped drainage function. A diffusion frame (2) is provided at the drain outlet of the drain end (1). The sewage passing through the diffusion frame (2) is dispersed and the flow rate is reduced. A rolling filter mechanism (3) is installed inside the diffusion frame (2). Part of the rolling filter mechanism (3) is located inside the diffusion frame (2). A cleaning mechanism (4) is provided above the rolling filter mechanism (3) to clean the rolling filter mechanism by flushing. (3) Cleaning is performed. The rolling filter mechanism (3) is equipped with a slag discharge mechanism (5). The impurities cleaned by the rolling filter mechanism (3) are discharged into the slag discharge mechanism (5). The rolling filter mechanism (3) includes a filter frame (33). One end of the filter frame (33) is sealed, and the inner side of the sealing surface is a tapered surface (331) that is recessed inward. A reinforcing rib (333) is provided on the outer side of the filter frame (33) along its axial direction. A inclined plate (332) is provided on the inner side of the filter frame (33) along its axial direction. The inclination direction of the inclined plate (332) is opposite to the rotation direction of the filter frame (33).

2. The water purification device installed at the drainage outlet of a livestock farm according to claim 1, characterized in that: The drainage end (1) includes an extension pipe (11), a stepped drainage pipe (12) and a threaded cap (13). The extension pipe (11) extends from inside the aquaculture pond to outside the pond. The water inlet end of the extension pipe (11) is detachably connected to the threaded cap (13). A stepped drainage pipe (12) is provided above the water inlet end of the extension pipe (11). The stepped drainage pipe (12) is composed of multiple vertically installed pipes connected together.

3. A water purification device installed at the drainage outlet of a livestock farm according to claim 2, characterized in that: The diameter of the diffuser frame (2) is larger than that of the outer tube (11), and the diffuser frame (2) near the water outlet end of the outer tube (11) is a cone shape that diffuses outward.

4. A water purification device installed at the drainage outlet of a livestock farm according to claim 2, characterized in that: The rolling filter mechanism (3) also includes a mounting plate (31), a rotating shaft (32), a rotating motor (34), and a transmission pulley set (35). The top of the diffuser frame (2) is provided with a mounting plate (31). The rotating shaft (32) is rotatably mounted in the middle of the mounting plate (31). The side of the rotating shaft (32) near the water outlet end of the extension pipe (11) is fixed to the filter frame (33). The side of the filter frame (33) near the water outlet end of the extension pipe (11) is not sealed to facilitate the entry of sewage into the filter frame (33). The side wall of the diffuser frame (2) is equipped with a rotating motor (34). The rotating motor (34) and the rotating shaft (32) are connected by a transmission pulley set (35).

5. A water purification device installed at the drainage outlet of a livestock farm according to claim 4, characterized in that: The cleaning mechanism (4) includes a spray pipe (41), a conical nozzle (42), a baffle (43), a ball valve (44), and a speed-regulating motor (45). The spray pipe (41) is arranged on the upper part of the filter frame (33) along its axial direction. A row of conical nozzles (42) is arranged at the bottom of the spray pipe (41). Baffles (43) are inclined on both the front and rear sides of the spray pipe (41). The two baffles (43) are combined to form an inverted V-shape. A ball valve (44) is arranged at the liquid inlet end of the spray pipe (41). A speed-regulating motor (45) is connected to the valve stem of the ball valve (44).

6. A water purification device installed at the drainage outlet of a livestock farm according to claim 5, characterized in that: The slag discharge mechanism (5) includes a conical frame (51) and a sewage pipe (52). The upper part of the filter frame (33) is provided with a conical frame (51) that is recessed downward along its axial direction. The end of the conical frame (51) is provided with a sewage pipe (52).

7. A water purification device installed at the drainage outlet of a livestock farm according to claim 1, characterized in that: It also includes a secondary filtration mechanism (6), which is installed inside the diffusion frame (2). The secondary filtration mechanism (6) includes a plate (61), a baffle (62), and a filter screen (63). The plate (61) is symmetrically arranged inside the diffusion frame (2). The side of the plate (61) near the rolling filter mechanism (3) is an inclined surface (611). The baffle (62) is slidably connected between the plates (61). The filter screen (63) is arranged in the upper middle part of the baffle (62). The aperture of the filter screen (63) is smaller than the aperture of the filter frame (33). A slotted hole (621) is opened on the upper part of the baffle (62).

8. A water purification device installed at the drainage outlet of a livestock farm according to claim 7, characterized in that: It also includes a dosing mechanism (7), which is provided between the secondary filtration mechanism (6) and the rolling filtration mechanism (3). The dosing mechanism (7) includes a guide seat (71), a dosing tube (72), a turntable (73), a retaining shaft (74), and a U-shaped plate (75). The guide seats (71) are symmetrically arranged on the diffusion frame (2) between the secondary filtration mechanism (6) and the rolling filtration mechanism (3). The dosing tube (72) is slidably connected between the guide seats (71). The turntable (73) is concentrically arranged at the end of the rotating shaft (32). The retaining shaft (74) is eccentrically arranged on the outer side of the turntable (73). The U-shaped plate (75) is vertically arranged in the middle of the dosing tube (72). The U-shaped plate (75) is slidably connected to the retaining shaft (74).

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