阅读说明：本技术 一种污水过滤用滤网快速清理装置 (Quick cleaning device of filter screen for sewage filtration ) 是由 范丽 于 2021-09-15 设计创作，主要内容包括：本发明公开了污水处理领域的一种污水过滤用滤网快速清理装置,包括内部设置有滤网的污水处理箱,所述污水处理箱上开有位于滤网上方的入水口,污水处理箱上开有位于滤网下方出水口,所述出水口处设置有用于测量污水流速的流速感应器；所述滤网上设置有清理机构,所述清理机构沿平行于滤网的设置方向往复移动清理滤网上的滤渣,所述清理机构根据出水口流速大小调整清理频率大小。本发明能够通过测量出水口的流速判断滤网的堵塞程度,进而自动调节清理机构对滤网的清理频率,在保证过滤效率的情况下,延长滤网的使用时间,节省成本,提高效率。(The invention discloses a quick cleaning device for a filter screen for filtering sewage, which belongs to the field of sewage treatment and comprises a sewage treatment box, wherein the inside of the sewage treatment box is provided with the filter screen; be provided with clearance mechanism on the filter screen, clearance mechanism is along being on a parallel with the filter screen set up the filter residue on the direction reciprocating motion clearance filter screen, clearance mechanism is according to delivery port velocity of flow size adjustment clearance frequency size. The invention can judge the blocking degree of the filter screen by measuring the flow velocity of the water outlet, further automatically adjust the cleaning frequency of the cleaning mechanism to the filter screen, prolong the service time of the filter screen, save the cost and improve the efficiency under the condition of ensuring the filtering efficiency.)

1. The utility model provides a quick cleaning device of filter screen for sewage filters which characterized in that: the sewage treatment device comprises a sewage treatment box (1) internally provided with a filter screen (2), wherein a water inlet (11) positioned above the filter screen (2) is formed in the sewage treatment box (1), a water outlet (12) positioned below the filter screen (2) is formed in the sewage treatment box (1), and a flow velocity sensor (13) used for measuring the flow velocity of sewage is arranged at the water outlet (12); be provided with clearance mechanism (3) on filter screen (2), clearance mechanism (3) along being on a parallel with filter screen (2) set up the filter residue on the direction reciprocating motion clearance filter screen (2), clearance mechanism (3) are according to delivery port (12) velocity of flow size adjustment clearance frequency size.

2. The quick cleaning device of filter screen for sewage filtration of claim 1, characterized in that: the cleaning mechanism (3) comprises sliding blocks (31) which are slidably mounted on the side wall of the filter screen (2), the sliding direction of the sliding blocks (31) is consistent with the inclination direction of the filter screen (2), a first rotating shaft (32) is fixedly mounted on the sliding blocks (31), and a first gear (33) is rotatably mounted on the first rotating shaft (32); a second rotating shaft (34) is further rotatably mounted on the sliding block (31), a second gear (35) is fixedly mounted on the second rotating shaft (34), the first gear (33) is meshed with the second gear (35), and a cleaning roller (36) for cleaning filter residues on the filter screen (2) is fixedly mounted on the second rotating shaft (34); a first connecting rod (37) is further fixedly mounted on the first rotating shaft (32), one end of the first connecting rod (37) is fixedly mounted on the first rotating shaft (32), and the other end of the first connecting rod (37) and the second connecting rod (38) are coaxially and fixedly mounted on a connecting shaft (381); the connecting shaft (381) is connected with a third rotating shaft (382) which is rotatably installed on the sewage treatment box (1) through a second connecting rod (38), one end of the second connecting rod (38) is rotatably installed on the connecting shaft (381), the other end of the second connecting rod is fixedly installed on the third rotating shaft (382), and the third rotating shaft (382) is connected with an external power supply through a speed regulation unit (39).

3. The quick cleaning device of filter screen for sewage filtration of claim 2, characterized in that: the speed regulating unit (39) comprises a third gear (391) fixedly arranged on a third rotating shaft (382) and a speed regulating component slidably arranged on the sewage treatment tank (1), the speed regulating component comprises a plurality of coaxially arranged speed regulating gears (392), the speed regulating gears (392) are incomplete gears, the modulus of each speed regulating gear (392) is the same, and the number of teeth is different; the speed regulating gear (392) is fixedly arranged on a fourth rotating shaft (393), the fourth rotating shaft (393) slides on the sewage treatment box (1), the fourth rotating shaft (393) is connected with a driving cylinder (394) fixedly arranged on the sewage treatment box (1), and the driving cylinder (394) drives different speed regulating gears (392) to be meshed with the third gear (391).

4. The quick cleaning device of filter screen for sewage filtration of claim 3, characterized in that: be provided with in sewage treatment case (1) and be used for placing mounting rail (21) of filter screen (2), mounting rail (21) slope sets up, filter screen (2) are located the one end rotation of low level and install in mounting rail (21).

5. The quick cleaning device of filter screen for sewage filtration of claim 4, characterized in that: the utility model discloses a filter screen, including filter screen (2), vibration unit (4) that are used for vibrating filter screen (2) are provided with below filter screen (2), vibration unit (4) are located filter screen (2) ascending one end of slope, vibration unit (4) are according to delivery port (12) velocity of flow size adjustment vibration frequency size.

6. The quick cleaning device of filter screen for sewage filtration of claim 5, characterized in that: the vibration unit (4) comprises a fifth rotating shaft (41) rotatably mounted on the wall of the sewage treatment tank (1), and the fifth rotating shaft (41) is in synchronous transmission connection with the third rotating shaft (382); a rotating disc (42) is fixedly mounted on the fifth rotating shaft (41), a hydraulic telescopic rod (43) is slidably mounted on the disc surface of the rotating disc (42), and the hydraulic telescopic rod (43) is slidably arranged along the radial direction of the rotating disc (42); the fifth rotating shaft (41) is hollow, and liquid is filled in the fifth rotating shaft (41); one end of the hydraulic telescopic rod (43), which is far away from the fifth rotating shaft (41), is fixedly provided with a cam part (44) for vibrating the filter screen (2), and the other end of the hydraulic telescopic rod is communicated with the interior of the fifth rotating shaft (41); an extrusion column (45) is arranged at the end part of the fifth rotating shaft (41), one end of the extrusion column (45) is installed in the fifth rotating shaft (41) in a sliding mode along the body length direction of the fifth rotating column, the other end of the extrusion column is fixedly installed on a third connecting rod (46), the third connecting rod (46) is installed on a fourth rotating shaft (393) in a rotating mode, and when the driving cylinder (394) drives the fourth rotating column to move, the third connecting rod (46) moves synchronously.

7. The rapid cleaning device for the filtering screen of the sewage according to the claim 1 or 6, characterized in that: a first floating plate (5) and a second floating plate (51) are vertically and slidably mounted on the side wall of the sewage treatment tank (1), the first floating plate (5) is positioned above the filter screen (2), and the second floating plate (51) is positioned below the filter screen (2); the first floating plate (5) is fixedly connected with the second floating plate (51) through a supporting column (52); the top surface of the sewage treatment tank (1) is horizontally provided with a closing plate (53) used for closing the water inlet (11) in a sliding mode, the closing plate (53) is hinged to the first floating plate (5) through a fourth connecting rod (54), and the closing plate (53) is driven to close the water inlet (11) when the first floating plate (5) rises.

8. The quick cleaning device of filter screen for sewage filtration of claim 7, characterized in that: the filter screen (2) is provided with filter residue collecting bin (6) at the downward inclined end.

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to a quick cleaning device for a filter screen for sewage filtration.

Background

In our daily life and the factory production process, can produce a large amount of sewage, and these sewage adopt sewage filtration treatment mostly, and sewage filtration equipment is the main equipment that is used for handling sewage, and sewage filtration equipment is after filtering sewage for a long time, inevitably can produce the dirt in the filter screen net and pile up and block up, piles up in a large number and causes the device liquid circulation unsmooth very easily, phenomenon such as the unable timely processing of dirt, and then reduce sewage treatment effect and efficiency. Therefore, the filter screen needs to be cleaned frequently at present, and a cleaning roller is often adopted for cleaning; but if the cleaning frequency is too high, the structure of the filter screen can be damaged, and the service life of the filter screen is shortened; too low a frequency of cleaning may reduce the effect and efficiency of sewage treatment.

Therefore it is necessary to provide a quick cleaning device of filter screen for sewage filters, and the device can judge the jam degree of filter screen through the velocity of flow of measuring the delivery port, and then automatically regulated clearance mechanism is to the clearance frequency of filter screen, under the circumstances of guaranteeing filtration efficiency, prolongs the live time of filter screen, saves the cost, raises the efficiency.

Disclosure of Invention

The invention aims to provide a quick cleaning device for a filter screen for filtering sewage, which aims to solve the problems of the prior art in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a quick cleaning device for a filter screen for filtering sewage comprises a sewage treatment box, wherein the inside of the sewage treatment box is provided with the filter screen, a water inlet positioned above the filter screen is formed in the sewage treatment box, a water outlet positioned below the filter screen is formed in the sewage treatment box, and a flow velocity sensor for measuring the flow velocity of the sewage is arranged at the water outlet; be provided with clearance mechanism on the filter screen, clearance mechanism is along being on a parallel with the filter screen set up the filter residue on the direction reciprocating motion clearance filter screen, clearance mechanism is according to delivery port velocity of flow size adjustment clearance frequency size.

As a further scheme of the invention, the cleaning mechanism comprises a sliding block which is slidably mounted on the side wall of the filter screen, the sliding direction of the sliding block is consistent with the inclination direction of the filter screen, a first rotating shaft is fixedly mounted on the sliding block, and a first gear is rotatably mounted on the first rotating shaft; a second rotating shaft is further rotatably mounted on the sliding block, a second gear is fixedly mounted on the second rotating shaft, the first gear is meshed with the second gear, and a cleaning roller for cleaning filter residues on the filter screen is fixedly mounted on the second rotating shaft; a first connecting rod is fixedly arranged on the first rotating shaft, one end of the first connecting rod is fixedly arranged on the first rotating shaft, and the other end of the first connecting rod and the second connecting rod are coaxially and fixedly arranged on the connecting shaft; the connecting shaft is connected with a third rotating shaft which is rotatably arranged on the sewage treatment box through a second connecting rod, one end of the second connecting rod is rotatably arranged on the connecting shaft, the other end of the second connecting rod is fixedly arranged on the third rotating shaft, and the third rotating shaft is connected with an external power supply through a speed regulating unit.

As a further scheme of the invention, the speed regulating unit comprises a third gear fixedly arranged on a third rotating shaft and a speed regulating component slidably arranged on the sewage treatment tank, the speed regulating component comprises a plurality of coaxially arranged speed regulating gears, the speed regulating gears are incomplete gears, the modulus of each speed regulating gear is the same, and the number of teeth is different; the speed regulating gear is fixedly arranged on a fourth rotating shaft, the fourth rotating shaft slides on the sewage treatment box, the fourth rotating shaft is connected with a driving air cylinder fixedly arranged on the sewage treatment box, and the driving air cylinder drives different speed regulating gears to be meshed with the third gear.

As a further scheme of the invention, an installation rail for placing a filter screen is arranged in the sewage treatment tank, the installation rail is obliquely arranged, and one end of the filter screen at the lower position is rotatably installed in the installation rail.

As a further scheme of the invention, a vibration unit for vibrating the filter screen is arranged below the filter screen, the vibration unit is positioned at one end of the filter screen which is inclined upwards, and the vibration unit adjusts the vibration frequency according to the flow velocity of the water outlet.

As a further scheme of the invention, the vibration unit comprises a fifth rotating shaft which is rotatably arranged on the wall of the sewage treatment tank, and the fifth rotating shaft is in synchronous transmission connection with the third rotating shaft; a rotating disc is fixedly installed on the fifth rotating shaft, a hydraulic telescopic rod is installed on the disc surface of the rotating disc in a sliding mode, and the hydraulic telescopic rod is arranged in a sliding mode along the radial direction of the rotating disc; the fifth rotating shaft is hollow, and liquid is filled in the fifth rotating shaft; one end of the hydraulic telescopic rod, which is far away from the fifth rotating shaft, is fixedly provided with a cam part for vibrating the filter screen, and the other end of the hydraulic telescopic rod is communicated with the interior of the fifth rotating shaft; the end part of the fifth rotating shaft is provided with an extrusion column, one end of the extrusion column is slidably installed in the fifth rotating shaft along the extending direction of the fifth rotating column, the other end of the extrusion column is fixedly installed on a third connecting rod, the third connecting rod is rotatably installed on the fourth rotating shaft, and when the driving cylinder drives the fourth rotating column to move, the third connecting rod moves synchronously.

As a further scheme of the invention, a first floating plate and a second floating plate are vertically and slidably mounted on the side wall of the sewage treatment tank, the first floating plate is positioned above the filter screen, and the second floating plate is positioned below the filter screen; the first floating plate is fixedly connected with the second floating plate through a support column; the top surface of the sewage treatment tank is horizontally provided with a closing plate used for closing the water inlet in a sliding mode, the closing plate is hinged to the first floating plate through a fourth connecting rod, and the closing plate is driven to close the water inlet when the first floating plate rises.

As a further scheme of the invention, a filter residue collecting bin is arranged at one end of the filter screen which inclines downwards.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention can judge the blocking degree of the filter screen by measuring the flow velocity of the water outlet, further automatically adjust the cleaning frequency of the cleaning mechanism to the filter screen, prolong the service time of the filter screen, save the cost and improve the efficiency under the condition of ensuring the filtering efficiency.

2. According to the invention, the cleaning roller is driven to rotate when reciprocating, so that the friction force between the cleaning roller and the filter screen is increased, and the cleaning effect is improved.

3. According to the invention, different gears can be set, the cleaning rollers are driven to clean at different frequencies according to different degrees of filter screen blockage, and when the filter screen is seriously blocked, the cleaning rollers are cleaned at high frequency, so that the filtering efficiency of the filter screen can be recovered; when the filter screen blocks up slightly, the low frequency clearance can reduce the destruction of cleaning roller clearance to the filter screen, prolongs the life of filter screen under the circumstances of guaranteeing filtration efficiency, saves the cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of a rapid cleaning device for a filter screen for filtering sewage according to the present invention;

FIG. 2 is a schematic view showing the inside structure of the sewage treatment tank according to the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 2 according to the present invention;

FIG. 4 is a schematic view of the screen and cleaning mechanism of the present invention;

FIG. 5 is an enlarged view of a portion B of FIG. 4 in accordance with the present invention;

FIG. 6 is an enlarged view of a portion C of FIG. 4 in accordance with the present invention;

FIG. 7 is a schematic view of the structure of the orientation of the vibration unit of the present invention;

FIG. 8 is an enlarged view of a portion D of FIG. 7 in accordance with the present invention;

fig. 9 is a partial enlarged view of portion E of fig. 7 according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-sewage treatment tank, 11-water inlet, 12-water outlet, 13-flow velocity sensor, 2-filter screen, 21-mounting rail, 3-cleaning mechanism, 31-sliding block, 32-first rotating shaft, 33-first gear, 34-second rotating shaft, 35-second gear, 36-cleaning roller, 37-first connecting rod, 38-second connecting rod, 381-connecting shaft, 382-third rotating shaft, 39-speed regulating unit, 391-third gear, 392-speed regulating gear, 393-fourth rotating shaft, 394-driving cylinder, 4-vibrating unit, 41-fifth rotating shaft, 42-rotating disc, 43-hydraulic telescopic rod, 44-cam part, 45-extrusion column, 46-third connecting rod, 5-first floating plate, 51-second floating plate, 52-support column, 53-sealing plate, 54-fourth connecting rod and 6-collection bin.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, a rapid cleaning device for a filter screen 2 for filtering sewage comprises a sewage treatment tank 1 with the filter screen 2 arranged therein, wherein a water inlet 11 is formed on the sewage treatment tank 1 and is positioned above the filter screen 2, a water outlet 12 is formed on the sewage treatment tank 1 and is positioned below the filter screen 2, and a flow velocity sensor 13 for measuring the flow velocity of sewage is arranged at the water outlet 12; be provided with clearance mechanism 3 on the filter screen 2, clearance mechanism 3 is along being on a parallel with filter screen 2 set up the filter residue on the direction reciprocating motion clearance filter screen 2, clearance mechanism 3 is according to the 12 velocity of flow size adjustment clearance frequency sizes of delivery port.

In our daily life and the factory production process, can produce a large amount of sewage, and these sewage adopt sewage filtration treatment mostly, and sewage filtration equipment is the main equipment that is used for handling sewage, and sewage filtration equipment is after filtering sewage for a long time, inevitably can produce dirt in the 2 net of filter screen and pile up and block up, piles up very easily and causes the device liquid circulation unsmooth in a large number, phenomenon such as the unable timely processing of dirt, and then reduce sewage treatment effect and efficiency. Therefore, the filter screen 2 needs to be cleaned frequently at present, and the cleaning roller 36 is adopted for cleaning; however, if the cleaning frequency is too high, the structure of the filter screen 2 can be damaged, and the service life of the filter screen 2 is shortened; too low a frequency of cleaning may reduce the effect and efficiency of sewage treatment.

As shown in figures 1 and 2, when the device works, sewage to be treated is introduced from a water inlet 11 of a top sewage treatment tank 1, the sewage flows out from a water outlet 12 at the bottom of the sewage treatment tank 1 after being filtered by a filter screen 2, and the sewage flows by utilizing the gravity of the sewage to be filtered. As shown in fig. 6, the present invention is provided with a flow rate sensor 13 at the water outlet 12, wherein the flow rate sensor 13 measures the flow rate of the sewage passing through the water outlet 12, and the clogging degree of the filter screen 2 is determined by the flow rate. Under the condition that the water inlet flow rate of the water inlet 11 is constant, when the flow rate reduction amplitude of the water outlet 12 is larger, the blockage degree of the filter screen 2 is larger, the cleaning frequency of the cleaning mechanism 3 on the filter screen 2 is increased, and the larger the flow rate reduction is, the higher the cleaning frequency is, so that the blocked filter screen 2 can be dredged in time; when the flow rate of the water outlet 12 is not reduced, the filter screen 2 is normally filtered and is not blocked, the cleaning mechanism 3 stops cleaning the filter screen 2, and the service life of the filter screen 2 is prolonged. The invention can judge the blockage degree of the filter screen 2 by measuring the flow velocity of the water outlet 12, further automatically adjust the cleaning frequency of the cleaning mechanism 3 to the filter screen 2, prolong the service time of the filter screen 2 under the condition of ensuring the filtering efficiency, save the cost and improve the efficiency.

As a further scheme of the present invention, the cleaning mechanism 3 includes a sliding block 31 slidably mounted on the side wall of the filter screen 2, the sliding direction of the sliding block 31 is the same as the inclination direction of the filter screen 2, a first rotating shaft 32 is fixedly mounted on the sliding block 31, and a first gear 33 is rotatably mounted on the first rotating shaft 32; a second rotating shaft 34 is further rotatably mounted on the sliding block 31, a second gear 35 is fixedly mounted on the second rotating shaft 34, the first gear 33 is meshed with the second gear 35, and a cleaning roller 36 for cleaning filter residues on the filter screen 2 is fixedly mounted on the second rotating shaft 34; a first connecting rod 37 is further fixedly mounted on the first rotating shaft 32, one end of the first connecting rod 37 is fixedly mounted on the first rotating shaft 32, and the other end of the first connecting rod 37 and the second connecting rod 38 are coaxially and fixedly mounted on a connecting shaft 381; the connecting shaft 381 is connected with a third rotating shaft 382 rotatably installed on the sewage treatment tank 1 through a second connecting rod 38, one end of the second connecting rod 38 is rotatably installed on the connecting shaft 381, the other end is fixedly installed on the third rotating shaft 382, and the third rotating shaft 382 is connected with an external power supply through a speed regulation unit 39.

In practice the cleaning mechanism 3 needs to clean the entire surface of the sieve 2. As shown in fig. 4 and 5, when the flow rate measured by the flow rate sensor 13 is lower than the standard value, the cleaning mechanism 3 starts to operate, the third rotating shaft 382 rotatably mounted on the wall of the wastewater treatment tank 1 starts to rotate under the driving of the external power supply, the third rotating shaft 382 drives the sliding block 31 to slide through the second connecting rod 38 and the first connecting rod 37, and the sliding block 31 is slidably mounted on the side wall of the filter screen 2, so that the third rotating shaft 382, the second connecting rod 38, the first connecting rod 37 and the sliding block 31 constitute a crank-slider mechanism, and the sliding block 31 reciprocates on the side wall of the filter screen 2. Be provided with cleaning roller 36 on the interactive piece, cleaning roller 36 can reciprocate on filter screen 2 surface like this, has enlarged the clearance scope, guarantees that whole filter screen 2's surface can both be cleared up by cleaning roller 36. In order to improve the cleaning effect of the cleaning roller 36, the cleaning roller 36 is driven to rotate when the cleaning roller 36 reciprocates, so that the friction force between the cleaning roller 36 and the filter screen 2 is increased, and the cleaning effect is improved. As shown in fig. 5, the first link 37 and the second link 38 are connected by a connecting shaft 381, one end of the first link 37 is fixedly installed on the first rotating shaft 32, the other end of the first link 37 and the second link 38 are coaxially and fixedly installed on the connecting shaft 381, and the second link 38 is rotatably installed on the connecting shaft 381. When the slide block 31 reciprocates, the first link 37 also rotates around the first rotation shaft 32, the first link 37 drives the first rotation shaft 32 to rotate, and further the first gear 33 rotates, and the second rotation shaft 34 is driven by the second gear 35 to start to rotate because the first gear 33 is engaged with the second gear 35, so that the cleaning roller 36 rotates while the slide block 31 reciprocates, the friction force between the cleaning roller 36 and the screen 2 is increased, and the cleaning effect is improved.

As a further scheme of the present invention, the speed regulating unit 39 comprises a third gear 391 fixedly mounted on the third rotating shaft 382 and a speed regulating component slidably mounted on the sewage treatment tank 1, the speed regulating component comprises a plurality of coaxially mounted speed regulating gears 392, the speed regulating gears 392 are incomplete gears, the modules of the speed regulating gears 392 are the same, and the number of teeth is different; the speed regulating gear 392 is fixedly installed on the fourth rotating shaft 393, the fourth rotating shaft 393 slides on the sewage treatment tank 1, the fourth rotating shaft 393 is connected with the driving cylinder 394 fixedly installed on the sewage treatment tank 1, and the driving cylinder 394 drives the different speed regulating gear 392 to be meshed with the third gear 391.

The invention requires adjusting the cleaning frequency of the cleaning mechanism 3 according to the sewage flow rate of the water outlet 12. As shown in fig. 4 and 9, when the flow rate sensor 13 detects a decrease in the flow rate of the contaminated water, the driving cylinder 394 drives the third rotating shaft 382 to move inward, and the speed-adjusting gears 392 are fixedly mounted on the third rotating shaft 382, so that the driving cylinder 394 drives the different speed-adjusting gears 392 to mesh with the third gear 391. The speed regulating gear 392 is an incomplete gear, and the speed regulating gear 392 is sequentially arranged according to the number of teeth and is divided into gears with different sizes. As shown in fig. 9, when the flow rate sensor 13 detects that the flow rate of the sewage is reduced by a relatively large amount, which indicates that the filter screen 2 is clogged relatively severely, the driving cylinder 394 drives the third rotating shaft 382 to move a relatively large distance, so that the number of the speed regulating gear 392 engaged with the third gear 391 is relatively large, and thus, when the rotating speed of the third rotating shaft 382 is constant, the rotating speed of the third gear 391 is increased, so that the frequency of the reciprocating movement of the sliding block 31 is relatively high, the frequency of cleaning the cleaning roller 36 is relatively high, and the filter screen 2 can be cleaned by the cleaning roller 36 even though it is clean. When the filter screen 2 is cleaned, the filtering efficiency of the filter screen 2 is recovered, the sewage flow rate at the flow rate sensor 13 is recovered, the driving air cylinder 394 is driven to retract, the cleaning frequency of the cleaning roller 36 is reduced until the flow rate at the water outlet 12 is recovered to a standard value, the driving flag pole is driven to retract completely, the third gear 391 is not meshed with the speed regulating gear 392, and the cleaning roller 36 stops cleaning. According to the invention, different gears can be set, the cleaning roller 36 is driven to clean at different frequencies according to different degrees of blockage of the filter screen 2, and when the filter screen 2 is seriously blocked, the cleaning is carried out at high frequency, so that the filtering efficiency of the filter screen 2 can be recovered; when filter screen 2 blockked up slightly, the low frequency clearance can reduce 36 clearance of cleaning roller to filter screen 2's destruction, is guaranteeing the life of filter screen 2 under the circumstances of filtration efficiency extension, saves the cost.

As a further scheme of the invention, a mounting rail 21 for placing the filter screen 2 is arranged in the sewage treatment tank 1, the mounting rail 21 is obliquely arranged, and one end of the filter screen 2 at the lower position is rotatably arranged in the mounting rail 21.

As a further scheme of the invention, a vibration unit 4 for vibrating the filter screen 2 is arranged below the filter screen 2, the vibration unit 4 is positioned at one end of the filter screen 2 which is inclined upwards, and the vibration unit 4 adjusts the vibration frequency according to the flow velocity of the water outlet 12.

As a further scheme of the present invention, the vibration unit 4 comprises a fifth rotating shaft 41 rotatably mounted on the wall of the sewage treatment tank 1, and the fifth rotating shaft 41 is in synchronous transmission connection with the third rotating shaft 382; a rotating disc 42 is fixedly mounted on the fifth rotating shaft 41, a hydraulic telescopic rod 43 is slidably mounted on the disc surface of the rotating disc 42, and the hydraulic telescopic rod 43 is slidably arranged along the radial direction of the rotating disc 42; the fifth rotating shaft 41 is hollow, and liquid is filled in the fifth rotating shaft 41; one end of the hydraulic telescopic rod 43, which is far away from the fifth rotating shaft 41, is fixedly provided with a cam part 44 for vibrating the filter screen 2, and the other end of the hydraulic telescopic rod is communicated with the interior of the fifth rotating shaft 41; an extrusion column 45 is arranged at the end part of the fifth rotating shaft 41, one end of the extrusion column 45 is slidably installed in the fifth rotating shaft 41 along the body length direction of the fifth rotating column, the other end of the extrusion column 45 is fixedly installed on a third connecting rod 46, the third connecting rod 46 is rotatably installed on a fourth rotating shaft 393, and when the driving cylinder 394 drives the fourth rotating column to move, the third connecting rod 46 synchronously moves.

In order to clean and dredge the filter screen 2 when the filter screen 2 is seriously blocked, the invention is also provided with the vibration unit 4, and the vibration unit 4 adjusts the vibration frequency according to the flow velocity of the water outlet 12. As shown in fig. 3, the fifth rotating shaft 41 rotates to drive the cam portion 44 to repeatedly lift the screen 2, so that the screen 2 is vibrated, so that the cleaning roller 36 cleans the clogged residue. When the filter screen 2 is clogged seriously, the driving cylinder 394 drives the third rotating shaft 382 to move a large distance, the third rotating shaft 382 drives the third connecting rod 46 to move synchronously, the third connecting rod 46 drives the squeezing column 45 to squeeze the liquid in the fifth rotating shaft 41, and further drives the hydraulic type telescopic column to extend, so that the cam part 44 extends a large length. Thus, the cam part 44 vibrates the filter screen 2 to a larger extent, and the auxiliary cleaning roller 36 dredges the filter screen 2 in time; when the screen 2 is slightly clogged, the driving cylinder 394 drives the third rotating shaft 382 to move a small distance, the squeezing columns 45 squeeze the liquid in the fifth rotating shaft 41 to a small extent, the hydraulic telescopic column extension distance is small, and the cam portion 44 vibrates the screen 2 to a small extent. The invention also provides a vibration unit 4 which repeatedly vibrates the filter screen 2, the auxiliary cleaning roller 36 cleans the filter screen 2, the extension amount of the hydraulic telescopic rod 43 is adjusted by utilizing the movement of the third rotating shaft 382, and the vibration amplitude of the cam part 44 to the filter screen 2 is further controlled.

As a further scheme of the invention, a first floating plate 5 and a second floating plate 51 are vertically and slidably mounted on the side wall of the sewage treatment tank 1, the first floating plate 5 is positioned above the filter screen 2, and the second floating plate 51 is positioned below the filter screen 2; the first floating plate 5 is fixedly connected with the second floating plate 51 through a support column 52; a closing plate 53 for closing the water inlet 11 is horizontally and slidably installed on the top surface of the sewage treatment tank 1, the closing plate 53 is hinged to the first floating plate 5 through a fourth connecting rod 54, and the closing plate 53 is driven to close the water inlet 11 when the first floating plate 5 rises.

In actual practice, in order to prevent sewage from being collected in the sewage treatment tank 1 in a large amount and overflowing due to clogging of the screen 2, the present invention provides the first floating plate 5 and the second floating plate 51. As shown in fig. 7 and 8, when the filter screen 2 is seriously clogged, the accumulated water on the upper part of the filter screen 2 is serious, at this time, the first floating plate 5 floats upwards, the closing plate 53 is driven by the fourth connecting rod 54 to gradually close the water inlet 11, and the sewage is prevented from continuously entering and then overflowing. Similarly, if sewage accumulates in the lower portion of the screen 2, it is necessary to close the water inlet 11. When the sewage in the lower part of the screen 2 is accumulated, the second floating plate 51 floats up, and the first floating plate 5 is driven to float up by the supporting column 52, and enters the driving closing plate 53 to close the water inlet 11. The invention can control the opening and closing of the water inlet 11 according to the water level of the sewage treatment tank 1, and avoid the influence on the filtration of the filter screen 2 caused by more accumulated water overflowing from the sewage treatment tank 1.

As a further scheme of the invention, a filter residue collecting bin 6 is arranged at one end of the filter screen 2 which inclines downwards. This arrangement is to collect the cleaned filter residue.