CN118388093A - A sewage treatment device - Google Patents

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment device, which comprises a box body, wherein a stirring tank, a dissolved air tank, a slag discharge tank and a wastewater tank are formed in the box body through a partition plate, a scraping mechanism is arranged at the upper end of the slag tank, and a filter plate slag discharge mechanism for filtering scum in the slag tank is arranged at one side of the partition plate between the slag tank and the slag discharge tank. The filter plate slag discharging mechanism comprises a slag filtering plate, a driving mechanism for driving the slag filtering plate to reciprocate up and down is arranged on the side face of the slag floating tank, a support shaft is arranged on one side of the slag filtering plate, movable guide shafts are arranged at two ends of the support shaft, and guide grooves matched with the movable guide shafts are formed in the inner wall of the slag floating tank. The filter plate slag discharging mechanism reduces the water content in the waste slag and the energy consumption of the subsequent waste slag treatment through effective scum treatment and discharge, and in addition, the scum shifting plate assembly can smoothly finish scum shifting and can realize a self-cleaning function.

Description

A sewage treatment device

Technical Field

The invention relates to the technical field of sewage treatment, and in particular to a sewage treatment device.

Background technique

The flotation machine is a wastewater treatment equipment that can float and separate suspended matter. Its principle is to generate a large number of tiny bubbles in the water, so that the air is attached to the suspended matter particles in the form of highly dispersed tiny bubbles, resulting in a state with a density lower than that of water. The buoyancy principle is used to make it float on the water surface, thereby achieving solid-liquid separation.

At present, in the process of sewage treatment using flotation machines, the scum is scraped into a collection tank through a scraping structure. In this process, the scraping device takes away a large amount of water, that is, the solid-liquid separation cannot be achieved well. When the discharged scum contains a large amount of water, water filtration is required in the later stage, which consumes a lot of work and energy and affects the overall treatment efficiency.

In the prior art, a Chinese patent document with the authorization announcement number CN117699897B discloses a flotation machine for sewage treatment and its working method, including a scraping device, the scraping device is arranged in the machine body, and the scraping device is suitable for scraping impurities floating on the surface of sewage; the scraping device includes: a driving mechanism and a plurality of scraping components, and the scraping components include: a support bar, a bearing plate, an outer plate and an inner plate. In the specific use process, when the impurities on the surface of sewage are scraped by the scraping component, a large amount of water and impurities will also be scraped together, and the separation of water and impurities cannot be well achieved. The discharged scum contains a large amount of water, which increases the workload of subsequent impurity treatment, resulting in a decrease in the overall efficiency of sewage treatment.

Summary of the invention

The invention provides a sewage treatment device to solve the technical problem in the prior art that when sewage is treated by an air flotation machine, the discharged scum contains a large amount of water, which increases the workload of subsequent impurity treatment.

In order to solve the above problems, the present invention provides a sewage treatment device adopting the following technical solutions:

It comprises a box body, in which a stirring tank, an air dissolving tank, a slag tank, a slag discharge tank and a wastewater tank are formed through a partition. A scraping mechanism is provided at the upper end of the slag tank, and a filter plate slag discharge mechanism for draining the slag in the slag tank is provided on one side of the partition between the slag tank and the slag discharge tank.

The filter plate slag discharge mechanism includes a filter plate, a driving mechanism for driving the filter plate to reciprocate up and down is provided on the side of the slag pool, a support shaft is provided on one side of the filter plate, and both ends of the support shaft are provided with a movable guide shaft, and the inner wall of the slag pool is provided with a guide groove matching the movable guide shaft, and the guide groove includes a vertically arranged straight groove and a rotating groove arranged at both ends of the straight groove, and the filter plate reciprocates up and down in the guide groove through the driving mechanism, and when the filter plate moves to the rotating groove at the upper end of the straight groove, the filter plate flips to a vertical state, and when the filter plate maintains the vertical state and moves from top to bottom to the rotating groove at the lower end of the straight groove, the filter plate flips to a horizontal state.

During the movement, the filter plate can be turned over according to the structural design of the guide groove. When the filter plate moves to the rotating groove at the upper end of the straight groove, it will turn over to a vertical state, so that the waste residue on the filter plate can be discharged into the slag discharge pool; and when it moves downward from top to bottom while maintaining a vertical state to the rotating groove at the lower end of the straight groove, it will turn over to a horizontal state. During the upward movement of the filter plate while maintaining a horizontal state, it is convenient to pick up the floating residue and drain it.

Through effective slag treatment and discharge, the water content in the waste slag is reduced and the energy consumption of subsequent waste slag treatment is reduced.

Furthermore, the straight groove includes two grooves arranged in parallel with each other, the rotating groove includes an arc groove arranged between the ends of the two grooves and used to connect the two grooves, and an inclined guide block matching the arc groove is provided between the two grooves near the arc groove.

The movable guide shafts at both ends of the support shaft are two that match the guide grooves.

The structure of the guide groove can ensure the smoothness and accuracy of the movement of the filter plate.

The design of the rotating trough allows the filter plate to be accurately turned over when it reaches the upper and lower ends of the straight trough. The use of the arc trough and the inclined guide block provides a smooth transition for the flipping of the filter plate, ensuring that the filter plate can be accurately flipped from a horizontal state to a vertical state, or from a vertical state to a horizontal state.

Furthermore, a slot corresponding to the inclined guide block is provided on the side wall of the scum pool, one end of the inclined guide block pointing to the slot extends into the slot, and a spring is provided between the bottom surface of the slot and the inclined guide block.

The coordinated design of the inclined guide block and the spring ensures that the inclined guide block can float along the axial direction of the spring relative to the side wall of the slag pool. On the one hand, it ensures that when the filter plate is flipped, the corresponding movable guide shaft can slide smoothly over the inclined guide block. On the other hand, when the filter plate moves vertically, there is no connection between the two grooves, thereby ensuring the stability of the vertical movement of the movable guide shaft.

Furthermore, the driving mechanism includes a vertical moving rod distributed at both ends of the support shaft, a transverse action rod is provided at the bottom end of the vertical moving rod, the transverse action rod is located between the corresponding two moving guide shafts, and the top end of the vertical moving rod is connected to the end of the telescopic rod fixed on the outer wall of the slag pool.

By placing the transverse action rod between the two movable guide shafts, the vertical movement of the vertical moving rod can be realized to drive the filter plate to move vertically. The structure is simple and the use flexibility is strong.

Furthermore, the scraping mechanism includes a driving shaft and a driven shaft rotatably arranged at the upper port of the slag pool, the driving shaft and the driven shaft are spaced apart in the front and rear, and sprockets are provided at both ends of the driving shaft and the driven shaft, and a conveying chain connected by a sprocket transmission is provided between the ends of the driving shaft and the driven shaft, and a slag plate assembly is provided between the two conveying chains.

The slag plate assembly comprises a plate seat fixed on the surface of the conveying chain, a shifting plate is slidably arranged in the plate seat, and when the slag plate assembly moves with the conveying chain to point to the slag pool, the shifting plate in the plate seat extends downward out of the plate seat.

The paddle plate and the plate seat are slidably matched. When the paddle plate moves the scum out of the scum pool with the conveyor chain, the paddle plate can be retracted into the plate seat. The scum attached to the side of the paddle plate can be scraped off by the plate seat when it is retracted into the plate seat. The self-cleaning function of the scum plate assembly reduces the maintenance cost of the equipment and improves the reliability of the equipment.

Furthermore, both sides of the plate seat are provided with elongated grooves, both ends of the shifting plate are provided with guide rods extending out of the elongated grooves, and the side walls of the scum pool are provided with sliding grooves cooperating with the guide rods.

The cooperation between the chute and the guide rod on the side wall of the scum pool provides a precise positioning function for the paddle. When the scum paddle assembly moves with the conveyor chain, the guide rod ensures that the paddle extends and retracts in the correct position according to the guidance of the chute, and smoothly completes the paddle and self-cleaning of the scum.

Furthermore, a scraper is provided above the slag pool and the slag discharge pool, and the scraper includes a scraping blade, and the scraping blade is used to scrape off the residue on the end surface of the slag plate assembly away from the end of the conveying chain.

Furthermore, a slag collecting plate with a V-shaped cross section is provided in the slag discharge pool, and a slag discharge port is provided on one side of the slag discharge pool, and the slag discharge port is opposite to one end of the bottom of the slag collecting plate.

The beneficial effects of a sewage treatment device provided by the present invention are as follows: the filter plate slag discharge mechanism reduces the water content in the waste slag and reduces the energy consumption of subsequent waste slag treatment through effective slag treatment and discharge; in addition, the slag plate assembly includes a sliding-matched slag plate and a plate seat, which can smoothly complete the slag removal while realizing a self-cleaning function, thereby improving the reliability of the equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

FIG1 is a schematic structural diagram of a sewage treatment device according to the present invention;

FIG2 is a front cross-sectional view of the sewage treatment device of the present invention;

FIG3 is a partial enlarged view of area A in FIG2 ;

FIG4 is a schematic diagram of a partial structure of a guide groove in the present invention;

5 is a schematic diagram of the cooperation between the filter plate slag discharge mechanism and the vertical moving rod and the transverse action rod in the present invention;

FIG6 is a partial structural schematic diagram of a sectional view of a sewage treatment device according to the present invention;

FIG7 is a partial enlarged view of area B in FIG6 ;

FIG8 is a schematic diagram of the process of the filter plate moving in the guide groove in the present invention;

FIG9 is a schematic diagram of a partial structure of a slag removal plate assembly in the present invention;

10 is a schematic diagram of the right end structure of the scraping mechanism in the present invention and the cooperation with the scraper;

FIG. 11 is a schematic structural diagram of the left end portion of the scraping mechanism of the present invention.

Description of reference numerals:

1. Box; 11. Mixing tank; 12. Dissolving gas tank; 13. Scum tank; 131. Guide groove; 1311. Straight groove; 1312. Rotating groove; 1313. Channel; 1314. Arc groove; 1315. Inclined guide block; 132. Vertical moving rod; 133. Horizontal action rod; 134. Telescopic rod; 135. Slide; 14. Slag discharge tank; 141. Slag collecting plate; 142 , slag discharge port; 15, wastewater tank; 16, scraper; 161, scraper blade; 17, spring; 2, scraping mechanism; 21, active rotating shaft; 22, driven rotating shaft; 23, slag plate assembly; 231, plate seat; 2311, elongated groove; 232, paddle plate; 2321, guide rod; 24, conveyor chain; 3, filter plate slag discharge mechanism; 31, filter plate; 32, support shaft; 33, movable guide shaft.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

An embodiment of a sewage treatment device provided by the present invention:

As shown in Figures 1 to 11, the sewage treatment device includes a housing 1, in which a stirring tank 11, an air dissolving tank 12, a slag tank 13, a slag discharge tank 14 and a wastewater tank 15 are formed by partitions. A scraping mechanism 2 is provided at the upper end of the slag tank 13, and a filter plate slag discharge mechanism 3 for draining the slag in the slag tank 13 is provided on one side of the partition between the slag tank 13 and the slag discharge tank 14.

A stirring structure is provided in the stirring pool 11 , and a gap is formed between the partition between the stirring pool 11 and the dissolved gas pool 12 and the bottom surface of the box body 1 , so that the stirring pool 11 and the dissolved gas pool 12 are connected.

The upper end surface of the partition between the dissolved gas pool 12 and the slag pool 13 is located below the upper end of the box body 1. After bubbles are attached to the surface of the waste slag in the dissolved gas pool 12, they flow from above the partition between the dissolved gas pool 12 and the slag pool 13 into the slag pool 13.

In this embodiment, the filter plate slag discharge mechanism 3 includes a filter residue plate 31, and a driving mechanism for driving the filter residue plate 31 to reciprocate up and down is provided on the side of the slag pool 13. A support shaft 32 is provided on one side of the filter residue plate 31, and a movable guide shaft 33 is provided at both ends of the support shaft 32. The inner wall of the slag pool 13 is provided with a guide groove 131 that cooperates with the movable guide shaft 33. The guide groove 131 includes a vertically arranged straight groove 1311 and a rotating groove 1312 arranged at both ends of the straight groove 1311, and the rotating grooves 1312 at both ends of the straight groove 1311 are symmetrically distributed.

The filter residue plate 31 moves back and forth up and down in the guide groove 131 through the driving mechanism, and when the filter residue plate 31 moves to the rotating groove 1312 at the upper end of the straight groove 1311, the filter residue plate 31 flips to a vertical state. When the filter residue plate 31 maintains the vertical state and moves from top to bottom to the rotating groove 1312 at the lower end of the straight groove 1311, the filter residue plate 31 flips to a horizontal state.

Among them, the straight groove 1311 includes two grooves 1313 arranged in parallel with each other, the rotating groove 1312 includes an arc groove 1314 arranged between the ends of the two grooves 1313 and used to connect the two grooves 1313, and an inclined guide block 1315 matching the arc groove 1314 is provided between the two grooves 1313 near the arc groove 1314.

The two movable guide shafts 33 at both ends of the support shaft 32 are matched with the guide grooves 131 .

When the filter plate 31 moves vertically in the two grooves 1313 of the straight groove 1311 , the two moving guide shafts 33 are respectively arranged in the two grooves 1313 and driven to move vertically by the driving mechanism.

When the filter residue plate 31 moves from bottom to top in the straight groove 1311, the filter residue plate 31 is in a horizontal state. When the horizontal filter residue plate 31 moves vertically to the upper end, the scum on the water surface is picked up and drained. When the filter residue plate 31 continues to move to the top of the straight groove 1311, as shown in Figure 8, the movable guide shaft 33 in the left groove 1313 enters the arc groove 1314 when it continues to move upward. Under the guidance of the arc groove 1314, the filter residue plate 31 is driven to gradually turn clockwise to a vertical state. At the same time, the movable guide shaft 33 in the right groove 1313 slides from the corresponding inclined guide block 1315. When the movable guide shaft 33 in the left groove 1313 moves to the upper end of the right groove 1313 through the arc groove 1314, the movable guide shaft 33 in the right groove 1313 moves to the left groove 1313 through the inclined guide block 1315.

When the filter plate 31 moves from top to bottom in the straight groove 1311, the filter plate 31 remains in a vertical state. During the movement, the scum remaining on the side of the filter plate 31 will be scraped off with the assistance of the partition between the scum pool 13 and the slag discharge pool 14.

The upper end surface of the partition between the slag pool 13 and the slag discharge pool 14 is wedge-shaped.

When the filter residue plate 31 remains in a vertical state and continues to move downward to the bottom end of the straight groove 1311, as shown in Figure 8, at this time, the movable guide shaft 33 in the left groove 1313 enters the arc groove 1314 at the lower end when continuing to move downward, and under the guiding action of the arc groove 1314, the filter residue plate 31 is driven to gradually flip counterclockwise to a horizontal state. At the same time, the movable guide shaft 33 in the right groove 1313 slides from the corresponding inclined guide block 1315, and when the movable guide shaft 33 in the left groove 1313 moves to the upper end of the right groove 1313 through the arc groove 1314, the movable guide shaft 33 in the right groove 1313 moves to the left groove 1313 through the inclined guide block 1315, and finally completes the flipping of the filter residue plate 31.

During the movement, the filter plate 31 can be turned over according to the structural design of the guide groove 131. When the filter plate 31 moves to the rotating groove 1312 at the upper end of the straight groove 1311, it will turn over to a vertical state, so that the waste residue on the filter plate 31 can be discharged into the slag discharge pool 14; and when it moves downward from top to bottom while maintaining the vertical state to the rotating groove 1312 at the lower end of the straight groove 1311, it will turn over to a horizontal state. During the upward movement of the filter plate 31 while maintaining the horizontal state, it is convenient to pick up the floating residue and drain it.

Through effective slag treatment and discharge, the water content in the waste slag is reduced and the energy consumption of subsequent waste slag treatment is reduced.

The structure of the guide groove 131 can ensure the stability and accuracy of the movement of the filter plate 31.

The design of the rotating groove 1312 allows the filter plate 31 to be accurately turned over when reaching the upper and lower ends of the straight groove 1311. The coordinated use of the arc groove 1314 and the inclined guide block 1315 provides a smooth transition for the turning of the filter plate 31, ensuring that the filter plate 31 can be accurately turned over from a horizontal state to a vertical state, or from a vertical state to a horizontal state.

In this embodiment, a slot corresponding to the inclined guide block 1315 is provided on the side wall of the slag pool 13 , and one end of the inclined guide block 1315 pointing to the slot extends into the slot, and a spring 17 is provided between the bottom surface of the slot and the inclined guide block 1315 .

Specifically, as shown in FIG. 4 , the outer end surface of the inclined guide block 1315 gradually slopes downward from left to right as a whole.

By cooperating with the design of the inclined guide block 1315 and the spring 17, it is ensured that the inclined guide block 1315 can float along the axial direction of the spring 17 relative to the side wall of the slag pool 13. On the one hand, it is ensured that when the filter plate 31 is flipped, the corresponding movable guide shaft 33 can slide smoothly over the inclined guide block 1315. On the other hand, when the filter plate 31 moves vertically, there is no connection between the two grooves 1313, thereby ensuring the stability of the vertical movement of the movable guide shaft 33.

In this embodiment, the driving mechanism includes a vertical moving rod 132 distributed at both ends of the support shaft 32, and a transverse action rod 133 is provided at the bottom end of the vertical moving rod 132. The transverse action rod 133 is located between the corresponding two moving guide shafts 33, and the top end of the vertical moving rod 132 is connected to the end of a telescopic rod 134 fixed on the outer wall of the slag pool 13.

By locating the lateral action rod 133 between the two moving guide shafts 33, the vertical movement of the vertical moving rod 132 can be realized to drive the filter plate 31 to move vertically. The structure is simple and the use flexibility is strong.

Specifically, the telescopic rod 134 is a cylinder.

In this embodiment, the scraping mechanism 2 includes a driving shaft 21 and a driven shaft 22 which are rotatably arranged at the upper end of the scum pool 13. The driving shaft 21 and the driven shaft 22 are spaced apart from each other in the front and rear direction, and sprockets are provided at both ends of the driving shaft 21 and the driven shaft 22. A conveying chain 24 connected by a sprocket transmission is provided between the ends of the driving shaft 21 and the driven shaft 22, and a slag plate assembly 23 is provided between the two conveying chains 24.

The slag plate assembly 23 includes a plate seat 231 fixed to the surface of the conveyor chain 24, and a plate 232 is slidably provided in the plate seat 231. When the slag plate assembly 23 moves with the conveyor chain 24 to point to the slag pool 13, the plate 232 in the plate seat 231 extends downward out of the plate seat 231.

Among them, the active rotating shaft 21 and the driven rotating shaft 22 are rotatably supported at the upper end of the scum pool 13, and a motor for driving the active rotating shaft 21 to rotate is fixedly provided outside the scum pool 13. As the conveyor chain 24 moves, the slag plate assembly 23 on the conveyor chain 24 will move accordingly.

Both sides of the plate seat 231 are provided with elongated grooves 2311 , both ends of the shifting plate 232 are provided with guide rods 2321 extending out of the elongated grooves 2311 , and the side wall of the scum pool 13 is provided with a sliding groove 135 matched with the guide rods 2321 .

The paddle plate 232 is slidably matched with the plate seat 231. As shown in FIG11 , the conveyor chain 24 rotates counterclockwise. When the slag paddle plate assembly 23 moves to the left end and points to the slag pool 13, the structure of the chute 135 has a descending section at the left end, so that the paddle plate 232 slides out of the plate seat 231 under the action of gravity. At this time, the paddle plate 232 plays the role of prying slag and pushes the slag toward the filter plate slag discharge mechanism 3.

As shown in FIG. 10 , when the shifting plate 232 extending out of the plate seat 231 moves to the right end, the shifting plate 232 is gradually retracted into the plate seat 231 under the action of the slide groove 135 because the structure of the slide groove 135 has an arc guide section at the right end.

When the paddle plate 232 is retracted into the plate seat 231, the scum attached to the side of the paddle plate 232 can be scraped off by the plate seat 231. The self-cleaning function of the scum plate assembly 23 reduces the maintenance cost of the equipment and improves the reliability of the equipment.

The cooperation between the chute 135 on the side wall of the scum pool 13 and the guide rod 2321 provides a precise positioning function for the paddle 232. When the scum paddle assembly 23 moves with the conveyor chain 24, the guide rod 2321 ensures that the paddle 232 extends and retracts at the correct position according to the guidance of the chute 135, and smoothly completes the paddle and self-cleaning of the scum.

In this embodiment, a scraper 16 is provided above the slag pool 13 and the slag discharge pool 14 . The scraper 16 includes a scraping blade 161 . The scraping blade 161 is used to scrape off the residue on the end surface of the slag plate assembly 23 away from the conveying chain 24 .

As shown in FIG. 11 , after the prying plate 232 is retracted into the plate seat 231 and passes through the scraper 16 , the scum attached to the bottom end surface of the slag prying plate assembly 23 will be scraped off with the assistance of the scraping blade 161 .

In this embodiment, a slag collecting plate 141 with a V-shaped cross section is provided in the slag discharge pool 14 , and a slag discharge port 142 is provided on one side of the slag discharge pool 14 . The slag discharge port 142 is opposite to a bottom end of the slag collecting plate 141 .

During specific use, the sewage to be treated is injected into the stirring tank 11 and a flocculant is added into the stirring tank 11. After the flocculant is added and stirred, flocs are generated in the sewage, and the flocs enter the dissolved air tank 12 from the stirring tank 11. A large number of highly dispersed microbubbles are introduced into the dissolved air tank 12, so that the suspended flocs adhere to the microbubbles and float to the water surface with the bubbles to form scum. The scum enters the scum tank 13 with the water flow, and the scum is pushed to the filter plate scum discharge mechanism 3 by the scraping mechanism 2, and then drained through the filter plate scum discharge mechanism 3, and the drained scum is discharged into the scum discharge tank 14, and discharged to the outside through the scum discharge tank 14.

A pipe connected to the lower part of the scum pool 13 is provided in the wastewater pool 15 to lead the wastewater in the scum pool 13 to the wastewater pool 15 . A drainage pipe is provided on one side of the bottom of the wastewater pool 15 .

According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims (8)

1. The sewage treatment device comprises a box body (1), wherein a stirring tank (11), a dissolved air tank (12), a scum tank (13), a slag discharging tank (14) and a wastewater tank (15) are formed in the box body (1) through a partition plate, and a scraping mechanism (2) is arranged at the upper end of the scum tank (13), and is characterized in that a filter plate slag discharging mechanism (3) for draining scum in the scum tank (13) is arranged at one side of the partition plate between the scum tank (13) and the slag discharging tank (14);

The filter plate slag discharging mechanism (3) comprises a slag filtering plate (31), a driving mechanism for driving the slag filtering plate (31) to reciprocate up and down is arranged on the side face of the slag pool (13), a support shaft (32) is arranged on one side of the slag filtering plate (31), moving guide shafts (33) are arranged at two ends of the support shaft (32), guide grooves (131) matched with the moving guide shafts (33) are arranged on the inner wall of the slag pool (13), the guide grooves (131) comprise vertically arranged straight grooves (1311) and rotating grooves (1312) arranged at two ends of the straight grooves (1311), the slag filtering plate (31) reciprocates up and down in the guide grooves (131) through the driving mechanism, and when the slag filtering plate (31) moves to the rotating grooves (1312) at the upper end of the straight grooves (1311), the slag filtering plate (31) is turned to be in a vertical state, and when the slag filtering plate (31) is kept in a vertical state and moves to the rotating grooves (1312) at the lower end of the straight grooves (1311) downwards, the slag filtering plate (31) is turned to be in a horizontal state.

2. The sewage treatment device according to claim 1, wherein the straight channel (1311) comprises two channels (1313) arranged in parallel at intervals, the rotary channel (1312) comprises an arc-shaped channel (1314) arranged between the ends of the two channels (1313) and used for communicating the two channels (1313), and an inclined guide block (1315) matched with the arc-shaped channel (1314) is arranged between the two channels (1313) near the arc-shaped channel (1314);

The movable guide shafts (33) at both ends of the support shaft (32) are two which are matched with the guide grooves (131).

3. The sewage treatment device according to claim 2, wherein a notch which is matched with the inclined guide block (1315) relatively is arranged on the side wall of the scum pool (13), one end of the inclined guide block (1315) pointing to the notch extends into the notch, and a spring (17) is arranged between the bottom surface of the notch and the inclined guide block (1315).

4. The sewage treatment device according to claim 2, wherein the driving mechanism comprises vertical moving rods (132) distributed at two ends of the supporting shaft (32), a transverse acting rod (133) is arranged at the bottom end of the vertical moving rods (132), the transverse acting rod (133) is positioned between two corresponding moving guide shafts (33), and the top end of the vertical moving rod (132) is connected with the end part of a telescopic rod (134) fixed on the outer wall of the slag pool (13).

5. The sewage treatment device according to any one of claims 1 to 4, wherein the scraping mechanism (2) comprises a driving rotating shaft (21) and a driven rotating shaft (22) which are rotatably arranged at an upper port of the slag pool (13), the driving rotating shaft (21) and the driven rotating shaft (22) are arranged at intervals in the front-back direction, chain wheels are arranged at two ends of the driving rotating shaft (21) and the driven rotating shaft (22), a conveying chain (24) connected through chain wheel transmission is arranged between the ends of the driving rotating shaft (21) and the driven rotating shaft (22), and slag poking plate assemblies (23) are arranged between the two conveying chains (24) at intervals;

the slag stirring plate assembly (23) comprises a plate seat (231) fixed on the surface of the conveying chain (24), a stirring plate (232) is arranged in the plate seat (231) in a sliding mode, and when the slag stirring plate assembly (23) moves to be directed to the slag floating pond (13) along with the conveying chain (24), the stirring plate (232) in the plate seat (231) stretches out of the plate seat (231) downwards.

6. The sewage treatment device according to claim 5, wherein both sides of the plate seat (231) are provided with elongated grooves (2311), both ends of the pulling plate (232) are provided with guide rods (2321) extending out of the elongated grooves (2311), and sliding grooves (135) matched with the guide rods (2321) are formed in the side walls of the scum pool (13).

7. The sewage treatment device according to claim 5, wherein a scraper blade (16) is arranged above the scum pool (13) and the slag discharge pool (14), the scraper blade (16) comprises a scraping edge (161), and the scraping edge (161) is used for scraping residues on the end face of the scum plate assembly (23) far away from one end of the conveying chain (24).

8. The sewage treatment device according to claim 1, wherein a slag collecting plate (141) with a V-shaped cross section is arranged in the slag discharging pool (14), a slag discharging port (142) is arranged at one side of the slag discharging pool (14), and the slag discharging port (142) is opposite to one end of the bottom of the slag collecting plate (141).