CN209759264U - Multistage wastewater treatment device - Google Patents

Abstract

The utility model discloses a multistage effluent treatment plant, which comprises a base, the top of base has set gradually sedimentation tank, first box, chemical treatment mechanism from the back to the front, the water pump is installed on the top of sedimentation tank, the play water pipe of water pump extends into the inner chamber top of first box, the inner chamber top left side of first box is provided with biological stuffing box, the inner chamber front side bottom central point of first box puts and is provided with first motorised valve, the front end of first motorised valve extends into chemical treatment mechanism's inner chamber, chemical treatment mechanism's inner chamber front side bottom central point puts the spiro union and has the second motorised valve, the right side central point of base puts and installs the ARM platform. This multistage effluent treatment plant can be with chemical liquid medicine even spraying in waste water, and then make waste water and chemical liquid medicine fully contact, improves the waste water treatment effect, easy operation, and the practicality is strong, is applicable to extensive popularization.

Description

multistage wastewater treatment device

Technical Field

The utility model relates to a sewage treatment technical field specifically is a multistage effluent treatment plant.

Background

The wastewater treatment (wastewater treatment methods) is a wastewater treatment method which utilizes physical, chemical and biological methods to treat wastewater, purify the wastewater, reduce pollution, recycle and fully utilize water resources, the wastewater multi-stage treatment is divided into three steps of physical treatment, biological treatment and chemical treatment, the physical treatment is a wastewater treatment method which separates and recovers insoluble suspended pollutants (including oil films and oil beads) in the wastewater through physical action, the biological treatment is a wastewater treatment method which converts organic pollutants in a solution, colloid and fine suspended state in the wastewater into stable and harmless substances through the metabolism of microorganisms, the chemical treatment is a wastewater treatment method which separates, removes or converts dissolved and colloid pollutants in the wastewater into harmless substances through chemical reaction and mass transfer action, the existing multi-stage wastewater treatment device is used for performing chemical treatment on the wastewater, the chemical liquid medicine is directly poured into the wastewater to carry out chemical reaction, but because the container filled with the wastewater is large, the chemical liquid medicine cannot be uniformly distributed in the wastewater, partial wastewater chemical reaction is insufficient, the wastewater treatment effect is influenced, and therefore a multistage wastewater treatment device needs to be designed for solving the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multistage effluent treatment plant to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

A multi-stage wastewater treatment device comprises a base, wherein a sedimentation tank, a first box body and a chemical treatment mechanism are sequentially arranged at the top end of the base from back to front, the top end of the sedimentation tank is provided with a water pump, a water inlet end pipe of the water pump extends into the inner cavity of the sedimentation tank, a water outlet end water pipe of the water pump extends into the top end of the inner cavity of the first box body, a biological stuffing box is arranged on the left side of the top end of the inner cavity of the first box body, the top end of the biological stuffing box extends out of the upper surface of the first box body, a first electric valve is arranged at the center of the bottom end of the front side of the inner cavity of the first box body, the front end of the first electric valve extends into the inner cavity of the chemical treatment mechanism, the center of the bottom end of the front side of the inner cavity of the chemical treatment mechanism is screwed with a second electric valve, the right side central point of base puts and installs the ARM platform, ARM platform and water pump, first motorised valve and second motorised valve electric connection.

Preferably, the chemical treatment mechanism comprises a second box body, a slide rail, a first slide block, a flat pipe, a spray head, a water tank, a hose, a chute, a second slide block, a rack, a servo motor, a first gear, a first L-shaped block, a tooth block, a rotating shaft, a second gear, a first connecting rod, a second connecting rod, a deep water stirrer and a second L-shaped block; the bottom of second box and the top front side screwed connection of base, the inner chamber rear side and the first motorised valve spiro union of second box, the spiro union has the second motorised valve in the inner chamber front side bottom central point of second box, and the front surface of the front end extension department second box of second motorised valve, the slide rail that is bilateral symmetry is all installed along the fore-and-aft direction on both sides top around the second box, four the inner chamber outside of slide rail all pegs graft there is first slider, flat pipe is installed along the left and right directions to the inboard of first slider, the bottom of flat pipe has set gradually the shower nozzle along the left and right directions, the top of second box is provided with the water tank, the equal spiro union in both sides bottom has the one end of hose around the inner chamber of water tank, the other end of hose runs through the inner chamber top of second box and extends into the inner chamber of flat pipe.

Specifically, the top of second box has seted up the spout along controlling the direction, the inner chamber central point of spout puts and pegs graft and has had the second slider, the inner chamber bottom of spout is extended to the bottom of second slider, and the bottom central point of second slider puts and is provided with the rack along controlling the direction, the top rear side central point of second box puts and installs servo motor, servo motor and ARM platform electric connection, servo motor's output screw connection has the first gear with rack phase engagement, both sides left end all is provided with first L-shaped piece around the second slider, both sides left end all is provided with the second L-shaped piece around the second slider, the inner chamber top of second box rotates through the bearing and is connected with four pivots, four the pivot is rectangular arrangement, the outer wall bottom key-type connection of pivot has the second gear, two the inboard of first L-shaped piece and the outside of two second L-shaped pieces all seted up with the second gear phase engagement The bottom ends of the four rotating shafts are in interference fit with one end of a first connecting rod, the outer side of the bottom end of the first connecting rod is connected with a second connecting rod in a shaft mode, the outer side of the bottom end of the second connecting rod is connected with the top end of the flat pipe in a shaft mode, a deep water stirrer is installed in the center of the bottom end of the inner cavity of the second box body, and the deep water stirrer is electrically connected with the ARM platform.

Preferably, the distance between the inner wall of the second box body and the outer side of the sliding rail is larger than the length of the first connecting rod.

Preferably, the inner cavity of the slide rail is in a dovetail groove shape, and the first slide block is inserted into the inner cavity of the slide rail in a matching manner.

Preferably, the inner cavity of the sliding chute is in a dovetail groove shape, and the second sliding block is inserted into the inner cavity of the sliding chute in a matched mode.

preferably, the servo motor is positioned above the flat pipe.

compared with the prior art, the beneficial effects of the utility model are that: the multistage wastewater treatment device comprises a sedimentation tank, wastewater is sedimentated in the sedimentation tank, the sedimentated wastewater is pumped into a first box body by a water pump, the wastewater is decomposed by biological filler in a biological filler box and then enters a second box body, chemical liquid medicine in a water tank enters a flat pipe by a hose, a spray head atomizes the chemical liquid medicine, the spraying area of the chemical liquid medicine is increased, a first gear is driven by a servo motor to perform intermittent forward and backward rotation, a rack is driven to drive a second sliding block to move left and right under the action of the rotating force of the first gear due to the meshing of the first gear and the rack, the second sliding block drives a first L-shaped block and a second L-shaped block to move left and right, tooth blocks meshed with the second gear are arranged on the outer sides of the front and back two second L-shaped blocks and the inner side of the first L-shaped block, and the second gear drives a first connecting rod on the corresponding position to rotate towards the outer side or the, because first connecting rod and second connecting rod looks coupling, and second connecting rod and flat tub of looks coupling, and then make first connecting rod drive the second connecting rod to incline to the outside and fold or incline to the inboard and expand, and then make two flat tub of front and back to inboard and outside reciprocating motion, thereby when realizing waste water multi-stage treatment, can be with even spraying of chemical liquid medicine in waste water, and then make waste water and chemical liquid medicine fully contact, improve the waste water treatment effect, and is simple in operation, therefore, the clothes hanger is strong in practicability, and is suitable for extensive popularization.

Drawings

Fig. 1 is a schematic structural view of the present invention;

Fig. 2 is a right side sectional view of the present invention;

FIG. 3 is a right side cross-sectional view of the chemical treatment mechanism of the present invention;

FIG. 4 is a top cross-sectional view of the chemical processing mechanism of the present invention;

Fig. 5 is an enlarged view of the position a of the present invention.

In the figure: 1. the device comprises a base, 2, a sedimentation tank, 3, a first box body, 4, a chemical treatment mechanism, 401, a second box body, 402, a sliding rail, 403, a first sliding block, 404, a flat pipe, 405, a spray head, 406, a water tank, 407, a hose, 408, a sliding chute, 409, a second sliding block, 410, a rack, 411, a servo motor, 412, a first gear, 413, a first L-shaped block, 414, a tooth block, 415, a rotating shaft, 416, a second gear, 417, a first connecting rod, 418, a second connecting rod, 419, a deep water stirrer, 420, a second L-shaped block, 5, a water pump, 6, a biological filling box, 7, a first electric valve, 8, a second electric valve, 9 and an ARM platform.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: a multistage wastewater treatment device comprises a base 1, wherein a sedimentation tank 2, a first box body 3 and a chemical treatment mechanism 4 are sequentially arranged on the top end of the base 1 from back to front, a water pump 5 is installed on the top end of the sedimentation tank 2, a support is arranged at the bottom end of the water pump 5, the water pump 5 can be fixed on the top end of the sedimentation tank 2, workers can inject wastewater into the sedimentation tank 2 to stand and precipitate the wastewater, insoluble pollutants in the wastewater are further separated, a water inlet end water pipe of the water pump 5 extends into an inner cavity of the sedimentation tank 2, a water outlet end water pipe of the water pump 5 extends into the top end of the inner cavity of the first box body 3, a biological filler box 6 is arranged on the left side of the top end of the inner cavity of the first box body 3, the workers can previously place biological fillers in the biological filler box 6 to decompose organic pollutants in the wastewater through microbial metabolism, and the top end of the biological, a first electric valve 7 is arranged at the center of the bottom end of the front side of the inner cavity of the first box body 3, the front end of the first electric valve 7 extends into the inner cavity of the chemical treatment mechanism 4, a second electric valve 8 is screwed at the center of the bottom end of the front side of the inner cavity of the chemical treatment mechanism 4, an ARM platform 9 is arranged at the center of the right side of the base 1, and the ARM platform 9 is electrically connected with the water pump 5, the first electric valve 7 and the second electric valve 8;

The chemical treatment mechanism 4 comprises a second box body 401, a sliding rail 402, a first sliding block 403, a flat pipe 404, a spray head 405, a water tank 406, a hose 407, a sliding groove 408, a second sliding block 409, a rack 410, a servo motor 411, a first gear 412, a first L-shaped block 413, a tooth block 414, a rotating shaft 415, a second gear 416, a first connecting rod 417, a second connecting rod 418, a deep water stirrer 419 and a second L-shaped block 420;

The bottom end of the second box body 401 is connected with the front side screw at the top end of the base 1, the rear side of the inner cavity of the second box body 401 is connected with the first electric valve 7 in a screw mode, the center position of the bottom end of the front side of the inner cavity of the second box body 401 is connected with the second electric valve 8 in a screw mode, the front end of the second electric valve 8 extends to the front surface of the second box body 401, the first electric valve 7 and the second electric valve 8 can seal the second box body 401 and the first box body 3 to prevent waste water from mixing in different treatment stages and further influence the waste water treatment effect, slide rails 402 which are bilaterally symmetrical are arranged at the top ends of the front side and the rear side of the second box body 401 along the front-rear direction, first slide blocks 403 are inserted outside the inner cavities of the four slide rails 402, flat pipes 404 are arranged at the inner sides of the first slide blocks along the left-right direction, spray nozzles 405 are sequentially arranged at the bottom ends of the flat pipes 403 along the left, the other end of the hose 407 penetrates through the top end of the inner cavity of the second box 401 and extends into the inner cavity of the flat tube 404, a certain amount of chemical liquid medicine is filled into the water tank 406 by a worker, the chemical liquid medicine enters the flat tube 404 along the hose 407 and is atomized by the spray head 405, so that the spraying area of the chemical liquid medicine is increased, the top end of the second box 401 is provided with a chute 408 along the left-right direction, the center position of the inner cavity of the chute 408 is inserted with a second slider 409, the bottom end of the second slider 409 extends out of the bottom end of the inner cavity of the chute 408, a rack 410 is arranged at the center position of the bottom end of the second slider 409 along the left-right direction, a servo motor 411 is installed at the center position of the rear side of the top end of the second box 401, the servo motor 411 is electrically connected with the ARM platform 9, an output end screw of the servo motor 411 is connected with a first gear 412 meshed with, the rack 410 is promoted to drive the second sliding block 409 to reciprocate left and right under the action of the rotating force of the first gear 412, the left ends of the front side and the rear side of the second sliding block 409 are respectively provided with a first L-shaped block 413, the left ends of the front side and the rear side of the second sliding block 409 are respectively provided with a second L-shaped block 420, the top end of the inner cavity of the second box body 401 is rotatably connected with four rotating shafts 415 through bearings, the four rotating shafts 415 are arranged in a rectangular shape, the bottom end of the outer wall of each rotating shaft 415 is connected with a second gear 416 in a key mode, the inner sides of the two first L-shaped blocks 413 and the outer sides of the two second L-shaped blocks 420 are respectively provided with a tooth block 414 meshed with the second gear 416, the bottom ends of the four rotating shafts 415 are respectively in interference fit with one end of a first connecting rod 417, the outer side of the bottom end of the first connecting rod 417 is connected with a second connecting rod 418 in a shaft mode, the first L-shaped block 413 and the second L-shaped block 420 are prompted to drive the corresponding second gear 416 to rotate in opposite directions, so that the second gear 416 drives the first connecting rods 417 on corresponding positions to rotate through the rotating shaft 415, the four first connecting rods 417 are prompted to rotate towards the outer side and towards the inner side, the first connecting rods 417 drive the second connecting rods 418 to incline towards the outer side and fold or incline towards the inner side and unfold, the front flat pipe 404 and the rear flat pipe 404 are prompted to move back and forth, and therefore chemical liquid medicine can be uniformly sprayed in waste water, a deep water stirrer 419 is installed in the center of the bottom end of the inner cavity of the second box 401, and the deep water stirrer 419 is electrically connected with the ARM platform 9. It should be noted that the hose should be malleable, such as rubber bellows, or have a length variability that accommodates the length change that the flat tube causes to the hose as it moves.

It should be noted that the distance between the inner wall of the second casing 401 and the outer side of the sliding rail 402 is greater than the length of the first link 417, so as to avoid the first link 417 colliding with the inner wall of the second casing 401 during the outward rotation process. The inner cavity of the slide rail 402 is in a dovetail groove shape, and the first slider 403 is inserted into the inner cavity of the slide rail 402 in a matching manner, so that the first slider 403 slides back and forth in the inner cavity of the slide rail 402, and the flat pipe 404 is limited. The inner cavity of the sliding groove 408 is in a shape of a dovetail groove, and the second sliding block 409 is inserted into the inner cavity of the sliding groove 408 in a matching manner, so that the second sliding block 409 slides left and right in the inner cavity of the sliding groove 408 to limit the second sliding block 409. Servo motor 411 is located the top of flat pipe 404 to avoid flat pipe 404 to collide with servo motor 411 in the back and forth movement process.

the following electric devices have the following types and functions:

And (5) a water pump: the model is 150QJ0-50/7, the water pump 5 is connected with an external power supply, the external power supply is 380V alternating current, the water pump 5 is controlled by the ARM platform 9, and the water pump 5 can pump precipitated wastewater out of the sedimentation tank 2 and discharge the wastewater into the first box body 3;

ARM platform 9: the model is RTL-X1000, the ARM platform 9 is connected with an external power supply, the external power supply is 220V alternating current, and an operating system is arranged in the ARM platform 9 in advance and can control the water pump 5, the servo motor 411, the deep water stirrer 419, the first electric valve 7 and the second electric valve 8;

First electric valve 7 and second electric valve 8: the model is DN50, the first electric valve 7 and the second electric valve 8 are connected with an external power supply, the external power supply is 380V alternating current, and the first electric valve 7 and the second electric valve 8 are controlled by the ARM platform 9 to realize opening and closing;

The servo motor 411: the model of the servo motor is MR-J2S-10A, the servo motor 411 is a single-output-shaft forward and reverse rotation motor, the servo motor 411 is connected with an external power supply, the external power supply is 380V alternating current, and the servo motor 411 is controlled by an ARM platform 9 and can drive the first gear 412 to rotate;

The deep water stirrer 419: the model number of the deep water stirrer is QJB1.5/6-260/3-980/C, the deep water stirrer 419 is connected with an external power supply, the external power supply is 380V alternating current, and the deep water stirrer 419 is controlled by an ARM platform 9 and can stir the wastewater added with the chemical agent.

The detailed connection means is a technique known in the art, and the following mainly describes the working principle and process, and the specific operation is as follows.

when the device is used, a worker injects wastewater into the sedimentation tank 2 to make the wastewater stand and precipitate, and further separates out insoluble pollutants in the wastewater, the ARM platform 9 is controlled to control the water pump 5 to start, the water pump 5 pumps the precipitated wastewater out of the sedimentation tank 2 and discharges the wastewater into the first box body 3, the worker places biological fillers in the biological filler box 6 in advance, and further decomposes organic pollutants in the wastewater through microbial metabolism, after decomposition, the ARM platform 9 controls the first electric valve 7 to open, so that the wastewater enters the second box body 401 from the first electric valve 7, the worker fills a certain amount of chemical liquid medicine in the water tank 406 in advance, the chemical liquid medicine enters the flat pipe 404 along the hose 407 and is atomized by the nozzle 405, and further the spraying area is increased, the worker operates the ARM platform 9 to control the servo motor 411 to start and intermittently rotate forward and backward, the servo motor drives the first gear 412 to rotate counterclockwise when rotating backward, because the first gear 412 is meshed with the rack 410, under the limiting action of the sliding groove 408, the rack 410 is enabled to drive the second sliding block 409 to move towards the left side under the rotating force of the first gear 412, and the second sliding block 409 drives the first L-shaped block 413 and the second L-shaped block 420 to move towards the left side, because the outer sides of the front and rear second L-shaped blocks 420 are respectively provided with a tooth block 414 meshed with the front and rear second gears 416 at the right side, the second L-shaped block 420 is enabled to drive the front and rear second gears 416 at the right side to rotate towards opposite directions while moving towards the left side, so that the two second gears 416 at the right side drive the first connecting rods 417 at corresponding positions to rotate towards the right side through the rotating shaft 415, because the inner sides of the first L-shaped block 413 are respectively provided with tooth blocks 414 meshed with the front and rear second gears 416 at the left side, the first L-shaped block 413 is enabled to drive the two second gears 416 at the left side to rotate towards opposite, so that the two second gears 416 on the left side drive the first connecting rods 417 on the corresponding positions to rotate towards the left side through the rotating shaft 415, and thus the four first connecting rods 417 are all driven to rotate towards the outside, because the first connecting rods 417 are in shaft connection with the second connecting rods 418, and the second connecting rods 418 are in shaft connection with the flat pipes 404, further the first connecting rods 417 drive the second connecting rods 418 to tilt towards the outside and fold, and the two flat pipes 404 on the front and the back are driven to move towards the inside under the limiting action of the first sliding block 403, the servo motor 411 drives the first gear 412 to rotate clockwise when rotating forwards, so that the two second gears 416 on the front and the back on the right side drive the first connecting rods 417 on the corresponding positions to rotate towards the left side, the two second gears 416 on the front and the back on the left side drive the first connecting rods 417 on the corresponding positions to rotate towards the right side, so that the four first connecting rods 417 rotate towards the inside, ARM platform 9 control deep water mixer 419 starts, stir chemical liquid medicine and waste water, it is more abundant to make waste water and chemical liquid medicine contact, after waste water chemical treatment finishes, ARM platform 9 opens second motorised valve 8 and makes waste water follow second box 401 internal flow play, and then accomplish the multilevel processing of waste water, thereby when realizing waste water multilevel processing, can be with even spraying of chemical liquid medicine in waste water, and then make waste water and chemical liquid medicine fully contact, improve the wastewater treatment effect, and is simple in operation, therefore, the clothes hanger is strong in practicability, and is suitable for extensive popularization.

in the description of the present invention, it is to be understood that the terms "top end", "bottom end", "one end", "front side", "rear side", "other end", "upper", "lower", "outer", "inner", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated; also, unless expressly stated or limited otherwise, the terms "mounted," "journaled," "screwed," "interference fit," "disposed," and the like are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A multistage waste water treatment device, includes base (1), its characterized in that: the top end of the base (1) is sequentially provided with a sedimentation tank (2), a first box body (3) and a chemical treatment mechanism (4) from back to front, a water pump (5) is installed at the top end of the sedimentation tank (2), a water inlet end pipe of the water pump (5) extends into an inner cavity of the sedimentation tank (2), a water outlet end pipe of the water pump (5) extends into the top end of the inner cavity of the first box body (3), a biological stuffing box (6) is arranged on the left side of the top end of the inner cavity of the first box body (3), the top end of the biological stuffing box (6) extends out of the upper surface of the first box body (3), a first electric valve (7) is arranged at the center position of the bottom end of the front side of the inner cavity of the first box body (3), the front end of the first electric valve (7) extends into the inner cavity of the chemical treatment mechanism (4), a second electric valve (8) is screwed at the center position of the bottom end of the front side of the inner, the ARM platform (9) is electrically connected with the water pump (5), the first electric valve (7) and the second electric valve (8).

2. The multistage wastewater treatment device according to claim 1, wherein the chemical treatment mechanism (4) comprises a second box body (401), the bottom end of the second box body (401) is connected with the front side of the top end of the base (1) through a screw, the rear side of the inner cavity of the second box body (401) is in threaded connection with a first electric valve (7), the center position of the bottom end of the front side of the inner cavity of the second box body (401) is in threaded connection with a second electric valve (8), the front end of the second electric valve (8) extends to the front surface of the second box body (401), the top ends of the front side and the rear side of the second box body (401) are respectively provided with a slide rail (402) which is bilaterally symmetrical along the front-rear direction, the outer sides of the inner cavities of the four slide rails (402) are respectively inserted with a first slide block (403), the inner sides of the first slide blocks (403) are respectively provided with flat pipes (404) along the left-right, the top of second box (401) is provided with water tank (406), and the equal spiro union in both sides bottom has the one end of hose (407) around the inner chamber of water tank (406), and the other end of hose (407) runs through the inner chamber top of second box (401) and extends into the inner chamber of flat pipe (404).

3. The multistage wastewater treatment device according to claim 2, wherein a sliding groove (408) is formed in the top end of the second box body (401) along the left-right direction, a second sliding block (409) is inserted in the center position of an inner cavity of the sliding groove (408), the bottom end of the second sliding block (409) extends out of the bottom end of the inner cavity of the sliding groove (408), a rack (410) is arranged in the center position of the bottom end of the second sliding block (409) along the left-right direction, a servo motor (411) is installed in the center position of the rear side of the top end of the second box body (401), the servo motor (411) is electrically connected with the ARM platform (9), a first gear (412) meshed with the rack (410) is in screwed connection with the output end of the servo motor (411), first L-shaped blocks (413) are arranged at the left ends of the front side and the rear side of the second sliding block (409), second L-shaped blocks (420) are, the top end of the inner cavity of the second box body (401) is rotatably connected with four rotating shafts (415) through bearings, the rotating shafts (415) are arranged in a rectangular mode, the bottom end of the outer wall of each rotating shaft (415) is connected with a second gear (416), the inner side of each first L-shaped block (413) and the outer sides of two second L-shaped blocks (420) are provided with tooth blocks (414) meshed with the second gears (416), the bottom ends of the rotating shafts (415) are in interference fit with one ends of first connecting rods (417), the outer side of the bottom end of each first connecting rod (417) is connected with a second connecting rod (418) in a shaft mode, the outer side of the bottom end of each second connecting rod (418) is connected with the top end of the flat pipe (404) in a shaft mode, a deep water stirrer (419) is installed in the center position of the bottom end of the inner cavity of the second box body (401), and the deep water stirrer (.

4. The multi-stage wastewater treatment plant according to claim 2, characterized in that: the distance between the inner wall of the second box body (401) and the outer side of the sliding rail (402) is larger than the length of the first connecting rod (417).

5. The multi-stage wastewater treatment plant according to claim 2, characterized in that: the inner cavity of the sliding rail (402) is in a dovetail groove shape, and the first sliding block (403) is inserted into the inner cavity of the sliding rail (402) in a matched mode.

6. The multi-stage wastewater treatment plant according to claim 2, characterized in that: the inner cavity of the sliding groove (408) is in a dovetail groove shape, and the second sliding block (409) is in adaptive insertion connection with the inner cavity of the sliding groove (408).

7. a multi-stage wastewater treatment plant according to claim 3, characterized in that: the servo motor (411) is located above the flat pipe (404).