A sewage treatment system and a sewage treatment method

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a sewage treatment system and a sewage treatment method. The sewage treatment system includes a housing, on which a sewage treatment device is provided. An inlet pipe and an outlet pipe are provided on the sewage treatment device, and valve mechanisms are provided on both the inlet pipe and the outlet pipe to control their opening and closing. The valve mechanism includes two valve grooves, which are respectively formed on the inlet pipe and the outlet pipe. Valve plates are slidably arranged in both of the two valve grooves. A driving mechanism is provided on the housing to respectively drive the two valve mechanisms to operate. The driving mechanism includes a motor arranged on the housing, a first lead screw is arranged on the motor, and a second lead screw is rotatably arranged on the housing. The sewage treatment system and the sewage treatment method, through the setting of the driving mechanism, enable the traditional valve mechanism composed of the valve groove and the valve plate to automatically cooperate to control the opening and closing of the inlet pipe and the outlet pipe for the convenience of sewage treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically relates to a sewage treatment system and a sewage treatment method. Background Art

[0002] Sewage treatment refers to the process of purifying sewage to meet the water quality requirements for discharging into a certain water body or for reuse. Sewage treatment is widely applied in various fields such as construction, agriculture, transportation, energy, petrochemical industry, environmental protection, urban landscape, medical treatment, and catering. Classified by the source of sewage, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage, and medical sewage, etc., while domestic sewage is the sewage generated in daily life, which refers to a complex mixture of various forms of inorganic and organic substances. There are many methods for treating sewage, which can generally be classified into physical methods, chemical methods, and biological methods.

[0003] For existing various sewage treatment devices, the opening and closing of their inlet pipes and outlet pipes are controlled by mechanical valves instead of solenoid valves. Such valves lack an intelligent control opening and closing device to control the coordinated opening and closing of the inlet pipe and the outlet pipe for the convenience of sewage treatment. Summary of the Invention

[0004] The present invention provides a sewage treatment system and a sewage treatment method, which have the beneficial effect of enabling the coordinated opening and closing of the inlet pipe and the outlet pipe through the setting of a transmission structure to drive the forward and reverse rotation of the motor, so as to improve the sewage treatment efficiency, and solve the problem mentioned in the above background art that for existing various sewage treatment devices, the opening and closing of their inlet pipes and outlet pipes are controlled by mechanical valves instead of solenoid valves, and such valves lack an intelligent control opening and closing device to control the coordinated opening and closing of the inlet pipe and the outlet pipe for the convenience of sewage treatment.

[0005] The present invention provides the following technical solution: A sewage treatment system includes a housing, a sewage treatment device is arranged on the housing, an inlet pipe and an outlet pipe are arranged on the sewage treatment device, and valve mechanisms are arranged on both the inlet pipe and the outlet pipe to control their opening and closing;

[0006] The valve mechanism includes two valve grooves, the two valve grooves are respectively opened on the inlet pipe and the outlet pipe, and valve plates are slidably arranged in the two valve grooves;

[0007] A driving mechanism is arranged on the housing to respectively drive the two valve mechanisms to operate. The driving mechanism includes a motor arranged on the housing, a first lead screw is arranged on the motor, a second lead screw is rotatably arranged on the housing, and the two valve plates are respectively threadedly connected to the first lead screw and the second lead screw.

[0008] As an alternative solution of the sewage treatment system described in the present invention, wherein: the driving mechanism further includes a first gear disposed on the second lead screw, a first rack is slidably disposed on the housing, a connecting plate is disposed on the first rack, a second rack is disposed on the connecting plate, and the second rack meshes with the first gear.

[0009] As an alternative solution of the sewage treatment system described in the present invention, wherein: the driving mechanism further includes a first rotating rod rotatably disposed on the sewage treatment device, a second gear is disposed on the first rotating rod, and the second gear meshes with the first rack.

[0010] As an alternative solution of the sewage treatment system described in the present invention, wherein: the driving mechanism further includes a limiting block disposed on the first rack, a limiting groove is formed on the housing, and the limiting block is slidably disposed in the limiting groove.

[0011] As an alternative solution of the sewage treatment system described in the present invention, wherein: the driving mechanism further includes a third gear disposed on the first lead screw, a second rotating rod is rotatably disposed on the housing, a fourth gear is disposed on the second rotating rod, and the fourth gear meshes with the third gear, and the second rotating rod is connected to the first rotating rod.

[0012] As an alternative solution of the sewage treatment system described in the present invention, wherein: the driving mechanism further includes a ratchet disposed on the second rotating rod, a connecting disk is disposed on the first rotating rod, a pawl is rotatably disposed on the connecting disk, and the pawl meshes with the ratchet, and a spring piece is disposed on the connecting disk.

[0013] As an alternative solution of the sewage treatment system described in the present invention, wherein: a filtering mechanism is disposed in the sewage treatment device, and the filtering mechanism includes a filtering pipeline and a filter plate disposed on the sewage treatment device.

[0014] As an alternative solution of the sewage treatment system described in the present invention, wherein: the filtering mechanism further includes a connecting member slidably disposed on the sewage treatment device, and the connecting member is connected to the first rack, a fixed pushing plate is movably hinged on the connecting member through a hinge shaft, and two movable pushing plates are slidably disposed on the fixed pushing plate.

[0015] As an alternative solution of the sewage treatment system described in the present invention, wherein: the filtering mechanism further includes two springs, one ends of the two springs are respectively connected to the two movable pushing plates, and the other ends of the two springs are both connected to the fixed pushing plate.

[0016] The present invention also provides the following technical solution: a sewage treatment method for a sewage treatment system, including the following steps:

[0017] S1. First, when the sewage is not injected into the sewage treatment device, the inlet pipe is in a closed state, and the outlet pipe is in an open state. At this time, the motor rotates to drive the first lead screw to rotate, and the first lead screw then drives the valve plate located in the inlet pipe to displace and open the inlet pipe. At the same time, the valve plate located in the outlet pipe displaces in the opposite direction to close the outlet pipe. Then, the sewage is injected into the sewage treatment device through the inlet pipe;

[0018] S2. When the sewage is injected, some impurities with larger particles will first pass through the filter plate. After the sewage injection is completed, the motor rotates in the reverse direction to drive the valve plate located in the inlet pipe to displace and close the inlet pipe, while the outlet pipe remains closed. Then, the sewage treatment device treats the sewage;

[0019] S3. After the sewage treatment is completed, the motor rotates to drive the inlet pipe and the outlet pipe to open, so that the filtered water is discharged through the outlet pipe. Then, the motor rotates in the reverse direction to drive the inlet pipe to close, and the device can be restored for the next sewage treatment. And during this process, as the connecting piece reciprocates with the first rack, it will drive the fixed push plate and the two movable push plates to discharge the impurities filtered on the filter plate through the filter pipe.

[0020] The present invention has the following beneficial effects:

[0021] 1. For this sewage treatment system and sewage treatment method, through the setting of the driving mechanism, the traditional valve mechanism composed of the valve groove and the valve plate can automatically cooperate to control the opening and closing of the inlet pipe and the outlet pipe for the convenience of sewage treatment. When the sewage does not enter the sewage treatment device, the inlet pipe is in a closed state, and the outlet pipe is in an open state. At this time, the motor rotates to open the inlet pipe for sewage injection, while the outlet pipe is closed. When the sewage injection is completed and sewage treatment is carried out, the motor rotates in the reverse direction to drive the inlet pipe to close, and the outlet pipe remains closed. When discharging the treated sewage, the motor rotates again to drive the inlet pipe to open, and the outlet pipe also opens for water supply and discharge. Then, the motor rotates in the reverse direction to close the inlet pipe, and the device can be restored for the next sewage treatment process.

[0022] 2. For this sewage treatment system and sewage treatment method, before the sewage enters the sewage treatment device for sewage treatment, the impurities with larger particles are first filtered by the filter plate, and the fixed push plate slides left and right along the surface of the filter plate to timely push the impurities into the filter pipe and discharge them to avoid blockage. The movable push plates are slidably installed in the front and rear end openings of the fixed push plate, and the two movable push plates are elastically connected to the fixed push plate through two springs, and the two springs are in a compressed state. Thus, when the fixed push plate reciprocates left and right, the two movable push plates will automatically expand and contract along the inner wall of the sewage treatment device, so as to push all the impurities on the circular filter plate into the filter pipe.

[0023] 3. In the sewage treatment system and the sewage treatment method, when the motor rotates forward and backward, through the one-way transmission setting of the ratchet wheel, the connecting disc, the pawl and the spring piece, the first rotating rod can only rotate in one direction. Through the intermittent meshing of the upper and lower teeth of the second gear and the first rack, the first rack can be driven to rotate reciprocally. Since the first rack is fixed to the connecting piece, the fixed push plate will make a reciprocating linear motion left and right under the drive of the motor. And to prevent sewage from being discharged along with the filter pipe, the filter pipe is set at a position higher than the filter plate, and the inner wall of the sewage treatment device near the filter pipe is set to be inclined upward. The fixed push plate is hinged to the connecting piece and can automatically rotate along with the inclined wall to push impurities into the filter pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is an exploded schematic diagram of the overall structure of the present invention.

[0026] Figure 3 It is a first partial exploded schematic diagram of the present invention.

[0027] Figure 4 It is a second partial exploded schematic diagram of the present invention.

[0028] Figure 5 It is a first internal structure schematic diagram of the present invention.

[0029] Figure 6 is Figure 5 a partial enlarged view of part A in

[0030] Figure 7 is Figure 5 a partial enlarged view of part B in

[0031] Figure 8 It is a second internal structure schematic diagram of the present invention.

[0032] In the figure: 1. Housing; 2. Sewage treatment device; 201. Inlet pipe; 202. Outlet pipe; 3. Valve mechanism; 301. Valve groove; 302. Valve plate; 4. Driving mechanism; 401. Motor; 402. First lead screw; 403. Second lead screw; 404. First gear; 405. First rack; 406. Connecting plate; 407. Second rack; 408. First rotating rod; 409. Second gear; 410. Limiting block; 411. Limiting groove; 412. Third gear; 413. Second rotating rod; 414. Fourth gear; 415. Ratchet; 416. Connecting disk; 417. Pawl; 418. Spring piece; 5. Filter mechanism; 501. Connecting piece; 502. Fixed push plate; 503. Movable push plate; 504. Spring; 505. Filter pipe; 506. Filter plate. Detailed implementation mode

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0034] To realize the coordinated opening and closing of the inlet pipe 201 and the outlet pipe 202, Embodiment 1 is proposed;

[0035] Please refer to Figures 1 - 8 , which includes a housing 1. A sewage treatment device 2 is arranged on the housing 1. An inlet pipe 201 and an outlet pipe 202 are arranged on the sewage treatment device 2. Valve mechanisms 3 are arranged on both the inlet pipe 201 and the outlet pipe 202 to control their opening and closing;

[0036] The valve mechanism 3 includes two valve grooves 301, which are respectively opened on the inlet pipe 201 and the outlet pipe 202. Valve plates 302 are slidably arranged in the two valve grooves 301;

[0037] A driving mechanism 4 is arranged on the housing 1 to drive the two valve mechanisms 3 to operate respectively. The driving mechanism 4 includes a motor 401 arranged on the housing 1. A first lead screw 402 is arranged on the motor 401. A second lead screw 403 is rotatably arranged on the housing 1. The two valve plates 302 are respectively threadedly connected to the first lead screw 402 and the second lead screw 403.

[0038] Among them, the sewage treatment device 2 is installed on the housing 1. The sewage treatment device 2 can be sewage treatment devices of various models. For example, the MA515 domestic sewage purification equipment is selected. The water inlet pipe 201 and the water outlet pipe 202 are installed on the sewage treatment device 2. Valve grooves 301 are provided on both the water inlet pipe 201 and the water outlet pipe 202. Valve plates 302 are slidably installed in the two valve grooves 301. By sliding the two valve plates 302 back and forth along the two valve grooves 301 respectively, the opening and closing of the water inlet pipe 201 and the water outlet pipe 202 can be controlled.

[0039] When sewage does not enter the sewage treatment device 2 through the water inlet pipe 201 for sewage treatment, the upper valve plate 302 is in a state of closing the water inlet pipe 201, and the lower valve plate 302 is in a state of opening the water inlet pipe 201.

[0040] A motor 401 is installed at the side end of the housing 1. A first lead screw 402 is coaxially fixed on the output shaft of the motor 401. The upper valve plate 302 is threadedly connected to the first lead screw 402, and the displacement of the valve plate 302 is realized through the limiting action of the valve groove 301. A second lead screw 403 is also rotatably installed at the side end of the housing 1. The lower valve plate 302 is threadedly connected to the second lead screw 403.

[0041] By operating the motor 401 to drive the first lead screw 402 to rotate, and driving the second lead screw 403 to rotate through transmission, the front and back displacements of the two valve plates 302 can be realized. Embodiment

[0042] In order to realize that the water inlet pipe 201 is opened and the water outlet pipe 202 is closed when injecting sewage, when the sewage injection is completed for sewage treatment, the water inlet pipe 201 is closed and the water outlet pipe 202 remains closed, and the water outlet pipe 202 is opened when discharging the filtered water, Embodiment 2 is proposed;

[0043] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 1 - 6 , the driving mechanism 4 further includes a first gear 404 arranged on the second lead screw 403. A first rack 405 is slidably arranged on the housing 1. A connecting plate 406 is arranged on the first rack 405. A second rack 407 is arranged on the connecting plate 406, and the second rack 407 meshes with the first gear 404;

[0044] The driving mechanism 4 further includes a first rotating rod 408 rotatably arranged on the sewage treatment device 2. A second gear 409 is arranged on the first rotating rod 408, and the second gear 409 meshes with the first rack 405;

[0045] The driving mechanism 4 further includes a limit block 410 disposed on the first rack 405. A limit groove 411 is formed on the housing 1, and the limit block 410 is slidably disposed in the limit groove 411;

[0046] The driving mechanism 4 further includes a third gear 412 disposed on the first lead screw 402. A second rotating rod 413 is rotatably disposed on the housing 1. A fourth gear 414 is disposed on the second rotating rod 413, and the fourth gear 414 meshes with the third gear 412. The second rotating rod 413 is connected to the first rotating rod 408;

[0047] The driving mechanism 4 further includes a ratchet 415 disposed on the second rotating rod 413. A connection disk 416 is disposed on the first rotating rod 408. A pawl 417 is rotatably disposed on the connection disk 416, and the pawl 417 meshes with the ratchet 415. A spring piece 418 is disposed on the connection disk 416.

[0048] Wherein, a third gear 412 is fixed on the surface of the first lead screw 402. A fourth gear 414 is rotatably installed between the motor 401 and the second lead screw 403 on the side end of the housing 1. The motor 401, the second rotating rod 413 and the second lead screw 403 are distributed in a vertical straight line. A fourth gear 414 is fixed on the surface of the second rotating rod 413. The fourth gear 414 meshes with the third gear 412, and the transmission ratio of the third gear 412 and the fourth gear 414 is 2:1.

[0049] A first rotating rod 408 is rotatably installed on the side end of the sewage treatment device 2. A connection disk 416 is coaxially fixed on the first rotating rod 408. A ratchet 415 is coaxially fixed on the second rotating rod 413. Two pawls 417 are rotatably installed on the connection disk 416. Both of the two pawls 417 mesh with the ratchet 415. Two spring pieces 418 are further installed on the side wall of the connection disk 416. The two pawls 417 are pressed against the ratchet 415 by the two spring pieces 418.

[0050] A second gear 409 is fixed on the surface of the first rotating rod 408. The second gear 409 is a semi-gear. A limit groove 411 is formed on the upper inner wall of the housing 1. A limit block 410 is slidably installed in the limit groove 411. Both the limit block 410 and the limit groove 411 are T-shaped. A first rack 405 is fixed at the lower end of the limit block 410. The first rack 405 is an annular rack, and straight teeth are distributed on its upper and lower inner walls.

[0051] A connection plate 406 is fixed at the lower end of the first rack 405. A second rack 407 is fixed at the lower end of the connection plate 406. A first gear 404 is fixed on the surface of the second lead screw 403. The first gear 404 meshes with the second rack 407.

[0052] First, the motor 401 runs, driving the first lead screw 402 and the third gear 412 to rotate, causing the upper valve plate 302 to move forward to open the water inlet pipe 201. At this time, the third gear 412 rotates a quarter of a turn, driving the second rotating rod 413 and the fourth gear 414 to rotate half a turn, and then driving the ratchet wheel 415 to rotate. At this time, the rotating direction of the ratchet wheel 415 is opposite to the direction of the teeth of the pawl 417, and the two are stuck. At this time, the connecting plate 416 and the first rotating rod 408 will rotate with the ratchet wheel 415. The first rotating rod 408 drives the second gear 409 to rotate, causing the first rack 405 to move to the left, and then driving the first gear 404 to rotate, causing the lower valve plate 302 to move backward to close the water outlet pipe 202.

[0053] Then, the motor 401 runs in the reverse direction. At this time, the rotating direction of the ratchet wheel 415 is in the same direction as the direction of the teeth of the pawl 417. The pawl 417 will be continuously toggled under the action of the spring piece 418, but it will not affect the rotation of the ratchet wheel 415, and it will not drive the connecting plate 416 and the first rotating rod 408 to rotate, and the water outlet pipe 202 remains closed.

[0054] When the motor 401 runs again to drive the upper valve plate 302 to move forward to open the water inlet pipe 201, the second rack 407 moves to the right, driving the lower valve plate 302 to move forward to open the water outlet pipe 202. Embodiment

[0055] To filter larger particulate impurities in the sewage and discharge them outside the sewage treatment device 2 in a timely manner, Embodiment 3 is proposed;

[0056] This embodiment is an improved description based on Embodiment 2. Specifically, please refer to Figures 1 - 8 , a filtering mechanism 5 is provided inside the sewage treatment device 2. The filtering mechanism 5 includes a filtering pipe 505 and a filter plate 506 provided on the sewage treatment device 2;

[0057] The filtering mechanism 5 further includes a connecting member 501 slidably provided on the sewage treatment device 2, and the connecting member 501 is connected to the first rack 405. A fixed push plate 502 is movably hinged to the connecting member 501 through a hinge shaft, and two movable push plates 503 are slidably provided on the fixed push plate 502;

[0058] The filtering mechanism 5 further includes two springs 504. One end of each of the two springs 504 is connected to one of the two movable push plates 503, and the other end of each of the two springs 504 is connected to the fixed push plate 502.

[0059] Among them, a filter plate 506 is fixed to the inner wall of the sewage treatment device 2. A filtering pipeline 505 is fixed to the upper side part of the filter plate 506 in the sewage treatment device 2. And the inner wall of the filter plate 506 in the sewage treatment device 2 facing the filtering pipeline 505 is arranged as an inclined wall. A connecting piece 501 is fixed to the side end of the first rack 405. The connecting piece 501 slides left and right along the sewage treatment device 2. A fixed push plate 502 is fixed to the left end of the connecting piece 501. Movable push plates 503 are slidably installed in the openings at the front and rear ends of the fixed push plate 502. And the two movable push plates 503 are respectively connected to the fixed push plate 502 through two springs 504. During the process of the connecting piece 501 reciprocating left and right along with the first rack 405, the two movable push plates 503 will automatically expand and contract under the elastic force of the two springs 504, and discharge the filtered impurities into the filtering pipeline 505 for discharging. Embodiment

[0060] The present invention also provides a sewage treatment method for a sewage treatment system;

[0061] Specifically, please refer to Figures 1 - 8 , including the following steps:

[0062] S1. First, when the sewage is not injected into the sewage treatment device 2, the water inlet pipeline 201 is in a closed state, and the water outlet pipeline 202 is in an open state. At this time, the motor 401 operates to drive the first lead screw 402 to rotate. The first lead screw 402 further drives the valve plate 302 located in the water inlet pipeline 201 to displace to open the water inlet pipeline 201. At the same time, the valve plate 302 located in the water outlet pipeline 202 displaces in the opposite direction to close the water outlet pipeline 202. Then, the sewage is injected into the sewage treatment device 2 through the water inlet pipeline 201;

[0063] S2. When the sewage is injected, some impurities with larger particles will first pass through the filtration of the filter plate 506. After the sewage injection is completed, the motor 401 operates in the reverse direction to drive the valve plate 302 located in the water inlet pipeline 201 to displace to close the water inlet pipeline 201, and the water outlet pipeline 202 remains closed. Then, the sewage treatment device 2 treats the sewage;

[0064] S3. After the sewage treatment is completed, the motor 401 operates to drive the water inlet pipeline 201 and the water outlet pipeline 202 to open, so that the filtered water is discharged through the water outlet pipeline 202. Then, the motor 401 operates in the reverse direction to drive the water inlet pipeline 201 to be closed, and the device can be restored for the next sewage treatment. And during this process, the connecting piece 501 reciprocates along with the first rack 405, which will drive the fixed push plate 502 and the two movable push plates 503 to discharge the impurities filtered on the filter plate 506 through the filtering pipeline 505.

[0065] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0066] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A sewage treatment system, characterized in that: It includes a housing (1), on which a sewage treatment device (2) is provided. An inlet pipe (201) and an outlet pipe (202) are provided on the sewage treatment device (2), and valve mechanisms (3) are provided on both the inlet pipe (201) and the outlet pipe (202) to control their opening and closing; the valve mechanism (3) includes two valve grooves (301), the two valve grooves (301) are respectively opened on the inlet pipe (201) and the outlet pipe (202), and valve plates (302) are slidably arranged in the two valve grooves (301); a driving mechanism (4) is provided on the housing (1) to drive the two valve mechanisms (3) to operate respectively; The driving mechanism (4) includes: a motor (401) provided on the housing (1), a first lead screw (402) is provided on the motor (401), a second lead screw (403) is rotatably provided on the housing (1), and the two valve plates (302) are respectively threadedly connected to the first lead screw (402) and the second lead screw (403); A first gear (404) provided on the second lead screw (403), a first rack (405) is slidably provided on the housing (1), a connecting plate (406) is provided on the first rack (405), a second rack (407) is provided on the connecting plate (406), and the second rack (407) meshes with the first gear (404); A first rotating rod (408) rotatably provided on the sewage treatment device (2), a second gear (409) is provided on the first rotating rod (408), and the second gear (409) meshes with the first rack (405); A limiting block (410) provided on the first rack (405), a limiting groove (411) is opened on the housing (1), and the limiting block (410) is slidably arranged in the limiting groove (411); A third gear (412) provided on the first lead screw (402), a second rotating rod (413) is rotatably provided on the housing (1), a fourth gear (414) is provided on the second rotating rod (413), the fourth gear (414) meshes with the third gear (412), and the second rotating rod (413) is connected to the first rotating rod (408); A ratchet wheel (415) provided on the second rotating rod (413), a connecting disc (416) is provided on the first rotating rod (408), a ratchet pawl (417) is rotatably provided on the connecting disc (416), the ratchet pawl (417) meshes with the ratchet wheel (415), and a spring piece (418) is provided on the connecting disc (416).

2. The sewage treatment system according to claim 1, characterized in that: A filtering mechanism (5) is provided in the sewage treatment device (2), and the filtering mechanism (5) includes a filtering pipe (505) and a filter plate (506) provided on the sewage treatment device (2).

3. The sewage treatment system according to claim 2, characterized in that: The filtering mechanism (5) further includes a connecting member (501) slidably disposed on the sewage treatment device (2), and the connecting member (501) is connected to the first rack (405). A fixed push plate (502) is movably hinged to the connecting member (501) through a hinge shaft, and two movable push plates (503) are slidably disposed on the fixed push plate (502).

4. The sewage treatment system according to claim 3, characterized in that: The filtering mechanism (5) further includes two springs (504). One ends of the two springs (504) are respectively connected to the two movable push plates (503), and the other ends of the two springs (504) are both connected to the fixed push plate (502).

5. The sewage treatment method of the sewage treatment system according to claim 4, characterized in that, It includes the following steps: S1. First, when sewage is not injected into the sewage treatment device (2), the water inlet pipe (201) is in a closed state, and the water outlet pipe (202) is in an open state. At this time, the motor (401) operates to drive the first lead screw (402) to rotate. The first lead screw (402) then drives the valve plate (302) located in the water inlet pipe (201) to displace to open the water inlet pipe (201). At the same time, the valve plate (302) located in the water outlet pipe (202) displaces in the opposite direction to close the water outlet pipe (202). Then, sewage is injected into the sewage treatment device (2) through the water inlet pipe (201). S2. When sewage is injected, some impurities with larger particles will first pass through the filter plate (506). After the sewage injection is completed, the motor (401) operates in the reverse direction to drive the valve plate (302) located in the water inlet pipe (201) to displace to close the water inlet pipe (201), and the water outlet pipe (202) remains closed. Then, the sewage treatment device (2) treats the sewage. S3. After the sewage treatment is completed, the motor (401) operates to drive the water inlet pipe (201) and the water outlet pipe (202) to open, so that the filtered water is discharged through the water outlet pipe (202). Then, the motor (401) operates in the reverse direction to drive the water inlet pipe (201) to close, and the system can be restored for the next sewage treatment. During this process, the connecting member (501) reciprocates with the first rack (405), which will drive the fixed push plate (502) and the two movable push plates (503) to discharge the impurities filtered on the filter plate (506) through the filter pipe (505).

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