Multi-stage sewage treatment equipment and process

Abstract

The invention discloses multistage sewage treatment equipment and process, and relates to the technical field of sewage treatment.The multistage sewage treatment equipment comprises two first treatment ponds, a second treatment pond and a sedimentation pond, a pumping device is arranged on the second treatment pond, and a lifting device is arranged at the top of each first treatment pond; the bottom of each lifting device is connected with a grid plate separation structure through a connecting frame, and a shielding extension structure is arranged on the inner side wall of each first treatment pond. Large-particle solid impurities in the first treatment ponds are screened through the grid plate separation structures, so that the large-particle solid impurities are left above the grid plate separation structures; the gap between the grid plate separation structure and the inner side wall of the first treatment tank is sealed by the shielding extension structure, so that the sewage is prevented from directly crossing the grid plate separation structure without being treated, and the influence on the sewage treatment effect is avoided; the shielding extension structure is located outside the movement path of the grid plate separation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to multi-stage sewage treatment equipment and technology. Background Art

[0002] Wastewater treatment is to ensure that wastewater meets the water quality requirements for discharge into a water body or reuse. It generally includes industrial wastewater treatment and domestic wastewater treatment. Industrial wastewater includes industrial wastewater, agricultural wastewater, and medical wastewater. The treatment methods include physical, chemical, and biological methods.

[0003] The invention patent with the existing patent announcement number CN119118257B discloses a multi-stage potato starch wastewater treatment equipment, which is specifically designed and installed with a solid waste isolation mechanism and a solid waste discharge mechanism. After driving the lifting frame to rise, the movable grille is driven to rotate 180 degrees by the movement of the reciprocating box, so as to facilitate the discharge of solid waste accumulated on the movable grille into the isolation tank. When solid waste is being discharged in one isolation tank, the lifting frame in the other isolation tank is lowered, and then the solid waste in the potato starch wastewater is blocked by the lowered movable grille, so as to carry out a cycle, so that the equipment can continuously block the solid waste in the potato starch wastewater and automatically discharge the blocked materials.

[0004] However, this invention also has the following defects: when the grille moves in and out of the isolation tank, since the isolation tank is used for sewage treatment, a large amount of solid particulate impurities will be attached to the inner wall of the isolation tank. At this time, if there is a gap between the grille and the inner wall of the isolation tank, it is easy for the particulate impurities in the sewage to pass through the grille without being filtered by the grille, and enter the filter tank, affecting the effect of subsequent sewage treatment. If there is no gap between the grille and the inner wall of the isolation tank, the grille is easily stuck by the solid particulate impurities during movement, causing the grille to fail to rise and fall normally. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-stage sewage treatment equipment and process to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A multi-stage sewage treatment equipment, comprising two first treatment tanks, a second treatment tank and a sedimentation tank, wherein the two first treatment tanks are arranged in parallel and are both connected to a sewage pipe, the two first treatment tanks are both connected to the bottom of the second treatment tank, a pumping device is provided on the second treatment tank, the pumping device is used to pump the sewage in the second treatment tank to the sedimentation tank, a lifting device is provided on the top of each first treatment tank, each lifting device is connected to a grid separation structure for screening large particles of solid impurities, and when the grid separation structure is located in the corresponding first treatment tank, there is a gap between the grid separation structure and the inner wall of the first treatment tank, a shielding extension structure is provided on the inner side wall of each first treatment tank, and the shielding extension structure is used to close the gap between the grid separation structure and the inner wall of the first treatment tank, and moves outside the movement path of the grid separation structure when the grid separation structure moves up and down, and the two shielding extension structures are arranged at different heights in the two first treatment tanks; The second treatment tank is provided with a filtering structure, the sedimentation tank is provided with a heating device and a moving device, the moving device is provided with a scraping structure, and the scraping structure is used to scrape off impurities precipitated and solidified on the heating device.

[0007] As a preferred solution of the present invention, the lifting device includes a gear rotatably installed at the top edge of the first treatment tank through a support plate, the gear is engaged with a tooth plate, a lifting groove and a plurality of sliding grooves are opened on the top of the first treatment tank, and the tooth plate is slidably connected in the lifting groove, and the plurality of sliding grooves are symmetrically arranged on the top of the first treatment tank and are slidably connected to a lifting bracket, and the tooth plate is fixedly connected to one side of the lifting bracket.

[0008] As a preferred solution of the present invention, the grid separation structure includes a plurality of connecting rods fixedly connected to the bottom of the lifting bracket, the plurality of connecting rods are divided into two groups and are symmetrical about the central plane of the vertical direction of the first treatment tank, and each group of the connecting rods are arranged along a horizontal straight line, the bottoms of the two groups of connecting rods are movably connected to a grid for separating large-particle solid impurities, and the plurality of outer walls on the peripheral sides of the grid are respectively parallel to the plurality of vertical side walls in the first treatment tank, two positioning magnetic blocks are symmetrically arranged on the grid, and the two positioning magnetic blocks are respectively attracted to one of the two groups of connecting rods by magnetic force to limit the position of the grid.

[0009] As a preferred solution of the present invention, two sliding bars are symmetrically arranged on the grid plate, and movable grooves are opened on the opposite sides of the two groups of connecting rods. Each of the sliding bars is slidably connected to the movable groove on one group of connecting rods, and the two positioning magnetic blocks are respectively arranged on the top of the two sliding bars and are respectively attracted to the outermost side of each group of connecting rods.

[0010] As a preferred solution of the present invention, the upper surface of the grid plate is wavy.

[0011] As a preferred solution of the present invention, the shielding extension structure includes a plurality of winding assemblies and a plurality of shielding plates of the same height, and each of the winding assemblies is connected to the corresponding shielding plate by a connecting rope, a plurality of side walls in the first treatment tank are provided with winding grooves, and the plurality of winding assemblies are respectively arranged in the corresponding winding grooves, the plurality of shielding plates are respectively slidably and sealedly connected to the notches of the winding grooves, and can all be horizontally slid along the notches of the winding grooves to extend into the interior of the first treatment tank, and a spring connected to the inner wall of the winding groove is connected to the side of each shielding plate facing away from the interior of the first treatment tank; Wherein, after extending into the first treatment tank, the plurality of shielding plates are located above the gap between the grid plate and the inner wall of the first treatment tank, and the portions of the plurality of shielding plates located in the first treatment tank form an annular plate.

[0012] As a preferred solution of the present invention, a baffle is provided at the bottom of the shielding plate, and a plurality of isolation grooves cooperating with the baffles are provided on the grid plate. When the baffles contact each other, an annular bar is formed.

[0013] In order to solve the above technical problems, the present invention also provides a treatment process of a multi-stage sewage treatment equipment, the specific steps of which include: At step S100, one of the lifting devices transports the grid separation structure into the first treatment tank, and then the shield extension structure extends into the first treatment tank. The lifting device then controls the grid separation structure to move upward until it contacts the bottom of the shield extension structure. S200: Sewage is fed into the corresponding first treatment tank through the sewage pipe, and is separated from large solid impurities by the grid separation structure. The sewage after the first treatment enters the second treatment tank; At step S300, the sewage in the second treatment tank gradually rises and passes through the filtration structure. The sewage that has not passed through the filtration structure is pumped to the sedimentation tank by a pumping device. The heating device heats the sewage, and the scraping device driven by the moving device scrapes away impurities that have settled on the heating device. S400, when large particles of solid impurities accumulate and block the grating separation structure, the sewage pipe is closed, the shielding extension structure is separated from the top of the grating separation structure, and the grating separation structure moves upward through the lifting device to separate from the first treatment tank to treat the large particles of solid impurities. Another lifting device drives the corresponding grating separation structure to another first treatment tank, and repeats the above steps to treat the sewage.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a grating separation structure to screen large solid impurities in the first treatment tank, so that the large solid impurities remain above the grating separation structure, and uses a shielding extension structure to close the gap between the grating separation structure and the inner wall of the first treatment tank, thereby avoiding sewage from directly passing over the grating separation structure without being treated, thereby avoiding affecting the sewage treatment effect. During the up and down movement of the grating separation structure, the shielding extension structure is located outside the movement path of the grating separation structure, avoiding interference with the movement of the grating separation structure, and the solid particulate impurities attached to the inner wall of the first treatment tank will not affect the movement of the grating separation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0016] Figure 1 A schematic structural diagram of a multi-stage sewage treatment device is provided for an embodiment of the present invention; Figure 2 A partial structural diagram of a multi-stage sewage treatment equipment is provided for an embodiment of the present invention; Figure 3 A schematic side cross-sectional view of a multi-stage sewage treatment device is provided for an embodiment of the present invention; Figure 4 A schematic diagram of a top-down cross-sectional structure of a multi-stage sewage treatment equipment is provided for an embodiment of the present invention; Figure 5 Provided for embodiments of the present invention Figure 3 A schematic diagram of the structure of part A shown in FIG; Figure 6 Provided for embodiments of the present invention Figure 4 A schematic diagram of the structure of part B shown in FIG; Figure 7 A schematic structural diagram of a grid plate is provided for an embodiment of the present invention; Figure 8 A structural schematic diagram of a shielding plate is provided for an embodiment of the present invention.

[0017] The numbers in the figure represent the following: 1. First treatment tank; 2. Second treatment tank; 3. Sedimentation tank; 4. Lifting device; 6. Grid separation structure; 7. Shielding extension structure; 8. Filtering structure; 10. Moving device; 11. Scraping structure; 401, gear; 402, tooth plate; 403, lifting slot; 404, sliding slot; 405, lifting bracket; 601, connecting rod; 602, grid plate; 603, positioning magnetic block; 604, slide bar; 605, movable slot; 701, winding assembly; 702, shielding plate; 703, winding slot; 704, spring; 705, stop bar; 706, isolation slot. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1:

[0019] like Figures 1 to 7 As shown, the present invention provides a multi-stage sewage treatment equipment, including two first treatment tanks 1, a second treatment tank 2 and a sedimentation tank 3, and the two first treatment tanks 1 are arranged in parallel and are connected to a sewage pipe, the two first treatment tanks 1 are connected to the bottom of the second treatment tank 2, and a pumping device is provided on the second treatment tank 2, which is used to pump the sewage in the second treatment tank 2 into the sedimentation tank 3, and a lifting device 4 is provided on the top of each first treatment tank 1, and each lifting device 4 is connected to a grid separation structure 6 for screening large particles of solid impurities, and when the grid separation structure 6 is located in the corresponding first treatment tank 1, there is a gap between the grid separation structure 6 and the inner wall of the first treatment tank 1, and a shielding extension structure 7 is provided on the inner side wall of each first treatment tank 1, and the shielding extension structure 7 is used to close the gap between the grid separation structure 6 and the inner wall of the first treatment tank 1, and move to the outside of the movement path of the grid separation structure 6 when the grid separation structure 6 moves up and down, and the two shielding extension structures 7 are arranged at different heights in the two first treatment tanks 1; A filtering structure 8 is provided in the second treatment tank 2, a heating device and a moving device 10 are provided in the sedimentation tank 3, a scraping structure 11 is provided on the moving device 10, and the scraping structure 11 is used to scrape off impurities precipitated and solidified on the heating device.

[0020] During use, sewage (potato starch sewage) is discharged into the corresponding first treatment tank 1 through one of the sewage pipes, and is treated by the grating separation structure 6 so that large particles of solid impurities in the sewage remain on the upper surface of the grating separation structure 6. The treated sewage enters the second treatment tank 2 from the bottom of the second treatment tank 2 and is treated for the second time by the filtering structure 8. The sewage that has been treated for the second time is located above the filtering structure 8, and the sewage that has been treated for the second time is pumped into the sedimentation tank 3 by a pumping device. After being heated by the heating device, the starch in the sewage is precipitated. At the same time, the scraping structure 11 is driven back and forth by the moving device 10 to scrape off the starch attached to the surface of the heating device, ensuring the cleanliness of the surface of the heating device and avoiding the problem of starch solidifying on the surface of the heating device 10 for a long time, which makes it difficult to remove in the later stage. Furthermore, this device can also be used for the treatment of other sewage. At this time, the scraping structure 11 is used to remove impurities precipitated on the surface of the heating device, and the heating device can be used as needed.

[0021] When a large number of large-particle solid impurities accumulate on the surface of the grating separation structure 6, it will affect the sewage treatment effect of the grating separation structure 6. At this time, the corresponding sewage pipe is closed, and the shielding extension structure 7 is moved outside the movement path of the grating separation structure 6 to avoid interference with the movement of the grating separation structure 6. Then the lifting device 4 drives the grating separation structure 6 to move upward to the top of the first treatment tank 1, and then the large-particle solid impurities on the grating separation structure 6 can be treated.

[0022] At the same time, another grating separation structure 6 is synchronously moved downward by the driving of the lifting device 4 until it enters the corresponding depth in the first treatment tank 1, and then the shielding extension structure 7 moves to above the gap between the grating separation structure 6 and the inner wall of the first treatment tank 1, and then the lifting device 4 drives the grating separation structure 6 to move upward until it is against the bottom of the shielding extension structure 7. At this time, the grating separation structure 6 and the shielding extension structure 7 jointly divide the first treatment tank 1 into two spaces, upper and lower, and then the corresponding sewage pipe is discharged into the sewage for treatment, so that the sewage treatment process is uninterrupted, thereby ensuring the sewage treatment effect.

[0023] There is also a gap between the grating separation structure 6 and the inner wall of the first treatment tank 1, so that the solid particles attached to the inner wall of the first treatment tank 1 pass through the gap between the grating separation structure 6 and the inner wall of the first treatment tank 1, avoiding the solid particle impurities attached to the inner wall of the first treatment tank 1 from interfering with the normal movement of the grating separation structure 6, and avoiding the sewage from passing through the gap between the grating separation structure 6 and the inner wall of the first treatment tank 1, thereby ensuring the treatment effect of the sewage.

[0024] In this embodiment, the filtering structure 8, the heating device, the moving device 10 and the scraping structure 11 are all existing technologies. For example, the filtering structure 8 is a rotatable filter plate, the heating device can be a flat heating element, the moving device 10 is a motor-driven screw to rotate, and the scraping structure 11 is a support frame connected to the scraper, and the support frame is set on the screw. Or the above filtering structure 8, heating device, moving device 10 and scraping structure 11 can also be other technical solutions to achieve the same function, such as referring to the corresponding structure in the invention patent with patent announcement number CN119118257B (the filtering mechanism corresponds to the filtering structure 8, the heating device corresponds to the heating device in this application, and the heating precipitation mechanism corresponds to the moving device 10 and scraping structure 11 in this application). The technical principles will not be elaborated on here.

[0025] The lifting device 4 includes a gear 401 rotatably installed at the top edge of the first treatment pool 1 through a support plate, the gear 401 is engaged with a tooth plate 402, a lifting groove 403 and a plurality of sliding grooves 404 are opened on the top of the first treatment pool 1, and the tooth plate 402 is slidably connected in the lifting groove 403, and the plurality of sliding grooves 404 are symmetrically arranged on the top of the first treatment pool 1 and are slidably connected to a lifting bracket 405, and the tooth plate 402 is fixedly connected to one side of the lifting bracket 405.

[0026] The gear 401 is driven to rotate by a driving device such as a motor, and the gear 401 drives the tooth plate 402 to slide along the lifting groove 403, so that the tooth plate 402 moves in the vertical direction, thereby driving the lifting bracket 405 to move up and down in the vertical direction, and then driving the grid separation structure 6 to move up and down.

[0027] The grid separation structure 6 includes a plurality of connecting rods 601 fixedly connected to the bottom of the lifting bracket 405. The plurality of connecting rods 601 are divided into two groups and are symmetrical about the center plane of the vertical direction of the first treatment tank 1, and each group of connecting rods 601 is arranged along a horizontal straight line. The bottoms of the two groups of connecting rods 601 are movably connected to a grid 602 for separating large-particle solid impurities, and the peripheral sides of the grid 602 are respectively parallel to the multiple vertical side walls in the first treatment tank 1. Two positioning magnetic blocks 603 are symmetrically arranged on the grid 602, and the two positioning magnetic blocks 603 are respectively attracted to one of the two groups of connecting rods 601 through magnetic force to limit the position of the grid 602.

[0028] When the lifting bracket 405 moves up and down, it drives multiple connecting rods 601 to move up and down synchronously, thereby driving the grid plate 602 to move up and down, so that the grid plate 602 enters or leaves the first treatment tank 1, and the two positioning magnetic blocks 603 are attracted to the corresponding connecting rods 601 to limit the movement of the grid plate 602, and the positioning magnetic blocks 603 are offset against the corresponding connecting rods 601 to achieve the positioning of the grid plate 602, so that each time the grid plate 602 is installed, it is located at the same position below the lifting bracket 405, thereby ensuring that the grid plate 602 can accurately enter the first treatment tank 1 to treat the sewage.

[0029] The two positioning magnetic blocks 603 are both located on the same side of the two sets of connecting rods 601 to avoid interference with the movement of the grid plate 602 separating from the connecting rods 601 .

[0030] Two slide bars 604 are symmetrically arranged on the grid plate 602, and movable grooves 605 are opened on the opposite sides of the two groups of connecting rods 601. Each slide bar 604 is slidably connected to the movable groove 605 on one group of connecting rods 601, and two positioning magnetic blocks 603 are respectively arranged on the top of the two slide bars 604 and are respectively attracted to the outermost side of each group of connecting rods 601.

[0031] After the two slide bars 604 are inserted into the corresponding movable grooves 605, the grating 602 can only be moved and disassembled along the direction of arrangement of each group of connecting rods 602, so as to limit the movement of the grating 602 in the direction perpendicular to the arrangement of each group of connecting rods 602. Then the positioning magnetic block 603 is attracted to the outermost connecting rod 601 through magnetic force, which can not only limit the movement of the grating 602 along the direction of arrangement of each group of connecting rods 601, but also position the position of the grating 602, so that the grating 602 is located in the same position each time it is installed on multiple connecting rods 602, so that the grating 602 can accurately enter the first treatment tank 1 for sewage treatment.

[0032] After the grid plate 602 moves to the top of the first treatment tank 1, a force can be applied to the grid plate 602 in the horizontal direction to disconnect the positioning magnetic block 603 from the connecting rod 601, thereby processing the large particles of solid impurities accumulated on the grid plate 602. The application of external force can be manual or mechanical, such as a linear mechanism that can move in the horizontal direction to push the grid plate 602.

[0033] In this embodiment, the grid plate 602 is a plate body that can filter large particles of solid impurities, such as the movable grid in the invention patent with patent publication number CN119118257B.

[0034] The upper surface of the grid plate 602 is wavy, which increases the contact area between the grid plate 602 and the sewage, improves the sewage treatment efficiency and treatment effect, and the wavy depression can prevent large particles of solid impurities from escaping the grid plate 602 when the grid plate 602 is separated from the connecting rod 601.

[0035] The shielding extension structure 7 includes a plurality of winding assemblies 701 and a plurality of shielding plates 702 of the same height, and each winding assembly 701 is connected to the corresponding shielding plate 702 by a connecting rope. The plurality of side walls in the first treatment tank 1 are provided with winding grooves 703, and the plurality of winding assemblies 701 are respectively arranged in the corresponding winding grooves 703. The plurality of shielding plates 702 are respectively slidably and sealedly connected to the notches of the winding grooves 703 and can slide horizontally along the notches of the winding grooves 703 to extend into the interior of the first treatment tank 1. A spring 704 connected to the inner wall of the winding groove 703 is connected to the side of each shielding plate 702 facing away from the interior of the first treatment tank 1. Among them, after extending into the first treatment tank 1, the multiple shielding plates 702 are located above the gap between the grid plate 602 and the inner wall of the first treatment tank 1, and the parts of the multiple shielding plates 702 located in the first treatment tank 1 form an annular plate.

[0036] After the grid plate 602 enters the first treatment tank 1, the winding assembly 701 releases the connecting rope, and the shielding plate 702 moves toward the outside of the winding groove 703 under the elastic force of the spring 704 until the shielding plate 702 moves to the top of the gap between the grid plate 602 and the inner wall of the first treatment tank 1. Then, the lifting device 4 drives the grid plate 602 to move upward until it contacts the bottom of the multiple shielding plates 702. Since one end of the multiple shielding plates 702 forms a complete annular plate after moving to the inside of the first treatment tank 1, The parts of the multiple shielding plates 702 extending into the first treatment tank 1 can block the sewage, and the grating 602 is in contact with the bottom of the multiple shielding plates 702. At the same time, the shielding plates 702 are slidably and sealedly connected with the winding groove 703, so that the sewage can only enter the bottom of the grating 602 through the grating 602, thereby ensuring the treatment effect of the sewage. In addition, since there is a gap between the grating 602 and the inner wall of the first treatment tank 1, the solid particle impurities attached to the inner wall of the first treatment tank 1 are prevented from affecting the movement of the grating 602.

[0037] When one end of the shielding plate 702 moves into the first treatment tank 1 , the other end of the shielding plate 702 is located in the winding groove 703 , and the spring 704 is in a compressed state, while the connecting rope is in a taut state, thereby fixing the position of the shielding plate 702 .

[0038] The winding assembly 701 winds up the connecting rope, causing the shielding plate 702 to move toward the inside of the winding slot 703, and the spring 704 is further compressed until the shielding plate 702 is separated from the top of the grid plate 602. The solid impurities attached to the surface of the shielding plate 702 can be scraped off through the notch of the winding slot 703, so that the shielding plate 702 can move normally.

[0039] In this embodiment, the winding component 701 is a conventional technology, such as a motor-driven roller to wind up the connecting rope, and a rotating roller to control the connecting rope to move horizontally, or other technical solutions are also possible, and the technical principles will not be elaborated on in detail.

[0040] Furthermore, the top of the shielding plate 702 is an inclined surface so that solid particle impurities can slide off the shielding plate 702 .

[0041] In this embodiment, due to the long length of the shielding plate 702, the winding groove 703 is connected to the lifting groove 403, but due to the wall thickness of the first treatment tank 1, the shielding plate 702 slides along the connection between the winding groove 703 and the inner wall of the first treatment tank 1, that is, the groove. When the shielding plate 702 extends or retracts along the groove of the winding groove 703, the shielding plate 702 will not interfere with the tooth plate 402.

[0042] A blocking bar 705 is provided at the bottom of the shielding plate 702 , and a plurality of isolation grooves 706 are provided on the grid plate 602 to cooperate with the blocking bars 705 . When the blocking bars 705 contact each other, an annular bar is formed.

[0043] When the blocking bar 705 is inserted into the corresponding isolation groove 706 , the cooperation between the blocking bar 705 and the isolation groove 706 can further limit the sewage from seeping out from between the shielding plate 703 and the grid plate 602 to the bottom of the grid plate 602 .

[0044] When in use, the grid plate 602 first moves to a position lower than the shielding plate 703. When the shielding plate 703 moves to above the gap between the grid plate 602 and the inner wall of the first treatment tank 1, the lifting device 4 drives the grid plate 602 upward to the blocking bar 705 and enters the corresponding isolation groove 706. Example 2:

[0045] The present invention also provides a treatment process of a multi-stage sewage treatment equipment, the specific steps of which include: At step S100 , one of the lifting devices 4 transports the grid separation structure 6 into the first treatment tank 1 , and then the shielding extension structure 7 extends into the first treatment tank 1 . The lifting device 4 then controls the grid separation structure 6 to move upward until it contacts the bottom of the shielding extension structure 7 . S200: Sewage is fed into the corresponding first treatment tank 1 through the sewage pipe, and is separated from large solid impurities by the grid separation structure 6. After the first treatment, the sewage enters the second treatment tank 2; At step S300, the sewage in the second treatment tank 2 gradually rises and passes through the filter structure 8. The sewage that has not passed through the filter structure 8 is pumped into the sedimentation tank 3 by the pumping device. The heating device heats the sewage, and the scraping device 11 driven by the moving device 10 scrapes away impurities precipitated and solidified on the heating device. S400, when large particles of solid impurities accumulate and block the grid separation structure 6, the sewage pipe is closed, and the shielding extension structure 7 is separated from the top of the grid separation structure 6. The grid separation structure 6 moves upward through the lifting device 4 to separate from the first treatment tank 1 to treat the large particles of solid impurities. Another lifting device 4 drives the corresponding grid separation structure 6 to another first treatment tank 1, and repeats the sewage treatment according to the above steps.

[0046] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A multi-stage sewage treatment equipment, comprising two first treatment tanks (1), a second treatment tank (2) and a sedimentation tank (3), wherein the two first treatment tanks (1) are arranged in parallel and are both connected to a sewage pipe, the two first treatment tanks (1) are both connected to the bottom of the second treatment tank (2), and the second treatment tank (2) is provided with a pumping device, the pumping device is used to pump the sewage in the second treatment tank (2) to the sedimentation tank (3), characterized in that: A lifting device (4) is provided on the top of each first treatment tank (1), and each lifting device (4) is connected to a grid separation structure (6) for screening large-particle solid impurities, and when the grid separation structure (6) is located in the corresponding first treatment tank (1), there is a gap between the grid separation structure (6) and the inner wall of the first treatment tank (1), and a shielding extension structure (7) is provided on the inner side wall of each first treatment tank (1), and the shielding extension structure (7) is used to close the gap between the grid separation structure (6) and the inner wall of the first treatment tank (1), and moves to the outside of the movement path of the grid separation structure (6) when the grid separation structure (6) moves up and down, and the two shielding extension structures (7) are set at different heights in the two first treatment tanks (1); A filtering structure (8) is provided in the second treatment tank (2), a heating device and a moving device (10) are provided in the sedimentation tank (3), a scraping structure (11) is provided on the moving device (10), and the scraping structure (11) is used to scrape off impurities precipitated and solidified on the heating device.

2. A multi-stage sewage treatment equipment according to claim 1, characterized in that: The lifting device (4) includes a gear (401) rotatably mounted on the top edge of the first treatment tank (1) through a support plate, the gear (401) is meshed with a tooth plate (402), a lifting groove (403) and a plurality of sliding grooves (404) are provided on the top of the first treatment tank (1), and the tooth plate (402) is slidably connected to the lifting groove (403), the plurality of sliding grooves (404) are symmetrically arranged on the top of the first treatment tank (1) and are slidably connected to a lifting bracket (405) together, and the tooth plate (402) is fixedly connected to one side of the lifting bracket (405).

3. A multi-stage sewage treatment equipment according to claim 2, characterized in that: The grid separation structure (6) includes a plurality of connecting rods (601) fixedly connected to the bottom of the lifting bracket (405), the plurality of connecting rods (601) are divided into two groups and are symmetrical about the center plane of the vertical direction of the first treatment tank (1), and each group of connecting rods (601) are arranged along a horizontal straight line, the bottoms of the two groups of connecting rods (601) are movably connected to a grid plate (602) for separating large particles of solid impurities, and the peripheral sides of the grid plate (602) are respectively parallel to the plurality of vertical side walls in the first treatment tank (1), and two positioning magnetic blocks (603) are symmetrically arranged on the grid plate (602), and the two positioning magnetic blocks (603) are respectively attracted to one of the two groups of connecting rods (601) by magnetic force to limit the position of the grid plate (602).

4. A multi-stage sewage treatment equipment according to claim 3, characterized in that: Two slide bars (604) are symmetrically arranged on the grid plate (602), and movable grooves (605) are opened on the opposite sides of the two groups of connecting rods (601). Each of the slide bars (604) is slidably connected to the movable groove (605) on one group of connecting rods (601). The two positioning magnetic blocks (603) are respectively arranged on the top of the two slide bars (604) and are respectively attracted to the outermost side of each group of connecting rods (601).

5. The multi-stage sewage treatment equipment according to claim 3, characterized in that: The upper surface of the grid plate (602) is wavy.

6. The multi-stage sewage treatment equipment according to claim 3, characterized in that: The shielding extension structure (7) includes a plurality of winding components (701) and a plurality of shielding plates (702) of the same height, and each of the winding components (701) is connected to the corresponding shielding plate (702) via a connecting rope, a plurality of side walls in the first treatment tank (1) are provided with winding grooves (703), and the plurality of winding components (701) are respectively arranged in the corresponding winding grooves (703), and the plurality of shielding plates (702) are respectively slidably and sealedly connected to the notches of the winding grooves (703), and can slide horizontally along the notches of the winding grooves (703) to extend into the interior of the first treatment tank (1), and a spring (704) connected to the inner wall of the winding groove (703) is connected to each of the shielding plates (702) on a side facing away from the interior of the first treatment tank (1); The plurality of shielding plates (702) are positioned above the gap between the grid plate (602) and the inner wall of the first treatment tank (1) after extending into the interior of the first treatment tank (1), and the portions of the plurality of shielding plates (702) located within the first treatment tank (1) form an annular plate.

7. The multi-stage sewage treatment equipment according to claim 6, characterized in that: The bottom of the shielding plate (702) is provided with a blocking bar (705), and the grid plate (602) is provided with a plurality of isolation grooves (706) that cooperate with the plurality of blocking bars (705). When the plurality of blocking bars (705) contact each other, an annular bar is formed.

8. A treatment process applied to the multi-stage sewage treatment equipment according to any one of claims 1 to 7, characterized in that: The specific steps include: S100, one of the lifting devices (4) transports the grid separation structure (6) into the first treatment tank (1), and then the shielding extension structure (7) extends into the first treatment tank (1), and then the lifting device (4) controls the grid separation structure (6) to move upward until it contacts the bottom of the shielding extension structure (7); S200, sewage is input into the corresponding first treatment tank (1) through the sewage pipe, and is separated from large particles of solid impurities by the grid separation structure (6). After the first treatment, the sewage enters the second treatment tank (2); S300, the sewage in the second treatment tank (2) gradually rises and passes through the filter structure (8), and the sewage that does not pass through the filter structure (8) is pumped into the sedimentation tank (3) by the pumping device, the heating device heats the sewage, and the scraping structure (11) is driven by the moving device (10) to scrape off the impurities precipitated and solidified on the heating device; S400, when large particles of solid impurities accumulate and block the grid separation structure (6), the sewage pipe is closed, the shielding extension structure (7) is separated from the top of the grid separation structure (6), and the grid separation structure (6) moves upward through the lifting device (4) to separate from the first treatment tank (1) to treat the large particles of solid impurities, and another lifting device (4) drives the corresponding grid separation structure (6) to another first treatment tank (1), and the sewage treatment is repeated according to the above steps.

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